Subject: [PATCH 19/40] netfilter: notify about NF_QUEUE vs emergency skbs

From: Peter Zijlstra <[email-masked]>
Date: Fri, 04 May 2007 12:27:10 +0200

Avoid memory getting stuck waiting for userspace, drop all emergency packets.
This of course requires the regular storage route to not include an NF_QUEUE
target ;-)

Signed-off-by: Peter Zijlstra <[email-masked]>
Cc: Patrick McHardy <[email-masked]>
---
 net/netfilter/core.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-2.6-git/net/netfilter/core.c
===================================================================
--- linux-2.6-git.orig/net/netfilter/core.c	2007-02-22 15:48:28.000000000 +0100
+++ linux-2.6-git/net/netfilter/core.c	2007-02-26 14:23:25.000000000 +0100
@@ -184,9 +184,12 @@ next_hook:
 		ret = 1;
 		goto unlock;
 	} else if (verdict == NF_DROP) {
+drop:
 		kfree_skb(*pskb);
 		ret = -EPERM;
 	} else if ((verdict & NF_VERDICT_MASK)  == NF_QUEUE) {
+		if (skb_emergency(*pskb))
+			goto drop;
 		NFDEBUG("nf_hook: Verdict = QUEUE.\n");
 		if (!nf_queue(*pskb, elem, pf, hook, indev, outdev, okfn,
 			      verdict >> NF_VERDICT_BITS))

--