netdev - Re: [PATCHv2 net] sctp: sctp_diag should dump sctp socket type

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Message-ID: <20160531123508.GA6066@hmsreliant.think-freely.org>
Date:	Tue, 31 May 2016 08:35:08 -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,
	davem@...emloft.net,
	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
	Vlad Yasevich <vyasevich@...il.com>, daniel@...earbox.net,
	phil@....cc
Subject: Re: [PATCHv2 net] sctp: sctp_diag should dump sctp socket type

On Sun, May 29, 2016 at 05:42:13PM +0800, Xin Long wrote:
> Now we cannot distinguish that one sk is a udp or sctp style when
> we use ss to dump sctp_info. it's necessary to dump it as well.
> 
> For sctp_diag, ss support is not officially available, thus there
> are no official users of this yet, so we can add this field in the
> middle of sctp_info without breaking user API.
> 
> v1->v2:
>   - move 'sctpi_s_type' field to the end of struct sctp_info, so
>     that it won't cause incompatibility with applications already
>     built.
>   - add __reserved3 in sctp_info to make sure sctp_info is 8-byte
>     alignment.
> 
> Signed-off-by: Xin Long <lucien.xin@...il.com>
> ---
>  include/linux/sctp.h | 2 ++
>  net/sctp/socket.c    | 1 +
>  2 files changed, 3 insertions(+)
> 
> diff --git a/include/linux/sctp.h b/include/linux/sctp.h
> index dacb5e7..de1f643 100644
> --- a/include/linux/sctp.h
> +++ b/include/linux/sctp.h
> @@ -765,6 +765,8 @@ struct sctp_info {
>  	__u8	sctpi_s_disable_fragments;
>  	__u8	sctpi_s_v4mapped;
>  	__u8	sctpi_s_frag_interleave;
> +	__u32	sctpi_s_type;
> +	__u32	__reserved3;
>  };
>  
>  struct sctp_infox {
> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> index 777d032..67154b8 100644
> --- a/net/sctp/socket.c
> +++ b/net/sctp/socket.c
> @@ -4220,6 +4220,7 @@ int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
>  		info->sctpi_s_disable_fragments = sp->disable_fragments;
>  		info->sctpi_s_v4mapped = sp->v4mapped;
>  		info->sctpi_s_frag_interleave = sp->frag_interleave;
> +		info->sctpi_s_type = sp->type;
>  
>  		return 0;
>  	}
> -- 
> 2.1.0
> 
> --
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> 
Acked-by: Neil Horman <nhorman@...driver.com>