extern int tcp_sendpage(struct sock *sk, struct page *page, int offset,
size_t size, int flags);
extern void tcp_release_cb(struct sock *sk);
+extern void tcp_wfree(struct sk_buff *skb);
extern void tcp_write_timer_handler(struct sock *sk);
extern void tcp_delack_timer_handler(struct sock *sk);
extern int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg);