target, match and checkentry functions

[Ozgur AKAN <akan@aiqa.com>]

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Hi,

I am reading ip_tables.h. There is a structure called  ipt_target. In it 
there is pointer to a function which is below.

unsigned int (*target <http://lxr.linux.no/ident?i=target>)(struct sk_buff <http://lxr.linux.no/ident?i=sk_buff> **pskb, .......)

I can not find the original function that this function pointer(*target) points. When I search for target, I see that it is defined in 6 files. Which one is used and when? How can I understand it? (this is same for match and checkentry functions)

6 files in which target is defined;

    * net/ipv4/netfilter/ipt_ECN.c, line 104
      <http://lxr.linux.no/source/net/ipv4/netfilter/ipt_ECN.c#L104>
    * net/ipv4/netfilter/ipt_DSCP.c, line 25
      <http://lxr.linux.no/source/net/ipv4/netfilter/ipt_DSCP.c#L25>
    * net/ipv4/netfilter/ipt_MARK.c, line 11
      <http://lxr.linux.no/source/net/ipv4/netfilter/ipt_MARK.c#L11>
    * net/ipv4/netfilter/ipt_TOS.c, line 11
      <http://lxr.linux.no/source/net/ipv4/netfilter/ipt_TOS.c#L11>
    * net/ipv6/netfilter/ip6t_MARK.c, line 11
      <http://lxr.linux.no/source/net/ipv6/netfilter/ip6t_MARK.c#L11>

thanks,

-- 
Ozgur Akan


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