tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef _NET_IP6_TUNNEL_H
2#define _NET_IP6_TUNNEL_H
3
4#include <linux/ipv6.h>
5#include <linux/netdevice.h>
6#include <linux/if_tunnel.h>
7#include <linux/ip6_tunnel.h>
8#include <net/ip_tunnels.h>
9#include <net/dst_cache.h>
10
11#define IP6TUNNEL_ERR_TIMEO (30*HZ)
12
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
17/* determine capability on a per-packet basis */
18#define IP6_TNL_F_CAP_PER_PACKET 0x40000
19
20struct __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 */
26 bool collect_md;
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;
36
37 __u32 fwmark;
38};
39
40/* IPv6 tunnel */
41struct ip6_tnl {
42 struct ip6_tnl __rcu *next; /* next tunnel in list */
43 struct net_device *dev; /* virtual device associated with tunnel */
44 struct net *net; /* netns for packet i/o */
45 struct __ip6_tnl_parm parms; /* tunnel configuration parameters */
46 struct flowi fl; /* flowi template for xmit */
47 struct dst_cache dst_cache; /* cached dst */
48 struct gro_cells gro_cells;
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 */
56 int hlen; /* tun_hlen + encap_hlen */
57 int tun_hlen; /* Precalculated header length */
58 int encap_hlen; /* Encap header length (FOU,GUE) */
59 struct ip_tunnel_encap encap;
60 int mlink;
61};
62
63struct 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);
67};
68
69#ifdef CONFIG_INET
70
71extern const struct ip6_tnl_encap_ops __rcu *
72 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS];
73
74int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
75 unsigned int num);
76int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
77 unsigned int num);
78int ip6_tnl_encap_setup(struct ip6_tnl *t,
79 struct ip_tunnel_encap *ipencap);
80
81static 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
101static 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
122/* Tunnel encapsulation limit destination sub-option */
123
124struct ipv6_tlv_tnl_enc_lim {
125 __u8 type; /* type-code for option */
126 __u8 length; /* option length */
127 __u8 encap_limit; /* tunnel encapsulation limit */
128} __packed;
129
130int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
131 const struct in6_addr *raddr);
132int 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);
135int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
136 const struct in6_addr *raddr);
137int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
138 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __u8 proto);
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);
142struct net *ip6_tnl_get_link_net(const struct net_device *dev);
143int ip6_tnl_get_iflink(const struct net_device *dev);
144int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu);
145
146static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
147 struct net_device *dev)
148{
149 int pkt_len, err;
150
151 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
152 pkt_len = skb->len - skb_inner_network_offset(skb);
153 err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb);
154 if (unlikely(net_xmit_eval(err)))
155 pkt_len = -1;
156 iptunnel_xmit_stats(dev, pkt_len);
157}
158#endif
159#endif