[PATCH 16/26] netlink: add a basic rtnetlink parser of addrlabel messages

[JingPiao Chen]

* rtnl_addrlabel.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* netlink_route.h (decode_ifaddrlblmsg): New prototype.
* configure.ac (AC_CHECK_HEADERS): Add linux/if_addrlabel.h.
(AC_CHECK_TYPES): Check for struct ifaddrlblmsg in <linux/if_addrlabel.h>.
* netlink_route.c (route_decoders): Add RTM_DELADDRLABEL,
RTM_GETADDRLABEL and RTM_NEWADDRLABEL.

Co-authored-by: Fabien Siron <fabien.siron at epita.fr>
---
 Makefile.am      |  1 +
 configure.ac     |  2 ++
 netlink_route.c  |  8 +++++++-
 netlink_route.h  |  1 +
 rtnl_addrlabel.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 72 insertions(+), 1 deletion(-)
 create mode 100644 rtnl_addrlabel.c

diff --git a/Makefile.am b/Makefile.am
index 605a3b6..95b97a8 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -248,6 +248,7 @@ strace_SOURCES =	\
 	rt_sigreturn.c	\
 	rtc.c		\
 	rtnl_addr.c	\
+	rtnl_addrlabel.c \
 	rtnl_link.c	\
 	rtnl_neigh.c	\
 	rtnl_neightbl.c	\
diff --git a/configure.ac b/configure.ac
index 5b547b2..9ba1679 100644
--- a/configure.ac
+++ b/configure.ac
@@ -378,6 +378,7 @@ AC_CHECK_HEADERS(m4_normalize([
 	linux/genetlink.h
 	linux/hiddev.h
 	linux/if_addr.h
+	linux/if_addrlabel.h
 	linux/ip_vs.h
 	linux/ipc.h
 	linux/mmtimer.h
@@ -439,6 +440,7 @@ AC_CHECK_HEADERS([linux/bpf.h], [
 ])
 
 AC_CHECK_TYPES([struct fib_rule_hdr],,, [#include <linux/fib_rules.h>])
+AC_CHECK_TYPES([struct ifaddrlblmsg],,, [#include <linux/if_addrlabel.h>])
 
 AC_CHECK_TYPES([struct statfs], [
 	AC_CHECK_MEMBERS([struct statfs.f_frsize],,, [#include <linux/types.h>
diff --git a/netlink_route.c b/netlink_route.c
index b848750..21c7585 100644
--- a/netlink_route.c
+++ b/netlink_route.c
@@ -97,7 +97,13 @@ static const netlink_route_decoder_t route_decoders[] = {
 
 	[RTM_DELACTION - RTM_BASE] = decode_tcamsg,
 	[RTM_GETACTION - RTM_BASE] = decode_tcamsg,
-	[RTM_NEWACTION - RTM_BASE] = decode_tcamsg
+	[RTM_NEWACTION - RTM_BASE] = decode_tcamsg,
+
+#ifdef HAVE_STRUCT_IFADDRLBLMSG
+	[RTM_DELADDRLABEL - RTM_BASE] = decode_ifaddrlblmsg,
+	[RTM_GETADDRLABEL - RTM_BASE] = decode_ifaddrlblmsg,
+	[RTM_NEWADDRLABEL - RTM_BASE] = decode_ifaddrlblmsg
+#endif
 };
 
 bool
diff --git a/netlink_route.h b/netlink_route.h
index 3789e07..d172f01 100644
--- a/netlink_route.h
+++ b/netlink_route.h
@@ -40,6 +40,7 @@ route_decode_name(struct tcb *tcp,			\
 /* End of DECL_NETLINK_ROUTE_DECODER definition. */
 
 extern DECL_NETLINK_ROUTE_DECODER(decode_fib_rule_hdr);
+extern DECL_NETLINK_ROUTE_DECODER(decode_ifaddrlblmsg);
 extern DECL_NETLINK_ROUTE_DECODER(decode_ifaddrmsg);
 extern DECL_NETLINK_ROUTE_DECODER(decode_ifinfomsg);
 extern DECL_NETLINK_ROUTE_DECODER(decode_ndmsg);
diff --git a/rtnl_addrlabel.c b/rtnl_addrlabel.c
new file mode 100644
index 0000000..685e04d
--- /dev/null
+++ b/rtnl_addrlabel.c
@@ -0,0 +1,61 @@
+/*
+ * 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"
+
+#ifdef HAVE_LINUX_IF_ADDRLABEL_H
+
+# include "netlink_route.h"
+# include "print_fields.h"
+
+# include <linux/if_addrlabel.h>
+
+DECL_NETLINK_ROUTE_DECODER(decode_ifaddrlblmsg)
+{
+	struct ifaddrlblmsg ifal = { .ifal_family = family };
+	const size_t offset = sizeof(ifal.ifal_family);
+
+	PRINT_FIELD_XVAL("{", ifal, ifal_family, addrfams, "AF_???");
+
+	tprints(", ");
+	if (len >= sizeof(ifal)) {
+		if (!umoven_or_printaddr(tcp, addr + offset,
+					 sizeof(ifal) - offset,
+					 (void *) &ifal + offset)) {
+			PRINT_FIELD_U("", ifal, ifal_prefixlen);
+			PRINT_FIELD_U(", ", ifal, ifal_flags);
+			PRINT_FIELD_IFINDEX(", ", ifal, ifal_index);
+			PRINT_FIELD_U(", ", ifal, ifal_seq);
+		}
+	} else
+		tprints("...");
+	tprints("}");
+}
+
+#endif
-- 
2.7.4