From c56480a1e90261842f54f3a5a9ebc12d827f0c3e Mon Sep 17 00:00:00 2001 From: Xin Long Date: Thu, 9 Feb 2017 01:18:17 +0800 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- 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 d74fca3f3141..71c0d41d9a59 100644 --- a/include/linux/sctp.h +++ b/include/linux/sctp.h @@ -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__ */ diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h index 430ed139fbbb..ac37c1782e23 100644 --- a/include/net/sctp/sm.h +++ b/include/net/sctp/sm.h @@ -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 *); diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c index c7d3249f88ec..749842aead33 100644 --- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -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; +} -- 2.20.1