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 #include "opt_ipsec.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/malloc.h> 41 #include <sys/mbuf.h> 42 #include <sys/lock.h> 43 #include <sys/mutex.h> 44 #include <sys/socket.h> 45 #include <sys/kernel.h> 46 #include <sys/protosw.h> 47 #include <sys/sysctl.h> 48 49 #include <netinet/in.h> 50 #include <netinet/in_systm.h> 51 #include <netinet/ip.h> 52 #include <netinet/ip_var.h> 53 #include <netinet/ip_encap.h> 54 55 #include <net/netisr.h> 56 #include <net/vnet.h> 57 #include <net/if.h> /* XXXGL: net_epoch should move out there */ 58 #include <net/if_var.h> /* XXXGL: net_epoch should move out there */ 59 60 #include <netipsec/ipsec.h> 61 #include <netipsec/xform.h> 62 63 #ifdef INET6 64 #include <netinet/ip6.h> 65 #include <netinet6/ip6_var.h> 66 #include <netipsec/ipsec6.h> 67 #endif 68 69 #include <netipsec/ipcomp.h> 70 #include <netipsec/ipcomp_var.h> 71 72 #include <netipsec/key.h> 73 #include <netipsec/key_debug.h> 74 75 #include <opencrypto/cryptodev.h> 76 #include <opencrypto/deflate.h> 77 #include <opencrypto/xform.h> 78 79 VNET_DEFINE(int, ipcomp_enable) = 1; 80 VNET_PCPUSTAT_DEFINE(struct ipcompstat, ipcompstat); 81 VNET_PCPUSTAT_SYSINIT(ipcompstat); 82 83 #ifdef VIMAGE 84 VNET_PCPUSTAT_SYSUNINIT(ipcompstat); 85 #endif /* VIMAGE */ 86 87 SYSCTL_DECL(_net_inet_ipcomp); 88 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, ipcomp_enable, 89 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, ""); 90 SYSCTL_VNET_PCPUSTAT(_net_inet_ipcomp, IPSECCTL_STATS, stats, 91 struct ipcompstat, ipcompstat, 92 "IPCOMP statistics (struct ipcompstat, netipsec/ipcomp_var.h"); 93 94 static MALLOC_DEFINE(M_IPCOMP, "ipcomp", "IPCOMP"); 95 96 static int ipcomp_input_cb(struct cryptop *crp); 97 static int ipcomp_output_cb(struct cryptop *crp); 98 99 /* 100 * RFC 3173 p 2.2. Non-Expansion Policy: 101 * If the total size of a compressed payload and the IPComp header, as 102 * defined in section 3, is not smaller than the size of the original 103 * payload, the IP datagram MUST be sent in the original non-compressed 104 * form. 105 * 106 * When we use IPComp in tunnel mode, for small packets we will receive 107 * encapsulated IP-IP datagrams without any compression and without IPComp 108 * header. 109 */ 110 static int 111 ipcomp_encapcheck(union sockaddr_union *src, union sockaddr_union *dst) 112 { 113 struct secasvar *sav; 114 115 sav = key_allocsa_tunnel(src, dst, IPPROTO_IPCOMP); 116 if (sav == NULL) 117 return (0); 118 key_freesav(&sav); 119 120 if (src->sa.sa_family == AF_INET) 121 return (sizeof(struct in_addr) << 4); 122 else 123 return (sizeof(struct in6_addr) << 4); 124 } 125 126 static int 127 ipcomp_nonexp_input(struct mbuf *m, int off, int proto, void *arg __unused) 128 { 129 int isr; 130 131 NET_EPOCH_ASSERT(); 132 133 switch (proto) { 134 #ifdef INET 135 case IPPROTO_IPV4: 136 isr = NETISR_IP; 137 break; 138 #endif 139 #ifdef INET6 140 case IPPROTO_IPV6: 141 isr = NETISR_IPV6; 142 break; 143 #endif 144 default: 145 IPCOMPSTAT_INC(ipcomps_nopf); 146 m_freem(m); 147 return (IPPROTO_DONE); 148 } 149 m_adj(m, off); 150 IPCOMPSTAT_ADD(ipcomps_ibytes, m->m_pkthdr.len); 151 IPCOMPSTAT_INC(ipcomps_input); 152 netisr_dispatch(isr, m); 153 return (IPPROTO_DONE); 154 } 155 156 /* 157 * ipcomp_init() is called when an CPI is being set up. 158 */ 159 static int 160 ipcomp_init(struct secasvar *sav, struct xformsw *xsp) 161 { 162 const struct comp_algo *tcomp; 163 struct crypto_session_params csp; 164 165 /* NB: algorithm really comes in alg_enc and not alg_comp! */ 166 tcomp = comp_algorithm_lookup(sav->alg_enc); 167 if (tcomp == NULL) { 168 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__, 169 sav->alg_comp)); 170 return EINVAL; 171 } 172 sav->alg_comp = sav->alg_enc; /* set for doing histogram */ 173 sav->tdb_xform = xsp; 174 sav->tdb_compalgxform = tcomp; 175 176 /* Initialize crypto session */ 177 memset(&csp, 0, sizeof(csp)); 178 csp.csp_mode = CSP_MODE_COMPRESS; 179 csp.csp_cipher_alg = sav->tdb_compalgxform->type; 180 181 return crypto_newsession(&sav->tdb_cryptoid, &csp, V_crypto_support); 182 } 183 184 /* 185 * ipcomp_cleanup() used when IPCA is deleted 186 */ 187 static void 188 ipcomp_cleanup(struct secasvar *sav) 189 { 190 191 crypto_freesession(sav->tdb_cryptoid); 192 sav->tdb_cryptoid = NULL; 193 } 194 195 /* 196 * ipcomp_input() gets called to uncompress an input packet 197 */ 198 static int 199 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 200 { 201 struct xform_data *xd; 202 struct cryptop *crp; 203 struct ipcomp *ipcomp; 204 crypto_session_t cryptoid; 205 caddr_t addr; 206 int error, hlen = IPCOMP_HLENGTH; 207 208 SECASVAR_RLOCK_TRACKER; 209 210 /* 211 * Check that the next header of the IPComp is not IPComp again, before 212 * doing any real work. Given it is not possible to do double 213 * compression it means someone is playing tricks on us. 214 */ 215 error = ENOBUFS; 216 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 217 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 218 DPRINTF(("%s: m_pullup failed\n", __func__)); 219 key_freesav(&sav); 220 return (error); 221 } 222 addr = (caddr_t) mtod(m, struct ip *) + skip; 223 ipcomp = (struct ipcomp *)addr; 224 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) { 225 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */ 226 DPRINTF(("%s: recursive compression detected\n", __func__)); 227 error = EINVAL; 228 goto bad; 229 } 230 231 SECASVAR_RLOCK(sav); 232 cryptoid = sav->tdb_cryptoid; 233 SECASVAR_RUNLOCK(sav); 234 235 /* Get crypto descriptors */ 236 crp = crypto_getreq(cryptoid, M_NOWAIT); 237 if (crp == NULL) { 238 DPRINTF(("%s: no crypto descriptors\n", __func__)); 239 IPCOMPSTAT_INC(ipcomps_crypto); 240 goto bad; 241 } 242 /* Get IPsec-specific opaque pointer */ 243 xd = malloc(sizeof(*xd), M_IPCOMP, M_NOWAIT | M_ZERO); 244 if (xd == NULL) { 245 DPRINTF(("%s: cannot allocate xform_data\n", __func__)); 246 IPCOMPSTAT_INC(ipcomps_crypto); 247 crypto_freereq(crp); 248 goto bad; 249 } 250 251 /* Decompression operation */ 252 crp->crp_op = CRYPTO_OP_DECOMPRESS; 253 crp->crp_payload_start = skip + hlen; 254 crp->crp_payload_length = m->m_pkthdr.len - (skip + hlen); 255 256 /* Crypto operation descriptor */ 257 crp->crp_flags = CRYPTO_F_CBIFSYNC; 258 crypto_use_mbuf(crp, m); 259 crp->crp_callback = ipcomp_input_cb; 260 crp->crp_opaque = xd; 261 262 /* These are passed as-is to the callback */ 263 xd->sav = sav; 264 xd->protoff = protoff; 265 xd->skip = skip; 266 xd->vnet = curvnet; 267 xd->cryptoid = cryptoid; 268 269 SECASVAR_RLOCK(sav); 270 crp->crp_session = xd->cryptoid = sav->tdb_cryptoid; 271 SECASVAR_RUNLOCK(sav); 272 273 return crypto_dispatch(crp); 274 bad: 275 m_freem(m); 276 key_freesav(&sav); 277 return (error); 278 } 279 280 /* 281 * IPComp input callback from the crypto driver. 282 */ 283 static int 284 ipcomp_input_cb(struct cryptop *crp) 285 { 286 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 287 struct xform_data *xd; 288 struct mbuf *m; 289 struct secasvar *sav; 290 struct secasindex *saidx; 291 caddr_t addr; 292 crypto_session_t cryptoid; 293 int hlen = IPCOMP_HLENGTH, error, clen; 294 int skip, protoff; 295 uint8_t nproto; 296 297 m = crp->crp_buf.cb_mbuf; 298 xd = crp->crp_opaque; 299 CURVNET_SET(xd->vnet); 300 sav = xd->sav; 301 skip = xd->skip; 302 protoff = xd->protoff; 303 cryptoid = xd->cryptoid; 304 saidx = &sav->sah->saidx; 305 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 306 saidx->dst.sa.sa_family == AF_INET6, 307 ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 308 309 /* Check for crypto errors */ 310 if (crp->crp_etype) { 311 if (crp->crp_etype == EAGAIN) { 312 /* Reset the session ID */ 313 if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0) 314 crypto_freesession(cryptoid); 315 xd->cryptoid = crp->crp_session; 316 CURVNET_RESTORE(); 317 return (crypto_dispatch(crp)); 318 } 319 IPCOMPSTAT_INC(ipcomps_noxform); 320 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 321 error = crp->crp_etype; 322 goto bad; 323 } 324 /* Shouldn't happen... */ 325 if (m == NULL) { 326 IPCOMPSTAT_INC(ipcomps_crypto); 327 DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 328 error = EINVAL; 329 goto bad; 330 } 331 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 332 333 clen = crp->crp_olen; /* Length of data after processing */ 334 335 /* Release the crypto descriptors */ 336 free(xd, M_IPCOMP), xd = NULL; 337 crypto_freereq(crp), crp = NULL; 338 339 /* In case it's not done already, adjust the size of the mbuf chain */ 340 m->m_pkthdr.len = clen + hlen + skip; 341 342 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 343 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 344 DPRINTF(("%s: m_pullup failed\n", __func__)); 345 error = EINVAL; /*XXX*/ 346 goto bad; 347 } 348 349 /* Keep the next protocol field */ 350 addr = (caddr_t) mtod(m, struct ip *) + skip; 351 nproto = ((struct ipcomp *) addr)->comp_nxt; 352 353 /* Remove the IPCOMP header */ 354 error = m_striphdr(m, skip, hlen); 355 if (error) { 356 IPCOMPSTAT_INC(ipcomps_hdrops); 357 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 358 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 359 (u_long) ntohl(sav->spi))); 360 goto bad; 361 } 362 363 /* Restore the Next Protocol field */ 364 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 365 366 switch (saidx->dst.sa.sa_family) { 367 #ifdef INET6 368 case AF_INET6: 369 error = ipsec6_common_input_cb(m, sav, skip, protoff); 370 break; 371 #endif 372 #ifdef INET 373 case AF_INET: 374 error = ipsec4_common_input_cb(m, sav, skip, protoff); 375 break; 376 #endif 377 default: 378 panic("%s: Unexpected address family: %d saidx=%p", __func__, 379 saidx->dst.sa.sa_family, saidx); 380 } 381 CURVNET_RESTORE(); 382 return error; 383 bad: 384 CURVNET_RESTORE(); 385 if (sav != NULL) 386 key_freesav(&sav); 387 if (m != NULL) 388 m_freem(m); 389 if (xd != NULL) 390 free(xd, M_IPCOMP); 391 if (crp != NULL) 392 crypto_freereq(crp); 393 return error; 394 } 395 396 /* 397 * IPComp output routine, called by ipsec[46]_perform_request() 398 */ 399 static int 400 ipcomp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav, 401 u_int idx, int skip, int protoff) 402 { 403 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 404 const struct comp_algo *ipcompx; 405 struct cryptop *crp; 406 struct xform_data *xd; 407 crypto_session_t cryptoid; 408 int error, ralen, maxpacketsize; 409 410 SECASVAR_RLOCK_TRACKER; 411 412 IPSEC_ASSERT(sav != NULL, ("null SA")); 413 ipcompx = sav->tdb_compalgxform; 414 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 415 416 /* 417 * Do not touch the packet in case our payload to compress 418 * is lower than the minimal threshold of the compression 419 * alogrithm. We will just send out the data uncompressed. 420 * See RFC 3173, 2.2. Non-Expansion Policy. 421 */ 422 if (m->m_pkthdr.len <= ipcompx->minlen) { 423 IPCOMPSTAT_INC(ipcomps_threshold); 424 return ipsec_process_done(m, sp, sav, idx); 425 } 426 427 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 428 IPCOMPSTAT_INC(ipcomps_output); 429 430 /* Check for maximum packet size violations. */ 431 switch (sav->sah->saidx.dst.sa.sa_family) { 432 #ifdef INET 433 case AF_INET: 434 maxpacketsize = IP_MAXPACKET; 435 break; 436 #endif /* INET */ 437 #ifdef INET6 438 case AF_INET6: 439 maxpacketsize = IPV6_MAXPACKET; 440 break; 441 #endif /* INET6 */ 442 default: 443 IPCOMPSTAT_INC(ipcomps_nopf); 444 DPRINTF(("%s: unknown/unsupported protocol family %d, " 445 "IPCA %s/%08lx\n", __func__, 446 sav->sah->saidx.dst.sa.sa_family, 447 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 448 (u_long) ntohl(sav->spi))); 449 error = EPFNOSUPPORT; 450 goto bad; 451 } 452 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 453 IPCOMPSTAT_INC(ipcomps_toobig); 454 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 455 "(len %u, max len %u)\n", __func__, 456 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 457 (u_long) ntohl(sav->spi), 458 ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 459 error = EMSGSIZE; 460 goto bad; 461 } 462 463 /* Update the counters */ 464 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip); 465 466 m = m_unshare(m, M_NOWAIT); 467 if (m == NULL) { 468 IPCOMPSTAT_INC(ipcomps_hdrops); 469 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 470 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 471 sizeof(buf)), (u_long) ntohl(sav->spi))); 472 error = ENOBUFS; 473 goto bad; 474 } 475 476 /* Ok now, we can pass to the crypto processing. */ 477 SECASVAR_RLOCK(sav); 478 cryptoid = sav->tdb_cryptoid; 479 SECASVAR_RUNLOCK(sav); 480 481 /* Get crypto descriptors */ 482 crp = crypto_getreq(cryptoid, M_NOWAIT); 483 if (crp == NULL) { 484 IPCOMPSTAT_INC(ipcomps_crypto); 485 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 486 error = ENOBUFS; 487 goto bad; 488 } 489 490 /* Compression descriptor */ 491 crp->crp_op = CRYPTO_OP_COMPRESS; 492 crp->crp_payload_start = skip; 493 crp->crp_payload_length = ralen; 494 495 /* IPsec-specific opaque crypto info */ 496 xd = malloc(sizeof(struct xform_data), M_IPCOMP, M_NOWAIT | M_ZERO); 497 if (xd == NULL) { 498 IPCOMPSTAT_INC(ipcomps_crypto); 499 DPRINTF(("%s: failed to allocate xform_data\n", __func__)); 500 crypto_freereq(crp); 501 error = ENOBUFS; 502 goto bad; 503 } 504 505 xd->sp = sp; 506 xd->sav = sav; 507 xd->idx = idx; 508 xd->skip = skip; 509 xd->protoff = protoff; 510 xd->vnet = curvnet; 511 xd->cryptoid = cryptoid; 512 513 /* Crypto operation descriptor */ 514 crp->crp_flags = CRYPTO_F_CBIFSYNC; 515 crypto_use_mbuf(crp, m); 516 crp->crp_callback = ipcomp_output_cb; 517 crp->crp_opaque = xd; 518 519 return crypto_dispatch(crp); 520 bad: 521 if (m) 522 m_freem(m); 523 key_freesav(&sav); 524 key_freesp(&sp); 525 return (error); 526 } 527 528 /* 529 * IPComp output callback from the crypto driver. 530 */ 531 static int 532 ipcomp_output_cb(struct cryptop *crp) 533 { 534 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 535 struct xform_data *xd; 536 struct secpolicy *sp; 537 struct secasvar *sav; 538 struct mbuf *m; 539 crypto_session_t cryptoid; 540 u_int idx; 541 int error, skip, protoff; 542 543 m = crp->crp_buf.cb_mbuf; 544 xd = crp->crp_opaque; 545 CURVNET_SET(xd->vnet); 546 idx = xd->idx; 547 sp = xd->sp; 548 sav = xd->sav; 549 skip = xd->skip; 550 protoff = xd->protoff; 551 cryptoid = xd->cryptoid; 552 553 /* Check for crypto errors */ 554 if (crp->crp_etype) { 555 if (crp->crp_etype == EAGAIN) { 556 /* Reset the session ID */ 557 if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0) 558 crypto_freesession(cryptoid); 559 xd->cryptoid = crp->crp_session; 560 CURVNET_RESTORE(); 561 return (crypto_dispatch(crp)); 562 } 563 IPCOMPSTAT_INC(ipcomps_noxform); 564 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 565 error = crp->crp_etype; 566 goto bad; 567 } 568 /* Shouldn't happen... */ 569 if (m == NULL) { 570 IPCOMPSTAT_INC(ipcomps_crypto); 571 DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 572 error = EINVAL; 573 goto bad; 574 } 575 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 576 577 if (crp->crp_payload_length > crp->crp_olen) { 578 struct mbuf *mo; 579 struct ipcomp *ipcomp; 580 int roff; 581 uint8_t prot; 582 583 /* Compression helped, inject IPCOMP header. */ 584 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 585 if (mo == NULL) { 586 IPCOMPSTAT_INC(ipcomps_wrap); 587 DPRINTF(("%s: IPCOMP header inject failed " 588 "for IPCA %s/%08lx\n", 589 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 590 sizeof(buf)), (u_long) ntohl(sav->spi))); 591 error = ENOBUFS; 592 goto bad; 593 } 594 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 595 596 /* Initialize the IPCOMP header */ 597 /* XXX alignment always correct? */ 598 switch (sav->sah->saidx.dst.sa.sa_family) { 599 #ifdef INET 600 case AF_INET: 601 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 602 break; 603 #endif /* INET */ 604 #ifdef INET6 605 case AF_INET6: 606 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 607 break; 608 #endif 609 } 610 ipcomp->comp_flags = 0; 611 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 612 613 /* Fix Next Protocol in IPv4/IPv6 header */ 614 prot = IPPROTO_IPCOMP; 615 m_copyback(m, protoff, sizeof(u_int8_t), 616 (u_char *)&prot); 617 618 /* Adjust the length in the IP header */ 619 switch (sav->sah->saidx.dst.sa.sa_family) { 620 #ifdef INET 621 case AF_INET: 622 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 623 break; 624 #endif /* INET */ 625 #ifdef INET6 626 case AF_INET6: 627 mtod(m, struct ip6_hdr *)->ip6_plen = 628 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 629 break; 630 #endif /* INET6 */ 631 default: 632 IPCOMPSTAT_INC(ipcomps_nopf); 633 DPRINTF(("%s: unknown/unsupported protocol " 634 "family %d, IPCA %s/%08lx\n", __func__, 635 sav->sah->saidx.dst.sa.sa_family, 636 ipsec_address(&sav->sah->saidx.dst, buf, 637 sizeof(buf)), (u_long) ntohl(sav->spi))); 638 error = EPFNOSUPPORT; 639 goto bad; 640 } 641 } else { 642 /* Compression was useless, we have lost time. */ 643 IPCOMPSTAT_INC(ipcomps_uncompr); 644 DPRINTF(("%s: compressions was useless %d <= %d\n", 645 __func__, crp->crp_payload_length, crp->crp_olen)); 646 /* XXX remember state to not compress the next couple 647 * of packets, RFC 3173, 2.2. Non-Expansion Policy */ 648 } 649 650 /* Release the crypto descriptor */ 651 free(xd, M_IPCOMP); 652 crypto_freereq(crp); 653 654 /* NB: m is reclaimed by ipsec_process_done. */ 655 error = ipsec_process_done(m, sp, sav, idx); 656 CURVNET_RESTORE(); 657 return (error); 658 bad: 659 if (m) 660 m_freem(m); 661 CURVNET_RESTORE(); 662 free(xd, M_IPCOMP); 663 crypto_freereq(crp); 664 key_freesav(&sav); 665 key_freesp(&sp); 666 return (error); 667 } 668 669 #ifdef INET 670 static int 671 ipcomp4_nonexp_encapcheck(const struct mbuf *m, int off, int proto, 672 void *arg __unused) 673 { 674 union sockaddr_union src, dst; 675 const struct ip *ip; 676 677 if (V_ipcomp_enable == 0) 678 return (0); 679 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6) 680 return (0); 681 bzero(&src, sizeof(src)); 682 bzero(&dst, sizeof(dst)); 683 src.sa.sa_family = dst.sa.sa_family = AF_INET; 684 src.sin.sin_len = dst.sin.sin_len = sizeof(struct sockaddr_in); 685 ip = mtod(m, const struct ip *); 686 src.sin.sin_addr = ip->ip_src; 687 dst.sin.sin_addr = ip->ip_dst; 688 return (ipcomp_encapcheck(&src, &dst)); 689 } 690 691 static const struct encaptab *ipe4_cookie = NULL; 692 static const struct encap_config ipv4_encap_cfg = { 693 .proto = -1, 694 .min_length = sizeof(struct ip), 695 .exact_match = sizeof(in_addr_t) << 4, 696 .check = ipcomp4_nonexp_encapcheck, 697 .input = ipcomp_nonexp_input 698 }; 699 #endif 700 #ifdef INET6 701 static int 702 ipcomp6_nonexp_encapcheck(const struct mbuf *m, int off, int proto, 703 void *arg __unused) 704 { 705 union sockaddr_union src, dst; 706 const struct ip6_hdr *ip6; 707 708 if (V_ipcomp_enable == 0) 709 return (0); 710 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6) 711 return (0); 712 bzero(&src, sizeof(src)); 713 bzero(&dst, sizeof(dst)); 714 src.sa.sa_family = dst.sa.sa_family = AF_INET; 715 src.sin6.sin6_len = dst.sin6.sin6_len = sizeof(struct sockaddr_in6); 716 ip6 = mtod(m, const struct ip6_hdr *); 717 src.sin6.sin6_addr = ip6->ip6_src; 718 dst.sin6.sin6_addr = ip6->ip6_dst; 719 if (IN6_IS_SCOPE_LINKLOCAL(&src.sin6.sin6_addr)) { 720 /* XXX: sa6_recoverscope() */ 721 src.sin6.sin6_scope_id = 722 ntohs(src.sin6.sin6_addr.s6_addr16[1]); 723 src.sin6.sin6_addr.s6_addr16[1] = 0; 724 } 725 if (IN6_IS_SCOPE_LINKLOCAL(&dst.sin6.sin6_addr)) { 726 /* XXX: sa6_recoverscope() */ 727 dst.sin6.sin6_scope_id = 728 ntohs(dst.sin6.sin6_addr.s6_addr16[1]); 729 dst.sin6.sin6_addr.s6_addr16[1] = 0; 730 } 731 return (ipcomp_encapcheck(&src, &dst)); 732 } 733 734 static const struct encaptab *ipe6_cookie = NULL; 735 static const struct encap_config ipv6_encap_cfg = { 736 .proto = -1, 737 .min_length = sizeof(struct ip6_hdr), 738 .exact_match = sizeof(struct in6_addr) << 4, 739 .check = ipcomp6_nonexp_encapcheck, 740 .input = ipcomp_nonexp_input 741 }; 742 #endif 743 744 static struct xformsw ipcomp_xformsw = { 745 .xf_type = XF_IPCOMP, 746 .xf_name = "IPcomp", 747 .xf_init = ipcomp_init, 748 .xf_cleanup = ipcomp_cleanup, 749 .xf_input = ipcomp_input, 750 .xf_output = ipcomp_output, 751 }; 752 753 static void 754 ipcomp_attach(void) 755 { 756 757 #ifdef INET 758 ipe4_cookie = ip_encap_attach(&ipv4_encap_cfg, NULL, M_WAITOK); 759 #endif 760 #ifdef INET6 761 ipe6_cookie = ip6_encap_attach(&ipv6_encap_cfg, NULL, M_WAITOK); 762 #endif 763 xform_attach(&ipcomp_xformsw); 764 } 765 766 static void 767 ipcomp_detach(void) 768 { 769 770 #ifdef INET 771 ip_encap_detach(ipe4_cookie); 772 #endif 773 #ifdef INET6 774 ip6_encap_detach(ipe6_cookie); 775 #endif 776 xform_detach(&ipcomp_xformsw); 777 } 778 779 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 780 ipcomp_attach, NULL); 781 SYSUNINIT(ipcomp_xform_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 782 ipcomp_detach, NULL); 783