From: "Guodeqing (A)" <geffrey.guo@huawei.com>
To: Eric Dumazet <edumazet@google.com>
Cc: David Miller <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Mahesh Bandewar <maheshb@google.com>,
netdev <netdev@vger.kernel.org>
Subject: 答复: [PATCH,v2] ipvlan: add the check of ip header checksum
Date: Thu, 23 Jul 2020 02:02:25 +0000 [thread overview]
Message-ID: <5cb165d14bf146e38a11afe1c2ebfcab@huawei.com> (raw)
In-Reply-To: <CANn89iKKSOFSvtoFamuG1S1e5qb_WNpEdFgtQ-UtgkfWa0-WxA@mail.gmail.com>
Because ipvlan will do the ip forward, it will do a route lookup.if the ihl of the ip header is smaller than 5, this cause ip_fast_csum access the illegal address.
-----邮件原件-----
发件人: Eric Dumazet [mailto:edumazet@google.com]
发送时间: Thursday, July 23, 2020 0:30
收件人: Guodeqing (A) <geffrey.guo@huawei.com>
抄送: David Miller <davem@davemloft.net>; Jakub Kicinski <kuba@kernel.org>; Mahesh Bandewar <maheshb@google.com>; netdev <netdev@vger.kernel.org>
主题: Re: [PATCH,v2] ipvlan: add the check of ip header checksum
On Wed, Jul 22, 2020 at 2:23 AM guodeqing <geffrey.guo@huawei.com> wrote:
>
> The ip header checksum can be error in the following steps.
> $ ip netns add ns1
> $ ip link add gw link eth0 type ipvlan $ ip addr add 168.16.0.1/24 dev
> gw $ ip link set dev gw up $ ip link add ip1 link eth0 type ipvlan $
> ip link set ip1 netns ns1 $ ip netns exec ns1 ip link set ip1 up $ ip
> netns exec ns1 ip addr add 168.16.0.2/24 dev ip1 $ ip netns exec ns1
> tc qdisc add dev ip1 root netem corrupt 50% $ ip netns exec ns1 ping
> 168.16.0.1
>
> This is because the netem will modify the packet randomly. the
> corrupted packets should be dropped derectly, otherwise it may cause a
> problem.
And why would ipvlan be so special ?
What about all other drivers ?
My advice : Do not use netem corrupt if you do not want to send corrupted packets .
>
>
> Here I add the check of ip header checksum and drop the illegal
> packets in l3/l3s mode.
>
This patch makes no sense really.
>
> Signed-off-by: guodeqing <geffrey.guo@huawei.com>
> ---
next prev parent reply other threads:[~2020-07-23 2:02 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-22 9:18 [PATCH,v2] ipvlan: add the check of ip header checksum guodeqing
2020-07-22 16:29 ` Eric Dumazet
2020-07-23 2:02 ` Guodeqing (A) [this message]
2020-07-22 20:04 ` David Miller
2020-07-23 1:59 ` 答复: " Guodeqing (A)
2020-07-23 2:15 ` Eric Dumazet
2020-07-24 3:35 ` 答复: " Guodeqing (A)
2020-07-24 5:13 ` Eric Dumazet
2020-07-24 8:39 ` 答复: " Guodeqing (A)
2020-07-24 23:44 ` David Miller
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