On Fri, Dec 15, 2017 at 12:41:25AM +0800, Xin Long wrote:
> 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>
Acked-by: Marcelo R. Leitner <marcelo.leit...@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
>
> --
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