Re: Quake Masquerading Module

William Sowerbutts (btg@thepentagon.com)
Sun, 23 Feb 1997 10:54:11 +0000

At 05:01 23/02/97 +0100, Harald Hoyer wrote:
>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!
>
> [snip]
>
>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;

Shouldn't this read "iph = skb->h.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;
>}

At least, that's the way it works for my 2.0.29 kernel.
_________________________________________________________________________
William R Sowerbutts (BtG) btg@thepentagon.com
Coder / Guru / Nrrrd http://www.users.dircon.co.uk/~guru/
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