Commit 6b56b1a2 authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'sctp-stream-reconfig-fixes' 



Xin Long says:

====================
sctp: a bunch of fixes for stream reconfig

This patchset is to make stream reset and asoc reset work more correctly
for stream reconfig.

Thank to Marcelo making them very clear.
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 67c8d22a 52a39589

net/sctp/stream.c

+65 −12
Original line number Diff line number Diff line
@@ -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);
@@ -377,6 +406,9 @@ int sctp_send_reset_assoc(struct sctp_association *asoc) 
	if (asoc->strreset_outstanding)

		return -EINPROGRESS;



	if (!sctp_outq_is_empty(&asoc->outqueue))

		return -EAGAIN;



	chunk = sctp_make_strreset_tsnreq(asoc);

	if (!chunk)

		return -ENOMEM;
@@ -563,7 +595,7 @@ struct sctp_chunk *sctp_process_strreset_outreq( 
		flags = SCTP_STREAM_RESET_INCOMING_SSN;

	}



	nums = (ntohs(param.p->length) - sizeof(*outreq)) / 2;

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

	if (nums) {

		str_p = outreq->list_of_streams;

		for (i = 0; i < nums; i++) {
@@ -627,7 +659,7 @@ struct sctp_chunk *sctp_process_strreset_inreq( 
		goto out;

	}



	nums = (ntohs(param.p->length) - sizeof(*inreq)) / 2;

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

	str_p = inreq->list_of_streams;

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

		if (ntohs(str_p[i]) >= stream->outcnt) {
@@ -636,6 +668,12 @@ 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;
@@ -687,12 +725,18 @@ struct sctp_chunk *sctp_process_strreset_tsnreq( 
		i = asoc->strreset_inseq - request_seq - 1;

		result = asoc->strreset_result[i];

		if (result == SCTP_STRRESET_PERFORMED) {

			next_tsn = asoc->next_tsn;

			next_tsn = asoc->ctsn_ack_point + 1;

			init_tsn =

				sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1;

		}

		goto err;

	}



	if (!sctp_outq_is_empty(&asoc->outqueue)) {

		result = SCTP_STRRESET_IN_PROGRESS;

		goto err;

	}



	asoc->strreset_inseq++;



	if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
@@ -703,9 +747,10 @@ struct sctp_chunk *sctp_process_strreset_tsnreq( 
		goto out;

	}



	/* G3: The same processing as though a SACK chunk with no gap report

	 *     and a cumulative TSN ACK of the Sender's Next TSN minus 1 were

	 *     received MUST be performed.

	/* G4: The same processing as though a FWD-TSN chunk (as defined in

	 *     [RFC3758]) with all streams affected and a new cumulative TSN

	 *     ACK of the Receiver's Next TSN minus 1 were received MUST be

	 *     performed.

	 */

	max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);

	sctp_ulpq_reasm_flushtsn(&asoc->ulpq, max_tsn_seen);
@@ -720,10 +765,9 @@ struct sctp_chunk *sctp_process_strreset_tsnreq( 
	sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,

			 init_tsn, GFP_ATOMIC);



	/* G4: The same processing as though a FWD-TSN chunk (as defined in

	 *     [RFC3758]) with all streams affected and a new cumulative TSN

	 *     ACK of the Receiver's Next TSN minus 1 were received MUST be

	 *     performed.

	/* G3: The same processing as though a SACK chunk with no gap report

	 *     and a cumulative TSN ACK of the Sender's Next TSN minus 1 were

	 *     received MUST be performed.

	 */

	sctp_outq_free(&asoc->outqueue);
@@ -927,7 +971,8 @@ struct sctp_chunk *sctp_process_strreset_resp( 


		outreq = (struct sctp_strreset_outreq *)req;

		str_p = outreq->list_of_streams;

		nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) / 2;

		nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) /

		       sizeof(__u16);



		if (result == SCTP_STRRESET_PERFORMED) {

			if (nums) {
@@ -956,7 +1001,8 @@ struct sctp_chunk *sctp_process_strreset_resp( 


		inreq = (struct sctp_strreset_inreq *)req;

		str_p = inreq->list_of_streams;

		nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) / 2;

		nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) /

		       sizeof(__u16);



		*evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,

			nums, str_p, GFP_ATOMIC);
@@ -975,6 +1021,7 @@ struct sctp_chunk *sctp_process_strreset_resp( 
		if (result == SCTP_STRRESET_PERFORMED) {

			__u32 mtsn = sctp_tsnmap_get_max_tsn_seen(

						&asoc->peer.tsn_map);

			LIST_HEAD(temp);



			sctp_ulpq_reasm_flushtsn(&asoc->ulpq, mtsn);

			sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
@@ -983,7 +1030,13 @@ struct sctp_chunk *sctp_process_strreset_resp( 
					 SCTP_TSN_MAP_INITIAL,

					 stsn, GFP_ATOMIC);



			/* Clean up sacked and abandoned queues only. As the

			 * out_chunk_list may not be empty, splice it to temp,

			 * then get it back after sctp_outq_free is done.

			 */

			list_splice_init(&asoc->outqueue.out_chunk_list, &temp);

			sctp_outq_free(&asoc->outqueue);

			list_splice_init(&temp, &asoc->outqueue.out_chunk_list);



			asoc->next_tsn = rtsn;

			asoc->ctsn_ack_point = asoc->next_tsn - 1;

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