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cmd/xdpderper,derp/xdp: implement mode that drops STUN packets (#12527)

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This is useful during maintenance as a method for shedding home client
load.

Updates tailscale/corp#20689

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited
2024-06-18 14:06:00 -07:00
committed by GitHub
parent d55b105dae
commit a93173b56a
9 changed files with 128 additions and 10 deletions
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22
cmd/xdpderper/xdpderper.go
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@@ -5,6 +5,7 @@ package main
import (
"flag"
"io"
"log"
"net/http"
"os"
@@ -57,7 +58,26 @@ func main() {
log.Println("XDP STUN server started")
mux := http.NewServeMux()
tsweb.Debugger(mux)
debug := tsweb.Debugger(mux)
debug.KVFunc("Drop STUN", func() any {
return server.GetDropSTUN()
})
debug.Handle("drop-stun-on", "Drop STUN packets", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
err := server.SetDropSTUN(true)
if err != nil {
http.Error(w, err.Error(), 500)
} else {
io.WriteString(w, "STUN packets are now being dropped.")
}
}))
debug.Handle("drop-stun-off", "Handle STUN packets", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
err := server.SetDropSTUN(false)
if err != nil {
http.Error(w, err.Error(), 500)
} else {
io.WriteString(w, "STUN packets are now being handled.")
}
}))
errCh := make(chan error, 1)
go func() {
err := http.ListenAndServe(*flagHTTP, mux)