setkey.tproj/pfkey.c

   1 /*      $FreeBSD: src/lib/libipsec/pfkey.c,v 1.1.2.2 2001/07/03 11:01:14 ume Exp $      */
   2 /*      $KAME: pfkey.c,v 1.39 2001/03/05 18:22:17 thorpej Exp $ */
   3
   4 /*
   5  * Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <sys/types.h>
  34 #include <sys/param.h>
  35 #include <sys/socket.h>
  36 #include <net/pfkeyv2.h>
  37 #include <netkey/key_var.h>
  38 #include <netinet/in.h>
  39 #include <netinet6/ipsec.h>
  40
  41 #include <stdlib.h>
  42 #include <unistd.h>
  43 #include <string.h>
  44 #include <errno.h>
  45 #include <stdio.h>
  46
  47 #include "ipsec_strerror.h"
  48 #include "libpfkey.h"
  49
  50 #define CALLOC(size, cast) (cast)calloc(1, (size))
  51
  52 static int findsupportedmap __P((int));
  53 static int setsupportedmap __P((struct sadb_supported *));
  54 static struct sadb_alg *findsupportedalg __P((u_int, u_int));
  55 static int pfkey_send_x1 __P((int, u_int, u_int, u_int, struct sockaddr *,
  56         struct sockaddr *, u_int32_t, u_int32_t, u_int, caddr_t,
  57         u_int, u_int, u_int, u_int, u_int, u_int32_t, u_int32_t,
  58         u_int32_t, u_int32_t, u_int32_t));
  59 static int pfkey_send_x2 __P((int, u_int, u_int, u_int,
  60         struct sockaddr *, struct sockaddr *, u_int32_t));
  61 static int pfkey_send_x3 __P((int, u_int, u_int));
  62 static int pfkey_send_x4 __P((int, u_int, struct sockaddr *, u_int,
  63         struct sockaddr *, u_int, u_int, u_int64_t, u_int64_t,
  64         char *, int, u_int32_t));
  65 static int pfkey_send_x5 __P((int, u_int, u_int32_t));
  66
  67 static caddr_t pfkey_setsadbmsg __P((caddr_t, caddr_t, u_int, u_int,
  68         u_int, u_int32_t, pid_t));
  69 static caddr_t pfkey_setsadbsa __P((caddr_t, caddr_t, u_int32_t, u_int,
  70         u_int, u_int, u_int32_t));
  71 static caddr_t pfkey_setsadbaddr __P((caddr_t, caddr_t, u_int,
  72         struct sockaddr *, u_int, u_int));
  73 static caddr_t pfkey_setsadbkey __P((caddr_t, caddr_t, u_int, caddr_t, u_int));
  74 static caddr_t pfkey_setsadblifetime __P((caddr_t, caddr_t, u_int, u_int32_t,
  75         u_int32_t, u_int32_t, u_int32_t));
  76 static caddr_t pfkey_setsadbxsa2 __P((caddr_t, caddr_t, u_int32_t, u_int32_t));
  77
  78 /*
  79  * make and search supported algorithm structure.
  80  */
  81 static struct sadb_supported *ipsec_supported[] = { NULL, NULL, NULL, };
  82
  83 static int supported_map[] = {
  84         SADB_SATYPE_AH,
  85         SADB_SATYPE_ESP,
  86         SADB_X_SATYPE_IPCOMP,
  87 };
  88
  89 static int
  90 findsupportedmap(satype)
  91         int satype;
  92 {
  93         int i;
  94
  95         for (i = 0; i < sizeof(supported_map)/sizeof(supported_map[0]); i++)
  96                 if (supported_map[i] == satype)
  97                         return i;
  98         return -1;
  99 }
 100
 101 static struct sadb_alg *
 102 findsupportedalg(satype, alg_id)
 103         u_int satype, alg_id;
 104 {
 105         int algno;
 106         int tlen;
 107         caddr_t p;
 108
 109         /* validity check */
 110         algno = findsupportedmap(satype);
 111         if (algno == -1) {
 112                 __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
 113                 return NULL;
 114         }
 115         if (ipsec_supported[algno] == NULL) {
 116                 __ipsec_errcode = EIPSEC_DO_GET_SUPP_LIST;
 117                 return NULL;
 118         }
 119
 120         tlen = ipsec_supported[algno]->sadb_supported_len
 121                 - sizeof(struct sadb_supported);
 122         p = (caddr_t)(ipsec_supported[algno] + 1);
 123         while (tlen > 0) {
 124                 if (tlen < sizeof(struct sadb_alg)) {
 125                         /* invalid format */
 126                         break;
 127                 }
 128                 if (((struct sadb_alg *)p)->sadb_alg_id == alg_id)
 129                         return (struct sadb_alg *)p;
 130
 131                 tlen -= sizeof(struct sadb_alg);
 132                 p += sizeof(struct sadb_alg);
 133         }
 134
 135         __ipsec_errcode = EIPSEC_NOT_SUPPORTED;
 136         return NULL;
 137 }
 138
 139 static int
 140 setsupportedmap(sup)
 141         struct sadb_supported *sup;
 142 {
 143         struct sadb_supported **ipsup;
 144
 145         switch (sup->sadb_supported_exttype) {
 146         case SADB_EXT_SUPPORTED_AUTH:
 147                 ipsup = &ipsec_supported[findsupportedmap(SADB_SATYPE_AH)];
 148                 break;
 149         case SADB_EXT_SUPPORTED_ENCRYPT:
 150                 ipsup = &ipsec_supported[findsupportedmap(SADB_SATYPE_ESP)];
 151                 break;
 152         default:
 153                 __ipsec_errcode = EIPSEC_INVAL_SATYPE;
 154                 return -1;
 155         }
 156
 157         if (*ipsup)
 158                 free(*ipsup);
 159
 160         *ipsup = malloc(sup->sadb_supported_len);
 161         if (!*ipsup) {
 162                 __ipsec_set_strerror(strerror(errno));
 163                 return -1;
 164         }
 165         memcpy(*ipsup, sup, sup->sadb_supported_len);
 166
 167         return 0;
 168 }
 169
 170 /*
 171  * check key length against algorithm specified.
 172  * This function is called with SADB_EXT_SUPPORTED_{AUTH,ENCRYPT} as the
 173  * augument, and only calls to ipsec_check_keylen2();
 174  * keylen is the unit of bit.
 175  * OUT:
 176  *      -1: invalid.
 177  *       0: valid.
 178  */
 179 int
 180 ipsec_check_keylen(supported, alg_id, keylen)
 181         u_int supported;
 182         u_int alg_id;
 183         u_int keylen;
 184 {
 185         int satype;
 186
 187         /* validity check */
 188         switch (supported) {
 189         case SADB_EXT_SUPPORTED_AUTH:
 190                 satype = SADB_SATYPE_AH;
 191                 break;
 192         case SADB_EXT_SUPPORTED_ENCRYPT:
 193                 satype = SADB_SATYPE_ESP;
 194                 break;
 195         default:
 196                 __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
 197                 return -1;
 198         }
 199
 200         return ipsec_check_keylen2(satype, alg_id, keylen);
 201 }
 202
 203 /*
 204  * check key length against algorithm specified.
 205  * satype is one of satype defined at pfkeyv2.h.
 206  * keylen is the unit of bit.
 207  * OUT:
 208  *      -1: invalid.
 209  *       0: valid.
 210  */
 211 int
 212 ipsec_check_keylen2(satype, alg_id, keylen)
 213         u_int satype;
 214         u_int alg_id;
 215         u_int keylen;
 216 {
 217         struct sadb_alg *alg;
 218
 219         alg = findsupportedalg(satype, alg_id);
 220         if (!alg)
 221                 return -1;
 222
 223         if (keylen < alg->sadb_alg_minbits || keylen > alg->sadb_alg_maxbits) {
 224                 __ipsec_errcode = EIPSEC_INVAL_KEYLEN;
 225                 return -1;
 226         }
 227
 228         __ipsec_errcode = EIPSEC_NO_ERROR;
 229         return 0;
 230 }
 231
 232 /*
 233  * get max/min key length against algorithm specified.
 234  * satype is one of satype defined at pfkeyv2.h.
 235  * keylen is the unit of bit.
 236  * OUT:
 237  *      -1: invalid.
 238  *       0: valid.
 239  */
 240 int
 241 ipsec_get_keylen(supported, alg_id, alg0)
 242         u_int supported, alg_id;
 243         struct sadb_alg *alg0;
 244 {
 245         struct sadb_alg *alg;
 246         u_int satype;
 247
 248         /* validity check */
 249         if (!alg0) {
 250                 __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
 251                 return -1;
 252         }
 253
 254         switch (supported) {
 255         case SADB_EXT_SUPPORTED_AUTH:
 256                 satype = SADB_SATYPE_AH;
 257                 break;
 258         case SADB_EXT_SUPPORTED_ENCRYPT:
 259                 satype = SADB_SATYPE_ESP;
 260                 break;
 261         default:
 262                 __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
 263                 return -1;
 264         }
 265
 266         alg = findsupportedalg(satype, alg_id);
 267         if (!alg)
 268                 return -1;
 269
 270         memcpy(alg0, alg, sizeof(*alg0));
 271
 272         __ipsec_errcode = EIPSEC_NO_ERROR;
 273         return 0;
 274 }
 275
 276 /*
 277  * set the rate for SOFT lifetime against HARD one.
 278  * If rate is more than 100 or equal to zero, then set to 100.
 279  */
 280 static u_int soft_lifetime_allocations_rate = PFKEY_SOFT_LIFETIME_RATE;
 281 static u_int soft_lifetime_bytes_rate = PFKEY_SOFT_LIFETIME_RATE;
 282 static u_int soft_lifetime_addtime_rate = PFKEY_SOFT_LIFETIME_RATE;
 283 static u_int soft_lifetime_usetime_rate = PFKEY_SOFT_LIFETIME_RATE;
 284
 285 u_int
 286 pfkey_set_softrate(type, rate)
 287         u_int type, rate;
 288 {
 289         __ipsec_errcode = EIPSEC_NO_ERROR;
 290
 291         if (rate > 100 || rate == 0)
 292                 rate = 100;
 293
 294         switch (type) {
 295         case SADB_X_LIFETIME_ALLOCATIONS:
 296                 soft_lifetime_allocations_rate = rate;
 297                 return 0;
 298         case SADB_X_LIFETIME_BYTES:
 299                 soft_lifetime_bytes_rate = rate;
 300                 return 0;
 301         case SADB_X_LIFETIME_ADDTIME:
 302                 soft_lifetime_addtime_rate = rate;
 303                 return 0;
 304         case SADB_X_LIFETIME_USETIME:
 305                 soft_lifetime_usetime_rate = rate;
 306                 return 0;
 307         }
 308
 309         __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
 310         return 1;
 311 }
 312
 313 /*
 314  * get current rate for SOFT lifetime against HARD one.
 315  * ATTENTION: ~0 is returned if invalid type was passed.
 316  */
 317 u_int
 318 pfkey_get_softrate(type)
 319         u_int type;
 320 {
 321         switch (type) {
 322         case SADB_X_LIFETIME_ALLOCATIONS:
 323                 return soft_lifetime_allocations_rate;
 324         case SADB_X_LIFETIME_BYTES:
 325                 return soft_lifetime_bytes_rate;
 326         case SADB_X_LIFETIME_ADDTIME:
 327                 return soft_lifetime_addtime_rate;
 328         case SADB_X_LIFETIME_USETIME:
 329                 return soft_lifetime_usetime_rate;
 330         }
 331
 332         return ~0;
 333 }
 334
 335 /*
 336  * sending SADB_GETSPI message to the kernel.
 337  * OUT:
 338  *      positive: success and return length sent.
 339  *      -1      : error occured, and set errno.
 340  */
 341 int
 342 pfkey_send_getspi(so, satype, mode, src, dst, min, max, reqid, seq)
 343         int so;
 344         u_int satype, mode;
 345         struct sockaddr *src, *dst;
 346         u_int32_t min, max, reqid, seq;
 347 {
 348         struct sadb_msg *newmsg;
 349         caddr_t ep;
 350         int len;
 351         int need_spirange = 0;
 352         caddr_t p;
 353         int plen;
 354
 355         /* validity check */
 356         if (src == NULL || dst == NULL) {
 357                 __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
 358                 return -1;
 359         }
 360         if (src->sa_family != dst->sa_family) {
 361                 __ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
 362                 return -1;
 363         }
 364         if (min > max || (min > 0 && min <= 255)) {
 365                 __ipsec_errcode = EIPSEC_INVAL_SPI;
 366                 return -1;
 367         }
 368         switch (src->sa_family) {
 369         case AF_INET:
 370                 plen = sizeof(struct in_addr) << 3;
 371                 break;
 372         case AF_INET6:
 373                 plen = sizeof(struct in6_addr) << 3;
 374                 break;
 375         default:
 376                 __ipsec_errcode = EIPSEC_INVAL_FAMILY;
 377                 return -1;
 378         }
 379
 380         /* create new sadb_msg to send. */
 381         len = sizeof(struct sadb_msg)
 382                 + sizeof(struct sadb_x_sa2)
 383                 + sizeof(struct sadb_address)
 384                 + PFKEY_ALIGN8(src->sa_len)
 385                 + sizeof(struct sadb_address)
 386                 + PFKEY_ALIGN8(dst->sa_len);
 387
 388         if (min > 255 && max < ~0) {
 389                 need_spirange++;
 390                 len += sizeof(struct sadb_spirange);
 391         }
 392
 393         if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
 394                 __ipsec_set_strerror(strerror(errno));
 395                 return -1;
 396         }
 397         ep = ((caddr_t)newmsg) + len;
 398
 399         p = pfkey_setsadbmsg((caddr_t)newmsg, ep, SADB_GETSPI,
 400             len, satype, seq, getpid());
 401         if (!p) {
 402                 free(newmsg);
 403                 return -1;
 404         }
 405
 406         p = pfkey_setsadbxsa2(p, ep, mode, reqid);
 407         if (!p) {
 408                 free(newmsg);
 409                 return -1;
 410         }
 411
 412         /* set sadb_address for source */
 413         p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_SRC, src, plen,
 414             IPSEC_ULPROTO_ANY);
 415         if (!p) {
 416                 free(newmsg);
 417                 return -1;
 418         }
 419
 420         /* set sadb_address for destination */
 421         p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_DST, dst, plen,
 422             IPSEC_ULPROTO_ANY);
 423         if (!p) {
 424                 free(newmsg);
 425                 return -1;
 426         }
 427
 428         /* proccessing spi range */
 429         if (need_spirange) {
 430                 struct sadb_spirange spirange;
 431
 432                 if (p + sizeof(spirange) > ep) {
 433                         free(newmsg);
 434                         return -1;
 435                 }
 436
 437                 memset(&spirange, 0, sizeof(spirange));
 438                 spirange.sadb_spirange_len = PFKEY_UNIT64(sizeof(spirange));
 439                 spirange.sadb_spirange_exttype = SADB_EXT_SPIRANGE;
 440                 spirange.sadb_spirange_min = min;
 441                 spirange.sadb_spirange_max = max;
 442
 443                 memcpy(p, &spirange, sizeof(spirange));
 444
 445                 p += sizeof(spirange);
 446         }
 447         if (p != ep) {
 448                 free(newmsg);
 449                 return -1;
 450         }
 451
 452         /* send message */
 453         len = pfkey_send(so, newmsg, len);
 454         free(newmsg);
 455
 456         if (len < 0)
 457                 return -1;
 458
 459         __ipsec_errcode = EIPSEC_NO_ERROR;
 460         return len;
 461 }
 462
 463 /*
 464  * sending SADB_UPDATE message to the kernel.
 465  * The length of key material is a_keylen + e_keylen.
 466  * OUT:
 467  *      positive: success and return length sent.
 468  *      -1      : error occured, and set errno.
 469  */
 470 int
 471 pfkey_send_update(so, satype, mode, src, dst, spi, reqid, wsize,
 472                 keymat, e_type, e_keylen, a_type, a_keylen, flags,
 473                 l_alloc, l_bytes, l_addtime, l_usetime, seq)
 474         int so;
 475         u_int satype, mode, wsize;
 476         struct sockaddr *src, *dst;
 477         u_int32_t spi, reqid;
 478         caddr_t keymat;
 479         u_int e_type, e_keylen, a_type, a_keylen, flags;
 480         u_int32_t l_alloc;
 481         u_int64_t l_bytes, l_addtime, l_usetime;
 482         u_int32_t seq;
 483 {
 484         int len;
 485         if ((len = pfkey_send_x1(so, SADB_UPDATE, satype, mode, src, dst, spi,
 486                         reqid, wsize,
 487                         keymat, e_type, e_keylen, a_type, a_keylen, flags,
 488                         l_alloc, l_bytes, l_addtime, l_usetime, seq)) < 0)
 489                 return -1;
 490
 491         return len;
 492 }
 493
 494 /*
 495  * sending SADB_ADD message to the kernel.
 496  * The length of key material is a_keylen + e_keylen.
 497  * OUT:
 498  *      positive: success and return length sent.
 499  *      -1      : error occured, and set errno.
 500  */
 501 int
 502 pfkey_send_add(so, satype, mode, src, dst, spi, reqid, wsize,
 503                 keymat, e_type, e_keylen, a_type, a_keylen, flags,
 504                 l_alloc, l_bytes, l_addtime, l_usetime, seq)
 505         int so;
 506         u_int satype, mode, wsize;
 507         struct sockaddr *src, *dst;
 508         u_int32_t spi, reqid;
 509         caddr_t keymat;
 510         u_int e_type, e_keylen, a_type, a_keylen, flags;
 511         u_int32_t l_alloc;
 512         u_int64_t l_bytes, l_addtime, l_usetime;
 513         u_int32_t seq;
 514 {
 515         int len;
 516         if ((len = pfkey_send_x1(so, SADB_ADD, satype, mode, src, dst, spi,
 517                         reqid, wsize,
 518                         keymat, e_type, e_keylen, a_type, a_keylen, flags,
 519                         l_alloc, l_bytes, l_addtime, l_usetime, seq)) < 0)
 520                 return -1;
 521
 522         return len;
 523 }
 524
 525 /*
 526  * sending SADB_DELETE message to the kernel.
 527  * OUT:
 528  *      positive: success and return length sent.
 529  *      -1      : error occured, and set errno.
 530  */
 531 int
 532 pfkey_send_delete(so, satype, mode, src, dst, spi)
 533         int so;
 534         u_int satype, mode;
 535         struct sockaddr *src, *dst;
 536         u_int32_t spi;
 537 {
 538         int len;
 539         if ((len = pfkey_send_x2(so, SADB_DELETE, satype, mode, src, dst, spi)) < 0)
 540                 return -1;
 541
 542         return len;
 543 }
 544
 545 /*
 546  * sending SADB_DELETE without spi to the kernel.  This is
 547  * the "delete all" request (an extension also present in
 548  * Solaris).
 549  *
 550  * OUT:
 551  *      positive: success and return length sent
 552  *      -1      : error occured, and set errno
 553  */
 554 int
 555 pfkey_send_delete_all(so, satype, mode, src, dst)
 556         int so;
 557         u_int satype, mode;
 558         struct sockaddr *src, *dst;
 559 {
 560         struct sadb_msg *newmsg;
 561         int len;
 562         caddr_t p;
 563         int plen;
 564         caddr_t ep;
 565
 566         /* validity check */
 567         if (src == NULL || dst == NULL) {
 568                 __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
 569                 return -1;
 570         }
 571         if (src->sa_family != dst->sa_family) {
 572                 __ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
 573                 return -1;
 574         }
 575         switch (src->sa_family) {
 576         case AF_INET:
 577                 plen = sizeof(struct in_addr) << 3;
 578                 break;
 579         case AF_INET6:
 580                 plen = sizeof(struct in6_addr) << 3;
 581                 break;
 582         default:
 583                 __ipsec_errcode = EIPSEC_INVAL_FAMILY;
 584                 return -1;
 585         }
 586
 587         /* create new sadb_msg to reply. */
 588         len = sizeof(struct sadb_msg)
 589                 + sizeof(struct sadb_address)
 590                 + PFKEY_ALIGN8(src->sa_len)
 591                 + sizeof(struct sadb_address)
 592                 + PFKEY_ALIGN8(dst->sa_len);
 593
 594         if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
 595                 __ipsec_set_strerror(strerror(errno));
 596                 return -1;
 597         }
 598         ep = ((caddr_t)newmsg) + len;
 599
 600         p = pfkey_setsadbmsg((caddr_t)newmsg, ep, SADB_DELETE, len, satype, 0,
 601             getpid());
 602         if (!p) {
 603                 free(newmsg);
 604                 return -1;
 605         }
 606         p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_SRC, src, plen,
 607             IPSEC_ULPROTO_ANY);
 608         if (!p) {
 609                 free(newmsg);
 610                 return -1;
 611         }
 612         p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_DST, dst, plen,
 613             IPSEC_ULPROTO_ANY);
 614         if (!p || p != ep) {
 615                 free(newmsg);
 616                 return -1;
 617         }
 618
 619         /* send message */
 620         len = pfkey_send(so, newmsg, len);
 621         free(newmsg);
 622
 623         if (len < 0)
 624                 return -1;
 625
 626         __ipsec_errcode = EIPSEC_NO_ERROR;
 627         return len;
 628 }
 629
 630 /*
 631  * sending SADB_GET message to the kernel.
 632  * OUT:
 633  *      positive: success and return length sent.
 634  *      -1      : error occured, and set errno.
 635  */
 636 int
 637 pfkey_send_get(so, satype, mode, src, dst, spi)
 638         int so;
 639         u_int satype, mode;
 640         struct sockaddr *src, *dst;
 641         u_int32_t spi;
 642 {
 643         int len;
 644         if ((len = pfkey_send_x2(so, SADB_GET, satype, mode, src, dst, spi)) < 0)
 645                 return -1;
 646
 647         return len;
 648 }
 649
 650 /*
 651  * sending SADB_REGISTER message to the kernel.
 652  * OUT:
 653  *      positive: success and return length sent.
 654  *      -1      : error occured, and set errno.
 655  */
 656 int
 657 pfkey_send_register(so, satype)
 658         int so;
 659         u_int satype;
 660 {
 661         int len, algno;
 662
 663         if (satype == PF_UNSPEC) {
 664                 for (algno = 0;
 665                      algno < sizeof(supported_map)/sizeof(supported_map[0]);
 666                      algno++) {
 667                         if (ipsec_supported[algno]) {
 668                                 free(ipsec_supported[algno]);
 669                                 ipsec_supported[algno] = NULL;
 670                         }
 671                 }
 672         } else {
 673                 algno = findsupportedmap(satype);
 674                 if (algno == -1) {
 675                         __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
 676                         return -1;
 677                 }
 678
 679                 if (ipsec_supported[algno]) {
 680                         free(ipsec_supported[algno]);
 681                         ipsec_supported[algno] = NULL;
 682                 }
 683         }
 684
 685         if ((len = pfkey_send_x3(so, SADB_REGISTER, satype)) < 0)
 686                 return -1;
 687
 688         return len;
 689 }
 690
 691 /*
 692  * receiving SADB_REGISTER message from the kernel, and copy buffer for
 693  * sadb_supported returned into ipsec_supported.
 694  * OUT:
 695  *       0: success and return length sent.
 696  *      -1: error occured, and set errno.
 697  */
 698 int
 699 pfkey_recv_register(so)
 700         int so;
 701 {
 702         pid_t pid = getpid();
 703         struct sadb_msg *newmsg;
 704         int error = -1;
 705
 706         /* receive message */
 707         do {
 708                 if ((newmsg = pfkey_recv(so)) == NULL)
 709                         return -1;
 710         } while (newmsg->sadb_msg_type != SADB_REGISTER
 711             || newmsg->sadb_msg_pid != pid);
 712
 713         /* check and fix */
 714         newmsg->sadb_msg_len = PFKEY_UNUNIT64(newmsg->sadb_msg_len);
 715
 716         error = pfkey_set_supported(newmsg, newmsg->sadb_msg_len);
 717         free(newmsg);
 718
 719         if (error == 0)
 720                 __ipsec_errcode = EIPSEC_NO_ERROR;
 721
 722         return error;
 723 }
 724
 725 /*
 726  * receiving SADB_REGISTER message from the kernel, and copy buffer for
 727  * sadb_supported returned into ipsec_supported.
 728  * NOTE: sadb_msg_len must be host order.
 729  * IN:
 730  *      tlen: msg length, it's to makeing sure.
 731  * OUT:
 732  *       0: success and return length sent.
 733  *      -1: error occured, and set errno.
 734  */
 735 int
 736 pfkey_set_supported(msg, tlen)
 737         struct sadb_msg *msg;
 738         int tlen;
 739 {
 740         struct sadb_supported *sup;
 741         caddr_t p;
 742         caddr_t ep;
 743
 744         /* validity */
 745         if (msg->sadb_msg_len != tlen) {
 746                 __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
 747                 return -1;
 748         }
 749
 750         p = (caddr_t)msg;
 751         ep = p + tlen;
 752
 753         p += sizeof(struct sadb_msg);
 754
 755         while (p < ep) {
 756                 sup = (struct sadb_supported *)p;
 757                 if (ep < p + sizeof(*sup) ||
 758                     PFKEY_EXTLEN(sup) < sizeof(*sup) ||
 759                     ep < p + sup->sadb_supported_len) {
 760                         /* invalid format */
 761                         break;
 762                 }
 763
 764                 switch (sup->sadb_supported_exttype) {
 765                 case SADB_EXT_SUPPORTED_AUTH:
 766                 case SADB_EXT_SUPPORTED_ENCRYPT:
 767                         break;
 768                 default:
 769                         __ipsec_errcode = EIPSEC_INVAL_SATYPE;
 770                         return -1;
 771                 }
 772
 773                 /* fixed length */
 774                 sup->sadb_supported_len = PFKEY_EXTLEN(sup);
 775
 776                 /* set supported map */
 777                 if (setsupportedmap(sup) != 0)
 778                         return -1;
 779
 780                 p += sup->sadb_supported_len;
 781         }
 782
 783         if (p != ep) {
 784                 __ipsec_errcode = EIPSEC_INVAL_SATYPE;
 785                 return -1;
 786         }
 787
 788         __ipsec_errcode = EIPSEC_NO_ERROR;
 789
 790         return 0;
 791 }
 792
 793 /*
 794  * sending SADB_FLUSH message to the kernel.
 795  * OUT:
 796  *      positive: success and return length sent.
 797  *      -1      : error occured, and set errno.
 798  */
 799 int
 800 pfkey_send_flush(so, satype)
 801         int so;
 802         u_int satype;
 803 {
 804         int len;
 805
 806         if ((len = pfkey_send_x3(so, SADB_FLUSH, satype)) < 0)
 807                 return -1;
 808
 809         return len;
 810 }
 811
 812 /*
 813  * sending SADB_DUMP message to the kernel.
 814  * OUT:
 815  *      positive: success and return length sent.
 816  *      -1      : error occured, and set errno.
 817  */
 818 int
 819 pfkey_send_dump(so, satype)
 820         int so;
 821         u_int satype;
 822 {
 823         int len;
 824
 825         if ((len = pfkey_send_x3(so, SADB_DUMP, satype)) < 0)
 826                 return -1;
 827
 828         return len;
 829 }
 830
 831 /*
 832  * sending SADB_X_PROMISC message to the kernel.
 833  * NOTE that this function handles promisc mode toggle only.
 834  * IN:
 835  *      flag:   set promisc off if zero, set promisc on if non-zero.
 836  * OUT:
 837  *      positive: success and return length sent.
 838  *      -1      : error occured, and set errno.
 839  *      0     : error occured, and set errno.
 840  *      others: a pointer to new allocated buffer in which supported
 841  *              algorithms is.
 842  */
 843 int
 844 pfkey_send_promisc_toggle(so, flag)
 845         int so;
 846         int flag;
 847 {
 848         int len;
 849
 850         if ((len = pfkey_send_x3(so, SADB_X_PROMISC, (flag ? 1 : 0))) < 0)
 851                 return -1;
 852
 853         return len;
 854 }
 855
 856 /*
 857  * sending SADB_X_SPDADD message to the kernel.
 858  * OUT:
 859  *      positive: success and return length sent.
 860  *      -1      : error occured, and set errno.
 861  */
 862 int
 863 pfkey_send_spdadd(so, src, prefs, dst, prefd, proto, policy, policylen, seq)
 864         int so;
 865         struct sockaddr *src, *dst;
 866         u_int prefs, prefd, proto;
 867         caddr_t policy;
 868         int policylen;
 869         u_int32_t seq;
 870 {
 871         int len;
 872
 873         if ((len = pfkey_send_x4(so, SADB_X_SPDADD,
 874                                 src, prefs, dst, prefd, proto,
 875                                 0, 0,
 876                                 policy, policylen, seq)) < 0)
 877                 return -1;
 878
 879         return len;
 880 }
 881
 882 /*
 883  * sending SADB_X_SPDADD message to the kernel.
 884  * OUT:
 885  *      positive: success and return length sent.
 886  *      -1      : error occured, and set errno.
 887  */
 888 int
 889 pfkey_send_spdadd2(so, src, prefs, dst, prefd, proto, ltime, vtime,
 890                 policy, policylen, seq)
 891         int so;
 892         struct sockaddr *src, *dst;
 893         u_int prefs, prefd, proto;
 894         u_int64_t ltime, vtime;
 895         caddr_t policy;
 896         int policylen;
 897         u_int32_t seq;
 898 {
 899         int len;
 900
 901         if ((len = pfkey_send_x4(so, SADB_X_SPDADD,
 902                                 src, prefs, dst, prefd, proto,
 903                                 ltime, vtime,
 904                                 policy, policylen, seq)) < 0)
 905                 return -1;
 906
 907         return len;
 908 }
 909
 910 /*
 911  * sending SADB_X_SPDUPDATE message to the kernel.
 912  * OUT:
 913  *      positive: success and return length sent.
 914  *      -1      : error occured, and set errno.
 915  */
 916 int
 917 pfkey_send_spdupdate(so, src, prefs, dst, prefd, proto, policy, policylen, seq)
 918         int so;
 919         struct sockaddr *src, *dst;
 920         u_int prefs, prefd, proto;
 921         caddr_t policy;
 922         int policylen;
 923         u_int32_t seq;
 924 {
 925         int len;
 926
 927         if ((len = pfkey_send_x4(so, SADB_X_SPDUPDATE,
 928                                 src, prefs, dst, prefd, proto,
 929                                 0, 0,
 930                                 policy, policylen, seq)) < 0)
 931                 return -1;
 932
 933         return len;
 934 }
 935
 936 /*
 937  * sending SADB_X_SPDUPDATE message to the kernel.
 938  * OUT:
 939  *      positive: success and return length sent.
 940  *      -1      : error occured, and set errno.
 941  */
 942 int
 943 pfkey_send_spdupdate2(so, src, prefs, dst, prefd, proto, ltime, vtime,
 944                 policy, policylen, seq)
 945         int so;
 946         struct sockaddr *src, *dst;
 947         u_int prefs, prefd, proto;
 948         u_int64_t ltime, vtime;
 949         caddr_t policy;
 950         int policylen;
 951         u_int32_t seq;
 952 {
 953         int len;
 954
 955         if ((len = pfkey_send_x4(so, SADB_X_SPDUPDATE,
 956                                 src, prefs, dst, prefd, proto,
 957                                 ltime, vtime,
 958                                 policy, policylen, seq)) < 0)
 959                 return -1;
 960
 961         return len;
 962 }
 963
 964 /*
 965  * sending SADB_X_SPDDELETE message to the kernel.
 966  * OUT:
 967  *      positive: success and return length sent.
 968  *      -1      : error occured, and set errno.
 969  */
 970 int
 971 pfkey_send_spddelete(so, src, prefs, dst, prefd, proto, policy, policylen, seq)
 972         int so;
 973         struct sockaddr *src, *dst;
 974         u_int prefs, prefd, proto;
 975         caddr_t policy;
 976         int policylen;
 977         u_int32_t seq;
 978 {
 979         int len;
 980
 981         if (policylen != sizeof(struct sadb_x_policy)) {
 982                 __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
 983                 return -1;
 984         }
 985
 986         if ((len = pfkey_send_x4(so, SADB_X_SPDDELETE,
 987                                 src, prefs, dst, prefd, proto,
 988                                 0, 0,
 989                                 policy, policylen, seq)) < 0)
 990                 return -1;
 991
 992         return len;
 993 }
 994
 995 /*
 996  * sending SADB_X_SPDDELETE message to the kernel.
 997  * OUT:
 998  *      positive: success and return length sent.
 999  *      -1      : error occured, and set errno.
1000  */
1001 int
1002 pfkey_send_spddelete2(so, spid)
1003         int so;
1004         u_int32_t spid;
1005 {
1006         int len;
1007
1008         if ((len = pfkey_send_x5(so, SADB_X_SPDDELETE2, spid)) < 0)
1009                 return -1;
1010
1011         return len;
1012 }
1013
1014 /*
1015  * sending SADB_X_SPDGET message to the kernel.
1016  * OUT:
1017  *      positive: success and return length sent.
1018  *      -1      : error occured, and set errno.
1019  */
1020 int
1021 pfkey_send_spdget(so, spid)
1022         int so;
1023         u_int32_t spid;
1024 {
1025         int len;
1026
1027         if ((len = pfkey_send_x5(so, SADB_X_SPDGET, spid)) < 0)
1028                 return -1;
1029
1030         return len;
1031 }
1032
1033 /*
1034  * sending SADB_X_SPDSETIDX message to the kernel.
1035  * OUT:
1036  *      positive: success and return length sent.
1037  *      -1      : error occured, and set errno.
1038  */
1039 int
1040 pfkey_send_spdsetidx(so, src, prefs, dst, prefd, proto, policy, policylen, seq)
1041         int so;
1042         struct sockaddr *src, *dst;
1043         u_int prefs, prefd, proto;
1044         caddr_t policy;
1045         int policylen;
1046         u_int32_t seq;
1047 {
1048         int len;
1049
1050         if (policylen != sizeof(struct sadb_x_policy)) {
1051                 __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
1052                 return -1;
1053         }
1054
1055         if ((len = pfkey_send_x4(so, SADB_X_SPDSETIDX,
1056                                 src, prefs, dst, prefd, proto,
1057                                 0, 0,
1058                                 policy, policylen, seq)) < 0)
1059                 return -1;
1060
1061         return len;
1062 }
1063
1064 /*
1065  * sending SADB_SPDFLUSH message to the kernel.
1066  * OUT:
1067  *      positive: success and return length sent.
1068  *      -1      : error occured, and set errno.
1069  */
1070 int
1071 pfkey_send_spdflush(so)
1072         int so;
1073 {
1074         int len;
1075
1076         if ((len = pfkey_send_x3(so, SADB_X_SPDFLUSH, SADB_SATYPE_UNSPEC)) < 0)
1077                 return -1;
1078
1079         return len;
1080 }
1081
1082 /*
1083  * sending SADB_SPDDUMP message to the kernel.
1084  * OUT:
1085  *      positive: success and return length sent.
1086  *      -1      : error occured, and set errno.
1087  */
1088 int
1089 pfkey_send_spddump(so)
1090         int so;
1091 {
1092         int len;
1093
1094         if ((len = pfkey_send_x3(so, SADB_X_SPDDUMP, SADB_SATYPE_UNSPEC)) < 0)
1095                 return -1;
1096
1097         return len;
1098 }
1099
1100 /* sending SADB_ADD or SADB_UPDATE message to the kernel */
1101 static int
1102 pfkey_send_x1(so, type, satype, mode, src, dst, spi, reqid, wsize,
1103                 keymat, e_type, e_keylen, a_type, a_keylen, flags,
1104                 l_alloc, l_bytes, l_addtime, l_usetime, seq)
1105         int so;
1106         u_int type, satype, mode;
1107         struct sockaddr *src, *dst;
1108         u_int32_t spi, reqid;
1109         u_int wsize;
1110         caddr_t keymat;
1111         u_int e_type, e_keylen, a_type, a_keylen, flags;
1112         u_int32_t l_alloc, l_bytes, l_addtime, l_usetime, seq;
1113 {
1114         struct sadb_msg *newmsg;
1115         int len;
1116         caddr_t p;
1117         int plen;
1118         caddr_t ep;
1119
1120         /* validity check */
1121         if (src == NULL || dst == NULL) {
1122                 __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
1123                 return -1;
1124         }
1125         if (src->sa_family != dst->sa_family) {
1126                 __ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
1127                 return -1;
1128         }
1129         switch (src->sa_family) {
1130         case AF_INET:
1131                 plen = sizeof(struct in_addr) << 3;
1132                 break;
1133         case AF_INET6:
1134                 plen = sizeof(struct in6_addr) << 3;
1135                 break;
1136         default:
1137                 __ipsec_errcode = EIPSEC_INVAL_FAMILY;
1138                 return -1;
1139         }
1140
1141         switch (satype) {
1142         case SADB_SATYPE_ESP:
1143                 if (e_type == SADB_EALG_NONE) {
1144                         __ipsec_errcode = EIPSEC_NO_ALGS;
1145                         return -1;
1146                 }
1147                 break;
1148         case SADB_SATYPE_AH:
1149                 if (e_type != SADB_EALG_NONE) {
1150                         __ipsec_errcode = EIPSEC_INVAL_ALGS;
1151                         return -1;
1152                 }
1153                 if (a_type == SADB_AALG_NONE) {
1154                         __ipsec_errcode = EIPSEC_NO_ALGS;
1155                         return -1;
1156                 }
1157                 break;
1158         case SADB_X_SATYPE_IPCOMP:
1159                 if (e_type == SADB_X_CALG_NONE) {
1160                         __ipsec_errcode = EIPSEC_INVAL_ALGS;
1161                         return -1;
1162                 }
1163                 if (a_type != SADB_AALG_NONE) {
1164                         __ipsec_errcode = EIPSEC_NO_ALGS;
1165                         return -1;
1166                 }
1167                 break;
1168         default:
1169                 __ipsec_errcode = EIPSEC_INVAL_SATYPE;
1170                 return -1;
1171         }
1172
1173         /* create new sadb_msg to reply. */
1174         len = sizeof(struct sadb_msg)
1175                 + sizeof(struct sadb_sa)
1176                 + sizeof(struct sadb_x_sa2)
1177                 + sizeof(struct sadb_address)
1178                 + PFKEY_ALIGN8(src->sa_len)
1179                 + sizeof(struct sadb_address)
1180                 + PFKEY_ALIGN8(dst->sa_len)
1181                 + sizeof(struct sadb_lifetime)
1182                 + sizeof(struct sadb_lifetime);
1183
1184         if (e_type != SADB_EALG_NONE)
1185                 len += (sizeof(struct sadb_key) + PFKEY_ALIGN8(e_keylen));
1186         if (a_type != SADB_AALG_NONE)
1187                 len += (sizeof(struct sadb_key) + PFKEY_ALIGN8(a_keylen));
1188
1189         if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
1190                 __ipsec_set_strerror(strerror(errno));
1191                 return -1;
1192         }
1193         ep = ((caddr_t)newmsg) + len;
1194
1195         p = pfkey_setsadbmsg((caddr_t)newmsg, ep, type, len,
1196                              satype, seq, getpid());
1197         if (!p) {
1198                 free(newmsg);
1199                 return -1;
1200         }
1201         p = pfkey_setsadbsa(p, ep, spi, wsize, a_type, e_type, flags);
1202         if (!p) {
1203                 free(newmsg);
1204                 return -1;
1205         }
1206         p = pfkey_setsadbxsa2(p, ep, mode, reqid);
1207         if (!p) {
1208                 free(newmsg);
1209                 return -1;
1210         }
1211         p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_SRC, src, plen,
1212             IPSEC_ULPROTO_ANY);
1213         if (!p) {
1214                 free(newmsg);
1215                 return -1;
1216         }
1217         p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_DST, dst, plen,
1218             IPSEC_ULPROTO_ANY);
1219         if (!p) {
1220                 free(newmsg);
1221                 return -1;
1222         }
1223
1224         if (e_type != SADB_EALG_NONE) {
1225                 p = pfkey_setsadbkey(p, ep, SADB_EXT_KEY_ENCRYPT,
1226                                    keymat, e_keylen);
1227                 if (!p) {
1228                         free(newmsg);
1229                         return -1;
1230                 }
1231         }
1232         if (a_type != SADB_AALG_NONE) {
1233                 p = pfkey_setsadbkey(p, ep, SADB_EXT_KEY_AUTH,
1234                                    keymat + e_keylen, a_keylen);
1235                 if (!p) {
1236                         free(newmsg);
1237                         return -1;
1238                 }
1239         }
1240
1241         /* set sadb_lifetime for destination */
1242         p = pfkey_setsadblifetime(p, ep, SADB_EXT_LIFETIME_HARD,
1243                         l_alloc, l_bytes, l_addtime, l_usetime);
1244         if (!p) {
1245                 free(newmsg);
1246                 return -1;
1247         }
1248         p = pfkey_setsadblifetime(p, ep, SADB_EXT_LIFETIME_SOFT,
1249                         l_alloc, l_bytes, l_addtime, l_usetime);
1250         if (!p || p != ep) {
1251                 free(newmsg);
1252                 return -1;
1253         }
1254
1255         /* send message */
1256         len = pfkey_send(so, newmsg, len);
1257         free(newmsg);
1258
1259         if (len < 0)
1260                 return -1;
1261
1262         __ipsec_errcode = EIPSEC_NO_ERROR;
1263         return len;
1264 }
1265
1266 /* sending SADB_DELETE or SADB_GET message to the kernel */
1267 static int
1268 pfkey_send_x2(so, type, satype, mode, src, dst, spi)
1269         int so;
1270         u_int type, satype, mode;
1271         struct sockaddr *src, *dst;
1272         u_int32_t spi;
1273 {
1274         struct sadb_msg *newmsg;
1275         int len;
1276         caddr_t p;
1277         int plen;
1278         caddr_t ep;
1279
1280         /* validity check */
1281         if (src == NULL || dst == NULL) {
1282                 __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
1283                 return -1;
1284         }
1285         if (src->sa_family != dst->sa_family) {
1286                 __ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
1287                 return -1;
1288         }
1289         switch (src->sa_family) {
1290         case AF_INET:
1291                 plen = sizeof(struct in_addr) << 3;
1292                 break;
1293         case AF_INET6:
1294                 plen = sizeof(struct in6_addr) << 3;
1295                 break;
1296         default:
1297                 __ipsec_errcode = EIPSEC_INVAL_FAMILY;
1298                 return -1;
1299         }
1300
1301         /* create new sadb_msg to reply. */
1302         len = sizeof(struct sadb_msg)
1303                 + sizeof(struct sadb_sa)
1304                 + sizeof(struct sadb_address)
1305                 + PFKEY_ALIGN8(src->sa_len)
1306                 + sizeof(struct sadb_address)
1307                 + PFKEY_ALIGN8(dst->sa_len);
1308
1309         if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
1310                 __ipsec_set_strerror(strerror(errno));
1311                 return -1;
1312         }
1313         ep = ((caddr_t)newmsg) + len;
1314
1315         p = pfkey_setsadbmsg((caddr_t)newmsg, ep, type, len, satype, 0,
1316             getpid());
1317         if (!p) {
1318                 free(newmsg);
1319                 return -1;
1320         }
1321         p = pfkey_setsadbsa(p, ep, spi, 0, 0, 0, 0);
1322         if (!p) {
1323                 free(newmsg);
1324                 return -1;
1325         }
1326         p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_SRC, src, plen,
1327             IPSEC_ULPROTO_ANY);
1328         if (!p) {
1329                 free(newmsg);
1330                 return -1;
1331         }
1332         p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_DST, dst, plen,
1333             IPSEC_ULPROTO_ANY);
1334         if (!p || p != ep) {
1335                 free(newmsg);
1336                 return -1;
1337         }
1338
1339         /* send message */
1340         len = pfkey_send(so, newmsg, len);
1341         free(newmsg);
1342
1343         if (len < 0)
1344                 return -1;
1345
1346         __ipsec_errcode = EIPSEC_NO_ERROR;
1347         return len;
1348 }
1349
1350 /*
1351  * sending SADB_REGISTER, SADB_FLUSH, SADB_DUMP or SADB_X_PROMISC message
1352  * to the kernel
1353  */
1354 static int
1355 pfkey_send_x3(so, type, satype)
1356         int so;
1357         u_int type, satype;
1358 {
1359         struct sadb_msg *newmsg;
1360         int len;
1361         caddr_t p;
1362         caddr_t ep;
1363
1364         /* validity check */
1365         switch (type) {
1366         case SADB_X_PROMISC:
1367                 if (satype != 0 && satype != 1) {
1368                         __ipsec_errcode = EIPSEC_INVAL_SATYPE;
1369                         return -1;
1370                 }
1371                 break;
1372         default:
1373                 switch (satype) {
1374                 case SADB_SATYPE_UNSPEC:
1375                 case SADB_SATYPE_AH:
1376                 case SADB_SATYPE_ESP:
1377                 case SADB_X_SATYPE_IPCOMP:
1378                         break;
1379                 default:
1380                         __ipsec_errcode = EIPSEC_INVAL_SATYPE;
1381                         return -1;
1382                 }
1383         }
1384
1385         /* create new sadb_msg to send. */
1386         len = sizeof(struct sadb_msg);
1387
1388         if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
1389                 __ipsec_set_strerror(strerror(errno));
1390                 return -1;
1391         }
1392         ep = ((caddr_t)newmsg) + len;
1393
1394         p = pfkey_setsadbmsg((caddr_t)newmsg, ep, type, len, satype, 0,
1395             getpid());
1396         if (!p || p != ep) {
1397                 free(newmsg);
1398                 return -1;
1399         }
1400
1401         /* send message */
1402         len = pfkey_send(so, newmsg, len);
1403         free(newmsg);
1404
1405         if (len < 0)
1406                 return -1;
1407
1408         __ipsec_errcode = EIPSEC_NO_ERROR;
1409         return len;
1410 }
1411
1412 /* sending SADB_X_SPDADD message to the kernel */
1413 static int
1414 pfkey_send_x4(so, type, src, prefs, dst, prefd, proto,
1415                 ltime, vtime, policy, policylen, seq)
1416         int so;
1417         struct sockaddr *src, *dst;
1418         u_int type, prefs, prefd, proto;
1419         u_int64_t ltime, vtime;
1420         char *policy;
1421         int policylen;
1422         u_int32_t seq;
1423 {
1424         struct sadb_msg *newmsg;
1425         int len;
1426         caddr_t p;
1427         int plen;
1428         caddr_t ep;
1429
1430         /* validity check */
1431         if (src == NULL || dst == NULL) {
1432                 __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
1433                 return -1;
1434         }
1435         if (src->sa_family != dst->sa_family) {
1436                 __ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
1437                 return -1;
1438         }
1439
1440         switch (src->sa_family) {
1441         case AF_INET:
1442                 plen = sizeof(struct in_addr) << 3;
1443                 break;
1444         case AF_INET6:
1445                 plen = sizeof(struct in6_addr) << 3;
1446                 break;
1447         default:
1448                 __ipsec_errcode = EIPSEC_INVAL_FAMILY;
1449                 return -1;
1450         }
1451         if (prefs > plen || prefd > plen) {
1452                 __ipsec_errcode = EIPSEC_INVAL_PREFIXLEN;
1453                 return -1;
1454         }
1455
1456         /* create new sadb_msg to reply. */
1457         len = sizeof(struct sadb_msg)
1458                 + sizeof(struct sadb_address)
1459                 + PFKEY_ALIGN8(src->sa_len)
1460                 + sizeof(struct sadb_address)
1461                 + PFKEY_ALIGN8(src->sa_len)
1462                 + sizeof(struct sadb_lifetime)
1463                 + policylen;
1464
1465         if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
1466                 __ipsec_set_strerror(strerror(errno));
1467                 return -1;
1468         }
1469         ep = ((caddr_t)newmsg) + len;
1470
1471         p = pfkey_setsadbmsg((caddr_t)newmsg, ep, type, len,
1472             SADB_SATYPE_UNSPEC, seq, getpid());
1473         if (!p) {
1474                 free(newmsg);
1475                 return -1;
1476         }
1477         p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_SRC, src, prefs, proto);
1478         if (!p) {
1479                 free(newmsg);
1480                 return -1;
1481         }
1482         p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_DST, dst, prefd, proto);
1483         if (!p) {
1484                 free(newmsg);
1485                 return -1;
1486         }
1487         p = pfkey_setsadblifetime(p, ep, SADB_EXT_LIFETIME_HARD,
1488                         0, 0, ltime, vtime);
1489         if (!p || p + policylen != ep) {
1490                 free(newmsg);
1491                 return -1;
1492         }
1493         memcpy(p, policy, policylen);
1494
1495         /* send message */
1496         len = pfkey_send(so, newmsg, len);
1497         free(newmsg);
1498
1499         if (len < 0)
1500                 return -1;
1501
1502         __ipsec_errcode = EIPSEC_NO_ERROR;
1503         return len;
1504 }
1505
1506 /* sending SADB_X_SPDGET or SADB_X_SPDDELETE message to the kernel */
1507 static int
1508 pfkey_send_x5(so, type, spid)
1509         int so;
1510         u_int type;
1511         u_int32_t spid;
1512 {
1513         struct sadb_msg *newmsg;
1514         struct sadb_x_policy xpl;
1515         int len;
1516         caddr_t p;
1517         caddr_t ep;
1518
1519         /* create new sadb_msg to reply. */
1520         len = sizeof(struct sadb_msg)
1521                 + sizeof(xpl);
1522
1523         if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
1524                 __ipsec_set_strerror(strerror(errno));
1525                 return -1;
1526         }
1527         ep = ((caddr_t)newmsg) + len;
1528
1529         p = pfkey_setsadbmsg((caddr_t)newmsg, ep, type, len,
1530             SADB_SATYPE_UNSPEC, 0, getpid());
1531         if (!p) {
1532                 free(newmsg);
1533                 return -1;
1534         }
1535
1536         if (p + sizeof(xpl) != ep) {
1537                 free(newmsg);
1538                 return -1;
1539         }
1540         memset(&xpl, 0, sizeof(xpl));
1541         xpl.sadb_x_policy_len = PFKEY_UNUNIT64(sizeof(xpl));
1542         xpl.sadb_x_policy_exttype = SADB_X_EXT_POLICY;
1543         xpl.sadb_x_policy_id = spid;
1544         memcpy(p, &xpl, sizeof(xpl));
1545
1546         /* send message */
1547         len = pfkey_send(so, newmsg, len);
1548         free(newmsg);
1549
1550         if (len < 0)
1551                 return -1;
1552
1553         __ipsec_errcode = EIPSEC_NO_ERROR;
1554         return len;
1555 }
1556
1557 /*
1558  * open a socket.
1559  * OUT:
1560  *      -1: fail.
1561  *      others : success and return value of socket.
1562  */
1563 int
1564 pfkey_open()
1565 {
1566         int so;
1567         const int bufsiz = 128 * 1024;  /*is 128K enough?*/
1568
1569         if ((so = socket(PF_KEY, SOCK_RAW, PF_KEY_V2)) < 0) {
1570                 __ipsec_set_strerror(strerror(errno));
1571                 return -1;
1572         }
1573
1574         /*
1575          * This is a temporary workaround for KAME PR 154.
1576          * Don't really care even if it fails.
1577          */
1578         (void)setsockopt(so, SOL_SOCKET, SO_SNDBUF, &bufsiz, sizeof(bufsiz));
1579         (void)setsockopt(so, SOL_SOCKET, SO_RCVBUF, &bufsiz, sizeof(bufsiz));
1580
1581         __ipsec_errcode = EIPSEC_NO_ERROR;
1582         return so;
1583 }
1584
1585 /*
1586  * close a socket.
1587  * OUT:
1588  *       0: success.
1589  *      -1: fail.
1590  */
1591 void
1592 pfkey_close(so)
1593         int so;
1594 {
1595         (void)close(so);
1596
1597         __ipsec_errcode = EIPSEC_NO_ERROR;
1598         return;
1599 }
1600
1601 /*
1602  * receive sadb_msg data, and return pointer to new buffer allocated.
1603  * Must free this buffer later.
1604  * OUT:
1605  *      NULL    : error occured.
1606  *      others  : a pointer to sadb_msg structure.
1607  *
1608  * XXX should be rewritten to pass length explicitly
1609  */
1610 struct sadb_msg *
1611 pfkey_recv(so)
1612         int so;
1613 {
1614         struct sadb_msg buf, *newmsg;
1615         int len, reallen;
1616
1617         while ((len = recv(so, (caddr_t)&buf, sizeof(buf), MSG_PEEK)) < 0) {
1618                 if (errno == EINTR)
1619                         continue;
1620                 __ipsec_set_strerror(strerror(errno));
1621                 return NULL;
1622         }
1623
1624         if (len < sizeof(buf)) {
1625                 recv(so, (caddr_t)&buf, sizeof(buf), 0);
1626                 __ipsec_errcode = EIPSEC_MAX;
1627                 return NULL;
1628         }
1629
1630         /* read real message */
1631         reallen = PFKEY_UNUNIT64(buf.sadb_msg_len);
1632         if ((newmsg = CALLOC(reallen, struct sadb_msg *)) == 0) {
1633                 __ipsec_set_strerror(strerror(errno));
1634                 return NULL;
1635         }
1636
1637         while ((len = recv(so, (caddr_t)newmsg, reallen, 0)) < 0) {
1638                 if (errno == EINTR)
1639                         continue;
1640                 __ipsec_set_strerror(strerror(errno));
1641                 free(newmsg);
1642                 return NULL;
1643         }
1644
1645         if (len != reallen) {
1646                 __ipsec_errcode = EIPSEC_SYSTEM_ERROR;
1647                 free(newmsg);
1648                 return NULL;
1649         }
1650
1651         /* don't trust what the kernel says, validate! */
1652         if (PFKEY_UNUNIT64(newmsg->sadb_msg_len) != len) {
1653                 __ipsec_errcode = EIPSEC_SYSTEM_ERROR;
1654                 free(newmsg);
1655                 return NULL;
1656         }
1657
1658         __ipsec_errcode = EIPSEC_NO_ERROR;
1659         return newmsg;
1660 }
1661
1662 /*
1663  * send message to a socket.
1664  * OUT:
1665  *       others: success and return length sent.
1666  *      -1     : fail.
1667  */
1668 int
1669 pfkey_send(so, msg, len)
1670         int so;
1671         struct sadb_msg *msg;
1672         int len;
1673 {
1674         if ((len = send(so, (caddr_t)msg, len, 0)) < 0) {
1675                 __ipsec_set_strerror(strerror(errno));
1676                 return -1;
1677         }
1678
1679         __ipsec_errcode = EIPSEC_NO_ERROR;
1680         return len;
1681 }
1682
1683 /*
1684  * %%% Utilities
1685  * NOTE: These functions are derived from netkey/key.c in KAME.
1686  */
1687 /*
1688  * set the pointer to each header in this message buffer.
1689  * IN:  msg: pointer to message buffer.
1690  *      mhp: pointer to the buffer initialized like below:
1691  *              caddr_t mhp[SADB_EXT_MAX + 1];
1692  * OUT: -1: invalid.
1693  *       0: valid.
1694  *
1695  * XXX should be rewritten to obtain length explicitly
1696  */
1697 int
1698 pfkey_align(msg, mhp)
1699         struct sadb_msg *msg;
1700         caddr_t *mhp;
1701 {
1702         struct sadb_ext *ext;
1703         int i;
1704         caddr_t p;
1705         caddr_t ep;     /* XXX should be passed from upper layer */
1706
1707         /* validity check */
1708         if (msg == NULL || mhp == NULL) {
1709                 __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
1710                 return -1;
1711         }
1712
1713         /* initialize */
1714         for (i = 0; i < SADB_EXT_MAX + 1; i++)
1715                 mhp[i] = NULL;
1716
1717         mhp[0] = (caddr_t)msg;
1718
1719         /* initialize */
1720         p = (caddr_t) msg;
1721         ep = p + PFKEY_UNUNIT64(msg->sadb_msg_len);
1722
1723         /* skip base header */
1724         p += sizeof(struct sadb_msg);
1725
1726         while (p < ep) {
1727                 ext = (struct sadb_ext *)p;
1728                 if (ep < p + sizeof(*ext) || PFKEY_EXTLEN(ext) < sizeof(*ext) ||
1729                     ep < p + PFKEY_EXTLEN(ext)) {
1730                         /* invalid format */
1731                         break;
1732                 }
1733
1734                 /* duplicate check */
1735                 /* XXX Are there duplication either KEY_AUTH or KEY_ENCRYPT ?*/
1736                 if (mhp[ext->sadb_ext_type] != NULL) {
1737                         __ipsec_errcode = EIPSEC_INVAL_EXTTYPE;
1738                         return -1;
1739                 }
1740
1741                 /* set pointer */
1742                 switch (ext->sadb_ext_type) {
1743                 case SADB_EXT_SA:
1744                 case SADB_EXT_LIFETIME_CURRENT:
1745                 case SADB_EXT_LIFETIME_HARD:
1746                 case SADB_EXT_LIFETIME_SOFT:
1747                 case SADB_EXT_ADDRESS_SRC:
1748                 case SADB_EXT_ADDRESS_DST:
1749                 case SADB_EXT_ADDRESS_PROXY:
1750                 case SADB_EXT_KEY_AUTH:
1751                         /* XXX should to be check weak keys. */
1752                 case SADB_EXT_KEY_ENCRYPT:
1753                         /* XXX should to be check weak keys. */
1754                 case SADB_EXT_IDENTITY_SRC:
1755                 case SADB_EXT_IDENTITY_DST:
1756                 case SADB_EXT_SENSITIVITY:
1757                 case SADB_EXT_PROPOSAL:
1758                 case SADB_EXT_SUPPORTED_AUTH:
1759                 case SADB_EXT_SUPPORTED_ENCRYPT:
1760                 case SADB_EXT_SPIRANGE:
1761                 case SADB_X_EXT_POLICY:
1762                 case SADB_X_EXT_SA2:
1763                         mhp[ext->sadb_ext_type] = (caddr_t)ext;
1764                         break;
1765                 default:
1766                         __ipsec_errcode = EIPSEC_INVAL_EXTTYPE;
1767                         return -1;
1768                 }
1769
1770                 p += PFKEY_EXTLEN(ext);
1771         }
1772
1773         if (p != ep) {
1774                 __ipsec_errcode = EIPSEC_INVAL_SADBMSG;
1775                 return -1;
1776         }
1777
1778         __ipsec_errcode = EIPSEC_NO_ERROR;
1779         return 0;
1780 }
1781
1782 /*
1783  * check basic usage for sadb_msg,
1784  * NOTE: This routine is derived from netkey/key.c in KAME.
1785  * IN:  msg: pointer to message buffer.
1786  *      mhp: pointer to the buffer initialized like below:
1787  *
1788  *              caddr_t mhp[SADB_EXT_MAX + 1];
1789  *
1790  * OUT: -1: invalid.
1791  *       0: valid.
1792  */
1793 int
1794 pfkey_check(mhp)
1795         caddr_t *mhp;
1796 {
1797         struct sadb_msg *msg;
1798
1799         /* validity check */
1800         if (mhp == NULL || mhp[0] == NULL) {
1801                 __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
1802                 return -1;
1803         }
1804
1805         msg = (struct sadb_msg *)mhp[0];
1806
1807         /* check version */
1808         if (msg->sadb_msg_version != PF_KEY_V2) {
1809                 __ipsec_errcode = EIPSEC_INVAL_VERSION;
1810                 return -1;
1811         }
1812
1813         /* check type */
1814         if (msg->sadb_msg_type > SADB_MAX) {
1815                 __ipsec_errcode = EIPSEC_INVAL_MSGTYPE;
1816                 return -1;
1817         }
1818
1819         /* check SA type */
1820         switch (msg->sadb_msg_satype) {
1821         case SADB_SATYPE_UNSPEC:
1822                 switch (msg->sadb_msg_type) {
1823                 case SADB_GETSPI:
1824                 case SADB_UPDATE:
1825                 case SADB_ADD:
1826                 case SADB_DELETE:
1827                 case SADB_GET:
1828                 case SADB_ACQUIRE:
1829                 case SADB_EXPIRE:
1830                         __ipsec_errcode = EIPSEC_INVAL_SATYPE;
1831                         return -1;
1832                 }
1833                 break;
1834         case SADB_SATYPE_ESP:
1835         case SADB_SATYPE_AH:
1836         case SADB_X_SATYPE_IPCOMP:
1837                 switch (msg->sadb_msg_type) {
1838                 case SADB_X_SPDADD:
1839                 case SADB_X_SPDDELETE:
1840                 case SADB_X_SPDGET:
1841                 case SADB_X_SPDDUMP:
1842                 case SADB_X_SPDFLUSH:
1843                         __ipsec_errcode = EIPSEC_INVAL_SATYPE;
1844                         return -1;
1845                 }
1846                 break;
1847         case SADB_SATYPE_RSVP:
1848         case SADB_SATYPE_OSPFV2:
1849         case SADB_SATYPE_RIPV2:
1850         case SADB_SATYPE_MIP:
1851                 __ipsec_errcode = EIPSEC_NOT_SUPPORTED;
1852                 return -1;
1853         case 1: /* XXX: What does it do ? */
1854                 if (msg->sadb_msg_type == SADB_X_PROMISC)
1855                         break;
1856                 /*FALLTHROUGH*/
1857         default:
1858                 __ipsec_errcode = EIPSEC_INVAL_SATYPE;
1859                 return -1;
1860         }
1861
1862         /* check field of upper layer protocol and address family */
1863         if (mhp[SADB_EXT_ADDRESS_SRC] != NULL
1864          && mhp[SADB_EXT_ADDRESS_DST] != NULL) {
1865                 struct sadb_address *src0, *dst0;
1866
1867                 src0 = (struct sadb_address *)(mhp[SADB_EXT_ADDRESS_SRC]);
1868                 dst0 = (struct sadb_address *)(mhp[SADB_EXT_ADDRESS_DST]);
1869
1870                 if (src0->sadb_address_proto != dst0->sadb_address_proto) {
1871                         __ipsec_errcode = EIPSEC_PROTO_MISMATCH;
1872                         return -1;
1873                 }
1874
1875                 if (PFKEY_ADDR_SADDR(src0)->sa_family
1876                  != PFKEY_ADDR_SADDR(dst0)->sa_family) {
1877                         __ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
1878                         return -1;
1879                 }
1880
1881                 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
1882                 case AF_INET:
1883                 case AF_INET6:
1884                         break;
1885                 default:
1886                         __ipsec_errcode = EIPSEC_INVAL_FAMILY;
1887                         return -1;
1888                 }
1889
1890                 /*
1891                  * prefixlen == 0 is valid because there must be the case
1892                  * all addresses are matched.
1893                  */
1894         }
1895
1896         __ipsec_errcode = EIPSEC_NO_ERROR;
1897         return 0;
1898 }
1899
1900 /*
1901  * set data into sadb_msg.
1902  * `buf' must has been allocated sufficiently.
1903  */
1904 static caddr_t
1905 pfkey_setsadbmsg(buf, lim, type, tlen, satype, seq, pid)
1906         caddr_t buf;
1907         caddr_t lim;
1908         u_int type, satype;
1909         u_int tlen;
1910         u_int32_t seq;
1911         pid_t pid;
1912 {
1913         struct sadb_msg *p;
1914         u_int len;
1915
1916         p = (struct sadb_msg *)buf;
1917         len = sizeof(struct sadb_msg);
1918
1919         if (buf + len > lim)
1920                 return NULL;
1921
1922         memset(p, 0, len);
1923         p->sadb_msg_version = PF_KEY_V2;
1924         p->sadb_msg_type = type;
1925         p->sadb_msg_errno = 0;
1926         p->sadb_msg_satype = satype;
1927         p->sadb_msg_len = PFKEY_UNIT64(tlen);
1928         p->sadb_msg_reserved = 0;
1929         p->sadb_msg_seq = seq;
1930         p->sadb_msg_pid = (u_int32_t)pid;
1931
1932         return(buf + len);
1933 }
1934
1935 /*
1936  * copy secasvar data into sadb_address.
1937  * `buf' must has been allocated sufficiently.
1938  */
1939 static caddr_t
1940 pfkey_setsadbsa(buf, lim, spi, wsize, auth, enc, flags)
1941         caddr_t buf;
1942         caddr_t lim;
1943         u_int32_t spi, flags;
1944         u_int wsize, auth, enc;
1945 {
1946         struct sadb_sa *p;
1947         u_int len;
1948
1949         p = (struct sadb_sa *)buf;
1950         len = sizeof(struct sadb_sa);
1951
1952         if (buf + len > lim)
1953                 return NULL;
1954
1955         memset(p, 0, len);
1956         p->sadb_sa_len = PFKEY_UNIT64(len);
1957         p->sadb_sa_exttype = SADB_EXT_SA;
1958         p->sadb_sa_spi = spi;
1959         p->sadb_sa_replay = wsize;
1960         p->sadb_sa_state = SADB_SASTATE_LARVAL;
1961         p->sadb_sa_auth = auth;
1962         p->sadb_sa_encrypt = enc;
1963         p->sadb_sa_flags = flags;
1964
1965         return(buf + len);
1966 }
1967
1968 /*
1969  * set data into sadb_address.
1970  * `buf' must has been allocated sufficiently.
1971  * prefixlen is in bits.
1972  */
1973 static caddr_t
1974 pfkey_setsadbaddr(buf, lim, exttype, saddr, prefixlen, ul_proto)
1975         caddr_t buf;
1976         caddr_t lim;
1977         u_int exttype;
1978         struct sockaddr *saddr;
1979         u_int prefixlen;
1980         u_int ul_proto;
1981 {
1982         struct sadb_address *p;
1983         u_int len;
1984
1985         p = (struct sadb_address *)buf;
1986         len = sizeof(struct sadb_address) + PFKEY_ALIGN8(saddr->sa_len);
1987
1988         if (buf + len > lim)
1989                 return NULL;
1990
1991         memset(p, 0, len);
1992         p->sadb_address_len = PFKEY_UNIT64(len);
1993         p->sadb_address_exttype = exttype & 0xffff;
1994         p->sadb_address_proto = ul_proto & 0xff;
1995         p->sadb_address_prefixlen = prefixlen;
1996         p->sadb_address_reserved = 0;
1997
1998         memcpy(p + 1, saddr, saddr->sa_len);
1999
2000         return(buf + len);
2001 }
2002
2003 /*
2004  * set sadb_key structure after clearing buffer with zero.
2005  * OUT: the pointer of buf + len.
2006  */
2007 static caddr_t
2008 pfkey_setsadbkey(buf, lim, type, key, keylen)
2009         caddr_t buf;
2010         caddr_t lim;
2011         caddr_t key;
2012         u_int type, keylen;
2013 {
2014         struct sadb_key *p;
2015         u_int len;
2016
2017         p = (struct sadb_key *)buf;
2018         len = sizeof(struct sadb_key) + PFKEY_ALIGN8(keylen);
2019
2020         if (buf + len > lim)
2021                 return NULL;
2022
2023         memset(p, 0, len);
2024         p->sadb_key_len = PFKEY_UNIT64(len);
2025         p->sadb_key_exttype = type;
2026         p->sadb_key_bits = keylen << 3;
2027         p->sadb_key_reserved = 0;
2028
2029         memcpy(p + 1, key, keylen);
2030
2031         return buf + len;
2032 }
2033
2034 /*
2035  * set sadb_lifetime structure after clearing buffer with zero.
2036  * OUT: the pointer of buf + len.
2037  */
2038 static caddr_t
2039 pfkey_setsadblifetime(buf, lim, type, l_alloc, l_bytes, l_addtime, l_usetime)
2040         caddr_t buf;
2041         caddr_t lim;
2042         u_int type;
2043         u_int32_t l_alloc, l_bytes, l_addtime, l_usetime;
2044 {
2045         struct sadb_lifetime *p;
2046         u_int len;
2047
2048         p = (struct sadb_lifetime *)buf;
2049         len = sizeof(struct sadb_lifetime);
2050
2051         if (buf + len > lim)
2052                 return NULL;
2053
2054         memset(p, 0, len);
2055         p->sadb_lifetime_len = PFKEY_UNIT64(len);
2056         p->sadb_lifetime_exttype = type;
2057
2058         switch (type) {
2059         case SADB_EXT_LIFETIME_SOFT:
2060                 p->sadb_lifetime_allocations
2061                         = (l_alloc * soft_lifetime_allocations_rate) /100;
2062                 p->sadb_lifetime_bytes
2063                         = (l_bytes * soft_lifetime_bytes_rate) /100;
2064                 p->sadb_lifetime_addtime
2065                         = (l_addtime * soft_lifetime_addtime_rate) /100;
2066                 p->sadb_lifetime_usetime
2067                         = (l_usetime * soft_lifetime_usetime_rate) /100;
2068                 break;
2069         case SADB_EXT_LIFETIME_HARD:
2070                 p->sadb_lifetime_allocations = l_alloc;
2071                 p->sadb_lifetime_bytes = l_bytes;
2072                 p->sadb_lifetime_addtime = l_addtime;
2073                 p->sadb_lifetime_usetime = l_usetime;
2074                 break;
2075         }
2076
2077         return buf + len;
2078 }
2079
2080 /*
2081  * copy secasvar data into sadb_address.
2082  * `buf' must has been allocated sufficiently.
2083  */
2084 static caddr_t
2085 pfkey_setsadbxsa2(buf, lim, mode0, reqid)
2086         caddr_t buf;
2087         caddr_t lim;
2088         u_int32_t mode0;
2089         u_int32_t reqid;
2090 {
2091         struct sadb_x_sa2 *p;
2092         u_int8_t mode = mode0 & 0xff;
2093         u_int len;
2094
2095         p = (struct sadb_x_sa2 *)buf;
2096         len = sizeof(struct sadb_x_sa2);
2097
2098         if (buf + len > lim)
2099                 return NULL;
2100
2101         memset(p, 0, len);
2102         p->sadb_x_sa2_len = PFKEY_UNIT64(len);
2103         p->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
2104         p->sadb_x_sa2_mode = mode;
2105         p->sadb_x_sa2_reqid = reqid;
2106
2107         return(buf + len);
2108 }