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