Re: sk_buff checksum

["Nebi Senol Yilmaz" <nsyilmaz@xxxxxxxxx>]

sorry,

i'm sending the hook function, where i'm doing everything.

============



unsigned int hook_pool(unsigned int hooknum,
				struct sk_buff **skb,
				const struct net_device *in,
				const struct net_device *out,
				int (*okfn)(struct sk_buff*)){



	struct tcphdr *tcp;
	char *data;
	struct sk_buff *sock_buff;
	int i=0;
	char *findGzip;

	sock_buff=*skb;

	tcp = (struct tcphdr *)(sock_buff->data + (sock_buff->nh.iph->ihl * 4));
	data = (char *)((int)tcp + (int)(tcp->doff * 4));


	if (findGzip=(strstr(data,"senol1763"))){
		printk("%d Data CheckSum 1 = %u\n",hooknum,sock_buff->csum);
		printk("%d TCP CheckSum 1 = %u\n",hooknum,sock_buff->h.th->check);
		printk("%d IP CheckSum 1 = %u\n",hooknum,sock_buff->nh.iph->check);
		printk("\n");

		findGzip[1]='n';
/* here, i'm calculating ne csum.*/
sock_buff->h.th->check=0;
sock_buff->h.th->check=in_cksum_tcp(sock_buff->nh.iph->saddr,sock_buff->nh.iph->daddr,(unsigned
short *)sock_buff->h.th , sizeof(*sock_buff->h.th) );

         }

return NF_ACCEPT;
}	


==============


yes that's all what i'm doing.

as i write a csum calculation code (i'm not so sure) above, i've tried
so many csum calculations. but same fault i'm still in.

do i forget something, or doing something wrong?



thanks for your interest.


-
senol




On 3/8/06, Arjan van de Ven <arjan@xxxxxxxxxxxxx> wrote:
>
> > does anybody know about my problem? can you give me some advice
> > whether you have  any solutions about it.
>
>
> somehow I doubt people can help you since you forgot to attach your
> source code (or put a URL to it in)
>
>

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