1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/module.h>
3 #include <linux/errno.h>
4 #include <linux/socket.h>
6 #include <linux/types.h>
7 #include <linux/kernel.h>
8 #include <net/dst_metadata.h>
9 #include <net/net_namespace.h>
11 #include <net/udp_tunnel.h>
13 int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
14 struct socket **sockp)
17 struct socket *sock = NULL;
18 struct sockaddr_in udp_addr;
20 err = sock_create_kern(net, AF_INET, SOCK_DGRAM, 0, &sock);
24 if (cfg->bind_ifindex) {
25 err = sock_bindtoindex(sock->sk, cfg->bind_ifindex, true);
30 udp_addr.sin_family = AF_INET;
31 udp_addr.sin_addr = cfg->local_ip;
32 udp_addr.sin_port = cfg->local_udp_port;
33 err = kernel_bind(sock, (struct sockaddr *)&udp_addr,
38 if (cfg->peer_udp_port) {
39 udp_addr.sin_family = AF_INET;
40 udp_addr.sin_addr = cfg->peer_ip;
41 udp_addr.sin_port = cfg->peer_udp_port;
42 err = kernel_connect(sock, (struct sockaddr *)&udp_addr,
48 sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
55 kernel_sock_shutdown(sock, SHUT_RDWR);
61 EXPORT_SYMBOL(udp_sock_create4);
63 void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
64 struct udp_tunnel_sock_cfg *cfg)
66 struct sock *sk = sock->sk;
68 /* Disable multicast loopback */
69 inet_sk(sk)->mc_loop = 0;
71 /* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
72 inet_inc_convert_csum(sk);
74 rcu_assign_sk_user_data(sk, cfg->sk_user_data);
76 udp_sk(sk)->encap_type = cfg->encap_type;
77 udp_sk(sk)->encap_rcv = cfg->encap_rcv;
78 udp_sk(sk)->encap_err_lookup = cfg->encap_err_lookup;
79 udp_sk(sk)->encap_destroy = cfg->encap_destroy;
80 udp_sk(sk)->gro_receive = cfg->gro_receive;
81 udp_sk(sk)->gro_complete = cfg->gro_complete;
83 udp_tunnel_encap_enable(sock);
85 EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
87 void udp_tunnel_push_rx_port(struct net_device *dev, struct socket *sock,
90 struct sock *sk = sock->sk;
91 struct udp_tunnel_info ti;
94 ti.sa_family = sk->sk_family;
95 ti.port = inet_sk(sk)->inet_sport;
97 udp_tunnel_nic_add_port(dev, &ti);
99 EXPORT_SYMBOL_GPL(udp_tunnel_push_rx_port);
101 void udp_tunnel_drop_rx_port(struct net_device *dev, struct socket *sock,
104 struct sock *sk = sock->sk;
105 struct udp_tunnel_info ti;
108 ti.sa_family = sk->sk_family;
109 ti.port = inet_sk(sk)->inet_sport;
111 udp_tunnel_nic_del_port(dev, &ti);
113 EXPORT_SYMBOL_GPL(udp_tunnel_drop_rx_port);
115 /* Notify netdevs that UDP port started listening */
116 void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type)
118 struct sock *sk = sock->sk;
119 struct net *net = sock_net(sk);
120 struct udp_tunnel_info ti;
121 struct net_device *dev;
124 ti.sa_family = sk->sk_family;
125 ti.port = inet_sk(sk)->inet_sport;
128 for_each_netdev_rcu(net, dev) {
129 udp_tunnel_nic_add_port(dev, &ti);
133 EXPORT_SYMBOL_GPL(udp_tunnel_notify_add_rx_port);
135 /* Notify netdevs that UDP port is no more listening */
136 void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type)
138 struct sock *sk = sock->sk;
139 struct net *net = sock_net(sk);
140 struct udp_tunnel_info ti;
141 struct net_device *dev;
144 ti.sa_family = sk->sk_family;
145 ti.port = inet_sk(sk)->inet_sport;
148 for_each_netdev_rcu(net, dev) {
149 udp_tunnel_nic_del_port(dev, &ti);
153 EXPORT_SYMBOL_GPL(udp_tunnel_notify_del_rx_port);
155 void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
156 __be32 src, __be32 dst, __u8 tos, __u8 ttl,
157 __be16 df, __be16 src_port, __be16 dst_port,
158 bool xnet, bool nocheck)
162 __skb_push(skb, sizeof(*uh));
163 skb_reset_transport_header(skb);
167 uh->source = src_port;
168 uh->len = htons(skb->len);
170 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
172 udp_set_csum(nocheck, skb, src, dst, skb->len);
174 iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df, xnet);
176 EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
178 void udp_tunnel_sock_release(struct socket *sock)
180 rcu_assign_sk_user_data(sock->sk, NULL);
181 kernel_sock_shutdown(sock, SHUT_RDWR);
184 EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
186 struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
187 __be16 flags, __be64 tunnel_id, int md_size)
189 struct metadata_dst *tun_dst;
190 struct ip_tunnel_info *info;
192 if (family == AF_INET)
193 tun_dst = ip_tun_rx_dst(skb, flags, tunnel_id, md_size);
195 tun_dst = ipv6_tun_rx_dst(skb, flags, tunnel_id, md_size);
199 info = &tun_dst->u.tun_info;
200 info->key.tp_src = udp_hdr(skb)->source;
201 info->key.tp_dst = udp_hdr(skb)->dest;
202 if (udp_hdr(skb)->check)
203 info->key.tun_flags |= TUNNEL_CSUM;
206 EXPORT_SYMBOL_GPL(udp_tun_rx_dst);
208 MODULE_LICENSE("GPL");