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