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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
46 int err_count;
47 unsigned long err_time;
48
49 /* These fields used only by GRE */
50 __u32 i_seqno; /* The last seen seqno */
51 __u32 o_seqno; /* The last output seqno */
52 int hlen; /* Precalculated GRE header length */
53 int mlink;
54};
55
56/* Tunnel encapsulation limit destination sub-option */
57
58struct ipv6_tlv_tnl_enc_lim {
59 __u8 type; /* type-code for option */
60 __u8 length; /* option length */
61 __u8 encap_limit; /* tunnel encapsulation limit */
62} __packed;
63
64int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
65 const struct in6_addr *raddr);
66int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
67 const struct in6_addr *raddr);
68__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw);
69__u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
70 const struct in6_addr *raddr);
71struct net *ip6_tnl_get_link_net(const struct net_device *dev);
72int ip6_tnl_get_iflink(const struct net_device *dev);
73
74#ifdef CONFIG_INET
75static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
76 struct net_device *dev)
77{
78 int pkt_len, err;
79
80 pkt_len = skb->len - skb_inner_network_offset(skb);
81 err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb);
82 if (unlikely(net_xmit_eval(err)))
83 pkt_len = -1;
84 iptunnel_xmit_stats(dev, pkt_len);
85}
86#endif
87#endif
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 bool collect_md;
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 */
31
32 __be16 i_flags;
33 __be16 o_flags;
34 __be32 i_key;
35 __be32 o_key;
36};
37
38/* IPv6 tunnel */
39struct ip6_tnl {
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;
47
48 int err_count;
49 unsigned long err_time;
50
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;
58 int mlink;
59};
60
61struct 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);
65};
66
67#ifdef CONFIG_INET
68
69extern const struct ip6_tnl_encap_ops __rcu *
70 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS];
71
72int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
73 unsigned int num);
74int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
75 unsigned int num);
76int ip6_tnl_encap_setup(struct ip6_tnl *t,
77 struct ip_tunnel_encap *ipencap);
78
79static inline int ip6_encap_hlen(struct ip_tunnel_encap *e)
80{
81 const struct ip6_tnl_encap_ops *ops;
82 int hlen = -EINVAL;
83
84 if (e->type == TUNNEL_ENCAP_NONE)
85 return 0;
86
87 if (e->type >= MAX_IPTUN_ENCAP_OPS)
88 return -EINVAL;
89
90 rcu_read_lock();
91 ops = rcu_dereference(ip6tun_encaps[e->type]);
92 if (likely(ops && ops->encap_hlen))
93 hlen = ops->encap_hlen(e);
94 rcu_read_unlock();
95
96 return hlen;
97}
98
99static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t,
100 u8 *protocol, struct flowi6 *fl6)
101{
102 const struct ip6_tnl_encap_ops *ops;
103 int ret = -EINVAL;
104
105 if (t->encap.type == TUNNEL_ENCAP_NONE)
106 return 0;
107
108 if (t->encap.type >= MAX_IPTUN_ENCAP_OPS)
109 return -EINVAL;
110
111 rcu_read_lock();
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);
115 rcu_read_unlock();
116
117 return ret;
118}
119
120/* Tunnel encapsulation limit destination sub-option */
121
122struct ipv6_tlv_tnl_enc_lim {
123 __u8 type; /* type-code for option */
124 __u8 length; /* option length */
125 __u8 encap_limit; /* tunnel encapsulation limit */
126} __packed;
127
128int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
129 const struct in6_addr *raddr);
130int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
131 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
132 bool log_ecn_error);
133int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
134 const struct in6_addr *raddr);
135int 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);
140struct net *ip6_tnl_get_link_net(const struct net_device *dev);
141int ip6_tnl_get_iflink(const struct net_device *dev);
142int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu);
143
144static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
145 struct net_device *dev)
146{
147 int pkt_len, err;
148
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)))
153 pkt_len = -1;
154 iptunnel_xmit_stats(dev, pkt_len);
155}
156#endif
157#endif