ipcomp_input.c

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    1 /*      $FreeBSD: src/sys/netinet6/ipcomp_input.c,v 1.1.2.3 2002/04/28 05:40:27 suz Exp $       */
    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 <netproto/key/key.h>
   77 #include <netproto/key/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 int
   89 ipcomp4_input(struct mbuf **mp, int *offp, int proto)
   90 {
   91         int off;
   92         struct mbuf *md;
   93         struct mbuf *m;
   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         int error;
  100         size_t newlen, olen;
  101         struct secasvar *sav = NULL;
  102 
  103         off = *offp;
  104         m = *mp;
  105         *mp = NULL;
  106 
  107         if (m->m_pkthdr.len < off + sizeof(struct ipcomp)) {
  108                 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
  109                     "(packet too short)\n"));
  110                 ipsecstat.in_inval++;
  111                 goto fail;
  112         }
  113 
  114         md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
  115         if (!md) {
  116                 m = NULL;       /* already freed */
  117                 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
  118                     "(pulldown failure)\n"));
  119                 ipsecstat.in_inval++;
  120                 goto fail;
  121         }
  122         ipcomp = mtod(md, struct ipcomp *);
  123         ip = mtod(m, struct ip *);
  124         nxt = ipcomp->comp_nxt;
  125 
  126         cpi = ntohs(ipcomp->comp_cpi);
  127 
  128         if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
  129                 sav = key_allocsa(AF_INET, (caddr_t)&ip->ip_src,
  130                         (caddr_t)&ip->ip_dst, IPPROTO_IPCOMP, htonl(cpi));
  131                 if (sav != NULL
  132                  && (sav->state == SADB_SASTATE_MATURE
  133                   || sav->state == SADB_SASTATE_DYING)) {
  134                         cpi = sav->alg_enc;     /* XXX */
  135                         /* other parameters to look at? */
  136                 }
  137         }
  138         algo = ipcomp_algorithm_lookup(cpi);
  139         if (!algo) {
  140                 ipseclog((LOG_WARNING, "IPv4 IPComp input: unknown cpi %u\n",
  141                         cpi));
  142                 ipsecstat.in_nosa++;
  143                 goto fail;
  144         }
  145 
  146         /* chop ipcomp header */
  147         ipcomp = NULL;
  148         md->m_data += sizeof(struct ipcomp);
  149         md->m_len -= sizeof(struct ipcomp);
  150         m->m_pkthdr.len -= sizeof(struct ipcomp);
  151 #ifdef IPLEN_FLIPPED
  152         ip->ip_len -= sizeof(struct ipcomp);
  153 #else
  154         ip->ip_len = htons(ntohs(ip->ip_len) - sizeof(struct ipcomp));
  155 #endif
  156 
  157         olen = m->m_pkthdr.len;
  158         newlen = m->m_pkthdr.len - off;
  159         error = (*algo->decompress)(m, m->m_next, &newlen);
  160         if (error != 0) {
  161                 if (error == EINVAL)
  162                         ipsecstat.in_inval++;
  163                 else if (error == ENOBUFS)
  164                         ipsecstat.in_nomem++;
  165                 m = NULL;
  166                 goto fail;
  167         }
  168         ipsecstat.in_comphist[cpi]++;
  169 
  170         /*
  171          * returning decompressed packet onto icmp is meaningless.
  172          * mark it decrypted to prevent icmp from attaching original packet.
  173          */
  174         m->m_flags |= M_DECRYPTED;
  175 
  176         m->m_pkthdr.len = off + newlen;
  177         ip = mtod(m, struct ip *);
  178     {
  179         size_t len;
  180 #ifdef IPLEN_FLIPPED
  181         len = ip->ip_len;
  182 #else
  183         len = ntohs(ip->ip_len);
  184 #endif
  185         /*
  186          * be careful about underflow.  also, do not assign exact value
  187          * as ip_len is manipulated differently on *BSDs.
  188          */
  189         len += m->m_pkthdr.len;
  190         len -= olen;
  191         if (len & ~0xffff) {
  192                 /* packet too big after decompress */
  193                 ipsecstat.in_inval++;
  194                 goto fail;
  195         }
  196 #ifdef IPLEN_FLIPPED
  197         ip->ip_len = len & 0xffff;
  198 #else
  199         ip->ip_len = htons(len & 0xffff);
  200 #endif
  201         ip->ip_p = nxt;
  202     }
  203 
  204         if (sav) {
  205                 key_sa_recordxfer(sav, m);
  206                 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
  207                         ipsecstat.in_nomem++;
  208                         goto fail;
  209                 }
  210                 key_freesav(sav);
  211                 sav = NULL;
  212         }
  213 
  214         if (nxt != IPPROTO_DONE) {
  215                 if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) &&
  216                     ipsec4_in_reject(m, NULL)) {
  217                         ipsecstat.in_polvio++;
  218                         goto fail;
  219                 }
  220                 *mp = m;
  221                 *offp = off;
  222                 (*inetsw[ip_protox[nxt]].pr_input)(mp, offp, nxt);
  223         } else {
  224                 m_freem(m);
  225         }
  226         m = NULL;
  227 
  228         ipsecstat.in_success++;
  229         return(IPPROTO_DONE);
  230 
  231 fail:
  232         if (sav)
  233                 key_freesav(sav);
  234         if (m)
  235                 m_freem(m);
  236         return(IPPROTO_DONE);
  237 }
  238 #endif /* INET */
  239 
  240 #ifdef INET6
  241 int
  242 ipcomp6_input(struct mbuf **mp, int *offp, int proto)
  243 {
  244         struct mbuf *m, *md;
  245         int off;
  246         struct ip6_hdr *ip6;
  247         struct ipcomp *ipcomp;
  248         const struct ipcomp_algorithm *algo;
  249         u_int16_t cpi;  /* host order */
  250         u_int16_t nxt;
  251         int error;
  252         size_t newlen;
  253         struct secasvar *sav = NULL;
  254         char *prvnxtp;
  255 
  256         m = *mp;
  257         off = *offp;
  258 
  259         md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
  260         if (!md) {
  261                 m = NULL;       /* already freed */
  262                 ipseclog((LOG_DEBUG, "IPv6 IPComp input: assumption failed "
  263                     "(pulldown failure)\n"));
  264                 ipsec6stat.in_inval++;
  265                 goto fail;
  266         }
  267         ipcomp = mtod(md, struct ipcomp *);
  268         ip6 = mtod(m, struct ip6_hdr *);
  269         nxt = ipcomp->comp_nxt;
  270 
  271         cpi = ntohs(ipcomp->comp_cpi);
  272 
  273         if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
  274                 sav = key_allocsa(AF_INET6, (caddr_t)&ip6->ip6_src,
  275                         (caddr_t)&ip6->ip6_dst, IPPROTO_IPCOMP, htonl(cpi));
  276                 if (sav != NULL
  277                  && (sav->state == SADB_SASTATE_MATURE
  278                   || sav->state == SADB_SASTATE_DYING)) {
  279                         cpi = sav->alg_enc;     /* XXX */
  280                         /* other parameters to look at? */
  281                 }
  282         }
  283         algo = ipcomp_algorithm_lookup(cpi);
  284         if (!algo) {
  285                 ipseclog((LOG_WARNING, "IPv6 IPComp input: unknown cpi %u; "
  286                         "dropping the packet for simplicity\n", cpi));
  287                 ipsec6stat.in_nosa++;
  288                 goto fail;
  289         }
  290 
  291         /* chop ipcomp header */
  292         ipcomp = NULL;
  293         md->m_data += sizeof(struct ipcomp);
  294         md->m_len -= sizeof(struct ipcomp);
  295         m->m_pkthdr.len -= sizeof(struct ipcomp);
  296 
  297         newlen = m->m_pkthdr.len - off;
  298         error = (*algo->decompress)(m, md, &newlen);
  299         if (error != 0) {
  300                 if (error == EINVAL)
  301                         ipsec6stat.in_inval++;
  302                 else if (error == ENOBUFS)
  303                         ipsec6stat.in_nomem++;
  304                 m = NULL;
  305                 goto fail;
  306         }
  307         ipsec6stat.in_comphist[cpi]++;
  308         m->m_pkthdr.len = off + newlen;
  309 
  310         /*
  311          * returning decompressed packet onto icmp is meaningless.
  312          * mark it decrypted to prevent icmp from attaching original packet.
  313          */
  314         m->m_flags |= M_DECRYPTED;
  315 
  316         /* update next header field */
  317         prvnxtp = ip6_get_prevhdr(m, off);
  318         *prvnxtp = nxt;
  319 
  320         /*
  321          * no need to adjust payload length, as all the IPv6 protocols
  322          * look at m->m_pkthdr.len
  323          */
  324 
  325         if (sav) {
  326                 key_sa_recordxfer(sav, m);
  327                 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
  328                         ipsec6stat.in_nomem++;
  329                         goto fail;
  330                 }
  331                 key_freesav(sav);
  332                 sav = NULL;
  333         }
  334         *offp = off;
  335         *mp = m;
  336         ipsec6stat.in_success++;
  337         return nxt;
  338 
  339 fail:
  340         if (m)
  341                 m_freem(m);
  342         if (sav)
  343                 key_freesav(sav);
  344         return IPPROTO_DONE;
  345 }
  346 #endif /* INET6 */
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FreeBSD/Linux Kernel Cross Reference sys/netinet6/ipcomp_input.c

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