netdev - Re: [PATCHv3 net-next 4/4] sctp: implement sender-side procedures for Add Incoming/Outgoing Streams Request Parameter

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Date:   Thu, 19 Jan 2017 15:17:18 -0500
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>,
        Vlad Yasevich <vyasevich@...il.com>, davem@...emloft.net
Subject: Re: [PATCHv3 net-next 4/4] sctp: implement sender-side procedures
 for Add Incoming/Outgoing Streams Request Parameter

On Fri, Jan 20, 2017 at 01:19:14AM +0800, Xin Long wrote:
> This patch is to implement Sender-Side Procedures for the Add
> Outgoing and Incoming Streams Request Parameter described in
> rfc6525 section 5.1.5-5.1.6.
> 
> It is also to add sockopt SCTP_ADD_STREAMS in rfc6525 section
> 6.3.4 for users.
> 
> Signed-off-by: Xin Long <lucien.xin@...il.com>
> ---
>  include/net/sctp/sctp.h   |  2 +
>  include/uapi/linux/sctp.h |  7 ++++
>  net/sctp/socket.c         | 29 ++++++++++++++
>  net/sctp/stream.c         | 99 +++++++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 137 insertions(+)
> 
> diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
> index b93820f..68ee1a6 100644
> --- a/include/net/sctp/sctp.h
> +++ b/include/net/sctp/sctp.h
> @@ -199,6 +199,8 @@ int sctp_offload_init(void);
>  int sctp_send_reset_streams(struct sctp_association *asoc,
>  			    struct sctp_reset_streams *params);
>  int sctp_send_reset_assoc(struct sctp_association *asoc);
> +int sctp_send_add_streams(struct sctp_association *asoc,
> +			  struct sctp_add_streams *params);
>  
>  /*
>   * Module global variables
> diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h
> index c0bd8c3..a91a9cc 100644
> --- a/include/uapi/linux/sctp.h
> +++ b/include/uapi/linux/sctp.h
> @@ -118,6 +118,7 @@ typedef __s32 sctp_assoc_t;
>  #define SCTP_ENABLE_STREAM_RESET	118
>  #define SCTP_RESET_STREAMS	119
>  #define SCTP_RESET_ASSOC	120
> +#define SCTP_ADD_STREAMS	121
>  
>  /* PR-SCTP policies */
>  #define SCTP_PR_SCTP_NONE	0x0000
> @@ -1027,4 +1028,10 @@ struct sctp_reset_streams {
>  	uint16_t srs_stream_list[];	/* list if srs_num_streams is not 0 */
>  };
>  
> +struct sctp_add_streams {
> +	sctp_assoc_t sas_assoc_id;
> +	uint16_t sas_instrms;
> +	uint16_t sas_outstrms;
> +};
> +
>  #endif /* _UAPI_SCTP_H */
> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> index 2c5c9ca..ae0a99e 100644
> --- a/net/sctp/socket.c
> +++ b/net/sctp/socket.c
> @@ -3838,6 +3838,32 @@ static int sctp_setsockopt_reset_assoc(struct sock *sk,
>  	return retval;
>  }
>  
> +static int sctp_setsockopt_add_streams(struct sock *sk,
> +				       char __user *optval,
> +				       unsigned int optlen)
> +{
you are going to need to provide some locking here or in sctp_send_add_streams.
By replacing the in/out streams pointer you run the risk of multiple callers
modifying the pointers in parallel, or in the sctp state machine reading it
while you do.

Neil