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wgengine,ipn,cmd/tailscale: add size option to ping (#8739)

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This adds the capability to pad disco ping message payloads to reach a
specified size. It also plumbs it through to the tailscale ping -size
flag.

Disco pings used for actual endpoint discovery do not use this yet.

Updates #311.

Signed-off-by: salman <salman@tailscale.com>
Co-authored-by: Val <valerie@tailscale.com>
This commit is contained in:
salman aljammaz 2023-08-08 13:11:28 +01:00 committed by GitHub
parent 49896cbdfa
commit 25a7204bb4
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
12 changed files with 125 additions and 30 deletions
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24
client/tailscale/localclient.go
View File

@ -807,11 +807,25 @@ func (lc *LocalClient) ExpandSNIName(ctx context.Context, name string) (fqdn str
return "", false
}
// PingOpts contains options for the ping request.
//
// The zero value is valid, which means to use defaults.
type PingOpts struct {
// Size is the length of the ping message in bytes. It's ignored if it's
// smaller than the minimum message size.
//
// For disco pings, it specifies the length of the packet's payload. That
// is, it includes the disco headers and message, but not the IP and UDP
// headers.
Size int
}
// Ping sends a ping of the provided type to the provided IP and waits
// for its response.
func (lc *LocalClient) Ping(ctx context.Context, ip netip.Addr, pingtype tailcfg.PingType) (*ipnstate.PingResult, error) {
// for its response. The opts type specifies additional options.
func (lc *LocalClient) PingWithOpts(ctx context.Context, ip netip.Addr, pingtype tailcfg.PingType, opts PingOpts) (*ipnstate.PingResult, error) {
v := url.Values{}
v.Set("ip", ip.String())
v.Set("size", strconv.Itoa(opts.Size))
v.Set("type", string(pingtype))
body, err := lc.send(ctx, "POST", "/localapi/v0/ping?"+v.Encode(), 200, nil)
if err != nil {
@ -820,6 +834,12 @@ func (lc *LocalClient) Ping(ctx context.Context, ip netip.Addr, pingtype tailcfg
return decodeJSON[*ipnstate.PingResult](body)
}
// Ping sends a ping of the provided type to the provided IP and waits
// for its response.
func (lc *LocalClient) Ping(ctx context.Context, ip netip.Addr, pingtype tailcfg.PingType) (*ipnstate.PingResult, error) {
return lc.PingWithOpts(ctx, ip, pingtype, PingOpts{})
}
// NetworkLockStatus fetches information about the tailnet key authority, if one is configured.
func (lc *LocalClient) NetworkLockStatus(ctx context.Context) (*ipnstate.NetworkLockStatus, error) {
body, err := lc.send(ctx, "GET", "/localapi/v0/tka/status", 200, nil)

5
cmd/tailscale/cli/ping.go
View File

@ -16,6 +16,7 @@
"time"
"github.com/peterbourgon/ff/v3/ffcli"
"tailscale.com/client/tailscale"
"tailscale.com/ipn/ipnstate"
"tailscale.com/tailcfg"
)
@ -53,12 +54,14 @@
fs.BoolVar(&pingArgs.peerAPI, "peerapi", false, "try hitting the peer's peerapi HTTP server")
fs.IntVar(&pingArgs.num, "c", 10, "max number of pings to send. 0 for infinity.")
fs.DurationVar(&pingArgs.timeout, "timeout", 5*time.Second, "timeout before giving up on a ping")
fs.IntVar(&pingArgs.size, "size", 0, "size of the ping message (disco pings only). 0 for minimum size.")
return fs
})(),
}
var pingArgs struct {
num int
size int
untilDirect bool
verbose bool
tsmp bool
@ -115,7 +118,7 @@ func runPing(ctx context.Context, args []string) error {
for {
n++
ctx, cancel := context.WithTimeout(ctx, pingArgs.timeout)
pr, err := localClient.Ping(ctx, netip.MustParseAddr(ip), pingType())
pr, err := localClient.PingWithOpts(ctx, netip.MustParseAddr(ip), pingType(), tailscale.PingOpts{Size: pingArgs.size})
cancel()
if err != nil {
if errors.Is(err, context.DeadlineExceeded) {

4
control/controlclient/direct.go
View File

@ -171,7 +171,7 @@ type ControlDialPlanner interface {
// Pinger is the LocalBackend.Ping method.
type Pinger interface {
// Ping is a request to do a ping with the peer handling the given IP.
Ping(ctx context.Context, ip netip.Addr, pingType tailcfg.PingType) (*ipnstate.PingResult, error)
Ping(ctx context.Context, ip netip.Addr, pingType tailcfg.PingType, size int) (*ipnstate.PingResult, error)
}
type Decompressor interface {
@ -1671,7 +1671,7 @@ func doPingerPing(logf logger.Logf, c *http.Client, pr *tailcfg.PingRequest, pin
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
res, err := pinger.Ping(ctx, pr.IP, pingType)
res, err := pinger.Ping(ctx, pr.IP, pingType, 0)
if err != nil {
d := time.Since(start).Round(time.Millisecond)
logf("doPingerPing: ping error of type %q to %v after %v: %v", pingType, pr.IP, d, err)

19
disco/disco.go
View File

@ -94,6 +94,9 @@ type Message interface {
AppendMarshal([]byte) []byte
}
// MessageHeaderLen is the length of a message header, 2 bytes for type and version.
const MessageHeaderLen = 2
// appendMsgHeader appends two bytes (for t and ver) and then also
// dataLen bytes to b, returning the appended slice in all. The
// returned data slice is a subslice of all with just dataLen bytes of
@ -117,15 +120,24 @@ type Ping struct {
// netmap data to reduce the discokey:nodekey relation from 1:N to
// 1:1.
NodeKey key.NodePublic
// Padding is the number of 0 bytes at the end of the
// message. (It's used to probe path MTU.)
Padding int
}
// PingLen is the length of a marshalled ping message, without the message
// header or padding.
const PingLen = 12 + key.NodePublicRawLen
func (m *Ping) AppendMarshal(b []byte) []byte {
dataLen := 12
hasKey := !m.NodeKey.IsZero()
if hasKey {
dataLen += key.NodePublicRawLen
}
ret, d := appendMsgHeader(b, TypePing, v0, dataLen)
ret, d := appendMsgHeader(b, TypePing, v0, dataLen+m.Padding)
n := copy(d, m.TxID[:])
if hasKey {
m.NodeKey.AppendTo(d[:n])
@ -138,11 +150,14 @@ func parsePing(ver uint8, p []byte) (m *Ping, err error) {
return nil, errShort
}
m = new(Ping)
m.Padding = len(p)
p = p[copy(m.TxID[:], p):]
m.Padding -= 12
// Deliberately lax on longer-than-expected messages, for future
// compatibility.
if len(p) >= key.NodePublicRawLen {
m.NodeKey = key.NodePublicFromRaw32(mem.B(p[:key.NodePublicRawLen]))
m.Padding -= key.NodePublicRawLen
}
return m, nil
}
@ -214,6 +229,8 @@ type Pong struct {
Src netip.AddrPort // 18 bytes (16+2) on the wire; v4-mapped ipv6 for IPv4
}
// pongLen is the length of a marshalled pong message, without the message
// header or padding.
const pongLen = 12 + 16 + 2
func (m *Pong) AppendMarshal(b []byte) []byte {

17
disco/disco_test.go
View File

@ -35,6 +35,23 @@ func TestMarshalAndParse(t *testing.T) {
},
want: "01 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 00 01 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1e 1f",
},
{
name: "ping_with_padding",
m: &Ping{
TxID: [12]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12},
Padding: 3,
},
want: "01 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 00 00 00",
},
{
name: "ping_with_padding_and_nodekey_src",
m: &Ping{
TxID: [12]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12},
NodeKey: key.NodePublicFromRaw32(mem.B([]byte{1: 1, 2: 2, 30: 30, 31: 31})),
Padding: 3,
},
want: "01 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 00 01 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1e 1f 00 00 00",
},
{
name: "pong",
m: &Pong{

4
ipn/ipnlocal/local.go
View File

@ -2400,7 +2400,7 @@ func (b *LocalBackend) StartLoginInteractive() {
}
}
func (b *LocalBackend) Ping(ctx context.Context, ip netip.Addr, pingType tailcfg.PingType) (*ipnstate.PingResult, error) {
func (b *LocalBackend) Ping(ctx context.Context, ip netip.Addr, pingType tailcfg.PingType, size int) (*ipnstate.PingResult, error) {
if pingType == tailcfg.PingPeerAPI {
t0 := b.clock.Now()
node, base, err := b.pingPeerAPI(ctx, ip)
@ -2423,7 +2423,7 @@ func (b *LocalBackend) Ping(ctx context.Context, ip netip.Addr, pingType tailcfg
return pr, nil
}
ch := make(chan *ipnstate.PingResult, 1)
b.e.Ping(ip, pingType, func(pr *ipnstate.PingResult) {
b.e.Ping(ip, pingType, size, func(pr *ipnstate.PingResult) {
select {
case ch <- pr:
default:

20
ipn/localapi/localapi.go
View File

@ -37,6 +37,7 @@
"tailscale.com/net/netmon"
"tailscale.com/net/netutil"
"tailscale.com/net/portmapper"
"tailscale.com/net/tstun"
"tailscale.com/tailcfg"
"tailscale.com/tka"
"tailscale.com/tstime"
@ -1346,7 +1347,24 @@ func (h *Handler) servePing(w http.ResponseWriter, r *http.Request) {
http.Error(w, "missing 'type' parameter", 400)
return
}
res, err := h.b.Ping(ctx, ip, tailcfg.PingType(pingTypeStr))
size := 0
sizeStr := r.FormValue("size")
if sizeStr != "" {
size, err = strconv.Atoi(sizeStr)
if err != nil {
http.Error(w, "invalid 'size' parameter", 400)
return
}
if size != 0 && tailcfg.PingType(pingTypeStr) != tailcfg.PingDisco {
http.Error(w, "'size' parameter is only supported with disco pings", 400)
return
}
if size > int(tstun.DefaultMTU()) {
http.Error(w, fmt.Sprintf("maximum value for 'size' is %v", tstun.DefaultMTU()), 400)
return
}
}
res, err := h.b.Ping(ctx, ip, tailcfg.PingType(pingTypeStr), size)
if err != nil {
writeErrorJSON(w, err)
return

38
wgengine/magicsock/endpoint.go
View File

@ -19,10 +19,12 @@
"sync/atomic"
"time"
"golang.org/x/crypto/poly1305"
"golang.org/x/exp/maps"
"tailscale.com/disco"
"tailscale.com/ipn/ipnstate"
"tailscale.com/net/stun"
"tailscale.com/net/tstun"
"tailscale.com/tailcfg"
"tailscale.com/tstime/mono"
"tailscale.com/types/key"
@ -361,7 +363,7 @@ func (de *endpoint) heartbeat() {
udpAddr, _, _ := de.addrForSendLocked(now)
if udpAddr.IsValid() {
// We have a preferred path. Ping that every 2 seconds.
de.startDiscoPingLocked(udpAddr, now, pingHeartbeat)
de.startDiscoPingLocked(udpAddr, now, pingHeartbeat, 0)
}
if de.wantFullPingLocked(now) {
@ -403,7 +405,7 @@ func (de *endpoint) noteActiveLocked() {
// cliPing starts a ping for the "tailscale ping" command. res is value to call cb with,
// already partially filled.
func (de *endpoint) cliPing(res *ipnstate.PingResult, cb func(*ipnstate.PingResult)) {
func (de *endpoint) cliPing(res *ipnstate.PingResult, size int, cb func(*ipnstate.PingResult)) {
de.mu.Lock()
defer de.mu.Unlock()
@ -418,17 +420,17 @@ func (de *endpoint) cliPing(res *ipnstate.PingResult, cb func(*ipnstate.PingResu
now := mono.Now()
udpAddr, derpAddr, _ := de.addrForSendLocked(now)
if derpAddr.IsValid() {
de.startDiscoPingLocked(derpAddr, now, pingCLI)
de.startDiscoPingLocked(derpAddr, now, pingCLI, size)
}
if udpAddr.IsValid() && now.Before(de.trustBestAddrUntil) {
// Already have an active session, so just ping the address we're using.
// Otherwise "tailscale ping" results to a node on the local network
// can look like they're bouncing between, say 10.0.0.0/9 and the peer's
// IPv6 address, both 1ms away, and it's random who replies first.
de.startDiscoPingLocked(udpAddr, now, pingCLI)
de.startDiscoPingLocked(udpAddr, now, pingCLI, size)
} else {
for ep := range de.endpointState {
de.startDiscoPingLocked(ep, now, pingCLI)
de.startDiscoPingLocked(ep, now, pingCLI, size)
}
}
de.noteActiveLocked()
@ -522,17 +524,31 @@ func (de *endpoint) removeSentDiscoPingLocked(txid stun.TxID, sp sentPing) {
delete(de.sentPing, txid)
}
// sendDiscoPing sends a ping with the provided txid to ep using de's discoKey.
// discoPingSize is the size of a complete disco ping packet, without any padding.
const discoPingSize = len(disco.Magic) + key.DiscoPublicRawLen + disco.NonceLen +
poly1305.TagSize + disco.MessageHeaderLen + disco.PingLen
// sendDiscoPing sends a ping with the provided txid to ep using de's discoKey. size
// is the desired disco message size, including all disco headers but excluding IP/UDP
// headers.
//
// The caller (startPingLocked) should've already recorded the ping in
// sentPing and set up the timer.
//
// The caller should use de.discoKey as the discoKey argument.
// It is passed in so that sendDiscoPing doesn't need to lock de.mu.
func (de *endpoint) sendDiscoPing(ep netip.AddrPort, discoKey key.DiscoPublic, txid stun.TxID, logLevel discoLogLevel) {
func (de *endpoint) sendDiscoPing(ep netip.AddrPort, discoKey key.DiscoPublic, txid stun.TxID, size int, logLevel discoLogLevel) {
padding := 0
if size > int(tstun.DefaultMTU()) {
size = int(tstun.DefaultMTU())
}
if size-discoPingSize > 0 {
padding = size - discoPingSize
}
sent, _ := de.c.sendDiscoMessage(ep, de.publicKey, discoKey, &disco.Ping{
TxID: [12]byte(txid),
NodeKey: de.c.publicKeyAtomic.Load(),
Padding: padding,
}, logLevel)
if !sent {
de.forgetDiscoPing(txid)
@ -557,7 +573,8 @@ func (de *endpoint) sendDiscoPing(ep netip.AddrPort, discoKey key.DiscoPublic, t
pingCLI
)
func (de *endpoint) startDiscoPingLocked(ep netip.AddrPort, now mono.Time, purpose discoPingPurpose) {
// startDiscoPingLocked sends a disco ping to ep in a separate goroutine.
func (de *endpoint) startDiscoPingLocked(ep netip.AddrPort, now mono.Time, purpose discoPingPurpose, size int) {
if runtime.GOOS == "js" {
return
}
@ -587,9 +604,10 @@ func (de *endpoint) startDiscoPingLocked(ep netip.AddrPort, now mono.Time, purpo
if purpose == pingHeartbeat {
logLevel = discoVerboseLog
}
go de.sendDiscoPing(ep, epDisco.key, txid, logLevel)
go de.sendDiscoPing(ep, epDisco.key, txid, size, logLevel)
}
// sendDiscoPingsLocked starts pinging all of ep's endpoints.
func (de *endpoint) sendDiscoPingsLocked(now mono.Time, sendCallMeMaybe bool) {
de.lastFullPing = now
var sentAny bool
@ -612,7 +630,7 @@ func (de *endpoint) sendDiscoPingsLocked(now mono.Time, sendCallMeMaybe bool) {
de.c.dlogf("[v1] magicsock: disco: send, starting discovery for %v (%v)", de.publicKey.ShortString(), de.discoShort())
}
de.startDiscoPingLocked(ep, now, pingDiscovery)
de.startDiscoPingLocked(ep, now, pingDiscovery, 0)
}
derpAddr := de.derpAddr
if sentAny && sendCallMeMaybe && derpAddr.IsValid() {

8
wgengine/magicsock/magicsock.go
View File

@ -720,7 +720,7 @@ func (c *Conn) LastRecvActivityOfNodeKey(nk key.NodePublic) string {
}
// Ping handles a "tailscale ping" CLI query.
func (c *Conn) Ping(peer *tailcfg.Node, res *ipnstate.PingResult, cb func(*ipnstate.PingResult)) {
func (c *Conn) Ping(peer *tailcfg.Node, res *ipnstate.PingResult, size int, cb func(*ipnstate.PingResult)) {
c.mu.Lock()
defer c.mu.Unlock()
if c.privateKey.IsZero() {
@ -744,7 +744,7 @@ func (c *Conn) Ping(peer *tailcfg.Node, res *ipnstate.PingResult, cb func(*ipnst
cb(res)
return
}
ep.cliPing(res, cb)
ep.cliPing(res, size, cb)
}
// c.mu must be held
@ -1262,7 +1262,7 @@ func (c *Conn) sendDiscoMessage(dst netip.AddrPort, dstKey key.NodePublic, dstDi
if !dstKey.IsZero() {
node = dstKey.ShortString()
}
c.dlogf("[v1] magicsock: disco: %v->%v (%v, %v) sent %v", c.discoShort, dstDisco.ShortString(), node, derpStr(dst.String()), disco.MessageSummary(m))
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)
@ -1330,7 +1330,7 @@ func (c *Conn) handleDiscoMessage(msg []byte, src netip.AddrPort, derpNodeSrc ke
return
}
if debugDisco() {
c.logf("magicsock: disco: got disco-looking frame from %v via %s", sender.ShortString(), via)
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.

4
wgengine/userspace.go
View File

@ -1211,7 +1211,7 @@ func (e *userspaceEngine) UpdateStatus(sb *ipnstate.StatusBuilder) {
e.magicConn.UpdateStatus(sb)
}
func (e *userspaceEngine) Ping(ip netip.Addr, pingType tailcfg.PingType, cb func(*ipnstate.PingResult)) {
func (e *userspaceEngine) Ping(ip netip.Addr, pingType tailcfg.PingType, size int, cb func(*ipnstate.PingResult)) {
res := &ipnstate.PingResult{IP: ip.String()}
pip, ok := e.PeerForIP(ip)
if !ok {
@ -1231,7 +1231,7 @@ func (e *userspaceEngine) Ping(ip netip.Addr, pingType tailcfg.PingType, cb func
e.logf("ping(%v): sending %v ping to %v %v ...", ip, pingType, peer.Key.ShortString(), peer.ComputedName)
switch pingType {
case "disco":
e.magicConn.Ping(peer, res, cb)
e.magicConn.Ping(peer, res, size, cb)
case "TSMP":
e.sendTSMPPing(ip, peer, res, cb)
case "ICMP":

4
wgengine/watchdog.go
View File

@ -158,8 +158,8 @@ func (e *watchdogEngine) DiscoPublicKey() (k key.DiscoPublic) {
e.watchdog("DiscoPublicKey", func() { k = e.wrap.DiscoPublicKey() })
return k
}
func (e *watchdogEngine) Ping(ip netip.Addr, pingType tailcfg.PingType, cb func(*ipnstate.PingResult)) {
e.watchdog("Ping", func() { e.wrap.Ping(ip, pingType, cb) })
func (e *watchdogEngine) Ping(ip netip.Addr, pingType tailcfg.PingType, size int, cb func(*ipnstate.PingResult)) {
e.watchdog("Ping", func() { e.wrap.Ping(ip, pingType, size, cb) })
}
func (e *watchdogEngine) RegisterIPPortIdentity(ipp netip.AddrPort, tsIP netip.Addr) {
e.watchdog("RegisterIPPortIdentity", func() { e.wrap.RegisterIPPortIdentity(ipp, tsIP) })

8
wgengine/wgengine.go
View File

@ -150,9 +150,11 @@ type Engine interface {
// status builder.
UpdateStatus(*ipnstate.StatusBuilder)
// Ping is a request to start a ping with the peer handling the given IP and
// then call cb with its ping latency & method.
Ping(ip netip.Addr, pingType tailcfg.PingType, cb func(*ipnstate.PingResult))
// Ping is a request to start a ping of the given message size to the peer
// handling the given IP, then call cb with its ping latency & method.
//
// If size is zero too small, it is ignored. See tailscale.PingOpts for details.
Ping(ip netip.Addr, pingType tailcfg.PingType, size int, cb func(*ipnstate.PingResult))
// RegisterIPPortIdentity registers a given node (identified by its
// Tailscale IP) as temporarily having the given IP:port for whois lookups.