Update dependencies

vendor/tailscale.com/wgengine/wgint/wgint.go

@@ -0,0 +1,108 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Package wgint provides somewhat shady access to wireguard-go
+// internals that don't (yet) have public APIs.
+package wgint
+
+import (
+	"reflect"
+	"sync/atomic"
+	"time"
+	"unsafe"
+
+	"github.com/tailscale/wireguard-go/device"
+)
+
+var (
+	offHandshake = getPeerStatsOffset("lastHandshakeNano")
+	offRxBytes   = getPeerStatsOffset("rxBytes")
+	offTxBytes   = getPeerStatsOffset("txBytes")
+
+	offHandshakeAttempts = getPeerHandshakeAttemptsOffset()
+)
+
+func getPeerStatsOffset(name string) uintptr {
+	peerType := reflect.TypeFor[device.Peer]()
+	field, ok := peerType.FieldByName(name)
+	if !ok {
+		panic("no " + name + " field in device.Peer")
+	}
+	if s := field.Type.String(); s != "atomic.Int64" && s != "atomic.Uint64" {
+		panic("unexpected type " + s + " of field " + name + " in device.Peer")
+	}
+	return field.Offset
+}
+
+func getPeerHandshakeAttemptsOffset() uintptr {
+	peerType := reflect.TypeFor[device.Peer]()
+	field, ok := peerType.FieldByName("timers")
+	if !ok {
+		panic("no timers field in device.Peer")
+	}
+	field2, ok := field.Type.FieldByName("handshakeAttempts")
+	if !ok {
+		panic("no handshakeAttempts field in device.Peer.timers")
+	}
+	if g, w := field2.Type.String(), "atomic.Uint32"; g != w {
+		panic("unexpected type " + g + " of field handshakeAttempts in device.Peer.timers; want " + w)
+	}
+	return field.Offset + field2.Offset
+}
+
+// peerLastHandshakeNano returns the last handshake time in nanoseconds since the
+// unix epoch.
+func peerLastHandshakeNano(peer *device.Peer) int64 {
+	return (*atomic.Int64)(unsafe.Add(unsafe.Pointer(peer), offHandshake)).Load()
+}
+
+// peerRxBytes returns the number of bytes received from this peer.
+func peerRxBytes(peer *device.Peer) uint64 {
+	return (*atomic.Uint64)(unsafe.Add(unsafe.Pointer(peer), offRxBytes)).Load()
+}
+
+// peerTxBytes returns the number of bytes sent to this peer.
+func peerTxBytes(peer *device.Peer) uint64 {
+	return (*atomic.Uint64)(unsafe.Add(unsafe.Pointer(peer), offTxBytes)).Load()
+}
+
+// peerHandshakeAttempts returns the number of WireGuard handshake attempts
+// made for the current handshake. It resets to zero before every new handshake.
+func peerHandshakeAttempts(peer *device.Peer) uint32 {
+	return (*atomic.Uint32)(unsafe.Add(unsafe.Pointer(peer), offHandshakeAttempts)).Load()
+}
+
+// Peer is a wrapper around a wireguard-go device.Peer pointer.
+type Peer struct {
+	p *device.Peer
+}
+
+// PeerOf returns a Peer wrapper around a wireguard-go device.Peer.
+func PeerOf(p *device.Peer) Peer {
+	return Peer{p}
+}
+
+// LastHandshake returns the last handshake time.
+//
+// If the handshake has never happened, it returns the zero value.
+func (p Peer) LastHandshake() time.Time {
+	if n := peerLastHandshakeNano(p.p); n != 0 {
+		return time.Unix(0, n)
+	}
+	return time.Time{}
+}
+
+func (p Peer) IsValid() bool { return p.p != nil }
+
+// TxBytes returns the number of bytes sent to this peer.
+func (p Peer) TxBytes() uint64 { return peerTxBytes(p.p) }
+
+// RxBytes returns the number of bytes received from this peer.
+func (p Peer) RxBytes() uint64 { return peerRxBytes(p.p) }
+
+// HandshakeAttempts returns the number of failed WireGuard handshake attempts
+// made for the current handshake. It resets to zero before every new handshake
+// and after a successful handshake.
+func (p Peer) HandshakeAttempts() uint32 {
+	return peerHandshakeAttempts(p.p)
+}