sys/netipsec/xform_ipcomp.c

   1 /*      $FreeBSD$       */
   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/lock.h>
  39 #include <sys/mutex.h>
  40 #include <sys/rwlock.h>
  41 #include <sys/socket.h>
  42 #include <sys/kernel.h>
  43 #include <sys/protosw.h>
  44 #include <sys/sysctl.h>
  45
  46 #include <netinet/in.h>
  47 #include <netinet/in_systm.h>
  48 #include <netinet/ip.h>
  49 #include <netinet/ip_var.h>
  50
  51 #include <net/route.h>
  52 #include <net/vnet.h>
  53
  54 #include <netipsec/ipsec.h>
  55 #include <netipsec/xform.h>
  56
  57 #ifdef INET6
  58 #include <netinet/ip6.h>
  59 #include <netipsec/ipsec6.h>
  60 #endif
  61
  62 #include <netipsec/ipcomp.h>
  63 #include <netipsec/ipcomp_var.h>
  64
  65 #include <netipsec/key.h>
  66 #include <netipsec/key_debug.h>
  67
  68 #include <opencrypto/cryptodev.h>
  69 #include <opencrypto/deflate.h>
  70 #include <opencrypto/xform.h>
  71
  72 VNET_DEFINE(int, ipcomp_enable) = 1;
  73 VNET_DEFINE(struct ipcompstat, ipcompstat);
  74
  75 SYSCTL_DECL(_net_inet_ipcomp);
  76 SYSCTL_VNET_INT(_net_inet_ipcomp, OID_AUTO,
  77         ipcomp_enable,  CTLFLAG_RW,     &VNET_NAME(ipcomp_enable),      0, "");
  78 SYSCTL_VNET_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS,
  79         stats,          CTLFLAG_RD,     &VNET_NAME(ipcompstat), ipcompstat, "");
  80
  81 static int ipcomp_input_cb(struct cryptop *crp);
  82 static int ipcomp_output_cb(struct cryptop *crp);
  83
  84 struct comp_algo *
  85 ipcomp_algorithm_lookup(int alg)
  86 {
  87         if (alg >= IPCOMP_ALG_MAX)
  88                 return NULL;
  89         switch (alg) {
  90         case SADB_X_CALG_DEFLATE:
  91                 return &comp_algo_deflate;
  92         }
  93         return NULL;
  94 }
  95
  96 /*
  97  * ipcomp_init() is called when an CPI is being set up.
  98  */
  99 static int
 100 ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
 101 {
 102         struct comp_algo *tcomp;
 103         struct cryptoini cric;
 104
 105         /* NB: algorithm really comes in alg_enc and not alg_comp! */
 106         tcomp = ipcomp_algorithm_lookup(sav->alg_enc);
 107         if (tcomp == NULL) {
 108                 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__,
 109                          sav->alg_comp));
 110                 return EINVAL;
 111         }
 112         sav->alg_comp = sav->alg_enc;           /* set for doing histogram */
 113         sav->tdb_xform = xsp;
 114         sav->tdb_compalgxform = tcomp;
 115
 116         /* Initialize crypto session */
 117         bzero(&cric, sizeof (cric));
 118         cric.cri_alg = sav->tdb_compalgxform->type;
 119
 120         return crypto_newsession(&sav->tdb_cryptoid, &cric, V_crypto_support);
 121 }
 122
 123 /*
 124  * ipcomp_zeroize() used when IPCA is deleted
 125  */
 126 static int
 127 ipcomp_zeroize(struct secasvar *sav)
 128 {
 129         int err;
 130
 131         err = crypto_freesession(sav->tdb_cryptoid);
 132         sav->tdb_cryptoid = 0;
 133         return err;
 134 }
 135
 136 /*
 137  * ipcomp_input() gets called to uncompress an input packet
 138  */
 139 static int
 140 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
 141 {
 142         struct tdb_crypto *tc;
 143         struct cryptodesc *crdc;
 144         struct cryptop *crp;
 145         struct ipcomp *ipcomp;
 146         caddr_t addr;
 147         int hlen = IPCOMP_HLENGTH;
 148
 149         /*
 150          * Check that the next header of the IPComp is not IPComp again, before
 151          * doing any real work.  Given it is not possible to do double
 152          * compression it means someone is playing tricks on us.
 153          */
 154         if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
 155                 V_ipcompstat.ipcomps_hdrops++;          /*XXX*/
 156                 DPRINTF(("%s: m_pullup failed\n", __func__));
 157                 return (ENOBUFS);
 158         }
 159         addr = (caddr_t) mtod(m, struct ip *) + skip;
 160         ipcomp = (struct ipcomp *)addr;
 161         if (ipcomp->comp_nxt == IPPROTO_IPCOMP) {
 162                 m_freem(m);
 163                 V_ipcompstat.ipcomps_pdrops++;  /* XXX have our own stats? */
 164                 DPRINTF(("%s: recursive compression detected\n", __func__));
 165                 return (EINVAL);
 166         }
 167
 168         /* Get crypto descriptors */
 169         crp = crypto_getreq(1);
 170         if (crp == NULL) {
 171                 m_freem(m);
 172                 DPRINTF(("%s: no crypto descriptors\n", __func__));
 173                 V_ipcompstat.ipcomps_crypto++;
 174                 return ENOBUFS;
 175         }
 176         /* Get IPsec-specific opaque pointer */
 177         tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO);
 178         if (tc == NULL) {
 179                 m_freem(m);
 180                 crypto_freereq(crp);
 181                 DPRINTF(("%s: cannot allocate tdb_crypto\n", __func__));
 182                 V_ipcompstat.ipcomps_crypto++;
 183                 return ENOBUFS;
 184         }
 185         crdc = crp->crp_desc;
 186
 187         crdc->crd_skip = skip + hlen;
 188         crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
 189         crdc->crd_inject = skip;
 190
 191         tc->tc_ptr = 0;
 192
 193         /* Decompression operation */
 194         crdc->crd_alg = sav->tdb_compalgxform->type;
 195
 196         /* Crypto operation descriptor */
 197         crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
 198         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
 199         crp->crp_buf = (caddr_t) m;
 200         crp->crp_callback = ipcomp_input_cb;
 201         crp->crp_sid = sav->tdb_cryptoid;
 202         crp->crp_opaque = (caddr_t) tc;
 203
 204         /* These are passed as-is to the callback */
 205         tc->tc_spi = sav->spi;
 206         tc->tc_dst = sav->sah->saidx.dst;
 207         tc->tc_proto = sav->sah->saidx.proto;
 208         tc->tc_protoff = protoff;
 209         tc->tc_skip = skip;
 210         KEY_ADDREFSA(sav);
 211         tc->tc_sav = sav;
 212
 213         return crypto_dispatch(crp);
 214 }
 215
 216 #ifdef INET6
 217 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do {              \
 218         if (saidx->dst.sa.sa_family == AF_INET6) {                           \
 219                 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
 220         } else {                                                             \
 221                 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
 222         }                                                                    \
 223 } while (0)
 224 #else
 225 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag)                   \
 226         (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
 227 #endif
 228
 229 /*
 230  * IPComp input callback from the crypto driver.
 231  */
 232 static int
 233 ipcomp_input_cb(struct cryptop *crp)
 234 {
 235         struct cryptodesc *crd;
 236         struct tdb_crypto *tc;
 237         int skip, protoff;
 238         struct mtag *mtag;
 239         struct mbuf *m;
 240         struct secasvar *sav;
 241         struct secasindex *saidx;
 242         int hlen = IPCOMP_HLENGTH, error, clen;
 243         u_int8_t nproto;
 244         caddr_t addr;
 245
 246         crd = crp->crp_desc;
 247
 248         tc = (struct tdb_crypto *) crp->crp_opaque;
 249         IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!"));
 250         skip = tc->tc_skip;
 251         protoff = tc->tc_protoff;
 252         mtag = (struct mtag *) tc->tc_ptr;
 253         m = (struct mbuf *) crp->crp_buf;
 254
 255         sav = tc->tc_sav;
 256         IPSEC_ASSERT(sav != NULL, ("null SA!"));
 257
 258         saidx = &sav->sah->saidx;
 259         IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
 260                 saidx->dst.sa.sa_family == AF_INET6,
 261                 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
 262
 263         /* Check for crypto errors */
 264         if (crp->crp_etype) {
 265                 /* Reset the session ID */
 266                 if (sav->tdb_cryptoid != 0)
 267                         sav->tdb_cryptoid = crp->crp_sid;
 268
 269                 if (crp->crp_etype == EAGAIN) {
 270                         return crypto_dispatch(crp);
 271                 }
 272                 V_ipcompstat.ipcomps_noxform++;
 273                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
 274                 error = crp->crp_etype;
 275                 goto bad;
 276         }
 277         /* Shouldn't happen... */
 278         if (m == NULL) {
 279                 V_ipcompstat.ipcomps_crypto++;
 280                 DPRINTF(("%s: null mbuf returned from crypto\n", __func__));
 281                 error = EINVAL;
 282                 goto bad;
 283         }
 284         V_ipcompstat.ipcomps_hist[sav->alg_comp]++;
 285
 286         clen = crp->crp_olen;           /* Length of data after processing */
 287
 288         /* Release the crypto descriptors */
 289         free(tc, M_XDATA), tc = NULL;
 290         crypto_freereq(crp), crp = NULL;
 291
 292         /* In case it's not done already, adjust the size of the mbuf chain */
 293         m->m_pkthdr.len = clen + hlen + skip;
 294
 295         if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
 296                 V_ipcompstat.ipcomps_hdrops++;          /*XXX*/
 297                 DPRINTF(("%s: m_pullup failed\n", __func__));
 298                 error = EINVAL;                         /*XXX*/
 299                 goto bad;
 300         }
 301
 302         /* Keep the next protocol field */
 303         addr = (caddr_t) mtod(m, struct ip *) + skip;
 304         nproto = ((struct ipcomp *) addr)->comp_nxt;
 305
 306         /* Remove the IPCOMP header */
 307         error = m_striphdr(m, skip, hlen);
 308         if (error) {
 309                 V_ipcompstat.ipcomps_hdrops++;
 310                 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__,
 311                          ipsec_address(&sav->sah->saidx.dst),
 312                          (u_long) ntohl(sav->spi)));
 313                 goto bad;
 314         }
 315
 316         /* Restore the Next Protocol field */
 317         m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
 318
 319         IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
 320
 321         KEY_FREESAV(&sav);
 322         return error;
 323 bad:
 324         if (sav)
 325                 KEY_FREESAV(&sav);
 326         if (m)
 327                 m_freem(m);
 328         if (tc != NULL)
 329                 free(tc, M_XDATA);
 330         if (crp)
 331                 crypto_freereq(crp);
 332         return error;
 333 }
 334
 335 /*
 336  * IPComp output routine, called by ipsec[46]_process_packet()
 337  */
 338 static int
 339 ipcomp_output(
 340         struct mbuf *m,
 341         struct ipsecrequest *isr,
 342         struct mbuf **mp,
 343         int skip,
 344         int protoff
 345 )
 346 {
 347         struct secasvar *sav;
 348         struct comp_algo *ipcompx;
 349         int error, ralen, maxpacketsize;
 350         struct cryptodesc *crdc;
 351         struct cryptop *crp;
 352         struct tdb_crypto *tc;
 353
 354         sav = isr->sav;
 355         IPSEC_ASSERT(sav != NULL, ("null SA"));
 356         ipcompx = sav->tdb_compalgxform;
 357         IPSEC_ASSERT(ipcompx != NULL, ("null compression xform"));
 358
 359         /*
 360          * Do not touch the packet in case our payload to compress
 361          * is lower than the minimal threshold of the compression
 362          * alogrithm.  We will just send out the data uncompressed.
 363          * See RFC 3173, 2.2. Non-Expansion Policy.
 364          */
 365         if (m->m_pkthdr.len <= ipcompx->minlen) {
 366                 V_ipcompstat.ipcomps_threshold++;
 367                 return ipsec_process_done(m, isr);
 368         }
 369
 370         ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
 371         V_ipcompstat.ipcomps_output++;
 372
 373         /* Check for maximum packet size violations. */
 374         switch (sav->sah->saidx.dst.sa.sa_family) {
 375 #ifdef INET
 376         case AF_INET:
 377                 maxpacketsize = IP_MAXPACKET;
 378                 break;
 379 #endif /* INET */
 380 #ifdef INET6
 381         case AF_INET6:
 382                 maxpacketsize = IPV6_MAXPACKET;
 383                 break;
 384 #endif /* INET6 */
 385         default:
 386                 V_ipcompstat.ipcomps_nopf++;
 387                 DPRINTF(("%s: unknown/unsupported protocol family %d, "
 388                     "IPCA %s/%08lx\n", __func__,
 389                     sav->sah->saidx.dst.sa.sa_family,
 390                     ipsec_address(&sav->sah->saidx.dst),
 391                     (u_long) ntohl(sav->spi)));
 392                 error = EPFNOSUPPORT;
 393                 goto bad;
 394         }
 395         if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) {
 396                 V_ipcompstat.ipcomps_toobig++;
 397                 DPRINTF(("%s: packet in IPCA %s/%08lx got too big "
 398                     "(len %u, max len %u)\n", __func__,
 399                     ipsec_address(&sav->sah->saidx.dst),
 400                     (u_long) ntohl(sav->spi),
 401                     ralen + skip + IPCOMP_HLENGTH, maxpacketsize));
 402                 error = EMSGSIZE;
 403                 goto bad;
 404         }
 405
 406         /* Update the counters */
 407         V_ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip;
 408
 409         m = m_unshare(m, M_NOWAIT);
 410         if (m == NULL) {
 411                 V_ipcompstat.ipcomps_hdrops++;
 412                 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n",
 413                     __func__, ipsec_address(&sav->sah->saidx.dst),
 414                     (u_long) ntohl(sav->spi)));
 415                 error = ENOBUFS;
 416                 goto bad;
 417         }
 418
 419         /* Ok now, we can pass to the crypto processing. */
 420
 421         /* Get crypto descriptors */
 422         crp = crypto_getreq(1);
 423         if (crp == NULL) {
 424                 V_ipcompstat.ipcomps_crypto++;
 425                 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
 426                 error = ENOBUFS;
 427                 goto bad;
 428         }
 429         crdc = crp->crp_desc;
 430
 431         /* Compression descriptor */
 432         crdc->crd_skip = skip;
 433         crdc->crd_len = ralen;
 434         crdc->crd_flags = CRD_F_COMP;
 435         crdc->crd_inject = skip;
 436
 437         /* Compression operation */
 438         crdc->crd_alg = ipcompx->type;
 439
 440         /* IPsec-specific opaque crypto info */
 441         tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
 442                 M_XDATA, M_NOWAIT|M_ZERO);
 443         if (tc == NULL) {
 444                 V_ipcompstat.ipcomps_crypto++;
 445                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
 446                 crypto_freereq(crp);
 447                 error = ENOBUFS;
 448                 goto bad;
 449         }
 450
 451         tc->tc_isr = isr;
 452         KEY_ADDREFSA(sav);
 453         tc->tc_sav = sav;
 454         tc->tc_spi = sav->spi;
 455         tc->tc_dst = sav->sah->saidx.dst;
 456         tc->tc_proto = sav->sah->saidx.proto;
 457         tc->tc_protoff = protoff;
 458         tc->tc_skip = skip;
 459
 460         /* Crypto operation descriptor */
 461         crp->crp_ilen = m->m_pkthdr.len;        /* Total input length */
 462         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
 463         crp->crp_buf = (caddr_t) m;
 464         crp->crp_callback = ipcomp_output_cb;
 465         crp->crp_opaque = (caddr_t) tc;
 466         crp->crp_sid = sav->tdb_cryptoid;
 467
 468         return crypto_dispatch(crp);
 469 bad:
 470         if (m)
 471                 m_freem(m);
 472         return (error);
 473 }
 474
 475 /*
 476  * IPComp output callback from the crypto driver.
 477  */
 478 static int
 479 ipcomp_output_cb(struct cryptop *crp)
 480 {
 481         struct tdb_crypto *tc;
 482         struct ipsecrequest *isr;
 483         struct secasvar *sav;
 484         struct mbuf *m;
 485         int error, skip;
 486
 487         tc = (struct tdb_crypto *) crp->crp_opaque;
 488         IPSEC_ASSERT(tc != NULL, ("null opaque data area!"));
 489         m = (struct mbuf *) crp->crp_buf;
 490         skip = tc->tc_skip;
 491
 492         isr = tc->tc_isr;
 493         IPSECREQUEST_LOCK(isr);
 494         sav = tc->tc_sav;
 495         /* With the isr lock released SA pointer can be updated. */
 496         if (sav != isr->sav) {
 497                 V_ipcompstat.ipcomps_notdb++;
 498                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
 499                 error = ENOBUFS;                /*XXX*/
 500                 goto bad;
 501         }
 502
 503         /* Check for crypto errors */
 504         if (crp->crp_etype) {
 505                 /* Reset the session ID */
 506                 if (sav->tdb_cryptoid != 0)
 507                         sav->tdb_cryptoid = crp->crp_sid;
 508
 509                 if (crp->crp_etype == EAGAIN) {
 510                         IPSECREQUEST_UNLOCK(isr);
 511                         return crypto_dispatch(crp);
 512                 }
 513                 V_ipcompstat.ipcomps_noxform++;
 514                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
 515                 error = crp->crp_etype;
 516                 goto bad;
 517         }
 518         /* Shouldn't happen... */
 519         if (m == NULL) {
 520                 V_ipcompstat.ipcomps_crypto++;
 521                 DPRINTF(("%s: bogus return buffer from crypto\n", __func__));
 522                 error = EINVAL;
 523                 goto bad;
 524         }
 525         V_ipcompstat.ipcomps_hist[sav->alg_comp]++;
 526
 527         if (crp->crp_ilen - skip > crp->crp_olen) {
 528                 struct mbuf *mo;
 529                 struct ipcomp *ipcomp;
 530                 int roff;
 531                 uint8_t prot;
 532
 533                 /* Compression helped, inject IPCOMP header. */
 534                 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
 535                 if (mo == NULL) {
 536                         V_ipcompstat.ipcomps_wrap++;
 537                         DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n",
 538                             __func__, ipsec_address(&sav->sah->saidx.dst),
 539                             (u_long) ntohl(sav->spi)));
 540                         error = ENOBUFS;
 541                         goto bad;
 542                 }
 543                 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
 544
 545                 /* Initialize the IPCOMP header */
 546                 /* XXX alignment always correct? */
 547                 switch (sav->sah->saidx.dst.sa.sa_family) {
 548 #ifdef INET
 549                 case AF_INET:
 550                         ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
 551                         break;
 552 #endif /* INET */
 553 #ifdef INET6
 554                 case AF_INET6:
 555                         ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
 556                         break;
 557 #endif
 558                 }
 559                 ipcomp->comp_flags = 0;
 560                 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
 561
 562                 /* Fix Next Protocol in IPv4/IPv6 header */
 563                 prot = IPPROTO_IPCOMP;
 564                 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t),
 565                     (u_char *)&prot);
 566
 567                 /* Adjust the length in the IP header */
 568                 switch (sav->sah->saidx.dst.sa.sa_family) {
 569 #ifdef INET
 570                 case AF_INET:
 571                         mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
 572                         break;
 573 #endif /* INET */
 574 #ifdef INET6
 575                 case AF_INET6:
 576                         mtod(m, struct ip6_hdr *)->ip6_plen =
 577                                 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
 578                         break;
 579 #endif /* INET6 */
 580                 default:
 581                         V_ipcompstat.ipcomps_nopf++;
 582                         DPRINTF(("%s: unknown/unsupported protocol "
 583                             "family %d, IPCA %s/%08lx\n", __func__,
 584                             sav->sah->saidx.dst.sa.sa_family,
 585                             ipsec_address(&sav->sah->saidx.dst),
 586                             (u_long) ntohl(sav->spi)));
 587                         error = EPFNOSUPPORT;
 588                         goto bad;
 589                 }
 590         } else {
 591                 /* Compression was useless, we have lost time. */
 592                 V_ipcompstat.ipcomps_uncompr++;
 593                 DPRINTF(("%s: compressions was useless %d - %d <= %d\n",
 594                     __func__, crp->crp_ilen, skip, crp->crp_olen));
 595                 /* XXX remember state to not compress the next couple
 596                  *     of packets, RFC 3173, 2.2. Non-Expansion Policy */
 597         }
 598
 599         /* Release the crypto descriptor */
 600         free(tc, M_XDATA);
 601         crypto_freereq(crp);
 602
 603         /* NB: m is reclaimed by ipsec_process_done. */
 604         error = ipsec_process_done(m, isr);
 605         KEY_FREESAV(&sav);
 606         IPSECREQUEST_UNLOCK(isr);
 607         return error;
 608 bad:
 609         if (sav)
 610                 KEY_FREESAV(&sav);
 611         IPSECREQUEST_UNLOCK(isr);
 612         if (m)
 613                 m_freem(m);
 614         free(tc, M_XDATA);
 615         crypto_freereq(crp);
 616         return error;
 617 }
 618
 619 static struct xformsw ipcomp_xformsw = {
 620         XF_IPCOMP,              XFT_COMP,               "IPcomp",
 621         ipcomp_init,            ipcomp_zeroize,         ipcomp_input,
 622         ipcomp_output
 623 };
 624
 625 static void
 626 ipcomp_attach(void)
 627 {
 628
 629         xform_register(&ipcomp_xformsw);
 630 }
 631
 632 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL);
 633
 634 static void
 635 vnet_ipcomp_attach(const void *unused __unused)
 636 {
 637
 638         V_ipcompstat.version = IPCOMPSTAT_VERSION;
 639 }
 640
 641 VNET_SYSINIT(vnet_ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
 642     vnet_ipcomp_attach, NULL);