This source file includes following definitions.
- udp_sock_create4
- setup_udp_tunnel_sock
- udp_tunnel_push_rx_port
- udp_tunnel_drop_rx_port
- udp_tunnel_notify_add_rx_port
- udp_tunnel_notify_del_rx_port
- udp_tunnel_xmit_skb
- udp_tunnel_sock_release
- udp_tun_rx_dst
1
2 #include <linux/module.h>
3 #include <linux/errno.h>
4 #include <linux/socket.h>
5 #include <linux/udp.h>
6 #include <linux/types.h>
7 #include <linux/kernel.h>
8 #include <net/dst_metadata.h>
9 #include <net/net_namespace.h>
10 #include <net/udp.h>
11 #include <net/udp_tunnel.h>
12
13 int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
14 struct socket **sockp)
15 {
16 int err;
17 struct socket *sock = NULL;
18 struct sockaddr_in udp_addr;
19
20 err = sock_create_kern(net, AF_INET, SOCK_DGRAM, 0, &sock);
21 if (err < 0)
22 goto error;
23
24 if (cfg->bind_ifindex) {
25 err = kernel_setsockopt(sock, SOL_SOCKET, SO_BINDTOIFINDEX,
26 (void *)&cfg->bind_ifindex,
27 sizeof(cfg->bind_ifindex));
28 if (err < 0)
29 goto error;
30 }
31
32 udp_addr.sin_family = AF_INET;
33 udp_addr.sin_addr = cfg->local_ip;
34 udp_addr.sin_port = cfg->local_udp_port;
35 err = kernel_bind(sock, (struct sockaddr *)&udp_addr,
36 sizeof(udp_addr));
37 if (err < 0)
38 goto error;
39
40 if (cfg->peer_udp_port) {
41 udp_addr.sin_family = AF_INET;
42 udp_addr.sin_addr = cfg->peer_ip;
43 udp_addr.sin_port = cfg->peer_udp_port;
44 err = kernel_connect(sock, (struct sockaddr *)&udp_addr,
45 sizeof(udp_addr), 0);
46 if (err < 0)
47 goto error;
48 }
49
50 sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
51
52 *sockp = sock;
53 return 0;
54
55 error:
56 if (sock) {
57 kernel_sock_shutdown(sock, SHUT_RDWR);
58 sock_release(sock);
59 }
60 *sockp = NULL;
61 return err;
62 }
63 EXPORT_SYMBOL(udp_sock_create4);
64
65 void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
66 struct udp_tunnel_sock_cfg *cfg)
67 {
68 struct sock *sk = sock->sk;
69
70
71 inet_sk(sk)->mc_loop = 0;
72
73
74 inet_inc_convert_csum(sk);
75
76 rcu_assign_sk_user_data(sk, cfg->sk_user_data);
77
78 udp_sk(sk)->encap_type = cfg->encap_type;
79 udp_sk(sk)->encap_rcv = cfg->encap_rcv;
80 udp_sk(sk)->encap_err_lookup = cfg->encap_err_lookup;
81 udp_sk(sk)->encap_destroy = cfg->encap_destroy;
82 udp_sk(sk)->gro_receive = cfg->gro_receive;
83 udp_sk(sk)->gro_complete = cfg->gro_complete;
84
85 udp_tunnel_encap_enable(sock);
86 }
87 EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
88
89 void udp_tunnel_push_rx_port(struct net_device *dev, struct socket *sock,
90 unsigned short type)
91 {
92 struct sock *sk = sock->sk;
93 struct udp_tunnel_info ti;
94
95 if (!dev->netdev_ops->ndo_udp_tunnel_add ||
96 !(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT))
97 return;
98
99 ti.type = type;
100 ti.sa_family = sk->sk_family;
101 ti.port = inet_sk(sk)->inet_sport;
102
103 dev->netdev_ops->ndo_udp_tunnel_add(dev, &ti);
104 }
105 EXPORT_SYMBOL_GPL(udp_tunnel_push_rx_port);
106
107 void udp_tunnel_drop_rx_port(struct net_device *dev, struct socket *sock,
108 unsigned short type)
109 {
110 struct sock *sk = sock->sk;
111 struct udp_tunnel_info ti;
112
113 if (!dev->netdev_ops->ndo_udp_tunnel_del ||
114 !(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT))
115 return;
116
117 ti.type = type;
118 ti.sa_family = sk->sk_family;
119 ti.port = inet_sk(sk)->inet_sport;
120
121 dev->netdev_ops->ndo_udp_tunnel_del(dev, &ti);
122 }
123 EXPORT_SYMBOL_GPL(udp_tunnel_drop_rx_port);
124
125
126 void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type)
127 {
128 struct sock *sk = sock->sk;
129 struct net *net = sock_net(sk);
130 struct udp_tunnel_info ti;
131 struct net_device *dev;
132
133 ti.type = type;
134 ti.sa_family = sk->sk_family;
135 ti.port = inet_sk(sk)->inet_sport;
136
137 rcu_read_lock();
138 for_each_netdev_rcu(net, dev) {
139 if (!dev->netdev_ops->ndo_udp_tunnel_add)
140 continue;
141 if (!(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT))
142 continue;
143 dev->netdev_ops->ndo_udp_tunnel_add(dev, &ti);
144 }
145 rcu_read_unlock();
146 }
147 EXPORT_SYMBOL_GPL(udp_tunnel_notify_add_rx_port);
148
149
150 void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type)
151 {
152 struct sock *sk = sock->sk;
153 struct net *net = sock_net(sk);
154 struct udp_tunnel_info ti;
155 struct net_device *dev;
156
157 ti.type = type;
158 ti.sa_family = sk->sk_family;
159 ti.port = inet_sk(sk)->inet_sport;
160
161 rcu_read_lock();
162 for_each_netdev_rcu(net, dev) {
163 if (!dev->netdev_ops->ndo_udp_tunnel_del)
164 continue;
165 if (!(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT))
166 continue;
167 dev->netdev_ops->ndo_udp_tunnel_del(dev, &ti);
168 }
169 rcu_read_unlock();
170 }
171 EXPORT_SYMBOL_GPL(udp_tunnel_notify_del_rx_port);
172
173 void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
174 __be32 src, __be32 dst, __u8 tos, __u8 ttl,
175 __be16 df, __be16 src_port, __be16 dst_port,
176 bool xnet, bool nocheck)
177 {
178 struct udphdr *uh;
179
180 __skb_push(skb, sizeof(*uh));
181 skb_reset_transport_header(skb);
182 uh = udp_hdr(skb);
183
184 uh->dest = dst_port;
185 uh->source = src_port;
186 uh->len = htons(skb->len);
187
188 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
189
190 udp_set_csum(nocheck, skb, src, dst, skb->len);
191
192 iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df, xnet);
193 }
194 EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
195
196 void udp_tunnel_sock_release(struct socket *sock)
197 {
198 rcu_assign_sk_user_data(sock->sk, NULL);
199 kernel_sock_shutdown(sock, SHUT_RDWR);
200 sock_release(sock);
201 }
202 EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
203
204 struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
205 __be16 flags, __be64 tunnel_id, int md_size)
206 {
207 struct metadata_dst *tun_dst;
208 struct ip_tunnel_info *info;
209
210 if (family == AF_INET)
211 tun_dst = ip_tun_rx_dst(skb, flags, tunnel_id, md_size);
212 else
213 tun_dst = ipv6_tun_rx_dst(skb, flags, tunnel_id, md_size);
214 if (!tun_dst)
215 return NULL;
216
217 info = &tun_dst->u.tun_info;
218 info->key.tp_src = udp_hdr(skb)->source;
219 info->key.tp_dst = udp_hdr(skb)->dest;
220 if (udp_hdr(skb)->check)
221 info->key.tun_flags |= TUNNEL_CSUM;
222 return tun_dst;
223 }
224 EXPORT_SYMBOL_GPL(udp_tun_rx_dst);
225
226 MODULE_LICENSE("GPL");