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how to interpret C statement?

To: netdev@xxxxxxxxxxx
Subject: how to interpret C statement?
From: linux lover <linux_lover2004@xxxxxxxxx>
Date: Tue, 8 Jun 2004 08:44:12 -0700 (PDT)
Sender: netdev-bounce@xxxxxxxxxxx
how to interpret following C statement?
#define TCP_SKB_CB(__skb)       ((struct tcp_skb_cb *)&((__skb)->cb[0]))
what is use of tcp_skb_cb structure in kernel source tcp.h? how TCP_SKB_CB(skb) is translated in its definition?

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