TheArchive/tailscale
1
0
Fork 0
mirror of https://github.com/tailscale/tailscale.git synced 2025-08-14 23:17:29 +00:00
Code Issues Packages Projects Releases Wiki Activity

net/interfaces, net/netns: move default route interface code to interfaces

Browse Source 
To populate interfaces.State.DefaultRouteInterface.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2020-09-22 14:20:01 -07:00
parent fda9dc8815
commit 8893c2ee78
3 changed files with 75 additions and 40 deletions
Download Patch File Download Diff File Expand all files Collapse all files

51
net/netns/netns_windows.go
View File

@@ -14,6 +14,17 @@ import (
"tailscale.com/net/interfaces"
)
func interfaceIndex(iface *winipcfg.Interface) uint32 {
if iface == nil {
// The zero ifidx means "unspecified". If we end up passing zero
// to bindSocket*(), it unsets the binding and lets the socket
// behave as normal again, which is what we want if there's no
// default route we can use.
return 0
}
return iface.Index
}
// control binds c to the Windows interface that holds a default
// route, and is not the Tailscale WinTun interface.
func control(network, address string, c syscall.RawConn) error {
@@ -28,21 +39,21 @@ func control(network, address string, c syscall.RawConn) error {
}
if canV4 {
if4, err := getDefaultInterface(winipcfg.AF_INET)
iface, err := interfaces.GetWindowsDefault(winipcfg.AF_INET)
if err != nil {
return err
}
if err := bindSocket4(c, if4); err != nil {
if err := bindSocket4(c, interfaceIndex(iface)); err != nil {
return err
}
}
if canV6 {
if6, err := getDefaultInterface(winipcfg.AF_INET6)
iface, err := interfaces.GetWindowsDefault(winipcfg.AF_INET6)
if err != nil {
return err
}
if err := bindSocket6(c, if6); err != nil {
if err := bindSocket6(c, interfaceIndex(iface)); err != nil {
return err
}
}
@@ -50,38 +61,6 @@ func control(network, address string, c syscall.RawConn) error {
return nil
}
// getDefaultInterface returns the index of the interface that has the
// non-Tailscale default route for the given address family.
func getDefaultInterface(family winipcfg.AddressFamily) (ifidx uint32, err error) {
ifs, err := interfaces.NonTailscaleMTUs()
if err != nil {
return 0, err
}
routes, err := winipcfg.GetRoutes(family)
if err != nil {
return 0, err
}
bestMetric := ^uint32(0)
// The zero index means "unspecified". If we end up passing zero
// to bindSocket*(), it unsets the binding and lets the socket
// behave as normal again, which is what we want if there's no
// default route we can use.
var index uint32
for _, route := range routes {
if route.DestinationPrefix.PrefixLength != 0 || ifs[route.InterfaceLuid] == 0 {
continue
}
if route.Metric < bestMetric {
bestMetric = route.Metric
index = route.InterfaceIndex
}
}
return index, nil
}
// sockoptBoundInterface is the value of IP_UNICAST_IF and IPV6_UNICAST_IF.
//
// See https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options