xform_ipcomp.c revision 1.55
1 /* $NetBSD: xform_ipcomp.c,v 1.55 2018/02/14 09:13:03 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 1.55 2018/02/14 09:13:03 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 pool_cache_t ipcomp_tdb_crypto_pool_cache; 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, stat = IPCOMP_STAT_CRYPTO; 156 157 IPSEC_SPLASSERT_SOFTNET(__func__); 158 159 /* Get crypto descriptors */ 160 crp = crypto_getreq(1); 161 if (crp == NULL) { 162 DPRINTF(("%s: no crypto descriptors\n", __func__)); 163 error = ENOBUFS; 164 goto error_m; 165 } 166 /* Get IPsec-specific opaque pointer */ 167 tc = pool_cache_get(ipcomp_tdb_crypto_pool_cache, PR_NOWAIT); 168 if (tc == NULL) { 169 DPRINTF(("%s: cannot allocate tdb_crypto\n", __func__)); 170 error = ENOBUFS; 171 goto error_crp; 172 } 173 174 error = m_makewritable(&m, 0, m->m_pkthdr.len, M_NOWAIT); 175 if (error) { 176 DPRINTF(("%s: m_makewritable failed\n", __func__)); 177 goto error_tc; 178 } 179 180 { 181 int s = pserialize_read_enter(); 182 183 /* 184 * Take another reference to the SA for opencrypto callback. 185 */ 186 if (__predict_false(sav->state == SADB_SASTATE_DEAD)) { 187 pserialize_read_exit(s); 188 stat = IPCOMP_STAT_NOTDB; 189 error = ENOENT; 190 goto error_tc; 191 } 192 KEY_SA_REF(sav); 193 pserialize_read_exit(s); 194 } 195 196 crdc = crp->crp_desc; 197 198 crdc->crd_skip = skip + hlen; 199 crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 200 crdc->crd_inject = 0; /* unused */ 201 202 /* Decompression operation */ 203 crdc->crd_alg = sav->tdb_compalgxform->type; 204 205 /* Crypto operation descriptor */ 206 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 207 crp->crp_olen = MCLBYTES; /* hint to decompression code */ 208 crp->crp_flags = CRYPTO_F_IMBUF; 209 crp->crp_buf = m; 210 crp->crp_callback = ipcomp_input_cb; 211 crp->crp_sid = sav->tdb_cryptoid; 212 crp->crp_opaque = tc; 213 214 /* These are passed as-is to the callback */ 215 tc->tc_spi = sav->spi; 216 tc->tc_dst = sav->sah->saidx.dst; 217 tc->tc_proto = sav->sah->saidx.proto; 218 tc->tc_protoff = protoff; 219 tc->tc_skip = skip; 220 tc->tc_sav = sav; 221 222 return crypto_dispatch(crp); 223 224 error_tc: 225 pool_cache_put(ipcomp_tdb_crypto_pool_cache, tc); 226 error_crp: 227 crypto_freereq(crp); 228 error_m: 229 m_freem(m); 230 IPCOMP_STATINC(stat); 231 return error; 232 } 233 234 #ifdef INET6 235 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff) do { \ 236 if (saidx->dst.sa.sa_family == AF_INET6) { \ 237 error = ipsec6_common_input_cb(m, sav, skip, protoff); \ 238 } else { \ 239 error = ipsec4_common_input_cb(m, sav, skip, protoff); \ 240 } \ 241 } while (0) 242 #else 243 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff) \ 244 (error = ipsec4_common_input_cb(m, sav, skip, protoff)) 245 #endif 246 247 /* 248 * IPComp input callback from the crypto driver. 249 */ 250 static int 251 ipcomp_input_cb(struct cryptop *crp) 252 { 253 char buf[IPSEC_ADDRSTRLEN]; 254 struct tdb_crypto *tc; 255 int skip, protoff; 256 struct mbuf *m; 257 struct secasvar *sav; 258 struct secasindex *saidx __diagused; 259 int hlen = IPCOMP_HLENGTH, error, clen; 260 uint8_t nproto; 261 void *addr; 262 uint16_t dport; 263 uint16_t sport; 264 IPSEC_DECLARE_LOCK_VARIABLE; 265 266 KASSERT(crp->crp_opaque != NULL); 267 tc = crp->crp_opaque; 268 skip = tc->tc_skip; 269 protoff = tc->tc_protoff; 270 m = crp->crp_buf; 271 272 /* find the source port for NAT-T */ 273 nat_t_ports_get(m, &dport, &sport); 274 275 IPSEC_ACQUIRE_GLOBAL_LOCKS(); 276 277 sav = tc->tc_sav; 278 if (__predict_false(!SADB_SASTATE_USABLE_P(sav))) { 279 KEY_SA_UNREF(&sav); 280 sav = KEY_LOOKUP_SA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, 281 sport, dport); 282 if (sav == NULL) { 283 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 284 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 285 error = ENOBUFS; /*XXX*/ 286 goto bad; 287 } 288 } 289 290 saidx = &sav->sah->saidx; 291 KASSERTMSG(saidx->dst.sa.sa_family == AF_INET || 292 saidx->dst.sa.sa_family == AF_INET6, 293 "unexpected protocol family %u", saidx->dst.sa.sa_family); 294 295 /* Check for crypto errors */ 296 if (crp->crp_etype) { 297 /* Reset the session ID */ 298 if (sav->tdb_cryptoid != 0) 299 sav->tdb_cryptoid = crp->crp_sid; 300 301 if (crp->crp_etype == EAGAIN) { 302 KEY_SA_UNREF(&sav); 303 IPSEC_RELEASE_GLOBAL_LOCKS(); 304 return crypto_dispatch(crp); 305 } 306 307 IPCOMP_STATINC(IPCOMP_STAT_NOXFORM); 308 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 309 error = crp->crp_etype; 310 goto bad; 311 } 312 313 IPCOMP_STATINC(IPCOMP_STAT_HIST + ipcomp_stats[sav->alg_comp]); 314 315 /* Update the counters */ 316 IPCOMP_STATADD(IPCOMP_STAT_IBYTES, m->m_pkthdr.len - skip - hlen); 317 318 319 clen = crp->crp_olen; /* Length of data after processing */ 320 321 /* Release the crypto descriptors */ 322 pool_cache_put(ipcomp_tdb_crypto_pool_cache, tc); 323 tc = NULL; 324 crypto_freereq(crp), crp = NULL; 325 326 /* In case it's not done already, adjust the size of the mbuf chain */ 327 m->m_pkthdr.len = clen + hlen + skip; 328 329 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { 330 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); /*XXX*/ 331 DPRINTF(("%s: m_pullup failed\n", __func__)); 332 error = EINVAL; /*XXX*/ 333 goto bad; 334 } 335 336 /* Keep the next protocol field */ 337 addr = (uint8_t*) mtod(m, struct ip *) + skip; 338 nproto = ((struct ipcomp *) addr)->comp_nxt; 339 switch (nproto) { 340 case IPPROTO_IPCOMP: 341 case IPPROTO_AH: 342 case IPPROTO_ESP: 343 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 344 DPRINTF(("%s: nested ipcomp, IPCA %s/%08lx\n", __func__, 345 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 346 (u_long) ntohl(sav->spi))); 347 error = EINVAL; 348 goto bad; 349 default: 350 break; 351 } 352 353 /* Remove the IPCOMP header */ 354 error = m_striphdr(m, skip, hlen); 355 if (error) { 356 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 357 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 358 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 359 (u_long) ntohl(sav->spi))); 360 goto bad; 361 } 362 363 /* Restore the Next Protocol field */ 364 m_copyback(m, protoff, sizeof(uint8_t), (uint8_t *) &nproto); 365 366 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff); 367 368 KEY_SA_UNREF(&sav); 369 IPSEC_RELEASE_GLOBAL_LOCKS(); 370 return error; 371 bad: 372 if (sav) 373 KEY_SA_UNREF(&sav); 374 IPSEC_RELEASE_GLOBAL_LOCKS(); 375 if (m) 376 m_freem(m); 377 if (tc != NULL) 378 pool_cache_put(ipcomp_tdb_crypto_pool_cache, tc); 379 if (crp) 380 crypto_freereq(crp); 381 return error; 382 } 383 384 /* 385 * IPComp output routine, called by ipsec[46]_process_packet() 386 */ 387 static int 388 ipcomp_output( 389 struct mbuf *m, 390 const struct ipsecrequest *isr, 391 struct secasvar *sav, 392 struct mbuf **mp, 393 int skip, 394 int protoff 395 ) 396 { 397 char buf[IPSEC_ADDRSTRLEN]; 398 const struct comp_algo *ipcompx; 399 int error, ralen, hlen, maxpacketsize; 400 struct cryptodesc *crdc; 401 struct cryptop *crp; 402 struct tdb_crypto *tc; 403 404 IPSEC_SPLASSERT_SOFTNET(__func__); 405 KASSERT(sav != NULL); 406 KASSERT(sav->tdb_compalgxform != NULL); 407 ipcompx = sav->tdb_compalgxform; 408 409 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 410 411 /* Don't process the packet if it is too short */ 412 if (ralen < ipcompx->minlen) { 413 IPCOMP_STATINC(IPCOMP_STAT_MINLEN); 414 return ipsec_process_done(m, isr, sav); 415 } 416 417 hlen = IPCOMP_HLENGTH; 418 419 IPCOMP_STATINC(IPCOMP_STAT_OUTPUT); 420 421 /* Check for maximum packet size violations. */ 422 switch (sav->sah->saidx.dst.sa.sa_family) { 423 #ifdef INET 424 case AF_INET: 425 maxpacketsize = IP_MAXPACKET; 426 break; 427 #endif /* INET */ 428 #ifdef INET6 429 case AF_INET6: 430 maxpacketsize = IPV6_MAXPACKET; 431 break; 432 #endif /* INET6 */ 433 default: 434 IPCOMP_STATINC(IPCOMP_STAT_NOPF); 435 DPRINTF(("%s: unknown/unsupported protocol family %d" 436 ", IPCA %s/%08lx\n", __func__, 437 sav->sah->saidx.dst.sa.sa_family, 438 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 439 (u_long) ntohl(sav->spi))); 440 error = EPFNOSUPPORT; 441 goto bad; 442 } 443 if (skip + hlen + ralen > maxpacketsize) { 444 IPCOMP_STATINC(IPCOMP_STAT_TOOBIG); 445 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 446 "(len %u, max len %u)\n", __func__, 447 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 448 (u_long) ntohl(sav->spi), 449 skip + hlen + ralen, maxpacketsize)); 450 error = EMSGSIZE; 451 goto bad; 452 } 453 454 /* Update the counters */ 455 IPCOMP_STATADD(IPCOMP_STAT_OBYTES, m->m_pkthdr.len - skip); 456 457 m = m_clone(m); 458 if (m == NULL) { 459 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 460 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 461 __func__, 462 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 463 (u_long) ntohl(sav->spi))); 464 error = ENOBUFS; 465 goto bad; 466 } 467 468 /* Ok now, we can pass to the crypto processing */ 469 470 /* Get crypto descriptors */ 471 crp = crypto_getreq(1); 472 if (crp == NULL) { 473 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 474 DPRINTF(("%s: failed to acquire crypto descriptor\n", 475 __func__)); 476 error = ENOBUFS; 477 goto bad; 478 } 479 crdc = crp->crp_desc; 480 481 /* Compression descriptor */ 482 crdc->crd_skip = skip; 483 crdc->crd_len = m->m_pkthdr.len - skip; 484 crdc->crd_flags = CRD_F_COMP; 485 crdc->crd_inject = skip; 486 487 /* Compression operation */ 488 crdc->crd_alg = ipcompx->type; 489 490 /* IPsec-specific opaque crypto info */ 491 tc = pool_cache_get(ipcomp_tdb_crypto_pool_cache, PR_NOWAIT); 492 if (tc == NULL) { 493 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 494 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__)); 495 crypto_freereq(crp); 496 error = ENOBUFS; 497 goto bad; 498 } 499 500 { 501 int s = pserialize_read_enter(); 502 503 /* 504 * Take another reference to the SP and the SA for opencrypto callback. 505 */ 506 if (__predict_false(isr->sp->state == IPSEC_SPSTATE_DEAD || 507 sav->state == SADB_SASTATE_DEAD)) { 508 pserialize_read_exit(s); 509 pool_cache_put(ipcomp_tdb_crypto_pool_cache, tc); 510 crypto_freereq(crp); 511 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 512 error = ENOENT; 513 goto bad; 514 } 515 KEY_SP_REF(isr->sp); 516 KEY_SA_REF(sav); 517 pserialize_read_exit(s); 518 } 519 520 tc->tc_isr = isr; 521 tc->tc_spi = sav->spi; 522 tc->tc_dst = sav->sah->saidx.dst; 523 tc->tc_proto = sav->sah->saidx.proto; 524 tc->tc_skip = skip; 525 tc->tc_protoff = protoff; 526 tc->tc_sav = sav; 527 528 /* Crypto operation descriptor */ 529 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 530 crp->crp_flags = CRYPTO_F_IMBUF; 531 crp->crp_buf = m; 532 crp->crp_callback = ipcomp_output_cb; 533 crp->crp_opaque = tc; 534 crp->crp_sid = sav->tdb_cryptoid; 535 536 return crypto_dispatch(crp); 537 bad: 538 if (m) 539 m_freem(m); 540 return (error); 541 } 542 543 /* 544 * IPComp output callback from the crypto driver. 545 */ 546 static int 547 ipcomp_output_cb(struct cryptop *crp) 548 { 549 char buf[IPSEC_ADDRSTRLEN]; 550 struct tdb_crypto *tc; 551 const struct ipsecrequest *isr; 552 struct secasvar *sav; 553 struct mbuf *m, *mo; 554 int error, skip, rlen, roff; 555 uint8_t prot; 556 uint16_t cpi; 557 struct ipcomp * ipcomp; 558 IPSEC_DECLARE_LOCK_VARIABLE; 559 560 KASSERT(crp->crp_opaque != NULL); 561 tc = crp->crp_opaque; 562 m = crp->crp_buf; 563 skip = tc->tc_skip; 564 rlen = crp->crp_ilen - skip; 565 566 IPSEC_ACQUIRE_GLOBAL_LOCKS(); 567 568 isr = tc->tc_isr; 569 sav = tc->tc_sav; 570 if (__predict_false(isr->sp->state == IPSEC_SPSTATE_DEAD)) { 571 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 572 IPSECLOG(LOG_DEBUG, 573 "SP is being destroyed while in crypto (id=%u)\n", 574 isr->sp->id); 575 error = ENOENT; 576 goto bad; 577 } 578 if (__predict_false(!SADB_SASTATE_USABLE_P(sav))) { 579 KEY_SA_UNREF(&sav); 580 sav = KEY_LOOKUP_SA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, 0, 0); 581 if (sav == NULL) { 582 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 583 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 584 error = ENOBUFS; /*XXX*/ 585 goto bad; 586 } 587 } 588 589 /* Check for crypto errors */ 590 if (crp->crp_etype) { 591 /* Reset session ID */ 592 if (sav->tdb_cryptoid != 0) 593 sav->tdb_cryptoid = crp->crp_sid; 594 595 if (crp->crp_etype == EAGAIN) { 596 IPSEC_RELEASE_GLOBAL_LOCKS(); 597 return crypto_dispatch(crp); 598 } 599 IPCOMP_STATINC(IPCOMP_STAT_NOXFORM); 600 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 601 error = crp->crp_etype; 602 goto bad; 603 } 604 605 IPCOMP_STATINC(IPCOMP_STAT_HIST + ipcomp_stats[sav->alg_comp]); 606 607 if (rlen > crp->crp_olen) { 608 /* Inject IPCOMP header */ 609 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 610 if (mo == NULL) { 611 IPCOMP_STATINC(IPCOMP_STAT_WRAP); 612 DPRINTF(("%s: failed to inject IPCOMP header for " 613 "IPCA %s/%08lx\n", __func__, 614 ipsec_address(&sav->sah->saidx.dst, buf, 615 sizeof(buf)), (u_long) ntohl(sav->spi))); 616 error = ENOBUFS; 617 goto bad; 618 } 619 ipcomp = (struct ipcomp *)(mtod(mo, char *) + roff); 620 621 /* Initialize the IPCOMP header */ 622 /* XXX alignment always correct? */ 623 switch (sav->sah->saidx.dst.sa.sa_family) { 624 #ifdef INET 625 case AF_INET: 626 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 627 break; 628 #endif /* INET */ 629 #ifdef INET6 630 case AF_INET6: 631 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 632 break; 633 #endif 634 } 635 ipcomp->comp_flags = 0; 636 637 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0) 638 cpi = sav->alg_enc; 639 else 640 cpi = ntohl(sav->spi) & 0xffff; 641 ipcomp->comp_cpi = htons(cpi); 642 643 /* Fix Next Protocol in IPv4/IPv6 header */ 644 prot = IPPROTO_IPCOMP; 645 m_copyback(m, tc->tc_protoff, sizeof(uint8_t), (u_char *)&prot); 646 647 /* Adjust the length in the IP header */ 648 switch (sav->sah->saidx.dst.sa.sa_family) { 649 #ifdef INET 650 case AF_INET: 651 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 652 break; 653 #endif /* INET */ 654 #ifdef INET6 655 case AF_INET6: 656 mtod(m, struct ip6_hdr *)->ip6_plen = 657 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 658 break; 659 #endif /* INET6 */ 660 default: 661 IPCOMP_STATINC(IPCOMP_STAT_NOPF); 662 DPRINTF(("ipcomp_output: unknown/unsupported protocol " 663 "family %d, IPCA %s/%08lx\n", 664 sav->sah->saidx.dst.sa.sa_family, 665 ipsec_address(&sav->sah->saidx.dst, buf, 666 sizeof(buf)), (u_long) ntohl(sav->spi))); 667 error = EPFNOSUPPORT; 668 goto bad; 669 } 670 } else { 671 /* compression was useless, we have lost time */ 672 IPCOMP_STATINC(IPCOMP_STAT_USELESS); 673 DPRINTF(("ipcomp_output_cb: compression was useless : initial size was %d" 674 "and compressed size is %d\n", rlen, crp->crp_olen)); 675 } 676 677 678 /* Release the crypto descriptor */ 679 pool_cache_put(ipcomp_tdb_crypto_pool_cache, tc); 680 crypto_freereq(crp); 681 682 /* NB: m is reclaimed by ipsec_process_done. */ 683 error = ipsec_process_done(m, isr, sav); 684 KEY_SA_UNREF(&sav); 685 KEY_SP_UNREF(&isr->sp); 686 IPSEC_RELEASE_GLOBAL_LOCKS(); 687 return error; 688 bad: 689 if (sav) 690 KEY_SA_UNREF(&sav); 691 KEY_SP_UNREF(&isr->sp); 692 IPSEC_RELEASE_GLOBAL_LOCKS(); 693 if (m) 694 m_freem(m); 695 pool_cache_put(ipcomp_tdb_crypto_pool_cache, tc); 696 crypto_freereq(crp); 697 return error; 698 } 699 700 static struct xformsw ipcomp_xformsw = { 701 .xf_type = XF_IPCOMP, 702 .xf_flags = XFT_COMP, 703 .xf_name = "IPcomp", 704 .xf_init = ipcomp_init, 705 .xf_zeroize = ipcomp_zeroize, 706 .xf_input = ipcomp_input, 707 .xf_output = ipcomp_output, 708 .xf_next = NULL, 709 }; 710 711 void 712 ipcomp_attach(void) 713 { 714 ipcompstat_percpu = percpu_alloc(sizeof(uint64_t) * IPCOMP_NSTATS); 715 ipcomp_tdb_crypto_pool_cache = pool_cache_init(sizeof(struct tdb_crypto), 716 coherency_unit, 0, 0, "ipcomp_tdb_crypto", NULL, IPL_SOFTNET, 717 NULL, NULL, NULL); 718 xform_register(&ipcomp_xformsw); 719 } 720
Indexes created Wed Sep 24 05:09:52 GMT 2025