netdev - Re: [PATCH net-next] sctp: sctp_transport_dst_check should check if transport pmtu is dst mtu

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Message-Id: <20170219.181955.660651394406915269.davem@davemloft.net>
Date:   Sun, 19 Feb 2017 18:19:55 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
        marcelo.leitner@...il.com, nhorman@...driver.com,
        vyasevich@...il.com
Subject: Re: [PATCH net-next] sctp: sctp_transport_dst_check should check
 if transport pmtu is dst mtu

From: Xin Long <lucien.xin@...il.com>
Date: Fri, 17 Feb 2017 16:41:45 +0800

> Now when sending a packet, sctp_transport_dst_check will check if dst
> is obsolete by calling ipv4/ip6_dst_check. But they return obsolete
> only when adding a new cache, after that when the cache's pmtu is
> updated again, it will not trigger transport->dst/pmtu's update.
> 
> It can be reproduced by reducing route's pmtu twice. At the 1st time
> client will add a new cache, and transport->pathmtu gets updated as
> sctp_transport_dst_check finds it's obsolete. But at the 2nd time,
> cache's mtu is updated, sctp client will never send out any packet,
> because transport->pmtu has no chance to update.
> 
> This patch is to fix this by also checking if transport pmtu is dst
> mtu in sctp_transport_dst_check, so that transport->pmtu can be
> updated on time.
> 
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied.