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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126
src/yggdrasil/tun_bsd.go
View file

@ -1,15 +1,20 @@
// +build openbsd freebsd
// +build openbsd freebsd netbsd
package yggdrasil
import "os"
import "os/exec"
import "unsafe"
import "syscall"
import "strings"
import "strconv"
import "encoding/binary"
import "os/exec"
import "golang.org/x/sys/unix"
import "github.com/yggdrasil-network/water"
const SIOCSIFADDR_IN6 = (0x80000000) | ((288 & 0x1fff) << 16) | uint32(byte('i'))<<8 | 12
type in6_addrlifetime struct {
ia6t_expire float64
ia6t_preferred float64
@ -26,13 +31,43 @@ type sockaddr_in6 struct {
sin6_scope_id uint32
}
type in6_aliasreq struct {
ifra_name [16]byte
ifra_addr sockaddr_in6
ifra_dstaddr sockaddr_in6
ifra_prefixmask sockaddr_in6
ifra_flags uint32
ifra_lifetime in6_addrlifetime
/*
from <netinet6/in6_var.h>
struct in6_ifreq {
277 char ifr_name[IFNAMSIZ];
278 union {
279 struct sockaddr_in6 ifru_addr;
280 struct sockaddr_in6 ifru_dstaddr;
281 int ifru_flags;
282 int ifru_flags6;
283 int ifru_metric;
284 caddr_t ifru_data;
285 struct in6_addrlifetime ifru_lifetime;
286 struct in6_ifstat ifru_stat;
287 struct icmp6_ifstat ifru_icmp6stat;
288 u_int32_t ifru_scope_id[16];
289 } ifr_ifru;
290 };
*/
type in6_ifreq_mtu struct {
ifr_name [syscall.IFNAMSIZ]byte
ifru_mtu int
}
type in6_ifreq_addr struct {
ifr_name [syscall.IFNAMSIZ]byte
ifru_addr sockaddr_in6
}
type in6_ifreq_flags struct {
ifr_name [syscall.IFNAMSIZ]byte
flags int
}
type in6_ifreq_lifetime struct {
ifr_name [syscall.IFNAMSIZ]byte
ifru_addrlifetime in6_addrlifetime
}
func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int) error {
@ -62,38 +97,67 @@ func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int)
}
func (tun *tunDevice) setupAddress(addr string) error {
fd := tun.iface.ReadWriteCloser.(*os.File).Fd()
var sfd int
var err error
var ti tuninfo
// Create system socket
if sfd, err = unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, 0); err != nil {
tun.core.log.Printf("Create AF_INET socket failed: %v.", err)
return err
}
// Friendly output
tun.core.log.Printf("Interface name: %s", tun.iface.Name())
tun.core.log.Printf("Interface IPv6: %s", addr)
tun.core.log.Printf("Interface MTU: %d", tun.mtu)
// Get the existing interface flags
if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(TUNGIFINFO), uintptr(unsafe.Pointer(&ti))); errno != 0 {
// Create the MTU request
var ir in6_ifreq_mtu
copy(ir.ifr_name[:], tun.iface.Name())
ir.ifru_mtu = int(tun.mtu)
// Set the MTU
if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(sfd), uintptr(syscall.SIOCSIFMTU), uintptr(unsafe.Pointer(&ir))); errno != 0 {
err = errno
tun.core.log.Printf("Error in TUNGIFINFO: %v", errno)
return err
tun.core.log.Printf("Error in SIOCSIFMTU: %v", errno)
// Fall back to ifconfig to set the MTU
cmd := exec.Command("ifconfig", tun.iface.Name(), "mtu", string(tun.mtu))
tun.core.log.Printf("Using ifconfig as fallback: %v", strings.Join(cmd.Args, " "))
output, err := cmd.CombinedOutput()
if err != nil {
tun.core.log.Printf("SIOCSIFMTU fallback failed: %v.", err)
tun.core.log.Println(string(output))
}
}
// Update with any OS-specific flags, MTU, etc.
ti.setInfo(tun)
// Set the new interface flags
if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(TUNSIFINFO), uintptr(unsafe.Pointer(&ti))); errno != 0 {
err = errno
tun.core.log.Printf("Error in TUNSIFINFO: %v", errno)
return err
// Create the address request
// FIXME: I don't work!
var ar in6_ifreq_addr
copy(ar.ifr_name[:], tun.iface.Name())
ar.ifru_addr.sin6_len = uint8(unsafe.Sizeof(ar.ifru_addr))
ar.ifru_addr.sin6_family = unix.AF_INET6
parts := strings.Split(strings.TrimRight(addr, "/8"), ":")
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))
}
// Set address
cmd := exec.Command("ifconfig", tun.iface.Name(), "inet6", addr)
//tun.core.log.Printf("ifconfig command: %v", strings.Join(cmd.Args, " "))
output, err := cmd.CombinedOutput()
if err != nil {
tun.core.log.Printf("ifconfig failed: %v.", err)
tun.core.log.Println(string(output))
// Set the interface address
if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(sfd), uintptr(SIOCSIFADDR_IN6), uintptr(unsafe.Pointer(&ar))); errno != 0 {
err = errno
tun.core.log.Printf("Error in SIOCSIFADDR_IN6: %v", errno)
// Fall back to ifconfig to set the address
cmd := exec.Command("ifconfig", tun.iface.Name(), "inet6", addr)
tun.core.log.Printf("Using ifconfig as fallback: %v", strings.Join(cmd.Args, " "))
output, err := cmd.CombinedOutput()
if err != nil {
tun.core.log.Printf("SIOCSIFADDR_IN6 fallback failed: %v.", err)
tun.core.log.Println(string(output))
}
}
return nil