ip logging function help

hello,
       By adding iptable rule
iptable -A OUTPUT -j LOG
 I am able to check log of each outgoing packets. But
i want to know who is actually calling ipt_log_target
function defined in ipt_LOG.c as
static unsigned int
ipt_log_target(struct sk_buff **pskb,
               unsigned int hooknum,
               const struct net_device *in,
               const struct net_device *out,
               const void *targinfo,
               void *userinfo)

I want to know which file in source code has pointer
to call ipt_log_target function? I want instance/copy
of const struct net_device *out to my function in
kernel to know that eth0 or eth1 is transmitting
packet.
Thanks in advance.
regards,
cranium


		
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