tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <linux/module.h>
2#include <linux/errno.h>
3#include <linux/socket.h>
4#include <linux/udp.h>
5#include <linux/types.h>
6#include <linux/kernel.h>
7#include <net/dst_metadata.h>
8#include <net/net_namespace.h>
9#include <net/udp.h>
10#include <net/udp_tunnel.h>
11
12int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
13 struct socket **sockp)
14{
15 int err;
16 struct socket *sock = NULL;
17 struct sockaddr_in udp_addr;
18
19 err = sock_create_kern(net, AF_INET, SOCK_DGRAM, 0, &sock);
20 if (err < 0)
21 goto error;
22
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,
27 sizeof(udp_addr));
28 if (err < 0)
29 goto error;
30
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,
36 sizeof(udp_addr), 0);
37 if (err < 0)
38 goto error;
39 }
40
41 sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
42
43 *sockp = sock;
44 return 0;
45
46error:
47 if (sock) {
48 kernel_sock_shutdown(sock, SHUT_RDWR);
49 sock_release(sock);
50 }
51 *sockp = NULL;
52 return err;
53}
54EXPORT_SYMBOL(udp_sock_create4);
55
56void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
57 struct udp_tunnel_sock_cfg *cfg)
58{
59 struct sock *sk = sock->sk;
60
61 /* Disable multicast loopback */
62 inet_sk(sk)->mc_loop = 0;
63
64 /* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
65 inet_inc_convert_csum(sk);
66
67 rcu_assign_sk_user_data(sk, cfg->sk_user_data);
68
69 udp_sk(sk)->encap_type = cfg->encap_type;
70 udp_sk(sk)->encap_rcv = cfg->encap_rcv;
71 udp_sk(sk)->encap_destroy = cfg->encap_destroy;
72
73 udp_tunnel_encap_enable(sock);
74}
75EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
76
77int udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
78 __be32 src, __be32 dst, __u8 tos, __u8 ttl,
79 __be16 df, __be16 src_port, __be16 dst_port,
80 bool xnet, bool nocheck)
81{
82 struct udphdr *uh;
83
84 __skb_push(skb, sizeof(*uh));
85 skb_reset_transport_header(skb);
86 uh = udp_hdr(skb);
87
88 uh->dest = dst_port;
89 uh->source = src_port;
90 uh->len = htons(skb->len);
91
92 udp_set_csum(nocheck, skb, src, dst, skb->len);
93
94 return iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP,
95 tos, ttl, df, xnet);
96}
97EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
98
99void udp_tunnel_sock_release(struct socket *sock)
100{
101 rcu_assign_sk_user_data(sock->sk, NULL);
102 kernel_sock_shutdown(sock, SHUT_RDWR);
103 sock_release(sock);
104}
105EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
106
107struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
108 __be16 flags, __be64 tunnel_id, int md_size)
109{
110 struct metadata_dst *tun_dst;
111 struct ip_tunnel_info *info;
112
113 if (family == AF_INET)
114 tun_dst = ip_tun_rx_dst(skb, flags, tunnel_id, md_size);
115 else
116 tun_dst = ipv6_tun_rx_dst(skb, flags, tunnel_id, md_size);
117 if (!tun_dst)
118 return NULL;
119
120 info = &tun_dst->u.tun_info;
121 info->key.tp_src = udp_hdr(skb)->source;
122 info->key.tp_dst = udp_hdr(skb)->dest;
123 if (udp_hdr(skb)->check)
124 info->key.tun_flags |= TUNNEL_CSUM;
125 return tun_dst;
126}
127EXPORT_SYMBOL_GPL(udp_tun_rx_dst);
128
129MODULE_LICENSE("GPL");