1 #ifndef _NET_IP6_TUNNEL_H
2 #define _NET_IP6_TUNNEL_H
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 #include <net/dst_cache.h>
11 #define IP6TUNNEL_ERR_TIMEO (30*HZ)
13 /* capable of sending packets */
14 #define IP6_TNL_F_CAP_XMIT 0x10000
15 /* capable of receiving packets */
16 #define IP6_TNL_F_CAP_RCV 0x20000
17 /* determine capability on a per-packet basis */
18 #define IP6_TNL_F_CAP_PER_PACKET 0x40000
20 struct __ip6_tnl_parm {
21 char name[IFNAMSIZ]; /* name of tunnel device */
22 int link; /* ifindex of underlying L2 interface */
23 __u8 proto; /* tunnel protocol */
24 __u8 encap_limit; /* encapsulation limit for tunnel */
25 __u8 hop_limit; /* hop limit for tunnel */
27 __be32 flowinfo; /* traffic class and flowlabel for tunnel */
28 __u32 flags; /* tunnel flags */
29 struct in6_addr laddr; /* local tunnel end-point address */
30 struct in6_addr raddr; /* remote tunnel end-point address */
40 struct ip6_tnl __rcu *next; /* next tunnel in list */
41 struct net_device *dev; /* virtual device associated with tunnel */
42 struct net *net; /* netns for packet i/o */
43 struct __ip6_tnl_parm parms; /* tunnel configuration parameters */
44 struct flowi fl; /* flowi template for xmit */
45 struct dst_cache dst_cache; /* cached dst */
46 struct gro_cells gro_cells;
49 unsigned long err_time;
51 /* These fields used only by GRE */
52 __u32 i_seqno; /* The last seen seqno */
53 __u32 o_seqno; /* The last output seqno */
54 int hlen; /* tun_hlen + encap_hlen */
55 int tun_hlen; /* Precalculated header length */
56 int encap_hlen; /* Encap header length (FOU,GUE) */
57 struct ip_tunnel_encap encap;
61 struct ip6_tnl_encap_ops {
62 size_t (*encap_hlen)(struct ip_tunnel_encap *e);
63 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
64 u8 *protocol, struct flowi6 *fl6);
69 extern const struct ip6_tnl_encap_ops __rcu *
70 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS];
72 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
74 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
76 int ip6_tnl_encap_setup(struct ip6_tnl *t,
77 struct ip_tunnel_encap *ipencap);
79 static inline int ip6_encap_hlen(struct ip_tunnel_encap *e)
81 const struct ip6_tnl_encap_ops *ops;
84 if (e->type == TUNNEL_ENCAP_NONE)
87 if (e->type >= MAX_IPTUN_ENCAP_OPS)
91 ops = rcu_dereference(ip6tun_encaps[e->type]);
92 if (likely(ops && ops->encap_hlen))
93 hlen = ops->encap_hlen(e);
99 static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t,
100 u8 *protocol, struct flowi6 *fl6)
102 const struct ip6_tnl_encap_ops *ops;
105 if (t->encap.type == TUNNEL_ENCAP_NONE)
108 if (t->encap.type >= MAX_IPTUN_ENCAP_OPS)
112 ops = rcu_dereference(ip6tun_encaps[t->encap.type]);
113 if (likely(ops && ops->build_header))
114 ret = ops->build_header(skb, &t->encap, protocol, fl6);
120 /* Tunnel encapsulation limit destination sub-option */
122 struct ipv6_tlv_tnl_enc_lim {
123 __u8 type; /* type-code for option */
124 __u8 length; /* option length */
125 __u8 encap_limit; /* tunnel encapsulation limit */
128 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
129 const struct in6_addr *raddr);
130 int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
131 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
133 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
134 const struct in6_addr *raddr);
135 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
136 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __u8 proto);
137 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw);
138 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
139 const struct in6_addr *raddr);
140 struct net *ip6_tnl_get_link_net(const struct net_device *dev);
141 int ip6_tnl_get_iflink(const struct net_device *dev);
142 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu);
144 static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
145 struct net_device *dev)
149 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
150 pkt_len = skb->len - skb_inner_network_offset(skb);
151 err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb);
152 if (unlikely(net_xmit_eval(err)))
154 iptunnel_xmit_stats(dev, pkt_len);