ft: netdev: add return value to tx_associate

Prior to this, an error sending the FT Reassociation was treated
as fatal, which is correct for FT-over-Air but not for FT-over-DS.
If the actual l_genl_family_send call fails for FT-over-DS the
existing connection can be maintained and there is no need to
call netdev_connect_failed.

Adding a return to the tx_associate function works for both FT
types. In the FT-over-Air case this return will ultimately get
sent back up to auth_proto_rx_authenticate in which case will
call netdev_connect_failed. For FT-over-DS tx_associate is
actually called from the 'start' operation which can fail and
still maintain the existing connection.

src/ft.c

@@ -287,9 +287,7 @@ static int ft_tx_reassociate(struct ft_sm *ft)
 		iov_elems += 1;
 	}
 
-	ft->tx_assoc(iov, iov_elems, ft->user_data);
-
-	return 0;
+	return ft->tx_assoc(iov, iov_elems, ft->user_data);
 
 error:
 	return -EINVAL;

src/ft.h

@@ -24,7 +24,7 @@ struct handshake_state;
 
 typedef void (*ft_tx_authenticate_func_t)(struct iovec *iov, size_t iov_len,
 					void *user_data);
-typedef void (*ft_tx_associate_func_t)(struct iovec *ie_iov, size_t iov_len,
+typedef int (*ft_tx_associate_func_t)(struct iovec *ie_iov, size_t iov_len,
 					void *user_data);
 
 typedef void (*ft_ds_free_func_t)(void *user_data);

src/netdev.c

@@ -3651,7 +3651,7 @@ restore_snonce:
 					MMPDU_STATUS_CODE_UNSPECIFIED);
 }
 
-static void netdev_ft_tx_associate(struct iovec *ie_iov, size_t iov_len,
+static int netdev_ft_tx_associate(struct iovec *ie_iov, size_t iov_len,
 					void *user_data)
 {
 	struct netdev *netdev = user_data;
@@ -3669,9 +3669,7 @@ static void netdev_ft_tx_associate(struct iovec *ie_iov, size_t iov_len,
 	if (!netdev->connect_cmd_id) {
 		l_genl_msg_unref(msg);
 
-		netdev_connect_failed(netdev, NETDEV_RESULT_ASSOCIATION_FAILED,
-					MMPDU_STATUS_CODE_UNSPECIFIED);
-		return;
+		return -EIO;
 	}
 
 	/* No need to keep this around at this point */
@@ -3679,6 +3677,8 @@ static void netdev_ft_tx_associate(struct iovec *ie_iov, size_t iov_len,
 		ft_ds_info_free(&netdev->ft_ds_info->super);
 		netdev->ft_ds_info = NULL;
 	}
+
+	return 0;
 }
 
 static void prepare_ft(struct netdev *netdev, struct scan_bss *target_bss)