can: Add can_common.h for vcan device setup

Signed-off-by: Richard Palethorpe <rpalethorpe@suse.com>
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>

1 files changed, 71 insertions, 0 deletions

diff --git a/testcases/network/can/filter-tests/can_common.h b/testcases/network/can/filter-tests/can_common.h
new file mode 100644
index 000000000..af0cf5f00
--- /dev/null
+++ b/testcases/network/can/filter-tests/can_common.h
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2021 SUSE LLC
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+
+#include "tst_cmd.h"
+#include "tst_safe_stdio.h"
+#include "tst_safe_file_ops.h"
+
+#include <linux/if.h>
+#include <linux/can.h>
+#include <linux/can/raw.h>
+
+static char *can_dev_name;
+static int can_created_dev;
+
+static void can_cmd(const char *const argv[])
+{
+	tst_cmd(argv, NULL, NULL, TST_CMD_TCONF_ON_MISSING);
+}
+
+#define CAN_CMD(...) can_cmd((const char *const[]){ __VA_ARGS__, NULL })
+
+static void can_setup_vcan(void)
+{
+	unsigned int flags;
+	char *path;
+
+	if (can_dev_name)
+		goto check_echo;
+
+	can_dev_name = "vcan0";
+
+	tst_res(TINFO, "Creating vcan0 device; use -D option to avoid this");
+
+	CAN_CMD("modprobe", "-r", "vcan");
+	CAN_CMD("modprobe", "vcan", "echo=1");
+
+	can_created_dev = 1;
+
+	CAN_CMD("ip", "link", "add", "dev", "vcan0", "type", "vcan");
+	CAN_CMD("ip", "link", "set", "dev", "vcan0", "up");
+
+check_echo:
+	SAFE_ASPRINTF(&path, "/sys/class/net/%s/flags", can_dev_name);
+	if (FILE_SCANF(path, "%x", &flags) || !(flags & IFF_ECHO)) {
+		tst_res(TWARN,
+			"Could not determine if ECHO is set on %s. This may effect code coverage.",
+			can_dev_name);
+	}
+}
+
+static void can_cleanup_vcan(void)
+{
+	if (!can_created_dev)
+		return;
+
+	CAN_CMD("ip", "link", "set", "dev", "vcan0", "down");
+	CAN_CMD("ip", "link", "del", "dev", "vcan0");
+	CAN_CMD("modprobe", "-r", "vcan");
+}