240 Commits (6f590f5b528a99e703b484c18d30d0194c06401c)

Author	SHA1	Message	Date
David Anderson	e16f7e48a3	wgengine: simplify wgcfg.* to netaddr.* conversion. ... Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
David Anderson	ccbd0937d0	wgengine: avoid v6 mapped v4 IPs when converting to netaddr types. ... Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
Wendi Yu	499c8fcbb3	Replace our ratelimiter with standard rate package (#359) ... * Replace our ratelimiter with standard rate package Signed-off-by: Wendi Yu <wendi.yu@yahoo.ca>	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	89af51b84d	wgengine: plumb locally advertised subnet routes. ... With this change, advertising subnet routes configures the firewall correctly. 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
Brad Fitzpatrick	fefd7e10dc	types/structs: add structs.Incomparable annotation, use it where applicable ... Shotizam before and output queries: sqlite> select sum(size) from bin where func like 'type..%'; 129067 => 120216	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
Avery Pennarun	ee3395e63a	wgengine/filter: fix linter warning. ... Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>	5 years ago
Avery Pennarun	65fbb9c303	wgengine/filter: support subnet mask rules, not just /32 IPs. ... This depends on improved support from the control server, to send the new subnet width (Bits) fields. If these are missing, we fall back to assuming their value is /32. Conversely, if the server sends Bits fields to an older client, it will interpret them as /32 addresses. Since the only rules we allow are "accept" rules, this will be narrower or equal to the intended rule, so older clients will simply reject hosts on the wider subnet (fail closed). With this change, the internal filter.Matches format has diverged from the wire format used by controlclient, so move the wire format into tailcfg and convert it to filter.Matches in controlclient. Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>	5 years ago
Avery Pennarun	85e675940d	wgengine/filter: allow ICMP response packets. ... Longer term, we should probably update the packet filter to be fully stateful, for both TCP and ICMP. That is, only ICMP packets related to a session *we* initiated should be allowed back in. But this is reasonably secure for now, since wireguard is already trimming most traffic. The current code would not protect against eg. Ping-of-Death style attacks from VPN nodes. Fixes tailscale/tailscale#290. Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>	5 years ago
Brad Fitzpatrick	e1526b796e	ipn: don't listen on the unspecified address in test ... To avoid the Mac firewall dialog of (test) death. See 4521a59f30 which I added to help debug this.	5 years ago
Brad Fitzpatrick	18017f7630	ipn, wgengine/magicsock: be more idle when in Stopped state with no peers ... (Previously as #288, but with some more.) Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
fgergo	8296c934ac	Update ifconfig_windows.go ... OLE calls sometimes unexpectedly fail, but retries can succeed. Change panic() to return errors. This way ConfigureInterface() retries can succeed.	5 years ago
David Anderson	9669b85b41	wgengine/magicsock: wait for endpoint updater goroutine when closing. ... Fixes #204. Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
Elias Naur	2dac4f2b24	wgengine/monitor: disable monitor on Android ... Netlink is not supported on Android. Signed-off-by: Elias Naur <mail@eliasnaur.com>	5 years ago
Brad Fitzpatrick	268d331cb5	wgengine/magicsock: prune key.Public-keyed on peer removals ... Fixes #215	5 years ago
Brad Fitzpatrick	00d053e25a	wgengine/magicsock: fix slow memory leak as peer endpoints move around ... Updates #215	5 years ago
Brad Fitzpatrick	7fc97c5493	wgengine/magicsock: use netaddr more ... In prep for deleting from the ever-growing maps.	5 years ago
Brad Fitzpatrick	6fb30ff543	wgengine/magicsock: start using inet.af/netaddr a bit	5 years ago
David Anderson	afbfe4f217	wgengine: drop wireguard MTU to 1280 bytes. ... Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
Avery Pennarun	dc9b39e3fb	wgengine/windows: use new winipcfg.Sync{Addresses,Routes} functions. ... This avoids flushing and reloading the whole list of addresses and routes whenever remote node information changes.	5 years ago
Brad Fitzpatrick	adf74c75ed	wgengine: also diagnose not-yet-rebooted system updates on Arch	5 years ago
Brad Fitzpatrick	45f2b53aca	all: remove unnecessary trailing newlines in format patterns for consistency ... And document on logger.Logf that it's unnecessary.	5 years ago
Brad Fitzpatrick	a7e7c7b548	wgengine/magicsock: close derp connections on rebind ... Fixes #276 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	614261d00d	wgengine/magicsock: reset AddrSet states on Rebind ... Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	c0697e1feb	net/interfaces: add IsExpensive and up state to State ... Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	a55c4217db	wgengine: diagnose why CreateTUN might've failed for users ... Fixes #273 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	3a3b64301e	wgengine: quiet some engine reconfig logging, make more consistent ... Updates #282 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	1ec27dbb5b	wgengine: remove an allocation in reconfig ... Minor.	5 years ago
David Crawshaw	5b95aa81ea	wgengine: remove IpcSetOperation on LinkChange ... This was only done occasionally, but was extremely disruptive when done and is no longer necessary. It used to be that when switching links, we had to immediately generate handshakes to everyone we were communicating with to punch a hole in any NAT we were talking through. (This ended up not really working, because in the process we got rid of our session keys and ended up having a futile conversation for many seconds.) Now we have DERP, our link change propogates to the other side as a new list of endpoints, so they start spraying packets. We will definitely get one thanks to DERP, which will cause us to spray, opening any NAT we are behind. The result is that for good connections, we don't trash session keys and cause an interruption. Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	5 years ago
Brad Fitzpatrick	922d9546bf	wgengine: don't allocate so much in userspaceEngine.getStatus ... It was one of the top garbage producers on my phone. It's slated to be deleted and replaced anyway, but this helps in the meantime. The go.sum changes look scary, but the new dep only adds 240 bytes to the binary. The go.sum noise is just cmd/go being aggressive in including a lot of stuff (which is being fixed in Go 1.15, for what I understand). And I ran a go mod tidy, which added some too. (I had to write a custom wrapper around go mod tidy because this mod tidy normally breaks on tailscale.io/control being missing but referenced in tests) Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	0f64d7f9cc	wgengine: remove a tiny allocation ... Drop in the bucket compared to the larger issues, but noticed it when looking at pprof.	5 years ago
Blake Gentry	e19287f60f	wgengine/magicsock: fix Conn docs type reference ... The docs on magicsock.Conn stated that they implemented the wireguard/device.Bind interface, yet this type does not exist. In reality, the Conn type implements the wireguard/conn.Bind interface. I also fixed a small typo in the same file. Signed-off-by: Blake Gentry <blakesgentry@gmail.com>	5 years ago
Brad Fitzpatrick	50aeb5b9ad	wgengine: unexport some windows funcs	5 years ago
Brad Fitzpatrick	322499473e	cmd/tailscaled, wgengine, ipn: add /debug/ipn handler with world state ... Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	2d48f92a82	wgengine/magicsock: re-stun every [20,27] sec, not 28 ... 28 is cutting it close, and we think jitter will help some spikes we're seeing. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	577f321c38	wgengine/magicsock: revise derp fallback logic ... Revision to earlier 6284454ae5 Don't be sticky if we have no peers. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	2e420ad8b6	wgengine, wgengine/filter: minor doc, style, performance, locking changes ... Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	6284454ae5	wgengine/magicsock: if UDP blocked, pick DERP where most peers are ... Updates #207 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Avery Pennarun	f53e78e0d5	wgengine: don't lose filter state on filter reconfig. ... We were abandoning the UDP port LRU every time we got a new packet filter from tailcontrol, which caused return packets to suddenly stop arriving.	5 years ago
Brad Fitzpatrick	d321190578	wgengine/magicsock: stringify [IPv6]:port normally in AddrSet.String	5 years ago
Brad Fitzpatrick	3c3ea8bc8a	wgengine/magicsock: finish IPv6 transport support ... DEBUG_INCLUDE_IPV6=1 is still required, but works now. Updates #18 (fixes it, once env var gate is removed)	5 years ago
Brad Fitzpatrick	82ed7e527e	wgengine/magicsock: remove log allocation ... This was the whole point but I goofed at the last line.	5 years ago
Brad Fitzpatrick	8454bbbda5	wgengine/magicsock: more logging improvements ... * remove endpoint discovery noise when results unchanged * consistently spell derp nodes as "derp-N" * replace "127.3.3.40:" with "derp-" in CreateEndpoint log output * stop early DERP setup before SetPrivateKey is called; it just generates log nosie * fix stringification of peer ShortStrings (it had an old %x on it, rendering it garbage) * describe why derp routes are changing, with one of: shared home, their home, our home, alt	5 years ago
Brad Fitzpatrick	680311b3df	wgengine/magicsock: fix few remaining logs without package prefix	5 years ago
Brad Fitzpatrick	c473927558	wgengine/magicsock: clean up, add, improve DERP logs	5 years ago
Brad Fitzpatrick	ea9310403d	wgengine/magicsock: re-STUN on DERP connection death ... Fixes #201	5 years ago
Brad Fitzpatrick	1ab5b31c4b	derp, magicsock: send new "peer gone" frames when previous sender disconnects ... Updates #150 (not yet enabled by default in magicsock) Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	b6f77cc48d	wgengine/magicsock: return early, outdent in derpWriteChanOfAddr	5 years ago
Brad Fitzpatrick	dd31285ad4	wgengine/magicsock: send IPv6 using pconn6, if available ... In prep for IPv6 support. Nothing should make it this far yet.	5 years ago
Brad Fitzpatrick	af277a6762	controlclient, magicsock: add debug knob to request IPv6 endpoints ... Add opt-in method to request IPv6 endpoints from the control plane. For now they should just be skipped. A previous version of this CL was unconditional and reportedly had problems that I can't reproduce. So make it a knob until the mystery is solved. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	221e7d7767	wgengine/magicsock: make log message include DERP port (node)	5 years ago
Brad Fitzpatrick	33bdcabf03	wgengine/magicsock: call stun callback w/ only valid part of STUN packet	5 years ago
David Anderson	0be475ba46	Revert "tailcfg, controlclient, magicsock: request IPv6 endpoints, but ignore them" ... Breaks something deep in wireguard or magicsock's brainstem, no packets at all can flow. All received packets fail decryption with "invalid mac1". This reverts commit 94024355ed. Signed-off-by: David Anderson <dave@natulte.net>	5 years ago
Brad Fitzpatrick	94024355ed	tailcfg, controlclient, magicsock: request IPv6 endpoints, but ignore them ... Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	60ea635c6d	wgengine/magicsock: delete inaccurate comment ... I meant to include this in the earlier commit.	5 years ago
Brad Fitzpatrick	a184e05290	wgengine/magicsock: listen on udp6, use it for STUN, report endpoint ... More steps towards IPv6 transport. We now send it to tailcontrol, which ignores it. But it doesn't actually actually support IPv6 yet (outside of STUN). Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	7caa288213	wgengine/magicsock: rename pconn field to pconn4, in prep for pconn6	5 years ago
David Crawshaw	addbdce296	wgengine, ipn: include number of active DERPs in status ... Use this when making the ipn state transition from Starting to Running. This way a network of quiet nodes with no active handshaking will still transition to Active. Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	5 years ago
David Crawshaw	1ad78ce698	magicsock: reconnect to home DERP on key change ... Typically the home DERP server is found and set on startup before magicsock's SetPrivateKey can be called, so no DERP connection is established. Make sure one is by kicking the home DERP tires in SetPrivateKey. Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	5 years ago
David Crawshaw	455ba751d9	magicsock: start connection to HOME derp immediately ... The code as written intended to do this, but it repeated the comparison of derpNum and c.myDerp after c.myDerp had been updated, so it never executed. Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	5 years ago
David Anderson	315a5e5355	scripts: add a license header checker. ... Signed-off-by: David Anderson <dave@natulte.net>	5 years ago
Brad Fitzpatrick	e085aec8ef	all: update to wireguard-go API changes ... Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	db2436c7ff	wgengine/magicsock: don't interrupt endpoint updates, merge all mutex into one ... Before, endpoint updates were constantly being interrupted and resumed on Linux due to tons of LinkChange messages from over-zealous Linux netlink messages (from router_linux.go) Now that endpoint updates are fast and bounded in time anyway, just let them run to completion, but note that another needs to be scheduled after. Now logs went from pages of noise to just: root@taildoc:~# grep -i -E 'stun|endpoint update' log 2020/03/13 08:51:29 magicsock.Conn: starting endpoint update (initial) 2020/03/13 08:51:30 magicsock.Conn.ReSTUN: endpoint update active, need another later ("link-change-minor") 2020/03/13 08:51:31 magicsock.Conn: starting endpoint update (link-change-minor) 2020/03/13 08:51:31 magicsock.Conn.ReSTUN: endpoint update active, need another later ("link-change-minor") 2020/03/13 08:51:33 magicsock.Conn: starting endpoint update (link-change-minor) 2020/03/13 08:51:33 magicsock.Conn.ReSTUN: endpoint update active, need another later ("link-change-minor") 2020/03/13 08:51:35 magicsock.Conn: starting endpoint update (link-change-minor) 2020/03/13 08:51:35 magicsock.Conn.ReSTUN: endpoint update active, need another later ("link-change-minor") Or, seen in another run: 2020/03/13 08:45:41 magicsock.Conn: starting endpoint update (periodic) 2020/03/13 08:46:09 magicsock.Conn: starting endpoint update (periodic) 2020/03/13 08:46:21 magicsock.Conn: starting endpoint update (link-change-major) 2020/03/13 08:46:37 magicsock.Conn: starting endpoint update (periodic) 2020/03/13 08:47:05 magicsock.Conn: starting endpoint update (periodic) Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	db31550854	wgengine: don't Reconfig on boring link changes ... Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	b9c6d3ceb8	netcheck: work behind UDP-blocked networks again, add tests ... Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	bc73dcf204	wgengine/magicsock: don't block in Send waiting for derphttp.Send ... Fixes #137 Updates #109 Updates #162 Updates #163 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	8807913be9	wgengine/magicsock: wait for previous DERP goroutines to end before new ones ... Updates #109 (hopefully fixes, will wait for graphs to be happy) Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	eff6dcdb4e	wgengine/magicsock: log more about why we're re-STUNing	5 years ago
Brad Fitzpatrick	b3ddf51a15	wgengine/magicsock: add a pointer value for logging ... Updates #109 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	b0f8931d26	wgengine/magicsock: make a test signature a bit more explicit	5 years ago
David Crawshaw	7ec54e0064	wgengine/magicsock: remove TODO ... The TODO above derphttp.NewClient suggests it does network I/O, but the derphttp client connects lazily and so creating one is very cheap. Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	5 years ago
Brad Fitzpatrick	01b4bec33f	stunner: re-do how Stunner works ... It used to make assumptions based on having Anycast IPs that are super near. Now we're intentionally going to a bunch of different distant IPs to measure latency. Also, optimize how the hairpin detection works. No need to STUN on that socket. Just use that separate socket for sending, once we know the other UDP4 socket's endpoint. The trick is: make our test probe also a STUN packet, so it fits through magicsock's existing STUN routing. This drops netcheck from ~5 seconds to ~250-500ms. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
David Anderson	77af7e5436	wgengine/magicsock: mark test logfunc as a helper. ... Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
David Anderson	7eda3af034	wgengine/magicsock: clean up derp http servers on shutdown. ... Failure to do this leads to fd exhaustion at -count=10000, and increasingly poor execution north of -count=100. Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
David Anderson	d651715528	wgengine/magicsock: synchronize test STUN shutdown. ... Failure to do so triggers either a data race or a panic in the testing package, due to racey use of t.Logf. Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
David Anderson	86baf60bd4	wgengine/magicsock: synchronize epUpdate cleanup on shutdown. ... Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
Brad Fitzpatrick	023df9239e	Move linkstate boring change filtering to magicsock ... So we can at least re-STUN on boring updates. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
David Anderson	592fec7606	wgengine/magicsock: move device close to uncursed portion of test. ... Device close used to suffer from deadlocks, but no longer. Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
Brad Fitzpatrick	a265d7cbff	wgengine/magicsock: in STUN-disabled test mode, let endpoint discovery proceed	5 years ago
Brad Fitzpatrick	5c1e443d34	wgengine/monitor: don't call LinkChange when interfaces look unchanged ... Basically, don't trust the OS-level link monitor to only tell you interesting things. Sanity check it. Also, move the interfaces package into the net directory now that we have it.	5 years ago
Brad Fitzpatrick	39c0ae1dba	derp/derpmap: new DERP config package, merge netcheck into magicsock more ... Fixes #153 Updates #162 Updates #163 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	4800926006	wgengine/magicsock: add AddrSet appendDests+UpdateDst tests	5 years ago
David Crawshaw	e201f63230	magicsock: unskip tests that are reliable ... Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	5 years ago
David Crawshaw	0f73070a57	wgengine: shut down wireguard on Close ... This was (presumably) missing from wgengine because the interactions between magicsock and wireguard-go meant that the shutdown never worked. Now those are fixed, actually shut down. Fixes occasional flake in expanded ipn/e2e_test. Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	5 years ago
David Crawshaw	ce7f6b2df1	wgengine: have pinger use all single-IP routes ... Fixes #139 Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	5 years ago
Martin Baillie	8ae3ba0cf5	wgengine: define default tunname for each platform ... The device name "tailscale0" will be used for all platforms except for OpenBSD where "tun" is enforced by the kernel. `CreateTUN()` in `wireguard-go` will select the next available "tunX" device name on the OpenBSD system. Signed-off-by: Martin Baillie <martin@baillie.email>	5 years ago
David Anderson	bb93d7aaba	wgengine/magicsock: plumb logf throughout, and expose in Options. ... Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
Brad Fitzpatrick	f42b9b6c9a	wgengine/magicsock: don't discard UDP packet on UDP+DERP race ... Fixes #155 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
David Anderson	e3172ae267	wgengine/magicsock: uncurse TestDeviceStartStop, let CI run it. ... Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
David Anderson	f265603110	wgengine/magicsock: fix data race in ReceiveIPv4. ... The UDP reader goroutine was clobbering `n` and `err` from the main goroutine, whose accesses are not synchronized the way `b` is. Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
David Anderson	77354d4617	wgengine/magicsock: unblock wireguard-go's read on magicsock shutdown. ... wireguard-go closes magicsock, and expects this to unblock reads so that its internal goroutines can wind down. We were incorrectly blocking the read indefinitey and breaking this contract. Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago