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Avoid dynamic MTU calculations for now

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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
2019-01-07 19:23:39 -05:00
parent e2384e143c
commit 150cd119c7
1 changed files with 11 additions and 5 deletions
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WireGuard/WireGuardNetworkExtension/PacketTunnelSettingsGenerator.swift
+11 -5
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@@ -72,14 +72,20 @@ class PacketTunnelSettingsGenerator {
dnsSettings.matchDomains = [""] // All DNS queries must first go through the tunnel's DNS dnsSettings.matchDomains = [""] // All DNS queries must first go through the tunnel's DNS
networkSettings.dnsSettings = dnsSettings networkSettings.dnsSettings = dnsSettings
let mtu = tunnelConfiguration.interface.mtu ?? 0 var mtu = tunnelConfiguration.interface.mtu ?? 0
/* 0 means automatic MTU. In theory, we should just do
* `networkSettings.tunnelOverheadBytes = 80` but in
* practice there are too many broken networks out there.
* Instead set it to 1280. Boohoo. Maybe someday we'll
* add a nob, maybe, or iOS will do probing for us.
*/
if mtu == 0 { if mtu == 0 {
// 0 imples automatic MTU, where we set overhead as 80 bytes, which is the worst case for WireGuard mtu = 1280
networkSettings.tunnelOverheadBytes = 80
} else {
networkSettings.mtu = NSNumber(value: mtu)
} }
networkSettings.mtu = NSNumber(value: mtu)
let (ipv4Routes, ipv6Routes) = routes() let (ipv4Routes, ipv6Routes) = routes()
let (ipv4IncludedRoutes, ipv6IncludedRoutes) = includedRoutes() let (ipv4IncludedRoutes, ipv6IncludedRoutes) = includedRoutes()