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net/netmon: publish events to event bus

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Updates #15160

Signed-off-by: David Anderson <dave@tailscale.com>
This commit is contained in:
David Anderson
2025-03-19 10:47:25 -07:00
committed by M. J. Fromberger
parent 6d6f69e735
commit 5399fa159a
41 changed files with 196 additions and 56 deletions
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38
net/netmon/netmon_linux.go
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@@ -16,6 +16,7 @@ import (
"tailscale.com/envknob"
"tailscale.com/net/tsaddr"
"tailscale.com/types/logger"
"tailscale.com/util/eventbus"
)
var debugNetlinkMessages = envknob.RegisterBool("TS_DEBUG_NETLINK")
@@ -27,15 +28,26 @@ type unspecifiedMessage struct{}
func (unspecifiedMessage) ignore() bool { return false }
// RuleDeleted reports that one of Tailscale's policy routing rules
// was deleted.
type RuleDeleted struct {
// Table is the table number that the deleted rule referenced.
Table uint8
// Priority is the lookup priority of the deleted rule.
Priority uint32
}
// nlConn wraps a *netlink.Conn and returns a monitor.Message
// instead of a netlink.Message. Currently, messages are discarded,
// but down the line, when messages trigger different logic depending
// on the type of event, this provides the capability of handling
// each architecture-specific message in a generic fashion.
type nlConn struct {
logf logger.Logf
conn *netlink.Conn
buffered []netlink.Message
busClient *eventbus.Client
rulesDeleted *eventbus.Publisher[RuleDeleted]
logf logger.Logf
conn *netlink.Conn
buffered []netlink.Message
// addrCache maps interface indices to a set of addresses, and is
// used to suppress duplicate RTM_NEWADDR messages. It is populated
@@ -44,7 +56,7 @@ type nlConn struct {
addrCache map[uint32]map[netip.Addr]bool
}
func newOSMon(logf logger.Logf, m *Monitor) (osMon, error) {
func newOSMon(bus *eventbus.Bus, logf logger.Logf, m *Monitor) (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
@@ -59,12 +71,22 @@ func newOSMon(logf logger.Logf, m *Monitor) (osMon, error) {
logf("monitor_linux: AF_NETLINK RTMGRP failed, falling back to polling")
return newPollingMon(logf, m)
}
return &nlConn{logf: logf, conn: conn, addrCache: make(map[uint32]map[netip.Addr]bool)}, nil
client := bus.Client("netmon-iprules")
return &nlConn{
busClient: client,
rulesDeleted: eventbus.Publish[RuleDeleted](client),
logf: logf,
conn: conn,
addrCache: make(map[uint32]map[netip.Addr]bool),
}, nil
}
func (c *nlConn) IsInterestingInterface(iface string) bool { return true }
func (c *nlConn) Close() error { return c.conn.Close() }
func (c *nlConn) Close() error {
c.busClient.Close()
return c.conn.Close()
}
func (c *nlConn) Receive() (message, error) {
if len(c.buffered) == 0 {
@@ -219,6 +241,10 @@ 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:[]}}
}
c.rulesDeleted.Publish(RuleDeleted{
Table: rmsg.Table,
Priority: rmsg.Attributes.Priority,
})
rdm := ipRuleDeletedMessage{
table: rmsg.Table,
priority: rmsg.Attributes.Priority,