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When re-configuring the NIC router, determine for each domain if at least one interface stays with the domain. If a domain fullfills this and has a dynamic IP config (received via a DHCP client), keep the IP config. To achieve this, the following changes have been made to the existing NIC router code: * Split-up Interface::handle_config into three steps: 1) Determine for each interface if its domain can keep its IP config or or if it has to mark it invalid. This must be done before (re-)attaching any interface because during "attach" several decisions are made based on the validity of the IP config of corresponding the domain. (E.g. whether to participate in sending DHCP DISCOVERs {IP config invalid} or whether to participate in sending pending ARP REQUESTs {IP config valid} ). 2) Detach, attach, or re-attach each interface according to the configuration. This must be done before re-considering the temporary state objects of each interface because the latter might have effects on the interfaces of remote domains which must then be in place already. 3) Re-consider temporary state objects of each interface. (E.g. transport layer connection states) * Re-work IP-config setter in a way that it works as follows: 1) If the old IP config is valid, let all local interfaces as well as remote interfaces that depend on the IP config of the domain detach from the old IP config. 2) Overwrite with new IP config 3) If the new IP config is valid, let all local interfaces as well as remote interfaces that depend on the IP config of the domain attach to the new IP config. Issue #2815
This source-code repository contains genuine low-level OS components and interfaces of Genode. It solely depends on the framework's base API.