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net: IPv6 network does not contain IPv4 to IPv6 translated addresses #37597

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pixelbender opened this issue Mar 2, 2020 · 2 comments
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@pixelbender
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What version of Go are you using (go version)?

1.14

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

All operating system and processor architectures

What did you do?

https://play.golang.org/p/IN-TOcROQnr

// "8.8.8.8" translated to IPv6, same as net.ParseIP("8.8.8.8")
ip := net.ParseIP("0:0:0:0:0:ffff:808:808")

_, ipv4, _ := net.ParseCIDR("0.0.0.0/0")
fmt.Println(ipv4.Contains(ip)) // true

_, ipv6, _ := net.ParseCIDR("::/0")
fmt.Println(ipv6.Contains(ip)) // why it says false?

_, translated, _ := net.ParseCIDR("::ffff:0:0/96")
fmt.Println(translated.Contains(ip)) // true

What did you expect to see?

true
true
true

What did you see instead?

true
false
true
@gopherbot
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Change https://golang.org/cl/221798 mentions this issue: net: IPv6 network does not contain IPv4 to IPv6 translated addresses

@dmitshur dmitshur added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Mar 2, 2020
@dmitshur dmitshur added this to the Backlog milestone Mar 2, 2020
@dmitshur
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dmitshur commented Mar 2, 2020

/cc @mikioh @bradfitz @ianlancetaylor per owners.

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