From 1fc9a7062c7e66bd0fd7a817a84bcbe2bb1e4940 Mon Sep 17 00:00:00 2001
From: retu2libc <christheyankee@gmail.com>
Date: Sun, 25 Feb 2024 16:13:41 -0500
Subject: [PATCH] Drop ethernet frames not destined for us or broadcast

---
 src/Home/Net/Utilities/NetHandler.ZC | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/Home/Net/Utilities/NetHandler.ZC b/src/Home/Net/Utilities/NetHandler.ZC
index fad866ad..f7dc2061 100755
--- a/src/Home/Net/Utilities/NetHandler.ZC
+++ b/src/Home/Net/Utilities/NetHandler.ZC
@@ -37,6 +37,16 @@ U0 NetQueueEntryHandle(CNetQueueEntry *entry)
 
 	EthernetFrameParse(&ethernet_frame, entry->frame, entry->packet_length);
 
+	U8 *mac = EthernetMACGet();
+	Bool is_our_mac = !MemCompare(mac, ethernet_frame.destination_address, MAC_ADDRESS_LENGTH); // check the RX packet MAC against local MAC
+	Bool is_broadcast = !MemCompare(ethernet_globals.ethernet_broadcast, ethernet_frame.destination_address, MAC_ADDRESS_LENGTH); // check the RX packet MAC against broadcast MAC
+
+	if (!is_our_mac && !is_broadcast)
+	{
+		NetLog("HANDLE NETQUEUE ENTRY: Not for us, discarding.");
+		return;
+	}
+
 	switch (ethernet_frame.ethertype)
 	{
 		case ETHERTYPE_ARP: