yggdrasil-network/yggdrasil-go
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Merge pull request #163 from neilalexander/tapmtu

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Cap MTU on Linux in TAP mode
This commit is contained in:
Arceliar 2018-07-19 18:25:03 -05:00 • committed by GitHub
commit 549d6f9dd2
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2 changed files with 16 additions and 0 deletions
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12
src/yggdrasil/tun_linux.go
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@ -29,6 +29,18 @@ func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int)
} }
tun.iface = iface tun.iface = iface
tun.mtu = getSupportedMTU(mtu) tun.mtu = getSupportedMTU(mtu)
// The following check is specific to Linux, as the TAP driver only supports
// an MTU of 65535-14 to make room for the ethernet headers. This makes sure
// that the MTU gets rounded down to 65521 instead of causing a panic.
if iftapmode {
if tun.mtu > 65535-tun_ETHER_HEADER_LENGTH {
tun.mtu = 65535-tun_ETHER_HEADER_LENGTH
}
}
// Friendly output
tun.core.log.Printf("Interface name: %s", tun.iface.Name())
tun.core.log.Printf("Interface IPv6: %s", addr)
tun.core.log.Printf("Interface MTU: %d", tun.mtu)
return tun.setupAddress(addr) return tun.setupAddress(addr)
} }

4
src/yggdrasil/tun_windows.go
View file

@ -57,6 +57,10 @@ func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int)
if err != nil { if err != nil {
panic(err) panic(err)
} }
// Friendly output
tun.core.log.Printf("Interface name: %s", tun.iface.Name())
tun.core.log.Printf("Interface IPv6: %s", addr)
tun.core.log.Printf("Interface MTU: %d", tun.mtu)
return tun.setupAddress(addr) return tun.setupAddress(addr)
} }