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_INT(_net_inet_ipcomp, OID_AUTO, ipcomp_enable, 81 CTLFLAG_VNET | 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 mbuf *m; 231 struct secasvar *sav; 232 struct secasindex *saidx; 233 int hlen = IPCOMP_HLENGTH, error, clen; 234 u_int8_t nproto; 235 caddr_t addr; 236 237 crd = crp->crp_desc; 238 239 tc = (struct tdb_crypto *) crp->crp_opaque; 240 IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!")); 241 skip = tc->tc_skip; 242 protoff = tc->tc_protoff; 243 m = (struct mbuf *) crp->crp_buf; 244 245 sav = tc->tc_sav; 246 IPSEC_ASSERT(sav != NULL, ("null SA!")); 247 248 saidx = &sav->sah->saidx; 249 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 250 saidx->dst.sa.sa_family == AF_INET6, 251 ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 252 253 /* Check for crypto errors */ 254 if (crp->crp_etype) { 255 /* Reset the session ID */ 256 if (sav->tdb_cryptoid != 0) 257 sav->tdb_cryptoid = crp->crp_sid; 258 259 if (crp->crp_etype == EAGAIN) { 260 return crypto_dispatch(crp); 261 } 262 IPCOMPSTAT_INC(ipcomps_noxform); 263 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 264 error = crp->crp_etype; 265 goto bad; 266 } 267 /* Shouldn't happen... */ 268 if (m == NULL) { 269 IPCOMPSTAT_INC(ipcomps_crypto); 270 DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 271 error = EINVAL; 272 goto bad; 273 } 274 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 275 276 clen = crp->crp_olen; /* Length of data after processing */ 277 278 /* Release the crypto descriptors */ 279 free(tc, M_XDATA), tc = NULL; 280 crypto_freereq(crp), crp = NULL; 281 282 /* In case it's not done already, adjust the size of the mbuf chain */ 283 m->m_pkthdr.len = clen + hlen + skip; 284 285 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { 286 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 287 DPRINTF(("%s: m_pullup failed\n", __func__)); 288 error = EINVAL; /*XXX*/ 289 goto bad; 290 } 291 292 /* Keep the next protocol field */ 293 addr = (caddr_t) mtod(m, struct ip *) + skip; 294 nproto = ((struct ipcomp *) addr)->comp_nxt; 295 296 /* Remove the IPCOMP header */ 297 error = m_striphdr(m, skip, hlen); 298 if (error) { 299 IPCOMPSTAT_INC(ipcomps_hdrops); 300 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 301 ipsec_address(&sav->sah->saidx.dst), 302 (u_long) ntohl(sav->spi))); 303 goto bad; 304 } 305 306 /* Restore the Next Protocol field */ 307 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 308 309 switch (saidx->dst.sa.sa_family) { 310 #ifdef INET6 311 case AF_INET6: 312 error = ipsec6_common_input_cb(m, sav, skip, protoff); 313 break; 314 #endif 315 #ifdef INET 316 case AF_INET: 317 error = ipsec4_common_input_cb(m, sav, skip, protoff); 318 break; 319 #endif 320 default: 321 panic("%s: Unexpected address family: %d saidx=%p", __func__, 322 saidx->dst.sa.sa_family, saidx); 323 } 324 325 KEY_FREESAV(&sav); 326 return error; 327 bad: 328 if (sav) 329 KEY_FREESAV(&sav); 330 if (m) 331 m_freem(m); 332 if (tc != NULL) 333 free(tc, M_XDATA); 334 if (crp) 335 crypto_freereq(crp); 336 return error; 337 } 338 339 /* 340 * IPComp output routine, called by ipsec[46]_process_packet() 341 */ 342 static int 343 ipcomp_output( 344 struct mbuf *m, 345 struct ipsecrequest *isr, 346 struct mbuf **mp, 347 int skip, 348 int protoff 349 ) 350 { 351 struct secasvar *sav; 352 struct comp_algo *ipcompx; 353 int error, ralen, maxpacketsize; 354 struct cryptodesc *crdc; 355 struct cryptop *crp; 356 struct tdb_crypto *tc; 357 358 sav = isr->sav; 359 IPSEC_ASSERT(sav != NULL, ("null SA")); 360 ipcompx = sav->tdb_compalgxform; 361 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 362 363 /* 364 * Do not touch the packet in case our payload to compress 365 * is lower than the minimal threshold of the compression 366 * alogrithm. We will just send out the data uncompressed. 367 * See RFC 3173, 2.2. Non-Expansion Policy. 368 */ 369 if (m->m_pkthdr.len <= ipcompx->minlen) { 370 IPCOMPSTAT_INC(ipcomps_threshold); 371 return ipsec_process_done(m, isr); 372 } 373 374 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 375 IPCOMPSTAT_INC(ipcomps_output); 376 377 /* Check for maximum packet size violations. */ 378 switch (sav->sah->saidx.dst.sa.sa_family) { 379 #ifdef INET 380 case AF_INET: 381 maxpacketsize = IP_MAXPACKET; 382 break; 383 #endif /* INET */ 384 #ifdef INET6 385 case AF_INET6: 386 maxpacketsize = IPV6_MAXPACKET; 387 break; 388 #endif /* INET6 */ 389 default: 390 IPCOMPSTAT_INC(ipcomps_nopf); 391 DPRINTF(("%s: unknown/unsupported protocol family %d, " 392 "IPCA %s/%08lx\n", __func__, 393 sav->sah->saidx.dst.sa.sa_family, 394 ipsec_address(&sav->sah->saidx.dst), 395 (u_long) ntohl(sav->spi))); 396 error = EPFNOSUPPORT; 397 goto bad; 398 } 399 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 400 IPCOMPSTAT_INC(ipcomps_toobig); 401 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 402 "(len %u, max len %u)\n", __func__, 403 ipsec_address(&sav->sah->saidx.dst), 404 (u_long) ntohl(sav->spi), 405 ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 406 error = EMSGSIZE; 407 goto bad; 408 } 409 410 /* Update the counters */ 411 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip); 412 413 m = m_unshare(m, M_NOWAIT); 414 if (m == NULL) { 415 IPCOMPSTAT_INC(ipcomps_hdrops); 416 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 417 __func__, ipsec_address(&sav->sah->saidx.dst), 418 (u_long) ntohl(sav->spi))); 419 error = ENOBUFS; 420 goto bad; 421 } 422 423 /* Ok now, we can pass to the crypto processing. */ 424 425 /* Get crypto descriptors */ 426 crp = crypto_getreq(1); 427 if (crp == NULL) { 428 IPCOMPSTAT_INC(ipcomps_crypto); 429 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 430 error = ENOBUFS; 431 goto bad; 432 } 433 crdc = crp->crp_desc; 434 435 /* Compression descriptor */ 436 crdc->crd_skip = skip; 437 crdc->crd_len = ralen; 438 crdc->crd_flags = CRD_F_COMP; 439 crdc->crd_inject = skip; 440 441 /* Compression operation */ 442 crdc->crd_alg = ipcompx->type; 443 444 /* IPsec-specific opaque crypto info */ 445 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto), 446 M_XDATA, M_NOWAIT|M_ZERO); 447 if (tc == NULL) { 448 IPCOMPSTAT_INC(ipcomps_crypto); 449 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__)); 450 crypto_freereq(crp); 451 error = ENOBUFS; 452 goto bad; 453 } 454 455 tc->tc_isr = isr; 456 KEY_ADDREFSA(sav); 457 tc->tc_sav = sav; 458 tc->tc_spi = sav->spi; 459 tc->tc_dst = sav->sah->saidx.dst; 460 tc->tc_proto = sav->sah->saidx.proto; 461 tc->tc_protoff = protoff; 462 tc->tc_skip = skip; 463 464 /* Crypto operation descriptor */ 465 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 466 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 467 crp->crp_buf = (caddr_t) m; 468 crp->crp_callback = ipcomp_output_cb; 469 crp->crp_opaque = (caddr_t) tc; 470 crp->crp_sid = sav->tdb_cryptoid; 471 472 return crypto_dispatch(crp); 473 bad: 474 if (m) 475 m_freem(m); 476 return (error); 477 } 478 479 /* 480 * IPComp output callback from the crypto driver. 481 */ 482 static int 483 ipcomp_output_cb(struct cryptop *crp) 484 { 485 struct tdb_crypto *tc; 486 struct ipsecrequest *isr; 487 struct secasvar *sav; 488 struct mbuf *m; 489 int error, skip; 490 491 tc = (struct tdb_crypto *) crp->crp_opaque; 492 IPSEC_ASSERT(tc != NULL, ("null opaque data area!")); 493 m = (struct mbuf *) crp->crp_buf; 494 skip = tc->tc_skip; 495 496 isr = tc->tc_isr; 497 IPSECREQUEST_LOCK(isr); 498 sav = tc->tc_sav; 499 /* With the isr lock released SA pointer can be updated. */ 500 if (sav != isr->sav) { 501 IPCOMPSTAT_INC(ipcomps_notdb); 502 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 503 error = ENOBUFS; /*XXX*/ 504 goto bad; 505 } 506 507 /* Check for crypto errors */ 508 if (crp->crp_etype) { 509 /* Reset the session ID */ 510 if (sav->tdb_cryptoid != 0) 511 sav->tdb_cryptoid = crp->crp_sid; 512 513 if (crp->crp_etype == EAGAIN) { 514 IPSECREQUEST_UNLOCK(isr); 515 return crypto_dispatch(crp); 516 } 517 IPCOMPSTAT_INC(ipcomps_noxform); 518 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 519 error = crp->crp_etype; 520 goto bad; 521 } 522 /* Shouldn't happen... */ 523 if (m == NULL) { 524 IPCOMPSTAT_INC(ipcomps_crypto); 525 DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 526 error = EINVAL; 527 goto bad; 528 } 529 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 530 531 if (crp->crp_ilen - skip > crp->crp_olen) { 532 struct mbuf *mo; 533 struct ipcomp *ipcomp; 534 int roff; 535 uint8_t prot; 536 537 /* Compression helped, inject IPCOMP header. */ 538 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 539 if (mo == NULL) { 540 IPCOMPSTAT_INC(ipcomps_wrap); 541 DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n", 542 __func__, ipsec_address(&sav->sah->saidx.dst), 543 (u_long) ntohl(sav->spi))); 544 error = ENOBUFS; 545 goto bad; 546 } 547 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 548 549 /* Initialize the IPCOMP header */ 550 /* XXX alignment always correct? */ 551 switch (sav->sah->saidx.dst.sa.sa_family) { 552 #ifdef INET 553 case AF_INET: 554 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 555 break; 556 #endif /* INET */ 557 #ifdef INET6 558 case AF_INET6: 559 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 560 break; 561 #endif 562 } 563 ipcomp->comp_flags = 0; 564 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 565 566 /* Fix Next Protocol in IPv4/IPv6 header */ 567 prot = IPPROTO_IPCOMP; 568 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t), 569 (u_char *)&prot); 570 571 /* Adjust the length in the IP header */ 572 switch (sav->sah->saidx.dst.sa.sa_family) { 573 #ifdef INET 574 case AF_INET: 575 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 576 break; 577 #endif /* INET */ 578 #ifdef INET6 579 case AF_INET6: 580 mtod(m, struct ip6_hdr *)->ip6_plen = 581 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 582 break; 583 #endif /* INET6 */ 584 default: 585 IPCOMPSTAT_INC(ipcomps_nopf); 586 DPRINTF(("%s: unknown/unsupported protocol " 587 "family %d, IPCA %s/%08lx\n", __func__, 588 sav->sah->saidx.dst.sa.sa_family, 589 ipsec_address(&sav->sah->saidx.dst), 590 (u_long) ntohl(sav->spi))); 591 error = EPFNOSUPPORT; 592 goto bad; 593 } 594 } else { 595 /* Compression was useless, we have lost time. */ 596 IPCOMPSTAT_INC(ipcomps_uncompr); 597 DPRINTF(("%s: compressions was useless %d - %d <= %d\n", 598 __func__, crp->crp_ilen, skip, crp->crp_olen)); 599 /* XXX remember state to not compress the next couple 600 * of packets, RFC 3173, 2.2. Non-Expansion Policy */ 601 } 602 603 /* Release the crypto descriptor */ 604 free(tc, M_XDATA); 605 crypto_freereq(crp); 606 607 /* NB: m is reclaimed by ipsec_process_done. */ 608 error = ipsec_process_done(m, isr); 609 KEY_FREESAV(&sav); 610 IPSECREQUEST_UNLOCK(isr); 611 return error; 612 bad: 613 if (sav) 614 KEY_FREESAV(&sav); 615 IPSECREQUEST_UNLOCK(isr); 616 if (m) 617 m_freem(m); 618 free(tc, M_XDATA); 619 crypto_freereq(crp); 620 return error; 621 } 622 623 static struct xformsw ipcomp_xformsw = { 624 XF_IPCOMP, XFT_COMP, "IPcomp", 625 ipcomp_init, ipcomp_zeroize, ipcomp_input, 626 ipcomp_output 627 }; 628 629 static void 630 ipcomp_attach(void) 631 { 632 633 xform_register(&ipcomp_xformsw); 634 } 635 636 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL); 637