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/6.1/sys/netinet6/ipcomp_input.c 158179 2006-04-30 16:44:43Z cvs2svn $  */
    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 
  104         if (m->m_pkthdr.len < off + sizeof(struct ipcomp)) {
  105                 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
  106                     "(packet too short)\n"));
  107                 ipsecstat.in_inval++;
  108                 goto fail;
  109         }
  110 
  111         md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
  112         if (!md) {
  113                 m = NULL;       /* already freed */
  114                 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
  115                     "(pulldown failure)\n"));
  116                 ipsecstat.in_inval++;
  117                 goto fail;
  118         }
  119         ipcomp = mtod(md, struct ipcomp *);
  120         ip = mtod(m, struct ip *);
  121         nxt = ipcomp->comp_nxt;
  122 #ifdef _IP_VHL
  123         hlen = IP_VHL_HL(ip->ip_vhl) << 2;
  124 #else
  125         hlen = ip->ip_hl << 2;
  126 #endif
  127 
  128         cpi = ntohs(ipcomp->comp_cpi);
  129 
  130         if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
  131                 sav = key_allocsa(AF_INET, (caddr_t)&ip->ip_src,
  132                         (caddr_t)&ip->ip_dst, IPPROTO_IPCOMP, htonl(cpi));
  133                 if (sav != NULL
  134                  && (sav->state == SADB_SASTATE_MATURE
  135                   || sav->state == SADB_SASTATE_DYING)) {
  136                         cpi = sav->alg_enc;     /* XXX */
  137                         /* other parameters to look at? */
  138                 }
  139         }
  140         algo = ipcomp_algorithm_lookup(cpi);
  141         if (!algo) {
  142                 ipseclog((LOG_WARNING, "IPv4 IPComp input: unknown cpi %u\n",
  143                         cpi));
  144                 ipsecstat.in_nosa++;
  145                 goto fail;
  146         }
  147 
  148         /* chop ipcomp header */
  149         ipcomp = NULL;
  150         md->m_data += sizeof(struct ipcomp);
  151         md->m_len -= sizeof(struct ipcomp);
  152         m->m_pkthdr.len -= sizeof(struct ipcomp);
  153 #ifdef IPLEN_FLIPPED
  154         ip->ip_len -= sizeof(struct ipcomp);
  155 #else
  156         ip->ip_len = htons(ntohs(ip->ip_len) - sizeof(struct ipcomp));
  157 #endif
  158 
  159         olen = m->m_pkthdr.len;
  160         newlen = m->m_pkthdr.len - off;
  161         error = (*algo->decompress)(m, m->m_next, &newlen);
  162         if (error != 0) {
  163                 if (error == EINVAL)
  164                         ipsecstat.in_inval++;
  165                 else if (error == ENOBUFS)
  166                         ipsecstat.in_nomem++;
  167                 m = NULL;
  168                 goto fail;
  169         }
  170         ipsecstat.in_comphist[cpi]++;
  171 
  172         /*
  173          * returning decompressed packet onto icmp is meaningless.
  174          * mark it decrypted to prevent icmp from attaching original packet.
  175          */
  176         m->m_flags |= M_DECRYPTED;
  177 
  178         m->m_pkthdr.len = off + newlen;
  179         ip = mtod(m, struct ip *);
  180     {
  181         size_t len;
  182 #ifdef IPLEN_FLIPPED
  183         len = ip->ip_len;
  184 #else
  185         len = ntohs(ip->ip_len);
  186 #endif
  187         /*
  188          * be careful about underflow.  also, do not assign exact value
  189          * as ip_len is manipulated differently on *BSDs.
  190          */
  191         len += m->m_pkthdr.len;
  192         len -= olen;
  193         if (len & ~0xffff) {
  194                 /* packet too big after decompress */
  195                 ipsecstat.in_inval++;
  196                 goto fail;
  197         }
  198 #ifdef IPLEN_FLIPPED
  199         ip->ip_len = len & 0xffff;
  200 #else
  201         ip->ip_len = htons(len & 0xffff);
  202 #endif
  203         ip->ip_p = nxt;
  204     }
  205 
  206         if (sav) {
  207                 key_sa_recordxfer(sav, m);
  208                 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
  209                         ipsecstat.in_nomem++;
  210                         goto fail;
  211                 }
  212                 key_freesav(sav);
  213                 sav = NULL;
  214         }
  215 
  216         if (nxt != IPPROTO_DONE) {
  217                 if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
  218                     ipsec4_in_reject(m, NULL)) {
  219                         ipsecstat.in_polvio++;
  220                         goto fail;
  221                 }
  222                 (*inetsw[ip_protox[nxt]].pr_input)(m, off);
  223         } else
  224                 m_freem(m);
  225         m = NULL;
  226 
  227         ipsecstat.in_success++;
  228         return;
  229 
  230 fail:
  231         if (sav)
  232                 key_freesav(sav);
  233         if (m)
  234                 m_freem(m);
  235         return;
  236 }
  237 #endif /* INET */
  238 
  239 #ifdef INET6
  240 int
  241 ipcomp6_input(mp, offp, proto)
  242         struct mbuf **mp;
  243         int *offp, proto;
  244 {
  245         struct mbuf *m, *md;
  246         int off;
  247         struct ip6_hdr *ip6;
  248         struct ipcomp *ipcomp;
  249         const struct ipcomp_algorithm *algo;
  250         u_int16_t cpi;  /* host order */
  251         u_int16_t nxt;
  252         int error;
  253         size_t newlen;
  254         struct secasvar *sav = NULL;
  255         u_int8_t *prvnxtp;
  256 
  257         m = *mp;
  258         off = *offp;
  259 
  260         md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
  261         if (!md) {
  262                 m = NULL;       /* already freed */
  263                 ipseclog((LOG_DEBUG, "IPv6 IPComp input: assumption failed "
  264                     "(pulldown failure)\n"));
  265                 ipsec6stat.in_inval++;
  266                 goto fail;
  267         }
  268         ipcomp = mtod(md, struct ipcomp *);
  269         ip6 = mtod(m, struct ip6_hdr *);
  270         nxt = ipcomp->comp_nxt;
  271 
  272         cpi = ntohs(ipcomp->comp_cpi);
  273 
  274         if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
  275                 sav = key_allocsa(AF_INET6, (caddr_t)&ip6->ip6_src,
  276                     (caddr_t)&ip6->ip6_dst, IPPROTO_IPCOMP, htonl(cpi));
  277                 if (sav != NULL
  278                  && (sav->state == SADB_SASTATE_MATURE
  279                   || sav->state == SADB_SASTATE_DYING)) {
  280                         cpi = sav->alg_enc;     /* XXX */
  281                         /* other parameters to look at? */
  282                 }
  283         }
  284         algo = ipcomp_algorithm_lookup(cpi);
  285         if (!algo) {
  286                 ipseclog((LOG_WARNING, "IPv6 IPComp input: unknown cpi %u; "
  287                         "dropping the packet for simplicity\n", cpi));
  288                 ipsec6stat.in_nosa++;
  289                 goto fail;
  290         }
  291 
  292         /* chop ipcomp header */
  293         ipcomp = NULL;
  294         md->m_data += sizeof(struct ipcomp);
  295         md->m_len -= sizeof(struct ipcomp);
  296         m->m_pkthdr.len -= sizeof(struct ipcomp);
  297 
  298         newlen = m->m_pkthdr.len - off;
  299         error = (*algo->decompress)(m, md, &newlen);
  300         if (error != 0) {
  301                 if (error == EINVAL)
  302                         ipsec6stat.in_inval++;
  303                 else if (error == ENOBUFS)
  304                         ipsec6stat.in_nomem++;
  305                 m = NULL;
  306                 goto fail;
  307         }
  308         ipsec6stat.in_comphist[cpi]++;
  309         m->m_pkthdr.len = off + newlen;
  310 
  311         /*
  312          * returning decompressed packet onto icmp is meaningless.
  313          * mark it decrypted to prevent icmp from attaching original packet.
  314          */
  315         m->m_flags |= M_DECRYPTED;
  316 
  317         /* update next header field */
  318         prvnxtp = ip6_get_prevhdr(m, off);
  319         *prvnxtp = nxt;
  320 
  321         /*
  322          * no need to adjust payload length, as all the IPv6 protocols
  323          * look at m->m_pkthdr.len
  324          */
  325 
  326         if (sav) {
  327                 key_sa_recordxfer(sav, m);
  328                 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
  329                         ipsec6stat.in_nomem++;
  330                         goto fail;
  331                 }
  332                 key_freesav(sav);
  333                 sav = NULL;
  334         }
  335         *offp = off;
  336         *mp = m;
  337         ipsec6stat.in_success++;
  338         return nxt;
  339 
  340 fail:
  341         if (m)
  342                 m_freem(m);
  343         if (sav)
  344                 key_freesav(sav);
  345         return IPPROTO_DONE;
  346 }
  347 #endif /* INET6 */

Cache object: 734634197be2576237bc167711ea0fbe


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