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Commit ad05a7a0 authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

sctp: add basic structures and make chunk function for idata 



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: default avatarXin Long <lucien.xin@gmail.com>
Acked-by: default avatarMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: default avatarNeil Horman <nhorman@tuxdriver.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 96b120b3

include/linux/sctp.h

+17 −0
Original line number Diff line number Diff line
@@ -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,

include/net/sctp/sm.h

+2 −0
Original line number Diff line number Diff line
@@ -197,6 +197,8 @@ struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 
struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,

				 const __u32 lowest_tsn,

				 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_datafrag_empty(struct sctp_association *asoc,

					    const struct sctp_sndrcvinfo *sinfo,

					    int len, const __u8 flags,

include/net/sctp/structs.h

+1 −0
Original line number Diff line number Diff line
@@ -575,6 +575,7 @@ struct sctp_chunk { 
		struct sctp_addiphdr *addip_hdr;

		struct sctp_fwdtsn_hdr *fwdtsn_hdr;

		struct sctp_authhdr *auth_hdr;

		struct sctp_idatahdr *idata_hdr;

	} subh;



	__u8 *chunk_end;

net/sctp/sm_make_chunk.c

+6 −0
Original line number Diff line number Diff line
@@ -1425,6 +1425,12 @@ static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 
	return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp);

}



struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc,

				   __u8 flags, int paylen, gfp_t gfp)

{

	return _sctp_make_chunk(asoc, SCTP_CID_I_DATA, flags, paylen, gfp);

}



static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,

					    __u8 type, __u8 flags, int paylen,

					    gfp_t gfp)