can: extend sockaddr_can to include j1939 members

This patch prepares struct sockaddr_can for SAE J1939.

Signed-off-by: Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

include/uapi/linux/can.h

@@ -175,6 +175,23 @@ struct sockaddr_can {
 		/* transport protocol class address information (e.g. ISOTP) */
 		struct { canid_t rx_id, tx_id; } tp;
 
+		/* J1939 address information */
+		struct {
+			/* 8 byte name when using dynamic addressing */
+			__u64 name;
+
+			/* pgn:
+			 * 8 bit: PS in PDU2 case, else 0
+			 * 8 bit: PF
+			 * 1 bit: DP
+			 * 1 bit: reserved
+			 */
+			__u32 pgn;
+
+			/* 1 byte address */
+			__u8 addr;
+		} j1939;
+
 		/* reserved for future CAN protocols address information */
 	} can_addr;
 };