352 lines
8.4 KiB
C
352 lines
8.4 KiB
C
/* $NetBSD: ip_gre.c,v 1.21 2002/08/14 00:23:30 itojun Exp $ */
|
|
/* $FreeBSD$ */
|
|
|
|
/*
|
|
* Copyright (c) 1998 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Heiko W.Rupp <hwr@pilhuhn.de>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* deencapsulate tunneled packets and send them on
|
|
* output half is in net/if_gre.[ch]
|
|
* This currently handles IPPROTO_GRE, IPPROTO_MOBILE
|
|
*/
|
|
|
|
#include "opt_inet.h"
|
|
#include "opt_ns.h"
|
|
#include "opt_atalk.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/time.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/syslog.h>
|
|
#include <net/bpf.h>
|
|
#include <net/ethernet.h>
|
|
#include <net/if.h>
|
|
#include <net/netisr.h>
|
|
#include <net/route.h>
|
|
#include <net/raw_cb.h>
|
|
|
|
#ifdef INET
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_var.h>
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/ip.h>
|
|
#include <netinet/ip_var.h>
|
|
#include <netinet/ip_gre.h>
|
|
#include <machine/in_cksum.h>
|
|
#else
|
|
#error ip_gre input without IP?
|
|
#endif
|
|
|
|
#ifdef NS
|
|
#include <netns/ns.h>
|
|
#include <netns/ns_if.h>
|
|
#endif
|
|
|
|
#ifdef NETATALK
|
|
#include <netatalk/at.h>
|
|
#include <netatalk/at_var.h>
|
|
#include <netatalk/at_extern.h>
|
|
#endif
|
|
|
|
/* Needs IP headers. */
|
|
#include <net/if_gre.h>
|
|
|
|
#include <machine/stdarg.h>
|
|
|
|
#if 1
|
|
void gre_inet_ntoa(struct in_addr in); /* XXX */
|
|
#endif
|
|
|
|
static struct gre_softc *gre_lookup(struct mbuf *, u_int8_t);
|
|
|
|
static int gre_input2(struct mbuf *, int, u_char);
|
|
|
|
/*
|
|
* De-encapsulate a packet and feed it back through ip input (this
|
|
* routine is called whenever IP gets a packet with proto type
|
|
* IPPROTO_GRE and a local destination address).
|
|
* This really is simple
|
|
*/
|
|
void
|
|
#if __STDC__
|
|
gre_input(struct mbuf *m, ...)
|
|
#else
|
|
gre_input(m, va_alist)
|
|
struct mbuf *m;
|
|
va_dcl
|
|
#endif
|
|
{
|
|
int off, ret, proto;
|
|
va_list ap;
|
|
|
|
va_start(ap, m);
|
|
off = va_arg(ap, int);
|
|
va_end(ap);
|
|
proto = (mtod(m, struct ip *))->ip_p;
|
|
|
|
ret = gre_input2(m, off, proto);
|
|
/*
|
|
* ret == 0 : packet not processed, meaning that
|
|
* no matching tunnel that is up is found.
|
|
* we inject it to raw ip socket to see if anyone picks it up.
|
|
*/
|
|
if (ret == 0)
|
|
rip_input(m, off);
|
|
}
|
|
|
|
/*
|
|
* decapsulate.
|
|
* Does the real work and is called from gre_input() (above)
|
|
* returns 0 if packet is not yet processed
|
|
* and 1 if it needs no further processing
|
|
* proto is the protocol number of the "calling" foo_input()
|
|
* routine.
|
|
*/
|
|
|
|
static int
|
|
gre_input2(struct mbuf *m ,int hlen, u_char proto)
|
|
{
|
|
struct greip *gip = mtod(m, struct greip *);
|
|
int s;
|
|
struct ifqueue *ifq;
|
|
struct gre_softc *sc;
|
|
u_short flags;
|
|
|
|
if ((sc = gre_lookup(m, proto)) == NULL) {
|
|
/* No matching tunnel or tunnel is down. */
|
|
return (0);
|
|
}
|
|
|
|
sc->sc_if.if_ipackets++;
|
|
sc->sc_if.if_ibytes += m->m_pkthdr.len;
|
|
|
|
switch (proto) {
|
|
case IPPROTO_GRE:
|
|
hlen += sizeof (struct gre_h);
|
|
|
|
/* process GRE flags as packet can be of variable len */
|
|
flags = ntohs(gip->gi_flags);
|
|
|
|
/* Checksum & Offset are present */
|
|
if ((flags & GRE_CP) | (flags & GRE_RP))
|
|
hlen += 4;
|
|
/* We don't support routing fields (variable length) */
|
|
if (flags & GRE_RP)
|
|
return(0);
|
|
if (flags & GRE_KP)
|
|
hlen += 4;
|
|
if (flags & GRE_SP)
|
|
hlen +=4;
|
|
|
|
switch (ntohs(gip->gi_ptype)) { /* ethertypes */
|
|
case ETHERTYPE_IP: /* shouldn't need a schednetisr(), as */
|
|
ifq = &ipintrq; /* we are in ip_input */
|
|
break;
|
|
#ifdef NS
|
|
case ETHERTYPE_NS:
|
|
ifq = &nsintrq;
|
|
schednetisr(NETISR_NS);
|
|
break;
|
|
#endif
|
|
#ifdef NETATALK
|
|
case ETHERTYPE_ATALK:
|
|
ifq = &atintrq1;
|
|
schednetisr(NETISR_ATALK);
|
|
break;
|
|
#endif
|
|
case ETHERTYPE_IPV6:
|
|
/* FALLTHROUGH */
|
|
default: /* others not yet supported */
|
|
return(0);
|
|
}
|
|
break;
|
|
default:
|
|
/* others not yet supported */
|
|
return(0);
|
|
}
|
|
|
|
m->m_data += hlen;
|
|
m->m_len -= hlen;
|
|
m->m_pkthdr.len -= hlen;
|
|
|
|
if (sc->sc_if.if_bpf) {
|
|
struct mbuf m0;
|
|
u_int32_t af = AF_INET;
|
|
|
|
m0.m_next = m;
|
|
m0.m_len = 4;
|
|
m0.m_data = (char *)⁡
|
|
|
|
BPF_MTAP(&(sc->sc_if), &m0);
|
|
}
|
|
|
|
m->m_pkthdr.rcvif = &sc->sc_if;
|
|
|
|
s = splnet(); /* possible */
|
|
if (_IF_QFULL(ifq)) {
|
|
_IF_DROP(ifq);
|
|
m_freem(m);
|
|
} else {
|
|
IF_ENQUEUE(ifq,m);
|
|
}
|
|
splx(s);
|
|
|
|
return(1); /* packet is done, no further processing needed */
|
|
}
|
|
|
|
/*
|
|
* input routine for IPPRPOTO_MOBILE
|
|
* This is a little bit diffrent from the other modes, as the
|
|
* encapsulating header was not prepended, but instead inserted
|
|
* between IP header and payload
|
|
*/
|
|
|
|
void
|
|
#if __STDC__
|
|
gre_mobile_input(struct mbuf *m, ...)
|
|
#else
|
|
gre_mobile_input(m, va_alist)
|
|
struct mbuf *m;
|
|
va_dcl
|
|
#endif
|
|
{
|
|
struct ip *ip = mtod(m, struct ip *);
|
|
struct mobip_h *mip = mtod(m, struct mobip_h *);
|
|
struct ifqueue *ifq;
|
|
struct gre_softc *sc;
|
|
int hlen,s;
|
|
va_list ap;
|
|
u_char osrc = 0;
|
|
int msiz;
|
|
|
|
va_start(ap,m);
|
|
hlen = va_arg(ap, int);
|
|
va_end(ap);
|
|
|
|
if ((sc = gre_lookup(m, IPPROTO_MOBILE)) == NULL) {
|
|
/* No matching tunnel or tunnel is down. */
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
sc->sc_if.if_ipackets++;
|
|
sc->sc_if.if_ibytes += m->m_pkthdr.len;
|
|
|
|
if(ntohs(mip->mh.proto) & MOB_H_SBIT) {
|
|
osrc = 1;
|
|
msiz = MOB_H_SIZ_L;
|
|
mip->mi.ip_src.s_addr = mip->mh.osrc;
|
|
} else {
|
|
msiz = MOB_H_SIZ_S;
|
|
}
|
|
mip->mi.ip_dst.s_addr = mip->mh.odst;
|
|
mip->mi.ip_p = (ntohs(mip->mh.proto) >> 8);
|
|
|
|
if (gre_in_cksum((u_short*)&mip->mh,msiz) != 0) {
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
bcopy((caddr_t)(ip) + (ip->ip_hl << 2) + msiz, (caddr_t)(ip) +
|
|
(ip->ip_hl << 2), m->m_len - msiz - (ip->ip_hl << 2));
|
|
m->m_len -= msiz;
|
|
m->m_pkthdr.len -= msiz;
|
|
|
|
/*
|
|
* On FreeBSD, rip_input() supplies us with ip->ip_len
|
|
* already converted into host byteorder and also decreases
|
|
* it by the lengh of IP header, however, ip_input() expects
|
|
* that this field is in the original format (network byteorder
|
|
* and full size of IP packet), so that adjust accordingly.
|
|
*/
|
|
ip->ip_len = htons(ip->ip_len + sizeof(struct ip) - msiz);
|
|
|
|
ip->ip_sum = 0;
|
|
ip->ip_sum = in_cksum(m, (ip->ip_hl << 2));
|
|
|
|
if (sc->sc_if.if_bpf) {
|
|
struct mbuf m0;
|
|
u_int af = AF_INET;
|
|
|
|
m0.m_next = m;
|
|
m0.m_len = 4;
|
|
m0.m_data = (char *)⁡
|
|
|
|
BPF_MTAP(&(sc->sc_if), &m0);
|
|
}
|
|
|
|
m->m_pkthdr.rcvif = &sc->sc_if;
|
|
|
|
ifq = &ipintrq;
|
|
s = splnet(); /* possible */
|
|
if (_IF_QFULL(ifq)) {
|
|
_IF_DROP(ifq);
|
|
m_freem(m);
|
|
} else {
|
|
IF_ENQUEUE(ifq,m);
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* Find the gre interface associated with our src/dst/proto set.
|
|
*/
|
|
static struct gre_softc *
|
|
gre_lookup(m, proto)
|
|
struct mbuf *m;
|
|
u_int8_t proto;
|
|
{
|
|
struct ip *ip = mtod(m, struct ip *);
|
|
struct gre_softc *sc;
|
|
|
|
for (sc = LIST_FIRST(&gre_softc_list); sc != NULL;
|
|
sc = LIST_NEXT(sc, sc_list)) {
|
|
if ((sc->g_dst.s_addr == ip->ip_src.s_addr) &&
|
|
(sc->g_src.s_addr == ip->ip_dst.s_addr) &&
|
|
(sc->g_proto == proto) &&
|
|
((sc->sc_if.if_flags & IFF_UP) != 0))
|
|
return (sc);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|