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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#include <net/dst_cache.h>
10
11#define IP6TUNNEL_ERR_TIMEO (30*HZ)
12
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
19
20struct __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 */
26 __be32 flowinfo; /* traffic class and flowlabel for tunnel */
27 __u32 flags; /* tunnel flags */
28 struct in6_addr laddr; /* local tunnel end-point address */
29 struct in6_addr raddr; /* remote tunnel end-point address */
30
31 __be16 i_flags;
32 __be16 o_flags;
33 __be32 i_key;
34 __be32 o_key;
35};
36
37/* IPv6 tunnel */
38struct ip6_tnl {
39 struct ip6_tnl __rcu *next; /* next tunnel in list */
40 struct net_device *dev; /* virtual device associated with tunnel */
41 struct net *net; /* netns for packet i/o */
42 struct __ip6_tnl_parm parms; /* tunnel configuration parameters */
43 struct flowi fl; /* flowi template for xmit */
44 struct dst_cache dst_cache; /* cached dst */
45 struct gro_cells gro_cells;
46
47 int err_count;
48 unsigned long err_time;
49
50 /* These fields used only by GRE */
51 __u32 i_seqno; /* The last seen seqno */
52 __u32 o_seqno; /* The last output seqno */
53 int hlen; /* tun_hlen + encap_hlen */
54 int tun_hlen; /* Precalculated header length */
55 int encap_hlen; /* Encap header length (FOU,GUE) */
56 struct ip_tunnel_encap encap;
57 int mlink;
58};
59
60struct ip6_tnl_encap_ops {
61 size_t (*encap_hlen)(struct ip_tunnel_encap *e);
62 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
63 u8 *protocol, struct flowi6 *fl6);
64};
65
66#ifdef CONFIG_INET
67
68extern const struct ip6_tnl_encap_ops __rcu *
69 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS];
70
71int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
72 unsigned int num);
73int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
74 unsigned int num);
75int ip6_tnl_encap_setup(struct ip6_tnl *t,
76 struct ip_tunnel_encap *ipencap);
77
78static inline int ip6_encap_hlen(struct ip_tunnel_encap *e)
79{
80 const struct ip6_tnl_encap_ops *ops;
81 int hlen = -EINVAL;
82
83 if (e->type == TUNNEL_ENCAP_NONE)
84 return 0;
85
86 if (e->type >= MAX_IPTUN_ENCAP_OPS)
87 return -EINVAL;
88
89 rcu_read_lock();
90 ops = rcu_dereference(ip6tun_encaps[e->type]);
91 if (likely(ops && ops->encap_hlen))
92 hlen = ops->encap_hlen(e);
93 rcu_read_unlock();
94
95 return hlen;
96}
97
98static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t,
99 u8 *protocol, struct flowi6 *fl6)
100{
101 const struct ip6_tnl_encap_ops *ops;
102 int ret = -EINVAL;
103
104 if (t->encap.type == TUNNEL_ENCAP_NONE)
105 return 0;
106
107 if (t->encap.type >= MAX_IPTUN_ENCAP_OPS)
108 return -EINVAL;
109
110 rcu_read_lock();
111 ops = rcu_dereference(ip6tun_encaps[t->encap.type]);
112 if (likely(ops && ops->build_header))
113 ret = ops->build_header(skb, &t->encap, protocol, fl6);
114 rcu_read_unlock();
115
116 return ret;
117}
118
119/* Tunnel encapsulation limit destination sub-option */
120
121struct ipv6_tlv_tnl_enc_lim {
122 __u8 type; /* type-code for option */
123 __u8 length; /* option length */
124 __u8 encap_limit; /* tunnel encapsulation limit */
125} __packed;
126
127int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
128 const struct in6_addr *raddr);
129int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
130 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
131 bool log_ecn_error);
132int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
133 const struct in6_addr *raddr);
134int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
135 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __u8 proto);
136__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw);
137__u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
138 const struct in6_addr *raddr);
139struct net *ip6_tnl_get_link_net(const struct net_device *dev);
140int ip6_tnl_get_iflink(const struct net_device *dev);
141int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu);
142
143static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
144 struct net_device *dev)
145{
146 int pkt_len, err;
147
148 pkt_len = skb->len - skb_inner_network_offset(skb);
149 err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb);
150 if (unlikely(net_xmit_eval(err)))
151 pkt_len = -1;
152 iptunnel_xmit_stats(dev, pkt_len);
153}
154#endif
155#endif