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 1.5 2004/10/15 22:59:10 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
  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         int hlen = IPCOMP_HLENGTH;
 142
 143         SPLASSERT(net, "ipcomp_input");
 144
 145         /* Get crypto descriptors */
 146         crp = crypto_getreq(1);
 147         if (crp == NULL) {
 148                 m_freem(m);
 149                 DPRINTF(("ipcomp_input: no crypto descriptors\n"));
 150                 ipcompstat.ipcomps_crypto++;
 151                 return ENOBUFS;
 152         }
 153         /* Get IPsec-specific opaque pointer */
 154         tc = malloc(sizeof (*tc), M_XDATA,
 155                     M_INTWAIT | M_ZERO | M_NULLOK);
 156         if (tc == NULL) {
 157                 m_freem(m);
 158                 crypto_freereq(crp);
 159                 DPRINTF(("ipcomp_input: cannot allocate tdb_crypto\n"));
 160                 ipcompstat.ipcomps_crypto++;
 161                 return ENOBUFS;
 162         }
 163         crdc = crp->crp_desc;
 164
 165         crdc->crd_skip = skip + hlen;
 166         crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
 167         crdc->crd_inject = skip;
 168
 169         tc->tc_ptr = 0;
 170
 171         /* Decompression operation */
 172         crdc->crd_alg = sav->tdb_compalgxform->type;
 173
 174         /* Crypto operation descriptor */
 175         crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
 176         crp->crp_flags = CRYPTO_F_IMBUF;
 177         crp->crp_buf = (caddr_t) m;
 178         crp->crp_callback = ipcomp_input_cb;
 179         crp->crp_sid = sav->tdb_cryptoid;
 180         crp->crp_opaque = (caddr_t) tc;
 181
 182         /* These are passed as-is to the callback */
 183         tc->tc_spi = sav->spi;
 184         tc->tc_dst = sav->sah->saidx.dst;
 185         tc->tc_proto = sav->sah->saidx.proto;
 186         tc->tc_protoff = protoff;
 187         tc->tc_skip = skip;
 188
 189         return crypto_dispatch(crp);
 190 }
 191
 192 #ifdef INET6
 193 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do {              \
 194         if (saidx->dst.sa.sa_family == AF_INET6) {                           \
 195                 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
 196         } else {                                                             \
 197                 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
 198         }                                                                    \
 199 } while (0)
 200 #else
 201 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag)                   \
 202         (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
 203 #endif
 204
 205 /*
 206  * IPComp input callback from the crypto driver.
 207  */
 208 static int
 209 ipcomp_input_cb(struct cryptop *crp)
 210 {
 211         struct cryptodesc *crd;
 212         struct tdb_crypto *tc;
 213         int skip, protoff;
 214         struct mtag *mtag;
 215         struct mbuf *m;
 216         struct secasvar *sav;
 217         struct secasindex *saidx;
 218         int s, hlen = IPCOMP_HLENGTH, error, clen;
 219         u_int8_t nproto;
 220         caddr_t addr;
 221
 222         crd = crp->crp_desc;
 223
 224         tc = (struct tdb_crypto *) crp->crp_opaque;
 225         KASSERT(tc != NULL, ("ipcomp_input_cb: null opaque crypto data area!"));
 226         skip = tc->tc_skip;
 227         protoff = tc->tc_protoff;
 228         mtag = (struct mtag *) tc->tc_ptr;
 229         m = (struct mbuf *) crp->crp_buf;
 230
 231         s = splnet();
 232
 233         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
 234         if (sav == NULL) {
 235                 ipcompstat.ipcomps_notdb++;
 236                 DPRINTF(("ipcomp_input_cb: SA expired while in crypto\n"));
 237                 error = ENOBUFS;                /*XXX*/
 238                 goto bad;
 239         }
 240
 241         saidx = &sav->sah->saidx;
 242         KASSERT(saidx->dst.sa.sa_family == AF_INET ||
 243                 saidx->dst.sa.sa_family == AF_INET6,
 244                 ("ah_input_cb: unexpected protocol family %u",
 245                  saidx->dst.sa.sa_family));
 246
 247         /* Check for crypto errors */
 248         if (crp->crp_etype) {
 249                 /* Reset the session ID */
 250                 if (sav->tdb_cryptoid != 0)
 251                         sav->tdb_cryptoid = crp->crp_sid;
 252
 253                 if (crp->crp_etype == EAGAIN) {
 254                         KEY_FREESAV(&sav);
 255                         splx(s);
 256                         return crypto_dispatch(crp);
 257                 }
 258
 259                 ipcompstat.ipcomps_noxform++;
 260                 DPRINTF(("ipcomp_input_cb: crypto error %d\n", crp->crp_etype));
 261                 error = crp->crp_etype;
 262                 goto bad;
 263         }
 264         /* Shouldn't happen... */
 265         if (m == NULL) {
 266                 ipcompstat.ipcomps_crypto++;
 267                 DPRINTF(("ipcomp_input_cb: null mbuf returned from crypto\n"));
 268                 error = EINVAL;
 269                 goto bad;
 270         }
 271         ipcompstat.ipcomps_hist[sav->alg_comp]++;
 272
 273         clen = crp->crp_olen;           /* Length of data after processing */
 274
 275         /* Release the crypto descriptors */
 276         free(tc, M_XDATA), tc = NULL;
 277         crypto_freereq(crp), crp = NULL;
 278
 279         /* In case it's not done already, adjust the size of the mbuf chain */
 280         m->m_pkthdr.len = clen + hlen + skip;
 281
 282         if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
 283                 ipcompstat.ipcomps_hdrops++;            /*XXX*/
 284                 DPRINTF(("ipcomp_input_cb: m_pullup failed\n"));
 285                 error = EINVAL;                         /*XXX*/
 286                 goto bad;
 287         }
 288
 289         /* Keep the next protocol field */
 290         addr = (caddr_t) mtod(m, struct ip *) + skip;
 291         nproto = ((struct ipcomp *) addr)->comp_nxt;
 292
 293         /* Remove the IPCOMP header */
 294         error = m_striphdr(m, skip, hlen);
 295         if (error) {
 296                 ipcompstat.ipcomps_hdrops++;
 297                 DPRINTF(("ipcomp_input_cb: bad mbuf chain, IPCA %s/%08lx\n",
 298                          ipsec_address(&sav->sah->saidx.dst),
 299                          (u_long) ntohl(sav->spi)));
 300                 goto bad;
 301         }
 302
 303         /* Restore the Next Protocol field */
 304         m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
 305
 306         IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
 307
 308         KEY_FREESAV(&sav);
 309         splx(s);
 310         return error;
 311 bad:
 312         if (sav)
 313                 KEY_FREESAV(&sav);
 314         splx(s);
 315         if (m)
 316                 m_freem(m);
 317         if (tc != NULL)
 318                 free(tc, M_XDATA);
 319         if (crp)
 320                 crypto_freereq(crp);
 321         return error;
 322 }
 323
 324 /*
 325  * IPComp output routine, called by ipsec[46]_process_packet()
 326  */
 327 static int
 328 ipcomp_output(
 329         struct mbuf *m,
 330         struct ipsecrequest *isr,
 331         struct mbuf **mp,
 332         int skip,
 333         int protoff
 334 )
 335 {
 336         struct secasvar *sav;
 337         struct comp_algo *ipcompx;
 338         int error, ralen, hlen, maxpacketsize, roff;
 339         u_int8_t prot;
 340         struct cryptodesc *crdc;
 341         struct cryptop *crp;
 342         struct tdb_crypto *tc;
 343         struct mbuf *mo;
 344         struct ipcomp *ipcomp;
 345
 346         SPLASSERT(net, "ipcomp_output");
 347
 348         sav = isr->sav;
 349         KASSERT(sav != NULL, ("ipcomp_output: null SA"));
 350         ipcompx = sav->tdb_compalgxform;
 351         KASSERT(ipcompx != NULL, ("ipcomp_output: null compression xform"));
 352
 353         ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
 354         hlen = IPCOMP_HLENGTH;
 355
 356         ipcompstat.ipcomps_output++;
 357
 358         /* Check for maximum packet size violations. */
 359         switch (sav->sah->saidx.dst.sa.sa_family) {
 360 #ifdef INET
 361         case AF_INET:
 362                 maxpacketsize =  IP_MAXPACKET;
 363                 break;
 364 #endif /* INET */
 365 #ifdef INET6
 366         case AF_INET6:
 367                 maxpacketsize =  IPV6_MAXPACKET;
 368                 break;
 369 #endif /* INET6 */
 370         default:
 371                 ipcompstat.ipcomps_nopf++;
 372                 DPRINTF(("ipcomp_output: unknown/unsupported protocol family %d"
 373                     ", IPCA %s/%08lx\n",
 374                     sav->sah->saidx.dst.sa.sa_family,
 375                     ipsec_address(&sav->sah->saidx.dst),
 376                     (u_long) ntohl(sav->spi)));
 377                 error = EPFNOSUPPORT;
 378                 goto bad;
 379         }
 380         if (skip + hlen + ralen > maxpacketsize) {
 381                 ipcompstat.ipcomps_toobig++;
 382                 DPRINTF(("ipcomp_output: packet in IPCA %s/%08lx got too big "
 383                     "(len %u, max len %u)\n",
 384                     ipsec_address(&sav->sah->saidx.dst),
 385                     (u_long) ntohl(sav->spi),
 386                     skip + hlen + ralen, maxpacketsize));
 387                 error = EMSGSIZE;
 388                 goto bad;
 389         }
 390
 391         /* Update the counters */
 392         ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip;
 393
 394         m = m_clone(m);
 395         if (m == NULL) {
 396                 ipcompstat.ipcomps_hdrops++;
 397                 DPRINTF(("ipcomp_output: cannot clone mbuf chain, IPCA %s/%08lx\n",
 398                     ipsec_address(&sav->sah->saidx.dst),
 399                     (u_long) ntohl(sav->spi)));
 400                 error = ENOBUFS;
 401                 goto bad;
 402         }
 403
 404         /* Inject IPCOMP header */
 405         mo = m_makespace(m, skip, hlen, &roff);
 406         if (mo == NULL) {
 407                 ipcompstat.ipcomps_wrap++;
 408                 DPRINTF(("ipcomp_output: failed to inject IPCOMP header for "
 409                     "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         ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
 416
 417         /* Initialize the IPCOMP header */
 418         /* XXX alignment always correct? */
 419         switch (sav->sah->saidx.dst.sa.sa_family) {
 420 #ifdef INET
 421         case AF_INET:
 422                 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
 423                 break;
 424 #endif /* INET */
 425 #ifdef INET6
 426         case AF_INET6:
 427                 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
 428                 break;
 429 #endif
 430         }
 431         ipcomp->comp_flags = 0;
 432         ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
 433
 434         /* Fix Next Protocol in IPv4/IPv6 header */
 435         prot = IPPROTO_IPCOMP;
 436         m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot);
 437
 438         /* Ok now, we can pass to the crypto processing */
 439
 440         /* Get crypto descriptors */
 441         crp = crypto_getreq(1);
 442         if (crp == NULL) {
 443                 ipcompstat.ipcomps_crypto++;
 444                 DPRINTF(("ipcomp_output: failed to acquire crypto descriptor\n"));
 445                 error = ENOBUFS;
 446                 goto bad;
 447         }
 448         crdc = crp->crp_desc;
 449
 450         /* Compression descriptor */
 451         crdc->crd_skip = skip + hlen;
 452         crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
 453         crdc->crd_flags = CRD_F_COMP;
 454         crdc->crd_inject = skip + hlen;
 455
 456         /* Compression operation */
 457         crdc->crd_alg = ipcompx->type;
 458
 459         /* IPsec-specific opaque crypto info */
 460         tc = malloc(sizeof(struct tdb_crypto),
 461                     M_XDATA, M_INTWAIT | M_ZERO | M_NULLOK);
 462         if (tc == NULL) {
 463                 ipcompstat.ipcomps_crypto++;
 464                 DPRINTF(("ipcomp_output: failed to allocate tdb_crypto\n"));
 465                 crypto_freereq(crp);
 466                 error = ENOBUFS;
 467                 goto bad;
 468         }
 469
 470         tc->tc_isr = isr;
 471         tc->tc_spi = sav->spi;
 472         tc->tc_dst = sav->sah->saidx.dst;
 473         tc->tc_proto = sav->sah->saidx.proto;
 474         tc->tc_skip = skip + hlen;
 475
 476         /* Crypto operation descriptor */
 477         crp->crp_ilen = m->m_pkthdr.len;        /* Total input length */
 478         crp->crp_flags = CRYPTO_F_IMBUF;
 479         crp->crp_buf = (caddr_t) m;
 480         crp->crp_callback = ipcomp_output_cb;
 481         crp->crp_opaque = (caddr_t) tc;
 482         crp->crp_sid = sav->tdb_cryptoid;
 483
 484         return crypto_dispatch(crp);
 485 bad:
 486         if (m)
 487                 m_freem(m);
 488         return (error);
 489 }
 490
 491 /*
 492  * IPComp output callback from the crypto driver.
 493  */
 494 static int
 495 ipcomp_output_cb(struct cryptop *crp)
 496 {
 497         struct tdb_crypto *tc;
 498         struct ipsecrequest *isr;
 499         struct secasvar *sav;
 500         struct mbuf *m;
 501         int s, error, skip, rlen;
 502
 503         tc = (struct tdb_crypto *) crp->crp_opaque;
 504         KASSERT(tc != NULL, ("ipcomp_output_cb: null opaque data area!"));
 505         m = (struct mbuf *) crp->crp_buf;
 506         skip = tc->tc_skip;
 507         rlen = crp->crp_ilen - skip;
 508
 509         s = splnet();
 510
 511         isr = tc->tc_isr;
 512         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
 513         if (sav == NULL) {
 514                 ipcompstat.ipcomps_notdb++;
 515                 DPRINTF(("ipcomp_output_cb: SA expired while in crypto\n"));
 516                 error = ENOBUFS;                /*XXX*/
 517                 goto bad;
 518         }
 519         KASSERT(isr->sav == sav, ("ipcomp_output_cb: SA changed\n"));
 520
 521         /* Check for crypto errors */
 522         if (crp->crp_etype) {
 523                 /* Reset session ID */
 524                 if (sav->tdb_cryptoid != 0)
 525                         sav->tdb_cryptoid = crp->crp_sid;
 526
 527                 if (crp->crp_etype == EAGAIN) {
 528                         KEY_FREESAV(&sav);
 529                         splx(s);
 530                         return crypto_dispatch(crp);
 531                 }
 532                 ipcompstat.ipcomps_noxform++;
 533                 DPRINTF(("ipcomp_output_cb: crypto error %d\n", crp->crp_etype));
 534                 error = crp->crp_etype;
 535                 goto bad;
 536         }
 537         /* Shouldn't happen... */
 538         if (m == NULL) {
 539                 ipcompstat.ipcomps_crypto++;
 540                 DPRINTF(("ipcomp_output_cb: bogus return buffer from crypto\n"));
 541                 error = EINVAL;
 542                 goto bad;
 543         }
 544         ipcompstat.ipcomps_hist[sav->alg_comp]++;
 545
 546         if (rlen > crp->crp_olen) {
 547                 /* Adjust the length in the IP header */
 548                 switch (sav->sah->saidx.dst.sa.sa_family) {
 549 #ifdef INET
 550                 case AF_INET:
 551                         mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
 552                         break;
 553 #endif /* INET */
 554 #ifdef INET6
 555                 case AF_INET6:
 556                         mtod(m, struct ip6_hdr *)->ip6_plen =
 557                                 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
 558                         break;
 559 #endif /* INET6 */
 560                 default:
 561                         ipcompstat.ipcomps_nopf++;
 562                         DPRINTF(("ipcomp_output: unknown/unsupported protocol "
 563                             "family %d, IPCA %s/%08lx\n",
 564                             sav->sah->saidx.dst.sa.sa_family,
 565                             ipsec_address(&sav->sah->saidx.dst),
 566                             (u_long) ntohl(sav->spi)));
 567                         error = EPFNOSUPPORT;
 568                         goto bad;
 569                 }
 570         } else {
 571                 /* compression was useless, we have lost time */
 572                 /* XXX add statistic */
 573         }
 574
 575         /* Release the crypto descriptor */
 576         free(tc, M_XDATA);
 577         crypto_freereq(crp);
 578
 579         /* NB: m is reclaimed by ipsec_process_done. */
 580         error = ipsec_process_done(m, isr);
 581         KEY_FREESAV(&sav);
 582         splx(s);
 583         return error;
 584 bad:
 585         if (sav)
 586                 KEY_FREESAV(&sav);
 587         splx(s);
 588         if (m)
 589                 m_freem(m);
 590         free(tc, M_XDATA);
 591         crypto_freereq(crp);
 592         return error;
 593 }
 594
 595 static struct xformsw ipcomp_xformsw = {
 596         XF_IPCOMP,              XFT_COMP,               "IPcomp",
 597         ipcomp_init,            ipcomp_zeroize,         ipcomp_input,
 598         ipcomp_output
 599 };
 600
 601 static void
 602 ipcomp_attach(void)
 603 {
 604         xform_register(&ipcomp_xformsw);
 605 }
 606 SYSINIT(ipcomp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipcomp_attach, NULL)