1 files changed, 56 insertions, 0 deletions
diff --git a/src/support.h b/src/support.h
new file mode 100644
index 0000000..f613f40
--- /dev/null
+++ b/src/support.h
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: ISC
+ *
+ * Copyright (C) 2021 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * Copyright (C) 2021 Matt Dunwoodie <ncon@noconroy.net>
+ */
+
+#ifndef _WG_SUPPORT
+#define _WG_SUPPORT
+
+#include <sys/types.h>
+#include <sys/limits.h>
+#include <sys/endian.h>
+#include <sys/libkern.h>
+#include <sys/malloc.h>
+#include <sys/proc.h>
+#include <sys/lock.h>
+#include <vm/uma.h>
+
+/* TODO the following is openbsd compat defines to allow us to copy the wg_*
+ * files from openbsd (almost) verbatim. this will greatly increase maintenance
+ * across the platforms. it should be moved to it's own file. the only thing
+ * we're missing from this is struct pool (freebsd: uma_zone_t), which isn't a
+ * show stopper, but is something worth considering in the future.
+ *  - md */
+
+#define rw_assert_wrlock(x) rw_assert(x, RA_WLOCKED)
+#define rw_enter_write rw_wlock
+#define rw_exit_write rw_wunlock
+#define rw_enter_read rw_rlock
+#define rw_exit_read rw_runlock
+#define rw_exit rw_unlock
+
+#define RW_DOWNGRADE 1
+#define rw_enter(x, y) do {		\
+	CTASSERT(y == RW_DOWNGRADE);	\
+	rw_downgrade(x);		\
+} while (0)
+
+MALLOC_DECLARE(M_WG);
+
+#include <crypto/siphash/siphash.h>
+typedef struct {
+	uint64_t	k0;
+	uint64_t	k1;
+} SIPHASH_KEY;
+
+static inline uint64_t
+siphash24(const SIPHASH_KEY *key, const void *src, size_t len)
+{
+	SIPHASH_CTX ctx;
+
+	return (SipHashX(&ctx, 2, 4, (const uint8_t *)key, src, len));
+}
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
+#endif