The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/netipsec/xform_ipcomp.c

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    1 /*      $FreeBSD: releng/10.1/sys/netipsec/xform_ipcomp.c 253088 2013-07-09 10:08:13Z ae $      */
    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);

Cache object: 05e371f0507a7e769e6ac9794f7e5b65


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