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    Subject[PATCH 22/30] netfilter: NF_QUEUE vs emergency skbs
    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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