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sctp: add support for generating stream reconf ssn/tsn reset request chunk 

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>
Signed-off-by: David S. Miller <davem@davemloft.net>
zero-colors
Xin Long 2017-02-09 01:18:17 +08:00 committed by David S. Miller
parent 119aecbae5
commit c56480a1e9
3 changed files with 36 additions and 0 deletions
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5
include/linux/sctp.h
View File

@ -737,4 +737,9 @@ struct sctp_strreset_inreq {
__u16 list_of_streams[0];
};
struct sctp_strreset_tsnreq {
sctp_paramhdr_t param_hdr;
__u32 request_seq;
};
#endif /* __LINUX_SCTP_H__ */

2
include/net/sctp/sm.h
View File

@ -265,6 +265,8 @@ 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 *);

29
net/sctp/sm_make_chunk.c
View File

@ -3658,3 +3658,32 @@ 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;
}