The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_gif.c

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    1 /*      $NetBSD: in_gif.c,v 1.41.2.1 2006/01/08 15:48:46 riz Exp $      */
    2 /*      $KAME: in_gif.c,v 1.66 2001/07/29 04:46:09 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 <sys/cdefs.h>
   34 __KERNEL_RCSID(0, "$NetBSD: in_gif.c,v 1.41.2.1 2006/01/08 15:48:46 riz Exp $");
   35 
   36 #include "opt_inet.h"
   37 #include "opt_iso.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/ioctl.h>
   46 #include <sys/syslog.h>
   47 #include <sys/protosw.h>
   48 #include <sys/kernel.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 #include <netinet/ip.h>
   56 #include <netinet/ip_var.h>
   57 #include <netinet/in_gif.h>
   58 #include <netinet/in_var.h>
   59 #include <netinet/ip_encap.h>
   60 #include <netinet/ip_ecn.h>
   61 
   62 #ifdef INET6
   63 #include <netinet/ip6.h>
   64 #endif
   65 
   66 #include <net/if_gif.h>
   67 
   68 #include "gif.h"
   69 #include "bridge.h"
   70 #include <net/if_ether.h>
   71 
   72 #include <machine/stdarg.h>
   73 
   74 #include <net/net_osdep.h>
   75 
   76 static int gif_validate4(const struct ip *, struct gif_softc *,
   77         struct ifnet *);
   78 
   79 #if NGIF > 0
   80 int ip_gif_ttl = GIF_TTL;
   81 #else
   82 int ip_gif_ttl = 0;
   83 #endif
   84 
   85 const struct protosw in_gif_protosw =
   86 { SOCK_RAW,     &inetdomain,    0/* IPPROTO_IPV[46] */, PR_ATOMIC|PR_ADDR,
   87   in_gif_input, rip_output,     0,              rip_ctloutput,
   88   rip_usrreq,
   89   0,            0,              0,              0,
   90 };
   91 
   92 int
   93 in_gif_output(struct ifnet *ifp, int family, struct mbuf *m)
   94 {
   95         struct gif_softc *sc = (struct gif_softc*)ifp;
   96         struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
   97         struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
   98         struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
   99         struct ip iphdr;        /* capsule IP header, host byte ordered */
  100 #if NBRIDGE > 0
  101         struct etherip_header eiphdr;
  102 #endif
  103         int proto, error;
  104         u_int8_t tos;
  105 
  106         if (sin_src == NULL || sin_dst == NULL ||
  107             sin_src->sin_family != AF_INET ||
  108             sin_dst->sin_family != AF_INET) {
  109                 m_freem(m);
  110                 return EAFNOSUPPORT;
  111         }
  112 
  113         switch (family) {
  114 #ifdef INET
  115         case AF_INET:
  116             {
  117                 struct ip *ip;
  118 
  119                 proto = IPPROTO_IPV4;
  120                 if (m->m_len < sizeof(*ip)) {
  121                         m = m_pullup(m, sizeof(*ip));
  122                         if (!m)
  123                                 return ENOBUFS;
  124                 }
  125                 ip = mtod(m, struct ip *);
  126                 tos = ip->ip_tos;
  127                 break;
  128             }
  129 #endif /* INET */
  130 #ifdef INET6
  131         case AF_INET6:
  132             {
  133                 struct ip6_hdr *ip6;
  134                 proto = IPPROTO_IPV6;
  135                 if (m->m_len < sizeof(*ip6)) {
  136                         m = m_pullup(m, sizeof(*ip6));
  137                         if (!m)
  138                                 return ENOBUFS;
  139                 }
  140                 ip6 = mtod(m, struct ip6_hdr *);
  141                 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  142                 break;
  143             }
  144 #endif /* INET6 */
  145 #ifdef ISO
  146         case AF_ISO:
  147                 proto = IPPROTO_EON;
  148                 tos = 0;
  149                 break;
  150 #endif
  151 #if NBRIDGE > 0
  152         case AF_LINK:
  153                 proto = IPPROTO_ETHERIP;
  154                 eiphdr.eip_ver = ETHERIP_VERSION & ETHERIP_VER_VERS_MASK;
  155                 eiphdr.eip_pad = 0;
  156                 /* prepend Ethernet-in-IP header */
  157                 M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
  158                 if (m && m->m_len < sizeof(struct etherip_header))
  159                         m = m_pullup(m, sizeof(struct etherip_header));
  160                 if (m == NULL)
  161                         return ENOBUFS;
  162                 bcopy(&eiphdr, mtod(m, struct etherip_header *), sizeof(struct etherip_header));
  163                 break;
  164 #endif
  165         default:
  166 #ifdef DEBUG
  167                 printf("in_gif_output: warning: unknown family %d passed\n",
  168                         family);
  169 #endif
  170                 m_freem(m);
  171                 return EAFNOSUPPORT;
  172         }
  173 
  174         bzero(&iphdr, sizeof(iphdr));
  175         iphdr.ip_src = sin_src->sin_addr;
  176         /* bidirectional configured tunnel mode */
  177         if (sin_dst->sin_addr.s_addr != INADDR_ANY)
  178                 iphdr.ip_dst = sin_dst->sin_addr;
  179         else {
  180                 m_freem(m);
  181                 return ENETUNREACH;
  182         }
  183         iphdr.ip_p = proto;
  184         /* version will be set in ip_output() */
  185         iphdr.ip_ttl = ip_gif_ttl;
  186         iphdr.ip_len = htons(m->m_pkthdr.len + sizeof(struct ip));
  187         if (ifp->if_flags & IFF_LINK1)
  188                 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
  189         else
  190                 ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
  191 
  192         /* prepend new IP header */
  193         M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  194         if (m && m->m_len < sizeof(struct ip))
  195                 m = m_pullup(m, sizeof(struct ip));
  196         if (m == NULL)
  197                 return ENOBUFS;
  198         bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
  199 
  200         if (sc->gif_route_expire - time.tv_sec <= 0 ||
  201             dst->sin_family != sin_dst->sin_family ||
  202             !in_hosteq(dst->sin_addr, sin_dst->sin_addr)) {
  203                 /* cache route doesn't match */
  204                 bzero(dst, sizeof(*dst));
  205                 dst->sin_family = sin_dst->sin_family;
  206                 dst->sin_len = sizeof(struct sockaddr_in);
  207                 dst->sin_addr = sin_dst->sin_addr;
  208                 if (sc->gif_ro.ro_rt) {
  209                         RTFREE(sc->gif_ro.ro_rt);
  210                         sc->gif_ro.ro_rt = NULL;
  211                 }
  212         }
  213 
  214         if (sc->gif_ro.ro_rt == NULL) {
  215                 rtalloc(&sc->gif_ro);
  216                 if (sc->gif_ro.ro_rt == NULL) {
  217                         m_freem(m);
  218                         return ENETUNREACH;
  219                 }
  220 
  221                 /* if it constitutes infinite encapsulation, punt. */
  222                 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
  223                         m_freem(m);
  224                         return ENETUNREACH;     /*XXX*/
  225                 }
  226 
  227                 sc->gif_route_expire = time.tv_sec + GIF_ROUTE_TTL;
  228         }
  229 
  230         error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
  231         return (error);
  232 }
  233 
  234 void
  235 in_gif_input(struct mbuf *m, ...)
  236 {
  237         int off, proto;
  238         struct ifnet *gifp = NULL;
  239         struct ip *ip;
  240         va_list ap;
  241         int af;
  242         u_int8_t otos;
  243 
  244         va_start(ap, m);
  245         off = va_arg(ap, int);
  246         proto = va_arg(ap, int);
  247         va_end(ap);
  248 
  249         ip = mtod(m, struct ip *);
  250 
  251         gifp = (struct ifnet *)encap_getarg(m);
  252 
  253         if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
  254                 m_freem(m);
  255                 ipstat.ips_nogif++;
  256                 return;
  257         }
  258 #ifndef GIF_ENCAPCHECK
  259         if (!gif_validate4(ip, (struct gif_softc *)gifp, m->m_pkthdr.rcvif)) {
  260                 m_freem(m);
  261                 ipstat.ips_nogif++;
  262                 return;
  263         }
  264 #endif
  265 
  266         otos = ip->ip_tos;
  267         m_adj(m, off);
  268 
  269         switch (proto) {
  270 #ifdef INET
  271         case IPPROTO_IPV4:
  272             {
  273                 struct ip *ip;
  274                 af = AF_INET;
  275                 if (m->m_len < sizeof(*ip)) {
  276                         m = m_pullup(m, sizeof(*ip));
  277                         if (!m)
  278                                 return;
  279                 }
  280                 ip = mtod(m, struct ip *);
  281                 if (gifp->if_flags & IFF_LINK1)
  282                         ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
  283                 else
  284                         ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
  285                 break;
  286             }
  287 #endif
  288 #ifdef INET6
  289         case IPPROTO_IPV6:
  290             {
  291                 struct ip6_hdr *ip6;
  292                 u_int8_t itos;
  293                 af = AF_INET6;
  294                 if (m->m_len < sizeof(*ip6)) {
  295                         m = m_pullup(m, sizeof(*ip6));
  296                         if (!m)
  297                                 return;
  298                 }
  299                 ip6 = mtod(m, struct ip6_hdr *);
  300                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  301                 if (gifp->if_flags & IFF_LINK1)
  302                         ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
  303                 else
  304                         ip_ecn_egress(ECN_NOCARE, &otos, &itos);
  305                 ip6->ip6_flow &= ~htonl(0xff << 20);
  306                 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
  307                 break;
  308             }
  309 #endif /* INET6 */
  310 #ifdef ISO
  311         case IPPROTO_EON:
  312                 af = AF_ISO;
  313                 break;
  314 #endif
  315 #if NBRIDGE > 0
  316         case IPPROTO_ETHERIP:
  317                 af = AF_LINK;
  318                 break;
  319 #endif
  320         default:
  321                 ipstat.ips_nogif++;
  322                 m_freem(m);
  323                 return;
  324         }
  325         gif_input(m, af, gifp);
  326         return;
  327 }
  328 
  329 /*
  330  * validate outer address.
  331  */
  332 static int
  333 gif_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp)
  334 {
  335         struct sockaddr_in *src, *dst;
  336         struct in_ifaddr *ia4;
  337 
  338         src = (struct sockaddr_in *)sc->gif_psrc;
  339         dst = (struct sockaddr_in *)sc->gif_pdst;
  340 
  341         /* check for address match */
  342         if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
  343             dst->sin_addr.s_addr != ip->ip_src.s_addr)
  344                 return 0;
  345 
  346         /* martian filters on outer source - NOT done in ip_input! */
  347         if (IN_MULTICAST(ip->ip_src.s_addr))
  348                 return 0;
  349         switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
  350         case 0: case 127: case 255:
  351                 return 0;
  352         }
  353         /* reject packets with broadcast on source */
  354         TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list) {
  355                 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
  356                         continue;
  357                 if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
  358                         return 0;
  359         }
  360 
  361         /* ingress filters on outer source */
  362         if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
  363                 struct sockaddr_in sin;
  364                 struct rtentry *rt;
  365 
  366                 bzero(&sin, sizeof(sin));
  367                 sin.sin_family = AF_INET;
  368                 sin.sin_len = sizeof(struct sockaddr_in);
  369                 sin.sin_addr = ip->ip_src;
  370                 rt = rtalloc1((struct sockaddr *)&sin, 0);
  371                 if (!rt || rt->rt_ifp != ifp) {
  372 #if 0
  373                         log(LOG_WARNING, "%s: packet from 0x%x dropped "
  374                             "due to ingress filter\n", if_name(&sc->gif_if),
  375                             (u_int32_t)ntohl(sin.sin_addr.s_addr));
  376 #endif
  377                         if (rt)
  378                                 rtfree(rt);
  379                         return 0;
  380                 }
  381                 rtfree(rt);
  382         }
  383 
  384         return 32 * 2;
  385 }
  386 
  387 #ifdef GIF_ENCAPCHECK
  388 /*
  389  * we know that we are in IFF_UP, outer address available, and outer family
  390  * matched the physical addr family.  see gif_encapcheck().
  391  */
  392 int
  393 gif_encapcheck4(const struct mbuf *m, int off, int proto, void *arg)
  394 {
  395         struct ip ip;
  396         struct gif_softc *sc;
  397         struct ifnet *ifp;
  398 
  399         /* sanity check done in caller */
  400         sc = (struct gif_softc *)arg;
  401 
  402         /* LINTED const cast */
  403         m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);
  404         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  405 
  406         return gif_validate4(&ip, sc, ifp);
  407 }
  408 #endif
  409 
  410 int
  411 in_gif_attach(struct gif_softc *sc)
  412 {
  413 #ifndef GIF_ENCAPCHECK
  414         struct sockaddr_in mask4;
  415 
  416         bzero(&mask4, sizeof(mask4));
  417         mask4.sin_len = sizeof(struct sockaddr_in);
  418         mask4.sin_addr.s_addr = ~0;
  419 
  420         if (!sc->gif_psrc || !sc->gif_pdst)
  421                 return EINVAL;
  422         sc->encap_cookie4 = encap_attach(AF_INET, -1, sc->gif_psrc,
  423             (struct sockaddr *)&mask4, sc->gif_pdst, (struct sockaddr *)&mask4,
  424             (struct protosw *)&in_gif_protosw, sc);
  425 #else
  426         sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
  427             &in_gif_protosw, sc);
  428 #endif
  429         if (sc->encap_cookie4 == NULL)
  430                 return EEXIST;
  431         return 0;
  432 }
  433 
  434 int
  435 in_gif_detach(struct gif_softc *sc)
  436 {
  437         int error;
  438 
  439         error = encap_detach(sc->encap_cookie4);
  440         if (error == 0)
  441                 sc->encap_cookie4 = NULL;
  442 
  443         if (sc->gif_ro.ro_rt) {
  444                 RTFREE(sc->gif_ro.ro_rt);
  445                 sc->gif_ro.ro_rt = NULL;
  446         }
  447 
  448         return error;
  449 }

Cache object: 29512de82b3a48b21c2104d4d5ea4643


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.