[PATCH 12/26] netlink: add a basic rtnetlink parser of tc messages

[JingPiao Chen]

* rtnl_tc.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* netlink_route.h (decode_tcmsg): New prototype.
* netlink_route.c (route_decoders): Add RTM_DELQDISC,
RTM_GETQDISC, RTM_NEWQDISC, RTM_DELTCLASS, RTM_GETTCLASS,
RTM_NEWTCLASS, RTM_DELTFILTER, RTM_GETTFILTER and RTM_NEWTFILTER.

Co-authored-by: Fabien Siron <fabien.siron at epita.fr>
---
 Makefile.am     |  1 +
 netlink_route.c | 12 +++++++++++-
 netlink_route.h |  1 +
 rtnl_tc.c       | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 70 insertions(+), 1 deletion(-)
 create mode 100644 rtnl_tc.c

diff --git a/Makefile.am b/Makefile.am
index 27e3374..928721e 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -253,6 +253,7 @@ strace_SOURCES =	\
 	rtnl_neightbl.c	\
 	rtnl_route.c	\
 	rtnl_rule.c	\
+	rtnl_tc.c	\
 	sched.c		\
 	sched_attr.h	\
 	scsi.c		\
diff --git a/netlink_route.c b/netlink_route.c
index d1a1f37..0b567c2 100644
--- a/netlink_route.c
+++ b/netlink_route.c
@@ -83,7 +83,17 @@ static const netlink_route_decoder_t route_decoders[] = {
 
 	[RTM_GETNEIGHTBL - RTM_BASE] = decode_ndtmsg,
 	[RTM_NEWNEIGHTBL - RTM_BASE] = decode_ndtmsg,
-	[RTM_SETNEIGHTBL - RTM_BASE] = decode_ndtmsg
+	[RTM_SETNEIGHTBL - RTM_BASE] = decode_ndtmsg,
+
+	[RTM_DELQDISC - RTM_BASE] = decode_tcmsg,
+	[RTM_GETQDISC - RTM_BASE] = decode_tcmsg,
+	[RTM_NEWQDISC - RTM_BASE] = decode_tcmsg,
+	[RTM_DELTCLASS - RTM_BASE] = decode_tcmsg,
+	[RTM_GETTCLASS - RTM_BASE] = decode_tcmsg,
+	[RTM_NEWTCLASS - RTM_BASE] = decode_tcmsg,
+	[RTM_DELTFILTER - RTM_BASE] = decode_tcmsg,
+	[RTM_GETTFILTER - RTM_BASE] = decode_tcmsg,
+	[RTM_NEWTFILTER - RTM_BASE] = decode_tcmsg
 };
 
 bool
diff --git a/netlink_route.h b/netlink_route.h
index 32972c2..4a50847 100644
--- a/netlink_route.h
+++ b/netlink_route.h
@@ -46,5 +46,6 @@ extern DECL_NETLINK_ROUTE_DECODER(decode_ndmsg);
 extern DECL_NETLINK_ROUTE_DECODER(decode_ndtmsg);
 extern DECL_NETLINK_ROUTE_DECODER(decode_rtm_getneigh);
 extern DECL_NETLINK_ROUTE_DECODER(decode_rtmsg);
+extern DECL_NETLINK_ROUTE_DECODER(decode_tcmsg);
 
 #endif /* !STRACE_NETLINK_ROUTE_H */
diff --git a/rtnl_tc.c b/rtnl_tc.c
new file mode 100644
index 0000000..db06e55
--- /dev/null
+++ b/rtnl_tc.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2016 Fabien Siron <fabien.siron at epita.fr>
+ * Copyright (c) 2017 JingPiao Chen <chenjingpiao at gmail.com>
+ * Copyright (c) 2016-2017 The strace developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "defs.h"
+#include "netlink_route.h"
+#include "print_fields.h"
+
+#include "netlink.h"
+#include <linux/rtnetlink.h>
+
+DECL_NETLINK_ROUTE_DECODER(decode_tcmsg)
+{
+	struct tcmsg tcmsg = { .tcm_family = family };
+	const size_t offset = sizeof(tcmsg.tcm_family);
+
+	PRINT_FIELD_XVAL("{", tcmsg, tcm_family, addrfams, "AF_???");
+
+	tprints(", ");
+	if (len >= sizeof(tcmsg)) {
+		if (!umoven_or_printaddr(tcp, addr + offset,
+					 sizeof(tcmsg) - offset,
+					 (void *) &tcmsg + offset)) {
+			PRINT_FIELD_IFINDEX("", tcmsg, tcm_ifindex);
+			PRINT_FIELD_U(", ", tcmsg, tcm_handle);
+			PRINT_FIELD_U(", ", tcmsg, tcm_parent);
+			PRINT_FIELD_U(", ", tcmsg, tcm_info);
+		}
+	} else
+		tprints("...");
+	tprints("}");
+}
-- 
2.7.4