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The out_rt functions check to see if the mtu is large enough for the packet and, if not, send icmp messages (TOOBIG or DEST_UNREACH) to the source and bail out. We needed the ability to send ICMP from the out_rt_v6 function and DEST_UNREACH from the out_rt function, so we just pulled it out into a common function. Signed-off-by: Alex Gartrell <agartrell@fb.com> Acked-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: Simon Horman <horms@verge.net.au>