tailscale

Commit Graph

Author	SHA1	Message	Date
David Anderson	44c2b7dc79	net/dns: on windows, skip site-local v6 resolvers. Further refinement for tailscale/corp#1662. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
Josh Bleecher Snyder	99705aa6b7	net/tstun: split TUN events channel into up/down and MTU We had a long-standing bug in which our TUN events channel was being received from simultaneously in two places. The first is wireguard-go. At wgengine/userspace.go:366, we pass e.tundev to wireguard-go, which starts a goroutine (RoutineTUNEventReader) that receives from that channel and uses events to adjust the MTU and bring the device up/down. At wgengine/userspace.go:374, we launch a goroutine that receives from e.tundev, logs MTU changes, and triggers state updates when up/down changes occur. Events were getting delivered haphazardly between the two of them. We don't really want wireguard-go to receive the up/down events; we control the state of the device explicitly by calling device.Up. And the userspace.go loop MTU logging duplicates logging that wireguard-go does when it received MTU updates. So this change splits the single TUN events channel into up/down and other (aka MTU), and sends them to the parties that ought to receive them. I'm actually a bit surprised that this hasn't caused more visible trouble. If a down event went to wireguard-go but the subsequent up event went to userspace.go, we could end up with the wireguard-go device disappearing. I believe that this may also (somewhat accidentally) be a fix for #1790. Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>	4 years ago
David Anderson	97d2fa2f56	net/dns: work around WSL DNS implementation flaws. Fixes tailscale/corp#1662 Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
Avery Pennarun	a92b9647c5	wgengine/bench: speed test for channels, sockets, and wireguard-go. This tries to generate traffic at a rate that will saturate the receiver, without overdoing it, even in the event of packet loss. It's unrealistically more aggressive than TCP (which will back off quickly in case of packet loss) but less silly than a blind test that just generates packets as fast as it can (which can cause all the CPU to be absorbed by the transmitter, giving an incorrect impression of how much capacity the total system has). Initial indications are that a syscall about every 10 packets (TCP bulk delivery) is roughly the same speed as sending every packet through a channel. A syscall per packet is about 5x-10x slower than that. The whole tailscale wireguard-go + magicsock + packet filter combination is about 4x slower again, which is better than I thought we'd do, but probably has room for improvement. Note that in "full" tailscale, there is also a tundev read/write for every packet, effectively doubling the syscall overhead per packet. Given these numbers, it seems like read/write syscalls are only 25-40% of the total CPU time used in tailscale proper, so we do have significant non-syscall optimization work to do too. Sample output: $ GOMAXPROCS=2 go test -bench . -benchtime 5s ./cmd/tailbench goos: linux goarch: amd64 pkg: tailscale.com/cmd/tailbench cpu: Intel(R) Core(TM) i7-4785T CPU @ 2.20GHz BenchmarkTrivialNoAlloc/32-2 56340248 93.85 ns/op 340.98 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTrivialNoAlloc/124-2 57527490 99.27 ns/op 1249.10 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTrivialNoAlloc/1024-2 52537773 111.3 ns/op 9200.39 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTrivial/32-2 41878063 135.6 ns/op 236.04 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTrivial/124-2 41270439 138.4 ns/op 896.02 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTrivial/1024-2 36337252 154.3 ns/op 6635.30 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkBlockingChannel/32-2 12171654 494.3 ns/op 64.74 MB/s 0 %lost 1791 B/op 0 allocs/op BenchmarkBlockingChannel/124-2 12149956 507.8 ns/op 244.17 MB/s 0 %lost 1792 B/op 1 allocs/op BenchmarkBlockingChannel/1024-2 11034754 528.8 ns/op 1936.42 MB/s 0 %lost 1792 B/op 1 allocs/op BenchmarkNonlockingChannel/32-2 8960622 2195 ns/op 14.58 MB/s 8.825 %lost 1792 B/op 1 allocs/op BenchmarkNonlockingChannel/124-2 3014614 2224 ns/op 55.75 MB/s 11.18 %lost 1792 B/op 1 allocs/op BenchmarkNonlockingChannel/1024-2 3234915 1688 ns/op 606.53 MB/s 3.765 %lost 1792 B/op 1 allocs/op BenchmarkDoubleChannel/32-2 8457559 764.1 ns/op 41.88 MB/s 5.945 %lost 1792 B/op 1 allocs/op BenchmarkDoubleChannel/124-2 5497726 1030 ns/op 120.38 MB/s 12.14 %lost 1792 B/op 1 allocs/op BenchmarkDoubleChannel/1024-2 7985656 1360 ns/op 752.86 MB/s 13.57 %lost 1792 B/op 1 allocs/op BenchmarkUDP/32-2 1652134 3695 ns/op 8.66 MB/s 0 %lost 176 B/op 3 allocs/op BenchmarkUDP/124-2 1621024 3765 ns/op 32.94 MB/s 0 %lost 176 B/op 3 allocs/op BenchmarkUDP/1024-2 1553750 3825 ns/op 267.72 MB/s 0 %lost 176 B/op 3 allocs/op BenchmarkTCP/32-2 11056336 503.2 ns/op 63.60 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTCP/124-2 11074869 533.7 ns/op 232.32 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTCP/1024-2 8934968 671.4 ns/op 1525.20 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkWireGuardTest/32-2 1403702 4547 ns/op 7.04 MB/s 14.37 %lost 467 B/op 3 allocs/op BenchmarkWireGuardTest/124-2 780645 7927 ns/op 15.64 MB/s 1.537 %lost 420 B/op 3 allocs/op BenchmarkWireGuardTest/1024-2 512671 11791 ns/op 86.85 MB/s 0.5206 %lost 411 B/op 3 allocs/op PASS ok tailscale.com/wgengine/bench 195.724s Updates #414. Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>	4 years ago
David Anderson	f6b7d08aea	net/dns: work around new NetworkManager in other selection paths. Further bits of #1788 Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	25ce9885a2	net/dns: don't use NM+resolved for NM >=1.26.6. NetworkManager fixed the bug that forced us to use NetworkManager if it's programming systemd-resolved, and in the same release also made NetworkManager ignore DNS settings provided for unmanaged interfaces... Which breaks what we used to do. So, with versions 1.26.6 and above, we MUST NOT use NetworkManager to indirectly program systemd-resolved, but thankfully we can talk to resolved directly and get the right outcome. Fixes #1788 Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
Brad Fitzpatrick	e41075dd4a	net/interfaces: work around race fetching routing table Fixes #1345 Updates golang/go#45736 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
David Anderson	30f5d706a1	net/dns/resolver: remove unnecessary/racy WaitGroup. Fixes #1663 Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	89c81c26c5	net/dns: fix resolved match domains when no nameservers are provided. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	4be26b269f	net/dns: correctly capture all traffic in non-split configs. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	ca283ac899	net/dns: remove config in openresolv when given an empty DNS config. Part of #1720. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	53213114ec	net/dns: make debian_resolvconf correctly clear DNS configs. More of #1720. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	3b1ab78954	net/dns: restore resolv.conf when given an empty config in directManager. Fixes #1720. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	158328ba24	net/dns: remove ForceSplitDNSForTesting. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
Naman Sood	71b7e48547	net/tsaddr: expand ephemeral nodes range to /64 Signed-off-by: Naman Sood <mail@nsood.in>	4 years ago
Naman Sood	b85d80b37f	net/tsaddr: add new IP range for ephemeral nodes in Tailscale ULA (#1715 ) Signed-off-by: Naman Sood <mail@nsood.in>	4 years ago
David Anderson	bb0710d51d	net/dns: add debugging traces to DNS manager selection on linux. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	4b70c7b717	net/dns: fix inverted test for NetworkManager. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	4849a4d3c8	net/dns: error out on linux if /etc/resolv.conf can't be read. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	1f9b73a531	net/dns: fix freebsd DNS manager selection. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
AdamKorcz	2243bb48c2	stun fuzzer: Small fix Signed-off-by: AdamKorcz <adam@adalogics.com>	4 years ago
Brad Fitzpatrick	c2ca2ac8c4	net/dns: fix FreeBSD build Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
David Anderson	84bd50329a	net/dns: fix staticheck. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	d6bb11b5bf	net/dns: implement correct manager detection on linux. Part of #953. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	9ef932517b	net/dns: fix NM's GetBaseConfig when no configs exist. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	fe3b1ab747	net/dns: refactor dbus connection setup in resolved manager. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	854d5d36a1	net/dns: return error from NewOSManager, use it to initialize NM. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	9aa33b43e6	net/dns: support split and unsplit DNS in NetworkManager. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	87eb8384f5	net/dns: fix up NetworkManager configurator a bit. Clear LLMNR and mdns flags, update reasoning for our settings, and set our override priority harder than before when we want to be primary resolver. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	3d81e6260b	net/dns: set resolved DefaultRoute setting according to split-dns mode. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	cca230cc23	net/dns: fix staticcheck errors. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
Brad Fitzpatrick	4b47393e0c	net/dns: pacify staticcheck for now Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
David Anderson	a7340c2015	net/dns: support split DNS in systemd-resolved. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	84430cdfa1	net/dns: improve NetworkManager detection, using more DBus. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	9a48bac8ad	net/dns: rename resolvconf.go to debian_resolvconf.go. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	9831f1b183	net/dns: also include 'tail' and 'base' files when fixing up resolv.conf. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	e43afe9140	net/dns: implement prior config reading for debian resolvconf. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	143e5dd087	net/dns: rename script variable. Debian resolvconf is not legacy, it's alive and well, just historically before the other implementations. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	55b39fa945	net/dns: add documentation to openresolv's config fetch. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	61b361bac0	net/dns: teach the openresolv manager to read DNS config. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	58760f7b82	net/dns: split resolvconfManager into a debian and an openresolv manager. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	5480189313	net/dns: implement a DNS override workaround for legacy resolvconf. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	1a371b93be	util/dnsname: add FQDN type, use throughout codebase. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
AdamKorcz	7a1813fd24	Added 2 fuzzers Signed-off-by: AdamKorcz <adam@adalogics.com>	4 years ago
David Anderson	e638a4d86b	net/dns: make directManager support split DNS, and work in sandboxes. Fixes #1495, #683. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	2685260ba1	net/dns: add temporary fallback to quad-9 resolver for split-DNS testing. This allows split-DNS configurations to not break clients on OSes that haven't yet been ported to understand split DNS, by falling back to quad-9 as a global resolver when handed an "impossible to implement" split-DNS config. Part of #953. Needs to be removed before shipping 1.8. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	b9e194c14b	net/dns: add missing FQDN qualification. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	b74a8994ca	net/dns: make FQDN dot style consistent in more places. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	6def647514	net/dns/resolver: don't avoid tailscale routes for DNS forwarding. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	4a64d2a603	net/dns: some post-review cleanups. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago

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280 Commits (a8766815a43d8bd415032346f869f0ca54a35dbf)