/* * 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. */ #include <vnet/fib/fib_entry_cover.h> #include <vnet/fib/fib_entry_src.h> #include <vnet/fib/fib_node_list.h> #include <vnet/fib/fib_entry_delegate.h> u32 fib_entry_cover_track (fib_entry_t* cover, fib_node_index_t covered) { fib_entry_delegate_t *fed; FIB_ENTRY_DBG(cover, "cover-track %d", covered); ASSERT(fib_entry_get_index(cover) != covered); fed = fib_entry_delegate_find(cover, FIB_ENTRY_DELEGATE_COVERED); if (NULL == fed) { fed = fib_entry_delegate_find_or_add(cover, FIB_ENTRY_DELEGATE_COVERED); fed->fd_list = fib_node_list_create(); } return (fib_node_list_push_front(fed->fd_list, 0, FIB_NODE_TYPE_ENTRY, covered)); } void fib_entry_cover_untrack (fib_entry_t* cover, u32 tracked_index) { fib_entry_delegate_t *fed; FIB_ENTRY_DBG(cover, "cover-untrack @ %d", tracked_index); fed = fib_entry_delegate_find(cover, FIB_ENTRY_DELEGATE_COVERED); if (NULL == fed) return; fib_node_list_remove(fed->fd_list, tracked_index); if (0 == fib_node_list_get_size(fed->fd_list)) { fib_node_list_destroy(&fed->fd_list); fib_entry_delegate_remove(cover, FIB_ENTRY_DELEGATE_COVERED); } } /** * Internal struct to hold user supplied parameters for the cover walk */ typedef struct fib_enty_cover_walk_ctx_t_ { fib_entry_t *cover; fib_entry_covered_walk_t walk; void *ctx; } fib_enty_cover_walk_ctx_t; static walk_rc_t fib_entry_cover_walk_node_ptr (fib_node_ptr_t *depend, void *args) { fib_enty_cover_walk_ctx_t *ctx = args; ctx->walk(ctx->cover, depend->fnp_index, ctx->ctx); return (WALK_CONTINUE); } void fib_entry_cover_walk (fib_entry_t *cover, fib_entry_covered_walk_t walk, void *args) { fib_entry_delegate_t *fed; fed = fib_entry_delegate_find(cover, FIB_ENTRY_DELEGATE_COVERED); if (NULL == fed) return; fib_enty_cover_walk_ctx_t ctx = { .cover = cover, .walk = walk, .ctx = args, }; fib_node_list_walk(fed->fd_list, fib_entry_cover_walk_node_ptr, &ctx); } static walk_rc_t fib_entry_cover_change_one (fib_entry_t *cover, fib_node_index_t covered, void *args) { fib_node_index_t new_cover; /* * The 3 entries involved here are: * cover - the least specific. It will cover both the others * new_cover - the enty just inserted below the cover * covered - the entry that was tracking the cover. * * The checks below are to determine if new_cover is a cover for covered. */ new_cover = pointer_to_uword(args); if (FIB_NODE_INDEX_INVALID == new_cover) { /* * nothing has been inserted, which implies the cover was removed. * 'cover' is thus the new cover. */ fib_entry_cover_changed(covered); } else if (new_cover != covered) { const fib_prefix_t *pfx_covered, *pfx_new_cover; pfx_covered = fib_entry_get_prefix(covered); pfx_new_cover = fib_entry_get_prefix(new_cover); if (fib_prefix_is_cover(pfx_new_cover, pfx_covered)) { fib_entry_cover_changed(covered); } } return (WALK_CONTINUE); } void fib_entry_cover_change_notify (fib_node_index_t cover_index, fib_node_index_t covered) { fib_entry_t *cover; cover = fib_entry_get(cover_index); fib_entry_cover_walk(cover, fib_entry_cover_change_one, uword_to_pointer(covered, void*)); } static walk_rc_t fib_entry_cover_update_one (fib_entry_t *cover, fib_node_index_t covered, void *args) { fib_entry_cover_updated(covered); return (WALK_CONTINUE); } void fib_entry_cover_update_notify (fib_entry_t *fib_entry) { fib_entry_cover_walk(fib_entry, fib_entry_cover_update_one, NULL); }