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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6_gif.c

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    1 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/8.0/sys/netinet6/in6_gif.c 196019 2009-08-01 19:26:27Z rwatson $");
   34 
   35 #include "opt_inet.h"
   36 #include "opt_inet6.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/socket.h>
   41 #include <sys/sockio.h>
   42 #include <sys/mbuf.h>
   43 #include <sys/errno.h>
   44 #include <sys/queue.h>
   45 #include <sys/syslog.h>
   46 #include <sys/protosw.h>
   47 #include <sys/malloc.h>
   48 
   49 #include <net/if.h>
   50 #include <net/route.h>
   51 
   52 #include <netinet/in.h>
   53 #include <netinet/in_systm.h>
   54 #ifdef INET
   55 #include <netinet/ip.h>
   56 #endif
   57 #include <netinet/ip_encap.h>
   58 #ifdef INET6
   59 #include <netinet/ip6.h>
   60 #include <netinet6/ip6_var.h>
   61 #include <netinet6/in6_gif.h>
   62 #include <netinet6/in6_var.h>
   63 #endif
   64 #include <netinet6/ip6protosw.h>
   65 #include <netinet/ip_ecn.h>
   66 #ifdef INET6
   67 #include <netinet6/ip6_ecn.h>
   68 #endif
   69 
   70 #include <net/if_gif.h>
   71 
   72 static int gif_validate6(const struct ip6_hdr *, struct gif_softc *,
   73                          struct ifnet *);
   74 
   75 extern  struct domain inet6domain;
   76 struct ip6protosw in6_gif_protosw = {
   77         .pr_type =      SOCK_RAW,
   78         .pr_domain =    &inet6domain,
   79         .pr_protocol =  0,                      /* IPPROTO_IPV[46] */
   80         .pr_flags =     PR_ATOMIC|PR_ADDR,
   81         .pr_input =     in6_gif_input,
   82         .pr_output =    rip6_output,
   83         .pr_ctloutput = rip6_ctloutput,
   84         .pr_usrreqs =   &rip6_usrreqs
   85 };
   86 
   87 int
   88 in6_gif_output(struct ifnet *ifp,
   89     int family,                 /* family of the packet to be encapsulate */
   90     struct mbuf *m)
   91 {
   92         struct gif_softc *sc = ifp->if_softc;
   93         struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
   94         struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
   95         struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
   96         struct ip6_hdr *ip6;
   97         struct etherip_header eiphdr;
   98         int error, len, proto;
   99         u_int8_t itos, otos;
  100 
  101         GIF_LOCK_ASSERT(sc);
  102 
  103         if (sin6_src == NULL || sin6_dst == NULL ||
  104             sin6_src->sin6_family != AF_INET6 ||
  105             sin6_dst->sin6_family != AF_INET6) {
  106                 m_freem(m);
  107                 return EAFNOSUPPORT;
  108         }
  109 
  110         switch (family) {
  111 #ifdef INET
  112         case AF_INET:
  113             {
  114                 struct ip *ip;
  115 
  116                 proto = IPPROTO_IPV4;
  117                 if (m->m_len < sizeof(*ip)) {
  118                         m = m_pullup(m, sizeof(*ip));
  119                         if (!m)
  120                                 return ENOBUFS;
  121                 }
  122                 ip = mtod(m, struct ip *);
  123                 itos = ip->ip_tos;
  124                 break;
  125             }
  126 #endif
  127 #ifdef INET6
  128         case AF_INET6:
  129             {
  130                 struct ip6_hdr *ip6;
  131                 proto = IPPROTO_IPV6;
  132                 if (m->m_len < sizeof(*ip6)) {
  133                         m = m_pullup(m, sizeof(*ip6));
  134                         if (!m)
  135                                 return ENOBUFS;
  136                 }
  137                 ip6 = mtod(m, struct ip6_hdr *);
  138                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  139                 break;
  140             }
  141 #endif
  142         case AF_LINK:
  143                 proto = IPPROTO_ETHERIP;
  144 
  145                 /*
  146                  * GIF_SEND_REVETHIP (disabled by default) intentionally
  147                  * sends an EtherIP packet with revered version field in
  148                  * the header.  This is a knob for backward compatibility
  149                  * with FreeBSD 7.2R or prior.
  150                  */
  151                 if ((sc->gif_options & GIF_SEND_REVETHIP)) {
  152                         eiphdr.eip_ver = 0;
  153                         eiphdr.eip_resvl = ETHERIP_VERSION;
  154                         eiphdr.eip_resvh = 0;
  155                 } else {
  156                         eiphdr.eip_ver = ETHERIP_VERSION;
  157                         eiphdr.eip_resvl = 0;
  158                         eiphdr.eip_resvh = 0;
  159                 }
  160                 /* prepend Ethernet-in-IP header */
  161                 M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
  162                 if (m && m->m_len < sizeof(struct etherip_header))
  163                         m = m_pullup(m, sizeof(struct etherip_header));
  164                 if (m == NULL)
  165                         return ENOBUFS;
  166                 bcopy(&eiphdr, mtod(m, struct etherip_header *),
  167                     sizeof(struct etherip_header));
  168                 break;
  169 
  170         default:
  171 #ifdef DEBUG
  172                 printf("in6_gif_output: warning: unknown family %d passed\n",
  173                         family);
  174 #endif
  175                 m_freem(m);
  176                 return EAFNOSUPPORT;
  177         }
  178 
  179         /* prepend new IP header */
  180         len = sizeof(struct ip6_hdr);
  181 #ifndef __NO_STRICT_ALIGNMENT
  182         if (family == AF_LINK)
  183                 len += ETHERIP_ALIGN;
  184 #endif
  185         M_PREPEND(m, len, M_DONTWAIT);
  186         if (m != NULL && m->m_len < len)
  187                 m = m_pullup(m, len);
  188         if (m == NULL) {
  189                 printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
  190                 return ENOBUFS;
  191         }
  192 #ifndef __NO_STRICT_ALIGNMENT
  193         if (family == AF_LINK) {
  194                 len = mtod(m, vm_offset_t) & 3;
  195                 KASSERT(len == 0 || len == ETHERIP_ALIGN,
  196                     ("in6_gif_output: unexpected misalignment"));
  197                 m->m_data += len;
  198                 m->m_len -= ETHERIP_ALIGN;
  199         }
  200 #endif
  201 
  202         ip6 = mtod(m, struct ip6_hdr *);
  203         ip6->ip6_flow   = 0;
  204         ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  205         ip6->ip6_vfc    |= IPV6_VERSION;
  206         ip6->ip6_plen   = htons((u_short)m->m_pkthdr.len);
  207         ip6->ip6_nxt    = proto;
  208         ip6->ip6_hlim   = V_ip6_gif_hlim;
  209         ip6->ip6_src    = sin6_src->sin6_addr;
  210         /* bidirectional configured tunnel mode */
  211         if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
  212                 ip6->ip6_dst = sin6_dst->sin6_addr;
  213         else  {
  214                 m_freem(m);
  215                 return ENETUNREACH;
  216         }
  217         ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
  218                        &otos, &itos);
  219         ip6->ip6_flow &= ~htonl(0xff << 20);
  220         ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
  221 
  222         if (dst->sin6_family != sin6_dst->sin6_family ||
  223              !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
  224                 /* cache route doesn't match */
  225                 bzero(dst, sizeof(*dst));
  226                 dst->sin6_family = sin6_dst->sin6_family;
  227                 dst->sin6_len = sizeof(struct sockaddr_in6);
  228                 dst->sin6_addr = sin6_dst->sin6_addr;
  229                 if (sc->gif_ro6.ro_rt) {
  230                         RTFREE(sc->gif_ro6.ro_rt);
  231                         sc->gif_ro6.ro_rt = NULL;
  232                 }
  233 #if 0
  234                 GIF2IFP(sc)->if_mtu = GIF_MTU;
  235 #endif
  236         }
  237 
  238         if (sc->gif_ro6.ro_rt == NULL) {
  239                 rtalloc((struct route *)&sc->gif_ro6);
  240                 if (sc->gif_ro6.ro_rt == NULL) {
  241                         m_freem(m);
  242                         return ENETUNREACH;
  243                 }
  244 
  245                 /* if it constitutes infinite encapsulation, punt. */
  246                 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
  247                         m_freem(m);
  248                         return ENETUNREACH;     /*XXX*/
  249                 }
  250 #if 0
  251                 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
  252                         - sizeof(struct ip6_hdr);
  253 #endif
  254         }
  255 
  256 #ifdef IPV6_MINMTU
  257         /*
  258          * force fragmentation to minimum MTU, to avoid path MTU discovery.
  259          * it is too painful to ask for resend of inner packet, to achieve
  260          * path MTU discovery for encapsulated packets.
  261          */
  262         error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL);
  263 #else
  264         error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL);
  265 #endif
  266 
  267         if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) &&
  268             sc->gif_ro6.ro_rt != NULL) {
  269                 RTFREE(sc->gif_ro6.ro_rt);
  270                 sc->gif_ro6.ro_rt = NULL;
  271         }
  272 
  273         return (error);
  274 }
  275 
  276 int
  277 in6_gif_input(struct mbuf **mp, int *offp, int proto)
  278 {
  279         struct mbuf *m = *mp;
  280         struct ifnet *gifp = NULL;
  281         struct gif_softc *sc;
  282         struct ip6_hdr *ip6;
  283         int af = 0;
  284         u_int32_t otos;
  285 
  286         ip6 = mtod(m, struct ip6_hdr *);
  287 
  288         sc = (struct gif_softc *)encap_getarg(m);
  289         if (sc == NULL) {
  290                 m_freem(m);
  291                 V_ip6stat.ip6s_nogif++;
  292                 return IPPROTO_DONE;
  293         }
  294 
  295         gifp = GIF2IFP(sc);
  296         if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
  297                 m_freem(m);
  298                 V_ip6stat.ip6s_nogif++;
  299                 return IPPROTO_DONE;
  300         }
  301 
  302         otos = ip6->ip6_flow;
  303         m_adj(m, *offp);
  304 
  305         switch (proto) {
  306 #ifdef INET
  307         case IPPROTO_IPV4:
  308             {
  309                 struct ip *ip;
  310                 u_int8_t otos8;
  311                 af = AF_INET;
  312                 otos8 = (ntohl(otos) >> 20) & 0xff;
  313                 if (m->m_len < sizeof(*ip)) {
  314                         m = m_pullup(m, sizeof(*ip));
  315                         if (!m)
  316                                 return IPPROTO_DONE;
  317                 }
  318                 ip = mtod(m, struct ip *);
  319                 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  320                                   ECN_ALLOWED : ECN_NOCARE,
  321                                   &otos8, &ip->ip_tos) == 0) {
  322                         m_freem(m);
  323                         return IPPROTO_DONE;
  324                 }
  325                 break;
  326             }
  327 #endif /* INET */
  328 #ifdef INET6
  329         case IPPROTO_IPV6:
  330             {
  331                 struct ip6_hdr *ip6;
  332                 af = AF_INET6;
  333                 if (m->m_len < sizeof(*ip6)) {
  334                         m = m_pullup(m, sizeof(*ip6));
  335                         if (!m)
  336                                 return IPPROTO_DONE;
  337                 }
  338                 ip6 = mtod(m, struct ip6_hdr *);
  339                 if (ip6_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  340                                    ECN_ALLOWED : ECN_NOCARE,
  341                                    &otos, &ip6->ip6_flow) == 0) {
  342                         m_freem(m);
  343                         return IPPROTO_DONE;
  344                 }
  345                 break;
  346             }
  347 #endif
  348         case IPPROTO_ETHERIP:
  349                 af = AF_LINK;
  350                 break;
  351 
  352         default:
  353                 V_ip6stat.ip6s_nogif++;
  354                 m_freem(m);
  355                 return IPPROTO_DONE;
  356         }
  357 
  358         gif_input(m, af, gifp);
  359         return IPPROTO_DONE;
  360 }
  361 
  362 /*
  363  * validate outer address.
  364  */
  365 static int
  366 gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc,
  367     struct ifnet *ifp)
  368 {
  369         struct sockaddr_in6 *src, *dst;
  370 
  371         src = (struct sockaddr_in6 *)sc->gif_psrc;
  372         dst = (struct sockaddr_in6 *)sc->gif_pdst;
  373 
  374         /*
  375          * Check for address match.  Note that the check is for an incoming
  376          * packet.  We should compare the *source* address in our configuration
  377          * and the *destination* address of the packet, and vice versa.
  378          */
  379         if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
  380             !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
  381                 return 0;
  382 
  383         /* martian filters on outer source - done in ip6_input */
  384 
  385         /* ingress filters on outer source */
  386         if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
  387                 struct sockaddr_in6 sin6;
  388                 struct rtentry *rt;
  389 
  390                 bzero(&sin6, sizeof(sin6));
  391                 sin6.sin6_family = AF_INET6;
  392                 sin6.sin6_len = sizeof(struct sockaddr_in6);
  393                 sin6.sin6_addr = ip6->ip6_src;
  394                 sin6.sin6_scope_id = 0; /* XXX */
  395 
  396                 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
  397                 if (!rt || rt->rt_ifp != ifp) {
  398 #if 0
  399                         char ip6buf[INET6_ADDRSTRLEN];
  400                         log(LOG_WARNING, "%s: packet from %s dropped "
  401                             "due to ingress filter\n", if_name(GIF2IFP(sc)),
  402                             ip6_sprintf(ip6buf, &sin6.sin6_addr));
  403 #endif
  404                         if (rt)
  405                                 RTFREE_LOCKED(rt);
  406                         return 0;
  407                 }
  408                 RTFREE_LOCKED(rt);
  409         }
  410 
  411         return 128 * 2;
  412 }
  413 
  414 /*
  415  * we know that we are in IFF_UP, outer address available, and outer family
  416  * matched the physical addr family.  see gif_encapcheck().
  417  * sanity check for arg should have been done in the caller.
  418  */
  419 int
  420 gif_encapcheck6(const struct mbuf *m, int off, int proto, void *arg)
  421 {
  422         struct ip6_hdr ip6;
  423         struct gif_softc *sc;
  424         struct ifnet *ifp;
  425 
  426         /* sanity check done in caller */
  427         sc = (struct gif_softc *)arg;
  428 
  429         /* LINTED const cast */
  430         m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
  431         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  432 
  433         return gif_validate6(&ip6, sc, ifp);
  434 }
  435 
  436 int
  437 in6_gif_attach(struct gif_softc *sc)
  438 {
  439         sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
  440             (void *)&in6_gif_protosw, sc);
  441         if (sc->encap_cookie6 == NULL)
  442                 return EEXIST;
  443         return 0;
  444 }
  445 
  446 int
  447 in6_gif_detach(struct gif_softc *sc)
  448 {
  449         int error;
  450 
  451         error = encap_detach(sc->encap_cookie6);
  452         if (error == 0)
  453                 sc->encap_cookie6 = NULL;
  454         return error;
  455 }

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