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/netinet/in_gif.c

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    1 /*      $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $ */
    2 
    3 /*-
    4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the project nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/9.0/sys/netinet/in_gif.c 223637 2011-06-28 11:57:25Z bz $");
   34 
   35 #include "opt_mrouting.h"
   36 #include "opt_inet.h"
   37 #include "opt_inet6.h"
   38 
   39 #include <sys/param.h>
   40 #include <sys/systm.h>
   41 #include <sys/socket.h>
   42 #include <sys/sockio.h>
   43 #include <sys/mbuf.h>
   44 #include <sys/errno.h>
   45 #include <sys/kernel.h>
   46 #include <sys/sysctl.h>
   47 #include <sys/protosw.h>
   48 #include <sys/malloc.h>
   49 
   50 #include <net/if.h>
   51 #include <net/route.h>
   52 #include <net/vnet.h>
   53 
   54 #include <netinet/in.h>
   55 #include <netinet/in_systm.h>
   56 #include <netinet/ip.h>
   57 #include <netinet/ip_var.h>
   58 #include <netinet/in_gif.h>
   59 #include <netinet/in_var.h>
   60 #include <netinet/ip_encap.h>
   61 #include <netinet/ip_ecn.h>
   62 
   63 #ifdef INET6
   64 #include <netinet/ip6.h>
   65 #endif
   66 
   67 #ifdef MROUTING
   68 #include <netinet/ip_mroute.h>
   69 #endif /* MROUTING */
   70 
   71 #include <net/if_gif.h> 
   72 
   73 static int gif_validate4(const struct ip *, struct gif_softc *,
   74         struct ifnet *);
   75 
   76 extern  struct domain inetdomain;
   77 struct protosw in_gif_protosw = {
   78         .pr_type =              SOCK_RAW,
   79         .pr_domain =            &inetdomain,
   80         .pr_protocol =          0/* IPPROTO_IPV[46] */,
   81         .pr_flags =             PR_ATOMIC|PR_ADDR,
   82         .pr_input =             in_gif_input,
   83         .pr_output =            (pr_output_t*)rip_output,
   84         .pr_ctloutput =         rip_ctloutput,
   85         .pr_usrreqs =           &rip_usrreqs
   86 };
   87 
   88 VNET_DEFINE(int, ip_gif_ttl) = GIF_TTL;
   89 #define V_ip_gif_ttl            VNET(ip_gif_ttl)
   90 SYSCTL_VNET_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
   91         &VNET_NAME(ip_gif_ttl), 0, "");
   92 
   93 int
   94 in_gif_output(struct ifnet *ifp, int family, struct mbuf *m)
   95 {
   96         struct gif_softc *sc = ifp->if_softc;
   97         struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
   98         struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
   99         struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
  100         struct ip iphdr;        /* capsule IP header, host byte ordered */
  101         struct etherip_header eiphdr;
  102         int error, len, proto;
  103         u_int8_t tos;
  104 
  105         GIF_LOCK_ASSERT(sc);
  106 
  107         if (sin_src == NULL || sin_dst == NULL ||
  108             sin_src->sin_family != AF_INET ||
  109             sin_dst->sin_family != AF_INET) {
  110                 m_freem(m);
  111                 return EAFNOSUPPORT;
  112         }
  113 
  114         switch (family) {
  115 #ifdef INET
  116         case AF_INET:
  117             {
  118                 struct ip *ip;
  119 
  120                 proto = IPPROTO_IPV4;
  121                 if (m->m_len < sizeof(*ip)) {
  122                         m = m_pullup(m, sizeof(*ip));
  123                         if (!m)
  124                                 return ENOBUFS;
  125                 }
  126                 ip = mtod(m, struct ip *);
  127                 tos = ip->ip_tos;
  128                 break;
  129             }
  130 #endif /* INET */
  131 #ifdef INET6
  132         case AF_INET6:
  133             {
  134                 struct ip6_hdr *ip6;
  135                 proto = IPPROTO_IPV6;
  136                 if (m->m_len < sizeof(*ip6)) {
  137                         m = m_pullup(m, sizeof(*ip6));
  138                         if (!m)
  139                                 return ENOBUFS;
  140                 }
  141                 ip6 = mtod(m, struct ip6_hdr *);
  142                 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  143                 break;
  144             }
  145 #endif /* INET6 */
  146         case AF_LINK:
  147                 proto = IPPROTO_ETHERIP;
  148 
  149                 /*
  150                  * GIF_SEND_REVETHIP (disabled by default) intentionally
  151                  * sends an EtherIP packet with revered version field in
  152                  * the header.  This is a knob for backward compatibility
  153                  * with FreeBSD 7.2R or prior.
  154                  */
  155                 if ((sc->gif_options & GIF_SEND_REVETHIP)) {
  156                         eiphdr.eip_ver = 0;
  157                         eiphdr.eip_resvl = ETHERIP_VERSION;
  158                         eiphdr.eip_resvh = 0;
  159                 } else {
  160                         eiphdr.eip_ver = ETHERIP_VERSION;
  161                         eiphdr.eip_resvl = 0;
  162                         eiphdr.eip_resvh = 0;
  163                 }
  164                 /* prepend Ethernet-in-IP header */
  165                 M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
  166                 if (m && m->m_len < sizeof(struct etherip_header))
  167                         m = m_pullup(m, sizeof(struct etherip_header));
  168                 if (m == NULL)
  169                         return ENOBUFS;
  170                 bcopy(&eiphdr, mtod(m, struct etherip_header *),
  171                     sizeof(struct etherip_header));
  172                 break;
  173 
  174         default:
  175 #ifdef DEBUG
  176                 printf("in_gif_output: warning: unknown family %d passed\n",
  177                         family);
  178 #endif
  179                 m_freem(m);
  180                 return EAFNOSUPPORT;
  181         }
  182 
  183         bzero(&iphdr, sizeof(iphdr));
  184         iphdr.ip_src = sin_src->sin_addr;
  185         /* bidirectional configured tunnel mode */
  186         if (sin_dst->sin_addr.s_addr != INADDR_ANY)
  187                 iphdr.ip_dst = sin_dst->sin_addr;
  188         else {
  189                 m_freem(m);
  190                 return ENETUNREACH;
  191         }
  192         iphdr.ip_p = proto;
  193         /* version will be set in ip_output() */
  194         iphdr.ip_ttl = V_ip_gif_ttl;
  195         iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
  196         ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
  197                        &iphdr.ip_tos, &tos);
  198 
  199         /* prepend new IP header */
  200         len = sizeof(struct ip);
  201 #ifndef __NO_STRICT_ALIGNMENT
  202         if (family == AF_LINK)
  203                 len += ETHERIP_ALIGN;
  204 #endif
  205         M_PREPEND(m, len, M_DONTWAIT);
  206         if (m != NULL && m->m_len < len)
  207                 m = m_pullup(m, len);
  208         if (m == NULL) {
  209                 printf("ENOBUFS in in_gif_output %d\n", __LINE__);
  210                 return ENOBUFS;
  211         }
  212 #ifndef __NO_STRICT_ALIGNMENT
  213         if (family == AF_LINK) {
  214                 len = mtod(m, vm_offset_t) & 3;
  215                 KASSERT(len == 0 || len == ETHERIP_ALIGN,
  216                     ("in_gif_output: unexpected misalignment"));
  217                 m->m_data += len;
  218                 m->m_len -= ETHERIP_ALIGN;
  219         }
  220 #endif
  221         bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
  222 
  223         M_SETFIB(m, sc->gif_fibnum);
  224 
  225         if (dst->sin_family != sin_dst->sin_family ||
  226             dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
  227                 /* cache route doesn't match */
  228                 bzero(dst, sizeof(*dst));
  229                 dst->sin_family = sin_dst->sin_family;
  230                 dst->sin_len = sizeof(struct sockaddr_in);
  231                 dst->sin_addr = sin_dst->sin_addr;
  232                 if (sc->gif_ro.ro_rt) {
  233                         RTFREE(sc->gif_ro.ro_rt);
  234                         sc->gif_ro.ro_rt = NULL;
  235                 }
  236 #if 0
  237                 GIF2IFP(sc)->if_mtu = GIF_MTU;
  238 #endif
  239         }
  240 
  241         if (sc->gif_ro.ro_rt == NULL) {
  242                 in_rtalloc_ign(&sc->gif_ro, 0, sc->gif_fibnum);
  243                 if (sc->gif_ro.ro_rt == NULL) {
  244                         m_freem(m);
  245                         return ENETUNREACH;
  246                 }
  247 
  248                 /* if it constitutes infinite encapsulation, punt. */
  249                 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
  250                         m_freem(m);
  251                         return ENETUNREACH;     /* XXX */
  252                 }
  253 #if 0
  254                 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
  255                         - sizeof(struct ip);
  256 #endif
  257         }
  258 
  259         m_addr_changed(m);
  260 
  261         error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
  262 
  263         if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) &&
  264             sc->gif_ro.ro_rt != NULL) {
  265                 RTFREE(sc->gif_ro.ro_rt);
  266                 sc->gif_ro.ro_rt = NULL;
  267         }
  268 
  269         return (error);
  270 }
  271 
  272 void
  273 in_gif_input(struct mbuf *m, int off)
  274 {
  275         struct ifnet *gifp = NULL;
  276         struct gif_softc *sc;
  277         struct ip *ip;
  278         int af;
  279         u_int8_t otos;
  280         int proto;
  281 
  282         ip = mtod(m, struct ip *);
  283         proto = ip->ip_p;
  284 
  285         sc = (struct gif_softc *)encap_getarg(m);
  286         if (sc == NULL) {
  287                 m_freem(m);
  288                 KMOD_IPSTAT_INC(ips_nogif);
  289                 return;
  290         }
  291 
  292         gifp = GIF2IFP(sc);
  293         if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
  294                 m_freem(m);
  295                 KMOD_IPSTAT_INC(ips_nogif);
  296                 return;
  297         }
  298 
  299         otos = ip->ip_tos;
  300         m_adj(m, off);
  301 
  302         switch (proto) {
  303 #ifdef INET
  304         case IPPROTO_IPV4:
  305             {
  306                 struct ip *ip;
  307                 af = AF_INET;
  308                 if (m->m_len < sizeof(*ip)) {
  309                         m = m_pullup(m, sizeof(*ip));
  310                         if (!m)
  311                                 return;
  312                 }
  313                 ip = mtod(m, struct ip *);
  314                 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  315                                   ECN_ALLOWED : ECN_NOCARE,
  316                                   &otos, &ip->ip_tos) == 0) {
  317                         m_freem(m);
  318                         return;
  319                 }
  320                 break;
  321             }
  322 #endif
  323 #ifdef INET6
  324         case IPPROTO_IPV6:
  325             {
  326                 struct ip6_hdr *ip6;
  327                 u_int8_t itos, oitos;
  328 
  329                 af = AF_INET6;
  330                 if (m->m_len < sizeof(*ip6)) {
  331                         m = m_pullup(m, sizeof(*ip6));
  332                         if (!m)
  333                                 return;
  334                 }
  335                 ip6 = mtod(m, struct ip6_hdr *);
  336                 itos = oitos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  337                 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  338                                   ECN_ALLOWED : ECN_NOCARE,
  339                                   &otos, &itos) == 0) {
  340                         m_freem(m);
  341                         return;
  342                 }
  343                 if (itos != oitos) {
  344                         ip6->ip6_flow &= ~htonl(0xff << 20);
  345                         ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
  346                 }
  347                 break;
  348             }
  349 #endif /* INET6 */
  350         case IPPROTO_ETHERIP:
  351                 af = AF_LINK;
  352                 break;  
  353 
  354         default:
  355                 KMOD_IPSTAT_INC(ips_nogif);
  356                 m_freem(m);
  357                 return;
  358         }
  359         gif_input(m, af, gifp);
  360         return;
  361 }
  362 
  363 /*
  364  * validate outer address.
  365  */
  366 static int
  367 gif_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp)
  368 {
  369         struct sockaddr_in *src, *dst;
  370         struct in_ifaddr *ia4;
  371 
  372         src = (struct sockaddr_in *)sc->gif_psrc;
  373         dst = (struct sockaddr_in *)sc->gif_pdst;
  374 
  375         /* check for address match */
  376         if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
  377             dst->sin_addr.s_addr != ip->ip_src.s_addr)
  378                 return 0;
  379 
  380         /* martian filters on outer source - NOT done in ip_input! */
  381         if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)))
  382                 return 0;
  383         switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
  384         case 0: case 127: case 255:
  385                 return 0;
  386         }
  387 
  388         /* reject packets with broadcast on source */
  389         /* XXXRW: should use hash lists? */
  390         IN_IFADDR_RLOCK();
  391         TAILQ_FOREACH(ia4, &V_in_ifaddrhead, ia_link) {
  392                 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
  393                         continue;
  394                 if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
  395                         IN_IFADDR_RUNLOCK();
  396                         return 0;
  397                 }
  398         }
  399         IN_IFADDR_RUNLOCK();
  400 
  401         /* ingress filters on outer source */
  402         if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
  403                 struct sockaddr_in sin;
  404                 struct rtentry *rt;
  405 
  406                 bzero(&sin, sizeof(sin));
  407                 sin.sin_family = AF_INET;
  408                 sin.sin_len = sizeof(struct sockaddr_in);
  409                 sin.sin_addr = ip->ip_src;
  410                 /* XXX MRT  check for the interface we would use on output */
  411                 rt = in_rtalloc1((struct sockaddr *)&sin, 0,
  412                     0UL, sc->gif_fibnum);
  413                 if (!rt || rt->rt_ifp != ifp) {
  414 #if 0
  415                         log(LOG_WARNING, "%s: packet from 0x%x dropped "
  416                             "due to ingress filter\n", if_name(GIF2IFP(sc)),
  417                             (u_int32_t)ntohl(sin.sin_addr.s_addr));
  418 #endif
  419                         if (rt)
  420                                 RTFREE_LOCKED(rt);
  421                         return 0;
  422                 }
  423                 RTFREE_LOCKED(rt);
  424         }
  425 
  426         return 32 * 2;
  427 }
  428 
  429 /*
  430  * we know that we are in IFF_UP, outer address available, and outer family
  431  * matched the physical addr family.  see gif_encapcheck().
  432  */
  433 int
  434 gif_encapcheck4(const struct mbuf *m, int off, int proto, void *arg)
  435 {
  436         struct ip ip;
  437         struct gif_softc *sc;
  438         struct ifnet *ifp;
  439 
  440         /* sanity check done in caller */
  441         sc = (struct gif_softc *)arg;
  442 
  443         /* LINTED const cast */
  444         m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
  445         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  446 
  447         return gif_validate4(&ip, sc, ifp);
  448 }
  449 
  450 int
  451 in_gif_attach(struct gif_softc *sc)
  452 {
  453         sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
  454             &in_gif_protosw, sc);
  455         if (sc->encap_cookie4 == NULL)
  456                 return EEXIST;
  457         return 0;
  458 }
  459 
  460 int
  461 in_gif_detach(struct gif_softc *sc)
  462 {
  463         int error;
  464 
  465         error = encap_detach(sc->encap_cookie4);
  466         if (error == 0)
  467                 sc->encap_cookie4 = NULL;
  468         return error;
  469 }

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