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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _NET_IP6_TUNNEL_H |
3 | #define _NET_IP6_TUNNEL_H | |
4 | ||
5 | #include <linux/ipv6.h> | |
6 | #include <linux/netdevice.h> | |
c5441932 | 7 | #include <linux/if_tunnel.h> |
1da177e4 | 8 | #include <linux/ip6_tunnel.h> |
039f5062 | 9 | #include <net/ip_tunnels.h> |
607f725f | 10 | #include <net/dst_cache.h> |
1da177e4 | 11 | |
c12b395a | 12 | #define IP6TUNNEL_ERR_TIMEO (30*HZ) |
13 | ||
1da177e4 LT |
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 | |
d0087b29 VN |
18 | /* determine capability on a per-packet basis */ |
19 | #define IP6_TNL_F_CAP_PER_PACKET 0x40000 | |
1da177e4 | 20 | |
c12b395a | 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 */ | |
8d79266b | 27 | bool collect_md; |
c12b395a | 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 */ | |
32 | ||
33 | __be16 i_flags; | |
34 | __be16 o_flags; | |
35 | __be32 i_key; | |
36 | __be32 o_key; | |
0a473b82 CG |
37 | |
38 | __u32 fwmark; | |
c12b395a | 39 | }; |
1da177e4 | 40 | |
c12b395a | 41 | /* IPv6 tunnel */ |
1da177e4 | 42 | struct ip6_tnl { |
6f0bcf15 | 43 | struct ip6_tnl __rcu *next; /* next tunnel in list */ |
1da177e4 | 44 | struct net_device *dev; /* virtual device associated with tunnel */ |
0bd87628 | 45 | struct net *net; /* netns for packet i/o */ |
c12b395a | 46 | struct __ip6_tnl_parm parms; /* tunnel configuration parameters */ |
1da177e4 | 47 | struct flowi fl; /* flowi template for xmit */ |
607f725f | 48 | struct dst_cache dst_cache; /* cached dst */ |
0d3c703a | 49 | struct gro_cells gro_cells; |
c12b395a | 50 | |
51 | int err_count; | |
52 | unsigned long err_time; | |
53 | ||
54 | /* These fields used only by GRE */ | |
55 | __u32 i_seqno; /* The last seen seqno */ | |
56 | __u32 o_seqno; /* The last output seqno */ | |
79ecb90e TH |
57 | int hlen; /* tun_hlen + encap_hlen */ |
58 | int tun_hlen; /* Precalculated header length */ | |
058214a4 TH |
59 | int encap_hlen; /* Encap header length (FOU,GUE) */ |
60 | struct ip_tunnel_encap encap; | |
c12b395a | 61 | int mlink; |
058214a4 | 62 | }; |
79ecb90e | 63 | |
058214a4 TH |
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); | |
1da177e4 LT |
68 | }; |
69 | ||
9791d8e7 AB |
70 | #ifdef CONFIG_INET |
71 | ||
058214a4 TH |
72 | extern const struct ip6_tnl_encap_ops __rcu * |
73 | ip6tun_encaps[MAX_IPTUN_ENCAP_OPS]; | |
74 | ||
75 | int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, | |
76 | unsigned int num); | |
77 | int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, | |
78 | unsigned int num); | |
79 | int ip6_tnl_encap_setup(struct ip6_tnl *t, | |
80 | struct ip_tunnel_encap *ipencap); | |
81 | ||
82 | static inline int ip6_encap_hlen(struct ip_tunnel_encap *e) | |
83 | { | |
84 | const struct ip6_tnl_encap_ops *ops; | |
85 | int hlen = -EINVAL; | |
86 | ||
87 | if (e->type == TUNNEL_ENCAP_NONE) | |
88 | return 0; | |
89 | ||
90 | if (e->type >= MAX_IPTUN_ENCAP_OPS) | |
91 | return -EINVAL; | |
92 | ||
93 | rcu_read_lock(); | |
94 | ops = rcu_dereference(ip6tun_encaps[e->type]); | |
95 | if (likely(ops && ops->encap_hlen)) | |
96 | hlen = ops->encap_hlen(e); | |
97 | rcu_read_unlock(); | |
98 | ||
99 | return hlen; | |
100 | } | |
101 | ||
102 | static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t, | |
103 | u8 *protocol, struct flowi6 *fl6) | |
104 | { | |
105 | const struct ip6_tnl_encap_ops *ops; | |
106 | int ret = -EINVAL; | |
107 | ||
108 | if (t->encap.type == TUNNEL_ENCAP_NONE) | |
109 | return 0; | |
110 | ||
111 | if (t->encap.type >= MAX_IPTUN_ENCAP_OPS) | |
112 | return -EINVAL; | |
113 | ||
114 | rcu_read_lock(); | |
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); | |
118 | rcu_read_unlock(); | |
119 | ||
120 | return ret; | |
121 | } | |
122 | ||
1da177e4 LT |
123 | /* Tunnel encapsulation limit destination sub-option */ |
124 | ||
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 */ | |
bc10502d | 129 | } __packed; |
1da177e4 | 130 | |
c12b395a | 131 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, |
132 | const struct in6_addr *raddr); | |
0d3c703a TH |
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, | |
135 | bool log_ecn_error); | |
d5005140 SK |
136 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, |
137 | const struct in6_addr *raddr); | |
8eb30be0 TH |
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); | |
c12b395a | 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); | |
1728d4fa | 143 | struct net *ip6_tnl_get_link_net(const struct net_device *dev); |
ecf2c06a | 144 | int ip6_tnl_get_iflink(const struct net_device *dev); |
79ecb90e | 145 | int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu); |
c12b395a | 146 | |
79b16aad DM |
147 | static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb, |
148 | struct net_device *dev) | |
e8f72ea4 | 149 | { |
e8f72ea4 CW |
150 | int pkt_len, err; |
151 | ||
23f4ffed | 152 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); |
83cf9a25 | 153 | pkt_len = skb->len - skb_inner_network_offset(skb); |
33224b16 | 154 | err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb); |
039f5062 PS |
155 | if (unlikely(net_xmit_eval(err))) |
156 | pkt_len = -1; | |
157 | iptunnel_xmit_stats(dev, pkt_len); | |
e8f72ea4 | 158 | } |
1da177e4 | 159 | #endif |
0efeff29 | 160 | #endif |