From: Hannes Frederic Sowa <hannes@stressinduktion.org>
To: lucien xin <lucien.xin@gmail.com>
Cc: network dev <netdev@vger.kernel.org>, Gao feng <gaofeng@cn.fujitsu.com>
Subject: Re: [PATCH] ipv6: ip6_append_data_mtu do not handle the mtu of the second fragment properly
Date: Wed, 12 Mar 2014 11:26:46 +0100 [thread overview]
Message-ID: <20140312102646.GD29404@order.stressinduktion.org> (raw)
In-Reply-To: <CADvbK_fS0rhPodczcZ52YN9D7NBY_TG+6xXvt-shvvz+e3qLnw@mail.gmail.com>
On Wed, Mar 12, 2014 at 10:40:50AM +0800, lucien xin wrote:
> but I cannot understand the top half of ip6_append_data() has the code
> to get mtu,
> if (rt->dst.flags & DST_XFRM_TUNNEL)
> mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?
> rt->dst.dev->mtu : dst_mtu(&rt->dst);
> else
> mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?
> rt->dst.dev->mtu : dst_mtu(rt->dst.path);
>
> why it need to calculate mtu again? just "mtu=*mtu +
> rt->dst.header_len", isn't it sufficient?
It would be possible if we are absolutely sure if we don't call
ip6_append_data_mtu a second time, which I have not yet reviewed.
The line I proposed above may also suffer from this problem.
Maybe you already checked that?
Greetings,
Hannes
next prev parent reply other threads:[~2014-03-12 10:26 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-11 4:31 [PATCH] ipv6: ip6_append_data_mtu do not handle the mtu of the second fragment properly Xin Long
2014-03-11 14:49 ` Hannes Frederic Sowa
2014-03-12 2:40 ` lucien xin
2014-03-12 10:26 ` Hannes Frederic Sowa [this message]
2014-03-13 5:38 ` lucien xin
2014-03-15 15:55 ` Hannes Frederic Sowa
2014-03-16 4:50 ` lucien xin
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