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From: Matthieu Baerts <>
Subject: Re: [PATCH mptcp-net v7 4/5] mptcp: avoid processing packet if a subflow reset
Date: Fri, 25 Jun 2021 11:07:21 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Hi Jianguo,

Thank you for working on that!

On 25/06/2021 10:25, wrote:
> From: Jianguo Wu <>
> If check_fully_established() causes a subflow reset, it should not
> continue to process the packet in tcp_data_queue().
> Add a return value to mptcp_incoming_options(), and return 0 if a
> subflow has been reset, else return 1.

A small detail but it looks strange to me to return +1.
Maybe clearer to return -1 in case of error or return a boolean?

If you decide to return -1, please check for '< 0':

  if (mptcp_incoming_options(...) < 0) // error: we discard
      goto discard;

and not:

  if (mptcp_incoming_options(...)) // no error but we discard??
      goto discard;

(Or replace subflow_is_rst by subflow_is_accepted and return this
variable but it might be strange to return that if you don't have a DSS,

But if it is only me who find "strange" to return 0/+1, fine not to
change but it looks uncommon and maybe a source of misinterpretation :)

Tessares | Belgium | Hybrid Access Solutions

  parent reply	other threads:[~2021-06-25  9:07 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-25  8:25 [PATCH mptcp-net v7 0/5] Fix some mptcp syncookie process bugs wujianguo106
2021-06-25  8:25 ` [PATCH mptcp-net v7 1/5] mptcp: fix warning in __skb_flow_dissect() when do syn cookie for subflow join wujianguo106
2021-06-25  8:25 ` [PATCH mptcp-net v7 2/5] mptcp: remove redundant req destruct in subflow_check_req() wujianguo106
2021-06-25  8:25 ` [PATCH mptcp-net v7 3/5] mptcp: fix syncookie process if mptcp can not_accept new subflow wujianguo106
2021-06-25  8:25 ` [PATCH mptcp-net v7 4/5] mptcp: avoid processing packet if a subflow reset wujianguo106
2021-06-25  8:58   ` Geliang Tang
2021-06-25  9:07   ` Matthieu Baerts [this message]
2021-06-25  9:46     ` Jianguo Wu
2021-06-26  1:07       ` Mat Martineau
2021-06-25 10:38   ` Paolo Abeni
2021-06-25 10:45   ` Paolo Abeni
2021-06-26  8:59     ` Jianguo Wu
2021-06-25  8:25 ` [PATCH mptcp-net v7 5/5] selftests: mptcp: fix case multiple subflows limited by server wujianguo106

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