378 lines
8.8 KiB
C
378 lines
8.8 KiB
C
/* $NetBSD: ip_gre.c,v 1.4 1998/10/07 23:33:02 thorpej Exp $ */
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/*
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Heiko W.Rupp <hwr@pilhuhn.de>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* deencapsulate tunneled packets and send them on
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* output half is in net/if_gre.[ch]
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* This currently handles IPPROTO_IPIP, IPPROTO_GRE, IPPROTO_MOBILE
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*/
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#include "gre.h"
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#if NGRE > 0
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#include "opt_inet.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/protosw.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/ioctl.h>
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#include <sys/syslog.h>
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#include <net/ethertypes.h>
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#include <net/if.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <net/raw_cb.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#else
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#error ip_gre input without IP?
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#endif
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#ifdef NS
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#include <netns/ns.h>
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#include <netns/ns_if.h>
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#endif
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#ifdef NETATALK
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#include <netatalk/at.h>
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#include <netatalk/at_var.h>
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#include <netatalk/at_extern.h>
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#endif
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#include <machine/stdarg.h>
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#include "ip_gre.h"
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#include <net/if_gre.h>
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#if 1
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void gre_inet_ntoa(struct in_addr in); /* XXX */
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#endif
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extern struct gre_softc gre_softc[NGRE];
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static int match_tunnel(struct mbuf *m,u_char proto);
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/*
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* De-encapsulate a packet and feed it back through ip input (this
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* routine is called whenever IP gets a packet with proto type
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* IPPROTO_GRE and a local destination address).
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* This really is simple
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*/
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void
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#if __STDC__
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gre_input(struct mbuf *m, ...)
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#else
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gre_input(m, va_alist)
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struct mbuf *m;
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va_dcl
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#endif
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{
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register int hlen,ret;
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va_list ap;
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va_start(ap, m);
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hlen = va_arg(ap, int);
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va_end(ap);
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ret=gre_input2(m,hlen,IPPROTO_GRE);
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/*
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* ret == 0 : packet not processed, but input from here
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* means no matching tunnel that is up is found,
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* so we can just free the mbuf and return
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*/
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if (ret==0)
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m_freem(m);
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}
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/*
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* decapsulate.
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* Does the real work and is called from gre_input() (above)
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* and also from ipip_input() (ip_mroute.c)
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* returns 0 if packet is not yet processed
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* and 1 if it needs no further processing
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* proto is the protocol number of the "calling" foo_input()
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* routine.
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*/
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int
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gre_input2(struct mbuf *m ,int hlen,u_char proto)
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{
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register struct greip *gip = mtod(m, struct greip *);
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register int s;
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register struct ifqueue *ifq;
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struct gre_softc *sc = NULL;
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u_short flags;
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int i;
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i=match_tunnel(m,proto);
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if (i!=-1) { /* found matching tunnel that is up */
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sc=&gre_softc[i];
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sc->sc_if.if_ipackets++;
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sc->sc_if.if_ibytes+=m->m_pkthdr.len;
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} else { /* no matching tunnel or match, but tunnel down */
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return 0;
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}
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switch (proto) {
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case IPPROTO_GRE:
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hlen += sizeof (struct gre_h);
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/* process GRE flags as packet can be of variable len */
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flags = ntohs(gip->gi_flags);
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/* Checksum & Offset are present */
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if ((flags & GRE_CP) | (flags & GRE_RP))
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hlen += 4;
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/* We don't support routing fields (variable length) */
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if (flags & GRE_RP)
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return(0);
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if (flags & GRE_KP)
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hlen += 4;
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if (flags & GRE_SP)
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hlen +=4;
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switch (ntohs(gip->gi_ptype)) { /* ethertypes */
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case ETHERTYPE_IP: /* shouldn't need a schednetisr(), as */
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ifq = &ipintrq; /* we are in ip_input */
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break;
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#ifdef NS
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case ETHERTYPE_NS:
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ifq = &nsintrq;
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schednetisr(NETISR_NS);
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break;
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#endif
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#ifdef NETATALK
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case ETHERTYPE_AT:
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ifq = &atintrq1;
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schednetisr(NETISR_ATALK);
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break;
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#endif
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case ETHERTYPE_IPV6:
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/* FALLTHROUGH */
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default: /* others not yet supported */
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return(0);
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}
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break;
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case IPPROTO_IPIP:
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ifq = &ipintrq;
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break;
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default:
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/* others not yet supported */
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return(0);
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}
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m->m_data += hlen;
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m->m_len -= hlen;
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m->m_pkthdr.len -= hlen;
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s = splimp(); /* possible */
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if (IF_QFULL(ifq)) {
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IF_DROP(ifq);
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m_freem(m);
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} else {
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IF_ENQUEUE(ifq,m);
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}
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splx(s);
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return(1); /* packet is done, no further processing needed */
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}
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/*
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* input routine for IPPRPOTO_MOBILE
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* This is a little bit diffrent from the other modes, as the
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* encapsulating header was not prepended, but instead inserted
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* between IP header and payload
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*/
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void
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#if __STDC__
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gre_mobile_input(struct mbuf *m, ...)
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#else
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gre_mobile_input(m, va_alist)
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struct mbuf *m;
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va_dcl
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#endif
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{
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register struct ip *ip = mtod(m, struct ip *);
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register struct mobip_h *mip = mtod(m, struct mobip_h *);
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register struct ifqueue *ifq;
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struct gre_softc *sc = NULL;
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register int hlen,s;
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va_list ap;
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u_char osrc=0;
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int i,msiz;
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va_start(ap,m);
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hlen=va_arg(ap, int);
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va_end(ap);
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i=match_tunnel(m,IPPROTO_MOBILE);
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if (i!=-1) {
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sc=&gre_softc[i];
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/* found matching tunnel that is up */
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sc->sc_if.if_ipackets++;
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sc->sc_if.if_ibytes+=m->m_pkthdr.len;
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} else { /* no matching tunnel or match, but tunnel down */
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m_freem(m);
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return;
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}
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if(ntohs(mip->mh.proto) & MOB_H_SBIT) {
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osrc=1;
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msiz=MOB_H_SIZ_L;
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mip->mi.ip_src.s_addr=mip->mh.osrc;
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} else {
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msiz=MOB_H_SIZ_S;
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}
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mip->mi.ip_dst.s_addr=mip->mh.odst;
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mip->mi.ip_p=(ntohs(mip->mh.proto) >> 8);
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if (gre_in_cksum((u_short*)&mip->mh,msiz)!=0) {
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m_freem(m);
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return;
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}
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memmove(ip+(ip->ip_hl<<2),ip+(ip->ip_hl<<2)+msiz,
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m->m_len-msiz-(ip->ip_hl<<2));
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m->m_len-=msiz;
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ip->ip_len-=msiz;
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ip->ip_len+=ip->ip_hl<<2; /* ip input "stripped" this off */
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HTONS(ip->ip_len);
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m->m_pkthdr.len-=msiz;
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ip->ip_sum=0;
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ip->ip_sum=in_cksum(m,(ip->ip_hl << 2));
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ifq = &ipintrq;
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s = splimp(); /* possible */
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if (IF_QFULL(ifq)) {
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IF_DROP(ifq);
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m_freem(m);
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} else {
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IF_ENQUEUE(ifq,m);
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}
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splx(s);
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}
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#ifndef MROUTING
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/*
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* Well if MROUTING is not defined, the ipip_input function in
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* ip_mroute.c gets never called, so IPIP packets coming over the
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* tunnel can't be processed. (Not exactly true. They go to raw ip
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* that also can't cope ).
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*/
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void
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#if __STDC__
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gre_ipip_input(struct mbuf *m, ...)
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#else
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ipip_input(m, va_alist)
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struct mbuf *m;
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va_dcl
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#endif
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{
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register int hlen;
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va_list ap;
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va_start(ap, m);
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hlen = va_arg(ap, int);
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va_end(ap);
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/*
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* return == 0 means, that the packet is not preocessed, but
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* as we are the only ones to decapsulate IPIP, and are not able,
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* then we can just dump it.
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*/
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if(gre_input2(m,hlen,IPPROTO_IPIP)==0)
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m_freem(m);
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}
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#endif /* ifndef MROUTING */
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/*
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* go through tunnel interfaces and see if we have a matching one
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* returns i where gre_softc[i] is the match on success, -1 otherwise.
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*/
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static int
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match_tunnel(struct mbuf *m,u_char proto)
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{
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register struct ip *ip = mtod(m, struct ip *);
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register int i,r;
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struct gre_softc *sc = NULL;
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i=0;
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do {
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sc=&gre_softc[i];
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if((sc->g_dst.s_addr == ip->ip_src.s_addr) &&
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(sc->g_src.s_addr == ip->ip_dst.s_addr))
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break;
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i++;
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} while(i<NGRE);
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if ((i<NGRE) && ((sc->sc_if.if_flags & IFF_UP) == IFF_UP)) {
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r=i;
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} else {
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r=-1;
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}
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if (sc->g_proto != proto) {
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r=-1;
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}
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return(r);
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}
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#endif /* if NGRE > 0 */
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