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Message-Id: <f1875fdb7c77e5f7a7fe33a1e1d2554da24901bb.1483781759.git.lucien.xin@gmail.com>
Date: Sat, 7 Jan 2017 17:42:58 +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 1/5] sctp: add a common helper function to generate stream reconf chunk
This patch is to define a common api used to alloc memory and initialize
reconf chunk header that described in rfc6525 section 3.1.
All reconf chunks will be generated by calling this helper function.
Signed-off-by: Xin Long <lucien.xin@...il.com>
---
include/linux/sctp.h | 6 ++++++
net/sctp/sm_make_chunk.c | 33 +++++++++++++++++++++++++++++++++
2 files changed, 39 insertions(+)
diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index fcb4c36..cdc3b05 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -108,6 +108,7 @@ typedef enum {
/* Use hex, as defined in ADDIP sec. 3.1 */
SCTP_CID_ASCONF = 0xC1,
SCTP_CID_ASCONF_ACK = 0x80,
+ SCTP_CID_RECONF = 0x82,
} sctp_cid_t; /* enum */
@@ -710,4 +711,9 @@ struct sctp_infox {
struct sctp_association *asoc;
};
+struct sctp_reconf_chunk {
+ sctp_chunkhdr_t chunk_hdr;
+ __u8 params[0];
+} __packed;
+
#endif /* __LINUX_SCTP_H__ */
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index a15d824..fd58097 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -3526,3 +3526,36 @@ struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Type = 130 | Chunk Flags | Chunk Length |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * \ \
+ * / Re-configuration Parameter /
+ * \ \
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * \ \
+ * / Re-configuration Parameter (optional) /
+ * \ \
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+static struct sctp_chunk *sctp_make_reconf(
+ const struct sctp_association *asoc,
+ int length)
+{
+ struct sctp_reconf_chunk *reconf;
+ struct sctp_chunk *retval;
+
+ retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length,
+ GFP_ATOMIC);
+ if (!retval)
+ return NULL;
+
+ reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr;
+ retval->param_hdr.v = reconf->params;
+
+ return retval;
+}
--
2.1.0
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