Phonet: 'connect' socket implementation for Pipe controller

Based on suggestion by Rémi Denis-Courmont to implement 'connect'
for Pipe controller logic,  this patch implements 'connect' socket
call for the Pipe controller logic.
The patch does following:-
- Removes setsockopts for PNPIPE_CREATE and PNPIPE_DESTROY
- Adds setsockopt for setting the Pipe handle value
- Implements connect socket call
- Updates the Pipe controller logic

User-space should now follow below sequence with Pipe controller:-
-socket
-bind
-setsockopt for PNPIPE_PIPE_HANDLE
-connect
-setsockopt for PNPIPE_ENCAP_IP
-setsockopt for PNPIPE_ENABLE

GPRS/3G data has been tested working fine with this.

Signed-off-by: Kumar Sanghvi <kumar.sanghvi@stericsson.com>
Acked-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/phonet.h

@@ -36,10 +36,9 @@
 /* Socket options for SOL_PNPIPE level */
 #define PNPIPE_ENCAP		1
 #define PNPIPE_IFINDEX		2
-#define PNPIPE_CREATE           3
+#define PNPIPE_PIPE_HANDLE	3
 #define PNPIPE_ENABLE           4
 /* unused slot */
-#define PNPIPE_DESTROY          6
 
 #define PNADDR_ANY		0
 #define PNADDR_BROADCAST	0xFC

include/net/phonet/pep.h

@@ -46,8 +46,8 @@ struct pep_sock {
 	u8			init_enable;	/* auto-enable at creation */
 	u8			aligned;
 #ifdef CONFIG_PHONET_PIPECTRLR
-	u16                     remote_pep;
-	u8                      pipe_state;
+	u8			pipe_state;
+	struct sockaddr_pn	remote_pep;
 #endif
 };