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Kernel: Add support for route flags

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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.
This commit is contained in:
brapru 2022-05-09 07:23:02 -04:00 committed by Andreas Kling
parent 210c3f24cd
commit 7a4e41f8f8
Notes: sideshowbarker 2024-07-17 10:38:11 +09:00 
Author: https://github.com/brapru
Commit: https://github.com/SerenityOS/serenity/commit/7a4e41f8f8
Pull-request: https://github.com/SerenityOS/serenity/pull/13992
5 changed files with 12 additions and 8 deletions
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1
Kernel/API/POSIX/net/route.h
View File

@ -24,6 +24,7 @@ struct rtentry {
#define RTF_UP 0x1 /* do not delete the route */
#define RTF_GATEWAY 0x2 /* the route is a gateway and not an end host */
#define RTF_HOST 0x4 /* host entry (net otherwise) */
#ifdef __cplusplus
}

1
Kernel/GlobalProcessExposed.cpp
View File

@ -114,6 +114,7 @@ private:
TRY(obj.add("gateway", gateway->view()));
auto netmask = TRY(it.netmask.to_string());
TRY(obj.add("genmask", netmask->view()));
TRY(obj.add("flags", it.flags));
TRY(obj.add("interface", it.adapter->name()));
TRY(obj.finish());
}

6
Kernel/Net/IPv4Socket.cpp
View File

@ -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;

4
Kernel/Net/Routing.cpp
View File

@ -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;

8
Kernel/Net/Routing.h
View File

@ -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,