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/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
#include <net/sock.h>
#include <net/netns/generic.h>
#include <net/net_namespace.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/pid_namespace.h>
#include <net/udp_tunnel.h>
#include "rxe_ns.h"
/*
* Per network namespace data
*/
struct rxe_ns_sock {
struct sock __rcu *rxe_sk4;
struct sock __rcu *rxe_sk6;
};
/*
* Index to store custom data for each network namespace.
*/
static unsigned int rxe_pernet_id;
/*
* Called for every existing and added network namespaces
*/
static int rxe_ns_init(struct net *net)
{
/* defer socket create in the namespace to the first
* device create.
*/
return 0;
}
static void rxe_ns_exit(struct net *net)
{
/* called when the network namespace is removed
*/
struct rxe_ns_sock *ns_sk = net_generic(net, rxe_pernet_id);
struct sock *sk;
rcu_read_lock();
sk = rcu_dereference(ns_sk->rxe_sk4);
rcu_read_unlock();
if (sk) {
rcu_assign_pointer(ns_sk->rxe_sk4, NULL);
udp_tunnel_sock_release(sk->sk_socket);
}
#if IS_ENABLED(CONFIG_IPV6)
rcu_read_lock();
sk = rcu_dereference(ns_sk->rxe_sk6);
rcu_read_unlock();
if (sk) {
rcu_assign_pointer(ns_sk->rxe_sk6, NULL);
udp_tunnel_sock_release(sk->sk_socket);
}
#endif
}
/*
* callback to make the module network namespace aware
*/
static struct pernet_operations rxe_net_ops = {
.init = rxe_ns_init,
.exit = rxe_ns_exit,
.id = &rxe_pernet_id,
.size = sizeof(struct rxe_ns_sock),
};
struct sock *rxe_ns_pernet_sk4(struct net *net)
{
struct rxe_ns_sock *ns_sk = net_generic(net, rxe_pernet_id);
struct sock *sk;
rcu_read_lock();
sk = rcu_dereference(ns_sk->rxe_sk4);
rcu_read_unlock();
return sk;
}
void rxe_ns_pernet_set_sk4(struct net *net, struct sock *sk)
{
struct rxe_ns_sock *ns_sk = net_generic(net, rxe_pernet_id);
rcu_assign_pointer(ns_sk->rxe_sk4, sk);
synchronize_rcu();
}
#if IS_ENABLED(CONFIG_IPV6)
struct sock *rxe_ns_pernet_sk6(struct net *net)
{
struct rxe_ns_sock *ns_sk = net_generic(net, rxe_pernet_id);
struct sock *sk;
rcu_read_lock();
sk = rcu_dereference(ns_sk->rxe_sk6);
rcu_read_unlock();
return sk;
}
void rxe_ns_pernet_set_sk6(struct net *net, struct sock *sk)
{
struct rxe_ns_sock *ns_sk = net_generic(net, rxe_pernet_id);
rcu_assign_pointer(ns_sk->rxe_sk6, sk);
synchronize_rcu();
}
#endif /* IPV6 */
int rxe_namespace_init(void)
{
return register_pernet_subsys(&rxe_net_ops);
}
void rxe_namespace_exit(void)
{
unregister_pernet_subsys(&rxe_net_ops);
}
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