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cmd/tta, vnet: add host firewall, env var support, more tests

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In particular, tests showing that #3824 works. But that test doesn't
actually work yet; it only gets a DERP connection. (why?)

Updates #13038

Change-Id: Ie1fd1b6a38d4e90fae7e72a0b9a142a95f0b2e8f
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-08-10 13:46:47 -07:00
committed by Brad Fitzpatrick
parent b692985aef
commit a61825c7b8
9 changed files with 393 additions and 7 deletions
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6
wgengine/magicsock/magicsock_linux.go
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@@ -32,6 +32,9 @@ const (
// Enable/disable using raw sockets to receive disco traffic.
var debugDisableRawDisco = envknob.RegisterBool("TS_DEBUG_DISABLE_RAW_DISCO")
// debugRawDiscoReads enables logging of raw disco reads.
var debugRawDiscoReads = envknob.RegisterBool("TS_DEBUG_RAW_DISCO")
// These are our BPF filters that we use for testing packets.
var (
magicsockFilterV4 = []bpf.Instruction{
@@ -211,6 +214,9 @@ func (c *Conn) receiveDisco(pc net.PacketConn, isIPV6 bool) {
var buf [1500]byte
for {
n, src, err := pc.ReadFrom(buf[:])
if debugRawDiscoReads() {
c.logf("raw disco read from %v = (%v, %v)", src, n, err)
}
if errors.Is(err, net.ErrClosed) {
return
} else if err != nil {