mirror of
https://github.com/tailscale/tailscale.git
synced 2024-12-04 23:45:34 +00:00
2925 lines
90 KiB
Go
2925 lines
90 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Package magicsock implements a socket that can change its communication path while
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// in use, actively searching for the best way to communicate.
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package magicsock
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import (
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"bufio"
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"context"
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"errors"
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"fmt"
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"io"
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"net"
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"net/netip"
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"runtime"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"github.com/tailscale/wireguard-go/conn"
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"go4.org/mem"
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"golang.org/x/net/ipv4"
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"golang.org/x/net/ipv6"
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"tailscale.com/control/controlknobs"
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"tailscale.com/disco"
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"tailscale.com/envknob"
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"tailscale.com/health"
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"tailscale.com/hostinfo"
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"tailscale.com/ipn/ipnstate"
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"tailscale.com/net/connstats"
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"tailscale.com/net/interfaces"
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"tailscale.com/net/netcheck"
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"tailscale.com/net/neterror"
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"tailscale.com/net/netmon"
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"tailscale.com/net/netns"
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"tailscale.com/net/packet"
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"tailscale.com/net/ping"
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"tailscale.com/net/portmapper"
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"tailscale.com/net/sockstats"
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"tailscale.com/net/stun"
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"tailscale.com/net/tstun"
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"tailscale.com/syncs"
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"tailscale.com/tailcfg"
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"tailscale.com/tstime"
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"tailscale.com/tstime/mono"
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"tailscale.com/types/key"
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"tailscale.com/types/lazy"
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"tailscale.com/types/logger"
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"tailscale.com/types/netmap"
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"tailscale.com/types/nettype"
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"tailscale.com/types/views"
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"tailscale.com/util/clientmetric"
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"tailscale.com/util/mak"
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"tailscale.com/util/ringbuffer"
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"tailscale.com/util/set"
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"tailscale.com/util/testenv"
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"tailscale.com/util/uniq"
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"tailscale.com/wgengine/capture"
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)
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const (
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// These are disco.Magic in big-endian form, 4 then 2 bytes. The
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// BPF filters need the magic in this format to match on it. Used
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// only in magicsock_linux.go, but defined here so that the test
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// which verifies this is the correct magic doesn't also need a
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// _linux variant.
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discoMagic1 = 0x5453f09f
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discoMagic2 = 0x92ac
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// UDP socket read/write buffer size (7MB). The value of 7MB is chosen as it
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// is the max supported by a default configuration of macOS. Some platforms
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// will silently clamp the value.
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socketBufferSize = 7 << 20
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)
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// A Conn routes UDP packets and actively manages a list of its endpoints.
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type Conn struct {
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// This block mirrors the contents and field order of the Options
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// struct. Initialized once at construction, then constant.
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logf logger.Logf
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epFunc func([]tailcfg.Endpoint)
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derpActiveFunc func()
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idleFunc func() time.Duration // nil means unknown
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testOnlyPacketListener nettype.PacketListener
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noteRecvActivity func(key.NodePublic) // or nil, see Options.NoteRecvActivity
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netMon *netmon.Monitor // or nil
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controlKnobs *controlknobs.Knobs // or nil
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// ================================================================
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// No locking required to access these fields, either because
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// they're static after construction, or are wholly owned by a
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// single goroutine.
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connCtx context.Context // closed on Conn.Close
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connCtxCancel func() // closes connCtx
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donec <-chan struct{} // connCtx.Done()'s to avoid context.cancelCtx.Done()'s mutex per call
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// pconn4 and pconn6 are the underlying UDP sockets used to
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// send/receive packets for wireguard and other magicsock
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// protocols.
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pconn4 RebindingUDPConn
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pconn6 RebindingUDPConn
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receiveBatchPool sync.Pool
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// closeDisco4 and closeDisco6 are io.Closers to shut down the raw
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// disco packet receivers. If nil, no raw disco receiver is
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// running for the given family.
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closeDisco4 io.Closer
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closeDisco6 io.Closer
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// netChecker is the prober that discovers local network
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// conditions, including the closest DERP relay and NAT mappings.
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netChecker *netcheck.Client
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// portMapper is the NAT-PMP/PCP/UPnP prober/client, for requesting
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// port mappings from NAT devices.
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portMapper *portmapper.Client
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// derpRecvCh is used by receiveDERP to read DERP messages.
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// It must have buffer size > 0; see issue 3736.
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derpRecvCh chan derpReadResult
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// bind is the wireguard-go conn.Bind for Conn.
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bind *connBind
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// ============================================================
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// Fields that must be accessed via atomic load/stores.
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// noV4 and noV6 are whether IPv4 and IPv6 are known to be
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// missing. They're only used to suppress log spam. The name
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// is named negatively because in early start-up, we don't yet
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// necessarily have a netcheck.Report and don't want to skip
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// logging.
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noV4, noV6 atomic.Bool
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silentDiscoOn atomic.Bool // whether silent disco is enabled
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// noV4Send is whether IPv4 UDP is known to be unable to transmit
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// at all. This could happen if the socket is in an invalid state
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// (as can happen on darwin after a network link status change).
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noV4Send atomic.Bool
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// networkUp is whether the network is up (some interface is up
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// with IPv4 or IPv6). It's used to suppress log spam and prevent
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// new connection that'll fail.
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networkUp atomic.Bool
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// Whether debugging logging is enabled.
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debugLogging atomic.Bool
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// havePrivateKey is whether privateKey is non-zero.
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havePrivateKey atomic.Bool
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publicKeyAtomic syncs.AtomicValue[key.NodePublic] // or NodeKey zero value if !havePrivateKey
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// derpMapAtomic is the same as derpMap, but without requiring
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// sync.Mutex. For use with NewRegionClient's callback, to avoid
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// lock ordering deadlocks. See issue 3726 and mu field docs.
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derpMapAtomic atomic.Pointer[tailcfg.DERPMap]
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lastNetCheckReport atomic.Pointer[netcheck.Report]
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// port is the preferred port from opts.Port; 0 means auto.
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port atomic.Uint32
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// peerMTUEnabled is whether path MTU discovery to peers is enabled.
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peerMTUEnabled atomic.Bool
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// stats maintains per-connection counters.
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stats atomic.Pointer[connstats.Statistics]
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// captureHook, if non-nil, is the pcap logging callback when capturing.
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captureHook syncs.AtomicValue[capture.Callback]
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// discoPrivate is the private naclbox key used for active
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// discovery traffic. It is always present, and immutable.
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discoPrivate key.DiscoPrivate
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// public of discoPrivate. It is always present and immutable.
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discoPublic key.DiscoPublic
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// ShortString of discoPublic (to save logging work later). It is always
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// present and immutable.
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discoShort string
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// ============================================================
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// mu guards all following fields; see userspaceEngine lock
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// ordering rules against the engine. For derphttp, mu must
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// be held before derphttp.Client.mu.
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mu sync.Mutex
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muCond *sync.Cond
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closed bool // Close was called
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closing atomic.Bool // Close is in progress (or done)
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// derpCleanupTimer is the timer that fires to occasionally clean
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// up idle DERP connections. It's only used when there is a non-home
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// DERP connection in use.
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derpCleanupTimer *time.Timer
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// derpCleanupTimerArmed is whether derpCleanupTimer is
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// scheduled to fire within derpCleanStaleInterval.
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derpCleanupTimerArmed bool
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// periodicReSTUNTimer, when non-nil, is an AfterFunc timer
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// that will call Conn.doPeriodicSTUN.
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periodicReSTUNTimer *time.Timer
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// endpointsUpdateActive indicates that updateEndpoints is
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// currently running. It's used to deduplicate concurrent endpoint
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// update requests.
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endpointsUpdateActive bool
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// wantEndpointsUpdate, if non-empty, means that a new endpoints
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// update should begin immediately after the currently-running one
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// completes. It can only be non-empty if
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// endpointsUpdateActive==true.
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wantEndpointsUpdate string // true if non-empty; string is reason
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// lastEndpoints records the endpoints found during the previous
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// endpoint discovery. It's used to avoid duplicate endpoint
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// change notifications.
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lastEndpoints []tailcfg.Endpoint
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// lastEndpointsTime is the last time the endpoints were updated,
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// even if there was no change.
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lastEndpointsTime time.Time
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// onEndpointRefreshed are funcs to run (in their own goroutines)
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// when endpoints are refreshed.
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onEndpointRefreshed map[*endpoint]func()
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// endpointTracker tracks the set of cached endpoints that we advertise
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// for a period of time before withdrawing them.
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endpointTracker endpointTracker
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// peerSet is the set of peers that are currently configured in
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// WireGuard. These are not used to filter inbound or outbound
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// traffic at all, but only to track what state can be cleaned up
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// in other maps below that are keyed by peer public key.
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peerSet set.Set[key.NodePublic]
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// peerMap tracks the networkmap Node entity for each peer
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// by node key, node ID, and discovery key.
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peerMap peerMap
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// discoInfo is the state for an active DiscoKey.
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discoInfo map[key.DiscoPublic]*discoInfo
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// netInfoFunc is a callback that provides a tailcfg.NetInfo when
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// discovered network conditions change.
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//
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// TODO(danderson): why can't it be set at construction time?
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// There seem to be a few natural places in ipn/local.go to
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// swallow untimely invocations.
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netInfoFunc func(*tailcfg.NetInfo) // nil until set
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// netInfoLast is the NetInfo provided in the last call to
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// netInfoFunc. It's used to deduplicate calls to netInfoFunc.
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//
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// TODO(danderson): should all the deduping happen in
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// ipn/local.go? We seem to be doing dedupe at several layers, and
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// magicsock could do with any complexity reduction it can get.
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netInfoLast *tailcfg.NetInfo
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derpMap *tailcfg.DERPMap // nil (or zero regions/nodes) means DERP is disabled
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peers views.Slice[tailcfg.NodeView] // from last SetNetworkMap update
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lastFlags debugFlags // at time of last SetNetworkMap
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firstAddrForTest netip.Addr // from last SetNetworkMap update; for tests only
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privateKey key.NodePrivate // WireGuard private key for this node
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everHadKey bool // whether we ever had a non-zero private key
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myDerp int // nearest DERP region ID; 0 means none/unknown
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homeless bool // if true, don't try to find & stay conneted to a DERP home (myDerp will stay 0)
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derpStarted chan struct{} // closed on first connection to DERP; for tests & cleaner Close
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activeDerp map[int]activeDerp // DERP regionID -> connection to a node in that region
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prevDerp map[int]*syncs.WaitGroupChan
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// derpRoute contains optional alternate routes to use as an
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// optimization instead of contacting a peer via their home
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// DERP connection. If they sent us a message on a different
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// DERP connection (which should really only be on our DERP
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// home connection, or what was once our home), then we
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// remember that route here to optimistically use instead of
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// creating a new DERP connection back to their home.
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derpRoute map[key.NodePublic]derpRoute
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// peerLastDerp tracks which DERP node we last used to speak with a
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// peer. It's only used to quiet logging, so we only log on change.
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peerLastDerp map[key.NodePublic]int
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// wgPinger is the WireGuard only pinger used for latency measurements.
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wgPinger lazy.SyncValue[*ping.Pinger]
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}
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// SetDebugLoggingEnabled controls whether spammy debug logging is enabled.
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//
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// Note that this is currently independent from the log levels, even though
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// they're pretty correlated: debugging logs should be [v1] (or higher), but
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// some non-debug logs may also still have a [vN] annotation. The [vN] level
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// controls which gets shown in stderr. The dlogf method, on the other hand,
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// controls which gets even printed or uploaded at any level.
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func (c *Conn) SetDebugLoggingEnabled(v bool) {
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c.debugLogging.Store(v)
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}
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// dlogf logs a debug message if debug logging is enabled via SetDebugLoggingEnabled.
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func (c *Conn) dlogf(format string, a ...any) {
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if c.debugLogging.Load() {
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c.logf(format, a...)
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}
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}
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// Options contains options for Listen.
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type Options struct {
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// Logf optionally provides a log function to use.
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// Must not be nil.
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Logf logger.Logf
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// Port is the port to listen on.
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// Zero means to pick one automatically.
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Port uint16
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// EndpointsFunc optionally provides a func to be called when
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// endpoints change. The called func does not own the slice.
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EndpointsFunc func([]tailcfg.Endpoint)
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// DERPActiveFunc optionally provides a func to be called when
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// a connection is made to a DERP server.
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DERPActiveFunc func()
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// IdleFunc optionally provides a func to return how long
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// it's been since a TUN packet was sent or received.
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IdleFunc func() time.Duration
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// TestOnlyPacketListener optionally specifies how to create PacketConns.
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// Only used by tests.
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TestOnlyPacketListener nettype.PacketListener
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// NoteRecvActivity, if provided, is a func for magicsock to call
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// whenever it receives a packet from a a peer if it's been more
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// than ~10 seconds since the last one. (10 seconds is somewhat
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// arbitrary; the sole user just doesn't need or want it called on
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// every packet, just every minute or two for WireGuard timeouts,
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// and 10 seconds seems like a good trade-off between often enough
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// and not too often.)
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// The provided func is likely to call back into
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// Conn.ParseEndpoint, which acquires Conn.mu. As such, you should
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// not hold Conn.mu while calling it.
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NoteRecvActivity func(key.NodePublic)
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// NetMon is the network monitor to use.
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// With one, the portmapper won't be used.
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NetMon *netmon.Monitor
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// ControlKnobs are the set of control knobs to use.
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// If nil, they're ignored and not updated.
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ControlKnobs *controlknobs.Knobs
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}
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func (o *Options) logf() logger.Logf {
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if o.Logf == nil {
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panic("must provide magicsock.Options.logf")
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}
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return o.Logf
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}
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func (o *Options) endpointsFunc() func([]tailcfg.Endpoint) {
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if o == nil || o.EndpointsFunc == nil {
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return func([]tailcfg.Endpoint) {}
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}
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return o.EndpointsFunc
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}
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func (o *Options) derpActiveFunc() func() {
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if o == nil || o.DERPActiveFunc == nil {
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return func() {}
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}
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return o.DERPActiveFunc
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}
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// newConn is the error-free, network-listening-side-effect-free based
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// of NewConn. Mostly for tests.
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func newConn() *Conn {
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discoPrivate := key.NewDisco()
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c := &Conn{
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derpRecvCh: make(chan derpReadResult, 1), // must be buffered, see issue 3736
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derpStarted: make(chan struct{}),
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peerLastDerp: make(map[key.NodePublic]int),
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peerMap: newPeerMap(),
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discoInfo: make(map[key.DiscoPublic]*discoInfo),
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discoPrivate: discoPrivate,
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discoPublic: discoPrivate.Public(),
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}
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c.discoShort = c.discoPublic.ShortString()
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c.bind = &connBind{Conn: c, closed: true}
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c.receiveBatchPool = sync.Pool{New: func() any {
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msgs := make([]ipv6.Message, c.bind.BatchSize())
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for i := range msgs {
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msgs[i].Buffers = make([][]byte, 1)
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msgs[i].OOB = make([]byte, controlMessageSize)
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}
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batch := &receiveBatch{
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msgs: msgs,
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}
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return batch
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}}
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c.muCond = sync.NewCond(&c.mu)
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c.networkUp.Store(true) // assume up until told otherwise
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return c
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}
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// NewConn creates a magic Conn listening on opts.Port.
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// As the set of possible endpoints for a Conn changes, the
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// callback opts.EndpointsFunc is called.
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func NewConn(opts Options) (*Conn, error) {
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c := newConn()
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c.port.Store(uint32(opts.Port))
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c.controlKnobs = opts.ControlKnobs
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c.logf = opts.logf()
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c.epFunc = opts.endpointsFunc()
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c.derpActiveFunc = opts.derpActiveFunc()
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c.idleFunc = opts.IdleFunc
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c.testOnlyPacketListener = opts.TestOnlyPacketListener
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c.noteRecvActivity = opts.NoteRecvActivity
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c.portMapper = portmapper.NewClient(logger.WithPrefix(c.logf, "portmapper: "), opts.NetMon, nil, opts.ControlKnobs, c.onPortMapChanged)
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if opts.NetMon != nil {
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c.portMapper.SetGatewayLookupFunc(opts.NetMon.GatewayAndSelfIP)
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}
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c.netMon = opts.NetMon
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if err := c.rebind(keepCurrentPort); err != nil {
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return nil, err
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}
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c.connCtx, c.connCtxCancel = context.WithCancel(context.Background())
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c.donec = c.connCtx.Done()
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c.netChecker = &netcheck.Client{
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Logf: logger.WithPrefix(c.logf, "netcheck: "),
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NetMon: c.netMon,
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SendPacket: func(b []byte, ap netip.AddrPort) (int, error) {
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ok, err := c.sendUDP(ap, b)
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if !ok {
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return 0, err
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}
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return len(b), err
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},
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SkipExternalNetwork: inTest(),
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PortMapper: c.portMapper,
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UseDNSCache: true,
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}
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if d4, err := c.listenRawDisco("ip4"); err == nil {
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c.logf("[v1] using BPF disco receiver for IPv4")
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c.closeDisco4 = d4
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} else {
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c.logf("[v1] couldn't create raw v4 disco listener, using regular listener instead: %v", err)
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}
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if d6, err := c.listenRawDisco("ip6"); err == nil {
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c.logf("[v1] using BPF disco receiver for IPv6")
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c.closeDisco6 = d6
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} else {
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c.logf("[v1] couldn't create raw v6 disco listener, using regular listener instead: %v", err)
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}
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c.logf("magicsock: disco key = %v", c.discoShort)
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return c, nil
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}
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// InstallCaptureHook installs a callback which is called to
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// log debug information into the pcap stream. This function
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// can be called with a nil argument to uninstall the capture
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// hook.
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func (c *Conn) InstallCaptureHook(cb capture.Callback) {
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c.captureHook.Store(cb)
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}
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// doPeriodicSTUN is called (in a new goroutine) by
|
|
// periodicReSTUNTimer when periodic STUNs are active.
|
|
func (c *Conn) doPeriodicSTUN() { c.ReSTUN("periodic") }
|
|
|
|
func (c *Conn) stopPeriodicReSTUNTimerLocked() {
|
|
if t := c.periodicReSTUNTimer; t != nil {
|
|
t.Stop()
|
|
c.periodicReSTUNTimer = nil
|
|
}
|
|
}
|
|
|
|
// c.mu must NOT be held.
|
|
func (c *Conn) updateEndpoints(why string) {
|
|
metricUpdateEndpoints.Add(1)
|
|
defer func() {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
why := c.wantEndpointsUpdate
|
|
c.wantEndpointsUpdate = ""
|
|
if !c.closed {
|
|
if why != "" {
|
|
go c.updateEndpoints(why)
|
|
return
|
|
}
|
|
if c.shouldDoPeriodicReSTUNLocked() {
|
|
// Pick a random duration between 20
|
|
// and 26 seconds (just under 30s, a
|
|
// common UDP NAT timeout on Linux,
|
|
// etc)
|
|
d := tstime.RandomDurationBetween(20*time.Second, 26*time.Second)
|
|
if t := c.periodicReSTUNTimer; t != nil {
|
|
if debugReSTUNStopOnIdle() {
|
|
c.logf("resetting existing periodicSTUN to run in %v", d)
|
|
}
|
|
t.Reset(d)
|
|
} else {
|
|
if debugReSTUNStopOnIdle() {
|
|
c.logf("scheduling periodicSTUN to run in %v", d)
|
|
}
|
|
c.periodicReSTUNTimer = time.AfterFunc(d, c.doPeriodicSTUN)
|
|
}
|
|
} else {
|
|
if debugReSTUNStopOnIdle() {
|
|
c.logf("periodic STUN idle")
|
|
}
|
|
c.stopPeriodicReSTUNTimerLocked()
|
|
}
|
|
}
|
|
c.endpointsUpdateActive = false
|
|
c.muCond.Broadcast()
|
|
}()
|
|
c.dlogf("[v1] magicsock: starting endpoint update (%s)", why)
|
|
if c.noV4Send.Load() && runtime.GOOS != "js" {
|
|
c.mu.Lock()
|
|
closed := c.closed
|
|
c.mu.Unlock()
|
|
if !closed {
|
|
c.logf("magicsock: last netcheck reported send error. Rebinding.")
|
|
c.Rebind()
|
|
}
|
|
}
|
|
|
|
endpoints, err := c.determineEndpoints(c.connCtx)
|
|
if err != nil {
|
|
c.logf("magicsock: endpoint update (%s) failed: %v", why, err)
|
|
// TODO(crawshaw): are there any conditions under which
|
|
// we should trigger a retry based on the error here?
|
|
return
|
|
}
|
|
|
|
if c.setEndpoints(endpoints) {
|
|
c.logEndpointChange(endpoints)
|
|
c.epFunc(endpoints)
|
|
}
|
|
}
|
|
|
|
// setEndpoints records the new endpoints, reporting whether they're changed.
|
|
// It takes ownership of the slice.
|
|
func (c *Conn) setEndpoints(endpoints []tailcfg.Endpoint) (changed bool) {
|
|
anySTUN := false
|
|
for _, ep := range endpoints {
|
|
if ep.Type == tailcfg.EndpointSTUN {
|
|
anySTUN = true
|
|
}
|
|
}
|
|
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
|
|
if !anySTUN && c.derpMap == nil && !inTest() {
|
|
// Don't bother storing or reporting this yet. We
|
|
// don't have a DERP map or any STUN entries, so we're
|
|
// just starting up. A DERP map should arrive shortly
|
|
// and then we'll have more interesting endpoints to
|
|
// report. This saves a map update.
|
|
// TODO(bradfitz): this optimization is currently
|
|
// skipped during the e2e tests because they depend
|
|
// too much on the exact sequence of updates. Fix the
|
|
// tests. But a protocol rewrite might happen first.
|
|
c.dlogf("[v1] magicsock: ignoring pre-DERP map, STUN-less endpoint update: %v", endpoints)
|
|
return false
|
|
}
|
|
|
|
c.lastEndpointsTime = time.Now()
|
|
for de, fn := range c.onEndpointRefreshed {
|
|
go fn()
|
|
delete(c.onEndpointRefreshed, de)
|
|
}
|
|
|
|
if endpointSetsEqual(endpoints, c.lastEndpoints) {
|
|
return false
|
|
}
|
|
c.lastEndpoints = endpoints
|
|
return true
|
|
}
|
|
|
|
// setNetInfoHavePortMap updates NetInfo.HavePortMap to true.
|
|
func (c *Conn) setNetInfoHavePortMap() {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
if c.netInfoLast == nil {
|
|
// No NetInfo yet. Nothing to update.
|
|
return
|
|
}
|
|
if c.netInfoLast.HavePortMap {
|
|
// No change.
|
|
return
|
|
}
|
|
ni := c.netInfoLast.Clone()
|
|
ni.HavePortMap = true
|
|
c.callNetInfoCallbackLocked(ni)
|
|
}
|
|
|
|
func (c *Conn) updateNetInfo(ctx context.Context) (*netcheck.Report, error) {
|
|
c.mu.Lock()
|
|
dm := c.derpMap
|
|
c.mu.Unlock()
|
|
|
|
if dm == nil || c.networkDown() {
|
|
return new(netcheck.Report), nil
|
|
}
|
|
|
|
ctx, cancel := context.WithTimeout(ctx, 2*time.Second)
|
|
defer cancel()
|
|
|
|
report, err := c.netChecker.GetReport(ctx, dm)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
c.lastNetCheckReport.Store(report)
|
|
c.noV4.Store(!report.IPv4)
|
|
c.noV6.Store(!report.IPv6)
|
|
c.noV4Send.Store(!report.IPv4CanSend)
|
|
|
|
ni := &tailcfg.NetInfo{
|
|
DERPLatency: map[string]float64{},
|
|
MappingVariesByDestIP: report.MappingVariesByDestIP,
|
|
HairPinning: report.HairPinning,
|
|
UPnP: report.UPnP,
|
|
PMP: report.PMP,
|
|
PCP: report.PCP,
|
|
HavePortMap: c.portMapper.HaveMapping(),
|
|
}
|
|
for rid, d := range report.RegionV4Latency {
|
|
ni.DERPLatency[fmt.Sprintf("%d-v4", rid)] = d.Seconds()
|
|
}
|
|
for rid, d := range report.RegionV6Latency {
|
|
ni.DERPLatency[fmt.Sprintf("%d-v6", rid)] = d.Seconds()
|
|
}
|
|
ni.WorkingIPv6.Set(report.IPv6)
|
|
ni.OSHasIPv6.Set(report.OSHasIPv6)
|
|
ni.WorkingUDP.Set(report.UDP)
|
|
ni.WorkingICMPv4.Set(report.ICMPv4)
|
|
ni.PreferredDERP = report.PreferredDERP
|
|
preferDERP := debugPreferDERPRegion()
|
|
if preferDERP > 0 {
|
|
ni.PreferredDERP = preferDERP
|
|
}
|
|
|
|
if ni.PreferredDERP == 0 {
|
|
// Perhaps UDP is blocked. Pick a deterministic but arbitrary
|
|
// one.
|
|
ni.PreferredDERP = c.pickDERPFallback()
|
|
}
|
|
if !c.setNearestDERP(ni.PreferredDERP) {
|
|
ni.PreferredDERP = 0
|
|
}
|
|
ni.FirewallMode = hostinfo.FirewallMode()
|
|
|
|
c.callNetInfoCallback(ni)
|
|
return report, nil
|
|
}
|
|
|
|
// callNetInfoCallback calls the callback (if previously
|
|
// registered with SetNetInfoCallback) if ni has substantially changed
|
|
// since the last state.
|
|
//
|
|
// callNetInfoCallback takes ownership of ni.
|
|
//
|
|
// c.mu must NOT be held.
|
|
func (c *Conn) callNetInfoCallback(ni *tailcfg.NetInfo) {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
if ni.BasicallyEqual(c.netInfoLast) {
|
|
return
|
|
}
|
|
c.callNetInfoCallbackLocked(ni)
|
|
}
|
|
|
|
func (c *Conn) callNetInfoCallbackLocked(ni *tailcfg.NetInfo) {
|
|
c.netInfoLast = ni
|
|
if c.netInfoFunc != nil {
|
|
c.dlogf("[v1] magicsock: netInfo update: %+v", ni)
|
|
go c.netInfoFunc(ni)
|
|
}
|
|
}
|
|
|
|
// addValidDiscoPathForTest makes addr a validated disco address for
|
|
// discoKey. It's used in tests to enable receiving of packets from
|
|
// addr without having to spin up the entire active discovery
|
|
// machinery.
|
|
func (c *Conn) addValidDiscoPathForTest(nodeKey key.NodePublic, addr netip.AddrPort) {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
c.peerMap.setNodeKeyForIPPort(addr, nodeKey)
|
|
}
|
|
|
|
// SetNetInfoCallback sets the func to be called whenever the network conditions
|
|
// change.
|
|
//
|
|
// At most one func can be registered; the most recent one replaces any previous
|
|
// registration.
|
|
//
|
|
// This is called by LocalBackend.
|
|
func (c *Conn) SetNetInfoCallback(fn func(*tailcfg.NetInfo)) {
|
|
if fn == nil {
|
|
panic("nil NetInfoCallback")
|
|
}
|
|
c.mu.Lock()
|
|
last := c.netInfoLast
|
|
c.netInfoFunc = fn
|
|
c.mu.Unlock()
|
|
|
|
if last != nil {
|
|
fn(last)
|
|
}
|
|
}
|
|
|
|
// LastRecvActivityOfNodeKey describes the time we last got traffic from
|
|
// this endpoint (updated every ~10 seconds).
|
|
func (c *Conn) LastRecvActivityOfNodeKey(nk key.NodePublic) string {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
de, ok := c.peerMap.endpointForNodeKey(nk)
|
|
if !ok {
|
|
return "never"
|
|
}
|
|
saw := de.lastRecv.LoadAtomic()
|
|
if saw == 0 {
|
|
return "never"
|
|
}
|
|
return mono.Since(saw).Round(time.Second).String()
|
|
}
|
|
|
|
// Ping handles a "tailscale ping" CLI query.
|
|
func (c *Conn) Ping(peer tailcfg.NodeView, res *ipnstate.PingResult, size int, cb func(*ipnstate.PingResult)) {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
if c.privateKey.IsZero() {
|
|
res.Err = "local tailscaled stopped"
|
|
cb(res)
|
|
return
|
|
}
|
|
if peer.Addresses().Len() > 0 {
|
|
res.NodeIP = peer.Addresses().At(0).Addr().String()
|
|
}
|
|
res.NodeName = peer.Name() // prefer DNS name
|
|
if res.NodeName == "" {
|
|
res.NodeName = peer.Hostinfo().Hostname() // else hostname
|
|
} else {
|
|
res.NodeName, _, _ = strings.Cut(res.NodeName, ".")
|
|
}
|
|
|
|
ep, ok := c.peerMap.endpointForNodeKey(peer.Key())
|
|
if !ok {
|
|
res.Err = "unknown peer"
|
|
cb(res)
|
|
return
|
|
}
|
|
ep.discoPing(res, size, cb)
|
|
}
|
|
|
|
// c.mu must be held
|
|
func (c *Conn) populateCLIPingResponseLocked(res *ipnstate.PingResult, latency time.Duration, ep netip.AddrPort) {
|
|
res.LatencySeconds = latency.Seconds()
|
|
if ep.Addr() != tailcfg.DerpMagicIPAddr {
|
|
res.Endpoint = ep.String()
|
|
return
|
|
}
|
|
regionID := int(ep.Port())
|
|
res.DERPRegionID = regionID
|
|
res.DERPRegionCode = c.derpRegionCodeLocked(regionID)
|
|
}
|
|
|
|
// GetEndpointChanges returns the most recent changes for a particular
|
|
// endpoint. The returned EndpointChange structs are for debug use only and
|
|
// there are no guarantees about order, size, or content.
|
|
func (c *Conn) GetEndpointChanges(peer tailcfg.NodeView) ([]EndpointChange, error) {
|
|
c.mu.Lock()
|
|
if c.privateKey.IsZero() {
|
|
c.mu.Unlock()
|
|
return nil, fmt.Errorf("tailscaled stopped")
|
|
}
|
|
ep, ok := c.peerMap.endpointForNodeKey(peer.Key())
|
|
c.mu.Unlock()
|
|
|
|
if !ok {
|
|
return nil, fmt.Errorf("unknown peer")
|
|
}
|
|
|
|
return ep.debugUpdates.GetAll(), nil
|
|
}
|
|
|
|
// DiscoPublicKey returns the discovery public key.
|
|
func (c *Conn) DiscoPublicKey() key.DiscoPublic {
|
|
return c.discoPublic
|
|
}
|
|
|
|
// determineEndpoints returns the machine's endpoint addresses. It
|
|
// does a STUN lookup (via netcheck) to determine its public address.
|
|
//
|
|
// c.mu must NOT be held.
|
|
func (c *Conn) determineEndpoints(ctx context.Context) ([]tailcfg.Endpoint, error) {
|
|
var havePortmap bool
|
|
var portmapExt netip.AddrPort
|
|
if runtime.GOOS != "js" {
|
|
portmapExt, havePortmap = c.portMapper.GetCachedMappingOrStartCreatingOne()
|
|
}
|
|
|
|
nr, err := c.updateNetInfo(ctx)
|
|
if err != nil {
|
|
c.logf("magicsock.Conn.determineEndpoints: updateNetInfo: %v", err)
|
|
return nil, err
|
|
}
|
|
|
|
if runtime.GOOS == "js" {
|
|
// TODO(bradfitz): why does control require an
|
|
// endpoint? Otherwise it doesn't stream map responses
|
|
// back.
|
|
return []tailcfg.Endpoint{
|
|
{
|
|
Addr: netip.MustParseAddrPort("[fe80:123:456:789::1]:12345"),
|
|
Type: tailcfg.EndpointLocal,
|
|
},
|
|
}, nil
|
|
}
|
|
|
|
var already map[netip.AddrPort]tailcfg.EndpointType // endpoint -> how it was found
|
|
var eps []tailcfg.Endpoint // unique endpoints
|
|
|
|
ipp := func(s string) (ipp netip.AddrPort) {
|
|
ipp, _ = netip.ParseAddrPort(s)
|
|
return
|
|
}
|
|
addAddr := func(ipp netip.AddrPort, et tailcfg.EndpointType) {
|
|
if !ipp.IsValid() || (debugOmitLocalAddresses() && et == tailcfg.EndpointLocal) {
|
|
return
|
|
}
|
|
if _, ok := already[ipp]; !ok {
|
|
mak.Set(&already, ipp, et)
|
|
eps = append(eps, tailcfg.Endpoint{Addr: ipp, Type: et})
|
|
}
|
|
}
|
|
|
|
// If we didn't have a portmap earlier, maybe it's done by now.
|
|
if !havePortmap {
|
|
portmapExt, havePortmap = c.portMapper.GetCachedMappingOrStartCreatingOne()
|
|
}
|
|
if havePortmap {
|
|
addAddr(portmapExt, tailcfg.EndpointPortmapped)
|
|
c.setNetInfoHavePortMap()
|
|
}
|
|
|
|
if nr.GlobalV4 != "" {
|
|
addAddr(ipp(nr.GlobalV4), tailcfg.EndpointSTUN)
|
|
|
|
// If they're behind a hard NAT and are using a fixed
|
|
// port locally, assume they might've added a static
|
|
// port mapping on their router to the same explicit
|
|
// port that tailscaled is running with. Worst case
|
|
// it's an invalid candidate mapping.
|
|
if port := c.port.Load(); nr.MappingVariesByDestIP.EqualBool(true) && port != 0 {
|
|
if ip, _, err := net.SplitHostPort(nr.GlobalV4); err == nil {
|
|
addAddr(ipp(net.JoinHostPort(ip, strconv.Itoa(int(port)))), tailcfg.EndpointSTUN4LocalPort)
|
|
}
|
|
}
|
|
}
|
|
if nr.GlobalV6 != "" {
|
|
addAddr(ipp(nr.GlobalV6), tailcfg.EndpointSTUN)
|
|
}
|
|
|
|
// Update our set of endpoints by adding any endpoints that we
|
|
// previously found but haven't expired yet. This also updates the
|
|
// cache with the set of endpoints discovered in this function.
|
|
//
|
|
// NOTE: we do this here and not below so that we don't cache local
|
|
// endpoints; we know that the local endpoints we discover are all
|
|
// possible local endpoints since we determine them by looking at the
|
|
// set of addresses on our local interfaces.
|
|
//
|
|
// TODO(andrew): If we pull in any cached endpoints, we should probably
|
|
// do something to ensure we're propagating the removal of those cached
|
|
// endpoints if they do actually time out without being rediscovered.
|
|
// For now, though, rely on a minor LinkChange event causing this to
|
|
// re-run.
|
|
eps = c.endpointTracker.update(time.Now(), eps)
|
|
|
|
if localAddr := c.pconn4.LocalAddr(); localAddr.IP.IsUnspecified() {
|
|
ips, loopback, err := interfaces.LocalAddresses()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(ips) == 0 && len(eps) == 0 {
|
|
// Only include loopback addresses if we have no
|
|
// interfaces at all to use as endpoints and don't
|
|
// have a public IPv4 or IPv6 address. This allows
|
|
// for localhost testing when you're on a plane and
|
|
// offline, for example.
|
|
ips = loopback
|
|
}
|
|
for _, ip := range ips {
|
|
addAddr(netip.AddrPortFrom(ip, uint16(localAddr.Port)), tailcfg.EndpointLocal)
|
|
}
|
|
} else {
|
|
// Our local endpoint is bound to a particular address.
|
|
// Do not offer addresses on other local interfaces.
|
|
addAddr(ipp(localAddr.String()), tailcfg.EndpointLocal)
|
|
}
|
|
|
|
// Note: the endpoints are intentionally returned in priority order,
|
|
// from "farthest but most reliable" to "closest but least
|
|
// reliable." Addresses returned from STUN should be globally
|
|
// addressable, but might go farther on the network than necessary.
|
|
// Local interface addresses might have lower latency, but not be
|
|
// globally addressable.
|
|
//
|
|
// The STUN address(es) are always first so that legacy wireguard
|
|
// can use eps[0] as its only known endpoint address (although that's
|
|
// obviously non-ideal).
|
|
//
|
|
// Despite this sorting, though, clients since 0.100 haven't relied
|
|
// on the sorting order for any decisions.
|
|
return eps, nil
|
|
}
|
|
|
|
// endpointSetsEqual reports whether x and y represent the same set of
|
|
// endpoints. The order doesn't matter.
|
|
//
|
|
// It does not mutate the slices.
|
|
func endpointSetsEqual(x, y []tailcfg.Endpoint) bool {
|
|
if len(x) == len(y) {
|
|
orderMatches := true
|
|
for i := range x {
|
|
if x[i] != y[i] {
|
|
orderMatches = false
|
|
break
|
|
}
|
|
}
|
|
if orderMatches {
|
|
return true
|
|
}
|
|
}
|
|
m := map[tailcfg.Endpoint]int{}
|
|
for _, v := range x {
|
|
m[v] |= 1
|
|
}
|
|
for _, v := range y {
|
|
m[v] |= 2
|
|
}
|
|
for _, n := range m {
|
|
if n != 3 {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// LocalPort returns the current IPv4 listener's port number.
|
|
func (c *Conn) LocalPort() uint16 {
|
|
if runtime.GOOS == "js" {
|
|
return 12345
|
|
}
|
|
laddr := c.pconn4.LocalAddr()
|
|
return uint16(laddr.Port)
|
|
}
|
|
|
|
var errNetworkDown = errors.New("magicsock: network down")
|
|
|
|
func (c *Conn) networkDown() bool { return !c.networkUp.Load() }
|
|
|
|
// Send implements conn.Bind.
|
|
//
|
|
// See https://pkg.go.dev/golang.zx2c4.com/wireguard/conn#Bind.Send
|
|
func (c *Conn) Send(buffs [][]byte, ep conn.Endpoint) error {
|
|
n := int64(len(buffs))
|
|
metricSendData.Add(n)
|
|
if c.networkDown() {
|
|
metricSendDataNetworkDown.Add(n)
|
|
return errNetworkDown
|
|
}
|
|
return ep.(*endpoint).send(buffs)
|
|
}
|
|
|
|
var errConnClosed = errors.New("Conn closed")
|
|
|
|
var errDropDerpPacket = errors.New("too many DERP packets queued; dropping")
|
|
|
|
var errNoUDP = errors.New("no UDP available on platform")
|
|
|
|
var errUnsupportedConnType = errors.New("unsupported connection type")
|
|
|
|
var (
|
|
// This acts as a compile-time check for our usage of ipv6.Message in
|
|
// batchingUDPConn for both IPv6 and IPv4 operations.
|
|
_ ipv6.Message = ipv4.Message{}
|
|
)
|
|
|
|
func (c *Conn) sendUDPBatch(addr netip.AddrPort, buffs [][]byte) (sent bool, err error) {
|
|
isIPv6 := false
|
|
switch {
|
|
case addr.Addr().Is4():
|
|
case addr.Addr().Is6():
|
|
isIPv6 = true
|
|
default:
|
|
panic("bogus sendUDPBatch addr type")
|
|
}
|
|
if isIPv6 {
|
|
err = c.pconn6.WriteBatchTo(buffs, addr)
|
|
} else {
|
|
err = c.pconn4.WriteBatchTo(buffs, addr)
|
|
}
|
|
if err != nil {
|
|
var errGSO neterror.ErrUDPGSODisabled
|
|
if errors.As(err, &errGSO) {
|
|
c.logf("magicsock: %s", errGSO.Error())
|
|
err = errGSO.RetryErr
|
|
}
|
|
}
|
|
return err == nil, err
|
|
}
|
|
|
|
// sendUDP sends UDP packet b to ipp.
|
|
// See sendAddr's docs on the return value meanings.
|
|
func (c *Conn) sendUDP(ipp netip.AddrPort, b []byte) (sent bool, err error) {
|
|
if runtime.GOOS == "js" {
|
|
return false, errNoUDP
|
|
}
|
|
sent, err = c.sendUDPStd(ipp, b)
|
|
if err != nil {
|
|
metricSendUDPError.Add(1)
|
|
} else {
|
|
if sent {
|
|
metricSendUDP.Add(1)
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
// sendUDP sends UDP packet b to addr.
|
|
// See sendAddr's docs on the return value meanings.
|
|
func (c *Conn) sendUDPStd(addr netip.AddrPort, b []byte) (sent bool, err error) {
|
|
switch {
|
|
case addr.Addr().Is4():
|
|
_, err = c.pconn4.WriteToUDPAddrPort(b, addr)
|
|
if err != nil && (c.noV4.Load() || neterror.TreatAsLostUDP(err)) {
|
|
return false, nil
|
|
}
|
|
case addr.Addr().Is6():
|
|
_, err = c.pconn6.WriteToUDPAddrPort(b, addr)
|
|
if err != nil && (c.noV6.Load() || neterror.TreatAsLostUDP(err)) {
|
|
return false, nil
|
|
}
|
|
default:
|
|
panic("bogus sendUDPStd addr type")
|
|
}
|
|
return err == nil, err
|
|
}
|
|
|
|
// sendAddr sends packet b to addr, which is either a real UDP address
|
|
// or a fake UDP address representing a DERP server (see derpmap.go).
|
|
// The provided public key identifies the recipient.
|
|
//
|
|
// The returned err is whether there was an error writing when it
|
|
// should've worked.
|
|
// The returned sent is whether a packet went out at all.
|
|
// An example of when they might be different: sending to an
|
|
// IPv6 address when the local machine doesn't have IPv6 support
|
|
// returns (false, nil); it's not an error, but nothing was sent.
|
|
func (c *Conn) sendAddr(addr netip.AddrPort, pubKey key.NodePublic, b []byte) (sent bool, err error) {
|
|
if addr.Addr() != tailcfg.DerpMagicIPAddr {
|
|
return c.sendUDP(addr, b)
|
|
}
|
|
|
|
ch := c.derpWriteChanOfAddr(addr, pubKey)
|
|
if ch == nil {
|
|
metricSendDERPErrorChan.Add(1)
|
|
return false, nil
|
|
}
|
|
|
|
// TODO(bradfitz): this makes garbage for now; we could use a
|
|
// buffer pool later. Previously we passed ownership of this
|
|
// to derpWriteRequest and waited for derphttp.Client.Send to
|
|
// complete, but that's too slow while holding wireguard-go
|
|
// internal locks.
|
|
pkt := make([]byte, len(b))
|
|
copy(pkt, b)
|
|
|
|
select {
|
|
case <-c.donec:
|
|
metricSendDERPErrorClosed.Add(1)
|
|
return false, errConnClosed
|
|
case ch <- derpWriteRequest{addr, pubKey, pkt}:
|
|
metricSendDERPQueued.Add(1)
|
|
return true, nil
|
|
default:
|
|
metricSendDERPErrorQueue.Add(1)
|
|
// Too many writes queued. Drop packet.
|
|
return false, errDropDerpPacket
|
|
}
|
|
}
|
|
|
|
type receiveBatch struct {
|
|
msgs []ipv6.Message
|
|
}
|
|
|
|
func (c *Conn) getReceiveBatchForBuffs(buffs [][]byte) *receiveBatch {
|
|
batch := c.receiveBatchPool.Get().(*receiveBatch)
|
|
for i := range buffs {
|
|
batch.msgs[i].Buffers[0] = buffs[i]
|
|
batch.msgs[i].OOB = batch.msgs[i].OOB[:cap(batch.msgs[i].OOB)]
|
|
}
|
|
return batch
|
|
}
|
|
|
|
func (c *Conn) putReceiveBatch(batch *receiveBatch) {
|
|
for i := range batch.msgs {
|
|
batch.msgs[i] = ipv6.Message{Buffers: batch.msgs[i].Buffers, OOB: batch.msgs[i].OOB}
|
|
}
|
|
c.receiveBatchPool.Put(batch)
|
|
}
|
|
|
|
// receiveIPv4 creates an IPv4 ReceiveFunc reading from c.pconn4.
|
|
func (c *Conn) receiveIPv4() conn.ReceiveFunc {
|
|
return c.mkReceiveFunc(&c.pconn4, &health.ReceiveIPv4, metricRecvDataIPv4)
|
|
}
|
|
|
|
// receiveIPv6 creates an IPv6 ReceiveFunc reading from c.pconn6.
|
|
func (c *Conn) receiveIPv6() conn.ReceiveFunc {
|
|
return c.mkReceiveFunc(&c.pconn6, &health.ReceiveIPv6, metricRecvDataIPv6)
|
|
}
|
|
|
|
// mkReceiveFunc creates a ReceiveFunc reading from ruc.
|
|
// The provided healthItem and metric are updated if non-nil.
|
|
func (c *Conn) mkReceiveFunc(ruc *RebindingUDPConn, healthItem *health.ReceiveFuncStats, metric *clientmetric.Metric) conn.ReceiveFunc {
|
|
// epCache caches an IPPort->endpoint for hot flows.
|
|
var epCache ippEndpointCache
|
|
|
|
return func(buffs [][]byte, sizes []int, eps []conn.Endpoint) (int, error) {
|
|
if healthItem != nil {
|
|
healthItem.Enter()
|
|
defer healthItem.Exit()
|
|
}
|
|
if ruc == nil {
|
|
panic("nil RebindingUDPConn")
|
|
}
|
|
|
|
batch := c.getReceiveBatchForBuffs(buffs)
|
|
defer c.putReceiveBatch(batch)
|
|
for {
|
|
numMsgs, err := ruc.ReadBatch(batch.msgs[:len(buffs)], 0)
|
|
if err != nil {
|
|
if neterror.PacketWasTruncated(err) {
|
|
continue
|
|
}
|
|
return 0, err
|
|
}
|
|
|
|
reportToCaller := false
|
|
for i, msg := range batch.msgs[:numMsgs] {
|
|
if msg.N == 0 {
|
|
sizes[i] = 0
|
|
continue
|
|
}
|
|
ipp := msg.Addr.(*net.UDPAddr).AddrPort()
|
|
if ep, ok := c.receiveIP(msg.Buffers[0][:msg.N], ipp, &epCache); ok {
|
|
if metric != nil {
|
|
metric.Add(1)
|
|
}
|
|
eps[i] = ep
|
|
sizes[i] = msg.N
|
|
reportToCaller = true
|
|
} else {
|
|
sizes[i] = 0
|
|
}
|
|
}
|
|
if reportToCaller {
|
|
return numMsgs, nil
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// receiveIP is the shared bits of ReceiveIPv4 and ReceiveIPv6.
|
|
//
|
|
// ok is whether this read should be reported up to wireguard-go (our
|
|
// caller).
|
|
func (c *Conn) receiveIP(b []byte, ipp netip.AddrPort, cache *ippEndpointCache) (ep *endpoint, ok bool) {
|
|
if stun.Is(b) {
|
|
c.netChecker.ReceiveSTUNPacket(b, ipp)
|
|
return nil, false
|
|
}
|
|
if c.handleDiscoMessage(b, ipp, key.NodePublic{}, discoRXPathUDP) {
|
|
return nil, false
|
|
}
|
|
if !c.havePrivateKey.Load() {
|
|
// If we have no private key, we're logged out or
|
|
// stopped. Don't try to pass these wireguard packets
|
|
// up to wireguard-go; it'll just complain (issue 1167).
|
|
return nil, false
|
|
}
|
|
if cache.ipp == ipp && cache.de != nil && cache.gen == cache.de.numStopAndReset() {
|
|
ep = cache.de
|
|
} else {
|
|
c.mu.Lock()
|
|
de, ok := c.peerMap.endpointForIPPort(ipp)
|
|
c.mu.Unlock()
|
|
if !ok {
|
|
return nil, false
|
|
}
|
|
cache.ipp = ipp
|
|
cache.de = de
|
|
cache.gen = de.numStopAndReset()
|
|
ep = de
|
|
}
|
|
ep.noteRecvActivity(ipp)
|
|
if stats := c.stats.Load(); stats != nil {
|
|
stats.UpdateRxPhysical(ep.nodeAddr, ipp, len(b))
|
|
}
|
|
return ep, true
|
|
}
|
|
|
|
// discoLogLevel controls the verbosity of discovery log messages.
|
|
type discoLogLevel int
|
|
|
|
const (
|
|
// discoLog means that a message should be logged.
|
|
discoLog discoLogLevel = iota
|
|
|
|
// discoVerboseLog means that a message should only be logged
|
|
// in TS_DEBUG_DISCO mode.
|
|
discoVerboseLog
|
|
)
|
|
|
|
// TS_DISCO_PONG_IPV4_DELAY, if set, is a time.Duration string that is how much
|
|
// fake latency to add before replying to disco pings. This can be used to bias
|
|
// peers towards using IPv6 when both IPv4 and IPv6 are available at similar
|
|
// speeds.
|
|
var debugIPv4DiscoPingPenalty = envknob.RegisterDuration("TS_DISCO_PONG_IPV4_DELAY")
|
|
|
|
// sendDiscoMessage sends discovery message m to dstDisco at dst.
|
|
//
|
|
// If dst is a DERP IP:port, then dstKey must be non-zero.
|
|
//
|
|
// The dstKey should only be non-zero if the dstDisco key
|
|
// unambiguously maps to exactly one peer.
|
|
func (c *Conn) sendDiscoMessage(dst netip.AddrPort, dstKey key.NodePublic, dstDisco key.DiscoPublic, m disco.Message, logLevel discoLogLevel) (sent bool, err error) {
|
|
isDERP := dst.Addr() == tailcfg.DerpMagicIPAddr
|
|
if _, isPong := m.(*disco.Pong); isPong && !isDERP && dst.Addr().Is4() {
|
|
time.Sleep(debugIPv4DiscoPingPenalty())
|
|
}
|
|
|
|
c.mu.Lock()
|
|
if c.closed {
|
|
c.mu.Unlock()
|
|
return false, errConnClosed
|
|
}
|
|
pkt := make([]byte, 0, 512) // TODO: size it correctly? pool? if it matters.
|
|
pkt = append(pkt, disco.Magic...)
|
|
pkt = c.discoPublic.AppendTo(pkt)
|
|
di := c.discoInfoLocked(dstDisco)
|
|
c.mu.Unlock()
|
|
|
|
if isDERP {
|
|
metricSendDiscoDERP.Add(1)
|
|
} else {
|
|
metricSendDiscoUDP.Add(1)
|
|
}
|
|
|
|
box := di.sharedKey.Seal(m.AppendMarshal(nil))
|
|
pkt = append(pkt, box...)
|
|
sent, err = c.sendAddr(dst, dstKey, pkt)
|
|
if sent {
|
|
if logLevel == discoLog || (logLevel == discoVerboseLog && debugDisco()) {
|
|
node := "?"
|
|
if !dstKey.IsZero() {
|
|
node = dstKey.ShortString()
|
|
}
|
|
c.dlogf("[v1] magicsock: disco: %v->%v (%v, %v) sent %v len %v\n", c.discoShort, dstDisco.ShortString(), node, derpStr(dst.String()), disco.MessageSummary(m), len(pkt))
|
|
}
|
|
if isDERP {
|
|
metricSentDiscoDERP.Add(1)
|
|
} else {
|
|
metricSentDiscoUDP.Add(1)
|
|
}
|
|
switch m.(type) {
|
|
case *disco.Ping:
|
|
metricSentDiscoPing.Add(1)
|
|
case *disco.Pong:
|
|
metricSentDiscoPong.Add(1)
|
|
case *disco.CallMeMaybe:
|
|
metricSentDiscoCallMeMaybe.Add(1)
|
|
}
|
|
} else if err == nil {
|
|
// Can't send. (e.g. no IPv6 locally)
|
|
} else {
|
|
if !c.networkDown() {
|
|
c.logf("magicsock: disco: failed to send %v to %v: %v", disco.MessageSummary(m), dst, err)
|
|
}
|
|
}
|
|
return sent, err
|
|
}
|
|
|
|
type discoRXPath string
|
|
|
|
const (
|
|
discoRXPathUDP discoRXPath = "UDP socket"
|
|
discoRXPathDERP discoRXPath = "DERP"
|
|
discoRXPathRawSocket discoRXPath = "raw socket"
|
|
)
|
|
|
|
// handleDiscoMessage handles a discovery message and reports whether
|
|
// msg was a Tailscale inter-node discovery message.
|
|
//
|
|
// A discovery message has the form:
|
|
//
|
|
// - magic [6]byte
|
|
// - senderDiscoPubKey [32]byte
|
|
// - nonce [24]byte
|
|
// - naclbox of payload (see tailscale.com/disco package for inner payload format)
|
|
//
|
|
// For messages received over DERP, the src.Addr() will be derpMagicIP (with
|
|
// src.Port() being the region ID) and the derpNodeSrc will be the node key
|
|
// it was received from at the DERP layer. derpNodeSrc is zero when received
|
|
// over UDP.
|
|
func (c *Conn) handleDiscoMessage(msg []byte, src netip.AddrPort, derpNodeSrc key.NodePublic, via discoRXPath) (isDiscoMsg bool) {
|
|
const headerLen = len(disco.Magic) + key.DiscoPublicRawLen
|
|
if len(msg) < headerLen || string(msg[:len(disco.Magic)]) != disco.Magic {
|
|
return false
|
|
}
|
|
|
|
// If the first four parts are the prefix of disco.Magic
|
|
// (0x5453f09f) then it's definitely not a valid WireGuard
|
|
// packet (which starts with little-endian uint32 1, 2, 3, 4).
|
|
// Use naked returns for all following paths.
|
|
isDiscoMsg = true
|
|
|
|
sender := key.DiscoPublicFromRaw32(mem.B(msg[len(disco.Magic):headerLen]))
|
|
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
|
|
if c.closed {
|
|
return
|
|
}
|
|
if debugDisco() {
|
|
c.logf("magicsock: disco: got disco-looking frame from %v via %s len %v", sender.ShortString(), via, len(msg))
|
|
}
|
|
if c.privateKey.IsZero() {
|
|
// Ignore disco messages when we're stopped.
|
|
// Still return true, to not pass it down to wireguard.
|
|
return
|
|
}
|
|
|
|
if !c.peerMap.anyEndpointForDiscoKey(sender) {
|
|
metricRecvDiscoBadPeer.Add(1)
|
|
if debugDisco() {
|
|
c.logf("magicsock: disco: ignoring disco-looking frame, don't know endpoint for %v", sender.ShortString())
|
|
}
|
|
return
|
|
}
|
|
|
|
// We're now reasonably sure we're expecting communication from
|
|
// this peer, do the heavy crypto lifting to see what they want.
|
|
//
|
|
// From here on, peerNode and de are non-nil.
|
|
|
|
di := c.discoInfoLocked(sender)
|
|
|
|
sealedBox := msg[headerLen:]
|
|
payload, ok := di.sharedKey.Open(sealedBox)
|
|
if !ok {
|
|
// This might be have been intended for a previous
|
|
// disco key. When we restart we get a new disco key
|
|
// and old packets might've still been in flight (or
|
|
// scheduled). This is particularly the case for LANs
|
|
// or non-NATed endpoints. UDP offloading on Linux
|
|
// can also cause this when a disco message is
|
|
// received via raw socket at the head of a coalesced
|
|
// group of messages. Don't log in normal case.
|
|
// Callers may choose to pass on to wireguard, in case
|
|
// it's actually a wireguard packet (super unlikely, but).
|
|
if debugDisco() {
|
|
c.logf("magicsock: disco: failed to open naclbox from %v (wrong rcpt?) via %s", sender, via)
|
|
}
|
|
metricRecvDiscoBadKey.Add(1)
|
|
return
|
|
}
|
|
|
|
// Emit information about the disco frame into the pcap stream
|
|
// if a capture hook is installed.
|
|
if cb := c.captureHook.Load(); cb != nil {
|
|
cb(capture.PathDisco, time.Now(), disco.ToPCAPFrame(src, derpNodeSrc, payload), packet.CaptureMeta{})
|
|
}
|
|
|
|
dm, err := disco.Parse(payload)
|
|
if debugDisco() {
|
|
c.logf("magicsock: disco: disco.Parse = %T, %v", dm, err)
|
|
}
|
|
if err != nil {
|
|
// Couldn't parse it, but it was inside a correctly
|
|
// signed box, so just ignore it, assuming it's from a
|
|
// newer version of Tailscale that we don't
|
|
// understand. Not even worth logging about, lest it
|
|
// be too spammy for old clients.
|
|
metricRecvDiscoBadParse.Add(1)
|
|
return
|
|
}
|
|
|
|
isDERP := src.Addr() == tailcfg.DerpMagicIPAddr
|
|
if isDERP {
|
|
metricRecvDiscoDERP.Add(1)
|
|
} else {
|
|
metricRecvDiscoUDP.Add(1)
|
|
}
|
|
|
|
switch dm := dm.(type) {
|
|
case *disco.Ping:
|
|
metricRecvDiscoPing.Add(1)
|
|
c.handlePingLocked(dm, src, di, derpNodeSrc)
|
|
case *disco.Pong:
|
|
metricRecvDiscoPong.Add(1)
|
|
// There might be multiple nodes for the sender's DiscoKey.
|
|
// Ask each to handle it, stopping once one reports that
|
|
// the Pong's TxID was theirs.
|
|
c.peerMap.forEachEndpointWithDiscoKey(sender, func(ep *endpoint) (keepGoing bool) {
|
|
if ep.handlePongConnLocked(dm, di, src) {
|
|
return false
|
|
}
|
|
return true
|
|
})
|
|
case *disco.CallMeMaybe:
|
|
metricRecvDiscoCallMeMaybe.Add(1)
|
|
if !isDERP || derpNodeSrc.IsZero() {
|
|
// CallMeMaybe messages should only come via DERP.
|
|
c.logf("[unexpected] CallMeMaybe packets should only come via DERP")
|
|
return
|
|
}
|
|
nodeKey := derpNodeSrc
|
|
ep, ok := c.peerMap.endpointForNodeKey(nodeKey)
|
|
if !ok {
|
|
metricRecvDiscoCallMeMaybeBadNode.Add(1)
|
|
c.logf("magicsock: disco: ignoring CallMeMaybe from %v; %v is unknown", sender.ShortString(), derpNodeSrc.ShortString())
|
|
return
|
|
}
|
|
epDisco := ep.disco.Load()
|
|
if epDisco == nil {
|
|
return
|
|
}
|
|
if epDisco.key != di.discoKey {
|
|
metricRecvDiscoCallMeMaybeBadDisco.Add(1)
|
|
c.logf("[unexpected] CallMeMaybe from peer via DERP whose netmap discokey != disco source")
|
|
return
|
|
}
|
|
c.dlogf("[v1] magicsock: disco: %v<-%v (%v, %v) got call-me-maybe, %d endpoints",
|
|
c.discoShort, epDisco.short,
|
|
ep.publicKey.ShortString(), derpStr(src.String()),
|
|
len(dm.MyNumber))
|
|
go ep.handleCallMeMaybe(dm)
|
|
}
|
|
return
|
|
}
|
|
|
|
// unambiguousNodeKeyOfPingLocked attempts to look up an unambiguous mapping
|
|
// from a DiscoKey dk (which sent ping dm) to a NodeKey. ok is true
|
|
// if there's the NodeKey is known unambiguously.
|
|
//
|
|
// derpNodeSrc is non-zero if the disco ping arrived via DERP.
|
|
//
|
|
// c.mu must be held.
|
|
func (c *Conn) unambiguousNodeKeyOfPingLocked(dm *disco.Ping, dk key.DiscoPublic, derpNodeSrc key.NodePublic) (nk key.NodePublic, ok bool) {
|
|
if !derpNodeSrc.IsZero() {
|
|
if ep, ok := c.peerMap.endpointForNodeKey(derpNodeSrc); ok {
|
|
epDisco := ep.disco.Load()
|
|
if epDisco != nil && epDisco.key == dk {
|
|
return derpNodeSrc, true
|
|
}
|
|
}
|
|
}
|
|
|
|
// Pings after 1.16.0 contains its node source. See if it maps back.
|
|
if !dm.NodeKey.IsZero() {
|
|
if ep, ok := c.peerMap.endpointForNodeKey(dm.NodeKey); ok {
|
|
epDisco := ep.disco.Load()
|
|
if epDisco != nil && epDisco.key == dk {
|
|
return dm.NodeKey, true
|
|
}
|
|
}
|
|
}
|
|
|
|
// If there's exactly 1 node in our netmap with DiscoKey dk,
|
|
// then it's not ambiguous which node key dm was from.
|
|
if set := c.peerMap.nodesOfDisco[dk]; len(set) == 1 {
|
|
for nk = range set {
|
|
return nk, true
|
|
}
|
|
}
|
|
|
|
return nk, false
|
|
}
|
|
|
|
// di is the discoInfo of the source of the ping.
|
|
// derpNodeSrc is non-zero if the ping arrived via DERP.
|
|
func (c *Conn) handlePingLocked(dm *disco.Ping, src netip.AddrPort, di *discoInfo, derpNodeSrc key.NodePublic) {
|
|
likelyHeartBeat := src == di.lastPingFrom && time.Since(di.lastPingTime) < 5*time.Second
|
|
di.lastPingFrom = src
|
|
di.lastPingTime = time.Now()
|
|
isDerp := src.Addr() == tailcfg.DerpMagicIPAddr
|
|
|
|
// If we can figure out with certainty which node key this disco
|
|
// message is for, eagerly update our IP<>node and disco<>node
|
|
// mappings to make p2p path discovery faster in simple
|
|
// cases. Without this, disco would still work, but would be
|
|
// reliant on DERP call-me-maybe to establish the disco<>node
|
|
// mapping, and on subsequent disco handlePongConnLocked to establish
|
|
// the IP<>disco mapping.
|
|
if nk, ok := c.unambiguousNodeKeyOfPingLocked(dm, di.discoKey, derpNodeSrc); ok {
|
|
if !isDerp {
|
|
c.peerMap.setNodeKeyForIPPort(src, nk)
|
|
}
|
|
}
|
|
|
|
// If we got a ping over DERP, then derpNodeSrc is non-zero and we reply
|
|
// over DERP (in which case ipDst is also a DERP address).
|
|
// But if the ping was over UDP (ipDst is not a DERP address), then dstKey
|
|
// will be zero here, but that's fine: sendDiscoMessage only requires
|
|
// a dstKey if the dst ip:port is DERP.
|
|
dstKey := derpNodeSrc
|
|
|
|
// Remember this route if not present.
|
|
var numNodes int
|
|
var dup bool
|
|
if isDerp {
|
|
if ep, ok := c.peerMap.endpointForNodeKey(derpNodeSrc); ok {
|
|
if ep.addCandidateEndpoint(src, dm.TxID) {
|
|
return
|
|
}
|
|
numNodes = 1
|
|
}
|
|
} else {
|
|
c.peerMap.forEachEndpointWithDiscoKey(di.discoKey, func(ep *endpoint) (keepGoing bool) {
|
|
if ep.addCandidateEndpoint(src, dm.TxID) {
|
|
dup = true
|
|
return false
|
|
}
|
|
numNodes++
|
|
if numNodes == 1 && dstKey.IsZero() {
|
|
dstKey = ep.publicKey
|
|
}
|
|
return true
|
|
})
|
|
if dup {
|
|
return
|
|
}
|
|
if numNodes > 1 {
|
|
// Zero it out if it's ambiguous, so sendDiscoMessage logging
|
|
// isn't confusing.
|
|
dstKey = key.NodePublic{}
|
|
}
|
|
}
|
|
|
|
if numNodes == 0 {
|
|
c.logf("[unexpected] got disco ping from %v/%v for node not in peers", src, derpNodeSrc)
|
|
return
|
|
}
|
|
|
|
if !likelyHeartBeat || debugDisco() {
|
|
pingNodeSrcStr := dstKey.ShortString()
|
|
if numNodes > 1 {
|
|
pingNodeSrcStr = "[one-of-multi]"
|
|
}
|
|
c.dlogf("[v1] magicsock: disco: %v<-%v (%v, %v) got ping tx=%x padding=%v", c.discoShort, di.discoShort, pingNodeSrcStr, src, dm.TxID[:6], dm.Padding)
|
|
}
|
|
|
|
ipDst := src
|
|
discoDest := di.discoKey
|
|
go c.sendDiscoMessage(ipDst, dstKey, discoDest, &disco.Pong{
|
|
TxID: dm.TxID,
|
|
Src: src,
|
|
}, discoVerboseLog)
|
|
}
|
|
|
|
// enqueueCallMeMaybe schedules a send of disco.CallMeMaybe to de via derpAddr
|
|
// once we know that our STUN endpoint is fresh.
|
|
//
|
|
// derpAddr is de.derpAddr at the time of send. It's assumed the peer won't be
|
|
// flipping primary DERPs in the 0-30ms it takes to confirm our STUN endpoint.
|
|
// If they do, traffic will just go over DERP for a bit longer until the next
|
|
// discovery round.
|
|
func (c *Conn) enqueueCallMeMaybe(derpAddr netip.AddrPort, de *endpoint) {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
|
|
epDisco := de.disco.Load()
|
|
if epDisco == nil {
|
|
return
|
|
}
|
|
|
|
if !c.lastEndpointsTime.After(time.Now().Add(-endpointsFreshEnoughDuration)) {
|
|
c.dlogf("[v1] magicsock: want call-me-maybe but endpoints stale; restunning")
|
|
|
|
mak.Set(&c.onEndpointRefreshed, de, func() {
|
|
c.dlogf("[v1] magicsock: STUN done; sending call-me-maybe to %v %v", epDisco.short, de.publicKey.ShortString())
|
|
c.enqueueCallMeMaybe(derpAddr, de)
|
|
})
|
|
// TODO(bradfitz): make a new 'reSTUNQuickly' method
|
|
// that passes down a do-a-lite-netcheck flag down to
|
|
// netcheck that does 1 (or 2 max) STUN queries
|
|
// (UDP-only, not HTTPs) to find our port mapping to
|
|
// our home DERP and maybe one other. For now we do a
|
|
// "full" ReSTUN which may or may not be a full one
|
|
// (depending on age) and may do HTTPS timing queries
|
|
// (if UDP is blocked). Good enough for now.
|
|
go c.ReSTUN("refresh-for-peering")
|
|
return
|
|
}
|
|
|
|
eps := make([]netip.AddrPort, 0, len(c.lastEndpoints))
|
|
for _, ep := range c.lastEndpoints {
|
|
eps = append(eps, ep.Addr)
|
|
}
|
|
go de.c.sendDiscoMessage(derpAddr, de.publicKey, epDisco.key, &disco.CallMeMaybe{MyNumber: eps}, discoLog)
|
|
if debugSendCallMeUnknownPeer() {
|
|
// Send a callMeMaybe packet to a non-existent peer
|
|
unknownKey := key.NewNode().Public()
|
|
c.logf("magicsock: sending CallMeMaybe to unknown peer per TS_DEBUG_SEND_CALLME_UNKNOWN_PEER")
|
|
go de.c.sendDiscoMessage(derpAddr, unknownKey, epDisco.key, &disco.CallMeMaybe{MyNumber: eps}, discoLog)
|
|
}
|
|
}
|
|
|
|
// discoInfoLocked returns the previous or new discoInfo for k.
|
|
//
|
|
// c.mu must be held.
|
|
func (c *Conn) discoInfoLocked(k key.DiscoPublic) *discoInfo {
|
|
di, ok := c.discoInfo[k]
|
|
if !ok {
|
|
di = &discoInfo{
|
|
discoKey: k,
|
|
discoShort: k.ShortString(),
|
|
sharedKey: c.discoPrivate.Shared(k),
|
|
}
|
|
c.discoInfo[k] = di
|
|
}
|
|
return di
|
|
}
|
|
|
|
func (c *Conn) SetNetworkUp(up bool) {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
if c.networkUp.Load() == up {
|
|
return
|
|
}
|
|
|
|
c.logf("magicsock: SetNetworkUp(%v)", up)
|
|
c.networkUp.Store(up)
|
|
|
|
if up {
|
|
c.startDerpHomeConnectLocked()
|
|
} else {
|
|
c.portMapper.NoteNetworkDown()
|
|
c.closeAllDerpLocked("network-down")
|
|
}
|
|
}
|
|
|
|
// SetPreferredPort sets the connection's preferred local port.
|
|
func (c *Conn) SetPreferredPort(port uint16) {
|
|
if uint16(c.port.Load()) == port {
|
|
return
|
|
}
|
|
c.port.Store(uint32(port))
|
|
|
|
if err := c.rebind(dropCurrentPort); err != nil {
|
|
c.logf("%v", err)
|
|
return
|
|
}
|
|
c.resetEndpointStates()
|
|
}
|
|
|
|
// SetPrivateKey sets the connection's private key.
|
|
//
|
|
// This is only used to be able prove our identity when connecting to
|
|
// DERP servers.
|
|
//
|
|
// If the private key changes, any DERP connections are torn down &
|
|
// recreated when needed.
|
|
func (c *Conn) SetPrivateKey(privateKey key.NodePrivate) error {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
|
|
oldKey, newKey := c.privateKey, privateKey
|
|
if newKey.Equal(oldKey) {
|
|
return nil
|
|
}
|
|
c.privateKey = newKey
|
|
c.havePrivateKey.Store(!newKey.IsZero())
|
|
|
|
if newKey.IsZero() {
|
|
c.publicKeyAtomic.Store(key.NodePublic{})
|
|
} else {
|
|
c.publicKeyAtomic.Store(newKey.Public())
|
|
}
|
|
|
|
if oldKey.IsZero() {
|
|
c.everHadKey = true
|
|
c.logf("magicsock: SetPrivateKey called (init)")
|
|
go c.ReSTUN("set-private-key")
|
|
} else if newKey.IsZero() {
|
|
c.logf("magicsock: SetPrivateKey called (zeroed)")
|
|
c.closeAllDerpLocked("zero-private-key")
|
|
c.stopPeriodicReSTUNTimerLocked()
|
|
c.onEndpointRefreshed = nil
|
|
} else {
|
|
c.logf("magicsock: SetPrivateKey called (changed)")
|
|
c.closeAllDerpLocked("new-private-key")
|
|
}
|
|
|
|
// Key changed. Close existing DERP connections and reconnect to home.
|
|
if c.myDerp != 0 && !newKey.IsZero() {
|
|
c.logf("magicsock: private key changed, reconnecting to home derp-%d", c.myDerp)
|
|
c.startDerpHomeConnectLocked()
|
|
}
|
|
|
|
if newKey.IsZero() {
|
|
c.peerMap.forEachEndpoint(func(ep *endpoint) {
|
|
ep.stopAndReset()
|
|
})
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// UpdatePeers is called when the set of WireGuard peers changes. It
|
|
// then removes any state for old peers.
|
|
//
|
|
// The caller passes ownership of newPeers map to UpdatePeers.
|
|
func (c *Conn) UpdatePeers(newPeers set.Set[key.NodePublic]) {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
|
|
oldPeers := c.peerSet
|
|
c.peerSet = newPeers
|
|
|
|
// Clean up any key.NodePublic-keyed maps for peers that no longer
|
|
// exist.
|
|
for peer := range oldPeers {
|
|
if !newPeers.Contains(peer) {
|
|
delete(c.derpRoute, peer)
|
|
delete(c.peerLastDerp, peer)
|
|
}
|
|
}
|
|
|
|
if len(oldPeers) == 0 && len(newPeers) > 0 {
|
|
go c.ReSTUN("non-zero-peers")
|
|
}
|
|
}
|
|
|
|
func nodesEqual(x, y views.Slice[tailcfg.NodeView]) bool {
|
|
if x.Len() != y.Len() {
|
|
return false
|
|
}
|
|
for i := range x.LenIter() {
|
|
if !x.At(i).Equal(y.At(i)) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// debugRingBufferSize returns a maximum size for our set of endpoint ring
|
|
// buffers by assuming that a single large update is ~500 bytes, and that we
|
|
// want to not use more than 1MiB of memory on phones / 4MiB on other devices.
|
|
// Calculate the per-endpoint ring buffer size by dividing that out, but always
|
|
// storing at least two entries.
|
|
func debugRingBufferSize(numPeers int) int {
|
|
const defaultVal = 2
|
|
if numPeers == 0 {
|
|
return defaultVal
|
|
}
|
|
var maxRingBufferSize int
|
|
if runtime.GOOS == "ios" || runtime.GOOS == "android" {
|
|
maxRingBufferSize = 1 * 1024 * 1024
|
|
} else {
|
|
maxRingBufferSize = 4 * 1024 * 1024
|
|
}
|
|
if v := debugRingBufferMaxSizeBytes(); v > 0 {
|
|
maxRingBufferSize = v
|
|
}
|
|
|
|
const averageRingBufferElemSize = 512
|
|
return max(defaultVal, maxRingBufferSize/(averageRingBufferElemSize*numPeers))
|
|
}
|
|
|
|
// debugFlags are the debug flags in use by the magicsock package.
|
|
// They might be set by envknob and/or controlknob.
|
|
// The value is comparable.
|
|
type debugFlags struct {
|
|
heartbeatDisabled bool
|
|
}
|
|
|
|
func (c *Conn) debugFlagsLocked() (f debugFlags) {
|
|
f.heartbeatDisabled = debugEnableSilentDisco() || c.silentDiscoOn.Load()
|
|
return
|
|
}
|
|
|
|
// SetSilentDisco toggles silent disco based on v.
|
|
func (c *Conn) SetSilentDisco(v bool) {
|
|
old := c.silentDiscoOn.Swap(v)
|
|
if old == v {
|
|
return
|
|
}
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
c.peerMap.forEachEndpoint(func(ep *endpoint) {
|
|
ep.setHeartbeatDisabled(v)
|
|
})
|
|
}
|
|
|
|
// SilentDisco returns true if silent disco is enabled, otherwise false.
|
|
func (c *Conn) SilentDisco() bool {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
flags := c.debugFlagsLocked()
|
|
return flags.heartbeatDisabled
|
|
}
|
|
|
|
// SetNetworkMap is called when the control client gets a new network
|
|
// map from the control server. It must always be non-nil.
|
|
//
|
|
// It should not use the DERPMap field of NetworkMap; that's
|
|
// conditionally sent to SetDERPMap instead.
|
|
func (c *Conn) SetNetworkMap(nm *netmap.NetworkMap) {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
|
|
if c.closed {
|
|
return
|
|
}
|
|
|
|
priorPeers := c.peers
|
|
metricNumPeers.Set(int64(len(nm.Peers)))
|
|
|
|
// Update c.netMap regardless, before the following early return.
|
|
curPeers := views.SliceOf(nm.Peers)
|
|
c.peers = curPeers
|
|
|
|
flags := c.debugFlagsLocked()
|
|
if addrs := nm.GetAddresses(); addrs.Len() > 0 {
|
|
c.firstAddrForTest = addrs.At(0).Addr()
|
|
} else {
|
|
c.firstAddrForTest = netip.Addr{}
|
|
}
|
|
|
|
if nodesEqual(priorPeers, curPeers) && c.lastFlags == flags {
|
|
// The rest of this function is all adjusting state for peers that have
|
|
// changed. But if the set of peers is equal and the debug flags (for
|
|
// silent disco) haven't changed, no need to do anything else.
|
|
return
|
|
}
|
|
|
|
c.lastFlags = flags
|
|
|
|
c.logf("[v1] magicsock: got updated network map; %d peers", len(nm.Peers))
|
|
|
|
entriesPerBuffer := debugRingBufferSize(len(nm.Peers))
|
|
|
|
// Try a pass of just upserting nodes and creating missing
|
|
// endpoints. If the set of nodes is the same, this is an
|
|
// efficient alloc-free update. If the set of nodes is different,
|
|
// we'll fall through to the next pass, which allocates but can
|
|
// handle full set updates.
|
|
for _, n := range nm.Peers {
|
|
if n.ID() == 0 {
|
|
devPanicf("node with zero ID")
|
|
continue
|
|
}
|
|
if n.Key().IsZero() {
|
|
devPanicf("node with zero key")
|
|
continue
|
|
}
|
|
ep, ok := c.peerMap.endpointForNodeID(n.ID())
|
|
if ok && ep.publicKey != n.Key() {
|
|
// The node rotated public keys. Delete the old endpoint and create
|
|
// it anew.
|
|
c.peerMap.deleteEndpoint(ep)
|
|
ok = false
|
|
}
|
|
if ok {
|
|
// At this point we're modifying an existing endpoint (ep) whose
|
|
// public key and nodeID match n. Its other fields (such as disco
|
|
// key or endpoints) might've changed.
|
|
|
|
if n.DiscoKey().IsZero() && !n.IsWireGuardOnly() {
|
|
// Discokey transitioned from non-zero to zero? This should not
|
|
// happen in the wild, however it could mean:
|
|
// 1. A node was downgraded from post 0.100 to pre 0.100.
|
|
// 2. A Tailscale node key was extracted and used on a
|
|
// non-Tailscale node (should not enter here due to the
|
|
// IsWireGuardOnly check)
|
|
// 3. The server is misbehaving.
|
|
c.peerMap.deleteEndpoint(ep)
|
|
continue
|
|
}
|
|
var oldDiscoKey key.DiscoPublic
|
|
if epDisco := ep.disco.Load(); epDisco != nil {
|
|
oldDiscoKey = epDisco.key
|
|
}
|
|
ep.updateFromNode(n, flags.heartbeatDisabled)
|
|
c.peerMap.upsertEndpoint(ep, oldDiscoKey) // maybe update discokey mappings in peerMap
|
|
continue
|
|
}
|
|
|
|
if ep, ok := c.peerMap.endpointForNodeKey(n.Key()); ok {
|
|
// At this point n.Key() should be for a key we've never seen before. If
|
|
// ok was true above, it was an update to an existing matching key and
|
|
// we don't get this far. If ok was false above, that means it's a key
|
|
// that differs from the one the NodeID had. But double check.
|
|
if ep.nodeID != n.ID() {
|
|
// Server error.
|
|
devPanicf("public key moved between nodeIDs (old=%v new=%v, key=%s)", ep.nodeID, n.ID(), n.Key().String())
|
|
} else {
|
|
// Internal data structures out of sync.
|
|
devPanicf("public key found in peerMap but not by nodeID")
|
|
}
|
|
continue
|
|
}
|
|
if n.DiscoKey().IsZero() && !n.IsWireGuardOnly() {
|
|
// Ancient pre-0.100 node, which does not have a disco key.
|
|
// No longer supported.
|
|
continue
|
|
}
|
|
|
|
ep = &endpoint{
|
|
c: c,
|
|
debugUpdates: ringbuffer.New[EndpointChange](entriesPerBuffer),
|
|
nodeID: n.ID(),
|
|
publicKey: n.Key(),
|
|
publicKeyHex: n.Key().UntypedHexString(),
|
|
sentPing: map[stun.TxID]sentPing{},
|
|
endpointState: map[netip.AddrPort]*endpointState{},
|
|
heartbeatDisabled: flags.heartbeatDisabled,
|
|
isWireguardOnly: n.IsWireGuardOnly(),
|
|
}
|
|
if n.Addresses().Len() > 0 {
|
|
ep.nodeAddr = n.Addresses().At(0).Addr()
|
|
}
|
|
ep.initFakeUDPAddr()
|
|
if n.DiscoKey().IsZero() {
|
|
ep.disco.Store(nil)
|
|
} else {
|
|
ep.disco.Store(&endpointDisco{
|
|
key: n.DiscoKey(),
|
|
short: n.DiscoKey().ShortString(),
|
|
})
|
|
}
|
|
|
|
if debugPeerMap() {
|
|
c.logEndpointCreated(n)
|
|
}
|
|
|
|
ep.updateFromNode(n, flags.heartbeatDisabled)
|
|
c.peerMap.upsertEndpoint(ep, key.DiscoPublic{})
|
|
}
|
|
|
|
// If the set of nodes changed since the last SetNetworkMap, the
|
|
// upsert loop just above made c.peerMap contain the union of the
|
|
// old and new peers - which will be larger than the set from the
|
|
// current netmap. If that happens, go through the allocful
|
|
// deletion path to clean up moribund nodes.
|
|
if c.peerMap.nodeCount() != len(nm.Peers) {
|
|
keep := set.Set[key.NodePublic]{}
|
|
for _, n := range nm.Peers {
|
|
keep.Add(n.Key())
|
|
}
|
|
c.peerMap.forEachEndpoint(func(ep *endpoint) {
|
|
if !keep.Contains(ep.publicKey) {
|
|
c.peerMap.deleteEndpoint(ep)
|
|
}
|
|
})
|
|
}
|
|
|
|
// discokeys might have changed in the above. Discard unused info.
|
|
for dk := range c.discoInfo {
|
|
if !c.peerMap.anyEndpointForDiscoKey(dk) {
|
|
delete(c.discoInfo, dk)
|
|
}
|
|
}
|
|
}
|
|
|
|
func devPanicf(format string, a ...any) {
|
|
if testenv.InTest() || envknob.CrashOnUnexpected() {
|
|
panic(fmt.Sprintf(format, a...))
|
|
}
|
|
}
|
|
|
|
func (c *Conn) logEndpointCreated(n tailcfg.NodeView) {
|
|
c.logf("magicsock: created endpoint key=%s: disco=%s; %v", n.Key().ShortString(), n.DiscoKey().ShortString(), logger.ArgWriter(func(w *bufio.Writer) {
|
|
const derpPrefix = "127.3.3.40:"
|
|
if strings.HasPrefix(n.DERP(), derpPrefix) {
|
|
ipp, _ := netip.ParseAddrPort(n.DERP())
|
|
regionID := int(ipp.Port())
|
|
code := c.derpRegionCodeLocked(regionID)
|
|
if code != "" {
|
|
code = "(" + code + ")"
|
|
}
|
|
fmt.Fprintf(w, "derp=%v%s ", regionID, code)
|
|
}
|
|
|
|
for i := range n.AllowedIPs().LenIter() {
|
|
a := n.AllowedIPs().At(i)
|
|
if a.IsSingleIP() {
|
|
fmt.Fprintf(w, "aip=%v ", a.Addr())
|
|
} else {
|
|
fmt.Fprintf(w, "aip=%v ", a)
|
|
}
|
|
}
|
|
for i := range n.Endpoints().LenIter() {
|
|
ep := n.Endpoints().At(i)
|
|
fmt.Fprintf(w, "ep=%v ", ep)
|
|
}
|
|
}))
|
|
}
|
|
|
|
func (c *Conn) logEndpointChange(endpoints []tailcfg.Endpoint) {
|
|
c.logf("magicsock: endpoints changed: %s", logger.ArgWriter(func(buf *bufio.Writer) {
|
|
for i, ep := range endpoints {
|
|
if i > 0 {
|
|
buf.WriteString(", ")
|
|
}
|
|
fmt.Fprintf(buf, "%s (%s)", ep.Addr, ep.Type)
|
|
}
|
|
}))
|
|
}
|
|
|
|
// Bind returns the wireguard-go conn.Bind for c.
|
|
//
|
|
// See https://pkg.go.dev/golang.zx2c4.com/wireguard/conn#Bind
|
|
func (c *Conn) Bind() conn.Bind {
|
|
return c.bind
|
|
}
|
|
|
|
// connBind is a wireguard-go conn.Bind for a Conn.
|
|
// It bridges the behavior of wireguard-go and a Conn.
|
|
// wireguard-go calls Close then Open on device.Up.
|
|
// That won't work well for a Conn, which is only closed on shutdown.
|
|
// The subsequent Close is a real close.
|
|
type connBind struct {
|
|
*Conn
|
|
mu sync.Mutex
|
|
closed bool
|
|
}
|
|
|
|
// This is a compile-time assertion that connBind implements the wireguard-go
|
|
// conn.Bind interface.
|
|
var _ conn.Bind = (*connBind)(nil)
|
|
|
|
// BatchSize returns the number of buffers expected to be passed to
|
|
// the ReceiveFuncs, and the maximum expected to be passed to SendBatch.
|
|
//
|
|
// See https://pkg.go.dev/golang.zx2c4.com/wireguard/conn#Bind.BatchSize
|
|
func (c *connBind) BatchSize() int {
|
|
// TODO(raggi): determine by properties rather than hardcoding platform behavior
|
|
switch runtime.GOOS {
|
|
case "linux":
|
|
return conn.IdealBatchSize
|
|
default:
|
|
return 1
|
|
}
|
|
}
|
|
|
|
// Open is called by WireGuard to create a UDP binding.
|
|
// The ignoredPort comes from wireguard-go, via the wgcfg config.
|
|
// We ignore that port value here, since we have the local port available easily.
|
|
//
|
|
// See https://pkg.go.dev/golang.zx2c4.com/wireguard/conn#Bind.Open
|
|
func (c *connBind) Open(ignoredPort uint16) ([]conn.ReceiveFunc, uint16, error) {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
if !c.closed {
|
|
return nil, 0, errors.New("magicsock: connBind already open")
|
|
}
|
|
c.closed = false
|
|
fns := []conn.ReceiveFunc{c.receiveIPv4(), c.receiveIPv6(), c.receiveDERP}
|
|
if runtime.GOOS == "js" {
|
|
fns = []conn.ReceiveFunc{c.receiveDERP}
|
|
}
|
|
// TODO: Combine receiveIPv4 and receiveIPv6 and receiveIP into a single
|
|
// closure that closes over a *RebindingUDPConn?
|
|
return fns, c.LocalPort(), nil
|
|
}
|
|
|
|
// SetMark is used by wireguard-go to set a mark bit for packets to avoid routing loops.
|
|
// We handle that ourselves elsewhere.
|
|
//
|
|
// See https://pkg.go.dev/golang.zx2c4.com/wireguard/conn#Bind.SetMark
|
|
func (c *connBind) SetMark(value uint32) error {
|
|
return nil
|
|
}
|
|
|
|
// Close closes the connBind, unless it is already closed.
|
|
//
|
|
// See https://pkg.go.dev/golang.zx2c4.com/wireguard/conn#Bind.Close
|
|
func (c *connBind) Close() error {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
if c.closed {
|
|
return nil
|
|
}
|
|
c.closed = true
|
|
// Unblock all outstanding receives.
|
|
c.pconn4.Close()
|
|
c.pconn6.Close()
|
|
if c.closeDisco4 != nil {
|
|
c.closeDisco4.Close()
|
|
}
|
|
if c.closeDisco6 != nil {
|
|
c.closeDisco6.Close()
|
|
}
|
|
// Send an empty read result to unblock receiveDERP,
|
|
// which will then check connBind.Closed.
|
|
// connBind.Closed takes c.mu, but c.derpRecvCh is buffered.
|
|
c.derpRecvCh <- derpReadResult{}
|
|
return nil
|
|
}
|
|
|
|
// isClosed reports whether c is closed.
|
|
func (c *connBind) isClosed() bool {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
return c.closed
|
|
}
|
|
|
|
// Close closes the connection.
|
|
//
|
|
// Only the first close does anything. Any later closes return nil.
|
|
func (c *Conn) Close() error {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
if c.closed {
|
|
return nil
|
|
}
|
|
c.closing.Store(true)
|
|
if c.derpCleanupTimerArmed {
|
|
c.derpCleanupTimer.Stop()
|
|
}
|
|
c.stopPeriodicReSTUNTimerLocked()
|
|
c.portMapper.Close()
|
|
|
|
c.peerMap.forEachEndpoint(func(ep *endpoint) {
|
|
ep.stopAndReset()
|
|
})
|
|
|
|
c.closed = true
|
|
c.connCtxCancel()
|
|
c.closeAllDerpLocked("conn-close")
|
|
// Ignore errors from c.pconnN.Close.
|
|
// They will frequently have been closed already by a call to connBind.Close.
|
|
c.pconn6.Close()
|
|
c.pconn4.Close()
|
|
if c.closeDisco4 != nil {
|
|
c.closeDisco4.Close()
|
|
}
|
|
if c.closeDisco6 != nil {
|
|
c.closeDisco6.Close()
|
|
}
|
|
|
|
// Wait on goroutines updating right at the end, once everything is
|
|
// already closed. We want everything else in the Conn to be
|
|
// consistently in the closed state before we release mu to wait
|
|
// on the endpoint updater & derphttp.Connect.
|
|
for c.goroutinesRunningLocked() {
|
|
c.muCond.Wait()
|
|
}
|
|
|
|
if pinger := c.getPinger(); pinger != nil {
|
|
pinger.Close()
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (c *Conn) goroutinesRunningLocked() bool {
|
|
if c.endpointsUpdateActive {
|
|
return true
|
|
}
|
|
// The goroutine running dc.Connect in derpWriteChanOfAddr may linger
|
|
// and appear to leak, as observed in https://github.com/tailscale/tailscale/issues/554.
|
|
// This is despite the underlying context being cancelled by connCtxCancel above.
|
|
// To avoid this condition, we must wait on derpStarted here
|
|
// to ensure that this goroutine has exited by the time Close returns.
|
|
// We only do this if derpWriteChanOfAddr has executed at least once:
|
|
// on the first run, it sets firstDerp := true and spawns the aforementioned goroutine.
|
|
// To detect this, we check activeDerp, which is initialized to non-nil on the first run.
|
|
if c.activeDerp != nil {
|
|
select {
|
|
case <-c.derpStarted:
|
|
default:
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (c *Conn) shouldDoPeriodicReSTUNLocked() bool {
|
|
if c.networkDown() || c.homeless {
|
|
return false
|
|
}
|
|
if len(c.peerSet) == 0 || c.privateKey.IsZero() {
|
|
// If no peers, not worth doing.
|
|
// Also don't if there's no key (not running).
|
|
return false
|
|
}
|
|
if f := c.idleFunc; f != nil {
|
|
idleFor := f()
|
|
if debugReSTUNStopOnIdle() {
|
|
c.logf("magicsock: periodicReSTUN: idle for %v", idleFor.Round(time.Second))
|
|
}
|
|
if idleFor > sessionActiveTimeout {
|
|
if c.controlKnobs != nil && c.controlKnobs.ForceBackgroundSTUN.Load() {
|
|
// Overridden by control.
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
func (c *Conn) onPortMapChanged() { c.ReSTUN("portmap-changed") }
|
|
|
|
// ReSTUN triggers an address discovery.
|
|
// The provided why string is for debug logging only.
|
|
func (c *Conn) ReSTUN(why string) {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
if c.closed {
|
|
// raced with a shutdown.
|
|
return
|
|
}
|
|
metricReSTUNCalls.Add(1)
|
|
|
|
// If the user stopped the app, stop doing work. (When the
|
|
// user stops Tailscale via the GUI apps, ipn/local.go
|
|
// reconfigures the engine with a zero private key.)
|
|
//
|
|
// This used to just check c.privateKey.IsZero, but that broke
|
|
// some end-to-end tests that didn't ever set a private
|
|
// key somehow. So for now, only stop doing work if we ever
|
|
// had a key, which helps real users, but appeases tests for
|
|
// now. TODO: rewrite those tests to be less brittle or more
|
|
// realistic.
|
|
if c.privateKey.IsZero() && c.everHadKey {
|
|
c.logf("magicsock: ReSTUN(%q) ignored; stopped, no private key", why)
|
|
return
|
|
}
|
|
|
|
if c.endpointsUpdateActive {
|
|
if c.wantEndpointsUpdate != why {
|
|
c.dlogf("[v1] magicsock: ReSTUN: endpoint update active, need another later (%q)", why)
|
|
c.wantEndpointsUpdate = why
|
|
}
|
|
} else {
|
|
c.endpointsUpdateActive = true
|
|
go c.updateEndpoints(why)
|
|
}
|
|
}
|
|
|
|
// listenPacket opens a packet listener.
|
|
// The network must be "udp4" or "udp6".
|
|
func (c *Conn) listenPacket(network string, port uint16) (nettype.PacketConn, error) {
|
|
ctx := context.Background() // unused without DNS name to resolve
|
|
if network == "udp4" {
|
|
ctx = sockstats.WithSockStats(ctx, sockstats.LabelMagicsockConnUDP4, c.logf)
|
|
} else {
|
|
ctx = sockstats.WithSockStats(ctx, sockstats.LabelMagicsockConnUDP6, c.logf)
|
|
}
|
|
addr := net.JoinHostPort("", fmt.Sprint(port))
|
|
if c.testOnlyPacketListener != nil {
|
|
return nettype.MakePacketListenerWithNetIP(c.testOnlyPacketListener).ListenPacket(ctx, network, addr)
|
|
}
|
|
return nettype.MakePacketListenerWithNetIP(netns.Listener(c.logf, c.netMon)).ListenPacket(ctx, network, addr)
|
|
}
|
|
|
|
// bindSocket initializes rucPtr if necessary and binds a UDP socket to it.
|
|
// Network indicates the UDP socket type; it must be "udp4" or "udp6".
|
|
// If rucPtr had an existing UDP socket bound, it closes that socket.
|
|
// The caller is responsible for informing the portMapper of any changes.
|
|
// If curPortFate is set to dropCurrentPort, no attempt is made to reuse
|
|
// the current port.
|
|
func (c *Conn) bindSocket(ruc *RebindingUDPConn, network string, curPortFate currentPortFate) error {
|
|
if debugBindSocket() {
|
|
c.logf("magicsock: bindSocket: network=%q curPortFate=%v", network, curPortFate)
|
|
}
|
|
|
|
// Hold the ruc lock the entire time, so that the close+bind is atomic
|
|
// from the perspective of ruc receive functions.
|
|
ruc.mu.Lock()
|
|
defer ruc.mu.Unlock()
|
|
|
|
if runtime.GOOS == "js" {
|
|
ruc.setConnLocked(newBlockForeverConn(), "", c.bind.BatchSize())
|
|
return nil
|
|
}
|
|
|
|
if debugAlwaysDERP() {
|
|
c.logf("disabled %v per TS_DEBUG_ALWAYS_USE_DERP", network)
|
|
ruc.setConnLocked(newBlockForeverConn(), "", c.bind.BatchSize())
|
|
return nil
|
|
}
|
|
|
|
// Build a list of preferred ports.
|
|
// Best is the port that the user requested.
|
|
// Second best is the port that is currently in use.
|
|
// If those fail, fall back to 0.
|
|
var ports []uint16
|
|
if port := uint16(c.port.Load()); port != 0 {
|
|
ports = append(ports, port)
|
|
}
|
|
if ruc.pconn != nil && curPortFate == keepCurrentPort {
|
|
curPort := uint16(ruc.localAddrLocked().Port)
|
|
ports = append(ports, curPort)
|
|
}
|
|
ports = append(ports, 0)
|
|
// Remove duplicates. (All duplicates are consecutive.)
|
|
uniq.ModifySlice(&ports)
|
|
|
|
if debugBindSocket() {
|
|
c.logf("magicsock: bindSocket: candidate ports: %+v", ports)
|
|
}
|
|
|
|
var pconn nettype.PacketConn
|
|
for _, port := range ports {
|
|
// Close the existing conn, in case it is sitting on the port we want.
|
|
err := ruc.closeLocked()
|
|
if err != nil && !errors.Is(err, net.ErrClosed) && !errors.Is(err, errNilPConn) {
|
|
c.logf("magicsock: bindSocket %v close failed: %v", network, err)
|
|
}
|
|
// Open a new one with the desired port.
|
|
pconn, err = c.listenPacket(network, port)
|
|
if err != nil {
|
|
c.logf("magicsock: unable to bind %v port %d: %v", network, port, err)
|
|
continue
|
|
}
|
|
trySetSocketBuffer(pconn, c.logf)
|
|
|
|
// Success.
|
|
if debugBindSocket() {
|
|
c.logf("magicsock: bindSocket: successfully listened %v port %d", network, port)
|
|
}
|
|
ruc.setConnLocked(pconn, network, c.bind.BatchSize())
|
|
if network == "udp4" {
|
|
health.SetUDP4Unbound(false)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Failed to bind, including on port 0 (!).
|
|
// Set pconn to a dummy conn whose reads block until closed.
|
|
// This keeps the receive funcs alive for a future in which
|
|
// we get a link change and we can try binding again.
|
|
ruc.setConnLocked(newBlockForeverConn(), "", c.bind.BatchSize())
|
|
if network == "udp4" {
|
|
health.SetUDP4Unbound(true)
|
|
}
|
|
return fmt.Errorf("failed to bind any ports (tried %v)", ports)
|
|
}
|
|
|
|
type currentPortFate uint8
|
|
|
|
const (
|
|
keepCurrentPort = currentPortFate(0)
|
|
dropCurrentPort = currentPortFate(1)
|
|
)
|
|
|
|
// rebind closes and re-binds the UDP sockets.
|
|
// We consider it successful if we manage to bind the IPv4 socket.
|
|
func (c *Conn) rebind(curPortFate currentPortFate) error {
|
|
if err := c.bindSocket(&c.pconn6, "udp6", curPortFate); err != nil {
|
|
c.logf("magicsock: Rebind ignoring IPv6 bind failure: %v", err)
|
|
}
|
|
if err := c.bindSocket(&c.pconn4, "udp4", curPortFate); err != nil {
|
|
return fmt.Errorf("magicsock: Rebind IPv4 failed: %w", err)
|
|
}
|
|
c.portMapper.SetLocalPort(c.LocalPort())
|
|
c.UpdatePMTUD()
|
|
return nil
|
|
}
|
|
|
|
// Rebind closes and re-binds the UDP sockets and resets the DERP connection.
|
|
// It should be followed by a call to ReSTUN.
|
|
func (c *Conn) Rebind() {
|
|
metricRebindCalls.Add(1)
|
|
if err := c.rebind(keepCurrentPort); err != nil {
|
|
c.logf("%v", err)
|
|
return
|
|
}
|
|
|
|
var ifIPs []netip.Prefix
|
|
if c.netMon != nil {
|
|
st := c.netMon.InterfaceState()
|
|
defIf := st.DefaultRouteInterface
|
|
ifIPs = st.InterfaceIPs[defIf]
|
|
c.logf("Rebind; defIf=%q, ips=%v", defIf, ifIPs)
|
|
}
|
|
|
|
c.maybeCloseDERPsOnRebind(ifIPs)
|
|
c.resetEndpointStates()
|
|
}
|
|
|
|
// resetEndpointStates resets the preferred address for all peers.
|
|
// This is called when connectivity changes enough that we no longer
|
|
// trust the old routes.
|
|
func (c *Conn) resetEndpointStates() {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
c.peerMap.forEachEndpoint(func(ep *endpoint) {
|
|
ep.noteConnectivityChange()
|
|
})
|
|
}
|
|
|
|
// packIPPort packs an IPPort into the form wanted by WireGuard.
|
|
func packIPPort(ua netip.AddrPort) []byte {
|
|
ip := ua.Addr().Unmap()
|
|
a := ip.As16()
|
|
ipb := a[:]
|
|
if ip.Is4() {
|
|
ipb = ipb[12:]
|
|
}
|
|
b := make([]byte, 0, len(ipb)+2)
|
|
b = append(b, ipb...)
|
|
b = append(b, byte(ua.Port()))
|
|
b = append(b, byte(ua.Port()>>8))
|
|
return b
|
|
}
|
|
|
|
// ParseEndpoint implements conn.Bind; it's called by WireGuard to connect to an endpoint.
|
|
//
|
|
// See https://pkg.go.dev/golang.zx2c4.com/wireguard/conn#Bind.ParseEndpoint
|
|
func (c *Conn) ParseEndpoint(nodeKeyStr string) (conn.Endpoint, error) {
|
|
k, err := key.ParseNodePublicUntyped(mem.S(nodeKeyStr))
|
|
if err != nil {
|
|
return nil, fmt.Errorf("magicsock: ParseEndpoint: parse failed on %q: %w", nodeKeyStr, err)
|
|
}
|
|
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
if c.closed {
|
|
return nil, errConnClosed
|
|
}
|
|
ep, ok := c.peerMap.endpointForNodeKey(k)
|
|
if !ok {
|
|
// We should never be telling WireGuard about a new peer
|
|
// before magicsock knows about it.
|
|
c.logf("[unexpected] magicsock: ParseEndpoint: unknown node key=%s", k.ShortString())
|
|
return nil, fmt.Errorf("magicsock: ParseEndpoint: unknown peer %q", k.ShortString())
|
|
}
|
|
|
|
return ep, nil
|
|
}
|
|
|
|
func (c *batchingUDPConn) writeBatch(msgs []ipv6.Message) error {
|
|
var head int
|
|
for {
|
|
n, err := c.xpc.WriteBatch(msgs[head:], 0)
|
|
if err != nil || n == len(msgs[head:]) {
|
|
// Returning the number of packets written would require
|
|
// unraveling individual msg len and gso size during a coalesced
|
|
// write. The top of the call stack disregards partial success,
|
|
// so keep this simple for now.
|
|
return err
|
|
}
|
|
head += n
|
|
}
|
|
}
|
|
|
|
// splitCoalescedMessages splits coalesced messages from the tail of dst
|
|
// beginning at index 'firstMsgAt' into the head of the same slice. It reports
|
|
// the number of elements to evaluate in msgs for nonzero len (msgs[i].N). An
|
|
// error is returned if a socket control message cannot be parsed or a split
|
|
// operation would overflow msgs.
|
|
func (c *batchingUDPConn) splitCoalescedMessages(msgs []ipv6.Message, firstMsgAt int) (n int, err error) {
|
|
for i := firstMsgAt; i < len(msgs); i++ {
|
|
msg := &msgs[i]
|
|
if msg.N == 0 {
|
|
return n, err
|
|
}
|
|
var (
|
|
gsoSize int
|
|
start int
|
|
end = msg.N
|
|
numToSplit = 1
|
|
)
|
|
gsoSize, err = c.getGSOSizeFromControl(msg.OOB[:msg.NN])
|
|
if err != nil {
|
|
return n, err
|
|
}
|
|
if gsoSize > 0 {
|
|
numToSplit = (msg.N + gsoSize - 1) / gsoSize
|
|
end = gsoSize
|
|
}
|
|
for j := 0; j < numToSplit; j++ {
|
|
if n > i {
|
|
return n, errors.New("splitting coalesced packet resulted in overflow")
|
|
}
|
|
copied := copy(msgs[n].Buffers[0], msg.Buffers[0][start:end])
|
|
msgs[n].N = copied
|
|
msgs[n].Addr = msg.Addr
|
|
start = end
|
|
end += gsoSize
|
|
if end > msg.N {
|
|
end = msg.N
|
|
}
|
|
n++
|
|
}
|
|
if i != n-1 {
|
|
// It is legal for bytes to move within msg.Buffers[0] as a result
|
|
// of splitting, so we only zero the source msg len when it is not
|
|
// the destination of the last split operation above.
|
|
msg.N = 0
|
|
}
|
|
}
|
|
return n, nil
|
|
}
|
|
|
|
func (c *batchingUDPConn) ReadBatch(msgs []ipv6.Message, flags int) (n int, err error) {
|
|
if !c.rxOffload || len(msgs) < 2 {
|
|
return c.xpc.ReadBatch(msgs, flags)
|
|
}
|
|
// Read into the tail of msgs, split into the head.
|
|
readAt := len(msgs) - 2
|
|
numRead, err := c.xpc.ReadBatch(msgs[readAt:], 0)
|
|
if err != nil || numRead == 0 {
|
|
return 0, err
|
|
}
|
|
return c.splitCoalescedMessages(msgs, readAt)
|
|
}
|
|
|
|
func (c *batchingUDPConn) LocalAddr() net.Addr {
|
|
return c.pc.LocalAddr().(*net.UDPAddr)
|
|
}
|
|
|
|
func (c *batchingUDPConn) WriteToUDPAddrPort(b []byte, addr netip.AddrPort) (int, error) {
|
|
return c.pc.WriteToUDPAddrPort(b, addr)
|
|
}
|
|
|
|
func (c *batchingUDPConn) Close() error {
|
|
return c.pc.Close()
|
|
}
|
|
|
|
// tryUpgradeToBatchingUDPConn probes the capabilities of the OS and pconn, and
|
|
// upgrades pconn to a *batchingUDPConn if appropriate.
|
|
func tryUpgradeToBatchingUDPConn(pconn nettype.PacketConn, network string, batchSize int) nettype.PacketConn {
|
|
if network != "udp4" && network != "udp6" {
|
|
return pconn
|
|
}
|
|
if runtime.GOOS != "linux" {
|
|
return pconn
|
|
}
|
|
if strings.HasPrefix(hostinfo.GetOSVersion(), "2.") {
|
|
// recvmmsg/sendmmsg were added in 2.6.33, but we support down to
|
|
// 2.6.32 for old NAS devices. See https://github.com/tailscale/tailscale/issues/6807.
|
|
// As a cheap heuristic: if the Linux kernel starts with "2", just
|
|
// consider it too old for mmsg. Nobody who cares about performance runs
|
|
// such ancient kernels. UDP offload was added much later, so no
|
|
// upgrades are available.
|
|
return pconn
|
|
}
|
|
uc, ok := pconn.(*net.UDPConn)
|
|
if !ok {
|
|
return pconn
|
|
}
|
|
b := &batchingUDPConn{
|
|
pc: pconn,
|
|
getGSOSizeFromControl: getGSOSizeFromControl,
|
|
setGSOSizeInControl: setGSOSizeInControl,
|
|
sendBatchPool: sync.Pool{
|
|
New: func() any {
|
|
ua := &net.UDPAddr{
|
|
IP: make([]byte, 16),
|
|
}
|
|
msgs := make([]ipv6.Message, batchSize)
|
|
for i := range msgs {
|
|
msgs[i].Buffers = make([][]byte, 1)
|
|
msgs[i].Addr = ua
|
|
msgs[i].OOB = make([]byte, controlMessageSize)
|
|
}
|
|
return &sendBatch{
|
|
ua: ua,
|
|
msgs: msgs,
|
|
}
|
|
},
|
|
},
|
|
}
|
|
switch network {
|
|
case "udp4":
|
|
b.xpc = ipv4.NewPacketConn(uc)
|
|
case "udp6":
|
|
b.xpc = ipv6.NewPacketConn(uc)
|
|
default:
|
|
panic("bogus network")
|
|
}
|
|
var txOffload bool
|
|
txOffload, b.rxOffload = tryEnableUDPOffload(uc)
|
|
b.txOffload.Store(txOffload)
|
|
return b
|
|
}
|
|
|
|
func newBlockForeverConn() *blockForeverConn {
|
|
c := new(blockForeverConn)
|
|
c.cond = sync.NewCond(&c.mu)
|
|
return c
|
|
}
|
|
|
|
// simpleDur rounds d such that it stringifies to something short.
|
|
func simpleDur(d time.Duration) time.Duration {
|
|
if d < time.Second {
|
|
return d.Round(time.Millisecond)
|
|
}
|
|
if d < time.Minute {
|
|
return d.Round(time.Second)
|
|
}
|
|
return d.Round(time.Minute)
|
|
}
|
|
|
|
// UpdateNetmapDelta implements controlclient.NetmapDeltaUpdater.
|
|
func (c *Conn) UpdateNetmapDelta(muts []netmap.NodeMutation) (handled bool) {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
|
|
for _, m := range muts {
|
|
nodeID := m.NodeIDBeingMutated()
|
|
ep, ok := c.peerMap.endpointForNodeID(nodeID)
|
|
if !ok {
|
|
continue
|
|
}
|
|
switch m := m.(type) {
|
|
case netmap.NodeMutationDERPHome:
|
|
ep.setDERPHome(uint16(m.DERPRegion))
|
|
case netmap.NodeMutationEndpoints:
|
|
ep.mu.Lock()
|
|
ep.setEndpointsLocked(views.SliceOf(m.Endpoints))
|
|
ep.mu.Unlock()
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// UpdateStatus implements the interface nede by ipnstate.StatusBuilder.
|
|
//
|
|
// This method adds in the magicsock-specific information only. Most
|
|
// of the status is otherwise populated by LocalBackend.
|
|
func (c *Conn) UpdateStatus(sb *ipnstate.StatusBuilder) {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
|
|
sb.MutateSelfStatus(func(ss *ipnstate.PeerStatus) {
|
|
ss.Addrs = make([]string, 0, len(c.lastEndpoints))
|
|
for _, ep := range c.lastEndpoints {
|
|
ss.Addrs = append(ss.Addrs, ep.Addr.String())
|
|
}
|
|
if c.derpMap != nil {
|
|
if reg, ok := c.derpMap.Regions[c.myDerp]; ok {
|
|
ss.Relay = reg.RegionCode
|
|
}
|
|
}
|
|
})
|
|
|
|
if sb.WantPeers {
|
|
c.peerMap.forEachEndpoint(func(ep *endpoint) {
|
|
ps := &ipnstate.PeerStatus{InMagicSock: true}
|
|
ep.populatePeerStatus(ps)
|
|
sb.AddPeer(ep.publicKey, ps)
|
|
})
|
|
}
|
|
|
|
c.foreachActiveDerpSortedLocked(func(node int, ad activeDerp) {
|
|
// TODO(bradfitz): add a method to ipnstate.StatusBuilder
|
|
// to include all the DERP connections we have open
|
|
// and add it here. See the other caller of foreachActiveDerpSortedLocked.
|
|
})
|
|
}
|
|
|
|
// SetStatistics specifies a per-connection statistics aggregator.
|
|
// Nil may be specified to disable statistics gathering.
|
|
func (c *Conn) SetStatistics(stats *connstats.Statistics) {
|
|
c.stats.Store(stats)
|
|
}
|
|
|
|
// SetHomeless sets whether magicsock should idle harder and not have a DERP
|
|
// home connection active and not search for its nearest DERP home. In this
|
|
// homeless mode, the node is unreachable by others.
|
|
func (c *Conn) SetHomeless(v bool) {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
c.homeless = v
|
|
|
|
if v && c.myDerp != 0 {
|
|
oldHome := c.myDerp
|
|
c.myDerp = 0
|
|
c.closeDerpLocked(oldHome, "set-homeless")
|
|
}
|
|
if !v {
|
|
go c.updateEndpoints("set-homeless-disabled")
|
|
}
|
|
}
|
|
|
|
const (
|
|
// sessionActiveTimeout is how long since the last activity we
|
|
// try to keep an established endpoint peering alive.
|
|
// It's also the idle time at which we stop doing STUN queries to
|
|
// keep NAT mappings alive.
|
|
sessionActiveTimeout = 45 * time.Second
|
|
|
|
// upgradeInterval is how often we try to upgrade to a better path
|
|
// even if we have some non-DERP route that works.
|
|
upgradeInterval = 1 * time.Minute
|
|
|
|
// heartbeatInterval is how often pings to the best UDP address
|
|
// are sent.
|
|
heartbeatInterval = 3 * time.Second
|
|
|
|
// trustUDPAddrDuration is how long we trust a UDP address as the exclusive
|
|
// path (without using DERP) without having heard a Pong reply.
|
|
trustUDPAddrDuration = 6500 * time.Millisecond
|
|
|
|
// goodEnoughLatency is the latency at or under which we don't
|
|
// try to upgrade to a better path.
|
|
goodEnoughLatency = 5 * time.Millisecond
|
|
|
|
// endpointsFreshEnoughDuration is how long we consider a
|
|
// STUN-derived endpoint valid for. UDP NAT mappings typically
|
|
// expire at 30 seconds, so this is a few seconds shy of that.
|
|
endpointsFreshEnoughDuration = 27 * time.Second
|
|
)
|
|
|
|
// Constants that are variable for testing.
|
|
var (
|
|
// pingTimeoutDuration is how long we wait for a pong reply before
|
|
// assuming it's never coming.
|
|
pingTimeoutDuration = 5 * time.Second
|
|
|
|
// discoPingInterval is the minimum time between pings
|
|
// to an endpoint. (Except in the case of CallMeMaybe frames
|
|
// resetting the counter, as the first pings likely didn't through
|
|
// the firewall)
|
|
discoPingInterval = 5 * time.Second
|
|
|
|
// wireguardPingInterval is the minimum time between pings to an endpoint.
|
|
// Pings are only sent if we have not observed bidirectional traffic with an
|
|
// endpoint in at least this duration.
|
|
wireguardPingInterval = 5 * time.Second
|
|
)
|
|
|
|
// indexSentinelDeleted is the temporary value that endpointState.index takes while
|
|
// a endpoint's endpoints are being updated from a new network map.
|
|
const indexSentinelDeleted = -1
|
|
|
|
// getPinger lazily instantiates a pinger and returns it, if it was
|
|
// already instantiated it returns the existing one.
|
|
func (c *Conn) getPinger() *ping.Pinger {
|
|
return c.wgPinger.Get(func() *ping.Pinger {
|
|
return ping.New(c.connCtx, c.dlogf, netns.Listener(c.logf, c.netMon))
|
|
})
|
|
}
|
|
|
|
// DebugPickNewDERP picks a new DERP random home temporarily (even if just for
|
|
// seconds) and reports it to control. It exists to test DERP home changes and
|
|
// netmap deltas, etc. It serves no useful user purpose.
|
|
func (c *Conn) DebugPickNewDERP() error {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
dm := c.derpMap
|
|
if dm == nil {
|
|
return errors.New("no derpmap")
|
|
}
|
|
if c.netInfoLast == nil {
|
|
return errors.New("no netinfo")
|
|
}
|
|
for _, r := range dm.Regions {
|
|
if r.RegionID == c.myDerp {
|
|
continue
|
|
}
|
|
c.logf("magicsock: [debug] switching derp home to random %v (%v)", r.RegionID, r.RegionCode)
|
|
go c.setNearestDERP(r.RegionID)
|
|
ni2 := c.netInfoLast.Clone()
|
|
ni2.PreferredDERP = r.RegionID
|
|
c.callNetInfoCallbackLocked(ni2)
|
|
return nil
|
|
}
|
|
return errors.New("too few regions")
|
|
}
|
|
|
|
// portableTrySetSocketBuffer sets SO_SNDBUF and SO_RECVBUF on pconn to socketBufferSize,
|
|
// logging an error if it occurs.
|
|
func portableTrySetSocketBuffer(pconn nettype.PacketConn, logf logger.Logf) {
|
|
if c, ok := pconn.(*net.UDPConn); ok {
|
|
// Attempt to increase the buffer size, and allow failures.
|
|
if err := c.SetReadBuffer(socketBufferSize); err != nil {
|
|
logf("magicsock: failed to set UDP read buffer size to %d: %v", socketBufferSize, err)
|
|
}
|
|
if err := c.SetWriteBuffer(socketBufferSize); err != nil {
|
|
logf("magicsock: failed to set UDP write buffer size to %d: %v", socketBufferSize, err)
|
|
}
|
|
}
|
|
}
|
|
|
|
// derpStr replaces DERP IPs in s with "derp-".
|
|
func derpStr(s string) string { return strings.ReplaceAll(s, "127.3.3.40:", "derp-") }
|
|
|
|
// ippEndpointCache is a mutex-free single-element cache, mapping from
|
|
// a single netip.AddrPort to a single endpoint.
|
|
type ippEndpointCache struct {
|
|
ipp netip.AddrPort
|
|
gen int64
|
|
de *endpoint
|
|
}
|
|
|
|
// discoInfo is the info and state for the DiscoKey
|
|
// in the Conn.discoInfo map key.
|
|
//
|
|
// Note that a DiscoKey does not necessarily map to exactly one
|
|
// node. In the case of shared nodes and users switching accounts, two
|
|
// nodes in the NetMap may legitimately have the same DiscoKey. As
|
|
// such, no fields in here should be considered node-specific.
|
|
type discoInfo struct {
|
|
// discoKey is the same as the Conn.discoInfo map key,
|
|
// just so you can pass around a *discoInfo alone.
|
|
// Not modified once initialized.
|
|
discoKey key.DiscoPublic
|
|
|
|
// discoShort is discoKey.ShortString().
|
|
// Not modified once initialized;
|
|
discoShort string
|
|
|
|
// sharedKey is the precomputed key for communication with the
|
|
// peer that has the DiscoKey used to look up this *discoInfo in
|
|
// Conn.discoInfo.
|
|
// Not modified once initialized.
|
|
sharedKey key.DiscoShared
|
|
|
|
// Mutable fields follow, owned by Conn.mu:
|
|
|
|
// lastPingFrom is the src of a ping for discoKey.
|
|
lastPingFrom netip.AddrPort
|
|
|
|
// lastPingTime is the last time of a ping for discoKey.
|
|
lastPingTime time.Time
|
|
}
|
|
|
|
var (
|
|
metricNumPeers = clientmetric.NewGauge("magicsock_netmap_num_peers")
|
|
metricNumDERPConns = clientmetric.NewGauge("magicsock_num_derp_conns")
|
|
|
|
metricRebindCalls = clientmetric.NewCounter("magicsock_rebind_calls")
|
|
metricReSTUNCalls = clientmetric.NewCounter("magicsock_restun_calls")
|
|
metricUpdateEndpoints = clientmetric.NewCounter("magicsock_update_endpoints")
|
|
|
|
// Sends (data or disco)
|
|
metricSendDERPQueued = clientmetric.NewCounter("magicsock_send_derp_queued")
|
|
metricSendDERPErrorChan = clientmetric.NewCounter("magicsock_send_derp_error_chan")
|
|
metricSendDERPErrorClosed = clientmetric.NewCounter("magicsock_send_derp_error_closed")
|
|
metricSendDERPErrorQueue = clientmetric.NewCounter("magicsock_send_derp_error_queue")
|
|
metricSendUDP = clientmetric.NewCounter("magicsock_send_udp")
|
|
metricSendUDPError = clientmetric.NewCounter("magicsock_send_udp_error")
|
|
metricSendDERP = clientmetric.NewCounter("magicsock_send_derp")
|
|
metricSendDERPError = clientmetric.NewCounter("magicsock_send_derp_error")
|
|
|
|
// Data packets (non-disco)
|
|
metricSendData = clientmetric.NewCounter("magicsock_send_data")
|
|
metricSendDataNetworkDown = clientmetric.NewCounter("magicsock_send_data_network_down")
|
|
metricRecvDataDERP = clientmetric.NewCounter("magicsock_recv_data_derp")
|
|
metricRecvDataIPv4 = clientmetric.NewCounter("magicsock_recv_data_ipv4")
|
|
metricRecvDataIPv6 = clientmetric.NewCounter("magicsock_recv_data_ipv6")
|
|
|
|
// Disco packets
|
|
metricSendDiscoUDP = clientmetric.NewCounter("magicsock_disco_send_udp")
|
|
metricSendDiscoDERP = clientmetric.NewCounter("magicsock_disco_send_derp")
|
|
metricSentDiscoUDP = clientmetric.NewCounter("magicsock_disco_sent_udp")
|
|
metricSentDiscoDERP = clientmetric.NewCounter("magicsock_disco_sent_derp")
|
|
metricSentDiscoPing = clientmetric.NewCounter("magicsock_disco_sent_ping")
|
|
metricSentDiscoPong = clientmetric.NewCounter("magicsock_disco_sent_pong")
|
|
metricSentDiscoPeerMTUProbes = clientmetric.NewCounter("magicsock_disco_sent_peer_mtu_probes")
|
|
metricSentDiscoPeerMTUProbeBytes = clientmetric.NewCounter("magicsock_disco_sent_peer_mtu_probe_bytes")
|
|
metricSentDiscoCallMeMaybe = clientmetric.NewCounter("magicsock_disco_sent_callmemaybe")
|
|
metricRecvDiscoBadPeer = clientmetric.NewCounter("magicsock_disco_recv_bad_peer")
|
|
metricRecvDiscoBadKey = clientmetric.NewCounter("magicsock_disco_recv_bad_key")
|
|
metricRecvDiscoBadParse = clientmetric.NewCounter("magicsock_disco_recv_bad_parse")
|
|
|
|
metricRecvDiscoUDP = clientmetric.NewCounter("magicsock_disco_recv_udp")
|
|
metricRecvDiscoDERP = clientmetric.NewCounter("magicsock_disco_recv_derp")
|
|
metricRecvDiscoPing = clientmetric.NewCounter("magicsock_disco_recv_ping")
|
|
metricRecvDiscoPong = clientmetric.NewCounter("magicsock_disco_recv_pong")
|
|
metricRecvDiscoCallMeMaybe = clientmetric.NewCounter("magicsock_disco_recv_callmemaybe")
|
|
metricRecvDiscoCallMeMaybeBadNode = clientmetric.NewCounter("magicsock_disco_recv_callmemaybe_bad_node")
|
|
metricRecvDiscoCallMeMaybeBadDisco = clientmetric.NewCounter("magicsock_disco_recv_callmemaybe_bad_disco")
|
|
metricRecvDiscoDERPPeerNotHere = clientmetric.NewCounter("magicsock_disco_recv_derp_peer_not_here")
|
|
metricRecvDiscoDERPPeerGoneUnknown = clientmetric.NewCounter("magicsock_disco_recv_derp_peer_gone_unknown")
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// metricDERPHomeChange is how many times our DERP home region DI has
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// changed from non-zero to a different non-zero.
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metricDERPHomeChange = clientmetric.NewCounter("derp_home_change")
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// Disco packets received bpf read path
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metricRecvDiscoPacketIPv4 = clientmetric.NewCounter("magicsock_disco_recv_bpf_ipv4")
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metricRecvDiscoPacketIPv6 = clientmetric.NewCounter("magicsock_disco_recv_bpf_ipv6")
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// metricMaxPeerMTUProbed is the largest peer path MTU we successfully probed.
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metricMaxPeerMTUProbed = clientmetric.NewGauge("magicsock_max_peer_mtu_probed")
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// metricRecvDiscoPeerMTUProbesByMTU collects the number of times we
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// received an peer MTU probe response for a given MTU size.
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// TODO: add proper support for label maps in clientmetrics
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metricRecvDiscoPeerMTUProbesByMTU syncs.Map[string, *clientmetric.Metric]
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|
)
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func getPeerMTUsProbedMetric(mtu tstun.WireMTU) *clientmetric.Metric {
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key := fmt.Sprintf("magicsock_recv_disco_peer_mtu_probes_by_mtu_%d", mtu)
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mm, _ := metricRecvDiscoPeerMTUProbesByMTU.LoadOrInit(key, func() *clientmetric.Metric { return clientmetric.NewCounter(key) })
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return mm
|
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}
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