Unverified Commit 195f7422 authored by Christian Brauner's avatar Christian Brauner
Browse files

net: support ns lookup 



Support the generic ns lookup infrastructure to support file handles for
namespaces.

The network namespace has a separate list with different lifetime rules
which we can just leave in tact. We have a similar concept for mount
namespaces as well where it is on two differenet lists for different
purposes.

Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent 74b24a58

net/core/net_namespace.c

+6 −2
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#include <linux/sched/task.h>

#include <linux/uidgid.h>

#include <linux/proc_fs.h>

#include <linux/nstree.h>



#include <net/aligned_data.h>

#include <net/sock.h>
@@ -445,7 +446,7 @@ static __net_init int setup_net(struct net *net) 
	LIST_HEAD(net_exit_list);

	int error = 0;



	net->net_cookie = atomic64_inc_return(&net_aligned_data.net_cookie);

	net->net_cookie = ns_tree_gen_id(&net->ns);



	list_for_each_entry(ops, &pernet_list, list) {

		error = ops_init(ops, net);
@@ -455,6 +456,7 @@ static __net_init int setup_net(struct net *net) 
	down_write(&net_rwsem);

	list_add_tail_rcu(&net->list, &net_namespace_list);

	up_write(&net_rwsem);

	ns_tree_add_raw(net);

out:

	return error;
@@ -674,8 +676,10 @@ static void cleanup_net(struct work_struct *work) 


	/* Don't let anyone else find us. */

	down_write(&net_rwsem);

	llist_for_each_entry(net, net_kill_list, cleanup_list)

	llist_for_each_entry(net, net_kill_list, cleanup_list) {

		ns_tree_remove(net);

		list_del_rcu(&net->list);

	}

	/* Cache last net. After we unlock rtnl, no one new net

	 * added to net_namespace_list can assign nsid pointer

	 * to a net from net_kill_list (see peernet2id_alloc()).