diff options
Diffstat (limited to 'src/vnet/mfib/mfib_entry_cover.c')
| -rw-r--r-- | src/vnet/mfib/mfib_entry_cover.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/src/vnet/mfib/mfib_entry_cover.c b/src/vnet/mfib/mfib_entry_cover.c new file mode 100644 index 00000000000..6caeb1b6928 --- /dev/null +++ b/src/vnet/mfib/mfib_entry_cover.c @@ -0,0 +1,180 @@ +/* + * 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/mfib/mfib_entry_cover.h> +#include <vnet/mfib/mfib_entry_src.h> +#include <vnet/fib/fib_node_list.h> + +u32 +mfib_entry_cover_track (mfib_entry_t* cover, + fib_node_index_t covered) +{ + mfib_entry_delegate_t *mfed; + + MFIB_ENTRY_DBG(cover, "cover-track %d", covered); + + ASSERT(mfib_entry_get_index(cover) != covered); + + mfed = mfib_entry_delegate_get(cover, MFIB_ENTRY_DELEGATE_COVERED); + + if (NULL == mfed) + { + mfed = mfib_entry_delegate_find_or_add(cover, MFIB_ENTRY_DELEGATE_COVERED); + mfed->mfd_list = fib_node_list_create(); + } + + return (fib_node_list_push_front(mfed->mfd_list, + 0, FIB_NODE_TYPE_MFIB_ENTRY, + covered)); +} + +void +mfib_entry_cover_untrack (mfib_entry_t* cover, + u32 tracked_index) +{ + mfib_entry_delegate_t *mfed; + + MFIB_ENTRY_DBG(cover, "cover-untrack @ %d", tracked_index); + + mfed = mfib_entry_delegate_get(cover, MFIB_ENTRY_DELEGATE_COVERED); + + if (NULL == mfed) + return; + + fib_node_list_remove(mfed->mfd_list, tracked_index); + + if (0 == fib_node_list_get_size(mfed->mfd_list)) + { + fib_node_list_destroy(&mfed->mfd_list); + mfib_entry_delegate_remove(cover, MFIB_ENTRY_DELEGATE_COVERED); + } +} + +/** + * Internal struct to hold user supplied paraneters for the cover walk + */ +typedef struct mfib_enty_cover_walk_ctx_t_ { + mfib_entry_t *cover; + mfib_entry_covered_walk_t walk; + void *ctx; +} mfib_enty_cover_walk_ctx_t; + +static int +mfib_entry_cover_walk_node_ptr (fib_node_ptr_t *depend, + void *args) +{ + mfib_enty_cover_walk_ctx_t *ctx = args; + + ctx->walk(ctx->cover, depend->fnp_index, ctx->ctx); + + /* continue */ + return (1); +} + +void +mfib_entry_cover_walk (mfib_entry_t *cover, + mfib_entry_covered_walk_t walk, + void *args) +{ + mfib_entry_delegate_t *mfed; + + mfed = mfib_entry_delegate_get(cover, MFIB_ENTRY_DELEGATE_COVERED); + + if (NULL == mfed) + return; + + mfib_enty_cover_walk_ctx_t ctx = { + .cover = cover, + .walk = walk, + .ctx = args, + }; + + fib_node_list_walk(mfed->mfd_list, + mfib_entry_cover_walk_node_ptr, + &ctx); +} + +static int +mfib_entry_cover_change_one (mfib_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. + */ + mfib_entry_cover_changed(covered); + } + else if (new_cover != covered) + { + const mfib_prefix_t *pfx_covered, *pfx_new_cover; + + pfx_covered = mfib_entry_get_prefix(covered); + pfx_new_cover = mfib_entry_get_prefix(new_cover); + + if (mfib_prefix_is_cover(pfx_new_cover, pfx_covered)) + { + mfib_entry_cover_changed(covered); + } + } + /* continue */ + return (1); +} + +void +mfib_entry_cover_change_notify (fib_node_index_t cover_index, + fib_node_index_t covered) +{ + mfib_entry_t *cover; + + cover = mfib_entry_get(cover_index); + + mfib_entry_cover_walk(cover, + mfib_entry_cover_change_one, + uword_to_pointer(covered, void*)); +} + +static int +mfib_entry_cover_update_one (mfib_entry_t *cover, + fib_node_index_t covered, + void *args) +{ + mfib_entry_cover_updated(covered); + + /* continue */ + return (1); +} + +void +mfib_entry_cover_update_notify (mfib_entry_t *mfib_entry) +{ + mfib_entry_cover_walk(mfib_entry, + mfib_entry_cover_update_one, + NULL); +} |