Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netipsec/xform_ipcomp.c
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1 /* $FreeBSD: releng/7.3/sys/netipsec/xform_ipcomp.c 201244 2009-12-30 00:03:36Z bz $ */ 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 50 #include <net/route.h> 51 #include <netipsec/ipsec.h> 52 #include <netipsec/xform.h> 53 54 #ifdef INET6 55 #include <netinet/ip6.h> 56 #include <netipsec/ipsec6.h> 57 #endif 58 59 #include <netipsec/ipcomp.h> 60 #include <netipsec/ipcomp_var.h> 61 62 #include <netipsec/key.h> 63 #include <netipsec/key_debug.h> 64 65 #include <opencrypto/cryptodev.h> 66 #include <opencrypto/deflate.h> 67 #include <opencrypto/xform.h> 68 69 int ipcomp_enable = 1; 70 struct ipcompstat ipcompstat; 71 72 SYSCTL_DECL(_net_inet_ipcomp); 73 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, 74 ipcomp_enable, CTLFLAG_RW, &ipcomp_enable, 0, ""); 75 SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS, 76 stats, CTLFLAG_RD, &ipcompstat, ipcompstat, ""); 77 78 static int ipcomp_input_cb(struct cryptop *crp); 79 static int ipcomp_output_cb(struct cryptop *crp); 80 81 struct comp_algo * 82 ipcomp_algorithm_lookup(int alg) 83 { 84 if (alg >= IPCOMP_ALG_MAX) 85 return NULL; 86 switch (alg) { 87 case SADB_X_CALG_DEFLATE: 88 return &comp_algo_deflate; 89 } 90 return NULL; 91 } 92 93 /* 94 * ipcomp_init() is called when an CPI is being set up. 95 */ 96 static int 97 ipcomp_init(struct secasvar *sav, struct xformsw *xsp) 98 { 99 struct comp_algo *tcomp; 100 struct cryptoini cric; 101 102 /* NB: algorithm really comes in alg_enc and not alg_comp! */ 103 tcomp = ipcomp_algorithm_lookup(sav->alg_enc); 104 if (tcomp == NULL) { 105 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__, 106 sav->alg_comp)); 107 return EINVAL; 108 } 109 sav->alg_comp = sav->alg_enc; /* set for doing histogram */ 110 sav->tdb_xform = xsp; 111 sav->tdb_compalgxform = tcomp; 112 113 /* Initialize crypto session */ 114 bzero(&cric, sizeof (cric)); 115 cric.cri_alg = sav->tdb_compalgxform->type; 116 117 return crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support); 118 } 119 120 /* 121 * ipcomp_zeroize() used when IPCA is deleted 122 */ 123 static int 124 ipcomp_zeroize(struct secasvar *sav) 125 { 126 int err; 127 128 err = crypto_freesession(sav->tdb_cryptoid); 129 sav->tdb_cryptoid = 0; 130 return err; 131 } 132 133 /* 134 * ipcomp_input() gets called to uncompress an input packet 135 */ 136 static int 137 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 138 { 139 struct tdb_crypto *tc; 140 struct cryptodesc *crdc; 141 struct cryptop *crp; 142 int hlen = IPCOMP_HLENGTH; 143 144 IPSEC_SPLASSERT_SOFTNET(__func__); 145 146 /* Get crypto descriptors */ 147 crp = crypto_getreq(1); 148 if (crp == NULL) { 149 m_freem(m); 150 DPRINTF(("%s: no crypto descriptors\n", __func__)); 151 ipcompstat.ipcomps_crypto++; 152 return ENOBUFS; 153 } 154 /* Get IPsec-specific opaque pointer */ 155 tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO); 156 if (tc == NULL) { 157 m_freem(m); 158 crypto_freereq(crp); 159 DPRINTF(("%s: cannot allocate tdb_crypto\n", __func__)); 160 ipcompstat.ipcomps_crypto++; 161 return ENOBUFS; 162 } 163 crdc = crp->crp_desc; 164 165 crdc->crd_skip = skip + hlen; 166 crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 167 crdc->crd_inject = skip; 168 169 tc->tc_ptr = 0; 170 171 /* Decompression operation */ 172 crdc->crd_alg = sav->tdb_compalgxform->type; 173 174 /* Crypto operation descriptor */ 175 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 176 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 177 crp->crp_buf = (caddr_t) m; 178 crp->crp_callback = ipcomp_input_cb; 179 crp->crp_sid = sav->tdb_cryptoid; 180 crp->crp_opaque = (caddr_t) tc; 181 182 /* These are passed as-is to the callback */ 183 tc->tc_spi = sav->spi; 184 tc->tc_dst = sav->sah->saidx.dst; 185 tc->tc_proto = sav->sah->saidx.proto; 186 tc->tc_protoff = protoff; 187 tc->tc_skip = skip; 188 189 return crypto_dispatch(crp); 190 } 191 192 #ifdef INET6 193 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \ 194 if (saidx->dst.sa.sa_family == AF_INET6) { \ 195 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \ 196 } else { \ 197 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \ 198 } \ 199 } while (0) 200 #else 201 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \ 202 (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag)) 203 #endif 204 205 /* 206 * IPComp input callback from the crypto driver. 207 */ 208 static int 209 ipcomp_input_cb(struct cryptop *crp) 210 { 211 struct cryptodesc *crd; 212 struct tdb_crypto *tc; 213 int skip, protoff; 214 struct mtag *mtag; 215 struct mbuf *m; 216 struct secasvar *sav; 217 struct secasindex *saidx; 218 int hlen = IPCOMP_HLENGTH, error, clen; 219 u_int8_t nproto; 220 caddr_t addr; 221 222 crd = crp->crp_desc; 223 224 tc = (struct tdb_crypto *) crp->crp_opaque; 225 IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!")); 226 skip = tc->tc_skip; 227 protoff = tc->tc_protoff; 228 mtag = (struct mtag *) tc->tc_ptr; 229 m = (struct mbuf *) crp->crp_buf; 230 231 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi); 232 if (sav == NULL) { 233 ipcompstat.ipcomps_notdb++; 234 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 235 error = ENOBUFS; /*XXX*/ 236 goto bad; 237 } 238 239 saidx = &sav->sah->saidx; 240 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 241 saidx->dst.sa.sa_family == AF_INET6, 242 ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 243 244 /* Check for crypto errors */ 245 if (crp->crp_etype) { 246 /* Reset the session ID */ 247 if (sav->tdb_cryptoid != 0) 248 sav->tdb_cryptoid = crp->crp_sid; 249 250 if (crp->crp_etype == EAGAIN) { 251 KEY_FREESAV(&sav); 252 return crypto_dispatch(crp); 253 } 254 ipcompstat.ipcomps_noxform++; 255 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 256 error = crp->crp_etype; 257 goto bad; 258 } 259 /* Shouldn't happen... */ 260 if (m == NULL) { 261 ipcompstat.ipcomps_crypto++; 262 DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 263 error = EINVAL; 264 goto bad; 265 } 266 ipcompstat.ipcomps_hist[sav->alg_comp]++; 267 268 clen = crp->crp_olen; /* Length of data after processing */ 269 270 /* Release the crypto descriptors */ 271 free(tc, M_XDATA), tc = NULL; 272 crypto_freereq(crp), crp = NULL; 273 274 /* In case it's not done already, adjust the size of the mbuf chain */ 275 m->m_pkthdr.len = clen + hlen + skip; 276 277 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { 278 ipcompstat.ipcomps_hdrops++; /*XXX*/ 279 DPRINTF(("%s: m_pullup failed\n", __func__)); 280 error = EINVAL; /*XXX*/ 281 goto bad; 282 } 283 284 /* Keep the next protocol field */ 285 addr = (caddr_t) mtod(m, struct ip *) + skip; 286 nproto = ((struct ipcomp *) addr)->comp_nxt; 287 288 /* Remove the IPCOMP header */ 289 error = m_striphdr(m, skip, hlen); 290 if (error) { 291 ipcompstat.ipcomps_hdrops++; 292 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 293 ipsec_address(&sav->sah->saidx.dst), 294 (u_long) ntohl(sav->spi))); 295 goto bad; 296 } 297 298 /* Restore the Next Protocol field */ 299 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 300 301 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL); 302 303 KEY_FREESAV(&sav); 304 return error; 305 bad: 306 if (sav) 307 KEY_FREESAV(&sav); 308 if (m) 309 m_freem(m); 310 if (tc != NULL) 311 free(tc, M_XDATA); 312 if (crp) 313 crypto_freereq(crp); 314 return error; 315 } 316 317 /* 318 * IPComp output routine, called by ipsec[46]_process_packet() 319 */ 320 static int 321 ipcomp_output( 322 struct mbuf *m, 323 struct ipsecrequest *isr, 324 struct mbuf **mp, 325 int skip, 326 int protoff 327 ) 328 { 329 struct secasvar *sav; 330 struct comp_algo *ipcompx; 331 int error, ralen, maxpacketsize; 332 struct cryptodesc *crdc; 333 struct cryptop *crp; 334 struct tdb_crypto *tc; 335 336 IPSEC_SPLASSERT_SOFTNET(__func__); 337 338 sav = isr->sav; 339 IPSEC_ASSERT(sav != NULL, ("null SA")); 340 ipcompx = sav->tdb_compalgxform; 341 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 342 343 /* 344 * Do not touch the packet in case our payload to compress 345 * is lower than the minimal threshold of the compression 346 * alogrithm. We will just send out the data uncompressed. 347 * See RFC 3173, 2.2. Non-Expansion Policy. 348 */ 349 if (m->m_pkthdr.len <= ipcompx->minlen) { 350 ipcompstat.ipcomps_threshold++; 351 return ipsec_process_done(m, isr); 352 } 353 354 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 355 ipcompstat.ipcomps_output++; 356 357 /* Check for maximum packet size violations. */ 358 switch (sav->sah->saidx.dst.sa.sa_family) { 359 #ifdef INET 360 case AF_INET: 361 maxpacketsize = IP_MAXPACKET; 362 break; 363 #endif /* INET */ 364 #ifdef INET6 365 case AF_INET6: 366 maxpacketsize = IPV6_MAXPACKET; 367 break; 368 #endif /* INET6 */ 369 default: 370 ipcompstat.ipcomps_nopf++; 371 DPRINTF(("%s: unknown/unsupported protocol family %d, " 372 "IPCA %s/%08lx\n", __func__, 373 sav->sah->saidx.dst.sa.sa_family, 374 ipsec_address(&sav->sah->saidx.dst), 375 (u_long) ntohl(sav->spi))); 376 error = EPFNOSUPPORT; 377 goto bad; 378 } 379 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 380 ipcompstat.ipcomps_toobig++; 381 DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 382 "(len %u, max len %u)\n", __func__, 383 ipsec_address(&sav->sah->saidx.dst), 384 (u_long) ntohl(sav->spi), 385 ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 386 error = EMSGSIZE; 387 goto bad; 388 } 389 390 /* Update the counters */ 391 ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip; 392 393 m = m_unshare(m, M_NOWAIT); 394 if (m == NULL) { 395 ipcompstat.ipcomps_hdrops++; 396 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 397 __func__, ipsec_address(&sav->sah->saidx.dst), 398 (u_long) ntohl(sav->spi))); 399 error = ENOBUFS; 400 goto bad; 401 } 402 403 /* Ok now, we can pass to the crypto processing. */ 404 405 /* Get crypto descriptors */ 406 crp = crypto_getreq(1); 407 if (crp == NULL) { 408 ipcompstat.ipcomps_crypto++; 409 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 410 error = ENOBUFS; 411 goto bad; 412 } 413 crdc = crp->crp_desc; 414 415 /* Compression descriptor */ 416 crdc->crd_skip = skip; 417 crdc->crd_len = ralen; 418 crdc->crd_flags = CRD_F_COMP; 419 crdc->crd_inject = skip; 420 421 /* Compression operation */ 422 crdc->crd_alg = ipcompx->type; 423 424 /* IPsec-specific opaque crypto info */ 425 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto), 426 M_XDATA, M_NOWAIT|M_ZERO); 427 if (tc == NULL) { 428 ipcompstat.ipcomps_crypto++; 429 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__)); 430 crypto_freereq(crp); 431 error = ENOBUFS; 432 goto bad; 433 } 434 435 tc->tc_isr = isr; 436 tc->tc_spi = sav->spi; 437 tc->tc_dst = sav->sah->saidx.dst; 438 tc->tc_proto = sav->sah->saidx.proto; 439 tc->tc_protoff = protoff; 440 tc->tc_skip = skip; 441 442 /* Crypto operation descriptor */ 443 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 444 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 445 crp->crp_buf = (caddr_t) m; 446 crp->crp_callback = ipcomp_output_cb; 447 crp->crp_opaque = (caddr_t) tc; 448 crp->crp_sid = sav->tdb_cryptoid; 449 450 return crypto_dispatch(crp); 451 bad: 452 if (m) 453 m_freem(m); 454 return (error); 455 } 456 457 /* 458 * IPComp output callback from the crypto driver. 459 */ 460 static int 461 ipcomp_output_cb(struct cryptop *crp) 462 { 463 struct tdb_crypto *tc; 464 struct ipsecrequest *isr; 465 struct secasvar *sav; 466 struct mbuf *m; 467 int error, skip; 468 469 tc = (struct tdb_crypto *) crp->crp_opaque; 470 IPSEC_ASSERT(tc != NULL, ("null opaque data area!")); 471 m = (struct mbuf *) crp->crp_buf; 472 skip = tc->tc_skip; 473 474 isr = tc->tc_isr; 475 IPSECREQUEST_LOCK(isr); 476 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi); 477 if (sav == NULL) { 478 ipcompstat.ipcomps_notdb++; 479 DPRINTF(("%s: SA expired while in crypto\n", __func__)); 480 error = ENOBUFS; /*XXX*/ 481 goto bad; 482 } 483 IPSEC_ASSERT(isr->sav == sav, ("SA changed\n")); 484 485 /* Check for crypto errors */ 486 if (crp->crp_etype) { 487 /* Reset the session ID */ 488 if (sav->tdb_cryptoid != 0) 489 sav->tdb_cryptoid = crp->crp_sid; 490 491 if (crp->crp_etype == EAGAIN) { 492 KEY_FREESAV(&sav); 493 IPSECREQUEST_UNLOCK(isr); 494 return crypto_dispatch(crp); 495 } 496 ipcompstat.ipcomps_noxform++; 497 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 498 error = crp->crp_etype; 499 goto bad; 500 } 501 /* Shouldn't happen... */ 502 if (m == NULL) { 503 ipcompstat.ipcomps_crypto++; 504 DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 505 error = EINVAL; 506 goto bad; 507 } 508 ipcompstat.ipcomps_hist[sav->alg_comp]++; 509 510 if (crp->crp_ilen - skip > crp->crp_olen) { 511 struct mbuf *mo; 512 struct ipcomp *ipcomp; 513 int roff; 514 uint8_t prot; 515 516 /* Compression helped, inject IPCOMP header. */ 517 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 518 if (mo == NULL) { 519 ipcompstat.ipcomps_wrap++; 520 DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n", 521 __func__, ipsec_address(&sav->sah->saidx.dst), 522 (u_long) ntohl(sav->spi))); 523 error = ENOBUFS; 524 goto bad; 525 } 526 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 527 528 /* Initialize the IPCOMP header */ 529 /* XXX alignment always correct? */ 530 switch (sav->sah->saidx.dst.sa.sa_family) { 531 #ifdef INET 532 case AF_INET: 533 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 534 break; 535 #endif /* INET */ 536 #ifdef INET6 537 case AF_INET6: 538 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 539 break; 540 #endif 541 } 542 ipcomp->comp_flags = 0; 543 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 544 545 /* Fix Next Protocol in IPv4/IPv6 header */ 546 prot = IPPROTO_IPCOMP; 547 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t), 548 (u_char *)&prot); 549 550 /* Adjust the length in the IP header */ 551 switch (sav->sah->saidx.dst.sa.sa_family) { 552 #ifdef INET 553 case AF_INET: 554 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 555 break; 556 #endif /* INET */ 557 #ifdef INET6 558 case AF_INET6: 559 mtod(m, struct ip6_hdr *)->ip6_plen = 560 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 561 break; 562 #endif /* INET6 */ 563 default: 564 ipcompstat.ipcomps_nopf++; 565 DPRINTF(("%s: unknown/unsupported protocol " 566 "family %d, IPCA %s/%08lx\n", __func__, 567 sav->sah->saidx.dst.sa.sa_family, 568 ipsec_address(&sav->sah->saidx.dst), 569 (u_long) ntohl(sav->spi))); 570 error = EPFNOSUPPORT; 571 goto bad; 572 } 573 } else { 574 /* Compression was useless, we have lost time. */ 575 ipcompstat.ipcomps_uncompr++; 576 DPRINTF(("%s: compressions was useless %d - %d <= %d\n", 577 __func__, crp->crp_ilen, skip, crp->crp_olen)); 578 /* XXX remember state to not compress the next couple 579 * of packets, RFC 3173, 2.2. Non-Expansion Policy */ 580 } 581 582 /* Release the crypto descriptor */ 583 free(tc, M_XDATA); 584 crypto_freereq(crp); 585 586 /* NB: m is reclaimed by ipsec_process_done. */ 587 error = ipsec_process_done(m, isr); 588 KEY_FREESAV(&sav); 589 IPSECREQUEST_UNLOCK(isr); 590 return error; 591 bad: 592 if (sav) 593 KEY_FREESAV(&sav); 594 IPSECREQUEST_UNLOCK(isr); 595 if (m) 596 m_freem(m); 597 free(tc, M_XDATA); 598 crypto_freereq(crp); 599 return error; 600 } 601 602 static struct xformsw ipcomp_xformsw = { 603 XF_IPCOMP, XFT_COMP, "IPcomp", 604 ipcomp_init, ipcomp_zeroize, ipcomp_input, 605 ipcomp_output 606 }; 607 608 static void 609 ipcomp_attach(void) 610 { 611 612 ipcompstat.version = IPCOMPSTAT_VERSION; 613 xform_register(&ipcomp_xformsw); 614 } 615 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL);
Cache object: 3e60d5aa0066fcb8021522a075bae135
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