Commit 2e6dc4d9 authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

sctp: improve the events for sctp stream reset 



This patch is to improve sctp stream reset events in 4 places:

  1. In sctp_process_strreset_outreq(), the flag should always be set with
     SCTP_STREAM_RESET_INCOMING_SSN instead of OUTGOING, as receiver's in
     stream is reset here.
  2. In sctp_process_strreset_outreq(), move up SCTP_STRRESET_ERR_WRONG_SSN
     check, as the reset has to succeed after reconf_timer stops for the
     in stream reset request retransmission.
  3. In sctp_process_strreset_inreq(), no event should be sent, as no in
     or out stream is reset here.
  4. In sctp_process_strreset_resp(), SCTP_STREAM_RESET_INCOMING_SSN or
     OUTGOING event should always be sent for stream reset requests, no
     matter it fails or succeeds to process the request.

Fixes: 81054476 ("sctp: implement receiver-side procedures for the Outgoing SSN Reset Request Parameter")
Fixes: 16e1a919 ("sctp: implement receiver-side procedures for the Incoming SSN Reset Request Parameter")
Fixes: 11ae76e6 ("sctp: implement receiver-side procedures for the Reconf Response Parameter")
Reported-by: default avatarYing Xu <yinxu@redhat.com>
Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d71b5753

net/sctp/stream.c

+17 −22
Original line number Diff line number Diff line
@@ -585,9 +585,9 @@ struct sctp_chunk *sctp_process_strreset_outreq( 
	struct sctp_strreset_outreq *outreq = param.v;

	struct sctp_stream *stream = &asoc->stream;

	__u32 result = SCTP_STRRESET_DENIED;

	__u16 i, nums, flags = 0;

	__be16 *str_p = NULL;

	__u32 request_seq;

	__u16 i, nums;



	request_seq = ntohl(outreq->request_seq);
@@ -615,6 +615,15 @@ struct sctp_chunk *sctp_process_strreset_outreq( 
	if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))

		goto out;



	nums = (ntohs(param.p->length) - sizeof(*outreq)) / sizeof(__u16);

	str_p = outreq->list_of_streams;

	for (i = 0; i < nums; i++) {

		if (ntohs(str_p[i]) >= stream->incnt) {

			result = SCTP_STRRESET_ERR_WRONG_SSN;

			goto out;

		}

	}



	if (asoc->strreset_chunk) {

		if (!sctp_chunk_lookup_strreset_param(

				asoc, outreq->response_seq,
@@ -637,32 +646,19 @@ struct sctp_chunk *sctp_process_strreset_outreq( 
			sctp_chunk_put(asoc->strreset_chunk);

			asoc->strreset_chunk = NULL;

		}



		flags = SCTP_STREAM_RESET_INCOMING_SSN;

	}



	nums = (ntohs(param.p->length) - sizeof(*outreq)) / sizeof(__u16);

	if (nums) {

		str_p = outreq->list_of_streams;

		for (i = 0; i < nums; i++) {

			if (ntohs(str_p[i]) >= stream->incnt) {

				result = SCTP_STRRESET_ERR_WRONG_SSN;

				goto out;

			}

	}



	if (nums)

		for (i = 0; i < nums; i++)

			SCTP_SI(stream, ntohs(str_p[i]))->mid = 0;

	} else {

	else

		for (i = 0; i < stream->incnt; i++)

			SCTP_SI(stream, i)->mid = 0;

	}



	result = SCTP_STRRESET_PERFORMED;



	*evp = sctp_ulpevent_make_stream_reset_event(asoc,

		flags | SCTP_STREAM_RESET_OUTGOING_SSN, nums, str_p,

		GFP_ATOMIC);

		SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);



out:

	sctp_update_strreset_result(asoc, result);
@@ -738,9 +734,6 @@ struct sctp_chunk *sctp_process_strreset_inreq( 


	result = SCTP_STRRESET_PERFORMED;



	*evp = sctp_ulpevent_make_stream_reset_event(asoc,

		SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);



out:

	sctp_update_strreset_result(asoc, result);

err:
@@ -1036,10 +1029,10 @@ struct sctp_chunk *sctp_process_strreset_resp( 
					sout->mid_uo = 0;

				}

			}



			flags = SCTP_STREAM_RESET_OUTGOING_SSN;

		}



		flags |= SCTP_STREAM_RESET_OUTGOING_SSN;



		for (i = 0; i < stream->outcnt; i++)

			SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
@@ -1058,6 +1051,8 @@ struct sctp_chunk *sctp_process_strreset_resp( 
		nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) /

		       sizeof(__u16);



		flags |= SCTP_STREAM_RESET_INCOMING_SSN;



		*evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,

			nums, str_p, GFP_ATOMIC);

	} else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) {

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