sys/netproto/ipsec/ipsec.c

   1 /*      $FreeBSD: src/sys/netipsec/ipsec.c,v 1.2.2.1 2003/01/24 05:11:35 sam Exp $      */
   2 /*      $DragonFly: src/sys/netproto/ipsec/ipsec.c,v 1.18 2006/12/20 18:14:44 dillon Exp $      */
   3 /*      $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */
   4
   5 /*
   6  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the project nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * IPsec controller part.
  36  */
  37
  38 #include "opt_inet.h"
  39 #include "opt_inet6.h"
  40 #include "opt_ipsec.h"
  41
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #include <sys/malloc.h>
  45 #include <sys/mbuf.h>
  46 #include <sys/domain.h>
  47 #include <sys/protosw.h>
  48 #include <sys/socket.h>
  49 #include <sys/socketvar.h>
  50 #include <sys/errno.h>
  51 #include <sys/time.h>
  52 #include <sys/kernel.h>
  53 #include <sys/syslog.h>
  54 #include <sys/sysctl.h>
  55 #include <sys/proc.h>
  56 #include <sys/in_cksum.h>
  57
  58 #include <net/if.h>
  59 #include <net/route.h>
  60
  61 #include <netinet/in.h>
  62 #include <netinet/in_systm.h>
  63 #include <netinet/ip.h>
  64 #include <netinet/ip_var.h>
  65 #include <netinet/in_var.h>
  66 #include <netinet/udp.h>
  67 #include <netinet/udp_var.h>
  68 #include <netinet/tcp.h>
  69 #include <netinet/udp.h>
  70
  71 #include <netinet/ip6.h>
  72 #ifdef INET6
  73 #include <netinet6/ip6_var.h>
  74 #endif
  75 #include <netinet/in_pcb.h>
  76 #ifdef INET6
  77 #include <netinet/icmp6.h>
  78 #endif
  79
  80 #include <netproto/ipsec/ipsec.h>
  81 #ifdef INET6
  82 #include <netproto/ipsec/ipsec6.h>
  83 #endif
  84 #include <netproto/ipsec/ah_var.h>
  85 #include <netproto/ipsec/esp_var.h>
  86 #include <netproto/ipsec/ipcomp.h>              /*XXX*/
  87 #include <netproto/ipsec/ipcomp_var.h>
  88
  89 #include <netproto/ipsec/key.h>
  90 #include <netproto/ipsec/keydb.h>
  91 #include <netproto/ipsec/key_debug.h>
  92
  93 #include <netproto/ipsec/xform.h>
  94
  95 #include <net/net_osdep.h>
  96
  97 #ifdef IPSEC_DEBUG
  98 int ipsec_debug = 1;
  99 #else
 100 int ipsec_debug = 0;
 101 #endif
 102
 103 /* NB: name changed so netstat doesn't use it */
 104 struct newipsecstat newipsecstat;
 105 int ip4_ah_offsetmask = 0;      /* maybe IP_DF? */
 106 int ip4_ipsec_dfbit = 0;        /* DF bit on encap. 0: clear 1: set 2: copy */
 107 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE;
 108 int ip4_esp_net_deflev = IPSEC_LEVEL_USE;
 109 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE;
 110 int ip4_ah_net_deflev = IPSEC_LEVEL_USE;
 111 struct secpolicy ip4_def_policy;
 112 int ip4_ipsec_ecn = 0;          /* ECN ignore(-1)/forbidden(0)/allowed(1) */
 113 int ip4_esp_randpad = -1;
 114 /*
 115  * Crypto support requirements:
 116  *
 117  *  1   require hardware support
 118  * -1   require software support
 119  *  0   take anything
 120  */
 121 int     crypto_support = 0;
 122
 123 SYSCTL_DECL(_net_inet_ipsec);
 124
 125 /* net.inet.ipsec */
 126 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY,
 127         def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
 128 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
 129         CTLFLAG_RW, &ip4_esp_trans_deflev,      0, "");
 130 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
 131         CTLFLAG_RW, &ip4_esp_net_deflev,        0, "");
 132 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
 133         CTLFLAG_RW, &ip4_ah_trans_deflev,       0, "");
 134 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
 135         CTLFLAG_RW, &ip4_ah_net_deflev, 0, "");
 136 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS,
 137         ah_cleartos, CTLFLAG_RW,        &ah_cleartos,   0, "");
 138 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK,
 139         ah_offsetmask, CTLFLAG_RW,      &ip4_ah_offsetmask,     0, "");
 140 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT,
 141         dfbit, CTLFLAG_RW,      &ip4_ipsec_dfbit,       0, "");
 142 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN,
 143         ecn, CTLFLAG_RW,        &ip4_ipsec_ecn, 0, "");
 144 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG,
 145         debug, CTLFLAG_RW,      &ipsec_debug,   0, "");
 146 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD,
 147         esp_randpad, CTLFLAG_RW,        &ip4_esp_randpad,       0, "");
 148 SYSCTL_INT(_net_inet_ipsec, OID_AUTO,
 149         crypto_support, CTLFLAG_RW,     &crypto_support,0, "");
 150 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO,
 151         ipsecstats,     CTLFLAG_RD,     &newipsecstat,  newipsecstat, "");
 152
 153 #ifdef INET6
 154 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE;
 155 int ip6_esp_net_deflev = IPSEC_LEVEL_USE;
 156 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
 157 int ip6_ah_net_deflev = IPSEC_LEVEL_USE;
 158 int ip6_ipsec_ecn = 0;          /* ECN ignore(-1)/forbidden(0)/allowed(1) */
 159 int ip6_esp_randpad = -1;
 160
 161 SYSCTL_DECL(_net_inet6_ipsec6);
 162
 163 /* net.inet6.ipsec6 */
 164 #ifdef COMPAT_KAME
 165 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD,
 166         0,0, compat_ipsecstats_sysctl, "S", "");
 167 #endif /* COMPAT_KAME */
 168 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
 169         def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
 170 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
 171         CTLFLAG_RW, &ip6_esp_trans_deflev,      0, "");
 172 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
 173         CTLFLAG_RW, &ip6_esp_net_deflev,        0, "");
 174 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
 175         CTLFLAG_RW, &ip6_ah_trans_deflev,       0, "");
 176 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
 177         CTLFLAG_RW, &ip6_ah_net_deflev, 0, "");
 178 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
 179         ecn, CTLFLAG_RW,        &ip6_ipsec_ecn, 0, "");
 180 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG,
 181         debug, CTLFLAG_RW,      &ipsec_debug,   0, "");
 182 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD,
 183         esp_randpad, CTLFLAG_RW,        &ip6_esp_randpad,       0, "");
 184 #endif /* INET6 */
 185
 186 static int ipsec4_setspidx_inpcb (struct mbuf *, struct inpcb *pcb);
 187 #ifdef INET6
 188 static int ipsec6_setspidx_in6pcb (struct mbuf *, struct in6pcb *pcb);
 189 #endif
 190 static int ipsec_setspidx (struct mbuf *, struct secpolicyindex *, int);
 191 static void ipsec4_get_ulp (struct mbuf *m, struct secpolicyindex *, int);
 192 static int ipsec4_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *);
 193 #ifdef INET6
 194 static void ipsec6_get_ulp (struct mbuf *m, struct secpolicyindex *, int);
 195 static int ipsec6_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *);
 196 #endif
 197 static void ipsec_delpcbpolicy (struct inpcbpolicy *);
 198 static struct secpolicy *ipsec_deepcopy_policy (struct secpolicy *src);
 199 static int ipsec_set_policy (struct secpolicy **pcb_sp,
 200         int optname, caddr_t request, size_t len, int priv);
 201 static int ipsec_get_policy (struct secpolicy *pcb_sp, struct mbuf **mp);
 202 static void vshiftl (unsigned char *, int, int);
 203 static size_t ipsec_hdrsiz (struct secpolicy *);
 204
 205 /*
 206  * Return a held reference to the default SP.
 207  */
 208 static struct secpolicy *
 209 key_allocsp_default(const char* where, int tag)
 210 {
 211         struct secpolicy *sp;
 212
 213         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 214                 printf("DP key_allocsp_default from %s:%u\n", where, tag));
 215
 216         sp = &ip4_def_policy;
 217         if (sp->policy != IPSEC_POLICY_DISCARD &&
 218             sp->policy != IPSEC_POLICY_NONE) {
 219                 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n",
 220                     sp->policy, IPSEC_POLICY_NONE));
 221                 sp->policy = IPSEC_POLICY_NONE;
 222         }
 223         sp->refcnt++;
 224
 225         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 226                 printf("DP key_allocsp_default returns SP:%p (%u)\n",
 227                         sp, sp->refcnt));
 228         return sp;
 229 }
 230 #define KEY_ALLOCSP_DEFAULT() \
 231         key_allocsp_default(__FILE__, __LINE__)
 232
 233 /*
 234  * For OUTBOUND packet having a socket. Searching SPD for packet,
 235  * and return a pointer to SP.
 236  * OUT: NULL:   no apropreate SP found, the following value is set to error.
 237  *              0       : bypass
 238  *              EACCES  : discard packet.
 239  *              ENOENT  : ipsec_acquire() in progress, maybe.
 240  *              others  : error occured.
 241  *      others: a pointer to SP
 242  *
 243  * NOTE: IPv6 mapped adddress concern is implemented here.
 244  */
 245 struct secpolicy *
 246 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir)
 247 {
 248         struct secpolicy *sp;
 249
 250         KASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi"));
 251         KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
 252                 ("ipsec_getpolicy: invalid direction %u", dir));
 253
 254         sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir);
 255         if (sp == NULL)                 /*XXX????*/
 256                 sp = KEY_ALLOCSP_DEFAULT();
 257         KASSERT(sp != NULL, ("ipsec_getpolicy: null SP"));
 258         return sp;
 259 }
 260
 261 /*
 262  * For OUTBOUND packet having a socket. Searching SPD for packet,
 263  * and return a pointer to SP.
 264  * OUT: NULL:   no apropreate SP found, the following value is set to error.
 265  *              0       : bypass
 266  *              EACCES  : discard packet.
 267  *              ENOENT  : ipsec_acquire() in progress, maybe.
 268  *              others  : error occured.
 269  *      others: a pointer to SP
 270  *
 271  * NOTE: IPv6 mapped adddress concern is implemented here.
 272  */
 273 struct secpolicy *
 274 ipsec_getpolicybysock(struct mbuf *m, u_int dir, struct inpcb *inp,
 275                       int *error)
 276 {
 277         struct inpcbpolicy *pcbsp = NULL;
 278         struct secpolicy *currsp = NULL;        /* policy on socket */
 279         struct secpolicy *sp;
 280         int af;
 281
 282         KASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf"));
 283         KASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb"));
 284         KASSERT(error != NULL, ("ipsec_getpolicybysock: null error"));
 285         KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
 286                 ("ipsec_getpolicybysock: invalid direction %u", dir));
 287
 288         af = inp->inp_socket->so_proto->pr_domain->dom_family;
 289         KASSERT(af == AF_INET || af == AF_INET6,
 290                 ("ipsec_getpolicybysock: unexpected protocol family %u", af));
 291
 292         switch (af) {
 293         case AF_INET:
 294                 /* set spidx in pcb */
 295                 *error = ipsec4_setspidx_inpcb(m, inp);
 296                 pcbsp = inp->inp_sp;
 297                 break;
 298 #ifdef INET6
 299         case AF_INET6:
 300                 /* set spidx in pcb */
 301                 *error = ipsec6_setspidx_in6pcb(m, inp);
 302                 pcbsp = inp->in6p_sp;
 303                 break;
 304 #endif
 305         default:
 306                 *error = EPFNOSUPPORT;
 307                 break;
 308         }
 309         if (*error)
 310                 return NULL;
 311
 312         KASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp"));
 313         switch (dir) {
 314         case IPSEC_DIR_INBOUND:
 315                 currsp = pcbsp->sp_in;
 316                 break;
 317         case IPSEC_DIR_OUTBOUND:
 318                 currsp = pcbsp->sp_out;
 319                 break;
 320         }
 321         KASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp"));
 322
 323         if (pcbsp->priv) {                      /* when privilieged socket */
 324                 switch (currsp->policy) {
 325                 case IPSEC_POLICY_BYPASS:
 326                 case IPSEC_POLICY_IPSEC:
 327                         currsp->refcnt++;
 328                         sp = currsp;
 329                         break;
 330
 331                 case IPSEC_POLICY_ENTRUST:
 332                         /* look for a policy in SPD */
 333                         sp = KEY_ALLOCSP(&currsp->spidx, dir);
 334                         if (sp == NULL)         /* no SP found */
 335                                 sp = KEY_ALLOCSP_DEFAULT();
 336                         break;
 337
 338                 default:
 339                         ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
 340                               "Invalid policy for PCB %d\n", currsp->policy));
 341                         *error = EINVAL;
 342                         return NULL;
 343                 }
 344         } else {                                /* unpriv, SPD has policy */
 345                 sp = KEY_ALLOCSP(&currsp->spidx, dir);
 346                 if (sp == NULL) {               /* no SP found */
 347                         switch (currsp->policy) {
 348                         case IPSEC_POLICY_BYPASS:
 349                                 ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
 350                                        "Illegal policy for non-priviliged defined %d\n",
 351                                         currsp->policy));
 352                                 *error = EINVAL;
 353                                 return NULL;
 354
 355                         case IPSEC_POLICY_ENTRUST:
 356                                 sp = KEY_ALLOCSP_DEFAULT();
 357                                 break;
 358
 359                         case IPSEC_POLICY_IPSEC:
 360                                 currsp->refcnt++;
 361                                 sp = currsp;
 362                                 break;
 363
 364                         default:
 365                                 ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
 366                                    "Invalid policy for PCB %d\n", currsp->policy));
 367                                 *error = EINVAL;
 368                                 return NULL;
 369                         }
 370                 }
 371         }
 372         KASSERT(sp != NULL,
 373                 ("ipsec_getpolicybysock: null SP (priv %u policy %u",
 374                  pcbsp->priv, currsp->policy));
 375         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 376                 printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates "
 377                        "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy,
 378                        sp, sp->refcnt));
 379         return sp;
 380 }
 381
 382 /*
 383  * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
 384  * and return a pointer to SP.
 385  * OUT: positive: a pointer to the entry for security policy leaf matched.
 386  *      NULL:   no apropreate SP found, the following value is set to error.
 387  *              0       : bypass
 388  *              EACCES  : discard packet.
 389  *              ENOENT  : ipsec_acquire() in progress, maybe.
 390  *              others  : error occured.
 391  */
 392 struct secpolicy *
 393 ipsec_getpolicybyaddr(struct mbuf *m, u_int dir, int flag, int *error)
 394 {
 395         struct secpolicyindex spidx;
 396         struct secpolicy *sp;
 397
 398         KASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf"));
 399         KASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error"));
 400         KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
 401                 ("ipsec4_getpolicybaddr: invalid direction %u", dir));
 402
 403         sp = NULL;
 404         if (key_havesp(dir)) {
 405                 /* Make an index to look for a policy. */
 406                 *error = ipsec_setspidx(m, &spidx,
 407                                         (flag & IP_FORWARDING) ? 0 : 1);
 408                 if (*error != 0) {
 409                         DPRINTF(("ipsec_getpolicybyaddr: setpidx failed,"
 410                                 " dir %u flag %u\n", dir, flag));
 411                         bzero(&spidx, sizeof (spidx));
 412                         return NULL;
 413                 }
 414                 spidx.dir = dir;
 415
 416                 sp = KEY_ALLOCSP(&spidx, dir);
 417         }
 418         if (sp == NULL)                 /* no SP found, use system default */
 419                 sp = KEY_ALLOCSP_DEFAULT();
 420         KASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP"));
 421         return sp;
 422 }
 423
 424 struct secpolicy *
 425 ipsec4_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error,
 426                    struct inpcb *inp)
 427 {
 428         struct secpolicy *sp;
 429
 430         *error = 0;
 431         if (inp == NULL)
 432                 sp = ipsec_getpolicybyaddr(m, dir, flag, error);
 433         else
 434                 sp = ipsec_getpolicybysock(m, dir, inp, error);
 435         if (sp == NULL) {
 436                 KASSERT(*error != 0,
 437                         ("ipsec4_checkpolicy: getpolicy failed w/o error"));
 438                 newipsecstat.ips_out_inval++;
 439                 return NULL;
 440         }
 441         KASSERT(*error == 0,
 442                 ("ipsec4_checkpolicy: sp w/ error set to %u", *error));
 443         switch (sp->policy) {
 444         case IPSEC_POLICY_ENTRUST:
 445         default:
 446                 printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy);
 447                 /* fall thru... */
 448         case IPSEC_POLICY_DISCARD:
 449                 newipsecstat.ips_out_polvio++;
 450                 *error = -EINVAL;       /* packet is discarded by caller */
 451                 break;
 452         case IPSEC_POLICY_BYPASS:
 453         case IPSEC_POLICY_NONE:
 454                 KEY_FREESP(&sp);
 455                 sp = NULL;              /* NB: force NULL result */
 456                 break;
 457         case IPSEC_POLICY_IPSEC:
 458                 if (sp->req == NULL)    /* acquire an SA */
 459                         *error = key_spdacquire(sp);
 460                 break;
 461         }
 462         if (*error != 0) {
 463                 KEY_FREESP(&sp);
 464                 sp = NULL;
 465         }
 466         return sp;
 467 }
 468
 469 static int
 470 ipsec4_setspidx_inpcb(struct mbuf *m, struct inpcb *pcb)
 471 {
 472         int error;
 473
 474         KASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb"));
 475         KASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp"));
 476         KASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
 477                 ("ipsec4_setspidx_inpcb: null sp_in || sp_out"));
 478
 479         error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
 480         if (error == 0) {
 481                 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
 482                 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
 483                 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
 484         } else {
 485                 bzero(&pcb->inp_sp->sp_in->spidx,
 486                         sizeof (pcb->inp_sp->sp_in->spidx));
 487                 bzero(&pcb->inp_sp->sp_out->spidx,
 488                         sizeof (pcb->inp_sp->sp_in->spidx));
 489         }
 490         return error;
 491 }
 492
 493 #ifdef INET6
 494 static int
 495 ipsec6_setspidx_in6pcb(struct mbuf *m, struct in6pcb *pcb)
 496 {
 497         struct secpolicyindex *spidx;
 498         int error;
 499
 500         KASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb"));
 501         KASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp"));
 502         KASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL,
 503                 ("ipsec6_setspidx_in6pcb: null sp_in || sp_out"));
 504
 505         bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
 506         bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
 507
 508         spidx = &pcb->in6p_sp->sp_in->spidx;
 509         error = ipsec_setspidx(m, spidx, 1);
 510         if (error)
 511                 goto bad;
 512         spidx->dir = IPSEC_DIR_INBOUND;
 513
 514         spidx = &pcb->in6p_sp->sp_out->spidx;
 515         error = ipsec_setspidx(m, spidx, 1);
 516         if (error)
 517                 goto bad;
 518         spidx->dir = IPSEC_DIR_OUTBOUND;
 519
 520         return 0;
 521
 522 bad:
 523         bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
 524         bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
 525         return error;
 526 }
 527 #endif
 528
 529 /*
 530  * configure security policy index (src/dst/proto/sport/dport)
 531  * by looking at the content of mbuf.
 532  * the caller is responsible for error recovery (like clearing up spidx).
 533  */
 534 static int
 535 ipsec_setspidx(struct mbuf *m, struct secpolicyindex *spidx, int needport)
 536 {
 537         struct ip *ip = NULL;
 538         struct ip ipbuf;
 539         u_int v;
 540         struct mbuf *n;
 541         int len;
 542         int error;
 543
 544         KASSERT(m != NULL, ("ipsec_setspidx: null mbuf"));
 545
 546         /*
 547          * validate m->m_pkthdr.len.  we see incorrect length if we
 548          * mistakenly call this function with inconsistent mbuf chain
 549          * (like 4.4BSD tcp/udp processing).  XXX should we panic here?
 550          */
 551         len = 0;
 552         for (n = m; n; n = n->m_next)
 553                 len += n->m_len;
 554         if (m->m_pkthdr.len != len) {
 555                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 556                         printf("ipsec_setspidx: "
 557                                "total of m_len(%d) != pkthdr.len(%d), "
 558                                "ignored.\n",
 559                                 len, m->m_pkthdr.len));
 560                 return EINVAL;
 561         }
 562
 563         if (m->m_pkthdr.len < sizeof(struct ip)) {
 564                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 565                         printf("ipsec_setspidx: "
 566                             "pkthdr.len(%d) < sizeof(struct ip), ignored.\n",
 567                             m->m_pkthdr.len));
 568                 return EINVAL;
 569         }
 570
 571         if (m->m_len >= sizeof(*ip))
 572                 ip = mtod(m, struct ip *);
 573         else {
 574                 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
 575                 ip = &ipbuf;
 576         }
 577 #ifdef _IP_VHL
 578         v = _IP_VHL_V(ip->ip_vhl);
 579 #else
 580         v = ip->ip_v;
 581 #endif
 582         switch (v) {
 583         case 4:
 584                 error = ipsec4_setspidx_ipaddr(m, spidx);
 585                 if (error)
 586                         return error;
 587                 ipsec4_get_ulp(m, spidx, needport);
 588                 return 0;
 589 #ifdef INET6
 590         case 6:
 591                 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
 592                         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 593                                 printf("ipsec_setspidx: "
 594                                     "pkthdr.len(%d) < sizeof(struct ip6_hdr), "
 595                                     "ignored.\n", m->m_pkthdr.len));
 596                         return EINVAL;
 597                 }
 598                 error = ipsec6_setspidx_ipaddr(m, spidx);
 599                 if (error)
 600                         return error;
 601                 ipsec6_get_ulp(m, spidx, needport);
 602                 return 0;
 603 #endif
 604         default:
 605                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 606                         printf("ipsec_setspidx: "
 607                             "unknown IP version %u, ignored.\n", v));
 608                 return EINVAL;
 609         }
 610 }
 611
 612 static void
 613 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
 614 {
 615         u_int8_t nxt;
 616         int off;
 617
 618         /* sanity check */
 619         KASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf"));
 620         KASSERT(m->m_pkthdr.len >= sizeof(struct ip),
 621                 ("ipsec4_get_ulp: packet too short"));
 622
 623         /* NB: ip_input() flips it into host endian XXX need more checking */
 624         if (m->m_len < sizeof (struct ip)) {
 625                 struct ip *ip = mtod(m, struct ip *);
 626                 if (ip->ip_off & (IP_MF | IP_OFFMASK))
 627                         goto done;
 628 #ifdef _IP_VHL
 629                 off = _IP_VHL_HL(ip->ip_vhl) << 2;
 630 #else
 631                 off = ip->ip_hl << 2;
 632 #endif
 633                 nxt = ip->ip_p;
 634         } else {
 635                 struct ip ih;
 636
 637                 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih);
 638                 if (ih.ip_off & (IP_MF | IP_OFFMASK))
 639                         goto done;
 640 #ifdef _IP_VHL
 641                 off = _IP_VHL_HL(ih.ip_vhl) << 2;
 642 #else
 643                 off = ih.ip_hl << 2;
 644 #endif
 645                 nxt = ih.ip_p;
 646         }
 647
 648         while (off < m->m_pkthdr.len) {
 649                 struct ip6_ext ip6e;
 650                 struct tcphdr th;
 651                 struct udphdr uh;
 652
 653                 switch (nxt) {
 654                 case IPPROTO_TCP:
 655                         spidx->ul_proto = nxt;
 656                         if (!needport)
 657                                 goto done_proto;
 658                         if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
 659                                 goto done;
 660                         m_copydata(m, off, sizeof (th), (caddr_t) &th);
 661                         spidx->src.sin.sin_port = th.th_sport;
 662                         spidx->dst.sin.sin_port = th.th_dport;
 663                         return;
 664                 case IPPROTO_UDP:
 665                         spidx->ul_proto = nxt;
 666                         if (!needport)
 667                                 goto done_proto;
 668                         if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
 669                                 goto done;
 670                         m_copydata(m, off, sizeof (uh), (caddr_t) &uh);
 671                         spidx->src.sin.sin_port = uh.uh_sport;
 672                         spidx->dst.sin.sin_port = uh.uh_dport;
 673                         return;
 674                 case IPPROTO_AH:
 675                         if (off + sizeof(ip6e) > m->m_pkthdr.len)
 676                                 goto done;
 677                         /* XXX sigh, this works but is totally bogus */
 678                         m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e);
 679                         off += (ip6e.ip6e_len + 2) << 2;
 680                         nxt = ip6e.ip6e_nxt;
 681                         break;
 682                 case IPPROTO_ICMP:
 683                 default:
 684                         /* XXX intermediate headers??? */
 685                         spidx->ul_proto = nxt;
 686                         goto done_proto;
 687                 }
 688         }
 689 done:
 690         spidx->ul_proto = IPSEC_ULPROTO_ANY;
 691 done_proto:
 692         spidx->src.sin.sin_port = IPSEC_PORT_ANY;
 693         spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
 694 }
 695
 696 /* assumes that m is sane */
 697 static int
 698 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
 699 {
 700         static const struct sockaddr_in template = {
 701                 sizeof (struct sockaddr_in),
 702                 AF_INET,
 703                 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
 704         };
 705
 706         spidx->src.sin = template;
 707         spidx->dst.sin = template;
 708
 709         if (m->m_len < sizeof (struct ip)) {
 710                 m_copydata(m, offsetof(struct ip, ip_src),
 711                            sizeof (struct  in_addr),
 712                            (caddr_t) &spidx->src.sin.sin_addr);
 713                 m_copydata(m, offsetof(struct ip, ip_dst),
 714                            sizeof (struct  in_addr),
 715                            (caddr_t) &spidx->dst.sin.sin_addr);
 716         } else {
 717                 struct ip *ip = mtod(m, struct ip *);
 718                 spidx->src.sin.sin_addr = ip->ip_src;
 719                 spidx->dst.sin.sin_addr = ip->ip_dst;
 720         }
 721
 722         spidx->prefs = sizeof(struct in_addr) << 3;
 723         spidx->prefd = sizeof(struct in_addr) << 3;
 724
 725         return 0;
 726 }
 727
 728 #ifdef INET6
 729 static void
 730 ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
 731 {
 732         int off, nxt;
 733         struct tcphdr th;
 734         struct udphdr uh;
 735
 736         /* sanity check */
 737         if (m == NULL)
 738                 panic("ipsec6_get_ulp: NULL pointer was passed.\n");
 739
 740         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 741                 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m));
 742
 743         /* set default */
 744         spidx->ul_proto = IPSEC_ULPROTO_ANY;
 745         ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
 746         ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
 747
 748         nxt = -1;
 749         off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
 750         if (off < 0 || m->m_pkthdr.len < off)
 751                 return;
 752
 753         switch (nxt) {
 754         case IPPROTO_TCP:
 755                 spidx->ul_proto = nxt;
 756                 if (!needport)
 757                         break;
 758                 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
 759                         break;
 760                 m_copydata(m, off, sizeof(th), (caddr_t)&th);
 761                 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
 762                 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
 763                 break;
 764         case IPPROTO_UDP:
 765                 spidx->ul_proto = nxt;
 766                 if (!needport)
 767                         break;
 768                 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
 769                         break;
 770                 m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
 771                 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
 772                 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
 773                 break;
 774         case IPPROTO_ICMPV6:
 775         default:
 776                 /* XXX intermediate headers??? */
 777                 spidx->ul_proto = nxt;
 778                 break;
 779         }
 780 }
 781
 782 /* assumes that m is sane */
 783 static int
 784 ipsec6_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
 785 {
 786         struct ip6_hdr *ip6 = NULL;
 787         struct ip6_hdr ip6buf;
 788         struct sockaddr_in6 *sin6;
 789
 790         if (m->m_len >= sizeof(*ip6))
 791                 ip6 = mtod(m, struct ip6_hdr *);
 792         else {
 793                 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
 794                 ip6 = &ip6buf;
 795         }
 796
 797         sin6 = (struct sockaddr_in6 *)&spidx->src;
 798         bzero(sin6, sizeof(*sin6));
 799         sin6->sin6_family = AF_INET6;
 800         sin6->sin6_len = sizeof(struct sockaddr_in6);
 801         bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
 802         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
 803                 sin6->sin6_addr.s6_addr16[1] = 0;
 804                 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
 805         }
 806         spidx->prefs = sizeof(struct in6_addr) << 3;
 807
 808         sin6 = (struct sockaddr_in6 *)&spidx->dst;
 809         bzero(sin6, sizeof(*sin6));
 810         sin6->sin6_family = AF_INET6;
 811         sin6->sin6_len = sizeof(struct sockaddr_in6);
 812         bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
 813         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
 814                 sin6->sin6_addr.s6_addr16[1] = 0;
 815                 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
 816         }
 817         spidx->prefd = sizeof(struct in6_addr) << 3;
 818
 819         return 0;
 820 }
 821 #endif
 822
 823 static void
 824 ipsec_delpcbpolicy(struct inpcbpolicy *p)
 825 {
 826         kfree(p, M_SECA);
 827 }
 828
 829 /* initialize policy in PCB */
 830 int
 831 ipsec_init_policy(struct socket *so, struct inpcbpolicy **pcb_sp)
 832 {
 833         struct inpcbpolicy *new;
 834
 835         /* sanity check. */
 836         if (so == NULL || pcb_sp == NULL)
 837                 panic("ipsec_init_policy: NULL pointer was passed.\n");
 838
 839         new = kmalloc(sizeof(struct inpcbpolicy),
 840                         M_SECA, M_INTWAIT | M_ZERO | M_NULLOK);
 841         if (new == NULL) {
 842                 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n"));
 843                 return ENOBUFS;
 844         }
 845
 846         if (so->so_cred != 0 && so->so_cred->cr_uid == 0)
 847                 new->priv = 1;
 848         else
 849                 new->priv = 0;
 850
 851         if ((new->sp_in = KEY_NEWSP()) == NULL) {
 852                 ipsec_delpcbpolicy(new);
 853                 return ENOBUFS;
 854         }
 855         new->sp_in->state = IPSEC_SPSTATE_ALIVE;
 856         new->sp_in->policy = IPSEC_POLICY_ENTRUST;
 857
 858         if ((new->sp_out = KEY_NEWSP()) == NULL) {
 859                 KEY_FREESP(&new->sp_in);
 860                 ipsec_delpcbpolicy(new);
 861                 return ENOBUFS;
 862         }
 863         new->sp_out->state = IPSEC_SPSTATE_ALIVE;
 864         new->sp_out->policy = IPSEC_POLICY_ENTRUST;
 865
 866         *pcb_sp = new;
 867
 868         return 0;
 869 }
 870
 871 /* copy old ipsec policy into new */
 872 int
 873 ipsec_copy_policy(struct inpcbpolicy *old, struct inpcbpolicy *new)
 874 {
 875         struct secpolicy *sp;
 876
 877         sp = ipsec_deepcopy_policy(old->sp_in);
 878         if (sp) {
 879                 KEY_FREESP(&new->sp_in);
 880                 new->sp_in = sp;
 881         } else
 882                 return ENOBUFS;
 883
 884         sp = ipsec_deepcopy_policy(old->sp_out);
 885         if (sp) {
 886                 KEY_FREESP(&new->sp_out);
 887                 new->sp_out = sp;
 888         } else
 889                 return ENOBUFS;
 890
 891         new->priv = old->priv;
 892
 893         return 0;
 894 }
 895
 896 /* deep-copy a policy in PCB */
 897 static struct secpolicy *
 898 ipsec_deepcopy_policy(struct secpolicy *src)
 899 {
 900         struct ipsecrequest *newchain = NULL;
 901         struct ipsecrequest *p;
 902         struct ipsecrequest **q;
 903         struct ipsecrequest *r;
 904         struct secpolicy *dst;
 905
 906         if (src == NULL)
 907                 return NULL;
 908         dst = KEY_NEWSP();
 909         if (dst == NULL)
 910                 return NULL;
 911
 912         /*
 913          * deep-copy IPsec request chain.  This is required since struct
 914          * ipsecrequest is not reference counted.
 915          */
 916         q = &newchain;
 917         for (p = src->req; p; p = p->next) {
 918                 *q = kmalloc(sizeof(struct ipsecrequest),
 919                         M_SECA, M_INTWAIT | M_ZERO | M_NULLOK);
 920                 if (*q == NULL)
 921                         goto fail;
 922                 (*q)->next = NULL;
 923
 924                 (*q)->saidx.proto = p->saidx.proto;
 925                 (*q)->saidx.mode = p->saidx.mode;
 926                 (*q)->level = p->level;
 927                 (*q)->saidx.reqid = p->saidx.reqid;
 928
 929                 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
 930                 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
 931
 932                 (*q)->sav = NULL;
 933                 (*q)->sp = dst;
 934
 935                 q = &((*q)->next);
 936         }
 937
 938         dst->req = newchain;
 939         dst->state = src->state;
 940         dst->policy = src->policy;
 941         /* do not touch the refcnt fields */
 942
 943         return dst;
 944
 945 fail:
 946         for (p = newchain; p; p = r) {
 947                 r = p->next;
 948                 kfree(p, M_SECA);
 949                 p = NULL;
 950         }
 951         return NULL;
 952 }
 953
 954 /* set policy and ipsec request if present. */
 955 static int
 956 ipsec_set_policy(struct secpolicy **pcb_sp, int optname, caddr_t request,
 957                  size_t len, int priv)
 958 {
 959         struct sadb_x_policy *xpl;
 960         struct secpolicy *newsp = NULL;
 961         int error;
 962
 963         /* sanity check. */
 964         if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
 965                 return EINVAL;
 966         if (len < sizeof(*xpl))
 967                 return EINVAL;
 968         xpl = (struct sadb_x_policy *)request;
 969
 970         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 971                 printf("ipsec_set_policy: passed policy\n");
 972                 kdebug_sadb_x_policy((struct sadb_ext *)xpl));
 973
 974         /* check policy type */
 975         /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
 976         if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
 977          || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
 978                 return EINVAL;
 979
 980         /* check privileged socket */
 981         if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS)
 982                 return EACCES;
 983
 984         /* allocation new SP entry */
 985         if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
 986                 return error;
 987
 988         newsp->state = IPSEC_SPSTATE_ALIVE;
 989
 990         /* clear old SP and set new SP */
 991         KEY_FREESP(pcb_sp);
 992         *pcb_sp = newsp;
 993         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 994                 printf("ipsec_set_policy: new policy\n");
 995                 kdebug_secpolicy(newsp));
 996
 997         return 0;
 998 }
 999
1000 static int
1001 ipsec_get_policy(struct secpolicy *pcb_sp, struct mbuf **mp)
1002 {
1003
1004         /* sanity check. */
1005         if (pcb_sp == NULL || mp == NULL)
1006                 return EINVAL;
1007
1008         *mp = key_sp2msg(pcb_sp);
1009         if (!*mp) {
1010                 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n"));
1011                 return ENOBUFS;
1012         }
1013
1014         KKASSERT((*mp)->m_type == MT_DATA);
1015         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1016                 printf("ipsec_get_policy:\n");
1017                 kdebug_mbuf(*mp));
1018
1019         return 0;
1020 }
1021
1022 int
1023 ipsec4_set_policy(struct inpcb *inp, int optname, caddr_t request,
1024                   size_t len, int priv)
1025 {
1026         struct sadb_x_policy *xpl;
1027         struct secpolicy **pcb_sp;
1028
1029         /* sanity check. */
1030         if (inp == NULL || request == NULL)
1031                 return EINVAL;
1032         if (len < sizeof(*xpl))
1033                 return EINVAL;
1034         xpl = (struct sadb_x_policy *)request;
1035
1036         /* select direction */
1037         switch (xpl->sadb_x_policy_dir) {
1038         case IPSEC_DIR_INBOUND:
1039                 pcb_sp = &inp->inp_sp->sp_in;
1040                 break;
1041         case IPSEC_DIR_OUTBOUND:
1042                 pcb_sp = &inp->inp_sp->sp_out;
1043                 break;
1044         default:
1045                 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
1046                         xpl->sadb_x_policy_dir));
1047                 return EINVAL;
1048         }
1049
1050         return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1051 }
1052
1053 int
1054 ipsec4_get_policy(struct inpcb *inp, caddr_t request, size_t len,
1055                   struct mbuf **mp)
1056 {
1057         struct sadb_x_policy *xpl;
1058         struct secpolicy *pcb_sp;
1059
1060         /* sanity check. */
1061         if (inp == NULL || request == NULL || mp == NULL)
1062                 return EINVAL;
1063         KASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp"));
1064         if (len < sizeof(*xpl))
1065                 return EINVAL;
1066         xpl = (struct sadb_x_policy *)request;
1067
1068         /* select direction */
1069         switch (xpl->sadb_x_policy_dir) {
1070         case IPSEC_DIR_INBOUND:
1071                 pcb_sp = inp->inp_sp->sp_in;
1072                 break;
1073         case IPSEC_DIR_OUTBOUND:
1074                 pcb_sp = inp->inp_sp->sp_out;
1075                 break;
1076         default:
1077                 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
1078                         xpl->sadb_x_policy_dir));
1079                 return EINVAL;
1080         }
1081
1082         return ipsec_get_policy(pcb_sp, mp);
1083 }
1084
1085 /* delete policy in PCB */
1086 int
1087 ipsec4_delete_pcbpolicy(struct inpcb *inp)
1088 {
1089         KASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp"));
1090
1091         if (inp->inp_sp == NULL)
1092                 return 0;
1093
1094         if (inp->inp_sp->sp_in != NULL)
1095                 KEY_FREESP(&inp->inp_sp->sp_in);
1096
1097         if (inp->inp_sp->sp_out != NULL)
1098                 KEY_FREESP(&inp->inp_sp->sp_out);
1099
1100         ipsec_delpcbpolicy(inp->inp_sp);
1101         inp->inp_sp = NULL;
1102
1103         return 0;
1104 }
1105
1106 #ifdef INET6
1107 int
1108 ipsec6_set_policy(struct in6pcb *in6p, int optname, caddr_t request,
1109                   size_t len, int priv)
1110 {
1111         struct sadb_x_policy *xpl;
1112         struct secpolicy **pcb_sp;
1113
1114         /* sanity check. */
1115         if (in6p == NULL || request == NULL)
1116                 return EINVAL;
1117         if (len < sizeof(*xpl))
1118                 return EINVAL;
1119         xpl = (struct sadb_x_policy *)request;
1120
1121         /* select direction */
1122         switch (xpl->sadb_x_policy_dir) {
1123         case IPSEC_DIR_INBOUND:
1124                 pcb_sp = &in6p->in6p_sp->sp_in;
1125                 break;
1126         case IPSEC_DIR_OUTBOUND:
1127                 pcb_sp = &in6p->in6p_sp->sp_out;
1128                 break;
1129         default:
1130                 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
1131                         xpl->sadb_x_policy_dir));
1132                 return EINVAL;
1133         }
1134
1135         return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1136 }
1137
1138 int
1139 ipsec6_get_policy(struct in6pcb *in6p, caddr_t request, size_t len,
1140                   struct mbuf **mp)
1141 {
1142         struct sadb_x_policy *xpl;
1143         struct secpolicy *pcb_sp;
1144
1145         /* sanity check. */
1146         if (in6p == NULL || request == NULL || mp == NULL)
1147                 return EINVAL;
1148         KASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp"));
1149         if (len < sizeof(*xpl))
1150                 return EINVAL;
1151         xpl = (struct sadb_x_policy *)request;
1152
1153         /* select direction */
1154         switch (xpl->sadb_x_policy_dir) {
1155         case IPSEC_DIR_INBOUND:
1156                 pcb_sp = in6p->in6p_sp->sp_in;
1157                 break;
1158         case IPSEC_DIR_OUTBOUND:
1159                 pcb_sp = in6p->in6p_sp->sp_out;
1160                 break;
1161         default:
1162                 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
1163                         xpl->sadb_x_policy_dir));
1164                 return EINVAL;
1165         }
1166
1167         return ipsec_get_policy(pcb_sp, mp);
1168 }
1169
1170 int
1171 ipsec6_delete_pcbpolicy(struct in6pcb *in6p)
1172 {
1173         KASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p"));
1174
1175         if (in6p->in6p_sp == NULL)
1176                 return 0;
1177
1178         if (in6p->in6p_sp->sp_in != NULL)
1179                 KEY_FREESP(&in6p->in6p_sp->sp_in);
1180
1181         if (in6p->in6p_sp->sp_out != NULL)
1182                 KEY_FREESP(&in6p->in6p_sp->sp_out);
1183
1184         ipsec_delpcbpolicy(in6p->in6p_sp);
1185         in6p->in6p_sp = NULL;
1186
1187         return 0;
1188 }
1189 #endif
1190
1191 /*
1192  * return current level.
1193  * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
1194  */
1195 u_int
1196 ipsec_get_reqlevel(struct ipsecrequest *isr)
1197 {
1198         u_int level = 0;
1199         u_int esp_trans_deflev, esp_net_deflev;
1200         u_int ah_trans_deflev, ah_net_deflev;
1201
1202         KASSERT(isr != NULL && isr->sp != NULL,
1203                 ("ipsec_get_reqlevel: null argument"));
1204         KASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
1205                 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u",
1206                  isr->sp->spidx.src.sa.sa_family,
1207                  isr->sp->spidx.dst.sa.sa_family));
1208
1209 /* XXX note that we have ipseclog() expanded here - code sync issue */
1210 #define IPSEC_CHECK_DEFAULT(lev) \
1211         (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE            \
1212                         && (lev) != IPSEC_LEVEL_UNIQUE)                       \
1213                 ? (ipsec_debug                                                \
1214                         ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
1215                                 (lev), IPSEC_LEVEL_REQUIRE)                   \
1216                         : 0),                                                 \
1217                         (lev) = IPSEC_LEVEL_REQUIRE,                          \
1218                         (lev)                                                 \
1219                 : (lev))
1220
1221         /* set default level */
1222         switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
1223 #ifdef INET
1224         case AF_INET:
1225                 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
1226                 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
1227                 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
1228                 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
1229                 break;
1230 #endif
1231 #ifdef INET6
1232         case AF_INET6:
1233                 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
1234                 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
1235                 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
1236                 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
1237                 break;
1238 #endif /* INET6 */
1239         default:
1240                 panic("key_get_reqlevel: unknown af %u",
1241                         isr->sp->spidx.src.sa.sa_family);
1242         }
1243
1244 #undef IPSEC_CHECK_DEFAULT
1245
1246         /* set level */
1247         switch (isr->level) {
1248         case IPSEC_LEVEL_DEFAULT:
1249                 switch (isr->saidx.proto) {
1250                 case IPPROTO_ESP:
1251                         if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1252                                 level = esp_net_deflev;
1253                         else
1254                                 level = esp_trans_deflev;
1255                         break;
1256                 case IPPROTO_AH:
1257                         if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1258                                 level = ah_net_deflev;
1259                         else
1260                                 level = ah_trans_deflev;
1261                         break;
1262                 case IPPROTO_IPCOMP:
1263                         /*
1264                          * we don't really care, as IPcomp document says that
1265                          * we shouldn't compress small packets
1266                          */
1267                         level = IPSEC_LEVEL_USE;
1268                         break;
1269                 default:
1270                         panic("ipsec_get_reqlevel: "
1271                                 "Illegal protocol defined %u\n",
1272                                 isr->saidx.proto);
1273                 }
1274                 break;
1275
1276         case IPSEC_LEVEL_USE:
1277         case IPSEC_LEVEL_REQUIRE:
1278                 level = isr->level;
1279                 break;
1280         case IPSEC_LEVEL_UNIQUE:
1281                 level = IPSEC_LEVEL_REQUIRE;
1282                 break;
1283
1284         default:
1285                 panic("ipsec_get_reqlevel: Illegal IPsec level %u\n",
1286                         isr->level);
1287         }
1288
1289         return level;
1290 }
1291
1292 /*
1293  * Check security policy requirements against the actual
1294  * packet contents.  Return one if the packet should be
1295  * reject as "invalid"; otherwiser return zero to have the
1296  * packet treated as "valid".
1297  *
1298  * OUT:
1299  *      0: valid
1300  *      1: invalid
1301  */
1302 int
1303 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
1304 {
1305         struct ipsecrequest *isr;
1306         int need_auth;
1307
1308         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1309                 printf("ipsec_in_reject: using SP\n");
1310                 kdebug_secpolicy(sp));
1311
1312         /* check policy */
1313         switch (sp->policy) {
1314         case IPSEC_POLICY_DISCARD:
1315                 return 1;
1316         case IPSEC_POLICY_BYPASS:
1317         case IPSEC_POLICY_NONE:
1318                 return 0;
1319         }
1320
1321         KASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1322                 ("ipsec_in_reject: invalid policy %u", sp->policy));
1323
1324         /* XXX should compare policy against ipsec header history */
1325
1326         need_auth = 0;
1327         for (isr = sp->req; isr != NULL; isr = isr->next) {
1328                 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
1329                         continue;
1330                 switch (isr->saidx.proto) {
1331                 case IPPROTO_ESP:
1332                         if ((m->m_flags & M_DECRYPTED) == 0) {
1333                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1334                                     printf("ipsec_in_reject: ESP m_flags:%x\n",
1335                                             m->m_flags));
1336                                 return 1;
1337                         }
1338
1339                         if (!need_auth &&
1340                             isr->sav != NULL &&
1341                             isr->sav->tdb_authalgxform != NULL &&
1342                             (m->m_flags & M_AUTHIPDGM) == 0) {
1343                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1344                                     printf("ipsec_in_reject: ESP/AH m_flags:%x\n",
1345                                             m->m_flags));
1346                                 return 1;
1347                         }
1348                         break;
1349                 case IPPROTO_AH:
1350                         need_auth = 1;
1351                         if ((m->m_flags & M_AUTHIPHDR) == 0) {
1352                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1353                                     printf("ipsec_in_reject: AH m_flags:%x\n",
1354                                             m->m_flags));
1355                                 return 1;
1356                         }
1357                         break;
1358                 case IPPROTO_IPCOMP:
1359                         /*
1360                          * we don't really care, as IPcomp document
1361                          * says that we shouldn't compress small
1362                          * packets, IPComp policy should always be
1363                          * treated as being in "use" level.
1364                          */
1365                         break;
1366                 }
1367         }
1368         return 0;               /* valid */
1369 }
1370
1371 /*
1372  * Check AH/ESP integrity.
1373  * This function is called from tcp_input(), udp_input(),
1374  * and {ah,esp}4_input for tunnel mode
1375  */
1376 int
1377 ipsec4_in_reject(struct mbuf *m, struct inpcb *inp)
1378 {
1379         struct secpolicy *sp;
1380         int error;
1381         int result;
1382
1383         KASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf"));
1384
1385         /* get SP for this packet.
1386          * When we are called from ip_forward(), we call
1387          * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1388          */
1389         if (inp == NULL)
1390                 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1391         else
1392                 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1393
1394         if (sp != NULL) {
1395                 result = ipsec_in_reject(sp, m);
1396                 if (result)
1397                         newipsecstat.ips_in_polvio++;
1398                 KEY_FREESP(&sp);
1399         } else {
1400                 result = 0;     /* XXX should be panic ?
1401                                  * -> No, there may be error. */
1402         }
1403         return result;
1404 }
1405
1406 #ifdef INET6
1407 /*
1408  * Check AH/ESP integrity.
1409  * This function is called from tcp6_input(), udp6_input(),
1410  * and {ah,esp}6_input for tunnel mode
1411  */
1412 int
1413 ipsec6_in_reject(struct mbuf *m, struct inpcb *inp)
1414 {
1415         struct secpolicy *sp = NULL;
1416         int error;
1417         int result;
1418
1419         /* sanity check */
1420         if (m == NULL)
1421                 return 0;       /* XXX should be panic ? */
1422
1423         /* get SP for this packet.
1424          * When we are called from ip_forward(), we call
1425          * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1426          */
1427         if (inp == NULL)
1428                 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1429         else
1430                 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1431
1432         if (sp != NULL) {
1433                 result = ipsec_in_reject(sp, m);
1434                 if (result)
1435                         newipsecstat.ips_in_polvio++;
1436                 KEY_FREESP(&sp);
1437         } else {
1438                 result = 0;
1439         }
1440         return result;
1441 }
1442 #endif
1443
1444 /*
1445  * compute the byte size to be occupied by IPsec header.
1446  * in case it is tunneled, it includes the size of outer IP header.
1447  * NOTE: SP passed is free in this function.
1448  */
1449 static size_t
1450 ipsec_hdrsiz(struct secpolicy *sp)
1451 {
1452         struct ipsecrequest *isr;
1453         size_t siz;
1454
1455         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1456                 printf("ipsec_hdrsiz: using SP\n");
1457                 kdebug_secpolicy(sp));
1458
1459         switch (sp->policy) {
1460         case IPSEC_POLICY_DISCARD:
1461         case IPSEC_POLICY_BYPASS:
1462         case IPSEC_POLICY_NONE:
1463                 return 0;
1464         }
1465
1466         KASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1467                 ("ipsec_hdrsiz: invalid policy %u", sp->policy));
1468
1469         siz = 0;
1470         for (isr = sp->req; isr != NULL; isr = isr->next) {
1471                 size_t clen = 0;
1472
1473                 switch (isr->saidx.proto) {
1474                 case IPPROTO_ESP:
1475                         clen = esp_hdrsiz(isr->sav);
1476                         break;
1477                 case IPPROTO_AH:
1478                         clen = ah_hdrsiz(isr->sav);
1479                         break;
1480                 case IPPROTO_IPCOMP:
1481                         clen = sizeof(struct ipcomp);
1482                         break;
1483                 }
1484
1485                 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
1486                         switch (isr->saidx.dst.sa.sa_family) {
1487                         case AF_INET:
1488                                 clen += sizeof(struct ip);
1489                                 break;
1490 #ifdef INET6
1491                         case AF_INET6:
1492                                 clen += sizeof(struct ip6_hdr);
1493                                 break;
1494 #endif
1495                         default:
1496                                 ipseclog((LOG_ERR, "ipsec_hdrsiz: "
1497                                     "unknown AF %d in IPsec tunnel SA\n",
1498                                     ((struct sockaddr *)&isr->saidx.dst)->sa_family));
1499                                 break;
1500                         }
1501                 }
1502                 siz += clen;
1503         }
1504
1505         return siz;
1506 }
1507
1508 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
1509 size_t
1510 ipsec4_hdrsiz(struct mbuf *m, u_int dir, struct inpcb *inp)
1511 {
1512         struct secpolicy *sp;
1513         int error;
1514         size_t size;
1515
1516         KASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf"));
1517         KASSERT(inp == NULL || inp->inp_socket != NULL,
1518                 ("ipsec4_hdrsize: socket w/o inpcb"));
1519
1520         /* get SP for this packet.
1521          * When we are called from ip_forward(), we call
1522          * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1523          */
1524         if (inp == NULL)
1525                 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1526         else
1527                 sp = ipsec_getpolicybysock(m, dir, inp, &error);
1528
1529         if (sp != NULL) {
1530                 size = ipsec_hdrsiz(sp);
1531                 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1532                         printf("ipsec4_hdrsiz: size:%lu.\n",
1533                                 (unsigned long)size));
1534
1535                 KEY_FREESP(&sp);
1536         } else {
1537                 size = 0;       /* XXX should be panic ? */
1538         }
1539         return size;
1540 }
1541
1542 #ifdef INET6
1543 /* This function is called from ipsec6_hdrsize_tcp(),
1544  * and maybe from ip6_forward.()
1545  */
1546 size_t
1547 ipsec6_hdrsiz(struct mbuf *m, u_int dir, struct in6pcb *in6p)
1548 {
1549         struct secpolicy *sp;
1550         int error;
1551         size_t size;
1552
1553         KASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf"));
1554         KASSERT(in6p == NULL || in6p->in6p_socket != NULL,
1555                 ("ipsec6_hdrsize: socket w/o inpcb"));
1556
1557         /* get SP for this packet */
1558         /* XXX Is it right to call with IP_FORWARDING. */
1559         if (in6p == NULL)
1560                 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1561         else
1562                 sp = ipsec_getpolicybysock(m, dir, in6p, &error);
1563
1564         if (sp == NULL)
1565                 return 0;
1566         size = ipsec_hdrsiz(sp);
1567         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1568                 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size));
1569         KEY_FREESP(&sp);
1570
1571         return size;
1572 }
1573 #endif /*INET6*/
1574
1575 /*
1576  * Check the variable replay window.
1577  * ipsec_chkreplay() performs replay check before ICV verification.
1578  * ipsec_updatereplay() updates replay bitmap.  This must be called after
1579  * ICV verification (it also performs replay check, which is usually done
1580  * beforehand).
1581  * 0 (zero) is returned if packet disallowed, 1 if packet permitted.
1582  *
1583  * based on RFC 2401.
1584  */
1585 int
1586 ipsec_chkreplay(u_int32_t seq, struct secasvar *sav)
1587 {
1588         const struct secreplay *replay;
1589         u_int32_t diff;
1590         int fr;
1591         u_int32_t wsizeb;       /* constant: bits of window size */
1592         int frlast;             /* constant: last frame */
1593
1594         KASSERT(sav != NULL, ("ipsec_chkreplay: Null SA"));
1595         KASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state"));
1596
1597         replay = sav->replay;
1598
1599         if (replay->wsize == 0)
1600                 return 1;       /* no need to check replay. */
1601
1602         /* constant */
1603         frlast = replay->wsize - 1;
1604         wsizeb = replay->wsize << 3;
1605
1606         /* sequence number of 0 is invalid */
1607         if (seq == 0)
1608                 return 0;
1609
1610         /* first time is always okay */
1611         if (replay->count == 0)
1612                 return 1;
1613
1614         if (seq > replay->lastseq) {
1615                 /* larger sequences are okay */
1616                 return 1;
1617         } else {
1618                 /* seq is equal or less than lastseq. */
1619                 diff = replay->lastseq - seq;
1620
1621                 /* over range to check, i.e. too old or wrapped */
1622                 if (diff >= wsizeb)
1623                         return 0;
1624
1625                 fr = frlast - diff / 8;
1626
1627                 /* this packet already seen ? */
1628                 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1629                         return 0;
1630
1631                 /* out of order but good */
1632                 return 1;
1633         }
1634 }
1635
1636 /*
1637  * check replay counter whether to update or not.
1638  * OUT: 0:      OK
1639  *      1:      NG
1640  */
1641 int
1642 ipsec_updatereplay(u_int32_t seq, struct secasvar *sav)
1643 {
1644         struct secreplay *replay;
1645         u_int32_t diff;
1646         int fr;
1647         u_int32_t wsizeb;       /* constant: bits of window size */
1648         int frlast;             /* constant: last frame */
1649
1650         KASSERT(sav != NULL, ("ipsec_updatereplay: Null SA"));
1651         KASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state"));
1652
1653         replay = sav->replay;
1654
1655         if (replay->wsize == 0)
1656                 goto ok;        /* no need to check replay. */
1657
1658         /* constant */
1659         frlast = replay->wsize - 1;
1660         wsizeb = replay->wsize << 3;
1661
1662         /* sequence number of 0 is invalid */
1663         if (seq == 0)
1664                 return 1;
1665
1666         /* first time */
1667         if (replay->count == 0) {
1668                 replay->lastseq = seq;
1669                 bzero(replay->bitmap, replay->wsize);
1670                 (replay->bitmap)[frlast] = 1;
1671                 goto ok;
1672         }
1673
1674         if (seq > replay->lastseq) {
1675                 /* seq is larger than lastseq. */
1676                 diff = seq - replay->lastseq;
1677
1678                 /* new larger sequence number */
1679                 if (diff < wsizeb) {
1680                         /* In window */
1681                         /* set bit for this packet */
1682                         vshiftl(replay->bitmap, diff, replay->wsize);
1683                         (replay->bitmap)[frlast] |= 1;
1684                 } else {
1685                         /* this packet has a "way larger" */
1686                         bzero(replay->bitmap, replay->wsize);
1687                         (replay->bitmap)[frlast] = 1;
1688                 }
1689                 replay->lastseq = seq;
1690
1691                 /* larger is good */
1692         } else {
1693                 /* seq is equal or less than lastseq. */
1694                 diff = replay->lastseq - seq;
1695
1696                 /* over range to check, i.e. too old or wrapped */
1697                 if (diff >= wsizeb)
1698                         return 1;
1699
1700                 fr = frlast - diff / 8;
1701
1702                 /* this packet already seen ? */
1703                 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1704                         return 1;
1705
1706                 /* mark as seen */
1707                 (replay->bitmap)[fr] |= (1 << (diff % 8));
1708
1709                 /* out of order but good */
1710         }
1711
1712 ok:
1713         if (replay->count == ~0) {
1714
1715                 /* set overflow flag */
1716                 replay->overflow++;
1717
1718                 /* don't increment, no more packets accepted */
1719                 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
1720                         return 1;
1721
1722                 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n",
1723                     replay->overflow, ipsec_logsastr(sav)));
1724         }
1725
1726         replay->count++;
1727
1728         return 0;
1729 }
1730
1731 /*
1732  * shift variable length buffer to left.
1733  * IN:  bitmap: pointer to the buffer
1734  *      nbit:   the number of to shift.
1735  *      wsize:  buffer size (bytes).
1736  */
1737 static void
1738 vshiftl(unsigned char *bitmap, int nbit, int wsize)
1739 {
1740         int s, j, i;
1741         unsigned char over;
1742
1743         for (j = 0; j < nbit; j += 8) {
1744                 s = (nbit - j < 8) ? (nbit - j): 8;
1745                 bitmap[0] <<= s;
1746                 for (i = 1; i < wsize; i++) {
1747                         over = (bitmap[i] >> (8 - s));
1748                         bitmap[i] <<= s;
1749                         bitmap[i-1] |= over;
1750                 }
1751         }
1752
1753         return;
1754 }
1755
1756 /* Return a printable string for the address. */
1757 char *
1758 ipsec_address(union sockaddr_union* sa)
1759 {
1760         switch (sa->sa.sa_family) {
1761 #if INET
1762         case AF_INET:
1763                 return inet_ntoa(sa->sin.sin_addr);
1764 #endif /* INET */
1765
1766 #if INET6
1767         case AF_INET6:
1768                 return ip6_sprintf(&sa->sin6.sin6_addr);
1769 #endif /* INET6 */
1770
1771         default:
1772                 return "(unknown address family)";
1773         }
1774 }
1775
1776 const char *
1777 ipsec_logsastr(struct secasvar *sav)
1778 {
1779         static char buf[256];
1780         char *p;
1781         struct secasindex *saidx = &sav->sah->saidx;
1782
1783         KASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
1784                 ("ipsec_logsastr: address family mismatch"));
1785
1786         p = buf;
1787         ksnprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
1788         while (p && *p)
1789                 p++;
1790         /* NB: only use ipsec_address on one address at a time */
1791         ksnprintf(p, sizeof (buf) - (p - buf), "src=%s ",
1792                 ipsec_address(&saidx->src));
1793         while (p && *p)
1794                 p++;
1795         ksnprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
1796                 ipsec_address(&saidx->dst));
1797
1798         return buf;
1799 }
1800
1801 void
1802 ipsec_dumpmbuf(struct mbuf *m)
1803 {
1804         int totlen;
1805         int i;
1806         u_char *p;
1807
1808         totlen = 0;
1809         printf("---\n");
1810         while (m) {
1811                 p = mtod(m, u_char *);
1812                 for (i = 0; i < m->m_len; i++) {
1813                         printf("%02x ", p[i]);
1814                         totlen++;
1815                         if (totlen % 16 == 0)
1816                                 printf("\n");
1817                 }
1818                 m = m->m_next;
1819         }
1820         if (totlen % 16 != 0)
1821                 printf("\n");
1822         printf("---\n");
1823 }
1824
1825 /* XXX this stuff doesn't belong here... */
1826
1827 static  struct xformsw* xforms = NULL;
1828
1829 /*
1830  * Register a transform; typically at system startup.
1831  */
1832 void
1833 xform_register(struct xformsw* xsp)
1834 {
1835         xsp->xf_next = xforms;
1836         xforms = xsp;
1837 }
1838
1839 /*
1840  * Initialize transform support in an sav.
1841  */
1842 int
1843 xform_init(struct secasvar *sav, int xftype)
1844 {
1845         struct xformsw *xsp;
1846
1847         if (sav->tdb_xform != NULL)     /* previously initialized */
1848                 return 0;
1849         for (xsp = xforms; xsp; xsp = xsp->xf_next)
1850                 if (xsp->xf_type == xftype)
1851                         return (*xsp->xf_init)(sav, xsp);
1852         return EINVAL;
1853 }