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net/packet, wgengine, tstun: add inter-node TSMP protocol for connect errors

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This adds a new IP Protocol type, TSMP on protocol number 99 for
sending inter-tailscale messages over WireGuard, currently just for
why a peer rejects TCP SYNs (ACL rejection, shields up, and in the
future: nothing listening, something listening on that port but wrong
interface, etc)

Updates #1094
Updates tailscale/corp#1185

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-01-12 12:03:41 -08:00
committed by Brad Fitzpatrick
parent 01e8b7fb7e
commit b560386c1a
10 changed files with 362 additions and 41 deletions
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3
ipn/local.go
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@@ -564,8 +564,7 @@ func (b *LocalBackend) updateFilter(netMap *controlclient.NetworkMap, prefs *Pre
if shieldsUp {
b.logf("netmap packet filter: (shields up)")
var prevFilter *filter.Filter // don't reuse old filter state
b.e.SetFilter(filter.New(nil, localNets, prevFilter, b.logf))
b.e.SetFilter(filter.NewShieldsUpFilter(b.logf))
} else {
b.logf("netmap packet filter: %v", packetFilter)
b.e.SetFilter(filter.New(packetFilter, localNets, b.e.GetFilter(), b.logf))