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by filter function instead of picking into routing table details in each consumer. Remove now-unused rt_expunge() (eliminating last external RTF_RNH_LOCKED user). This simplifies future nexthops/mulitipath changes and rtrequest1_fib() locking refactoring. Actual changes: Add "rt_chain" field to permit rte grouping while doing batched delete from routing table (thus growing rte 200->208 on amd64). Add "rti_filter" / "rti_filterdata" / "rti_spare" fields to rt_addrinfo to pass filter function to various routing subsystems in standard way. Convert all rt_expunge() customers to new rt_addinfo-based api and eliminate rt_expunge().
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