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1#ifndef _NET_IP6_TUNNEL_H
2#define _NET_IP6_TUNNEL_H
3
4#include <linux/ipv6.h>
5#include <linux/netdevice.h>
6#include <linux/if_tunnel.h>
7#include <linux/ip6_tunnel.h>
8#include <net/ip_tunnels.h>
9
10#define IP6TUNNEL_ERR_TIMEO (30*HZ)
11
12/* capable of sending packets */
13#define IP6_TNL_F_CAP_XMIT 0x10000
14/* capable of receiving packets */
15#define IP6_TNL_F_CAP_RCV 0x20000
16/* determine capability on a per-packet basis */
17#define IP6_TNL_F_CAP_PER_PACKET 0x40000
18
19struct __ip6_tnl_parm {
20 char name[IFNAMSIZ]; /* name of tunnel device */
21 int link; /* ifindex of underlying L2 interface */
22 __u8 proto; /* tunnel protocol */
23 __u8 encap_limit; /* encapsulation limit for tunnel */
24 __u8 hop_limit; /* hop limit for tunnel */
25 __be32 flowinfo; /* traffic class and flowlabel for tunnel */
26 __u32 flags; /* tunnel flags */
27 struct in6_addr laddr; /* local tunnel end-point address */
28 struct in6_addr raddr; /* remote tunnel end-point address */
29
30 __be16 i_flags;
31 __be16 o_flags;
32 __be32 i_key;
33 __be32 o_key;
34};
35
36struct ip6_tnl_dst {
37 seqlock_t lock;
38 struct dst_entry __rcu *dst;
39 u32 cookie;
40};
41
42/* IPv6 tunnel */
43struct ip6_tnl {
44 struct ip6_tnl __rcu *next; /* next tunnel in list */
45 struct net_device *dev; /* virtual device associated with tunnel */
46 struct net *net; /* netns for packet i/o */
47 struct __ip6_tnl_parm parms; /* tunnel configuration parameters */
48 struct flowi fl; /* flowi template for xmit */
49 struct ip6_tnl_dst __percpu *dst_cache; /* cached dst */
50
51 int err_count;
52 unsigned long err_time;
53
54 /* These fields used only by GRE */
55 __u32 i_seqno; /* The last seen seqno */
56 __u32 o_seqno; /* The last output seqno */
57 int hlen; /* Precalculated GRE header length */
58 int mlink;
59};
60
61/* Tunnel encapsulation limit destination sub-option */
62
63struct ipv6_tlv_tnl_enc_lim {
64 __u8 type; /* type-code for option */
65 __u8 length; /* option length */
66 __u8 encap_limit; /* tunnel encapsulation limit */
67} __packed;
68
69struct dst_entry *ip6_tnl_dst_get(struct ip6_tnl *t);
70int ip6_tnl_dst_init(struct ip6_tnl *t);
71void ip6_tnl_dst_destroy(struct ip6_tnl *t);
72void ip6_tnl_dst_reset(struct ip6_tnl *t);
73void ip6_tnl_dst_set(struct ip6_tnl *t, struct dst_entry *dst);
74int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
75 const struct in6_addr *raddr);
76int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
77 const struct in6_addr *raddr);
78__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw);
79__u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
80 const struct in6_addr *raddr);
81struct net *ip6_tnl_get_link_net(const struct net_device *dev);
82int ip6_tnl_get_iflink(const struct net_device *dev);
83
84#ifdef CONFIG_INET
85static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
86 struct net_device *dev)
87{
88 int pkt_len, err;
89
90 pkt_len = skb->len - skb_inner_network_offset(skb);
91 err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb);
92 if (unlikely(net_xmit_eval(err)))
93 pkt_len = -1;
94 iptunnel_xmit_stats(dev, pkt_len);
95}
96#endif
97#endif