/*
 * Copyright (c) 2007-2012 Nicira, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 */

#ifndef TUNNEL_H
#define TUNNEL_H 1

#include <linux/version.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>

#include "flow.h"
#include "vport.h"

struct rtable *find_route(struct net *net,
			  __be32 *saddr, __be32 daddr, u8 ipproto,
			  u8 tos, u32 skb_mark);

u16 ovs_tnl_get_src_port(struct sk_buff *skb);

int ovs_tnl_send(struct vport *vport, struct sk_buff *skb,
		 u8 ipproto, int tunnel_hlen,
		 void (*build_header)(const struct vport *,
				      struct sk_buff *,
				      int tunnel_hlen));

void ovs_tnl_rcv(struct vport *vport, struct sk_buff *skb,
		 struct ovs_key_ipv4_tunnel *tun_key);

static inline void tnl_tun_key_init(struct ovs_key_ipv4_tunnel *tun_key,
					 const struct iphdr *iph, __be64 tun_id,
					 __be16 tun_flags)
{
	tun_key->tun_id = tun_id;
	tun_key->ipv4_src = iph->saddr;
	tun_key->ipv4_dst = iph->daddr;
	tun_key->ipv4_tos = iph->tos;
	tun_key->ipv4_ttl = iph->ttl;
	tun_key->tun_flags = tun_flags;

	/* clear struct padding. */
	memset((unsigned char*) tun_key + OVS_TUNNEL_KEY_SIZE, 0,
	       sizeof(*tun_key) - OVS_TUNNEL_KEY_SIZE);
}

#endif /* TUNNEL_H */