[CCID3]: Introduce include/linux/tfrc.h

Moving the TFRC sender and receiver variables to separate structs, so
that we can copy these structs to userspace thru getsockopt,
dccp_diag, etc.
Signed-off-by: NArnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/linux/tfrc.h

+#ifndef _LINUX_TFRC_H_
+#define _LINUX_TFRC_H_
+/*
+ *  include/linux/tfrc.h
+ *
+ *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
+ *  Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
+ *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ *  Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ */
+
+#include <linux/types.h>
+
+struct tfrc_rx_info {
+  	__u32 tfrcrx_x_recv;
+	__u32 tfrcrx_rtt;
+  	__u32 tfrcrx_p;
+};
+
+struct tfrc_tx_info {
+	__u32 tfrctx_x;
+	__u32 tfrctx_x_recv;
+	__u32 tfrctx_x_calc;
+	__u32 tfrctx_rtt;
+	__u32 tfrctx_p;
+	__u32 tfrctx_rto;
+	__u32 tfrctx_ipi;
+};
+
+#endif /* _LINUX_TFRC_H_ */

net/dccp/ccids/ccid3.h

@@ -40,6 +40,7 @@
 #include <linux/list.h>
 #include <linux/time.h>
 #include <linux/types.h>
+#include <linux/tfrc.h>
 
 #define TFRC_MIN_PACKET_SIZE	   16
 #define TFRC_STD_PACKET_SIZE	  256
@@ -93,12 +94,15 @@ struct ccid3_options_received {
   * @ccid3hctx_hist - Packet history
   */
 struct ccid3_hc_tx_sock {
-	u32				ccid3hctx_x;
-	u32				ccid3hctx_x_recv;
-	u32				ccid3hctx_x_calc;
+	struct tfrc_tx_info		ccid3hctx_tfrc;
+#define ccid3hctx_x			ccid3hctx_tfrc.tfrctx_x
+#define ccid3hctx_x_recv		ccid3hctx_tfrc.tfrctx_x_recv
+#define ccid3hctx_x_calc		ccid3hctx_tfrc.tfrctx_x_calc
+#define ccid3hctx_rtt			ccid3hctx_tfrc.tfrctx_rtt
+#define ccid3hctx_p			ccid3hctx_tfrc.tfrctx_p
+#define ccid3hctx_t_rto			ccid3hctx_tfrc.tfrctx_rto
+#define ccid3hctx_t_ipi			ccid3hctx_tfrc.tfrctx_ipi
 	u16				ccid3hctx_s;
-	u32				ccid3hctx_rtt;
-	u32				ccid3hctx_p;
   	u8				ccid3hctx_state;
 	u8				ccid3hctx_last_win_count;
 	u8				ccid3hctx_idle;
@@ -106,19 +110,19 @@ struct ccid3_hc_tx_sock {
 	struct timer_list		ccid3hctx_no_feedback_timer;
 	struct timeval			ccid3hctx_t_ld;
 	struct timeval			ccid3hctx_t_nom;
-	u32				ccid3hctx_t_rto;
-	u32				ccid3hctx_t_ipi;
 	u32				ccid3hctx_delta;
 	struct list_head		ccid3hctx_hist;
 	struct ccid3_options_received	ccid3hctx_options_received;
 };
 
 struct ccid3_hc_rx_sock {
+	struct tfrc_rx_info	ccid3hcrx_tfrc;
+#define ccid3hcrx_x_recv	ccid3hcrx_tfrc.tfrcrx_x_recv
+#define ccid3hcrx_rtt		ccid3hcrx_tfrc.tfrcrx_rtt
+#define ccid3hcrx_p		ccid3hcrx_tfrc.tfrcrx_p
   	u64			ccid3hcrx_seqno_last_counter:48,
 				ccid3hcrx_state:8,
 				ccid3hcrx_last_counter:4;
-	u32			ccid3hcrx_rtt;
-  	u32			ccid3hcrx_p;
   	u32			ccid3hcrx_bytes_recv;
   	struct timeval		ccid3hcrx_tstamp_last_feedback;
   	struct timeval		ccid3hcrx_tstamp_last_ack;
@@ -127,7 +131,6 @@ struct ccid3_hc_rx_sock {
   	u16			ccid3hcrx_s;
   	u32			ccid3hcrx_pinv;
   	u32			ccid3hcrx_elapsed_time;
-  	u32			ccid3hcrx_x_recv;
 };
 
 static inline struct ccid3_hc_tx_sock *ccid3_hc_tx_sk(const struct sock *sk)