Change In sk_buff structure in 2.6.22 kernel

Change In sk_buff structure in 2.6.22 kernel

[PV Juliet]

Hi All,


The header fields in the sk_buff structure have been renamed and are
no longer unions.

Networking code and drivers are supposed to use skb->transport_header,
skb->network_header, and skb->skb_mac_header.
But when I am trying to access fields of TCP using the code
struct tcphdr *tcp = skb->transport_header;
tcp->   //accessing proper field
It is not accessing the value properly ...
Can anyone please help me ???


Thanks in advance
Regards
Juliet

Re: Change In sk_buff structure in 2.6.22 kernel

[Stephen Hemminger]

On Wed, 30 Jan 2008 10:49:49 +0530
"PV Juliet" <pvjuliet@gmail.com> wrote:

> Hi All,
> 
> 
> The header fields in the sk_buff structure have been renamed and are
> no longer unions.
> 
> Networking code and drivers are supposed to use skb->transport_header,
> skb->network_header, and skb->skb_mac_header.
> But when I am trying to access fields of TCP using the code
> struct tcphdr *tcp = skb->transport_header;
> tcp->   //accessing proper field
> It is not accessing the value properly ...
> Can anyone please help me ???
> 
> 
> Thanks in advance
> Regards
> Juliet

Read the source (include/linux/skbuff.h)

Use the new accessor functions skb_transport_header(skb), skb_network_header(skb),


-- 
Stephen Hemminger <stephen.hemminger@vyatta.com>

Re: Change In sk_buff structure in 2.6.22 kernel

[Herbert Xu]

Stephen Hemminger <shemminger@linux-foundation.org> wrote:
>
>> Networking code and drivers are supposed to use skb->transport_header,
>> skb->network_header, and skb->skb_mac_header.
>> But when I am trying to access fields of TCP using the code
>> struct tcphdr *tcp = skb->transport_header;
>> tcp->   //accessing proper field
>> It is not accessing the value properly ...
>> Can anyone please help me ???
>
> Use the new accessor functions skb_transport_header(skb), skb_network_header(skb),

There are also protocol helpers like tcp_hdr.

Cheers,
-- 
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