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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - include/net/ip6_tunnel.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NET_IP6_TUNNEL_H
3 #define _NET_IP6_TUNNEL_H
5 #include <linux/ipv6.h>
6 #include <linux/netdevice.h>
7 #include <linux/if_tunnel.h>
8 #include <linux/ip6_tunnel.h>
9 #include <net/ip_tunnels.h>
10 #include <net/dst_cache.h>
12 #define IP6TUNNEL_ERR_TIMEO (30*HZ)
14 /* capable of sending packets */
15 #define IP6_TNL_F_CAP_XMIT 0x10000
16 /* capable of receiving packets */
17 #define IP6_TNL_F_CAP_RCV 0x20000
18 /* determine capability on a per-packet basis */
19 #define IP6_TNL_F_CAP_PER_PACKET 0x40000
21 struct __ip6_tnl_parm
{
22 char name
[IFNAMSIZ
]; /* name of tunnel device */
23 int link
; /* ifindex of underlying L2 interface */
24 __u8 proto
; /* tunnel protocol */
25 __u8 encap_limit
; /* encapsulation limit for tunnel */
26 __u8 hop_limit
; /* hop limit for tunnel */
28 __be32 flowinfo
; /* traffic class and flowlabel for tunnel */
29 __u32 flags
; /* tunnel flags */
30 struct in6_addr laddr
; /* local tunnel end-point address */
31 struct in6_addr raddr
; /* remote tunnel end-point address */
43 struct ip6_tnl __rcu
*next
; /* next tunnel in list */
44 struct net_device
*dev
; /* virtual device associated with tunnel */
45 struct net
*net
; /* netns for packet i/o */
46 struct __ip6_tnl_parm parms
; /* tunnel configuration parameters */
47 struct flowi fl
; /* flowi template for xmit */
48 struct dst_cache dst_cache
; /* cached dst */
49 struct gro_cells gro_cells
;
52 unsigned long err_time
;
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
; /* tun_hlen + encap_hlen */
58 int tun_hlen
; /* Precalculated header length */
59 int encap_hlen
; /* Encap header length (FOU,GUE) */
60 struct ip_tunnel_encap encap
;
64 struct ip6_tnl_encap_ops
{
65 size_t (*encap_hlen
)(struct ip_tunnel_encap
*e
);
66 int (*build_header
)(struct sk_buff
*skb
, struct ip_tunnel_encap
*e
,
67 u8
*protocol
, struct flowi6
*fl6
);
72 extern const struct ip6_tnl_encap_ops __rcu
*
73 ip6tun_encaps
[MAX_IPTUN_ENCAP_OPS
];
75 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops
*ops
,
77 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops
*ops
,
79 int ip6_tnl_encap_setup(struct ip6_tnl
*t
,
80 struct ip_tunnel_encap
*ipencap
);
82 static inline int ip6_encap_hlen(struct ip_tunnel_encap
*e
)
84 const struct ip6_tnl_encap_ops
*ops
;
87 if (e
->type
== TUNNEL_ENCAP_NONE
)
90 if (e
->type
>= MAX_IPTUN_ENCAP_OPS
)
94 ops
= rcu_dereference(ip6tun_encaps
[e
->type
]);
95 if (likely(ops
&& ops
->encap_hlen
))
96 hlen
= ops
->encap_hlen(e
);
102 static inline int ip6_tnl_encap(struct sk_buff
*skb
, struct ip6_tnl
*t
,
103 u8
*protocol
, struct flowi6
*fl6
)
105 const struct ip6_tnl_encap_ops
*ops
;
108 if (t
->encap
.type
== TUNNEL_ENCAP_NONE
)
111 if (t
->encap
.type
>= MAX_IPTUN_ENCAP_OPS
)
115 ops
= rcu_dereference(ip6tun_encaps
[t
->encap
.type
]);
116 if (likely(ops
&& ops
->build_header
))
117 ret
= ops
->build_header(skb
, &t
->encap
, protocol
, fl6
);
123 /* Tunnel encapsulation limit destination sub-option */
125 struct ipv6_tlv_tnl_enc_lim
{
126 __u8 type
; /* type-code for option */
127 __u8 length
; /* option length */
128 __u8 encap_limit
; /* tunnel encapsulation limit */
131 int ip6_tnl_rcv_ctl(struct ip6_tnl
*t
, const struct in6_addr
*laddr
,
132 const struct in6_addr
*raddr
);
133 int ip6_tnl_rcv(struct ip6_tnl
*tunnel
, struct sk_buff
*skb
,
134 const struct tnl_ptk_info
*tpi
, struct metadata_dst
*tun_dst
,
136 int ip6_tnl_xmit_ctl(struct ip6_tnl
*t
, const struct in6_addr
*laddr
,
137 const struct in6_addr
*raddr
);
138 int ip6_tnl_xmit(struct sk_buff
*skb
, struct net_device
*dev
, __u8 dsfield
,
139 struct flowi6
*fl6
, int encap_limit
, __u32
*pmtu
, __u8 proto
);
140 __u16
ip6_tnl_parse_tlv_enc_lim(struct sk_buff
*skb
, __u8
*raw
);
141 __u32
ip6_tnl_get_cap(struct ip6_tnl
*t
, const struct in6_addr
*laddr
,
142 const struct in6_addr
*raddr
);
143 struct net
*ip6_tnl_get_link_net(const struct net_device
*dev
);
144 int ip6_tnl_get_iflink(const struct net_device
*dev
);
145 int ip6_tnl_change_mtu(struct net_device
*dev
, int new_mtu
);
147 static inline void ip6tunnel_xmit(struct sock
*sk
, struct sk_buff
*skb
,
148 struct net_device
*dev
)
152 memset(skb
->cb
, 0, sizeof(struct inet6_skb_parm
));
153 pkt_len
= skb
->len
- skb_inner_network_offset(skb
);
154 err
= ip6_local_out(dev_net(skb_dst(skb
)->dev
), sk
, skb
);
155 if (unlikely(net_xmit_eval(err
)))
157 iptunnel_xmit_stats(dev
, pkt_len
);