From: yupeng <yupeng0...@gmail.com>
Date: Wed,  5 Dec 2018 18:56:28 -0800

> after set SO_DONTROUTE to 1, the IP layer should not route packets if
> the dest IP address is not in link scope. But if the socket has cached
> the dst_entry, such packets would be routed until the sk_dst_cache
> expires. So we should clean the sk_dst_cache when a user set
> SO_DONTROUTE option. Below are server/client python scripts which
> could reprodue this issue:
 ...
> Signed-off-by: yupeng <yupeng0...@gmail.com>

Applied.

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