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derp: make RunConnectionLoop funcs take Messages, support PeerPresentFlags

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PeerPresentFlags was added in 5ffb2668ef but wasn't plumbed through to
the RunConnectionLoop. Rather than add yet another parameter (as
IP:port was added earlier), pass in the raw PeerPresentMessage and
PeerGoneMessage struct values, which are the same things, plus two
fields: PeerGoneReasonType for gone and the PeerPresentFlags from
5ffb2668ef.

Updates tailscale/corp#17816

Change-Id: Ib19d9f95353651ada90656071fc3656cf58b7987
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2024-06-25 08:04:12 -07:00 committed by Brad Fitzpatrick
parent 7eb8a77ac8
commit 3485e4bf5a
4 changed files with 26 additions and 28 deletions
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6
cmd/derper/mesh.go
View File

@ -9,14 +9,12 @@
"fmt"
"log"
"net"
"net/netip"
"strings"
"time"
"tailscale.com/derp"
"tailscale.com/derp/derphttp"
"tailscale.com/net/netmon"
"tailscale.com/types/key"
"tailscale.com/types/logger"
)
@ -71,8 +69,8 @@ func startMeshWithHost(s *derp.Server, host string) error {
return d.DialContext(ctx, network, addr)
})
add := func(k key.NodePublic, _ netip.AddrPort) { s.AddPacketForwarder(k, c) }
remove := func(k key.NodePublic) { s.RemovePacketForwarder(k, c) }
add := func(m derp.PeerPresentMessage) { s.AddPacketForwarder(m.Key, c) }
remove := func(m derp.PeerGoneMessage) { s.RemovePacketForwarder(m.Peer, c) }
go c.RunWatchConnectionLoop(context.Background(), s.PublicKey(), logf, add, remove)
return nil
}

5
derp/derp.go
View File

@ -131,8 +131,9 @@
type PeerGoneReasonType byte
const (
PeerGoneReasonDisconnected = PeerGoneReasonType(0x00) // peer disconnected from this server
PeerGoneReasonNotHere = PeerGoneReasonType(0x01) // server doesn't know about this peer, unexpected
PeerGoneReasonDisconnected = PeerGoneReasonType(0x00) // peer disconnected from this server
PeerGoneReasonNotHere = PeerGoneReasonType(0x01) // server doesn't know about this peer, unexpected
PeerGoneReasonMeshConnBroke = PeerGoneReasonType(0xf0) // invented by Client.RunWatchConnectionLoop on disconnect; not sent on the wire
)
// PeerPresentFlags is an optional byte of bit flags sent after a framePeerPresent message.

17
derp/derphttp/derphttp_test.go
View File

@ -11,7 +11,6 @@
"net"
"net/http"
"net/http/httptest"
"net/netip"
"sync"
"testing"
"time"
@ -299,13 +298,13 @@ func TestBreakWatcherConnRecv(t *testing.T) {
go func() {
defer wg.Done()
var peers int
add := func(k key.NodePublic, _ netip.AddrPort) {
t.Logf("add: %v", k.ShortString())
add := func(m derp.PeerPresentMessage) {
t.Logf("add: %v", m.Key.ShortString())
peers++
// Signal that the watcher has run
watcherChan <- peers
}
remove := func(k key.NodePublic) { t.Logf("remove: %v", k.ShortString()); peers-- }
remove := func(m derp.PeerGoneMessage) { t.Logf("remove: %v", m.Peer.ShortString()); peers-- }
watcher1.RunWatchConnectionLoop(ctx, serverPrivateKey1.Public(), t.Logf, add, remove)
}()
@ -370,15 +369,15 @@ func TestBreakWatcherConn(t *testing.T) {
go func() {
defer wg.Done()
var peers int
add := func(k key.NodePublic, _ netip.AddrPort) {
t.Logf("add: %v", k.ShortString())
add := func(m derp.PeerPresentMessage) {
t.Logf("add: %v", m.Key.ShortString())
peers++
// Signal that the watcher has run
watcherChan <- peers
// Wait for breaker to run
<-breakerChan
}
remove := func(k key.NodePublic) { t.Logf("remove: %v", k.ShortString()); peers-- }
remove := func(m derp.PeerGoneMessage) { t.Logf("remove: %v", m.Peer.ShortString()); peers-- }
watcher1.RunWatchConnectionLoop(ctx, serverPrivateKey1.Public(), t.Logf, add, remove)
}()
@ -407,8 +406,8 @@ func TestBreakWatcherConn(t *testing.T) {
}
}
func noopAdd(key.NodePublic, netip.AddrPort) {}
func noopRemove(key.NodePublic) {}
func noopAdd(derp.PeerPresentMessage) {}
func noopRemove(derp.PeerGoneMessage) {}
func TestRunWatchConnectionLoopServeConnect(t *testing.T) {
defer func() { testHookWatchLookConnectResult = nil }()

26
derp/derphttp/mesh_client.go
View File

@ -5,7 +5,6 @@
import (
"context"
"net/netip"
"sync"
"time"
@ -35,9 +34,14 @@
// To force RunWatchConnectionLoop to return quickly, its ctx needs to be
// closed, and c itself needs to be closed.
//
// It is a fatal error to call this on an already-started Client withoutq having
// It is a fatal error to call this on an already-started Client without having
// initialized Client.WatchConnectionChanges to true.
func (c *Client) RunWatchConnectionLoop(ctx context.Context, ignoreServerKey key.NodePublic, infoLogf logger.Logf, add func(key.NodePublic, netip.AddrPort), remove func(key.NodePublic)) {
//
// If the DERP connection breaks and reconnects, remove will be called for all
// previously seen peers, with Reason type PeerGoneReasonSynthetic. Those
// clients are likely still connected and their add message will appear after
// reconnect.
func (c *Client) RunWatchConnectionLoop(ctx context.Context, ignoreServerKey key.NodePublic, infoLogf logger.Logf, add func(derp.PeerPresentMessage), remove func(derp.PeerGoneMessage)) {
if !c.WatchConnectionChanges {
if c.isStarted() {
panic("invalid use of RunWatchConnectionLoop on already-started Client without setting Client.RunWatchConnectionLoop")
@ -62,7 +66,7 @@ func (c *Client) RunWatchConnectionLoop(ctx context.Context, ignoreServerKey key
}
logf("reconnected; clearing %d forwarding mappings", len(present))
for k := range present {
remove(k)
remove(derp.PeerGoneMessage{Peer: k, Reason: derp.PeerGoneReasonMeshConnBroke})
}
present = map[key.NodePublic]bool{}
}
@ -84,13 +88,7 @@ func (c *Client) RunWatchConnectionLoop(ctx context.Context, ignoreServerKey key
})
defer timer.Stop()
updatePeer := func(k key.NodePublic, ipPort netip.AddrPort, isPresent bool) {
if isPresent {
add(k, ipPort)
} else {
remove(k)
}
updatePeer := func(k key.NodePublic, isPresent bool) {
mu.Lock()
defer mu.Unlock()
if isPresent {
@ -148,7 +146,8 @@ func (c *Client) RunWatchConnectionLoop(ctx context.Context, ignoreServerKey key
}
switch m := m.(type) {
case derp.PeerPresentMessage:
updatePeer(m.Key, m.IPPort, true)
add(m)
updatePeer(m.Key, true)
case derp.PeerGoneMessage:
switch m.Reason {
case derp.PeerGoneReasonDisconnected:
@ -160,7 +159,8 @@ func (c *Client) RunWatchConnectionLoop(ctx context.Context, ignoreServerKey key
logf("Recv: peer %s not at server %s for unknown reason %v",
key.NodePublic(m.Peer).ShortString(), c.ServerPublicKey().ShortString(), m.Reason)
}
updatePeer(key.NodePublic(m.Peer), netip.AddrPort{}, false)
remove(m)
updatePeer(m.Peer, false)
default:
continue
}