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 /*-
    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/8.3/sys/netinet6/in6_gif.c 207695 2010-05-06 06:44:19Z bz $");
   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/kernel.h>
   45 #include <sys/queue.h>
   46 #include <sys/syslog.h>
   47 #include <sys/sysctl.h>
   48 #include <sys/protosw.h>
   49 #include <sys/malloc.h>
   50 
   51 #include <net/if.h>
   52 #include <net/route.h>
   53 
   54 #include <netinet/in.h>
   55 #include <netinet/in_systm.h>
   56 #ifdef INET
   57 #include <netinet/ip.h>
   58 #endif
   59 #include <netinet/ip_encap.h>
   60 #ifdef INET6
   61 #include <netinet/ip6.h>
   62 #include <netinet6/ip6_var.h>
   63 #include <netinet6/in6_gif.h>
   64 #include <netinet6/in6_var.h>
   65 #endif
   66 #include <netinet6/ip6protosw.h>
   67 #include <netinet/ip_ecn.h>
   68 #ifdef INET6
   69 #include <netinet6/ip6_ecn.h>
   70 #endif
   71 
   72 #include <net/if_gif.h>
   73 
   74 VNET_DEFINE(int, ip6_gif_hlim) = GIF_HLIM;
   75 #define V_ip6_gif_hlim                  VNET(ip6_gif_hlim)
   76 
   77 SYSCTL_DECL(_net_inet6_ip6);
   78 SYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM, gifhlim, CTLFLAG_RW,
   79     &VNET_NAME(ip6_gif_hlim), 0, "");
   80 
   81 static int gif_validate6(const struct ip6_hdr *, struct gif_softc *,
   82                          struct ifnet *);
   83 
   84 extern  struct domain inet6domain;
   85 struct ip6protosw in6_gif_protosw = {
   86         .pr_type =      SOCK_RAW,
   87         .pr_domain =    &inet6domain,
   88         .pr_protocol =  0,                      /* IPPROTO_IPV[46] */
   89         .pr_flags =     PR_ATOMIC|PR_ADDR,
   90         .pr_input =     in6_gif_input,
   91         .pr_output =    rip6_output,
   92         .pr_ctloutput = rip6_ctloutput,
   93         .pr_usrreqs =   &rip6_usrreqs
   94 };
   95 
   96 int
   97 in6_gif_output(struct ifnet *ifp,
   98     int family,                 /* family of the packet to be encapsulate */
   99     struct mbuf *m)
  100 {
  101         struct gif_softc *sc = ifp->if_softc;
  102         struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
  103         struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
  104         struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
  105         struct ip6_hdr *ip6;
  106         struct etherip_header eiphdr;
  107         int error, len, proto;
  108         u_int8_t itos, otos;
  109 
  110         GIF_LOCK_ASSERT(sc);
  111 
  112         if (sin6_src == NULL || sin6_dst == NULL ||
  113             sin6_src->sin6_family != AF_INET6 ||
  114             sin6_dst->sin6_family != AF_INET6) {
  115                 m_freem(m);
  116                 return EAFNOSUPPORT;
  117         }
  118 
  119         switch (family) {
  120 #ifdef INET
  121         case AF_INET:
  122             {
  123                 struct ip *ip;
  124 
  125                 proto = IPPROTO_IPV4;
  126                 if (m->m_len < sizeof(*ip)) {
  127                         m = m_pullup(m, sizeof(*ip));
  128                         if (!m)
  129                                 return ENOBUFS;
  130                 }
  131                 ip = mtod(m, struct ip *);
  132                 itos = ip->ip_tos;
  133                 break;
  134             }
  135 #endif
  136 #ifdef INET6
  137         case AF_INET6:
  138             {
  139                 struct ip6_hdr *ip6;
  140                 proto = IPPROTO_IPV6;
  141                 if (m->m_len < sizeof(*ip6)) {
  142                         m = m_pullup(m, sizeof(*ip6));
  143                         if (!m)
  144                                 return ENOBUFS;
  145                 }
  146                 ip6 = mtod(m, struct ip6_hdr *);
  147                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  148                 break;
  149             }
  150 #endif
  151         case AF_LINK:
  152                 proto = IPPROTO_ETHERIP;
  153 
  154                 /*
  155                  * GIF_SEND_REVETHIP (disabled by default) intentionally
  156                  * sends an EtherIP packet with revered version field in
  157                  * the header.  This is a knob for backward compatibility
  158                  * with FreeBSD 7.2R or prior.
  159                  */
  160                 if ((sc->gif_options & GIF_SEND_REVETHIP)) {
  161                         eiphdr.eip_ver = 0;
  162                         eiphdr.eip_resvl = ETHERIP_VERSION;
  163                         eiphdr.eip_resvh = 0;
  164                 } else {
  165                         eiphdr.eip_ver = ETHERIP_VERSION;
  166                         eiphdr.eip_resvl = 0;
  167                         eiphdr.eip_resvh = 0;
  168                 }
  169                 /* prepend Ethernet-in-IP header */
  170                 M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
  171                 if (m && m->m_len < sizeof(struct etherip_header))
  172                         m = m_pullup(m, sizeof(struct etherip_header));
  173                 if (m == NULL)
  174                         return ENOBUFS;
  175                 bcopy(&eiphdr, mtod(m, struct etherip_header *),
  176                     sizeof(struct etherip_header));
  177                 break;
  178 
  179         default:
  180 #ifdef DEBUG
  181                 printf("in6_gif_output: warning: unknown family %d passed\n",
  182                         family);
  183 #endif
  184                 m_freem(m);
  185                 return EAFNOSUPPORT;
  186         }
  187 
  188         /* prepend new IP header */
  189         len = sizeof(struct ip6_hdr);
  190 #ifndef __NO_STRICT_ALIGNMENT
  191         if (family == AF_LINK)
  192                 len += ETHERIP_ALIGN;
  193 #endif
  194         M_PREPEND(m, len, M_DONTWAIT);
  195         if (m != NULL && m->m_len < len)
  196                 m = m_pullup(m, len);
  197         if (m == NULL) {
  198                 printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
  199                 return ENOBUFS;
  200         }
  201 #ifndef __NO_STRICT_ALIGNMENT
  202         if (family == AF_LINK) {
  203                 len = mtod(m, vm_offset_t) & 3;
  204                 KASSERT(len == 0 || len == ETHERIP_ALIGN,
  205                     ("in6_gif_output: unexpected misalignment"));
  206                 m->m_data += len;
  207                 m->m_len -= ETHERIP_ALIGN;
  208         }
  209 #endif
  210 
  211         ip6 = mtod(m, struct ip6_hdr *);
  212         ip6->ip6_flow   = 0;
  213         ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  214         ip6->ip6_vfc    |= IPV6_VERSION;
  215         ip6->ip6_plen   = htons((u_short)m->m_pkthdr.len);
  216         ip6->ip6_nxt    = proto;
  217         ip6->ip6_hlim   = V_ip6_gif_hlim;
  218         ip6->ip6_src    = sin6_src->sin6_addr;
  219         /* bidirectional configured tunnel mode */
  220         if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
  221                 ip6->ip6_dst = sin6_dst->sin6_addr;
  222         else  {
  223                 m_freem(m);
  224                 return ENETUNREACH;
  225         }
  226         ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
  227                        &otos, &itos);
  228         ip6->ip6_flow &= ~htonl(0xff << 20);
  229         ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
  230 
  231         if (dst->sin6_family != sin6_dst->sin6_family ||
  232              !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
  233                 /* cache route doesn't match */
  234                 bzero(dst, sizeof(*dst));
  235                 dst->sin6_family = sin6_dst->sin6_family;
  236                 dst->sin6_len = sizeof(struct sockaddr_in6);
  237                 dst->sin6_addr = sin6_dst->sin6_addr;
  238                 if (sc->gif_ro6.ro_rt) {
  239                         RTFREE(sc->gif_ro6.ro_rt);
  240                         sc->gif_ro6.ro_rt = NULL;
  241                 }
  242 #if 0
  243                 GIF2IFP(sc)->if_mtu = GIF_MTU;
  244 #endif
  245         }
  246 
  247         if (sc->gif_ro6.ro_rt == NULL) {
  248                 rtalloc((struct route *)&sc->gif_ro6);
  249                 if (sc->gif_ro6.ro_rt == NULL) {
  250                         m_freem(m);
  251                         return ENETUNREACH;
  252                 }
  253 
  254                 /* if it constitutes infinite encapsulation, punt. */
  255                 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
  256                         m_freem(m);
  257                         return ENETUNREACH;     /*XXX*/
  258                 }
  259 #if 0
  260                 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
  261                         - sizeof(struct ip6_hdr);
  262 #endif
  263         }
  264 
  265 #ifdef IPV6_MINMTU
  266         /*
  267          * force fragmentation to minimum MTU, to avoid path MTU discovery.
  268          * it is too painful to ask for resend of inner packet, to achieve
  269          * path MTU discovery for encapsulated packets.
  270          */
  271         error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL);
  272 #else
  273         error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL);
  274 #endif
  275 
  276         if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) &&
  277             sc->gif_ro6.ro_rt != NULL) {
  278                 RTFREE(sc->gif_ro6.ro_rt);
  279                 sc->gif_ro6.ro_rt = NULL;
  280         }
  281 
  282         return (error);
  283 }
  284 
  285 int
  286 in6_gif_input(struct mbuf **mp, int *offp, int proto)
  287 {
  288         struct mbuf *m = *mp;
  289         struct ifnet *gifp = NULL;
  290         struct gif_softc *sc;
  291         struct ip6_hdr *ip6;
  292         int af = 0;
  293         u_int32_t otos;
  294 
  295         ip6 = mtod(m, struct ip6_hdr *);
  296 
  297         sc = (struct gif_softc *)encap_getarg(m);
  298         if (sc == NULL) {
  299                 m_freem(m);
  300                 V_ip6stat.ip6s_nogif++;
  301                 return IPPROTO_DONE;
  302         }
  303 
  304         gifp = GIF2IFP(sc);
  305         if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
  306                 m_freem(m);
  307                 V_ip6stat.ip6s_nogif++;
  308                 return IPPROTO_DONE;
  309         }
  310 
  311         otos = ip6->ip6_flow;
  312         m_adj(m, *offp);
  313 
  314         switch (proto) {
  315 #ifdef INET
  316         case IPPROTO_IPV4:
  317             {
  318                 struct ip *ip;
  319                 u_int8_t otos8;
  320                 af = AF_INET;
  321                 otos8 = (ntohl(otos) >> 20) & 0xff;
  322                 if (m->m_len < sizeof(*ip)) {
  323                         m = m_pullup(m, sizeof(*ip));
  324                         if (!m)
  325                                 return IPPROTO_DONE;
  326                 }
  327                 ip = mtod(m, struct ip *);
  328                 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  329                                   ECN_ALLOWED : ECN_NOCARE,
  330                                   &otos8, &ip->ip_tos) == 0) {
  331                         m_freem(m);
  332                         return IPPROTO_DONE;
  333                 }
  334                 break;
  335             }
  336 #endif /* INET */
  337 #ifdef INET6
  338         case IPPROTO_IPV6:
  339             {
  340                 struct ip6_hdr *ip6;
  341                 af = AF_INET6;
  342                 if (m->m_len < sizeof(*ip6)) {
  343                         m = m_pullup(m, sizeof(*ip6));
  344                         if (!m)
  345                                 return IPPROTO_DONE;
  346                 }
  347                 ip6 = mtod(m, struct ip6_hdr *);
  348                 if (ip6_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  349                                    ECN_ALLOWED : ECN_NOCARE,
  350                                    &otos, &ip6->ip6_flow) == 0) {
  351                         m_freem(m);
  352                         return IPPROTO_DONE;
  353                 }
  354                 break;
  355             }
  356 #endif
  357         case IPPROTO_ETHERIP:
  358                 af = AF_LINK;
  359                 break;
  360 
  361         default:
  362                 V_ip6stat.ip6s_nogif++;
  363                 m_freem(m);
  364                 return IPPROTO_DONE;
  365         }
  366 
  367         gif_input(m, af, gifp);
  368         return IPPROTO_DONE;
  369 }
  370 
  371 /*
  372  * validate outer address.
  373  */
  374 static int
  375 gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc,
  376     struct ifnet *ifp)
  377 {
  378         struct sockaddr_in6 *src, *dst;
  379 
  380         src = (struct sockaddr_in6 *)sc->gif_psrc;
  381         dst = (struct sockaddr_in6 *)sc->gif_pdst;
  382 
  383         /*
  384          * Check for address match.  Note that the check is for an incoming
  385          * packet.  We should compare the *source* address in our configuration
  386          * and the *destination* address of the packet, and vice versa.
  387          */
  388         if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
  389             !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
  390                 return 0;
  391 
  392         /* martian filters on outer source - done in ip6_input */
  393 
  394         /* ingress filters on outer source */
  395         if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
  396                 struct sockaddr_in6 sin6;
  397                 struct rtentry *rt;
  398 
  399                 bzero(&sin6, sizeof(sin6));
  400                 sin6.sin6_family = AF_INET6;
  401                 sin6.sin6_len = sizeof(struct sockaddr_in6);
  402                 sin6.sin6_addr = ip6->ip6_src;
  403                 sin6.sin6_scope_id = 0; /* XXX */
  404 
  405                 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
  406                 if (!rt || rt->rt_ifp != ifp) {
  407 #if 0
  408                         char ip6buf[INET6_ADDRSTRLEN];
  409                         log(LOG_WARNING, "%s: packet from %s dropped "
  410                             "due to ingress filter\n", if_name(GIF2IFP(sc)),
  411                             ip6_sprintf(ip6buf, &sin6.sin6_addr));
  412 #endif
  413                         if (rt)
  414                                 RTFREE_LOCKED(rt);
  415                         return 0;
  416                 }
  417                 RTFREE_LOCKED(rt);
  418         }
  419 
  420         return 128 * 2;
  421 }
  422 
  423 /*
  424  * we know that we are in IFF_UP, outer address available, and outer family
  425  * matched the physical addr family.  see gif_encapcheck().
  426  * sanity check for arg should have been done in the caller.
  427  */
  428 int
  429 gif_encapcheck6(const struct mbuf *m, int off, int proto, void *arg)
  430 {
  431         struct ip6_hdr ip6;
  432         struct gif_softc *sc;
  433         struct ifnet *ifp;
  434 
  435         /* sanity check done in caller */
  436         sc = (struct gif_softc *)arg;
  437 
  438         /* LINTED const cast */
  439         m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
  440         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  441 
  442         return gif_validate6(&ip6, sc, ifp);
  443 }
  444 
  445 int
  446 in6_gif_attach(struct gif_softc *sc)
  447 {
  448         sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
  449             (void *)&in6_gif_protosw, sc);
  450         if (sc->encap_cookie6 == NULL)
  451                 return EEXIST;
  452         return 0;
  453 }
  454 
  455 int
  456 in6_gif_detach(struct gif_softc *sc)
  457 {
  458         int error;
  459 
  460         error = encap_detach(sc->encap_cookie6);
  461         if (error == 0)
  462                 sc->encap_cookie6 = NULL;
  463         return error;
  464 }

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