1 files changed, 110 insertions, 0 deletions
diff --git a/tools/testing/selftests/net/netlink-dumps.c b/tools/testing/selftests/net/netlink-dumps.c
new file mode 100644
index 000000000000..7ee6dcd334df
--- /dev/null
+++ b/tools/testing/selftests/net/netlink-dumps.c
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#define _GNU_SOURCE
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <linux/genetlink.h>
+#include <linux/netlink.h>
+#include <linux/mqueue.h>
+
+#include "../kselftest_harness.h"
+
+static const struct {
+	struct nlmsghdr nlhdr;
+	struct genlmsghdr genlhdr;
+	struct nlattr ahdr;
+	__u16 val;
+	__u16 pad;
+} dump_policies = {
+	.nlhdr = {
+		.nlmsg_len	= sizeof(dump_policies),
+		.nlmsg_type	= GENL_ID_CTRL,
+		.nlmsg_flags	= NLM_F_REQUEST | NLM_F_ACK | NLM_F_DUMP,
+		.nlmsg_seq	= 1,
+	},
+	.genlhdr = {
+		.cmd		= CTRL_CMD_GETPOLICY,
+		.version	= 2,
+	},
+	.ahdr = {
+		.nla_len	= 6,
+		.nla_type	= CTRL_ATTR_FAMILY_ID,
+	},
+	.val = GENL_ID_CTRL,
+	.pad = 0,
+};
+
+// Sanity check for the test itself, make sure the dump doesn't fit in one msg
+TEST(test_sanity)
+{
+	int netlink_sock;
+	char buf[8192];
+	ssize_t n;
+
+	netlink_sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
+	ASSERT_GE(netlink_sock, 0);
+
+	n = send(netlink_sock, &dump_policies, sizeof(dump_policies), 0);
+	ASSERT_EQ(n, sizeof(dump_policies));
+
+	n = recv(netlink_sock, buf, sizeof(buf), MSG_DONTWAIT);
+	ASSERT_GE(n, sizeof(struct nlmsghdr));
+
+	n = recv(netlink_sock, buf, sizeof(buf), MSG_DONTWAIT);
+	ASSERT_GE(n, sizeof(struct nlmsghdr));
+
+	close(netlink_sock);
+}
+
+TEST(close_in_progress)
+{
+	int netlink_sock;
+	ssize_t n;
+
+	netlink_sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
+	ASSERT_GE(netlink_sock, 0);
+
+	n = send(netlink_sock, &dump_policies, sizeof(dump_policies), 0);
+	ASSERT_EQ(n, sizeof(dump_policies));
+
+	close(netlink_sock);
+}
+
+TEST(close_with_ref)
+{
+	char cookie[NOTIFY_COOKIE_LEN] = {};
+	int netlink_sock, mq_fd;
+	struct sigevent sigev;
+	ssize_t n;
+
+	netlink_sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
+	ASSERT_GE(netlink_sock, 0);
+
+	n = send(netlink_sock, &dump_policies, sizeof(dump_policies), 0);
+	ASSERT_EQ(n, sizeof(dump_policies));
+
+	mq_fd = syscall(__NR_mq_open, "sed", O_CREAT | O_WRONLY, 0600, 0);
+	ASSERT_GE(mq_fd, 0);
+
+	memset(&sigev, 0, sizeof(sigev));
+	sigev.sigev_notify		= SIGEV_THREAD;
+	sigev.sigev_value.sival_ptr	= cookie;
+	sigev.sigev_signo		= netlink_sock;
+
+	syscall(__NR_mq_notify, mq_fd, &sigev);
+
+	close(netlink_sock);
+
+	// give mqueue time to fire
+	usleep(100 * 1000);
+}
+
+TEST_HARNESS_MAIN