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ipnlocal,proxymap,wgengine/netstack: add optional WhoIs/proxymap debug

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Updates tailscale/corp#20600

Change-Id: I2bb17af0f40603ada1ba4cecc087443e00f9392a
Co-authored-by: Maisem Ali <maisem@tailscale.com>
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-09-10 14:10:13 -07:00
committed by Brad Fitzpatrick
parent 7d16af8d95
commit 9f9470fc10
3 changed files with 68 additions and 30 deletions
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18
ipn/ipnlocal/local.go
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@@ -1139,6 +1139,8 @@ func (b *LocalBackend) WhoIsNodeKey(k key.NodePublic) (n tailcfg.NodeView, u tai
return n, u, false
}
var debugWhoIs = envknob.RegisterBool("TS_DEBUG_WHOIS")
// WhoIs reports the node and user who owns the node with the given IP:port.
// If the IP address is a Tailscale IP, the provided port may be 0.
//
@@ -1154,6 +1156,14 @@ func (b *LocalBackend) WhoIs(proto string, ipp netip.AddrPort) (n tailcfg.NodeVi
b.mu.Lock()
defer b.mu.Unlock()
failf := func(format string, args ...any) (tailcfg.NodeView, tailcfg.UserProfile, bool) {
if debugWhoIs() {
args = append([]any{proto, ipp}, args...)
b.logf("whois(%q, %v) :"+format, args...)
}
return zero, u, false
}
nid, ok := b.nodeByAddr[ipp.Addr()]
if !ok {
var ip netip.Addr
@@ -1174,15 +1184,15 @@ func (b *LocalBackend) WhoIs(proto string, ipp netip.AddrPort) (n tailcfg.NodeVi
}
}
if !ok {
return zero, u, false
return failf("no IP found in ProxyMapper for %v", ipp)
}
nid, ok = b.nodeByAddr[ip]
if !ok {
return zero, u, false
return failf("no node for proxymapped IP %v", ip)
}
}
if b.netMap == nil {
return zero, u, false
return failf("no netmap")
}
n, ok = b.peers[nid]
if !ok {
@@ -1194,7 +1204,7 @@ func (b *LocalBackend) WhoIs(proto string, ipp netip.AddrPort) (n tailcfg.NodeVi
}
u, ok = b.netMap.UserProfiles[n.User()]
if !ok {
return zero, u, false
return failf("no userprofile for node %v", n.Key())
}
return n, u, true
}