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bpo-33433 Fix private address checking for IPv4 mapped IPv6. (GH-26172)

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For IPv4 mapped IPv6 addresses, defer privacy check to the mapped IPv4 address. Solves bug where public mapped IPv4 addresses are considered private by the IPv6 check.

Automerge-Triggered-By: GH:gpshead
This commit is contained in:
Pete Wicken 2021-05-17 08:52:36 +01:00 • committed by GitHub
parent c10392e7dd
commit 83f0f8d62f
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3 changed files with 13 additions and 1 deletions
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7
Lib/ipaddress.py
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@ -16,6 +16,7 @@ import functools
IPV4LENGTH = 32
IPV6LENGTH = 128
class AddressValueError(ValueError):
"""A Value Error related to the address."""
@ -2002,9 +2003,13 @@ class IPv6Address(_BaseV6, _BaseAddress):
Returns:
A boolean, True if the address is reserved per
iana-ipv6-special-registry.
iana-ipv6-special-registry, or is ipv4_mapped and is
reserved in the iana-ipv4-special-registry.
"""
ipv4_mapped = self.ipv4_mapped
if ipv4_mapped is not None:
return ipv4_mapped.is_private
return any(self in net for net in self._constants._private_networks)
@property