My example was of course wrong:
the hint from Gigi Sullivan was correct - Thanks
if (skb->nh.iph->saddr==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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