1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NET_IP6_TUNNEL_H
3 #define _NET_IP6_TUNNEL_H
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>
12 #define IP6TUNNEL_ERR_TIMEO (30*HZ)
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
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 */
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 */
43 struct ip6_tnl __rcu *next; /* next tunnel in list */
44 struct net_device *dev; /* virtual device associated with tunnel */
45 struct net *net; /* netns for packet i/o */
46 struct __ip6_tnl_parm parms; /* tunnel configuration parameters */
47 struct flowi fl; /* flowi template for xmit */
48 struct dst_cache dst_cache; /* cached dst */
49 struct gro_cells gro_cells;
52 unsigned long err_time;
54 /* These fields used only by GRE */
55 __u32 i_seqno; /* The last seen seqno */
56 __u32 o_seqno; /* The last output seqno */
57 int hlen; /* tun_hlen + encap_hlen */
58 int tun_hlen; /* Precalculated header length */
59 int encap_hlen; /* Encap header length (FOU,GUE) */
60 struct ip_tunnel_encap encap;
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);
72 extern const struct ip6_tnl_encap_ops __rcu *
73 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS];
75 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
77 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
79 int ip6_tnl_encap_setup(struct ip6_tnl *t,
80 struct ip_tunnel_encap *ipencap);
82 static inline int ip6_encap_hlen(struct ip_tunnel_encap *e)
84 const struct ip6_tnl_encap_ops *ops;
87 if (e->type == TUNNEL_ENCAP_NONE)
90 if (e->type >= MAX_IPTUN_ENCAP_OPS)
94 ops = rcu_dereference(ip6tun_encaps[e->type]);
95 if (likely(ops && ops->encap_hlen))
96 hlen = ops->encap_hlen(e);
102 static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t,
103 u8 *protocol, struct flowi6 *fl6)
105 const struct ip6_tnl_encap_ops *ops;
108 if (t->encap.type == TUNNEL_ENCAP_NONE)
111 if (t->encap.type >= MAX_IPTUN_ENCAP_OPS)
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);
123 /* Tunnel encapsulation limit destination sub-option */
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 */
131 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
132 const struct in6_addr *raddr);
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,
136 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
137 const struct in6_addr *raddr);
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);
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);
143 struct net *ip6_tnl_get_link_net(const struct net_device *dev);
144 int ip6_tnl_get_iflink(const struct net_device *dev);
145 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu);
147 static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
148 struct net_device *dev)
152 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
153 pkt_len = skb->len - skb_inner_network_offset(skb);
154 err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb);
155 if (unlikely(net_xmit_eval(err)))
157 iptunnel_xmit_stats(dev, pkt_len);