Aritra Basu
dadc77c5fb
When the tracked IPv6 link-local address is removed, networkd clears link->ipv6ll_address, but keeps DHCPv6, NDisc, and RADV running. These engines keep using a stale source identity which affects the following: - DHCPv6 client continues to send Solicit/Renew/Rebind from a nonexistent source address. - NDisc continues to send Router Solicitations from a nonexistent source address. Router Advertisements cannot be received properly. - RADV continues to advertise with a stale source address. This can lead to downstream hosts configuring invalid routes. - DHCP-PD prefixes remain configured without a valid upstream DHCPv6 path. Added link_ipv6ll_lost() to stop IPv6 dynamic engines and related states: - sd_dhcp6_client_stop() - ndisc_stop() + ndisc_flush() - sd_radv_stop() This is called from address_drop() when the dropped address matches the tracked IPv6LL. After clearing the tracked address, it scans for another ready link-local address on the interface. If found, this is set as link->ipv6ll_address and link_ipv6ll_gained() is called to restart the engines with the new source identity. This resolves the FIXME in address_drop(). Signed-off-by: Aritra Basu <aritrbas+gh@cisco.com>
System and Service Manager
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