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Clean up legacy fallback rules

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This commit is contained in:
Mygod
2023-03-01 12:28:42 -05:00
parent b380947bc3
commit f10131fcd4
1 changed files with 12 additions and 23 deletions
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35
mobile/src/main/java/be/mygod/vpnhotspot/net/Routing.kt
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@@ -150,35 +150,24 @@ class Routing(private val caller: Any, private val downstream: String) : IpNeigh
private val upstreams = HashSet<String>()
private class InterfaceGoneException(upstream: String) : IOException("Interface $upstream not found")
private open inner class Upstream(val priority: Int) : UpstreamMonitor.Callback {
/**
* 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) {
val ifindex = if (upstream.isEmpty()) 0 else Os.if_nametoindex(upstream).also {
val ifindex = Os.if_nametoindex(upstream).also {
if (it <= 0) throw InterfaceGoneException(upstream)
}
val transaction = RootSession.beginTransaction().safeguard {
if (upstream.isEmpty()) {
ipRule("goto $RULE_PRIORITY_TETHERING", priority) // skip unreachable rule
} else ipRuleLookup(ifindex, priority)
ipRuleLookup(ifindex, priority)
when (masqueradeMode) {
MasqueradeMode.None -> { } // nothing to be done here
MasqueradeMode.Simple -> {
// note: specifying -i wouldn't work for POSTROUTING
iptablesAdd(if (upstream.isEmpty()) {
"vpnhotspot_masquerade -s $hostSubnet -j MASQUERADE"
} else "vpnhotspot_masquerade -s $hostSubnet -o $upstream -j MASQUERADE", "nat")
}
MasqueradeMode.Netd -> {
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.
*
* https://android.googlesource.com/platform/frameworks/base/+/android-5.0.0_r1/services/core/java/com/android/server/NetworkManagementService.java#1251
* https://android.googlesource.com/platform/system/netd/+/android-5.0.0_r1/server/CommandListener.cpp#638
*/
ndc("Nat", "ndc nat enable $downstream $upstream 0")
}
// note: specifying -i wouldn't work for POSTROUTING
MasqueradeMode.Simple -> iptablesAdd(
"vpnhotspot_masquerade -s $hostSubnet -o $upstream -j MASQUERADE", "nat")
/**
* 0 means that there are no interface addresses coming after, which is unused anyway.
*
* https://android.googlesource.com/platform/frameworks/base/+/android-5.0.0_r1/services/core/java/com/android/server/NetworkManagementService.java#1251
* https://android.googlesource.com/platform/system/netd/+/android-5.0.0_r1/server/CommandListener.cpp#638
*/
MasqueradeMode.Netd -> ndc("Nat", "ndc nat enable $downstream $upstream 0")
}
}
}