Commit Graph

50 Commits (b62b07bc2df93b241ee383901a04c720a71d7fd4)

Author SHA1 Message Date
Dmytro Shynkevych 28e52a0492
all: dns refactor, add Proxied and PerDomain flags from control (#615)
Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>
4 years ago
Dmytro Shynkevych 8c850947db
router: split off sandboxed path from router_darwin (#624)
Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>
4 years ago
Dmytro Shynkevych 2ce2b63239
router: stop iOS subprocess sandbox violations (#617)
Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>
4 years ago
Dmytro Shynkevych 154d1cde05
router: reload systemd-resolved after changing /etc/resolv.conf (#619)
Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>
4 years ago
Dmytro Shynkevych c53ab3111d wgengine/router: support legacy resolvconf
Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>
4 years ago
David Anderson 189d86cce5 wgengine/router: don't use 88 or 8888 as table/rule numbers.
We originally picked those numbers somewhat at random, but with the idea
that 8 is a traditionally lucky number in Chinese culture. Unfortunately,
"88" is also neo-nazi shorthand language.

Use 52 instead, because those are the digits above the letters
"TS" (tailscale) on a qwerty keyboard, so we're unlikely to collide with
other users. 5, 2 and 52 are also pleasantly culturally meaningless.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 972a42cb33 wgengine/router: fix router_test to match the new marks.
Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson d60917c0f1 wgengine/router: switch packet marks to avoid conflict with Weave Net.
Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
Dmytro Shynkevych a3e7252ce6 wgengine/router: use better NetworkManager API
Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>
4 years ago
Eduardo Kienetz 5df6be9d38 Use LittleEndian for correct byte order on DNS IPs
Nameserver IP 10.11.12.13 would otherwise get written to resolv.conf as 13.12.11.10, as was happening on my client.

Signed-off-by: Eduardo Kienetz <eduardo@kienetz.com>
4 years ago
Wendi Yu c3736250a4
wgengine: fix macos staticcheck errors (#557)
Signed-off-by: Wendi <wendi.yu@yahoo.ca>
4 years ago
Dmytro Shynkevych 30bbbe9467
wgengine/router: dns: unify on *BSD, multimode on Linux, Magic DNS (#536)
Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>
4 years ago
Dmytro Shynkevych 61abab999e
cmd/tailscaled: graceful shutdown (#534)
Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>
4 years ago
Brad Fitzpatrick 742b8b44a8 net/tsaddr: new package to hold Tailscale-specific IPs/ranges
And update existing callers with (near) duplicated cases.
4 years ago
David Crawshaw 9258d64261 wgengine/router: do not call ifconfig up if SetRoutesFunc is set
The NetworkExtension brings up the interface itself and does not have
access to `ifconfig`, which the underlying BSD userspace router attempts
to use when Up is called.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
4 years ago
Reinaldo de Souza a8635784bc wgengine: add BSD userspace router to darwin
Darwin and FreeBSD are compatible enough to share the userspace router.

The OSX router delegates to the BSD userspace router unless `SetRoutesFunc` is set.
That preserves the mechanism that allows `ipn-go-bridge` to specify its own routing behavior.

Fixes #177

Signed-off-by: Reinaldo de Souza <github@rei.nal.do>
4 years ago
David Anderson 5a32f8e181 wgengine/router: also accept exit code 254 from `ip rule del`.
iproute2 3.16.0-2 from Debian Jessie (oldoldstable) doesn't return
exit code 2 when deleting a non-existent IP rule.

Fixes #434

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 08a38f21c9 wgengine/router: don't filter subnet routing in netfilter.
We have a filter in tailscaled itself now, which is more robust
against weird network topologies (such as the one Docker creates).

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
Avery Pennarun e7ae6a2e06 net/netns, wgengine/router: support Linux machines that don't have 'ip rule'.
We'll use SO_BINDTODEVICE instead of fancy policy routing. This has
some limitations: for example, we will route all traffic through the
interface that has the main "default" (0.0.0.0/0) route, so machines
that have multiple physical interfaces might have to go through DERP to
get to some peers. But machines with multiple physical interfaces are
very likely to have policy routing (ip rule) support anyway.

So far, the only OS I know of that needs this feature is ChromeOS
(crostini). Fixes #245.

Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
4 years ago
Avery Pennarun f0b6ba78e8 wgengine: don't pass nil router.Config objects.
These are hard for swift to decode in the iOS app.

Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
4 years ago
David Anderson 5114df415e net/netns: set the bypass socket mark on linux.
This allows tailscaled's own traffic to bypass Tailscale-managed routes,
so that things like tailscale-provided default routes don't break
tailscaled itself.

Progress on #144.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson fff062b461 wgengine/router: make runner.go linux-only for now.
Otherwise, staticcheck complains that these functions are unused
and unexported on macOS.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
Avery Pennarun f69003fd46 router_linux: work around terrible bugs in old iptables-compat versions.
Specifically, this sequence:
	iptables -N ts-forward
	iptables -A ts-forward -m mark --mark 0x10000 -j ACCEPT
	iptables -A FORWARD -j ts-forward
doesn't work on Debian-9-using-nftables, but this sequence:
	iptables -N ts-forward
	iptables -A FORWARD -j ts-forward
	iptables -A ts-forward -m mark --mark 0x10000 -j ACCEPT
does work.

I'm sure the reason why is totally fascinating, but it's an old version
of iptables and the bug doesn't seem to exist on modern nftables, so
let's refactor our code to add rules in the always-safe order and
pretend this never happened.

Fixes #401.

Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
4 years ago
Avery Pennarun 9ff51909a3 router_linux: fix behaviour when switching --netfilter-mode.
On startup, and when switching into =off and =nodivert, we were
deleting netfilter rules even if we weren't the ones that added them.

In order to avoid interfering with rules added by the sysadmin, we have
to be sure to delete rules only in the case that we added them in the
first place.

Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
4 years ago
Avery Pennarun a496cdc943 router_linux: remove need for iptables.ListChains().
Instead of retrieving the list of chains, or the list of rules in a
chain, just try deleting the ones we don't want and then adding the
ones we do want. An error in flushing/deleting still means the rule
doesn't exist anymore, so there was no need to check for it first.

This avoids the need to parse iptables output, which avoids the need to
ever call iptables -S, which fixes #403, among other things. It's also
much more future proof in case the iptables command line changes.

Unfortunately the iptables go module doesn't properly pass the iptables
command exit code back up when doing .Delete(), so we can't correctly
check the exit code there. (exit code 1 really means the rule didn't
exist, rather than some other weird problem).

Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
4 years ago
Avery Pennarun 8a6bd21baf router_linux: extract process runner routines into runner.go.
These will probably be useful across platforms. They're not really
Linux-specific at all.

Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
4 years ago
Avery Pennarun 34c30eaea0 router_linux: use only baseline 'ip rule' features that exist in old kernels.
This removes the use of suppress_ifgroup and fwmark "x/y" notation,
which are, among other things, not available in busybox and centos6.

We also use the return codes from the 'ip' program instead of trying to
parse its output.

I also had to remove the previous hack that routed all of 100.64.0.0/10
by default, because that would add the /10 route into the 'main' route
table instead of the new table 88, which is no good. It was a terrible
hack anyway; if we wanted to capture that route, we should have
captured it explicitly as a subnet route, not as part of the addr. Note
however that this change affects all platforms, so hopefully there
won't be any surprises elsewhere.

Fixes #405
Updates #320, #144

Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
4 years ago
David Anderson 7fb33123d3 wgengine/router: warn about another variation of busybox's `ip`.
Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
David Anderson 9c914dc7dd wgengine/router: stop using -m comment.
The comment module is compiled out on several embedded systems (and
also gentoo, because netfilter can't go brrrr with comments holding it
back). Attempting to use comments results in a confusing error, and a
non-functional firewall.

Additionally, make the legacy rule cleanup non-fatal, because we *do*
have to probe for the existence of these -m comment rules, and doing
so will error out on these systems.

Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
David Anderson 3e27b3c33c wgengine/router: more comments.
Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
David Anderson 0fe262f093 ipn: plumb NetfilterMode all the way out to the CLI.
Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
David Anderson c67c8913c3 wgengine/router: add a test for linux router state transitions.
Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
David Anderson 292606a975 wgengine/router: support multiple levels of netfilter involvement.
Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
Avery Pennarun d53e8fc0da router_darwin_support: we can build this on every platform.
Our new build scripts try to build ipn-go-bridge on more than just
linux and darwin, so let's enable this file so it can be successful on
every platform.
5 years ago
David Anderson 9ccbcda612 wgengine/router: rename config.Settings to config.Config, make pointer.
Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
David Anderson cd01bcc395 wgengine/router: allow loopback traffic from our own IP(s).
Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
David Anderson bfdc8175b1 wgengine/router: add a setting to disable SNAT for subnet routes.
Part of #320.

Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
David Anderson 21ac65d3da wgengine/router: explicitly detect and complain about busybox's `ip`.
Defensive programming against #368 in environments other than Docker,
e.g. if you try using Tailscale in Alpine Linux directly, sans
container.

Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
David Anderson 381b94d4d1 wgengine/router: include command output if `ip rule list` fails.
Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
David Anderson efc1feedc9 wgengine/router: include more information when iptables ops fail.
The iptables package we use doesn't include command output, so we're
left with guessing what went wrong most of the time. This will at
least narrow things down to which operation failed.

Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
David Anderson b01db109f5 wgengine/router: use inet.af/netaddr, not wgcfg.CIDR.
Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
David Anderson b8f01eed34 wgengine/router: remove wireguard-go config from settings.
Instead, pass in only exactly the relevant configuration pieces
that the OS network stack cares about.

Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
David Anderson 8861bb5a19 wgengine/router: alter API to support multiple addrs, and use on linux.
FreeBSD and OpenBSD will error out with a complaint if we pass >1 address
right now, but we don't yet so that's okay.
5 years ago
David Anderson 6802481bf5 wgengine/router: don't use gateway routes on linux. 5 years ago
David Anderson 78b1ed39ea wgengine/router: add more documentation. 5 years ago
David Anderson c9de43cd59 wgengine/router: fix typo.
Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
David Anderson 89198b1691 wgengine/router: rewrite netfilter and routing logic.
New logic installs precise filters for subnet routes,
plays nice with other users of netfilter, and lays the
groundwork for fixing routing loops via policy routing.

Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
David Anderson 7618d7e677 wgengine/router: simplify some cmd invocations.
Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
David Anderson 755fd9253c wgengine/router: fix up docstring.
Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago
David Anderson 1ac570def7 wgengine/router: split out from wgengine.
The router implementations are logically separate, with their own API.

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