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net/netns: add Windows support for bind-to-interface-by-route

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This is implemented via GetBestInterfaceEx. Should we encounter errors
or fail to resolve a valid, non-Tailscale interface, we fall back to
returning the index for the default interface instead.

Fixes #12551

Signed-off-by: Aaron Klotz <aaron@tailscale.com>
This commit is contained in:
Aaron Klotz
2024-05-21 14:38:53 -06:00
parent 591979b95f
commit 7dd76c3411
10 changed files with 313 additions and 28 deletions
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9
net/netns/mksyscall.go Normal file
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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package netns
//go:generate go run golang.org/x/sys/windows/mkwinsyscall -output zsyscall_windows.go mksyscall.go
//go:generate go run golang.org/x/tools/cmd/goimports -w zsyscall_windows.go
//sys getBestInterfaceEx(sockaddr *winipcfg.RawSockaddrInet, bestIfaceIndex *uint32) (ret error) = iphlpapi.GetBestInterfaceEx