Re: [PATCHv2 net] ipv6: use rt6_info members when dst is set in rt6_fill_node

[David Miller <davem@davemloft.net>]

From: Xin Long <lucien.xin@gmail.com>
Date: Tue, 11 Sep 2018 14:33:58 +0800

> In inet6_rtm_getroute, since Commit 93531c674315 ("net/ipv6: separate
> handling of FIB entries from dst based routes"), it has used rt->from
> to dump route info instead of rt.
> 
> However for some route like cache, some of its information like flags
> or gateway is not the same as that of the 'from' one. It caused 'ip
> route get' to dump the wrong route information.
> 
> In Jianlin's testing, the output information even lost the expiration
> time for a pmtu route cache due to the wrong fib6_flags.
> 
> So change to use rt6_info members for dst addr, src addr, flags and
> gateway when it tries to dump a route entry without fibmatch set.
> 
> v1->v2:
>   - not use rt6i_prefsrc.
>   - also fix the gw dump issue.
> 
> Fixes: 93531c674315 ("net/ipv6: separate handling of FIB entries from dst based routes")
> Reported-by: Jianlin Shi <jishi@redhat.com>
> Signed-off-by: Xin Long <lucien.xin@gmail.com>

Applied and queued up for -stable, thanks Xin.