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Fix up fallback ip rules

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This commit is contained in:
Mygod
2020-10-02 07:42:03 +08:00
parent d7b38c0933
commit 567d1cd9d0
1 changed files with 9 additions and 10 deletions
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19
mobile/src/main/java/be/mygod/vpnhotspot/net/Routing.kt
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@@ -46,6 +46,7 @@ class Routing(private val caller: Any, private val downstream: String) : IpNeigh
private const val RULE_PRIORITY_UPSTREAM = 17800
private const val RULE_PRIORITY_UPSTREAM_FALLBACK = 17900
private const val RULE_PRIORITY_UPSTREAM_DISABLE_SYSTEM = 17980
private const val RULE_PRIORITY_TETHERING = 18000
private const val ROOT_DIR = "/system/bin/"
const val IP = "${ROOT_DIR}ip"
@@ -153,22 +154,24 @@ class Routing(private val caller: Any, private val downstream: String) : IpNeigh
/**
* The only case when upstream is null is on API 23- and we are using system default rules.
*/
inner class Subrouting(priority: Int, val upstream: String? = null) {
val ifindex = if (upstream == null) 0 else if_nametoindex(upstream).also {
inner class Subrouting(priority: Int, val upstream: String) {
val ifindex = if (upstream.isEmpty()) 0 else if_nametoindex(upstream).also {
if (it <= 0) throw IOException("Interface $upstream not found")
}
val transaction = RootSession.beginTransaction().safeguard {
if (upstream != null) ipRuleLookup(ifindex, priority)
if (upstream.isEmpty()) {
ipRule("goto $RULE_PRIORITY_TETHERING", priority) // skip unreachable rule
} else ipRuleLookup(ifindex, priority)
@TargetApi(28) when (masqueradeMode) {
MasqueradeMode.None -> { } // nothing to be done here
MasqueradeMode.Simple -> {
// note: specifying -i wouldn't work for POSTROUTING
iptablesAdd(if (upstream == null) {
iptablesAdd(if (upstream.isEmpty()) {
"vpnhotspot_masquerade -s $hostSubnet -j MASQUERADE"
} else "vpnhotspot_masquerade -s $hostSubnet -o $upstream -j MASQUERADE", "nat")
}
MasqueradeMode.Netd -> {
check(upstream != null) // fallback is only needed for repeater on API 23 < 28
check(upstream.isNotEmpty()) // fallback is only needed for repeater on API 23 < 28
/**
* 0 means that there are no interface addresses coming after, which is unused anyway.
*
@@ -230,7 +233,6 @@ class Routing(private val caller: Any, private val downstream: String) : IpNeigh
})
}
private val upstream = Upstream(RULE_PRIORITY_UPSTREAM)
private var disableSystem: RootSession.Transaction? = null
private inner class Client(private val ip: Inet4Address, mac: MacAddressCompat) : AutoCloseable {
private val transaction = RootSession.beginTransaction().safeguard {
@@ -364,12 +366,10 @@ class Routing(private val caller: Any, private val downstream: String) : IpNeigh
}
fun commit() {
transaction.ipRule("unreachable", RULE_PRIORITY_UPSTREAM_DISABLE_SYSTEM)
transaction.commit()
Timber.i("Started routing for $downstream by $caller")
FallbackUpstreamMonitor.registerCallback(fallbackUpstream)
if (fallbackUpstream.fallbackInactive) disableSystem = RootSession.beginTransaction().safeguard {
ipRule("unreachable", RULE_PRIORITY_UPSTREAM_DISABLE_SYSTEM)
}
UpstreamMonitor.registerCallback(upstream)
IpNeighbourMonitor.registerCallback(this, true)
}
@@ -378,7 +378,6 @@ class Routing(private val caller: Any, private val downstream: String) : IpNeigh
TrafficRecorder.update() // record stats before exiting to prevent stats losing
synchronized(this) { clients.values.forEach { it.close() } }
currentDns?.transaction?.revert()
disableSystem?.revert()
fallbackUpstream.subrouting.values.forEach { it.transaction.revert() }
upstream.subrouting.values.forEach { it.transaction.revert() }
transaction.revert()