Paper/patches/server/0711-Add-packet-limiter-config.patch
2023-02-07 07:55:53 -08:00

99 lines
5.1 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Fri, 30 Oct 2020 22:37:16 -0700
Subject: [PATCH] Add packet limiter config
Example config:
packet-limiter:
kick-message: '&cSent too many packets'
limits:
all:
interval: 7.0
max-packet-rate: 500.0
ServerboundPlaceRecipePacket:
interval: 4.0
max-packet-rate: 5.0
action: DROP
all section refers to all incoming packets, the action for all is
hard coded to KICK.
For specific limits, the section name is the class's name,
and an action can be defined: DROP or KICK
If interval or rate are less-than 0, the limit is ignored
diff --git a/src/main/java/net/minecraft/network/Connection.java b/src/main/java/net/minecraft/network/Connection.java
index 46153b8e5823959e17621bbebd414d8998b77fb5..fa0845ea094714c320617d3a39efac759ddbbd36 100644
--- a/src/main/java/net/minecraft/network/Connection.java
+++ b/src/main/java/net/minecraft/network/Connection.java
@@ -154,6 +154,22 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
}
}
// Paper end - allow controlled flushing
+ // Paper start - packet limiter
+ protected final Object PACKET_LIMIT_LOCK = new Object();
+ protected final @Nullable io.papermc.paper.util.IntervalledCounter allPacketCounts = io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.allPackets.isEnabled() ? new io.papermc.paper.util.IntervalledCounter(
+ (long)(io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.allPackets.interval() * 1.0e9)
+ ) : null;
+ protected final java.util.Map<Class<? extends net.minecraft.network.protocol.Packet<?>>, io.papermc.paper.util.IntervalledCounter> packetSpecificLimits = new java.util.HashMap<>();
+
+ private boolean stopReadingPackets;
+ private void killForPacketSpam() {
+ this.sendPacket(new ClientboundDisconnectPacket(io.papermc.paper.adventure.PaperAdventure.asVanilla(io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.kickMessage)), PacketSendListener.thenRun(() -> {
+ this.disconnect(io.papermc.paper.adventure.PaperAdventure.asVanilla(io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.kickMessage));
+ }));
+ this.setReadOnly();
+ this.stopReadingPackets = true;
+ }
+ // Paper end - packet limiter
public Connection(PacketFlow side) {
this.receiving = side;
@@ -234,6 +250,45 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
protected void channelRead0(ChannelHandlerContext channelhandlercontext, Packet<?> packet) {
if (this.channel.isOpen()) {
+ // Paper start - packet limiter
+ if (this.stopReadingPackets) {
+ return;
+ }
+ if (this.allPacketCounts != null ||
+ io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.overrides.containsKey(packet.getClass())) {
+ long time = System.nanoTime();
+ synchronized (PACKET_LIMIT_LOCK) {
+ if (this.allPacketCounts != null) {
+ this.allPacketCounts.updateAndAdd(1, time);
+ if (this.allPacketCounts.getRate() >= io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.allPackets.maxPacketRate()) {
+ this.killForPacketSpam();
+ return;
+ }
+ }
+
+ for (Class<?> check = packet.getClass(); check != Object.class; check = check.getSuperclass()) {
+ io.papermc.paper.configuration.GlobalConfiguration.PacketLimiter.PacketLimit packetSpecificLimit =
+ io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.overrides.get(check);
+ if (packetSpecificLimit == null || !packetSpecificLimit.isEnabled()) {
+ continue;
+ }
+ io.papermc.paper.util.IntervalledCounter counter = this.packetSpecificLimits.computeIfAbsent((Class)check, (clazz) -> {
+ return new io.papermc.paper.util.IntervalledCounter((long)(packetSpecificLimit.interval() * 1.0e9));
+ });
+ counter.updateAndAdd(1, time);
+ if (counter.getRate() >= packetSpecificLimit.maxPacketRate()) {
+ switch (packetSpecificLimit.action()) {
+ case DROP:
+ return;
+ case KICK:
+ this.killForPacketSpam();
+ return;
+ }
+ }
+ }
+ }
+ }
+ // Paper end - packet limiter
try {
Connection.genericsFtw(packet, this.packetListener);
} catch (RunningOnDifferentThreadException cancelledpackethandleexception) {