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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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14
wgengine/monitor/monitor_linux.go
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@@ -20,7 +20,7 @@ import (
"tailscale.com/types/logger"
)
var debugNetlinkMessages = envknob.Bool("TS_DEBUG_NETLINK")
var debugNetlinkMessages = envknob.RegisterBool("TS_DEBUG_NETLINK")
// unspecifiedMessage is a minimal message implementation that should not
// be ignored. In general, OS-specific implementations should use better
@@ -96,7 +96,7 @@ func (c *nlConn) Receive() (message, error) {
nip := netaddrIP(rmsg.Attributes.Address)
if debugNetlinkMessages {
if debugNetlinkMessages() {
typ := "RTM_NEWADDR"
if msg.Header.Type == unix.RTM_DELADDR {
typ = "RTM_DELADDR"
@@ -125,7 +125,7 @@ func (c *nlConn) Receive() (message, error) {
}
if addrs[nip] {
if debugNetlinkMessages {
if debugNetlinkMessages() {
c.logf("ignored duplicate RTM_NEWADDR for %s", nip)
}
return ignoreMessage{}, nil
@@ -147,7 +147,7 @@ func (c *nlConn) Receive() (message, error) {
Addr: nip,
Delete: msg.Header.Type == unix.RTM_DELADDR,
}
if debugNetlinkMessages {
if debugNetlinkMessages() {
c.logf("%+v", nam)
}
return nam, nil
@@ -169,7 +169,7 @@ func (c *nlConn) Receive() (message, error) {
(rmsg.Attributes.Table == 255 || rmsg.Attributes.Table == 254) &&
(dst.Addr().IsMulticast() || dst.Addr().IsLinkLocalUnicast()) {
if debugNetlinkMessages {
if debugNetlinkMessages() {
c.logf("%s ignored", typeStr)
}
@@ -202,7 +202,7 @@ func (c *nlConn) Receive() (message, error) {
Dst: dst,
Gateway: gw,
}
if debugNetlinkMessages {
if debugNetlinkMessages() {
c.logf("%+v", nrm)
}
return nrm, nil
@@ -225,7 +225,7 @@ func (c *nlConn) Receive() (message, error) {
table: rmsg.Table,
priority: rmsg.Attributes.Priority,
}
if debugNetlinkMessages {
if debugNetlinkMessages() {
c.logf("%+v", rdm)
}
return rdm, nil