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

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    1 /*      $FreeBSD: releng/9.2/sys/netipsec/xform_ipcomp.c 252693 2013-07-04 08:59:34Z 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_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                 IPCOMPSTAT_INC(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                 IPCOMPSTAT_INC(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                 IPCOMPSTAT_INC(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                 IPCOMPSTAT_INC(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 /*
  217  * IPComp input callback from the crypto driver.
  218  */
  219 static int
  220 ipcomp_input_cb(struct cryptop *crp)
  221 {
  222         struct cryptodesc *crd;
  223         struct tdb_crypto *tc;
  224         int skip, protoff;
  225         struct mtag *mtag;
  226         struct mbuf *m;
  227         struct secasvar *sav;
  228         struct secasindex *saidx;
  229         int hlen = IPCOMP_HLENGTH, error, clen;
  230         u_int8_t nproto;
  231         caddr_t addr;
  232 
  233         crd = crp->crp_desc;
  234 
  235         tc = (struct tdb_crypto *) crp->crp_opaque;
  236         IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!"));
  237         skip = tc->tc_skip;
  238         protoff = tc->tc_protoff;
  239         mtag = (struct mtag *) tc->tc_ptr;
  240         m = (struct mbuf *) crp->crp_buf;
  241 
  242         sav = tc->tc_sav;
  243         IPSEC_ASSERT(sav != NULL, ("null SA!"));
  244 
  245         saidx = &sav->sah->saidx;
  246         IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
  247                 saidx->dst.sa.sa_family == AF_INET6,
  248                 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
  249 
  250         /* Check for crypto errors */
  251         if (crp->crp_etype) {
  252                 /* Reset the session ID */
  253                 if (sav->tdb_cryptoid != 0)
  254                         sav->tdb_cryptoid = crp->crp_sid;
  255 
  256                 if (crp->crp_etype == EAGAIN) {
  257                         return crypto_dispatch(crp);
  258                 }
  259                 IPCOMPSTAT_INC(ipcomps_noxform);
  260                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  261                 error = crp->crp_etype;
  262                 goto bad;
  263         }
  264         /* Shouldn't happen... */
  265         if (m == NULL) {
  266                 IPCOMPSTAT_INC(ipcomps_crypto);
  267                 DPRINTF(("%s: null mbuf returned from crypto\n", __func__));
  268                 error = EINVAL;
  269                 goto bad;
  270         }
  271         IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
  272 
  273         clen = crp->crp_olen;           /* Length of data after processing */
  274 
  275         /* Release the crypto descriptors */
  276         free(tc, M_XDATA), tc = NULL;
  277         crypto_freereq(crp), crp = NULL;
  278 
  279         /* In case it's not done already, adjust the size of the mbuf chain */
  280         m->m_pkthdr.len = clen + hlen + skip;
  281 
  282         if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
  283                 IPCOMPSTAT_INC(ipcomps_hdrops);         /*XXX*/
  284                 DPRINTF(("%s: m_pullup failed\n", __func__));
  285                 error = EINVAL;                         /*XXX*/
  286                 goto bad;
  287         }
  288 
  289         /* Keep the next protocol field */
  290         addr = (caddr_t) mtod(m, struct ip *) + skip;
  291         nproto = ((struct ipcomp *) addr)->comp_nxt;
  292 
  293         /* Remove the IPCOMP header */
  294         error = m_striphdr(m, skip, hlen);
  295         if (error) {
  296                 IPCOMPSTAT_INC(ipcomps_hdrops);
  297                 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__,
  298                          ipsec_address(&sav->sah->saidx.dst),
  299                          (u_long) ntohl(sav->spi)));
  300                 goto bad;
  301         }
  302 
  303         /* Restore the Next Protocol field */
  304         m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
  305 
  306         switch (saidx->dst.sa.sa_family) {
  307 #ifdef INET6
  308         case AF_INET6:
  309                 error = ipsec6_common_input_cb(m, sav, skip, protoff, NULL);
  310                 break;
  311 #endif
  312 #ifdef INET
  313         case AF_INET:
  314                 error = ipsec4_common_input_cb(m, sav, skip, protoff, NULL);
  315                 break;
  316 #endif
  317         default:
  318                 panic("%s: Unexpected address family: %d saidx=%p", __func__,
  319                     saidx->dst.sa.sa_family, saidx);
  320         }
  321 
  322         KEY_FREESAV(&sav);
  323         return error;
  324 bad:
  325         if (sav)
  326                 KEY_FREESAV(&sav);
  327         if (m)
  328                 m_freem(m);
  329         if (tc != NULL)
  330                 free(tc, M_XDATA);
  331         if (crp)
  332                 crypto_freereq(crp);
  333         return error;
  334 }
  335 
  336 /*
  337  * IPComp output routine, called by ipsec[46]_process_packet()
  338  */
  339 static int
  340 ipcomp_output(
  341         struct mbuf *m,
  342         struct ipsecrequest *isr,
  343         struct mbuf **mp,
  344         int skip,
  345         int protoff
  346 )
  347 {
  348         struct secasvar *sav;
  349         struct comp_algo *ipcompx;
  350         int error, ralen, maxpacketsize;
  351         struct cryptodesc *crdc;
  352         struct cryptop *crp;
  353         struct tdb_crypto *tc;
  354 
  355         sav = isr->sav;
  356         IPSEC_ASSERT(sav != NULL, ("null SA"));
  357         ipcompx = sav->tdb_compalgxform;
  358         IPSEC_ASSERT(ipcompx != NULL, ("null compression xform"));
  359 
  360         /*
  361          * Do not touch the packet in case our payload to compress
  362          * is lower than the minimal threshold of the compression
  363          * alogrithm.  We will just send out the data uncompressed.
  364          * See RFC 3173, 2.2. Non-Expansion Policy.
  365          */
  366         if (m->m_pkthdr.len <= ipcompx->minlen) {
  367                 IPCOMPSTAT_INC(ipcomps_threshold);
  368                 return ipsec_process_done(m, isr);
  369         }
  370 
  371         ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
  372         IPCOMPSTAT_INC(ipcomps_output);
  373 
  374         /* Check for maximum packet size violations. */
  375         switch (sav->sah->saidx.dst.sa.sa_family) {
  376 #ifdef INET
  377         case AF_INET:
  378                 maxpacketsize = IP_MAXPACKET;
  379                 break;
  380 #endif /* INET */
  381 #ifdef INET6
  382         case AF_INET6:
  383                 maxpacketsize = IPV6_MAXPACKET;
  384                 break;
  385 #endif /* INET6 */
  386         default:
  387                 IPCOMPSTAT_INC(ipcomps_nopf);
  388                 DPRINTF(("%s: unknown/unsupported protocol family %d, "
  389                     "IPCA %s/%08lx\n", __func__,
  390                     sav->sah->saidx.dst.sa.sa_family,
  391                     ipsec_address(&sav->sah->saidx.dst),
  392                     (u_long) ntohl(sav->spi)));
  393                 error = EPFNOSUPPORT;
  394                 goto bad;
  395         }
  396         if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) {
  397                 IPCOMPSTAT_INC(ipcomps_toobig);
  398                 DPRINTF(("%s: packet in IPCA %s/%08lx got too big "
  399                     "(len %u, max len %u)\n", __func__,
  400                     ipsec_address(&sav->sah->saidx.dst),
  401                     (u_long) ntohl(sav->spi),
  402                     ralen + skip + IPCOMP_HLENGTH, maxpacketsize));
  403                 error = EMSGSIZE;
  404                 goto bad;
  405         }
  406 
  407         /* Update the counters */
  408         IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip);
  409 
  410         m = m_unshare(m, M_NOWAIT);
  411         if (m == NULL) {
  412                 IPCOMPSTAT_INC(ipcomps_hdrops);
  413                 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n",
  414                     __func__, ipsec_address(&sav->sah->saidx.dst),
  415                     (u_long) ntohl(sav->spi)));
  416                 error = ENOBUFS;
  417                 goto bad;
  418         }
  419 
  420         /* Ok now, we can pass to the crypto processing. */
  421 
  422         /* Get crypto descriptors */
  423         crp = crypto_getreq(1);
  424         if (crp == NULL) {
  425                 IPCOMPSTAT_INC(ipcomps_crypto);
  426                 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
  427                 error = ENOBUFS;
  428                 goto bad;
  429         }
  430         crdc = crp->crp_desc;
  431 
  432         /* Compression descriptor */
  433         crdc->crd_skip = skip;
  434         crdc->crd_len = ralen;
  435         crdc->crd_flags = CRD_F_COMP;
  436         crdc->crd_inject = skip;
  437 
  438         /* Compression operation */
  439         crdc->crd_alg = ipcompx->type;
  440 
  441         /* IPsec-specific opaque crypto info */
  442         tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
  443                 M_XDATA, M_NOWAIT|M_ZERO);
  444         if (tc == NULL) {
  445                 IPCOMPSTAT_INC(ipcomps_crypto);
  446                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
  447                 crypto_freereq(crp);
  448                 error = ENOBUFS;
  449                 goto bad;
  450         }
  451 
  452         tc->tc_isr = isr;
  453         KEY_ADDREFSA(sav);
  454         tc->tc_sav = sav;
  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 = tc->tc_sav;
  496         /* With the isr lock released SA pointer can be updated. */
  497         if (sav != isr->sav) {
  498                 IPCOMPSTAT_INC(ipcomps_notdb);
  499                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
  500                 error = ENOBUFS;                /*XXX*/
  501                 goto bad;
  502         }
  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                         IPSECREQUEST_UNLOCK(isr);
  512                         return crypto_dispatch(crp);
  513                 }
  514                 IPCOMPSTAT_INC(ipcomps_noxform);
  515                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  516                 error = crp->crp_etype;
  517                 goto bad;
  518         }
  519         /* Shouldn't happen... */
  520         if (m == NULL) {
  521                 IPCOMPSTAT_INC(ipcomps_crypto);
  522                 DPRINTF(("%s: bogus return buffer from crypto\n", __func__));
  523                 error = EINVAL;
  524                 goto bad;
  525         }
  526         IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
  527 
  528         if (crp->crp_ilen - skip > crp->crp_olen) {
  529                 struct mbuf *mo;
  530                 struct ipcomp *ipcomp;
  531                 int roff;
  532                 uint8_t prot;
  533 
  534                 /* Compression helped, inject IPCOMP header. */
  535                 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
  536                 if (mo == NULL) {
  537                         IPCOMPSTAT_INC(ipcomps_wrap);
  538                         DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n",
  539                             __func__, ipsec_address(&sav->sah->saidx.dst),
  540                             (u_long) ntohl(sav->spi)));
  541                         error = ENOBUFS;
  542                         goto bad;
  543                 }
  544                 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
  545 
  546                 /* Initialize the IPCOMP header */
  547                 /* XXX alignment always correct? */
  548                 switch (sav->sah->saidx.dst.sa.sa_family) {
  549 #ifdef INET
  550                 case AF_INET:
  551                         ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
  552                         break;
  553 #endif /* INET */
  554 #ifdef INET6
  555                 case AF_INET6:
  556                         ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
  557                         break;
  558 #endif
  559                 }
  560                 ipcomp->comp_flags = 0;
  561                 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
  562 
  563                 /* Fix Next Protocol in IPv4/IPv6 header */
  564                 prot = IPPROTO_IPCOMP;
  565                 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t),
  566                     (u_char *)&prot);
  567 
  568                 /* Adjust the length in the IP header */
  569                 switch (sav->sah->saidx.dst.sa.sa_family) {
  570 #ifdef INET
  571                 case AF_INET:
  572                         mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
  573                         break;
  574 #endif /* INET */
  575 #ifdef INET6
  576                 case AF_INET6:
  577                         mtod(m, struct ip6_hdr *)->ip6_plen =
  578                                 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
  579                         break;
  580 #endif /* INET6 */
  581                 default:
  582                         IPCOMPSTAT_INC(ipcomps_nopf);
  583                         DPRINTF(("%s: unknown/unsupported protocol "
  584                             "family %d, IPCA %s/%08lx\n", __func__,
  585                             sav->sah->saidx.dst.sa.sa_family,
  586                             ipsec_address(&sav->sah->saidx.dst),
  587                             (u_long) ntohl(sav->spi)));
  588                         error = EPFNOSUPPORT;
  589                         goto bad;
  590                 }
  591         } else {
  592                 /* Compression was useless, we have lost time. */
  593                 IPCOMPSTAT_INC(ipcomps_uncompr);
  594                 DPRINTF(("%s: compressions was useless %d - %d <= %d\n",
  595                     __func__, crp->crp_ilen, skip, crp->crp_olen));
  596                 /* XXX remember state to not compress the next couple
  597                  *     of packets, RFC 3173, 2.2. Non-Expansion Policy */
  598         }
  599 
  600         /* Release the crypto descriptor */
  601         free(tc, M_XDATA);
  602         crypto_freereq(crp);
  603 
  604         /* NB: m is reclaimed by ipsec_process_done. */
  605         error = ipsec_process_done(m, isr);
  606         KEY_FREESAV(&sav);
  607         IPSECREQUEST_UNLOCK(isr);
  608         return error;
  609 bad:
  610         if (sav)
  611                 KEY_FREESAV(&sav);
  612         IPSECREQUEST_UNLOCK(isr);
  613         if (m)
  614                 m_freem(m);
  615         free(tc, M_XDATA);
  616         crypto_freereq(crp);
  617         return error;
  618 }
  619 
  620 static struct xformsw ipcomp_xformsw = {
  621         XF_IPCOMP,              XFT_COMP,               "IPcomp",
  622         ipcomp_init,            ipcomp_zeroize,         ipcomp_input,
  623         ipcomp_output
  624 };
  625 
  626 static void
  627 ipcomp_attach(void)
  628 {
  629 
  630         xform_register(&ipcomp_xformsw);
  631 }
  632 
  633 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL);
  634 
  635 static void
  636 vnet_ipcomp_attach(const void *unused __unused)
  637 {
  638 
  639         /* XXX */
  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);

Cache object: b351ef522a83c343b2421ab2136467e4


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