The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /*      $FreeBSD: releng/6.3/sys/netipsec/xform_ipcomp.c 161999 2006-09-04 15:17:50Z pjd $      */
    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         NET_LOCK_GIANT();
  223 
  224         crd = crp->crp_desc;
  225 
  226         tc = (struct tdb_crypto *) crp->crp_opaque;
  227         IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!"));
  228         skip = tc->tc_skip;
  229         protoff = tc->tc_protoff;
  230         mtag = (struct mtag *) tc->tc_ptr;
  231         m = (struct mbuf *) crp->crp_buf;
  232 
  233         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
  234         if (sav == NULL) {
  235                 ipcompstat.ipcomps_notdb++;
  236                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
  237                 error = ENOBUFS;                /*XXX*/
  238                 goto bad;
  239         }
  240 
  241         saidx = &sav->sah->saidx;
  242         IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
  243                 saidx->dst.sa.sa_family == AF_INET6,
  244                 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
  245 
  246         /* Check for crypto errors */
  247         if (crp->crp_etype) {
  248                 /* Reset the session ID */
  249                 if (sav->tdb_cryptoid != 0)
  250                         sav->tdb_cryptoid = crp->crp_sid;
  251 
  252                 if (crp->crp_etype == EAGAIN) {
  253                         KEY_FREESAV(&sav);
  254                         error = crypto_dispatch(crp);
  255                         NET_UNLOCK_GIANT();
  256                         return error;
  257                 }
  258 
  259                 ipcompstat.ipcomps_noxform++;
  260                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  261                 error = crp->crp_etype;
  262                 goto bad;
  263         }
  264         /* Shouldn't happen... */
  265         if (m == NULL) {
  266                 ipcompstat.ipcomps_crypto++;
  267                 DPRINTF(("%s: null mbuf returned from crypto\n", __func__));
  268                 error = EINVAL;
  269                 goto bad;
  270         }
  271         ipcompstat.ipcomps_hist[sav->alg_comp]++;
  272 
  273         clen = crp->crp_olen;           /* Length of data after processing */
  274 
  275         /* Release the crypto descriptors */
  276         free(tc, M_XDATA), tc = NULL;
  277         crypto_freereq(crp), crp = NULL;
  278 
  279         /* In case it's not done already, adjust the size of the mbuf chain */
  280         m->m_pkthdr.len = clen + hlen + skip;
  281 
  282         if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
  283                 ipcompstat.ipcomps_hdrops++;            /*XXX*/
  284                 DPRINTF(("%s: m_pullup failed\n", __func__));
  285                 error = EINVAL;                         /*XXX*/
  286                 goto bad;
  287         }
  288 
  289         /* Keep the next protocol field */
  290         addr = (caddr_t) mtod(m, struct ip *) + skip;
  291         nproto = ((struct ipcomp *) addr)->comp_nxt;
  292 
  293         /* Remove the IPCOMP header */
  294         error = m_striphdr(m, skip, hlen);
  295         if (error) {
  296                 ipcompstat.ipcomps_hdrops++;
  297                 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__,
  298                          ipsec_address(&sav->sah->saidx.dst),
  299                          (u_long) ntohl(sav->spi)));
  300                 goto bad;
  301         }
  302 
  303         /* Restore the Next Protocol field */
  304         m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
  305 
  306         IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
  307 
  308         KEY_FREESAV(&sav);
  309         NET_UNLOCK_GIANT();
  310         return error;
  311 bad:
  312         if (sav)
  313                 KEY_FREESAV(&sav);
  314         if (m)
  315                 m_freem(m);
  316         if (tc != NULL)
  317                 free(tc, M_XDATA);
  318         if (crp)
  319                 crypto_freereq(crp);
  320         NET_UNLOCK_GIANT();
  321         return error;
  322 }
  323 
  324 /*
  325  * IPComp output routine, called by ipsec[46]_process_packet()
  326  */
  327 static int
  328 ipcomp_output(
  329         struct mbuf *m,
  330         struct ipsecrequest *isr,
  331         struct mbuf **mp,
  332         int skip,
  333         int protoff
  334 )
  335 {
  336         struct secasvar *sav;
  337         struct comp_algo *ipcompx;
  338         int error, ralen, hlen, maxpacketsize, roff;
  339         u_int8_t prot;
  340         struct cryptodesc *crdc;
  341         struct cryptop *crp;
  342         struct tdb_crypto *tc;
  343         struct mbuf *mo;
  344         struct ipcomp *ipcomp;
  345 
  346         IPSEC_SPLASSERT_SOFTNET(__func__);
  347 
  348         sav = isr->sav;
  349         IPSEC_ASSERT(sav != NULL, ("null SA"));
  350         ipcompx = sav->tdb_compalgxform;
  351         IPSEC_ASSERT(ipcompx != NULL, ("null compression xform"));
  352 
  353         ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
  354         hlen = IPCOMP_HLENGTH;
  355 
  356         ipcompstat.ipcomps_output++;
  357 
  358         /* Check for maximum packet size violations. */
  359         switch (sav->sah->saidx.dst.sa.sa_family) {
  360 #ifdef INET
  361         case AF_INET:
  362                 maxpacketsize =  IP_MAXPACKET;
  363                 break;
  364 #endif /* INET */
  365 #ifdef INET6
  366         case AF_INET6:
  367                 maxpacketsize =  IPV6_MAXPACKET;
  368                 break;
  369 #endif /* INET6 */
  370         default:
  371                 ipcompstat.ipcomps_nopf++;
  372                 DPRINTF(("%s: unknown/unsupported protocol family %d, "
  373                     "IPCA %s/%08lx\n", __func__,
  374                     sav->sah->saidx.dst.sa.sa_family,
  375                     ipsec_address(&sav->sah->saidx.dst),
  376                     (u_long) ntohl(sav->spi)));
  377                 error = EPFNOSUPPORT;
  378                 goto bad;
  379         }
  380         if (skip + hlen + ralen > maxpacketsize) {
  381                 ipcompstat.ipcomps_toobig++;
  382                 DPRINTF(("%s: packet in IPCA %s/%08lx got too big "
  383                     "(len %u, max len %u)\n", __func__,
  384                     ipsec_address(&sav->sah->saidx.dst),
  385                     (u_long) ntohl(sav->spi),
  386                     skip + hlen + ralen, maxpacketsize));
  387                 error = EMSGSIZE;
  388                 goto bad;
  389         }
  390 
  391         /* Update the counters */
  392         ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip;
  393 
  394         m = m_unshare(m, M_NOWAIT);
  395         if (m == NULL) {
  396                 ipcompstat.ipcomps_hdrops++;
  397                 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n",
  398                     __func__, ipsec_address(&sav->sah->saidx.dst),
  399                     (u_long) ntohl(sav->spi)));
  400                 error = ENOBUFS;
  401                 goto bad;
  402         }
  403 
  404         /* Inject IPCOMP header */
  405         mo = m_makespace(m, skip, hlen, &roff);
  406         if (mo == NULL) {
  407                 ipcompstat.ipcomps_wrap++;
  408                 DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n",
  409                     __func__, ipsec_address(&sav->sah->saidx.dst),
  410                     (u_long) ntohl(sav->spi)));
  411                 error = ENOBUFS;
  412                 goto bad;
  413         }
  414         ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
  415 
  416         /* Initialize the IPCOMP header */
  417         /* XXX alignment always correct? */
  418         switch (sav->sah->saidx.dst.sa.sa_family) {
  419 #ifdef INET
  420         case AF_INET:
  421                 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
  422                 break;
  423 #endif /* INET */
  424 #ifdef INET6
  425         case AF_INET6:
  426                 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
  427                 break;
  428 #endif
  429         }
  430         ipcomp->comp_flags = 0;
  431         ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
  432 
  433         /* Fix Next Protocol in IPv4/IPv6 header */
  434         prot = IPPROTO_IPCOMP;
  435         m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot);
  436 
  437         /* Ok now, we can pass to the crypto processing */
  438 
  439         /* Get crypto descriptors */
  440         crp = crypto_getreq(1);
  441         if (crp == NULL) {
  442                 ipcompstat.ipcomps_crypto++;
  443                 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
  444                 error = ENOBUFS;
  445                 goto bad;
  446         }
  447         crdc = crp->crp_desc;
  448 
  449         /* Compression descriptor */
  450         crdc->crd_skip = skip + hlen;
  451         crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
  452         crdc->crd_flags = CRD_F_COMP;
  453         crdc->crd_inject = skip + hlen;
  454 
  455         /* Compression operation */
  456         crdc->crd_alg = ipcompx->type;
  457 
  458         /* IPsec-specific opaque crypto info */
  459         tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
  460                 M_XDATA, M_NOWAIT|M_ZERO);
  461         if (tc == NULL) {
  462                 ipcompstat.ipcomps_crypto++;
  463                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
  464                 crypto_freereq(crp);
  465                 error = ENOBUFS;
  466                 goto bad;
  467         }
  468 
  469         tc->tc_isr = isr;
  470         tc->tc_spi = sav->spi;
  471         tc->tc_dst = sav->sah->saidx.dst;
  472         tc->tc_proto = sav->sah->saidx.proto;
  473         tc->tc_skip = skip + hlen;
  474 
  475         /* Crypto operation descriptor */
  476         crp->crp_ilen = m->m_pkthdr.len;        /* Total input length */
  477         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
  478         crp->crp_buf = (caddr_t) m;
  479         crp->crp_callback = ipcomp_output_cb;
  480         crp->crp_opaque = (caddr_t) tc;
  481         crp->crp_sid = sav->tdb_cryptoid;
  482 
  483         return crypto_dispatch(crp);
  484 bad:
  485         if (m)
  486                 m_freem(m);
  487         return (error);
  488 }
  489 
  490 /*
  491  * IPComp output callback from the crypto driver.
  492  */
  493 static int
  494 ipcomp_output_cb(struct cryptop *crp)
  495 {
  496         struct tdb_crypto *tc;
  497         struct ipsecrequest *isr;
  498         struct secasvar *sav;
  499         struct mbuf *m;
  500         int error, skip, rlen;
  501 
  502         NET_LOCK_GIANT();
  503 
  504         tc = (struct tdb_crypto *) crp->crp_opaque;
  505         IPSEC_ASSERT(tc != NULL, ("null opaque data area!"));
  506         m = (struct mbuf *) crp->crp_buf;
  507         skip = tc->tc_skip;
  508         rlen = crp->crp_ilen - skip;
  509 
  510         isr = tc->tc_isr;
  511         IPSECREQUEST_LOCK(isr);
  512         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
  513         if (sav == NULL) {
  514                 ipcompstat.ipcomps_notdb++;
  515                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
  516                 error = ENOBUFS;                /*XXX*/
  517                 goto bad;
  518         }
  519         IPSEC_ASSERT(isr->sav == sav, ("SA changed\n"));
  520 
  521         /* Check for crypto errors */
  522         if (crp->crp_etype) {
  523                 /* Reset session ID */
  524                 if (sav->tdb_cryptoid != 0)
  525                         sav->tdb_cryptoid = crp->crp_sid;
  526 
  527                 if (crp->crp_etype == EAGAIN) {
  528                         KEY_FREESAV(&sav);
  529                         IPSECREQUEST_UNLOCK(isr);
  530                         error = crypto_dispatch(crp);
  531                         NET_UNLOCK_GIANT();
  532                         return error;
  533                 }
  534                 ipcompstat.ipcomps_noxform++;
  535                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  536                 error = crp->crp_etype;
  537                 goto bad;
  538         }
  539         /* Shouldn't happen... */
  540         if (m == NULL) {
  541                 ipcompstat.ipcomps_crypto++;
  542                 DPRINTF(("%s: bogus return buffer from crypto\n", __func__));
  543                 error = EINVAL;
  544                 goto bad;
  545         }
  546         ipcompstat.ipcomps_hist[sav->alg_comp]++;
  547 
  548         if (rlen > crp->crp_olen) {
  549                 /* Adjust the length in the IP header */
  550                 switch (sav->sah->saidx.dst.sa.sa_family) {
  551 #ifdef INET
  552                 case AF_INET:
  553                         mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
  554                         break;
  555 #endif /* INET */
  556 #ifdef INET6
  557                 case AF_INET6:
  558                         mtod(m, struct ip6_hdr *)->ip6_plen =
  559                                 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
  560                         break;
  561 #endif /* INET6 */
  562                 default:
  563                         ipcompstat.ipcomps_nopf++;
  564                         DPRINTF(("%s: unknown/unsupported protocol "
  565                             "family %d, IPCA %s/%08lx\n", __func__,
  566                             sav->sah->saidx.dst.sa.sa_family,
  567                             ipsec_address(&sav->sah->saidx.dst), 
  568                             (u_long) ntohl(sav->spi)));
  569                         error = EPFNOSUPPORT;
  570                         goto bad;
  571                 }
  572         } else {
  573                 /* compression was useless, we have lost time */
  574                 /* XXX add statistic */
  575         }
  576 
  577         /* Release the crypto descriptor */
  578         free(tc, M_XDATA);
  579         crypto_freereq(crp);
  580 
  581         /* NB: m is reclaimed by ipsec_process_done. */
  582         error = ipsec_process_done(m, isr);
  583         KEY_FREESAV(&sav);
  584         IPSECREQUEST_UNLOCK(isr);
  585         NET_UNLOCK_GIANT();
  586         return error;
  587 bad:
  588         if (sav)
  589                 KEY_FREESAV(&sav);
  590         IPSECREQUEST_UNLOCK(isr);
  591         if (m)
  592                 m_freem(m);
  593         free(tc, M_XDATA);
  594         crypto_freereq(crp);
  595         NET_UNLOCK_GIANT();
  596         return error;
  597 }
  598 
  599 static struct xformsw ipcomp_xformsw = {
  600         XF_IPCOMP,              XFT_COMP,               "IPcomp",
  601         ipcomp_init,            ipcomp_zeroize,         ipcomp_input,
  602         ipcomp_output
  603 };
  604 
  605 static void
  606 ipcomp_attach(void)
  607 {
  608         xform_register(&ipcomp_xformsw);
  609 }
  610 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL);

Cache object: d47c64b5f9c6489907931dbb9e220a75


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.