xform_ipcomp.c revision 156756
1105197Ssam/* $FreeBSD: head/sys/netipsec/xform_ipcomp.c 156756 2006-03-15 21:11:11Z sam $ */ 2105197Ssam/* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */ 3105197Ssam 4139823Simp/*- 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) { 105120585Ssam DPRINTF(("%s: unsupported compression algorithm %d\n", __func__, 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 144120585Ssam IPSEC_SPLASSERT_SOFTNET(__func__); 145105197Ssam 146105197Ssam /* Get crypto descriptors */ 147105197Ssam crp = crypto_getreq(1); 148105197Ssam if (crp == NULL) { 149105197Ssam m_freem(m); 150120585Ssam DPRINTF(("%s: no crypto descriptors\n", __func__)); 151105197Ssam ipcompstat.ipcomps_crypto++; 152105197Ssam return ENOBUFS; 153105197Ssam } 154105197Ssam /* Get IPsec-specific opaque pointer */ 155105197Ssam tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO); 156105197Ssam if (tc == NULL) { 157105197Ssam m_freem(m); 158105197Ssam crypto_freereq(crp); 159120585Ssam DPRINTF(("%s: cannot allocate tdb_crypto\n", __func__)); 160105197Ssam ipcompstat.ipcomps_crypto++; 161105197Ssam return ENOBUFS; 162105197Ssam } 163105197Ssam crdc = crp->crp_desc; 164105197Ssam 165105197Ssam crdc->crd_skip = skip + hlen; 166105197Ssam crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 167105197Ssam crdc->crd_inject = skip; 168105197Ssam 169105197Ssam tc->tc_ptr = 0; 170105197Ssam 171105197Ssam /* Decompression operation */ 172105197Ssam crdc->crd_alg = sav->tdb_compalgxform->type; 173105197Ssam 174105197Ssam /* Crypto operation descriptor */ 175105197Ssam crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 176117058Ssam crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 177105197Ssam crp->crp_buf = (caddr_t) m; 178105197Ssam crp->crp_callback = ipcomp_input_cb; 179105197Ssam crp->crp_sid = sav->tdb_cryptoid; 180105197Ssam crp->crp_opaque = (caddr_t) tc; 181105197Ssam 182105197Ssam /* These are passed as-is to the callback */ 183105197Ssam tc->tc_spi = sav->spi; 184105197Ssam tc->tc_dst = sav->sah->saidx.dst; 185105197Ssam tc->tc_proto = sav->sah->saidx.proto; 186105197Ssam tc->tc_protoff = protoff; 187105197Ssam tc->tc_skip = skip; 188105197Ssam 189105197Ssam return crypto_dispatch(crp); 190105197Ssam} 191105197Ssam 192105197Ssam#ifdef INET6 193105197Ssam#define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \ 194105197Ssam if (saidx->dst.sa.sa_family == AF_INET6) { \ 195105197Ssam error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \ 196105197Ssam } else { \ 197105197Ssam error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \ 198105197Ssam } \ 199105197Ssam} while (0) 200105197Ssam#else 201105197Ssam#define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \ 202105197Ssam (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag)) 203105197Ssam#endif 204105197Ssam 205105197Ssam/* 206105197Ssam * IPComp input callback from the crypto driver. 207105197Ssam */ 208105197Ssamstatic int 209105197Ssamipcomp_input_cb(struct cryptop *crp) 210105197Ssam{ 211105197Ssam struct cryptodesc *crd; 212105197Ssam struct tdb_crypto *tc; 213105197Ssam int skip, protoff; 214105197Ssam struct mtag *mtag; 215105197Ssam struct mbuf *m; 216105197Ssam struct secasvar *sav; 217105197Ssam struct secasindex *saidx; 218119643Ssam int hlen = IPCOMP_HLENGTH, error, clen; 219105197Ssam u_int8_t nproto; 220105197Ssam caddr_t addr; 221105197Ssam 222105197Ssam crd = crp->crp_desc; 223105197Ssam 224105197Ssam tc = (struct tdb_crypto *) crp->crp_opaque; 225120585Ssam IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!")); 226105197Ssam skip = tc->tc_skip; 227105197Ssam protoff = tc->tc_protoff; 228105197Ssam mtag = (struct mtag *) tc->tc_ptr; 229105197Ssam m = (struct mbuf *) crp->crp_buf; 230105197Ssam 231105197Ssam sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi); 232105197Ssam if (sav == NULL) { 233105197Ssam ipcompstat.ipcomps_notdb++; 234120585Ssam DPRINTF(("%s: SA expired while in crypto\n", __func__)); 235105197Ssam error = ENOBUFS; /*XXX*/ 236105197Ssam goto bad; 237105197Ssam } 238105197Ssam 239105197Ssam saidx = &sav->sah->saidx; 240120585Ssam IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 241105197Ssam saidx->dst.sa.sa_family == AF_INET6, 242120585Ssam ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 243105197Ssam 244105197Ssam /* Check for crypto errors */ 245105197Ssam if (crp->crp_etype) { 246105197Ssam /* Reset the session ID */ 247105197Ssam if (sav->tdb_cryptoid != 0) 248105197Ssam sav->tdb_cryptoid = crp->crp_sid; 249105197Ssam 250105197Ssam if (crp->crp_etype == EAGAIN) { 251105197Ssam KEY_FREESAV(&sav); 252105197Ssam return crypto_dispatch(crp); 253105197Ssam } 254105197Ssam 255105197Ssam ipcompstat.ipcomps_noxform++; 256120585Ssam DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 257105197Ssam error = crp->crp_etype; 258105197Ssam goto bad; 259105197Ssam } 260105197Ssam /* Shouldn't happen... */ 261105197Ssam if (m == NULL) { 262105197Ssam ipcompstat.ipcomps_crypto++; 263120585Ssam DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 264105197Ssam error = EINVAL; 265105197Ssam goto bad; 266105197Ssam } 267105197Ssam ipcompstat.ipcomps_hist[sav->alg_comp]++; 268105197Ssam 269105197Ssam clen = crp->crp_olen; /* Length of data after processing */ 270105197Ssam 271105197Ssam /* Release the crypto descriptors */ 272105197Ssam free(tc, M_XDATA), tc = NULL; 273105197Ssam crypto_freereq(crp), crp = NULL; 274105197Ssam 275105197Ssam /* In case it's not done already, adjust the size of the mbuf chain */ 276105197Ssam m->m_pkthdr.len = clen + hlen + skip; 277105197Ssam 278105197Ssam if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { 279105197Ssam ipcompstat.ipcomps_hdrops++; /*XXX*/ 280120585Ssam DPRINTF(("%s: m_pullup failed\n", __func__)); 281105197Ssam error = EINVAL; /*XXX*/ 282105197Ssam goto bad; 283105197Ssam } 284105197Ssam 285105197Ssam /* Keep the next protocol field */ 286105197Ssam addr = (caddr_t) mtod(m, struct ip *) + skip; 287105197Ssam nproto = ((struct ipcomp *) addr)->comp_nxt; 288105197Ssam 289105197Ssam /* Remove the IPCOMP header */ 290105197Ssam error = m_striphdr(m, skip, hlen); 291105197Ssam if (error) { 292105197Ssam ipcompstat.ipcomps_hdrops++; 293120585Ssam DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 294105197Ssam ipsec_address(&sav->sah->saidx.dst), 295105197Ssam (u_long) ntohl(sav->spi))); 296105197Ssam goto bad; 297105197Ssam } 298105197Ssam 299105197Ssam /* Restore the Next Protocol field */ 300105197Ssam m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 301105197Ssam 302105197Ssam IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL); 303105197Ssam 304105197Ssam KEY_FREESAV(&sav); 305105197Ssam return error; 306105197Ssambad: 307105197Ssam if (sav) 308105197Ssam KEY_FREESAV(&sav); 309105197Ssam if (m) 310105197Ssam m_freem(m); 311105197Ssam if (tc != NULL) 312105197Ssam free(tc, M_XDATA); 313105197Ssam if (crp) 314105197Ssam crypto_freereq(crp); 315105197Ssam return error; 316105197Ssam} 317105197Ssam 318105197Ssam/* 319105197Ssam * IPComp output routine, called by ipsec[46]_process_packet() 320105197Ssam */ 321105197Ssamstatic int 322105197Ssamipcomp_output( 323105197Ssam struct mbuf *m, 324105197Ssam struct ipsecrequest *isr, 325105197Ssam struct mbuf **mp, 326105197Ssam int skip, 327105197Ssam int protoff 328105197Ssam) 329105197Ssam{ 330105197Ssam struct secasvar *sav; 331105197Ssam struct comp_algo *ipcompx; 332105197Ssam int error, ralen, hlen, maxpacketsize, roff; 333105197Ssam u_int8_t prot; 334105197Ssam struct cryptodesc *crdc; 335105197Ssam struct cryptop *crp; 336105197Ssam struct tdb_crypto *tc; 337105197Ssam struct mbuf *mo; 338105197Ssam struct ipcomp *ipcomp; 339105197Ssam 340120585Ssam IPSEC_SPLASSERT_SOFTNET(__func__); 341105197Ssam 342105197Ssam sav = isr->sav; 343120585Ssam IPSEC_ASSERT(sav != NULL, ("null SA")); 344105197Ssam ipcompx = sav->tdb_compalgxform; 345120585Ssam IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 346105197Ssam 347105197Ssam ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 348105197Ssam hlen = IPCOMP_HLENGTH; 349105197Ssam 350105197Ssam ipcompstat.ipcomps_output++; 351105197Ssam 352105197Ssam /* Check for maximum packet size violations. */ 353105197Ssam switch (sav->sah->saidx.dst.sa.sa_family) { 354105197Ssam#ifdef INET 355105197Ssam case AF_INET: 356105197Ssam maxpacketsize = IP_MAXPACKET; 357105197Ssam break; 358105197Ssam#endif /* INET */ 359105197Ssam#ifdef INET6 360105197Ssam case AF_INET6: 361105197Ssam maxpacketsize = IPV6_MAXPACKET; 362105197Ssam break; 363105197Ssam#endif /* INET6 */ 364105197Ssam default: 365105197Ssam ipcompstat.ipcomps_nopf++; 366120585Ssam DPRINTF(("%s: unknown/unsupported protocol family %d, " 367120585Ssam "IPCA %s/%08lx\n", __func__, 368105197Ssam sav->sah->saidx.dst.sa.sa_family, 369105197Ssam ipsec_address(&sav->sah->saidx.dst), 370105197Ssam (u_long) ntohl(sav->spi))); 371105197Ssam error = EPFNOSUPPORT; 372105197Ssam goto bad; 373105197Ssam } 374105197Ssam if (skip + hlen + ralen > maxpacketsize) { 375105197Ssam ipcompstat.ipcomps_toobig++; 376120585Ssam DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 377120585Ssam "(len %u, max len %u)\n", __func__, 378105197Ssam ipsec_address(&sav->sah->saidx.dst), 379105197Ssam (u_long) ntohl(sav->spi), 380105197Ssam skip + hlen + ralen, maxpacketsize)); 381105197Ssam error = EMSGSIZE; 382105197Ssam goto bad; 383105197Ssam } 384105197Ssam 385105197Ssam /* Update the counters */ 386105197Ssam ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip; 387105197Ssam 388156756Ssam m = m_unshare(m, M_NOWAIT); 389105197Ssam if (m == NULL) { 390105197Ssam ipcompstat.ipcomps_hdrops++; 391120585Ssam DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 392120585Ssam __func__, ipsec_address(&sav->sah->saidx.dst), 393105197Ssam (u_long) ntohl(sav->spi))); 394105197Ssam error = ENOBUFS; 395105197Ssam goto bad; 396105197Ssam } 397105197Ssam 398105197Ssam /* Inject IPCOMP header */ 399105197Ssam mo = m_makespace(m, skip, hlen, &roff); 400105197Ssam if (mo == NULL) { 401105197Ssam ipcompstat.ipcomps_wrap++; 402120585Ssam DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n", 403120585Ssam __func__, ipsec_address(&sav->sah->saidx.dst), 404105197Ssam (u_long) ntohl(sav->spi))); 405105197Ssam error = ENOBUFS; 406105197Ssam goto bad; 407105197Ssam } 408105197Ssam ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 409105197Ssam 410105197Ssam /* Initialize the IPCOMP header */ 411105197Ssam /* XXX alignment always correct? */ 412105197Ssam switch (sav->sah->saidx.dst.sa.sa_family) { 413105197Ssam#ifdef INET 414105197Ssam case AF_INET: 415105197Ssam ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 416105197Ssam break; 417105197Ssam#endif /* INET */ 418105197Ssam#ifdef INET6 419105197Ssam case AF_INET6: 420105197Ssam ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 421105197Ssam break; 422105197Ssam#endif 423105197Ssam } 424105197Ssam ipcomp->comp_flags = 0; 425105197Ssam ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 426105197Ssam 427105197Ssam /* Fix Next Protocol in IPv4/IPv6 header */ 428105197Ssam prot = IPPROTO_IPCOMP; 429105197Ssam m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot); 430105197Ssam 431105197Ssam /* Ok now, we can pass to the crypto processing */ 432105197Ssam 433105197Ssam /* Get crypto descriptors */ 434105197Ssam crp = crypto_getreq(1); 435105197Ssam if (crp == NULL) { 436105197Ssam ipcompstat.ipcomps_crypto++; 437120585Ssam DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 438105197Ssam error = ENOBUFS; 439105197Ssam goto bad; 440105197Ssam } 441105197Ssam crdc = crp->crp_desc; 442105197Ssam 443105197Ssam /* Compression descriptor */ 444105197Ssam crdc->crd_skip = skip + hlen; 445105197Ssam crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 446105197Ssam crdc->crd_flags = CRD_F_COMP; 447105197Ssam crdc->crd_inject = skip + hlen; 448105197Ssam 449105197Ssam /* Compression operation */ 450105197Ssam crdc->crd_alg = ipcompx->type; 451105197Ssam 452105197Ssam /* IPsec-specific opaque crypto info */ 453105197Ssam tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto), 454105197Ssam M_XDATA, M_NOWAIT|M_ZERO); 455105197Ssam if (tc == NULL) { 456105197Ssam ipcompstat.ipcomps_crypto++; 457120585Ssam DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__)); 458105197Ssam crypto_freereq(crp); 459105197Ssam error = ENOBUFS; 460105197Ssam goto bad; 461105197Ssam } 462105197Ssam 463105197Ssam tc->tc_isr = isr; 464105197Ssam tc->tc_spi = sav->spi; 465105197Ssam tc->tc_dst = sav->sah->saidx.dst; 466105197Ssam tc->tc_proto = sav->sah->saidx.proto; 467105197Ssam tc->tc_skip = skip + hlen; 468105197Ssam 469105197Ssam /* Crypto operation descriptor */ 470105197Ssam crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 471117058Ssam crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 472105197Ssam crp->crp_buf = (caddr_t) m; 473105197Ssam crp->crp_callback = ipcomp_output_cb; 474105197Ssam crp->crp_opaque = (caddr_t) tc; 475105197Ssam crp->crp_sid = sav->tdb_cryptoid; 476105197Ssam 477105197Ssam return crypto_dispatch(crp); 478105197Ssambad: 479105197Ssam if (m) 480105197Ssam m_freem(m); 481105197Ssam return (error); 482105197Ssam} 483105197Ssam 484105197Ssam/* 485105197Ssam * IPComp output callback from the crypto driver. 486105197Ssam */ 487105197Ssamstatic int 488105197Ssamipcomp_output_cb(struct cryptop *crp) 489105197Ssam{ 490105197Ssam struct tdb_crypto *tc; 491105197Ssam struct ipsecrequest *isr; 492105197Ssam struct secasvar *sav; 493105197Ssam struct mbuf *m; 494119643Ssam int error, skip, rlen; 495105197Ssam 496105197Ssam tc = (struct tdb_crypto *) crp->crp_opaque; 497120585Ssam IPSEC_ASSERT(tc != NULL, ("null opaque data area!")); 498105197Ssam m = (struct mbuf *) crp->crp_buf; 499105197Ssam skip = tc->tc_skip; 500105197Ssam rlen = crp->crp_ilen - skip; 501105197Ssam 502105197Ssam isr = tc->tc_isr; 503120585Ssam IPSECREQUEST_LOCK(isr); 504105197Ssam sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi); 505105197Ssam if (sav == NULL) { 506105197Ssam ipcompstat.ipcomps_notdb++; 507120585Ssam DPRINTF(("%s: SA expired while in crypto\n", __func__)); 508105197Ssam error = ENOBUFS; /*XXX*/ 509105197Ssam goto bad; 510105197Ssam } 511120585Ssam IPSEC_ASSERT(isr->sav == sav, ("SA changed\n")); 512105197Ssam 513105197Ssam /* Check for crypto errors */ 514105197Ssam if (crp->crp_etype) { 515105197Ssam /* Reset session ID */ 516105197Ssam if (sav->tdb_cryptoid != 0) 517105197Ssam sav->tdb_cryptoid = crp->crp_sid; 518105197Ssam 519105197Ssam if (crp->crp_etype == EAGAIN) { 520105197Ssam KEY_FREESAV(&sav); 521120585Ssam IPSECREQUEST_UNLOCK(isr); 522105197Ssam return crypto_dispatch(crp); 523105197Ssam } 524105197Ssam ipcompstat.ipcomps_noxform++; 525120585Ssam DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 526105197Ssam error = crp->crp_etype; 527105197Ssam goto bad; 528105197Ssam } 529105197Ssam /* Shouldn't happen... */ 530105197Ssam if (m == NULL) { 531105197Ssam ipcompstat.ipcomps_crypto++; 532120585Ssam DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 533105197Ssam error = EINVAL; 534105197Ssam goto bad; 535105197Ssam } 536105197Ssam ipcompstat.ipcomps_hist[sav->alg_comp]++; 537105197Ssam 538105197Ssam if (rlen > crp->crp_olen) { 539105197Ssam /* Adjust the length in the IP header */ 540105197Ssam switch (sav->sah->saidx.dst.sa.sa_family) { 541105197Ssam#ifdef INET 542105197Ssam case AF_INET: 543105197Ssam mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 544105197Ssam break; 545105197Ssam#endif /* INET */ 546105197Ssam#ifdef INET6 547105197Ssam case AF_INET6: 548105197Ssam mtod(m, struct ip6_hdr *)->ip6_plen = 549105197Ssam htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 550105197Ssam break; 551105197Ssam#endif /* INET6 */ 552105197Ssam default: 553105197Ssam ipcompstat.ipcomps_nopf++; 554120585Ssam DPRINTF(("%s: unknown/unsupported protocol " 555120585Ssam "family %d, IPCA %s/%08lx\n", __func__, 556105197Ssam sav->sah->saidx.dst.sa.sa_family, 557105197Ssam ipsec_address(&sav->sah->saidx.dst), 558105197Ssam (u_long) ntohl(sav->spi))); 559105197Ssam error = EPFNOSUPPORT; 560105197Ssam goto bad; 561105197Ssam } 562105197Ssam } else { 563105197Ssam /* compression was useless, we have lost time */ 564105197Ssam /* XXX add statistic */ 565105197Ssam } 566105197Ssam 567105197Ssam /* Release the crypto descriptor */ 568105197Ssam free(tc, M_XDATA); 569105197Ssam crypto_freereq(crp); 570105197Ssam 571105197Ssam /* NB: m is reclaimed by ipsec_process_done. */ 572105197Ssam error = ipsec_process_done(m, isr); 573105197Ssam KEY_FREESAV(&sav); 574120585Ssam IPSECREQUEST_UNLOCK(isr); 575119643Ssam 576105197Ssam return error; 577105197Ssambad: 578105197Ssam if (sav) 579105197Ssam KEY_FREESAV(&sav); 580120585Ssam IPSECREQUEST_UNLOCK(isr); 581105197Ssam if (m) 582105197Ssam m_freem(m); 583105197Ssam free(tc, M_XDATA); 584105197Ssam crypto_freereq(crp); 585105197Ssam return error; 586105197Ssam} 587105197Ssam 588105197Ssamstatic struct xformsw ipcomp_xformsw = { 589105197Ssam XF_IPCOMP, XFT_COMP, "IPcomp", 590105197Ssam ipcomp_init, ipcomp_zeroize, ipcomp_input, 591105197Ssam ipcomp_output 592105197Ssam}; 593105197Ssam 594105197Ssamstatic void 595105197Ssamipcomp_attach(void) 596105197Ssam{ 597105197Ssam xform_register(&ipcomp_xformsw); 598105197Ssam} 599125099SsamSYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL); 600