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envknob: support changing envknobs post-init

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Updates #5114

Change-Id: Ia423fc7486e1b3f3180a26308278be0086fae49b
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-09-14 12:49:39 -07:00
committed by Brad Fitzpatrick
parent 33ee2c058e
commit 74674b110d
31 changed files with 311 additions and 167 deletions
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18
wgengine/netstack/netstack.go
View File

@ -55,7 +55,7 @@ import (
const debugPackets = false
var debugNetstack = envknob.Bool("TS_DEBUG_NETSTACK")
var debugNetstack = envknob.RegisterBool("TS_DEBUG_NETSTACK")
var (
magicDNSIP = tsaddr.TailscaleServiceIP()
@ -638,7 +638,7 @@ func (ns *Impl) userPing(dstIP netip.Addr, pingResPkt []byte) {
}
return
}
if debugNetstack {
if debugNetstack() {
ns.logf("exec pinged %v in %v", dstIP, time.Since(t0))
}
if err := ns.tundev.InjectOutbound(pingResPkt); err != nil {
@ -718,7 +718,7 @@ func netaddrIPFromNetstackIP(s tcpip.Address) netip.Addr {
func (ns *Impl) acceptTCP(r *tcp.ForwarderRequest) {
reqDetails := r.ID()
if debugNetstack {
if debugNetstack() {
ns.logf("[v2] TCP ForwarderRequest: %s", stringifyTEI(reqDetails))
}
clientRemoteIP := netaddrIPFromNetstackIP(reqDetails.RemoteAddress)
@ -849,7 +849,7 @@ func (ns *Impl) acceptTCP(r *tcp.ForwarderRequest) {
func (ns *Impl) forwardTCP(getClient func() *gonet.TCPConn, clientRemoteIP netip.Addr, wq *waiter.Queue, dialAddr netip.AddrPort) (handled bool) {
dialAddrStr := dialAddr.String()
if debugNetstack {
if debugNetstack() {
ns.logf("[v2] netstack: forwarding incoming connection to %s", dialAddrStr)
}
@ -866,7 +866,7 @@ func (ns *Impl) forwardTCP(getClient func() *gonet.TCPConn, clientRemoteIP netip
go func() {
select {
case <-notifyCh:
if debugNetstack {
if debugNetstack() {
ns.logf("[v2] netstack: forwardTCP notifyCh fired; canceling context for %s", dialAddrStr)
}
case <-done:
@ -919,7 +919,7 @@ func (ns *Impl) forwardTCP(getClient func() *gonet.TCPConn, clientRemoteIP netip
func (ns *Impl) acceptUDP(r *udp.ForwarderRequest) {
sess := r.ID()
if debugNetstack {
if debugNetstack() {
ns.logf("[v2] UDP ForwarderRequest: %v", stringifyTEI(sess))
}
var wq waiter.Queue
@ -995,7 +995,7 @@ func (ns *Impl) handleMagicDNSUDP(srcAddr netip.AddrPort, c *gonet.UDPConn) {
// proxy to it directly.
func (ns *Impl) forwardUDP(client *gonet.UDPConn, wq *waiter.Queue, clientAddr, dstAddr netip.AddrPort) {
port, srcPort := dstAddr.Port(), clientAddr.Port()
if debugNetstack {
if debugNetstack() {
ns.logf("[v2] netstack: forwarding incoming UDP connection on port %v", port)
}
@ -1071,7 +1071,7 @@ func (ns *Impl) forwardUDP(client *gonet.UDPConn, wq *waiter.Queue, clientAddr,
}
func startPacketCopy(ctx context.Context, cancel context.CancelFunc, dst net.PacketConn, dstAddr net.Addr, src net.PacketConn, logf logger.Logf, extend func()) {
if debugNetstack {
if debugNetstack() {
logf("[v2] netstack: startPacketCopy to %v (%T) from %T", dstAddr, dst, src)
}
go func() {
@ -1096,7 +1096,7 @@ func startPacketCopy(ctx context.Context, cancel context.CancelFunc, dst net.Pac
}
return
}
if debugNetstack {
if debugNetstack() {
logf("[v2] wrote UDP packet %s -> %s", srcAddr, dstAddr)
}
extend()