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

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    1 /*      $FreeBSD: releng/5.3/sys/netipsec/xform_ipcomp.c 125099 2004-01-27 17:43:49Z sam $      */
    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 = 0;
   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 
  255                 ipcompstat.ipcomps_noxform++;
  256                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  257                 error = crp->crp_etype;
  258                 goto bad;
  259         }
  260         /* Shouldn't happen... */
  261         if (m == NULL) {
  262                 ipcompstat.ipcomps_crypto++;
  263                 DPRINTF(("%s: null mbuf returned from crypto\n", __func__));
  264                 error = EINVAL;
  265                 goto bad;
  266         }
  267         ipcompstat.ipcomps_hist[sav->alg_comp]++;
  268 
  269         clen = crp->crp_olen;           /* Length of data after processing */
  270 
  271         /* Release the crypto descriptors */
  272         free(tc, M_XDATA), tc = NULL;
  273         crypto_freereq(crp), crp = NULL;
  274 
  275         /* In case it's not done already, adjust the size of the mbuf chain */
  276         m->m_pkthdr.len = clen + hlen + skip;
  277 
  278         if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
  279                 ipcompstat.ipcomps_hdrops++;            /*XXX*/
  280                 DPRINTF(("%s: m_pullup failed\n", __func__));
  281                 error = EINVAL;                         /*XXX*/
  282                 goto bad;
  283         }
  284 
  285         /* Keep the next protocol field */
  286         addr = (caddr_t) mtod(m, struct ip *) + skip;
  287         nproto = ((struct ipcomp *) addr)->comp_nxt;
  288 
  289         /* Remove the IPCOMP header */
  290         error = m_striphdr(m, skip, hlen);
  291         if (error) {
  292                 ipcompstat.ipcomps_hdrops++;
  293                 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__,
  294                          ipsec_address(&sav->sah->saidx.dst),
  295                          (u_long) ntohl(sav->spi)));
  296                 goto bad;
  297         }
  298 
  299         /* Restore the Next Protocol field */
  300         m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
  301 
  302         IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
  303 
  304         KEY_FREESAV(&sav);
  305         return error;
  306 bad:
  307         if (sav)
  308                 KEY_FREESAV(&sav);
  309         if (m)
  310                 m_freem(m);
  311         if (tc != NULL)
  312                 free(tc, M_XDATA);
  313         if (crp)
  314                 crypto_freereq(crp);
  315         return error;
  316 }
  317 
  318 /*
  319  * IPComp output routine, called by ipsec[46]_process_packet()
  320  */
  321 static int
  322 ipcomp_output(
  323         struct mbuf *m,
  324         struct ipsecrequest *isr,
  325         struct mbuf **mp,
  326         int skip,
  327         int protoff
  328 )
  329 {
  330         struct secasvar *sav;
  331         struct comp_algo *ipcompx;
  332         int error, ralen, hlen, maxpacketsize, roff;
  333         u_int8_t prot;
  334         struct cryptodesc *crdc;
  335         struct cryptop *crp;
  336         struct tdb_crypto *tc;
  337         struct mbuf *mo;
  338         struct ipcomp *ipcomp;
  339 
  340         IPSEC_SPLASSERT_SOFTNET(__func__);
  341 
  342         sav = isr->sav;
  343         IPSEC_ASSERT(sav != NULL, ("null SA"));
  344         ipcompx = sav->tdb_compalgxform;
  345         IPSEC_ASSERT(ipcompx != NULL, ("null compression xform"));
  346 
  347         ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
  348         hlen = IPCOMP_HLENGTH;
  349 
  350         ipcompstat.ipcomps_output++;
  351 
  352         /* Check for maximum packet size violations. */
  353         switch (sav->sah->saidx.dst.sa.sa_family) {
  354 #ifdef INET
  355         case AF_INET:
  356                 maxpacketsize =  IP_MAXPACKET;
  357                 break;
  358 #endif /* INET */
  359 #ifdef INET6
  360         case AF_INET6:
  361                 maxpacketsize =  IPV6_MAXPACKET;
  362                 break;
  363 #endif /* INET6 */
  364         default:
  365                 ipcompstat.ipcomps_nopf++;
  366                 DPRINTF(("%s: unknown/unsupported protocol family %d, "
  367                     "IPCA %s/%08lx\n", __func__,
  368                     sav->sah->saidx.dst.sa.sa_family,
  369                     ipsec_address(&sav->sah->saidx.dst),
  370                     (u_long) ntohl(sav->spi)));
  371                 error = EPFNOSUPPORT;
  372                 goto bad;
  373         }
  374         if (skip + hlen + ralen > maxpacketsize) {
  375                 ipcompstat.ipcomps_toobig++;
  376                 DPRINTF(("%s: packet in IPCA %s/%08lx got too big "
  377                     "(len %u, max len %u)\n", __func__,
  378                     ipsec_address(&sav->sah->saidx.dst),
  379                     (u_long) ntohl(sav->spi),
  380                     skip + hlen + ralen, maxpacketsize));
  381                 error = EMSGSIZE;
  382                 goto bad;
  383         }
  384 
  385         /* Update the counters */
  386         ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip;
  387 
  388         m = m_clone(m);
  389         if (m == NULL) {
  390                 ipcompstat.ipcomps_hdrops++;
  391                 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n",
  392                     __func__, ipsec_address(&sav->sah->saidx.dst),
  393                     (u_long) ntohl(sav->spi)));
  394                 error = ENOBUFS;
  395                 goto bad;
  396         }
  397 
  398         /* Inject IPCOMP header */
  399         mo = m_makespace(m, skip, hlen, &roff);
  400         if (mo == NULL) {
  401                 ipcompstat.ipcomps_wrap++;
  402                 DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n",
  403                     __func__, ipsec_address(&sav->sah->saidx.dst),
  404                     (u_long) ntohl(sav->spi)));
  405                 error = ENOBUFS;
  406                 goto bad;
  407         }
  408         ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
  409 
  410         /* Initialize the IPCOMP header */
  411         /* XXX alignment always correct? */
  412         switch (sav->sah->saidx.dst.sa.sa_family) {
  413 #ifdef INET
  414         case AF_INET:
  415                 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
  416                 break;
  417 #endif /* INET */
  418 #ifdef INET6
  419         case AF_INET6:
  420                 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
  421                 break;
  422 #endif
  423         }
  424         ipcomp->comp_flags = 0;
  425         ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
  426 
  427         /* Fix Next Protocol in IPv4/IPv6 header */
  428         prot = IPPROTO_IPCOMP;
  429         m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot);
  430 
  431         /* Ok now, we can pass to the crypto processing */
  432 
  433         /* Get crypto descriptors */
  434         crp = crypto_getreq(1);
  435         if (crp == NULL) {
  436                 ipcompstat.ipcomps_crypto++;
  437                 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
  438                 error = ENOBUFS;
  439                 goto bad;
  440         }
  441         crdc = crp->crp_desc;
  442 
  443         /* Compression descriptor */
  444         crdc->crd_skip = skip + hlen;
  445         crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
  446         crdc->crd_flags = CRD_F_COMP;
  447         crdc->crd_inject = skip + hlen;
  448 
  449         /* Compression operation */
  450         crdc->crd_alg = ipcompx->type;
  451 
  452         /* IPsec-specific opaque crypto info */
  453         tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
  454                 M_XDATA, M_NOWAIT|M_ZERO);
  455         if (tc == NULL) {
  456                 ipcompstat.ipcomps_crypto++;
  457                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
  458                 crypto_freereq(crp);
  459                 error = ENOBUFS;
  460                 goto bad;
  461         }
  462 
  463         tc->tc_isr = isr;
  464         tc->tc_spi = sav->spi;
  465         tc->tc_dst = sav->sah->saidx.dst;
  466         tc->tc_proto = sav->sah->saidx.proto;
  467         tc->tc_skip = skip + hlen;
  468 
  469         /* Crypto operation descriptor */
  470         crp->crp_ilen = m->m_pkthdr.len;        /* Total input length */
  471         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
  472         crp->crp_buf = (caddr_t) m;
  473         crp->crp_callback = ipcomp_output_cb;
  474         crp->crp_opaque = (caddr_t) tc;
  475         crp->crp_sid = sav->tdb_cryptoid;
  476 
  477         return crypto_dispatch(crp);
  478 bad:
  479         if (m)
  480                 m_freem(m);
  481         return (error);
  482 }
  483 
  484 /*
  485  * IPComp output callback from the crypto driver.
  486  */
  487 static int
  488 ipcomp_output_cb(struct cryptop *crp)
  489 {
  490         struct tdb_crypto *tc;
  491         struct ipsecrequest *isr;
  492         struct secasvar *sav;
  493         struct mbuf *m;
  494         int error, skip, rlen;
  495 
  496         tc = (struct tdb_crypto *) crp->crp_opaque;
  497         IPSEC_ASSERT(tc != NULL, ("null opaque data area!"));
  498         m = (struct mbuf *) crp->crp_buf;
  499         skip = tc->tc_skip;
  500         rlen = crp->crp_ilen - skip;
  501 
  502         isr = tc->tc_isr;
  503         IPSECREQUEST_LOCK(isr);
  504         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
  505         if (sav == NULL) {
  506                 ipcompstat.ipcomps_notdb++;
  507                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
  508                 error = ENOBUFS;                /*XXX*/
  509                 goto bad;
  510         }
  511         IPSEC_ASSERT(isr->sav == sav, ("SA changed\n"));
  512 
  513         /* Check for crypto errors */
  514         if (crp->crp_etype) {
  515                 /* Reset session ID */
  516                 if (sav->tdb_cryptoid != 0)
  517                         sav->tdb_cryptoid = crp->crp_sid;
  518 
  519                 if (crp->crp_etype == EAGAIN) {
  520                         KEY_FREESAV(&sav);
  521                         IPSECREQUEST_UNLOCK(isr);
  522                         return crypto_dispatch(crp);
  523                 }
  524                 ipcompstat.ipcomps_noxform++;
  525                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  526                 error = crp->crp_etype;
  527                 goto bad;
  528         }
  529         /* Shouldn't happen... */
  530         if (m == NULL) {
  531                 ipcompstat.ipcomps_crypto++;
  532                 DPRINTF(("%s: bogus return buffer from crypto\n", __func__));
  533                 error = EINVAL;
  534                 goto bad;
  535         }
  536         ipcompstat.ipcomps_hist[sav->alg_comp]++;
  537 
  538         if (rlen > crp->crp_olen) {
  539                 /* Adjust the length in the IP header */
  540                 switch (sav->sah->saidx.dst.sa.sa_family) {
  541 #ifdef INET
  542                 case AF_INET:
  543                         mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
  544                         break;
  545 #endif /* INET */
  546 #ifdef INET6
  547                 case AF_INET6:
  548                         mtod(m, struct ip6_hdr *)->ip6_plen =
  549                                 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
  550                         break;
  551 #endif /* INET6 */
  552                 default:
  553                         ipcompstat.ipcomps_nopf++;
  554                         DPRINTF(("%s: unknown/unsupported protocol "
  555                             "family %d, IPCA %s/%08lx\n", __func__,
  556                             sav->sah->saidx.dst.sa.sa_family,
  557                             ipsec_address(&sav->sah->saidx.dst), 
  558                             (u_long) ntohl(sav->spi)));
  559                         error = EPFNOSUPPORT;
  560                         goto bad;
  561                 }
  562         } else {
  563                 /* compression was useless, we have lost time */
  564                 /* XXX add statistic */
  565         }
  566 
  567         /* Release the crypto descriptor */
  568         free(tc, M_XDATA);
  569         crypto_freereq(crp);
  570 
  571         /* NB: m is reclaimed by ipsec_process_done. */
  572         error = ipsec_process_done(m, isr);
  573         KEY_FREESAV(&sav);
  574         IPSECREQUEST_UNLOCK(isr);
  575 
  576         return error;
  577 bad:
  578         if (sav)
  579                 KEY_FREESAV(&sav);
  580         IPSECREQUEST_UNLOCK(isr);
  581         if (m)
  582                 m_freem(m);
  583         free(tc, M_XDATA);
  584         crypto_freereq(crp);
  585         return error;
  586 }
  587 
  588 static struct xformsw ipcomp_xformsw = {
  589         XF_IPCOMP,              XFT_COMP,               "IPcomp",
  590         ipcomp_init,            ipcomp_zeroize,         ipcomp_input,
  591         ipcomp_output
  592 };
  593 
  594 static void
  595 ipcomp_attach(void)
  596 {
  597         xform_register(&ipcomp_xformsw);
  598 }
  599 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL);

Cache object: 3d0532d60131db0e7d23d70ff5325786


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