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192.168.1.100 / T800 / b29aec358f22d21c6e54decdbdc53c0e8aa7c76b / . / src / kernel / linux / v4.19 / include / net / ip6_tunnel.h
blob: 7f72f9b1d4a4f55d525174974142951cd7099dac [file] [log] [blame]
xjb04a4022021-11-25 15:01:52 +0800[diff] [blame]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/* IPv6 tunnel FMR */
22struct __ip6_tnl_fmr {
23 struct __ip6_tnl_fmr *next; /* next fmr in list */
24 struct in6_addr ip6_prefix;
25 struct in_addr ip4_prefix;
26
27 __u8 ip6_prefix_len;
28 __u8 ip4_prefix_len;
29 __u8 ea_len;
30 __u8 offset;
31};
32
33struct __ip6_tnl_parm {
34 char name[IFNAMSIZ]; /* name of tunnel device */
35 int link; /* ifindex of underlying L2 interface */
36 __u8 proto; /* tunnel protocol */
37 __u8 encap_limit; /* encapsulation limit for tunnel */
38 __u8 hop_limit; /* hop limit for tunnel */
39 bool collect_md;
40 __be32 flowinfo; /* traffic class and flowlabel for tunnel */
41 __u32 flags; /* tunnel flags */
42 struct in6_addr laddr; /* local tunnel end-point address */
43 struct in6_addr raddr; /* remote tunnel end-point address */
44 struct __ip6_tnl_fmr *fmrs; /* FMRs */
45
46 __be16 i_flags;
47 __be16 o_flags;
48 __be32 i_key;
49 __be32 o_key;
50
51 __u32 fwmark;
52 __u32 index; /* ERSPAN type II index */
53 __u8 erspan_ver; /* ERSPAN version */
54 __u8 dir; /* direction */
55 __u16 hwid; /* hwid */
56};
57
58/* IPv6 tunnel */
59struct ip6_tnl {
60 struct ip6_tnl __rcu *next; /* next tunnel in list */
61 struct net_device *dev; /* virtual device associated with tunnel */
62 struct net *net; /* netns for packet i/o */
63 struct __ip6_tnl_parm parms; /* tunnel configuration parameters */
64 struct flowi fl; /* flowi template for xmit */
65 struct dst_cache dst_cache; /* cached dst */
66 struct gro_cells gro_cells;
67
68 int err_count;
69 unsigned long err_time;
70
71 /* These fields used only by GRE */
72 __u32 i_seqno; /* The last seen seqno */
73 __u32 o_seqno; /* The last output seqno */
74 int hlen; /* tun_hlen + encap_hlen */
75 int tun_hlen; /* Precalculated header length */
76 int encap_hlen; /* Encap header length (FOU,GUE) */
77 struct ip_tunnel_encap encap;
78 int mlink;
79};
80
81struct ip6_tnl_encap_ops {
82 size_t (*encap_hlen)(struct ip_tunnel_encap *e);
83 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
84 u8 *protocol, struct flowi6 *fl6);
85};
86
87#ifdef CONFIG_INET
88
89extern const struct ip6_tnl_encap_ops __rcu *
90 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS];
91
92int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
93 unsigned int num);
94int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
95 unsigned int num);
96int ip6_tnl_encap_setup(struct ip6_tnl *t,
97 struct ip_tunnel_encap *ipencap);
98
99static inline int ip6_encap_hlen(struct ip_tunnel_encap *e)
100{
101 const struct ip6_tnl_encap_ops *ops;
102 int hlen = -EINVAL;
103
104 if (e->type == TUNNEL_ENCAP_NONE)
105 return 0;
106
107 if (e->type >= MAX_IPTUN_ENCAP_OPS)
108 return -EINVAL;
109
110 rcu_read_lock();
111 ops = rcu_dereference(ip6tun_encaps[e->type]);
112 if (likely(ops && ops->encap_hlen))
113 hlen = ops->encap_hlen(e);
114 rcu_read_unlock();
115
116 return hlen;
117}
118
119static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t,
120 u8 *protocol, struct flowi6 *fl6)
121{
122 const struct ip6_tnl_encap_ops *ops;
123 int ret = -EINVAL;
124
125 if (t->encap.type == TUNNEL_ENCAP_NONE)
126 return 0;
127
128 if (t->encap.type >= MAX_IPTUN_ENCAP_OPS)
129 return -EINVAL;
130
131 rcu_read_lock();
132 ops = rcu_dereference(ip6tun_encaps[t->encap.type]);
133 if (likely(ops && ops->build_header))
134 ret = ops->build_header(skb, &t->encap, protocol, fl6);
135 rcu_read_unlock();
136
137 return ret;
138}
139
140/* Tunnel encapsulation limit destination sub-option */
141
142struct ipv6_tlv_tnl_enc_lim {
143 __u8 type; /* type-code for option */
144 __u8 length; /* option length */
145 __u8 encap_limit; /* tunnel encapsulation limit */
146} __packed;
147
148int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
149 const struct in6_addr *raddr);
150int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
151 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
152 bool log_ecn_error);
153int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
154 const struct in6_addr *raddr);
155int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
156 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __u8 proto);
157__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw);
158__u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
159 const struct in6_addr *raddr);
160struct net *ip6_tnl_get_link_net(const struct net_device *dev);
161int ip6_tnl_get_iflink(const struct net_device *dev);
162int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu);
163
164static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
165 struct net_device *dev)
166{
167 int pkt_len, err;
168
169 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
170 pkt_len = skb->len - skb_inner_network_offset(skb);
171 err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb);
172
173 if (dev) {
174 if (unlikely(net_xmit_eval(err)))
175 pkt_len = -1;
176 iptunnel_xmit_stats(dev, pkt_len);
177 }
178}
179#endif
180#endif