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SubjectQuake Masquerading Module
Date
HI,

This quick hack to play Quake over the net with Masquerading-Support.
I know that the initial Datastream has to be checked against
a string like "\200\0\0\f\1QUAKE\0\3", but it's to late now and I have
to study a lot in the next weeks.

The File ip_masq_quake.c is attached. You may put it in your
/usr/src/linux/net/ipv4 Directory, add ip_masq_quake.o to the other
Masquerading-Modules in the Makefile, compile, load the module
and stomp the other players to the ground!

Keep on hacking,
Harald
--
Harald Hoyer
saturn@studbox.uni-stuttgart.de
http://saturnnet.wh.uni-stuttgart.de/~saturn
-------------------------------------------------------------------------
> Someone:
> Asking Linus to add such things in the kernel is as pertinent as asking
> to still support 80286 CPU (IMHO).
We are working on it.
Alan Cox
/*
* IP_MASQ_QUAKE quake masquerading module
*
*
* Version: @(#)ip_masq_quake.c 0.01 22/02/97
*
* Author: Harald Hoyer
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/

#include <linux/module.h>
#include <asm/system.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <net/protocol.h>
#include <net/tcp.h>
#include <net/ip_masq.h>


static int
masq_quake_init_1 (struct ip_masq_app *mapp, struct ip_masq *ms)
{
MOD_INC_USE_COUNT;
return 0;
}

static int
masq_quake_done_1 (struct ip_masq_app *mapp, struct ip_masq *ms)
{
MOD_DEC_USE_COUNT;
return 0;
}

int
masq_quake_in (struct ip_masq_app *mapp, struct ip_masq *ms, struct sk_buff **skb_p, struct device *dev)
{
struct sk_buff *skb;
struct iphdr *iph;
__u16 *portptr, s_port;

if(!(ms->flags & IP_MASQ_F_NO_DPORT))
return 0;

skb = *skb_p;
iph = skb->nh.iph;

portptr = (__u16 *)&(((char *)iph)[iph->ihl*4]);
s_port = portptr[0];

if(s_port == ms->dport)
return 0;

ms->dport = s_port;
ms->flags &= ~IP_MASQ_F_NO_DPORT;

return 0;
}

int
masq_quake_out (struct ip_masq_app *mapp, struct ip_masq *ms, struct sk_buff **skb_p, struct device *dev)
{
/* SHOULD CHECK DATA "\200\0\0\f\1QUAKE\0\3" or something like that */

if(!(ms->flags & IP_MASQ_F_NO_DPORT)) {
ms->flags |= IP_MASQ_F_NO_DPORT;
}

return 0;
}

struct ip_masq_app ip_masq_quake = {
NULL, /* next */
"Quake_26", /* name */
0, /* type */
0, /* n_attach */
masq_quake_init_1, /* ip_masq_init_1 */
masq_quake_done_1, /* ip_masq_done_1 */
masq_quake_out, /* pkt_out */
masq_quake_in /* pkt_in */
};
struct ip_masq_app ip_masq_quakenew = {
NULL, /* next */
"Quake_27", /* name */
0, /* type */
0, /* n_attach */
masq_quake_init_1, /* ip_masq_init_1 */
masq_quake_done_1, /* ip_masq_done_1 */
masq_quake_out, /* pkt_out */
masq_quake_in /* pkt_in */
};

/*
* ip_masq_quake initialization
*/

int ip_masq_quake_init(void)
{
return (register_ip_masq_app(&ip_masq_quake, IPPROTO_UDP, 26000) +
register_ip_masq_app(&ip_masq_quakenew, IPPROTO_UDP, 27000));
}

/*
* ip_masq_quake fin.
*/

int ip_masq_quake_done(void)
{
return (unregister_ip_masq_app(&ip_masq_quake) +
unregister_ip_masq_app(&ip_masq_quakenew));
}

#ifdef MODULE

int init_module(void)
{
if (ip_masq_quake_init() != 0)
return -EIO;
register_symtab(0);
return 0;
}

void cleanup_module(void)
{
if (ip_masq_quake_done() != 0)
printk("ip_masq_quake: can't remove module");
}

#endif /* MODULE */


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