xform_ipcomp.c revision 1.50
1 /* $NetBSD: xform_ipcomp.c,v 1.50 2017/08/03 06:32:51 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 1.50 2017/08/03 06:32:51 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 crdc = crp->crp_desc; 188 189 crdc->crd_skip = skip + hlen; 190 crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 191 crdc->crd_inject = 0; /* unused */ 192 193 /* Decompression operation */ 194 crdc->crd_alg = sav->tdb_compalgxform->type; 195 196 /* Crypto operation descriptor */ 197 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 198 crp->crp_olen = MCLBYTES; /* hint to decompression code */ 199 crp->crp_flags = CRYPTO_F_IMBUF; 200 crp->crp_buf = m; 201 crp->crp_callback = ipcomp_input_cb; 202 crp->crp_sid = sav->tdb_cryptoid; 203 crp->crp_opaque = tc; 204 205 /* These are passed as-is to the callback */ 206 tc->tc_spi = sav->spi; 207 tc->tc_dst = sav->sah->saidx.dst; 208 tc->tc_proto = sav->sah->saidx.proto; 209 tc->tc_protoff = protoff; 210 tc->tc_skip = skip; 211 tc->tc_sav = sav; 212 KEY_SA_REF(sav); 213 214 return crypto_dispatch(crp); 215 } 216 217 #ifdef INET6 218 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff) do { \ 219 if (saidx->dst.sa.sa_family == AF_INET6) { \ 220 error = ipsec6_common_input_cb(m, sav, skip, protoff); \ 221 } else { \ 222 error = ipsec4_common_input_cb(m, sav, skip, protoff); \ 223 } \ 224 } while (0) 225 #else 226 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff) \ 227 (error = ipsec4_common_input_cb(m, sav, skip, protoff)) 228 #endif 229 230 /* 231 * IPComp input callback from the crypto driver. 232 */ 233 static int 234 ipcomp_input_cb(struct cryptop *crp) 235 { 236 char buf[IPSEC_ADDRSTRLEN]; 237 struct tdb_crypto *tc; 238 int skip, protoff; 239 struct mbuf *m; 240 struct secasvar *sav; 241 struct secasindex *saidx __diagused; 242 int hlen = IPCOMP_HLENGTH, error, clen; 243 uint8_t nproto; 244 void *addr; 245 uint16_t dport; 246 uint16_t sport; 247 IPSEC_DECLARE_LOCK_VARIABLE; 248 249 KASSERT(crp->crp_opaque != NULL); 250 tc = crp->crp_opaque; 251 skip = tc->tc_skip; 252 protoff = tc->tc_protoff; 253 m = crp->crp_buf; 254 255 /* find the source port for NAT-T */ 256 nat_t_ports_get(m, &dport, &sport); 257 258 IPSEC_ACQUIRE_GLOBAL_LOCKS(); 259 260 sav = tc->tc_sav; 261 if (__predict_false(!SADB_SASTATE_USABLE_P(sav))) { 262 KEY_SA_UNREF(&sav); 263 sav = KEY_LOOKUP_SA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, 264 sport, dport); 265 if (sav == NULL) { 266 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 267 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 268 error = ENOBUFS; /*XXX*/ 269 goto bad; 270 } 271 } 272 273 saidx = &sav->sah->saidx; 274 KASSERTMSG(saidx->dst.sa.sa_family == AF_INET || 275 saidx->dst.sa.sa_family == AF_INET6, 276 "unexpected protocol family %u", saidx->dst.sa.sa_family); 277 278 /* Check for crypto errors */ 279 if (crp->crp_etype) { 280 /* Reset the session ID */ 281 if (sav->tdb_cryptoid != 0) 282 sav->tdb_cryptoid = crp->crp_sid; 283 284 if (crp->crp_etype == EAGAIN) { 285 KEY_SA_UNREF(&sav); 286 IPSEC_RELEASE_GLOBAL_LOCKS(); 287 return crypto_dispatch(crp); 288 } 289 290 IPCOMP_STATINC(IPCOMP_STAT_NOXFORM); 291 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 292 error = crp->crp_etype; 293 goto bad; 294 } 295 296 IPCOMP_STATINC(IPCOMP_STAT_HIST + ipcomp_stats[sav->alg_comp]); 297 298 /* Update the counters */ 299 IPCOMP_STATADD(IPCOMP_STAT_IBYTES, m->m_pkthdr.len - skip - hlen); 300 301 302 clen = crp->crp_olen; /* Length of data after processing */ 303 304 /* Release the crypto descriptors */ 305 pool_put(&ipcomp_tdb_crypto_pool, tc); 306 tc = NULL; 307 crypto_freereq(crp), crp = NULL; 308 309 /* In case it's not done already, adjust the size of the mbuf chain */ 310 m->m_pkthdr.len = clen + hlen + skip; 311 312 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { 313 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); /*XXX*/ 314 DPRINTF(("%s: m_pullup failed\n", __func__)); 315 error = EINVAL; /*XXX*/ 316 goto bad; 317 } 318 319 /* Keep the next protocol field */ 320 addr = (uint8_t*) mtod(m, struct ip *) + skip; 321 nproto = ((struct ipcomp *) addr)->comp_nxt; 322 switch (nproto) { 323 case IPPROTO_IPCOMP: 324 case IPPROTO_AH: 325 case IPPROTO_ESP: 326 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 327 DPRINTF(("%s: nested ipcomp, IPCA %s/%08lx\n", __func__, 328 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 329 (u_long) ntohl(sav->spi))); 330 error = EINVAL; 331 goto bad; 332 default: 333 break; 334 } 335 336 /* Remove the IPCOMP header */ 337 error = m_striphdr(m, skip, hlen); 338 if (error) { 339 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 340 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 341 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 342 (u_long) ntohl(sav->spi))); 343 goto bad; 344 } 345 346 /* Restore the Next Protocol field */ 347 m_copyback(m, protoff, sizeof(uint8_t), (uint8_t *) &nproto); 348 349 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff); 350 351 KEY_SA_UNREF(&sav); 352 IPSEC_RELEASE_GLOBAL_LOCKS(); 353 return error; 354 bad: 355 if (sav) 356 KEY_SA_UNREF(&sav); 357 IPSEC_RELEASE_GLOBAL_LOCKS(); 358 if (m) 359 m_freem(m); 360 if (tc != NULL) 361 pool_put(&ipcomp_tdb_crypto_pool, tc); 362 if (crp) 363 crypto_freereq(crp); 364 return error; 365 } 366 367 /* 368 * IPComp output routine, called by ipsec[46]_process_packet() 369 */ 370 static int 371 ipcomp_output( 372 struct mbuf *m, 373 struct ipsecrequest *isr, 374 struct secasvar *sav, 375 struct mbuf **mp, 376 int skip, 377 int protoff 378 ) 379 { 380 char buf[IPSEC_ADDRSTRLEN]; 381 const struct comp_algo *ipcompx; 382 int error, ralen, hlen, maxpacketsize; 383 struct cryptodesc *crdc; 384 struct cryptop *crp; 385 struct tdb_crypto *tc; 386 387 IPSEC_SPLASSERT_SOFTNET(__func__); 388 KASSERT(sav != NULL); 389 KASSERT(sav->tdb_compalgxform != NULL); 390 ipcompx = sav->tdb_compalgxform; 391 392 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 393 394 /* Don't process the packet if it is too short */ 395 if (ralen < ipcompx->minlen) { 396 IPCOMP_STATINC(IPCOMP_STAT_MINLEN); 397 return ipsec_process_done(m, isr, sav); 398 } 399 400 hlen = IPCOMP_HLENGTH; 401 402 IPCOMP_STATINC(IPCOMP_STAT_OUTPUT); 403 404 /* Check for maximum packet size violations. */ 405 switch (sav->sah->saidx.dst.sa.sa_family) { 406 #ifdef INET 407 case AF_INET: 408 maxpacketsize = IP_MAXPACKET; 409 break; 410 #endif /* INET */ 411 #ifdef INET6 412 case AF_INET6: 413 maxpacketsize = IPV6_MAXPACKET; 414 break; 415 #endif /* INET6 */ 416 default: 417 IPCOMP_STATINC(IPCOMP_STAT_NOPF); 418 DPRINTF(("%s: unknown/unsupported protocol family %d" 419 ", IPCA %s/%08lx\n", __func__, 420 sav->sah->saidx.dst.sa.sa_family, 421 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 422 (u_long) ntohl(sav->spi))); 423 error = EPFNOSUPPORT; 424 goto bad; 425 } 426 if (skip + hlen + ralen > maxpacketsize) { 427 IPCOMP_STATINC(IPCOMP_STAT_TOOBIG); 428 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 429 "(len %u, max len %u)\n", __func__, 430 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 431 (u_long) ntohl(sav->spi), 432 skip + hlen + ralen, maxpacketsize)); 433 error = EMSGSIZE; 434 goto bad; 435 } 436 437 /* Update the counters */ 438 IPCOMP_STATADD(IPCOMP_STAT_OBYTES, m->m_pkthdr.len - skip); 439 440 m = m_clone(m); 441 if (m == NULL) { 442 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 443 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 444 __func__, 445 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 446 (u_long) ntohl(sav->spi))); 447 error = ENOBUFS; 448 goto bad; 449 } 450 451 /* Ok now, we can pass to the crypto processing */ 452 453 /* Get crypto descriptors */ 454 crp = crypto_getreq(1); 455 if (crp == NULL) { 456 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 457 DPRINTF(("%s: failed to acquire crypto descriptor\n", 458 __func__)); 459 error = ENOBUFS; 460 goto bad; 461 } 462 crdc = crp->crp_desc; 463 464 /* Compression descriptor */ 465 crdc->crd_skip = skip; 466 crdc->crd_len = m->m_pkthdr.len - skip; 467 crdc->crd_flags = CRD_F_COMP; 468 crdc->crd_inject = skip; 469 470 /* Compression operation */ 471 crdc->crd_alg = ipcompx->type; 472 473 /* IPsec-specific opaque crypto info */ 474 tc = pool_get(&ipcomp_tdb_crypto_pool, PR_NOWAIT); 475 if (tc == NULL) { 476 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 477 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__)); 478 crypto_freereq(crp); 479 error = ENOBUFS; 480 goto bad; 481 } 482 483 { 484 int s = pserialize_read_enter(); 485 486 if (__predict_false(isr->sp->state == IPSEC_SPSTATE_DEAD)) { 487 pserialize_read_exit(s); 488 pool_put(&ipcomp_tdb_crypto_pool, tc); 489 crypto_freereq(crp); 490 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 491 error = ENOENT; 492 goto bad; 493 } 494 KEY_SP_REF(isr->sp); 495 pserialize_read_exit(s); 496 } 497 498 tc->tc_isr = isr; 499 tc->tc_spi = sav->spi; 500 tc->tc_dst = sav->sah->saidx.dst; 501 tc->tc_proto = sav->sah->saidx.proto; 502 tc->tc_skip = skip; 503 tc->tc_protoff = protoff; 504 tc->tc_sav = sav; 505 KEY_SA_REF(sav); 506 507 /* Crypto operation descriptor */ 508 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 509 crp->crp_flags = CRYPTO_F_IMBUF; 510 crp->crp_buf = m; 511 crp->crp_callback = ipcomp_output_cb; 512 crp->crp_opaque = tc; 513 crp->crp_sid = sav->tdb_cryptoid; 514 515 return crypto_dispatch(crp); 516 bad: 517 if (m) 518 m_freem(m); 519 return (error); 520 } 521 522 /* 523 * IPComp output callback from the crypto driver. 524 */ 525 static int 526 ipcomp_output_cb(struct cryptop *crp) 527 { 528 char buf[IPSEC_ADDRSTRLEN]; 529 struct tdb_crypto *tc; 530 struct ipsecrequest *isr; 531 struct secasvar *sav; 532 struct mbuf *m, *mo; 533 int error, skip, rlen, roff; 534 uint8_t prot; 535 uint16_t cpi; 536 struct ipcomp * ipcomp; 537 IPSEC_DECLARE_LOCK_VARIABLE; 538 539 KASSERT(crp->crp_opaque != NULL); 540 tc = crp->crp_opaque; 541 m = crp->crp_buf; 542 skip = tc->tc_skip; 543 rlen = crp->crp_ilen - skip; 544 545 IPSEC_ACQUIRE_GLOBAL_LOCKS(); 546 547 isr = tc->tc_isr; 548 sav = tc->tc_sav; 549 if (__predict_false(isr->sp->state == IPSEC_SPSTATE_DEAD)) { 550 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 551 IPSECLOG(LOG_DEBUG, 552 "SP is being destroyed while in crypto (id=%u)\n", 553 isr->sp->id); 554 error = ENOENT; 555 goto bad; 556 } 557 if (__predict_false(!SADB_SASTATE_USABLE_P(sav))) { 558 KEY_SA_UNREF(&sav); 559 sav = KEY_LOOKUP_SA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, 0, 0); 560 if (sav == NULL) { 561 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 562 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 563 error = ENOBUFS; /*XXX*/ 564 goto bad; 565 } 566 } 567 568 /* Check for crypto errors */ 569 if (crp->crp_etype) { 570 /* Reset session ID */ 571 if (sav->tdb_cryptoid != 0) 572 sav->tdb_cryptoid = crp->crp_sid; 573 574 if (crp->crp_etype == EAGAIN) { 575 IPSEC_RELEASE_GLOBAL_LOCKS(); 576 return crypto_dispatch(crp); 577 } 578 IPCOMP_STATINC(IPCOMP_STAT_NOXFORM); 579 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 580 error = crp->crp_etype; 581 goto bad; 582 } 583 584 IPCOMP_STATINC(IPCOMP_STAT_HIST + ipcomp_stats[sav->alg_comp]); 585 586 if (rlen > crp->crp_olen) { 587 /* Inject IPCOMP header */ 588 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 589 if (mo == NULL) { 590 IPCOMP_STATINC(IPCOMP_STAT_WRAP); 591 DPRINTF(("%s: failed to inject IPCOMP header for " 592 "IPCA %s/%08lx\n", __func__, 593 ipsec_address(&sav->sah->saidx.dst, buf, 594 sizeof(buf)), (u_long) ntohl(sav->spi))); 595 error = ENOBUFS; 596 goto bad; 597 } 598 ipcomp = (struct ipcomp *)(mtod(mo, char *) + roff); 599 600 /* Initialize the IPCOMP header */ 601 /* XXX alignment always correct? */ 602 switch (sav->sah->saidx.dst.sa.sa_family) { 603 #ifdef INET 604 case AF_INET: 605 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 606 break; 607 #endif /* INET */ 608 #ifdef INET6 609 case AF_INET6: 610 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 611 break; 612 #endif 613 } 614 ipcomp->comp_flags = 0; 615 616 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0) 617 cpi = sav->alg_enc; 618 else 619 cpi = ntohl(sav->spi) & 0xffff; 620 ipcomp->comp_cpi = htons(cpi); 621 622 /* Fix Next Protocol in IPv4/IPv6 header */ 623 prot = IPPROTO_IPCOMP; 624 m_copyback(m, tc->tc_protoff, sizeof(uint8_t), (u_char *)&prot); 625 626 /* Adjust the length in the IP header */ 627 switch (sav->sah->saidx.dst.sa.sa_family) { 628 #ifdef INET 629 case AF_INET: 630 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 631 break; 632 #endif /* INET */ 633 #ifdef INET6 634 case AF_INET6: 635 mtod(m, struct ip6_hdr *)->ip6_plen = 636 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 637 break; 638 #endif /* INET6 */ 639 default: 640 IPCOMP_STATINC(IPCOMP_STAT_NOPF); 641 DPRINTF(("ipcomp_output: unknown/unsupported protocol " 642 "family %d, IPCA %s/%08lx\n", 643 sav->sah->saidx.dst.sa.sa_family, 644 ipsec_address(&sav->sah->saidx.dst, buf, 645 sizeof(buf)), (u_long) ntohl(sav->spi))); 646 error = EPFNOSUPPORT; 647 goto bad; 648 } 649 } else { 650 /* compression was useless, we have lost time */ 651 IPCOMP_STATINC(IPCOMP_STAT_USELESS); 652 DPRINTF(("ipcomp_output_cb: compression was useless : initial size was %d" 653 "and compressed size is %d\n", rlen, crp->crp_olen)); 654 } 655 656 657 /* Release the crypto descriptor */ 658 pool_put(&ipcomp_tdb_crypto_pool, tc); 659 crypto_freereq(crp); 660 661 /* NB: m is reclaimed by ipsec_process_done. */ 662 error = ipsec_process_done(m, isr, sav); 663 KEY_SA_UNREF(&sav); 664 KEY_SP_UNREF(&isr->sp); 665 IPSEC_RELEASE_GLOBAL_LOCKS(); 666 return error; 667 bad: 668 if (sav) 669 KEY_SA_UNREF(&sav); 670 KEY_SP_UNREF(&isr->sp); 671 IPSEC_RELEASE_GLOBAL_LOCKS(); 672 if (m) 673 m_freem(m); 674 pool_put(&ipcomp_tdb_crypto_pool, tc); 675 crypto_freereq(crp); 676 return error; 677 } 678 679 static struct xformsw ipcomp_xformsw = { 680 .xf_type = XF_IPCOMP, 681 .xf_flags = XFT_COMP, 682 .xf_name = "IPcomp", 683 .xf_init = ipcomp_init, 684 .xf_zeroize = ipcomp_zeroize, 685 .xf_input = ipcomp_input, 686 .xf_output = ipcomp_output, 687 .xf_next = NULL, 688 }; 689 690 void 691 ipcomp_attach(void) 692 { 693 ipcompstat_percpu = percpu_alloc(sizeof(uint64_t) * IPCOMP_NSTATS); 694 pool_init(&ipcomp_tdb_crypto_pool, sizeof(struct tdb_crypto), 695 0, 0, 0, "ipcomp_tdb_crypto", NULL, IPL_SOFTNET); 696 xform_register(&ipcomp_xformsw); 697 } 698
Indexes created Tue Sep 23 22:09:46 GMT 2025