xform_ipcomp.c revision 1.29.6.1
1 /* $NetBSD: xform_ipcomp.c,v 1.29.6.1 2013/06/23 06:20:26 tls 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 1.29.6.1 2013/06/23 06:20:26 tls Exp $"); 34 35 /* IP payload compression protocol (IPComp), see RFC 2393 */ 36 #include "opt_inet.h" 37 #ifdef __FreeBSD__ 38 #include "opt_inet6.h" 39 #endif 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/mbuf.h> 44 #include <sys/socket.h> 45 #include <sys/kernel.h> 46 #include <sys/protosw.h> 47 #include <sys/sysctl.h> 48 #include <sys/socketvar.h> /* for softnet_lock */ 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 <netipsec/ipsec_osdep.h> 72 73 #include <opencrypto/cryptodev.h> 74 #include <opencrypto/deflate.h> 75 #include <opencrypto/xform.h> 76 77 percpu_t *ipcompstat_percpu; 78 79 int ipcomp_enable = 1; 80 81 #ifdef __FreeBSD__ 82 SYSCTL_DECL(_net_inet_ipcomp); 83 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, 84 ipcomp_enable, CTLFLAG_RW, &ipcomp_enable, 0, ""); 85 SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS, 86 stats, CTLFLAG_RD, &ipcompstat, ipcompstat, ""); 87 #endif /* __FreeBSD__ */ 88 89 static int ipcomp_input_cb(struct cryptop *crp); 90 static int ipcomp_output_cb(struct cryptop *crp); 91 92 const struct comp_algo * 93 ipcomp_algorithm_lookup(int alg) 94 { 95 if (alg >= IPCOMP_ALG_MAX) 96 return NULL; 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(("ipcomp_init: unsupported compression algorithm %d\n", 118 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, const 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("ipcomp_input"); 158 159 /* Get crypto descriptors */ 160 crp = crypto_getreq(1); 161 if (crp == NULL) { 162 m_freem(m); 163 DPRINTF(("ipcomp_input: no crypto descriptors\n")); 164 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 165 return ENOBUFS; 166 } 167 /* Get IPsec-specific opaque pointer */ 168 tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO); 169 if (tc == NULL) { 170 m_freem(m); 171 crypto_freereq(crp); 172 DPRINTF(("ipcomp_input: cannot allocate tdb_crypto\n")); 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(("ipcomp_input: m_makewritable failed\n")); 180 m_freem(m); 181 free(tc, M_XDATA); 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 tc->tc_ptr = 0; 194 195 /* Decompression operation */ 196 crdc->crd_alg = sav->tdb_compalgxform->type; 197 198 /* Crypto operation descriptor */ 199 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 200 crp->crp_olen = MCLBYTES; /* hint to decompression code */ 201 crp->crp_flags = CRYPTO_F_IMBUF; 202 crp->crp_buf = m; 203 crp->crp_callback = ipcomp_input_cb; 204 crp->crp_sid = sav->tdb_cryptoid; 205 crp->crp_opaque = tc; 206 207 /* These are passed as-is to the callback */ 208 tc->tc_spi = sav->spi; 209 tc->tc_dst = sav->sah->saidx.dst; 210 tc->tc_proto = sav->sah->saidx.proto; 211 tc->tc_protoff = protoff; 212 tc->tc_skip = skip; 213 214 return crypto_dispatch(crp); 215 } 216 217 #ifdef INET6 218 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \ 219 if (saidx->dst.sa.sa_family == AF_INET6) { \ 220 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \ 221 } else { \ 222 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \ 223 } \ 224 } while (0) 225 #else 226 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \ 227 (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag)) 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 struct cryptodesc *crd; 237 struct tdb_crypto *tc; 238 int skip, protoff; 239 struct mtag *mtag; 240 struct mbuf *m; 241 struct secasvar *sav; 242 struct secasindex *saidx; 243 int s, hlen = IPCOMP_HLENGTH, error, clen; 244 u_int8_t nproto; 245 void *addr; 246 u_int16_t dport; 247 u_int16_t sport; 248 249 crd = crp->crp_desc; 250 251 tc = (struct tdb_crypto *) crp->crp_opaque; 252 IPSEC_ASSERT(tc != NULL, ("ipcomp_input_cb: null opaque crypto data area!")); 253 skip = tc->tc_skip; 254 protoff = tc->tc_protoff; 255 mtag = (struct mtag *) tc->tc_ptr; 256 m = (struct mbuf *) crp->crp_buf; 257 258 /* find the source port for NAT-T */ 259 nat_t_ports_get(m, &dport, &sport); 260 261 s = splsoftnet(); 262 mutex_enter(softnet_lock); 263 264 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, sport, dport); 265 if (sav == NULL) { 266 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 267 DPRINTF(("ipcomp_input_cb: SA expired while in crypto\n")); 268 error = ENOBUFS; /*XXX*/ 269 goto bad; 270 } 271 272 saidx = &sav->sah->saidx; 273 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 274 saidx->dst.sa.sa_family == AF_INET6, 275 ("ipcomp_input_cb: unexpected protocol family %u", 276 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(("ipcomp_input_cb: crypto error %d\n", crp->crp_etype)); 293 error = crp->crp_etype; 294 goto bad; 295 } 296 /* Shouldn't happen... */ 297 if (m == NULL) { 298 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 299 DPRINTF(("ipcomp_input_cb: null mbuf returned from crypto\n")); 300 error = EINVAL; 301 goto bad; 302 } 303 IPCOMP_STATINC(IPCOMP_STAT_HIST + sav->alg_comp); 304 305 /* Update the counters */ 306 IPCOMP_STATADD(IPCOMP_STAT_IBYTES, m->m_pkthdr.len - skip - hlen); 307 308 309 clen = crp->crp_olen; /* Length of data after processing */ 310 311 /* Release the crypto descriptors */ 312 free(tc, M_XDATA), tc = NULL; 313 crypto_freereq(crp), crp = NULL; 314 315 /* In case it's not done already, adjust the size of the mbuf chain */ 316 m->m_pkthdr.len = clen + hlen + skip; 317 318 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { 319 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); /*XXX*/ 320 DPRINTF(("ipcomp_input_cb: m_pullup failed\n")); 321 error = EINVAL; /*XXX*/ 322 goto bad; 323 } 324 325 /* Keep the next protocol field */ 326 addr = (uint8_t*) mtod(m, struct ip *) + skip; 327 nproto = ((struct ipcomp *) addr)->comp_nxt; 328 if (nproto == IPPROTO_IPCOMP || nproto == IPPROTO_AH || nproto == IPPROTO_ESP) { 329 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 330 DPRINTF(("ipcomp_input_cb: nested ipcomp, IPCA %s/%08lx\n", 331 ipsec_address(&sav->sah->saidx.dst), 332 (u_long) ntohl(sav->spi))); 333 error = EINVAL; 334 goto bad; 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(("ipcomp_input_cb: bad mbuf chain, IPCA %s/%08lx\n", 342 ipsec_address(&sav->sah->saidx.dst), 343 (u_long) ntohl(sav->spi))); 344 goto bad; 345 } 346 347 /* Restore the Next Protocol field */ 348 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 349 350 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL); 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 free(tc, M_XDATA); 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 mbuf **mp, 378 int skip, 379 int protoff 380 ) 381 { 382 const struct secasvar *sav; 383 const struct comp_algo *ipcompx; 384 int error, ralen, hlen, maxpacketsize; 385 struct cryptodesc *crdc; 386 struct cryptop *crp; 387 struct tdb_crypto *tc; 388 389 IPSEC_SPLASSERT_SOFTNET("ipcomp_output"); 390 sav = isr->sav; 391 IPSEC_ASSERT(sav != NULL, ("ipcomp_output: null SA")); 392 ipcompx = sav->tdb_compalgxform; 393 IPSEC_ASSERT(ipcompx != NULL, ("ipcomp_output: null compression xform")); 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); 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(("ipcomp_output: unknown/unsupported protocol family %d" 422 ", IPCA %s/%08lx\n", 423 sav->sah->saidx.dst.sa.sa_family, 424 ipsec_address(&sav->sah->saidx.dst), 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(("ipcomp_output: packet in IPCA %s/%08lx got too big " 432 "(len %u, max len %u)\n", 433 ipsec_address(&sav->sah->saidx.dst), 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(("ipcomp_output: cannot clone mbuf chain, IPCA %s/%08lx\n", 447 ipsec_address(&sav->sah->saidx.dst), 448 (u_long) ntohl(sav->spi))); 449 error = ENOBUFS; 450 goto bad; 451 } 452 453 /* Ok now, we can pass to the crypto processing */ 454 455 /* Get crypto descriptors */ 456 crp = crypto_getreq(1); 457 if (crp == NULL) { 458 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 459 DPRINTF(("ipcomp_output: failed to acquire crypto descriptor\n")); 460 error = ENOBUFS; 461 goto bad; 462 } 463 crdc = crp->crp_desc; 464 465 /* Compression descriptor */ 466 crdc->crd_skip = skip; 467 crdc->crd_len = m->m_pkthdr.len - skip; 468 crdc->crd_flags = CRD_F_COMP; 469 crdc->crd_inject = skip; 470 471 /* Compression operation */ 472 crdc->crd_alg = ipcompx->type; 473 474 /* IPsec-specific opaque crypto info */ 475 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto), 476 M_XDATA, M_NOWAIT|M_ZERO); 477 if (tc == NULL) { 478 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 479 DPRINTF(("ipcomp_output: failed to allocate tdb_crypto\n")); 480 crypto_freereq(crp); 481 error = ENOBUFS; 482 goto bad; 483 } 484 485 tc->tc_isr = isr; 486 tc->tc_spi = sav->spi; 487 tc->tc_dst = sav->sah->saidx.dst; 488 tc->tc_proto = sav->sah->saidx.proto; 489 tc->tc_skip = skip; 490 tc->tc_protoff = protoff; 491 492 /* Crypto operation descriptor */ 493 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 494 crp->crp_flags = CRYPTO_F_IMBUF; 495 crp->crp_buf = m; 496 crp->crp_callback = ipcomp_output_cb; 497 crp->crp_opaque = tc; 498 crp->crp_sid = sav->tdb_cryptoid; 499 500 return crypto_dispatch(crp); 501 bad: 502 if (m) 503 m_freem(m); 504 return (error); 505 } 506 507 /* 508 * IPComp output callback from the crypto driver. 509 */ 510 static int 511 ipcomp_output_cb(struct cryptop *crp) 512 { 513 struct tdb_crypto *tc; 514 struct ipsecrequest *isr; 515 struct secasvar *sav; 516 struct mbuf *m, *mo; 517 int s, error, skip, rlen, roff; 518 u_int8_t prot; 519 u_int16_t cpi; 520 struct ipcomp * ipcomp; 521 522 523 tc = (struct tdb_crypto *) crp->crp_opaque; 524 IPSEC_ASSERT(tc != NULL, ("ipcomp_output_cb: null opaque data area!")); 525 m = (struct mbuf *) crp->crp_buf; 526 skip = tc->tc_skip; 527 rlen = crp->crp_ilen - skip; 528 529 s = splsoftnet(); 530 mutex_enter(softnet_lock); 531 532 isr = tc->tc_isr; 533 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, 0, 0); 534 if (sav == NULL) { 535 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 536 DPRINTF(("ipcomp_output_cb: SA expired while in crypto\n")); 537 error = ENOBUFS; /*XXX*/ 538 goto bad; 539 } 540 IPSEC_ASSERT(isr->sav == sav, ("ipcomp_output_cb: SA changed\n")); 541 542 /* Check for crypto errors */ 543 if (crp->crp_etype) { 544 /* Reset session ID */ 545 if (sav->tdb_cryptoid != 0) 546 sav->tdb_cryptoid = crp->crp_sid; 547 548 if (crp->crp_etype == EAGAIN) { 549 KEY_FREESAV(&sav); 550 mutex_exit(softnet_lock); 551 splx(s); 552 return crypto_dispatch(crp); 553 } 554 IPCOMP_STATINC(IPCOMP_STAT_NOXFORM); 555 DPRINTF(("ipcomp_output_cb: crypto error %d\n", crp->crp_etype)); 556 error = crp->crp_etype; 557 goto bad; 558 } 559 /* Shouldn't happen... */ 560 if (m == NULL) { 561 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 562 DPRINTF(("ipcomp_output_cb: bogus return buffer from crypto\n")); 563 error = EINVAL; 564 goto bad; 565 } 566 IPCOMP_STATINC(IPCOMP_STAT_HIST + sav->alg_comp); 567 568 if (rlen > crp->crp_olen) { 569 /* Inject IPCOMP header */ 570 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 571 if (mo == NULL) { 572 IPCOMP_STATINC(IPCOMP_STAT_WRAP); 573 DPRINTF(("ipcomp_output: failed to inject IPCOMP header for " 574 "IPCA %s/%08lx\n", 575 ipsec_address(&sav->sah->saidx.dst), 576 (u_long) ntohl(sav->spi))); 577 error = ENOBUFS; 578 goto bad; 579 } 580 ipcomp = (struct ipcomp *)(mtod(mo, char *) + roff); 581 582 /* Initialize the IPCOMP header */ 583 /* XXX alignment always correct? */ 584 switch (sav->sah->saidx.dst.sa.sa_family) { 585 #ifdef INET 586 case AF_INET: 587 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 588 break; 589 #endif /* INET */ 590 #ifdef INET6 591 case AF_INET6: 592 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 593 break; 594 #endif 595 } 596 ipcomp->comp_flags = 0; 597 598 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0) 599 cpi = sav->alg_enc; 600 else 601 cpi = ntohl(sav->spi) & 0xffff; 602 ipcomp->comp_cpi = htons(cpi); 603 604 /* Fix Next Protocol in IPv4/IPv6 header */ 605 prot = IPPROTO_IPCOMP; 606 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t), (u_char *)&prot); 607 608 /* Adjust the length in the IP header */ 609 switch (sav->sah->saidx.dst.sa.sa_family) { 610 #ifdef INET 611 case AF_INET: 612 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 613 break; 614 #endif /* INET */ 615 #ifdef INET6 616 case AF_INET6: 617 mtod(m, struct ip6_hdr *)->ip6_plen = 618 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 619 break; 620 #endif /* INET6 */ 621 default: 622 IPCOMP_STATINC(IPCOMP_STAT_NOPF); 623 DPRINTF(("ipcomp_output: unknown/unsupported protocol " 624 "family %d, IPCA %s/%08lx\n", 625 sav->sah->saidx.dst.sa.sa_family, 626 ipsec_address(&sav->sah->saidx.dst), 627 (u_long) ntohl(sav->spi))); 628 error = EPFNOSUPPORT; 629 goto bad; 630 } 631 } else { 632 /* compression was useless, we have lost time */ 633 IPCOMP_STATINC(IPCOMP_STAT_USELESS); 634 DPRINTF(("ipcomp_output_cb: compression was useless : initial size was %d" 635 "and compressed size is %d\n", rlen, crp->crp_olen)); 636 } 637 638 639 /* Release the crypto descriptor */ 640 free(tc, M_XDATA); 641 crypto_freereq(crp); 642 643 /* NB: m is reclaimed by ipsec_process_done. */ 644 error = ipsec_process_done(m, isr); 645 KEY_FREESAV(&sav); 646 mutex_exit(softnet_lock); 647 splx(s); 648 return error; 649 bad: 650 if (sav) 651 KEY_FREESAV(&sav); 652 mutex_exit(softnet_lock); 653 splx(s); 654 if (m) 655 m_freem(m); 656 free(tc, M_XDATA); 657 crypto_freereq(crp); 658 return error; 659 } 660 661 static struct xformsw ipcomp_xformsw = { 662 XF_IPCOMP, XFT_COMP, "IPcomp", 663 ipcomp_init, ipcomp_zeroize, ipcomp_input, 664 ipcomp_output, 665 NULL, 666 }; 667 668 INITFN void 669 ipcomp_attach(void) 670 { 671 ipcompstat_percpu = percpu_alloc(sizeof(uint64_t) * IPCOMP_NSTATS); 672 xform_register(&ipcomp_xformsw); 673 } 674 675 #ifdef __FreeBSD__ 676 SYSINIT(ipcomp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipcomp_attach, NULL) 677 #endif /* __FreeBSD__ */ 678
Indexes created Tue Sep 30 20:09:53 GMT 2025