1 /* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org) 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* IP payload compression protocol (IPComp), see RFC 2393 */ 33 #include "opt_inet.h" 34 #include "opt_inet6.h" 35 #include "opt_ipsec.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/lock.h> 42 #include <sys/mutex.h> 43 #include <sys/socket.h> 44 #include <sys/kernel.h> 45 #include <sys/protosw.h> 46 #include <sys/sysctl.h> 47 48 #include <netinet/in.h> 49 #include <netinet/in_systm.h> 50 #include <netinet/ip.h> 51 #include <netinet/ip_var.h> 52 #include <netinet/ip_encap.h> 53 54 #include <net/netisr.h> 55 #include <net/vnet.h> 56 #include <net/if.h> /* XXXGL: net_epoch should move out there */ 57 #include <net/if_var.h> /* XXXGL: net_epoch should move out there */ 58 59 #include <netipsec/ipsec.h> 60 #include <netipsec/xform.h> 61 62 #ifdef INET6 63 #include <netinet/ip6.h> 64 #include <netinet6/ip6_var.h> 65 #include <netipsec/ipsec6.h> 66 #endif 67 68 #include <netipsec/ipcomp.h> 69 #include <netipsec/ipcomp_var.h> 70 71 #include <netipsec/key.h> 72 #include <netipsec/key_debug.h> 73 74 #include <opencrypto/cryptodev.h> 75 #include <opencrypto/deflate.h> 76 #include <opencrypto/xform.h> 77 78 VNET_DEFINE(int, ipcomp_enable) = 1; 79 VNET_PCPUSTAT_DEFINE(struct ipcompstat, ipcompstat); 80 VNET_PCPUSTAT_SYSINIT(ipcompstat); 81 82 #ifdef VIMAGE 83 VNET_PCPUSTAT_SYSUNINIT(ipcompstat); 84 #endif /* VIMAGE */ 85 86 SYSCTL_DECL(_net_inet_ipcomp); 87 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, ipcomp_enable, 88 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, ""); 89 SYSCTL_VNET_PCPUSTAT(_net_inet_ipcomp, IPSECCTL_STATS, stats, 90 struct ipcompstat, ipcompstat, 91 "IPCOMP statistics (struct ipcompstat, netipsec/ipcomp_var.h"); 92 93 static MALLOC_DEFINE(M_IPCOMP, "ipcomp", "IPCOMP"); 94 95 static int ipcomp_input_cb(struct cryptop *crp); 96 static int ipcomp_output_cb(struct cryptop *crp); 97 98 /* 99 * RFC 3173 p 2.2. Non-Expansion Policy: 100 * If the total size of a compressed payload and the IPComp header, as 101 * defined in section 3, is not smaller than the size of the original 102 * payload, the IP datagram MUST be sent in the original non-compressed 103 * form. 104 * 105 * When we use IPComp in tunnel mode, for small packets we will receive 106 * encapsulated IP-IP datagrams without any compression and without IPComp 107 * header. 108 */ 109 static int 110 ipcomp_encapcheck(union sockaddr_union *src, union sockaddr_union *dst) 111 { 112 struct secasvar *sav; 113 114 sav = key_allocsa_tunnel(src, dst, IPPROTO_IPCOMP); 115 if (sav == NULL) 116 return (0); 117 key_freesav(&sav); 118 119 if (src->sa.sa_family == AF_INET) 120 return (sizeof(struct in_addr) << 4); 121 else 122 return (sizeof(struct in6_addr) << 4); 123 } 124 125 static int 126 ipcomp_nonexp_input(struct mbuf *m, int off, int proto, void *arg __unused) 127 { 128 int isr; 129 130 NET_EPOCH_ASSERT(); 131 132 switch (proto) { 133 #ifdef INET 134 case IPPROTO_IPV4: 135 isr = NETISR_IP; 136 break; 137 #endif 138 #ifdef INET6 139 case IPPROTO_IPV6: 140 isr = NETISR_IPV6; 141 break; 142 #endif 143 default: 144 IPCOMPSTAT_INC(ipcomps_nopf); 145 m_freem(m); 146 return (IPPROTO_DONE); 147 } 148 m_adj(m, off); 149 IPCOMPSTAT_ADD(ipcomps_ibytes, m->m_pkthdr.len); 150 IPCOMPSTAT_INC(ipcomps_input); 151 netisr_dispatch(isr, m); 152 return (IPPROTO_DONE); 153 } 154 155 /* 156 * ipcomp_init() is called when an CPI is being set up. 157 */ 158 static int 159 ipcomp_init(struct secasvar *sav, struct xformsw *xsp) 160 { 161 const struct comp_algo *tcomp; 162 struct crypto_session_params csp; 163 164 /* NB: algorithm really comes in alg_enc and not alg_comp! */ 165 tcomp = comp_algorithm_lookup(sav->alg_enc); 166 if (tcomp == NULL) { 167 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__, 168 sav->alg_comp)); 169 return EINVAL; 170 } 171 sav->alg_comp = sav->alg_enc; /* set for doing histogram */ 172 sav->tdb_xform = xsp; 173 sav->tdb_compalgxform = tcomp; 174 175 /* Initialize crypto session */ 176 memset(&csp, 0, sizeof(csp)); 177 csp.csp_mode = CSP_MODE_COMPRESS; 178 csp.csp_cipher_alg = sav->tdb_compalgxform->type; 179 180 return crypto_newsession(&sav->tdb_cryptoid, &csp, V_crypto_support); 181 } 182 183 /* 184 * ipcomp_cleanup() used when IPCA is deleted 185 */ 186 static void 187 ipcomp_cleanup(struct secasvar *sav) 188 { 189 190 crypto_freesession(sav->tdb_cryptoid); 191 sav->tdb_cryptoid = NULL; 192 } 193 194 /* 195 * ipcomp_input() gets called to uncompress an input packet 196 */ 197 static int 198 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 199 { 200 struct xform_data *xd; 201 struct cryptop *crp; 202 struct ipcomp *ipcomp; 203 crypto_session_t cryptoid; 204 caddr_t addr; 205 int error, hlen = IPCOMP_HLENGTH; 206 207 SECASVAR_RLOCK_TRACKER; 208 209 /* 210 * Check that the next header of the IPComp is not IPComp again, before 211 * doing any real work. Given it is not possible to do double 212 * compression it means someone is playing tricks on us. 213 */ 214 error = ENOBUFS; 215 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 216 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 217 DPRINTF(("%s: m_pullup failed\n", __func__)); 218 key_freesav(&sav); 219 return (error); 220 } 221 addr = (caddr_t) mtod(m, struct ip *) + skip; 222 ipcomp = (struct ipcomp *)addr; 223 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) { 224 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */ 225 DPRINTF(("%s: recursive compression detected\n", __func__)); 226 error = EINVAL; 227 goto bad; 228 } 229 230 SECASVAR_RLOCK(sav); 231 cryptoid = sav->tdb_cryptoid; 232 SECASVAR_RUNLOCK(sav); 233 234 /* Get crypto descriptors */ 235 crp = crypto_getreq(cryptoid, M_NOWAIT); 236 if (crp == NULL) { 237 DPRINTF(("%s: no crypto descriptors\n", __func__)); 238 IPCOMPSTAT_INC(ipcomps_crypto); 239 goto bad; 240 } 241 /* Get IPsec-specific opaque pointer */ 242 xd = malloc(sizeof(*xd), M_IPCOMP, M_NOWAIT | M_ZERO); 243 if (xd == NULL) { 244 DPRINTF(("%s: cannot allocate xform_data\n", __func__)); 245 IPCOMPSTAT_INC(ipcomps_crypto); 246 crypto_freereq(crp); 247 goto bad; 248 } 249 250 /* Decompression operation */ 251 crp->crp_op = CRYPTO_OP_DECOMPRESS; 252 crp->crp_payload_start = skip + hlen; 253 crp->crp_payload_length = m->m_pkthdr.len - (skip + hlen); 254 255 /* Crypto operation descriptor */ 256 crp->crp_flags = CRYPTO_F_CBIFSYNC; 257 crypto_use_mbuf(crp, m); 258 crp->crp_callback = ipcomp_input_cb; 259 crp->crp_opaque = xd; 260 261 /* These are passed as-is to the callback */ 262 xd->sav = sav; 263 xd->protoff = protoff; 264 xd->skip = skip; 265 xd->vnet = curvnet; 266 xd->cryptoid = cryptoid; 267 268 SECASVAR_RLOCK(sav); 269 crp->crp_session = xd->cryptoid = sav->tdb_cryptoid; 270 SECASVAR_RUNLOCK(sav); 271 272 return crypto_dispatch(crp); 273 bad: 274 m_freem(m); 275 key_freesav(&sav); 276 return (error); 277 } 278 279 /* 280 * IPComp input callback from the crypto driver. 281 */ 282 static int 283 ipcomp_input_cb(struct cryptop *crp) 284 { 285 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 286 struct xform_data *xd; 287 struct mbuf *m; 288 struct secasvar *sav; 289 struct secasindex *saidx; 290 caddr_t addr; 291 crypto_session_t cryptoid; 292 int hlen = IPCOMP_HLENGTH, error, clen; 293 int skip, protoff; 294 uint8_t nproto; 295 296 m = crp->crp_buf.cb_mbuf; 297 xd = crp->crp_opaque; 298 CURVNET_SET(xd->vnet); 299 sav = xd->sav; 300 skip = xd->skip; 301 protoff = xd->protoff; 302 cryptoid = xd->cryptoid; 303 saidx = &sav->sah->saidx; 304 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 305 saidx->dst.sa.sa_family == AF_INET6, 306 ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 307 308 /* Check for crypto errors */ 309 if (crp->crp_etype) { 310 if (crp->crp_etype == EAGAIN) { 311 /* Reset the session ID */ 312 if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0) 313 crypto_freesession(cryptoid); 314 xd->cryptoid = crp->crp_session; 315 CURVNET_RESTORE(); 316 return (crypto_dispatch(crp)); 317 } 318 IPCOMPSTAT_INC(ipcomps_noxform); 319 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 320 error = crp->crp_etype; 321 goto bad; 322 } 323 /* Shouldn't happen... */ 324 if (m == NULL) { 325 IPCOMPSTAT_INC(ipcomps_crypto); 326 DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 327 error = EINVAL; 328 goto bad; 329 } 330 IPCOMPSTAT_INC2(ipcomps_hist, sav->alg_comp); 331 332 clen = crp->crp_olen; /* Length of data after processing */ 333 334 /* Release the crypto descriptors */ 335 free(xd, M_IPCOMP), xd = NULL; 336 crypto_freereq(crp), crp = NULL; 337 338 /* In case it's not done already, adjust the size of the mbuf chain */ 339 m->m_pkthdr.len = clen + hlen + skip; 340 341 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 342 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 343 DPRINTF(("%s: m_pullup failed\n", __func__)); 344 error = EINVAL; /*XXX*/ 345 goto bad; 346 } 347 348 /* Keep the next protocol field */ 349 addr = (caddr_t) mtod(m, struct ip *) + skip; 350 nproto = ((struct ipcomp *) addr)->comp_nxt; 351 352 /* Remove the IPCOMP header */ 353 error = m_striphdr(m, skip, hlen); 354 if (error) { 355 IPCOMPSTAT_INC(ipcomps_hdrops); 356 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 357 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 358 (u_long) ntohl(sav->spi))); 359 goto bad; 360 } 361 362 /* Restore the Next Protocol field */ 363 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 364 365 switch (saidx->dst.sa.sa_family) { 366 #ifdef INET6 367 case AF_INET6: 368 error = ipsec6_common_input_cb(m, sav, skip, protoff); 369 break; 370 #endif 371 #ifdef INET 372 case AF_INET: 373 error = ipsec4_common_input_cb(m, sav, skip, protoff); 374 break; 375 #endif 376 default: 377 panic("%s: Unexpected address family: %d saidx=%p", __func__, 378 saidx->dst.sa.sa_family, saidx); 379 } 380 CURVNET_RESTORE(); 381 return error; 382 bad: 383 CURVNET_RESTORE(); 384 if (sav != NULL) 385 key_freesav(&sav); 386 if (m != NULL) 387 m_freem(m); 388 if (xd != NULL) 389 free(xd, M_IPCOMP); 390 if (crp != NULL) 391 crypto_freereq(crp); 392 return error; 393 } 394 395 /* 396 * IPComp output routine, called by ipsec[46]_perform_request() 397 */ 398 static int 399 ipcomp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav, 400 u_int idx, int skip, int protoff) 401 { 402 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 403 const struct comp_algo *ipcompx; 404 struct cryptop *crp; 405 struct xform_data *xd; 406 crypto_session_t cryptoid; 407 int error, ralen, maxpacketsize; 408 409 SECASVAR_RLOCK_TRACKER; 410 411 IPSEC_ASSERT(sav != NULL, ("null SA")); 412 ipcompx = sav->tdb_compalgxform; 413 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 414 415 /* 416 * Do not touch the packet in case our payload to compress 417 * is lower than the minimal threshold of the compression 418 * alogrithm. We will just send out the data uncompressed. 419 * See RFC 3173, 2.2. Non-Expansion Policy. 420 */ 421 if (m->m_pkthdr.len <= ipcompx->minlen) { 422 IPCOMPSTAT_INC(ipcomps_threshold); 423 return ipsec_process_done(m, sp, sav, idx); 424 } 425 426 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 427 IPCOMPSTAT_INC(ipcomps_output); 428 429 /* Check for maximum packet size violations. */ 430 switch (sav->sah->saidx.dst.sa.sa_family) { 431 #ifdef INET 432 case AF_INET: 433 maxpacketsize = IP_MAXPACKET; 434 break; 435 #endif /* INET */ 436 #ifdef INET6 437 case AF_INET6: 438 maxpacketsize = IPV6_MAXPACKET; 439 break; 440 #endif /* INET6 */ 441 default: 442 IPCOMPSTAT_INC(ipcomps_nopf); 443 DPRINTF(("%s: unknown/unsupported protocol family %d, " 444 "IPCA %s/%08lx\n", __func__, 445 sav->sah->saidx.dst.sa.sa_family, 446 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 447 (u_long) ntohl(sav->spi))); 448 error = EPFNOSUPPORT; 449 goto bad; 450 } 451 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 452 IPCOMPSTAT_INC(ipcomps_toobig); 453 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 454 "(len %u, max len %u)\n", __func__, 455 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 456 (u_long) ntohl(sav->spi), 457 ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 458 error = EMSGSIZE; 459 goto bad; 460 } 461 462 /* Update the counters */ 463 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip); 464 465 m = m_unshare(m, M_NOWAIT); 466 if (m == NULL) { 467 IPCOMPSTAT_INC(ipcomps_hdrops); 468 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 469 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 470 sizeof(buf)), (u_long) ntohl(sav->spi))); 471 error = ENOBUFS; 472 goto bad; 473 } 474 475 /* Ok now, we can pass to the crypto processing. */ 476 SECASVAR_RLOCK(sav); 477 cryptoid = sav->tdb_cryptoid; 478 SECASVAR_RUNLOCK(sav); 479 480 /* Get crypto descriptors */ 481 crp = crypto_getreq(cryptoid, M_NOWAIT); 482 if (crp == NULL) { 483 IPCOMPSTAT_INC(ipcomps_crypto); 484 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 485 error = ENOBUFS; 486 goto bad; 487 } 488 489 /* Compression descriptor */ 490 crp->crp_op = CRYPTO_OP_COMPRESS; 491 crp->crp_payload_start = skip; 492 crp->crp_payload_length = ralen; 493 494 /* IPsec-specific opaque crypto info */ 495 xd = malloc(sizeof(struct xform_data), M_IPCOMP, M_NOWAIT | M_ZERO); 496 if (xd == NULL) { 497 IPCOMPSTAT_INC(ipcomps_crypto); 498 DPRINTF(("%s: failed to allocate xform_data\n", __func__)); 499 crypto_freereq(crp); 500 error = ENOBUFS; 501 goto bad; 502 } 503 504 xd->sp = sp; 505 xd->sav = sav; 506 xd->idx = idx; 507 xd->skip = skip; 508 xd->protoff = protoff; 509 xd->vnet = curvnet; 510 xd->cryptoid = cryptoid; 511 512 /* Crypto operation descriptor */ 513 crp->crp_flags = CRYPTO_F_CBIFSYNC; 514 crypto_use_mbuf(crp, m); 515 crp->crp_callback = ipcomp_output_cb; 516 crp->crp_opaque = xd; 517 518 return crypto_dispatch(crp); 519 bad: 520 if (m) 521 m_freem(m); 522 key_freesav(&sav); 523 key_freesp(&sp); 524 return (error); 525 } 526 527 /* 528 * IPComp output callback from the crypto driver. 529 */ 530 static int 531 ipcomp_output_cb(struct cryptop *crp) 532 { 533 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 534 struct xform_data *xd; 535 struct secpolicy *sp; 536 struct secasvar *sav; 537 struct mbuf *m; 538 crypto_session_t cryptoid; 539 u_int idx; 540 int error, skip, protoff; 541 542 m = crp->crp_buf.cb_mbuf; 543 xd = crp->crp_opaque; 544 CURVNET_SET(xd->vnet); 545 idx = xd->idx; 546 sp = xd->sp; 547 sav = xd->sav; 548 skip = xd->skip; 549 protoff = xd->protoff; 550 cryptoid = xd->cryptoid; 551 552 /* Check for crypto errors */ 553 if (crp->crp_etype) { 554 if (crp->crp_etype == EAGAIN) { 555 /* Reset the session ID */ 556 if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0) 557 crypto_freesession(cryptoid); 558 xd->cryptoid = crp->crp_session; 559 CURVNET_RESTORE(); 560 return (crypto_dispatch(crp)); 561 } 562 IPCOMPSTAT_INC(ipcomps_noxform); 563 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 564 error = crp->crp_etype; 565 goto bad; 566 } 567 /* Shouldn't happen... */ 568 if (m == NULL) { 569 IPCOMPSTAT_INC(ipcomps_crypto); 570 DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 571 error = EINVAL; 572 goto bad; 573 } 574 IPCOMPSTAT_INC2(ipcomps_hist, sav->alg_comp); 575 576 if (crp->crp_payload_length > crp->crp_olen) { 577 struct mbuf *mo; 578 struct ipcomp *ipcomp; 579 int roff; 580 uint8_t prot; 581 582 /* Compression helped, inject IPCOMP header. */ 583 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 584 if (mo == NULL) { 585 IPCOMPSTAT_INC(ipcomps_wrap); 586 DPRINTF(("%s: IPCOMP header inject failed " 587 "for IPCA %s/%08lx\n", 588 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 589 sizeof(buf)), (u_long) ntohl(sav->spi))); 590 error = ENOBUFS; 591 goto bad; 592 } 593 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 594 595 /* Initialize the IPCOMP header */ 596 /* XXX alignment always correct? */ 597 switch (sav->sah->saidx.dst.sa.sa_family) { 598 #ifdef INET 599 case AF_INET: 600 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 601 break; 602 #endif /* INET */ 603 #ifdef INET6 604 case AF_INET6: 605 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 606 break; 607 #endif 608 } 609 ipcomp->comp_flags = 0; 610 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 611 612 /* Fix Next Protocol in IPv4/IPv6 header */ 613 prot = IPPROTO_IPCOMP; 614 m_copyback(m, protoff, sizeof(u_int8_t), 615 (u_char *)&prot); 616 617 /* Adjust the length in the IP header */ 618 switch (sav->sah->saidx.dst.sa.sa_family) { 619 #ifdef INET 620 case AF_INET: 621 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 622 break; 623 #endif /* INET */ 624 #ifdef INET6 625 case AF_INET6: 626 mtod(m, struct ip6_hdr *)->ip6_plen = 627 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 628 break; 629 #endif /* INET6 */ 630 default: 631 IPCOMPSTAT_INC(ipcomps_nopf); 632 DPRINTF(("%s: unknown/unsupported protocol " 633 "family %d, IPCA %s/%08lx\n", __func__, 634 sav->sah->saidx.dst.sa.sa_family, 635 ipsec_address(&sav->sah->saidx.dst, buf, 636 sizeof(buf)), (u_long) ntohl(sav->spi))); 637 error = EPFNOSUPPORT; 638 goto bad; 639 } 640 } else { 641 /* Compression was useless, we have lost time. */ 642 IPCOMPSTAT_INC(ipcomps_uncompr); 643 DPRINTF(("%s: compressions was useless %d <= %d\n", 644 __func__, crp->crp_payload_length, crp->crp_olen)); 645 /* XXX remember state to not compress the next couple 646 * of packets, RFC 3173, 2.2. Non-Expansion Policy */ 647 } 648 649 /* Release the crypto descriptor */ 650 free(xd, M_IPCOMP); 651 crypto_freereq(crp); 652 653 /* NB: m is reclaimed by ipsec_process_done. */ 654 error = ipsec_process_done(m, sp, sav, idx); 655 CURVNET_RESTORE(); 656 return (error); 657 bad: 658 if (m) 659 m_freem(m); 660 CURVNET_RESTORE(); 661 free(xd, M_IPCOMP); 662 crypto_freereq(crp); 663 key_freesav(&sav); 664 key_freesp(&sp); 665 return (error); 666 } 667 668 #ifdef INET 669 static int 670 ipcomp4_nonexp_encapcheck(const struct mbuf *m, int off, int proto, 671 void *arg __unused) 672 { 673 union sockaddr_union src, dst; 674 const struct ip *ip; 675 676 if (V_ipcomp_enable == 0) 677 return (0); 678 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6) 679 return (0); 680 bzero(&src, sizeof(src)); 681 bzero(&dst, sizeof(dst)); 682 src.sa.sa_family = dst.sa.sa_family = AF_INET; 683 src.sin.sin_len = dst.sin.sin_len = sizeof(struct sockaddr_in); 684 ip = mtod(m, const struct ip *); 685 src.sin.sin_addr = ip->ip_src; 686 dst.sin.sin_addr = ip->ip_dst; 687 return (ipcomp_encapcheck(&src, &dst)); 688 } 689 690 static const struct encaptab *ipe4_cookie = NULL; 691 static const struct encap_config ipv4_encap_cfg = { 692 .proto = -1, 693 .min_length = sizeof(struct ip), 694 .exact_match = sizeof(in_addr_t) << 4, 695 .check = ipcomp4_nonexp_encapcheck, 696 .input = ipcomp_nonexp_input 697 }; 698 #endif 699 #ifdef INET6 700 static int 701 ipcomp6_nonexp_encapcheck(const struct mbuf *m, int off, int proto, 702 void *arg __unused) 703 { 704 union sockaddr_union src, dst; 705 const struct ip6_hdr *ip6; 706 707 if (V_ipcomp_enable == 0) 708 return (0); 709 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6) 710 return (0); 711 bzero(&src, sizeof(src)); 712 bzero(&dst, sizeof(dst)); 713 src.sa.sa_family = dst.sa.sa_family = AF_INET; 714 src.sin6.sin6_len = dst.sin6.sin6_len = sizeof(struct sockaddr_in6); 715 ip6 = mtod(m, const struct ip6_hdr *); 716 src.sin6.sin6_addr = ip6->ip6_src; 717 dst.sin6.sin6_addr = ip6->ip6_dst; 718 if (IN6_IS_SCOPE_LINKLOCAL(&src.sin6.sin6_addr)) { 719 /* XXX: sa6_recoverscope() */ 720 src.sin6.sin6_scope_id = 721 ntohs(src.sin6.sin6_addr.s6_addr16[1]); 722 src.sin6.sin6_addr.s6_addr16[1] = 0; 723 } 724 if (IN6_IS_SCOPE_LINKLOCAL(&dst.sin6.sin6_addr)) { 725 /* XXX: sa6_recoverscope() */ 726 dst.sin6.sin6_scope_id = 727 ntohs(dst.sin6.sin6_addr.s6_addr16[1]); 728 dst.sin6.sin6_addr.s6_addr16[1] = 0; 729 } 730 return (ipcomp_encapcheck(&src, &dst)); 731 } 732 733 static const struct encaptab *ipe6_cookie = NULL; 734 static const struct encap_config ipv6_encap_cfg = { 735 .proto = -1, 736 .min_length = sizeof(struct ip6_hdr), 737 .exact_match = sizeof(struct in6_addr) << 4, 738 .check = ipcomp6_nonexp_encapcheck, 739 .input = ipcomp_nonexp_input 740 }; 741 #endif 742 743 static struct xformsw ipcomp_xformsw = { 744 .xf_type = XF_IPCOMP, 745 .xf_name = "IPcomp", 746 .xf_init = ipcomp_init, 747 .xf_cleanup = ipcomp_cleanup, 748 .xf_input = ipcomp_input, 749 .xf_output = ipcomp_output, 750 }; 751 752 static void 753 ipcomp_attach(void) 754 { 755 756 #ifdef INET 757 ipe4_cookie = ip_encap_attach(&ipv4_encap_cfg, NULL, M_WAITOK); 758 #endif 759 #ifdef INET6 760 ipe6_cookie = ip6_encap_attach(&ipv6_encap_cfg, NULL, M_WAITOK); 761 #endif 762 xform_attach(&ipcomp_xformsw); 763 } 764 765 static void 766 ipcomp_detach(void) 767 { 768 769 #ifdef INET 770 ip_encap_detach(ipe4_cookie); 771 #endif 772 #ifdef INET6 773 ip6_encap_detach(ipe6_cookie); 774 #endif 775 xform_detach(&ipcomp_xformsw); 776 } 777 778 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 779 ipcomp_attach, NULL); 780 SYSUNINIT(ipcomp_xform_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 781 ipcomp_detach, NULL); 782