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sctp: add basic structures and make chunk function for idata

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sctp_idatahdr and sctp_idata_chunk are used to define and parse
I-DATA chunk format, and sctp_make_idata is a function to build
the chunk.

The I-DATA Chunk Format is defined in section 2.1 of RFC8260.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2017-12-08 21:04:00 +08:00 • committed by David S. Miller
parent 96b120b3c1
commit ad05a7a05e
4 changed files with 26 additions and 0 deletions
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17
include/linux/sctp.h
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@ -243,6 +243,23 @@ struct sctp_data_chunk {
struct sctp_datahdr data_hdr;
};
struct sctp_idatahdr {
__be32 tsn;
__be16 stream;
__be16 reserved;
__be32 mid;
union {
__u32 ppid;
__be32 fsn;
};
__u8 payload[0];
};
struct sctp_idata_chunk {
struct sctp_chunkhdr chunk_hdr;
struct sctp_idatahdr data_hdr;
};
/* DATA Chuck Specific Flags */
enum {
SCTP_DATA_MIDDLE_FRAG = 0x00,