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