Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
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 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/mbuf.h> 38 #include <sys/socket.h> 39 #include <sys/kernel.h> 40 #include <sys/protosw.h> 41 #include <sys/sysctl.h> 42 43 #include <netinet/in.h> 44 #include <netinet/in_systm.h> 45 #include <netinet/ip.h> 46 #include <netinet/ip_var.h> 47 48 #include <net/route.h> 49 #include <netipsec/ipsec.h> 50 #include <netipsec/xform.h> 51 52 #ifdef INET6 53 #include <netinet/ip6.h> 54 #include <netipsec/ipsec6.h> 55 #endif 56 57 #include <netipsec/ipcomp.h> 58 #include <netipsec/ipcomp_var.h> 59 60 #include <netipsec/key.h> 61 #include <netipsec/key_debug.h> 62 63 #include <opencrypto/cryptodev.h> 64 #include <opencrypto/deflate.h> 65 #include <opencrypto/xform.h> 66 67 int ipcomp_enable = 0; 68 struct ipcompstat ipcompstat; 69 70 SYSCTL_DECL(_net_inet_ipcomp); 71 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, 72 ipcomp_enable, CTLFLAG_RW, &ipcomp_enable, 0, ""); 73 SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS, 74 stats, CTLFLAG_RD, &ipcompstat, ipcompstat, ""); 75 76 static int ipcomp_input_cb(struct cryptop *crp); 77 static int ipcomp_output_cb(struct cryptop *crp); 78 79 struct comp_algo * 80 ipcomp_algorithm_lookup(int alg) 81 { 82 if (alg >= IPCOMP_ALG_MAX) 83 return NULL; 84 switch (alg) { 85 case SADB_X_CALG_DEFLATE: 86 return &comp_algo_deflate; 87 } 88 return NULL; 89 } 90 91 /* 92 * ipcomp_init() is called when an CPI is being set up. 93 */ 94 static int 95 ipcomp_init(struct secasvar *sav, struct xformsw *xsp) 96 { 97 struct comp_algo *tcomp; 98 struct cryptoini cric; 99 100 /* NB: algorithm really comes in alg_enc and not alg_comp! */ 101 tcomp = ipcomp_algorithm_lookup(sav->alg_enc); 102 if (tcomp == NULL) { 103 DPRINTF(("ipcomp_init: unsupported compression algorithm %d\n", 104 sav->alg_comp)); 105 return EINVAL; 106 } 107 sav->alg_comp = sav->alg_enc; /* set for doing histogram */ 108 sav->tdb_xform = xsp; 109 sav->tdb_compalgxform = tcomp; 110 111 /* Initialize crypto session */ 112 bzero(&cric, sizeof (cric)); 113 cric.cri_alg = sav->tdb_compalgxform->type; 114 115 return crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support); 116 } 117 118 /* 119 * ipcomp_zeroize() used when IPCA is deleted 120 */ 121 static int 122 ipcomp_zeroize(struct secasvar *sav) 123 { 124 int err; 125 126 err = crypto_freesession(sav->tdb_cryptoid); 127 sav->tdb_cryptoid = 0; 128 return err; 129 } 130 131 /* 132 * ipcomp_input() gets called to uncompress an input packet 133 */ 134 static int 135 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 136 { 137 struct tdb_crypto *tc; 138 struct cryptodesc *crdc; 139 struct cryptop *crp; 140 int hlen = IPCOMP_HLENGTH; 141 142 SPLASSERT(net, "ipcomp_input"); 143 144 /* Get crypto descriptors */ 145 crp = crypto_getreq(1); 146 if (crp == NULL) { 147 m_freem(m); 148 DPRINTF(("ipcomp_input: no crypto descriptors\n")); 149 ipcompstat.ipcomps_crypto++; 150 return ENOBUFS; 151 } 152 /* Get IPsec-specific opaque pointer */ 153 tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO); 154 if (tc == NULL) { 155 m_freem(m); 156 crypto_freereq(crp); 157 DPRINTF(("ipcomp_input: cannot allocate tdb_crypto\n")); 158 ipcompstat.ipcomps_crypto++; 159 return ENOBUFS; 160 } 161 crdc = crp->crp_desc; 162 163 crdc->crd_skip = skip + hlen; 164 crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 165 crdc->crd_inject = skip; 166 167 tc->tc_ptr = 0; 168 169 /* Decompression operation */ 170 crdc->crd_alg = sav->tdb_compalgxform->type; 171 172 /* Crypto operation descriptor */ 173 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 174 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 175 crp->crp_buf = (caddr_t) m; 176 crp->crp_callback = ipcomp_input_cb; 177 crp->crp_sid = sav->tdb_cryptoid; 178 crp->crp_opaque = (caddr_t) tc; 179 180 /* These are passed as-is to the callback */ 181 tc->tc_spi = sav->spi; 182 tc->tc_dst = sav->sah->saidx.dst; 183 tc->tc_proto = sav->sah->saidx.proto; 184 tc->tc_protoff = protoff; 185 tc->tc_skip = skip; 186 187 return crypto_dispatch(crp); 188 } 189 190 #ifdef INET6 191 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \ 192 if (saidx->dst.sa.sa_family == AF_INET6) { \ 193 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \ 194 } else { \ 195 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \ 196 } \ 197 } while (0) 198 #else 199 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \ 200 (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag)) 201 #endif 202 203 /* 204 * IPComp input callback from the crypto driver. 205 */ 206 static int 207 ipcomp_input_cb(struct cryptop *crp) 208 { 209 struct cryptodesc *crd; 210 struct tdb_crypto *tc; 211 int skip, protoff; 212 struct mtag *mtag; 213 struct mbuf *m; 214 struct secasvar *sav; 215 struct secasindex *saidx; 216 int s, hlen = IPCOMP_HLENGTH, error, clen; 217 u_int8_t nproto; 218 caddr_t addr; 219 220 crd = crp->crp_desc; 221 222 tc = (struct tdb_crypto *) crp->crp_opaque; 223 KASSERT(tc != NULL, ("ipcomp_input_cb: null opaque crypto data area!")); 224 skip = tc->tc_skip; 225 protoff = tc->tc_protoff; 226 mtag = (struct mtag *) tc->tc_ptr; 227 m = (struct mbuf *) crp->crp_buf; 228 229 s = splnet(); 230 231 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi); 232 if (sav == NULL) { 233 ipcompstat.ipcomps_notdb++; 234 DPRINTF(("ipcomp_input_cb: SA expired while in crypto\n")); 235 error = ENOBUFS; /*XXX*/ 236 goto bad; 237 } 238 239 saidx = &sav->sah->saidx; 240 KASSERT(saidx->dst.sa.sa_family == AF_INET || 241 saidx->dst.sa.sa_family == AF_INET6, 242 ("ah_input_cb: unexpected protocol family %u", 243 saidx->dst.sa.sa_family)); 244 245 /* Check for crypto errors */ 246 if (crp->crp_etype) { 247 /* Reset the session ID */ 248 if (sav->tdb_cryptoid != 0) 249 sav->tdb_cryptoid = crp->crp_sid; 250 251 if (crp->crp_etype == EAGAIN) { 252 KEY_FREESAV(&sav); 253 splx(s); 254 return crypto_dispatch(crp); 255 } 256 257 ipcompstat.ipcomps_noxform++; 258 DPRINTF(("ipcomp_input_cb: crypto error %d\n", crp->crp_etype)); 259 error = crp->crp_etype; 260 goto bad; 261 } 262 /* Shouldn't happen... */ 263 if (m == NULL) { 264 ipcompstat.ipcomps_crypto++; 265 DPRINTF(("ipcomp_input_cb: null mbuf returned from crypto\n")); 266 error = EINVAL; 267 goto bad; 268 } 269 ipcompstat.ipcomps_hist[sav->alg_comp]++; 270 271 clen = crp->crp_olen; /* Length of data after processing */ 272 273 /* Release the crypto descriptors */ 274 free(tc, M_XDATA), tc = NULL; 275 crypto_freereq(crp), crp = NULL; 276 277 /* In case it's not done already, adjust the size of the mbuf chain */ 278 m->m_pkthdr.len = clen + hlen + skip; 279 280 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { 281 ipcompstat.ipcomps_hdrops++; /*XXX*/ 282 DPRINTF(("ipcomp_input_cb: m_pullup failed\n")); 283 error = EINVAL; /*XXX*/ 284 goto bad; 285 } 286 287 /* Keep the next protocol field */ 288 addr = (caddr_t) mtod(m, struct ip *) + skip; 289 nproto = ((struct ipcomp *) addr)->comp_nxt; 290 291 /* Remove the IPCOMP header */ 292 error = m_striphdr(m, skip, hlen); 293 if (error) { 294 ipcompstat.ipcomps_hdrops++; 295 DPRINTF(("ipcomp_input_cb: bad mbuf chain, IPCA %s/%08lx\n", 296 ipsec_address(&sav->sah->saidx.dst), 297 (u_long) ntohl(sav->spi))); 298 goto bad; 299 } 300 301 /* Restore the Next Protocol field */ 302 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 303 304 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL); 305 306 KEY_FREESAV(&sav); 307 splx(s); 308 return error; 309 bad: 310 if (sav) 311 KEY_FREESAV(&sav); 312 splx(s); 313 if (m) 314 m_freem(m); 315 if (tc != NULL) 316 free(tc, M_XDATA); 317 if (crp) 318 crypto_freereq(crp); 319 return error; 320 } 321 322 /* 323 * IPComp output routine, called by ipsec[46]_process_packet() 324 */ 325 static int 326 ipcomp_output( 327 struct mbuf *m, 328 struct ipsecrequest *isr, 329 struct mbuf **mp, 330 int skip, 331 int protoff 332 ) 333 { 334 struct secasvar *sav; 335 struct comp_algo *ipcompx; 336 int error, ralen, hlen, maxpacketsize, roff; 337 u_int8_t prot; 338 struct cryptodesc *crdc; 339 struct cryptop *crp; 340 struct tdb_crypto *tc; 341 struct mbuf *mo; 342 struct ipcomp *ipcomp; 343 344 SPLASSERT(net, "ipcomp_output"); 345 346 sav = isr->sav; 347 KASSERT(sav != NULL, ("ipcomp_output: null SA")); 348 ipcompx = sav->tdb_compalgxform; 349 KASSERT(ipcompx != NULL, ("ipcomp_output: null compression xform")); 350 351 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 352 hlen = IPCOMP_HLENGTH; 353 354 ipcompstat.ipcomps_output++; 355 356 /* Check for maximum packet size violations. */ 357 switch (sav->sah->saidx.dst.sa.sa_family) { 358 #ifdef INET 359 case AF_INET: 360 maxpacketsize = IP_MAXPACKET; 361 break; 362 #endif /* INET */ 363 #ifdef INET6 364 case AF_INET6: 365 maxpacketsize = IPV6_MAXPACKET; 366 break; 367 #endif /* INET6 */ 368 default: 369 ipcompstat.ipcomps_nopf++; 370 DPRINTF(("ipcomp_output: unknown/unsupported protocol family %d" 371 ", IPCA %s/%08lx\n", 372 sav->sah->saidx.dst.sa.sa_family, 373 ipsec_address(&sav->sah->saidx.dst), 374 (u_long) ntohl(sav->spi))); 375 error = EPFNOSUPPORT; 376 goto bad; 377 } 378 if (skip + hlen + ralen > maxpacketsize) { 379 ipcompstat.ipcomps_toobig++; 380 DPRINTF(("ipcomp_output: packet in IPCA %s/%08lx got too big " 381 "(len %u, max len %u)\n", 382 ipsec_address(&sav->sah->saidx.dst), 383 (u_long) ntohl(sav->spi), 384 skip + hlen + ralen, maxpacketsize)); 385 error = EMSGSIZE; 386 goto bad; 387 } 388 389 /* Update the counters */ 390 ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip; 391 392 m = m_clone(m); 393 if (m == NULL) { 394 ipcompstat.ipcomps_hdrops++; 395 DPRINTF(("ipcomp_output: cannot clone mbuf chain, IPCA %s/%08lx\n", 396 ipsec_address(&sav->sah->saidx.dst), 397 (u_long) ntohl(sav->spi))); 398 error = ENOBUFS; 399 goto bad; 400 } 401 402 /* Inject IPCOMP header */ 403 mo = m_makespace(m, skip, hlen, &roff); 404 if (mo == NULL) { 405 ipcompstat.ipcomps_wrap++; 406 DPRINTF(("ipcomp_output: failed to inject IPCOMP header for " 407 "IPCA %s/%08lx\n", 408 ipsec_address(&sav->sah->saidx.dst), 409 (u_long) ntohl(sav->spi))); 410 error = ENOBUFS; 411 goto bad; 412 } 413 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 414 415 /* Initialize the IPCOMP header */ 416 /* XXX alignment always correct? */ 417 switch (sav->sah->saidx.dst.sa.sa_family) { 418 #ifdef INET 419 case AF_INET: 420 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 421 break; 422 #endif /* INET */ 423 #ifdef INET6 424 case AF_INET6: 425 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 426 break; 427 #endif 428 } 429 ipcomp->comp_flags = 0; 430 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 431 432 /* Fix Next Protocol in IPv4/IPv6 header */ 433 prot = IPPROTO_IPCOMP; 434 m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot); 435 436 /* Ok now, we can pass to the crypto processing */ 437 438 /* Get crypto descriptors */ 439 crp = crypto_getreq(1); 440 if (crp == NULL) { 441 ipcompstat.ipcomps_crypto++; 442 DPRINTF(("ipcomp_output: failed to acquire crypto descriptor\n")); 443 error = ENOBUFS; 444 goto bad; 445 } 446 crdc = crp->crp_desc; 447 448 /* Compression descriptor */ 449 crdc->crd_skip = skip + hlen; 450 crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 451 crdc->crd_flags = CRD_F_COMP; 452 crdc->crd_inject = skip + hlen; 453 454 /* Compression operation */ 455 crdc->crd_alg = ipcompx->type; 456 457 /* IPsec-specific opaque crypto info */ 458 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto), 459 M_XDATA, M_NOWAIT|M_ZERO); 460 if (tc == NULL) { 461 ipcompstat.ipcomps_crypto++; 462 DPRINTF(("ipcomp_output: failed to allocate tdb_crypto\n")); 463 crypto_freereq(crp); 464 error = ENOBUFS; 465 goto bad; 466 } 467 468 tc->tc_isr = isr; 469 tc->tc_spi = sav->spi; 470 tc->tc_dst = sav->sah->saidx.dst; 471 tc->tc_proto = sav->sah->saidx.proto; 472 tc->tc_skip = skip + hlen; 473 474 /* Crypto operation descriptor */ 475 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 476 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 477 crp->crp_buf = (caddr_t) m; 478 crp->crp_callback = ipcomp_output_cb; 479 crp->crp_opaque = (caddr_t) tc; 480 crp->crp_sid = sav->tdb_cryptoid; 481 482 return crypto_dispatch(crp); 483 bad: 484 if (m) 485 m_freem(m); 486 return (error); 487 } 488 489 /* 490 * IPComp output callback from the crypto driver. 491 */ 492 static int 493 ipcomp_output_cb(struct cryptop *crp) 494 { 495 struct tdb_crypto *tc; 496 struct ipsecrequest *isr; 497 struct secasvar *sav; 498 struct mbuf *m; 499 int s, error, skip, rlen; 500 501 tc = (struct tdb_crypto *) crp->crp_opaque; 502 KASSERT(tc != NULL, ("ipcomp_output_cb: null opaque data area!")); 503 m = (struct mbuf *) crp->crp_buf; 504 skip = tc->tc_skip; 505 rlen = crp->crp_ilen - skip; 506 507 s = splnet(); 508 509 isr = tc->tc_isr; 510 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi); 511 if (sav == NULL) { 512 ipcompstat.ipcomps_notdb++; 513 DPRINTF(("ipcomp_output_cb: SA expired while in crypto\n")); 514 error = ENOBUFS; /*XXX*/ 515 goto bad; 516 } 517 KASSERT(isr->sav == sav, ("ipcomp_output_cb: SA changed\n")); 518 519 /* Check for crypto errors */ 520 if (crp->crp_etype) { 521 /* Reset session ID */ 522 if (sav->tdb_cryptoid != 0) 523 sav->tdb_cryptoid = crp->crp_sid; 524 525 if (crp->crp_etype == EAGAIN) { 526 KEY_FREESAV(&sav); 527 splx(s); 528 return crypto_dispatch(crp); 529 } 530 ipcompstat.ipcomps_noxform++; 531 DPRINTF(("ipcomp_output_cb: crypto error %d\n", crp->crp_etype)); 532 error = crp->crp_etype; 533 goto bad; 534 } 535 /* Shouldn't happen... */ 536 if (m == NULL) { 537 ipcompstat.ipcomps_crypto++; 538 DPRINTF(("ipcomp_output_cb: bogus return buffer from crypto\n")); 539 error = EINVAL; 540 goto bad; 541 } 542 ipcompstat.ipcomps_hist[sav->alg_comp]++; 543 544 if (rlen > crp->crp_olen) { 545 /* Adjust the length in the IP header */ 546 switch (sav->sah->saidx.dst.sa.sa_family) { 547 #ifdef INET 548 case AF_INET: 549 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 550 break; 551 #endif /* INET */ 552 #ifdef INET6 553 case AF_INET6: 554 mtod(m, struct ip6_hdr *)->ip6_plen = 555 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 556 break; 557 #endif /* INET6 */ 558 default: 559 ipcompstat.ipcomps_nopf++; 560 DPRINTF(("ipcomp_output: unknown/unsupported protocol " 561 "family %d, IPCA %s/%08lx\n", 562 sav->sah->saidx.dst.sa.sa_family, 563 ipsec_address(&sav->sah->saidx.dst), 564 (u_long) ntohl(sav->spi))); 565 error = EPFNOSUPPORT; 566 goto bad; 567 } 568 } else { 569 /* compression was useless, we have lost time */ 570 /* XXX add statistic */ 571 } 572 573 /* Release the crypto descriptor */ 574 free(tc, M_XDATA); 575 crypto_freereq(crp); 576 577 /* NB: m is reclaimed by ipsec_process_done. */ 578 error = ipsec_process_done(m, isr); 579 KEY_FREESAV(&sav); 580 splx(s); 581 return error; 582 bad: 583 if (sav) 584 KEY_FREESAV(&sav); 585 splx(s); 586 if (m) 587 m_freem(m); 588 free(tc, M_XDATA); 589 crypto_freereq(crp); 590 return error; 591 } 592 593 static struct xformsw ipcomp_xformsw = { 594 XF_IPCOMP, XFT_COMP, "IPcomp", 595 ipcomp_init, ipcomp_zeroize, ipcomp_input, 596 ipcomp_output 597 }; 598 599 static void 600 ipcomp_attach(void) 601 { 602 xform_register(&ipcomp_xformsw); 603 } 604 SYSINIT(ipcomp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipcomp_attach, NULL)
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