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// Copyright 2021 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package netstack
import (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/syserror"
"gvisor.dev/gvisor/pkg/tcpip/link/tun"
)
// TUNFlagsToLinux converts a tun.Flags to Linux TUN flags.
func TUNFlagsToLinux(flags tun.Flags) uint16 {
ret := uint16(linux.IFF_NOFILTER)
if flags.TAP {
ret |= linux.IFF_TAP
}
if flags.TUN {
ret |= linux.IFF_TUN
}
if flags.NoPacketInfo {
ret |= linux.IFF_NO_PI
}
return ret
}
// LinuxToTUNFlags converts Linux TUN flags to a tun.Flags.
func LinuxToTUNFlags(flags uint16) (tun.Flags, error) {
// Linux adds IFF_NOFILTER (the same value as IFF_NO_PI unfortunately)
// when there is no sk_filter. See __tun_chr_ioctl() in
// net/drivers/tun.c.
if flags&^uint16(linux.IFF_TUN|linux.IFF_TAP|linux.IFF_NO_PI) != 0 {
return tun.Flags{}, syserror.EINVAL
}
return tun.Flags{
TUN: flags&linux.IFF_TUN != 0,
TAP: flags&linux.IFF_TAP != 0,
NoPacketInfo: flags&linux.IFF_NO_PI != 0,
}, nil
}
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