netdev - Re: [PATCH net] sctp: fix the issue that flags are ignored when using kernel

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Message-ID: <CADvbK_ekgZxdp0=Zcj8ZP003aodV01Fvf=GZzy_7wSxkuZimYA@mail.gmail.com>
Date:   Wed, 23 May 2018 14:55:08 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        Michal Kubecek <mkubecek@...e.cz>
Subject: Re: [PATCH net] sctp: fix the issue that flags are ignored when using kernel_connect

On Wed, May 23, 2018 at 1:40 AM, David Miller <davem@...emloft.net> wrote:
> From: Xin Long <lucien.xin@...il.com>
> Date: Sun, 20 May 2018 16:39:10 +0800
>
>> Now sctp uses inet_dgram_connect as its proto_ops .connect, and the flags
>> param can't be passed into its proto .connect where this flags is really
>> needed.
>>
>> sctp works around it by getting flags from socket file in __sctp_connect.
>> It works for connecting from userspace, as inherently the user sock has
>> socket file and it passes f_flags as the flags param into the proto_ops
>> .connect.
>>
>> However, the sock created by sock_create_kern doesn't have a socket file,
>> and it passes the flags (like O_NONBLOCK) by using the flags param in
>> kernel_connect, which calls proto_ops .connect later.
>>
>> So to fix it, this patch defines a new proto_ops .connect for sctp,
>> sctp_inet_connect, which calls __sctp_connect() directly with this
>> flags param. After this, the sctp's proto .connect can be removed.
>>
>> Note that sctp_inet_connect doesn't need to do some checks that are not
>> needed for sctp, which makes thing better than with inet_dgram_connect.
>>
>> Suggested-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
>> Signed-off-by: Xin Long <lucien.xin@...il.com>
>
> Applied, thank you.
>
> I don't see a Fixes: tag, please give me some guidance me wrt. -stable.
The problem is there since the beginning, I think there's no need
to go to -stable.