[nrf noup] Added DNS server refresh after adding new IPv6 address

The Wi-Fi device does not update mDNS queries after obtaining
new IPv6 GUA address, so for some time after assigning prefix,
the Thread Border Routers still use cached link-local address,
which is not routable.

Signed-off-by: Kamil Kasperczyk <kamil.kasperczyk@nordicsemi.no>

src/platform/nrfconnect/wifi/WiFiManager.cpp

@@ -136,12 +136,13 @@ const Map<wifi_iface_state, WiFiManager::StationStatus, 10>
  { WIFI_STATE_GROUP_HANDSHAKE, WiFiManager::StationStatus::PROVISIONING },
  { WIFI_STATE_COMPLETED, WiFiManager::StationStatus::FULLY_PROVISIONED } });
 
-const Map<uint32_t, WiFiManager::NetEventHandler, 5>
- WiFiManager::sEventHandlerMap({ { NET_EVENT_WIFI_SCAN_RESULT, WiFiManager::ScanResultHandler },
- { NET_EVENT_WIFI_SCAN_DONE, WiFiManager::ScanDoneHandler },
- { NET_EVENT_WIFI_CONNECT_RESULT, WiFiManager::ConnectHandler },
- { NET_EVENT_WIFI_DISCONNECT_RESULT, WiFiManager::DisconnectHandler },
- { NET_EVENT_WIFI_DISCONNECT_COMPLETE, WiFiManager::DisconnectHandler } });
+const Map<uint32_t, WiFiManager::NetEventHandler, 5> WiFiManager::sEventHandlerMap({
+ { NET_EVENT_WIFI_SCAN_RESULT, WiFiManager::ScanResultHandler },
+ { NET_EVENT_WIFI_SCAN_DONE, WiFiManager::ScanDoneHandler },
+ { NET_EVENT_WIFI_CONNECT_RESULT, WiFiManager::ConnectHandler },
+ { NET_EVENT_WIFI_DISCONNECT_RESULT, WiFiManager::DisconnectHandler },
+ { NET_EVENT_WIFI_DISCONNECT_COMPLETE, WiFiManager::DisconnectHandler },
+});
 
 void WiFiManager::WifiMgmtEventHandler(net_mgmt_event_callback * cb, uint32_t mgmtEvent, net_if * iface)
 {
@@ -154,14 +155,24 @@ void WiFiManager::WifiMgmtEventHandler(net_mgmt_event_callback * cb, uint32_t mg
  }
 }
 
+void WiFiManager::IPv6MgmtEventHandler(net_mgmt_event_callback * cb, uint32_t mgmtEvent, net_if * iface)
+{
+ if (((mgmtEvent == NET_EVENT_IPV6_ADDR_ADD) || (mgmtEvent == NET_EVENT_IPV6_ADDR_DEL)) && cb->info)
+ {
+ IPv6AddressChangeHandler(cb->info);
+ }
+}
+
 CHIP_ERROR WiFiManager::Init()
 {
  mNetIf = InetUtils::GetWiFiInterface();
  VerifyOrReturnError(mNetIf != nullptr, INET_ERROR_UNKNOWN_INTERFACE);
 
-
  net_mgmt_init_event_callback(&mWiFiMgmtClbk, WifiMgmtEventHandler, kWifiManagementEvents);
+ net_mgmt_init_event_callback(&mIPv6MgmtClbk, IPv6MgmtEventHandler, kIPv6ManagementEvents);
+
  net_mgmt_add_event_callback(&mWiFiMgmtClbk);
+ net_mgmt_add_event_callback(&mIPv6MgmtClbk);
 
  ChipLogDetail(DeviceLayer, "WiFiManager has been initialized");
 
@@ -469,6 +480,25 @@ void WiFiManager::DisconnectHandler(Platform::UniquePtr<uint8_t>)
  });
 }
 
+void WiFiManager::IPv6AddressChangeHandler(const void * data)
+{
+ const in6_addr * addr = reinterpret_cast<const in6_addr *>(data);
+
+ // Filter out link-local addresses that are not routable outside of a local network.
+ if (!net_ipv6_is_ll_addr(addr))
+ {
+ // This is needed to send mDNS queries containing updated IPv6 addresses.
+ ChipDeviceEvent event;
+ event.Type = DeviceEventType::kDnssdRestartNeeded;
+
+ CHIP_ERROR error = PlatformMgr().PostEvent(&event);
+ if (error != CHIP_NO_ERROR)
+ {
+ ChipLogError(DeviceLayer, "Cannot post event: %" CHIP_ERROR_FORMAT, error.Format());
+ }
+ }
+}
+
 WiFiManager::StationStatus WiFiManager::GetStationStatus() const
 {
  return WiFiManager::sStatusMap[mWiFiState];

src/platform/nrfconnect/wifi/WiFiManager.h

@@ -198,14 +198,18 @@ class WiFiManager
  constexpr static uint32_t kWifiManagementEvents = NET_EVENT_WIFI_SCAN_RESULT | NET_EVENT_WIFI_SCAN_DONE |
  NET_EVENT_WIFI_CONNECT_RESULT | NET_EVENT_WIFI_DISCONNECT_RESULT | NET_EVENT_WIFI_IFACE_STATUS;
 
+ constexpr static uint32_t kIPv6ManagementEvents = NET_EVENT_IPV6_ADDR_ADD | NET_EVENT_IPV6_ADDR_DEL;
+
  // Event handling
  static void WifiMgmtEventHandler(net_mgmt_event_callback * cb, uint32_t mgmtEvent, net_if * iface);
+ static void IPv6MgmtEventHandler(net_mgmt_event_callback * cb, uint32_t mgmtEvent, net_if * iface);
  static void ScanResultHandler(Platform::UniquePtr<uint8_t> data);
  static void ScanDoneHandler(Platform::UniquePtr<uint8_t> data);
  static void ConnectHandler(Platform::UniquePtr<uint8_t> data);
  static void DisconnectHandler(Platform::UniquePtr<uint8_t> data);
  static void PostConnectivityStatusChange(ConnectivityChange changeType);
  static void SendRouterSolicitation(System::Layer * layer, void * param);
+ static void IPv6AddressChangeHandler(const void * data);
 
  // Connection Recovery feature
  // This feature allows re-scanning and re-connecting the connection to the known network after
@@ -226,6 +230,7 @@ class WiFiManager
  wifi_iface_state mWiFiState;
  wifi_iface_state mCachedWiFiState;
  net_mgmt_event_callback mWiFiMgmtClbk{};
+ net_mgmt_event_callback mIPv6MgmtClbk{};
  ScanResultCallback mScanResultCallback{ nullptr };
  ScanDoneCallback mScanDoneCallback{ nullptr };
  WiFiNetwork mWantedNetwork{};