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....@gmail.com>
---
include/linux/sctp.h | 17 +++++++++++++++++
include/net/sctp/sm.h | 3 +++
include/net/sctp/structs.h | 1 +
net/sctp/sm_make_chunk.c | 24 ++++++++++++++++++++++++
4 files changed, 45 insertions(+)
diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index 38e2cf6..b36c766 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -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)
diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index 0993b49..2883c43 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -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);
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 8ef638d..a5c3cf4 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -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;
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 23a7313..b9b269c 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -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
--
2.1.0
