C++ structure for IPV6 Header ..

Question

3.00/5 (2 votes)

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Hi,

Could any one please give me C++ structure for IPV6 Header ..
Fields are :
Version : 4 bits
Traffic Class : 8 Bits
Flow Label : 20 Bits
PayLoadLength : 16 Bits
Next Header : 8 Bits
Hop Limit : 8 Bits
Source IPv6 Address : 128 Bits
Destination IPv6 Address : 128 Bits

Regards
Lakkan

Posted 26-Jan-12 0:39am

Lakkan

Updated 26-Jan-12 0:41am

v3

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Lakkan 27-Jan-12 4:00am

which datatype I have to use for to represent 20 Bits.. similarly 128 Bits..
could you plese help me on this..

4 solutions

Solution 1

See here[^] for sample code on using bit fields in C++ structs.

Posted 26-Jan-12 0:49am

Richard MacCutchan

Solution 2

What is, exactly your trouble?
If the posted ones are your exact requirements (there isn't an already defined struct for this, is there?), then the coding is just straightforward:

C++

struct IPV6header
{
  u_int version: 4;
  u_int traffic_class: 8;
  // ... and so on ...
  u_char source_addr[16];
  u_char dest_addr[16];
};

Posted 26-Jan-12 0:54am

CPallini

Updated 26-Jan-12 0:56am

v2

Comments

Richard MacCutchan 26-Jan-12 7:03am

I think your bit fields may be in the wrong order ...

CPallini 26-Jan-12 7:14am

It depends on requirements.

Richard MacCutchan 26-Jan-12 7:19am

That is true.

Solution 3

which datatype I have to use to represent 20 Bits.. similarly 128 Bits..
could you plese help me on this..

Posted 26-Jan-12 22:01pm

Lakkan

Comments

Richard MacCutchan 27-Jan-12 4:44am

Did you look at the link I gave you which showed exactly how to represent bit fields in structures? Did you also check CPallini's answer which shows you how to represent 128 bits (hint: how many bytes is that?).

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Sergey Chepurin · Accepted Answer · 2012-01-26T23:00:00

Solution 4

It never hurts to ask Google: ipv6.c - IP header information[^]

Posted 26-Jan-12 23:00pm

Sergey Chepurin

Comments

Lakkan 27-Jan-12 6:14am

I Thank you all for your info..