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

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    1 /*      $FreeBSD$       */
    2 /* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */
    3 
    4 /*-
    5  * SPDX-License-Identifier: BSD-3-Clause
    6  *
    7  * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  *
   13  * 1. Redistributions of source code must retain the above copyright
   14  *   notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *   notice, this list of conditions and the following disclaimer in the
   17  *   documentation and/or other materials provided with the distribution.
   18  * 3. The name of the author may not be used to endorse or promote products
   19  *   derived from this software without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 /* IP payload compression protocol (IPComp), see RFC 2393 */
   34 #include "opt_inet.h"
   35 #include "opt_inet6.h"
   36 #include "opt_ipsec.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/malloc.h>
   41 #include <sys/mbuf.h>
   42 #include <sys/lock.h>
   43 #include <sys/mutex.h>
   44 #include <sys/socket.h>
   45 #include <sys/kernel.h>
   46 #include <sys/protosw.h>
   47 #include <sys/sysctl.h>
   48 
   49 #include <netinet/in.h>
   50 #include <netinet/in_systm.h>
   51 #include <netinet/ip.h>
   52 #include <netinet/ip_var.h>
   53 #include <netinet/ip_encap.h>
   54 
   55 #include <net/netisr.h>
   56 #include <net/vnet.h>
   57 #include <net/if.h>     /* XXXGL: net_epoch should move out there */
   58 #include <net/if_var.h> /* XXXGL: net_epoch should move out there */
   59 
   60 #include <netipsec/ipsec.h>
   61 #include <netipsec/xform.h>
   62 
   63 #ifdef INET6
   64 #include <netinet/ip6.h>
   65 #include <netinet6/ip6_var.h>
   66 #include <netipsec/ipsec6.h>
   67 #endif
   68 
   69 #include <netipsec/ipcomp.h>
   70 #include <netipsec/ipcomp_var.h>
   71 
   72 #include <netipsec/key.h>
   73 #include <netipsec/key_debug.h>
   74 
   75 #include <opencrypto/cryptodev.h>
   76 #include <opencrypto/deflate.h>
   77 #include <opencrypto/xform.h>
   78 
   79 VNET_DEFINE(int, ipcomp_enable) = 1;
   80 VNET_PCPUSTAT_DEFINE(struct ipcompstat, ipcompstat);
   81 VNET_PCPUSTAT_SYSINIT(ipcompstat);
   82 
   83 #ifdef VIMAGE
   84 VNET_PCPUSTAT_SYSUNINIT(ipcompstat);
   85 #endif /* VIMAGE */
   86 
   87 SYSCTL_DECL(_net_inet_ipcomp);
   88 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, ipcomp_enable,
   89         CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, "");
   90 SYSCTL_VNET_PCPUSTAT(_net_inet_ipcomp, IPSECCTL_STATS, stats,
   91     struct ipcompstat, ipcompstat,
   92     "IPCOMP statistics (struct ipcompstat, netipsec/ipcomp_var.h");
   93 
   94 static MALLOC_DEFINE(M_IPCOMP, "ipcomp", "IPCOMP");
   95 
   96 static int ipcomp_input_cb(struct cryptop *crp);
   97 static int ipcomp_output_cb(struct cryptop *crp);
   98 
   99 /*
  100  * RFC 3173 p 2.2. Non-Expansion Policy:
  101  * If the total size of a compressed payload and the IPComp header, as
  102  * defined in section 3, is not smaller than the size of the original
  103  * payload, the IP datagram MUST be sent in the original non-compressed
  104  * form.
  105  *
  106  * When we use IPComp in tunnel mode, for small packets we will receive
  107  * encapsulated IP-IP datagrams without any compression and without IPComp
  108  * header.
  109  */
  110 static int
  111 ipcomp_encapcheck(union sockaddr_union *src, union sockaddr_union *dst)
  112 {
  113         struct secasvar *sav;
  114 
  115         sav = key_allocsa_tunnel(src, dst, IPPROTO_IPCOMP);
  116         if (sav == NULL)
  117                 return (0);
  118         key_freesav(&sav);
  119 
  120         if (src->sa.sa_family == AF_INET)
  121                 return (sizeof(struct in_addr) << 4);
  122         else
  123                 return (sizeof(struct in6_addr) << 4);
  124 }
  125 
  126 static int
  127 ipcomp_nonexp_input(struct mbuf *m, int off, int proto, void *arg __unused)
  128 {
  129         int isr;
  130 
  131         NET_EPOCH_ASSERT();
  132 
  133         switch (proto) {
  134 #ifdef INET
  135         case IPPROTO_IPV4:
  136                 isr = NETISR_IP;
  137                 break;
  138 #endif
  139 #ifdef INET6
  140         case IPPROTO_IPV6:
  141                 isr = NETISR_IPV6;
  142                 break;
  143 #endif
  144         default:
  145                 IPCOMPSTAT_INC(ipcomps_nopf);
  146                 m_freem(m);
  147                 return (IPPROTO_DONE);
  148         }
  149         m_adj(m, off);
  150         IPCOMPSTAT_ADD(ipcomps_ibytes, m->m_pkthdr.len);
  151         IPCOMPSTAT_INC(ipcomps_input);
  152         netisr_dispatch(isr, m);
  153         return (IPPROTO_DONE);
  154 }
  155 
  156 /*
  157  * ipcomp_init() is called when an CPI is being set up.
  158  */
  159 static int
  160 ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
  161 {
  162         const struct comp_algo *tcomp;
  163         struct crypto_session_params csp;
  164 
  165         /* NB: algorithm really comes in alg_enc and not alg_comp! */
  166         tcomp = comp_algorithm_lookup(sav->alg_enc);
  167         if (tcomp == NULL) {
  168                 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__,
  169                          sav->alg_comp));
  170                 return EINVAL;
  171         }
  172         sav->alg_comp = sav->alg_enc;           /* set for doing histogram */
  173         sav->tdb_xform = xsp;
  174         sav->tdb_compalgxform = tcomp;
  175 
  176         /* Initialize crypto session */
  177         memset(&csp, 0, sizeof(csp));
  178         csp.csp_mode = CSP_MODE_COMPRESS;
  179         csp.csp_cipher_alg = sav->tdb_compalgxform->type;
  180 
  181         return crypto_newsession(&sav->tdb_cryptoid, &csp, V_crypto_support);
  182 }
  183 
  184 /*
  185  * ipcomp_cleanup() used when IPCA is deleted
  186  */
  187 static void
  188 ipcomp_cleanup(struct secasvar *sav)
  189 {
  190 
  191         crypto_freesession(sav->tdb_cryptoid);
  192         sav->tdb_cryptoid = NULL;
  193 }
  194 
  195 /*
  196  * ipcomp_input() gets called to uncompress an input packet
  197  */
  198 static int
  199 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  200 {
  201         struct xform_data *xd;
  202         struct cryptop *crp;
  203         struct ipcomp *ipcomp;
  204         crypto_session_t cryptoid;
  205         caddr_t addr;
  206         int error, hlen = IPCOMP_HLENGTH;
  207 
  208         SECASVAR_RLOCK_TRACKER;
  209 
  210         /*
  211          * Check that the next header of the IPComp is not IPComp again, before
  212          * doing any real work.  Given it is not possible to do double
  213          * compression it means someone is playing tricks on us.
  214          */
  215         error = ENOBUFS;
  216         if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
  217                 IPCOMPSTAT_INC(ipcomps_hdrops);         /*XXX*/
  218                 DPRINTF(("%s: m_pullup failed\n", __func__));
  219                 key_freesav(&sav);
  220                 return (error);
  221         }
  222         addr = (caddr_t) mtod(m, struct ip *) + skip;
  223         ipcomp = (struct ipcomp *)addr;
  224         if (ipcomp->comp_nxt == IPPROTO_IPCOMP) {
  225                 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */
  226                 DPRINTF(("%s: recursive compression detected\n", __func__));
  227                 error = EINVAL;
  228                 goto bad;
  229         }
  230 
  231         SECASVAR_RLOCK(sav);
  232         cryptoid = sav->tdb_cryptoid;
  233         SECASVAR_RUNLOCK(sav);
  234 
  235         /* Get crypto descriptors */
  236         crp = crypto_getreq(cryptoid, M_NOWAIT);
  237         if (crp == NULL) {
  238                 DPRINTF(("%s: no crypto descriptors\n", __func__));
  239                 IPCOMPSTAT_INC(ipcomps_crypto);
  240                 goto bad;
  241         }
  242         /* Get IPsec-specific opaque pointer */
  243         xd = malloc(sizeof(*xd), M_IPCOMP, M_NOWAIT | M_ZERO);
  244         if (xd == NULL) {
  245                 DPRINTF(("%s: cannot allocate xform_data\n", __func__));
  246                 IPCOMPSTAT_INC(ipcomps_crypto);
  247                 crypto_freereq(crp);
  248                 goto bad;
  249         }
  250 
  251         /* Decompression operation */
  252         crp->crp_op = CRYPTO_OP_DECOMPRESS;
  253         crp->crp_payload_start = skip + hlen;
  254         crp->crp_payload_length = m->m_pkthdr.len - (skip + hlen);
  255 
  256         /* Crypto operation descriptor */
  257         crp->crp_flags = CRYPTO_F_CBIFSYNC;
  258         crypto_use_mbuf(crp, m);
  259         crp->crp_callback = ipcomp_input_cb;
  260         crp->crp_opaque = xd;
  261 
  262         /* These are passed as-is to the callback */
  263         xd->sav = sav;
  264         xd->protoff = protoff;
  265         xd->skip = skip;
  266         xd->vnet = curvnet;
  267         xd->cryptoid = cryptoid;
  268 
  269         SECASVAR_RLOCK(sav);
  270         crp->crp_session = xd->cryptoid = sav->tdb_cryptoid;
  271         SECASVAR_RUNLOCK(sav);
  272 
  273         return crypto_dispatch(crp);
  274 bad:
  275         m_freem(m);
  276         key_freesav(&sav);
  277         return (error);
  278 }
  279 
  280 /*
  281  * IPComp input callback from the crypto driver.
  282  */
  283 static int
  284 ipcomp_input_cb(struct cryptop *crp)
  285 {
  286         IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
  287         struct xform_data *xd;
  288         struct mbuf *m;
  289         struct secasvar *sav;
  290         struct secasindex *saidx;
  291         caddr_t addr;
  292         crypto_session_t cryptoid;
  293         int hlen = IPCOMP_HLENGTH, error, clen;
  294         int skip, protoff;
  295         uint8_t nproto;
  296 
  297         m = crp->crp_buf.cb_mbuf;
  298         xd = crp->crp_opaque;
  299         CURVNET_SET(xd->vnet);
  300         sav = xd->sav;
  301         skip = xd->skip;
  302         protoff = xd->protoff;
  303         cryptoid = xd->cryptoid;
  304         saidx = &sav->sah->saidx;
  305         IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
  306                 saidx->dst.sa.sa_family == AF_INET6,
  307                 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
  308 
  309         /* Check for crypto errors */
  310         if (crp->crp_etype) {
  311                 if (crp->crp_etype == EAGAIN) {
  312                         /* Reset the session ID */
  313                         if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0)
  314                                 crypto_freesession(cryptoid);
  315                         xd->cryptoid = crp->crp_session;
  316                         CURVNET_RESTORE();
  317                         return (crypto_dispatch(crp));
  318                 }
  319                 IPCOMPSTAT_INC(ipcomps_noxform);
  320                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  321                 error = crp->crp_etype;
  322                 goto bad;
  323         }
  324         /* Shouldn't happen... */
  325         if (m == NULL) {
  326                 IPCOMPSTAT_INC(ipcomps_crypto);
  327                 DPRINTF(("%s: null mbuf returned from crypto\n", __func__));
  328                 error = EINVAL;
  329                 goto bad;
  330         }
  331         IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
  332 
  333         clen = crp->crp_olen;           /* Length of data after processing */
  334 
  335         /* Release the crypto descriptors */
  336         free(xd, M_IPCOMP), xd = NULL;
  337         crypto_freereq(crp), crp = NULL;
  338 
  339         /* In case it's not done already, adjust the size of the mbuf chain */
  340         m->m_pkthdr.len = clen + hlen + skip;
  341 
  342         if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
  343                 IPCOMPSTAT_INC(ipcomps_hdrops);         /*XXX*/
  344                 DPRINTF(("%s: m_pullup failed\n", __func__));
  345                 error = EINVAL;                         /*XXX*/
  346                 goto bad;
  347         }
  348 
  349         /* Keep the next protocol field */
  350         addr = (caddr_t) mtod(m, struct ip *) + skip;
  351         nproto = ((struct ipcomp *) addr)->comp_nxt;
  352 
  353         /* Remove the IPCOMP header */
  354         error = m_striphdr(m, skip, hlen);
  355         if (error) {
  356                 IPCOMPSTAT_INC(ipcomps_hdrops);
  357                 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__,
  358                     ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
  359                     (u_long) ntohl(sav->spi)));
  360                 goto bad;
  361         }
  362 
  363         /* Restore the Next Protocol field */
  364         m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
  365 
  366         switch (saidx->dst.sa.sa_family) {
  367 #ifdef INET6
  368         case AF_INET6:
  369                 error = ipsec6_common_input_cb(m, sav, skip, protoff);
  370                 break;
  371 #endif
  372 #ifdef INET
  373         case AF_INET:
  374                 error = ipsec4_common_input_cb(m, sav, skip, protoff);
  375                 break;
  376 #endif
  377         default:
  378                 panic("%s: Unexpected address family: %d saidx=%p", __func__,
  379                     saidx->dst.sa.sa_family, saidx);
  380         }
  381         CURVNET_RESTORE();
  382         return error;
  383 bad:
  384         CURVNET_RESTORE();
  385         if (sav != NULL)
  386                 key_freesav(&sav);
  387         if (m != NULL)
  388                 m_freem(m);
  389         if (xd != NULL)
  390                 free(xd, M_IPCOMP);
  391         if (crp != NULL)
  392                 crypto_freereq(crp);
  393         return error;
  394 }
  395 
  396 /*
  397  * IPComp output routine, called by ipsec[46]_perform_request()
  398  */
  399 static int
  400 ipcomp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav,
  401     u_int idx, int skip, int protoff)
  402 {
  403         IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
  404         const struct comp_algo *ipcompx;
  405         struct cryptop *crp;
  406         struct xform_data *xd;
  407         crypto_session_t cryptoid;
  408         int error, ralen, maxpacketsize;
  409 
  410         SECASVAR_RLOCK_TRACKER;
  411 
  412         IPSEC_ASSERT(sav != NULL, ("null SA"));
  413         ipcompx = sav->tdb_compalgxform;
  414         IPSEC_ASSERT(ipcompx != NULL, ("null compression xform"));
  415 
  416         /*
  417          * Do not touch the packet in case our payload to compress
  418          * is lower than the minimal threshold of the compression
  419          * alogrithm.  We will just send out the data uncompressed.
  420          * See RFC 3173, 2.2. Non-Expansion Policy.
  421          */
  422         if (m->m_pkthdr.len <= ipcompx->minlen) {
  423                 IPCOMPSTAT_INC(ipcomps_threshold);
  424                 return ipsec_process_done(m, sp, sav, idx);
  425         }
  426 
  427         ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
  428         IPCOMPSTAT_INC(ipcomps_output);
  429 
  430         /* Check for maximum packet size violations. */
  431         switch (sav->sah->saidx.dst.sa.sa_family) {
  432 #ifdef INET
  433         case AF_INET:
  434                 maxpacketsize = IP_MAXPACKET;
  435                 break;
  436 #endif /* INET */
  437 #ifdef INET6
  438         case AF_INET6:
  439                 maxpacketsize = IPV6_MAXPACKET;
  440                 break;
  441 #endif /* INET6 */
  442         default:
  443                 IPCOMPSTAT_INC(ipcomps_nopf);
  444                 DPRINTF(("%s: unknown/unsupported protocol family %d, "
  445                     "IPCA %s/%08lx\n", __func__,
  446                     sav->sah->saidx.dst.sa.sa_family,
  447                     ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
  448                     (u_long) ntohl(sav->spi)));
  449                 error = EPFNOSUPPORT;
  450                 goto bad;
  451         }
  452         if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) {
  453                 IPCOMPSTAT_INC(ipcomps_toobig);
  454                 DPRINTF(("%s: packet in IPCA %s/%08lx got too big "
  455                     "(len %u, max len %u)\n", __func__,
  456                     ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
  457                     (u_long) ntohl(sav->spi),
  458                     ralen + skip + IPCOMP_HLENGTH, maxpacketsize));
  459                 error = EMSGSIZE;
  460                 goto bad;
  461         }
  462 
  463         /* Update the counters */
  464         IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip);
  465 
  466         m = m_unshare(m, M_NOWAIT);
  467         if (m == NULL) {
  468                 IPCOMPSTAT_INC(ipcomps_hdrops);
  469                 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n",
  470                     __func__, ipsec_address(&sav->sah->saidx.dst, buf,
  471                     sizeof(buf)), (u_long) ntohl(sav->spi)));
  472                 error = ENOBUFS;
  473                 goto bad;
  474         }
  475 
  476         /* Ok now, we can pass to the crypto processing. */
  477         SECASVAR_RLOCK(sav);
  478         cryptoid = sav->tdb_cryptoid;
  479         SECASVAR_RUNLOCK(sav);
  480 
  481         /* Get crypto descriptors */
  482         crp = crypto_getreq(cryptoid, M_NOWAIT);
  483         if (crp == NULL) {
  484                 IPCOMPSTAT_INC(ipcomps_crypto);
  485                 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
  486                 error = ENOBUFS;
  487                 goto bad;
  488         }
  489 
  490         /* Compression descriptor */
  491         crp->crp_op = CRYPTO_OP_COMPRESS;
  492         crp->crp_payload_start = skip;
  493         crp->crp_payload_length = ralen;
  494 
  495         /* IPsec-specific opaque crypto info */
  496         xd =  malloc(sizeof(struct xform_data), M_IPCOMP, M_NOWAIT | M_ZERO);
  497         if (xd == NULL) {
  498                 IPCOMPSTAT_INC(ipcomps_crypto);
  499                 DPRINTF(("%s: failed to allocate xform_data\n", __func__));
  500                 crypto_freereq(crp);
  501                 error = ENOBUFS;
  502                 goto bad;
  503         }
  504 
  505         xd->sp = sp;
  506         xd->sav = sav;
  507         xd->idx = idx;
  508         xd->skip = skip;
  509         xd->protoff = protoff;
  510         xd->vnet = curvnet;
  511         xd->cryptoid = cryptoid;
  512 
  513         /* Crypto operation descriptor */
  514         crp->crp_flags = CRYPTO_F_CBIFSYNC;
  515         crypto_use_mbuf(crp, m);
  516         crp->crp_callback = ipcomp_output_cb;
  517         crp->crp_opaque = xd;
  518 
  519         return crypto_dispatch(crp);
  520 bad:
  521         if (m)
  522                 m_freem(m);
  523         key_freesav(&sav);
  524         key_freesp(&sp);
  525         return (error);
  526 }
  527 
  528 /*
  529  * IPComp output callback from the crypto driver.
  530  */
  531 static int
  532 ipcomp_output_cb(struct cryptop *crp)
  533 {
  534         IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
  535         struct xform_data *xd;
  536         struct secpolicy *sp;
  537         struct secasvar *sav;
  538         struct mbuf *m;
  539         crypto_session_t cryptoid;
  540         u_int idx;
  541         int error, skip, protoff;
  542 
  543         m = crp->crp_buf.cb_mbuf;
  544         xd = crp->crp_opaque;
  545         CURVNET_SET(xd->vnet);
  546         idx = xd->idx;
  547         sp = xd->sp;
  548         sav = xd->sav;
  549         skip = xd->skip;
  550         protoff = xd->protoff;
  551         cryptoid = xd->cryptoid;
  552 
  553         /* Check for crypto errors */
  554         if (crp->crp_etype) {
  555                 if (crp->crp_etype == EAGAIN) {
  556                         /* Reset the session ID */
  557                         if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0)
  558                                 crypto_freesession(cryptoid);
  559                         xd->cryptoid = crp->crp_session;
  560                         CURVNET_RESTORE();
  561                         return (crypto_dispatch(crp));
  562                 }
  563                 IPCOMPSTAT_INC(ipcomps_noxform);
  564                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  565                 error = crp->crp_etype;
  566                 goto bad;
  567         }
  568         /* Shouldn't happen... */
  569         if (m == NULL) {
  570                 IPCOMPSTAT_INC(ipcomps_crypto);
  571                 DPRINTF(("%s: bogus return buffer from crypto\n", __func__));
  572                 error = EINVAL;
  573                 goto bad;
  574         }
  575         IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
  576 
  577         if (crp->crp_payload_length > crp->crp_olen) {
  578                 struct mbuf *mo;
  579                 struct ipcomp *ipcomp;
  580                 int roff;
  581                 uint8_t prot;
  582 
  583                 /* Compression helped, inject IPCOMP header. */
  584                 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
  585                 if (mo == NULL) {
  586                         IPCOMPSTAT_INC(ipcomps_wrap);
  587                         DPRINTF(("%s: IPCOMP header inject failed "
  588                             "for IPCA %s/%08lx\n",
  589                             __func__, ipsec_address(&sav->sah->saidx.dst, buf,
  590                             sizeof(buf)), (u_long) ntohl(sav->spi)));
  591                         error = ENOBUFS;
  592                         goto bad;
  593                 }
  594                 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
  595 
  596                 /* Initialize the IPCOMP header */
  597                 /* XXX alignment always correct? */
  598                 switch (sav->sah->saidx.dst.sa.sa_family) {
  599 #ifdef INET
  600                 case AF_INET:
  601                         ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
  602                         break;
  603 #endif /* INET */
  604 #ifdef INET6
  605                 case AF_INET6:
  606                         ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
  607                         break;
  608 #endif
  609                 }
  610                 ipcomp->comp_flags = 0;
  611                 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
  612 
  613                 /* Fix Next Protocol in IPv4/IPv6 header */
  614                 prot = IPPROTO_IPCOMP;
  615                 m_copyback(m, protoff, sizeof(u_int8_t),
  616                     (u_char *)&prot);
  617 
  618                 /* Adjust the length in the IP header */
  619                 switch (sav->sah->saidx.dst.sa.sa_family) {
  620 #ifdef INET
  621                 case AF_INET:
  622                         mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
  623                         break;
  624 #endif /* INET */
  625 #ifdef INET6
  626                 case AF_INET6:
  627                         mtod(m, struct ip6_hdr *)->ip6_plen =
  628                                 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
  629                         break;
  630 #endif /* INET6 */
  631                 default:
  632                         IPCOMPSTAT_INC(ipcomps_nopf);
  633                         DPRINTF(("%s: unknown/unsupported protocol "
  634                             "family %d, IPCA %s/%08lx\n", __func__,
  635                             sav->sah->saidx.dst.sa.sa_family,
  636                             ipsec_address(&sav->sah->saidx.dst, buf,
  637                                 sizeof(buf)), (u_long) ntohl(sav->spi)));
  638                         error = EPFNOSUPPORT;
  639                         goto bad;
  640                 }
  641         } else {
  642                 /* Compression was useless, we have lost time. */
  643                 IPCOMPSTAT_INC(ipcomps_uncompr);
  644                 DPRINTF(("%s: compressions was useless %d <= %d\n",
  645                     __func__, crp->crp_payload_length, crp->crp_olen));
  646                 /* XXX remember state to not compress the next couple
  647                  *     of packets, RFC 3173, 2.2. Non-Expansion Policy */
  648         }
  649 
  650         /* Release the crypto descriptor */
  651         free(xd, M_IPCOMP);
  652         crypto_freereq(crp);
  653 
  654         /* NB: m is reclaimed by ipsec_process_done. */
  655         error = ipsec_process_done(m, sp, sav, idx);
  656         CURVNET_RESTORE();
  657         return (error);
  658 bad:
  659         if (m)
  660                 m_freem(m);
  661         CURVNET_RESTORE();
  662         free(xd, M_IPCOMP);
  663         crypto_freereq(crp);
  664         key_freesav(&sav);
  665         key_freesp(&sp);
  666         return (error);
  667 }
  668 
  669 #ifdef INET
  670 static int
  671 ipcomp4_nonexp_encapcheck(const struct mbuf *m, int off, int proto,
  672     void *arg __unused)
  673 {
  674         union sockaddr_union src, dst;
  675         const struct ip *ip;
  676 
  677         if (V_ipcomp_enable == 0)
  678                 return (0);
  679         if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6)
  680                 return (0);
  681         bzero(&src, sizeof(src));
  682         bzero(&dst, sizeof(dst));
  683         src.sa.sa_family = dst.sa.sa_family = AF_INET;
  684         src.sin.sin_len = dst.sin.sin_len = sizeof(struct sockaddr_in);
  685         ip = mtod(m, const struct ip *);
  686         src.sin.sin_addr = ip->ip_src;
  687         dst.sin.sin_addr = ip->ip_dst;
  688         return (ipcomp_encapcheck(&src, &dst));
  689 }
  690 
  691 static const struct encaptab *ipe4_cookie = NULL;
  692 static const struct encap_config ipv4_encap_cfg = {
  693         .proto = -1,
  694         .min_length = sizeof(struct ip),
  695         .exact_match = sizeof(in_addr_t) << 4,
  696         .check = ipcomp4_nonexp_encapcheck,
  697         .input = ipcomp_nonexp_input
  698 };
  699 #endif
  700 #ifdef INET6
  701 static int
  702 ipcomp6_nonexp_encapcheck(const struct mbuf *m, int off, int proto,
  703     void *arg __unused)
  704 {
  705         union sockaddr_union src, dst;
  706         const struct ip6_hdr *ip6;
  707 
  708         if (V_ipcomp_enable == 0)
  709                 return (0);
  710         if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6)
  711                 return (0);
  712         bzero(&src, sizeof(src));
  713         bzero(&dst, sizeof(dst));
  714         src.sa.sa_family = dst.sa.sa_family = AF_INET;
  715         src.sin6.sin6_len = dst.sin6.sin6_len = sizeof(struct sockaddr_in6);
  716         ip6 = mtod(m, const struct ip6_hdr *);
  717         src.sin6.sin6_addr = ip6->ip6_src;
  718         dst.sin6.sin6_addr = ip6->ip6_dst;
  719         if (IN6_IS_SCOPE_LINKLOCAL(&src.sin6.sin6_addr)) {
  720                 /* XXX: sa6_recoverscope() */
  721                 src.sin6.sin6_scope_id =
  722                     ntohs(src.sin6.sin6_addr.s6_addr16[1]);
  723                 src.sin6.sin6_addr.s6_addr16[1] = 0;
  724         }
  725         if (IN6_IS_SCOPE_LINKLOCAL(&dst.sin6.sin6_addr)) {
  726                 /* XXX: sa6_recoverscope() */
  727                 dst.sin6.sin6_scope_id =
  728                     ntohs(dst.sin6.sin6_addr.s6_addr16[1]);
  729                 dst.sin6.sin6_addr.s6_addr16[1] = 0;
  730         }
  731         return (ipcomp_encapcheck(&src, &dst));
  732 }
  733 
  734 static const struct encaptab *ipe6_cookie = NULL;
  735 static const struct encap_config ipv6_encap_cfg = {
  736         .proto = -1,
  737         .min_length = sizeof(struct ip6_hdr),
  738         .exact_match = sizeof(struct in6_addr) << 4,
  739         .check = ipcomp6_nonexp_encapcheck,
  740         .input = ipcomp_nonexp_input
  741 };
  742 #endif
  743 
  744 static struct xformsw ipcomp_xformsw = {
  745         .xf_type =      XF_IPCOMP,
  746         .xf_name =      "IPcomp",
  747         .xf_init =      ipcomp_init,
  748         .xf_cleanup =   ipcomp_cleanup,
  749         .xf_input =     ipcomp_input,
  750         .xf_output =    ipcomp_output,
  751 };
  752 
  753 static void
  754 ipcomp_attach(void)
  755 {
  756 
  757 #ifdef INET
  758         ipe4_cookie = ip_encap_attach(&ipv4_encap_cfg, NULL, M_WAITOK);
  759 #endif
  760 #ifdef INET6
  761         ipe6_cookie = ip6_encap_attach(&ipv6_encap_cfg, NULL, M_WAITOK);
  762 #endif
  763         xform_attach(&ipcomp_xformsw);
  764 }
  765 
  766 static void
  767 ipcomp_detach(void)
  768 {
  769 
  770 #ifdef INET
  771         ip_encap_detach(ipe4_cookie);
  772 #endif
  773 #ifdef INET6
  774         ip6_encap_detach(ipe6_cookie);
  775 #endif
  776         xform_detach(&ipcomp_xformsw);
  777 }
  778 
  779 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
  780     ipcomp_attach, NULL);
  781 SYSUNINIT(ipcomp_xform_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
  782     ipcomp_detach, NULL);

Cache object: 5c8f0b31922258882dbc0dea5fc6f91f


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