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/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* Copyright (c) 2014 Andrey V. Elsukov <ae@FreeBSD.org>
* 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.
*
* $NetBSD: ip_gre.c,v 1.29 2003/09/05 23:02:43 itojun Exp $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet.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/lock.h>
#include <sys/rmlock.h>
#include <sys/sysctl.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/ip_encap.h>
#include <netinet/ip_var.h>
#ifdef INET6
#include <netinet/ip6.h>
#endif
#include <net/if_gre.h>
extern struct domain inetdomain;
static const struct protosw in_gre_protosw = {
.pr_type = SOCK_RAW,
.pr_domain = &inetdomain,
.pr_protocol = IPPROTO_GRE,
.pr_flags = PR_ATOMIC|PR_ADDR,
.pr_input = gre_input,
.pr_output = rip_output,
.pr_ctlinput = rip_ctlinput,
.pr_ctloutput = rip_ctloutput,
.pr_usrreqs = &rip_usrreqs
};
#define GRE_TTL 30
VNET_DEFINE(int, ip_gre_ttl) = GRE_TTL;
#define V_ip_gre_ttl VNET(ip_gre_ttl)
SYSCTL_INT(_net_inet_ip, OID_AUTO, grettl, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(ip_gre_ttl), 0, "");
static int
in_gre_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
{
GRE_RLOCK_TRACKER;
struct gre_softc *sc;
struct ip *ip;
sc = (struct gre_softc *)arg;
if ((GRE2IFP(sc)->if_flags & IFF_UP) == 0)
return (0);
M_ASSERTPKTHDR(m);
/*
* We expect that payload contains at least IPv4
* or IPv6 packet.
*/
if (m->m_pkthdr.len < sizeof(struct greip) + sizeof(struct ip))
return (0);
GRE_RLOCK(sc);
if (sc->gre_family == 0)
goto bad;
KASSERT(sc->gre_family == AF_INET,
("wrong gre_family: %d", sc->gre_family));
ip = mtod(m, struct ip *);
if (sc->gre_oip.ip_src.s_addr != ip->ip_dst.s_addr ||
sc->gre_oip.ip_dst.s_addr != ip->ip_src.s_addr)
goto bad;
GRE_RUNLOCK(sc);
return (32 * 2);
bad:
GRE_RUNLOCK(sc);
return (0);
}
int
in_gre_output(struct mbuf *m, int af, int hlen)
{
struct greip *gi;
gi = mtod(m, struct greip *);
switch (af) {
case AF_INET:
/*
* gre_transmit() has used M_PREPEND() that doesn't guarantee
* m_data is contiguous more than hlen bytes. Use m_copydata()
* here to avoid m_pullup().
*/
m_copydata(m, hlen + offsetof(struct ip, ip_tos),
sizeof(u_char), &gi->gi_ip.ip_tos);
m_copydata(m, hlen + offsetof(struct ip, ip_id),
sizeof(u_short), (caddr_t)&gi->gi_ip.ip_id);
break;
#ifdef INET6
case AF_INET6:
gi->gi_ip.ip_tos = 0; /* XXX */
ip_fillid(&gi->gi_ip);
break;
#endif
}
gi->gi_ip.ip_ttl = V_ip_gre_ttl;
gi->gi_ip.ip_len = htons(m->m_pkthdr.len);
return (ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL));
}
int
in_gre_attach(struct gre_softc *sc)
{
KASSERT(sc->gre_ecookie == NULL, ("gre_ecookie isn't NULL"));
sc->gre_ecookie = encap_attach_func(AF_INET, IPPROTO_GRE,
in_gre_encapcheck, &in_gre_protosw, sc);
if (sc->gre_ecookie == NULL)
return (EEXIST);
return (0);
}
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