[linux-2.6-block.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(AF_INET, SOCK_DGRAM, 0, &sock);
	if (err < 0)
		goto error;

	sk_change_net(sock->sk, net);

	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);
		sk_release_kernel(sock->sk);
	}
	*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);
	sk_release_kernel(sock->sk);
}
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
fd384412 AZ	18	err = sock_create_kern(AF_INET, SOCK_DGRAM, 0, &sock);
	19	if (err < 0)
	20	goto error;
8024e028	21
fd384412	22	sk_change_net(sock->sk, net);
8024e028	23
fd384412 AZ	24	udp_addr.sin_family = AF_INET;
	25	udp_addr.sin_addr = cfg->local_ip;
	26	udp_addr.sin_port = cfg->local_udp_port;
	27	err = kernel_bind(sock, (struct sockaddr *)&udp_addr,
	28	sizeof(udp_addr));
	29	if (err < 0)
	30	goto error;
8024e028	31
fd384412	32	if (cfg->peer_udp_port) {
8024e028	33	udp_addr.sin_family = AF_INET;
fd384412 AZ	34	udp_addr.sin_addr = cfg->peer_ip;
	35	udp_addr.sin_port = cfg->peer_udp_port;
	36	err = kernel_connect(sock, (struct sockaddr *)&udp_addr,
	37	sizeof(udp_addr), 0);
8024e028 TH	38	if (err < 0)
8024e028 TH	39	goto error;
8024e028 TH	40	}
8024e028 TH	41
fd384412	42	sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
8024e028 TH	43
8024e028 TH	44	*sockp = sock;
8024e028 TH	45	return 0;
	46
	47	error:
	48	if (sock) {
	49	kernel_sock_shutdown(sock, SHUT_RDWR);
	50	sk_release_kernel(sock->sk);
	51	}
	52	*sockp = NULL;
	53	return err;
	54	}
fd384412	55	EXPORT_SYMBOL(udp_sock_create4);
8024e028	56
6a93cc90 AZ	57	void setup_udp_tunnel_sock(struct net net, struct socket sock,
	58	struct udp_tunnel_sock_cfg *cfg)
	59	{
	60	struct sock *sk = sock->sk;
	61
	62	/* Disable multicast loopback */
	63	inet_sk(sk)->mc_loop = 0;
	64
	65	/* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
224d019c	66	inet_inc_convert_csum(sk);
6a93cc90 AZ	67
	68	rcu_assign_sk_user_data(sk, cfg->sk_user_data);
	69
	70	udp_sk(sk)->encap_type = cfg->encap_type;
	71	udp_sk(sk)->encap_rcv = cfg->encap_rcv;
	72	udp_sk(sk)->encap_destroy = cfg->encap_destroy;
	73
	74	udp_tunnel_encap_enable(sock);
	75	}
	76	EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
	77
79b16aad	78	int udp_tunnel_xmit_skb(struct rtable rt, struct sock sk, struct sk_buff *skb,
d998f8ef TH	79	__be32 src, __be32 dst, __u8 tos, __u8 ttl,
	80	__be16 df, __be16 src_port, __be16 dst_port,
	81	bool xnet, bool nocheck)
6a93cc90 AZ	82	{
	83	struct udphdr *uh;
	84
	85	__skb_push(skb, sizeof(*uh));
	86	skb_reset_transport_header(skb);
	87	uh = udp_hdr(skb);
	88
	89	uh->dest = dst_port;
	90	uh->source = src_port;
	91	uh->len = htons(skb->len);
	92
d998f8ef	93	udp_set_csum(nocheck, skb, src, dst, skb->len);
6a93cc90	94
79b16aad	95	return iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP,
6a93cc90 AZ	96	tos, ttl, df, xnet);
	97	}
	98	EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
	99
	100	void udp_tunnel_sock_release(struct socket *sock)
	101	{
	102	rcu_assign_sk_user_data(sock->sk, NULL);
	103	kernel_sock_shutdown(sock, SHUT_RDWR);
	104	sk_release_kernel(sock->sk);
	105	}
	106	EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
	107
8024e028	108	MODULE_LICENSE("GPL");