net/ipv6/ip6_udp_tunnel.c

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/socket.h>
#include <linux/udp.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/in6.h>
#include <net/udp.h>
#include <net/udp_tunnel.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/ip6_tunnel.h>
#include <net/ip6_checksum.h>

int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
		     struct socket **sockp)
{
	struct sockaddr_in6 udp6_addr;
	int err;
	struct socket *sock = NULL;

	err = sock_create_kern(AF_INET6, SOCK_DGRAM, 0, &sock);
	if (err < 0)
		goto error;

	sk_change_net(sock->sk, net);

	udp6_addr.sin6_family = AF_INET6;
	memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6,
	       sizeof(udp6_addr.sin6_addr));
	udp6_addr.sin6_port = cfg->local_udp_port;
	err = kernel_bind(sock, (struct sockaddr *)&udp6_addr,
			  sizeof(udp6_addr));
	if (err < 0)
		goto error;

	if (cfg->peer_udp_port) {
		udp6_addr.sin6_family = AF_INET6;
		memcpy(&udp6_addr.sin6_addr, &cfg->peer_ip6,
		       sizeof(udp6_addr.sin6_addr));
		udp6_addr.sin6_port = cfg->peer_udp_port;
		err = kernel_connect(sock,
				     (struct sockaddr *)&udp6_addr,
				     sizeof(udp6_addr), 0);
	}
	if (err < 0)
		goto error;

	udp_set_no_check6_tx(sock->sk, !cfg->use_udp6_tx_checksums);
	udp_set_no_check6_rx(sock->sk, !cfg->use_udp6_rx_checksums);

	*sockp = sock;
	return 0;

error:
	if (sock) {
		kernel_sock_shutdown(sock, SHUT_RDWR);
		sk_release_kernel(sock->sk);
	}
	*sockp = NULL;
	return err;
}
EXPORT_SYMBOL_GPL(udp_sock_create6);