/* * Copyright (c) 2016 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /** * FIB attached export * * what's it all about? * say one does this: * set int ip table Gig0 2 * set int ip addr Gig0 10.0.0.1/24 * Ggi0 is in table 2 with a connected address. * Now we add a routing matching said connected in a different table * ip route add table 3 10.0.0.0/24 via Gig0 * How do we expect traffic in table 3 to be forwarded? Clearly out of * Ggi0. It's an attached route, hence we are saying that we can ARP for * hosts in the attached subnet. and we can. but any ARP entries we send * we be received on Gig0, but since Gig0 is in table 2, it will install * the adj-fins in table 2. So traffic in table 3 will never hit an adj-fib * and hence always the glean, and so thus be effectively dropped. * How do we fix this? Attached Export !! All more specfiic entries in table 2 * that track and are covered by the connected are automatically exported into * table 3. Now table 3 also has adj-fibs (and the local) so traffic to hosts * is restored. */ #ifndef __FIB_ATTACHED_EXPORT_H__ #define __FIB_ATTACHED_EXPORT_H__ #include extern void fib_attached_export_import(fib_entry_t *fib_entry, fib_node_index_t export_fib); extern void fib_attached_export_purge(fib_entry_t *fib_entry); extern void fib_attached_export_covered_added(fib_entry_t *cover, fib_node_index_t covered); extern void fib_attached_export_covered_removed(fib_entry_t *cover, fib_node_index_t covered); extern void fib_attached_export_cover_change(fib_entry_t *fib_entry); extern void fib_attached_export_cover_update(fib_entry_t *fib_entry); extern u8* fib_ae_import_format(fib_entry_t *fib_entry, u8*s); extern u8* fib_ae_export_format(fib_entry_t *fib_entry, u8*s); #endif