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net/dns: retry forwarder requests over TCP

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We weren't correctly retrying truncated requests to an upstream DNS
server with TCP. Instead, we'd return a truncated request to the user,
even if the user was querying us over TCP and thus able to handle a
large response.

Also, add an envknob and controlknob to allow users/us to disable this
behaviour if it turns out to be buggy (✨ DNS ✨).

Updates #9264

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: Ifb04b563839a9614c0ba03e9c564e8924c1a2bfd
This commit is contained in:
Andrew Dunham
2023-09-07 16:27:50 -04:00
parent 098d110746
commit 530aaa52f1
13 changed files with 448 additions and 49 deletions
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1
net/sockstats/sockstats.go
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@@ -51,6 +51,7 @@ const (
LabelMagicsockConnUDP6 Label = 9 // wgengine/magicsock/magicsock.go
LabelNetlogLogger Label = 10 // wgengine/netlog/logger.go
LabelSockstatlogLogger Label = 11 // log/sockstatlog/logger.go
LabelDNSForwarderTCP Label = 12 // net/dns/resolver/forwarder.go
)
// WithSockStats instruments a context so that sockets created with it will