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: stable/4/sys/netipsec/xform_ipcomp.c 117175 2003-07-02 17:06:55Z 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/socket.h>
   39 #include <sys/kernel.h>
   40 #include <sys/protosw.h>
   41 #include <sys/sysctl.h>
   42 
   43 #include <netinet/in.h>
   44 #include <netinet/in_systm.h>
   45 #include <netinet/ip.h>
   46 #include <netinet/ip_var.h>
   47 
   48 #include <net/route.h>
   49 #include <netipsec/ipsec.h>
   50 #include <netipsec/xform.h>
   51 
   52 #ifdef INET6
   53 #include <netinet/ip6.h>
   54 #include <netipsec/ipsec6.h>
   55 #endif
   56 
   57 #include <netipsec/ipcomp.h>
   58 #include <netipsec/ipcomp_var.h>
   59 
   60 #include <netipsec/key.h>
   61 #include <netipsec/key_debug.h>
   62 
   63 #include <opencrypto/cryptodev.h>
   64 #include <opencrypto/deflate.h>
   65 #include <opencrypto/xform.h>
   66 
   67 int     ipcomp_enable = 0;
   68 struct  ipcompstat ipcompstat;
   69 
   70 SYSCTL_DECL(_net_inet_ipcomp);
   71 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO,
   72         ipcomp_enable,  CTLFLAG_RW,     &ipcomp_enable, 0, "");
   73 SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS,
   74         stats,          CTLFLAG_RD,     &ipcompstat,    ipcompstat, "");
   75 
   76 static int ipcomp_input_cb(struct cryptop *crp);
   77 static int ipcomp_output_cb(struct cryptop *crp);
   78 
   79 struct comp_algo *
   80 ipcomp_algorithm_lookup(int alg)
   81 {
   82         if (alg >= IPCOMP_ALG_MAX)
   83                 return NULL;
   84         switch (alg) {
   85         case SADB_X_CALG_DEFLATE:
   86                 return &comp_algo_deflate;
   87         }
   88         return NULL;
   89 }
   90 
   91 /*
   92  * ipcomp_init() is called when an CPI is being set up.
   93  */
   94 static int
   95 ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
   96 {
   97         struct comp_algo *tcomp;
   98         struct cryptoini cric;
   99 
  100         /* NB: algorithm really comes in alg_enc and not alg_comp! */
  101         tcomp = ipcomp_algorithm_lookup(sav->alg_enc);
  102         if (tcomp == NULL) {
  103                 DPRINTF(("ipcomp_init: unsupported compression algorithm %d\n",
  104                          sav->alg_comp));
  105                 return EINVAL;
  106         }
  107         sav->alg_comp = sav->alg_enc;           /* set for doing histogram */
  108         sav->tdb_xform = xsp;
  109         sav->tdb_compalgxform = tcomp;
  110 
  111         /* Initialize crypto session */
  112         bzero(&cric, sizeof (cric));
  113         cric.cri_alg = sav->tdb_compalgxform->type;
  114 
  115         return crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support);
  116 }
  117 
  118 /*
  119  * ipcomp_zeroize() used when IPCA is deleted
  120  */
  121 static int
  122 ipcomp_zeroize(struct secasvar *sav)
  123 {
  124         int err;
  125 
  126         err = crypto_freesession(sav->tdb_cryptoid);
  127         sav->tdb_cryptoid = 0;
  128         return err;
  129 }
  130 
  131 /*
  132  * ipcomp_input() gets called to uncompress an input packet
  133  */
  134 static int
  135 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  136 {
  137         struct tdb_crypto *tc;
  138         struct cryptodesc *crdc;
  139         struct cryptop *crp;
  140         int hlen = IPCOMP_HLENGTH;
  141 
  142         SPLASSERT(net, "ipcomp_input");
  143 
  144         /* Get crypto descriptors */
  145         crp = crypto_getreq(1);
  146         if (crp == NULL) {
  147                 m_freem(m);
  148                 DPRINTF(("ipcomp_input: no crypto descriptors\n"));
  149                 ipcompstat.ipcomps_crypto++;
  150                 return ENOBUFS;
  151         }
  152         /* Get IPsec-specific opaque pointer */
  153         tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO);
  154         if (tc == NULL) {
  155                 m_freem(m);
  156                 crypto_freereq(crp);
  157                 DPRINTF(("ipcomp_input: cannot allocate tdb_crypto\n"));
  158                 ipcompstat.ipcomps_crypto++;
  159                 return ENOBUFS;
  160         }
  161         crdc = crp->crp_desc;
  162 
  163         crdc->crd_skip = skip + hlen;
  164         crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
  165         crdc->crd_inject = skip;
  166 
  167         tc->tc_ptr = 0;
  168 
  169         /* Decompression operation */
  170         crdc->crd_alg = sav->tdb_compalgxform->type;
  171 
  172         /* Crypto operation descriptor */
  173         crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
  174         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
  175         crp->crp_buf = (caddr_t) m;
  176         crp->crp_callback = ipcomp_input_cb;
  177         crp->crp_sid = sav->tdb_cryptoid;
  178         crp->crp_opaque = (caddr_t) tc;
  179 
  180         /* These are passed as-is to the callback */
  181         tc->tc_spi = sav->spi;
  182         tc->tc_dst = sav->sah->saidx.dst;
  183         tc->tc_proto = sav->sah->saidx.proto;
  184         tc->tc_protoff = protoff;
  185         tc->tc_skip = skip;
  186 
  187         return crypto_dispatch(crp);
  188 }
  189 
  190 #ifdef INET6
  191 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do {              \
  192         if (saidx->dst.sa.sa_family == AF_INET6) {                           \
  193                 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
  194         } else {                                                             \
  195                 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
  196         }                                                                    \
  197 } while (0)
  198 #else
  199 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag)                   \
  200         (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
  201 #endif
  202 
  203 /*
  204  * IPComp input callback from the crypto driver.
  205  */
  206 static int
  207 ipcomp_input_cb(struct cryptop *crp)
  208 {
  209         struct cryptodesc *crd;
  210         struct tdb_crypto *tc;
  211         int skip, protoff;
  212         struct mtag *mtag;
  213         struct mbuf *m;
  214         struct secasvar *sav;
  215         struct secasindex *saidx;
  216         int s, hlen = IPCOMP_HLENGTH, error, clen;
  217         u_int8_t nproto;
  218         caddr_t addr;
  219 
  220         crd = crp->crp_desc;
  221 
  222         tc = (struct tdb_crypto *) crp->crp_opaque;
  223         KASSERT(tc != NULL, ("ipcomp_input_cb: null opaque crypto data area!"));
  224         skip = tc->tc_skip;
  225         protoff = tc->tc_protoff;
  226         mtag = (struct mtag *) tc->tc_ptr;
  227         m = (struct mbuf *) crp->crp_buf;
  228 
  229         s = splnet();
  230 
  231         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
  232         if (sav == NULL) {
  233                 ipcompstat.ipcomps_notdb++;
  234                 DPRINTF(("ipcomp_input_cb: SA expired while in crypto\n"));
  235                 error = ENOBUFS;                /*XXX*/
  236                 goto bad;
  237         }
  238 
  239         saidx = &sav->sah->saidx;
  240         KASSERT(saidx->dst.sa.sa_family == AF_INET ||
  241                 saidx->dst.sa.sa_family == AF_INET6,
  242                 ("ah_input_cb: unexpected protocol family %u",
  243                  saidx->dst.sa.sa_family));
  244 
  245         /* Check for crypto errors */
  246         if (crp->crp_etype) {
  247                 /* Reset the session ID */
  248                 if (sav->tdb_cryptoid != 0)
  249                         sav->tdb_cryptoid = crp->crp_sid;
  250 
  251                 if (crp->crp_etype == EAGAIN) {
  252                         KEY_FREESAV(&sav);
  253                         splx(s);
  254                         return crypto_dispatch(crp);
  255                 }
  256 
  257                 ipcompstat.ipcomps_noxform++;
  258                 DPRINTF(("ipcomp_input_cb: crypto error %d\n", crp->crp_etype));
  259                 error = crp->crp_etype;
  260                 goto bad;
  261         }
  262         /* Shouldn't happen... */
  263         if (m == NULL) {
  264                 ipcompstat.ipcomps_crypto++;
  265                 DPRINTF(("ipcomp_input_cb: null mbuf returned from crypto\n"));
  266                 error = EINVAL;
  267                 goto bad;
  268         }
  269         ipcompstat.ipcomps_hist[sav->alg_comp]++;
  270 
  271         clen = crp->crp_olen;           /* Length of data after processing */
  272 
  273         /* Release the crypto descriptors */
  274         free(tc, M_XDATA), tc = NULL;
  275         crypto_freereq(crp), crp = NULL;
  276 
  277         /* In case it's not done already, adjust the size of the mbuf chain */
  278         m->m_pkthdr.len = clen + hlen + skip;
  279 
  280         if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
  281                 ipcompstat.ipcomps_hdrops++;            /*XXX*/
  282                 DPRINTF(("ipcomp_input_cb: m_pullup failed\n"));
  283                 error = EINVAL;                         /*XXX*/
  284                 goto bad;
  285         }
  286 
  287         /* Keep the next protocol field */
  288         addr = (caddr_t) mtod(m, struct ip *) + skip;
  289         nproto = ((struct ipcomp *) addr)->comp_nxt;
  290 
  291         /* Remove the IPCOMP header */
  292         error = m_striphdr(m, skip, hlen);
  293         if (error) {
  294                 ipcompstat.ipcomps_hdrops++;
  295                 DPRINTF(("ipcomp_input_cb: bad mbuf chain, IPCA %s/%08lx\n",
  296                          ipsec_address(&sav->sah->saidx.dst),
  297                          (u_long) ntohl(sav->spi)));
  298                 goto bad;
  299         }
  300 
  301         /* Restore the Next Protocol field */
  302         m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
  303 
  304         IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
  305 
  306         KEY_FREESAV(&sav);
  307         splx(s);
  308         return error;
  309 bad:
  310         if (sav)
  311                 KEY_FREESAV(&sav);
  312         splx(s);
  313         if (m)
  314                 m_freem(m);
  315         if (tc != NULL)
  316                 free(tc, M_XDATA);
  317         if (crp)
  318                 crypto_freereq(crp);
  319         return error;
  320 }
  321 
  322 /*
  323  * IPComp output routine, called by ipsec[46]_process_packet()
  324  */
  325 static int
  326 ipcomp_output(
  327         struct mbuf *m,
  328         struct ipsecrequest *isr,
  329         struct mbuf **mp,
  330         int skip,
  331         int protoff
  332 )
  333 {
  334         struct secasvar *sav;
  335         struct comp_algo *ipcompx;
  336         int error, ralen, hlen, maxpacketsize, roff;
  337         u_int8_t prot;
  338         struct cryptodesc *crdc;
  339         struct cryptop *crp;
  340         struct tdb_crypto *tc;
  341         struct mbuf *mo;
  342         struct ipcomp *ipcomp;
  343 
  344         SPLASSERT(net, "ipcomp_output");
  345 
  346         sav = isr->sav;
  347         KASSERT(sav != NULL, ("ipcomp_output: null SA"));
  348         ipcompx = sav->tdb_compalgxform;
  349         KASSERT(ipcompx != NULL, ("ipcomp_output: null compression xform"));
  350 
  351         ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
  352         hlen = IPCOMP_HLENGTH;
  353 
  354         ipcompstat.ipcomps_output++;
  355 
  356         /* Check for maximum packet size violations. */
  357         switch (sav->sah->saidx.dst.sa.sa_family) {
  358 #ifdef INET
  359         case AF_INET:
  360                 maxpacketsize =  IP_MAXPACKET;
  361                 break;
  362 #endif /* INET */
  363 #ifdef INET6
  364         case AF_INET6:
  365                 maxpacketsize =  IPV6_MAXPACKET;
  366                 break;
  367 #endif /* INET6 */
  368         default:
  369                 ipcompstat.ipcomps_nopf++;
  370                 DPRINTF(("ipcomp_output: unknown/unsupported protocol family %d"
  371                     ", IPCA %s/%08lx\n", 
  372                     sav->sah->saidx.dst.sa.sa_family,
  373                     ipsec_address(&sav->sah->saidx.dst),
  374                     (u_long) ntohl(sav->spi)));
  375                 error = EPFNOSUPPORT;
  376                 goto bad;
  377         }
  378         if (skip + hlen + ralen > maxpacketsize) {
  379                 ipcompstat.ipcomps_toobig++;
  380                 DPRINTF(("ipcomp_output: packet in IPCA %s/%08lx got too big "
  381                     "(len %u, max len %u)\n",
  382                     ipsec_address(&sav->sah->saidx.dst),
  383                     (u_long) ntohl(sav->spi),
  384                     skip + hlen + ralen, maxpacketsize));
  385                 error = EMSGSIZE;
  386                 goto bad;
  387         }
  388 
  389         /* Update the counters */
  390         ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip;
  391 
  392         m = m_clone(m);
  393         if (m == NULL) {
  394                 ipcompstat.ipcomps_hdrops++;
  395                 DPRINTF(("ipcomp_output: cannot clone mbuf chain, IPCA %s/%08lx\n", 
  396                     ipsec_address(&sav->sah->saidx.dst),
  397                     (u_long) ntohl(sav->spi)));
  398                 error = ENOBUFS;
  399                 goto bad;
  400         }
  401 
  402         /* Inject IPCOMP header */
  403         mo = m_makespace(m, skip, hlen, &roff);
  404         if (mo == NULL) {
  405                 ipcompstat.ipcomps_wrap++;
  406                 DPRINTF(("ipcomp_output: failed to inject IPCOMP header for "
  407                     "IPCA %s/%08lx\n",
  408                     ipsec_address(&sav->sah->saidx.dst),
  409                     (u_long) ntohl(sav->spi)));
  410                 error = ENOBUFS;
  411                 goto bad;
  412         }
  413         ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
  414 
  415         /* Initialize the IPCOMP header */
  416         /* XXX alignment always correct? */
  417         switch (sav->sah->saidx.dst.sa.sa_family) {
  418 #ifdef INET
  419         case AF_INET:
  420                 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
  421                 break;
  422 #endif /* INET */
  423 #ifdef INET6
  424         case AF_INET6:
  425                 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
  426                 break;
  427 #endif
  428         }
  429         ipcomp->comp_flags = 0;
  430         ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
  431 
  432         /* Fix Next Protocol in IPv4/IPv6 header */
  433         prot = IPPROTO_IPCOMP;
  434         m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot);
  435 
  436         /* Ok now, we can pass to the crypto processing */
  437 
  438         /* Get crypto descriptors */
  439         crp = crypto_getreq(1);
  440         if (crp == NULL) {
  441                 ipcompstat.ipcomps_crypto++;
  442                 DPRINTF(("ipcomp_output: failed to acquire crypto descriptor\n"));
  443                 error = ENOBUFS;
  444                 goto bad;
  445         }
  446         crdc = crp->crp_desc;
  447 
  448         /* Compression descriptor */
  449         crdc->crd_skip = skip + hlen;
  450         crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
  451         crdc->crd_flags = CRD_F_COMP;
  452         crdc->crd_inject = skip + hlen;
  453 
  454         /* Compression operation */
  455         crdc->crd_alg = ipcompx->type;
  456 
  457         /* IPsec-specific opaque crypto info */
  458         tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
  459                 M_XDATA, M_NOWAIT|M_ZERO);
  460         if (tc == NULL) {
  461                 ipcompstat.ipcomps_crypto++;
  462                 DPRINTF(("ipcomp_output: failed to allocate tdb_crypto\n"));
  463                 crypto_freereq(crp);
  464                 error = ENOBUFS;
  465                 goto bad;
  466         }
  467 
  468         tc->tc_isr = isr;
  469         tc->tc_spi = sav->spi;
  470         tc->tc_dst = sav->sah->saidx.dst;
  471         tc->tc_proto = sav->sah->saidx.proto;
  472         tc->tc_skip = skip + hlen;
  473 
  474         /* Crypto operation descriptor */
  475         crp->crp_ilen = m->m_pkthdr.len;        /* Total input length */
  476         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
  477         crp->crp_buf = (caddr_t) m;
  478         crp->crp_callback = ipcomp_output_cb;
  479         crp->crp_opaque = (caddr_t) tc;
  480         crp->crp_sid = sav->tdb_cryptoid;
  481 
  482         return crypto_dispatch(crp);
  483 bad:
  484         if (m)
  485                 m_freem(m);
  486         return (error);
  487 }
  488 
  489 /*
  490  * IPComp output callback from the crypto driver.
  491  */
  492 static int
  493 ipcomp_output_cb(struct cryptop *crp)
  494 {
  495         struct tdb_crypto *tc;
  496         struct ipsecrequest *isr;
  497         struct secasvar *sav;
  498         struct mbuf *m;
  499         int s, error, skip, rlen;
  500 
  501         tc = (struct tdb_crypto *) crp->crp_opaque;
  502         KASSERT(tc != NULL, ("ipcomp_output_cb: null opaque data area!"));
  503         m = (struct mbuf *) crp->crp_buf;
  504         skip = tc->tc_skip;
  505         rlen = crp->crp_ilen - skip;
  506 
  507         s = splnet();
  508 
  509         isr = tc->tc_isr;
  510         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
  511         if (sav == NULL) {
  512                 ipcompstat.ipcomps_notdb++;
  513                 DPRINTF(("ipcomp_output_cb: SA expired while in crypto\n"));
  514                 error = ENOBUFS;                /*XXX*/
  515                 goto bad;
  516         }
  517         KASSERT(isr->sav == sav, ("ipcomp_output_cb: SA changed\n"));
  518 
  519         /* Check for crypto errors */
  520         if (crp->crp_etype) {
  521                 /* Reset session ID */
  522                 if (sav->tdb_cryptoid != 0)
  523                         sav->tdb_cryptoid = crp->crp_sid;
  524 
  525                 if (crp->crp_etype == EAGAIN) {
  526                         KEY_FREESAV(&sav);
  527                         splx(s);
  528                         return crypto_dispatch(crp);
  529                 }
  530                 ipcompstat.ipcomps_noxform++;
  531                 DPRINTF(("ipcomp_output_cb: crypto error %d\n", crp->crp_etype));
  532                 error = crp->crp_etype;
  533                 goto bad;
  534         }
  535         /* Shouldn't happen... */
  536         if (m == NULL) {
  537                 ipcompstat.ipcomps_crypto++;
  538                 DPRINTF(("ipcomp_output_cb: bogus return buffer from crypto\n"));
  539                 error = EINVAL;
  540                 goto bad;
  541         }
  542         ipcompstat.ipcomps_hist[sav->alg_comp]++;
  543 
  544         if (rlen > crp->crp_olen) {
  545                 /* Adjust the length in the IP header */
  546                 switch (sav->sah->saidx.dst.sa.sa_family) {
  547 #ifdef INET
  548                 case AF_INET:
  549                         mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
  550                         break;
  551 #endif /* INET */
  552 #ifdef INET6
  553                 case AF_INET6:
  554                         mtod(m, struct ip6_hdr *)->ip6_plen =
  555                                 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
  556                         break;
  557 #endif /* INET6 */
  558                 default:
  559                         ipcompstat.ipcomps_nopf++;
  560                         DPRINTF(("ipcomp_output: unknown/unsupported protocol "
  561                             "family %d, IPCA %s/%08lx\n", 
  562                             sav->sah->saidx.dst.sa.sa_family,
  563                             ipsec_address(&sav->sah->saidx.dst), 
  564                             (u_long) ntohl(sav->spi)));
  565                         error = EPFNOSUPPORT;
  566                         goto bad;
  567                 }
  568         } else {
  569                 /* compression was useless, we have lost time */
  570                 /* XXX add statistic */
  571         }
  572 
  573         /* Release the crypto descriptor */
  574         free(tc, M_XDATA);
  575         crypto_freereq(crp);
  576 
  577         /* NB: m is reclaimed by ipsec_process_done. */
  578         error = ipsec_process_done(m, isr);
  579         KEY_FREESAV(&sav);
  580         splx(s);
  581         return error;
  582 bad:
  583         if (sav)
  584                 KEY_FREESAV(&sav);
  585         splx(s);
  586         if (m)
  587                 m_freem(m);
  588         free(tc, M_XDATA);
  589         crypto_freereq(crp);
  590         return error;
  591 }
  592 
  593 static struct xformsw ipcomp_xformsw = {
  594         XF_IPCOMP,              XFT_COMP,               "IPcomp",
  595         ipcomp_init,            ipcomp_zeroize,         ipcomp_input,
  596         ipcomp_output
  597 };
  598 
  599 static void
  600 ipcomp_attach(void)
  601 {
  602         xform_register(&ipcomp_xformsw);
  603 }
  604 SYSINIT(ipcomp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipcomp_attach, NULL)

Cache object: 836991d41035f28833b97d383d44c67b


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