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 **mp, int *offp, int proto) 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(*mp); 139 return (IPPROTO_DONE); 140 } 141 m_adj(*mp, *offp); 142 IPCOMPSTAT_ADD(ipcomps_ibytes, (*mp)->m_pkthdr.len); 143 IPCOMPSTAT_INC(ipcomps_input); 144 netisr_dispatch(isr, *mp); 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 int err; 182 183 err = crypto_freesession(sav->tdb_cryptoid); 184 sav->tdb_cryptoid = 0; 185 return err; 186 } 187 188 /* 189 * ipcomp_input() gets called to uncompress an input packet 190 */ 191 static int 192 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 193 { 194 struct xform_data *xd; 195 struct cryptodesc *crdc; 196 struct cryptop *crp; 197 struct ipcomp *ipcomp; 198 caddr_t addr; 199 int error, hlen = IPCOMP_HLENGTH; 200 201 /* 202 * Check that the next header of the IPComp is not IPComp again, before 203 * doing any real work. Given it is not possible to do double 204 * compression it means someone is playing tricks on us. 205 */ 206 error = ENOBUFS; 207 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 208 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 209 DPRINTF(("%s: m_pullup failed\n", __func__)); 210 key_freesav(&sav); 211 return (error); 212 } 213 addr = (caddr_t) mtod(m, struct ip *) + skip; 214 ipcomp = (struct ipcomp *)addr; 215 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) { 216 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */ 217 DPRINTF(("%s: recursive compression detected\n", __func__)); 218 error = EINVAL; 219 goto bad; 220 } 221 222 /* Get crypto descriptors */ 223 crp = crypto_getreq(1); 224 if (crp == NULL) { 225 DPRINTF(("%s: no crypto descriptors\n", __func__)); 226 IPCOMPSTAT_INC(ipcomps_crypto); 227 goto bad; 228 } 229 /* Get IPsec-specific opaque pointer */ 230 xd = malloc(sizeof(*xd), M_XDATA, M_NOWAIT | M_ZERO); 231 if (xd == NULL) { 232 DPRINTF(("%s: cannot allocate xform_data\n", __func__)); 233 IPCOMPSTAT_INC(ipcomps_crypto); 234 crypto_freereq(crp); 235 goto bad; 236 } 237 crdc = crp->crp_desc; 238 239 crdc->crd_skip = skip + hlen; 240 crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 241 crdc->crd_inject = skip; 242 243 /* Decompression operation */ 244 crdc->crd_alg = sav->tdb_compalgxform->type; 245 246 247 /* Crypto operation descriptor */ 248 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 249 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 250 crp->crp_buf = (caddr_t) m; 251 crp->crp_callback = ipcomp_input_cb; 252 crp->crp_opaque = (caddr_t) xd; 253 254 /* These are passed as-is to the callback */ 255 xd->sav = sav; 256 xd->protoff = protoff; 257 xd->skip = skip; 258 259 SECASVAR_LOCK(sav); 260 crp->crp_sid = 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 uint64_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 sav = xd->sav; 290 skip = xd->skip; 291 protoff = xd->protoff; 292 cryptoid = xd->cryptoid; 293 saidx = &sav->sah->saidx; 294 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 295 saidx->dst.sa.sa_family == AF_INET6, 296 ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 297 298 /* Check for crypto errors */ 299 if (crp->crp_etype) { 300 if (crp->crp_etype == EAGAIN) { 301 /* Reset the session ID */ 302 if (ipsec_updateid(sav, &crp->crp_sid, &cryptoid) != 0) 303 crypto_freesession(cryptoid); 304 xd->cryptoid = crp->crp_sid; 305 return (crypto_dispatch(crp)); 306 } 307 IPCOMPSTAT_INC(ipcomps_noxform); 308 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 309 error = crp->crp_etype; 310 goto bad; 311 } 312 /* Shouldn't happen... */ 313 if (m == NULL) { 314 IPCOMPSTAT_INC(ipcomps_crypto); 315 DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 316 error = EINVAL; 317 goto bad; 318 } 319 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 320 321 clen = crp->crp_olen; /* Length of data after processing */ 322 323 /* Release the crypto descriptors */ 324 free(xd, M_XDATA), xd = NULL; 325 crypto_freereq(crp), crp = NULL; 326 327 /* In case it's not done already, adjust the size of the mbuf chain */ 328 m->m_pkthdr.len = clen + hlen + skip; 329 330 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 331 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 332 DPRINTF(("%s: m_pullup failed\n", __func__)); 333 error = EINVAL; /*XXX*/ 334 goto bad; 335 } 336 337 /* Keep the next protocol field */ 338 addr = (caddr_t) mtod(m, struct ip *) + skip; 339 nproto = ((struct ipcomp *) addr)->comp_nxt; 340 341 /* Remove the IPCOMP header */ 342 error = m_striphdr(m, skip, hlen); 343 if (error) { 344 IPCOMPSTAT_INC(ipcomps_hdrops); 345 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 346 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 347 (u_long) ntohl(sav->spi))); 348 goto bad; 349 } 350 351 /* Restore the Next Protocol field */ 352 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 353 354 switch (saidx->dst.sa.sa_family) { 355 #ifdef INET6 356 case AF_INET6: 357 error = ipsec6_common_input_cb(m, sav, skip, protoff); 358 break; 359 #endif 360 #ifdef INET 361 case AF_INET: 362 error = ipsec4_common_input_cb(m, sav, skip, protoff); 363 break; 364 #endif 365 default: 366 panic("%s: Unexpected address family: %d saidx=%p", __func__, 367 saidx->dst.sa.sa_family, saidx); 368 } 369 return error; 370 bad: 371 if (sav != NULL) 372 key_freesav(&sav); 373 if (m != NULL) 374 m_freem(m); 375 if (xd != NULL) 376 free(xd, M_XDATA); 377 if (crp != NULL) 378 crypto_freereq(crp); 379 return error; 380 } 381 382 /* 383 * IPComp output routine, called by ipsec[46]_perform_request() 384 */ 385 static int 386 ipcomp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav, 387 u_int idx, int skip, int protoff) 388 { 389 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 390 const struct comp_algo *ipcompx; 391 struct cryptodesc *crdc; 392 struct cryptop *crp; 393 struct xform_data *xd; 394 int error, ralen, maxpacketsize; 395 396 IPSEC_ASSERT(sav != NULL, ("null SA")); 397 ipcompx = sav->tdb_compalgxform; 398 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 399 400 /* 401 * Do not touch the packet in case our payload to compress 402 * is lower than the minimal threshold of the compression 403 * alogrithm. We will just send out the data uncompressed. 404 * See RFC 3173, 2.2. Non-Expansion Policy. 405 */ 406 if (m->m_pkthdr.len <= ipcompx->minlen) { 407 IPCOMPSTAT_INC(ipcomps_threshold); 408 return ipsec_process_done(m, sp, sav, idx); 409 } 410 411 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 412 IPCOMPSTAT_INC(ipcomps_output); 413 414 /* Check for maximum packet size violations. */ 415 switch (sav->sah->saidx.dst.sa.sa_family) { 416 #ifdef INET 417 case AF_INET: 418 maxpacketsize = IP_MAXPACKET; 419 break; 420 #endif /* INET */ 421 #ifdef INET6 422 case AF_INET6: 423 maxpacketsize = IPV6_MAXPACKET; 424 break; 425 #endif /* INET6 */ 426 default: 427 IPCOMPSTAT_INC(ipcomps_nopf); 428 DPRINTF(("%s: unknown/unsupported protocol family %d, " 429 "IPCA %s/%08lx\n", __func__, 430 sav->sah->saidx.dst.sa.sa_family, 431 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 432 (u_long) ntohl(sav->spi))); 433 error = EPFNOSUPPORT; 434 goto bad; 435 } 436 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 437 IPCOMPSTAT_INC(ipcomps_toobig); 438 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 439 "(len %u, max len %u)\n", __func__, 440 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 441 (u_long) ntohl(sav->spi), 442 ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 443 error = EMSGSIZE; 444 goto bad; 445 } 446 447 /* Update the counters */ 448 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip); 449 450 m = m_unshare(m, M_NOWAIT); 451 if (m == NULL) { 452 IPCOMPSTAT_INC(ipcomps_hdrops); 453 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 454 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 455 sizeof(buf)), (u_long) ntohl(sav->spi))); 456 error = ENOBUFS; 457 goto bad; 458 } 459 460 /* Ok now, we can pass to the crypto processing. */ 461 462 /* Get crypto descriptors */ 463 crp = crypto_getreq(1); 464 if (crp == NULL) { 465 IPCOMPSTAT_INC(ipcomps_crypto); 466 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 467 error = ENOBUFS; 468 goto bad; 469 } 470 crdc = crp->crp_desc; 471 472 /* Compression descriptor */ 473 crdc->crd_skip = skip; 474 crdc->crd_len = ralen; 475 crdc->crd_flags = CRD_F_COMP; 476 crdc->crd_inject = skip; 477 478 /* Compression operation */ 479 crdc->crd_alg = ipcompx->type; 480 481 /* IPsec-specific opaque crypto info */ 482 xd = malloc(sizeof(struct xform_data), M_XDATA, M_NOWAIT | M_ZERO); 483 if (xd == NULL) { 484 IPCOMPSTAT_INC(ipcomps_crypto); 485 DPRINTF(("%s: failed to allocate xform_data\n", __func__)); 486 crypto_freereq(crp); 487 error = ENOBUFS; 488 goto bad; 489 } 490 491 xd->sp = sp; 492 xd->sav = sav; 493 xd->idx = idx; 494 xd->skip = skip; 495 xd->protoff = protoff; 496 497 /* Crypto operation descriptor */ 498 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 499 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 500 crp->crp_buf = (caddr_t) m; 501 crp->crp_callback = ipcomp_output_cb; 502 crp->crp_opaque = (caddr_t) xd; 503 504 SECASVAR_LOCK(sav); 505 crp->crp_sid = xd->cryptoid = sav->tdb_cryptoid; 506 SECASVAR_UNLOCK(sav); 507 508 return crypto_dispatch(crp); 509 bad: 510 if (m) 511 m_freem(m); 512 key_freesav(&sav); 513 key_freesp(&sp); 514 return (error); 515 } 516 517 /* 518 * IPComp output callback from the crypto driver. 519 */ 520 static int 521 ipcomp_output_cb(struct cryptop *crp) 522 { 523 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 524 struct xform_data *xd; 525 struct secpolicy *sp; 526 struct secasvar *sav; 527 struct mbuf *m; 528 uint64_t cryptoid; 529 u_int idx; 530 int error, skip, protoff; 531 532 m = (struct mbuf *) crp->crp_buf; 533 xd = (struct xform_data *) crp->crp_opaque; 534 idx = xd->idx; 535 sp = xd->sp; 536 sav = xd->sav; 537 skip = xd->skip; 538 protoff = xd->protoff; 539 cryptoid = xd->cryptoid; 540 541 /* Check for crypto errors */ 542 if (crp->crp_etype) { 543 if (crp->crp_etype == EAGAIN) { 544 /* Reset the session ID */ 545 if (ipsec_updateid(sav, &crp->crp_sid, &cryptoid) != 0) 546 crypto_freesession(cryptoid); 547 xd->cryptoid = crp->crp_sid; 548 return (crypto_dispatch(crp)); 549 } 550 IPCOMPSTAT_INC(ipcomps_noxform); 551 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 552 error = crp->crp_etype; 553 goto bad; 554 } 555 /* Shouldn't happen... */ 556 if (m == NULL) { 557 IPCOMPSTAT_INC(ipcomps_crypto); 558 DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 559 error = EINVAL; 560 goto bad; 561 } 562 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 563 564 if (crp->crp_ilen - skip > crp->crp_olen) { 565 struct mbuf *mo; 566 struct ipcomp *ipcomp; 567 int roff; 568 uint8_t prot; 569 570 /* Compression helped, inject IPCOMP header. */ 571 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 572 if (mo == NULL) { 573 IPCOMPSTAT_INC(ipcomps_wrap); 574 DPRINTF(("%s: IPCOMP header inject failed " 575 "for IPCA %s/%08lx\n", 576 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 577 sizeof(buf)), (u_long) ntohl(sav->spi))); 578 error = ENOBUFS; 579 goto bad; 580 } 581 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 582 583 /* Initialize the IPCOMP header */ 584 /* XXX alignment always correct? */ 585 switch (sav->sah->saidx.dst.sa.sa_family) { 586 #ifdef INET 587 case AF_INET: 588 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 589 break; 590 #endif /* INET */ 591 #ifdef INET6 592 case AF_INET6: 593 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 594 break; 595 #endif 596 } 597 ipcomp->comp_flags = 0; 598 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 599 600 /* Fix Next Protocol in IPv4/IPv6 header */ 601 prot = IPPROTO_IPCOMP; 602 m_copyback(m, protoff, sizeof(u_int8_t), 603 (u_char *)&prot); 604 605 /* Adjust the length in the IP header */ 606 switch (sav->sah->saidx.dst.sa.sa_family) { 607 #ifdef INET 608 case AF_INET: 609 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 610 break; 611 #endif /* INET */ 612 #ifdef INET6 613 case AF_INET6: 614 mtod(m, struct ip6_hdr *)->ip6_plen = 615 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 616 break; 617 #endif /* INET6 */ 618 default: 619 IPCOMPSTAT_INC(ipcomps_nopf); 620 DPRINTF(("%s: unknown/unsupported protocol " 621 "family %d, IPCA %s/%08lx\n", __func__, 622 sav->sah->saidx.dst.sa.sa_family, 623 ipsec_address(&sav->sah->saidx.dst, buf, 624 sizeof(buf)), (u_long) ntohl(sav->spi))); 625 error = EPFNOSUPPORT; 626 goto bad; 627 } 628 } else { 629 /* Compression was useless, we have lost time. */ 630 IPCOMPSTAT_INC(ipcomps_uncompr); 631 DPRINTF(("%s: compressions was useless %d - %d <= %d\n", 632 __func__, crp->crp_ilen, skip, crp->crp_olen)); 633 /* XXX remember state to not compress the next couple 634 * of packets, RFC 3173, 2.2. Non-Expansion Policy */ 635 } 636 637 /* Release the crypto descriptor */ 638 free(xd, M_XDATA); 639 crypto_freereq(crp); 640 641 /* NB: m is reclaimed by ipsec_process_done. */ 642 error = ipsec_process_done(m, sp, sav, idx); 643 return (error); 644 bad: 645 if (m) 646 m_freem(m); 647 free(xd, M_XDATA); 648 crypto_freereq(crp); 649 key_freesav(&sav); 650 key_freesp(&sp); 651 return (error); 652 } 653 654 #ifdef INET 655 static const struct encaptab *ipe4_cookie = NULL; 656 extern struct domain inetdomain; 657 static struct protosw ipcomp4_protosw = { 658 .pr_type = SOCK_RAW, 659 .pr_domain = &inetdomain, 660 .pr_protocol = 0 /* IPPROTO_IPV[46] */, 661 .pr_flags = PR_ATOMIC | PR_ADDR | PR_LASTHDR, 662 .pr_input = ipcomp_nonexp_input, 663 .pr_output = rip_output, 664 .pr_ctloutput = rip_ctloutput, 665 .pr_usrreqs = &rip_usrreqs 666 }; 667 668 static int 669 ipcomp4_nonexp_encapcheck(const struct mbuf *m, int off, int proto, 670 void *arg __unused) 671 { 672 union sockaddr_union src, dst; 673 const struct ip *ip; 674 675 if (V_ipcomp_enable == 0) 676 return (0); 677 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6) 678 return (0); 679 bzero(&src, sizeof(src)); 680 bzero(&dst, sizeof(dst)); 681 src.sa.sa_family = dst.sa.sa_family = AF_INET; 682 src.sin.sin_len = dst.sin.sin_len = sizeof(struct sockaddr_in); 683 ip = mtod(m, const struct ip *); 684 src.sin.sin_addr = ip->ip_src; 685 dst.sin.sin_addr = ip->ip_dst; 686 return (ipcomp_encapcheck(&src, &dst)); 687 } 688 #endif 689 #ifdef INET6 690 static const struct encaptab *ipe6_cookie = NULL; 691 extern struct domain inet6domain; 692 static struct protosw ipcomp6_protosw = { 693 .pr_type = SOCK_RAW, 694 .pr_domain = &inet6domain, 695 .pr_protocol = 0 /* IPPROTO_IPV[46] */, 696 .pr_flags = PR_ATOMIC | PR_ADDR | PR_LASTHDR, 697 .pr_input = ipcomp_nonexp_input, 698 .pr_output = rip6_output, 699 .pr_ctloutput = rip6_ctloutput, 700 .pr_usrreqs = &rip6_usrreqs 701 }; 702 703 static int 704 ipcomp6_nonexp_encapcheck(const struct mbuf *m, int off, int proto, 705 void *arg __unused) 706 { 707 union sockaddr_union src, dst; 708 const struct ip6_hdr *ip6; 709 710 if (V_ipcomp_enable == 0) 711 return (0); 712 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6) 713 return (0); 714 bzero(&src, sizeof(src)); 715 bzero(&dst, sizeof(dst)); 716 src.sa.sa_family = dst.sa.sa_family = AF_INET; 717 src.sin6.sin6_len = dst.sin6.sin6_len = sizeof(struct sockaddr_in6); 718 ip6 = mtod(m, const struct ip6_hdr *); 719 src.sin6.sin6_addr = ip6->ip6_src; 720 dst.sin6.sin6_addr = ip6->ip6_dst; 721 if (IN6_IS_SCOPE_LINKLOCAL(&src.sin6.sin6_addr)) { 722 /* XXX: sa6_recoverscope() */ 723 src.sin6.sin6_scope_id = 724 ntohs(src.sin6.sin6_addr.s6_addr16[1]); 725 src.sin6.sin6_addr.s6_addr16[1] = 0; 726 } 727 if (IN6_IS_SCOPE_LINKLOCAL(&dst.sin6.sin6_addr)) { 728 /* XXX: sa6_recoverscope() */ 729 dst.sin6.sin6_scope_id = 730 ntohs(dst.sin6.sin6_addr.s6_addr16[1]); 731 dst.sin6.sin6_addr.s6_addr16[1] = 0; 732 } 733 return (ipcomp_encapcheck(&src, &dst)); 734 } 735 #endif 736 737 static struct xformsw ipcomp_xformsw = { 738 .xf_type = XF_IPCOMP, 739 .xf_name = "IPcomp", 740 .xf_init = ipcomp_init, 741 .xf_zeroize = ipcomp_zeroize, 742 .xf_input = ipcomp_input, 743 .xf_output = ipcomp_output, 744 }; 745 746 static void 747 ipcomp_attach(void) 748 { 749 750 #ifdef INET 751 ipe4_cookie = encap_attach_func(AF_INET, -1, 752 ipcomp4_nonexp_encapcheck, &ipcomp4_protosw, NULL); 753 #endif 754 #ifdef INET6 755 ipe6_cookie = encap_attach_func(AF_INET6, -1, 756 ipcomp6_nonexp_encapcheck, &ipcomp6_protosw, NULL); 757 #endif 758 xform_attach(&ipcomp_xformsw); 759 } 760 761 static void 762 ipcomp_detach(void) 763 { 764 765 #ifdef INET 766 encap_detach(ipe4_cookie); 767 #endif 768 #ifdef INET6 769 encap_detach(ipe6_cookie); 770 #endif 771 xform_detach(&ipcomp_xformsw); 772 } 773 774 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 775 ipcomp_attach, NULL); 776 SYSUNINIT(ipcomp_xform_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 777 ipcomp_detach, NULL); 778