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