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 */
42 struct ip6_tnl __rcu
*next
; /* next tunnel in list */
43 struct net_device
*dev
; /* virtual device associated with tunnel */
44 struct net
*net
; /* netns for packet i/o */
45 struct __ip6_tnl_parm parms
; /* tunnel configuration parameters */
46 struct flowi fl
; /* flowi template for xmit */
47 struct dst_cache dst_cache
; /* cached dst */
48 struct gro_cells gro_cells
;
51 unsigned long err_time
;
53 /* These fields used only by GRE */
54 __u32 i_seqno
; /* The last seen seqno */
55 __u32 o_seqno
; /* The last output seqno */
56 int hlen
; /* tun_hlen + encap_hlen */
57 int tun_hlen
; /* Precalculated header length */
58 int encap_hlen
; /* Encap header length (FOU,GUE) */
59 struct ip_tunnel_encap encap
;
63 struct ip6_tnl_encap_ops
{
64 size_t (*encap_hlen
)(struct ip_tunnel_encap
*e
);
65 int (*build_header
)(struct sk_buff
*skb
, struct ip_tunnel_encap
*e
,
66 u8
*protocol
, struct flowi6
*fl6
);
71 extern const struct ip6_tnl_encap_ops __rcu
*
72 ip6tun_encaps
[MAX_IPTUN_ENCAP_OPS
];
74 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops
*ops
,
76 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops
*ops
,
78 int ip6_tnl_encap_setup(struct ip6_tnl
*t
,
79 struct ip_tunnel_encap
*ipencap
);
81 static inline int ip6_encap_hlen(struct ip_tunnel_encap
*e
)
83 const struct ip6_tnl_encap_ops
*ops
;
86 if (e
->type
== TUNNEL_ENCAP_NONE
)
89 if (e
->type
>= MAX_IPTUN_ENCAP_OPS
)
93 ops
= rcu_dereference(ip6tun_encaps
[e
->type
]);
94 if (likely(ops
&& ops
->encap_hlen
))
95 hlen
= ops
->encap_hlen(e
);
101 static inline int ip6_tnl_encap(struct sk_buff
*skb
, struct ip6_tnl
*t
,
102 u8
*protocol
, struct flowi6
*fl6
)
104 const struct ip6_tnl_encap_ops
*ops
;
107 if (t
->encap
.type
== TUNNEL_ENCAP_NONE
)
110 if (t
->encap
.type
>= MAX_IPTUN_ENCAP_OPS
)
114 ops
= rcu_dereference(ip6tun_encaps
[t
->encap
.type
]);
115 if (likely(ops
&& ops
->build_header
))
116 ret
= ops
->build_header(skb
, &t
->encap
, protocol
, fl6
);
122 /* Tunnel encapsulation limit destination sub-option */
124 struct ipv6_tlv_tnl_enc_lim
{
125 __u8 type
; /* type-code for option */
126 __u8 length
; /* option length */
127 __u8 encap_limit
; /* tunnel encapsulation limit */
130 int ip6_tnl_rcv_ctl(struct ip6_tnl
*t
, const struct in6_addr
*laddr
,
131 const struct in6_addr
*raddr
);
132 int ip6_tnl_rcv(struct ip6_tnl
*tunnel
, struct sk_buff
*skb
,
133 const struct tnl_ptk_info
*tpi
, struct metadata_dst
*tun_dst
,
135 int ip6_tnl_xmit_ctl(struct ip6_tnl
*t
, const struct in6_addr
*laddr
,
136 const struct in6_addr
*raddr
);
137 int ip6_tnl_xmit(struct sk_buff
*skb
, struct net_device
*dev
, __u8 dsfield
,
138 struct flowi6
*fl6
, int encap_limit
, __u32
*pmtu
, __u8 proto
);
139 __u16
ip6_tnl_parse_tlv_enc_lim(struct sk_buff
*skb
, __u8
*raw
);
140 __u32
ip6_tnl_get_cap(struct ip6_tnl
*t
, const struct in6_addr
*laddr
,
141 const struct in6_addr
*raddr
);
142 struct net
*ip6_tnl_get_link_net(const struct net_device
*dev
);
143 int ip6_tnl_get_iflink(const struct net_device
*dev
);
144 int ip6_tnl_change_mtu(struct net_device
*dev
, int new_mtu
);
146 static inline void ip6tunnel_xmit(struct sock
*sk
, struct sk_buff
*skb
,
147 struct net_device
*dev
)
151 memset(skb
->cb
, 0, sizeof(struct inet6_skb_parm
));
152 pkt_len
= skb
->len
- skb_inner_network_offset(skb
);
153 err
= ip6_local_out(dev_net(skb_dst(skb
)->dev
), sk
, skb
);
154 if (unlikely(net_xmit_eval(err
)))
156 iptunnel_xmit_stats(dev
, pkt_len
);