Re: ip_local_deliver

[mohanlal jangir <mohanlal@xxxxxxxxxxx>]

----- Original Message -----
From: <aksingh@xxxxxxxxxxx>
To: <kernelnewbies@xxxxxxxxxxxx>
Sent: Monday, May 31, 2004 9:55 PM
Subject: ip_local_deliver
>
> HI,
>
>   can I call ip_local_deliver/ip_route_output from my kernel module,
though
> it is not exported in /usr/src/linux-2.4/netsyms.c, is there no way that i
> can use it directly ?. Also, I see a problem with the linux kernel, any
> packet that comes from user applications, even one whose dest_ip_addr ==
> that of the local machine(the machine on which that application is
> running), even then the packet goes out of the machine, i.e if i write one
> such packet to ip using a raw socket,ip_local_deliver is not called for
> that packet immediately,
Calling ip_local_deliver for loopback packets immediately is bad idea ( I
think so). Think of tcp 3 way handshake, where tcp output function will call
ip output function. If ip output function immediately calls ip input
(ip_local_deliver) , ip input shall call tcp input and that will call again
tcp output for sending syn-ack. This process will continute further for ack.

 it first goes out of the ethernet interface and
> then is caught again, why so ? why is it kept this way ?
>
> thanks
> Amit
>
>
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>


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