TCP_SKB_CB question

[rahul b jain cs student]

Hi,

I was trying to modify the file ip_input.c. I created a new function of my
own in that file. This function has the following declaration

int switch_check(struct sk_buff *skb)

Within this function I am trying to read the ack value as follows

__u32 ack_value = TCP_SKB_CB(skb)->ack_seq;

However I am getting the following compile errors when I try to recompile
the kernel.

warning: implicit declaration of function TCP_SKB_CB
error: invalid type arguement of ->

Can someone point me where I went wrong.

Thanks,
Rahul.
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