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sys/netipsec/xform_ipcomp.c
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1 /* $FreeBSD$ */ 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 #include "opt_ipsec.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/mbuf.h> 39 #include <sys/lock.h> 40 #include <sys/mutex.h> 41 #include <sys/socket.h> 42 #include <sys/kernel.h> 43 #include <sys/protosw.h> 44 #include <sys/sysctl.h> 45 46 #include <netinet/in.h> 47 #include <netinet/in_systm.h> 48 #include <netinet/ip.h> 49 #include <netinet/ip_var.h> 50 #include <netinet/ip_encap.h> 51 52 #include <net/netisr.h> 53 #include <net/vnet.h> 54 55 #include <netipsec/ipsec.h> 56 #include <netipsec/xform.h> 57 58 #ifdef INET6 59 #include <netinet/ip6.h> 60 #include <netinet6/ip6_var.h> 61 #include <netipsec/ipsec6.h> 62 #endif 63 64 #include <netipsec/ipcomp.h> 65 #include <netipsec/ipcomp_var.h> 66 67 #include <netipsec/key.h> 68 #include <netipsec/key_debug.h> 69 70 #include <opencrypto/cryptodev.h> 71 #include <opencrypto/deflate.h> 72 #include <opencrypto/xform.h> 73 74 VNET_DEFINE(int, ipcomp_enable) = 1; 75 VNET_PCPUSTAT_DEFINE(struct ipcompstat, ipcompstat); 76 VNET_PCPUSTAT_SYSINIT(ipcompstat); 77 78 #ifdef VIMAGE 79 VNET_PCPUSTAT_SYSUNINIT(ipcompstat); 80 #endif /* VIMAGE */ 81 82 SYSCTL_DECL(_net_inet_ipcomp); 83 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, ipcomp_enable, 84 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, ""); 85 SYSCTL_VNET_PCPUSTAT(_net_inet_ipcomp, IPSECCTL_STATS, stats, 86 struct ipcompstat, ipcompstat, 87 "IPCOMP statistics (struct ipcompstat, netipsec/ipcomp_var.h"); 88 89 static int ipcomp_input_cb(struct cryptop *crp); 90 static int ipcomp_output_cb(struct cryptop *crp); 91 92 /* 93 * RFC 3173 p 2.2. Non-Expansion Policy: 94 * If the total size of a compressed payload and the IPComp header, as 95 * defined in section 3, is not smaller than the size of the original 96 * payload, the IP datagram MUST be sent in the original non-compressed 97 * form. 98 * 99 * When we use IPComp in tunnel mode, for small packets we will receive 100 * encapsulated IP-IP datagrams without any compression and without IPComp 101 * header. 102 */ 103 static int 104 ipcomp_encapcheck(union sockaddr_union *src, union sockaddr_union *dst) 105 { 106 struct secasvar *sav; 107 108 sav = key_allocsa_tunnel(src, dst, IPPROTO_IPCOMP); 109 if (sav == NULL) 110 return (0); 111 key_freesav(&sav); 112 113 if (src->sa.sa_family == AF_INET) 114 return (sizeof(struct in_addr) << 4); 115 else 116 return (sizeof(struct in6_addr) << 4); 117 } 118 119 static int 120 ipcomp_nonexp_input(struct mbuf **mp, int *offp, int proto) 121 { 122 int isr; 123 124 switch (proto) { 125 #ifdef INET 126 case IPPROTO_IPV4: 127 isr = NETISR_IP; 128 break; 129 #endif 130 #ifdef INET6 131 case IPPROTO_IPV6: 132 isr = NETISR_IPV6; 133 break; 134 #endif 135 default: 136 IPCOMPSTAT_INC(ipcomps_nopf); 137 m_freem(*mp); 138 return (IPPROTO_DONE); 139 } 140 m_adj(*mp, *offp); 141 IPCOMPSTAT_ADD(ipcomps_ibytes, (*mp)->m_pkthdr.len); 142 IPCOMPSTAT_INC(ipcomps_input); 143 netisr_dispatch(isr, *mp); 144 return (IPPROTO_DONE); 145 } 146 147 /* 148 * ipcomp_init() is called when an CPI is being set up. 149 */ 150 static int 151 ipcomp_init(struct secasvar *sav, struct xformsw *xsp) 152 { 153 const struct comp_algo *tcomp; 154 struct cryptoini cric; 155 156 /* NB: algorithm really comes in alg_enc and not alg_comp! */ 157 tcomp = comp_algorithm_lookup(sav->alg_enc); 158 if (tcomp == NULL) { 159 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__, 160 sav->alg_comp)); 161 return EINVAL; 162 } 163 sav->alg_comp = sav->alg_enc; /* set for doing histogram */ 164 sav->tdb_xform = xsp; 165 sav->tdb_compalgxform = tcomp; 166 167 /* Initialize crypto session */ 168 bzero(&cric, sizeof (cric)); 169 cric.cri_alg = sav->tdb_compalgxform->type; 170 171 return crypto_newsession(&sav->tdb_cryptoid, &cric, V_crypto_support); 172 } 173 174 /* 175 * ipcomp_zeroize() used when IPCA is deleted 176 */ 177 static int 178 ipcomp_zeroize(struct secasvar *sav) 179 { 180 int err; 181 182 err = crypto_freesession(sav->tdb_cryptoid); 183 sav->tdb_cryptoid = 0; 184 return err; 185 } 186 187 /* 188 * ipcomp_input() gets called to uncompress an input packet 189 */ 190 static int 191 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 192 { 193 struct xform_data *xd; 194 struct cryptodesc *crdc; 195 struct cryptop *crp; 196 struct ipcomp *ipcomp; 197 caddr_t addr; 198 int error, hlen = IPCOMP_HLENGTH; 199 200 /* 201 * Check that the next header of the IPComp is not IPComp again, before 202 * doing any real work. Given it is not possible to do double 203 * compression it means someone is playing tricks on us. 204 */ 205 error = ENOBUFS; 206 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 207 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 208 DPRINTF(("%s: m_pullup failed\n", __func__)); 209 key_freesav(&sav); 210 return (error); 211 } 212 addr = (caddr_t) mtod(m, struct ip *) + skip; 213 ipcomp = (struct ipcomp *)addr; 214 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) { 215 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */ 216 DPRINTF(("%s: recursive compression detected\n", __func__)); 217 error = EINVAL; 218 goto bad; 219 } 220 221 /* Get crypto descriptors */ 222 crp = crypto_getreq(1); 223 if (crp == NULL) { 224 DPRINTF(("%s: no crypto descriptors\n", __func__)); 225 IPCOMPSTAT_INC(ipcomps_crypto); 226 goto bad; 227 } 228 /* Get IPsec-specific opaque pointer */ 229 xd = malloc(sizeof(*xd), M_XDATA, M_NOWAIT | M_ZERO); 230 if (xd == NULL) { 231 DPRINTF(("%s: cannot allocate xform_data\n", __func__)); 232 IPCOMPSTAT_INC(ipcomps_crypto); 233 crypto_freereq(crp); 234 goto bad; 235 } 236 crdc = crp->crp_desc; 237 238 crdc->crd_skip = skip + hlen; 239 crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 240 crdc->crd_inject = skip; 241 242 /* Decompression operation */ 243 crdc->crd_alg = sav->tdb_compalgxform->type; 244 245 246 /* Crypto operation descriptor */ 247 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 248 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 249 crp->crp_buf = (caddr_t) m; 250 crp->crp_callback = ipcomp_input_cb; 251 crp->crp_opaque = (caddr_t) xd; 252 253 /* These are passed as-is to the callback */ 254 xd->sav = sav; 255 xd->protoff = protoff; 256 xd->skip = skip; 257 xd->vnet = curvnet; 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 cryptodesc *crd; 278 struct xform_data *xd; 279 struct mbuf *m; 280 struct secasvar *sav; 281 struct secasindex *saidx; 282 caddr_t addr; 283 uint64_t cryptoid; 284 int hlen = IPCOMP_HLENGTH, error, clen; 285 int skip, protoff; 286 uint8_t nproto; 287 288 crd = crp->crp_desc; 289 290 m = (struct mbuf *) crp->crp_buf; 291 xd = (struct xform_data *) crp->crp_opaque; 292 CURVNET_SET(xd->vnet); 293 sav = xd->sav; 294 skip = xd->skip; 295 protoff = xd->protoff; 296 cryptoid = xd->cryptoid; 297 saidx = &sav->sah->saidx; 298 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 299 saidx->dst.sa.sa_family == AF_INET6, 300 ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 301 302 /* Check for crypto errors */ 303 if (crp->crp_etype) { 304 if (crp->crp_etype == EAGAIN) { 305 /* Reset the session ID */ 306 if (ipsec_updateid(sav, &crp->crp_sid, &cryptoid) != 0) 307 crypto_freesession(cryptoid); 308 xd->cryptoid = crp->crp_sid; 309 CURVNET_RESTORE(); 310 return (crypto_dispatch(crp)); 311 } 312 IPCOMPSTAT_INC(ipcomps_noxform); 313 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 314 error = crp->crp_etype; 315 goto bad; 316 } 317 /* Shouldn't happen... */ 318 if (m == NULL) { 319 IPCOMPSTAT_INC(ipcomps_crypto); 320 DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 321 error = EINVAL; 322 goto bad; 323 } 324 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 325 326 clen = crp->crp_olen; /* Length of data after processing */ 327 328 /* Release the crypto descriptors */ 329 free(xd, M_XDATA), xd = NULL; 330 crypto_freereq(crp), crp = NULL; 331 332 /* In case it's not done already, adjust the size of the mbuf chain */ 333 m->m_pkthdr.len = clen + hlen + skip; 334 335 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) { 336 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/ 337 DPRINTF(("%s: m_pullup failed\n", __func__)); 338 error = EINVAL; /*XXX*/ 339 goto bad; 340 } 341 342 /* Keep the next protocol field */ 343 addr = (caddr_t) mtod(m, struct ip *) + skip; 344 nproto = ((struct ipcomp *) addr)->comp_nxt; 345 346 /* Remove the IPCOMP header */ 347 error = m_striphdr(m, skip, hlen); 348 if (error) { 349 IPCOMPSTAT_INC(ipcomps_hdrops); 350 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 351 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 352 (u_long) ntohl(sav->spi))); 353 goto bad; 354 } 355 356 /* Restore the Next Protocol field */ 357 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 358 359 switch (saidx->dst.sa.sa_family) { 360 #ifdef INET6 361 case AF_INET6: 362 error = ipsec6_common_input_cb(m, sav, skip, protoff); 363 break; 364 #endif 365 #ifdef INET 366 case AF_INET: 367 error = ipsec4_common_input_cb(m, sav, skip, protoff); 368 break; 369 #endif 370 default: 371 panic("%s: Unexpected address family: %d saidx=%p", __func__, 372 saidx->dst.sa.sa_family, saidx); 373 } 374 CURVNET_RESTORE(); 375 return error; 376 bad: 377 CURVNET_RESTORE(); 378 if (sav != NULL) 379 key_freesav(&sav); 380 if (m != NULL) 381 m_freem(m); 382 if (xd != NULL) 383 free(xd, M_XDATA); 384 if (crp != NULL) 385 crypto_freereq(crp); 386 return error; 387 } 388 389 /* 390 * IPComp output routine, called by ipsec[46]_perform_request() 391 */ 392 static int 393 ipcomp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav, 394 u_int idx, int skip, int protoff) 395 { 396 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 397 const struct comp_algo *ipcompx; 398 struct cryptodesc *crdc; 399 struct cryptop *crp; 400 struct xform_data *xd; 401 int error, ralen, maxpacketsize; 402 403 IPSEC_ASSERT(sav != NULL, ("null SA")); 404 ipcompx = sav->tdb_compalgxform; 405 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 406 407 /* 408 * Do not touch the packet in case our payload to compress 409 * is lower than the minimal threshold of the compression 410 * alogrithm. We will just send out the data uncompressed. 411 * See RFC 3173, 2.2. Non-Expansion Policy. 412 */ 413 if (m->m_pkthdr.len <= ipcompx->minlen) { 414 IPCOMPSTAT_INC(ipcomps_threshold); 415 return ipsec_process_done(m, sp, sav, idx); 416 } 417 418 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 419 IPCOMPSTAT_INC(ipcomps_output); 420 421 /* Check for maximum packet size violations. */ 422 switch (sav->sah->saidx.dst.sa.sa_family) { 423 #ifdef INET 424 case AF_INET: 425 maxpacketsize = IP_MAXPACKET; 426 break; 427 #endif /* INET */ 428 #ifdef INET6 429 case AF_INET6: 430 maxpacketsize = IPV6_MAXPACKET; 431 break; 432 #endif /* INET6 */ 433 default: 434 IPCOMPSTAT_INC(ipcomps_nopf); 435 DPRINTF(("%s: unknown/unsupported protocol family %d, " 436 "IPCA %s/%08lx\n", __func__, 437 sav->sah->saidx.dst.sa.sa_family, 438 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 439 (u_long) ntohl(sav->spi))); 440 error = EPFNOSUPPORT; 441 goto bad; 442 } 443 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 444 IPCOMPSTAT_INC(ipcomps_toobig); 445 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 446 "(len %u, max len %u)\n", __func__, 447 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 448 (u_long) ntohl(sav->spi), 449 ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 450 error = EMSGSIZE; 451 goto bad; 452 } 453 454 /* Update the counters */ 455 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip); 456 457 m = m_unshare(m, M_NOWAIT); 458 if (m == NULL) { 459 IPCOMPSTAT_INC(ipcomps_hdrops); 460 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 461 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 462 sizeof(buf)), (u_long) ntohl(sav->spi))); 463 error = ENOBUFS; 464 goto bad; 465 } 466 467 /* Ok now, we can pass to the crypto processing. */ 468 469 /* Get crypto descriptors */ 470 crp = crypto_getreq(1); 471 if (crp == NULL) { 472 IPCOMPSTAT_INC(ipcomps_crypto); 473 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 474 error = ENOBUFS; 475 goto bad; 476 } 477 crdc = crp->crp_desc; 478 479 /* Compression descriptor */ 480 crdc->crd_skip = skip; 481 crdc->crd_len = ralen; 482 crdc->crd_flags = CRD_F_COMP; 483 crdc->crd_inject = skip; 484 485 /* Compression operation */ 486 crdc->crd_alg = ipcompx->type; 487 488 /* IPsec-specific opaque crypto info */ 489 xd = malloc(sizeof(struct xform_data), M_XDATA, M_NOWAIT | M_ZERO); 490 if (xd == NULL) { 491 IPCOMPSTAT_INC(ipcomps_crypto); 492 DPRINTF(("%s: failed to allocate xform_data\n", __func__)); 493 crypto_freereq(crp); 494 error = ENOBUFS; 495 goto bad; 496 } 497 498 xd->sp = sp; 499 xd->sav = sav; 500 xd->idx = idx; 501 xd->skip = skip; 502 xd->protoff = protoff; 503 xd->vnet = curvnet; 504 505 /* Crypto operation descriptor */ 506 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 507 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 508 crp->crp_buf = (caddr_t) m; 509 crp->crp_callback = ipcomp_output_cb; 510 crp->crp_opaque = (caddr_t) xd; 511 512 SECASVAR_LOCK(sav); 513 crp->crp_sid = xd->cryptoid = sav->tdb_cryptoid; 514 SECASVAR_UNLOCK(sav); 515 516 return crypto_dispatch(crp); 517 bad: 518 if (m) 519 m_freem(m); 520 key_freesav(&sav); 521 key_freesp(&sp); 522 return (error); 523 } 524 525 /* 526 * IPComp output callback from the crypto driver. 527 */ 528 static int 529 ipcomp_output_cb(struct cryptop *crp) 530 { 531 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 532 struct xform_data *xd; 533 struct secpolicy *sp; 534 struct secasvar *sav; 535 struct mbuf *m; 536 uint64_t cryptoid; 537 u_int idx; 538 int error, skip, protoff; 539 540 m = (struct mbuf *) crp->crp_buf; 541 xd = (struct xform_data *) crp->crp_opaque; 542 CURVNET_SET(xd->vnet); 543 idx = xd->idx; 544 sp = xd->sp; 545 sav = xd->sav; 546 skip = xd->skip; 547 protoff = xd->protoff; 548 cryptoid = xd->cryptoid; 549 550 /* Check for crypto errors */ 551 if (crp->crp_etype) { 552 if (crp->crp_etype == EAGAIN) { 553 /* Reset the session ID */ 554 if (ipsec_updateid(sav, &crp->crp_sid, &cryptoid) != 0) 555 crypto_freesession(cryptoid); 556 xd->cryptoid = crp->crp_sid; 557 CURVNET_RESTORE(); 558 return (crypto_dispatch(crp)); 559 } 560 IPCOMPSTAT_INC(ipcomps_noxform); 561 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 562 error = crp->crp_etype; 563 goto bad; 564 } 565 /* Shouldn't happen... */ 566 if (m == NULL) { 567 IPCOMPSTAT_INC(ipcomps_crypto); 568 DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 569 error = EINVAL; 570 goto bad; 571 } 572 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]); 573 574 if (crp->crp_ilen - skip > crp->crp_olen) { 575 struct mbuf *mo; 576 struct ipcomp *ipcomp; 577 int roff; 578 uint8_t prot; 579 580 /* Compression helped, inject IPCOMP header. */ 581 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 582 if (mo == NULL) { 583 IPCOMPSTAT_INC(ipcomps_wrap); 584 DPRINTF(("%s: IPCOMP header inject failed " 585 "for IPCA %s/%08lx\n", 586 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 587 sizeof(buf)), (u_long) ntohl(sav->spi))); 588 error = ENOBUFS; 589 goto bad; 590 } 591 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 592 593 /* Initialize the IPCOMP header */ 594 /* XXX alignment always correct? */ 595 switch (sav->sah->saidx.dst.sa.sa_family) { 596 #ifdef INET 597 case AF_INET: 598 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 599 break; 600 #endif /* INET */ 601 #ifdef INET6 602 case AF_INET6: 603 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 604 break; 605 #endif 606 } 607 ipcomp->comp_flags = 0; 608 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 609 610 /* Fix Next Protocol in IPv4/IPv6 header */ 611 prot = IPPROTO_IPCOMP; 612 m_copyback(m, protoff, sizeof(u_int8_t), 613 (u_char *)&prot); 614 615 /* Adjust the length in the IP header */ 616 switch (sav->sah->saidx.dst.sa.sa_family) { 617 #ifdef INET 618 case AF_INET: 619 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 620 break; 621 #endif /* INET */ 622 #ifdef INET6 623 case AF_INET6: 624 mtod(m, struct ip6_hdr *)->ip6_plen = 625 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 626 break; 627 #endif /* INET6 */ 628 default: 629 IPCOMPSTAT_INC(ipcomps_nopf); 630 DPRINTF(("%s: unknown/unsupported protocol " 631 "family %d, IPCA %s/%08lx\n", __func__, 632 sav->sah->saidx.dst.sa.sa_family, 633 ipsec_address(&sav->sah->saidx.dst, buf, 634 sizeof(buf)), (u_long) ntohl(sav->spi))); 635 error = EPFNOSUPPORT; 636 goto bad; 637 } 638 } else { 639 /* Compression was useless, we have lost time. */ 640 IPCOMPSTAT_INC(ipcomps_uncompr); 641 DPRINTF(("%s: compressions was useless %d - %d <= %d\n", 642 __func__, crp->crp_ilen, skip, crp->crp_olen)); 643 /* XXX remember state to not compress the next couple 644 * of packets, RFC 3173, 2.2. Non-Expansion Policy */ 645 } 646 647 /* Release the crypto descriptor */ 648 free(xd, M_XDATA); 649 crypto_freereq(crp); 650 651 /* NB: m is reclaimed by ipsec_process_done. */ 652 error = ipsec_process_done(m, sp, sav, idx); 653 CURVNET_RESTORE(); 654 return (error); 655 bad: 656 if (m) 657 m_freem(m); 658 CURVNET_RESTORE(); 659 free(xd, M_XDATA); 660 crypto_freereq(crp); 661 key_freesav(&sav); 662 key_freesp(&sp); 663 return (error); 664 } 665 666 #ifdef INET 667 static const struct encaptab *ipe4_cookie = NULL; 668 extern struct domain inetdomain; 669 static struct protosw ipcomp4_protosw = { 670 .pr_type = SOCK_RAW, 671 .pr_domain = &inetdomain, 672 .pr_protocol = 0 /* IPPROTO_IPV[46] */, 673 .pr_flags = PR_ATOMIC | PR_ADDR | PR_LASTHDR, 674 .pr_input = ipcomp_nonexp_input, 675 .pr_output = rip_output, 676 .pr_ctloutput = rip_ctloutput, 677 .pr_usrreqs = &rip_usrreqs 678 }; 679 680 static int 681 ipcomp4_nonexp_encapcheck(const struct mbuf *m, int off, int proto, 682 void *arg __unused) 683 { 684 union sockaddr_union src, dst; 685 const struct ip *ip; 686 687 if (V_ipcomp_enable == 0) 688 return (0); 689 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6) 690 return (0); 691 bzero(&src, sizeof(src)); 692 bzero(&dst, sizeof(dst)); 693 src.sa.sa_family = dst.sa.sa_family = AF_INET; 694 src.sin.sin_len = dst.sin.sin_len = sizeof(struct sockaddr_in); 695 ip = mtod(m, const struct ip *); 696 src.sin.sin_addr = ip->ip_src; 697 dst.sin.sin_addr = ip->ip_dst; 698 return (ipcomp_encapcheck(&src, &dst)); 699 } 700 #endif 701 #ifdef INET6 702 static const struct encaptab *ipe6_cookie = NULL; 703 extern struct domain inet6domain; 704 static struct protosw ipcomp6_protosw = { 705 .pr_type = SOCK_RAW, 706 .pr_domain = &inet6domain, 707 .pr_protocol = 0 /* IPPROTO_IPV[46] */, 708 .pr_flags = PR_ATOMIC | PR_ADDR | PR_LASTHDR, 709 .pr_input = ipcomp_nonexp_input, 710 .pr_output = rip6_output, 711 .pr_ctloutput = rip6_ctloutput, 712 .pr_usrreqs = &rip6_usrreqs 713 }; 714 715 static int 716 ipcomp6_nonexp_encapcheck(const struct mbuf *m, int off, int proto, 717 void *arg __unused) 718 { 719 union sockaddr_union src, dst; 720 const struct ip6_hdr *ip6; 721 722 if (V_ipcomp_enable == 0) 723 return (0); 724 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6) 725 return (0); 726 bzero(&src, sizeof(src)); 727 bzero(&dst, sizeof(dst)); 728 src.sa.sa_family = dst.sa.sa_family = AF_INET; 729 src.sin6.sin6_len = dst.sin6.sin6_len = sizeof(struct sockaddr_in6); 730 ip6 = mtod(m, const struct ip6_hdr *); 731 src.sin6.sin6_addr = ip6->ip6_src; 732 dst.sin6.sin6_addr = ip6->ip6_dst; 733 if (IN6_IS_SCOPE_LINKLOCAL(&src.sin6.sin6_addr)) { 734 /* XXX: sa6_recoverscope() */ 735 src.sin6.sin6_scope_id = 736 ntohs(src.sin6.sin6_addr.s6_addr16[1]); 737 src.sin6.sin6_addr.s6_addr16[1] = 0; 738 } 739 if (IN6_IS_SCOPE_LINKLOCAL(&dst.sin6.sin6_addr)) { 740 /* XXX: sa6_recoverscope() */ 741 dst.sin6.sin6_scope_id = 742 ntohs(dst.sin6.sin6_addr.s6_addr16[1]); 743 dst.sin6.sin6_addr.s6_addr16[1] = 0; 744 } 745 return (ipcomp_encapcheck(&src, &dst)); 746 } 747 #endif 748 749 static struct xformsw ipcomp_xformsw = { 750 .xf_type = XF_IPCOMP, 751 .xf_name = "IPcomp", 752 .xf_init = ipcomp_init, 753 .xf_zeroize = ipcomp_zeroize, 754 .xf_input = ipcomp_input, 755 .xf_output = ipcomp_output, 756 }; 757 758 static void 759 ipcomp_attach(void) 760 { 761 762 #ifdef INET 763 ipe4_cookie = encap_attach_func(AF_INET, -1, 764 ipcomp4_nonexp_encapcheck, &ipcomp4_protosw, NULL); 765 #endif 766 #ifdef INET6 767 ipe6_cookie = encap_attach_func(AF_INET6, -1, 768 ipcomp6_nonexp_encapcheck, &ipcomp6_protosw, NULL); 769 #endif 770 xform_attach(&ipcomp_xformsw); 771 } 772 773 static void 774 ipcomp_detach(void) 775 { 776 777 #ifdef INET 778 encap_detach(ipe4_cookie); 779 #endif 780 #ifdef INET6 781 encap_detach(ipe6_cookie); 782 #endif 783 xform_detach(&ipcomp_xformsw); 784 } 785 786 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 787 ipcomp_attach, NULL); 788 SYSUNINIT(ipcomp_xform_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 789 ipcomp_detach, NULL);
Cache object: 87f9c29311bc76e81e7158d5393bb410
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