[Click] tcp->thdport and udp->uh_dport not returning correct values

[Roman Chertov]

You can also take a look here how to access the headers if the 
annotations have not been set

https://github.com/kohler/click/blob/master/elements/analysis/storeudptimeseqrecord.cc


Roman
On 05/13/2011 07:05 AM, Beyers Cronje wrote:
> You probably forgot to convert to host byte order:
>
> src_port = ntohs(tcp->th_sport);
>
> The way you are assigning your pointers are also prone to errors.
>
> A better way would be something in the lines of:
>
>    const click_ip6 *ip6h = p->ip6_header();
>    const click_tcp *tcph = p->tcp_header();
>
>    if (!p->has_network_header()) {
>        p->kill();
>        return;
>    }
>
>    // Do your stuff here
>
>
> The above code assumes that you have used the proper Click configuration to
> ensure IPv6 packets via Classifier and that the packets are passed through
> MarkIP6Header or CheckIP6Header so that the proper packet header annotations
> are set.
>
> Beyers
>
>
>
> On Fri, May 13, 2011 at 3:33 PM, milos rovcanin<ro1208984 at gmail.com>  wrote:
>
>> Greetings,
>>
>> Like it's said in the subject, this code:
>>
>> click_ether * eth = (click_ether *)p->data();
>> click_ip6 * ip6 = (click_ip6 *)(eth+1);
>>
>>   if(ip6->ip6_nxt == 6) {
>>    click_tcp* tcp = (click_tcp*)(ip6+1);
>>    src_port = tcp->th_sport;
>>    dst_port = tcp->th_dport;
>> }
>>
>> just won't return correct values for dst_port and src_port! I have checked
>> it in Wireshark too.
>> What am I doing wrong?
>>
>> Thanks in advance!
>> --
>> Milos Rovcanin
>> Department of Information Technology
>> Internet Based Communication Networks and Services research group (IBCN)
>> Ghent University - IBBT
>> Gaston Crommenlaan 8 (Bus 201), B-9050 Gent, Belgium
>> T: +32 9 33 14946 ; T Secr: +32 9 33 14900
>> E: Milos.Rovcanin at intec.UGent.be
>> W: www.ibcn.intec.UGent.be
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>>
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