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 crypto_session_params csp; 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 memset(&csp, 0, sizeof(csp)); 174 csp.csp_mode = CSP_MODE_COMPRESS; 175 csp.csp_cipher_alg = sav->tdb_compalgxform->type; 176 177 return crypto_newsession(&sav->tdb_cryptoid, &csp, V_crypto_support); 178 } 179 180 /* 181 * ipcomp_zeroize() used when IPCA is deleted 182 */ 183 static int 184 ipcomp_zeroize(struct secasvar *sav) 185 { 186 187 crypto_freesession(sav->tdb_cryptoid); 188 sav->tdb_cryptoid = NULL; 189 return 0; 190 } 191 192 /* 193 * ipcomp_input() gets called to uncompress an input packet 194 */ 195 static int 196 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 197 { 198 struct xform_data *xd; 199 struct cryptop *crp; 200 struct ipcomp *ipcomp; 201 crypto_session_t cryptoid; 202 caddr_t addr; 203 int error, hlen = IPCOMP_HLENGTH; 204 205 /* 206 * Check that the next header of the IPComp is not IPComp again, before 207 * doing any real work. Given it is not possible to do double 208 * compression it means someone is playing tricks on us. 209 */ 210 error = ENOBUFS; 211 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 212 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 213 DPRINTF(("%s: m_pullup failed\n", __func__)); 214 key_freesav(&sav); 215 return (error); 216 } 217 addr = (caddr_t) mtod(m, struct ip *) + skip; 218 ipcomp = (struct ipcomp *)addr; 219 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) { 220 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */ 221 DPRINTF(("%s: recursive compression detected\n", __func__)); 222 error = EINVAL; 223 goto bad; 224 } 225 226 SECASVAR_LOCK(sav); 227 cryptoid = sav->tdb_cryptoid; 228 SECASVAR_UNLOCK(sav); 229 230 /* Get crypto descriptors */ 231 crp = crypto_getreq(cryptoid, M_NOWAIT); 232 if (crp == NULL) { 233 DPRINTF(("%s: no crypto descriptors\n", __func__)); 234 IPCOMPSTAT_INC(ipcomps_crypto); 235 goto bad; 236 } 237 /* Get IPsec-specific opaque pointer */ 238 xd = malloc(sizeof(*xd), M_XDATA, M_NOWAIT | M_ZERO); 239 if (xd == NULL) { 240 DPRINTF(("%s: cannot allocate xform_data\n", __func__)); 241 IPCOMPSTAT_INC(ipcomps_crypto); 242 crypto_freereq(crp); 243 goto bad; 244 } 245 246 /* Decompression operation */ 247 crp->crp_op = CRYPTO_OP_DECOMPRESS; 248 crp->crp_payload_start = skip + hlen; 249 crp->crp_payload_length = m->m_pkthdr.len - (skip + hlen); 250 251 /* Crypto operation descriptor */ 252 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 253 crp->crp_flags = CRYPTO_F_CBIFSYNC; 254 crp->crp_mbuf = m; 255 crp->crp_buf_type = CRYPTO_BUF_MBUF; 256 crp->crp_callback = ipcomp_input_cb; 257 crp->crp_opaque = xd; 258 259 /* These are passed as-is to the callback */ 260 xd->sav = sav; 261 xd->protoff = protoff; 262 xd->skip = skip; 263 xd->vnet = curvnet; 264 xd->cryptoid = cryptoid; 265 266 SECASVAR_LOCK(sav); 267 crp->crp_session = xd->cryptoid = sav->tdb_cryptoid; 268 SECASVAR_UNLOCK(sav); 269 270 return crypto_dispatch(crp); 271 bad: 272 m_freem(m); 273 key_freesav(&sav); 274 return (error); 275 } 276 277 /* 278 * IPComp input callback from the crypto driver. 279 */ 280 static int 281 ipcomp_input_cb(struct cryptop *crp) 282 { 283 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 284 struct xform_data *xd; 285 struct mbuf *m; 286 struct secasvar *sav; 287 struct secasindex *saidx; 288 caddr_t addr; 289 crypto_session_t cryptoid; 290 int hlen = IPCOMP_HLENGTH, error, clen; 291 int skip, protoff; 292 uint8_t nproto; 293 294 m = crp->crp_mbuf; 295 xd = crp->crp_opaque; 296 CURVNET_SET(xd->vnet); 297 sav = xd->sav; 298 skip = xd->skip; 299 protoff = xd->protoff; 300 cryptoid = xd->cryptoid; 301 saidx = &sav->sah->saidx; 302 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 303 saidx->dst.sa.sa_family == AF_INET6, 304 ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 305 306 /* Check for crypto errors */ 307 if (crp->crp_etype) { 308 if (crp->crp_etype == EAGAIN) { 309 /* Reset the session ID */ 310 if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0) 311 crypto_freesession(cryptoid); 312 xd->cryptoid = crp->crp_session; 313 CURVNET_RESTORE(); 314 return (crypto_dispatch(crp)); 315 } 316 IPCOMPSTAT_INC(ipcomps_noxform); 317 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 318 error = crp->crp_etype; 319 goto bad; 320 } 321 /* Shouldn't happen... */ 322 if (m == NULL) { 323 IPCOMPSTAT_INC(ipcomps_crypto); 324 DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 325 error = EINVAL; 326 goto bad; 327 } 328 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 329 330 clen = crp->crp_olen; /* Length of data after processing */ 331 332 /* Release the crypto descriptors */ 333 free(xd, M_XDATA), xd = NULL; 334 crypto_freereq(crp), crp = NULL; 335 336 /* In case it's not done already, adjust the size of the mbuf chain */ 337 m->m_pkthdr.len = clen + hlen + skip; 338 339 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 340 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 341 DPRINTF(("%s: m_pullup failed\n", __func__)); 342 error = EINVAL; /*XXX*/ 343 goto bad; 344 } 345 346 /* Keep the next protocol field */ 347 addr = (caddr_t) mtod(m, struct ip *) + skip; 348 nproto = ((struct ipcomp *) addr)->comp_nxt; 349 350 /* Remove the IPCOMP header */ 351 error = m_striphdr(m, skip, hlen); 352 if (error) { 353 IPCOMPSTAT_INC(ipcomps_hdrops); 354 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 355 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 356 (u_long) ntohl(sav->spi))); 357 goto bad; 358 } 359 360 /* Restore the Next Protocol field */ 361 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 362 363 switch (saidx->dst.sa.sa_family) { 364 #ifdef INET6 365 case AF_INET6: 366 error = ipsec6_common_input_cb(m, sav, skip, protoff); 367 break; 368 #endif 369 #ifdef INET 370 case AF_INET: 371 error = ipsec4_common_input_cb(m, sav, skip, protoff); 372 break; 373 #endif 374 default: 375 panic("%s: Unexpected address family: %d saidx=%p", __func__, 376 saidx->dst.sa.sa_family, saidx); 377 } 378 CURVNET_RESTORE(); 379 return error; 380 bad: 381 CURVNET_RESTORE(); 382 if (sav != NULL) 383 key_freesav(&sav); 384 if (m != NULL) 385 m_freem(m); 386 if (xd != NULL) 387 free(xd, M_XDATA); 388 if (crp != NULL) 389 crypto_freereq(crp); 390 return error; 391 } 392 393 /* 394 * IPComp output routine, called by ipsec[46]_perform_request() 395 */ 396 static int 397 ipcomp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav, 398 u_int idx, int skip, int protoff) 399 { 400 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 401 const struct comp_algo *ipcompx; 402 struct cryptop *crp; 403 struct xform_data *xd; 404 crypto_session_t cryptoid; 405 int error, ralen, maxpacketsize; 406 407 IPSEC_ASSERT(sav != NULL, ("null SA")); 408 ipcompx = sav->tdb_compalgxform; 409 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 410 411 /* 412 * Do not touch the packet in case our payload to compress 413 * is lower than the minimal threshold of the compression 414 * alogrithm. We will just send out the data uncompressed. 415 * See RFC 3173, 2.2. Non-Expansion Policy. 416 */ 417 if (m->m_pkthdr.len <= ipcompx->minlen) { 418 IPCOMPSTAT_INC(ipcomps_threshold); 419 return ipsec_process_done(m, sp, sav, idx); 420 } 421 422 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 423 IPCOMPSTAT_INC(ipcomps_output); 424 425 /* Check for maximum packet size violations. */ 426 switch (sav->sah->saidx.dst.sa.sa_family) { 427 #ifdef INET 428 case AF_INET: 429 maxpacketsize = IP_MAXPACKET; 430 break; 431 #endif /* INET */ 432 #ifdef INET6 433 case AF_INET6: 434 maxpacketsize = IPV6_MAXPACKET; 435 break; 436 #endif /* INET6 */ 437 default: 438 IPCOMPSTAT_INC(ipcomps_nopf); 439 DPRINTF(("%s: unknown/unsupported protocol family %d, " 440 "IPCA %s/%08lx\n", __func__, 441 sav->sah->saidx.dst.sa.sa_family, 442 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 443 (u_long) ntohl(sav->spi))); 444 error = EPFNOSUPPORT; 445 goto bad; 446 } 447 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 448 IPCOMPSTAT_INC(ipcomps_toobig); 449 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 450 "(len %u, max len %u)\n", __func__, 451 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 452 (u_long) ntohl(sav->spi), 453 ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 454 error = EMSGSIZE; 455 goto bad; 456 } 457 458 /* Update the counters */ 459 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip); 460 461 m = m_unshare(m, M_NOWAIT); 462 if (m == NULL) { 463 IPCOMPSTAT_INC(ipcomps_hdrops); 464 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 465 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 466 sizeof(buf)), (u_long) ntohl(sav->spi))); 467 error = ENOBUFS; 468 goto bad; 469 } 470 471 /* Ok now, we can pass to the crypto processing. */ 472 SECASVAR_LOCK(sav); 473 cryptoid = sav->tdb_cryptoid; 474 SECASVAR_UNLOCK(sav); 475 476 /* Get crypto descriptors */ 477 crp = crypto_getreq(cryptoid, M_NOWAIT); 478 if (crp == NULL) { 479 IPCOMPSTAT_INC(ipcomps_crypto); 480 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 481 error = ENOBUFS; 482 goto bad; 483 } 484 485 /* Compression descriptor */ 486 crp->crp_op = CRYPTO_OP_COMPRESS; 487 crp->crp_payload_start = skip; 488 crp->crp_payload_length = ralen; 489 490 /* IPsec-specific opaque crypto info */ 491 xd = malloc(sizeof(struct xform_data), M_XDATA, M_NOWAIT | M_ZERO); 492 if (xd == NULL) { 493 IPCOMPSTAT_INC(ipcomps_crypto); 494 DPRINTF(("%s: failed to allocate xform_data\n", __func__)); 495 crypto_freereq(crp); 496 error = ENOBUFS; 497 goto bad; 498 } 499 500 xd->sp = sp; 501 xd->sav = sav; 502 xd->idx = idx; 503 xd->skip = skip; 504 xd->protoff = protoff; 505 xd->vnet = curvnet; 506 xd->cryptoid = cryptoid; 507 508 /* Crypto operation descriptor */ 509 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 510 crp->crp_flags = CRYPTO_F_CBIFSYNC; 511 crp->crp_mbuf = m; 512 crp->crp_buf_type = CRYPTO_BUF_MBUF; 513 crp->crp_callback = ipcomp_output_cb; 514 crp->crp_opaque = xd; 515 516 return crypto_dispatch(crp); 517 bad: 518 if (m) 519 m_freem(m); 520 key_freesav(&sav); 521 key_freesp(&sp); 522 return (error); 523 } 524 525 /* 526 * IPComp output callback from the crypto driver. 527 */ 528 static int 529 ipcomp_output_cb(struct cryptop *crp) 530 { 531 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 532 struct xform_data *xd; 533 struct secpolicy *sp; 534 struct secasvar *sav; 535 struct mbuf *m; 536 crypto_session_t cryptoid; 537 u_int idx; 538 int error, skip, protoff; 539 540 m = crp->crp_mbuf; 541 xd = crp->crp_opaque; 542 CURVNET_SET(xd->vnet); 543 idx = xd->idx; 544 sp = xd->sp; 545 sav = xd->sav; 546 skip = xd->skip; 547 protoff = xd->protoff; 548 cryptoid = xd->cryptoid; 549 550 /* Check for crypto errors */ 551 if (crp->crp_etype) { 552 if (crp->crp_etype == EAGAIN) { 553 /* Reset the session ID */ 554 if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0) 555 crypto_freesession(cryptoid); 556 xd->cryptoid = crp->crp_session; 557 CURVNET_RESTORE(); 558 return (crypto_dispatch(crp)); 559 } 560 IPCOMPSTAT_INC(ipcomps_noxform); 561 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 562 error = crp->crp_etype; 563 goto bad; 564 } 565 /* Shouldn't happen... */ 566 if (m == NULL) { 567 IPCOMPSTAT_INC(ipcomps_crypto); 568 DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 569 error = EINVAL; 570 goto bad; 571 } 572 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 573 574 if (crp->crp_payload_length > crp->crp_olen) { 575 struct mbuf *mo; 576 struct ipcomp *ipcomp; 577 int roff; 578 uint8_t prot; 579 580 /* Compression helped, inject IPCOMP header. */ 581 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 582 if (mo == NULL) { 583 IPCOMPSTAT_INC(ipcomps_wrap); 584 DPRINTF(("%s: IPCOMP header inject failed " 585 "for IPCA %s/%08lx\n", 586 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 587 sizeof(buf)), (u_long) ntohl(sav->spi))); 588 error = ENOBUFS; 589 goto bad; 590 } 591 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 592 593 /* Initialize the IPCOMP header */ 594 /* XXX alignment always correct? */ 595 switch (sav->sah->saidx.dst.sa.sa_family) { 596 #ifdef INET 597 case AF_INET: 598 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 599 break; 600 #endif /* INET */ 601 #ifdef INET6 602 case AF_INET6: 603 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 604 break; 605 #endif 606 } 607 ipcomp->comp_flags = 0; 608 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 609 610 /* Fix Next Protocol in IPv4/IPv6 header */ 611 prot = IPPROTO_IPCOMP; 612 m_copyback(m, protoff, sizeof(u_int8_t), 613 (u_char *)&prot); 614 615 /* Adjust the length in the IP header */ 616 switch (sav->sah->saidx.dst.sa.sa_family) { 617 #ifdef INET 618 case AF_INET: 619 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 620 break; 621 #endif /* INET */ 622 #ifdef INET6 623 case AF_INET6: 624 mtod(m, struct ip6_hdr *)->ip6_plen = 625 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 626 break; 627 #endif /* INET6 */ 628 default: 629 IPCOMPSTAT_INC(ipcomps_nopf); 630 DPRINTF(("%s: unknown/unsupported protocol " 631 "family %d, IPCA %s/%08lx\n", __func__, 632 sav->sah->saidx.dst.sa.sa_family, 633 ipsec_address(&sav->sah->saidx.dst, buf, 634 sizeof(buf)), (u_long) ntohl(sav->spi))); 635 error = EPFNOSUPPORT; 636 goto bad; 637 } 638 } else { 639 /* Compression was useless, we have lost time. */ 640 IPCOMPSTAT_INC(ipcomps_uncompr); 641 DPRINTF(("%s: compressions was useless %d <= %d\n", 642 __func__, crp->crp_payload_length, crp->crp_olen)); 643 /* XXX remember state to not compress the next couple 644 * of packets, RFC 3173, 2.2. Non-Expansion Policy */ 645 } 646 647 /* Release the crypto descriptor */ 648 free(xd, M_XDATA); 649 crypto_freereq(crp); 650 651 /* NB: m is reclaimed by ipsec_process_done. */ 652 error = ipsec_process_done(m, sp, sav, idx); 653 CURVNET_RESTORE(); 654 return (error); 655 bad: 656 if (m) 657 m_freem(m); 658 CURVNET_RESTORE(); 659 free(xd, M_XDATA); 660 crypto_freereq(crp); 661 key_freesav(&sav); 662 key_freesp(&sp); 663 return (error); 664 } 665 666 #ifdef INET 667 static int 668 ipcomp4_nonexp_encapcheck(const struct mbuf *m, int off, int proto, 669 void *arg __unused) 670 { 671 union sockaddr_union src, dst; 672 const struct ip *ip; 673 674 if (V_ipcomp_enable == 0) 675 return (0); 676 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6) 677 return (0); 678 bzero(&src, sizeof(src)); 679 bzero(&dst, sizeof(dst)); 680 src.sa.sa_family = dst.sa.sa_family = AF_INET; 681 src.sin.sin_len = dst.sin.sin_len = sizeof(struct sockaddr_in); 682 ip = mtod(m, const struct ip *); 683 src.sin.sin_addr = ip->ip_src; 684 dst.sin.sin_addr = ip->ip_dst; 685 return (ipcomp_encapcheck(&src, &dst)); 686 } 687 688 static const struct encaptab *ipe4_cookie = NULL; 689 static const struct encap_config ipv4_encap_cfg = { 690 .proto = -1, 691 .min_length = sizeof(struct ip), 692 .exact_match = sizeof(in_addr_t) << 4, 693 .check = ipcomp4_nonexp_encapcheck, 694 .input = ipcomp_nonexp_input 695 }; 696 #endif 697 #ifdef INET6 698 static int 699 ipcomp6_nonexp_encapcheck(const struct mbuf *m, int off, int proto, 700 void *arg __unused) 701 { 702 union sockaddr_union src, dst; 703 const struct ip6_hdr *ip6; 704 705 if (V_ipcomp_enable == 0) 706 return (0); 707 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6) 708 return (0); 709 bzero(&src, sizeof(src)); 710 bzero(&dst, sizeof(dst)); 711 src.sa.sa_family = dst.sa.sa_family = AF_INET; 712 src.sin6.sin6_len = dst.sin6.sin6_len = sizeof(struct sockaddr_in6); 713 ip6 = mtod(m, const struct ip6_hdr *); 714 src.sin6.sin6_addr = ip6->ip6_src; 715 dst.sin6.sin6_addr = ip6->ip6_dst; 716 if (IN6_IS_SCOPE_LINKLOCAL(&src.sin6.sin6_addr)) { 717 /* XXX: sa6_recoverscope() */ 718 src.sin6.sin6_scope_id = 719 ntohs(src.sin6.sin6_addr.s6_addr16[1]); 720 src.sin6.sin6_addr.s6_addr16[1] = 0; 721 } 722 if (IN6_IS_SCOPE_LINKLOCAL(&dst.sin6.sin6_addr)) { 723 /* XXX: sa6_recoverscope() */ 724 dst.sin6.sin6_scope_id = 725 ntohs(dst.sin6.sin6_addr.s6_addr16[1]); 726 dst.sin6.sin6_addr.s6_addr16[1] = 0; 727 } 728 return (ipcomp_encapcheck(&src, &dst)); 729 } 730 731 static const struct encaptab *ipe6_cookie = NULL; 732 static const struct encap_config ipv6_encap_cfg = { 733 .proto = -1, 734 .min_length = sizeof(struct ip6_hdr), 735 .exact_match = sizeof(struct in6_addr) << 4, 736 .check = ipcomp6_nonexp_encapcheck, 737 .input = ipcomp_nonexp_input 738 }; 739 #endif 740 741 static struct xformsw ipcomp_xformsw = { 742 .xf_type = XF_IPCOMP, 743 .xf_name = "IPcomp", 744 .xf_init = ipcomp_init, 745 .xf_zeroize = ipcomp_zeroize, 746 .xf_input = ipcomp_input, 747 .xf_output = ipcomp_output, 748 }; 749 750 static void 751 ipcomp_attach(void) 752 { 753 754 #ifdef INET 755 ipe4_cookie = ip_encap_attach(&ipv4_encap_cfg, NULL, M_WAITOK); 756 #endif 757 #ifdef INET6 758 ipe6_cookie = ip6_encap_attach(&ipv6_encap_cfg, NULL, M_WAITOK); 759 #endif 760 xform_attach(&ipcomp_xformsw); 761 } 762 763 static void 764 ipcomp_detach(void) 765 { 766 767 #ifdef INET 768 ip_encap_detach(ipe4_cookie); 769 #endif 770 #ifdef INET6 771 ip6_encap_detach(ipe6_cookie); 772 #endif 773 xform_detach(&ipcomp_xformsw); 774 } 775 776 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 777 ipcomp_attach, NULL); 778 SYSUNINIT(ipcomp_xform_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 779 ipcomp_detach, NULL); 780