Commit Graph

60 Commits

Author SHA1 Message Date
Brad Fitzpatrick
6eed2811b2 wgengine/netstack: start supporting different SSH users
Updates #3802

Change-Id: I44de6897e36b1362cd74c9b10c9cbfeb9abc3dbc
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2022-02-02 13:58:31 -08:00
Brad Fitzpatrick
bd90781b34 ipn/ipnlocal, wgengine/netstack: use netstack for peerapi server
We're finding a bunch of host operating systems/firewalls interact poorly
with peerapi. We either get ICMP errors from the host or users need to run
commands to allow the peerapi port:

https://github.com/tailscale/tailscale/issues/3842#issuecomment-1025133727

... even though the peerapi should be an internal implementation detail.

Rather than fight the host OS & firewalls, this change handles the
server side of peerapi entirely in netstack (except on iOS), so it
never makes its way to the host OS where it might be messed with. Two
main downsides are:

1) netstack isn't as fast, but we don't really need speed for peerapi.
   And actually, with fewer trips to/from the kernel, we might
   actually make up for some of the netstack performance loss by
   staying in userspace.

2) tcpdump / Wireshark etc packet captures will no longer see the peerapi
   traffic. Oh well. Crawshaw's been wanting to add packet capture server
   support to tailscaled, so we'll probably do that sooner now.

A future change might also then use peerapi for the client-side
(except on iOS).

Updates #3842 (probably fixes, as well as many exit node issues I bet)

Change-Id: Ibc25edbb895dc083d1f07bd3cab614134705aa39
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2022-01-31 14:20:08 -08:00
Brad Fitzpatrick
1af26222b6 go.mod: bump netstack, switch to upstream netstack
Now that Go 1.17 has module graph pruning
(https://go.dev/doc/go1.17#go-command), we should be able to use
upstream netstack without breaking our private repo's build
that then depends on the tailscale.com Go module.

This is that experiment.

Updates #1518 (the original bug to break out netstack to own module)
Updates #2642 (this updates netstack, but doesn't remove workaround)

Change-Id: I27a252c74a517053462e5250db09f379de8ac8ff
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2022-01-26 11:30:03 -08:00
Brad Fitzpatrick
f3c0023add wgengine/netstack: add an SSH server experiment
Disabled by default.

To use, run tailscaled with:

    TS_SSH_ALLOW_LOGIN=you@bar.com

And enable with:

    $ TAILSCALE_USE_WIP_CODE=true tailscale up --ssh=true

Then ssh [any-user]@[your-tailscale-ip] for a root bash shell.
(both the "root" and "bash" part are temporary)

Updates #3802

Change-Id: I268f8c3c95c8eed5f3231d712a5dc89615a406f0
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2022-01-24 19:14:13 -08:00
Brad Fitzpatrick
41fd4eab5c envknob: add new package for all the strconv.ParseBool(os.Getenv(..))
A new package can also later record/report which knobs are checked and
set. It also makes the code cleaner & easier to grep for env knobs.

Change-Id: Id8a123ab7539f1fadbd27e0cbeac79c2e4f09751
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2022-01-24 11:51:23 -08:00
Brad Fitzpatrick
c64af5e676 wgengine/netstack: clear TCP ECN bits before giving to gvisor
Updates #2642

Change-Id: Ic219442a2656dd9dc99ae1dd91e907fd3d924987
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2022-01-19 20:09:24 -08:00
Brad Fitzpatrick
185825df11 wgengine/netstack: add a missing refcount decrement after packet injection
Fixes #3762
Updates #3745 (probably fixes?)

Change-Id: I1d3f0590fd5b8adfbc9110bc45ff717bb9e79aae
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2022-01-19 12:28:43 -08:00
Brad Fitzpatrick
790e41645b wgengine/netstack: add an Impl.Close method for tests
Change-Id: Idbb3fd6d749d3e4effdf96de77a1106584822fef
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2022-01-19 12:28:43 -08:00
Brad Fitzpatrick
166fe3fb12 wgengine/netstack: add missing error logging in a RST case
Updates #2642

Change-Id: I9f2f8fd28fc980208b0739eb9caf9db7b0977c09
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2022-01-18 14:15:32 -08:00
Brad Fitzpatrick
6be48dfcc6 wgengine/netstack: fix netstack ping timeout on darwin
-W is milliseconds on darwin, not seconds, and empirically it's
milliseconds after a 1 second base.

Change-Id: I2520619e6699d9c505d9645ce4dfee4973555227
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2022-01-18 08:00:30 -08:00
Brad Fitzpatrick
a93937abc3 wgengine/netstack: make userspace ping work when tailscaled has CAP_NET_RAW
Updates #3710

Change-Id: Ief56c7ac20f5f09a2f940a1906b9efbf1b0d6932
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2022-01-12 14:23:39 -08:00
Brad Fitzpatrick
1a4e8da084 wgengine/netstack: fake pings through netstack on Android too
Every OS ping binary is slightly different. Adjust for Android's.

Updates #1738

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2022-01-07 10:05:32 -08:00
Brad Fitzpatrick
1b426cc232 wgengine/netstack: add env knob to turn on netstack debug logs
Except for the super verbose packet-level dumps. Keep those disabled
by default with a const.

Updates #2642

Change-Id: Ia9eae1677e8b3fe6f457a59e44896a335d95d547
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2022-01-06 16:59:35 -08:00
Brad Fitzpatrick
5a9914a92f wgengine/netstack: don't remove 255.255.255.255/32 from netstack
The intent of the updateIPs code is to add & remove IP addresses
to netstack based on what we get from the netmap.

But netstack itself adds 255.255.255.255/32 apparently and we always
fight it (and it adds it back?). So stop fighting it.

Updates #2642 (maybe fixes? maybe.)

Change-Id: I37cb23f8e3f07a42a1a55a585689ca51c2be7c60
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-12-16 14:15:07 -08:00
Josh Bleecher Snyder
93ae11105d ipn/ipnlocal: clear magicsock's netmap on logout
magicsock was hanging onto its netmap on logout,
which caused tailscale status to display partial
information about a bunch of zombie peers.
After logout, there should be no peers.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-12-15 17:00:08 -08:00
Brad Fitzpatrick
6590fc3a94 wgengine/netstack: remove some logging on forwarding connections
Change-Id: Ib1165b918cd5da38583f8e7d4be8cda54af3c81d
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-12-15 11:38:25 -08:00
Brad Fitzpatrick
b59e7669c1 wgengine/netstack: in netstack/hybrid mode, fake ICMP using ping command
Change-Id: I42cb4b9b326337f4090d9cea532230e36944b6cb
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-12-09 09:30:10 -08:00
Brad Fitzpatrick
9c5c9d0a50 ipn/ipnlocal, net/tsdial: make SOCKS/HTTP dials use ExitDNS
And simplify, unexport some tsdial/netstack stuff in the the process.

Fixes #3475

Change-Id: I186a5a5cbd8958e25c075b4676f7f6e70f3ff76e
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-12-03 13:39:37 -08:00
Brad Fitzpatrick
adc5997592 net/tsdial: give netstack a Dialer, start refactoring name resolution
This starts to refactor tsdial.Dialer's name resolution to have
different stages: in-memory MagicDNS vs system resolution. A future
change will plug in ExitDNS resolution.

This also plumbs a Dialer into netstack and unexports the dnsMap
internals.

And it removes some of the async AddNetworkMapCallback usage and
replaces it with synchronous updates of the Dialer's netmap
from LocalBackend, since the LocalBackend has the Dialer too.

Updates #3475

Change-Id: Idcb7b1169878c74f0522f5151031ccbc49fe4cb4
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-12-02 11:33:13 -08:00
Brad Fitzpatrick
d5405c66b7 net/tsdial: start of new package to unify all outbound dialing complexity
For now this just deletes the net/socks5/tssocks implementation (and
the DNSMap stuff from wgengine/netstack) and moves it into net/tsdial.

Then initialize a Dialer early in tailscaled, currently only use for the
outbound and SOCKS5 proxies. It will be plumbed more later. Notably, it
needs to get down into the DNS forwarder for exit node DNS forwading
in netstack mode. But it will also absorb all the peerapi setsockopt
and netns Dial and tlsdial complexity too.

Updates #1713

Change-Id: Ibc6d56ae21a22655b2fa1002d8fc3f2b2ae8b6df
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-11-30 17:21:49 -08:00
Brad Fitzpatrick
2ea765e5d8 go.mod: bump inet.af/netstack
Updates #2642 (I'd hoped, but doesn't seem to fix it)

Change-Id: Id54af7c90a1206bc7018215957e20e954782b911
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-11-21 09:18:31 -08:00
Brad Fitzpatrick
5dc5bd8d20 cmd/tailscaled, wgengine/netstack: always wire up netstack
Even if not in use. We plan to use it for more stuff later.

(not for iOS or macOS-GUIs yet; only tailscaled)

Change-Id: Idaef719d2a009be6a39f158fd8f57f8cca68e0ee
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-11-01 14:11:30 -07:00
Brad Fitzpatrick
29a8fb45d3 wgengine/netstack: include DNS.ExtraRecords in DNSMap
So SOCKS5 dialer can dial HTTPS cert names, for instance.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-09-28 10:01:36 -07:00
Brad Fitzpatrick
83906abc5e wgengine/netstack: clarify a comment
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-08-27 11:10:56 -07:00
Brad Fitzpatrick
1925fb584e wgengine/netstack: fix crash in userspace netstack TCP forwarding
Fixes #2658

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-08-25 15:48:05 -07:00
Brad Fitzpatrick
95a9adbb97 wgengine/netstack: implement UDP relaying to advertised subnets
TCP was done in 662fbd4a09.

This does the same for UDP.

Tested by hand. Integration tests will have to come later. I'd wanted
to do it in this commit, but the SOCKS5 server needed for interop
testing between two userspace nodes doesn't yet support UDP and I
didn't want to invent some whole new userspace packet injection
interface at this point, as SOCKS seems like a better route, but
that's its own bug.

Fixes #2302

RELNOTE=netstack mode can now UDP relay to subnets

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-07-21 22:32:26 -07:00
Brad Fitzpatrick
ecac74bb65 wgengine/netstack: fix doc comment
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-07-21 08:25:05 -07:00
Brad Fitzpatrick
722859b476 wgengine/netstack: make SOCKS5 resolve names to IPv6 if self node when no IPv4
For instance, ephemeral nodes with only IPv6 addresses can now
SOCKS5-dial out to names like "foo" and resolve foo's IPv6 address
rather than foo's IPv4 address and get a "no route"
(*tcpip.ErrNoRoute) error from netstack's dialer.

Per https://github.com/tailscale/tailscale/issues/2268#issuecomment-870027626
which is only part of the isuse.

Updates #2268

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-06-28 15:20:37 -07:00
Brad Fitzpatrick
b92e2ebd24 wgengine/netstack: add Impl.DialContextUDP
Unused so far, but eventually we'll want this for SOCKS5 UDP binds (we
currently only do TCP with SOCKS5), and also for #2102 for forwarding
MagicDNS upstream to Tailscale IPs over netstack.

Updates #2102

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-06-23 22:12:17 -07:00
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>
2021-05-16 14:52:00 -07:00
Brad Fitzpatrick
5b52b64094 tsnet: add Tailscale-as-a-library package
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-05-14 12:46:42 -07:00
Brad Fitzpatrick
b8fb8264a5 wgengine/netstack: avoid delivering incoming packets to both netstack + host
The earlier eb06ec172f fixed
the flaky SSH issue (tailscale/corp#1725) by making sure that packets
addressed to Tailscale IPs in hybrid netstack mode weren't delivered
to netstack, but another issue remained:

All traffic handled by netstack was also potentially being handled by
the host networking stack, as the filter hook returned "Accept", which
made it keep processing. This could lead to various random racey chaos
as a function of OS/firewalls/routes/etc.

Instead, once we inject into netstack, stop our caller's packet
processing.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-05-06 06:43:16 -07:00
Brad Fitzpatrick
eb06ec172f wgengine/netstack: don't pass non-subnet traffic to netstack in hybrid mode
Fixes tailscale/corp#1725

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-05-05 13:38:55 -07:00
Josh Bleecher Snyder
eb2a9d4ce3 wgengine/netstack: log error when acceptUDP fails
I see a bunch of these in some logs I'm looking at,
separated only by a few seconds.
Log the error so we can tell what's going on here.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-04-21 12:25:01 -07:00
Naman Sood
4a90a91d29
wgengine/netstack: log ForwarderRequest in readable form, only in debug mode (#1758)
* wgengine/netstack: log ForwarderRequest in readable form, only in debug mode

Fixes #1757

Signed-off-by: Naman Sood <mail@nsood.in>
2021-04-21 14:50:48 -04:00
Brad Fitzpatrick
d488678fdc cmd/tailscaled, wgengine{,/netstack}: add netstack hybrid mode, add to Windows
For #707

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-04-06 21:37:28 -07:00
Naman Sood
31c7745631
wgengine/netstack: stop re-adding IPs registered by active TCP connections (#1629)
Signed-off-by: Naman Sood <mail@nsood.in>
2021-03-31 15:32:33 -04:00
Naman Sood
662fbd4a09
wgengine/netstack: Allow userspace networking mode to expose subnets (#1588)
wgengine/netstack: Allow userspace networking mode to expose subnets

Updates #504

Updates #707

Signed-off-by: Naman Sood <mail@nsood.in>
2021-03-29 14:33:05 -04:00
David Anderson
016de16b2e net/tstun: rename TUN to Wrapper.
The tstun packagen contains both constructors for generic tun
Devices, and a wrapper that provides additional functionality.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-26 23:15:22 -07:00
David Anderson
588b70f468 net/tstun: merge in wgengine/tstun.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-26 22:31:54 -07:00
Brad Fitzpatrick
e2b3d9aa5f all: s/Magic DNS/MagicDNS/ for consistency
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-23 14:25:28 -07:00
Brad Fitzpatrick
aa79a57f63 wgengine/netstack: use inet.af/netstack, remove 64-bit only limitation
This reverts the revert commit 84aba349d9.

And changes us to use inet.af/netstack.

Updates #1518

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-17 22:46:09 -07:00
David Anderson
84aba349d9 Revert "wgengine/netstack: update gvisor to remove 64-bit only limitation"
Breaks our corp repo due to gRPC dependency hell.

This reverts commit d42f8b7f9a.
2021-03-16 15:36:06 -07:00
Brad Fitzpatrick
d42f8b7f9a wgengine/netstack: update gvisor to remove 64-bit only limitation
gVisor fixed their google/gvisor#1446 so we can include gVisor mode
on 32-bit machines.

A few minor upstream API changes, as normal.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-15 21:02:51 -07:00
Naman Sood
770aa71ffb client, cmd/hello, ipn, wgengine: fix whois for netstack-forwarded connections
Updates #504

Updates #707

Signed-off-by: Naman Sood <mail@nsood.in>
2021-03-15 18:14:09 -04:00
Naman Sood
4c80344e27 wgengine/netstack: stop UDP forwarding when one side dies
Updates #504

Updates #707

Signed-off-by: Naman Sood <mail@nsood.in>
2021-03-08 13:59:37 -05:00
Naman Sood
7325b5a7ba wgengine/netstack: add support for incoming UDP connections
Updates #504

Updates #707

Signed-off-by: Naman Sood <mail@nsood.in>
2021-03-08 13:27:27 -05:00
Brad Fitzpatrick
f858b0d25f wgengine/netstack: remove some v2 logging by default
Even with [v2], it still logtails and takes time to format.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-03 10:37:06 -08:00
Naman Sood
d01c60dad5 wgengine/netstack: use system dialer to contact servers on localhost
Updates #504

Updates #707

Signed-off-by: Naman Sood <mail@nsood.in>
2021-03-03 13:27:50 -05:00
Naman Sood
95c03d1ead wgengine/netstack: forward incoming connections to localhost
Updates #707
Updates #504

Signed-off-by: Naman Sood <mail@nsood.in>
2021-03-02 15:26:40 -05:00