Hi to all in the List,
i figured out that the following code works fine:
if((ntohs(((unsigned int)((struct tcphdr *)(skb->h.th)+1)->source))==20
But!
I can't understand why i have to add the 1 to the Pointer.
Can anyone help me and explain that to me please?
Thank You.
Regards
Andreas Rennen
Andreas Rennen wrote:
>
> if (skb->nh.iph->protocol==6)
> ^^^^^ must be ...->protocol
> x=skb->h.th->source;
>
> I need to fingure out to wich source and destination port a packet goes.
> Thanks to Christoph Mause for his example that can do that:
>
> if (sk->protocol == 6) //Ist das Transportprotokoll TCP?
> {
> s_address = sk->saddr; //Hiermit erhalte die die IP-
> Source Adresse
> d_address = sk->daddr; //Hier die IP- Destination Adresse
> sport = sk->sport; //Somit bekommt man den Source Port
> dport = sk->dport; //und so den Destination Port
> }
> else
> printk(KERN_WARNING "Transportprotokoll ist nicht TCP\n");
>
> My Question is:
> Why is the struct sk_buff h not filled and the pointer of n.th->source
> points to the wrong adress?
> I found the struct in the file sk_buff.h and there is the union h defined.
> Why is it defined but not used?
> Perhaps i have a wrong kernel-config?
>
> Thank you for further help.
>
> Regards
> Andreas Rennen
>
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