#ifndef __NET_IPIP_H#define __NET_IPIP_H 1 #include <linux/if_tunnel.h>#include <net/ip.h> /* Keep error state on tunnel for 30 sec */#define IPTUNNEL_ERR_TIMEO	(30*HZ) /* 6rd prefix/relay information */struct ip_tunnel_6rd_parm {	struct in6_addr		prefix;	__be32			relay_prefix;	u16			prefixlen;	u16			relay_prefixlen;}; struct ip_tunnel {	struct ip_tunnel __rcu	*next;	struct net_device	*dev; 	int			err_count;	/* Number of arrived ICMP errors */	unsigned long		err_time;	/* Time when the last ICMP error arrived */ 	/* These four fields used only by GRE */	__u32			i_seqno;	/* The last seen seqno	*/	__u32			o_seqno;	/* The last output seqno */	int			hlen;		/* Precalculated GRE header length */	int			mlink; 	struct ip_tunnel_parm	parms; 	/* for SIT */#ifdef CONFIG_IPV6_SIT_6RD	struct ip_tunnel_6rd_parm	ip6rd;#endif	struct ip_tunnel_prl_entry __rcu *prl;		/* potential router list */	unsigned int			prl_count;	/* # of entries in PRL */}; struct ip_tunnel_prl_entry {	struct ip_tunnel_prl_entry __rcu *next;	__be32				addr;	u16				flags;	struct rcu_head			rcu_head;}; #define __IPTUNNEL_XMIT(stats1, stats2) do {				\	int err;							\	int pkt_len = skb->len - skb_transport_offset(skb);		\									\	skb->ip_summed = CHECKSUM_NONE;					\	ip_select_ident(iph, &rt->dst, NULL);				\									\	err = ip_local_out(skb);					\	if (likely(net_xmit_eval(err) == 0)) {				\		(stats1)->tx_bytes += pkt_len;				\		(stats1)->tx_packets++;					\	} else {							\		(stats2)->tx_errors++;					\		(stats2)->tx_aborted_errors++;				\	}								\} while (0) #define IPTUNNEL_XMIT() __IPTUNNEL_XMIT(txq, stats) #endif