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p2p/nat: handle responses with alternative port in NAT-PMP (#26321)

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Co-authored-by: Felix Lange <fjl@twurst.com>
This commit is contained in:
Seungbae Yu 2022-12-08 00:22:04 +09:00 committed by GitHub
parent f20eba426a
commit 42212808f0
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1 changed files with 16 additions and 2 deletions
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16
p2p/nat/natpmp.go
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@ -50,10 +50,24 @@ func (n *pmp) AddMapping(protocol string, extport, intport int, name string, lif
} }
// Note order of port arguments is switched between our // Note order of port arguments is switched between our
// AddMapping and the client's AddPortMapping. // AddMapping and the client's AddPortMapping.
_, err := n.c.AddPortMapping(strings.ToLower(protocol), intport, extport, int(lifetime/time.Second)) res, err := n.c.AddPortMapping(strings.ToLower(protocol), intport, extport, int(lifetime/time.Second))
if err != nil {
return err return err
} }
// NAT-PMP maps an alternative available port number if the requested
// port is already mapped to another address and returns success. In this
// case, we return an error because there is no way to return the new port
// to the caller.
if uint16(extport) != res.MappedExternalPort {
// Destroy the mapping in NAT device.
n.c.AddPortMapping(strings.ToLower(protocol), intport, 0, 0)
return fmt.Errorf("port %d already mapped to another address (%s)", extport, protocol)
}
return nil
}
func (n *pmp) DeleteMapping(protocol string, extport, intport int) (err error) { func (n *pmp) DeleteMapping(protocol string, extport, intport int) (err error) {
// To destroy a mapping, send an add-port with an internalPort of // To destroy a mapping, send an add-port with an internalPort of
// the internal port to destroy, an external port of zero and a // the internal port to destroy, an external port of zero and a