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magicsock: lookup AddrSet by key from DERP

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Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
This commit is contained in:
David Crawshaw 2020-03-04 13:43:06 -05:00 committed by David Crawshaw
parent 57de94c7aa
commit 7932481b95
1 changed files with 12 additions and 4 deletions
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16
wgengine/magicsock/magicsock.go
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@ -66,7 +66,8 @@ type Conn struct {
// 10.0.0.2:2 -> [10.0.0.1:1, 10.0.0.2:2]
// 10.0.0.3:3 -> [10.0.0.3:3]
addrsMu sync.Mutex
addrsByUDP map[udpAddr]*AddrSet
addrsByUDP map[udpAddr]*AddrSet // TODO: clean up this map sometime?
addrsByKey map[key.Public]*AddrSet // TODO: clean up this map sometime?
// stunReceiveFunc holds the current STUN packet processing func.
// Its Loaded value is always non-nil.
@ -161,6 +162,7 @@ func Listen(opts Options) (*Conn, error) {
epFunc: opts.endpointsFunc(),
logf: log.Printf,
addrsByUDP: make(map[udpAddr]*AddrSet),
addrsByKey: make(map[key.Public]*AddrSet),
wantDerp: true,
derpRecvCh: make(chan derpReadResult),
udpRecvCh: make(chan udpReadResult),
@ -823,9 +825,14 @@ func (c *Conn) ReceiveIPv4(b []byte) (n int, ep conn.Endpoint, addr *net.UDPAddr
return 0, nil, nil, err
}
// TODO: look up addrSet from dm.Source public key, if
// found (Source might be zero for a short period of
// time until DERP servers re-deployed)
c.addrsMu.Lock()
addrSet = c.addrsByKey[dm.src]
c.addrsMu.Unlock()
if addrSet == nil {
key := wgcfg.Key(dm.src)
log.Printf("magicsock: DERP packet from unknown key: %s", key.ShortString())
}
case um := <-c.udpRecvCh:
if um.err != nil {
@ -1180,6 +1187,7 @@ func (c *Conn) CreateEndpoint(key [32]byte, addrs string) (conn.Endpoint, error)
copy(epAddr.ip.Addr[:], addr.IP.To16())
epAddr.port = uint16(addr.Port)
c.addrsByUDP[epAddr] = a
c.addrsByKey[key] = a
}
c.addrsMu.Unlock()