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sit: add net device refcount tracking to ip_tunnel

Browse source 
Note that other ip_tunnel users do not seem to hold a reference
on tunnel->dev. Probably needs some investigations.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2021-12-04 20:22:05 -08:00 committed by Jakub Kicinski
parent fb67510ba9
commit c0fd407a06
2 changed files with 5 additions and 2 deletions
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3
include/net/ip_tunnels.h
View file

@ -104,7 +104,10 @@ struct metadata_dst;
struct ip_tunnel {
struct ip_tunnel __rcu *next;
struct hlist_node hash_node;
struct net_device *dev;
netdevice_tracker dev_tracker;
struct net *net; /* netns for packet i/o */
unsigned long err_time; /* Time when the last ICMP error

4
net/ipv6/sit.c
View file

@ -521,7 +521,7 @@ static void ipip6_tunnel_uninit(struct net_device *dev)
ipip6_tunnel_del_prl(tunnel, NULL);
}
dst_cache_reset(&tunnel->dst_cache);
dev_put(dev);
dev_put_track(dev, &tunnel->dev_tracker);
}
static int ipip6_err(struct sk_buff *skb, u32 info)
@ -1463,7 +1463,7 @@ static int ipip6_tunnel_init(struct net_device *dev)
dev->tstats = NULL;
return err;
}
dev_hold(dev);
dev_hold_track(dev, &tunnel->dev_tracker, GFP_KERNEL);
return 0;
}