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sctp: add basic structures and make chunk function for ifwdtsn 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
include/linux/sctp.h
View File

@ -110,6 +110,7 @@ enum sctp_cid {
/* Use hex, as defined in ADDIP sec. 3.1 */
SCTP_CID_ASCONF = 0xC1,
SCTP_CID_I_FWD_TSN = 0xC2,
SCTP_CID_ASCONF_ACK = 0x80,
SCTP_CID_RECONF = 0x82,
}; /* enum */
@ -616,6 +617,22 @@ struct sctp_fwdtsn_chunk {
struct sctp_fwdtsn_hdr fwdtsn_hdr;
};
struct sctp_ifwdtsn_skip {
__be16 stream;
__u8 reserved;
__u8 flags;
__be32 mid;
};
struct sctp_ifwdtsn_hdr {
__be32 new_cum_tsn;
struct sctp_ifwdtsn_skip skip[0];
};
struct sctp_ifwdtsn_chunk {
struct sctp_chunkhdr chunk_hdr;
struct sctp_ifwdtsn_hdr fwdtsn_hdr;
};
/* ADDIP
* Section 3.1.1 Address Configuration Change Chunk (ASCONF)

3
include/net/sctp/sm.h
View File

@ -199,6 +199,9 @@ struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
const struct sctp_chunk *chunk);
struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc,
__u8 flags, int paylen, gfp_t gfp);
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 *sctp_make_datafrag_empty(const struct sctp_association *asoc,
const struct sctp_sndrcvinfo *sinfo,
int len, __u8 flags, gfp_t gfp);

1
include/net/sctp/structs.h
View File

@ -599,6 +599,7 @@ struct sctp_chunk {
struct sctp_fwdtsn_hdr *fwdtsn_hdr;
struct sctp_authhdr *auth_hdr;
struct sctp_idatahdr *idata_hdr;
struct sctp_ifwdtsn_hdr *ifwdtsn_hdr;
} subh;
__u8 *chunk_end;

24
net/sctp/sm_make_chunk.c
View File

@ -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