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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
21struct __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 */
46struct ip6_tnl {
47 struct ip6_tnl __rcu *next; /* next tunnel in list */
48 struct net_device *dev; /* virtual device associated with tunnel */
49 struct net *net; /* netns for packet i/o */
50 struct __ip6_tnl_parm parms; /* tunnel configuration parameters */
51 struct flowi fl; /* flowi template for xmit */
52 struct dst_cache dst_cache; /* cached dst */
53 struct gro_cells gro_cells;
54
55 int err_count;
56 unsigned long err_time;
57
58 /* These fields used only by GRE */
59 __u32 i_seqno; /* The last seen seqno */
60 __u32 o_seqno; /* The last output seqno */
61 int hlen; /* tun_hlen + encap_hlen */
62 int tun_hlen; /* Precalculated header length */
63 int encap_hlen; /* Encap header length (FOU,GUE) */
64 struct ip_tunnel_encap encap;
65 int mlink;
66};
67
68struct ip6_tnl_encap_ops {
69 size_t (*encap_hlen)(struct ip_tunnel_encap *e);
70 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
71 u8 *protocol, struct flowi6 *fl6);
72};
73
74#ifdef CONFIG_INET
75
76extern const struct ip6_tnl_encap_ops __rcu *
77 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS];
78
79int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
80 unsigned int num);
81int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
82 unsigned int num);
83int ip6_tnl_encap_setup(struct ip6_tnl *t,
84 struct ip_tunnel_encap *ipencap);
85
86static inline int ip6_encap_hlen(struct ip_tunnel_encap *e)
87{
88 const struct ip6_tnl_encap_ops *ops;
89 int hlen = -EINVAL;
90
91 if (e->type == TUNNEL_ENCAP_NONE)
92 return 0;
93
94 if (e->type >= MAX_IPTUN_ENCAP_OPS)
95 return -EINVAL;
96
97 rcu_read_lock();
98 ops = rcu_dereference(ip6tun_encaps[e->type]);
99 if (likely(ops && ops->encap_hlen))
100 hlen = ops->encap_hlen(e);
101 rcu_read_unlock();
102
103 return hlen;
104}
105
106static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t,
107 u8 *protocol, struct flowi6 *fl6)
108{
109 const struct ip6_tnl_encap_ops *ops;
110 int ret = -EINVAL;
111
112 if (t->encap.type == TUNNEL_ENCAP_NONE)
113 return 0;
114
115 if (t->encap.type >= MAX_IPTUN_ENCAP_OPS)
116 return -EINVAL;
117
118 rcu_read_lock();
119 ops = rcu_dereference(ip6tun_encaps[t->encap.type]);
120 if (likely(ops && ops->build_header))
121 ret = ops->build_header(skb, &t->encap, protocol, fl6);
122 rcu_read_unlock();
123
124 return ret;
125}
126
127/* Tunnel encapsulation limit destination sub-option */
128
129struct ipv6_tlv_tnl_enc_lim {
130 __u8 type; /* type-code for option */
131 __u8 length; /* option length */
132 __u8 encap_limit; /* tunnel encapsulation limit */
133} __packed;
134
135int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
136 const struct in6_addr *raddr);
137int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
138 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
139 bool log_ecn_error);
140int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
141 const struct in6_addr *raddr);
142int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
143 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __u8 proto);
144__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw);
145__u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
146 const struct in6_addr *raddr);
147struct net *ip6_tnl_get_link_net(const struct net_device *dev);
148int ip6_tnl_get_iflink(const struct net_device *dev);
149int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu);
150
151static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
152 struct net_device *dev)
153{
154 int pkt_len, err;
155
156 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
157 pkt_len = skb->len - skb_inner_network_offset(skb);
158 err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb);
159 if (unlikely(net_xmit_eval(err)))
160 pkt_len = -1;
161 iptunnel_xmit_stats(dev, pkt_len);
162}
163#endif
164#endif