xform_ipcomp.c revision 1.51
1 /* $NetBSD: xform_ipcomp.c,v 1.51 2017/08/09 09:48:11 ozaki-r Exp $ */ 2 /* $FreeBSD: src/sys/netipsec/xform_ipcomp.c,v 1.1.4.1 2003/01/24 05:11:36 sam Exp $ */ 3 /* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */ 4 5 /* 6 * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj (at) wabbitt.org) 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 * 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. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: xform_ipcomp.c,v 1.51 2017/08/09 09:48:11 ozaki-r Exp $"); 34 35 /* IP payload compression protocol (IPComp), see RFC 2393 */ 36 #if defined(_KERNEL_OPT) 37 #include "opt_inet.h" 38 #endif 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/mbuf.h> 43 #include <sys/socket.h> 44 #include <sys/kernel.h> 45 #include <sys/protosw.h> 46 #include <sys/sysctl.h> 47 #include <sys/pool.h> 48 #include <sys/pserialize.h> 49 50 #include <netinet/in.h> 51 #include <netinet/in_systm.h> 52 #include <netinet/ip.h> 53 #include <netinet/ip_var.h> 54 55 #include <net/route.h> 56 #include <netipsec/ipsec.h> 57 #include <netipsec/ipsec_private.h> 58 #include <netipsec/xform.h> 59 60 #ifdef INET6 61 #include <netinet/ip6.h> 62 #include <netipsec/ipsec6.h> 63 #endif 64 65 #include <netipsec/ipcomp.h> 66 #include <netipsec/ipcomp_var.h> 67 68 #include <netipsec/key.h> 69 #include <netipsec/key_debug.h> 70 71 #include <opencrypto/cryptodev.h> 72 #include <opencrypto/deflate.h> 73 #include <opencrypto/xform.h> 74 75 percpu_t *ipcompstat_percpu; 76 77 int ipcomp_enable = 1; 78 79 #ifdef __FreeBSD__ 80 SYSCTL_DECL(_net_inet_ipcomp); 81 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, 82 ipcomp_enable, CTLFLAG_RW, &ipcomp_enable, 0, ""); 83 SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS, 84 stats, CTLFLAG_RD, &ipcompstat, ipcompstat, ""); 85 #endif /* __FreeBSD__ */ 86 87 static int ipcomp_input_cb(struct cryptop *crp); 88 static int ipcomp_output_cb(struct cryptop *crp); 89 90 const uint8_t ipcomp_stats[256] = { SADB_CALG_STATS_INIT }; 91 92 static struct pool ipcomp_tdb_crypto_pool; 93 94 const struct comp_algo * 95 ipcomp_algorithm_lookup(int alg) 96 { 97 switch (alg) { 98 case SADB_X_CALG_DEFLATE: 99 return &comp_algo_deflate_nogrow; 100 } 101 return NULL; 102 } 103 104 /* 105 * ipcomp_init() is called when an CPI is being set up. 106 */ 107 static int 108 ipcomp_init(struct secasvar *sav, const struct xformsw *xsp) 109 { 110 const struct comp_algo *tcomp; 111 struct cryptoini cric; 112 int ses; 113 114 /* NB: algorithm really comes in alg_enc and not alg_comp! */ 115 tcomp = ipcomp_algorithm_lookup(sav->alg_enc); 116 if (tcomp == NULL) { 117 DPRINTF(("%s: unsupported compression algorithm %d\n", 118 __func__, sav->alg_comp)); 119 return EINVAL; 120 } 121 sav->alg_comp = sav->alg_enc; /* set for doing histogram */ 122 sav->tdb_xform = xsp; 123 sav->tdb_compalgxform = tcomp; 124 125 /* Initialize crypto session */ 126 memset(&cric, 0, sizeof(cric)); 127 cric.cri_alg = sav->tdb_compalgxform->type; 128 129 ses = crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support); 130 return ses; 131 } 132 133 /* 134 * ipcomp_zeroize() used when IPCA is deleted 135 */ 136 static int 137 ipcomp_zeroize(struct secasvar *sav) 138 { 139 int err; 140 141 err = crypto_freesession(sav->tdb_cryptoid); 142 sav->tdb_cryptoid = 0; 143 return err; 144 } 145 146 /* 147 * ipcomp_input() gets called to uncompress an input packet 148 */ 149 static int 150 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 151 { 152 struct tdb_crypto *tc; 153 struct cryptodesc *crdc; 154 struct cryptop *crp; 155 int error, hlen = IPCOMP_HLENGTH; 156 157 IPSEC_SPLASSERT_SOFTNET(__func__); 158 159 /* Get crypto descriptors */ 160 crp = crypto_getreq(1); 161 if (crp == NULL) { 162 m_freem(m); 163 DPRINTF(("%s: no crypto descriptors\n", __func__)); 164 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 165 return ENOBUFS; 166 } 167 /* Get IPsec-specific opaque pointer */ 168 tc = pool_get(&ipcomp_tdb_crypto_pool, PR_NOWAIT); 169 if (tc == NULL) { 170 m_freem(m); 171 crypto_freereq(crp); 172 DPRINTF(("%s: cannot allocate tdb_crypto\n", __func__)); 173 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 174 return ENOBUFS; 175 } 176 177 error = m_makewritable(&m, 0, m->m_pkthdr.len, M_NOWAIT); 178 if (error) { 179 DPRINTF(("%s: m_makewritable failed\n", __func__)); 180 m_freem(m); 181 pool_put(&ipcomp_tdb_crypto_pool, tc); 182 crypto_freereq(crp); 183 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 184 return error; 185 } 186 187 { 188 int s = pserialize_read_enter(); 189 190 /* 191 * Take another reference to the SA for opencrypto callback. 192 */ 193 if (__predict_false(sav->state == SADB_SASTATE_DEAD)) { 194 pserialize_read_exit(s); 195 pool_put(&ipcomp_tdb_crypto_pool, tc); 196 crypto_freereq(crp); 197 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 198 return ENOENT; 199 } 200 KEY_SA_REF(sav); 201 pserialize_read_exit(s); 202 } 203 204 crdc = crp->crp_desc; 205 206 crdc->crd_skip = skip + hlen; 207 crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 208 crdc->crd_inject = 0; /* unused */ 209 210 /* Decompression operation */ 211 crdc->crd_alg = sav->tdb_compalgxform->type; 212 213 /* Crypto operation descriptor */ 214 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 215 crp->crp_olen = MCLBYTES; /* hint to decompression code */ 216 crp->crp_flags = CRYPTO_F_IMBUF; 217 crp->crp_buf = m; 218 crp->crp_callback = ipcomp_input_cb; 219 crp->crp_sid = sav->tdb_cryptoid; 220 crp->crp_opaque = tc; 221 222 /* These are passed as-is to the callback */ 223 tc->tc_spi = sav->spi; 224 tc->tc_dst = sav->sah->saidx.dst; 225 tc->tc_proto = sav->sah->saidx.proto; 226 tc->tc_protoff = protoff; 227 tc->tc_skip = skip; 228 tc->tc_sav = sav; 229 230 return crypto_dispatch(crp); 231 } 232 233 #ifdef INET6 234 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff) do { \ 235 if (saidx->dst.sa.sa_family == AF_INET6) { \ 236 error = ipsec6_common_input_cb(m, sav, skip, protoff); \ 237 } else { \ 238 error = ipsec4_common_input_cb(m, sav, skip, protoff); \ 239 } \ 240 } while (0) 241 #else 242 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff) \ 243 (error = ipsec4_common_input_cb(m, sav, skip, protoff)) 244 #endif 245 246 /* 247 * IPComp input callback from the crypto driver. 248 */ 249 static int 250 ipcomp_input_cb(struct cryptop *crp) 251 { 252 char buf[IPSEC_ADDRSTRLEN]; 253 struct tdb_crypto *tc; 254 int skip, protoff; 255 struct mbuf *m; 256 struct secasvar *sav; 257 struct secasindex *saidx __diagused; 258 int hlen = IPCOMP_HLENGTH, error, clen; 259 uint8_t nproto; 260 void *addr; 261 uint16_t dport; 262 uint16_t sport; 263 IPSEC_DECLARE_LOCK_VARIABLE; 264 265 KASSERT(crp->crp_opaque != NULL); 266 tc = crp->crp_opaque; 267 skip = tc->tc_skip; 268 protoff = tc->tc_protoff; 269 m = crp->crp_buf; 270 271 /* find the source port for NAT-T */ 272 nat_t_ports_get(m, &dport, &sport); 273 274 IPSEC_ACQUIRE_GLOBAL_LOCKS(); 275 276 sav = tc->tc_sav; 277 if (__predict_false(!SADB_SASTATE_USABLE_P(sav))) { 278 KEY_SA_UNREF(&sav); 279 sav = KEY_LOOKUP_SA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, 280 sport, dport); 281 if (sav == NULL) { 282 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 283 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 284 error = ENOBUFS; /*XXX*/ 285 goto bad; 286 } 287 } 288 289 saidx = &sav->sah->saidx; 290 KASSERTMSG(saidx->dst.sa.sa_family == AF_INET || 291 saidx->dst.sa.sa_family == AF_INET6, 292 "unexpected protocol family %u", saidx->dst.sa.sa_family); 293 294 /* Check for crypto errors */ 295 if (crp->crp_etype) { 296 /* Reset the session ID */ 297 if (sav->tdb_cryptoid != 0) 298 sav->tdb_cryptoid = crp->crp_sid; 299 300 if (crp->crp_etype == EAGAIN) { 301 KEY_SA_UNREF(&sav); 302 IPSEC_RELEASE_GLOBAL_LOCKS(); 303 return crypto_dispatch(crp); 304 } 305 306 IPCOMP_STATINC(IPCOMP_STAT_NOXFORM); 307 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 308 error = crp->crp_etype; 309 goto bad; 310 } 311 312 IPCOMP_STATINC(IPCOMP_STAT_HIST + ipcomp_stats[sav->alg_comp]); 313 314 /* Update the counters */ 315 IPCOMP_STATADD(IPCOMP_STAT_IBYTES, m->m_pkthdr.len - skip - hlen); 316 317 318 clen = crp->crp_olen; /* Length of data after processing */ 319 320 /* Release the crypto descriptors */ 321 pool_put(&ipcomp_tdb_crypto_pool, tc); 322 tc = NULL; 323 crypto_freereq(crp), crp = NULL; 324 325 /* In case it's not done already, adjust the size of the mbuf chain */ 326 m->m_pkthdr.len = clen + hlen + skip; 327 328 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { 329 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); /*XXX*/ 330 DPRINTF(("%s: m_pullup failed\n", __func__)); 331 error = EINVAL; /*XXX*/ 332 goto bad; 333 } 334 335 /* Keep the next protocol field */ 336 addr = (uint8_t*) mtod(m, struct ip *) + skip; 337 nproto = ((struct ipcomp *) addr)->comp_nxt; 338 switch (nproto) { 339 case IPPROTO_IPCOMP: 340 case IPPROTO_AH: 341 case IPPROTO_ESP: 342 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 343 DPRINTF(("%s: nested ipcomp, IPCA %s/%08lx\n", __func__, 344 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 345 (u_long) ntohl(sav->spi))); 346 error = EINVAL; 347 goto bad; 348 default: 349 break; 350 } 351 352 /* Remove the IPCOMP header */ 353 error = m_striphdr(m, skip, hlen); 354 if (error) { 355 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 356 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 357 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 358 (u_long) ntohl(sav->spi))); 359 goto bad; 360 } 361 362 /* Restore the Next Protocol field */ 363 m_copyback(m, protoff, sizeof(uint8_t), (uint8_t *) &nproto); 364 365 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff); 366 367 KEY_SA_UNREF(&sav); 368 IPSEC_RELEASE_GLOBAL_LOCKS(); 369 return error; 370 bad: 371 if (sav) 372 KEY_SA_UNREF(&sav); 373 IPSEC_RELEASE_GLOBAL_LOCKS(); 374 if (m) 375 m_freem(m); 376 if (tc != NULL) 377 pool_put(&ipcomp_tdb_crypto_pool, tc); 378 if (crp) 379 crypto_freereq(crp); 380 return error; 381 } 382 383 /* 384 * IPComp output routine, called by ipsec[46]_process_packet() 385 */ 386 static int 387 ipcomp_output( 388 struct mbuf *m, 389 struct ipsecrequest *isr, 390 struct secasvar *sav, 391 struct mbuf **mp, 392 int skip, 393 int protoff 394 ) 395 { 396 char buf[IPSEC_ADDRSTRLEN]; 397 const struct comp_algo *ipcompx; 398 int error, ralen, hlen, maxpacketsize; 399 struct cryptodesc *crdc; 400 struct cryptop *crp; 401 struct tdb_crypto *tc; 402 403 IPSEC_SPLASSERT_SOFTNET(__func__); 404 KASSERT(sav != NULL); 405 KASSERT(sav->tdb_compalgxform != NULL); 406 ipcompx = sav->tdb_compalgxform; 407 408 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 409 410 /* Don't process the packet if it is too short */ 411 if (ralen < ipcompx->minlen) { 412 IPCOMP_STATINC(IPCOMP_STAT_MINLEN); 413 return ipsec_process_done(m, isr, sav); 414 } 415 416 hlen = IPCOMP_HLENGTH; 417 418 IPCOMP_STATINC(IPCOMP_STAT_OUTPUT); 419 420 /* Check for maximum packet size violations. */ 421 switch (sav->sah->saidx.dst.sa.sa_family) { 422 #ifdef INET 423 case AF_INET: 424 maxpacketsize = IP_MAXPACKET; 425 break; 426 #endif /* INET */ 427 #ifdef INET6 428 case AF_INET6: 429 maxpacketsize = IPV6_MAXPACKET; 430 break; 431 #endif /* INET6 */ 432 default: 433 IPCOMP_STATINC(IPCOMP_STAT_NOPF); 434 DPRINTF(("%s: unknown/unsupported protocol family %d" 435 ", IPCA %s/%08lx\n", __func__, 436 sav->sah->saidx.dst.sa.sa_family, 437 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 438 (u_long) ntohl(sav->spi))); 439 error = EPFNOSUPPORT; 440 goto bad; 441 } 442 if (skip + hlen + ralen > maxpacketsize) { 443 IPCOMP_STATINC(IPCOMP_STAT_TOOBIG); 444 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 445 "(len %u, max len %u)\n", __func__, 446 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 447 (u_long) ntohl(sav->spi), 448 skip + hlen + ralen, maxpacketsize)); 449 error = EMSGSIZE; 450 goto bad; 451 } 452 453 /* Update the counters */ 454 IPCOMP_STATADD(IPCOMP_STAT_OBYTES, m->m_pkthdr.len - skip); 455 456 m = m_clone(m); 457 if (m == NULL) { 458 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 459 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 460 __func__, 461 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 462 (u_long) ntohl(sav->spi))); 463 error = ENOBUFS; 464 goto bad; 465 } 466 467 /* Ok now, we can pass to the crypto processing */ 468 469 /* Get crypto descriptors */ 470 crp = crypto_getreq(1); 471 if (crp == NULL) { 472 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 473 DPRINTF(("%s: failed to acquire crypto descriptor\n", 474 __func__)); 475 error = ENOBUFS; 476 goto bad; 477 } 478 crdc = crp->crp_desc; 479 480 /* Compression descriptor */ 481 crdc->crd_skip = skip; 482 crdc->crd_len = m->m_pkthdr.len - skip; 483 crdc->crd_flags = CRD_F_COMP; 484 crdc->crd_inject = skip; 485 486 /* Compression operation */ 487 crdc->crd_alg = ipcompx->type; 488 489 /* IPsec-specific opaque crypto info */ 490 tc = pool_get(&ipcomp_tdb_crypto_pool, PR_NOWAIT); 491 if (tc == NULL) { 492 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 493 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__)); 494 crypto_freereq(crp); 495 error = ENOBUFS; 496 goto bad; 497 } 498 499 { 500 int s = pserialize_read_enter(); 501 502 /* 503 * Take another reference to the SP and the SA for opencrypto callback. 504 */ 505 if (__predict_false(isr->sp->state == IPSEC_SPSTATE_DEAD || 506 sav->state == SADB_SASTATE_DEAD)) { 507 pserialize_read_exit(s); 508 pool_put(&ipcomp_tdb_crypto_pool, tc); 509 crypto_freereq(crp); 510 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 511 error = ENOENT; 512 goto bad; 513 } 514 KEY_SP_REF(isr->sp); 515 KEY_SA_REF(sav); 516 pserialize_read_exit(s); 517 } 518 519 tc->tc_isr = isr; 520 tc->tc_spi = sav->spi; 521 tc->tc_dst = sav->sah->saidx.dst; 522 tc->tc_proto = sav->sah->saidx.proto; 523 tc->tc_skip = skip; 524 tc->tc_protoff = protoff; 525 tc->tc_sav = sav; 526 527 /* Crypto operation descriptor */ 528 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 529 crp->crp_flags = CRYPTO_F_IMBUF; 530 crp->crp_buf = m; 531 crp->crp_callback = ipcomp_output_cb; 532 crp->crp_opaque = tc; 533 crp->crp_sid = sav->tdb_cryptoid; 534 535 return crypto_dispatch(crp); 536 bad: 537 if (m) 538 m_freem(m); 539 return (error); 540 } 541 542 /* 543 * IPComp output callback from the crypto driver. 544 */ 545 static int 546 ipcomp_output_cb(struct cryptop *crp) 547 { 548 char buf[IPSEC_ADDRSTRLEN]; 549 struct tdb_crypto *tc; 550 struct ipsecrequest *isr; 551 struct secasvar *sav; 552 struct mbuf *m, *mo; 553 int error, skip, rlen, roff; 554 uint8_t prot; 555 uint16_t cpi; 556 struct ipcomp * ipcomp; 557 IPSEC_DECLARE_LOCK_VARIABLE; 558 559 KASSERT(crp->crp_opaque != NULL); 560 tc = crp->crp_opaque; 561 m = crp->crp_buf; 562 skip = tc->tc_skip; 563 rlen = crp->crp_ilen - skip; 564 565 IPSEC_ACQUIRE_GLOBAL_LOCKS(); 566 567 isr = tc->tc_isr; 568 sav = tc->tc_sav; 569 if (__predict_false(isr->sp->state == IPSEC_SPSTATE_DEAD)) { 570 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 571 IPSECLOG(LOG_DEBUG, 572 "SP is being destroyed while in crypto (id=%u)\n", 573 isr->sp->id); 574 error = ENOENT; 575 goto bad; 576 } 577 if (__predict_false(!SADB_SASTATE_USABLE_P(sav))) { 578 KEY_SA_UNREF(&sav); 579 sav = KEY_LOOKUP_SA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, 0, 0); 580 if (sav == NULL) { 581 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 582 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 583 error = ENOBUFS; /*XXX*/ 584 goto bad; 585 } 586 } 587 588 /* Check for crypto errors */ 589 if (crp->crp_etype) { 590 /* Reset session ID */ 591 if (sav->tdb_cryptoid != 0) 592 sav->tdb_cryptoid = crp->crp_sid; 593 594 if (crp->crp_etype == EAGAIN) { 595 IPSEC_RELEASE_GLOBAL_LOCKS(); 596 return crypto_dispatch(crp); 597 } 598 IPCOMP_STATINC(IPCOMP_STAT_NOXFORM); 599 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 600 error = crp->crp_etype; 601 goto bad; 602 } 603 604 IPCOMP_STATINC(IPCOMP_STAT_HIST + ipcomp_stats[sav->alg_comp]); 605 606 if (rlen > crp->crp_olen) { 607 /* Inject IPCOMP header */ 608 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 609 if (mo == NULL) { 610 IPCOMP_STATINC(IPCOMP_STAT_WRAP); 611 DPRINTF(("%s: failed to inject IPCOMP header for " 612 "IPCA %s/%08lx\n", __func__, 613 ipsec_address(&sav->sah->saidx.dst, buf, 614 sizeof(buf)), (u_long) ntohl(sav->spi))); 615 error = ENOBUFS; 616 goto bad; 617 } 618 ipcomp = (struct ipcomp *)(mtod(mo, char *) + roff); 619 620 /* Initialize the IPCOMP header */ 621 /* XXX alignment always correct? */ 622 switch (sav->sah->saidx.dst.sa.sa_family) { 623 #ifdef INET 624 case AF_INET: 625 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 626 break; 627 #endif /* INET */ 628 #ifdef INET6 629 case AF_INET6: 630 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 631 break; 632 #endif 633 } 634 ipcomp->comp_flags = 0; 635 636 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0) 637 cpi = sav->alg_enc; 638 else 639 cpi = ntohl(sav->spi) & 0xffff; 640 ipcomp->comp_cpi = htons(cpi); 641 642 /* Fix Next Protocol in IPv4/IPv6 header */ 643 prot = IPPROTO_IPCOMP; 644 m_copyback(m, tc->tc_protoff, sizeof(uint8_t), (u_char *)&prot); 645 646 /* Adjust the length in the IP header */ 647 switch (sav->sah->saidx.dst.sa.sa_family) { 648 #ifdef INET 649 case AF_INET: 650 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 651 break; 652 #endif /* INET */ 653 #ifdef INET6 654 case AF_INET6: 655 mtod(m, struct ip6_hdr *)->ip6_plen = 656 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 657 break; 658 #endif /* INET6 */ 659 default: 660 IPCOMP_STATINC(IPCOMP_STAT_NOPF); 661 DPRINTF(("ipcomp_output: unknown/unsupported protocol " 662 "family %d, IPCA %s/%08lx\n", 663 sav->sah->saidx.dst.sa.sa_family, 664 ipsec_address(&sav->sah->saidx.dst, buf, 665 sizeof(buf)), (u_long) ntohl(sav->spi))); 666 error = EPFNOSUPPORT; 667 goto bad; 668 } 669 } else { 670 /* compression was useless, we have lost time */ 671 IPCOMP_STATINC(IPCOMP_STAT_USELESS); 672 DPRINTF(("ipcomp_output_cb: compression was useless : initial size was %d" 673 "and compressed size is %d\n", rlen, crp->crp_olen)); 674 } 675 676 677 /* Release the crypto descriptor */ 678 pool_put(&ipcomp_tdb_crypto_pool, tc); 679 crypto_freereq(crp); 680 681 /* NB: m is reclaimed by ipsec_process_done. */ 682 error = ipsec_process_done(m, isr, sav); 683 KEY_SA_UNREF(&sav); 684 KEY_SP_UNREF(&isr->sp); 685 IPSEC_RELEASE_GLOBAL_LOCKS(); 686 return error; 687 bad: 688 if (sav) 689 KEY_SA_UNREF(&sav); 690 KEY_SP_UNREF(&isr->sp); 691 IPSEC_RELEASE_GLOBAL_LOCKS(); 692 if (m) 693 m_freem(m); 694 pool_put(&ipcomp_tdb_crypto_pool, tc); 695 crypto_freereq(crp); 696 return error; 697 } 698 699 static struct xformsw ipcomp_xformsw = { 700 .xf_type = XF_IPCOMP, 701 .xf_flags = XFT_COMP, 702 .xf_name = "IPcomp", 703 .xf_init = ipcomp_init, 704 .xf_zeroize = ipcomp_zeroize, 705 .xf_input = ipcomp_input, 706 .xf_output = ipcomp_output, 707 .xf_next = NULL, 708 }; 709 710 void 711 ipcomp_attach(void) 712 { 713 ipcompstat_percpu = percpu_alloc(sizeof(uint64_t) * IPCOMP_NSTATS); 714 pool_init(&ipcomp_tdb_crypto_pool, sizeof(struct tdb_crypto), 715 0, 0, 0, "ipcomp_tdb_crypto", NULL, IPL_SOFTNET); 716 xform_register(&ipcomp_xformsw); 717 } 718
Indexes created Tue Sep 23 07:09:52 GMT 2025