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net: support ns lookup

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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: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-09-12 13:52:44 +02:00
parent 74b24a582e
commit 195f742229
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 6 additions and 2 deletions
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8
net/core/net_namespace.c
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@ -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()).