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wgengine/magicsock: move temporary endpoint lookup later, add TODO to remove 

Updates #3088

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2021-10-15 19:22:30 -07:00
parent 36a07089ee
commit e5779f019e
1 changed files with 15 additions and 7 deletions
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22
wgengine/magicsock/magicsock.go
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@ -1772,18 +1772,12 @@ func (c *Conn) handleDiscoMessage(msg []byte, src netaddr.IPPort, derpNodeSrc ke
return
}
ep, ok := c.peerMap.endpointForDiscoKey(sender)
if !ok {
if !c.peerMap.anyEndpointForDiscoKey(sender) {
if debugDisco {
c.logf("magicsock: disco: ignoring disco-looking frame, don't know endpoint for %v", sender.ShortString())
}
return
}
if !ep.canP2P() {
// This endpoint allegedly sent us a disco packet, but we know
// they can't speak disco. Drop.
return
}
// We're now reasonably sure we're expecting communication from
// this peer, do the heavy crypto lifting to see what they want.
@ -1824,6 +1818,20 @@ func (c *Conn) handleDiscoMessage(msg []byte, src netaddr.IPPort, derpNodeSrc ke
return
}
// TODO(bradfitz): remove this endpointForDiscoKey lookup once handlePingLocked
// and handlePongConnLocked are updated to look up the endpoint on their own
// different ways (not by DiscoKey).
ep, ok := c.peerMap.endpointForDiscoKey(sender)
if !ok {
// Shouldn't be possible if anyEndpointForDiscoKey above passed.
return
}
if !ep.canP2P() {
// This endpoint allegedly sent us a disco packet, but we know
// they can't speak disco. Drop.
return
}
switch dm := dm.(type) {
case *disco.Ping:
c.handlePingLocked(dm, ep, src, sender)