[PATCH 4/4] tests: check decoding of IFLA_XDP netlink attribute of ifinfomsg

[JingPiao Chen]

* tests/nlattr_ifla_xdp.c: New file.
* tests/gen_tests.in (nlattr_ifla_xdp): New entry.
* tests/pure_executables.list: Add nlattr_ifla_xdp.
* tests/.gitignore: Likewise.
---
 tests/.gitignore            |   1 +
 tests/gen_tests.in          |   1 +
 tests/nlattr_ifla_xdp.c     | 112 ++++++++++++++++++++++++++++++++++++++++++++
 tests/pure_executables.list |   1 +
 4 files changed, 115 insertions(+)
 create mode 100644 tests/nlattr_ifla_xdp.c

diff --git a/tests/.gitignore b/tests/.gitignore
index 1594ca8..3d1631e 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -227,6 +227,7 @@ nlattr_ifaddrmsg
 nlattr_ifinfomsg
 nlattr_ifla_brport
 nlattr_ifla_port
+nlattr_ifla_xdp
 nlattr_inet_diag_msg
 nlattr_inet_diag_req_compat
 nlattr_inet_diag_req_v2
diff --git a/tests/gen_tests.in b/tests/gen_tests.in
index 32cf383..8592e28 100644
--- a/tests/gen_tests.in
+++ b/tests/gen_tests.in
@@ -206,6 +206,7 @@ nlattr_ifaddrmsg		+netlink_sock_diag.test
 nlattr_ifinfomsg		+netlink_sock_diag.test
 nlattr_ifla_brport		+netlink_sock_diag.test
 nlattr_ifla_port		+netlink_sock_diag.test
+nlattr_ifla_xdp			+netlink_sock_diag.test
 nlattr_inet_diag_msg		+netlink_sock_diag.test
 nlattr_inet_diag_req_compat	+netlink_sock_diag.test
 nlattr_inet_diag_req_v2		+netlink_sock_diag.test
diff --git a/tests/nlattr_ifla_xdp.c b/tests/nlattr_ifla_xdp.c
new file mode 100644
index 0000000..cca5219
--- /dev/null
+++ b/tests/nlattr_ifla_xdp.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2017 JingPiao Chen <chenjingpiao at gmail.com>
+ * Copyright (c) 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 "tests.h"
+
+#include <stdio.h>
+#include "test_nlattr.h"
+#include <linux/if.h>
+#include <linux/if_arp.h>
+#ifdef HAVE_LINUX_IF_LINK_H
+# include <linux/if_link.h>
+#endif
+#include <linux/rtnetlink.h>
+
+#ifndef IFLA_XDP
+# define IFLA_XDP 43
+#endif
+#ifndef IFLA_XDP_FD
+# define IFLA_XDP_FD 1
+#endif
+
+const unsigned int hdrlen = sizeof(struct ifinfomsg);
+
+static void
+init_ifinfomsg(struct nlmsghdr *const nlh, const unsigned int msg_len)
+{
+	SET_STRUCT(struct nlmsghdr, nlh,
+		.nlmsg_len = msg_len,
+		.nlmsg_type = RTM_GETLINK,
+		.nlmsg_flags = NLM_F_DUMP
+	);
+
+	struct ifinfomsg *const msg = NLMSG_DATA(nlh);
+	SET_STRUCT(struct ifinfomsg, msg,
+		.ifi_family = AF_UNIX,
+		.ifi_type = ARPHRD_LOOPBACK,
+		.ifi_index = ifindex_lo(),
+		.ifi_flags = IFF_UP,
+	);
+
+	struct nlattr *const nla = NLMSG_ATTR(nlh, sizeof(*msg));
+	SET_STRUCT(struct nlattr, nla,
+		.nla_len = msg_len - NLMSG_SPACE(hdrlen),
+		.nla_type = IFLA_XDP
+	);
+}
+
+static void
+print_ifinfomsg(const unsigned int msg_len)
+{
+	printf("{len=%u, type=RTM_GETLINK, flags=NLM_F_DUMP"
+	       ", seq=0, pid=0}, {ifi_family=AF_UNIX"
+	       ", ifi_type=ARPHRD_LOOPBACK"
+	       ", ifi_index=" IFINDEX_LO_STR
+	       ", ifi_flags=IFF_UP, ifi_change=0}"
+	       ", {{nla_len=%u, nla_type=IFLA_XDP}",
+	       msg_len, msg_len - NLMSG_SPACE(hdrlen));
+}
+
+int
+main(void)
+{
+	skip_if_unavailable("/proc/self/fd/");
+
+	const int fd = create_nl_socket(NETLINK_ROUTE);
+	void *nlh0 = tail_alloc(NLMSG_SPACE(hdrlen));
+
+	static char pattern[4096];
+	fill_memory_ex(pattern, sizeof(pattern), 'a', 'z' - 'a' + 1);
+
+	const int32_t num = 0xabacdbcd;
+	TEST_NESTED_NLATTR_OBJECT(fd, nlh0, hdrlen,
+				  init_ifinfomsg, print_ifinfomsg,
+				  IFLA_XDP_FD, pattern, num,
+				  printf("%d", num));
+
+#ifdef XDP_FLAGS_UPDATE_IF_NOEXIST
+	const uint32_t flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
+	TEST_NESTED_NLATTR_OBJECT(fd, nlh0, hdrlen,
+				  init_ifinfomsg, print_ifinfomsg,
+				  IFLA_XDP_FLAGS, pattern, flags,
+				  printf("XDP_FLAGS_UPDATE_IF_NOEXIST"));
+#endif
+
+	puts("+++ exited with 0 +++");
+	return 0;
+}
diff --git a/tests/pure_executables.list b/tests/pure_executables.list
index 91d96c8..dade57b 100755
--- a/tests/pure_executables.list
+++ b/tests/pure_executables.list
@@ -189,6 +189,7 @@ nlattr_ifaddrmsg
 nlattr_ifinfomsg
 nlattr_ifla_brport
 nlattr_ifla_port
+nlattr_ifla_xdp
 nlattr_inet_diag_msg
 nlattr_inet_diag_req_compat
 nlattr_inet_diag_req_v2
-- 
2.7.4