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fa932fefe7
With #6566 we added an external mechanism for getting the default interface, and used it on macOS and iOS (see tailscale/corp#8201). The goal was to be able to get the default physical interface even when using an exit node (in which case the routing table would say that the Tailscale utun* interface is the default). However, the external mechanism turns out to be unreliable in some cases, e.g. when multiple cellular interfaces are present/toggled (I have occasionally gotten my phone into a state where it reports the pdp_ip1 interface as the default, even though it can't actually route traffic). It was observed that `ifconfig -v` on macOS reports an "effective interface" for the Tailscale utn* interface, which seems promising. By examining the ifconfig source code, it turns out that this is done via a SIOCGIFDELEGATE ioctl syscall. Though this is a private API, it appears to have been around for a long time (e.g. it's in the 10.13 xnu release at https://opensource.apple.com/source/xnu/xnu-4570.41.2/bsd/net/if_types.h.auto.html) and thus is unlikely to go away. We can thus use this ioctl if the routing table says that a utun* interface is the default, and go back to the simpler mechanism that we had before #6566. Updates #7184 Updates #7188 Signed-off-by: Mihai Parparita <mihai@tailscale.com>
29 lines
631 B
Go
29 lines
631 B
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// This might work on other BSDs, but only tested on FreeBSD.
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//go:build freebsd
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package interfaces
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import (
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"syscall"
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"golang.org/x/net/route"
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"golang.org/x/sys/unix"
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)
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// fetchRoutingTable calls route.FetchRIB, fetching NET_RT_DUMP.
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func fetchRoutingTable() (rib []byte, err error) {
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return route.FetchRIB(syscall.AF_UNSPEC, unix.NET_RT_DUMP, 0)
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}
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func parseRoutingTable(rib []byte) ([]route.Message, error) {
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return route.ParseRIB(syscall.NET_RT_IFLIST, rib)
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}
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func getDelegatedInterface(ifIndex int) (int, error) {
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return 0, nil
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}
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