77d65e5659
Try to ensure kernel IPv6 link local address generation occurs by setting the per-if addr_gen_mode sysctl when the link is already up, instead of the netlink interface (IFLA_INET6_ADDR_GEN_MODE). The netlink setting is sufficient in cases where the interface is not yet up when networkd configures an interface - bringing the interface up will trigger in-kernel address generation. If the interface is already up, yet the interface has no IPv6LL assigned setting IFLA_INET6_ADDR_GEN_MODE has no effect. Writing the addr_gen_mode sysctl is a best effort attempt at triggering address generation regardless of interface state because it also works in cases where the interface is already up. Fixes #22424.
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