Kernel: Add support for route flags

Previously the routing table did not store the route flags. This
adds basic support and exposes them in the /proc directory so that a
userspace caller can query the route and identify the type of each
route.

3 files changed, 10 insertions, 8 deletions

diff --git a/Kernel/Net/IPv4Socket.cpp b/Kernel/Net/IPv4Socket.cpp
index 76f851899b..e9305a5adb 100644
--- a/Kernel/Net/IPv4Socket.cpp
+++ b/Kernel/Net/IPv4Socket.cpp
@@ -629,14 +629,14 @@ ErrorOr<void> IPv4Socket::ioctl(OpenFileDescription&, unsigned request, Userspac
                 return EPERM;
             if (route.rt_gateway.sa_family != AF_INET)
                 return EAFNOSUPPORT;
-            if ((route.rt_flags & (RTF_UP | RTF_GATEWAY)) != (RTF_UP | RTF_GATEWAY))
+            if (!(route.rt_flags & RTF_UP))
                 return EINVAL; // FIXME: Find the correct value to return
 
             auto destination = IPv4Address(((sockaddr_in&)route.rt_dst).sin_addr.s_addr);
             auto gateway = IPv4Address(((sockaddr_in&)route.rt_gateway).sin_addr.s_addr);
             auto genmask = IPv4Address(((sockaddr_in&)route.rt_genmask).sin_addr.s_addr);
 
-            return update_routing_table(destination, gateway, genmask, adapter, UpdateTable::Set);
+            return update_routing_table(destination, gateway, genmask, route.rt_flags, adapter, UpdateTable::Set);
         }
         case SIOCDELRT:
             if (!Process::current().is_superuser())
@@ -648,7 +648,7 @@ ErrorOr<void> IPv4Socket::ioctl(OpenFileDescription&, unsigned request, Userspac
             auto gateway = IPv4Address(((sockaddr_in&)route.rt_gateway).sin_addr.s_addr);
             auto genmask = IPv4Address(((sockaddr_in&)route.rt_genmask).sin_addr.s_addr);
 
-            return update_routing_table(destination, gateway, genmask, adapter, UpdateTable::Delete);
+            return update_routing_table(destination, gateway, genmask, route.rt_flags, adapter, UpdateTable::Delete);
         }
 
         return EINVAL;
diff --git a/Kernel/Net/Routing.cpp b/Kernel/Net/Routing.cpp
index 8c2396b3ad..a96a201a5c 100644
--- a/Kernel/Net/Routing.cpp
+++ b/Kernel/Net/Routing.cpp
@@ -135,9 +135,9 @@ SpinlockProtected<Route::RouteList>& routing_table()
     return *s_routing_table;
 }
 
-ErrorOr<void> update_routing_table(IPv4Address const& destination, IPv4Address const& gateway, IPv4Address const& netmask, RefPtr<NetworkAdapter> adapter, UpdateTable update)
+ErrorOr<void> update_routing_table(IPv4Address const& destination, IPv4Address const& gateway, IPv4Address const& netmask, u16 flags, RefPtr<NetworkAdapter> adapter, UpdateTable update)
 {
-    auto route_entry = adopt_ref_if_nonnull(new (nothrow) Route { destination, gateway, netmask, adapter.release_nonnull() });
+    auto route_entry = adopt_ref_if_nonnull(new (nothrow) Route { destination, gateway, netmask, flags, adapter.release_nonnull() });
     if (!route_entry)
         return ENOMEM;
 
diff --git a/Kernel/Net/Routing.h b/Kernel/Net/Routing.h
index b0db0baf2e..3d68a0f34c 100644
--- a/Kernel/Net/Routing.h
+++ b/Kernel/Net/Routing.h
@@ -15,22 +15,24 @@
 namespace Kernel {
 
 struct Route : public RefCounted<Route> {
-    Route(IPv4Address const& destination, IPv4Address const& gateway, IPv4Address const& netmask, NonnullRefPtr<NetworkAdapter> adapter)
+    Route(IPv4Address const& destination, IPv4Address const& gateway, IPv4Address const& netmask, u16 flags, NonnullRefPtr<NetworkAdapter> adapter)
         : destination(destination)
         , gateway(gateway)
         , netmask(netmask)
+        , flags(flags)
         , adapter(adapter)
     {
     }
 
     bool operator==(Route const& other) const
     {
-        return destination == other.destination && gateway == other.gateway && netmask == other.netmask && adapter.ptr() == other.adapter.ptr();
+        return destination == other.destination && gateway == other.gateway && netmask == other.netmask && flags == other.flags && adapter.ptr() == other.adapter.ptr();
     }
 
     const IPv4Address destination;
     const IPv4Address gateway;
     const IPv4Address netmask;
+    const u16 flags;
     NonnullRefPtr<NetworkAdapter> adapter;
 
     IntrusiveListNode<Route, RefPtr<Route>> route_list_node {};
@@ -50,7 +52,7 @@ enum class UpdateTable {
 };
 
 void update_arp_table(IPv4Address const&, MACAddress const&, UpdateTable update);
-ErrorOr<void> update_routing_table(IPv4Address const& destination, IPv4Address const& gateway, IPv4Address const& netmask, RefPtr<NetworkAdapter> const adapter, UpdateTable update);
+ErrorOr<void> update_routing_table(IPv4Address const& destination, IPv4Address const& gateway, IPv4Address const& netmask, u16 flags, RefPtr<NetworkAdapter> const adapter, UpdateTable update);
 
 enum class AllowUsingGateway {
     Yes,