Re: Mail delivery failed: returning message to sender

["David S. Miller" <davem@xxxxxxxxxx>]

   From: kuznet@xxxxxxxxxxxxx
   Date: Wed, 21 May 2003 06:22:10 +0400 (MSD)
   
   > Russel, please retest using this patch.  This piece of
   > code needs to be audited further.
   
   Relax, it is right now.
   
   I hope it is the only place where route is copied as whole.

I explicitly zeroed out child and xfrm in my final version.
These should never be non-NULL, it is pure paranoia on my part :-)

IP6 makes this more intelligently using ip6_route_copy() function.
We should probably make similar beast for ipv4 just for clarity's
sake.