[LARTC] rp_filter

[LARTC] rp_filter

[Krishnakumar. R]

Hi,

I was trying to figure out how the rp_filter does the
source address validation.

I traced out the location in source code(2.4.18) to
fib_validate_source() in net/ipv4/fib_frontend.c

But here the line where I think the rp filter comes in
 rpf = IN_DEV_RPFILTER(in_dev);

But this looks for the enabling of rp_filter for the all the interfaces and 
for the individual interfaces.

Then comes the line
if (rpf)
      goto e_inval;

That means if rp filtering is enabled return EINVAL!!!!!!

I seem to be missing a lot of things
Could someon please help me out on this ?


Regards
KK

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