netfilter: xt_NFQUEUE: fix --queue-bypass regression

V3 of the NFQUEUE target ignores the --queue-bypass flag,
causing packets to be dropped when the userspace listener
isn't running.

Regression is in since 8746ddcf12bb26 ("netfilter: xt_NFQUEUE:
introduce CPU fanout").

Reported-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Holger Eitzenberger <holger@eitzenberger.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/xt_NFQUEUE.c b/net/netfilter/xt_NFQUEUE.c
index 1e2fae3..ed00fef 100644 (file)
--- a/net/netfilter/xt_NFQUEUE.c
+++ b/net/netfilter/xt_NFQUEUE.c
@@ -147,6 +147,7 @@ nfqueue_tg_v3(struct sk_buff *skb, const struct xt_action_param *par)
 {
        const struct xt_NFQ_info_v3 *info = par->targinfo;
        u32 queue = info->queuenum;
+       int ret;
 
        if (info->queues_total > 1) {
                if (info->flags & NFQ_FLAG_CPU_FANOUT) {
@@ -157,7 +158,11 @@ nfqueue_tg_v3(struct sk_buff *skb, const struct xt_action_param *par)
                        queue = nfqueue_hash(skb, par);
        }
 
-       return NF_QUEUE_NR(queue);
+       ret = NF_QUEUE_NR(queue);
+       if (info->flags & NFQ_FLAG_BYPASS)
+               ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
+
+       return ret;
 }
 
 static struct xt_target nfqueue_tg_reg[] __read_mostly = {