ip_gre.c

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    1 /*      $NetBSD: ip_gre.c,v 1.29 2003/09/05 23:02:43 itojun 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  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *        This product includes software developed by the NetBSD
   21  *        Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 /*
   40  * deencapsulate tunneled packets and send them on
   41  * output half is in net/if_gre.[ch]
   42  * This currently handles IPPROTO_GRE, IPPROTO_MOBILE
   43  */
   44 
   45 #include <sys/cdefs.h>
   46 __KERNEL_RCSID(0, "$NetBSD: ip_gre.c,v 1.29 2003/09/05 23:02:43 itojun Exp $");
   47 
   48 #include "gre.h"
   49 #if NGRE > 0
   50 
   51 #include "opt_inet.h"
   52 #include "opt_ns.h"
   53 #include "opt_atalk.h"
   54 #include "bpfilter.h"
   55 
   56 #include <sys/param.h>
   57 #include <sys/systm.h>
   58 #include <sys/mbuf.h>
   59 #include <sys/socket.h>
   60 #include <sys/socketvar.h>
   61 #include <sys/protosw.h>
   62 #include <sys/errno.h>
   63 #include <sys/time.h>
   64 #include <sys/kernel.h>
   65 #include <sys/ioctl.h>
   66 #include <sys/syslog.h>
   67 #include <net/bpf.h>
   68 #include <net/ethertypes.h>
   69 #include <net/if.h>
   70 #include <net/netisr.h>
   71 #include <net/route.h>
   72 #include <net/raw_cb.h>
   73 
   74 #ifdef INET
   75 #include <netinet/in.h>
   76 #include <netinet/in_var.h>
   77 #include <netinet/in_systm.h>
   78 #include <netinet/ip.h>
   79 #include <netinet/ip_var.h>
   80 #include <netinet/ip_gre.h>
   81 #else
   82 #error ip_gre input without IP?
   83 #endif
   84 
   85 #ifdef NS
   86 #include <netns/ns.h>
   87 #include <netns/ns_if.h>
   88 #endif
   89 
   90 #ifdef NETATALK
   91 #include <netatalk/at.h>
   92 #include <netatalk/at_var.h>
   93 #include <netatalk/at_extern.h>
   94 #endif
   95 
   96 /* Needs IP headers. */
   97 #include <net/if_gre.h>
   98 
   99 #include <machine/stdarg.h>
  100 
  101 #if 1
  102 void gre_inet_ntoa(struct in_addr in);  /* XXX */
  103 #endif
  104 
  105 struct gre_softc *gre_lookup __P((struct mbuf *, u_int8_t));
  106 
  107 int     gre_input2 __P((struct mbuf *, int, u_char));
  108 
  109 /*
  110  * De-encapsulate a packet and feed it back through ip input (this
  111  * routine is called whenever IP gets a packet with proto type
  112  * IPPROTO_GRE and a local destination address).
  113  * This really is simple
  114  */
  115 void
  116 #if __STDC__
  117 gre_input(struct mbuf *m, ...)
  118 #else
  119 gre_input(m, va_alist)
  120         struct mbuf *m;
  121         va_dcl
  122 #endif
  123 {
  124         int off, ret, proto;
  125         va_list ap;
  126 
  127         va_start(ap, m);
  128         off = va_arg(ap, int);
  129         proto = va_arg(ap, int);
  130         va_end(ap);
  131 
  132         ret = gre_input2(m, off, proto);
  133         /*
  134          * ret == 0 : packet not processed, meaning that 
  135          * no matching tunnel that is up is found.
  136          * we inject it to raw ip socket to see if anyone picks it up.
  137          */
  138         if (ret == 0)
  139                 rip_input(m, off, proto);
  140 }
  141 
  142 /*
  143  * decapsulate.
  144  * Does the real work and is called from gre_input() (above)
  145  * returns 0 if packet is not yet processed
  146  * and 1 if it needs no further processing
  147  * proto is the protocol number of the "calling" foo_input()
  148  * routine.
  149  */
  150 int
  151 gre_input2(struct mbuf *m, int hlen, u_char proto)
  152 {
  153         struct greip *gip;
  154         int s;
  155         struct ifqueue *ifq;
  156         struct gre_softc *sc;
  157         u_int16_t flags;
  158 
  159         if ((sc = gre_lookup(m, proto)) == NULL) {
  160                 /* No matching tunnel or tunnel is down. */
  161                 return (0);
  162         }
  163 
  164         if (m->m_len < sizeof(*gip)) {
  165                 m = m_pullup(m, sizeof(*gip));
  166                 if (m == NULL)
  167                         return (ENOBUFS);
  168         }
  169         gip = mtod(m, struct greip *);
  170 
  171         sc->sc_if.if_ipackets++;
  172         sc->sc_if.if_ibytes += m->m_pkthdr.len;
  173 
  174         switch (proto) {
  175         case IPPROTO_GRE:
  176                 hlen += sizeof(struct gre_h);
  177 
  178                 /* process GRE flags as packet can be of variable len */
  179                 flags = ntohs(gip->gi_flags);
  180 
  181                 /* Checksum & Offset are present */
  182                 if ((flags & GRE_CP) | (flags & GRE_RP))
  183                         hlen += 4;
  184                 /* We don't support routing fields (variable length) */
  185                 if (flags & GRE_RP)
  186                         return (0);
  187                 if (flags & GRE_KP)
  188                         hlen += 4;
  189                 if (flags & GRE_SP)
  190                         hlen += 4;
  191 
  192                 switch (ntohs(gip->gi_ptype)) { /* ethertypes */
  193                 case ETHERTYPE_IP: /* shouldn't need a schednetisr(), as */
  194                         ifq = &ipintrq;          /* we are in ip_input */
  195                         break;
  196 #ifdef NS
  197                 case ETHERTYPE_NS:
  198                         ifq = &nsintrq;
  199                         schednetisr(NETISR_NS);
  200                         break;
  201 #endif
  202 #ifdef NETATALK
  203                 case ETHERTYPE_ATALK:
  204                         ifq = &atintrq1;
  205                         schednetisr(NETISR_ATALK);
  206                         break;
  207 #endif
  208                 case ETHERTYPE_IPV6:
  209                         /* FALLTHROUGH */
  210                 default:           /* others not yet supported */
  211                         return (0);
  212                 }
  213                 break;
  214         default:
  215                 /* others not yet supported */
  216                 return (0);
  217         }
  218 
  219         if (hlen > m->m_pkthdr.len) {
  220                 m_freem(m);
  221                 return (EINVAL);
  222         }
  223         m_adj(m, hlen);
  224 
  225 #if NBPFILTER > 0
  226         if (sc->sc_if.if_bpf) {
  227                 struct mbuf m0;
  228                 u_int32_t af = AF_INET;
  229 
  230                 m0.m_flags = 0;
  231                 m0.m_next = m;
  232                 m0.m_len = 4;
  233                 m0.m_data = (char *)&af;
  234 
  235                 bpf_mtap(sc->sc_if.if_bpf, &m0);
  236         }
  237 #endif /*NBPFILTER > 0*/
  238 
  239         m->m_pkthdr.rcvif = &sc->sc_if;
  240 
  241         s = splnet();           /* possible */
  242         if (IF_QFULL(ifq)) {
  243                 IF_DROP(ifq);
  244                 m_freem(m);
  245         } else {
  246                 IF_ENQUEUE(ifq, m);
  247         }
  248         splx(s);
  249 
  250         return (1);     /* packet is done, no further processing needed */
  251 }
  252 
  253 /*
  254  * input routine for IPPRPOTO_MOBILE
  255  * This is a little bit diffrent from the other modes, as the
  256  * encapsulating header was not prepended, but instead inserted
  257  * between IP header and payload
  258  */
  259 void
  260 #if __STDC__
  261 gre_mobile_input(struct mbuf *m, ...)
  262 #else
  263 gre_mobile_input(m, va_alist)
  264         struct mbuf *m;
  265         va_dcl
  266 #endif
  267 {
  268         struct ip *ip;
  269         struct mobip_h *mip;
  270         struct ifqueue *ifq;
  271         struct gre_softc *sc;
  272         int hlen, s;
  273         va_list ap;
  274         int msiz;
  275 
  276         va_start(ap, m);
  277         hlen = va_arg(ap, int);
  278         va_end(ap);
  279 
  280         if ((sc = gre_lookup(m, IPPROTO_MOBILE)) == NULL) {
  281                 /* No matching tunnel or tunnel is down. */
  282                 m_freem(m);
  283                 return;
  284         }
  285 
  286         if (m->m_len < sizeof(*mip)) {
  287                 m = m_pullup(m, sizeof(*mip));
  288                 if (m == NULL)
  289                         return;
  290         }
  291         ip = mtod(m, struct ip *);
  292         mip = mtod(m, struct mobip_h *);
  293 
  294         sc->sc_if.if_ipackets++;
  295         sc->sc_if.if_ibytes += m->m_pkthdr.len;
  296 
  297         if (ntohs(mip->mh.proto) & MOB_H_SBIT) {
  298                 msiz = MOB_H_SIZ_L;
  299                 mip->mi.ip_src.s_addr = mip->mh.osrc;
  300         } else
  301                 msiz = MOB_H_SIZ_S;
  302 
  303         if (m->m_len < (ip->ip_hl << 2) + msiz) {
  304                 m = m_pullup(m, (ip->ip_hl << 2) + msiz);
  305                 if (m == NULL)
  306                         return;
  307                 ip = mtod(m, struct ip *);
  308                 mip = mtod(m, struct mobip_h *);
  309         }
  310 
  311         mip->mi.ip_dst.s_addr = mip->mh.odst;
  312         mip->mi.ip_p = (ntohs(mip->mh.proto) >> 8);
  313 
  314         if (gre_in_cksum((u_int16_t *)&mip->mh, msiz) != 0) {
  315                 m_freem(m);
  316                 return;
  317         }
  318 
  319         memmove(ip + (ip->ip_hl << 2), ip + (ip->ip_hl << 2) + msiz,
  320                 m->m_len - msiz - (ip->ip_hl << 2));
  321         m->m_len -= msiz;
  322         ip->ip_len = htons(ntohs(ip->ip_len) - msiz);
  323         m->m_pkthdr.len -= msiz;
  324 
  325         ip->ip_sum = 0;
  326         ip->ip_sum = in_cksum(m, (ip->ip_hl << 2));
  327 
  328 #if NBPFILTER > 0
  329         if (sc->sc_if.if_bpf) {
  330                 struct mbuf m0;
  331                 u_int af = AF_INET;
  332 
  333                 m0.m_next = m;
  334                 m0.m_len = 4;
  335                 m0.m_data = (char *)&af;
  336 
  337                 bpf_mtap(sc->sc_if.if_bpf, &m0);
  338         }
  339 #endif /*NBPFILTER > 0*/
  340 
  341         ifq = &ipintrq;
  342         s = splnet();       /* possible */
  343         if (IF_QFULL(ifq)) {
  344                 IF_DROP(ifq);
  345                 m_freem(m);
  346         } else {
  347                 IF_ENQUEUE(ifq, m);
  348         }
  349         splx(s);
  350 }
  351 
  352 /*
  353  * Find the gre interface associated with our src/dst/proto set.
  354  */
  355 struct gre_softc *
  356 gre_lookup(m, proto)
  357         struct mbuf *m;
  358         u_int8_t proto;
  359 {
  360         struct ip *ip = mtod(m, struct ip *);
  361         struct gre_softc *sc;
  362 
  363         for (sc = LIST_FIRST(&gre_softc_list); sc != NULL;
  364              sc = LIST_NEXT(sc, sc_list)) {
  365                 if ((sc->g_dst.s_addr == ip->ip_src.s_addr) &&
  366                     (sc->g_src.s_addr == ip->ip_dst.s_addr) &&
  367                     (sc->g_proto == proto) &&
  368                     ((sc->sc_if.if_flags & IFF_UP) != 0))
  369                         return (sc);
  370         }
  371 
  372         return (NULL);
  373 }
  374 
  375 #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
