Yu Watanabe
6174dc7d96
Previously, even if a .network file contains multiple IPv6 null addresses with different prefix length, only the first setting is applied, as the remainings are deduped in network_drop_invalid_addresses(). Even though the kernel allows us to change the prefix length of an existing IPv6 address, we cannot safely change the prefix length of an address that is originally requested as a null address, as the prefix of the address may conflict with other addresses if we change it. We already prohibit to change the prefix length of an existing IPv6 address that is originally requested as a null address. So, we can safely allow to configure multiple IPv6 addresses from null addresses by relaxing the dedup logic. The dedup is govern by the hash_ops. This adds a special handling for IPv6 null addresses.
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