[PATCH v4 1/8] doc: Document station Affinities property

[PATCH v4 1/8] doc: Document station Affinities property

[James Prestwood]

This documents new DBus property that expose a bit more control to
how IWD roams.

Setting the affinity on the connected BSS effectively "locks" IWD to
that BSS (except at critical RSSI levels, explained below). This can
be useful for clients that have access to more information about the
environment than IWD. For example, if a client is stationary there
is likely no point in trying to roam until it has moved elsewhere.

A new main.conf option would also be added:

[General].CriticalRoamThreshold

This would be the new roam threshold set if the currently connected
BSS is in the Affinities list. If the RSSI continues to drop below
this level IWD will still attempt to roam.
---
 doc/station-api.txt | 17 +++++++++++++++++
 src/iwd.config.rst  | 16 ++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/doc/station-api.txt b/doc/station-api.txt
index 84f1b7bf..707c6834 100644
--- a/doc/station-api.txt
+++ b/doc/station-api.txt
@@ -170,6 +170,23 @@ Properties	string State [readonly]
 			BSS the device is currently connected to or to which
 			a connection is in progress.
 
+		ao Affinities [optional] [experimental]
+
+			Array of net.connman.iwd.BasicServiceSet object paths
+			that will be treated with higher affinity compared to
+			other BSS's. Currently the only allowed value to be
+			set in this array is the path to the currently connected
+			BasicServiceSet object, i.e.
+			Station.ConnectedAccessPoint.
+
+			Setting the affinity will lower the roaming threshold,
+			effectively locking IWD to the current BSS unless the
+			RSSI drops below the critical threshold set by
+			[General].CriticalRoamThreshold{5G} at which point
+			IWD will proceed with normal roaming behavior.
+
+			This property is cleared on roams/disconnections.
+
 SignalLevelAgent hierarchy
 ==========================
 
diff --git a/src/iwd.config.rst b/src/iwd.config.rst
index d9c94e01..2d1f6dcd 100644
--- a/src/iwd.config.rst
+++ b/src/iwd.config.rst
@@ -130,6 +130,22 @@ The group ``[General]`` contains general settings.
        This value can be used to control how aggressively **iwd** roams when
        connected to a 5GHz access point.
 
+   * - CriticalRoamThreshold
+     - Value: rssi dBm value, from -100 to 1, default: **-80**
+
+       The threshold (for 2.4GHz) at which IWD will roam regardless of the
+       affinity set to the current BSS. If the connected BSS has affinity
+       (set in Station's Affinities list) the roam threshold will be lowed to
+       this value and IWD will not attempt to roam (or roam scan) until either
+       the affinity is cleared, or the signal drops below this threshold.
+
+
+   * - CriticalRoamThreshold5G
+     - Value: rssi dBm value, from -100 to 1, default: **-82**
+
+       This has the same effect as ``CriticalRoamThreshold``, but for the 5GHz
+       band.
+
    * - RoamRetryInterval
      - Value: unsigned int value in seconds (default: **60**)
 
-- 
2.34.1

[PATCH v4 2/8] netdev: define netdev settings in netdev.h

[James Prestwood]

Following knownnetworks, this moves the settings into a header file
which is easier to maintain/read.
---
 src/netdev.c | 8 ++++----
 src/netdev.h | 5 +++++
 2 files changed, 9 insertions(+), 4 deletions(-)

v4:
 * Fix typos

diff --git a/src/netdev.c b/src/netdev.c
index 494e46a5..e0121095 100644
--- a/src/netdev.c
+++ b/src/netdev.c
@@ -6264,16 +6264,16 @@ static int netdev_init(void)
 		goto fail_netlink;
 	}
 
-	if (!l_settings_get_int(settings, "General", "RoamThreshold",
+	if (!l_settings_get_int(settings, NETDEV_ROAM_THRESHOLD,
 					&LOW_SIGNAL_THRESHOLD))
 		LOW_SIGNAL_THRESHOLD = -70;
 
-	if (!l_settings_get_int(settings, "General", "RoamThreshold5G",
+	if (!l_settings_get_int(settings, NETDEV_ROAM_THRESHOLD_5G,
 					&LOW_SIGNAL_THRESHOLD_5GHZ))
 		LOW_SIGNAL_THRESHOLD_5GHZ = -76;
 
-	rand_addr_str = l_settings_get_value(settings, "General",
-						"AddressRandomization");
+	rand_addr_str = l_settings_get_value(settings,
+						NETDEV_ADDRESS_RANDOMIZATION);
 	if (rand_addr_str && !strcmp(rand_addr_str, "network"))
 		mac_per_ssid = true;
 
diff --git a/src/netdev.h b/src/netdev.h
index db0440d0..c48b2c38 100644
--- a/src/netdev.h
+++ b/src/netdev.h
@@ -29,6 +29,11 @@ struct eapol_sm;
 struct mmpdu_header;
 struct diagnostic_station_info;
 
+#define GENERAL "General"
+#define NETDEV_ADDRESS_RANDOMIZATION GENERAL, "AddressRandomization"
+#define NETDEV_ROAM_THRESHOLD GENERAL, "RoamThreshold"
+#define NETDEV_ROAM_THRESHOLD_5G GENERAL, "RoamThreshold5G"
+
 enum netdev_result {
 	NETDEV_RESULT_OK,
 	NETDEV_RESULT_AUTHENTICATION_FAILED,
-- 
2.34.1

Re: [PATCH v4 2/8] netdev: define netdev settings in netdev.h

[Denis Kenzior]

Hi James,

On 8/23/24 5:23 PM, James Prestwood wrote:
> Following knownnetworks, this moves the settings into a header file
> which is easier to maintain/read.
> ---
>   src/netdev.c | 8 ++++----
>   src/netdev.h | 5 +++++
>   2 files changed, 9 insertions(+), 4 deletions(-)
> 
> v4:
>   * Fix typos
> 

Patches 2-4 applied, thanks.

Regards,
-Denis

[PATCH v4 3/8] netdev: store signal threshold in netdev object, not globally

[James Prestwood]

This prepares for the ability to toggle between two signal
thresholds in netdev. Since each netdev may not need/want the
same threshold store it in the netdev object rather than globally.
---
 src/netdev.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/src/netdev.c b/src/netdev.c
index e0121095..1f1b9400 100644
--- a/src/netdev.c
+++ b/src/netdev.c
@@ -172,6 +172,9 @@ struct netdev {
 
 	struct netdev_ext_key_info *ext_key_info;
 
+	int low_signal_threshold;
+	int low_signal_threshold_5ghz;
+
 	bool connected : 1;
 	bool associated : 1;
 	bool operational : 1;
@@ -206,6 +209,9 @@ static struct l_genl_family *nl80211;
 static struct l_queue *netdev_list;
 static struct watchlist netdev_watches;
 static bool mac_per_ssid;
+/* Threshold RSSI for roaming to trigger, configurable in main.conf */
+static int LOW_SIGNAL_THRESHOLD;
+static int LOW_SIGNAL_THRESHOLD_5GHZ;
 
 static unsigned int iov_ie_append(struct iovec *iov,
 					unsigned int n_iov, unsigned int c,
@@ -1058,10 +1064,6 @@ struct netdev *netdev_find(int ifindex)
 	return l_queue_find(netdev_list, netdev_match, L_UINT_TO_PTR(ifindex));
 }
 
-/* Threshold RSSI for roaming to trigger, configurable in main.conf */
-static int LOW_SIGNAL_THRESHOLD;
-static int LOW_SIGNAL_THRESHOLD_5GHZ;
-
 static void netdev_cqm_event_rssi_threshold(struct netdev *netdev,
 						uint32_t rssi_event)
 {
@@ -1089,8 +1091,9 @@ static void netdev_cqm_event_rssi_value(struct netdev *netdev, int rssi_val)
 {
 	bool new_rssi_low;
 	uint8_t prev_rssi_level_idx = netdev->cur_rssi_level_idx;
-	int threshold = netdev->frequency > 4000 ? LOW_SIGNAL_THRESHOLD_5GHZ :
-						LOW_SIGNAL_THRESHOLD;
+	int threshold = netdev->frequency > 4000 ?
+					netdev->low_signal_threshold_5ghz :
+					netdev->low_signal_threshold;
 
 	if (!netdev->connected)
 		return;
@@ -3585,8 +3588,9 @@ static struct l_genl_msg *netdev_build_cmd_cqm_rssi_update(
 	uint32_t hyst = 5;
 	int thold_count;
 	int32_t thold_list[levels_num + 2];
-	int threshold = netdev->frequency > 4000 ? LOW_SIGNAL_THRESHOLD_5GHZ :
-						LOW_SIGNAL_THRESHOLD;
+	int threshold = netdev->frequency > 4000 ?
+					netdev->low_signal_threshold_5ghz :
+					netdev->low_signal_threshold;
 
 	if (levels_num == 0) {
 		thold_list[0] = threshold;
@@ -6163,6 +6167,8 @@ struct netdev *netdev_create_from_genl(struct l_genl_msg *msg,
 	l_strlcpy(netdev->name, ifname, IFNAMSIZ);
 	netdev->wiphy = wiphy;
 	netdev->pae_over_nl80211 = pae_io == NULL;
+	netdev->low_signal_threshold = LOW_SIGNAL_THRESHOLD;
+	netdev->low_signal_threshold_5ghz = LOW_SIGNAL_THRESHOLD_5GHZ;
 
 	if (set_mac)
 		memcpy(netdev->set_mac_once, set_mac, 6);
-- 
2.34.1

[PATCH v4 4/8] netdev: add critical signal threshold level

[James Prestwood]

This adds a secondary set of signal thresholds. The purpose of these
are to provide more flexibility in how IWD roams. The critical
threshold is intended to be temporary and is automatically reset
upon any connection changes: disconnects, roams, or new connections.
---
 src/netdev.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 src/netdev.h |  4 ++++
 2 files changed, 55 insertions(+)

diff --git a/src/netdev.c b/src/netdev.c
index 1f1b9400..73fbf0c1 100644
--- a/src/netdev.c
+++ b/src/netdev.c
@@ -212,6 +212,8 @@ static bool mac_per_ssid;
 /* Threshold RSSI for roaming to trigger, configurable in main.conf */
 static int LOW_SIGNAL_THRESHOLD;
 static int LOW_SIGNAL_THRESHOLD_5GHZ;
+static int CRITICAL_SIGNAL_THRESHOLD;
+static int CRITICAL_SIGNAL_THRESHOLD_5GHZ;
 
 static unsigned int iov_ie_append(struct iovec *iov,
 					unsigned int n_iov, unsigned int c,
@@ -841,6 +843,10 @@ static void netdev_connect_free(struct netdev *netdev)
 		l_genl_family_cancel(nl80211, netdev->get_oci_cmd_id);
 		netdev->get_oci_cmd_id = 0;
 	}
+
+	/* Reset thresholds back to default */
+	netdev->low_signal_threshold = LOW_SIGNAL_THRESHOLD;
+	netdev->low_signal_threshold_5ghz = LOW_SIGNAL_THRESHOLD_5GHZ;
 }
 
 static void netdev_connect_failed(struct netdev *netdev,
@@ -3674,6 +3680,39 @@ static int netdev_cqm_rssi_update(struct netdev *netdev)
 	return 0;
 }
 
+static int netdev_set_signal_thresholds(struct netdev *netdev, int threshold,
+					int threshold_5ghz)
+{
+	int current = netdev->frequency > 4000 ?
+					netdev->low_signal_threshold_5ghz :
+					netdev->low_signal_threshold;
+	int new = netdev->frequency > 4000 ? threshold_5ghz : threshold;
+
+	if (current == new)
+		return -EALREADY;
+
+	l_debug("changing low signal threshold to %d", new);
+
+	netdev->low_signal_threshold = threshold;
+	netdev->low_signal_threshold_5ghz = threshold_5ghz;
+
+	netdev_cqm_rssi_update(netdev);
+
+	return 0;
+}
+
+int netdev_lower_signal_threshold(struct netdev *netdev)
+{
+	return netdev_set_signal_thresholds(netdev, CRITICAL_SIGNAL_THRESHOLD,
+						CRITICAL_SIGNAL_THRESHOLD_5GHZ);
+}
+
+int netdev_raise_signal_threshold(struct netdev *netdev)
+{
+	return netdev_set_signal_thresholds(netdev, LOW_SIGNAL_THRESHOLD,
+						LOW_SIGNAL_THRESHOLD_5GHZ);
+}
+
 static bool netdev_connection_work_ready(struct wiphy_radio_work_item *item)
 {
 	struct netdev *netdev = l_container_of(item, struct netdev, work);
@@ -3887,6 +3926,8 @@ done:
 	netdev->handshake = hs;
 	netdev->sm = sm;
 	netdev->cur_rssi = bss->signal_strength / 100;
+	netdev->low_signal_threshold = LOW_SIGNAL_THRESHOLD;
+	netdev->low_signal_threshold_5ghz = LOW_SIGNAL_THRESHOLD_5GHZ;
 
 	if (netdev->rssi_levels_num)
 		netdev_set_rssi_level_idx(netdev);
@@ -4260,6 +4301,8 @@ int netdev_ft_reassociate(struct netdev *netdev,
 	netdev->event_filter = event_filter;
 	netdev->connect_cb = cb;
 	netdev->user_data = user_data;
+	netdev->low_signal_threshold = LOW_SIGNAL_THRESHOLD;
+	netdev->low_signal_threshold_5ghz = LOW_SIGNAL_THRESHOLD_5GHZ;
 
 	/*
 	 * Cancel commands that could be running because of EAPoL activity
@@ -6278,6 +6321,14 @@ static int netdev_init(void)
 					&LOW_SIGNAL_THRESHOLD_5GHZ))
 		LOW_SIGNAL_THRESHOLD_5GHZ = -76;
 
+	if (!l_settings_get_int(settings, NETDEV_CRITICAL_ROAM_THRESHOLD,
+					&CRITICAL_SIGNAL_THRESHOLD))
+		CRITICAL_SIGNAL_THRESHOLD = -80;
+
+	if (!l_settings_get_int(settings, NETDEV_CRITICAL_ROAM_THRESHOLD_5G,
+					&CRITICAL_SIGNAL_THRESHOLD_5GHZ))
+		CRITICAL_SIGNAL_THRESHOLD_5GHZ = -82;
+
 	rand_addr_str = l_settings_get_value(settings,
 						NETDEV_ADDRESS_RANDOMIZATION);
 	if (rand_addr_str && !strcmp(rand_addr_str, "network"))
diff --git a/src/netdev.h b/src/netdev.h
index c48b2c38..6299934e 100644
--- a/src/netdev.h
+++ b/src/netdev.h
@@ -33,6 +33,8 @@ struct diagnostic_station_info;
 #define NETDEV_ADDRESS_RANDOMIZATION GENERAL, "AddressRandomization"
 #define NETDEV_ROAM_THRESHOLD GENERAL, "RoamThreshold"
 #define NETDEV_ROAM_THRESHOLD_5G GENERAL, "RoamThreshold5G"
+#define NETDEV_CRITICAL_ROAM_THRESHOLD GENERAL, "CriticalRoamThreshold"
+#define NETDEV_CRITICAL_ROAM_THRESHOLD_5G GENERAL, "CriticalRoamThreshold5G"
 
 enum netdev_result {
 	NETDEV_RESULT_OK,
@@ -202,6 +204,8 @@ int netdev_neighbor_report_req(struct netdev *netdev,
 
 int netdev_set_rssi_report_levels(struct netdev *netdev, const int8_t *levels,
 					size_t levels_num);
+int netdev_lower_signal_threshold(struct netdev *netdev);
+int netdev_raise_signal_threshold(struct netdev *netdev);
 
 int netdev_get_station(struct netdev *netdev, const uint8_t *mac,
 			netdev_get_station_cb_t cb, void *user_data,
-- 
2.34.1

[PATCH v4 5/8] station: add Affinities DBus property

[James Prestwood]

This property will hold an array of object paths for
BasicServiceSet (BSS) objects. For the purpose of this patch
only the setter/getter and client watch is implemented. The
purpose of this array is to guide or loosly lock IWD to certain
BSS's provided that some external client has more information
about the environment than what IWD takes into account for its
roaming decisions.

For the time being, the array is limited to only the connected
BSS path, and any roams or disconnects will clear the array.

The intended use case for this is if the device is stationary
an external client could reduce the likelihood of roaming by
setting the affinity to the current BSS.
---
 src/station.c | 145 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 145 insertions(+)

diff --git a/src/station.c b/src/station.c
index 30a1232a..c72d42ae 100644
--- a/src/station.c
+++ b/src/station.c
@@ -128,6 +128,10 @@ struct station {
 
 	uint64_t last_roam_scan;
 
+	struct l_queue *affinities;
+	unsigned int affinity_watch;
+	char *affinity_client;
+
 	bool preparing_roam : 1;
 	bool roam_scan_full : 1;
 	bool signal_low : 1;
@@ -449,6 +453,14 @@ static const char *station_get_bss_path(struct station *station,
 	return __network_path_append_bss(network_path, bss);
 }
 
+static bool match_bss_path(const void *data, const void *user_data)
+{
+	const char *path1 = data;
+	const char *path2 = user_data;
+
+	return !strcmp(path1, path2);
+}
+
 static bool station_unregister_bss(struct station *station,
 					struct scan_bss *bss)
 {
@@ -457,6 +469,8 @@ static bool station_unregister_bss(struct station *station,
 	if (L_WARN_ON(!path))
 		return false;
 
+	l_queue_remove_if(station->affinities, match_bss_path, path);
+
 	return l_dbus_unregister_object(dbus_get_bus(), path);
 }
 
@@ -1740,6 +1754,13 @@ static void station_enter_state(struct station *station,
 		station_set_evict_nocarrier(station, true);
 		station_set_drop_neighbor_discovery(station, false);
 		station_set_drop_unicast_l2_multicast(station, false);
+
+		if (station->affinity_watch) {
+			l_dbus_remove_watch(dbus_get_bus(),
+						station->affinity_watch);
+			station->affinity_watch = 0;
+		}
+
 		break;
 	case STATION_STATE_DISCONNECTING:
 	case STATION_STATE_NETCONFIG:
@@ -1747,6 +1768,12 @@ static void station_enter_state(struct station *station,
 	case STATION_STATE_ROAMING:
 	case STATION_STATE_FT_ROAMING:
 	case STATION_STATE_FW_ROAMING:
+		if (station->affinity_watch) {
+			l_dbus_remove_watch(dbus_get_bus(),
+						station->affinity_watch);
+			station->affinity_watch = 0;
+		}
+
 		station_set_evict_nocarrier(station, false);
 		break;
 	}
@@ -4520,6 +4547,118 @@ static bool station_property_get_state(struct l_dbus *dbus,
 	return true;
 }
 
+static bool station_property_get_affinities(struct l_dbus *dbus,
+					struct l_dbus_message *message,
+					struct l_dbus_message_builder *builder,
+					void *user_data)
+{
+	struct station *station = user_data;
+	const struct l_queue_entry *e;
+
+	if (!station->connected_network)
+		return false;
+
+	l_dbus_message_builder_enter_array(builder, "o");
+
+	for (e = l_queue_get_entries(station->affinities); e; e = e->next) {
+		const char *path = e->data;
+
+		l_dbus_message_builder_append_basic(builder, 'o', path);
+	}
+
+	l_dbus_message_builder_leave_array(builder);
+
+	return true;
+}
+
+static void station_affinity_disconnected_cb(struct l_dbus *dbus,
+						void *user_data)
+{
+	struct station *station = user_data;
+
+	l_dbus_remove_watch(dbus_get_bus(), station->affinity_watch);
+	station->affinity_watch = 0;
+
+	l_debug("client that set affinity has disconnected");
+}
+
+static void station_affinity_watch_destroy(void *user_data)
+{
+	struct station *station = user_data;
+
+	l_free(station->affinity_client);
+	station->affinity_client = NULL;
+
+	l_queue_destroy(station->affinities, l_free);
+	station->affinities = NULL;
+
+	l_dbus_property_changed(dbus_get_bus(),
+				netdev_get_path(station->netdev),
+				IWD_STATION_INTERFACE, "Affinities");
+}
+
+static struct l_dbus_message *station_property_set_affinities(
+					struct l_dbus *dbus,
+					struct l_dbus_message *message,
+					struct l_dbus_message_iter *new_value,
+					l_dbus_property_complete_cb_t complete,
+					void *user_data)
+{
+	struct station *station = user_data;
+	struct l_dbus_message_iter array;
+	const char *sender = l_dbus_message_get_sender(message);
+	const char *path;
+	struct l_queue *new_affinities;
+
+	if (!station->connected_network)
+		return dbus_error_not_connected(message);
+
+	if (!station->affinity_watch) {
+		station->affinity_client = l_strdup(sender);
+		station->affinity_watch = l_dbus_add_disconnect_watch(dbus,
+					sender,
+					station_affinity_disconnected_cb,
+					station,
+					station_affinity_watch_destroy);
+	} else if (strcmp(station->affinity_client, sender)) {
+		l_warn("Only one client may manage Affinities property");
+		return dbus_error_not_available(message);
+	}
+
+	if (!l_dbus_message_iter_get_variant(new_value, "ao", &array))
+		return dbus_error_invalid_args(message);
+
+	new_affinities = l_queue_new();
+
+	while (l_dbus_message_iter_next_entry(&array, &path)) {
+		struct scan_bss *bss = l_dbus_object_get_data(dbus_get_bus(),
+						path,
+						IWD_BSS_INTERFACE);
+
+		/*
+		 * TODO: For now only allow the affinities array to contain the
+		 *       connected BSS path. Any other values will be rejected.
+		 *       This could change in the future.
+		 */
+		if (bss != station->connected_bss) {
+			l_queue_destroy(new_affinities, l_free);
+			return dbus_error_invalid_args(message);
+		}
+
+		l_queue_push_head(new_affinities, l_strdup(path));
+	}
+
+	l_queue_destroy(station->affinities, l_free);
+	station->affinities = new_affinities;
+
+	l_dbus_property_changed(dbus, netdev_get_path(station->netdev),
+				IWD_STATION_INTERFACE, "Affinities");
+
+	complete(dbus, message, NULL);
+
+	return NULL;
+}
+
 void station_foreach(station_foreach_func_t func, void *user_data)
 {
 	const struct l_queue_entry *entry;
@@ -4842,6 +4981,9 @@ static void station_free(struct station *station)
 
 	l_queue_destroy(station->roam_bss_list, l_free);
 
+	if (station->affinity_watch)
+		l_dbus_remove_watch(dbus_get_bus(), station->affinity_watch);
+
 	l_free(station);
 }
 
@@ -4878,6 +5020,9 @@ static void station_setup_interface(struct l_dbus_interface *interface)
 					station_property_get_scanning, NULL);
 	l_dbus_interface_property(interface, "State", 0, "s",
 					station_property_get_state, NULL);
+	l_dbus_interface_property(interface, "Affinities", 0, "ao",
+					station_property_get_affinities,
+					station_property_set_affinities);
 }
 
 static void station_destroy_interface(void *user_data)
-- 
2.34.1

Re: [PATCH v4 5/8] station: add Affinities DBus property

[Denis Kenzior]

Hi James,

On 8/23/24 5:23 PM, James Prestwood wrote:
> This property will hold an array of object paths for
> BasicServiceSet (BSS) objects. For the purpose of this patch
> only the setter/getter and client watch is implemented. The
> purpose of this array is to guide or loosly lock IWD to certain

typo: 'loosely'

> BSS's provided that some external client has more information
> about the environment than what IWD takes into account for its
> roaming decisions.
> 
> For the time being, the array is limited to only the connected
> BSS path, and any roams or disconnects will clear the array.
> 
> The intended use case for this is if the device is stationary
> an external client could reduce the likelihood of roaming by
> setting the affinity to the current BSS.
> ---
>   src/station.c | 145 ++++++++++++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 145 insertions(+)
> 
> diff --git a/src/station.c b/src/station.c
> index 30a1232a..c72d42ae 100644
> --- a/src/station.c
> +++ b/src/station.c
> @@ -128,6 +128,10 @@ struct station {
>   
>   	uint64_t last_roam_scan;
>   
> +	struct l_queue *affinities;
> +	unsigned int affinity_watch;
> +	char *affinity_client;
> +
>   	bool preparing_roam : 1;
>   	bool roam_scan_full : 1;
>   	bool signal_low : 1;
> @@ -449,6 +453,14 @@ static const char *station_get_bss_path(struct station *station,
>   	return __network_path_append_bss(network_path, bss);
>   }
>   
> +static bool match_bss_path(const void *data, const void *user_data)
> +{
> +	const char *path1 = data;
> +	const char *path2 = user_data;
> +
> +	return !strcmp(path1, path2);
> +}
> +
>   static bool station_unregister_bss(struct station *station,
>   					struct scan_bss *bss)
>   {
> @@ -457,6 +469,8 @@ static bool station_unregister_bss(struct station *station,
>   	if (L_WARN_ON(!path))
>   		return false;
>   
> +	l_queue_remove_if(station->affinities, match_bss_path, path);
> +
>   	return l_dbus_unregister_object(dbus_get_bus(), path);
>   }
>   
> @@ -1740,6 +1754,13 @@ static void station_enter_state(struct station *station,
>   		station_set_evict_nocarrier(station, true);
>   		station_set_drop_neighbor_discovery(station, false);
>   		station_set_drop_unicast_l2_multicast(station, false);
> +
> +		if (station->affinity_watch) {
> +			l_dbus_remove_watch(dbus_get_bus(),
> +						station->affinity_watch);
> +			station->affinity_watch = 0;
> +		}
> +

Hmm, but not resetting affinities?

>   		break;
>   	case STATION_STATE_DISCONNECTING:
>   	case STATION_STATE_NETCONFIG:
> @@ -1747,6 +1768,12 @@ static void station_enter_state(struct station *station,
>   	case STATION_STATE_ROAMING:
>   	case STATION_STATE_FT_ROAMING:
>   	case STATION_STATE_FW_ROAMING:
> +		if (station->affinity_watch) {
> +			l_dbus_remove_watch(dbus_get_bus(),
> +						station->affinity_watch);
> +			station->affinity_watch = 0;

Okay.  This reminds me that for hardware supporting FW roaming we may want to 
return NotCapable when setting Affinities.

> +		}
> +
>   		station_set_evict_nocarrier(station, false);
>   		break;
>   	}

<snip>

> +static void station_affinity_watch_destroy(void *user_data)
> +{
> +	struct station *station = user_data;
> +
> +	l_free(station->affinity_client);
> +	station->affinity_client = NULL;
> +
> +	l_queue_destroy(station->affinities, l_free);
> +	station->affinities = NULL;
> +
> +	l_dbus_property_changed(dbus_get_bus(),
> +				netdev_get_path(station->netdev),
> +				IWD_STATION_INTERFACE, "Affinities");

What if the list was empty?

> +}
> +
> +static struct l_dbus_message *station_property_set_affinities(
> +					struct l_dbus *dbus,
> +					struct l_dbus_message *message,
> +					struct l_dbus_message_iter *new_value,
> +					l_dbus_property_complete_cb_t complete,
> +					void *user_data)
> +{
> +	struct station *station = user_data;
> +	struct l_dbus_message_iter array;
> +	const char *sender = l_dbus_message_get_sender(message);
> +	const char *path;
> +	struct l_queue *new_affinities;
> +
> +	if (!station->connected_network)
> +		return dbus_error_not_connected(message);
> +
> +	if (!station->affinity_watch) {
> +		station->affinity_client = l_strdup(sender);
> +		station->affinity_watch = l_dbus_add_disconnect_watch(dbus,
> +					sender,
> +					station_affinity_disconnected_cb,
> +					station,
> +					station_affinity_watch_destroy);
> +	} else if (strcmp(station->affinity_client, sender)) {
> +		l_warn("Only one client may manage Affinities property");
> +		return dbus_error_not_available(message);

Hmm, we probably need a new error for 'permission denied or something'

> +	}
> +
> +	if (!l_dbus_message_iter_get_variant(new_value, "ao", &array))
> +		return dbus_error_invalid_args(message);

So what happens to affinity_client / affinity_watch above?

> +
> +	new_affinities = l_queue_new();
> +
> +	while (l_dbus_message_iter_next_entry(&array, &path)) {
> +		struct scan_bss *bss = l_dbus_object_get_data(dbus_get_bus(),
> +						path,
> +						IWD_BSS_INTERFACE);
> +
> +		/*
> +		 * TODO: For now only allow the affinities array to contain the
> +		 *       connected BSS path. Any other values will be rejected.
> +		 *       This could change in the future.
> +		 */
> +		if (bss != station->connected_bss) {
> +			l_queue_destroy(new_affinities, l_free);
> +			return dbus_error_invalid_args(message);

same as above?

You may want to make your life easier by just looking for an empty list or list 
of size 1 with the connected bss.

> +		}
> +
> +		l_queue_push_head(new_affinities, l_strdup(path));
> +	}
> +
> +	l_queue_destroy(station->affinities, l_free);
> +	station->affinities = new_affinities;

If the list is empty, should you unregister the watch?

> +
> +	l_dbus_property_changed(dbus, netdev_get_path(station->netdev),
> +				IWD_STATION_INTERFACE, "Affinities");
> +
> +	complete(dbus, message, NULL);

It is the other way around, we send the 'message_return' first, then the signal. 
  Do you want to spuriously emit if the two lists are the same?

> +
> +	return NULL;
> +}
> +
>   void station_foreach(station_foreach_func_t func, void *user_data)
>   {
>   	const struct l_queue_entry *entry;

Regards,
-Denis

[PATCH v4 6/8] station: Use Affinities property to change roaming threshold

[James Prestwood]

When the affinity is set to the current BSS lower the roaming
threshold to loosly lock IWD to the current BSS. The lower
threshold is automatically removed upon roaming/disconnection
since the affinity array is also cleared out.
---
 src/station.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/station.c b/src/station.c
index c72d42ae..ca0b5329 100644
--- a/src/station.c
+++ b/src/station.c
@@ -4580,6 +4580,9 @@ static void station_affinity_disconnected_cb(struct l_dbus *dbus,
 	station->affinity_watch = 0;
 
 	l_debug("client that set affinity has disconnected");
+
+	/* The client who set the affinity disconnected, raise the threshold */
+	netdev_raise_signal_threshold(station->netdev);
 }
 
 static void station_affinity_watch_destroy(void *user_data)
@@ -4609,6 +4612,7 @@ static struct l_dbus_message *station_property_set_affinities(
 	const char *sender = l_dbus_message_get_sender(message);
 	const char *path;
 	struct l_queue *new_affinities;
+	bool lower_threshold = false;
 
 	if (!station->connected_network)
 		return dbus_error_not_connected(message);
@@ -4645,6 +4649,8 @@ static struct l_dbus_message *station_property_set_affinities(
 			return dbus_error_invalid_args(message);
 		}
 
+		lower_threshold = true;
+
 		l_queue_push_head(new_affinities, l_strdup(path));
 	}
 
@@ -4654,6 +4660,17 @@ static struct l_dbus_message *station_property_set_affinities(
 	l_dbus_property_changed(dbus, netdev_get_path(station->netdev),
 				IWD_STATION_INTERFACE, "Affinities");
 
+	/*
+	 * If affinity was set to the current BSS, lower the roam threshold. If
+	 * the connected BSS was not in the list raise the signal threshold.
+	 * The threshold may already be raised, in which case netdev will detect
+	 * this and do nothing.
+	 */
+	if (lower_threshold)
+		netdev_lower_signal_threshold(station->netdev);
+	else
+		netdev_raise_signal_threshold(station->netdev);
+
 	complete(dbus, message, NULL);
 
 	return NULL;
-- 
2.34.1

[PATCH v4 7/8] auto-t: add affinities property for station, and extended_service_set

[James Prestwood]

---
 autotests/util/iwd.py | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/autotests/util/iwd.py b/autotests/util/iwd.py
index 74bb25c0..83f2d9ef 100755
--- a/autotests/util/iwd.py
+++ b/autotests/util/iwd.py
@@ -596,6 +596,11 @@ class Device(IWDDBusAbstract):
         props = self._station_properties()
         return props.get('ConnectedNetwork')
 
+    @property
+    def connected_bss(self):
+        props = self._station_properties()
+        return props.get('ConnectedAccessPoint')
+
     @property
     def powered(self):
         '''
@@ -630,6 +635,19 @@ class Device(IWDDBusAbstract):
         self._station_debug._prop_proxy.Set(IWD_STATION_DEBUG_INTERFACE,
                                             'AutoConnect', value)
 
+    @property
+    def affinities(self):
+        return self._station_properties()['Affinities']
+
+    @affinities.setter
+    def affinities(self, values):
+        self._station_properties()
+        self._station_prop_if.Set(
+            IWD_STATION_INTERFACE, 'Affinities',
+            dbus.Array([dbus.ObjectPath(v) for v in values], signature="o"),
+            reply_handler=self._success, error_handler=self._failure)
+        self._wait_for_async_op()
+
     def scan(self, wait=True):
         '''Schedule a network scan.
 
-- 
2.34.1

[PATCH v4 8/8] auto-t: add tests for Affinities behavior

[James Prestwood]

---
 autotests/testAffinity/TestFT.psk           |   2 +
 autotests/testAffinity/ft-psk-ccmp-1.conf   |  41 ++++
 autotests/testAffinity/ft-psk-ccmp-2.conf   |  41 ++++
 autotests/testAffinity/hw.conf              |   8 +
 autotests/testAffinity/main.conf            |   5 +
 autotests/testAffinity/test_set_affinity.py | 216 ++++++++++++++++++++
 6 files changed, 313 insertions(+)
 create mode 100644 autotests/testAffinity/TestFT.psk
 create mode 100644 autotests/testAffinity/ft-psk-ccmp-1.conf
 create mode 100644 autotests/testAffinity/ft-psk-ccmp-2.conf
 create mode 100644 autotests/testAffinity/hw.conf
 create mode 100644 autotests/testAffinity/main.conf
 create mode 100644 autotests/testAffinity/test_set_affinity.py

diff --git a/autotests/testAffinity/TestFT.psk b/autotests/testAffinity/TestFT.psk
new file mode 100644
index 00000000..e82d1295
--- /dev/null
+++ b/autotests/testAffinity/TestFT.psk
@@ -0,0 +1,2 @@
+[Security]
+Passphrase=EasilyGuessedPassword
diff --git a/autotests/testAffinity/ft-psk-ccmp-1.conf b/autotests/testAffinity/ft-psk-ccmp-1.conf
new file mode 100644
index 00000000..839eb496
--- /dev/null
+++ b/autotests/testAffinity/ft-psk-ccmp-1.conf
@@ -0,0 +1,41 @@
+hw_mode=g
+channel=1
+ssid=TestFT
+utf8_ssid=1
+ctrl_interface=/var/run/hostapd
+
+r1_key_holder=120000000001
+nas_identifier=dummy1
+
+wpa=2
+# Can support WPA-PSK and FT-PSK (space separated list) and/or EAP at the same
+# time but we want to force FT
+wpa_key_mgmt=FT-PSK
+wpa_pairwise=CCMP
+wpa_passphrase=EasilyGuessedPassword
+ieee80211w=0
+rsn_preauth=1
+rsn_preauth_interfaces=lo
+disable_pmksa_caching=0
+# Allow PMK cache to be shared opportunistically among configured interfaces
+# and BSSes (i.e., all configurations within a single hostapd process).
+okc=1
+mobility_domain=1234
+reassociation_deadline=60000
+r0kh=12:00:00:00:00:01 dummy1 000102030405060708090a0b0c0d0e0f
+r0kh=12:00:00:00:00:02 dummy2 000102030405060708090a0b0c0d0e0f
+r1kh=12:00:00:00:00:01 00:00:00:00:00:01 000102030405060708090a0b0c0d0e0f
+r1kh=12:00:00:00:00:02 00:00:00:00:00:02 000102030405060708090a0b0c0d0e0f
+# Push mode only needed for 8021x, not PSK mode since msk already known
+pmk_r1_push=0
+# Allow locally generated FT response so we don't have to configure push/pull
+# between BSSes running as separate hostapd processes as in the test-runner
+# case.  Only works with FT-PSK, otherwise brctl needs to be installed and
+# CONFIG_BRIDGE enabled in the kernel.
+ft_psk_generate_local=1
+rkh_pull_timeout=50
+ft_over_ds=0
+ap_table_expiration_time=36000
+ap_table_max_size=10
+rrm_neighbor_report=1
+ocv=1
diff --git a/autotests/testAffinity/ft-psk-ccmp-2.conf b/autotests/testAffinity/ft-psk-ccmp-2.conf
new file mode 100644
index 00000000..2ffd7262
--- /dev/null
+++ b/autotests/testAffinity/ft-psk-ccmp-2.conf
@@ -0,0 +1,41 @@
+hw_mode=g
+channel=2
+ssid=TestFT
+utf8_ssid=1
+ctrl_interface=/var/run/hostapd
+
+r1_key_holder=120000000002
+nas_identifier=dummy2
+
+wpa=2
+# Can support WPA-PSK and FT-PSK (space separated list) and/or EAP at the same
+# time but we want to force FT
+wpa_key_mgmt=FT-PSK
+wpa_pairwise=CCMP
+wpa_passphrase=EasilyGuessedPassword
+ieee80211w=0
+rsn_preauth=1
+rsn_preauth_interfaces=lo
+disable_pmksa_caching=0
+# Allow PMK cache to be shared opportunistically among configured interfaces
+# and BSSes (i.e., all configurations within a single hostapd process).
+okc=1
+mobility_domain=1234
+reassociation_deadline=60000
+r0kh=12:00:00:00:00:01 dummy1 000102030405060708090a0b0c0d0e0f
+r0kh=12:00:00:00:00:02 dummy2 000102030405060708090a0b0c0d0e0f
+r1kh=12:00:00:00:00:01 00:00:00:00:00:01 000102030405060708090a0b0c0d0e0f
+r1kh=12:00:00:00:00:02 00:00:00:00:00:02 000102030405060708090a0b0c0d0e0f
+# Push mode only needed for 8021x, not PSK mode since msk already known
+pmk_r1_push=0
+# Allow locally generated FT response so we don't have to configure push/pull
+# between BSSes running as separate hostapd processes as in the test-runner
+# case.  Only works with FT-PSK, otherwise brctl needs to be installed and
+# CONFIG_BRIDGE enabled in the kernel.
+ft_psk_generate_local=1
+rkh_pull_timeout=50
+ft_over_ds=0
+ap_table_expiration_time=36000
+ap_table_max_size=10
+rrm_neighbor_report=1
+ocv=1
diff --git a/autotests/testAffinity/hw.conf b/autotests/testAffinity/hw.conf
new file mode 100644
index 00000000..c2b35d6e
--- /dev/null
+++ b/autotests/testAffinity/hw.conf
@@ -0,0 +1,8 @@
+[SETUP]
+num_radios=3
+start_iwd=0
+hwsim_medium=yes
+
+[HOSTAPD]
+rad0=ft-psk-ccmp-1.conf
+rad1=ft-psk-ccmp-2.conf
diff --git a/autotests/testAffinity/main.conf b/autotests/testAffinity/main.conf
new file mode 100644
index 00000000..3d93ff57
--- /dev/null
+++ b/autotests/testAffinity/main.conf
@@ -0,0 +1,5 @@
+[Scan]
+DisableMacAddressRandomization=true
+
+[General]
+RoamRetryInterval=1
diff --git a/autotests/testAffinity/test_set_affinity.py b/autotests/testAffinity/test_set_affinity.py
new file mode 100644
index 00000000..5754aee0
--- /dev/null
+++ b/autotests/testAffinity/test_set_affinity.py
@@ -0,0 +1,216 @@
+#! /usr/bin/python3
+
+import unittest
+import sys, os
+import dbus
+
+sys.path.append('../util')
+from config import ctx
+import iwd
+from iwd import IWD, IWDDBusAbstract
+from iwd import NetworkType
+from hwsim import Hwsim
+from hostapd import HostapdCLI
+
+#
+# Separate client used to test DBus disconnects so we don't bring down the
+# entire IWD python library
+#
+class AffinityClient(IWDDBusAbstract):
+    def __init__(self, device_path):
+        self._bus = dbus.bus.BusConnection(address_or_type=ctx.dbus_address)
+        self._station_prop_if = dbus.Interface(
+                        self._bus.get_object(iwd.IWD_SERVICE, device_path),
+                        iwd.DBUS_PROPERTIES)
+
+    def set(self, values):
+        self._station_prop_if.Set(iwd.IWD_STATION_INTERFACE, 'Affinities', dbus.Array([dbus.ObjectPath(v) for v in values], signature="o"))
+
+    def close(self):
+        self._bus.close()
+
+class Test(unittest.TestCase):
+    def connect(self, device, hapd):
+        ordered_network = device.get_ordered_network('TestFT', full_scan=True)
+
+        self.assertEqual(ordered_network.type, NetworkType.psk)
+
+        condition = 'not obj.connected'
+        self.wd.wait_for_object_condition(ordered_network.network_object, condition)
+
+        device.connect_bssid(hapd.bssid)
+
+        condition = 'obj.state == DeviceState.connected'
+        self.wd.wait_for_object_condition(device, condition)
+
+    def test_set_affinity(self):
+        device = self.wd.list_devices(1)[0]
+
+        self.connect(device, self.bss_hostapd[0])
+
+        print(device.connected_bss)
+
+        device.affinities = [device.connected_bss]
+
+        # IWD should not attempt to roam
+        with self.assertRaises(TimeoutError):
+            device.wait_for_event("roam-scan-triggered")
+
+        device.affinities = []
+        device.wait_for_event("roam-scan-triggered")
+
+    def test_roam_below_critical(self):
+        device = self.wd.list_devices(1)[0]
+
+        self.connect(device, self.bss_hostapd[0])
+
+        device.affinities = [device.connected_bss]
+
+        # IWD should not attempt to roam
+        with self.assertRaises(TimeoutError):
+            device.wait_for_event("roam-scan-triggered")
+
+        # Lower signal past critical level
+        self.bss0_rule.signal = -9000
+
+        device.wait_for_event("roam-scan-triggered")
+
+    def test_error_conditions(self):
+        device = self.wd.list_devices(1)[0]
+
+        # Calling set while disconnected should fail
+        with self.assertRaises(iwd.NotConnectedEx):
+            device.affinities = ["/some/path"]
+
+        self.connect(device, self.bss_hostapd[0])
+
+        device.affinities = [device.connected_bss]
+
+        # An invalid path should fail
+        with self.assertRaises(iwd.InvalidArgumentsEx):
+            device.affinities = [device.connected_bss, "/an/invalid/path"]
+
+    def test_affinity_client_disconnect(self):
+        device = self.wd.list_devices(1)[0]
+
+        client = AffinityClient(device.device_path)
+
+        self.connect(device, self.bss_hostapd[0])
+
+        client.set([device.connected_bss])
+
+        with self.assertRaises(TimeoutError):
+            device.wait_for_event("roam-scan-triggered")
+
+        client._bus.close()
+
+        device.wait_for_event("roam-scan-triggered")
+
+    def test_affinity_client_reconnect_during_roam(self):
+        device = self.wd.list_devices(1)[0]
+
+        client = AffinityClient(device.device_path)
+
+        self.connect(device, self.bss_hostapd[0])
+
+        client.set([device.connected_bss])
+
+        # Lower signal past critical level
+        self.bss0_rule.signal = -9000
+
+        device.wait_for_event("roam-scan-triggered")
+
+        client.close()
+        del client
+        client = AffinityClient(device.device_path)
+        # setting here should get cleared after connecting
+        client.set([device.connected_bss])
+
+        device.wait_for_event("ft-authenticating")
+        device.wait_for_event("associating")
+        device.wait_for_event("connected")
+
+        # Affinity should be reset, and IWD should be trying to roam
+        device.wait_for_event("roam-scan-triggered")
+
+    def test_cleanup_with_connected_client(self):
+        device = self.wd.list_devices(1)[0]
+
+        client = AffinityClient(device.device_path)
+
+        self.connect(device, self.bss_hostapd[0])
+
+        client.set([device.connected_bss])
+        self.wd.stop()
+
+    def test_affinity_removed_after_roam(self):
+        device = self.wd.list_devices(1)[0]
+
+        self.connect(device, self.bss_hostapd[0])
+
+        device.affinities = [device.connected_bss]
+
+        # Lower signal past critical level
+        self.bss0_rule.signal = -9000
+
+        device.wait_for_event("roam-scan-triggered")
+
+        device.wait_for_event("ft-authenticating")
+        device.wait_for_event("associating")
+        device.wait_for_event("connected")
+
+        self.assertEqual(device.affinities, [])
+
+    def tearDown(self):
+        os.system('ip link set "' + self.bss_hostapd[0].ifname + '" down')
+        os.system('ip link set "' + self.bss_hostapd[1].ifname + '" down')
+        os.system('ip link set "' + self.bss_hostapd[0].ifname + '" up')
+        os.system('ip link set "' + self.bss_hostapd[1].ifname + '" up')
+
+        self.wd.stop()
+        self.wd = None
+
+    def setUp(self):
+        self.bss0_rule.signal = -8000
+        self.bss1_rule.signal = -8000
+
+        self.wd = IWD(True)
+
+    @classmethod
+    def setUpClass(cls):
+        hwsim = Hwsim()
+
+        IWD.copy_to_storage('TestFT.psk')
+
+        cls.bss_hostapd = [ HostapdCLI(config='ft-psk-ccmp-1.conf'),
+                            HostapdCLI(config='ft-psk-ccmp-2.conf') ]
+
+        rad0 = hwsim.get_radio('rad0')
+        rad1 = hwsim.get_radio('rad1')
+
+        cls.bss0_rule = hwsim.rules.create()
+        cls.bss0_rule.source = rad0.addresses[0]
+        cls.bss0_rule.bidirectional = True
+        cls.bss0_rule.signal = -8000
+        cls.bss0_rule.enabled = True
+
+        cls.bss1_rule = hwsim.rules.create()
+        cls.bss1_rule.source = rad1.addresses[0]
+        cls.bss1_rule.bidirectional = True
+        cls.bss1_rule.signal = -8000
+        cls.bss1_rule.enabled = True
+
+        cls.bss_hostapd[0].set_address('12:00:00:00:00:01')
+        cls.bss_hostapd[1].set_address('12:00:00:00:00:02')
+
+        HostapdCLI.group_neighbors(*cls.bss_hostapd)
+
+    @classmethod
+    def tearDownClass(cls):
+        IWD.clear_storage()
+        cls.bss_hostapd = None
+        cls.bss0_rule.remove()
+        cls.bss1_rule.remove()
+
+if __name__ == '__main__':
+    unittest.main(exit=True)
-- 
2.34.1

Re: [PATCH v4 1/8] doc: Document station Affinities property

[Denis Kenzior]

Hi James,

> diff --git a/src/iwd.config.rst b/src/iwd.config.rst
> index d9c94e01..2d1f6dcd 100644
> --- a/src/iwd.config.rst
> +++ b/src/iwd.config.rst
> @@ -130,6 +130,22 @@ The group ``[General]`` contains general settings.
>          This value can be used to control how aggressively **iwd** roams when
>          connected to a 5GHz access point.
>   
> +   * - CriticalRoamThreshold
> +     - Value: rssi dBm value, from -100 to 1, default: **-80**

-100 to -1?

> +
> +       The threshold (for 2.4GHz) at which IWD will roam regardless of the
> +       affinity set to the current BSS. If the connected BSS has affinity
> +       (set in Station's Affinities list) the roam threshold will be lowed to
> +       this value and IWD will not attempt to roam (or roam scan) until either
> +       the affinity is cleared, or the signal drops below this threshold.
> +
> +
> +   * - CriticalRoamThreshold5G
> +     - Value: rssi dBm value, from -100 to 1, default: **-82**
> +

as above?

> +       This has the same effect as ``CriticalRoamThreshold``, but for the 5GHz
> +       band.
> +
>      * - RoamRetryInterval
>        - Value: unsigned int value in seconds (default: **60**)
>   

Regards,
-Denis