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PacketTunnelProvider: clamp v6 addresses to /120 

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2018-11-05 03:10:52 +01:00
parent 8ec38e1d2b
commit a08a9ba4c4
1 changed files with 7 additions and 1 deletions
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8
WireGuard/WireGuardNetworkExtension/PacketTunnelProvider.swift
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@ -92,7 +92,13 @@ class PacketTunnelProvider: NEPacketTunnelProvider {
networkSettings.ipv4Settings = ipv4Settings
// IPv6 settings
let ipv6Settings = NEIPv6Settings(addresses: ipv6Addresses, networkPrefixLengths: ipv6NetworkPrefixLengths)
/* Big fat ugly hack for broken iOS networking stack: the smallest prefix that will have
* any effect on iOS is a /120, so we clamp everything above to /120. This is potentially
* very bad, if various network parameters were actually relying on that subnet being
* intentionally small. TODO: talk about this with upstream iOS devs.
*/
let ipv6Settings = NEIPv6Settings(addresses: ipv6Addresses, networkPrefixLengths: ipv6NetworkPrefixLengths.map { NSNumber(value: min(120, $0.intValue)) })
assert(ipv6IncludedRouteAddresses.count == ipv6IncludedRouteNetworkPrefixLengths.count)
ipv6Settings.includedRoutes = zip(ipv6IncludedRouteAddresses, ipv6IncludedRouteNetworkPrefixLengths).map {
NEIPv6Route(destinationAddress: $0.0, networkPrefixLength: $0.1)