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/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 int ipcomp_input_cb(struct cryptop *crp); 94 static int ipcomp_output_cb(struct cryptop *crp); 95 96 /* 97 * RFC 3173 p 2.2. Non-Expansion Policy: 98 * If the total size of a compressed payload and the IPComp header, as 99 * defined in section 3, is not smaller than the size of the original 100 * payload, the IP datagram MUST be sent in the original non-compressed 101 * form. 102 * 103 * When we use IPComp in tunnel mode, for small packets we will receive 104 * encapsulated IP-IP datagrams without any compression and without IPComp 105 * header. 106 */ 107 static int 108 ipcomp_encapcheck(union sockaddr_union *src, union sockaddr_union *dst) 109 { 110 struct secasvar *sav; 111 112 sav = key_allocsa_tunnel(src, dst, IPPROTO_IPCOMP); 113 if (sav == NULL) 114 return (0); 115 key_freesav(&sav); 116 117 if (src->sa.sa_family == AF_INET) 118 return (sizeof(struct in_addr) << 4); 119 else 120 return (sizeof(struct in6_addr) << 4); 121 } 122 123 static int 124 ipcomp_nonexp_input(struct mbuf *m, int off, int proto, void *arg __unused) 125 { 126 int isr; 127 128 NET_EPOCH_ASSERT(); 129 130 switch (proto) { 131 #ifdef INET 132 case IPPROTO_IPV4: 133 isr = NETISR_IP; 134 break; 135 #endif 136 #ifdef INET6 137 case IPPROTO_IPV6: 138 isr = NETISR_IPV6; 139 break; 140 #endif 141 default: 142 IPCOMPSTAT_INC(ipcomps_nopf); 143 m_freem(m); 144 return (IPPROTO_DONE); 145 } 146 m_adj(m, off); 147 IPCOMPSTAT_ADD(ipcomps_ibytes, m->m_pkthdr.len); 148 IPCOMPSTAT_INC(ipcomps_input); 149 netisr_dispatch(isr, m); 150 return (IPPROTO_DONE); 151 } 152 153 /* 154 * ipcomp_init() is called when an CPI is being set up. 155 */ 156 static int 157 ipcomp_init(struct secasvar *sav, struct xformsw *xsp) 158 { 159 const struct comp_algo *tcomp; 160 struct crypto_session_params csp; 161 162 /* NB: algorithm really comes in alg_enc and not alg_comp! */ 163 tcomp = comp_algorithm_lookup(sav->alg_enc); 164 if (tcomp == NULL) { 165 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__, 166 sav->alg_comp)); 167 return EINVAL; 168 } 169 sav->alg_comp = sav->alg_enc; /* set for doing histogram */ 170 sav->tdb_xform = xsp; 171 sav->tdb_compalgxform = tcomp; 172 173 /* Initialize crypto session */ 174 memset(&csp, 0, sizeof(csp)); 175 csp.csp_mode = CSP_MODE_COMPRESS; 176 csp.csp_cipher_alg = sav->tdb_compalgxform->type; 177 178 return crypto_newsession(&sav->tdb_cryptoid, &csp, V_crypto_support); 179 } 180 181 /* 182 * ipcomp_zeroize() used when IPCA is deleted 183 */ 184 static int 185 ipcomp_zeroize(struct secasvar *sav) 186 { 187 188 crypto_freesession(sav->tdb_cryptoid); 189 sav->tdb_cryptoid = NULL; 190 return 0; 191 } 192 193 /* 194 * ipcomp_input() gets called to uncompress an input packet 195 */ 196 static int 197 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 198 { 199 struct xform_data *xd; 200 struct cryptop *crp; 201 struct ipcomp *ipcomp; 202 crypto_session_t cryptoid; 203 caddr_t addr; 204 int error, hlen = IPCOMP_HLENGTH; 205 206 /* 207 * Check that the next header of the IPComp is not IPComp again, before 208 * doing any real work. Given it is not possible to do double 209 * compression it means someone is playing tricks on us. 210 */ 211 error = ENOBUFS; 212 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 213 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 214 DPRINTF(("%s: m_pullup failed\n", __func__)); 215 key_freesav(&sav); 216 return (error); 217 } 218 addr = (caddr_t) mtod(m, struct ip *) + skip; 219 ipcomp = (struct ipcomp *)addr; 220 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) { 221 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */ 222 DPRINTF(("%s: recursive compression detected\n", __func__)); 223 error = EINVAL; 224 goto bad; 225 } 226 227 SECASVAR_LOCK(sav); 228 cryptoid = sav->tdb_cryptoid; 229 SECASVAR_UNLOCK(sav); 230 231 /* Get crypto descriptors */ 232 crp = crypto_getreq(cryptoid, M_NOWAIT); 233 if (crp == NULL) { 234 DPRINTF(("%s: no crypto descriptors\n", __func__)); 235 IPCOMPSTAT_INC(ipcomps_crypto); 236 goto bad; 237 } 238 /* Get IPsec-specific opaque pointer */ 239 xd = malloc(sizeof(*xd), M_XDATA, M_NOWAIT | M_ZERO); 240 if (xd == NULL) { 241 DPRINTF(("%s: cannot allocate xform_data\n", __func__)); 242 IPCOMPSTAT_INC(ipcomps_crypto); 243 crypto_freereq(crp); 244 goto bad; 245 } 246 247 /* Decompression operation */ 248 crp->crp_op = CRYPTO_OP_DECOMPRESS; 249 crp->crp_payload_start = skip + hlen; 250 crp->crp_payload_length = m->m_pkthdr.len - (skip + hlen); 251 252 /* Crypto operation descriptor */ 253 crp->crp_flags = CRYPTO_F_CBIFSYNC; 254 crypto_use_mbuf(crp, m); 255 crp->crp_callback = ipcomp_input_cb; 256 crp->crp_opaque = xd; 257 258 /* These are passed as-is to the callback */ 259 xd->sav = sav; 260 xd->protoff = protoff; 261 xd->skip = skip; 262 xd->vnet = curvnet; 263 xd->cryptoid = cryptoid; 264 265 SECASVAR_LOCK(sav); 266 crp->crp_session = xd->cryptoid = sav->tdb_cryptoid; 267 SECASVAR_UNLOCK(sav); 268 269 return crypto_dispatch(crp); 270 bad: 271 m_freem(m); 272 key_freesav(&sav); 273 return (error); 274 } 275 276 /* 277 * IPComp input callback from the crypto driver. 278 */ 279 static int 280 ipcomp_input_cb(struct cryptop *crp) 281 { 282 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 283 struct xform_data *xd; 284 struct mbuf *m; 285 struct secasvar *sav; 286 struct secasindex *saidx; 287 caddr_t addr; 288 crypto_session_t cryptoid; 289 int hlen = IPCOMP_HLENGTH, error, clen; 290 int skip, protoff; 291 uint8_t nproto; 292 293 m = crp->crp_buf.cb_mbuf; 294 xd = crp->crp_opaque; 295 CURVNET_SET(xd->vnet); 296 sav = xd->sav; 297 skip = xd->skip; 298 protoff = xd->protoff; 299 cryptoid = xd->cryptoid; 300 saidx = &sav->sah->saidx; 301 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 302 saidx->dst.sa.sa_family == AF_INET6, 303 ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 304 305 /* Check for crypto errors */ 306 if (crp->crp_etype) { 307 if (crp->crp_etype == EAGAIN) { 308 /* Reset the session ID */ 309 if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0) 310 crypto_freesession(cryptoid); 311 xd->cryptoid = crp->crp_session; 312 CURVNET_RESTORE(); 313 return (crypto_dispatch(crp)); 314 } 315 IPCOMPSTAT_INC(ipcomps_noxform); 316 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 317 error = crp->crp_etype; 318 goto bad; 319 } 320 /* Shouldn't happen... */ 321 if (m == NULL) { 322 IPCOMPSTAT_INC(ipcomps_crypto); 323 DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 324 error = EINVAL; 325 goto bad; 326 } 327 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 328 329 clen = crp->crp_olen; /* Length of data after processing */ 330 331 /* Release the crypto descriptors */ 332 free(xd, M_XDATA), xd = NULL; 333 crypto_freereq(crp), crp = NULL; 334 335 /* In case it's not done already, adjust the size of the mbuf chain */ 336 m->m_pkthdr.len = clen + hlen + skip; 337 338 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 339 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 340 DPRINTF(("%s: m_pullup failed\n", __func__)); 341 error = EINVAL; /*XXX*/ 342 goto bad; 343 } 344 345 /* Keep the next protocol field */ 346 addr = (caddr_t) mtod(m, struct ip *) + skip; 347 nproto = ((struct ipcomp *) addr)->comp_nxt; 348 349 /* Remove the IPCOMP header */ 350 error = m_striphdr(m, skip, hlen); 351 if (error) { 352 IPCOMPSTAT_INC(ipcomps_hdrops); 353 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 354 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 355 (u_long) ntohl(sav->spi))); 356 goto bad; 357 } 358 359 /* Restore the Next Protocol field */ 360 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 361 362 switch (saidx->dst.sa.sa_family) { 363 #ifdef INET6 364 case AF_INET6: 365 error = ipsec6_common_input_cb(m, sav, skip, protoff); 366 break; 367 #endif 368 #ifdef INET 369 case AF_INET: 370 error = ipsec4_common_input_cb(m, sav, skip, protoff); 371 break; 372 #endif 373 default: 374 panic("%s: Unexpected address family: %d saidx=%p", __func__, 375 saidx->dst.sa.sa_family, saidx); 376 } 377 CURVNET_RESTORE(); 378 return error; 379 bad: 380 CURVNET_RESTORE(); 381 if (sav != NULL) 382 key_freesav(&sav); 383 if (m != NULL) 384 m_freem(m); 385 if (xd != NULL) 386 free(xd, M_XDATA); 387 if (crp != NULL) 388 crypto_freereq(crp); 389 return error; 390 } 391 392 /* 393 * IPComp output routine, called by ipsec[46]_perform_request() 394 */ 395 static int 396 ipcomp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav, 397 u_int idx, int skip, int protoff) 398 { 399 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 400 const struct comp_algo *ipcompx; 401 struct cryptop *crp; 402 struct xform_data *xd; 403 crypto_session_t cryptoid; 404 int error, ralen, maxpacketsize; 405 406 IPSEC_ASSERT(sav != NULL, ("null SA")); 407 ipcompx = sav->tdb_compalgxform; 408 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 409 410 /* 411 * Do not touch the packet in case our payload to compress 412 * is lower than the minimal threshold of the compression 413 * alogrithm. We will just send out the data uncompressed. 414 * See RFC 3173, 2.2. Non-Expansion Policy. 415 */ 416 if (m->m_pkthdr.len <= ipcompx->minlen) { 417 IPCOMPSTAT_INC(ipcomps_threshold); 418 return ipsec_process_done(m, sp, sav, idx); 419 } 420 421 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 422 IPCOMPSTAT_INC(ipcomps_output); 423 424 /* Check for maximum packet size violations. */ 425 switch (sav->sah->saidx.dst.sa.sa_family) { 426 #ifdef INET 427 case AF_INET: 428 maxpacketsize = IP_MAXPACKET; 429 break; 430 #endif /* INET */ 431 #ifdef INET6 432 case AF_INET6: 433 maxpacketsize = IPV6_MAXPACKET; 434 break; 435 #endif /* INET6 */ 436 default: 437 IPCOMPSTAT_INC(ipcomps_nopf); 438 DPRINTF(("%s: unknown/unsupported protocol family %d, " 439 "IPCA %s/%08lx\n", __func__, 440 sav->sah->saidx.dst.sa.sa_family, 441 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 442 (u_long) ntohl(sav->spi))); 443 error = EPFNOSUPPORT; 444 goto bad; 445 } 446 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 447 IPCOMPSTAT_INC(ipcomps_toobig); 448 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 449 "(len %u, max len %u)\n", __func__, 450 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 451 (u_long) ntohl(sav->spi), 452 ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 453 error = EMSGSIZE; 454 goto bad; 455 } 456 457 /* Update the counters */ 458 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip); 459 460 m = m_unshare(m, M_NOWAIT); 461 if (m == NULL) { 462 IPCOMPSTAT_INC(ipcomps_hdrops); 463 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 464 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 465 sizeof(buf)), (u_long) ntohl(sav->spi))); 466 error = ENOBUFS; 467 goto bad; 468 } 469 470 /* Ok now, we can pass to the crypto processing. */ 471 SECASVAR_LOCK(sav); 472 cryptoid = sav->tdb_cryptoid; 473 SECASVAR_UNLOCK(sav); 474 475 /* Get crypto descriptors */ 476 crp = crypto_getreq(cryptoid, M_NOWAIT); 477 if (crp == NULL) { 478 IPCOMPSTAT_INC(ipcomps_crypto); 479 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 480 error = ENOBUFS; 481 goto bad; 482 } 483 484 /* Compression descriptor */ 485 crp->crp_op = CRYPTO_OP_COMPRESS; 486 crp->crp_payload_start = skip; 487 crp->crp_payload_length = ralen; 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 xd->cryptoid = cryptoid; 506 507 /* Crypto operation descriptor */ 508 crp->crp_flags = CRYPTO_F_CBIFSYNC; 509 crypto_use_mbuf(crp, m); 510 crp->crp_callback = ipcomp_output_cb; 511 crp->crp_opaque = xd; 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 = crp->crp_buf.cb_mbuf; 538 xd = 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_payload_length > 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\n", 639 __func__, crp->crp_payload_length, 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