From dd3641f0544cdcf29dcc1f248c5992ec2d733fa9 Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Mon, 5 Feb 2024 17:37:23 +0200
Subject: [PATCH] Kernel: Cleanup ARPTable code

Packet process is now killed if ARPTable dies.

ARP wait loop now just reschecules so timeout actually works.
---
 kernel/include/kernel/Networking/ARPTable.h |  1 +
 kernel/kernel/Networking/ARPTable.cpp       | 19 ++++++++++++++-----
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/kernel/include/kernel/Networking/ARPTable.h b/kernel/include/kernel/Networking/ARPTable.h
index 499bbd39..ab4e99a6 100644
--- a/kernel/include/kernel/Networking/ARPTable.h
+++ b/kernel/include/kernel/Networking/ARPTable.h
@@ -31,6 +31,7 @@ namespace Kernel
 
 	public:
 		static BAN::ErrorOr<BAN::UniqPtr<ARPTable>> create();
+		~ARPTable();
 
 		BAN::ErrorOr<BAN::MACAddress> get_mac_from_ipv4(NetworkInterface&, BAN::IPv4Address);
 
diff --git a/kernel/kernel/Networking/ARPTable.cpp b/kernel/kernel/Networking/ARPTable.cpp
index ff9cdc4d..b9f23842 100644
--- a/kernel/kernel/Networking/ARPTable.cpp
+++ b/kernel/kernel/Networking/ARPTable.cpp
@@ -1,5 +1,6 @@
 #include <kernel/LockGuard.h>
 #include <kernel/Networking/ARPTable.h>
+#include <kernel/Scheduler.h>
 #include <kernel/Timer/Timer.h>
 
 namespace Kernel
@@ -32,12 +33,20 @@ namespace Kernel
 	{
 	}
 
+	ARPTable::~ARPTable()
+	{
+		if (m_process)
+			m_process->exit(0, SIGKILL);
+		m_process = nullptr;
+	}
+
 	BAN::ErrorOr<BAN::MACAddress> ARPTable::get_mac_from_ipv4(NetworkInterface& interface, BAN::IPv4Address ipv4_address)
 	{
+		if (ipv4_address == s_broadcast_ipv4)
+			return s_broadcast_mac;
+
 		{
 			LockGuard _(m_lock);
-			if (ipv4_address == s_broadcast_ipv4)
-				return s_broadcast_mac;
 			if (m_arp_table.contains(ipv4_address))
 				return m_arp_table[ipv4_address];
 		}
@@ -64,7 +73,7 @@ namespace Kernel
 
 		TRY(interface.send_raw_bytes(full_packet));
 
-		uint64_t timeout = SystemTimer::get().ms_since_boot() + 5'000;
+		uint64_t timeout = SystemTimer::get().ms_since_boot() + 1'000;
 		while (SystemTimer::get().ms_since_boot() < timeout)
 		{
 			{
@@ -72,10 +81,10 @@ namespace Kernel
 				if (m_arp_table.contains(ipv4_address))
 					return m_arp_table[ipv4_address];
 			}
-			TRY(Thread::current().block_or_eintr(m_pending_semaphore));
+			Scheduler::get().reschedule();
 		}
 
-		return BAN::Error::from_errno(EINVAL);
+		return BAN::Error::from_errno(ETIMEDOUT);
 	}
 
 	BAN::ErrorOr<void> ARPTable::handle_arp_packet(NetworkInterface& interface, const ARPPacket& packet)