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/10.3/sys/netipsec/xform_ipcomp.c 283901 2015-06-02 03:14:42Z 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/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_PCPUSTAT_DEFINE(struct ipcompstat, ipcompstat);
   73 VNET_PCPUSTAT_SYSINIT(ipcompstat);
   74 
   75 #ifdef VIMAGE
   76 VNET_PCPUSTAT_SYSUNINIT(ipcompstat);
   77 #endif /* VIMAGE */
   78 
   79 SYSCTL_DECL(_net_inet_ipcomp);
   80 SYSCTL_VNET_INT(_net_inet_ipcomp, OID_AUTO,
   81         ipcomp_enable,  CTLFLAG_RW,     &VNET_NAME(ipcomp_enable),      0, "");
   82 SYSCTL_VNET_PCPUSTAT(_net_inet_ipcomp, IPSECCTL_STATS, stats,
   83     struct ipcompstat, ipcompstat,
   84     "IPCOMP statistics (struct ipcompstat, netipsec/ipcomp_var.h");
   85 
   86 static int ipcomp_input_cb(struct cryptop *crp);
   87 static int ipcomp_output_cb(struct cryptop *crp);
   88 
   89 struct comp_algo *
   90 ipcomp_algorithm_lookup(int alg)
   91 {
   92         if (alg >= IPCOMP_ALG_MAX)
   93                 return NULL;
   94         switch (alg) {
   95         case SADB_X_CALG_DEFLATE:
   96                 return &comp_algo_deflate;
   97         }
   98         return NULL;
   99 }
  100 
  101 /*
  102  * ipcomp_init() is called when an CPI is being set up.
  103  */
  104 static int
  105 ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
  106 {
  107         struct comp_algo *tcomp;
  108         struct cryptoini cric;
  109 
  110         /* NB: algorithm really comes in alg_enc and not alg_comp! */
  111         tcomp = ipcomp_algorithm_lookup(sav->alg_enc);
  112         if (tcomp == NULL) {
  113                 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__,
  114                          sav->alg_comp));
  115                 return EINVAL;
  116         }
  117         sav->alg_comp = sav->alg_enc;           /* set for doing histogram */
  118         sav->tdb_xform = xsp;
  119         sav->tdb_compalgxform = tcomp;
  120 
  121         /* Initialize crypto session */
  122         bzero(&cric, sizeof (cric));
  123         cric.cri_alg = sav->tdb_compalgxform->type;
  124 
  125         return crypto_newsession(&sav->tdb_cryptoid, &cric, V_crypto_support);
  126 }
  127 
  128 /*
  129  * ipcomp_zeroize() used when IPCA is deleted
  130  */
  131 static int
  132 ipcomp_zeroize(struct secasvar *sav)
  133 {
  134         int err;
  135 
  136         err = crypto_freesession(sav->tdb_cryptoid);
  137         sav->tdb_cryptoid = 0;
  138         return err;
  139 }
  140 
  141 /*
  142  * ipcomp_input() gets called to uncompress an input packet
  143  */
  144 static int
  145 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  146 {
  147         struct tdb_crypto *tc;
  148         struct cryptodesc *crdc;
  149         struct cryptop *crp;
  150         struct ipcomp *ipcomp;
  151         caddr_t addr;
  152         int hlen = IPCOMP_HLENGTH;
  153 
  154         /*
  155          * Check that the next header of the IPComp is not IPComp again, before
  156          * doing any real work.  Given it is not possible to do double
  157          * compression it means someone is playing tricks on us.
  158          */
  159         if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
  160                 IPCOMPSTAT_INC(ipcomps_hdrops);         /*XXX*/
  161                 DPRINTF(("%s: m_pullup failed\n", __func__));
  162                 return (ENOBUFS);
  163         }
  164         addr = (caddr_t) mtod(m, struct ip *) + skip;
  165         ipcomp = (struct ipcomp *)addr;
  166         if (ipcomp->comp_nxt == IPPROTO_IPCOMP) {
  167                 m_freem(m);
  168                 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */
  169                 DPRINTF(("%s: recursive compression detected\n", __func__));
  170                 return (EINVAL);
  171         }
  172 
  173         /* Get crypto descriptors */
  174         crp = crypto_getreq(1);
  175         if (crp == NULL) {
  176                 m_freem(m);
  177                 DPRINTF(("%s: no crypto descriptors\n", __func__));
  178                 IPCOMPSTAT_INC(ipcomps_crypto);
  179                 return ENOBUFS;
  180         }
  181         /* Get IPsec-specific opaque pointer */
  182         tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO);
  183         if (tc == NULL) {
  184                 m_freem(m);
  185                 crypto_freereq(crp);
  186                 DPRINTF(("%s: cannot allocate tdb_crypto\n", __func__));
  187                 IPCOMPSTAT_INC(ipcomps_crypto);
  188                 return ENOBUFS;
  189         }
  190         crdc = crp->crp_desc;
  191 
  192         crdc->crd_skip = skip + hlen;
  193         crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
  194         crdc->crd_inject = skip;
  195 
  196         tc->tc_ptr = 0;
  197 
  198         /* Decompression operation */
  199         crdc->crd_alg = sav->tdb_compalgxform->type;
  200 
  201         /* Crypto operation descriptor */
  202         crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
  203         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
  204         crp->crp_buf = (caddr_t) m;
  205         crp->crp_callback = ipcomp_input_cb;
  206         crp->crp_sid = sav->tdb_cryptoid;
  207         crp->crp_opaque = (caddr_t) tc;
  208 
  209         /* These are passed as-is to the callback */
  210         tc->tc_spi = sav->spi;
  211         tc->tc_dst = sav->sah->saidx.dst;
  212         tc->tc_proto = sav->sah->saidx.proto;
  213         tc->tc_protoff = protoff;
  214         tc->tc_skip = skip;
  215         KEY_ADDREFSA(sav);
  216         tc->tc_sav = sav;
  217 
  218         return crypto_dispatch(crp);
  219 }
  220 
  221 /*
  222  * IPComp input callback from the crypto driver.
  223  */
  224 static int
  225 ipcomp_input_cb(struct cryptop *crp)
  226 {
  227         struct cryptodesc *crd;
  228         struct tdb_crypto *tc;
  229         int skip, protoff;
  230         struct mtag *mtag;
  231         struct mbuf *m;
  232         struct secasvar *sav;
  233         struct secasindex *saidx;
  234         int hlen = IPCOMP_HLENGTH, error, clen;
  235         u_int8_t nproto;
  236         caddr_t addr;
  237 
  238         crd = crp->crp_desc;
  239 
  240         tc = (struct tdb_crypto *) crp->crp_opaque;
  241         IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!"));
  242         skip = tc->tc_skip;
  243         protoff = tc->tc_protoff;
  244         mtag = (struct mtag *) tc->tc_ptr;
  245         m = (struct mbuf *) crp->crp_buf;
  246 
  247         sav = tc->tc_sav;
  248         IPSEC_ASSERT(sav != NULL, ("null SA!"));
  249 
  250         saidx = &sav->sah->saidx;
  251         IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
  252                 saidx->dst.sa.sa_family == AF_INET6,
  253                 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
  254 
  255         /* Check for crypto errors */
  256         if (crp->crp_etype) {
  257                 /* Reset the session ID */
  258                 if (sav->tdb_cryptoid != 0)
  259                         sav->tdb_cryptoid = crp->crp_sid;
  260 
  261                 if (crp->crp_etype == EAGAIN) {
  262                         return crypto_dispatch(crp);
  263                 }
  264                 IPCOMPSTAT_INC(ipcomps_noxform);
  265                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  266                 error = crp->crp_etype;
  267                 goto bad;
  268         }
  269         /* Shouldn't happen... */
  270         if (m == NULL) {
  271                 IPCOMPSTAT_INC(ipcomps_crypto);
  272                 DPRINTF(("%s: null mbuf returned from crypto\n", __func__));
  273                 error = EINVAL;
  274                 goto bad;
  275         }
  276         IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
  277 
  278         clen = crp->crp_olen;           /* Length of data after processing */
  279 
  280         /* Release the crypto descriptors */
  281         free(tc, M_XDATA), tc = NULL;
  282         crypto_freereq(crp), crp = NULL;
  283 
  284         /* In case it's not done already, adjust the size of the mbuf chain */
  285         m->m_pkthdr.len = clen + hlen + skip;
  286 
  287         if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
  288                 IPCOMPSTAT_INC(ipcomps_hdrops);         /*XXX*/
  289                 DPRINTF(("%s: m_pullup failed\n", __func__));
  290                 error = EINVAL;                         /*XXX*/
  291                 goto bad;
  292         }
  293 
  294         /* Keep the next protocol field */
  295         addr = (caddr_t) mtod(m, struct ip *) + skip;
  296         nproto = ((struct ipcomp *) addr)->comp_nxt;
  297 
  298         /* Remove the IPCOMP header */
  299         error = m_striphdr(m, skip, hlen);
  300         if (error) {
  301                 IPCOMPSTAT_INC(ipcomps_hdrops);
  302                 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__,
  303                          ipsec_address(&sav->sah->saidx.dst),
  304                          (u_long) ntohl(sav->spi)));
  305                 goto bad;
  306         }
  307 
  308         /* Restore the Next Protocol field */
  309         m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
  310 
  311         switch (saidx->dst.sa.sa_family) {
  312 #ifdef INET6
  313         case AF_INET6:
  314                 error = ipsec6_common_input_cb(m, sav, skip, protoff, NULL);
  315                 break;
  316 #endif
  317 #ifdef INET
  318         case AF_INET:
  319                 error = ipsec4_common_input_cb(m, sav, skip, protoff, NULL);
  320                 break;
  321 #endif
  322         default:
  323                 panic("%s: Unexpected address family: %d saidx=%p", __func__,
  324                     saidx->dst.sa.sa_family, saidx);
  325         }
  326 
  327         KEY_FREESAV(&sav);
  328         return error;
  329 bad:
  330         if (sav)
  331                 KEY_FREESAV(&sav);
  332         if (m)
  333                 m_freem(m);
  334         if (tc != NULL)
  335                 free(tc, M_XDATA);
  336         if (crp)
  337                 crypto_freereq(crp);
  338         return error;
  339 }
  340 
  341 /*
  342  * IPComp output routine, called by ipsec[46]_process_packet()
  343  */
  344 static int
  345 ipcomp_output(
  346         struct mbuf *m,
  347         struct ipsecrequest *isr,
  348         struct mbuf **mp,
  349         int skip,
  350         int protoff
  351 )
  352 {
  353         struct secasvar *sav;
  354         struct comp_algo *ipcompx;
  355         int error, ralen, maxpacketsize;
  356         struct cryptodesc *crdc;
  357         struct cryptop *crp;
  358         struct tdb_crypto *tc;
  359 
  360         sav = isr->sav;
  361         IPSEC_ASSERT(sav != NULL, ("null SA"));
  362         ipcompx = sav->tdb_compalgxform;
  363         IPSEC_ASSERT(ipcompx != NULL, ("null compression xform"));
  364 
  365         /*
  366          * Do not touch the packet in case our payload to compress
  367          * is lower than the minimal threshold of the compression
  368          * alogrithm.  We will just send out the data uncompressed.
  369          * See RFC 3173, 2.2. Non-Expansion Policy.
  370          */
  371         if (m->m_pkthdr.len <= ipcompx->minlen) {
  372                 IPCOMPSTAT_INC(ipcomps_threshold);
  373                 return ipsec_process_done(m, isr);
  374         }
  375 
  376         ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
  377         IPCOMPSTAT_INC(ipcomps_output);
  378 
  379         /* Check for maximum packet size violations. */
  380         switch (sav->sah->saidx.dst.sa.sa_family) {
  381 #ifdef INET
  382         case AF_INET:
  383                 maxpacketsize = IP_MAXPACKET;
  384                 break;
  385 #endif /* INET */
  386 #ifdef INET6
  387         case AF_INET6:
  388                 maxpacketsize = IPV6_MAXPACKET;
  389                 break;
  390 #endif /* INET6 */
  391         default:
  392                 IPCOMPSTAT_INC(ipcomps_nopf);
  393                 DPRINTF(("%s: unknown/unsupported protocol family %d, "
  394                     "IPCA %s/%08lx\n", __func__,
  395                     sav->sah->saidx.dst.sa.sa_family,
  396                     ipsec_address(&sav->sah->saidx.dst),
  397                     (u_long) ntohl(sav->spi)));
  398                 error = EPFNOSUPPORT;
  399                 goto bad;
  400         }
  401         if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) {
  402                 IPCOMPSTAT_INC(ipcomps_toobig);
  403                 DPRINTF(("%s: packet in IPCA %s/%08lx got too big "
  404                     "(len %u, max len %u)\n", __func__,
  405                     ipsec_address(&sav->sah->saidx.dst),
  406                     (u_long) ntohl(sav->spi),
  407                     ralen + skip + IPCOMP_HLENGTH, maxpacketsize));
  408                 error = EMSGSIZE;
  409                 goto bad;
  410         }
  411 
  412         /* Update the counters */
  413         IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip);
  414 
  415         m = m_unshare(m, M_NOWAIT);
  416         if (m == NULL) {
  417                 IPCOMPSTAT_INC(ipcomps_hdrops);
  418                 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n",
  419                     __func__, ipsec_address(&sav->sah->saidx.dst),
  420                     (u_long) ntohl(sav->spi)));
  421                 error = ENOBUFS;
  422                 goto bad;
  423         }
  424 
  425         /* Ok now, we can pass to the crypto processing. */
  426 
  427         /* Get crypto descriptors */
  428         crp = crypto_getreq(1);
  429         if (crp == NULL) {
  430                 IPCOMPSTAT_INC(ipcomps_crypto);
  431                 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
  432                 error = ENOBUFS;
  433                 goto bad;
  434         }
  435         crdc = crp->crp_desc;
  436 
  437         /* Compression descriptor */
  438         crdc->crd_skip = skip;
  439         crdc->crd_len = ralen;
  440         crdc->crd_flags = CRD_F_COMP;
  441         crdc->crd_inject = skip;
  442 
  443         /* Compression operation */
  444         crdc->crd_alg = ipcompx->type;
  445 
  446         /* IPsec-specific opaque crypto info */
  447         tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
  448                 M_XDATA, M_NOWAIT|M_ZERO);
  449         if (tc == NULL) {
  450                 IPCOMPSTAT_INC(ipcomps_crypto);
  451                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
  452                 crypto_freereq(crp);
  453                 error = ENOBUFS;
  454                 goto bad;
  455         }
  456 
  457         tc->tc_isr = isr;
  458         KEY_ADDREFSA(sav);
  459         tc->tc_sav = sav;
  460         tc->tc_spi = sav->spi;
  461         tc->tc_dst = sav->sah->saidx.dst;
  462         tc->tc_proto = sav->sah->saidx.proto;
  463         tc->tc_protoff = protoff;
  464         tc->tc_skip = skip;
  465 
  466         /* Crypto operation descriptor */
  467         crp->crp_ilen = m->m_pkthdr.len;        /* Total input length */
  468         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
  469         crp->crp_buf = (caddr_t) m;
  470         crp->crp_callback = ipcomp_output_cb;
  471         crp->crp_opaque = (caddr_t) tc;
  472         crp->crp_sid = sav->tdb_cryptoid;
  473 
  474         return crypto_dispatch(crp);
  475 bad:
  476         if (m)
  477                 m_freem(m);
  478         return (error);
  479 }
  480 
  481 /*
  482  * IPComp output callback from the crypto driver.
  483  */
  484 static int
  485 ipcomp_output_cb(struct cryptop *crp)
  486 {
  487         struct tdb_crypto *tc;
  488         struct ipsecrequest *isr;
  489         struct secasvar *sav;
  490         struct mbuf *m;
  491         int error, skip;
  492 
  493         tc = (struct tdb_crypto *) crp->crp_opaque;
  494         IPSEC_ASSERT(tc != NULL, ("null opaque data area!"));
  495         m = (struct mbuf *) crp->crp_buf;
  496         skip = tc->tc_skip;
  497 
  498         isr = tc->tc_isr;
  499         IPSECREQUEST_LOCK(isr);
  500         sav = tc->tc_sav;
  501         /* With the isr lock released SA pointer can be updated. */
  502         if (sav != isr->sav) {
  503                 IPCOMPSTAT_INC(ipcomps_notdb);
  504                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
  505                 error = ENOBUFS;                /*XXX*/
  506                 goto bad;
  507         }
  508 
  509         /* Check for crypto errors */
  510         if (crp->crp_etype) {
  511                 /* Reset the session ID */
  512                 if (sav->tdb_cryptoid != 0)
  513                         sav->tdb_cryptoid = crp->crp_sid;
  514 
  515                 if (crp->crp_etype == EAGAIN) {
  516                         IPSECREQUEST_UNLOCK(isr);
  517                         return crypto_dispatch(crp);
  518                 }
  519                 IPCOMPSTAT_INC(ipcomps_noxform);
  520                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  521                 error = crp->crp_etype;
  522                 goto bad;
  523         }
  524         /* Shouldn't happen... */
  525         if (m == NULL) {
  526                 IPCOMPSTAT_INC(ipcomps_crypto);
  527                 DPRINTF(("%s: bogus return buffer from crypto\n", __func__));
  528                 error = EINVAL;
  529                 goto bad;
  530         }
  531         IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
  532 
  533         if (crp->crp_ilen - skip > crp->crp_olen) {
  534                 struct mbuf *mo;
  535                 struct ipcomp *ipcomp;
  536                 int roff;
  537                 uint8_t prot;
  538 
  539                 /* Compression helped, inject IPCOMP header. */
  540                 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
  541                 if (mo == NULL) {
  542                         IPCOMPSTAT_INC(ipcomps_wrap);
  543                         DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n",
  544                             __func__, ipsec_address(&sav->sah->saidx.dst),
  545                             (u_long) ntohl(sav->spi)));
  546                         error = ENOBUFS;
  547                         goto bad;
  548                 }
  549                 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
  550 
  551                 /* Initialize the IPCOMP header */
  552                 /* XXX alignment always correct? */
  553                 switch (sav->sah->saidx.dst.sa.sa_family) {
  554 #ifdef INET
  555                 case AF_INET:
  556                         ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
  557                         break;
  558 #endif /* INET */
  559 #ifdef INET6
  560                 case AF_INET6:
  561                         ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
  562                         break;
  563 #endif
  564                 }
  565                 ipcomp->comp_flags = 0;
  566                 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
  567 
  568                 /* Fix Next Protocol in IPv4/IPv6 header */
  569                 prot = IPPROTO_IPCOMP;
  570                 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t),
  571                     (u_char *)&prot);
  572 
  573                 /* Adjust the length in the IP header */
  574                 switch (sav->sah->saidx.dst.sa.sa_family) {
  575 #ifdef INET
  576                 case AF_INET:
  577                         mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
  578                         break;
  579 #endif /* INET */
  580 #ifdef INET6
  581                 case AF_INET6:
  582                         mtod(m, struct ip6_hdr *)->ip6_plen =
  583                                 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
  584                         break;
  585 #endif /* INET6 */
  586                 default:
  587                         IPCOMPSTAT_INC(ipcomps_nopf);
  588                         DPRINTF(("%s: unknown/unsupported protocol "
  589                             "family %d, IPCA %s/%08lx\n", __func__,
  590                             sav->sah->saidx.dst.sa.sa_family,
  591                             ipsec_address(&sav->sah->saidx.dst),
  592                             (u_long) ntohl(sav->spi)));
  593                         error = EPFNOSUPPORT;
  594                         goto bad;
  595                 }
  596         } else {
  597                 /* Compression was useless, we have lost time. */
  598                 IPCOMPSTAT_INC(ipcomps_uncompr);
  599                 DPRINTF(("%s: compressions was useless %d - %d <= %d\n",
  600                     __func__, crp->crp_ilen, skip, crp->crp_olen));
  601                 /* XXX remember state to not compress the next couple
  602                  *     of packets, RFC 3173, 2.2. Non-Expansion Policy */
  603         }
  604 
  605         /* Release the crypto descriptor */
  606         free(tc, M_XDATA);
  607         crypto_freereq(crp);
  608 
  609         /* NB: m is reclaimed by ipsec_process_done. */
  610         error = ipsec_process_done(m, isr);
  611         KEY_FREESAV(&sav);
  612         IPSECREQUEST_UNLOCK(isr);
  613         return error;
  614 bad:
  615         if (sav)
  616                 KEY_FREESAV(&sav);
  617         IPSECREQUEST_UNLOCK(isr);
  618         if (m)
  619                 m_freem(m);
  620         free(tc, M_XDATA);
  621         crypto_freereq(crp);
  622         return error;
  623 }
  624 
  625 static struct xformsw ipcomp_xformsw = {
  626         XF_IPCOMP,              XFT_COMP,               "IPcomp",
  627         ipcomp_init,            ipcomp_zeroize,         ipcomp_input,
  628         ipcomp_output
  629 };
  630 
  631 static void
  632 ipcomp_attach(void)
  633 {
  634 
  635         xform_register(&ipcomp_xformsw);
  636 }
  637 
  638 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL);

Cache object: 7e573a87050ca5d3022ea45d7d3f97b7


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