1 #include <linux/module.h>
2 #include <linux/errno.h>
3 #include <linux/socket.h>
4 #include <linux/udp.h>
5 #include <linux/types.h>
6 #include <linux/kernel.h>
7 #include <net/udp.h>
8 #include <net/udp_tunnel.h>
9 #include <net/net_namespace.h>
10
udp_sock_create4(struct net * net,struct udp_port_cfg * cfg,struct socket ** sockp)11 int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
12 struct socket **sockp)
13 {
14 int err;
15 struct socket *sock = NULL;
16 struct sockaddr_in udp_addr;
17
18 err = sock_create_kern(AF_INET, SOCK_DGRAM, 0, &sock);
19 if (err < 0)
20 goto error;
21
22 sk_change_net(sock->sk, net);
23
24 udp_addr.sin_family = AF_INET;
25 udp_addr.sin_addr = cfg->local_ip;
26 udp_addr.sin_port = cfg->local_udp_port;
27 err = kernel_bind(sock, (struct sockaddr *)&udp_addr,
28 sizeof(udp_addr));
29 if (err < 0)
30 goto error;
31
32 if (cfg->peer_udp_port) {
33 udp_addr.sin_family = AF_INET;
34 udp_addr.sin_addr = cfg->peer_ip;
35 udp_addr.sin_port = cfg->peer_udp_port;
36 err = kernel_connect(sock, (struct sockaddr *)&udp_addr,
37 sizeof(udp_addr), 0);
38 if (err < 0)
39 goto error;
40 }
41
42 sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
43
44 *sockp = sock;
45 return 0;
46
47 error:
48 if (sock) {
49 kernel_sock_shutdown(sock, SHUT_RDWR);
50 sk_release_kernel(sock->sk);
51 }
52 *sockp = NULL;
53 return err;
54 }
55 EXPORT_SYMBOL(udp_sock_create4);
56
setup_udp_tunnel_sock(struct net * net,struct socket * sock,struct udp_tunnel_sock_cfg * cfg)57 void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
58 struct udp_tunnel_sock_cfg *cfg)
59 {
60 struct sock *sk = sock->sk;
61
62 /* Disable multicast loopback */
63 inet_sk(sk)->mc_loop = 0;
64
65 /* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
66 inet_inc_convert_csum(sk);
67
68 rcu_assign_sk_user_data(sk, cfg->sk_user_data);
69
70 udp_sk(sk)->encap_type = cfg->encap_type;
71 udp_sk(sk)->encap_rcv = cfg->encap_rcv;
72 udp_sk(sk)->encap_destroy = cfg->encap_destroy;
73
74 udp_tunnel_encap_enable(sock);
75 }
76 EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
77
udp_tunnel_xmit_skb(struct rtable * rt,struct sock * sk,struct sk_buff * skb,__be32 src,__be32 dst,__u8 tos,__u8 ttl,__be16 df,__be16 src_port,__be16 dst_port,bool xnet,bool nocheck)78 int udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
79 __be32 src, __be32 dst, __u8 tos, __u8 ttl,
80 __be16 df, __be16 src_port, __be16 dst_port,
81 bool xnet, bool nocheck)
82 {
83 struct udphdr *uh;
84
85 __skb_push(skb, sizeof(*uh));
86 skb_reset_transport_header(skb);
87 uh = udp_hdr(skb);
88
89 uh->dest = dst_port;
90 uh->source = src_port;
91 uh->len = htons(skb->len);
92
93 udp_set_csum(nocheck, skb, src, dst, skb->len);
94
95 return iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP,
96 tos, ttl, df, xnet);
97 }
98 EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
99
udp_tunnel_sock_release(struct socket * sock)100 void udp_tunnel_sock_release(struct socket *sock)
101 {
102 rcu_assign_sk_user_data(sock->sk, NULL);
103 kernel_sock_shutdown(sock, SHUT_RDWR);
104 sk_release_kernel(sock->sk);
105 }
106 EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
107
108 MODULE_LICENSE("GPL");
109