net: context: Set local address properly for AF_CAN connections

At the moment there is no real address for local CANBUS socket,
but we can still set protocol family of local socket to AF_CAN
so that for example net-shell "net conn" command can show
information about it.

Signed-off-by: Jukka Rissanen <[email protected]>

Author: jukkar

subsys/net/ip/connection.c

@@ -306,6 +306,10 @@ int net_conn_register(u16_t proto, u8_t family,
 			if (net_sin(local_addr)->sin_addr.s_addr) {
 				flags |= NET_CONN_LOCAL_ADDR_SPEC;
 			}
+		} else if (IS_ENABLED(CONFIG_NET_SOCKETS_CAN) &&
+			   local_addr->sa_family == AF_CAN) {
+			memcpy(&conn->local_addr, local_addr,
+			       sizeof(struct sockaddr_can));
 		} else {
 			NET_ERR("Local address family not set");
 			goto error;

subsys/net/ip/net_context.c

@@ -1645,6 +1645,7 @@ static enum net_verdict net_context_raw_packet_received(
 static int recv_raw(struct net_context *context,
 		    net_context_recv_cb_t cb,
 		    s32_t timeout,
+		    struct sockaddr *local_addr,
 		    void *user_data)
 {
 	int ret;
@@ -1665,7 +1666,7 @@ static int recv_raw(struct net_context *context,
 
 	ret = net_conn_register(net_context_get_ip_proto(context),
 				net_context_get_family(context),
-				NULL, NULL, 0, 0,
+				NULL, local_addr, 0, 0,
 				net_context_raw_packet_received,
 				user_data,
 				&context->conn_handler);
@@ -1704,10 +1705,16 @@ int net_context_recv(struct net_context *context,
 	} else {
 		if (IS_ENABLED(CONFIG_NET_SOCKETS_PACKET) &&
 		    net_context_get_family(context) == AF_PACKET) {
-			ret = recv_raw(context, cb, timeout, user_data);
+			ret = recv_raw(context, cb, timeout, NULL, user_data);
 		} else if (IS_ENABLED(CONFIG_NET_SOCKETS_CAN) &&
 			   net_context_get_family(context) == AF_CAN) {
-			ret = recv_raw(context, cb, timeout, user_data);
+			struct sockaddr_can local_addr = {
+				.can_family = AF_CAN,
+			};
+
+			ret = recv_raw(context, cb, timeout,
+				       (struct sockaddr *)&local_addr,
+				       user_data);
 			if (ret == -EALREADY) {
 				/* This is perfectly normal for CAN sockets.
 				 * The SocketCAN will dispatch the packet to