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tun: OpenBSD: use correct ioctl to set and IPv6 address

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SIOCSIFADDR_IN6 simply does not exist, on no system out there.

SIOCSIFADDR exists, but long ago was deprecated by
SIOCAIFADDR which is IPv4-only, see netintro(4).

SIOCAIFADDR_IN6 is correct, but does uses a different struct,
so bring that in, also.

NB:  The reason we have to handroll ioctl(2) ourselves is because
golang.org/sys/unix does ship IPv6 ioctl and/or struct definitions.

That should really be fixed upstream.
This commit is contained in:
Klemens Nanni 2024-09-29 23:40:01 +03:00
parent 71484f933f
commit fc8b15a909
No known key found for this signature in database
1 changed files with 15 additions and 12 deletions
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27
src/tun/tun_openbsd.go
View file

@ -16,7 +16,7 @@ import (
wgtun "golang.zx2c4.com/wireguard/tun"
)
const SIOCSIFADDR_IN6 = (0x80000000) | ((288 & 0x1fff) << 16) | uint32(byte('i'))<<8 | 12
const SIOCAIFADDR_IN6 = 0x8080691a
type in6_addrlifetime struct {
ia6t_expire int64
@ -34,9 +34,13 @@ type sockaddr_in6 struct {
sin6_scope_id uint32
}
type in6_ifreq_addr struct {
ifr_name [syscall.IFNAMSIZ]byte
ifru_addr sockaddr_in6
type in6_aliasreq struct {
ifra_name [syscall.IFNAMSIZ]byte
ifra_addr sockaddr_in6
ifra_dstaddr sockaddr_in6
ifra_prefixmask sockaddr_in6
ifra_flags int32
ifra_lifetime in6_addrlifetime
}
// Configures the TUN adapter with the correct IPv6 address and MTU.
@ -78,23 +82,22 @@ func (tun *TunAdapter) setupAddress(addr string) error {
tun.log.Infof("Interface MTU: %d", tun.mtu)
// Create the address request
// FIXME: I don't work!
var ar in6_ifreq_addr
copy(ar.ifr_name[:], tun.Name())
ar.ifru_addr.sin6_len = uint8(unsafe.Sizeof(ar.ifru_addr))
ar.ifru_addr.sin6_family = unix.AF_INET6
var ar in6_aliasreq
copy(ar.ifra_name[:], tun.Name())
ar.ifra_addr.sin6_len = uint8(unsafe.Sizeof(ar.ifra_addr))
ar.ifra_addr.sin6_family = unix.AF_INET6
parts := strings.Split(strings.Split(addr, "/")[0], ":")
for i := 0; i < 8; i++ {
addr, _ := strconv.ParseUint(parts[i], 16, 16)
b := make([]byte, 16)
binary.LittleEndian.PutUint16(b, uint16(addr))
ar.ifru_addr.sin6_addr[i] = uint16(binary.BigEndian.Uint16(b))
ar.ifra_addr.sin6_addr[i] = uint16(binary.BigEndian.Uint16(b))
}
// Set the interface address
if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(sfd), uintptr(SIOCSIFADDR_IN6), uintptr(unsafe.Pointer(&ar))); errno != 0 {
if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(sfd), uintptr(SIOCAIFADDR_IN6), uintptr(unsafe.Pointer(&ar))); errno != 0 {
err = errno
tun.log.Errorf("Error in SIOCSIFADDR_IN6: %v", errno)
tun.log.Errorf("Error in SIOCAIFADDR_IN6: %v", errno)
}
return nil