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retarget punch notification messages if needed to deal with being a lighthouse not on the lowest-numbered subnet

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This commit is contained in:
JackDoan
2025-10-17 18:14:29 -05:00
parent 526236c5fa
commit 3b53c27170
1 changed files with 21 additions and 7 deletions
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28
lighthouse.go
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@@ -1115,20 +1115,34 @@ func (lhh *LightHouseHandler) sendHostPunchNotification(n *NebulaMeta, fromVpnAd
found, ln, err := lhh.lh.queryAndPrepMessage(whereToPunch, func(c *cache) (int, error) {
n = lhh.resetMeta()
n.Type = NebulaMeta_HostPunchNotification
targetHI := lhh.lh.ifce.GetHostInfo(punchNotifDest)
punchNotifDestHI := lhh.lh.ifce.GetHostInfo(punchNotifDest)
var useVersion cert.Version
if targetHI == nil {
if punchNotifDestHI == nil {
useVersion = lhh.lh.ifce.GetCertState().initiatingVersion
} else {
crt := targetHI.GetCert().Certificate
useVersion = crt.Version()
// we can only retarget if we have a hostinfo
newDest, ok := findNetworkUnion(crt.Networks(), fromVpnAddrs)
punchNotifDestCrt := punchNotifDestHI.GetCert().Certificate
useVersion = punchNotifDestCrt.Version()
punchNotifDestNetworks := punchNotifDestCrt.Networks()
//if we (the lighthouse) don't have a network in common with punchNotifDest, try to find one
if !lhh.lh.myVpnNetworksTable.Contains(punchNotifDest) {
newPunchNotifDest, ok := findNetworkUnion(lhh.lh.myVpnNetworks, punchNotifDestHI.vpnAddrs)
if ok {
punchNotifDest = newPunchNotifDest
} else {
if lhh.l.Level >= logrus.DebugLevel {
lhh.l.WithField("to", punchNotifDestNetworks).Debugln("unable to notify host to host, no addresses in common")
}
}
}
newWhereToPunch, ok := findNetworkUnion(punchNotifDestNetworks, fromVpnAddrs)
if ok {
whereToPunch = newDest
whereToPunch = newWhereToPunch
} else {
if lhh.l.Level >= logrus.DebugLevel {
lhh.l.WithField("to", crt.Networks()).Debugln("unable to punch to host, no addresses in common")
lhh.l.WithFields(m{"from": fromVpnAddrs, "to": punchNotifDestNetworks}).Debugln("unable to punch to host, no addresses in common with requestor")
}
}
}