sys/netproto/ipsec/xform_ipcomp.c

   1 /*      $FreeBSD: src/sys/netipsec/xform_ipcomp.c,v 1.1.4.2 2003/02/26 00:14:06 sam Exp $       */
   2 /* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */
   3
   4 /*
   5  * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *   notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *   notice, this list of conditions and the following disclaimer in the
  15  *   documentation and/or other materials provided with the distribution.
  16  * 3. The name of the author may not be used to endorse or promote products
  17  *   derived from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 /* IP payload compression protocol (IPComp), see RFC 2393 */
  32 #include "opt_inet.h"
  33 #include "opt_inet6.h"
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/mbuf.h>
  38 #include <sys/socket.h>
  39 #include <sys/kernel.h>
  40 #include <sys/protosw.h>
  41 #include <sys/sysctl.h>
  42 #include <sys/thread2.h>
  43
  44 #include <netinet/in.h>
  45 #include <netinet/in_systm.h>
  46 #include <netinet/ip.h>
  47 #include <netinet/ip_var.h>
  48
  49 #include <net/route.h>
  50 #include <netproto/ipsec/ipsec.h>
  51 #include <netproto/ipsec/xform.h>
  52
  53 #ifdef INET6
  54 #include <netinet/ip6.h>
  55 #include <netproto/ipsec/ipsec6.h>
  56 #endif
  57
  58 #include <netproto/ipsec/ipcomp.h>
  59 #include <netproto/ipsec/ipcomp_var.h>
  60
  61 #include <netproto/ipsec/key.h>
  62 #include <netproto/ipsec/key_debug.h>
  63
  64 #include <opencrypto/cryptodev.h>
  65 #include <opencrypto/deflate.h>
  66 #include <opencrypto/xform.h>
  67
  68 int     ipcomp_enable = 0;
  69 struct  ipcompstat ipcompstat;
  70
  71 SYSCTL_DECL(_net_inet_ipcomp);
  72 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO,
  73         ipcomp_enable,  CTLFLAG_RW,     &ipcomp_enable, 0, "");
  74 SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS,
  75         stats,          CTLFLAG_RD,     &ipcompstat,    ipcompstat, "");
  76
  77 static int ipcomp_input_cb(struct cryptop *crp);
  78 static int ipcomp_output_cb(struct cryptop *crp);
  79
  80 struct comp_algo *
  81 ipcomp_algorithm_lookup(int alg)
  82 {
  83         if (alg >= IPCOMP_ALG_MAX)
  84                 return NULL;
  85         switch (alg) {
  86         case SADB_X_CALG_DEFLATE:
  87                 return &comp_algo_deflate;
  88         }
  89         return NULL;
  90 }
  91
  92 /*
  93  * ipcomp_init() is called when an CPI is being set up.
  94  */
  95 static int
  96 ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
  97 {
  98         struct comp_algo *tcomp;
  99         struct cryptoini cric;
 100
 101         /* NB: algorithm really comes in alg_enc and not alg_comp! */
 102         tcomp = ipcomp_algorithm_lookup(sav->alg_enc);
 103         if (tcomp == NULL) {
 104                 DPRINTF(("ipcomp_init: unsupported compression algorithm %d\n",
 105                          sav->alg_comp));
 106                 return EINVAL;
 107         }
 108         sav->alg_comp = sav->alg_enc;           /* set for doing histogram */
 109         sav->tdb_xform = xsp;
 110         sav->tdb_compalgxform = tcomp;
 111
 112         /* Initialize crypto session */
 113         bzero(&cric, sizeof (cric));
 114         cric.cri_alg = sav->tdb_compalgxform->type;
 115
 116         return crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support);
 117 }
 118
 119 /*
 120  * ipcomp_zeroize() used when IPCA is deleted
 121  */
 122 static int
 123 ipcomp_zeroize(struct secasvar *sav)
 124 {
 125         int err;
 126
 127         err = crypto_freesession(sav->tdb_cryptoid);
 128         sav->tdb_cryptoid = 0;
 129         return err;
 130 }
 131
 132 /*
 133  * ipcomp_input() gets called to uncompress an input packet
 134  */
 135 static int
 136 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
 137 {
 138         struct tdb_crypto *tc;
 139         struct cryptodesc *crdc;
 140         struct cryptop *crp;
 141         struct ipcomp *ipcomp;
 142         caddr_t addr;
 143         int hlen = IPCOMP_HLENGTH;
 144
 145         /*
 146          * Check that the next header of the IPComp is not IPComp again, before
 147          * doing any real work.  Given it is not possible to do double
 148          * compression it means someone is playing tricks on us.
 149          */
 150         if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
 151                 ipcompstat.ipcomps_hdrops++;            /*XXX*/
 152                 DPRINTF(("%s: m_pullup failed\n", __func__));
 153                 return (ENOBUFS);
 154         }
 155         addr = (caddr_t) mtod(m, struct ip *) + skip;
 156         ipcomp = (struct ipcomp *)addr;
 157         if (ipcomp->comp_nxt == IPPROTO_IPCOMP) {
 158                 m_freem(m);
 159                 ipcompstat.ipcomps_pdrops++;    /* XXX have our own stats? */
 160                 DPRINTF(("%s: recursive compression detected\n", __func__));
 161                 return (EINVAL);
 162         }
 163
 164         /* Get crypto descriptors */
 165         crp = crypto_getreq(1);
 166         if (crp == NULL) {
 167                 m_freem(m);
 168                 DPRINTF(("ipcomp_input: no crypto descriptors\n"));
 169                 ipcompstat.ipcomps_crypto++;
 170                 return ENOBUFS;
 171         }
 172         /* Get IPsec-specific opaque pointer */
 173         tc = kmalloc(sizeof (*tc), M_XDATA,
 174                     M_INTWAIT | M_ZERO | M_NULLOK);
 175         if (tc == NULL) {
 176                 m_freem(m);
 177                 crypto_freereq(crp);
 178                 DPRINTF(("ipcomp_input: cannot allocate tdb_crypto\n"));
 179                 ipcompstat.ipcomps_crypto++;
 180                 return ENOBUFS;
 181         }
 182         crdc = crp->crp_desc;
 183
 184         crdc->crd_skip = skip + hlen;
 185         crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
 186         crdc->crd_inject = skip;
 187
 188         tc->tc_ptr = 0;
 189
 190         /* Decompression operation */
 191         crdc->crd_alg = sav->tdb_compalgxform->type;
 192
 193         /* Crypto operation descriptor */
 194         crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
 195         crp->crp_flags = CRYPTO_F_IMBUF;
 196         crp->crp_buf = (caddr_t) m;
 197         crp->crp_callback = ipcomp_input_cb;
 198         crp->crp_sid = sav->tdb_cryptoid;
 199         crp->crp_opaque = (caddr_t) tc;
 200
 201         /* These are passed as-is to the callback */
 202         tc->tc_spi = sav->spi;
 203         tc->tc_dst = sav->sah->saidx.dst;
 204         tc->tc_proto = sav->sah->saidx.proto;
 205         tc->tc_protoff = protoff;
 206         tc->tc_skip = skip;
 207
 208         return crypto_dispatch(crp);
 209 }
 210
 211 #ifdef INET6
 212 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do {              \
 213         if (saidx->dst.sa.sa_family == AF_INET6) {                           \
 214                 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
 215         } else {                                                             \
 216                 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
 217         }                                                                    \
 218 } while (0)
 219 #else
 220 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag)                   \
 221         (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
 222 #endif
 223
 224 /*
 225  * IPComp input callback from the crypto driver.
 226  */
 227 static int
 228 ipcomp_input_cb(struct cryptop *crp)
 229 {
 230         struct tdb_crypto *tc;
 231         int skip, protoff;
 232         struct mbuf *m;
 233         struct secasvar *sav;
 234         struct secasindex *saidx;
 235         int hlen = IPCOMP_HLENGTH, error, clen;
 236         u_int8_t nproto;
 237         caddr_t addr;
 238
 239         tc = (struct tdb_crypto *) crp->crp_opaque;
 240         KASSERT(tc != NULL, ("ipcomp_input_cb: null opaque crypto data area!"));
 241         skip = tc->tc_skip;
 242         protoff = tc->tc_protoff;
 243         m = (struct mbuf *) crp->crp_buf;
 244
 245         crit_enter();
 246
 247         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
 248         if (sav == NULL) {
 249                 ipcompstat.ipcomps_notdb++;
 250                 DPRINTF(("ipcomp_input_cb: SA expired while in crypto\n"));
 251                 error = ENOBUFS;                /*XXX*/
 252                 goto bad;
 253         }
 254
 255         saidx = &sav->sah->saidx;
 256         KASSERT(saidx->dst.sa.sa_family == AF_INET ||
 257                 saidx->dst.sa.sa_family == AF_INET6,
 258                 ("ah_input_cb: unexpected protocol family %u",
 259                  saidx->dst.sa.sa_family));
 260
 261         /* Check for crypto errors */
 262         if (crp->crp_etype) {
 263                 /* Reset the session ID */
 264                 if (sav->tdb_cryptoid != 0)
 265                         sav->tdb_cryptoid = crp->crp_sid;
 266
 267                 if (crp->crp_etype == EAGAIN) {
 268                         KEY_FREESAV(&sav);
 269                         crit_exit();
 270                         return crypto_dispatch(crp);
 271                 }
 272
 273                 ipcompstat.ipcomps_noxform++;
 274                 DPRINTF(("ipcomp_input_cb: crypto error %d\n", crp->crp_etype));
 275                 error = crp->crp_etype;
 276                 goto bad;
 277         }
 278         /* Shouldn't happen... */
 279         if (m == NULL) {
 280                 ipcompstat.ipcomps_crypto++;
 281                 DPRINTF(("ipcomp_input_cb: null mbuf returned from crypto\n"));
 282                 error = EINVAL;
 283                 goto bad;
 284         }
 285         ipcompstat.ipcomps_hist[sav->alg_comp]++;
 286
 287         clen = crp->crp_olen;           /* Length of data after processing */
 288
 289         /* Release the crypto descriptors */
 290         kfree(tc, M_XDATA), tc = NULL;
 291         crypto_freereq(crp), crp = NULL;
 292
 293         /* In case it's not done already, adjust the size of the mbuf chain */
 294         m->m_pkthdr.len = clen + hlen + skip;
 295
 296         if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
 297                 ipcompstat.ipcomps_hdrops++;            /*XXX*/
 298                 DPRINTF(("ipcomp_input_cb: m_pullup failed\n"));
 299                 error = EINVAL;                         /*XXX*/
 300                 goto bad;
 301         }
 302
 303         /* Keep the next protocol field */
 304         addr = (caddr_t) mtod(m, struct ip *) + skip;
 305         nproto = ((struct ipcomp *) addr)->comp_nxt;
 306
 307         /* Remove the IPCOMP header */
 308         error = m_striphdr(m, skip, hlen);
 309         if (error) {
 310                 ipcompstat.ipcomps_hdrops++;
 311                 DPRINTF(("ipcomp_input_cb: bad mbuf chain, IPCA %s/%08lx\n",
 312                          ipsec_address(&sav->sah->saidx.dst),
 313                          (u_long) ntohl(sav->spi)));
 314                 goto bad;
 315         }
 316
 317         /* Restore the Next Protocol field */
 318         m_copyback(m, protoff, sizeof (u_int8_t), &nproto);
 319
 320         IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
 321
 322         KEY_FREESAV(&sav);
 323         crit_exit();
 324         return error;
 325 bad:
 326         if (sav)
 327                 KEY_FREESAV(&sav);
 328         crit_exit();
 329         if (m)
 330                 m_freem(m);
 331         if (tc != NULL)
 332                 kfree(tc, M_XDATA);
 333         if (crp)
 334                 crypto_freereq(crp);
 335         return error;
 336 }
 337
 338 /*
 339  * IPComp output routine, called by ipsec[46]_process_packet()
 340  */
 341 static int
 342 ipcomp_output(
 343         struct mbuf *m,
 344         struct ipsecrequest *isr,
 345         struct mbuf **mp,
 346         int skip,
 347         int protoff
 348 )
 349 {
 350         struct secasvar *sav;
 351         struct comp_algo *ipcompx;
 352         int error, ralen, hlen, maxpacketsize, roff;
 353         u_int8_t prot;
 354         struct cryptodesc *crdc;
 355         struct cryptop *crp;
 356         struct tdb_crypto *tc;
 357         struct mbuf *mo;
 358         struct ipcomp *ipcomp;
 359
 360         sav = isr->sav;
 361         KASSERT(sav != NULL, ("ipcomp_output: null SA"));
 362         ipcompx = sav->tdb_compalgxform;
 363         KASSERT(ipcompx != NULL, ("ipcomp_output: null compression xform"));
 364
 365         ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
 366         hlen = IPCOMP_HLENGTH;
 367
 368         ipcompstat.ipcomps_output++;
 369
 370         /* Check for maximum packet size violations. */
 371         switch (sav->sah->saidx.dst.sa.sa_family) {
 372 #ifdef INET
 373         case AF_INET:
 374                 maxpacketsize =  IP_MAXPACKET;
 375                 break;
 376 #endif /* INET */
 377 #ifdef INET6
 378         case AF_INET6:
 379                 maxpacketsize =  IPV6_MAXPACKET;
 380                 break;
 381 #endif /* INET6 */
 382         default:
 383                 ipcompstat.ipcomps_nopf++;
 384                 DPRINTF(("ipcomp_output: unknown/unsupported protocol family %d"
 385                     ", IPCA %s/%08lx\n",
 386                     sav->sah->saidx.dst.sa.sa_family,
 387                     ipsec_address(&sav->sah->saidx.dst),
 388                     (u_long) ntohl(sav->spi)));
 389                 error = EPFNOSUPPORT;
 390                 goto bad;
 391         }
 392         if (skip + hlen + ralen > maxpacketsize) {
 393                 ipcompstat.ipcomps_toobig++;
 394                 DPRINTF(("ipcomp_output: packet in IPCA %s/%08lx got too big "
 395                     "(len %u, max len %u)\n",
 396                     ipsec_address(&sav->sah->saidx.dst),
 397                     (u_long) ntohl(sav->spi),
 398                     skip + hlen + ralen, maxpacketsize));
 399                 error = EMSGSIZE;
 400                 goto bad;
 401         }
 402
 403         /* Update the counters */
 404         ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip;
 405
 406         m = m_clone(m);
 407         if (m == NULL) {
 408                 ipcompstat.ipcomps_hdrops++;
 409                 DPRINTF(("ipcomp_output: cannot clone mbuf chain, IPCA %s/%08lx\n",
 410                     ipsec_address(&sav->sah->saidx.dst),
 411                     (u_long) ntohl(sav->spi)));
 412                 error = ENOBUFS;
 413                 goto bad;
 414         }
 415
 416         /* Inject IPCOMP header */
 417         mo = m_makespace(m, skip, hlen, &roff);
 418         if (mo == NULL) {
 419                 ipcompstat.ipcomps_wrap++;
 420                 DPRINTF(("ipcomp_output: failed to inject IPCOMP header for "
 421                     "IPCA %s/%08lx\n",
 422                     ipsec_address(&sav->sah->saidx.dst),
 423                     (u_long) ntohl(sav->spi)));
 424                 error = ENOBUFS;
 425                 goto bad;
 426         }
 427         ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
 428
 429         /* Initialize the IPCOMP header */
 430         /* XXX alignment always correct? */
 431         switch (sav->sah->saidx.dst.sa.sa_family) {
 432 #ifdef INET
 433         case AF_INET:
 434                 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
 435                 break;
 436 #endif /* INET */
 437 #ifdef INET6
 438         case AF_INET6:
 439                 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
 440                 break;
 441 #endif
 442         }
 443         ipcomp->comp_flags = 0;
 444         ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
 445
 446         /* Fix Next Protocol in IPv4/IPv6 header */
 447         prot = IPPROTO_IPCOMP;
 448         m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot);
 449
 450         /* Ok now, we can pass to the crypto processing */
 451
 452         /* Get crypto descriptors */
 453         crp = crypto_getreq(1);
 454         if (crp == NULL) {
 455                 ipcompstat.ipcomps_crypto++;
 456                 DPRINTF(("ipcomp_output: failed to acquire crypto descriptor\n"));
 457                 error = ENOBUFS;
 458                 goto bad;
 459         }
 460         crdc = crp->crp_desc;
 461
 462         /* Compression descriptor */
 463         crdc->crd_skip = skip + hlen;
 464         crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
 465         crdc->crd_flags = CRD_F_COMP;
 466         crdc->crd_inject = skip + hlen;
 467
 468         /* Compression operation */
 469         crdc->crd_alg = ipcompx->type;
 470
 471         /* IPsec-specific opaque crypto info */
 472         tc = kmalloc(sizeof(struct tdb_crypto),
 473                     M_XDATA, M_INTWAIT | M_ZERO | M_NULLOK);
 474         if (tc == NULL) {
 475                 ipcompstat.ipcomps_crypto++;
 476                 DPRINTF(("ipcomp_output: failed to allocate tdb_crypto\n"));
 477                 crypto_freereq(crp);
 478                 error = ENOBUFS;
 479                 goto bad;
 480         }
 481
 482         tc->tc_isr = isr;
 483         tc->tc_spi = sav->spi;
 484         tc->tc_dst = sav->sah->saidx.dst;
 485         tc->tc_proto = sav->sah->saidx.proto;
 486         tc->tc_skip = skip + hlen;
 487
 488         /* Crypto operation descriptor */
 489         crp->crp_ilen = m->m_pkthdr.len;        /* Total input length */
 490         crp->crp_flags = CRYPTO_F_IMBUF;
 491         crp->crp_buf = (caddr_t) m;
 492         crp->crp_callback = ipcomp_output_cb;
 493         crp->crp_opaque = (caddr_t) tc;
 494         crp->crp_sid = sav->tdb_cryptoid;
 495
 496         return crypto_dispatch(crp);
 497 bad:
 498         if (m)
 499                 m_freem(m);
 500         return (error);
 501 }
 502
 503 /*
 504  * IPComp output callback from the crypto driver.
 505  */
 506 static int
 507 ipcomp_output_cb(struct cryptop *crp)
 508 {
 509         struct tdb_crypto *tc;
 510         struct ipsecrequest *isr;
 511         struct secasvar *sav;
 512         struct mbuf *m;
 513         int error, skip, rlen;
 514
 515         tc = (struct tdb_crypto *) crp->crp_opaque;
 516         KASSERT(tc != NULL, ("ipcomp_output_cb: null opaque data area!"));
 517         m = (struct mbuf *) crp->crp_buf;
 518         skip = tc->tc_skip;
 519         rlen = crp->crp_ilen - skip;
 520
 521         crit_enter();
 522
 523         isr = tc->tc_isr;
 524         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
 525         if (sav == NULL) {
 526                 ipcompstat.ipcomps_notdb++;
 527                 DPRINTF(("ipcomp_output_cb: SA expired while in crypto\n"));
 528                 error = ENOBUFS;                /*XXX*/
 529                 goto bad;
 530         }
 531         KASSERT(isr->sav == sav, ("ipcomp_output_cb: SA changed"));
 532
 533         /* Check for crypto errors */
 534         if (crp->crp_etype) {
 535                 /* Reset session ID */
 536                 if (sav->tdb_cryptoid != 0)
 537                         sav->tdb_cryptoid = crp->crp_sid;
 538
 539                 if (crp->crp_etype == EAGAIN) {
 540                         KEY_FREESAV(&sav);
 541                         crit_exit();
 542                         return crypto_dispatch(crp);
 543                 }
 544                 ipcompstat.ipcomps_noxform++;
 545                 DPRINTF(("ipcomp_output_cb: crypto error %d\n", crp->crp_etype));
 546                 error = crp->crp_etype;
 547                 goto bad;
 548         }
 549         /* Shouldn't happen... */
 550         if (m == NULL) {
 551                 ipcompstat.ipcomps_crypto++;
 552                 DPRINTF(("ipcomp_output_cb: bogus return buffer from crypto\n"));
 553                 error = EINVAL;
 554                 goto bad;
 555         }
 556         ipcompstat.ipcomps_hist[sav->alg_comp]++;
 557
 558         if (rlen > crp->crp_olen) {
 559                 /* Adjust the length in the IP header */
 560                 switch (sav->sah->saidx.dst.sa.sa_family) {
 561 #ifdef INET
 562                 case AF_INET:
 563                         mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
 564                         break;
 565 #endif /* INET */
 566 #ifdef INET6
 567                 case AF_INET6:
 568                         mtod(m, struct ip6_hdr *)->ip6_plen =
 569                                 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
 570                         break;
 571 #endif /* INET6 */
 572                 default:
 573                         ipcompstat.ipcomps_nopf++;
 574                         DPRINTF(("ipcomp_output: unknown/unsupported protocol "
 575                             "family %d, IPCA %s/%08lx\n",
 576                             sav->sah->saidx.dst.sa.sa_family,
 577                             ipsec_address(&sav->sah->saidx.dst),
 578                             (u_long) ntohl(sav->spi)));
 579                         error = EPFNOSUPPORT;
 580                         goto bad;
 581                 }
 582         } else {
 583                 /* compression was useless, we have lost time */
 584                 /* XXX add statistic */
 585         }
 586
 587         /* Release the crypto descriptor */
 588         kfree(tc, M_XDATA);
 589         crypto_freereq(crp);
 590
 591         /* NB: m is reclaimed by ipsec_process_done. */
 592         error = ipsec_process_done(m, isr);
 593         KEY_FREESAV(&sav);
 594         crit_exit();
 595         return error;
 596 bad:
 597         if (sav)
 598                 KEY_FREESAV(&sav);
 599         crit_exit();
 600         if (m)
 601                 m_freem(m);
 602         kfree(tc, M_XDATA);
 603         crypto_freereq(crp);
 604         return error;
 605 }
 606
 607 static struct xformsw ipcomp_xformsw = {
 608         XF_IPCOMP,              XFT_COMP,               "IPcomp",
 609         ipcomp_init,            ipcomp_zeroize,         ipcomp_input,
 610         ipcomp_output
 611 };
 612
 613 static void
 614 ipcomp_attach(void)
 615 {
 616         xform_register(&ipcomp_xformsw);
 617 }
 618 SYSINIT(ipcomp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipcomp_attach, NULL)