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/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_atalk.h"
   48 
   49 #include <sys/param.h>
   50 #include <sys/systm.h>
   51 #include <sys/mbuf.h>
   52 #include <sys/socket.h>
   53 #include <sys/socketvar.h>
   54 #include <sys/protosw.h>
   55 #include <sys/errno.h>
   56 #include <sys/time.h>
   57 #include <sys/kernel.h>
   58 #include <sys/syslog.h>
   59 #include <net/bpf.h>
   60 #include <net/ethernet.h>
   61 #include <net/if.h>
   62 #include <net/netisr.h>
   63 #include <net/route.h>
   64 #include <net/raw_cb.h>
   65 
   66 #ifdef INET
   67 #include <netinet/in.h>
   68 #include <netinet/in_var.h>
   69 #include <netinet/in_systm.h>
   70 #include <netinet/ip.h>
   71 #include <netinet/ip_var.h>
   72 #include <netinet/ip_gre.h>
   73 #include <machine/in_cksum.h>
   74 #else
   75 #error ip_gre input without IP?
   76 #endif
   77 
   78 #ifdef NETATALK
   79 #include <netatalk/at.h>
   80 #include <netatalk/at_var.h>
   81 #include <netatalk/at_extern.h>
   82 #endif
   83 
   84 /* Needs IP headers. */
   85 #include <net/if_gre.h>
   86 
   87 #include <machine/stdarg.h>
   88 
   89 #if 1
   90 void gre_inet_ntoa(struct in_addr in);  /* XXX */
   91 #endif
   92 
   93 static struct gre_softc *gre_lookup(struct mbuf *, u_int8_t);
   94 
   95 static int      gre_input2(struct mbuf *, int, u_char);
   96 
   97 /*
   98  * De-encapsulate a packet and feed it back through ip input (this
   99  * routine is called whenever IP gets a packet with proto type
  100  * IPPROTO_GRE and a local destination address).
  101  * This really is simple
  102  */
  103 void
  104 #if __STDC__
  105 gre_input(struct mbuf *m, ...)
  106 #else
  107 gre_input(m, va_alist)
  108         struct mbuf *m;
  109         va_dcl
  110 #endif
  111 {
  112         int off, ret, proto;
  113         va_list ap;
  114 
  115         va_start(ap, m);
  116         off = va_arg(ap, int);
  117         va_end(ap);
  118         proto = (mtod(m, struct ip *))->ip_p;
  119 
  120         ret = gre_input2(m, off, proto);
  121         /*
  122          * ret == 0 : packet not processed, meaning that 
  123          * no matching tunnel that is up is found.
  124          * we inject it to raw ip socket to see if anyone picks it up.
  125          */
  126         if (ret == 0)
  127                 rip_input(m, off);
  128 }
  129 
  130 /*
  131  * decapsulate.
  132  * Does the real work and is called from gre_input() (above)
  133  * returns 0 if packet is not yet processed
  134  * and 1 if it needs no further processing
  135  * proto is the protocol number of the "calling" foo_input()
  136  * routine.
  137  */
  138 
  139 static int
  140 gre_input2(struct mbuf *m ,int hlen, u_char proto)
  141 {
  142         struct greip *gip = mtod(m, struct greip *);
  143         int isr;
  144         struct gre_softc *sc;
  145         u_short flags;
  146 
  147         if ((sc = gre_lookup(m, proto)) == NULL) {
  148                 /* No matching tunnel or tunnel is down. */
  149                 return (0);
  150         }
  151 
  152         sc->sc_if.if_ipackets++;
  153         sc->sc_if.if_ibytes += m->m_pkthdr.len;
  154 
  155         switch (proto) {
  156         case IPPROTO_GRE:
  157                 hlen += sizeof (struct gre_h);
  158 
  159                 /* process GRE flags as packet can be of variable len */
  160                 flags = ntohs(gip->gi_flags);
  161 
  162                 /* Checksum & Offset are present */
  163                 if ((flags & GRE_CP) | (flags & GRE_RP))
  164                         hlen += 4;
  165                 /* We don't support routing fields (variable length) */
  166                 if (flags & GRE_RP)
  167                         return(0);
  168                 if (flags & GRE_KP)
  169                         hlen += 4;
  170                 if (flags & GRE_SP)
  171                         hlen +=4;
  172 
  173                 switch (ntohs(gip->gi_ptype)) { /* ethertypes */
  174                 case ETHERTYPE_IP: /* shouldn't need a schednetisr(), as */
  175                 case WCCP_PROTOCOL_TYPE: /* we are in ip_input */
  176                         isr = NETISR_IP;        
  177                         break;
  178 #ifdef NETATALK
  179                 case ETHERTYPE_ATALK:
  180                         isr = NETISR_ATALK1;
  181                         break;
  182 #endif
  183                 case ETHERTYPE_IPV6:
  184                         /* FALLTHROUGH */
  185                 default:           /* others not yet supported */
  186                         return(0);
  187                 }
  188                 break;
  189         default:
  190                 /* others not yet supported */
  191                 return(0);
  192         }
  193 
  194         m->m_data += hlen;
  195         m->m_len -= hlen;
  196         m->m_pkthdr.len -= hlen;
  197 
  198         if (sc->sc_if.if_bpf) {
  199                 struct mbuf m0;
  200                 u_int32_t af = AF_INET;
  201 
  202                 m0.m_next = m;
  203                 m0.m_len = 4;
  204                 m0.m_data = (char *)&af;
  205 
  206                 BPF_MTAP(&(sc->sc_if), &m0);
  207         }
  208 
  209         m->m_pkthdr.rcvif = &sc->sc_if;
  210 
  211         netisr_dispatch(isr, m);
  212 
  213         return(1);      /* packet is done, no further processing needed */
  214 }
  215 
  216 /*
  217  * input routine for IPPRPOTO_MOBILE
  218  * This is a little bit diffrent from the other modes, as the
  219  * encapsulating header was not prepended, but instead inserted
  220  * between IP header and payload
  221  */
  222 
  223 void
  224 #if __STDC__
  225 gre_mobile_input(struct mbuf *m, ...)
  226 #else
  227 gre_mobile_input(m, va_alist)
  228         struct mbuf *m;
  229         va_dcl
  230 #endif
  231 {
  232         struct ip *ip = mtod(m, struct ip *);
  233         struct mobip_h *mip = mtod(m, struct mobip_h *);
  234         struct gre_softc *sc;
  235         int hlen;
  236         va_list ap;
  237         u_char osrc = 0;
  238         int msiz;
  239 
  240         va_start(ap,m);
  241         hlen = va_arg(ap, int);
  242         va_end(ap);
  243 
  244         if ((sc = gre_lookup(m, IPPROTO_MOBILE)) == NULL) {
  245                 /* No matching tunnel or tunnel is down. */
  246                 m_freem(m);
  247                 return;
  248         }
  249 
  250         sc->sc_if.if_ipackets++;
  251         sc->sc_if.if_ibytes += m->m_pkthdr.len;
  252 
  253         if(ntohs(mip->mh.proto) & MOB_H_SBIT) {
  254                 osrc = 1;
  255                 msiz = MOB_H_SIZ_L;
  256                 mip->mi.ip_src.s_addr = mip->mh.osrc;
  257         } else {
  258                 msiz = MOB_H_SIZ_S;
  259         }
  260         mip->mi.ip_dst.s_addr = mip->mh.odst;
  261         mip->mi.ip_p = (ntohs(mip->mh.proto) >> 8);
  262 
  263         if (gre_in_cksum((u_short*)&mip->mh,msiz) != 0) {
  264                 m_freem(m);
  265                 return;
  266         }
  267 
  268         bcopy((caddr_t)(ip) + (ip->ip_hl << 2) + msiz, (caddr_t)(ip) +
  269             (ip->ip_hl << 2), m->m_len - msiz - (ip->ip_hl << 2));
  270         m->m_len -= msiz;
  271         m->m_pkthdr.len -= msiz;
  272 
  273         /*
  274          * On FreeBSD, rip_input() supplies us with ip->ip_len
  275          * already converted into host byteorder and also decreases
  276          * it by the lengh of IP header, however, ip_input() expects
  277          * that this field is in the original format (network byteorder
  278          * and full size of IP packet), so that adjust accordingly.
  279          */
  280         ip->ip_len = htons(ip->ip_len + sizeof(struct ip) - msiz);
  281         
  282         ip->ip_sum = 0;
  283         ip->ip_sum = in_cksum(m, (ip->ip_hl << 2));
  284 
  285         if (sc->sc_if.if_bpf) {
  286                 struct mbuf m0;
  287                 u_int af = AF_INET;
  288 
  289                 m0.m_next = m;
  290                 m0.m_len = 4;
  291                 m0.m_data = (char *)&af;
  292 
  293                 BPF_MTAP(&(sc->sc_if), &m0);
  294         }
  295 
  296         m->m_pkthdr.rcvif = &sc->sc_if;
  297 
  298         netisr_dispatch(NETISR_IP, m);
  299 }
  300 
  301 /*
  302  * Find the gre interface associated with our src/dst/proto set.
  303  */
  304 static struct gre_softc *
  305 gre_lookup(m, proto)
  306         struct mbuf *m;
  307         u_int8_t proto;
  308 {
  309         struct ip *ip = mtod(m, struct ip *);
  310         struct gre_softc *sc;
  311 
  312         for (sc = LIST_FIRST(&gre_softc_list); sc != NULL;
  313              sc = LIST_NEXT(sc, sc_list)) {
  314                 if ((sc->g_dst.s_addr == ip->ip_src.s_addr) &&
  315                     (sc->g_src.s_addr == ip->ip_dst.s_addr) &&
  316                     (sc->g_proto == proto) &&
  317                     ((sc->sc_if.if_flags & IFF_UP) != 0))
  318                         return (sc);
  319         }
  320 
  321         return (NULL);
  322 }

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