sys/netipsec/ipsec.c

   1 /*      $FreeBSD$       */
   2 /*      $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */
   3
   4 /*-
   5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * IPsec controller part.
  35  */
  36
  37 #include "opt_inet.h"
  38 #include "opt_inet6.h"
  39 #include "opt_ipsec.h"
  40
  41 #include <sys/param.h>
  42 #include <sys/systm.h>
  43 #include <sys/malloc.h>
  44 #include <sys/mbuf.h>
  45 #include <sys/domain.h>
  46 #include <sys/priv.h>
  47 #include <sys/protosw.h>
  48 #include <sys/socket.h>
  49 #include <sys/socketvar.h>
  50 #include <sys/errno.h>
  51 #include <sys/time.h>
  52 #include <sys/kernel.h>
  53 #include <sys/syslog.h>
  54 #include <sys/sysctl.h>
  55 #include <sys/proc.h>
  56
  57 #include <net/if.h>
  58 #include <net/route.h>
  59
  60 #include <netinet/in.h>
  61 #include <netinet/in_systm.h>
  62 #include <netinet/ip.h>
  63 #include <netinet/ip_var.h>
  64 #include <netinet/in_var.h>
  65 #include <netinet/udp.h>
  66 #include <netinet/udp_var.h>
  67 #include <netinet/tcp.h>
  68 #include <netinet/udp.h>
  69
  70 #include <netinet/ip6.h>
  71 #ifdef INET6
  72 #include <netinet6/ip6_var.h>
  73 #endif
  74 #include <netinet/in_pcb.h>
  75 #ifdef INET6
  76 #include <netinet/icmp6.h>
  77 #endif
  78
  79 #include <sys/types.h>
  80 #include <netipsec/ipsec.h>
  81 #ifdef INET6
  82 #include <netipsec/ipsec6.h>
  83 #endif
  84 #include <netipsec/ah_var.h>
  85 #include <netipsec/esp_var.h>
  86 #include <netipsec/ipcomp.h>            /*XXX*/
  87 #include <netipsec/ipcomp_var.h>
  88
  89 #include <netipsec/key.h>
  90 #include <netipsec/keydb.h>
  91 #include <netipsec/key_debug.h>
  92
  93 #include <netipsec/xform.h>
  94
  95 #include <machine/in_cksum.h>
  96
  97 #include <opencrypto/cryptodev.h>
  98
  99 #ifdef IPSEC_DEBUG
 100 int ipsec_debug = 1;
 101 #else
 102 int ipsec_debug = 0;
 103 #endif
 104
 105 /* NB: name changed so netstat doesn't use it */
 106 struct ipsecstat ipsec4stat;
 107 int ip4_ah_offsetmask = 0;      /* maybe IP_DF? */
 108 int ip4_ipsec_dfbit = 0;        /* DF bit on encap. 0: clear 1: set 2: copy */
 109 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE;
 110 int ip4_esp_net_deflev = IPSEC_LEVEL_USE;
 111 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE;
 112 int ip4_ah_net_deflev = IPSEC_LEVEL_USE;
 113 struct secpolicy ip4_def_policy;
 114 int ip4_ipsec_ecn = 0;          /* ECN ignore(-1)/forbidden(0)/allowed(1) */
 115 int ip4_esp_randpad = -1;
 116 /*
 117  * Crypto support requirements:
 118  *
 119  *  1   require hardware support
 120  * -1   require software support
 121  *  0   take anything
 122  */
 123 int     crypto_support = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE;
 124
 125 SYSCTL_DECL(_net_inet_ipsec);
 126
 127 /* net.inet.ipsec */
 128 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY,
 129         def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
 130 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
 131         CTLFLAG_RW, &ip4_esp_trans_deflev,      0, "");
 132 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
 133         CTLFLAG_RW, &ip4_esp_net_deflev,        0, "");
 134 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
 135         CTLFLAG_RW, &ip4_ah_trans_deflev,       0, "");
 136 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
 137         CTLFLAG_RW, &ip4_ah_net_deflev, 0, "");
 138 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS,
 139         ah_cleartos, CTLFLAG_RW,        &ah_cleartos,   0, "");
 140 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK,
 141         ah_offsetmask, CTLFLAG_RW,      &ip4_ah_offsetmask,     0, "");
 142 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT,
 143         dfbit, CTLFLAG_RW,      &ip4_ipsec_dfbit,       0, "");
 144 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN,
 145         ecn, CTLFLAG_RW,        &ip4_ipsec_ecn, 0, "");
 146 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG,
 147         debug, CTLFLAG_RW,      &ipsec_debug,   0, "");
 148 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD,
 149         esp_randpad, CTLFLAG_RW,        &ip4_esp_randpad,       0, "");
 150 SYSCTL_INT(_net_inet_ipsec, OID_AUTO,
 151         crypto_support, CTLFLAG_RW,     &crypto_support,0, "");
 152 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO,
 153         ipsecstats,     CTLFLAG_RD,     &ipsec4stat, ipsecstat, "");
 154
 155 #ifdef REGRESSION
 156 /*
 157  * When set to 1, IPsec will send packets with the same sequence number.
 158  * This allows to verify if the other side has proper replay attacks detection.
 159  */
 160 int ipsec_replay = 0;
 161 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0,
 162     "Emulate replay attack");
 163 /*
 164  * When set 1, IPsec will send packets with corrupted HMAC.
 165  * This allows to verify if the other side properly detects modified packets.
 166  */
 167 int ipsec_integrity = 0;
 168 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW,
 169     &ipsec_integrity, 0, "Emulate man-in-the-middle attack");
 170 #endif
 171
 172 #ifdef INET6
 173 struct ipsecstat ipsec6stat;
 174 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE;
 175 int ip6_esp_net_deflev = IPSEC_LEVEL_USE;
 176 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
 177 int ip6_ah_net_deflev = IPSEC_LEVEL_USE;
 178 int ip6_ipsec_ecn = 0;          /* ECN ignore(-1)/forbidden(0)/allowed(1) */
 179 int ip6_esp_randpad = -1;
 180
 181 SYSCTL_DECL(_net_inet6_ipsec6);
 182
 183 /* net.inet6.ipsec6 */
 184 #ifdef COMPAT_KAME
 185 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD,
 186         0,0, compat_ipsecstats_sysctl, "S", "");
 187 #endif /* COMPAT_KAME */
 188 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
 189         def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
 190 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
 191         CTLFLAG_RW, &ip6_esp_trans_deflev,      0, "");
 192 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
 193         CTLFLAG_RW, &ip6_esp_net_deflev,        0, "");
 194 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
 195         CTLFLAG_RW, &ip6_ah_trans_deflev,       0, "");
 196 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
 197         CTLFLAG_RW, &ip6_ah_net_deflev, 0, "");
 198 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
 199         ecn, CTLFLAG_RW,        &ip6_ipsec_ecn, 0, "");
 200 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG,
 201         debug, CTLFLAG_RW,      &ipsec_debug,   0, "");
 202 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD,
 203         esp_randpad, CTLFLAG_RW,        &ip6_esp_randpad,       0, "");
 204 SYSCTL_STRUCT(_net_inet6_ipsec6, IPSECCTL_STATS,
 205         ipsecstats, CTLFLAG_RD, &ipsec6stat, ipsecstat, "");
 206 #endif /* INET6 */
 207
 208 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb));
 209 #ifdef INET6
 210 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb));
 211 #endif
 212 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int));
 213 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
 214 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
 215 #ifdef INET6
 216 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
 217 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
 218 #endif
 219 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *));
 220 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src));
 221 static int ipsec_set_policy __P((struct secpolicy **pcb_sp,
 222         int optname, caddr_t request, size_t len, int priv));
 223 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp));
 224 static void vshiftl __P((unsigned char *, int, int));
 225 static size_t ipsec_hdrsiz __P((struct secpolicy *));
 226
 227 MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy");
 228
 229 /*
 230  * Return a held reference to the default SP.
 231  */
 232 static struct secpolicy *
 233 key_allocsp_default(const char* where, int tag)
 234 {
 235         struct secpolicy *sp;
 236
 237         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 238                 printf("DP key_allocsp_default from %s:%u\n", where, tag));
 239
 240         sp = &ip4_def_policy;
 241         if (sp->policy != IPSEC_POLICY_DISCARD &&
 242             sp->policy != IPSEC_POLICY_NONE) {
 243                 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n",
 244                     sp->policy, IPSEC_POLICY_NONE));
 245                 sp->policy = IPSEC_POLICY_NONE;
 246         }
 247         key_addref(sp);
 248
 249         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 250                 printf("DP key_allocsp_default returns SP:%p (%u)\n",
 251                         sp, sp->refcnt));
 252         return sp;
 253 }
 254 #define KEY_ALLOCSP_DEFAULT() \
 255         key_allocsp_default(__FILE__, __LINE__)
 256
 257 /*
 258  * For OUTBOUND packet having a socket. Searching SPD for packet,
 259  * and return a pointer to SP.
 260  * OUT: NULL:   no apropreate SP found, the following value is set to error.
 261  *              0       : bypass
 262  *              EACCES  : discard packet.
 263  *              ENOENT  : ipsec_acquire() in progress, maybe.
 264  *              others  : error occured.
 265  *      others: a pointer to SP
 266  *
 267  * NOTE: IPv6 mapped adddress concern is implemented here.
 268  */
 269 struct secpolicy *
 270 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir)
 271 {
 272         struct secpolicy *sp;
 273
 274         IPSEC_ASSERT(tdbi != NULL, ("null tdbi"));
 275         IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
 276                 ("invalid direction %u", dir));
 277
 278         sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir);
 279         if (sp == NULL)                 /*XXX????*/
 280                 sp = KEY_ALLOCSP_DEFAULT();
 281         IPSEC_ASSERT(sp != NULL, ("null SP"));
 282         return sp;
 283 }
 284
 285 /*
 286  * For OUTBOUND packet having a socket. Searching SPD for packet,
 287  * and return a pointer to SP.
 288  * OUT: NULL:   no apropreate SP found, the following value is set to error.
 289  *              0       : bypass
 290  *              EACCES  : discard packet.
 291  *              ENOENT  : ipsec_acquire() in progress, maybe.
 292  *              others  : error occured.
 293  *      others: a pointer to SP
 294  *
 295  * NOTE: IPv6 mapped adddress concern is implemented here.
 296  */
 297 struct secpolicy *
 298 ipsec_getpolicybysock(m, dir, inp, error)
 299         struct mbuf *m;
 300         u_int dir;
 301         struct inpcb *inp;
 302         int *error;
 303 {
 304         struct inpcbpolicy *pcbsp = NULL;
 305         struct secpolicy *currsp = NULL;        /* policy on socket */
 306         struct secpolicy *sp;
 307
 308         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 309         IPSEC_ASSERT(inp != NULL, ("null inpcb"));
 310         IPSEC_ASSERT(error != NULL, ("null error"));
 311         IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
 312                 ("invalid direction %u", dir));
 313
 314         /* set spidx in pcb */
 315         if (inp->inp_vflag & INP_IPV6PROTO) {
 316 #ifdef INET6
 317                 *error = ipsec6_setspidx_in6pcb(m, inp);
 318                 pcbsp = inp->in6p_sp;
 319 #else
 320                 *error = EINVAL;                /* should not happen */
 321 #endif
 322         } else {
 323                 *error = ipsec4_setspidx_inpcb(m, inp);
 324                 pcbsp = inp->inp_sp;
 325         }
 326         if (*error)
 327                 return NULL;
 328
 329         IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp"));
 330         switch (dir) {
 331         case IPSEC_DIR_INBOUND:
 332                 currsp = pcbsp->sp_in;
 333                 break;
 334         case IPSEC_DIR_OUTBOUND:
 335                 currsp = pcbsp->sp_out;
 336                 break;
 337         }
 338         IPSEC_ASSERT(currsp != NULL, ("null currsp"));
 339
 340         if (pcbsp->priv) {                      /* when privilieged socket */
 341                 switch (currsp->policy) {
 342                 case IPSEC_POLICY_BYPASS:
 343                 case IPSEC_POLICY_IPSEC:
 344                         key_addref(currsp);
 345                         sp = currsp;
 346                         break;
 347
 348                 case IPSEC_POLICY_ENTRUST:
 349                         /* look for a policy in SPD */
 350                         sp = KEY_ALLOCSP(&currsp->spidx, dir);
 351                         if (sp == NULL)         /* no SP found */
 352                                 sp = KEY_ALLOCSP_DEFAULT();
 353                         break;
 354
 355                 default:
 356                         ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n",
 357                                 __func__, currsp->policy));
 358                         *error = EINVAL;
 359                         return NULL;
 360                 }
 361         } else {                                /* unpriv, SPD has policy */
 362                 sp = KEY_ALLOCSP(&currsp->spidx, dir);
 363                 if (sp == NULL) {               /* no SP found */
 364                         switch (currsp->policy) {
 365                         case IPSEC_POLICY_BYPASS:
 366                                 ipseclog((LOG_ERR, "%s: Illegal policy for "
 367                                         "non-priviliged defined %d\n",
 368                                         __func__, currsp->policy));
 369                                 *error = EINVAL;
 370                                 return NULL;
 371
 372                         case IPSEC_POLICY_ENTRUST:
 373                                 sp = KEY_ALLOCSP_DEFAULT();
 374                                 break;
 375
 376                         case IPSEC_POLICY_IPSEC:
 377                                 key_addref(currsp);
 378                                 sp = currsp;
 379                                 break;
 380
 381                         default:
 382                                 ipseclog((LOG_ERR, "%s: Invalid policy for "
 383                                         "PCB %d\n", __func__, currsp->policy));
 384                                 *error = EINVAL;
 385                                 return NULL;
 386                         }
 387                 }
 388         }
 389         IPSEC_ASSERT(sp != NULL,
 390                 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy));
 391         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 392                 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n",
 393                         __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt));
 394         return sp;
 395 }
 396
 397 /*
 398  * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
 399  * and return a pointer to SP.
 400  * OUT: positive: a pointer to the entry for security policy leaf matched.
 401  *      NULL:   no apropreate SP found, the following value is set to error.
 402  *              0       : bypass
 403  *              EACCES  : discard packet.
 404  *              ENOENT  : ipsec_acquire() in progress, maybe.
 405  *              others  : error occured.
 406  */
 407 struct secpolicy *
 408 ipsec_getpolicybyaddr(m, dir, flag, error)
 409         struct mbuf *m;
 410         u_int dir;
 411         int flag;
 412         int *error;
 413 {
 414         struct secpolicyindex spidx;
 415         struct secpolicy *sp;
 416
 417         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 418         IPSEC_ASSERT(error != NULL, ("null error"));
 419         IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
 420                 ("invalid direction %u", dir));
 421
 422         sp = NULL;
 423         if (key_havesp(dir)) {
 424                 /* Make an index to look for a policy. */
 425                 *error = ipsec_setspidx(m, &spidx,
 426                                         (flag & IP_FORWARDING) ? 0 : 1);
 427                 if (*error != 0) {
 428                         DPRINTF(("%s: setpidx failed, dir %u flag %u\n",
 429                                 __func__, dir, flag));
 430                         return NULL;
 431                 }
 432                 spidx.dir = dir;
 433
 434                 sp = KEY_ALLOCSP(&spidx, dir);
 435         }
 436         if (sp == NULL)                 /* no SP found, use system default */
 437                 sp = KEY_ALLOCSP_DEFAULT();
 438         IPSEC_ASSERT(sp != NULL, ("null SP"));
 439         return sp;
 440 }
 441
 442 struct secpolicy *
 443 ipsec4_checkpolicy(m, dir, flag, error, inp)
 444         struct mbuf *m;
 445         u_int dir, flag;
 446         int *error;
 447         struct inpcb *inp;
 448 {
 449         struct secpolicy *sp;
 450
 451         *error = 0;
 452         if (inp == NULL)
 453                 sp = ipsec_getpolicybyaddr(m, dir, flag, error);
 454         else
 455                 sp = ipsec_getpolicybysock(m, dir, inp, error);
 456         if (sp == NULL) {
 457                 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error"));
 458                 ipsec4stat.ips_out_inval++;
 459                 return NULL;
 460         }
 461         IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error));
 462         switch (sp->policy) {
 463         case IPSEC_POLICY_ENTRUST:
 464         default:
 465                 printf("%s: invalid policy %u\n", __func__, sp->policy);
 466                 /* fall thru... */
 467         case IPSEC_POLICY_DISCARD:
 468                 ipsec4stat.ips_out_polvio++;
 469                 *error = -EINVAL;       /* packet is discarded by caller */
 470                 break;
 471         case IPSEC_POLICY_BYPASS:
 472         case IPSEC_POLICY_NONE:
 473                 KEY_FREESP(&sp);
 474                 sp = NULL;              /* NB: force NULL result */
 475                 break;
 476         case IPSEC_POLICY_IPSEC:
 477                 if (sp->req == NULL)    /* acquire an SA */
 478                         *error = key_spdacquire(sp);
 479                 break;
 480         }
 481         if (*error != 0) {
 482                 KEY_FREESP(&sp);
 483                 sp = NULL;
 484         }
 485         return sp;
 486 }
 487
 488 static int
 489 ipsec4_setspidx_inpcb(m, pcb)
 490         struct mbuf *m;
 491         struct inpcb *pcb;
 492 {
 493         int error;
 494
 495         IPSEC_ASSERT(pcb != NULL, ("null pcb"));
 496         IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp"));
 497         IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
 498                 ("null sp_in || sp_out"));
 499
 500         error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
 501         if (error == 0) {
 502                 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
 503                 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
 504                 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
 505         } else {
 506                 bzero(&pcb->inp_sp->sp_in->spidx,
 507                         sizeof (pcb->inp_sp->sp_in->spidx));
 508                 bzero(&pcb->inp_sp->sp_out->spidx,
 509                         sizeof (pcb->inp_sp->sp_in->spidx));
 510         }
 511         return error;
 512 }
 513
 514 #ifdef INET6
 515 static int
 516 ipsec6_setspidx_in6pcb(m, pcb)
 517         struct mbuf *m;
 518         struct in6pcb *pcb;
 519 {
 520         struct secpolicyindex *spidx;
 521         int error;
 522
 523         IPSEC_ASSERT(pcb != NULL, ("null pcb"));
 524         IPSEC_ASSERT(pcb->in6p_sp != NULL, ("null inp_sp"));
 525         IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL,
 526                 ("null sp_in || sp_out"));
 527
 528         bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
 529         bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
 530
 531         spidx = &pcb->in6p_sp->sp_in->spidx;
 532         error = ipsec_setspidx(m, spidx, 1);
 533         if (error)
 534                 goto bad;
 535         spidx->dir = IPSEC_DIR_INBOUND;
 536
 537         spidx = &pcb->in6p_sp->sp_out->spidx;
 538         error = ipsec_setspidx(m, spidx, 1);
 539         if (error)
 540                 goto bad;
 541         spidx->dir = IPSEC_DIR_OUTBOUND;
 542
 543         return 0;
 544
 545 bad:
 546         bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
 547         bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
 548         return error;
 549 }
 550 #endif
 551
 552 /*
 553  * configure security policy index (src/dst/proto/sport/dport)
 554  * by looking at the content of mbuf.
 555  * the caller is responsible for error recovery (like clearing up spidx).
 556  */
 557 static int
 558 ipsec_setspidx(m, spidx, needport)
 559         struct mbuf *m;
 560         struct secpolicyindex *spidx;
 561         int needport;
 562 {
 563         struct ip *ip = NULL;
 564         struct ip ipbuf;
 565         u_int v;
 566         struct mbuf *n;
 567         int len;
 568         int error;
 569
 570         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 571
 572         /*
 573          * validate m->m_pkthdr.len.  we see incorrect length if we
 574          * mistakenly call this function with inconsistent mbuf chain
 575          * (like 4.4BSD tcp/udp processing).  XXX should we panic here?
 576          */
 577         len = 0;
 578         for (n = m; n; n = n->m_next)
 579                 len += n->m_len;
 580         if (m->m_pkthdr.len != len) {
 581                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 582                         printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n",
 583                                 __func__, len, m->m_pkthdr.len));
 584                 return EINVAL;
 585         }
 586
 587         if (m->m_pkthdr.len < sizeof(struct ip)) {
 588                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 589                         printf("%s: pkthdr len(%d) too small (v4), ignored.\n",
 590                             __func__, m->m_pkthdr.len));
 591                 return EINVAL;
 592         }
 593
 594         if (m->m_len >= sizeof(*ip))
 595                 ip = mtod(m, struct ip *);
 596         else {
 597                 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
 598                 ip = &ipbuf;
 599         }
 600 #ifdef _IP_VHL
 601         v = _IP_VHL_V(ip->ip_vhl);
 602 #else
 603         v = ip->ip_v;
 604 #endif
 605         switch (v) {
 606         case 4:
 607                 error = ipsec4_setspidx_ipaddr(m, spidx);
 608                 if (error)
 609                         return error;
 610                 ipsec4_get_ulp(m, spidx, needport);
 611                 return 0;
 612 #ifdef INET6
 613         case 6:
 614                 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
 615                         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 616                                 printf("%s: pkthdr len(%d) too small (v6), "
 617                                 "ignored\n", __func__, m->m_pkthdr.len));
 618                         return EINVAL;
 619                 }
 620                 error = ipsec6_setspidx_ipaddr(m, spidx);
 621                 if (error)
 622                         return error;
 623                 ipsec6_get_ulp(m, spidx, needport);
 624                 return 0;
 625 #endif
 626         default:
 627                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 628                         printf("%s: " "unknown IP version %u, ignored.\n",
 629                                 __func__, v));
 630                 return EINVAL;
 631         }
 632 }
 633
 634 static void
 635 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
 636 {
 637         u_int8_t nxt;
 638         int off;
 639
 640         /* sanity check */
 641         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 642         IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short"));
 643
 644         /* NB: ip_input() flips it into host endian XXX need more checking */
 645         if (m->m_len < sizeof (struct ip)) {
 646                 struct ip *ip = mtod(m, struct ip *);
 647                 if (ip->ip_off & (IP_MF | IP_OFFMASK))
 648                         goto done;
 649 #ifdef _IP_VHL
 650                 off = _IP_VHL_HL(ip->ip_vhl) << 2;
 651 #else
 652                 off = ip->ip_hl << 2;
 653 #endif
 654                 nxt = ip->ip_p;
 655         } else {
 656                 struct ip ih;
 657
 658                 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih);
 659                 if (ih.ip_off & (IP_MF | IP_OFFMASK))
 660                         goto done;
 661 #ifdef _IP_VHL
 662                 off = _IP_VHL_HL(ih.ip_vhl) << 2;
 663 #else
 664                 off = ih.ip_hl << 2;
 665 #endif
 666                 nxt = ih.ip_p;
 667         }
 668
 669         while (off < m->m_pkthdr.len) {
 670                 struct ip6_ext ip6e;
 671                 struct tcphdr th;
 672                 struct udphdr uh;
 673
 674                 switch (nxt) {
 675                 case IPPROTO_TCP:
 676                         spidx->ul_proto = nxt;
 677                         if (!needport)
 678                                 goto done_proto;
 679                         if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
 680                                 goto done;
 681                         m_copydata(m, off, sizeof (th), (caddr_t) &th);
 682                         spidx->src.sin.sin_port = th.th_sport;
 683                         spidx->dst.sin.sin_port = th.th_dport;
 684                         return;
 685                 case IPPROTO_UDP:
 686                         spidx->ul_proto = nxt;
 687                         if (!needport)
 688                                 goto done_proto;
 689                         if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
 690                                 goto done;
 691                         m_copydata(m, off, sizeof (uh), (caddr_t) &uh);
 692                         spidx->src.sin.sin_port = uh.uh_sport;
 693                         spidx->dst.sin.sin_port = uh.uh_dport;
 694                         return;
 695                 case IPPROTO_AH:
 696                         if (off + sizeof(ip6e) > m->m_pkthdr.len)
 697                                 goto done;
 698                         /* XXX sigh, this works but is totally bogus */
 699                         m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e);
 700                         off += (ip6e.ip6e_len + 2) << 2;
 701                         nxt = ip6e.ip6e_nxt;
 702                         break;
 703                 case IPPROTO_ICMP:
 704                 default:
 705                         /* XXX intermediate headers??? */
 706                         spidx->ul_proto = nxt;
 707                         goto done_proto;
 708                 }
 709         }
 710 done:
 711         spidx->ul_proto = IPSEC_ULPROTO_ANY;
 712 done_proto:
 713         spidx->src.sin.sin_port = IPSEC_PORT_ANY;
 714         spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
 715 }
 716
 717 /* assumes that m is sane */
 718 static int
 719 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
 720 {
 721         static const struct sockaddr_in template = {
 722                 sizeof (struct sockaddr_in),
 723                 AF_INET,
 724                 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
 725         };
 726
 727         spidx->src.sin = template;
 728         spidx->dst.sin = template;
 729
 730         if (m->m_len < sizeof (struct ip)) {
 731                 m_copydata(m, offsetof(struct ip, ip_src),
 732                            sizeof (struct  in_addr),
 733                            (caddr_t) &spidx->src.sin.sin_addr);
 734                 m_copydata(m, offsetof(struct ip, ip_dst),
 735                            sizeof (struct  in_addr),
 736                            (caddr_t) &spidx->dst.sin.sin_addr);
 737         } else {
 738                 struct ip *ip = mtod(m, struct ip *);
 739                 spidx->src.sin.sin_addr = ip->ip_src;
 740                 spidx->dst.sin.sin_addr = ip->ip_dst;
 741         }
 742
 743         spidx->prefs = sizeof(struct in_addr) << 3;
 744         spidx->prefd = sizeof(struct in_addr) << 3;
 745
 746         return 0;
 747 }
 748
 749 #ifdef INET6
 750 static void
 751 ipsec6_get_ulp(m, spidx, needport)
 752         struct mbuf *m;
 753         struct secpolicyindex *spidx;
 754         int needport;
 755 {
 756         int off, nxt;
 757         struct tcphdr th;
 758         struct udphdr uh;
 759         struct icmp6_hdr ih;
 760
 761         /* sanity check */
 762         if (m == NULL)
 763                 panic("%s: NULL pointer was passed.\n", __func__);
 764
 765         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 766                 printf("%s:\n", __func__); kdebug_mbuf(m));
 767
 768         /* set default */
 769         spidx->ul_proto = IPSEC_ULPROTO_ANY;
 770         ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
 771         ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
 772
 773         nxt = -1;
 774         off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
 775         if (off < 0 || m->m_pkthdr.len < off)
 776                 return;
 777
 778         switch (nxt) {
 779         case IPPROTO_TCP:
 780                 spidx->ul_proto = nxt;
 781                 if (!needport)
 782                         break;
 783                 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
 784                         break;
 785                 m_copydata(m, off, sizeof(th), (caddr_t)&th);
 786                 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
 787                 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
 788                 break;
 789         case IPPROTO_UDP:
 790                 spidx->ul_proto = nxt;
 791                 if (!needport)
 792                         break;
 793                 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
 794                         break;
 795                 m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
 796                 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
 797                 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
 798                 break;
 799         case IPPROTO_ICMPV6:
 800                 spidx->ul_proto = nxt;
 801                 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len)
 802                         break;
 803                 m_copydata(m, off, sizeof(ih), (caddr_t)&ih);
 804                 ((struct sockaddr_in6 *)&spidx->src)->sin6_port =
 805                     htons((uint16_t)ih.icmp6_type);
 806                 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port =
 807                     htons((uint16_t)ih.icmp6_code);
 808                 break;
 809         default:
 810                 /* XXX intermediate headers??? */
 811                 spidx->ul_proto = nxt;
 812                 break;
 813         }
 814 }
 815
 816 /* assumes that m is sane */
 817 static int
 818 ipsec6_setspidx_ipaddr(m, spidx)
 819         struct mbuf *m;
 820         struct secpolicyindex *spidx;
 821 {
 822         struct ip6_hdr *ip6 = NULL;
 823         struct ip6_hdr ip6buf;
 824         struct sockaddr_in6 *sin6;
 825
 826         if (m->m_len >= sizeof(*ip6))
 827                 ip6 = mtod(m, struct ip6_hdr *);
 828         else {
 829                 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
 830                 ip6 = &ip6buf;
 831         }
 832
 833         sin6 = (struct sockaddr_in6 *)&spidx->src;
 834         bzero(sin6, sizeof(*sin6));
 835         sin6->sin6_family = AF_INET6;
 836         sin6->sin6_len = sizeof(struct sockaddr_in6);
 837         bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
 838         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
 839                 sin6->sin6_addr.s6_addr16[1] = 0;
 840                 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
 841         }
 842         spidx->prefs = sizeof(struct in6_addr) << 3;
 843
 844         sin6 = (struct sockaddr_in6 *)&spidx->dst;
 845         bzero(sin6, sizeof(*sin6));
 846         sin6->sin6_family = AF_INET6;
 847         sin6->sin6_len = sizeof(struct sockaddr_in6);
 848         bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
 849         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
 850                 sin6->sin6_addr.s6_addr16[1] = 0;
 851                 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
 852         }
 853         spidx->prefd = sizeof(struct in6_addr) << 3;
 854
 855         return 0;
 856 }
 857 #endif
 858
 859 static void
 860 ipsec_delpcbpolicy(p)
 861         struct inpcbpolicy *p;
 862 {
 863         free(p, M_IPSEC_INPCB);
 864 }
 865
 866 /* initialize policy in PCB */
 867 int
 868 ipsec_init_policy(so, pcb_sp)
 869         struct socket *so;
 870         struct inpcbpolicy **pcb_sp;
 871 {
 872         struct inpcbpolicy *new;
 873
 874         /* sanity check. */
 875         if (so == NULL || pcb_sp == NULL)
 876                 panic("%s: NULL pointer was passed.\n", __func__);
 877
 878         new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy),
 879                                             M_IPSEC_INPCB, M_NOWAIT|M_ZERO);
 880         if (new == NULL) {
 881                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
 882                 return ENOBUFS;
 883         }
 884
 885         new->priv = IPSEC_IS_PRIVILEGED_SO(so);
 886
 887         if ((new->sp_in = KEY_NEWSP()) == NULL) {
 888                 ipsec_delpcbpolicy(new);
 889                 return ENOBUFS;
 890         }
 891         new->sp_in->state = IPSEC_SPSTATE_ALIVE;
 892         new->sp_in->policy = IPSEC_POLICY_ENTRUST;
 893
 894         if ((new->sp_out = KEY_NEWSP()) == NULL) {
 895                 KEY_FREESP(&new->sp_in);
 896                 ipsec_delpcbpolicy(new);
 897                 return ENOBUFS;
 898         }
 899         new->sp_out->state = IPSEC_SPSTATE_ALIVE;
 900         new->sp_out->policy = IPSEC_POLICY_ENTRUST;
 901
 902         *pcb_sp = new;
 903
 904         return 0;
 905 }
 906
 907 /* copy old ipsec policy into new */
 908 int
 909 ipsec_copy_policy(old, new)
 910         struct inpcbpolicy *old, *new;
 911 {
 912         struct secpolicy *sp;
 913
 914         sp = ipsec_deepcopy_policy(old->sp_in);
 915         if (sp) {
 916                 KEY_FREESP(&new->sp_in);
 917                 new->sp_in = sp;
 918         } else
 919                 return ENOBUFS;
 920
 921         sp = ipsec_deepcopy_policy(old->sp_out);
 922         if (sp) {
 923                 KEY_FREESP(&new->sp_out);
 924                 new->sp_out = sp;
 925         } else
 926                 return ENOBUFS;
 927
 928         new->priv = old->priv;
 929
 930         return 0;
 931 }
 932
 933 struct ipsecrequest *
 934 ipsec_newisr(void)
 935 {
 936         struct ipsecrequest *p;
 937
 938         p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO);
 939         if (p != NULL)
 940                 IPSECREQUEST_LOCK_INIT(p);
 941         return p;
 942 }
 943
 944 void
 945 ipsec_delisr(struct ipsecrequest *p)
 946 {
 947         IPSECREQUEST_LOCK_DESTROY(p);
 948         free(p, M_IPSEC_SR);
 949 }
 950
 951 /* deep-copy a policy in PCB */
 952 static struct secpolicy *
 953 ipsec_deepcopy_policy(src)
 954         struct secpolicy *src;
 955 {
 956         struct ipsecrequest *newchain = NULL;
 957         struct ipsecrequest *p;
 958         struct ipsecrequest **q;
 959         struct ipsecrequest *r;
 960         struct secpolicy *dst;
 961
 962         if (src == NULL)
 963                 return NULL;
 964         dst = KEY_NEWSP();
 965         if (dst == NULL)
 966                 return NULL;
 967
 968         /*
 969          * deep-copy IPsec request chain.  This is required since struct
 970          * ipsecrequest is not reference counted.
 971          */
 972         q = &newchain;
 973         for (p = src->req; p; p = p->next) {
 974                 *q = ipsec_newisr();
 975                 if (*q == NULL)
 976                         goto fail;
 977                 (*q)->saidx.proto = p->saidx.proto;
 978                 (*q)->saidx.mode = p->saidx.mode;
 979                 (*q)->level = p->level;
 980                 (*q)->saidx.reqid = p->saidx.reqid;
 981
 982                 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
 983                 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
 984
 985                 (*q)->sp = dst;
 986
 987                 q = &((*q)->next);
 988         }
 989
 990         dst->req = newchain;
 991         dst->state = src->state;
 992         dst->policy = src->policy;
 993         /* do not touch the refcnt fields */
 994
 995         return dst;
 996
 997 fail:
 998         for (p = newchain; p; p = r) {
 999                 r = p->next;
1000                 ipsec_delisr(p);
1001                 p = NULL;
1002         }
1003         return NULL;
1004 }
1005
1006 /* set policy and ipsec request if present. */
1007 static int
1008 ipsec_set_policy(pcb_sp, optname, request, len, priv)
1009         struct secpolicy **pcb_sp;
1010         int optname;
1011         caddr_t request;
1012         size_t len;
1013         int priv;
1014 {
1015         struct sadb_x_policy *xpl;
1016         struct secpolicy *newsp = NULL;
1017         int error;
1018
1019         /* sanity check. */
1020         if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
1021                 return EINVAL;
1022         if (len < sizeof(*xpl))
1023                 return EINVAL;
1024         xpl = (struct sadb_x_policy *)request;
1025
1026         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1027                 printf("%s: passed policy\n", __func__);
1028                 kdebug_sadb_x_policy((struct sadb_ext *)xpl));
1029
1030         /* check policy type */
1031         /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
1032         if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
1033          || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
1034                 return EINVAL;
1035
1036         /* check privileged socket */
1037         if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS)
1038                 return EACCES;
1039
1040         /* allocation new SP entry */
1041         if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
1042                 return error;
1043
1044         newsp->state = IPSEC_SPSTATE_ALIVE;
1045
1046         /* clear old SP and set new SP */
1047         KEY_FREESP(pcb_sp);
1048         *pcb_sp = newsp;
1049         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1050                 printf("%s: new policy\n", __func__);
1051                 kdebug_secpolicy(newsp));
1052
1053         return 0;
1054 }
1055
1056 static int
1057 ipsec_get_policy(pcb_sp, mp)
1058         struct secpolicy *pcb_sp;
1059         struct mbuf **mp;
1060 {
1061
1062         /* sanity check. */
1063         if (pcb_sp == NULL || mp == NULL)
1064                 return EINVAL;
1065
1066         *mp = key_sp2msg(pcb_sp);
1067         if (!*mp) {
1068                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
1069                 return ENOBUFS;
1070         }
1071
1072         (*mp)->m_type = MT_DATA;
1073         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1074                 printf("%s:\n", __func__); kdebug_mbuf(*mp));
1075
1076         return 0;
1077 }
1078
1079 int
1080 ipsec4_set_policy(inp, optname, request, len, priv)
1081         struct inpcb *inp;
1082         int optname;
1083         caddr_t request;
1084         size_t len;
1085         int priv;
1086 {
1087         struct sadb_x_policy *xpl;
1088         struct secpolicy **pcb_sp;
1089
1090         /* sanity check. */
1091         if (inp == NULL || request == NULL)
1092                 return EINVAL;
1093         if (len < sizeof(*xpl))
1094                 return EINVAL;
1095         xpl = (struct sadb_x_policy *)request;
1096
1097         /* select direction */
1098         switch (xpl->sadb_x_policy_dir) {
1099         case IPSEC_DIR_INBOUND:
1100                 pcb_sp = &inp->inp_sp->sp_in;
1101                 break;
1102         case IPSEC_DIR_OUTBOUND:
1103                 pcb_sp = &inp->inp_sp->sp_out;
1104                 break;
1105         default:
1106                 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1107                         xpl->sadb_x_policy_dir));
1108                 return EINVAL;
1109         }
1110
1111         return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1112 }
1113
1114 int
1115 ipsec4_get_policy(inp, request, len, mp)
1116         struct inpcb *inp;
1117         caddr_t request;
1118         size_t len;
1119         struct mbuf **mp;
1120 {
1121         struct sadb_x_policy *xpl;
1122         struct secpolicy *pcb_sp;
1123
1124         /* sanity check. */
1125         if (inp == NULL || request == NULL || mp == NULL)
1126                 return EINVAL;
1127         IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp"));
1128         if (len < sizeof(*xpl))
1129                 return EINVAL;
1130         xpl = (struct sadb_x_policy *)request;
1131
1132         /* select direction */
1133         switch (xpl->sadb_x_policy_dir) {
1134         case IPSEC_DIR_INBOUND:
1135                 pcb_sp = inp->inp_sp->sp_in;
1136                 break;
1137         case IPSEC_DIR_OUTBOUND:
1138                 pcb_sp = inp->inp_sp->sp_out;
1139                 break;
1140         default:
1141                 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1142                         xpl->sadb_x_policy_dir));
1143                 return EINVAL;
1144         }
1145
1146         return ipsec_get_policy(pcb_sp, mp);
1147 }
1148
1149 /* delete policy in PCB */
1150 int
1151 ipsec4_delete_pcbpolicy(inp)
1152         struct inpcb *inp;
1153 {
1154         IPSEC_ASSERT(inp != NULL, ("null inp"));
1155
1156         if (inp->inp_sp == NULL)
1157                 return 0;
1158
1159         if (inp->inp_sp->sp_in != NULL)
1160                 KEY_FREESP(&inp->inp_sp->sp_in);
1161
1162         if (inp->inp_sp->sp_out != NULL)
1163                 KEY_FREESP(&inp->inp_sp->sp_out);
1164
1165         ipsec_delpcbpolicy(inp->inp_sp);
1166         inp->inp_sp = NULL;
1167
1168         return 0;
1169 }
1170
1171 #ifdef INET6
1172 int
1173 ipsec6_set_policy(in6p, optname, request, len, priv)
1174         struct in6pcb *in6p;
1175         int optname;
1176         caddr_t request;
1177         size_t len;
1178         int priv;
1179 {
1180         struct sadb_x_policy *xpl;
1181         struct secpolicy **pcb_sp;
1182
1183         /* sanity check. */
1184         if (in6p == NULL || request == NULL)
1185                 return EINVAL;
1186         if (len < sizeof(*xpl))
1187                 return EINVAL;
1188         xpl = (struct sadb_x_policy *)request;
1189
1190         /* select direction */
1191         switch (xpl->sadb_x_policy_dir) {
1192         case IPSEC_DIR_INBOUND:
1193                 pcb_sp = &in6p->in6p_sp->sp_in;
1194                 break;
1195         case IPSEC_DIR_OUTBOUND:
1196                 pcb_sp = &in6p->in6p_sp->sp_out;
1197                 break;
1198         default:
1199                 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1200                         xpl->sadb_x_policy_dir));
1201                 return EINVAL;
1202         }
1203
1204         return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1205 }
1206
1207 int
1208 ipsec6_get_policy(in6p, request, len, mp)
1209         struct in6pcb *in6p;
1210         caddr_t request;
1211         size_t len;
1212         struct mbuf **mp;
1213 {
1214         struct sadb_x_policy *xpl;
1215         struct secpolicy *pcb_sp;
1216
1217         /* sanity check. */
1218         if (in6p == NULL || request == NULL || mp == NULL)
1219                 return EINVAL;
1220         IPSEC_ASSERT(in6p->in6p_sp != NULL, ("null in6p_sp"));
1221         if (len < sizeof(*xpl))
1222                 return EINVAL;
1223         xpl = (struct sadb_x_policy *)request;
1224
1225         /* select direction */
1226         switch (xpl->sadb_x_policy_dir) {
1227         case IPSEC_DIR_INBOUND:
1228                 pcb_sp = in6p->in6p_sp->sp_in;
1229                 break;
1230         case IPSEC_DIR_OUTBOUND:
1231                 pcb_sp = in6p->in6p_sp->sp_out;
1232                 break;
1233         default:
1234                 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1235                         xpl->sadb_x_policy_dir));
1236                 return EINVAL;
1237         }
1238
1239         return ipsec_get_policy(pcb_sp, mp);
1240 }
1241
1242 int
1243 ipsec6_delete_pcbpolicy(in6p)
1244         struct in6pcb *in6p;
1245 {
1246         IPSEC_ASSERT(in6p != NULL, ("null in6p"));
1247
1248         if (in6p->in6p_sp == NULL)
1249                 return 0;
1250
1251         if (in6p->in6p_sp->sp_in != NULL)
1252                 KEY_FREESP(&in6p->in6p_sp->sp_in);
1253
1254         if (in6p->in6p_sp->sp_out != NULL)
1255                 KEY_FREESP(&in6p->in6p_sp->sp_out);
1256
1257         ipsec_delpcbpolicy(in6p->in6p_sp);
1258         in6p->in6p_sp = NULL;
1259
1260         return 0;
1261 }
1262 #endif
1263
1264 /*
1265  * return current level.
1266  * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
1267  */
1268 u_int
1269 ipsec_get_reqlevel(isr)
1270         struct ipsecrequest *isr;
1271 {
1272         u_int level = 0;
1273         u_int esp_trans_deflev, esp_net_deflev;
1274         u_int ah_trans_deflev, ah_net_deflev;
1275
1276         IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument"));
1277         IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
1278                 ("af family mismatch, src %u, dst %u",
1279                  isr->sp->spidx.src.sa.sa_family,
1280                  isr->sp->spidx.dst.sa.sa_family));
1281
1282 /* XXX note that we have ipseclog() expanded here - code sync issue */
1283 #define IPSEC_CHECK_DEFAULT(lev) \
1284         (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE            \
1285                         && (lev) != IPSEC_LEVEL_UNIQUE)                       \
1286                 ? (ipsec_debug                                                \
1287                         ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
1288                                 (lev), IPSEC_LEVEL_REQUIRE)                   \
1289                         : 0),                                                 \
1290                         (lev) = IPSEC_LEVEL_REQUIRE,                          \
1291                         (lev)                                                 \
1292                 : (lev))
1293
1294         /* set default level */
1295         switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
1296 #ifdef INET
1297         case AF_INET:
1298                 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
1299                 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
1300                 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
1301                 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
1302                 break;
1303 #endif
1304 #ifdef INET6
1305         case AF_INET6:
1306                 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
1307                 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
1308                 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
1309                 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
1310                 break;
1311 #endif /* INET6 */
1312         default:
1313                 panic("%s: unknown af %u",
1314                         __func__, isr->sp->spidx.src.sa.sa_family);
1315         }
1316
1317 #undef IPSEC_CHECK_DEFAULT
1318
1319         /* set level */
1320         switch (isr->level) {
1321         case IPSEC_LEVEL_DEFAULT:
1322                 switch (isr->saidx.proto) {
1323                 case IPPROTO_ESP:
1324                         if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1325                                 level = esp_net_deflev;
1326                         else
1327                                 level = esp_trans_deflev;
1328                         break;
1329                 case IPPROTO_AH:
1330                         if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1331                                 level = ah_net_deflev;
1332                         else
1333                                 level = ah_trans_deflev;
1334                         break;
1335                 case IPPROTO_IPCOMP:
1336                         /*
1337                          * we don't really care, as IPcomp document says that
1338                          * we shouldn't compress small packets
1339                          */
1340                         level = IPSEC_LEVEL_USE;
1341                         break;
1342                 default:
1343                         panic("%s: Illegal protocol defined %u\n", __func__,
1344                                 isr->saidx.proto);
1345                 }
1346                 break;
1347
1348         case IPSEC_LEVEL_USE:
1349         case IPSEC_LEVEL_REQUIRE:
1350                 level = isr->level;
1351                 break;
1352         case IPSEC_LEVEL_UNIQUE:
1353                 level = IPSEC_LEVEL_REQUIRE;
1354                 break;
1355
1356         default:
1357                 panic("%s: Illegal IPsec level %u\n", __func__, isr->level);
1358         }
1359
1360         return level;
1361 }
1362
1363 /*
1364  * Check security policy requirements against the actual
1365  * packet contents.  Return one if the packet should be
1366  * reject as "invalid"; otherwiser return zero to have the
1367  * packet treated as "valid".
1368  *
1369  * OUT:
1370  *      0: valid
1371  *      1: invalid
1372  */
1373 int
1374 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
1375 {
1376         struct ipsecrequest *isr;
1377         int need_auth;
1378
1379         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1380                 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp));
1381
1382         /* check policy */
1383         switch (sp->policy) {
1384         case IPSEC_POLICY_DISCARD:
1385                 return 1;
1386         case IPSEC_POLICY_BYPASS:
1387         case IPSEC_POLICY_NONE:
1388                 return 0;
1389         }
1390
1391         IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1392                 ("invalid policy %u", sp->policy));
1393
1394         /* XXX should compare policy against ipsec header history */
1395
1396         need_auth = 0;
1397         for (isr = sp->req; isr != NULL; isr = isr->next) {
1398                 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
1399                         continue;
1400                 switch (isr->saidx.proto) {
1401                 case IPPROTO_ESP:
1402                         if ((m->m_flags & M_DECRYPTED) == 0) {
1403                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1404                                     printf("%s: ESP m_flags:%x\n", __func__,
1405                                             m->m_flags));
1406                                 return 1;
1407                         }
1408
1409                         if (!need_auth &&
1410                             isr->sav != NULL &&
1411                             isr->sav->tdb_authalgxform != NULL &&
1412                             (m->m_flags & M_AUTHIPDGM) == 0) {
1413                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1414                                     printf("%s: ESP/AH m_flags:%x\n", __func__,
1415                                             m->m_flags));
1416                                 return 1;
1417                         }
1418                         break;
1419                 case IPPROTO_AH:
1420                         need_auth = 1;
1421                         if ((m->m_flags & M_AUTHIPHDR) == 0) {
1422                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1423                                     printf("%s: AH m_flags:%x\n", __func__,
1424                                             m->m_flags));
1425                                 return 1;
1426                         }
1427                         break;
1428                 case IPPROTO_IPCOMP:
1429                         /*
1430                          * we don't really care, as IPcomp document
1431                          * says that we shouldn't compress small
1432                          * packets, IPComp policy should always be
1433                          * treated as being in "use" level.
1434                          */
1435                         break;
1436                 }
1437         }
1438         return 0;               /* valid */
1439 }
1440
1441 /*
1442  * Check AH/ESP integrity.
1443  * This function is called from tcp_input(), udp_input(),
1444  * and {ah,esp}4_input for tunnel mode
1445  */
1446 int
1447 ipsec4_in_reject(m, inp)
1448         struct mbuf *m;
1449         struct inpcb *inp;
1450 {
1451         struct secpolicy *sp;
1452         int error;
1453         int result;
1454
1455         IPSEC_ASSERT(m != NULL, ("null mbuf"));
1456
1457         /* get SP for this packet.
1458          * When we are called from ip_forward(), we call
1459          * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1460          */
1461         if (inp == NULL)
1462                 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1463         else
1464                 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1465
1466         if (sp != NULL) {
1467                 result = ipsec_in_reject(sp, m);
1468                 if (result)
1469                         ipsec4stat.ips_in_polvio++;
1470                 KEY_FREESP(&sp);
1471         } else {
1472                 result = 0;     /* XXX should be panic ?
1473                                  * -> No, there may be error. */
1474         }
1475         return result;
1476 }
1477
1478 #ifdef INET6
1479 /*
1480  * Check AH/ESP integrity.
1481  * This function is called from tcp6_input(), udp6_input(),
1482  * and {ah,esp}6_input for tunnel mode
1483  */
1484 int
1485 ipsec6_in_reject(m, inp)
1486         struct mbuf *m;
1487         struct inpcb *inp;
1488 {
1489         struct secpolicy *sp = NULL;
1490         int error;
1491         int result;
1492
1493         /* sanity check */
1494         if (m == NULL)
1495                 return 0;       /* XXX should be panic ? */
1496
1497         /* get SP for this packet.
1498          * When we are called from ip_forward(), we call
1499          * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1500          */
1501         if (inp == NULL)
1502                 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1503         else
1504                 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1505
1506         if (sp != NULL) {
1507                 result = ipsec_in_reject(sp, m);
1508                 if (result)
1509                         ipsec6stat.ips_in_polvio++;
1510                 KEY_FREESP(&sp);
1511         } else {
1512                 result = 0;
1513         }
1514         return result;
1515 }
1516 #endif
1517
1518 /*
1519  * compute the byte size to be occupied by IPsec header.
1520  * in case it is tunneled, it includes the size of outer IP header.
1521  * NOTE: SP passed is free in this function.
1522  */
1523 static size_t
1524 ipsec_hdrsiz(struct secpolicy *sp)
1525 {
1526         struct ipsecrequest *isr;
1527         size_t siz;
1528
1529         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1530                 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp));
1531
1532         switch (sp->policy) {
1533         case IPSEC_POLICY_DISCARD:
1534         case IPSEC_POLICY_BYPASS:
1535         case IPSEC_POLICY_NONE:
1536                 return 0;
1537         }
1538
1539         IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1540                 ("invalid policy %u", sp->policy));
1541
1542         siz = 0;
1543         for (isr = sp->req; isr != NULL; isr = isr->next) {
1544                 size_t clen = 0;
1545
1546                 switch (isr->saidx.proto) {
1547                 case IPPROTO_ESP:
1548                         clen = esp_hdrsiz(isr->sav);
1549                         break;
1550                 case IPPROTO_AH:
1551                         clen = ah_hdrsiz(isr->sav);
1552                         break;
1553                 case IPPROTO_IPCOMP:
1554                         clen = sizeof(struct ipcomp);
1555                         break;
1556                 }
1557
1558                 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
1559                         switch (isr->saidx.dst.sa.sa_family) {
1560                         case AF_INET:
1561                                 clen += sizeof(struct ip);
1562                                 break;
1563 #ifdef INET6
1564                         case AF_INET6:
1565                                 clen += sizeof(struct ip6_hdr);
1566                                 break;
1567 #endif
1568                         default:
1569                                 ipseclog((LOG_ERR, "%s: unknown AF %d in "
1570                                     "IPsec tunnel SA\n", __func__,
1571                                     ((struct sockaddr *)&isr->saidx.dst)->sa_family));
1572                                 break;
1573                         }
1574                 }
1575                 siz += clen;
1576         }
1577
1578         return siz;
1579 }
1580
1581 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
1582 size_t
1583 ipsec4_hdrsiz(m, dir, inp)
1584         struct mbuf *m;
1585         u_int dir;
1586         struct inpcb *inp;
1587 {
1588         struct secpolicy *sp;
1589         int error;
1590         size_t size;
1591
1592         IPSEC_ASSERT(m != NULL, ("null mbuf"));
1593
1594         /* get SP for this packet.
1595          * When we are called from ip_forward(), we call
1596          * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1597          */
1598         if (inp == NULL)
1599                 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1600         else
1601                 sp = ipsec_getpolicybysock(m, dir, inp, &error);
1602
1603         if (sp != NULL) {
1604                 size = ipsec_hdrsiz(sp);
1605                 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1606                         printf("%s: size:%lu.\n", __func__,
1607                                 (unsigned long)size));
1608
1609                 KEY_FREESP(&sp);
1610         } else {
1611                 size = 0;       /* XXX should be panic ?
1612                                  * -> No, we are called w/o knowing if
1613                                  *    IPsec processing is needed. */
1614         }
1615         return size;
1616 }
1617
1618 #ifdef INET6
1619 /* This function is called from ipsec6_hdrsize_tcp(),
1620  * and maybe from ip6_forward.()
1621  */
1622 size_t
1623 ipsec6_hdrsiz(m, dir, in6p)
1624         struct mbuf *m;
1625         u_int dir;
1626         struct in6pcb *in6p;
1627 {
1628         struct secpolicy *sp;
1629         int error;
1630         size_t size;
1631
1632         IPSEC_ASSERT(m != NULL, ("null mbuf"));
1633         IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL,
1634                 ("socket w/o inpcb"));
1635
1636         /* get SP for this packet */
1637         /* XXX Is it right to call with IP_FORWARDING. */
1638         if (in6p == NULL)
1639                 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1640         else
1641                 sp = ipsec_getpolicybysock(m, dir, in6p, &error);
1642
1643         if (sp == NULL)
1644                 return 0;
1645         size = ipsec_hdrsiz(sp);
1646         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1647                 printf("%s: size:%lu.\n", __func__, (unsigned long)size));
1648         KEY_FREESP(&sp);
1649
1650         return size;
1651 }
1652 #endif /*INET6*/
1653
1654 /*
1655  * Check the variable replay window.
1656  * ipsec_chkreplay() performs replay check before ICV verification.
1657  * ipsec_updatereplay() updates replay bitmap.  This must be called after
1658  * ICV verification (it also performs replay check, which is usually done
1659  * beforehand).
1660  * 0 (zero) is returned if packet disallowed, 1 if packet permitted.
1661  *
1662  * based on RFC 2401.
1663  */
1664 int
1665 ipsec_chkreplay(seq, sav)
1666         u_int32_t seq;
1667         struct secasvar *sav;
1668 {
1669         const struct secreplay *replay;
1670         u_int32_t diff;
1671         int fr;
1672         u_int32_t wsizeb;       /* constant: bits of window size */
1673         int frlast;             /* constant: last frame */
1674
1675         IPSEC_SPLASSERT_SOFTNET(__func__);
1676
1677         IPSEC_ASSERT(sav != NULL, ("Null SA"));
1678         IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
1679
1680         replay = sav->replay;
1681
1682         if (replay->wsize == 0)
1683                 return 1;       /* no need to check replay. */
1684
1685         /* constant */
1686         frlast = replay->wsize - 1;
1687         wsizeb = replay->wsize << 3;
1688
1689         /* sequence number of 0 is invalid */
1690         if (seq == 0)
1691                 return 0;
1692
1693         /* first time is always okay */
1694         if (replay->count == 0)
1695                 return 1;
1696
1697         if (seq > replay->lastseq) {
1698                 /* larger sequences are okay */
1699                 return 1;
1700         } else {
1701                 /* seq is equal or less than lastseq. */
1702                 diff = replay->lastseq - seq;
1703
1704                 /* over range to check, i.e. too old or wrapped */
1705                 if (diff >= wsizeb)
1706                         return 0;
1707
1708                 fr = frlast - diff / 8;
1709
1710                 /* this packet already seen ? */
1711                 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1712                         return 0;
1713
1714                 /* out of order but good */
1715                 return 1;
1716         }
1717 }
1718
1719 /*
1720  * check replay counter whether to update or not.
1721  * OUT: 0:      OK
1722  *      1:      NG
1723  */
1724 int
1725 ipsec_updatereplay(seq, sav)
1726         u_int32_t seq;
1727         struct secasvar *sav;
1728 {
1729         struct secreplay *replay;
1730         u_int32_t diff;
1731         int fr;
1732         u_int32_t wsizeb;       /* constant: bits of window size */
1733         int frlast;             /* constant: last frame */
1734
1735         IPSEC_SPLASSERT_SOFTNET(__func__);
1736
1737         IPSEC_ASSERT(sav != NULL, ("Null SA"));
1738         IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
1739
1740         replay = sav->replay;
1741
1742         if (replay->wsize == 0)
1743                 goto ok;        /* no need to check replay. */
1744
1745         /* constant */
1746         frlast = replay->wsize - 1;
1747         wsizeb = replay->wsize << 3;
1748
1749         /* sequence number of 0 is invalid */
1750         if (seq == 0)
1751                 return 1;
1752
1753         /* first time */
1754         if (replay->count == 0) {
1755                 replay->lastseq = seq;
1756                 bzero(replay->bitmap, replay->wsize);
1757                 (replay->bitmap)[frlast] = 1;
1758                 goto ok;
1759         }
1760
1761         if (seq > replay->lastseq) {
1762                 /* seq is larger than lastseq. */
1763                 diff = seq - replay->lastseq;
1764
1765                 /* new larger sequence number */
1766                 if (diff < wsizeb) {
1767                         /* In window */
1768                         /* set bit for this packet */
1769                         vshiftl(replay->bitmap, diff, replay->wsize);
1770                         (replay->bitmap)[frlast] |= 1;
1771                 } else {
1772                         /* this packet has a "way larger" */
1773                         bzero(replay->bitmap, replay->wsize);
1774                         (replay->bitmap)[frlast] = 1;
1775                 }
1776                 replay->lastseq = seq;
1777
1778                 /* larger is good */
1779         } else {
1780                 /* seq is equal or less than lastseq. */
1781                 diff = replay->lastseq - seq;
1782
1783                 /* over range to check, i.e. too old or wrapped */
1784                 if (diff >= wsizeb)
1785                         return 1;
1786
1787                 fr = frlast - diff / 8;
1788
1789                 /* this packet already seen ? */
1790                 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1791                         return 1;
1792
1793                 /* mark as seen */
1794                 (replay->bitmap)[fr] |= (1 << (diff % 8));
1795
1796                 /* out of order but good */
1797         }
1798
1799 ok:
1800         if (replay->count == ~0) {
1801
1802                 /* set overflow flag */
1803                 replay->overflow++;
1804
1805                 /* don't increment, no more packets accepted */
1806                 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
1807                         return 1;
1808
1809                 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n",
1810                     __func__, replay->overflow, ipsec_logsastr(sav)));
1811         }
1812
1813         replay->count++;
1814
1815         return 0;
1816 }
1817
1818 /*
1819  * shift variable length buffer to left.
1820  * IN:  bitmap: pointer to the buffer
1821  *      nbit:   the number of to shift.
1822  *      wsize:  buffer size (bytes).
1823  */
1824 static void
1825 vshiftl(bitmap, nbit, wsize)
1826         unsigned char *bitmap;
1827         int nbit, wsize;
1828 {
1829         int s, j, i;
1830         unsigned char over;
1831
1832         for (j = 0; j < nbit; j += 8) {
1833                 s = (nbit - j < 8) ? (nbit - j): 8;
1834                 bitmap[0] <<= s;
1835                 for (i = 1; i < wsize; i++) {
1836                         over = (bitmap[i] >> (8 - s));
1837                         bitmap[i] <<= s;
1838                         bitmap[i-1] |= over;
1839                 }
1840         }
1841
1842         return;
1843 }
1844
1845 /* Return a printable string for the IPv4 address. */
1846 static char *
1847 inet_ntoa4(struct in_addr ina)
1848 {
1849         static char buf[4][4 * sizeof "123" + 4];
1850         unsigned char *ucp = (unsigned char *) &ina;
1851         static int i = 3;
1852
1853         /* XXX-BZ returns static buffer. */
1854         i = (i + 1) % 4;
1855         sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff,
1856             ucp[2] & 0xff, ucp[3] & 0xff);
1857         return (buf[i]);
1858 }
1859
1860 /* Return a printable string for the address. */
1861 char *
1862 ipsec_address(union sockaddr_union* sa)
1863 {
1864 #ifdef INET6
1865         char ip6buf[INET6_ADDRSTRLEN];
1866 #endif
1867         switch (sa->sa.sa_family) {
1868 #ifdef INET
1869         case AF_INET:
1870                 return inet_ntoa4(sa->sin.sin_addr);
1871 #endif /* INET */
1872
1873 #ifdef INET6
1874         case AF_INET6:
1875                 return ip6_sprintf(ip6buf, &sa->sin6.sin6_addr);
1876 #endif /* INET6 */
1877
1878         default:
1879                 return "(unknown address family)";
1880         }
1881 }
1882
1883 const char *
1884 ipsec_logsastr(sav)
1885         struct secasvar *sav;
1886 {
1887         static char buf[256];
1888         char *p;
1889         struct secasindex *saidx = &sav->sah->saidx;
1890
1891         IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
1892                 ("address family mismatch"));
1893
1894         p = buf;
1895         snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
1896         while (p && *p)
1897                 p++;
1898         /* NB: only use ipsec_address on one address at a time */
1899         snprintf(p, sizeof (buf) - (p - buf), "src=%s ",
1900                 ipsec_address(&saidx->src));
1901         while (p && *p)
1902                 p++;
1903         snprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
1904                 ipsec_address(&saidx->dst));
1905
1906         return buf;
1907 }
1908
1909 void
1910 ipsec_dumpmbuf(m)
1911         struct mbuf *m;
1912 {
1913         int totlen;
1914         int i;
1915         u_char *p;
1916
1917         totlen = 0;
1918         printf("---\n");
1919         while (m) {
1920                 p = mtod(m, u_char *);
1921                 for (i = 0; i < m->m_len; i++) {
1922                         printf("%02x ", p[i]);
1923                         totlen++;
1924                         if (totlen % 16 == 0)
1925                                 printf("\n");
1926                 }
1927                 m = m->m_next;
1928         }
1929         if (totlen % 16 != 0)
1930                 printf("\n");
1931         printf("---\n");
1932 }
1933
1934 static void
1935 ipsec_attach(void)
1936 {
1937         SECPOLICY_LOCK_INIT(&ip4_def_policy);
1938         ip4_def_policy.refcnt = 1;                      /* NB: disallow free */
1939 }
1940 SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL)
1941
1942
1943 /* XXX this stuff doesn't belong here... */
1944
1945 static  struct xformsw* xforms = NULL;
1946
1947 /*
1948  * Register a transform; typically at system startup.
1949  */
1950 void
1951 xform_register(struct xformsw* xsp)
1952 {
1953         xsp->xf_next = xforms;
1954         xforms = xsp;
1955 }
1956
1957 /*
1958  * Initialize transform support in an sav.
1959  */
1960 int
1961 xform_init(struct secasvar *sav, int xftype)
1962 {
1963         struct xformsw *xsp;
1964
1965         if (sav->tdb_xform != NULL)     /* previously initialized */
1966                 return 0;
1967         for (xsp = xforms; xsp; xsp = xsp->xf_next)
1968                 if (xsp->xf_type == xftype)
1969                         return (*xsp->xf_init)(sav, xsp);
1970         return EINVAL;
1971 }