Limiting length of Wi-Fi BH links chains

src/cntlr.c

@@ -477,6 +477,71 @@ static int forall_node_update_neighbors(struct controller *c)
 }
 #endif
 
+
+void cntrl_send_max_wifi_bh_hops_policy(struct controller *c)
+{
+	struct node *node;
+
+	if (c->cfg.max_node_bh_hops == 0)
+		return;
+
+
+	trace("%s: max_node_bh_hops %d\n",
+		  __func__, c->cfg.max_node_bh_hops);
+
+	list_for_each_entry(node, &c->nodelist, list) {
+		enum bh_control {
+			BLOCK = 0x00,
+			UNBLOCK = 0x01
+		} bh_control = UNBLOCK;
+		struct bh_topology_dev *bh_topo_dev =
+			find_bh_topology_device(node->alid);
+		struct netif_radio *radio;
+
+		if (!bh_topo_dev) {
+			err("%s: device not found in bh topo model, logical error.\n", __func__);
+			continue;
+		}
+
+		if (bh_topo_dev->bh_info.level_in_tree == UNKNOWN_TREE_LEVEL) {
+			warn("%s: Level in BH treee unknown for: " MACFMT "\n", __func__, MAC2STR(node->alid));
+			continue;
+		}
+
+		if (c->cfg.max_node_bh_hops <= bh_topo_dev->bh_info.wifi_hops_from_root)
+			bh_control = BLOCK;
+
+		list_for_each_entry(radio, &node->radiolist, list) {
+			struct netif_iface *iface;
+
+			list_for_each_entry(iface, &radio->iflist, list) {
+				/* cppcheck-suppress uninitvar */
+				if (iface->bss->is_bbss) {
+					const uint8_t NO_VALIDITY_PERIOD = 0;
+					uint8_t ALL_BSTAS[6] = {
+						0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+					};
+					uint16_t mid;
+
+					trace("%s: sending BH assoc_mode %s, node al_mac: " MACFMT
+					      ", wifi_hops_from_root: %d, bssid: " MACFMT"\n",
+					      __func__,
+					      bh_control ? "UNBLOCK" : "BLOCK",
+					      MAC2STR(node->alid),
+					      bh_topo_dev->bh_info.wifi_hops_from_root,
+					      MAC2STR(iface->bss->bssid));
+
+					cntlr_send_client_assoc_ctrl_request(
+						c, node->alid, iface->bss->bssid,
+						bh_control, NO_VALIDITY_PERIOD, 1,
+						ALL_BSTAS, &mid);
+				}
+			}
+		}
+	}
+}
+
+
 void cntlr_update_sta_steer_counters(struct controller *c,
 				     uint8_t *sta_mac,
 				     uint8_t *src_bssid,