[DCCP]: Introduce dccp_tfrc_lib module with net/dccp/ccids/lib/*.c

I'll now take a look at the other proposed TFRC DCCP CCIDs to find
more code that is now in ccid3.c and move to this module, the loss
event rate, calc_X, etc most probably will be moved there.

The main goal of these changes is to pave the way for the
implementation of more TFRC based DCCP CCIDs and to shrink ccid3.c,
reducing its complexity and helping in getting it rock solid.
Signed-off-by: NArnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/dccp/ccids/Kconfig

@@ -22,4 +22,8 @@ config IP_DCCP_CCID3
 	  
 	  If in doubt, say M.
 
+config IP_DCCP_TFRC_LIB
+	depends on IP_DCCP_CCID3
+	def_tristate IP_DCCP_CCID3
+
 endmenu

net/dccp/ccids/Makefile

 obj-$(CONFIG_IP_DCCP_CCID3) += dccp_ccid3.o
 
-dccp_ccid3-y := ccid3.o lib/loss_interval.o lib/packet_history.o
+dccp_ccid3-y := ccid3.o
+
+obj-y += lib/

net/dccp/ccids/lib/Makefile

+obj-$(CONFIG_IP_DCCP_TFRC_LIB) += dccp_tfrc_lib.o
+
+dccp_tfrc_lib-y := loss_interval.o packet_history.o

net/dccp/ccids/lib/packet_history.c

@@ -35,6 +35,7 @@
  */
 
 #include <linux/config.h>
+#include <linux/module.h>
 #include <linux/string.h>
 
 #include "packet_history.h"
@@ -197,3 +198,8 @@ void dccp_tx_hist_purge(struct dccp_tx_hist *hist, struct list_head *list)
 }
 
 EXPORT_SYMBOL_GPL(dccp_tx_hist_purge);
+
+MODULE_AUTHOR("Ian McDonald <iam4@cs.waikato.ac.nz>, "
+	      "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
+MODULE_DESCRIPTION("DCCP TFRC library");
+MODULE_LICENSE("GPL");