The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netipsec/key.c

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    1 /*      $FreeBSD: head/sys/netipsec/key.c 279234 2015-02-24 10:35:07Z ae $      */
    2 /*      $KAME: key.c,v 1.191 2001/06/27 10:46:49 sakane Exp $   */
    3 
    4 /*-
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 /*
   34  * This code is referd to RFC 2367
   35  */
   36 
   37 #include "opt_inet.h"
   38 #include "opt_inet6.h"
   39 #include "opt_ipsec.h"
   40 
   41 #include <sys/types.h>
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/kernel.h>
   45 #include <sys/lock.h>
   46 #include <sys/mutex.h>
   47 #include <sys/mbuf.h>
   48 #include <sys/domain.h>
   49 #include <sys/protosw.h>
   50 #include <sys/malloc.h>
   51 #include <sys/rmlock.h>
   52 #include <sys/socket.h>
   53 #include <sys/socketvar.h>
   54 #include <sys/sysctl.h>
   55 #include <sys/errno.h>
   56 #include <sys/proc.h>
   57 #include <sys/queue.h>
   58 #include <sys/refcount.h>
   59 #include <sys/syslog.h>
   60 
   61 #include <net/if.h>
   62 #include <net/if_var.h>
   63 #include <net/vnet.h>
   64 #include <net/raw_cb.h>
   65 
   66 #include <netinet/in.h>
   67 #include <netinet/in_systm.h>
   68 #include <netinet/ip.h>
   69 #include <netinet/in_var.h>
   70 
   71 #ifdef INET6
   72 #include <netinet/ip6.h>
   73 #include <netinet6/in6_var.h>
   74 #include <netinet6/ip6_var.h>
   75 #endif /* INET6 */
   76 
   77 #if defined(INET) || defined(INET6)
   78 #include <netinet/in_pcb.h>
   79 #endif
   80 #ifdef INET6
   81 #include <netinet6/in6_pcb.h>
   82 #endif /* INET6 */
   83 
   84 #include <net/pfkeyv2.h>
   85 #include <netipsec/keydb.h>
   86 #include <netipsec/key.h>
   87 #include <netipsec/keysock.h>
   88 #include <netipsec/key_debug.h>
   89 
   90 #include <netipsec/ipsec.h>
   91 #ifdef INET6
   92 #include <netipsec/ipsec6.h>
   93 #endif
   94 
   95 #include <netipsec/xform.h>
   96 
   97 #include <machine/stdarg.h>
   98 
   99 /* randomness */
  100 #include <sys/random.h>
  101 
  102 #define FULLMASK        0xff
  103 #define _BITS(bytes)    ((bytes) << 3)
  104 
  105 /*
  106  * Note on SA reference counting:
  107  * - SAs that are not in DEAD state will have (total external reference + 1)
  108  *   following value in reference count field.  they cannot be freed and are
  109  *   referenced from SA header.
  110  * - SAs that are in DEAD state will have (total external reference)
  111  *   in reference count field.  they are ready to be freed.  reference from
  112  *   SA header will be removed in key_delsav(), when the reference count
  113  *   field hits 0 (= no external reference other than from SA header.
  114  */
  115 
  116 VNET_DEFINE(u_int32_t, key_debug_level) = 0;
  117 static VNET_DEFINE(u_int, key_spi_trycnt) = 1000;
  118 static VNET_DEFINE(u_int32_t, key_spi_minval) = 0x100;
  119 static VNET_DEFINE(u_int32_t, key_spi_maxval) = 0x0fffffff;     /* XXX */
  120 static VNET_DEFINE(u_int32_t, policy_id) = 0;
  121 /*interval to initialize randseed,1(m)*/
  122 static VNET_DEFINE(u_int, key_int_random) = 60;
  123 /* interval to expire acquiring, 30(s)*/
  124 static VNET_DEFINE(u_int, key_larval_lifetime) = 30;
  125 /* counter for blocking SADB_ACQUIRE.*/
  126 static VNET_DEFINE(int, key_blockacq_count) = 10;
  127 /* lifetime for blocking SADB_ACQUIRE.*/
  128 static VNET_DEFINE(int, key_blockacq_lifetime) = 20;
  129 /* preferred old sa rather than new sa.*/
  130 static VNET_DEFINE(int, key_preferred_oldsa) = 1;
  131 #define V_key_spi_trycnt        VNET(key_spi_trycnt)
  132 #define V_key_spi_minval        VNET(key_spi_minval)
  133 #define V_key_spi_maxval        VNET(key_spi_maxval)
  134 #define V_policy_id             VNET(policy_id)
  135 #define V_key_int_random        VNET(key_int_random)
  136 #define V_key_larval_lifetime   VNET(key_larval_lifetime)
  137 #define V_key_blockacq_count    VNET(key_blockacq_count)
  138 #define V_key_blockacq_lifetime VNET(key_blockacq_lifetime)
  139 #define V_key_preferred_oldsa   VNET(key_preferred_oldsa)
  140 
  141 static VNET_DEFINE(u_int32_t, acq_seq) = 0;
  142 #define V_acq_seq               VNET(acq_seq)
  143 
  144                                                                 /* SPD */
  145 static VNET_DEFINE(TAILQ_HEAD(_sptree, secpolicy), sptree[IPSEC_DIR_MAX]);
  146 static struct rmlock sptree_lock;
  147 #define V_sptree                VNET(sptree)
  148 #define SPTREE_LOCK_INIT()      rm_init(&sptree_lock, "sptree")
  149 #define SPTREE_LOCK_DESTROY()   rm_destroy(&sptree_lock)
  150 #define SPTREE_RLOCK_TRACKER    struct rm_priotracker sptree_tracker
  151 #define SPTREE_RLOCK()          rm_rlock(&sptree_lock, &sptree_tracker)
  152 #define SPTREE_RUNLOCK()        rm_runlock(&sptree_lock, &sptree_tracker)
  153 #define SPTREE_RLOCK_ASSERT()   rm_assert(&sptree_lock, RA_RLOCKED)
  154 #define SPTREE_WLOCK()          rm_wlock(&sptree_lock)
  155 #define SPTREE_WUNLOCK()        rm_wunlock(&sptree_lock)
  156 #define SPTREE_WLOCK_ASSERT()   rm_assert(&sptree_lock, RA_WLOCKED)
  157 #define SPTREE_UNLOCK_ASSERT()  rm_assert(&sptree_lock, RA_UNLOCKED)
  158 
  159 static VNET_DEFINE(LIST_HEAD(_sahtree, secashead), sahtree);    /* SAD */
  160 #define V_sahtree               VNET(sahtree)
  161 static struct mtx sahtree_lock;
  162 #define SAHTREE_LOCK_INIT() \
  163         mtx_init(&sahtree_lock, "sahtree", \
  164                 "fast ipsec security association database", MTX_DEF)
  165 #define SAHTREE_LOCK_DESTROY()  mtx_destroy(&sahtree_lock)
  166 #define SAHTREE_LOCK()          mtx_lock(&sahtree_lock)
  167 #define SAHTREE_UNLOCK()        mtx_unlock(&sahtree_lock)
  168 #define SAHTREE_LOCK_ASSERT()   mtx_assert(&sahtree_lock, MA_OWNED)
  169 
  170                                                         /* registed list */
  171 static VNET_DEFINE(LIST_HEAD(_regtree, secreg), regtree[SADB_SATYPE_MAX + 1]);
  172 #define V_regtree               VNET(regtree)
  173 static struct mtx regtree_lock;
  174 #define REGTREE_LOCK_INIT() \
  175         mtx_init(&regtree_lock, "regtree", "fast ipsec regtree", MTX_DEF)
  176 #define REGTREE_LOCK_DESTROY()  mtx_destroy(&regtree_lock)
  177 #define REGTREE_LOCK()          mtx_lock(&regtree_lock)
  178 #define REGTREE_UNLOCK()        mtx_unlock(&regtree_lock)
  179 #define REGTREE_LOCK_ASSERT()   mtx_assert(&regtree_lock, MA_OWNED)
  180 
  181 static VNET_DEFINE(LIST_HEAD(_acqtree, secacq), acqtree); /* acquiring list */
  182 #define V_acqtree               VNET(acqtree)
  183 static struct mtx acq_lock;
  184 #define ACQ_LOCK_INIT() \
  185         mtx_init(&acq_lock, "acqtree", "fast ipsec acquire list", MTX_DEF)
  186 #define ACQ_LOCK_DESTROY()      mtx_destroy(&acq_lock)
  187 #define ACQ_LOCK()              mtx_lock(&acq_lock)
  188 #define ACQ_UNLOCK()            mtx_unlock(&acq_lock)
  189 #define ACQ_LOCK_ASSERT()       mtx_assert(&acq_lock, MA_OWNED)
  190 
  191                                                         /* SP acquiring list */
  192 static VNET_DEFINE(LIST_HEAD(_spacqtree, secspacq), spacqtree);
  193 #define V_spacqtree             VNET(spacqtree)
  194 static struct mtx spacq_lock;
  195 #define SPACQ_LOCK_INIT() \
  196         mtx_init(&spacq_lock, "spacqtree", \
  197                 "fast ipsec security policy acquire list", MTX_DEF)
  198 #define SPACQ_LOCK_DESTROY()    mtx_destroy(&spacq_lock)
  199 #define SPACQ_LOCK()            mtx_lock(&spacq_lock)
  200 #define SPACQ_UNLOCK()          mtx_unlock(&spacq_lock)
  201 #define SPACQ_LOCK_ASSERT()     mtx_assert(&spacq_lock, MA_OWNED)
  202 
  203 /* search order for SAs */
  204 static const u_int saorder_state_valid_prefer_old[] = {
  205         SADB_SASTATE_DYING, SADB_SASTATE_MATURE,
  206 };
  207 static const u_int saorder_state_valid_prefer_new[] = {
  208         SADB_SASTATE_MATURE, SADB_SASTATE_DYING,
  209 };
  210 static const u_int saorder_state_alive[] = {
  211         /* except DEAD */
  212         SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL
  213 };
  214 static const u_int saorder_state_any[] = {
  215         SADB_SASTATE_MATURE, SADB_SASTATE_DYING,
  216         SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD
  217 };
  218 
  219 static const int minsize[] = {
  220         sizeof(struct sadb_msg),        /* SADB_EXT_RESERVED */
  221         sizeof(struct sadb_sa),         /* SADB_EXT_SA */
  222         sizeof(struct sadb_lifetime),   /* SADB_EXT_LIFETIME_CURRENT */
  223         sizeof(struct sadb_lifetime),   /* SADB_EXT_LIFETIME_HARD */
  224         sizeof(struct sadb_lifetime),   /* SADB_EXT_LIFETIME_SOFT */
  225         sizeof(struct sadb_address),    /* SADB_EXT_ADDRESS_SRC */
  226         sizeof(struct sadb_address),    /* SADB_EXT_ADDRESS_DST */
  227         sizeof(struct sadb_address),    /* SADB_EXT_ADDRESS_PROXY */
  228         sizeof(struct sadb_key),        /* SADB_EXT_KEY_AUTH */
  229         sizeof(struct sadb_key),        /* SADB_EXT_KEY_ENCRYPT */
  230         sizeof(struct sadb_ident),      /* SADB_EXT_IDENTITY_SRC */
  231         sizeof(struct sadb_ident),      /* SADB_EXT_IDENTITY_DST */
  232         sizeof(struct sadb_sens),       /* SADB_EXT_SENSITIVITY */
  233         sizeof(struct sadb_prop),       /* SADB_EXT_PROPOSAL */
  234         sizeof(struct sadb_supported),  /* SADB_EXT_SUPPORTED_AUTH */
  235         sizeof(struct sadb_supported),  /* SADB_EXT_SUPPORTED_ENCRYPT */
  236         sizeof(struct sadb_spirange),   /* SADB_EXT_SPIRANGE */
  237         0,                              /* SADB_X_EXT_KMPRIVATE */
  238         sizeof(struct sadb_x_policy),   /* SADB_X_EXT_POLICY */
  239         sizeof(struct sadb_x_sa2),      /* SADB_X_SA2 */
  240         sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */
  241         sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */
  242         sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */
  243         sizeof(struct sadb_address),    /* SADB_X_EXT_NAT_T_OAI */
  244         sizeof(struct sadb_address),    /* SADB_X_EXT_NAT_T_OAR */
  245         sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */
  246 };
  247 static const int maxsize[] = {
  248         sizeof(struct sadb_msg),        /* SADB_EXT_RESERVED */
  249         sizeof(struct sadb_sa),         /* SADB_EXT_SA */
  250         sizeof(struct sadb_lifetime),   /* SADB_EXT_LIFETIME_CURRENT */
  251         sizeof(struct sadb_lifetime),   /* SADB_EXT_LIFETIME_HARD */
  252         sizeof(struct sadb_lifetime),   /* SADB_EXT_LIFETIME_SOFT */
  253         0,                              /* SADB_EXT_ADDRESS_SRC */
  254         0,                              /* SADB_EXT_ADDRESS_DST */
  255         0,                              /* SADB_EXT_ADDRESS_PROXY */
  256         0,                              /* SADB_EXT_KEY_AUTH */
  257         0,                              /* SADB_EXT_KEY_ENCRYPT */
  258         0,                              /* SADB_EXT_IDENTITY_SRC */
  259         0,                              /* SADB_EXT_IDENTITY_DST */
  260         0,                              /* SADB_EXT_SENSITIVITY */
  261         0,                              /* SADB_EXT_PROPOSAL */
  262         0,                              /* SADB_EXT_SUPPORTED_AUTH */
  263         0,                              /* SADB_EXT_SUPPORTED_ENCRYPT */
  264         sizeof(struct sadb_spirange),   /* SADB_EXT_SPIRANGE */
  265         0,                              /* SADB_X_EXT_KMPRIVATE */
  266         0,                              /* SADB_X_EXT_POLICY */
  267         sizeof(struct sadb_x_sa2),      /* SADB_X_SA2 */
  268         sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */
  269         sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */
  270         sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */
  271         0,                              /* SADB_X_EXT_NAT_T_OAI */
  272         0,                              /* SADB_X_EXT_NAT_T_OAR */
  273         sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */
  274 };
  275 
  276 static VNET_DEFINE(int, ipsec_esp_keymin) = 256;
  277 static VNET_DEFINE(int, ipsec_esp_auth) = 0;
  278 static VNET_DEFINE(int, ipsec_ah_keymin) = 128;
  279 
  280 #define V_ipsec_esp_keymin      VNET(ipsec_esp_keymin)
  281 #define V_ipsec_esp_auth        VNET(ipsec_esp_auth)
  282 #define V_ipsec_ah_keymin       VNET(ipsec_ah_keymin)
  283 
  284 #ifdef SYSCTL_DECL
  285 SYSCTL_DECL(_net_key);
  286 #endif
  287 
  288 SYSCTL_INT(_net_key, KEYCTL_DEBUG_LEVEL,        debug,
  289         CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_debug_level), 0, "");
  290 
  291 /* max count of trial for the decision of spi value */
  292 SYSCTL_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt,
  293         CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_trycnt), 0, "");
  294 
  295 /* minimum spi value to allocate automatically. */
  296 SYSCTL_INT(_net_key, KEYCTL_SPI_MIN_VALUE, spi_minval,
  297         CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_minval), 0, "");
  298 
  299 /* maximun spi value to allocate automatically. */
  300 SYSCTL_INT(_net_key, KEYCTL_SPI_MAX_VALUE, spi_maxval,
  301         CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_maxval), 0, "");
  302 
  303 /* interval to initialize randseed */
  304 SYSCTL_INT(_net_key, KEYCTL_RANDOM_INT, int_random,
  305         CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_int_random), 0, "");
  306 
  307 /* lifetime for larval SA */
  308 SYSCTL_INT(_net_key, KEYCTL_LARVAL_LIFETIME, larval_lifetime,
  309         CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_larval_lifetime), 0, "");
  310 
  311 /* counter for blocking to send SADB_ACQUIRE to IKEd */
  312 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, blockacq_count,
  313         CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_blockacq_count), 0, "");
  314 
  315 /* lifetime for blocking to send SADB_ACQUIRE to IKEd */
  316 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, blockacq_lifetime,
  317         CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_blockacq_lifetime), 0, "");
  318 
  319 /* ESP auth */
  320 SYSCTL_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth,
  321         CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_esp_auth), 0, "");
  322 
  323 /* minimum ESP key length */
  324 SYSCTL_INT(_net_key, KEYCTL_ESP_KEYMIN, esp_keymin,
  325         CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_esp_keymin), 0, "");
  326 
  327 /* minimum AH key length */
  328 SYSCTL_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin,
  329         CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_ah_keymin), 0, "");
  330 
  331 /* perfered old SA rather than new SA */
  332 SYSCTL_INT(_net_key, KEYCTL_PREFERED_OLDSA, preferred_oldsa,
  333         CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_preferred_oldsa), 0, "");
  334 
  335 #define __LIST_CHAINED(elm) \
  336         (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL))
  337 #define LIST_INSERT_TAIL(head, elm, type, field) \
  338 do {\
  339         struct type *curelm = LIST_FIRST(head); \
  340         if (curelm == NULL) {\
  341                 LIST_INSERT_HEAD(head, elm, field); \
  342         } else { \
  343                 while (LIST_NEXT(curelm, field)) \
  344                         curelm = LIST_NEXT(curelm, field);\
  345                 LIST_INSERT_AFTER(curelm, elm, field);\
  346         }\
  347 } while (0)
  348 
  349 #define KEY_CHKSASTATE(head, sav, name) \
  350 do { \
  351         if ((head) != (sav)) {                                          \
  352                 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \
  353                         (name), (head), (sav)));                        \
  354                 continue;                                               \
  355         }                                                               \
  356 } while (0)
  357 
  358 #define KEY_CHKSPDIR(head, sp, name) \
  359 do { \
  360         if ((head) != (sp)) {                                           \
  361                 ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \
  362                         "anyway continue.\n",                           \
  363                         (name), (head), (sp)));                         \
  364         }                                                               \
  365 } while (0)
  366 
  367 MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association");
  368 MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head");
  369 MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy");
  370 MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request");
  371 MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous");
  372 MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire");
  373 MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire");
  374 
  375 /*
  376  * set parameters into secpolicyindex buffer.
  377  * Must allocate secpolicyindex buffer passed to this function.
  378  */
  379 #define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \
  380 do { \
  381         bzero((idx), sizeof(struct secpolicyindex));                         \
  382         (idx)->dir = (_dir);                                                 \
  383         (idx)->prefs = (ps);                                                 \
  384         (idx)->prefd = (pd);                                                 \
  385         (idx)->ul_proto = (ulp);                                             \
  386         bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len);     \
  387         bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len);     \
  388 } while (0)
  389 
  390 /*
  391  * set parameters into secasindex buffer.
  392  * Must allocate secasindex buffer before calling this function.
  393  */
  394 #define KEY_SETSECASIDX(p, m, r, s, d, idx) \
  395 do { \
  396         bzero((idx), sizeof(struct secasindex));                             \
  397         (idx)->proto = (p);                                                  \
  398         (idx)->mode = (m);                                                   \
  399         (idx)->reqid = (r);                                                  \
  400         bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len);     \
  401         bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len);     \
  402 } while (0)
  403 
  404 /* key statistics */
  405 struct _keystat {
  406         u_long getspi_count; /* the avarage of count to try to get new SPI */
  407 } keystat;
  408 
  409 struct sadb_msghdr {
  410         struct sadb_msg *msg;
  411         struct sadb_ext *ext[SADB_EXT_MAX + 1];
  412         int extoff[SADB_EXT_MAX + 1];
  413         int extlen[SADB_EXT_MAX + 1];
  414 };
  415 
  416 #ifndef IPSEC_DEBUG2
  417 static struct callout key_timer;
  418 #endif
  419 
  420 static struct secasvar *key_allocsa_policy(const struct secasindex *);
  421 static void key_freesp_so(struct secpolicy **);
  422 static struct secasvar *key_do_allocsa_policy(struct secashead *, u_int);
  423 static void key_unlink(struct secpolicy *);
  424 static struct secpolicy *key_getsp(struct secpolicyindex *);
  425 static struct secpolicy *key_getspbyid(u_int32_t);
  426 static u_int32_t key_newreqid(void);
  427 static struct mbuf *key_gather_mbuf(struct mbuf *,
  428         const struct sadb_msghdr *, int, int, ...);
  429 static int key_spdadd(struct socket *, struct mbuf *,
  430         const struct sadb_msghdr *);
  431 static u_int32_t key_getnewspid(void);
  432 static int key_spddelete(struct socket *, struct mbuf *,
  433         const struct sadb_msghdr *);
  434 static int key_spddelete2(struct socket *, struct mbuf *,
  435         const struct sadb_msghdr *);
  436 static int key_spdget(struct socket *, struct mbuf *,
  437         const struct sadb_msghdr *);
  438 static int key_spdflush(struct socket *, struct mbuf *,
  439         const struct sadb_msghdr *);
  440 static int key_spddump(struct socket *, struct mbuf *,
  441         const struct sadb_msghdr *);
  442 static struct mbuf *key_setdumpsp(struct secpolicy *,
  443         u_int8_t, u_int32_t, u_int32_t);
  444 static u_int key_getspreqmsglen(struct secpolicy *);
  445 static int key_spdexpire(struct secpolicy *);
  446 static struct secashead *key_newsah(struct secasindex *);
  447 static void key_delsah(struct secashead *);
  448 static struct secasvar *key_newsav(struct mbuf *,
  449         const struct sadb_msghdr *, struct secashead *, int *,
  450         const char*, int);
  451 #define KEY_NEWSAV(m, sadb, sah, e)                             \
  452         key_newsav(m, sadb, sah, e, __FILE__, __LINE__)
  453 static void key_delsav(struct secasvar *);
  454 static struct secashead *key_getsah(struct secasindex *);
  455 static struct secasvar *key_checkspidup(struct secasindex *, u_int32_t);
  456 static struct secasvar *key_getsavbyspi(struct secashead *, u_int32_t);
  457 static int key_setsaval(struct secasvar *, struct mbuf *,
  458         const struct sadb_msghdr *);
  459 static int key_mature(struct secasvar *);
  460 static struct mbuf *key_setdumpsa(struct secasvar *, u_int8_t,
  461         u_int8_t, u_int32_t, u_int32_t);
  462 static struct mbuf *key_setsadbmsg(u_int8_t, u_int16_t, u_int8_t,
  463         u_int32_t, pid_t, u_int16_t);
  464 static struct mbuf *key_setsadbsa(struct secasvar *);
  465 static struct mbuf *key_setsadbaddr(u_int16_t,
  466         const struct sockaddr *, u_int8_t, u_int16_t);
  467 #ifdef IPSEC_NAT_T
  468 static struct mbuf *key_setsadbxport(u_int16_t, u_int16_t);
  469 static struct mbuf *key_setsadbxtype(u_int16_t);
  470 #endif
  471 static void key_porttosaddr(struct sockaddr *, u_int16_t);
  472 #define KEY_PORTTOSADDR(saddr, port)                            \
  473         key_porttosaddr((struct sockaddr *)(saddr), (port))
  474 static struct mbuf *key_setsadbxsa2(u_int8_t, u_int32_t, u_int32_t);
  475 static struct mbuf *key_setsadbxpolicy(u_int16_t, u_int8_t,
  476         u_int32_t);
  477 static struct seckey *key_dup_keymsg(const struct sadb_key *, u_int, 
  478                                      struct malloc_type *);
  479 static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src,
  480                                             struct malloc_type *type);
  481 #ifdef INET6
  482 static int key_ismyaddr6(struct sockaddr_in6 *);
  483 #endif
  484 
  485 /* flags for key_cmpsaidx() */
  486 #define CMP_HEAD        1       /* protocol, addresses. */
  487 #define CMP_MODE_REQID  2       /* additionally HEAD, reqid, mode. */
  488 #define CMP_REQID       3       /* additionally HEAD, reaid. */
  489 #define CMP_EXACTLY     4       /* all elements. */
  490 static int key_cmpsaidx(const struct secasindex *,
  491     const struct secasindex *, int);
  492 static int key_cmpspidx_exactly(struct secpolicyindex *,
  493     struct secpolicyindex *);
  494 static int key_cmpspidx_withmask(struct secpolicyindex *,
  495     struct secpolicyindex *);
  496 static int key_sockaddrcmp(const struct sockaddr *,
  497     const struct sockaddr *, int);
  498 static int key_bbcmp(const void *, const void *, u_int);
  499 static u_int16_t key_satype2proto(u_int8_t);
  500 static u_int8_t key_proto2satype(u_int16_t);
  501 
  502 static int key_getspi(struct socket *, struct mbuf *,
  503         const struct sadb_msghdr *);
  504 static u_int32_t key_do_getnewspi(struct sadb_spirange *,
  505                                         struct secasindex *);
  506 static int key_update(struct socket *, struct mbuf *,
  507         const struct sadb_msghdr *);
  508 #ifdef IPSEC_DOSEQCHECK
  509 static struct secasvar *key_getsavbyseq(struct secashead *, u_int32_t);
  510 #endif
  511 static int key_add(struct socket *, struct mbuf *,
  512         const struct sadb_msghdr *);
  513 static int key_setident(struct secashead *, struct mbuf *,
  514         const struct sadb_msghdr *);
  515 static struct mbuf *key_getmsgbuf_x1(struct mbuf *,
  516         const struct sadb_msghdr *);
  517 static int key_delete(struct socket *, struct mbuf *,
  518         const struct sadb_msghdr *);
  519 static int key_delete_all(struct socket *, struct mbuf *,
  520         const struct sadb_msghdr *, u_int16_t);
  521 static int key_get(struct socket *, struct mbuf *,
  522         const struct sadb_msghdr *);
  523 
  524 static void key_getcomb_setlifetime(struct sadb_comb *);
  525 static struct mbuf *key_getcomb_esp(void);
  526 static struct mbuf *key_getcomb_ah(void);
  527 static struct mbuf *key_getcomb_ipcomp(void);
  528 static struct mbuf *key_getprop(const struct secasindex *);
  529 
  530 static int key_acquire(const struct secasindex *, struct secpolicy *);
  531 static struct secacq *key_newacq(const struct secasindex *);
  532 static struct secacq *key_getacq(const struct secasindex *);
  533 static struct secacq *key_getacqbyseq(u_int32_t);
  534 static struct secspacq *key_newspacq(struct secpolicyindex *);
  535 static struct secspacq *key_getspacq(struct secpolicyindex *);
  536 static int key_acquire2(struct socket *, struct mbuf *,
  537         const struct sadb_msghdr *);
  538 static int key_register(struct socket *, struct mbuf *,
  539         const struct sadb_msghdr *);
  540 static int key_expire(struct secasvar *);
  541 static int key_flush(struct socket *, struct mbuf *,
  542         const struct sadb_msghdr *);
  543 static int key_dump(struct socket *, struct mbuf *,
  544         const struct sadb_msghdr *);
  545 static int key_promisc(struct socket *, struct mbuf *,
  546         const struct sadb_msghdr *);
  547 static int key_senderror(struct socket *, struct mbuf *, int);
  548 static int key_validate_ext(const struct sadb_ext *, int);
  549 static int key_align(struct mbuf *, struct sadb_msghdr *);
  550 static struct mbuf *key_setlifetime(struct seclifetime *src, 
  551                                      u_int16_t exttype);
  552 static struct mbuf *key_setkey(struct seckey *src, u_int16_t exttype);
  553 
  554 #if 0
  555 static const char *key_getfqdn(void);
  556 static const char *key_getuserfqdn(void);
  557 #endif
  558 static void key_sa_chgstate(struct secasvar *, u_int8_t);
  559 
  560 static __inline void
  561 sa_initref(struct secasvar *sav)
  562 {
  563 
  564         refcount_init(&sav->refcnt, 1);
  565 }
  566 static __inline void
  567 sa_addref(struct secasvar *sav)
  568 {
  569 
  570         refcount_acquire(&sav->refcnt);
  571         IPSEC_ASSERT(sav->refcnt != 0, ("SA refcnt overflow"));
  572 }
  573 static __inline int
  574 sa_delref(struct secasvar *sav)
  575 {
  576 
  577         IPSEC_ASSERT(sav->refcnt > 0, ("SA refcnt underflow"));
  578         return (refcount_release(&sav->refcnt));
  579 }
  580 
  581 #define SP_ADDREF(p)    refcount_acquire(&(p)->refcnt)
  582 #define SP_DELREF(p)    refcount_release(&(p)->refcnt)
  583 
  584 /*
  585  * Update the refcnt while holding the SPTREE lock.
  586  */
  587 void
  588 key_addref(struct secpolicy *sp)
  589 {
  590 
  591         SP_ADDREF(sp);
  592 }
  593 
  594 /*
  595  * Return 0 when there are known to be no SP's for the specified
  596  * direction.  Otherwise return 1.  This is used by IPsec code
  597  * to optimize performance.
  598  */
  599 int
  600 key_havesp(u_int dir)
  601 {
  602 
  603         return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ?
  604                 TAILQ_FIRST(&V_sptree[dir]) != NULL : 1);
  605 }
  606 
  607 /* %%% IPsec policy management */
  608 /*
  609  * allocating a SP for OUTBOUND or INBOUND packet.
  610  * Must call key_freesp() later.
  611  * OUT: NULL:   not found
  612  *      others: found and return the pointer.
  613  */
  614 struct secpolicy *
  615 key_allocsp(struct secpolicyindex *spidx, u_int dir, const char* where,
  616     int tag)
  617 {
  618         SPTREE_RLOCK_TRACKER;
  619         struct secpolicy *sp;
  620 
  621         IPSEC_ASSERT(spidx != NULL, ("null spidx"));
  622         IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
  623                 ("invalid direction %u", dir));
  624 
  625         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
  626                 printf("DP %s from %s:%u\n", __func__, where, tag));
  627 
  628         /* get a SP entry */
  629         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
  630                 printf("*** objects\n");
  631                 kdebug_secpolicyindex(spidx));
  632 
  633         SPTREE_RLOCK();
  634         TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
  635                 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
  636                         printf("*** in SPD\n");
  637                         kdebug_secpolicyindex(&sp->spidx));
  638                 if (key_cmpspidx_withmask(&sp->spidx, spidx))
  639                         goto found;
  640         }
  641         sp = NULL;
  642 found:
  643         if (sp) {
  644                 /* sanity check */
  645                 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__);
  646 
  647                 /* found a SPD entry */
  648                 sp->lastused = time_second;
  649                 SP_ADDREF(sp);
  650         }
  651         SPTREE_RUNLOCK();
  652 
  653         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
  654                 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__,
  655                         sp, sp ? sp->id : 0, sp ? sp->refcnt : 0));
  656         return sp;
  657 }
  658 
  659 /*
  660  * allocating a SP for OUTBOUND or INBOUND packet.
  661  * Must call key_freesp() later.
  662  * OUT: NULL:   not found
  663  *      others: found and return the pointer.
  664  */
  665 struct secpolicy *
  666 key_allocsp2(u_int32_t spi, union sockaddr_union *dst, u_int8_t proto,
  667     u_int dir, const char* where, int tag)
  668 {
  669         SPTREE_RLOCK_TRACKER;
  670         struct secpolicy *sp;
  671 
  672         IPSEC_ASSERT(dst != NULL, ("null dst"));
  673         IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
  674                 ("invalid direction %u", dir));
  675 
  676         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
  677                 printf("DP %s from %s:%u\n", __func__, where, tag));
  678 
  679         /* get a SP entry */
  680         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
  681                 printf("*** objects\n");
  682                 printf("spi %u proto %u dir %u\n", spi, proto, dir);
  683                 kdebug_sockaddr(&dst->sa));
  684 
  685         SPTREE_RLOCK();
  686         TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
  687                 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
  688                         printf("*** in SPD\n");
  689                         kdebug_secpolicyindex(&sp->spidx));
  690                 /* compare simple values, then dst address */
  691                 if (sp->spidx.ul_proto != proto)
  692                         continue;
  693                 /* NB: spi's must exist and match */
  694                 if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi)
  695                         continue;
  696                 if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0)
  697                         goto found;
  698         }
  699         sp = NULL;
  700 found:
  701         if (sp) {
  702                 /* sanity check */
  703                 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__);
  704 
  705                 /* found a SPD entry */
  706                 sp->lastused = time_second;
  707                 SP_ADDREF(sp);
  708         }
  709         SPTREE_RUNLOCK();
  710 
  711         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
  712                 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__,
  713                         sp, sp ? sp->id : 0, sp ? sp->refcnt : 0));
  714         return sp;
  715 }
  716 
  717 #if 0
  718 /*
  719  * return a policy that matches this particular inbound packet.
  720  * XXX slow
  721  */
  722 struct secpolicy *
  723 key_gettunnel(const struct sockaddr *osrc,
  724               const struct sockaddr *odst,
  725               const struct sockaddr *isrc,
  726               const struct sockaddr *idst,
  727               const char* where, int tag)
  728 {
  729         struct secpolicy *sp;
  730         const int dir = IPSEC_DIR_INBOUND;
  731         struct ipsecrequest *r1, *r2, *p;
  732         struct secpolicyindex spidx;
  733 
  734         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
  735                 printf("DP %s from %s:%u\n", __func__, where, tag));
  736 
  737         if (isrc->sa_family != idst->sa_family) {
  738                 ipseclog((LOG_ERR, "%s: protocol family mismatched %d != %d\n.",
  739                         __func__, isrc->sa_family, idst->sa_family));
  740                 sp = NULL;
  741                 goto done;
  742         }
  743 
  744         SPTREE_LOCK();
  745         LIST_FOREACH(sp, &V_sptree[dir], chain) {
  746                 if (sp->state == IPSEC_SPSTATE_DEAD)
  747                         continue;
  748 
  749                 r1 = r2 = NULL;
  750                 for (p = sp->req; p; p = p->next) {
  751                         if (p->saidx.mode != IPSEC_MODE_TUNNEL)
  752                                 continue;
  753 
  754                         r1 = r2;
  755                         r2 = p;
  756 
  757                         if (!r1) {
  758                                 /* here we look at address matches only */
  759                                 spidx = sp->spidx;
  760                                 if (isrc->sa_len > sizeof(spidx.src) ||
  761                                     idst->sa_len > sizeof(spidx.dst))
  762                                         continue;
  763                                 bcopy(isrc, &spidx.src, isrc->sa_len);
  764                                 bcopy(idst, &spidx.dst, idst->sa_len);
  765                                 if (!key_cmpspidx_withmask(&sp->spidx, &spidx))
  766                                         continue;
  767                         } else {
  768                                 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) ||
  769                                     key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0))
  770                                         continue;
  771                         }
  772 
  773                         if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) ||
  774                             key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0))
  775                                 continue;
  776 
  777                         goto found;
  778                 }
  779         }
  780         sp = NULL;
  781 found:
  782         if (sp) {
  783                 sp->lastused = time_second;
  784                 SP_ADDREF(sp);
  785         }
  786         SPTREE_UNLOCK();
  787 done:
  788         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
  789                 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__,
  790                         sp, sp ? sp->id : 0, sp ? sp->refcnt : 0));
  791         return sp;
  792 }
  793 #endif
  794 
  795 /*
  796  * allocating an SA entry for an *OUTBOUND* packet.
  797  * checking each request entries in SP, and acquire an SA if need.
  798  * OUT: 0: there are valid requests.
  799  *      ENOENT: policy may be valid, but SA with REQUIRE is on acquiring.
  800  */
  801 int
  802 key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx)
  803 {
  804         u_int level;
  805         int error;
  806         struct secasvar *sav;
  807 
  808         IPSEC_ASSERT(isr != NULL, ("null isr"));
  809         IPSEC_ASSERT(saidx != NULL, ("null saidx"));
  810         IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT ||
  811                 saidx->mode == IPSEC_MODE_TUNNEL,
  812                 ("unexpected policy %u", saidx->mode));
  813 
  814         /*
  815          * XXX guard against protocol callbacks from the crypto
  816          * thread as they reference ipsecrequest.sav which we
  817          * temporarily null out below.  Need to rethink how we
  818          * handle bundled SA's in the callback thread.
  819          */
  820         IPSECREQUEST_LOCK_ASSERT(isr);
  821 
  822         /* get current level */
  823         level = ipsec_get_reqlevel(isr);
  824 
  825         /*
  826          * We check new SA in the IPsec request because a different
  827          * SA may be involved each time this request is checked, either
  828          * because new SAs are being configured, or this request is
  829          * associated with an unconnected datagram socket, or this request
  830          * is associated with a system default policy.
  831          *
  832          * key_allocsa_policy should allocate the oldest SA available.
  833          * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt.
  834          */
  835         sav = key_allocsa_policy(saidx);
  836         if (sav != isr->sav) {
  837                 /* SA need to be updated. */
  838                 if (!IPSECREQUEST_UPGRADE(isr)) {
  839                         /* Kick everyone off. */
  840                         IPSECREQUEST_UNLOCK(isr);
  841                         IPSECREQUEST_WLOCK(isr);
  842                 }
  843                 if (isr->sav != NULL)
  844                         KEY_FREESAV(&isr->sav);
  845                 isr->sav = sav;
  846                 IPSECREQUEST_DOWNGRADE(isr);
  847         } else if (sav != NULL)
  848                 KEY_FREESAV(&sav);
  849 
  850         /* When there is SA. */
  851         if (isr->sav != NULL) {
  852                 if (isr->sav->state != SADB_SASTATE_MATURE &&
  853                     isr->sav->state != SADB_SASTATE_DYING)
  854                         return EINVAL;
  855                 return 0;
  856         }
  857 
  858         /* there is no SA */
  859         error = key_acquire(saidx, isr->sp);
  860         if (error != 0) {
  861                 /* XXX What should I do ? */
  862                 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n",
  863                         __func__, error));
  864                 return error;
  865         }
  866 
  867         if (level != IPSEC_LEVEL_REQUIRE) {
  868                 /* XXX sigh, the interface to this routine is botched */
  869                 IPSEC_ASSERT(isr->sav == NULL, ("unexpected SA"));
  870                 return 0;
  871         } else {
  872                 return ENOENT;
  873         }
  874 }
  875 
  876 /*
  877  * allocating a SA for policy entry from SAD.
  878  * NOTE: searching SAD of aliving state.
  879  * OUT: NULL:   not found.
  880  *      others: found and return the pointer.
  881  */
  882 static struct secasvar *
  883 key_allocsa_policy(const struct secasindex *saidx)
  884 {
  885 #define N(a)    _ARRAYLEN(a)
  886         struct secashead *sah;
  887         struct secasvar *sav;
  888         u_int stateidx, arraysize;
  889         const u_int *state_valid;
  890 
  891         state_valid = NULL;     /* silence gcc */
  892         arraysize = 0;          /* silence gcc */
  893 
  894         SAHTREE_LOCK();
  895         LIST_FOREACH(sah, &V_sahtree, chain) {
  896                 if (sah->state == SADB_SASTATE_DEAD)
  897                         continue;
  898                 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID)) {
  899                         if (V_key_preferred_oldsa) {
  900                                 state_valid = saorder_state_valid_prefer_old;
  901                                 arraysize = N(saorder_state_valid_prefer_old);
  902                         } else {
  903                                 state_valid = saorder_state_valid_prefer_new;
  904                                 arraysize = N(saorder_state_valid_prefer_new);
  905                         }
  906                         break;
  907                 }
  908         }
  909         SAHTREE_UNLOCK();
  910         if (sah == NULL)
  911                 return NULL;
  912 
  913         /* search valid state */
  914         for (stateidx = 0; stateidx < arraysize; stateidx++) {
  915                 sav = key_do_allocsa_policy(sah, state_valid[stateidx]);
  916                 if (sav != NULL)
  917                         return sav;
  918         }
  919 
  920         return NULL;
  921 #undef N
  922 }
  923 
  924 /*
  925  * searching SAD with direction, protocol, mode and state.
  926  * called by key_allocsa_policy().
  927  * OUT:
  928  *      NULL    : not found
  929  *      others  : found, pointer to a SA.
  930  */
  931 static struct secasvar *
  932 key_do_allocsa_policy(struct secashead *sah, u_int state)
  933 {
  934         struct secasvar *sav, *nextsav, *candidate, *d;
  935 
  936         /* initilize */
  937         candidate = NULL;
  938 
  939         SAHTREE_LOCK();
  940         for (sav = LIST_FIRST(&sah->savtree[state]);
  941              sav != NULL;
  942              sav = nextsav) {
  943 
  944                 nextsav = LIST_NEXT(sav, chain);
  945 
  946                 /* sanity check */
  947                 KEY_CHKSASTATE(sav->state, state, __func__);
  948 
  949                 /* initialize */
  950                 if (candidate == NULL) {
  951                         candidate = sav;
  952                         continue;
  953                 }
  954 
  955                 /* Which SA is the better ? */
  956 
  957                 IPSEC_ASSERT(candidate->lft_c != NULL,
  958                         ("null candidate lifetime"));
  959                 IPSEC_ASSERT(sav->lft_c != NULL, ("null sav lifetime"));
  960 
  961                 /* What the best method is to compare ? */
  962                 if (V_key_preferred_oldsa) {
  963                         if (candidate->lft_c->addtime >
  964                                         sav->lft_c->addtime) {
  965                                 candidate = sav;
  966                         }
  967                         continue;
  968                         /*NOTREACHED*/
  969                 }
  970 
  971                 /* preferred new sa rather than old sa */
  972                 if (candidate->lft_c->addtime <
  973                                 sav->lft_c->addtime) {
  974                         d = candidate;
  975                         candidate = sav;
  976                 } else
  977                         d = sav;
  978 
  979                 /*
  980                  * prepared to delete the SA when there is more
  981                  * suitable candidate and the lifetime of the SA is not
  982                  * permanent.
  983                  */
  984                 if (d->lft_h->addtime != 0) {
  985                         struct mbuf *m, *result;
  986                         u_int8_t satype;
  987 
  988                         key_sa_chgstate(d, SADB_SASTATE_DEAD);
  989 
  990                         IPSEC_ASSERT(d->refcnt > 0, ("bogus ref count"));
  991 
  992                         satype = key_proto2satype(d->sah->saidx.proto);
  993                         if (satype == 0)
  994                                 goto msgfail;
  995 
  996                         m = key_setsadbmsg(SADB_DELETE, 0,
  997                             satype, 0, 0, d->refcnt - 1);
  998                         if (!m)
  999                                 goto msgfail;
 1000                         result = m;
 1001 
 1002                         /* set sadb_address for saidx's. */
 1003                         m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
 1004                                 &d->sah->saidx.src.sa,
 1005                                 d->sah->saidx.src.sa.sa_len << 3,
 1006                                 IPSEC_ULPROTO_ANY);
 1007                         if (!m)
 1008                                 goto msgfail;
 1009                         m_cat(result, m);
 1010 
 1011                         /* set sadb_address for saidx's. */
 1012                         m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
 1013                                 &d->sah->saidx.dst.sa,
 1014                                 d->sah->saidx.dst.sa.sa_len << 3,
 1015                                 IPSEC_ULPROTO_ANY);
 1016                         if (!m)
 1017                                 goto msgfail;
 1018                         m_cat(result, m);
 1019 
 1020                         /* create SA extension */
 1021                         m = key_setsadbsa(d);
 1022                         if (!m)
 1023                                 goto msgfail;
 1024                         m_cat(result, m);
 1025 
 1026                         if (result->m_len < sizeof(struct sadb_msg)) {
 1027                                 result = m_pullup(result,
 1028                                                 sizeof(struct sadb_msg));
 1029                                 if (result == NULL)
 1030                                         goto msgfail;
 1031                         }
 1032 
 1033                         result->m_pkthdr.len = 0;
 1034                         for (m = result; m; m = m->m_next)
 1035                                 result->m_pkthdr.len += m->m_len;
 1036                         mtod(result, struct sadb_msg *)->sadb_msg_len =
 1037                                 PFKEY_UNIT64(result->m_pkthdr.len);
 1038 
 1039                         if (key_sendup_mbuf(NULL, result,
 1040                                         KEY_SENDUP_REGISTERED))
 1041                                 goto msgfail;
 1042                  msgfail:
 1043                         KEY_FREESAV(&d);
 1044                 }
 1045         }
 1046         if (candidate) {
 1047                 sa_addref(candidate);
 1048                 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 1049                         printf("DP %s cause refcnt++:%d SA:%p\n",
 1050                                 __func__, candidate->refcnt, candidate));
 1051         }
 1052         SAHTREE_UNLOCK();
 1053 
 1054         return candidate;
 1055 }
 1056 
 1057 /*
 1058  * allocating a usable SA entry for a *INBOUND* packet.
 1059  * Must call key_freesav() later.
 1060  * OUT: positive:       pointer to a usable sav (i.e. MATURE or DYING state).
 1061  *      NULL:           not found, or error occured.
 1062  *
 1063  * In the comparison, no source address is used--for RFC2401 conformance.
 1064  * To quote, from section 4.1:
 1065  *      A security association is uniquely identified by a triple consisting
 1066  *      of a Security Parameter Index (SPI), an IP Destination Address, and a
 1067  *      security protocol (AH or ESP) identifier.
 1068  * Note that, however, we do need to keep source address in IPsec SA.
 1069  * IKE specification and PF_KEY specification do assume that we
 1070  * keep source address in IPsec SA.  We see a tricky situation here.
 1071  */
 1072 struct secasvar *
 1073 key_allocsa(union sockaddr_union *dst, u_int proto, u_int32_t spi,
 1074     const char* where, int tag)
 1075 {
 1076         struct secashead *sah;
 1077         struct secasvar *sav;
 1078         u_int stateidx, arraysize, state;
 1079         const u_int *saorder_state_valid;
 1080 #ifdef IPSEC_NAT_T
 1081         int natt_chkport;
 1082 #endif
 1083 
 1084         IPSEC_ASSERT(dst != NULL, ("null dst address"));
 1085 
 1086         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 1087                 printf("DP %s from %s:%u\n", __func__, where, tag));
 1088 
 1089 #ifdef IPSEC_NAT_T
 1090         natt_chkport = (dst->sa.sa_family == AF_INET &&
 1091             dst->sa.sa_len == sizeof(struct sockaddr_in) &&
 1092             dst->sin.sin_port != 0);
 1093 #endif
 1094 
 1095         /*
 1096          * searching SAD.
 1097          * XXX: to be checked internal IP header somewhere.  Also when
 1098          * IPsec tunnel packet is received.  But ESP tunnel mode is
 1099          * encrypted so we can't check internal IP header.
 1100          */
 1101         SAHTREE_LOCK();
 1102         if (V_key_preferred_oldsa) {
 1103                 saorder_state_valid = saorder_state_valid_prefer_old;
 1104                 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old);
 1105         } else {
 1106                 saorder_state_valid = saorder_state_valid_prefer_new;
 1107                 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new);
 1108         }
 1109         LIST_FOREACH(sah, &V_sahtree, chain) {
 1110                 int checkport;
 1111 
 1112                 /* search valid state */
 1113                 for (stateidx = 0; stateidx < arraysize; stateidx++) {
 1114                         state = saorder_state_valid[stateidx];
 1115                         LIST_FOREACH(sav, &sah->savtree[state], chain) {
 1116                                 /* sanity check */
 1117                                 KEY_CHKSASTATE(sav->state, state, __func__);
 1118                                 /* do not return entries w/ unusable state */
 1119                                 if (sav->state != SADB_SASTATE_MATURE &&
 1120                                     sav->state != SADB_SASTATE_DYING)
 1121                                         continue;
 1122                                 if (proto != sav->sah->saidx.proto)
 1123                                         continue;
 1124                                 if (spi != sav->spi)
 1125                                         continue;
 1126                                 checkport = 0;
 1127 #ifdef IPSEC_NAT_T
 1128                                 /*
 1129                                  * Really only check ports when this is a NAT-T
 1130                                  * SA.  Otherwise other lookups providing ports
 1131                                  * might suffer.
 1132                                  */
 1133                                 if (sav->natt_type && natt_chkport)
 1134                                         checkport = 1;
 1135 #endif
 1136 #if 0   /* don't check src */
 1137                                 /* check src address */
 1138                                 if (key_sockaddrcmp(&src->sa,   
 1139                                     &sav->sah->saidx.src.sa, checkport) != 0)
 1140                                         continue;
 1141 #endif
 1142                                 /* check dst address */
 1143                                 if (key_sockaddrcmp(&dst->sa,
 1144                                     &sav->sah->saidx.dst.sa, checkport) != 0)
 1145                                         continue;
 1146                                 sa_addref(sav);
 1147                                 goto done;
 1148                         }
 1149                 }
 1150         }
 1151         sav = NULL;
 1152 done:
 1153         SAHTREE_UNLOCK();
 1154 
 1155         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 1156                 printf("DP %s return SA:%p; refcnt %u\n", __func__,
 1157                         sav, sav ? sav->refcnt : 0));
 1158         return sav;
 1159 }
 1160 
 1161 /*
 1162  * Must be called after calling key_allocsp().
 1163  * For both the packet without socket and key_freeso().
 1164  */
 1165 void
 1166 _key_freesp(struct secpolicy **spp, const char* where, int tag)
 1167 {
 1168         struct ipsecrequest *isr, *nextisr;
 1169         struct secpolicy *sp = *spp;
 1170 
 1171         IPSEC_ASSERT(sp != NULL, ("null sp"));
 1172         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 1173                 printf("DP %s SP:%p (ID=%u) from %s:%u; refcnt now %u\n",
 1174                         __func__, sp, sp->id, where, tag, sp->refcnt));
 1175 
 1176         if (SP_DELREF(sp) == 0)
 1177                 return;
 1178         *spp = NULL;
 1179         for (isr = sp->req; isr != NULL; isr = nextisr) {
 1180                 if (isr->sav != NULL) {
 1181                         KEY_FREESAV(&isr->sav);
 1182                         isr->sav = NULL;
 1183                 }
 1184                 nextisr = isr->next;
 1185                 ipsec_delisr(isr);
 1186         }
 1187         free(sp, M_IPSEC_SP);
 1188 }
 1189 
 1190 static void
 1191 key_unlink(struct secpolicy *sp)
 1192 {
 1193 
 1194         IPSEC_ASSERT(sp != NULL, ("null sp"));
 1195         IPSEC_ASSERT(sp->spidx.dir == IPSEC_DIR_INBOUND ||
 1196             sp->spidx.dir == IPSEC_DIR_OUTBOUND,
 1197             ("invalid direction %u", sp->spidx.dir));
 1198         SPTREE_UNLOCK_ASSERT();
 1199 
 1200         SPTREE_WLOCK();
 1201         if (sp->state == IPSEC_SPSTATE_DEAD) {
 1202                 SPTREE_WUNLOCK();
 1203                 return;
 1204         }
 1205         sp->state = IPSEC_SPSTATE_DEAD;
 1206         TAILQ_REMOVE(&V_sptree[sp->spidx.dir], sp, chain);
 1207         SPTREE_WUNLOCK();
 1208         KEY_FREESP(&sp);
 1209 }
 1210 
 1211 /*
 1212  * Must be called after calling key_allocsp().
 1213  * For the packet with socket.
 1214  */
 1215 void
 1216 key_freeso(struct socket *so)
 1217 {
 1218         IPSEC_ASSERT(so != NULL, ("null so"));
 1219 
 1220         switch (so->so_proto->pr_domain->dom_family) {
 1221 #if defined(INET) || defined(INET6)
 1222 #ifdef INET
 1223         case PF_INET:
 1224 #endif
 1225 #ifdef INET6
 1226         case PF_INET6:
 1227 #endif
 1228             {
 1229                 struct inpcb *pcb = sotoinpcb(so);
 1230 
 1231                 /* Does it have a PCB ? */
 1232                 if (pcb == NULL)
 1233                         return;
 1234                 key_freesp_so(&pcb->inp_sp->sp_in);
 1235                 key_freesp_so(&pcb->inp_sp->sp_out);
 1236             }
 1237                 break;
 1238 #endif /* INET || INET6 */
 1239         default:
 1240                 ipseclog((LOG_DEBUG, "%s: unknown address family=%d.\n",
 1241                     __func__, so->so_proto->pr_domain->dom_family));
 1242                 return;
 1243         }
 1244 }
 1245 
 1246 static void
 1247 key_freesp_so(struct secpolicy **sp)
 1248 {
 1249         IPSEC_ASSERT(sp != NULL && *sp != NULL, ("null sp"));
 1250 
 1251         if ((*sp)->policy == IPSEC_POLICY_ENTRUST ||
 1252             (*sp)->policy == IPSEC_POLICY_BYPASS)
 1253                 return;
 1254 
 1255         IPSEC_ASSERT((*sp)->policy == IPSEC_POLICY_IPSEC,
 1256                 ("invalid policy %u", (*sp)->policy));
 1257         KEY_FREESP(sp);
 1258 }
 1259 
 1260 void
 1261 key_addrefsa(struct secasvar *sav, const char* where, int tag)
 1262 {
 1263 
 1264         IPSEC_ASSERT(sav != NULL, ("null sav"));
 1265         IPSEC_ASSERT(sav->refcnt > 0, ("refcount must exist"));
 1266 
 1267         sa_addref(sav);
 1268 }
 1269 
 1270 /*
 1271  * Must be called after calling key_allocsa().
 1272  * This function is called by key_freesp() to free some SA allocated
 1273  * for a policy.
 1274  */
 1275 void
 1276 key_freesav(struct secasvar **psav, const char* where, int tag)
 1277 {
 1278         struct secasvar *sav = *psav;
 1279 
 1280         IPSEC_ASSERT(sav != NULL, ("null sav"));
 1281 
 1282         if (sa_delref(sav)) {
 1283                 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 1284                         printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n",
 1285                                 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt));
 1286                 *psav = NULL;
 1287                 key_delsav(sav);
 1288         } else {
 1289                 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 1290                         printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n",
 1291                                 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt));
 1292         }
 1293 }
 1294 
 1295 /* %%% SPD management */
 1296 /*
 1297  * search SPD
 1298  * OUT: NULL    : not found
 1299  *      others  : found, pointer to a SP.
 1300  */
 1301 static struct secpolicy *
 1302 key_getsp(struct secpolicyindex *spidx)
 1303 {
 1304         SPTREE_RLOCK_TRACKER;
 1305         struct secpolicy *sp;
 1306 
 1307         IPSEC_ASSERT(spidx != NULL, ("null spidx"));
 1308 
 1309         SPTREE_RLOCK();
 1310         TAILQ_FOREACH(sp, &V_sptree[spidx->dir], chain) {
 1311                 if (key_cmpspidx_exactly(spidx, &sp->spidx)) {
 1312                         SP_ADDREF(sp);
 1313                         break;
 1314                 }
 1315         }
 1316         SPTREE_RUNLOCK();
 1317 
 1318         return sp;
 1319 }
 1320 
 1321 /*
 1322  * get SP by index.
 1323  * OUT: NULL    : not found
 1324  *      others  : found, pointer to a SP.
 1325  */
 1326 static struct secpolicy *
 1327 key_getspbyid(u_int32_t id)
 1328 {
 1329         SPTREE_RLOCK_TRACKER;
 1330         struct secpolicy *sp;
 1331 
 1332         SPTREE_RLOCK();
 1333         TAILQ_FOREACH(sp, &V_sptree[IPSEC_DIR_INBOUND], chain) {
 1334                 if (sp->id == id) {
 1335                         SP_ADDREF(sp);
 1336                         goto done;
 1337                 }
 1338         }
 1339 
 1340         TAILQ_FOREACH(sp, &V_sptree[IPSEC_DIR_OUTBOUND], chain) {
 1341                 if (sp->id == id) {
 1342                         SP_ADDREF(sp);
 1343                         goto done;
 1344                 }
 1345         }
 1346 done:
 1347         SPTREE_RUNLOCK();
 1348 
 1349         return sp;
 1350 }
 1351 
 1352 struct secpolicy *
 1353 key_newsp(const char* where, int tag)
 1354 {
 1355         struct secpolicy *newsp = NULL;
 1356 
 1357         newsp = (struct secpolicy *)
 1358                 malloc(sizeof(struct secpolicy), M_IPSEC_SP, M_NOWAIT|M_ZERO);
 1359         if (newsp)
 1360                 refcount_init(&newsp->refcnt, 1);
 1361 
 1362         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 1363                 printf("DP %s from %s:%u return SP:%p\n", __func__,
 1364                         where, tag, newsp));
 1365         return newsp;
 1366 }
 1367 
 1368 /*
 1369  * create secpolicy structure from sadb_x_policy structure.
 1370  * NOTE: `state', `secpolicyindex' in secpolicy structure are not set,
 1371  * so must be set properly later.
 1372  */
 1373 struct secpolicy *
 1374 key_msg2sp(struct sadb_x_policy *xpl0, size_t len, int *error)
 1375 {
 1376         struct secpolicy *newsp;
 1377 
 1378         IPSEC_ASSERT(xpl0 != NULL, ("null xpl0"));
 1379         IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len));
 1380 
 1381         if (len != PFKEY_EXTLEN(xpl0)) {
 1382                 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__));
 1383                 *error = EINVAL;
 1384                 return NULL;
 1385         }
 1386 
 1387         if ((newsp = KEY_NEWSP()) == NULL) {
 1388                 *error = ENOBUFS;
 1389                 return NULL;
 1390         }
 1391 
 1392         newsp->spidx.dir = xpl0->sadb_x_policy_dir;
 1393         newsp->policy = xpl0->sadb_x_policy_type;
 1394 
 1395         /* check policy */
 1396         switch (xpl0->sadb_x_policy_type) {
 1397         case IPSEC_POLICY_DISCARD:
 1398         case IPSEC_POLICY_NONE:
 1399         case IPSEC_POLICY_ENTRUST:
 1400         case IPSEC_POLICY_BYPASS:
 1401                 newsp->req = NULL;
 1402                 break;
 1403 
 1404         case IPSEC_POLICY_IPSEC:
 1405             {
 1406                 int tlen;
 1407                 struct sadb_x_ipsecrequest *xisr;
 1408                 struct ipsecrequest **p_isr = &newsp->req;
 1409 
 1410                 /* validity check */
 1411                 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) {
 1412                         ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n",
 1413                                 __func__));
 1414                         KEY_FREESP(&newsp);
 1415                         *error = EINVAL;
 1416                         return NULL;
 1417                 }
 1418 
 1419                 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0);
 1420                 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1);
 1421 
 1422                 while (tlen > 0) {
 1423                         /* length check */
 1424                         if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) {
 1425                                 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest "
 1426                                         "length.\n", __func__));
 1427                                 KEY_FREESP(&newsp);
 1428                                 *error = EINVAL;
 1429                                 return NULL;
 1430                         }
 1431 
 1432                         /* allocate request buffer */
 1433                         /* NB: data structure is zero'd */
 1434                         *p_isr = ipsec_newisr();
 1435                         if ((*p_isr) == NULL) {
 1436                                 ipseclog((LOG_DEBUG,
 1437                                     "%s: No more memory.\n", __func__));
 1438                                 KEY_FREESP(&newsp);
 1439                                 *error = ENOBUFS;
 1440                                 return NULL;
 1441                         }
 1442 
 1443                         /* set values */
 1444                         switch (xisr->sadb_x_ipsecrequest_proto) {
 1445                         case IPPROTO_ESP:
 1446                         case IPPROTO_AH:
 1447                         case IPPROTO_IPCOMP:
 1448                                 break;
 1449                         default:
 1450                                 ipseclog((LOG_DEBUG,
 1451                                     "%s: invalid proto type=%u\n", __func__,
 1452                                     xisr->sadb_x_ipsecrequest_proto));
 1453                                 KEY_FREESP(&newsp);
 1454                                 *error = EPROTONOSUPPORT;
 1455                                 return NULL;
 1456                         }
 1457                         (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto;
 1458 
 1459                         switch (xisr->sadb_x_ipsecrequest_mode) {
 1460                         case IPSEC_MODE_TRANSPORT:
 1461                         case IPSEC_MODE_TUNNEL:
 1462                                 break;
 1463                         case IPSEC_MODE_ANY:
 1464                         default:
 1465                                 ipseclog((LOG_DEBUG,
 1466                                     "%s: invalid mode=%u\n", __func__,
 1467                                     xisr->sadb_x_ipsecrequest_mode));
 1468                                 KEY_FREESP(&newsp);
 1469                                 *error = EINVAL;
 1470                                 return NULL;
 1471                         }
 1472                         (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode;
 1473 
 1474                         switch (xisr->sadb_x_ipsecrequest_level) {
 1475                         case IPSEC_LEVEL_DEFAULT:
 1476                         case IPSEC_LEVEL_USE:
 1477                         case IPSEC_LEVEL_REQUIRE:
 1478                                 break;
 1479                         case IPSEC_LEVEL_UNIQUE:
 1480                                 /* validity check */
 1481                                 /*
 1482                                  * If range violation of reqid, kernel will
 1483                                  * update it, don't refuse it.
 1484                                  */
 1485                                 if (xisr->sadb_x_ipsecrequest_reqid
 1486                                                 > IPSEC_MANUAL_REQID_MAX) {
 1487                                         ipseclog((LOG_DEBUG,
 1488                                             "%s: reqid=%d range "
 1489                                             "violation, updated by kernel.\n",
 1490                                             __func__,
 1491                                             xisr->sadb_x_ipsecrequest_reqid));
 1492                                         xisr->sadb_x_ipsecrequest_reqid = 0;
 1493                                 }
 1494 
 1495                                 /* allocate new reqid id if reqid is zero. */
 1496                                 if (xisr->sadb_x_ipsecrequest_reqid == 0) {
 1497                                         u_int32_t reqid;
 1498                                         if ((reqid = key_newreqid()) == 0) {
 1499                                                 KEY_FREESP(&newsp);
 1500                                                 *error = ENOBUFS;
 1501                                                 return NULL;
 1502                                         }
 1503                                         (*p_isr)->saidx.reqid = reqid;
 1504                                         xisr->sadb_x_ipsecrequest_reqid = reqid;
 1505                                 } else {
 1506                                 /* set it for manual keying. */
 1507                                         (*p_isr)->saidx.reqid =
 1508                                                 xisr->sadb_x_ipsecrequest_reqid;
 1509                                 }
 1510                                 break;
 1511 
 1512                         default:
 1513                                 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n",
 1514                                         __func__,
 1515                                         xisr->sadb_x_ipsecrequest_level));
 1516                                 KEY_FREESP(&newsp);
 1517                                 *error = EINVAL;
 1518                                 return NULL;
 1519                         }
 1520                         (*p_isr)->level = xisr->sadb_x_ipsecrequest_level;
 1521 
 1522                         /* set IP addresses if there */
 1523                         if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
 1524                                 struct sockaddr *paddr;
 1525 
 1526                                 paddr = (struct sockaddr *)(xisr + 1);
 1527 
 1528                                 /* validity check */
 1529                                 if (paddr->sa_len
 1530                                     > sizeof((*p_isr)->saidx.src)) {
 1531                                         ipseclog((LOG_DEBUG, "%s: invalid "
 1532                                                 "request address length.\n",
 1533                                                 __func__));
 1534                                         KEY_FREESP(&newsp);
 1535                                         *error = EINVAL;
 1536                                         return NULL;
 1537                                 }
 1538                                 bcopy(paddr, &(*p_isr)->saidx.src,
 1539                                         paddr->sa_len);
 1540 
 1541                                 paddr = (struct sockaddr *)((caddr_t)paddr
 1542                                                         + paddr->sa_len);
 1543 
 1544                                 /* validity check */
 1545                                 if (paddr->sa_len
 1546                                     > sizeof((*p_isr)->saidx.dst)) {
 1547                                         ipseclog((LOG_DEBUG, "%s: invalid "
 1548                                                 "request address length.\n",
 1549                                                 __func__));
 1550                                         KEY_FREESP(&newsp);
 1551                                         *error = EINVAL;
 1552                                         return NULL;
 1553                                 }
 1554                                 bcopy(paddr, &(*p_isr)->saidx.dst,
 1555                                         paddr->sa_len);
 1556                         }
 1557 
 1558                         (*p_isr)->sp = newsp;
 1559 
 1560                         /* initialization for the next. */
 1561                         p_isr = &(*p_isr)->next;
 1562                         tlen -= xisr->sadb_x_ipsecrequest_len;
 1563 
 1564                         /* validity check */
 1565                         if (tlen < 0) {
 1566                                 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n",
 1567                                         __func__));
 1568                                 KEY_FREESP(&newsp);
 1569                                 *error = EINVAL;
 1570                                 return NULL;
 1571                         }
 1572 
 1573                         xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr
 1574                                          + xisr->sadb_x_ipsecrequest_len);
 1575                 }
 1576             }
 1577                 break;
 1578         default:
 1579                 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__));
 1580                 KEY_FREESP(&newsp);
 1581                 *error = EINVAL;
 1582                 return NULL;
 1583         }
 1584 
 1585         *error = 0;
 1586         return newsp;
 1587 }
 1588 
 1589 static u_int32_t
 1590 key_newreqid()
 1591 {
 1592         static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1;
 1593 
 1594         auto_reqid = (auto_reqid == ~0
 1595                         ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1);
 1596 
 1597         /* XXX should be unique check */
 1598 
 1599         return auto_reqid;
 1600 }
 1601 
 1602 /*
 1603  * copy secpolicy struct to sadb_x_policy structure indicated.
 1604  */
 1605 struct mbuf *
 1606 key_sp2msg(struct secpolicy *sp)
 1607 {
 1608         struct sadb_x_policy *xpl;
 1609         int tlen;
 1610         caddr_t p;
 1611         struct mbuf *m;
 1612 
 1613         IPSEC_ASSERT(sp != NULL, ("null policy"));
 1614 
 1615         tlen = key_getspreqmsglen(sp);
 1616 
 1617         m = m_get2(tlen, M_NOWAIT, MT_DATA, 0);
 1618         if (m == NULL)
 1619                 return (NULL);
 1620         m_align(m, tlen);
 1621         m->m_len = tlen;
 1622         xpl = mtod(m, struct sadb_x_policy *);
 1623         bzero(xpl, tlen);
 1624 
 1625         xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen);
 1626         xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
 1627         xpl->sadb_x_policy_type = sp->policy;
 1628         xpl->sadb_x_policy_dir = sp->spidx.dir;
 1629         xpl->sadb_x_policy_id = sp->id;
 1630         p = (caddr_t)xpl + sizeof(*xpl);
 1631 
 1632         /* if is the policy for ipsec ? */
 1633         if (sp->policy == IPSEC_POLICY_IPSEC) {
 1634                 struct sadb_x_ipsecrequest *xisr;
 1635                 struct ipsecrequest *isr;
 1636 
 1637                 for (isr = sp->req; isr != NULL; isr = isr->next) {
 1638 
 1639                         xisr = (struct sadb_x_ipsecrequest *)p;
 1640 
 1641                         xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto;
 1642                         xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode;
 1643                         xisr->sadb_x_ipsecrequest_level = isr->level;
 1644                         xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid;
 1645 
 1646                         p += sizeof(*xisr);
 1647                         bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len);
 1648                         p += isr->saidx.src.sa.sa_len;
 1649                         bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len);
 1650                         p += isr->saidx.src.sa.sa_len;
 1651 
 1652                         xisr->sadb_x_ipsecrequest_len =
 1653                                 PFKEY_ALIGN8(sizeof(*xisr)
 1654                                         + isr->saidx.src.sa.sa_len
 1655                                         + isr->saidx.dst.sa.sa_len);
 1656                 }
 1657         }
 1658 
 1659         return m;
 1660 }
 1661 
 1662 /* m will not be freed nor modified */
 1663 static struct mbuf *
 1664 key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp,
 1665     int ndeep, int nitem, ...)
 1666 {
 1667         va_list ap;
 1668         int idx;
 1669         int i;
 1670         struct mbuf *result = NULL, *n;
 1671         int len;
 1672 
 1673         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 1674         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 1675 
 1676         va_start(ap, nitem);
 1677         for (i = 0; i < nitem; i++) {
 1678                 idx = va_arg(ap, int);
 1679                 if (idx < 0 || idx > SADB_EXT_MAX)
 1680                         goto fail;
 1681                 /* don't attempt to pull empty extension */
 1682                 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL)
 1683                         continue;
 1684                 if (idx != SADB_EXT_RESERVED  &&
 1685                     (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0))
 1686                         continue;
 1687 
 1688                 if (idx == SADB_EXT_RESERVED) {
 1689                         len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
 1690 
 1691                         IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len));
 1692 
 1693                         MGETHDR(n, M_NOWAIT, MT_DATA);
 1694                         if (!n)
 1695                                 goto fail;
 1696                         n->m_len = len;
 1697                         n->m_next = NULL;
 1698                         m_copydata(m, 0, sizeof(struct sadb_msg),
 1699                             mtod(n, caddr_t));
 1700                 } else if (i < ndeep) {
 1701                         len = mhp->extlen[idx];
 1702                         n = m_get2(len, M_NOWAIT, MT_DATA, 0);
 1703                         if (n == NULL)
 1704                                 goto fail;
 1705                         m_align(n, len);
 1706                         n->m_len = len;
 1707                         m_copydata(m, mhp->extoff[idx], mhp->extlen[idx],
 1708                             mtod(n, caddr_t));
 1709                 } else {
 1710                         n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx],
 1711                             M_NOWAIT);
 1712                 }
 1713                 if (n == NULL)
 1714                         goto fail;
 1715 
 1716                 if (result)
 1717                         m_cat(result, n);
 1718                 else
 1719                         result = n;
 1720         }
 1721         va_end(ap);
 1722 
 1723         if ((result->m_flags & M_PKTHDR) != 0) {
 1724                 result->m_pkthdr.len = 0;
 1725                 for (n = result; n; n = n->m_next)
 1726                         result->m_pkthdr.len += n->m_len;
 1727         }
 1728 
 1729         return result;
 1730 
 1731 fail:
 1732         m_freem(result);
 1733         va_end(ap);
 1734         return NULL;
 1735 }
 1736 
 1737 /*
 1738  * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing
 1739  * add an entry to SP database, when received
 1740  *   <base, address(SD), (lifetime(H),) policy>
 1741  * from the user(?).
 1742  * Adding to SP database,
 1743  * and send
 1744  *   <base, address(SD), (lifetime(H),) policy>
 1745  * to the socket which was send.
 1746  *
 1747  * SPDADD set a unique policy entry.
 1748  * SPDSETIDX like SPDADD without a part of policy requests.
 1749  * SPDUPDATE replace a unique policy entry.
 1750  *
 1751  * m will always be freed.
 1752  */
 1753 static int
 1754 key_spdadd(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
 1755 {
 1756         struct sadb_address *src0, *dst0;
 1757         struct sadb_x_policy *xpl0, *xpl;
 1758         struct sadb_lifetime *lft = NULL;
 1759         struct secpolicyindex spidx;
 1760         struct secpolicy *newsp;
 1761         int error;
 1762 
 1763         IPSEC_ASSERT(so != NULL, ("null socket"));
 1764         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 1765         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 1766         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 1767 
 1768         if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
 1769             mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
 1770             mhp->ext[SADB_X_EXT_POLICY] == NULL) {
 1771                 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n"));
 1772                 return key_senderror(so, m, EINVAL);
 1773         }
 1774         if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
 1775             mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) ||
 1776             mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
 1777                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 1778                         __func__));
 1779                 return key_senderror(so, m, EINVAL);
 1780         }
 1781         if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) {
 1782                 if (mhp->extlen[SADB_EXT_LIFETIME_HARD]
 1783                         < sizeof(struct sadb_lifetime)) {
 1784                         ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 1785                                 __func__));
 1786                         return key_senderror(so, m, EINVAL);
 1787                 }
 1788                 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD];
 1789         }
 1790 
 1791         src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
 1792         dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
 1793         xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];
 1794 
 1795         /* 
 1796          * Note: do not parse SADB_X_EXT_NAT_T_* here:
 1797          * we are processing traffic endpoints.
 1798          */
 1799 
 1800         /* make secindex */
 1801         /* XXX boundary check against sa_len */
 1802         KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
 1803                         src0 + 1,
 1804                         dst0 + 1,
 1805                         src0->sadb_address_prefixlen,
 1806                         dst0->sadb_address_prefixlen,
 1807                         src0->sadb_address_proto,
 1808                         &spidx);
 1809 
 1810         /* checking the direciton. */
 1811         switch (xpl0->sadb_x_policy_dir) {
 1812         case IPSEC_DIR_INBOUND:
 1813         case IPSEC_DIR_OUTBOUND:
 1814                 break;
 1815         default:
 1816                 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__));
 1817                 mhp->msg->sadb_msg_errno = EINVAL;
 1818                 return 0;
 1819         }
 1820 
 1821         /* check policy */
 1822         /* key_spdadd() accepts DISCARD, NONE and IPSEC. */
 1823         if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST
 1824          || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) {
 1825                 ipseclog((LOG_DEBUG, "%s: Invalid policy type.\n", __func__));
 1826                 return key_senderror(so, m, EINVAL);
 1827         }
 1828 
 1829         /* policy requests are mandatory when action is ipsec. */
 1830         if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX
 1831          && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC
 1832          && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) {
 1833                 ipseclog((LOG_DEBUG, "%s: some policy requests part required\n",
 1834                         __func__));
 1835                 return key_senderror(so, m, EINVAL);
 1836         }
 1837 
 1838         /*
 1839          * checking there is SP already or not.
 1840          * SPDUPDATE doesn't depend on whether there is a SP or not.
 1841          * If the type is either SPDADD or SPDSETIDX AND a SP is found,
 1842          * then error.
 1843          */
 1844         newsp = key_getsp(&spidx);
 1845         if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) {
 1846                 if (newsp) {
 1847                         key_unlink(newsp);
 1848                         KEY_FREESP(&newsp);
 1849                 }
 1850         } else {
 1851                 if (newsp != NULL) {
 1852                         KEY_FREESP(&newsp);
 1853                         ipseclog((LOG_DEBUG, "%s: a SP entry exists already.\n",
 1854                                 __func__));
 1855                         return key_senderror(so, m, EEXIST);
 1856                 }
 1857         }
 1858 
 1859         /* XXX: there is race between key_getsp and key_msg2sp. */
 1860 
 1861         /* allocation new SP entry */
 1862         if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) {
 1863                 return key_senderror(so, m, error);
 1864         }
 1865 
 1866         if ((newsp->id = key_getnewspid()) == 0) {
 1867                 KEY_FREESP(&newsp);
 1868                 return key_senderror(so, m, ENOBUFS);
 1869         }
 1870 
 1871         /* XXX boundary check against sa_len */
 1872         KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
 1873                         src0 + 1,
 1874                         dst0 + 1,
 1875                         src0->sadb_address_prefixlen,
 1876                         dst0->sadb_address_prefixlen,
 1877                         src0->sadb_address_proto,
 1878                         &newsp->spidx);
 1879 
 1880         /* sanity check on addr pair */
 1881         if (((struct sockaddr *)(src0 + 1))->sa_family !=
 1882                         ((struct sockaddr *)(dst0+ 1))->sa_family) {
 1883                 KEY_FREESP(&newsp);
 1884                 return key_senderror(so, m, EINVAL);
 1885         }
 1886         if (((struct sockaddr *)(src0 + 1))->sa_len !=
 1887                         ((struct sockaddr *)(dst0+ 1))->sa_len) {
 1888                 KEY_FREESP(&newsp);
 1889                 return key_senderror(so, m, EINVAL);
 1890         }
 1891 #if 1
 1892         if (newsp->req && newsp->req->saidx.src.sa.sa_family &&
 1893             newsp->req->saidx.dst.sa.sa_family) {
 1894                 if (newsp->req->saidx.src.sa.sa_family !=
 1895                     newsp->req->saidx.dst.sa.sa_family) {
 1896                         KEY_FREESP(&newsp);
 1897                         return key_senderror(so, m, EINVAL);
 1898                 }
 1899         }
 1900 #endif
 1901 
 1902         newsp->created = time_second;
 1903         newsp->lastused = newsp->created;
 1904         newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0;
 1905         newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0;
 1906 
 1907         SPTREE_WLOCK();
 1908         TAILQ_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, chain);
 1909         newsp->state = IPSEC_SPSTATE_ALIVE;
 1910         SPTREE_WUNLOCK();
 1911 
 1912         /* delete the entry in spacqtree */
 1913         if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) {
 1914                 struct secspacq *spacq = key_getspacq(&spidx);
 1915                 if (spacq != NULL) {
 1916                         /* reset counter in order to deletion by timehandler. */
 1917                         spacq->created = time_second;
 1918                         spacq->count = 0;
 1919                         SPACQ_UNLOCK();
 1920                 }
 1921         }
 1922 
 1923     {
 1924         struct mbuf *n, *mpolicy;
 1925         struct sadb_msg *newmsg;
 1926         int off;
 1927 
 1928         /*
 1929          * Note: do not send SADB_X_EXT_NAT_T_* here:
 1930          * we are sending traffic endpoints.
 1931          */
 1932 
 1933         /* create new sadb_msg to reply. */
 1934         if (lft) {
 1935                 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED,
 1936                     SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD,
 1937                     SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
 1938         } else {
 1939                 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED,
 1940                     SADB_X_EXT_POLICY,
 1941                     SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
 1942         }
 1943         if (!n)
 1944                 return key_senderror(so, m, ENOBUFS);
 1945 
 1946         if (n->m_len < sizeof(*newmsg)) {
 1947                 n = m_pullup(n, sizeof(*newmsg));
 1948                 if (!n)
 1949                         return key_senderror(so, m, ENOBUFS);
 1950         }
 1951         newmsg = mtod(n, struct sadb_msg *);
 1952         newmsg->sadb_msg_errno = 0;
 1953         newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
 1954 
 1955         off = 0;
 1956         mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)),
 1957             sizeof(*xpl), &off);
 1958         if (mpolicy == NULL) {
 1959                 /* n is already freed */
 1960                 return key_senderror(so, m, ENOBUFS);
 1961         }
 1962         xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off);
 1963         if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) {
 1964                 m_freem(n);
 1965                 return key_senderror(so, m, EINVAL);
 1966         }
 1967         xpl->sadb_x_policy_id = newsp->id;
 1968 
 1969         m_freem(m);
 1970         return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
 1971     }
 1972 }
 1973 
 1974 /*
 1975  * get new policy id.
 1976  * OUT:
 1977  *      0:      failure.
 1978  *      others: success.
 1979  */
 1980 static u_int32_t
 1981 key_getnewspid()
 1982 {
 1983         u_int32_t newid = 0;
 1984         int count = V_key_spi_trycnt;   /* XXX */
 1985         struct secpolicy *sp;
 1986 
 1987         /* when requesting to allocate spi ranged */
 1988         while (count--) {
 1989                 newid = (V_policy_id = (V_policy_id == ~0 ? 1 : V_policy_id + 1));
 1990 
 1991                 if ((sp = key_getspbyid(newid)) == NULL)
 1992                         break;
 1993 
 1994                 KEY_FREESP(&sp);
 1995         }
 1996 
 1997         if (count == 0 || newid == 0) {
 1998                 ipseclog((LOG_DEBUG, "%s: to allocate policy id is failed.\n",
 1999                         __func__));
 2000                 return 0;
 2001         }
 2002 
 2003         return newid;
 2004 }
 2005 
 2006 /*
 2007  * SADB_SPDDELETE processing
 2008  * receive
 2009  *   <base, address(SD), policy(*)>
 2010  * from the user(?), and set SADB_SASTATE_DEAD,
 2011  * and send,
 2012  *   <base, address(SD), policy(*)>
 2013  * to the ikmpd.
 2014  * policy(*) including direction of policy.
 2015  *
 2016  * m will always be freed.
 2017  */
 2018 static int
 2019 key_spddelete(struct socket *so, struct mbuf *m,
 2020     const struct sadb_msghdr *mhp)
 2021 {
 2022         struct sadb_address *src0, *dst0;
 2023         struct sadb_x_policy *xpl0;
 2024         struct secpolicyindex spidx;
 2025         struct secpolicy *sp;
 2026 
 2027         IPSEC_ASSERT(so != NULL, ("null so"));
 2028         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 2029         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 2030         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 2031 
 2032         if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
 2033             mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
 2034             mhp->ext[SADB_X_EXT_POLICY] == NULL) {
 2035                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 2036                         __func__));
 2037                 return key_senderror(so, m, EINVAL);
 2038         }
 2039         if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
 2040             mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) ||
 2041             mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
 2042                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 2043                         __func__));
 2044                 return key_senderror(so, m, EINVAL);
 2045         }
 2046 
 2047         src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
 2048         dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
 2049         xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];
 2050 
 2051         /*
 2052          * Note: do not parse SADB_X_EXT_NAT_T_* here:
 2053          * we are processing traffic endpoints.
 2054          */
 2055 
 2056         /* make secindex */
 2057         /* XXX boundary check against sa_len */
 2058         KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
 2059                         src0 + 1,
 2060                         dst0 + 1,
 2061                         src0->sadb_address_prefixlen,
 2062                         dst0->sadb_address_prefixlen,
 2063                         src0->sadb_address_proto,
 2064                         &spidx);
 2065 
 2066         /* checking the direciton. */
 2067         switch (xpl0->sadb_x_policy_dir) {
 2068         case IPSEC_DIR_INBOUND:
 2069         case IPSEC_DIR_OUTBOUND:
 2070                 break;
 2071         default:
 2072                 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__));
 2073                 return key_senderror(so, m, EINVAL);
 2074         }
 2075 
 2076         /* Is there SP in SPD ? */
 2077         if ((sp = key_getsp(&spidx)) == NULL) {
 2078                 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__));
 2079                 return key_senderror(so, m, EINVAL);
 2080         }
 2081 
 2082         /* save policy id to buffer to be returned. */
 2083         xpl0->sadb_x_policy_id = sp->id;
 2084 
 2085         key_unlink(sp);
 2086         KEY_FREESP(&sp);
 2087 
 2088     {
 2089         struct mbuf *n;
 2090         struct sadb_msg *newmsg;
 2091 
 2092         /*
 2093          * Note: do not send SADB_X_EXT_NAT_T_* here:
 2094          * we are sending traffic endpoints.
 2095          */
 2096 
 2097         /* create new sadb_msg to reply. */
 2098         n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
 2099             SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
 2100         if (!n)
 2101                 return key_senderror(so, m, ENOBUFS);
 2102 
 2103         newmsg = mtod(n, struct sadb_msg *);
 2104         newmsg->sadb_msg_errno = 0;
 2105         newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
 2106 
 2107         m_freem(m);
 2108         return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
 2109     }
 2110 }
 2111 
 2112 /*
 2113  * SADB_SPDDELETE2 processing
 2114  * receive
 2115  *   <base, policy(*)>
 2116  * from the user(?), and set SADB_SASTATE_DEAD,
 2117  * and send,
 2118  *   <base, policy(*)>
 2119  * to the ikmpd.
 2120  * policy(*) including direction of policy.
 2121  *
 2122  * m will always be freed.
 2123  */
 2124 static int
 2125 key_spddelete2(struct socket *so, struct mbuf *m,
 2126     const struct sadb_msghdr *mhp)
 2127 {
 2128         u_int32_t id;
 2129         struct secpolicy *sp;
 2130 
 2131         IPSEC_ASSERT(so != NULL, ("null socket"));
 2132         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 2133         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 2134         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 2135 
 2136         if (mhp->ext[SADB_X_EXT_POLICY] == NULL ||
 2137             mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
 2138                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", __func__));
 2139                 return key_senderror(so, m, EINVAL);
 2140         }
 2141 
 2142         id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;
 2143 
 2144         /* Is there SP in SPD ? */
 2145         if ((sp = key_getspbyid(id)) == NULL) {
 2146                 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id));
 2147                 return key_senderror(so, m, EINVAL);
 2148         }
 2149 
 2150         key_unlink(sp);
 2151         KEY_FREESP(&sp);
 2152 
 2153     {
 2154         struct mbuf *n, *nn;
 2155         struct sadb_msg *newmsg;
 2156         int off, len;
 2157 
 2158         /* create new sadb_msg to reply. */
 2159         len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
 2160 
 2161         MGETHDR(n, M_NOWAIT, MT_DATA);
 2162         if (n && len > MHLEN) {
 2163                 if (!(MCLGET(n, M_NOWAIT))) {
 2164                         m_freem(n);
 2165                         n = NULL;
 2166                 }
 2167         }
 2168         if (!n)
 2169                 return key_senderror(so, m, ENOBUFS);
 2170 
 2171         n->m_len = len;
 2172         n->m_next = NULL;
 2173         off = 0;
 2174 
 2175         m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
 2176         off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
 2177 
 2178         IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)",
 2179                 off, len));
 2180 
 2181         n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY],
 2182             mhp->extlen[SADB_X_EXT_POLICY], M_NOWAIT);
 2183         if (!n->m_next) {
 2184                 m_freem(n);
 2185                 return key_senderror(so, m, ENOBUFS);
 2186         }
 2187 
 2188         n->m_pkthdr.len = 0;
 2189         for (nn = n; nn; nn = nn->m_next)
 2190                 n->m_pkthdr.len += nn->m_len;
 2191 
 2192         newmsg = mtod(n, struct sadb_msg *);
 2193         newmsg->sadb_msg_errno = 0;
 2194         newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
 2195 
 2196         m_freem(m);
 2197         return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
 2198     }
 2199 }
 2200 
 2201 /*
 2202  * SADB_X_GET processing
 2203  * receive
 2204  *   <base, policy(*)>
 2205  * from the user(?),
 2206  * and send,
 2207  *   <base, address(SD), policy>
 2208  * to the ikmpd.
 2209  * policy(*) including direction of policy.
 2210  *
 2211  * m will always be freed.
 2212  */
 2213 static int
 2214 key_spdget(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
 2215 {
 2216         u_int32_t id;
 2217         struct secpolicy *sp;
 2218         struct mbuf *n;
 2219 
 2220         IPSEC_ASSERT(so != NULL, ("null socket"));
 2221         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 2222         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 2223         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 2224 
 2225         if (mhp->ext[SADB_X_EXT_POLICY] == NULL ||
 2226             mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
 2227                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 2228                         __func__));
 2229                 return key_senderror(so, m, EINVAL);
 2230         }
 2231 
 2232         id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;
 2233 
 2234         /* Is there SP in SPD ? */
 2235         if ((sp = key_getspbyid(id)) == NULL) {
 2236                 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id));
 2237                 return key_senderror(so, m, ENOENT);
 2238         }
 2239 
 2240         n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid);
 2241         KEY_FREESP(&sp);
 2242         if (n != NULL) {
 2243                 m_freem(m);
 2244                 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
 2245         } else
 2246                 return key_senderror(so, m, ENOBUFS);
 2247 }
 2248 
 2249 /*
 2250  * SADB_X_SPDACQUIRE processing.
 2251  * Acquire policy and SA(s) for a *OUTBOUND* packet.
 2252  * send
 2253  *   <base, policy(*)>
 2254  * to KMD, and expect to receive
 2255  *   <base> with SADB_X_SPDACQUIRE if error occured,
 2256  * or
 2257  *   <base, policy>
 2258  * with SADB_X_SPDUPDATE from KMD by PF_KEY.
 2259  * policy(*) is without policy requests.
 2260  *
 2261  *    0     : succeed
 2262  *    others: error number
 2263  */
 2264 int
 2265 key_spdacquire(struct secpolicy *sp)
 2266 {
 2267         struct mbuf *result = NULL, *m;
 2268         struct secspacq *newspacq;
 2269 
 2270         IPSEC_ASSERT(sp != NULL, ("null secpolicy"));
 2271         IPSEC_ASSERT(sp->req == NULL, ("policy exists"));
 2272         IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
 2273                 ("policy not IPSEC %u", sp->policy));
 2274 
 2275         /* Get an entry to check whether sent message or not. */
 2276         newspacq = key_getspacq(&sp->spidx);
 2277         if (newspacq != NULL) {
 2278                 if (V_key_blockacq_count < newspacq->count) {
 2279                         /* reset counter and do send message. */
 2280                         newspacq->count = 0;
 2281                 } else {
 2282                         /* increment counter and do nothing. */
 2283                         newspacq->count++;
 2284                         SPACQ_UNLOCK();
 2285                         return (0);
 2286                 }
 2287                 SPACQ_UNLOCK();
 2288         } else {
 2289                 /* make new entry for blocking to send SADB_ACQUIRE. */
 2290                 newspacq = key_newspacq(&sp->spidx);
 2291                 if (newspacq == NULL)
 2292                         return ENOBUFS;
 2293         }
 2294 
 2295         /* create new sadb_msg to reply. */
 2296         m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0);
 2297         if (!m)
 2298                 return ENOBUFS;
 2299 
 2300         result = m;
 2301 
 2302         result->m_pkthdr.len = 0;
 2303         for (m = result; m; m = m->m_next)
 2304                 result->m_pkthdr.len += m->m_len;
 2305 
 2306         mtod(result, struct sadb_msg *)->sadb_msg_len =
 2307             PFKEY_UNIT64(result->m_pkthdr.len);
 2308 
 2309         return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED);
 2310 }
 2311 
 2312 /*
 2313  * SADB_SPDFLUSH processing
 2314  * receive
 2315  *   <base>
 2316  * from the user, and free all entries in secpctree.
 2317  * and send,
 2318  *   <base>
 2319  * to the user.
 2320  * NOTE: what to do is only marking SADB_SASTATE_DEAD.
 2321  *
 2322  * m will always be freed.
 2323  */
 2324 static int
 2325 key_spdflush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
 2326 {
 2327         TAILQ_HEAD(, secpolicy) drainq;
 2328         struct sadb_msg *newmsg;
 2329         struct secpolicy *sp, *nextsp;
 2330         u_int dir;
 2331 
 2332         IPSEC_ASSERT(so != NULL, ("null socket"));
 2333         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 2334         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 2335         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 2336 
 2337         if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg)))
 2338                 return key_senderror(so, m, EINVAL);
 2339 
 2340         TAILQ_INIT(&drainq);
 2341         SPTREE_WLOCK();
 2342         for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
 2343                 TAILQ_CONCAT(&drainq, &V_sptree[dir], chain);
 2344         }
 2345         /*
 2346          * We need to set state to DEAD for each policy to be sure,
 2347          * that another thread won't try to unlink it.
 2348          */
 2349         TAILQ_FOREACH(sp, &drainq, chain)
 2350                 sp->state = IPSEC_SPSTATE_DEAD;
 2351         SPTREE_WUNLOCK();
 2352         sp = TAILQ_FIRST(&drainq);
 2353         while (sp != NULL) {
 2354                 nextsp = TAILQ_NEXT(sp, chain);
 2355                 KEY_FREESP(&sp);
 2356                 sp = nextsp;
 2357         }
 2358 
 2359         if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
 2360                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
 2361                 return key_senderror(so, m, ENOBUFS);
 2362         }
 2363 
 2364         if (m->m_next)
 2365                 m_freem(m->m_next);
 2366         m->m_next = NULL;
 2367         m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
 2368         newmsg = mtod(m, struct sadb_msg *);
 2369         newmsg->sadb_msg_errno = 0;
 2370         newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
 2371 
 2372         return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
 2373 }
 2374 
 2375 /*
 2376  * SADB_SPDDUMP processing
 2377  * receive
 2378  *   <base>
 2379  * from the user, and dump all SP leaves
 2380  * and send,
 2381  *   <base> .....
 2382  * to the ikmpd.
 2383  *
 2384  * m will always be freed.
 2385  */
 2386 static int
 2387 key_spddump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
 2388 {
 2389         SPTREE_RLOCK_TRACKER;
 2390         struct secpolicy *sp;
 2391         int cnt;
 2392         u_int dir;
 2393         struct mbuf *n;
 2394 
 2395         IPSEC_ASSERT(so != NULL, ("null socket"));
 2396         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 2397         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 2398         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 2399 
 2400         /* search SPD entry and get buffer size. */
 2401         cnt = 0;
 2402         SPTREE_RLOCK();
 2403         for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
 2404                 TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
 2405                         cnt++;
 2406                 }
 2407         }
 2408 
 2409         if (cnt == 0) {
 2410                 SPTREE_RUNLOCK();
 2411                 return key_senderror(so, m, ENOENT);
 2412         }
 2413 
 2414         for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
 2415                 TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
 2416                         --cnt;
 2417                         n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt,
 2418                             mhp->msg->sadb_msg_pid);
 2419 
 2420                         if (n)
 2421                                 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
 2422                 }
 2423         }
 2424 
 2425         SPTREE_RUNLOCK();
 2426         m_freem(m);
 2427         return 0;
 2428 }
 2429 
 2430 static struct mbuf *
 2431 key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq,
 2432     u_int32_t pid)
 2433 {
 2434         struct mbuf *result = NULL, *m;
 2435         struct seclifetime lt;
 2436 
 2437         m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt);
 2438         if (!m)
 2439                 goto fail;
 2440         result = m;
 2441 
 2442         /*
 2443          * Note: do not send SADB_X_EXT_NAT_T_* here:
 2444          * we are sending traffic endpoints.
 2445          */
 2446         m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
 2447             &sp->spidx.src.sa, sp->spidx.prefs,
 2448             sp->spidx.ul_proto);
 2449         if (!m)
 2450                 goto fail;
 2451         m_cat(result, m);
 2452 
 2453         m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
 2454             &sp->spidx.dst.sa, sp->spidx.prefd,
 2455             sp->spidx.ul_proto);
 2456         if (!m)
 2457                 goto fail;
 2458         m_cat(result, m);
 2459 
 2460         m = key_sp2msg(sp);
 2461         if (!m)
 2462                 goto fail;
 2463         m_cat(result, m);
 2464 
 2465         if(sp->lifetime){
 2466                 lt.addtime=sp->created;
 2467                 lt.usetime= sp->lastused;
 2468                 m = key_setlifetime(&lt, SADB_EXT_LIFETIME_CURRENT);
 2469                 if (!m)
 2470                         goto fail;
 2471                 m_cat(result, m);
 2472                 
 2473                 lt.addtime=sp->lifetime;
 2474                 lt.usetime= sp->validtime;
 2475                 m = key_setlifetime(&lt, SADB_EXT_LIFETIME_HARD);
 2476                 if (!m)
 2477                         goto fail;
 2478                 m_cat(result, m);
 2479         }
 2480 
 2481         if ((result->m_flags & M_PKTHDR) == 0)
 2482                 goto fail;
 2483 
 2484         if (result->m_len < sizeof(struct sadb_msg)) {
 2485                 result = m_pullup(result, sizeof(struct sadb_msg));
 2486                 if (result == NULL)
 2487                         goto fail;
 2488         }
 2489 
 2490         result->m_pkthdr.len = 0;
 2491         for (m = result; m; m = m->m_next)
 2492                 result->m_pkthdr.len += m->m_len;
 2493 
 2494         mtod(result, struct sadb_msg *)->sadb_msg_len =
 2495             PFKEY_UNIT64(result->m_pkthdr.len);
 2496 
 2497         return result;
 2498 
 2499 fail:
 2500         m_freem(result);
 2501         return NULL;
 2502 }
 2503 
 2504 /*
 2505  * get PFKEY message length for security policy and request.
 2506  */
 2507 static u_int
 2508 key_getspreqmsglen(struct secpolicy *sp)
 2509 {
 2510         u_int tlen;
 2511 
 2512         tlen = sizeof(struct sadb_x_policy);
 2513 
 2514         /* if is the policy for ipsec ? */
 2515         if (sp->policy != IPSEC_POLICY_IPSEC)
 2516                 return tlen;
 2517 
 2518         /* get length of ipsec requests */
 2519     {
 2520         struct ipsecrequest *isr;
 2521         int len;
 2522 
 2523         for (isr = sp->req; isr != NULL; isr = isr->next) {
 2524                 len = sizeof(struct sadb_x_ipsecrequest)
 2525                         + isr->saidx.src.sa.sa_len
 2526                         + isr->saidx.dst.sa.sa_len;
 2527 
 2528                 tlen += PFKEY_ALIGN8(len);
 2529         }
 2530     }
 2531 
 2532         return tlen;
 2533 }
 2534 
 2535 /*
 2536  * SADB_SPDEXPIRE processing
 2537  * send
 2538  *   <base, address(SD), lifetime(CH), policy>
 2539  * to KMD by PF_KEY.
 2540  *
 2541  * OUT: 0       : succeed
 2542  *      others  : error number
 2543  */
 2544 static int
 2545 key_spdexpire(struct secpolicy *sp)
 2546 {
 2547         struct mbuf *result = NULL, *m;
 2548         int len;
 2549         int error = -1;
 2550         struct sadb_lifetime *lt;
 2551 
 2552         /* XXX: Why do we lock ? */
 2553 
 2554         IPSEC_ASSERT(sp != NULL, ("null secpolicy"));
 2555 
 2556         /* set msg header */
 2557         m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0);
 2558         if (!m) {
 2559                 error = ENOBUFS;
 2560                 goto fail;
 2561         }
 2562         result = m;
 2563 
 2564         /* create lifetime extension (current and hard) */
 2565         len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
 2566         m = m_get2(len, M_NOWAIT, MT_DATA, 0);
 2567         if (m == NULL) {
 2568                 error = ENOBUFS;
 2569                 goto fail;
 2570         }
 2571         m_align(m, len);
 2572         m->m_len = len;
 2573         bzero(mtod(m, caddr_t), len);
 2574         lt = mtod(m, struct sadb_lifetime *);
 2575         lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
 2576         lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 2577         lt->sadb_lifetime_allocations = 0;
 2578         lt->sadb_lifetime_bytes = 0;
 2579         lt->sadb_lifetime_addtime = sp->created;
 2580         lt->sadb_lifetime_usetime = sp->lastused;
 2581         lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
 2582         lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
 2583         lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 2584         lt->sadb_lifetime_allocations = 0;
 2585         lt->sadb_lifetime_bytes = 0;
 2586         lt->sadb_lifetime_addtime = sp->lifetime;
 2587         lt->sadb_lifetime_usetime = sp->validtime;
 2588         m_cat(result, m);
 2589 
 2590         /*
 2591          * Note: do not send SADB_X_EXT_NAT_T_* here:
 2592          * we are sending traffic endpoints.
 2593          */
 2594 
 2595         /* set sadb_address for source */
 2596         m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
 2597             &sp->spidx.src.sa,
 2598             sp->spidx.prefs, sp->spidx.ul_proto);
 2599         if (!m) {
 2600                 error = ENOBUFS;
 2601                 goto fail;
 2602         }
 2603         m_cat(result, m);
 2604 
 2605         /* set sadb_address for destination */
 2606         m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
 2607             &sp->spidx.dst.sa,
 2608             sp->spidx.prefd, sp->spidx.ul_proto);
 2609         if (!m) {
 2610                 error = ENOBUFS;
 2611                 goto fail;
 2612         }
 2613         m_cat(result, m);
 2614 
 2615         /* set secpolicy */
 2616         m = key_sp2msg(sp);
 2617         if (!m) {
 2618                 error = ENOBUFS;
 2619                 goto fail;
 2620         }
 2621         m_cat(result, m);
 2622 
 2623         if ((result->m_flags & M_PKTHDR) == 0) {
 2624                 error = EINVAL;
 2625                 goto fail;
 2626         }
 2627 
 2628         if (result->m_len < sizeof(struct sadb_msg)) {
 2629                 result = m_pullup(result, sizeof(struct sadb_msg));
 2630                 if (result == NULL) {
 2631                         error = ENOBUFS;
 2632                         goto fail;
 2633                 }
 2634         }
 2635 
 2636         result->m_pkthdr.len = 0;
 2637         for (m = result; m; m = m->m_next)
 2638                 result->m_pkthdr.len += m->m_len;
 2639 
 2640         mtod(result, struct sadb_msg *)->sadb_msg_len =
 2641             PFKEY_UNIT64(result->m_pkthdr.len);
 2642 
 2643         return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
 2644 
 2645  fail:
 2646         if (result)
 2647                 m_freem(result);
 2648         return error;
 2649 }
 2650 
 2651 /* %%% SAD management */
 2652 /*
 2653  * allocating a memory for new SA head, and copy from the values of mhp.
 2654  * OUT: NULL    : failure due to the lack of memory.
 2655  *      others  : pointer to new SA head.
 2656  */
 2657 static struct secashead *
 2658 key_newsah(struct secasindex *saidx)
 2659 {
 2660         struct secashead *newsah;
 2661 
 2662         IPSEC_ASSERT(saidx != NULL, ("null saidx"));
 2663 
 2664         newsah = malloc(sizeof(struct secashead), M_IPSEC_SAH, M_NOWAIT|M_ZERO);
 2665         if (newsah != NULL) {
 2666                 int i;
 2667                 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++)
 2668                         LIST_INIT(&newsah->savtree[i]);
 2669                 newsah->saidx = *saidx;
 2670 
 2671                 /* add to saidxtree */
 2672                 newsah->state = SADB_SASTATE_MATURE;
 2673 
 2674                 SAHTREE_LOCK();
 2675                 LIST_INSERT_HEAD(&V_sahtree, newsah, chain);
 2676                 SAHTREE_UNLOCK();
 2677         }
 2678         return(newsah);
 2679 }
 2680 
 2681 /*
 2682  * delete SA index and all SA registerd.
 2683  */
 2684 static void
 2685 key_delsah(struct secashead *sah)
 2686 {
 2687         struct secasvar *sav, *nextsav;
 2688         u_int stateidx;
 2689         int zombie = 0;
 2690 
 2691         IPSEC_ASSERT(sah != NULL, ("NULL sah"));
 2692         SAHTREE_LOCK_ASSERT();
 2693 
 2694         /* searching all SA registerd in the secindex. */
 2695         for (stateidx = 0;
 2696              stateidx < _ARRAYLEN(saorder_state_any);
 2697              stateidx++) {
 2698                 u_int state = saorder_state_any[stateidx];
 2699                 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, nextsav) {
 2700                         if (sav->refcnt == 0) {
 2701                                 /* sanity check */
 2702                                 KEY_CHKSASTATE(state, sav->state, __func__);
 2703                                 /* 
 2704                                  * do NOT call KEY_FREESAV here:
 2705                                  * it will only delete the sav if refcnt == 1,
 2706                                  * where we already know that refcnt == 0
 2707                                  */
 2708                                 key_delsav(sav);
 2709                         } else {
 2710                                 /* give up to delete this sa */
 2711                                 zombie++;
 2712                         }
 2713                 }
 2714         }
 2715         if (!zombie) {          /* delete only if there are savs */
 2716                 /* remove from tree of SA index */
 2717                 if (__LIST_CHAINED(sah))
 2718                         LIST_REMOVE(sah, chain);
 2719                 free(sah, M_IPSEC_SAH);
 2720         }
 2721 }
 2722 
 2723 /*
 2724  * allocating a new SA with LARVAL state.  key_add() and key_getspi() call,
 2725  * and copy the values of mhp into new buffer.
 2726  * When SAD message type is GETSPI:
 2727  *      to set sequence number from acq_seq++,
 2728  *      to set zero to SPI.
 2729  *      not to call key_setsava().
 2730  * OUT: NULL    : fail
 2731  *      others  : pointer to new secasvar.
 2732  *
 2733  * does not modify mbuf.  does not free mbuf on error.
 2734  */
 2735 static struct secasvar *
 2736 key_newsav(struct mbuf *m, const struct sadb_msghdr *mhp,
 2737     struct secashead *sah, int *errp, const char *where, int tag)
 2738 {
 2739         struct secasvar *newsav;
 2740         const struct sadb_sa *xsa;
 2741 
 2742         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 2743         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 2744         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 2745         IPSEC_ASSERT(sah != NULL, ("null secashead"));
 2746 
 2747         newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO);
 2748         if (newsav == NULL) {
 2749                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
 2750                 *errp = ENOBUFS;
 2751                 goto done;
 2752         }
 2753 
 2754         switch (mhp->msg->sadb_msg_type) {
 2755         case SADB_GETSPI:
 2756                 newsav->spi = 0;
 2757 
 2758 #ifdef IPSEC_DOSEQCHECK
 2759                 /* sync sequence number */
 2760                 if (mhp->msg->sadb_msg_seq == 0)
 2761                         newsav->seq =
 2762                                 (V_acq_seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq));
 2763                 else
 2764 #endif
 2765                         newsav->seq = mhp->msg->sadb_msg_seq;
 2766                 break;
 2767 
 2768         case SADB_ADD:
 2769                 /* sanity check */
 2770                 if (mhp->ext[SADB_EXT_SA] == NULL) {
 2771                         free(newsav, M_IPSEC_SA);
 2772                         newsav = NULL;
 2773                         ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 2774                                 __func__));
 2775                         *errp = EINVAL;
 2776                         goto done;
 2777                 }
 2778                 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA];
 2779                 newsav->spi = xsa->sadb_sa_spi;
 2780                 newsav->seq = mhp->msg->sadb_msg_seq;
 2781                 break;
 2782         default:
 2783                 free(newsav, M_IPSEC_SA);
 2784                 newsav = NULL;
 2785                 *errp = EINVAL;
 2786                 goto done;
 2787         }
 2788 
 2789 
 2790         /* copy sav values */
 2791         if (mhp->msg->sadb_msg_type != SADB_GETSPI) {
 2792                 *errp = key_setsaval(newsav, m, mhp);
 2793                 if (*errp) {
 2794                         free(newsav, M_IPSEC_SA);
 2795                         newsav = NULL;
 2796                         goto done;
 2797                 }
 2798         }
 2799 
 2800         SECASVAR_LOCK_INIT(newsav);
 2801 
 2802         /* reset created */
 2803         newsav->created = time_second;
 2804         newsav->pid = mhp->msg->sadb_msg_pid;
 2805 
 2806         /* add to satree */
 2807         newsav->sah = sah;
 2808         sa_initref(newsav);
 2809         newsav->state = SADB_SASTATE_LARVAL;
 2810 
 2811         SAHTREE_LOCK();
 2812         LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav,
 2813                         secasvar, chain);
 2814         SAHTREE_UNLOCK();
 2815 done:
 2816         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 2817                 printf("DP %s from %s:%u return SP:%p\n", __func__,
 2818                         where, tag, newsav));
 2819 
 2820         return newsav;
 2821 }
 2822 
 2823 /*
 2824  * free() SA variable entry.
 2825  */
 2826 static void
 2827 key_cleansav(struct secasvar *sav)
 2828 {
 2829         /*
 2830          * Cleanup xform state.  Note that zeroize'ing causes the
 2831          * keys to be cleared; otherwise we must do it ourself.
 2832          */
 2833         if (sav->tdb_xform != NULL) {
 2834                 sav->tdb_xform->xf_zeroize(sav);
 2835                 sav->tdb_xform = NULL;
 2836         } else {
 2837                 KASSERT(sav->iv == NULL, ("iv but no xform"));
 2838                 if (sav->key_auth != NULL)
 2839                         bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth));
 2840                 if (sav->key_enc != NULL)
 2841                         bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc));
 2842         }
 2843         if (sav->key_auth != NULL) {
 2844                 if (sav->key_auth->key_data != NULL)
 2845                         free(sav->key_auth->key_data, M_IPSEC_MISC);
 2846                 free(sav->key_auth, M_IPSEC_MISC);
 2847                 sav->key_auth = NULL;
 2848         }
 2849         if (sav->key_enc != NULL) {
 2850                 if (sav->key_enc->key_data != NULL)
 2851                         free(sav->key_enc->key_data, M_IPSEC_MISC);
 2852                 free(sav->key_enc, M_IPSEC_MISC);
 2853                 sav->key_enc = NULL;
 2854         }
 2855         if (sav->sched) {
 2856                 bzero(sav->sched, sav->schedlen);
 2857                 free(sav->sched, M_IPSEC_MISC);
 2858                 sav->sched = NULL;
 2859         }
 2860         if (sav->replay != NULL) {
 2861                 free(sav->replay, M_IPSEC_MISC);
 2862                 sav->replay = NULL;
 2863         }
 2864         if (sav->lft_c != NULL) {
 2865                 free(sav->lft_c, M_IPSEC_MISC);
 2866                 sav->lft_c = NULL;
 2867         }
 2868         if (sav->lft_h != NULL) {
 2869                 free(sav->lft_h, M_IPSEC_MISC);
 2870                 sav->lft_h = NULL;
 2871         }
 2872         if (sav->lft_s != NULL) {
 2873                 free(sav->lft_s, M_IPSEC_MISC);
 2874                 sav->lft_s = NULL;
 2875         }
 2876 }
 2877 
 2878 /*
 2879  * free() SA variable entry.
 2880  */
 2881 static void
 2882 key_delsav(struct secasvar *sav)
 2883 {
 2884         IPSEC_ASSERT(sav != NULL, ("null sav"));
 2885         IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt));
 2886 
 2887         /* remove from SA header */
 2888         if (__LIST_CHAINED(sav))
 2889                 LIST_REMOVE(sav, chain);
 2890         key_cleansav(sav);
 2891         SECASVAR_LOCK_DESTROY(sav);
 2892         free(sav, M_IPSEC_SA);
 2893 }
 2894 
 2895 /*
 2896  * search SAD.
 2897  * OUT:
 2898  *      NULL    : not found
 2899  *      others  : found, pointer to a SA.
 2900  */
 2901 static struct secashead *
 2902 key_getsah(struct secasindex *saidx)
 2903 {
 2904         struct secashead *sah;
 2905 
 2906         SAHTREE_LOCK();
 2907         LIST_FOREACH(sah, &V_sahtree, chain) {
 2908                 if (sah->state == SADB_SASTATE_DEAD)
 2909                         continue;
 2910                 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID))
 2911                         break;
 2912         }
 2913         SAHTREE_UNLOCK();
 2914 
 2915         return sah;
 2916 }
 2917 
 2918 /*
 2919  * check not to be duplicated SPI.
 2920  * NOTE: this function is too slow due to searching all SAD.
 2921  * OUT:
 2922  *      NULL    : not found
 2923  *      others  : found, pointer to a SA.
 2924  */
 2925 static struct secasvar *
 2926 key_checkspidup(struct secasindex *saidx, u_int32_t spi)
 2927 {
 2928         struct secashead *sah;
 2929         struct secasvar *sav;
 2930 
 2931         /* check address family */
 2932         if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) {
 2933                 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n",
 2934                         __func__));
 2935                 return NULL;
 2936         }
 2937 
 2938         sav = NULL;
 2939         /* check all SAD */
 2940         SAHTREE_LOCK();
 2941         LIST_FOREACH(sah, &V_sahtree, chain) {
 2942                 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst))
 2943                         continue;
 2944                 sav = key_getsavbyspi(sah, spi);
 2945                 if (sav != NULL)
 2946                         break;
 2947         }
 2948         SAHTREE_UNLOCK();
 2949 
 2950         return sav;
 2951 }
 2952 
 2953 /*
 2954  * search SAD litmited alive SA, protocol, SPI.
 2955  * OUT:
 2956  *      NULL    : not found
 2957  *      others  : found, pointer to a SA.
 2958  */
 2959 static struct secasvar *
 2960 key_getsavbyspi(struct secashead *sah, u_int32_t spi)
 2961 {
 2962         struct secasvar *sav;
 2963         u_int stateidx, state;
 2964 
 2965         sav = NULL;
 2966         SAHTREE_LOCK_ASSERT();
 2967         /* search all status */
 2968         for (stateidx = 0;
 2969              stateidx < _ARRAYLEN(saorder_state_alive);
 2970              stateidx++) {
 2971 
 2972                 state = saorder_state_alive[stateidx];
 2973                 LIST_FOREACH(sav, &sah->savtree[state], chain) {
 2974 
 2975                         /* sanity check */
 2976                         if (sav->state != state) {
 2977                                 ipseclog((LOG_DEBUG, "%s: "
 2978                                     "invalid sav->state (queue: %d SA: %d)\n",
 2979                                     __func__, state, sav->state));
 2980                                 continue;
 2981                         }
 2982 
 2983                         if (sav->spi == spi)
 2984                                 return sav;
 2985                 }
 2986         }
 2987 
 2988         return NULL;
 2989 }
 2990 
 2991 /*
 2992  * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*.
 2993  * You must update these if need.
 2994  * OUT: 0:      success.
 2995  *      !0:     failure.
 2996  *
 2997  * does not modify mbuf.  does not free mbuf on error.
 2998  */
 2999 static int
 3000 key_setsaval(struct secasvar *sav, struct mbuf *m,
 3001     const struct sadb_msghdr *mhp)
 3002 {
 3003         int error = 0;
 3004 
 3005         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 3006         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 3007         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 3008 
 3009         /* initialization */
 3010         sav->replay = NULL;
 3011         sav->key_auth = NULL;
 3012         sav->key_enc = NULL;
 3013         sav->sched = NULL;
 3014         sav->schedlen = 0;
 3015         sav->iv = NULL;
 3016         sav->lft_c = NULL;
 3017         sav->lft_h = NULL;
 3018         sav->lft_s = NULL;
 3019         sav->tdb_xform = NULL;          /* transform */
 3020         sav->tdb_encalgxform = NULL;    /* encoding algorithm */
 3021         sav->tdb_authalgxform = NULL;   /* authentication algorithm */
 3022         sav->tdb_compalgxform = NULL;   /* compression algorithm */
 3023         /*  Initialize even if NAT-T not compiled in: */
 3024         sav->natt_type = 0;
 3025         sav->natt_esp_frag_len = 0;
 3026 
 3027         /* SA */
 3028         if (mhp->ext[SADB_EXT_SA] != NULL) {
 3029                 const struct sadb_sa *sa0;
 3030 
 3031                 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA];
 3032                 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) {
 3033                         error = EINVAL;
 3034                         goto fail;
 3035                 }
 3036 
 3037                 sav->alg_auth = sa0->sadb_sa_auth;
 3038                 sav->alg_enc = sa0->sadb_sa_encrypt;
 3039                 sav->flags = sa0->sadb_sa_flags;
 3040 
 3041                 /* replay window */
 3042                 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) {
 3043                         sav->replay = (struct secreplay *)
 3044                                 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO);
 3045                         if (sav->replay == NULL) {
 3046                                 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
 3047                                         __func__));
 3048                                 error = ENOBUFS;
 3049                                 goto fail;
 3050                         }
 3051                         if (sa0->sadb_sa_replay != 0)
 3052                                 sav->replay->bitmap = (caddr_t)(sav->replay+1);
 3053                         sav->replay->wsize = sa0->sadb_sa_replay;
 3054                 }
 3055         }
 3056 
 3057         /* Authentication keys */
 3058         if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) {
 3059                 const struct sadb_key *key0;
 3060                 int len;
 3061 
 3062                 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH];
 3063                 len = mhp->extlen[SADB_EXT_KEY_AUTH];
 3064 
 3065                 error = 0;
 3066                 if (len < sizeof(*key0)) {
 3067                         error = EINVAL;
 3068                         goto fail;
 3069                 }
 3070                 switch (mhp->msg->sadb_msg_satype) {
 3071                 case SADB_SATYPE_AH:
 3072                 case SADB_SATYPE_ESP:
 3073                 case SADB_X_SATYPE_TCPSIGNATURE:
 3074                         if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
 3075                             sav->alg_auth != SADB_X_AALG_NULL)
 3076                                 error = EINVAL;
 3077                         break;
 3078                 case SADB_X_SATYPE_IPCOMP:
 3079                 default:
 3080                         error = EINVAL;
 3081                         break;
 3082                 }
 3083                 if (error) {
 3084                         ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n",
 3085                                 __func__));
 3086                         goto fail;
 3087                 }
 3088 
 3089                 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len,
 3090                                                                 M_IPSEC_MISC);
 3091                 if (sav->key_auth == NULL ) {
 3092                         ipseclog((LOG_DEBUG, "%s: No more memory.\n",
 3093                                   __func__));
 3094                         error = ENOBUFS;
 3095                         goto fail;
 3096                 }
 3097         }
 3098 
 3099         /* Encryption key */
 3100         if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) {
 3101                 const struct sadb_key *key0;
 3102                 int len;
 3103 
 3104                 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT];
 3105                 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT];
 3106 
 3107                 error = 0;
 3108                 if (len < sizeof(*key0)) {
 3109                         error = EINVAL;
 3110                         goto fail;
 3111                 }
 3112                 switch (mhp->msg->sadb_msg_satype) {
 3113                 case SADB_SATYPE_ESP:
 3114                         if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
 3115                             sav->alg_enc != SADB_EALG_NULL) {
 3116                                 error = EINVAL;
 3117                                 break;
 3118                         }
 3119                         sav->key_enc = (struct seckey *)key_dup_keymsg(key0,
 3120                                                                        len,
 3121                                                                        M_IPSEC_MISC);
 3122                         if (sav->key_enc == NULL) {
 3123                                 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
 3124                                         __func__));
 3125                                 error = ENOBUFS;
 3126                                 goto fail;
 3127                         }
 3128                         break;
 3129                 case SADB_X_SATYPE_IPCOMP:
 3130                         if (len != PFKEY_ALIGN8(sizeof(struct sadb_key)))
 3131                                 error = EINVAL;
 3132                         sav->key_enc = NULL;    /*just in case*/
 3133                         break;
 3134                 case SADB_SATYPE_AH:
 3135                 case SADB_X_SATYPE_TCPSIGNATURE:
 3136                 default:
 3137                         error = EINVAL;
 3138                         break;
 3139                 }
 3140                 if (error) {
 3141                         ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n",
 3142                                 __func__));
 3143                         goto fail;
 3144                 }
 3145         }
 3146 
 3147         /* set iv */
 3148         sav->ivlen = 0;
 3149 
 3150         switch (mhp->msg->sadb_msg_satype) {
 3151         case SADB_SATYPE_AH:
 3152                 error = xform_init(sav, XF_AH);
 3153                 break;
 3154         case SADB_SATYPE_ESP:
 3155                 error = xform_init(sav, XF_ESP);
 3156                 break;
 3157         case SADB_X_SATYPE_IPCOMP:
 3158                 error = xform_init(sav, XF_IPCOMP);
 3159                 break;
 3160         case SADB_X_SATYPE_TCPSIGNATURE:
 3161                 error = xform_init(sav, XF_TCPSIGNATURE);
 3162                 break;
 3163         }
 3164         if (error) {
 3165                 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n",
 3166                         __func__, mhp->msg->sadb_msg_satype));
 3167                 goto fail;
 3168         }
 3169 
 3170         /* reset created */
 3171         sav->created = time_second;
 3172 
 3173         /* make lifetime for CURRENT */
 3174         sav->lft_c = malloc(sizeof(struct seclifetime), M_IPSEC_MISC, M_NOWAIT);
 3175         if (sav->lft_c == NULL) {
 3176                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
 3177                 error = ENOBUFS;
 3178                 goto fail;
 3179         }
 3180 
 3181         sav->lft_c->allocations = 0;
 3182         sav->lft_c->bytes = 0;
 3183         sav->lft_c->addtime = time_second;
 3184         sav->lft_c->usetime = 0;
 3185 
 3186         /* lifetimes for HARD and SOFT */
 3187     {
 3188         const struct sadb_lifetime *lft0;
 3189 
 3190         lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD];
 3191         if (lft0 != NULL) {
 3192                 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) {
 3193                         error = EINVAL;
 3194                         goto fail;
 3195                 }
 3196                 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC);
 3197                 if (sav->lft_h == NULL) {
 3198                         ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__));
 3199                         error = ENOBUFS;
 3200                         goto fail;
 3201                 }
 3202                 /* to be initialize ? */
 3203         }
 3204 
 3205         lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT];
 3206         if (lft0 != NULL) {
 3207                 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) {
 3208                         error = EINVAL;
 3209                         goto fail;
 3210                 }
 3211                 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC);
 3212                 if (sav->lft_s == NULL) {
 3213                         ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__));
 3214                         error = ENOBUFS;
 3215                         goto fail;
 3216                 }
 3217                 /* to be initialize ? */
 3218         }
 3219     }
 3220 
 3221         return 0;
 3222 
 3223  fail:
 3224         /* initialization */
 3225         key_cleansav(sav);
 3226 
 3227         return error;
 3228 }
 3229 
 3230 /*
 3231  * validation with a secasvar entry, and set SADB_SATYPE_MATURE.
 3232  * OUT: 0:      valid
 3233  *      other:  errno
 3234  */
 3235 static int
 3236 key_mature(struct secasvar *sav)
 3237 {
 3238         int error;
 3239 
 3240         /* check SPI value */
 3241         switch (sav->sah->saidx.proto) {
 3242         case IPPROTO_ESP:
 3243         case IPPROTO_AH:
 3244                 /*
 3245                  * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values
 3246                  * 1-255 reserved by IANA for future use,
 3247                  * 0 for implementation specific, local use.
 3248                  */
 3249                 if (ntohl(sav->spi) <= 255) {
 3250                         ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n",
 3251                             __func__, (u_int32_t)ntohl(sav->spi)));
 3252                         return EINVAL;
 3253                 }
 3254                 break;
 3255         }
 3256 
 3257         /* check satype */
 3258         switch (sav->sah->saidx.proto) {
 3259         case IPPROTO_ESP:
 3260                 /* check flags */
 3261                 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) ==
 3262                     (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) {
 3263                         ipseclog((LOG_DEBUG, "%s: invalid flag (derived) "
 3264                                 "given to old-esp.\n", __func__));
 3265                         return EINVAL;
 3266                 }
 3267                 error = xform_init(sav, XF_ESP);
 3268                 break;
 3269         case IPPROTO_AH:
 3270                 /* check flags */
 3271                 if (sav->flags & SADB_X_EXT_DERIV) {
 3272                         ipseclog((LOG_DEBUG, "%s: invalid flag (derived) "
 3273                                 "given to AH SA.\n", __func__));
 3274                         return EINVAL;
 3275                 }
 3276                 if (sav->alg_enc != SADB_EALG_NONE) {
 3277                         ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
 3278                                 "mismated.\n", __func__));
 3279                         return(EINVAL);
 3280                 }
 3281                 error = xform_init(sav, XF_AH);
 3282                 break;
 3283         case IPPROTO_IPCOMP:
 3284                 if (sav->alg_auth != SADB_AALG_NONE) {
 3285                         ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
 3286                                 "mismated.\n", __func__));
 3287                         return(EINVAL);
 3288                 }
 3289                 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0
 3290                  && ntohl(sav->spi) >= 0x10000) {
 3291                         ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n",
 3292                                 __func__));
 3293                         return(EINVAL);
 3294                 }
 3295                 error = xform_init(sav, XF_IPCOMP);
 3296                 break;
 3297         case IPPROTO_TCP:
 3298                 if (sav->alg_enc != SADB_EALG_NONE) {
 3299                         ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
 3300                                 "mismated.\n", __func__));
 3301                         return(EINVAL);
 3302                 }
 3303                 error = xform_init(sav, XF_TCPSIGNATURE);
 3304                 break;
 3305         default:
 3306                 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__));
 3307                 error = EPROTONOSUPPORT;
 3308                 break;
 3309         }
 3310         if (error == 0) {
 3311                 SAHTREE_LOCK();
 3312                 key_sa_chgstate(sav, SADB_SASTATE_MATURE);
 3313                 SAHTREE_UNLOCK();
 3314         }
 3315         return (error);
 3316 }
 3317 
 3318 /*
 3319  * subroutine for SADB_GET and SADB_DUMP.
 3320  */
 3321 static struct mbuf *
 3322 key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype,
 3323     u_int32_t seq, u_int32_t pid)
 3324 {
 3325         struct mbuf *result = NULL, *tres = NULL, *m;
 3326         int i;
 3327         int dumporder[] = {
 3328                 SADB_EXT_SA, SADB_X_EXT_SA2,
 3329                 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
 3330                 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC,
 3331                 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH,
 3332                 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC,
 3333                 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY,
 3334 #ifdef IPSEC_NAT_T
 3335                 SADB_X_EXT_NAT_T_TYPE,
 3336                 SADB_X_EXT_NAT_T_SPORT, SADB_X_EXT_NAT_T_DPORT,
 3337                 SADB_X_EXT_NAT_T_OAI, SADB_X_EXT_NAT_T_OAR,
 3338                 SADB_X_EXT_NAT_T_FRAG,
 3339 #endif
 3340         };
 3341 
 3342         m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt);
 3343         if (m == NULL)
 3344                 goto fail;
 3345         result = m;
 3346 
 3347         for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) {
 3348                 m = NULL;
 3349                 switch (dumporder[i]) {
 3350                 case SADB_EXT_SA:
 3351                         m = key_setsadbsa(sav);
 3352                         if (!m)
 3353                                 goto fail;
 3354                         break;
 3355 
 3356                 case SADB_X_EXT_SA2:
 3357                         m = key_setsadbxsa2(sav->sah->saidx.mode,
 3358                                         sav->replay ? sav->replay->count : 0,
 3359                                         sav->sah->saidx.reqid);
 3360                         if (!m)
 3361                                 goto fail;
 3362                         break;
 3363 
 3364                 case SADB_EXT_ADDRESS_SRC:
 3365                         m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
 3366                             &sav->sah->saidx.src.sa,
 3367                             FULLMASK, IPSEC_ULPROTO_ANY);
 3368                         if (!m)
 3369                                 goto fail;
 3370                         break;
 3371 
 3372                 case SADB_EXT_ADDRESS_DST:
 3373                         m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
 3374                             &sav->sah->saidx.dst.sa,
 3375                             FULLMASK, IPSEC_ULPROTO_ANY);
 3376                         if (!m)
 3377                                 goto fail;
 3378                         break;
 3379 
 3380                 case SADB_EXT_KEY_AUTH:
 3381                         if (!sav->key_auth)
 3382                                 continue;
 3383                         m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH);
 3384                         if (!m)
 3385                                 goto fail;
 3386                         break;
 3387 
 3388                 case SADB_EXT_KEY_ENCRYPT:
 3389                         if (!sav->key_enc)
 3390                                 continue;
 3391                         m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT);
 3392                         if (!m)
 3393                                 goto fail;
 3394                         break;
 3395 
 3396                 case SADB_EXT_LIFETIME_CURRENT:
 3397                         if (!sav->lft_c)
 3398                                 continue;
 3399                         m = key_setlifetime(sav->lft_c, 
 3400                                             SADB_EXT_LIFETIME_CURRENT);
 3401                         if (!m)
 3402                                 goto fail;
 3403                         break;
 3404 
 3405                 case SADB_EXT_LIFETIME_HARD:
 3406                         if (!sav->lft_h)
 3407                                 continue;
 3408                         m = key_setlifetime(sav->lft_h, 
 3409                                             SADB_EXT_LIFETIME_HARD);
 3410                         if (!m)
 3411                                 goto fail;
 3412                         break;
 3413 
 3414                 case SADB_EXT_LIFETIME_SOFT:
 3415                         if (!sav->lft_s)
 3416                                 continue;
 3417                         m = key_setlifetime(sav->lft_s, 
 3418                                             SADB_EXT_LIFETIME_SOFT);
 3419 
 3420                         if (!m)
 3421                                 goto fail;
 3422                         break;
 3423 
 3424 #ifdef IPSEC_NAT_T
 3425                 case SADB_X_EXT_NAT_T_TYPE:
 3426                         m = key_setsadbxtype(sav->natt_type);
 3427                         if (!m)
 3428                                 goto fail;
 3429                         break;
 3430                 
 3431                 case SADB_X_EXT_NAT_T_DPORT:
 3432                         m = key_setsadbxport(
 3433                             KEY_PORTFROMSADDR(&sav->sah->saidx.dst),
 3434                             SADB_X_EXT_NAT_T_DPORT);
 3435                         if (!m)
 3436                                 goto fail;
 3437                         break;
 3438 
 3439                 case SADB_X_EXT_NAT_T_SPORT:
 3440                         m = key_setsadbxport(
 3441                             KEY_PORTFROMSADDR(&sav->sah->saidx.src),
 3442                             SADB_X_EXT_NAT_T_SPORT);
 3443                         if (!m)
 3444                                 goto fail;
 3445                         break;
 3446 
 3447                 case SADB_X_EXT_NAT_T_OAI:
 3448                 case SADB_X_EXT_NAT_T_OAR:
 3449                 case SADB_X_EXT_NAT_T_FRAG:
 3450                         /* We do not (yet) support those. */
 3451                         continue;
 3452 #endif
 3453 
 3454                 case SADB_EXT_ADDRESS_PROXY:
 3455                 case SADB_EXT_IDENTITY_SRC:
 3456                 case SADB_EXT_IDENTITY_DST:
 3457                         /* XXX: should we brought from SPD ? */
 3458                 case SADB_EXT_SENSITIVITY:
 3459                 default:
 3460                         continue;
 3461                 }
 3462 
 3463                 if (!m)
 3464                         goto fail;
 3465                 if (tres)
 3466                         m_cat(m, tres);
 3467                 tres = m;
 3468                   
 3469         }
 3470 
 3471         m_cat(result, tres);
 3472         if (result->m_len < sizeof(struct sadb_msg)) {
 3473                 result = m_pullup(result, sizeof(struct sadb_msg));
 3474                 if (result == NULL)
 3475                         goto fail;
 3476         }
 3477 
 3478         result->m_pkthdr.len = 0;
 3479         for (m = result; m; m = m->m_next)
 3480                 result->m_pkthdr.len += m->m_len;
 3481 
 3482         mtod(result, struct sadb_msg *)->sadb_msg_len =
 3483             PFKEY_UNIT64(result->m_pkthdr.len);
 3484 
 3485         return result;
 3486 
 3487 fail:
 3488         m_freem(result);
 3489         m_freem(tres);
 3490         return NULL;
 3491 }
 3492 
 3493 /*
 3494  * set data into sadb_msg.
 3495  */
 3496 static struct mbuf *
 3497 key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq,
 3498     pid_t pid, u_int16_t reserved)
 3499 {
 3500         struct mbuf *m;
 3501         struct sadb_msg *p;
 3502         int len;
 3503 
 3504         len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
 3505         if (len > MCLBYTES)
 3506                 return NULL;
 3507         MGETHDR(m, M_NOWAIT, MT_DATA);
 3508         if (m && len > MHLEN) {
 3509                 if (!(MCLGET(m, M_NOWAIT))) {
 3510                         m_freem(m);
 3511                         m = NULL;
 3512                 }
 3513         }
 3514         if (!m)
 3515                 return NULL;
 3516         m->m_pkthdr.len = m->m_len = len;
 3517         m->m_next = NULL;
 3518 
 3519         p = mtod(m, struct sadb_msg *);
 3520 
 3521         bzero(p, len);
 3522         p->sadb_msg_version = PF_KEY_V2;
 3523         p->sadb_msg_type = type;
 3524         p->sadb_msg_errno = 0;
 3525         p->sadb_msg_satype = satype;
 3526         p->sadb_msg_len = PFKEY_UNIT64(tlen);
 3527         p->sadb_msg_reserved = reserved;
 3528         p->sadb_msg_seq = seq;
 3529         p->sadb_msg_pid = (u_int32_t)pid;
 3530 
 3531         return m;
 3532 }
 3533 
 3534 /*
 3535  * copy secasvar data into sadb_address.
 3536  */
 3537 static struct mbuf *
 3538 key_setsadbsa(struct secasvar *sav)
 3539 {
 3540         struct mbuf *m;
 3541         struct sadb_sa *p;
 3542         int len;
 3543 
 3544         len = PFKEY_ALIGN8(sizeof(struct sadb_sa));
 3545         m = m_get2(len, M_NOWAIT, MT_DATA, 0);
 3546         if (m == NULL)
 3547                 return (NULL);
 3548         m_align(m, len);
 3549         m->m_len = len;
 3550         p = mtod(m, struct sadb_sa *);
 3551         bzero(p, len);
 3552         p->sadb_sa_len = PFKEY_UNIT64(len);
 3553         p->sadb_sa_exttype = SADB_EXT_SA;
 3554         p->sadb_sa_spi = sav->spi;
 3555         p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0);
 3556         p->sadb_sa_state = sav->state;
 3557         p->sadb_sa_auth = sav->alg_auth;
 3558         p->sadb_sa_encrypt = sav->alg_enc;
 3559         p->sadb_sa_flags = sav->flags;
 3560 
 3561         return m;
 3562 }
 3563 
 3564 /*
 3565  * set data into sadb_address.
 3566  */
 3567 static struct mbuf *
 3568 key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr,
 3569     u_int8_t prefixlen, u_int16_t ul_proto)
 3570 {
 3571         struct mbuf *m;
 3572         struct sadb_address *p;
 3573         size_t len;
 3574 
 3575         len = PFKEY_ALIGN8(sizeof(struct sadb_address)) +
 3576             PFKEY_ALIGN8(saddr->sa_len);
 3577         m = m_get2(len, M_NOWAIT, MT_DATA, 0);
 3578         if (m == NULL)
 3579                 return (NULL);
 3580         m_align(m, len);
 3581         m->m_len = len;
 3582         p = mtod(m, struct sadb_address *);
 3583 
 3584         bzero(p, len);
 3585         p->sadb_address_len = PFKEY_UNIT64(len);
 3586         p->sadb_address_exttype = exttype;
 3587         p->sadb_address_proto = ul_proto;
 3588         if (prefixlen == FULLMASK) {
 3589                 switch (saddr->sa_family) {
 3590                 case AF_INET:
 3591                         prefixlen = sizeof(struct in_addr) << 3;
 3592                         break;
 3593                 case AF_INET6:
 3594                         prefixlen = sizeof(struct in6_addr) << 3;
 3595                         break;
 3596                 default:
 3597                         ; /*XXX*/
 3598                 }
 3599         }
 3600         p->sadb_address_prefixlen = prefixlen;
 3601         p->sadb_address_reserved = 0;
 3602 
 3603         bcopy(saddr,
 3604             mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)),
 3605             saddr->sa_len);
 3606 
 3607         return m;
 3608 }
 3609 
 3610 /*
 3611  * set data into sadb_x_sa2.
 3612  */
 3613 static struct mbuf *
 3614 key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid)
 3615 {
 3616         struct mbuf *m;
 3617         struct sadb_x_sa2 *p;
 3618         size_t len;
 3619 
 3620         len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2));
 3621         m = m_get2(len, M_NOWAIT, MT_DATA, 0);
 3622         if (m == NULL)
 3623                 return (NULL);
 3624         m_align(m, len);
 3625         m->m_len = len;
 3626         p = mtod(m, struct sadb_x_sa2 *);
 3627 
 3628         bzero(p, len);
 3629         p->sadb_x_sa2_len = PFKEY_UNIT64(len);
 3630         p->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 3631         p->sadb_x_sa2_mode = mode;
 3632         p->sadb_x_sa2_reserved1 = 0;
 3633         p->sadb_x_sa2_reserved2 = 0;
 3634         p->sadb_x_sa2_sequence = seq;
 3635         p->sadb_x_sa2_reqid = reqid;
 3636 
 3637         return m;
 3638 }
 3639 
 3640 #ifdef IPSEC_NAT_T
 3641 /*
 3642  * Set a type in sadb_x_nat_t_type.
 3643  */
 3644 static struct mbuf *
 3645 key_setsadbxtype(u_int16_t type)
 3646 {
 3647         struct mbuf *m;
 3648         size_t len;
 3649         struct sadb_x_nat_t_type *p;
 3650 
 3651         len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_type));
 3652 
 3653         m = m_get2(len, M_NOWAIT, MT_DATA, 0);
 3654         if (m == NULL)
 3655                 return (NULL);
 3656         m_align(m, len);
 3657         m->m_len = len;
 3658         p = mtod(m, struct sadb_x_nat_t_type *);
 3659 
 3660         bzero(p, len);
 3661         p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len);
 3662         p->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
 3663         p->sadb_x_nat_t_type_type = type;
 3664 
 3665         return (m);
 3666 }
 3667 /*
 3668  * Set a port in sadb_x_nat_t_port.
 3669  * In contrast to default RFC 2367 behaviour, port is in network byte order.
 3670  */
 3671 static struct mbuf *
 3672 key_setsadbxport(u_int16_t port, u_int16_t type)
 3673 {
 3674         struct mbuf *m;
 3675         size_t len;
 3676         struct sadb_x_nat_t_port *p;
 3677 
 3678         len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_port));
 3679 
 3680         m = m_get2(len, M_NOWAIT, MT_DATA, 0);
 3681         if (m == NULL)
 3682                 return (NULL);
 3683         m_align(m, len);
 3684         m->m_len = len;
 3685         p = mtod(m, struct sadb_x_nat_t_port *);
 3686 
 3687         bzero(p, len);
 3688         p->sadb_x_nat_t_port_len = PFKEY_UNIT64(len);
 3689         p->sadb_x_nat_t_port_exttype = type;
 3690         p->sadb_x_nat_t_port_port = port;
 3691 
 3692         return (m);
 3693 }
 3694 
 3695 /* 
 3696  * Get port from sockaddr. Port is in network byte order.
 3697  */
 3698 u_int16_t
 3699 key_portfromsaddr(struct sockaddr *sa)
 3700 {
 3701 
 3702         switch (sa->sa_family) {
 3703 #ifdef INET
 3704         case AF_INET:
 3705                 return ((struct sockaddr_in *)sa)->sin_port;
 3706 #endif
 3707 #ifdef INET6
 3708         case AF_INET6:
 3709                 return ((struct sockaddr_in6 *)sa)->sin6_port;
 3710 #endif
 3711         }
 3712         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 3713                 printf("DP %s unexpected address family %d\n",
 3714                         __func__, sa->sa_family));
 3715         return (0);
 3716 }
 3717 #endif /* IPSEC_NAT_T */
 3718 
 3719 /*
 3720  * Set port in struct sockaddr. Port is in network byte order.
 3721  */
 3722 static void
 3723 key_porttosaddr(struct sockaddr *sa, u_int16_t port)
 3724 {
 3725 
 3726         switch (sa->sa_family) {
 3727 #ifdef INET
 3728         case AF_INET:
 3729                 ((struct sockaddr_in *)sa)->sin_port = port;
 3730                 break;
 3731 #endif
 3732 #ifdef INET6
 3733         case AF_INET6:
 3734                 ((struct sockaddr_in6 *)sa)->sin6_port = port;
 3735                 break;
 3736 #endif
 3737         default:
 3738                 ipseclog((LOG_DEBUG, "%s: unexpected address family %d.\n",
 3739                         __func__, sa->sa_family));
 3740                 break;
 3741         }
 3742 }
 3743 
 3744 /*
 3745  * set data into sadb_x_policy
 3746  */
 3747 static struct mbuf *
 3748 key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id)
 3749 {
 3750         struct mbuf *m;
 3751         struct sadb_x_policy *p;
 3752         size_t len;
 3753 
 3754         len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy));
 3755         m = m_get2(len, M_NOWAIT, MT_DATA, 0);
 3756         if (m == NULL)
 3757                 return (NULL);
 3758         m_align(m, len);
 3759         m->m_len = len;
 3760         p = mtod(m, struct sadb_x_policy *);
 3761 
 3762         bzero(p, len);
 3763         p->sadb_x_policy_len = PFKEY_UNIT64(len);
 3764         p->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
 3765         p->sadb_x_policy_type = type;
 3766         p->sadb_x_policy_dir = dir;
 3767         p->sadb_x_policy_id = id;
 3768 
 3769         return m;
 3770 }
 3771 
 3772 /* %%% utilities */
 3773 /* Take a key message (sadb_key) from the socket and turn it into one
 3774  * of the kernel's key structures (seckey).
 3775  *
 3776  * IN: pointer to the src
 3777  * OUT: NULL no more memory
 3778  */
 3779 struct seckey *
 3780 key_dup_keymsg(const struct sadb_key *src, u_int len,
 3781     struct malloc_type *type)
 3782 {
 3783         struct seckey *dst;
 3784         dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT);
 3785         if (dst != NULL) {
 3786                 dst->bits = src->sadb_key_bits;
 3787                 dst->key_data = (char *)malloc(len, type, M_NOWAIT);
 3788                 if (dst->key_data != NULL) {
 3789                         bcopy((const char *)src + sizeof(struct sadb_key), 
 3790                               dst->key_data, len);
 3791                 } else {
 3792                         ipseclog((LOG_DEBUG, "%s: No more memory.\n", 
 3793                                   __func__));
 3794                         free(dst, type);
 3795                         dst = NULL;
 3796                 }
 3797         } else {
 3798                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 
 3799                           __func__));
 3800 
 3801         }
 3802         return dst;
 3803 }
 3804 
 3805 /* Take a lifetime message (sadb_lifetime) passed in on a socket and
 3806  * turn it into one of the kernel's lifetime structures (seclifetime).
 3807  *
 3808  * IN: pointer to the destination, source and malloc type
 3809  * OUT: NULL, no more memory
 3810  */
 3811 
 3812 static struct seclifetime *
 3813 key_dup_lifemsg(const struct sadb_lifetime *src, struct malloc_type *type)
 3814 {
 3815         struct seclifetime *dst = NULL;
 3816 
 3817         dst = (struct seclifetime *)malloc(sizeof(struct seclifetime), 
 3818                                            type, M_NOWAIT);
 3819         if (dst == NULL) {
 3820                 /* XXX counter */
 3821                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
 3822         } else {
 3823                 dst->allocations = src->sadb_lifetime_allocations;
 3824                 dst->bytes = src->sadb_lifetime_bytes;
 3825                 dst->addtime = src->sadb_lifetime_addtime;
 3826                 dst->usetime = src->sadb_lifetime_usetime;
 3827         }
 3828         return dst;
 3829 }
 3830 
 3831 /* compare my own address
 3832  * OUT: 1: true, i.e. my address.
 3833  *      0: false
 3834  */
 3835 int
 3836 key_ismyaddr(struct sockaddr *sa)
 3837 {
 3838 
 3839         IPSEC_ASSERT(sa != NULL, ("null sockaddr"));
 3840         switch (sa->sa_family) {
 3841 #ifdef INET
 3842         case AF_INET:
 3843                 return (in_localip(satosin(sa)->sin_addr));
 3844 #endif
 3845 #ifdef INET6
 3846         case AF_INET6:
 3847                 return key_ismyaddr6((struct sockaddr_in6 *)sa);
 3848 #endif
 3849         }
 3850 
 3851         return 0;
 3852 }
 3853 
 3854 #ifdef INET6
 3855 /*
 3856  * compare my own address for IPv6.
 3857  * 1: ours
 3858  * 0: other
 3859  * NOTE: derived ip6_input() in KAME. This is necessary to modify more.
 3860  */
 3861 #include <netinet6/in6_var.h>
 3862 
 3863 static int
 3864 key_ismyaddr6(struct sockaddr_in6 *sin6)
 3865 {
 3866         struct in6_ifaddr *ia;
 3867 #if 0
 3868         struct in6_multi *in6m;
 3869 #endif
 3870 
 3871         IN6_IFADDR_RLOCK();
 3872         TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
 3873                 if (key_sockaddrcmp((struct sockaddr *)&sin6,
 3874                     (struct sockaddr *)&ia->ia_addr, 0) == 0) {
 3875                         IN6_IFADDR_RUNLOCK();
 3876                         return 1;
 3877                 }
 3878 
 3879 #if 0
 3880                 /*
 3881                  * XXX Multicast
 3882                  * XXX why do we care about multlicast here while we don't care
 3883                  * about IPv4 multicast??
 3884                  * XXX scope
 3885                  */
 3886                 in6m = NULL;
 3887                 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m);
 3888                 if (in6m) {
 3889                         IN6_IFADDR_RUNLOCK();
 3890                         return 1;
 3891                 }
 3892 #endif
 3893         }
 3894         IN6_IFADDR_RUNLOCK();
 3895 
 3896         /* loopback, just for safety */
 3897         if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
 3898                 return 1;
 3899 
 3900         return 0;
 3901 }
 3902 #endif /*INET6*/
 3903 
 3904 /*
 3905  * compare two secasindex structure.
 3906  * flag can specify to compare 2 saidxes.
 3907  * compare two secasindex structure without both mode and reqid.
 3908  * don't compare port.
 3909  * IN:  
 3910  *      saidx0: source, it can be in SAD.
 3911  *      saidx1: object.
 3912  * OUT: 
 3913  *      1 : equal
 3914  *      0 : not equal
 3915  */
 3916 static int
 3917 key_cmpsaidx(const struct secasindex *saidx0, const struct secasindex *saidx1,
 3918     int flag)
 3919 {
 3920         int chkport = 0;
 3921 
 3922         /* sanity */
 3923         if (saidx0 == NULL && saidx1 == NULL)
 3924                 return 1;
 3925 
 3926         if (saidx0 == NULL || saidx1 == NULL)
 3927                 return 0;
 3928 
 3929         if (saidx0->proto != saidx1->proto)
 3930                 return 0;
 3931 
 3932         if (flag == CMP_EXACTLY) {
 3933                 if (saidx0->mode != saidx1->mode)
 3934                         return 0;
 3935                 if (saidx0->reqid != saidx1->reqid)
 3936                         return 0;
 3937                 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 ||
 3938                     bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0)
 3939                         return 0;
 3940         } else {
 3941 
 3942                 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */
 3943                 if (flag == CMP_MODE_REQID
 3944                   ||flag == CMP_REQID) {
 3945                         /*
 3946                          * If reqid of SPD is non-zero, unique SA is required.
 3947                          * The result must be of same reqid in this case.
 3948                          */
 3949                         if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid)
 3950                                 return 0;
 3951                 }
 3952 
 3953                 if (flag == CMP_MODE_REQID) {
 3954                         if (saidx0->mode != IPSEC_MODE_ANY
 3955                          && saidx0->mode != saidx1->mode)
 3956                                 return 0;
 3957                 }
 3958 
 3959 #ifdef IPSEC_NAT_T
 3960                 /*
 3961                  * If NAT-T is enabled, check ports for tunnel mode.
 3962                  * Do not check ports if they are set to zero in the SPD.
 3963                  * Also do not do it for native transport mode, as there
 3964                  * is no port information available in the SP.
 3965                  */
 3966                 if ((saidx1->mode == IPSEC_MODE_TUNNEL ||
 3967                      (saidx1->mode == IPSEC_MODE_TRANSPORT &&
 3968                       saidx1->proto == IPPROTO_ESP)) &&
 3969                     saidx1->src.sa.sa_family == AF_INET &&
 3970                     saidx1->dst.sa.sa_family == AF_INET &&
 3971                     ((const struct sockaddr_in *)(&saidx1->src))->sin_port &&
 3972                     ((const struct sockaddr_in *)(&saidx1->dst))->sin_port)
 3973                         chkport = 1;
 3974 #endif /* IPSEC_NAT_T */
 3975 
 3976                 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, chkport) != 0) {
 3977                         return 0;
 3978                 }
 3979                 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, chkport) != 0) {
 3980                         return 0;
 3981                 }
 3982         }
 3983 
 3984         return 1;
 3985 }
 3986 
 3987 /*
 3988  * compare two secindex structure exactly.
 3989  * IN:
 3990  *      spidx0: source, it is often in SPD.
 3991  *      spidx1: object, it is often from PFKEY message.
 3992  * OUT:
 3993  *      1 : equal
 3994  *      0 : not equal
 3995  */
 3996 static int
 3997 key_cmpspidx_exactly(struct secpolicyindex *spidx0,
 3998     struct secpolicyindex *spidx1)
 3999 {
 4000         /* sanity */
 4001         if (spidx0 == NULL && spidx1 == NULL)
 4002                 return 1;
 4003 
 4004         if (spidx0 == NULL || spidx1 == NULL)
 4005                 return 0;
 4006 
 4007         if (spidx0->prefs != spidx1->prefs
 4008          || spidx0->prefd != spidx1->prefd
 4009          || spidx0->ul_proto != spidx1->ul_proto)
 4010                 return 0;
 4011 
 4012         return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 &&
 4013                key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0;
 4014 }
 4015 
 4016 /*
 4017  * compare two secindex structure with mask.
 4018  * IN:
 4019  *      spidx0: source, it is often in SPD.
 4020  *      spidx1: object, it is often from IP header.
 4021  * OUT:
 4022  *      1 : equal
 4023  *      0 : not equal
 4024  */
 4025 static int
 4026 key_cmpspidx_withmask(struct secpolicyindex *spidx0,
 4027     struct secpolicyindex *spidx1)
 4028 {
 4029         /* sanity */
 4030         if (spidx0 == NULL && spidx1 == NULL)
 4031                 return 1;
 4032 
 4033         if (spidx0 == NULL || spidx1 == NULL)
 4034                 return 0;
 4035 
 4036         if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family ||
 4037             spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family ||
 4038             spidx0->src.sa.sa_len != spidx1->src.sa.sa_len ||
 4039             spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len)
 4040                 return 0;
 4041 
 4042         /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */
 4043         if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY
 4044          && spidx0->ul_proto != spidx1->ul_proto)
 4045                 return 0;
 4046 
 4047         switch (spidx0->src.sa.sa_family) {
 4048         case AF_INET:
 4049                 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY
 4050                  && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port)
 4051                         return 0;
 4052                 if (!key_bbcmp(&spidx0->src.sin.sin_addr,
 4053                     &spidx1->src.sin.sin_addr, spidx0->prefs))
 4054                         return 0;
 4055                 break;
 4056         case AF_INET6:
 4057                 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY
 4058                  && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port)
 4059                         return 0;
 4060                 /*
 4061                  * scope_id check. if sin6_scope_id is 0, we regard it
 4062                  * as a wildcard scope, which matches any scope zone ID. 
 4063                  */
 4064                 if (spidx0->src.sin6.sin6_scope_id &&
 4065                     spidx1->src.sin6.sin6_scope_id &&
 4066                     spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id)
 4067                         return 0;
 4068                 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr,
 4069                     &spidx1->src.sin6.sin6_addr, spidx0->prefs))
 4070                         return 0;
 4071                 break;
 4072         default:
 4073                 /* XXX */
 4074                 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0)
 4075                         return 0;
 4076                 break;
 4077         }
 4078 
 4079         switch (spidx0->dst.sa.sa_family) {
 4080         case AF_INET:
 4081                 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY
 4082                  && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port)
 4083                         return 0;
 4084                 if (!key_bbcmp(&spidx0->dst.sin.sin_addr,
 4085                     &spidx1->dst.sin.sin_addr, spidx0->prefd))
 4086                         return 0;
 4087                 break;
 4088         case AF_INET6:
 4089                 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY
 4090                  && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port)
 4091                         return 0;
 4092                 /*
 4093                  * scope_id check. if sin6_scope_id is 0, we regard it
 4094                  * as a wildcard scope, which matches any scope zone ID. 
 4095                  */
 4096                 if (spidx0->dst.sin6.sin6_scope_id &&
 4097                     spidx1->dst.sin6.sin6_scope_id &&
 4098                     spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id)
 4099                         return 0;
 4100                 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr,
 4101                     &spidx1->dst.sin6.sin6_addr, spidx0->prefd))
 4102                         return 0;
 4103                 break;
 4104         default:
 4105                 /* XXX */
 4106                 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0)
 4107                         return 0;
 4108                 break;
 4109         }
 4110 
 4111         /* XXX Do we check other field ?  e.g. flowinfo */
 4112 
 4113         return 1;
 4114 }
 4115 
 4116 /* returns 0 on match */
 4117 static int
 4118 key_sockaddrcmp(const struct sockaddr *sa1, const struct sockaddr *sa2,
 4119     int port)
 4120 {
 4121 #ifdef satosin
 4122 #undef satosin
 4123 #endif
 4124 #define satosin(s) ((const struct sockaddr_in *)s)
 4125 #ifdef satosin6
 4126 #undef satosin6
 4127 #endif
 4128 #define satosin6(s) ((const struct sockaddr_in6 *)s)
 4129         if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len)
 4130                 return 1;
 4131 
 4132         switch (sa1->sa_family) {
 4133         case AF_INET:
 4134                 if (sa1->sa_len != sizeof(struct sockaddr_in))
 4135                         return 1;
 4136                 if (satosin(sa1)->sin_addr.s_addr !=
 4137                     satosin(sa2)->sin_addr.s_addr) {
 4138                         return 1;
 4139                 }
 4140                 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port)
 4141                         return 1;
 4142                 break;
 4143         case AF_INET6:
 4144                 if (sa1->sa_len != sizeof(struct sockaddr_in6))
 4145                         return 1;       /*EINVAL*/
 4146                 if (satosin6(sa1)->sin6_scope_id !=
 4147                     satosin6(sa2)->sin6_scope_id) {
 4148                         return 1;
 4149                 }
 4150                 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr,
 4151                     &satosin6(sa2)->sin6_addr)) {
 4152                         return 1;
 4153                 }
 4154                 if (port &&
 4155                     satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) {
 4156                         return 1;
 4157                 }
 4158                 break;
 4159         default:
 4160                 if (bcmp(sa1, sa2, sa1->sa_len) != 0)
 4161                         return 1;
 4162                 break;
 4163         }
 4164 
 4165         return 0;
 4166 #undef satosin
 4167 #undef satosin6
 4168 }
 4169 
 4170 /*
 4171  * compare two buffers with mask.
 4172  * IN:
 4173  *      addr1: source
 4174  *      addr2: object
 4175  *      bits:  Number of bits to compare
 4176  * OUT:
 4177  *      1 : equal
 4178  *      0 : not equal
 4179  */
 4180 static int
 4181 key_bbcmp(const void *a1, const void *a2, u_int bits)
 4182 {
 4183         const unsigned char *p1 = a1;
 4184         const unsigned char *p2 = a2;
 4185 
 4186         /* XXX: This could be considerably faster if we compare a word
 4187          * at a time, but it is complicated on LSB Endian machines */
 4188 
 4189         /* Handle null pointers */
 4190         if (p1 == NULL || p2 == NULL)
 4191                 return (p1 == p2);
 4192 
 4193         while (bits >= 8) {
 4194                 if (*p1++ != *p2++)
 4195                         return 0;
 4196                 bits -= 8;
 4197         }
 4198 
 4199         if (bits > 0) {
 4200                 u_int8_t mask = ~((1<<(8-bits))-1);
 4201                 if ((*p1 & mask) != (*p2 & mask))
 4202                         return 0;
 4203         }
 4204         return 1;       /* Match! */
 4205 }
 4206 
 4207 static void
 4208 key_flush_spd(time_t now)
 4209 {
 4210         SPTREE_RLOCK_TRACKER;
 4211         struct secpolicy *sp;
 4212         u_int dir;
 4213 
 4214         /* SPD */
 4215         for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
 4216 restart:
 4217                 SPTREE_RLOCK();
 4218                 TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
 4219                         if (sp->lifetime == 0 && sp->validtime == 0)
 4220                                 continue;
 4221                         if ((sp->lifetime &&
 4222                             now - sp->created > sp->lifetime) ||
 4223                             (sp->validtime &&
 4224                             now - sp->lastused > sp->validtime)) {
 4225                                 SP_ADDREF(sp);
 4226                                 SPTREE_RUNLOCK();
 4227                                 key_spdexpire(sp);
 4228                                 key_unlink(sp);
 4229                                 KEY_FREESP(&sp);
 4230                                 goto restart;
 4231                         }
 4232                 }
 4233                 SPTREE_RUNLOCK();
 4234         }
 4235 }
 4236 
 4237 static void
 4238 key_flush_sad(time_t now)
 4239 {
 4240         struct secashead *sah, *nextsah;
 4241         struct secasvar *sav, *nextsav;
 4242 
 4243         /* SAD */
 4244         SAHTREE_LOCK();
 4245         LIST_FOREACH_SAFE(sah, &V_sahtree, chain, nextsah) {
 4246                 /* if sah has been dead, then delete it and process next sah. */
 4247                 if (sah->state == SADB_SASTATE_DEAD) {
 4248                         key_delsah(sah);
 4249                         continue;
 4250                 }
 4251 
 4252                 /* if LARVAL entry doesn't become MATURE, delete it. */
 4253                 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) {
 4254                         /* Need to also check refcnt for a larval SA ??? */
 4255                         if (now - sav->created > V_key_larval_lifetime)
 4256                                 KEY_FREESAV(&sav);
 4257                 }
 4258 
 4259                 /*
 4260                  * check MATURE entry to start to send expire message
 4261                  * whether or not.
 4262                  */
 4263                 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) {
 4264                         /* we don't need to check. */
 4265                         if (sav->lft_s == NULL)
 4266                                 continue;
 4267 
 4268                         /* sanity check */
 4269                         if (sav->lft_c == NULL) {
 4270                                 ipseclog((LOG_DEBUG,"%s: there is no CURRENT "
 4271                                         "time, why?\n", __func__));
 4272                                 continue;
 4273                         }
 4274 
 4275                         /* check SOFT lifetime */
 4276                         if (sav->lft_s->addtime != 0 &&
 4277                             now - sav->created > sav->lft_s->addtime) {
 4278                                 key_sa_chgstate(sav, SADB_SASTATE_DYING);
 4279                                 /* 
 4280                                  * Actually, only send expire message if
 4281                                  * SA has been used, as it was done before,
 4282                                  * but should we always send such message,
 4283                                  * and let IKE daemon decide if it should be
 4284                                  * renegotiated or not ?
 4285                                  * XXX expire message will actually NOT be
 4286                                  * sent if SA is only used after soft
 4287                                  * lifetime has been reached, see below
 4288                                  * (DYING state)
 4289                                  */
 4290                                 if (sav->lft_c->usetime != 0)
 4291                                         key_expire(sav);
 4292                         }
 4293                         /* check SOFT lifetime by bytes */
 4294                         /*
 4295                          * XXX I don't know the way to delete this SA
 4296                          * when new SA is installed.  Caution when it's
 4297                          * installed too big lifetime by time.
 4298                          */
 4299                         else if (sav->lft_s->bytes != 0 &&
 4300                             sav->lft_s->bytes < sav->lft_c->bytes) {
 4301 
 4302                                 key_sa_chgstate(sav, SADB_SASTATE_DYING);
 4303                                 /*
 4304                                  * XXX If we keep to send expire
 4305                                  * message in the status of
 4306                                  * DYING. Do remove below code.
 4307                                  */
 4308                                 key_expire(sav);
 4309                         }
 4310                 }
 4311 
 4312                 /* check DYING entry to change status to DEAD. */
 4313                 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) {
 4314                         /* we don't need to check. */
 4315                         if (sav->lft_h == NULL)
 4316                                 continue;
 4317 
 4318                         /* sanity check */
 4319                         if (sav->lft_c == NULL) {
 4320                                 ipseclog((LOG_DEBUG, "%s: there is no CURRENT "
 4321                                         "time, why?\n", __func__));
 4322                                 continue;
 4323                         }
 4324 
 4325                         if (sav->lft_h->addtime != 0 &&
 4326                             now - sav->created > sav->lft_h->addtime) {
 4327                                 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
 4328                                 KEY_FREESAV(&sav);
 4329                         }
 4330 #if 0   /* XXX Should we keep to send expire message until HARD lifetime ? */
 4331                         else if (sav->lft_s != NULL
 4332                               && sav->lft_s->addtime != 0
 4333                               && now - sav->created > sav->lft_s->addtime) {
 4334                                 /*
 4335                                  * XXX: should be checked to be
 4336                                  * installed the valid SA.
 4337                                  */
 4338 
 4339                                 /*
 4340                                  * If there is no SA then sending
 4341                                  * expire message.
 4342                                  */
 4343                                 key_expire(sav);
 4344                         }
 4345 #endif
 4346                         /* check HARD lifetime by bytes */
 4347                         else if (sav->lft_h->bytes != 0 &&
 4348                             sav->lft_h->bytes < sav->lft_c->bytes) {
 4349                                 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
 4350                                 KEY_FREESAV(&sav);
 4351                         }
 4352                 }
 4353 
 4354                 /* delete entry in DEAD */
 4355                 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) {
 4356                         /* sanity check */
 4357                         if (sav->state != SADB_SASTATE_DEAD) {
 4358                                 ipseclog((LOG_DEBUG, "%s: invalid sav->state "
 4359                                         "(queue: %d SA: %d): kill it anyway\n",
 4360                                         __func__,
 4361                                         SADB_SASTATE_DEAD, sav->state));
 4362                         }
 4363                         /*
 4364                          * do not call key_freesav() here.
 4365                          * sav should already be freed, and sav->refcnt
 4366                          * shows other references to sav
 4367                          * (such as from SPD).
 4368                          */
 4369                 }
 4370         }
 4371         SAHTREE_UNLOCK();
 4372 }
 4373 
 4374 static void
 4375 key_flush_acq(time_t now)
 4376 {
 4377         struct secacq *acq, *nextacq;
 4378 
 4379         /* ACQ tree */
 4380         ACQ_LOCK();
 4381         for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) {
 4382                 nextacq = LIST_NEXT(acq, chain);
 4383                 if (now - acq->created > V_key_blockacq_lifetime
 4384                  && __LIST_CHAINED(acq)) {
 4385                         LIST_REMOVE(acq, chain);
 4386                         free(acq, M_IPSEC_SAQ);
 4387                 }
 4388         }
 4389         ACQ_UNLOCK();
 4390 }
 4391 
 4392 static void
 4393 key_flush_spacq(time_t now)
 4394 {
 4395         struct secspacq *acq, *nextacq;
 4396 
 4397         /* SP ACQ tree */
 4398         SPACQ_LOCK();
 4399         for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) {
 4400                 nextacq = LIST_NEXT(acq, chain);
 4401                 if (now - acq->created > V_key_blockacq_lifetime
 4402                  && __LIST_CHAINED(acq)) {
 4403                         LIST_REMOVE(acq, chain);
 4404                         free(acq, M_IPSEC_SAQ);
 4405                 }
 4406         }
 4407         SPACQ_UNLOCK();
 4408 }
 4409 
 4410 /*
 4411  * time handler.
 4412  * scanning SPD and SAD to check status for each entries,
 4413  * and do to remove or to expire.
 4414  * XXX: year 2038 problem may remain.
 4415  */
 4416 static void
 4417 key_timehandler(void *arg)
 4418 {
 4419         VNET_ITERATOR_DECL(vnet_iter);
 4420         time_t now = time_second;
 4421 
 4422         VNET_LIST_RLOCK_NOSLEEP();
 4423         VNET_FOREACH(vnet_iter) {
 4424                 CURVNET_SET(vnet_iter);
 4425                 key_flush_spd(now);
 4426                 key_flush_sad(now);
 4427                 key_flush_acq(now);
 4428                 key_flush_spacq(now);
 4429                 CURVNET_RESTORE();
 4430         }
 4431         VNET_LIST_RUNLOCK_NOSLEEP();
 4432 
 4433 #ifndef IPSEC_DEBUG2
 4434         /* do exchange to tick time !! */
 4435         callout_schedule(&key_timer, hz);
 4436 #endif /* IPSEC_DEBUG2 */
 4437 }
 4438 
 4439 u_long
 4440 key_random()
 4441 {
 4442         u_long value;
 4443 
 4444         key_randomfill(&value, sizeof(value));
 4445         return value;
 4446 }
 4447 
 4448 void
 4449 key_randomfill(void *p, size_t l)
 4450 {
 4451         size_t n;
 4452         u_long v;
 4453         static int warn = 1;
 4454 
 4455         n = 0;
 4456         n = (size_t)read_random(p, (u_int)l);
 4457         /* last resort */
 4458         while (n < l) {
 4459                 v = random();
 4460                 bcopy(&v, (u_int8_t *)p + n,
 4461                     l - n < sizeof(v) ? l - n : sizeof(v));
 4462                 n += sizeof(v);
 4463 
 4464                 if (warn) {
 4465                         printf("WARNING: pseudo-random number generator "
 4466                             "used for IPsec processing\n");
 4467                         warn = 0;
 4468                 }
 4469         }
 4470 }
 4471 
 4472 /*
 4473  * map SADB_SATYPE_* to IPPROTO_*.
 4474  * if satype == SADB_SATYPE then satype is mapped to ~0.
 4475  * OUT:
 4476  *      0: invalid satype.
 4477  */
 4478 static u_int16_t
 4479 key_satype2proto(u_int8_t satype)
 4480 {
 4481         switch (satype) {
 4482         case SADB_SATYPE_UNSPEC:
 4483                 return IPSEC_PROTO_ANY;
 4484         case SADB_SATYPE_AH:
 4485                 return IPPROTO_AH;
 4486         case SADB_SATYPE_ESP:
 4487                 return IPPROTO_ESP;
 4488         case SADB_X_SATYPE_IPCOMP:
 4489                 return IPPROTO_IPCOMP;
 4490         case SADB_X_SATYPE_TCPSIGNATURE:
 4491                 return IPPROTO_TCP;
 4492         default:
 4493                 return 0;
 4494         }
 4495         /* NOTREACHED */
 4496 }
 4497 
 4498 /*
 4499  * map IPPROTO_* to SADB_SATYPE_*
 4500  * OUT:
 4501  *      0: invalid protocol type.
 4502  */
 4503 static u_int8_t
 4504 key_proto2satype(u_int16_t proto)
 4505 {
 4506         switch (proto) {
 4507         case IPPROTO_AH:
 4508                 return SADB_SATYPE_AH;
 4509         case IPPROTO_ESP:
 4510                 return SADB_SATYPE_ESP;
 4511         case IPPROTO_IPCOMP:
 4512                 return SADB_X_SATYPE_IPCOMP;
 4513         case IPPROTO_TCP:
 4514                 return SADB_X_SATYPE_TCPSIGNATURE;
 4515         default:
 4516                 return 0;
 4517         }
 4518         /* NOTREACHED */
 4519 }
 4520 
 4521 /* %%% PF_KEY */
 4522 /*
 4523  * SADB_GETSPI processing is to receive
 4524  *      <base, (SA2), src address, dst address, (SPI range)>
 4525  * from the IKMPd, to assign a unique spi value, to hang on the INBOUND
 4526  * tree with the status of LARVAL, and send
 4527  *      <base, SA(*), address(SD)>
 4528  * to the IKMPd.
 4529  *
 4530  * IN:  mhp: pointer to the pointer to each header.
 4531  * OUT: NULL if fail.
 4532  *      other if success, return pointer to the message to send.
 4533  */
 4534 static int
 4535 key_getspi(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
 4536 {
 4537         struct sadb_address *src0, *dst0;
 4538         struct secasindex saidx;
 4539         struct secashead *newsah;
 4540         struct secasvar *newsav;
 4541         u_int8_t proto;
 4542         u_int32_t spi;
 4543         u_int8_t mode;
 4544         u_int32_t reqid;
 4545         int error;
 4546 
 4547         IPSEC_ASSERT(so != NULL, ("null socket"));
 4548         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 4549         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 4550         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 4551 
 4552         if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
 4553             mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
 4554                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 4555                         __func__));
 4556                 return key_senderror(so, m, EINVAL);
 4557         }
 4558         if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
 4559             mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
 4560                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 4561                         __func__));
 4562                 return key_senderror(so, m, EINVAL);
 4563         }
 4564         if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
 4565                 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
 4566                 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
 4567         } else {
 4568                 mode = IPSEC_MODE_ANY;
 4569                 reqid = 0;
 4570         }
 4571 
 4572         src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
 4573         dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
 4574 
 4575         /* map satype to proto */
 4576         if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
 4577                 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
 4578                         __func__));
 4579                 return key_senderror(so, m, EINVAL);
 4580         }
 4581 
 4582         /*
 4583          * Make sure the port numbers are zero.
 4584          * In case of NAT-T we will update them later if needed.
 4585          */
 4586         switch (((struct sockaddr *)(src0 + 1))->sa_family) {
 4587         case AF_INET:
 4588                 if (((struct sockaddr *)(src0 + 1))->sa_len !=
 4589                     sizeof(struct sockaddr_in))
 4590                         return key_senderror(so, m, EINVAL);
 4591                 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0;
 4592                 break;
 4593         case AF_INET6:
 4594                 if (((struct sockaddr *)(src0 + 1))->sa_len !=
 4595                     sizeof(struct sockaddr_in6))
 4596                         return key_senderror(so, m, EINVAL);
 4597                 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0;
 4598                 break;
 4599         default:
 4600                 ; /*???*/
 4601         }
 4602         switch (((struct sockaddr *)(dst0 + 1))->sa_family) {
 4603         case AF_INET:
 4604                 if (((struct sockaddr *)(dst0 + 1))->sa_len !=
 4605                     sizeof(struct sockaddr_in))
 4606                         return key_senderror(so, m, EINVAL);
 4607                 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0;
 4608                 break;
 4609         case AF_INET6:
 4610                 if (((struct sockaddr *)(dst0 + 1))->sa_len !=
 4611                     sizeof(struct sockaddr_in6))
 4612                         return key_senderror(so, m, EINVAL);
 4613                 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0;
 4614                 break;
 4615         default:
 4616                 ; /*???*/
 4617         }
 4618 
 4619         /* XXX boundary check against sa_len */
 4620         KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
 4621 
 4622 #ifdef IPSEC_NAT_T
 4623         /*
 4624          * Handle NAT-T info if present.
 4625          * We made sure the port numbers are zero above, so we do
 4626          * not have to worry in case we do not update them.
 4627          */
 4628         if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL)
 4629                 ipseclog((LOG_DEBUG, "%s: NAT-T OAi present\n", __func__));
 4630         if (mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL)
 4631                 ipseclog((LOG_DEBUG, "%s: NAT-T OAr present\n", __func__));
 4632 
 4633         if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL &&
 4634             mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL &&
 4635             mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) {
 4636                 struct sadb_x_nat_t_type *type;
 4637                 struct sadb_x_nat_t_port *sport, *dport;
 4638 
 4639                 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) ||
 4640                     mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) ||
 4641                     mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) {
 4642                         ipseclog((LOG_DEBUG, "%s: invalid nat-t message "
 4643                             "passed.\n", __func__));
 4644                         return key_senderror(so, m, EINVAL);
 4645                 }
 4646 
 4647                 sport = (struct sadb_x_nat_t_port *)
 4648                     mhp->ext[SADB_X_EXT_NAT_T_SPORT];
 4649                 dport = (struct sadb_x_nat_t_port *)
 4650                     mhp->ext[SADB_X_EXT_NAT_T_DPORT];
 4651 
 4652                 if (sport)
 4653                         KEY_PORTTOSADDR(&saidx.src, sport->sadb_x_nat_t_port_port);
 4654                 if (dport)
 4655                         KEY_PORTTOSADDR(&saidx.dst, dport->sadb_x_nat_t_port_port);
 4656         }
 4657 #endif
 4658 
 4659         /* SPI allocation */
 4660         spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE],
 4661                                &saidx);
 4662         if (spi == 0)
 4663                 return key_senderror(so, m, EINVAL);
 4664 
 4665         /* get a SA index */
 4666         if ((newsah = key_getsah(&saidx)) == NULL) {
 4667                 /* create a new SA index */
 4668                 if ((newsah = key_newsah(&saidx)) == NULL) {
 4669                         ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__));
 4670                         return key_senderror(so, m, ENOBUFS);
 4671                 }
 4672         }
 4673 
 4674         /* get a new SA */
 4675         /* XXX rewrite */
 4676         newsav = KEY_NEWSAV(m, mhp, newsah, &error);
 4677         if (newsav == NULL) {
 4678                 /* XXX don't free new SA index allocated in above. */
 4679                 return key_senderror(so, m, error);
 4680         }
 4681 
 4682         /* set spi */
 4683         newsav->spi = htonl(spi);
 4684 
 4685         /* delete the entry in acqtree */
 4686         if (mhp->msg->sadb_msg_seq != 0) {
 4687                 struct secacq *acq;
 4688                 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) {
 4689                         /* reset counter in order to deletion by timehandler. */
 4690                         acq->created = time_second;
 4691                         acq->count = 0;
 4692                 }
 4693         }
 4694 
 4695     {
 4696         struct mbuf *n, *nn;
 4697         struct sadb_sa *m_sa;
 4698         struct sadb_msg *newmsg;
 4699         int off, len;
 4700 
 4701         /* create new sadb_msg to reply. */
 4702         len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) +
 4703             PFKEY_ALIGN8(sizeof(struct sadb_sa));
 4704 
 4705         MGETHDR(n, M_NOWAIT, MT_DATA);
 4706         if (len > MHLEN) {
 4707                 if (!(MCLGET(n, M_NOWAIT))) {
 4708                         m_freem(n);
 4709                         n = NULL;
 4710                 }
 4711         }
 4712         if (!n)
 4713                 return key_senderror(so, m, ENOBUFS);
 4714 
 4715         n->m_len = len;
 4716         n->m_next = NULL;
 4717         off = 0;
 4718 
 4719         m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
 4720         off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
 4721 
 4722         m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off);
 4723         m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa));
 4724         m_sa->sadb_sa_exttype = SADB_EXT_SA;
 4725         m_sa->sadb_sa_spi = htonl(spi);
 4726         off += PFKEY_ALIGN8(sizeof(struct sadb_sa));
 4727 
 4728         IPSEC_ASSERT(off == len,
 4729                 ("length inconsistency (off %u len %u)", off, len));
 4730 
 4731         n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC,
 4732             SADB_EXT_ADDRESS_DST);
 4733         if (!n->m_next) {
 4734                 m_freem(n);
 4735                 return key_senderror(so, m, ENOBUFS);
 4736         }
 4737 
 4738         if (n->m_len < sizeof(struct sadb_msg)) {
 4739                 n = m_pullup(n, sizeof(struct sadb_msg));
 4740                 if (n == NULL)
 4741                         return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
 4742         }
 4743 
 4744         n->m_pkthdr.len = 0;
 4745         for (nn = n; nn; nn = nn->m_next)
 4746                 n->m_pkthdr.len += nn->m_len;
 4747 
 4748         newmsg = mtod(n, struct sadb_msg *);
 4749         newmsg->sadb_msg_seq = newsav->seq;
 4750         newmsg->sadb_msg_errno = 0;
 4751         newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
 4752 
 4753         m_freem(m);
 4754         return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
 4755     }
 4756 }
 4757 
 4758 /*
 4759  * allocating new SPI
 4760  * called by key_getspi().
 4761  * OUT:
 4762  *      0:      failure.
 4763  *      others: success.
 4764  */
 4765 static u_int32_t
 4766 key_do_getnewspi(struct sadb_spirange *spirange, struct secasindex *saidx)
 4767 {
 4768         u_int32_t newspi;
 4769         u_int32_t min, max;
 4770         int count = V_key_spi_trycnt;
 4771 
 4772         /* set spi range to allocate */
 4773         if (spirange != NULL) {
 4774                 min = spirange->sadb_spirange_min;
 4775                 max = spirange->sadb_spirange_max;
 4776         } else {
 4777                 min = V_key_spi_minval;
 4778                 max = V_key_spi_maxval;
 4779         }
 4780         /* IPCOMP needs 2-byte SPI */
 4781         if (saidx->proto == IPPROTO_IPCOMP) {
 4782                 u_int32_t t;
 4783                 if (min >= 0x10000)
 4784                         min = 0xffff;
 4785                 if (max >= 0x10000)
 4786                         max = 0xffff;
 4787                 if (min > max) {
 4788                         t = min; min = max; max = t;
 4789                 }
 4790         }
 4791 
 4792         if (min == max) {
 4793                 if (key_checkspidup(saidx, min) != NULL) {
 4794                         ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n",
 4795                                 __func__, min));
 4796                         return 0;
 4797                 }
 4798 
 4799                 count--; /* taking one cost. */
 4800                 newspi = min;
 4801 
 4802         } else {
 4803 
 4804                 /* init SPI */
 4805                 newspi = 0;
 4806 
 4807                 /* when requesting to allocate spi ranged */
 4808                 while (count--) {
 4809                         /* generate pseudo-random SPI value ranged. */
 4810                         newspi = min + (key_random() % (max - min + 1));
 4811 
 4812                         if (key_checkspidup(saidx, newspi) == NULL)
 4813                                 break;
 4814                 }
 4815 
 4816                 if (count == 0 || newspi == 0) {
 4817                         ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n",
 4818                                 __func__));
 4819                         return 0;
 4820                 }
 4821         }
 4822 
 4823         /* statistics */
 4824         keystat.getspi_count =
 4825                 (keystat.getspi_count + V_key_spi_trycnt - count) / 2;
 4826 
 4827         return newspi;
 4828 }
 4829 
 4830 /*
 4831  * SADB_UPDATE processing
 4832  * receive
 4833  *   <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
 4834  *       key(AE), (identity(SD),) (sensitivity)>
 4835  * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL.
 4836  * and send
 4837  *   <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
 4838  *       (identity(SD),) (sensitivity)>
 4839  * to the ikmpd.
 4840  *
 4841  * m will always be freed.
 4842  */
 4843 static int
 4844 key_update(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
 4845 {
 4846         struct sadb_sa *sa0;
 4847         struct sadb_address *src0, *dst0;
 4848 #ifdef IPSEC_NAT_T
 4849         struct sadb_x_nat_t_type *type;
 4850         struct sadb_x_nat_t_port *sport, *dport;
 4851         struct sadb_address *iaddr, *raddr;
 4852         struct sadb_x_nat_t_frag *frag;
 4853 #endif
 4854         struct secasindex saidx;
 4855         struct secashead *sah;
 4856         struct secasvar *sav;
 4857         u_int16_t proto;
 4858         u_int8_t mode;
 4859         u_int32_t reqid;
 4860         int error;
 4861 
 4862         IPSEC_ASSERT(so != NULL, ("null socket"));
 4863         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 4864         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 4865         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 4866 
 4867         /* map satype to proto */
 4868         if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
 4869                 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
 4870                         __func__));
 4871                 return key_senderror(so, m, EINVAL);
 4872         }
 4873 
 4874         if (mhp->ext[SADB_EXT_SA] == NULL ||
 4875             mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
 4876             mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
 4877             (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP &&
 4878              mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) ||
 4879             (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH &&
 4880              mhp->ext[SADB_EXT_KEY_AUTH] == NULL) ||
 4881             (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL &&
 4882              mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) ||
 4883             (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL &&
 4884              mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) {
 4885                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 4886                         __func__));
 4887                 return key_senderror(so, m, EINVAL);
 4888         }
 4889         if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
 4890             mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
 4891             mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
 4892                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 4893                         __func__));
 4894                 return key_senderror(so, m, EINVAL);
 4895         }
 4896         if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
 4897                 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
 4898                 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
 4899         } else {
 4900                 mode = IPSEC_MODE_ANY;
 4901                 reqid = 0;
 4902         }
 4903         /* XXX boundary checking for other extensions */
 4904 
 4905         sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
 4906         src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
 4907         dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
 4908 
 4909         /* XXX boundary check against sa_len */
 4910         KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
 4911 
 4912         /*
 4913          * Make sure the port numbers are zero.
 4914          * In case of NAT-T we will update them later if needed.
 4915          */
 4916         KEY_PORTTOSADDR(&saidx.src, 0);
 4917         KEY_PORTTOSADDR(&saidx.dst, 0);
 4918 
 4919 #ifdef IPSEC_NAT_T
 4920         /*
 4921          * Handle NAT-T info if present.
 4922          */
 4923         if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL &&
 4924             mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL &&
 4925             mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) {
 4926 
 4927                 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) ||
 4928                     mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) ||
 4929                     mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) {
 4930                         ipseclog((LOG_DEBUG, "%s: invalid message.\n",
 4931                             __func__));
 4932                         return key_senderror(so, m, EINVAL);
 4933                 }
 4934 
 4935                 type = (struct sadb_x_nat_t_type *)
 4936                     mhp->ext[SADB_X_EXT_NAT_T_TYPE];
 4937                 sport = (struct sadb_x_nat_t_port *)
 4938                     mhp->ext[SADB_X_EXT_NAT_T_SPORT];
 4939                 dport = (struct sadb_x_nat_t_port *)
 4940                     mhp->ext[SADB_X_EXT_NAT_T_DPORT];
 4941         } else {
 4942                 type = 0;
 4943                 sport = dport = 0;
 4944         }
 4945         if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL &&
 4946             mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) {
 4947                 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) ||
 4948                     mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) {
 4949                         ipseclog((LOG_DEBUG, "%s: invalid message\n",
 4950                             __func__));
 4951                         return key_senderror(so, m, EINVAL);
 4952                 }
 4953                 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI];
 4954                 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR];
 4955                 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__));
 4956         } else {
 4957                 iaddr = raddr = NULL;
 4958         }
 4959         if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) {
 4960                 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) {
 4961                         ipseclog((LOG_DEBUG, "%s: invalid message\n",
 4962                             __func__));
 4963                         return key_senderror(so, m, EINVAL);
 4964                 }
 4965                 frag = (struct sadb_x_nat_t_frag *)
 4966                     mhp->ext[SADB_X_EXT_NAT_T_FRAG];
 4967         } else {
 4968                 frag = 0;
 4969         }
 4970 #endif
 4971 
 4972         /* get a SA header */
 4973         if ((sah = key_getsah(&saidx)) == NULL) {
 4974                 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__));
 4975                 return key_senderror(so, m, ENOENT);
 4976         }
 4977 
 4978         /* set spidx if there */
 4979         /* XXX rewrite */
 4980         error = key_setident(sah, m, mhp);
 4981         if (error)
 4982                 return key_senderror(so, m, error);
 4983 
 4984         /* find a SA with sequence number. */
 4985 #ifdef IPSEC_DOSEQCHECK
 4986         if (mhp->msg->sadb_msg_seq != 0
 4987          && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) {
 4988                 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u "
 4989                         "exists.\n", __func__, mhp->msg->sadb_msg_seq));
 4990                 return key_senderror(so, m, ENOENT);
 4991         }
 4992 #else
 4993         SAHTREE_LOCK();
 4994         sav = key_getsavbyspi(sah, sa0->sadb_sa_spi);
 4995         SAHTREE_UNLOCK();
 4996         if (sav == NULL) {
 4997                 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n",
 4998                         __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi)));
 4999                 return key_senderror(so, m, EINVAL);
 5000         }
 5001 #endif
 5002 
 5003         /* validity check */
 5004         if (sav->sah->saidx.proto != proto) {
 5005                 ipseclog((LOG_DEBUG, "%s: protocol mismatched "
 5006                         "(DB=%u param=%u)\n", __func__,
 5007                         sav->sah->saidx.proto, proto));
 5008                 return key_senderror(so, m, EINVAL);
 5009         }
 5010 #ifdef IPSEC_DOSEQCHECK
 5011         if (sav->spi != sa0->sadb_sa_spi) {
 5012                 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n",
 5013                     __func__,
 5014                     (u_int32_t)ntohl(sav->spi),
 5015                     (u_int32_t)ntohl(sa0->sadb_sa_spi)));
 5016                 return key_senderror(so, m, EINVAL);
 5017         }
 5018 #endif
 5019         if (sav->pid != mhp->msg->sadb_msg_pid) {
 5020                 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n",
 5021                     __func__, sav->pid, mhp->msg->sadb_msg_pid));
 5022                 return key_senderror(so, m, EINVAL);
 5023         }
 5024 
 5025         /* copy sav values */
 5026         error = key_setsaval(sav, m, mhp);
 5027         if (error) {
 5028                 KEY_FREESAV(&sav);
 5029                 return key_senderror(so, m, error);
 5030         }
 5031 
 5032 #ifdef IPSEC_NAT_T
 5033         /*
 5034          * Handle more NAT-T info if present,
 5035          * now that we have a sav to fill.
 5036          */
 5037         if (type)
 5038                 sav->natt_type = type->sadb_x_nat_t_type_type;
 5039 
 5040         if (sport)
 5041                 KEY_PORTTOSADDR(&sav->sah->saidx.src,
 5042                     sport->sadb_x_nat_t_port_port);
 5043         if (dport)
 5044                 KEY_PORTTOSADDR(&sav->sah->saidx.dst,
 5045                     dport->sadb_x_nat_t_port_port);
 5046 
 5047 #if 0
 5048         /*
 5049          * In case SADB_X_EXT_NAT_T_FRAG was not given, leave it at 0.
 5050          * We should actually check for a minimum MTU here, if we
 5051          * want to support it in ip_output.
 5052          */
 5053         if (frag)
 5054                 sav->natt_esp_frag_len = frag->sadb_x_nat_t_frag_fraglen;
 5055 #endif
 5056 #endif
 5057 
 5058         /* check SA values to be mature. */
 5059         if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) {
 5060                 KEY_FREESAV(&sav);
 5061                 return key_senderror(so, m, 0);
 5062         }
 5063 
 5064     {
 5065         struct mbuf *n;
 5066 
 5067         /* set msg buf from mhp */
 5068         n = key_getmsgbuf_x1(m, mhp);
 5069         if (n == NULL) {
 5070                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
 5071                 return key_senderror(so, m, ENOBUFS);
 5072         }
 5073 
 5074         m_freem(m);
 5075         return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
 5076     }
 5077 }
 5078 
 5079 /*
 5080  * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL.
 5081  * only called by key_update().
 5082  * OUT:
 5083  *      NULL    : not found
 5084  *      others  : found, pointer to a SA.
 5085  */
 5086 #ifdef IPSEC_DOSEQCHECK
 5087 static struct secasvar *
 5088 key_getsavbyseq(struct secashead *sah, u_int32_t seq)
 5089 {
 5090         struct secasvar *sav;
 5091         u_int state;
 5092 
 5093         state = SADB_SASTATE_LARVAL;
 5094 
 5095         /* search SAD with sequence number ? */
 5096         LIST_FOREACH(sav, &sah->savtree[state], chain) {
 5097 
 5098                 KEY_CHKSASTATE(state, sav->state, __func__);
 5099 
 5100                 if (sav->seq == seq) {
 5101                         sa_addref(sav);
 5102                         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 5103                                 printf("DP %s cause refcnt++:%d SA:%p\n",
 5104                                         __func__, sav->refcnt, sav));
 5105                         return sav;
 5106                 }
 5107         }
 5108 
 5109         return NULL;
 5110 }
 5111 #endif
 5112 
 5113 /*
 5114  * SADB_ADD processing
 5115  * add an entry to SA database, when received
 5116  *   <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
 5117  *       key(AE), (identity(SD),) (sensitivity)>
 5118  * from the ikmpd,
 5119  * and send
 5120  *   <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
 5121  *       (identity(SD),) (sensitivity)>
 5122  * to the ikmpd.
 5123  *
 5124  * IGNORE identity and sensitivity messages.
 5125  *
 5126  * m will always be freed.
 5127  */
 5128 static int
 5129 key_add(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
 5130 {
 5131         struct sadb_sa *sa0;
 5132         struct sadb_address *src0, *dst0;
 5133 #ifdef IPSEC_NAT_T
 5134         struct sadb_x_nat_t_type *type;
 5135         struct sadb_address *iaddr, *raddr;
 5136         struct sadb_x_nat_t_frag *frag;
 5137 #endif
 5138         struct secasindex saidx;
 5139         struct secashead *newsah;
 5140         struct secasvar *newsav;
 5141         u_int16_t proto;
 5142         u_int8_t mode;
 5143         u_int32_t reqid;
 5144         int error;
 5145 
 5146         IPSEC_ASSERT(so != NULL, ("null socket"));
 5147         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 5148         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 5149         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 5150 
 5151         /* map satype to proto */
 5152         if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
 5153                 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
 5154                         __func__));
 5155                 return key_senderror(so, m, EINVAL);
 5156         }
 5157 
 5158         if (mhp->ext[SADB_EXT_SA] == NULL ||
 5159             mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
 5160             mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
 5161             (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP &&
 5162              mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) ||
 5163             (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH &&
 5164              mhp->ext[SADB_EXT_KEY_AUTH] == NULL) ||
 5165             (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL &&
 5166              mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) ||
 5167             (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL &&
 5168              mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) {
 5169                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 5170                         __func__));
 5171                 return key_senderror(so, m, EINVAL);
 5172         }
 5173         if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
 5174             mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
 5175             mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
 5176                 /* XXX need more */
 5177                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 5178                         __func__));
 5179                 return key_senderror(so, m, EINVAL);
 5180         }
 5181         if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
 5182                 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
 5183                 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
 5184         } else {
 5185                 mode = IPSEC_MODE_ANY;
 5186                 reqid = 0;
 5187         }
 5188 
 5189         sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
 5190         src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
 5191         dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
 5192 
 5193         /* XXX boundary check against sa_len */
 5194         KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
 5195 
 5196         /*
 5197          * Make sure the port numbers are zero.
 5198          * In case of NAT-T we will update them later if needed.
 5199          */
 5200         KEY_PORTTOSADDR(&saidx.src, 0);
 5201         KEY_PORTTOSADDR(&saidx.dst, 0);
 5202 
 5203 #ifdef IPSEC_NAT_T
 5204         /*
 5205          * Handle NAT-T info if present.
 5206          */
 5207         if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL &&
 5208             mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL &&
 5209             mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) {
 5210                 struct sadb_x_nat_t_port *sport, *dport;
 5211 
 5212                 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) ||
 5213                     mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) ||
 5214                     mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) {
 5215                         ipseclog((LOG_DEBUG, "%s: invalid message.\n",
 5216                             __func__));
 5217                         return key_senderror(so, m, EINVAL);
 5218                 }
 5219 
 5220                 type = (struct sadb_x_nat_t_type *)
 5221                     mhp->ext[SADB_X_EXT_NAT_T_TYPE];
 5222                 sport = (struct sadb_x_nat_t_port *)
 5223                     mhp->ext[SADB_X_EXT_NAT_T_SPORT];
 5224                 dport = (struct sadb_x_nat_t_port *)
 5225                     mhp->ext[SADB_X_EXT_NAT_T_DPORT];
 5226 
 5227                 if (sport)
 5228                         KEY_PORTTOSADDR(&saidx.src,
 5229                             sport->sadb_x_nat_t_port_port);
 5230                 if (dport)
 5231                         KEY_PORTTOSADDR(&saidx.dst,
 5232                             dport->sadb_x_nat_t_port_port);
 5233         } else {
 5234                 type = 0;
 5235         }
 5236         if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL &&
 5237             mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) {
 5238                 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) ||
 5239                     mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) {
 5240                         ipseclog((LOG_DEBUG, "%s: invalid message\n",
 5241                             __func__));
 5242                         return key_senderror(so, m, EINVAL);
 5243                 }
 5244                 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI];
 5245                 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR];
 5246                 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__));
 5247         } else {
 5248                 iaddr = raddr = NULL;
 5249         }
 5250         if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) {
 5251                 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) {
 5252                         ipseclog((LOG_DEBUG, "%s: invalid message\n",
 5253                             __func__));
 5254                         return key_senderror(so, m, EINVAL);
 5255                 }
 5256                 frag = (struct sadb_x_nat_t_frag *)
 5257                     mhp->ext[SADB_X_EXT_NAT_T_FRAG];
 5258         } else {
 5259                 frag = 0;
 5260         }
 5261 #endif
 5262 
 5263         /* get a SA header */
 5264         if ((newsah = key_getsah(&saidx)) == NULL) {
 5265                 /* create a new SA header */
 5266                 if ((newsah = key_newsah(&saidx)) == NULL) {
 5267                         ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__));
 5268                         return key_senderror(so, m, ENOBUFS);
 5269                 }
 5270         }
 5271 
 5272         /* set spidx if there */
 5273         /* XXX rewrite */
 5274         error = key_setident(newsah, m, mhp);
 5275         if (error) {
 5276                 return key_senderror(so, m, error);
 5277         }
 5278 
 5279         /* create new SA entry. */
 5280         /* We can create new SA only if SPI is differenct. */
 5281         SAHTREE_LOCK();
 5282         newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi);
 5283         SAHTREE_UNLOCK();
 5284         if (newsav != NULL) {
 5285                 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__));
 5286                 return key_senderror(so, m, EEXIST);
 5287         }
 5288         newsav = KEY_NEWSAV(m, mhp, newsah, &error);
 5289         if (newsav == NULL) {
 5290                 return key_senderror(so, m, error);
 5291         }
 5292 
 5293 #ifdef IPSEC_NAT_T
 5294         /*
 5295          * Handle more NAT-T info if present,
 5296          * now that we have a sav to fill.
 5297          */
 5298         if (type)
 5299                 newsav->natt_type = type->sadb_x_nat_t_type_type;
 5300 
 5301 #if 0
 5302         /*
 5303          * In case SADB_X_EXT_NAT_T_FRAG was not given, leave it at 0.
 5304          * We should actually check for a minimum MTU here, if we
 5305          * want to support it in ip_output.
 5306          */
 5307         if (frag)
 5308                 newsav->natt_esp_frag_len = frag->sadb_x_nat_t_frag_fraglen;
 5309 #endif
 5310 #endif
 5311 
 5312         /* check SA values to be mature. */
 5313         if ((error = key_mature(newsav)) != 0) {
 5314                 KEY_FREESAV(&newsav);
 5315                 return key_senderror(so, m, error);
 5316         }
 5317 
 5318         /*
 5319          * don't call key_freesav() here, as we would like to keep the SA
 5320          * in the database on success.
 5321          */
 5322 
 5323     {
 5324         struct mbuf *n;
 5325 
 5326         /* set msg buf from mhp */
 5327         n = key_getmsgbuf_x1(m, mhp);
 5328         if (n == NULL) {
 5329                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
 5330                 return key_senderror(so, m, ENOBUFS);
 5331         }
 5332 
 5333         m_freem(m);
 5334         return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
 5335     }
 5336 }
 5337 
 5338 /* m is retained */
 5339 static int
 5340 key_setident(struct secashead *sah, struct mbuf *m,
 5341     const struct sadb_msghdr *mhp)
 5342 {
 5343         const struct sadb_ident *idsrc, *iddst;
 5344         int idsrclen, iddstlen;
 5345 
 5346         IPSEC_ASSERT(sah != NULL, ("null secashead"));
 5347         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 5348         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 5349         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 5350 
 5351         /* don't make buffer if not there */
 5352         if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL &&
 5353             mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) {
 5354                 sah->idents = NULL;
 5355                 sah->identd = NULL;
 5356                 return 0;
 5357         }
 5358         
 5359         if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL ||
 5360             mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) {
 5361                 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__));
 5362                 return EINVAL;
 5363         }
 5364 
 5365         idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC];
 5366         iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST];
 5367         idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC];
 5368         iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST];
 5369 
 5370         /* validity check */
 5371         if (idsrc->sadb_ident_type != iddst->sadb_ident_type) {
 5372                 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__));
 5373                 return EINVAL;
 5374         }
 5375 
 5376         switch (idsrc->sadb_ident_type) {
 5377         case SADB_IDENTTYPE_PREFIX:
 5378         case SADB_IDENTTYPE_FQDN:
 5379         case SADB_IDENTTYPE_USERFQDN:
 5380         default:
 5381                 /* XXX do nothing */
 5382                 sah->idents = NULL;
 5383                 sah->identd = NULL;
 5384                 return 0;
 5385         }
 5386 
 5387         /* make structure */
 5388         sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT);
 5389         if (sah->idents == NULL) {
 5390                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
 5391                 return ENOBUFS;
 5392         }
 5393         sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT);
 5394         if (sah->identd == NULL) {
 5395                 free(sah->idents, M_IPSEC_MISC);
 5396                 sah->idents = NULL;
 5397                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
 5398                 return ENOBUFS;
 5399         }
 5400         sah->idents->type = idsrc->sadb_ident_type;
 5401         sah->idents->id = idsrc->sadb_ident_id;
 5402 
 5403         sah->identd->type = iddst->sadb_ident_type;
 5404         sah->identd->id = iddst->sadb_ident_id;
 5405 
 5406         return 0;
 5407 }
 5408 
 5409 /*
 5410  * m will not be freed on return.
 5411  * it is caller's responsibility to free the result. 
 5412  */
 5413 static struct mbuf *
 5414 key_getmsgbuf_x1(struct mbuf *m, const struct sadb_msghdr *mhp)
 5415 {
 5416         struct mbuf *n;
 5417 
 5418         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 5419         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 5420         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 5421 
 5422         /* create new sadb_msg to reply. */
 5423         n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED,
 5424             SADB_EXT_SA, SADB_X_EXT_SA2,
 5425             SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST,
 5426             SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
 5427             SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST);
 5428         if (!n)
 5429                 return NULL;
 5430 
 5431         if (n->m_len < sizeof(struct sadb_msg)) {
 5432                 n = m_pullup(n, sizeof(struct sadb_msg));
 5433                 if (n == NULL)
 5434                         return NULL;
 5435         }
 5436         mtod(n, struct sadb_msg *)->sadb_msg_errno = 0;
 5437         mtod(n, struct sadb_msg *)->sadb_msg_len =
 5438             PFKEY_UNIT64(n->m_pkthdr.len);
 5439 
 5440         return n;
 5441 }
 5442 
 5443 /*
 5444  * SADB_DELETE processing
 5445  * receive
 5446  *   <base, SA(*), address(SD)>
 5447  * from the ikmpd, and set SADB_SASTATE_DEAD,
 5448  * and send,
 5449  *   <base, SA(*), address(SD)>
 5450  * to the ikmpd.
 5451  *
 5452  * m will always be freed.
 5453  */
 5454 static int
 5455 key_delete(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
 5456 {
 5457         struct sadb_sa *sa0;
 5458         struct sadb_address *src0, *dst0;
 5459         struct secasindex saidx;
 5460         struct secashead *sah;
 5461         struct secasvar *sav = NULL;
 5462         u_int16_t proto;
 5463 
 5464         IPSEC_ASSERT(so != NULL, ("null socket"));
 5465         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 5466         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 5467         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 5468 
 5469         /* map satype to proto */
 5470         if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
 5471                 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
 5472                         __func__));
 5473                 return key_senderror(so, m, EINVAL);
 5474         }
 5475 
 5476         if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
 5477             mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
 5478                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 5479                         __func__));
 5480                 return key_senderror(so, m, EINVAL);
 5481         }
 5482 
 5483         if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
 5484             mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
 5485                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 5486                         __func__));
 5487                 return key_senderror(so, m, EINVAL);
 5488         }
 5489 
 5490         if (mhp->ext[SADB_EXT_SA] == NULL) {
 5491                 /*
 5492                  * Caller wants us to delete all non-LARVAL SAs
 5493                  * that match the src/dst.  This is used during
 5494                  * IKE INITIAL-CONTACT.
 5495                  */
 5496                 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__));
 5497                 return key_delete_all(so, m, mhp, proto);
 5498         } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) {
 5499                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 5500                         __func__));
 5501                 return key_senderror(so, m, EINVAL);
 5502         }
 5503 
 5504         sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
 5505         src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
 5506         dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
 5507 
 5508         /* XXX boundary check against sa_len */
 5509         KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
 5510 
 5511         /*
 5512          * Make sure the port numbers are zero.
 5513          * In case of NAT-T we will update them later if needed.
 5514          */
 5515         KEY_PORTTOSADDR(&saidx.src, 0);
 5516         KEY_PORTTOSADDR(&saidx.dst, 0);
 5517 
 5518 #ifdef IPSEC_NAT_T
 5519         /*
 5520          * Handle NAT-T info if present.
 5521          */
 5522         if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL &&
 5523             mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) {
 5524                 struct sadb_x_nat_t_port *sport, *dport;
 5525 
 5526                 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) ||
 5527                     mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) {
 5528                         ipseclog((LOG_DEBUG, "%s: invalid message.\n",
 5529                             __func__));
 5530                         return key_senderror(so, m, EINVAL);
 5531                 }
 5532 
 5533                 sport = (struct sadb_x_nat_t_port *)
 5534                     mhp->ext[SADB_X_EXT_NAT_T_SPORT];
 5535                 dport = (struct sadb_x_nat_t_port *)
 5536                     mhp->ext[SADB_X_EXT_NAT_T_DPORT];
 5537 
 5538                 if (sport)
 5539                         KEY_PORTTOSADDR(&saidx.src,
 5540                             sport->sadb_x_nat_t_port_port);
 5541                 if (dport)
 5542                         KEY_PORTTOSADDR(&saidx.dst,
 5543                             dport->sadb_x_nat_t_port_port);
 5544         }
 5545 #endif
 5546 
 5547         /* get a SA header */
 5548         SAHTREE_LOCK();
 5549         LIST_FOREACH(sah, &V_sahtree, chain) {
 5550                 if (sah->state == SADB_SASTATE_DEAD)
 5551                         continue;
 5552                 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
 5553                         continue;
 5554 
 5555                 /* get a SA with SPI. */
 5556                 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi);
 5557                 if (sav)
 5558                         break;
 5559         }
 5560         if (sah == NULL) {
 5561                 SAHTREE_UNLOCK();
 5562                 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__));
 5563                 return key_senderror(so, m, ENOENT);
 5564         }
 5565 
 5566         key_sa_chgstate(sav, SADB_SASTATE_DEAD);
 5567         KEY_FREESAV(&sav);
 5568         SAHTREE_UNLOCK();
 5569 
 5570     {
 5571         struct mbuf *n;
 5572         struct sadb_msg *newmsg;
 5573 
 5574         /* create new sadb_msg to reply. */
 5575         /* XXX-BZ NAT-T extensions? */
 5576         n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
 5577             SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
 5578         if (!n)
 5579                 return key_senderror(so, m, ENOBUFS);
 5580 
 5581         if (n->m_len < sizeof(struct sadb_msg)) {
 5582                 n = m_pullup(n, sizeof(struct sadb_msg));
 5583                 if (n == NULL)
 5584                         return key_senderror(so, m, ENOBUFS);
 5585         }
 5586         newmsg = mtod(n, struct sadb_msg *);
 5587         newmsg->sadb_msg_errno = 0;
 5588         newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
 5589 
 5590         m_freem(m);
 5591         return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
 5592     }
 5593 }
 5594 
 5595 /*
 5596  * delete all SAs for src/dst.  Called from key_delete().
 5597  */
 5598 static int
 5599 key_delete_all(struct socket *so, struct mbuf *m,
 5600     const struct sadb_msghdr *mhp, u_int16_t proto)
 5601 {
 5602         struct sadb_address *src0, *dst0;
 5603         struct secasindex saidx;
 5604         struct secashead *sah;
 5605         struct secasvar *sav, *nextsav;
 5606         u_int stateidx, state;
 5607 
 5608         src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
 5609         dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
 5610 
 5611         /* XXX boundary check against sa_len */
 5612         KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
 5613 
 5614         /*
 5615          * Make sure the port numbers are zero.
 5616          * In case of NAT-T we will update them later if needed.
 5617          */
 5618         KEY_PORTTOSADDR(&saidx.src, 0);
 5619         KEY_PORTTOSADDR(&saidx.dst, 0);
 5620 
 5621 #ifdef IPSEC_NAT_T
 5622         /*
 5623          * Handle NAT-T info if present.
 5624          */
 5625 
 5626         if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL &&
 5627             mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) {
 5628                 struct sadb_x_nat_t_port *sport, *dport;
 5629 
 5630                 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) ||
 5631                     mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) {
 5632                         ipseclog((LOG_DEBUG, "%s: invalid message.\n",
 5633                             __func__));
 5634                         return key_senderror(so, m, EINVAL);
 5635                 }
 5636 
 5637                 sport = (struct sadb_x_nat_t_port *)
 5638                     mhp->ext[SADB_X_EXT_NAT_T_SPORT];
 5639                 dport = (struct sadb_x_nat_t_port *)
 5640                     mhp->ext[SADB_X_EXT_NAT_T_DPORT];
 5641 
 5642                 if (sport)
 5643                         KEY_PORTTOSADDR(&saidx.src,
 5644                             sport->sadb_x_nat_t_port_port);
 5645                 if (dport)
 5646                         KEY_PORTTOSADDR(&saidx.dst,
 5647                             dport->sadb_x_nat_t_port_port);
 5648         }
 5649 #endif
 5650 
 5651         SAHTREE_LOCK();
 5652         LIST_FOREACH(sah, &V_sahtree, chain) {
 5653                 if (sah->state == SADB_SASTATE_DEAD)
 5654                         continue;
 5655                 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
 5656                         continue;
 5657 
 5658                 /* Delete all non-LARVAL SAs. */
 5659                 for (stateidx = 0;
 5660                      stateidx < _ARRAYLEN(saorder_state_alive);
 5661                      stateidx++) {
 5662                         state = saorder_state_alive[stateidx];
 5663                         if (state == SADB_SASTATE_LARVAL)
 5664                                 continue;
 5665                         for (sav = LIST_FIRST(&sah->savtree[state]);
 5666                              sav != NULL; sav = nextsav) {
 5667                                 nextsav = LIST_NEXT(sav, chain);
 5668                                 /* sanity check */
 5669                                 if (sav->state != state) {
 5670                                         ipseclog((LOG_DEBUG, "%s: invalid "
 5671                                                 "sav->state (queue %d SA %d)\n",
 5672                                                 __func__, state, sav->state));
 5673                                         continue;
 5674                                 }
 5675                                 
 5676                                 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
 5677                                 KEY_FREESAV(&sav);
 5678                         }
 5679                 }
 5680         }
 5681         SAHTREE_UNLOCK();
 5682     {
 5683         struct mbuf *n;
 5684         struct sadb_msg *newmsg;
 5685 
 5686         /* create new sadb_msg to reply. */
 5687         /* XXX-BZ NAT-T extensions? */
 5688         n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED,
 5689             SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
 5690         if (!n)
 5691                 return key_senderror(so, m, ENOBUFS);
 5692 
 5693         if (n->m_len < sizeof(struct sadb_msg)) {
 5694                 n = m_pullup(n, sizeof(struct sadb_msg));
 5695                 if (n == NULL)
 5696                         return key_senderror(so, m, ENOBUFS);
 5697         }
 5698         newmsg = mtod(n, struct sadb_msg *);
 5699         newmsg->sadb_msg_errno = 0;
 5700         newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
 5701 
 5702         m_freem(m);
 5703         return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
 5704     }
 5705 }
 5706 
 5707 /*
 5708  * SADB_GET processing
 5709  * receive
 5710  *   <base, SA(*), address(SD)>
 5711  * from the ikmpd, and get a SP and a SA to respond,
 5712  * and send,
 5713  *   <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE),
 5714  *       (identity(SD),) (sensitivity)>
 5715  * to the ikmpd.
 5716  *
 5717  * m will always be freed.
 5718  */
 5719 static int
 5720 key_get(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
 5721 {
 5722         struct sadb_sa *sa0;
 5723         struct sadb_address *src0, *dst0;
 5724         struct secasindex saidx;
 5725         struct secashead *sah;
 5726         struct secasvar *sav = NULL;
 5727         u_int16_t proto;
 5728 
 5729         IPSEC_ASSERT(so != NULL, ("null socket"));
 5730         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 5731         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 5732         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 5733 
 5734         /* map satype to proto */
 5735         if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
 5736                 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
 5737                         __func__));
 5738                 return key_senderror(so, m, EINVAL);
 5739         }
 5740 
 5741         if (mhp->ext[SADB_EXT_SA] == NULL ||
 5742             mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
 5743             mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
 5744                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 5745                         __func__));
 5746                 return key_senderror(so, m, EINVAL);
 5747         }
 5748         if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
 5749             mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
 5750             mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
 5751                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 5752                         __func__));
 5753                 return key_senderror(so, m, EINVAL);
 5754         }
 5755 
 5756         sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
 5757         src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
 5758         dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
 5759 
 5760         /* XXX boundary check against sa_len */
 5761         KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
 5762 
 5763         /*
 5764          * Make sure the port numbers are zero.
 5765          * In case of NAT-T we will update them later if needed.
 5766          */
 5767         KEY_PORTTOSADDR(&saidx.src, 0);
 5768         KEY_PORTTOSADDR(&saidx.dst, 0);
 5769 
 5770 #ifdef IPSEC_NAT_T
 5771         /*
 5772          * Handle NAT-T info if present.
 5773          */
 5774 
 5775         if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL &&
 5776             mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) {
 5777                 struct sadb_x_nat_t_port *sport, *dport;
 5778 
 5779                 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) ||
 5780                     mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) {
 5781                         ipseclog((LOG_DEBUG, "%s: invalid message.\n",
 5782                             __func__));
 5783                         return key_senderror(so, m, EINVAL);
 5784                 }
 5785 
 5786                 sport = (struct sadb_x_nat_t_port *)
 5787                     mhp->ext[SADB_X_EXT_NAT_T_SPORT];
 5788                 dport = (struct sadb_x_nat_t_port *)
 5789                     mhp->ext[SADB_X_EXT_NAT_T_DPORT];
 5790 
 5791                 if (sport)
 5792                         KEY_PORTTOSADDR(&saidx.src,
 5793                             sport->sadb_x_nat_t_port_port);
 5794                 if (dport)
 5795                         KEY_PORTTOSADDR(&saidx.dst,
 5796                             dport->sadb_x_nat_t_port_port);
 5797         }
 5798 #endif
 5799 
 5800         /* get a SA header */
 5801         SAHTREE_LOCK();
 5802         LIST_FOREACH(sah, &V_sahtree, chain) {
 5803                 if (sah->state == SADB_SASTATE_DEAD)
 5804                         continue;
 5805                 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
 5806                         continue;
 5807 
 5808                 /* get a SA with SPI. */
 5809                 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi);
 5810                 if (sav)
 5811                         break;
 5812         }
 5813         SAHTREE_UNLOCK();
 5814         if (sah == NULL) {
 5815                 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__));
 5816                 return key_senderror(so, m, ENOENT);
 5817         }
 5818 
 5819     {
 5820         struct mbuf *n;
 5821         u_int8_t satype;
 5822 
 5823         /* map proto to satype */
 5824         if ((satype = key_proto2satype(sah->saidx.proto)) == 0) {
 5825                 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n",
 5826                         __func__));
 5827                 return key_senderror(so, m, EINVAL);
 5828         }
 5829 
 5830         /* create new sadb_msg to reply. */
 5831         n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq,
 5832             mhp->msg->sadb_msg_pid);
 5833         if (!n)
 5834                 return key_senderror(so, m, ENOBUFS);
 5835 
 5836         m_freem(m);
 5837         return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
 5838     }
 5839 }
 5840 
 5841 /* XXX make it sysctl-configurable? */
 5842 static void
 5843 key_getcomb_setlifetime(struct sadb_comb *comb)
 5844 {
 5845 
 5846         comb->sadb_comb_soft_allocations = 1;
 5847         comb->sadb_comb_hard_allocations = 1;
 5848         comb->sadb_comb_soft_bytes = 0;
 5849         comb->sadb_comb_hard_bytes = 0;
 5850         comb->sadb_comb_hard_addtime = 86400;   /* 1 day */
 5851         comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100;
 5852         comb->sadb_comb_soft_usetime = 28800;   /* 8 hours */
 5853         comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100;
 5854 }
 5855 
 5856 /*
 5857  * XXX reorder combinations by preference
 5858  * XXX no idea if the user wants ESP authentication or not
 5859  */
 5860 static struct mbuf *
 5861 key_getcomb_esp()
 5862 {
 5863         struct sadb_comb *comb;
 5864         struct enc_xform *algo;
 5865         struct mbuf *result = NULL, *m, *n;
 5866         int encmin;
 5867         int i, off, o;
 5868         int totlen;
 5869         const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
 5870 
 5871         m = NULL;
 5872         for (i = 1; i <= SADB_EALG_MAX; i++) {
 5873                 algo = esp_algorithm_lookup(i);
 5874                 if (algo == NULL)
 5875                         continue;
 5876 
 5877                 /* discard algorithms with key size smaller than system min */
 5878                 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin)
 5879                         continue;
 5880                 if (_BITS(algo->minkey) < V_ipsec_esp_keymin)
 5881                         encmin = V_ipsec_esp_keymin;
 5882                 else
 5883                         encmin = _BITS(algo->minkey);
 5884 
 5885                 if (V_ipsec_esp_auth)
 5886                         m = key_getcomb_ah();
 5887                 else {
 5888                         IPSEC_ASSERT(l <= MLEN,
 5889                                 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
 5890                         MGET(m, M_NOWAIT, MT_DATA);
 5891                         if (m) {
 5892                                 M_ALIGN(m, l);
 5893                                 m->m_len = l;
 5894                                 m->m_next = NULL;
 5895                                 bzero(mtod(m, caddr_t), m->m_len);
 5896                         }
 5897                 }
 5898                 if (!m)
 5899                         goto fail;
 5900 
 5901                 totlen = 0;
 5902                 for (n = m; n; n = n->m_next)
 5903                         totlen += n->m_len;
 5904                 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l));
 5905 
 5906                 for (off = 0; off < totlen; off += l) {
 5907                         n = m_pulldown(m, off, l, &o);
 5908                         if (!n) {
 5909                                 /* m is already freed */
 5910                                 goto fail;
 5911                         }
 5912                         comb = (struct sadb_comb *)(mtod(n, caddr_t) + o);
 5913                         bzero(comb, sizeof(*comb));
 5914                         key_getcomb_setlifetime(comb);
 5915                         comb->sadb_comb_encrypt = i;
 5916                         comb->sadb_comb_encrypt_minbits = encmin;
 5917                         comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey);
 5918                 }
 5919 
 5920                 if (!result)
 5921                         result = m;
 5922                 else
 5923                         m_cat(result, m);
 5924         }
 5925 
 5926         return result;
 5927 
 5928  fail:
 5929         if (result)
 5930                 m_freem(result);
 5931         return NULL;
 5932 }
 5933 
 5934 static void
 5935 key_getsizes_ah(const struct auth_hash *ah, int alg, u_int16_t* min,
 5936     u_int16_t* max)
 5937 {
 5938 
 5939         *min = *max = ah->keysize;
 5940         if (ah->keysize == 0) {
 5941                 /*
 5942                  * Transform takes arbitrary key size but algorithm
 5943                  * key size is restricted.  Enforce this here.
 5944                  */
 5945                 switch (alg) {
 5946                 case SADB_X_AALG_MD5:   *min = *max = 16; break;
 5947                 case SADB_X_AALG_SHA:   *min = *max = 20; break;
 5948                 case SADB_X_AALG_NULL:  *min = 1; *max = 256; break;
 5949                 case SADB_X_AALG_SHA2_256: *min = *max = 32; break;
 5950                 case SADB_X_AALG_SHA2_384: *min = *max = 48; break;
 5951                 case SADB_X_AALG_SHA2_512: *min = *max = 64; break;
 5952                 default:
 5953                         DPRINTF(("%s: unknown AH algorithm %u\n",
 5954                                 __func__, alg));
 5955                         break;
 5956                 }
 5957         }
 5958 }
 5959 
 5960 /*
 5961  * XXX reorder combinations by preference
 5962  */
 5963 static struct mbuf *
 5964 key_getcomb_ah()
 5965 {
 5966         struct sadb_comb *comb;
 5967         struct auth_hash *algo;
 5968         struct mbuf *m;
 5969         u_int16_t minkeysize, maxkeysize;
 5970         int i;
 5971         const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
 5972 
 5973         m = NULL;
 5974         for (i = 1; i <= SADB_AALG_MAX; i++) {
 5975 #if 1
 5976                 /* we prefer HMAC algorithms, not old algorithms */
 5977                 if (i != SADB_AALG_SHA1HMAC &&
 5978                     i != SADB_AALG_MD5HMAC  &&
 5979                     i != SADB_X_AALG_SHA2_256 &&
 5980                     i != SADB_X_AALG_SHA2_384 &&
 5981                     i != SADB_X_AALG_SHA2_512)
 5982                         continue;
 5983 #endif
 5984                 algo = ah_algorithm_lookup(i);
 5985                 if (!algo)
 5986                         continue;
 5987                 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize);
 5988                 /* discard algorithms with key size smaller than system min */
 5989                 if (_BITS(minkeysize) < V_ipsec_ah_keymin)
 5990                         continue;
 5991 
 5992                 if (!m) {
 5993                         IPSEC_ASSERT(l <= MLEN,
 5994                                 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
 5995                         MGET(m, M_NOWAIT, MT_DATA);
 5996                         if (m) {
 5997                                 M_ALIGN(m, l);
 5998                                 m->m_len = l;
 5999                                 m->m_next = NULL;
 6000                         }
 6001                 } else
 6002                         M_PREPEND(m, l, M_NOWAIT);
 6003                 if (!m)
 6004                         return NULL;
 6005 
 6006                 comb = mtod(m, struct sadb_comb *);
 6007                 bzero(comb, sizeof(*comb));
 6008                 key_getcomb_setlifetime(comb);
 6009                 comb->sadb_comb_auth = i;
 6010                 comb->sadb_comb_auth_minbits = _BITS(minkeysize);
 6011                 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize);
 6012         }
 6013 
 6014         return m;
 6015 }
 6016 
 6017 /*
 6018  * not really an official behavior.  discussed in pf_key@inner.net in Sep2000.
 6019  * XXX reorder combinations by preference
 6020  */
 6021 static struct mbuf *
 6022 key_getcomb_ipcomp()
 6023 {
 6024         struct sadb_comb *comb;
 6025         struct comp_algo *algo;
 6026         struct mbuf *m;
 6027         int i;
 6028         const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
 6029 
 6030         m = NULL;
 6031         for (i = 1; i <= SADB_X_CALG_MAX; i++) {
 6032                 algo = ipcomp_algorithm_lookup(i);
 6033                 if (!algo)
 6034                         continue;
 6035 
 6036                 if (!m) {
 6037                         IPSEC_ASSERT(l <= MLEN,
 6038                                 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
 6039                         MGET(m, M_NOWAIT, MT_DATA);
 6040                         if (m) {
 6041                                 M_ALIGN(m, l);
 6042                                 m->m_len = l;
 6043                                 m->m_next = NULL;
 6044                         }
 6045                 } else
 6046                         M_PREPEND(m, l, M_NOWAIT);
 6047                 if (!m)
 6048                         return NULL;
 6049 
 6050                 comb = mtod(m, struct sadb_comb *);
 6051                 bzero(comb, sizeof(*comb));
 6052                 key_getcomb_setlifetime(comb);
 6053                 comb->sadb_comb_encrypt = i;
 6054                 /* what should we set into sadb_comb_*_{min,max}bits? */
 6055         }
 6056 
 6057         return m;
 6058 }
 6059 
 6060 /*
 6061  * XXX no way to pass mode (transport/tunnel) to userland
 6062  * XXX replay checking?
 6063  * XXX sysctl interface to ipsec_{ah,esp}_keymin
 6064  */
 6065 static struct mbuf *
 6066 key_getprop(const struct secasindex *saidx)
 6067 {
 6068         struct sadb_prop *prop;
 6069         struct mbuf *m, *n;
 6070         const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop));
 6071         int totlen;
 6072 
 6073         switch (saidx->proto)  {
 6074         case IPPROTO_ESP:
 6075                 m = key_getcomb_esp();
 6076                 break;
 6077         case IPPROTO_AH:
 6078                 m = key_getcomb_ah();
 6079                 break;
 6080         case IPPROTO_IPCOMP:
 6081                 m = key_getcomb_ipcomp();
 6082                 break;
 6083         default:
 6084                 return NULL;
 6085         }
 6086 
 6087         if (!m)
 6088                 return NULL;
 6089         M_PREPEND(m, l, M_NOWAIT);
 6090         if (!m)
 6091                 return NULL;
 6092 
 6093         totlen = 0;
 6094         for (n = m; n; n = n->m_next)
 6095                 totlen += n->m_len;
 6096 
 6097         prop = mtod(m, struct sadb_prop *);
 6098         bzero(prop, sizeof(*prop));
 6099         prop->sadb_prop_len = PFKEY_UNIT64(totlen);
 6100         prop->sadb_prop_exttype = SADB_EXT_PROPOSAL;
 6101         prop->sadb_prop_replay = 32;    /* XXX */
 6102 
 6103         return m;
 6104 }
 6105 
 6106 /*
 6107  * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2().
 6108  * send
 6109  *   <base, SA, address(SD), (address(P)), x_policy,
 6110  *       (identity(SD),) (sensitivity,) proposal>
 6111  * to KMD, and expect to receive
 6112  *   <base> with SADB_ACQUIRE if error occured,
 6113  * or
 6114  *   <base, src address, dst address, (SPI range)> with SADB_GETSPI
 6115  * from KMD by PF_KEY.
 6116  *
 6117  * XXX x_policy is outside of RFC2367 (KAME extension).
 6118  * XXX sensitivity is not supported.
 6119  * XXX for ipcomp, RFC2367 does not define how to fill in proposal.
 6120  * see comment for key_getcomb_ipcomp().
 6121  *
 6122  * OUT:
 6123  *    0     : succeed
 6124  *    others: error number
 6125  */
 6126 static int
 6127 key_acquire(const struct secasindex *saidx, struct secpolicy *sp)
 6128 {
 6129         struct mbuf *result = NULL, *m;
 6130         struct secacq *newacq;
 6131         u_int8_t satype;
 6132         int error = -1;
 6133         u_int32_t seq;
 6134 
 6135         IPSEC_ASSERT(saidx != NULL, ("null saidx"));
 6136         satype = key_proto2satype(saidx->proto);
 6137         IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto));
 6138 
 6139         /*
 6140          * We never do anything about acquirng SA.  There is anather
 6141          * solution that kernel blocks to send SADB_ACQUIRE message until
 6142          * getting something message from IKEd.  In later case, to be
 6143          * managed with ACQUIRING list.
 6144          */
 6145         /* Get an entry to check whether sending message or not. */
 6146         if ((newacq = key_getacq(saidx)) != NULL) {
 6147                 if (V_key_blockacq_count < newacq->count) {
 6148                         /* reset counter and do send message. */
 6149                         newacq->count = 0;
 6150                 } else {
 6151                         /* increment counter and do nothing. */
 6152                         newacq->count++;
 6153                         return 0;
 6154                 }
 6155         } else {
 6156                 /* make new entry for blocking to send SADB_ACQUIRE. */
 6157                 if ((newacq = key_newacq(saidx)) == NULL)
 6158                         return ENOBUFS;
 6159         }
 6160 
 6161 
 6162         seq = newacq->seq;
 6163         m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0);
 6164         if (!m) {
 6165                 error = ENOBUFS;
 6166                 goto fail;
 6167         }
 6168         result = m;
 6169 
 6170         /*
 6171          * No SADB_X_EXT_NAT_T_* here: we do not know
 6172          * anything related to NAT-T at this time.
 6173          */
 6174 
 6175         /* set sadb_address for saidx's. */
 6176         m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
 6177             &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY);
 6178         if (!m) {
 6179                 error = ENOBUFS;
 6180                 goto fail;
 6181         }
 6182         m_cat(result, m);
 6183 
 6184         m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
 6185             &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY);
 6186         if (!m) {
 6187                 error = ENOBUFS;
 6188                 goto fail;
 6189         }
 6190         m_cat(result, m);
 6191 
 6192         /* XXX proxy address (optional) */
 6193 
 6194         /* set sadb_x_policy */
 6195         if (sp) {
 6196                 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id);
 6197                 if (!m) {
 6198                         error = ENOBUFS;
 6199                         goto fail;
 6200                 }
 6201                 m_cat(result, m);
 6202         }
 6203 
 6204         /* XXX identity (optional) */
 6205 #if 0
 6206         if (idexttype && fqdn) {
 6207                 /* create identity extension (FQDN) */
 6208                 struct sadb_ident *id;
 6209                 int fqdnlen;
 6210 
 6211                 fqdnlen = strlen(fqdn) + 1;     /* +1 for terminating-NUL */
 6212                 id = (struct sadb_ident *)p;
 6213                 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
 6214                 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
 6215                 id->sadb_ident_exttype = idexttype;
 6216                 id->sadb_ident_type = SADB_IDENTTYPE_FQDN;
 6217                 bcopy(fqdn, id + 1, fqdnlen);
 6218                 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen);
 6219         }
 6220 
 6221         if (idexttype) {
 6222                 /* create identity extension (USERFQDN) */
 6223                 struct sadb_ident *id;
 6224                 int userfqdnlen;
 6225 
 6226                 if (userfqdn) {
 6227                         /* +1 for terminating-NUL */
 6228                         userfqdnlen = strlen(userfqdn) + 1;
 6229                 } else
 6230                         userfqdnlen = 0;
 6231                 id = (struct sadb_ident *)p;
 6232                 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
 6233                 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
 6234                 id->sadb_ident_exttype = idexttype;
 6235                 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN;
 6236                 /* XXX is it correct? */
 6237                 if (curproc && curproc->p_cred)
 6238                         id->sadb_ident_id = curproc->p_cred->p_ruid;
 6239                 if (userfqdn && userfqdnlen)
 6240                         bcopy(userfqdn, id + 1, userfqdnlen);
 6241                 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen);
 6242         }
 6243 #endif
 6244 
 6245         /* XXX sensitivity (optional) */
 6246 
 6247         /* create proposal/combination extension */
 6248         m = key_getprop(saidx);
 6249 #if 0
 6250         /*
 6251          * spec conformant: always attach proposal/combination extension,
 6252          * the problem is that we have no way to attach it for ipcomp,
 6253          * due to the way sadb_comb is declared in RFC2367.
 6254          */
 6255         if (!m) {
 6256                 error = ENOBUFS;
 6257                 goto fail;
 6258         }
 6259         m_cat(result, m);
 6260 #else
 6261         /*
 6262          * outside of spec; make proposal/combination extension optional.
 6263          */
 6264         if (m)
 6265                 m_cat(result, m);
 6266 #endif
 6267 
 6268         if ((result->m_flags & M_PKTHDR) == 0) {
 6269                 error = EINVAL;
 6270                 goto fail;
 6271         }
 6272 
 6273         if (result->m_len < sizeof(struct sadb_msg)) {
 6274                 result = m_pullup(result, sizeof(struct sadb_msg));
 6275                 if (result == NULL) {
 6276                         error = ENOBUFS;
 6277                         goto fail;
 6278                 }
 6279         }
 6280 
 6281         result->m_pkthdr.len = 0;
 6282         for (m = result; m; m = m->m_next)
 6283                 result->m_pkthdr.len += m->m_len;
 6284 
 6285         mtod(result, struct sadb_msg *)->sadb_msg_len =
 6286             PFKEY_UNIT64(result->m_pkthdr.len);
 6287 
 6288         return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
 6289 
 6290  fail:
 6291         if (result)
 6292                 m_freem(result);
 6293         return error;
 6294 }
 6295 
 6296 static struct secacq *
 6297 key_newacq(const struct secasindex *saidx)
 6298 {
 6299         struct secacq *newacq;
 6300 
 6301         /* get new entry */
 6302         newacq = malloc(sizeof(struct secacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO);
 6303         if (newacq == NULL) {
 6304                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
 6305                 return NULL;
 6306         }
 6307 
 6308         /* copy secindex */
 6309         bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx));
 6310         newacq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq);
 6311         newacq->created = time_second;
 6312         newacq->count = 0;
 6313 
 6314         /* add to acqtree */
 6315         ACQ_LOCK();
 6316         LIST_INSERT_HEAD(&V_acqtree, newacq, chain);
 6317         ACQ_UNLOCK();
 6318 
 6319         return newacq;
 6320 }
 6321 
 6322 static struct secacq *
 6323 key_getacq(const struct secasindex *saidx)
 6324 {
 6325         struct secacq *acq;
 6326 
 6327         ACQ_LOCK();
 6328         LIST_FOREACH(acq, &V_acqtree, chain) {
 6329                 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY))
 6330                         break;
 6331         }
 6332         ACQ_UNLOCK();
 6333 
 6334         return acq;
 6335 }
 6336 
 6337 static struct secacq *
 6338 key_getacqbyseq(u_int32_t seq)
 6339 {
 6340         struct secacq *acq;
 6341 
 6342         ACQ_LOCK();
 6343         LIST_FOREACH(acq, &V_acqtree, chain) {
 6344                 if (acq->seq == seq)
 6345                         break;
 6346         }
 6347         ACQ_UNLOCK();
 6348 
 6349         return acq;
 6350 }
 6351 
 6352 static struct secspacq *
 6353 key_newspacq(struct secpolicyindex *spidx)
 6354 {
 6355         struct secspacq *acq;
 6356 
 6357         /* get new entry */
 6358         acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO);
 6359         if (acq == NULL) {
 6360                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
 6361                 return NULL;
 6362         }
 6363 
 6364         /* copy secindex */
 6365         bcopy(spidx, &acq->spidx, sizeof(acq->spidx));
 6366         acq->created = time_second;
 6367         acq->count = 0;
 6368 
 6369         /* add to spacqtree */
 6370         SPACQ_LOCK();
 6371         LIST_INSERT_HEAD(&V_spacqtree, acq, chain);
 6372         SPACQ_UNLOCK();
 6373 
 6374         return acq;
 6375 }
 6376 
 6377 static struct secspacq *
 6378 key_getspacq(struct secpolicyindex *spidx)
 6379 {
 6380         struct secspacq *acq;
 6381 
 6382         SPACQ_LOCK();
 6383         LIST_FOREACH(acq, &V_spacqtree, chain) {
 6384                 if (key_cmpspidx_exactly(spidx, &acq->spidx)) {
 6385                         /* NB: return holding spacq_lock */
 6386                         return acq;
 6387                 }
 6388         }
 6389         SPACQ_UNLOCK();
 6390 
 6391         return NULL;
 6392 }
 6393 
 6394 /*
 6395  * SADB_ACQUIRE processing,
 6396  * in first situation, is receiving
 6397  *   <base>
 6398  * from the ikmpd, and clear sequence of its secasvar entry.
 6399  *
 6400  * In second situation, is receiving
 6401  *   <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
 6402  * from a user land process, and return
 6403  *   <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
 6404  * to the socket.
 6405  *
 6406  * m will always be freed.
 6407  */
 6408 static int
 6409 key_acquire2(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
 6410 {
 6411         const struct sadb_address *src0, *dst0;
 6412         struct secasindex saidx;
 6413         struct secashead *sah;
 6414         u_int16_t proto;
 6415         int error;
 6416 
 6417         IPSEC_ASSERT(so != NULL, ("null socket"));
 6418         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 6419         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 6420         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 6421 
 6422         /*
 6423          * Error message from KMd.
 6424          * We assume that if error was occured in IKEd, the length of PFKEY
 6425          * message is equal to the size of sadb_msg structure.
 6426          * We do not raise error even if error occured in this function.
 6427          */
 6428         if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) {
 6429                 struct secacq *acq;
 6430 
 6431                 /* check sequence number */
 6432                 if (mhp->msg->sadb_msg_seq == 0) {
 6433                         ipseclog((LOG_DEBUG, "%s: must specify sequence "
 6434                                 "number.\n", __func__));
 6435                         m_freem(m);
 6436                         return 0;
 6437                 }
 6438 
 6439                 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) {
 6440                         /*
 6441                          * the specified larval SA is already gone, or we got
 6442                          * a bogus sequence number.  we can silently ignore it.
 6443                          */
 6444                         m_freem(m);
 6445                         return 0;
 6446                 }
 6447 
 6448                 /* reset acq counter in order to deletion by timehander. */
 6449                 acq->created = time_second;
 6450                 acq->count = 0;
 6451                 m_freem(m);
 6452                 return 0;
 6453         }
 6454 
 6455         /*
 6456          * This message is from user land.
 6457          */
 6458 
 6459         /* map satype to proto */
 6460         if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
 6461                 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
 6462                         __func__));
 6463                 return key_senderror(so, m, EINVAL);
 6464         }
 6465 
 6466         if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
 6467             mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
 6468             mhp->ext[SADB_EXT_PROPOSAL] == NULL) {
 6469                 /* error */
 6470                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
 6471                         __func__));
 6472                 return key_senderror(so, m, EINVAL);
 6473         }
 6474         if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
 6475             mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) ||
 6476             mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) {
 6477                 /* error */
 6478                 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",        
 6479                         __func__));
 6480                 return key_senderror(so, m, EINVAL);
 6481         }
 6482 
 6483         src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
 6484         dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
 6485 
 6486         /* XXX boundary check against sa_len */
 6487         KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
 6488 
 6489         /*
 6490          * Make sure the port numbers are zero.
 6491          * In case of NAT-T we will update them later if needed.
 6492          */
 6493         KEY_PORTTOSADDR(&saidx.src, 0);
 6494         KEY_PORTTOSADDR(&saidx.dst, 0);
 6495 
 6496 #ifndef IPSEC_NAT_T
 6497         /*
 6498          * Handle NAT-T info if present.
 6499          */
 6500 
 6501         if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL &&
 6502             mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) {
 6503                 struct sadb_x_nat_t_port *sport, *dport;
 6504 
 6505                 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) ||
 6506                     mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) {
 6507                         ipseclog((LOG_DEBUG, "%s: invalid message.\n",
 6508                             __func__));
 6509                         return key_senderror(so, m, EINVAL);
 6510                 }
 6511 
 6512                 sport = (struct sadb_x_nat_t_port *)
 6513                     mhp->ext[SADB_X_EXT_NAT_T_SPORT];
 6514                 dport = (struct sadb_x_nat_t_port *)
 6515                     mhp->ext[SADB_X_EXT_NAT_T_DPORT];
 6516 
 6517                 if (sport)
 6518                         KEY_PORTTOSADDR(&saidx.src,
 6519                             sport->sadb_x_nat_t_port_port);
 6520                 if (dport)
 6521                         KEY_PORTTOSADDR(&saidx.dst,
 6522                             dport->sadb_x_nat_t_port_port);
 6523         }
 6524 #endif
 6525 
 6526         /* get a SA index */
 6527         SAHTREE_LOCK();
 6528         LIST_FOREACH(sah, &V_sahtree, chain) {
 6529                 if (sah->state == SADB_SASTATE_DEAD)
 6530                         continue;
 6531                 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID))
 6532                         break;
 6533         }
 6534         SAHTREE_UNLOCK();
 6535         if (sah != NULL) {
 6536                 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__));
 6537                 return key_senderror(so, m, EEXIST);
 6538         }
 6539 
 6540         error = key_acquire(&saidx, NULL);
 6541         if (error != 0) {
 6542                 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n",
 6543                         __func__, mhp->msg->sadb_msg_errno));
 6544                 return key_senderror(so, m, error);
 6545         }
 6546 
 6547         return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED);
 6548 }
 6549 
 6550 /*
 6551  * SADB_REGISTER processing.
 6552  * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported.
 6553  * receive
 6554  *   <base>
 6555  * from the ikmpd, and register a socket to send PF_KEY messages,
 6556  * and send
 6557  *   <base, supported>
 6558  * to KMD by PF_KEY.
 6559  * If socket is detached, must free from regnode.
 6560  *
 6561  * m will always be freed.
 6562  */
 6563 static int
 6564 key_register(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
 6565 {
 6566         struct secreg *reg, *newreg = 0;
 6567 
 6568         IPSEC_ASSERT(so != NULL, ("null socket"));
 6569         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 6570         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 6571         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 6572 
 6573         /* check for invalid register message */
 6574         if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0]))
 6575                 return key_senderror(so, m, EINVAL);
 6576 
 6577         /* When SATYPE_UNSPEC is specified, only return sabd_supported. */
 6578         if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC)
 6579                 goto setmsg;
 6580 
 6581         /* check whether existing or not */
 6582         REGTREE_LOCK();
 6583         LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) {
 6584                 if (reg->so == so) {
 6585                         REGTREE_UNLOCK();
 6586                         ipseclog((LOG_DEBUG, "%s: socket exists already.\n",
 6587                                 __func__));
 6588                         return key_senderror(so, m, EEXIST);
 6589                 }
 6590         }
 6591 
 6592         /* create regnode */
 6593         newreg =  malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO);
 6594         if (newreg == NULL) {
 6595                 REGTREE_UNLOCK();
 6596                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
 6597                 return key_senderror(so, m, ENOBUFS);
 6598         }
 6599 
 6600         newreg->so = so;
 6601         ((struct keycb *)sotorawcb(so))->kp_registered++;
 6602 
 6603         /* add regnode to regtree. */
 6604         LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain);
 6605         REGTREE_UNLOCK();
 6606 
 6607   setmsg:
 6608     {
 6609         struct mbuf *n;
 6610         struct sadb_msg *newmsg;
 6611         struct sadb_supported *sup;
 6612         u_int len, alen, elen;
 6613         int off;
 6614         int i;
 6615         struct sadb_alg *alg;
 6616 
 6617         /* create new sadb_msg to reply. */
 6618         alen = 0;
 6619         for (i = 1; i <= SADB_AALG_MAX; i++) {
 6620                 if (ah_algorithm_lookup(i))
 6621                         alen += sizeof(struct sadb_alg);
 6622         }
 6623         if (alen)
 6624                 alen += sizeof(struct sadb_supported);
 6625         elen = 0;
 6626         for (i = 1; i <= SADB_EALG_MAX; i++) {
 6627                 if (esp_algorithm_lookup(i))
 6628                         elen += sizeof(struct sadb_alg);
 6629         }
 6630         if (elen)
 6631                 elen += sizeof(struct sadb_supported);
 6632 
 6633         len = sizeof(struct sadb_msg) + alen + elen;
 6634 
 6635         if (len > MCLBYTES)
 6636                 return key_senderror(so, m, ENOBUFS);
 6637 
 6638         MGETHDR(n, M_NOWAIT, MT_DATA);
 6639         if (len > MHLEN) {
 6640                 if (!(MCLGET(n, M_NOWAIT))) {
 6641                         m_freem(n);
 6642                         n = NULL;
 6643                 }
 6644         }
 6645         if (!n)
 6646                 return key_senderror(so, m, ENOBUFS);
 6647 
 6648         n->m_pkthdr.len = n->m_len = len;
 6649         n->m_next = NULL;
 6650         off = 0;
 6651 
 6652         m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
 6653         newmsg = mtod(n, struct sadb_msg *);
 6654         newmsg->sadb_msg_errno = 0;
 6655         newmsg->sadb_msg_len = PFKEY_UNIT64(len);
 6656         off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
 6657 
 6658         /* for authentication algorithm */
 6659         if (alen) {
 6660                 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
 6661                 sup->sadb_supported_len = PFKEY_UNIT64(alen);
 6662                 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
 6663                 off += PFKEY_ALIGN8(sizeof(*sup));
 6664 
 6665                 for (i = 1; i <= SADB_AALG_MAX; i++) {
 6666                         struct auth_hash *aalgo;
 6667                         u_int16_t minkeysize, maxkeysize;
 6668 
 6669                         aalgo = ah_algorithm_lookup(i);
 6670                         if (!aalgo)
 6671                                 continue;
 6672                         alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
 6673                         alg->sadb_alg_id = i;
 6674                         alg->sadb_alg_ivlen = 0;
 6675                         key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize);
 6676                         alg->sadb_alg_minbits = _BITS(minkeysize);
 6677                         alg->sadb_alg_maxbits = _BITS(maxkeysize);
 6678                         off += PFKEY_ALIGN8(sizeof(*alg));
 6679                 }
 6680         }
 6681 
 6682         /* for encryption algorithm */
 6683         if (elen) {
 6684                 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
 6685                 sup->sadb_supported_len = PFKEY_UNIT64(elen);
 6686                 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
 6687                 off += PFKEY_ALIGN8(sizeof(*sup));
 6688 
 6689                 for (i = 1; i <= SADB_EALG_MAX; i++) {
 6690                         struct enc_xform *ealgo;
 6691 
 6692                         ealgo = esp_algorithm_lookup(i);
 6693                         if (!ealgo)
 6694                                 continue;
 6695                         alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
 6696                         alg->sadb_alg_id = i;
 6697                         alg->sadb_alg_ivlen = ealgo->blocksize;
 6698                         alg->sadb_alg_minbits = _BITS(ealgo->minkey);
 6699                         alg->sadb_alg_maxbits = _BITS(ealgo->maxkey);
 6700                         off += PFKEY_ALIGN8(sizeof(struct sadb_alg));
 6701                 }
 6702         }
 6703 
 6704         IPSEC_ASSERT(off == len,
 6705                 ("length assumption failed (off %u len %u)", off, len));
 6706 
 6707         m_freem(m);
 6708         return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED);
 6709     }
 6710 }
 6711 
 6712 /*
 6713  * free secreg entry registered.
 6714  * XXX: I want to do free a socket marked done SADB_RESIGER to socket.
 6715  */
 6716 void
 6717 key_freereg(struct socket *so)
 6718 {
 6719         struct secreg *reg;
 6720         int i;
 6721 
 6722         IPSEC_ASSERT(so != NULL, ("NULL so"));
 6723 
 6724         /*
 6725          * check whether existing or not.
 6726          * check all type of SA, because there is a potential that
 6727          * one socket is registered to multiple type of SA.
 6728          */
 6729         REGTREE_LOCK();
 6730         for (i = 0; i <= SADB_SATYPE_MAX; i++) {
 6731                 LIST_FOREACH(reg, &V_regtree[i], chain) {
 6732                         if (reg->so == so && __LIST_CHAINED(reg)) {
 6733                                 LIST_REMOVE(reg, chain);
 6734                                 free(reg, M_IPSEC_SAR);
 6735                                 break;
 6736                         }
 6737                 }
 6738         }
 6739         REGTREE_UNLOCK();
 6740 }
 6741 
 6742 /*
 6743  * SADB_EXPIRE processing
 6744  * send
 6745  *   <base, SA, SA2, lifetime(C and one of HS), address(SD)>
 6746  * to KMD by PF_KEY.
 6747  * NOTE: We send only soft lifetime extension.
 6748  *
 6749  * OUT: 0       : succeed
 6750  *      others  : error number
 6751  */
 6752 static int
 6753 key_expire(struct secasvar *sav)
 6754 {
 6755         int satype;
 6756         struct mbuf *result = NULL, *m;
 6757         int len;
 6758         int error = -1;
 6759         struct sadb_lifetime *lt;
 6760 
 6761         IPSEC_ASSERT (sav != NULL, ("null sav"));
 6762         IPSEC_ASSERT (sav->sah != NULL, ("null sa header"));
 6763 
 6764         /* set msg header */
 6765         satype = key_proto2satype(sav->sah->saidx.proto);
 6766         IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype));
 6767         m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt);
 6768         if (!m) {
 6769                 error = ENOBUFS;
 6770                 goto fail;
 6771         }
 6772         result = m;
 6773 
 6774         /* create SA extension */
 6775         m = key_setsadbsa(sav);
 6776         if (!m) {
 6777                 error = ENOBUFS;
 6778                 goto fail;
 6779         }
 6780         m_cat(result, m);
 6781 
 6782         /* create SA extension */
 6783         m = key_setsadbxsa2(sav->sah->saidx.mode,
 6784                         sav->replay ? sav->replay->count : 0,
 6785                         sav->sah->saidx.reqid);
 6786         if (!m) {
 6787                 error = ENOBUFS;
 6788                 goto fail;
 6789         }
 6790         m_cat(result, m);
 6791 
 6792         /* create lifetime extension (current and soft) */
 6793         len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
 6794         m = m_get2(len, M_NOWAIT, MT_DATA, 0);
 6795         if (m == NULL) {
 6796                 error = ENOBUFS;
 6797                 goto fail;
 6798         }
 6799         m_align(m, len);
 6800         m->m_len = len;
 6801         bzero(mtod(m, caddr_t), len);
 6802         lt = mtod(m, struct sadb_lifetime *);
 6803         lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
 6804         lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 6805         lt->sadb_lifetime_allocations = sav->lft_c->allocations;
 6806         lt->sadb_lifetime_bytes = sav->lft_c->bytes;
 6807         lt->sadb_lifetime_addtime = sav->lft_c->addtime;
 6808         lt->sadb_lifetime_usetime = sav->lft_c->usetime;
 6809         lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
 6810         lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
 6811         lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 6812         lt->sadb_lifetime_allocations = sav->lft_s->allocations;
 6813         lt->sadb_lifetime_bytes = sav->lft_s->bytes;
 6814         lt->sadb_lifetime_addtime = sav->lft_s->addtime;
 6815         lt->sadb_lifetime_usetime = sav->lft_s->usetime;
 6816         m_cat(result, m);
 6817 
 6818         /* set sadb_address for source */
 6819         m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
 6820             &sav->sah->saidx.src.sa,
 6821             FULLMASK, IPSEC_ULPROTO_ANY);
 6822         if (!m) {
 6823                 error = ENOBUFS;
 6824                 goto fail;
 6825         }
 6826         m_cat(result, m);
 6827 
 6828         /* set sadb_address for destination */
 6829         m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
 6830             &sav->sah->saidx.dst.sa,
 6831             FULLMASK, IPSEC_ULPROTO_ANY);
 6832         if (!m) {
 6833                 error = ENOBUFS;
 6834                 goto fail;
 6835         }
 6836         m_cat(result, m);
 6837 
 6838         /*
 6839          * XXX-BZ Handle NAT-T extensions here.
 6840          */
 6841 
 6842         if ((result->m_flags & M_PKTHDR) == 0) {
 6843                 error = EINVAL;
 6844                 goto fail;
 6845         }
 6846 
 6847         if (result->m_len < sizeof(struct sadb_msg)) {
 6848                 result = m_pullup(result, sizeof(struct sadb_msg));
 6849                 if (result == NULL) {
 6850                         error = ENOBUFS;
 6851                         goto fail;
 6852                 }
 6853         }
 6854 
 6855         result->m_pkthdr.len = 0;
 6856         for (m = result; m; m = m->m_next)
 6857                 result->m_pkthdr.len += m->m_len;
 6858 
 6859         mtod(result, struct sadb_msg *)->sadb_msg_len =
 6860             PFKEY_UNIT64(result->m_pkthdr.len);
 6861 
 6862         return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
 6863 
 6864  fail:
 6865         if (result)
 6866                 m_freem(result);
 6867         return error;
 6868 }
 6869 
 6870 /*
 6871  * SADB_FLUSH processing
 6872  * receive
 6873  *   <base>
 6874  * from the ikmpd, and free all entries in secastree.
 6875  * and send,
 6876  *   <base>
 6877  * to the ikmpd.
 6878  * NOTE: to do is only marking SADB_SASTATE_DEAD.
 6879  *
 6880  * m will always be freed.
 6881  */
 6882 static int
 6883 key_flush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
 6884 {
 6885         struct sadb_msg *newmsg;
 6886         struct secashead *sah, *nextsah;
 6887         struct secasvar *sav, *nextsav;
 6888         u_int16_t proto;
 6889         u_int8_t state;
 6890         u_int stateidx;
 6891 
 6892         IPSEC_ASSERT(so != NULL, ("null socket"));
 6893         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 6894         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 6895 
 6896         /* map satype to proto */
 6897         if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
 6898                 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
 6899                         __func__));
 6900                 return key_senderror(so, m, EINVAL);
 6901         }
 6902 
 6903         /* no SATYPE specified, i.e. flushing all SA. */
 6904         SAHTREE_LOCK();
 6905         for (sah = LIST_FIRST(&V_sahtree);
 6906              sah != NULL;
 6907              sah = nextsah) {
 6908                 nextsah = LIST_NEXT(sah, chain);
 6909 
 6910                 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC
 6911                  && proto != sah->saidx.proto)
 6912                         continue;
 6913 
 6914                 for (stateidx = 0;
 6915                      stateidx < _ARRAYLEN(saorder_state_alive);
 6916                      stateidx++) {
 6917                         state = saorder_state_any[stateidx];
 6918                         for (sav = LIST_FIRST(&sah->savtree[state]);
 6919                              sav != NULL;
 6920                              sav = nextsav) {
 6921 
 6922                                 nextsav = LIST_NEXT(sav, chain);
 6923 
 6924                                 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
 6925                                 KEY_FREESAV(&sav);
 6926                         }
 6927                 }
 6928 
 6929                 sah->state = SADB_SASTATE_DEAD;
 6930         }
 6931         SAHTREE_UNLOCK();
 6932 
 6933         if (m->m_len < sizeof(struct sadb_msg) ||
 6934             sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
 6935                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
 6936                 return key_senderror(so, m, ENOBUFS);
 6937         }
 6938 
 6939         if (m->m_next)
 6940                 m_freem(m->m_next);
 6941         m->m_next = NULL;
 6942         m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg);
 6943         newmsg = mtod(m, struct sadb_msg *);
 6944         newmsg->sadb_msg_errno = 0;
 6945         newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
 6946 
 6947         return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
 6948 }
 6949 
 6950 /*
 6951  * SADB_DUMP processing
 6952  * dump all entries including status of DEAD in SAD.
 6953  * receive
 6954  *   <base>
 6955  * from the ikmpd, and dump all secasvar leaves
 6956  * and send,
 6957  *   <base> .....
 6958  * to the ikmpd.
 6959  *
 6960  * m will always be freed.
 6961  */
 6962 static int
 6963 key_dump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
 6964 {
 6965         struct secashead *sah;
 6966         struct secasvar *sav;
 6967         u_int16_t proto;
 6968         u_int stateidx;
 6969         u_int8_t satype;
 6970         u_int8_t state;
 6971         int cnt;
 6972         struct sadb_msg *newmsg;
 6973         struct mbuf *n;
 6974 
 6975         IPSEC_ASSERT(so != NULL, ("null socket"));
 6976         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 6977         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 6978         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 6979 
 6980         /* map satype to proto */
 6981         if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
 6982                 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
 6983                         __func__));
 6984                 return key_senderror(so, m, EINVAL);
 6985         }
 6986 
 6987         /* count sav entries to be sent to the userland. */
 6988         cnt = 0;
 6989         SAHTREE_LOCK();
 6990         LIST_FOREACH(sah, &V_sahtree, chain) {
 6991                 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC
 6992                  && proto != sah->saidx.proto)
 6993                         continue;
 6994 
 6995                 for (stateidx = 0;
 6996                      stateidx < _ARRAYLEN(saorder_state_any);
 6997                      stateidx++) {
 6998                         state = saorder_state_any[stateidx];
 6999                         LIST_FOREACH(sav, &sah->savtree[state], chain) {
 7000                                 cnt++;
 7001                         }
 7002                 }
 7003         }
 7004 
 7005         if (cnt == 0) {
 7006                 SAHTREE_UNLOCK();
 7007                 return key_senderror(so, m, ENOENT);
 7008         }
 7009 
 7010         /* send this to the userland, one at a time. */
 7011         newmsg = NULL;
 7012         LIST_FOREACH(sah, &V_sahtree, chain) {
 7013                 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC
 7014                  && proto != sah->saidx.proto)
 7015                         continue;
 7016 
 7017                 /* map proto to satype */
 7018                 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) {
 7019                         SAHTREE_UNLOCK();
 7020                         ipseclog((LOG_DEBUG, "%s: there was invalid proto in "
 7021                                 "SAD.\n", __func__));
 7022                         return key_senderror(so, m, EINVAL);
 7023                 }
 7024 
 7025                 for (stateidx = 0;
 7026                      stateidx < _ARRAYLEN(saorder_state_any);
 7027                      stateidx++) {
 7028                         state = saorder_state_any[stateidx];
 7029                         LIST_FOREACH(sav, &sah->savtree[state], chain) {
 7030                                 n = key_setdumpsa(sav, SADB_DUMP, satype,
 7031                                     --cnt, mhp->msg->sadb_msg_pid);
 7032                                 if (!n) {
 7033                                         SAHTREE_UNLOCK();
 7034                                         return key_senderror(so, m, ENOBUFS);
 7035                                 }
 7036                                 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
 7037                         }
 7038                 }
 7039         }
 7040         SAHTREE_UNLOCK();
 7041 
 7042         m_freem(m);
 7043         return 0;
 7044 }
 7045 
 7046 /*
 7047  * SADB_X_PROMISC processing
 7048  *
 7049  * m will always be freed.
 7050  */
 7051 static int
 7052 key_promisc(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
 7053 {
 7054         int olen;
 7055 
 7056         IPSEC_ASSERT(so != NULL, ("null socket"));
 7057         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 7058         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 7059         IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
 7060 
 7061         olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
 7062 
 7063         if (olen < sizeof(struct sadb_msg)) {
 7064 #if 1
 7065                 return key_senderror(so, m, EINVAL);
 7066 #else
 7067                 m_freem(m);
 7068                 return 0;
 7069 #endif
 7070         } else if (olen == sizeof(struct sadb_msg)) {
 7071                 /* enable/disable promisc mode */
 7072                 struct keycb *kp;
 7073 
 7074                 if ((kp = (struct keycb *)sotorawcb(so)) == NULL)
 7075                         return key_senderror(so, m, EINVAL);
 7076                 mhp->msg->sadb_msg_errno = 0;
 7077                 switch (mhp->msg->sadb_msg_satype) {
 7078                 case 0:
 7079                 case 1:
 7080                         kp->kp_promisc = mhp->msg->sadb_msg_satype;
 7081                         break;
 7082                 default:
 7083                         return key_senderror(so, m, EINVAL);
 7084                 }
 7085 
 7086                 /* send the original message back to everyone */
 7087                 mhp->msg->sadb_msg_errno = 0;
 7088                 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
 7089         } else {
 7090                 /* send packet as is */
 7091 
 7092                 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg)));
 7093 
 7094                 /* TODO: if sadb_msg_seq is specified, send to specific pid */
 7095                 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
 7096         }
 7097 }
 7098 
 7099 static int (*key_typesw[])(struct socket *, struct mbuf *,
 7100                 const struct sadb_msghdr *) = {
 7101         NULL,           /* SADB_RESERVED */
 7102         key_getspi,     /* SADB_GETSPI */
 7103         key_update,     /* SADB_UPDATE */
 7104         key_add,        /* SADB_ADD */
 7105         key_delete,     /* SADB_DELETE */
 7106         key_get,        /* SADB_GET */
 7107         key_acquire2,   /* SADB_ACQUIRE */
 7108         key_register,   /* SADB_REGISTER */
 7109         NULL,           /* SADB_EXPIRE */
 7110         key_flush,      /* SADB_FLUSH */
 7111         key_dump,       /* SADB_DUMP */
 7112         key_promisc,    /* SADB_X_PROMISC */
 7113         NULL,           /* SADB_X_PCHANGE */
 7114         key_spdadd,     /* SADB_X_SPDUPDATE */
 7115         key_spdadd,     /* SADB_X_SPDADD */
 7116         key_spddelete,  /* SADB_X_SPDDELETE */
 7117         key_spdget,     /* SADB_X_SPDGET */
 7118         NULL,           /* SADB_X_SPDACQUIRE */
 7119         key_spddump,    /* SADB_X_SPDDUMP */
 7120         key_spdflush,   /* SADB_X_SPDFLUSH */
 7121         key_spdadd,     /* SADB_X_SPDSETIDX */
 7122         NULL,           /* SADB_X_SPDEXPIRE */
 7123         key_spddelete2, /* SADB_X_SPDDELETE2 */
 7124 };
 7125 
 7126 /*
 7127  * parse sadb_msg buffer to process PFKEYv2,
 7128  * and create a data to response if needed.
 7129  * I think to be dealed with mbuf directly.
 7130  * IN:
 7131  *     msgp  : pointer to pointer to a received buffer pulluped.
 7132  *             This is rewrited to response.
 7133  *     so    : pointer to socket.
 7134  * OUT:
 7135  *    length for buffer to send to user process.
 7136  */
 7137 int
 7138 key_parse(struct mbuf *m, struct socket *so)
 7139 {
 7140         struct sadb_msg *msg;
 7141         struct sadb_msghdr mh;
 7142         u_int orglen;
 7143         int error;
 7144         int target;
 7145 
 7146         IPSEC_ASSERT(so != NULL, ("null socket"));
 7147         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 7148 
 7149 #if 0   /*kdebug_sadb assumes msg in linear buffer*/
 7150         KEYDEBUG(KEYDEBUG_KEY_DUMP,
 7151                 ipseclog((LOG_DEBUG, "%s: passed sadb_msg\n", __func__));
 7152                 kdebug_sadb(msg));
 7153 #endif
 7154 
 7155         if (m->m_len < sizeof(struct sadb_msg)) {
 7156                 m = m_pullup(m, sizeof(struct sadb_msg));
 7157                 if (!m)
 7158                         return ENOBUFS;
 7159         }
 7160         msg = mtod(m, struct sadb_msg *);
 7161         orglen = PFKEY_UNUNIT64(msg->sadb_msg_len);
 7162         target = KEY_SENDUP_ONE;
 7163 
 7164         if ((m->m_flags & M_PKTHDR) == 0 ||
 7165             m->m_pkthdr.len != m->m_pkthdr.len) {
 7166                 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__));
 7167                 PFKEYSTAT_INC(out_invlen);
 7168                 error = EINVAL;
 7169                 goto senderror;
 7170         }
 7171 
 7172         if (msg->sadb_msg_version != PF_KEY_V2) {
 7173                 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n",
 7174                     __func__, msg->sadb_msg_version));
 7175                 PFKEYSTAT_INC(out_invver);
 7176                 error = EINVAL;
 7177                 goto senderror;
 7178         }
 7179 
 7180         if (msg->sadb_msg_type > SADB_MAX) {
 7181                 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n",
 7182                     __func__, msg->sadb_msg_type));
 7183                 PFKEYSTAT_INC(out_invmsgtype);
 7184                 error = EINVAL;
 7185                 goto senderror;
 7186         }
 7187 
 7188         /* for old-fashioned code - should be nuked */
 7189         if (m->m_pkthdr.len > MCLBYTES) {
 7190                 m_freem(m);
 7191                 return ENOBUFS;
 7192         }
 7193         if (m->m_next) {
 7194                 struct mbuf *n;
 7195 
 7196                 MGETHDR(n, M_NOWAIT, MT_DATA);
 7197                 if (n && m->m_pkthdr.len > MHLEN) {
 7198                         if (!(MCLGET(n, M_NOWAIT))) {
 7199                                 m_free(n);
 7200                                 n = NULL;
 7201                         }
 7202                 }
 7203                 if (!n) {
 7204                         m_freem(m);
 7205                         return ENOBUFS;
 7206                 }
 7207                 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
 7208                 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len;
 7209                 n->m_next = NULL;
 7210                 m_freem(m);
 7211                 m = n;
 7212         }
 7213 
 7214         /* align the mbuf chain so that extensions are in contiguous region. */
 7215         error = key_align(m, &mh);
 7216         if (error)
 7217                 return error;
 7218 
 7219         msg = mh.msg;
 7220 
 7221         /* check SA type */
 7222         switch (msg->sadb_msg_satype) {
 7223         case SADB_SATYPE_UNSPEC:
 7224                 switch (msg->sadb_msg_type) {
 7225                 case SADB_GETSPI:
 7226                 case SADB_UPDATE:
 7227                 case SADB_ADD:
 7228                 case SADB_DELETE:
 7229                 case SADB_GET:
 7230                 case SADB_ACQUIRE:
 7231                 case SADB_EXPIRE:
 7232                         ipseclog((LOG_DEBUG, "%s: must specify satype "
 7233                             "when msg type=%u.\n", __func__,
 7234                             msg->sadb_msg_type));
 7235                         PFKEYSTAT_INC(out_invsatype);
 7236                         error = EINVAL;
 7237                         goto senderror;
 7238                 }
 7239                 break;
 7240         case SADB_SATYPE_AH:
 7241         case SADB_SATYPE_ESP:
 7242         case SADB_X_SATYPE_IPCOMP:
 7243         case SADB_X_SATYPE_TCPSIGNATURE:
 7244                 switch (msg->sadb_msg_type) {
 7245                 case SADB_X_SPDADD:
 7246                 case SADB_X_SPDDELETE:
 7247                 case SADB_X_SPDGET:
 7248                 case SADB_X_SPDDUMP:
 7249                 case SADB_X_SPDFLUSH:
 7250                 case SADB_X_SPDSETIDX:
 7251                 case SADB_X_SPDUPDATE:
 7252                 case SADB_X_SPDDELETE2:
 7253                         ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n",
 7254                                 __func__, msg->sadb_msg_type));
 7255                         PFKEYSTAT_INC(out_invsatype);
 7256                         error = EINVAL;
 7257                         goto senderror;
 7258                 }
 7259                 break;
 7260         case SADB_SATYPE_RSVP:
 7261         case SADB_SATYPE_OSPFV2:
 7262         case SADB_SATYPE_RIPV2:
 7263         case SADB_SATYPE_MIP:
 7264                 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n",
 7265                         __func__, msg->sadb_msg_satype));
 7266                 PFKEYSTAT_INC(out_invsatype);
 7267                 error = EOPNOTSUPP;
 7268                 goto senderror;
 7269         case 1: /* XXX: What does it do? */
 7270                 if (msg->sadb_msg_type == SADB_X_PROMISC)
 7271                         break;
 7272                 /*FALLTHROUGH*/
 7273         default:
 7274                 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n",
 7275                         __func__, msg->sadb_msg_satype));
 7276                 PFKEYSTAT_INC(out_invsatype);
 7277                 error = EINVAL;
 7278                 goto senderror;
 7279         }
 7280 
 7281         /* check field of upper layer protocol and address family */
 7282         if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL
 7283          && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) {
 7284                 struct sadb_address *src0, *dst0;
 7285                 u_int plen;
 7286 
 7287                 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]);
 7288                 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]);
 7289 
 7290                 /* check upper layer protocol */
 7291                 if (src0->sadb_address_proto != dst0->sadb_address_proto) {
 7292                         ipseclog((LOG_DEBUG, "%s: upper layer protocol "
 7293                                 "mismatched.\n", __func__));
 7294                         PFKEYSTAT_INC(out_invaddr);
 7295                         error = EINVAL;
 7296                         goto senderror;
 7297                 }
 7298 
 7299                 /* check family */
 7300                 if (PFKEY_ADDR_SADDR(src0)->sa_family !=
 7301                     PFKEY_ADDR_SADDR(dst0)->sa_family) {
 7302                         ipseclog((LOG_DEBUG, "%s: address family mismatched.\n",
 7303                                 __func__));
 7304                         PFKEYSTAT_INC(out_invaddr);
 7305                         error = EINVAL;
 7306                         goto senderror;
 7307                 }
 7308                 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
 7309                     PFKEY_ADDR_SADDR(dst0)->sa_len) {
 7310                         ipseclog((LOG_DEBUG, "%s: address struct size "
 7311                                 "mismatched.\n", __func__));
 7312                         PFKEYSTAT_INC(out_invaddr);
 7313                         error = EINVAL;
 7314                         goto senderror;
 7315                 }
 7316 
 7317                 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
 7318                 case AF_INET:
 7319                         if (PFKEY_ADDR_SADDR(src0)->sa_len !=
 7320                             sizeof(struct sockaddr_in)) {
 7321                                 PFKEYSTAT_INC(out_invaddr);
 7322                                 error = EINVAL;
 7323                                 goto senderror;
 7324                         }
 7325                         break;
 7326                 case AF_INET6:
 7327                         if (PFKEY_ADDR_SADDR(src0)->sa_len !=
 7328                             sizeof(struct sockaddr_in6)) {
 7329                                 PFKEYSTAT_INC(out_invaddr);
 7330                                 error = EINVAL;
 7331                                 goto senderror;
 7332                         }
 7333                         break;
 7334                 default:
 7335                         ipseclog((LOG_DEBUG, "%s: unsupported address family\n",
 7336                                 __func__));
 7337                         PFKEYSTAT_INC(out_invaddr);
 7338                         error = EAFNOSUPPORT;
 7339                         goto senderror;
 7340                 }
 7341 
 7342                 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
 7343                 case AF_INET:
 7344                         plen = sizeof(struct in_addr) << 3;
 7345                         break;
 7346                 case AF_INET6:
 7347                         plen = sizeof(struct in6_addr) << 3;
 7348                         break;
 7349                 default:
 7350                         plen = 0;       /*fool gcc*/
 7351                         break;
 7352                 }
 7353 
 7354                 /* check max prefix length */
 7355                 if (src0->sadb_address_prefixlen > plen ||
 7356                     dst0->sadb_address_prefixlen > plen) {
 7357                         ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n",
 7358                                 __func__));
 7359                         PFKEYSTAT_INC(out_invaddr);
 7360                         error = EINVAL;
 7361                         goto senderror;
 7362                 }
 7363 
 7364                 /*
 7365                  * prefixlen == 0 is valid because there can be a case when
 7366                  * all addresses are matched.
 7367                  */
 7368         }
 7369 
 7370         if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) ||
 7371             key_typesw[msg->sadb_msg_type] == NULL) {
 7372                 PFKEYSTAT_INC(out_invmsgtype);
 7373                 error = EINVAL;
 7374                 goto senderror;
 7375         }
 7376 
 7377         return (*key_typesw[msg->sadb_msg_type])(so, m, &mh);
 7378 
 7379 senderror:
 7380         msg->sadb_msg_errno = error;
 7381         return key_sendup_mbuf(so, m, target);
 7382 }
 7383 
 7384 static int
 7385 key_senderror(struct socket *so, struct mbuf *m, int code)
 7386 {
 7387         struct sadb_msg *msg;
 7388 
 7389         IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg),
 7390                 ("mbuf too small, len %u", m->m_len));
 7391 
 7392         msg = mtod(m, struct sadb_msg *);
 7393         msg->sadb_msg_errno = code;
 7394         return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
 7395 }
 7396 
 7397 /*
 7398  * set the pointer to each header into message buffer.
 7399  * m will be freed on error.
 7400  * XXX larger-than-MCLBYTES extension?
 7401  */
 7402 static int
 7403 key_align(struct mbuf *m, struct sadb_msghdr *mhp)
 7404 {
 7405         struct mbuf *n;
 7406         struct sadb_ext *ext;
 7407         size_t off, end;
 7408         int extlen;
 7409         int toff;
 7410 
 7411         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 7412         IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
 7413         IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg),
 7414                 ("mbuf too small, len %u", m->m_len));
 7415 
 7416         /* initialize */
 7417         bzero(mhp, sizeof(*mhp));
 7418 
 7419         mhp->msg = mtod(m, struct sadb_msg *);
 7420         mhp->ext[0] = (struct sadb_ext *)mhp->msg;      /*XXX backward compat */
 7421 
 7422         end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
 7423         extlen = end;   /*just in case extlen is not updated*/
 7424         for (off = sizeof(struct sadb_msg); off < end; off += extlen) {
 7425                 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff);
 7426                 if (!n) {
 7427                         /* m is already freed */
 7428                         return ENOBUFS;
 7429                 }
 7430                 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
 7431 
 7432                 /* set pointer */
 7433                 switch (ext->sadb_ext_type) {
 7434                 case SADB_EXT_SA:
 7435                 case SADB_EXT_ADDRESS_SRC:
 7436                 case SADB_EXT_ADDRESS_DST:
 7437                 case SADB_EXT_ADDRESS_PROXY:
 7438                 case SADB_EXT_LIFETIME_CURRENT:
 7439                 case SADB_EXT_LIFETIME_HARD:
 7440                 case SADB_EXT_LIFETIME_SOFT:
 7441                 case SADB_EXT_KEY_AUTH:
 7442                 case SADB_EXT_KEY_ENCRYPT:
 7443                 case SADB_EXT_IDENTITY_SRC:
 7444                 case SADB_EXT_IDENTITY_DST:
 7445                 case SADB_EXT_SENSITIVITY:
 7446                 case SADB_EXT_PROPOSAL:
 7447                 case SADB_EXT_SUPPORTED_AUTH:
 7448                 case SADB_EXT_SUPPORTED_ENCRYPT:
 7449                 case SADB_EXT_SPIRANGE:
 7450                 case SADB_X_EXT_POLICY:
 7451                 case SADB_X_EXT_SA2:
 7452 #ifdef IPSEC_NAT_T
 7453                 case SADB_X_EXT_NAT_T_TYPE:
 7454                 case SADB_X_EXT_NAT_T_SPORT:
 7455                 case SADB_X_EXT_NAT_T_DPORT:
 7456                 case SADB_X_EXT_NAT_T_OAI:
 7457                 case SADB_X_EXT_NAT_T_OAR:
 7458                 case SADB_X_EXT_NAT_T_FRAG:
 7459 #endif
 7460                         /* duplicate check */
 7461                         /*
 7462                          * XXX Are there duplication payloads of either
 7463                          * KEY_AUTH or KEY_ENCRYPT ?
 7464                          */
 7465                         if (mhp->ext[ext->sadb_ext_type] != NULL) {
 7466                                 ipseclog((LOG_DEBUG, "%s: duplicate ext_type "
 7467                                         "%u\n", __func__, ext->sadb_ext_type));
 7468                                 m_freem(m);
 7469                                 PFKEYSTAT_INC(out_dupext);
 7470                                 return EINVAL;
 7471                         }
 7472                         break;
 7473                 default:
 7474                         ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n",
 7475                                 __func__, ext->sadb_ext_type));
 7476                         m_freem(m);
 7477                         PFKEYSTAT_INC(out_invexttype);
 7478                         return EINVAL;
 7479                 }
 7480 
 7481                 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len);
 7482 
 7483                 if (key_validate_ext(ext, extlen)) {
 7484                         m_freem(m);
 7485                         PFKEYSTAT_INC(out_invlen);
 7486                         return EINVAL;
 7487                 }
 7488 
 7489                 n = m_pulldown(m, off, extlen, &toff);
 7490                 if (!n) {
 7491                         /* m is already freed */
 7492                         return ENOBUFS;
 7493                 }
 7494                 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
 7495 
 7496                 mhp->ext[ext->sadb_ext_type] = ext;
 7497                 mhp->extoff[ext->sadb_ext_type] = off;
 7498                 mhp->extlen[ext->sadb_ext_type] = extlen;
 7499         }
 7500 
 7501         if (off != end) {
 7502                 m_freem(m);
 7503                 PFKEYSTAT_INC(out_invlen);
 7504                 return EINVAL;
 7505         }
 7506 
 7507         return 0;
 7508 }
 7509 
 7510 static int
 7511 key_validate_ext(const struct sadb_ext *ext, int len)
 7512 {
 7513         const struct sockaddr *sa;
 7514         enum { NONE, ADDR } checktype = NONE;
 7515         int baselen = 0;
 7516         const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len);
 7517 
 7518         if (len != PFKEY_UNUNIT64(ext->sadb_ext_len))
 7519                 return EINVAL;
 7520 
 7521         /* if it does not match minimum/maximum length, bail */
 7522         if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) ||
 7523             ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0]))
 7524                 return EINVAL;
 7525         if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type])
 7526                 return EINVAL;
 7527         if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type])
 7528                 return EINVAL;
 7529 
 7530         /* more checks based on sadb_ext_type XXX need more */
 7531         switch (ext->sadb_ext_type) {
 7532         case SADB_EXT_ADDRESS_SRC:
 7533         case SADB_EXT_ADDRESS_DST:
 7534         case SADB_EXT_ADDRESS_PROXY:
 7535                 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address));
 7536                 checktype = ADDR;
 7537                 break;
 7538         case SADB_EXT_IDENTITY_SRC:
 7539         case SADB_EXT_IDENTITY_DST:
 7540                 if (((const struct sadb_ident *)ext)->sadb_ident_type ==
 7541                     SADB_X_IDENTTYPE_ADDR) {
 7542                         baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident));
 7543                         checktype = ADDR;
 7544                 } else
 7545                         checktype = NONE;
 7546                 break;
 7547         default:
 7548                 checktype = NONE;
 7549                 break;
 7550         }
 7551 
 7552         switch (checktype) {
 7553         case NONE:
 7554                 break;
 7555         case ADDR:
 7556                 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen);
 7557                 if (len < baselen + sal)
 7558                         return EINVAL;
 7559                 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len)
 7560                         return EINVAL;
 7561                 break;
 7562         }
 7563 
 7564         return 0;
 7565 }
 7566