947 Commits (a7f65b40c57c5b0c55762d9caff6227a5985549e)

Author	SHA1	Message	Date
Andrew Dunham	20f3f706a4	net/netutil: allow 16-bit 4via6 site IDs ... The prefix has space for 32-bit site IDs, but the validateViaPrefix function would previously have disallowed site IDs greater than 255. Fixes tailscale/corp#16470 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I4cdb0711dafb577fae72d86c4014cf623fa538ef	10 months ago
James Tucker	953fa80c6f	cmd/{derper,stund},net/stunserver: add standalone stun server ... Add a standalone server for STUN that can be hosted independently of the derper, and factor that back into the derper. Fixes #8434 Closes #8435 Closes #10745 Signed-off-by: James Tucker <james@tailscale.com>	10 months ago
Andrew Dunham	35c303227a	net/dns/resolver: add ID to verbose logs in forwarder ... To make it easier to correlate the starting/ending log messages. Updates #cleanup Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I2802d53ad98e19bc8914bc58f8c04d4443227b26	10 months ago
Andrea Gottardo	d9aeb30281	net/interfaces: handle iOS network transitions (#10680) ... Updates #8022 Updates #6075 On iOS, we currently rely on delegated interface information to figure out the default route interface. The NetworkExtension framework in iOS seems to set the delegate interface only once, upon the *creation* of the VPN tunnel. If a network transition (e.g. from Wi-Fi to Cellular) happens while the tunnel is connected, it will be ignored and we will still try to set Wi-Fi as the default route because the delegated interface is not getting updated as connectivity transitions. Here we work around this on the Swift side with a NWPathMonitor instance that observes the interface name of the first currently satisfied network path. Our Swift code will call into `UpdateLastKnownDefaultRouteInterface`, so we can rely on that when it is set. If for any reason the Swift machinery didn't work and we don't get any updates, here we also have some fallback logic: we try finding a hardcoded Wi-Fi interface called en0. If en0 is down, we fall back to cellular (pdp_ip0) as a last resort. This doesn't handle all edge cases like USB-Ethernet adapters or multiple Ethernet interfaces, but it is good enough to ensure connectivity isn't broken. I tested this on iPhones and iPads running iOS 17.1 and it appears to work. Switching between different cellular plans on a dual SIM configuration also works (the interface name remains pdp_ip0). Signed-off-by: Andrea Gottardo <andrea@tailscale.com>	11 months ago
Andrew Dunham	fa3639783c	net/portmapper: check returned epoch from PMP and PCP protocols ... If the epoch that we see during a Probe is less than the existing epoch, it means that the gateway has either restarted or reset its configuration, and an existing mapping is no longer valid. Reset any saved mapping(s) if we detect this case so that a future createOrGetMapping will not attempt to re-use it. Updates #10597 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: Ie3cddaf625cb94a29885f7a1eeea25dbf6b97b47	11 months ago
Andrew Lytvynov	2716250ee8	all: cleanup unused code, part 2 (#10670) ... And enable U1000 check in staticcheck. Updates #cleanup Signed-off-by: Andrew Lytvynov <awly@tailscale.com>	11 months ago
Nick Khyl	c9836b454d	net/netmon: fix goroutine leak in winMon if the monitor is never started ... When the portable Monitor creates a winMon via newOSMon, we register address and route change callbacks with Windows. Once a callback is hit, it starts a goroutine that attempts to send the event into messagec and returns. The newly started goroutine then blocks until it can send to the channel. However, if the monitor is never started and winMon.Receive is never called, the goroutines remain indefinitely blocked, leading to goroutine leaks and significant memory consumption in the tailscaled service process on Windows. Unlike the tailscaled subprocess, the service process creates but never starts a Monitor. This PR adds a check within the callbacks to confirm the monitor's active status, and exits immediately if the monitor hasn't started. Updates #9864 Signed-off-by: Nick Khyl <nickk@tailscale.com>	11 months ago
Andrew Lytvynov	1302bd1181	all: cleanup unused code, part 1 (#10661) ... Run `staticcheck` with `U1000` to find unused code. This cleans up about a half of it. I'll do the other half separately to keep PRs manageable. Updates #cleanup Signed-off-by: Andrew Lytvynov <awly@tailscale.com>	11 months ago
Andrew Dunham	3c333f6341	net/portmapper: add logs about obtained mapping(s) ... This logs additional information about what mapping(s) are obtained during the creation process, including whether we return an existing cached mapping. Updates #10597 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I9ff25071f064c91691db9ab0b9365ccc5f948d6e	11 months ago
Andrew Dunham	01286af82b	net/interfaces: better handle multiple interfaces in LikelyHomeRouterIP ... Currently, we get the "likely home router" gateway IP and then iterate through all IPs for all interfaces trying to match IPs to determine the source IP. However, on many platforms we know what interface the gateway is through, and thus we don't need to iterate through all interfaces checking IPs. Instead, use the IP address of the associated interface. This better handles the case where we have multiple interfaces on a system all connected to the same gateway, and where the first interface that we visit (as iterated by ForeachInterfaceAddress) isn't also the default internet route. Updates #8992 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I8632f577f1136930f4ec60c76376527a19a47d1f	11 months ago
Andrew Dunham	09136e5995	net/netutil: add function to check rp_filter value (#5703) ... Updates #4432 Change-Id: Ifc332a5747fc1feffdbb87437308cf8ecb21b0b0 Signed-off-by: Andrew Dunham <andrew@du.nham.ca>	11 months ago
Andrew Dunham	d05a572db4	net/portmapper: handle multiple UPnP discovery responses ... Instead of taking the first UPnP response we receive and using that to create port mappings, store all received UPnP responses, sort and deduplicate them, and then try all of them to obtain an external address. Updates #10602 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I783ccb1834834ee2a9ecbae2b16d801f2354302f	11 months ago
Andrew Dunham	727acf96a6	net/netcheck: use DERP frames as a signal for home region liveness ... This uses the fact that we've received a frame from a given DERP region within a certain time as a signal that the region is stil present (and thus can still be a node's PreferredDERP / home region) even if we don't get a STUN response from that region during a netcheck. This should help avoid DERP flaps that occur due to losing STUN probes while still having a valid and active TCP connection to the DERP server. RELNOTE=Reduce home DERP flapping when there's still an active connection Updates #8603 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: If7da6312581e1d434d5c0811697319c621e187a0	11 months ago
Andrew Dunham	bac4890467	net/portmapper: be smarter about selecting a UPnP device ... Previously, we would select the first WANIPConnection2 (and related) client from the root device, without any additional checks. However, some routers expose multiple UPnP devices in various states, and simply picking the first available one can result in attempting to perform a portmap with a device that isn't functional. Instead, mimic what the miniupnpc code does, and prefer devices that are (a) reporting as Connected, and (b) have a valid external IP address. For our use-case, we additionally prefer devices that have an external IP address that's a public address, to increase the likelihood that we can obtain a direct connection from peers. Finally, we split out fetching the root device (getUPnPRootDevice) from selecting the best service within that root device (selectBestService), and add some extensive tests for various UPnP server behaviours. RELNOTE=Improve UPnP portmapping when multiple UPnP services exist Updates #8364 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I71795cd80be6214dfcef0fe83115a5e3fe4b8753	11 months ago
Andrea Barisani	affe11c503	net/netcheck: only run HTTP netcheck for tamago clients ... Signed-off-by: Andrea Barisani <andrea@inversepath.com>	11 months ago
Denton Gentry	137e9f4c46	net/portmap: add test of Mikrotik Root Desc XML. ... Unfortunately in the test we can't reproduce the failure seen in the real system ("SOAP fault: UPnPError") Updates https://github.com/tailscale/tailscale/issues/8364 Signed-off-by: Denton Gentry <dgentry@tailscale.com>	12 months ago
Andrew Dunham	c4ccdd1bd1	net/interfaces: ensure we return valid 'self' IP in LikelyHomeRouterIP ... Before this fix, LikelyHomeRouterIP could return a 'self' IP that doesn't correspond to the gateway address, since it picks the first private address when iterating over the set interfaces as the 'self' IP, without checking that the address corresponds with the previously-detected gateway. This behaviour was introduced by accident in aaf2df7, where we deleted the following code: for _, prefix := range privatev4s { if prefix.Contains(gateway) && prefix.Contains(ip) { myIP = ip ok = true return } } Other than checking that 'gateway' and 'ip' were private IP addresses (which were correctly replaced with a call to the netip.Addr.IsPrivate method), it also implicitly checked that both 'gateway' and 'ip' were a part of the *same* prefix, and thus likely to be the same interface. Restore that behaviour by explicitly checking pfx.Contains(gateway), which, given that the 'ip' variable is derived from our prefix 'pfx', ensures that the 'self' IP will correspond to the returned 'gateway'. Fixes #10466 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: Iddd2ee70cefb9fb40071986fefeace9ca2441ee6	12 months ago
Aaron Klotz	64a26b221b	net/dns: use an additional registry setting to disable dynamic DNS updates for our interface on Windows ... Fixes #9775 Signed-off-by: Aaron Klotz <aaron@tailscale.com>	12 months ago
Juergen Knaack	c27aa9e7ff	net/dns: fix darwin dns resolver files ... putting each nameserver on one line in /etc/resolver/<domain> fixes: #10134 Signed-off-by: Juergen Knaack <jk@jk-1.de>	12 months ago
Ryan Petris	c4855fe0ea	Fix Empty Resolver Set ... Config.singleResolverSet returns true if all routes have the same resolvers, even if the routes have no resolvers. If none of the routes have a specific resolver, the default should be used instead. Therefore, check for more than 0 instead of nil. Signed-off-by: Ryan Petris <ryan@petris.net>	1 year ago
Andrew Dunham	e33bc64cff	net/dnsfallback: add singleflight to recursive resolver ... This prevents running more than one recursive resolution for the same hostname in parallel, which can use excessive amounts of CPU when called in a tight loop. Additionally, add tests that hit the network (when run with a flag) to test the lookup behaviour. Updates tailscale/corp#15261 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I39351e1d2a8782dd4c52cb04b3bd982eb651c81e	1 year ago
Jordan Whited	12d5c99b04	client/tailscale,ipn/{ipnlocal,localapi}: check UDP GRO config (#10071) ... Updates tailscale/corp#9990 Signed-off-by: Jordan Whited <jordan@tailscale.com>	1 year ago
James Tucker	b48b7d82d0	appc,ipn/ipnlocal,net/dns/resolver: add App Connector wiring when enabled in prefs ... An EmbeddedAppConnector is added that when configured observes DNS responses from the PeerAPI. If a response is found matching a configured domain, routes are advertised when necessary. The wiring from a configuration in the netmap capmap is not yet done, so while the connector can be enabled, no domains can yet be added. Updates tailscale/corp#15437 Signed-off-by: James Tucker <james@tailscale.com>	1 year ago
James Tucker	09fcbae900	net/dnscache: remove completed TODO ... The other IP types don't appear to be imported anymore, and after a scan through I couldn't see any substantial usage of other representations, so I think this TODO is complete. Updates #cleanup Signed-off-by: James Tucker <james@tailscale.com>	1 year ago
Andrew Dunham	57c5b5a77e	net/dns/recursive: update IP for b.root-servers.net ... As of 2023-11-27, the official IP addresses for b.root-servers.net will change to a new set, with the older IP addresses supported for at least a year after that date. These IPs are already active and returning results, so update these in our recursive DNS resolver package so as to be ready for the switchover. See: https://b.root-servers.org/news/2023/05/16/new-addresses.html Fixes #9994 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I29e2fe9f019163c9ec0e62bdb286e124aa90a487	1 year ago
Andrew Dunham	ef596aed9b	net/portmapper: avoid alloc in getUPnPErrorsMetric ... Updates #cleanup Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: Iea558024c038face24cc46584421998d10f13a66	1 year ago
Val	19e5f242e0	net/portmapper: convert UPnP metrics to new syncs.Map.LoadOrInit method ... Simplify UPnP error metrics by using the new syncs.Map.LoadOrInit method. Updates #cleanup Signed-off-by: Val <valerie@tailscale.com>	1 year ago
Brad Fitzpatrick	95faefd1f6	net/dnsfallback: disable recursive resolver for now ... It seems to be implicated in a CPU consumption bug that's not yet understood. Disable it until we understand. Updates tailscale/corp#15261 Change-Id: Ia6d0c310da6464dda79a70fc3c18be0782812d3f Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	1 year ago
Denton Gentry	97ee3891f1	net/dns: use direct when NetworkManager has no systemd-resolved ... Endeavour OS, at least, uses NetworkManager 1.44.2 and does not use systemd-resolved behind the scenes at all. If we find ourselves in that situation, return "direct" not "systemd-resolved" Fixes https://github.com/tailscale/tailscale/issues/9687 Signed-off-by: Denton Gentry <dgentry@tailscale.com>	1 year ago
Maisem Ali	5297bd2cff	cmd/tailscaled,net/tstun: fix data race on start-up in TUN mode ... Fixes #7894 Change-Id: Ice3f8019405714dd69d02bc07694f3872bb598b8 Co-authored-by: Brad Fitzpatrick <bradfitz@tailscale.com> Signed-off-by: Maisem Ali <maisem@tailscale.com>	1 year ago
Maisem Ali	9d96e05267	net/packet: split off checksum munging into different pkg ... The current structure meant that we were embedding netstack in the tailscale CLI and in the GUIs. This removes that by isolating the checksum munging to a different pkg which is only called from `net/tstun`. Fixes #9756 Signed-off-by: Maisem Ali <maisem@tailscale.com>	1 year ago
Galen Guyer	04a8b8bb8e	net/dns: properly detect newer debian resolvconf ... Tailscale attempts to determine if resolvconf or openresolv is in use by running `resolvconf --version`, under the assumption this command will error when run with Debian's resolvconf. This assumption is no longer true and leads to the wrong commands being run on newer versions of Debian with resolvconf >= 1.90. We can now check if the returned version string starts with "Debian resolvconf" if the command is successful. Fixes #9218 Signed-off-by: Galen Guyer <galen@galenguyer.com>	1 year ago
Maisem Ali	78a083e144	types/ipproto: drop IPProto from IPProtoVersion ... Based on https://github.com/golang/go/wiki/CodeReviewComments#package-names. Updates #cleanup Signed-off-by: Maisem Ali <maisem@tailscale.com>	1 year ago
Val	893bdd729c	disco,net/tstun,wgengine/magicsock: probe peer MTU ... Automatically probe the path MTU to a peer when peer MTU is enabled, but do not use the MTU information for anything yet. Updates #311 Signed-off-by: Val <valerie@tailscale.com>	1 year ago
Brad Fitzpatrick	7868393200	net/dns/resolver, ipnlocal: fix ExitDNS on Android and iOS ... Advertise it on Android (it looks like it already works once advertised). And both advertise & likely fix it on iOS. Yet untested. Updates #9672 Change-Id: If3b7e97f011dea61e7e75aff23dcc178b6cf9123 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	1 year ago
Tom DNetto	da1b917575	net/tstun: finish wiring IPv6 NAT support ... Updates https://github.com/tailscale/corp/issues/11202 Updates ENG-991 Signed-off-by: Tom DNetto <tom@tailscale.com>	1 year ago
Andrew Dunham	91b9899402	net/dns/resolver: fix flaky test ... Updates #cleanup Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I2d073220bb6ac78ba88d8be35085cc23b727d69f	1 year ago
Andrew Dunham	286c6ce27c	net/dns/resolver: race UDP and TCP queries (#9544) ... Instead of just falling back to making a TCP query to an upstream DNS server when the UDP query returns a truncated query, also start a TCP query in parallel with the UDP query after a given race timeout. This ensures that if the upstream DNS server does not reply over UDP (or if the response packet is blocked, or there's an error), we can still make queries if the server replies to TCP queries. This also adds a new package, util/race, to contain the logic required for racing two different functions and returning the first non-error answer. Updates tailscale/corp#14809 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I4311702016c1093b1beaa31b135da1def6d86316	1 year ago
Tom DNetto	656a77ab4e	net/packet: implement methods for rewriting v6 addresses ... Implements the ability for the address-rewriting code to support rewriting IPv6 addresses. Specifically, UpdateSrcAddr & UpdateDstAddr. Signed-off-by: Tom DNetto <tom@tailscale.com> Updates https://github.com/tailscale/corp/issues/11202	1 year ago
Val	c26d91d6bd	net/tstun: remove unused function DefaultMTU() ... Now that corp is updated, remove the shim code to bridge the rename from DefaultMTU() to DefaultTUNMTU. Updates #311 Signed-off-by: Val <valerie@tailscale.com>	1 year ago
James Tucker	e03f0d5f5c	net/dnsfallback: remove net/dnsfallback go:generate line ... We should be able to freely run `./tool/go generate ./...`, but we're continually dodging this particular generator. Instead of constantly dodging it, let's just remove it. Updates #cleanup Signed-off-by: James Tucker <james@tailscale.com>	1 year ago
James Tucker	84acf83019	go.mod,net/dnsfallback: bump go4.org/netipx ... Updates #8043 Signed-off-by: James Tucker <james@tailscale.com>	1 year ago
Andrea Barisani	b5b4298325	go.mod,*: bump gvisor ... Updates #9253 Signed-off-by: Andrea Barisani <andrea@inversepath.com> Signed-off-by: James Tucker <james@tailscale.com>	1 year ago
Andrew Dunham	d31460f793	net/portmapper: fix invalid UPnP metric name ... Fixes #9551 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I06f3a15a668be621675be6cbc7e5bdcc006e8570	1 year ago
Val	c608660d12	wgengine,net,ipn,disco: split up and define different types of MTU ... Prepare for path MTU discovery by splitting up the concept of DefaultMTU() into the concepts of the Tailscale TUN MTU, MTUs of underlying network interfaces, minimum "safe" TUN MTU, user configured TUN MTU, probed path MTU to a peer, and maximum probed MTU. Add a set of likely MTUs to probe. Updates #311 Signed-off-by: Val <valerie@tailscale.com>	1 year ago
Andrew Dunham	530aaa52f1	net/dns: retry forwarder requests over TCP ... We weren't correctly retrying truncated requests to an upstream DNS server with TCP. Instead, we'd return a truncated request to the user, even if the user was querying us over TCP and thus able to handle a large response. Also, add an envknob and controlknob to allow users/us to disable this behaviour if it turns out to be buggy (✨ DNS ✨). Updates #9264 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: Ifb04b563839a9614c0ba03e9c564e8924c1a2bfd	1 year ago
Brad Fitzpatrick	241c983920	net/tstun: use untyped consts, simplify DefaultMTU func ... Updates #cleanup Change-Id: Ic9ad1d6134818699f777c66a31024e846dfdc5d4 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	1 year ago
Brad Fitzpatrick	3b32d6c679	wgengine/magicsock, controlclient, net/dns: reduce some logspam ... Updates #cleanup Change-Id: I78b0697a01e94baa33f3de474b591e616fa5e6af Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	1 year ago
Val	6cc5b272d8	Revert "wgengine,net,ipn,disco: split up and define different types of MTU" ... This reverts commit 059051c58a. Signed-off-by: Val <valerie@tailscale.com>	1 year ago
Val	059051c58a	wgengine,net,ipn,disco: split up and define different types of MTU ... Prepare for path MTU discovery by splitting up the concept of DefaultMTU() into the concepts of the Tailscale TUN MTU, MTUs of underlying network interfaces, minimum "safe" TUN MTU, user configured TUN MTU, probed path MTU to a peer, and maximum probed MTU. Add a set of likely MTUs to probe. Updates #311 Signed-off-by: Val <valerie@tailscale.com>	1 year ago