netfilter: nf_queue: enqueue skbs with NULL dst

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>
This commit is contained in:
Marco Oliverio 2019-12-02 19:54:30 +01:00 коммит произвёл Pablo Neira Ayuso
Родитель 5a2e6af818
Коммит 0b9173f468
1 изменённых файлов: 1 добавлений и 1 удалений

Просмотреть файл

@ -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;
}