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