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Message-Id: <10e93a2d60d92fdda0357ba4f958c1c8b4e6f5fb.1483781759.git.lucien.xin@gmail.com>
Date: Sat, 7 Jan 2017 17:43:02 +0800
From: Xin Long <lucien.xin@...il.com>
To: network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
Neil Horman <nhorman@...driver.com>,
Vlad Yasevich <vyasevich@...il.com>, davem@...emloft.net
Subject: [PATCHv2 net-next 5/5] sctp: add support for generating stream reconf add streams request chunk
This patch is to define Add Incoming/Outgoing Streams Request
Parameter described in rfc6525 section 4.5 and 4.6. They can
be in one same chunk trunk as rfc6525 section 3.1-7 describes,
so make them in one function.
Signed-off-by: Xin Long <lucien.xin@...il.com>
---
include/linux/sctp.h | 7 +++++++
include/net/sctp/sm.h | 3 +++
net/sctp/sm_make_chunk.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 56 insertions(+)
diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index c4fcc7d..3a9f234 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -771,4 +771,11 @@ struct sctp_strreset_resptsn {
__u32 receivers_next_tsn;
} __packed;
+struct sctp_strreset_addstrm {
+ sctp_paramhdr_t param_hdr;
+ __u32 request_seq;
+ __u16 number_of_streams;
+ __u16 reserved;
+} __packed;
+
#endif /* __LINUX_SCTP_H__ */
diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index 013d69f..35986d0 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -272,6 +272,9 @@ struct sctp_chunk *sctp_make_strreset_tsnresp(
struct sctp_association *asoc,
__u32 result, __u32 sn,
__u32 sender_tsn, __u32 receiver_tsn);
+struct sctp_chunk *sctp_make_strreset_addstrm(
+ const struct sctp_association *asoc,
+ __u16 out, __u16 in);
void sctp_chunk_assign_tsn(struct sctp_chunk *);
void sctp_chunk_assign_ssn(struct sctp_chunk *);
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 34edb30..e6a5530 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -3750,3 +3750,49 @@ struct sctp_chunk *sctp_make_strreset_tsnresp(
return retval;
}
+
+/* RE-CONFIG 4.5/4.6 (ADD STREAM)
+ * 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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Parameter Type = 17 | Parameter Length = 12 |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Re-configuration Request Sequence Number |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Number of new streams | Reserved |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct sctp_chunk *sctp_make_strreset_addstrm(
+ const struct sctp_association *asoc,
+ __u16 out, __u16 in)
+{
+ struct sctp_strreset_addstrm addstrm;
+ __u16 length = sizeof(addstrm);
+ struct sctp_chunk *retval;
+
+ retval = sctp_make_reconf(asoc, (!!out + !!in) * length);
+ if (!retval)
+ return NULL;
+
+ if (out) {
+ addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS;
+ addstrm.param_hdr.length = htons(length);
+ addstrm.number_of_streams = htons(out);
+ addstrm.request_seq = htonl(asoc->strreset_outseq);
+ addstrm.reserved = 0;
+
+ sctp_addto_chunk(retval, length, &addstrm);
+ }
+
+ if (in) {
+ addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS;
+ addstrm.param_hdr.length = htons(length);
+ addstrm.number_of_streams = htons(in);
+ addstrm.request_seq = htonl(asoc->strreset_outseq + !!out);
+ addstrm.reserved = 0;
+
+ sctp_addto_chunk(retval, length, &addstrm);
+ }
+
+ return retval;
+}
--
2.1.0
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