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/4/sys/netipsec/ipsec.c 117092 2003-07-01 01:38:13Z sam $       */
    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/protosw.h>
   47 #include <sys/socket.h>
   48 #include <sys/socketvar.h>
   49 #include <sys/errno.h>
   50 #include <sys/time.h>
   51 #include <sys/kernel.h>
   52 #include <sys/syslog.h>
   53 #include <sys/sysctl.h>
   54 #include <sys/proc.h>
   55 
   56 #include <net/if.h>
   57 #include <net/route.h>
   58 
   59 #include <netinet/in.h>
   60 #include <netinet/in_systm.h>
   61 #include <netinet/ip.h>
   62 #include <netinet/ip_var.h>
   63 #include <netinet/in_var.h>
   64 #include <netinet/udp.h>
   65 #include <netinet/udp_var.h>
   66 #include <netinet/tcp.h>
   67 #include <netinet/udp.h>
   68 
   69 #include <netinet/ip6.h>
   70 #ifdef INET6
   71 #include <netinet6/ip6_var.h>
   72 #endif
   73 #include <netinet/in_pcb.h>
   74 #ifdef INET6
   75 #include <netinet/icmp6.h>
   76 #endif
   77 
   78 #include <netipsec/ipsec.h>
   79 #ifdef INET6
   80 #include <netipsec/ipsec6.h>
   81 #endif
   82 #include <netipsec/ah_var.h>
   83 #include <netipsec/esp_var.h>
   84 #include <netipsec/ipcomp.h>            /*XXX*/
   85 #include <netipsec/ipcomp_var.h>
   86 
   87 #include <netipsec/key.h>
   88 #include <netipsec/keydb.h>
   89 #include <netipsec/key_debug.h>
   90 
   91 #include <netipsec/xform.h>
   92 
   93 #include <machine/in_cksum.h>
   94 
   95 #include <net/net_osdep.h>
   96 
   97 #ifdef IPSEC_DEBUG
   98 int ipsec_debug = 1;
   99 #else
  100 int ipsec_debug = 0;
  101 #endif
  102 
  103 /* NB: name changed so netstat doesn't use it */
  104 struct newipsecstat newipsecstat;
  105 int ip4_ah_offsetmask = 0;      /* maybe IP_DF? */
  106 int ip4_ipsec_dfbit = 0;        /* DF bit on encap. 0: clear 1: set 2: copy */
  107 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE;
  108 int ip4_esp_net_deflev = IPSEC_LEVEL_USE;
  109 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE;
  110 int ip4_ah_net_deflev = IPSEC_LEVEL_USE;
  111 struct secpolicy ip4_def_policy;
  112 int ip4_ipsec_ecn = 0;          /* ECN ignore(-1)/forbidden(0)/allowed(1) */
  113 int ip4_esp_randpad = -1;
  114 /*
  115  * Crypto support requirements:
  116  *
  117  *  1   require hardware support
  118  * -1   require software support
  119  *  0   take anything
  120  */
  121 int     crypto_support = 0;
  122 
  123 SYSCTL_DECL(_net_inet_ipsec);
  124 
  125 /* net.inet.ipsec */
  126 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY,
  127         def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
  128 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
  129         CTLFLAG_RW, &ip4_esp_trans_deflev,      0, "");
  130 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
  131         CTLFLAG_RW, &ip4_esp_net_deflev,        0, "");
  132 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
  133         CTLFLAG_RW, &ip4_ah_trans_deflev,       0, "");
  134 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
  135         CTLFLAG_RW, &ip4_ah_net_deflev, 0, "");
  136 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS,
  137         ah_cleartos, CTLFLAG_RW,        &ah_cleartos,   0, "");
  138 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK,
  139         ah_offsetmask, CTLFLAG_RW,      &ip4_ah_offsetmask,     0, "");
  140 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT,
  141         dfbit, CTLFLAG_RW,      &ip4_ipsec_dfbit,       0, "");
  142 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN,
  143         ecn, CTLFLAG_RW,        &ip4_ipsec_ecn, 0, "");
  144 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG,
  145         debug, CTLFLAG_RW,      &ipsec_debug,   0, "");
  146 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD,
  147         esp_randpad, CTLFLAG_RW,        &ip4_esp_randpad,       0, "");
  148 SYSCTL_INT(_net_inet_ipsec, OID_AUTO,
  149         crypto_support, CTLFLAG_RW,     &crypto_support,0, "");
  150 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO,
  151         ipsecstats,     CTLFLAG_RD,     &newipsecstat,  newipsecstat, "");
  152 
  153 #ifdef INET6
  154 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE;
  155 int ip6_esp_net_deflev = IPSEC_LEVEL_USE;
  156 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
  157 int ip6_ah_net_deflev = IPSEC_LEVEL_USE;
  158 int ip6_ipsec_ecn = 0;          /* ECN ignore(-1)/forbidden(0)/allowed(1) */
  159 int ip6_esp_randpad = -1;
  160 
  161 SYSCTL_DECL(_net_inet6_ipsec6);
  162 
  163 /* net.inet6.ipsec6 */
  164 #ifdef COMPAT_KAME
  165 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD,
  166         0,0, compat_ipsecstats_sysctl, "S", "");
  167 #endif /* COMPAT_KAME */
  168 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
  169         def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
  170 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
  171         CTLFLAG_RW, &ip6_esp_trans_deflev,      0, "");
  172 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
  173         CTLFLAG_RW, &ip6_esp_net_deflev,        0, "");
  174 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
  175         CTLFLAG_RW, &ip6_ah_trans_deflev,       0, "");
  176 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
  177         CTLFLAG_RW, &ip6_ah_net_deflev, 0, "");
  178 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
  179         ecn, CTLFLAG_RW,        &ip6_ipsec_ecn, 0, "");
  180 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG,
  181         debug, CTLFLAG_RW,      &ipsec_debug,   0, "");
  182 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD,
  183         esp_randpad, CTLFLAG_RW,        &ip6_esp_randpad,       0, "");
  184 #endif /* INET6 */
  185 
  186 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb));
  187 #ifdef INET6
  188 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb));
  189 #endif
  190 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int));
  191 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
  192 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
  193 #ifdef INET6
  194 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
  195 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
  196 #endif
  197 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *));
  198 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src));
  199 static int ipsec_set_policy __P((struct secpolicy **pcb_sp,
  200         int optname, caddr_t request, size_t len, int priv));
  201 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp));
  202 static void vshiftl __P((unsigned char *, int, int));
  203 static size_t ipsec_hdrsiz __P((struct secpolicy *));
  204 
  205 /*
  206  * Return a held reference to the default SP.
  207  */
  208 static struct secpolicy *
  209 key_allocsp_default(const char* where, int tag)
  210 {
  211         struct secpolicy *sp;
  212 
  213         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
  214                 printf("DP key_allocsp_default from %s:%u\n", where, tag));
  215 
  216         sp = &ip4_def_policy;
  217         if (sp->policy != IPSEC_POLICY_DISCARD &&
  218             sp->policy != IPSEC_POLICY_NONE) {
  219                 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n",
  220                     sp->policy, IPSEC_POLICY_NONE));
  221                 sp->policy = IPSEC_POLICY_NONE;
  222         }
  223         sp->refcnt++;
  224 
  225         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
  226                 printf("DP key_allocsp_default returns SP:%p (%u)\n",
  227                         sp, sp->refcnt));
  228         return sp;
  229 }
  230 #define KEY_ALLOCSP_DEFAULT() \
  231         key_allocsp_default(__FILE__, __LINE__)
  232 
  233 /*
  234  * For OUTBOUND packet having a socket. Searching SPD for packet,
  235  * and return a pointer to SP.
  236  * OUT: NULL:   no apropreate SP found, the following value is set to error.
  237  *              0       : bypass
  238  *              EACCES  : discard packet.
  239  *              ENOENT  : ipsec_acquire() in progress, maybe.
  240  *              others  : error occured.
  241  *      others: a pointer to SP
  242  *
  243  * NOTE: IPv6 mapped adddress concern is implemented here.
  244  */
  245 struct secpolicy *
  246 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir)
  247 {
  248         struct secpolicy *sp;
  249 
  250         KASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi"));
  251         KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
  252                 ("ipsec_getpolicy: invalid direction %u", dir));
  253 
  254         sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir);
  255         if (sp == NULL)                 /*XXX????*/
  256                 sp = KEY_ALLOCSP_DEFAULT();
  257         KASSERT(sp != NULL, ("ipsec_getpolicy: null SP"));
  258         return sp;
  259 }
  260 
  261 /*
  262  * For OUTBOUND packet having a socket. Searching SPD for packet,
  263  * and return a pointer to SP.
  264  * OUT: NULL:   no apropreate SP found, the following value is set to error.
  265  *              0       : bypass
  266  *              EACCES  : discard packet.
  267  *              ENOENT  : ipsec_acquire() in progress, maybe.
  268  *              others  : error occured.
  269  *      others: a pointer to SP
  270  *
  271  * NOTE: IPv6 mapped adddress concern is implemented here.
  272  */
  273 struct secpolicy *
  274 ipsec_getpolicybysock(m, dir, inp, error)
  275         struct mbuf *m;
  276         u_int dir;
  277         struct inpcb *inp;
  278         int *error;
  279 {
  280         struct inpcbpolicy *pcbsp = NULL;
  281         struct secpolicy *currsp = NULL;        /* policy on socket */
  282         struct secpolicy *sp;
  283         int af;
  284 
  285         KASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf"));
  286         KASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb"));
  287         KASSERT(error != NULL, ("ipsec_getpolicybysock: null error"));
  288         KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
  289                 ("ipsec_getpolicybysock: invalid direction %u", dir));
  290 
  291         af = inp->inp_socket->so_proto->pr_domain->dom_family;
  292         KASSERT(af == AF_INET || af == AF_INET6,
  293                 ("ipsec_getpolicybysock: unexpected protocol family %u", af));
  294 
  295         switch (af) {
  296         case AF_INET:
  297                 /* set spidx in pcb */
  298                 *error = ipsec4_setspidx_inpcb(m, inp);
  299                 pcbsp = inp->inp_sp;
  300                 break;
  301 #ifdef INET6
  302         case AF_INET6:
  303                 /* set spidx in pcb */
  304                 *error = ipsec6_setspidx_in6pcb(m, inp);
  305                 pcbsp = inp->in6p_sp;
  306                 break;
  307 #endif
  308         default:
  309                 *error = EPFNOSUPPORT;
  310                 break;
  311         }
  312         if (*error)
  313                 return NULL;
  314 
  315         KASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp"));
  316         switch (dir) {
  317         case IPSEC_DIR_INBOUND:
  318                 currsp = pcbsp->sp_in;
  319                 break;
  320         case IPSEC_DIR_OUTBOUND:
  321                 currsp = pcbsp->sp_out;
  322                 break;
  323         }
  324         KASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp"));
  325 
  326         if (pcbsp->priv) {                      /* when privilieged socket */
  327                 switch (currsp->policy) {
  328                 case IPSEC_POLICY_BYPASS:
  329                 case IPSEC_POLICY_IPSEC:
  330                         currsp->refcnt++;
  331                         sp = currsp;
  332                         break;
  333 
  334                 case IPSEC_POLICY_ENTRUST:
  335                         /* look for a policy in SPD */
  336                         sp = KEY_ALLOCSP(&currsp->spidx, dir);
  337                         if (sp == NULL)         /* no SP found */
  338                                 sp = KEY_ALLOCSP_DEFAULT();
  339                         break;
  340 
  341                 default:
  342                         ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
  343                               "Invalid policy for PCB %d\n", currsp->policy));
  344                         *error = EINVAL;
  345                         return NULL;
  346                 }
  347         } else {                                /* unpriv, SPD has policy */
  348                 sp = KEY_ALLOCSP(&currsp->spidx, dir);
  349                 if (sp == NULL) {               /* no SP found */
  350                         switch (currsp->policy) {
  351                         case IPSEC_POLICY_BYPASS:
  352                                 ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
  353                                        "Illegal policy for non-priviliged defined %d\n",
  354                                         currsp->policy));
  355                                 *error = EINVAL;
  356                                 return NULL;
  357 
  358                         case IPSEC_POLICY_ENTRUST:
  359                                 sp = KEY_ALLOCSP_DEFAULT();
  360                                 break;
  361 
  362                         case IPSEC_POLICY_IPSEC:
  363                                 currsp->refcnt++;
  364                                 sp = currsp;
  365                                 break;
  366 
  367                         default:
  368                                 ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
  369                                    "Invalid policy for PCB %d\n", currsp->policy));
  370                                 *error = EINVAL;
  371                                 return NULL;
  372                         }
  373                 }
  374         }
  375         KASSERT(sp != NULL,
  376                 ("ipsec_getpolicybysock: null SP (priv %u policy %u",
  377                  pcbsp->priv, currsp->policy));
  378         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
  379                 printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates "
  380                        "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy,
  381                        sp, sp->refcnt));
  382         return sp;
  383 }
  384 
  385 /*
  386  * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
  387  * and return a pointer to SP.
  388  * OUT: positive: a pointer to the entry for security policy leaf matched.
  389  *      NULL:   no apropreate SP found, the following value is set to error.
  390  *              0       : bypass
  391  *              EACCES  : discard packet.
  392  *              ENOENT  : ipsec_acquire() in progress, maybe.
  393  *              others  : error occured.
  394  */
  395 struct secpolicy *
  396 ipsec_getpolicybyaddr(m, dir, flag, error)
  397         struct mbuf *m;
  398         u_int dir;
  399         int flag;
  400         int *error;
  401 {
  402         struct secpolicyindex spidx;
  403         struct secpolicy *sp;
  404 
  405         KASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf"));
  406         KASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error"));
  407         KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
  408                 ("ipsec4_getpolicybaddr: invalid direction %u", dir));
  409 
  410         sp = NULL;
  411         if (key_havesp(dir)) {
  412                 /* Make an index to look for a policy. */
  413                 *error = ipsec_setspidx(m, &spidx,
  414                                         (flag & IP_FORWARDING) ? 0 : 1);
  415                 if (*error != 0) {
  416                         DPRINTF(("ipsec_getpolicybyaddr: setpidx failed,"
  417                                 " dir %u flag %u\n", dir, flag));
  418                         bzero(&spidx, sizeof (spidx));
  419                         return NULL;
  420                 }
  421                 spidx.dir = dir;
  422 
  423                 sp = KEY_ALLOCSP(&spidx, dir);
  424         }
  425         if (sp == NULL)                 /* no SP found, use system default */
  426                 sp = KEY_ALLOCSP_DEFAULT();
  427         KASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP"));
  428         return sp;
  429 }
  430 
  431 struct secpolicy *
  432 ipsec4_checkpolicy(m, dir, flag, error, inp)
  433         struct mbuf *m;
  434         u_int dir, flag;
  435         int *error;
  436         struct inpcb *inp;
  437 {
  438         struct secpolicy *sp;
  439 
  440         *error = 0;
  441         if (inp == NULL)
  442                 sp = ipsec_getpolicybyaddr(m, dir, flag, error);
  443         else
  444                 sp = ipsec_getpolicybysock(m, dir, inp, error);
  445         if (sp == NULL) {
  446                 KASSERT(*error != 0,
  447                         ("ipsec4_checkpolicy: getpolicy failed w/o error"));
  448                 newipsecstat.ips_out_inval++;
  449                 return NULL;
  450         }
  451         KASSERT(*error == 0,
  452                 ("ipsec4_checkpolicy: sp w/ error set to %u", *error));
  453         switch (sp->policy) {
  454         case IPSEC_POLICY_ENTRUST:
  455         default:
  456                 printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy);
  457                 /* fall thru... */
  458         case IPSEC_POLICY_DISCARD:
  459                 newipsecstat.ips_out_polvio++;
  460                 *error = -EINVAL;       /* packet is discarded by caller */
  461                 break;
  462         case IPSEC_POLICY_BYPASS:
  463         case IPSEC_POLICY_NONE:
  464                 KEY_FREESP(&sp);
  465                 sp = NULL;              /* NB: force NULL result */
  466                 break;
  467         case IPSEC_POLICY_IPSEC:
  468                 if (sp->req == NULL)    /* acquire an SA */
  469                         *error = key_spdacquire(sp);
  470                 break;
  471         }
  472         if (*error != 0) {
  473                 KEY_FREESP(&sp);
  474                 sp = NULL;
  475         }
  476         return sp;
  477 }
  478 
  479 static int
  480 ipsec4_setspidx_inpcb(m, pcb)
  481         struct mbuf *m;
  482         struct inpcb *pcb;
  483 {
  484         int error;
  485 
  486         KASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb"));
  487         KASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp"));
  488         KASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
  489                 ("ipsec4_setspidx_inpcb: null sp_in || sp_out"));
  490 
  491         error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
  492         if (error == 0) {
  493                 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
  494                 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
  495                 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
  496         } else {
  497                 bzero(&pcb->inp_sp->sp_in->spidx,
  498                         sizeof (pcb->inp_sp->sp_in->spidx));
  499                 bzero(&pcb->inp_sp->sp_out->spidx,
  500                         sizeof (pcb->inp_sp->sp_in->spidx));
  501         }
  502         return error;
  503 }
  504 
  505 #ifdef INET6
  506 static int
  507 ipsec6_setspidx_in6pcb(m, pcb)
  508         struct mbuf *m;
  509         struct in6pcb *pcb;
  510 {
  511         struct secpolicyindex *spidx;
  512         int error;
  513 
  514         KASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb"));
  515         KASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp"));
  516         KASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL,
  517                 ("ipsec6_setspidx_in6pcb: null sp_in || sp_out"));
  518 
  519         bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
  520         bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
  521 
  522         spidx = &pcb->in6p_sp->sp_in->spidx;
  523         error = ipsec_setspidx(m, spidx, 1);
  524         if (error)
  525                 goto bad;
  526         spidx->dir = IPSEC_DIR_INBOUND;
  527 
  528         spidx = &pcb->in6p_sp->sp_out->spidx;
  529         error = ipsec_setspidx(m, spidx, 1);
  530         if (error)
  531                 goto bad;
  532         spidx->dir = IPSEC_DIR_OUTBOUND;
  533 
  534         return 0;
  535 
  536 bad:
  537         bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
  538         bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
  539         return error;
  540 }
  541 #endif
  542 
  543 /*
  544  * configure security policy index (src/dst/proto/sport/dport)
  545  * by looking at the content of mbuf.
  546  * the caller is responsible for error recovery (like clearing up spidx).
  547  */
  548 static int
  549 ipsec_setspidx(m, spidx, needport)
  550         struct mbuf *m;
  551         struct secpolicyindex *spidx;
  552         int needport;
  553 {
  554         struct ip *ip = NULL;
  555         struct ip ipbuf;
  556         u_int v;
  557         struct mbuf *n;
  558         int len;
  559         int error;
  560 
  561         KASSERT(m != NULL, ("ipsec_setspidx: null mbuf"));
  562 
  563         /*
  564          * validate m->m_pkthdr.len.  we see incorrect length if we
  565          * mistakenly call this function with inconsistent mbuf chain
  566          * (like 4.4BSD tcp/udp processing).  XXX should we panic here?
  567          */
  568         len = 0;
  569         for (n = m; n; n = n->m_next)
  570                 len += n->m_len;
  571         if (m->m_pkthdr.len != len) {
  572                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
  573                         printf("ipsec_setspidx: "
  574                                "total of m_len(%d) != pkthdr.len(%d), "
  575                                "ignored.\n",
  576                                 len, m->m_pkthdr.len));
  577                 return EINVAL;
  578         }
  579 
  580         if (m->m_pkthdr.len < sizeof(struct ip)) {
  581                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
  582                         printf("ipsec_setspidx: "
  583                             "pkthdr.len(%d) < sizeof(struct ip), ignored.\n",
  584                             m->m_pkthdr.len));
  585                 return EINVAL;
  586         }
  587 
  588         if (m->m_len >= sizeof(*ip))
  589                 ip = mtod(m, struct ip *);
  590         else {
  591                 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
  592                 ip = &ipbuf;
  593         }
  594 #ifdef _IP_VHL
  595         v = _IP_VHL_V(ip->ip_vhl);
  596 #else
  597         v = ip->ip_v;
  598 #endif
  599         switch (v) {
  600         case 4:
  601                 error = ipsec4_setspidx_ipaddr(m, spidx);
  602                 if (error)
  603                         return error;
  604                 ipsec4_get_ulp(m, spidx, needport);
  605                 return 0;
  606 #ifdef INET6
  607         case 6:
  608                 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
  609                         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
  610                                 printf("ipsec_setspidx: "
  611                                     "pkthdr.len(%d) < sizeof(struct ip6_hdr), "
  612                                     "ignored.\n", m->m_pkthdr.len));
  613                         return EINVAL;
  614                 }
  615                 error = ipsec6_setspidx_ipaddr(m, spidx);
  616                 if (error)
  617                         return error;
  618                 ipsec6_get_ulp(m, spidx, needport);
  619                 return 0;
  620 #endif
  621         default:
  622                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
  623                         printf("ipsec_setspidx: "
  624                             "unknown IP version %u, ignored.\n", v));
  625                 return EINVAL;
  626         }
  627 }
  628 
  629 static void
  630 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
  631 {
  632         u_int8_t nxt;
  633         int off;
  634 
  635         /* sanity check */
  636         KASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf"));
  637         KASSERT(m->m_pkthdr.len >= sizeof(struct ip),
  638                 ("ipsec4_get_ulp: packet too short"));
  639 
  640         /* NB: ip_input() flips it into host endian XXX need more checking */
  641         if (m->m_len < sizeof (struct ip)) {
  642                 struct ip *ip = mtod(m, struct ip *);
  643                 if (ip->ip_off & (IP_MF | IP_OFFMASK))
  644                         goto done;
  645 #ifdef _IP_VHL
  646                 off = _IP_VHL_HL(ip->ip_vhl) << 2;
  647 #else
  648                 off = ip->ip_hl << 2;
  649 #endif
  650                 nxt = ip->ip_p;
  651         } else {
  652                 struct ip ih;
  653 
  654                 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih);
  655                 if (ih.ip_off & (IP_MF | IP_OFFMASK))
  656                         goto done;
  657 #ifdef _IP_VHL
  658                 off = _IP_VHL_HL(ih.ip_vhl) << 2;
  659 #else
  660                 off = ih.ip_hl << 2;
  661 #endif
  662                 nxt = ih.ip_p;
  663         }
  664 
  665         while (off < m->m_pkthdr.len) {
  666                 struct ip6_ext ip6e;
  667                 struct tcphdr th;
  668                 struct udphdr uh;
  669 
  670                 switch (nxt) {
  671                 case IPPROTO_TCP:
  672                         spidx->ul_proto = nxt;
  673                         if (!needport)
  674                                 goto done_proto;
  675                         if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
  676                                 goto done;
  677                         m_copydata(m, off, sizeof (th), (caddr_t) &th);
  678                         spidx->src.sin.sin_port = th.th_sport;
  679                         spidx->dst.sin.sin_port = th.th_dport;
  680                         return;
  681                 case IPPROTO_UDP:
  682                         spidx->ul_proto = nxt;
  683                         if (!needport)
  684                                 goto done_proto;
  685                         if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
  686                                 goto done;
  687                         m_copydata(m, off, sizeof (uh), (caddr_t) &uh);
  688                         spidx->src.sin.sin_port = uh.uh_sport;
  689                         spidx->dst.sin.sin_port = uh.uh_dport;
  690                         return;
  691                 case IPPROTO_AH:
  692                         if (m->m_pkthdr.len > off + sizeof(ip6e))
  693                                 goto done;
  694                         /* XXX sigh, this works but is totally bogus */
  695                         m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e);
  696                         off += (ip6e.ip6e_len + 2) << 2;
  697                         nxt = ip6e.ip6e_nxt;
  698                         break;
  699                 case IPPROTO_ICMP:
  700                 default:
  701                         /* XXX intermediate headers??? */
  702                         spidx->ul_proto = nxt;
  703                         goto done_proto;
  704                 }
  705         }
  706 done:
  707         spidx->ul_proto = IPSEC_ULPROTO_ANY;
  708 done_proto:
  709         spidx->src.sin.sin_port = IPSEC_PORT_ANY;
  710         spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
  711 }
  712 
  713 /* assumes that m is sane */
  714 static int
  715 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
  716 {
  717         static const struct sockaddr_in template = {
  718                 sizeof (struct sockaddr_in),
  719                 AF_INET,
  720                 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
  721         };
  722 
  723         spidx->src.sin = template;
  724         spidx->dst.sin = template;
  725 
  726         if (m->m_len < sizeof (struct ip)) {
  727                 m_copydata(m, offsetof(struct ip, ip_src),
  728                            sizeof (struct  in_addr),
  729                            (caddr_t) &spidx->src.sin.sin_addr);
  730                 m_copydata(m, offsetof(struct ip, ip_dst),
  731                            sizeof (struct  in_addr),
  732                            (caddr_t) &spidx->dst.sin.sin_addr);
  733         } else {
  734                 struct ip *ip = mtod(m, struct ip *);
  735                 spidx->src.sin.sin_addr = ip->ip_src;
  736                 spidx->dst.sin.sin_addr = ip->ip_dst;
  737         }
  738 
  739         spidx->prefs = sizeof(struct in_addr) << 3;
  740         spidx->prefd = sizeof(struct in_addr) << 3;
  741 
  742         return 0;
  743 }
  744 
  745 #ifdef INET6
  746 static void
  747 ipsec6_get_ulp(m, spidx, needport)
  748         struct mbuf *m;
  749         struct secpolicyindex *spidx;
  750         int needport;
  751 {
  752         int off, nxt;
  753         struct tcphdr th;
  754         struct udphdr uh;
  755 
  756         /* sanity check */
  757         if (m == NULL)
  758                 panic("ipsec6_get_ulp: NULL pointer was passed.\n");
  759 
  760         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
  761                 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m));
  762 
  763         /* set default */
  764         spidx->ul_proto = IPSEC_ULPROTO_ANY;
  765         ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
  766         ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
  767 
  768         nxt = -1;
  769         off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
  770         if (off < 0 || m->m_pkthdr.len < off)
  771                 return;
  772 
  773         switch (nxt) {
  774         case IPPROTO_TCP:
  775                 spidx->ul_proto = nxt;
  776                 if (!needport)
  777                         break;
  778                 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
  779                         break;
  780                 m_copydata(m, off, sizeof(th), (caddr_t)&th);
  781                 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
  782                 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
  783                 break;
  784         case IPPROTO_UDP:
  785                 spidx->ul_proto = nxt;
  786                 if (!needport)
  787                         break;
  788                 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
  789                         break;
  790                 m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
  791                 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
  792                 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
  793                 break;
  794         case IPPROTO_ICMPV6:
  795         default:
  796                 /* XXX intermediate headers??? */
  797                 spidx->ul_proto = nxt;
  798                 break;
  799         }
  800 }
  801 
  802 /* assumes that m is sane */
  803 static int
  804 ipsec6_setspidx_ipaddr(m, spidx)
  805         struct mbuf *m;
  806         struct secpolicyindex *spidx;
  807 {
  808         struct ip6_hdr *ip6 = NULL;
  809         struct ip6_hdr ip6buf;
  810         struct sockaddr_in6 *sin6;
  811 
  812         if (m->m_len >= sizeof(*ip6))
  813                 ip6 = mtod(m, struct ip6_hdr *);
  814         else {
  815                 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
  816                 ip6 = &ip6buf;
  817         }
  818 
  819         sin6 = (struct sockaddr_in6 *)&spidx->src;
  820         bzero(sin6, sizeof(*sin6));
  821         sin6->sin6_family = AF_INET6;
  822         sin6->sin6_len = sizeof(struct sockaddr_in6);
  823         bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
  824         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
  825                 sin6->sin6_addr.s6_addr16[1] = 0;
  826                 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
  827         }
  828         spidx->prefs = sizeof(struct in6_addr) << 3;
  829 
  830         sin6 = (struct sockaddr_in6 *)&spidx->dst;
  831         bzero(sin6, sizeof(*sin6));
  832         sin6->sin6_family = AF_INET6;
  833         sin6->sin6_len = sizeof(struct sockaddr_in6);
  834         bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
  835         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
  836                 sin6->sin6_addr.s6_addr16[1] = 0;
  837                 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
  838         }
  839         spidx->prefd = sizeof(struct in6_addr) << 3;
  840 
  841         return 0;
  842 }
  843 #endif
  844 
  845 static void
  846 ipsec_delpcbpolicy(p)
  847         struct inpcbpolicy *p;
  848 {
  849         free(p, M_SECA);
  850 }
  851 
  852 /* initialize policy in PCB */
  853 int
  854 ipsec_init_policy(so, pcb_sp)
  855         struct socket *so;
  856         struct inpcbpolicy **pcb_sp;
  857 {
  858         struct inpcbpolicy *new;
  859 
  860         /* sanity check. */
  861         if (so == NULL || pcb_sp == NULL)
  862                 panic("ipsec_init_policy: NULL pointer was passed.\n");
  863 
  864         new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy),
  865                                             M_SECA, M_NOWAIT|M_ZERO);
  866         if (new == NULL) {
  867                 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n"));
  868                 return ENOBUFS;
  869         }
  870 
  871         if (so->so_cred != 0 && so->so_cred->cr_uid == 0)
  872                 new->priv = 1;
  873         else
  874                 new->priv = 0;
  875 
  876         if ((new->sp_in = KEY_NEWSP()) == NULL) {
  877                 ipsec_delpcbpolicy(new);
  878                 return ENOBUFS;
  879         }
  880         new->sp_in->state = IPSEC_SPSTATE_ALIVE;
  881         new->sp_in->policy = IPSEC_POLICY_ENTRUST;
  882 
  883         if ((new->sp_out = KEY_NEWSP()) == NULL) {
  884                 KEY_FREESP(&new->sp_in);
  885                 ipsec_delpcbpolicy(new);
  886                 return ENOBUFS;
  887         }
  888         new->sp_out->state = IPSEC_SPSTATE_ALIVE;
  889         new->sp_out->policy = IPSEC_POLICY_ENTRUST;
  890 
  891         *pcb_sp = new;
  892 
  893         return 0;
  894 }
  895 
  896 /* copy old ipsec policy into new */
  897 int
  898 ipsec_copy_policy(old, new)
  899         struct inpcbpolicy *old, *new;
  900 {
  901         struct secpolicy *sp;
  902 
  903         sp = ipsec_deepcopy_policy(old->sp_in);
  904         if (sp) {
  905                 KEY_FREESP(&new->sp_in);
  906                 new->sp_in = sp;
  907         } else
  908                 return ENOBUFS;
  909 
  910         sp = ipsec_deepcopy_policy(old->sp_out);
  911         if (sp) {
  912                 KEY_FREESP(&new->sp_out);
  913                 new->sp_out = sp;
  914         } else
  915                 return ENOBUFS;
  916 
  917         new->priv = old->priv;
  918 
  919         return 0;
  920 }
  921 
  922 /* deep-copy a policy in PCB */
  923 static struct secpolicy *
  924 ipsec_deepcopy_policy(src)
  925         struct secpolicy *src;
  926 {
  927         struct ipsecrequest *newchain = NULL;
  928         struct ipsecrequest *p;
  929         struct ipsecrequest **q;
  930         struct ipsecrequest *r;
  931         struct secpolicy *dst;
  932 
  933         if (src == NULL)
  934                 return NULL;
  935         dst = KEY_NEWSP();
  936         if (dst == NULL)
  937                 return NULL;
  938 
  939         /*
  940          * deep-copy IPsec request chain.  This is required since struct
  941          * ipsecrequest is not reference counted.
  942          */
  943         q = &newchain;
  944         for (p = src->req; p; p = p->next) {
  945                 *q = (struct ipsecrequest *)malloc(sizeof(struct ipsecrequest),
  946                         M_SECA, M_NOWAIT);
  947                 if (*q == NULL)
  948                         goto fail;
  949                 bzero(*q, sizeof(**q));
  950                 (*q)->next = NULL;
  951 
  952                 (*q)->saidx.proto = p->saidx.proto;
  953                 (*q)->saidx.mode = p->saidx.mode;
  954                 (*q)->level = p->level;
  955                 (*q)->saidx.reqid = p->saidx.reqid;
  956 
  957                 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
  958                 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
  959 
  960                 (*q)->sav = NULL;
  961                 (*q)->sp = dst;
  962 
  963                 q = &((*q)->next);
  964         }
  965 
  966         dst->req = newchain;
  967         dst->state = src->state;
  968         dst->policy = src->policy;
  969         /* do not touch the refcnt fields */
  970 
  971         return dst;
  972 
  973 fail:
  974         for (p = newchain; p; p = r) {
  975                 r = p->next;
  976                 free(p, M_SECA);
  977                 p = NULL;
  978         }
  979         return NULL;
  980 }
  981 
  982 /* set policy and ipsec request if present. */
  983 static int
  984 ipsec_set_policy(pcb_sp, optname, request, len, priv)
  985         struct secpolicy **pcb_sp;
  986         int optname;
  987         caddr_t request;
  988         size_t len;
  989         int priv;
  990 {
  991         struct sadb_x_policy *xpl;
  992         struct secpolicy *newsp = NULL;
  993         int error;
  994 
  995         /* sanity check. */
  996         if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
  997                 return EINVAL;
  998         if (len < sizeof(*xpl))
  999                 return EINVAL;
 1000         xpl = (struct sadb_x_policy *)request;
 1001 
 1002         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 1003                 printf("ipsec_set_policy: passed policy\n");
 1004                 kdebug_sadb_x_policy((struct sadb_ext *)xpl));
 1005 
 1006         /* check policy type */
 1007         /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
 1008         if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
 1009          || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
 1010                 return EINVAL;
 1011 
 1012         /* check privileged socket */
 1013         if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS)
 1014                 return EACCES;
 1015 
 1016         /* allocation new SP entry */
 1017         if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
 1018                 return error;
 1019 
 1020         newsp->state = IPSEC_SPSTATE_ALIVE;
 1021 
 1022         /* clear old SP and set new SP */
 1023         KEY_FREESP(pcb_sp);
 1024         *pcb_sp = newsp;
 1025         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 1026                 printf("ipsec_set_policy: new policy\n");
 1027                 kdebug_secpolicy(newsp));
 1028 
 1029         return 0;
 1030 }
 1031 
 1032 static int
 1033 ipsec_get_policy(pcb_sp, mp)
 1034         struct secpolicy *pcb_sp;
 1035         struct mbuf **mp;
 1036 {
 1037 
 1038         /* sanity check. */
 1039         if (pcb_sp == NULL || mp == NULL)
 1040                 return EINVAL;
 1041 
 1042         *mp = key_sp2msg(pcb_sp);
 1043         if (!*mp) {
 1044                 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n"));
 1045                 return ENOBUFS;
 1046         }
 1047 
 1048         (*mp)->m_type = MT_DATA;
 1049         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 1050                 printf("ipsec_get_policy:\n");
 1051                 kdebug_mbuf(*mp));
 1052 
 1053         return 0;
 1054 }
 1055 
 1056 int
 1057 ipsec4_set_policy(inp, optname, request, len, priv)
 1058         struct inpcb *inp;
 1059         int optname;
 1060         caddr_t request;
 1061         size_t len;
 1062         int priv;
 1063 {
 1064         struct sadb_x_policy *xpl;
 1065         struct secpolicy **pcb_sp;
 1066 
 1067         /* sanity check. */
 1068         if (inp == NULL || request == NULL)
 1069                 return EINVAL;
 1070         if (len < sizeof(*xpl))
 1071                 return EINVAL;
 1072         xpl = (struct sadb_x_policy *)request;
 1073 
 1074         /* select direction */
 1075         switch (xpl->sadb_x_policy_dir) {
 1076         case IPSEC_DIR_INBOUND:
 1077                 pcb_sp = &inp->inp_sp->sp_in;
 1078                 break;
 1079         case IPSEC_DIR_OUTBOUND:
 1080                 pcb_sp = &inp->inp_sp->sp_out;
 1081                 break;
 1082         default:
 1083                 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
 1084                         xpl->sadb_x_policy_dir));
 1085                 return EINVAL;
 1086         }
 1087 
 1088         return ipsec_set_policy(pcb_sp, optname, request, len, priv);
 1089 }
 1090 
 1091 int
 1092 ipsec4_get_policy(inp, request, len, mp)
 1093         struct inpcb *inp;
 1094         caddr_t request;
 1095         size_t len;
 1096         struct mbuf **mp;
 1097 {
 1098         struct sadb_x_policy *xpl;
 1099         struct secpolicy *pcb_sp;
 1100 
 1101         /* sanity check. */
 1102         if (inp == NULL || request == NULL || mp == NULL)
 1103                 return EINVAL;
 1104         KASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp"));
 1105         if (len < sizeof(*xpl))
 1106                 return EINVAL;
 1107         xpl = (struct sadb_x_policy *)request;
 1108 
 1109         /* select direction */
 1110         switch (xpl->sadb_x_policy_dir) {
 1111         case IPSEC_DIR_INBOUND:
 1112                 pcb_sp = inp->inp_sp->sp_in;
 1113                 break;
 1114         case IPSEC_DIR_OUTBOUND:
 1115                 pcb_sp = inp->inp_sp->sp_out;
 1116                 break;
 1117         default:
 1118                 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
 1119                         xpl->sadb_x_policy_dir));
 1120                 return EINVAL;
 1121         }
 1122 
 1123         return ipsec_get_policy(pcb_sp, mp);
 1124 }
 1125 
 1126 /* delete policy in PCB */
 1127 int
 1128 ipsec4_delete_pcbpolicy(inp)
 1129         struct inpcb *inp;
 1130 {
 1131         KASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp"));
 1132 
 1133         if (inp->inp_sp == NULL)
 1134                 return 0;
 1135 
 1136         if (inp->inp_sp->sp_in != NULL)
 1137                 KEY_FREESP(&inp->inp_sp->sp_in);
 1138 
 1139         if (inp->inp_sp->sp_out != NULL)
 1140                 KEY_FREESP(&inp->inp_sp->sp_out);
 1141 
 1142         ipsec_delpcbpolicy(inp->inp_sp);
 1143         inp->inp_sp = NULL;
 1144 
 1145         return 0;
 1146 }
 1147 
 1148 #ifdef INET6
 1149 int
 1150 ipsec6_set_policy(in6p, optname, request, len, priv)
 1151         struct in6pcb *in6p;
 1152         int optname;
 1153         caddr_t request;
 1154         size_t len;
 1155         int priv;
 1156 {
 1157         struct sadb_x_policy *xpl;
 1158         struct secpolicy **pcb_sp;
 1159 
 1160         /* sanity check. */
 1161         if (in6p == NULL || request == NULL)
 1162                 return EINVAL;
 1163         if (len < sizeof(*xpl))
 1164                 return EINVAL;
 1165         xpl = (struct sadb_x_policy *)request;
 1166 
 1167         /* select direction */
 1168         switch (xpl->sadb_x_policy_dir) {
 1169         case IPSEC_DIR_INBOUND:
 1170                 pcb_sp = &in6p->in6p_sp->sp_in;
 1171                 break;
 1172         case IPSEC_DIR_OUTBOUND:
 1173                 pcb_sp = &in6p->in6p_sp->sp_out;
 1174                 break;
 1175         default:
 1176                 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
 1177                         xpl->sadb_x_policy_dir));
 1178                 return EINVAL;
 1179         }
 1180 
 1181         return ipsec_set_policy(pcb_sp, optname, request, len, priv);
 1182 }
 1183 
 1184 int
 1185 ipsec6_get_policy(in6p, request, len, mp)
 1186         struct in6pcb *in6p;
 1187         caddr_t request;
 1188         size_t len;
 1189         struct mbuf **mp;
 1190 {
 1191         struct sadb_x_policy *xpl;
 1192         struct secpolicy *pcb_sp;
 1193 
 1194         /* sanity check. */
 1195         if (in6p == NULL || request == NULL || mp == NULL)
 1196                 return EINVAL;
 1197         KASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp"));
 1198         if (len < sizeof(*xpl))
 1199                 return EINVAL;
 1200         xpl = (struct sadb_x_policy *)request;
 1201 
 1202         /* select direction */
 1203         switch (xpl->sadb_x_policy_dir) {
 1204         case IPSEC_DIR_INBOUND:
 1205                 pcb_sp = in6p->in6p_sp->sp_in;
 1206                 break;
 1207         case IPSEC_DIR_OUTBOUND:
 1208                 pcb_sp = in6p->in6p_sp->sp_out;
 1209                 break;
 1210         default:
 1211                 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
 1212                         xpl->sadb_x_policy_dir));
 1213                 return EINVAL;
 1214         }
 1215 
 1216         return ipsec_get_policy(pcb_sp, mp);
 1217 }
 1218 
 1219 int
 1220 ipsec6_delete_pcbpolicy(in6p)
 1221         struct in6pcb *in6p;
 1222 {
 1223         KASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p"));
 1224 
 1225         if (in6p->in6p_sp == NULL)
 1226                 return 0;
 1227 
 1228         if (in6p->in6p_sp->sp_in != NULL)
 1229                 KEY_FREESP(&in6p->in6p_sp->sp_in);
 1230 
 1231         if (in6p->in6p_sp->sp_out != NULL)
 1232                 KEY_FREESP(&in6p->in6p_sp->sp_out);
 1233 
 1234         ipsec_delpcbpolicy(in6p->in6p_sp);
 1235         in6p->in6p_sp = NULL;
 1236 
 1237         return 0;
 1238 }
 1239 #endif
 1240 
 1241 /*
 1242  * return current level.
 1243  * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
 1244  */
 1245 u_int
 1246 ipsec_get_reqlevel(isr)
 1247         struct ipsecrequest *isr;
 1248 {
 1249         u_int level = 0;
 1250         u_int esp_trans_deflev, esp_net_deflev;
 1251         u_int ah_trans_deflev, ah_net_deflev;
 1252 
 1253         KASSERT(isr != NULL && isr->sp != NULL,
 1254                 ("ipsec_get_reqlevel: null argument"));
 1255         KASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
 1256                 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u",
 1257                  isr->sp->spidx.src.sa.sa_family,
 1258                  isr->sp->spidx.dst.sa.sa_family));
 1259 
 1260 /* XXX note that we have ipseclog() expanded here - code sync issue */
 1261 #define IPSEC_CHECK_DEFAULT(lev) \
 1262         (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE            \
 1263                         && (lev) != IPSEC_LEVEL_UNIQUE)                       \
 1264                 ? (ipsec_debug                                                \
 1265                         ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
 1266                                 (lev), IPSEC_LEVEL_REQUIRE)                   \
 1267                         : 0),                                                 \
 1268                         (lev) = IPSEC_LEVEL_REQUIRE,                          \
 1269                         (lev)                                                 \
 1270                 : (lev))
 1271 
 1272         /* set default level */
 1273         switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
 1274 #ifdef INET
 1275         case AF_INET:
 1276                 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
 1277                 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
 1278                 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
 1279                 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
 1280                 break;
 1281 #endif
 1282 #ifdef INET6
 1283         case AF_INET6:
 1284                 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
 1285                 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
 1286                 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
 1287                 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
 1288                 break;
 1289 #endif /* INET6 */
 1290         default:
 1291                 panic("key_get_reqlevel: unknown af %u",
 1292                         isr->sp->spidx.src.sa.sa_family);
 1293         }
 1294 
 1295 #undef IPSEC_CHECK_DEFAULT
 1296 
 1297         /* set level */
 1298         switch (isr->level) {
 1299         case IPSEC_LEVEL_DEFAULT:
 1300                 switch (isr->saidx.proto) {
 1301                 case IPPROTO_ESP:
 1302                         if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
 1303                                 level = esp_net_deflev;
 1304                         else
 1305                                 level = esp_trans_deflev;
 1306                         break;
 1307                 case IPPROTO_AH:
 1308                         if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
 1309                                 level = ah_net_deflev;
 1310                         else
 1311                                 level = ah_trans_deflev;
 1312                 case IPPROTO_IPCOMP:
 1313                         /*
 1314                          * we don't really care, as IPcomp document says that
 1315                          * we shouldn't compress small packets
 1316                          */
 1317                         level = IPSEC_LEVEL_USE;
 1318                         break;
 1319                 default:
 1320                         panic("ipsec_get_reqlevel: "
 1321                                 "Illegal protocol defined %u\n",
 1322                                 isr->saidx.proto);
 1323                 }
 1324                 break;
 1325 
 1326         case IPSEC_LEVEL_USE:
 1327         case IPSEC_LEVEL_REQUIRE:
 1328                 level = isr->level;
 1329                 break;
 1330         case IPSEC_LEVEL_UNIQUE:
 1331                 level = IPSEC_LEVEL_REQUIRE;
 1332                 break;
 1333 
 1334         default:
 1335                 panic("ipsec_get_reqlevel: Illegal IPsec level %u\n",
 1336                         isr->level);
 1337         }
 1338 
 1339         return level;
 1340 }
 1341 
 1342 /*
 1343  * Check security policy requirements against the actual
 1344  * packet contents.  Return one if the packet should be
 1345  * reject as "invalid"; otherwiser return zero to have the
 1346  * packet treated as "valid".
 1347  *
 1348  * OUT:
 1349  *      0: valid
 1350  *      1: invalid
 1351  */
 1352 int
 1353 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
 1354 {
 1355         struct ipsecrequest *isr;
 1356         int need_auth;
 1357 
 1358         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
 1359                 printf("ipsec_in_reject: using SP\n");
 1360                 kdebug_secpolicy(sp));
 1361 
 1362         /* check policy */
 1363         switch (sp->policy) {
 1364         case IPSEC_POLICY_DISCARD:
 1365                 return 1;
 1366         case IPSEC_POLICY_BYPASS:
 1367         case IPSEC_POLICY_NONE:
 1368                 return 0;
 1369         }
 1370 
 1371         KASSERT(sp->policy == IPSEC_POLICY_IPSEC,
 1372                 ("ipsec_in_reject: invalid policy %u", sp->policy));
 1373 
 1374         /* XXX should compare policy against ipsec header history */
 1375 
 1376         need_auth = 0;
 1377         for (isr = sp->req; isr != NULL; isr = isr->next) {
 1378                 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
 1379                         continue;
 1380                 switch (isr->saidx.proto) {
 1381                 case IPPROTO_ESP:
 1382                         if ((m->m_flags & M_DECRYPTED) == 0) {
 1383                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 1384                                     printf("ipsec_in_reject: ESP m_flags:%x\n",
 1385                                             m->m_flags));
 1386                                 return 1;
 1387                         }
 1388 
 1389                         if (!need_auth &&
 1390                             isr->sav != NULL &&
 1391                             isr->sav->tdb_authalgxform != NULL &&
 1392                             (m->m_flags & M_AUTHIPDGM) == 0) {
 1393                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 1394                                     printf("ipsec_in_reject: ESP/AH m_flags:%x\n",
 1395                                             m->m_flags));
 1396                                 return 1;
 1397                         }
 1398                         break;
 1399                 case IPPROTO_AH:
 1400                         need_auth = 1;
 1401                         if ((m->m_flags & M_AUTHIPHDR) == 0) {
 1402                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 1403                                     printf("ipsec_in_reject: AH m_flags:%x\n",
 1404                                             m->m_flags));
 1405                                 return 1;
 1406                         }
 1407                         break;
 1408                 case IPPROTO_IPCOMP:
 1409                         /*
 1410                          * we don't really care, as IPcomp document
 1411                          * says that we shouldn't compress small
 1412                          * packets, IPComp policy should always be
 1413                          * treated as being in "use" level.
 1414                          */
 1415                         break;
 1416                 }
 1417         }
 1418         return 0;               /* valid */
 1419 }
 1420 
 1421 /*
 1422  * Check AH/ESP integrity.
 1423  * This function is called from tcp_input(), udp_input(),
 1424  * and {ah,esp}4_input for tunnel mode
 1425  */
 1426 int
 1427 ipsec4_in_reject(m, inp)
 1428         struct mbuf *m;
 1429         struct inpcb *inp;
 1430 {
 1431         struct secpolicy *sp;
 1432         int error;
 1433         int result;
 1434 
 1435         KASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf"));
 1436 
 1437         /* get SP for this packet.
 1438          * When we are called from ip_forward(), we call
 1439          * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
 1440          */
 1441         if (inp == NULL)
 1442                 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
 1443         else
 1444                 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
 1445 
 1446         if (sp != NULL) {
 1447                 result = ipsec_in_reject(sp, m);
 1448                 if (result)
 1449                         newipsecstat.ips_in_polvio++;
 1450                 KEY_FREESP(&sp);
 1451         } else {
 1452                 result = 0;     /* XXX should be panic ?
 1453                                  * -> No, there may be error. */
 1454         }
 1455         return result;
 1456 }
 1457 
 1458 #ifdef INET6
 1459 /*
 1460  * Check AH/ESP integrity.
 1461  * This function is called from tcp6_input(), udp6_input(),
 1462  * and {ah,esp}6_input for tunnel mode
 1463  */
 1464 int
 1465 ipsec6_in_reject(m, inp)
 1466         struct mbuf *m;
 1467         struct inpcb *inp;
 1468 {
 1469         struct secpolicy *sp = NULL;
 1470         int error;
 1471         int result;
 1472 
 1473         /* sanity check */
 1474         if (m == NULL)
 1475                 return 0;       /* XXX should be panic ? */
 1476 
 1477         /* get SP for this packet.
 1478          * When we are called from ip_forward(), we call
 1479          * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
 1480          */
 1481         if (inp == NULL)
 1482                 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
 1483         else
 1484                 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
 1485 
 1486         if (sp != NULL) {
 1487                 result = ipsec_in_reject(sp, m);
 1488                 if (result)
 1489                         newipsecstat.ips_in_polvio++;
 1490                 KEY_FREESP(&sp);
 1491         } else {
 1492                 result = 0;
 1493         }
 1494         return result;
 1495 }
 1496 #endif
 1497 
 1498 /*
 1499  * compute the byte size to be occupied by IPsec header.
 1500  * in case it is tunneled, it includes the size of outer IP header.
 1501  * NOTE: SP passed is free in this function.
 1502  */
 1503 static size_t
 1504 ipsec_hdrsiz(struct secpolicy *sp)
 1505 {
 1506         struct ipsecrequest *isr;
 1507         size_t siz;
 1508 
 1509         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
 1510                 printf("ipsec_hdrsiz: using SP\n");
 1511                 kdebug_secpolicy(sp));
 1512 
 1513         switch (sp->policy) {
 1514         case IPSEC_POLICY_DISCARD:
 1515         case IPSEC_POLICY_BYPASS:
 1516         case IPSEC_POLICY_NONE:
 1517                 return 0;
 1518         }
 1519 
 1520         KASSERT(sp->policy == IPSEC_POLICY_IPSEC,
 1521                 ("ipsec_hdrsiz: invalid policy %u", sp->policy));
 1522 
 1523         siz = 0;
 1524         for (isr = sp->req; isr != NULL; isr = isr->next) {
 1525                 size_t clen = 0;
 1526 
 1527                 switch (isr->saidx.proto) {
 1528                 case IPPROTO_ESP:
 1529                         clen = esp_hdrsiz(isr->sav);
 1530                         break;
 1531                 case IPPROTO_AH:
 1532                         clen = ah_hdrsiz(isr->sav);
 1533                         break;
 1534                 case IPPROTO_IPCOMP:
 1535                         clen = sizeof(struct ipcomp);
 1536                         break;
 1537                 }
 1538 
 1539                 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
 1540                         switch (isr->saidx.dst.sa.sa_family) {
 1541                         case AF_INET:
 1542                                 clen += sizeof(struct ip);
 1543                                 break;
 1544 #ifdef INET6
 1545                         case AF_INET6:
 1546                                 clen += sizeof(struct ip6_hdr);
 1547                                 break;
 1548 #endif
 1549                         default:
 1550                                 ipseclog((LOG_ERR, "ipsec_hdrsiz: "
 1551                                     "unknown AF %d in IPsec tunnel SA\n",
 1552                                     ((struct sockaddr *)&isr->saidx.dst)->sa_family));
 1553                                 break;
 1554                         }
 1555                 }
 1556                 siz += clen;
 1557         }
 1558 
 1559         return siz;
 1560 }
 1561 
 1562 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
 1563 size_t
 1564 ipsec4_hdrsiz(m, dir, inp)
 1565         struct mbuf *m;
 1566         u_int dir;
 1567         struct inpcb *inp;
 1568 {
 1569         struct secpolicy *sp;
 1570         int error;
 1571         size_t size;
 1572 
 1573         KASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf"));
 1574         KASSERT(inp == NULL || inp->inp_socket != NULL,
 1575                 ("ipsec4_hdrsize: socket w/o inpcb"));
 1576 
 1577         /* get SP for this packet.
 1578          * When we are called from ip_forward(), we call
 1579          * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
 1580          */
 1581         if (inp == NULL)
 1582                 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
 1583         else
 1584                 sp = ipsec_getpolicybysock(m, dir, inp, &error);
 1585 
 1586         if (sp != NULL) {
 1587                 size = ipsec_hdrsiz(sp);
 1588                 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
 1589                         printf("ipsec4_hdrsiz: size:%lu.\n",
 1590                                 (unsigned long)size));
 1591 
 1592                 KEY_FREESP(&sp);
 1593         } else {
 1594                 size = 0;       /* XXX should be panic ? */
 1595         }
 1596         return size;
 1597 }
 1598 
 1599 #ifdef INET6
 1600 /* This function is called from ipsec6_hdrsize_tcp(),
 1601  * and maybe from ip6_forward.()
 1602  */
 1603 size_t
 1604 ipsec6_hdrsiz(m, dir, in6p)
 1605         struct mbuf *m;
 1606         u_int dir;
 1607         struct in6pcb *in6p;
 1608 {
 1609         struct secpolicy *sp;
 1610         int error;
 1611         size_t size;
 1612 
 1613         KASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf"));
 1614         KASSERT(in6p == NULL || in6p->in6p_socket != NULL,
 1615                 ("ipsec6_hdrsize: socket w/o inpcb"));
 1616 
 1617         /* get SP for this packet */
 1618         /* XXX Is it right to call with IP_FORWARDING. */
 1619         if (in6p == NULL)
 1620                 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
 1621         else
 1622                 sp = ipsec_getpolicybysock(m, dir, in6p, &error);
 1623 
 1624         if (sp == NULL)
 1625                 return 0;
 1626         size = ipsec_hdrsiz(sp);
 1627         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
 1628                 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size));
 1629         KEY_FREESP(&sp);
 1630 
 1631         return size;
 1632 }
 1633 #endif /*INET6*/
 1634 
 1635 /*
 1636  * Check the variable replay window.
 1637  * ipsec_chkreplay() performs replay check before ICV verification.
 1638  * ipsec_updatereplay() updates replay bitmap.  This must be called after
 1639  * ICV verification (it also performs replay check, which is usually done
 1640  * beforehand).
 1641  * 0 (zero) is returned if packet disallowed, 1 if packet permitted.
 1642  *
 1643  * based on RFC 2401.
 1644  */
 1645 int
 1646 ipsec_chkreplay(seq, sav)
 1647         u_int32_t seq;
 1648         struct secasvar *sav;
 1649 {
 1650         const struct secreplay *replay;
 1651         u_int32_t diff;
 1652         int fr;
 1653         u_int32_t wsizeb;       /* constant: bits of window size */
 1654         int frlast;             /* constant: last frame */
 1655 
 1656         SPLASSERT(net, "ipsec_chkreplay");
 1657 
 1658         KASSERT(sav != NULL, ("ipsec_chkreplay: Null SA"));
 1659         KASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state"));
 1660 
 1661         replay = sav->replay;
 1662 
 1663         if (replay->wsize == 0)
 1664                 return 1;       /* no need to check replay. */
 1665 
 1666         /* constant */
 1667         frlast = replay->wsize - 1;
 1668         wsizeb = replay->wsize << 3;
 1669 
 1670         /* sequence number of 0 is invalid */
 1671         if (seq == 0)
 1672                 return 0;
 1673 
 1674         /* first time is always okay */
 1675         if (replay->count == 0)
 1676                 return 1;
 1677 
 1678         if (seq > replay->lastseq) {
 1679                 /* larger sequences are okay */
 1680                 return 1;
 1681         } else {
 1682                 /* seq is equal or less than lastseq. */
 1683                 diff = replay->lastseq - seq;
 1684 
 1685                 /* over range to check, i.e. too old or wrapped */
 1686                 if (diff >= wsizeb)
 1687                         return 0;
 1688 
 1689                 fr = frlast - diff / 8;
 1690 
 1691                 /* this packet already seen ? */
 1692                 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
 1693                         return 0;
 1694 
 1695                 /* out of order but good */
 1696                 return 1;
 1697         }
 1698 }
 1699 
 1700 /*
 1701  * check replay counter whether to update or not.
 1702  * OUT: 0:      OK
 1703  *      1:      NG
 1704  */
 1705 int
 1706 ipsec_updatereplay(seq, sav)
 1707         u_int32_t seq;
 1708         struct secasvar *sav;
 1709 {
 1710         struct secreplay *replay;
 1711         u_int32_t diff;
 1712         int fr;
 1713         u_int32_t wsizeb;       /* constant: bits of window size */
 1714         int frlast;             /* constant: last frame */
 1715 
 1716         SPLASSERT(net, "ipsec_updatereplay");
 1717 
 1718         KASSERT(sav != NULL, ("ipsec_updatereplay: Null SA"));
 1719         KASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state"));
 1720 
 1721         replay = sav->replay;
 1722 
 1723         if (replay->wsize == 0)
 1724                 goto ok;        /* no need to check replay. */
 1725 
 1726         /* constant */
 1727         frlast = replay->wsize - 1;
 1728         wsizeb = replay->wsize << 3;
 1729 
 1730         /* sequence number of 0 is invalid */
 1731         if (seq == 0)
 1732                 return 1;
 1733 
 1734         /* first time */
 1735         if (replay->count == 0) {
 1736                 replay->lastseq = seq;
 1737                 bzero(replay->bitmap, replay->wsize);
 1738                 (replay->bitmap)[frlast] = 1;
 1739                 goto ok;
 1740         }
 1741 
 1742         if (seq > replay->lastseq) {
 1743                 /* seq is larger than lastseq. */
 1744                 diff = seq - replay->lastseq;
 1745 
 1746                 /* new larger sequence number */
 1747                 if (diff < wsizeb) {
 1748                         /* In window */
 1749                         /* set bit for this packet */
 1750                         vshiftl(replay->bitmap, diff, replay->wsize);
 1751                         (replay->bitmap)[frlast] |= 1;
 1752                 } else {
 1753                         /* this packet has a "way larger" */
 1754                         bzero(replay->bitmap, replay->wsize);
 1755                         (replay->bitmap)[frlast] = 1;
 1756                 }
 1757                 replay->lastseq = seq;
 1758 
 1759                 /* larger is good */
 1760         } else {
 1761                 /* seq is equal or less than lastseq. */
 1762                 diff = replay->lastseq - seq;
 1763 
 1764                 /* over range to check, i.e. too old or wrapped */
 1765                 if (diff >= wsizeb)
 1766                         return 1;
 1767 
 1768                 fr = frlast - diff / 8;
 1769 
 1770                 /* this packet already seen ? */
 1771                 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
 1772                         return 1;
 1773 
 1774                 /* mark as seen */
 1775                 (replay->bitmap)[fr] |= (1 << (diff % 8));
 1776 
 1777                 /* out of order but good */
 1778         }
 1779 
 1780 ok:
 1781         if (replay->count == ~0) {
 1782 
 1783                 /* set overflow flag */
 1784                 replay->overflow++;
 1785 
 1786                 /* don't increment, no more packets accepted */
 1787                 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
 1788                         return 1;
 1789 
 1790                 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n",
 1791                     replay->overflow, ipsec_logsastr(sav)));
 1792         }
 1793 
 1794         replay->count++;
 1795 
 1796         return 0;
 1797 }
 1798 
 1799 /*
 1800  * shift variable length bunffer to left.
 1801  * IN:  bitmap: pointer to the buffer
 1802  *      nbit:   the number of to shift.
 1803  *      wsize:  buffer size (bytes).
 1804  */
 1805 static void
 1806 vshiftl(bitmap, nbit, wsize)
 1807         unsigned char *bitmap;
 1808         int nbit, wsize;
 1809 {
 1810         int s, j, i;
 1811         unsigned char over;
 1812 
 1813         for (j = 0; j < nbit; j += 8) {
 1814                 s = (nbit - j < 8) ? (nbit - j): 8;
 1815                 bitmap[0] <<= s;
 1816                 for (i = 1; i < wsize; i++) {
 1817                         over = (bitmap[i] >> (8 - s));
 1818                         bitmap[i] <<= s;
 1819                         bitmap[i-1] |= over;
 1820                 }
 1821         }
 1822 
 1823         return;
 1824 }
 1825 
 1826 /* Return a printable string for the IPv4 address. */
 1827 static char *
 1828 inet_ntoa4(struct in_addr ina)
 1829 {
 1830         static char buf[4][4 * sizeof "123" + 4];
 1831         unsigned char *ucp = (unsigned char *) &ina;
 1832         static int i = 3;
 1833 
 1834         i = (i + 1) % 4;
 1835         sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff,
 1836             ucp[2] & 0xff, ucp[3] & 0xff);
 1837         return (buf[i]);
 1838 }
 1839 
 1840 /* Return a printable string for the address. */
 1841 char *
 1842 ipsec_address(union sockaddr_union* sa)
 1843 {
 1844         switch (sa->sa.sa_family) {
 1845 #if INET
 1846         case AF_INET:
 1847                 return inet_ntoa4(sa->sin.sin_addr);
 1848 #endif /* INET */
 1849 
 1850 #if INET6
 1851         case AF_INET6:
 1852                 return ip6_sprintf(&sa->sin6.sin6_addr);
 1853 #endif /* INET6 */
 1854 
 1855         default:
 1856                 return "(unknown address family)";
 1857         }
 1858 }
 1859 
 1860 const char *
 1861 ipsec_logsastr(sav)
 1862         struct secasvar *sav;
 1863 {
 1864         static char buf[256];
 1865         char *p;
 1866         struct secasindex *saidx = &sav->sah->saidx;
 1867 
 1868         KASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
 1869                 ("ipsec_logsastr: address family mismatch"));
 1870 
 1871         p = buf;
 1872         snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
 1873         while (p && *p)
 1874                 p++;
 1875         /* NB: only use ipsec_address on one address at a time */
 1876         snprintf(p, sizeof (buf) - (p - buf), "src=%s ",
 1877                 ipsec_address(&saidx->src));
 1878         while (p && *p)
 1879                 p++;
 1880         snprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
 1881                 ipsec_address(&saidx->dst));
 1882 
 1883         return buf;
 1884 }
 1885 
 1886 void
 1887 ipsec_dumpmbuf(m)
 1888         struct mbuf *m;
 1889 {
 1890         int totlen;
 1891         int i;
 1892         u_char *p;
 1893 
 1894         totlen = 0;
 1895         printf("---\n");
 1896         while (m) {
 1897                 p = mtod(m, u_char *);
 1898                 for (i = 0; i < m->m_len; i++) {
 1899                         printf("%02x ", p[i]);
 1900                         totlen++;
 1901                         if (totlen % 16 == 0)
 1902                                 printf("\n");
 1903                 }
 1904                 m = m->m_next;
 1905         }
 1906         if (totlen % 16 != 0)
 1907                 printf("\n");
 1908         printf("---\n");
 1909 }
 1910 
 1911 /* XXX this stuff doesn't belong here... */
 1912 
 1913 static  struct xformsw* xforms = NULL;
 1914 
 1915 /*
 1916  * Register a transform; typically at system startup.
 1917  */
 1918 void
 1919 xform_register(struct xformsw* xsp)
 1920 {
 1921         xsp->xf_next = xforms;
 1922         xforms = xsp;
 1923 }
 1924 
 1925 /*
 1926  * Initialize transform support in an sav.
 1927  */
 1928 int
 1929 xform_init(struct secasvar *sav, int xftype)
 1930 {
 1931         struct xformsw *xsp;
 1932 
 1933         if (sav->tdb_xform != NULL)     /* previously initialized */
 1934                 return 0;
 1935         for (xsp = xforms; xsp; xsp = xsp->xf_next)
 1936                 if (xsp->xf_type == xftype)
 1937                         return (*xsp->xf_init)(sav, xsp);
 1938         return EINVAL;
 1939 }

Cache object: dd058c19b7951ecd356c76fd0d8c3379


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