Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1186 insertions, 0 deletions

diff --git a/net/sctp/stream.c b/net/sctp/stream.c
new file mode 100644
index 000000000..516bc48be
--- /dev/null
+++ b/net/sctp/stream.c
@@ -0,0 +1,1186 @@
+/* SCTP kernel implementation
+ * (C) Copyright IBM Corp. 2001, 2004
+ * Copyright (c) 1999-2000 Cisco, Inc.
+ * Copyright (c) 1999-2001 Motorola, Inc.
+ * Copyright (c) 2001 Intel Corp.
+ *
+ * This file is part of the SCTP kernel implementation
+ *
+ * This file contains sctp stream maniuplation primitives and helpers.
+ *
+ * This SCTP implementation is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ *                 ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ *    lksctp developers <linux-sctp@vger.kernel.org>
+ *
+ * Written or modified by:
+ *    Xin Long <lucien.xin@gmail.com>
+ */
+
+#include <linux/list.h>
+#include <net/sctp/sctp.h>
+#include <net/sctp/sm.h>
+#include <net/sctp/stream_sched.h>
+
+static struct flex_array *fa_alloc(size_t elem_size, size_t elem_count,
+				   gfp_t gfp)
+{
+	struct flex_array *result;
+	int err;
+
+	result = flex_array_alloc(elem_size, elem_count, gfp);
+	if (result) {
+		err = flex_array_prealloc(result, 0, elem_count, gfp);
+		if (err) {
+			flex_array_free(result);
+			result = NULL;
+		}
+	}
+
+	return result;
+}
+
+static void fa_free(struct flex_array *fa)
+{
+	if (fa)
+		flex_array_free(fa);
+}
+
+static void fa_copy(struct flex_array *fa, struct flex_array *from,
+		    size_t index, size_t count)
+{
+	void *elem;
+
+	while (count--) {
+		elem = flex_array_get(from, index);
+		flex_array_put(fa, index, elem, 0);
+		index++;
+	}
+}
+
+static void fa_zero(struct flex_array *fa, size_t index, size_t count)
+{
+	void *elem;
+
+	while (count--) {
+		elem = flex_array_get(fa, index);
+		memset(elem, 0, fa->element_size);
+		index++;
+	}
+}
+
+static size_t fa_index(struct flex_array *fa, void *elem, size_t count)
+{
+	size_t index = 0;
+
+	while (count--) {
+		if (elem == flex_array_get(fa, index))
+			break;
+		index++;
+	}
+
+	return index;
+}
+
+static void sctp_stream_shrink_out(struct sctp_stream *stream, __u16 outcnt)
+{
+	struct sctp_association *asoc;
+	struct sctp_chunk *ch, *temp;
+	struct sctp_outq *outq;
+
+	asoc = container_of(stream, struct sctp_association, stream);
+	outq = &asoc->outqueue;
+
+	list_for_each_entry_safe(ch, temp, &outq->out_chunk_list, list) {
+		__u16 sid = sctp_chunk_stream_no(ch);
+
+		if (sid < outcnt)
+			continue;
+
+		sctp_sched_dequeue_common(outq, ch);
+		/* No need to call dequeue_done here because
+		 * the chunks are not scheduled by now.
+		 */
+
+		/* Mark as failed send. */
+		sctp_chunk_fail(ch, (__force __u32)SCTP_ERROR_INV_STRM);
+		if (asoc->peer.prsctp_capable &&
+		    SCTP_PR_PRIO_ENABLED(ch->sinfo.sinfo_flags))
+			asoc->sent_cnt_removable--;
+
+		sctp_chunk_free(ch);
+	}
+}
+
+/* Migrates chunks from stream queues to new stream queues if needed,
+ * but not across associations. Also, removes those chunks to streams
+ * higher than the new max.
+ */
+static void sctp_stream_outq_migrate(struct sctp_stream *stream,
+				     struct sctp_stream *new, __u16 outcnt)
+{
+	int i;
+
+	if (stream->outcnt > outcnt)
+		sctp_stream_shrink_out(stream, outcnt);
+
+	if (new) {
+		/* Here we actually move the old ext stuff into the new
+		 * buffer, because we want to keep it. Then
+		 * sctp_stream_update will swap ->out pointers.
+		 */
+		for (i = 0; i < outcnt; i++) {
+			kfree(SCTP_SO(new, i)->ext);
+			SCTP_SO(new, i)->ext = SCTP_SO(stream, i)->ext;
+			SCTP_SO(stream, i)->ext = NULL;
+		}
+	}
+
+	for (i = outcnt; i < stream->outcnt; i++) {
+		kfree(SCTP_SO(stream, i)->ext);
+		SCTP_SO(stream, i)->ext = NULL;
+	}
+}
+
+static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt,
+				 gfp_t gfp)
+{
+	struct flex_array *out;
+	size_t elem_size = sizeof(struct sctp_stream_out);
+
+	out = fa_alloc(elem_size, outcnt, gfp);
+	if (!out)
+		return -ENOMEM;
+
+	if (stream->out) {
+		fa_copy(out, stream->out, 0, min(outcnt, stream->outcnt));
+		if (stream->out_curr) {
+			size_t index = fa_index(stream->out, stream->out_curr,
+						stream->outcnt);
+
+			BUG_ON(index == stream->outcnt);
+			stream->out_curr = flex_array_get(out, index);
+		}
+		fa_free(stream->out);
+	}
+
+	if (outcnt > stream->outcnt)
+		fa_zero(out, stream->outcnt, (outcnt - stream->outcnt));
+
+	stream->out = out;
+
+	return 0;
+}
+
+static int sctp_stream_alloc_in(struct sctp_stream *stream, __u16 incnt,
+				gfp_t gfp)
+{
+	struct flex_array *in;
+	size_t elem_size = sizeof(struct sctp_stream_in);
+
+	in = fa_alloc(elem_size, incnt, gfp);
+	if (!in)
+		return -ENOMEM;
+
+	if (stream->in) {
+		fa_copy(in, stream->in, 0, min(incnt, stream->incnt));
+		fa_free(stream->in);
+	}
+
+	if (incnt > stream->incnt)
+		fa_zero(in, stream->incnt, (incnt - stream->incnt));
+
+	stream->in = in;
+
+	return 0;
+}
+
+int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
+		     gfp_t gfp)
+{
+	struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
+	int i, ret = 0;
+
+	gfp |= __GFP_NOWARN;
+
+	/* Initial stream->out size may be very big, so free it and alloc
+	 * a new one with new outcnt to save memory if needed.
+	 */
+	if (outcnt == stream->outcnt)
+		goto in;
+
+	/* Filter out chunks queued on streams that won't exist anymore */
+	sched->unsched_all(stream);
+	sctp_stream_outq_migrate(stream, NULL, outcnt);
+	sched->sched_all(stream);
+
+	ret = sctp_stream_alloc_out(stream, outcnt, gfp);
+	if (ret)
+		goto out;
+
+	stream->outcnt = outcnt;
+	for (i = 0; i < stream->outcnt; i++)
+		SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
+
+in:
+	sctp_stream_interleave_init(stream);
+	if (!incnt)
+		goto out;
+
+	ret = sctp_stream_alloc_in(stream, incnt, gfp);
+	if (ret) {
+		sched->free(stream);
+		fa_free(stream->out);
+		stream->out = NULL;
+		stream->outcnt = 0;
+		goto out;
+	}
+
+	stream->incnt = incnt;
+
+out:
+	return ret;
+}
+
+int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid)
+{
+	struct sctp_stream_out_ext *soute;
+	int ret;
+
+	soute = kzalloc(sizeof(*soute), GFP_KERNEL);
+	if (!soute)
+		return -ENOMEM;
+	SCTP_SO(stream, sid)->ext = soute;
+
+	ret = sctp_sched_init_sid(stream, sid, GFP_KERNEL);
+	if (ret) {
+		kfree(SCTP_SO(stream, sid)->ext);
+		SCTP_SO(stream, sid)->ext = NULL;
+	}
+
+	return ret;
+}
+
+void sctp_stream_free(struct sctp_stream *stream)
+{
+	struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
+	int i;
+
+	sched->free(stream);
+	for (i = 0; i < stream->outcnt; i++)
+		kfree(SCTP_SO(stream, i)->ext);
+	fa_free(stream->out);
+	fa_free(stream->in);
+}
+
+void sctp_stream_clear(struct sctp_stream *stream)
+{
+	int i;
+
+	for (i = 0; i < stream->outcnt; i++) {
+		SCTP_SO(stream, i)->mid = 0;
+		SCTP_SO(stream, i)->mid_uo = 0;
+	}
+
+	for (i = 0; i < stream->incnt; i++)
+		SCTP_SI(stream, i)->mid = 0;
+}
+
+void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
+{
+	struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
+
+	sched->unsched_all(stream);
+	sctp_stream_outq_migrate(stream, new, new->outcnt);
+	sctp_stream_free(stream);
+
+	stream->out = new->out;
+	stream->in  = new->in;
+	stream->outcnt = new->outcnt;
+	stream->incnt  = new->incnt;
+
+	sched->sched_all(stream);
+
+	new->out = NULL;
+	new->in  = NULL;
+	new->outcnt = 0;
+	new->incnt  = 0;
+}
+
+static int sctp_send_reconf(struct sctp_association *asoc,
+			    struct sctp_chunk *chunk)
+{
+	struct net *net = sock_net(asoc->base.sk);
+	int retval = 0;
+
+	retval = sctp_primitive_RECONF(net, asoc, chunk);
+	if (retval)
+		sctp_chunk_free(chunk);
+
+	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 (SCTP_SO(stream, sid)->ext &&
+		    !list_empty(&SCTP_SO(stream, sid)->ext->outq))
+			return false;
+	}
+
+	return true;
+}
+
+int sctp_send_reset_streams(struct sctp_association *asoc,
+			    struct sctp_reset_streams *params)
+{
+	struct sctp_stream *stream = &asoc->stream;
+	__u16 i, str_nums, *str_list;
+	struct sctp_chunk *chunk;
+	int retval = -EINVAL;
+	__be16 *nstr_list;
+	bool out, in;
+
+	if (!asoc->peer.reconf_capable ||
+	    !(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) {
+		retval = -ENOPROTOOPT;
+		goto out;
+	}
+
+	if (asoc->strreset_outstanding) {
+		retval = -EINPROGRESS;
+		goto out;
+	}
+
+	out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING;
+	in  = params->srs_flags & SCTP_STREAM_RESET_INCOMING;
+	if (!out && !in)
+		goto out;
+
+	str_nums = params->srs_number_streams;
+	str_list = params->srs_stream_list;
+	if (str_nums) {
+		int param_len = 0;
+
+		if (out) {
+			for (i = 0; i < str_nums; i++)
+				if (str_list[i] >= stream->outcnt)
+					goto out;
+
+			param_len = str_nums * sizeof(__u16) +
+				    sizeof(struct sctp_strreset_outreq);
+		}
+
+		if (in) {
+			for (i = 0; i < str_nums; i++)
+				if (str_list[i] >= stream->incnt)
+					goto out;
+
+			param_len += str_nums * sizeof(__u16) +
+				     sizeof(struct sctp_strreset_inreq);
+		}
+
+		if (param_len > SCTP_MAX_CHUNK_LEN -
+				sizeof(struct sctp_reconf_chunk))
+			goto out;
+	}
+
+	nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL);
+	if (!nstr_list) {
+		retval = -ENOMEM;
+		goto out;
+	}
+
+	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)) {
+		kfree(nstr_list);
+		retval = -EAGAIN;
+		goto out;
+	}
+
+	chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in);
+
+	kfree(nstr_list);
+
+	if (!chunk) {
+		retval = -ENOMEM;
+		goto out;
+	}
+
+	if (out) {
+		if (str_nums)
+			for (i = 0; i < str_nums; i++)
+				SCTP_SO(stream, str_list[i])->state =
+						       SCTP_STREAM_CLOSED;
+		else
+			for (i = 0; i < stream->outcnt; i++)
+				SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
+	}
+
+	asoc->strreset_chunk = chunk;
+	sctp_chunk_hold(asoc->strreset_chunk);
+
+	retval = sctp_send_reconf(asoc, chunk);
+	if (retval) {
+		sctp_chunk_put(asoc->strreset_chunk);
+		asoc->strreset_chunk = NULL;
+		if (!out)
+			goto out;
+
+		if (str_nums)
+			for (i = 0; i < str_nums; i++)
+				SCTP_SO(stream, str_list[i])->state =
+						       SCTP_STREAM_OPEN;
+		else
+			for (i = 0; i < stream->outcnt; i++)
+				SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
+
+		goto out;
+	}
+
+	asoc->strreset_outstanding = out + in;
+
+out:
+	return retval;
+}
+
+int sctp_send_reset_assoc(struct sctp_association *asoc)
+{
+	struct sctp_stream *stream = &asoc->stream;
+	struct sctp_chunk *chunk = NULL;
+	int retval;
+	__u16 i;
+
+	if (!asoc->peer.reconf_capable ||
+	    !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
+		return -ENOPROTOOPT;
+
+	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;
+
+	/* Block further xmit of data until this request is completed */
+	for (i = 0; i < stream->outcnt; i++)
+		SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
+
+	asoc->strreset_chunk = chunk;
+	sctp_chunk_hold(asoc->strreset_chunk);
+
+	retval = sctp_send_reconf(asoc, chunk);
+	if (retval) {
+		sctp_chunk_put(asoc->strreset_chunk);
+		asoc->strreset_chunk = NULL;
+
+		for (i = 0; i < stream->outcnt; i++)
+			SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
+
+		return retval;
+	}
+
+	asoc->strreset_outstanding = 1;
+
+	return 0;
+}
+
+int sctp_send_add_streams(struct sctp_association *asoc,
+			  struct sctp_add_streams *params)
+{
+	struct sctp_stream *stream = &asoc->stream;
+	struct sctp_chunk *chunk = NULL;
+	int retval;
+	__u32 outcnt, incnt;
+	__u16 out, in;
+
+	if (!asoc->peer.reconf_capable ||
+	    !(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
+		retval = -ENOPROTOOPT;
+		goto out;
+	}
+
+	if (asoc->strreset_outstanding) {
+		retval = -EINPROGRESS;
+		goto out;
+	}
+
+	out = params->sas_outstrms;
+	in  = params->sas_instrms;
+	outcnt = stream->outcnt + out;
+	incnt = stream->incnt + in;
+	if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM ||
+	    (!out && !in)) {
+		retval = -EINVAL;
+		goto out;
+	}
+
+	if (out) {
+		retval = sctp_stream_alloc_out(stream, outcnt, GFP_KERNEL);
+		if (retval)
+			goto out;
+	}
+
+	chunk = sctp_make_strreset_addstrm(asoc, out, in);
+	if (!chunk) {
+		retval = -ENOMEM;
+		goto out;
+	}
+
+	asoc->strreset_chunk = chunk;
+	sctp_chunk_hold(asoc->strreset_chunk);
+
+	retval = sctp_send_reconf(asoc, chunk);
+	if (retval) {
+		sctp_chunk_put(asoc->strreset_chunk);
+		asoc->strreset_chunk = NULL;
+		goto out;
+	}
+
+	stream->outcnt = outcnt;
+
+	asoc->strreset_outstanding = !!out + !!in;
+
+out:
+	return retval;
+}
+
+static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param(
+			struct sctp_association *asoc, __be32 resp_seq,
+			__be16 type)
+{
+	struct sctp_chunk *chunk = asoc->strreset_chunk;
+	struct sctp_reconf_chunk *hdr;
+	union sctp_params param;
+
+	if (!chunk)
+		return NULL;
+
+	hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
+	sctp_walk_params(param, hdr, params) {
+		/* sctp_strreset_tsnreq is actually the basic structure
+		 * of all stream reconf params, so it's safe to use it
+		 * to access request_seq.
+		 */
+		struct sctp_strreset_tsnreq *req = param.v;
+
+		if ((!resp_seq || req->request_seq == resp_seq) &&
+		    (!type || type == req->param_hdr.type))
+			return param.v;
+	}
+
+	return NULL;
+}
+
+static void sctp_update_strreset_result(struct sctp_association *asoc,
+					__u32 result)
+{
+	asoc->strreset_result[1] = asoc->strreset_result[0];
+	asoc->strreset_result[0] = result;
+}
+
+struct sctp_chunk *sctp_process_strreset_outreq(
+				struct sctp_association *asoc,
+				union sctp_params param,
+				struct sctp_ulpevent **evp)
+{
+	struct sctp_strreset_outreq *outreq = param.v;
+	struct sctp_stream *stream = &asoc->stream;
+	__u32 result = SCTP_STRRESET_DENIED;
+	__be16 *str_p = NULL;
+	__u32 request_seq;
+	__u16 i, nums;
+
+	request_seq = ntohl(outreq->request_seq);
+
+	if (ntohl(outreq->send_reset_at_tsn) >
+	    sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) {
+		result = SCTP_STRRESET_IN_PROGRESS;
+		goto err;
+	}
+
+	if (TSN_lt(asoc->strreset_inseq, request_seq) ||
+	    TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
+		result = SCTP_STRRESET_ERR_BAD_SEQNO;
+		goto err;
+	} else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
+		i = asoc->strreset_inseq - request_seq - 1;
+		result = asoc->strreset_result[i];
+		goto err;
+	}
+	asoc->strreset_inseq++;
+
+	/* Check strreset_enable after inseq inc, as sender cannot tell
+	 * the peer doesn't enable strreset after receiving response with
+	 * result denied, as well as to keep consistent with bsd.
+	 */
+	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,
+				SCTP_PARAM_RESET_IN_REQUEST)) {
+			/* same process with outstanding isn't 0 */
+			result = SCTP_STRRESET_ERR_IN_PROGRESS;
+			goto out;
+		}
+
+		asoc->strreset_outstanding--;
+		asoc->strreset_outseq++;
+
+		if (!asoc->strreset_outstanding) {
+			struct sctp_transport *t;
+
+			t = asoc->strreset_chunk->transport;
+			if (del_timer(&t->reconf_timer))
+				sctp_transport_put(t);
+
+			sctp_chunk_put(asoc->strreset_chunk);
+			asoc->strreset_chunk = NULL;
+		}
+	}
+
+	if (nums)
+		for (i = 0; i < nums; i++)
+			SCTP_SI(stream, ntohs(str_p[i]))->mid = 0;
+	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,
+		SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
+
+out:
+	sctp_update_strreset_result(asoc, result);
+err:
+	return sctp_make_strreset_resp(asoc, result, request_seq);
+}
+
+struct sctp_chunk *sctp_process_strreset_inreq(
+				struct sctp_association *asoc,
+				union sctp_params param,
+				struct sctp_ulpevent **evp)
+{
+	struct sctp_strreset_inreq *inreq = param.v;
+	struct sctp_stream *stream = &asoc->stream;
+	__u32 result = SCTP_STRRESET_DENIED;
+	struct sctp_chunk *chunk = NULL;
+	__u32 request_seq;
+	__u16 i, nums;
+	__be16 *str_p;
+
+	request_seq = ntohl(inreq->request_seq);
+	if (TSN_lt(asoc->strreset_inseq, request_seq) ||
+	    TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
+		result = SCTP_STRRESET_ERR_BAD_SEQNO;
+		goto err;
+	} else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
+		i = asoc->strreset_inseq - request_seq - 1;
+		result = asoc->strreset_result[i];
+		if (result == SCTP_STRRESET_PERFORMED)
+			return NULL;
+		goto err;
+	}
+	asoc->strreset_inseq++;
+
+	if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
+		goto out;
+
+	if (asoc->strreset_outstanding) {
+		result = SCTP_STRRESET_ERR_IN_PROGRESS;
+		goto out;
+	}
+
+	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) {
+			result = SCTP_STRRESET_ERR_WRONG_SSN;
+			goto out;
+		}
+	}
+
+	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;
+
+	if (nums)
+		for (i = 0; i < nums; i++)
+			SCTP_SO(stream, ntohs(str_p[i]))->state =
+					       SCTP_STREAM_CLOSED;
+	else
+		for (i = 0; i < stream->outcnt; i++)
+			SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
+
+	asoc->strreset_chunk = chunk;
+	asoc->strreset_outstanding = 1;
+	sctp_chunk_hold(asoc->strreset_chunk);
+
+	result = SCTP_STRRESET_PERFORMED;
+
+out:
+	sctp_update_strreset_result(asoc, result);
+err:
+	if (!chunk)
+		chunk =  sctp_make_strreset_resp(asoc, result, request_seq);
+
+	return chunk;
+}
+
+struct sctp_chunk *sctp_process_strreset_tsnreq(
+				struct sctp_association *asoc,
+				union sctp_params param,
+				struct sctp_ulpevent **evp)
+{
+	__u32 init_tsn = 0, next_tsn = 0, max_tsn_seen;
+	struct sctp_strreset_tsnreq *tsnreq = param.v;
+	struct sctp_stream *stream = &asoc->stream;
+	__u32 result = SCTP_STRRESET_DENIED;
+	__u32 request_seq;
+	__u16 i;
+
+	request_seq = ntohl(tsnreq->request_seq);
+	if (TSN_lt(asoc->strreset_inseq, request_seq) ||
+	    TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
+		result = SCTP_STRRESET_ERR_BAD_SEQNO;
+		goto err;
+	} else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
+		i = asoc->strreset_inseq - request_seq - 1;
+		result = asoc->strreset_result[i];
+		if (result == SCTP_STRRESET_PERFORMED) {
+			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))
+		goto out;
+
+	if (asoc->strreset_outstanding) {
+		result = SCTP_STRRESET_ERR_IN_PROGRESS;
+		goto out;
+	}
+
+	/* 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);
+	asoc->stream.si->report_ftsn(&asoc->ulpq, max_tsn_seen);
+
+	/* G1: Compute an appropriate value for the Receiver's Next TSN -- the
+	 *     TSN that the peer should use to send the next DATA chunk.  The
+	 *     value SHOULD be the smallest TSN not acknowledged by the
+	 *     receiver of the request plus 2^31.
+	 */
+	init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31);
+	sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
+			 init_tsn, GFP_ATOMIC);
+
+	/* 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);
+
+	/* G2: Compute an appropriate value for the local endpoint's next TSN,
+	 *     i.e., the next TSN assigned by the receiver of the SSN/TSN reset
+	 *     chunk.  The value SHOULD be the highest TSN sent by the receiver
+	 *     of the request plus 1.
+	 */
+	next_tsn = asoc->next_tsn;
+	asoc->ctsn_ack_point = next_tsn - 1;
+	asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
+
+	/* 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++) {
+		SCTP_SO(stream, i)->mid = 0;
+		SCTP_SO(stream, i)->mid_uo = 0;
+	}
+	for (i = 0; i < stream->incnt; i++)
+		SCTP_SI(stream, i)->mid = 0;
+
+	result = SCTP_STRRESET_PERFORMED;
+
+	*evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn,
+						    next_tsn, GFP_ATOMIC);
+
+out:
+	sctp_update_strreset_result(asoc, result);
+err:
+	return sctp_make_strreset_tsnresp(asoc, result, request_seq,
+					  next_tsn, init_tsn);
+}
+
+struct sctp_chunk *sctp_process_strreset_addstrm_out(
+				struct sctp_association *asoc,
+				union sctp_params param,
+				struct sctp_ulpevent **evp)
+{
+	struct sctp_strreset_addstrm *addstrm = param.v;
+	struct sctp_stream *stream = &asoc->stream;
+	__u32 result = SCTP_STRRESET_DENIED;
+	__u32 request_seq, incnt;
+	__u16 in, i;
+
+	request_seq = ntohl(addstrm->request_seq);
+	if (TSN_lt(asoc->strreset_inseq, request_seq) ||
+	    TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
+		result = SCTP_STRRESET_ERR_BAD_SEQNO;
+		goto err;
+	} else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
+		i = asoc->strreset_inseq - request_seq - 1;
+		result = asoc->strreset_result[i];
+		goto err;
+	}
+	asoc->strreset_inseq++;
+
+	if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
+		goto out;
+
+	in = ntohs(addstrm->number_of_streams);
+	incnt = stream->incnt + in;
+	if (!in || incnt > SCTP_MAX_STREAM)
+		goto out;
+
+	if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC))
+		goto out;
+
+	if (asoc->strreset_chunk) {
+		if (!sctp_chunk_lookup_strreset_param(
+			asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) {
+			/* same process with outstanding isn't 0 */
+			result = SCTP_STRRESET_ERR_IN_PROGRESS;
+			goto out;
+		}
+
+		asoc->strreset_outstanding--;
+		asoc->strreset_outseq++;
+
+		if (!asoc->strreset_outstanding) {
+			struct sctp_transport *t;
+
+			t = asoc->strreset_chunk->transport;
+			if (del_timer(&t->reconf_timer))
+				sctp_transport_put(t);
+
+			sctp_chunk_put(asoc->strreset_chunk);
+			asoc->strreset_chunk = NULL;
+		}
+	}
+
+	stream->incnt = incnt;
+
+	result = SCTP_STRRESET_PERFORMED;
+
+	*evp = sctp_ulpevent_make_stream_change_event(asoc,
+		0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC);
+
+out:
+	sctp_update_strreset_result(asoc, result);
+err:
+	return sctp_make_strreset_resp(asoc, result, request_seq);
+}
+
+struct sctp_chunk *sctp_process_strreset_addstrm_in(
+				struct sctp_association *asoc,
+				union sctp_params param,
+				struct sctp_ulpevent **evp)
+{
+	struct sctp_strreset_addstrm *addstrm = param.v;
+	struct sctp_stream *stream = &asoc->stream;
+	__u32 result = SCTP_STRRESET_DENIED;
+	struct sctp_chunk *chunk = NULL;
+	__u32 request_seq, outcnt;
+	__u16 out, i;
+	int ret;
+
+	request_seq = ntohl(addstrm->request_seq);
+	if (TSN_lt(asoc->strreset_inseq, request_seq) ||
+	    TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
+		result = SCTP_STRRESET_ERR_BAD_SEQNO;
+		goto err;
+	} else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
+		i = asoc->strreset_inseq - request_seq - 1;
+		result = asoc->strreset_result[i];
+		if (result == SCTP_STRRESET_PERFORMED)
+			return NULL;
+		goto err;
+	}
+	asoc->strreset_inseq++;
+
+	if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
+		goto out;
+
+	if (asoc->strreset_outstanding) {
+		result = SCTP_STRRESET_ERR_IN_PROGRESS;
+		goto out;
+	}
+
+	out = ntohs(addstrm->number_of_streams);
+	outcnt = stream->outcnt + out;
+	if (!out || outcnt > SCTP_MAX_STREAM)
+		goto out;
+
+	ret = sctp_stream_alloc_out(stream, outcnt, GFP_ATOMIC);
+	if (ret)
+		goto out;
+
+	chunk = sctp_make_strreset_addstrm(asoc, out, 0);
+	if (!chunk)
+		goto out;
+
+	asoc->strreset_chunk = chunk;
+	asoc->strreset_outstanding = 1;
+	sctp_chunk_hold(asoc->strreset_chunk);
+
+	stream->outcnt = outcnt;
+
+	result = SCTP_STRRESET_PERFORMED;
+
+out:
+	sctp_update_strreset_result(asoc, result);
+err:
+	if (!chunk)
+		chunk = sctp_make_strreset_resp(asoc, result, request_seq);
+
+	return chunk;
+}
+
+struct sctp_chunk *sctp_process_strreset_resp(
+				struct sctp_association *asoc,
+				union sctp_params param,
+				struct sctp_ulpevent **evp)
+{
+	struct sctp_stream *stream = &asoc->stream;
+	struct sctp_strreset_resp *resp = param.v;
+	struct sctp_transport *t;
+	__u16 i, nums, flags = 0;
+	struct sctp_paramhdr *req;
+	__u32 result;
+
+	req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0);
+	if (!req)
+		return NULL;
+
+	result = ntohl(resp->result);
+	if (result != SCTP_STRRESET_PERFORMED) {
+		/* if in progress, do nothing but retransmit */
+		if (result == SCTP_STRRESET_IN_PROGRESS)
+			return NULL;
+		else if (result == SCTP_STRRESET_DENIED)
+			flags = SCTP_STREAM_RESET_DENIED;
+		else
+			flags = SCTP_STREAM_RESET_FAILED;
+	}
+
+	if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) {
+		struct sctp_strreset_outreq *outreq;
+		__be16 *str_p;
+
+		outreq = (struct sctp_strreset_outreq *)req;
+		str_p = outreq->list_of_streams;
+		nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) /
+		       sizeof(__u16);
+
+		if (result == SCTP_STRRESET_PERFORMED) {
+			struct sctp_stream_out *sout;
+			if (nums) {
+				for (i = 0; i < nums; i++) {
+					sout = SCTP_SO(stream, ntohs(str_p[i]));
+					sout->mid = 0;
+					sout->mid_uo = 0;
+				}
+			} else {
+				for (i = 0; i < stream->outcnt; i++) {
+					sout = SCTP_SO(stream, i);
+					sout->mid = 0;
+					sout->mid_uo = 0;
+				}
+			}
+		}
+
+		flags |= SCTP_STREAM_RESET_OUTGOING_SSN;
+
+		for (i = 0; i < stream->outcnt; i++)
+			SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
+
+		*evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
+			nums, str_p, GFP_ATOMIC);
+	} else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) {
+		struct sctp_strreset_inreq *inreq;
+		__be16 *str_p;
+
+		/* if the result is performed, it's impossible for inreq */
+		if (result == SCTP_STRRESET_PERFORMED)
+			return NULL;
+
+		inreq = (struct sctp_strreset_inreq *)req;
+		str_p = inreq->list_of_streams;
+		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) {
+		struct sctp_strreset_resptsn *resptsn;
+		__u32 stsn, rtsn;
+
+		/* check for resptsn, as sctp_verify_reconf didn't do it*/
+		if (ntohs(param.p->length) != sizeof(*resptsn))
+			return NULL;
+
+		resptsn = (struct sctp_strreset_resptsn *)resp;
+		stsn = ntohl(resptsn->senders_next_tsn);
+		rtsn = ntohl(resptsn->receivers_next_tsn);
+
+		if (result == SCTP_STRRESET_PERFORMED) {
+			__u32 mtsn = sctp_tsnmap_get_max_tsn_seen(
+						&asoc->peer.tsn_map);
+			LIST_HEAD(temp);
+
+			asoc->stream.si->report_ftsn(&asoc->ulpq, mtsn);
+
+			sctp_tsnmap_init(&asoc->peer.tsn_map,
+					 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;
+			asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
+
+			for (i = 0; i < stream->outcnt; i++) {
+				SCTP_SO(stream, i)->mid = 0;
+				SCTP_SO(stream, i)->mid_uo = 0;
+			}
+			for (i = 0; i < stream->incnt; i++)
+				SCTP_SI(stream, i)->mid = 0;
+		}
+
+		for (i = 0; i < stream->outcnt; i++)
+			SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
+
+		*evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags,
+			stsn, rtsn, GFP_ATOMIC);
+	} else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) {
+		struct sctp_strreset_addstrm *addstrm;
+		__u16 number;
+
+		addstrm = (struct sctp_strreset_addstrm *)req;
+		nums = ntohs(addstrm->number_of_streams);
+		number = stream->outcnt - nums;
+
+		if (result == SCTP_STRRESET_PERFORMED) {
+			for (i = number; i < stream->outcnt; i++)
+				SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
+		} else {
+			sctp_stream_shrink_out(stream, number);
+			stream->outcnt = number;
+		}
+
+		*evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
+			0, nums, GFP_ATOMIC);
+	} else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) {
+		struct sctp_strreset_addstrm *addstrm;
+
+		/* if the result is performed, it's impossible for addstrm in
+		 * request.
+		 */
+		if (result == SCTP_STRRESET_PERFORMED)
+			return NULL;
+
+		addstrm = (struct sctp_strreset_addstrm *)req;
+		nums = ntohs(addstrm->number_of_streams);
+
+		*evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
+			nums, 0, GFP_ATOMIC);
+	}
+
+	asoc->strreset_outstanding--;
+	asoc->strreset_outseq++;
+
+	/* remove everything for this reconf request */
+	if (!asoc->strreset_outstanding) {
+		t = asoc->strreset_chunk->transport;
+		if (del_timer(&t->reconf_timer))
+			sctp_transport_put(t);
+
+		sctp_chunk_put(asoc->strreset_chunk);
+		asoc->strreset_chunk = NULL;
+	}
+
+	return NULL;
+}