1 /* $FreeBSD$ */ 2 /* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */ 3 4 /*- 5 * SPDX-License-Identifier: BSD-3-Clause 6 * 7 * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org) 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* IP payload compression protocol (IPComp), see RFC 2393 */ 34 #include "opt_inet.h" 35 #include "opt_inet6.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/mbuf.h> 40 #include <sys/lock.h> 41 #include <sys/mutex.h> 42 #include <sys/socket.h> 43 #include <sys/kernel.h> 44 #include <sys/protosw.h> 45 #include <sys/sysctl.h> 46 47 #include <netinet/in.h> 48 #include <netinet/in_systm.h> 49 #include <netinet/ip.h> 50 #include <netinet/ip_var.h> 51 #include <netinet/ip_encap.h> 52 53 #include <net/netisr.h> 54 #include <net/vnet.h> 55 #include <net/if.h> /* XXXGL: net_epoch should move out there */ 56 #include <net/if_var.h> /* XXXGL: net_epoch should move out there */ 57 58 #include <netipsec/ipsec.h> 59 #include <netipsec/xform.h> 60 61 #ifdef INET6 62 #include <netinet/ip6.h> 63 #include <netinet6/ip6_var.h> 64 #include <netipsec/ipsec6.h> 65 #endif 66 67 #include <netipsec/ipcomp.h> 68 #include <netipsec/ipcomp_var.h> 69 70 #include <netipsec/key.h> 71 #include <netipsec/key_debug.h> 72 73 #include <opencrypto/cryptodev.h> 74 #include <opencrypto/deflate.h> 75 #include <opencrypto/xform.h> 76 77 VNET_DEFINE(int, ipcomp_enable) = 1; 78 VNET_PCPUSTAT_DEFINE(struct ipcompstat, ipcompstat); 79 VNET_PCPUSTAT_SYSINIT(ipcompstat); 80 81 #ifdef VIMAGE 82 VNET_PCPUSTAT_SYSUNINIT(ipcompstat); 83 #endif /* VIMAGE */ 84 85 SYSCTL_DECL(_net_inet_ipcomp); 86 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, ipcomp_enable, 87 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, ""); 88 SYSCTL_VNET_PCPUSTAT(_net_inet_ipcomp, IPSECCTL_STATS, stats, 89 struct ipcompstat, ipcompstat, 90 "IPCOMP statistics (struct ipcompstat, netipsec/ipcomp_var.h"); 91 92 static int ipcomp_input_cb(struct cryptop *crp); 93 static int ipcomp_output_cb(struct cryptop *crp); 94 95 /* 96 * RFC 3173 p 2.2. Non-Expansion Policy: 97 * If the total size of a compressed payload and the IPComp header, as 98 * defined in section 3, is not smaller than the size of the original 99 * payload, the IP datagram MUST be sent in the original non-compressed 100 * form. 101 * 102 * When we use IPComp in tunnel mode, for small packets we will receive 103 * encapsulated IP-IP datagrams without any compression and without IPComp 104 * header. 105 */ 106 static int 107 ipcomp_encapcheck(union sockaddr_union *src, union sockaddr_union *dst) 108 { 109 struct secasvar *sav; 110 111 sav = key_allocsa_tunnel(src, dst, IPPROTO_IPCOMP); 112 if (sav == NULL) 113 return (0); 114 key_freesav(&sav); 115 116 if (src->sa.sa_family == AF_INET) 117 return (sizeof(struct in_addr) << 4); 118 else 119 return (sizeof(struct in6_addr) << 4); 120 } 121 122 static int 123 ipcomp_nonexp_input(struct mbuf *m, int off, int proto, void *arg __unused) 124 { 125 int isr; 126 127 NET_EPOCH_ASSERT(); 128 129 switch (proto) { 130 #ifdef INET 131 case IPPROTO_IPV4: 132 isr = NETISR_IP; 133 break; 134 #endif 135 #ifdef INET6 136 case IPPROTO_IPV6: 137 isr = NETISR_IPV6; 138 break; 139 #endif 140 default: 141 IPCOMPSTAT_INC(ipcomps_nopf); 142 m_freem(m); 143 return (IPPROTO_DONE); 144 } 145 m_adj(m, off); 146 IPCOMPSTAT_ADD(ipcomps_ibytes, m->m_pkthdr.len); 147 IPCOMPSTAT_INC(ipcomps_input); 148 netisr_dispatch(isr, m); 149 return (IPPROTO_DONE); 150 } 151 152 /* 153 * ipcomp_init() is called when an CPI is being set up. 154 */ 155 static int 156 ipcomp_init(struct secasvar *sav, struct xformsw *xsp) 157 { 158 const struct comp_algo *tcomp; 159 struct cryptoini cric; 160 161 /* NB: algorithm really comes in alg_enc and not alg_comp! */ 162 tcomp = comp_algorithm_lookup(sav->alg_enc); 163 if (tcomp == NULL) { 164 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__, 165 sav->alg_comp)); 166 return EINVAL; 167 } 168 sav->alg_comp = sav->alg_enc; /* set for doing histogram */ 169 sav->tdb_xform = xsp; 170 sav->tdb_compalgxform = tcomp; 171 172 /* Initialize crypto session */ 173 bzero(&cric, sizeof (cric)); 174 cric.cri_alg = sav->tdb_compalgxform->type; 175 176 return crypto_newsession(&sav->tdb_cryptoid, &cric, V_crypto_support); 177 } 178 179 /* 180 * ipcomp_zeroize() used when IPCA is deleted 181 */ 182 static int 183 ipcomp_zeroize(struct secasvar *sav) 184 { 185 186 crypto_freesession(sav->tdb_cryptoid); 187 sav->tdb_cryptoid = NULL; 188 return 0; 189 } 190 191 /* 192 * ipcomp_input() gets called to uncompress an input packet 193 */ 194 static int 195 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 196 { 197 struct xform_data *xd; 198 struct cryptodesc *crdc; 199 struct cryptop *crp; 200 struct ipcomp *ipcomp; 201 caddr_t addr; 202 int error, hlen = IPCOMP_HLENGTH; 203 204 /* 205 * Check that the next header of the IPComp is not IPComp again, before 206 * doing any real work. Given it is not possible to do double 207 * compression it means someone is playing tricks on us. 208 */ 209 error = ENOBUFS; 210 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 211 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 212 DPRINTF(("%s: m_pullup failed\n", __func__)); 213 key_freesav(&sav); 214 return (error); 215 } 216 addr = (caddr_t) mtod(m, struct ip *) + skip; 217 ipcomp = (struct ipcomp *)addr; 218 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) { 219 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */ 220 DPRINTF(("%s: recursive compression detected\n", __func__)); 221 error = EINVAL; 222 goto bad; 223 } 224 225 /* Get crypto descriptors */ 226 crp = crypto_getreq(1); 227 if (crp == NULL) { 228 DPRINTF(("%s: no crypto descriptors\n", __func__)); 229 IPCOMPSTAT_INC(ipcomps_crypto); 230 goto bad; 231 } 232 /* Get IPsec-specific opaque pointer */ 233 xd = malloc(sizeof(*xd), M_XDATA, M_NOWAIT | M_ZERO); 234 if (xd == NULL) { 235 DPRINTF(("%s: cannot allocate xform_data\n", __func__)); 236 IPCOMPSTAT_INC(ipcomps_crypto); 237 crypto_freereq(crp); 238 goto bad; 239 } 240 crdc = crp->crp_desc; 241 242 crdc->crd_skip = skip + hlen; 243 crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 244 crdc->crd_inject = skip; 245 246 /* Decompression operation */ 247 crdc->crd_alg = sav->tdb_compalgxform->type; 248 249 250 /* Crypto operation descriptor */ 251 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 252 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 253 crp->crp_buf = (caddr_t) m; 254 crp->crp_callback = ipcomp_input_cb; 255 crp->crp_opaque = (caddr_t) xd; 256 257 /* These are passed as-is to the callback */ 258 xd->sav = sav; 259 xd->protoff = protoff; 260 xd->skip = skip; 261 xd->vnet = curvnet; 262 263 SECASVAR_LOCK(sav); 264 crp->crp_session = xd->cryptoid = sav->tdb_cryptoid; 265 SECASVAR_UNLOCK(sav); 266 267 return crypto_dispatch(crp); 268 bad: 269 m_freem(m); 270 key_freesav(&sav); 271 return (error); 272 } 273 274 /* 275 * IPComp input callback from the crypto driver. 276 */ 277 static int 278 ipcomp_input_cb(struct cryptop *crp) 279 { 280 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 281 struct xform_data *xd; 282 struct mbuf *m; 283 struct secasvar *sav; 284 struct secasindex *saidx; 285 caddr_t addr; 286 crypto_session_t cryptoid; 287 int hlen = IPCOMP_HLENGTH, error, clen; 288 int skip, protoff; 289 uint8_t nproto; 290 291 m = (struct mbuf *) crp->crp_buf; 292 xd = (struct xform_data *) crp->crp_opaque; 293 CURVNET_SET(xd->vnet); 294 sav = xd->sav; 295 skip = xd->skip; 296 protoff = xd->protoff; 297 cryptoid = xd->cryptoid; 298 saidx = &sav->sah->saidx; 299 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 300 saidx->dst.sa.sa_family == AF_INET6, 301 ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 302 303 /* Check for crypto errors */ 304 if (crp->crp_etype) { 305 if (crp->crp_etype == EAGAIN) { 306 /* Reset the session ID */ 307 if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0) 308 crypto_freesession(cryptoid); 309 xd->cryptoid = crp->crp_session; 310 CURVNET_RESTORE(); 311 return (crypto_dispatch(crp)); 312 } 313 IPCOMPSTAT_INC(ipcomps_noxform); 314 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 315 error = crp->crp_etype; 316 goto bad; 317 } 318 /* Shouldn't happen... */ 319 if (m == NULL) { 320 IPCOMPSTAT_INC(ipcomps_crypto); 321 DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 322 error = EINVAL; 323 goto bad; 324 } 325 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 326 327 clen = crp->crp_olen; /* Length of data after processing */ 328 329 /* Release the crypto descriptors */ 330 free(xd, M_XDATA), xd = NULL; 331 crypto_freereq(crp), crp = NULL; 332 333 /* In case it's not done already, adjust the size of the mbuf chain */ 334 m->m_pkthdr.len = clen + hlen + skip; 335 336 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 337 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 338 DPRINTF(("%s: m_pullup failed\n", __func__)); 339 error = EINVAL; /*XXX*/ 340 goto bad; 341 } 342 343 /* Keep the next protocol field */ 344 addr = (caddr_t) mtod(m, struct ip *) + skip; 345 nproto = ((struct ipcomp *) addr)->comp_nxt; 346 347 /* Remove the IPCOMP header */ 348 error = m_striphdr(m, skip, hlen); 349 if (error) { 350 IPCOMPSTAT_INC(ipcomps_hdrops); 351 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 352 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 353 (u_long) ntohl(sav->spi))); 354 goto bad; 355 } 356 357 /* Restore the Next Protocol field */ 358 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 359 360 switch (saidx->dst.sa.sa_family) { 361 #ifdef INET6 362 case AF_INET6: 363 error = ipsec6_common_input_cb(m, sav, skip, protoff); 364 break; 365 #endif 366 #ifdef INET 367 case AF_INET: 368 error = ipsec4_common_input_cb(m, sav, skip, protoff); 369 break; 370 #endif 371 default: 372 panic("%s: Unexpected address family: %d saidx=%p", __func__, 373 saidx->dst.sa.sa_family, saidx); 374 } 375 CURVNET_RESTORE(); 376 return error; 377 bad: 378 CURVNET_RESTORE(); 379 if (sav != NULL) 380 key_freesav(&sav); 381 if (m != NULL) 382 m_freem(m); 383 if (xd != NULL) 384 free(xd, M_XDATA); 385 if (crp != NULL) 386 crypto_freereq(crp); 387 return error; 388 } 389 390 /* 391 * IPComp output routine, called by ipsec[46]_perform_request() 392 */ 393 static int 394 ipcomp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav, 395 u_int idx, int skip, int protoff) 396 { 397 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 398 const struct comp_algo *ipcompx; 399 struct cryptodesc *crdc; 400 struct cryptop *crp; 401 struct xform_data *xd; 402 int error, ralen, maxpacketsize; 403 404 IPSEC_ASSERT(sav != NULL, ("null SA")); 405 ipcompx = sav->tdb_compalgxform; 406 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 407 408 /* 409 * Do not touch the packet in case our payload to compress 410 * is lower than the minimal threshold of the compression 411 * alogrithm. We will just send out the data uncompressed. 412 * See RFC 3173, 2.2. Non-Expansion Policy. 413 */ 414 if (m->m_pkthdr.len <= ipcompx->minlen) { 415 IPCOMPSTAT_INC(ipcomps_threshold); 416 return ipsec_process_done(m, sp, sav, idx); 417 } 418 419 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 420 IPCOMPSTAT_INC(ipcomps_output); 421 422 /* Check for maximum packet size violations. */ 423 switch (sav->sah->saidx.dst.sa.sa_family) { 424 #ifdef INET 425 case AF_INET: 426 maxpacketsize = IP_MAXPACKET; 427 break; 428 #endif /* INET */ 429 #ifdef INET6 430 case AF_INET6: 431 maxpacketsize = IPV6_MAXPACKET; 432 break; 433 #endif /* INET6 */ 434 default: 435 IPCOMPSTAT_INC(ipcomps_nopf); 436 DPRINTF(("%s: unknown/unsupported protocol family %d, " 437 "IPCA %s/%08lx\n", __func__, 438 sav->sah->saidx.dst.sa.sa_family, 439 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 440 (u_long) ntohl(sav->spi))); 441 error = EPFNOSUPPORT; 442 goto bad; 443 } 444 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 445 IPCOMPSTAT_INC(ipcomps_toobig); 446 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 447 "(len %u, max len %u)\n", __func__, 448 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 449 (u_long) ntohl(sav->spi), 450 ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 451 error = EMSGSIZE; 452 goto bad; 453 } 454 455 /* Update the counters */ 456 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip); 457 458 m = m_unshare(m, M_NOWAIT); 459 if (m == NULL) { 460 IPCOMPSTAT_INC(ipcomps_hdrops); 461 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 462 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 463 sizeof(buf)), (u_long) ntohl(sav->spi))); 464 error = ENOBUFS; 465 goto bad; 466 } 467 468 /* Ok now, we can pass to the crypto processing. */ 469 470 /* Get crypto descriptors */ 471 crp = crypto_getreq(1); 472 if (crp == NULL) { 473 IPCOMPSTAT_INC(ipcomps_crypto); 474 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 475 error = ENOBUFS; 476 goto bad; 477 } 478 crdc = crp->crp_desc; 479 480 /* Compression descriptor */ 481 crdc->crd_skip = skip; 482 crdc->crd_len = ralen; 483 crdc->crd_flags = CRD_F_COMP; 484 crdc->crd_inject = skip; 485 486 /* Compression operation */ 487 crdc->crd_alg = ipcompx->type; 488 489 /* IPsec-specific opaque crypto info */ 490 xd = malloc(sizeof(struct xform_data), M_XDATA, M_NOWAIT | M_ZERO); 491 if (xd == NULL) { 492 IPCOMPSTAT_INC(ipcomps_crypto); 493 DPRINTF(("%s: failed to allocate xform_data\n", __func__)); 494 crypto_freereq(crp); 495 error = ENOBUFS; 496 goto bad; 497 } 498 499 xd->sp = sp; 500 xd->sav = sav; 501 xd->idx = idx; 502 xd->skip = skip; 503 xd->protoff = protoff; 504 xd->vnet = curvnet; 505 506 /* Crypto operation descriptor */ 507 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 508 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 509 crp->crp_buf = (caddr_t) m; 510 crp->crp_callback = ipcomp_output_cb; 511 crp->crp_opaque = (caddr_t) xd; 512 513 SECASVAR_LOCK(sav); 514 crp->crp_session = xd->cryptoid = sav->tdb_cryptoid; 515 SECASVAR_UNLOCK(sav); 516 517 return crypto_dispatch(crp); 518 bad: 519 if (m) 520 m_freem(m); 521 key_freesav(&sav); 522 key_freesp(&sp); 523 return (error); 524 } 525 526 /* 527 * IPComp output callback from the crypto driver. 528 */ 529 static int 530 ipcomp_output_cb(struct cryptop *crp) 531 { 532 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 533 struct xform_data *xd; 534 struct secpolicy *sp; 535 struct secasvar *sav; 536 struct mbuf *m; 537 crypto_session_t cryptoid; 538 u_int idx; 539 int error, skip, protoff; 540 541 m = (struct mbuf *) crp->crp_buf; 542 xd = (struct xform_data *) crp->crp_opaque; 543 CURVNET_SET(xd->vnet); 544 idx = xd->idx; 545 sp = xd->sp; 546 sav = xd->sav; 547 skip = xd->skip; 548 protoff = xd->protoff; 549 cryptoid = xd->cryptoid; 550 551 /* Check for crypto errors */ 552 if (crp->crp_etype) { 553 if (crp->crp_etype == EAGAIN) { 554 /* Reset the session ID */ 555 if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0) 556 crypto_freesession(cryptoid); 557 xd->cryptoid = crp->crp_session; 558 CURVNET_RESTORE(); 559 return (crypto_dispatch(crp)); 560 } 561 IPCOMPSTAT_INC(ipcomps_noxform); 562 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 563 error = crp->crp_etype; 564 goto bad; 565 } 566 /* Shouldn't happen... */ 567 if (m == NULL) { 568 IPCOMPSTAT_INC(ipcomps_crypto); 569 DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 570 error = EINVAL; 571 goto bad; 572 } 573 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 574 575 if (crp->crp_ilen - skip > crp->crp_olen) { 576 struct mbuf *mo; 577 struct ipcomp *ipcomp; 578 int roff; 579 uint8_t prot; 580 581 /* Compression helped, inject IPCOMP header. */ 582 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 583 if (mo == NULL) { 584 IPCOMPSTAT_INC(ipcomps_wrap); 585 DPRINTF(("%s: IPCOMP header inject failed " 586 "for IPCA %s/%08lx\n", 587 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 588 sizeof(buf)), (u_long) ntohl(sav->spi))); 589 error = ENOBUFS; 590 goto bad; 591 } 592 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 593 594 /* Initialize the IPCOMP header */ 595 /* XXX alignment always correct? */ 596 switch (sav->sah->saidx.dst.sa.sa_family) { 597 #ifdef INET 598 case AF_INET: 599 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 600 break; 601 #endif /* INET */ 602 #ifdef INET6 603 case AF_INET6: 604 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 605 break; 606 #endif 607 } 608 ipcomp->comp_flags = 0; 609 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 610 611 /* Fix Next Protocol in IPv4/IPv6 header */ 612 prot = IPPROTO_IPCOMP; 613 m_copyback(m, protoff, sizeof(u_int8_t), 614 (u_char *)&prot); 615 616 /* Adjust the length in the IP header */ 617 switch (sav->sah->saidx.dst.sa.sa_family) { 618 #ifdef INET 619 case AF_INET: 620 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 621 break; 622 #endif /* INET */ 623 #ifdef INET6 624 case AF_INET6: 625 mtod(m, struct ip6_hdr *)->ip6_plen = 626 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 627 break; 628 #endif /* INET6 */ 629 default: 630 IPCOMPSTAT_INC(ipcomps_nopf); 631 DPRINTF(("%s: unknown/unsupported protocol " 632 "family %d, IPCA %s/%08lx\n", __func__, 633 sav->sah->saidx.dst.sa.sa_family, 634 ipsec_address(&sav->sah->saidx.dst, buf, 635 sizeof(buf)), (u_long) ntohl(sav->spi))); 636 error = EPFNOSUPPORT; 637 goto bad; 638 } 639 } else { 640 /* Compression was useless, we have lost time. */ 641 IPCOMPSTAT_INC(ipcomps_uncompr); 642 DPRINTF(("%s: compressions was useless %d - %d <= %d\n", 643 __func__, crp->crp_ilen, skip, crp->crp_olen)); 644 /* XXX remember state to not compress the next couple 645 * of packets, RFC 3173, 2.2. Non-Expansion Policy */ 646 } 647 648 /* Release the crypto descriptor */ 649 free(xd, M_XDATA); 650 crypto_freereq(crp); 651 652 /* NB: m is reclaimed by ipsec_process_done. */ 653 error = ipsec_process_done(m, sp, sav, idx); 654 CURVNET_RESTORE(); 655 return (error); 656 bad: 657 if (m) 658 m_freem(m); 659 CURVNET_RESTORE(); 660 free(xd, M_XDATA); 661 crypto_freereq(crp); 662 key_freesav(&sav); 663 key_freesp(&sp); 664 return (error); 665 } 666 667 #ifdef INET 668 static int 669 ipcomp4_nonexp_encapcheck(const struct mbuf *m, int off, int proto, 670 void *arg __unused) 671 { 672 union sockaddr_union src, dst; 673 const struct ip *ip; 674 675 if (V_ipcomp_enable == 0) 676 return (0); 677 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6) 678 return (0); 679 bzero(&src, sizeof(src)); 680 bzero(&dst, sizeof(dst)); 681 src.sa.sa_family = dst.sa.sa_family = AF_INET; 682 src.sin.sin_len = dst.sin.sin_len = sizeof(struct sockaddr_in); 683 ip = mtod(m, const struct ip *); 684 src.sin.sin_addr = ip->ip_src; 685 dst.sin.sin_addr = ip->ip_dst; 686 return (ipcomp_encapcheck(&src, &dst)); 687 } 688 689 static const struct encaptab *ipe4_cookie = NULL; 690 static const struct encap_config ipv4_encap_cfg = { 691 .proto = -1, 692 .min_length = sizeof(struct ip), 693 .exact_match = sizeof(in_addr_t) << 4, 694 .check = ipcomp4_nonexp_encapcheck, 695 .input = ipcomp_nonexp_input 696 }; 697 #endif 698 #ifdef INET6 699 static int 700 ipcomp6_nonexp_encapcheck(const struct mbuf *m, int off, int proto, 701 void *arg __unused) 702 { 703 union sockaddr_union src, dst; 704 const struct ip6_hdr *ip6; 705 706 if (V_ipcomp_enable == 0) 707 return (0); 708 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6) 709 return (0); 710 bzero(&src, sizeof(src)); 711 bzero(&dst, sizeof(dst)); 712 src.sa.sa_family = dst.sa.sa_family = AF_INET; 713 src.sin6.sin6_len = dst.sin6.sin6_len = sizeof(struct sockaddr_in6); 714 ip6 = mtod(m, const struct ip6_hdr *); 715 src.sin6.sin6_addr = ip6->ip6_src; 716 dst.sin6.sin6_addr = ip6->ip6_dst; 717 if (IN6_IS_SCOPE_LINKLOCAL(&src.sin6.sin6_addr)) { 718 /* XXX: sa6_recoverscope() */ 719 src.sin6.sin6_scope_id = 720 ntohs(src.sin6.sin6_addr.s6_addr16[1]); 721 src.sin6.sin6_addr.s6_addr16[1] = 0; 722 } 723 if (IN6_IS_SCOPE_LINKLOCAL(&dst.sin6.sin6_addr)) { 724 /* XXX: sa6_recoverscope() */ 725 dst.sin6.sin6_scope_id = 726 ntohs(dst.sin6.sin6_addr.s6_addr16[1]); 727 dst.sin6.sin6_addr.s6_addr16[1] = 0; 728 } 729 return (ipcomp_encapcheck(&src, &dst)); 730 } 731 732 static const struct encaptab *ipe6_cookie = NULL; 733 static const struct encap_config ipv6_encap_cfg = { 734 .proto = -1, 735 .min_length = sizeof(struct ip6_hdr), 736 .exact_match = sizeof(struct in6_addr) << 4, 737 .check = ipcomp6_nonexp_encapcheck, 738 .input = ipcomp_nonexp_input 739 }; 740 #endif 741 742 static struct xformsw ipcomp_xformsw = { 743 .xf_type = XF_IPCOMP, 744 .xf_name = "IPcomp", 745 .xf_init = ipcomp_init, 746 .xf_zeroize = ipcomp_zeroize, 747 .xf_input = ipcomp_input, 748 .xf_output = ipcomp_output, 749 }; 750 751 static void 752 ipcomp_attach(void) 753 { 754 755 #ifdef INET 756 ipe4_cookie = ip_encap_attach(&ipv4_encap_cfg, NULL, M_WAITOK); 757 #endif 758 #ifdef INET6 759 ipe6_cookie = ip6_encap_attach(&ipv6_encap_cfg, NULL, M_WAITOK); 760 #endif 761 xform_attach(&ipcomp_xformsw); 762 } 763 764 static void 765 ipcomp_detach(void) 766 { 767 768 #ifdef INET 769 ip_encap_detach(ipe4_cookie); 770 #endif 771 #ifdef INET6 772 ip6_encap_detach(ipe6_cookie); 773 #endif 774 xform_detach(&ipcomp_xformsw); 775 } 776 777 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 778 ipcomp_attach, NULL); 779 SYSUNINIT(ipcomp_xform_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 780 ipcomp_detach, NULL); 781