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netcheck,portmapper,magicsock: ignore some UDP write errors on Linux

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Treat UDP send EPERM errors as a lost UDP packet, not something super
fatal. That's just the Linux firewall preventing it from going out.

And add a leaf package net/neterror for that (and future) policy that
all three packages can share, with tests.

Updates #3619

Change-Id: Ibdb838c43ee9efe70f4f25f7fc7fdf4607ba9c1d
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-12-30 11:11:50 -08:00
committed by Brad Fitzpatrick
parent 2c94e3c4ad
commit 7d9b1de3aa
7 changed files with 115 additions and 4 deletions
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cmd/tailscaled/depaware.txt
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@@ -195,6 +195,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/net/flowtrack from tailscale.com/net/packet+
💣 tailscale.com/net/interfaces from tailscale.com/cmd/tailscaled+
tailscale.com/net/netcheck from tailscale.com/wgengine/magicsock
tailscale.com/net/neterror from tailscale.com/net/netcheck+
tailscale.com/net/netknob from tailscale.com/logpolicy+
tailscale.com/net/netns from tailscale.com/cmd/tailscaled+
💣 tailscale.com/net/netstat from tailscale.com/ipn/ipnserver