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Commit bd4b9f8b authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

sctp: add support for generating stream reconf resp chunk 



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: default avatarXin Long <lucien.xin@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 61845d20

include/linux/sctp.h

+24 −0
Original line number Diff line number Diff line
@@ -749,4 +749,28 @@ struct sctp_strreset_addstrm { 
	__u16 reserved;

};



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;

};



struct sctp_strreset_resptsn {

	sctp_paramhdr_t param_hdr;

	__u32 response_seq;

	__u32 result;

	__u32 senders_next_tsn;

	__u32 receivers_next_tsn;

};



#endif /* __LINUX_SCTP_H__ */

include/net/sctp/sm.h

+7 −0
Original line number Diff line number Diff line
@@ -270,6 +270,13 @@ struct sctp_chunk *sctp_make_strreset_tsnreq( 
struct sctp_chunk *sctp_make_strreset_addstrm(

				const struct sctp_association *asoc,

				__u16 out, __u16 in);

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 *);

net/sctp/sm_make_chunk.c

+74 −0
Original line number Diff line number Diff line
@@ -3733,3 +3733,77 @@ struct sctp_chunk *sctp_make_strreset_addstrm( 


	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;

}