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Commit 02d793c5 authored by WANG Cong's avatar WANG Cong Committed by David S. Miller
Browse files

fou: add network namespace support 



Also convert the spinlock to a mutex.

Cc: Tom Herbert <tom@herbertland.com>
Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4cbcdf2b

net/ipv4/fou.c

+67 −39
Original line number Diff line number Diff line
@@ -16,9 +16,6 @@ 
#include <uapi/linux/fou.h>

#include <uapi/linux/genetlink.h>



static DEFINE_SPINLOCK(fou_lock);

static LIST_HEAD(fou_list);



struct fou {

	struct socket *sock;

	u8 protocol;
@@ -37,6 +34,13 @@ struct fou_cfg { 
	struct udp_port_cfg udp_config;

};



static unsigned int fou_net_id;



struct fou_net {

	struct list_head fou_list;

	struct mutex fou_lock;

};



static inline struct fou *fou_from_sock(struct sock *sk)

{

	return sk->sk_user_data;
@@ -387,20 +391,21 @@ out_unlock: 
	return err;

}



static int fou_add_to_port_list(struct fou *fou)

static int fou_add_to_port_list(struct net *net, struct fou *fou)

{

	struct fou_net *fn = net_generic(net, fou_net_id);

	struct fou *fout;



	spin_lock(&fou_lock);

	list_for_each_entry(fout, &fou_list, list) {

	mutex_lock(&fn->fou_lock);

	list_for_each_entry(fout, &fn->fou_list, list) {

		if (fou->port == fout->port) {

			spin_unlock(&fou_lock);

			mutex_unlock(&fn->fou_lock);

			return -EALREADY;

		}

	}



	list_add(&fou->list, &fou_list);

	spin_unlock(&fou_lock);

	list_add(&fou->list, &fn->fou_list);

	mutex_unlock(&fn->fou_lock);



	return 0;

}
@@ -412,13 +417,8 @@ static void fou_release(struct fou *fou) 


	if (sk->sk_family == AF_INET)

		udp_del_offload(&fou->udp_offloads);



	list_del(&fou->list);



	/* Remove hooks into tunnel socket */

	sk->sk_user_data = NULL;



	sock_release(sock);

	udp_tunnel_sock_release(sock);



	kfree(fou);

}
@@ -448,10 +448,10 @@ static int gue_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg) 
static int fou_create(struct net *net, struct fou_cfg *cfg,

		      struct socket **sockp)

{

	struct fou *fou = NULL;

	int err;

	struct socket *sock = NULL;

	struct fou *fou = NULL;

	struct sock *sk;

	int err;



	/* Open UDP socket */

	err = udp_sock_create(net, &cfg->udp_config, &sock);
@@ -503,7 +503,7 @@ static int fou_create(struct net *net, struct fou_cfg *cfg, 
			goto error;

	}



	err = fou_add_to_port_list(fou);

	err = fou_add_to_port_list(net, fou);

	if (err)

		goto error;
@@ -515,26 +515,27 @@ static int fou_create(struct net *net, struct fou_cfg *cfg, 
error:

	kfree(fou);

	if (sock)

		sock_release(sock);

		udp_tunnel_sock_release(sock);



	return err;

}



static int fou_destroy(struct net *net, struct fou_cfg *cfg)

{

	struct fou *fou;

	struct fou_net *fn = net_generic(net, fou_net_id);

	__be16 port = cfg->udp_config.local_udp_port;

	int err = -EINVAL;

	struct fou *fou;



	spin_lock(&fou_lock);

	list_for_each_entry(fou, &fou_list, list) {

	mutex_lock(&fn->fou_lock);

	list_for_each_entry(fou, &fn->fou_list, list) {

		if (fou->port == port) {

			fou_release(fou);

			err = 0;

			break;

		}

	}

	spin_unlock(&fou_lock);

	mutex_unlock(&fn->fou_lock);



	return err;

}
@@ -592,6 +593,7 @@ static int parse_nl_config(struct genl_info *info, 


static int fou_nl_cmd_add_port(struct sk_buff *skb, struct genl_info *info)

{

	struct net *net = genl_info_net(info);

	struct fou_cfg cfg;

	int err;
@@ -599,11 +601,12 @@ static int fou_nl_cmd_add_port(struct sk_buff *skb, struct genl_info *info) 
	if (err)

		return err;



	return fou_create(&init_net, &cfg, NULL);

	return fou_create(net, &cfg, NULL);

}



static int fou_nl_cmd_rm_port(struct sk_buff *skb, struct genl_info *info)

{

	struct net *net = genl_info_net(info);

	struct fou_cfg cfg;

	int err;
@@ -611,7 +614,7 @@ static int fou_nl_cmd_rm_port(struct sk_buff *skb, struct genl_info *info) 
	if (err)

		return err;



	return fou_destroy(&init_net, &cfg);

	return fou_destroy(net, &cfg);

}



static const struct genl_ops fou_nl_ops[] = {
@@ -823,38 +826,63 @@ static void ip_tunnel_encap_del_fou_ops(void) 


#endif



static __net_init int fou_init_net(struct net *net)

{

	struct fou_net *fn = net_generic(net, fou_net_id);



	INIT_LIST_HEAD(&fn->fou_list);

	mutex_init(&fn->fou_lock);

	return 0;

}



static __net_exit void fou_exit_net(struct net *net)

{

	struct fou_net *fn = net_generic(net, fou_net_id);

	struct fou *fou, *next;



	/* Close all the FOU sockets */

	mutex_lock(&fn->fou_lock);

	list_for_each_entry_safe(fou, next, &fn->fou_list, list)

		fou_release(fou);

	mutex_unlock(&fn->fou_lock);

}



static struct pernet_operations fou_net_ops = {

	.init = fou_init_net,

	.exit = fou_exit_net,

	.id   = &fou_net_id,

	.size = sizeof(struct fou_net),

};



static int __init fou_init(void)

{

	int ret;



	ret = register_pernet_device(&fou_net_ops);

	if (ret)

		goto exit;



	ret = genl_register_family_with_ops(&fou_nl_family,

					    fou_nl_ops);



	if (ret < 0)

		goto exit;

		goto unregister;



	ret = ip_tunnel_encap_add_fou_ops();

	if (ret < 0)

		genl_unregister_family(&fou_nl_family);

	if (ret == 0)

		return 0;



	genl_unregister_family(&fou_nl_family);

unregister:

	unregister_pernet_device(&fou_net_ops);

exit:

	return ret;

}



static void __exit fou_fini(void)

{

	struct fou *fou, *next;



	ip_tunnel_encap_del_fou_ops();



	genl_unregister_family(&fou_nl_family);



	/* Close all the FOU sockets */



	spin_lock(&fou_lock);

	list_for_each_entry_safe(fou, next, &fou_list, list)

		fou_release(fou);

	spin_unlock(&fou_lock);

	unregister_pernet_device(&fou_net_ops);

}



module_init(fou_init);