1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/module.h>
3 #include <linux/errno.h>
4 #include <linux/socket.h>
5 #include <linux/kernel.h>
6 #include <net/dst_metadata.h>
8 #include <net/udp_tunnel.h>
10 int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
11 struct socket **sockp)
14 struct socket *sock = NULL;
15 struct sockaddr_in udp_addr;
17 err = sock_create_kern(net, AF_INET, SOCK_DGRAM, 0, &sock);
21 if (cfg->bind_ifindex) {
22 err = sock_bindtoindex(sock->sk, cfg->bind_ifindex, true);
27 udp_addr.sin_family = AF_INET;
28 udp_addr.sin_addr = cfg->local_ip;
29 udp_addr.sin_port = cfg->local_udp_port;
30 err = kernel_bind(sock, (struct sockaddr *)&udp_addr,
35 if (cfg->peer_udp_port) {
36 udp_addr.sin_family = AF_INET;
37 udp_addr.sin_addr = cfg->peer_ip;
38 udp_addr.sin_port = cfg->peer_udp_port;
39 err = kernel_connect(sock, (struct sockaddr *)&udp_addr,
45 sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
52 kernel_sock_shutdown(sock, SHUT_RDWR);
58 EXPORT_SYMBOL(udp_sock_create4);
60 void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
61 struct udp_tunnel_sock_cfg *cfg)
63 struct sock *sk = sock->sk;
65 /* Disable multicast loopback */
66 inet_sk(sk)->mc_loop = 0;
68 /* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
69 inet_inc_convert_csum(sk);
71 rcu_assign_sk_user_data(sk, cfg->sk_user_data);
73 udp_sk(sk)->encap_type = cfg->encap_type;
74 udp_sk(sk)->encap_rcv = cfg->encap_rcv;
75 udp_sk(sk)->encap_err_lookup = cfg->encap_err_lookup;
76 udp_sk(sk)->encap_destroy = cfg->encap_destroy;
77 udp_sk(sk)->gro_receive = cfg->gro_receive;
78 udp_sk(sk)->gro_complete = cfg->gro_complete;
80 udp_tunnel_encap_enable(sock);
82 EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
84 void udp_tunnel_push_rx_port(struct net_device *dev, struct socket *sock,
87 struct sock *sk = sock->sk;
88 struct udp_tunnel_info ti;
91 ti.sa_family = sk->sk_family;
92 ti.port = inet_sk(sk)->inet_sport;
94 udp_tunnel_nic_add_port(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;
105 ti.sa_family = sk->sk_family;
106 ti.port = inet_sk(sk)->inet_sport;
108 udp_tunnel_nic_del_port(dev, &ti);
110 EXPORT_SYMBOL_GPL(udp_tunnel_drop_rx_port);
112 /* Notify netdevs that UDP port started listening */
113 void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type)
115 struct sock *sk = sock->sk;
116 struct net *net = sock_net(sk);
117 struct udp_tunnel_info ti;
118 struct net_device *dev;
121 ti.sa_family = sk->sk_family;
122 ti.port = inet_sk(sk)->inet_sport;
125 for_each_netdev_rcu(net, dev) {
126 udp_tunnel_nic_add_port(dev, &ti);
130 EXPORT_SYMBOL_GPL(udp_tunnel_notify_add_rx_port);
132 /* Notify netdevs that UDP port is no more listening */
133 void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type)
135 struct sock *sk = sock->sk;
136 struct net *net = sock_net(sk);
137 struct udp_tunnel_info ti;
138 struct net_device *dev;
141 ti.sa_family = sk->sk_family;
142 ti.port = inet_sk(sk)->inet_sport;
145 for_each_netdev_rcu(net, dev) {
146 udp_tunnel_nic_del_port(dev, &ti);
150 EXPORT_SYMBOL_GPL(udp_tunnel_notify_del_rx_port);
152 void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
153 __be32 src, __be32 dst, __u8 tos, __u8 ttl,
154 __be16 df, __be16 src_port, __be16 dst_port,
155 bool xnet, bool nocheck)
159 __skb_push(skb, sizeof(*uh));
160 skb_reset_transport_header(skb);
164 uh->source = src_port;
165 uh->len = htons(skb->len);
167 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
169 udp_set_csum(nocheck, skb, src, dst, skb->len);
171 iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df, xnet);
173 EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
175 void udp_tunnel_sock_release(struct socket *sock)
177 rcu_assign_sk_user_data(sock->sk, NULL);
178 kernel_sock_shutdown(sock, SHUT_RDWR);
181 EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
183 struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
184 __be16 flags, __be64 tunnel_id, int md_size)
186 struct metadata_dst *tun_dst;
187 struct ip_tunnel_info *info;
189 if (family == AF_INET)
190 tun_dst = ip_tun_rx_dst(skb, flags, tunnel_id, md_size);
192 tun_dst = ipv6_tun_rx_dst(skb, flags, tunnel_id, md_size);
196 info = &tun_dst->u.tun_info;
197 info->key.tp_src = udp_hdr(skb)->source;
198 info->key.tp_dst = udp_hdr(skb)->dest;
199 if (udp_hdr(skb)->check)
200 info->key.tun_flags |= TUNNEL_CSUM;
203 EXPORT_SYMBOL_GPL(udp_tun_rx_dst);
205 MODULE_LICENSE("GPL");