33d2961d9a
When tunneling interface is going to insert mbuf into netisr queue after stripping outer header, consider it as new packet and clear the protocols flags. This fixes problems when IPSEC traffic goes through various tunnels and router doesn't send ICMP/ICMPv6 errors. PR: 174602 Sponsored by: Yandex LLC
336 lines
8.4 KiB
C
336 lines
8.4 KiB
C
/* $NetBSD: ip_gre.c,v 1.29 2003/09/05 23:02:43 itojun Exp $ */
|
|
|
|
/*-
|
|
* 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>
|
|
*
|
|
* IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.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.
|
|
*
|
|
* 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 <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_inet.h"
|
|
#include "opt_atalk.h"
|
|
#include "opt_inet6.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 requires INET"
|
|
#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 struct mbuf *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
|
|
gre_input(struct mbuf *m, int off)
|
|
{
|
|
int proto;
|
|
|
|
proto = (mtod(m, struct ip *))->ip_p;
|
|
|
|
m = gre_input2(m, off, proto);
|
|
|
|
/*
|
|
* If no matching tunnel that is up is found. We inject
|
|
* the mbuf to raw ip socket to see if anyone picks it up.
|
|
*/
|
|
if (m != NULL)
|
|
rip_input(m, off);
|
|
}
|
|
|
|
/*
|
|
* Decapsulate. Does the real work and is called from gre_input()
|
|
* (above). Returns an mbuf back if packet is not yet processed,
|
|
* and NULL if it needs no further processing. proto is the protocol
|
|
* number of the "calling" foo_input() routine.
|
|
*/
|
|
static struct mbuf *
|
|
gre_input2(struct mbuf *m ,int hlen, u_char proto)
|
|
{
|
|
struct greip *gip;
|
|
int isr;
|
|
struct gre_softc *sc;
|
|
u_int16_t flags;
|
|
u_int32_t af;
|
|
|
|
if ((sc = gre_lookup(m, proto)) == NULL) {
|
|
/* No matching tunnel or tunnel is down. */
|
|
return (m);
|
|
}
|
|
|
|
if (m->m_len < sizeof(*gip)) {
|
|
m = m_pullup(m, sizeof(*gip));
|
|
if (m == NULL)
|
|
return (NULL);
|
|
}
|
|
gip = mtod(m, struct greip *);
|
|
|
|
GRE2IFP(sc)->if_ipackets++;
|
|
GRE2IFP(sc)->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 (m);
|
|
if (flags & GRE_KP)
|
|
hlen += 4;
|
|
if (flags & GRE_SP)
|
|
hlen += 4;
|
|
|
|
switch (ntohs(gip->gi_ptype)) { /* ethertypes */
|
|
case WCCP_PROTOCOL_TYPE:
|
|
if (sc->wccp_ver == WCCP_V2)
|
|
hlen += 4;
|
|
/* FALLTHROUGH */
|
|
case ETHERTYPE_IP: /* shouldn't need a schednetisr(), */
|
|
isr = NETISR_IP;/* as we are in ip_input */
|
|
af = AF_INET;
|
|
break;
|
|
#ifdef INET6
|
|
case ETHERTYPE_IPV6:
|
|
isr = NETISR_IPV6;
|
|
af = AF_INET6;
|
|
break;
|
|
#endif
|
|
#ifdef NETATALK
|
|
case ETHERTYPE_ATALK:
|
|
isr = NETISR_ATALK1;
|
|
af = AF_APPLETALK;
|
|
break;
|
|
#endif
|
|
default:
|
|
/* Others not yet supported. */
|
|
return (m);
|
|
}
|
|
break;
|
|
default:
|
|
/* Others not yet supported. */
|
|
return (m);
|
|
}
|
|
|
|
if (hlen > m->m_pkthdr.len) {
|
|
m_freem(m);
|
|
return (NULL);
|
|
}
|
|
/* Unlike NetBSD, in FreeBSD m_adj() adjusts m->m_pkthdr.len as well */
|
|
m_adj(m, hlen);
|
|
|
|
if (bpf_peers_present(GRE2IFP(sc)->if_bpf)) {
|
|
bpf_mtap2(GRE2IFP(sc)->if_bpf, &af, sizeof(af), m);
|
|
}
|
|
|
|
if ((GRE2IFP(sc)->if_flags & IFF_MONITOR) != 0) {
|
|
m_freem(m);
|
|
return(NULL);
|
|
}
|
|
|
|
m->m_pkthdr.rcvif = GRE2IFP(sc);
|
|
m_clrprotoflags(m);
|
|
netisr_queue(isr, m);
|
|
|
|
/* Packet is done, no further processing needed. */
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
gre_mobile_input(struct mbuf *m, int hlen)
|
|
{
|
|
struct ip *ip;
|
|
struct mobip_h *mip;
|
|
struct gre_softc *sc;
|
|
int msiz;
|
|
|
|
if ((sc = gre_lookup(m, IPPROTO_MOBILE)) == NULL) {
|
|
/* No matching tunnel or tunnel is down. */
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
if (m->m_len < sizeof(*mip)) {
|
|
m = m_pullup(m, sizeof(*mip));
|
|
if (m == NULL)
|
|
return;
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
mip = mtod(m, struct mobip_h *);
|
|
|
|
GRE2IFP(sc)->if_ipackets++;
|
|
GRE2IFP(sc)->if_ibytes += m->m_pkthdr.len;
|
|
|
|
if (ntohs(mip->mh.proto) & MOB_H_SBIT) {
|
|
msiz = MOB_H_SIZ_L;
|
|
mip->mi.ip_src.s_addr = mip->mh.osrc;
|
|
} else
|
|
msiz = MOB_H_SIZ_S;
|
|
|
|
if (m->m_len < (ip->ip_hl << 2) + msiz) {
|
|
m = m_pullup(m, (ip->ip_hl << 2) + msiz);
|
|
if (m == NULL)
|
|
return;
|
|
ip = mtod(m, struct ip *);
|
|
mip = mtod(m, struct mobip_h *);
|
|
}
|
|
|
|
mip->mi.ip_dst.s_addr = mip->mh.odst;
|
|
mip->mi.ip_p = (ntohs(mip->mh.proto) >> 8);
|
|
|
|
if (gre_in_cksum((u_int16_t *)&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
|
|
* decreased by the lengh of IP header, however, ip_input()
|
|
* expects it to be full size of IP packet, so adjust accordingly.
|
|
*/
|
|
ip->ip_len = htons(ntohs(ip->ip_len) + sizeof(struct ip) - msiz);
|
|
|
|
ip->ip_sum = 0;
|
|
ip->ip_sum = in_cksum(m, (ip->ip_hl << 2));
|
|
|
|
if (bpf_peers_present(GRE2IFP(sc)->if_bpf)) {
|
|
u_int32_t af = AF_INET;
|
|
bpf_mtap2(GRE2IFP(sc)->if_bpf, &af, sizeof(af), m);
|
|
}
|
|
|
|
if ((GRE2IFP(sc)->if_flags & IFF_MONITOR) != 0) {
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
m->m_pkthdr.rcvif = GRE2IFP(sc);
|
|
|
|
netisr_queue(NETISR_IP, m);
|
|
}
|
|
|
|
/*
|
|
* Find the gre interface associated with our src/dst/proto set.
|
|
*
|
|
* XXXRW: Need some sort of drain/refcount mechanism so that the softc
|
|
* reference remains valid after it's returned from gre_lookup(). Right
|
|
* now, I'm thinking it should be reference-counted with a gre_dropref()
|
|
* when the caller is done with the softc. This is complicated by how
|
|
* to handle destroying the gre softc; probably using a gre_drain() in
|
|
* in_gre.c during destroy.
|
|
*/
|
|
static struct gre_softc *
|
|
gre_lookup(struct mbuf *m, u_int8_t proto)
|
|
{
|
|
struct ip *ip = mtod(m, struct ip *);
|
|
struct gre_softc *sc;
|
|
|
|
mtx_lock(&gre_mtx);
|
|
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) &&
|
|
((GRE2IFP(sc)->if_flags & IFF_UP) != 0)) {
|
|
mtx_unlock(&gre_mtx);
|
|
return (sc);
|
|
}
|
|
}
|
|
mtx_unlock(&gre_mtx);
|
|
|
|
return (NULL);
|
|
}
|