xform_ipcomp.c revision 199947
1105197Ssam/* $FreeBSD: head/sys/netipsec/xform_ipcomp.c 199947 2009-11-29 20:47:43Z bz $ */ 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> 51195699Srwatson#include <net/vnet.h> 52195699Srwatson 53105197Ssam#include <netipsec/ipsec.h> 54105197Ssam#include <netipsec/xform.h> 55105197Ssam 56105197Ssam#ifdef INET6 57105197Ssam#include <netinet/ip6.h> 58105197Ssam#include <netipsec/ipsec6.h> 59105197Ssam#endif 60105197Ssam 61105197Ssam#include <netipsec/ipcomp.h> 62105197Ssam#include <netipsec/ipcomp_var.h> 63105197Ssam 64105197Ssam#include <netipsec/key.h> 65105197Ssam#include <netipsec/key_debug.h> 66105197Ssam 67105197Ssam#include <opencrypto/cryptodev.h> 68105197Ssam#include <opencrypto/deflate.h> 69105197Ssam#include <opencrypto/xform.h> 70105197Ssam 71199947SbzVNET_DEFINE(int, ipcomp_enable) = 1; 72195699SrwatsonVNET_DEFINE(struct ipcompstat, ipcompstat); 73105197Ssam 74105197SsamSYSCTL_DECL(_net_inet_ipcomp); 75195699SrwatsonSYSCTL_VNET_INT(_net_inet_ipcomp, OID_AUTO, 76195699Srwatson ipcomp_enable, CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, ""); 77195699SrwatsonSYSCTL_VNET_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS, 78195699Srwatson stats, CTLFLAG_RD, &VNET_NAME(ipcompstat), ipcompstat, ""); 79105197Ssam 80105197Ssamstatic int ipcomp_input_cb(struct cryptop *crp); 81105197Ssamstatic int ipcomp_output_cb(struct cryptop *crp); 82105197Ssam 83105197Ssamstruct comp_algo * 84105197Ssamipcomp_algorithm_lookup(int alg) 85105197Ssam{ 86105197Ssam if (alg >= IPCOMP_ALG_MAX) 87105197Ssam return NULL; 88105197Ssam switch (alg) { 89105197Ssam case SADB_X_CALG_DEFLATE: 90105197Ssam return &comp_algo_deflate; 91105197Ssam } 92105197Ssam return NULL; 93105197Ssam} 94105197Ssam 95105197Ssam/* 96105197Ssam * ipcomp_init() is called when an CPI is being set up. 97105197Ssam */ 98105197Ssamstatic int 99105197Ssamipcomp_init(struct secasvar *sav, struct xformsw *xsp) 100105197Ssam{ 101105197Ssam struct comp_algo *tcomp; 102105197Ssam struct cryptoini cric; 103105197Ssam 104105197Ssam /* NB: algorithm really comes in alg_enc and not alg_comp! */ 105105197Ssam tcomp = ipcomp_algorithm_lookup(sav->alg_enc); 106105197Ssam if (tcomp == NULL) { 107120585Ssam DPRINTF(("%s: unsupported compression algorithm %d\n", __func__, 108105197Ssam sav->alg_comp)); 109105197Ssam return EINVAL; 110105197Ssam } 111105197Ssam sav->alg_comp = sav->alg_enc; /* set for doing histogram */ 112105197Ssam sav->tdb_xform = xsp; 113105197Ssam sav->tdb_compalgxform = tcomp; 114105197Ssam 115105197Ssam /* Initialize crypto session */ 116105197Ssam bzero(&cric, sizeof (cric)); 117105197Ssam cric.cri_alg = sav->tdb_compalgxform->type; 118105197Ssam 119181803Sbz return crypto_newsession(&sav->tdb_cryptoid, &cric, V_crypto_support); 120105197Ssam} 121105197Ssam 122105197Ssam/* 123105197Ssam * ipcomp_zeroize() used when IPCA is deleted 124105197Ssam */ 125105197Ssamstatic int 126105197Ssamipcomp_zeroize(struct secasvar *sav) 127105197Ssam{ 128105197Ssam int err; 129105197Ssam 130105197Ssam err = crypto_freesession(sav->tdb_cryptoid); 131105197Ssam sav->tdb_cryptoid = 0; 132105197Ssam return err; 133105197Ssam} 134105197Ssam 135105197Ssam/* 136105197Ssam * ipcomp_input() gets called to uncompress an input packet 137105197Ssam */ 138105197Ssamstatic int 139105197Ssamipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 140105197Ssam{ 141105197Ssam struct tdb_crypto *tc; 142105197Ssam struct cryptodesc *crdc; 143105197Ssam struct cryptop *crp; 144105197Ssam int hlen = IPCOMP_HLENGTH; 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__)); 151181803Sbz V_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__)); 160181803Sbz V_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) { 233181803Sbz V_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); 252199905Sbz return crypto_dispatch(crp); 253105197Ssam } 254181803Sbz V_ipcompstat.ipcomps_noxform++; 255120585Ssam DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 256105197Ssam error = crp->crp_etype; 257105197Ssam goto bad; 258105197Ssam } 259105197Ssam /* Shouldn't happen... */ 260105197Ssam if (m == NULL) { 261181803Sbz V_ipcompstat.ipcomps_crypto++; 262120585Ssam DPRINTF(("%s: null mbuf returned from crypto\n", __func__)); 263105197Ssam error = EINVAL; 264105197Ssam goto bad; 265105197Ssam } 266181803Sbz V_ipcompstat.ipcomps_hist[sav->alg_comp]++; 267105197Ssam 268105197Ssam clen = crp->crp_olen; /* Length of data after processing */ 269105197Ssam 270105197Ssam /* Release the crypto descriptors */ 271105197Ssam free(tc, M_XDATA), tc = NULL; 272105197Ssam crypto_freereq(crp), crp = NULL; 273105197Ssam 274105197Ssam /* In case it's not done already, adjust the size of the mbuf chain */ 275105197Ssam m->m_pkthdr.len = clen + hlen + skip; 276105197Ssam 277105197Ssam if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { 278181803Sbz V_ipcompstat.ipcomps_hdrops++; /*XXX*/ 279120585Ssam DPRINTF(("%s: m_pullup failed\n", __func__)); 280105197Ssam error = EINVAL; /*XXX*/ 281105197Ssam goto bad; 282105197Ssam } 283105197Ssam 284105197Ssam /* Keep the next protocol field */ 285105197Ssam addr = (caddr_t) mtod(m, struct ip *) + skip; 286105197Ssam nproto = ((struct ipcomp *) addr)->comp_nxt; 287105197Ssam 288105197Ssam /* Remove the IPCOMP header */ 289105197Ssam error = m_striphdr(m, skip, hlen); 290105197Ssam if (error) { 291181803Sbz V_ipcompstat.ipcomps_hdrops++; 292120585Ssam DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__, 293105197Ssam ipsec_address(&sav->sah->saidx.dst), 294105197Ssam (u_long) ntohl(sav->spi))); 295105197Ssam goto bad; 296105197Ssam } 297105197Ssam 298105197Ssam /* Restore the Next Protocol field */ 299105197Ssam m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); 300105197Ssam 301105197Ssam IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL); 302105197Ssam 303105197Ssam KEY_FREESAV(&sav); 304105197Ssam return error; 305105197Ssambad: 306105197Ssam if (sav) 307105197Ssam KEY_FREESAV(&sav); 308105197Ssam if (m) 309105197Ssam m_freem(m); 310105197Ssam if (tc != NULL) 311105197Ssam free(tc, M_XDATA); 312105197Ssam if (crp) 313105197Ssam crypto_freereq(crp); 314105197Ssam return error; 315105197Ssam} 316105197Ssam 317105197Ssam/* 318105197Ssam * IPComp output routine, called by ipsec[46]_process_packet() 319105197Ssam */ 320105197Ssamstatic int 321105197Ssamipcomp_output( 322105197Ssam struct mbuf *m, 323105197Ssam struct ipsecrequest *isr, 324105197Ssam struct mbuf **mp, 325105197Ssam int skip, 326105197Ssam int protoff 327105197Ssam) 328105197Ssam{ 329105197Ssam struct secasvar *sav; 330105197Ssam struct comp_algo *ipcompx; 331199899Sbz int error, ralen, maxpacketsize; 332105197Ssam struct cryptodesc *crdc; 333105197Ssam struct cryptop *crp; 334105197Ssam struct tdb_crypto *tc; 335105197Ssam 336105197Ssam sav = isr->sav; 337120585Ssam IPSEC_ASSERT(sav != NULL, ("null SA")); 338105197Ssam ipcompx = sav->tdb_compalgxform; 339120585Ssam IPSEC_ASSERT(ipcompx != NULL, ("null compression xform")); 340105197Ssam 341199896Sbz /* 342199896Sbz * Do not touch the packet in case our payload to compress 343199896Sbz * is lower than the minimal threshold of the compression 344199896Sbz * alogrithm. We will just send out the data uncompressed. 345199896Sbz * See RFC 3173, 2.2. Non-Expansion Policy. 346199896Sbz */ 347199896Sbz if (m->m_pkthdr.len <= ipcompx->minlen) { 348199946Sbz V_ipcompstat.ipcomps_threshold++; 349199896Sbz return ipsec_process_done(m, isr); 350199896Sbz } 351199896Sbz 352105197Ssam ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ 353181803Sbz V_ipcompstat.ipcomps_output++; 354105197Ssam 355105197Ssam /* Check for maximum packet size violations. */ 356105197Ssam switch (sav->sah->saidx.dst.sa.sa_family) { 357105197Ssam#ifdef INET 358105197Ssam case AF_INET: 359199897Sbz maxpacketsize = IP_MAXPACKET; 360105197Ssam break; 361105197Ssam#endif /* INET */ 362105197Ssam#ifdef INET6 363105197Ssam case AF_INET6: 364199897Sbz maxpacketsize = IPV6_MAXPACKET; 365105197Ssam break; 366105197Ssam#endif /* INET6 */ 367105197Ssam default: 368181803Sbz V_ipcompstat.ipcomps_nopf++; 369120585Ssam DPRINTF(("%s: unknown/unsupported protocol family %d, " 370120585Ssam "IPCA %s/%08lx\n", __func__, 371105197Ssam sav->sah->saidx.dst.sa.sa_family, 372105197Ssam ipsec_address(&sav->sah->saidx.dst), 373105197Ssam (u_long) ntohl(sav->spi))); 374105197Ssam error = EPFNOSUPPORT; 375105197Ssam goto bad; 376105197Ssam } 377199899Sbz if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) { 378181803Sbz V_ipcompstat.ipcomps_toobig++; 379120585Ssam DPRINTF(("%s: packet in IPCA %s/%08lx got too big " 380120585Ssam "(len %u, max len %u)\n", __func__, 381105197Ssam ipsec_address(&sav->sah->saidx.dst), 382105197Ssam (u_long) ntohl(sav->spi), 383199899Sbz ralen + skip + IPCOMP_HLENGTH, maxpacketsize)); 384105197Ssam error = EMSGSIZE; 385105197Ssam goto bad; 386105197Ssam } 387105197Ssam 388105197Ssam /* Update the counters */ 389181803Sbz V_ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip; 390105197Ssam 391156756Ssam m = m_unshare(m, M_NOWAIT); 392105197Ssam if (m == NULL) { 393181803Sbz V_ipcompstat.ipcomps_hdrops++; 394120585Ssam DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n", 395120585Ssam __func__, ipsec_address(&sav->sah->saidx.dst), 396105197Ssam (u_long) ntohl(sav->spi))); 397105197Ssam error = ENOBUFS; 398105197Ssam goto bad; 399105197Ssam } 400105197Ssam 401199899Sbz /* Ok now, we can pass to the crypto processing. */ 402105197Ssam 403105197Ssam /* Get crypto descriptors */ 404105197Ssam crp = crypto_getreq(1); 405105197Ssam if (crp == NULL) { 406181803Sbz V_ipcompstat.ipcomps_crypto++; 407120585Ssam DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__)); 408105197Ssam error = ENOBUFS; 409105197Ssam goto bad; 410105197Ssam } 411105197Ssam crdc = crp->crp_desc; 412105197Ssam 413105197Ssam /* Compression descriptor */ 414199899Sbz crdc->crd_skip = skip; 415199899Sbz crdc->crd_len = ralen; 416105197Ssam crdc->crd_flags = CRD_F_COMP; 417199899Sbz crdc->crd_inject = skip; 418105197Ssam 419105197Ssam /* Compression operation */ 420105197Ssam crdc->crd_alg = ipcompx->type; 421105197Ssam 422105197Ssam /* IPsec-specific opaque crypto info */ 423105197Ssam tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto), 424105197Ssam M_XDATA, M_NOWAIT|M_ZERO); 425105197Ssam if (tc == NULL) { 426181803Sbz V_ipcompstat.ipcomps_crypto++; 427120585Ssam DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__)); 428105197Ssam crypto_freereq(crp); 429105197Ssam error = ENOBUFS; 430105197Ssam goto bad; 431105197Ssam } 432105197Ssam 433105197Ssam tc->tc_isr = isr; 434105197Ssam tc->tc_spi = sav->spi; 435105197Ssam tc->tc_dst = sav->sah->saidx.dst; 436105197Ssam tc->tc_proto = sav->sah->saidx.proto; 437199899Sbz tc->tc_protoff = protoff; 438199899Sbz tc->tc_skip = skip; 439105197Ssam 440105197Ssam /* Crypto operation descriptor */ 441105197Ssam crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 442117058Ssam crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 443105197Ssam crp->crp_buf = (caddr_t) m; 444105197Ssam crp->crp_callback = ipcomp_output_cb; 445105197Ssam crp->crp_opaque = (caddr_t) tc; 446105197Ssam crp->crp_sid = sav->tdb_cryptoid; 447105197Ssam 448105197Ssam return crypto_dispatch(crp); 449105197Ssambad: 450105197Ssam if (m) 451105197Ssam m_freem(m); 452105197Ssam return (error); 453105197Ssam} 454105197Ssam 455105197Ssam/* 456105197Ssam * IPComp output callback from the crypto driver. 457105197Ssam */ 458105197Ssamstatic int 459105197Ssamipcomp_output_cb(struct cryptop *crp) 460105197Ssam{ 461105197Ssam struct tdb_crypto *tc; 462105197Ssam struct ipsecrequest *isr; 463105197Ssam struct secasvar *sav; 464105197Ssam struct mbuf *m; 465199899Sbz int error, skip; 466105197Ssam 467105197Ssam tc = (struct tdb_crypto *) crp->crp_opaque; 468120585Ssam IPSEC_ASSERT(tc != NULL, ("null opaque data area!")); 469105197Ssam m = (struct mbuf *) crp->crp_buf; 470105197Ssam skip = tc->tc_skip; 471105197Ssam 472105197Ssam isr = tc->tc_isr; 473120585Ssam IPSECREQUEST_LOCK(isr); 474105197Ssam sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi); 475105197Ssam if (sav == NULL) { 476181803Sbz V_ipcompstat.ipcomps_notdb++; 477120585Ssam DPRINTF(("%s: SA expired while in crypto\n", __func__)); 478105197Ssam error = ENOBUFS; /*XXX*/ 479105197Ssam goto bad; 480105197Ssam } 481120585Ssam IPSEC_ASSERT(isr->sav == sav, ("SA changed\n")); 482105197Ssam 483105197Ssam /* Check for crypto errors */ 484105197Ssam if (crp->crp_etype) { 485199905Sbz /* Reset the session ID */ 486105197Ssam if (sav->tdb_cryptoid != 0) 487105197Ssam sav->tdb_cryptoid = crp->crp_sid; 488105197Ssam 489105197Ssam if (crp->crp_etype == EAGAIN) { 490105197Ssam KEY_FREESAV(&sav); 491120585Ssam IPSECREQUEST_UNLOCK(isr); 492199899Sbz return crypto_dispatch(crp); 493105197Ssam } 494181803Sbz V_ipcompstat.ipcomps_noxform++; 495120585Ssam DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 496105197Ssam error = crp->crp_etype; 497105197Ssam goto bad; 498105197Ssam } 499105197Ssam /* Shouldn't happen... */ 500105197Ssam if (m == NULL) { 501181803Sbz V_ipcompstat.ipcomps_crypto++; 502120585Ssam DPRINTF(("%s: bogus return buffer from crypto\n", __func__)); 503105197Ssam error = EINVAL; 504105197Ssam goto bad; 505105197Ssam } 506181803Sbz V_ipcompstat.ipcomps_hist[sav->alg_comp]++; 507105197Ssam 508199899Sbz if (crp->crp_ilen - skip > crp->crp_olen) { 509199899Sbz struct mbuf *mo; 510199899Sbz struct ipcomp *ipcomp; 511199899Sbz int roff; 512199899Sbz uint8_t prot; 513199899Sbz 514199899Sbz /* Compression helped, inject IPCOMP header. */ 515199899Sbz mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff); 516199899Sbz if (mo == NULL) { 517199899Sbz V_ipcompstat.ipcomps_wrap++; 518199899Sbz DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n", 519199899Sbz __func__, ipsec_address(&sav->sah->saidx.dst), 520199899Sbz (u_long) ntohl(sav->spi))); 521199899Sbz error = ENOBUFS; 522199899Sbz goto bad; 523199899Sbz } 524199899Sbz ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); 525199899Sbz 526199899Sbz /* Initialize the IPCOMP header */ 527199899Sbz /* XXX alignment always correct? */ 528199899Sbz switch (sav->sah->saidx.dst.sa.sa_family) { 529199899Sbz#ifdef INET 530199899Sbz case AF_INET: 531199899Sbz ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; 532199899Sbz break; 533199899Sbz#endif /* INET */ 534199899Sbz#ifdef INET6 535199899Sbz case AF_INET6: 536199899Sbz ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; 537199899Sbz break; 538199899Sbz#endif 539199899Sbz } 540199899Sbz ipcomp->comp_flags = 0; 541199899Sbz ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); 542199899Sbz 543199899Sbz /* Fix Next Protocol in IPv4/IPv6 header */ 544199899Sbz prot = IPPROTO_IPCOMP; 545199899Sbz m_copyback(m, tc->tc_protoff, sizeof(u_int8_t), 546199899Sbz (u_char *)&prot); 547199899Sbz 548105197Ssam /* Adjust the length in the IP header */ 549105197Ssam switch (sav->sah->saidx.dst.sa.sa_family) { 550105197Ssam#ifdef INET 551105197Ssam case AF_INET: 552105197Ssam mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 553105197Ssam break; 554105197Ssam#endif /* INET */ 555105197Ssam#ifdef INET6 556105197Ssam case AF_INET6: 557105197Ssam mtod(m, struct ip6_hdr *)->ip6_plen = 558105197Ssam htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); 559105197Ssam break; 560105197Ssam#endif /* INET6 */ 561105197Ssam default: 562181803Sbz V_ipcompstat.ipcomps_nopf++; 563120585Ssam DPRINTF(("%s: unknown/unsupported protocol " 564120585Ssam "family %d, IPCA %s/%08lx\n", __func__, 565105197Ssam sav->sah->saidx.dst.sa.sa_family, 566199897Sbz ipsec_address(&sav->sah->saidx.dst), 567105197Ssam (u_long) ntohl(sav->spi))); 568105197Ssam error = EPFNOSUPPORT; 569105197Ssam goto bad; 570105197Ssam } 571105197Ssam } else { 572199946Sbz /* Compression was useless, we have lost time. */ 573199946Sbz V_ipcompstat.ipcomps_uncompr++; 574199946Sbz DPRINTF(("%s: compressions was useless %d - %d <= %d\n", 575199946Sbz __func__, crp->crp_ilen, skip, crp->crp_olen)); 576199899Sbz /* XXX remember state to not compress the next couple 577199899Sbz * of packets, RFC 3173, 2.2. Non-Expansion Policy */ 578105197Ssam } 579105197Ssam 580105197Ssam /* Release the crypto descriptor */ 581105197Ssam free(tc, M_XDATA); 582105197Ssam crypto_freereq(crp); 583105197Ssam 584105197Ssam /* NB: m is reclaimed by ipsec_process_done. */ 585105197Ssam error = ipsec_process_done(m, isr); 586105197Ssam KEY_FREESAV(&sav); 587120585Ssam IPSECREQUEST_UNLOCK(isr); 588105197Ssam return error; 589105197Ssambad: 590105197Ssam if (sav) 591105197Ssam KEY_FREESAV(&sav); 592120585Ssam IPSECREQUEST_UNLOCK(isr); 593105197Ssam if (m) 594105197Ssam m_freem(m); 595105197Ssam free(tc, M_XDATA); 596105197Ssam crypto_freereq(crp); 597105197Ssam return error; 598105197Ssam} 599105197Ssam 600105197Ssamstatic struct xformsw ipcomp_xformsw = { 601105197Ssam XF_IPCOMP, XFT_COMP, "IPcomp", 602105197Ssam ipcomp_init, ipcomp_zeroize, ipcomp_input, 603105197Ssam ipcomp_output 604105197Ssam}; 605105197Ssam 606105197Ssamstatic void 607105197Ssamipcomp_attach(void) 608105197Ssam{ 609185088Szec 610105197Ssam xform_register(&ipcomp_xformsw); 611105197Ssam} 612190787Szec 613125099SsamSYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL); 614199946Sbz 615199946Sbzstatic void 616199946Sbzvnet_ipcomp_attach(const void *unused __unused) 617199946Sbz{ 618199946Sbz 619199946Sbz V_ipcompstat.version = IPCOMPSTAT_VERSION; 620199946Sbz} 621199946Sbz 622199946SbzVNET_SYSINIT(vnet_ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 623199946Sbz vnet_ipcomp_attach, NULL); 624