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wgengine/monitor: Linux fall back to polling

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Google Cloud Run does not implement NETLINK_ROUTE RTMGRP.
If initialization of the netlink socket or group membership
fails, fall back to a polling implementation.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
This commit is contained in:
Denton Gentry
2021-03-31 16:26:11 -07:00
committed by Denton Gentry
parent 90f82b6946
commit 35ab4020c7
3 changed files with 73 additions and 55 deletions
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7
wgengine/monitor/monitor_linux.go
View File

@@ -7,7 +7,6 @@
package monitor
import (
"fmt"
"net"
"time"
@@ -37,7 +36,7 @@ type nlConn struct {
buffered []netlink.Message
}
func newOSMon(logf logger.Logf, _ *Mon) (osMon, error) {
func newOSMon(logf logger.Logf, m *Mon) (osMon, error) {
conn, err := netlink.Dial(unix.NETLINK_ROUTE, &netlink.Config{
// Routes get us most of the events of interest, but we need
// address as well to cover things like DHCP deciding to give
@@ -46,7 +45,9 @@ func newOSMon(logf logger.Logf, _ *Mon) (osMon, error) {
Groups: unix.RTMGRP_IPV4_IFADDR | unix.RTMGRP_IPV6_IFADDR | unix.RTMGRP_IPV4_ROUTE | unix.RTMGRP_IPV6_ROUTE,
})
if err != nil {
return nil, fmt.Errorf("dialing netlink socket: %v", err)
// Google Cloud Run does not implement NETLINK_ROUTE RTMGRP support
logf("monitor_linux: AF_NETLINK RTMGRP failed, falling back to polling")
return newPollingMon(logf, m)
}
return &nlConn{logf: logf, conn: conn}, nil
}