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Message-Id: <be9631328644431b88ba998d6234485578957156.1483781759.git.lucien.xin@gmail.com>
Date: Sat, 7 Jan 2017 17:43:01 +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 4/5] sctp: add support for generating stream reconf response chunk
This patch is to define Re-configuration Response Parameter described
in rfc6525 section 4.4. As optional fields are only for SSN/TSN Reset
Request Parameter, it uses another function to make that.
Signed-off-by: Xin Long <lucien.xin@...il.com>
---
include/linux/sctp.h | 24 ++++++++++++++++
include/net/sctp/sm.h | 7 +++++
net/sctp/sm_make_chunk.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 105 insertions(+)
diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index cc4c74d..c4fcc7d 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -747,4 +747,28 @@ struct sctp_strreset_tsnreq {
__u32 request_seq;
} __packed;
+enum {
+ SCTP_STRRESET_NOTHING_TO_DO = 0x00,
+ SCTP_STRRESET_PERFORMED = 0x01,
+ SCTP_STRRESET_DENIED = 0x02,
+ SCTP_STRRESET_ERR_WRONG_SSN = 0x03,
+ SCTP_STRRESET_ERR_IN_PROGRESS = 0x04,
+ SCTP_STRRESET_ERR_BAD_SEQNO = 0x05,
+ SCTP_STRRESET_IN_PROGRESS = 0x06,
+};
+
+struct sctp_strreset_resp {
+ sctp_paramhdr_t param_hdr;
+ __u32 response_seq;
+ __u32 result;
+} __packed;
+
+struct sctp_strreset_resptsn {
+ sctp_paramhdr_t param_hdr;
+ __u32 response_seq;
+ __u32 result;
+ __u32 senders_next_tsn;
+ __u32 receivers_next_tsn;
+} __packed;
+
#endif /* __LINUX_SCTP_H__ */
diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index c658700..013d69f 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -265,6 +265,13 @@ struct sctp_chunk *sctp_make_strreset_req(
bool out, bool in);
struct sctp_chunk *sctp_make_strreset_tsnreq(
const struct sctp_association *asoc);
+struct sctp_chunk *sctp_make_strreset_resp(
+ const struct sctp_association *asoc,
+ __u32 result, __u32 sn);
+struct sctp_chunk *sctp_make_strreset_tsnresp(
+ struct sctp_association *asoc,
+ __u32 result, __u32 sn,
+ __u32 sender_tsn, __u32 receiver_tsn);
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 f1d8f07..34edb30 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -3676,3 +3676,77 @@ struct sctp_chunk *sctp_make_strreset_tsnreq(
return retval;
}
+
+/* RE-CONFIG 4.4 (RESP)
+ * 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 = 16 | Parameter Length |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Re-configuration Response Sequence Number |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Result |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct sctp_chunk *sctp_make_strreset_resp(
+ const struct sctp_association *asoc,
+ __u32 result, __u32 sn)
+{
+ struct sctp_strreset_resp resp;
+ __u16 length = sizeof(resp);
+ struct sctp_chunk *retval;
+
+ retval = sctp_make_reconf(asoc, length);
+ if (!retval)
+ return NULL;
+
+ resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
+ resp.param_hdr.length = htons(length);
+ resp.response_seq = htonl(sn);
+ resp.result = htonl(result);
+
+ sctp_addto_chunk(retval, sizeof(resp), &resp);
+
+ return retval;
+}
+
+/* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
+ * 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 = 16 | Parameter Length |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Re-configuration Response Sequence Number |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Result |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Sender's Next TSN (optional) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Receiver's Next TSN (optional) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct sctp_chunk *sctp_make_strreset_tsnresp(
+ struct sctp_association *asoc,
+ __u32 result, __u32 sn,
+ __u32 sender_tsn, __u32 receiver_tsn)
+{
+ struct sctp_strreset_resptsn tsnresp;
+ __u16 length = sizeof(tsnresp);
+ struct sctp_chunk *retval;
+
+ retval = sctp_make_reconf(asoc, length);
+ if (!retval)
+ return NULL;
+
+ tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
+ tsnresp.param_hdr.length = htons(length);
+
+ tsnresp.response_seq = htonl(sn);
+ tsnresp.result = htonl(result);
+ tsnresp.senders_next_tsn = htonl(sender_tsn);
+ tsnresp.receivers_next_tsn = htonl(receiver_tsn);
+
+ sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp);
+
+ return retval;
+}
--
2.1.0
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