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 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,
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,
41 sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
48 kernel_sock_shutdown(sock, SHUT_RDWR);
54 EXPORT_SYMBOL(udp_sock_create4);
56 void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
57 struct udp_tunnel_sock_cfg *cfg)
59 struct sock *sk = sock->sk;
61 /* Disable multicast loopback */
62 inet_sk(sk)->mc_loop = 0;
64 /* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
65 inet_inc_convert_csum(sk);
67 rcu_assign_sk_user_data(sk, cfg->sk_user_data);
69 udp_sk(sk)->encap_type = cfg->encap_type;
70 udp_sk(sk)->encap_rcv = cfg->encap_rcv;
71 udp_sk(sk)->encap_err_lookup = cfg->encap_err_lookup;
72 udp_sk(sk)->encap_destroy = cfg->encap_destroy;
73 udp_sk(sk)->gro_receive = cfg->gro_receive;
74 udp_sk(sk)->gro_complete = cfg->gro_complete;
76 udp_tunnel_encap_enable(sock);
78 EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
80 void udp_tunnel_push_rx_port(struct net_device *dev, struct socket *sock,
83 struct sock *sk = sock->sk;
84 struct udp_tunnel_info ti;
86 if (!dev->netdev_ops->ndo_udp_tunnel_add ||
87 !(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT))
91 ti.sa_family = sk->sk_family;
92 ti.port = inet_sk(sk)->inet_sport;
94 dev->netdev_ops->ndo_udp_tunnel_add(dev, &ti);
96 EXPORT_SYMBOL_GPL(udp_tunnel_push_rx_port);
98 void udp_tunnel_drop_rx_port(struct net_device *dev, struct socket *sock,
101 struct sock *sk = sock->sk;
102 struct udp_tunnel_info ti;
104 if (!dev->netdev_ops->ndo_udp_tunnel_del ||
105 !(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT))
109 ti.sa_family = sk->sk_family;
110 ti.port = inet_sk(sk)->inet_sport;
112 dev->netdev_ops->ndo_udp_tunnel_del(dev, &ti);
114 EXPORT_SYMBOL_GPL(udp_tunnel_drop_rx_port);
116 /* Notify netdevs that UDP port started listening */
117 void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type)
119 struct sock *sk = sock->sk;
120 struct net *net = sock_net(sk);
121 struct udp_tunnel_info ti;
122 struct net_device *dev;
125 ti.sa_family = sk->sk_family;
126 ti.port = inet_sk(sk)->inet_sport;
129 for_each_netdev_rcu(net, dev) {
130 if (!dev->netdev_ops->ndo_udp_tunnel_add)
132 if (!(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT))
134 dev->netdev_ops->ndo_udp_tunnel_add(dev, &ti);
138 EXPORT_SYMBOL_GPL(udp_tunnel_notify_add_rx_port);
140 /* Notify netdevs that UDP port is no more listening */
141 void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type)
143 struct sock *sk = sock->sk;
144 struct net *net = sock_net(sk);
145 struct udp_tunnel_info ti;
146 struct net_device *dev;
149 ti.sa_family = sk->sk_family;
150 ti.port = inet_sk(sk)->inet_sport;
153 for_each_netdev_rcu(net, dev) {
154 if (!dev->netdev_ops->ndo_udp_tunnel_del)
156 if (!(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT))
158 dev->netdev_ops->ndo_udp_tunnel_del(dev, &ti);
162 EXPORT_SYMBOL_GPL(udp_tunnel_notify_del_rx_port);
164 void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
165 __be32 src, __be32 dst, __u8 tos, __u8 ttl,
166 __be16 df, __be16 src_port, __be16 dst_port,
167 bool xnet, bool nocheck)
171 __skb_push(skb, sizeof(*uh));
172 skb_reset_transport_header(skb);
176 uh->source = src_port;
177 uh->len = htons(skb->len);
179 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
181 udp_set_csum(nocheck, skb, src, dst, skb->len);
183 iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df, xnet);
185 EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
187 void udp_tunnel_sock_release(struct socket *sock)
189 rcu_assign_sk_user_data(sock->sk, NULL);
190 kernel_sock_shutdown(sock, SHUT_RDWR);
193 EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
195 struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
196 __be16 flags, __be64 tunnel_id, int md_size)
198 struct metadata_dst *tun_dst;
199 struct ip_tunnel_info *info;
201 if (family == AF_INET)
202 tun_dst = ip_tun_rx_dst(skb, flags, tunnel_id, md_size);
204 tun_dst = ipv6_tun_rx_dst(skb, flags, tunnel_id, md_size);
208 info = &tun_dst->u.tun_info;
209 info->key.tp_src = udp_hdr(skb)->source;
210 info->key.tp_dst = udp_hdr(skb)->dest;
211 if (udp_hdr(skb)->check)
212 info->key.tun_flags |= TUNNEL_CSUM;
215 EXPORT_SYMBOL_GPL(udp_tun_rx_dst);
217 MODULE_LICENSE("GPL");