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Avoid dynamic MTU calculations for now 

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2019-01-03 19:24:30 +01:00
parent e2384e143c
commit 150cd119c7
1 changed files with 11 additions and 5 deletions
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16
WireGuard/WireGuardNetworkExtension/PacketTunnelSettingsGenerator.swift
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@ -72,14 +72,20 @@ class PacketTunnelSettingsGenerator {
dnsSettings.matchDomains = [""] // All DNS queries must first go through the tunnel's DNS
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 {
// 0 imples automatic MTU, where we set overhead as 80 bytes, which is the worst case for WireGuard
networkSettings.tunnelOverheadBytes = 80
} else {
networkSettings.mtu = NSNumber(value: mtu)
mtu = 1280
}
networkSettings.mtu = NSNumber(value: mtu)
let (ipv4Routes, ipv6Routes) = routes()
let (ipv4IncludedRoutes, ipv6IncludedRoutes) = includedRoutes()