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/socket.h> 41 #include <sys/kernel.h> 42 #include <sys/protosw.h> 43 #include <sys/sysctl.h> 44 45 #include <netinet/in.h> 46 #include <netinet/in_systm.h> 47 #include <netinet/ip.h> 48 #include <netinet/ip_var.h> 49 50 #include <net/route.h> 51 #include <netipsec/ipsec.h> 52 #include <netipsec/xform.h> 53 54 #ifdef INET6 55 #include <netinet/ip6.h> 56 #include <netipsec/ipsec6.h> 57 #endif 58 59 #include <netipsec/ipcomp.h> 60 #include <netipsec/ipcomp_var.h> 61 62 #include <netipsec/key.h> 63 #include <netipsec/key_debug.h> 64 65 #include <opencrypto/cryptodev.h> 66 #include <opencrypto/deflate.h> 67 #include <opencrypto/xform.h> 68 69 int ipcomp_enable = 1; 70 struct ipcompstat ipcompstat; 71 72 SYSCTL_DECL(_net_inet_ipcomp); 73 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, 74 ipcomp_enable, CTLFLAG_RW, &ipcomp_enable, 0, ""); 75 SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS, 76 stats, CTLFLAG_RD, &ipcompstat, ipcompstat, ""); 77 78 static int ipcomp_input_cb(struct cryptop *crp); 79 static int ipcomp_output_cb(struct cryptop *crp); 80 81 struct comp_algo * 82 ipcomp_algorithm_lookup(int alg) 83 { 84 if (alg >= IPCOMP_ALG_MAX) 85 return NULL; 86 switch (alg) { 87 case SADB_X_CALG_DEFLATE: 88 return &comp_algo_deflate; 89 } 90 return NULL; 91 } 92 93 /* 94 * ipcomp_init() is called when an CPI is being set up. 95 */ 96 static int 97 ipcomp_init(struct secasvar *sav, struct xformsw *xsp) 98 { 99 struct comp_algo *tcomp; 100 struct cryptoini cric; 101 102 /* NB: algorithm really comes in alg_enc and not alg_comp! */ 103 tcomp = ipcomp_algorithm_lookup(sav->alg_enc); 104 if (tcomp == NULL) { 105 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__, 106 sav->alg_comp)); 107 return EINVAL; 108 } 109 sav->alg_comp = sav->alg_enc; /* set for doing histogram */ 110 sav->tdb_xform = xsp; 111 sav->tdb_compalgxform = tcomp; 112 113 /* Initialize crypto session */ 114 bzero(&cric, sizeof (cric)); 115 cric.cri_alg = sav->tdb_compalgxform->type; 116 117 return crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support); 118 } 119 120 /* 121 * ipcomp_zeroize() used when IPCA is deleted 122 */ 123 static int 124 ipcomp_zeroize(struct secasvar *sav) 125 { 126 int err; 127 128 err = crypto_freesession(sav->tdb_cryptoid); 129 sav->tdb_cryptoid = 0; 130 return err; 131 } 132 133 /* 134 * ipcomp_input() gets called to uncompress an input packet 135 */ 136 static int 137 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 138 { 139 struct tdb_crypto *tc; 140 struct cryptodesc *crdc; 141 struct cryptop *crp; 142 struct ipcomp *ipcomp; 143 caddr_t addr; 144 int hlen = IPCOMP_HLENGTH; 145 146 IPSEC_SPLASSERT_SOFTNET(__func__); 147 148 /* 149 * Check that the next header of the IPComp is not IPComp again, before 150 * doing any real work. Given it is not possible to do double 151 * compression it means someone is playing tricks on us. 152 */ 153 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 154 ipcompstat.ipcomps_hdrops++; /*XXX*/ 155 DPRINTF(("%s: m_pullup failed\n", __func__)); 156 return (ENOBUFS); 157 } 158 addr = (caddr_t) mtod(m, struct ip *) + skip; 159 ipcomp = (struct ipcomp *)addr; 160 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) { 161 m_freem(m); 162 ipcompstat.ipcomps_pdrops++; /* XXX have our own stats? */ 163 DPRINTF(("%s: recursive compression detected\n", __func__)); 164 return (EINVAL); 165 } 166 167 /* Get crypto descriptors */ 168 crp = crypto_getreq(1); 169 if (crp == NULL) { 170 m_freem(m); 171 DPRINTF(("%s: no crypto descriptors\n", __func__)); 172 ipcompstat.ipcomps_crypto++; 173 return ENOBUFS; 174 } 175 /* Get IPsec-specific opaque pointer */ 176 tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO); 177 if (tc == NULL) { 178 m_freem(m); 179 crypto_freereq(crp); 180 DPRINTF(("%s: cannot allocate tdb_crypto\n", __func__)); 181 ipcompstat.ipcomps_crypto++; 182 return ENOBUFS; 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 = skip; 189 190 tc->tc_ptr = 0; 191 192 /* Decompression operation */ 193 crdc->crd_alg = sav->tdb_compalgxform->type; 194 195 /* Crypto operation descriptor */ 196 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 197 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 198 crp->crp_buf = (caddr_t) m; 199 crp->crp_callback = ipcomp_input_cb; 200 crp->crp_sid = sav->tdb_cryptoid; 201 crp->crp_opaque = (caddr_t) tc; 202 203 /* These are passed as-is to the callback */ 204 tc->tc_spi = sav->spi; 205 tc->tc_dst = sav->sah->saidx.dst; 206 tc->tc_proto = sav->sah->saidx.proto; 207 tc->tc_protoff = protoff; 208 tc->tc_skip = skip; 209 210 return crypto_dispatch(crp); 211 } 212 213 #ifdef INET6 214 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \ 215 if (saidx->dst.sa.sa_family == AF_INET6) { \ 216 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \ 217 } else { \ 218 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \ 219 } \ 220 } while (0) 221 #else 222 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \ 223 (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag)) 224 #endif 225 226 /* 227 * IPComp input callback from the crypto driver. 228 */ 229 static int 230 ipcomp_input_cb(struct cryptop *crp) 231 { 232 struct cryptodesc *crd; 233 struct tdb_crypto *tc; 234 int skip, protoff; 235 struct mtag *mtag; 236 struct mbuf *m; 237 struct secasvar *sav; 238 struct secasindex *saidx; 239 int hlen = IPCOMP_HLENGTH, error, clen; 240 u_int8_t nproto; 241 caddr_t addr; 242 243 NET_LOCK_GIANT(); 244 245 crd = crp->crp_desc; 246 247 tc = (struct tdb_crypto *) crp->crp_opaque; 248 IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!")); 249 skip = tc->tc_skip; 250 protoff = tc->tc_protoff; 251 mtag = (struct mtag *) tc->tc_ptr; 252 m = (struct mbuf *) crp->crp_buf; 253 254 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi); 255 if (sav == NULL) { 256 ipcompstat.ipcomps_notdb++; 257 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 258 error = ENOBUFS; /*XXX*/ 259 goto bad; 260 } 261 262 saidx = &sav->sah->saidx; 263 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 264 saidx->dst.sa.sa_family == AF_INET6, 265 ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 266 267 /* Check for crypto errors */ 268 if (crp->crp_etype) { 269 /* Reset the session ID */ 270 if (sav->tdb_cryptoid != 0) 271 sav->tdb_cryptoid = crp->crp_sid; 272 273 if (crp->crp_etype == EAGAIN) { 274 KEY_FREESAV(&sav); 275 error = crypto_dispatch(crp); 276 NET_UNLOCK_GIANT(); 277 return error; 278 } 279 ipcompstat.ipcomps_noxform++; 280 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 281 error = crp->crp_etype; 282 goto bad; 283 } 284 /* Shouldn't happen... */ 285 if (m == NULL) { 286 ipcompstat.ipcomps_crypto++; 287 DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 288 error = EINVAL; 289 goto bad; 290 } 291 ipcompstat.ipcomps_hist[sav->alg_comp]++; 292 293 clen = crp->crp_olen; /* Length of data after processing */ 294 295 /* Release the crypto descriptors */ 296 free(tc, M_XDATA), tc = NULL; 297 crypto_freereq(crp), crp = NULL; 298 299 /* In case it's not done already, adjust the size of the mbuf chain */ 300 m->m_pkthdr.len = clen + hlen + skip; 301 302 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { 303 ipcompstat.ipcomps_hdrops++; /*XXX*/ 304 DPRINTF(("%s: m_pullup failed\n", __func__)); 305 error = EINVAL; /*XXX*/ 306 goto bad; 307 } 308 309 /* Keep the next protocol field */ 310 addr = (caddr_t) mtod(m, struct ip *) + skip; 311 nproto = ((struct ipcomp *) addr)->comp_nxt; 312 313 /* Remove the IPCOMP header */ 314 error = m_striphdr(m, skip, hlen); 315 if (error) { 316 ipcompstat.ipcomps_hdrops++; 317 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 318 ipsec_address(&sav->sah->saidx.dst), 319 (u_long) ntohl(sav->spi))); 320 goto bad; 321 } 322 323 /* Restore the Next Protocol field */ 324 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 325 326 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL); 327 328 KEY_FREESAV(&sav); 329 NET_UNLOCK_GIANT(); 330 return error; 331 bad: 332 if (sav) 333 KEY_FREESAV(&sav); 334 if (m) 335 m_freem(m); 336 if (tc != NULL) 337 free(tc, M_XDATA); 338 if (crp) 339 crypto_freereq(crp); 340 NET_UNLOCK_GIANT(); 341 return error; 342 } 343 344 /* 345 * IPComp output routine, called by ipsec[46]_process_packet() 346 */ 347 static int 348 ipcomp_output( 349 struct mbuf *m, 350 struct ipsecrequest *isr, 351 struct mbuf **mp, 352 int skip, 353 int protoff 354 ) 355 { 356 struct secasvar *sav; 357 struct comp_algo *ipcompx; 358 int error, ralen, maxpacketsize; 359 struct cryptodesc *crdc; 360 struct cryptop *crp; 361 struct tdb_crypto *tc; 362 363 IPSEC_SPLASSERT_SOFTNET(__func__); 364 365 sav = isr->sav; 366 IPSEC_ASSERT(sav != NULL, ("null SA")); 367 ipcompx = sav->tdb_compalgxform; 368 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 369 370 /* 371 * Do not touch the packet in case our payload to compress 372 * is lower than the minimal threshold of the compression 373 * alogrithm. We will just send out the data uncompressed. 374 * See RFC 3173, 2.2. Non-Expansion Policy. 375 */ 376 if (m->m_pkthdr.len <= ipcompx->minlen) { 377 /* XXX-BZ V_ipcompstat.threshold++; */ 378 return ipsec_process_done(m, isr); 379 } 380 381 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 382 ipcompstat.ipcomps_output++; 383 384 /* Check for maximum packet size violations. */ 385 switch (sav->sah->saidx.dst.sa.sa_family) { 386 #ifdef INET 387 case AF_INET: 388 maxpacketsize = IP_MAXPACKET; 389 break; 390 #endif /* INET */ 391 #ifdef INET6 392 case AF_INET6: 393 maxpacketsize = IPV6_MAXPACKET; 394 break; 395 #endif /* INET6 */ 396 default: 397 ipcompstat.ipcomps_nopf++; 398 DPRINTF(("%s: unknown/unsupported protocol family %d, " 399 "IPCA %s/%08lx\n", __func__, 400 sav->sah->saidx.dst.sa.sa_family, 401 ipsec_address(&sav->sah->saidx.dst), 402 (u_long) ntohl(sav->spi))); 403 error = EPFNOSUPPORT; 404 goto bad; 405 } 406 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 407 ipcompstat.ipcomps_toobig++; 408 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 409 "(len %u, max len %u)\n", __func__, 410 ipsec_address(&sav->sah->saidx.dst), 411 (u_long) ntohl(sav->spi), 412 ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 413 error = EMSGSIZE; 414 goto bad; 415 } 416 417 /* Update the counters */ 418 ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip; 419 420 m = m_unshare(m, M_NOWAIT); 421 if (m == NULL) { 422 ipcompstat.ipcomps_hdrops++; 423 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 424 __func__, ipsec_address(&sav->sah->saidx.dst), 425 (u_long) ntohl(sav->spi))); 426 error = ENOBUFS; 427 goto bad; 428 } 429 430 /* Ok now, we can pass to the crypto processing. */ 431 432 /* Get crypto descriptors */ 433 crp = crypto_getreq(1); 434 if (crp == NULL) { 435 ipcompstat.ipcomps_crypto++; 436 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 437 error = ENOBUFS; 438 goto bad; 439 } 440 crdc = crp->crp_desc; 441 442 /* Compression descriptor */ 443 crdc->crd_skip = skip; 444 crdc->crd_len = ralen; 445 crdc->crd_flags = CRD_F_COMP; 446 crdc->crd_inject = skip; 447 448 /* Compression operation */ 449 crdc->crd_alg = ipcompx->type; 450 451 /* IPsec-specific opaque crypto info */ 452 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto), 453 M_XDATA, M_NOWAIT|M_ZERO); 454 if (tc == NULL) { 455 ipcompstat.ipcomps_crypto++; 456 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__)); 457 crypto_freereq(crp); 458 error = ENOBUFS; 459 goto bad; 460 } 461 462 tc->tc_isr = isr; 463 tc->tc_spi = sav->spi; 464 tc->tc_dst = sav->sah->saidx.dst; 465 tc->tc_proto = sav->sah->saidx.proto; 466 tc->tc_protoff = protoff; 467 tc->tc_skip = skip; 468 469 /* Crypto operation descriptor */ 470 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 471 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 472 crp->crp_buf = (caddr_t) m; 473 crp->crp_callback = ipcomp_output_cb; 474 crp->crp_opaque = (caddr_t) tc; 475 crp->crp_sid = sav->tdb_cryptoid; 476 477 return crypto_dispatch(crp); 478 bad: 479 if (m) 480 m_freem(m); 481 return (error); 482 } 483 484 /* 485 * IPComp output callback from the crypto driver. 486 */ 487 static int 488 ipcomp_output_cb(struct cryptop *crp) 489 { 490 struct tdb_crypto *tc; 491 struct ipsecrequest *isr; 492 struct secasvar *sav; 493 struct mbuf *m; 494 int error, skip; 495 496 NET_LOCK_GIANT(); 497 498 tc = (struct tdb_crypto *) crp->crp_opaque; 499 IPSEC_ASSERT(tc != NULL, ("null opaque data area!")); 500 m = (struct mbuf *) crp->crp_buf; 501 skip = tc->tc_skip; 502 503 isr = tc->tc_isr; 504 IPSECREQUEST_LOCK(isr); 505 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi); 506 if (sav == NULL) { 507 ipcompstat.ipcomps_notdb++; 508 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 509 error = ENOBUFS; /*XXX*/ 510 goto bad; 511 } 512 IPSEC_ASSERT(isr->sav == sav, ("SA changed\n")); 513 514 /* Check for crypto errors */ 515 if (crp->crp_etype) { 516 /* Reset the session ID */ 517 if (sav->tdb_cryptoid != 0) 518 sav->tdb_cryptoid = crp->crp_sid; 519 520 if (crp->crp_etype == EAGAIN) { 521 KEY_FREESAV(&sav); 522 IPSECREQUEST_UNLOCK(isr); 523 error = crypto_dispatch(crp); 524 NET_UNLOCK_GIANT(); 525 return error; 526 } 527 ipcompstat.ipcomps_noxform++; 528 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 529 error = crp->crp_etype; 530 goto bad; 531 } 532 /* Shouldn't happen... */ 533 if (m == NULL) { 534 ipcompstat.ipcomps_crypto++; 535 DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 536 error = EINVAL; 537 goto bad; 538 } 539 ipcompstat.ipcomps_hist[sav->alg_comp]++; 540 541 if (crp->crp_ilen - skip > crp->crp_olen) { 542 struct mbuf *mo; 543 struct ipcomp *ipcomp; 544 int roff; 545 uint8_t prot; 546 547 /* Compression helped, inject IPCOMP header. */ 548 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 549 if (mo == NULL) { 550 ipcompstat.ipcomps_wrap++; 551 DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n", 552 __func__, ipsec_address(&sav->sah->saidx.dst), 553 (u_long) ntohl(sav->spi))); 554 error = ENOBUFS; 555 goto bad; 556 } 557 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 558 559 /* Initialize the IPCOMP header */ 560 /* XXX alignment always correct? */ 561 switch (sav->sah->saidx.dst.sa.sa_family) { 562 #ifdef INET 563 case AF_INET: 564 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 565 break; 566 #endif /* INET */ 567 #ifdef INET6 568 case AF_INET6: 569 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 570 break; 571 #endif 572 } 573 ipcomp->comp_flags = 0; 574 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 575 576 /* Fix Next Protocol in IPv4/IPv6 header */ 577 prot = IPPROTO_IPCOMP; 578 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t), 579 (u_char *)&prot); 580 581 /* Adjust the length in the IP header */ 582 switch (sav->sah->saidx.dst.sa.sa_family) { 583 #ifdef INET 584 case AF_INET: 585 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 586 break; 587 #endif /* INET */ 588 #ifdef INET6 589 case AF_INET6: 590 mtod(m, struct ip6_hdr *)->ip6_plen = 591 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 592 break; 593 #endif /* INET6 */ 594 default: 595 ipcompstat.ipcomps_nopf++; 596 DPRINTF(("%s: unknown/unsupported protocol " 597 "family %d, IPCA %s/%08lx\n", __func__, 598 sav->sah->saidx.dst.sa.sa_family, 599 ipsec_address(&sav->sah->saidx.dst), 600 (u_long) ntohl(sav->spi))); 601 error = EPFNOSUPPORT; 602 goto bad; 603 } 604 } else { 605 /* compression was useless, we have lost time */ 606 /* XXX add statistic */ 607 /* XXX remember state to not compress the next couple 608 * of packets, RFC 3173, 2.2. Non-Expansion Policy */ 609 } 610 611 /* Release the crypto descriptor */ 612 free(tc, M_XDATA); 613 crypto_freereq(crp); 614 615 /* NB: m is reclaimed by ipsec_process_done. */ 616 error = ipsec_process_done(m, isr); 617 KEY_FREESAV(&sav); 618 IPSECREQUEST_UNLOCK(isr); 619 NET_UNLOCK_GIANT(); 620 return error; 621 bad: 622 if (sav) 623 KEY_FREESAV(&sav); 624 IPSECREQUEST_UNLOCK(isr); 625 if (m) 626 m_freem(m); 627 free(tc, M_XDATA); 628 crypto_freereq(crp); 629 NET_UNLOCK_GIANT(); 630 return error; 631 } 632 633 static struct xformsw ipcomp_xformsw = { 634 XF_IPCOMP, XFT_COMP, "IPcomp", 635 ipcomp_init, ipcomp_zeroize, ipcomp_input, 636 ipcomp_output 637 }; 638 639 static void 640 ipcomp_attach(void) 641 { 642 xform_register(&ipcomp_xformsw); 643 } 644 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL);
Cache object: c598ed004633258c12e8ebca71c33821
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