On Thursday 2009-01-22 17:54, Vladimir Kobylyanskiy wrote:
>
>> Very well. But there still is another case I can think of -
>> non-linear skb.
>> struct tcphdr tcpbuf;
>> const struct tcphdr *th;
>>
>> th = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(tcpbuf), &tcpbuf);
>> if (th->psh && ntohs(tcp->dest) == 80) {
>> char n[4];
>> if (skb_copy_bits(skb, ip_hdrlen(skb) + 4*tcp->doff,
>> n, sizeof(n)) >= 0)
>> printk("data: %02x %02x %02x %02x\n", n[0], n[1],
>> n[2], n[3]);
>> }
>
>Yes! It is non-linear skb! All works! THANK YOU VERY MUCH!
>I try to fix this bug for about 2 weeks. And You fix it for 15 minutes!
>Non of my books tell me about non-linear skb.
I suggest my very own
http://jengelh.medozas.de/Netfilter_Modules.pdf
supplemental to that one might want to read "Linux Networking Internals"
as published by O'Reilly, though, it is based on 2.6.14 and one needs
to think a fair bit to make it applicable to 14 releases later that we
had.
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