yggdrasil-network/yggdrasil-go
1
0
Fork 0
mirror of https://github.com/yggdrasil-network/yggdrasil-go.git synced 2025-11-04 11:15:07 +03:00
Code Issues Projects Releases Packages Wiki Activity Actions

Cap MTU on Linux in TAP mode

Browse source
This commit is contained in:
Neil Alexander 2018-07-19 10:01:12 +01:00
parent 1baafdd17d
commit df9cadd938
No known key found for this signature in database
GPG key ID: A02A2019A2BB0944
1 changed files with 8 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

8
src/yggdrasil/tun_linux.go
View file

@ -29,6 +29,14 @@ func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int)
}
tun.iface = iface
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
}
}
return tun.setupAddress(addr)
}