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


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

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    1 /*      $FreeBSD: stable/9/sys/netipsec/ipsec.c 299628 2016-05-13 08:51:51Z ngie $      */
    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 #include <net/vnet.h>
   60 
   61 #include <netinet/in.h>
   62 #include <netinet/in_systm.h>
   63 #include <netinet/ip.h>
   64 #include <netinet/ip_var.h>
   65 #include <netinet/in_var.h>
   66 #include <netinet/udp.h>
   67 #include <netinet/udp_var.h>
   68 #include <netinet/tcp.h>
   69 #include <netinet/udp.h>
   70 
   71 #include <netinet/ip6.h>
   72 #ifdef INET6
   73 #include <netinet6/ip6_var.h>
   74 #endif
   75 #include <netinet/in_pcb.h>
   76 #ifdef INET6
   77 #include <netinet/icmp6.h>
   78 #endif
   79 
   80 #include <sys/types.h>
   81 #include <netipsec/ipsec.h>
   82 #ifdef INET6
   83 #include <netipsec/ipsec6.h>
   84 #endif
   85 #include <netipsec/ah_var.h>
   86 #include <netipsec/esp_var.h>
   87 #include <netipsec/ipcomp.h>            /*XXX*/
   88 #include <netipsec/ipcomp_var.h>
   89 
   90 #include <netipsec/key.h>
   91 #include <netipsec/keydb.h>
   92 #include <netipsec/key_debug.h>
   93 
   94 #include <netipsec/xform.h>
   95 
   96 #include <machine/in_cksum.h>
   97 
   98 #include <opencrypto/cryptodev.h>
   99 
  100 #ifdef IPSEC_DEBUG
  101 VNET_DEFINE(int, ipsec_debug) = 1;
  102 #else
  103 VNET_DEFINE(int, ipsec_debug) = 0;
  104 #endif
  105 
  106 /* NB: name changed so netstat doesn't use it. */
  107 VNET_DEFINE(struct ipsecstat, ipsec4stat);
  108 VNET_DEFINE(int, ip4_ah_offsetmask) = 0;        /* maybe IP_DF? */
  109 /* DF bit on encap. 0: clear 1: set 2: copy */
  110 VNET_DEFINE(int, ip4_ipsec_dfbit) = 0;
  111 VNET_DEFINE(int, ip4_esp_trans_deflev) = IPSEC_LEVEL_USE;
  112 VNET_DEFINE(int, ip4_esp_net_deflev) = IPSEC_LEVEL_USE;
  113 VNET_DEFINE(int, ip4_ah_trans_deflev) = IPSEC_LEVEL_USE;
  114 VNET_DEFINE(int, ip4_ah_net_deflev) = IPSEC_LEVEL_USE;
  115 VNET_DEFINE(struct secpolicy, ip4_def_policy);
  116 /* ECN ignore(-1)/forbidden(0)/allowed(1) */
  117 VNET_DEFINE(int, ip4_ipsec_ecn) = 0;
  118 VNET_DEFINE(int, ip4_esp_randpad) = -1;
  119 
  120 /*
  121  * Crypto support requirements:
  122  *
  123  *  1   require hardware support
  124  * -1   require software support
  125  *  0   take anything
  126  */
  127 VNET_DEFINE(int, crypto_support) = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE;
  128 
  129 FEATURE(ipsec, "Internet Protocol Security (IPsec)");
  130 #ifdef IPSEC_NAT_T
  131 FEATURE(ipsec_natt, "UDP Encapsulation of IPsec ESP Packets ('NAT-T')");
  132 #endif
  133 
  134 SYSCTL_DECL(_net_inet_ipsec);
  135 
  136 /* net.inet.ipsec */
  137 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, def_policy,
  138         CTLFLAG_RW, &VNET_NAME(ip4_def_policy).policy, 0,
  139         "IPsec default policy.");
  140 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
  141         CTLFLAG_RW, &VNET_NAME(ip4_esp_trans_deflev), 0,
  142         "Default ESP transport mode level");
  143 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
  144         CTLFLAG_RW, &VNET_NAME(ip4_esp_net_deflev), 0,
  145         "Default ESP tunnel mode level.");
  146 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
  147         CTLFLAG_RW, &VNET_NAME(ip4_ah_trans_deflev), 0,
  148         "AH transfer mode default level.");
  149 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
  150         CTLFLAG_RW, &VNET_NAME(ip4_ah_net_deflev), 0,
  151         "AH tunnel mode default level.");
  152 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, ah_cleartos,
  153         CTLFLAG_RW, &VNET_NAME(ah_cleartos), 0,
  154         "If set clear type-of-service field when doing AH computation.");
  155 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, ah_offsetmask,
  156         CTLFLAG_RW, &VNET_NAME(ip4_ah_offsetmask), 0,
  157         "If not set clear offset field mask when doing AH computation.");
  158 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DFBIT, dfbit,
  159         CTLFLAG_RW, &VNET_NAME(ip4_ipsec_dfbit), 0,
  160         "Do not fragment bit on encap.");
  161 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_ECN, ecn,
  162         CTLFLAG_RW, &VNET_NAME(ip4_ipsec_ecn), 0,
  163         "Explicit Congestion Notification handling.");
  164 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEBUG, debug,
  165         CTLFLAG_RW, &VNET_NAME(ipsec_debug), 0,
  166         "Enable IPsec debugging output when set.");
  167 SYSCTL_VNET_INT(_net_inet_ipsec, OID_AUTO, crypto_support,
  168         CTLFLAG_RW, &VNET_NAME(crypto_support), 0,
  169         "Crypto driver selection.");
  170 SYSCTL_VNET_STRUCT(_net_inet_ipsec, OID_AUTO, ipsecstats,
  171         CTLFLAG_RD, &VNET_NAME(ipsec4stat), ipsecstat,  
  172         "IPsec IPv4 statistics.");
  173 
  174 #ifdef REGRESSION
  175 /*
  176  * When set to 1, IPsec will send packets with the same sequence number.
  177  * This allows to verify if the other side has proper replay attacks detection.
  178  */
  179 VNET_DEFINE(int, ipsec_replay) = 0;
  180 SYSCTL_VNET_INT(_net_inet_ipsec, OID_AUTO, test_replay,
  181         CTLFLAG_RW, &VNET_NAME(ipsec_replay), 0,
  182         "Emulate replay attack");
  183 /*
  184  * When set 1, IPsec will send packets with corrupted HMAC.
  185  * This allows to verify if the other side properly detects modified packets.
  186  */
  187 VNET_DEFINE(int, ipsec_integrity) = 0;
  188 SYSCTL_VNET_INT(_net_inet_ipsec, OID_AUTO, test_integrity,
  189         CTLFLAG_RW, &VNET_NAME(ipsec_integrity), 0,
  190         "Emulate man-in-the-middle attack");
  191 #endif
  192 
  193 #ifdef INET6 
  194 VNET_DEFINE(struct ipsecstat, ipsec6stat);
  195 VNET_DEFINE(int, ip6_esp_trans_deflev) = IPSEC_LEVEL_USE;
  196 VNET_DEFINE(int, ip6_esp_net_deflev) = IPSEC_LEVEL_USE;
  197 VNET_DEFINE(int, ip6_ah_trans_deflev) = IPSEC_LEVEL_USE;
  198 VNET_DEFINE(int, ip6_ah_net_deflev) = IPSEC_LEVEL_USE;
  199 VNET_DEFINE(int, ip6_ipsec_ecn) = 0;    /* ECN ignore(-1)/forbidden(0)/allowed(1) */
  200 
  201 SYSCTL_DECL(_net_inet6_ipsec6);
  202 
  203 /* net.inet6.ipsec6 */
  204 #ifdef COMPAT_KAME
  205 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD,
  206     0, 0, compat_ipsecstats_sysctl, "S", "IPsec IPv6 statistics.");
  207 #endif /* COMPAT_KAME */
  208 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, def_policy, CTLFLAG_RW,
  209         &VNET_NAME(ip4_def_policy).policy, 0,
  210         "IPsec default policy.");
  211 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, 
  212         esp_trans_deflev, CTLFLAG_RW, &VNET_NAME(ip6_esp_trans_deflev), 0,
  213         "Default ESP transport mode level.");
  214 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, 
  215         esp_net_deflev, CTLFLAG_RW, &VNET_NAME(ip6_esp_net_deflev),     0,
  216         "Default ESP tunnel mode level.");
  217 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, 
  218         ah_trans_deflev, CTLFLAG_RW, &VNET_NAME(ip6_ah_trans_deflev),   0,
  219         "AH transfer mode default level.");
  220 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, 
  221         ah_net_deflev, CTLFLAG_RW, &VNET_NAME(ip6_ah_net_deflev),       0,
  222         "AH tunnel mode default level.");
  223 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
  224         ecn, CTLFLAG_RW, &VNET_NAME(ip6_ipsec_ecn),     0,
  225         "Explicit Congestion Notification handling.");
  226 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, debug, CTLFLAG_RW,
  227         &VNET_NAME(ipsec_debug), 0,
  228         "Enable IPsec debugging output when set.");
  229 SYSCTL_VNET_STRUCT(_net_inet6_ipsec6, IPSECCTL_STATS,
  230         ipsecstats, CTLFLAG_RD, &VNET_NAME(ipsec6stat), ipsecstat,
  231         "IPsec IPv6 statistics.");
  232 #endif /* INET6 */
  233 
  234 static int ipsec_setspidx_inpcb __P((struct mbuf *, struct inpcb *));
  235 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int));
  236 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
  237 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
  238 #ifdef INET6
  239 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
  240 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
  241 #endif
  242 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *));
  243 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src));
  244 static void vshiftl __P((unsigned char *, int, int));
  245 
  246 MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy");
  247 
  248 /*
  249  * Return a held reference to the default SP.
  250  */
  251 static struct secpolicy *
  252 key_allocsp_default(const char* where, int tag)
  253 {
  254         struct secpolicy *sp;
  255 
  256         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
  257                 printf("DP key_allocsp_default from %s:%u\n", where, tag));
  258 
  259         sp = &V_ip4_def_policy;
  260         if (sp->policy != IPSEC_POLICY_DISCARD &&
  261             sp->policy != IPSEC_POLICY_NONE) {
  262                 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n",
  263                     sp->policy, IPSEC_POLICY_NONE));
  264                 sp->policy = IPSEC_POLICY_NONE;
  265         }
  266         key_addref(sp);
  267 
  268         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
  269                 printf("DP key_allocsp_default returns SP:%p (%u)\n",
  270                         sp, sp->refcnt));
  271         return (sp);
  272 }
  273 #define KEY_ALLOCSP_DEFAULT() \
  274         key_allocsp_default(__FILE__, __LINE__)
  275 
  276 /*
  277  * For OUTBOUND packet having a socket. Searching SPD for packet,
  278  * and return a pointer to SP.
  279  * OUT: NULL:   no apropreate SP found, the following value is set to error.
  280  *              0       : bypass
  281  *              EACCES  : discard packet.
  282  *              ENOENT  : ipsec_acquire() in progress, maybe.
  283  *              others  : error occured.
  284  *      others: a pointer to SP
  285  *
  286  * NOTE: IPv6 mapped adddress concern is implemented here.
  287  */
  288 struct secpolicy *
  289 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir)
  290 {
  291         struct secpolicy *sp;
  292 
  293         IPSEC_ASSERT(tdbi != NULL, ("null tdbi"));
  294         IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
  295                 ("invalid direction %u", dir));
  296 
  297         sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir);
  298         if (sp == NULL)                 /*XXX????*/
  299                 sp = KEY_ALLOCSP_DEFAULT();
  300         IPSEC_ASSERT(sp != NULL, ("null SP"));
  301         return (sp);
  302 }
  303 
  304 /*
  305  * For OUTBOUND packet having a socket. Searching SPD for packet,
  306  * and return a pointer to SP.
  307  * OUT: NULL:   no apropreate SP found, the following value is set to error.
  308  *              0       : bypass
  309  *              EACCES  : discard packet.
  310  *              ENOENT  : ipsec_acquire() in progress, maybe.
  311  *              others  : error occured.
  312  *      others: a pointer to SP
  313  *
  314  * NOTE: IPv6 mapped adddress concern is implemented here.
  315  */
  316 static struct secpolicy *
  317 ipsec_getpolicybysock(struct mbuf *m, u_int dir, struct inpcb *inp, int *error)
  318 {
  319         struct inpcbpolicy *pcbsp;
  320         struct secpolicy *currsp = NULL;        /* Policy on socket. */
  321         struct secpolicy *sp;
  322 
  323         IPSEC_ASSERT(m != NULL, ("null mbuf"));
  324         IPSEC_ASSERT(inp != NULL, ("null inpcb"));
  325         IPSEC_ASSERT(error != NULL, ("null error"));
  326         IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
  327                 ("invalid direction %u", dir));
  328 
  329         /* Set spidx in pcb. */
  330         *error = ipsec_setspidx_inpcb(m, inp);
  331         if (*error)
  332                 return (NULL);
  333 
  334         pcbsp = inp->inp_sp;
  335         IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp"));
  336         switch (dir) {
  337         case IPSEC_DIR_INBOUND:
  338                 currsp = pcbsp->sp_in;
  339                 break;
  340         case IPSEC_DIR_OUTBOUND:
  341                 currsp = pcbsp->sp_out;
  342                 break;
  343         }
  344         IPSEC_ASSERT(currsp != NULL, ("null currsp"));
  345 
  346         if (pcbsp->priv) {                      /* When privilieged socket. */
  347                 switch (currsp->policy) {
  348                 case IPSEC_POLICY_BYPASS:
  349                 case IPSEC_POLICY_IPSEC:
  350                         key_addref(currsp);
  351                         sp = currsp;
  352                         break;
  353 
  354                 case IPSEC_POLICY_ENTRUST:
  355                         /* Look for a policy in SPD. */
  356                         sp = KEY_ALLOCSP(&currsp->spidx, dir);
  357                         if (sp == NULL)         /* No SP found. */
  358                                 sp = KEY_ALLOCSP_DEFAULT();
  359                         break;
  360 
  361                 default:
  362                         ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n",
  363                                 __func__, currsp->policy));
  364                         *error = EINVAL;
  365                         return (NULL);
  366                 }
  367         } else {                                /* Unpriv, SPD has policy. */
  368                 sp = KEY_ALLOCSP(&currsp->spidx, dir);
  369                 if (sp == NULL) {               /* No SP found. */
  370                         switch (currsp->policy) {
  371                         case IPSEC_POLICY_BYPASS:
  372                                 ipseclog((LOG_ERR, "%s: Illegal policy for "
  373                                         "non-priviliged defined %d\n",
  374                                         __func__, currsp->policy));
  375                                 *error = EINVAL;
  376                                 return (NULL);
  377 
  378                         case IPSEC_POLICY_ENTRUST:
  379                                 sp = KEY_ALLOCSP_DEFAULT();
  380                                 break;
  381 
  382                         case IPSEC_POLICY_IPSEC:
  383                                 key_addref(currsp);
  384                                 sp = currsp;
  385                                 break;
  386 
  387                         default:
  388                                 ipseclog((LOG_ERR, "%s: Invalid policy for "
  389                                         "PCB %d\n", __func__, currsp->policy));
  390                                 *error = EINVAL;
  391                                 return (NULL);
  392                         }
  393                 }
  394         }
  395         IPSEC_ASSERT(sp != NULL,
  396                 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy));
  397         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
  398                 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n",
  399                         __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt));
  400         return (sp);
  401 }
  402 
  403 /*
  404  * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
  405  * and return a pointer to SP.
  406  * OUT: positive: a pointer to the entry for security policy leaf matched.
  407  *      NULL:   no apropreate SP found, the following value is set to error.
  408  *              0       : bypass
  409  *              EACCES  : discard packet.
  410  *              ENOENT  : ipsec_acquire() in progress, maybe.
  411  *              others  : error occured.
  412  */
  413 struct secpolicy *
  414 ipsec_getpolicybyaddr(struct mbuf *m, u_int dir, int flag, int *error)
  415 {
  416         struct secpolicyindex spidx;
  417         struct secpolicy *sp;
  418 
  419         IPSEC_ASSERT(m != NULL, ("null mbuf"));
  420         IPSEC_ASSERT(error != NULL, ("null error"));
  421         IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
  422                 ("invalid direction %u", dir));
  423 
  424         sp = NULL;
  425         if (key_havesp(dir)) {
  426                 /* Make an index to look for a policy. */
  427                 *error = ipsec_setspidx(m, &spidx,
  428                                         (flag & IP_FORWARDING) ? 0 : 1);
  429                 if (*error != 0) {
  430                         DPRINTF(("%s: setpidx failed, dir %u flag %u\n",
  431                                 __func__, dir, flag));
  432                         return (NULL);
  433                 }
  434                 spidx.dir = dir;
  435 
  436                 sp = KEY_ALLOCSP(&spidx, dir);
  437         }
  438         if (sp == NULL)                 /* No SP found, use system default. */
  439                 sp = KEY_ALLOCSP_DEFAULT();
  440         IPSEC_ASSERT(sp != NULL, ("null SP"));
  441         return (sp);
  442 }
  443 
  444 struct secpolicy *
  445 ipsec4_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error,
  446     struct inpcb *inp)
  447 {
  448         struct secpolicy *sp;
  449 
  450         *error = 0;
  451         if (inp == NULL)
  452                 sp = ipsec_getpolicybyaddr(m, dir, flag, error);
  453         else
  454                 sp = ipsec_getpolicybysock(m, dir, inp, error);
  455         if (sp == NULL) {
  456                 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error"));
  457                 IPSECSTAT_INC(ips_out_inval);
  458                 return (NULL);
  459         }
  460         IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error));
  461         switch (sp->policy) {
  462         case IPSEC_POLICY_ENTRUST:
  463         default:
  464                 printf("%s: invalid policy %u\n", __func__, sp->policy);
  465                 /* FALLTHROUGH */
  466         case IPSEC_POLICY_DISCARD:
  467                 IPSECSTAT_INC(ips_out_polvio);
  468                 *error = -EINVAL;       /* Packet is discarded by caller. */
  469                 break;
  470         case IPSEC_POLICY_BYPASS:
  471         case IPSEC_POLICY_NONE:
  472                 KEY_FREESP(&sp);
  473                 sp = NULL;              /* NB: force NULL result. */
  474                 break;
  475         case IPSEC_POLICY_IPSEC:
  476                 if (sp->req == NULL)    /* Acquire a SA. */
  477                         *error = key_spdacquire(sp);
  478                 break;
  479         }
  480         if (*error != 0) {
  481                 KEY_FREESP(&sp);
  482                 sp = NULL;
  483         }
  484         return (sp);
  485 }
  486 
  487 static int
  488 ipsec_setspidx_inpcb(struct mbuf *m, struct inpcb *inp)
  489 {
  490         int error;
  491 
  492         IPSEC_ASSERT(inp != NULL, ("null inp"));
  493         IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp"));
  494         IPSEC_ASSERT(inp->inp_sp->sp_out != NULL && inp->inp_sp->sp_in != NULL,
  495                 ("null sp_in || sp_out"));
  496 
  497         error = ipsec_setspidx(m, &inp->inp_sp->sp_in->spidx, 1);
  498         if (error == 0) {
  499                 inp->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
  500                 inp->inp_sp->sp_out->spidx = inp->inp_sp->sp_in->spidx;
  501                 inp->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
  502         } else {
  503                 bzero(&inp->inp_sp->sp_in->spidx,
  504                         sizeof (inp->inp_sp->sp_in->spidx));
  505                 bzero(&inp->inp_sp->sp_out->spidx,
  506                         sizeof (inp->inp_sp->sp_in->spidx));
  507         }
  508         return (error);
  509 }
  510 
  511 /*
  512  * Configure security policy index (src/dst/proto/sport/dport)
  513  * by looking at the content of mbuf.
  514  * The caller is responsible for error recovery (like clearing up spidx).
  515  */
  516 static int
  517 ipsec_setspidx(struct mbuf *m, struct secpolicyindex *spidx, int needport)
  518 {
  519         struct ip *ip = NULL;
  520         struct ip ipbuf;
  521         u_int v;
  522         struct mbuf *n;
  523         int len;
  524         int error;
  525 
  526         IPSEC_ASSERT(m != NULL, ("null mbuf"));
  527 
  528         /*
  529          * Validate m->m_pkthdr.len.  We see incorrect length if we
  530          * mistakenly call this function with inconsistent mbuf chain
  531          * (like 4.4BSD tcp/udp processing).  XXX Should we panic here?
  532          */
  533         len = 0;
  534         for (n = m; n; n = n->m_next)
  535                 len += n->m_len;
  536         if (m->m_pkthdr.len != len) {
  537                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
  538                         printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n",
  539                                 __func__, len, m->m_pkthdr.len));
  540                 return (EINVAL);
  541         }
  542 
  543         if (m->m_pkthdr.len < sizeof(struct ip)) {
  544                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
  545                         printf("%s: pkthdr len(%d) too small (v4), ignored.\n",
  546                             __func__, m->m_pkthdr.len));
  547                 return (EINVAL);
  548         }
  549 
  550         if (m->m_len >= sizeof(*ip))
  551                 ip = mtod(m, struct ip *);
  552         else {
  553                 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
  554                 ip = &ipbuf;
  555         }
  556         v = ip->ip_v;
  557         switch (v) {
  558         case 4:
  559                 error = ipsec4_setspidx_ipaddr(m, spidx);
  560                 if (error)
  561                         return (error);
  562                 ipsec4_get_ulp(m, spidx, needport);
  563                 return (0);
  564 #ifdef INET6
  565         case 6:
  566                 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
  567                         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
  568                                 printf("%s: pkthdr len(%d) too small (v6), "
  569                                 "ignored\n", __func__, m->m_pkthdr.len));
  570                         return (EINVAL);
  571                 }
  572                 error = ipsec6_setspidx_ipaddr(m, spidx);
  573                 if (error)
  574                         return (error);
  575                 ipsec6_get_ulp(m, spidx, needport);
  576                 return (0);
  577 #endif
  578         default:
  579                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
  580                         printf("%s: " "unknown IP version %u, ignored.\n",
  581                                 __func__, v));
  582                 return (EINVAL);
  583         }
  584 }
  585 
  586 static void
  587 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
  588 {
  589         u_int8_t nxt;
  590         int off;
  591 
  592         /* Sanity check. */
  593         IPSEC_ASSERT(m != NULL, ("null mbuf"));
  594         IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short"));
  595 
  596         /* NB: ip_input() flips it into host endian. XXX Need more checking. */
  597         if (m->m_len >= sizeof (struct ip)) {
  598                 struct ip *ip = mtod(m, struct ip *);
  599                 if (ip->ip_off & (IP_MF | IP_OFFMASK))
  600                         goto done;
  601                 off = ip->ip_hl << 2;
  602                 nxt = ip->ip_p;
  603         } else {
  604                 struct ip ih;
  605 
  606                 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih);
  607                 if (ih.ip_off & (IP_MF | IP_OFFMASK))
  608                         goto done;
  609                 off = ih.ip_hl << 2;
  610                 nxt = ih.ip_p;
  611         }
  612 
  613         while (off < m->m_pkthdr.len) {
  614                 struct ip6_ext ip6e;
  615                 struct tcphdr th;
  616                 struct udphdr uh;
  617 
  618                 switch (nxt) {
  619                 case IPPROTO_TCP:
  620                         spidx->ul_proto = nxt;
  621                         if (!needport)
  622                                 goto done_proto;
  623                         if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
  624                                 goto done;
  625                         m_copydata(m, off, sizeof (th), (caddr_t) &th);
  626                         spidx->src.sin.sin_port = th.th_sport;
  627                         spidx->dst.sin.sin_port = th.th_dport;
  628                         return;
  629                 case IPPROTO_UDP:
  630                         spidx->ul_proto = nxt;
  631                         if (!needport)
  632                                 goto done_proto;
  633                         if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
  634                                 goto done;
  635                         m_copydata(m, off, sizeof (uh), (caddr_t) &uh);
  636                         spidx->src.sin.sin_port = uh.uh_sport;
  637                         spidx->dst.sin.sin_port = uh.uh_dport;
  638                         return;
  639                 case IPPROTO_AH:
  640                         if (off + sizeof(ip6e) > m->m_pkthdr.len)
  641                                 goto done;
  642                         /* XXX Sigh, this works but is totally bogus. */
  643                         m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e);
  644                         off += (ip6e.ip6e_len + 2) << 2;
  645                         nxt = ip6e.ip6e_nxt;
  646                         break;
  647                 case IPPROTO_ICMP:
  648                 default:
  649                         /* XXX Intermediate headers??? */
  650                         spidx->ul_proto = nxt;
  651                         goto done_proto;
  652                 }
  653         }
  654 done:
  655         spidx->ul_proto = IPSEC_ULPROTO_ANY;
  656 done_proto:
  657         spidx->src.sin.sin_port = IPSEC_PORT_ANY;
  658         spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
  659 }
  660 
  661 /* Assumes that m is sane. */
  662 static int
  663 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
  664 {
  665         static const struct sockaddr_in template = {
  666                 sizeof (struct sockaddr_in),
  667                 AF_INET,
  668                 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
  669         };
  670 
  671         spidx->src.sin = template;
  672         spidx->dst.sin = template;
  673 
  674         if (m->m_len < sizeof (struct ip)) {
  675                 m_copydata(m, offsetof(struct ip, ip_src),
  676                            sizeof (struct  in_addr),
  677                            (caddr_t) &spidx->src.sin.sin_addr);
  678                 m_copydata(m, offsetof(struct ip, ip_dst),
  679                            sizeof (struct  in_addr),
  680                            (caddr_t) &spidx->dst.sin.sin_addr);
  681         } else {
  682                 struct ip *ip = mtod(m, struct ip *);
  683                 spidx->src.sin.sin_addr = ip->ip_src;
  684                 spidx->dst.sin.sin_addr = ip->ip_dst;
  685         }
  686 
  687         spidx->prefs = sizeof(struct in_addr) << 3;
  688         spidx->prefd = sizeof(struct in_addr) << 3;
  689 
  690         return (0);
  691 }
  692 
  693 #ifdef INET6
  694 static void
  695 ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
  696 {
  697         int off, nxt;
  698         struct tcphdr th;
  699         struct udphdr uh;
  700         struct icmp6_hdr ih;
  701 
  702         /* Sanity check. */
  703         if (m == NULL)
  704                 panic("%s: NULL pointer was passed.\n", __func__);
  705 
  706         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
  707                 printf("%s:\n", __func__); kdebug_mbuf(m));
  708 
  709         /* Set default. */
  710         spidx->ul_proto = IPSEC_ULPROTO_ANY;
  711         ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
  712         ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
  713 
  714         nxt = -1;
  715         off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
  716         if (off < 0 || m->m_pkthdr.len < off)
  717                 return;
  718 
  719         switch (nxt) {
  720         case IPPROTO_TCP:
  721                 spidx->ul_proto = nxt;
  722                 if (!needport)
  723                         break;
  724                 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
  725                         break;
  726                 m_copydata(m, off, sizeof(th), (caddr_t)&th);
  727                 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
  728                 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
  729                 break;
  730         case IPPROTO_UDP:
  731                 spidx->ul_proto = nxt;
  732                 if (!needport)
  733                         break;
  734                 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
  735                         break;
  736                 m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
  737                 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
  738                 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
  739                 break;
  740         case IPPROTO_ICMPV6:
  741                 spidx->ul_proto = nxt;
  742                 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len)
  743                         break;
  744                 m_copydata(m, off, sizeof(ih), (caddr_t)&ih);
  745                 ((struct sockaddr_in6 *)&spidx->src)->sin6_port =
  746                     htons((uint16_t)ih.icmp6_type);
  747                 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port =
  748                     htons((uint16_t)ih.icmp6_code);
  749                 break;
  750         default:
  751                 /* XXX Intermediate headers??? */
  752                 spidx->ul_proto = nxt;
  753                 break;
  754         }
  755 }
  756 
  757 /* Assumes that m is sane. */
  758 static int
  759 ipsec6_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
  760 {
  761         struct ip6_hdr *ip6 = NULL;
  762         struct ip6_hdr ip6buf;
  763         struct sockaddr_in6 *sin6;
  764 
  765         if (m->m_len >= sizeof(*ip6))
  766                 ip6 = mtod(m, struct ip6_hdr *);
  767         else {
  768                 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
  769                 ip6 = &ip6buf;
  770         }
  771 
  772         sin6 = (struct sockaddr_in6 *)&spidx->src;
  773         bzero(sin6, sizeof(*sin6));
  774         sin6->sin6_family = AF_INET6;
  775         sin6->sin6_len = sizeof(struct sockaddr_in6);
  776         bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
  777         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
  778                 sin6->sin6_addr.s6_addr16[1] = 0;
  779                 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
  780         }
  781         spidx->prefs = sizeof(struct in6_addr) << 3;
  782 
  783         sin6 = (struct sockaddr_in6 *)&spidx->dst;
  784         bzero(sin6, sizeof(*sin6));
  785         sin6->sin6_family = AF_INET6;
  786         sin6->sin6_len = sizeof(struct sockaddr_in6);
  787         bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
  788         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
  789                 sin6->sin6_addr.s6_addr16[1] = 0;
  790                 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
  791         }
  792         spidx->prefd = sizeof(struct in6_addr) << 3;
  793 
  794         return (0);
  795 }
  796 #endif
  797 
  798 static void
  799 ipsec_delpcbpolicy(struct inpcbpolicy *p)
  800 {
  801 
  802         free(p, M_IPSEC_INPCB);
  803 }
  804 
  805 /* Initialize policy in PCB. */
  806 int
  807 ipsec_init_policy(struct socket *so, struct inpcbpolicy **pcb_sp)
  808 {
  809         struct inpcbpolicy *new;
  810 
  811         /* Sanity check. */
  812         if (so == NULL || pcb_sp == NULL)
  813                 panic("%s: NULL pointer was passed.\n", __func__);
  814 
  815         new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy),
  816                                             M_IPSEC_INPCB, M_NOWAIT|M_ZERO);
  817         if (new == NULL) {
  818                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
  819                 return (ENOBUFS);
  820         }
  821 
  822         new->priv = IPSEC_IS_PRIVILEGED_SO(so);
  823 
  824         if ((new->sp_in = KEY_NEWSP()) == NULL) {
  825                 ipsec_delpcbpolicy(new);
  826                 return (ENOBUFS);
  827         }
  828         new->sp_in->state = IPSEC_SPSTATE_ALIVE;
  829         new->sp_in->policy = IPSEC_POLICY_ENTRUST;
  830 
  831         if ((new->sp_out = KEY_NEWSP()) == NULL) {
  832                 KEY_FREESP(&new->sp_in);
  833                 ipsec_delpcbpolicy(new);
  834                 return (ENOBUFS);
  835         }
  836         new->sp_out->state = IPSEC_SPSTATE_ALIVE;
  837         new->sp_out->policy = IPSEC_POLICY_ENTRUST;
  838 
  839         *pcb_sp = new;
  840 
  841         return (0);
  842 }
  843 
  844 /* Copy old IPsec policy into new. */
  845 int
  846 ipsec_copy_policy(struct inpcbpolicy *old, struct inpcbpolicy *new)
  847 {
  848         struct secpolicy *sp;
  849 
  850         sp = ipsec_deepcopy_policy(old->sp_in);
  851         if (sp) {
  852                 KEY_FREESP(&new->sp_in);
  853                 new->sp_in = sp;
  854         } else
  855                 return (ENOBUFS);
  856 
  857         sp = ipsec_deepcopy_policy(old->sp_out);
  858         if (sp) {
  859                 KEY_FREESP(&new->sp_out);
  860                 new->sp_out = sp;
  861         } else
  862                 return (ENOBUFS);
  863 
  864         new->priv = old->priv;
  865 
  866         return (0);
  867 }
  868 
  869 struct ipsecrequest *
  870 ipsec_newisr(void)
  871 {
  872         struct ipsecrequest *p;
  873 
  874         p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO);
  875         if (p != NULL)
  876                 IPSECREQUEST_LOCK_INIT(p);
  877         return (p);
  878 }
  879 
  880 void
  881 ipsec_delisr(struct ipsecrequest *p)
  882 {
  883 
  884         IPSECREQUEST_LOCK_DESTROY(p);
  885         free(p, M_IPSEC_SR);
  886 }
  887 
  888 /* Deep-copy a policy in PCB. */
  889 static struct secpolicy *
  890 ipsec_deepcopy_policy(struct secpolicy *src)
  891 {
  892         struct ipsecrequest *newchain = NULL;
  893         struct ipsecrequest *p;
  894         struct ipsecrequest **q;
  895         struct ipsecrequest *r;
  896         struct secpolicy *dst;
  897 
  898         if (src == NULL)
  899                 return (NULL);
  900         dst = KEY_NEWSP();
  901         if (dst == NULL)
  902                 return (NULL);
  903 
  904         /*
  905          * Deep-copy IPsec request chain.  This is required since struct
  906          * ipsecrequest is not reference counted.
  907          */
  908         q = &newchain;
  909         for (p = src->req; p; p = p->next) {
  910                 *q = ipsec_newisr();
  911                 if (*q == NULL)
  912                         goto fail;
  913                 (*q)->saidx.proto = p->saidx.proto;
  914                 (*q)->saidx.mode = p->saidx.mode;
  915                 (*q)->level = p->level;
  916                 (*q)->saidx.reqid = p->saidx.reqid;
  917 
  918                 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
  919                 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
  920 
  921                 (*q)->sp = dst;
  922 
  923                 q = &((*q)->next);
  924         }
  925 
  926         dst->req = newchain;
  927         dst->state = src->state;
  928         dst->policy = src->policy;
  929         /* Do not touch the refcnt fields. */
  930 
  931         return (dst);
  932 
  933 fail:
  934         for (p = newchain; p; p = r) {
  935                 r = p->next;
  936                 ipsec_delisr(p);
  937                 p = NULL;
  938         }
  939         KEY_FREESP(&dst);
  940         return (NULL);
  941 }
  942 
  943 /* Set policy and IPsec request if present. */
  944 static int
  945 ipsec_set_policy_internal(struct secpolicy **pcb_sp, int optname,
  946     caddr_t request, size_t len, struct ucred *cred)
  947 {
  948         struct sadb_x_policy *xpl;
  949         struct secpolicy *newsp = NULL;
  950         int error;
  951 
  952         /* Sanity check. */
  953         if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
  954                 return (EINVAL);
  955         if (len < sizeof(*xpl))
  956                 return (EINVAL);
  957         xpl = (struct sadb_x_policy *)request;
  958 
  959         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
  960                 printf("%s: passed policy\n", __func__);
  961                 kdebug_sadb_x_policy((struct sadb_ext *)xpl));
  962 
  963         /* Check policy type. */
  964         /* ipsec_set_policy_internal() accepts IPSEC, ENTRUST and BYPASS. */
  965         if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
  966          || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
  967                 return (EINVAL);
  968 
  969         /* Check privileged socket. */
  970         if (cred != NULL && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) {
  971                 error = priv_check_cred(cred, PRIV_NETINET_IPSEC, 0);
  972                 if (error)
  973                         return (EACCES);
  974         }
  975 
  976         /* Allocating new SP entry. */
  977         if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
  978                 return (error);
  979 
  980         newsp->state = IPSEC_SPSTATE_ALIVE;
  981 
  982         /* Clear old SP and set new SP. */
  983         KEY_FREESP(pcb_sp);
  984         *pcb_sp = newsp;
  985         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
  986                 printf("%s: new policy\n", __func__);
  987                 kdebug_secpolicy(newsp));
  988 
  989         return (0);
  990 }
  991 
  992 int
  993 ipsec_set_policy(struct inpcb *inp, int optname, caddr_t request,
  994     size_t len, struct ucred *cred)
  995 {
  996         struct sadb_x_policy *xpl;
  997         struct secpolicy **pcb_sp;
  998 
  999         /* Sanity check. */
 1000         if (inp == NULL || request == NULL)
 1001                 return (EINVAL);
 1002         if (len < sizeof(*xpl))
 1003                 return (EINVAL);
 1004         xpl = (struct sadb_x_policy *)request;
 1005 
 1006         /* Select direction. */
 1007         switch (xpl->sadb_x_policy_dir) {
 1008         case IPSEC_DIR_INBOUND:
 1009                 pcb_sp = &inp->inp_sp->sp_in;
 1010                 break;
 1011         case IPSEC_DIR_OUTBOUND:
 1012                 pcb_sp = &inp->inp_sp->sp_out;
 1013                 break;
 1014         default:
 1015                 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
 1016                         xpl->sadb_x_policy_dir));
 1017                 return (EINVAL);
 1018         }
 1019 
 1020         return (ipsec_set_policy_internal(pcb_sp, optname, request, len, cred));
 1021 }
 1022 
 1023 int
 1024 ipsec_get_policy(struct inpcb *inp, caddr_t request, size_t len,
 1025     struct mbuf **mp)
 1026 {
 1027         struct sadb_x_policy *xpl;
 1028         struct secpolicy *pcb_sp;
 1029 
 1030         /* Sanity check. */
 1031         if (inp == NULL || request == NULL || mp == NULL)
 1032                 return (EINVAL);
 1033         IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp"));
 1034         if (len < sizeof(*xpl))
 1035                 return (EINVAL);
 1036         xpl = (struct sadb_x_policy *)request;
 1037 
 1038         /* Select direction. */
 1039         switch (xpl->sadb_x_policy_dir) {
 1040         case IPSEC_DIR_INBOUND:
 1041                 pcb_sp = inp->inp_sp->sp_in;
 1042                 break;
 1043         case IPSEC_DIR_OUTBOUND:
 1044                 pcb_sp = inp->inp_sp->sp_out;
 1045                 break;
 1046         default:
 1047                 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
 1048                         xpl->sadb_x_policy_dir));
 1049                 return (EINVAL);
 1050         }
 1051 
 1052         /* Sanity check. Should be an IPSEC_ASSERT. */
 1053         if (pcb_sp == NULL)
 1054                 return (EINVAL);
 1055 
 1056         *mp = key_sp2msg(pcb_sp);
 1057         if (!*mp) {
 1058                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
 1059                 return (ENOBUFS);
 1060         }
 1061 
 1062         (*mp)->m_type = MT_DATA;
 1063         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 1064                 printf("%s:\n", __func__); kdebug_mbuf(*mp));
 1065 
 1066         return (0);
 1067 }
 1068 
 1069 /* Delete policy in PCB. */
 1070 int
 1071 ipsec_delete_pcbpolicy(struct inpcb *inp)
 1072 {
 1073         IPSEC_ASSERT(inp != NULL, ("null inp"));
 1074 
 1075         if (inp->inp_sp == NULL)
 1076                 return (0);
 1077 
 1078         if (inp->inp_sp->sp_in != NULL)
 1079                 KEY_FREESP(&inp->inp_sp->sp_in);
 1080 
 1081         if (inp->inp_sp->sp_out != NULL)
 1082                 KEY_FREESP(&inp->inp_sp->sp_out);
 1083 
 1084         ipsec_delpcbpolicy(inp->inp_sp);
 1085         inp->inp_sp = NULL;
 1086 
 1087         return (0);
 1088 }
 1089 
 1090 /*
 1091  * Return current level.
 1092  * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
 1093  */
 1094 u_int
 1095 ipsec_get_reqlevel(struct ipsecrequest *isr)
 1096 {
 1097         u_int level = 0;
 1098         u_int esp_trans_deflev, esp_net_deflev;
 1099         u_int ah_trans_deflev, ah_net_deflev;
 1100 
 1101         IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument"));
 1102         IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
 1103                 ("af family mismatch, src %u, dst %u",
 1104                  isr->sp->spidx.src.sa.sa_family,
 1105                  isr->sp->spidx.dst.sa.sa_family));
 1106 
 1107 /* XXX Note that we have ipseclog() expanded here - code sync issue. */
 1108 #define IPSEC_CHECK_DEFAULT(lev) \
 1109         (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE            \
 1110                         && (lev) != IPSEC_LEVEL_UNIQUE)                       \
 1111                 ? (V_ipsec_debug                                                      \
 1112                         ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
 1113                                 (lev), IPSEC_LEVEL_REQUIRE)                   \
 1114                         : 0),                                                 \
 1115                         (lev) = IPSEC_LEVEL_REQUIRE,                          \
 1116                         (lev)                                                 \
 1117                 : (lev))
 1118 
 1119         /* Set default level. */
 1120         switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
 1121 #ifdef INET
 1122         case AF_INET:
 1123                 esp_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip4_esp_trans_deflev);
 1124                 esp_net_deflev = IPSEC_CHECK_DEFAULT(V_ip4_esp_net_deflev);
 1125                 ah_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip4_ah_trans_deflev);
 1126                 ah_net_deflev = IPSEC_CHECK_DEFAULT(V_ip4_ah_net_deflev);
 1127                 break;
 1128 #endif
 1129 #ifdef INET6
 1130         case AF_INET6:
 1131                 esp_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip6_esp_trans_deflev);
 1132                 esp_net_deflev = IPSEC_CHECK_DEFAULT(V_ip6_esp_net_deflev);
 1133                 ah_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip6_ah_trans_deflev);
 1134                 ah_net_deflev = IPSEC_CHECK_DEFAULT(V_ip6_ah_net_deflev);
 1135                 break;
 1136 #endif /* INET6 */
 1137         default:
 1138                 panic("%s: unknown af %u",
 1139                         __func__, isr->sp->spidx.src.sa.sa_family);
 1140         }
 1141 
 1142 #undef IPSEC_CHECK_DEFAULT
 1143 
 1144         /* Set level. */
 1145         switch (isr->level) {
 1146         case IPSEC_LEVEL_DEFAULT:
 1147                 switch (isr->saidx.proto) {
 1148                 case IPPROTO_ESP:
 1149                         if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
 1150                                 level = esp_net_deflev;
 1151                         else
 1152                                 level = esp_trans_deflev;
 1153                         break;
 1154                 case IPPROTO_AH:
 1155                         if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
 1156                                 level = ah_net_deflev;
 1157                         else
 1158                                 level = ah_trans_deflev;
 1159                         break;
 1160                 case IPPROTO_IPCOMP:
 1161                         /*
 1162                          * We don't really care, as IPcomp document says that
 1163                          * we shouldn't compress small packets.
 1164                          */
 1165                         level = IPSEC_LEVEL_USE;
 1166                         break;
 1167                 default:
 1168                         panic("%s: Illegal protocol defined %u\n", __func__,
 1169                                 isr->saidx.proto);
 1170                 }
 1171                 break;
 1172 
 1173         case IPSEC_LEVEL_USE:
 1174         case IPSEC_LEVEL_REQUIRE:
 1175                 level = isr->level;
 1176                 break;
 1177         case IPSEC_LEVEL_UNIQUE:
 1178                 level = IPSEC_LEVEL_REQUIRE;
 1179                 break;
 1180 
 1181         default:
 1182                 panic("%s: Illegal IPsec level %u\n", __func__, isr->level);
 1183         }
 1184 
 1185         return (level);
 1186 }
 1187 
 1188 /*
 1189  * Check security policy requirements against the actual
 1190  * packet contents.  Return one if the packet should be
 1191  * reject as "invalid"; otherwiser return zero to have the
 1192  * packet treated as "valid".
 1193  *
 1194  * OUT:
 1195  *      0: valid
 1196  *      1: invalid
 1197  */
 1198 int
 1199 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
 1200 {
 1201         struct ipsecrequest *isr;
 1202         int need_auth;
 1203 
 1204         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
 1205                 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp));
 1206 
 1207         /* Check policy. */
 1208         switch (sp->policy) {
 1209         case IPSEC_POLICY_DISCARD:
 1210                 return (1);
 1211         case IPSEC_POLICY_BYPASS:
 1212         case IPSEC_POLICY_NONE:
 1213                 return (0);
 1214         }
 1215 
 1216         IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
 1217                 ("invalid policy %u", sp->policy));
 1218 
 1219         /* XXX Should compare policy against IPsec header history. */
 1220 
 1221         need_auth = 0;
 1222         for (isr = sp->req; isr != NULL; isr = isr->next) {
 1223                 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
 1224                         continue;
 1225                 switch (isr->saidx.proto) {
 1226                 case IPPROTO_ESP:
 1227                         if ((m->m_flags & M_DECRYPTED) == 0) {
 1228                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 1229                                     printf("%s: ESP m_flags:%x\n", __func__,
 1230                                             m->m_flags));
 1231                                 return (1);
 1232                         }
 1233 
 1234                         if (!need_auth &&
 1235                             isr->sav != NULL &&
 1236                             isr->sav->tdb_authalgxform != NULL &&
 1237                             (m->m_flags & M_AUTHIPDGM) == 0) {
 1238                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 1239                                     printf("%s: ESP/AH m_flags:%x\n", __func__,
 1240                                             m->m_flags));
 1241                                 return (1);
 1242                         }
 1243                         break;
 1244                 case IPPROTO_AH:
 1245                         need_auth = 1;
 1246                         if ((m->m_flags & M_AUTHIPHDR) == 0) {
 1247                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 1248                                     printf("%s: AH m_flags:%x\n", __func__,
 1249                                             m->m_flags));
 1250                                 return (1);
 1251                         }
 1252                         break;
 1253                 case IPPROTO_IPCOMP:
 1254                         /*
 1255                          * We don't really care, as IPcomp document
 1256                          * says that we shouldn't compress small
 1257                          * packets.  IPComp policy should always be
 1258                          * treated as being in "use" level.
 1259                          */
 1260                         break;
 1261                 }
 1262         }
 1263         return (0);             /* Valid. */
 1264 }
 1265 
 1266 static int
 1267 ipsec46_in_reject(struct mbuf *m, struct inpcb *inp)
 1268 {
 1269         struct secpolicy *sp;
 1270         int error;
 1271         int result;
 1272 
 1273         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 1274 
 1275         /*
 1276          * Get SP for this packet.
 1277          * When we are called from ip_forward(), we call
 1278          * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
 1279          */
 1280         if (inp == NULL)
 1281                 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
 1282         else
 1283                 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
 1284 
 1285         if (sp != NULL) {
 1286                 result = ipsec_in_reject(sp, m);
 1287                 KEY_FREESP(&sp);
 1288         } else {
 1289                 result = 0;     /* XXX Should be panic?
 1290                                  * -> No, there may be error. */
 1291         }
 1292         return (result);
 1293 }
 1294 
 1295 /*
 1296  * Check AH/ESP integrity.
 1297  * This function is called from tcp_input(), udp_input(),
 1298  * and {ah,esp}4_input for tunnel mode.
 1299  */
 1300 int
 1301 ipsec4_in_reject(struct mbuf *m, struct inpcb *inp)
 1302 {
 1303         int result;
 1304 
 1305         result = ipsec46_in_reject(m, inp);
 1306         if (result)
 1307                 IPSECSTAT_INC(ips_in_polvio);
 1308 
 1309         return (result);
 1310 }
 1311 
 1312 #ifdef INET6
 1313 /*
 1314  * Check AH/ESP integrity.
 1315  * This function is called from tcp6_input(), udp6_input(),
 1316  * and {ah,esp}6_input for tunnel mode.
 1317  */
 1318 int
 1319 ipsec6_in_reject(struct mbuf *m, struct inpcb *inp)
 1320 {
 1321         int result;
 1322 
 1323         result = ipsec46_in_reject(m, inp);
 1324         if (result)
 1325                 IPSEC6STAT_INC(ips_in_polvio);
 1326 
 1327         return (result);
 1328 }
 1329 #endif
 1330 
 1331 /*
 1332  * Compute the byte size to be occupied by IPsec header.
 1333  * In case it is tunnelled, it includes the size of outer IP header.
 1334  * NOTE: SP passed is freed in this function.
 1335  */
 1336 static size_t
 1337 ipsec_hdrsiz_internal(struct secpolicy *sp)
 1338 {
 1339         struct ipsecrequest *isr;
 1340         size_t size;
 1341 
 1342         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
 1343                 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp));
 1344 
 1345         switch (sp->policy) {
 1346         case IPSEC_POLICY_DISCARD:
 1347         case IPSEC_POLICY_BYPASS:
 1348         case IPSEC_POLICY_NONE:
 1349                 return (0);
 1350         }
 1351 
 1352         IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
 1353                 ("invalid policy %u", sp->policy));
 1354 
 1355         size = 0;
 1356         for (isr = sp->req; isr != NULL; isr = isr->next) {
 1357                 size_t clen = 0;
 1358 
 1359                 switch (isr->saidx.proto) {
 1360                 case IPPROTO_ESP:
 1361                         clen = esp_hdrsiz(isr->sav);
 1362                         break;
 1363                 case IPPROTO_AH:
 1364                         clen = ah_hdrsiz(isr->sav);
 1365                         break;
 1366                 case IPPROTO_IPCOMP:
 1367                         clen = sizeof(struct ipcomp);
 1368                         break;
 1369                 }
 1370 
 1371                 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
 1372                         switch (isr->saidx.dst.sa.sa_family) {
 1373                         case AF_INET:
 1374                                 clen += sizeof(struct ip);
 1375                                 break;
 1376 #ifdef INET6
 1377                         case AF_INET6:
 1378                                 clen += sizeof(struct ip6_hdr);
 1379                                 break;
 1380 #endif
 1381                         default:
 1382                                 ipseclog((LOG_ERR, "%s: unknown AF %d in "
 1383                                     "IPsec tunnel SA\n", __func__,
 1384                                     ((struct sockaddr *)&isr->saidx.dst)->sa_family));
 1385                                 break;
 1386                         }
 1387                 }
 1388                 size += clen;
 1389         }
 1390 
 1391         return (size);
 1392 }
 1393 
 1394 /* 
 1395  * This function is called from ipsec_hdrsiz_tcp(), ip_ipsec_mtu(),
 1396  * disabled ip6_ipsec_mtu() and ip6_forward().
 1397  */
 1398 size_t
 1399 ipsec_hdrsiz(struct mbuf *m, u_int dir, struct inpcb *inp)
 1400 {
 1401         struct secpolicy *sp;
 1402         int error;
 1403         size_t size;
 1404 
 1405         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 1406 
 1407         /* Get SP for this packet.
 1408          * When we are called from ip_forward(), we call
 1409          * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
 1410          */
 1411         if (inp == NULL)
 1412                 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
 1413         else
 1414                 sp = ipsec_getpolicybysock(m, dir, inp, &error);
 1415 
 1416         if (sp != NULL) {
 1417                 size = ipsec_hdrsiz_internal(sp);
 1418                 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
 1419                         printf("%s: size:%lu.\n", __func__,
 1420                                 (unsigned long)size));
 1421 
 1422                 KEY_FREESP(&sp);
 1423         } else {
 1424                 size = 0;       /* XXX Should be panic?
 1425                                  * -> No, we are called w/o knowing if
 1426                                  *    IPsec processing is needed. */
 1427         }
 1428         return (size);
 1429 }
 1430 
 1431 /*
 1432  * Check the variable replay window.
 1433  * ipsec_chkreplay() performs replay check before ICV verification.
 1434  * ipsec_updatereplay() updates replay bitmap.  This must be called after
 1435  * ICV verification (it also performs replay check, which is usually done
 1436  * beforehand).
 1437  * 0 (zero) is returned if packet disallowed, 1 if packet permitted.
 1438  *
 1439  * Based on RFC 2401.
 1440  */
 1441 int
 1442 ipsec_chkreplay(u_int32_t seq, struct secasvar *sav)
 1443 {
 1444         const struct secreplay *replay;
 1445         u_int32_t diff;
 1446         int fr;
 1447         u_int32_t wsizeb;       /* Constant: bits of window size. */
 1448         int frlast;             /* Constant: last frame. */
 1449 
 1450         IPSEC_ASSERT(sav != NULL, ("Null SA"));
 1451         IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
 1452 
 1453         replay = sav->replay;
 1454 
 1455         if (replay->wsize == 0)
 1456                 return (1);     /* No need to check replay. */
 1457 
 1458         /* Constant. */
 1459         frlast = replay->wsize - 1;
 1460         wsizeb = replay->wsize << 3;
 1461 
 1462         /* Sequence number of 0 is invalid. */
 1463         if (seq == 0)
 1464                 return (0);
 1465 
 1466         /* First time is always okay. */
 1467         if (replay->count == 0)
 1468                 return (1);
 1469 
 1470         if (seq > replay->lastseq) {
 1471                 /* Larger sequences are okay. */
 1472                 return (1);
 1473         } else {
 1474                 /* seq is equal or less than lastseq. */
 1475                 diff = replay->lastseq - seq;
 1476 
 1477                 /* Over range to check, i.e. too old or wrapped. */
 1478                 if (diff >= wsizeb)
 1479                         return (0);
 1480 
 1481                 fr = frlast - diff / 8;
 1482 
 1483                 /* This packet already seen? */
 1484                 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
 1485                         return (0);
 1486 
 1487                 /* Out of order but good. */
 1488                 return (1);
 1489         }
 1490 }
 1491 
 1492 /*
 1493  * Check replay counter whether to update or not.
 1494  * OUT: 0:      OK
 1495  *      1:      NG
 1496  */
 1497 int
 1498 ipsec_updatereplay(u_int32_t seq, struct secasvar *sav)
 1499 {
 1500         struct secreplay *replay;
 1501         u_int32_t diff;
 1502         int fr;
 1503         u_int32_t wsizeb;       /* Constant: bits of window size. */
 1504         int frlast;             /* Constant: last frame. */
 1505 
 1506         IPSEC_ASSERT(sav != NULL, ("Null SA"));
 1507         IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
 1508 
 1509         replay = sav->replay;
 1510 
 1511         if (replay->wsize == 0)
 1512                 goto ok;        /* No need to check replay. */
 1513 
 1514         /* Constant. */
 1515         frlast = replay->wsize - 1;
 1516         wsizeb = replay->wsize << 3;
 1517 
 1518         /* Sequence number of 0 is invalid. */
 1519         if (seq == 0)
 1520                 return (1);
 1521 
 1522         /* First time. */
 1523         if (replay->count == 0) {
 1524                 replay->lastseq = seq;
 1525                 bzero(replay->bitmap, replay->wsize);
 1526                 (replay->bitmap)[frlast] = 1;
 1527                 goto ok;
 1528         }
 1529 
 1530         if (seq > replay->lastseq) {
 1531                 /* seq is larger than lastseq. */
 1532                 diff = seq - replay->lastseq;
 1533 
 1534                 /* New larger sequence number. */
 1535                 if (diff < wsizeb) {
 1536                         /* In window. */
 1537                         /* Set bit for this packet. */
 1538                         vshiftl(replay->bitmap, diff, replay->wsize);
 1539                         (replay->bitmap)[frlast] |= 1;
 1540                 } else {
 1541                         /* This packet has a "way larger". */
 1542                         bzero(replay->bitmap, replay->wsize);
 1543                         (replay->bitmap)[frlast] = 1;
 1544                 }
 1545                 replay->lastseq = seq;
 1546 
 1547                 /* Larger is good. */
 1548         } else {
 1549                 /* seq is equal or less than lastseq. */
 1550                 diff = replay->lastseq - seq;
 1551 
 1552                 /* Over range to check, i.e. too old or wrapped. */
 1553                 if (diff >= wsizeb)
 1554                         return (1);
 1555 
 1556                 fr = frlast - diff / 8;
 1557 
 1558                 /* This packet already seen? */
 1559                 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
 1560                         return (1);
 1561 
 1562                 /* Mark as seen. */
 1563                 (replay->bitmap)[fr] |= (1 << (diff % 8));
 1564 
 1565                 /* Out of order but good. */
 1566         }
 1567 
 1568 ok:
 1569         if (replay->count == ~0) {
 1570 
 1571                 /* Set overflow flag. */
 1572                 replay->overflow++;
 1573 
 1574                 /* Don't increment, no more packets accepted. */
 1575                 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
 1576                         return (1);
 1577 
 1578                 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n",
 1579                     __func__, replay->overflow, ipsec_logsastr(sav)));
 1580         }
 1581 
 1582         replay->count++;
 1583 
 1584         return (0);
 1585 }
 1586 
 1587 /*
 1588  * Shift variable length buffer to left.
 1589  * IN:  bitmap: pointer to the buffer
 1590  *      nbit:   the number of to shift.
 1591  *      wsize:  buffer size (bytes).
 1592  */
 1593 static void
 1594 vshiftl(unsigned char *bitmap, int nbit, int wsize)
 1595 {
 1596         int s, j, i;
 1597         unsigned char over;
 1598 
 1599         for (j = 0; j < nbit; j += 8) {
 1600                 s = (nbit - j < 8) ? (nbit - j): 8;
 1601                 bitmap[0] <<= s;
 1602                 for (i = 1; i < wsize; i++) {
 1603                         over = (bitmap[i] >> (8 - s));
 1604                         bitmap[i] <<= s;
 1605                         bitmap[i-1] |= over;
 1606                 }
 1607         }
 1608 }
 1609 
 1610 #ifdef INET
 1611 /* Return a printable string for the IPv4 address. */
 1612 static char *
 1613 inet_ntoa4(struct in_addr ina)
 1614 {
 1615         static char buf[4][4 * sizeof "123" + 4];
 1616         unsigned char *ucp = (unsigned char *) &ina;
 1617         static int i = 3;
 1618 
 1619         /* XXX-BZ Returns static buffer. */
 1620         i = (i + 1) % 4;
 1621         sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff,
 1622             ucp[2] & 0xff, ucp[3] & 0xff);
 1623         return (buf[i]);
 1624 }
 1625 #endif
 1626 
 1627 /* Return a printable string for the address. */
 1628 char *
 1629 ipsec_address(union sockaddr_union* sa)
 1630 {
 1631 #ifdef INET6
 1632         char ip6buf[INET6_ADDRSTRLEN];
 1633 #endif
 1634 
 1635         switch (sa->sa.sa_family) {
 1636 #ifdef INET
 1637         case AF_INET:
 1638                 return (inet_ntoa4(sa->sin.sin_addr));
 1639 #endif /* INET */
 1640 #ifdef INET6
 1641         case AF_INET6:
 1642                 return (ip6_sprintf(ip6buf, &sa->sin6.sin6_addr));
 1643 #endif /* INET6 */
 1644         default:
 1645                 return ("(unknown address family)");
 1646         }
 1647 }
 1648 
 1649 const char *
 1650 ipsec_logsastr(struct secasvar *sav)
 1651 {
 1652         static char buf[256];
 1653         char *p;
 1654         struct secasindex *saidx = &sav->sah->saidx;
 1655 
 1656         IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
 1657                 ("address family mismatch"));
 1658 
 1659         p = buf;
 1660         snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
 1661         while (p && *p)
 1662                 p++;
 1663         /* NB: only use ipsec_address on one address at a time. */
 1664         snprintf(p, sizeof (buf) - (p - buf), "src=%s ",
 1665                 ipsec_address(&saidx->src));
 1666         while (p && *p)
 1667                 p++;
 1668         snprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
 1669                 ipsec_address(&saidx->dst));
 1670 
 1671         return (buf);
 1672 }
 1673 
 1674 void
 1675 ipsec_dumpmbuf(struct mbuf *m)
 1676 {
 1677         int totlen;
 1678         int i;
 1679         u_char *p;
 1680 
 1681         totlen = 0;
 1682         printf("---\n");
 1683         while (m) {
 1684                 p = mtod(m, u_char *);
 1685                 for (i = 0; i < m->m_len; i++) {
 1686                         printf("%02x ", p[i]);
 1687                         totlen++;
 1688                         if (totlen % 16 == 0)
 1689                                 printf("\n");
 1690                 }
 1691                 m = m->m_next;
 1692         }
 1693         if (totlen % 16 != 0)
 1694                 printf("\n");
 1695         printf("---\n");
 1696 }
 1697 
 1698 static void
 1699 ipsec_init(const void *unused __unused)
 1700 {
 1701 
 1702         SECPOLICY_LOCK_INIT(&V_ip4_def_policy);
 1703         V_ip4_def_policy.refcnt = 1;                    /* NB: disallow free. */
 1704 }
 1705 VNET_SYSINIT(ipsec_init, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY, ipsec_init,
 1706     NULL);
 1707 
 1708 
 1709 /* XXX This stuff doesn't belong here... */
 1710 
 1711 static  struct xformsw* xforms = NULL;
 1712 
 1713 /*
 1714  * Register a transform; typically at system startup.
 1715  */
 1716 void
 1717 xform_register(struct xformsw* xsp)
 1718 {
 1719 
 1720         xsp->xf_next = xforms;
 1721         xforms = xsp;
 1722 }
 1723 
 1724 /*
 1725  * Initialize transform support in an sav.
 1726  */
 1727 int
 1728 xform_init(struct secasvar *sav, int xftype)
 1729 {
 1730         struct xformsw *xsp;
 1731 
 1732         if (sav->tdb_xform != NULL)     /* Previously initialized. */
 1733                 return (0);
 1734         for (xsp = xforms; xsp; xsp = xsp->xf_next)
 1735                 if (xsp->xf_type == xftype)
 1736                         return ((*xsp->xf_init)(sav, xsp));
 1737         return (EINVAL);
 1738 }

Cache object: 4f6736f45fcec0be349c1e164ba980f9


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