tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 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 sk_buff *skb,
87 struct net_device *dev, struct in6_addr *saddr,
88 struct in6_addr *daddr,
89 __u8 prio, __u8 ttl, __be16 src_port,
90 __be16 dst_port, bool nocheck);
91#endif
92
93void udp_tunnel_sock_release(struct socket *sock);
94
95static inline struct sk_buff *udp_tunnel_handle_offloads(struct sk_buff *skb,
96 bool udp_csum)
97{
98 int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
99
100 return iptunnel_handle_offloads(skb, udp_csum, type);
101}
102
103static inline void udp_tunnel_gro_complete(struct sk_buff *skb, int nhoff)
104{
105 struct udphdr *uh;
106
107 uh = (struct udphdr *)(skb->data + nhoff - sizeof(struct udphdr));
108 skb_shinfo(skb)->gso_type |= uh->check ?
109 SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
110}
111
112static inline void udp_tunnel_encap_enable(struct socket *sock)
113{
114#if IS_ENABLED(CONFIG_IPV6)
115 if (sock->sk->sk_family == PF_INET6)
116 ipv6_stub->udpv6_encap_enable();
117 else
118#endif
119 udp_encap_enable();
120}
121
122#endif