ip_gre.c

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    1 /*      $NetBSD: ip_gre.c,v 1.21 2002/08/14 00:23:30 itojun Exp $ */
    2 /*       $FreeBSD$ */
    3 
    4 /*
    5  * Copyright (c) 1998 The NetBSD Foundation, Inc.
    6  * All rights reserved.
    7  *
    8  * This code is derived from software contributed to The NetBSD Foundation
    9  * by Heiko W.Rupp <hwr@pilhuhn.de>
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. All advertising materials mentioning features or use of this software
   20  *    must display the following acknowledgement:
   21  *        This product includes software developed by the NetBSD
   22  *        Foundation, Inc. and its contributors.
   23  * 4. Neither the name of The NetBSD Foundation nor the names of its
   24  *    contributors may be used to endorse or promote products derived
   25  *    from this software without specific prior written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   37  * POSSIBILITY OF SUCH DAMAGE.
   38  */
   39 
   40 /*
   41  * deencapsulate tunneled packets and send them on
   42  * output half is in net/if_gre.[ch]
   43  * This currently handles IPPROTO_GRE, IPPROTO_MOBILE
   44  */
   45 
   46 #include "opt_inet.h"
   47 #include "opt_ns.h"
   48 #include "opt_atalk.h"
   49 
   50 #include <sys/param.h>
   51 #include <sys/systm.h>
   52 #include <sys/mbuf.h>
   53 #include <sys/socket.h>
   54 #include <sys/socketvar.h>
   55 #include <sys/protosw.h>
   56 #include <sys/errno.h>
   57 #include <sys/time.h>
   58 #include <sys/kernel.h>
   59 #include <sys/syslog.h>
   60 #include <net/bpf.h>
   61 #include <net/ethernet.h>
   62 #include <net/if.h>
   63 #include <net/netisr.h>
   64 #include <net/route.h>
   65 #include <net/raw_cb.h>
   66 
   67 #ifdef INET
   68 #include <netinet/in.h>
   69 #include <netinet/in_var.h>
   70 #include <netinet/in_systm.h>
   71 #include <netinet/ip.h>
   72 #include <netinet/ip_var.h>
   73 #include <netinet/ip_gre.h>
   74 #include <machine/in_cksum.h>
   75 #else
   76 #error ip_gre input without IP?
   77 #endif
   78 
   79 #ifdef NS
   80 #include <netns/ns.h>
   81 #include <netns/ns_if.h>
   82 #endif
   83 
   84 #ifdef NETATALK
   85 #include <netatalk/at.h>
   86 #include <netatalk/at_var.h>
   87 #include <netatalk/at_extern.h>
   88 #endif
   89 
   90 /* Needs IP headers. */
   91 #include <net/if_gre.h>
   92 
   93 #include <machine/stdarg.h>
   94 
   95 #if 1
   96 void gre_inet_ntoa(struct in_addr in);  /* XXX */
   97 #endif
   98 
   99 static struct gre_softc *gre_lookup(struct mbuf *, u_int8_t);
  100 
  101 static int      gre_input2(struct mbuf *, int, u_char);
  102 
  103 /*
  104  * De-encapsulate a packet and feed it back through ip input (this
  105  * routine is called whenever IP gets a packet with proto type
  106  * IPPROTO_GRE and a local destination address).
  107  * This really is simple
  108  */
  109 void
  110 #if __STDC__
  111 gre_input(struct mbuf *m, ...)
  112 #else
  113 gre_input(m, va_alist)
  114         struct mbuf *m;
  115         va_dcl
  116 #endif
  117 {
  118         int off, ret, proto;
  119         va_list ap;
  120 
  121         va_start(ap, m);
  122         off = va_arg(ap, int);
  123         va_end(ap);
  124         proto = (mtod(m, struct ip *))->ip_p;
  125 
  126         ret = gre_input2(m, off, proto);
  127         /*
  128          * ret == 0 : packet not processed, meaning that
  129          * no matching tunnel that is up is found.
  130          * we inject it to raw ip socket to see if anyone picks it up.
  131          */
  132         if (ret == 0)
  133                 rip_input(m, off, proto);
  134 }
  135 
  136 /*
  137  * decapsulate.
  138  * Does the real work and is called from gre_input() (above)
  139  * returns 0 if packet is not yet processed
  140  * and 1 if it needs no further processing
  141  * proto is the protocol number of the "calling" foo_input()
  142  * routine.
  143  */
  144 
  145 static int
  146 gre_input2(struct mbuf *m ,int hlen, u_char proto)
  147 {
  148         struct greip *gip = mtod(m, struct greip *);
  149         int s;
  150         struct ifqueue *ifq;
  151         struct gre_softc *sc;
  152         u_short flags;
  153 
  154         if ((sc = gre_lookup(m, proto)) == NULL) {
  155                 /* No matching tunnel or tunnel is down. */
  156                 return (0);
  157         }
  158 
  159         sc->sc_if.if_ipackets++;
  160         sc->sc_if.if_ibytes += m->m_pkthdr.len;
  161 
  162         switch (proto) {
  163         case IPPROTO_GRE:
  164                 hlen += sizeof (struct gre_h);
  165 
  166                 /* process GRE flags as packet can be of variable len */
  167                 flags = ntohs(gip->gi_flags);
  168 
  169                 /* Checksum & Offset are present */
  170                 if ((flags & GRE_CP) | (flags & GRE_RP))
  171                         hlen += 4;
  172                 /* We don't support routing fields (variable length) */
  173                 if (flags & GRE_RP)
  174                         return(0);
  175                 if (flags & GRE_KP)
  176                         hlen += 4;
  177                 if (flags & GRE_SP)
  178                         hlen +=4;
  179 
  180                 switch (ntohs(gip->gi_ptype)) { /* ethertypes */
  181                 case ETHERTYPE_IP: /* shouldn't need a schednetisr(), as */
  182                 case WCCP_PROTOCOL_TYPE: /* we are in ip_input */
  183                         ifq = &ipintrq;
  184                         break;
  185 #ifdef NS
  186                 case ETHERTYPE_NS:
  187                         ifq = &nsintrq;
  188                         schednetisr(NETISR_NS);
  189                         break;
  190 #endif
  191 #ifdef NETATALK
  192                 case ETHERTYPE_ATALK:
  193                         ifq = &atintrq1;
  194                         schednetisr(NETISR_ATALK);
  195                         break;
  196 #endif
  197                 case ETHERTYPE_IPV6:
  198                         /* FALLTHROUGH */
  199                 default:           /* others not yet supported */
  200                         return(0);
  201                 }
  202                 break;
  203         default:
  204                 /* others not yet supported */
  205                 return(0);
  206         }
  207 
  208         m->m_data += hlen;
  209         m->m_len -= hlen;
  210         m->m_pkthdr.len -= hlen;
  211 
  212         if (sc->sc_if.if_bpf) {
  213                 struct mbuf m0;
  214                 u_int32_t af = AF_INET;
  215 
  216                 m0.m_next = m;
  217                 m0.m_len = 4;
  218                 m0.m_data = (char *)&af;
  219 
  220                 bpf_mtap(&(sc->sc_if), &m0);
  221         }
  222 
  223         m->m_pkthdr.rcvif = &sc->sc_if;
  224 
  225         s = splnet();           /* possible */
  226         if (_IF_QFULL(ifq)) {
  227                 IF_DROP(ifq);
  228                 m_freem(m);
  229         } else {
  230                 IF_ENQUEUE(ifq,m);
  231         }
  232         splx(s);
  233 
  234         return(1);      /* packet is done, no further processing needed */
  235 }
  236 
  237 /*
  238  * input routine for IPPRPOTO_MOBILE
  239  * This is a little bit diffrent from the other modes, as the
  240  * encapsulating header was not prepended, but instead inserted
  241  * between IP header and payload
  242  */
  243 
  244 void
  245 #if __STDC__
  246 gre_mobile_input(struct mbuf *m, ...)
  247 #else
  248 gre_mobile_input(m, va_alist)
  249         struct mbuf *m;
  250         va_dcl
  251 #endif
  252 {
  253         struct ip *ip = mtod(m, struct ip *);
  254         struct mobip_h *mip = mtod(m, struct mobip_h *);
  255         struct ifqueue *ifq;
  256         struct gre_softc *sc;
  257         int hlen,s;
  258         va_list ap;
  259         u_char osrc = 0;
  260         int msiz;
  261 
  262         va_start(ap,m);
  263         hlen = va_arg(ap, int);
  264         va_end(ap);
  265 
  266         if ((sc = gre_lookup(m, IPPROTO_MOBILE)) == NULL) {
  267                 /* No matching tunnel or tunnel is down. */
  268                 m_freem(m);
  269                 return;
  270         }
  271 
  272         sc->sc_if.if_ipackets++;
  273         sc->sc_if.if_ibytes += m->m_pkthdr.len;
  274 
  275         if(ntohs(mip->mh.proto) & MOB_H_SBIT) {
  276                 osrc = 1;
  277                 msiz = MOB_H_SIZ_L;
  278                 mip->mi.ip_src.s_addr = mip->mh.osrc;
  279         } else {
  280                 msiz = MOB_H_SIZ_S;
  281         }
  282         mip->mi.ip_dst.s_addr = mip->mh.odst;
  283         mip->mi.ip_p = (ntohs(mip->mh.proto) >> 8);
  284 
  285         if (gre_in_cksum((u_short*)&mip->mh,msiz) != 0) {
  286                 m_freem(m);
  287                 return;
  288         }
  289 
  290         bcopy((caddr_t)(ip) + (ip->ip_hl << 2) + msiz, (caddr_t)(ip) +
  291             (ip->ip_hl << 2), m->m_len - msiz - (ip->ip_hl << 2));
  292         m->m_len -= msiz;
  293         m->m_pkthdr.len -= msiz;
  294 
  295         /*
  296          * On FreeBSD, rip_input() supplies us with ip->ip_len
  297          * already converted into host byteorder and also decreases
  298          * it by the lengh of IP header, however, ip_input() expects
  299          * that this field is in the original format (network byteorder
  300          * and full size of IP packet), so that adjust accordingly.
  301          */
  302         ip->ip_len = htons(ip->ip_len + sizeof(struct ip) - msiz);
  303 
  304         ip->ip_sum = 0;
  305         ip->ip_sum = in_cksum(m, (ip->ip_hl << 2));
  306 
  307         if (sc->sc_if.if_bpf) {
  308                 struct mbuf m0;
  309                 u_int af = AF_INET;
  310 
  311                 m0.m_next = m;
  312                 m0.m_len = 4;
  313                 m0.m_data = (char *)&af;
  314 
  315                 bpf_mtap(&(sc->sc_if), &m0);
  316         }
  317 
  318         m->m_pkthdr.rcvif = &sc->sc_if;
  319 
  320         ifq = &ipintrq;
  321         s = splnet();       /* possible */
  322         if (_IF_QFULL(ifq)) {
  323                 IF_DROP(ifq);
  324                 m_freem(m);
  325         } else {
  326                 IF_ENQUEUE(ifq,m);
  327         }
  328         splx(s);
  329 }
  330 
  331 /*
  332  * Find the gre interface associated with our src/dst/proto set.
  333  */
  334 static struct gre_softc *
  335 gre_lookup(m, proto)
  336         struct mbuf *m;
  337         u_int8_t proto;
  338 {
  339         struct ip *ip = mtod(m, struct ip *);
  340         struct gre_softc *sc;
  341 
  342         for (sc = LIST_FIRST(&gre_softc_list); sc != NULL;
  343              sc = LIST_NEXT(sc, sc_list)) {
  344                 if ((sc->g_dst.s_addr == ip->ip_src.s_addr) &&
  345                     (sc->g_src.s_addr == ip->ip_dst.s_addr) &&
  346                     (sc->g_proto == proto) &&
  347                     ((sc->sc_if.if_flags & IFF_UP) != 0))
  348                         return (sc);
  349         }
  350 
  351         return (NULL);
  352 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet/ip_gre.c

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