Commit Graph

225 Commits (93cab562772fdd1719546d4c54b5ba09452eb411)

Author SHA1 Message Date
Brad Fitzpatrick d24ed3f68e wgengine/router: add debug knob to resort to Linux "ip" command usage
Tailscale 1.18 uses netlink instead of the "ip" command to program the
Linux kernel.

The old way was kept primarily for tests, but this also adds a
TS_DEBUG_USE_IP_COMMAND environment knob to force the old way
temporarily for debugging anybody who might have problems with the
new way in 1.18.

Updates #391

Change-Id: I0236fbfda6c9c05dcb3554fcc27ec0c86456efd9
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Josh Bleecher Snyder 3fd5f4380f util/multierr: new package
github.com/go-multierror/multierror served us well.
But we need a few feature from it (implement Is),
and it's not worth maintaining a fork of such a small module.

Instead, I did a clean room implementation inspired by its API.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
3 years ago
Brad Fitzpatrick 408b0923a6 wgengine/router: remove last non-test "ip" command usage on Linux
Updates #391

Change-Id: Ic2c3f8460b1e4b8d34b936a1725705fcc1effbae
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick ff1954cfd9 wgengine/router: use netlink for ip rules on Linux
Using temporary netlink fork in github.com/tailscale/netlink until we
get the necessary changes upstream in either vishvananda/netlink
or jsimonetti/rtnetlink.

Updates #391

Change-Id: I6e1de96cf0750ccba53dabff670aca0c56dffb7c
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 19189d7018 wgengine/router: add a addrFamily type [linux]
In prep for more netlink-ification.

Change-Id: I7c34a04001988107dc2583597aa4f26ddb887e91
3 years ago
Brad Fitzpatrick 7c40a5d440 wgengine/router: refactor in prep for Linux netlink-ification
Pull out the list of policy routing rules to a data structure
now shared between the add & delete paths, but to also be shared
by the netlink paths in a future change.

Updates #391

Change-Id: I119ab1c246f141d639006c808b61c585c3d67924
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick aad46bd9ff wgengine/router: stop cleaning up old dev rules on Linux
Anybody using that one old, unreleased version of Tailscale from over
a year ago should've rebooted their machine by now to get various
non-Tailscale security updates. :)

Change-Id: If9e043cb008b20fcd6ddfd03756b3b23a9d7aeb5
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick d36c0d3566 wgengine/router: add debug test to enumerate rules
No non-test changes.

Updates #391

Change-Id: Ia88610c08e07a119d002e58250463cb4659b9f54
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick dc2fbf5877 wgengine/router: start using netlink instead of 'ip' on Linux
Converts up, down, add/del addresses, add/del routes.

Not yet done: rules.

Updates #391

Change-Id: I02554ca07046d18f838e04a626ba99bbd35266fb
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 9310713bfb all: fix some js/wasm compilation issues
Change-Id: I05a3a4835e225a1e413ec3540a7c7e4a2d477084
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Maisem Ali 53199738fb wgengine: don't try to delete legacy netfilter rules on synology.
Signed-off-by: Maisem Ali <maisem@tailscale.com>
3 years ago
Maisem Ali 27799a1a96 wgengine: only use AmbientCaps on DSM7+
Signed-off-by: Maisem Ali <maisem@tailscale.com>
3 years ago
Brad Fitzpatrick 14f9c75293 wgengine/router: ignore Linux ip route error adding dup route
Updates #3060
Updates #391

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
nicksherron f01ff18b6f all: fix spelling mistakes
Signed-off-by: nicksherron <nsherron90@gmail.com>
3 years ago
Brad Fitzpatrick 4c68b7df7c tstest: add MemLogger bytes.Buffer wrapper with Logf method
We use it tons of places. Updated three at least in this PR.

Another use in next commit.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Denton Gentry 6731f934a6 Revert "wgengine: actively log FlushDNS."
This log is quite verbose, it was only to be left in for one
unstable build to help debug a user issue.

This reverts commit 1dd2552032.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
3 years ago
Denton Gentry 1dd2552032 wgengine: actively log FlushDNS.
Intended to help in resolving customer issue with
DNS caching.

We currently exec `ipconfig /flushdns` from two
places:
- SetDNS(), which logs before invoking
- here in router_windows, which doesn't

We'd like to see a positive indication in logs that flushdns
is being run.

As this log is expected to be spammy, it is proposed to
leave this in just long enough to do an unstable 1.13.x build
and then revert it. They won't run an unsigned image that
I build.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
3 years ago
Maisem Ali 5c383bdf5d wgengine/router: pass in AmbientCaps when calling `ip rule`
Signed-off-by: Maisem Ali <maisem@tailscale.com>
3 years ago
Josh Bleecher Snyder a5da4ed981 all: gofmt with Go 1.17
This adds "//go:build" lines and tidies up existing "// +build" lines.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
3 years ago
Brad Fitzpatrick e4fecfe31d wgengine/{monitor,router}: restore Linux ip rules when systemd deletes them
Thanks.

Fixes #1591

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick ed8587f90d wgengine/router: take a link monitor
Prep for #1591 which will need to make Linux's router react to changes
that the link monitor observes.

The router package already depended on the monitor package
transitively. Now it's explicit.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Maisem Ali ec52760a3d wgengine/router_windows: support toggling local lan access when using
exit nodes.

Signed-off-by: Maisem Ali <maisem@tailscale.com>
3 years ago
Fletcher Nichol a49df5cfda wgenine/router: fix OpenBSD route creation
The route creation for the `tun` device was augmented in #1469 but
didn't account for adding IPv4 vs. IPv6 routes. There are 2 primary
changes as a result:

* Ensure that either `-inet` or `-inet6` was used in the
  [`route(8)`](https://man.openbsd.org/route) command
* Use either the `localAddr4` or `localAddr6` for the gateway argument
  depending which destination network is being added

The basis for the approach is based on the implementation from
`router_userspace_bsd.go`, including the `inet()` helper function.

Fixes #2048
References #1469

Signed-off-by: Fletcher Nichol <fnichol@nichol.ca>
3 years ago
Josh Bleecher Snyder 1ece91cede go.mod: upgrade wireguard-windows, de-fork wireguard-go
Pull in the latest version of wireguard-windows.

Switch to upstream wireguard-go.
This requires reverting all of our import paths.

Unfortunately, this has to happen at the same time.
The wireguard-go change is very low risk,
as that commit matches our fork almost exactly.
(The only changes are import paths, CI files, and a go.mod entry.)
So if there are issues as a result of this commit,
the first place to look is wireguard-windows changes.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
4 years ago
Josh Bleecher Snyder 25df067dd0 all: adapt to opaque netaddr types
This commit is a mishmash of automated edits using gofmt:

gofmt -r 'netaddr.IPPort{IP: a, Port: b} -> netaddr.IPPortFrom(a, b)' -w .
gofmt -r 'netaddr.IPPrefix{IP: a, Port: b} -> netaddr.IPPrefixFrom(a, b)' -w .

gofmt -r 'a.IP.Is4 -> a.IP().Is4' -w .
gofmt -r 'a.IP.As16 -> a.IP().As16' -w .
gofmt -r 'a.IP.Is6 -> a.IP().Is6' -w .
gofmt -r 'a.IP.As4 -> a.IP().As4' -w .
gofmt -r 'a.IP.String -> a.IP().String' -w .

And regexps:

\w*(.*)\.Port = (.*)  ->  $1 = $1.WithPort($2)
\w*(.*)\.IP = (.*)  ->  $1 = $1.WithIP($2)

And lots of manual fixups.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
4 years ago
Josh Bleecher Snyder 47ebd1e9a2 wgengine/router: use net.IP.Equal instead of bytes.Equal to compare IPs
Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
4 years ago
Josh Bleecher Snyder f91c2dfaca wgengine/router: remove unused field
Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
4 years ago
Josh Bleecher Snyder 9360f36ebd all: use lower-case letters at the start of error message
Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
4 years ago
Josh Bleecher Snyder 20e04418ff net/dns: add GOOS build tags
Fixes #1786

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
4 years ago
Maisem Ali 590792915a wgengine/router{win}: ignore broadcast routes added by Windows when removing routes.
Signed-off-by: Maisem Ali <maisem@tailscale.com>
4 years ago
Maisem Ali 4f3203556d wgengine/router: add the Tailscale ULA route on darwin.
Signed-off-by: Maisem Ali <maisem@tailscale.com>
4 years ago
Maisem Ali 1b9d8771dc ipn/ipnlocal,wgengine/router,cmd/tailscale: add flag to allow local lan access when routing traffic via an exit node.
For #1527

Signed-off-by: Maisem Ali <maisem@tailscale.com>
4 years ago
David Anderson 19eca34f47 wgengine/router: fix FreeBSD configuration failure on the v6 /48.
On FreeBSD, we add the interface IP as a /48 to work around a kernel
bug, so we mustn't then try to add a /48 route to the Tailscale ULA,
since that will fail as a dupe.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 4a64d2a603 net/dns: some post-review cleanups.
Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 68f76e9aa1 net/dns: add GetBaseConfig to OSConfigurator interface.
Part of #953, required to make split DNS work on more basic
platforms.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson de6dc4c510 net/dns: add a Primary field to OSConfig.
Currently ignored.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 4c61ebacf4 wgengine: move DNS configuration out of wgengine/router.
Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 27a1a2976a wgengine/router: add a CallbackRouter shim.
The shim implements both network and DNS configurators,
and feeds both into a single callback that receives
both configs.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 6ad44f9fdf wgengine: take in dns.Config, split out to resolver.Config and dns.OSConfig.
Stepping stone towards having the DNS package handle the config splitting.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 8af9d770cf net/dns: rename Config to OSConfig.
Making way for a new higher level config struct.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson fcfc0d3a08 net/dns: remove ManagerConfig, pass relevant args directly.
Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson f77ba75d6c wgengine/router: move DNS cleanup into the DNS package.
Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 15875ccc63 wgengine/router: don't store unused tunname on windows. 4 years ago
Brad Fitzpatrick e64383a80e wgengine/router: document some fields a bit more
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
David Anderson 2b4bfeda1a wgengine: pass in an explicit router.Router, rather than a generator.
Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 0a84aaca0a wgengine/router: remove unused wireguard *Device argument.
Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 672731ac6f many: gofmt.
Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 6521f02ff6 Move DNS flush logic to net/dns.
Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 9f7f2af008 wgengine/router/dns: move to net/dns.
Preparation for merging the APIs and whatnot.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 8432999835 Move wgengine/tsdns to net/dns.
Straight move+fixup, no other changes. In prep for merging with
wgengine/router/dns.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
Brad Fitzpatrick e2b3d9aa5f all: s/Magic DNS/MagicDNS/ for consistency
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
Brad Fitzpatrick 232cfda280 wgengine/router: report to control when setPrivateNetwork fails
Fixes #1503

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
Brad Fitzpatrick d580b3f09e wgengine/router: fix go vet failure on BSDs
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
Aleksandar Pesic 25d2dd868b wgengine/router: flushdns in windows when router config changes
Fixes: https://github.com/tailscale/tailscale/issues/1430

Signed-off-by: Aleksandar Pesic <peske.nis@gmail.com>
4 years ago
David Anderson fa6110e47b wgengine/router: don't touch interface routes
Developed by a cast of dozens.

Fixes #1448

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
Denton Gentry 04e72f95cc wgengine/router: add OpenBSD IPv6 support.
Similar to FreeBSD in https://github.com/tailscale/tailscale/issues/1307,
add IPv6 addresses with a prefix length of 48.

Fixes https://github.com/tailscale/tailscale/issues/1372

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
4 years ago
Denton Gentry bcea88da46 wgengine: support FreeBSD with IPv6.
Fixes https://github.com/tailscale/tailscale/issues/1307 for keepsies.

We cannot set the tun interface address as a /128 on FreeBSD,
due to https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218508
Instead we set the interface address as a /48, which is enabled
by commit 82edf94df7.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
4 years ago
Denton Gentry c8af6bc009 Revert "freebsd: ignore IPv6 for now"
This reverts commit 061422affc.

We have a way to support IPv6 on FreeBSD now.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
4 years ago
Denton Gentry 061422affc freebsd: ignore IPv6 for now
FreeBSD tun devices don't work with the way we implement IPv6
https://github.com/tailscale/tailscale/issues/1307

At least for now, remove any IPv6 addresses from the netmap.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
4 years ago
David Anderson 1cb0ffc3ff wgengine/router: make windows gracefully handle disabled IPv4 or IPv6.
This is necessary because either protocol can be disabled globally by a
Windows registry policy, at which point trying to touch that address
family results in "Element not found" errors. This change skips programming
address families that Windows tell us are unavailable.

Fixes #1396.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 8d77dfdacb wgengine/router: add a dummy IPv6 address if needed for default routing.
Fixes #1339

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 793cb131f0 wgengine/router: toggle killswitch when using default routes on windows.
Fixes #1398.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 54d7070121 wgengine/router: correctly read IPv6 routes when diffing.
Fixes #1185.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
Brad Fitzpatrick 2d96215d97 wgengine/router: make Linux delRoute idempotent, cidrDiff fail late as possible
This makes cidrDiff do as much as possible before failing, and makes a
delete of an already-deleted rule be a no-op. We should never do this
ourselves, but other things on the system can, and this should help us
recover a bit.

Also adds the start of root-requiring tests.

TODO: hook into wgengine/monitor and notice when routes are changed
behind our back, and invalidate our routes map and re-read from
kernel (via the ip command) at least on the next reconfig call.

Updates tailscale/corp#1338

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
Brad Fitzpatrick 96a488e37e wgengine/router: simplify func normalizeCIDR using netaddr method 4 years ago
Brad Fitzpatrick 88ab0173a7 wgengine/router: fix BSD router to support multiple local addrs, IPv6
Fixes #1201
4 years ago
Brad Fitzpatrick 1ec64bc94d wgengine/router: add another Windows firewall rule to allow incoming UDP
Based on @sailorfrag's research.

Fixes #1312

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
Brad Fitzpatrick d76334d2f0 ipn: split LocalBackend off into new ipn/ipnlocal package
And move a couple other types down into leafier packages.

Now cmd/tailscale doesn't bring in netlink, magicsock, wgengine, etc.

Fixes #1181

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
Brad Fitzpatrick a2aa6cd2ed wgengine/router: clarify disabled IPv6 message on Linux 4 years ago
David Anderson 267531e4f8 wgengine/router: probe better for v6 policy routing support.
Previously we disabled v6 support if the disable_policy knob was
missing in /proc, but some kernels support policy routing without
exposing the toggle. So instead, treat disable_policy absence as a
"maybe", and make the direct `ip -6 rule` probing a bit more
elaborate to compensate.

Fixes #1241.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
Brad Fitzpatrick c7fc4a06da wgengine/router: don't configure IPv6 on Linux when IPv6 is unavailable
Fixes #1214

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
Brad Fitzpatrick 4fea604979 wgengine/router: stop setPrivateNetwork goroutine on configureInterface failure
On Windows, configureInterface starts a goroutine reconfiguring the
Windows firewall.

But if configureInterface fails later, that goroutine kept running and
likely failing forever, spamming logs. Make it stop quietly if its
launching goroutine filed.
4 years ago
Alex Brainman 6e4231c03c wgengine/router/dns: remove unused code
Commit 68ddf1 removed code that reads
`SOFTWARE\Tailscale IPN\SearchList` registry value. But the commit
left code that writes that value.

So now this package writes and never reads the value.

Remove the code to stop pointless work.

Updates #853

Signed-off-by: Alex Brainman <alex.brainman@gmail.com>
4 years ago
Brad Fitzpatrick 0d94fe5f69
wgengine/router: disable IPv6 on Linux if ip rule -6 fails (#1074)
Updates #562
Fixes #973

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
Josh Bleecher Snyder 2fe770ed72 all: replace wgcfg.IP and wgcfg.CIDR with netaddr types
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
4 years ago
David Crawshaw 2b2a16d9a2 wgengine/router/dns: reduce windows registry key open timeout
The windows key timeout is longer than the wgengine watchdog timeout,
which means we never reach the timeout, instead the process exits.
Reduce the timeout so if we do hit it, at least the process continues.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
4 years ago
David Crawshaw b4f70d8232 wgengine/router/dns: use the correct interface GUID
On Win10, there's a hardcoded GUID and this works.
On Win7, this GUID changes and we need to ask the tun for its
LUID and convert that from the GUID.

This commit uses the computed GUID that is placed in InterfaceName.

Diagnosed by Jason Donnenfeld. (Thanks!)
4 years ago
Brad Fitzpatrick 15c064f76f wgengine/router/dns: remove unsafe endianness detection on Linux 4 years ago
Brad Fitzpatrick f9659323df wgengine/router/dns: fix typo in comment 4 years ago
Brad Fitzpatrick 053a1d1340 all: annotate log verbosity levels on most egregiously spammy log prints
Fixes #924
Fixes #282

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
Josh Bleecher Snyder 6db9c4a173 wgenginer/router/dns: use constant from golang.org/x/sys/windows
Made available in https://golang.org/cl/277153
4 years ago
Aleksandar Pesic 0dc295a640 Isolate WireGuard code into a separate file with appropriate copyright info in header.
Signed-off-by: Aleksandar Pesic <peske.nis@gmail.com>
4 years ago
Aleksandar Pesic d854fe95d2 Trivial change in function description.
Signed-off-by: Aleksandar Pesic <peske.nis@gmail.com>
4 years ago
Aleksandar Pesic 338fd44657 Replace registry-access code, update wireguard-go and x/sys/windows.
Signed-off-by: Aleksandar Pesic <peske.nis@gmail.com>
4 years ago
Aleksandar Pesic 274d32d0aa Prepare for the new wireguard-go API.
Signed-off-by: Aleksandar Pesic <peske.nis@gmail.com>
4 years ago
Brad Fitzpatrick fc8bc76e58 wgengine/router: lock goroutine to OS thread before using OLE [windows]
See https://github.com/tailscale/tailscale/issues/921#issuecomment-727526807

Not yet sure whether this is our problem, but it can't hurt at least,
and seems like what we're supposed to do.

Updates #921
4 years ago
David Anderson a664aac877 wgengine/router: disable IPv6 if v6 policy routing is unavailable.
Fixes #895.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson ebd96bf4a9 wgengine/router/dns: use OpenKeyWait to set DNS configuration.
Fixes tailscale/corp#839.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
Brad Fitzpatrick 119101962c wgengine/router: don't double-prefix dns log messages [Windows] 4 years ago
Brad Fitzpatrick 28f6552646 wgengine/router/dns: run ipconfig /registerdns async, log timing
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
Brad Fitzpatrick 01ee638cca Change some os.IsNotExist to errors.Is(err, os.ErrNotExist) for non-os errors.
os.IsNotExist doesn't unwrap errors. errors.Is does.

The ioutil.ReadFile ones happened to be fine but I changed them so
we're consistent with the rule: if the error comes from os, you can
use os.IsNotExist, but from any other package, use errors.Is.
(errors.Is always would also work, but not worth updating all the code)

The motivation here was that we were logging about failure to migrate
legacy relay node prefs file on startup, even though the code tried
to avoid that.

See golang/go#41122
4 years ago
David Anderson 68ddf134d7 wgengine/router/dns: issue ipconfig /registerdns when applying DNS settings.
Amazingly, there doesn't seem to be a documented way of updating network
configuration programmatically in a way that Windows takes notice of.
The naturopathic remedy for this is to invoke ipconfig /registerdns, which
does a variety of harmless things and also invokes the private API that
tells windows to notice new adapter settings. This makes our DNS config
changes stick within a few seconds of us setting them.

If we're invoking a shell command anyway, why futz with the registry at
all? Because netsh has no command for changing the DNS suffix list, and
its commands for setting resolvers requires parsing its output and
keeping track of which server is in what index. Amazingly, twiddling
the registry directly is the less painful option.

Fixes #853.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
Brad Fitzpatrick 508f5c3ae0 wgengine/router: fix bug where getInterfaceRoutes always returned an empty list
Regression from f2ce64f0c6 (r43710860)

Fixes #870
4 years ago
Brad Fitzpatrick 38bde61b3d wgengine/router: make Windows firewall configuration async
Updating the Windows firewall is usually reasonably fast, but
sometimes blocks for 20 seconds, 4 minutes, etc. Not sure why.

Until we understand that's happening, configure it in the background
without blocking the normal control flow.

Updates #785

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
David Anderson ff0cf6340a wgengine/router: fix configuration of loopback netfilter rules for v6.
Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
Alex Brainman f2ce64f0c6 wgengine/router: unfork winipcfg-go package, use upstream
Use golang.zx2c4.com/wireguard/windows/tunnel/winipcfg
instead of github.com/tailscale/winipcfg-go package.

Updates #760

Signed-off-by: Alex Brainman <alex.brainman@gmail.com>
4 years ago
David Anderson c493e5804f wgengine/router: make v6-ness configurable in test, for consistent results.
Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
Brad Fitzpatrick c86761cfd1 Remove tuntap references. We only use TUN. 4 years ago
Brad Fitzpatrick bbb56f2303 wgengine/router: fix tests on Debian Buster as regular user on machine with IPv6 4 years ago
David Anderson fddbcb0c7b wgengine/router: support various degrees of broken IPv6.
Gracefully skips touching the v6 NAT table on systems that don't have
it, and doesn't configure IPv6 at all if IPv6 is globally disabled.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago