selftests: fixup headers

Also remove the stale entry from the TODO list.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

TODO.md

@@ -7,7 +7,6 @@
 - Work out `priv_check` from vnet perspective. (There's no `ns_capable()` on
   FreeBSD, just `capable()`, which makes it a bit weird for one jail to have
   permissions in another.)
-- Port ratelimiter and counter [selftests](https://git.zx2c4.com/wireguard-linux/tree/drivers/net/wireguard/selftest).
 - Make code style consistent with one FreeBSD way, rather than a mix of styles.
 - Run ratelimiter gc in a properly scheduled manner.
 - Make sure noise state machine is correct.

src/selftest/allowedips.c

@@ -1,17 +1,8 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
+/* SPDX-License-Identifier: MIT
+ *
  * Copyright (C) 2015-2021 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
  */
 
-#include <sys/cdefs.h>
-#include <sys/param.h>
-#include <sys/types.h>
-#include <sys/systm.h>
-#include <sys/queue.h>
-#include <sys/endian.h>
-#include <netinet/in.h>
-#include <net/radix.h>
-
 #ifdef WG_ALLOWEDIPS_RANDOMIZED_TEST
 enum {
 	NUM_PEERS = 2000,

src/selftest/cookie.c

@@ -1,3 +1,9 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2015-2021 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * Copyright (C) 2019-2021 Matt Dunwoodie <ncon@noconroy.net>
+ */
+
 #define MESSAGE_LEN 64
 #define T_FAILED_ITER(test) do {				\
 	printf("%s %s: fail, iter: %d\n", __func__, test, i);	\

src/selftest/counter.c

@@ -1,3 +1,9 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2015-2021 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * Copyright (C) 2019-2021 Matt Dunwoodie <ncon@noconroy.net>
+ */
+
 #define T_LIM (COUNTER_WINDOW_SIZE + 1)
 #define T_INIT do {				\
 	bzero(&kp, sizeof(kp));			\