netdev - Re: [PATCHv2 net-next] sctp: add support for SCTP_REUSE

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Date:   Thu, 14 Jun 2018 07:49:45 -0400
From:   Neil Horman <nhorman@...driver.com>
To:     Xin Long <lucien.xin@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Michael Tuexen <tuexen@...muenster.de>, davem@...emloft.net
Subject: Re: [PATCHv2 net-next] sctp: add support for SCTP_REUSE_PORT sockopt

On Thu, Jun 14, 2018 at 11:44:48AM +0800, Xin Long wrote:
> This feature is actually already supported by sk->sk_reuse which can be
> set by socket level opt SO_REUSEADDR. But it's not working exactly as
> RFC6458 demands in section 8.1.27, like:
> 
>   - This option only supports one-to-one style SCTP sockets
>   - This socket option must not be used after calling bind()
>     or sctp_bindx().
> 
> Besides, SCTP_REUSE_PORT sockopt should be provided for user's programs.
> Otherwise, the programs with SCTP_REUSE_PORT from other systems will not
> work in linux.
> 
> To separate it from the socket level version, this patch adds 'reuse' in
> sctp_sock and it works pretty much as sk->sk_reuse, but with some extra
> setup limitations that are needed when it is being enabled.
> 
> "It should be noted that the behavior of the socket-level socket option
> to reuse ports and/or addresses for SCTP sockets is unspecified", so it
> leaves SO_REUSEADDR as is for the compatibility.
> 
> Note that the name SCTP_REUSE_PORT is kind of confusing, it is identical
> to SO_REUSEADDR with some extra restriction, so here it uses 'reuse' in
> sctp_sock instead of 'reuseport'. As for sk->sk_reuseport support for
> SCTP, it will be added in another patch.
> 
> Thanks to Neil to make this clear.
> 
> v1->v2:
>   - add sctp_sk->reuse to separate it from the socket level version.
> 
Thanks Xin, Assuming some documentation for man sctp(7) is in the works

Acked-by: Neil Horman <nhorman@...driver.com>