linux-kernel - [PATCH net v2] netfilter: nf_queue:fix reinject verdict handling

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Message-Id: <20190513180225.5186-1-j.k.motwani@gmail.com>
Date:   Mon, 13 May 2019 23:32:25 +0530
From:   Jagdish Motwani <j.k.motwani@...il.com>
To:     netdev@...r.kernel.org, Pablo Neira Ayuso <pablo@...filter.org>
Cc:     j.k.motwani@...il.com,
        Jagdish Motwani <jagdish.motwani@...hos.com>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net v2] netfilter: nf_queue:fix reinject verdict handling

This patch fixes netfilter hook traversal when there are more than 1 hooks
returning NF_QUEUE verdict. When the first queue reinjects the packet,
'nf_reinject' starts traversing hooks with a proper hook_index. However, if it
again receives a NF_QUEUE verdict (by some other netfilter hook), it queues the
packet with a wrong hook_index. So, when the second queue reinjects the packet,
it re-executes hooks in between.

Fixes: 960632ece694 ("netfilter: convert hook list to an array")
Signed-off-by: Jagdish Motwani <jagdish.motwani@...hos.com>
---
 net/netfilter/nf_queue.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/netfilter/nf_queue.c b/net/netfilter/nf_queue.c
index 9dc1d6e..b5b2be5 100644
--- a/net/netfilter/nf_queue.c
+++ b/net/netfilter/nf_queue.c
@@ -255,6 +255,7 @@ static unsigned int nf_iterate(struct sk_buff *skb,
 repeat:
 		verdict = nf_hook_entry_hookfn(hook, skb, state);
 		if (verdict != NF_ACCEPT) {
+			*index = i;
 			if (verdict != NF_REPEAT)
 				return verdict;
 			goto repeat;
-- 
2.9.5