[PATCH 02/26] netlink: add a basic rtnetlink parser of addr messages

[JingPiao Chen]

* rtnl_addr.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* configure.ac (AC_CHECK_HEADERS): Add linux/if_addr.h.
* netlink_route.h (decode_ifaddrmsg): New prototype.
* netlink_route.c (route_decoders): Add RTM_DELADDR,
RTM_GETADDR, RTM_GETANYCAST, RTM_GETMULTICAST add RTM_NEWADDR.
* xlat/ifaddrflags.in: New file.

Co-authored-by: Fabien Siron <fabien.siron at epita.fr>
---
 Makefile.am         |  1 +
 configure.ac        |  1 +
 netlink_route.c     |  8 ++++++-
 netlink_route.h     |  1 +
 rtnl_addr.c         | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 xlat/ifaddrflags.in | 12 +++++++++++
 6 files changed, 83 insertions(+), 1 deletion(-)
 create mode 100644 rtnl_addr.c
 create mode 100644 xlat/ifaddrflags.in

diff --git a/Makefile.am b/Makefile.am
index 7e7d3db..0e88728 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -247,6 +247,7 @@ strace_SOURCES =	\
 	rt_sigframe.c	\
 	rt_sigreturn.c	\
 	rtc.c		\
+	rtnl_addr.c	\
 	rtnl_link.c	\
 	sched.c		\
 	sched_attr.h	\
diff --git a/configure.ac b/configure.ac
index 7a9abf8..f9ff08e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -376,6 +376,7 @@ AC_CHECK_HEADERS(m4_normalize([
 	linux/fiemap.h
 	linux/genetlink.h
 	linux/hiddev.h
+	linux/if_addr.h
 	linux/ip_vs.h
 	linux/ipc.h
 	linux/mmtimer.h
diff --git a/netlink_route.c b/netlink_route.c
index f6d569b..5e3ed24 100644
--- a/netlink_route.c
+++ b/netlink_route.c
@@ -55,7 +55,13 @@ static const netlink_route_decoder_t route_decoders[] = {
 	[RTM_DELLINK - RTM_BASE] = decode_ifinfomsg,
 	[RTM_GETLINK - RTM_BASE] = decode_ifinfomsg,
 	[RTM_NEWLINK - RTM_BASE] = decode_ifinfomsg,
-	[RTM_SETLINK - RTM_BASE] = decode_ifinfomsg
+	[RTM_SETLINK - RTM_BASE] = decode_ifinfomsg,
+
+	[RTM_DELADDR - RTM_BASE] = decode_ifaddrmsg,
+	[RTM_GETADDR - RTM_BASE] = decode_ifaddrmsg,
+	[RTM_GETANYCAST - RTM_BASE] = decode_ifaddrmsg,
+	[RTM_GETMULTICAST - RTM_BASE] = decode_ifaddrmsg,
+	[RTM_NEWADDR - RTM_BASE] = decode_ifaddrmsg
 };
 
 bool
diff --git a/netlink_route.h b/netlink_route.h
index cc2b5c2..f644d61 100644
--- a/netlink_route.h
+++ b/netlink_route.h
@@ -39,6 +39,7 @@ route_decode_name(struct tcb *tcp,			\
 		  unsigned int len)			\
 /* End of DECL_NETLINK_ROUTE_DECODER definition. */
 
+extern DECL_NETLINK_ROUTE_DECODER(decode_ifaddrmsg);
 extern DECL_NETLINK_ROUTE_DECODER(decode_ifinfomsg);
 
 #endif /* !STRACE_NETLINK_ROUTE_H */
diff --git a/rtnl_addr.c b/rtnl_addr.c
new file mode 100644
index 0000000..a8de521
--- /dev/null
+++ b/rtnl_addr.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"
+#include "netlink_route.h"
+#include "print_fields.h"
+
+#ifdef HAVE_LINUX_IF_ADDR_H
+# include <linux/if_addr.h>
+#endif
+
+#include "xlat/ifaddrflags.h"
+
+DECL_NETLINK_ROUTE_DECODER(decode_ifaddrmsg)
+{
+	struct ifaddrmsg ifaddr = { .ifa_family = family };
+	const size_t offset = sizeof(ifaddr.ifa_family);
+
+	PRINT_FIELD_XVAL("{", ifaddr, ifa_family, addrfams, "AF_???");
+
+	tprints(", ");
+	if (len >= sizeof(ifaddr)) {
+		if (!umoven_or_printaddr(tcp, addr + offset,
+					 sizeof(ifaddr) - offset,
+					 (void *) &ifaddr + offset)) {
+			PRINT_FIELD_U("", ifaddr, ifa_prefixlen);
+			PRINT_FIELD_FLAGS(", ", ifaddr, ifa_flags,
+					  ifaddrflags, "IFA_F_???");
+			PRINT_FIELD_U(", ", ifaddr, ifa_scope);
+			PRINT_FIELD_IFINDEX(", ", ifaddr, ifa_index);
+		}
+	} else
+		tprints("...");
+	tprints("}");
+}
diff --git a/xlat/ifaddrflags.in b/xlat/ifaddrflags.in
new file mode 100644
index 0000000..19df46b
--- /dev/null
+++ b/xlat/ifaddrflags.in
@@ -0,0 +1,12 @@
+IFA_F_SECONDARY
+IFA_F_NODAD
+IFA_F_OPTIMISTIC
+IFA_F_DADFAILED
+IFA_F_HOMEADDRESS
+IFA_F_DEPRECATED
+IFA_F_TENTATIVE
+IFA_F_PERMANENT
+IFA_F_MANAGETEMPADDR
+IFA_F_NOPREFIXROUTE
+IFA_F_MCAUTOJOIN
+IFA_F_STABLE_PRIVACY
-- 
2.7.4