From 5aa5db89d6a9a637e65c29d0db5c20b08bbcd8c4 Mon Sep 17 00:00:00 2001 From: Brad Fitzpatrick Date: Thu, 3 Sep 2020 15:45:41 -0700 Subject: [PATCH] cmd/tailscaled, wgengine/netstack: add start of gvisor userspace netstack work Not usefully functional yet (mostly a proof of concept), but getting it submitted for some work @namansood is going to do atop this. Updates #707 Updates #634 Updates #48 Updates #835 --- cmd/tailscaled/depaware.txt | 32 ++++- cmd/tailscaled/tailscaled.go | 7 +- go.mod | 3 +- go.sum | 248 ++++++++++++++++++++++++++++++++ ipn/ipnserver/server_test.go | 2 +- ipn/loglines_test.go | 2 +- wgengine/magicsock/magicsock.go | 19 +++ wgengine/netstack/netstack.go | 154 ++++++++++++++++++++ wgengine/userspace.go | 32 ++++- wgengine/userspace_test.go | 2 +- wgengine/watchdog_test.go | 4 +- 11 files changed, 490 insertions(+), 15 deletions(-) create mode 100644 wgengine/netstack/netstack.go diff --git a/cmd/tailscaled/depaware.txt b/cmd/tailscaled/depaware.txt index b0f26cf51..ede42af08 100644 --- a/cmd/tailscaled/depaware.txt +++ b/cmd/tailscaled/depaware.txt @@ -10,6 +10,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de W 💣 github.com/go-ole/go-ole/oleutil from tailscale.com/wgengine/winnet L 💣 github.com/godbus/dbus/v5 from tailscale.com/wgengine/router/dns github.com/golang/groupcache/lru from tailscale.com/wgengine/filter+ + github.com/google/btree from gvisor.dev/gvisor/pkg/tcpip/header+ L 💣 github.com/jsimonetti/rtnetlink from tailscale.com/wgengine/monitor L github.com/jsimonetti/rtnetlink/internal/unix from github.com/jsimonetti/rtnetlink github.com/klauspost/compress/fse from github.com/klauspost/compress/huff0 @@ -37,6 +38,33 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de 💣 go4.org/mem from tailscale.com/control/controlclient+ go4.org/unsafe/assume-no-moving-gc from go4.org/intern W 💣 golang.zx2c4.com/wireguard/windows/tunnel/winipcfg from tailscale.com/net/interfaces+ + 💣 gvisor.dev/gvisor/pkg/gohacks from gvisor.dev/gvisor/pkg/state/wire + gvisor.dev/gvisor/pkg/linewriter from gvisor.dev/gvisor/pkg/log + gvisor.dev/gvisor/pkg/log from gvisor.dev/gvisor/pkg/tcpip/stack + gvisor.dev/gvisor/pkg/rand from gvisor.dev/gvisor/pkg/tcpip/network/hash+ + 💣 gvisor.dev/gvisor/pkg/sleep from gvisor.dev/gvisor/pkg/tcpip/stack+ + 💣 gvisor.dev/gvisor/pkg/state from gvisor.dev/gvisor/pkg/tcpip+ + gvisor.dev/gvisor/pkg/state/wire from gvisor.dev/gvisor/pkg/state + 💣 gvisor.dev/gvisor/pkg/sync from gvisor.dev/gvisor/pkg/linewriter+ + 💣 gvisor.dev/gvisor/pkg/tcpip from gvisor.dev/gvisor/pkg/tcpip/adapters/gonet+ + gvisor.dev/gvisor/pkg/tcpip/adapters/gonet from tailscale.com/wgengine/netstack + gvisor.dev/gvisor/pkg/tcpip/buffer from gvisor.dev/gvisor/pkg/tcpip+ + gvisor.dev/gvisor/pkg/tcpip/hash/jenkins from gvisor.dev/gvisor/pkg/tcpip/stack+ + gvisor.dev/gvisor/pkg/tcpip/header from gvisor.dev/gvisor/pkg/tcpip/link/channel+ + gvisor.dev/gvisor/pkg/tcpip/link/channel from tailscale.com/wgengine/netstack + gvisor.dev/gvisor/pkg/tcpip/network/fragmentation from gvisor.dev/gvisor/pkg/tcpip/network/ipv4 + gvisor.dev/gvisor/pkg/tcpip/network/hash from gvisor.dev/gvisor/pkg/tcpip/network/ipv4 + gvisor.dev/gvisor/pkg/tcpip/network/ipv4 from tailscale.com/wgengine/netstack + gvisor.dev/gvisor/pkg/tcpip/ports from gvisor.dev/gvisor/pkg/tcpip/stack+ + gvisor.dev/gvisor/pkg/tcpip/seqnum from gvisor.dev/gvisor/pkg/tcpip/header+ + gvisor.dev/gvisor/pkg/tcpip/stack from gvisor.dev/gvisor/pkg/tcpip/adapters/gonet+ + gvisor.dev/gvisor/pkg/tcpip/transport/icmp from tailscale.com/wgengine/netstack + gvisor.dev/gvisor/pkg/tcpip/transport/packet from gvisor.dev/gvisor/pkg/tcpip/transport/raw + gvisor.dev/gvisor/pkg/tcpip/transport/raw from gvisor.dev/gvisor/pkg/tcpip/transport/icmp+ + 💣 gvisor.dev/gvisor/pkg/tcpip/transport/tcp from gvisor.dev/gvisor/pkg/tcpip/adapters/gonet+ + gvisor.dev/gvisor/pkg/tcpip/transport/tcpconntrack from gvisor.dev/gvisor/pkg/tcpip/stack + gvisor.dev/gvisor/pkg/tcpip/transport/udp from gvisor.dev/gvisor/pkg/tcpip/adapters/gonet+ + gvisor.dev/gvisor/pkg/waiter from gvisor.dev/gvisor/pkg/tcpip+ inet.af/netaddr from tailscale.com/control/controlclient+ rsc.io/goversion/version from tailscale.com/version tailscale.com/atomicfile from tailscale.com/ipn+ @@ -94,10 +122,11 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de tailscale.com/wgengine/filter from tailscale.com/control/controlclient+ tailscale.com/wgengine/magicsock from tailscale.com/cmd/tailscaled+ 💣 tailscale.com/wgengine/monitor from tailscale.com/wgengine + tailscale.com/wgengine/netstack from tailscale.com/cmd/tailscaled tailscale.com/wgengine/router from tailscale.com/cmd/tailscaled+ tailscale.com/wgengine/router/dns from tailscale.com/ipn+ tailscale.com/wgengine/tsdns from tailscale.com/ipn+ - tailscale.com/wgengine/tstun from tailscale.com/wgengine + tailscale.com/wgengine/tstun from tailscale.com/wgengine+ W 💣 tailscale.com/wgengine/winnet from tailscale.com/wgengine/router golang.org/x/crypto/blake2b from golang.org/x/crypto/nacl/box golang.org/x/crypto/blake2s from github.com/tailscale/wireguard-go/device @@ -141,6 +170,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de compress/flate from compress/gzip+ compress/gzip from internal/profile+ compress/zlib from debug/elf+ + container/heap from gvisor.dev/gvisor/pkg/tcpip/network/fragmentation+ container/list from crypto/tls+ context from crypto/tls+ crypto from crypto/ecdsa+ diff --git a/cmd/tailscaled/tailscaled.go b/cmd/tailscaled/tailscaled.go index bc9fa4958..376705c88 100644 --- a/cmd/tailscaled/tailscaled.go +++ b/cmd/tailscaled/tailscaled.go @@ -33,6 +33,7 @@ "tailscale.com/version" "tailscale.com/wgengine" "tailscale.com/wgengine/magicsock" + "tailscale.com/wgengine/netstack" "tailscale.com/wgengine/router" ) @@ -147,7 +148,11 @@ func run() error { var e wgengine.Engine if args.fake { - e, err = wgengine.NewFakeUserspaceEngine(logf, args.port) + var impl wgengine.FakeImplFunc + if args.tunname == "userspace-networking" { + impl = netstack.Impl + } + e, err = wgengine.NewFakeUserspaceEngine(logf, 0, impl) } else { e, err = wgengine.NewUserspaceEngine(logf, args.tunname, args.port) } diff --git a/go.mod b/go.mod index 4ffcee775..972839c43 100644 --- a/go.mod +++ b/go.mod @@ -17,9 +17,9 @@ require ( github.com/goreleaser/nfpm v1.1.10 github.com/jsimonetti/rtnetlink v0.0.0-20201216134343-bde56ed16391 github.com/klauspost/compress v1.10.10 - github.com/kr/pty v1.1.1 github.com/mdlayher/netlink v1.2.0 github.com/mdlayher/sdnotify v0.0.0-20200625151349-e4a4f32afc4a + github.com/kr/pty v1.1.4-0.20190131011033-7dc38fb350b1 github.com/miekg/dns v1.1.30 github.com/pborman/getopt v0.0.0-20190409184431-ee0cd42419d3 github.com/peterbourgon/ff/v2 v2.0.0 @@ -41,5 +41,6 @@ require ( golang.zx2c4.com/wireguard/windows v0.1.2-0.20201113162609-9b85be97fdf8 honnef.co/go/tools v0.1.0 inet.af/netaddr v0.0.0-20201231012616-c5dc91d2a016 + gvisor.dev/gvisor v0.0.0-20200903175658-a842a338ecd9 rsc.io/goversion v1.2.0 ) diff --git a/go.sum b/go.sum index e1a30cce6..7deb2ae50 100644 --- a/go.sum +++ b/go.sum @@ -1,8 +1,24 @@ +bazil.org/fuse v0.0.0-20160811212531-371fbbdaa898/go.mod h1:Xbm+BRKSBEpa4q4hTSxohYNQpsxXPbPry4JJWOB3LB8= +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= +cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= +cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= +cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0= +cloud.google.com/go v0.52.1-0.20200122224058-0482b626c726/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4= +cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o= +cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE= +cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I= +cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw= +dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU= github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ= github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo= github.com/Masterminds/semver/v3 v3.0.3 h1:znjIyLfpXEDQjOIEWh+ehwpTU14UzUPub3c3sm36u14= github.com/Masterminds/semver/v3 v3.0.3/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs= +github.com/Microsoft/go-winio v0.4.15-0.20190919025122-fc70bd9a86b5/go.mod h1:tTuCMEN+UleMWgg9dVx4Hu52b1bJo+59jBh3ajtinzw= +github.com/Microsoft/hcsshim v0.8.6/go.mod h1:Op3hHsoHPAvb6lceZHDtd9OkTew38wNoXnJs8iY7rUg= github.com/alecthomas/kingpin v2.2.6+incompatible/go.mod h1:59OFYbFVLKQKq+mqrL6Rw5bR0c3ACQaawgXx0QYndlE= github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho= @@ -18,27 +34,80 @@ github.com/blakesmith/ar v0.0.0-20190502131153-809d4375e1fb h1:m935MPodAbYS46DG4 github.com/blakesmith/ar v0.0.0-20190502131153-809d4375e1fb/go.mod h1:PkYb9DJNAwrSvRx5DYA+gUcOIgTGVMNkfSCbZM8cWpI= github.com/cavaliercoder/go-cpio v0.0.0-20180626203310-925f9528c45e h1:hHg27A0RSSp2Om9lubZpiMgVbvn39bsUmW9U5h0twqc= github.com/cavaliercoder/go-cpio v0.0.0-20180626203310-925f9528c45e/go.mod h1:oDpT4efm8tSYHXV5tHSdRvBet/b/QzxZ+XyyPehvm3A= +github.com/cenkalti/backoff v1.1.1-0.20190506075156-2146c9339422/go.mod h1:b6Nc7NRH5C4aCISLry0tLnTjcuTEvoiqcWDdsU0sOGM= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= +github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI= +github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI= +github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU= +github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= +github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc= +github.com/containerd/cgroups v0.0.0-20181219155423-39b18af02c41/go.mod h1:X9rLEHIqSf/wfK8NsPqxJmeZgW4pcfzdXITDrUSJ6uI= +github.com/containerd/console v0.0.0-20191206165004-02ecf6a7291e/go.mod h1:8Pf4gM6VEbTNRIT26AyyU7hxdQU3MvAvxVI0sc00XBE= +github.com/containerd/containerd v1.3.4/go.mod h1:bC6axHOhabU15QhwfG7w5PipXdVtMXFTttgp+kVtyUA= +github.com/containerd/continuity v0.0.0-20200710164510-efbc4488d8fe/go.mod h1:cECdGN1O8G9bgKTlLhuPJimka6Xb/Gg7vYzCTNVxhvo= +github.com/containerd/fifo v0.0.0-20191213151349-ff969a566b00/go.mod 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h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA= golang.org/x/tools v0.0.0-20201001230009-b5b87423c93b/go.mod h1:z6u4i615ZeAfBE4XtMziQW1fSVJXACjjbWkB/mvPzlU= golang.org/x/tools v0.0.0-20201002184944-ecd9fd270d5d/go.mod h1:z6u4i615ZeAfBE4XtMziQW1fSVJXACjjbWkB/mvPzlU= golang.org/x/tools v0.0.0-20201211185031-d93e913c1a58 h1:1Bs6RVeBFtLZ8Yi1Hk07DiOqzvwLD/4hln4iahvFlag= @@ -240,15 +440,62 @@ golang.zx2c4.com/wireguard v0.0.20200321-0.20201111175144-60b3766b89b9/go.mod h1 golang.zx2c4.com/wireguard/windows v0.1.2-0.20201004085714-dd60d0447f81/go.mod h1:GaK5zcgr5XE98WaRzIDilumDBp5/yP8j2kG/LCDnvAM= golang.zx2c4.com/wireguard/windows v0.1.2-0.20201113162609-9b85be97fdf8 h1:nlXPqGA98n+qcq1pwZ28KjM5EsFQvamKS00A+VUeVjs= golang.zx2c4.com/wireguard/windows v0.1.2-0.20201113162609-9b85be97fdf8/go.mod h1:psva4yDnAHLuh7lUzOK7J7bLYxNFfo0iKWz+mi9gzkA= +google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE= +google.golang.org/api v0.7.0/go.mod h1:WtwebWUNSVBH/HAw79HIFXZNqEvBhG+Ra+ax0hx3E3M= +google.golang.org/api v0.8.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg= +google.golang.org/api v0.9.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg= +google.golang.org/api v0.15.0/go.mod h1:iLdEw5Ide6rF15KTC1Kkl0iskquN2gFfn9o9XIsbkAI= +google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM= google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4= +google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4= +google.golang.org/appengine v1.6.1/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0= +google.golang.org/appengine v1.6.5/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc= +google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc= +google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE= 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+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg= honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k= honnef.co/go/tools v0.1.0 h1:AWNL1W1i7f0wNZ8VwOKNJ0sliKvOF/adn0EHenfUh+c= honnef.co/go/tools v0.1.0/go.mod h1:XtegFAyX/PfluP4921rXU5IkjkqBCDnUq4W8VCIoKvM= @@ -264,6 +511,7 @@ inet.af/netaddr v0.0.0-20201228234250-33d0a924ebbf h1:0eHZ8v6j5wIiOVyoYPd70ueZ/R inet.af/netaddr v0.0.0-20201228234250-33d0a924ebbf/go.mod h1:9NdhtHLglxJliAZB6aC5ws3mfnUArdAzHG/iJq7cB/o= inet.af/netaddr v0.0.0-20201231012616-c5dc91d2a016 h1:CEeeAJW60aRKE6gGJC5krs2xC/uM2l8SasvgeDXFN5Q= inet.af/netaddr v0.0.0-20201231012616-c5dc91d2a016/go.mod h1:lbePDLSB5c45kkUmF7ETNE5X9z/yuQvWJIv1hhb5rFI= +rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8= rsc.io/goversion v1.2.0 h1:SPn+NLTiAG7w30IRK/DKp1BjvpWabYgxlLp/+kx5J8w= rsc.io/goversion v1.2.0/go.mod h1:Eih9y/uIBS3ulggl7KNJ09xGSLcuNaLgmvvqa07sgfo= tailscale.com v1.2.10/go.mod h1:JEJiCce3MHtPCTdX2ahLc4tcnxZ7b5etish1Yt0B6+w= diff --git a/ipn/ipnserver/server_test.go b/ipn/ipnserver/server_test.go index 9a368c17f..0d89c1a3a 100644 --- a/ipn/ipnserver/server_test.go +++ b/ipn/ipnserver/server_test.go @@ -56,7 +56,7 @@ func TestRunMultipleAccepts(t *testing.T) { } } - eng, err := wgengine.NewFakeUserspaceEngine(logf, 0) + eng, err := wgengine.NewFakeUserspaceEngine(logf, 0, nil) if err != nil { t.Fatal(err) } diff --git a/ipn/loglines_test.go b/ipn/loglines_test.go index 75e830dc0..fb056e8be 100644 --- a/ipn/loglines_test.go +++ b/ipn/loglines_test.go @@ -41,7 +41,7 @@ func TestLocalLogLines(t *testing.T) { store := &MemoryStore{ cache: make(map[StateKey][]byte), } - e, err := wgengine.NewFakeUserspaceEngine(logListen.Logf, 0) + e, err := wgengine.NewFakeUserspaceEngine(logListen.Logf, 0, nil) if err != nil { t.Fatal(err) } diff --git a/wgengine/magicsock/magicsock.go b/wgengine/magicsock/magicsock.go index d7e995747..5523c2bfb 100644 --- a/wgengine/magicsock/magicsock.go +++ b/wgengine/magicsock/magicsock.go @@ -3497,3 +3497,22 @@ type ippCacheKey struct { // derpStr replaces DERP IPs in s with "derp-". func derpStr(s string) string { return strings.ReplaceAll(s, "127.3.3.40:", "derp-") } + +// WhoIs reports the node and user who owns the node with the given IP. +// If ok == true, n and u are valid. +func (c *Conn) WhoIs(ip netaddr.IP) (n *tailcfg.Node, u tailcfg.UserProfile, ok bool) { + c.mu.Lock() + defer c.mu.Unlock() + if c.netMap == nil { + return n, u, false + } + for _, p := range c.netMap.Peers { + for _, ipp := range p.Addresses { + if ipp.IsSingleIP() && ipp.IP == ip { + u, ok := c.netMap.UserProfiles[p.User] + return p, u, ok + } + } + } + return nil, u, false +} diff --git a/wgengine/netstack/netstack.go b/wgengine/netstack/netstack.go new file mode 100644 index 000000000..78891e1ea --- /dev/null +++ b/wgengine/netstack/netstack.go @@ -0,0 +1,154 @@ +// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package netstack wires up gVisor's netstack into Tailscale. +package netstack + +import ( + "context" + "errors" + "fmt" + "log" + "net" + "strings" + + "gvisor.dev/gvisor/pkg/tcpip" + "gvisor.dev/gvisor/pkg/tcpip/adapters/gonet" + "gvisor.dev/gvisor/pkg/tcpip/buffer" + "gvisor.dev/gvisor/pkg/tcpip/header" + "gvisor.dev/gvisor/pkg/tcpip/link/channel" + "gvisor.dev/gvisor/pkg/tcpip/network/ipv4" + "gvisor.dev/gvisor/pkg/tcpip/stack" + "gvisor.dev/gvisor/pkg/tcpip/transport/icmp" + "gvisor.dev/gvisor/pkg/tcpip/transport/tcp" + "gvisor.dev/gvisor/pkg/tcpip/transport/udp" + "gvisor.dev/gvisor/pkg/waiter" + "inet.af/netaddr" + "tailscale.com/net/packet" + "tailscale.com/types/logger" + "tailscale.com/wgengine" + "tailscale.com/wgengine/filter" + "tailscale.com/wgengine/magicsock" + "tailscale.com/wgengine/tstun" +) + +func Impl(logf logger.Logf, tundev *tstun.TUN, e wgengine.Engine, mc *magicsock.Conn) error { + if mc == nil { + return errors.New("nil magicsock.Conn") + } + if tundev == nil { + return errors.New("nil tundev") + } + if logf == nil { + return errors.New("nil logger") + } + if e == nil { + return errors.New("nil Engine") + } + ipstack := stack.New(stack.Options{ + NetworkProtocols: []stack.NetworkProtocol{ipv4.NewProtocol()}, + TransportProtocols: []stack.TransportProtocol{tcp.NewProtocol(), udp.NewProtocol(), icmp.NewProtocol4()}, + }) + + const mtu = 1500 + linkEP := channel.New(512, mtu, "") + + const nicID = 1 + if err := ipstack.CreateNIC(nicID, linkEP); err != nil { + log.Fatal(err) + } + + ipstack.AddAddress(nicID, ipv4.ProtocolNumber, tcpip.Address(net.ParseIP("100.96.188.101").To4())) + + // Add 0.0.0.0/0 default route. + subnet, _ := tcpip.NewSubnet(tcpip.Address(strings.Repeat("\x00", 4)), tcpip.AddressMask(strings.Repeat("\x00", 4))) + ipstack.SetRouteTable([]tcpip.Route{ + { + Destination: subnet, + NIC: nicID, + }, + }) + + // use Forwarder to accept any connection from stack + fwd := tcp.NewForwarder(ipstack, 0, 16, func(r *tcp.ForwarderRequest) { + logf("XXX ForwarderRequest: %v", r) + var wq waiter.Queue + ep, err := r.CreateEndpoint(&wq) + if err != nil { + r.Complete(true) + return + } + r.Complete(false) + c := gonet.NewTCPConn(&wq, ep) + // TCP echo + go echo(c, e, mc) + + }) + ipstack.SetTransportProtocolHandler(tcp.ProtocolNumber, fwd.HandlePacket) + + go func() { + for { + packetInfo, ok := linkEP.ReadContext(context.Background()) + if !ok { + logf("XXX ReadContext-for-write = ok=false") + continue + } + pkt := packetInfo.Pkt + hdrNetwork := pkt.NetworkHeader() + hdrTransport := pkt.TransportHeader() + + full := make([]byte, 0, pkt.Size()) + full = append(full, hdrNetwork.View()...) + full = append(full, hdrTransport.View()...) + full = append(full, pkt.Data.ToView()...) + + logf("XXX packet Write out: % x", full) + if err := tundev.InjectOutbound(full); err != nil { + log.Printf("netstack inject outbound: %v", err) + return + } + + } + }() + + tundev.PostFilterIn = func(p *packet.Parsed, t *tstun.TUN) filter.Response { + var pn tcpip.NetworkProtocolNumber + switch p.IPVersion { + case 4: + pn = header.IPv4ProtocolNumber + case 6: + pn = header.IPv6ProtocolNumber + } + logf("XXX packet in (from %v): % x", p.Src, p.Buffer()) + vv := buffer.View(append([]byte(nil), p.Buffer()...)).ToVectorisedView() + packetBuf := stack.NewPacketBuffer(stack.PacketBufferOptions{ + Data: vv, + }) + linkEP.InjectInbound(pn, packetBuf) + return filter.Accept + } + return nil +} + +func echo(c *gonet.TCPConn, e wgengine.Engine, mc *magicsock.Conn) { + defer c.Close() + src, _ := netaddr.FromStdIP(c.RemoteAddr().(*net.TCPAddr).IP) + who := "" + if n, u, ok := mc.WhoIs(src); ok { + who = fmt.Sprintf("%v from %v", u.DisplayName, n.Name) + } + fmt.Fprintf(c, "Hello, %s! Thanks for connecting to me on port %v (Try other ports too!)\nEchoing...\n", + who, + c.LocalAddr().(*net.TCPAddr).Port) + buf := make([]byte, 1500) + for { + n, err := c.Read(buf) + if err != nil { + log.Printf("Err: %v", err) + break + } + c.Write(buf[:n]) + } + log.Print("Connection closed") +} diff --git a/wgengine/userspace.go b/wgengine/userspace.go index 13ddcb981..6b7d23526 100644 --- a/wgengine/userspace.go +++ b/wgengine/userspace.go @@ -138,9 +138,19 @@ type EngineConfig struct { // Fake determines whether this engine is running in fake mode, // which disables such features as DNS configuration and unrestricted ICMP Echo responses. Fake bool + + // FakeImpl, if non-nil, specifies which type of fake implementation to + // use. Two values are typical: nil, for a basic ping-only fake + // implementation, and netstack.Impl, which brings in gvisor's netstack + // to the binary. The desire to keep that out of some binaries is why + // this func exists, so wgengine need not depend on gvisor. + FakeImpl FakeImplFunc } -func NewFakeUserspaceEngine(logf logger.Logf, listenPort uint16) (Engine, error) { +// FakeImplFunc is the type used by EngineConfig.FakeImpl. See docs there. +type FakeImplFunc func(logger.Logf, *tstun.TUN, Engine, *magicsock.Conn) error + +func NewFakeUserspaceEngine(logf logger.Logf, listenPort uint16, impl FakeImplFunc) (Engine, error) { logf("Starting userspace wireguard engine (with fake TUN device)") conf := EngineConfig{ Logf: logf, @@ -148,6 +158,7 @@ func NewFakeUserspaceEngine(logf logger.Logf, listenPort uint16) (Engine, error) RouterGen: router.NewFake, ListenPort: listenPort, Fake: true, + FakeImpl: impl, } return NewUserspaceEngineAdvanced(conf) } @@ -209,12 +220,6 @@ func newUserspaceEngineAdvanced(conf EngineConfig) (_ Engine, reterr error) { e.linkState, _ = getLinkState() logf("link state: %+v", e.linkState) - // Respond to all pings only in fake mode. - if conf.Fake { - e.tundev.PostFilterIn = echoRespondToAll - } - e.tundev.PreFilterOut = e.handleLocalPackets - mon, err := monitor.New(logf, func() { e.LinkChange(false) tshttpproxy.InvalidateCache() @@ -247,6 +252,19 @@ func newUserspaceEngineAdvanced(conf EngineConfig) (_ Engine, reterr error) { } e.magicConn.SetNetworkUp(e.linkState.AnyInterfaceUp()) + // Respond to all pings only in fake mode. + if conf.Fake { + if impl := conf.FakeImpl; impl != nil { + if err := impl(logf, e.tundev, e, e.magicConn); err != nil { + return nil, err + } + } else { + // Respond to all pings only in fake mode. + e.tundev.PostFilterIn = echoRespondToAll + } + } + e.tundev.PreFilterOut = e.handleLocalPackets + // wireguard-go logs as it starts and stops routines. // Silence those; there are a lot of them, and they're just noise. allowLogf := func(s string) bool { diff --git a/wgengine/userspace_test.go b/wgengine/userspace_test.go index 440e750e3..817b03960 100644 --- a/wgengine/userspace_test.go +++ b/wgengine/userspace_test.go @@ -84,7 +84,7 @@ func TestNoteReceiveActivity(t *testing.T) { } func TestUserspaceEngineReconfig(t *testing.T) { - e, err := NewFakeUserspaceEngine(t.Logf, 0) + e, err := NewFakeUserspaceEngine(t.Logf, 0, nil) if err != nil { t.Fatal(err) } diff --git a/wgengine/watchdog_test.go b/wgengine/watchdog_test.go index 7487d4827..7b3cc659c 100644 --- a/wgengine/watchdog_test.go +++ b/wgengine/watchdog_test.go @@ -17,7 +17,7 @@ func TestWatchdog(t *testing.T) { t.Run("default watchdog does not fire", func(t *testing.T) { t.Parallel() - e, err := NewFakeUserspaceEngine(t.Logf, 0) + e, err := NewFakeUserspaceEngine(t.Logf, 0, nil) if err != nil { t.Fatal(err) } @@ -35,7 +35,7 @@ func TestWatchdog(t *testing.T) { t.Run("watchdog fires on blocked getStatus", func(t *testing.T) { t.Parallel() - e, err := NewFakeUserspaceEngine(t.Logf, 0) + e, err := NewFakeUserspaceEngine(t.Logf, 0, nil) if err != nil { t.Fatal(err) }