[linux.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/dst_metadata.h>
#include <net/net_namespace.h>
#include <net/udp.h>
#include <net/udp_tunnel.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);

void 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);

	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);

struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb,  unsigned short family,
				    __be16 flags, __be64 tunnel_id, int md_size)
{
	struct metadata_dst *tun_dst;
	struct ip_tunnel_info *info;

	if (family == AF_INET)
		tun_dst = ip_tun_rx_dst(skb, flags, tunnel_id, md_size);
	else
		tun_dst = ipv6_tun_rx_dst(skb, flags, tunnel_id, md_size);
	if (!tun_dst)
		return NULL;

	info = &tun_dst->u.tun_info;
	info->key.tp_src = udp_hdr(skb)->source;
	info->key.tp_dst = udp_hdr(skb)->dest;
	if (udp_hdr(skb)->check)
		info->key.tun_flags |= TUNNEL_CSUM;
	return tun_dst;
}
EXPORT_SYMBOL_GPL(udp_tun_rx_dst);

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>
c29a70d2 PS	7	#include <net/dst_metadata.h>
c29a70d2 PS	8	#include <net/net_namespace.h>
8024e028 TH	9	#include <net/udp.h>
8024e028 TH	10	#include <net/udp_tunnel.h>
8024e028	11
fd384412 AZ	12	int udp_sock_create4(struct net net, struct udp_port_cfg cfg,
fd384412 AZ	13	struct socket **sockp)
8024e028	14	{
6a93cc90	15	int err;
8024e028	16	struct socket *sock = NULL;
fd384412	17	struct sockaddr_in udp_addr;
8024e028	18
26abe143	19	err = sock_create_kern(net, AF_INET, SOCK_DGRAM, 0, &sock);
fd384412 AZ	20	if (err < 0)
fd384412 AZ	21	goto error;
8024e028	22
fd384412 AZ	23	udp_addr.sin_family = AF_INET;
	24	udp_addr.sin_addr = cfg->local_ip;
	25	udp_addr.sin_port = cfg->local_udp_port;
	26	err = kernel_bind(sock, (struct sockaddr *)&udp_addr,
	27	sizeof(udp_addr));
	28	if (err < 0)
	29	goto error;
8024e028	30
fd384412	31	if (cfg->peer_udp_port) {
8024e028	32	udp_addr.sin_family = AF_INET;
fd384412 AZ	33	udp_addr.sin_addr = cfg->peer_ip;
	34	udp_addr.sin_port = cfg->peer_udp_port;
	35	err = kernel_connect(sock, (struct sockaddr *)&udp_addr,
	36	sizeof(udp_addr), 0);
8024e028 TH	37	if (err < 0)
8024e028 TH	38	goto error;
8024e028 TH	39	}
8024e028 TH	40
fd384412	41	sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
8024e028 TH	42
8024e028 TH	43	*sockp = sock;
8024e028 TH	44	return 0;
	45
	46	error:
	47	if (sock) {
	48	kernel_sock_shutdown(sock, SHUT_RDWR);
26abe143	49	sock_release(sock);
8024e028 TH	50	}
	51	*sockp = NULL;
	52	return err;
	53	}
fd384412	54	EXPORT_SYMBOL(udp_sock_create4);
8024e028	55
6a93cc90 AZ	56	void setup_udp_tunnel_sock(struct net net, struct socket sock,
	57	struct udp_tunnel_sock_cfg *cfg)
	58	{
	59	struct sock *sk = sock->sk;
	60
	61	/* Disable multicast loopback */
	62	inet_sk(sk)->mc_loop = 0;
	63
	64	/* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
224d019c	65	inet_inc_convert_csum(sk);
6a93cc90 AZ	66
	67	rcu_assign_sk_user_data(sk, cfg->sk_user_data);
	68
	69	udp_sk(sk)->encap_type = cfg->encap_type;
	70	udp_sk(sk)->encap_rcv = cfg->encap_rcv;
	71	udp_sk(sk)->encap_destroy = cfg->encap_destroy;
	72
	73	udp_tunnel_encap_enable(sock);
	74	}
	75	EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
	76
039f5062 PS	77	void udp_tunnel_xmit_skb(struct rtable rt, struct sock sk, struct sk_buff *skb,
	78	__be32 src, __be32 dst, __u8 tos, __u8 ttl,
	79	__be16 df, __be16 src_port, __be16 dst_port,
	80	bool xnet, bool nocheck)
6a93cc90 AZ	81	{
	82	struct udphdr *uh;
	83
	84	__skb_push(skb, sizeof(*uh));
	85	skb_reset_transport_header(skb);
	86	uh = udp_hdr(skb);
	87
	88	uh->dest = dst_port;
	89	uh->source = src_port;
	90	uh->len = htons(skb->len);
	91
d998f8ef	92	udp_set_csum(nocheck, skb, src, dst, skb->len);
6a93cc90	93
039f5062	94	iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df, xnet);
6a93cc90 AZ	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
c29a70d2 PS	106	struct metadata_dst udp_tun_rx_dst(struct sk_buff skb, unsigned short family,
	107	__be16 flags, __be64 tunnel_id, int md_size)
	108	{
	109	struct metadata_dst *tun_dst;
	110	struct ip_tunnel_info *info;
	111
	112	if (family == AF_INET)
	113	tun_dst = ip_tun_rx_dst(skb, flags, tunnel_id, md_size);
	114	else
	115	tun_dst = ipv6_tun_rx_dst(skb, flags, tunnel_id, md_size);
	116	if (!tun_dst)
	117	return NULL;
	118
	119	info = &tun_dst->u.tun_info;
	120	info->key.tp_src = udp_hdr(skb)->source;
	121	info->key.tp_dst = udp_hdr(skb)->dest;
	122	if (udp_hdr(skb)->check)
	123	info->key.tun_flags \|= TUNNEL_CSUM;
	124	return tun_dst;
	125	}
	126	EXPORT_SYMBOL_GPL(udp_tun_rx_dst);
	127
8024e028	128	MODULE_LICENSE("GPL");