ip_gre.c

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    1 /*      $NetBSD: ip_gre.c,v 1.33.2.1 2005/03/30 21:35:13 tron Exp $ */
    2 
    3 /*
    4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Heiko W.Rupp <hwr@pilhuhn.de>
    9  *
   10  * IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.de>
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. All advertising materials mentioning features or use of this software
   21  *    must display the following acknowledgement:
   22  *        This product includes software developed by the NetBSD
   23  *        Foundation, Inc. and its contributors.
   24  * 4. Neither the name of The NetBSD Foundation nor the names of its
   25  *    contributors may be used to endorse or promote products derived
   26  *    from this software without specific prior written permission.
   27  *
   28  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   29  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   30  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   31  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   32  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   33  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   34  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   35  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   36  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   37  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   38  * POSSIBILITY OF SUCH DAMAGE.
   39  */
   40 
   41 /*
   42  * deencapsulate tunneled packets and send them on
   43  * output half is in net/if_gre.[ch]
   44  * This currently handles IPPROTO_GRE, IPPROTO_MOBILE
   45  */
   46 
   47 #include <sys/cdefs.h>
   48 __KERNEL_RCSID(0, "$NetBSD: ip_gre.c,v 1.33.2.1 2005/03/30 21:35:13 tron Exp $");
   49 
   50 #include "gre.h"
   51 #if NGRE > 0
   52 
   53 #include "opt_inet.h"
   54 #include "opt_ns.h"
   55 #include "opt_atalk.h"
   56 #include "bpfilter.h"
   57 
   58 #include <sys/param.h>
   59 #include <sys/systm.h>
   60 #include <sys/mbuf.h>
   61 #include <sys/socket.h>
   62 #include <sys/socketvar.h>
   63 #include <sys/protosw.h>
   64 #include <sys/errno.h>
   65 #include <sys/time.h>
   66 #include <sys/kernel.h>
   67 #include <sys/ioctl.h>
   68 #include <sys/syslog.h>
   69 #include <net/bpf.h>
   70 #include <net/ethertypes.h>
   71 #include <net/if.h>
   72 #include <net/netisr.h>
   73 #include <net/route.h>
   74 #include <net/raw_cb.h>
   75 
   76 #ifdef INET
   77 #include <netinet/in.h>
   78 #include <netinet/in_var.h>
   79 #include <netinet/in_systm.h>
   80 #include <netinet/ip.h>
   81 #include <netinet/ip_var.h>
   82 #include <netinet/ip_gre.h>
   83 #else
   84 #error ip_gre input without IP?
   85 #endif
   86 
   87 #ifdef NS
   88 #include <netns/ns.h>
   89 #include <netns/ns_if.h>
   90 #endif
   91 
   92 #ifdef NETATALK
   93 #include <netatalk/at.h>
   94 #include <netatalk/at_var.h>
   95 #include <netatalk/at_extern.h>
   96 #endif
   97 
   98 /* Needs IP headers. */
   99 #include <net/if_gre.h>
  100 
  101 #include <machine/stdarg.h>
  102 
  103 #if 1
  104 void gre_inet_ntoa(struct in_addr in);  /* XXX */
  105 #endif
  106 
  107 struct gre_softc *gre_lookup(struct mbuf *, u_int8_t);
  108 
  109 int gre_input2(struct mbuf *, int, u_char);
  110 
  111 /*
  112  * De-encapsulate a packet and feed it back through ip input (this
  113  * routine is called whenever IP gets a packet with proto type
  114  * IPPROTO_GRE and a local destination address).
  115  * This really is simple
  116  */
  117 void
  118 gre_input(struct mbuf *m, ...)
  119 {
  120         int off, ret, proto;
  121         va_list ap;
  122 
  123         va_start(ap, m);
  124         off = va_arg(ap, int);
  125         proto = va_arg(ap, int);
  126         va_end(ap);
  127 
  128         ret = gre_input2(m, off, proto);
  129         /*
  130          * ret == 0 : packet not processed, meaning that
  131          * no matching tunnel that is up is found.
  132          * we inject it to raw ip socket to see if anyone picks it up.
  133          */
  134         if (ret == 0)
  135                 rip_input(m, off, proto);
  136 }
  137 
  138 /*
  139  * decapsulate.
  140  * Does the real work and is called from gre_input() (above)
  141  * returns 0 if packet is not yet processed
  142  * and 1 if it needs no further processing
  143  * proto is the protocol number of the "calling" foo_input()
  144  * routine.
  145  */
  146 int
  147 gre_input2(struct mbuf *m, int hlen, u_char proto)
  148 {
  149         struct greip *gip;
  150         int s, isr;
  151         struct ifqueue *ifq;
  152         struct gre_softc *sc;
  153         u_int16_t flags;
  154 
  155         if ((sc = gre_lookup(m, proto)) == NULL) {
  156                 /* No matching tunnel or tunnel is down. */
  157                 return (0);
  158         }
  159 
  160         if (m->m_len < sizeof(*gip)) {
  161                 m = m_pullup(m, sizeof(*gip));
  162                 if (m == NULL)
  163                         return (ENOBUFS);
  164         }
  165         gip = mtod(m, struct greip *);
  166 
  167         sc->sc_if.if_ipackets++;
  168         sc->sc_if.if_ibytes += m->m_pkthdr.len;
  169 
  170         switch (proto) {
  171         case IPPROTO_GRE:
  172                 hlen += sizeof(struct gre_h);
  173 
  174                 /* process GRE flags as packet can be of variable len */
  175                 flags = ntohs(gip->gi_flags);
  176 
  177                 /* Checksum & Offset are present */
  178                 if ((flags & GRE_CP) | (flags & GRE_RP))
  179                         hlen += 4;
  180                 /* We don't support routing fields (variable length) */
  181                 if (flags & GRE_RP)
  182                         return (0);
  183                 if (flags & GRE_KP)
  184                         hlen += 4;
  185                 if (flags & GRE_SP)
  186                         hlen += 4;
  187 
  188                 switch (ntohs(gip->gi_ptype)) { /* ethertypes */
  189                 case ETHERTYPE_IP: /* shouldn't need a schednetisr(), as */
  190                         ifq = &ipintrq;          /* we are in ip_input */
  191                         isr = NETISR_IP;
  192                         break;
  193 #ifdef NS
  194                 case ETHERTYPE_NS:
  195                         ifq = &nsintrq;
  196                         isr = NETISR_NS;
  197                         break;
  198 #endif
  199 #ifdef NETATALK
  200                 case ETHERTYPE_ATALK:
  201                         ifq = &atintrq1;
  202                         isr = NETISR_ATALK;
  203                         break;
  204 #endif
  205 #ifdef INET6
  206                 case ETHERTYPE_IPV6:
  207 #ifdef GRE_DEBUG
  208                         printf( "ip_gre.c/gre_input2: IPv6 packet\n" );
  209 #endif
  210                         ifq = &ip6intrq;
  211                         isr = NETISR_IPV6;
  212                         break;
  213 #endif
  214                 default:           /* others not yet supported */
  215                         printf( "ip_gre.c/gre_input2: unhandled ethertype 0x%04x\n", (int) ntohs(gip->gi_ptype) );
  216                         return (0);
  217                 }
  218                 break;
  219         default:
  220                 /* others not yet supported */
  221                 return (0);
  222         }
  223 
  224         if (hlen > m->m_pkthdr.len) {
  225                 m_freem(m);
  226                 return (EINVAL);
  227         }
  228         m_adj(m, hlen);
  229 
  230 #if NBPFILTER > 0
  231         if (sc->sc_if.if_bpf) {
  232                 struct mbuf m0;
  233                 u_int32_t af = AF_INET;
  234 
  235                 m0.m_flags = 0;
  236                 m0.m_next = m;
  237                 m0.m_len = 4;
  238                 m0.m_data = (char *)&af;
  239 
  240                 bpf_mtap(sc->sc_if.if_bpf, &m0);
  241         }
  242 #endif /*NBPFILTER > 0*/
  243 
  244         m->m_pkthdr.rcvif = &sc->sc_if;
  245 
  246         s = splnet();           /* possible */
  247         if (IF_QFULL(ifq)) {
  248                 IF_DROP(ifq);
  249                 m_freem(m);
  250         } else {
  251                 IF_ENQUEUE(ifq, m);
  252         }
  253         /* we need schednetisr since the address family may change */
  254         schednetisr(isr);
  255         splx(s);
  256 
  257         return (1);     /* packet is done, no further processing needed */
  258 }
  259 
  260 /*
  261  * input routine for IPPRPOTO_MOBILE
  262  * This is a little bit diffrent from the other modes, as the
  263  * encapsulating header was not prepended, but instead inserted
  264  * between IP header and payload
  265  */
  266 void
  267 gre_mobile_input(struct mbuf *m, ...)
  268 {
  269         struct ip *ip;
  270         struct mobip_h *mip;
  271         struct ifqueue *ifq;
  272         struct gre_softc *sc;
  273         int hlen, s;
  274         va_list ap;
  275         int msiz;
  276 
  277         va_start(ap, m);
  278         hlen = va_arg(ap, int);
  279         va_end(ap);
  280 
  281         if ((sc = gre_lookup(m, IPPROTO_MOBILE)) == NULL) {
  282                 /* No matching tunnel or tunnel is down. */
  283                 m_freem(m);
  284                 return;
  285         }
  286 
  287         if (m->m_len < sizeof(*mip)) {
  288                 m = m_pullup(m, sizeof(*mip));
  289                 if (m == NULL)
  290                         return;
  291         }
  292         ip = mtod(m, struct ip *);
  293         mip = mtod(m, struct mobip_h *);
  294 
  295         sc->sc_if.if_ipackets++;
  296         sc->sc_if.if_ibytes += m->m_pkthdr.len;
  297 
  298         if (ntohs(mip->mh.proto) & MOB_H_SBIT) {
  299                 msiz = MOB_H_SIZ_L;
  300                 mip->mi.ip_src.s_addr = mip->mh.osrc;
  301         } else
  302                 msiz = MOB_H_SIZ_S;
  303 
  304         if (m->m_len < (ip->ip_hl << 2) + msiz) {
  305                 m = m_pullup(m, (ip->ip_hl << 2) + msiz);
  306                 if (m == NULL)
  307                         return;
  308                 ip = mtod(m, struct ip *);
  309                 mip = mtod(m, struct mobip_h *);
  310         }
  311 
  312         mip->mi.ip_dst.s_addr = mip->mh.odst;
  313         mip->mi.ip_p = (ntohs(mip->mh.proto) >> 8);
  314 
  315         if (gre_in_cksum((u_int16_t *)&mip->mh, msiz) != 0) {
  316                 m_freem(m);
  317                 return;
  318         }
  319 
  320         memmove(ip + (ip->ip_hl << 2), ip + (ip->ip_hl << 2) + msiz,
  321                 m->m_len - msiz - (ip->ip_hl << 2));
  322         m->m_len -= msiz;
  323         ip->ip_len = htons(ntohs(ip->ip_len) - msiz);
  324         m->m_pkthdr.len -= msiz;
  325 
  326         ip->ip_sum = 0;
  327         ip->ip_sum = in_cksum(m, (ip->ip_hl << 2));
  328 
  329 #if NBPFILTER > 0
  330         if (sc->sc_if.if_bpf) {
  331                 struct mbuf m0;
  332                 u_int af = AF_INET;
  333 
  334                 m0.m_next = m;
  335                 m0.m_len = 4;
  336                 m0.m_data = (char *)&af;
  337 
  338                 bpf_mtap(sc->sc_if.if_bpf, &m0);
  339         }
  340 #endif /*NBPFILTER > 0*/
  341 
  342         ifq = &ipintrq;
  343         s = splnet();       /* possible */
  344         if (IF_QFULL(ifq)) {
  345                 IF_DROP(ifq);
  346                 m_freem(m);
  347         } else {
  348                 IF_ENQUEUE(ifq, m);
  349         }
  350         splx(s);
  351 }
  352 
  353 /*
  354  * Find the gre interface associated with our src/dst/proto set.
  355  */
  356 struct gre_softc *
  357 gre_lookup(struct mbuf *m, u_int8_t proto)
  358 {
  359         struct ip *ip = mtod(m, struct ip *);
  360         struct gre_softc *sc;
  361 
  362         for (sc = LIST_FIRST(&gre_softc_list); sc != NULL;
  363              sc = LIST_NEXT(sc, sc_list)) {
  364                 if ((sc->g_dst.s_addr == ip->ip_src.s_addr) &&
  365                     (sc->g_src.s_addr == ip->ip_dst.s_addr) &&
  366                     (sc->g_proto == proto) &&
  367                     ((sc->sc_if.if_flags & IFF_UP) != 0))
  368                         return (sc);
  369         }
  370 
  371         return (NULL);
  372 }
  373 
  374 #endif /* if NGRE > 0 */
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FreeBSD/Linux Kernel Cross Reference sys/netinet/ip_gre.c

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