mirror of
https://github.com/yggdrasil-network/yggdrasil-go.git
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Attempt to support NetBSD
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
parent
b30b6022a8
commit
166d25619d
5 changed files with 106 additions and 111 deletions
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@ -1,15 +1,20 @@
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// +build openbsd freebsd
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// +build openbsd freebsd netbsd
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package yggdrasil
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import "os"
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import "os/exec"
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import "unsafe"
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import "syscall"
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import "strings"
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import "strconv"
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import "encoding/binary"
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import "os/exec"
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import "golang.org/x/sys/unix"
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import "github.com/yggdrasil-network/water"
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const SIOCSIFADDR_IN6 = (0x80000000) | ((288 & 0x1fff) << 16) | uint32(byte('i'))<<8 | 12
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type in6_addrlifetime struct {
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ia6t_expire float64
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ia6t_preferred float64
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@ -26,13 +31,43 @@ type sockaddr_in6 struct {
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sin6_scope_id uint32
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}
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type in6_aliasreq struct {
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ifra_name [16]byte
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ifra_addr sockaddr_in6
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ifra_dstaddr sockaddr_in6
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ifra_prefixmask sockaddr_in6
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ifra_flags uint32
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ifra_lifetime in6_addrlifetime
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/*
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from <netinet6/in6_var.h>
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struct in6_ifreq {
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277 char ifr_name[IFNAMSIZ];
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278 union {
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279 struct sockaddr_in6 ifru_addr;
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280 struct sockaddr_in6 ifru_dstaddr;
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281 int ifru_flags;
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282 int ifru_flags6;
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283 int ifru_metric;
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284 caddr_t ifru_data;
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285 struct in6_addrlifetime ifru_lifetime;
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286 struct in6_ifstat ifru_stat;
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287 struct icmp6_ifstat ifru_icmp6stat;
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288 u_int32_t ifru_scope_id[16];
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289 } ifr_ifru;
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290 };
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*/
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type in6_ifreq_mtu struct {
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ifr_name [syscall.IFNAMSIZ]byte
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ifru_mtu int
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}
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type in6_ifreq_addr struct {
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ifr_name [syscall.IFNAMSIZ]byte
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ifru_addr sockaddr_in6
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}
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type in6_ifreq_flags struct {
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ifr_name [syscall.IFNAMSIZ]byte
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flags int
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}
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type in6_ifreq_lifetime struct {
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ifr_name [syscall.IFNAMSIZ]byte
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ifru_addrlifetime in6_addrlifetime
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}
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func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int) error {
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@ -62,38 +97,67 @@ func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int)
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}
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func (tun *tunDevice) setupAddress(addr string) error {
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fd := tun.iface.ReadWriteCloser.(*os.File).Fd()
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var sfd int
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var err error
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var ti tuninfo
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// Create system socket
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if sfd, err = unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, 0); err != nil {
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tun.core.log.Printf("Create AF_INET socket failed: %v.", err)
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return err
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}
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// Friendly output
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tun.core.log.Printf("Interface name: %s", tun.iface.Name())
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tun.core.log.Printf("Interface IPv6: %s", addr)
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tun.core.log.Printf("Interface MTU: %d", tun.mtu)
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// Get the existing interface flags
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if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(TUNGIFINFO), uintptr(unsafe.Pointer(&ti))); errno != 0 {
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// Create the MTU request
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var ir in6_ifreq_mtu
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copy(ir.ifr_name[:], tun.iface.Name())
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ir.ifru_mtu = int(tun.mtu)
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// Set the MTU
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if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(sfd), uintptr(syscall.SIOCSIFMTU), uintptr(unsafe.Pointer(&ir))); errno != 0 {
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err = errno
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tun.core.log.Printf("Error in TUNGIFINFO: %v", errno)
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return err
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tun.core.log.Printf("Error in SIOCSIFMTU: %v", errno)
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// Fall back to ifconfig to set the MTU
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cmd := exec.Command("ifconfig", tun.iface.Name(), "mtu", string(tun.mtu))
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tun.core.log.Printf("Using ifconfig as fallback: %v", strings.Join(cmd.Args, " "))
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output, err := cmd.CombinedOutput()
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if err != nil {
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tun.core.log.Printf("SIOCSIFMTU fallback failed: %v.", err)
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tun.core.log.Println(string(output))
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}
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}
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// Update with any OS-specific flags, MTU, etc.
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ti.setInfo(tun)
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// Set the new interface flags
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if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(TUNSIFINFO), uintptr(unsafe.Pointer(&ti))); errno != 0 {
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err = errno
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tun.core.log.Printf("Error in TUNSIFINFO: %v", errno)
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return err
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// Create the address request
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// FIXME: I don't work!
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var ar in6_ifreq_addr
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copy(ar.ifr_name[:], tun.iface.Name())
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ar.ifru_addr.sin6_len = uint8(unsafe.Sizeof(ar.ifru_addr))
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ar.ifru_addr.sin6_family = unix.AF_INET6
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parts := strings.Split(strings.TrimRight(addr, "/8"), ":")
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for i := 0; i < 8; i++ {
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addr, _ := strconv.ParseUint(parts[i], 16, 16)
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b := make([]byte, 16)
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binary.LittleEndian.PutUint16(b, uint16(addr))
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ar.ifru_addr.sin6_addr[i] = uint16(binary.BigEndian.Uint16(b))
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}
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// Set address
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cmd := exec.Command("ifconfig", tun.iface.Name(), "inet6", addr)
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//tun.core.log.Printf("ifconfig command: %v", strings.Join(cmd.Args, " "))
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output, err := cmd.CombinedOutput()
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if err != nil {
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tun.core.log.Printf("ifconfig failed: %v.", err)
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tun.core.log.Println(string(output))
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// Set the interface address
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if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(sfd), uintptr(SIOCSIFADDR_IN6), uintptr(unsafe.Pointer(&ar))); errno != 0 {
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err = errno
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tun.core.log.Printf("Error in SIOCSIFADDR_IN6: %v", errno)
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// Fall back to ifconfig to set the address
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cmd := exec.Command("ifconfig", tun.iface.Name(), "inet6", addr)
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tun.core.log.Printf("Using ifconfig as fallback: %v", strings.Join(cmd.Args, " "))
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output, err := cmd.CombinedOutput()
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if err != nil {
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tun.core.log.Printf("SIOCSIFADDR_IN6 fallback failed: %v.", err)
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tun.core.log.Println(string(output))
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}
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}
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return nil
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@ -1,7 +1,5 @@
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package yggdrasil
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// This is to catch FreeBSD and NetBSD
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func getDefaults() tunDefaultParameters {
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return tunDefaultParameters{
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maximumIfMTU: 32767,
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@ -10,34 +8,3 @@ func getDefaults() tunDefaultParameters {
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defaultIfTAPMode: true,
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}
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}
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// Warning! When porting this to other BSDs, the tuninfo struct can appear with
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// the fields in a different order, and the consts below might also have
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// different values
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/*
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FreeBSD/NetBSD, net/if_tun.h:
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struct tuninfo {
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int baudrate;
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short mtu;
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u_char type;
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u_char dummy;
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};
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*/
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type tuninfo struct {
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tun_baudrate int32
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tun_mtu int16
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tun_type uint8
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tun_dummy uint8
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}
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func (ti *tuninfo) setInfo(tun *tunDevice) {
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ti.tun_mtu = int16(tun.mtu)
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}
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const TUNSIFINFO = (0x80000000) | ((8 & 0x1fff) << 16) | uint32(byte('t'))<<8 | 91
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const TUNGIFINFO = (0x40000000) | ((8 & 0x1fff) << 16) | uint32(byte('t'))<<8 | 92
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const TUNSIFHEAD = (0x80000000) | ((4 & 0x1fff) << 16) | uint32(byte('t'))<<8 | 96
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const SIOCAIFADDR_IN6 = (0x80000000) | ((4 & 0x1fff) << 16) | uint32(byte('i'))<<8 | 27
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10
src/yggdrasil/tun_netbsd.go
Normal file
10
src/yggdrasil/tun_netbsd.go
Normal file
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@ -0,0 +1,10 @@
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package yggdrasil
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func getDefaults() tunDefaultParameters {
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return tunDefaultParameters{
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maximumIfMTU: 9000,
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defaultIfMTU: 9000,
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defaultIfName: "/dev/tap0",
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defaultIfTAPMode: true,
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}
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}
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@ -1,13 +1,5 @@
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package yggdrasil
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import "syscall"
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// This is to catch OpenBSD
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// TODO: Fix TUN mode for OpenBSD. It turns out that OpenBSD doesn't have a way
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// to disable the PI header when in TUN mode, so we need to modify the read/
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// writes to handle those first four bytes
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func getDefaults() tunDefaultParameters {
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return tunDefaultParameters{
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maximumIfMTU: 16384,
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defaultIfTAPMode: true,
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}
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}
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// Warning! When porting this to other BSDs, the tuninfo struct can appear with
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// the fields in a different order, and the consts below might also have
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// different values
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/*
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OpenBSD, net/if_tun.h:
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struct tuninfo {
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u_int mtu;
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u_short type;
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u_short flags;
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u_int baudrate;
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};
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*/
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type tuninfo struct {
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tun_mtu uint32
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tun_type uint16
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tun_flags uint16
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tun_baudrate uint32
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}
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func (ti *tuninfo) setInfo(tun *tunDevice) {
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ti.tun_flags |= syscall.IFF_UP
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switch {
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case tun.iface.IsTAP():
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ti.tun_flags |= syscall.IFF_MULTICAST
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ti.tun_flags |= syscall.IFF_BROADCAST
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case tun.iface.IsTUN():
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ti.tun_flags |= syscall.IFF_POINTOPOINT
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}
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ti.tun_mtu = uint32(tun.mtu)
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}
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const TUNSIFINFO = (0x80000000) | ((12 & 0x1fff) << 16) | uint32(byte('t'))<<8 | 91
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const TUNGIFINFO = (0x40000000) | ((12 & 0x1fff) << 16) | uint32(byte('t'))<<8 | 92
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const SIOCAIFADDR_IN6 = (0x80000000) | ((4 & 0x1fff) << 16) | uint32(byte('i'))<<8 | 27
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@ -1,4 +1,4 @@
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// +build !linux,!darwin,!windows,!openbsd,!freebsd
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// +build !linux,!darwin,!windows,!openbsd,!freebsd,!netbsd
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package yggdrasil
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