sys/netproto/ipsec/ipsec.c

   1 /*      $FreeBSD: src/sys/netipsec/ipsec.c,v 1.2.2.1 2003/01/24 05:11:35 sam Exp $      */
   2 /*      $DragonFly: src/sys/netproto/ipsec/ipsec.c,v 1.5 2004/02/14 21:15:33 dillon Exp $       */
   3 /*      $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */
   4
   5 /*
   6  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the project nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * IPsec controller part.
  36  */
  37
  38 #include "opt_inet.h"
  39 #include "opt_inet6.h"
  40 #include "opt_ipsec.h"
  41
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #include <sys/malloc.h>
  45 #include <sys/mbuf.h>
  46 #include <sys/domain.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 #include <sys/in_cksum.h>
  57
  58 #include <net/if.h>
  59 #include <net/route.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 "ipsec.h"
  81 #ifdef INET6
  82 #include "ipsec6.h"
  83 #endif
  84 #include "ah_var.h"
  85 #include "esp_var.h"
  86 #include "ipcomp.h"             /*XXX*/
  87 #include "ipcomp_var.h"
  88
  89 #include "key.h"
  90 #include "keydb.h"
  91 #include "key_debug.h"
  92
  93 #include "xform.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 (struct mbuf *, struct inpcb *pcb);
 187 #ifdef INET6
 188 static int ipsec6_setspidx_in6pcb (struct mbuf *, struct in6pcb *pcb);
 189 #endif
 190 static int ipsec_setspidx (struct mbuf *, struct secpolicyindex *, int);
 191 static void ipsec4_get_ulp (struct mbuf *m, struct secpolicyindex *, int);
 192 static int ipsec4_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *);
 193 #ifdef INET6
 194 static void ipsec6_get_ulp (struct mbuf *m, struct secpolicyindex *, int);
 195 static int ipsec6_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *);
 196 #endif
 197 static void ipsec_delpcbpolicy (struct inpcbpolicy *);
 198 static struct secpolicy *ipsec_deepcopy_policy (struct secpolicy *src);
 199 static int ipsec_set_policy (struct secpolicy **pcb_sp,
 200         int optname, caddr_t request, size_t len, int priv);
 201 static int ipsec_get_policy (struct secpolicy *pcb_sp, struct mbuf **mp);
 202 static void vshiftl (unsigned char *, int, int);
 203 static size_t ipsec_hdrsiz (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         for (xsp = xforms; xsp; xsp = xsp->xf_next)
1934                 if (xsp->xf_type == xftype)
1935                         return (*xsp->xf_init)(sav, xsp);
1936         return EINVAL;
1937 }