1 #ifndef __NET_IPIP_H
2 #define __NET_IPIP_H 1
3
4 #include <linux/if_tunnel.h>
5
6 /* Keep error state on tunnel for 30 sec */
7 #define IPTUNNEL_ERR_TIMEO (30*HZ)
8
9 struct ip_tunnel
10 {
11 struct ip_tunnel *next;
12 struct net_device *dev;
13 struct net_device_stats stat;
14
15 int recursion; /* Depth of hard_start_xmit recursion */
16 int err_count; /* Number of arrived ICMP errors */
17 unsigned long err_time; /* Time when the last ICMP error arrived */
18
19 /* These four fields used only by GRE */
20 __u32 i_seqno; /* The last seen seqno */
21 __u32 o_seqno; /* The last output seqno */
22 int hlen; /* Precalculated GRE header length */
23 int mlink;
24
25 struct ip_tunnel_parm parms;
26 };
27
28 #define IPTUNNEL_XMIT() do { \
29 int err; \
30 int pkt_len = skb->len; \
31 \
32 iph->tot_len = htons(skb->len); \
33 ip_select_ident(iph, &rt->u.dst); \
34 ip_send_check(iph); \
35 \
36 err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, do_ip_send); \
37 if (err == NET_XMIT_SUCCESS || err == NET_XMIT_CN) { \
38 stats->tx_bytes += pkt_len; \
39 stats->tx_packets++; \
40 } else { \
41 stats->tx_errors++; \
42 stats->tx_aborted_errors++; \
43 } \
44 } while (0)
45
46
47 extern int ipip_init(void);
48 extern int ipgre_init(void);
49 extern int sit_init(void);
50 extern void sit_cleanup(void);
51
52 #endif
53
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