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 <linux/in6.h>
9#include <net/udp.h>
10#include <net/udp_tunnel.h>
11#include <net/net_namespace.h>
12#include <net/netns/generic.h>
13#include <net/ip6_tunnel.h>
14#include <net/ip6_checksum.h>
15
16int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
17 struct socket **sockp)
18{
19 struct sockaddr_in6 udp6_addr = {};
20 int err;
21 struct socket *sock = NULL;
22
23 err = sock_create_kern(net, AF_INET6, SOCK_DGRAM, 0, &sock);
24 if (err < 0)
25 goto error;
26
27 if (cfg->ipv6_v6only) {
28 int val = 1;
29
30 err = kernel_setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
31 (char *) &val, sizeof(val));
32 if (err < 0)
33 goto error;
34 }
35 if (cfg->bind_ifindex) {
36 err = kernel_setsockopt(sock, SOL_SOCKET, SO_BINDTOIFINDEX,
37 (void *)&cfg->bind_ifindex,
38 sizeof(cfg->bind_ifindex));
39 if (err < 0)
40 goto error;
41 }
42
43 udp6_addr.sin6_family = AF_INET6;
44 memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6,
45 sizeof(udp6_addr.sin6_addr));
46 udp6_addr.sin6_port = cfg->local_udp_port;
47 err = kernel_bind(sock, (struct sockaddr *)&udp6_addr,
48 sizeof(udp6_addr));
49 if (err < 0)
50 goto error;
51
52 if (cfg->peer_udp_port) {
53 memset(&udp6_addr, 0, sizeof(udp6_addr));
54 udp6_addr.sin6_family = AF_INET6;
55 memcpy(&udp6_addr.sin6_addr, &cfg->peer_ip6,
56 sizeof(udp6_addr.sin6_addr));
57 udp6_addr.sin6_port = cfg->peer_udp_port;
58 err = kernel_connect(sock,
59 (struct sockaddr *)&udp6_addr,
60 sizeof(udp6_addr), 0);
61 }
62 if (err < 0)
63 goto error;
64
65 udp_set_no_check6_tx(sock->sk, !cfg->use_udp6_tx_checksums);
66 udp_set_no_check6_rx(sock->sk, !cfg->use_udp6_rx_checksums);
67
68 *sockp = sock;
69 return 0;
70
71error:
72 if (sock) {
73 kernel_sock_shutdown(sock, SHUT_RDWR);
74 sock_release(sock);
75 }
76 *sockp = NULL;
77 return err;
78}
79EXPORT_SYMBOL_GPL(udp_sock_create6);
80
81int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
82 struct sk_buff *skb,
83 struct net_device *dev, struct in6_addr *saddr,
84 struct in6_addr *daddr,
85 __u8 prio, __u8 ttl, __be32 label,
86 __be16 src_port, __be16 dst_port, bool nocheck)
87{
88 struct udphdr *uh;
89 struct ipv6hdr *ip6h;
90
91 __skb_push(skb, sizeof(*uh));
92 skb_reset_transport_header(skb);
93 uh = udp_hdr(skb);
94
95 uh->dest = dst_port;
96 uh->source = src_port;
97
98 uh->len = htons(skb->len);
99
100 skb_dst_set(skb, dst);
101
102 udp6_set_csum(nocheck, skb, saddr, daddr, skb->len);
103
104 __skb_push(skb, sizeof(*ip6h));
105 skb_reset_network_header(skb);
106 ip6h = ipv6_hdr(skb);
107 ip6_flow_hdr(ip6h, prio, label);
108 ip6h->payload_len = htons(skb->len);
109 ip6h->nexthdr = IPPROTO_UDP;
110 ip6h->hop_limit = ttl;
111 ip6h->daddr = *daddr;
112 ip6h->saddr = *saddr;
113
114 ip6tunnel_xmit(sk, skb, dev);
115 return 0;
116}
117EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb);
118
119MODULE_LICENSE("GPL");
120
