AirportItlwm: Add another hack to fake that the provider is IOSkywalk…

…NetworkInterface, to avoid skywalkfamily instance cast panic.
OpenIntelWireless · Feb 5, 2024 · 3e1624d · 3e1624d
1 parent 3b8f766
commit 3e1624d
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Showing 2 changed files with 24 additions and 0 deletions.
diff --git a/AirportItlwm/AirportItlwmEthernetInterface.cpp b/AirportItlwm/AirportItlwmEthernetInterface.cpp
@@ -20,6 +20,7 @@ initWithSkywalkInterfaceAndProvider(IONetworkController *controller, IO80211Skyw
     bool ret = super::init(controller);
     if (ret)
         this->interface = interface;
+    this->isAttach = false;
     return ret;
 }
 
@@ -44,9 +45,26 @@ attachToDataLinkLayer( IOOptionBits options, void *parameter )
         interface->prepareBSDInterface(getIfnet(), 0);
 //        ret = bpf_attach(getIfnet(), DLT_RAW, 0x48, &AirportItlwmEthernetInterface::bpfOutputPacket, &AirportItlwmEthernetInterface::bpfTap);
     }
+    isAttach = true;
     return ret;
 }
 
+void AirportItlwmEthernetInterface::
+detachFromDataLinkLayer(IOOptionBits options, void *parameter)
+{
+    super::detachFromDataLinkLayer(options, parameter);
+    isAttach = false;
+}
+
+/**
+ Add another hack to fake that the provider is IOSkywalkNetworkInterface, to avoid skywalkfamily instance cast panic.
+ */
+IOService *AirportItlwmEthernetInterface::
+getProvider() const
+{
+    return isAttach ? this->interface : super::getProvider();
+}
+
 errno_t AirportItlwmEthernetInterface::
 bpfOutputPacket(ifnet_t interface, u_int32_t data_link_type, mbuf_t packet)
 {

diff --git a/AirportItlwm/AirportItlwmEthernetInterface.hpp b/AirportItlwm/AirportItlwmEthernetInterface.hpp
@@ -25,6 +25,9 @@ class AirportItlwmEthernetInterface : public IOEthernetInterface {
     virtual IOReturn attachToDataLinkLayer( IOOptionBits options,
                                             void *       parameter ) override;
 
+    virtual void     detachFromDataLinkLayer( IOOptionBits options,
+                                              void *       parameter ) override;
+
     virtual bool initWithSkywalkInterfaceAndProvider(IONetworkController *controller, IO80211SkywalkInterface *interface);
 
     virtual bool setLinkState(IO80211LinkState state);
@@ -41,8 +44,11 @@ class AirportItlwmEthernetInterface : public IOEthernetInterface {
                                  IOOptionBits    options = 0,
                                  void *          param   = 0 ) override;
 
+    virtual IOService * getProvider( void ) const override;
+
 private:
     IO80211SkywalkInterface *interface;
+    bool isAttach;
 };
 
 #endif /* AirportItlwmEthernetInterface_hpp */