can't find a netfilter function implementation

Hello,

I work on Ubuntu 7.10 and I'm investigating the netfilter source code.  
I have downloaded the linux source using apt-get source linux-source-2.6.22

I'm looking for the nf_register_hook function which is declared in:
/usr/src/linux-headers-2.6.22-14/include/linux/netfilter.h or
/usr/src/linux-headers-2.6.22-14-generic/include/linux/netfilter.h

The problem is that I can't find the implementation of this function in linux-source-2.6.22-2.6.22/net/ipv4/netfilter.c

How is that possible? Can somebody please help?
CommsquareAsked:
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Duncan RoeConnect With a Mentor Software DeveloperCommented:
./net/netfilter/core.c:62:int nf_register_hook(struct nf_hook_ops *reg)
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