#ifndef __NET_IPIP_H#define __NET_IPIP_H 1 #include <linux/if_tunnel.h> /* Keep error state on tunnel for 30 sec */#define IPTUNNEL_ERR_TIMEO	(30*HZ) struct ip_tunnel{	struct ip_tunnel	*next;	struct net_device	*dev;	struct net_device_stats	stat; 	int			recursion;	/* Depth of hard_start_xmit recursion */	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;}; #define IPTUNNEL_XMIT() do {						\	int err;							\	int pkt_len = skb->len;						\									\	skb->ip_summed = CHECKSUM_NONE;					\	iph->tot_len = htons(skb->len);					\	ip_select_ident(iph, &rt->u.dst, NULL);				\	ip_send_check(iph);						\									\	err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, dst_output);\	if (net_xmit_eval(err) == 0) {					\		stats->tx_bytes += pkt_len;				\		stats->tx_packets++;					\	} else {							\		stats->tx_errors++;					\		stats->tx_aborted_errors++;				\	}								\} while (0) #endif