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wgengine/magicsock: use AF_PACKET socket + BPF to read disco messages

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This is entirely optional (i.e. failing in this code is non-fatal) and
only enabled on Linux for now. Additionally, this new behaviour can be
disabled by setting the TS_DEBUG_DISABLE_AF_PACKET environment variable.

Updates #3824
Replaces #5474

Co-authored-by: Andrew Dunham <andrew@du.nham.ca>
Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
Andrew Dunham
2022-08-29 10:57:54 -04:00
committed by Dave Anderson
parent 58f35261d0
commit c72caa6672
5 changed files with 347 additions and 5 deletions
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cmd/tailscaled/depaware.txt
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@@ -290,7 +290,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
W tailscale.com/wf from tailscale.com/cmd/tailscaled
tailscale.com/wgengine from tailscale.com/ipn/ipnlocal+
tailscale.com/wgengine/filter from tailscale.com/control/controlclient+
tailscale.com/wgengine/magicsock from tailscale.com/ipn/ipnlocal+
💣 tailscale.com/wgengine/magicsock from tailscale.com/ipn/ipnlocal+
tailscale.com/wgengine/monitor from tailscale.com/control/controlclient+
tailscale.com/wgengine/netstack from tailscale.com/cmd/tailscaled+
tailscale.com/wgengine/router from tailscale.com/ipn/ipnlocal+