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sys/netipsec/xform_ipcomp.c
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1 /* $FreeBSD: releng/11.1/sys/netipsec/xform_ipcomp.c 319599 2017-06-05 11:11:07Z ae $ */ 2 /* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */ 3 4 /*- 5 * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org) 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 /* IP payload compression protocol (IPComp), see RFC 2393 */ 32 #include "opt_inet.h" 33 #include "opt_inet6.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/mbuf.h> 38 #include <sys/lock.h> 39 #include <sys/mutex.h> 40 #include <sys/socket.h> 41 #include <sys/kernel.h> 42 #include <sys/protosw.h> 43 #include <sys/sysctl.h> 44 45 #include <netinet/in.h> 46 #include <netinet/in_systm.h> 47 #include <netinet/ip.h> 48 #include <netinet/ip_var.h> 49 #include <netinet/ip_encap.h> 50 51 #include <net/netisr.h> 52 #include <net/vnet.h> 53 54 #include <netipsec/ipsec.h> 55 #include <netipsec/xform.h> 56 57 #ifdef INET6 58 #include <netinet/ip6.h> 59 #include <netinet6/ip6_var.h> 60 #include <netipsec/ipsec6.h> 61 #endif 62 63 #include <netipsec/ipcomp.h> 64 #include <netipsec/ipcomp_var.h> 65 66 #include <netipsec/key.h> 67 #include <netipsec/key_debug.h> 68 69 #include <opencrypto/cryptodev.h> 70 #include <opencrypto/deflate.h> 71 #include <opencrypto/xform.h> 72 73 VNET_DEFINE(int, ipcomp_enable) = 1; 74 VNET_PCPUSTAT_DEFINE(struct ipcompstat, ipcompstat); 75 VNET_PCPUSTAT_SYSINIT(ipcompstat); 76 77 #ifdef VIMAGE 78 VNET_PCPUSTAT_SYSUNINIT(ipcompstat); 79 #endif /* VIMAGE */ 80 81 SYSCTL_DECL(_net_inet_ipcomp); 82 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, ipcomp_enable, 83 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, ""); 84 SYSCTL_VNET_PCPUSTAT(_net_inet_ipcomp, IPSECCTL_STATS, stats, 85 struct ipcompstat, ipcompstat, 86 "IPCOMP statistics (struct ipcompstat, netipsec/ipcomp_var.h"); 87 88 static int ipcomp_input_cb(struct cryptop *crp); 89 static int ipcomp_output_cb(struct cryptop *crp); 90 91 /* 92 * RFC 3173 p 2.2. Non-Expansion Policy: 93 * If the total size of a compressed payload and the IPComp header, as 94 * defined in section 3, is not smaller than the size of the original 95 * payload, the IP datagram MUST be sent in the original non-compressed 96 * form. 97 * 98 * When we use IPComp in tunnel mode, for small packets we will receive 99 * encapsulated IP-IP datagrams without any compression and without IPComp 100 * header. 101 */ 102 static int 103 ipcomp_encapcheck(union sockaddr_union *src, union sockaddr_union *dst) 104 { 105 struct secasvar *sav; 106 107 sav = key_allocsa_tunnel(src, dst, IPPROTO_IPCOMP); 108 if (sav == NULL) 109 return (0); 110 key_freesav(&sav); 111 112 if (src->sa.sa_family == AF_INET) 113 return (sizeof(struct in_addr) << 4); 114 else 115 return (sizeof(struct in6_addr) << 4); 116 } 117 118 static int 119 ipcomp_nonexp_input(struct mbuf **mp, int *offp, int proto) 120 { 121 int isr; 122 123 switch (proto) { 124 #ifdef INET 125 case IPPROTO_IPV4: 126 isr = NETISR_IP; 127 break; 128 #endif 129 #ifdef INET6 130 case IPPROTO_IPV6: 131 isr = NETISR_IPV6; 132 break; 133 #endif 134 default: 135 IPCOMPSTAT_INC(ipcomps_nopf); 136 m_freem(*mp); 137 return (IPPROTO_DONE); 138 } 139 m_adj(*mp, *offp); 140 IPCOMPSTAT_ADD(ipcomps_ibytes, (*mp)->m_pkthdr.len); 141 IPCOMPSTAT_INC(ipcomps_input); 142 netisr_dispatch(isr, *mp); 143 return (IPPROTO_DONE); 144 } 145 146 /* 147 * ipcomp_init() is called when an CPI is being set up. 148 */ 149 static int 150 ipcomp_init(struct secasvar *sav, struct xformsw *xsp) 151 { 152 const struct comp_algo *tcomp; 153 struct cryptoini cric; 154 155 /* NB: algorithm really comes in alg_enc and not alg_comp! */ 156 tcomp = comp_algorithm_lookup(sav->alg_enc); 157 if (tcomp == NULL) { 158 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__, 159 sav->alg_comp)); 160 return EINVAL; 161 } 162 sav->alg_comp = sav->alg_enc; /* set for doing histogram */ 163 sav->tdb_xform = xsp; 164 sav->tdb_compalgxform = tcomp; 165 166 /* Initialize crypto session */ 167 bzero(&cric, sizeof (cric)); 168 cric.cri_alg = sav->tdb_compalgxform->type; 169 170 return crypto_newsession(&sav->tdb_cryptoid, &cric, V_crypto_support); 171 } 172 173 /* 174 * ipcomp_zeroize() used when IPCA is deleted 175 */ 176 static int 177 ipcomp_zeroize(struct secasvar *sav) 178 { 179 int err; 180 181 err = crypto_freesession(sav->tdb_cryptoid); 182 sav->tdb_cryptoid = 0; 183 return err; 184 } 185 186 /* 187 * ipcomp_input() gets called to uncompress an input packet 188 */ 189 static int 190 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 191 { 192 struct xform_data *xd; 193 struct cryptodesc *crdc; 194 struct cryptop *crp; 195 struct ipcomp *ipcomp; 196 caddr_t addr; 197 int error, hlen = IPCOMP_HLENGTH; 198 199 /* 200 * Check that the next header of the IPComp is not IPComp again, before 201 * doing any real work. Given it is not possible to do double 202 * compression it means someone is playing tricks on us. 203 */ 204 error = ENOBUFS; 205 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 206 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 207 DPRINTF(("%s: m_pullup failed\n", __func__)); 208 key_freesav(&sav); 209 return (error); 210 } 211 addr = (caddr_t) mtod(m, struct ip *) + skip; 212 ipcomp = (struct ipcomp *)addr; 213 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) { 214 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */ 215 DPRINTF(("%s: recursive compression detected\n", __func__)); 216 error = EINVAL; 217 goto bad; 218 } 219 220 /* Get crypto descriptors */ 221 crp = crypto_getreq(1); 222 if (crp == NULL) { 223 DPRINTF(("%s: no crypto descriptors\n", __func__)); 224 IPCOMPSTAT_INC(ipcomps_crypto); 225 goto bad; 226 } 227 /* Get IPsec-specific opaque pointer */ 228 xd = malloc(sizeof(*xd), M_XDATA, M_NOWAIT | M_ZERO); 229 if (xd == NULL) { 230 DPRINTF(("%s: cannot allocate xform_data\n", __func__)); 231 IPCOMPSTAT_INC(ipcomps_crypto); 232 crypto_freereq(crp); 233 goto bad; 234 } 235 crdc = crp->crp_desc; 236 237 crdc->crd_skip = skip + hlen; 238 crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 239 crdc->crd_inject = skip; 240 241 /* Decompression operation */ 242 crdc->crd_alg = sav->tdb_compalgxform->type; 243 244 245 /* Crypto operation descriptor */ 246 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 247 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 248 crp->crp_buf = (caddr_t) m; 249 crp->crp_callback = ipcomp_input_cb; 250 crp->crp_opaque = (caddr_t) xd; 251 252 /* These are passed as-is to the callback */ 253 xd->sav = sav; 254 xd->protoff = protoff; 255 xd->skip = skip; 256 257 SECASVAR_LOCK(sav); 258 crp->crp_sid = xd->cryptoid = sav->tdb_cryptoid; 259 SECASVAR_UNLOCK(sav); 260 261 return crypto_dispatch(crp); 262 bad: 263 m_freem(m); 264 key_freesav(&sav); 265 return (error); 266 } 267 268 /* 269 * IPComp input callback from the crypto driver. 270 */ 271 static int 272 ipcomp_input_cb(struct cryptop *crp) 273 { 274 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 275 struct cryptodesc *crd; 276 struct xform_data *xd; 277 struct mbuf *m; 278 struct secasvar *sav; 279 struct secasindex *saidx; 280 caddr_t addr; 281 uint64_t cryptoid; 282 int hlen = IPCOMP_HLENGTH, error, clen; 283 int skip, protoff; 284 uint8_t nproto; 285 286 crd = crp->crp_desc; 287 288 m = (struct mbuf *) crp->crp_buf; 289 xd = (struct xform_data *) crp->crp_opaque; 290 sav = xd->sav; 291 skip = xd->skip; 292 protoff = xd->protoff; 293 cryptoid = xd->cryptoid; 294 saidx = &sav->sah->saidx; 295 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 296 saidx->dst.sa.sa_family == AF_INET6, 297 ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 298 299 /* Check for crypto errors */ 300 if (crp->crp_etype) { 301 if (crp->crp_etype == EAGAIN) { 302 /* Reset the session ID */ 303 if (ipsec_updateid(sav, &crp->crp_sid, &cryptoid) != 0) 304 crypto_freesession(cryptoid); 305 xd->cryptoid = crp->crp_sid; 306 return (crypto_dispatch(crp)); 307 } 308 IPCOMPSTAT_INC(ipcomps_noxform); 309 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 310 error = crp->crp_etype; 311 goto bad; 312 } 313 /* Shouldn't happen... */ 314 if (m == NULL) { 315 IPCOMPSTAT_INC(ipcomps_crypto); 316 DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 317 error = EINVAL; 318 goto bad; 319 } 320 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 321 322 clen = crp->crp_olen; /* Length of data after processing */ 323 324 /* Release the crypto descriptors */ 325 free(xd, M_XDATA), xd = NULL; 326 crypto_freereq(crp), crp = NULL; 327 328 /* In case it's not done already, adjust the size of the mbuf chain */ 329 m->m_pkthdr.len = clen + hlen + skip; 330 331 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 332 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 333 DPRINTF(("%s: m_pullup failed\n", __func__)); 334 error = EINVAL; /*XXX*/ 335 goto bad; 336 } 337 338 /* Keep the next protocol field */ 339 addr = (caddr_t) mtod(m, struct ip *) + skip; 340 nproto = ((struct ipcomp *) addr)->comp_nxt; 341 342 /* Remove the IPCOMP header */ 343 error = m_striphdr(m, skip, hlen); 344 if (error) { 345 IPCOMPSTAT_INC(ipcomps_hdrops); 346 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 347 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 348 (u_long) ntohl(sav->spi))); 349 goto bad; 350 } 351 352 /* Restore the Next Protocol field */ 353 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 354 355 switch (saidx->dst.sa.sa_family) { 356 #ifdef INET6 357 case AF_INET6: 358 error = ipsec6_common_input_cb(m, sav, skip, protoff); 359 break; 360 #endif 361 #ifdef INET 362 case AF_INET: 363 error = ipsec4_common_input_cb(m, sav, skip, protoff); 364 break; 365 #endif 366 default: 367 panic("%s: Unexpected address family: %d saidx=%p", __func__, 368 saidx->dst.sa.sa_family, saidx); 369 } 370 return error; 371 bad: 372 if (sav != NULL) 373 key_freesav(&sav); 374 if (m != NULL) 375 m_freem(m); 376 if (xd != NULL) 377 free(xd, M_XDATA); 378 if (crp != NULL) 379 crypto_freereq(crp); 380 return error; 381 } 382 383 /* 384 * IPComp output routine, called by ipsec[46]_perform_request() 385 */ 386 static int 387 ipcomp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav, 388 u_int idx, int skip, int protoff) 389 { 390 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 391 const struct comp_algo *ipcompx; 392 struct cryptodesc *crdc; 393 struct cryptop *crp; 394 struct xform_data *xd; 395 int error, ralen, maxpacketsize; 396 397 IPSEC_ASSERT(sav != NULL, ("null SA")); 398 ipcompx = sav->tdb_compalgxform; 399 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 400 401 /* 402 * Do not touch the packet in case our payload to compress 403 * is lower than the minimal threshold of the compression 404 * alogrithm. We will just send out the data uncompressed. 405 * See RFC 3173, 2.2. Non-Expansion Policy. 406 */ 407 if (m->m_pkthdr.len <= ipcompx->minlen) { 408 IPCOMPSTAT_INC(ipcomps_threshold); 409 return ipsec_process_done(m, sp, sav, idx); 410 } 411 412 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 413 IPCOMPSTAT_INC(ipcomps_output); 414 415 /* Check for maximum packet size violations. */ 416 switch (sav->sah->saidx.dst.sa.sa_family) { 417 #ifdef INET 418 case AF_INET: 419 maxpacketsize = IP_MAXPACKET; 420 break; 421 #endif /* INET */ 422 #ifdef INET6 423 case AF_INET6: 424 maxpacketsize = IPV6_MAXPACKET; 425 break; 426 #endif /* INET6 */ 427 default: 428 IPCOMPSTAT_INC(ipcomps_nopf); 429 DPRINTF(("%s: unknown/unsupported protocol family %d, " 430 "IPCA %s/%08lx\n", __func__, 431 sav->sah->saidx.dst.sa.sa_family, 432 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 433 (u_long) ntohl(sav->spi))); 434 error = EPFNOSUPPORT; 435 goto bad; 436 } 437 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 438 IPCOMPSTAT_INC(ipcomps_toobig); 439 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 440 "(len %u, max len %u)\n", __func__, 441 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 442 (u_long) ntohl(sav->spi), 443 ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 444 error = EMSGSIZE; 445 goto bad; 446 } 447 448 /* Update the counters */ 449 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip); 450 451 m = m_unshare(m, M_NOWAIT); 452 if (m == NULL) { 453 IPCOMPSTAT_INC(ipcomps_hdrops); 454 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 455 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 456 sizeof(buf)), (u_long) ntohl(sav->spi))); 457 error = ENOBUFS; 458 goto bad; 459 } 460 461 /* Ok now, we can pass to the crypto processing. */ 462 463 /* Get crypto descriptors */ 464 crp = crypto_getreq(1); 465 if (crp == NULL) { 466 IPCOMPSTAT_INC(ipcomps_crypto); 467 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 468 error = ENOBUFS; 469 goto bad; 470 } 471 crdc = crp->crp_desc; 472 473 /* Compression descriptor */ 474 crdc->crd_skip = skip; 475 crdc->crd_len = ralen; 476 crdc->crd_flags = CRD_F_COMP; 477 crdc->crd_inject = skip; 478 479 /* Compression operation */ 480 crdc->crd_alg = ipcompx->type; 481 482 /* IPsec-specific opaque crypto info */ 483 xd = malloc(sizeof(struct xform_data), M_XDATA, M_NOWAIT | M_ZERO); 484 if (xd == NULL) { 485 IPCOMPSTAT_INC(ipcomps_crypto); 486 DPRINTF(("%s: failed to allocate xform_data\n", __func__)); 487 crypto_freereq(crp); 488 error = ENOBUFS; 489 goto bad; 490 } 491 492 xd->sp = sp; 493 xd->sav = sav; 494 xd->idx = idx; 495 xd->skip = skip; 496 xd->protoff = protoff; 497 498 /* Crypto operation descriptor */ 499 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 500 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 501 crp->crp_buf = (caddr_t) m; 502 crp->crp_callback = ipcomp_output_cb; 503 crp->crp_opaque = (caddr_t) xd; 504 505 SECASVAR_LOCK(sav); 506 crp->crp_sid = xd->cryptoid = sav->tdb_cryptoid; 507 SECASVAR_UNLOCK(sav); 508 509 return crypto_dispatch(crp); 510 bad: 511 if (m) 512 m_freem(m); 513 key_freesav(&sav); 514 key_freesp(&sp); 515 return (error); 516 } 517 518 /* 519 * IPComp output callback from the crypto driver. 520 */ 521 static int 522 ipcomp_output_cb(struct cryptop *crp) 523 { 524 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 525 struct xform_data *xd; 526 struct secpolicy *sp; 527 struct secasvar *sav; 528 struct mbuf *m; 529 uint64_t cryptoid; 530 u_int idx; 531 int error, skip, protoff; 532 533 m = (struct mbuf *) crp->crp_buf; 534 xd = (struct xform_data *) crp->crp_opaque; 535 idx = xd->idx; 536 sp = xd->sp; 537 sav = xd->sav; 538 skip = xd->skip; 539 protoff = xd->protoff; 540 cryptoid = xd->cryptoid; 541 542 /* Check for crypto errors */ 543 if (crp->crp_etype) { 544 if (crp->crp_etype == EAGAIN) { 545 /* Reset the session ID */ 546 if (ipsec_updateid(sav, &crp->crp_sid, &cryptoid) != 0) 547 crypto_freesession(cryptoid); 548 xd->cryptoid = crp->crp_sid; 549 return (crypto_dispatch(crp)); 550 } 551 IPCOMPSTAT_INC(ipcomps_noxform); 552 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 553 error = crp->crp_etype; 554 goto bad; 555 } 556 /* Shouldn't happen... */ 557 if (m == NULL) { 558 IPCOMPSTAT_INC(ipcomps_crypto); 559 DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 560 error = EINVAL; 561 goto bad; 562 } 563 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 564 565 if (crp->crp_ilen - skip > crp->crp_olen) { 566 struct mbuf *mo; 567 struct ipcomp *ipcomp; 568 int roff; 569 uint8_t prot; 570 571 /* Compression helped, inject IPCOMP header. */ 572 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 573 if (mo == NULL) { 574 IPCOMPSTAT_INC(ipcomps_wrap); 575 DPRINTF(("%s: IPCOMP header inject failed " 576 "for IPCA %s/%08lx\n", 577 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 578 sizeof(buf)), (u_long) ntohl(sav->spi))); 579 error = ENOBUFS; 580 goto bad; 581 } 582 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 583 584 /* Initialize the IPCOMP header */ 585 /* XXX alignment always correct? */ 586 switch (sav->sah->saidx.dst.sa.sa_family) { 587 #ifdef INET 588 case AF_INET: 589 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 590 break; 591 #endif /* INET */ 592 #ifdef INET6 593 case AF_INET6: 594 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 595 break; 596 #endif 597 } 598 ipcomp->comp_flags = 0; 599 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 600 601 /* Fix Next Protocol in IPv4/IPv6 header */ 602 prot = IPPROTO_IPCOMP; 603 m_copyback(m, protoff, sizeof(u_int8_t), 604 (u_char *)&prot); 605 606 /* Adjust the length in the IP header */ 607 switch (sav->sah->saidx.dst.sa.sa_family) { 608 #ifdef INET 609 case AF_INET: 610 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 611 break; 612 #endif /* INET */ 613 #ifdef INET6 614 case AF_INET6: 615 mtod(m, struct ip6_hdr *)->ip6_plen = 616 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 617 break; 618 #endif /* INET6 */ 619 default: 620 IPCOMPSTAT_INC(ipcomps_nopf); 621 DPRINTF(("%s: unknown/unsupported protocol " 622 "family %d, IPCA %s/%08lx\n", __func__, 623 sav->sah->saidx.dst.sa.sa_family, 624 ipsec_address(&sav->sah->saidx.dst, buf, 625 sizeof(buf)), (u_long) ntohl(sav->spi))); 626 error = EPFNOSUPPORT; 627 goto bad; 628 } 629 } else { 630 /* Compression was useless, we have lost time. */ 631 IPCOMPSTAT_INC(ipcomps_uncompr); 632 DPRINTF(("%s: compressions was useless %d - %d <= %d\n", 633 __func__, crp->crp_ilen, skip, crp->crp_olen)); 634 /* XXX remember state to not compress the next couple 635 * of packets, RFC 3173, 2.2. Non-Expansion Policy */ 636 } 637 638 /* Release the crypto descriptor */ 639 free(xd, M_XDATA); 640 crypto_freereq(crp); 641 642 /* NB: m is reclaimed by ipsec_process_done. */ 643 error = ipsec_process_done(m, sp, sav, idx); 644 return (error); 645 bad: 646 if (m) 647 m_freem(m); 648 free(xd, M_XDATA); 649 crypto_freereq(crp); 650 key_freesav(&sav); 651 key_freesp(&sp); 652 return (error); 653 } 654 655 #ifdef INET 656 static const struct encaptab *ipe4_cookie = NULL; 657 extern struct domain inetdomain; 658 static struct protosw ipcomp4_protosw = { 659 .pr_type = SOCK_RAW, 660 .pr_domain = &inetdomain, 661 .pr_protocol = 0 /* IPPROTO_IPV[46] */, 662 .pr_flags = PR_ATOMIC | PR_ADDR | PR_LASTHDR, 663 .pr_input = ipcomp_nonexp_input, 664 .pr_output = rip_output, 665 .pr_ctloutput = rip_ctloutput, 666 .pr_usrreqs = &rip_usrreqs 667 }; 668 669 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 #endif 690 #ifdef INET6 691 static const struct encaptab *ipe6_cookie = NULL; 692 extern struct domain inet6domain; 693 static struct protosw ipcomp6_protosw = { 694 .pr_type = SOCK_RAW, 695 .pr_domain = &inet6domain, 696 .pr_protocol = 0 /* IPPROTO_IPV[46] */, 697 .pr_flags = PR_ATOMIC | PR_ADDR | PR_LASTHDR, 698 .pr_input = ipcomp_nonexp_input, 699 .pr_output = rip6_output, 700 .pr_ctloutput = rip6_ctloutput, 701 .pr_usrreqs = &rip6_usrreqs 702 }; 703 704 static int 705 ipcomp6_nonexp_encapcheck(const struct mbuf *m, int off, int proto, 706 void *arg __unused) 707 { 708 union sockaddr_union src, dst; 709 const struct ip6_hdr *ip6; 710 711 if (V_ipcomp_enable == 0) 712 return (0); 713 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6) 714 return (0); 715 bzero(&src, sizeof(src)); 716 bzero(&dst, sizeof(dst)); 717 src.sa.sa_family = dst.sa.sa_family = AF_INET; 718 src.sin6.sin6_len = dst.sin6.sin6_len = sizeof(struct sockaddr_in6); 719 ip6 = mtod(m, const struct ip6_hdr *); 720 src.sin6.sin6_addr = ip6->ip6_src; 721 dst.sin6.sin6_addr = ip6->ip6_dst; 722 if (IN6_IS_SCOPE_LINKLOCAL(&src.sin6.sin6_addr)) { 723 /* XXX: sa6_recoverscope() */ 724 src.sin6.sin6_scope_id = 725 ntohs(src.sin6.sin6_addr.s6_addr16[1]); 726 src.sin6.sin6_addr.s6_addr16[1] = 0; 727 } 728 if (IN6_IS_SCOPE_LINKLOCAL(&dst.sin6.sin6_addr)) { 729 /* XXX: sa6_recoverscope() */ 730 dst.sin6.sin6_scope_id = 731 ntohs(dst.sin6.sin6_addr.s6_addr16[1]); 732 dst.sin6.sin6_addr.s6_addr16[1] = 0; 733 } 734 return (ipcomp_encapcheck(&src, &dst)); 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 = encap_attach_func(AF_INET, -1, 753 ipcomp4_nonexp_encapcheck, &ipcomp4_protosw, NULL); 754 #endif 755 #ifdef INET6 756 ipe6_cookie = encap_attach_func(AF_INET6, -1, 757 ipcomp6_nonexp_encapcheck, &ipcomp6_protosw, NULL); 758 #endif 759 xform_attach(&ipcomp_xformsw); 760 } 761 762 static void 763 ipcomp_detach(void) 764 { 765 766 #ifdef INET 767 encap_detach(ipe4_cookie); 768 #endif 769 #ifdef INET6 770 encap_detach(ipe6_cookie); 771 #endif 772 xform_detach(&ipcomp_xformsw); 773 } 774 775 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 776 ipcomp_attach, NULL); 777 SYSUNINIT(ipcomp_xform_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 778 ipcomp_detach, NULL);
Cache object: 38ebd49760b68992a2443205238639be
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