netdev - Re: [PATCHv2 net-next 7/8] sctp: update mid instead of ssn when doing stream and asoc reset

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Date:   Thu, 14 Dec 2017 16:26:33 -0200
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Xin Long <lucien.xin@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org,
        Neil Horman <nhorman@...driver.com>, davem@...emloft.net
Subject: Re: [PATCHv2 net-next 7/8] sctp: update mid instead of ssn when
 doing stream and asoc reset

On Fri, Dec 15, 2017 at 12:41:31AM +0800, Xin Long wrote:
> When using idata and doing stream and asoc reset, setting ssn with
> 0 could only clear the 1st 16 bits of mid.
> 
> So to make this work for both data and idata, it sets mid with 0
> instead of ssn, and also mid_uo for unordered idata also need to
> be cleared, as said in section 2.3.2 of RFC8260.
> 
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Acked-by: Marcelo R. Leitner <marcelo.leitner@...il.com>

> ---
>  net/sctp/stream.c | 40 +++++++++++++++++++++++++---------------
>  1 file changed, 25 insertions(+), 15 deletions(-)
> 
> diff --git a/net/sctp/stream.c b/net/sctp/stream.c
> index b3a9f37..06b644d 100644
> --- a/net/sctp/stream.c
> +++ b/net/sctp/stream.c
> @@ -216,11 +216,13 @@ void sctp_stream_clear(struct sctp_stream *stream)
>  {
>  	int i;
>  
> -	for (i = 0; i < stream->outcnt; i++)
> -		stream->out[i].ssn = 0;
> +	for (i = 0; i < stream->outcnt; i++) {
> +		stream->out[i].mid = 0;
> +		stream->out[i].mid_uo = 0;
> +	}
>  
>  	for (i = 0; i < stream->incnt; i++)
> -		stream->in[i].ssn = 0;
> +		stream->in[i].mid = 0;
>  }
>  
>  void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
> @@ -607,10 +609,10 @@ struct sctp_chunk *sctp_process_strreset_outreq(
>  		}
>  
>  		for (i = 0; i < nums; i++)
> -			stream->in[ntohs(str_p[i])].ssn = 0;
> +			stream->in[ntohs(str_p[i])].mid = 0;
>  	} else {
>  		for (i = 0; i < stream->incnt; i++)
> -			stream->in[i].ssn = 0;
> +			stream->in[i].mid = 0;
>  	}
>  
>  	result = SCTP_STRRESET_PERFORMED;
> @@ -783,10 +785,12 @@ struct sctp_chunk *sctp_process_strreset_tsnreq(
>  	/* G5:  The next expected and outgoing SSNs MUST be reset to 0 for all
>  	 *      incoming and outgoing streams.
>  	 */
> -	for (i = 0; i < stream->outcnt; i++)
> -		stream->out[i].ssn = 0;
> +	for (i = 0; i < stream->outcnt; i++) {
> +		stream->out[i].mid = 0;
> +		stream->out[i].mid_uo = 0;
> +	}
>  	for (i = 0; i < stream->incnt; i++)
> -		stream->in[i].ssn = 0;
> +		stream->in[i].mid = 0;
>  
>  	result = SCTP_STRRESET_PERFORMED;
>  
> @@ -976,11 +980,15 @@ struct sctp_chunk *sctp_process_strreset_resp(
>  
>  		if (result == SCTP_STRRESET_PERFORMED) {
>  			if (nums) {
> -				for (i = 0; i < nums; i++)
> -					stream->out[ntohs(str_p[i])].ssn = 0;
> +				for (i = 0; i < nums; i++) {
> +					stream->out[ntohs(str_p[i])].mid = 0;
> +					stream->out[ntohs(str_p[i])].mid_uo = 0;
> +				}
>  			} else {
> -				for (i = 0; i < stream->outcnt; i++)
> -					stream->out[i].ssn = 0;
> +				for (i = 0; i < stream->outcnt; i++) {
> +					stream->out[i].mid = 0;
> +					stream->out[i].mid_uo = 0;
> +				}
>  			}
>  
>  			flags = SCTP_STREAM_RESET_OUTGOING_SSN;
> @@ -1041,10 +1049,12 @@ struct sctp_chunk *sctp_process_strreset_resp(
>  			asoc->ctsn_ack_point = asoc->next_tsn - 1;
>  			asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
>  
> -			for (i = 0; i < stream->outcnt; i++)
> -				stream->out[i].ssn = 0;
> +			for (i = 0; i < stream->outcnt; i++) {
> +				stream->out[i].mid = 0;
> +				stream->out[i].mid_uo = 0;
> +			}
>  			for (i = 0; i < stream->incnt; i++)
> -				stream->in[i].ssn = 0;
> +				stream->in[i].mid = 0;
>  		}
>  
>  		for (i = 0; i < stream->outcnt; i++)
> -- 
> 2.1.0
> 
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