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netfilter: nfnetlink: add netns refcount tracker to struct nfulnl_instance

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If compiled with CONFIG_NET_NS_REFCNT_TRACKER=y,
using put_net_track() in nfulnl_instance_free_rcu()
and get_net_track() in instance_create()
might help us finding netns refcount imbalances.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Eric Dumazet 2021-12-13 08:39:59 -08:00 committed by Pablo Neira Ayuso
parent 604ba23090
commit a9382d9389
1 changed files with 3 additions and 2 deletions
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5
net/netfilter/nfnetlink_log.c
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@ -66,6 +66,7 @@ struct nfulnl_instance {
struct sk_buff *skb; /* pre-allocatd skb */
struct timer_list timer;
struct net *net;
netns_tracker ns_tracker;
struct user_namespace *peer_user_ns; /* User namespace of the peer process */
u32 peer_portid; /* PORTID of the peer process */
@ -140,7 +141,7 @@ static void nfulnl_instance_free_rcu(struct rcu_head *head)
struct nfulnl_instance *inst =
container_of(head, struct nfulnl_instance, rcu);
put_net(inst->net);
put_net_track(inst->net, &inst->ns_tracker);
kfree(inst);
module_put(THIS_MODULE);
}
@ -187,7 +188,7 @@ instance_create(struct net *net, u_int16_t group_num,
timer_setup(&inst->timer, nfulnl_timer, 0);
inst->net = get_net(net);
inst->net = get_net_track(net, &inst->ns_tracker, GFP_ATOMIC);
inst->peer_user_ns = user_ns;
inst->peer_portid = portid;
inst->group_num = group_num;