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>
7 #include <net/dst_metadata.h>
8 #include <net/net_namespace.h>
10 #include <net/udp_tunnel.h>
12 int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
13 struct socket **sockp)
16 struct socket *sock = NULL;
17 struct sockaddr_in udp_addr;
19 err = sock_create_kern(net, AF_INET, SOCK_DGRAM, 0, &sock);
23 if (cfg->bind_ifindex) {
24 err = kernel_setsockopt(sock, SOL_SOCKET, SO_BINDTOIFINDEX,
25 (void *)&cfg->bind_ifindex,
26 sizeof(cfg->bind_ifindex));
31 udp_addr.sin_family = AF_INET;
32 udp_addr.sin_addr = cfg->local_ip;
33 udp_addr.sin_port = cfg->local_udp_port;
34 err = kernel_bind(sock, (struct sockaddr *)&udp_addr,
39 if (cfg->peer_udp_port) {
40 udp_addr.sin_family = AF_INET;
41 udp_addr.sin_addr = cfg->peer_ip;
42 udp_addr.sin_port = cfg->peer_udp_port;
43 err = kernel_connect(sock, (struct sockaddr *)&udp_addr,
49 sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
56 kernel_sock_shutdown(sock, SHUT_RDWR);
62 EXPORT_SYMBOL(udp_sock_create4);
64 void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
65 struct udp_tunnel_sock_cfg *cfg)
67 struct sock *sk = sock->sk;
69 /* Disable multicast loopback */
70 inet_sk(sk)->mc_loop = 0;
72 /* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
73 inet_inc_convert_csum(sk);
75 rcu_assign_sk_user_data(sk, cfg->sk_user_data);
77 udp_sk(sk)->encap_type = cfg->encap_type;
78 udp_sk(sk)->encap_rcv = cfg->encap_rcv;
79 udp_sk(sk)->encap_err_lookup = cfg->encap_err_lookup;
80 udp_sk(sk)->encap_destroy = cfg->encap_destroy;
81 udp_sk(sk)->gro_receive = cfg->gro_receive;
82 udp_sk(sk)->gro_complete = cfg->gro_complete;
84 udp_tunnel_encap_enable(sock);
86 EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
88 void udp_tunnel_push_rx_port(struct net_device *dev, struct socket *sock,
91 struct sock *sk = sock->sk;
92 struct udp_tunnel_info ti;
94 if (!dev->netdev_ops->ndo_udp_tunnel_add ||
95 !(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT))
99 ti.sa_family = sk->sk_family;
100 ti.port = inet_sk(sk)->inet_sport;
102 dev->netdev_ops->ndo_udp_tunnel_add(dev, &ti);
104 EXPORT_SYMBOL_GPL(udp_tunnel_push_rx_port);
106 void udp_tunnel_drop_rx_port(struct net_device *dev, struct socket *sock,
109 struct sock *sk = sock->sk;
110 struct udp_tunnel_info ti;
112 if (!dev->netdev_ops->ndo_udp_tunnel_del ||
113 !(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT))
117 ti.sa_family = sk->sk_family;
118 ti.port = inet_sk(sk)->inet_sport;
120 dev->netdev_ops->ndo_udp_tunnel_del(dev, &ti);
122 EXPORT_SYMBOL_GPL(udp_tunnel_drop_rx_port);
124 /* Notify netdevs that UDP port started listening */
125 void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type)
127 struct sock *sk = sock->sk;
128 struct net *net = sock_net(sk);
129 struct udp_tunnel_info ti;
130 struct net_device *dev;
133 ti.sa_family = sk->sk_family;
134 ti.port = inet_sk(sk)->inet_sport;
137 for_each_netdev_rcu(net, dev) {
138 if (!dev->netdev_ops->ndo_udp_tunnel_add)
140 if (!(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT))
142 dev->netdev_ops->ndo_udp_tunnel_add(dev, &ti);
146 EXPORT_SYMBOL_GPL(udp_tunnel_notify_add_rx_port);
148 /* Notify netdevs that UDP port is no more listening */
149 void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type)
151 struct sock *sk = sock->sk;
152 struct net *net = sock_net(sk);
153 struct udp_tunnel_info ti;
154 struct net_device *dev;
157 ti.sa_family = sk->sk_family;
158 ti.port = inet_sk(sk)->inet_sport;
161 for_each_netdev_rcu(net, dev) {
162 if (!dev->netdev_ops->ndo_udp_tunnel_del)
164 if (!(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT))
166 dev->netdev_ops->ndo_udp_tunnel_del(dev, &ti);
170 EXPORT_SYMBOL_GPL(udp_tunnel_notify_del_rx_port);
172 void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
173 __be32 src, __be32 dst, __u8 tos, __u8 ttl,
174 __be16 df, __be16 src_port, __be16 dst_port,
175 bool xnet, bool nocheck)
179 __skb_push(skb, sizeof(*uh));
180 skb_reset_transport_header(skb);
184 uh->source = src_port;
185 uh->len = htons(skb->len);
187 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
189 udp_set_csum(nocheck, skb, src, dst, skb->len);
191 iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df, xnet);
193 EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
195 void udp_tunnel_sock_release(struct socket *sock)
197 rcu_assign_sk_user_data(sock->sk, NULL);
198 kernel_sock_shutdown(sock, SHUT_RDWR);
201 EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
203 struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
204 __be16 flags, __be64 tunnel_id, int md_size)
206 struct metadata_dst *tun_dst;
207 struct ip_tunnel_info *info;
209 if (family == AF_INET)
210 tun_dst = ip_tun_rx_dst(skb, flags, tunnel_id, md_size);
212 tun_dst = ipv6_tun_rx_dst(skb, flags, tunnel_id, md_size);
216 info = &tun_dst->u.tun_info;
217 info->key.tp_src = udp_hdr(skb)->source;
218 info->key.tp_dst = udp_hdr(skb)->dest;
219 if (udp_hdr(skb)->check)
220 info->key.tun_flags |= TUNNEL_CSUM;
223 EXPORT_SYMBOL_GPL(udp_tun_rx_dst);
225 MODULE_LICENSE("GPL");