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https://github.com/tailscale/tailscale.git
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net/tstun, wgengine/magicsock: enable vectorized I/O on Linux (#6663)
This commit updates the wireguard-go dependency and implements the necessary changes to the tun.Device and conn.Bind implementations to support passing vectors of packets in tailscaled. This significantly improves throughput performance on Linux. Updates #414 Signed-off-by: Jordan Whited <jordan@tailscale.com> Signed-off-by: James Tucker <james@tailscale.com> Co-authored-by: James Tucker <james@tailscale.com>
This commit is contained in:
Jordan Whited
GitHub
parent
389238fe4a
commit
76389d8baf
@ -130,6 +130,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
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💣 golang.zx2c4.com/wireguard/conn from golang.zx2c4.com/wireguard/device+
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W 💣 golang.zx2c4.com/wireguard/conn/winrio from golang.zx2c4.com/wireguard/conn
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💣 golang.zx2c4.com/wireguard/device from tailscale.com/net/tstun+
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L golang.zx2c4.com/wireguard/endian from golang.zx2c4.com/wireguard/tun
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💣 golang.zx2c4.com/wireguard/ipc from golang.zx2c4.com/wireguard/device
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W 💣 golang.zx2c4.com/wireguard/ipc/namedpipe from golang.zx2c4.com/wireguard/ipc
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golang.zx2c4.com/wireguard/ratelimiter from golang.zx2c4.com/wireguard/device
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10
go.mod
10
go.mod
@ -2,6 +2,8 @@ module tailscale.com
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go 1.19
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replace golang.zx2c4.com/wireguard => github.com/tailscale/wireguard-go v0.0.0-20221207223341-6be4ed075788
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require (
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filippo.io/mkcert v1.4.3
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github.com/Microsoft/go-winio v0.6.0
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@ -64,12 +66,12 @@ require (
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github.com/vishvananda/netlink v1.1.1-0.20211118161826-650dca95af54
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go4.org/mem v0.0.0-20210711025021-927187094b94
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go4.org/netipx v0.0.0-20220725152314-7e7bdc8411bf
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golang.org/x/crypto v0.1.0
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golang.org/x/crypto v0.3.0
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golang.org/x/exp v0.0.0-20221205204356-47842c84f3db
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golang.org/x/net v0.1.0
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golang.org/x/net v0.2.0
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golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4
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golang.org/x/sys v0.1.0
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golang.org/x/term v0.1.0
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golang.org/x/sys v0.2.0
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golang.org/x/term v0.2.0
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golang.org/x/time v0.0.0-20211116232009-f0f3c7e86c11
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golang.org/x/tools v0.2.0
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golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224
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20
go.sum
20
go.sum
@ -1108,6 +1108,8 @@ github.com/tailscale/mkctr v0.0.0-20220601142259-c0b937af2e89 h1:7xU7AFQE83h0wz/
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github.com/tailscale/mkctr v0.0.0-20220601142259-c0b937af2e89/go.mod h1:OGMqrTzDqmJkGumUTtOv44Rp3/4xS+QFbE8Rn0AGlaU=
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github.com/tailscale/netlink v1.1.1-0.20211101221916-cabfb018fe85 h1:zrsUcqrG2uQSPhaUPjUQwozcRdDdSxxqhNgNZ3drZFk=
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github.com/tailscale/netlink v1.1.1-0.20211101221916-cabfb018fe85/go.mod h1:NzVQi3Mleb+qzq8VmcWpSkcSYxXIg0DkI6XDzpVkhJ0=
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github.com/tailscale/wireguard-go v0.0.0-20221207223341-6be4ed075788 h1:HRBKNhAqG+3NGtudGB8QzpaKlvf4MoBCMEnjdF+D+nA=
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github.com/tailscale/wireguard-go v0.0.0-20221207223341-6be4ed075788/go.mod h1:wzWjYPfptTrgXwkAZmjd7sXHf7RYnz5PrPr6GN1eb2Y=
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github.com/tc-hib/winres v0.1.6 h1:qgsYHze+BxQPEYilxIz/KCQGaClvI2+yLBAZs+3+0B8=
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github.com/tc-hib/winres v0.1.6/go.mod h1:pe6dOR40VOrGz8PkzreVKNvEKnlE8t4yR8A8naL+t7A=
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github.com/tcnksm/go-httpstat v0.2.0 h1:rP7T5e5U2HfmOBmZzGgGZjBQ5/GluWUylujl0tJ04I0=
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@ -1267,8 +1269,8 @@ golang.org/x/crypto v0.0.0-20210817164053-32db794688a5/go.mod h1:GvvjBRRGRdwPK5y
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golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
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golang.org/x/crypto v0.0.0-20211117183948-ae814b36b871/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
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golang.org/x/crypto v0.0.0-20220331220935-ae2d96664a29/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
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golang.org/x/crypto v0.1.0 h1:MDRAIl0xIo9Io2xV565hzXHw3zVseKrJKodhohM5CjU=
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golang.org/x/crypto v0.1.0/go.mod h1:RecgLatLF4+eUMCP1PoPZQb+cVrJcOPbHkTkbkB9sbw=
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golang.org/x/crypto v0.3.0 h1:a06MkbcxBrEFc0w0QIZWXrH/9cCX6KJyWbBOIwAn+7A=
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golang.org/x/crypto v0.3.0/go.mod h1:hebNnKkNXi2UzZN1eVRvBB7co0a+JxK6XbPiWVs/3J4=
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golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
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golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
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golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
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@ -1375,8 +1377,8 @@ golang.org/x/net v0.0.0-20210928044308-7d9f5e0b762b/go.mod h1:9nx3DQGgdP8bBQD5qx
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golang.org/x/net v0.0.0-20211015210444-4f30a5c0130f/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
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golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
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golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd/go.mod h1:CfG3xpIq0wQ8r1q4Su4UZFWDARRcnwPjda9FqA0JpMk=
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golang.org/x/net v0.1.0 h1:hZ/3BUoy5aId7sCpA/Tc5lt8DkFgdVS2onTpJsZ/fl0=
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golang.org/x/net v0.1.0/go.mod h1:Cx3nUiGt4eDBEyega/BKRp+/AlGL8hYe7U9odMt2Cco=
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golang.org/x/net v0.2.0 h1:sZfSu1wtKLGlWI4ZZayP0ck9Y73K1ynO6gqzTdBVdPU=
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golang.org/x/net v0.2.0/go.mod h1:KqCZLdyyvdV855qA2rE3GC2aiw5xGR5TEjj8smXukLY=
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golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
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golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
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golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
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@ -1512,13 +1514,13 @@ golang.org/x/sys v0.0.0-20211105183446-c75c47738b0c/go.mod h1:oPkhp1MJrh7nUepCBc
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golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/sys v0.0.0-20220128215802-99c3d69c2c27/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/sys v0.1.0 h1:kunALQeHf1/185U1i0GOB/fy1IPRDDpuoOOqRReG57U=
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golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/sys v0.2.0 h1:ljd4t30dBnAvMZaQCevtY0xLLD0A+bRZXbgLMLU1F/A=
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golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
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golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
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golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
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golang.org/x/term v0.1.0 h1:g6Z6vPFA9dYBAF7DWcH6sCcOntplXsDKcliusYijMlw=
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golang.org/x/term v0.1.0/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
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golang.org/x/term v0.2.0 h1:z85xZCsEl7bi/KwbNADeBYoOP0++7W1ipu+aGnpwzRM=
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golang.org/x/term v0.2.0/go.mod h1:TVmDHMZPmdnySmBfhjOoOdhjzdE1h4u1VwSiw2l1Nuc=
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golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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@ -1656,8 +1658,6 @@ golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8T
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golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224 h1:Ug9qvr1myri/zFN6xL17LSCBGFDnphBBhzmILHsM5TY=
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golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224/go.mod h1:deeaetjYA+DHMHg+sMSMI58GrEteJUUzzw7en6TJQcI=
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golang.zx2c4.com/wireguard v0.0.0-20220920152132-bb719d3a6e2c h1:Okh6a1xpnJslG9Mn84pId1Mn+Q8cvpo4HCeeFWHo0cA=
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golang.zx2c4.com/wireguard v0.0.0-20220920152132-bb719d3a6e2c/go.mod h1:enML0deDxY1ux+B6ANGiwtg0yAJi1rctkTpcHNAVPyg=
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golang.zx2c4.com/wireguard/windows v0.5.3 h1:On6j2Rpn3OEMXqBq00QEDC7bWSZrPIHKIus8eIuExIE=
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golang.zx2c4.com/wireguard/windows v0.5.3/go.mod h1:9TEe8TJmtwyQebdFwAkEWOPr3prrtqm+REGFifP60hI=
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google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
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@ -34,21 +34,22 @@ func (t *fakeTUN) Close() error {
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return nil
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}
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func (t *fakeTUN) Read(out []byte, offset int) (int, error) {
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func (t *fakeTUN) Read(out [][]byte, sizes []int, offset int) (int, error) {
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<-t.closechan
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return 0, io.EOF
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}
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func (t *fakeTUN) Write(b []byte, n int) (int, error) {
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func (t *fakeTUN) Write(b [][]byte, n int) (int, error) {
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select {
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case <-t.closechan:
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return 0, ErrClosed
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default:
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}
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return len(b), nil
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return 1, nil
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}
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func (t *fakeTUN) Flush() error { return nil }
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func (t *fakeTUN) MTU() (int, error) { return 1500, nil }
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func (t *fakeTUN) Name() (string, error) { return "FakeTUN", nil }
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func (t *fakeTUN) Events() chan tun.Event { return t.evchan }
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func (t *fakeTUN) Flush() error { return nil }
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func (t *fakeTUN) MTU() (int, error) { return 1500, nil }
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func (t *fakeTUN) Name() (string, error) { return "FakeTUN", nil }
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func (t *fakeTUN) Events() <-chan tun.Event { return t.evchan }
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func (t *fakeTUN) BatchSize() int { return 1 }
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@ -12,6 +12,7 @@
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"net/netip"
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"os"
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"os/exec"
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"sync"
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"github.com/insomniacslk/dhcp/dhcpv4"
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"golang.org/x/sys/unix"
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@ -23,6 +24,7 @@
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"tailscale.com/net/netaddr"
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"tailscale.com/net/packet"
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"tailscale.com/types/ipproto"
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"tailscale.com/util/multierr"
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)
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// TODO: this was randomly generated once. Maybe do it per process start? But
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@ -69,13 +71,7 @@ func openDevice(fd int, tapName, bridgeName string) (tun.Device, error) {
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}
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}
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// Also sets non-blocking I/O on fd when creating tun.Device.
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dev, _, err := tun.CreateUnmonitoredTUNFromFD(fd) // TODO: MTU
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if err != nil {
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return nil, err
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}
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return dev, nil
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return newTAPDevice(fd, tapName)
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}
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type etherType [2]byte
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@ -168,7 +164,8 @@ func (t *Wrapper) handleTAPFrame(ethBuf []byte) bool {
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copy(res.HardwareAddressTarget(), req.HardwareAddressSender())
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copy(res.ProtocolAddressTarget(), req.ProtocolAddressSender())
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n, err := t.tdev.Write(buf, 0)
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// TODO(raggi): reduce allocs!
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n, err := t.tdev.Write([][]byte{buf}, 0)
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if tapDebug {
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t.logf("tap: wrote ARP reply %v, %v", n, err)
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}
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@ -252,7 +249,9 @@ func (t *Wrapper) handleDHCPRequest(ethBuf []byte) bool {
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netip.AddrPortFrom(netaddr.IPv4(100, 100, 100, 100), 67), // src
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netip.AddrPortFrom(netaddr.IPv4(255, 255, 255, 255), 68), // dst
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)
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n, err := t.tdev.Write(pkt, 0)
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// TODO(raggi): reduce allocs!
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n, err := t.tdev.Write([][]byte{pkt}, 0)
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if tapDebug {
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t.logf("tap: wrote DHCP OFFER %v, %v", n, err)
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}
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@ -279,7 +278,8 @@ func (t *Wrapper) handleDHCPRequest(ethBuf []byte) bool {
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netip.AddrPortFrom(netaddr.IPv4(100, 100, 100, 100), 67), // src
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netip.AddrPortFrom(netaddr.IPv4(255, 255, 255, 255), 68), // dst
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)
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n, err := t.tdev.Write(pkt, 0)
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// TODO(raggi): reduce allocs!
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n, err := t.tdev.Write([][]byte{pkt}, 0)
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if tapDebug {
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t.logf("tap: wrote DHCP ACK %v, %v", n, err)
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}
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@ -346,21 +346,108 @@ func (t *Wrapper) destMAC() [6]byte {
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return t.destMACAtomic.Load()
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}
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func (t *Wrapper) tapWrite(buf []byte, offset int) (int, error) {
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if offset < ethernetFrameSize {
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return 0, fmt.Errorf("[unexpected] weird offset %d for TAP write", offset)
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func newTAPDevice(fd int, tapName string) (tun.Device, error) {
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err := unix.SetNonblock(fd, true)
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if err != nil {
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return nil, err
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}
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eth := buf[offset-ethernetFrameSize:]
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dst := t.destMAC()
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copy(eth[:6], dst[:])
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copy(eth[6:12], ourMAC[:])
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et := etherTypeIPv4
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if buf[offset]>>4 == 6 {
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et = etherTypeIPv6
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file := os.NewFile(uintptr(fd), "/dev/tap")
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d := &tapDevice{
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file: file,
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events: make(chan tun.Event),
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name: tapName,
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}
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eth[12], eth[13] = et[0], et[1]
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if tapDebug {
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t.logf("tap: tapWrite off=%v % x", offset, buf)
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}
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return t.tdev.Write(buf, offset-ethernetFrameSize)
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return d, nil
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}
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|
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var (
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_ setWrapperer = &tapDevice{}
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)
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|
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type tapDevice struct {
|
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file *os.File
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events chan tun.Event
|
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name string
|
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wrapper *Wrapper
|
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closeOnce sync.Once
|
||||
}
|
||||
|
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func (t *tapDevice) setWrapper(wrapper *Wrapper) {
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t.wrapper = wrapper
|
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}
|
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|
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func (t *tapDevice) File() *os.File {
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return t.file
|
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}
|
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|
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func (t *tapDevice) Name() (string, error) {
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return t.name, nil
|
||||
}
|
||||
|
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func (t *tapDevice) Read(buffs [][]byte, sizes []int, offset int) (int, error) {
|
||||
n, err := t.file.Read(buffs[0][offset:])
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
sizes[0] = n
|
||||
return 1, nil
|
||||
}
|
||||
|
||||
func (t *tapDevice) Write(buffs [][]byte, offset int) (int, error) {
|
||||
errs := make([]error, 0)
|
||||
wrote := 0
|
||||
for _, buff := range buffs {
|
||||
if offset < ethernetFrameSize {
|
||||
errs = append(errs, fmt.Errorf("[unexpected] weird offset %d for TAP write", offset))
|
||||
return 0, multierr.New(errs...)
|
||||
}
|
||||
eth := buff[offset-ethernetFrameSize:]
|
||||
dst := t.wrapper.destMAC()
|
||||
copy(eth[:6], dst[:])
|
||||
copy(eth[6:12], ourMAC[:])
|
||||
et := etherTypeIPv4
|
||||
if buff[offset]>>4 == 6 {
|
||||
et = etherTypeIPv6
|
||||
}
|
||||
eth[12], eth[13] = et[0], et[1]
|
||||
if tapDebug {
|
||||
t.wrapper.logf("tap: tapWrite off=%v % x", offset, buff)
|
||||
}
|
||||
_, err := t.file.Write(buff[offset-ethernetFrameSize:])
|
||||
if err != nil {
|
||||
errs = append(errs, err)
|
||||
} else {
|
||||
wrote++
|
||||
}
|
||||
}
|
||||
return wrote, multierr.New(errs...)
|
||||
}
|
||||
|
||||
func (t *tapDevice) MTU() (int, error) {
|
||||
ifr, err := unix.NewIfreq(t.name)
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
err = unix.IoctlIfreq(int(t.file.Fd()), unix.SIOCGIFMTU, ifr)
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
return int(ifr.Uint32()), nil
|
||||
}
|
||||
|
||||
func (t *tapDevice) Events() <-chan tun.Event {
|
||||
return t.events
|
||||
}
|
||||
|
||||
func (t *tapDevice) Close() error {
|
||||
var err error
|
||||
t.closeOnce.Do(func() {
|
||||
close(t.events)
|
||||
err = t.file.Close()
|
||||
})
|
||||
return err
|
||||
}
|
||||
|
||||
func (t *tapDevice) BatchSize() int {
|
||||
return 1
|
||||
}
|
||||
|
||||
@ -6,5 +6,4 @@
|
||||
|
||||
package tstun
|
||||
|
||||
func (*Wrapper) handleTAPFrame([]byte) bool { panic("unreachable") }
|
||||
func (*Wrapper) tapWrite([]byte, int) (int, error) { panic("unreachable") }
|
||||
func (*Wrapper) handleTAPFrame([]byte) bool { panic("unreachable") }
|
||||
|
||||
@ -25,6 +25,7 @@
|
||||
// New returns a tun.Device for the requested device name, along with
|
||||
// the OS-dependent name that was allocated to the device.
|
||||
func New(logf logger.Logf, tunName string) (tun.Device, string, error) {
|
||||
var disableTUNOffload = envknob.Bool("TS_DISABLE_TUN_OFFLOAD")
|
||||
var dev tun.Device
|
||||
var err error
|
||||
if strings.HasPrefix(tunName, "tap:") {
|
||||
@ -51,6 +52,11 @@ func New(logf logger.Logf, tunName string) (tun.Device, string, error) {
|
||||
tunMTU = mtu
|
||||
}
|
||||
dev, err = tun.CreateTUN(tunName, tunMTU)
|
||||
if err == nil && disableTUNOffload {
|
||||
if do, ok := dev.(tun.DisableOffloader); ok {
|
||||
do.DisableOffload()
|
||||
}
|
||||
}
|
||||
}
|
||||
if err != nil {
|
||||
return nil, "", err
|
||||
|
||||
@ -88,25 +88,31 @@ type Wrapper struct {
|
||||
destMACAtomic syncs.AtomicValue[[6]byte]
|
||||
discoKey syncs.AtomicValue[key.DiscoPublic]
|
||||
|
||||
// buffer stores the oldest unconsumed packet from tdev.
|
||||
// It is made a static buffer in order to avoid allocations.
|
||||
buffer [maxBufferSize]byte
|
||||
// bufferConsumedMu protects bufferConsumed from concurrent sends and closes.
|
||||
// It does not prevent send-after-close, only data races.
|
||||
// vectorBuffer stores the oldest unconsumed packet vector from tdev. It is
|
||||
// allocated in wrap() and the underlying arrays should never grow.
|
||||
vectorBuffer [][]byte
|
||||
// bufferConsumedMu protects bufferConsumed from concurrent sends, closes,
|
||||
// and send-after-close (by way of bufferConsumedClosed).
|
||||
bufferConsumedMu sync.Mutex
|
||||
// bufferConsumed synchronizes access to buffer (shared by Read and poll).
|
||||
// bufferConsumedClosed is true when bufferConsumed has been closed. This is
|
||||
// read by bufferConsumed writers to prevent send-after-close.
|
||||
bufferConsumedClosed bool
|
||||
// bufferConsumed synchronizes access to vectorBuffer (shared by Read() and
|
||||
// pollVector()).
|
||||
//
|
||||
// Close closes bufferConsumed. There may be outstanding sends to bufferConsumed
|
||||
// when that happens; we catch any resulting panics.
|
||||
// This lets us avoid expensive multi-case selects.
|
||||
// Close closes bufferConsumed and sets bufferConsumedClosed to true.
|
||||
bufferConsumed chan struct{}
|
||||
|
||||
// closed signals poll (by closing) when the device is closed.
|
||||
closed chan struct{}
|
||||
// outboundMu protects outbound from concurrent sends and closes.
|
||||
// It does not prevent send-after-close, only data races.
|
||||
// outboundMu protects outbound and vectorOutbound from concurrent sends,
|
||||
// closes, and send-after-close (by way of outboundClosed).
|
||||
outboundMu sync.Mutex
|
||||
// outbound is the queue by which packets leave the TUN device.
|
||||
// outboundClosed is true when outbound or vectorOutbound have been closed.
|
||||
// This is read by outbound and vectorOutbound writers to prevent
|
||||
// send-after-close.
|
||||
outboundClosed bool
|
||||
// vectorOutbound is the queue by which packets leave the TUN device.
|
||||
//
|
||||
// The directions are relative to the network, not the device:
|
||||
// inbound packets arrive via UDP and are written into the TUN device;
|
||||
@ -115,12 +121,10 @@ type Wrapper struct {
|
||||
// the other direction must wait on a WireGuard goroutine to poll it.
|
||||
//
|
||||
// Empty reads are skipped by WireGuard, so it is always legal
|
||||
// to discard an empty packet instead of sending it through t.outbound.
|
||||
// to discard an empty packet instead of sending it through vectorOutbound.
|
||||
//
|
||||
// Close closes outbound. There may be outstanding sends to outbound
|
||||
// when that happens; we catch any resulting panics.
|
||||
// This lets us avoid expensive multi-case selects.
|
||||
outbound chan tunReadResult
|
||||
// Close closes vectorOutbound and sets outboundClosed to true.
|
||||
vectorOutbound chan tunVectorReadResult
|
||||
|
||||
// eventsUpDown yields up and down tun.Events that arrive on a Wrapper's events channel.
|
||||
eventsUpDown chan tun.Event
|
||||
@ -172,19 +176,30 @@ type Wrapper struct {
|
||||
stats atomic.Pointer[connstats.Statistics]
|
||||
}
|
||||
|
||||
// tunReadResult is the result of a TUN read, or an injected result pretending to be a TUN read.
|
||||
// The data is not interpreted in the usual way for a Read method.
|
||||
// See the comment in the middle of Wrap.Read.
|
||||
type tunReadResult struct {
|
||||
// Only one of err, packet or data should be set, and are read in that order
|
||||
// of precedence.
|
||||
err error
|
||||
// tunInjectedRead is an injected packet pretending to be a tun.Read().
|
||||
type tunInjectedRead struct {
|
||||
// Only one of packet or data should be set, and are read in that order of
|
||||
// precedence.
|
||||
packet *stack.PacketBuffer
|
||||
data []byte
|
||||
}
|
||||
|
||||
// injected is set if the read result was generated internally, and contained packets should not
|
||||
// pass through filters.
|
||||
injected bool
|
||||
// tunVectorReadResult is the result of a tun.Read(), or an injected packet
|
||||
// pretending to be a tun.Read().
|
||||
type tunVectorReadResult struct {
|
||||
// Only one of err, data, or injected should be set, and are read in that
|
||||
// order of precedence.
|
||||
err error
|
||||
data [][]byte
|
||||
injected tunInjectedRead
|
||||
|
||||
dataOffset int
|
||||
}
|
||||
|
||||
type setWrapperer interface {
|
||||
// setWrapper enables the underlying TUN/TAP to have access to the Wrapper.
|
||||
// It MUST be called only once during initialization, other usage is unsafe.
|
||||
setWrapper(*Wrapper)
|
||||
}
|
||||
|
||||
func WrapTAP(logf logger.Logf, tdev tun.Device) *Wrapper {
|
||||
@ -197,7 +212,7 @@ func Wrap(logf logger.Logf, tdev tun.Device) *Wrapper {
|
||||
|
||||
func wrap(logf logger.Logf, tdev tun.Device, isTAP bool) *Wrapper {
|
||||
logf = logger.WithPrefix(logf, "tstun: ")
|
||||
tun := &Wrapper{
|
||||
w := &Wrapper{
|
||||
logf: logf,
|
||||
limitedLogf: logger.RateLimitedFn(logf, 1*time.Minute, 2, 10),
|
||||
isTAP: isTAP,
|
||||
@ -206,21 +221,30 @@ func wrap(logf logger.Logf, tdev tun.Device, isTAP bool) *Wrapper {
|
||||
// a goroutine should not block when setting it, even with no listeners.
|
||||
bufferConsumed: make(chan struct{}, 1),
|
||||
closed: make(chan struct{}),
|
||||
// outbound can be unbuffered; the buffer is an optimization.
|
||||
outbound: make(chan tunReadResult, 1),
|
||||
eventsUpDown: make(chan tun.Event),
|
||||
eventsOther: make(chan tun.Event),
|
||||
// vectorOutbound can be unbuffered; the buffer is an optimization.
|
||||
vectorOutbound: make(chan tunVectorReadResult, 1),
|
||||
eventsUpDown: make(chan tun.Event),
|
||||
eventsOther: make(chan tun.Event),
|
||||
// TODO(dmytro): (highly rate-limited) hexdumps should happen on unknown packets.
|
||||
filterFlags: filter.LogAccepts | filter.LogDrops,
|
||||
}
|
||||
|
||||
go tun.poll()
|
||||
go tun.pumpEvents()
|
||||
// The buffer starts out consumed.
|
||||
tun.bufferConsumed <- struct{}{}
|
||||
tun.noteActivity()
|
||||
w.vectorBuffer = make([][]byte, tdev.BatchSize())
|
||||
for i := range w.vectorBuffer {
|
||||
w.vectorBuffer[i] = make([]byte, maxBufferSize)
|
||||
}
|
||||
go w.pollVector()
|
||||
|
||||
return tun
|
||||
go w.pumpEvents()
|
||||
// The buffer starts out consumed.
|
||||
w.bufferConsumed <- struct{}{}
|
||||
w.noteActivity()
|
||||
|
||||
if sw, ok := w.tdev.(setWrapperer); ok {
|
||||
sw.setWrapper(w)
|
||||
}
|
||||
|
||||
return w
|
||||
}
|
||||
|
||||
// SetDestIPActivityFuncs sets a map of funcs to run per packet
|
||||
@ -261,10 +285,12 @@ func (t *Wrapper) Close() error {
|
||||
t.closeOnce.Do(func() {
|
||||
close(t.closed)
|
||||
t.bufferConsumedMu.Lock()
|
||||
t.bufferConsumedClosed = true
|
||||
close(t.bufferConsumed)
|
||||
t.bufferConsumedMu.Unlock()
|
||||
t.outboundMu.Lock()
|
||||
close(t.outbound)
|
||||
t.outboundClosed = true
|
||||
close(t.vectorOutbound)
|
||||
t.outboundMu.Unlock()
|
||||
err = t.tdev.Close()
|
||||
})
|
||||
@ -323,7 +349,7 @@ func (t *Wrapper) EventsUpDown() chan tun.Event {
|
||||
// Events returns a TUN event channel that contains all non-Up, non-Down events.
|
||||
// It is named Events because it is the set of events that we want to expose to wireguard-go,
|
||||
// and Events is the name specified by the wireguard-go tun.Device interface.
|
||||
func (t *Wrapper) Events() chan tun.Event {
|
||||
func (t *Wrapper) Events() <-chan tun.Event {
|
||||
return t.eventsOther
|
||||
}
|
||||
|
||||
@ -331,10 +357,6 @@ func (t *Wrapper) File() *os.File {
|
||||
return t.tdev.File()
|
||||
}
|
||||
|
||||
func (t *Wrapper) Flush() error {
|
||||
return t.tdev.Flush()
|
||||
}
|
||||
|
||||
func (t *Wrapper) MTU() (int, error) {
|
||||
return t.tdev.MTU()
|
||||
}
|
||||
@ -343,94 +365,95 @@ func (t *Wrapper) Name() (string, error) {
|
||||
return t.tdev.Name()
|
||||
}
|
||||
|
||||
// allowSendOnClosedChannel suppresses panics due to sending on a closed channel.
|
||||
// This allows us to avoid synchronization between poll and Close.
|
||||
// Such synchronization (particularly multi-case selects) is too expensive
|
||||
// for code like poll or Read that is on the hot path of every packet.
|
||||
// If this makes you sad or angry, you may want to join our
|
||||
// weekly Go Performance Delinquents Anonymous meetings on Monday nights.
|
||||
func allowSendOnClosedChannel() {
|
||||
r := recover()
|
||||
if r == nil {
|
||||
return
|
||||
}
|
||||
e, _ := r.(error)
|
||||
if e != nil && e.Error() == "send on closed channel" {
|
||||
return
|
||||
}
|
||||
panic(r)
|
||||
}
|
||||
|
||||
const ethernetFrameSize = 14 // 2 six byte MACs, 2 bytes ethertype
|
||||
|
||||
// poll polls t.tdev.Read, placing the oldest unconsumed packet into t.buffer.
|
||||
// This is needed because t.tdev.Read in general may block (it does on Windows),
|
||||
// so packets may be stuck in t.outbound if t.Read called t.tdev.Read directly.
|
||||
func (t *Wrapper) poll() {
|
||||
// pollVector polls t.tdev.Read(), placing the oldest unconsumed packet vector
|
||||
// into t.vectorBuffer. This is needed because t.tdev.Read() in general may
|
||||
// block (it does on Windows), so packets may be stuck in t.vectorOutbound if
|
||||
// t.Read() called t.tdev.Read() directly.
|
||||
func (t *Wrapper) pollVector() {
|
||||
sizes := make([]int, len(t.vectorBuffer))
|
||||
readOffset := PacketStartOffset
|
||||
if t.isTAP {
|
||||
readOffset = PacketStartOffset - ethernetFrameSize
|
||||
}
|
||||
|
||||
for range t.bufferConsumed {
|
||||
DoRead:
|
||||
for i := range t.vectorBuffer {
|
||||
t.vectorBuffer[i] = t.vectorBuffer[i][:cap(t.vectorBuffer[i])]
|
||||
}
|
||||
var n int
|
||||
var err error
|
||||
// Read may use memory in t.buffer before PacketStartOffset for mandatory headers.
|
||||
// This is the rationale behind the tun.Wrapper.{Read,Write} interfaces
|
||||
// and the reason t.buffer has size MaxMessageSize and not MaxContentSize.
|
||||
// In principle, read errors are not fatal (but wireguard-go disagrees).
|
||||
// We loop here until we get a non-empty (or failed) read.
|
||||
// We don't need this loop for correctness,
|
||||
// but wireguard-go will skip an empty read,
|
||||
// so we might as well avoid the send through t.outbound.
|
||||
for n == 0 && err == nil {
|
||||
if t.isClosed() {
|
||||
return
|
||||
}
|
||||
if t.isTAP {
|
||||
n, err = t.tdev.Read(t.buffer[:], PacketStartOffset-ethernetFrameSize)
|
||||
if tapDebug {
|
||||
s := fmt.Sprintf("% x", t.buffer[:])
|
||||
for strings.HasSuffix(s, " 00") {
|
||||
s = strings.TrimSuffix(s, " 00")
|
||||
}
|
||||
t.logf("TAP read %v, %v: %s", n, err, s)
|
||||
n, err = t.tdev.Read(t.vectorBuffer[:], sizes, readOffset)
|
||||
if t.isTAP && tapDebug {
|
||||
s := fmt.Sprintf("% x", t.vectorBuffer[0][:])
|
||||
for strings.HasSuffix(s, " 00") {
|
||||
s = strings.TrimSuffix(s, " 00")
|
||||
}
|
||||
} else {
|
||||
n, err = t.tdev.Read(t.buffer[:], PacketStartOffset)
|
||||
t.logf("TAP read %v, %v: %s", n, err, s)
|
||||
}
|
||||
}
|
||||
for i := range sizes[:n] {
|
||||
t.vectorBuffer[i] = t.vectorBuffer[i][:readOffset+sizes[i]]
|
||||
}
|
||||
if t.isTAP {
|
||||
if err == nil {
|
||||
ethernetFrame := t.buffer[PacketStartOffset-ethernetFrameSize:][:n]
|
||||
ethernetFrame := t.vectorBuffer[0][readOffset:]
|
||||
if t.handleTAPFrame(ethernetFrame) {
|
||||
goto DoRead
|
||||
}
|
||||
}
|
||||
// Fall through. We got an IP packet.
|
||||
if n >= ethernetFrameSize {
|
||||
n -= ethernetFrameSize
|
||||
if sizes[0] >= ethernetFrameSize {
|
||||
t.vectorBuffer[0] = t.vectorBuffer[0][:readOffset+sizes[0]-ethernetFrameSize]
|
||||
}
|
||||
if tapDebug {
|
||||
t.logf("tap regular frame: %x", t.buffer[PacketStartOffset:PacketStartOffset+n])
|
||||
t.logf("tap regular frame: %x", t.vectorBuffer[0][PacketStartOffset:PacketStartOffset+sizes[0]])
|
||||
}
|
||||
}
|
||||
t.sendOutbound(tunReadResult{data: t.buffer[PacketStartOffset : PacketStartOffset+n], err: err})
|
||||
t.sendVectorOutbound(tunVectorReadResult{
|
||||
data: t.vectorBuffer[:n],
|
||||
dataOffset: PacketStartOffset,
|
||||
err: err,
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
// sendBufferConsumed does t.bufferConsumed <- struct{}{}.
|
||||
// It protects against any panics or data races that that send could cause.
|
||||
func (t *Wrapper) sendBufferConsumed() {
|
||||
defer allowSendOnClosedChannel()
|
||||
t.bufferConsumedMu.Lock()
|
||||
defer t.bufferConsumedMu.Unlock()
|
||||
if t.bufferConsumedClosed {
|
||||
return
|
||||
}
|
||||
t.bufferConsumed <- struct{}{}
|
||||
}
|
||||
|
||||
// sendOutbound does t.outboundMu <- r.
|
||||
// It protects against any panics or data races that that send could cause.
|
||||
func (t *Wrapper) sendOutbound(r tunReadResult) {
|
||||
defer allowSendOnClosedChannel()
|
||||
// injectOutbound does t.vectorOutbound <- r
|
||||
func (t *Wrapper) injectOutbound(r tunInjectedRead) {
|
||||
t.outboundMu.Lock()
|
||||
defer t.outboundMu.Unlock()
|
||||
t.outbound <- r
|
||||
if t.outboundClosed {
|
||||
return
|
||||
}
|
||||
t.vectorOutbound <- tunVectorReadResult{
|
||||
injected: r,
|
||||
}
|
||||
}
|
||||
|
||||
// sendVectorOutbound does t.vectorOutbound <- r.
|
||||
func (t *Wrapper) sendVectorOutbound(r tunVectorReadResult) {
|
||||
t.outboundMu.Lock()
|
||||
defer t.outboundMu.Unlock()
|
||||
if t.outboundClosed {
|
||||
return
|
||||
}
|
||||
t.vectorOutbound <- r
|
||||
}
|
||||
|
||||
var (
|
||||
@ -514,34 +537,79 @@ func (t *Wrapper) IdleDuration() time.Duration {
|
||||
return mono.Since(t.lastActivityAtomic.LoadAtomic())
|
||||
}
|
||||
|
||||
func (t *Wrapper) Read(buf []byte, offset int) (int, error) {
|
||||
res, ok := <-t.outbound
|
||||
func (t *Wrapper) Read(buffs [][]byte, sizes []int, offset int) (int, error) {
|
||||
res, ok := <-t.vectorOutbound
|
||||
|
||||
if !ok {
|
||||
// Wrapper is closed.
|
||||
return 0, io.EOF
|
||||
}
|
||||
if res.err != nil {
|
||||
return 0, res.err
|
||||
}
|
||||
if res.data == nil {
|
||||
n, err := t.injectedRead(res.injected, buffs[0], offset)
|
||||
sizes[0] = n
|
||||
if err != nil && n == 0 {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
return 1, err
|
||||
}
|
||||
|
||||
metricPacketOut.Add(int64(len(res.data)))
|
||||
|
||||
var buffsPos int
|
||||
for _, data := range res.data {
|
||||
p := parsedPacketPool.Get().(*packet.Parsed)
|
||||
defer parsedPacketPool.Put(p)
|
||||
p.Decode(data[res.dataOffset:])
|
||||
if m := t.destIPActivity.Load(); m != nil {
|
||||
if fn := m[p.Dst.Addr()]; fn != nil {
|
||||
fn()
|
||||
}
|
||||
}
|
||||
if !t.disableFilter {
|
||||
response := t.filterOut(p)
|
||||
if response != filter.Accept {
|
||||
metricPacketOutDrop.Add(1)
|
||||
continue
|
||||
}
|
||||
}
|
||||
n := copy(buffs[buffsPos][offset:], data[res.dataOffset:])
|
||||
if n != len(data)-res.dataOffset {
|
||||
panic(fmt.Sprintf("short copy: %d != %d", n, len(data)-res.dataOffset))
|
||||
}
|
||||
sizes[buffsPos] = n
|
||||
if stats := t.stats.Load(); stats != nil {
|
||||
stats.UpdateTxVirtual(data[res.dataOffset:])
|
||||
}
|
||||
buffsPos++
|
||||
}
|
||||
|
||||
// t.vectorBuffer has a fixed location in memory.
|
||||
// TODO(raggi): add an explicit field and possibly method to the tunVectorReadResult
|
||||
// to signal when sendBufferConsumed should be called.
|
||||
if &res.data[0] == &t.vectorBuffer[0] {
|
||||
// We are done with t.buffer. Let poll() re-use it.
|
||||
t.sendBufferConsumed()
|
||||
}
|
||||
|
||||
t.noteActivity()
|
||||
return buffsPos, nil
|
||||
}
|
||||
|
||||
// injectedRead handles injected reads, which bypass filters.
|
||||
func (t *Wrapper) injectedRead(res tunInjectedRead, buf []byte, offset int) (int, error) {
|
||||
metricPacketOut.Add(1)
|
||||
|
||||
var n int
|
||||
if res.packet != nil {
|
||||
|
||||
n = copy(buf[offset:], res.packet.NetworkHeader().Slice())
|
||||
n += copy(buf[offset+n:], res.packet.TransportHeader().Slice())
|
||||
n += copy(buf[offset+n:], res.packet.Data().AsRange().ToSlice())
|
||||
|
||||
res.packet.DecRef()
|
||||
} else {
|
||||
n = copy(buf[offset:], res.data)
|
||||
|
||||
// t.buffer has a fixed location in memory.
|
||||
if &res.data[0] == &t.buffer[PacketStartOffset] {
|
||||
// We are done with t.buffer. Let poll re-use it.
|
||||
t.sendBufferConsumed()
|
||||
}
|
||||
}
|
||||
|
||||
p := parsedPacketPool.Get().(*packet.Parsed)
|
||||
@ -554,16 +622,6 @@ func (t *Wrapper) Read(buf []byte, offset int) (int, error) {
|
||||
}
|
||||
}
|
||||
|
||||
// Do not filter injected packets.
|
||||
if !res.injected && !t.disableFilter {
|
||||
response := t.filterOut(p)
|
||||
if response != filter.Accept {
|
||||
metricPacketOutDrop.Add(1)
|
||||
// WireGuard considers read errors fatal; pretend nothing was read
|
||||
return 0, nil
|
||||
}
|
||||
}
|
||||
|
||||
if stats := t.stats.Load(); stats != nil {
|
||||
stats.UpdateTxVirtual(buf[offset:][:n])
|
||||
}
|
||||
@ -668,42 +726,40 @@ func (t *Wrapper) filterIn(buf []byte) filter.Response {
|
||||
return filter.Accept
|
||||
}
|
||||
|
||||
// Write accepts an incoming packet. The packet begins at buf[offset:],
|
||||
// Write accepts incoming packets. The packets begins at buffs[:][offset:],
|
||||
// like wireguard-go/tun.Device.Write.
|
||||
func (t *Wrapper) Write(buf []byte, offset int) (int, error) {
|
||||
metricPacketIn.Add(1)
|
||||
func (t *Wrapper) Write(buffs [][]byte, offset int) (int, error) {
|
||||
metricPacketIn.Add(int64(len(buffs)))
|
||||
i := 0
|
||||
if !t.disableFilter {
|
||||
if t.filterIn(buf[offset:]) != filter.Accept {
|
||||
metricPacketInDrop.Add(1)
|
||||
// If we're not accepting the packet, lie to wireguard-go and pretend
|
||||
// that everything is okay with a nil error, so wireguard-go
|
||||
// doesn't log about this Write "failure".
|
||||
//
|
||||
// We return len(buf), but the ill-defined wireguard-go/tun.Device.Write
|
||||
// method doesn't specify how the offset affects the return value.
|
||||
// In fact, the Linux implementation does one of two different things depending
|
||||
// on how the /dev/net/tun was created. But fortunately the wireguard-go
|
||||
// code ignores the int return and only looks at the error:
|
||||
//
|
||||
// device/receive.go: _, err = device.tun.device.Write(....)
|
||||
//
|
||||
// TODO(bradfitz): fix upstream interface docs, implementation.
|
||||
return len(buf), nil
|
||||
for _, buff := range buffs {
|
||||
if t.filterIn(buff[offset:]) != filter.Accept {
|
||||
metricPacketInDrop.Add(1)
|
||||
} else {
|
||||
buffs[i] = buff
|
||||
i++
|
||||
}
|
||||
}
|
||||
} else {
|
||||
i = len(buffs)
|
||||
}
|
||||
buffs = buffs[:i]
|
||||
|
||||
t.noteActivity()
|
||||
return t.tdevWrite(buf, offset)
|
||||
if len(buffs) > 0 {
|
||||
t.noteActivity()
|
||||
_, err := t.tdevWrite(buffs, offset)
|
||||
return len(buffs), err
|
||||
}
|
||||
return 0, nil
|
||||
}
|
||||
|
||||
func (t *Wrapper) tdevWrite(buf []byte, offset int) (int, error) {
|
||||
func (t *Wrapper) tdevWrite(buffs [][]byte, offset int) (int, error) {
|
||||
if stats := t.stats.Load(); stats != nil {
|
||||
stats.UpdateRxVirtual(buf[offset:])
|
||||
for i := range buffs {
|
||||
stats.UpdateRxVirtual((buffs)[i][offset:])
|
||||
}
|
||||
}
|
||||
if t.isTAP {
|
||||
return t.tapWrite(buf, offset)
|
||||
}
|
||||
return t.tdev.Write(buf, offset)
|
||||
return t.tdev.Write(buffs, offset)
|
||||
}
|
||||
|
||||
func (t *Wrapper) GetFilter() *filter.Filter {
|
||||
@ -755,7 +811,7 @@ func (t *Wrapper) InjectInboundDirect(buf []byte, offset int) error {
|
||||
}
|
||||
|
||||
// Write to the underlying device to skip filters.
|
||||
_, err := t.tdevWrite(buf, offset)
|
||||
_, err := t.tdevWrite([][]byte{buf}, offset) // TODO(jwhited): alloc?
|
||||
return err
|
||||
}
|
||||
|
||||
@ -813,7 +869,7 @@ func (t *Wrapper) InjectOutbound(packet []byte) error {
|
||||
if len(packet) == 0 {
|
||||
return nil
|
||||
}
|
||||
t.sendOutbound(tunReadResult{data: packet, injected: true})
|
||||
t.injectOutbound(tunInjectedRead{data: packet})
|
||||
return nil
|
||||
}
|
||||
|
||||
@ -830,10 +886,14 @@ func (t *Wrapper) InjectOutboundPacketBuffer(packet *stack.PacketBuffer) error {
|
||||
packet.DecRef()
|
||||
return nil
|
||||
}
|
||||
t.sendOutbound(tunReadResult{packet: packet, injected: true})
|
||||
t.injectOutbound(tunInjectedRead{packet: packet})
|
||||
return nil
|
||||
}
|
||||
|
||||
func (t *Wrapper) BatchSize() int {
|
||||
return t.tdev.BatchSize()
|
||||
}
|
||||
|
||||
// Unwrap returns the underlying tun.Device.
|
||||
func (t *Wrapper) Unwrap() tun.Device {
|
||||
return t.tdev
|
||||
|
||||
@ -208,16 +208,24 @@ func TestReadAndInject(t *testing.T) {
|
||||
|
||||
var buf [MaxPacketSize]byte
|
||||
var seen = make(map[string]bool)
|
||||
sizes := make([]int, 1)
|
||||
// We expect the same packets back, in no particular order.
|
||||
for i := 0; i < len(written)+len(injected); i++ {
|
||||
n, err := tun.Read(buf[:], 0)
|
||||
packet := buf[:]
|
||||
buffs := [][]byte{packet}
|
||||
numPackets, err := tun.Read(buffs, sizes, 0)
|
||||
if err != nil {
|
||||
t.Errorf("read %d: error: %v", i, err)
|
||||
}
|
||||
if n != size {
|
||||
t.Errorf("read %d: got size %d; want %d", i, n, size)
|
||||
if numPackets != 1 {
|
||||
t.Fatalf("read %d packets, expected %d", numPackets, 1)
|
||||
}
|
||||
got := string(buf[:n])
|
||||
packet = packet[:sizes[0]]
|
||||
packetLen := len(packet)
|
||||
if packetLen != size {
|
||||
t.Errorf("read %d: got size %d; want %d", i, packetLen, size)
|
||||
}
|
||||
got := string(packet)
|
||||
t.Logf("read %d: got %s", i, got)
|
||||
seen[got] = true
|
||||
}
|
||||
@ -245,13 +253,10 @@ func TestWriteAndInject(t *testing.T) {
|
||||
go func() {
|
||||
for _, packet := range written {
|
||||
payload := []byte(packet)
|
||||
n, err := tun.Write(payload, 0)
|
||||
_, err := tun.Write([][]byte{payload}, 0)
|
||||
if err != nil {
|
||||
t.Errorf("%s: error: %v", packet, err)
|
||||
}
|
||||
if n != size {
|
||||
t.Errorf("%s: got size %d; want %d", packet, n, size)
|
||||
}
|
||||
}
|
||||
}()
|
||||
|
||||
@ -339,6 +344,7 @@ func TestFilter(t *testing.T) {
|
||||
var n int
|
||||
var err error
|
||||
var filtered bool
|
||||
sizes := make([]int, 1)
|
||||
|
||||
tunStats, _ := stats.Extract()
|
||||
if len(tunStats) > 0 {
|
||||
@ -352,11 +358,11 @@ func TestFilter(t *testing.T) {
|
||||
// If it stays zero, nothing made it through
|
||||
// to the wrapped TUN.
|
||||
tun.lastActivityAtomic.StoreAtomic(0)
|
||||
_, err = tun.Write(tt.data, 0)
|
||||
_, err = tun.Write([][]byte{tt.data}, 0)
|
||||
filtered = tun.lastActivityAtomic.LoadAtomic() == 0
|
||||
} else {
|
||||
chtun.Outbound <- tt.data
|
||||
n, err = tun.Read(buf[:], 0)
|
||||
n, err = tun.Read([][]byte{buf[:]}, sizes, 0)
|
||||
// In the read direction, errors are fatal, so we return n = 0 instead.
|
||||
filtered = (n == 0)
|
||||
}
|
||||
@ -400,7 +406,7 @@ func TestAllocs(t *testing.T) {
|
||||
ftun, tun := newFakeTUN(t.Logf, false)
|
||||
defer tun.Close()
|
||||
|
||||
buf := []byte{0x00}
|
||||
buf := [][]byte{[]byte{0x00}}
|
||||
err := tstest.MinAllocsPerRun(t, 0, func() {
|
||||
_, err := ftun.Write(buf, 0)
|
||||
if err != nil {
|
||||
@ -417,7 +423,7 @@ func TestAllocs(t *testing.T) {
|
||||
func TestClose(t *testing.T) {
|
||||
ftun, tun := newFakeTUN(t.Logf, false)
|
||||
|
||||
data := udp4("1.2.3.4", "5.6.7.8", 98, 98)
|
||||
data := [][]byte{udp4("1.2.3.4", "5.6.7.8", 98, 98)}
|
||||
_, err := ftun.Write(data, 0)
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
@ -435,7 +441,7 @@ func BenchmarkWrite(b *testing.B) {
|
||||
ftun, tun := newFakeTUN(b.Logf, true)
|
||||
defer tun.Close()
|
||||
|
||||
packet := udp4("5.6.7.8", "1.2.3.4", 89, 89)
|
||||
packet := [][]byte{udp4("5.6.7.8", "1.2.3.4", 89, 89)}
|
||||
for i := 0; i < b.N; i++ {
|
||||
_, err := ftun.Write(packet, 0)
|
||||
if err != nil {
|
||||
|
||||
@ -812,6 +812,18 @@ func (c *conn) LocalAddr() net.Addr {
|
||||
}
|
||||
}
|
||||
|
||||
func (c *conn) Read(buf []byte) (int, error) {
|
||||
panic("unimplemented stub")
|
||||
}
|
||||
|
||||
func (c *conn) RemoteAddr() net.Addr {
|
||||
panic("unimplemented stub")
|
||||
}
|
||||
|
||||
func (c *conn) Write(buf []byte) (int, error) {
|
||||
panic("unimplemented stub")
|
||||
}
|
||||
|
||||
func (c *conn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
|
||||
ctx, cancel := context.WithCancel(context.Background())
|
||||
defer cancel()
|
||||
|
||||
@ -168,25 +168,31 @@ type sourceTun struct {
|
||||
traf *TrafficGen
|
||||
}
|
||||
|
||||
func (t *sourceTun) Close() error { return nil }
|
||||
func (t *sourceTun) Events() chan tun.Event { return nil }
|
||||
func (t *sourceTun) File() *os.File { return nil }
|
||||
func (t *sourceTun) Flush() error { return nil }
|
||||
func (t *sourceTun) MTU() (int, error) { return 1500, nil }
|
||||
func (t *sourceTun) Name() (string, error) { return "source", nil }
|
||||
func (t *sourceTun) Close() error { return nil }
|
||||
func (t *sourceTun) Events() <-chan tun.Event { return nil }
|
||||
func (t *sourceTun) File() *os.File { return nil }
|
||||
func (t *sourceTun) Flush() error { return nil }
|
||||
func (t *sourceTun) MTU() (int, error) { return 1500, nil }
|
||||
func (t *sourceTun) Name() (string, error) { return "source", nil }
|
||||
|
||||
func (t *sourceTun) Write(b []byte, ofs int) (int, error) {
|
||||
// TODO(raggi): could be optimized for linux style batch sizes
|
||||
func (t *sourceTun) BatchSize() int { return 1 }
|
||||
|
||||
func (t *sourceTun) Write(b [][]byte, ofs int) (int, error) {
|
||||
// Discard all writes
|
||||
return len(b) - ofs, nil
|
||||
return len(b), nil
|
||||
}
|
||||
|
||||
func (t *sourceTun) Read(b []byte, ofs int) (int, error) {
|
||||
// Continually generate "input" packets
|
||||
n := t.traf.Generate(b, ofs)
|
||||
if n == 0 {
|
||||
return 0, io.EOF
|
||||
func (t *sourceTun) Read(b [][]byte, sizes []int, ofs int) (int, error) {
|
||||
for i, b := range b {
|
||||
// Continually generate "input" packets
|
||||
n := t.traf.Generate(b, ofs)
|
||||
sizes[i] = n
|
||||
if n == 0 {
|
||||
return 0, io.EOF
|
||||
}
|
||||
}
|
||||
return n, nil
|
||||
return len(b), nil
|
||||
}
|
||||
|
||||
type sinkTun struct {
|
||||
@ -194,20 +200,25 @@ type sinkTun struct {
|
||||
traf *TrafficGen
|
||||
}
|
||||
|
||||
func (t *sinkTun) Close() error { return nil }
|
||||
func (t *sinkTun) Events() chan tun.Event { return nil }
|
||||
func (t *sinkTun) File() *os.File { return nil }
|
||||
func (t *sinkTun) Flush() error { return nil }
|
||||
func (t *sinkTun) MTU() (int, error) { return 1500, nil }
|
||||
func (t *sinkTun) Name() (string, error) { return "sink", nil }
|
||||
func (t *sinkTun) Close() error { return nil }
|
||||
func (t *sinkTun) Events() <-chan tun.Event { return nil }
|
||||
func (t *sinkTun) File() *os.File { return nil }
|
||||
func (t *sinkTun) Flush() error { return nil }
|
||||
func (t *sinkTun) MTU() (int, error) { return 1500, nil }
|
||||
func (t *sinkTun) Name() (string, error) { return "sink", nil }
|
||||
|
||||
func (t *sinkTun) Read(b []byte, ofs int) (int, error) {
|
||||
func (t *sinkTun) Read(b [][]byte, sizes []int, ofs int) (int, error) {
|
||||
// Never returns
|
||||
select {}
|
||||
}
|
||||
|
||||
func (t *sinkTun) Write(b []byte, ofs int) (int, error) {
|
||||
func (t *sinkTun) Write(b [][]byte, ofs int) (int, error) {
|
||||
// Count packets, but discard them
|
||||
t.traf.GotPacket(b, ofs)
|
||||
return len(b) - ofs, nil
|
||||
for _, b := range b {
|
||||
t.traf.GotPacket(b, ofs)
|
||||
}
|
||||
return len(b), nil
|
||||
}
|
||||
|
||||
// TODO(raggi): could be optimized for linux style batch sizes
|
||||
func (t *sinkTun) BatchSize() int { return 1 }
|
||||
|
||||
@ -29,6 +29,8 @@
|
||||
"time"
|
||||
|
||||
"go4.org/mem"
|
||||
"golang.org/x/net/ipv4"
|
||||
"golang.org/x/net/ipv6"
|
||||
"golang.zx2c4.com/wireguard/conn"
|
||||
"tailscale.com/control/controlclient"
|
||||
"tailscale.com/derp"
|
||||
@ -269,6 +271,9 @@ type Conn struct {
|
||||
pconn4 RebindingUDPConn
|
||||
pconn6 RebindingUDPConn
|
||||
|
||||
receiveBatchPool sync.Pool
|
||||
sendBatchPool sync.Pool
|
||||
|
||||
// closeDisco4 and closeDisco6 are io.Closers to shut down the raw
|
||||
// disco packet receivers. If nil, no raw disco receiver is
|
||||
// running for the given family.
|
||||
@ -575,6 +580,30 @@ func newConn() *Conn {
|
||||
discoInfo: make(map[key.DiscoPublic]*discoInfo),
|
||||
}
|
||||
c.bind = &connBind{Conn: c, closed: true}
|
||||
c.receiveBatchPool = sync.Pool{New: func() any {
|
||||
msgs := make([]ipv6.Message, c.bind.BatchSize())
|
||||
for i := range msgs {
|
||||
msgs[i].Buffers = make([][]byte, 1)
|
||||
}
|
||||
batch := &receiveBatch{
|
||||
msgs: msgs,
|
||||
}
|
||||
return batch
|
||||
}}
|
||||
c.sendBatchPool = sync.Pool{New: func() any {
|
||||
ua := &net.UDPAddr{
|
||||
IP: make([]byte, 16),
|
||||
}
|
||||
msgs := make([]ipv6.Message, c.bind.BatchSize())
|
||||
for i := range msgs {
|
||||
msgs[i].Buffers = make([][]byte, 1)
|
||||
msgs[i].Addr = ua
|
||||
}
|
||||
return &sendBatch{
|
||||
ua: ua,
|
||||
msgs: msgs,
|
||||
}
|
||||
}}
|
||||
c.muCond = sync.NewCond(&c.mu)
|
||||
c.networkUp.Store(true) // assume up until told otherwise
|
||||
return c
|
||||
@ -1214,13 +1243,14 @@ func (c *Conn) LocalPort() uint16 {
|
||||
|
||||
func (c *Conn) networkDown() bool { return !c.networkUp.Load() }
|
||||
|
||||
func (c *Conn) Send(b []byte, ep conn.Endpoint) error {
|
||||
metricSendData.Add(1)
|
||||
func (c *Conn) Send(buffs [][]byte, ep conn.Endpoint) error {
|
||||
n := int64(len(buffs))
|
||||
metricSendData.Add(n)
|
||||
if c.networkDown() {
|
||||
metricSendDataNetworkDown.Add(1)
|
||||
metricSendDataNetworkDown.Add(n)
|
||||
return errNetworkDown
|
||||
}
|
||||
return ep.(*endpoint).send(b)
|
||||
return ep.(*endpoint).send(buffs)
|
||||
}
|
||||
|
||||
var errConnClosed = errors.New("Conn closed")
|
||||
@ -1229,6 +1259,46 @@ func (c *Conn) Send(b []byte, ep conn.Endpoint) error {
|
||||
|
||||
var errNoUDP = errors.New("no UDP available on platform")
|
||||
|
||||
var (
|
||||
// This acts as a compile-time check for our usage of ipv6.Message in
|
||||
// udpConnWithBatchOps for both IPv6 and IPv4 operations.
|
||||
_ ipv6.Message = ipv4.Message{}
|
||||
)
|
||||
|
||||
type sendBatch struct {
|
||||
ua *net.UDPAddr
|
||||
msgs []ipv6.Message // ipv4.Message and ipv6.Message are the same underlying type
|
||||
}
|
||||
|
||||
func (c *Conn) sendUDPBatch(addr netip.AddrPort, buffs [][]byte) (sent bool, err error) {
|
||||
batch := c.sendBatchPool.Get().(*sendBatch)
|
||||
defer c.sendBatchPool.Put(batch)
|
||||
|
||||
isIPv6 := false
|
||||
switch {
|
||||
case addr.Addr().Is4():
|
||||
case addr.Addr().Is6():
|
||||
isIPv6 = true
|
||||
default:
|
||||
panic("bogus sendUDPBatch addr type")
|
||||
}
|
||||
|
||||
as16 := addr.Addr().As16()
|
||||
copy(batch.ua.IP, as16[:])
|
||||
batch.ua.Port = int(addr.Port())
|
||||
for i, buff := range buffs {
|
||||
batch.msgs[i].Buffers[0] = buff
|
||||
batch.msgs[i].Addr = batch.ua
|
||||
}
|
||||
|
||||
if isIPv6 {
|
||||
_, err = c.pconn6.WriteBatch(batch.msgs[:len(buffs)], 0)
|
||||
} else {
|
||||
_, err = c.pconn4.WriteBatch(batch.msgs[:len(buffs)], 0)
|
||||
}
|
||||
return err == nil, err
|
||||
}
|
||||
|
||||
// sendUDP sends UDP packet b to ipp.
|
||||
// See sendAddr's docs on the return value meanings.
|
||||
func (c *Conn) sendUDP(ipp netip.AddrPort, b []byte) (sent bool, err error) {
|
||||
@ -1671,34 +1741,93 @@ func (c *Conn) runDerpWriter(ctx context.Context, dc *derphttp.Client, ch <-chan
|
||||
}
|
||||
}
|
||||
|
||||
// receiveIPv6 receives a UDP IPv6 packet. It is called by wireguard-go.
|
||||
func (c *Conn) receiveIPv6(b []byte) (int, conn.Endpoint, error) {
|
||||
type receiveBatch struct {
|
||||
msgs []ipv6.Message
|
||||
}
|
||||
|
||||
func (c *Conn) getReceiveBatch() *receiveBatch {
|
||||
batch := c.receiveBatchPool.Get().(*receiveBatch)
|
||||
return batch
|
||||
}
|
||||
|
||||
func (c *Conn) putReceiveBatch(batch *receiveBatch) {
|
||||
for i := range batch.msgs {
|
||||
batch.msgs[i] = ipv6.Message{Buffers: batch.msgs[i].Buffers}
|
||||
}
|
||||
c.receiveBatchPool.Put(batch)
|
||||
}
|
||||
|
||||
func (c *Conn) receiveIPv6(buffs [][]byte, sizes []int, eps []conn.Endpoint) (int, error) {
|
||||
health.ReceiveIPv6.Enter()
|
||||
defer health.ReceiveIPv6.Exit()
|
||||
|
||||
batch := c.getReceiveBatch()
|
||||
defer c.putReceiveBatch(batch)
|
||||
for {
|
||||
n, ipp, err := c.pconn6.ReadFromNetaddr(b)
|
||||
if err != nil {
|
||||
return 0, nil, err
|
||||
for i := range buffs {
|
||||
batch.msgs[i].Buffers[0] = buffs[i]
|
||||
}
|
||||
if ep, ok := c.receiveIP(b[:n], ipp, &c.ippEndpoint6, c.closeDisco6 == nil); ok {
|
||||
metricRecvDataIPv6.Add(1)
|
||||
return n, ep, nil
|
||||
numMsgs, err := c.pconn6.ReadBatch(batch.msgs, 0)
|
||||
if err != nil {
|
||||
if neterror.PacketWasTruncated(err) {
|
||||
// TODO(raggi): discuss whether to log?
|
||||
continue
|
||||
}
|
||||
return 0, err
|
||||
}
|
||||
|
||||
reportToCaller := false
|
||||
for i, msg := range batch.msgs[:numMsgs] {
|
||||
ipp := msg.Addr.(*net.UDPAddr).AddrPort()
|
||||
if ep, ok := c.receiveIP(msg.Buffers[0][:msg.N], ipp, &c.ippEndpoint6, c.closeDisco6 == nil); ok {
|
||||
metricRecvDataIPv6.Add(1)
|
||||
eps[i] = ep
|
||||
sizes[i] = msg.N
|
||||
reportToCaller = true
|
||||
} else {
|
||||
sizes[i] = 0
|
||||
}
|
||||
}
|
||||
|
||||
if reportToCaller {
|
||||
return numMsgs, nil
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// receiveIPv4 receives a UDP IPv4 packet. It is called by wireguard-go.
|
||||
func (c *Conn) receiveIPv4(b []byte) (n int, ep conn.Endpoint, err error) {
|
||||
func (c *Conn) receiveIPv4(buffs [][]byte, sizes []int, eps []conn.Endpoint) (int, error) {
|
||||
health.ReceiveIPv4.Enter()
|
||||
defer health.ReceiveIPv4.Exit()
|
||||
|
||||
batch := c.getReceiveBatch()
|
||||
defer c.putReceiveBatch(batch)
|
||||
for {
|
||||
n, ipp, err := c.pconn4.ReadFromNetaddr(b)
|
||||
if err != nil {
|
||||
return 0, nil, err
|
||||
for i := range buffs {
|
||||
batch.msgs[i].Buffers[0] = buffs[i]
|
||||
}
|
||||
if ep, ok := c.receiveIP(b[:n], ipp, &c.ippEndpoint4, c.closeDisco4 == nil); ok {
|
||||
metricRecvDataIPv4.Add(1)
|
||||
return n, ep, nil
|
||||
numMsgs, err := c.pconn4.ReadBatch(batch.msgs, 0)
|
||||
if err != nil {
|
||||
if neterror.PacketWasTruncated(err) {
|
||||
// TODO(raggi): discuss whether to log?
|
||||
continue
|
||||
}
|
||||
return 0, err
|
||||
}
|
||||
|
||||
reportToCaller := false
|
||||
for i, msg := range batch.msgs[:numMsgs] {
|
||||
ipp := msg.Addr.(*net.UDPAddr).AddrPort()
|
||||
if ep, ok := c.receiveIP(msg.Buffers[0][:msg.N], ipp, &c.ippEndpoint4, c.closeDisco4 == nil); ok {
|
||||
metricRecvDataIPv4.Add(1)
|
||||
eps[i] = ep
|
||||
sizes[i] = msg.N
|
||||
reportToCaller = true
|
||||
} else {
|
||||
sizes[i] = 0
|
||||
}
|
||||
}
|
||||
if reportToCaller {
|
||||
return numMsgs, nil
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -1748,27 +1877,25 @@ func (c *Conn) receiveIP(b []byte, ipp netip.AddrPort, cache *ippEndpointCache,
|
||||
return ep, true
|
||||
}
|
||||
|
||||
// receiveDERP reads a packet from c.derpRecvCh into b and returns the associated endpoint.
|
||||
// It is called by wireguard-go.
|
||||
//
|
||||
// If the packet was a disco message or the peer endpoint wasn't
|
||||
// found, the returned error is errLoopAgain.
|
||||
func (c *connBind) receiveDERP(b []byte) (n int, ep conn.Endpoint, err error) {
|
||||
func (c *connBind) receiveDERP(buffs [][]byte, sizes []int, eps []conn.Endpoint) (int, error) {
|
||||
health.ReceiveDERP.Enter()
|
||||
defer health.ReceiveDERP.Exit()
|
||||
|
||||
for dm := range c.derpRecvCh {
|
||||
if c.Closed() {
|
||||
break
|
||||
}
|
||||
n, ep := c.processDERPReadResult(dm, b)
|
||||
n, ep := c.processDERPReadResult(dm, buffs[0])
|
||||
if n == 0 {
|
||||
// No data read occurred. Wait for another packet.
|
||||
continue
|
||||
}
|
||||
metricRecvDataDERP.Add(1)
|
||||
return n, ep, nil
|
||||
sizes[0] = n
|
||||
eps[0] = ep
|
||||
return 1, nil
|
||||
}
|
||||
return 0, nil, net.ErrClosed
|
||||
return 0, net.ErrClosed
|
||||
}
|
||||
|
||||
func (c *Conn) processDERPReadResult(dm derpReadResult, b []byte) (n int, ep *endpoint) {
|
||||
@ -2645,6 +2772,16 @@ type connBind struct {
|
||||
closed bool
|
||||
}
|
||||
|
||||
func (c *connBind) BatchSize() int {
|
||||
// TODO(raggi): determine by properties rather than hardcoding platform behavior
|
||||
switch runtime.GOOS {
|
||||
case "linux":
|
||||
return conn.DefaultBatchSize
|
||||
default:
|
||||
return 1
|
||||
}
|
||||
}
|
||||
|
||||
// Open is called by WireGuard to create a UDP binding.
|
||||
// The ignoredPort comes from wireguard-go, via the wgcfg config.
|
||||
// We ignore that port value here, since we have the local port available easily.
|
||||
@ -2856,13 +2993,13 @@ func (c *Conn) bindSocket(ruc *RebindingUDPConn, network string, curPortFate cur
|
||||
defer ruc.mu.Unlock()
|
||||
|
||||
if runtime.GOOS == "js" {
|
||||
ruc.setConnLocked(newBlockForeverConn())
|
||||
ruc.setConnLocked(newBlockForeverConn(), "")
|
||||
return nil
|
||||
}
|
||||
|
||||
if debugAlwaysDERP() {
|
||||
c.logf("disabled %v per TS_DEBUG_ALWAYS_USE_DERP", network)
|
||||
ruc.setConnLocked(newBlockForeverConn())
|
||||
ruc.setConnLocked(newBlockForeverConn(), "")
|
||||
return nil
|
||||
}
|
||||
|
||||
@ -2897,7 +3034,7 @@ func (c *Conn) bindSocket(ruc *RebindingUDPConn, network string, curPortFate cur
|
||||
}
|
||||
trySetSocketBuffer(pconn, c.logf)
|
||||
// Success.
|
||||
ruc.setConnLocked(pconn)
|
||||
ruc.setConnLocked(pconn, network)
|
||||
if network == "udp4" {
|
||||
health.SetUDP4Unbound(false)
|
||||
}
|
||||
@ -2908,7 +3045,7 @@ func (c *Conn) bindSocket(ruc *RebindingUDPConn, network string, curPortFate cur
|
||||
// Set pconn to a dummy conn whose reads block until closed.
|
||||
// This keeps the receive funcs alive for a future in which
|
||||
// we get a link change and we can try binding again.
|
||||
ruc.setConnLocked(newBlockForeverConn())
|
||||
ruc.setConnLocked(newBlockForeverConn(), "")
|
||||
if network == "udp4" {
|
||||
health.SetUDP4Unbound(true)
|
||||
}
|
||||
@ -3005,6 +3142,51 @@ func (c *Conn) ParseEndpoint(nodeKeyStr string) (conn.Endpoint, error) {
|
||||
return ep, nil
|
||||
}
|
||||
|
||||
type batchReaderWriter interface {
|
||||
batchReader
|
||||
batchWriter
|
||||
}
|
||||
|
||||
type batchWriter interface {
|
||||
WriteBatch([]ipv6.Message, int) (int, error)
|
||||
}
|
||||
|
||||
type batchReader interface {
|
||||
ReadBatch([]ipv6.Message, int) (int, error)
|
||||
}
|
||||
|
||||
// udpConnWithBatchOps wraps a *net.UDPConn in order to extend it to support
|
||||
// batch operations.
|
||||
//
|
||||
// TODO(jwhited): This wrapping is temporary. https://github.com/golang/go/issues/45886
|
||||
type udpConnWithBatchOps struct {
|
||||
*net.UDPConn
|
||||
xpc batchReaderWriter
|
||||
}
|
||||
|
||||
func newUDPConnWithBatchOps(conn *net.UDPConn, network string) udpConnWithBatchOps {
|
||||
ucbo := udpConnWithBatchOps{
|
||||
UDPConn: conn,
|
||||
}
|
||||
switch network {
|
||||
case "udp4":
|
||||
ucbo.xpc = ipv4.NewPacketConn(conn)
|
||||
case "udp6":
|
||||
ucbo.xpc = ipv6.NewPacketConn(conn)
|
||||
default:
|
||||
panic("bogus network")
|
||||
}
|
||||
return ucbo
|
||||
}
|
||||
|
||||
func (u udpConnWithBatchOps) WriteBatch(ms []ipv6.Message, flags int) (int, error) {
|
||||
return u.xpc.WriteBatch(ms, flags)
|
||||
}
|
||||
|
||||
func (u udpConnWithBatchOps) ReadBatch(ms []ipv6.Message, flags int) (int, error) {
|
||||
return u.xpc.ReadBatch(ms, flags)
|
||||
}
|
||||
|
||||
// RebindingUDPConn is a UDP socket that can be re-bound.
|
||||
// Unix has no notion of re-binding a socket, so we swap it out for a new one.
|
||||
type RebindingUDPConn struct {
|
||||
@ -3022,9 +3204,28 @@ type RebindingUDPConn struct {
|
||||
port uint16
|
||||
}
|
||||
|
||||
func (c *RebindingUDPConn) setConnLocked(p nettype.PacketConn) {
|
||||
c.pconn = p
|
||||
c.pconnAtomic.Store(&p)
|
||||
// upgradePacketConn may upgrade a nettype.PacketConn to a udpConnWithBatchOps.
|
||||
func upgradePacketConn(p nettype.PacketConn, network string) nettype.PacketConn {
|
||||
uc, ok := p.(*net.UDPConn)
|
||||
if ok && runtime.GOOS == "linux" && (network == "udp4" || network == "udp6") {
|
||||
// Non-Linux does not support batch operations. x/net will fall back to
|
||||
// recv/sendmsg, but not all platforms have recv/sendmsg support. Keep
|
||||
// this simple for now.
|
||||
return newUDPConnWithBatchOps(uc, network)
|
||||
}
|
||||
return p
|
||||
}
|
||||
|
||||
// setConnLocked sets the provided nettype.PacketConn. It should be called only
|
||||
// after acquiring RebindingUDPConn.mu. It upgrades the provided
|
||||
// nettype.PacketConn to a udpConnWithBatchOps when appropriate. This upgrade
|
||||
// is intentionally pushed closest to where read/write ops occur in order to
|
||||
// avoid disrupting surrounding code that assumes nettype.PacketConn is a
|
||||
// *net.UDPConn.
|
||||
func (c *RebindingUDPConn) setConnLocked(p nettype.PacketConn, network string) {
|
||||
upc := upgradePacketConn(p, network)
|
||||
c.pconn = upc
|
||||
c.pconnAtomic.Store(&upc)
|
||||
c.port = uint16(c.localAddrLocked().Port)
|
||||
}
|
||||
|
||||
@ -3087,6 +3288,60 @@ func (c *RebindingUDPConn) ReadFromNetaddr(b []byte) (n int, ipp netip.AddrPort,
|
||||
}
|
||||
}
|
||||
|
||||
func (c *RebindingUDPConn) WriteBatch(msgs []ipv6.Message, flags int) (int, error) {
|
||||
var (
|
||||
n int
|
||||
err error
|
||||
start int
|
||||
)
|
||||
for {
|
||||
pconn := *c.pconnAtomic.Load()
|
||||
bw, ok := pconn.(batchWriter)
|
||||
if !ok {
|
||||
for _, msg := range msgs {
|
||||
_, err = pconn.WriteTo(msg.Buffers[0], msg.Addr)
|
||||
if err != nil {
|
||||
return n, err
|
||||
}
|
||||
n++
|
||||
}
|
||||
return n, nil
|
||||
}
|
||||
|
||||
n, err = bw.WriteBatch(msgs[start:], flags)
|
||||
if err != nil {
|
||||
if pconn != c.currentConn() {
|
||||
continue
|
||||
}
|
||||
return n, err
|
||||
} else if n == len(msgs[start:]) {
|
||||
return len(msgs), nil
|
||||
} else {
|
||||
start += n
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (c *RebindingUDPConn) ReadBatch(msgs []ipv6.Message, flags int) (int, error) {
|
||||
for {
|
||||
pconn := *c.pconnAtomic.Load()
|
||||
br, ok := pconn.(batchReader)
|
||||
if !ok {
|
||||
var err error
|
||||
msgs[0].N, msgs[0].Addr, err = c.ReadFrom(msgs[0].Buffers[0])
|
||||
if err == nil {
|
||||
return 1, nil
|
||||
}
|
||||
return 0, err
|
||||
}
|
||||
n, err := br.ReadBatch(msgs, flags)
|
||||
if err != nil && pconn != c.currentConn() {
|
||||
continue
|
||||
}
|
||||
return n, err
|
||||
}
|
||||
}
|
||||
|
||||
func (c *RebindingUDPConn) Port() uint16 {
|
||||
c.mu.Lock()
|
||||
defer c.mu.Unlock()
|
||||
@ -3175,6 +3430,20 @@ func (c *blockForeverConn) WriteToUDPAddrPort(p []byte, addr netip.AddrPort) (in
|
||||
return len(p), nil
|
||||
}
|
||||
|
||||
func (c *blockForeverConn) ReadBatch(p []ipv6.Message, flags int) (int, error) {
|
||||
c.mu.Lock()
|
||||
for !c.closed {
|
||||
c.cond.Wait()
|
||||
}
|
||||
c.mu.Unlock()
|
||||
return 0, net.ErrClosed
|
||||
}
|
||||
|
||||
func (c *blockForeverConn) WriteBatch(p []ipv6.Message, flags int) (int, error) {
|
||||
// Silently drop writes.
|
||||
return len(p), nil
|
||||
}
|
||||
|
||||
func (c *blockForeverConn) LocalAddr() net.Addr {
|
||||
// Return a *net.UDPAddr because lots of code assumes that it will.
|
||||
return new(net.UDPAddr)
|
||||
@ -3302,7 +3571,7 @@ func ippDebugString(ua netip.AddrPort) string {
|
||||
return ua.String()
|
||||
}
|
||||
|
||||
// endpointSendFunc is a func that writes an encrypted Wireguard payload from
|
||||
// endpointSendFunc is a func that writes encrypted Wireguard payloads from
|
||||
// WireGuard to a peer. It might write via UDP, DERP, both, or neither.
|
||||
//
|
||||
// What these funcs should NOT do is too much work. Minimize use of mutexes, map
|
||||
@ -3313,7 +3582,7 @@ func ippDebugString(ua netip.AddrPort) string {
|
||||
//
|
||||
// A nil value means the current fast path has expired and needs to be
|
||||
// recalculated.
|
||||
type endpointSendFunc func([]byte) error
|
||||
type endpointSendFunc func([][]byte) error
|
||||
|
||||
// discoEndpoint is a wireguard/conn.Endpoint that picks the best
|
||||
// available path to communicate with a peer, based on network
|
||||
@ -3629,9 +3898,9 @@ func (de *endpoint) cliPing(res *ipnstate.PingResult, cb func(*ipnstate.PingResu
|
||||
de.noteActiveLocked()
|
||||
}
|
||||
|
||||
func (de *endpoint) send(b []byte) error {
|
||||
func (de *endpoint) send(buffs [][]byte) error {
|
||||
if fn := de.sendFunc.Load(); fn != nil {
|
||||
return fn(b)
|
||||
return fn(buffs)
|
||||
}
|
||||
|
||||
de.mu.Lock()
|
||||
@ -3656,21 +3925,30 @@ func (de *endpoint) send(b []byte) error {
|
||||
}
|
||||
var err error
|
||||
if udpAddr.IsValid() {
|
||||
_, err = de.c.sendAddr(udpAddr, de.publicKey, b)
|
||||
_, err = de.c.sendUDPBatch(udpAddr, buffs)
|
||||
// TODO(raggi): needs updating for accuracy, as in error conditions we may have partial sends.
|
||||
if stats := de.c.stats.Load(); err == nil && stats != nil {
|
||||
stats.UpdateTxPhysical(de.nodeAddr, udpAddr, len(b))
|
||||
var txBytes int
|
||||
for _, b := range buffs {
|
||||
txBytes += len(b)
|
||||
}
|
||||
stats.UpdateTxPhysical(de.nodeAddr, udpAddr, txBytes)
|
||||
}
|
||||
}
|
||||
if derpAddr.IsValid() {
|
||||
if ok, _ := de.c.sendAddr(derpAddr, de.publicKey, b); ok {
|
||||
allOk := true
|
||||
for _, buff := range buffs {
|
||||
ok, _ := de.c.sendAddr(derpAddr, de.publicKey, buff)
|
||||
if stats := de.c.stats.Load(); stats != nil {
|
||||
stats.UpdateTxPhysical(de.nodeAddr, derpAddr, len(b))
|
||||
stats.UpdateTxPhysical(de.nodeAddr, derpAddr, len(buff))
|
||||
}
|
||||
if err != nil {
|
||||
// UDP failed but DERP worked, so good enough:
|
||||
return nil
|
||||
if !ok {
|
||||
allOk = false
|
||||
}
|
||||
}
|
||||
if allOk {
|
||||
return nil
|
||||
}
|
||||
}
|
||||
return err
|
||||
}
|
||||
|
||||
@ -29,6 +29,7 @@
|
||||
|
||||
"go4.org/mem"
|
||||
"golang.org/x/exp/maps"
|
||||
wgconn "golang.zx2c4.com/wireguard/conn"
|
||||
"golang.zx2c4.com/wireguard/device"
|
||||
"golang.zx2c4.com/wireguard/tun/tuntest"
|
||||
"tailscale.com/derp"
|
||||
@ -364,9 +365,12 @@ func TestNewConn(t *testing.T) {
|
||||
conn.SetPrivateKey(key.NewNode())
|
||||
|
||||
go func() {
|
||||
var pkt [64 << 10]byte
|
||||
pkts := make([][]byte, 1)
|
||||
sizes := make([]int, 1)
|
||||
eps := make([]wgconn.Endpoint, 1)
|
||||
pkts[0] = make([]byte, 64<<10)
|
||||
for {
|
||||
_, _, err := conn.receiveIPv4(pkt[:])
|
||||
_, err := conn.receiveIPv4(pkts, sizes, eps)
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
@ -1262,17 +1266,20 @@ func setUpReceiveFrom(tb testing.TB) (roundTrip func()) {
|
||||
for i := range sendBuf {
|
||||
sendBuf[i] = 'x'
|
||||
}
|
||||
buf := make([]byte, 2<<10)
|
||||
buffs := make([][]byte, 1)
|
||||
buffs[0] = make([]byte, 2<<10)
|
||||
sizes := make([]int, 1)
|
||||
eps := make([]wgconn.Endpoint, 1)
|
||||
return func() {
|
||||
if _, err := sendConn.WriteTo(sendBuf, dstAddr); err != nil {
|
||||
tb.Fatalf("WriteTo: %v", err)
|
||||
}
|
||||
n, ep, err := conn.receiveIPv4(buf)
|
||||
n, err := conn.receiveIPv4(buffs, sizes, eps)
|
||||
if err != nil {
|
||||
tb.Fatal(err)
|
||||
}
|
||||
_ = n
|
||||
_ = ep
|
||||
_ = eps
|
||||
}
|
||||
}
|
||||
|
||||
@ -1330,6 +1337,9 @@ func TestGoMajorVersion(t *testing.T) {
|
||||
}
|
||||
|
||||
func TestReceiveFromAllocs(t *testing.T) {
|
||||
// TODO(jwhited): we are back to nonzero alloc due to our use of x/net until
|
||||
// https://github.com/golang/go/issues/45886 is implemented.
|
||||
t.Skip("alloc tests are skipped until https://github.com/golang/go/issues/45886 is implemented and plumbed.")
|
||||
if racebuild.On {
|
||||
t.Skip("alloc tests are unreliable with -race")
|
||||
}
|
||||
@ -1481,9 +1491,12 @@ func TestRebindStress(t *testing.T) {
|
||||
|
||||
errc := make(chan error, 1)
|
||||
go func() {
|
||||
buf := make([]byte, 1500)
|
||||
buffs := make([][]byte, 1)
|
||||
sizes := make([]int, 1)
|
||||
eps := make([]wgconn.Endpoint, 1)
|
||||
buffs[0] = make([]byte, 1500)
|
||||
for {
|
||||
_, _, err := conn.receiveIPv4(buf)
|
||||
_, err := conn.receiveIPv4(buffs, sizes, eps)
|
||||
if ctx.Err() != nil {
|
||||
errc <- nil
|
||||
return
|
||||
@ -1813,6 +1826,6 @@ func TestRebindingUDPConn(t *testing.T) {
|
||||
t.Fatal(err)
|
||||
}
|
||||
defer realConn.Close()
|
||||
c.setConnLocked(realConn.(nettype.PacketConn))
|
||||
c.setConnLocked(newBlockForeverConn())
|
||||
c.setConnLocked(realConn.(nettype.PacketConn), "udp4")
|
||||
c.setConnLocked(newBlockForeverConn(), "")
|
||||
}
|
||||
|
||||
@ -213,18 +213,18 @@ func newNilTun() tun.Device {
|
||||
}
|
||||
}
|
||||
|
||||
func (t *nilTun) File() *os.File { return nil }
|
||||
func (t *nilTun) Flush() error { return nil }
|
||||
func (t *nilTun) MTU() (int, error) { return 1420, nil }
|
||||
func (t *nilTun) Name() (string, error) { return "niltun", nil }
|
||||
func (t *nilTun) Events() chan tun.Event { return t.events }
|
||||
func (t *nilTun) File() *os.File { return nil }
|
||||
func (t *nilTun) Flush() error { return nil }
|
||||
func (t *nilTun) MTU() (int, error) { return 1420, nil }
|
||||
func (t *nilTun) Name() (string, error) { return "niltun", nil }
|
||||
func (t *nilTun) Events() <-chan tun.Event { return t.events }
|
||||
|
||||
func (t *nilTun) Read(data []byte, offset int) (int, error) {
|
||||
func (t *nilTun) Read(data [][]byte, sizes []int, offset int) (int, error) {
|
||||
<-t.closed
|
||||
return 0, io.EOF
|
||||
}
|
||||
|
||||
func (t *nilTun) Write(data []byte, offset int) (int, error) {
|
||||
func (t *nilTun) Write(data [][]byte, offset int) (int, error) {
|
||||
<-t.closed
|
||||
return 0, io.EOF
|
||||
}
|
||||
@ -235,18 +235,21 @@ func (t *nilTun) Close() error {
|
||||
return nil
|
||||
}
|
||||
|
||||
func (t *nilTun) BatchSize() int { return 1 }
|
||||
|
||||
// A noopBind is a conn.Bind that does no actual binding work.
|
||||
type noopBind struct{}
|
||||
|
||||
func (noopBind) Open(port uint16) (fns []conn.ReceiveFunc, actualPort uint16, err error) {
|
||||
return nil, 1, nil
|
||||
}
|
||||
func (noopBind) Close() error { return nil }
|
||||
func (noopBind) SetMark(mark uint32) error { return nil }
|
||||
func (noopBind) Send(b []byte, ep conn.Endpoint) error { return nil }
|
||||
func (noopBind) Close() error { return nil }
|
||||
func (noopBind) SetMark(mark uint32) error { return nil }
|
||||
func (noopBind) Send(b [][]byte, ep conn.Endpoint) error { return nil }
|
||||
func (noopBind) ParseEndpoint(s string) (conn.Endpoint, error) {
|
||||
return dummyEndpoint(s), nil
|
||||
}
|
||||
func (noopBind) BatchSize() int { return 1 }
|
||||
|
||||
// A dummyEndpoint is a string holding the endpoint destination.
|
||||
type dummyEndpoint string
|
||||
|
||||
Loading…
Reference in New Issue
Block a user