yggdrasil-network/yggdrasil-go
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Attempt to support NetBSD

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This code actually consolidates a lot of the BSD code together, and even setting the interface MTU with SIOCSIFMTU seems to work fine.

What doesn't work though is setting the interface address using SIOCSIFADDR_IN6, which I attempted to plagiarise from the Darwin code.

As a fallback, ifconfig is used, which solves the problem enough to get it working.
This commit is contained in:
Neil Alexander 2018-03-04 23:47:01 +00:00
parent b30b6022a8
commit 166d25619d
5 changed files with 106 additions and 111 deletions
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46
src/yggdrasil/tun_openbsd.go
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@ -1,13 +1,5 @@
package yggdrasil
import "syscall"
// This is to catch OpenBSD
// TODO: Fix TUN mode for OpenBSD. It turns out that OpenBSD doesn't have a way
// to disable the PI header when in TUN mode, so we need to modify the read/
// writes to handle those first four bytes
func getDefaults() tunDefaultParameters {
return tunDefaultParameters{
maximumIfMTU: 16384,
@ -16,41 +8,3 @@ func getDefaults() tunDefaultParameters {
defaultIfTAPMode: true,
}
}
// Warning! When porting this to other BSDs, the tuninfo struct can appear with
// the fields in a different order, and the consts below might also have
// different values
/*
OpenBSD, net/if_tun.h:
struct tuninfo {
u_int mtu;
u_short type;
u_short flags;
u_int baudrate;
};
*/
type tuninfo struct {
tun_mtu uint32
tun_type uint16
tun_flags uint16
tun_baudrate uint32
}
func (ti *tuninfo) setInfo(tun *tunDevice) {
ti.tun_flags |= syscall.IFF_UP
switch {
case tun.iface.IsTAP():
ti.tun_flags |= syscall.IFF_MULTICAST
ti.tun_flags |= syscall.IFF_BROADCAST
case tun.iface.IsTUN():
ti.tun_flags |= syscall.IFF_POINTOPOINT
}
ti.tun_mtu = uint32(tun.mtu)
}
const TUNSIFINFO = (0x80000000) | ((12 & 0x1fff) << 16) | uint32(byte('t'))<<8 | 91
const TUNGIFINFO = (0x40000000) | ((12 & 0x1fff) << 16) | uint32(byte('t'))<<8 | 92
const SIOCAIFADDR_IN6 = (0x80000000) | ((4 & 0x1fff) << 16) | uint32(byte('i'))<<8 | 27