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

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Message-ID: <20180522123814.omrt6lzzfzdsvxjp@unicorn.suse.cz>
Date:   Tue, 22 May 2018 14:38:14 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     Xin Long <lucien.xin@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org,
        davem@...emloft.net,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>
Subject: Re: [PATCH net] sctp: fix the issue that flags are ignored when
 using kernel_connect

On Sun, May 20, 2018 at 04:39:10PM +0800, Xin Long wrote:
> 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>

Reviewed-by: Michal Kubecek <mkubecek@...e.cz>