The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/netipsec/ipsec.c

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /*      $FreeBSD$       */
    2 /*      $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 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  * IPsec controller part.
   35  */
   36 
   37 #include "opt_inet.h"
   38 #include "opt_inet6.h"
   39 #include "opt_ipsec.h"
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/malloc.h>
   44 #include <sys/mbuf.h>
   45 #include <sys/domain.h>
   46 #include <sys/priv.h>
   47 #include <sys/protosw.h>
   48 #include <sys/socket.h>
   49 #include <sys/socketvar.h>
   50 #include <sys/errno.h>
   51 #include <sys/time.h>
   52 #include <sys/kernel.h>
   53 #include <sys/syslog.h>
   54 #include <sys/sysctl.h>
   55 #include <sys/proc.h>
   56 
   57 #include <net/if.h>
   58 #include <net/route.h>
   59 
   60 #include <netinet/in.h>
   61 #include <netinet/in_systm.h>
   62 #include <netinet/ip.h>
   63 #include <netinet/ip_var.h>
   64 #include <netinet/in_var.h>
   65 #include <netinet/udp.h>
   66 #include <netinet/udp_var.h>
   67 #include <netinet/tcp.h>
   68 #include <netinet/udp.h>
   69 
   70 #include <netinet/ip6.h>
   71 #ifdef INET6
   72 #include <netinet6/ip6_var.h>
   73 #endif
   74 #include <netinet/in_pcb.h>
   75 #ifdef INET6
   76 #include <netinet/icmp6.h>
   77 #endif
   78 
   79 #include <sys/types.h>
   80 #include <netipsec/ipsec.h>
   81 #ifdef INET6
   82 #include <netipsec/ipsec6.h>
   83 #endif
   84 #include <netipsec/ah_var.h>
   85 #include <netipsec/esp_var.h>
   86 #include <netipsec/ipcomp.h>            /*XXX*/
   87 #include <netipsec/ipcomp_var.h>
   88 
   89 #include <netipsec/key.h>
   90 #include <netipsec/keydb.h>
   91 #include <netipsec/key_debug.h>
   92 
   93 #include <netipsec/xform.h>
   94 
   95 #include <machine/in_cksum.h>
   96 
   97 #include <opencrypto/cryptodev.h>
   98 
   99 #ifdef IPSEC_DEBUG
  100 int ipsec_debug = 1;
  101 #else
  102 int ipsec_debug = 0;
  103 #endif
  104 
  105 /* NB: name changed so netstat doesn't use it */
  106 struct ipsecstat ipsec4stat;
  107 int ip4_ah_offsetmask = 0;      /* maybe IP_DF? */
  108 int ip4_ipsec_dfbit = 0;        /* DF bit on encap. 0: clear 1: set 2: copy */
  109 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE;
  110 int ip4_esp_net_deflev = IPSEC_LEVEL_USE;
  111 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE;
  112 int ip4_ah_net_deflev = IPSEC_LEVEL_USE;
  113 struct secpolicy ip4_def_policy;
  114 int ip4_ipsec_ecn = 0;          /* ECN ignore(-1)/forbidden(0)/allowed(1) */
  115 int ip4_esp_randpad = -1;
  116 /*
  117  * Crypto support requirements:
  118  *
  119  *  1   require hardware support
  120  * -1   require software support
  121  *  0   take anything
  122  */
  123 int     crypto_support = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE;
  124 
  125 SYSCTL_DECL(_net_inet_ipsec);
  126 
  127 /* net.inet.ipsec */
  128 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY,
  129         def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
  130 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
  131         CTLFLAG_RW, &ip4_esp_trans_deflev,      0, "");
  132 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
  133         CTLFLAG_RW, &ip4_esp_net_deflev,        0, "");
  134 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
  135         CTLFLAG_RW, &ip4_ah_trans_deflev,       0, "");
  136 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
  137         CTLFLAG_RW, &ip4_ah_net_deflev, 0, "");
  138 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS,
  139         ah_cleartos, CTLFLAG_RW,        &ah_cleartos,   0, "");
  140 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK,
  141         ah_offsetmask, CTLFLAG_RW,      &ip4_ah_offsetmask,     0, "");
  142 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT,
  143         dfbit, CTLFLAG_RW,      &ip4_ipsec_dfbit,       0, "");
  144 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN,
  145         ecn, CTLFLAG_RW,        &ip4_ipsec_ecn, 0, "");
  146 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG,
  147         debug, CTLFLAG_RW,      &ipsec_debug,   0, "");
  148 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD,
  149         esp_randpad, CTLFLAG_RW,        &ip4_esp_randpad,       0, "");
  150 SYSCTL_INT(_net_inet_ipsec, OID_AUTO,
  151         crypto_support, CTLFLAG_RW,     &crypto_support,0, "");
  152 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO,
  153         ipsecstats,     CTLFLAG_RD,     &ipsec4stat, ipsecstat, "");
  154 
  155 #ifdef REGRESSION
  156 /*
  157  * When set to 1, IPsec will send packets with the same sequence number.
  158  * This allows to verify if the other side has proper replay attacks detection.
  159  */
  160 int ipsec_replay = 0;
  161 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0,
  162     "Emulate replay attack");
  163 /*
  164  * When set 1, IPsec will send packets with corrupted HMAC.
  165  * This allows to verify if the other side properly detects modified packets.
  166  */
  167 int ipsec_integrity = 0;
  168 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW,
  169     &ipsec_integrity, 0, "Emulate man-in-the-middle attack");
  170 #endif
  171 
  172 #ifdef INET6 
  173 struct ipsecstat ipsec6stat;
  174 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE;
  175 int ip6_esp_net_deflev = IPSEC_LEVEL_USE;
  176 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
  177 int ip6_ah_net_deflev = IPSEC_LEVEL_USE;
  178 int ip6_ipsec_ecn = 0;          /* ECN ignore(-1)/forbidden(0)/allowed(1) */
  179 int ip6_esp_randpad = -1;
  180 
  181 SYSCTL_DECL(_net_inet6_ipsec6);
  182 
  183 /* net.inet6.ipsec6 */
  184 #ifdef COMPAT_KAME
  185 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD,
  186         0,0, compat_ipsecstats_sysctl, "S", "");
  187 #endif /* COMPAT_KAME */
  188 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
  189         def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
  190 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
  191         CTLFLAG_RW, &ip6_esp_trans_deflev,      0, "");
  192 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
  193         CTLFLAG_RW, &ip6_esp_net_deflev,        0, "");
  194 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
  195         CTLFLAG_RW, &ip6_ah_trans_deflev,       0, "");
  196 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
  197         CTLFLAG_RW, &ip6_ah_net_deflev, 0, "");
  198 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
  199         ecn, CTLFLAG_RW,        &ip6_ipsec_ecn, 0, "");
  200 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG,
  201         debug, CTLFLAG_RW,      &ipsec_debug,   0, "");
  202 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD,
  203         esp_randpad, CTLFLAG_RW,        &ip6_esp_randpad,       0, "");
  204 SYSCTL_STRUCT(_net_inet6_ipsec6, IPSECCTL_STATS,
  205         ipsecstats, CTLFLAG_RD, &ipsec6stat, ipsecstat, "");
  206 #endif /* INET6 */
  207 
  208 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb));
  209 #ifdef INET6
  210 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb));
  211 #endif
  212 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int));
  213 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
  214 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
  215 #ifdef INET6
  216 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
  217 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
  218 #endif
  219 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *));
  220 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src));
  221 static int ipsec_set_policy __P((struct secpolicy **pcb_sp,
  222         int optname, caddr_t request, size_t len, struct ucred *cred));
  223 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp));
  224 static void vshiftl __P((unsigned char *, int, int));
  225 static size_t ipsec_hdrsiz __P((struct secpolicy *));
  226 
  227 MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy");
  228 
  229 /*
  230  * Return a held reference to the default SP.
  231  */
  232 static struct secpolicy *
  233 key_allocsp_default(const char* where, int tag)
  234 {
  235         struct secpolicy *sp;
  236 
  237         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
  238                 printf("DP key_allocsp_default from %s:%u\n", where, tag));
  239 
  240         sp = &ip4_def_policy;
  241         if (sp->policy != IPSEC_POLICY_DISCARD &&
  242             sp->policy != IPSEC_POLICY_NONE) {
  243                 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n",
  244                     sp->policy, IPSEC_POLICY_NONE));
  245                 sp->policy = IPSEC_POLICY_NONE;
  246         }
  247         key_addref(sp);
  248 
  249         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
  250                 printf("DP key_allocsp_default returns SP:%p (%u)\n",
  251                         sp, sp->refcnt));
  252         return sp;
  253 }
  254 #define KEY_ALLOCSP_DEFAULT() \
  255         key_allocsp_default(__FILE__, __LINE__)
  256 
  257 /*
  258  * For OUTBOUND packet having a socket. Searching SPD for packet,
  259  * and return a pointer to SP.
  260  * OUT: NULL:   no apropreate SP found, the following value is set to error.
  261  *              0       : bypass
  262  *              EACCES  : discard packet.
  263  *              ENOENT  : ipsec_acquire() in progress, maybe.
  264  *              others  : error occured.
  265  *      others: a pointer to SP
  266  *
  267  * NOTE: IPv6 mapped adddress concern is implemented here.
  268  */
  269 struct secpolicy *
  270 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir)
  271 {
  272         struct secpolicy *sp;
  273 
  274         IPSEC_ASSERT(tdbi != NULL, ("null tdbi"));
  275         IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
  276                 ("invalid direction %u", dir));
  277 
  278         sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir);
  279         if (sp == NULL)                 /*XXX????*/
  280                 sp = KEY_ALLOCSP_DEFAULT();
  281         IPSEC_ASSERT(sp != NULL, ("null SP"));
  282         return sp;
  283 }
  284 
  285 /*
  286  * For OUTBOUND packet having a socket. Searching SPD for packet,
  287  * and return a pointer to SP.
  288  * OUT: NULL:   no apropreate SP found, the following value is set to error.
  289  *              0       : bypass
  290  *              EACCES  : discard packet.
  291  *              ENOENT  : ipsec_acquire() in progress, maybe.
  292  *              others  : error occured.
  293  *      others: a pointer to SP
  294  *
  295  * NOTE: IPv6 mapped adddress concern is implemented here.
  296  */
  297 struct secpolicy *
  298 ipsec_getpolicybysock(m, dir, inp, error)
  299         struct mbuf *m;
  300         u_int dir;
  301         struct inpcb *inp;
  302         int *error;
  303 {
  304         struct inpcbpolicy *pcbsp = NULL;
  305         struct secpolicy *currsp = NULL;        /* policy on socket */
  306         struct secpolicy *sp;
  307 
  308         IPSEC_ASSERT(m != NULL, ("null mbuf"));
  309         IPSEC_ASSERT(inp != NULL, ("null inpcb"));
  310         IPSEC_ASSERT(error != NULL, ("null error"));
  311         IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
  312                 ("invalid direction %u", dir));
  313 
  314         /* set spidx in pcb */
  315         if (inp->inp_vflag & INP_IPV6PROTO) {
  316 #ifdef INET6
  317                 *error = ipsec6_setspidx_in6pcb(m, inp);
  318                 pcbsp = inp->in6p_sp;
  319 #else
  320                 *error = EINVAL;                /* should not happen */
  321 #endif
  322         } else {
  323                 *error = ipsec4_setspidx_inpcb(m, inp);
  324                 pcbsp = inp->inp_sp;
  325         }
  326         if (*error)
  327                 return NULL;
  328 
  329         IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp"));
  330         switch (dir) {
  331         case IPSEC_DIR_INBOUND:
  332                 currsp = pcbsp->sp_in;
  333                 break;
  334         case IPSEC_DIR_OUTBOUND:
  335                 currsp = pcbsp->sp_out;
  336                 break;
  337         }
  338         IPSEC_ASSERT(currsp != NULL, ("null currsp"));
  339 
  340         if (pcbsp->priv) {                      /* when privilieged socket */
  341                 switch (currsp->policy) {
  342                 case IPSEC_POLICY_BYPASS:
  343                 case IPSEC_POLICY_IPSEC:
  344                         key_addref(currsp);
  345                         sp = currsp;
  346                         break;
  347 
  348                 case IPSEC_POLICY_ENTRUST:
  349                         /* look for a policy in SPD */
  350                         sp = KEY_ALLOCSP(&currsp->spidx, dir);
  351                         if (sp == NULL)         /* no SP found */
  352                                 sp = KEY_ALLOCSP_DEFAULT();
  353                         break;
  354 
  355                 default:
  356                         ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n",
  357                                 __func__, currsp->policy));
  358                         *error = EINVAL;
  359                         return NULL;
  360                 }
  361         } else {                                /* unpriv, SPD has policy */
  362                 sp = KEY_ALLOCSP(&currsp->spidx, dir);
  363                 if (sp == NULL) {               /* no SP found */
  364                         switch (currsp->policy) {
  365                         case IPSEC_POLICY_BYPASS:
  366                                 ipseclog((LOG_ERR, "%s: Illegal policy for "
  367                                         "non-priviliged defined %d\n",
  368                                         __func__, currsp->policy));
  369                                 *error = EINVAL;
  370                                 return NULL;
  371 
  372                         case IPSEC_POLICY_ENTRUST:
  373                                 sp = KEY_ALLOCSP_DEFAULT();
  374                                 break;
  375 
  376                         case IPSEC_POLICY_IPSEC:
  377                                 key_addref(currsp);
  378                                 sp = currsp;
  379                                 break;
  380 
  381                         default:
  382                                 ipseclog((LOG_ERR, "%s: Invalid policy for "
  383                                         "PCB %d\n", __func__, currsp->policy));
  384                                 *error = EINVAL;
  385                                 return NULL;
  386                         }
  387                 }
  388         }
  389         IPSEC_ASSERT(sp != NULL,
  390                 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy));
  391         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
  392                 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n",
  393                         __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt));
  394         return sp;
  395 }
  396 
  397 /*
  398  * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
  399  * and return a pointer to SP.
  400  * OUT: positive: a pointer to the entry for security policy leaf matched.
  401  *      NULL:   no apropreate SP found, the following value is set to error.
  402  *              0       : bypass
  403  *              EACCES  : discard packet.
  404  *              ENOENT  : ipsec_acquire() in progress, maybe.
  405  *              others  : error occured.
  406  */
  407 struct secpolicy *
  408 ipsec_getpolicybyaddr(m, dir, flag, error)
  409         struct mbuf *m;
  410         u_int dir;
  411         int flag;
  412         int *error;
  413 {
  414         struct secpolicyindex spidx;
  415         struct secpolicy *sp;
  416 
  417         IPSEC_ASSERT(m != NULL, ("null mbuf"));
  418         IPSEC_ASSERT(error != NULL, ("null error"));
  419         IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
  420                 ("invalid direction %u", dir));
  421 
  422         sp = NULL;
  423         if (key_havesp(dir)) {
  424                 /* Make an index to look for a policy. */
  425                 *error = ipsec_setspidx(m, &spidx,
  426                                         (flag & IP_FORWARDING) ? 0 : 1);
  427                 if (*error != 0) {
  428                         DPRINTF(("%s: setpidx failed, dir %u flag %u\n",
  429                                 __func__, dir, flag));
  430                         return NULL;
  431                 }
  432                 spidx.dir = dir;
  433 
  434                 sp = KEY_ALLOCSP(&spidx, dir);
  435         }
  436         if (sp == NULL)                 /* no SP found, use system default */
  437                 sp = KEY_ALLOCSP_DEFAULT();
  438         IPSEC_ASSERT(sp != NULL, ("null SP"));
  439         return sp;
  440 }
  441 
  442 struct secpolicy *
  443 ipsec4_checkpolicy(m, dir, flag, error, inp)
  444         struct mbuf *m;
  445         u_int dir, flag;
  446         int *error;
  447         struct inpcb *inp;
  448 {
  449         struct secpolicy *sp;
  450 
  451         *error = 0;
  452         if (inp == NULL)
  453                 sp = ipsec_getpolicybyaddr(m, dir, flag, error);
  454         else
  455                 sp = ipsec_getpolicybysock(m, dir, inp, error);
  456         if (sp == NULL) {
  457                 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error"));
  458                 ipsec4stat.ips_out_inval++;
  459                 return NULL;
  460         }
  461         IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error));
  462         switch (sp->policy) {
  463         case IPSEC_POLICY_ENTRUST:
  464         default:
  465                 printf("%s: invalid policy %u\n", __func__, sp->policy);
  466                 /* fall thru... */
  467         case IPSEC_POLICY_DISCARD:
  468                 ipsec4stat.ips_out_polvio++;
  469                 *error = -EINVAL;       /* packet is discarded by caller */
  470                 break;
  471         case IPSEC_POLICY_BYPASS:
  472         case IPSEC_POLICY_NONE:
  473                 KEY_FREESP(&sp);
  474                 sp = NULL;              /* NB: force NULL result */
  475                 break;
  476         case IPSEC_POLICY_IPSEC:
  477                 if (sp->req == NULL)    /* acquire an SA */
  478                         *error = key_spdacquire(sp);
  479                 break;
  480         }
  481         if (*error != 0) {
  482                 KEY_FREESP(&sp);
  483                 sp = NULL;
  484         }
  485         return sp;
  486 }
  487 
  488 static int
  489 ipsec4_setspidx_inpcb(m, pcb)
  490         struct mbuf *m;
  491         struct inpcb *pcb;
  492 {
  493         int error;
  494 
  495         IPSEC_ASSERT(pcb != NULL, ("null pcb"));
  496         IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp"));
  497         IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
  498                 ("null sp_in || sp_out"));
  499 
  500         error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
  501         if (error == 0) {
  502                 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
  503                 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
  504                 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
  505         } else {
  506                 bzero(&pcb->inp_sp->sp_in->spidx,
  507                         sizeof (pcb->inp_sp->sp_in->spidx));
  508                 bzero(&pcb->inp_sp->sp_out->spidx,
  509                         sizeof (pcb->inp_sp->sp_in->spidx));
  510         }
  511         return error;
  512 }
  513 
  514 #ifdef INET6
  515 static int
  516 ipsec6_setspidx_in6pcb(m, pcb)
  517         struct mbuf *m;
  518         struct in6pcb *pcb;
  519 {
  520         struct secpolicyindex *spidx;
  521         int error;
  522 
  523         IPSEC_ASSERT(pcb != NULL, ("null pcb"));
  524         IPSEC_ASSERT(pcb->in6p_sp != NULL, ("null inp_sp"));
  525         IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL,
  526                 ("null sp_in || sp_out"));
  527 
  528         bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
  529         bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
  530 
  531         spidx = &pcb->in6p_sp->sp_in->spidx;
  532         error = ipsec_setspidx(m, spidx, 1);
  533         if (error)
  534                 goto bad;
  535         spidx->dir = IPSEC_DIR_INBOUND;
  536 
  537         spidx = &pcb->in6p_sp->sp_out->spidx;
  538         error = ipsec_setspidx(m, spidx, 1);
  539         if (error)
  540                 goto bad;
  541         spidx->dir = IPSEC_DIR_OUTBOUND;
  542 
  543         return 0;
  544 
  545 bad:
  546         bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
  547         bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
  548         return error;
  549 }
  550 #endif
  551 
  552 /*
  553  * configure security policy index (src/dst/proto/sport/dport)
  554  * by looking at the content of mbuf.
  555  * the caller is responsible for error recovery (like clearing up spidx).
  556  */
  557 static int
  558 ipsec_setspidx(m, spidx, needport)
  559         struct mbuf *m;
  560         struct secpolicyindex *spidx;
  561         int needport;
  562 {
  563         struct ip *ip = NULL;
  564         struct ip ipbuf;
  565         u_int v;
  566         struct mbuf *n;
  567         int len;
  568         int error;
  569 
  570         IPSEC_ASSERT(m != NULL, ("null mbuf"));
  571 
  572         /*
  573          * validate m->m_pkthdr.len.  we see incorrect length if we
  574          * mistakenly call this function with inconsistent mbuf chain
  575          * (like 4.4BSD tcp/udp processing).  XXX should we panic here?
  576          */
  577         len = 0;
  578         for (n = m; n; n = n->m_next)
  579                 len += n->m_len;
  580         if (m->m_pkthdr.len != len) {
  581                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
  582                         printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n",
  583                                 __func__, len, m->m_pkthdr.len));
  584                 return EINVAL;
  585         }
  586 
  587         if (m->m_pkthdr.len < sizeof(struct ip)) {
  588                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
  589                         printf("%s: pkthdr len(%d) too small (v4), ignored.\n",
  590                             __func__, m->m_pkthdr.len));
  591                 return EINVAL;
  592         }
  593 
  594         if (m->m_len >= sizeof(*ip))
  595                 ip = mtod(m, struct ip *);
  596         else {
  597                 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
  598                 ip = &ipbuf;
  599         }
  600 #ifdef _IP_VHL
  601         v = _IP_VHL_V(ip->ip_vhl);
  602 #else
  603         v = ip->ip_v;
  604 #endif
  605         switch (v) {
  606         case 4:
  607                 error = ipsec4_setspidx_ipaddr(m, spidx);
  608                 if (error)
  609                         return error;
  610                 ipsec4_get_ulp(m, spidx, needport);
  611                 return 0;
  612 #ifdef INET6
  613         case 6:
  614                 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
  615                         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
  616                                 printf("%s: pkthdr len(%d) too small (v6), "
  617                                 "ignored\n", __func__, m->m_pkthdr.len));
  618                         return EINVAL;
  619                 }
  620                 error = ipsec6_setspidx_ipaddr(m, spidx);
  621                 if (error)
  622                         return error;
  623                 ipsec6_get_ulp(m, spidx, needport);
  624                 return 0;
  625 #endif
  626         default:
  627                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
  628                         printf("%s: " "unknown IP version %u, ignored.\n",
  629                                 __func__, v));
  630                 return EINVAL;
  631         }
  632 }
  633 
  634 static void
  635 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
  636 {
  637         u_int8_t nxt;
  638         int off;
  639 
  640         /* sanity check */
  641         IPSEC_ASSERT(m != NULL, ("null mbuf"));
  642         IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short"));
  643 
  644         /* NB: ip_input() flips it into host endian XXX need more checking */
  645         if (m->m_len < sizeof (struct ip)) {
  646                 struct ip *ip = mtod(m, struct ip *);
  647                 if (ip->ip_off & (IP_MF | IP_OFFMASK))
  648                         goto done;
  649 #ifdef _IP_VHL
  650                 off = _IP_VHL_HL(ip->ip_vhl) << 2;
  651 #else
  652                 off = ip->ip_hl << 2;
  653 #endif
  654                 nxt = ip->ip_p;
  655         } else {
  656                 struct ip ih;
  657 
  658                 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih);
  659                 if (ih.ip_off & (IP_MF | IP_OFFMASK))
  660                         goto done;
  661 #ifdef _IP_VHL
  662                 off = _IP_VHL_HL(ih.ip_vhl) << 2;
  663 #else
  664                 off = ih.ip_hl << 2;
  665 #endif
  666                 nxt = ih.ip_p;
  667         }
  668 
  669         while (off < m->m_pkthdr.len) {
  670                 struct ip6_ext ip6e;
  671                 struct tcphdr th;
  672                 struct udphdr uh;
  673 
  674                 switch (nxt) {
  675                 case IPPROTO_TCP:
  676                         spidx->ul_proto = nxt;
  677                         if (!needport)
  678                                 goto done_proto;
  679                         if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
  680                                 goto done;
  681                         m_copydata(m, off, sizeof (th), (caddr_t) &th);
  682                         spidx->src.sin.sin_port = th.th_sport;
  683                         spidx->dst.sin.sin_port = th.th_dport;
  684                         return;
  685                 case IPPROTO_UDP:
  686                         spidx->ul_proto = nxt;
  687                         if (!needport)
  688                                 goto done_proto;
  689                         if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
  690                                 goto done;
  691                         m_copydata(m, off, sizeof (uh), (caddr_t) &uh);
  692                         spidx->src.sin.sin_port = uh.uh_sport;
  693                         spidx->dst.sin.sin_port = uh.uh_dport;
  694                         return;
  695                 case IPPROTO_AH:
  696                         if (off + sizeof(ip6e) > m->m_pkthdr.len)
  697                                 goto done;
  698                         /* XXX sigh, this works but is totally bogus */
  699                         m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e);
  700                         off += (ip6e.ip6e_len + 2) << 2;
  701                         nxt = ip6e.ip6e_nxt;
  702                         break;
  703                 case IPPROTO_ICMP:
  704                 default:
  705                         /* XXX intermediate headers??? */
  706                         spidx->ul_proto = nxt;
  707                         goto done_proto;
  708                 }
  709         }
  710 done:
  711         spidx->ul_proto = IPSEC_ULPROTO_ANY;
  712 done_proto:
  713         spidx->src.sin.sin_port = IPSEC_PORT_ANY;
  714         spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
  715 }
  716 
  717 /* assumes that m is sane */
  718 static int
  719 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
  720 {
  721         static const struct sockaddr_in template = {
  722                 sizeof (struct sockaddr_in),
  723                 AF_INET,
  724                 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
  725         };
  726 
  727         spidx->src.sin = template;
  728         spidx->dst.sin = template;
  729 
  730         if (m->m_len < sizeof (struct ip)) {
  731                 m_copydata(m, offsetof(struct ip, ip_src),
  732                            sizeof (struct  in_addr),
  733                            (caddr_t) &spidx->src.sin.sin_addr);
  734                 m_copydata(m, offsetof(struct ip, ip_dst),
  735                            sizeof (struct  in_addr),
  736                            (caddr_t) &spidx->dst.sin.sin_addr);
  737         } else {
  738                 struct ip *ip = mtod(m, struct ip *);
  739                 spidx->src.sin.sin_addr = ip->ip_src;
  740                 spidx->dst.sin.sin_addr = ip->ip_dst;
  741         }
  742 
  743         spidx->prefs = sizeof(struct in_addr) << 3;
  744         spidx->prefd = sizeof(struct in_addr) << 3;
  745 
  746         return 0;
  747 }
  748 
  749 #ifdef INET6
  750 static void
  751 ipsec6_get_ulp(m, spidx, needport)
  752         struct mbuf *m;
  753         struct secpolicyindex *spidx;
  754         int needport;
  755 {
  756         int off, nxt;
  757         struct tcphdr th;
  758         struct udphdr uh;
  759         struct icmp6_hdr ih;
  760 
  761         /* sanity check */
  762         if (m == NULL)
  763                 panic("%s: NULL pointer was passed.\n", __func__);
  764 
  765         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
  766                 printf("%s:\n", __func__); kdebug_mbuf(m));
  767 
  768         /* set default */
  769         spidx->ul_proto = IPSEC_ULPROTO_ANY;
  770         ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
  771         ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
  772 
  773         nxt = -1;
  774         off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
  775         if (off < 0 || m->m_pkthdr.len < off)
  776                 return;
  777 
  778         switch (nxt) {
  779         case IPPROTO_TCP:
  780                 spidx->ul_proto = nxt;
  781                 if (!needport)
  782                         break;
  783                 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
  784                         break;
  785                 m_copydata(m, off, sizeof(th), (caddr_t)&th);
  786                 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
  787                 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
  788                 break;
  789         case IPPROTO_UDP:
  790                 spidx->ul_proto = nxt;
  791                 if (!needport)
  792                         break;
  793                 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
  794                         break;
  795                 m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
  796                 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
  797                 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
  798                 break;
  799         case IPPROTO_ICMPV6:
  800                 spidx->ul_proto = nxt;
  801                 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len)
  802                         break;
  803                 m_copydata(m, off, sizeof(ih), (caddr_t)&ih);
  804                 ((struct sockaddr_in6 *)&spidx->src)->sin6_port =
  805                     htons((uint16_t)ih.icmp6_type);
  806                 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port =
  807                     htons((uint16_t)ih.icmp6_code);
  808                 break;
  809         default:
  810                 /* XXX intermediate headers??? */
  811                 spidx->ul_proto = nxt;
  812                 break;
  813         }
  814 }
  815 
  816 /* assumes that m is sane */
  817 static int
  818 ipsec6_setspidx_ipaddr(m, spidx)
  819         struct mbuf *m;
  820         struct secpolicyindex *spidx;
  821 {
  822         struct ip6_hdr *ip6 = NULL;
  823         struct ip6_hdr ip6buf;
  824         struct sockaddr_in6 *sin6;
  825 
  826         if (m->m_len >= sizeof(*ip6))
  827                 ip6 = mtod(m, struct ip6_hdr *);
  828         else {
  829                 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
  830                 ip6 = &ip6buf;
  831         }
  832 
  833         sin6 = (struct sockaddr_in6 *)&spidx->src;
  834         bzero(sin6, sizeof(*sin6));
  835         sin6->sin6_family = AF_INET6;
  836         sin6->sin6_len = sizeof(struct sockaddr_in6);
  837         bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
  838         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
  839                 sin6->sin6_addr.s6_addr16[1] = 0;
  840                 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
  841         }
  842         spidx->prefs = sizeof(struct in6_addr) << 3;
  843 
  844         sin6 = (struct sockaddr_in6 *)&spidx->dst;
  845         bzero(sin6, sizeof(*sin6));
  846         sin6->sin6_family = AF_INET6;
  847         sin6->sin6_len = sizeof(struct sockaddr_in6);
  848         bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
  849         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
  850                 sin6->sin6_addr.s6_addr16[1] = 0;
  851                 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
  852         }
  853         spidx->prefd = sizeof(struct in6_addr) << 3;
  854 
  855         return 0;
  856 }
  857 #endif
  858 
  859 static void
  860 ipsec_delpcbpolicy(p)
  861         struct inpcbpolicy *p;
  862 {
  863         free(p, M_IPSEC_INPCB);
  864 }
  865 
  866 /* initialize policy in PCB */
  867 int
  868 ipsec_init_policy(so, pcb_sp)
  869         struct socket *so;
  870         struct inpcbpolicy **pcb_sp;
  871 {
  872         struct inpcbpolicy *new;
  873 
  874         /* sanity check. */
  875         if (so == NULL || pcb_sp == NULL)
  876                 panic("%s: NULL pointer was passed.\n", __func__);
  877 
  878         new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy),
  879                                             M_IPSEC_INPCB, M_NOWAIT|M_ZERO);
  880         if (new == NULL) {
  881                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
  882                 return ENOBUFS;
  883         }
  884 
  885         new->priv = IPSEC_IS_PRIVILEGED_SO(so);
  886 
  887         if ((new->sp_in = KEY_NEWSP()) == NULL) {
  888                 ipsec_delpcbpolicy(new);
  889                 return ENOBUFS;
  890         }
  891         new->sp_in->state = IPSEC_SPSTATE_ALIVE;
  892         new->sp_in->policy = IPSEC_POLICY_ENTRUST;
  893 
  894         if ((new->sp_out = KEY_NEWSP()) == NULL) {
  895                 KEY_FREESP(&new->sp_in);
  896                 ipsec_delpcbpolicy(new);
  897                 return ENOBUFS;
  898         }
  899         new->sp_out->state = IPSEC_SPSTATE_ALIVE;
  900         new->sp_out->policy = IPSEC_POLICY_ENTRUST;
  901 
  902         *pcb_sp = new;
  903 
  904         return 0;
  905 }
  906 
  907 /* copy old ipsec policy into new */
  908 int
  909 ipsec_copy_policy(old, new)
  910         struct inpcbpolicy *old, *new;
  911 {
  912         struct secpolicy *sp;
  913 
  914         sp = ipsec_deepcopy_policy(old->sp_in);
  915         if (sp) {
  916                 KEY_FREESP(&new->sp_in);
  917                 new->sp_in = sp;
  918         } else
  919                 return ENOBUFS;
  920 
  921         sp = ipsec_deepcopy_policy(old->sp_out);
  922         if (sp) {
  923                 KEY_FREESP(&new->sp_out);
  924                 new->sp_out = sp;
  925         } else
  926                 return ENOBUFS;
  927 
  928         new->priv = old->priv;
  929 
  930         return 0;
  931 }
  932 
  933 struct ipsecrequest *
  934 ipsec_newisr(void)
  935 {
  936         struct ipsecrequest *p;
  937 
  938         p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO);
  939         if (p != NULL)
  940                 IPSECREQUEST_LOCK_INIT(p);
  941         return p;
  942 }
  943 
  944 void
  945 ipsec_delisr(struct ipsecrequest *p)
  946 {
  947         IPSECREQUEST_LOCK_DESTROY(p);
  948         free(p, M_IPSEC_SR);
  949 }
  950 
  951 /* deep-copy a policy in PCB */
  952 static struct secpolicy *
  953 ipsec_deepcopy_policy(src)
  954         struct secpolicy *src;
  955 {
  956         struct ipsecrequest *newchain = NULL;
  957         struct ipsecrequest *p;
  958         struct ipsecrequest **q;
  959         struct ipsecrequest *r;
  960         struct secpolicy *dst;
  961 
  962         if (src == NULL)
  963                 return NULL;
  964         dst = KEY_NEWSP();
  965         if (dst == NULL)
  966                 return NULL;
  967 
  968         /*
  969          * deep-copy IPsec request chain.  This is required since struct
  970          * ipsecrequest is not reference counted.
  971          */
  972         q = &newchain;
  973         for (p = src->req; p; p = p->next) {
  974                 *q = ipsec_newisr();
  975                 if (*q == NULL)
  976                         goto fail;
  977                 (*q)->saidx.proto = p->saidx.proto;
  978                 (*q)->saidx.mode = p->saidx.mode;
  979                 (*q)->level = p->level;
  980                 (*q)->saidx.reqid = p->saidx.reqid;
  981 
  982                 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
  983                 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
  984 
  985                 (*q)->sp = dst;
  986 
  987                 q = &((*q)->next);
  988         }
  989 
  990         dst->req = newchain;
  991         dst->state = src->state;
  992         dst->policy = src->policy;
  993         /* do not touch the refcnt fields */
  994 
  995         return dst;
  996 
  997 fail:
  998         for (p = newchain; p; p = r) {
  999                 r = p->next;
 1000                 ipsec_delisr(p);
 1001                 p = NULL;
 1002         }
 1003         return NULL;
 1004 }
 1005 
 1006 /* set policy and ipsec request if present. */
 1007 static int
 1008 ipsec_set_policy(pcb_sp, optname, request, len, cred)
 1009         struct secpolicy **pcb_sp;
 1010         int optname;
 1011         caddr_t request;
 1012         size_t len;
 1013         struct ucred *cred;
 1014 {
 1015         struct sadb_x_policy *xpl;
 1016         struct secpolicy *newsp = NULL;
 1017         int error;
 1018 
 1019         /* sanity check. */
 1020         if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
 1021                 return EINVAL;
 1022         if (len < sizeof(*xpl))
 1023                 return EINVAL;
 1024         xpl = (struct sadb_x_policy *)request;
 1025 
 1026         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 1027                 printf("%s: passed policy\n", __func__);
 1028                 kdebug_sadb_x_policy((struct sadb_ext *)xpl));
 1029 
 1030         /* check policy type */
 1031         /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
 1032         if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
 1033          || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
 1034                 return EINVAL;
 1035 
 1036         /* check privileged socket */
 1037         if (cred != NULL && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) {
 1038                 error = priv_check_cred(cred, PRIV_NETINET_IPSEC, 0);
 1039                 if (error)
 1040                         return EACCES;
 1041         }
 1042 
 1043         /* allocation new SP entry */
 1044         if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
 1045                 return error;
 1046 
 1047         newsp->state = IPSEC_SPSTATE_ALIVE;
 1048 
 1049         /* clear old SP and set new SP */
 1050         KEY_FREESP(pcb_sp);
 1051         *pcb_sp = newsp;
 1052         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 1053                 printf("%s: new policy\n", __func__);
 1054                 kdebug_secpolicy(newsp));
 1055 
 1056         return 0;
 1057 }
 1058 
 1059 static int
 1060 ipsec_get_policy(pcb_sp, mp)
 1061         struct secpolicy *pcb_sp;
 1062         struct mbuf **mp;
 1063 {
 1064 
 1065         /* sanity check. */
 1066         if (pcb_sp == NULL || mp == NULL)
 1067                 return EINVAL;
 1068 
 1069         *mp = key_sp2msg(pcb_sp);
 1070         if (!*mp) {
 1071                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
 1072                 return ENOBUFS;
 1073         }
 1074 
 1075         (*mp)->m_type = MT_DATA;
 1076         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 1077                 printf("%s:\n", __func__); kdebug_mbuf(*mp));
 1078 
 1079         return 0;
 1080 }
 1081 
 1082 int
 1083 ipsec4_set_policy(inp, optname, request, len, cred)
 1084         struct inpcb *inp;
 1085         int optname;
 1086         caddr_t request;
 1087         size_t len;
 1088         struct ucred *cred;
 1089 {
 1090         struct sadb_x_policy *xpl;
 1091         struct secpolicy **pcb_sp;
 1092 
 1093         /* sanity check. */
 1094         if (inp == NULL || request == NULL)
 1095                 return EINVAL;
 1096         if (len < sizeof(*xpl))
 1097                 return EINVAL;
 1098         xpl = (struct sadb_x_policy *)request;
 1099 
 1100         /* select direction */
 1101         switch (xpl->sadb_x_policy_dir) {
 1102         case IPSEC_DIR_INBOUND:
 1103                 pcb_sp = &inp->inp_sp->sp_in;
 1104                 break;
 1105         case IPSEC_DIR_OUTBOUND:
 1106                 pcb_sp = &inp->inp_sp->sp_out;
 1107                 break;
 1108         default:
 1109                 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
 1110                         xpl->sadb_x_policy_dir));
 1111                 return EINVAL;
 1112         }
 1113 
 1114         return ipsec_set_policy(pcb_sp, optname, request, len, cred);
 1115 }
 1116 
 1117 int
 1118 ipsec4_get_policy(inp, request, len, mp)
 1119         struct inpcb *inp;
 1120         caddr_t request;
 1121         size_t len;
 1122         struct mbuf **mp;
 1123 {
 1124         struct sadb_x_policy *xpl;
 1125         struct secpolicy *pcb_sp;
 1126 
 1127         /* sanity check. */
 1128         if (inp == NULL || request == NULL || mp == NULL)
 1129                 return EINVAL;
 1130         IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp"));
 1131         if (len < sizeof(*xpl))
 1132                 return EINVAL;
 1133         xpl = (struct sadb_x_policy *)request;
 1134 
 1135         /* select direction */
 1136         switch (xpl->sadb_x_policy_dir) {
 1137         case IPSEC_DIR_INBOUND:
 1138                 pcb_sp = inp->inp_sp->sp_in;
 1139                 break;
 1140         case IPSEC_DIR_OUTBOUND:
 1141                 pcb_sp = inp->inp_sp->sp_out;
 1142                 break;
 1143         default:
 1144                 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
 1145                         xpl->sadb_x_policy_dir));
 1146                 return EINVAL;
 1147         }
 1148 
 1149         return ipsec_get_policy(pcb_sp, mp);
 1150 }
 1151 
 1152 /* delete policy in PCB */
 1153 int
 1154 ipsec4_delete_pcbpolicy(inp)
 1155         struct inpcb *inp;
 1156 {
 1157         IPSEC_ASSERT(inp != NULL, ("null inp"));
 1158 
 1159         if (inp->inp_sp == NULL)
 1160                 return 0;
 1161 
 1162         if (inp->inp_sp->sp_in != NULL)
 1163                 KEY_FREESP(&inp->inp_sp->sp_in);
 1164 
 1165         if (inp->inp_sp->sp_out != NULL)
 1166                 KEY_FREESP(&inp->inp_sp->sp_out);
 1167 
 1168         ipsec_delpcbpolicy(inp->inp_sp);
 1169         inp->inp_sp = NULL;
 1170 
 1171         return 0;
 1172 }
 1173 
 1174 #ifdef INET6
 1175 int
 1176 ipsec6_set_policy(in6p, optname, request, len, cred)
 1177         struct in6pcb *in6p;
 1178         int optname;
 1179         caddr_t request;
 1180         size_t len;
 1181         struct ucred *cred;
 1182 {
 1183         struct sadb_x_policy *xpl;
 1184         struct secpolicy **pcb_sp;
 1185 
 1186         /* sanity check. */
 1187         if (in6p == NULL || request == NULL)
 1188                 return EINVAL;
 1189         if (len < sizeof(*xpl))
 1190                 return EINVAL;
 1191         xpl = (struct sadb_x_policy *)request;
 1192 
 1193         /* select direction */
 1194         switch (xpl->sadb_x_policy_dir) {
 1195         case IPSEC_DIR_INBOUND:
 1196                 pcb_sp = &in6p->in6p_sp->sp_in;
 1197                 break;
 1198         case IPSEC_DIR_OUTBOUND:
 1199                 pcb_sp = &in6p->in6p_sp->sp_out;
 1200                 break;
 1201         default:
 1202                 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
 1203                         xpl->sadb_x_policy_dir));
 1204                 return EINVAL;
 1205         }
 1206 
 1207         return ipsec_set_policy(pcb_sp, optname, request, len, cred);
 1208 }
 1209 
 1210 int
 1211 ipsec6_get_policy(in6p, request, len, mp)
 1212         struct in6pcb *in6p;
 1213         caddr_t request;
 1214         size_t len;
 1215         struct mbuf **mp;
 1216 {
 1217         struct sadb_x_policy *xpl;
 1218         struct secpolicy *pcb_sp;
 1219 
 1220         /* sanity check. */
 1221         if (in6p == NULL || request == NULL || mp == NULL)
 1222                 return EINVAL;
 1223         IPSEC_ASSERT(in6p->in6p_sp != NULL, ("null in6p_sp"));
 1224         if (len < sizeof(*xpl))
 1225                 return EINVAL;
 1226         xpl = (struct sadb_x_policy *)request;
 1227 
 1228         /* select direction */
 1229         switch (xpl->sadb_x_policy_dir) {
 1230         case IPSEC_DIR_INBOUND:
 1231                 pcb_sp = in6p->in6p_sp->sp_in;
 1232                 break;
 1233         case IPSEC_DIR_OUTBOUND:
 1234                 pcb_sp = in6p->in6p_sp->sp_out;
 1235                 break;
 1236         default:
 1237                 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
 1238                         xpl->sadb_x_policy_dir));
 1239                 return EINVAL;
 1240         }
 1241 
 1242         return ipsec_get_policy(pcb_sp, mp);
 1243 }
 1244 
 1245 int
 1246 ipsec6_delete_pcbpolicy(in6p)
 1247         struct in6pcb *in6p;
 1248 {
 1249         IPSEC_ASSERT(in6p != NULL, ("null in6p"));
 1250 
 1251         if (in6p->in6p_sp == NULL)
 1252                 return 0;
 1253 
 1254         if (in6p->in6p_sp->sp_in != NULL)
 1255                 KEY_FREESP(&in6p->in6p_sp->sp_in);
 1256 
 1257         if (in6p->in6p_sp->sp_out != NULL)
 1258                 KEY_FREESP(&in6p->in6p_sp->sp_out);
 1259 
 1260         ipsec_delpcbpolicy(in6p->in6p_sp);
 1261         in6p->in6p_sp = NULL;
 1262 
 1263         return 0;
 1264 }
 1265 #endif
 1266 
 1267 /*
 1268  * return current level.
 1269  * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
 1270  */
 1271 u_int
 1272 ipsec_get_reqlevel(isr)
 1273         struct ipsecrequest *isr;
 1274 {
 1275         u_int level = 0;
 1276         u_int esp_trans_deflev, esp_net_deflev;
 1277         u_int ah_trans_deflev, ah_net_deflev;
 1278 
 1279         IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument"));
 1280         IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
 1281                 ("af family mismatch, src %u, dst %u",
 1282                  isr->sp->spidx.src.sa.sa_family,
 1283                  isr->sp->spidx.dst.sa.sa_family));
 1284 
 1285 /* XXX note that we have ipseclog() expanded here - code sync issue */
 1286 #define IPSEC_CHECK_DEFAULT(lev) \
 1287         (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE            \
 1288                         && (lev) != IPSEC_LEVEL_UNIQUE)                       \
 1289                 ? (ipsec_debug                                                \
 1290                         ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
 1291                                 (lev), IPSEC_LEVEL_REQUIRE)                   \
 1292                         : 0),                                                 \
 1293                         (lev) = IPSEC_LEVEL_REQUIRE,                          \
 1294                         (lev)                                                 \
 1295                 : (lev))
 1296 
 1297         /* set default level */
 1298         switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
 1299 #ifdef INET
 1300         case AF_INET:
 1301                 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
 1302                 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
 1303                 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
 1304                 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
 1305                 break;
 1306 #endif
 1307 #ifdef INET6
 1308         case AF_INET6:
 1309                 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
 1310                 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
 1311                 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
 1312                 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
 1313                 break;
 1314 #endif /* INET6 */
 1315         default:
 1316                 panic("%s: unknown af %u",
 1317                         __func__, isr->sp->spidx.src.sa.sa_family);
 1318         }
 1319 
 1320 #undef IPSEC_CHECK_DEFAULT
 1321 
 1322         /* set level */
 1323         switch (isr->level) {
 1324         case IPSEC_LEVEL_DEFAULT:
 1325                 switch (isr->saidx.proto) {
 1326                 case IPPROTO_ESP:
 1327                         if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
 1328                                 level = esp_net_deflev;
 1329                         else
 1330                                 level = esp_trans_deflev;
 1331                         break;
 1332                 case IPPROTO_AH:
 1333                         if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
 1334                                 level = ah_net_deflev;
 1335                         else
 1336                                 level = ah_trans_deflev;
 1337                         break;
 1338                 case IPPROTO_IPCOMP:
 1339                         /*
 1340                          * we don't really care, as IPcomp document says that
 1341                          * we shouldn't compress small packets
 1342                          */
 1343                         level = IPSEC_LEVEL_USE;
 1344                         break;
 1345                 default:
 1346                         panic("%s: Illegal protocol defined %u\n", __func__,
 1347                                 isr->saidx.proto);
 1348                 }
 1349                 break;
 1350 
 1351         case IPSEC_LEVEL_USE:
 1352         case IPSEC_LEVEL_REQUIRE:
 1353                 level = isr->level;
 1354                 break;
 1355         case IPSEC_LEVEL_UNIQUE:
 1356                 level = IPSEC_LEVEL_REQUIRE;
 1357                 break;
 1358 
 1359         default:
 1360                 panic("%s: Illegal IPsec level %u\n", __func__, isr->level);
 1361         }
 1362 
 1363         return level;
 1364 }
 1365 
 1366 /*
 1367  * Check security policy requirements against the actual
 1368  * packet contents.  Return one if the packet should be
 1369  * reject as "invalid"; otherwiser return zero to have the
 1370  * packet treated as "valid".
 1371  *
 1372  * OUT:
 1373  *      0: valid
 1374  *      1: invalid
 1375  */
 1376 int
 1377 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
 1378 {
 1379         struct ipsecrequest *isr;
 1380         int need_auth;
 1381 
 1382         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
 1383                 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp));
 1384 
 1385         /* check policy */
 1386         switch (sp->policy) {
 1387         case IPSEC_POLICY_DISCARD:
 1388                 return 1;
 1389         case IPSEC_POLICY_BYPASS:
 1390         case IPSEC_POLICY_NONE:
 1391                 return 0;
 1392         }
 1393 
 1394         IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
 1395                 ("invalid policy %u", sp->policy));
 1396 
 1397         /* XXX should compare policy against ipsec header history */
 1398 
 1399         need_auth = 0;
 1400         for (isr = sp->req; isr != NULL; isr = isr->next) {
 1401                 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
 1402                         continue;
 1403                 switch (isr->saidx.proto) {
 1404                 case IPPROTO_ESP:
 1405                         if ((m->m_flags & M_DECRYPTED) == 0) {
 1406                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 1407                                     printf("%s: ESP m_flags:%x\n", __func__,
 1408                                             m->m_flags));
 1409                                 return 1;
 1410                         }
 1411 
 1412                         if (!need_auth &&
 1413                             isr->sav != NULL &&
 1414                             isr->sav->tdb_authalgxform != NULL &&
 1415                             (m->m_flags & M_AUTHIPDGM) == 0) {
 1416                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 1417                                     printf("%s: ESP/AH m_flags:%x\n", __func__,
 1418                                             m->m_flags));
 1419                                 return 1;
 1420                         }
 1421                         break;
 1422                 case IPPROTO_AH:
 1423                         need_auth = 1;
 1424                         if ((m->m_flags & M_AUTHIPHDR) == 0) {
 1425                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 1426                                     printf("%s: AH m_flags:%x\n", __func__,
 1427                                             m->m_flags));
 1428                                 return 1;
 1429                         }
 1430                         break;
 1431                 case IPPROTO_IPCOMP:
 1432                         /*
 1433                          * we don't really care, as IPcomp document
 1434                          * says that we shouldn't compress small
 1435                          * packets, IPComp policy should always be
 1436                          * treated as being in "use" level.
 1437                          */
 1438                         break;
 1439                 }
 1440         }
 1441         return 0;               /* valid */
 1442 }
 1443 
 1444 /*
 1445  * Check AH/ESP integrity.
 1446  * This function is called from tcp_input(), udp_input(),
 1447  * and {ah,esp}4_input for tunnel mode
 1448  */
 1449 int
 1450 ipsec4_in_reject(m, inp)
 1451         struct mbuf *m;
 1452         struct inpcb *inp;
 1453 {
 1454         struct secpolicy *sp;
 1455         int error;
 1456         int result;
 1457 
 1458         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 1459 
 1460         /* get SP for this packet.
 1461          * When we are called from ip_forward(), we call
 1462          * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
 1463          */
 1464         if (inp == NULL)
 1465                 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
 1466         else
 1467                 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
 1468 
 1469         if (sp != NULL) {
 1470                 result = ipsec_in_reject(sp, m);
 1471                 if (result)
 1472                         ipsec4stat.ips_in_polvio++;
 1473                 KEY_FREESP(&sp);
 1474         } else {
 1475                 result = 0;     /* XXX should be panic ?
 1476                                  * -> No, there may be error. */
 1477         }
 1478         return result;
 1479 }
 1480 
 1481 #ifdef INET6
 1482 /*
 1483  * Check AH/ESP integrity.
 1484  * This function is called from tcp6_input(), udp6_input(),
 1485  * and {ah,esp}6_input for tunnel mode
 1486  */
 1487 int
 1488 ipsec6_in_reject(m, inp)
 1489         struct mbuf *m;
 1490         struct inpcb *inp;
 1491 {
 1492         struct secpolicy *sp = NULL;
 1493         int error;
 1494         int result;
 1495 
 1496         /* sanity check */
 1497         if (m == NULL)
 1498                 return 0;       /* XXX should be panic ? */
 1499 
 1500         /* get SP for this packet.
 1501          * When we are called from ip_forward(), we call
 1502          * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
 1503          */
 1504         if (inp == NULL)
 1505                 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
 1506         else
 1507                 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
 1508 
 1509         if (sp != NULL) {
 1510                 result = ipsec_in_reject(sp, m);
 1511                 if (result)
 1512                         ipsec6stat.ips_in_polvio++;
 1513                 KEY_FREESP(&sp);
 1514         } else {
 1515                 result = 0;
 1516         }
 1517         return result;
 1518 }
 1519 #endif
 1520 
 1521 /*
 1522  * compute the byte size to be occupied by IPsec header.
 1523  * in case it is tunneled, it includes the size of outer IP header.
 1524  * NOTE: SP passed is free in this function.
 1525  */
 1526 static size_t
 1527 ipsec_hdrsiz(struct secpolicy *sp)
 1528 {
 1529         struct ipsecrequest *isr;
 1530         size_t siz;
 1531 
 1532         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
 1533                 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp));
 1534 
 1535         switch (sp->policy) {
 1536         case IPSEC_POLICY_DISCARD:
 1537         case IPSEC_POLICY_BYPASS:
 1538         case IPSEC_POLICY_NONE:
 1539                 return 0;
 1540         }
 1541 
 1542         IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
 1543                 ("invalid policy %u", sp->policy));
 1544 
 1545         siz = 0;
 1546         for (isr = sp->req; isr != NULL; isr = isr->next) {
 1547                 size_t clen = 0;
 1548 
 1549                 switch (isr->saidx.proto) {
 1550                 case IPPROTO_ESP:
 1551                         clen = esp_hdrsiz(isr->sav);
 1552                         break;
 1553                 case IPPROTO_AH:
 1554                         clen = ah_hdrsiz(isr->sav);
 1555                         break;
 1556                 case IPPROTO_IPCOMP:
 1557                         clen = sizeof(struct ipcomp);
 1558                         break;
 1559                 }
 1560 
 1561                 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
 1562                         switch (isr->saidx.dst.sa.sa_family) {
 1563                         case AF_INET:
 1564                                 clen += sizeof(struct ip);
 1565                                 break;
 1566 #ifdef INET6
 1567                         case AF_INET6:
 1568                                 clen += sizeof(struct ip6_hdr);
 1569                                 break;
 1570 #endif
 1571                         default:
 1572                                 ipseclog((LOG_ERR, "%s: unknown AF %d in "
 1573                                     "IPsec tunnel SA\n", __func__,
 1574                                     ((struct sockaddr *)&isr->saidx.dst)->sa_family));
 1575                                 break;
 1576                         }
 1577                 }
 1578                 siz += clen;
 1579         }
 1580 
 1581         return siz;
 1582 }
 1583 
 1584 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
 1585 size_t
 1586 ipsec4_hdrsiz(m, dir, inp)
 1587         struct mbuf *m;
 1588         u_int dir;
 1589         struct inpcb *inp;
 1590 {
 1591         struct secpolicy *sp;
 1592         int error;
 1593         size_t size;
 1594 
 1595         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 1596 
 1597         /* get SP for this packet.
 1598          * When we are called from ip_forward(), we call
 1599          * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
 1600          */
 1601         if (inp == NULL)
 1602                 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
 1603         else
 1604                 sp = ipsec_getpolicybysock(m, dir, inp, &error);
 1605 
 1606         if (sp != NULL) {
 1607                 size = ipsec_hdrsiz(sp);
 1608                 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
 1609                         printf("%s: size:%lu.\n", __func__,
 1610                                 (unsigned long)size));
 1611 
 1612                 KEY_FREESP(&sp);
 1613         } else {
 1614                 size = 0;       /* XXX should be panic ? */
 1615         }
 1616         return size;
 1617 }
 1618 
 1619 #ifdef INET6
 1620 /* This function is called from ipsec6_hdrsize_tcp(),
 1621  * and maybe from ip6_forward.()
 1622  */
 1623 size_t
 1624 ipsec6_hdrsiz(m, dir, in6p)
 1625         struct mbuf *m;
 1626         u_int dir;
 1627         struct in6pcb *in6p;
 1628 {
 1629         struct secpolicy *sp;
 1630         int error;
 1631         size_t size;
 1632 
 1633         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 1634         IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL,
 1635                 ("socket w/o inpcb"));
 1636 
 1637         /* get SP for this packet */
 1638         /* XXX Is it right to call with IP_FORWARDING. */
 1639         if (in6p == NULL)
 1640                 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
 1641         else
 1642                 sp = ipsec_getpolicybysock(m, dir, in6p, &error);
 1643 
 1644         if (sp == NULL)
 1645                 return 0;
 1646         size = ipsec_hdrsiz(sp);
 1647         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
 1648                 printf("%s: size:%lu.\n", __func__, (unsigned long)size));
 1649         KEY_FREESP(&sp);
 1650 
 1651         return size;
 1652 }
 1653 #endif /*INET6*/
 1654 
 1655 /*
 1656  * Check the variable replay window.
 1657  * ipsec_chkreplay() performs replay check before ICV verification.
 1658  * ipsec_updatereplay() updates replay bitmap.  This must be called after
 1659  * ICV verification (it also performs replay check, which is usually done
 1660  * beforehand).
 1661  * 0 (zero) is returned if packet disallowed, 1 if packet permitted.
 1662  *
 1663  * based on RFC 2401.
 1664  */
 1665 int
 1666 ipsec_chkreplay(seq, sav)
 1667         u_int32_t seq;
 1668         struct secasvar *sav;
 1669 {
 1670         const struct secreplay *replay;
 1671         u_int32_t diff;
 1672         int fr;
 1673         u_int32_t wsizeb;       /* constant: bits of window size */
 1674         int frlast;             /* constant: last frame */
 1675 
 1676         IPSEC_SPLASSERT_SOFTNET(__func__);
 1677 
 1678         IPSEC_ASSERT(sav != NULL, ("Null SA"));
 1679         IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
 1680 
 1681         replay = sav->replay;
 1682 
 1683         if (replay->wsize == 0)
 1684                 return 1;       /* no need to check replay. */
 1685 
 1686         /* constant */
 1687         frlast = replay->wsize - 1;
 1688         wsizeb = replay->wsize << 3;
 1689 
 1690         /* sequence number of 0 is invalid */
 1691         if (seq == 0)
 1692                 return 0;
 1693 
 1694         /* first time is always okay */
 1695         if (replay->count == 0)
 1696                 return 1;
 1697 
 1698         if (seq > replay->lastseq) {
 1699                 /* larger sequences are okay */
 1700                 return 1;
 1701         } else {
 1702                 /* seq is equal or less than lastseq. */
 1703                 diff = replay->lastseq - seq;
 1704 
 1705                 /* over range to check, i.e. too old or wrapped */
 1706                 if (diff >= wsizeb)
 1707                         return 0;
 1708 
 1709                 fr = frlast - diff / 8;
 1710 
 1711                 /* this packet already seen ? */
 1712                 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
 1713                         return 0;
 1714 
 1715                 /* out of order but good */
 1716                 return 1;
 1717         }
 1718 }
 1719 
 1720 /*
 1721  * check replay counter whether to update or not.
 1722  * OUT: 0:      OK
 1723  *      1:      NG
 1724  */
 1725 int
 1726 ipsec_updatereplay(seq, sav)
 1727         u_int32_t seq;
 1728         struct secasvar *sav;
 1729 {
 1730         struct secreplay *replay;
 1731         u_int32_t diff;
 1732         int fr;
 1733         u_int32_t wsizeb;       /* constant: bits of window size */
 1734         int frlast;             /* constant: last frame */
 1735 
 1736         IPSEC_SPLASSERT_SOFTNET(__func__);
 1737 
 1738         IPSEC_ASSERT(sav != NULL, ("Null SA"));
 1739         IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
 1740 
 1741         replay = sav->replay;
 1742 
 1743         if (replay->wsize == 0)
 1744                 goto ok;        /* no need to check replay. */
 1745 
 1746         /* constant */
 1747         frlast = replay->wsize - 1;
 1748         wsizeb = replay->wsize << 3;
 1749 
 1750         /* sequence number of 0 is invalid */
 1751         if (seq == 0)
 1752                 return 1;
 1753 
 1754         /* first time */
 1755         if (replay->count == 0) {
 1756                 replay->lastseq = seq;
 1757                 bzero(replay->bitmap, replay->wsize);
 1758                 (replay->bitmap)[frlast] = 1;
 1759                 goto ok;
 1760         }
 1761 
 1762         if (seq > replay->lastseq) {
 1763                 /* seq is larger than lastseq. */
 1764                 diff = seq - replay->lastseq;
 1765 
 1766                 /* new larger sequence number */
 1767                 if (diff < wsizeb) {
 1768                         /* In window */
 1769                         /* set bit for this packet */
 1770                         vshiftl(replay->bitmap, diff, replay->wsize);
 1771                         (replay->bitmap)[frlast] |= 1;
 1772                 } else {
 1773                         /* this packet has a "way larger" */
 1774                         bzero(replay->bitmap, replay->wsize);
 1775                         (replay->bitmap)[frlast] = 1;
 1776                 }
 1777                 replay->lastseq = seq;
 1778 
 1779                 /* larger is good */
 1780         } else {
 1781                 /* seq is equal or less than lastseq. */
 1782                 diff = replay->lastseq - seq;
 1783 
 1784                 /* over range to check, i.e. too old or wrapped */
 1785                 if (diff >= wsizeb)
 1786                         return 1;
 1787 
 1788                 fr = frlast - diff / 8;
 1789 
 1790                 /* this packet already seen ? */
 1791                 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
 1792                         return 1;
 1793 
 1794                 /* mark as seen */
 1795                 (replay->bitmap)[fr] |= (1 << (diff % 8));
 1796 
 1797                 /* out of order but good */
 1798         }
 1799 
 1800 ok:
 1801         if (replay->count == ~0) {
 1802 
 1803                 /* set overflow flag */
 1804                 replay->overflow++;
 1805 
 1806                 /* don't increment, no more packets accepted */
 1807                 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
 1808                         return 1;
 1809 
 1810                 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n",
 1811                     __func__, replay->overflow, ipsec_logsastr(sav)));
 1812         }
 1813 
 1814         replay->count++;
 1815 
 1816         return 0;
 1817 }
 1818 
 1819 /*
 1820  * shift variable length buffer to left.
 1821  * IN:  bitmap: pointer to the buffer
 1822  *      nbit:   the number of to shift.
 1823  *      wsize:  buffer size (bytes).
 1824  */
 1825 static void
 1826 vshiftl(bitmap, nbit, wsize)
 1827         unsigned char *bitmap;
 1828         int nbit, wsize;
 1829 {
 1830         int s, j, i;
 1831         unsigned char over;
 1832 
 1833         for (j = 0; j < nbit; j += 8) {
 1834                 s = (nbit - j < 8) ? (nbit - j): 8;
 1835                 bitmap[0] <<= s;
 1836                 for (i = 1; i < wsize; i++) {
 1837                         over = (bitmap[i] >> (8 - s));
 1838                         bitmap[i] <<= s;
 1839                         bitmap[i-1] |= over;
 1840                 }
 1841         }
 1842 
 1843         return;
 1844 }
 1845 
 1846 /* Return a printable string for the IPv4 address. */
 1847 static char *
 1848 inet_ntoa4(struct in_addr ina)
 1849 {
 1850         static char buf[4][4 * sizeof "123" + 4];
 1851         unsigned char *ucp = (unsigned char *) &ina;
 1852         static int i = 3;
 1853 
 1854         /* XXX-BZ returns static buffer. */
 1855         i = (i + 1) % 4;
 1856         sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff,
 1857             ucp[2] & 0xff, ucp[3] & 0xff);
 1858         return (buf[i]);
 1859 }
 1860 
 1861 /* Return a printable string for the address. */
 1862 char *
 1863 ipsec_address(union sockaddr_union* sa)
 1864 {
 1865 #ifdef INET6
 1866         char ip6buf[INET6_ADDRSTRLEN];
 1867 #endif
 1868         switch (sa->sa.sa_family) {
 1869 #ifdef INET
 1870         case AF_INET:
 1871                 return inet_ntoa4(sa->sin.sin_addr);
 1872 #endif /* INET */
 1873 
 1874 #ifdef INET6
 1875         case AF_INET6:
 1876                 return ip6_sprintf(ip6buf, &sa->sin6.sin6_addr);
 1877 #endif /* INET6 */
 1878 
 1879         default:
 1880                 return "(unknown address family)";
 1881         }
 1882 }
 1883 
 1884 const char *
 1885 ipsec_logsastr(sav)
 1886         struct secasvar *sav;
 1887 {
 1888         static char buf[256];
 1889         char *p;
 1890         struct secasindex *saidx = &sav->sah->saidx;
 1891 
 1892         IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
 1893                 ("address family mismatch"));
 1894 
 1895         p = buf;
 1896         snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
 1897         while (p && *p)
 1898                 p++;
 1899         /* NB: only use ipsec_address on one address at a time */
 1900         snprintf(p, sizeof (buf) - (p - buf), "src=%s ",
 1901                 ipsec_address(&saidx->src));
 1902         while (p && *p)
 1903                 p++;
 1904         snprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
 1905                 ipsec_address(&saidx->dst));
 1906 
 1907         return buf;
 1908 }
 1909 
 1910 void
 1911 ipsec_dumpmbuf(m)
 1912         struct mbuf *m;
 1913 {
 1914         int totlen;
 1915         int i;
 1916         u_char *p;
 1917 
 1918         totlen = 0;
 1919         printf("---\n");
 1920         while (m) {
 1921                 p = mtod(m, u_char *);
 1922                 for (i = 0; i < m->m_len; i++) {
 1923                         printf("%02x ", p[i]);
 1924                         totlen++;
 1925                         if (totlen % 16 == 0)
 1926                                 printf("\n");
 1927                 }
 1928                 m = m->m_next;
 1929         }
 1930         if (totlen % 16 != 0)
 1931                 printf("\n");
 1932         printf("---\n");
 1933 }
 1934 
 1935 static void
 1936 ipsec_attach(void)
 1937 {
 1938         SECPOLICY_LOCK_INIT(&ip4_def_policy);
 1939         ip4_def_policy.refcnt = 1;                      /* NB: disallow free */
 1940 }
 1941 SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL);
 1942 
 1943 
 1944 /* XXX this stuff doesn't belong here... */
 1945 
 1946 static  struct xformsw* xforms = NULL;
 1947 
 1948 /*
 1949  * Register a transform; typically at system startup.
 1950  */
 1951 void
 1952 xform_register(struct xformsw* xsp)
 1953 {
 1954         xsp->xf_next = xforms;
 1955         xforms = xsp;
 1956 }
 1957 
 1958 /*
 1959  * Initialize transform support in an sav.
 1960  */
 1961 int
 1962 xform_init(struct secasvar *sav, int xftype)
 1963 {
 1964         struct xformsw *xsp;
 1965 
 1966         if (sav->tdb_xform != NULL)     /* previously initialized */
 1967                 return 0;
 1968         for (xsp = xforms; xsp; xsp = xsp->xf_next)
 1969                 if (xsp->xf_type == xftype)
 1970                         return (*xsp->xf_init)(sav, xsp);
 1971         return EINVAL;
 1972 }

Cache object: ff0d78d939a706f95e012ddaa09d4533


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.