sys/netinet6/ipsec.c

   1 /*      $FreeBSD: src/sys/netinet6/ipsec.c,v 1.3.2.12 2003/05/06 06:46:58 suz Exp $     */
   2 /*      $DragonFly: src/sys/netinet6/ipsec.c,v 1.5 2004/02/14 21:15:31 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/ip_ecn.h>
  69 #ifdef INET6
  70 #include <netinet6/ip6_ecn.h>
  71 #endif
  72 #include <netinet/tcp.h>
  73 #include <netinet/udp.h>
  74
  75 #include <netinet/ip6.h>
  76 #ifdef INET6
  77 #include <netinet6/ip6_var.h>
  78 #endif
  79 #include <netinet/in_pcb.h>
  80 #ifdef INET6
  81 #include <netinet/icmp6.h>
  82 #endif
  83
  84 #include <netinet6/ipsec.h>
  85 #ifdef INET6
  86 #include <netinet6/ipsec6.h>
  87 #endif
  88 #include <netinet6/ah.h>
  89 #ifdef INET6
  90 #include <netinet6/ah6.h>
  91 #endif
  92 #ifdef IPSEC_ESP
  93 #include <netinet6/esp.h>
  94 #ifdef INET6
  95 #include <netinet6/esp6.h>
  96 #endif
  97 #endif
  98 #include <netinet6/ipcomp.h>
  99 #ifdef INET6
 100 #include <netinet6/ipcomp6.h>
 101 #endif
 102 #include <netproto/key/key.h>
 103 #include <netproto/key/keydb.h>
 104 #include <netproto/key/key_debug.h>
 105
 106 #include <net/net_osdep.h>
 107
 108 #ifdef IPSEC_DEBUG
 109 int ipsec_debug = 1;
 110 #else
 111 int ipsec_debug = 0;
 112 #endif
 113
 114 struct ipsecstat ipsecstat;
 115 int ip4_ah_cleartos = 1;
 116 int ip4_ah_offsetmask = 0;      /* maybe IP_DF? */
 117 int ip4_ipsec_dfbit = 0;        /* DF bit on encap. 0: clear 1: set 2: copy */
 118 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE;
 119 int ip4_esp_net_deflev = IPSEC_LEVEL_USE;
 120 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE;
 121 int ip4_ah_net_deflev = IPSEC_LEVEL_USE;
 122 struct secpolicy ip4_def_policy;
 123 int ip4_ipsec_ecn = 0;          /* ECN ignore(-1)/forbidden(0)/allowed(1) */
 124 int ip4_esp_randpad = -1;
 125
 126 #ifdef SYSCTL_DECL
 127 SYSCTL_DECL(_net_inet_ipsec);
 128 #ifdef INET6
 129 SYSCTL_DECL(_net_inet6_ipsec6);
 130 #endif
 131 #endif
 132
 133 /* net.inet.ipsec */
 134 SYSCTL_STRUCT(_net_inet_ipsec, IPSECCTL_STATS,
 135         stats, CTLFLAG_RD,      &ipsecstat,     ipsecstat, "");
 136 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY,
 137         def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
 138 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
 139         CTLFLAG_RW, &ip4_esp_trans_deflev,      0, "");
 140 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
 141         CTLFLAG_RW, &ip4_esp_net_deflev,        0, "");
 142 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
 143         CTLFLAG_RW, &ip4_ah_trans_deflev,       0, "");
 144 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
 145         CTLFLAG_RW, &ip4_ah_net_deflev, 0, "");
 146 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS,
 147         ah_cleartos, CTLFLAG_RW,        &ip4_ah_cleartos,       0, "");
 148 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK,
 149         ah_offsetmask, CTLFLAG_RW,      &ip4_ah_offsetmask,     0, "");
 150 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT,
 151         dfbit, CTLFLAG_RW,      &ip4_ipsec_dfbit,       0, "");
 152 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN,
 153         ecn, CTLFLAG_RW,        &ip4_ipsec_ecn, 0, "");
 154 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG,
 155         debug, CTLFLAG_RW,      &ipsec_debug,   0, "");
 156 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD,
 157         esp_randpad, CTLFLAG_RW,        &ip4_esp_randpad,       0, "");
 158
 159 #ifdef INET6
 160 struct ipsecstat ipsec6stat;
 161 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE;
 162 int ip6_esp_net_deflev = IPSEC_LEVEL_USE;
 163 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
 164 int ip6_ah_net_deflev = IPSEC_LEVEL_USE;
 165 struct secpolicy ip6_def_policy;
 166 int ip6_ipsec_ecn = 0;          /* ECN ignore(-1)/forbidden(0)/allowed(1) */
 167 int ip6_esp_randpad = -1;
 168
 169 /* net.inet6.ipsec6 */
 170 SYSCTL_STRUCT(_net_inet6_ipsec6, IPSECCTL_STATS,
 171         stats, CTLFLAG_RD, &ipsec6stat, ipsecstat, "");
 172 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
 173         def_policy, CTLFLAG_RW, &ip6_def_policy.policy, 0, "");
 174 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
 175         CTLFLAG_RW, &ip6_esp_trans_deflev,      0, "");
 176 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
 177         CTLFLAG_RW, &ip6_esp_net_deflev,        0, "");
 178 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
 179         CTLFLAG_RW, &ip6_ah_trans_deflev,       0, "");
 180 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
 181         CTLFLAG_RW, &ip6_ah_net_deflev, 0, "");
 182 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
 183         ecn, CTLFLAG_RW,        &ip6_ipsec_ecn, 0, "");
 184 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG,
 185         debug, CTLFLAG_RW,      &ipsec_debug,   0, "");
 186 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD,
 187         esp_randpad, CTLFLAG_RW,        &ip6_esp_randpad,       0, "");
 188 #endif /* INET6 */
 189
 190 static int ipsec_setspidx_mbuf
 191         (struct secpolicyindex *, u_int, u_int, struct mbuf *, int);
 192 static int ipsec4_setspidx_inpcb (struct mbuf *, struct inpcb *pcb);
 193 #ifdef INET6
 194 static int ipsec6_setspidx_in6pcb (struct mbuf *, struct in6pcb *pcb);
 195 #endif
 196 static int ipsec_setspidx (struct mbuf *, struct secpolicyindex *, int);
 197 static void ipsec4_get_ulp (struct mbuf *m, struct secpolicyindex *, int);
 198 static int ipsec4_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *);
 199 #ifdef INET6
 200 static void ipsec6_get_ulp (struct mbuf *m, struct secpolicyindex *, int);
 201 static int ipsec6_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *);
 202 #endif
 203 static struct inpcbpolicy *ipsec_newpcbpolicy (void);
 204 static void ipsec_delpcbpolicy (struct inpcbpolicy *);
 205 static struct secpolicy *ipsec_deepcopy_policy (struct secpolicy *src);
 206 static int ipsec_set_policy (struct secpolicy **pcb_sp,
 207         int optname, caddr_t request, size_t len, int priv);
 208 static int ipsec_get_policy (struct secpolicy *pcb_sp, struct mbuf **mp);
 209 static void vshiftl (unsigned char *, int, int);
 210 static int ipsec_in_reject (struct secpolicy *, struct mbuf *);
 211 static size_t ipsec_hdrsiz (struct secpolicy *);
 212 #ifdef INET
 213 static struct mbuf *ipsec4_splithdr (struct mbuf *);
 214 #endif
 215 #ifdef INET6
 216 static struct mbuf *ipsec6_splithdr (struct mbuf *);
 217 #endif
 218 #ifdef INET
 219 static int ipsec4_encapsulate (struct mbuf *, struct secasvar *);
 220 #endif
 221 #ifdef INET6
 222 static int ipsec6_encapsulate (struct mbuf *, struct secasvar *);
 223 #endif
 224
 225 /*
 226  * For OUTBOUND packet having a socket. Searching SPD for packet,
 227  * and return a pointer to SP.
 228  * OUT: NULL:   no apropreate SP found, the following value is set to error.
 229  *              0       : bypass
 230  *              EACCES  : discard packet.
 231  *              ENOENT  : ipsec_acquire() in progress, maybe.
 232  *              others  : error occured.
 233  *      others: a pointer to SP
 234  *
 235  * NOTE: IPv6 mapped adddress concern is implemented here.
 236  */
 237 struct secpolicy *
 238 ipsec4_getpolicybysock(m, dir, so, error)
 239         struct mbuf *m;
 240         u_int dir;
 241         struct socket *so;
 242         int *error;
 243 {
 244         struct inpcbpolicy *pcbsp = NULL;
 245         struct secpolicy *currsp = NULL;        /* policy on socket */
 246         struct secpolicy *kernsp = NULL;        /* policy on kernel */
 247
 248         /* sanity check */
 249         if (m == NULL || so == NULL || error == NULL)
 250                 panic("ipsec4_getpolicybysock: NULL pointer was passed.");
 251
 252         switch (so->so_proto->pr_domain->dom_family) {
 253         case AF_INET:
 254                 /* set spidx in pcb */
 255                 *error = ipsec4_setspidx_inpcb(m, sotoinpcb(so));
 256                 break;
 257 #ifdef INET6
 258         case AF_INET6:
 259                 /* set spidx in pcb */
 260                 *error = ipsec6_setspidx_in6pcb(m, sotoin6pcb(so));
 261                 break;
 262 #endif
 263         default:
 264                 panic("ipsec4_getpolicybysock: unsupported address family\n");
 265         }
 266         if (*error)
 267                 return NULL;
 268         switch (so->so_proto->pr_domain->dom_family) {
 269         case AF_INET:
 270                 pcbsp = sotoinpcb(so)->inp_sp;
 271                 break;
 272 #ifdef INET6
 273         case AF_INET6:
 274                 pcbsp = sotoin6pcb(so)->in6p_sp;
 275                 break;
 276 #endif
 277         }
 278
 279         /* sanity check */
 280         if (pcbsp == NULL)
 281                 panic("ipsec4_getpolicybysock: pcbsp is NULL.");
 282
 283         switch (dir) {
 284         case IPSEC_DIR_INBOUND:
 285                 currsp = pcbsp->sp_in;
 286                 break;
 287         case IPSEC_DIR_OUTBOUND:
 288                 currsp = pcbsp->sp_out;
 289                 break;
 290         default:
 291                 panic("ipsec4_getpolicybysock: illegal direction.");
 292         }
 293
 294         /* sanity check */
 295         if (currsp == NULL)
 296                 panic("ipsec4_getpolicybysock: currsp is NULL.");
 297
 298         /* when privilieged socket */
 299         if (pcbsp->priv) {
 300                 switch (currsp->policy) {
 301                 case IPSEC_POLICY_BYPASS:
 302                         currsp->refcnt++;
 303                         *error = 0;
 304                         return currsp;
 305
 306                 case IPSEC_POLICY_ENTRUST:
 307                         /* look for a policy in SPD */
 308                         kernsp = key_allocsp(&currsp->spidx, dir);
 309
 310                         /* SP found */
 311                         if (kernsp != NULL) {
 312                                 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 313                                         printf("DP ipsec4_getpolicybysock called "
 314                                                "to allocate SP:%p\n", kernsp));
 315                                 *error = 0;
 316                                 return kernsp;
 317                         }
 318
 319                         /* no SP found */
 320                         if (ip4_def_policy.policy != IPSEC_POLICY_DISCARD
 321                          && ip4_def_policy.policy != IPSEC_POLICY_NONE) {
 322                                 ipseclog((LOG_INFO,
 323                                     "fixed system default policy: %d->%d\n",
 324                                     ip4_def_policy.policy, IPSEC_POLICY_NONE));
 325                                 ip4_def_policy.policy = IPSEC_POLICY_NONE;
 326                         }
 327                         ip4_def_policy.refcnt++;
 328                         *error = 0;
 329                         return &ip4_def_policy;
 330
 331                 case IPSEC_POLICY_IPSEC:
 332                         currsp->refcnt++;
 333                         *error = 0;
 334                         return currsp;
 335
 336                 default:
 337                         ipseclog((LOG_ERR, "ipsec4_getpolicybysock: "
 338                               "Invalid policy for PCB %d\n", currsp->policy));
 339                         *error = EINVAL;
 340                         return NULL;
 341                 }
 342                 /* NOTREACHED */
 343         }
 344
 345         /* when non-privilieged socket */
 346         /* look for a policy in SPD */
 347         kernsp = key_allocsp(&currsp->spidx, dir);
 348
 349         /* SP found */
 350         if (kernsp != NULL) {
 351                 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 352                         printf("DP ipsec4_getpolicybysock called "
 353                                "to allocate SP:%p\n", kernsp));
 354                 *error = 0;
 355                 return kernsp;
 356         }
 357
 358         /* no SP found */
 359         switch (currsp->policy) {
 360         case IPSEC_POLICY_BYPASS:
 361                 ipseclog((LOG_ERR, "ipsec4_getpolicybysock: "
 362                        "Illegal policy for non-priviliged defined %d\n",
 363                         currsp->policy));
 364                 *error = EINVAL;
 365                 return NULL;
 366
 367         case IPSEC_POLICY_ENTRUST:
 368                 if (ip4_def_policy.policy != IPSEC_POLICY_DISCARD
 369                  && ip4_def_policy.policy != IPSEC_POLICY_NONE) {
 370                         ipseclog((LOG_INFO,
 371                             "fixed system default policy: %d->%d\n",
 372                             ip4_def_policy.policy, IPSEC_POLICY_NONE));
 373                         ip4_def_policy.policy = IPSEC_POLICY_NONE;
 374                 }
 375                 ip4_def_policy.refcnt++;
 376                 *error = 0;
 377                 return &ip4_def_policy;
 378
 379         case IPSEC_POLICY_IPSEC:
 380                 currsp->refcnt++;
 381                 *error = 0;
 382                 return currsp;
 383
 384         default:
 385                 ipseclog((LOG_ERR, "ipsec4_getpolicybysock: "
 386                    "Invalid policy for PCB %d\n", currsp->policy));
 387                 *error = EINVAL;
 388                 return NULL;
 389         }
 390         /* NOTREACHED */
 391 }
 392
 393 /*
 394  * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
 395  * and return a pointer to SP.
 396  * OUT: positive: a pointer to the entry for security policy leaf matched.
 397  *      NULL:   no apropreate SP found, the following value is set to error.
 398  *              0       : bypass
 399  *              EACCES  : discard packet.
 400  *              ENOENT  : ipsec_acquire() in progress, maybe.
 401  *              others  : error occured.
 402  */
 403 struct secpolicy *
 404 ipsec4_getpolicybyaddr(m, dir, flag, error)
 405         struct mbuf *m;
 406         u_int dir;
 407         int flag;
 408         int *error;
 409 {
 410         struct secpolicy *sp = NULL;
 411
 412         /* sanity check */
 413         if (m == NULL || error == NULL)
 414                 panic("ipsec4_getpolicybyaddr: NULL pointer was passed.");
 415
 416     {
 417         struct secpolicyindex spidx;
 418
 419         bzero(&spidx, sizeof(spidx));
 420
 421         /* make a index to look for a policy */
 422         *error = ipsec_setspidx_mbuf(&spidx, dir, AF_INET, m,
 423             (flag & IP_FORWARDING) ? 0 : 1);
 424
 425         if (*error != 0)
 426                 return NULL;
 427
 428         sp = key_allocsp(&spidx, dir);
 429     }
 430
 431         /* SP found */
 432         if (sp != NULL) {
 433                 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 434                         printf("DP ipsec4_getpolicybyaddr called "
 435                                "to allocate SP:%p\n", sp));
 436                 *error = 0;
 437                 return sp;
 438         }
 439
 440         /* no SP found */
 441         if (ip4_def_policy.policy != IPSEC_POLICY_DISCARD
 442          && ip4_def_policy.policy != IPSEC_POLICY_NONE) {
 443                 ipseclog((LOG_INFO, "fixed system default policy:%d->%d\n",
 444                         ip4_def_policy.policy,
 445                         IPSEC_POLICY_NONE));
 446                 ip4_def_policy.policy = IPSEC_POLICY_NONE;
 447         }
 448         ip4_def_policy.refcnt++;
 449         *error = 0;
 450         return &ip4_def_policy;
 451 }
 452
 453 #ifdef INET6
 454 /*
 455  * For OUTBOUND packet having a socket. Searching SPD for packet,
 456  * and return a pointer to SP.
 457  * OUT: NULL:   no apropreate SP found, the following value is set to error.
 458  *              0       : bypass
 459  *              EACCES  : discard packet.
 460  *              ENOENT  : ipsec_acquire() in progress, maybe.
 461  *              others  : error occured.
 462  *      others: a pointer to SP
 463  */
 464 struct secpolicy *
 465 ipsec6_getpolicybysock(m, dir, so, error)
 466         struct mbuf *m;
 467         u_int dir;
 468         struct socket *so;
 469         int *error;
 470 {
 471         struct inpcbpolicy *pcbsp = NULL;
 472         struct secpolicy *currsp = NULL;        /* policy on socket */
 473         struct secpolicy *kernsp = NULL;        /* policy on kernel */
 474
 475         /* sanity check */
 476         if (m == NULL || so == NULL || error == NULL)
 477                 panic("ipsec6_getpolicybysock: NULL pointer was passed.");
 478
 479 #ifdef DIAGNOSTIC
 480         if (so->so_proto->pr_domain->dom_family != AF_INET6)
 481                 panic("ipsec6_getpolicybysock: socket domain != inet6");
 482 #endif
 483
 484         /* set spidx in pcb */
 485         ipsec6_setspidx_in6pcb(m, sotoin6pcb(so));
 486
 487         pcbsp = sotoin6pcb(so)->in6p_sp;
 488
 489         /* sanity check */
 490         if (pcbsp == NULL)
 491                 panic("ipsec6_getpolicybysock: pcbsp is NULL.");
 492
 493         switch (dir) {
 494         case IPSEC_DIR_INBOUND:
 495                 currsp = pcbsp->sp_in;
 496                 break;
 497         case IPSEC_DIR_OUTBOUND:
 498                 currsp = pcbsp->sp_out;
 499                 break;
 500         default:
 501                 panic("ipsec6_getpolicybysock: illegal direction.");
 502         }
 503
 504         /* sanity check */
 505         if (currsp == NULL)
 506                 panic("ipsec6_getpolicybysock: currsp is NULL.");
 507
 508         /* when privilieged socket */
 509         if (pcbsp->priv) {
 510                 switch (currsp->policy) {
 511                 case IPSEC_POLICY_BYPASS:
 512                         currsp->refcnt++;
 513                         *error = 0;
 514                         return currsp;
 515
 516                 case IPSEC_POLICY_ENTRUST:
 517                         /* look for a policy in SPD */
 518                         kernsp = key_allocsp(&currsp->spidx, dir);
 519
 520                         /* SP found */
 521                         if (kernsp != NULL) {
 522                                 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 523                                         printf("DP ipsec6_getpolicybysock called "
 524                                                "to allocate SP:%p\n", kernsp));
 525                                 *error = 0;
 526                                 return kernsp;
 527                         }
 528
 529                         /* no SP found */
 530                         if (ip6_def_policy.policy != IPSEC_POLICY_DISCARD
 531                          && ip6_def_policy.policy != IPSEC_POLICY_NONE) {
 532                                 ipseclog((LOG_INFO,
 533                                     "fixed system default policy: %d->%d\n",
 534                                     ip6_def_policy.policy, IPSEC_POLICY_NONE));
 535                                 ip6_def_policy.policy = IPSEC_POLICY_NONE;
 536                         }
 537                         ip6_def_policy.refcnt++;
 538                         *error = 0;
 539                         return &ip6_def_policy;
 540
 541                 case IPSEC_POLICY_IPSEC:
 542                         currsp->refcnt++;
 543                         *error = 0;
 544                         return currsp;
 545
 546                 default:
 547                         ipseclog((LOG_ERR, "ipsec6_getpolicybysock: "
 548                             "Invalid policy for PCB %d\n", currsp->policy));
 549                         *error = EINVAL;
 550                         return NULL;
 551                 }
 552                 /* NOTREACHED */
 553         }
 554
 555         /* when non-privilieged socket */
 556         /* look for a policy in SPD */
 557         kernsp = key_allocsp(&currsp->spidx, dir);
 558
 559         /* SP found */
 560         if (kernsp != NULL) {
 561                 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 562                         printf("DP ipsec6_getpolicybysock called "
 563                                "to allocate SP:%p\n", kernsp));
 564                 *error = 0;
 565                 return kernsp;
 566         }
 567
 568         /* no SP found */
 569         switch (currsp->policy) {
 570         case IPSEC_POLICY_BYPASS:
 571                 ipseclog((LOG_ERR, "ipsec6_getpolicybysock: "
 572                     "Illegal policy for non-priviliged defined %d\n",
 573                     currsp->policy));
 574                 *error = EINVAL;
 575                 return NULL;
 576
 577         case IPSEC_POLICY_ENTRUST:
 578                 if (ip6_def_policy.policy != IPSEC_POLICY_DISCARD
 579                  && ip6_def_policy.policy != IPSEC_POLICY_NONE) {
 580                         ipseclog((LOG_INFO,
 581                             "fixed system default policy: %d->%d\n",
 582                             ip6_def_policy.policy, IPSEC_POLICY_NONE));
 583                         ip6_def_policy.policy = IPSEC_POLICY_NONE;
 584                 }
 585                 ip6_def_policy.refcnt++;
 586                 *error = 0;
 587                 return &ip6_def_policy;
 588
 589         case IPSEC_POLICY_IPSEC:
 590                 currsp->refcnt++;
 591                 *error = 0;
 592                 return currsp;
 593
 594         default:
 595                 ipseclog((LOG_ERR,
 596                     "ipsec6_policybysock: Invalid policy for PCB %d\n",
 597                     currsp->policy));
 598                 *error = EINVAL;
 599                 return NULL;
 600         }
 601         /* NOTREACHED */
 602 }
 603
 604 /*
 605  * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
 606  * and return a pointer to SP.
 607  * `flag' means that packet is to be forwarded whether or not.
 608  *      flag = 1: forwad
 609  * OUT: positive: a pointer to the entry for security policy leaf matched.
 610  *      NULL:   no apropreate SP found, the following value is set to error.
 611  *              0       : bypass
 612  *              EACCES  : discard packet.
 613  *              ENOENT  : ipsec_acquire() in progress, maybe.
 614  *              others  : error occured.
 615  */
 616 #ifndef IP_FORWARDING
 617 #define IP_FORWARDING 1
 618 #endif
 619
 620 struct secpolicy *
 621 ipsec6_getpolicybyaddr(m, dir, flag, error)
 622         struct mbuf *m;
 623         u_int dir;
 624         int flag;
 625         int *error;
 626 {
 627         struct secpolicy *sp = NULL;
 628
 629         /* sanity check */
 630         if (m == NULL || error == NULL)
 631                 panic("ipsec6_getpolicybyaddr: NULL pointer was passed.");
 632
 633     {
 634         struct secpolicyindex spidx;
 635
 636         bzero(&spidx, sizeof(spidx));
 637
 638         /* make a index to look for a policy */
 639         *error = ipsec_setspidx_mbuf(&spidx, dir, AF_INET6, m,
 640             (flag & IP_FORWARDING) ? 0 : 1);
 641
 642         if (*error != 0)
 643                 return NULL;
 644
 645         sp = key_allocsp(&spidx, dir);
 646     }
 647
 648         /* SP found */
 649         if (sp != NULL) {
 650                 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 651                         printf("DP ipsec6_getpolicybyaddr called "
 652                                "to allocate SP:%p\n", sp));
 653                 *error = 0;
 654                 return sp;
 655         }
 656
 657         /* no SP found */
 658         if (ip6_def_policy.policy != IPSEC_POLICY_DISCARD
 659          && ip6_def_policy.policy != IPSEC_POLICY_NONE) {
 660                 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n",
 661                     ip6_def_policy.policy, IPSEC_POLICY_NONE));
 662                 ip6_def_policy.policy = IPSEC_POLICY_NONE;
 663         }
 664         ip6_def_policy.refcnt++;
 665         *error = 0;
 666         return &ip6_def_policy;
 667 }
 668 #endif /* INET6 */
 669
 670 /*
 671  * set IP address into spidx from mbuf.
 672  * When Forwarding packet and ICMP echo reply, this function is used.
 673  *
 674  * IN:  get the followings from mbuf.
 675  *      protocol family, src, dst, next protocol
 676  * OUT:
 677  *      0:      success.
 678  *      other:  failure, and set errno.
 679  */
 680 int
 681 ipsec_setspidx_mbuf(spidx, dir, family, m, needport)
 682         struct secpolicyindex *spidx;
 683         u_int dir, family;
 684         struct mbuf *m;
 685         int needport;
 686 {
 687         int error;
 688
 689         /* sanity check */
 690         if (spidx == NULL || m == NULL)
 691                 panic("ipsec_setspidx_mbuf: NULL pointer was passed.");
 692
 693         bzero(spidx, sizeof(*spidx));
 694
 695         error = ipsec_setspidx(m, spidx, needport);
 696         if (error)
 697                 goto bad;
 698         spidx->dir = dir;
 699
 700         return 0;
 701
 702     bad:
 703         /* XXX initialize */
 704         bzero(spidx, sizeof(*spidx));
 705         return EINVAL;
 706 }
 707
 708 static int
 709 ipsec4_setspidx_inpcb(m, pcb)
 710         struct mbuf *m;
 711         struct inpcb *pcb;
 712 {
 713         struct secpolicyindex *spidx;
 714         int error;
 715
 716         /* sanity check */
 717         if (pcb == NULL)
 718                 panic("ipsec4_setspidx_inpcb: no PCB found.");
 719         if (pcb->inp_sp == NULL)
 720                 panic("ipsec4_setspidx_inpcb: no inp_sp found.");
 721         if (pcb->inp_sp->sp_out == NULL || pcb->inp_sp->sp_in == NULL)
 722                 panic("ipsec4_setspidx_inpcb: no sp_in/out found.");
 723
 724         bzero(&pcb->inp_sp->sp_in->spidx, sizeof(*spidx));
 725         bzero(&pcb->inp_sp->sp_out->spidx, sizeof(*spidx));
 726
 727         spidx = &pcb->inp_sp->sp_in->spidx;
 728         error = ipsec_setspidx(m, spidx, 1);
 729         if (error)
 730                 goto bad;
 731         spidx->dir = IPSEC_DIR_INBOUND;
 732
 733         spidx = &pcb->inp_sp->sp_out->spidx;
 734         error = ipsec_setspidx(m, spidx, 1);
 735         if (error)
 736                 goto bad;
 737         spidx->dir = IPSEC_DIR_OUTBOUND;
 738
 739         return 0;
 740
 741 bad:
 742         bzero(&pcb->inp_sp->sp_in->spidx, sizeof(*spidx));
 743         bzero(&pcb->inp_sp->sp_out->spidx, sizeof(*spidx));
 744         return error;
 745 }
 746
 747 #ifdef INET6
 748 static int
 749 ipsec6_setspidx_in6pcb(m, pcb)
 750         struct mbuf *m;
 751         struct in6pcb *pcb;
 752 {
 753         struct secpolicyindex *spidx;
 754         int error;
 755
 756         /* sanity check */
 757         if (pcb == NULL)
 758                 panic("ipsec6_setspidx_in6pcb: no PCB found.");
 759         if (pcb->in6p_sp == NULL)
 760                 panic("ipsec6_setspidx_in6pcb: no in6p_sp found.");
 761         if (pcb->in6p_sp->sp_out == NULL || pcb->in6p_sp->sp_in == NULL)
 762                 panic("ipsec6_setspidx_in6pcb: no sp_in/out found.");
 763
 764         bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
 765         bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
 766
 767         spidx = &pcb->in6p_sp->sp_in->spidx;
 768         error = ipsec_setspidx(m, spidx, 1);
 769         if (error)
 770                 goto bad;
 771         spidx->dir = IPSEC_DIR_INBOUND;
 772
 773         spidx = &pcb->in6p_sp->sp_out->spidx;
 774         error = ipsec_setspidx(m, spidx, 1);
 775         if (error)
 776                 goto bad;
 777         spidx->dir = IPSEC_DIR_OUTBOUND;
 778
 779         return 0;
 780
 781 bad:
 782         bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
 783         bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
 784         return error;
 785 }
 786 #endif
 787
 788 /*
 789  * configure security policy index (src/dst/proto/sport/dport)
 790  * by looking at the content of mbuf.
 791  * the caller is responsible for error recovery (like clearing up spidx).
 792  */
 793 static int
 794 ipsec_setspidx(m, spidx, needport)
 795         struct mbuf *m;
 796         struct secpolicyindex *spidx;
 797         int needport;
 798 {
 799         struct ip *ip = NULL;
 800         struct ip ipbuf;
 801         u_int v;
 802         struct mbuf *n;
 803         int len;
 804         int error;
 805
 806         if (m == NULL)
 807                 panic("ipsec_setspidx: m == 0 passed.");
 808
 809         /*
 810          * validate m->m_pkthdr.len.  we see incorrect length if we
 811          * mistakenly call this function with inconsistent mbuf chain
 812          * (like 4.4BSD tcp/udp processing).  XXX should we panic here?
 813          */
 814         len = 0;
 815         for (n = m; n; n = n->m_next)
 816                 len += n->m_len;
 817         if (m->m_pkthdr.len != len) {
 818                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 819                         printf("ipsec_setspidx: "
 820                                "total of m_len(%d) != pkthdr.len(%d), "
 821                                "ignored.\n",
 822                                 len, m->m_pkthdr.len));
 823                 return EINVAL;
 824         }
 825
 826         if (m->m_pkthdr.len < sizeof(struct ip)) {
 827                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 828                         printf("ipsec_setspidx: "
 829                             "pkthdr.len(%d) < sizeof(struct ip), ignored.\n",
 830                             m->m_pkthdr.len));
 831                 return EINVAL;
 832         }
 833
 834         if (m->m_len >= sizeof(*ip))
 835                 ip = mtod(m, struct ip *);
 836         else {
 837                 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
 838                 ip = &ipbuf;
 839         }
 840 #ifdef _IP_VHL
 841         v = _IP_VHL_V(ip->ip_vhl);
 842 #else
 843         v = ip->ip_v;
 844 #endif
 845         switch (v) {
 846         case 4:
 847                 error = ipsec4_setspidx_ipaddr(m, spidx);
 848                 if (error)
 849                         return error;
 850                 ipsec4_get_ulp(m, spidx, needport);
 851                 return 0;
 852 #ifdef INET6
 853         case 6:
 854                 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
 855                         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 856                                 printf("ipsec_setspidx: "
 857                                     "pkthdr.len(%d) < sizeof(struct ip6_hdr), "
 858                                     "ignored.\n", m->m_pkthdr.len));
 859                         return EINVAL;
 860                 }
 861                 error = ipsec6_setspidx_ipaddr(m, spidx);
 862                 if (error)
 863                         return error;
 864                 ipsec6_get_ulp(m, spidx, needport);
 865                 return 0;
 866 #endif
 867         default:
 868                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 869                         printf("ipsec_setspidx: "
 870                             "unknown IP version %u, ignored.\n", v));
 871                 return EINVAL;
 872         }
 873 }
 874
 875 static void
 876 ipsec4_get_ulp(m, spidx, needport)
 877         struct mbuf *m;
 878         struct secpolicyindex *spidx;
 879         int needport;
 880 {
 881         struct ip ip;
 882         struct ip6_ext ip6e;
 883         u_int8_t nxt;
 884         int off;
 885         struct tcphdr th;
 886         struct udphdr uh;
 887
 888         /* sanity check */
 889         if (m == NULL)
 890                 panic("ipsec4_get_ulp: NULL pointer was passed.");
 891         if (m->m_pkthdr.len < sizeof(ip))
 892                 panic("ipsec4_get_ulp: too short");
 893
 894         /* set default */
 895         spidx->ul_proto = IPSEC_ULPROTO_ANY;
 896         ((struct sockaddr_in *)&spidx->src)->sin_port = IPSEC_PORT_ANY;
 897         ((struct sockaddr_in *)&spidx->dst)->sin_port = IPSEC_PORT_ANY;
 898
 899         m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
 900         /* ip_input() flips it into host endian XXX need more checking */
 901         if (ip.ip_off & (IP_MF | IP_OFFMASK))
 902                 return;
 903
 904         nxt = ip.ip_p;
 905 #ifdef _IP_VHL
 906         off = _IP_VHL_HL(ip->ip_vhl) << 2;
 907 #else
 908         off = ip.ip_hl << 2;
 909 #endif
 910         while (off < m->m_pkthdr.len) {
 911                 switch (nxt) {
 912                 case IPPROTO_TCP:
 913                         spidx->ul_proto = nxt;
 914                         if (!needport)
 915                                 return;
 916                         if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
 917                                 return;
 918                         m_copydata(m, off, sizeof(th), (caddr_t)&th);
 919                         ((struct sockaddr_in *)&spidx->src)->sin_port =
 920                             th.th_sport;
 921                         ((struct sockaddr_in *)&spidx->dst)->sin_port =
 922                             th.th_dport;
 923                         return;
 924                 case IPPROTO_UDP:
 925                         spidx->ul_proto = nxt;
 926                         if (!needport)
 927                                 return;
 928                         if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
 929                                 return;
 930                         m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
 931                         ((struct sockaddr_in *)&spidx->src)->sin_port =
 932                             uh.uh_sport;
 933                         ((struct sockaddr_in *)&spidx->dst)->sin_port =
 934                             uh.uh_dport;
 935                         return;
 936                 case IPPROTO_AH:
 937                         if (m->m_pkthdr.len > off + sizeof(ip6e))
 938                                 return;
 939                         m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
 940                         off += (ip6e.ip6e_len + 2) << 2;
 941                         nxt = ip6e.ip6e_nxt;
 942                         break;
 943                 case IPPROTO_ICMP:
 944                 default:
 945                         /* XXX intermediate headers??? */
 946                         spidx->ul_proto = nxt;
 947                         return;
 948                 }
 949         }
 950 }
 951
 952 /* assumes that m is sane */
 953 static int
 954 ipsec4_setspidx_ipaddr(m, spidx)
 955         struct mbuf *m;
 956         struct secpolicyindex *spidx;
 957 {
 958         struct ip *ip = NULL;
 959         struct ip ipbuf;
 960         struct sockaddr_in *sin;
 961
 962         if (m->m_len >= sizeof(*ip))
 963                 ip = mtod(m, struct ip *);
 964         else {
 965                 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
 966                 ip = &ipbuf;
 967         }
 968
 969         sin = (struct sockaddr_in *)&spidx->src;
 970         bzero(sin, sizeof(*sin));
 971         sin->sin_family = AF_INET;
 972         sin->sin_len = sizeof(struct sockaddr_in);
 973         bcopy(&ip->ip_src, &sin->sin_addr, sizeof(ip->ip_src));
 974         spidx->prefs = sizeof(struct in_addr) << 3;
 975
 976         sin = (struct sockaddr_in *)&spidx->dst;
 977         bzero(sin, sizeof(*sin));
 978         sin->sin_family = AF_INET;
 979         sin->sin_len = sizeof(struct sockaddr_in);
 980         bcopy(&ip->ip_dst, &sin->sin_addr, sizeof(ip->ip_dst));
 981         spidx->prefd = sizeof(struct in_addr) << 3;
 982         return 0;
 983 }
 984
 985 #ifdef INET6
 986 static void
 987 ipsec6_get_ulp(m, spidx, needport)
 988         struct mbuf *m;
 989         struct secpolicyindex *spidx;
 990         int needport;
 991 {
 992         int off, nxt;
 993         struct tcphdr th;
 994         struct udphdr uh;
 995
 996         /* sanity check */
 997         if (m == NULL)
 998                 panic("ipsec6_get_ulp: NULL pointer was passed.");
 999
1000         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1001                 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m));
1002
1003         /* set default */
1004         spidx->ul_proto = IPSEC_ULPROTO_ANY;
1005         ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
1006         ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
1007
1008         nxt = -1;
1009         off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
1010         if (off < 0 || m->m_pkthdr.len < off)
1011                 return;
1012
1013         switch (nxt) {
1014         case IPPROTO_TCP:
1015                 spidx->ul_proto = nxt;
1016                 if (!needport)
1017                         break;
1018                 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
1019                         break;
1020                 m_copydata(m, off, sizeof(th), (caddr_t)&th);
1021                 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
1022                 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
1023                 break;
1024         case IPPROTO_UDP:
1025                 spidx->ul_proto = nxt;
1026                 if (!needport)
1027                         break;
1028                 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
1029                         break;
1030                 m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
1031                 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
1032                 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
1033                 break;
1034         case IPPROTO_ICMPV6:
1035         default:
1036                 /* XXX intermediate headers??? */
1037                 spidx->ul_proto = nxt;
1038                 break;
1039         }
1040 }
1041
1042 /* assumes that m is sane */
1043 static int
1044 ipsec6_setspidx_ipaddr(m, spidx)
1045         struct mbuf *m;
1046         struct secpolicyindex *spidx;
1047 {
1048         struct ip6_hdr *ip6 = NULL;
1049         struct ip6_hdr ip6buf;
1050         struct sockaddr_in6 *sin6;
1051
1052         if (m->m_len >= sizeof(*ip6))
1053                 ip6 = mtod(m, struct ip6_hdr *);
1054         else {
1055                 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
1056                 ip6 = &ip6buf;
1057         }
1058
1059         sin6 = (struct sockaddr_in6 *)&spidx->src;
1060         bzero(sin6, sizeof(*sin6));
1061         sin6->sin6_family = AF_INET6;
1062         sin6->sin6_len = sizeof(struct sockaddr_in6);
1063         bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
1064         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
1065                 sin6->sin6_addr.s6_addr16[1] = 0;
1066                 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
1067         }
1068         spidx->prefs = sizeof(struct in6_addr) << 3;
1069
1070         sin6 = (struct sockaddr_in6 *)&spidx->dst;
1071         bzero(sin6, sizeof(*sin6));
1072         sin6->sin6_family = AF_INET6;
1073         sin6->sin6_len = sizeof(struct sockaddr_in6);
1074         bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
1075         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
1076                 sin6->sin6_addr.s6_addr16[1] = 0;
1077                 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
1078         }
1079         spidx->prefd = sizeof(struct in6_addr) << 3;
1080
1081         return 0;
1082 }
1083 #endif
1084
1085 static struct inpcbpolicy *
1086 ipsec_newpcbpolicy()
1087 {
1088         struct inpcbpolicy *p;
1089
1090         p = (struct inpcbpolicy *)malloc(sizeof(*p), M_SECA, M_NOWAIT);
1091         return p;
1092 }
1093
1094 static void
1095 ipsec_delpcbpolicy(p)
1096         struct inpcbpolicy *p;
1097 {
1098         free(p, M_SECA);
1099 }
1100
1101 /* initialize policy in PCB */
1102 int
1103 ipsec_init_policy(so, pcb_sp)
1104         struct socket *so;
1105         struct inpcbpolicy **pcb_sp;
1106 {
1107         struct inpcbpolicy *new;
1108
1109         /* sanity check. */
1110         if (so == NULL || pcb_sp == NULL)
1111                 panic("ipsec_init_policy: NULL pointer was passed.");
1112
1113         new = ipsec_newpcbpolicy();
1114         if (new == NULL) {
1115                 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n"));
1116                 return ENOBUFS;
1117         }
1118         bzero(new, sizeof(*new));
1119
1120         if (so->so_cred != 0 && so->so_cred->cr_uid == 0)
1121                 new->priv = 1;
1122         else
1123                 new->priv = 0;
1124
1125         if ((new->sp_in = key_newsp()) == NULL) {
1126                 ipsec_delpcbpolicy(new);
1127                 return ENOBUFS;
1128         }
1129         new->sp_in->state = IPSEC_SPSTATE_ALIVE;
1130         new->sp_in->policy = IPSEC_POLICY_ENTRUST;
1131
1132         if ((new->sp_out = key_newsp()) == NULL) {
1133                 key_freesp(new->sp_in);
1134                 ipsec_delpcbpolicy(new);
1135                 return ENOBUFS;
1136         }
1137         new->sp_out->state = IPSEC_SPSTATE_ALIVE;
1138         new->sp_out->policy = IPSEC_POLICY_ENTRUST;
1139
1140         *pcb_sp = new;
1141
1142         return 0;
1143 }
1144
1145 /* copy old ipsec policy into new */
1146 int
1147 ipsec_copy_policy(old, new)
1148         struct inpcbpolicy *old, *new;
1149 {
1150         struct secpolicy *sp;
1151
1152         sp = ipsec_deepcopy_policy(old->sp_in);
1153         if (sp) {
1154                 key_freesp(new->sp_in);
1155                 new->sp_in = sp;
1156         } else
1157                 return ENOBUFS;
1158
1159         sp = ipsec_deepcopy_policy(old->sp_out);
1160         if (sp) {
1161                 key_freesp(new->sp_out);
1162                 new->sp_out = sp;
1163         } else
1164                 return ENOBUFS;
1165
1166         new->priv = old->priv;
1167
1168         return 0;
1169 }
1170
1171 /* deep-copy a policy in PCB */
1172 static struct secpolicy *
1173 ipsec_deepcopy_policy(src)
1174         struct secpolicy *src;
1175 {
1176         struct ipsecrequest *newchain = NULL;
1177         struct ipsecrequest *p;
1178         struct ipsecrequest **q;
1179         struct ipsecrequest *r;
1180         struct secpolicy *dst;
1181
1182         dst = key_newsp();
1183         if (src == NULL || dst == NULL)
1184                 return NULL;
1185
1186         /*
1187          * deep-copy IPsec request chain.  This is required since struct
1188          * ipsecrequest is not reference counted.
1189          */
1190         q = &newchain;
1191         for (p = src->req; p; p = p->next) {
1192                 *q = (struct ipsecrequest *)malloc(sizeof(struct ipsecrequest),
1193                         M_SECA, M_NOWAIT);
1194                 if (*q == NULL)
1195                         goto fail;
1196                 bzero(*q, sizeof(**q));
1197                 (*q)->next = NULL;
1198
1199                 (*q)->saidx.proto = p->saidx.proto;
1200                 (*q)->saidx.mode = p->saidx.mode;
1201                 (*q)->level = p->level;
1202                 (*q)->saidx.reqid = p->saidx.reqid;
1203
1204                 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
1205                 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
1206
1207                 (*q)->sav = NULL;
1208                 (*q)->sp = dst;
1209
1210                 q = &((*q)->next);
1211         }
1212
1213         dst->req = newchain;
1214         dst->state = src->state;
1215         dst->policy = src->policy;
1216         /* do not touch the refcnt fields */
1217
1218         return dst;
1219
1220 fail:
1221         for (p = newchain; p; p = r) {
1222                 r = p->next;
1223                 free(p, M_SECA);
1224                 p = NULL;
1225         }
1226         return NULL;
1227 }
1228
1229 /* set policy and ipsec request if present. */
1230 static int
1231 ipsec_set_policy(pcb_sp, optname, request, len, priv)
1232         struct secpolicy **pcb_sp;
1233         int optname;
1234         caddr_t request;
1235         size_t len;
1236         int priv;
1237 {
1238         struct sadb_x_policy *xpl;
1239         struct secpolicy *newsp = NULL;
1240         int error;
1241
1242         /* sanity check. */
1243         if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
1244                 return EINVAL;
1245         if (len < sizeof(*xpl))
1246                 return EINVAL;
1247         xpl = (struct sadb_x_policy *)request;
1248
1249         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1250                 printf("ipsec_set_policy: passed policy\n");
1251                 kdebug_sadb_x_policy((struct sadb_ext *)xpl));
1252
1253         /* check policy type */
1254         /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
1255         if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
1256          || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
1257                 return EINVAL;
1258
1259         /* check privileged socket */
1260         if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS)
1261                 return EACCES;
1262
1263         /* allocation new SP entry */
1264         if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
1265                 return error;
1266
1267         newsp->state = IPSEC_SPSTATE_ALIVE;
1268
1269         /* clear old SP and set new SP */
1270         key_freesp(*pcb_sp);
1271         *pcb_sp = newsp;
1272         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1273                 printf("ipsec_set_policy: new policy\n");
1274                 kdebug_secpolicy(newsp));
1275
1276         return 0;
1277 }
1278
1279 static int
1280 ipsec_get_policy(pcb_sp, mp)
1281         struct secpolicy *pcb_sp;
1282         struct mbuf **mp;
1283 {
1284
1285         /* sanity check. */
1286         if (pcb_sp == NULL || mp == NULL)
1287                 return EINVAL;
1288
1289         *mp = key_sp2msg(pcb_sp);
1290         if (!*mp) {
1291                 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n"));
1292                 return ENOBUFS;
1293         }
1294
1295         (*mp)->m_type = MT_DATA;
1296         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1297                 printf("ipsec_get_policy:\n");
1298                 kdebug_mbuf(*mp));
1299
1300         return 0;
1301 }
1302
1303 int
1304 ipsec4_set_policy(inp, optname, request, len, priv)
1305         struct inpcb *inp;
1306         int optname;
1307         caddr_t request;
1308         size_t len;
1309         int priv;
1310 {
1311         struct sadb_x_policy *xpl;
1312         struct secpolicy **pcb_sp;
1313
1314         /* sanity check. */
1315         if (inp == NULL || request == NULL)
1316                 return EINVAL;
1317         if (len < sizeof(*xpl))
1318                 return EINVAL;
1319         xpl = (struct sadb_x_policy *)request;
1320
1321         /* select direction */
1322         switch (xpl->sadb_x_policy_dir) {
1323         case IPSEC_DIR_INBOUND:
1324                 pcb_sp = &inp->inp_sp->sp_in;
1325                 break;
1326         case IPSEC_DIR_OUTBOUND:
1327                 pcb_sp = &inp->inp_sp->sp_out;
1328                 break;
1329         default:
1330                 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
1331                         xpl->sadb_x_policy_dir));
1332                 return EINVAL;
1333         }
1334
1335         return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1336 }
1337
1338 int
1339 ipsec4_get_policy(inp, request, len, mp)
1340         struct inpcb *inp;
1341         caddr_t request;
1342         size_t len;
1343         struct mbuf **mp;
1344 {
1345         struct sadb_x_policy *xpl;
1346         struct secpolicy *pcb_sp;
1347
1348         /* sanity check. */
1349         if (inp == NULL || request == NULL || mp == NULL)
1350                 return EINVAL;
1351         if (inp->inp_sp == NULL)
1352                 panic("policy in PCB is NULL");
1353         if (len < sizeof(*xpl))
1354                 return EINVAL;
1355         xpl = (struct sadb_x_policy *)request;
1356
1357         /* select direction */
1358         switch (xpl->sadb_x_policy_dir) {
1359         case IPSEC_DIR_INBOUND:
1360                 pcb_sp = inp->inp_sp->sp_in;
1361                 break;
1362         case IPSEC_DIR_OUTBOUND:
1363                 pcb_sp = inp->inp_sp->sp_out;
1364                 break;
1365         default:
1366                 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
1367                         xpl->sadb_x_policy_dir));
1368                 return EINVAL;
1369         }
1370
1371         return ipsec_get_policy(pcb_sp, mp);
1372 }
1373
1374 /* delete policy in PCB */
1375 int
1376 ipsec4_delete_pcbpolicy(inp)
1377         struct inpcb *inp;
1378 {
1379         /* sanity check. */
1380         if (inp == NULL)
1381                 panic("ipsec4_delete_pcbpolicy: NULL pointer was passed.");
1382
1383         if (inp->inp_sp == NULL)
1384                 return 0;
1385
1386         if (inp->inp_sp->sp_in != NULL) {
1387                 key_freesp(inp->inp_sp->sp_in);
1388                 inp->inp_sp->sp_in = NULL;
1389         }
1390
1391         if (inp->inp_sp->sp_out != NULL) {
1392                 key_freesp(inp->inp_sp->sp_out);
1393                 inp->inp_sp->sp_out = NULL;
1394         }
1395
1396         ipsec_delpcbpolicy(inp->inp_sp);
1397         inp->inp_sp = NULL;
1398
1399         return 0;
1400 }
1401
1402 #ifdef INET6
1403 int
1404 ipsec6_set_policy(in6p, optname, request, len, priv)
1405         struct in6pcb *in6p;
1406         int optname;
1407         caddr_t request;
1408         size_t len;
1409         int priv;
1410 {
1411         struct sadb_x_policy *xpl;
1412         struct secpolicy **pcb_sp;
1413
1414         /* sanity check. */
1415         if (in6p == NULL || request == NULL)
1416                 return EINVAL;
1417         if (len < sizeof(*xpl))
1418                 return EINVAL;
1419         xpl = (struct sadb_x_policy *)request;
1420
1421         /* select direction */
1422         switch (xpl->sadb_x_policy_dir) {
1423         case IPSEC_DIR_INBOUND:
1424                 pcb_sp = &in6p->in6p_sp->sp_in;
1425                 break;
1426         case IPSEC_DIR_OUTBOUND:
1427                 pcb_sp = &in6p->in6p_sp->sp_out;
1428                 break;
1429         default:
1430                 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
1431                         xpl->sadb_x_policy_dir));
1432                 return EINVAL;
1433         }
1434
1435         return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1436 }
1437
1438 int
1439 ipsec6_get_policy(in6p, request, len, mp)
1440         struct in6pcb *in6p;
1441         caddr_t request;
1442         size_t len;
1443         struct mbuf **mp;
1444 {
1445         struct sadb_x_policy *xpl;
1446         struct secpolicy *pcb_sp;
1447
1448         /* sanity check. */
1449         if (in6p == NULL || request == NULL || mp == NULL)
1450                 return EINVAL;
1451         if (in6p->in6p_sp == NULL)
1452                 panic("policy in PCB is NULL");
1453         if (len < sizeof(*xpl))
1454                 return EINVAL;
1455         xpl = (struct sadb_x_policy *)request;
1456
1457         /* select direction */
1458         switch (xpl->sadb_x_policy_dir) {
1459         case IPSEC_DIR_INBOUND:
1460                 pcb_sp = in6p->in6p_sp->sp_in;
1461                 break;
1462         case IPSEC_DIR_OUTBOUND:
1463                 pcb_sp = in6p->in6p_sp->sp_out;
1464                 break;
1465         default:
1466                 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
1467                         xpl->sadb_x_policy_dir));
1468                 return EINVAL;
1469         }
1470
1471         return ipsec_get_policy(pcb_sp, mp);
1472 }
1473
1474 int
1475 ipsec6_delete_pcbpolicy(in6p)
1476         struct in6pcb *in6p;
1477 {
1478         /* sanity check. */
1479         if (in6p == NULL)
1480                 panic("ipsec6_delete_pcbpolicy: NULL pointer was passed.");
1481
1482         if (in6p->in6p_sp == NULL)
1483                 return 0;
1484
1485         if (in6p->in6p_sp->sp_in != NULL) {
1486                 key_freesp(in6p->in6p_sp->sp_in);
1487                 in6p->in6p_sp->sp_in = NULL;
1488         }
1489
1490         if (in6p->in6p_sp->sp_out != NULL) {
1491                 key_freesp(in6p->in6p_sp->sp_out);
1492                 in6p->in6p_sp->sp_out = NULL;
1493         }
1494
1495         ipsec_delpcbpolicy(in6p->in6p_sp);
1496         in6p->in6p_sp = NULL;
1497
1498         return 0;
1499 }
1500 #endif
1501
1502 /*
1503  * return current level.
1504  * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
1505  */
1506 u_int
1507 ipsec_get_reqlevel(isr)
1508         struct ipsecrequest *isr;
1509 {
1510         u_int level = 0;
1511         u_int esp_trans_deflev, esp_net_deflev, ah_trans_deflev, ah_net_deflev;
1512
1513         /* sanity check */
1514         if (isr == NULL || isr->sp == NULL)
1515                 panic("ipsec_get_reqlevel: NULL pointer is passed.");
1516         if (((struct sockaddr *)&isr->sp->spidx.src)->sa_family
1517                         != ((struct sockaddr *)&isr->sp->spidx.dst)->sa_family)
1518                 panic("ipsec_get_reqlevel: family mismatched.");
1519
1520 /* XXX note that we have ipseclog() expanded here - code sync issue */
1521 #define IPSEC_CHECK_DEFAULT(lev) \
1522         (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE            \
1523                         && (lev) != IPSEC_LEVEL_UNIQUE)                       \
1524                 ? (ipsec_debug                                                \
1525                         ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
1526                                 (lev), IPSEC_LEVEL_REQUIRE)                   \
1527                         : 0),                                                 \
1528                         (lev) = IPSEC_LEVEL_REQUIRE,                          \
1529                         (lev)                                                 \
1530                 : (lev))
1531
1532         /* set default level */
1533         switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
1534 #ifdef INET
1535         case AF_INET:
1536                 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
1537                 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
1538                 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
1539                 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
1540                 break;
1541 #endif
1542 #ifdef INET6
1543         case AF_INET6:
1544                 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
1545                 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
1546                 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
1547                 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
1548                 break;
1549 #endif /* INET6 */
1550         default:
1551                 panic("key_get_reqlevel: Unknown family. %d",
1552                         ((struct sockaddr *)&isr->sp->spidx.src)->sa_family);
1553         }
1554
1555 #undef IPSEC_CHECK_DEFAULT
1556
1557         /* set level */
1558         switch (isr->level) {
1559         case IPSEC_LEVEL_DEFAULT:
1560                 switch (isr->saidx.proto) {
1561                 case IPPROTO_ESP:
1562                         if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1563                                 level = esp_net_deflev;
1564                         else
1565                                 level = esp_trans_deflev;
1566                         break;
1567                 case IPPROTO_AH:
1568                         if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1569                                 level = ah_net_deflev;
1570                         else
1571                                 level = ah_trans_deflev;
1572                 case IPPROTO_IPCOMP:
1573                         /*
1574                          * we don't really care, as IPcomp document says that
1575                          * we shouldn't compress small packets
1576                          */
1577                         level = IPSEC_LEVEL_USE;
1578                         break;
1579                 default:
1580                         panic("ipsec_get_reqlevel: "
1581                                 "Illegal protocol defined %u",
1582                                 isr->saidx.proto);
1583                 }
1584                 break;
1585
1586         case IPSEC_LEVEL_USE:
1587         case IPSEC_LEVEL_REQUIRE:
1588                 level = isr->level;
1589                 break;
1590         case IPSEC_LEVEL_UNIQUE:
1591                 level = IPSEC_LEVEL_REQUIRE;
1592                 break;
1593
1594         default:
1595                 panic("ipsec_get_reqlevel: Illegal IPsec level %u",
1596                         isr->level);
1597         }
1598
1599         return level;
1600 }
1601
1602 /*
1603  * Check AH/ESP integrity.
1604  * OUT:
1605  *      0: valid
1606  *      1: invalid
1607  */
1608 static int
1609 ipsec_in_reject(sp, m)
1610         struct secpolicy *sp;
1611         struct mbuf *m;
1612 {
1613         struct ipsecrequest *isr;
1614         u_int level;
1615         int need_auth, need_conf, need_icv;
1616
1617         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1618                 printf("ipsec_in_reject: using SP\n");
1619                 kdebug_secpolicy(sp));
1620
1621         /* check policy */
1622         switch (sp->policy) {
1623         case IPSEC_POLICY_DISCARD:
1624                 return 1;
1625         case IPSEC_POLICY_BYPASS:
1626         case IPSEC_POLICY_NONE:
1627                 return 0;
1628
1629         case IPSEC_POLICY_IPSEC:
1630                 break;
1631
1632         case IPSEC_POLICY_ENTRUST:
1633         default:
1634                 panic("ipsec_hdrsiz: Invalid policy found. %d", sp->policy);
1635         }
1636
1637         need_auth = 0;
1638         need_conf = 0;
1639         need_icv = 0;
1640
1641         /* XXX should compare policy against ipsec header history */
1642
1643         for (isr = sp->req; isr != NULL; isr = isr->next) {
1644
1645                 /* get current level */
1646                 level = ipsec_get_reqlevel(isr);
1647
1648                 switch (isr->saidx.proto) {
1649                 case IPPROTO_ESP:
1650                         if (level == IPSEC_LEVEL_REQUIRE) {
1651                                 need_conf++;
1652
1653                                 if (isr->sav != NULL
1654                                  && isr->sav->flags == SADB_X_EXT_NONE
1655                                  && isr->sav->alg_auth != SADB_AALG_NONE)
1656                                         need_icv++;
1657                         }
1658                         break;
1659                 case IPPROTO_AH:
1660                         if (level == IPSEC_LEVEL_REQUIRE) {
1661                                 need_auth++;
1662                                 need_icv++;
1663                         }
1664                         break;
1665                 case IPPROTO_IPCOMP:
1666                         /*
1667                          * we don't really care, as IPcomp document says that
1668                          * we shouldn't compress small packets, IPComp policy
1669                          * should always be treated as being in "use" level.
1670                          */
1671                         break;
1672                 }
1673         }
1674
1675         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1676                 printf("ipsec_in_reject: auth:%d conf:%d icv:%d m_flags:%x\n",
1677                         need_auth, need_conf, need_icv, m->m_flags));
1678
1679         if ((need_conf && !(m->m_flags & M_DECRYPTED))
1680          || (!need_auth && need_icv && !(m->m_flags & M_AUTHIPDGM))
1681          || (need_auth && !(m->m_flags & M_AUTHIPHDR)))
1682                 return 1;
1683
1684         return 0;
1685 }
1686
1687 /*
1688  * Check AH/ESP integrity.
1689  * This function is called from tcp_input(), udp_input(),
1690  * and {ah,esp}4_input for tunnel mode
1691  */
1692 int
1693 ipsec4_in_reject_so(m, so)
1694         struct mbuf *m;
1695         struct socket *so;
1696 {
1697         struct secpolicy *sp = NULL;
1698         int error;
1699         int result;
1700
1701         /* sanity check */
1702         if (m == NULL)
1703                 return 0;       /* XXX should be panic ? */
1704
1705         /* get SP for this packet.
1706          * When we are called from ip_forward(), we call
1707          * ipsec4_getpolicybyaddr() with IP_FORWARDING flag.
1708          */
1709         if (so == NULL)
1710                 sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1711         else
1712                 sp = ipsec4_getpolicybysock(m, IPSEC_DIR_INBOUND, so, &error);
1713
1714         if (sp == NULL)
1715                 return 0;       /* XXX should be panic ?
1716                                  * -> No, there may be error. */
1717
1718         result = ipsec_in_reject(sp, m);
1719         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1720                 printf("DP ipsec4_in_reject_so call free SP:%p\n", sp));
1721         key_freesp(sp);
1722
1723         return result;
1724 }
1725
1726 int
1727 ipsec4_in_reject(m, inp)
1728         struct mbuf *m;
1729         struct inpcb *inp;
1730 {
1731         if (inp == NULL)
1732                 return ipsec4_in_reject_so(m, NULL);
1733         if (inp->inp_socket)
1734                 return ipsec4_in_reject_so(m, inp->inp_socket);
1735         else
1736                 panic("ipsec4_in_reject: invalid inpcb/socket");
1737 }
1738
1739 #ifdef INET6
1740 /*
1741  * Check AH/ESP integrity.
1742  * This function is called from tcp6_input(), udp6_input(),
1743  * and {ah,esp}6_input for tunnel mode
1744  */
1745 int
1746 ipsec6_in_reject_so(m, so)
1747         struct mbuf *m;
1748         struct socket *so;
1749 {
1750         struct secpolicy *sp = NULL;
1751         int error;
1752         int result;
1753
1754         /* sanity check */
1755         if (m == NULL)
1756                 return 0;       /* XXX should be panic ? */
1757
1758         /* get SP for this packet.
1759          * When we are called from ip_forward(), we call
1760          * ipsec6_getpolicybyaddr() with IP_FORWARDING flag.
1761          */
1762         if (so == NULL)
1763                 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1764         else
1765                 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_INBOUND, so, &error);
1766
1767         if (sp == NULL)
1768                 return 0;       /* XXX should be panic ? */
1769
1770         result = ipsec_in_reject(sp, m);
1771         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1772                 printf("DP ipsec6_in_reject_so call free SP:%p\n", sp));
1773         key_freesp(sp);
1774
1775         return result;
1776 }
1777
1778 int
1779 ipsec6_in_reject(m, in6p)
1780         struct mbuf *m;
1781         struct in6pcb *in6p;
1782 {
1783         if (in6p == NULL)
1784                 return ipsec6_in_reject_so(m, NULL);
1785         if (in6p->in6p_socket)
1786                 return ipsec6_in_reject_so(m, in6p->in6p_socket);
1787         else
1788                 panic("ipsec6_in_reject: invalid in6p/socket");
1789 }
1790 #endif
1791
1792 /*
1793  * compute the byte size to be occupied by IPsec header.
1794  * in case it is tunneled, it includes the size of outer IP header.
1795  * NOTE: SP passed is free in this function.
1796  */
1797 static size_t
1798 ipsec_hdrsiz(sp)
1799         struct secpolicy *sp;
1800 {
1801         struct ipsecrequest *isr;
1802         size_t siz, clen;
1803
1804         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1805                 printf("ipsec_hdrsiz: using SP\n");
1806                 kdebug_secpolicy(sp));
1807
1808         /* check policy */
1809         switch (sp->policy) {
1810         case IPSEC_POLICY_DISCARD:
1811         case IPSEC_POLICY_BYPASS:
1812         case IPSEC_POLICY_NONE:
1813                 return 0;
1814
1815         case IPSEC_POLICY_IPSEC:
1816                 break;
1817
1818         case IPSEC_POLICY_ENTRUST:
1819         default:
1820                 panic("ipsec_hdrsiz: Invalid policy found. %d", sp->policy);
1821         }
1822
1823         siz = 0;
1824
1825         for (isr = sp->req; isr != NULL; isr = isr->next) {
1826
1827                 clen = 0;
1828
1829                 switch (isr->saidx.proto) {
1830                 case IPPROTO_ESP:
1831 #ifdef IPSEC_ESP
1832                         clen = esp_hdrsiz(isr);
1833 #else
1834                         clen = 0;       /* XXX */
1835 #endif
1836                         break;
1837                 case IPPROTO_AH:
1838                         clen = ah_hdrsiz(isr);
1839                         break;
1840                 case IPPROTO_IPCOMP:
1841                         clen = sizeof(struct ipcomp);
1842                         break;
1843                 }
1844
1845                 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
1846                         switch (((struct sockaddr *)&isr->saidx.dst)->sa_family) {
1847                         case AF_INET:
1848                                 clen += sizeof(struct ip);
1849                                 break;
1850 #ifdef INET6
1851                         case AF_INET6:
1852                                 clen += sizeof(struct ip6_hdr);
1853                                 break;
1854 #endif
1855                         default:
1856                                 ipseclog((LOG_ERR, "ipsec_hdrsiz: "
1857                                     "unknown AF %d in IPsec tunnel SA\n",
1858                                     ((struct sockaddr *)&isr->saidx.dst)->sa_family));
1859                                 break;
1860                         }
1861                 }
1862                 siz += clen;
1863         }
1864
1865         return siz;
1866 }
1867
1868 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
1869 size_t
1870 ipsec4_hdrsiz(m, dir, inp)
1871         struct mbuf *m;
1872         u_int dir;
1873         struct inpcb *inp;
1874 {
1875         struct secpolicy *sp = NULL;
1876         int error;
1877         size_t size;
1878
1879         /* sanity check */
1880         if (m == NULL)
1881                 return 0;       /* XXX should be panic ? */
1882         if (inp != NULL && inp->inp_socket == NULL)
1883                 panic("ipsec4_hdrsize: why is socket NULL but there is PCB.");
1884
1885         /* get SP for this packet.
1886          * When we are called from ip_forward(), we call
1887          * ipsec4_getpolicybyaddr() with IP_FORWARDING flag.
1888          */
1889         if (inp == NULL)
1890                 sp = ipsec4_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1891         else
1892                 sp = ipsec4_getpolicybysock(m, dir, inp->inp_socket, &error);
1893
1894         if (sp == NULL)
1895                 return 0;       /* XXX should be panic ? */
1896
1897         size = ipsec_hdrsiz(sp);
1898         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1899                 printf("DP ipsec4_hdrsiz call free SP:%p\n", sp));
1900         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1901                 printf("ipsec4_hdrsiz: size:%lu.\n", (unsigned long)size));
1902         key_freesp(sp);
1903
1904         return size;
1905 }
1906
1907 #ifdef INET6
1908 /* This function is called from ipsec6_hdrsize_tcp(),
1909  * and maybe from ip6_forward.()
1910  */
1911 size_t
1912 ipsec6_hdrsiz(m, dir, in6p)
1913         struct mbuf *m;
1914         u_int dir;
1915         struct in6pcb *in6p;
1916 {
1917         struct secpolicy *sp = NULL;
1918         int error;
1919         size_t size;
1920
1921         /* sanity check */
1922         if (m == NULL)
1923                 return 0;       /* XXX shoud be panic ? */
1924         if (in6p != NULL && in6p->in6p_socket == NULL)
1925                 panic("ipsec6_hdrsize: why is socket NULL but there is PCB.");
1926
1927         /* get SP for this packet */
1928         /* XXX Is it right to call with IP_FORWARDING. */
1929         if (in6p == NULL)
1930                 sp = ipsec6_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1931         else
1932                 sp = ipsec6_getpolicybysock(m, dir, in6p->in6p_socket, &error);
1933
1934         if (sp == NULL)
1935                 return 0;
1936         size = ipsec_hdrsiz(sp);
1937         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1938                 printf("DP ipsec6_hdrsiz call free SP:%p\n", sp));
1939         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1940                 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size));
1941         key_freesp(sp);
1942
1943         return size;
1944 }
1945 #endif /* INET6 */
1946
1947 #ifdef INET
1948 /*
1949  * encapsulate for ipsec tunnel.
1950  * ip->ip_src must be fixed later on.
1951  */
1952 static int
1953 ipsec4_encapsulate(m, sav)
1954         struct mbuf *m;
1955         struct secasvar *sav;
1956 {
1957         struct ip *oip;
1958         struct ip *ip;
1959         size_t hlen;
1960         size_t plen;
1961
1962         /* can't tunnel between different AFs */
1963         if (((struct sockaddr *)&sav->sah->saidx.src)->sa_family
1964                 != ((struct sockaddr *)&sav->sah->saidx.dst)->sa_family
1965          || ((struct sockaddr *)&sav->sah->saidx.src)->sa_family != AF_INET) {
1966                 m_freem(m);
1967                 return EINVAL;
1968         }
1969 #if 0
1970         /* XXX if the dst is myself, perform nothing. */
1971         if (key_ismyaddr((struct sockaddr *)&sav->sah->saidx.dst)) {
1972                 m_freem(m);
1973                 return EINVAL;
1974         }
1975 #endif
1976
1977         if (m->m_len < sizeof(*ip))
1978                 panic("ipsec4_encapsulate: assumption failed (first mbuf length)");
1979
1980         ip = mtod(m, struct ip *);
1981 #ifdef _IP_VHL
1982         hlen = _IP_VHL_HL(ip->ip_vhl) << 2;
1983 #else
1984         hlen = ip->ip_hl << 2;
1985 #endif
1986
1987         if (m->m_len != hlen)
1988                 panic("ipsec4_encapsulate: assumption failed (first mbuf length)");
1989
1990         /* generate header checksum */
1991         ip->ip_sum = 0;
1992 #ifdef _IP_VHL
1993         if (ip->ip_vhl == IP_VHL_BORING)
1994                 ip->ip_sum = in_cksum_hdr(ip);
1995         else
1996                 ip->ip_sum = in_cksum(m, hlen);
1997 #else
1998         ip->ip_sum = in_cksum(m, hlen);
1999 #endif
2000
2001         plen = m->m_pkthdr.len;
2002
2003         /*
2004          * grow the mbuf to accomodate the new IPv4 header.
2005          * NOTE: IPv4 options will never be copied.
2006          */
2007         if (M_LEADINGSPACE(m->m_next) < hlen) {
2008                 struct mbuf *n;
2009                 MGET(n, M_DONTWAIT, MT_DATA);
2010                 if (!n) {
2011                         m_freem(m);
2012                         return ENOBUFS;
2013                 }
2014                 n->m_len = hlen;
2015                 n->m_next = m->m_next;
2016                 m->m_next = n;
2017                 m->m_pkthdr.len += hlen;
2018                 oip = mtod(n, struct ip *);
2019         } else {
2020                 m->m_next->m_len += hlen;
2021                 m->m_next->m_data -= hlen;
2022                 m->m_pkthdr.len += hlen;
2023                 oip = mtod(m->m_next, struct ip *);
2024         }
2025         ip = mtod(m, struct ip *);
2026         ovbcopy((caddr_t)ip, (caddr_t)oip, hlen);
2027         m->m_len = sizeof(struct ip);
2028         m->m_pkthdr.len -= (hlen - sizeof(struct ip));
2029
2030         /* construct new IPv4 header. see RFC 2401 5.1.2.1 */
2031         /* ECN consideration. */
2032         ip_ecn_ingress(ip4_ipsec_ecn, &ip->ip_tos, &oip->ip_tos);
2033 #ifdef _IP_VHL
2034         ip->ip_vhl = IP_MAKE_VHL(IPVERSION, sizeof(struct ip) >> 2);
2035 #else
2036         ip->ip_hl = sizeof(struct ip) >> 2;
2037 #endif
2038         ip->ip_off &= htons(~IP_OFFMASK);
2039         ip->ip_off &= htons(~IP_MF);
2040         switch (ip4_ipsec_dfbit) {
2041         case 0: /* clear DF bit */
2042                 ip->ip_off &= htons(~IP_DF);
2043                 break;
2044         case 1: /* set DF bit */
2045                 ip->ip_off |= htons(IP_DF);
2046                 break;
2047         default:        /* copy DF bit */
2048                 break;
2049         }
2050         ip->ip_p = IPPROTO_IPIP;
2051         if (plen + sizeof(struct ip) < IP_MAXPACKET)
2052                 ip->ip_len = htons(plen + sizeof(struct ip));
2053         else {
2054                 ipseclog((LOG_ERR, "IPv4 ipsec: size exceeds limit: "
2055                         "leave ip_len as is (invalid packet)\n"));
2056         }
2057 #ifdef RANDOM_IP_ID
2058         ip->ip_id = ip_randomid();
2059 #else
2060         ip->ip_id = htons(ip_id++);
2061 #endif
2062         bcopy(&((struct sockaddr_in *)&sav->sah->saidx.src)->sin_addr,
2063                 &ip->ip_src, sizeof(ip->ip_src));
2064         bcopy(&((struct sockaddr_in *)&sav->sah->saidx.dst)->sin_addr,
2065                 &ip->ip_dst, sizeof(ip->ip_dst));
2066         ip->ip_ttl = IPDEFTTL;
2067
2068         /* XXX Should ip_src be updated later ? */
2069
2070         return 0;
2071 }
2072 #endif /* INET */
2073
2074 #ifdef INET6
2075 static int
2076 ipsec6_encapsulate(m, sav)
2077         struct mbuf *m;
2078         struct secasvar *sav;
2079 {
2080         struct ip6_hdr *oip6;
2081         struct ip6_hdr *ip6;
2082         size_t plen;
2083
2084         /* can't tunnel between different AFs */
2085         if (((struct sockaddr *)&sav->sah->saidx.src)->sa_family
2086                 != ((struct sockaddr *)&sav->sah->saidx.dst)->sa_family
2087          || ((struct sockaddr *)&sav->sah->saidx.src)->sa_family != AF_INET6) {
2088                 m_freem(m);
2089                 return EINVAL;
2090         }
2091 #if 0
2092         /* XXX if the dst is myself, perform nothing. */
2093         if (key_ismyaddr((struct sockaddr *)&sav->sah->saidx.dst)) {
2094                 m_freem(m);
2095                 return EINVAL;
2096         }
2097 #endif
2098
2099         plen = m->m_pkthdr.len;
2100
2101         /*
2102          * grow the mbuf to accomodate the new IPv6 header.
2103          */
2104         if (m->m_len != sizeof(struct ip6_hdr))
2105                 panic("ipsec6_encapsulate: assumption failed (first mbuf length)");
2106         if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) {
2107                 struct mbuf *n;
2108                 MGET(n, M_DONTWAIT, MT_DATA);
2109                 if (!n) {
2110                         m_freem(m);
2111                         return ENOBUFS;
2112                 }
2113                 n->m_len = sizeof(struct ip6_hdr);
2114                 n->m_next = m->m_next;
2115                 m->m_next = n;
2116                 m->m_pkthdr.len += sizeof(struct ip6_hdr);
2117                 oip6 = mtod(n, struct ip6_hdr *);
2118         } else {
2119                 m->m_next->m_len += sizeof(struct ip6_hdr);
2120                 m->m_next->m_data -= sizeof(struct ip6_hdr);
2121                 m->m_pkthdr.len += sizeof(struct ip6_hdr);
2122                 oip6 = mtod(m->m_next, struct ip6_hdr *);
2123         }
2124         ip6 = mtod(m, struct ip6_hdr *);
2125         ovbcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr));
2126
2127         /* Fake link-local scope-class addresses */
2128         if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
2129                 oip6->ip6_src.s6_addr16[1] = 0;
2130         if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
2131                 oip6->ip6_dst.s6_addr16[1] = 0;
2132
2133         /* construct new IPv6 header. see RFC 2401 5.1.2.2 */
2134         /* ECN consideration. */
2135         ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow);
2136         if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr))
2137                 ip6->ip6_plen = htons(plen);
2138         else {
2139                 /* ip6->ip6_plen will be updated in ip6_output() */
2140         }
2141         ip6->ip6_nxt = IPPROTO_IPV6;
2142         bcopy(&((struct sockaddr_in6 *)&sav->sah->saidx.src)->sin6_addr,
2143                 &ip6->ip6_src, sizeof(ip6->ip6_src));
2144         bcopy(&((struct sockaddr_in6 *)&sav->sah->saidx.dst)->sin6_addr,
2145                 &ip6->ip6_dst, sizeof(ip6->ip6_dst));
2146         ip6->ip6_hlim = IPV6_DEFHLIM;
2147
2148         /* XXX Should ip6_src be updated later ? */
2149
2150         return 0;
2151 }
2152 #endif /* INET6 */
2153
2154 /*
2155  * Check the variable replay window.
2156  * ipsec_chkreplay() performs replay check before ICV verification.
2157  * ipsec_updatereplay() updates replay bitmap.  This must be called after
2158  * ICV verification (it also performs replay check, which is usually done
2159  * beforehand).
2160  * 0 (zero) is returned if packet disallowed, 1 if packet permitted.
2161  *
2162  * based on RFC 2401.
2163  */
2164 int
2165 ipsec_chkreplay(seq, sav)
2166         u_int32_t seq;
2167         struct secasvar *sav;
2168 {
2169         const struct secreplay *replay;
2170         u_int32_t diff;
2171         int fr;
2172         u_int32_t wsizeb;       /* constant: bits of window size */
2173         int frlast;             /* constant: last frame */
2174
2175         /* sanity check */
2176         if (sav == NULL)
2177                 panic("ipsec_chkreplay: NULL pointer was passed.");
2178
2179         replay = sav->replay;
2180
2181         if (replay->wsize == 0)
2182                 return 1;       /* no need to check replay. */
2183
2184         /* constant */
2185         frlast = replay->wsize - 1;
2186         wsizeb = replay->wsize << 3;
2187
2188         /* sequence number of 0 is invalid */
2189         if (seq == 0)
2190                 return 0;
2191
2192         /* first time is always okay */
2193         if (replay->count == 0)
2194                 return 1;
2195
2196         if (seq > replay->lastseq) {
2197                 /* larger sequences are okay */
2198                 return 1;
2199         } else {
2200                 /* seq is equal or less than lastseq. */
2201                 diff = replay->lastseq - seq;
2202
2203                 /* over range to check, i.e. too old or wrapped */
2204                 if (diff >= wsizeb)
2205                         return 0;
2206
2207                 fr = frlast - diff / 8;
2208
2209                 /* this packet already seen ? */
2210                 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
2211                         return 0;
2212
2213                 /* out of order but good */
2214                 return 1;
2215         }
2216 }
2217
2218 /*
2219  * check replay counter whether to update or not.
2220  * OUT: 0:      OK
2221  *      1:      NG
2222  */
2223 int
2224 ipsec_updatereplay(seq, sav)
2225         u_int32_t seq;
2226         struct secasvar *sav;
2227 {
2228         struct secreplay *replay;
2229         u_int32_t diff;
2230         int fr;
2231         u_int32_t wsizeb;       /* constant: bits of window size */
2232         int frlast;             /* constant: last frame */
2233
2234         /* sanity check */
2235         if (sav == NULL)
2236                 panic("ipsec_chkreplay: NULL pointer was passed.");
2237
2238         replay = sav->replay;
2239
2240         if (replay->wsize == 0)
2241                 goto ok;        /* no need to check replay. */
2242
2243         /* constant */
2244         frlast = replay->wsize - 1;
2245         wsizeb = replay->wsize << 3;
2246
2247         /* sequence number of 0 is invalid */
2248         if (seq == 0)
2249                 return 1;
2250
2251         /* first time */
2252         if (replay->count == 0) {
2253                 replay->lastseq = seq;
2254                 bzero(replay->bitmap, replay->wsize);
2255                 (replay->bitmap)[frlast] = 1;
2256                 goto ok;
2257         }
2258
2259         if (seq > replay->lastseq) {
2260                 /* seq is larger than lastseq. */
2261                 diff = seq - replay->lastseq;
2262
2263                 /* new larger sequence number */
2264                 if (diff < wsizeb) {
2265                         /* In window */
2266                         /* set bit for this packet */
2267                         vshiftl(replay->bitmap, diff, replay->wsize);
2268                         (replay->bitmap)[frlast] |= 1;
2269                 } else {
2270                         /* this packet has a "way larger" */
2271                         bzero(replay->bitmap, replay->wsize);
2272                         (replay->bitmap)[frlast] = 1;
2273                 }
2274                 replay->lastseq = seq;
2275
2276                 /* larger is good */
2277         } else {
2278                 /* seq is equal or less than lastseq. */
2279                 diff = replay->lastseq - seq;
2280
2281                 /* over range to check, i.e. too old or wrapped */
2282                 if (diff >= wsizeb)
2283                         return 1;
2284
2285                 fr = frlast - diff / 8;
2286
2287                 /* this packet already seen ? */
2288                 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
2289                         return 1;
2290
2291                 /* mark as seen */
2292                 (replay->bitmap)[fr] |= (1 << (diff % 8));
2293
2294                 /* out of order but good */
2295         }
2296
2297 ok:
2298         if (replay->count == ~0) {
2299
2300                 /* set overflow flag */
2301                 replay->overflow++;
2302
2303                 /* don't increment, no more packets accepted */
2304                 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
2305                         return 1;
2306
2307                 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n",
2308                     replay->overflow, ipsec_logsastr(sav)));
2309         }
2310
2311         replay->count++;
2312
2313         return 0;
2314 }
2315
2316 /*
2317  * shift variable length buffer to left.
2318  * IN:  bitmap: pointer to the buffer
2319  *      nbit:   the number of to shift.
2320  *      wsize:  buffer size (bytes).
2321  */
2322 static void
2323 vshiftl(bitmap, nbit, wsize)
2324         unsigned char *bitmap;
2325         int nbit, wsize;
2326 {
2327         int s, j, i;
2328         unsigned char over;
2329
2330         for (j = 0; j < nbit; j += 8) {
2331                 s = (nbit - j < 8) ? (nbit - j): 8;
2332                 bitmap[0] <<= s;
2333                 for (i = 1; i < wsize; i++) {
2334                         over = (bitmap[i] >> (8 - s));
2335                         bitmap[i] <<= s;
2336                         bitmap[i-1] |= over;
2337                 }
2338         }
2339
2340         return;
2341 }
2342
2343 const char *
2344 ipsec4_logpacketstr(ip, spi)
2345         struct ip *ip;
2346         u_int32_t spi;
2347 {
2348         static char buf[256];
2349         char *p;
2350         u_int8_t *s, *d;
2351
2352         s = (u_int8_t *)(&ip->ip_src);
2353         d = (u_int8_t *)(&ip->ip_dst);
2354
2355         p = buf;
2356         snprintf(buf, sizeof(buf), "packet(SPI=%u ", (u_int32_t)ntohl(spi));
2357         while (p && *p)
2358                 p++;
2359         snprintf(p, sizeof(buf) - (p - buf), "src=%u.%u.%u.%u",
2360                 s[0], s[1], s[2], s[3]);
2361         while (p && *p)
2362                 p++;
2363         snprintf(p, sizeof(buf) - (p - buf), " dst=%u.%u.%u.%u",
2364                 d[0], d[1], d[2], d[3]);
2365         while (p && *p)
2366                 p++;
2367         snprintf(p, sizeof(buf) - (p - buf), ")");
2368
2369         return buf;
2370 }
2371
2372 #ifdef INET6
2373 const char *
2374 ipsec6_logpacketstr(ip6, spi)
2375         struct ip6_hdr *ip6;
2376         u_int32_t spi;
2377 {
2378         static char buf[256];
2379         char *p;
2380
2381         p = buf;
2382         snprintf(buf, sizeof(buf), "packet(SPI=%u ", (u_int32_t)ntohl(spi));
2383         while (p && *p)
2384                 p++;
2385         snprintf(p, sizeof(buf) - (p - buf), "src=%s",
2386                 ip6_sprintf(&ip6->ip6_src));
2387         while (p && *p)
2388                 p++;
2389         snprintf(p, sizeof(buf) - (p - buf), " dst=%s",
2390                 ip6_sprintf(&ip6->ip6_dst));
2391         while (p && *p)
2392                 p++;
2393         snprintf(p, sizeof(buf) - (p - buf), ")");
2394
2395         return buf;
2396 }
2397 #endif /* INET6 */
2398
2399 const char *
2400 ipsec_logsastr(sav)
2401         struct secasvar *sav;
2402 {
2403         static char buf[256];
2404         char *p;
2405         struct secasindex *saidx = &sav->sah->saidx;
2406
2407         /* validity check */
2408         if (((struct sockaddr *)&sav->sah->saidx.src)->sa_family
2409                         != ((struct sockaddr *)&sav->sah->saidx.dst)->sa_family)
2410                 panic("ipsec_logsastr: family mismatched.");
2411
2412         p = buf;
2413         snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
2414         while (p && *p)
2415                 p++;
2416         if (((struct sockaddr *)&saidx->src)->sa_family == AF_INET) {
2417                 u_int8_t *s, *d;
2418                 s = (u_int8_t *)&((struct sockaddr_in *)&saidx->src)->sin_addr;
2419                 d = (u_int8_t *)&((struct sockaddr_in *)&saidx->dst)->sin_addr;
2420                 snprintf(p, sizeof(buf) - (p - buf),
2421                         "src=%d.%d.%d.%d dst=%d.%d.%d.%d",
2422                         s[0], s[1], s[2], s[3], d[0], d[1], d[2], d[3]);
2423         }
2424 #ifdef INET6
2425         else if (((struct sockaddr *)&saidx->src)->sa_family == AF_INET6) {
2426                 snprintf(p, sizeof(buf) - (p - buf),
2427                         "src=%s",
2428                         ip6_sprintf(&((struct sockaddr_in6 *)&saidx->src)->sin6_addr));
2429                 while (p && *p)
2430                         p++;
2431                 snprintf(p, sizeof(buf) - (p - buf),
2432                         " dst=%s",
2433                         ip6_sprintf(&((struct sockaddr_in6 *)&saidx->dst)->sin6_addr));
2434         }
2435 #endif
2436         while (p && *p)
2437                 p++;
2438         snprintf(p, sizeof(buf) - (p - buf), ")");
2439
2440         return buf;
2441 }
2442
2443 void
2444 ipsec_dumpmbuf(m)
2445         struct mbuf *m;
2446 {
2447         int totlen;
2448         int i;
2449         u_char *p;
2450
2451         totlen = 0;
2452         printf("---\n");
2453         while (m) {
2454                 p = mtod(m, u_char *);
2455                 for (i = 0; i < m->m_len; i++) {
2456                         printf("%02x ", p[i]);
2457                         totlen++;
2458                         if (totlen % 16 == 0)
2459                                 printf("\n");
2460                 }
2461                 m = m->m_next;
2462         }
2463         if (totlen % 16 != 0)
2464                 printf("\n");
2465         printf("---\n");
2466 }
2467
2468 #ifdef INET
2469 /*
2470  * IPsec output logic for IPv4.
2471  */
2472 int
2473 ipsec4_output(state, sp, flags)
2474         struct ipsec_output_state *state;
2475         struct secpolicy *sp;
2476         int flags;
2477 {
2478         struct ip *ip = NULL;
2479         struct ipsecrequest *isr = NULL;
2480         struct secasindex saidx;
2481         int s;
2482         int error;
2483         struct sockaddr_in *dst4;
2484         struct sockaddr_in *sin;
2485
2486         if (!state)
2487                 panic("state == NULL in ipsec4_output");
2488         if (!state->m)
2489                 panic("state->m == NULL in ipsec4_output");
2490         if (!state->ro)
2491                 panic("state->ro == NULL in ipsec4_output");
2492         if (!state->dst)
2493                 panic("state->dst == NULL in ipsec4_output");
2494
2495         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
2496                 printf("ipsec4_output: applyed SP\n");
2497                 kdebug_secpolicy(sp));
2498
2499         for (isr = sp->req; isr != NULL; isr = isr->next) {
2500
2501 #if 0   /* give up to check restriction of transport mode */
2502         /* XXX but should be checked somewhere */
2503                 /*
2504                  * some of the IPsec operation must be performed only in
2505                  * originating case.
2506                  */
2507                 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT
2508                  && (flags & IP_FORWARDING))
2509                         continue;
2510 #endif
2511
2512                 /* make SA index for search proper SA */
2513                 ip = mtod(state->m, struct ip *);
2514                 bcopy(&isr->saidx, &saidx, sizeof(saidx));
2515                 saidx.mode = isr->saidx.mode;
2516                 saidx.reqid = isr->saidx.reqid;
2517                 sin = (struct sockaddr_in *)&saidx.src;
2518                 if (sin->sin_len == 0) {
2519                         sin->sin_len = sizeof(*sin);
2520                         sin->sin_family = AF_INET;
2521                         sin->sin_port = IPSEC_PORT_ANY;
2522                         bcopy(&ip->ip_src, &sin->sin_addr,
2523                             sizeof(sin->sin_addr));
2524                 }
2525                 sin = (struct sockaddr_in *)&saidx.dst;
2526                 if (sin->sin_len == 0) {
2527                         sin->sin_len = sizeof(*sin);
2528                         sin->sin_family = AF_INET;
2529                         sin->sin_port = IPSEC_PORT_ANY;
2530                         bcopy(&ip->ip_dst, &sin->sin_addr,
2531                             sizeof(sin->sin_addr));
2532                 }
2533
2534                 if ((error = key_checkrequest(isr, &saidx)) != 0) {
2535                         /*
2536                          * IPsec processing is required, but no SA found.
2537                          * I assume that key_acquire() had been called
2538                          * to get/establish the SA. Here I discard
2539                          * this packet because it is responsibility for
2540                          * upper layer to retransmit the packet.
2541                          */
2542                         ipsecstat.out_nosa++;
2543                         goto bad;
2544                 }
2545
2546                 /* validity check */
2547                 if (isr->sav == NULL) {
2548                         switch (ipsec_get_reqlevel(isr)) {
2549                         case IPSEC_LEVEL_USE:
2550                                 continue;
2551                         case IPSEC_LEVEL_REQUIRE:
2552                                 /* must be not reached here. */
2553                                 panic("ipsec4_output: no SA found, but required.");
2554                         }
2555                 }
2556
2557                 /*
2558                  * If there is no valid SA, we give up to process any
2559                  * more.  In such a case, the SA's status is changed
2560                  * from DYING to DEAD after allocating.  If a packet
2561                  * send to the receiver by dead SA, the receiver can
2562                  * not decode a packet because SA has been dead.
2563                  */
2564                 if (isr->sav->state != SADB_SASTATE_MATURE
2565                  && isr->sav->state != SADB_SASTATE_DYING) {
2566                         ipsecstat.out_nosa++;
2567                         error = EINVAL;
2568                         goto bad;
2569                 }
2570
2571                 /*
2572                  * There may be the case that SA status will be changed when
2573                  * we are refering to one. So calling splsoftnet().
2574                  */
2575                 s = splnet();
2576
2577                 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
2578                         /*
2579                          * build IPsec tunnel.
2580                          */
2581                         /* XXX should be processed with other familiy */
2582                         if (((struct sockaddr *)&isr->sav->sah->saidx.src)->sa_family != AF_INET) {
2583                                 ipseclog((LOG_ERR, "ipsec4_output: "
2584                                     "family mismatched between inner and outer spi=%u\n",
2585                                     (u_int32_t)ntohl(isr->sav->spi)));
2586                                 splx(s);
2587                                 error = EAFNOSUPPORT;
2588                                 goto bad;
2589                         }
2590
2591                         state->m = ipsec4_splithdr(state->m);
2592                         if (!state->m) {
2593                                 splx(s);
2594                                 error = ENOMEM;
2595                                 goto bad;
2596                         }
2597                         error = ipsec4_encapsulate(state->m, isr->sav);
2598                         splx(s);
2599                         if (error) {
2600                                 state->m = NULL;
2601                                 goto bad;
2602                         }
2603                         ip = mtod(state->m, struct ip *);
2604
2605                         state->ro = &isr->sav->sah->sa_route;
2606                         state->dst = (struct sockaddr *)&state->ro->ro_dst;
2607                         dst4 = (struct sockaddr_in *)state->dst;
2608                         if (state->ro->ro_rt
2609                          && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0
2610                           || dst4->sin_addr.s_addr != ip->ip_dst.s_addr)) {
2611                                 RTFREE(state->ro->ro_rt);
2612                                 state->ro->ro_rt = NULL;
2613                         }
2614                         if (state->ro->ro_rt == 0) {
2615                                 dst4->sin_family = AF_INET;
2616                                 dst4->sin_len = sizeof(*dst4);
2617                                 dst4->sin_addr = ip->ip_dst;
2618                                 rtalloc(state->ro);
2619                         }
2620                         if (state->ro->ro_rt == 0) {
2621                                 ipstat.ips_noroute++;
2622                                 error = EHOSTUNREACH;
2623                                 goto bad;
2624                         }
2625
2626                         /* adjust state->dst if tunnel endpoint is offlink */
2627                         if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) {
2628                                 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway;
2629                                 dst4 = (struct sockaddr_in *)state->dst;
2630                         }
2631                 } else
2632                         splx(s);
2633
2634                 state->m = ipsec4_splithdr(state->m);
2635                 if (!state->m) {
2636                         error = ENOMEM;
2637                         goto bad;
2638                 }
2639                 switch (isr->saidx.proto) {
2640                 case IPPROTO_ESP:
2641 #ifdef IPSEC_ESP
2642                         if ((error = esp4_output(state->m, isr)) != 0) {
2643                                 state->m = NULL;
2644                                 goto bad;
2645                         }
2646                         break;
2647 #else
2648                         m_freem(state->m);
2649                         state->m = NULL;
2650                         error = EINVAL;
2651                         goto bad;
2652 #endif
2653                 case IPPROTO_AH:
2654                         if ((error = ah4_output(state->m, isr)) != 0) {
2655                                 state->m = NULL;
2656                                 goto bad;
2657                         }
2658                         break;
2659                 case IPPROTO_IPCOMP:
2660                         if ((error = ipcomp4_output(state->m, isr)) != 0) {
2661                                 state->m = NULL;
2662                                 goto bad;
2663                         }
2664                         break;
2665                 default:
2666                         ipseclog((LOG_ERR,
2667                             "ipsec4_output: unknown ipsec protocol %d\n",
2668                             isr->saidx.proto));
2669                         m_freem(state->m);
2670                         state->m = NULL;
2671                         error = EINVAL;
2672                         goto bad;
2673                 }
2674
2675                 if (state->m == 0) {
2676                         error = ENOMEM;
2677                         goto bad;
2678                 }
2679                 ip = mtod(state->m, struct ip *);
2680         }
2681
2682         return 0;
2683
2684 bad:
2685         m_freem(state->m);
2686         state->m = NULL;
2687         return error;
2688 }
2689 #endif
2690
2691 #ifdef INET6
2692 /*
2693  * IPsec output logic for IPv6, transport mode.
2694  */
2695 int
2696 ipsec6_output_trans(state, nexthdrp, mprev, sp, flags, tun)
2697         struct ipsec_output_state *state;
2698         u_char *nexthdrp;
2699         struct mbuf *mprev;
2700         struct secpolicy *sp;
2701         int flags;
2702         int *tun;
2703 {
2704         struct ip6_hdr *ip6;
2705         struct ipsecrequest *isr = NULL;
2706         struct secasindex saidx;
2707         int error = 0;
2708         int plen;
2709         struct sockaddr_in6 *sin6;
2710
2711         if (!state)
2712                 panic("state == NULL in ipsec6_output_trans");
2713         if (!state->m)
2714                 panic("state->m == NULL in ipsec6_output_trans");
2715         if (!nexthdrp)
2716                 panic("nexthdrp == NULL in ipsec6_output_trans");
2717         if (!mprev)
2718                 panic("mprev == NULL in ipsec6_output_trans");
2719         if (!sp)
2720                 panic("sp == NULL in ipsec6_output_trans");
2721         if (!tun)
2722                 panic("tun == NULL in ipsec6_output_trans");
2723
2724         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
2725                 printf("ipsec6_output_trans: applyed SP\n");
2726                 kdebug_secpolicy(sp));
2727
2728         *tun = 0;
2729         for (isr = sp->req; isr; isr = isr->next) {
2730                 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
2731                         /* the rest will be handled by ipsec6_output_tunnel() */
2732                         break;
2733                 }
2734
2735                 /* make SA index for search proper SA */
2736                 ip6 = mtod(state->m, struct ip6_hdr *);
2737                 bcopy(&isr->saidx, &saidx, sizeof(saidx));
2738                 saidx.mode = isr->saidx.mode;
2739                 saidx.reqid = isr->saidx.reqid;
2740                 sin6 = (struct sockaddr_in6 *)&saidx.src;
2741                 if (sin6->sin6_len == 0) {
2742                         sin6->sin6_len = sizeof(*sin6);
2743                         sin6->sin6_family = AF_INET6;
2744                         sin6->sin6_port = IPSEC_PORT_ANY;
2745                         bcopy(&ip6->ip6_src, &sin6->sin6_addr,
2746                             sizeof(ip6->ip6_src));
2747                         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
2748                                 /* fix scope id for comparing SPD */
2749                                 sin6->sin6_addr.s6_addr16[1] = 0;
2750                                 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
2751                         }
2752                 }
2753                 sin6 = (struct sockaddr_in6 *)&saidx.dst;
2754                 if (sin6->sin6_len == 0) {
2755                         sin6->sin6_len = sizeof(*sin6);
2756                         sin6->sin6_family = AF_INET6;
2757                         sin6->sin6_port = IPSEC_PORT_ANY;
2758                         bcopy(&ip6->ip6_dst, &sin6->sin6_addr,
2759                             sizeof(ip6->ip6_dst));
2760                         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
2761                                 /* fix scope id for comparing SPD */
2762                                 sin6->sin6_addr.s6_addr16[1] = 0;
2763                                 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
2764                         }
2765                 }
2766
2767                 if (key_checkrequest(isr, &saidx) == ENOENT) {
2768                         /*
2769                          * IPsec processing is required, but no SA found.
2770                          * I assume that key_acquire() had been called
2771                          * to get/establish the SA. Here I discard
2772                          * this packet because it is responsibility for
2773                          * upper layer to retransmit the packet.
2774                          */
2775                         ipsec6stat.out_nosa++;
2776                         error = ENOENT;
2777
2778                         /*
2779                          * Notify the fact that the packet is discarded
2780                          * to ourselves. I believe this is better than
2781                          * just silently discarding. (jinmei@kame.net)
2782                          * XXX: should we restrict the error to TCP packets?
2783                          * XXX: should we directly notify sockets via
2784                          *      pfctlinputs?
2785                          */
2786                         icmp6_error(state->m, ICMP6_DST_UNREACH,
2787                                     ICMP6_DST_UNREACH_ADMIN, 0);
2788                         state->m = NULL; /* icmp6_error freed the mbuf */
2789                         goto bad;
2790                 }
2791
2792                 /* validity check */
2793                 if (isr->sav == NULL) {
2794                         switch (ipsec_get_reqlevel(isr)) {
2795                         case IPSEC_LEVEL_USE:
2796                                 continue;
2797                         case IPSEC_LEVEL_REQUIRE:
2798                                 /* must be not reached here. */
2799                                 panic("ipsec6_output_trans: no SA found, but required.");
2800                         }
2801                 }
2802
2803                 /*
2804                  * If there is no valid SA, we give up to process.
2805                  * see same place at ipsec4_output().
2806                  */
2807                 if (isr->sav->state != SADB_SASTATE_MATURE
2808                  && isr->sav->state != SADB_SASTATE_DYING) {
2809                         ipsec6stat.out_nosa++;
2810                         error = EINVAL;
2811                         goto bad;
2812                 }
2813
2814                 switch (isr->saidx.proto) {
2815                 case IPPROTO_ESP:
2816 #ifdef IPSEC_ESP
2817                         error = esp6_output(state->m, nexthdrp, mprev->m_next, isr);
2818 #else
2819                         m_freem(state->m);
2820                         error = EINVAL;
2821 #endif
2822                         break;
2823                 case IPPROTO_AH:
2824                         error = ah6_output(state->m, nexthdrp, mprev->m_next, isr);
2825                         break;
2826                 case IPPROTO_IPCOMP:
2827                         error = ipcomp6_output(state->m, nexthdrp, mprev->m_next, isr);
2828                         break;
2829                 default:
2830                         ipseclog((LOG_ERR, "ipsec6_output_trans: "
2831                             "unknown ipsec protocol %d\n", isr->saidx.proto));
2832                         m_freem(state->m);
2833                         ipsec6stat.out_inval++;
2834                         error = EINVAL;
2835                         break;
2836                 }
2837                 if (error) {
2838                         state->m = NULL;
2839                         goto bad;
2840                 }
2841                 plen = state->m->m_pkthdr.len - sizeof(struct ip6_hdr);
2842                 if (plen > IPV6_MAXPACKET) {
2843                         ipseclog((LOG_ERR, "ipsec6_output_trans: "
2844                             "IPsec with IPv6 jumbogram is not supported\n"));
2845                         ipsec6stat.out_inval++;
2846                         error = EINVAL; /* XXX */
2847                         goto bad;
2848                 }
2849                 ip6 = mtod(state->m, struct ip6_hdr *);
2850                 ip6->ip6_plen = htons(plen);
2851         }
2852
2853         /* if we have more to go, we need a tunnel mode processing */
2854         if (isr != NULL)
2855                 *tun = 1;
2856
2857         return 0;
2858
2859 bad:
2860         m_freem(state->m);
2861         state->m = NULL;
2862         return error;
2863 }
2864
2865 /*
2866  * IPsec output logic for IPv6, tunnel mode.
2867  */
2868 int
2869 ipsec6_output_tunnel(state, sp, flags)
2870         struct ipsec_output_state *state;
2871         struct secpolicy *sp;
2872         int flags;
2873 {
2874         struct ip6_hdr *ip6;
2875         struct ipsecrequest *isr = NULL;
2876         struct secasindex saidx;
2877         int error = 0;
2878         int plen;
2879         struct sockaddr_in6* dst6;
2880         int s;
2881
2882         if (!state)
2883                 panic("state == NULL in ipsec6_output_tunnel");
2884         if (!state->m)
2885                 panic("state->m == NULL in ipsec6_output_tunnel");
2886         if (!sp)
2887                 panic("sp == NULL in ipsec6_output_tunnel");
2888
2889         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
2890                 printf("ipsec6_output_tunnel: applyed SP\n");
2891                 kdebug_secpolicy(sp));
2892
2893         /*
2894          * transport mode ipsec (before the 1st tunnel mode) is already
2895          * processed by ipsec6_output_trans().
2896          */
2897         for (isr = sp->req; isr; isr = isr->next) {
2898                 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
2899                         break;
2900         }
2901
2902         for (/* already initialized */; isr; isr = isr->next) {
2903                 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
2904                         /* When tunnel mode, SA peers must be specified. */
2905                         bcopy(&isr->saidx, &saidx, sizeof(saidx));
2906                 } else {
2907                         /* make SA index to look for a proper SA */
2908                         struct sockaddr_in6 *sin6;
2909
2910                         bzero(&saidx, sizeof(saidx));
2911                         saidx.proto = isr->saidx.proto;
2912                         saidx.mode = isr->saidx.mode;
2913                         saidx.reqid = isr->saidx.reqid;
2914
2915                         ip6 = mtod(state->m, struct ip6_hdr *);
2916                         sin6 = (struct sockaddr_in6 *)&saidx.src;
2917                         if (sin6->sin6_len == 0) {
2918                                 sin6->sin6_len = sizeof(*sin6);
2919                                 sin6->sin6_family = AF_INET6;
2920                                 sin6->sin6_port = IPSEC_PORT_ANY;
2921                                 bcopy(&ip6->ip6_src, &sin6->sin6_addr,
2922                                     sizeof(ip6->ip6_src));
2923                                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
2924                                         /* fix scope id for comparing SPD */
2925                                         sin6->sin6_addr.s6_addr16[1] = 0;
2926                                         sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
2927                                 }
2928                         }
2929                         sin6 = (struct sockaddr_in6 *)&saidx.dst;
2930                         if (sin6->sin6_len == 0) {
2931                                 sin6->sin6_len = sizeof(*sin6);
2932                                 sin6->sin6_family = AF_INET6;
2933                                 sin6->sin6_port = IPSEC_PORT_ANY;
2934                                 bcopy(&ip6->ip6_dst, &sin6->sin6_addr,
2935                                     sizeof(ip6->ip6_dst));
2936                                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
2937                                         /* fix scope id for comparing SPD */
2938                                         sin6->sin6_addr.s6_addr16[1] = 0;
2939                                         sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
2940                                 }
2941                         }
2942                 }
2943
2944                 if (key_checkrequest(isr, &saidx) == ENOENT) {
2945                         /*
2946                          * IPsec processing is required, but no SA found.
2947                          * I assume that key_acquire() had been called
2948                          * to get/establish the SA. Here I discard
2949                          * this packet because it is responsibility for
2950                          * upper layer to retransmit the packet.
2951                          */
2952                         ipsec6stat.out_nosa++;
2953                         error = ENOENT;
2954                         goto bad;
2955                 }
2956
2957                 /* validity check */
2958                 if (isr->sav == NULL) {
2959                         switch (ipsec_get_reqlevel(isr)) {
2960                         case IPSEC_LEVEL_USE:
2961                                 continue;
2962                         case IPSEC_LEVEL_REQUIRE:
2963                                 /* must be not reached here. */
2964                                 panic("ipsec6_output_tunnel: no SA found, but required.");
2965                         }
2966                 }
2967
2968                 /*
2969                  * If there is no valid SA, we give up to process.
2970                  * see same place at ipsec4_output().
2971                  */
2972                 if (isr->sav->state != SADB_SASTATE_MATURE
2973                  && isr->sav->state != SADB_SASTATE_DYING) {
2974                         ipsec6stat.out_nosa++;
2975                         error = EINVAL;
2976                         goto bad;
2977                 }
2978
2979                 /*
2980                  * There may be the case that SA status will be changed when
2981                  * we are refering to one. So calling splsoftnet().
2982                  */
2983                 s = splnet();
2984
2985                 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
2986                         /*
2987                          * build IPsec tunnel.
2988                          */
2989                         /* XXX should be processed with other familiy */
2990                         if (((struct sockaddr *)&isr->sav->sah->saidx.src)->sa_family != AF_INET6) {
2991                                 ipseclog((LOG_ERR, "ipsec6_output_tunnel: "
2992                                     "family mismatched between inner and outer, spi=%u\n",
2993                                     (u_int32_t)ntohl(isr->sav->spi)));
2994                                 splx(s);
2995                                 ipsec6stat.out_inval++;
2996                                 error = EAFNOSUPPORT;
2997                                 goto bad;
2998                         }
2999
3000                         state->m = ipsec6_splithdr(state->m);
3001                         if (!state->m) {
3002                                 splx(s);
3003                                 ipsec6stat.out_nomem++;
3004                                 error = ENOMEM;
3005                                 goto bad;
3006                         }
3007                         error = ipsec6_encapsulate(state->m, isr->sav);
3008                         splx(s);
3009                         if (error) {
3010                                 state->m = 0;
3011                                 goto bad;
3012                         }
3013                         ip6 = mtod(state->m, struct ip6_hdr *);
3014
3015                         state->ro = &isr->sav->sah->sa_route;
3016                         state->dst = (struct sockaddr *)&state->ro->ro_dst;
3017                         dst6 = (struct sockaddr_in6 *)state->dst;
3018                         if (state->ro->ro_rt
3019                          && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0
3020                           || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) {
3021                                 RTFREE(state->ro->ro_rt);
3022                                 state->ro->ro_rt = NULL;
3023                         }
3024                         if (state->ro->ro_rt == 0) {
3025                                 bzero(dst6, sizeof(*dst6));
3026                                 dst6->sin6_family = AF_INET6;
3027                                 dst6->sin6_len = sizeof(*dst6);
3028                                 dst6->sin6_addr = ip6->ip6_dst;
3029                                 rtalloc(state->ro);
3030                         }
3031                         if (state->ro->ro_rt == 0) {
3032                                 ip6stat.ip6s_noroute++;
3033                                 ipsec6stat.out_noroute++;
3034                                 error = EHOSTUNREACH;
3035                                 goto bad;
3036                         }
3037
3038                         /* adjust state->dst if tunnel endpoint is offlink */
3039                         if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) {
3040                                 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway;
3041                                 dst6 = (struct sockaddr_in6 *)state->dst;
3042                         }
3043                 } else
3044                         splx(s);
3045
3046                 state->m = ipsec6_splithdr(state->m);
3047                 if (!state->m) {
3048                         ipsec6stat.out_nomem++;
3049                         error = ENOMEM;
3050                         goto bad;
3051                 }
3052                 ip6 = mtod(state->m, struct ip6_hdr *);
3053                 switch (isr->saidx.proto) {
3054                 case IPPROTO_ESP:
3055 #ifdef IPSEC_ESP
3056                         error = esp6_output(state->m, &ip6->ip6_nxt, state->m->m_next, isr);
3057 #else
3058                         m_freem(state->m);
3059                         error = EINVAL;
3060 #endif
3061                         break;
3062                 case IPPROTO_AH:
3063                         error = ah6_output(state->m, &ip6->ip6_nxt, state->m->m_next, isr);
3064                         break;
3065                 case IPPROTO_IPCOMP:
3066                         /* XXX code should be here */
3067                         /* FALLTHROUGH */
3068                 default:
3069                         ipseclog((LOG_ERR, "ipsec6_output_tunnel: "
3070                             "unknown ipsec protocol %d\n", isr->saidx.proto));
3071                         m_freem(state->m);
3072                         ipsec6stat.out_inval++;
3073                         error = EINVAL;
3074                         break;
3075                 }
3076                 if (error) {
3077                         state->m = NULL;
3078                         goto bad;
3079                 }
3080                 plen = state->m->m_pkthdr.len - sizeof(struct ip6_hdr);
3081                 if (plen > IPV6_MAXPACKET) {
3082                         ipseclog((LOG_ERR, "ipsec6_output_tunnel: "
3083                             "IPsec with IPv6 jumbogram is not supported\n"));
3084                         ipsec6stat.out_inval++;
3085                         error = EINVAL; /* XXX */
3086                         goto bad;
3087                 }
3088                 ip6 = mtod(state->m, struct ip6_hdr *);
3089                 ip6->ip6_plen = htons(plen);
3090         }
3091
3092         return 0;
3093
3094 bad:
3095         m_freem(state->m);
3096         state->m = NULL;
3097         return error;
3098 }
3099 #endif /* INET6 */
3100
3101 #ifdef INET
3102 /*
3103  * Chop IP header and option off from the payload.
3104  */
3105 static struct mbuf *
3106 ipsec4_splithdr(m)
3107         struct mbuf *m;
3108 {
3109         struct mbuf *mh;
3110         struct ip *ip;
3111         int hlen;
3112
3113         if (m->m_len < sizeof(struct ip))
3114                 panic("ipsec4_splithdr: first mbuf too short");
3115         ip = mtod(m, struct ip *);
3116 #ifdef _IP_VHL
3117         hlen = _IP_VHL_HL(ip->ip_vhl) << 2;
3118 #else
3119         hlen = ip->ip_hl << 2;
3120 #endif
3121         if (m->m_len > hlen) {
3122                 MGETHDR(mh, M_DONTWAIT, MT_HEADER);
3123                 if (!mh) {
3124                         m_freem(m);
3125                         return NULL;
3126                 }
3127                 M_MOVE_PKTHDR(mh, m);
3128                 MH_ALIGN(mh, hlen);
3129                 m->m_len -= hlen;
3130                 m->m_data += hlen;
3131                 mh->m_next = m;
3132                 m = mh;
3133                 m->m_len = hlen;
3134                 bcopy((caddr_t)ip, mtod(m, caddr_t), hlen);
3135         } else if (m->m_len < hlen) {
3136                 m = m_pullup(m, hlen);
3137                 if (!m)
3138                         return NULL;
3139         }
3140         return m;
3141 }
3142 #endif
3143
3144 #ifdef INET6
3145 static struct mbuf *
3146 ipsec6_splithdr(m)
3147         struct mbuf *m;
3148 {
3149         struct mbuf *mh;
3150         struct ip6_hdr *ip6;
3151         int hlen;
3152
3153         if (m->m_len < sizeof(struct ip6_hdr))
3154                 panic("ipsec6_splithdr: first mbuf too short");
3155         ip6 = mtod(m, struct ip6_hdr *);
3156         hlen = sizeof(struct ip6_hdr);
3157         if (m->m_len > hlen) {
3158                 MGETHDR(mh, M_DONTWAIT, MT_HEADER);
3159                 if (!mh) {
3160                         m_freem(m);
3161                         return NULL;
3162                 }
3163                 M_MOVE_PKTHDR(mh, m);
3164                 MH_ALIGN(mh, hlen);
3165                 m->m_len -= hlen;
3166                 m->m_data += hlen;
3167                 mh->m_next = m;
3168                 m = mh;
3169                 m->m_len = hlen;
3170                 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen);
3171         } else if (m->m_len < hlen) {
3172                 m = m_pullup(m, hlen);
3173                 if (!m)
3174                         return NULL;
3175         }
3176         return m;
3177 }
3178 #endif
3179
3180 /* validate inbound IPsec tunnel packet. */
3181 int
3182 ipsec4_tunnel_validate(m, off, nxt0, sav)
3183         struct mbuf *m;         /* no pullup permitted, m->m_len >= ip */
3184         int off;
3185         u_int nxt0;
3186         struct secasvar *sav;
3187 {
3188         u_int8_t nxt = nxt0 & 0xff;
3189         struct sockaddr_in *sin;
3190         struct sockaddr_in osrc, odst, isrc, idst;
3191         int hlen;
3192         struct secpolicy *sp;
3193         struct ip *oip;
3194
3195 #ifdef DIAGNOSTIC
3196         if (m->m_len < sizeof(struct ip))
3197                 panic("too short mbuf on ipsec4_tunnel_validate");
3198 #endif
3199         if (nxt != IPPROTO_IPV4)
3200                 return 0;
3201         if (m->m_pkthdr.len < off + sizeof(struct ip))
3202                 return 0;
3203         /* do not decapsulate if the SA is for transport mode only */
3204         if (sav->sah->saidx.mode == IPSEC_MODE_TRANSPORT)
3205                 return 0;
3206
3207         oip = mtod(m, struct ip *);
3208 #ifdef _IP_VHL
3209         hlen = _IP_VHL_HL(oip->ip_vhl) << 2;
3210 #else
3211         hlen = oip->ip_hl << 2;
3212 #endif
3213         if (hlen != sizeof(struct ip))
3214                 return 0;
3215
3216         /* AF_INET6 should be supported, but at this moment we don't. */
3217         sin = (struct sockaddr_in *)&sav->sah->saidx.dst;
3218         if (sin->sin_family != AF_INET)
3219                 return 0;
3220         if (bcmp(&oip->ip_dst, &sin->sin_addr, sizeof(oip->ip_dst)) != 0)
3221                 return 0;
3222
3223         /* XXX slow */
3224         bzero(&osrc, sizeof(osrc));
3225         bzero(&odst, sizeof(odst));
3226         bzero(&isrc, sizeof(isrc));
3227         bzero(&idst, sizeof(idst));
3228         osrc.sin_family = odst.sin_family = isrc.sin_family = idst.sin_family =
3229             AF_INET;
3230         osrc.sin_len = odst.sin_len = isrc.sin_len = idst.sin_len =
3231             sizeof(struct sockaddr_in);
3232         osrc.sin_addr = oip->ip_src;
3233         odst.sin_addr = oip->ip_dst;
3234         m_copydata(m, off + offsetof(struct ip, ip_src), sizeof(isrc.sin_addr),
3235             (caddr_t)&isrc.sin_addr);
3236         m_copydata(m, off + offsetof(struct ip, ip_dst), sizeof(idst.sin_addr),
3237             (caddr_t)&idst.sin_addr);
3238
3239         /*
3240          * RFC2401 5.2.1 (b): (assume that we are using tunnel mode)
3241          * - if the inner destination is multicast address, there can be
3242          *   multiple permissible inner source address.  implementation
3243          *   may want to skip verification of inner source address against
3244          *   SPD selector.
3245          * - if the inner protocol is ICMP, the packet may be an error report
3246          *   from routers on the other side of the VPN cloud (R in the
3247          *   following diagram).  in this case, we cannot verify inner source
3248          *   address against SPD selector.
3249          *      me -- gw === gw -- R -- you
3250          *
3251          * we consider the first bullet to be users responsibility on SPD entry
3252          * configuration (if you need to encrypt multicast traffic, set
3253          * the source range of SPD selector to 0.0.0.0/0, or have explicit
3254          * address ranges for possible senders).
3255          * the second bullet is not taken care of (yet).
3256          *
3257          * therefore, we do not do anything special about inner source.
3258          */
3259
3260         sp = key_gettunnel((struct sockaddr *)&osrc, (struct sockaddr *)&odst,
3261             (struct sockaddr *)&isrc, (struct sockaddr *)&idst);
3262         if (!sp)
3263                 return 0;
3264         key_freesp(sp);
3265
3266         return 1;
3267 }
3268
3269 #ifdef INET6
3270 /* validate inbound IPsec tunnel packet. */
3271 int
3272 ipsec6_tunnel_validate(m, off, nxt0, sav)
3273         struct mbuf *m;         /* no pullup permitted, m->m_len >= ip */
3274         int off;
3275         u_int nxt0;
3276         struct secasvar *sav;
3277 {
3278         u_int8_t nxt = nxt0 & 0xff;
3279         struct sockaddr_in6 *sin6;
3280         struct sockaddr_in6 osrc, odst, isrc, idst;
3281         struct secpolicy *sp;
3282         struct ip6_hdr *oip6;
3283
3284 #ifdef DIAGNOSTIC
3285         if (m->m_len < sizeof(struct ip6_hdr))
3286                 panic("too short mbuf on ipsec6_tunnel_validate");
3287 #endif
3288         if (nxt != IPPROTO_IPV6)
3289                 return 0;
3290         if (m->m_pkthdr.len < off + sizeof(struct ip6_hdr))
3291                 return 0;
3292         /* do not decapsulate if the SA is for transport mode only */
3293         if (sav->sah->saidx.mode == IPSEC_MODE_TRANSPORT)
3294                 return 0;
3295
3296         oip6 = mtod(m, struct ip6_hdr *);
3297         /* AF_INET should be supported, but at this moment we don't. */
3298         sin6 = (struct sockaddr_in6 *)&sav->sah->saidx.dst;
3299         if (sin6->sin6_family != AF_INET6)
3300                 return 0;
3301         if (!IN6_ARE_ADDR_EQUAL(&oip6->ip6_dst, &sin6->sin6_addr))
3302                 return 0;
3303
3304         /* XXX slow */
3305         bzero(&osrc, sizeof(osrc));
3306         bzero(&odst, sizeof(odst));
3307         bzero(&isrc, sizeof(isrc));
3308         bzero(&idst, sizeof(idst));
3309         osrc.sin6_family = odst.sin6_family = isrc.sin6_family =
3310             idst.sin6_family = AF_INET6;
3311         osrc.sin6_len = odst.sin6_len = isrc.sin6_len = idst.sin6_len =
3312             sizeof(struct sockaddr_in6);
3313         osrc.sin6_addr = oip6->ip6_src;
3314         odst.sin6_addr = oip6->ip6_dst;
3315         m_copydata(m, off + offsetof(struct ip6_hdr, ip6_src),
3316             sizeof(isrc.sin6_addr), (caddr_t)&isrc.sin6_addr);
3317         m_copydata(m, off + offsetof(struct ip6_hdr, ip6_dst),
3318             sizeof(idst.sin6_addr), (caddr_t)&idst.sin6_addr);
3319
3320         /*
3321          * regarding to inner source address validation, see a long comment
3322          * in ipsec4_tunnel_validate.
3323          */
3324
3325         sp = key_gettunnel((struct sockaddr *)&osrc, (struct sockaddr *)&odst,
3326             (struct sockaddr *)&isrc, (struct sockaddr *)&idst);
3327         /*
3328          * when there is no suitable inbound policy for the packet of the ipsec
3329          * tunnel mode, the kernel never decapsulate the tunneled packet
3330          * as the ipsec tunnel mode even when the system wide policy is "none".
3331          * then the kernel leaves the generic tunnel module to process this
3332          * packet.  if there is no rule of the generic tunnel, the packet
3333          * is rejected and the statistics will be counted up.
3334          */
3335         if (!sp)
3336                 return 0;
3337         key_freesp(sp);
3338
3339         return 1;
3340 }
3341 #endif
3342
3343 /*
3344  * Make a mbuf chain for encryption.
3345  * If the original mbuf chain contains a mbuf with a cluster,
3346  * allocate a new cluster and copy the data to the new cluster.
3347  * XXX: this hack is inefficient, but is necessary to handle cases
3348  * of TCP retransmission...
3349  */
3350 struct mbuf *
3351 ipsec_copypkt(m)
3352         struct mbuf *m;
3353 {
3354         struct mbuf *n, **mpp, *mnew;
3355
3356         for (n = m, mpp = &m; n; n = n->m_next) {
3357                 if (n->m_flags & M_EXT) {
3358                         /*
3359                          * Make a copy only if there are more than one references
3360                          * to the cluster.
3361                          * XXX: is this approach effective?
3362                          */
3363                         if (
3364                                 n->m_ext.ext_free ||
3365                                 mclrefcnt[mtocl(n->m_ext.ext_buf)] > 1
3366                             )
3367                         {
3368                                 int remain, copied;
3369                                 struct mbuf *mm;
3370
3371                                 if (n->m_flags & M_PKTHDR) {
3372                                         MGETHDR(mnew, M_DONTWAIT, MT_HEADER);
3373                                         if (mnew == NULL)
3374                                                 goto fail;
3375                                         if (!m_dup_pkthdr(mnew, n, M_DONTWAIT)) {
3376                                                 m_free(mnew);
3377                                                 goto fail;
3378                                         }
3379                                 }
3380                                 else {
3381                                         MGET(mnew, M_DONTWAIT, MT_DATA);
3382                                         if (mnew == NULL)
3383                                                 goto fail;
3384                                 }
3385                                 mnew->m_len = 0;
3386                                 mm = mnew;
3387
3388                                 /*
3389                                  * Copy data. If we don't have enough space to
3390                                  * store the whole data, allocate a cluster
3391                                  * or additional mbufs.
3392                                  * XXX: we don't use m_copyback(), since the
3393                                  * function does not use clusters and thus is
3394                                  * inefficient.
3395                                  */
3396                                 remain = n->m_len;
3397                                 copied = 0;
3398                                 while (1) {
3399                                         int len;
3400                                         struct mbuf *mn;
3401
3402                                         if (remain <= (mm->m_flags & M_PKTHDR ? MHLEN : MLEN))
3403                                                 len = remain;
3404                                         else { /* allocate a cluster */
3405                                                 MCLGET(mm, M_DONTWAIT);
3406                                                 if (!(mm->m_flags & M_EXT)) {
3407                                                         m_free(mm);
3408                                                         goto fail;
3409                                                 }
3410                                                 len = remain < MCLBYTES ?
3411                                                         remain : MCLBYTES;
3412                                         }
3413
3414                                         bcopy(n->m_data + copied, mm->m_data,
3415                                               len);
3416
3417                                         copied += len;
3418                                         remain -= len;
3419                                         mm->m_len = len;
3420
3421                                         if (remain <= 0) /* completed? */
3422                                                 break;
3423
3424                                         /* need another mbuf */
3425                                         MGETHDR(mn, M_DONTWAIT, MT_HEADER);
3426                                         if (mn == NULL)
3427                                                 goto fail;
3428                                         mn->m_pkthdr.rcvif = NULL;
3429                                         mm->m_next = mn;
3430                                         mm = mn;
3431                                 }
3432
3433                                 /* adjust chain */
3434                                 mm->m_next = m_free(n);
3435                                 n = mm;
3436                                 *mpp = mnew;
3437                                 mpp = &n->m_next;
3438
3439                                 continue;
3440                         }
3441                 }
3442                 *mpp = n;
3443                 mpp = &n->m_next;
3444         }
3445
3446         return(m);
3447   fail:
3448         m_freem(m);
3449         return(NULL);
3450 }
3451
3452 void
3453 ipsec_delaux(m)
3454         struct mbuf *m;
3455 {
3456         struct m_tag *tag;
3457
3458         while ((tag = m_tag_find(m, PACKET_TAG_IPSEC_HISTORY, NULL)) != NULL)
3459                 m_tag_delete(m, tag);
3460 }
3461
3462 int
3463 ipsec_addhist(m, proto, spi)
3464         struct mbuf *m;
3465         int proto;
3466         u_int32_t spi;
3467 {
3468         struct m_tag *tag;
3469         struct ipsec_history *p;
3470
3471         tag = m_tag_get(PACKET_TAG_IPSEC_HISTORY,
3472                         sizeof (struct ipsec_history), M_NOWAIT);
3473         if (tag == NULL)
3474                 return ENOBUFS;
3475         p = (struct ipsec_history *)(tag+1);
3476         bzero(p, sizeof(*p));
3477         p->ih_proto = proto;
3478         p->ih_spi = spi;
3479         m_tag_prepend(m, tag);
3480         return 0;
3481 }
3482
3483 struct ipsec_history *
3484 ipsec_gethist(m, lenp)
3485         struct mbuf *m;
3486         int *lenp;
3487 {
3488         struct m_tag *tag;
3489
3490         tag = m_tag_find(m, PACKET_TAG_IPSEC_HISTORY, NULL);
3491         if (tag == NULL)
3492                 return NULL;
3493         /* XXX NB: noone uses this so fake it */
3494         if (lenp)
3495                 *lenp = sizeof (struct ipsec_history);
3496         return ((struct ipsec_history *)(tag+1));
3497 }