1 #include <linux/module.h>
2 #include <linux/errno.h>
3 #include <linux/socket.h>
5 #include <linux/types.h>
6 #include <linux/kernel.h>
8 #include <net/udp_tunnel.h>
9 #include <net/net_namespace.h>
11 int udp_sock_create4(struct net
*net
, struct udp_port_cfg
*cfg
,
12 struct socket
**sockp
)
15 struct socket
*sock
= NULL
;
16 struct sockaddr_in udp_addr
;
18 err
= sock_create_kern(net
, AF_INET
, SOCK_DGRAM
, 0, &sock
);
22 udp_addr
.sin_family
= AF_INET
;
23 udp_addr
.sin_addr
= cfg
->local_ip
;
24 udp_addr
.sin_port
= cfg
->local_udp_port
;
25 err
= kernel_bind(sock
, (struct sockaddr
*)&udp_addr
,
30 if (cfg
->peer_udp_port
) {
31 udp_addr
.sin_family
= AF_INET
;
32 udp_addr
.sin_addr
= cfg
->peer_ip
;
33 udp_addr
.sin_port
= cfg
->peer_udp_port
;
34 err
= kernel_connect(sock
, (struct sockaddr
*)&udp_addr
,
40 sock
->sk
->sk_no_check_tx
= !cfg
->use_udp_checksums
;
47 kernel_sock_shutdown(sock
, SHUT_RDWR
);
53 EXPORT_SYMBOL(udp_sock_create4
);
55 void setup_udp_tunnel_sock(struct net
*net
, struct socket
*sock
,
56 struct udp_tunnel_sock_cfg
*cfg
)
58 struct sock
*sk
= sock
->sk
;
60 /* Disable multicast loopback */
61 inet_sk(sk
)->mc_loop
= 0;
63 /* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
64 inet_inc_convert_csum(sk
);
66 rcu_assign_sk_user_data(sk
, cfg
->sk_user_data
);
68 udp_sk(sk
)->encap_type
= cfg
->encap_type
;
69 udp_sk(sk
)->encap_rcv
= cfg
->encap_rcv
;
70 udp_sk(sk
)->encap_destroy
= cfg
->encap_destroy
;
72 udp_tunnel_encap_enable(sock
);
74 EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock
);
76 int udp_tunnel_xmit_skb(struct rtable
*rt
, struct sock
*sk
, struct sk_buff
*skb
,
77 __be32 src
, __be32 dst
, __u8 tos
, __u8 ttl
,
78 __be16 df
, __be16 src_port
, __be16 dst_port
,
79 bool xnet
, bool nocheck
)
83 __skb_push(skb
, sizeof(*uh
));
84 skb_reset_transport_header(skb
);
88 uh
->source
= src_port
;
89 uh
->len
= htons(skb
->len
);
91 udp_set_csum(nocheck
, skb
, src
, dst
, skb
->len
);
93 return iptunnel_xmit(sk
, rt
, skb
, src
, dst
, IPPROTO_UDP
,
96 EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb
);
98 void udp_tunnel_sock_release(struct socket
*sock
)
100 rcu_assign_sk_user_data(sock
->sk
, NULL
);
101 kernel_sock_shutdown(sock
, SHUT_RDWR
);
104 EXPORT_SYMBOL_GPL(udp_tunnel_sock_release
);
106 MODULE_LICENSE("GPL");
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