net: use common rand()/srand() functions
Replace rand() with the functions from lib/. The link-local network code
stores its own seed, derived from the MAC address. Thus making it
independent from calls to srand() in other modules.
Signed-off-by: Michael Walle <michael@walle.cc>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/net/net_rand.h b/net/net_rand.h
index c98db64..ba9d064 100644
--- a/net/net_rand.h
+++ b/net/net_rand.h
@@ -9,18 +9,35 @@
#ifndef __NET_RAND_H__
#define __NET_RAND_H__
-#define RAND_MAX 0xffffffff
+#include <common.h>
/*
- * Seed the random number generator using the eth0 MAC address
+ * Return a seed for the PRNG derived from the eth0 MAC address.
*/
-void srand_mac(void);
+static inline unsigned int seed_mac(void)
+{
+ unsigned char enetaddr[6];
+ unsigned int seed;
+
+ /* get our mac */
+ eth_getenv_enetaddr("ethaddr", enetaddr);
+
+ seed = enetaddr[5];
+ seed ^= enetaddr[4] << 8;
+ seed ^= enetaddr[3] << 16;
+ seed ^= enetaddr[2] << 24;
+ seed ^= enetaddr[1];
+ seed ^= enetaddr[0] << 8;
+
+ return seed;
+}
/*
- * Get a random number (after seeding with MAC address)
- *
- * @return random number
+ * Seed the random number generator using the eth0 MAC address.
*/
-unsigned long rand(void);
+static inline void srand_mac(void)
+{
+ srand(seed_mac());
+}
#endif /* __NET_RAND_H__ */
