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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: 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
View File

@ -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,

2
include/net/sctp/sm.h
View File

@ -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,

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

@ -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;

6
net/sctp/sm_make_chunk.c
View File

@ -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)