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android: push default gateway IP from LinkProperties to go backend #794

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Merged
kari-ts merged 1 commit into from
Jun 1, 2026
Merged

android: push default gateway IP from LinkProperties to go backend #794

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8 changes: 8 additions & 0 deletions android/src/main/java/com/tailscale/ipn/NetworkChangeCallback.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -197,6 +197,14 @@ object NetworkChangeCallback {

if (dns.updateDNSFromNetwork(sb.toString())) {
TSLog.d(TAG, "$why: updated DNS config for iface=${info.linkProps.interfaceName}")

val gatewayIP =
info.linkProps.routes
.filter { it.isDefaultRoute && it.gateway != null }
.sortedBy { if (it.gateway is java.net.Inet4Address) 0 else 1 }
.firstNotNullOfOrNull { it.gateway?.hostAddress } ?: ""

Libtailscale.onGatewayChanged(gatewayIP)
Libtailscale.onDNSConfigChanged(info.linkProps.interfaceName)
}
}
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7 changes: 7 additions & 0 deletions libtailscale/callbacks.go
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Expand Up @@ -5,6 +5,8 @@ package libtailscale

import (
"sync"

"tailscale.com/net/netmon"
)

var (
Expand Down Expand Up @@ -36,6 +38,11 @@ func OnDNSConfigChanged(ifname string) {
}
}

// OnGatewayChanged is called when LinkProperties provides an updated default gateway IP.
func OnGatewayChanged(gatewayIP string) {
netmon.UpdateLastKnownDefaultGateway(gatewayIP)
}

var android struct {
// mu protects all fields of this structure. However, once a
// non-nil jvm is returned from javaVM, all the other fields may
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