[mirror_ubuntu-artful-kernel.git] / net / ipv4 / 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 <net/udp.h>
#include <net/udp_tunnel.h>
#include <net/net_namespace.h>

int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
		     struct socket **sockp)
{
	int err;
	struct socket *sock = NULL;
	struct sockaddr_in udp_addr;

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

	udp_addr.sin_family = AF_INET;
	udp_addr.sin_addr = cfg->local_ip;
	udp_addr.sin_port = cfg->local_udp_port;
	err = kernel_bind(sock, (struct sockaddr *)&udp_addr,
			  sizeof(udp_addr));
	if (err < 0)
		goto error;

	if (cfg->peer_udp_port) {
		udp_addr.sin_family = AF_INET;
		udp_addr.sin_addr = cfg->peer_ip;
		udp_addr.sin_port = cfg->peer_udp_port;
		err = kernel_connect(sock, (struct sockaddr *)&udp_addr,
				     sizeof(udp_addr), 0);
		if (err < 0)
			goto error;
	}

	sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;

	*sockp = sock;
	return 0;

error:
	if (sock) {
		kernel_sock_shutdown(sock, SHUT_RDWR);
		sock_release(sock);
	}
	*sockp = NULL;
	return err;
}
EXPORT_SYMBOL(udp_sock_create4);

void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
			   struct udp_tunnel_sock_cfg *cfg)
{
	struct sock *sk = sock->sk;

	/* Disable multicast loopback */
	inet_sk(sk)->mc_loop = 0;

	/* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
	inet_inc_convert_csum(sk);

	rcu_assign_sk_user_data(sk, cfg->sk_user_data);

	udp_sk(sk)->encap_type = cfg->encap_type;
	udp_sk(sk)->encap_rcv = cfg->encap_rcv;
	udp_sk(sk)->encap_destroy = cfg->encap_destroy;

	udp_tunnel_encap_enable(sock);
}
EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);

int udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
			__be32 src, __be32 dst, __u8 tos, __u8 ttl,
			__be16 df, __be16 src_port, __be16 dst_port,
			bool xnet, bool nocheck)
{
	struct udphdr *uh;

	__skb_push(skb, sizeof(*uh));
	skb_reset_transport_header(skb);
	uh = udp_hdr(skb);

	uh->dest = dst_port;
	uh->source = src_port;
	uh->len = htons(skb->len);

	udp_set_csum(nocheck, skb, src, dst, skb->len);

	return iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP,
			     tos, ttl, df, xnet);
}
EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);

void udp_tunnel_sock_release(struct socket *sock)
{
	rcu_assign_sk_user_data(sock->sk, NULL);
	kernel_sock_shutdown(sock, SHUT_RDWR);
	sock_release(sock);
}
EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);

MODULE_LICENSE("GPL");
Commit	Line	Data
8024e028 TH	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/udp.h>
	8	#include <net/udp_tunnel.h>
	9	#include <net/net_namespace.h>
	10
fd384412 AZ	11	int udp_sock_create4(struct net net, struct udp_port_cfg cfg,
fd384412 AZ	12	struct socket **sockp)
8024e028	13	{
6a93cc90	14	int err;
8024e028	15	struct socket *sock = NULL;
fd384412	16	struct sockaddr_in udp_addr;
8024e028	17
26abe143	18	err = sock_create_kern(net, AF_INET, SOCK_DGRAM, 0, &sock);
fd384412 AZ	19	if (err < 0)
fd384412 AZ	20	goto error;
8024e028	21
fd384412 AZ	22	udp_addr.sin_family = AF_INET;
	23	udp_addr.sin_addr = cfg->local_ip;
	24	udp_addr.sin_port = cfg->local_udp_port;
	25	err = kernel_bind(sock, (struct sockaddr *)&udp_addr,
	26	sizeof(udp_addr));
	27	if (err < 0)
	28	goto error;
8024e028	29
fd384412	30	if (cfg->peer_udp_port) {
8024e028	31	udp_addr.sin_family = AF_INET;
fd384412 AZ	32	udp_addr.sin_addr = cfg->peer_ip;
	33	udp_addr.sin_port = cfg->peer_udp_port;
	34	err = kernel_connect(sock, (struct sockaddr *)&udp_addr,
	35	sizeof(udp_addr), 0);
8024e028 TH	36	if (err < 0)
8024e028 TH	37	goto error;
8024e028 TH	38	}
8024e028 TH	39
fd384412	40	sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
8024e028 TH	41
8024e028 TH	42	*sockp = sock;
8024e028 TH	43	return 0;
	44
	45	error:
	46	if (sock) {
	47	kernel_sock_shutdown(sock, SHUT_RDWR);
26abe143	48	sock_release(sock);
8024e028 TH	49	}
	50	*sockp = NULL;
	51	return err;
	52	}
fd384412	53	EXPORT_SYMBOL(udp_sock_create4);
8024e028	54
6a93cc90 AZ	55	void setup_udp_tunnel_sock(struct net net, struct socket sock,
	56	struct udp_tunnel_sock_cfg *cfg)
	57	{
	58	struct sock *sk = sock->sk;
	59
	60	/* Disable multicast loopback */
	61	inet_sk(sk)->mc_loop = 0;
	62
	63	/* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
224d019c	64	inet_inc_convert_csum(sk);
6a93cc90 AZ	65
	66	rcu_assign_sk_user_data(sk, cfg->sk_user_data);
	67
	68	udp_sk(sk)->encap_type = cfg->encap_type;
	69	udp_sk(sk)->encap_rcv = cfg->encap_rcv;
	70	udp_sk(sk)->encap_destroy = cfg->encap_destroy;
	71
	72	udp_tunnel_encap_enable(sock);
	73	}
	74	EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
	75
79b16aad	76	int udp_tunnel_xmit_skb(struct rtable rt, struct sock sk, struct sk_buff *skb,
d998f8ef TH	77	__be32 src, __be32 dst, __u8 tos, __u8 ttl,
	78	__be16 df, __be16 src_port, __be16 dst_port,
	79	bool xnet, bool nocheck)
6a93cc90 AZ	80	{
	81	struct udphdr *uh;
	82
	83	__skb_push(skb, sizeof(*uh));
	84	skb_reset_transport_header(skb);
	85	uh = udp_hdr(skb);
	86
	87	uh->dest = dst_port;
	88	uh->source = src_port;
	89	uh->len = htons(skb->len);
	90
d998f8ef	91	udp_set_csum(nocheck, skb, src, dst, skb->len);
6a93cc90	92
79b16aad	93	return iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP,
6a93cc90 AZ	94	tos, ttl, df, xnet);
	95	}
	96	EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
	97
	98	void udp_tunnel_sock_release(struct socket *sock)
	99	{
	100	rcu_assign_sk_user_data(sock->sk, NULL);
	101	kernel_sock_shutdown(sock, SHUT_RDWR);
26abe143	102	sock_release(sock);
6a93cc90 AZ	103	}
	104	EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
	105
8024e028	106	MODULE_LICENSE("GPL");