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wgengine/magicsock: fix panic in wireguard-go rate limiting path
Fixes #6686
Change-Id: I1055a87141b07261afed8e36c963a69f3be26088
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
(cherry picked from commit 44be59c15a
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@ -3329,7 +3329,7 @@ type endpoint struct {
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publicKey key.NodePublic // peer public key (for WireGuard + DERP)
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publicKeyHex string // cached output of publicKey.UntypedHexString
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fakeWGAddr netip.AddrPort // the UDP address we tell wireguard-go we're using
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nodeAddr netip.Addr // the node's first tailscale address (only used for logging)
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nodeAddr netip.Addr // the node's first tailscale address; used for logging & wireguard rate-limiting (Issue 6686)
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// mu protects all following fields.
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mu sync.Mutex // Lock ordering: Conn.mu, then endpoint.mu
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@ -3516,7 +3516,7 @@ func (de *endpoint) ClearSrc() {}
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func (de *endpoint) SrcToString() string { panic("unused") } // unused by wireguard-go
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func (de *endpoint) SrcIP() netip.Addr { panic("unused") } // unused by wireguard-go
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func (de *endpoint) DstToString() string { return de.publicKeyHex }
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func (de *endpoint) DstIP() netip.Addr { panic("unused") }
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func (de *endpoint) DstIP() netip.Addr { return de.nodeAddr } // see tailscale/tailscale#6686
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func (de *endpoint) DstToBytes() []byte { return packIPPort(de.fakeWGAddr) }
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// addrForSendLocked returns the address(es) that should be used for
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