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ip_openbsd.go
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ip_openbsd.go
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// {{{ Copyright (c) Paul R. Tagliamonte <paul@k3xec.com>, 2022
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE. }}}
//go:build openbsd
package tap
import (
"net"
"syscall"
"unsafe"
"golang.org/x/sys/unix"
)
func (i Interface) AddAddr(ip net.IP, network *net.IPNet) error {
// netintro(4) - SIOCAIFADDR
network.IP = ip
if ip4 := ip.To4(); len(ip4) == net.IPv4len {
return i.addAddrIPv4(ip, network)
}
return i.addAddrIPv6(ip, network)
}
// IPv4 Address Support
type ifaliasreqIPv4 struct {
Name [syscall.IFNAMSIZ]byte
Addr unix.RawSockaddrInet4
Broadcast unix.RawSockaddrInet4
Mask unix.RawSockaddrInet4
}
func rawSockaddrInet4(ip net.IP) unix.RawSockaddrInet4 {
var ret unix.RawSockaddrInet4
ret.Family = unix.AF_INET
ret.Len = unix.SizeofSockaddrInet4
copy(ret.Addr[:], ip.To4())
return ret
}
func rawSockaddrDatalink(hw net.HardwareAddr) unix.RawSockaddrDatalink {
var ret unix.RawSockaddrDatalink
ret.Len = unix.SizeofSockaddrDatalink
ret.Family = unix.AF_LINK
ret.Type = unix.IFT_ETHER
ret.Nlen = 0 // "name length"; interface name []byte, no trailing \0
ret.Alen = 6 // "address length"; MAC address
ret.Slen = 0 // selector length, usually 0
buf := (*[24]byte)(unsafe.Pointer(&(ret.Data[0])))
copy(buf[:6], hw)
return ret
}
func (i Interface) addAddrIPv4(ip net.IP, network *net.IPNet) error {
file, err := afInet()
if err != nil {
return err
}
defer file.Close()
var ifar ifaliasreqIPv4
ifar.Name = i.name
ifar.Addr = rawSockaddrInet4(ip)
ifar.Mask = rawSockaddrInet4(net.IP(network.Mask))
return ioctl(syscall.SIOCAIFADDR, file.Fd(),
uintptr(unsafe.Pointer(&ifar)))
}
// IPv6 Address Support
type addrlifetimeIPv6 struct {
Expire int64
Preferred int64
ValidLifetime uint32
PrefixLifetime uint32
}
type ifaliasreqIPv6 struct {
Name [syscall.IFNAMSIZ]byte
Addr unix.RawSockaddrInet6
Broadcast unix.RawSockaddrInet6
Mask unix.RawSockaddrInet6
Flags uint32
Lifetime addrlifetimeIPv6
}
func rawSockaddrInet6(ip net.IP) unix.RawSockaddrInet6 {
var ret unix.RawSockaddrInet6
ret.Len = unix.SizeofSockaddrInet6
ret.Family = unix.AF_INET6
copy(ret.Addr[:], ip.To16())
return ret
}
func (i Interface) addAddrIPv6(ip net.IP, network *net.IPNet) error {
var (
// TODO: in the future use syscall.SIOCAIFADDR_IN6 when that's a thing.
SIOCAIFADDR_IN6 uintptr = 0x8080691a
)
file, err := afInet6()
if err != nil {
return err
}
defer file.Close()
var ifar ifaliasreqIPv6
ifar.Name = i.name
ifar.Addr = rawSockaddrInet6(ip)
ifar.Mask = rawSockaddrInet6(net.IP(network.Mask))
ifar.Lifetime.ValidLifetime = 0xFFFFFFFF
ifar.Lifetime.PrefixLifetime = 0xFFFFFFFF
return ioctl(SIOCAIFADDR_IN6, file.Fd(),
uintptr(unsafe.Pointer(&ifar)))
}
// vim: foldmethod=marker