Kernel: Introduce the NetworkingManagement singleton

Instead of initializing network adapters in init.cpp, let's move that
logic into a separate class to handle this.
Also, it seems like a good idea to shift responsiblity on enumeration
of network adapters after the boot process, so this singleton will take
care of finding the appropriate network adapter when asked to with an
IPv4 address or interface name.

With this change being merged, we simplify the creation logic of
NetworkAdapter derived classes, so we enumerate the PCI bus only once,
searching for driver candidates when doing so, and we let each driver
to test if it is resposible for the specified PCI device.

1 files changed, 6 insertions, 5 deletions

diff --git a/Kernel/Net/Routing.cpp b/Kernel/Net/Routing.cpp
index 41f7e94587..90d7d268fe 100644
--- a/Kernel/Net/Routing.cpp
+++ b/Kernel/Net/Routing.cpp
@@ -9,6 +9,7 @@
 #include <Kernel/Debug.h>
 #include <Kernel/Net/LoopbackAdapter.h>
 #include <Kernel/Net/NetworkTask.h>
+#include <Kernel/Net/NetworkingManagement.h>
 #include <Kernel/Net/Routing.h>
 #include <Kernel/Thread.h>
 
@@ -142,9 +143,9 @@ RoutingDecision route_to(const IPv4Address& target, const IPv4Address& source, c
     };
 
     if (target[0] == 0 && target[1] == 0 && target[2] == 0 && target[3] == 0)
-        return if_matches(LoopbackAdapter::the(), LoopbackAdapter::the().mac_address());
+        return if_matches(*NetworkingManagement::the().loopback_adapter(), NetworkingManagement::the().loopback_adapter()->mac_address());
     if (target[0] == 127)
-        return if_matches(LoopbackAdapter::the(), LoopbackAdapter::the().mac_address());
+        return if_matches(*NetworkingManagement::the().loopback_adapter(), NetworkingManagement::the().loopback_adapter()->mac_address());
 
     auto target_addr = target.to_u32();
     auto source_addr = source.to_u32();
@@ -152,12 +153,12 @@ RoutingDecision route_to(const IPv4Address& target, const IPv4Address& source, c
     RefPtr<NetworkAdapter> local_adapter = nullptr;
     RefPtr<NetworkAdapter> gateway_adapter = nullptr;
 
-    NetworkAdapter::for_each([source_addr, &target_addr, &local_adapter, &gateway_adapter, &matches, &through](auto& adapter) {
+    NetworkingManagement::the().for_each([source_addr, &target_addr, &local_adapter, &gateway_adapter, &matches, &through](NetworkAdapter& adapter) {
         auto adapter_addr = adapter.ipv4_address().to_u32();
         auto adapter_mask = adapter.ipv4_netmask().to_u32();
 
         if (target_addr == adapter_addr) {
-            local_adapter = LoopbackAdapter::the();
+            local_adapter = NetworkingManagement::the().loopback_adapter();
             return;
         }
 
@@ -213,7 +214,7 @@ RoutingDecision route_to(const IPv4Address& target, const IPv4Address& source, c
     if (target_addr == 0xffffffff && matches(adapter))
         return { adapter, { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff } };
 
-    if (adapter == LoopbackAdapter::the())
+    if (adapter == NetworkingManagement::the().loopback_adapter())
         return { adapter, adapter->mac_address() };
 
     if ((target_addr & IPv4Address { 240, 0, 0, 0 }.to_u32()) == IPv4Address { 224, 0, 0, 0 }.to_u32())