ipcomp_input.c

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    1 /*      $NetBSD: ipcomp_input.c,v 1.22.2.1 2007/12/01 17:29:55 bouyer Exp $     */
    2 /*      $KAME: ipcomp_input.c,v 1.29 2001/09/04 08:43:19 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 <sys/cdefs.h>
   38 __KERNEL_RCSID(0, "$NetBSD: ipcomp_input.c,v 1.22.2.1 2007/12/01 17:29:55 bouyer Exp $");
   39 
   40 #include "opt_inet.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/malloc.h>
   45 #include <sys/mbuf.h>
   46 #include <sys/domain.h>
   47 #include <sys/protosw.h>
   48 #include <sys/socket.h>
   49 #include <sys/errno.h>
   50 #include <sys/time.h>
   51 #include <sys/kernel.h>
   52 #include <sys/syslog.h>
   53 
   54 #include <net/if.h>
   55 #include <net/route.h>
   56 #include <net/netisr.h>
   57 #include <net/zlib.h>
   58 #include <machine/cpu.h>
   59 
   60 #include <netinet/in.h>
   61 #include <netinet/in_systm.h>
   62 #include <netinet/in_var.h>
   63 #include <netinet/ip.h>
   64 #include <netinet/ip_var.h>
   65 #include <netinet/ip_ecn.h>
   66 
   67 #ifdef INET6
   68 #include <netinet/ip6.h>
   69 #include <netinet6/ip6_var.h>
   70 #endif
   71 #include <netinet6/ipcomp.h>
   72 
   73 #include <netinet6/ipsec.h>
   74 #include <netkey/key.h>
   75 #include <netkey/keydb.h>
   76 
   77 #include <machine/stdarg.h>
   78 
   79 #include <net/net_osdep.h>
   80 
   81 /*#define IPLEN_FLIPPED*/
   82 
   83 #ifdef INET
   84 void
   85 #if __STDC__
   86 ipcomp4_input(struct mbuf *m, ...)
   87 #else
   88 ipcomp4_input(m, va_alist)
   89         struct mbuf *m;
   90         va_dcl
   91 #endif
   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 off, proto;
  104         va_list ap;
  105 
  106         va_start(ap, m);
  107         off = va_arg(ap, int);
  108         proto = va_arg(ap, int);
  109         va_end(ap);
  110 
  111         if (m->m_pkthdr.len < off + sizeof(struct ipcomp)) {
  112                 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
  113                     "(packet too short)\n"));
  114                 ipsecstat.in_inval++;
  115                 goto fail;
  116         }
  117 
  118         md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
  119         if (!md) {
  120                 m = NULL;       /* already freed */
  121                 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
  122                     "(pulldown failure)\n"));
  123                 ipsecstat.in_inval++;
  124                 goto fail;
  125         }
  126         ipcomp = mtod(md, struct ipcomp *);
  127         ip = mtod(m, struct ip *);
  128         nxt = ipcomp->comp_nxt;
  129 #ifdef _IP_VHL
  130         hlen = IP_VHL_HL(ip->ip_vhl) << 2;
  131 #else
  132         hlen = ip->ip_hl << 2;
  133 #endif
  134 
  135         cpi = ntohs(ipcomp->comp_cpi);
  136 
  137         if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
  138                 sav = key_allocsa(AF_INET, (caddr_t)&ip->ip_src,
  139                         (caddr_t)&ip->ip_dst, IPPROTO_IPCOMP, htonl(cpi));
  140                 if (sav != NULL &&
  141                     (sav->state == SADB_SASTATE_MATURE ||
  142                      sav->state == SADB_SASTATE_DYING)) {
  143                         cpi = sav->alg_enc;     /* XXX */
  144                         /* other parameters to look at? */
  145                 }
  146         }
  147         algo = ipcomp_algorithm_lookup(cpi);
  148         if (!algo) {
  149                 ipseclog((LOG_WARNING, "IPv4 IPComp input: unknown cpi %u\n",
  150                         cpi));
  151                 ipsecstat.in_nosa++;
  152                 goto fail;
  153         }
  154 
  155         /* chop ipcomp header */
  156         ipcomp = NULL;
  157         md->m_data += sizeof(struct ipcomp);
  158         md->m_len -= sizeof(struct ipcomp);
  159         m->m_pkthdr.len -= sizeof(struct ipcomp);
  160 #ifdef IPLEN_FLIPPED
  161         ip->ip_len -= sizeof(struct ipcomp);
  162 #else
  163         ip->ip_len = htons(ntohs(ip->ip_len) - sizeof(struct ipcomp));
  164 #endif
  165 
  166         olen = m->m_pkthdr.len;
  167         newlen = m->m_pkthdr.len - off;
  168         error = (*algo->decompress)(m, m->m_next, &newlen);
  169         if (error != 0) {
  170                 if (error == EINVAL)
  171                         ipsecstat.in_inval++;
  172                 else if (error == ENOBUFS)
  173                         ipsecstat.in_nomem++;
  174                 m = NULL;
  175                 goto fail;
  176         }
  177         ipsecstat.in_comphist[cpi]++;
  178 
  179         /*
  180          * returning decompressed packet onto icmp is meaningless.
  181          * mark it decrypted to prevent icmp from attaching original packet.
  182          */
  183         m->m_flags |= M_DECRYPTED;
  184 
  185         m->m_pkthdr.len = off + newlen;
  186         ip = mtod(m, struct ip *);
  187     {
  188         size_t len;
  189 #ifdef IPLEN_FLIPPED
  190         len = ip->ip_len;
  191 #else
  192         len = ntohs(ip->ip_len);
  193 #endif
  194         /*
  195          * be careful about underflow.  also, do not assign exact value
  196          * as ip_len is manipulated differently on *BSDs.
  197          */
  198         len += m->m_pkthdr.len;
  199         len -= olen;
  200         if (len & ~0xffff) {
  201                 /* packet too big after decompress */
  202                 ipsecstat.in_inval++;
  203                 goto fail;
  204         }
  205 #ifdef IPLEN_FLIPPED
  206         ip->ip_len = len & 0xffff;
  207 #else
  208         ip->ip_len = htons(len & 0xffff);
  209 #endif
  210         ip->ip_p = nxt;
  211     }
  212 
  213         if (sav) {
  214                 key_sa_recordxfer(sav, m);
  215                 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
  216                         ipsecstat.in_nomem++;
  217                         goto fail;
  218                 }
  219                 key_freesav(sav);
  220                 sav = NULL;
  221         }
  222 
  223         if (nxt != IPPROTO_DONE) {
  224                 if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
  225                     ipsec4_in_reject(m, NULL)) {
  226                         ipsecstat.in_polvio++;
  227                         goto fail;
  228                 }
  229                 (*inetsw[ip_protox[nxt]].pr_input)(m, off, nxt);
  230         } else
  231                 m_freem(m);
  232         m = NULL;
  233 
  234         ipsecstat.in_success++;
  235         return;
  236 
  237 fail:
  238         if (sav)
  239                 key_freesav(sav);
  240         if (m)
  241                 m_freem(m);
  242         return;
  243 }
  244 #endif /* INET */
  245 
  246 #ifdef INET6
  247 int
  248 ipcomp6_input(mp, offp, proto)
  249         struct mbuf **mp;
  250         int *offp, proto;
  251 {
  252         struct mbuf *m, *md;
  253         int off;
  254         struct ip6_hdr *ip6;
  255         struct ipcomp *ipcomp;
  256         const struct ipcomp_algorithm *algo;
  257         u_int16_t cpi;  /* host order */
  258         u_int16_t nxt;
  259         int error;
  260         size_t newlen;
  261         struct secasvar *sav = NULL;
  262         u_int8_t *prvnxtp;
  263 
  264         m = *mp;
  265         off = *offp;
  266 
  267         md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
  268         if (!md) {
  269                 m = NULL;       /* already freed */
  270                 ipseclog((LOG_DEBUG, "IPv6 IPComp input: assumption failed "
  271                     "(pulldown failure)\n"));
  272                 ipsec6stat.in_inval++;
  273                 goto fail;
  274         }
  275         ipcomp = mtod(md, struct ipcomp *);
  276         ip6 = mtod(m, struct ip6_hdr *);
  277         nxt = ipcomp->comp_nxt;
  278 
  279         cpi = ntohs(ipcomp->comp_cpi);
  280 
  281         if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
  282                 sav = key_allocsa(AF_INET6, (caddr_t)&ip6->ip6_src,
  283                         (caddr_t)&ip6->ip6_dst, IPPROTO_IPCOMP, htonl(cpi));
  284                 if (sav != NULL &&
  285                     (sav->state == SADB_SASTATE_MATURE ||
  286                      sav->state == SADB_SASTATE_DYING)) {
  287                         cpi = sav->alg_enc;     /* XXX */
  288                         /* other parameters to look at? */
  289                 }
  290         }
  291         algo = ipcomp_algorithm_lookup(cpi);
  292         if (!algo) {
  293                 ipseclog((LOG_WARNING, "IPv6 IPComp input: unknown cpi %u; "
  294                         "dropping the packet for simplicity\n", cpi));
  295                 ipsec6stat.in_nosa++;
  296                 goto fail;
  297         }
  298 
  299         /* chop ipcomp header */
  300         ipcomp = NULL;
  301         md->m_data += sizeof(struct ipcomp);
  302         md->m_len -= sizeof(struct ipcomp);
  303         m->m_pkthdr.len -= sizeof(struct ipcomp);
  304 
  305         newlen = m->m_pkthdr.len - off;
  306         error = (*algo->decompress)(m, md, &newlen);
  307         if (error != 0) {
  308                 if (error == EINVAL)
  309                         ipsec6stat.in_inval++;
  310                 else if (error == ENOBUFS)
  311                         ipsec6stat.in_nomem++;
  312                 m = NULL;
  313                 goto fail;
  314         }
  315         ipsec6stat.in_comphist[cpi]++;
  316         m->m_pkthdr.len = off + newlen;
  317 
  318         /*
  319          * returning decompressed packet onto icmp is meaningless.
  320          * mark it decrypted to prevent icmp from attaching original packet.
  321          */
  322         m->m_flags |= M_DECRYPTED;
  323 
  324         /* update next header field */
  325         prvnxtp = ip6_get_prevhdr(m, off);
  326         *prvnxtp = nxt;
  327 
  328         /*
  329          * no need to adjust payload length, as all the IPv6 protocols
  330          * look at m->m_pkthdr.len
  331          */
  332 
  333         if (sav) {
  334                 key_sa_recordxfer(sav, m);
  335                 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
  336                         ipsec6stat.in_nomem++;
  337                         goto fail;
  338                 }
  339                 key_freesav(sav);
  340                 sav = NULL;
  341         }
  342         *offp = off;
  343         *mp = m;
  344         ipsec6stat.in_success++;
  345         return nxt;
  346 
  347 fail:
  348         if (m)
  349                 m_freem(m);
  350         if (sav)
  351                 key_freesav(sav);
  352         return IPPROTO_DONE;
  353 }
  354 #endif /* INET6 */
Cache object: 863dec05e33052b2eaf4de61e82a4752
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FreeBSD/Linux Kernel Cross Reference sys/netinet6/ipcomp_input.c

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