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gh-117566: fix IPv6Address.is_loopback for IPv4-mapped loopbacks (GH-117567)

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While properties like IPv6Address.is_private account for IPv4-mapped
IPv6 addresses, such as for example:

    >>> ipaddress.ip_address("192.168.0.1").is_private
    True
    >>> ipaddress.ip_address("::ffff:192.168.0.1").is_private
    True
...the same doesn't currently apply to the is_loopback property:
    >>> ipaddress.ip_address("127.0.0.1").is_loopback
    True
    >>> ipaddress.ip_address("::ffff:127.0.0.1").is_loopback
    False

At minimum, this inconsistency between different properties is
counter-intuitive. Moreover, ::ffff:127.0.0.0/104 is for all intents and
purposes a loopback address, and should be treated as such.
This commit is contained in:
Faidon Liambotis 2024-04-25 18:17:40 +03:00 • committed by GitHub
parent eb20a7d12c
commit fb7f79b4da
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3 changed files with 23 additions and 1 deletions
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5
Lib/ipaddress.py
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@ -2142,6 +2142,9 @@ class IPv6Address(_BaseV6, _BaseAddress):
RFC 2373 2.5.3.
"""
ipv4_mapped = self.ipv4_mapped
if ipv4_mapped is not None:
return ipv4_mapped.is_loopback
return self._ip == 1
@property
@ -2258,7 +2261,7 @@ class IPv6Interface(IPv6Address):
@property
def is_loopback(self):
return self._ip == 1 and self.network.is_loopback
return super().is_loopback and self.network.is_loopback
class IPv6Network(_BaseV6, _BaseNetwork):