From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
netdev@vger.kernel.org, trond.myklebust@fys.uio.no,
neilb@suse.de, miklos@szeredi.hu, penberg@cs.helsinki.fi,
a.p.zijlstra@chello.nl
Subject: [PATCH 22/30] netfilter: NF_QUEUE vs emergency skbs
Date: Thu, 20 Mar 2008 21:11:04 +0100 [thread overview]
Message-ID: <20080320202124.669487000@chello.nl> (raw)
In-Reply-To: <20080320201042.675090000@chello.nl>
[-- Attachment #1: emergency-nf_queue.patch --]
[-- Type: text/plain, Size: 1060 bytes --]
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 <a.p.zijlstra@chello.nl>
---
net/netfilter/core.c | 3 +++
1 file changed, 3 insertions(+)
Index: linux-2.6/net/netfilter/core.c
===================================================================
--- linux-2.6.orig/net/netfilter/core.c
+++ linux-2.6/net/netfilter/core.c
@@ -176,9 +176,12 @@ next_hook:
ret = 1;
goto unlock;
} else if (verdict == NF_DROP) {
+drop:
kfree_skb(skb);
ret = -EPERM;
} else if ((verdict & NF_VERDICT_MASK) == NF_QUEUE) {
+ if (skb_emergency(*pskb))
+ goto drop;
if (!nf_queue(skb, elem, pf, hook, indev, outdev, okfn,
verdict >> NF_VERDICT_BITS))
goto next_hook;
--
--
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next prev parent reply other threads:[~2008-03-20 20:11 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-20 20:10 [PATCH 00/30] Swap over NFS -v17 Peter Zijlstra
2008-03-20 20:10 ` [PATCH 01/30] swap over network documentation Peter Zijlstra, Neil Brown
2008-03-20 21:20 ` Randy Dunlap
2008-03-20 20:10 ` [PATCH 02/30] mm: gfp_to_alloc_flags() Peter Zijlstra
2008-03-20 20:10 ` [PATCH 03/30] mm: tag reseve pages Peter Zijlstra
2008-03-20 20:10 ` [PATCH 04/30] mm: slub: trivial cleanups Peter Zijlstra
2008-03-20 20:10 ` [PATCH 05/30] mm: slb: add knowledge of reserve pages Peter Zijlstra
2008-03-20 20:10 ` [PATCH 06/30] mm: kmem_alloc_estimate() Peter Zijlstra
2008-03-20 20:10 ` [PATCH 07/30] mm: allow PF_MEMALLOC from softirq context Peter Zijlstra
2008-03-20 20:10 ` [PATCH 08/30] mm: serialize access to min_free_kbytes Peter Zijlstra
2008-03-20 20:10 ` [PATCH 09/30] mm: emergency pool Peter Zijlstra
2008-03-20 20:10 ` [PATCH 10/30] mm: system wide ALLOC_NO_WATERMARK Peter Zijlstra
2008-03-20 20:10 ` [PATCH 11/30] mm: __GFP_MEMALLOC Peter Zijlstra
2008-03-20 20:10 ` [PATCH 12/30] mm: memory reserve management Peter Zijlstra
2008-03-20 20:10 ` [PATCH 13/30] selinux: tag avc cache alloc as non-critical Peter Zijlstra
2008-03-20 20:10 ` [PATCH 14/30] net: wrap sk->sk_backlog_rcv() Peter Zijlstra
2008-03-20 20:10 ` [PATCH 15/30] net: packet split receive api Peter Zijlstra
2008-03-20 20:10 ` [PATCH 16/30] net: sk_allocation() - concentrate socket related allocations Peter Zijlstra
2008-03-20 20:10 ` [PATCH 17/30] netvm: network reserve infrastructure Peter Zijlstra
2008-03-20 20:11 ` [PATCH 18/30] netvm: INET reserves Peter Zijlstra
2008-03-20 20:11 ` [PATCH 19/30] netvm: hook skb allocation to reserves Peter Zijlstra
2008-03-20 20:11 ` [PATCH 20/30] netvm: filter emergency skbs Peter Zijlstra
2008-03-20 20:11 ` [PATCH 21/30] netvm: prevent a stream specific deadlock Peter Zijlstra
2008-03-20 20:11 ` Peter Zijlstra [this message]
2008-03-20 20:11 ` [PATCH 23/30] netvm: skb processing Peter Zijlstra
2008-03-20 20:11 ` [PATCH 24/30] mm: add support for non block device backed swap files Peter Zijlstra
2008-03-20 20:11 ` [PATCH 25/30] mm: methods for teaching filesystems about PG_swapcache pages Peter Zijlstra
2008-03-20 20:11 ` [PATCH 26/30] nfs: remove mempools Peter Zijlstra
2008-03-20 20:11 ` [PATCH 27/30] nfs: teach the NFS client how to treat PG_swapcache pages Peter Zijlstra
2008-03-20 20:11 ` [PATCH 28/30] nfs: disable data cache revalidation for swapfiles Peter Zijlstra
2008-03-20 20:11 ` [PATCH 29/30] nfs: enable swap on NFS Peter Zijlstra
2008-03-20 20:11 ` [PATCH 30/30] nfs: fix various memory recursions possible with swap over NFS Peter Zijlstra
2008-07-24 14:00 [PATCH 00/30] Swap over NFS -v18 Peter Zijlstra
2008-07-24 14:01 ` [PATCH 22/30] netfilter: NF_QUEUE vs emergency skbs Peter Zijlstra
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