xform_ipcomp.c revision 220206
1105197Ssam/* $FreeBSD: head/sys/netipsec/xform_ipcomp.c 220206 2011-03-31 15:23:32Z fabient $ */ 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> 40220206Sfabient#include <sys/rwlock.h> 41105197Ssam#include <sys/socket.h> 42105197Ssam#include <sys/kernel.h> 43105197Ssam#include <sys/protosw.h> 44105197Ssam#include <sys/sysctl.h> 45105197Ssam 46105197Ssam#include <netinet/in.h> 47105197Ssam#include <netinet/in_systm.h> 48105197Ssam#include <netinet/ip.h> 49105197Ssam#include <netinet/ip_var.h> 50105197Ssam 51105197Ssam#include <net/route.h> 52195699Srwatson#include <net/vnet.h> 53195699Srwatson 54105197Ssam#include <netipsec/ipsec.h> 55105197Ssam#include <netipsec/xform.h> 56105197Ssam 57105197Ssam#ifdef INET6 58105197Ssam#include <netinet/ip6.h> 59105197Ssam#include <netipsec/ipsec6.h> 60105197Ssam#endif 61105197Ssam 62105197Ssam#include <netipsec/ipcomp.h> 63105197Ssam#include <netipsec/ipcomp_var.h> 64105197Ssam 65105197Ssam#include <netipsec/key.h> 66105197Ssam#include <netipsec/key_debug.h> 67105197Ssam 68105197Ssam#include <opencrypto/cryptodev.h> 69105197Ssam#include <opencrypto/deflate.h> 70105197Ssam#include <opencrypto/xform.h> 71105197Ssam 72199947SbzVNET_DEFINE(int, ipcomp_enable) = 1; 73195699SrwatsonVNET_DEFINE(struct ipcompstat, ipcompstat); 74105197Ssam 75105197SsamSYSCTL_DECL(_net_inet_ipcomp); 76195699SrwatsonSYSCTL_VNET_INT(_net_inet_ipcomp, OID_AUTO, 77195699Srwatson ipcomp_enable, CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, ""); 78195699SrwatsonSYSCTL_VNET_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS, 79195699Srwatson stats, CTLFLAG_RD, &VNET_NAME(ipcompstat), ipcompstat, ""); 80105197Ssam 81105197Ssamstatic int ipcomp_input_cb(struct cryptop *crp); 82105197Ssamstatic int ipcomp_output_cb(struct cryptop *crp); 83105197Ssam 84105197Ssamstruct comp_algo * 85105197Ssamipcomp_algorithm_lookup(int alg) 86105197Ssam{ 87105197Ssam if (alg >= IPCOMP_ALG_MAX) 88105197Ssam return NULL; 89105197Ssam switch (alg) { 90105197Ssam case SADB_X_CALG_DEFLATE: 91105197Ssam return &comp_algo_deflate; 92105197Ssam } 93105197Ssam return NULL; 94105197Ssam} 95105197Ssam 96105197Ssam/* 97105197Ssam * ipcomp_init() is called when an CPI is being set up. 98105197Ssam */ 99105197Ssamstatic int 100105197Ssamipcomp_init(struct secasvar *sav, struct xformsw *xsp) 101105197Ssam{ 102105197Ssam struct comp_algo *tcomp; 103105197Ssam struct cryptoini cric; 104105197Ssam 105105197Ssam /* NB: algorithm really comes in alg_enc and not alg_comp! */ 106105197Ssam tcomp = ipcomp_algorithm_lookup(sav->alg_enc); 107105197Ssam if (tcomp == NULL) { 108120585Ssam DPRINTF(("%s: unsupported compression algorithm %d\n", __func__, 109105197Ssam sav->alg_comp)); 110105197Ssam return EINVAL; 111105197Ssam } 112105197Ssam sav->alg_comp = sav->alg_enc; /* set for doing histogram */ 113105197Ssam sav->tdb_xform = xsp; 114105197Ssam sav->tdb_compalgxform = tcomp; 115105197Ssam 116105197Ssam /* Initialize crypto session */ 117105197Ssam bzero(&cric, sizeof (cric)); 118105197Ssam cric.cri_alg = sav->tdb_compalgxform->type; 119105197Ssam 120181803Sbz return crypto_newsession(&sav->tdb_cryptoid, &cric, V_crypto_support); 121105197Ssam} 122105197Ssam 123105197Ssam/* 124105197Ssam * ipcomp_zeroize() used when IPCA is deleted 125105197Ssam */ 126105197Ssamstatic int 127105197Ssamipcomp_zeroize(struct secasvar *sav) 128105197Ssam{ 129105197Ssam int err; 130105197Ssam 131105197Ssam err = crypto_freesession(sav->tdb_cryptoid); 132105197Ssam sav->tdb_cryptoid = 0; 133105197Ssam return err; 134105197Ssam} 135105197Ssam 136105197Ssam/* 137105197Ssam * ipcomp_input() gets called to uncompress an input packet 138105197Ssam */ 139105197Ssamstatic int 140105197Ssamipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 141105197Ssam{ 142105197Ssam struct tdb_crypto *tc; 143105197Ssam struct cryptodesc *crdc; 144105197Ssam struct cryptop *crp; 145105197Ssam int hlen = IPCOMP_HLENGTH; 146105197Ssam 147105197Ssam /* Get crypto descriptors */ 148105197Ssam crp = crypto_getreq(1); 149105197Ssam if (crp == NULL) { 150105197Ssam m_freem(m); 151120585Ssam DPRINTF(("%s: no crypto descriptors\n", __func__)); 152181803Sbz V_ipcompstat.ipcomps_crypto++; 153105197Ssam return ENOBUFS; 154105197Ssam } 155105197Ssam /* Get IPsec-specific opaque pointer */ 156105197Ssam tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO); 157105197Ssam if (tc == NULL) { 158105197Ssam m_freem(m); 159105197Ssam crypto_freereq(crp); 160120585Ssam DPRINTF(("%s: cannot allocate tdb_crypto\n", __func__)); 161181803Sbz V_ipcompstat.ipcomps_crypto++; 162105197Ssam return ENOBUFS; 163105197Ssam } 164105197Ssam crdc = crp->crp_desc; 165105197Ssam 166105197Ssam crdc->crd_skip = skip + hlen; 167105197Ssam crdc->crd_len = m->m_pkthdr.len - (skip + hlen); 168105197Ssam crdc->crd_inject = skip; 169105197Ssam 170105197Ssam tc->tc_ptr = 0; 171105197Ssam 172105197Ssam /* Decompression operation */ 173105197Ssam crdc->crd_alg = sav->tdb_compalgxform->type; 174105197Ssam 175105197Ssam /* Crypto operation descriptor */ 176105197Ssam crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); 177117058Ssam crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 178105197Ssam crp->crp_buf = (caddr_t) m; 179105197Ssam crp->crp_callback = ipcomp_input_cb; 180105197Ssam crp->crp_sid = sav->tdb_cryptoid; 181105197Ssam crp->crp_opaque = (caddr_t) tc; 182105197Ssam 183105197Ssam /* These are passed as-is to the callback */ 184105197Ssam tc->tc_spi = sav->spi; 185105197Ssam tc->tc_dst = sav->sah->saidx.dst; 186105197Ssam tc->tc_proto = sav->sah->saidx.proto; 187105197Ssam tc->tc_protoff = protoff; 188105197Ssam tc->tc_skip = skip; 189220206Sfabient KEY_ADDREFSA(sav); 190220206Sfabient tc->tc_sav = sav; 191105197Ssam 192105197Ssam return crypto_dispatch(crp); 193105197Ssam} 194105197Ssam 195105197Ssam#ifdef INET6 196105197Ssam#define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \ 197105197Ssam if (saidx->dst.sa.sa_family == AF_INET6) { \ 198105197Ssam error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \ 199105197Ssam } else { \ 200105197Ssam error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \ 201105197Ssam } \ 202105197Ssam} while (0) 203105197Ssam#else 204105197Ssam#define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \ 205105197Ssam (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag)) 206105197Ssam#endif 207105197Ssam 208105197Ssam/* 209105197Ssam * IPComp input callback from the crypto driver. 210105197Ssam */ 211105197Ssamstatic int 212105197Ssamipcomp_input_cb(struct cryptop *crp) 213105197Ssam{ 214105197Ssam struct cryptodesc *crd; 215105197Ssam struct tdb_crypto *tc; 216105197Ssam int skip, protoff; 217105197Ssam struct mtag *mtag; 218105197Ssam struct mbuf *m; 219105197Ssam struct secasvar *sav; 220105197Ssam struct secasindex *saidx; 221119643Ssam int hlen = IPCOMP_HLENGTH, error, clen; 222105197Ssam u_int8_t nproto; 223105197Ssam caddr_t addr; 224105197Ssam 225105197Ssam crd = crp->crp_desc; 226105197Ssam 227105197Ssam tc = (struct tdb_crypto *) crp->crp_opaque; 228120585Ssam IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!")); 229105197Ssam skip = tc->tc_skip; 230105197Ssam protoff = tc->tc_protoff; 231105197Ssam mtag = (struct mtag *) tc->tc_ptr; 232105197Ssam m = (struct mbuf *) crp->crp_buf; 233105197Ssam 234220206Sfabient sav = tc->tc_sav; 235220206Sfabient IPSEC_ASSERT(sav != NULL, ("null SA!")); 236105197Ssam 237105197Ssam saidx = &sav->sah->saidx; 238120585Ssam IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 239105197Ssam saidx->dst.sa.sa_family == AF_INET6, 240120585Ssam ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 241105197Ssam 242105197Ssam /* Check for crypto errors */ 243105197Ssam if (crp->crp_etype) { 244105197Ssam /* Reset the session ID */ 245105197Ssam if (sav->tdb_cryptoid != 0) 246105197Ssam sav->tdb_cryptoid = crp->crp_sid; 247105197Ssam 248105197Ssam if (crp->crp_etype == EAGAIN) { 249199905Sbz return crypto_dispatch(crp); 250105197Ssam } 251181803Sbz V_ipcompstat.ipcomps_noxform++; 252120585Ssam DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 253105197Ssam error = crp->crp_etype; 254105197Ssam goto bad; 255105197Ssam } 256105197Ssam /* Shouldn't happen... */ 257105197Ssam if (m == NULL) { 258181803Sbz V_ipcompstat.ipcomps_crypto++; 259120585Ssam DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 260105197Ssam error = EINVAL; 261105197Ssam goto bad; 262105197Ssam } 263181803Sbz V_ipcompstat.ipcomps_hist[sav->alg_comp]++; 264105197Ssam 265105197Ssam clen = crp->crp_olen; /* Length of data after processing */ 266105197Ssam 267105197Ssam /* Release the crypto descriptors */ 268105197Ssam free(tc, M_XDATA), tc = NULL; 269105197Ssam crypto_freereq(crp), crp = NULL; 270105197Ssam 271105197Ssam /* In case it's not done already, adjust the size of the mbuf chain */ 272105197Ssam m->m_pkthdr.len = clen + hlen + skip; 273105197Ssam 274105197Ssam if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { 275181803Sbz V_ipcompstat.ipcomps_hdrops++; /*XXX*/ 276120585Ssam DPRINTF(("%s: m_pullup failed\n", __func__)); 277105197Ssam error = EINVAL; /*XXX*/ 278105197Ssam goto bad; 279105197Ssam } 280105197Ssam 281105197Ssam /* Keep the next protocol field */ 282105197Ssam addr = (caddr_t) mtod(m, struct ip *) + skip; 283105197Ssam nproto = ((struct ipcomp *) addr)->comp_nxt; 284105197Ssam 285105197Ssam /* Remove the IPCOMP header */ 286105197Ssam error = m_striphdr(m, skip, hlen); 287105197Ssam if (error) { 288181803Sbz V_ipcompstat.ipcomps_hdrops++; 289120585Ssam DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 290105197Ssam ipsec_address(&sav->sah->saidx.dst), 291105197Ssam (u_long) ntohl(sav->spi))); 292105197Ssam goto bad; 293105197Ssam } 294105197Ssam 295105197Ssam /* Restore the Next Protocol field */ 296105197Ssam m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 297105197Ssam 298105197Ssam IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL); 299105197Ssam 300105197Ssam KEY_FREESAV(&sav); 301105197Ssam return error; 302105197Ssambad: 303105197Ssam if (sav) 304105197Ssam KEY_FREESAV(&sav); 305105197Ssam if (m) 306105197Ssam m_freem(m); 307105197Ssam if (tc != NULL) 308105197Ssam free(tc, M_XDATA); 309105197Ssam if (crp) 310105197Ssam crypto_freereq(crp); 311105197Ssam return error; 312105197Ssam} 313105197Ssam 314105197Ssam/* 315105197Ssam * IPComp output routine, called by ipsec[46]_process_packet() 316105197Ssam */ 317105197Ssamstatic int 318105197Ssamipcomp_output( 319105197Ssam struct mbuf *m, 320105197Ssam struct ipsecrequest *isr, 321105197Ssam struct mbuf **mp, 322105197Ssam int skip, 323105197Ssam int protoff 324105197Ssam) 325105197Ssam{ 326105197Ssam struct secasvar *sav; 327105197Ssam struct comp_algo *ipcompx; 328199899Sbz int error, ralen, maxpacketsize; 329105197Ssam struct cryptodesc *crdc; 330105197Ssam struct cryptop *crp; 331105197Ssam struct tdb_crypto *tc; 332105197Ssam 333105197Ssam sav = isr->sav; 334120585Ssam IPSEC_ASSERT(sav != NULL, ("null SA")); 335105197Ssam ipcompx = sav->tdb_compalgxform; 336120585Ssam IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 337105197Ssam 338199896Sbz /* 339199896Sbz * Do not touch the packet in case our payload to compress 340199896Sbz * is lower than the minimal threshold of the compression 341199896Sbz * alogrithm. We will just send out the data uncompressed. 342199896Sbz * See RFC 3173, 2.2. Non-Expansion Policy. 343199896Sbz */ 344199896Sbz if (m->m_pkthdr.len <= ipcompx->minlen) { 345199946Sbz V_ipcompstat.ipcomps_threshold++; 346199896Sbz return ipsec_process_done(m, isr); 347199896Sbz } 348199896Sbz 349105197Ssam ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 350181803Sbz V_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: 356199897Sbz maxpacketsize = IP_MAXPACKET; 357105197Ssam break; 358105197Ssam#endif /* INET */ 359105197Ssam#ifdef INET6 360105197Ssam case AF_INET6: 361199897Sbz maxpacketsize = IPV6_MAXPACKET; 362105197Ssam break; 363105197Ssam#endif /* INET6 */ 364105197Ssam default: 365181803Sbz V_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 } 374199899Sbz if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 375181803Sbz V_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), 380199899Sbz ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 381105197Ssam error = EMSGSIZE; 382105197Ssam goto bad; 383105197Ssam } 384105197Ssam 385105197Ssam /* Update the counters */ 386181803Sbz V_ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip; 387105197Ssam 388156756Ssam m = m_unshare(m, M_NOWAIT); 389105197Ssam if (m == NULL) { 390181803Sbz V_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 398199899Sbz /* Ok now, we can pass to the crypto processing. */ 399105197Ssam 400105197Ssam /* Get crypto descriptors */ 401105197Ssam crp = crypto_getreq(1); 402105197Ssam if (crp == NULL) { 403181803Sbz V_ipcompstat.ipcomps_crypto++; 404120585Ssam DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 405105197Ssam error = ENOBUFS; 406105197Ssam goto bad; 407105197Ssam } 408105197Ssam crdc = crp->crp_desc; 409105197Ssam 410105197Ssam /* Compression descriptor */ 411199899Sbz crdc->crd_skip = skip; 412199899Sbz crdc->crd_len = ralen; 413105197Ssam crdc->crd_flags = CRD_F_COMP; 414199899Sbz crdc->crd_inject = skip; 415105197Ssam 416105197Ssam /* Compression operation */ 417105197Ssam crdc->crd_alg = ipcompx->type; 418105197Ssam 419105197Ssam /* IPsec-specific opaque crypto info */ 420105197Ssam tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto), 421105197Ssam M_XDATA, M_NOWAIT|M_ZERO); 422105197Ssam if (tc == NULL) { 423181803Sbz V_ipcompstat.ipcomps_crypto++; 424120585Ssam DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__)); 425105197Ssam crypto_freereq(crp); 426105197Ssam error = ENOBUFS; 427105197Ssam goto bad; 428105197Ssam } 429105197Ssam 430105197Ssam tc->tc_isr = isr; 431220206Sfabient KEY_ADDREFSA(sav); 432220206Sfabient tc->tc_sav = sav; 433105197Ssam tc->tc_spi = sav->spi; 434105197Ssam tc->tc_dst = sav->sah->saidx.dst; 435105197Ssam tc->tc_proto = sav->sah->saidx.proto; 436199899Sbz tc->tc_protoff = protoff; 437199899Sbz tc->tc_skip = skip; 438105197Ssam 439105197Ssam /* Crypto operation descriptor */ 440105197Ssam crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 441117058Ssam crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 442105197Ssam crp->crp_buf = (caddr_t) m; 443105197Ssam crp->crp_callback = ipcomp_output_cb; 444105197Ssam crp->crp_opaque = (caddr_t) tc; 445105197Ssam crp->crp_sid = sav->tdb_cryptoid; 446105197Ssam 447105197Ssam return crypto_dispatch(crp); 448105197Ssambad: 449105197Ssam if (m) 450105197Ssam m_freem(m); 451105197Ssam return (error); 452105197Ssam} 453105197Ssam 454105197Ssam/* 455105197Ssam * IPComp output callback from the crypto driver. 456105197Ssam */ 457105197Ssamstatic int 458105197Ssamipcomp_output_cb(struct cryptop *crp) 459105197Ssam{ 460105197Ssam struct tdb_crypto *tc; 461105197Ssam struct ipsecrequest *isr; 462105197Ssam struct secasvar *sav; 463105197Ssam struct mbuf *m; 464199899Sbz int error, skip; 465105197Ssam 466105197Ssam tc = (struct tdb_crypto *) crp->crp_opaque; 467120585Ssam IPSEC_ASSERT(tc != NULL, ("null opaque data area!")); 468105197Ssam m = (struct mbuf *) crp->crp_buf; 469105197Ssam skip = tc->tc_skip; 470105197Ssam 471105197Ssam isr = tc->tc_isr; 472120585Ssam IPSECREQUEST_LOCK(isr); 473220206Sfabient sav = tc->tc_sav; 474220206Sfabient /* With the isr lock released SA pointer can be updated. */ 475220206Sfabient if (sav != isr->sav) { 476181803Sbz V_ipcompstat.ipcomps_notdb++; 477120585Ssam DPRINTF(("%s: SA expired while in crypto\n", __func__)); 478105197Ssam error = ENOBUFS; /*XXX*/ 479105197Ssam goto bad; 480105197Ssam } 481105197Ssam 482105197Ssam /* Check for crypto errors */ 483105197Ssam if (crp->crp_etype) { 484199905Sbz /* Reset the session ID */ 485105197Ssam if (sav->tdb_cryptoid != 0) 486105197Ssam sav->tdb_cryptoid = crp->crp_sid; 487105197Ssam 488105197Ssam if (crp->crp_etype == EAGAIN) { 489120585Ssam IPSECREQUEST_UNLOCK(isr); 490199899Sbz return crypto_dispatch(crp); 491105197Ssam } 492181803Sbz V_ipcompstat.ipcomps_noxform++; 493120585Ssam DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 494105197Ssam error = crp->crp_etype; 495105197Ssam goto bad; 496105197Ssam } 497105197Ssam /* Shouldn't happen... */ 498105197Ssam if (m == NULL) { 499181803Sbz V_ipcompstat.ipcomps_crypto++; 500120585Ssam DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 501105197Ssam error = EINVAL; 502105197Ssam goto bad; 503105197Ssam } 504181803Sbz V_ipcompstat.ipcomps_hist[sav->alg_comp]++; 505105197Ssam 506199899Sbz if (crp->crp_ilen - skip > crp->crp_olen) { 507199899Sbz struct mbuf *mo; 508199899Sbz struct ipcomp *ipcomp; 509199899Sbz int roff; 510199899Sbz uint8_t prot; 511199899Sbz 512199899Sbz /* Compression helped, inject IPCOMP header. */ 513199899Sbz mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 514199899Sbz if (mo == NULL) { 515199899Sbz V_ipcompstat.ipcomps_wrap++; 516199899Sbz DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n", 517199899Sbz __func__, ipsec_address(&sav->sah->saidx.dst), 518199899Sbz (u_long) ntohl(sav->spi))); 519199899Sbz error = ENOBUFS; 520199899Sbz goto bad; 521199899Sbz } 522199899Sbz ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 523199899Sbz 524199899Sbz /* Initialize the IPCOMP header */ 525199899Sbz /* XXX alignment always correct? */ 526199899Sbz switch (sav->sah->saidx.dst.sa.sa_family) { 527199899Sbz#ifdef INET 528199899Sbz case AF_INET: 529199899Sbz ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 530199899Sbz break; 531199899Sbz#endif /* INET */ 532199899Sbz#ifdef INET6 533199899Sbz case AF_INET6: 534199899Sbz ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 535199899Sbz break; 536199899Sbz#endif 537199899Sbz } 538199899Sbz ipcomp->comp_flags = 0; 539199899Sbz ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 540199899Sbz 541199899Sbz /* Fix Next Protocol in IPv4/IPv6 header */ 542199899Sbz prot = IPPROTO_IPCOMP; 543199899Sbz m_copyback(m, tc->tc_protoff, sizeof(u_int8_t), 544199899Sbz (u_char *)&prot); 545199899Sbz 546105197Ssam /* Adjust the length in the IP header */ 547105197Ssam switch (sav->sah->saidx.dst.sa.sa_family) { 548105197Ssam#ifdef INET 549105197Ssam case AF_INET: 550105197Ssam mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 551105197Ssam break; 552105197Ssam#endif /* INET */ 553105197Ssam#ifdef INET6 554105197Ssam case AF_INET6: 555105197Ssam mtod(m, struct ip6_hdr *)->ip6_plen = 556105197Ssam htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 557105197Ssam break; 558105197Ssam#endif /* INET6 */ 559105197Ssam default: 560181803Sbz V_ipcompstat.ipcomps_nopf++; 561120585Ssam DPRINTF(("%s: unknown/unsupported protocol " 562120585Ssam "family %d, IPCA %s/%08lx\n", __func__, 563105197Ssam sav->sah->saidx.dst.sa.sa_family, 564199897Sbz ipsec_address(&sav->sah->saidx.dst), 565105197Ssam (u_long) ntohl(sav->spi))); 566105197Ssam error = EPFNOSUPPORT; 567105197Ssam goto bad; 568105197Ssam } 569105197Ssam } else { 570199946Sbz /* Compression was useless, we have lost time. */ 571199946Sbz V_ipcompstat.ipcomps_uncompr++; 572199946Sbz DPRINTF(("%s: compressions was useless %d - %d <= %d\n", 573199946Sbz __func__, crp->crp_ilen, skip, crp->crp_olen)); 574199899Sbz /* XXX remember state to not compress the next couple 575199899Sbz * of packets, RFC 3173, 2.2. Non-Expansion Policy */ 576105197Ssam } 577105197Ssam 578105197Ssam /* Release the crypto descriptor */ 579105197Ssam free(tc, M_XDATA); 580105197Ssam crypto_freereq(crp); 581105197Ssam 582105197Ssam /* NB: m is reclaimed by ipsec_process_done. */ 583105197Ssam error = ipsec_process_done(m, isr); 584105197Ssam KEY_FREESAV(&sav); 585120585Ssam IPSECREQUEST_UNLOCK(isr); 586105197Ssam return error; 587105197Ssambad: 588105197Ssam if (sav) 589105197Ssam KEY_FREESAV(&sav); 590120585Ssam IPSECREQUEST_UNLOCK(isr); 591105197Ssam if (m) 592105197Ssam m_freem(m); 593105197Ssam free(tc, M_XDATA); 594105197Ssam crypto_freereq(crp); 595105197Ssam return error; 596105197Ssam} 597105197Ssam 598105197Ssamstatic struct xformsw ipcomp_xformsw = { 599105197Ssam XF_IPCOMP, XFT_COMP, "IPcomp", 600105197Ssam ipcomp_init, ipcomp_zeroize, ipcomp_input, 601105197Ssam ipcomp_output 602105197Ssam}; 603105197Ssam 604105197Ssamstatic void 605105197Ssamipcomp_attach(void) 606105197Ssam{ 607185088Szec 608105197Ssam xform_register(&ipcomp_xformsw); 609105197Ssam} 610190787Szec 611125099SsamSYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL); 612199946Sbz 613199946Sbzstatic void 614199946Sbzvnet_ipcomp_attach(const void *unused __unused) 615199946Sbz{ 616199946Sbz 617199946Sbz V_ipcompstat.version = IPCOMPSTAT_VERSION; 618199946Sbz} 619199946Sbz 620199946SbzVNET_SYSINIT(vnet_ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 621199946Sbz vnet_ipcomp_attach, NULL); 622