ipcomp_input.c

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    1 /*      $FreeBSD$       */
    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 #include <netinet/ipprotosw.h>
   87 extern struct ipprotosw inetsw[];
   88 
   89 void
   90 #if __STDC__
   91 ipcomp4_input(struct mbuf *m, ...)
   92 #else
   93 ipcomp4_input(m, va_alist)
   94         struct mbuf *m;
   95         va_dcl
   96 #endif
   97 {
   98         struct mbuf *md;
   99         struct ip *ip;
  100         struct ipcomp *ipcomp;
  101         const struct ipcomp_algorithm *algo;
  102         u_int16_t cpi;  /* host order */
  103         u_int16_t nxt;
  104         size_t hlen;
  105         int error;
  106         size_t newlen, olen;
  107         struct secasvar *sav = NULL;
  108         int off, proto;
  109         va_list ap;
  110 
  111         va_start(ap, m);
  112         off = va_arg(ap, int);
  113         proto = va_arg(ap, int);
  114         va_end(ap);
  115 
  116         if (m->m_pkthdr.len < off + sizeof(struct ipcomp)) {
  117                 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
  118                     "(packet too short)\n"));
  119                 ipsecstat.in_inval++;
  120                 goto fail;
  121         }
  122 
  123         md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
  124         if (!m) {
  125                 m = NULL;       /* already freed */
  126                 ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
  127                     "(pulldown failure)\n"));
  128                 ipsecstat.in_inval++;
  129                 goto fail;
  130         }
  131         ipcomp = mtod(md, struct ipcomp *);
  132         ip = mtod(m, struct ip *);
  133         nxt = ipcomp->comp_nxt;
  134 #ifdef _IP_VHL
  135         hlen = IP_VHL_HL(ip->ip_vhl) << 2;
  136 #else
  137         hlen = ip->ip_hl << 2;
  138 #endif
  139 
  140         cpi = ntohs(ipcomp->comp_cpi);
  141 
  142         if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
  143                 sav = key_allocsa(AF_INET, (caddr_t)&ip->ip_src,
  144                         (caddr_t)&ip->ip_dst, IPPROTO_IPCOMP, htonl(cpi));
  145                 if (sav != NULL
  146                  && (sav->state == SADB_SASTATE_MATURE
  147                   || sav->state == SADB_SASTATE_DYING)) {
  148                         cpi = sav->alg_enc;     /* XXX */
  149                         /* other parameters to look at? */
  150                 }
  151         }
  152         algo = ipcomp_algorithm_lookup(cpi);
  153         if (!algo) {
  154                 ipseclog((LOG_WARNING, "IPv4 IPComp input: unknown cpi %u\n",
  155                         cpi));
  156                 ipsecstat.in_nosa++;
  157                 goto fail;
  158         }
  159 
  160         /* chop ipcomp header */
  161         ipcomp = NULL;
  162         md->m_data += sizeof(struct ipcomp);
  163         md->m_len -= sizeof(struct ipcomp);
  164         m->m_pkthdr.len -= sizeof(struct ipcomp);
  165 #ifdef IPLEN_FLIPPED
  166         ip->ip_len -= sizeof(struct ipcomp);
  167 #else
  168         ip->ip_len = htons(ntohs(ip->ip_len) - sizeof(struct ipcomp));
  169 #endif
  170 
  171         olen = m->m_pkthdr.len;
  172         newlen = m->m_pkthdr.len - off;
  173         error = (*algo->decompress)(m, m->m_next, &newlen);
  174         if (error != 0) {
  175                 if (error == EINVAL)
  176                         ipsecstat.in_inval++;
  177                 else if (error == ENOBUFS)
  178                         ipsecstat.in_nomem++;
  179                 m = NULL;
  180                 goto fail;
  181         }
  182         ipsecstat.in_comphist[cpi]++;
  183 
  184         /*
  185          * returning decompressed packet onto icmp is meaningless.
  186          * mark it decrypted to prevent icmp from attaching original packet.
  187          */
  188         m->m_flags |= M_DECRYPTED;
  189 
  190         m->m_pkthdr.len = off + newlen;
  191         ip = mtod(m, struct ip *);
  192     {
  193         size_t len;
  194 #ifdef IPLEN_FLIPPED
  195         len = ip->ip_len;
  196 #else
  197         len = ntohs(ip->ip_len);
  198 #endif
  199         /*
  200          * be careful about underflow.  also, do not assign exact value
  201          * as ip_len is manipulated differently on *BSDs.
  202          */
  203         len += m->m_pkthdr.len;
  204         len -= olen;
  205         if (len & ~0xffff) {
  206                 /* packet too big after decompress */
  207                 ipsecstat.in_inval++;
  208                 goto fail;
  209         }
  210 #ifdef IPLEN_FLIPPED
  211         ip->ip_len = len & 0xffff;
  212 #else
  213         ip->ip_len = htons(len & 0xffff);
  214 #endif
  215         ip->ip_p = nxt;
  216     }
  217 
  218         if (sav) {
  219                 key_sa_recordxfer(sav, m);
  220                 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
  221                         ipsecstat.in_nomem++;
  222                         goto fail;
  223                 }
  224                 key_freesav(sav);
  225                 sav = NULL;
  226         }
  227 
  228         if (nxt != IPPROTO_DONE) {
  229                 if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
  230                     ipsec4_in_reject(m, NULL)) {
  231                         ipsecstat.in_polvio++;
  232                         goto fail;
  233                 }
  234                 (*inetsw[ip_protox[nxt]].pr_input)(m, off, nxt);
  235         } else
  236                 m_freem(m);
  237         m = NULL;
  238 
  239         ipsecstat.in_success++;
  240         return;
  241 
  242 fail:
  243         if (sav)
  244                 key_freesav(sav);
  245         if (m)
  246                 m_freem(m);
  247         return;
  248 }
  249 #endif /* INET */
  250 
  251 #ifdef INET6
  252 int
  253 ipcomp6_input(mp, offp, proto)
  254         struct mbuf **mp;
  255         int *offp, proto;
  256 {
  257         struct mbuf *m, *md;
  258         int off;
  259         struct ip6_hdr *ip6;
  260         struct ipcomp *ipcomp;
  261         const struct ipcomp_algorithm *algo;
  262         u_int16_t cpi;  /* host order */
  263         u_int16_t nxt;
  264         int error;
  265         size_t newlen;
  266         struct secasvar *sav = NULL;
  267         char *prvnxtp;
  268 
  269         m = *mp;
  270         off = *offp;
  271 
  272         md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
  273         if (!m) {
  274                 m = NULL;       /* already freed */
  275                 ipseclog((LOG_DEBUG, "IPv6 IPComp input: assumption failed "
  276                     "(pulldown failure)\n"));
  277                 ipsec6stat.in_inval++;
  278                 goto fail;
  279         }
  280         ipcomp = mtod(md, struct ipcomp *);
  281         ip6 = mtod(m, struct ip6_hdr *);
  282         nxt = ipcomp->comp_nxt;
  283 
  284         cpi = ntohs(ipcomp->comp_cpi);
  285 
  286         if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
  287                 sav = key_allocsa(AF_INET6, (caddr_t)&ip6->ip6_src,
  288                         (caddr_t)&ip6->ip6_dst, IPPROTO_IPCOMP, htonl(cpi));
  289                 if (sav != NULL
  290                  && (sav->state == SADB_SASTATE_MATURE
  291                   || sav->state == SADB_SASTATE_DYING)) {
  292                         cpi = sav->alg_enc;     /* XXX */
  293                         /* other parameters to look at? */
  294                 }
  295         }
  296         algo = ipcomp_algorithm_lookup(cpi);
  297         if (!algo) {
  298                 ipseclog((LOG_WARNING, "IPv6 IPComp input: unknown cpi %u; "
  299                         "dropping the packet for simplicity\n", cpi));
  300                 ipsec6stat.in_nosa++;
  301                 goto fail;
  302         }
  303 
  304         /* chop ipcomp header */
  305         ipcomp = NULL;
  306         md->m_data += sizeof(struct ipcomp);
  307         md->m_len -= sizeof(struct ipcomp);
  308         m->m_pkthdr.len -= sizeof(struct ipcomp);
  309 
  310         newlen = m->m_pkthdr.len - off;
  311         error = (*algo->decompress)(m, md, &newlen);
  312         if (error != 0) {
  313                 if (error == EINVAL)
  314                         ipsec6stat.in_inval++;
  315                 else if (error == ENOBUFS)
  316                         ipsec6stat.in_nomem++;
  317                 m = NULL;
  318                 goto fail;
  319         }
  320         ipsec6stat.in_comphist[cpi]++;
  321         m->m_pkthdr.len = off + newlen;
  322 
  323         /*
  324          * returning decompressed packet onto icmp is meaningless.
  325          * mark it decrypted to prevent icmp from attaching original packet.
  326          */
  327         m->m_flags |= M_DECRYPTED;
  328 
  329         /* update next header field */
  330         prvnxtp = ip6_get_prevhdr(m, off);
  331         *prvnxtp = nxt;
  332 
  333         /*
  334          * no need to adjust payload length, as all the IPv6 protocols
  335          * look at m->m_pkthdr.len
  336          */
  337 
  338         if (sav) {
  339                 key_sa_recordxfer(sav, m);
  340                 if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
  341                         ipsec6stat.in_nomem++;
  342                         goto fail;
  343                 }
  344                 key_freesav(sav);
  345                 sav = NULL;
  346         }
  347         *offp = off;
  348         *mp = m;
  349         ipsec6stat.in_success++;
  350         return nxt;
  351 
  352 fail:
  353         if (m)
  354                 m_freem(m);
  355         if (sav)
  356                 key_freesav(sav);
  357         return IPPROTO_DONE;
  358 }
  359 #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
