xform_ipcomp.c revision 315514
1/* $FreeBSD: stable/11/sys/netipsec/xform_ipcomp.c 315514 2017-03-18 22:04:20Z 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 73VNET_DEFINE(int, ipcomp_enable) = 1; 74VNET_PCPUSTAT_DEFINE(struct ipcompstat, ipcompstat); 75VNET_PCPUSTAT_SYSINIT(ipcompstat); 76 77#ifdef VIMAGE 78VNET_PCPUSTAT_SYSUNINIT(ipcompstat); 79#endif /* VIMAGE */ 80 81SYSCTL_DECL(_net_inet_ipcomp); 82SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, ipcomp_enable, 83 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, ""); 84SYSCTL_VNET_PCPUSTAT(_net_inet_ipcomp, IPSECCTL_STATS, stats, 85 struct ipcompstat, ipcompstat, 86 "IPCOMP statistics (struct ipcompstat, netipsec/ipcomp_var.h"); 87 88static int ipcomp_input_cb(struct cryptop *crp); 89static 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 */ 102static int 103ipcomp_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 118static int 119ipcomp_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 */ 149static int 150ipcomp_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 */ 176static int 177ipcomp_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 */ 189static int 190ipcomp_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 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 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 205 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 206 DPRINTF(("%s: m_pullup failed\n", __func__)); 207 return (ENOBUFS); 208 } 209 addr = (caddr_t) mtod(m, struct ip *) + skip; 210 ipcomp = (struct ipcomp *)addr; 211 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) { 212 m_freem(m); 213 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */ 214 DPRINTF(("%s: recursive compression detected\n", __func__)); 215 return (EINVAL); 216 } 217 218 /* Get crypto descriptors */ 219 crp = crypto_getreq(1); 220 if (crp == NULL) { 221 m_freem(m); 222 DPRINTF(("%s: no crypto descriptors\n", __func__)); 223 IPCOMPSTAT_INC(ipcomps_crypto); 224 return ENOBUFS; 225 } 226 /* Get IPsec-specific opaque pointer */ 227 xd = malloc(sizeof(*xd), M_XDATA, M_NOWAIT | M_ZERO); 228 if (xd == NULL) { 229 DPRINTF(("%s: cannot allocate xform_data\n", __func__)); 230 IPCOMPSTAT_INC(ipcomps_crypto); 231 crypto_freereq(crp); 232 m_freem(m); 233 return ENOBUFS; 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} 263 264/* 265 * IPComp input callback from the crypto driver. 266 */ 267static int 268ipcomp_input_cb(struct cryptop *crp) 269{ 270 char buf[IPSEC_ADDRSTRLEN]; 271 struct cryptodesc *crd; 272 struct xform_data *xd; 273 struct mbuf *m; 274 struct secasvar *sav; 275 struct secasindex *saidx; 276 caddr_t addr; 277 uint64_t cryptoid; 278 int hlen = IPCOMP_HLENGTH, error, clen; 279 int skip, protoff; 280 uint8_t nproto; 281 282 crd = crp->crp_desc; 283 284 m = (struct mbuf *) crp->crp_buf; 285 xd = (struct xform_data *) crp->crp_opaque; 286 sav = xd->sav; 287 skip = xd->skip; 288 protoff = xd->protoff; 289 cryptoid = xd->cryptoid; 290 saidx = &sav->sah->saidx; 291 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 292 saidx->dst.sa.sa_family == AF_INET6, 293 ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 294 295 /* Check for crypto errors */ 296 if (crp->crp_etype) { 297 if (crp->crp_etype == EAGAIN) { 298 /* Reset the session ID */ 299 if (ipsec_updateid(sav, &crp->crp_sid, &cryptoid) != 0) 300 crypto_freesession(cryptoid); 301 xd->cryptoid = crp->crp_sid; 302 return (crypto_dispatch(crp)); 303 } 304 IPCOMPSTAT_INC(ipcomps_noxform); 305 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 306 error = crp->crp_etype; 307 goto bad; 308 } 309 /* Shouldn't happen... */ 310 if (m == NULL) { 311 IPCOMPSTAT_INC(ipcomps_crypto); 312 DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 313 error = EINVAL; 314 goto bad; 315 } 316 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 317 318 clen = crp->crp_olen; /* Length of data after processing */ 319 320 /* Release the crypto descriptors */ 321 free(xd, M_XDATA), xd = NULL; 322 crypto_freereq(crp), crp = NULL; 323 324 /* In case it's not done already, adjust the size of the mbuf chain */ 325 m->m_pkthdr.len = clen + hlen + skip; 326 327 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 328 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 329 DPRINTF(("%s: m_pullup failed\n", __func__)); 330 error = EINVAL; /*XXX*/ 331 goto bad; 332 } 333 334 /* Keep the next protocol field */ 335 addr = (caddr_t) mtod(m, struct ip *) + skip; 336 nproto = ((struct ipcomp *) addr)->comp_nxt; 337 338 /* Remove the IPCOMP header */ 339 error = m_striphdr(m, skip, hlen); 340 if (error) { 341 IPCOMPSTAT_INC(ipcomps_hdrops); 342 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 343 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 344 (u_long) ntohl(sav->spi))); 345 goto bad; 346 } 347 348 /* Restore the Next Protocol field */ 349 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 350 351 switch (saidx->dst.sa.sa_family) { 352#ifdef INET6 353 case AF_INET6: 354 error = ipsec6_common_input_cb(m, sav, skip, protoff); 355 break; 356#endif 357#ifdef INET 358 case AF_INET: 359 error = ipsec4_common_input_cb(m, sav, skip, protoff); 360 break; 361#endif 362 default: 363 panic("%s: Unexpected address family: %d saidx=%p", __func__, 364 saidx->dst.sa.sa_family, saidx); 365 } 366 return error; 367bad: 368 if (sav != NULL) 369 key_freesav(&sav); 370 if (m != NULL) 371 m_freem(m); 372 if (xd != NULL) 373 free(xd, M_XDATA); 374 if (crp != NULL) 375 crypto_freereq(crp); 376 return error; 377} 378 379/* 380 * IPComp output routine, called by ipsec[46]_perform_request() 381 */ 382static int 383ipcomp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav, 384 u_int idx, int skip, int protoff) 385{ 386 char buf[IPSEC_ADDRSTRLEN]; 387 const struct comp_algo *ipcompx; 388 struct cryptodesc *crdc; 389 struct cryptop *crp; 390 struct xform_data *xd; 391 int error, ralen, maxpacketsize; 392 393 IPSEC_ASSERT(sav != NULL, ("null SA")); 394 ipcompx = sav->tdb_compalgxform; 395 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 396 397 /* 398 * Do not touch the packet in case our payload to compress 399 * is lower than the minimal threshold of the compression 400 * alogrithm. We will just send out the data uncompressed. 401 * See RFC 3173, 2.2. Non-Expansion Policy. 402 */ 403 if (m->m_pkthdr.len <= ipcompx->minlen) { 404 IPCOMPSTAT_INC(ipcomps_threshold); 405 return ipsec_process_done(m, sp, sav, idx); 406 } 407 408 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 409 IPCOMPSTAT_INC(ipcomps_output); 410 411 /* Check for maximum packet size violations. */ 412 switch (sav->sah->saidx.dst.sa.sa_family) { 413#ifdef INET 414 case AF_INET: 415 maxpacketsize = IP_MAXPACKET; 416 break; 417#endif /* INET */ 418#ifdef INET6 419 case AF_INET6: 420 maxpacketsize = IPV6_MAXPACKET; 421 break; 422#endif /* INET6 */ 423 default: 424 IPCOMPSTAT_INC(ipcomps_nopf); 425 DPRINTF(("%s: unknown/unsupported protocol family %d, " 426 "IPCA %s/%08lx\n", __func__, 427 sav->sah->saidx.dst.sa.sa_family, 428 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 429 (u_long) ntohl(sav->spi))); 430 error = EPFNOSUPPORT; 431 goto bad; 432 } 433 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 434 IPCOMPSTAT_INC(ipcomps_toobig); 435 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 436 "(len %u, max len %u)\n", __func__, 437 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 438 (u_long) ntohl(sav->spi), 439 ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 440 error = EMSGSIZE; 441 goto bad; 442 } 443 444 /* Update the counters */ 445 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip); 446 447 m = m_unshare(m, M_NOWAIT); 448 if (m == NULL) { 449 IPCOMPSTAT_INC(ipcomps_hdrops); 450 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 451 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 452 sizeof(buf)), (u_long) ntohl(sav->spi))); 453 error = ENOBUFS; 454 goto bad; 455 } 456 457 /* Ok now, we can pass to the crypto processing. */ 458 459 /* Get crypto descriptors */ 460 crp = crypto_getreq(1); 461 if (crp == NULL) { 462 IPCOMPSTAT_INC(ipcomps_crypto); 463 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 464 error = ENOBUFS; 465 goto bad; 466 } 467 crdc = crp->crp_desc; 468 469 /* Compression descriptor */ 470 crdc->crd_skip = skip; 471 crdc->crd_len = ralen; 472 crdc->crd_flags = CRD_F_COMP; 473 crdc->crd_inject = skip; 474 475 /* Compression operation */ 476 crdc->crd_alg = ipcompx->type; 477 478 /* IPsec-specific opaque crypto info */ 479 xd = malloc(sizeof(struct xform_data), M_XDATA, M_NOWAIT | M_ZERO); 480 if (xd == NULL) { 481 IPCOMPSTAT_INC(ipcomps_crypto); 482 DPRINTF(("%s: failed to allocate xform_data\n", __func__)); 483 crypto_freereq(crp); 484 error = ENOBUFS; 485 goto bad; 486 } 487 488 xd->sp = sp; 489 xd->sav = sav; 490 xd->idx = idx; 491 xd->skip = skip; 492 xd->protoff = protoff; 493 494 /* Crypto operation descriptor */ 495 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 496 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 497 crp->crp_buf = (caddr_t) m; 498 crp->crp_callback = ipcomp_output_cb; 499 crp->crp_opaque = (caddr_t) xd; 500 501 SECASVAR_LOCK(sav); 502 crp->crp_sid = xd->cryptoid = sav->tdb_cryptoid; 503 SECASVAR_UNLOCK(sav); 504 505 return crypto_dispatch(crp); 506bad: 507 if (m) 508 m_freem(m); 509 return (error); 510} 511 512/* 513 * IPComp output callback from the crypto driver. 514 */ 515static int 516ipcomp_output_cb(struct cryptop *crp) 517{ 518 char buf[IPSEC_ADDRSTRLEN]; 519 struct xform_data *xd; 520 struct secpolicy *sp; 521 struct secasvar *sav; 522 struct mbuf *m; 523 uint64_t cryptoid; 524 u_int idx; 525 int error, skip, protoff; 526 527 m = (struct mbuf *) crp->crp_buf; 528 xd = (struct xform_data *) crp->crp_opaque; 529 idx = xd->idx; 530 sp = xd->sp; 531 sav = xd->sav; 532 skip = xd->skip; 533 protoff = xd->protoff; 534 cryptoid = xd->cryptoid; 535 536 /* Check for crypto errors */ 537 if (crp->crp_etype) { 538 if (crp->crp_etype == EAGAIN) { 539 /* Reset the session ID */ 540 if (ipsec_updateid(sav, &crp->crp_sid, &cryptoid) != 0) 541 crypto_freesession(cryptoid); 542 xd->cryptoid = crp->crp_sid; 543 return (crypto_dispatch(crp)); 544 } 545 IPCOMPSTAT_INC(ipcomps_noxform); 546 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 547 error = crp->crp_etype; 548 goto bad; 549 } 550 /* Shouldn't happen... */ 551 if (m == NULL) { 552 IPCOMPSTAT_INC(ipcomps_crypto); 553 DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 554 error = EINVAL; 555 goto bad; 556 } 557 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 558 559 if (crp->crp_ilen - skip > crp->crp_olen) { 560 struct mbuf *mo; 561 struct ipcomp *ipcomp; 562 int roff; 563 uint8_t prot; 564 565 /* Compression helped, inject IPCOMP header. */ 566 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 567 if (mo == NULL) { 568 IPCOMPSTAT_INC(ipcomps_wrap); 569 DPRINTF(("%s: IPCOMP header inject failed " 570 "for IPCA %s/%08lx\n", 571 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 572 sizeof(buf)), (u_long) ntohl(sav->spi))); 573 error = ENOBUFS; 574 goto bad; 575 } 576 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 577 578 /* Initialize the IPCOMP header */ 579 /* XXX alignment always correct? */ 580 switch (sav->sah->saidx.dst.sa.sa_family) { 581#ifdef INET 582 case AF_INET: 583 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 584 break; 585#endif /* INET */ 586#ifdef INET6 587 case AF_INET6: 588 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 589 break; 590#endif 591 } 592 ipcomp->comp_flags = 0; 593 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 594 595 /* Fix Next Protocol in IPv4/IPv6 header */ 596 prot = IPPROTO_IPCOMP; 597 m_copyback(m, protoff, sizeof(u_int8_t), 598 (u_char *)&prot); 599 600 /* Adjust the length in the IP header */ 601 switch (sav->sah->saidx.dst.sa.sa_family) { 602#ifdef INET 603 case AF_INET: 604 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 605 break; 606#endif /* INET */ 607#ifdef INET6 608 case AF_INET6: 609 mtod(m, struct ip6_hdr *)->ip6_plen = 610 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 611 break; 612#endif /* INET6 */ 613 default: 614 IPCOMPSTAT_INC(ipcomps_nopf); 615 DPRINTF(("%s: unknown/unsupported protocol " 616 "family %d, IPCA %s/%08lx\n", __func__, 617 sav->sah->saidx.dst.sa.sa_family, 618 ipsec_address(&sav->sah->saidx.dst, buf, 619 sizeof(buf)), (u_long) ntohl(sav->spi))); 620 error = EPFNOSUPPORT; 621 goto bad; 622 } 623 } else { 624 /* Compression was useless, we have lost time. */ 625 IPCOMPSTAT_INC(ipcomps_uncompr); 626 DPRINTF(("%s: compressions was useless %d - %d <= %d\n", 627 __func__, crp->crp_ilen, skip, crp->crp_olen)); 628 /* XXX remember state to not compress the next couple 629 * of packets, RFC 3173, 2.2. Non-Expansion Policy */ 630 } 631 632 /* Release the crypto descriptor */ 633 free(xd, M_XDATA); 634 crypto_freereq(crp); 635 636 /* NB: m is reclaimed by ipsec_process_done. */ 637 error = ipsec_process_done(m, sp, sav, idx); 638 return (error); 639bad: 640 if (m) 641 m_freem(m); 642 free(xd, M_XDATA); 643 crypto_freereq(crp); 644 key_freesav(&sav); 645 key_freesp(&sp); 646 return (error); 647} 648 649#ifdef INET 650static const struct encaptab *ipe4_cookie = NULL; 651extern struct domain inetdomain; 652static struct protosw ipcomp4_protosw = { 653 .pr_type = SOCK_RAW, 654 .pr_domain = &inetdomain, 655 .pr_protocol = 0 /* IPPROTO_IPV[46] */, 656 .pr_flags = PR_ATOMIC | PR_ADDR | PR_LASTHDR, 657 .pr_input = ipcomp_nonexp_input, 658 .pr_output = rip_output, 659 .pr_ctloutput = rip_ctloutput, 660 .pr_usrreqs = &rip_usrreqs 661}; 662 663static int 664ipcomp4_nonexp_encapcheck(const struct mbuf *m, int off, int proto, 665 void *arg __unused) 666{ 667 union sockaddr_union src, dst; 668 const struct ip *ip; 669 670 if (V_ipcomp_enable == 0) 671 return (0); 672 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6) 673 return (0); 674 bzero(&src, sizeof(src)); 675 bzero(&dst, sizeof(dst)); 676 src.sa.sa_family = dst.sa.sa_family = AF_INET; 677 src.sin.sin_len = dst.sin.sin_len = sizeof(struct sockaddr_in); 678 ip = mtod(m, const struct ip *); 679 src.sin.sin_addr = ip->ip_src; 680 dst.sin.sin_addr = ip->ip_dst; 681 return (ipcomp_encapcheck(&src, &dst)); 682} 683#endif 684#ifdef INET6 685static const struct encaptab *ipe6_cookie = NULL; 686extern struct domain inet6domain; 687static struct protosw ipcomp6_protosw = { 688 .pr_type = SOCK_RAW, 689 .pr_domain = &inet6domain, 690 .pr_protocol = 0 /* IPPROTO_IPV[46] */, 691 .pr_flags = PR_ATOMIC | PR_ADDR | PR_LASTHDR, 692 .pr_input = ipcomp_nonexp_input, 693 .pr_output = rip6_output, 694 .pr_ctloutput = rip6_ctloutput, 695 .pr_usrreqs = &rip6_usrreqs 696}; 697 698static int 699ipcomp6_nonexp_encapcheck(const struct mbuf *m, int off, int proto, 700 void *arg __unused) 701{ 702 union sockaddr_union src, dst; 703 const struct ip6_hdr *ip6; 704 705 if (V_ipcomp_enable == 0) 706 return (0); 707 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6) 708 return (0); 709 bzero(&src, sizeof(src)); 710 bzero(&dst, sizeof(dst)); 711 src.sa.sa_family = dst.sa.sa_family = AF_INET; 712 src.sin6.sin6_len = dst.sin6.sin6_len = sizeof(struct sockaddr_in6); 713 ip6 = mtod(m, const struct ip6_hdr *); 714 src.sin6.sin6_addr = ip6->ip6_src; 715 dst.sin6.sin6_addr = ip6->ip6_dst; 716 if (IN6_IS_SCOPE_LINKLOCAL(&src.sin6.sin6_addr)) { 717 /* XXX: sa6_recoverscope() */ 718 src.sin6.sin6_scope_id = 719 ntohs(src.sin6.sin6_addr.s6_addr16[1]); 720 src.sin6.sin6_addr.s6_addr16[1] = 0; 721 } 722 if (IN6_IS_SCOPE_LINKLOCAL(&dst.sin6.sin6_addr)) { 723 /* XXX: sa6_recoverscope() */ 724 dst.sin6.sin6_scope_id = 725 ntohs(dst.sin6.sin6_addr.s6_addr16[1]); 726 dst.sin6.sin6_addr.s6_addr16[1] = 0; 727 } 728 return (ipcomp_encapcheck(&src, &dst)); 729} 730#endif 731 732static struct xformsw ipcomp_xformsw = { 733 .xf_type = XF_IPCOMP, 734 .xf_name = "IPcomp", 735 .xf_init = ipcomp_init, 736 .xf_zeroize = ipcomp_zeroize, 737 .xf_input = ipcomp_input, 738 .xf_output = ipcomp_output, 739}; 740 741static void 742ipcomp_attach(void) 743{ 744 745#ifdef INET 746 ipe4_cookie = encap_attach_func(AF_INET, -1, 747 ipcomp4_nonexp_encapcheck, &ipcomp4_protosw, NULL); 748#endif 749#ifdef INET6 750 ipe6_cookie = encap_attach_func(AF_INET6, -1, 751 ipcomp6_nonexp_encapcheck, &ipcomp6_protosw, NULL); 752#endif 753 xform_attach(&ipcomp_xformsw); 754} 755 756static void 757ipcomp_detach(void) 758{ 759 760#ifdef INET 761 encap_detach(ipe4_cookie); 762#endif 763#ifdef INET6 764 encap_detach(ipe6_cookie); 765#endif 766 xform_detach(&ipcomp_xformsw); 767} 768 769SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 770 ipcomp_attach, NULL); 771SYSUNINIT(ipcomp_xform_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 772 ipcomp_detach, NULL); 773