Ethernet stuff moved to separated header file

Reworked IP addresses translation functions
Centralized initializing of random number generator

src/ethernet.h

@@ -0,0 +1,34 @@
+/*
+ *  WrapSix
+ *  Copyright (C) 2008-2011  Michal Zima <xhire@mujmalysvet.cz>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as
+ *  published by the Free Software Foundation, either version 3 of the
+ *  License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ETHERNET_H
+#define ETHERNET_H
+
+/* MAC address structure */
+struct s_mac_addr {
+	unsigned char		addr[6];
+} __attribute__ ((__packed__));
+
+/* Ethernet header structure */
+struct s_ethernet {
+	struct s_mac_addr	dest;	/* 48 b; destination host (MAC) address */
+	struct s_mac_addr	src;	/* 48 b; source host (MAC) address */
+	unsigned short		type;	/* 16 b; IP/ARP/RARP/... */
+} __attribute__ ((__packed__));
+
+#endif /* ETHERNET_H */