xform_ipcomp.c revision 1.47
1 /* $NetBSD: xform_ipcomp.c,v 1.47 2017/07/20 08:07:14 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 1.47 2017/07/20 08:07:14 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/socketvar.h> /* for softnet_lock */ 48 #include <sys/pool.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 s, hlen = IPCOMP_HLENGTH, error, clen; 243 uint8_t nproto; 244 void *addr; 245 uint16_t dport; 246 uint16_t sport; 247 248 KASSERT(crp->crp_opaque != NULL); 249 tc = crp->crp_opaque; 250 skip = tc->tc_skip; 251 protoff = tc->tc_protoff; 252 m = crp->crp_buf; 253 254 /* find the source port for NAT-T */ 255 nat_t_ports_get(m, &dport, &sport); 256 257 s = splsoftnet(); 258 mutex_enter(softnet_lock); 259 260 sav = tc->tc_sav; 261 if (__predict_false(!SADB_SASTATE_USABLE_P(sav))) { 262 KEY_FREESAV(&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_FREESAV(&sav); 286 mutex_exit(softnet_lock); 287 splx(s); 288 return crypto_dispatch(crp); 289 } 290 291 IPCOMP_STATINC(IPCOMP_STAT_NOXFORM); 292 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 293 error = crp->crp_etype; 294 goto bad; 295 } 296 297 IPCOMP_STATINC(IPCOMP_STAT_HIST + ipcomp_stats[sav->alg_comp]); 298 299 /* Update the counters */ 300 IPCOMP_STATADD(IPCOMP_STAT_IBYTES, m->m_pkthdr.len - skip - hlen); 301 302 303 clen = crp->crp_olen; /* Length of data after processing */ 304 305 /* Release the crypto descriptors */ 306 pool_put(&ipcomp_tdb_crypto_pool, tc); 307 tc = NULL; 308 crypto_freereq(crp), crp = NULL; 309 310 /* In case it's not done already, adjust the size of the mbuf chain */ 311 m->m_pkthdr.len = clen + hlen + skip; 312 313 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { 314 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); /*XXX*/ 315 DPRINTF(("%s: m_pullup failed\n", __func__)); 316 error = EINVAL; /*XXX*/ 317 goto bad; 318 } 319 320 /* Keep the next protocol field */ 321 addr = (uint8_t*) mtod(m, struct ip *) + skip; 322 nproto = ((struct ipcomp *) addr)->comp_nxt; 323 switch (nproto) { 324 case IPPROTO_IPCOMP: 325 case IPPROTO_AH: 326 case IPPROTO_ESP: 327 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 328 DPRINTF(("%s: nested ipcomp, IPCA %s/%08lx\n", __func__, 329 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 330 (u_long) ntohl(sav->spi))); 331 error = EINVAL; 332 goto bad; 333 default: 334 break; 335 } 336 337 /* Remove the IPCOMP header */ 338 error = m_striphdr(m, skip, hlen); 339 if (error) { 340 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 341 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 342 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 343 (u_long) ntohl(sav->spi))); 344 goto bad; 345 } 346 347 /* Restore the Next Protocol field */ 348 m_copyback(m, protoff, sizeof(uint8_t), (uint8_t *) &nproto); 349 350 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff); 351 352 KEY_FREESAV(&sav); 353 mutex_exit(softnet_lock); 354 splx(s); 355 return error; 356 bad: 357 if (sav) 358 KEY_FREESAV(&sav); 359 mutex_exit(softnet_lock); 360 splx(s); 361 if (m) 362 m_freem(m); 363 if (tc != NULL) 364 pool_put(&ipcomp_tdb_crypto_pool, tc); 365 if (crp) 366 crypto_freereq(crp); 367 return error; 368 } 369 370 /* 371 * IPComp output routine, called by ipsec[46]_process_packet() 372 */ 373 static int 374 ipcomp_output( 375 struct mbuf *m, 376 struct ipsecrequest *isr, 377 struct secasvar *sav, 378 struct mbuf **mp, 379 int skip, 380 int protoff 381 ) 382 { 383 char buf[IPSEC_ADDRSTRLEN]; 384 const struct comp_algo *ipcompx; 385 int error, ralen, hlen, maxpacketsize; 386 struct cryptodesc *crdc; 387 struct cryptop *crp; 388 struct tdb_crypto *tc; 389 390 IPSEC_SPLASSERT_SOFTNET(__func__); 391 KASSERT(sav != NULL); 392 KASSERT(sav->tdb_compalgxform != NULL); 393 ipcompx = sav->tdb_compalgxform; 394 395 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 396 397 /* Don't process the packet if it is too short */ 398 if (ralen < ipcompx->minlen) { 399 IPCOMP_STATINC(IPCOMP_STAT_MINLEN); 400 return ipsec_process_done(m, isr, sav); 401 } 402 403 hlen = IPCOMP_HLENGTH; 404 405 IPCOMP_STATINC(IPCOMP_STAT_OUTPUT); 406 407 /* Check for maximum packet size violations. */ 408 switch (sav->sah->saidx.dst.sa.sa_family) { 409 #ifdef INET 410 case AF_INET: 411 maxpacketsize = IP_MAXPACKET; 412 break; 413 #endif /* INET */ 414 #ifdef INET6 415 case AF_INET6: 416 maxpacketsize = IPV6_MAXPACKET; 417 break; 418 #endif /* INET6 */ 419 default: 420 IPCOMP_STATINC(IPCOMP_STAT_NOPF); 421 DPRINTF(("%s: unknown/unsupported protocol family %d" 422 ", IPCA %s/%08lx\n", __func__, 423 sav->sah->saidx.dst.sa.sa_family, 424 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 425 (u_long) ntohl(sav->spi))); 426 error = EPFNOSUPPORT; 427 goto bad; 428 } 429 if (skip + hlen + ralen > maxpacketsize) { 430 IPCOMP_STATINC(IPCOMP_STAT_TOOBIG); 431 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 432 "(len %u, max len %u)\n", __func__, 433 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 434 (u_long) ntohl(sav->spi), 435 skip + hlen + ralen, maxpacketsize)); 436 error = EMSGSIZE; 437 goto bad; 438 } 439 440 /* Update the counters */ 441 IPCOMP_STATADD(IPCOMP_STAT_OBYTES, m->m_pkthdr.len - skip); 442 443 m = m_clone(m); 444 if (m == NULL) { 445 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 446 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 447 __func__, 448 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 449 (u_long) ntohl(sav->spi))); 450 error = ENOBUFS; 451 goto bad; 452 } 453 454 /* Ok now, we can pass to the crypto processing */ 455 456 /* Get crypto descriptors */ 457 crp = crypto_getreq(1); 458 if (crp == NULL) { 459 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 460 DPRINTF(("%s: failed to acquire crypto descriptor\n", 461 __func__)); 462 error = ENOBUFS; 463 goto bad; 464 } 465 crdc = crp->crp_desc; 466 467 /* Compression descriptor */ 468 crdc->crd_skip = skip; 469 crdc->crd_len = m->m_pkthdr.len - skip; 470 crdc->crd_flags = CRD_F_COMP; 471 crdc->crd_inject = skip; 472 473 /* Compression operation */ 474 crdc->crd_alg = ipcompx->type; 475 476 /* IPsec-specific opaque crypto info */ 477 tc = pool_get(&ipcomp_tdb_crypto_pool, PR_NOWAIT); 478 if (tc == NULL) { 479 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 480 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__)); 481 crypto_freereq(crp); 482 error = ENOBUFS; 483 goto bad; 484 } 485 486 tc->tc_isr = isr; 487 KEY_SP_REF(isr->sp); 488 tc->tc_spi = sav->spi; 489 tc->tc_dst = sav->sah->saidx.dst; 490 tc->tc_proto = sav->sah->saidx.proto; 491 tc->tc_skip = skip; 492 tc->tc_protoff = protoff; 493 tc->tc_sav = sav; 494 KEY_SA_REF(sav); 495 496 /* Crypto operation descriptor */ 497 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 498 crp->crp_flags = CRYPTO_F_IMBUF; 499 crp->crp_buf = m; 500 crp->crp_callback = ipcomp_output_cb; 501 crp->crp_opaque = tc; 502 crp->crp_sid = sav->tdb_cryptoid; 503 504 return crypto_dispatch(crp); 505 bad: 506 if (m) 507 m_freem(m); 508 return (error); 509 } 510 511 /* 512 * IPComp output callback from the crypto driver. 513 */ 514 static int 515 ipcomp_output_cb(struct cryptop *crp) 516 { 517 char buf[IPSEC_ADDRSTRLEN]; 518 struct tdb_crypto *tc; 519 struct ipsecrequest *isr; 520 struct secasvar *sav; 521 struct mbuf *m, *mo; 522 int s, error, skip, rlen, roff; 523 uint8_t prot; 524 uint16_t cpi; 525 struct ipcomp * ipcomp; 526 527 KASSERT(crp->crp_opaque != NULL); 528 tc = crp->crp_opaque; 529 m = crp->crp_buf; 530 skip = tc->tc_skip; 531 rlen = crp->crp_ilen - skip; 532 533 s = splsoftnet(); 534 mutex_enter(softnet_lock); 535 536 isr = tc->tc_isr; 537 sav = tc->tc_sav; 538 if (__predict_false(isr->sp->state == IPSEC_SPSTATE_DEAD)) { 539 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 540 IPSECLOG(LOG_DEBUG, 541 "SP is being destroyed while in crypto (id=%u)\n", 542 isr->sp->id); 543 error = ENOENT; 544 goto bad; 545 } 546 if (__predict_false(!SADB_SASTATE_USABLE_P(sav))) { 547 KEY_FREESAV(&sav); 548 sav = KEY_LOOKUP_SA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, 0, 0); 549 if (sav == NULL) { 550 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 551 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 552 error = ENOBUFS; /*XXX*/ 553 goto bad; 554 } 555 } 556 557 /* Check for crypto errors */ 558 if (crp->crp_etype) { 559 /* Reset session ID */ 560 if (sav->tdb_cryptoid != 0) 561 sav->tdb_cryptoid = crp->crp_sid; 562 563 if (crp->crp_etype == EAGAIN) { 564 mutex_exit(softnet_lock); 565 splx(s); 566 return crypto_dispatch(crp); 567 } 568 IPCOMP_STATINC(IPCOMP_STAT_NOXFORM); 569 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 570 error = crp->crp_etype; 571 goto bad; 572 } 573 574 IPCOMP_STATINC(IPCOMP_STAT_HIST + ipcomp_stats[sav->alg_comp]); 575 576 if (rlen > crp->crp_olen) { 577 /* Inject IPCOMP header */ 578 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 579 if (mo == NULL) { 580 IPCOMP_STATINC(IPCOMP_STAT_WRAP); 581 DPRINTF(("%s: failed to inject IPCOMP header for " 582 "IPCA %s/%08lx\n", __func__, 583 ipsec_address(&sav->sah->saidx.dst, buf, 584 sizeof(buf)), (u_long) ntohl(sav->spi))); 585 error = ENOBUFS; 586 goto bad; 587 } 588 ipcomp = (struct ipcomp *)(mtod(mo, char *) + roff); 589 590 /* Initialize the IPCOMP header */ 591 /* XXX alignment always correct? */ 592 switch (sav->sah->saidx.dst.sa.sa_family) { 593 #ifdef INET 594 case AF_INET: 595 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 596 break; 597 #endif /* INET */ 598 #ifdef INET6 599 case AF_INET6: 600 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 601 break; 602 #endif 603 } 604 ipcomp->comp_flags = 0; 605 606 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0) 607 cpi = sav->alg_enc; 608 else 609 cpi = ntohl(sav->spi) & 0xffff; 610 ipcomp->comp_cpi = htons(cpi); 611 612 /* Fix Next Protocol in IPv4/IPv6 header */ 613 prot = IPPROTO_IPCOMP; 614 m_copyback(m, tc->tc_protoff, sizeof(uint8_t), (u_char *)&prot); 615 616 /* Adjust the length in the IP header */ 617 switch (sav->sah->saidx.dst.sa.sa_family) { 618 #ifdef INET 619 case AF_INET: 620 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 621 break; 622 #endif /* INET */ 623 #ifdef INET6 624 case AF_INET6: 625 mtod(m, struct ip6_hdr *)->ip6_plen = 626 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 627 break; 628 #endif /* INET6 */ 629 default: 630 IPCOMP_STATINC(IPCOMP_STAT_NOPF); 631 DPRINTF(("ipcomp_output: unknown/unsupported protocol " 632 "family %d, IPCA %s/%08lx\n", 633 sav->sah->saidx.dst.sa.sa_family, 634 ipsec_address(&sav->sah->saidx.dst, buf, 635 sizeof(buf)), (u_long) ntohl(sav->spi))); 636 error = EPFNOSUPPORT; 637 goto bad; 638 } 639 } else { 640 /* compression was useless, we have lost time */ 641 IPCOMP_STATINC(IPCOMP_STAT_USELESS); 642 DPRINTF(("ipcomp_output_cb: compression was useless : initial size was %d" 643 "and compressed size is %d\n", rlen, crp->crp_olen)); 644 } 645 646 647 /* Release the crypto descriptor */ 648 pool_put(&ipcomp_tdb_crypto_pool, tc); 649 crypto_freereq(crp); 650 651 /* NB: m is reclaimed by ipsec_process_done. */ 652 error = ipsec_process_done(m, isr, sav); 653 KEY_FREESAV(&sav); 654 KEY_FREESP(&isr->sp); 655 mutex_exit(softnet_lock); 656 splx(s); 657 return error; 658 bad: 659 if (sav) 660 KEY_FREESAV(&sav); 661 KEY_FREESP(&isr->sp); 662 mutex_exit(softnet_lock); 663 splx(s); 664 if (m) 665 m_freem(m); 666 pool_put(&ipcomp_tdb_crypto_pool, tc); 667 crypto_freereq(crp); 668 return error; 669 } 670 671 static struct xformsw ipcomp_xformsw = { 672 .xf_type = XF_IPCOMP, 673 .xf_flags = XFT_COMP, 674 .xf_name = "IPcomp", 675 .xf_init = ipcomp_init, 676 .xf_zeroize = ipcomp_zeroize, 677 .xf_input = ipcomp_input, 678 .xf_output = ipcomp_output, 679 .xf_next = NULL, 680 }; 681 682 void 683 ipcomp_attach(void) 684 { 685 ipcompstat_percpu = percpu_alloc(sizeof(uint64_t) * IPCOMP_NSTATS); 686 pool_init(&ipcomp_tdb_crypto_pool, sizeof(struct tdb_crypto), 687 0, 0, 0, "ipcomp_tdb_crypto", NULL, IPL_SOFTNET); 688 xform_register(&ipcomp_xformsw); 689 } 690
Indexes created Tue Sep 23 14:10:03 GMT 2025