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From: Patrick McHardy on 1 Feb 2010 09:10
Jan Engelhardt wrote:
> On Sunday 2010-01-31 03:13, Helight.Xu wrote:
>
>> hi all gys:
>>
>> when I make LKM with netfilter on "NF_IP_PRE_ROUTING" point, but it was
>> reported that "NF_IP_PRE_ROUTING" is not defined.
>>
>> but I am surely including <linux/netfilter_ipv4.h>, when I opened
>> include/linux/netfilter_ipv4.h I found that
>> "NF_IP_PRE_ROUTING" is in this lable :
>> #ifndef __KERNEL__
>> .....
>> /* IP Hooks */
>> /* After promisc drops, checksum checks. */
>> #define NF_IP_PRE_ROUTING 0
>> /* If the packet is destined for this box. */
>> #define NF_IP_LOCAL_IN 1
>> /* If the packet is destined for another interface. */
>> #define NF_IP_FORWARD 2
>> /* Packets coming from a local process. */
>> #define NF_IP_LOCAL_OUT 3
>> /* Packets about to hit the wire. */
>> #define NF_IP_POST_ROUTING 4
>> #define NF_IP_NUMHOOKS 5
>> #endif /* ! __KERNEL__ */
>>
>> So I think the "endif" is ended a little early!
>
> Seems so. Are there any out-of-tree nf_ip_hook_priorities users? If not,
> we could possibly move it further below.

Its only available for userspace for compatibility reasons,
the kernel doesn't use the old definitions.
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Next: IRQ regression messes up xseries 330 SCI resulting in apic=off - bisected to commit b9c61b70075c87a861262473