From: David Ahern <d...@cumulusnetworks.com>
Date: Mon, 31 Aug 2015 09:29:40 -0700

> Remove the VRF change in udp_sendmsg to set the source address. The VRF
> driver already has access to the packet on the TX path via the dst. It
> can be used to update the source address in the header.
> 
> Update function based on OVS.
> 
> Cc: Tom Herbert <t...@herbertland.com>
> Signed-off-by: David Ahern <d...@cumulusnetworks.com>

This is worse.

You have the source address in the VRF driver's output routine in
fl4.saddr, just use it as-is.

You're adding even more route lookups, at least the existing code
just walks the device address less which is often cheaper than
a full-blown route lookup.
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