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 crd = crp->crp_desc; 244 245 tc = (struct tdb_crypto *) crp->crp_opaque; 246 IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!")); 247 skip = tc->tc_skip; 248 protoff = tc->tc_protoff; 249 mtag = (struct mtag *) tc->tc_ptr; 250 m = (struct mbuf *) crp->crp_buf; 251 252 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi); 253 if (sav == NULL) { 254 ipcompstat.ipcomps_notdb++; 255 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 256 error = ENOBUFS; /*XXX*/ 257 goto bad; 258 } 259 260 saidx = &sav->sah->saidx; 261 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 262 saidx->dst.sa.sa_family == AF_INET6, 263 ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 264 265 /* Check for crypto errors */ 266 if (crp->crp_etype) { 267 /* Reset the session ID */ 268 if (sav->tdb_cryptoid != 0) 269 sav->tdb_cryptoid = crp->crp_sid; 270 271 if (crp->crp_etype == EAGAIN) { 272 KEY_FREESAV(&sav); 273 return crypto_dispatch(crp); 274 } 275 ipcompstat.ipcomps_noxform++; 276 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 277 error = crp->crp_etype; 278 goto bad; 279 } 280 /* Shouldn't happen... */ 281 if (m == NULL) { 282 ipcompstat.ipcomps_crypto++; 283 DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 284 error = EINVAL; 285 goto bad; 286 } 287 ipcompstat.ipcomps_hist[sav->alg_comp]++; 288 289 clen = crp->crp_olen; /* Length of data after processing */ 290 291 /* Release the crypto descriptors */ 292 free(tc, M_XDATA), tc = NULL; 293 crypto_freereq(crp), crp = NULL; 294 295 /* In case it's not done already, adjust the size of the mbuf chain */ 296 m->m_pkthdr.len = clen + hlen + skip; 297 298 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { 299 ipcompstat.ipcomps_hdrops++; /*XXX*/ 300 DPRINTF(("%s: m_pullup failed\n", __func__)); 301 error = EINVAL; /*XXX*/ 302 goto bad; 303 } 304 305 /* Keep the next protocol field */ 306 addr = (caddr_t) mtod(m, struct ip *) + skip; 307 nproto = ((struct ipcomp *) addr)->comp_nxt; 308 309 /* Remove the IPCOMP header */ 310 error = m_striphdr(m, skip, hlen); 311 if (error) { 312 ipcompstat.ipcomps_hdrops++; 313 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 314 ipsec_address(&sav->sah->saidx.dst), 315 (u_long) ntohl(sav->spi))); 316 goto bad; 317 } 318 319 /* Restore the Next Protocol field */ 320 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 321 322 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL); 323 324 KEY_FREESAV(&sav); 325 return error; 326 bad: 327 if (sav) 328 KEY_FREESAV(&sav); 329 if (m) 330 m_freem(m); 331 if (tc != NULL) 332 free(tc, M_XDATA); 333 if (crp) 334 crypto_freereq(crp); 335 return error; 336 } 337 338 /* 339 * IPComp output routine, called by ipsec[46]_process_packet() 340 */ 341 static int 342 ipcomp_output( 343 struct mbuf *m, 344 struct ipsecrequest *isr, 345 struct mbuf **mp, 346 int skip, 347 int protoff 348 ) 349 { 350 struct secasvar *sav; 351 struct comp_algo *ipcompx; 352 int error, ralen, maxpacketsize; 353 struct cryptodesc *crdc; 354 struct cryptop *crp; 355 struct tdb_crypto *tc; 356 357 IPSEC_SPLASSERT_SOFTNET(__func__); 358 359 sav = isr->sav; 360 IPSEC_ASSERT(sav != NULL, ("null SA")); 361 ipcompx = sav->tdb_compalgxform; 362 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 363 364 /* 365 * Do not touch the packet in case our payload to compress 366 * is lower than the minimal threshold of the compression 367 * alogrithm. We will just send out the data uncompressed. 368 * See RFC 3173, 2.2. Non-Expansion Policy. 369 */ 370 if (m->m_pkthdr.len <= ipcompx->minlen) { 371 ipcompstat.ipcomps_threshold++; 372 return ipsec_process_done(m, isr); 373 } 374 375 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 376 ipcompstat.ipcomps_output++; 377 378 /* Check for maximum packet size violations. */ 379 switch (sav->sah->saidx.dst.sa.sa_family) { 380 #ifdef INET 381 case AF_INET: 382 maxpacketsize = IP_MAXPACKET; 383 break; 384 #endif /* INET */ 385 #ifdef INET6 386 case AF_INET6: 387 maxpacketsize = IPV6_MAXPACKET; 388 break; 389 #endif /* INET6 */ 390 default: 391 ipcompstat.ipcomps_nopf++; 392 DPRINTF(("%s: unknown/unsupported protocol family %d, " 393 "IPCA %s/%08lx\n", __func__, 394 sav->sah->saidx.dst.sa.sa_family, 395 ipsec_address(&sav->sah->saidx.dst), 396 (u_long) ntohl(sav->spi))); 397 error = EPFNOSUPPORT; 398 goto bad; 399 } 400 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 401 ipcompstat.ipcomps_toobig++; 402 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 403 "(len %u, max len %u)\n", __func__, 404 ipsec_address(&sav->sah->saidx.dst), 405 (u_long) ntohl(sav->spi), 406 ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 407 error = EMSGSIZE; 408 goto bad; 409 } 410 411 /* Update the counters */ 412 ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip; 413 414 m = m_unshare(m, M_NOWAIT); 415 if (m == NULL) { 416 ipcompstat.ipcomps_hdrops++; 417 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 418 __func__, ipsec_address(&sav->sah->saidx.dst), 419 (u_long) ntohl(sav->spi))); 420 error = ENOBUFS; 421 goto bad; 422 } 423 424 /* Ok now, we can pass to the crypto processing. */ 425 426 /* Get crypto descriptors */ 427 crp = crypto_getreq(1); 428 if (crp == NULL) { 429 ipcompstat.ipcomps_crypto++; 430 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 431 error = ENOBUFS; 432 goto bad; 433 } 434 crdc = crp->crp_desc; 435 436 /* Compression descriptor */ 437 crdc->crd_skip = skip; 438 crdc->crd_len = ralen; 439 crdc->crd_flags = CRD_F_COMP; 440 crdc->crd_inject = skip; 441 442 /* Compression operation */ 443 crdc->crd_alg = ipcompx->type; 444 445 /* IPsec-specific opaque crypto info */ 446 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto), 447 M_XDATA, M_NOWAIT|M_ZERO); 448 if (tc == NULL) { 449 ipcompstat.ipcomps_crypto++; 450 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__)); 451 crypto_freereq(crp); 452 error = ENOBUFS; 453 goto bad; 454 } 455 456 tc->tc_isr = isr; 457 tc->tc_spi = sav->spi; 458 tc->tc_dst = sav->sah->saidx.dst; 459 tc->tc_proto = sav->sah->saidx.proto; 460 tc->tc_protoff = protoff; 461 tc->tc_skip = skip; 462 463 /* Crypto operation descriptor */ 464 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 465 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 466 crp->crp_buf = (caddr_t) m; 467 crp->crp_callback = ipcomp_output_cb; 468 crp->crp_opaque = (caddr_t) tc; 469 crp->crp_sid = sav->tdb_cryptoid; 470 471 return crypto_dispatch(crp); 472 bad: 473 if (m) 474 m_freem(m); 475 return (error); 476 } 477 478 /* 479 * IPComp output callback from the crypto driver. 480 */ 481 static int 482 ipcomp_output_cb(struct cryptop *crp) 483 { 484 struct tdb_crypto *tc; 485 struct ipsecrequest *isr; 486 struct secasvar *sav; 487 struct mbuf *m; 488 int error, skip; 489 490 tc = (struct tdb_crypto *) crp->crp_opaque; 491 IPSEC_ASSERT(tc != NULL, ("null opaque data area!")); 492 m = (struct mbuf *) crp->crp_buf; 493 skip = tc->tc_skip; 494 495 isr = tc->tc_isr; 496 IPSECREQUEST_LOCK(isr); 497 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi); 498 if (sav == NULL) { 499 ipcompstat.ipcomps_notdb++; 500 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 501 error = ENOBUFS; /*XXX*/ 502 goto bad; 503 } 504 IPSEC_ASSERT(isr->sav == sav, ("SA changed\n")); 505 506 /* Check for crypto errors */ 507 if (crp->crp_etype) { 508 /* Reset the session ID */ 509 if (sav->tdb_cryptoid != 0) 510 sav->tdb_cryptoid = crp->crp_sid; 511 512 if (crp->crp_etype == EAGAIN) { 513 KEY_FREESAV(&sav); 514 IPSECREQUEST_UNLOCK(isr); 515 return crypto_dispatch(crp); 516 } 517 ipcompstat.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.ipcomps_crypto++; 525 DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 526 error = EINVAL; 527 goto bad; 528 } 529 ipcompstat.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.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.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.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 ipcompstat.version = IPCOMPSTAT_VERSION; 634 xform_register(&ipcomp_xformsw); 635 } 636 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL);
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