ipcomp_input.c

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    1 /*      $NetBSD: ipcomp_input.c,v 1.22.14.3 2007/11/22 19:07:15 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 1.22.14.3 2007/11/22 19:07:15 bouyer Exp $");
   39 
   40 #include "opt_inet.h"
   41 #include "opt_ipsec.h"
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/malloc.h>
   46 #include <sys/mbuf.h>
   47 #include <sys/domain.h>
   48 #include <sys/protosw.h>
   49 #include <sys/socket.h>
   50 #include <sys/errno.h>
   51 #include <sys/time.h>
   52 #include <sys/kernel.h>
   53 #include <sys/syslog.h>
   54 
   55 #include <net/if.h>
   56 #include <net/route.h>
   57 #include <net/netisr.h>
   58 #include <net/zlib.h>
   59 #include <machine/cpu.h>
   60 
   61 #include <netinet/in.h>
   62 #include <netinet/in_systm.h>
   63 #include <netinet/in_var.h>
   64 #include <netinet/ip.h>
   65 #include <netinet/ip_var.h>
   66 #include <netinet/ip_ecn.h>
   67 
   68 #ifdef INET6
   69 #include <netinet/ip6.h>
   70 #include <netinet6/ip6_var.h>
   71 #endif
   72 #include <netinet6/ipcomp.h>
   73 
   74 #include <netinet6/ipsec.h>
   75 #include <netkey/key.h>
   76 #include <netkey/keydb.h>
   77 
   78 #include <machine/stdarg.h>
   79 
   80 #include <net/net_osdep.h>
   81 
   82 /*#define IPLEN_FLIPPED*/
   83 
   84 #ifdef INET
   85 void
   86 #if __STDC__
   87 ipcomp4_input(struct mbuf *m, ...)
   88 #else
   89 ipcomp4_input(m, va_alist)
   90         struct mbuf *m;
   91         va_dcl
   92 #endif
   93 {
   94         struct mbuf *md;
   95         struct ip *ip;
   96         struct ipcomp *ipcomp;
   97         const struct ipcomp_algorithm *algo;
   98         u_int16_t cpi;  /* host order */
   99         u_int16_t nxt;
  100         size_t hlen;
  101         int error;
  102         size_t newlen, olen;
  103         struct secasvar *sav = NULL;
  104         int off, proto;
  105         va_list ap;
  106 
  107         va_start(ap, m);
  108         off = va_arg(ap, int);
  109         proto = va_arg(ap, int);
  110         va_end(ap);
  111 
  112         if (m->m_pkthdr.len < off + sizeof(struct ipcomp)) {
  113                 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
  114                     "(packet too short)\n"));
  115                 ipsecstat.in_inval++;
  116                 goto fail;
  117         }
  118 
  119         md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
  120         if (!md) {
  121                 m = NULL;       /* already freed */
  122                 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
  123                     "(pulldown failure)\n"));
  124                 ipsecstat.in_inval++;
  125                 goto fail;
  126         }
  127         ipcomp = mtod(md, struct ipcomp *);
  128         ip = mtod(m, struct ip *);
  129         nxt = ipcomp->comp_nxt;
  130 #ifdef _IP_VHL
  131         hlen = IP_VHL_HL(ip->ip_vhl) << 2;
  132 #else
  133         hlen = ip->ip_hl << 2;
  134 #endif
  135 
  136         cpi = ntohs(ipcomp->comp_cpi);
  137 
  138         if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
  139                 sav = key_allocsa(AF_INET, (caddr_t)&ip->ip_src,
  140                         (caddr_t)&ip->ip_dst, IPPROTO_IPCOMP, htonl(cpi), 
  141                         0, 0);
  142                 if (sav != NULL &&
  143                     (sav->state == SADB_SASTATE_MATURE ||
  144                      sav->state == SADB_SASTATE_DYING)) {
  145                         cpi = sav->alg_enc;     /* XXX */
  146                         /* other parameters to look at? */
  147                 }
  148         }
  149         algo = ipcomp_algorithm_lookup(cpi);
  150         if (!algo) {
  151                 ipseclog((LOG_WARNING, "IPv4 IPComp input: unknown cpi %u\n",
  152                         cpi));
  153                 ipsecstat.in_nosa++;
  154                 goto fail;
  155         }
  156 
  157         /* chop ipcomp header */
  158         ipcomp = NULL;
  159         md->m_data += sizeof(struct ipcomp);
  160         md->m_len -= sizeof(struct ipcomp);
  161         m->m_pkthdr.len -= sizeof(struct ipcomp);
  162 #ifdef IPLEN_FLIPPED
  163         ip->ip_len -= sizeof(struct ipcomp);
  164 #else
  165         ip->ip_len = htons(ntohs(ip->ip_len) - sizeof(struct ipcomp));
  166 #endif
  167 
  168         olen = m->m_pkthdr.len;
  169         newlen = m->m_pkthdr.len - off;
  170         error = (*algo->decompress)(m, m->m_next, &newlen);
  171         if (error != 0) {
  172                 if (error == EINVAL)
  173                         ipsecstat.in_inval++;
  174                 else if (error == ENOBUFS)
  175                         ipsecstat.in_nomem++;
  176                 m = NULL;
  177                 goto fail;
  178         }
  179         ipsecstat.in_comphist[cpi]++;
  180 
  181         /*
  182          * returning decompressed packet onto icmp is meaningless.
  183          * mark it decrypted to prevent icmp from attaching original packet.
  184          */
  185         m->m_flags |= M_DECRYPTED;
  186 
  187         m->m_pkthdr.len = off + newlen;
  188         ip = mtod(m, struct ip *);
  189     {
  190         size_t len;
  191 #ifdef IPLEN_FLIPPED
  192         len = ip->ip_len;
  193 #else
  194         len = ntohs(ip->ip_len);
  195 #endif
  196         /*
  197          * be careful about underflow.  also, do not assign exact value
  198          * as ip_len is manipulated differently on *BSDs.
  199          */
  200         len += m->m_pkthdr.len;
  201         len -= olen;
  202         if (len & ~0xffff) {
  203                 /* packet too big after decompress */
  204                 ipsecstat.in_inval++;
  205                 goto fail;
  206         }
  207 #ifdef IPLEN_FLIPPED
  208         ip->ip_len = len & 0xffff;
  209 #else
  210         ip->ip_len = htons(len & 0xffff);
  211 #endif
  212         ip->ip_p = nxt;
  213     }
  214 
  215         if (sav) {
  216                 key_sa_recordxfer(sav, m);
  217                 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
  218                         ipsecstat.in_nomem++;
  219                         goto fail;
  220                 }
  221                 key_freesav(sav);
  222                 sav = NULL;
  223         }
  224 
  225         if (nxt != IPPROTO_DONE) {
  226                 if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
  227                     ipsec4_in_reject(m, NULL)) {
  228                         ipsecstat.in_polvio++;
  229                         goto fail;
  230                 }
  231                 (*inetsw[ip_protox[nxt]].pr_input)(m, off, nxt);
  232         } else
  233                 m_freem(m);
  234         m = NULL;
  235 
  236         ipsecstat.in_success++;
  237         return;
  238 
  239 fail:
  240         if (sav)
  241                 key_freesav(sav);
  242         if (m)
  243                 m_freem(m);
  244         return;
  245 }
  246 #endif /* INET */
  247 
  248 #ifdef INET6
  249 int
  250 ipcomp6_input(mp, offp, proto)
  251         struct mbuf **mp;
  252         int *offp, proto;
  253 {
  254         struct mbuf *m, *md;
  255         int off;
  256         struct ip6_hdr *ip6;
  257         struct ipcomp *ipcomp;
  258         const struct ipcomp_algorithm *algo;
  259         u_int16_t cpi;  /* host order */
  260         u_int16_t nxt;
  261         int error;
  262         size_t newlen;
  263         struct secasvar *sav = NULL;
  264         u_int8_t *prvnxtp;
  265 
  266         m = *mp;
  267         off = *offp;
  268 
  269         md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
  270         if (!md) {
  271                 m = NULL;       /* already freed */
  272                 ipseclog((LOG_DEBUG, "IPv6 IPComp input: assumption failed "
  273                     "(pulldown failure)\n"));
  274                 ipsec6stat.in_inval++;
  275                 goto fail;
  276         }
  277         ipcomp = mtod(md, struct ipcomp *);
  278         ip6 = mtod(m, struct ip6_hdr *);
  279         nxt = ipcomp->comp_nxt;
  280 
  281         cpi = ntohs(ipcomp->comp_cpi);
  282 
  283         if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
  284                 sav = key_allocsa(AF_INET6, (caddr_t)&ip6->ip6_src,
  285                         (caddr_t)&ip6->ip6_dst, IPPROTO_IPCOMP, 
  286                         htonl(cpi), 0, 0);
  287                 if (sav != NULL &&
  288                     (sav->state == SADB_SASTATE_MATURE ||
  289                      sav->state == SADB_SASTATE_DYING)) {
  290                         cpi = sav->alg_enc;     /* XXX */
  291                         /* other parameters to look at? */
  292                 }
  293         }
  294         algo = ipcomp_algorithm_lookup(cpi);
  295         if (!algo) {
  296                 ipseclog((LOG_WARNING, "IPv6 IPComp input: unknown cpi %u; "
  297                         "dropping the packet for simplicity\n", cpi));
  298                 ipsec6stat.in_nosa++;
  299                 goto fail;
  300         }
  301 
  302         /* chop ipcomp header */
  303         ipcomp = NULL;
  304         md->m_data += sizeof(struct ipcomp);
  305         md->m_len -= sizeof(struct ipcomp);
  306         m->m_pkthdr.len -= sizeof(struct ipcomp);
  307 
  308         newlen = m->m_pkthdr.len - off;
  309         error = (*algo->decompress)(m, md, &newlen);
  310         if (error != 0) {
  311                 if (error == EINVAL)
  312                         ipsec6stat.in_inval++;
  313                 else if (error == ENOBUFS)
  314                         ipsec6stat.in_nomem++;
  315                 m = NULL;
  316                 goto fail;
  317         }
  318         ipsec6stat.in_comphist[cpi]++;
  319         m->m_pkthdr.len = off + newlen;
  320 
  321         /*
  322          * returning decompressed packet onto icmp is meaningless.
  323          * mark it decrypted to prevent icmp from attaching original packet.
  324          */
  325         m->m_flags |= M_DECRYPTED;
  326 
  327         /* update next header field */
  328         prvnxtp = ip6_get_prevhdr(m, off);
  329         *prvnxtp = nxt;
  330 
  331         /*
  332          * no need to adjust payload length, as all the IPv6 protocols
  333          * look at m->m_pkthdr.len
  334          */
  335 
  336         if (sav) {
  337                 key_sa_recordxfer(sav, m);
  338                 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
  339                         ipsec6stat.in_nomem++;
  340                         goto fail;
  341                 }
  342                 key_freesav(sav);
  343                 sav = NULL;
  344         }
  345         *offp = off;
  346         *mp = m;
  347         ipsec6stat.in_success++;
  348         return nxt;
  349 
  350 fail:
  351         if (m)
  352                 m_freem(m);
  353         if (sav)
  354                 key_freesav(sav);
  355         return IPPROTO_DONE;
  356 }
  357 #endif /* INET6 */
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FreeBSD/Linux Kernel Cross Reference sys/netinet6/ipcomp_input.c

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sys/netinet6/ipcomp_input.c
