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66ae8737f4
This commit adds a new type to magicsock, epAddr, which largely ends up replacing netip.AddrPort in packet I/O paths throughout, enabling Geneve encapsulation over UDP awareness. The conn.ReceiveFunc for UDP has been revamped to fix and more clearly distinguish the different classes of packets we expect to receive: naked STUN binding messages, naked disco, naked WireGuard, Geneve-encapsulated disco, and Geneve-encapsulated WireGuard. Prior to this commit, STUN matching logic in the RX path could swallow a naked WireGuard packet if the keypair index, which is randomly generated, happened to overlap with a subset of the STUN magic cookie. Updates tailscale/corp#27502 Updates tailscale/corp#29326 Signed-off-by: Jordan Whited <jordan@tailscale.com>
24 lines
602 B
Go
24 lines
602 B
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package magicsock
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import (
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"golang.org/x/net/ipv4"
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"golang.org/x/net/ipv6"
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"tailscale.com/types/nettype"
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)
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var (
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// This acts as a compile-time check for our usage of ipv6.Message in
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// batchingConn for both IPv6 and IPv4 operations.
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_ ipv6.Message = ipv4.Message{}
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)
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// batchingConn is a nettype.PacketConn that provides batched i/o.
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type batchingConn interface {
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nettype.PacketConn
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ReadBatch(msgs []ipv6.Message, flags int) (n int, err error)
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WriteBatchTo(buffs [][]byte, addr epAddr, offset int) error
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}
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