Make the client and server IPv6 aware

README

@@ -452,5 +452,17 @@ How do I disable friendly fire in coop mode?
    open the console and type "dmflags 336" für skinbased teamplay and 
    "dmflags 400" for modelbased teamplay.
 
+Can I connect to an IPv6 server?
+ - Yes, the same way as connecting to an IPv4 server. Since the Quake II
+   console has problems with the characters ":", "[" and "]" we suggest
+   to submit the connection command as command line argument:
+     ./quake2 +connect "[2001:db8::1]"
+   For your server to show up in the server list you need to supply a 
+   multicast interface to both the client and the server:
+     ./q2ded +set multicast eth0
+     ./quake2 +set multicast eth0
+   Normaly the server will listen to all IPv4 and IPv6 addresses. You
+   can bind it to an address with:
+     ./q2ded +set ip "[2001:db8::1]"
 
-===============================================================================
+==============================================================================

src/client/cl_network.c

@@ -456,6 +456,11 @@ void CL_PingServers_f (void)
 		adr.type = NA_BROADCAST;
 		adr.port = BigShort(PORT_SERVER);
 		Netchan_OutOfBandPrint (NS_CLIENT, adr, va("info %i", PROTOCOL_VERSION));
+
+		Com_Printf ("pinging multicast...\n");
+		adr.type = NA_MULTICAST6;
+		adr.port = BigShort(PORT_SERVER);
+		Netchan_OutOfBandPrint (NS_CLIENT, adr, va("info %i", PROTOCOL_VERSION));
 	}
 
 	noipx = Cvar_Get ("noipx", "0", CVAR_NOSET);

src/client/menu/menu.c

@@ -2165,7 +2165,7 @@ void M_AddToServerList (netadr_t adr, char *info) {
 			return;
 
 	local_server_netadr[m_num_servers] = adr;
-	snprintf (local_server_names[m_num_servers], sizeof(local_server_names[m_num_servers])-1, "%d. %s", m_num_servers+1, info);
+	Com_sprintf(local_server_names[m_num_servers], sizeof(local_server_names[0])-1, "%s %s", info, NET_AdrToString(adr));
 	m_num_servers++;
 }
 

src/common/header/common.h

@@ -456,14 +456,24 @@ extern	qboolean	userinfo_modified;
 #define	MAX_MSGLEN		1400		/* max length of a message */
 #define	PACKET_HEADER	10			/* two ints and a short */
 
-typedef enum {NA_LOOPBACK, NA_BROADCAST, NA_IP, NA_IPX, NA_BROADCAST_IPX} netadrtype_t;
+typedef enum 
+{
+	NA_LOOPBACK, 
+	NA_BROADCAST, 
+	NA_IP, 
+	NA_IPX, 
+	NA_BROADCAST_IPX, 
+	NA_IP6, 
+	NA_MULTICAST6
+} netadrtype_t;
 
 typedef enum {NS_CLIENT, NS_SERVER} netsrc_t;
 
 typedef struct
 {
 	netadrtype_t	type;
-	byte	ip[4];
+	byte	ip[16];
+	unsigned int scope_id;
 	byte	ipx[10];
 
 	unsigned short	port;