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/dst_metadata.h>
8 #include <net/net_namespace.h>
9 #include <net/udp.h>
10 #include <net/udp_tunnel.h>
11
udp_sock_create4(struct net * net,struct udp_port_cfg * cfg,struct socket ** sockp)12 int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
13 struct socket **sockp)
14 {
15 int err;
16 struct socket *sock = NULL;
17 struct sockaddr_in udp_addr;
18
19 err = sock_create_kern(net, AF_INET, SOCK_DGRAM, 0, &sock);
20 if (err < 0)
21 goto error;
22
23 udp_addr.sin_family = AF_INET;
24 udp_addr.sin_addr = cfg->local_ip;
25 udp_addr.sin_port = cfg->local_udp_port;
26 err = kernel_bind(sock, (struct sockaddr *)&udp_addr,
27 sizeof(udp_addr));
28 if (err < 0)
29 goto error;
30
31 if (cfg->peer_udp_port) {
32 udp_addr.sin_family = AF_INET;
33 udp_addr.sin_addr = cfg->peer_ip;
34 udp_addr.sin_port = cfg->peer_udp_port;
35 err = kernel_connect(sock, (struct sockaddr *)&udp_addr,
36 sizeof(udp_addr), 0);
37 if (err < 0)
38 goto error;
39 }
40
41 sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
42
43 *sockp = sock;
44 return 0;
45
46 error:
47 if (sock) {
48 kernel_sock_shutdown(sock, SHUT_RDWR);
49 sock_release(sock);
50 }
51 *sockp = NULL;
52 return err;
53 }
54 EXPORT_SYMBOL(udp_sock_create4);
55
setup_udp_tunnel_sock(struct net * net,struct socket * sock,struct udp_tunnel_sock_cfg * cfg)56 void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
57 struct udp_tunnel_sock_cfg *cfg)
58 {
59 struct sock *sk = sock->sk;
60
61 /* Disable multicast loopback */
62 inet_sk(sk)->mc_loop = 0;
63
64 /* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
65 inet_inc_convert_csum(sk);
66
67 rcu_assign_sk_user_data(sk, cfg->sk_user_data);
68
69 udp_sk(sk)->encap_type = cfg->encap_type;
70 udp_sk(sk)->encap_rcv = cfg->encap_rcv;
71 udp_sk(sk)->encap_destroy = cfg->encap_destroy;
72
73 udp_tunnel_encap_enable(sock);
74 }
75 EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
76
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)77 int udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
78 __be32 src, __be32 dst, __u8 tos, __u8 ttl,
79 __be16 df, __be16 src_port, __be16 dst_port,
80 bool xnet, bool nocheck)
81 {
82 struct udphdr *uh;
83
84 __skb_push(skb, sizeof(*uh));
85 skb_reset_transport_header(skb);
86 uh = udp_hdr(skb);
87
88 uh->dest = dst_port;
89 uh->source = src_port;
90 uh->len = htons(skb->len);
91
92 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
93
94 udp_set_csum(nocheck, skb, src, dst, skb->len);
95
96 return iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP,
97 tos, ttl, df, xnet);
98 }
99 EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
100
udp_tunnel_sock_release(struct socket * sock)101 void udp_tunnel_sock_release(struct socket *sock)
102 {
103 rcu_assign_sk_user_data(sock->sk, NULL);
104 kernel_sock_shutdown(sock, SHUT_RDWR);
105 sock_release(sock);
106 }
107 EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
108
udp_tun_rx_dst(struct sk_buff * skb,unsigned short family,__be16 flags,__be64 tunnel_id,int md_size)109 struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
110 __be16 flags, __be64 tunnel_id, int md_size)
111 {
112 struct metadata_dst *tun_dst;
113 struct ip_tunnel_info *info;
114
115 if (family == AF_INET)
116 tun_dst = ip_tun_rx_dst(skb, flags, tunnel_id, md_size);
117 else
118 tun_dst = ipv6_tun_rx_dst(skb, flags, tunnel_id, md_size);
119 if (!tun_dst)
120 return NULL;
121
122 info = &tun_dst->u.tun_info;
123 info->key.tp_src = udp_hdr(skb)->source;
124 info->key.tp_dst = udp_hdr(skb)->dest;
125 if (udp_hdr(skb)->check)
126 info->key.tun_flags |= TUNNEL_CSUM;
127 return tun_dst;
128 }
129 EXPORT_SYMBOL_GPL(udp_tun_rx_dst);
130
131 MODULE_LICENSE("GPL");
132