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netfilter: nf_queue: enqueue skbs with NULL dst 

commit 0b9173f4688dfa7c5d723426be1d979c24ce3d51 upstream.

Bridge packets that are forwarded have skb->dst == NULL and get
dropped by the check introduced by
b60a77386b (net: make skb_dst_force
return true when dst is refcounted).

To fix this we check skb_dst() before skb_dst_force(), so we don't
drop skb packet with dst == NULL. This holds also for skb at the
PRE_ROUTING hook so we remove the second check.

Fixes: b60a77386b ("net: make skb_dst_force return true when dst is refcounted")
Signed-off-by: Marco Oliverio <marco.oliverio@tanaza.com>
Signed-off-by: Rocco Folino <rocco.folino@tanaza.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marco Oliverio 2019-12-02 19:54:30 +01:00 committed by Greg Kroah-Hartman
parent f6cc75f1d7
commit 3d8ff70c73
1 changed files with 1 additions and 1 deletions
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2
net/netfilter/nf_queue.c
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@ -189,7 +189,7 @@ static int __nf_queue(struct sk_buff *skb, const struct nf_hook_state *state,
goto err;
}
if (!skb_dst_force(skb) && state->hook != NF_INET_PRE_ROUTING) {
if (skb_dst(skb) && !skb_dst_force(skb)) {
status = -ENETDOWN;
goto err;
}