xform_ipcomp.c revision 119643
1105197Ssam/* $FreeBSD: head/sys/netipsec/xform_ipcomp.c 119643 2003-09-01 05:35:55Z sam $ */ 2105197Ssam/* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */ 3105197Ssam 4105197Ssam/* 5105197Ssam * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org) 6105197Ssam * 7105197Ssam * Redistribution and use in source and binary forms, with or without 8105197Ssam * modification, are permitted provided that the following conditions 9105197Ssam * are met: 10105197Ssam * 11105197Ssam * 1. Redistributions of source code must retain the above copyright 12105197Ssam * notice, this list of conditions and the following disclaimer. 13105197Ssam * 2. Redistributions in binary form must reproduce the above copyright 14105197Ssam * notice, this list of conditions and the following disclaimer in the 15105197Ssam * documentation and/or other materials provided with the distribution. 16105197Ssam * 3. The name of the author may not be used to endorse or promote products 17105197Ssam * derived from this software without specific prior written permission. 18105197Ssam * 19105197Ssam * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20105197Ssam * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21105197Ssam * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22105197Ssam * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23105197Ssam * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24105197Ssam * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25105197Ssam * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26105197Ssam * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27105197Ssam * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28105197Ssam * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29105197Ssam */ 30105197Ssam 31105197Ssam/* IP payload compression protocol (IPComp), see RFC 2393 */ 32105197Ssam#include "opt_inet.h" 33105197Ssam#include "opt_inet6.h" 34105197Ssam 35105197Ssam#include <sys/param.h> 36105197Ssam#include <sys/systm.h> 37105197Ssam#include <sys/mbuf.h> 38119643Ssam#include <sys/lock.h> 39119643Ssam#include <sys/mutex.h> 40105197Ssam#include <sys/socket.h> 41105197Ssam#include <sys/kernel.h> 42105197Ssam#include <sys/protosw.h> 43105197Ssam#include <sys/sysctl.h> 44105197Ssam 45105197Ssam#include <netinet/in.h> 46105197Ssam#include <netinet/in_systm.h> 47105197Ssam#include <netinet/ip.h> 48105197Ssam#include <netinet/ip_var.h> 49105197Ssam 50105197Ssam#include <net/route.h> 51105197Ssam#include <netipsec/ipsec.h> 52105197Ssam#include <netipsec/xform.h> 53105197Ssam 54105197Ssam#ifdef INET6 55105197Ssam#include <netinet/ip6.h> 56105197Ssam#include <netipsec/ipsec6.h> 57105197Ssam#endif 58105197Ssam 59105197Ssam#include <netipsec/ipcomp.h> 60105197Ssam#include <netipsec/ipcomp_var.h> 61105197Ssam 62105197Ssam#include <netipsec/key.h> 63105197Ssam#include <netipsec/key_debug.h> 64105197Ssam 65105197Ssam#include <opencrypto/cryptodev.h> 66105197Ssam#include <opencrypto/deflate.h> 67105197Ssam#include <opencrypto/xform.h> 68105197Ssam 69105197Ssamint ipcomp_enable = 0; 70105197Ssamstruct ipcompstat ipcompstat; 71105197Ssam 72105197SsamSYSCTL_DECL(_net_inet_ipcomp); 73105197SsamSYSCTL_INT(_net_inet_ipcomp, OID_AUTO, 74105197Ssam ipcomp_enable, CTLFLAG_RW, &ipcomp_enable, 0, ""); 75105197SsamSYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS, 76105197Ssam stats, CTLFLAG_RD, &ipcompstat, ipcompstat, ""); 77105197Ssam 78105197Ssamstatic int ipcomp_input_cb(struct cryptop *crp); 79105197Ssamstatic int ipcomp_output_cb(struct cryptop *crp); 80105197Ssam 81105197Ssamstruct comp_algo * 82105197Ssamipcomp_algorithm_lookup(int alg) 83105197Ssam{ 84105197Ssam if (alg >= IPCOMP_ALG_MAX) 85105197Ssam return NULL; 86105197Ssam switch (alg) { 87105197Ssam case SADB_X_CALG_DEFLATE: 88105197Ssam return &comp_algo_deflate; 89105197Ssam } 90105197Ssam return NULL; 91105197Ssam} 92105197Ssam 93105197Ssam/* 94105197Ssam * ipcomp_init() is called when an CPI is being set up. 95105197Ssam */ 96105197Ssamstatic int 97105197Ssamipcomp_init(struct secasvar *sav, struct xformsw *xsp) 98105197Ssam{ 99105197Ssam struct comp_algo *tcomp; 100105197Ssam struct cryptoini cric; 101105197Ssam 102105197Ssam /* NB: algorithm really comes in alg_enc and not alg_comp! */ 103105197Ssam tcomp = ipcomp_algorithm_lookup(sav->alg_enc); 104105197Ssam if (tcomp == NULL) { 105105197Ssam DPRINTF(("ipcomp_init: unsupported compression algorithm %d\n", 106105197Ssam sav->alg_comp)); 107105197Ssam return EINVAL; 108105197Ssam } 109105197Ssam sav->alg_comp = sav->alg_enc; /* set for doing histogram */ 110105197Ssam sav->tdb_xform = xsp; 111105197Ssam sav->tdb_compalgxform = tcomp; 112105197Ssam 113105197Ssam /* Initialize crypto session */ 114105197Ssam bzero(&cric, sizeof (cric)); 115105197Ssam cric.cri_alg = sav->tdb_compalgxform->type; 116105197Ssam 117105197Ssam return crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support); 118105197Ssam} 119105197Ssam 120105197Ssam/* 121105197Ssam * ipcomp_zeroize() used when IPCA is deleted 122105197Ssam */ 123105197Ssamstatic int 124105197Ssamipcomp_zeroize(struct secasvar *sav) 125105197Ssam{ 126105197Ssam int err; 127105197Ssam 128105197Ssam err = crypto_freesession(sav->tdb_cryptoid); 129105197Ssam sav->tdb_cryptoid = 0; 130105197Ssam return err; 131105197Ssam} 132105197Ssam 133105197Ssam/* 134105197Ssam * ipcomp_input() gets called to uncompress an input packet 135105197Ssam */ 136105197Ssamstatic int 137105197Ssamipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 138105197Ssam{ 139105197Ssam struct tdb_crypto *tc; 140105197Ssam struct cryptodesc *crdc; 141105197Ssam struct cryptop *crp; 142105197Ssam int hlen = IPCOMP_HLENGTH; 143105197Ssam 144105197Ssam#if 0 145105197Ssam SPLASSERT(net, "ipcomp_input"); 146105197Ssam#endif 147105197Ssam 148105197Ssam /* Get crypto descriptors */ 149105197Ssam crp = crypto_getreq(1); 150105197Ssam if (crp == NULL) { 151105197Ssam m_freem(m); 152105197Ssam DPRINTF(("ipcomp_input: no crypto descriptors\n")); 153105197Ssam ipcompstat.ipcomps_crypto++; 154105197Ssam return ENOBUFS; 155105197Ssam } 156105197Ssam /* Get IPsec-specific opaque pointer */ 157105197Ssam tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO); 158105197Ssam if (tc == NULL) { 159105197Ssam m_freem(m); 160105197Ssam crypto_freereq(crp); 161105197Ssam DPRINTF(("ipcomp_input: cannot allocate tdb_crypto\n")); 162105197Ssam ipcompstat.ipcomps_crypto++; 163105197Ssam return ENOBUFS; 164105197Ssam } 165105197Ssam crdc = crp->crp_desc; 166105197Ssam 167105197Ssam crdc->crd_skip = skip + hlen; 168105197Ssam crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 169105197Ssam crdc->crd_inject = skip; 170105197Ssam 171105197Ssam tc->tc_ptr = 0; 172105197Ssam 173105197Ssam /* Decompression operation */ 174105197Ssam crdc->crd_alg = sav->tdb_compalgxform->type; 175105197Ssam 176105197Ssam /* Crypto operation descriptor */ 177105197Ssam crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 178117058Ssam crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 179105197Ssam crp->crp_buf = (caddr_t) m; 180105197Ssam crp->crp_callback = ipcomp_input_cb; 181105197Ssam crp->crp_sid = sav->tdb_cryptoid; 182105197Ssam crp->crp_opaque = (caddr_t) tc; 183105197Ssam 184105197Ssam /* These are passed as-is to the callback */ 185105197Ssam tc->tc_spi = sav->spi; 186105197Ssam tc->tc_dst = sav->sah->saidx.dst; 187105197Ssam tc->tc_proto = sav->sah->saidx.proto; 188105197Ssam tc->tc_protoff = protoff; 189105197Ssam tc->tc_skip = skip; 190105197Ssam 191105197Ssam return crypto_dispatch(crp); 192105197Ssam} 193105197Ssam 194105197Ssam#ifdef INET6 195105197Ssam#define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \ 196105197Ssam if (saidx->dst.sa.sa_family == AF_INET6) { \ 197105197Ssam error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \ 198105197Ssam } else { \ 199105197Ssam error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \ 200105197Ssam } \ 201105197Ssam} while (0) 202105197Ssam#else 203105197Ssam#define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \ 204105197Ssam (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag)) 205105197Ssam#endif 206105197Ssam 207105197Ssam/* 208105197Ssam * IPComp input callback from the crypto driver. 209105197Ssam */ 210105197Ssamstatic int 211105197Ssamipcomp_input_cb(struct cryptop *crp) 212105197Ssam{ 213105197Ssam struct cryptodesc *crd; 214105197Ssam struct tdb_crypto *tc; 215105197Ssam int skip, protoff; 216105197Ssam struct mtag *mtag; 217105197Ssam struct mbuf *m; 218105197Ssam struct secasvar *sav; 219105197Ssam struct secasindex *saidx; 220119643Ssam int hlen = IPCOMP_HLENGTH, error, clen; 221105197Ssam u_int8_t nproto; 222105197Ssam caddr_t addr; 223105197Ssam 224105197Ssam crd = crp->crp_desc; 225105197Ssam 226105197Ssam tc = (struct tdb_crypto *) crp->crp_opaque; 227105197Ssam KASSERT(tc != NULL, ("ipcomp_input_cb: null opaque crypto data area!")); 228105197Ssam skip = tc->tc_skip; 229105197Ssam protoff = tc->tc_protoff; 230105197Ssam mtag = (struct mtag *) tc->tc_ptr; 231105197Ssam m = (struct mbuf *) crp->crp_buf; 232105197Ssam 233105197Ssam sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi); 234105197Ssam if (sav == NULL) { 235105197Ssam ipcompstat.ipcomps_notdb++; 236105197Ssam DPRINTF(("ipcomp_input_cb: SA expired while in crypto\n")); 237105197Ssam error = ENOBUFS; /*XXX*/ 238105197Ssam goto bad; 239105197Ssam } 240105197Ssam 241105197Ssam saidx = &sav->sah->saidx; 242105197Ssam KASSERT(saidx->dst.sa.sa_family == AF_INET || 243105197Ssam saidx->dst.sa.sa_family == AF_INET6, 244105197Ssam ("ah_input_cb: unexpected protocol family %u", 245105197Ssam saidx->dst.sa.sa_family)); 246105197Ssam 247105197Ssam /* Check for crypto errors */ 248105197Ssam if (crp->crp_etype) { 249105197Ssam /* Reset the session ID */ 250105197Ssam if (sav->tdb_cryptoid != 0) 251105197Ssam sav->tdb_cryptoid = crp->crp_sid; 252105197Ssam 253105197Ssam if (crp->crp_etype == EAGAIN) { 254105197Ssam KEY_FREESAV(&sav); 255105197Ssam return crypto_dispatch(crp); 256105197Ssam } 257105197Ssam 258105197Ssam ipcompstat.ipcomps_noxform++; 259105197Ssam DPRINTF(("ipcomp_input_cb: crypto error %d\n", crp->crp_etype)); 260105197Ssam error = crp->crp_etype; 261105197Ssam goto bad; 262105197Ssam } 263105197Ssam /* Shouldn't happen... */ 264105197Ssam if (m == NULL) { 265105197Ssam ipcompstat.ipcomps_crypto++; 266105197Ssam DPRINTF(("ipcomp_input_cb: null mbuf returned from crypto\n")); 267105197Ssam error = EINVAL; 268105197Ssam goto bad; 269105197Ssam } 270105197Ssam ipcompstat.ipcomps_hist[sav->alg_comp]++; 271105197Ssam 272105197Ssam clen = crp->crp_olen; /* Length of data after processing */ 273105197Ssam 274105197Ssam /* Release the crypto descriptors */ 275105197Ssam free(tc, M_XDATA), tc = NULL; 276105197Ssam crypto_freereq(crp), crp = NULL; 277105197Ssam 278105197Ssam /* In case it's not done already, adjust the size of the mbuf chain */ 279105197Ssam m->m_pkthdr.len = clen + hlen + skip; 280105197Ssam 281105197Ssam if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { 282105197Ssam ipcompstat.ipcomps_hdrops++; /*XXX*/ 283105197Ssam DPRINTF(("ipcomp_input_cb: m_pullup failed\n")); 284105197Ssam error = EINVAL; /*XXX*/ 285105197Ssam goto bad; 286105197Ssam } 287105197Ssam 288105197Ssam /* Keep the next protocol field */ 289105197Ssam addr = (caddr_t) mtod(m, struct ip *) + skip; 290105197Ssam nproto = ((struct ipcomp *) addr)->comp_nxt; 291105197Ssam 292105197Ssam /* Remove the IPCOMP header */ 293105197Ssam error = m_striphdr(m, skip, hlen); 294105197Ssam if (error) { 295105197Ssam ipcompstat.ipcomps_hdrops++; 296105197Ssam DPRINTF(("ipcomp_input_cb: bad mbuf chain, IPCA %s/%08lx\n", 297105197Ssam ipsec_address(&sav->sah->saidx.dst), 298105197Ssam (u_long) ntohl(sav->spi))); 299105197Ssam goto bad; 300105197Ssam } 301105197Ssam 302105197Ssam /* Restore the Next Protocol field */ 303105197Ssam m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 304105197Ssam 305105197Ssam IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL); 306105197Ssam 307105197Ssam KEY_FREESAV(&sav); 308105197Ssam return error; 309105197Ssambad: 310105197Ssam if (sav) 311105197Ssam KEY_FREESAV(&sav); 312105197Ssam if (m) 313105197Ssam m_freem(m); 314105197Ssam if (tc != NULL) 315105197Ssam free(tc, M_XDATA); 316105197Ssam if (crp) 317105197Ssam crypto_freereq(crp); 318105197Ssam return error; 319105197Ssam} 320105197Ssam 321105197Ssam/* 322105197Ssam * IPComp output routine, called by ipsec[46]_process_packet() 323105197Ssam */ 324105197Ssamstatic int 325105197Ssamipcomp_output( 326105197Ssam struct mbuf *m, 327105197Ssam struct ipsecrequest *isr, 328105197Ssam struct mbuf **mp, 329105197Ssam int skip, 330105197Ssam int protoff 331105197Ssam) 332105197Ssam{ 333105197Ssam struct secasvar *sav; 334105197Ssam struct comp_algo *ipcompx; 335105197Ssam int error, ralen, hlen, maxpacketsize, roff; 336105197Ssam u_int8_t prot; 337105197Ssam struct cryptodesc *crdc; 338105197Ssam struct cryptop *crp; 339105197Ssam struct tdb_crypto *tc; 340105197Ssam struct mbuf *mo; 341105197Ssam struct ipcomp *ipcomp; 342105197Ssam 343105197Ssam#if 0 344105197Ssam SPLASSERT(net, "ipcomp_output"); 345105197Ssam#endif 346105197Ssam 347105197Ssam sav = isr->sav; 348105197Ssam KASSERT(sav != NULL, ("ipcomp_output: null SA")); 349105197Ssam ipcompx = sav->tdb_compalgxform; 350105197Ssam KASSERT(ipcompx != NULL, ("ipcomp_output: null compression xform")); 351105197Ssam 352105197Ssam ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 353105197Ssam hlen = IPCOMP_HLENGTH; 354105197Ssam 355105197Ssam ipcompstat.ipcomps_output++; 356105197Ssam 357105197Ssam /* Check for maximum packet size violations. */ 358105197Ssam switch (sav->sah->saidx.dst.sa.sa_family) { 359105197Ssam#ifdef INET 360105197Ssam case AF_INET: 361105197Ssam maxpacketsize = IP_MAXPACKET; 362105197Ssam break; 363105197Ssam#endif /* INET */ 364105197Ssam#ifdef INET6 365105197Ssam case AF_INET6: 366105197Ssam maxpacketsize = IPV6_MAXPACKET; 367105197Ssam break; 368105197Ssam#endif /* INET6 */ 369105197Ssam default: 370105197Ssam ipcompstat.ipcomps_nopf++; 371105197Ssam DPRINTF(("ipcomp_output: unknown/unsupported protocol family %d" 372105197Ssam ", IPCA %s/%08lx\n", 373105197Ssam sav->sah->saidx.dst.sa.sa_family, 374105197Ssam ipsec_address(&sav->sah->saidx.dst), 375105197Ssam (u_long) ntohl(sav->spi))); 376105197Ssam error = EPFNOSUPPORT; 377105197Ssam goto bad; 378105197Ssam } 379105197Ssam if (skip + hlen + ralen > maxpacketsize) { 380105197Ssam ipcompstat.ipcomps_toobig++; 381105197Ssam DPRINTF(("ipcomp_output: packet in IPCA %s/%08lx got too big " 382105197Ssam "(len %u, max len %u)\n", 383105197Ssam ipsec_address(&sav->sah->saidx.dst), 384105197Ssam (u_long) ntohl(sav->spi), 385105197Ssam skip + hlen + ralen, maxpacketsize)); 386105197Ssam error = EMSGSIZE; 387105197Ssam goto bad; 388105197Ssam } 389105197Ssam 390105197Ssam /* Update the counters */ 391105197Ssam ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip; 392105197Ssam 393105197Ssam m = m_clone(m); 394105197Ssam if (m == NULL) { 395105197Ssam ipcompstat.ipcomps_hdrops++; 396105197Ssam DPRINTF(("ipcomp_output: cannot clone mbuf chain, IPCA %s/%08lx\n", 397105197Ssam ipsec_address(&sav->sah->saidx.dst), 398105197Ssam (u_long) ntohl(sav->spi))); 399105197Ssam error = ENOBUFS; 400105197Ssam goto bad; 401105197Ssam } 402105197Ssam 403105197Ssam /* Inject IPCOMP header */ 404105197Ssam mo = m_makespace(m, skip, hlen, &roff); 405105197Ssam if (mo == NULL) { 406105197Ssam ipcompstat.ipcomps_wrap++; 407105197Ssam DPRINTF(("ipcomp_output: failed to inject IPCOMP header for " 408105197Ssam "IPCA %s/%08lx\n", 409105197Ssam ipsec_address(&sav->sah->saidx.dst), 410105197Ssam (u_long) ntohl(sav->spi))); 411105197Ssam error = ENOBUFS; 412105197Ssam goto bad; 413105197Ssam } 414105197Ssam ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 415105197Ssam 416105197Ssam /* Initialize the IPCOMP header */ 417105197Ssam /* XXX alignment always correct? */ 418105197Ssam switch (sav->sah->saidx.dst.sa.sa_family) { 419105197Ssam#ifdef INET 420105197Ssam case AF_INET: 421105197Ssam ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 422105197Ssam break; 423105197Ssam#endif /* INET */ 424105197Ssam#ifdef INET6 425105197Ssam case AF_INET6: 426105197Ssam ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 427105197Ssam break; 428105197Ssam#endif 429105197Ssam } 430105197Ssam ipcomp->comp_flags = 0; 431105197Ssam ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 432105197Ssam 433105197Ssam /* Fix Next Protocol in IPv4/IPv6 header */ 434105197Ssam prot = IPPROTO_IPCOMP; 435105197Ssam m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot); 436105197Ssam 437105197Ssam /* Ok now, we can pass to the crypto processing */ 438105197Ssam 439105197Ssam /* Get crypto descriptors */ 440105197Ssam crp = crypto_getreq(1); 441105197Ssam if (crp == NULL) { 442105197Ssam ipcompstat.ipcomps_crypto++; 443105197Ssam DPRINTF(("ipcomp_output: failed to acquire crypto descriptor\n")); 444105197Ssam error = ENOBUFS; 445105197Ssam goto bad; 446105197Ssam } 447105197Ssam crdc = crp->crp_desc; 448105197Ssam 449105197Ssam /* Compression descriptor */ 450105197Ssam crdc->crd_skip = skip + hlen; 451105197Ssam crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 452105197Ssam crdc->crd_flags = CRD_F_COMP; 453105197Ssam crdc->crd_inject = skip + hlen; 454105197Ssam 455105197Ssam /* Compression operation */ 456105197Ssam crdc->crd_alg = ipcompx->type; 457105197Ssam 458105197Ssam /* IPsec-specific opaque crypto info */ 459105197Ssam tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto), 460105197Ssam M_XDATA, M_NOWAIT|M_ZERO); 461105197Ssam if (tc == NULL) { 462105197Ssam ipcompstat.ipcomps_crypto++; 463105197Ssam DPRINTF(("ipcomp_output: failed to allocate tdb_crypto\n")); 464105197Ssam crypto_freereq(crp); 465105197Ssam error = ENOBUFS; 466105197Ssam goto bad; 467105197Ssam } 468105197Ssam 469105197Ssam tc->tc_isr = isr; 470105197Ssam tc->tc_spi = sav->spi; 471105197Ssam tc->tc_dst = sav->sah->saidx.dst; 472105197Ssam tc->tc_proto = sav->sah->saidx.proto; 473105197Ssam tc->tc_skip = skip + hlen; 474105197Ssam 475105197Ssam /* Crypto operation descriptor */ 476105197Ssam crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 477117058Ssam crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 478105197Ssam crp->crp_buf = (caddr_t) m; 479105197Ssam crp->crp_callback = ipcomp_output_cb; 480105197Ssam crp->crp_opaque = (caddr_t) tc; 481105197Ssam crp->crp_sid = sav->tdb_cryptoid; 482105197Ssam 483105197Ssam return crypto_dispatch(crp); 484105197Ssambad: 485105197Ssam if (m) 486105197Ssam m_freem(m); 487105197Ssam return (error); 488105197Ssam} 489105197Ssam 490105197Ssam/* 491105197Ssam * IPComp output callback from the crypto driver. 492105197Ssam */ 493105197Ssamstatic int 494105197Ssamipcomp_output_cb(struct cryptop *crp) 495105197Ssam{ 496105197Ssam struct tdb_crypto *tc; 497105197Ssam struct ipsecrequest *isr; 498105197Ssam struct secasvar *sav; 499105197Ssam struct mbuf *m; 500119643Ssam int error, skip, rlen; 501105197Ssam 502105197Ssam tc = (struct tdb_crypto *) crp->crp_opaque; 503105197Ssam KASSERT(tc != NULL, ("ipcomp_output_cb: null opaque data area!")); 504105197Ssam m = (struct mbuf *) crp->crp_buf; 505105197Ssam skip = tc->tc_skip; 506105197Ssam rlen = crp->crp_ilen - skip; 507105197Ssam 508105197Ssam isr = tc->tc_isr; 509119643Ssam mtx_lock(&isr->lock); 510105197Ssam sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi); 511105197Ssam if (sav == NULL) { 512105197Ssam ipcompstat.ipcomps_notdb++; 513105197Ssam DPRINTF(("ipcomp_output_cb: SA expired while in crypto\n")); 514105197Ssam error = ENOBUFS; /*XXX*/ 515105197Ssam goto bad; 516105197Ssam } 517105197Ssam KASSERT(isr->sav == sav, ("ipcomp_output_cb: SA changed\n")); 518105197Ssam 519105197Ssam /* Check for crypto errors */ 520105197Ssam if (crp->crp_etype) { 521105197Ssam /* Reset session ID */ 522105197Ssam if (sav->tdb_cryptoid != 0) 523105197Ssam sav->tdb_cryptoid = crp->crp_sid; 524105197Ssam 525105197Ssam if (crp->crp_etype == EAGAIN) { 526105197Ssam KEY_FREESAV(&sav); 527119643Ssam mtx_unlock(&isr->lock); 528105197Ssam return crypto_dispatch(crp); 529105197Ssam } 530105197Ssam ipcompstat.ipcomps_noxform++; 531105197Ssam DPRINTF(("ipcomp_output_cb: crypto error %d\n", crp->crp_etype)); 532105197Ssam error = crp->crp_etype; 533105197Ssam goto bad; 534105197Ssam } 535105197Ssam /* Shouldn't happen... */ 536105197Ssam if (m == NULL) { 537105197Ssam ipcompstat.ipcomps_crypto++; 538105197Ssam DPRINTF(("ipcomp_output_cb: bogus return buffer from crypto\n")); 539105197Ssam error = EINVAL; 540105197Ssam goto bad; 541105197Ssam } 542105197Ssam ipcompstat.ipcomps_hist[sav->alg_comp]++; 543105197Ssam 544105197Ssam if (rlen > crp->crp_olen) { 545105197Ssam /* Adjust the length in the IP header */ 546105197Ssam switch (sav->sah->saidx.dst.sa.sa_family) { 547105197Ssam#ifdef INET 548105197Ssam case AF_INET: 549105197Ssam mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 550105197Ssam break; 551105197Ssam#endif /* INET */ 552105197Ssam#ifdef INET6 553105197Ssam case AF_INET6: 554105197Ssam mtod(m, struct ip6_hdr *)->ip6_plen = 555105197Ssam htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 556105197Ssam break; 557105197Ssam#endif /* INET6 */ 558105197Ssam default: 559105197Ssam ipcompstat.ipcomps_nopf++; 560105197Ssam DPRINTF(("ipcomp_output: unknown/unsupported protocol " 561105197Ssam "family %d, IPCA %s/%08lx\n", 562105197Ssam sav->sah->saidx.dst.sa.sa_family, 563105197Ssam ipsec_address(&sav->sah->saidx.dst), 564105197Ssam (u_long) ntohl(sav->spi))); 565105197Ssam error = EPFNOSUPPORT; 566105197Ssam goto bad; 567105197Ssam } 568105197Ssam } else { 569105197Ssam /* compression was useless, we have lost time */ 570105197Ssam /* XXX add statistic */ 571105197Ssam } 572105197Ssam 573105197Ssam /* Release the crypto descriptor */ 574105197Ssam free(tc, M_XDATA); 575105197Ssam crypto_freereq(crp); 576105197Ssam 577105197Ssam /* NB: m is reclaimed by ipsec_process_done. */ 578105197Ssam error = ipsec_process_done(m, isr); 579105197Ssam KEY_FREESAV(&sav); 580119643Ssam mtx_unlock(&isr->lock); 581119643Ssam 582105197Ssam return error; 583105197Ssambad: 584105197Ssam if (sav) 585105197Ssam KEY_FREESAV(&sav); 586119643Ssam mtx_unlock(&isr->lock); 587105197Ssam if (m) 588105197Ssam m_freem(m); 589105197Ssam free(tc, M_XDATA); 590105197Ssam crypto_freereq(crp); 591105197Ssam return error; 592105197Ssam} 593105197Ssam 594105197Ssamstatic struct xformsw ipcomp_xformsw = { 595105197Ssam XF_IPCOMP, XFT_COMP, "IPcomp", 596105197Ssam ipcomp_init, ipcomp_zeroize, ipcomp_input, 597105197Ssam ipcomp_output 598105197Ssam}; 599105197Ssam 600105197Ssamstatic void 601105197Ssamipcomp_attach(void) 602105197Ssam{ 603105197Ssam xform_register(&ipcomp_xformsw); 604105197Ssam} 605105197SsamSYSINIT(ipcomp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipcomp_attach, NULL) 606