1#ifndef __NET_UDP_TUNNEL_H
2#define __NET_UDP_TUNNEL_H
3
4#include <net/ip_tunnels.h>
5#include <net/udp.h>
6
7#if IS_ENABLED(CONFIG_IPV6)
8#include <net/ipv6.h>
9#include <net/addrconf.h>
10#endif
11
12struct udp_port_cfg {
13	u8			family;
14
15	/* Used only for kernel-created sockets */
16	union {
17		struct in_addr		local_ip;
18#if IS_ENABLED(CONFIG_IPV6)
19		struct in6_addr		local_ip6;
20#endif
21	};
22
23	union {
24		struct in_addr		peer_ip;
25#if IS_ENABLED(CONFIG_IPV6)
26		struct in6_addr		peer_ip6;
27#endif
28	};
29
30	__be16			local_udp_port;
31	__be16			peer_udp_port;
32	unsigned int		use_udp_checksums:1,
33				use_udp6_tx_checksums:1,
34				use_udp6_rx_checksums:1;
35};
36
37int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
38		     struct socket **sockp);
39
40#if IS_ENABLED(CONFIG_IPV6)
41int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
42		     struct socket **sockp);
43#else
44static inline int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
45				   struct socket **sockp)
46{
47	return 0;
48}
49#endif
50
51static inline int udp_sock_create(struct net *net,
52				  struct udp_port_cfg *cfg,
53				  struct socket **sockp)
54{
55	if (cfg->family == AF_INET)
56		return udp_sock_create4(net, cfg, sockp);
57
58	if (cfg->family == AF_INET6)
59		return udp_sock_create6(net, cfg, sockp);
60
61	return -EPFNOSUPPORT;
62}
63
64typedef int (*udp_tunnel_encap_rcv_t)(struct sock *sk, struct sk_buff *skb);
65typedef void (*udp_tunnel_encap_destroy_t)(struct sock *sk);
66
67struct udp_tunnel_sock_cfg {
68	void *sk_user_data;     /* user data used by encap_rcv call back */
69	/* Used for setting up udp_sock fields, see udp.h for details */
70	__u8  encap_type;
71	udp_tunnel_encap_rcv_t encap_rcv;
72	udp_tunnel_encap_destroy_t encap_destroy;
73};
74
75/* Setup the given (UDP) sock to receive UDP encapsulated packets */
76void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
77			   struct udp_tunnel_sock_cfg *sock_cfg);
78
79/* Transmit the skb using UDP encapsulation. */
80int udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
81			__be32 src, __be32 dst, __u8 tos, __u8 ttl,
82			__be16 df, __be16 src_port, __be16 dst_port,
83			bool xnet, bool nocheck);
84
85#if IS_ENABLED(CONFIG_IPV6)
86int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
87			 struct sk_buff *skb,
88			 struct net_device *dev, struct in6_addr *saddr,
89			 struct in6_addr *daddr,
90			 __u8 prio, __u8 ttl, __be16 src_port,
91			 __be16 dst_port, bool nocheck);
92#endif
93
94void udp_tunnel_sock_release(struct socket *sock);
95
96static inline struct sk_buff *udp_tunnel_handle_offloads(struct sk_buff *skb,
97							 bool udp_csum)
98{
99	int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
100
101	return iptunnel_handle_offloads(skb, udp_csum, type);
102}
103
104static inline void udp_tunnel_gro_complete(struct sk_buff *skb, int nhoff)
105{
106	struct udphdr *uh;
107
108	uh = (struct udphdr *)(skb->data + nhoff - sizeof(struct udphdr));
109	skb_shinfo(skb)->gso_type |= uh->check ?
110				SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
111}
112
113static inline void udp_tunnel_encap_enable(struct socket *sock)
114{
115#if IS_ENABLED(CONFIG_IPV6)
116	if (sock->sk->sk_family == PF_INET6)
117		ipv6_stub->udpv6_encap_enable();
118	else
119#endif
120		udp_encap_enable();
121}
122
123#endif
124