[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/kernel.h>
#include <net/dst_metadata.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_rcv = cfg->encap_err_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);
	synchronize_rcu();
	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>
8024e028	5	#include <linux/kernel.h>
c29a70d2	6	#include <net/dst_metadata.h>
8024e028 TH	7	#include <net/udp.h>
8024e028 TH	8	#include <net/udp_tunnel.h>
8024e028	9
fd384412 AZ	10	int udp_sock_create4(struct net net, struct udp_port_cfg cfg,
fd384412 AZ	11	struct socket **sockp)
8024e028	12	{
6a93cc90	13	int err;
8024e028	14	struct socket *sock = NULL;
fd384412	15	struct sockaddr_in udp_addr;
8024e028	16
26abe143	17	err = sock_create_kern(net, AF_INET, SOCK_DGRAM, 0, &sock);
fd384412 AZ	18	if (err < 0)
fd384412 AZ	19	goto error;
8024e028	20
da5095d0	21	if (cfg->bind_ifindex) {
8ea204c2	22	err = sock_bindtoindex(sock->sk, cfg->bind_ifindex, true);
da5095d0 AB	23	if (err < 0)
	24	goto error;
	25	}
	26
fd384412 AZ	27	udp_addr.sin_family = AF_INET;
	28	udp_addr.sin_addr = cfg->local_ip;
	29	udp_addr.sin_port = cfg->local_udp_port;
	30	err = kernel_bind(sock, (struct sockaddr *)&udp_addr,
	31	sizeof(udp_addr));
	32	if (err < 0)
	33	goto error;
8024e028	34
fd384412	35	if (cfg->peer_udp_port) {
8024e028	36	udp_addr.sin_family = AF_INET;
fd384412 AZ	37	udp_addr.sin_addr = cfg->peer_ip;
	38	udp_addr.sin_port = cfg->peer_udp_port;
	39	err = kernel_connect(sock, (struct sockaddr *)&udp_addr,
	40	sizeof(udp_addr), 0);
8024e028 TH	41	if (err < 0)
8024e028 TH	42	goto error;
8024e028 TH	43	}
8024e028 TH	44
fd384412	45	sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
8024e028 TH	46
8024e028 TH	47	*sockp = sock;
8024e028 TH	48	return 0;
	49
	50	error:
	51	if (sock) {
	52	kernel_sock_shutdown(sock, SHUT_RDWR);
26abe143	53	sock_release(sock);
8024e028 TH	54	}
	55	*sockp = NULL;
	56	return err;
	57	}
fd384412	58	EXPORT_SYMBOL(udp_sock_create4);
8024e028	59
6a93cc90 AZ	60	void setup_udp_tunnel_sock(struct net net, struct socket sock,
	61	struct udp_tunnel_sock_cfg *cfg)
	62	{
	63	struct sock *sk = sock->sk;
	64
	65	/* Disable multicast loopback */
	66	inet_sk(sk)->mc_loop = 0;
	67
	68	/* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
224d019c	69	inet_inc_convert_csum(sk);
6a93cc90 AZ	70
	71	rcu_assign_sk_user_data(sk, cfg->sk_user_data);
	72
	73	udp_sk(sk)->encap_type = cfg->encap_type;
	74	udp_sk(sk)->encap_rcv = cfg->encap_rcv;
ac56a0b4	75	udp_sk(sk)->encap_err_rcv = cfg->encap_err_rcv;
a36e185e	76	udp_sk(sk)->encap_err_lookup = cfg->encap_err_lookup;
6a93cc90	77	udp_sk(sk)->encap_destroy = cfg->encap_destroy;
38fd2af2 TH	78	udp_sk(sk)->gro_receive = cfg->gro_receive;
38fd2af2 TH	79	udp_sk(sk)->gro_complete = cfg->gro_complete;
6a93cc90 AZ	80
	81	udp_tunnel_encap_enable(sock);
	82	}
	83	EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
	84
e7b3db5e AD	85	void udp_tunnel_push_rx_port(struct net_device dev, struct socket sock,
	86	unsigned short type)
	87	{
	88	struct sock *sk = sock->sk;
	89	struct udp_tunnel_info ti;
	90
	91	ti.type = type;
	92	ti.sa_family = sk->sk_family;
	93	ti.port = inet_sk(sk)->inet_sport;
	94
876c4384	95	udp_tunnel_nic_add_port(dev, &ti);
e7b3db5e AD	96	}
	97	EXPORT_SYMBOL_GPL(udp_tunnel_push_rx_port);
	98
296d8ee3 SD	99	void udp_tunnel_drop_rx_port(struct net_device dev, struct socket sock,
	100	unsigned short type)
	101	{
	102	struct sock *sk = sock->sk;
	103	struct udp_tunnel_info ti;
	104
296d8ee3 SD	105	ti.type = type;
	106	ti.sa_family = sk->sk_family;
	107	ti.port = inet_sk(sk)->inet_sport;
	108
876c4384	109	udp_tunnel_nic_del_port(dev, &ti);
296d8ee3 SD	110	}
	111	EXPORT_SYMBOL_GPL(udp_tunnel_drop_rx_port);
	112
e7b3db5e AD	113	/* Notify netdevs that UDP port started listening */
	114	void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type)
	115	{
	116	struct sock *sk = sock->sk;
	117	struct net *net = sock_net(sk);
	118	struct udp_tunnel_info ti;
	119	struct net_device *dev;
	120
	121	ti.type = type;
	122	ti.sa_family = sk->sk_family;
	123	ti.port = inet_sk(sk)->inet_sport;
	124
	125	rcu_read_lock();
1938ee1f	126	for_each_netdev_rcu(net, dev) {
876c4384	127	udp_tunnel_nic_add_port(dev, &ti);
1938ee1f	128	}
e7b3db5e AD	129	rcu_read_unlock();
	130	}
	131	EXPORT_SYMBOL_GPL(udp_tunnel_notify_add_rx_port);
	132
e7b3db5e AD	133	/* Notify netdevs that UDP port is no more listening */
	134	void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type)
	135	{
	136	struct sock *sk = sock->sk;
	137	struct net *net = sock_net(sk);
	138	struct udp_tunnel_info ti;
	139	struct net_device *dev;
	140
	141	ti.type = type;
	142	ti.sa_family = sk->sk_family;
	143	ti.port = inet_sk(sk)->inet_sport;
	144
	145	rcu_read_lock();
1938ee1f	146	for_each_netdev_rcu(net, dev) {
876c4384	147	udp_tunnel_nic_del_port(dev, &ti);
1938ee1f	148	}
e7b3db5e AD	149	rcu_read_unlock();
	150	}
	151	EXPORT_SYMBOL_GPL(udp_tunnel_notify_del_rx_port);
	152
039f5062 PS	153	void udp_tunnel_xmit_skb(struct rtable rt, struct sock sk, struct sk_buff *skb,
	154	__be32 src, __be32 dst, __u8 tos, __u8 ttl,
	155	__be16 df, __be16 src_port, __be16 dst_port,
	156	bool xnet, bool nocheck)
6a93cc90 AZ	157	{
	158	struct udphdr *uh;
	159
	160	__skb_push(skb, sizeof(*uh));
	161	skb_reset_transport_header(skb);
	162	uh = udp_hdr(skb);
	163
	164	uh->dest = dst_port;
	165	uh->source = src_port;
	166	uh->len = htons(skb->len);
	167
5146d1f1 BH	168	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
5146d1f1 BH	169
d998f8ef	170	udp_set_csum(nocheck, skb, src, dst, skb->len);
6a93cc90	171
039f5062	172	iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df, xnet);
6a93cc90 AZ	173	}
	174	EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
	175
	176	void udp_tunnel_sock_release(struct socket *sock)
	177	{
	178	rcu_assign_sk_user_data(sock->sk, NULL);
3cf7203c	179	synchronize_rcu();
6a93cc90	180	kernel_sock_shutdown(sock, SHUT_RDWR);
26abe143	181	sock_release(sock);
6a93cc90 AZ	182	}
	183	EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
	184
c29a70d2 PS	185	struct metadata_dst udp_tun_rx_dst(struct sk_buff skb, unsigned short family,
	186	__be16 flags, __be64 tunnel_id, int md_size)
	187	{
	188	struct metadata_dst *tun_dst;
	189	struct ip_tunnel_info *info;
	190
	191	if (family == AF_INET)
	192	tun_dst = ip_tun_rx_dst(skb, flags, tunnel_id, md_size);
	193	else
	194	tun_dst = ipv6_tun_rx_dst(skb, flags, tunnel_id, md_size);
	195	if (!tun_dst)
	196	return NULL;
	197
	198	info = &tun_dst->u.tun_info;
	199	info->key.tp_src = udp_hdr(skb)->source;
	200	info->key.tp_dst = udp_hdr(skb)->dest;
	201	if (udp_hdr(skb)->check)
	202	info->key.tun_flags \|= TUNNEL_CSUM;
	203	return tun_dst;
	204	}
	205	EXPORT_SYMBOL_GPL(udp_tun_rx_dst);
	206
8024e028	207	MODULE_LICENSE("GPL");