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sctp: add basic structures and make chunk function for ifwdtsn

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sctp_ifwdtsn_skip, sctp_ifwdtsn_hdr and sctp_ifwdtsn_chunk are used to
define and parse I-FWD TSN chunk format, and sctp_make_ifwdtsn is a
function to build the chunk.

The I-FORWARD-TSN Chunk Format is defined in section 2.3.1 of RFC8260.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo R. Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long
2017-12-15 00:41:25 +08:00
committed by David S. Miller
parent 024778095a
commit 2d07a49ade
4 changed files with 45 additions and 0 deletions
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24
net/sctp/sm_make_chunk.c
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@@ -3536,6 +3536,30 @@ struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
return retval;
}
struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc,
__u32 new_cum_tsn, size_t nstreams,
struct sctp_ifwdtsn_skip *skiplist)
{
struct sctp_chunk *retval = NULL;
struct sctp_ifwdtsn_hdr ftsn_hdr;
size_t hint;
hint = (nstreams + 1) * sizeof(__u32);
retval = sctp_make_control(asoc, SCTP_CID_I_FWD_TSN, 0, hint,
GFP_ATOMIC);
if (!retval)
return NULL;
ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
retval->subh.ifwdtsn_hdr =
sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
sctp_addto_chunk(retval, nstreams * sizeof(skiplist[0]), skiplist);
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