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
12 struct 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
38 int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
39 struct socket **sockp);
40
41 #if IS_ENABLED(CONFIG_IPV6)
42 int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
43 struct socket **sockp);
44 #else
udp_sock_create6(struct net * net,struct udp_port_cfg * cfg,struct socket ** sockp)45 static 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
udp_sock_create(struct net * net,struct udp_port_cfg * cfg,struct socket ** sockp)52 static 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
65 typedef int (*udp_tunnel_encap_rcv_t)(struct sock *sk, struct sk_buff *skb);
66 typedef void (*udp_tunnel_encap_destroy_t)(struct sock *sk);
67
68 struct 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 */
77 void 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. */
81 int 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)
87 int 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
95 void udp_tunnel_sock_release(struct socket *sock);
96
97 struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
98 __be16 flags, __be64 tunnel_id,
99 int md_size);
100
udp_tunnel_handle_offloads(struct sk_buff * skb,bool udp_csum)101 static 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
udp_tunnel_gro_complete(struct sk_buff * skb,int nhoff)109 static 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
udp_tunnel_encap_enable(struct socket * sock)118 static 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