Sync upstream

README.md

@@ -56,7 +56,7 @@ $ make
 
 ## License
 
-    Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+    Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
 
     Permission is hereby granted, free of charge, to any person obtaining a copy of
     this software and associated documentation files (the "Software"), to deal in

conn/bind_std.go

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn

conn/bind_windows.go

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn

conn/bindtest/bindtest.go

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package bindtest

conn/boundif_android.go

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn

conn/conn.go

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 // Package conn implements WireGuard's network connections.

conn/conn_test.go

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn

conn/controlfns.go

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn

conn/controlfns_linux.go

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn
@@ -13,6 +13,35 @@ import (
 	"golang.org/x/sys/unix"
 )
 
+// Taken from go/src/internal/syscall/unix/kernel_version_linux.go
+func kernelVersion() (major, minor int) {
+	var uname unix.Utsname
+	if err := unix.Uname(&uname); err != nil {
+		return
+	}
+
+	var (
+		values    [2]int
+		value, vi int
+	)
+	for _, c := range uname.Release {
+		if '0' <= c && c <= '9' {
+			value = (value * 10) + int(c-'0')
+		} else {
+			// Note that we're assuming N.N.N here.
+			// If we see anything else, we are likely to mis-parse it.
+			values[vi] = value
+			vi++
+			if vi >= len(values) {
+				break
+			}
+			value = 0
+		}
+	}
+
+	return values[0], values[1]
+}
+
 func init() {
 	controlFns = append(controlFns,
 
@@ -60,6 +89,17 @@ func init() {
 
 		// Attempt to enable UDP_GRO
 		func(network, address string, c syscall.RawConn) error {
+			// Kernels below 5.12 are missing 98184612aca0 ("net:
+			// udp: Add support for getsockopt(..., ..., UDP_GRO,
+			// ..., ...);"), which means we can't read this back
+			// later. We could pipe the return value through to
+			// the rest of the code, but UDP_GRO is kind of buggy
+			// anyway, so just gate this here.
+			major, minor := kernelVersion()
+			if major < 5 || (major == 5 && minor < 12) {
+				return nil
+			}
+
 			c.Control(func(fd uintptr) {
 				_ = unix.SetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_GRO, 1)
 			})

conn/controlfns_unix.go

@@ -2,7 +2,7 @@
 
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn

conn/controlfns_windows.go

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn

conn/default.go

@@ -2,7 +2,7 @@
 
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn

conn/errors_default.go

@@ -2,11 +2,11 @@
 
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn
 
-func errShouldDisableUDPGSO(err error) bool {
+func errShouldDisableUDPGSO(_ error) bool {
 	return false
 }

conn/errors_linux.go

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn

conn/features_default.go

@@ -3,13 +3,13 @@
 
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn
 
 import "net"
 
-func supportsUDPOffload(conn *net.UDPConn) (txOffload, rxOffload bool) {
+func supportsUDPOffload(_ *net.UDPConn) (txOffload, rxOffload bool) {
 	return
 }

conn/features_linux.go

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn

conn/gso_default.go

@@ -2,7 +2,7 @@
 
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn

conn/gso_linux.go

@@ -2,7 +2,7 @@
 
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn

conn/mark_default.go

@@ -2,7 +2,7 @@
 
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn

conn/mark_unix.go

@@ -2,7 +2,7 @@
 
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn

conn/sticky_default.go

@@ -2,7 +2,7 @@
 
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn

conn/sticky_linux.go

@@ -2,7 +2,7 @@
 
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn

conn/sticky_linux_test.go

@@ -2,7 +2,7 @@
 
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package conn

conn/winrio/rio_windows.go

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package winrio

device/allowedips.go

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
  */
 
 package device
@@ -223,45 +223,68 @@ func (table *AllowedIPs) EntriesForPeer(peer *Peer, cb func(prefix netip.Prefix)
 	}
 }
 
+func (node *trieEntry) remove() {
+	node.removeFromPeerEntries()
+	node.peer = nil
+	if node.child[0] != nil && node.child[1] != nil {
+		return
+	}
+	bit := 0
+	if node.child[0] == nil {
+		bit = 1
+	}
+	child := node.child[bit]
+	if child != nil {
+		child.parent = node.parent
+	}
+	*node.parent.parentBit = child
+	if node.child[0] != nil || node.child[1] != nil || node.parent.parentBitType > 1 {
+		node.zeroizePointers()
+		return
+	}
+	parent := (*trieEntry)(unsafe.Pointer(uintptr(unsafe.Pointer(node.parent.parentBit)) - unsafe.Offsetof(node.child) - unsafe.Sizeof(node.child[0])*uintptr(node.parent.parentBitType)))
+	if parent.peer != nil {
+		node.zeroizePointers()
+		return
+	}
+	child = parent.child[node.parent.parentBitType^1]
+	if child != nil {
+		child.parent = parent.parent
+	}
+	*parent.parent.parentBit = child
+	node.zeroizePointers()
+	parent.zeroizePointers()
+}
+
+func (table *AllowedIPs) Remove(prefix netip.Prefix, peer *Peer) {
+	table.mutex.Lock()
+	defer table.mutex.Unlock()
+	var node *trieEntry
+	var exact bool
+
+	if prefix.Addr().Is6() {
+		ip := prefix.Addr().As16()
+		node, exact = table.IPv6.nodePlacement(ip[:], uint8(prefix.Bits()))
+	} else if prefix.Addr().Is4() {
+		ip := prefix.Addr().As4()
+		node, exact = table.IPv4.nodePlacement(ip[:], uint8(prefix.Bits()))
+	} else {
+		panic(errors.New("removing unknown address type"))
+	}
+	if !exact || node == nil || peer != node.peer {
+		return
+	}
+	node.remove()
+}
+
 func (table *AllowedIPs) RemoveByPeer(peer *Peer) {
 	table.mutex.Lock()
 	defer table.mutex.Unlock()
 
 	var next *list.Element
 	for elem := peer.trieEntries.Front(); elem != nil; elem = next {
 		next = elem.Next()
-		node := elem.Value.(*trieEntry)
-
-		node.removeFromPeerEntries()
-		node.peer = nil
-		if node.child[0] != nil && node.child[1] != nil {
-			continue
-		}
-		bit := 0
-		if node.child[0] == nil {
-			bit = 1
-		}
-		child := node.child[bit]
-		if child != nil {
-			child.parent = node.parent
-		}
-		*node.parent.parentBit = child
-		if node.child[0] != nil || node.child[1] != nil || node.parent.parentBitType > 1 {
-			node.zeroizePointers()
-			continue
-		}
-		parent := (*trieEntry)(unsafe.Pointer(uintptr(unsafe.Pointer(node.parent.parentBit)) - unsafe.Offsetof(node.child) - unsafe.Sizeof(node.child[0])*uintptr(node.parent.parentBitType)))
-		if parent.peer != nil {
-			node.zeroizePointers()
-			continue
-		}
-		child = parent.child[node.parent.parentBitType^1]
-		if child != nil {
-			child.parent = parent.parent
-		}
-		*parent.parent.parentBit = child
-		node.zeroizePointers()
-		parent.zeroizePointers()
+		elem.Value.(*trieEntry).remove()
 	}
 }