xform_ipcomp.c revision 1.32
1 /* $NetBSD: xform_ipcomp.c,v 1.32 2017/04/06 09:20:07 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 1.32 2017/04/06 09:20:07 ozaki-r Exp $"); 34 35 /* IP payload compression protocol (IPComp), see RFC 2393 */ 36 #if defined(_KERNEL_OPT) 37 #include "opt_inet.h" 38 #ifdef __FreeBSD__ 39 #include "opt_inet6.h" 40 #endif 41 #endif 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/mbuf.h> 46 #include <sys/socket.h> 47 #include <sys/kernel.h> 48 #include <sys/protosw.h> 49 #include <sys/sysctl.h> 50 #include <sys/socketvar.h> /* for softnet_lock */ 51 52 #include <netinet/in.h> 53 #include <netinet/in_systm.h> 54 #include <netinet/ip.h> 55 #include <netinet/ip_var.h> 56 57 #include <net/route.h> 58 #include <netipsec/ipsec.h> 59 #include <netipsec/ipsec_private.h> 60 #include <netipsec/xform.h> 61 62 #ifdef INET6 63 #include <netinet/ip6.h> 64 #include <netipsec/ipsec6.h> 65 #endif 66 67 #include <netipsec/ipcomp.h> 68 #include <netipsec/ipcomp_var.h> 69 70 #include <netipsec/key.h> 71 #include <netipsec/key_debug.h> 72 73 #include <netipsec/ipsec_osdep.h> 74 75 #include <opencrypto/cryptodev.h> 76 #include <opencrypto/deflate.h> 77 #include <opencrypto/xform.h> 78 79 percpu_t *ipcompstat_percpu; 80 81 int ipcomp_enable = 1; 82 83 #ifdef __FreeBSD__ 84 SYSCTL_DECL(_net_inet_ipcomp); 85 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, 86 ipcomp_enable, CTLFLAG_RW, &ipcomp_enable, 0, ""); 87 SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS, 88 stats, CTLFLAG_RD, &ipcompstat, ipcompstat, ""); 89 #endif /* __FreeBSD__ */ 90 91 static int ipcomp_input_cb(struct cryptop *crp); 92 static int ipcomp_output_cb(struct cryptop *crp); 93 94 const struct comp_algo * 95 ipcomp_algorithm_lookup(int alg) 96 { 97 if (alg >= IPCOMP_ALG_MAX) 98 return NULL; 99 switch (alg) { 100 case SADB_X_CALG_DEFLATE: 101 return &comp_algo_deflate_nogrow; 102 } 103 return NULL; 104 } 105 106 /* 107 * ipcomp_init() is called when an CPI is being set up. 108 */ 109 static int 110 ipcomp_init(struct secasvar *sav, const struct xformsw *xsp) 111 { 112 const struct comp_algo *tcomp; 113 struct cryptoini cric; 114 int ses; 115 116 /* NB: algorithm really comes in alg_enc and not alg_comp! */ 117 tcomp = ipcomp_algorithm_lookup(sav->alg_enc); 118 if (tcomp == NULL) { 119 DPRINTF(("ipcomp_init: unsupported compression algorithm %d\n", 120 sav->alg_comp)); 121 return EINVAL; 122 } 123 sav->alg_comp = sav->alg_enc; /* set for doing histogram */ 124 sav->tdb_xform = xsp; 125 sav->tdb_compalgxform = tcomp; 126 127 /* Initialize crypto session */ 128 memset(&cric, 0, sizeof (cric)); 129 cric.cri_alg = sav->tdb_compalgxform->type; 130 131 ses = crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support); 132 return ses; 133 } 134 135 /* 136 * ipcomp_zeroize() used when IPCA is deleted 137 */ 138 static int 139 ipcomp_zeroize(struct secasvar *sav) 140 { 141 int err; 142 143 err = crypto_freesession(sav->tdb_cryptoid); 144 sav->tdb_cryptoid = 0; 145 return err; 146 } 147 148 /* 149 * ipcomp_input() gets called to uncompress an input packet 150 */ 151 static int 152 ipcomp_input(struct mbuf *m, const struct secasvar *sav, int skip, int protoff) 153 { 154 struct tdb_crypto *tc; 155 struct cryptodesc *crdc; 156 struct cryptop *crp; 157 int error, hlen = IPCOMP_HLENGTH; 158 159 IPSEC_SPLASSERT_SOFTNET("ipcomp_input"); 160 161 /* Get crypto descriptors */ 162 crp = crypto_getreq(1); 163 if (crp == NULL) { 164 m_freem(m); 165 DPRINTF(("ipcomp_input: no crypto descriptors\n")); 166 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 167 return ENOBUFS; 168 } 169 /* Get IPsec-specific opaque pointer */ 170 tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO); 171 if (tc == NULL) { 172 m_freem(m); 173 crypto_freereq(crp); 174 DPRINTF(("ipcomp_input: cannot allocate tdb_crypto\n")); 175 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 176 return ENOBUFS; 177 } 178 179 error = m_makewritable(&m, 0, m->m_pkthdr.len, M_NOWAIT); 180 if (error) { 181 DPRINTF(("ipcomp_input: m_makewritable failed\n")); 182 m_freem(m); 183 free(tc, M_XDATA); 184 crypto_freereq(crp); 185 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 186 return error; 187 } 188 189 crdc = crp->crp_desc; 190 191 crdc->crd_skip = skip + hlen; 192 crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 193 crdc->crd_inject = 0; /* unused */ 194 195 tc->tc_ptr = 0; 196 197 /* Decompression operation */ 198 crdc->crd_alg = sav->tdb_compalgxform->type; 199 200 /* Crypto operation descriptor */ 201 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 202 crp->crp_olen = MCLBYTES; /* hint to decompression code */ 203 crp->crp_flags = CRYPTO_F_IMBUF; 204 crp->crp_buf = m; 205 crp->crp_callback = ipcomp_input_cb; 206 crp->crp_sid = sav->tdb_cryptoid; 207 crp->crp_opaque = tc; 208 209 /* These are passed as-is to the callback */ 210 tc->tc_spi = sav->spi; 211 tc->tc_dst = sav->sah->saidx.dst; 212 tc->tc_proto = sav->sah->saidx.proto; 213 tc->tc_protoff = protoff; 214 tc->tc_skip = skip; 215 216 return crypto_dispatch(crp); 217 } 218 219 #ifdef INET6 220 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \ 221 if (saidx->dst.sa.sa_family == AF_INET6) { \ 222 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \ 223 } else { \ 224 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \ 225 } \ 226 } while (0) 227 #else 228 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \ 229 (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag)) 230 #endif 231 232 /* 233 * IPComp input callback from the crypto driver. 234 */ 235 static int 236 ipcomp_input_cb(struct cryptop *crp) 237 { 238 struct tdb_crypto *tc; 239 int skip, protoff; 240 struct mbuf *m; 241 struct secasvar *sav; 242 struct secasindex *saidx __diagused; 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 tc = (struct tdb_crypto *) crp->crp_opaque; 250 IPSEC_ASSERT(tc != NULL, ("ipcomp_input_cb: null opaque crypto data area!")); 251 skip = tc->tc_skip; 252 protoff = tc->tc_protoff; 253 m = (struct mbuf *) crp->crp_buf; 254 255 /* find the source port for NAT-T */ 256 nat_t_ports_get(m, &dport, &sport); 257 258 s = splsoftnet(); 259 mutex_enter(softnet_lock); 260 261 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, sport, dport); 262 if (sav == NULL) { 263 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 264 DPRINTF(("ipcomp_input_cb: SA expired while in crypto\n")); 265 error = ENOBUFS; /*XXX*/ 266 goto bad; 267 } 268 269 saidx = &sav->sah->saidx; 270 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 271 saidx->dst.sa.sa_family == AF_INET6, 272 ("ipcomp_input_cb: unexpected protocol family %u", 273 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(("ipcomp_input_cb: crypto error %d\n", 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(("ipcomp_input_cb: null mbuf returned from crypto\n")); 297 error = EINVAL; 298 goto bad; 299 } 300 IPCOMP_STATINC(IPCOMP_STAT_HIST + 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(("ipcomp_input_cb: m_pullup failed\n")); 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 if (nproto == IPPROTO_IPCOMP || nproto == IPPROTO_AH || nproto == IPPROTO_ESP) { 326 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 327 DPRINTF(("ipcomp_input_cb: nested ipcomp, IPCA %s/%08lx\n", 328 ipsec_address(&sav->sah->saidx.dst), 329 (u_long) ntohl(sav->spi))); 330 error = EINVAL; 331 goto bad; 332 } 333 334 /* Remove the IPCOMP header */ 335 error = m_striphdr(m, skip, hlen); 336 if (error) { 337 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); 338 DPRINTF(("ipcomp_input_cb: bad mbuf chain, IPCA %s/%08lx\n", 339 ipsec_address(&sav->sah->saidx.dst), 340 (u_long) ntohl(sav->spi))); 341 goto bad; 342 } 343 344 /* Restore the Next Protocol field */ 345 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 346 347 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL); 348 349 KEY_FREESAV(&sav); 350 mutex_exit(softnet_lock); 351 splx(s); 352 return error; 353 bad: 354 if (sav) 355 KEY_FREESAV(&sav); 356 mutex_exit(softnet_lock); 357 splx(s); 358 if (m) 359 m_freem(m); 360 if (tc != NULL) 361 free(tc, M_XDATA); 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 mbuf **mp, 375 int skip, 376 int protoff 377 ) 378 { 379 const struct secasvar *sav; 380 const struct comp_algo *ipcompx; 381 int error, ralen, hlen, maxpacketsize; 382 struct cryptodesc *crdc; 383 struct cryptop *crp; 384 struct tdb_crypto *tc; 385 386 IPSEC_SPLASSERT_SOFTNET("ipcomp_output"); 387 sav = isr->sav; 388 IPSEC_ASSERT(sav != NULL, ("ipcomp_output: null SA")); 389 ipcompx = sav->tdb_compalgxform; 390 IPSEC_ASSERT(ipcompx != NULL, ("ipcomp_output: null compression xform")); 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); 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(("ipcomp_output: unknown/unsupported protocol family %d" 419 ", IPCA %s/%08lx\n", 420 sav->sah->saidx.dst.sa.sa_family, 421 ipsec_address(&sav->sah->saidx.dst), 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(("ipcomp_output: packet in IPCA %s/%08lx got too big " 429 "(len %u, max len %u)\n", 430 ipsec_address(&sav->sah->saidx.dst), 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(("ipcomp_output: cannot clone mbuf chain, IPCA %s/%08lx\n", 444 ipsec_address(&sav->sah->saidx.dst), 445 (u_long) ntohl(sav->spi))); 446 error = ENOBUFS; 447 goto bad; 448 } 449 450 /* Ok now, we can pass to the crypto processing */ 451 452 /* Get crypto descriptors */ 453 crp = crypto_getreq(1); 454 if (crp == NULL) { 455 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 456 DPRINTF(("ipcomp_output: failed to acquire crypto descriptor\n")); 457 error = ENOBUFS; 458 goto bad; 459 } 460 crdc = crp->crp_desc; 461 462 /* Compression descriptor */ 463 crdc->crd_skip = skip; 464 crdc->crd_len = m->m_pkthdr.len - skip; 465 crdc->crd_flags = CRD_F_COMP; 466 crdc->crd_inject = skip; 467 468 /* Compression operation */ 469 crdc->crd_alg = ipcompx->type; 470 471 /* IPsec-specific opaque crypto info */ 472 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto), 473 M_XDATA, M_NOWAIT|M_ZERO); 474 if (tc == NULL) { 475 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 476 DPRINTF(("ipcomp_output: failed to allocate tdb_crypto\n")); 477 crypto_freereq(crp); 478 error = ENOBUFS; 479 goto bad; 480 } 481 482 tc->tc_isr = isr; 483 tc->tc_spi = sav->spi; 484 tc->tc_dst = sav->sah->saidx.dst; 485 tc->tc_proto = sav->sah->saidx.proto; 486 tc->tc_skip = skip; 487 tc->tc_protoff = protoff; 488 489 /* Crypto operation descriptor */ 490 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 491 crp->crp_flags = CRYPTO_F_IMBUF; 492 crp->crp_buf = m; 493 crp->crp_callback = ipcomp_output_cb; 494 crp->crp_opaque = tc; 495 crp->crp_sid = sav->tdb_cryptoid; 496 497 return crypto_dispatch(crp); 498 bad: 499 if (m) 500 m_freem(m); 501 return (error); 502 } 503 504 /* 505 * IPComp output callback from the crypto driver. 506 */ 507 static int 508 ipcomp_output_cb(struct cryptop *crp) 509 { 510 struct tdb_crypto *tc; 511 struct ipsecrequest *isr; 512 struct secasvar *sav; 513 struct mbuf *m, *mo; 514 int s, error, skip, rlen, roff; 515 u_int8_t prot; 516 u_int16_t cpi; 517 struct ipcomp * ipcomp; 518 519 520 tc = (struct tdb_crypto *) crp->crp_opaque; 521 IPSEC_ASSERT(tc != NULL, ("ipcomp_output_cb: null opaque data area!")); 522 m = (struct mbuf *) crp->crp_buf; 523 skip = tc->tc_skip; 524 rlen = crp->crp_ilen - skip; 525 526 s = splsoftnet(); 527 mutex_enter(softnet_lock); 528 529 isr = tc->tc_isr; 530 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, 0, 0); 531 if (sav == NULL) { 532 IPCOMP_STATINC(IPCOMP_STAT_NOTDB); 533 DPRINTF(("ipcomp_output_cb: SA expired while in crypto\n")); 534 error = ENOBUFS; /*XXX*/ 535 goto bad; 536 } 537 IPSEC_ASSERT(isr->sav == sav, ("ipcomp_output_cb: SA changed\n")); 538 539 /* Check for crypto errors */ 540 if (crp->crp_etype) { 541 /* Reset session ID */ 542 if (sav->tdb_cryptoid != 0) 543 sav->tdb_cryptoid = crp->crp_sid; 544 545 if (crp->crp_etype == EAGAIN) { 546 KEY_FREESAV(&sav); 547 mutex_exit(softnet_lock); 548 splx(s); 549 return crypto_dispatch(crp); 550 } 551 IPCOMP_STATINC(IPCOMP_STAT_NOXFORM); 552 DPRINTF(("ipcomp_output_cb: crypto error %d\n", crp->crp_etype)); 553 error = crp->crp_etype; 554 goto bad; 555 } 556 /* Shouldn't happen... */ 557 if (m == NULL) { 558 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO); 559 DPRINTF(("ipcomp_output_cb: bogus return buffer from crypto\n")); 560 error = EINVAL; 561 goto bad; 562 } 563 IPCOMP_STATINC(IPCOMP_STAT_HIST + sav->alg_comp); 564 565 if (rlen > crp->crp_olen) { 566 /* Inject IPCOMP header */ 567 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 568 if (mo == NULL) { 569 IPCOMP_STATINC(IPCOMP_STAT_WRAP); 570 DPRINTF(("ipcomp_output: failed to inject IPCOMP header for " 571 "IPCA %s/%08lx\n", 572 ipsec_address(&sav->sah->saidx.dst), 573 (u_long) ntohl(sav->spi))); 574 error = ENOBUFS; 575 goto bad; 576 } 577 ipcomp = (struct ipcomp *)(mtod(mo, char *) + roff); 578 579 /* Initialize the IPCOMP header */ 580 /* XXX alignment always correct? */ 581 switch (sav->sah->saidx.dst.sa.sa_family) { 582 #ifdef INET 583 case AF_INET: 584 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 585 break; 586 #endif /* INET */ 587 #ifdef INET6 588 case AF_INET6: 589 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 590 break; 591 #endif 592 } 593 ipcomp->comp_flags = 0; 594 595 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0) 596 cpi = sav->alg_enc; 597 else 598 cpi = ntohl(sav->spi) & 0xffff; 599 ipcomp->comp_cpi = htons(cpi); 600 601 /* Fix Next Protocol in IPv4/IPv6 header */ 602 prot = IPPROTO_IPCOMP; 603 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t), (u_char *)&prot); 604 605 /* Adjust the length in the IP header */ 606 switch (sav->sah->saidx.dst.sa.sa_family) { 607 #ifdef INET 608 case AF_INET: 609 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 610 break; 611 #endif /* INET */ 612 #ifdef INET6 613 case AF_INET6: 614 mtod(m, struct ip6_hdr *)->ip6_plen = 615 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 616 break; 617 #endif /* INET6 */ 618 default: 619 IPCOMP_STATINC(IPCOMP_STAT_NOPF); 620 DPRINTF(("ipcomp_output: unknown/unsupported protocol " 621 "family %d, IPCA %s/%08lx\n", 622 sav->sah->saidx.dst.sa.sa_family, 623 ipsec_address(&sav->sah->saidx.dst), 624 (u_long) ntohl(sav->spi))); 625 error = EPFNOSUPPORT; 626 goto bad; 627 } 628 } else { 629 /* compression was useless, we have lost time */ 630 IPCOMP_STATINC(IPCOMP_STAT_USELESS); 631 DPRINTF(("ipcomp_output_cb: compression was useless : initial size was %d" 632 "and compressed size is %d\n", rlen, crp->crp_olen)); 633 } 634 635 636 /* Release the crypto descriptor */ 637 free(tc, M_XDATA); 638 crypto_freereq(crp); 639 640 /* NB: m is reclaimed by ipsec_process_done. */ 641 error = ipsec_process_done(m, isr); 642 KEY_FREESAV(&sav); 643 mutex_exit(softnet_lock); 644 splx(s); 645 return error; 646 bad: 647 if (sav) 648 KEY_FREESAV(&sav); 649 mutex_exit(softnet_lock); 650 splx(s); 651 if (m) 652 m_freem(m); 653 free(tc, M_XDATA); 654 crypto_freereq(crp); 655 return error; 656 } 657 658 static struct xformsw ipcomp_xformsw = { 659 XF_IPCOMP, XFT_COMP, "IPcomp", 660 ipcomp_init, ipcomp_zeroize, ipcomp_input, 661 ipcomp_output, 662 NULL, 663 }; 664 665 INITFN void 666 ipcomp_attach(void) 667 { 668 ipcompstat_percpu = percpu_alloc(sizeof(uint64_t) * IPCOMP_NSTATS); 669 xform_register(&ipcomp_xformsw); 670 } 671 672 #ifdef __FreeBSD__ 673 SYSINIT(ipcomp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipcomp_attach, NULL) 674 #endif /* __FreeBSD__ */ 675
Indexes created Mon Sep 22 21:09:42 GMT 2025