On Sat, Nov 25, 2017 at 09:05:33PM +0800, Xin Long wrote:
> Now the out stream reset in sctp stream reconf could be done even if
> the stream outq is not empty. It means that users can not be sure
> since which msg the new ssn will be used.
>
> To make this more synchronous, it shouldn't allow to do out stream
> reset until these chunks in unsent outq all are sent out.
>
> This patch checks the corresponding stream outqs when sending and
> processing the request . If any of them has unsent chunks in outq,
> it will return -EAGAIN instead or send SCTP_STRRESET_IN_PROGRESS
> back to the sender.
>
> Fixes: 7f9d68ac944e ("sctp: implement sender-side procedures for SSN Reset
> Request Parameter")
> Suggested-by: Marcelo Ricardo Leitner <marcelo.leit...@gmail.com>
> Signed-off-by: Xin Long <lucien....@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leit...@gmail.com>
> ---
> net/sctp/stream.c | 35 +++++++++++++++++++++++++++++++++++
> 1 file changed, 35 insertions(+)
>
> diff --git a/net/sctp/stream.c b/net/sctp/stream.c
> index 09c797a..b209037 100644
> --- a/net/sctp/stream.c
> +++ b/net/sctp/stream.c
> @@ -254,6 +254,30 @@ static int sctp_send_reconf(struct sctp_association
> *asoc,
> return retval;
> }
>
> +static bool sctp_stream_outq_is_empty(struct sctp_stream *stream,
> + __u16 str_nums, __be16 *str_list)
> +{
> + struct sctp_association *asoc;
> + __u16 i;
> +
> + asoc = container_of(stream, struct sctp_association, stream);
> + if (!asoc->outqueue.out_qlen)
> + return true;
> +
> + if (!str_nums)
> + return false;
> +
> + for (i = 0; i < str_nums; i++) {
> + __u16 sid = ntohs(str_list[i]);
> +
> + if (stream->out[sid].ext &&
> + !list_empty(&stream->out[sid].ext->outq))
> + return false;
> + }
> +
> + return true;
> +}
> +
> int sctp_send_reset_streams(struct sctp_association *asoc,
> struct sctp_reset_streams *params)
> {
> @@ -317,6 +341,11 @@ int sctp_send_reset_streams(struct sctp_association
> *asoc,
> for (i = 0; i < str_nums; i++)
> nstr_list[i] = htons(str_list[i]);
>
> + if (out && !sctp_stream_outq_is_empty(stream, str_nums, nstr_list)) {
> + retval = -EAGAIN;
> + goto out;
> + }
> +
> chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in);
>
> kfree(nstr_list);
> @@ -636,6 +665,12 @@ struct sctp_chunk *sctp_process_strreset_inreq(
> }
> }
>
> + if (!sctp_stream_outq_is_empty(stream, nums, str_p)) {
> + result = SCTP_STRRESET_IN_PROGRESS;
> + asoc->strreset_inseq--;
> + goto err;
> + }
> +
> chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0);
> if (!chunk)
> goto out;
> --
> 2.1.0
>
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