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				ipv6_v6only:1;
36};
37
38int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
39		     struct socket **sockp);
40
41#if IS_ENABLED(CONFIG_IPV6)
42int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
43		     struct socket **sockp);
44#else
45static inline int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
46				   struct socket **sockp)
47{
48	return 0;
49}
50#endif
51
52static inline int udp_sock_create(struct net *net,
53				  struct udp_port_cfg *cfg,
54				  struct socket **sockp)
55{
56	if (cfg->family == AF_INET)
57		return udp_sock_create4(net, cfg, sockp);
58
59	if (cfg->family == AF_INET6)
60		return udp_sock_create6(net, cfg, sockp);
61
62	return -EPFNOSUPPORT;
63}
64
65typedef int (*udp_tunnel_encap_rcv_t)(struct sock *sk, struct sk_buff *skb);
66typedef void (*udp_tunnel_encap_destroy_t)(struct sock *sk);
67
68struct udp_tunnel_sock_cfg {
69	void *sk_user_data;     /* user data used by encap_rcv call back */
70	/* Used for setting up udp_sock fields, see udp.h for details */
71	__u8  encap_type;
72	udp_tunnel_encap_rcv_t encap_rcv;
73	udp_tunnel_encap_destroy_t encap_destroy;
74};
75
76/* Setup the given (UDP) sock to receive UDP encapsulated packets */
77void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
78			   struct udp_tunnel_sock_cfg *sock_cfg);
79
80/* Transmit the skb using UDP encapsulation. */
81int udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
82			__be32 src, __be32 dst, __u8 tos, __u8 ttl,
83			__be16 df, __be16 src_port, __be16 dst_port,
84			bool xnet, bool nocheck);
85
86#if IS_ENABLED(CONFIG_IPV6)
87int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
88			 struct sk_buff *skb,
89			 struct net_device *dev, struct in6_addr *saddr,
90			 struct in6_addr *daddr,
91			 __u8 prio, __u8 ttl, __be16 src_port,
92			 __be16 dst_port, bool nocheck);
93#endif
94
95void udp_tunnel_sock_release(struct socket *sock);
96
97struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
98				    __be16 flags, __be64 tunnel_id,
99				    int md_size);
100
101static inline struct sk_buff *udp_tunnel_handle_offloads(struct sk_buff *skb,
102							 bool udp_csum)
103{
104	int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
105
106	return iptunnel_handle_offloads(skb, udp_csum, type);
107}
108
109static inline void udp_tunnel_gro_complete(struct sk_buff *skb, int nhoff)
110{
111	struct udphdr *uh;
112
113	uh = (struct udphdr *)(skb->data + nhoff - sizeof(struct udphdr));
114	skb_shinfo(skb)->gso_type |= uh->check ?
115				SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
116}
117
118static inline void udp_tunnel_encap_enable(struct socket *sock)
119{
120#if IS_ENABLED(CONFIG_IPV6)
121	if (sock->sk->sk_family == PF_INET6)
122		ipv6_stub->udpv6_encap_enable();
123	else
124#endif
125		udp_encap_enable();
126}
127
128#endif
129