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wgengine/wgcfg,wgengine,ipn/ipnlocal: remove Peers from wgcfg.Config

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The wireguard-go device now learns its peer set solely from the live
per-peer config source that LocalBackend installs with
Engine.SetPeerConfigFunc, backed by the route manager. Peers are
created lazily on first packet and converged per peer with
Engine.SyncDevicePeer, so the full-peer-list snapshot in wgcfg.Config
and the diff-and-reconfigure machinery around it (wgcfg.Peer,
ReconfigDevice, and the engine's full device sync in
maybeReconfigWireguardLocked) are dead weight: they duplicated state
that the route manager already owns and forced every netmap change to
rebuild and rehash the entire peer list.

Delete the Peers field and the Peer type from wgcfg, along with
ReconfigDevice and maybeReconfigWireguardLocked. Engine.Reconfig no
longer does any device peer work; it only manages the private key,
addresses, and the non-peer subsystems. Full-netmap application converges the device by
syncing exactly the peers whose routes the route manager reports as
changed or removed.

Updates #12542

Change-Id: Ic776e42cfaa5be6b9329b3d381d5cbde17d7078b
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2026-07-14 19:57:59 -04:00
committed by Brad Fitzpatrick
parent 87c0d36942
commit 72ca0cae4b
17 changed files with 227 additions and 477 deletions
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wgengine/wgcfg/nmcfg/nmcfg.go
+6 -13
View File
@@ -45,11 +45,16 @@ func cidrIsSubnet(node tailcfg.NodeView, cidr netip.Prefix) bool {
}
// WGCfg returns the NetworkMaps's WireGuard configuration.
//
// The config does not include peers; wireguard-go gets those from the
// live per-peer config source installed via
// [tailscale.com/wgengine.Engine.SetPeerConfigFunc], fed by the route
// manager. WGCfg still walks the peers to log which ones are not
// routable and why, mirroring the route manager's filtering.
func WGCfg(pk key.NodePrivate, nm *netmap.NetworkMap, logf logger.Logf, flags netmap.WGConfigFlags, exitNode tailcfg.StableNodeID) (*wgcfg.Config, error) {
cfg := &wgcfg.Config{
PrivateKey: pk,
Addresses: nm.GetAddresses().AsSlice(),
Peers: make([]wgcfg.Peer, 0, len(nm.Peers)),
}
var skippedExitNode, skippedSubnetRouter, skippedExpired []tailcfg.NodeView
@@ -69,16 +74,7 @@ func WGCfg(pk key.NodePrivate, nm *netmap.NetworkMap, logf logger.Logf, flags ne
continue
}
cfg.Peers = append(cfg.Peers, wgcfg.Peer{
PublicKey: peer.Key(),
DiscoKey: peer.DiscoKey(),
})
cpeer := &cfg.Peers[len(cfg.Peers)-1]
didExitNodeLog := false
cpeer.V4MasqAddr = peer.SelfNodeV4MasqAddrForThisPeer().Clone()
cpeer.V6MasqAddr = peer.SelfNodeV6MasqAddrForThisPeer().Clone()
cpeer.IsJailed = peer.IsJailed()
for _, allowedIP := range peer.AllowedIPs().All() {
if allowedIP.Bits() == 0 && peer.StableID() != exitNode {
if didExitNodeLog {
@@ -87,14 +83,11 @@ func WGCfg(pk key.NodePrivate, nm *netmap.NetworkMap, logf logger.Logf, flags ne
}
didExitNodeLog = true
skippedExitNode = append(skippedExitNode, peer)
continue
} else if cidrIsSubnet(peer, allowedIP) {
if (flags & netmap.AllowSubnetRoutes) == 0 {
skippedSubnetRouter = append(skippedSubnetRouter, peer)
continue
}
}
cpeer.AllowedIPs = append(cpeer.AllowedIPs, allowedIP)
}
}