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 /*      $DragonFly: src/sys/netproto/ipsec/xform_ipcomp.c,v 1.10 2006/10/12 01:32:51 hsu Exp $  */
   3 /* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */
   4
   5 /*
   6  * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *   notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *   notice, this list of conditions and the following disclaimer in the
  16  *   documentation and/or other materials provided with the distribution.
  17  * 3. The name of the author may not be used to endorse or promote products
  18  *   derived from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /* IP payload compression protocol (IPComp), see RFC 2393 */
  33 #include "opt_inet.h"
  34 #include "opt_inet6.h"
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/mbuf.h>
  39 #include <sys/socket.h>
  40 #include <sys/kernel.h>
  41 #include <sys/protosw.h>
  42 #include <sys/sysctl.h>
  43 #include <sys/thread2.h>
  44
  45 #include <netinet/in.h>
  46 #include <netinet/in_systm.h>
  47 #include <netinet/ip.h>
  48 #include <netinet/ip_var.h>
  49
  50 #include <net/route.h>
  51 #include <netproto/ipsec/ipsec.h>
  52 #include <netproto/ipsec/xform.h>
  53
  54 #ifdef INET6
  55 #include <netinet/ip6.h>
  56 #include <netproto/ipsec/ipsec6.h>
  57 #endif
  58
  59 #include <netproto/ipsec/ipcomp.h>
  60 #include <netproto/ipsec/ipcomp_var.h>
  61
  62 #include <netproto/ipsec/key.h>
  63 #include <netproto/ipsec/key_debug.h>
  64
  65 #include <opencrypto/cryptodev.h>
  66 #include <opencrypto/deflate.h>
  67 #include <opencrypto/xform.h>
  68
  69 int     ipcomp_enable = 0;
  70 struct  ipcompstat ipcompstat;
  71
  72 SYSCTL_DECL(_net_inet_ipcomp);
  73 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO,
  74         ipcomp_enable,  CTLFLAG_RW,     &ipcomp_enable, 0, "");
  75 SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS,
  76         stats,          CTLFLAG_RD,     &ipcompstat,    ipcompstat, "");
  77
  78 static int ipcomp_input_cb(struct cryptop *crp);
  79 static int ipcomp_output_cb(struct cryptop *crp);
  80
  81 struct comp_algo *
  82 ipcomp_algorithm_lookup(int alg)
  83 {
  84         if (alg >= IPCOMP_ALG_MAX)
  85                 return NULL;
  86         switch (alg) {
  87         case SADB_X_CALG_DEFLATE:
  88                 return &comp_algo_deflate;
  89         }
  90         return NULL;
  91 }
  92
  93 /*
  94  * ipcomp_init() is called when an CPI is being set up.
  95  */
  96 static int
  97 ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
  98 {
  99         struct comp_algo *tcomp;
 100         struct cryptoini cric;
 101
 102         /* NB: algorithm really comes in alg_enc and not alg_comp! */
 103         tcomp = ipcomp_algorithm_lookup(sav->alg_enc);
 104         if (tcomp == NULL) {
 105                 DPRINTF(("ipcomp_init: unsupported compression algorithm %d\n",
 106                          sav->alg_comp));
 107                 return EINVAL;
 108         }
 109         sav->alg_comp = sav->alg_enc;           /* set for doing histogram */
 110         sav->tdb_xform = xsp;
 111         sav->tdb_compalgxform = tcomp;
 112
 113         /* Initialize crypto session */
 114         bzero(&cric, sizeof (cric));
 115         cric.cri_alg = sav->tdb_compalgxform->type;
 116
 117         return crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support);
 118 }
 119
 120 /*
 121  * ipcomp_zeroize() used when IPCA is deleted
 122  */
 123 static int
 124 ipcomp_zeroize(struct secasvar *sav)
 125 {
 126         int err;
 127
 128         err = crypto_freesession(sav->tdb_cryptoid);
 129         sav->tdb_cryptoid = 0;
 130         return err;
 131 }
 132
 133 /*
 134  * ipcomp_input() gets called to uncompress an input packet
 135  */
 136 static int
 137 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
 138 {
 139         struct tdb_crypto *tc;
 140         struct cryptodesc *crdc;
 141         struct cryptop *crp;
 142         int hlen = IPCOMP_HLENGTH;
 143
 144         /* Get crypto descriptors */
 145         crp = crypto_getreq(1);
 146         if (crp == NULL) {
 147                 m_freem(m);
 148                 DPRINTF(("ipcomp_input: no crypto descriptors\n"));
 149                 ipcompstat.ipcomps_crypto++;
 150                 return ENOBUFS;
 151         }
 152         /* Get IPsec-specific opaque pointer */
 153         tc = kmalloc(sizeof (*tc), M_XDATA,
 154                     M_INTWAIT | M_ZERO | M_NULLOK);
 155         if (tc == NULL) {
 156                 m_freem(m);
 157                 crypto_freereq(crp);
 158                 DPRINTF(("ipcomp_input: cannot allocate tdb_crypto\n"));
 159                 ipcompstat.ipcomps_crypto++;
 160                 return ENOBUFS;
 161         }
 162         crdc = crp->crp_desc;
 163
 164         crdc->crd_skip = skip + hlen;
 165         crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
 166         crdc->crd_inject = skip;
 167
 168         tc->tc_ptr = 0;
 169
 170         /* Decompression operation */
 171         crdc->crd_alg = sav->tdb_compalgxform->type;
 172
 173         /* Crypto operation descriptor */
 174         crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
 175         crp->crp_flags = CRYPTO_F_IMBUF;
 176         crp->crp_buf = (caddr_t) m;
 177         crp->crp_callback = ipcomp_input_cb;
 178         crp->crp_sid = sav->tdb_cryptoid;
 179         crp->crp_opaque = (caddr_t) tc;
 180
 181         /* These are passed as-is to the callback */
 182         tc->tc_spi = sav->spi;
 183         tc->tc_dst = sav->sah->saidx.dst;
 184         tc->tc_proto = sav->sah->saidx.proto;
 185         tc->tc_protoff = protoff;
 186         tc->tc_skip = skip;
 187
 188         return crypto_dispatch(crp);
 189 }
 190
 191 #ifdef INET6
 192 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do {              \
 193         if (saidx->dst.sa.sa_family == AF_INET6) {                           \
 194                 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
 195         } else {                                                             \
 196                 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
 197         }                                                                    \
 198 } while (0)
 199 #else
 200 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag)                   \
 201         (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
 202 #endif
 203
 204 /*
 205  * IPComp input callback from the crypto driver.
 206  */
 207 static int
 208 ipcomp_input_cb(struct cryptop *crp)
 209 {
 210         struct cryptodesc *crd;
 211         struct tdb_crypto *tc;
 212         int skip, protoff;
 213         struct mtag *mtag;
 214         struct mbuf *m;
 215         struct secasvar *sav;
 216         struct secasindex *saidx;
 217         int hlen = IPCOMP_HLENGTH, error, clen;
 218         u_int8_t nproto;
 219         caddr_t addr;
 220
 221         crd = crp->crp_desc;
 222
 223         tc = (struct tdb_crypto *) crp->crp_opaque;
 224         KASSERT(tc != NULL, ("ipcomp_input_cb: null opaque crypto data area!"));
 225         skip = tc->tc_skip;
 226         protoff = tc->tc_protoff;
 227         mtag = (struct mtag *) tc->tc_ptr;
 228         m = (struct mbuf *) crp->crp_buf;
 229
 230         crit_enter();
 231
 232         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
 233         if (sav == NULL) {
 234                 ipcompstat.ipcomps_notdb++;
 235                 DPRINTF(("ipcomp_input_cb: SA expired while in crypto\n"));
 236                 error = ENOBUFS;                /*XXX*/
 237                 goto bad;
 238         }
 239
 240         saidx = &sav->sah->saidx;
 241         KASSERT(saidx->dst.sa.sa_family == AF_INET ||
 242                 saidx->dst.sa.sa_family == AF_INET6,
 243                 ("ah_input_cb: unexpected protocol family %u",
 244                  saidx->dst.sa.sa_family));
 245
 246         /* Check for crypto errors */
 247         if (crp->crp_etype) {
 248                 /* Reset the session ID */
 249                 if (sav->tdb_cryptoid != 0)
 250                         sav->tdb_cryptoid = crp->crp_sid;
 251
 252                 if (crp->crp_etype == EAGAIN) {
 253                         KEY_FREESAV(&sav);
 254                         crit_exit();
 255                         return crypto_dispatch(crp);
 256                 }
 257
 258                 ipcompstat.ipcomps_noxform++;
 259                 DPRINTF(("ipcomp_input_cb: crypto error %d\n", crp->crp_etype));
 260                 error = crp->crp_etype;
 261                 goto bad;
 262         }
 263         /* Shouldn't happen... */
 264         if (m == NULL) {
 265                 ipcompstat.ipcomps_crypto++;
 266                 DPRINTF(("ipcomp_input_cb: null mbuf returned from crypto\n"));
 267                 error = EINVAL;
 268                 goto bad;
 269         }
 270         ipcompstat.ipcomps_hist[sav->alg_comp]++;
 271
 272         clen = crp->crp_olen;           /* Length of data after processing */
 273
 274         /* Release the crypto descriptors */
 275         kfree(tc, M_XDATA), tc = NULL;
 276         crypto_freereq(crp), crp = NULL;
 277
 278         /* In case it's not done already, adjust the size of the mbuf chain */
 279         m->m_pkthdr.len = clen + hlen + skip;
 280
 281         if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
 282                 ipcompstat.ipcomps_hdrops++;            /*XXX*/
 283                 DPRINTF(("ipcomp_input_cb: m_pullup failed\n"));
 284                 error = EINVAL;                         /*XXX*/
 285                 goto bad;
 286         }
 287
 288         /* Keep the next protocol field */
 289         addr = (caddr_t) mtod(m, struct ip *) + skip;
 290         nproto = ((struct ipcomp *) addr)->comp_nxt;
 291
 292         /* Remove the IPCOMP header */
 293         error = m_striphdr(m, skip, hlen);
 294         if (error) {
 295                 ipcompstat.ipcomps_hdrops++;
 296                 DPRINTF(("ipcomp_input_cb: bad mbuf chain, IPCA %s/%08lx\n",
 297                          ipsec_address(&sav->sah->saidx.dst),
 298                          (u_long) ntohl(sav->spi)));
 299                 goto bad;
 300         }
 301
 302         /* Restore the Next Protocol field */
 303         m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
 304
 305         IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
 306
 307         KEY_FREESAV(&sav);
 308         crit_exit();
 309         return error;
 310 bad:
 311         if (sav)
 312                 KEY_FREESAV(&sav);
 313         crit_exit();
 314         if (m)
 315                 m_freem(m);
 316         if (tc != NULL)
 317                 kfree(tc, M_XDATA);
 318         if (crp)
 319                 crypto_freereq(crp);
 320         return error;
 321 }
 322
 323 /*
 324  * IPComp output routine, called by ipsec[46]_process_packet()
 325  */
 326 static int
 327 ipcomp_output(
 328         struct mbuf *m,
 329         struct ipsecrequest *isr,
 330         struct mbuf **mp,
 331         int skip,
 332         int protoff
 333 )
 334 {
 335         struct secasvar *sav;
 336         struct comp_algo *ipcompx;
 337         int error, ralen, hlen, maxpacketsize, roff;
 338         u_int8_t prot;
 339         struct cryptodesc *crdc;
 340         struct cryptop *crp;
 341         struct tdb_crypto *tc;
 342         struct mbuf *mo;
 343         struct ipcomp *ipcomp;
 344
 345         sav = isr->sav;
 346         KASSERT(sav != NULL, ("ipcomp_output: null SA"));
 347         ipcompx = sav->tdb_compalgxform;
 348         KASSERT(ipcompx != NULL, ("ipcomp_output: null compression xform"));
 349
 350         ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
 351         hlen = IPCOMP_HLENGTH;
 352
 353         ipcompstat.ipcomps_output++;
 354
 355         /* Check for maximum packet size violations. */
 356         switch (sav->sah->saidx.dst.sa.sa_family) {
 357 #ifdef INET
 358         case AF_INET:
 359                 maxpacketsize =  IP_MAXPACKET;
 360                 break;
 361 #endif /* INET */
 362 #ifdef INET6
 363         case AF_INET6:
 364                 maxpacketsize =  IPV6_MAXPACKET;
 365                 break;
 366 #endif /* INET6 */
 367         default:
 368                 ipcompstat.ipcomps_nopf++;
 369                 DPRINTF(("ipcomp_output: unknown/unsupported protocol family %d"
 370                     ", IPCA %s/%08lx\n",
 371                     sav->sah->saidx.dst.sa.sa_family,
 372                     ipsec_address(&sav->sah->saidx.dst),
 373                     (u_long) ntohl(sav->spi)));
 374                 error = EPFNOSUPPORT;
 375                 goto bad;
 376         }
 377         if (skip + hlen + ralen > maxpacketsize) {
 378                 ipcompstat.ipcomps_toobig++;
 379                 DPRINTF(("ipcomp_output: packet in IPCA %s/%08lx got too big "
 380                     "(len %u, max len %u)\n",
 381                     ipsec_address(&sav->sah->saidx.dst),
 382                     (u_long) ntohl(sav->spi),
 383                     skip + hlen + ralen, maxpacketsize));
 384                 error = EMSGSIZE;
 385                 goto bad;
 386         }
 387
 388         /* Update the counters */
 389         ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip;
 390
 391         m = m_clone(m);
 392         if (m == NULL) {
 393                 ipcompstat.ipcomps_hdrops++;
 394                 DPRINTF(("ipcomp_output: cannot clone mbuf chain, IPCA %s/%08lx\n",
 395                     ipsec_address(&sav->sah->saidx.dst),
 396                     (u_long) ntohl(sav->spi)));
 397                 error = ENOBUFS;
 398                 goto bad;
 399         }
 400
 401         /* Inject IPCOMP header */
 402         mo = m_makespace(m, skip, hlen, &roff);
 403         if (mo == NULL) {
 404                 ipcompstat.ipcomps_wrap++;
 405                 DPRINTF(("ipcomp_output: failed to inject IPCOMP header for "
 406                     "IPCA %s/%08lx\n",
 407                     ipsec_address(&sav->sah->saidx.dst),
 408                     (u_long) ntohl(sav->spi)));
 409                 error = ENOBUFS;
 410                 goto bad;
 411         }
 412         ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
 413
 414         /* Initialize the IPCOMP header */
 415         /* XXX alignment always correct? */
 416         switch (sav->sah->saidx.dst.sa.sa_family) {
 417 #ifdef INET
 418         case AF_INET:
 419                 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
 420                 break;
 421 #endif /* INET */
 422 #ifdef INET6
 423         case AF_INET6:
 424                 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
 425                 break;
 426 #endif
 427         }
 428         ipcomp->comp_flags = 0;
 429         ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
 430
 431         /* Fix Next Protocol in IPv4/IPv6 header */
 432         prot = IPPROTO_IPCOMP;
 433         m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot);
 434
 435         /* Ok now, we can pass to the crypto processing */
 436
 437         /* Get crypto descriptors */
 438         crp = crypto_getreq(1);
 439         if (crp == NULL) {
 440                 ipcompstat.ipcomps_crypto++;
 441                 DPRINTF(("ipcomp_output: failed to acquire crypto descriptor\n"));
 442                 error = ENOBUFS;
 443                 goto bad;
 444         }
 445         crdc = crp->crp_desc;
 446
 447         /* Compression descriptor */
 448         crdc->crd_skip = skip + hlen;
 449         crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
 450         crdc->crd_flags = CRD_F_COMP;
 451         crdc->crd_inject = skip + hlen;
 452
 453         /* Compression operation */
 454         crdc->crd_alg = ipcompx->type;
 455
 456         /* IPsec-specific opaque crypto info */
 457         tc = kmalloc(sizeof(struct tdb_crypto),
 458                     M_XDATA, M_INTWAIT | M_ZERO | M_NULLOK);
 459         if (tc == NULL) {
 460                 ipcompstat.ipcomps_crypto++;
 461                 DPRINTF(("ipcomp_output: failed to allocate tdb_crypto\n"));
 462                 crypto_freereq(crp);
 463                 error = ENOBUFS;
 464                 goto bad;
 465         }
 466
 467         tc->tc_isr = isr;
 468         tc->tc_spi = sav->spi;
 469         tc->tc_dst = sav->sah->saidx.dst;
 470         tc->tc_proto = sav->sah->saidx.proto;
 471         tc->tc_skip = skip + hlen;
 472
 473         /* Crypto operation descriptor */
 474         crp->crp_ilen = m->m_pkthdr.len;        /* Total input length */
 475         crp->crp_flags = CRYPTO_F_IMBUF;
 476         crp->crp_buf = (caddr_t) m;
 477         crp->crp_callback = ipcomp_output_cb;
 478         crp->crp_opaque = (caddr_t) tc;
 479         crp->crp_sid = sav->tdb_cryptoid;
 480
 481         return crypto_dispatch(crp);
 482 bad:
 483         if (m)
 484                 m_freem(m);
 485         return (error);
 486 }
 487
 488 /*
 489  * IPComp output callback from the crypto driver.
 490  */
 491 static int
 492 ipcomp_output_cb(struct cryptop *crp)
 493 {
 494         struct tdb_crypto *tc;
 495         struct ipsecrequest *isr;
 496         struct secasvar *sav;
 497         struct mbuf *m;
 498         int error, skip, rlen;
 499
 500         tc = (struct tdb_crypto *) crp->crp_opaque;
 501         KASSERT(tc != NULL, ("ipcomp_output_cb: null opaque data area!"));
 502         m = (struct mbuf *) crp->crp_buf;
 503         skip = tc->tc_skip;
 504         rlen = crp->crp_ilen - skip;
 505
 506         crit_enter();
 507
 508         isr = tc->tc_isr;
 509         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
 510         if (sav == NULL) {
 511                 ipcompstat.ipcomps_notdb++;
 512                 DPRINTF(("ipcomp_output_cb: SA expired while in crypto\n"));
 513                 error = ENOBUFS;                /*XXX*/
 514                 goto bad;
 515         }
 516         KASSERT(isr->sav == sav, ("ipcomp_output_cb: SA changed\n"));
 517
 518         /* Check for crypto errors */
 519         if (crp->crp_etype) {
 520                 /* Reset session ID */
 521                 if (sav->tdb_cryptoid != 0)
 522                         sav->tdb_cryptoid = crp->crp_sid;
 523
 524                 if (crp->crp_etype == EAGAIN) {
 525                         KEY_FREESAV(&sav);
 526                         crit_exit();
 527                         return crypto_dispatch(crp);
 528                 }
 529                 ipcompstat.ipcomps_noxform++;
 530                 DPRINTF(("ipcomp_output_cb: crypto error %d\n", crp->crp_etype));
 531                 error = crp->crp_etype;
 532                 goto bad;
 533         }
 534         /* Shouldn't happen... */
 535         if (m == NULL) {
 536                 ipcompstat.ipcomps_crypto++;
 537                 DPRINTF(("ipcomp_output_cb: bogus return buffer from crypto\n"));
 538                 error = EINVAL;
 539                 goto bad;
 540         }
 541         ipcompstat.ipcomps_hist[sav->alg_comp]++;
 542
 543         if (rlen > crp->crp_olen) {
 544                 /* Adjust the length in the IP header */
 545                 switch (sav->sah->saidx.dst.sa.sa_family) {
 546 #ifdef INET
 547                 case AF_INET:
 548                         mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
 549                         break;
 550 #endif /* INET */
 551 #ifdef INET6
 552                 case AF_INET6:
 553                         mtod(m, struct ip6_hdr *)->ip6_plen =
 554                                 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
 555                         break;
 556 #endif /* INET6 */
 557                 default:
 558                         ipcompstat.ipcomps_nopf++;
 559                         DPRINTF(("ipcomp_output: unknown/unsupported protocol "
 560                             "family %d, IPCA %s/%08lx\n",
 561                             sav->sah->saidx.dst.sa.sa_family,
 562                             ipsec_address(&sav->sah->saidx.dst),
 563                             (u_long) ntohl(sav->spi)));
 564                         error = EPFNOSUPPORT;
 565                         goto bad;
 566                 }
 567         } else {
 568                 /* compression was useless, we have lost time */
 569                 /* XXX add statistic */
 570         }
 571
 572         /* Release the crypto descriptor */
 573         kfree(tc, M_XDATA);
 574         crypto_freereq(crp);
 575
 576         /* NB: m is reclaimed by ipsec_process_done. */
 577         error = ipsec_process_done(m, isr);
 578         KEY_FREESAV(&sav);
 579         crit_exit();
 580         return error;
 581 bad:
 582         if (sav)
 583                 KEY_FREESAV(&sav);
 584         crit_exit();
 585         if (m)
 586                 m_freem(m);
 587         kfree(tc, M_XDATA);
 588         crypto_freereq(crp);
 589         return error;
 590 }
 591
 592 static struct xformsw ipcomp_xformsw = {
 593         XF_IPCOMP,              XFT_COMP,               "IPcomp",
 594         ipcomp_init,            ipcomp_zeroize,         ipcomp_input,
 595         ipcomp_output
 596 };
 597
 598 static void
 599 ipcomp_attach(void)
 600 {
 601         xform_register(&ipcomp_xformsw);
 602 }
 603 SYSINIT(ipcomp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipcomp_attach, NULL)