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


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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/ipcomp_input.c

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    1 /*      $FreeBSD: releng/5.1/sys/netinet6/ipcomp_input.c 95023 2002-04-19 04:46:24Z suz $       */
    2 /*      $KAME: ipcomp_input.c,v 1.25 2001/03/01 09:12:09 itojun Exp $   */
    3 
    4 /*
    5  * Copyright (C) 1999 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   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. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 /*
   34  * RFC2393 IP payload compression protocol (IPComp).
   35  */
   36 
   37 #include "opt_inet.h"
   38 #include "opt_inet6.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/mbuf.h>
   43 #include <sys/domain.h>
   44 #include <sys/protosw.h>
   45 #include <sys/socket.h>
   46 #include <sys/errno.h>
   47 #include <sys/time.h>
   48 #include <sys/syslog.h>
   49 
   50 #include <net/if.h>
   51 #include <net/route.h>
   52 #include <net/netisr.h>
   53 #include <net/zlib.h>
   54 #include <machine/cpu.h>
   55 
   56 #include <netinet/in.h>
   57 #include <netinet/in_systm.h>
   58 #include <netinet/in_var.h>
   59 #include <netinet/ip.h>
   60 #include <netinet/ip_var.h>
   61 #include <netinet/ip_ecn.h>
   62 
   63 #ifdef INET6
   64 #include <netinet/ip6.h>
   65 #include <netinet6/ip6_var.h>
   66 #endif
   67 #include <netinet6/ipcomp.h>
   68 #ifdef INET6
   69 #include <netinet6/ipcomp6.h>
   70 #endif
   71 
   72 #include <netinet6/ipsec.h>
   73 #ifdef INET6
   74 #include <netinet6/ipsec6.h>
   75 #endif
   76 #include <netkey/key.h>
   77 #include <netkey/keydb.h>
   78 
   79 #include <machine/stdarg.h>
   80 
   81 #include <net/net_osdep.h>
   82 
   83 #define IPLEN_FLIPPED
   84 
   85 #ifdef INET
   86 extern struct protosw inetsw[];
   87 
   88 void
   89 ipcomp4_input(m, off)
   90         struct mbuf *m;
   91         int off;
   92 {
   93         struct mbuf *md;
   94         struct ip *ip;
   95         struct ipcomp *ipcomp;
   96         const struct ipcomp_algorithm *algo;
   97         u_int16_t cpi;  /* host order */
   98         u_int16_t nxt;
   99         size_t hlen;
  100         int error;
  101         size_t newlen, olen;
  102         struct secasvar *sav = NULL;
  103         int proto;
  104 
  105         if (m->m_pkthdr.len < off + sizeof(struct ipcomp)) {
  106                 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
  107                     "(packet too short)\n"));
  108                 ipsecstat.in_inval++;
  109                 goto fail;
  110         }
  111 
  112         md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
  113         if (!m) {
  114                 m = NULL;       /* already freed */
  115                 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
  116                     "(pulldown failure)\n"));
  117                 ipsecstat.in_inval++;
  118                 goto fail;
  119         }
  120         ipcomp = mtod(md, struct ipcomp *);
  121         ip = mtod(m, struct ip *);
  122         proto = ip->ip_p;
  123         nxt = ipcomp->comp_nxt;
  124 #ifdef _IP_VHL
  125         hlen = IP_VHL_HL(ip->ip_vhl) << 2;
  126 #else
  127         hlen = ip->ip_hl << 2;
  128 #endif
  129 
  130         cpi = ntohs(ipcomp->comp_cpi);
  131 
  132         if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
  133                 sav = key_allocsa(AF_INET, (caddr_t)&ip->ip_src,
  134                         (caddr_t)&ip->ip_dst, IPPROTO_IPCOMP, htonl(cpi));
  135                 if (sav != NULL
  136                  && (sav->state == SADB_SASTATE_MATURE
  137                   || sav->state == SADB_SASTATE_DYING)) {
  138                         cpi = sav->alg_enc;     /* XXX */
  139                         /* other parameters to look at? */
  140                 }
  141         }
  142         algo = ipcomp_algorithm_lookup(cpi);
  143         if (!algo) {
  144                 ipseclog((LOG_WARNING, "IPv4 IPComp input: unknown cpi %u\n",
  145                         cpi));
  146                 ipsecstat.in_nosa++;
  147                 goto fail;
  148         }
  149 
  150         /* chop ipcomp header */
  151         ipcomp = NULL;
  152         md->m_data += sizeof(struct ipcomp);
  153         md->m_len -= sizeof(struct ipcomp);
  154         m->m_pkthdr.len -= sizeof(struct ipcomp);
  155 #ifdef IPLEN_FLIPPED
  156         ip->ip_len -= sizeof(struct ipcomp);
  157 #else
  158         ip->ip_len = htons(ntohs(ip->ip_len) - sizeof(struct ipcomp));
  159 #endif
  160 
  161         olen = m->m_pkthdr.len;
  162         newlen = m->m_pkthdr.len - off;
  163         error = (*algo->decompress)(m, m->m_next, &newlen);
  164         if (error != 0) {
  165                 if (error == EINVAL)
  166                         ipsecstat.in_inval++;
  167                 else if (error == ENOBUFS)
  168                         ipsecstat.in_nomem++;
  169                 m = NULL;
  170                 goto fail;
  171         }
  172         ipsecstat.in_comphist[cpi]++;
  173 
  174         /*
  175          * returning decompressed packet onto icmp is meaningless.
  176          * mark it decrypted to prevent icmp from attaching original packet.
  177          */
  178         m->m_flags |= M_DECRYPTED;
  179 
  180         m->m_pkthdr.len = off + newlen;
  181         ip = mtod(m, struct ip *);
  182     {
  183         size_t len;
  184 #ifdef IPLEN_FLIPPED
  185         len = ip->ip_len;
  186 #else
  187         len = ntohs(ip->ip_len);
  188 #endif
  189         /*
  190          * be careful about underflow.  also, do not assign exact value
  191          * as ip_len is manipulated differently on *BSDs.
  192          */
  193         len += m->m_pkthdr.len;
  194         len -= olen;
  195         if (len & ~0xffff) {
  196                 /* packet too big after decompress */
  197                 ipsecstat.in_inval++;
  198                 goto fail;
  199         }
  200 #ifdef IPLEN_FLIPPED
  201         ip->ip_len = len & 0xffff;
  202 #else
  203         ip->ip_len = htons(len & 0xffff);
  204 #endif
  205         ip->ip_p = nxt;
  206     }
  207 
  208         if (sav) {
  209                 key_sa_recordxfer(sav, m);
  210                 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
  211                         ipsecstat.in_nomem++;
  212                         goto fail;
  213                 }
  214                 key_freesav(sav);
  215                 sav = NULL;
  216         }
  217 
  218         if (nxt != IPPROTO_DONE) {
  219                 if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
  220                     ipsec4_in_reject(m, NULL)) {
  221                         ipsecstat.in_polvio++;
  222                         goto fail;
  223                 }
  224                 (*inetsw[ip_protox[nxt]].pr_input)(m, off);
  225         } else
  226                 m_freem(m);
  227         m = NULL;
  228 
  229         ipsecstat.in_success++;
  230         return;
  231 
  232 fail:
  233         if (sav)
  234                 key_freesav(sav);
  235         if (m)
  236                 m_freem(m);
  237         return;
  238 }
  239 #endif /* INET */
  240 
  241 #ifdef INET6
  242 int
  243 ipcomp6_input(mp, offp, proto)
  244         struct mbuf **mp;
  245         int *offp, proto;
  246 {
  247         struct mbuf *m, *md;
  248         int off;
  249         struct ip6_hdr *ip6;
  250         struct ipcomp *ipcomp;
  251         const struct ipcomp_algorithm *algo;
  252         u_int16_t cpi;  /* host order */
  253         u_int16_t nxt;
  254         int error;
  255         size_t newlen;
  256         struct secasvar *sav = NULL;
  257         char *prvnxtp;
  258 
  259         m = *mp;
  260         off = *offp;
  261 
  262         md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
  263         if (!m) {
  264                 m = NULL;       /* already freed */
  265                 ipseclog((LOG_DEBUG, "IPv6 IPComp input: assumption failed "
  266                     "(pulldown failure)\n"));
  267                 ipsec6stat.in_inval++;
  268                 goto fail;
  269         }
  270         ipcomp = mtod(md, struct ipcomp *);
  271         ip6 = mtod(m, struct ip6_hdr *);
  272         nxt = ipcomp->comp_nxt;
  273 
  274         cpi = ntohs(ipcomp->comp_cpi);
  275 
  276         if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
  277                 sav = key_allocsa(AF_INET6, (caddr_t)&ip6->ip6_src,
  278                         (caddr_t)&ip6->ip6_dst, IPPROTO_IPCOMP, htonl(cpi));
  279                 if (sav != NULL
  280                  && (sav->state == SADB_SASTATE_MATURE
  281                   || sav->state == SADB_SASTATE_DYING)) {
  282                         cpi = sav->alg_enc;     /* XXX */
  283                         /* other parameters to look at? */
  284                 }
  285         }
  286         algo = ipcomp_algorithm_lookup(cpi);
  287         if (!algo) {
  288                 ipseclog((LOG_WARNING, "IPv6 IPComp input: unknown cpi %u; "
  289                         "dropping the packet for simplicity\n", cpi));
  290                 ipsec6stat.in_nosa++;
  291                 goto fail;
  292         }
  293 
  294         /* chop ipcomp header */
  295         ipcomp = NULL;
  296         md->m_data += sizeof(struct ipcomp);
  297         md->m_len -= sizeof(struct ipcomp);
  298         m->m_pkthdr.len -= sizeof(struct ipcomp);
  299 
  300         newlen = m->m_pkthdr.len - off;
  301         error = (*algo->decompress)(m, md, &newlen);
  302         if (error != 0) {
  303                 if (error == EINVAL)
  304                         ipsec6stat.in_inval++;
  305                 else if (error == ENOBUFS)
  306                         ipsec6stat.in_nomem++;
  307                 m = NULL;
  308                 goto fail;
  309         }
  310         ipsec6stat.in_comphist[cpi]++;
  311         m->m_pkthdr.len = off + newlen;
  312 
  313         /*
  314          * returning decompressed packet onto icmp is meaningless.
  315          * mark it decrypted to prevent icmp from attaching original packet.
  316          */
  317         m->m_flags |= M_DECRYPTED;
  318 
  319         /* update next header field */
  320         prvnxtp = ip6_get_prevhdr(m, off);
  321         *prvnxtp = nxt;
  322 
  323         /*
  324          * no need to adjust payload length, as all the IPv6 protocols
  325          * look at m->m_pkthdr.len
  326          */
  327 
  328         if (sav) {
  329                 key_sa_recordxfer(sav, m);
  330                 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
  331                         ipsec6stat.in_nomem++;
  332                         goto fail;
  333                 }
  334                 key_freesav(sav);
  335                 sav = NULL;
  336         }
  337         *offp = off;
  338         *mp = m;
  339         ipsec6stat.in_success++;
  340         return nxt;
  341 
  342 fail:
  343         if (m)
  344                 m_freem(m);
  345         if (sav)
  346                 key_freesav(sav);
  347         return IPPROTO_DONE;
  348 }
  349 #endif /* INET6 */

Cache object: a190c0fc6366fff80974cd69d07108a5


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