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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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2
wgengine/netstack/netstack.go
View File

@@ -1086,7 +1086,7 @@ func (ns *Impl) handleMagicDNSUDP(srcAddr netip.AddrPort, c *gonet.UDPConn) {
}
return
}
resp, err := ns.dns.Query(context.Background(), q[:n], srcAddr)
resp, err := ns.dns.Query(context.Background(), q[:n], "udp", srcAddr)
if err != nil {
ns.logf("dns udp query: %v", err)
return