1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _NET_IP6_TUNNEL_H |
3 | #define _NET_IP6_TUNNEL_H |
4 | |
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> |
11 | |
12 | #define IP6TUNNEL_ERR_TIMEO (30*HZ) |
13 | |
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 |
20 | |
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 */ |
27 | bool collect_md; |
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; |
37 | |
38 | __u32 fwmark; |
39 | __u32 index; /* ERSPAN type II index */ |
40 | __u8 erspan_ver; /* ERSPAN version */ |
41 | __u8 dir; /* direction */ |
42 | __u16 hwid; /* hwid */ |
43 | }; |
44 | |
45 | /* IPv6 tunnel */ |
46 | struct ip6_tnl { |
47 | struct ip6_tnl __rcu *next; /* next tunnel in list */ |
48 | struct net_device *dev; /* virtual device associated with tunnel */ |
49 | netdevice_tracker dev_tracker; |
50 | struct net *net; /* netns for packet i/o */ |
51 | struct __ip6_tnl_parm parms; /* tunnel configuration parameters */ |
52 | struct flowi fl; /* flowi template for xmit */ |
53 | struct dst_cache dst_cache; /* cached dst */ |
54 | struct gro_cells gro_cells; |
55 | |
56 | int err_count; |
57 | unsigned long err_time; |
58 | |
59 | /* These fields used only by GRE */ |
60 | __u32 i_seqno; /* The last seen seqno */ |
61 | atomic_t o_seqno; /* The last output seqno */ |
62 | int hlen; /* tun_hlen + encap_hlen */ |
63 | int tun_hlen; /* Precalculated header length */ |
64 | int encap_hlen; /* Encap header length (FOU,GUE) */ |
65 | struct ip_tunnel_encap encap; |
66 | int mlink; |
67 | }; |
68 | |
69 | struct ip6_tnl_encap_ops { |
70 | size_t (*encap_hlen)(struct ip_tunnel_encap *e); |
71 | int (*)(struct sk_buff *skb, struct ip_tunnel_encap *e, |
72 | u8 *protocol, struct flowi6 *fl6); |
73 | int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, |
74 | u8 type, u8 code, int offset, __be32 info); |
75 | }; |
76 | |
77 | #ifdef CONFIG_INET |
78 | |
79 | extern const struct ip6_tnl_encap_ops __rcu * |
80 | ip6tun_encaps[MAX_IPTUN_ENCAP_OPS]; |
81 | |
82 | int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, |
83 | unsigned int num); |
84 | int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, |
85 | unsigned int num); |
86 | int ip6_tnl_encap_setup(struct ip6_tnl *t, |
87 | struct ip_tunnel_encap *ipencap); |
88 | |
89 | static inline int ip6_encap_hlen(struct ip_tunnel_encap *e) |
90 | { |
91 | const struct ip6_tnl_encap_ops *ops; |
92 | int hlen = -EINVAL; |
93 | |
94 | if (e->type == TUNNEL_ENCAP_NONE) |
95 | return 0; |
96 | |
97 | if (e->type >= MAX_IPTUN_ENCAP_OPS) |
98 | return -EINVAL; |
99 | |
100 | rcu_read_lock(); |
101 | ops = rcu_dereference(ip6tun_encaps[e->type]); |
102 | if (likely(ops && ops->encap_hlen)) |
103 | hlen = ops->encap_hlen(e); |
104 | rcu_read_unlock(); |
105 | |
106 | return hlen; |
107 | } |
108 | |
109 | static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t, |
110 | u8 *protocol, struct flowi6 *fl6) |
111 | { |
112 | const struct ip6_tnl_encap_ops *ops; |
113 | int ret = -EINVAL; |
114 | |
115 | if (t->encap.type == TUNNEL_ENCAP_NONE) |
116 | return 0; |
117 | |
118 | if (t->encap.type >= MAX_IPTUN_ENCAP_OPS) |
119 | return -EINVAL; |
120 | |
121 | rcu_read_lock(); |
122 | ops = rcu_dereference(ip6tun_encaps[t->encap.type]); |
123 | if (likely(ops && ops->build_header)) |
124 | ret = ops->build_header(skb, &t->encap, protocol, fl6); |
125 | rcu_read_unlock(); |
126 | |
127 | return ret; |
128 | } |
129 | |
130 | /* Tunnel encapsulation limit destination sub-option */ |
131 | |
132 | struct ipv6_tlv_tnl_enc_lim { |
133 | __u8 type; /* type-code for option */ |
134 | __u8 length; /* option length */ |
135 | __u8 encap_limit; /* tunnel encapsulation limit */ |
136 | } __packed; |
137 | |
138 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, |
139 | const struct in6_addr *raddr); |
140 | int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, |
141 | const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, |
142 | bool log_ecn_error); |
143 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, |
144 | const struct in6_addr *raddr); |
145 | int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, |
146 | struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __u8 proto); |
147 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw); |
148 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr, |
149 | const struct in6_addr *raddr); |
150 | struct net *ip6_tnl_get_link_net(const struct net_device *dev); |
151 | int ip6_tnl_get_iflink(const struct net_device *dev); |
152 | int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu); |
153 | |
154 | static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb, |
155 | struct net_device *dev) |
156 | { |
157 | int pkt_len, err; |
158 | |
159 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); |
160 | pkt_len = skb->len - skb_inner_network_offset(skb); |
161 | err = ip6_local_out(net: dev_net(dev: skb_dst(skb)->dev), sk, skb); |
162 | |
163 | if (dev) { |
164 | if (unlikely(net_xmit_eval(err))) |
165 | pkt_len = -1; |
166 | iptunnel_xmit_stats(dev, pkt_len); |
167 | } |
168 | } |
169 | #endif |
170 | #endif |
171 | |