[PATCHv2 net-next 0/5] sctp: add support for generating stream reconf chunks

[PATCHv2 net-next 0/5] sctp: add support for generating stream reconf chunks

[Xin Long]

This patchset is to add some functions to generate stream reconf chunks,
described in RFC6525 Section 3 and Section 4.

v1->v2:
  - put these into a smaller group.
  - rename some temporary variables in the codes.
  - rename the titles of the commits and improve some changelogs.

Xin Long (5):
  sctp: add a common helper function to generate stream reconf chunk
  sctp: add support for generating stream reconf ssn reset request chunk
  sctp: add support for generating stream reconf ssn/tsn reset request
    chunk
  sctp: add support for generating stream reconf response chunk
  sctp: add support for generating stream reconf add streams request
    chunk

 include/linux/sctp.h       |  68 ++++++++++++
 include/net/sctp/sm.h      |  17 ++-
 include/net/sctp/structs.h |   3 +
 net/sctp/associola.c       |   1 +
 net/sctp/sm_make_chunk.c   | 270 +++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 358 insertions(+), 1 deletion(-)

-- 
2.1.0

[PATCHv2 net-next 0/5] sctp: add support for generating stream reconf chunks

[Xin Long]

This patchset is to add some functions to generate stream reconf chunks,
described in RFC6525 Section 3 and Section 4.

v1->v2:
  - put these into a smaller group.
  - rename some temporary variables in the codes.
  - rename the titles of the commits and improve some changelogs.

Xin Long (5):
  sctp: add a common helper function to generate stream reconf chunk
  sctp: add support for generating stream reconf ssn reset request chunk
  sctp: add support for generating stream reconf ssn/tsn reset request
    chunk
  sctp: add support for generating stream reconf response chunk
  sctp: add support for generating stream reconf add streams request
    chunk

 include/linux/sctp.h       |  68 ++++++++++++
 include/net/sctp/sm.h      |  17 ++-
 include/net/sctp/structs.h |   3 +
 net/sctp/associola.c       |   1 +
 net/sctp/sm_make_chunk.c   | 270 +++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 358 insertions(+), 1 deletion(-)

-- 
2.1.0

[PATCHv2 net-next 1/5] sctp: add a common helper function to generate stream reconf chunk

[Xin Long]

This patch is to define a common api used to alloc memory and initialize
reconf chunk header that described in rfc6525 section 3.1.

All reconf chunks will be generated by calling this helper function.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
 include/linux/sctp.h     |  6 ++++++
 net/sctp/sm_make_chunk.c | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index fcb4c36..cdc3b05 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -108,6 +108,7 @@ typedef enum {
 	/* Use hex, as defined in ADDIP sec. 3.1 */
 	SCTP_CID_ASCONF			= 0xC1,
 	SCTP_CID_ASCONF_ACK		= 0x80,
+	SCTP_CID_RECONF			= 0x82,
 } sctp_cid_t; /* enum */
 
 
@@ -710,4 +711,9 @@ struct sctp_infox {
 	struct sctp_association *asoc;
 };
 
+struct sctp_reconf_chunk {
+	sctp_chunkhdr_t chunk_hdr;
+	__u8 params[0];
+} __packed;
+
 #endif /* __LINUX_SCTP_H__ */
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index a15d824..fd58097 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -3526,3 +3526,36 @@ struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
 
 	return retval;
 }
+
+/* RE-CONFIG 3.1 (RE-CONFIG chunk)
+ *   0                   1                   2                   3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  | Type = 130    |  Chunk Flags  |      Chunk Length             |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  \                                                               \
+ *  /                  Re-configuration Parameter                   /
+ *  \                                                               \
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  \                                                               \
+ *  /             Re-configuration Parameter (optional)             /
+ *  \                                                               \
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+static struct sctp_chunk *sctp_make_reconf(
+				const struct sctp_association *asoc,
+				int length)
+{
+	struct sctp_reconf_chunk *reconf;
+	struct sctp_chunk *retval;
+
+	retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length,
+				   GFP_ATOMIC);
+	if (!retval)
+		return NULL;
+
+	reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr;
+	retval->param_hdr.v = reconf->params;
+
+	return retval;
+}
-- 
2.1.0

[PATCHv2 net-next 1/5] sctp: add a common helper function to generate stream reconf chunk

[Xin Long]

This patch is to define a common api used to alloc memory and initialize
reconf chunk header that described in rfc6525 section 3.1.

All reconf chunks will be generated by calling this helper function.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
 include/linux/sctp.h     |  6 ++++++
 net/sctp/sm_make_chunk.c | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index fcb4c36..cdc3b05 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -108,6 +108,7 @@ typedef enum {
 	/* Use hex, as defined in ADDIP sec. 3.1 */
 	SCTP_CID_ASCONF			= 0xC1,
 	SCTP_CID_ASCONF_ACK		= 0x80,
+	SCTP_CID_RECONF			= 0x82,
 } sctp_cid_t; /* enum */
 
 
@@ -710,4 +711,9 @@ struct sctp_infox {
 	struct sctp_association *asoc;
 };
 
+struct sctp_reconf_chunk {
+	sctp_chunkhdr_t chunk_hdr;
+	__u8 params[0];
+} __packed;
+
 #endif /* __LINUX_SCTP_H__ */
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index a15d824..fd58097 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -3526,3 +3526,36 @@ struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
 
 	return retval;
 }
+
+/* RE-CONFIG 3.1 (RE-CONFIG chunk)
+ *   0                   1                   2                   3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  | Type = 130    |  Chunk Flags  |      Chunk Length             |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  \                                                               \
+ *  /                  Re-configuration Parameter                   /
+ *  \                                                               \
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  \                                                               \
+ *  /             Re-configuration Parameter (optional)             /
+ *  \                                                               \
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+static struct sctp_chunk *sctp_make_reconf(
+				const struct sctp_association *asoc,
+				int length)
+{
+	struct sctp_reconf_chunk *reconf;
+	struct sctp_chunk *retval;
+
+	retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length,
+				   GFP_ATOMIC);
+	if (!retval)
+		return NULL;
+
+	reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr;
+	retval->param_hdr.v = reconf->params;
+
+	return retval;
+}
-- 
2.1.0

[PATCHv2 net-next 2/5] sctp: add support for generating stream reconf ssn reset request chunk

[Xin Long]

This patch is to add asoc strreset_outseq and strreset_inseq for
saving the reconf request sequence, initialize them when create
assoc and process init, and also to define Incoming and Outgoing
SSN Reset Request Parameter described in rfc6525 section 4.1 and
4.2, As they can be in one same chunk as section rfc6525 3.1-3
describes, it makes them in one function.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
 include/linux/sctp.h       | 26 ++++++++++++++
 include/net/sctp/sm.h      |  5 ++-
 include/net/sctp/structs.h |  3 ++
 net/sctp/associola.c       |  1 +
 net/sctp/sm_make_chunk.c   | 88 ++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 122 insertions(+), 1 deletion(-)

diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index cdc3b05..d5da19c 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -200,6 +200,13 @@ typedef enum {
 	SCTP_PARAM_SUCCESS_REPORT	= cpu_to_be16(0xc005),
 	SCTP_PARAM_ADAPTATION_LAYER_IND = cpu_to_be16(0xc006),
 
+	/* RE-CONFIG. Section 4 */
+	SCTP_PARAM_RESET_OUT_REQUEST		= cpu_to_be16(0x000d),
+	SCTP_PARAM_RESET_IN_REQUEST		= cpu_to_be16(0x000e),
+	SCTP_PARAM_RESET_TSN_REQUEST		= cpu_to_be16(0x000f),
+	SCTP_PARAM_RESET_RESPONSE		= cpu_to_be16(0x0010),
+	SCTP_PARAM_RESET_ADD_OUT_STREAMS	= cpu_to_be16(0x0011),
+	SCTP_PARAM_RESET_ADD_IN_STREAMS		= cpu_to_be16(0x0012),
 } sctp_param_t; /* enum */
 
 
@@ -716,4 +723,23 @@ struct sctp_reconf_chunk {
 	__u8 params[0];
 } __packed;
 
+struct sctp_strreset_req {
+	sctp_paramhdr_t param_hdr;
+	__u32 request_seq;
+} __packed;
+
+struct sctp_strreset_outreq {
+	sctp_paramhdr_t param_hdr;
+	__u32 request_seq;
+	__u32 response_seq;
+	__u32 send_reset_at_tsn;
+	__u16 list_of_streams[0];
+} __packed;
+
+struct sctp_strreset_inreq {
+	sctp_paramhdr_t param_hdr;
+	__u32 request_seq;
+	__u16 list_of_streams[0];
+} __packed;
+
 #endif /* __LINUX_SCTP_H__ */
diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index ca6c971..3462cb0 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -259,7 +259,10 @@ struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
 				    __u32 new_cum_tsn, size_t nstreams,
 				    struct sctp_fwdtsn_skip *skiplist);
 struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc);
-
+struct sctp_chunk *sctp_make_strreset_req(
+				const struct sctp_association *asoc,
+				__u16 stream_num, __u16 *stream_list,
+				bool out, bool in);
 void sctp_chunk_assign_tsn(struct sctp_chunk *);
 void sctp_chunk_assign_ssn(struct sctp_chunk *);
 
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 4741ec2..3dc983e 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1865,6 +1865,9 @@ struct sctp_association {
 	     temp:1,		/* Is it a temporary association? */
 	     prsctp_enable:1;
 
+	__u32 strreset_outseq; /* Update after receiving response */
+	__u32 strreset_inseq; /* Update after receiving request */
+
 	struct sctp_priv_assoc_stats stats;
 
 	int sent_cnt_removable;
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 36294f7..42ece6f 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -207,6 +207,7 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a
 	 * association to the same value as the initial TSN.
 	 */
 	asoc->addip_serial = asoc->c.initial_tsn;
+	asoc->strreset_outseq = asoc->c.initial_tsn;
 
 	INIT_LIST_HEAD(&asoc->addip_chunk_list);
 	INIT_LIST_HEAD(&asoc->asconf_ack_list);
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index fd58097..172385c 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -1844,6 +1844,7 @@ struct sctp_association *sctp_unpack_cookie(
 	retval->next_tsn = retval->c.initial_tsn;
 	retval->ctsn_ack_point = retval->next_tsn - 1;
 	retval->addip_serial = retval->c.initial_tsn;
+	retval->strreset_outseq = retval->c.initial_tsn;
 	retval->adv_peer_ack_point = retval->ctsn_ack_point;
 	retval->peer.prsctp_capable = retval->c.prsctp_capable;
 	retval->peer.adaptation_ind = retval->c.adaptation_ind;
@@ -2387,6 +2388,8 @@ int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
 	asoc->peer.i.initial_tsn =
 		ntohl(peer_init->init_hdr.initial_tsn);
 
+	asoc->strreset_inseq = asoc->peer.i.initial_tsn;
+
 	/* Apply the upper bounds for output streams based on peer's
 	 * number of inbound streams.
 	 */
@@ -3559,3 +3562,88 @@ static struct sctp_chunk *sctp_make_reconf(
 
 	return retval;
 }
+
+/* RE-CONFIG 4.1 (STREAM OUT RESET)
+ *   0                   1                   2                   3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |     Parameter Type = 13       | Parameter Length = 16 + 2 * N |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |           Re-configuration Request Sequence Number            |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |           Re-configuration Response Sequence Number           |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |                Sender's Last Assigned TSN                     |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |  Stream Number 1 (optional)   |    Stream Number 2 (optional) |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  /                            ......                             /
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |  Stream Number N-1 (optional) |    Stream Number N (optional) |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * RE-CONFIG 4.2 (STREAM IN RESET)
+ *   0                   1                   2                   3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |     Parameter Type = 14       |  Parameter Length = 8 + 2 * N |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |          Re-configuration Request Sequence Number             |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |  Stream Number 1 (optional)   |    Stream Number 2 (optional) |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  /                            ......                             /
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |  Stream Number N-1 (optional) |    Stream Number N (optional) |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct sctp_chunk *sctp_make_strreset_req(
+				const struct sctp_association *asoc,
+				__u16 stream_num, __u16 *stream_list,
+				bool out, bool in)
+{
+	struct sctp_strreset_outreq outreq;
+	__u16 stream_len = stream_num * 2;
+	struct sctp_strreset_inreq inreq;
+	struct sctp_chunk *retval;
+	__u16 outlen, inlen, i;
+
+	outlen = (sizeof(outreq) + stream_len) * out;
+	inlen = (sizeof(inreq) + stream_len) * in;
+
+	retval = sctp_make_reconf(asoc, outlen + inlen);
+	if (!retval)
+		return NULL;
+
+	for (i = 0; i < stream_num; i++)
+		stream_list[i] = htons(stream_list[i]);
+
+	if (outlen) {
+		outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST;
+		outreq.param_hdr.length = htons(outlen);
+		outreq.request_seq = htonl(asoc->strreset_outseq);
+		outreq.response_seq = htonl(asoc->strreset_inseq - 1);
+		outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1);
+
+		sctp_addto_chunk(retval, sizeof(outreq), &outreq);
+
+		if (stream_len)
+			sctp_addto_chunk(retval, stream_len, stream_list);
+	}
+
+	if (inlen) {
+		inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST;
+		inreq.param_hdr.length = htons(inlen);
+		inreq.request_seq = htonl(asoc->strreset_outseq + out);
+
+		sctp_addto_chunk(retval, sizeof(inreq), &inreq);
+
+		if (stream_len)
+			sctp_addto_chunk(retval, stream_len, stream_list);
+	}
+
+	for (i = 0; i < stream_num; i++)
+		stream_list[i] = ntohs(stream_list[i]);
+
+	return retval;
+}
-- 
2.1.0

[PATCHv2 net-next 2/5] sctp: add support for generating stream reconf ssn reset request chunk

[Xin Long]

This patch is to add asoc strreset_outseq and strreset_inseq for
saving the reconf request sequence, initialize them when create
assoc and process init, and also to define Incoming and Outgoing
SSN Reset Request Parameter described in rfc6525 section 4.1 and
4.2, As they can be in one same chunk as section rfc6525 3.1-3
describes, it makes them in one function.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
 include/linux/sctp.h       | 26 ++++++++++++++
 include/net/sctp/sm.h      |  5 ++-
 include/net/sctp/structs.h |  3 ++
 net/sctp/associola.c       |  1 +
 net/sctp/sm_make_chunk.c   | 88 ++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 122 insertions(+), 1 deletion(-)

diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index cdc3b05..d5da19c 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -200,6 +200,13 @@ typedef enum {
 	SCTP_PARAM_SUCCESS_REPORT	= cpu_to_be16(0xc005),
 	SCTP_PARAM_ADAPTATION_LAYER_IND = cpu_to_be16(0xc006),
 
+	/* RE-CONFIG. Section 4 */
+	SCTP_PARAM_RESET_OUT_REQUEST		= cpu_to_be16(0x000d),
+	SCTP_PARAM_RESET_IN_REQUEST		= cpu_to_be16(0x000e),
+	SCTP_PARAM_RESET_TSN_REQUEST		= cpu_to_be16(0x000f),
+	SCTP_PARAM_RESET_RESPONSE		= cpu_to_be16(0x0010),
+	SCTP_PARAM_RESET_ADD_OUT_STREAMS	= cpu_to_be16(0x0011),
+	SCTP_PARAM_RESET_ADD_IN_STREAMS		= cpu_to_be16(0x0012),
 } sctp_param_t; /* enum */
 
 
@@ -716,4 +723,23 @@ struct sctp_reconf_chunk {
 	__u8 params[0];
 } __packed;
 
+struct sctp_strreset_req {
+	sctp_paramhdr_t param_hdr;
+	__u32 request_seq;
+} __packed;
+
+struct sctp_strreset_outreq {
+	sctp_paramhdr_t param_hdr;
+	__u32 request_seq;
+	__u32 response_seq;
+	__u32 send_reset_at_tsn;
+	__u16 list_of_streams[0];
+} __packed;
+
+struct sctp_strreset_inreq {
+	sctp_paramhdr_t param_hdr;
+	__u32 request_seq;
+	__u16 list_of_streams[0];
+} __packed;
+
 #endif /* __LINUX_SCTP_H__ */
diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index ca6c971..3462cb0 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -259,7 +259,10 @@ struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
 				    __u32 new_cum_tsn, size_t nstreams,
 				    struct sctp_fwdtsn_skip *skiplist);
 struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc);
-
+struct sctp_chunk *sctp_make_strreset_req(
+				const struct sctp_association *asoc,
+				__u16 stream_num, __u16 *stream_list,
+				bool out, bool in);
 void sctp_chunk_assign_tsn(struct sctp_chunk *);
 void sctp_chunk_assign_ssn(struct sctp_chunk *);
 
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 4741ec2..3dc983e 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1865,6 +1865,9 @@ struct sctp_association {
 	     temp:1,		/* Is it a temporary association? */
 	     prsctp_enable:1;
 
+	__u32 strreset_outseq; /* Update after receiving response */
+	__u32 strreset_inseq; /* Update after receiving request */
+
 	struct sctp_priv_assoc_stats stats;
 
 	int sent_cnt_removable;
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 36294f7..42ece6f 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -207,6 +207,7 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a
 	 * association to the same value as the initial TSN.
 	 */
 	asoc->addip_serial = asoc->c.initial_tsn;
+	asoc->strreset_outseq = asoc->c.initial_tsn;
 
 	INIT_LIST_HEAD(&asoc->addip_chunk_list);
 	INIT_LIST_HEAD(&asoc->asconf_ack_list);
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index fd58097..172385c 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -1844,6 +1844,7 @@ struct sctp_association *sctp_unpack_cookie(
 	retval->next_tsn = retval->c.initial_tsn;
 	retval->ctsn_ack_point = retval->next_tsn - 1;
 	retval->addip_serial = retval->c.initial_tsn;
+	retval->strreset_outseq = retval->c.initial_tsn;
 	retval->adv_peer_ack_point = retval->ctsn_ack_point;
 	retval->peer.prsctp_capable = retval->c.prsctp_capable;
 	retval->peer.adaptation_ind = retval->c.adaptation_ind;
@@ -2387,6 +2388,8 @@ int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
 	asoc->peer.i.initial_tsn  		ntohl(peer_init->init_hdr.initial_tsn);
 
+	asoc->strreset_inseq = asoc->peer.i.initial_tsn;
+
 	/* Apply the upper bounds for output streams based on peer's
 	 * number of inbound streams.
 	 */
@@ -3559,3 +3562,88 @@ static struct sctp_chunk *sctp_make_reconf(
 
 	return retval;
 }
+
+/* RE-CONFIG 4.1 (STREAM OUT RESET)
+ *   0                   1                   2                   3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |     Parameter Type = 13       | Parameter Length = 16 + 2 * N |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |           Re-configuration Request Sequence Number            |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |           Re-configuration Response Sequence Number           |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |                Sender's Last Assigned TSN                     |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |  Stream Number 1 (optional)   |    Stream Number 2 (optional) |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  /                            ......                             /
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |  Stream Number N-1 (optional) |    Stream Number N (optional) |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * RE-CONFIG 4.2 (STREAM IN RESET)
+ *   0                   1                   2                   3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |     Parameter Type = 14       |  Parameter Length = 8 + 2 * N |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |          Re-configuration Request Sequence Number             |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |  Stream Number 1 (optional)   |    Stream Number 2 (optional) |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  /                            ......                             /
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |  Stream Number N-1 (optional) |    Stream Number N (optional) |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct sctp_chunk *sctp_make_strreset_req(
+				const struct sctp_association *asoc,
+				__u16 stream_num, __u16 *stream_list,
+				bool out, bool in)
+{
+	struct sctp_strreset_outreq outreq;
+	__u16 stream_len = stream_num * 2;
+	struct sctp_strreset_inreq inreq;
+	struct sctp_chunk *retval;
+	__u16 outlen, inlen, i;
+
+	outlen = (sizeof(outreq) + stream_len) * out;
+	inlen = (sizeof(inreq) + stream_len) * in;
+
+	retval = sctp_make_reconf(asoc, outlen + inlen);
+	if (!retval)
+		return NULL;
+
+	for (i = 0; i < stream_num; i++)
+		stream_list[i] = htons(stream_list[i]);
+
+	if (outlen) {
+		outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST;
+		outreq.param_hdr.length = htons(outlen);
+		outreq.request_seq = htonl(asoc->strreset_outseq);
+		outreq.response_seq = htonl(asoc->strreset_inseq - 1);
+		outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1);
+
+		sctp_addto_chunk(retval, sizeof(outreq), &outreq);
+
+		if (stream_len)
+			sctp_addto_chunk(retval, stream_len, stream_list);
+	}
+
+	if (inlen) {
+		inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST;
+		inreq.param_hdr.length = htons(inlen);
+		inreq.request_seq = htonl(asoc->strreset_outseq + out);
+
+		sctp_addto_chunk(retval, sizeof(inreq), &inreq);
+
+		if (stream_len)
+			sctp_addto_chunk(retval, stream_len, stream_list);
+	}
+
+	for (i = 0; i < stream_num; i++)
+		stream_list[i] = ntohs(stream_list[i]);
+
+	return retval;
+}
-- 
2.1.0

[PATCHv2 net-next 3/5] sctp: add support for generating stream reconf ssn/tsn reset request chunk

[Xin Long]

This patch is to define SSN/TSN Reset Request Parameter described
in rfc6525 section 4.3.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
 include/linux/sctp.h     |  5 +++++
 include/net/sctp/sm.h    |  2 ++
 net/sctp/sm_make_chunk.c | 29 +++++++++++++++++++++++++++++
 3 files changed, 36 insertions(+)

diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index d5da19c..cc4c74d 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -742,4 +742,9 @@ struct sctp_strreset_inreq {
 	__u16 list_of_streams[0];
 } __packed;
 
+struct sctp_strreset_tsnreq {
+	sctp_paramhdr_t param_hdr;
+	__u32 request_seq;
+} __packed;
+
 #endif /* __LINUX_SCTP_H__ */
diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index 3462cb0..c658700 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -263,6 +263,8 @@ struct sctp_chunk *sctp_make_strreset_req(
 				const struct sctp_association *asoc,
 				__u16 stream_num, __u16 *stream_list,
 				bool out, bool in);
+struct sctp_chunk *sctp_make_strreset_tsnreq(
+				const struct sctp_association *asoc);
 void sctp_chunk_assign_tsn(struct sctp_chunk *);
 void sctp_chunk_assign_ssn(struct sctp_chunk *);
 
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 172385c..f1d8f07 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -3647,3 +3647,32 @@ struct sctp_chunk *sctp_make_strreset_req(
 
 	return retval;
 }
+
+/* RE-CONFIG 4.3 (SSN/TSN RESET ALL)
+ *   0                   1                   2                   3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |     Parameter Type = 15       |      Parameter Length = 8     |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |         Re-configuration Request Sequence Number              |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct sctp_chunk *sctp_make_strreset_tsnreq(
+				const struct sctp_association *asoc)
+{
+	struct sctp_strreset_tsnreq tsnreq;
+	__u16 length = sizeof(tsnreq);
+	struct sctp_chunk *retval;
+
+	retval = sctp_make_reconf(asoc, length);
+	if (!retval)
+		return NULL;
+
+	tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST;
+	tsnreq.param_hdr.length = htons(length);
+	tsnreq.request_seq = htonl(asoc->strreset_outseq);
+
+	sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq);
+
+	return retval;
+}
-- 
2.1.0

[PATCHv2 net-next 3/5] sctp: add support for generating stream reconf ssn/tsn reset request chunk

[Xin Long]

This patch is to define SSN/TSN Reset Request Parameter described
in rfc6525 section 4.3.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
 include/linux/sctp.h     |  5 +++++
 include/net/sctp/sm.h    |  2 ++
 net/sctp/sm_make_chunk.c | 29 +++++++++++++++++++++++++++++
 3 files changed, 36 insertions(+)

diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index d5da19c..cc4c74d 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -742,4 +742,9 @@ struct sctp_strreset_inreq {
 	__u16 list_of_streams[0];
 } __packed;
 
+struct sctp_strreset_tsnreq {
+	sctp_paramhdr_t param_hdr;
+	__u32 request_seq;
+} __packed;
+
 #endif /* __LINUX_SCTP_H__ */
diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index 3462cb0..c658700 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -263,6 +263,8 @@ struct sctp_chunk *sctp_make_strreset_req(
 				const struct sctp_association *asoc,
 				__u16 stream_num, __u16 *stream_list,
 				bool out, bool in);
+struct sctp_chunk *sctp_make_strreset_tsnreq(
+				const struct sctp_association *asoc);
 void sctp_chunk_assign_tsn(struct sctp_chunk *);
 void sctp_chunk_assign_ssn(struct sctp_chunk *);
 
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 172385c..f1d8f07 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -3647,3 +3647,32 @@ struct sctp_chunk *sctp_make_strreset_req(
 
 	return retval;
 }
+
+/* RE-CONFIG 4.3 (SSN/TSN RESET ALL)
+ *   0                   1                   2                   3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |     Parameter Type = 15       |      Parameter Length = 8     |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |         Re-configuration Request Sequence Number              |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct sctp_chunk *sctp_make_strreset_tsnreq(
+				const struct sctp_association *asoc)
+{
+	struct sctp_strreset_tsnreq tsnreq;
+	__u16 length = sizeof(tsnreq);
+	struct sctp_chunk *retval;
+
+	retval = sctp_make_reconf(asoc, length);
+	if (!retval)
+		return NULL;
+
+	tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST;
+	tsnreq.param_hdr.length = htons(length);
+	tsnreq.request_seq = htonl(asoc->strreset_outseq);
+
+	sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq);
+
+	return retval;
+}
-- 
2.1.0

[PATCHv2 net-next 4/5] sctp: add support for generating stream reconf response chunk

[Xin Long]

This patch is to define Re-configuration Response Parameter described
in rfc6525 section 4.4. As optional fields are only for SSN/TSN Reset
Request Parameter, it uses another function to make that.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
 include/linux/sctp.h     | 24 ++++++++++++++++
 include/net/sctp/sm.h    |  7 +++++
 net/sctp/sm_make_chunk.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 105 insertions(+)

diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index cc4c74d..c4fcc7d 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -747,4 +747,28 @@ struct sctp_strreset_tsnreq {
 	__u32 request_seq;
 } __packed;
 
+enum {
+	SCTP_STRRESET_NOTHING_TO_DO	= 0x00,
+	SCTP_STRRESET_PERFORMED		= 0x01,
+	SCTP_STRRESET_DENIED		= 0x02,
+	SCTP_STRRESET_ERR_WRONG_SSN	= 0x03,
+	SCTP_STRRESET_ERR_IN_PROGRESS	= 0x04,
+	SCTP_STRRESET_ERR_BAD_SEQNO	= 0x05,
+	SCTP_STRRESET_IN_PROGRESS	= 0x06,
+};
+
+struct sctp_strreset_resp {
+	sctp_paramhdr_t param_hdr;
+	__u32 response_seq;
+	__u32 result;
+} __packed;
+
+struct sctp_strreset_resptsn {
+	sctp_paramhdr_t param_hdr;
+	__u32 response_seq;
+	__u32 result;
+	__u32 senders_next_tsn;
+	__u32 receivers_next_tsn;
+} __packed;
+
 #endif /* __LINUX_SCTP_H__ */
diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index c658700..013d69f 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -265,6 +265,13 @@ struct sctp_chunk *sctp_make_strreset_req(
 				bool out, bool in);
 struct sctp_chunk *sctp_make_strreset_tsnreq(
 				const struct sctp_association *asoc);
+struct sctp_chunk *sctp_make_strreset_resp(
+				const struct sctp_association *asoc,
+				__u32 result, __u32 sn);
+struct sctp_chunk *sctp_make_strreset_tsnresp(
+				struct sctp_association *asoc,
+				__u32 result, __u32 sn,
+				__u32 sender_tsn, __u32 receiver_tsn);
 void sctp_chunk_assign_tsn(struct sctp_chunk *);
 void sctp_chunk_assign_ssn(struct sctp_chunk *);
 
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index f1d8f07..34edb30 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -3676,3 +3676,77 @@ struct sctp_chunk *sctp_make_strreset_tsnreq(
 
 	return retval;
 }
+
+/* RE-CONFIG 4.4 (RESP)
+ *   0                   1                   2                   3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |     Parameter Type = 16       |      Parameter Length         |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |         Re-configuration Response Sequence Number             |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |                            Result                             |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct sctp_chunk *sctp_make_strreset_resp(
+				const struct sctp_association *asoc,
+				__u32 result, __u32 sn)
+{
+	struct sctp_strreset_resp resp;
+	__u16 length = sizeof(resp);
+	struct sctp_chunk *retval;
+
+	retval = sctp_make_reconf(asoc, length);
+	if (!retval)
+		return NULL;
+
+	resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
+	resp.param_hdr.length = htons(length);
+	resp.response_seq = htonl(sn);
+	resp.result = htonl(result);
+
+	sctp_addto_chunk(retval, sizeof(resp), &resp);
+
+	return retval;
+}
+
+/* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
+ *   0                   1                   2                   3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |     Parameter Type = 16       |      Parameter Length         |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |         Re-configuration Response Sequence Number             |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |                            Result                             |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |                   Sender's Next TSN (optional)                |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |                  Receiver's Next TSN (optional)               |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct sctp_chunk *sctp_make_strreset_tsnresp(
+					struct sctp_association *asoc,
+					__u32 result, __u32 sn,
+					__u32 sender_tsn, __u32 receiver_tsn)
+{
+	struct sctp_strreset_resptsn tsnresp;
+	__u16 length = sizeof(tsnresp);
+	struct sctp_chunk *retval;
+
+	retval = sctp_make_reconf(asoc, length);
+	if (!retval)
+		return NULL;
+
+	tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
+	tsnresp.param_hdr.length = htons(length);
+
+	tsnresp.response_seq = htonl(sn);
+	tsnresp.result = htonl(result);
+	tsnresp.senders_next_tsn = htonl(sender_tsn);
+	tsnresp.receivers_next_tsn = htonl(receiver_tsn);
+
+	sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp);
+
+	return retval;
+}
-- 
2.1.0

[PATCHv2 net-next 4/5] sctp: add support for generating stream reconf response chunk

[Xin Long]

This patch is to define Re-configuration Response Parameter described
in rfc6525 section 4.4. As optional fields are only for SSN/TSN Reset
Request Parameter, it uses another function to make that.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
 include/linux/sctp.h     | 24 ++++++++++++++++
 include/net/sctp/sm.h    |  7 +++++
 net/sctp/sm_make_chunk.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 105 insertions(+)

diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index cc4c74d..c4fcc7d 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -747,4 +747,28 @@ struct sctp_strreset_tsnreq {
 	__u32 request_seq;
 } __packed;
 
+enum {
+	SCTP_STRRESET_NOTHING_TO_DO	= 0x00,
+	SCTP_STRRESET_PERFORMED		= 0x01,
+	SCTP_STRRESET_DENIED		= 0x02,
+	SCTP_STRRESET_ERR_WRONG_SSN	= 0x03,
+	SCTP_STRRESET_ERR_IN_PROGRESS	= 0x04,
+	SCTP_STRRESET_ERR_BAD_SEQNO	= 0x05,
+	SCTP_STRRESET_IN_PROGRESS	= 0x06,
+};
+
+struct sctp_strreset_resp {
+	sctp_paramhdr_t param_hdr;
+	__u32 response_seq;
+	__u32 result;
+} __packed;
+
+struct sctp_strreset_resptsn {
+	sctp_paramhdr_t param_hdr;
+	__u32 response_seq;
+	__u32 result;
+	__u32 senders_next_tsn;
+	__u32 receivers_next_tsn;
+} __packed;
+
 #endif /* __LINUX_SCTP_H__ */
diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index c658700..013d69f 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -265,6 +265,13 @@ struct sctp_chunk *sctp_make_strreset_req(
 				bool out, bool in);
 struct sctp_chunk *sctp_make_strreset_tsnreq(
 				const struct sctp_association *asoc);
+struct sctp_chunk *sctp_make_strreset_resp(
+				const struct sctp_association *asoc,
+				__u32 result, __u32 sn);
+struct sctp_chunk *sctp_make_strreset_tsnresp(
+				struct sctp_association *asoc,
+				__u32 result, __u32 sn,
+				__u32 sender_tsn, __u32 receiver_tsn);
 void sctp_chunk_assign_tsn(struct sctp_chunk *);
 void sctp_chunk_assign_ssn(struct sctp_chunk *);
 
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index f1d8f07..34edb30 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -3676,3 +3676,77 @@ struct sctp_chunk *sctp_make_strreset_tsnreq(
 
 	return retval;
 }
+
+/* RE-CONFIG 4.4 (RESP)
+ *   0                   1                   2                   3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |     Parameter Type = 16       |      Parameter Length         |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |         Re-configuration Response Sequence Number             |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |                            Result                             |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct sctp_chunk *sctp_make_strreset_resp(
+				const struct sctp_association *asoc,
+				__u32 result, __u32 sn)
+{
+	struct sctp_strreset_resp resp;
+	__u16 length = sizeof(resp);
+	struct sctp_chunk *retval;
+
+	retval = sctp_make_reconf(asoc, length);
+	if (!retval)
+		return NULL;
+
+	resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
+	resp.param_hdr.length = htons(length);
+	resp.response_seq = htonl(sn);
+	resp.result = htonl(result);
+
+	sctp_addto_chunk(retval, sizeof(resp), &resp);
+
+	return retval;
+}
+
+/* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
+ *   0                   1                   2                   3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |     Parameter Type = 16       |      Parameter Length         |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |         Re-configuration Response Sequence Number             |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |                            Result                             |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |                   Sender's Next TSN (optional)                |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |                  Receiver's Next TSN (optional)               |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct sctp_chunk *sctp_make_strreset_tsnresp(
+					struct sctp_association *asoc,
+					__u32 result, __u32 sn,
+					__u32 sender_tsn, __u32 receiver_tsn)
+{
+	struct sctp_strreset_resptsn tsnresp;
+	__u16 length = sizeof(tsnresp);
+	struct sctp_chunk *retval;
+
+	retval = sctp_make_reconf(asoc, length);
+	if (!retval)
+		return NULL;
+
+	tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
+	tsnresp.param_hdr.length = htons(length);
+
+	tsnresp.response_seq = htonl(sn);
+	tsnresp.result = htonl(result);
+	tsnresp.senders_next_tsn = htonl(sender_tsn);
+	tsnresp.receivers_next_tsn = htonl(receiver_tsn);
+
+	sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp);
+
+	return retval;
+}
-- 
2.1.0

[PATCHv2 net-next 5/5] sctp: add support for generating stream reconf add streams request chunk

[Xin Long]

This patch is to define Add Incoming/Outgoing Streams Request
Parameter described in rfc6525 section 4.5 and 4.6. They can
be in one same chunk trunk as rfc6525 section 3.1-7 describes,
so make them in one function.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
 include/linux/sctp.h     |  7 +++++++
 include/net/sctp/sm.h    |  3 +++
 net/sctp/sm_make_chunk.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+)

diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index c4fcc7d..3a9f234 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -771,4 +771,11 @@ struct sctp_strreset_resptsn {
 	__u32 receivers_next_tsn;
 } __packed;
 
+struct sctp_strreset_addstrm {
+	sctp_paramhdr_t param_hdr;
+	__u32 request_seq;
+	__u16 number_of_streams;
+	__u16 reserved;
+} __packed;
+
 #endif /* __LINUX_SCTP_H__ */
diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index 013d69f..35986d0 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -272,6 +272,9 @@ struct sctp_chunk *sctp_make_strreset_tsnresp(
 				struct sctp_association *asoc,
 				__u32 result, __u32 sn,
 				__u32 sender_tsn, __u32 receiver_tsn);
+struct sctp_chunk *sctp_make_strreset_addstrm(
+				const struct sctp_association *asoc,
+				__u16 out, __u16 in);
 void sctp_chunk_assign_tsn(struct sctp_chunk *);
 void sctp_chunk_assign_ssn(struct sctp_chunk *);
 
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 34edb30..e6a5530 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -3750,3 +3750,49 @@ struct sctp_chunk *sctp_make_strreset_tsnresp(
 
 	return retval;
 }
+
+/* RE-CONFIG 4.5/4.6 (ADD STREAM)
+ *   0                   1                   2                   3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |     Parameter Type = 17       |      Parameter Length = 12    |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |          Re-configuration Request Sequence Number             |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |      Number of new streams    |         Reserved              |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct sctp_chunk *sctp_make_strreset_addstrm(
+				const struct sctp_association *asoc,
+				__u16 out, __u16 in)
+{
+	struct sctp_strreset_addstrm addstrm;
+	__u16 length = sizeof(addstrm);
+	struct sctp_chunk *retval;
+
+	retval = sctp_make_reconf(asoc, (!!out + !!in) * length);
+	if (!retval)
+		return NULL;
+
+	if (out) {
+		addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS;
+		addstrm.param_hdr.length = htons(length);
+		addstrm.number_of_streams = htons(out);
+		addstrm.request_seq = htonl(asoc->strreset_outseq);
+		addstrm.reserved = 0;
+
+		sctp_addto_chunk(retval, length, &addstrm);
+	}
+
+	if (in) {
+		addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS;
+		addstrm.param_hdr.length = htons(length);
+		addstrm.number_of_streams = htons(in);
+		addstrm.request_seq = htonl(asoc->strreset_outseq + !!out);
+		addstrm.reserved = 0;
+
+		sctp_addto_chunk(retval, length, &addstrm);
+	}
+
+	return retval;
+}
-- 
2.1.0

[PATCHv2 net-next 5/5] sctp: add support for generating stream reconf add streams request chunk

[Xin Long]

This patch is to define Add Incoming/Outgoing Streams Request
Parameter described in rfc6525 section 4.5 and 4.6. They can
be in one same chunk trunk as rfc6525 section 3.1-7 describes,
so make them in one function.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
 include/linux/sctp.h     |  7 +++++++
 include/net/sctp/sm.h    |  3 +++
 net/sctp/sm_make_chunk.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+)

diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index c4fcc7d..3a9f234 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -771,4 +771,11 @@ struct sctp_strreset_resptsn {
 	__u32 receivers_next_tsn;
 } __packed;
 
+struct sctp_strreset_addstrm {
+	sctp_paramhdr_t param_hdr;
+	__u32 request_seq;
+	__u16 number_of_streams;
+	__u16 reserved;
+} __packed;
+
 #endif /* __LINUX_SCTP_H__ */
diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index 013d69f..35986d0 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -272,6 +272,9 @@ struct sctp_chunk *sctp_make_strreset_tsnresp(
 				struct sctp_association *asoc,
 				__u32 result, __u32 sn,
 				__u32 sender_tsn, __u32 receiver_tsn);
+struct sctp_chunk *sctp_make_strreset_addstrm(
+				const struct sctp_association *asoc,
+				__u16 out, __u16 in);
 void sctp_chunk_assign_tsn(struct sctp_chunk *);
 void sctp_chunk_assign_ssn(struct sctp_chunk *);
 
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 34edb30..e6a5530 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -3750,3 +3750,49 @@ struct sctp_chunk *sctp_make_strreset_tsnresp(
 
 	return retval;
 }
+
+/* RE-CONFIG 4.5/4.6 (ADD STREAM)
+ *   0                   1                   2                   3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |     Parameter Type = 17       |      Parameter Length = 12    |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |          Re-configuration Request Sequence Number             |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |      Number of new streams    |         Reserved              |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct sctp_chunk *sctp_make_strreset_addstrm(
+				const struct sctp_association *asoc,
+				__u16 out, __u16 in)
+{
+	struct sctp_strreset_addstrm addstrm;
+	__u16 length = sizeof(addstrm);
+	struct sctp_chunk *retval;
+
+	retval = sctp_make_reconf(asoc, (!!out + !!in) * length);
+	if (!retval)
+		return NULL;
+
+	if (out) {
+		addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS;
+		addstrm.param_hdr.length = htons(length);
+		addstrm.number_of_streams = htons(out);
+		addstrm.request_seq = htonl(asoc->strreset_outseq);
+		addstrm.reserved = 0;
+
+		sctp_addto_chunk(retval, length, &addstrm);
+	}
+
+	if (in) {
+		addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS;
+		addstrm.param_hdr.length = htons(length);
+		addstrm.number_of_streams = htons(in);
+		addstrm.request_seq = htonl(asoc->strreset_outseq + !!out);
+		addstrm.reserved = 0;
+
+		sctp_addto_chunk(retval, length, &addstrm);
+	}
+
+	return retval;
+}
-- 
2.1.0

Re: [PATCHv2 net-next 0/5] sctp: add support for generating stream reconf chunks

[Neil Horman]

On Sat, Jan 07, 2017 at 05:42:57PM +0800, Xin Long wrote:
> This patchset is to add some functions to generate stream reconf chunks,
> described in RFC6525 Section 3 and Section 4.
> 
> v1->v2:
>   - put these into a smaller group.
>   - rename some temporary variables in the codes.
>   - rename the titles of the commits and improve some changelogs.
> 
> Xin Long (5):
>   sctp: add a common helper function to generate stream reconf chunk
>   sctp: add support for generating stream reconf ssn reset request chunk
>   sctp: add support for generating stream reconf ssn/tsn reset request
>     chunk
>   sctp: add support for generating stream reconf response chunk
>   sctp: add support for generating stream reconf add streams request
>     chunk
> 
>  include/linux/sctp.h       |  68 ++++++++++++
>  include/net/sctp/sm.h      |  17 ++-
>  include/net/sctp/structs.h |   3 +
>  net/sctp/associola.c       |   1 +
>  net/sctp/sm_make_chunk.c   | 270 +++++++++++++++++++++++++++++++++++++++++++++
>  5 files changed, 358 insertions(+), 1 deletion(-)
> 
> -- 
> 2.1.0
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-sctp" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

These all look reasonably good, but it seems before we accept them,
there should be an additional patch that actually makes use of the code.
I presume that is forthcomming?

Neil

Re: [PATCHv2 net-next 0/5] sctp: add support for generating stream reconf chunks

[Neil Horman]

On Sat, Jan 07, 2017 at 05:42:57PM +0800, Xin Long wrote:
> This patchset is to add some functions to generate stream reconf chunks,
> described in RFC6525 Section 3 and Section 4.
> 
> v1->v2:
>   - put these into a smaller group.
>   - rename some temporary variables in the codes.
>   - rename the titles of the commits and improve some changelogs.
> 
> Xin Long (5):
>   sctp: add a common helper function to generate stream reconf chunk
>   sctp: add support for generating stream reconf ssn reset request chunk
>   sctp: add support for generating stream reconf ssn/tsn reset request
>     chunk
>   sctp: add support for generating stream reconf response chunk
>   sctp: add support for generating stream reconf add streams request
>     chunk
> 
>  include/linux/sctp.h       |  68 ++++++++++++
>  include/net/sctp/sm.h      |  17 ++-
>  include/net/sctp/structs.h |   3 +
>  net/sctp/associola.c       |   1 +
>  net/sctp/sm_make_chunk.c   | 270 +++++++++++++++++++++++++++++++++++++++++++++
>  5 files changed, 358 insertions(+), 1 deletion(-)
> 
> -- 
> 2.1.0
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-sctp" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

These all look reasonably good, but it seems before we accept them,
there should be an additional patch that actually makes use of the code.
I presume that is forthcomming?

Neil

Re: [PATCHv2 net-next 0/5] sctp: add support for generating stream reconf chunks

[David Miller]

From: Neil Horman <nhorman@tuxdriver.com>
Date: Mon, 9 Jan 2017 07:43:25 -0500

> These all look reasonably good, but it seems before we accept them,
> there should be an additional patch that actually makes use of the code.
> I presume that is forthcomming?

This all comes from my asking that the original huge set of patches be
split up.

People always just rush this kind of work and never think about laying
out the resubmission properly.

One should always only submit new interfaces along with an actual use
because only with a use can we properly review whether the new
interface is good or not.

Re: [PATCHv2 net-next 0/5] sctp: add support for generating stream reconf chunks

[David Miller]

From: Neil Horman <nhorman@tuxdriver.com>
Date: Mon, 9 Jan 2017 07:43:25 -0500

> These all look reasonably good, but it seems before we accept them,
> there should be an additional patch that actually makes use of the code.
> I presume that is forthcomming?

This all comes from my asking that the original huge set of patches be
split up.

People always just rush this kind of work and never think about laying
out the resubmission properly.

One should always only submit new interfaces along with an actual use
because only with a use can we properly review whether the new
interface is good or not.

Re: [PATCHv2 net-next 0/5] sctp: add support for generating stream reconf chunks

[Xin Long]

On Mon, Jan 9, 2017 at 11:53 PM, David Miller <davem@davemloft.net> wrote:
> From: Neil Horman <nhorman@tuxdriver.com>
> Date: Mon, 9 Jan 2017 07:43:25 -0500
>
>> These all look reasonably good, but it seems before we accept them,
>> there should be an additional patch that actually makes use of the code.
>> I presume that is forthcomming?
>
> This all comes from my asking that the original huge set of patches be
> split up.
>
> People always just rush this kind of work and never think about laying
> out the resubmission properly.
>
> One should always only submit new interfaces along with an actual use
> because only with a use can we properly review whether the new
> interface is good or not.

I was trying to keep the same order with rfc, but it seems not a good
idea, will resplit, thanks.

Re: [PATCHv2 net-next 0/5] sctp: add support for generating stream reconf chunks

[Xin Long]

On Mon, Jan 9, 2017 at 11:53 PM, David Miller <davem@davemloft.net> wrote:
> From: Neil Horman <nhorman@tuxdriver.com>
> Date: Mon, 9 Jan 2017 07:43:25 -0500
>
>> These all look reasonably good, but it seems before we accept them,
>> there should be an additional patch that actually makes use of the code.
>> I presume that is forthcomming?
>
> This all comes from my asking that the original huge set of patches be
> split up.
>
> People always just rush this kind of work and never think about laying
> out the resubmission properly.
>
> One should always only submit new interfaces along with an actual use
> because only with a use can we properly review whether the new
> interface is good or not.

I was trying to keep the same order with rfc, but it seems not a good
idea, will resplit, thanks.

Re: [PATCHv2 net-next 0/5] sctp: add support for generating stream reconf chunks

[David Miller]

From: Xin Long <lucien.xin@gmail.com>
Date: Tue, 10 Jan 2017 02:27:09 +0800

> I was trying to keep the same order with rfc, but it seems not a good
> idea, will resplit, thanks.

Thank you.

Re: [PATCHv2 net-next 0/5] sctp: add support for generating stream reconf chunks

[David Miller]

From: Xin Long <lucien.xin@gmail.com>
Date: Tue, 10 Jan 2017 02:27:09 +0800

> I was trying to keep the same order with rfc, but it seems not a good
> idea, will resplit, thanks.

Thank you.

Re: [PATCHv2 net-next 0/5] sctp: add support for generating stream reconf chunks

[Marcelo Ricardo Leitner]

On Tue, Jan 10, 2017 at 02:27:09AM +0800, Xin Long wrote:
> On Mon, Jan 9, 2017 at 11:53 PM, David Miller <davem@davemloft.net> wrote:
> > From: Neil Horman <nhorman@tuxdriver.com>
> > Date: Mon, 9 Jan 2017 07:43:25 -0500
> >
> >> These all look reasonably good, but it seems before we accept them,
> >> there should be an additional patch that actually makes use of the code.
> >> I presume that is forthcomming?
> >
> > This all comes from my asking that the original huge set of patches be
> > split up.
> >
> > People always just rush this kind of work and never think about laying
> > out the resubmission properly.
> >
> > One should always only submit new interfaces along with an actual use
> > because only with a use can we properly review whether the new
> > interface is good or not.
> 
> I was trying to keep the same order with rfc, but it seems not a good
> idea, will resplit, thanks.

Not sure how much it can help but one idea it to split it into requester
and requested sides. Do the first patches/patchsets to make Linux able
to accept/handle requests, and then to issue requests.

  Marcelo

Re: [PATCHv2 net-next 0/5] sctp: add support for generating stream reconf chunks

[Marcelo Ricardo Leitner]

On Tue, Jan 10, 2017 at 02:27:09AM +0800, Xin Long wrote:
> On Mon, Jan 9, 2017 at 11:53 PM, David Miller <davem@davemloft.net> wrote:
> > From: Neil Horman <nhorman@tuxdriver.com>
> > Date: Mon, 9 Jan 2017 07:43:25 -0500
> >
> >> These all look reasonably good, but it seems before we accept them,
> >> there should be an additional patch that actually makes use of the code.
> >> I presume that is forthcomming?
> >
> > This all comes from my asking that the original huge set of patches be
> > split up.
> >
> > People always just rush this kind of work and never think about laying
> > out the resubmission properly.
> >
> > One should always only submit new interfaces along with an actual use
> > because only with a use can we properly review whether the new
> > interface is good or not.
> 
> I was trying to keep the same order with rfc, but it seems not a good
> idea, will resplit, thanks.

Not sure how much it can help but one idea it to split it into requester
and requested sides. Do the first patches/patchsets to make Linux able
to accept/handle requests, and then to issue requests.

  Marcelo