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FreeBSD/Linux Kernel Cross Reference
sys/netipsec/xform_ipcomp.c

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    1 /*      $FreeBSD: releng/7.4/sys/netipsec/xform_ipcomp.c 201244 2009-12-30 00:03:36Z 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 <netipsec/ipsec.h>
   52 #include <netipsec/xform.h>
   53 
   54 #ifdef INET6
   55 #include <netinet/ip6.h>
   56 #include <netipsec/ipsec6.h>
   57 #endif
   58 
   59 #include <netipsec/ipcomp.h>
   60 #include <netipsec/ipcomp_var.h>
   61 
   62 #include <netipsec/key.h>
   63 #include <netipsec/key_debug.h>
   64 
   65 #include <opencrypto/cryptodev.h>
   66 #include <opencrypto/deflate.h>
   67 #include <opencrypto/xform.h>
   68 
   69 int     ipcomp_enable = 1;
   70 struct  ipcompstat ipcompstat;
   71 
   72 SYSCTL_DECL(_net_inet_ipcomp);
   73 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO,
   74         ipcomp_enable,  CTLFLAG_RW,     &ipcomp_enable, 0, "");
   75 SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS,
   76         stats,          CTLFLAG_RD,     &ipcompstat,    ipcompstat, "");
   77 
   78 static int ipcomp_input_cb(struct cryptop *crp);
   79 static int ipcomp_output_cb(struct cryptop *crp);
   80 
   81 struct comp_algo *
   82 ipcomp_algorithm_lookup(int alg)
   83 {
   84         if (alg >= IPCOMP_ALG_MAX)
   85                 return NULL;
   86         switch (alg) {
   87         case SADB_X_CALG_DEFLATE:
   88                 return &comp_algo_deflate;
   89         }
   90         return NULL;
   91 }
   92 
   93 /*
   94  * ipcomp_init() is called when an CPI is being set up.
   95  */
   96 static int
   97 ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
   98 {
   99         struct comp_algo *tcomp;
  100         struct cryptoini cric;
  101 
  102         /* NB: algorithm really comes in alg_enc and not alg_comp! */
  103         tcomp = ipcomp_algorithm_lookup(sav->alg_enc);
  104         if (tcomp == NULL) {
  105                 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__,
  106                          sav->alg_comp));
  107                 return EINVAL;
  108         }
  109         sav->alg_comp = sav->alg_enc;           /* set for doing histogram */
  110         sav->tdb_xform = xsp;
  111         sav->tdb_compalgxform = tcomp;
  112 
  113         /* Initialize crypto session */
  114         bzero(&cric, sizeof (cric));
  115         cric.cri_alg = sav->tdb_compalgxform->type;
  116 
  117         return crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support);
  118 }
  119 
  120 /*
  121  * ipcomp_zeroize() used when IPCA is deleted
  122  */
  123 static int
  124 ipcomp_zeroize(struct secasvar *sav)
  125 {
  126         int err;
  127 
  128         err = crypto_freesession(sav->tdb_cryptoid);
  129         sav->tdb_cryptoid = 0;
  130         return err;
  131 }
  132 
  133 /*
  134  * ipcomp_input() gets called to uncompress an input packet
  135  */
  136 static int
  137 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  138 {
  139         struct tdb_crypto *tc;
  140         struct cryptodesc *crdc;
  141         struct cryptop *crp;
  142         int hlen = IPCOMP_HLENGTH;
  143 
  144         IPSEC_SPLASSERT_SOFTNET(__func__);
  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                 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                 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                 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                 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                 ipcompstat.ipcomps_crypto++;
  262                 DPRINTF(("%s: null mbuf returned from crypto\n", __func__));
  263                 error = EINVAL;
  264                 goto bad;
  265         }
  266         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                 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                 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         IPSEC_SPLASSERT_SOFTNET(__func__);
  337 
  338         sav = isr->sav;
  339         IPSEC_ASSERT(sav != NULL, ("null SA"));
  340         ipcompx = sav->tdb_compalgxform;
  341         IPSEC_ASSERT(ipcompx != NULL, ("null compression xform"));
  342 
  343         /*
  344          * Do not touch the packet in case our payload to compress
  345          * is lower than the minimal threshold of the compression
  346          * alogrithm.  We will just send out the data uncompressed.
  347          * See RFC 3173, 2.2. Non-Expansion Policy.
  348          */
  349         if (m->m_pkthdr.len <= ipcompx->minlen) {
  350                 ipcompstat.ipcomps_threshold++;
  351                 return ipsec_process_done(m, isr);
  352         }
  353 
  354         ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
  355         ipcompstat.ipcomps_output++;
  356 
  357         /* Check for maximum packet size violations. */
  358         switch (sav->sah->saidx.dst.sa.sa_family) {
  359 #ifdef INET
  360         case AF_INET:
  361                 maxpacketsize = IP_MAXPACKET;
  362                 break;
  363 #endif /* INET */
  364 #ifdef INET6
  365         case AF_INET6:
  366                 maxpacketsize = IPV6_MAXPACKET;
  367                 break;
  368 #endif /* INET6 */
  369         default:
  370                 ipcompstat.ipcomps_nopf++;
  371                 DPRINTF(("%s: unknown/unsupported protocol family %d, "
  372                     "IPCA %s/%08lx\n", __func__,
  373                     sav->sah->saidx.dst.sa.sa_family,
  374                     ipsec_address(&sav->sah->saidx.dst),
  375                     (u_long) ntohl(sav->spi)));
  376                 error = EPFNOSUPPORT;
  377                 goto bad;
  378         }
  379         if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) {
  380                 ipcompstat.ipcomps_toobig++;
  381                 DPRINTF(("%s: packet in IPCA %s/%08lx got too big "
  382                     "(len %u, max len %u)\n", __func__,
  383                     ipsec_address(&sav->sah->saidx.dst),
  384                     (u_long) ntohl(sav->spi),
  385                     ralen + skip + IPCOMP_HLENGTH, maxpacketsize));
  386                 error = EMSGSIZE;
  387                 goto bad;
  388         }
  389 
  390         /* Update the counters */
  391         ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip;
  392 
  393         m = m_unshare(m, M_NOWAIT);
  394         if (m == NULL) {
  395                 ipcompstat.ipcomps_hdrops++;
  396                 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n",
  397                     __func__, ipsec_address(&sav->sah->saidx.dst),
  398                     (u_long) ntohl(sav->spi)));
  399                 error = ENOBUFS;
  400                 goto bad;
  401         }
  402 
  403         /* Ok now, we can pass to the crypto processing. */
  404 
  405         /* Get crypto descriptors */
  406         crp = crypto_getreq(1);
  407         if (crp == NULL) {
  408                 ipcompstat.ipcomps_crypto++;
  409                 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
  410                 error = ENOBUFS;
  411                 goto bad;
  412         }
  413         crdc = crp->crp_desc;
  414 
  415         /* Compression descriptor */
  416         crdc->crd_skip = skip;
  417         crdc->crd_len = ralen;
  418         crdc->crd_flags = CRD_F_COMP;
  419         crdc->crd_inject = skip;
  420 
  421         /* Compression operation */
  422         crdc->crd_alg = ipcompx->type;
  423 
  424         /* IPsec-specific opaque crypto info */
  425         tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
  426                 M_XDATA, M_NOWAIT|M_ZERO);
  427         if (tc == NULL) {
  428                 ipcompstat.ipcomps_crypto++;
  429                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
  430                 crypto_freereq(crp);
  431                 error = ENOBUFS;
  432                 goto bad;
  433         }
  434 
  435         tc->tc_isr = isr;
  436         tc->tc_spi = sav->spi;
  437         tc->tc_dst = sav->sah->saidx.dst;
  438         tc->tc_proto = sav->sah->saidx.proto;
  439         tc->tc_protoff = protoff;
  440         tc->tc_skip = skip;
  441 
  442         /* Crypto operation descriptor */
  443         crp->crp_ilen = m->m_pkthdr.len;        /* Total input length */
  444         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
  445         crp->crp_buf = (caddr_t) m;
  446         crp->crp_callback = ipcomp_output_cb;
  447         crp->crp_opaque = (caddr_t) tc;
  448         crp->crp_sid = sav->tdb_cryptoid;
  449 
  450         return crypto_dispatch(crp);
  451 bad:
  452         if (m)
  453                 m_freem(m);
  454         return (error);
  455 }
  456 
  457 /*
  458  * IPComp output callback from the crypto driver.
  459  */
  460 static int
  461 ipcomp_output_cb(struct cryptop *crp)
  462 {
  463         struct tdb_crypto *tc;
  464         struct ipsecrequest *isr;
  465         struct secasvar *sav;
  466         struct mbuf *m;
  467         int error, skip;
  468 
  469         tc = (struct tdb_crypto *) crp->crp_opaque;
  470         IPSEC_ASSERT(tc != NULL, ("null opaque data area!"));
  471         m = (struct mbuf *) crp->crp_buf;
  472         skip = tc->tc_skip;
  473 
  474         isr = tc->tc_isr;
  475         IPSECREQUEST_LOCK(isr);
  476         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
  477         if (sav == NULL) {
  478                 ipcompstat.ipcomps_notdb++;
  479                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
  480                 error = ENOBUFS;                /*XXX*/
  481                 goto bad;
  482         }
  483         IPSEC_ASSERT(isr->sav == sav, ("SA changed\n"));
  484 
  485         /* Check for crypto errors */
  486         if (crp->crp_etype) {
  487                 /* Reset the session ID */
  488                 if (sav->tdb_cryptoid != 0)
  489                         sav->tdb_cryptoid = crp->crp_sid;
  490 
  491                 if (crp->crp_etype == EAGAIN) {
  492                         KEY_FREESAV(&sav);
  493                         IPSECREQUEST_UNLOCK(isr);
  494                         return crypto_dispatch(crp);
  495                 }
  496                 ipcompstat.ipcomps_noxform++;
  497                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  498                 error = crp->crp_etype;
  499                 goto bad;
  500         }
  501         /* Shouldn't happen... */
  502         if (m == NULL) {
  503                 ipcompstat.ipcomps_crypto++;
  504                 DPRINTF(("%s: bogus return buffer from crypto\n", __func__));
  505                 error = EINVAL;
  506                 goto bad;
  507         }
  508         ipcompstat.ipcomps_hist[sav->alg_comp]++;
  509 
  510         if (crp->crp_ilen - skip > crp->crp_olen) {
  511                 struct mbuf *mo;
  512                 struct ipcomp *ipcomp;
  513                 int roff;
  514                 uint8_t prot;
  515 
  516                 /* Compression helped, inject IPCOMP header. */
  517                 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
  518                 if (mo == NULL) {
  519                         ipcompstat.ipcomps_wrap++;
  520                         DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n",
  521                             __func__, ipsec_address(&sav->sah->saidx.dst),
  522                             (u_long) ntohl(sav->spi)));
  523                         error = ENOBUFS;
  524                         goto bad;
  525                 }
  526                 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
  527 
  528                 /* Initialize the IPCOMP header */
  529                 /* XXX alignment always correct? */
  530                 switch (sav->sah->saidx.dst.sa.sa_family) {
  531 #ifdef INET
  532                 case AF_INET:
  533                         ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
  534                         break;
  535 #endif /* INET */
  536 #ifdef INET6
  537                 case AF_INET6:
  538                         ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
  539                         break;
  540 #endif
  541                 }
  542                 ipcomp->comp_flags = 0;
  543                 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
  544 
  545                 /* Fix Next Protocol in IPv4/IPv6 header */
  546                 prot = IPPROTO_IPCOMP;
  547                 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t),
  548                     (u_char *)&prot);
  549 
  550                 /* Adjust the length in the IP header */
  551                 switch (sav->sah->saidx.dst.sa.sa_family) {
  552 #ifdef INET
  553                 case AF_INET:
  554                         mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
  555                         break;
  556 #endif /* INET */
  557 #ifdef INET6
  558                 case AF_INET6:
  559                         mtod(m, struct ip6_hdr *)->ip6_plen =
  560                                 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
  561                         break;
  562 #endif /* INET6 */
  563                 default:
  564                         ipcompstat.ipcomps_nopf++;
  565                         DPRINTF(("%s: unknown/unsupported protocol "
  566                             "family %d, IPCA %s/%08lx\n", __func__,
  567                             sav->sah->saidx.dst.sa.sa_family,
  568                             ipsec_address(&sav->sah->saidx.dst),
  569                             (u_long) ntohl(sav->spi)));
  570                         error = EPFNOSUPPORT;
  571                         goto bad;
  572                 }
  573         } else {
  574                 /* Compression was useless, we have lost time. */
  575                 ipcompstat.ipcomps_uncompr++;
  576                 DPRINTF(("%s: compressions was useless %d - %d <= %d\n",
  577                     __func__, crp->crp_ilen, skip, crp->crp_olen));
  578                 /* XXX remember state to not compress the next couple
  579                  *     of packets, RFC 3173, 2.2. Non-Expansion Policy */
  580         }
  581 
  582         /* Release the crypto descriptor */
  583         free(tc, M_XDATA);
  584         crypto_freereq(crp);
  585 
  586         /* NB: m is reclaimed by ipsec_process_done. */
  587         error = ipsec_process_done(m, isr);
  588         KEY_FREESAV(&sav);
  589         IPSECREQUEST_UNLOCK(isr);
  590         return error;
  591 bad:
  592         if (sav)
  593                 KEY_FREESAV(&sav);
  594         IPSECREQUEST_UNLOCK(isr);
  595         if (m)
  596                 m_freem(m);
  597         free(tc, M_XDATA);
  598         crypto_freereq(crp);
  599         return error;
  600 }
  601 
  602 static struct xformsw ipcomp_xformsw = {
  603         XF_IPCOMP,              XFT_COMP,               "IPcomp",
  604         ipcomp_init,            ipcomp_zeroize,         ipcomp_input,
  605         ipcomp_output
  606 };
  607 
  608 static void
  609 ipcomp_attach(void)
  610 {
  611 
  612         ipcompstat.version = IPCOMPSTAT_VERSION;
  613         xform_register(&ipcomp_xformsw);
  614 }
  615 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL);

Cache object: e555ac82eff508daee6a8028aa4182fc


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