[linux-block.git] / net / ipv4 / udp_tunnel_core.c

// SPDX-License-Identifier: GPL-2.0-only
#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;

	if (cfg->bind_ifindex) {
		err = sock_bindtoindex(sock->sk, cfg->bind_ifindex, true);
		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_err_lookup = cfg->encap_err_lookup;
	udp_sk(sk)->encap_destroy = cfg->encap_destroy;
	udp_sk(sk)->gro_receive = cfg->gro_receive;
	udp_sk(sk)->gro_complete = cfg->gro_complete;

	udp_tunnel_encap_enable(sock);
}
EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);

void udp_tunnel_push_rx_port(struct net_device *dev, struct socket *sock,
			     unsigned short type)
{
	struct sock *sk = sock->sk;
	struct udp_tunnel_info ti;

	ti.type = type;
	ti.sa_family = sk->sk_family;
	ti.port = inet_sk(sk)->inet_sport;

	udp_tunnel_nic_add_port(dev, &ti);
}
EXPORT_SYMBOL_GPL(udp_tunnel_push_rx_port);

void udp_tunnel_drop_rx_port(struct net_device *dev, struct socket *sock,
			     unsigned short type)
{
	struct sock *sk = sock->sk;
	struct udp_tunnel_info ti;

	ti.type = type;
	ti.sa_family = sk->sk_family;
	ti.port = inet_sk(sk)->inet_sport;

	udp_tunnel_nic_del_port(dev, &ti);
}
EXPORT_SYMBOL_GPL(udp_tunnel_drop_rx_port);

/* Notify netdevs that UDP port started listening */
void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type)
{
	struct sock *sk = sock->sk;
	struct net *net = sock_net(sk);
	struct udp_tunnel_info ti;
	struct net_device *dev;

	ti.type = type;
	ti.sa_family = sk->sk_family;
	ti.port = inet_sk(sk)->inet_sport;

	rcu_read_lock();
	for_each_netdev_rcu(net, dev) {
		udp_tunnel_nic_add_port(dev, &ti);
	}
	rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(udp_tunnel_notify_add_rx_port);

/* Notify netdevs that UDP port is no more listening */
void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type)
{
	struct sock *sk = sock->sk;
	struct net *net = sock_net(sk);
	struct udp_tunnel_info ti;
	struct net_device *dev;

	ti.type = type;
	ti.sa_family = sk->sk_family;
	ti.port = inet_sk(sk)->inet_sport;

	rcu_read_lock();
	for_each_netdev_rcu(net, dev) {
		udp_tunnel_nic_del_port(dev, &ti);
	}
	rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(udp_tunnel_notify_del_rx_port);

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);

	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));

	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
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
8024e028 TH	2	#include <linux/module.h>
	3	#include <linux/errno.h>
	4	#include <linux/socket.h>
	5	#include <linux/udp.h>
	6	#include <linux/types.h>
	7	#include <linux/kernel.h>
c29a70d2 PS	8	#include <net/dst_metadata.h>
c29a70d2 PS	9	#include <net/net_namespace.h>
8024e028 TH	10	#include <net/udp.h>
8024e028 TH	11	#include <net/udp_tunnel.h>
8024e028	12
fd384412 AZ	13	int udp_sock_create4(struct net net, struct udp_port_cfg cfg,
fd384412 AZ	14	struct socket **sockp)
8024e028	15	{
6a93cc90	16	int err;
8024e028	17	struct socket *sock = NULL;
fd384412	18	struct sockaddr_in udp_addr;
8024e028	19
26abe143	20	err = sock_create_kern(net, AF_INET, SOCK_DGRAM, 0, &sock);
fd384412 AZ	21	if (err < 0)
fd384412 AZ	22	goto error;
8024e028	23
da5095d0	24	if (cfg->bind_ifindex) {
8ea204c2	25	err = sock_bindtoindex(sock->sk, cfg->bind_ifindex, true);
da5095d0 AB	26	if (err < 0)
	27	goto error;
	28	}
	29
fd384412 AZ	30	udp_addr.sin_family = AF_INET;
	31	udp_addr.sin_addr = cfg->local_ip;
	32	udp_addr.sin_port = cfg->local_udp_port;
	33	err = kernel_bind(sock, (struct sockaddr *)&udp_addr,
	34	sizeof(udp_addr));
	35	if (err < 0)
	36	goto error;
8024e028	37
fd384412	38	if (cfg->peer_udp_port) {
8024e028	39	udp_addr.sin_family = AF_INET;
fd384412 AZ	40	udp_addr.sin_addr = cfg->peer_ip;
	41	udp_addr.sin_port = cfg->peer_udp_port;
	42	err = kernel_connect(sock, (struct sockaddr *)&udp_addr,
	43	sizeof(udp_addr), 0);
8024e028 TH	44	if (err < 0)
8024e028 TH	45	goto error;
8024e028 TH	46	}
8024e028 TH	47
fd384412	48	sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
8024e028 TH	49
8024e028 TH	50	*sockp = sock;
8024e028 TH	51	return 0;
	52
	53	error:
	54	if (sock) {
	55	kernel_sock_shutdown(sock, SHUT_RDWR);
26abe143	56	sock_release(sock);
8024e028 TH	57	}
	58	*sockp = NULL;
	59	return err;
	60	}
fd384412	61	EXPORT_SYMBOL(udp_sock_create4);
8024e028	62
6a93cc90 AZ	63	void setup_udp_tunnel_sock(struct net net, struct socket sock,
	64	struct udp_tunnel_sock_cfg *cfg)
	65	{
	66	struct sock *sk = sock->sk;
	67
	68	/* Disable multicast loopback */
	69	inet_sk(sk)->mc_loop = 0;
	70
	71	/* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
224d019c	72	inet_inc_convert_csum(sk);
6a93cc90 AZ	73
	74	rcu_assign_sk_user_data(sk, cfg->sk_user_data);
	75
	76	udp_sk(sk)->encap_type = cfg->encap_type;
	77	udp_sk(sk)->encap_rcv = cfg->encap_rcv;
a36e185e	78	udp_sk(sk)->encap_err_lookup = cfg->encap_err_lookup;
6a93cc90	79	udp_sk(sk)->encap_destroy = cfg->encap_destroy;
38fd2af2 TH	80	udp_sk(sk)->gro_receive = cfg->gro_receive;
38fd2af2 TH	81	udp_sk(sk)->gro_complete = cfg->gro_complete;
6a93cc90 AZ	82
	83	udp_tunnel_encap_enable(sock);
	84	}
	85	EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
	86
e7b3db5e AD	87	void udp_tunnel_push_rx_port(struct net_device dev, struct socket sock,
	88	unsigned short type)
	89	{
	90	struct sock *sk = sock->sk;
	91	struct udp_tunnel_info ti;
	92
	93	ti.type = type;
	94	ti.sa_family = sk->sk_family;
	95	ti.port = inet_sk(sk)->inet_sport;
	96
876c4384	97	udp_tunnel_nic_add_port(dev, &ti);
e7b3db5e AD	98	}
	99	EXPORT_SYMBOL_GPL(udp_tunnel_push_rx_port);
	100
296d8ee3 SD	101	void udp_tunnel_drop_rx_port(struct net_device dev, struct socket sock,
	102	unsigned short type)
	103	{
	104	struct sock *sk = sock->sk;
	105	struct udp_tunnel_info ti;
	106
296d8ee3 SD	107	ti.type = type;
	108	ti.sa_family = sk->sk_family;
	109	ti.port = inet_sk(sk)->inet_sport;
	110
876c4384	111	udp_tunnel_nic_del_port(dev, &ti);
296d8ee3 SD	112	}
	113	EXPORT_SYMBOL_GPL(udp_tunnel_drop_rx_port);
	114
e7b3db5e AD	115	/* Notify netdevs that UDP port started listening */
	116	void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type)
	117	{
	118	struct sock *sk = sock->sk;
	119	struct net *net = sock_net(sk);
	120	struct udp_tunnel_info ti;
	121	struct net_device *dev;
	122
	123	ti.type = type;
	124	ti.sa_family = sk->sk_family;
	125	ti.port = inet_sk(sk)->inet_sport;
	126
	127	rcu_read_lock();
1938ee1f	128	for_each_netdev_rcu(net, dev) {
876c4384	129	udp_tunnel_nic_add_port(dev, &ti);
1938ee1f	130	}
e7b3db5e AD	131	rcu_read_unlock();
	132	}
	133	EXPORT_SYMBOL_GPL(udp_tunnel_notify_add_rx_port);
	134
e7b3db5e AD	135	/* Notify netdevs that UDP port is no more listening */
	136	void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type)
	137	{
	138	struct sock *sk = sock->sk;
	139	struct net *net = sock_net(sk);
	140	struct udp_tunnel_info ti;
	141	struct net_device *dev;
	142
	143	ti.type = type;
	144	ti.sa_family = sk->sk_family;
	145	ti.port = inet_sk(sk)->inet_sport;
	146
	147	rcu_read_lock();
1938ee1f	148	for_each_netdev_rcu(net, dev) {
876c4384	149	udp_tunnel_nic_del_port(dev, &ti);
1938ee1f	150	}
e7b3db5e AD	151	rcu_read_unlock();
	152	}
	153	EXPORT_SYMBOL_GPL(udp_tunnel_notify_del_rx_port);
	154
039f5062 PS	155	void udp_tunnel_xmit_skb(struct rtable rt, struct sock sk, struct sk_buff *skb,
	156	__be32 src, __be32 dst, __u8 tos, __u8 ttl,
	157	__be16 df, __be16 src_port, __be16 dst_port,
	158	bool xnet, bool nocheck)
6a93cc90 AZ	159	{
	160	struct udphdr *uh;
	161
	162	__skb_push(skb, sizeof(*uh));
	163	skb_reset_transport_header(skb);
	164	uh = udp_hdr(skb);
	165
	166	uh->dest = dst_port;
	167	uh->source = src_port;
	168	uh->len = htons(skb->len);
	169
5146d1f1 BH	170	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
5146d1f1 BH	171
d998f8ef	172	udp_set_csum(nocheck, skb, src, dst, skb->len);
6a93cc90	173
039f5062	174	iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df, xnet);
6a93cc90 AZ	175	}
	176	EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
	177
	178	void udp_tunnel_sock_release(struct socket *sock)
	179	{
	180	rcu_assign_sk_user_data(sock->sk, NULL);
	181	kernel_sock_shutdown(sock, SHUT_RDWR);
26abe143	182	sock_release(sock);
6a93cc90 AZ	183	}
	184	EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
	185
c29a70d2 PS	186	struct metadata_dst udp_tun_rx_dst(struct sk_buff skb, unsigned short family,
	187	__be16 flags, __be64 tunnel_id, int md_size)
	188	{
	189	struct metadata_dst *tun_dst;
	190	struct ip_tunnel_info *info;
	191
	192	if (family == AF_INET)
	193	tun_dst = ip_tun_rx_dst(skb, flags, tunnel_id, md_size);
	194	else
	195	tun_dst = ipv6_tun_rx_dst(skb, flags, tunnel_id, md_size);
	196	if (!tun_dst)
	197	return NULL;
	198
	199	info = &tun_dst->u.tun_info;
	200	info->key.tp_src = udp_hdr(skb)->source;
	201	info->key.tp_dst = udp_hdr(skb)->dest;
	202	if (udp_hdr(skb)->check)
	203	info->key.tun_flags \|= TUNNEL_CSUM;
	204	return tun_dst;
	205	}
	206	EXPORT_SYMBOL_GPL(udp_tun_rx_dst);
	207
8024e028	208	MODULE_LICENSE("GPL");