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1da177e4 LT |
1 | #ifndef _NET_IP6_TUNNEL_H |
2 | #define _NET_IP6_TUNNEL_H | |
3 | ||
4 | #include <linux/ipv6.h> | |
5 | #include <linux/netdevice.h> | |
c5441932 | 6 | #include <linux/if_tunnel.h> |
1da177e4 | 7 | #include <linux/ip6_tunnel.h> |
039f5062 | 8 | #include <net/ip_tunnels.h> |
607f725f | 9 | #include <net/dst_cache.h> |
1da177e4 | 10 | |
c12b395a | 11 | #define IP6TUNNEL_ERR_TIMEO (30*HZ) |
12 | ||
1da177e4 LT |
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 | |
d0087b29 VN |
17 | /* determine capability on a per-packet basis */ |
18 | #define IP6_TNL_F_CAP_PER_PACKET 0x40000 | |
1da177e4 | 19 | |
c12b395a | 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 */ | |
8d79266b | 26 | bool collect_md; |
c12b395a | 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; | |
0a473b82 CG |
36 | |
37 | __u32 fwmark; | |
c12b395a | 38 | }; |
1da177e4 | 39 | |
c12b395a | 40 | /* IPv6 tunnel */ |
1da177e4 | 41 | struct ip6_tnl { |
6f0bcf15 | 42 | struct ip6_tnl __rcu *next; /* next tunnel in list */ |
1da177e4 | 43 | struct net_device *dev; /* virtual device associated with tunnel */ |
0bd87628 | 44 | struct net *net; /* netns for packet i/o */ |
c12b395a | 45 | struct __ip6_tnl_parm parms; /* tunnel configuration parameters */ |
1da177e4 | 46 | struct flowi fl; /* flowi template for xmit */ |
607f725f | 47 | struct dst_cache dst_cache; /* cached dst */ |
0d3c703a | 48 | struct gro_cells gro_cells; |
c12b395a | 49 | |
50 | int err_count; | |
51 | unsigned long err_time; | |
52 | ||
53 | /* These fields used only by GRE */ | |
54 | __u32 i_seqno; /* The last seen seqno */ | |
55 | __u32 o_seqno; /* The last output seqno */ | |
79ecb90e TH |
56 | int hlen; /* tun_hlen + encap_hlen */ |
57 | int tun_hlen; /* Precalculated header length */ | |
058214a4 TH |
58 | int encap_hlen; /* Encap header length (FOU,GUE) */ |
59 | struct ip_tunnel_encap encap; | |
c12b395a | 60 | int mlink; |
058214a4 | 61 | }; |
79ecb90e | 62 | |
058214a4 TH |
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); | |
1da177e4 LT |
67 | }; |
68 | ||
9791d8e7 AB |
69 | #ifdef CONFIG_INET |
70 | ||
058214a4 TH |
71 | extern const struct ip6_tnl_encap_ops __rcu * |
72 | ip6tun_encaps[MAX_IPTUN_ENCAP_OPS]; | |
73 | ||
74 | int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, | |
75 | unsigned int num); | |
76 | int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, | |
77 | unsigned int num); | |
78 | int ip6_tnl_encap_setup(struct ip6_tnl *t, | |
79 | struct ip_tunnel_encap *ipencap); | |
80 | ||
81 | static inline int ip6_encap_hlen(struct ip_tunnel_encap *e) | |
82 | { | |
83 | const struct ip6_tnl_encap_ops *ops; | |
84 | int hlen = -EINVAL; | |
85 | ||
86 | if (e->type == TUNNEL_ENCAP_NONE) | |
87 | return 0; | |
88 | ||
89 | if (e->type >= MAX_IPTUN_ENCAP_OPS) | |
90 | return -EINVAL; | |
91 | ||
92 | rcu_read_lock(); | |
93 | ops = rcu_dereference(ip6tun_encaps[e->type]); | |
94 | if (likely(ops && ops->encap_hlen)) | |
95 | hlen = ops->encap_hlen(e); | |
96 | rcu_read_unlock(); | |
97 | ||
98 | return hlen; | |
99 | } | |
100 | ||
101 | static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t, | |
102 | u8 *protocol, struct flowi6 *fl6) | |
103 | { | |
104 | const struct ip6_tnl_encap_ops *ops; | |
105 | int ret = -EINVAL; | |
106 | ||
107 | if (t->encap.type == TUNNEL_ENCAP_NONE) | |
108 | return 0; | |
109 | ||
110 | if (t->encap.type >= MAX_IPTUN_ENCAP_OPS) | |
111 | return -EINVAL; | |
112 | ||
113 | rcu_read_lock(); | |
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); | |
117 | rcu_read_unlock(); | |
118 | ||
119 | return ret; | |
120 | } | |
121 | ||
1da177e4 LT |
122 | /* Tunnel encapsulation limit destination sub-option */ |
123 | ||
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 */ | |
bc10502d | 128 | } __packed; |
1da177e4 | 129 | |
c12b395a | 130 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, |
131 | const struct in6_addr *raddr); | |
0d3c703a TH |
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, | |
134 | bool log_ecn_error); | |
d5005140 SK |
135 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, |
136 | const struct in6_addr *raddr); | |
8eb30be0 TH |
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); | |
c12b395a | 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); | |
1728d4fa | 142 | struct net *ip6_tnl_get_link_net(const struct net_device *dev); |
ecf2c06a | 143 | int ip6_tnl_get_iflink(const struct net_device *dev); |
79ecb90e | 144 | int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu); |
c12b395a | 145 | |
79b16aad DM |
146 | static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb, |
147 | struct net_device *dev) | |
e8f72ea4 | 148 | { |
e8f72ea4 CW |
149 | int pkt_len, err; |
150 | ||
23f4ffed | 151 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); |
83cf9a25 | 152 | pkt_len = skb->len - skb_inner_network_offset(skb); |
33224b16 | 153 | err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb); |
039f5062 PS |
154 | if (unlikely(net_xmit_eval(err))) |
155 | pkt_len = -1; | |
156 | iptunnel_xmit_stats(dev, pkt_len); | |
e8f72ea4 | 157 | } |
1da177e4 | 158 | #endif |
0efeff29 | 159 | #endif |