network: add APIs to blacklist BSS's per-network

Certain error conditions require that a BSS be blacklisted only for
the duration of the current connection. The existing blacklist
does not allow for this, and since this blacklist is shared between
all interfaces it doesnt make sense to use it for this purpose.

Instead, each network object can contain its own blacklist of
scan_bss elements. New elements can be added with network_blacklist_add.
The blacklist is cleared when the connection completes, either
successfully or not.

Now inside network_bss_select both the per-network blacklist as well as
the global blacklist will be checked before returning a BSS.

src/network.c

@@ -59,6 +59,7 @@ struct network {
 	struct l_queue *bss_list;
 	struct l_settings *settings;
 	struct l_queue *secrets;
+	struct l_queue *blacklist; /* temporary blacklist for BSS's */
 	bool update_psk:1;  /* Whether PSK should be written to storage */
 	bool ask_passphrase:1; /* Whether we should force-ask agent */
 	int rank;
@@ -153,6 +154,8 @@ void network_connected(struct network *network)
 
 	l_queue_foreach_remove(network->secrets,
 				network_secret_check_cacheable, network);
+
+	l_queue_clear(network->blacklist, NULL);
 }
 
 void network_disconnected(struct network *network)
@@ -294,6 +297,7 @@ struct network *network_create(struct station *station, const char *ssid,
 	network->info = network_info_get(ssid, security);
 
 	network->bss_list = l_queue_new();
+	network->blacklist = l_queue_new();
 
 	return network;
 }
@@ -614,6 +618,8 @@ void network_connect_failed(struct network *network)
 
 	l_queue_destroy(network->secrets, eap_secret_info_free);
 	network->secrets = NULL;
+
+	l_queue_clear(network->blacklist, NULL);
 }
 
 bool network_bss_add(struct network *network, struct scan_bss *bss)
@@ -649,6 +655,11 @@ struct scan_bss *network_bss_find_by_addr(struct network *network,
 	return NULL;
 }
 
+static bool match_bss(const void *a, const void *b)
+{
+	return a == b;
+}
+
 struct scan_bss *network_bss_select(struct network *network,
 						bool fallback_to_blacklist)
 {
@@ -681,6 +692,10 @@ struct scan_bss *network_bss_select(struct network *network,
 		if (!candidate)
 			candidate = bss;
 
+		/* check if temporarily blacklisted */
+		if (l_queue_find(network->blacklist, match_bss, bss))
+			continue;
+
 		if (!blacklist_contains_bss(bss->addr))
 			return bss;
 	}
@@ -1145,6 +1160,11 @@ reply_error:
 	dbus_pending_reply(&message, error);
 }
 
+void network_blacklist_add(struct network *network, struct scan_bss *bss)
+{
+	l_queue_push_head(network->blacklist, bss);
+}
+
 static bool network_property_get_name(struct l_dbus *dbus,
 					struct l_dbus_message *message,
 					struct l_dbus_message_builder *builder,
@@ -1282,6 +1302,8 @@ void network_remove(struct network *network, int reason)
 	l_queue_destroy(network->bss_list, NULL);
 	network_info_put(network->info);
 
+	l_queue_destroy(network->blacklist, NULL);
+
 	l_free(network);
 }
 

src/network.h

@@ -68,6 +68,8 @@ void network_rank_update(struct network *network, bool connected);
 void network_connect_new_hidden_network(struct network *network,
 						struct l_dbus_message *message);
 
+void network_blacklist_add(struct network *network, struct scan_bss *bss);
+
 struct network_info {
 	char ssid[33];
 	enum security type;