wgengine/netlog: embed the StableNodeID of the authoring node (#6105)

This allows network messages to be annotated with which node it came from.

Signed-off-by: Joe Tsai <joetsai@digital-static.net>

wgengine/wgcfg/config.go

@@ -9,6 +9,7 @@ import (
 	"net/netip"
 
 	"tailscale.com/logtail"
+	"tailscale.com/tailcfg"
 	"tailscale.com/types/key"
 )
 
@@ -18,6 +19,7 @@ import (
 // It only supports the set of things Tailscale uses.
 type Config struct {
 	Name       string
+	NodeID     tailcfg.StableNodeID
 	PrivateKey key.NodePrivate
 	Addresses  []netip.Prefix
 	MTU        uint16

wgengine/wgcfg/nmcfg/nmcfg.go

@@ -62,6 +62,7 @@ func WGCfg(nm *netmap.NetworkMap, logf logger.Logf, flags netmap.WGConfigFlags,
 
 	// Setup log IDs for data plane audit logging.
 	if nm.SelfNode != nil {
+		cfg.NodeID = nm.SelfNode.StableID
 		canNetworkLog := slices.Contains(nm.SelfNode.Capabilities, tailcfg.CapabilityDataPlaneAuditLogs)
 		if canNetworkLog && nm.SelfNode.DataPlaneAuditLogID != "" && nm.DomainAuditLogID != "" {
 			nodeID, errNode := logtail.ParsePrivateID(nm.SelfNode.DataPlaneAuditLogID)

wgengine/wgcfg/wgcfg_clone.go

@@ -10,6 +10,7 @@ import (
 	"net/netip"
 
 	"tailscale.com/logtail"
+	"tailscale.com/tailcfg"
 	"tailscale.com/types/key"
 )
 
@@ -33,6 +34,7 @@ func (src *Config) Clone() *Config {
 // A compilation failure here means this code must be regenerated, with the command at the top of this file.
 var _ConfigCloneNeedsRegeneration = Config(struct {
 	Name           string
+	NodeID         tailcfg.StableNodeID
 	PrivateKey     key.NodePrivate
 	Addresses      []netip.Prefix
 	MTU            uint16