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/route.h> 52#include <net/vnet.h> 53 54#include <netipsec/ipsec.h> 55#include <netipsec/xform.h> 56 57#ifdef INET6 58#include <netinet/ip6.h> 59#include <netipsec/ipsec6.h> 60#endif 61 62#include <netipsec/ipcomp.h> 63#include <netipsec/ipcomp_var.h> 64 65#include <netipsec/key.h> 66#include <netipsec/key_debug.h> 67 68#include <opencrypto/cryptodev.h> 69#include <opencrypto/deflate.h> 70#include <opencrypto/xform.h> 71 72VNET_DEFINE(int, ipcomp_enable) = 1; 73VNET_DEFINE(struct ipcompstat, ipcompstat); 74 75SYSCTL_DECL(_net_inet_ipcomp); 76SYSCTL_VNET_INT(_net_inet_ipcomp, OID_AUTO, 77 ipcomp_enable, CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, ""); 78SYSCTL_VNET_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS, 79 stats, CTLFLAG_RD, &VNET_NAME(ipcompstat), ipcompstat, ""); 80 81static int ipcomp_input_cb(struct cryptop *crp); 82static int ipcomp_output_cb(struct cryptop *crp); 83 84struct comp_algo * 85ipcomp_algorithm_lookup(int alg) 86{ 87 if (alg >= IPCOMP_ALG_MAX) 88 return NULL; 89 switch (alg) { 90 case SADB_X_CALG_DEFLATE: 91 return &comp_algo_deflate; 92 } 93 return NULL; 94} 95 96/* 97 * ipcomp_init() is called when an CPI is being set up. 98 */ 99static int 100ipcomp_init(struct secasvar *sav, struct xformsw *xsp) 101{ 102 struct comp_algo *tcomp; 103 struct cryptoini cric; 104 105 /* NB: algorithm really comes in alg_enc and not alg_comp! */ 106 tcomp = ipcomp_algorithm_lookup(sav->alg_enc); 107 if (tcomp == NULL) { 108 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__, 109 sav->alg_comp)); 110 return EINVAL; 111 } 112 sav->alg_comp = sav->alg_enc; /* set for doing histogram */ 113 sav->tdb_xform = xsp; 114 sav->tdb_compalgxform = tcomp; 115 116 /* Initialize crypto session */ 117 bzero(&cric, sizeof (cric)); 118 cric.cri_alg = sav->tdb_compalgxform->type; 119 120 return crypto_newsession(&sav->tdb_cryptoid, &cric, V_crypto_support); 121} 122 123/* 124 * ipcomp_zeroize() used when IPCA is deleted 125 */ 126static int 127ipcomp_zeroize(struct secasvar *sav) 128{ 129 int err; 130 131 err = crypto_freesession(sav->tdb_cryptoid); 132 sav->tdb_cryptoid = 0; 133 return err; 134} 135 136/* 137 * ipcomp_input() gets called to uncompress an input packet 138 */ 139static int 140ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 141{ 142 struct tdb_crypto *tc; 143 struct cryptodesc *crdc; 144 struct cryptop *crp; 145 struct ipcomp *ipcomp; 146 caddr_t addr; 147 int hlen = IPCOMP_HLENGTH; 148 149 /* 150 * Check that the next header of the IPComp is not IPComp again, before 151 * doing any real work. Given it is not possible to do double 152 * compression it means someone is playing tricks on us. 153 */ 154 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 155 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 156 DPRINTF(("%s: m_pullup failed\n", __func__)); 157 return (ENOBUFS); 158 } 159 addr = (caddr_t) mtod(m, struct ip *) + skip; 160 ipcomp = (struct ipcomp *)addr; 161 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) { 162 m_freem(m); 163 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */ 164 DPRINTF(("%s: recursive compression detected\n", __func__)); 165 return (EINVAL); 166 } 167 168 /* Get crypto descriptors */ 169 crp = crypto_getreq(1); 170 if (crp == NULL) { 171 m_freem(m); 172 DPRINTF(("%s: no crypto descriptors\n", __func__)); 173 IPCOMPSTAT_INC(ipcomps_crypto); 174 return ENOBUFS; 175 } 176 /* Get IPsec-specific opaque pointer */ 177 tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO); 178 if (tc == NULL) { 179 m_freem(m); 180 crypto_freereq(crp); 181 DPRINTF(("%s: cannot allocate tdb_crypto\n", __func__)); 182 IPCOMPSTAT_INC(ipcomps_crypto); 183 return ENOBUFS; 184 } 185 crdc = crp->crp_desc; 186 187 crdc->crd_skip = skip + hlen; 188 crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 189 crdc->crd_inject = skip; 190 191 tc->tc_ptr = 0; 192 193 /* Decompression operation */ 194 crdc->crd_alg = sav->tdb_compalgxform->type; 195 196 /* Crypto operation descriptor */ 197 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 198 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 199 crp->crp_buf = (caddr_t) m; 200 crp->crp_callback = ipcomp_input_cb; 201 crp->crp_sid = sav->tdb_cryptoid; 202 crp->crp_opaque = (caddr_t) tc; 203 204 /* These are passed as-is to the callback */ 205 tc->tc_spi = sav->spi; 206 tc->tc_dst = sav->sah->saidx.dst; 207 tc->tc_proto = sav->sah->saidx.proto; 208 tc->tc_protoff = protoff; 209 tc->tc_skip = skip; 210 KEY_ADDREFSA(sav); 211 tc->tc_sav = sav; 212 213 return crypto_dispatch(crp); 214} 215 216/* 217 * IPComp input callback from the crypto driver. 218 */ 219static int 220ipcomp_input_cb(struct cryptop *crp) 221{ 222 struct cryptodesc *crd; 223 struct tdb_crypto *tc; 224 int skip, protoff; 225 struct mtag *mtag; 226 struct mbuf *m; 227 struct secasvar *sav; 228 struct secasindex *saidx; 229 int hlen = IPCOMP_HLENGTH, error, clen; 230 u_int8_t nproto; 231 caddr_t addr; 232 233 crd = crp->crp_desc; 234 235 tc = (struct tdb_crypto *) crp->crp_opaque; 236 IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!")); 237 skip = tc->tc_skip; 238 protoff = tc->tc_protoff; 239 mtag = (struct mtag *) tc->tc_ptr; 240 m = (struct mbuf *) crp->crp_buf; 241 242 sav = tc->tc_sav; 243 IPSEC_ASSERT(sav != NULL, ("null SA!")); 244 245 saidx = &sav->sah->saidx; 246 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 247 saidx->dst.sa.sa_family == AF_INET6, 248 ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 249 250 /* Check for crypto errors */ 251 if (crp->crp_etype) { 252 /* Reset the session ID */ 253 if (sav->tdb_cryptoid != 0) 254 sav->tdb_cryptoid = crp->crp_sid; 255 256 if (crp->crp_etype == EAGAIN) { 257 return crypto_dispatch(crp); 258 } 259 IPCOMPSTAT_INC(ipcomps_noxform); 260 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 261 error = crp->crp_etype; 262 goto bad; 263 } 264 /* Shouldn't happen... */ 265 if (m == NULL) { 266 IPCOMPSTAT_INC(ipcomps_crypto); 267 DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 268 error = EINVAL; 269 goto bad; 270 } 271 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 272 273 clen = crp->crp_olen; /* Length of data after processing */ 274 275 /* Release the crypto descriptors */ 276 free(tc, M_XDATA), tc = NULL; 277 crypto_freereq(crp), crp = NULL; 278 279 /* In case it's not done already, adjust the size of the mbuf chain */ 280 m->m_pkthdr.len = clen + hlen + skip; 281 282 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { 283 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 284 DPRINTF(("%s: m_pullup failed\n", __func__)); 285 error = EINVAL; /*XXX*/ 286 goto bad; 287 } 288 289 /* Keep the next protocol field */ 290 addr = (caddr_t) mtod(m, struct ip *) + skip; 291 nproto = ((struct ipcomp *) addr)->comp_nxt; 292 293 /* Remove the IPCOMP header */ 294 error = m_striphdr(m, skip, hlen); 295 if (error) { 296 IPCOMPSTAT_INC(ipcomps_hdrops); 297 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 298 ipsec_address(&sav->sah->saidx.dst), 299 (u_long) ntohl(sav->spi))); 300 goto bad; 301 } 302 303 /* Restore the Next Protocol field */ 304 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 305 306 switch (saidx->dst.sa.sa_family) { 307#ifdef INET6 308 case AF_INET6: 309 error = ipsec6_common_input_cb(m, sav, skip, protoff, NULL); 310 break; 311#endif 312#ifdef INET 313 case AF_INET: 314 error = ipsec4_common_input_cb(m, sav, skip, protoff, NULL); 315 break; 316#endif 317 default: 318 panic("%s: Unexpected address family: %d saidx=%p", __func__, 319 saidx->dst.sa.sa_family, saidx); 320 } 321 322 KEY_FREESAV(&sav); 323 return error; 324bad: 325 if (sav) 326 KEY_FREESAV(&sav); 327 if (m) 328 m_freem(m); 329 if (tc != NULL) 330 free(tc, M_XDATA); 331 if (crp) 332 crypto_freereq(crp); 333 return error; 334} 335 336/* 337 * IPComp output routine, called by ipsec[46]_process_packet() 338 */ 339static int 340ipcomp_output( 341 struct mbuf *m, 342 struct ipsecrequest *isr, 343 struct mbuf **mp, 344 int skip, 345 int protoff 346) 347{ 348 struct secasvar *sav; 349 struct comp_algo *ipcompx; 350 int error, ralen, maxpacketsize; 351 struct cryptodesc *crdc; 352 struct cryptop *crp; 353 struct tdb_crypto *tc; 354 355 sav = isr->sav; 356 IPSEC_ASSERT(sav != NULL, ("null SA")); 357 ipcompx = sav->tdb_compalgxform; 358 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 359 360 /* 361 * Do not touch the packet in case our payload to compress 362 * is lower than the minimal threshold of the compression 363 * alogrithm. We will just send out the data uncompressed. 364 * See RFC 3173, 2.2. Non-Expansion Policy. 365 */ 366 if (m->m_pkthdr.len <= ipcompx->minlen) { 367 IPCOMPSTAT_INC(ipcomps_threshold); 368 return ipsec_process_done(m, isr); 369 } 370 371 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 372 IPCOMPSTAT_INC(ipcomps_output); 373 374 /* Check for maximum packet size violations. */ 375 switch (sav->sah->saidx.dst.sa.sa_family) { 376#ifdef INET 377 case AF_INET: 378 maxpacketsize = IP_MAXPACKET; 379 break; 380#endif /* INET */ 381#ifdef INET6 382 case AF_INET6: 383 maxpacketsize = IPV6_MAXPACKET; 384 break; 385#endif /* INET6 */ 386 default: 387 IPCOMPSTAT_INC(ipcomps_nopf); 388 DPRINTF(("%s: unknown/unsupported protocol family %d, " 389 "IPCA %s/%08lx\n", __func__, 390 sav->sah->saidx.dst.sa.sa_family, 391 ipsec_address(&sav->sah->saidx.dst), 392 (u_long) ntohl(sav->spi))); 393 error = EPFNOSUPPORT; 394 goto bad; 395 } 396 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 397 IPCOMPSTAT_INC(ipcomps_toobig); 398 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 399 "(len %u, max len %u)\n", __func__, 400 ipsec_address(&sav->sah->saidx.dst), 401 (u_long) ntohl(sav->spi), 402 ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 403 error = EMSGSIZE; 404 goto bad; 405 } 406 407 /* Update the counters */ 408 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip); 409 410 m = m_unshare(m, M_NOWAIT); 411 if (m == NULL) { 412 IPCOMPSTAT_INC(ipcomps_hdrops); 413 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 414 __func__, ipsec_address(&sav->sah->saidx.dst), 415 (u_long) ntohl(sav->spi))); 416 error = ENOBUFS; 417 goto bad; 418 } 419 420 /* Ok now, we can pass to the crypto processing. */ 421 422 /* Get crypto descriptors */ 423 crp = crypto_getreq(1); 424 if (crp == NULL) { 425 IPCOMPSTAT_INC(ipcomps_crypto); 426 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 427 error = ENOBUFS; 428 goto bad; 429 } 430 crdc = crp->crp_desc; 431 432 /* Compression descriptor */ 433 crdc->crd_skip = skip; 434 crdc->crd_len = ralen; 435 crdc->crd_flags = CRD_F_COMP; 436 crdc->crd_inject = skip; 437 438 /* Compression operation */ 439 crdc->crd_alg = ipcompx->type; 440 441 /* IPsec-specific opaque crypto info */ 442 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto), 443 M_XDATA, M_NOWAIT|M_ZERO); 444 if (tc == NULL) { 445 IPCOMPSTAT_INC(ipcomps_crypto); 446 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__)); 447 crypto_freereq(crp); 448 error = ENOBUFS; 449 goto bad; 450 } 451 452 tc->tc_isr = isr; 453 KEY_ADDREFSA(sav); 454 tc->tc_sav = sav; 455 tc->tc_spi = sav->spi; 456 tc->tc_dst = sav->sah->saidx.dst; 457 tc->tc_proto = sav->sah->saidx.proto; 458 tc->tc_protoff = protoff; 459 tc->tc_skip = skip; 460 461 /* Crypto operation descriptor */ 462 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 463 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 464 crp->crp_buf = (caddr_t) m; 465 crp->crp_callback = ipcomp_output_cb; 466 crp->crp_opaque = (caddr_t) tc; 467 crp->crp_sid = sav->tdb_cryptoid; 468 469 return crypto_dispatch(crp); 470bad: 471 if (m) 472 m_freem(m); 473 return (error); 474} 475 476/* 477 * IPComp output callback from the crypto driver. 478 */ 479static int 480ipcomp_output_cb(struct cryptop *crp) 481{ 482 struct tdb_crypto *tc; 483 struct ipsecrequest *isr; 484 struct secasvar *sav; 485 struct mbuf *m; 486 int error, skip; 487 488 tc = (struct tdb_crypto *) crp->crp_opaque; 489 IPSEC_ASSERT(tc != NULL, ("null opaque data area!")); 490 m = (struct mbuf *) crp->crp_buf; 491 skip = tc->tc_skip; 492 493 isr = tc->tc_isr; 494 IPSECREQUEST_LOCK(isr); 495 sav = tc->tc_sav; 496 /* With the isr lock released SA pointer can be updated. */ 497 if (sav != isr->sav) { 498 IPCOMPSTAT_INC(ipcomps_notdb); 499 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 500 error = ENOBUFS; /*XXX*/ 501 goto bad; 502 } 503 504 /* Check for crypto errors */ 505 if (crp->crp_etype) { 506 /* Reset the session ID */ 507 if (sav->tdb_cryptoid != 0) 508 sav->tdb_cryptoid = crp->crp_sid; 509 510 if (crp->crp_etype == EAGAIN) { 511 IPSECREQUEST_UNLOCK(isr); 512 return crypto_dispatch(crp); 513 } 514 IPCOMPSTAT_INC(ipcomps_noxform); 515 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 516 error = crp->crp_etype; 517 goto bad; 518 } 519 /* Shouldn't happen... */ 520 if (m == NULL) { 521 IPCOMPSTAT_INC(ipcomps_crypto); 522 DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 523 error = EINVAL; 524 goto bad; 525 } 526 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 527 528 if (crp->crp_ilen - skip > crp->crp_olen) { 529 struct mbuf *mo; 530 struct ipcomp *ipcomp; 531 int roff; 532 uint8_t prot; 533 534 /* Compression helped, inject IPCOMP header. */ 535 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 536 if (mo == NULL) { 537 IPCOMPSTAT_INC(ipcomps_wrap); 538 DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n", 539 __func__, ipsec_address(&sav->sah->saidx.dst), 540 (u_long) ntohl(sav->spi))); 541 error = ENOBUFS; 542 goto bad; 543 } 544 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 545 546 /* Initialize the IPCOMP header */ 547 /* XXX alignment always correct? */ 548 switch (sav->sah->saidx.dst.sa.sa_family) { 549#ifdef INET 550 case AF_INET: 551 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 552 break; 553#endif /* INET */ 554#ifdef INET6 555 case AF_INET6: 556 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 557 break; 558#endif 559 } 560 ipcomp->comp_flags = 0; 561 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 562 563 /* Fix Next Protocol in IPv4/IPv6 header */ 564 prot = IPPROTO_IPCOMP; 565 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t), 566 (u_char *)&prot); 567 568 /* Adjust the length in the IP header */ 569 switch (sav->sah->saidx.dst.sa.sa_family) { 570#ifdef INET 571 case AF_INET: 572 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 573 break; 574#endif /* INET */ 575#ifdef INET6 576 case AF_INET6: 577 mtod(m, struct ip6_hdr *)->ip6_plen = 578 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 579 break; 580#endif /* INET6 */ 581 default: 582 IPCOMPSTAT_INC(ipcomps_nopf); 583 DPRINTF(("%s: unknown/unsupported protocol " 584 "family %d, IPCA %s/%08lx\n", __func__, 585 sav->sah->saidx.dst.sa.sa_family, 586 ipsec_address(&sav->sah->saidx.dst), 587 (u_long) ntohl(sav->spi))); 588 error = EPFNOSUPPORT; 589 goto bad; 590 } 591 } else { 592 /* Compression was useless, we have lost time. */ 593 IPCOMPSTAT_INC(ipcomps_uncompr); 594 DPRINTF(("%s: compressions was useless %d - %d <= %d\n", 595 __func__, crp->crp_ilen, skip, crp->crp_olen)); 596 /* XXX remember state to not compress the next couple 597 * of packets, RFC 3173, 2.2. Non-Expansion Policy */ 598 } 599 600 /* Release the crypto descriptor */ 601 free(tc, M_XDATA); 602 crypto_freereq(crp); 603 604 /* NB: m is reclaimed by ipsec_process_done. */ 605 error = ipsec_process_done(m, isr); 606 KEY_FREESAV(&sav); 607 IPSECREQUEST_UNLOCK(isr); 608 return error; 609bad: 610 if (sav) 611 KEY_FREESAV(&sav); 612 IPSECREQUEST_UNLOCK(isr); 613 if (m) 614 m_freem(m); 615 free(tc, M_XDATA); 616 crypto_freereq(crp); 617 return error; 618} 619 620static struct xformsw ipcomp_xformsw = { 621 XF_IPCOMP, XFT_COMP, "IPcomp", 622 ipcomp_init, ipcomp_zeroize, ipcomp_input, 623 ipcomp_output 624}; 625 626static void 627ipcomp_attach(void) 628{ 629 630 xform_register(&ipcomp_xformsw); 631} 632 633SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL); 634 635static void 636vnet_ipcomp_attach(const void *unused __unused) 637{ 638 639 /* XXX */ 640 V_ipcompstat.version = IPCOMPSTAT_VERSION; 641} 642 643VNET_SYSINIT(vnet_ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 644 vnet_ipcomp_attach, NULL); 645