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("$FreeBSD$");
   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 
   48 #include <sys/malloc.h>
   49 
   50 #include <net/if.h>
   51 #include <net/route.h>
   52 
   53 #include <netinet/in.h>
   54 #include <netinet/in_systm.h>
   55 #ifdef INET
   56 #include <netinet/ip.h>
   57 #endif
   58 #include <netinet/ip_encap.h>
   59 #ifdef INET6
   60 #include <netinet/ip6.h>
   61 #include <netinet6/ip6_var.h>
   62 #include <netinet6/in6_gif.h>
   63 #include <netinet6/in6_var.h>
   64 #endif
   65 #include <netinet6/ip6protosw.h>
   66 #include <netinet/ip_ecn.h>
   67 #ifdef INET6
   68 #include <netinet6/ip6_ecn.h>
   69 #endif
   70 
   71 #include <net/if_gif.h>
   72 
   73 static int gif_validate6(const struct ip6_hdr *, struct gif_softc *,
   74                          struct ifnet *);
   75 
   76 extern  struct domain inet6domain;
   77 struct ip6protosw in6_gif_protosw = {
   78         .pr_type =      SOCK_RAW,
   79         .pr_domain =    &inet6domain,
   80         .pr_protocol =  0,                      /* IPPROTO_IPV[46] */
   81         .pr_flags =     PR_ATOMIC|PR_ADDR,
   82         .pr_input =     in6_gif_input,
   83         .pr_output =    rip6_output,
   84         .pr_ctloutput = rip6_ctloutput,
   85         .pr_usrreqs =   &rip6_usrreqs
   86 };
   87 
   88 int
   89 in6_gif_output(struct ifnet *ifp,
   90     int family,                 /* family of the packet to be encapsulate */
   91     struct mbuf *m)
   92 {
   93         struct gif_softc *sc = ifp->if_softc;
   94         struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
   95         struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
   96         struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
   97         struct ip6_hdr *ip6;
   98         struct etherip_header eiphdr;
   99         int error, len, proto;
  100         u_int8_t itos, otos;
  101 
  102         GIF_LOCK_ASSERT(sc);
  103 
  104         if (sin6_src == NULL || sin6_dst == NULL ||
  105             sin6_src->sin6_family != AF_INET6 ||
  106             sin6_dst->sin6_family != AF_INET6) {
  107                 m_freem(m);
  108                 return EAFNOSUPPORT;
  109         }
  110 
  111         switch (family) {
  112 #ifdef INET
  113         case AF_INET:
  114             {
  115                 struct ip *ip;
  116 
  117                 proto = IPPROTO_IPV4;
  118                 if (m->m_len < sizeof(*ip)) {
  119                         m = m_pullup(m, sizeof(*ip));
  120                         if (!m)
  121                                 return ENOBUFS;
  122                 }
  123                 ip = mtod(m, struct ip *);
  124                 itos = ip->ip_tos;
  125                 break;
  126             }
  127 #endif
  128 #ifdef INET6
  129         case AF_INET6:
  130             {
  131                 struct ip6_hdr *ip6;
  132                 proto = IPPROTO_IPV6;
  133                 if (m->m_len < sizeof(*ip6)) {
  134                         m = m_pullup(m, sizeof(*ip6));
  135                         if (!m)
  136                                 return ENOBUFS;
  137                 }
  138                 ip6 = mtod(m, struct ip6_hdr *);
  139                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  140                 break;
  141             }
  142 #endif
  143         case AF_LINK:
  144                 proto = IPPROTO_ETHERIP;
  145 
  146                 /*
  147                  * GIF_SEND_REVETHIP (disabled by default) intentionally
  148                  * sends an EtherIP packet with revered version field in
  149                  * the header.  This is a knob for backward compatibility
  150                  * with FreeBSD 7.2R or prior.
  151                  */
  152                 if ((sc->gif_options & GIF_SEND_REVETHIP)) {
  153                         eiphdr.eip_ver = 0;
  154                         eiphdr.eip_resvl = ETHERIP_VERSION;
  155                         eiphdr.eip_resvh = 0;
  156                 } else {
  157                         eiphdr.eip_ver = ETHERIP_VERSION;
  158                         eiphdr.eip_resvl = 0;
  159                         eiphdr.eip_resvh = 0;
  160                 }
  161                 /* prepend Ethernet-in-IP header */
  162                 M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
  163                 if (m && m->m_len < sizeof(struct etherip_header))
  164                         m = m_pullup(m, sizeof(struct etherip_header));
  165                 if (m == NULL)
  166                         return ENOBUFS;
  167                 bcopy(&eiphdr, mtod(m, struct etherip_header *),
  168                     sizeof(struct etherip_header));
  169                 break;
  170 
  171         default:
  172 #ifdef DEBUG
  173                 printf("in6_gif_output: warning: unknown family %d passed\n",
  174                         family);
  175 #endif
  176                 m_freem(m);
  177                 return EAFNOSUPPORT;
  178         }
  179 
  180         /* prepend new IP header */
  181         len = sizeof(struct ip6_hdr);
  182 #ifndef __NO_STRICT_ALIGNMENT
  183         if (family == AF_LINK)
  184                 len += ETHERIP_ALIGN;
  185 #endif
  186         M_PREPEND(m, len, M_DONTWAIT);
  187         if (m != NULL && m->m_len < len)
  188                 m = m_pullup(m, len);
  189         if (m == NULL) {
  190                 printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
  191                 return ENOBUFS;
  192         }
  193 #ifndef __NO_STRICT_ALIGNMENT
  194         if (family == AF_LINK) {
  195                 len = mtod(m, vm_offset_t) & 3;
  196                 KASSERT(len == 0 || len == ETHERIP_ALIGN,
  197                     ("in6_gif_output: unexpected misalignment"));
  198                 m->m_data += len;
  199                 m->m_len -= ETHERIP_ALIGN;
  200         }
  201 #endif
  202 
  203         ip6 = mtod(m, struct ip6_hdr *);
  204         ip6->ip6_flow   = 0;
  205         ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  206         ip6->ip6_vfc    |= IPV6_VERSION;
  207         ip6->ip6_plen   = htons((u_short)m->m_pkthdr.len);
  208         ip6->ip6_nxt    = proto;
  209         ip6->ip6_hlim   = ip6_gif_hlim;
  210         ip6->ip6_src    = sin6_src->sin6_addr;
  211         /* bidirectional configured tunnel mode */
  212         if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
  213                 ip6->ip6_dst = sin6_dst->sin6_addr;
  214         else  {
  215                 m_freem(m);
  216                 return ENETUNREACH;
  217         }
  218         ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
  219                        &otos, &itos);
  220         ip6->ip6_flow &= ~htonl(0xff << 20);
  221         ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
  222 
  223         if (dst->sin6_family != sin6_dst->sin6_family ||
  224              !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
  225                 /* cache route doesn't match */
  226                 bzero(dst, sizeof(*dst));
  227                 dst->sin6_family = sin6_dst->sin6_family;
  228                 dst->sin6_len = sizeof(struct sockaddr_in6);
  229                 dst->sin6_addr = sin6_dst->sin6_addr;
  230                 if (sc->gif_ro6.ro_rt) {
  231                         RTFREE(sc->gif_ro6.ro_rt);
  232                         sc->gif_ro6.ro_rt = NULL;
  233                 }
  234 #if 0
  235                 GIF2IFP(sc)->if_mtu = GIF_MTU;
  236 #endif
  237         }
  238 
  239         if (sc->gif_ro6.ro_rt == NULL) {
  240                 rtalloc((struct route *)&sc->gif_ro6);
  241                 if (sc->gif_ro6.ro_rt == NULL) {
  242                         m_freem(m);
  243                         return ENETUNREACH;
  244                 }
  245 
  246                 /* if it constitutes infinite encapsulation, punt. */
  247                 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
  248                         m_freem(m);
  249                         return ENETUNREACH;     /*XXX*/
  250                 }
  251 #if 0
  252                 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
  253                         - sizeof(struct ip6_hdr);
  254 #endif
  255         }
  256 
  257 #ifdef IPV6_MINMTU
  258         /*
  259          * force fragmentation to minimum MTU, to avoid path MTU discovery.
  260          * it is too painful to ask for resend of inner packet, to achieve
  261          * path MTU discovery for encapsulated packets.
  262          */
  263         error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL);
  264 #else
  265         error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL);
  266 #endif
  267 
  268         if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) &&
  269             sc->gif_ro6.ro_rt != NULL) {
  270                 RTFREE(sc->gif_ro6.ro_rt);
  271                 sc->gif_ro6.ro_rt = NULL;
  272         }
  273 
  274         return (error);
  275 }
  276 
  277 int
  278 in6_gif_input(struct mbuf **mp, int *offp, int proto)
  279 {
  280         struct mbuf *m = *mp;
  281         struct ifnet *gifp = NULL;
  282         struct gif_softc *sc;
  283         struct ip6_hdr *ip6;
  284         int af = 0;
  285         u_int32_t otos;
  286 
  287         ip6 = mtod(m, struct ip6_hdr *);
  288 
  289         sc = (struct gif_softc *)encap_getarg(m);
  290         if (sc == NULL) {
  291                 m_freem(m);
  292                 ip6stat.ip6s_nogif++;
  293                 return IPPROTO_DONE;
  294         }
  295 
  296         gifp = GIF2IFP(sc);
  297         if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
  298                 m_freem(m);
  299                 ip6stat.ip6s_nogif++;
  300                 return IPPROTO_DONE;
  301         }
  302 
  303         otos = ip6->ip6_flow;
  304         m_adj(m, *offp);
  305 
  306         switch (proto) {
  307 #ifdef INET
  308         case IPPROTO_IPV4:
  309             {
  310                 struct ip *ip;
  311                 u_int8_t otos8;
  312                 af = AF_INET;
  313                 otos8 = (ntohl(otos) >> 20) & 0xff;
  314                 if (m->m_len < sizeof(*ip)) {
  315                         m = m_pullup(m, sizeof(*ip));
  316                         if (!m)
  317                                 return IPPROTO_DONE;
  318                 }
  319                 ip = mtod(m, struct ip *);
  320                 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  321                                   ECN_ALLOWED : ECN_NOCARE,
  322                                   &otos8, &ip->ip_tos) == 0) {
  323                         m_freem(m);
  324                         return IPPROTO_DONE;
  325                 }
  326                 break;
  327             }
  328 #endif /* INET */
  329 #ifdef INET6
  330         case IPPROTO_IPV6:
  331             {
  332                 struct ip6_hdr *ip6;
  333                 af = AF_INET6;
  334                 if (m->m_len < sizeof(*ip6)) {
  335                         m = m_pullup(m, sizeof(*ip6));
  336                         if (!m)
  337                                 return IPPROTO_DONE;
  338                 }
  339                 ip6 = mtod(m, struct ip6_hdr *);
  340                 if (ip6_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  341                                    ECN_ALLOWED : ECN_NOCARE,
  342                                    &otos, &ip6->ip6_flow) == 0) {
  343                         m_freem(m);
  344                         return IPPROTO_DONE;
  345                 }
  346                 break;
  347             }
  348 #endif
  349         case IPPROTO_ETHERIP:
  350                 af = AF_LINK;
  351                 break;
  352 
  353         default:
  354                 ip6stat.ip6s_nogif++;
  355                 m_freem(m);
  356                 return IPPROTO_DONE;
  357         }
  358 
  359         gif_input(m, af, gifp);
  360         return IPPROTO_DONE;
  361 }
  362 
  363 /*
  364  * validate outer address.
  365  */
  366 static int
  367 gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc,
  368     struct ifnet *ifp)
  369 {
  370         struct sockaddr_in6 *src, *dst;
  371 
  372         src = (struct sockaddr_in6 *)sc->gif_psrc;
  373         dst = (struct sockaddr_in6 *)sc->gif_pdst;
  374 
  375         /*
  376          * Check for address match.  Note that the check is for an incoming
  377          * packet.  We should compare the *source* address in our configuration
  378          * and the *destination* address of the packet, and vice versa.
  379          */
  380         if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
  381             !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
  382                 return 0;
  383 
  384         /* martian filters on outer source - done in ip6_input */
  385 
  386         /* ingress filters on outer source */
  387         if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
  388                 struct sockaddr_in6 sin6;
  389                 struct rtentry *rt;
  390 
  391                 bzero(&sin6, sizeof(sin6));
  392                 sin6.sin6_family = AF_INET6;
  393                 sin6.sin6_len = sizeof(struct sockaddr_in6);
  394                 sin6.sin6_addr = ip6->ip6_src;
  395                 sin6.sin6_scope_id = 0; /* XXX */
  396 
  397                 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
  398                 if (!rt || rt->rt_ifp != ifp) {
  399 #if 0
  400                         char ip6buf[INET6_ADDRSTRLEN];
  401                         log(LOG_WARNING, "%s: packet from %s dropped "
  402                             "due to ingress filter\n", if_name(GIF2IFP(sc)),
  403                             ip6_sprintf(ip6buf, &sin6.sin6_addr));
  404 #endif
  405                         if (rt)
  406                                 RTFREE_LOCKED(rt);
  407                         return 0;
  408                 }
  409                 RTFREE_LOCKED(rt);
  410         }
  411 
  412         return 128 * 2;
  413 }
  414 
  415 /*
  416  * we know that we are in IFF_UP, outer address available, and outer family
  417  * matched the physical addr family.  see gif_encapcheck().
  418  * sanity check for arg should have been done in the caller.
  419  */
  420 int
  421 gif_encapcheck6(const struct mbuf *m, int off, int proto, void *arg)
  422 {
  423         struct ip6_hdr ip6;
  424         struct gif_softc *sc;
  425         struct ifnet *ifp;
  426 
  427         /* sanity check done in caller */
  428         sc = (struct gif_softc *)arg;
  429 
  430         /* LINTED const cast */
  431         m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
  432         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  433 
  434         return gif_validate6(&ip6, sc, ifp);
  435 }
  436 
  437 int
  438 in6_gif_attach(struct gif_softc *sc)
  439 {
  440         sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
  441             (void *)&in6_gif_protosw, sc);
  442         if (sc->encap_cookie6 == NULL)
  443                 return EEXIST;
  444         return 0;
  445 }
  446 
  447 int
  448 in6_gif_detach(struct gif_softc *sc)
  449 {
  450         int error;
  451 
  452         error = encap_detach(sc->encap_cookie6);
  453         if (error == 0)
  454                 sc->encap_cookie6 = NULL;
  455         return error;
  456 }

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