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wgengine/{monitor,router}: restore Linux ip rules when systemd deletes them

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Thanks.

Fixes #1591

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-07-20 14:10:52 -07:00
committed by Brad Fitzpatrick
parent 0aa77ba80f
commit e4fecfe31d
4 changed files with 125 additions and 7 deletions
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9
wgengine/monitor/monitor_linux.go
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@@ -134,7 +134,10 @@ func (c *nlConn) Receive() (message, error) {
// On `ip -4 rule del pref 5210 table main`, logs:
// monitor: ip rule deleted: {Family:2 DstLength:0 SrcLength:0 Tos:0 Table:254 Protocol:0 Scope:0 Type:1 Flags:0 Attributes:{Dst:<nil> Src:<nil> Gateway:<nil> OutIface:0 Priority:5210 Table:254 Mark:4294967295 Expires:<nil> Metrics:<nil> Multipath:[]}}
}
return ipRuleDeletedMessage{}, nil
return ipRuleDeletedMessage{
table: rmsg.Table,
priority: rmsg.Attributes.Priority,
}, nil
default:
c.logf("unhandled netlink msg type %+v, %q", msg.Header, msg.Data)
return unspecifiedMessage{}, nil
@@ -192,7 +195,3 @@ func (m *newAddrMessage) ignore() bool {
type ignoreMessage struct{}
func (ignoreMessage) ignore() bool { return true }
type ipRuleDeletedMessage struct{}
func (ipRuleDeletedMessage) ignore() bool { return false }