564 Commits (8d6793fd7047d1c9b59e939e7644edbb75b4790f)

Author	SHA1	Message	Date
Brad Fitzpatrick	d413850bd7	cmd/tailscale: add "debug via" subcommand to do CIDR math for via ranges ... $ tailscale debug via 0xb 10.2.0.0/16 fd7a:115c:a1e0:b1a:0🅱️a02:0/112 $ tailscale debug via fd7a:115c:a1e0:b1a:0🅱️a02:0/112 site 11 (0xb), 10.2.0.0/16 Previously: 3ae701f0eb This adds a little debug tool to do CIDR math to make converting between those ranges easier for now. Updates #3616 Change-Id: I98302e95d17765bfaced3ecbb71cbd43e84bff46 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Tom DNetto	c8f4dfc8c0	derp/derphttp,net/netcheck: improve netcheck behavior under MITM proxies ... In cases where tailscale is operating behind a MITM proxy, we need to consider that a lot more of the internals of our HTTP requests are visible and may be used as part of authorization checks. As such, we need to 'behave' as closely as possible to ideal. - Some proxies do authorization or consistency checks based the on Host header or HTTP URI, instead of just the IP/hostname/SNI. As such, we need to construct a `*http.Request` with a valid URI everytime HTTP is going to be used on the wire, even if its over TLS. Aside from the singular instance in net/netcheck, I couldn't find anywhere else a http.Request was constructed incorrectly. - Some proxies may deny requests, typically by returning a 403 status code. We should not consider these requests as a valid latency check, so netcheck semantics have been updated to consider >299 status codes as a failed probe. Signed-off-by: Tom DNetto <tom@tailscale.com>	3 years ago
Brad Fitzpatrick	cc575fe4d6	net/dns: schedule DoH upgrade explicitly, fix Resolver.Addr confusion ... Two changes in one: * make DoH upgrades an explicitly scheduled send earlier, when we come up with the resolvers-and-delay send plan. Previously we were getting e.g. four Google DNS IPs and then spreading them out in time (for back when we only did UDP) but then later we added DoH upgrading at the UDP packet layer, which resulted in sometimes multiple DoH queries to the same provider running (each doing happy eyeballs dialing to 4x IPs themselves) for each of the 4 source IPs. Instead, take those 4 Google/Cloudflare IPs and schedule 5 things: first the DoH query (which can use all 4 IPs), and then each of the 4 IPs as UDP later. * clean up the dnstype.Resolver.Addr confusion; half the code was using it as an IP string (as documented) as half was using it as an IP:port (from some prior type we used), primarily for tests. Instead, document it was being primarily an IP string but also accepting an IP:port for tests, then add an accessor method on it to get the IPPort and use that consistently everywhere. Change-Id: Ifdd72b9e45433a5b9c029194d50db2b9f9217b53 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	e3a4952527	net/dns/resolver: count errors when racing DNS queries, fail earlier ... If all N queries failed, we waited until context timeout (in 5 seconds) to return. This makes (*forwarder).forward fail fast when the network's unavailable. Change-Id: Ibbb3efea7ed34acd3f3b29b5fee00ba8c7492569 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	d9efbd97cb	net/dns: remove an unused function ... Change-Id: I7c920c76223ffac37954ef2a18754afc52177598 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	ecea6cb994	net/dns/resolver: make DoH dialer use existing dnscache happy eyeball dialer ... Simplify the ability to reason about the DoH dialing code by reusing the dnscache's dialer we already have. Also, reduce the scope of the "ip" variable we don't want to close over. This necessarily adds a new field to dnscache.Resolver: SingleHostStaticResult, for when the caller already knows the IPs to be returned. Change-Id: I9f2aef7926f649137a5a3e63eebad6a3fffa48c0 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	f4f76eb275	net/dnsfallback: update from 'go generate' ... Change-Id: I93e0e6d9a4a471953c1ffef07f32605c5724aed8 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
phirework	52d32c94d8	net/dns/publicdns: add missing call to sync.Once.Do (#4410) ... Signed-off-by: Jenny Zhang <jz@tailscale.com>	3 years ago
phirework	83c734a6e0	net/dns, util/publicdns: extract public DNS mapping into own package (#4405) ... This extracts DOH mapping of known public DNS providers in forwarder.go into its own package, to be consumed by other repos Signed-off-by: Jenny Zhang <jz@tailscale.com>	3 years ago
Brad Fitzpatrick	a49d8d5200	Revert ".github/workflows: work around golang/go#51629" ... This reverts commit 2a412ac9ee. Updates #4194 Change-Id: I0098b66b71d20bea301ca79058c1cdd201237dd0 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	3ae701f0eb	net/tsaddr, wgengine/netstack: add IPv6 range that forwards to site-relative IPv4 ... This defines a new magic IPv6 prefix, fd7a:115c:a1e0:b1a::/64, a subset of our existing /48, where the final 32 bits are an IPv4 address, and the middle 32 bits are a user-chosen "site ID". (which must currently be 0000:00xx; the top 3 bytes must be zero for now) e.g., I can say my home LAN's "site ID" is "0000:00bb" and then advertise its 10.2.0.0/16 IPv4 range via IPv6, like: tailscale up --advertise-routes=fd7a:115c:a1e0:b1a::bb:10.2.0.0/112 (112 being /128 minuse the /96 v6 prefix length) Then people in my tailnet can: $ curl '[fd7a:115c:a1e0:b1a::bb:10.2.0.230]' <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" .... Updates #3616, etc RELNOTE=initial support for TS IPv6 addresses to route v4 "via" specific nodes Change-Id: I9b49b6ad10410a24b5866b9fbc69d3cae1f600ef Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Tom	24bdcbe5c7	net/dns, net/dns/resolver, wgengine: refactor DNS request path (#4364) ... * net/dns, net/dns/resolver, wgengine: refactor DNS request path Previously, method calls into the DNS manager/resolver types handled DNS requests rather than DNS packets. This is fine for UDP as one packet corresponds to one request or response, however will not suit an implementation that supports DNS over TCP. To support PRs implementing this in the future, wgengine delegates all handling/construction of packets to the magic DNS endpoint, to the DNS types themselves. Handling IP packets at this level enables future support for both UDP and TCP. Signed-off-by: Tom DNetto <tom@tailscale.com>	3 years ago
Tom	6be7931eb4	net/dns/resolver: return symbolic PTR records for TS service IPs (#4361) ... Fixes #1233 Signed-off-by: Tom DNetto <tom@tailscale.com> Co-authored-by: Tom DNetto <tom@tailscale.com>	3 years ago
Maisem Ali	309ddef852	net/netutil: add CheckIPForwardingLinux (#4301) ... Combine the code between `LocalBackend.CheckIPForwarding` and `controlclient.ipForwardingBroken`. Fixes #4300 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Brad Fitzpatrick	e4d8d5e78b	net/packet, wgengine/netstack: remove workaround for old gvisor ECN bug ... Fixes #2642 Change-Id: Ic02251d24a4109679645d1c8336e0f961d0cce13 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	753f1bfad4	cmd/tailscale: write fewer known_hosts, resolve ssh host to FQDN early ... Updates #3802 Change-Id: Ic44fa2e6661a9c046e725c04fa6b8213d3d4d2b2 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Maisem Ali	b2f269d5b7	net/dnsfallback: do not attempt lookups of IPs. ... Currently if the passed in host is an IP, Lookup still attempts to resolve it with a dns server. This makes it just return the IP directly. Updates tailscale/corp#4475 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Maisem Ali	b45bb577a0	net/dnscache: do not call LookupIPFallback if the context was canceled. ... When the context is canceled, dc.dialOne returns an error from line 345. This causes the defer on line 312 to try to resolve the host again, which triggers a dns lookup of "127.0.0.1" from derp. Updates tailscale/corp#4475 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Brad Fitzpatrick	b647977b33	net/netutil: move some net utils from control/controlhttp to netutil ... In prep for reuse elsewhere. Change-Id: I1b804edf76ac66b9108e6f434e77eab7a7472d69 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
James Tucker	445c04c938	wgengine: inject packetbuffers rather than bytes (#4220) ... Plumb the outbound injection path to allow passing netstack PacketBuffers down to the tun Read, where they are decref'd to enable buffer re-use. This removes one packet alloc & copy, and reduces GC pressure by pooling outbound injected packets. Fixes #2741 Signed-off-by: James Tucker <james@tailscale.com>	3 years ago
Brad Fitzpatrick	f2041c9088	all: use strings.Cut even more ... Change-Id: I943ce72c6f339589235bddbe10d07799c4e37979 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Aaron Klotz	6e91f872af	net/tshttpproxy: ensure we pass the correct flags to WinHttpOpen on Win7 and Win8.0 ... The best flag to use on Win7 and Win8.0 is deprecated in Win8.1, so we resolve the flag depending on OS version info. Fixes https://github.com/tailscale/tailscale/issues/4201 Signed-off-by: Aaron Klotz <aaron@tailscale.com>	3 years ago
David Anderson	2a412ac9ee	.github/workflows: work around golang/go#51629 ... Incidentally, simplify the go generate CI workflow, by marking the dnsfallback update non-hermetic (so CI will skip it) rather than manually filter it out of `go list`. Updates #4194 Signed-off-by: David Anderson <danderson@tailscale.com>	3 years ago
Josh Bleecher Snyder	0868329936	all: use any instead of interface{} ... My favorite part of generics. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Brad Fitzpatrick	61ee72940c	all: use Go 1.18's strings.Cut ... More remain. Change-Id: I6ec562cc1f687600758deae1c9d7dbd0d04004cb Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Josh Bleecher Snyder	0ef74f37a5	net/dns/resolver: remove closure allocation explanation ... As of Go 1.18, the register ABI list includes arm64, amd64, ppc64, and ppc64le. This is a large enough percentage of the architectures that it's not worth explaining. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Brad Fitzpatrick	61cdcf4082	net/interfaces: add FreeBSD default route lookup (portmapping, etc) ... Updates #4101 (probably fixes) Change-Id: I2b75ee3ced276fb7b211f17c382621cf1ef882fa Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Maisem Ali	2fb087891b	net/socks5: always close client connections after serving ... Customer reported an issue where the connections were not closing, and would instead just stay open. This commit makes it so that we close out the connection regardless of what error we see. I've verified locally that it fixes the issue, we should add a test for this. Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Brad Fitzpatrick	b493ef5b71	net/tsaddr: add func ContainsExitRoutes ... Change-Id: I772441a406083e2fe0f9374b2b23d89aac18928f Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	55095df644	net/interfaces: get Linux default route from netlink as fallback ... If it's in a non-standard table, as it is on Unifi UDM Pro, apparently. Updates #4038 (probably fixes, but don't have hardware to verify) Change-Id: I2cb9a098d8bb07d1a97a6045b686aca31763a937 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Dmytro Shynkevych	d9a7205be5	net/tstun: set link speed to SPEED_UNKNOWN ... Fixes #3933. Signed-off-by: Dmytro Shynkevych <dm.shynk@gmail.com>	3 years ago
Brad Fitzpatrick	7d897229d9	net/dns: ignore permission errors on Synology DSM7 for now ... Updates #4017 Change-Id: Ia7fd4df47588c010dea8e63d88f397cc8eb748e5 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	bb94561c96	net/netutil: fix regression where peerapi would get closed after 1st req ... I introduced a bug in 8fe503057d when unifying oneConnListener implementations. The NewOneConnListenerFrom API was easy to misuse (its Close method closes the underlying Listener), and we did (via http.Serve, which closes the listener after use, which meant we were close the peerapi's listener, even though we only wanted its Addr) Instead, combine those two constructors into one and pass in the Addr explicitly, without delegating through to any Listener. Change-Id: I061d7e5f842e0cada416e7b2dd62100d4f987125 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	2ff481ff10	net/dns: add health check for particular broken-ish Linux DNS config ... Updates #3937 (need to write docs before closing) Change-Id: I1df7244cfbb0303481e2621ee750d21358bd67c6 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	c988bd6ed1	net/dns/resolvconffile: unify three /etc/resolv.conf parsers into new package ... Change-Id: I2120893ca802d12f1bd0407d49077d3672627d33 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	8d6cf14456	net/dnscache: don't do bootstrap DNS lookup after most failed dials ... If we've already connected to a certain name's IP in the past, don't assume the problem was DNS related. That just puts unnecessarily load on our bootstrap DNS servers during regular restarts of Tailscale infrastructure components. Also, if we do do a bootstrap DNS lookup and it gives the same IP(s) that we already tried, don't try them again. Change-Id: I743e8991a7f957381b8e4c1508b8e9d0df1782fe Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	903988b392	net/dnscache: refactor from func-y closure-y state to types & methods ... No behavior changes (intended, at least). This is in prep for future changes to this package, which would get too complicated in the current style. Change-Id: Ic260f8e34ae2f64f34819d4a56e38bee8d8ac5ce Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	8267ea0f80	net/tstun: remove TODO that's done ... This TODO was both added and fixed in 506c727e3. As I recall, I wasn't originally going to do it because it seemed annoying, so I wrote the TODO, but then I felt bad about it and just did it, but forgot to remove the TODO. Change-Id: I8f3514809ad69b447c62bfeb0a703678c1aec9a3 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	8fe503057d	net/netutil: unify two oneConnListeners into a new package ... I was about to add a third copy, so unify them now instead. Change-Id: I3b93896aa1249b1250a6b1df4829d57717f2311a Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	21358cf2f5	net/dns: slightly optimize dbusPing for non-dbus case [Linux] ... Avoid some work when D-Bus isn't running. Change-Id: I6f89bb75fdb24c13f61be9b400610772756db1ef Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	37e7a387ff	net/dns: remove some unused code for detecting systemd-resolved [Linux] ... Change-Id: I19c5fd2cdacfb9e5b688ccd9b4336ae4edffc445 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	15599323a1	net/dns: fix systemd-resolved detection race at boot ... If systemd-resolved is enabled but not running (or not yet running, such as early boot) and resolv.conf is old/dangling, we weren't detecting systemd-resolved. This moves its ping earlier, which will trigger it to start up and write its file. Updates #3362 (likely fixes) Updates #3531 (likely fixes) Change-Id: I6392944ac59f600571c43b8f7a677df224f2beed Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Denton Gentry	dbea8217ac	net/dns: add NetworkManager regression test ... Use the exact /etc/resolv.conf file from a user report. Updates https://github.com/tailscale/tailscale/issues/3531 Signed-off-by: Denton Gentry <dgentry@tailscale.com>	3 years ago
Brad Fitzpatrick	2a67beaacf	net/interfaces: bound Linux /proc/net/route parsing ... tailscaled was using 100% CPU on a machine with ~1M lines, 100MB+ of /proc/net/route data. Two problems: in likelyHomeRouterIPLinux, we didn't stop reading the file once we found the default route (which is on the first non-header line when present). Which meant it was finding the answer and then parsing 100MB over 1M lines unnecessarily. Second was that if the default route isn't present, it'd read to the end of the file looking for it. If it's not in the first 1,000 lines, it ain't coming, or at least isn't worth having. (it's only used for discovering a potential UPnP/PMP/PCP server, which is very unlikely to be present in the environment of a machine with a ton of routes) Change-Id: I2c4a291ab7f26aedc13885d79237b8f05c2fd8e4 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Aaron Bieber	e5cd765e00	net/dns/resolvd: properly handle not having "search" entries ... This prevents adding an empty "search" line when no search domains are set. Signed-off-by: Aaron Bieber <aaron@bolddaemon.com>	3 years ago
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>	3 years ago
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>	3 years ago
Brad Fitzpatrick	6feb8f4c51	net/dns: log why resolved does not look like it's on use [Linux] ... Updates #3742 Updates #3531 Change-Id: I9fc7fa0f4bcab1cf8001ba92408c660a5b25f105 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Aaron Bieber	411c6c316c	net/dns/resolvd: store nameservers ... Currently only search domains are stored. This was an oversight (under?) on my part. As things are now, when MagicDNS is on and "Override local DNS" is off, the dns forwarder has to timeout before names resolve. This introduces a pretty annoying lang that makes everything feel extremely slow. You will also see an error: "upstream nameservers not set". I tested with "Override local DNS" on and off. In both situations things seem to function as expected (and quickly). Signed-off-by: Aaron Bieber <aaron@bolddaemon.com>	3 years ago
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>	3 years ago