xform_ipcomp.c revision 1.42
1 /* $NetBSD: xform_ipcomp.c,v 1.42 2017/07/14 01:24:23 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 1.42 2017/07/14 01:24:23 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 49 #include <netinet/in.h> 50 #include <netinet/in_systm.h> 51 #include <netinet/ip.h> 52 #include <netinet/ip_var.h> 53 54 #include <net/route.h> 55 #include <netipsec/ipsec.h> 56 #include <netipsec/ipsec_private.h> 57 #include <netipsec/xform.h> 58 59 #ifdef INET6 60 #include <netinet/ip6.h> 61 #include <netipsec/ipsec6.h> 62 #endif 63 64 #include <netipsec/ipcomp.h> 65 #include <netipsec/ipcomp_var.h> 66 67 #include <netipsec/key.h> 68 #include <netipsec/key_debug.h> 69 70 #include <opencrypto/cryptodev.h> 71 #include <opencrypto/deflate.h> 72 #include <opencrypto/xform.h> 73 74 percpu_t *ipcompstat_percpu; 75 76 int ipcomp_enable = 1; 77 78 #ifdef __FreeBSD__ 79 SYSCTL_DECL(_net_inet_ipcomp); 80 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, 81 ipcomp_enable, CTLFLAG_RW, &ipcomp_enable, 0, ""); 82 SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS, 83 stats, CTLFLAG_RD, &ipcompstat, ipcompstat, ""); 84 #endif /* __FreeBSD__ */ 85 86 static int ipcomp_input_cb(struct cryptop *crp); 87 static int ipcomp_output_cb(struct cryptop *crp); 88 89 const uint8_t ipcomp_stats[256] = { SADB_CALG_STATS_INIT }; 90 91 const struct comp_algo * 92 ipcomp_algorithm_lookup(int alg) 93 { 94 switch (alg) { 95 case SADB_X_CALG_DEFLATE: 96 return &comp_algo_deflate_nogrow; 97 } 98 return NULL; 99 } 100 101 /* 102 * ipcomp_init() is called when an CPI is being set up. 103 */ 104 static int 105 ipcomp_init(struct secasvar *sav, const struct xformsw *xsp) 106 { 107 const struct comp_algo *tcomp; 108 struct cryptoini cric; 109 int ses; 110 111 /* NB: algorithm really comes in alg_enc and not alg_comp! */ 112 tcomp = ipcomp_algorithm_lookup(sav->alg_enc); 113 if (tcomp == NULL) { 114 DPRINTF(("%s: unsupported compression algorithm %d\n", 115 __func__, sav->alg_comp)); 116 return EINVAL; 117 } 118 sav->alg_comp = sav->alg_enc; /* set for doing histogram */ 119 sav->tdb_xform = xsp; 120 sav->tdb_compalgxform = tcomp; 121 122 /* Initialize crypto session */ 123 memset(&cric, 0, sizeof(cric)); 124 cric.cri_alg = sav->tdb_compalgxform->type; 125 126 ses = crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support); 127 return ses; 128 } 129 130 /* 131 * ipcomp_zeroize() used when IPCA is deleted 132 */ 133 static int 134 ipcomp_zeroize(struct secasvar *sav) 135 { 136 int err; 137 138 err = crypto_freesession(sav->tdb_cryptoid); 139 sav->tdb_cryptoid = 0; 140 return err; 141 } 142 143 /* 144 * ipcomp_input() gets called to uncompress an input packet 145 */ 146 static int 147 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 148 { 149 struct tdb_crypto *tc; 150 struct cryptodesc *crdc; 151 struct cryptop *crp; 152 int error, hlen = IPCOMP_HLENGTH; 153 154 IPSEC_SPLASSERT_SOFTNET(__func__); 155 156 /* Get crypto descriptors */ 157 crp = crypto_getreq(1); 158 if (crp == NULL) { 159 m_freem(m); 160 DPRINTF(("%s: no crypto descriptors\n", __func__)); 161 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 162 return ENOBUFS; 163 } 164 /* Get IPsec-specific opaque pointer */ 165 tc = malloc(sizeof(*tc), M_XDATA, M_NOWAIT|M_ZERO); 166 if (tc == NULL) { 167 m_freem(m); 168 crypto_freereq(crp); 169 DPRINTF(("%s: cannot allocate tdb_crypto\n", __func__)); 170 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 171 return ENOBUFS; 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 m_freem(m); 178 free(tc, M_XDATA); 179 crypto_freereq(crp); 180 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 181 return error; 182 } 183 184 crdc = crp->crp_desc; 185 186 crdc->crd_skip = skip + hlen; 187 crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 188 crdc->crd_inject = 0; /* unused */ 189 190 /* Decompression operation */ 191 crdc->crd_alg = sav->tdb_compalgxform->type; 192 193 /* Crypto operation descriptor */ 194 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 195 crp->crp_olen = MCLBYTES; /* hint to decompression code */ 196 crp->crp_flags = CRYPTO_F_IMBUF; 197 crp->crp_buf = m; 198 crp->crp_callback = ipcomp_input_cb; 199 crp->crp_sid = sav->tdb_cryptoid; 200 crp->crp_opaque = tc; 201 202 /* These are passed as-is to the callback */ 203 tc->tc_spi = sav->spi; 204 tc->tc_dst = sav->sah->saidx.dst; 205 tc->tc_proto = sav->sah->saidx.proto; 206 tc->tc_protoff = protoff; 207 tc->tc_skip = skip; 208 tc->tc_sav = sav; 209 KEY_SA_REF(sav); 210 211 return crypto_dispatch(crp); 212 } 213 214 #ifdef INET6 215 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff) do { \ 216 if (saidx->dst.sa.sa_family == AF_INET6) { \ 217 error = ipsec6_common_input_cb(m, sav, skip, protoff); \ 218 } else { \ 219 error = ipsec4_common_input_cb(m, sav, skip, protoff); \ 220 } \ 221 } while (0) 222 #else 223 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff) \ 224 (error = ipsec4_common_input_cb(m, sav, skip, protoff)) 225 #endif 226 227 /* 228 * IPComp input callback from the crypto driver. 229 */ 230 static int 231 ipcomp_input_cb(struct cryptop *crp) 232 { 233 char buf[IPSEC_ADDRSTRLEN]; 234 struct tdb_crypto *tc; 235 int skip, protoff; 236 struct mbuf *m; 237 struct secasvar *sav; 238 struct secasindex *saidx __diagused; 239 int s, hlen = IPCOMP_HLENGTH, error, clen; 240 uint8_t nproto; 241 void *addr; 242 uint16_t dport; 243 uint16_t sport; 244 245 KASSERT(crp->crp_opaque != NULL); 246 tc = crp->crp_opaque; 247 skip = tc->tc_skip; 248 protoff = tc->tc_protoff; 249 m = crp->crp_buf; 250 251 /* find the source port for NAT-T */ 252 nat_t_ports_get(m, &dport, &sport); 253 254 s = splsoftnet(); 255 mutex_enter(softnet_lock); 256 257 sav = tc->tc_sav; 258 if (__predict_false(!SADB_SASTATE_USABLE_P(sav))) { 259 KEY_FREESAV(&sav); 260 sav = KEY_LOOKUP_SA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, 261 sport, dport); 262 if (sav == NULL) { 263 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 264 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 265 error = ENOBUFS; /*XXX*/ 266 goto bad; 267 } 268 } 269 270 saidx = &sav->sah->saidx; 271 KASSERTMSG(saidx->dst.sa.sa_family == AF_INET || 272 saidx->dst.sa.sa_family == AF_INET6, 273 "unexpected protocol family %u", saidx->dst.sa.sa_family); 274 275 /* Check for crypto errors */ 276 if (crp->crp_etype) { 277 /* Reset the session ID */ 278 if (sav->tdb_cryptoid != 0) 279 sav->tdb_cryptoid = crp->crp_sid; 280 281 if (crp->crp_etype == EAGAIN) { 282 KEY_FREESAV(&sav); 283 mutex_exit(softnet_lock); 284 splx(s); 285 return crypto_dispatch(crp); 286 } 287 288 IPCOMP_STATINC(IPCOMP_STAT_NOXFORM); 289 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 290 error = crp->crp_etype; 291 goto bad; 292 } 293 /* Shouldn't happen... */ 294 if (m == NULL) { 295 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 296 DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 297 error = EINVAL; 298 goto bad; 299 } 300 IPCOMP_STATINC(IPCOMP_STAT_HIST + ipcomp_stats[sav->alg_comp]); 301 302 /* Update the counters */ 303 IPCOMP_STATADD(IPCOMP_STAT_IBYTES, m->m_pkthdr.len - skip - hlen); 304 305 306 clen = crp->crp_olen; /* Length of data after processing */ 307 308 /* Release the crypto descriptors */ 309 free(tc, M_XDATA), tc = NULL; 310 crypto_freereq(crp), crp = NULL; 311 312 /* In case it's not done already, adjust the size of the mbuf chain */ 313 m->m_pkthdr.len = clen + hlen + skip; 314 315 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { 316 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); /*XXX*/ 317 DPRINTF(("%s: m_pullup failed\n", __func__)); 318 error = EINVAL; /*XXX*/ 319 goto bad; 320 } 321 322 /* Keep the next protocol field */ 323 addr = (uint8_t*) mtod(m, struct ip *) + skip; 324 nproto = ((struct ipcomp *) addr)->comp_nxt; 325 switch (nproto) { 326 case IPPROTO_IPCOMP: 327 case IPPROTO_AH: 328 case IPPROTO_ESP: 329 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 330 DPRINTF(("%s: nested ipcomp, IPCA %s/%08lx\n", __func__, 331 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 332 (u_long) ntohl(sav->spi))); 333 error = EINVAL; 334 goto bad; 335 default: 336 break; 337 } 338 339 /* Remove the IPCOMP header */ 340 error = m_striphdr(m, skip, hlen); 341 if (error) { 342 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 343 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 344 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 345 (u_long) ntohl(sav->spi))); 346 goto bad; 347 } 348 349 /* Restore the Next Protocol field */ 350 m_copyback(m, protoff, sizeof(uint8_t), (uint8_t *) &nproto); 351 352 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff); 353 354 KEY_FREESAV(&sav); 355 mutex_exit(softnet_lock); 356 splx(s); 357 return error; 358 bad: 359 if (sav) 360 KEY_FREESAV(&sav); 361 mutex_exit(softnet_lock); 362 splx(s); 363 if (m) 364 m_freem(m); 365 if (tc != NULL) 366 free(tc, M_XDATA); 367 if (crp) 368 crypto_freereq(crp); 369 return error; 370 } 371 372 /* 373 * IPComp output routine, called by ipsec[46]_process_packet() 374 */ 375 static int 376 ipcomp_output( 377 struct mbuf *m, 378 struct ipsecrequest *isr, 379 struct mbuf **mp, 380 int skip, 381 int protoff 382 ) 383 { 384 char buf[IPSEC_ADDRSTRLEN]; 385 struct secasvar *sav; 386 const struct comp_algo *ipcompx; 387 int error, ralen, hlen, maxpacketsize; 388 struct cryptodesc *crdc; 389 struct cryptop *crp; 390 struct tdb_crypto *tc; 391 392 IPSEC_SPLASSERT_SOFTNET(__func__); 393 KASSERT(isr->sav != NULL); 394 sav = isr->sav; 395 KASSERT(sav->tdb_compalgxform != NULL); 396 ipcompx = sav->tdb_compalgxform; 397 398 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 399 400 /* Don't process the packet if it is too short */ 401 if (ralen < ipcompx->minlen) { 402 IPCOMP_STATINC(IPCOMP_STAT_MINLEN); 403 return ipsec_process_done(m,isr); 404 } 405 406 hlen = IPCOMP_HLENGTH; 407 408 IPCOMP_STATINC(IPCOMP_STAT_OUTPUT); 409 410 /* Check for maximum packet size violations. */ 411 switch (sav->sah->saidx.dst.sa.sa_family) { 412 #ifdef INET 413 case AF_INET: 414 maxpacketsize = IP_MAXPACKET; 415 break; 416 #endif /* INET */ 417 #ifdef INET6 418 case AF_INET6: 419 maxpacketsize = IPV6_MAXPACKET; 420 break; 421 #endif /* INET6 */ 422 default: 423 IPCOMP_STATINC(IPCOMP_STAT_NOPF); 424 DPRINTF(("%s: unknown/unsupported protocol family %d" 425 ", IPCA %s/%08lx\n", __func__, 426 sav->sah->saidx.dst.sa.sa_family, 427 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 428 (u_long) ntohl(sav->spi))); 429 error = EPFNOSUPPORT; 430 goto bad; 431 } 432 if (skip + hlen + ralen > maxpacketsize) { 433 IPCOMP_STATINC(IPCOMP_STAT_TOOBIG); 434 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 435 "(len %u, max len %u)\n", __func__, 436 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 437 (u_long) ntohl(sav->spi), 438 skip + hlen + ralen, maxpacketsize)); 439 error = EMSGSIZE; 440 goto bad; 441 } 442 443 /* Update the counters */ 444 IPCOMP_STATADD(IPCOMP_STAT_OBYTES, m->m_pkthdr.len - skip); 445 446 m = m_clone(m); 447 if (m == NULL) { 448 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 449 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 450 __func__, 451 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 452 (u_long) ntohl(sav->spi))); 453 error = ENOBUFS; 454 goto bad; 455 } 456 457 /* Ok now, we can pass to the crypto processing */ 458 459 /* Get crypto descriptors */ 460 crp = crypto_getreq(1); 461 if (crp == NULL) { 462 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 463 DPRINTF(("%s: failed to acquire crypto descriptor\n", 464 __func__)); 465 error = ENOBUFS; 466 goto bad; 467 } 468 crdc = crp->crp_desc; 469 470 /* Compression descriptor */ 471 crdc->crd_skip = skip; 472 crdc->crd_len = m->m_pkthdr.len - skip; 473 crdc->crd_flags = CRD_F_COMP; 474 crdc->crd_inject = skip; 475 476 /* Compression operation */ 477 crdc->crd_alg = ipcompx->type; 478 479 /* IPsec-specific opaque crypto info */ 480 tc = malloc(sizeof(*tc), M_XDATA, M_NOWAIT|M_ZERO); 481 if (tc == NULL) { 482 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 483 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__)); 484 crypto_freereq(crp); 485 error = ENOBUFS; 486 goto bad; 487 } 488 489 tc->tc_isr = isr; 490 tc->tc_spi = sav->spi; 491 tc->tc_dst = sav->sah->saidx.dst; 492 tc->tc_proto = sav->sah->saidx.proto; 493 tc->tc_skip = skip; 494 tc->tc_protoff = protoff; 495 tc->tc_sav = sav; 496 KEY_SA_REF(sav); 497 498 /* Crypto operation descriptor */ 499 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 500 crp->crp_flags = CRYPTO_F_IMBUF; 501 crp->crp_buf = m; 502 crp->crp_callback = ipcomp_output_cb; 503 crp->crp_opaque = tc; 504 crp->crp_sid = sav->tdb_cryptoid; 505 506 return crypto_dispatch(crp); 507 bad: 508 if (m) 509 m_freem(m); 510 return (error); 511 } 512 513 /* 514 * IPComp output callback from the crypto driver. 515 */ 516 static int 517 ipcomp_output_cb(struct cryptop *crp) 518 { 519 char buf[IPSEC_ADDRSTRLEN]; 520 struct tdb_crypto *tc; 521 struct ipsecrequest *isr; 522 struct secasvar *sav; 523 struct mbuf *m, *mo; 524 int s, error, skip, rlen, roff; 525 uint8_t prot; 526 uint16_t cpi; 527 struct ipcomp * ipcomp; 528 529 KASSERT(crp->crp_opaque != NULL); 530 tc = crp->crp_opaque; 531 m = crp->crp_buf; 532 skip = tc->tc_skip; 533 rlen = crp->crp_ilen - skip; 534 535 s = splsoftnet(); 536 mutex_enter(softnet_lock); 537 538 isr = tc->tc_isr; 539 sav = tc->tc_sav; 540 if (__predict_false(!SADB_SASTATE_USABLE_P(sav))) { 541 KEY_FREESAV(&sav); 542 sav = KEY_LOOKUP_SA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, 0, 0); 543 if (sav == NULL) { 544 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 545 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 546 error = ENOBUFS; /*XXX*/ 547 goto bad; 548 } 549 } 550 KASSERTMSG(isr->sav == sav, "SA changed"); 551 552 /* Check for crypto errors */ 553 if (crp->crp_etype) { 554 /* Reset session ID */ 555 if (sav->tdb_cryptoid != 0) 556 sav->tdb_cryptoid = crp->crp_sid; 557 558 if (crp->crp_etype == EAGAIN) { 559 KEY_FREESAV(&sav); 560 mutex_exit(softnet_lock); 561 splx(s); 562 return crypto_dispatch(crp); 563 } 564 IPCOMP_STATINC(IPCOMP_STAT_NOXFORM); 565 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 566 error = crp->crp_etype; 567 goto bad; 568 } 569 /* Shouldn't happen... */ 570 if (m == NULL) { 571 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 572 DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 573 error = EINVAL; 574 goto bad; 575 } 576 IPCOMP_STATINC(IPCOMP_STAT_HIST + ipcomp_stats[sav->alg_comp]); 577 578 if (rlen > crp->crp_olen) { 579 /* Inject IPCOMP header */ 580 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 581 if (mo == NULL) { 582 IPCOMP_STATINC(IPCOMP_STAT_WRAP); 583 DPRINTF(("%s: failed to inject IPCOMP header for " 584 "IPCA %s/%08lx\n", __func__, 585 ipsec_address(&sav->sah->saidx.dst, buf, 586 sizeof(buf)), (u_long) ntohl(sav->spi))); 587 error = ENOBUFS; 588 goto bad; 589 } 590 ipcomp = (struct ipcomp *)(mtod(mo, char *) + roff); 591 592 /* Initialize the IPCOMP header */ 593 /* XXX alignment always correct? */ 594 switch (sav->sah->saidx.dst.sa.sa_family) { 595 #ifdef INET 596 case AF_INET: 597 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 598 break; 599 #endif /* INET */ 600 #ifdef INET6 601 case AF_INET6: 602 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 603 break; 604 #endif 605 } 606 ipcomp->comp_flags = 0; 607 608 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0) 609 cpi = sav->alg_enc; 610 else 611 cpi = ntohl(sav->spi) & 0xffff; 612 ipcomp->comp_cpi = htons(cpi); 613 614 /* Fix Next Protocol in IPv4/IPv6 header */ 615 prot = IPPROTO_IPCOMP; 616 m_copyback(m, tc->tc_protoff, sizeof(uint8_t), (u_char *)&prot); 617 618 /* Adjust the length in the IP header */ 619 switch (sav->sah->saidx.dst.sa.sa_family) { 620 #ifdef INET 621 case AF_INET: 622 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 623 break; 624 #endif /* INET */ 625 #ifdef INET6 626 case AF_INET6: 627 mtod(m, struct ip6_hdr *)->ip6_plen = 628 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 629 break; 630 #endif /* INET6 */ 631 default: 632 IPCOMP_STATINC(IPCOMP_STAT_NOPF); 633 DPRINTF(("ipcomp_output: unknown/unsupported protocol " 634 "family %d, IPCA %s/%08lx\n", 635 sav->sah->saidx.dst.sa.sa_family, 636 ipsec_address(&sav->sah->saidx.dst, buf, 637 sizeof(buf)), (u_long) ntohl(sav->spi))); 638 error = EPFNOSUPPORT; 639 goto bad; 640 } 641 } else { 642 /* compression was useless, we have lost time */ 643 IPCOMP_STATINC(IPCOMP_STAT_USELESS); 644 DPRINTF(("ipcomp_output_cb: compression was useless : initial size was %d" 645 "and compressed size is %d\n", rlen, crp->crp_olen)); 646 } 647 648 649 /* Release the crypto descriptor */ 650 free(tc, M_XDATA); 651 crypto_freereq(crp); 652 653 /* NB: m is reclaimed by ipsec_process_done. */ 654 error = ipsec_process_done(m, isr); 655 KEY_FREESAV(&sav); 656 mutex_exit(softnet_lock); 657 splx(s); 658 return error; 659 bad: 660 if (sav) 661 KEY_FREESAV(&sav); 662 mutex_exit(softnet_lock); 663 splx(s); 664 if (m) 665 m_freem(m); 666 free(tc, M_XDATA); 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 xform_register(&ipcomp_xformsw); 687 } 688
Indexes created Tue Sep 23 20:09:58 GMT 2025