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-rw-r--r--src/vnet/fib/fib_entry_cover.c180
1 files changed, 180 insertions, 0 deletions
diff --git a/src/vnet/fib/fib_entry_cover.c b/src/vnet/fib/fib_entry_cover.c
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+++ b/src/vnet/fib/fib_entry_cover.c
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+/*
+ * 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>
+
+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_get(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_get(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 paraneters 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 int
+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);
+
+ /* continue */
+ return (1);
+}
+
+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_get(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 int
+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)
+ {
+ fib_prefix_t pfx_covered, pfx_new_cover;
+
+ fib_entry_get_prefix(covered, &pfx_covered);
+ fib_entry_get_prefix(new_cover, &pfx_new_cover);
+
+ if (fib_prefix_is_cover(&pfx_new_cover, &pfx_covered))
+ {
+ fib_entry_cover_changed(covered);
+ }
+ }
+ /* continue */
+ return (1);
+}
+
+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 int
+fib_entry_cover_update_one (fib_entry_t *cover,
+ fib_node_index_t covered,
+ void *args)
+{
+ fib_entry_cover_updated(covered);
+
+ /* continue */
+ return (1);
+}
+
+void
+fib_entry_cover_update_notify (fib_entry_t *fib_entry)
+{
+ fib_entry_cover_walk(fib_entry,
+ fib_entry_cover_update_one,
+ NULL);
+}