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@xxxxxxxxx>
---
include/linux/sctp.h | 17 +++++++++++++++++
include/net/sctp/sm.h | 2 ++
include/net/sctp/structs.h | 1 +
net/sctp/sm_make_chunk.c | 6 ++++++
4 files changed, 26 insertions(+)
diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index 6d2bd64..38e2cf6 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -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,
diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index 70fb397..5389ae0 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -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,
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index dd2bb62..15183bf 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -574,6 +574,7 @@ 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;
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index da33c85..b969397 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -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)
--
2.1.0
--
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