Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netipsec/xform_ipcomp.c
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1 /* $FreeBSD$ */ 2 /* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */ 3 4 /*- 5 * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org) 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 /* IP payload compression protocol (IPComp), see RFC 2393 */ 32 #include "opt_inet.h" 33 #include "opt_inet6.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/mbuf.h> 38 #include <sys/lock.h> 39 #include <sys/mutex.h> 40 #include <sys/rwlock.h> 41 #include <sys/socket.h> 42 #include <sys/kernel.h> 43 #include <sys/protosw.h> 44 #include <sys/sysctl.h> 45 46 #include <netinet/in.h> 47 #include <netinet/in_systm.h> 48 #include <netinet/ip.h> 49 #include <netinet/ip_var.h> 50 51 #include <net/vnet.h> 52 53 #include <netipsec/ipsec.h> 54 #include <netipsec/xform.h> 55 56 #ifdef INET6 57 #include <netinet/ip6.h> 58 #include <netipsec/ipsec6.h> 59 #endif 60 61 #include <netipsec/ipcomp.h> 62 #include <netipsec/ipcomp_var.h> 63 64 #include <netipsec/key.h> 65 #include <netipsec/key_debug.h> 66 67 #include <opencrypto/cryptodev.h> 68 #include <opencrypto/deflate.h> 69 #include <opencrypto/xform.h> 70 71 VNET_DEFINE(int, ipcomp_enable) = 1; 72 VNET_PCPUSTAT_DEFINE(struct ipcompstat, ipcompstat); 73 VNET_PCPUSTAT_SYSINIT(ipcompstat); 74 75 #ifdef VIMAGE 76 VNET_PCPUSTAT_SYSUNINIT(ipcompstat); 77 #endif /* VIMAGE */ 78 79 SYSCTL_DECL(_net_inet_ipcomp); 80 SYSCTL_VNET_INT(_net_inet_ipcomp, OID_AUTO, 81 ipcomp_enable, CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, ""); 82 SYSCTL_VNET_PCPUSTAT(_net_inet_ipcomp, IPSECCTL_STATS, stats, 83 struct ipcompstat, ipcompstat, 84 "IPCOMP statistics (struct ipcompstat, netipsec/ipcomp_var.h"); 85 86 static int ipcomp_input_cb(struct cryptop *crp); 87 static int ipcomp_output_cb(struct cryptop *crp); 88 89 struct comp_algo * 90 ipcomp_algorithm_lookup(int alg) 91 { 92 if (alg >= IPCOMP_ALG_MAX) 93 return NULL; 94 switch (alg) { 95 case SADB_X_CALG_DEFLATE: 96 return &comp_algo_deflate; 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, struct xformsw *xsp) 106 { 107 struct comp_algo *tcomp; 108 struct cryptoini cric; 109 110 /* NB: algorithm really comes in alg_enc and not alg_comp! */ 111 tcomp = ipcomp_algorithm_lookup(sav->alg_enc); 112 if (tcomp == NULL) { 113 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__, 114 sav->alg_comp)); 115 return EINVAL; 116 } 117 sav->alg_comp = sav->alg_enc; /* set for doing histogram */ 118 sav->tdb_xform = xsp; 119 sav->tdb_compalgxform = tcomp; 120 121 /* Initialize crypto session */ 122 bzero(&cric, sizeof (cric)); 123 cric.cri_alg = sav->tdb_compalgxform->type; 124 125 return crypto_newsession(&sav->tdb_cryptoid, &cric, V_crypto_support); 126 } 127 128 /* 129 * ipcomp_zeroize() used when IPCA is deleted 130 */ 131 static int 132 ipcomp_zeroize(struct secasvar *sav) 133 { 134 int err; 135 136 err = crypto_freesession(sav->tdb_cryptoid); 137 sav->tdb_cryptoid = 0; 138 return err; 139 } 140 141 /* 142 * ipcomp_input() gets called to uncompress an input packet 143 */ 144 static int 145 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 146 { 147 struct tdb_crypto *tc; 148 struct cryptodesc *crdc; 149 struct cryptop *crp; 150 struct ipcomp *ipcomp; 151 caddr_t addr; 152 int hlen = IPCOMP_HLENGTH; 153 154 /* 155 * Check that the next header of the IPComp is not IPComp again, before 156 * doing any real work. Given it is not possible to do double 157 * compression it means someone is playing tricks on us. 158 */ 159 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 160 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 161 DPRINTF(("%s: m_pullup failed\n", __func__)); 162 return (ENOBUFS); 163 } 164 addr = (caddr_t) mtod(m, struct ip *) + skip; 165 ipcomp = (struct ipcomp *)addr; 166 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) { 167 m_freem(m); 168 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */ 169 DPRINTF(("%s: recursive compression detected\n", __func__)); 170 return (EINVAL); 171 } 172 173 /* Get crypto descriptors */ 174 crp = crypto_getreq(1); 175 if (crp == NULL) { 176 m_freem(m); 177 DPRINTF(("%s: no crypto descriptors\n", __func__)); 178 IPCOMPSTAT_INC(ipcomps_crypto); 179 return ENOBUFS; 180 } 181 /* Get IPsec-specific opaque pointer */ 182 tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO); 183 if (tc == NULL) { 184 m_freem(m); 185 crypto_freereq(crp); 186 DPRINTF(("%s: cannot allocate tdb_crypto\n", __func__)); 187 IPCOMPSTAT_INC(ipcomps_crypto); 188 return ENOBUFS; 189 } 190 crdc = crp->crp_desc; 191 192 crdc->crd_skip = skip + hlen; 193 crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 194 crdc->crd_inject = skip; 195 196 tc->tc_ptr = 0; 197 198 /* Decompression operation */ 199 crdc->crd_alg = sav->tdb_compalgxform->type; 200 201 /* Crypto operation descriptor */ 202 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 203 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 204 crp->crp_buf = (caddr_t) m; 205 crp->crp_callback = ipcomp_input_cb; 206 crp->crp_sid = sav->tdb_cryptoid; 207 crp->crp_opaque = (caddr_t) 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 KEY_ADDREFSA(sav); 216 tc->tc_sav = sav; 217 218 return crypto_dispatch(crp); 219 } 220 221 /* 222 * IPComp input callback from the crypto driver. 223 */ 224 static int 225 ipcomp_input_cb(struct cryptop *crp) 226 { 227 struct cryptodesc *crd; 228 struct tdb_crypto *tc; 229 int skip, protoff; 230 struct mtag *mtag; 231 struct mbuf *m; 232 struct secasvar *sav; 233 struct secasindex *saidx; 234 int hlen = IPCOMP_HLENGTH, error, clen; 235 u_int8_t nproto; 236 caddr_t addr; 237 238 crd = crp->crp_desc; 239 240 tc = (struct tdb_crypto *) crp->crp_opaque; 241 IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!")); 242 skip = tc->tc_skip; 243 protoff = tc->tc_protoff; 244 mtag = (struct mtag *) tc->tc_ptr; 245 m = (struct mbuf *) crp->crp_buf; 246 247 sav = tc->tc_sav; 248 IPSEC_ASSERT(sav != NULL, ("null SA!")); 249 250 saidx = &sav->sah->saidx; 251 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 252 saidx->dst.sa.sa_family == AF_INET6, 253 ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 254 255 /* Check for crypto errors */ 256 if (crp->crp_etype) { 257 /* Reset the session ID */ 258 if (sav->tdb_cryptoid != 0) 259 sav->tdb_cryptoid = crp->crp_sid; 260 261 if (crp->crp_etype == EAGAIN) { 262 return crypto_dispatch(crp); 263 } 264 IPCOMPSTAT_INC(ipcomps_noxform); 265 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 266 error = crp->crp_etype; 267 goto bad; 268 } 269 /* Shouldn't happen... */ 270 if (m == NULL) { 271 IPCOMPSTAT_INC(ipcomps_crypto); 272 DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 273 error = EINVAL; 274 goto bad; 275 } 276 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 277 278 clen = crp->crp_olen; /* Length of data after processing */ 279 280 /* Release the crypto descriptors */ 281 free(tc, M_XDATA), tc = NULL; 282 crypto_freereq(crp), crp = NULL; 283 284 /* In case it's not done already, adjust the size of the mbuf chain */ 285 m->m_pkthdr.len = clen + hlen + skip; 286 287 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { 288 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 289 DPRINTF(("%s: m_pullup failed\n", __func__)); 290 error = EINVAL; /*XXX*/ 291 goto bad; 292 } 293 294 /* Keep the next protocol field */ 295 addr = (caddr_t) mtod(m, struct ip *) + skip; 296 nproto = ((struct ipcomp *) addr)->comp_nxt; 297 298 /* Remove the IPCOMP header */ 299 error = m_striphdr(m, skip, hlen); 300 if (error) { 301 IPCOMPSTAT_INC(ipcomps_hdrops); 302 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 303 ipsec_address(&sav->sah->saidx.dst), 304 (u_long) ntohl(sav->spi))); 305 goto bad; 306 } 307 308 /* Restore the Next Protocol field */ 309 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 310 311 switch (saidx->dst.sa.sa_family) { 312 #ifdef INET6 313 case AF_INET6: 314 error = ipsec6_common_input_cb(m, sav, skip, protoff, NULL); 315 break; 316 #endif 317 #ifdef INET 318 case AF_INET: 319 error = ipsec4_common_input_cb(m, sav, skip, protoff, NULL); 320 break; 321 #endif 322 default: 323 panic("%s: Unexpected address family: %d saidx=%p", __func__, 324 saidx->dst.sa.sa_family, saidx); 325 } 326 327 KEY_FREESAV(&sav); 328 return error; 329 bad: 330 if (sav) 331 KEY_FREESAV(&sav); 332 if (m) 333 m_freem(m); 334 if (tc != NULL) 335 free(tc, M_XDATA); 336 if (crp) 337 crypto_freereq(crp); 338 return error; 339 } 340 341 /* 342 * IPComp output routine, called by ipsec[46]_process_packet() 343 */ 344 static int 345 ipcomp_output( 346 struct mbuf *m, 347 struct ipsecrequest *isr, 348 struct mbuf **mp, 349 int skip, 350 int protoff 351 ) 352 { 353 struct secasvar *sav; 354 struct comp_algo *ipcompx; 355 int error, ralen, maxpacketsize; 356 struct cryptodesc *crdc; 357 struct cryptop *crp; 358 struct tdb_crypto *tc; 359 360 sav = isr->sav; 361 IPSEC_ASSERT(sav != NULL, ("null SA")); 362 ipcompx = sav->tdb_compalgxform; 363 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 364 365 /* 366 * Do not touch the packet in case our payload to compress 367 * is lower than the minimal threshold of the compression 368 * alogrithm. We will just send out the data uncompressed. 369 * See RFC 3173, 2.2. Non-Expansion Policy. 370 */ 371 if (m->m_pkthdr.len <= ipcompx->minlen) { 372 IPCOMPSTAT_INC(ipcomps_threshold); 373 return ipsec_process_done(m, isr); 374 } 375 376 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 377 IPCOMPSTAT_INC(ipcomps_output); 378 379 /* Check for maximum packet size violations. */ 380 switch (sav->sah->saidx.dst.sa.sa_family) { 381 #ifdef INET 382 case AF_INET: 383 maxpacketsize = IP_MAXPACKET; 384 break; 385 #endif /* INET */ 386 #ifdef INET6 387 case AF_INET6: 388 maxpacketsize = IPV6_MAXPACKET; 389 break; 390 #endif /* INET6 */ 391 default: 392 IPCOMPSTAT_INC(ipcomps_nopf); 393 DPRINTF(("%s: unknown/unsupported protocol family %d, " 394 "IPCA %s/%08lx\n", __func__, 395 sav->sah->saidx.dst.sa.sa_family, 396 ipsec_address(&sav->sah->saidx.dst), 397 (u_long) ntohl(sav->spi))); 398 error = EPFNOSUPPORT; 399 goto bad; 400 } 401 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 402 IPCOMPSTAT_INC(ipcomps_toobig); 403 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 404 "(len %u, max len %u)\n", __func__, 405 ipsec_address(&sav->sah->saidx.dst), 406 (u_long) ntohl(sav->spi), 407 ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 408 error = EMSGSIZE; 409 goto bad; 410 } 411 412 /* Update the counters */ 413 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip); 414 415 m = m_unshare(m, M_NOWAIT); 416 if (m == NULL) { 417 IPCOMPSTAT_INC(ipcomps_hdrops); 418 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 419 __func__, ipsec_address(&sav->sah->saidx.dst), 420 (u_long) ntohl(sav->spi))); 421 error = ENOBUFS; 422 goto bad; 423 } 424 425 /* Ok now, we can pass to the crypto processing. */ 426 427 /* Get crypto descriptors */ 428 crp = crypto_getreq(1); 429 if (crp == NULL) { 430 IPCOMPSTAT_INC(ipcomps_crypto); 431 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 432 error = ENOBUFS; 433 goto bad; 434 } 435 crdc = crp->crp_desc; 436 437 /* Compression descriptor */ 438 crdc->crd_skip = skip; 439 crdc->crd_len = ralen; 440 crdc->crd_flags = CRD_F_COMP; 441 crdc->crd_inject = skip; 442 443 /* Compression operation */ 444 crdc->crd_alg = ipcompx->type; 445 446 /* IPsec-specific opaque crypto info */ 447 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto), 448 M_XDATA, M_NOWAIT|M_ZERO); 449 if (tc == NULL) { 450 IPCOMPSTAT_INC(ipcomps_crypto); 451 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__)); 452 crypto_freereq(crp); 453 error = ENOBUFS; 454 goto bad; 455 } 456 457 tc->tc_isr = isr; 458 KEY_ADDREFSA(sav); 459 tc->tc_sav = sav; 460 tc->tc_spi = sav->spi; 461 tc->tc_dst = sav->sah->saidx.dst; 462 tc->tc_proto = sav->sah->saidx.proto; 463 tc->tc_protoff = protoff; 464 tc->tc_skip = skip; 465 466 /* Crypto operation descriptor */ 467 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 468 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 469 crp->crp_buf = (caddr_t) m; 470 crp->crp_callback = ipcomp_output_cb; 471 crp->crp_opaque = (caddr_t) tc; 472 crp->crp_sid = sav->tdb_cryptoid; 473 474 return crypto_dispatch(crp); 475 bad: 476 if (m) 477 m_freem(m); 478 return (error); 479 } 480 481 /* 482 * IPComp output callback from the crypto driver. 483 */ 484 static int 485 ipcomp_output_cb(struct cryptop *crp) 486 { 487 struct tdb_crypto *tc; 488 struct ipsecrequest *isr; 489 struct secasvar *sav; 490 struct mbuf *m; 491 int error, skip; 492 493 tc = (struct tdb_crypto *) crp->crp_opaque; 494 IPSEC_ASSERT(tc != NULL, ("null opaque data area!")); 495 m = (struct mbuf *) crp->crp_buf; 496 skip = tc->tc_skip; 497 498 isr = tc->tc_isr; 499 IPSECREQUEST_LOCK(isr); 500 sav = tc->tc_sav; 501 /* With the isr lock released SA pointer can be updated. */ 502 if (sav != isr->sav) { 503 IPCOMPSTAT_INC(ipcomps_notdb); 504 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 505 error = ENOBUFS; /*XXX*/ 506 goto bad; 507 } 508 509 /* Check for crypto errors */ 510 if (crp->crp_etype) { 511 /* Reset the session ID */ 512 if (sav->tdb_cryptoid != 0) 513 sav->tdb_cryptoid = crp->crp_sid; 514 515 if (crp->crp_etype == EAGAIN) { 516 IPSECREQUEST_UNLOCK(isr); 517 return crypto_dispatch(crp); 518 } 519 IPCOMPSTAT_INC(ipcomps_noxform); 520 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 521 error = crp->crp_etype; 522 goto bad; 523 } 524 /* Shouldn't happen... */ 525 if (m == NULL) { 526 IPCOMPSTAT_INC(ipcomps_crypto); 527 DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 528 error = EINVAL; 529 goto bad; 530 } 531 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 532 533 if (crp->crp_ilen - skip > crp->crp_olen) { 534 struct mbuf *mo; 535 struct ipcomp *ipcomp; 536 int roff; 537 uint8_t prot; 538 539 /* Compression helped, inject IPCOMP header. */ 540 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 541 if (mo == NULL) { 542 IPCOMPSTAT_INC(ipcomps_wrap); 543 DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n", 544 __func__, ipsec_address(&sav->sah->saidx.dst), 545 (u_long) ntohl(sav->spi))); 546 error = ENOBUFS; 547 goto bad; 548 } 549 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 550 551 /* Initialize the IPCOMP header */ 552 /* XXX alignment always correct? */ 553 switch (sav->sah->saidx.dst.sa.sa_family) { 554 #ifdef INET 555 case AF_INET: 556 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 557 break; 558 #endif /* INET */ 559 #ifdef INET6 560 case AF_INET6: 561 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 562 break; 563 #endif 564 } 565 ipcomp->comp_flags = 0; 566 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 567 568 /* Fix Next Protocol in IPv4/IPv6 header */ 569 prot = IPPROTO_IPCOMP; 570 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t), 571 (u_char *)&prot); 572 573 /* Adjust the length in the IP header */ 574 switch (sav->sah->saidx.dst.sa.sa_family) { 575 #ifdef INET 576 case AF_INET: 577 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 578 break; 579 #endif /* INET */ 580 #ifdef INET6 581 case AF_INET6: 582 mtod(m, struct ip6_hdr *)->ip6_plen = 583 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 584 break; 585 #endif /* INET6 */ 586 default: 587 IPCOMPSTAT_INC(ipcomps_nopf); 588 DPRINTF(("%s: unknown/unsupported protocol " 589 "family %d, IPCA %s/%08lx\n", __func__, 590 sav->sah->saidx.dst.sa.sa_family, 591 ipsec_address(&sav->sah->saidx.dst), 592 (u_long) ntohl(sav->spi))); 593 error = EPFNOSUPPORT; 594 goto bad; 595 } 596 } else { 597 /* Compression was useless, we have lost time. */ 598 IPCOMPSTAT_INC(ipcomps_uncompr); 599 DPRINTF(("%s: compressions was useless %d - %d <= %d\n", 600 __func__, crp->crp_ilen, skip, crp->crp_olen)); 601 /* XXX remember state to not compress the next couple 602 * of packets, RFC 3173, 2.2. Non-Expansion Policy */ 603 } 604 605 /* Release the crypto descriptor */ 606 free(tc, M_XDATA); 607 crypto_freereq(crp); 608 609 /* NB: m is reclaimed by ipsec_process_done. */ 610 error = ipsec_process_done(m, isr); 611 KEY_FREESAV(&sav); 612 IPSECREQUEST_UNLOCK(isr); 613 return error; 614 bad: 615 if (sav) 616 KEY_FREESAV(&sav); 617 IPSECREQUEST_UNLOCK(isr); 618 if (m) 619 m_freem(m); 620 free(tc, M_XDATA); 621 crypto_freereq(crp); 622 return error; 623 } 624 625 static struct xformsw ipcomp_xformsw = { 626 XF_IPCOMP, XFT_COMP, "IPcomp", 627 ipcomp_init, ipcomp_zeroize, ipcomp_input, 628 ipcomp_output 629 }; 630 631 static void 632 ipcomp_attach(void) 633 { 634 635 xform_register(&ipcomp_xformsw); 636 } 637 638 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL);
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