sctp: add basic structures and make chunk function for ifwdtsn
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.xin@gmail.com> Acked-by: Marcelo R. Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -110,6 +110,7 @@ enum sctp_cid {
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/* Use hex, as defined in ADDIP sec. 3.1 */
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SCTP_CID_ASCONF = 0xC1,
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SCTP_CID_I_FWD_TSN = 0xC2,
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SCTP_CID_ASCONF_ACK = 0x80,
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SCTP_CID_RECONF = 0x82,
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}; /* enum */
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@ -616,6 +617,22 @@ struct sctp_fwdtsn_chunk {
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struct sctp_fwdtsn_hdr fwdtsn_hdr;
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};
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struct sctp_ifwdtsn_skip {
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__be16 stream;
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__u8 reserved;
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__u8 flags;
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__be32 mid;
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};
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struct sctp_ifwdtsn_hdr {
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__be32 new_cum_tsn;
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struct sctp_ifwdtsn_skip skip[0];
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};
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struct sctp_ifwdtsn_chunk {
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struct sctp_chunkhdr chunk_hdr;
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struct sctp_ifwdtsn_hdr fwdtsn_hdr;
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};
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/* ADDIP
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* Section 3.1.1 Address Configuration Change Chunk (ASCONF)
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@ -199,6 +199,9 @@ struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
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const struct sctp_chunk *chunk);
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struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc,
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__u8 flags, int paylen, gfp_t gfp);
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struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc,
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__u32 new_cum_tsn, size_t nstreams,
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struct sctp_ifwdtsn_skip *skiplist);
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struct sctp_chunk *sctp_make_datafrag_empty(const struct sctp_association *asoc,
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const struct sctp_sndrcvinfo *sinfo,
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int len, __u8 flags, gfp_t gfp);
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@ -599,6 +599,7 @@ struct sctp_chunk {
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struct sctp_fwdtsn_hdr *fwdtsn_hdr;
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struct sctp_authhdr *auth_hdr;
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struct sctp_idatahdr *idata_hdr;
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struct sctp_ifwdtsn_hdr *ifwdtsn_hdr;
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} subh;
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__u8 *chunk_end;
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@ -3536,6 +3536,30 @@ struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
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return retval;
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}
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struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc,
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__u32 new_cum_tsn, size_t nstreams,
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struct sctp_ifwdtsn_skip *skiplist)
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{
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struct sctp_chunk *retval = NULL;
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struct sctp_ifwdtsn_hdr ftsn_hdr;
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size_t hint;
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hint = (nstreams + 1) * sizeof(__u32);
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retval = sctp_make_control(asoc, SCTP_CID_I_FWD_TSN, 0, hint,
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GFP_ATOMIC);
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if (!retval)
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return NULL;
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ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
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retval->subh.ifwdtsn_hdr =
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sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
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sctp_addto_chunk(retval, nstreams * sizeof(skiplist[0]), skiplist);
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return retval;
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}
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/* RE-CONFIG 3.1 (RE-CONFIG chunk)
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* 0 1 2 3
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* 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
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