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sys/netipsec/xform_ipcomp.c
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1 /* $FreeBSD: releng/11.2/sys/netipsec/xform_ipcomp.c 331693 2018-03-28 17:49:31Z jhb $ */ 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 xd->vnet = curvnet; 257 258 SECASVAR_LOCK(sav); 259 crp->crp_sid = xd->cryptoid = sav->tdb_cryptoid; 260 SECASVAR_UNLOCK(sav); 261 262 return crypto_dispatch(crp); 263 bad: 264 m_freem(m); 265 key_freesav(&sav); 266 return (error); 267 } 268 269 /* 270 * IPComp input callback from the crypto driver. 271 */ 272 static int 273 ipcomp_input_cb(struct cryptop *crp) 274 { 275 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 276 struct cryptodesc *crd; 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 crd = crp->crp_desc; 288 289 m = (struct mbuf *) crp->crp_buf; 290 xd = (struct xform_data *) crp->crp_opaque; 291 CURVNET_SET(xd->vnet); 292 sav = xd->sav; 293 skip = xd->skip; 294 protoff = xd->protoff; 295 cryptoid = xd->cryptoid; 296 saidx = &sav->sah->saidx; 297 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 298 saidx->dst.sa.sa_family == AF_INET6, 299 ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 300 301 /* Check for crypto errors */ 302 if (crp->crp_etype) { 303 if (crp->crp_etype == EAGAIN) { 304 /* Reset the session ID */ 305 if (ipsec_updateid(sav, &crp->crp_sid, &cryptoid) != 0) 306 crypto_freesession(cryptoid); 307 xd->cryptoid = crp->crp_sid; 308 CURVNET_RESTORE(); 309 return (crypto_dispatch(crp)); 310 } 311 IPCOMPSTAT_INC(ipcomps_noxform); 312 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 313 error = crp->crp_etype; 314 goto bad; 315 } 316 /* Shouldn't happen... */ 317 if (m == NULL) { 318 IPCOMPSTAT_INC(ipcomps_crypto); 319 DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 320 error = EINVAL; 321 goto bad; 322 } 323 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 324 325 clen = crp->crp_olen; /* Length of data after processing */ 326 327 /* Release the crypto descriptors */ 328 free(xd, M_XDATA), xd = NULL; 329 crypto_freereq(crp), crp = NULL; 330 331 /* In case it's not done already, adjust the size of the mbuf chain */ 332 m->m_pkthdr.len = clen + hlen + skip; 333 334 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 335 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 336 DPRINTF(("%s: m_pullup failed\n", __func__)); 337 error = EINVAL; /*XXX*/ 338 goto bad; 339 } 340 341 /* Keep the next protocol field */ 342 addr = (caddr_t) mtod(m, struct ip *) + skip; 343 nproto = ((struct ipcomp *) addr)->comp_nxt; 344 345 /* Remove the IPCOMP header */ 346 error = m_striphdr(m, skip, hlen); 347 if (error) { 348 IPCOMPSTAT_INC(ipcomps_hdrops); 349 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 350 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 351 (u_long) ntohl(sav->spi))); 352 goto bad; 353 } 354 355 /* Restore the Next Protocol field */ 356 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 357 358 switch (saidx->dst.sa.sa_family) { 359 #ifdef INET6 360 case AF_INET6: 361 error = ipsec6_common_input_cb(m, sav, skip, protoff); 362 break; 363 #endif 364 #ifdef INET 365 case AF_INET: 366 error = ipsec4_common_input_cb(m, sav, skip, protoff); 367 break; 368 #endif 369 default: 370 panic("%s: Unexpected address family: %d saidx=%p", __func__, 371 saidx->dst.sa.sa_family, saidx); 372 } 373 CURVNET_RESTORE(); 374 return error; 375 bad: 376 CURVNET_RESTORE(); 377 if (sav != NULL) 378 key_freesav(&sav); 379 if (m != NULL) 380 m_freem(m); 381 if (xd != NULL) 382 free(xd, M_XDATA); 383 if (crp != NULL) 384 crypto_freereq(crp); 385 return error; 386 } 387 388 /* 389 * IPComp output routine, called by ipsec[46]_perform_request() 390 */ 391 static int 392 ipcomp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav, 393 u_int idx, int skip, int protoff) 394 { 395 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 396 const struct comp_algo *ipcompx; 397 struct cryptodesc *crdc; 398 struct cryptop *crp; 399 struct xform_data *xd; 400 int error, ralen, maxpacketsize; 401 402 IPSEC_ASSERT(sav != NULL, ("null SA")); 403 ipcompx = sav->tdb_compalgxform; 404 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 405 406 /* 407 * Do not touch the packet in case our payload to compress 408 * is lower than the minimal threshold of the compression 409 * alogrithm. We will just send out the data uncompressed. 410 * See RFC 3173, 2.2. Non-Expansion Policy. 411 */ 412 if (m->m_pkthdr.len <= ipcompx->minlen) { 413 IPCOMPSTAT_INC(ipcomps_threshold); 414 return ipsec_process_done(m, sp, sav, idx); 415 } 416 417 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 418 IPCOMPSTAT_INC(ipcomps_output); 419 420 /* Check for maximum packet size violations. */ 421 switch (sav->sah->saidx.dst.sa.sa_family) { 422 #ifdef INET 423 case AF_INET: 424 maxpacketsize = IP_MAXPACKET; 425 break; 426 #endif /* INET */ 427 #ifdef INET6 428 case AF_INET6: 429 maxpacketsize = IPV6_MAXPACKET; 430 break; 431 #endif /* INET6 */ 432 default: 433 IPCOMPSTAT_INC(ipcomps_nopf); 434 DPRINTF(("%s: unknown/unsupported protocol family %d, " 435 "IPCA %s/%08lx\n", __func__, 436 sav->sah->saidx.dst.sa.sa_family, 437 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 438 (u_long) ntohl(sav->spi))); 439 error = EPFNOSUPPORT; 440 goto bad; 441 } 442 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 443 IPCOMPSTAT_INC(ipcomps_toobig); 444 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 445 "(len %u, max len %u)\n", __func__, 446 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 447 (u_long) ntohl(sav->spi), 448 ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 449 error = EMSGSIZE; 450 goto bad; 451 } 452 453 /* Update the counters */ 454 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip); 455 456 m = m_unshare(m, M_NOWAIT); 457 if (m == NULL) { 458 IPCOMPSTAT_INC(ipcomps_hdrops); 459 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 460 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 461 sizeof(buf)), (u_long) ntohl(sav->spi))); 462 error = ENOBUFS; 463 goto bad; 464 } 465 466 /* Ok now, we can pass to the crypto processing. */ 467 468 /* Get crypto descriptors */ 469 crp = crypto_getreq(1); 470 if (crp == NULL) { 471 IPCOMPSTAT_INC(ipcomps_crypto); 472 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 473 error = ENOBUFS; 474 goto bad; 475 } 476 crdc = crp->crp_desc; 477 478 /* Compression descriptor */ 479 crdc->crd_skip = skip; 480 crdc->crd_len = ralen; 481 crdc->crd_flags = CRD_F_COMP; 482 crdc->crd_inject = skip; 483 484 /* Compression operation */ 485 crdc->crd_alg = ipcompx->type; 486 487 /* IPsec-specific opaque crypto info */ 488 xd = malloc(sizeof(struct xform_data), M_XDATA, M_NOWAIT | M_ZERO); 489 if (xd == NULL) { 490 IPCOMPSTAT_INC(ipcomps_crypto); 491 DPRINTF(("%s: failed to allocate xform_data\n", __func__)); 492 crypto_freereq(crp); 493 error = ENOBUFS; 494 goto bad; 495 } 496 497 xd->sp = sp; 498 xd->sav = sav; 499 xd->idx = idx; 500 xd->skip = skip; 501 xd->protoff = protoff; 502 xd->vnet = curvnet; 503 504 /* Crypto operation descriptor */ 505 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 506 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 507 crp->crp_buf = (caddr_t) m; 508 crp->crp_callback = ipcomp_output_cb; 509 crp->crp_opaque = (caddr_t) xd; 510 511 SECASVAR_LOCK(sav); 512 crp->crp_sid = xd->cryptoid = sav->tdb_cryptoid; 513 SECASVAR_UNLOCK(sav); 514 515 return crypto_dispatch(crp); 516 bad: 517 if (m) 518 m_freem(m); 519 key_freesav(&sav); 520 key_freesp(&sp); 521 return (error); 522 } 523 524 /* 525 * IPComp output callback from the crypto driver. 526 */ 527 static int 528 ipcomp_output_cb(struct cryptop *crp) 529 { 530 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 531 struct xform_data *xd; 532 struct secpolicy *sp; 533 struct secasvar *sav; 534 struct mbuf *m; 535 uint64_t cryptoid; 536 u_int idx; 537 int error, skip, protoff; 538 539 m = (struct mbuf *) crp->crp_buf; 540 xd = (struct xform_data *) crp->crp_opaque; 541 CURVNET_SET(xd->vnet); 542 idx = xd->idx; 543 sp = xd->sp; 544 sav = xd->sav; 545 skip = xd->skip; 546 protoff = xd->protoff; 547 cryptoid = xd->cryptoid; 548 549 /* Check for crypto errors */ 550 if (crp->crp_etype) { 551 if (crp->crp_etype == EAGAIN) { 552 /* Reset the session ID */ 553 if (ipsec_updateid(sav, &crp->crp_sid, &cryptoid) != 0) 554 crypto_freesession(cryptoid); 555 xd->cryptoid = crp->crp_sid; 556 CURVNET_RESTORE(); 557 return (crypto_dispatch(crp)); 558 } 559 IPCOMPSTAT_INC(ipcomps_noxform); 560 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 561 error = crp->crp_etype; 562 goto bad; 563 } 564 /* Shouldn't happen... */ 565 if (m == NULL) { 566 IPCOMPSTAT_INC(ipcomps_crypto); 567 DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 568 error = EINVAL; 569 goto bad; 570 } 571 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 572 573 if (crp->crp_ilen - skip > crp->crp_olen) { 574 struct mbuf *mo; 575 struct ipcomp *ipcomp; 576 int roff; 577 uint8_t prot; 578 579 /* Compression helped, inject IPCOMP header. */ 580 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 581 if (mo == NULL) { 582 IPCOMPSTAT_INC(ipcomps_wrap); 583 DPRINTF(("%s: IPCOMP header inject failed " 584 "for IPCA %s/%08lx\n", 585 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 586 sizeof(buf)), (u_long) ntohl(sav->spi))); 587 error = ENOBUFS; 588 goto bad; 589 } 590 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 591 592 /* Initialize the IPCOMP header */ 593 /* XXX alignment always correct? */ 594 switch (sav->sah->saidx.dst.sa.sa_family) { 595 #ifdef INET 596 case AF_INET: 597 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 598 break; 599 #endif /* INET */ 600 #ifdef INET6 601 case AF_INET6: 602 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 603 break; 604 #endif 605 } 606 ipcomp->comp_flags = 0; 607 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 608 609 /* Fix Next Protocol in IPv4/IPv6 header */ 610 prot = IPPROTO_IPCOMP; 611 m_copyback(m, protoff, sizeof(u_int8_t), 612 (u_char *)&prot); 613 614 /* Adjust the length in the IP header */ 615 switch (sav->sah->saidx.dst.sa.sa_family) { 616 #ifdef INET 617 case AF_INET: 618 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 619 break; 620 #endif /* INET */ 621 #ifdef INET6 622 case AF_INET6: 623 mtod(m, struct ip6_hdr *)->ip6_plen = 624 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 625 break; 626 #endif /* INET6 */ 627 default: 628 IPCOMPSTAT_INC(ipcomps_nopf); 629 DPRINTF(("%s: unknown/unsupported protocol " 630 "family %d, IPCA %s/%08lx\n", __func__, 631 sav->sah->saidx.dst.sa.sa_family, 632 ipsec_address(&sav->sah->saidx.dst, buf, 633 sizeof(buf)), (u_long) ntohl(sav->spi))); 634 error = EPFNOSUPPORT; 635 goto bad; 636 } 637 } else { 638 /* Compression was useless, we have lost time. */ 639 IPCOMPSTAT_INC(ipcomps_uncompr); 640 DPRINTF(("%s: compressions was useless %d - %d <= %d\n", 641 __func__, crp->crp_ilen, skip, crp->crp_olen)); 642 /* XXX remember state to not compress the next couple 643 * of packets, RFC 3173, 2.2. Non-Expansion Policy */ 644 } 645 646 /* Release the crypto descriptor */ 647 free(xd, M_XDATA); 648 crypto_freereq(crp); 649 650 /* NB: m is reclaimed by ipsec_process_done. */ 651 error = ipsec_process_done(m, sp, sav, idx); 652 CURVNET_RESTORE(); 653 return (error); 654 bad: 655 if (m) 656 m_freem(m); 657 CURVNET_RESTORE(); 658 free(xd, M_XDATA); 659 crypto_freereq(crp); 660 key_freesav(&sav); 661 key_freesp(&sp); 662 return (error); 663 } 664 665 #ifdef INET 666 static const struct encaptab *ipe4_cookie = NULL; 667 extern struct domain inetdomain; 668 static struct protosw ipcomp4_protosw = { 669 .pr_type = SOCK_RAW, 670 .pr_domain = &inetdomain, 671 .pr_protocol = 0 /* IPPROTO_IPV[46] */, 672 .pr_flags = PR_ATOMIC | PR_ADDR | PR_LASTHDR, 673 .pr_input = ipcomp_nonexp_input, 674 .pr_output = rip_output, 675 .pr_ctloutput = rip_ctloutput, 676 .pr_usrreqs = &rip_usrreqs 677 }; 678 679 static int 680 ipcomp4_nonexp_encapcheck(const struct mbuf *m, int off, int proto, 681 void *arg __unused) 682 { 683 union sockaddr_union src, dst; 684 const struct ip *ip; 685 686 if (V_ipcomp_enable == 0) 687 return (0); 688 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6) 689 return (0); 690 bzero(&src, sizeof(src)); 691 bzero(&dst, sizeof(dst)); 692 src.sa.sa_family = dst.sa.sa_family = AF_INET; 693 src.sin.sin_len = dst.sin.sin_len = sizeof(struct sockaddr_in); 694 ip = mtod(m, const struct ip *); 695 src.sin.sin_addr = ip->ip_src; 696 dst.sin.sin_addr = ip->ip_dst; 697 return (ipcomp_encapcheck(&src, &dst)); 698 } 699 #endif 700 #ifdef INET6 701 static const struct encaptab *ipe6_cookie = NULL; 702 extern struct domain inet6domain; 703 static struct protosw ipcomp6_protosw = { 704 .pr_type = SOCK_RAW, 705 .pr_domain = &inet6domain, 706 .pr_protocol = 0 /* IPPROTO_IPV[46] */, 707 .pr_flags = PR_ATOMIC | PR_ADDR | PR_LASTHDR, 708 .pr_input = ipcomp_nonexp_input, 709 .pr_output = rip6_output, 710 .pr_ctloutput = rip6_ctloutput, 711 .pr_usrreqs = &rip6_usrreqs 712 }; 713 714 static int 715 ipcomp6_nonexp_encapcheck(const struct mbuf *m, int off, int proto, 716 void *arg __unused) 717 { 718 union sockaddr_union src, dst; 719 const struct ip6_hdr *ip6; 720 721 if (V_ipcomp_enable == 0) 722 return (0); 723 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6) 724 return (0); 725 bzero(&src, sizeof(src)); 726 bzero(&dst, sizeof(dst)); 727 src.sa.sa_family = dst.sa.sa_family = AF_INET; 728 src.sin6.sin6_len = dst.sin6.sin6_len = sizeof(struct sockaddr_in6); 729 ip6 = mtod(m, const struct ip6_hdr *); 730 src.sin6.sin6_addr = ip6->ip6_src; 731 dst.sin6.sin6_addr = ip6->ip6_dst; 732 if (IN6_IS_SCOPE_LINKLOCAL(&src.sin6.sin6_addr)) { 733 /* XXX: sa6_recoverscope() */ 734 src.sin6.sin6_scope_id = 735 ntohs(src.sin6.sin6_addr.s6_addr16[1]); 736 src.sin6.sin6_addr.s6_addr16[1] = 0; 737 } 738 if (IN6_IS_SCOPE_LINKLOCAL(&dst.sin6.sin6_addr)) { 739 /* XXX: sa6_recoverscope() */ 740 dst.sin6.sin6_scope_id = 741 ntohs(dst.sin6.sin6_addr.s6_addr16[1]); 742 dst.sin6.sin6_addr.s6_addr16[1] = 0; 743 } 744 return (ipcomp_encapcheck(&src, &dst)); 745 } 746 #endif 747 748 static struct xformsw ipcomp_xformsw = { 749 .xf_type = XF_IPCOMP, 750 .xf_name = "IPcomp", 751 .xf_init = ipcomp_init, 752 .xf_zeroize = ipcomp_zeroize, 753 .xf_input = ipcomp_input, 754 .xf_output = ipcomp_output, 755 }; 756 757 static void 758 ipcomp_attach(void) 759 { 760 761 #ifdef INET 762 ipe4_cookie = encap_attach_func(AF_INET, -1, 763 ipcomp4_nonexp_encapcheck, &ipcomp4_protosw, NULL); 764 #endif 765 #ifdef INET6 766 ipe6_cookie = encap_attach_func(AF_INET6, -1, 767 ipcomp6_nonexp_encapcheck, &ipcomp6_protosw, NULL); 768 #endif 769 xform_attach(&ipcomp_xformsw); 770 } 771 772 static void 773 ipcomp_detach(void) 774 { 775 776 #ifdef INET 777 encap_detach(ipe4_cookie); 778 #endif 779 #ifdef INET6 780 encap_detach(ipe6_cookie); 781 #endif 782 xform_detach(&ipcomp_xformsw); 783 } 784 785 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 786 ipcomp_attach, NULL); 787 SYSUNINIT(ipcomp_xform_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 788 ipcomp_detach, NULL);
Cache object: fb8104f1e5aa974daa6ba44cfb1d3420
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