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/in6_gif.c

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    1 /*      $FreeBSD: src/sys/netinet6/in6_gif.c,v 1.2.2.7 2003/01/23 21:06:47 sam Exp $    */
    2 /*      $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $        */
    3 
    4 /*
    5  * Copyright (C) 1995, 1996, 1997, and 1998 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 #include "opt_inet.h"
   34 #include "opt_inet6.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/socket.h>
   39 #include <sys/sockio.h>
   40 #include <sys/mbuf.h>
   41 #include <sys/errno.h>
   42 #include <sys/queue.h>
   43 #include <sys/syslog.h>
   44 #include <sys/protosw.h>
   45 
   46 #include <sys/malloc.h>
   47 
   48 #include <net/if.h>
   49 #include <net/route.h>
   50 
   51 #include <netinet/in.h>
   52 #include <netinet/in_systm.h>
   53 #ifdef INET
   54 #include <netinet/ip.h>
   55 #endif
   56 #include <netinet/ip_encap.h>
   57 #ifdef INET6
   58 #include <netinet/ip6.h>
   59 #include <netinet6/ip6_var.h>
   60 #include <netinet6/in6_gif.h>
   61 #include <netinet6/in6_var.h>
   62 #endif
   63 #include <netinet6/ip6protosw.h>
   64 #include <netinet/ip_ecn.h>
   65 #ifdef INET6
   66 #include <netinet6/ip6_ecn.h>
   67 #endif
   68 
   69 #include <net/gif/if_gif.h>
   70 
   71 #include <net/net_osdep.h>
   72 
   73 #ifdef INET6
   74 static int gif_validate6(const struct ip6_hdr *, struct gif_softc *,
   75                          struct ifnet *);
   76 
   77 extern  struct domain inet6domain;
   78 struct protosw in6_gif_protosw =
   79     {
   80         .pr_type = SOCK_RAW,
   81         .pr_domain = &inet6domain,
   82         .pr_protocol = 0/*IPPROTO_IPV[46]*/,
   83         .pr_flags = PR_ATOMIC|PR_ADDR,
   84 
   85         .pr_input = in6_gif_input,
   86         .pr_output = rip6_output,
   87         .pr_ctlinput = NULL,
   88         .pr_ctloutput = rip6_ctloutput,
   89 
   90         .pr_usrreqs = &rip6_usrreqs
   91     };
   92 
   93 /*
   94  * family = family of the packet to be encapsulate.
   95  */
   96 int
   97 in6_gif_output(struct ifnet *ifp, int family, struct mbuf *m)
   98 {
   99         struct gif_softc *sc = (struct gif_softc*)ifp;
  100         struct route_in6 *ro = &sc->gif_ro6[mycpu->gd_cpuid];
  101         struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&ro->ro_dst;
  102         struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
  103         struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
  104         struct ip6_hdr *ip6;
  105         int proto;
  106         u_int8_t itos, otos;
  107 
  108         if (sin6_src == NULL || sin6_dst == NULL ||
  109             sin6_src->sin6_family != AF_INET6 ||
  110             sin6_dst->sin6_family != AF_INET6) {
  111                 m_freem(m);
  112                 return EAFNOSUPPORT;
  113         }
  114 
  115         switch (family) {
  116 #ifdef INET
  117         case AF_INET:
  118             {
  119                 struct ip *ip;
  120 
  121                 proto = IPPROTO_IPV4;
  122                 if (m->m_len < sizeof(*ip)) {
  123                         m = m_pullup(m, sizeof(*ip));
  124                         if (!m)
  125                                 return ENOBUFS;
  126                 }
  127                 ip = mtod(m, struct ip *);
  128                 itos = ip->ip_tos;
  129                 break;
  130             }
  131 #endif
  132 #ifdef INET6
  133         case AF_INET6:
  134             {
  135                 struct ip6_hdr *ip6;
  136                 proto = IPPROTO_IPV6;
  137                 if (m->m_len < sizeof(*ip6)) {
  138                         m = m_pullup(m, sizeof(*ip6));
  139                         if (!m)
  140                                 return ENOBUFS;
  141                 }
  142                 ip6 = mtod(m, struct ip6_hdr *);
  143                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  144                 break;
  145             }
  146 #endif
  147         default:
  148 #ifdef DEBUG
  149                 kprintf("in6_gif_output: warning: unknown family %d passed\n",
  150                         family);
  151 #endif
  152                 m_freem(m);
  153                 return EAFNOSUPPORT;
  154         }
  155         
  156         /* prepend new IP header */
  157         M_PREPEND(m, sizeof(struct ip6_hdr), MB_DONTWAIT);
  158         if (m && m->m_len < sizeof(struct ip6_hdr))
  159                 m = m_pullup(m, sizeof(struct ip6_hdr));
  160         if (m == NULL) {
  161                 kprintf("ENOBUFS in in6_gif_output %d\n", __LINE__);
  162                 return ENOBUFS;
  163         }
  164 
  165         ip6 = mtod(m, struct ip6_hdr *);
  166         ip6->ip6_flow   = 0;
  167         ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  168         ip6->ip6_vfc    |= IPV6_VERSION;
  169         ip6->ip6_plen   = htons((u_short)m->m_pkthdr.len);
  170         ip6->ip6_nxt    = proto;
  171         ip6->ip6_hlim   = ip6_gif_hlim;
  172         ip6->ip6_src    = sin6_src->sin6_addr;
  173         /* bidirectional configured tunnel mode */
  174         if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
  175                 ip6->ip6_dst = sin6_dst->sin6_addr;
  176         else  {
  177                 m_freem(m);
  178                 return ENETUNREACH;
  179         }
  180         if (ifp->if_flags & IFF_LINK1)
  181                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  182         else
  183                 ip_ecn_ingress(ECN_NOCARE, &otos, &itos);
  184         ip6->ip6_flow &= ~ntohl(0xff00000);
  185         ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
  186 
  187         if (dst->sin6_family != sin6_dst->sin6_family ||
  188              !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
  189                 /* cache route doesn't match */
  190                 bzero(dst, sizeof(*dst));
  191                 dst->sin6_family = sin6_dst->sin6_family;
  192                 dst->sin6_len = sizeof(struct sockaddr_in6);
  193                 dst->sin6_addr = sin6_dst->sin6_addr;
  194                 if (ro->ro_rt != NULL) {
  195                         RTFREE(ro->ro_rt);
  196                         ro->ro_rt = NULL;
  197                 }
  198 #if 0
  199                 sc->gif_if.if_mtu = GIF_MTU;
  200 #endif
  201         }
  202 
  203         if (ro->ro_rt == NULL) {
  204                 rtalloc((struct route *)ro);
  205                 if (ro->ro_rt == NULL) {
  206                         m_freem(m);
  207                         return ENETUNREACH;
  208                 }
  209 
  210                 /* if it constitutes infinite encapsulation, punt. */
  211                 if (ro->ro_rt->rt_ifp == ifp) {
  212                         m_freem(m);
  213                         return ENETUNREACH;     /*XXX*/
  214                 }
  215 #if 0
  216                 ifp->if_mtu = ro->ro_rt->rt_ifp->if_mtu -
  217                               sizeof(struct ip6_hdr);
  218 #endif
  219         }
  220         
  221 #ifdef IPV6_MINMTU
  222         /*
  223          * force fragmentation to minimum MTU, to avoid path MTU discovery.
  224          * it is too painful to ask for resend of inner packet, to achieve
  225          * path MTU discovery for encapsulated packets.
  226          */
  227         return (ip6_output(m, 0, ro, IPV6_MINMTU, 0, NULL, NULL));
  228 #else
  229         return (ip6_output(m, 0, ro, 0, 0, NULL, NULL));
  230 #endif
  231 }
  232 
  233 int
  234 in6_gif_input(struct mbuf **mp, int *offp, int proto)
  235 {
  236         struct mbuf *m = *mp;
  237         struct ifnet *gifp = NULL;
  238         struct ip6_hdr *ip6;
  239         int af = 0;
  240         u_int32_t otos;
  241 
  242         ip6 = mtod(m, struct ip6_hdr *);
  243 
  244         gifp = (struct ifnet *)encap_getarg(m);
  245 
  246         if (gifp == NULL || !(gifp->if_flags & IFF_UP)) {
  247                 m_freem(m);
  248                 ip6stat.ip6s_nogif++;
  249                 return IPPROTO_DONE;
  250         }
  251 
  252         otos = ip6->ip6_flow;
  253         m_adj(m, *offp);
  254 
  255         switch (proto) {
  256 #ifdef INET
  257         case IPPROTO_IPV4:
  258             {
  259                 struct ip *ip;
  260                 u_int8_t otos8;
  261                 af = AF_INET;
  262                 otos8 = (ntohl(otos) >> 20) & 0xff;
  263                 if (m->m_len < sizeof(*ip)) {
  264                         m = m_pullup(m, sizeof(*ip));
  265                         if (!m)
  266                                 return IPPROTO_DONE;
  267                 }
  268                 ip = mtod(m, struct ip *);
  269                 if (gifp->if_flags & IFF_LINK1)
  270                         ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos);
  271                 else
  272                         ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
  273                 break;
  274             }
  275 #endif /* INET */
  276 #ifdef INET6
  277         case IPPROTO_IPV6:
  278             {
  279                 struct ip6_hdr *ip6;
  280                 af = AF_INET6;
  281                 if (m->m_len < sizeof(*ip6)) {
  282                         m = m_pullup(m, sizeof(*ip6));
  283                         if (!m)
  284                                 return IPPROTO_DONE;
  285                 }
  286                 ip6 = mtod(m, struct ip6_hdr *);
  287                 if (gifp->if_flags & IFF_LINK1)
  288                         ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6->ip6_flow);
  289                 else
  290                         ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);
  291                 break;
  292             }
  293 #endif
  294         default:
  295                 ip6stat.ip6s_nogif++;
  296                 m_freem(m);
  297                 return IPPROTO_DONE;
  298         }
  299                 
  300         gif_input(m, af, gifp);
  301         return IPPROTO_DONE;
  302 }
  303 
  304 /*
  305  * validate outer address.
  306  */
  307 static int
  308 gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc,
  309               struct ifnet *ifp)
  310 {
  311         struct sockaddr_in6 *src, *dst;
  312 
  313         src = (struct sockaddr_in6 *)sc->gif_psrc;
  314         dst = (struct sockaddr_in6 *)sc->gif_pdst;
  315 
  316         /*
  317          * Check for address match.  Note that the check is for an incoming
  318          * packet.  We should compare the *source* address in our configuration
  319          * and the *destination* address of the packet, and vice versa.
  320          */
  321         if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
  322             !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
  323                 return 0;
  324 
  325         /* martian filters on outer source - done in ip6_input */
  326 
  327         /* ingress filters on outer source */
  328         if (!(sc->gif_if.if_flags & IFF_LINK2) && ifp) {
  329                 struct sockaddr_in6 sin6;
  330                 struct rtentry *rt;
  331 
  332                 bzero(&sin6, sizeof(sin6));
  333                 sin6.sin6_family = AF_INET6;
  334                 sin6.sin6_len = sizeof(struct sockaddr_in6);
  335                 sin6.sin6_addr = ip6->ip6_src;
  336                 sin6.sin6_scope_id = 0; /* XXX */
  337 
  338                 rt = rtpurelookup((struct sockaddr *)&sin6);
  339                 if (rt != NULL)
  340                         --rt->rt_refcnt;
  341                 if (rt == NULL || rt->rt_ifp != ifp) {
  342 #if 0
  343                         log(LOG_WARNING, "%s: packet from %s dropped "
  344                             "due to ingress filter\n", if_name(&sc->gif_if),
  345                             ip6_sprintf(&sin6.sin6_addr));
  346 #endif
  347                         return 0;
  348                 }
  349         }
  350 
  351         return 128 * 2;
  352 }
  353 
  354 /*
  355  * we know that we are in IFF_UP, outer address available, and outer family
  356  * matched the physical addr family.  see gif_encapcheck().
  357  * sanity check for arg should have been done in the caller.
  358  */
  359 int
  360 gif_encapcheck6(const struct mbuf *m, int off, int proto, void *arg)
  361 {
  362         struct ip6_hdr ip6;
  363         struct gif_softc *sc;
  364         struct ifnet *ifp;
  365 
  366         /* sanity check done in caller */
  367         sc = (struct gif_softc *)arg;
  368 
  369         m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
  370         ifp = (m->m_flags & M_PKTHDR) ? m->m_pkthdr.rcvif : NULL;
  371 
  372         return gif_validate6(&ip6, sc, ifp);
  373 }
  374 
  375 int
  376 in6_gif_attach(struct gif_softc *sc)
  377 {
  378         sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
  379             &in6_gif_protosw, sc);
  380         if (sc->encap_cookie6 == NULL)
  381                 return EEXIST;
  382         return 0;
  383 }
  384 
  385 int
  386 in6_gif_detach(struct gif_softc *sc)
  387 {
  388         int error;
  389 
  390         error = encap_detach(sc->encap_cookie6);
  391         if (error == 0)
  392                 sc->encap_cookie6 = NULL;
  393         return error;
  394 }
  395 
  396 #endif /* INET6 */

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