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/8.1/sys/netipsec/xform_ipcomp.c 200149 2009-12-05 19:25:29Z bz $       */
    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         int hlen = IPCOMP_HLENGTH;
  145 
  146         /* Get crypto descriptors */
  147         crp = crypto_getreq(1);
  148         if (crp == NULL) {
  149                 m_freem(m);
  150                 DPRINTF(("%s: no crypto descriptors\n", __func__));
  151                 V_ipcompstat.ipcomps_crypto++;
  152                 return ENOBUFS;
  153         }
  154         /* Get IPsec-specific opaque pointer */
  155         tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO);
  156         if (tc == NULL) {
  157                 m_freem(m);
  158                 crypto_freereq(crp);
  159                 DPRINTF(("%s: cannot allocate tdb_crypto\n", __func__));
  160                 V_ipcompstat.ipcomps_crypto++;
  161                 return ENOBUFS;
  162         }
  163         crdc = crp->crp_desc;
  164 
  165         crdc->crd_skip = skip + hlen;
  166         crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
  167         crdc->crd_inject = skip;
  168 
  169         tc->tc_ptr = 0;
  170 
  171         /* Decompression operation */
  172         crdc->crd_alg = sav->tdb_compalgxform->type;
  173 
  174         /* Crypto operation descriptor */
  175         crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
  176         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
  177         crp->crp_buf = (caddr_t) m;
  178         crp->crp_callback = ipcomp_input_cb;
  179         crp->crp_sid = sav->tdb_cryptoid;
  180         crp->crp_opaque = (caddr_t) tc;
  181 
  182         /* These are passed as-is to the callback */
  183         tc->tc_spi = sav->spi;
  184         tc->tc_dst = sav->sah->saidx.dst;
  185         tc->tc_proto = sav->sah->saidx.proto;
  186         tc->tc_protoff = protoff;
  187         tc->tc_skip = skip;
  188 
  189         return crypto_dispatch(crp);
  190 }
  191 
  192 #ifdef INET6
  193 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do {              \
  194         if (saidx->dst.sa.sa_family == AF_INET6) {                           \
  195                 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
  196         } else {                                                             \
  197                 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
  198         }                                                                    \
  199 } while (0)
  200 #else
  201 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag)                   \
  202         (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
  203 #endif
  204 
  205 /*
  206  * IPComp input callback from the crypto driver.
  207  */
  208 static int
  209 ipcomp_input_cb(struct cryptop *crp)
  210 {
  211         struct cryptodesc *crd;
  212         struct tdb_crypto *tc;
  213         int skip, protoff;
  214         struct mtag *mtag;
  215         struct mbuf *m;
  216         struct secasvar *sav;
  217         struct secasindex *saidx;
  218         int hlen = IPCOMP_HLENGTH, error, clen;
  219         u_int8_t nproto;
  220         caddr_t addr;
  221 
  222         crd = crp->crp_desc;
  223 
  224         tc = (struct tdb_crypto *) crp->crp_opaque;
  225         IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!"));
  226         skip = tc->tc_skip;
  227         protoff = tc->tc_protoff;
  228         mtag = (struct mtag *) tc->tc_ptr;
  229         m = (struct mbuf *) crp->crp_buf;
  230 
  231         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
  232         if (sav == NULL) {
  233                 V_ipcompstat.ipcomps_notdb++;
  234                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
  235                 error = ENOBUFS;                /*XXX*/
  236                 goto bad;
  237         }
  238 
  239         saidx = &sav->sah->saidx;
  240         IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
  241                 saidx->dst.sa.sa_family == AF_INET6,
  242                 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
  243 
  244         /* Check for crypto errors */
  245         if (crp->crp_etype) {
  246                 /* Reset the session ID */
  247                 if (sav->tdb_cryptoid != 0)
  248                         sav->tdb_cryptoid = crp->crp_sid;
  249 
  250                 if (crp->crp_etype == EAGAIN) {
  251                         KEY_FREESAV(&sav);
  252                         return crypto_dispatch(crp);
  253                 }
  254                 V_ipcompstat.ipcomps_noxform++;
  255                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  256                 error = crp->crp_etype;
  257                 goto bad;
  258         }
  259         /* Shouldn't happen... */
  260         if (m == NULL) {
  261                 V_ipcompstat.ipcomps_crypto++;
  262                 DPRINTF(("%s: null mbuf returned from crypto\n", __func__));
  263                 error = EINVAL;
  264                 goto bad;
  265         }
  266         V_ipcompstat.ipcomps_hist[sav->alg_comp]++;
  267 
  268         clen = crp->crp_olen;           /* Length of data after processing */
  269 
  270         /* Release the crypto descriptors */
  271         free(tc, M_XDATA), tc = NULL;
  272         crypto_freereq(crp), crp = NULL;
  273 
  274         /* In case it's not done already, adjust the size of the mbuf chain */
  275         m->m_pkthdr.len = clen + hlen + skip;
  276 
  277         if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
  278                 V_ipcompstat.ipcomps_hdrops++;          /*XXX*/
  279                 DPRINTF(("%s: m_pullup failed\n", __func__));
  280                 error = EINVAL;                         /*XXX*/
  281                 goto bad;
  282         }
  283 
  284         /* Keep the next protocol field */
  285         addr = (caddr_t) mtod(m, struct ip *) + skip;
  286         nproto = ((struct ipcomp *) addr)->comp_nxt;
  287 
  288         /* Remove the IPCOMP header */
  289         error = m_striphdr(m, skip, hlen);
  290         if (error) {
  291                 V_ipcompstat.ipcomps_hdrops++;
  292                 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__,
  293                          ipsec_address(&sav->sah->saidx.dst),
  294                          (u_long) ntohl(sav->spi)));
  295                 goto bad;
  296         }
  297 
  298         /* Restore the Next Protocol field */
  299         m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
  300 
  301         IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
  302 
  303         KEY_FREESAV(&sav);
  304         return error;
  305 bad:
  306         if (sav)
  307                 KEY_FREESAV(&sav);
  308         if (m)
  309                 m_freem(m);
  310         if (tc != NULL)
  311                 free(tc, M_XDATA);
  312         if (crp)
  313                 crypto_freereq(crp);
  314         return error;
  315 }
  316 
  317 /*
  318  * IPComp output routine, called by ipsec[46]_process_packet()
  319  */
  320 static int
  321 ipcomp_output(
  322         struct mbuf *m,
  323         struct ipsecrequest *isr,
  324         struct mbuf **mp,
  325         int skip,
  326         int protoff
  327 )
  328 {
  329         struct secasvar *sav;
  330         struct comp_algo *ipcompx;
  331         int error, ralen, maxpacketsize;
  332         struct cryptodesc *crdc;
  333         struct cryptop *crp;
  334         struct tdb_crypto *tc;
  335 
  336         sav = isr->sav;
  337         IPSEC_ASSERT(sav != NULL, ("null SA"));
  338         ipcompx = sav->tdb_compalgxform;
  339         IPSEC_ASSERT(ipcompx != NULL, ("null compression xform"));
  340 
  341         /*
  342          * Do not touch the packet in case our payload to compress
  343          * is lower than the minimal threshold of the compression
  344          * alogrithm.  We will just send out the data uncompressed.
  345          * See RFC 3173, 2.2. Non-Expansion Policy.
  346          */
  347         if (m->m_pkthdr.len <= ipcompx->minlen) {
  348                 V_ipcompstat.ipcomps_threshold++;
  349                 return ipsec_process_done(m, isr);
  350         }
  351 
  352         ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
  353         V_ipcompstat.ipcomps_output++;
  354 
  355         /* Check for maximum packet size violations. */
  356         switch (sav->sah->saidx.dst.sa.sa_family) {
  357 #ifdef INET
  358         case AF_INET:
  359                 maxpacketsize = IP_MAXPACKET;
  360                 break;
  361 #endif /* INET */
  362 #ifdef INET6
  363         case AF_INET6:
  364                 maxpacketsize = IPV6_MAXPACKET;
  365                 break;
  366 #endif /* INET6 */
  367         default:
  368                 V_ipcompstat.ipcomps_nopf++;
  369                 DPRINTF(("%s: unknown/unsupported protocol family %d, "
  370                     "IPCA %s/%08lx\n", __func__,
  371                     sav->sah->saidx.dst.sa.sa_family,
  372                     ipsec_address(&sav->sah->saidx.dst),
  373                     (u_long) ntohl(sav->spi)));
  374                 error = EPFNOSUPPORT;
  375                 goto bad;
  376         }
  377         if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) {
  378                 V_ipcompstat.ipcomps_toobig++;
  379                 DPRINTF(("%s: packet in IPCA %s/%08lx got too big "
  380                     "(len %u, max len %u)\n", __func__,
  381                     ipsec_address(&sav->sah->saidx.dst),
  382                     (u_long) ntohl(sav->spi),
  383                     ralen + skip + IPCOMP_HLENGTH, maxpacketsize));
  384                 error = EMSGSIZE;
  385                 goto bad;
  386         }
  387 
  388         /* Update the counters */
  389         V_ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip;
  390 
  391         m = m_unshare(m, M_NOWAIT);
  392         if (m == NULL) {
  393                 V_ipcompstat.ipcomps_hdrops++;
  394                 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n",
  395                     __func__, ipsec_address(&sav->sah->saidx.dst),
  396                     (u_long) ntohl(sav->spi)));
  397                 error = ENOBUFS;
  398                 goto bad;
  399         }
  400 
  401         /* Ok now, we can pass to the crypto processing. */
  402 
  403         /* Get crypto descriptors */
  404         crp = crypto_getreq(1);
  405         if (crp == NULL) {
  406                 V_ipcompstat.ipcomps_crypto++;
  407                 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
  408                 error = ENOBUFS;
  409                 goto bad;
  410         }
  411         crdc = crp->crp_desc;
  412 
  413         /* Compression descriptor */
  414         crdc->crd_skip = skip;
  415         crdc->crd_len = ralen;
  416         crdc->crd_flags = CRD_F_COMP;
  417         crdc->crd_inject = skip;
  418 
  419         /* Compression operation */
  420         crdc->crd_alg = ipcompx->type;
  421 
  422         /* IPsec-specific opaque crypto info */
  423         tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
  424                 M_XDATA, M_NOWAIT|M_ZERO);
  425         if (tc == NULL) {
  426                 V_ipcompstat.ipcomps_crypto++;
  427                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
  428                 crypto_freereq(crp);
  429                 error = ENOBUFS;
  430                 goto bad;
  431         }
  432 
  433         tc->tc_isr = isr;
  434         tc->tc_spi = sav->spi;
  435         tc->tc_dst = sav->sah->saidx.dst;
  436         tc->tc_proto = sav->sah->saidx.proto;
  437         tc->tc_protoff = protoff;
  438         tc->tc_skip = skip;
  439 
  440         /* Crypto operation descriptor */
  441         crp->crp_ilen = m->m_pkthdr.len;        /* Total input length */
  442         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
  443         crp->crp_buf = (caddr_t) m;
  444         crp->crp_callback = ipcomp_output_cb;
  445         crp->crp_opaque = (caddr_t) tc;
  446         crp->crp_sid = sav->tdb_cryptoid;
  447 
  448         return crypto_dispatch(crp);
  449 bad:
  450         if (m)
  451                 m_freem(m);
  452         return (error);
  453 }
  454 
  455 /*
  456  * IPComp output callback from the crypto driver.
  457  */
  458 static int
  459 ipcomp_output_cb(struct cryptop *crp)
  460 {
  461         struct tdb_crypto *tc;
  462         struct ipsecrequest *isr;
  463         struct secasvar *sav;
  464         struct mbuf *m;
  465         int error, skip;
  466 
  467         tc = (struct tdb_crypto *) crp->crp_opaque;
  468         IPSEC_ASSERT(tc != NULL, ("null opaque data area!"));
  469         m = (struct mbuf *) crp->crp_buf;
  470         skip = tc->tc_skip;
  471 
  472         isr = tc->tc_isr;
  473         IPSECREQUEST_LOCK(isr);
  474         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
  475         if (sav == NULL) {
  476                 V_ipcompstat.ipcomps_notdb++;
  477                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
  478                 error = ENOBUFS;                /*XXX*/
  479                 goto bad;
  480         }
  481         IPSEC_ASSERT(isr->sav == sav, ("SA changed\n"));
  482 
  483         /* Check for crypto errors */
  484         if (crp->crp_etype) {
  485                 /* Reset the session ID */
  486                 if (sav->tdb_cryptoid != 0)
  487                         sav->tdb_cryptoid = crp->crp_sid;
  488 
  489                 if (crp->crp_etype == EAGAIN) {
  490                         KEY_FREESAV(&sav);
  491                         IPSECREQUEST_UNLOCK(isr);
  492                         return crypto_dispatch(crp);
  493                 }
  494                 V_ipcompstat.ipcomps_noxform++;
  495                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  496                 error = crp->crp_etype;
  497                 goto bad;
  498         }
  499         /* Shouldn't happen... */
  500         if (m == NULL) {
  501                 V_ipcompstat.ipcomps_crypto++;
  502                 DPRINTF(("%s: bogus return buffer from crypto\n", __func__));
  503                 error = EINVAL;
  504                 goto bad;
  505         }
  506         V_ipcompstat.ipcomps_hist[sav->alg_comp]++;
  507 
  508         if (crp->crp_ilen - skip > crp->crp_olen) {
  509                 struct mbuf *mo;
  510                 struct ipcomp *ipcomp;
  511                 int roff;
  512                 uint8_t prot;
  513 
  514                 /* Compression helped, inject IPCOMP header. */
  515                 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
  516                 if (mo == NULL) {
  517                         V_ipcompstat.ipcomps_wrap++;
  518                         DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n",
  519                             __func__, ipsec_address(&sav->sah->saidx.dst),
  520                             (u_long) ntohl(sav->spi)));
  521                         error = ENOBUFS;
  522                         goto bad;
  523                 }
  524                 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
  525 
  526                 /* Initialize the IPCOMP header */
  527                 /* XXX alignment always correct? */
  528                 switch (sav->sah->saidx.dst.sa.sa_family) {
  529 #ifdef INET
  530                 case AF_INET:
  531                         ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
  532                         break;
  533 #endif /* INET */
  534 #ifdef INET6
  535                 case AF_INET6:
  536                         ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
  537                         break;
  538 #endif
  539                 }
  540                 ipcomp->comp_flags = 0;
  541                 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
  542 
  543                 /* Fix Next Protocol in IPv4/IPv6 header */
  544                 prot = IPPROTO_IPCOMP;
  545                 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t),
  546                     (u_char *)&prot);
  547 
  548                 /* Adjust the length in the IP header */
  549                 switch (sav->sah->saidx.dst.sa.sa_family) {
  550 #ifdef INET
  551                 case AF_INET:
  552                         mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
  553                         break;
  554 #endif /* INET */
  555 #ifdef INET6
  556                 case AF_INET6:
  557                         mtod(m, struct ip6_hdr *)->ip6_plen =
  558                                 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
  559                         break;
  560 #endif /* INET6 */
  561                 default:
  562                         V_ipcompstat.ipcomps_nopf++;
  563                         DPRINTF(("%s: unknown/unsupported protocol "
  564                             "family %d, IPCA %s/%08lx\n", __func__,
  565                             sav->sah->saidx.dst.sa.sa_family,
  566                             ipsec_address(&sav->sah->saidx.dst),
  567                             (u_long) ntohl(sav->spi)));
  568                         error = EPFNOSUPPORT;
  569                         goto bad;
  570                 }
  571         } else {
  572                 /* Compression was useless, we have lost time. */
  573                 V_ipcompstat.ipcomps_uncompr++;
  574                 DPRINTF(("%s: compressions was useless %d - %d <= %d\n",
  575                     __func__, crp->crp_ilen, skip, crp->crp_olen));
  576                 /* XXX remember state to not compress the next couple
  577                  *     of packets, RFC 3173, 2.2. Non-Expansion Policy */
  578         }
  579 
  580         /* Release the crypto descriptor */
  581         free(tc, M_XDATA);
  582         crypto_freereq(crp);
  583 
  584         /* NB: m is reclaimed by ipsec_process_done. */
  585         error = ipsec_process_done(m, isr);
  586         KEY_FREESAV(&sav);
  587         IPSECREQUEST_UNLOCK(isr);
  588         return error;
  589 bad:
  590         if (sav)
  591                 KEY_FREESAV(&sav);
  592         IPSECREQUEST_UNLOCK(isr);
  593         if (m)
  594                 m_freem(m);
  595         free(tc, M_XDATA);
  596         crypto_freereq(crp);
  597         return error;
  598 }
  599 
  600 static struct xformsw ipcomp_xformsw = {
  601         XF_IPCOMP,              XFT_COMP,               "IPcomp",
  602         ipcomp_init,            ipcomp_zeroize,         ipcomp_input,
  603         ipcomp_output
  604 };
  605 
  606 static void
  607 ipcomp_attach(void)
  608 {
  609 
  610         xform_register(&ipcomp_xformsw);
  611 }
  612 
  613 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL);
  614 
  615 static void
  616 vnet_ipcomp_attach(const void *unused __unused)
  617 {
  618 
  619         V_ipcompstat.version = IPCOMPSTAT_VERSION;
  620 }
  621 
  622 VNET_SYSINIT(vnet_ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
  623     vnet_ipcomp_attach, NULL);

Cache object: 132d0c8571ab972b610019ba03442355


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