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 /*      $NetBSD: in_gif.c,v 1.59 2008/04/12 05:58:22 thorpej 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 1.59 2008/04/12 05:58:22 thorpej 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 
   70 #include <machine/stdarg.h>
   71 
   72 #include <net/net_osdep.h>
   73 
   74 static int gif_validate4(const struct ip *, struct gif_softc *,
   75         struct ifnet *);
   76 
   77 #if NGIF > 0
   78 int ip_gif_ttl = GIF_TTL;
   79 #else
   80 int ip_gif_ttl = 0;
   81 #endif
   82 
   83 const struct protosw in_gif_protosw =
   84 { SOCK_RAW,     &inetdomain,    0/* IPPROTO_IPV[46] */, PR_ATOMIC|PR_ADDR,
   85   in_gif_input, rip_output,     0,              rip_ctloutput,
   86   rip_usrreq,
   87   0,            0,              0,              0,
   88 };
   89 
   90 int
   91 in_gif_output(struct ifnet *ifp, int family, struct mbuf *m)
   92 {
   93         struct rtentry *rt;
   94         struct gif_softc *sc = (struct gif_softc*)ifp;
   95         struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
   96         struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
   97         struct ip iphdr;        /* capsule IP header, host byte ordered */
   98         int proto, error;
   99         u_int8_t tos;
  100         union {
  101                 struct sockaddr         dst;
  102                 struct sockaddr_in      dst4;
  103         } u;
  104 
  105         if (sin_src == NULL || sin_dst == NULL ||
  106             sin_src->sin_family != AF_INET ||
  107             sin_dst->sin_family != AF_INET) {
  108                 m_freem(m);
  109                 return EAFNOSUPPORT;
  110         }
  111 
  112         switch (family) {
  113 #ifdef INET
  114         case AF_INET:
  115             {
  116                 const struct ip *ip;
  117 
  118                 proto = IPPROTO_IPV4;
  119                 if (m->m_len < sizeof(*ip)) {
  120                         m = m_pullup(m, sizeof(*ip));
  121                         if (m == NULL)
  122                                 return ENOBUFS;
  123                 }
  124                 ip = mtod(m, const struct ip *);
  125                 tos = ip->ip_tos;
  126                 break;
  127             }
  128 #endif /* INET */
  129 #ifdef INET6
  130         case AF_INET6:
  131             {
  132                 const struct ip6_hdr *ip6;
  133                 proto = IPPROTO_IPV6;
  134                 if (m->m_len < sizeof(*ip6)) {
  135                         m = m_pullup(m, sizeof(*ip6));
  136                         if (!m)
  137                                 return ENOBUFS;
  138                 }
  139                 ip6 = mtod(m, const struct ip6_hdr *);
  140                 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  141                 break;
  142             }
  143 #endif /* INET6 */
  144 #ifdef ISO
  145         case AF_ISO:
  146                 proto = IPPROTO_EON;
  147                 tos = 0;
  148                 break;
  149 #endif
  150         default:
  151 #ifdef DEBUG
  152                 printf("in_gif_output: warning: unknown family %d passed\n",
  153                         family);
  154 #endif
  155                 m_freem(m);
  156                 return EAFNOSUPPORT;
  157         }
  158 
  159         bzero(&iphdr, sizeof(iphdr));
  160         iphdr.ip_src = sin_src->sin_addr;
  161         /* bidirectional configured tunnel mode */
  162         if (sin_dst->sin_addr.s_addr != INADDR_ANY)
  163                 iphdr.ip_dst = sin_dst->sin_addr;
  164         else {
  165                 m_freem(m);
  166                 return ENETUNREACH;
  167         }
  168         iphdr.ip_p = proto;
  169         /* version will be set in ip_output() */
  170         iphdr.ip_ttl = ip_gif_ttl;
  171         iphdr.ip_len = htons(m->m_pkthdr.len + sizeof(struct ip));
  172         if (ifp->if_flags & IFF_LINK1)
  173                 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
  174         else
  175                 ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
  176 
  177         /* prepend new IP header */
  178         M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  179         /* XXX Is m_pullup really necessary after M_PREPEND? */
  180         if (m != NULL && M_UNWRITABLE(m, sizeof(struct ip)))
  181                 m = m_pullup(m, sizeof(struct ip));
  182         if (m == NULL)
  183                 return ENOBUFS;
  184         bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
  185 
  186         sockaddr_in_init(&u.dst4, &sin_dst->sin_addr, 0);
  187         if ((rt = rtcache_lookup(&sc->gif_ro, &u.dst)) == NULL) {
  188                 m_freem(m);
  189                 return ENETUNREACH;
  190         }
  191 
  192         /* If the route constitutes infinite encapsulation, punt. */
  193         if (rt->rt_ifp == ifp) {
  194                 rtcache_free(&sc->gif_ro);
  195                 m_freem(m);
  196                 return ENETUNREACH;     /*XXX*/
  197         }
  198 
  199         error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
  200         return (error);
  201 }
  202 
  203 void
  204 in_gif_input(struct mbuf *m, ...)
  205 {
  206         int off, proto;
  207         struct ifnet *gifp = NULL;
  208         const struct ip *ip;
  209         va_list ap;
  210         int af;
  211         u_int8_t otos;
  212 
  213         va_start(ap, m);
  214         off = va_arg(ap, int);
  215         proto = va_arg(ap, int);
  216         va_end(ap);
  217 
  218         ip = mtod(m, const struct ip *);
  219 
  220         gifp = (struct ifnet *)encap_getarg(m);
  221 
  222         if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
  223                 m_freem(m);
  224                 ip_statinc(IP_STAT_NOGIF);
  225                 return;
  226         }
  227 #ifndef GIF_ENCAPCHECK
  228         if (!gif_validate4(ip, (struct gif_softc *)gifp, m->m_pkthdr.rcvif)) {
  229                 m_freem(m);
  230                 ip_statinc(IP_STAT_NOGIF);
  231                 return;
  232         }
  233 #endif
  234 
  235         otos = ip->ip_tos;
  236         m_adj(m, off);
  237 
  238         switch (proto) {
  239 #ifdef INET
  240         case IPPROTO_IPV4:
  241             {
  242                 struct ip *xip;
  243                 af = AF_INET;
  244                 if (M_UNWRITABLE(m, sizeof(*xip))) {
  245                         if ((m = m_pullup(m, sizeof(*xip))) == NULL)
  246                                 return;
  247                 }
  248                 xip = mtod(m, struct ip *);
  249                 if (gifp->if_flags & IFF_LINK1)
  250                         ip_ecn_egress(ECN_ALLOWED, &otos, &xip->ip_tos);
  251                 else
  252                         ip_ecn_egress(ECN_NOCARE, &otos, &xip->ip_tos);
  253                 break;
  254             }
  255 #endif
  256 #ifdef INET6
  257         case IPPROTO_IPV6:
  258             {
  259                 struct ip6_hdr *ip6;
  260                 u_int8_t itos;
  261                 af = AF_INET6;
  262                 if (M_UNWRITABLE(m, sizeof(*ip6))) {
  263                         if ((m = m_pullup(m, sizeof(*ip6))) == NULL)
  264                                 return;
  265                 }
  266                 ip6 = mtod(m, struct ip6_hdr *);
  267                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  268                 if (gifp->if_flags & IFF_LINK1)
  269                         ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
  270                 else
  271                         ip_ecn_egress(ECN_NOCARE, &otos, &itos);
  272                 ip6->ip6_flow &= ~htonl(0xff << 20);
  273                 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
  274                 break;
  275             }
  276 #endif /* INET6 */
  277 #ifdef ISO
  278         case IPPROTO_EON:
  279                 af = AF_ISO;
  280                 break;
  281 #endif
  282         default:
  283                 ip_statinc(IP_STAT_NOGIF);
  284                 m_freem(m);
  285                 return;
  286         }
  287         gif_input(m, af, gifp);
  288         return;
  289 }
  290 
  291 /*
  292  * validate outer address.
  293  */
  294 static int
  295 gif_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp)
  296 {
  297         struct sockaddr_in *src, *dst;
  298         struct in_ifaddr *ia4;
  299 
  300         src = (struct sockaddr_in *)sc->gif_psrc;
  301         dst = (struct sockaddr_in *)sc->gif_pdst;
  302 
  303         /* check for address match */
  304         if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
  305             dst->sin_addr.s_addr != ip->ip_src.s_addr)
  306                 return 0;
  307 
  308         /* martian filters on outer source - NOT done in ip_input! */
  309         if (IN_MULTICAST(ip->ip_src.s_addr))
  310                 return 0;
  311         switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
  312         case 0: case 127: case 255:
  313                 return 0;
  314         }
  315         /* reject packets with broadcast on source */
  316         TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list) {
  317                 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
  318                         continue;
  319                 if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
  320                         return 0;
  321         }
  322 
  323         /* ingress filters on outer source */
  324         if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
  325                 struct sockaddr_in sin;
  326                 struct rtentry *rt;
  327 
  328                 bzero(&sin, sizeof(sin));
  329                 sin.sin_family = AF_INET;
  330                 sin.sin_len = sizeof(struct sockaddr_in);
  331                 sin.sin_addr = ip->ip_src;
  332                 rt = rtalloc1((struct sockaddr *)&sin, 0);
  333                 if (!rt || rt->rt_ifp != ifp) {
  334 #if 0
  335                         log(LOG_WARNING, "%s: packet from 0x%x dropped "
  336                             "due to ingress filter\n", if_name(&sc->gif_if),
  337                             (u_int32_t)ntohl(sin.sin_addr.s_addr));
  338 #endif
  339                         if (rt)
  340                                 rtfree(rt);
  341                         return 0;
  342                 }
  343                 rtfree(rt);
  344         }
  345 
  346         return 32 * 2;
  347 }
  348 
  349 #ifdef GIF_ENCAPCHECK
  350 /*
  351  * we know that we are in IFF_UP, outer address available, and outer family
  352  * matched the physical addr family.  see gif_encapcheck().
  353  */
  354 int
  355 gif_encapcheck4(struct mbuf *m, int off, int proto, void *arg)
  356 {
  357         struct ip ip;
  358         struct gif_softc *sc;
  359         struct ifnet *ifp;
  360 
  361         /* sanity check done in caller */
  362         sc = (struct gif_softc *)arg;
  363 
  364         m_copydata(m, 0, sizeof(ip), (void *)&ip);
  365         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  366 
  367         return gif_validate4(&ip, sc, ifp);
  368 }
  369 #endif
  370 
  371 int
  372 in_gif_attach(struct gif_softc *sc)
  373 {
  374 #ifndef GIF_ENCAPCHECK
  375         struct sockaddr_in mask4;
  376 
  377         bzero(&mask4, sizeof(mask4));
  378         mask4.sin_len = sizeof(struct sockaddr_in);
  379         mask4.sin_addr.s_addr = ~0;
  380 
  381         if (!sc->gif_psrc || !sc->gif_pdst)
  382                 return EINVAL;
  383         sc->encap_cookie4 = encap_attach(AF_INET, -1, sc->gif_psrc,
  384             (struct sockaddr *)&mask4, sc->gif_pdst, (struct sockaddr *)&mask4,
  385             (const struct protosw *)&in_gif_protosw, sc);
  386 #else
  387         sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
  388             &in_gif_protosw, sc);
  389 #endif
  390         if (sc->encap_cookie4 == NULL)
  391                 return EEXIST;
  392         return 0;
  393 }
  394 
  395 int
  396 in_gif_detach(struct gif_softc *sc)
  397 {
  398         int error;
  399 
  400         error = encap_detach(sc->encap_cookie4);
  401         if (error == 0)
  402                 sc->encap_cookie4 = NULL;
  403 
  404         rtcache_free(&sc->gif_ro);
  405 
  406         return error;
  407 }

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