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-rw-r--r--src/vnet/fib/fib_entry_src_interface.c195
1 files changed, 195 insertions, 0 deletions
diff --git a/src/vnet/fib/fib_entry_src_interface.c b/src/vnet/fib/fib_entry_src_interface.c
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+++ b/src/vnet/fib/fib_entry_src_interface.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 "fib_entry.h"
+#include "fib_entry_src.h"
+#include "fib_path_list.h"
+#include "fib_internal.h"
+#include "fib_table.h"
+#include "fib_entry_cover.h"
+#include "fib_attached_export.h"
+
+/**
+ * Source initialisation Function
+ */
+static void
+fib_entry_src_interface_init (fib_entry_src_t *src)
+{
+ src->interface.fesi_cover = FIB_NODE_INDEX_INVALID;
+ src->interface.fesi_sibling = FIB_NODE_INDEX_INVALID;
+}
+
+static void
+fib_entry_src_interface_path_swap (fib_entry_src_t *src,
+ const fib_entry_t *entry,
+ fib_path_list_flags_t pl_flags,
+ const fib_route_path_t *paths)
+{
+ ip_adjacency_t *adj;
+
+ src->fes_pl = fib_path_list_create(pl_flags, paths);
+
+ /*
+ * this is a hack to get the entry's prefix into the glean adjacnecy
+ * so that it is available for fast retreival in the switch path.
+ */
+ if (!(FIB_ENTRY_FLAG_LOCAL & src->fes_entry_flags))
+ {
+ adj = adj_get(fib_path_list_get_adj(
+ src->fes_pl,
+ fib_entry_get_default_chain_type(entry)));
+
+ if (IP_LOOKUP_NEXT_GLEAN == adj->lookup_next_index)
+ {
+ /*
+ * the connected prefix will link to a glean on a non-p2p
+ * interface.
+ */
+ adj->sub_type.glean.receive_addr = entry->fe_prefix.fp_addr;
+ }
+ }
+}
+
+/*
+ * Source activate.
+ * Called when the source is teh new longer best source on the entry
+ */
+static int
+fib_entry_src_interface_activate (fib_entry_src_t *src,
+ const fib_entry_t *fib_entry)
+{
+ fib_entry_t *cover;
+
+ if (FIB_ENTRY_FLAG_LOCAL & src->fes_entry_flags)
+ {
+ /*
+ * Track the covering attached/connected cover. This is so that
+ * during an attached export of the cover, this local prefix is
+ * also exported
+ */
+ src->interface.fesi_cover =
+ fib_table_get_less_specific(fib_entry->fe_fib_index,
+ &fib_entry->fe_prefix);
+
+ ASSERT(FIB_NODE_INDEX_INVALID != src->interface.fesi_cover);
+
+ cover = fib_entry_get(src->interface.fesi_cover);
+
+ src->interface.fesi_sibling =
+ fib_entry_cover_track(cover, fib_entry_get_index(fib_entry));
+ }
+
+ return (!0);
+}
+
+
+/*
+ * Source Deactivate.
+ * Called when the source is no longer best source on the entry
+ */
+static void
+fib_entry_src_interface_deactivate (fib_entry_src_t *src,
+ const fib_entry_t *fib_entry)
+{
+ fib_entry_t *cover;
+
+ /*
+ * remove the depednecy on the covering entry
+ */
+ if (FIB_NODE_INDEX_INVALID != src->interface.fesi_cover)
+ {
+ cover = fib_entry_get(src->interface.fesi_cover);
+
+ fib_entry_cover_untrack(cover, src->interface.fesi_sibling);
+
+ src->interface.fesi_cover = FIB_NODE_INDEX_INVALID;
+ }
+}
+
+static fib_entry_src_cover_res_t
+fib_entry_src_interface_cover_change (fib_entry_src_t *src,
+ const fib_entry_t *fib_entry)
+{
+ fib_entry_src_cover_res_t res = {
+ .install = !0,
+ .bw_reason = FIB_NODE_BW_REASON_FLAG_NONE,
+ };
+
+ if (FIB_NODE_INDEX_INVALID == src->interface.fesi_cover)
+ {
+ /*
+ * not tracking the cover. surprised we got poked?
+ */
+ return (res);
+ }
+
+ /*
+ * this function is called when this entry's cover has a more specific
+ * entry inserted benaeth it. That does not necessarily mean that this
+ * entry is covered by the new prefix. check that
+ */
+ if (src->rr.fesr_cover != fib_table_get_less_specific(fib_entry->fe_fib_index,
+ &fib_entry->fe_prefix))
+ {
+ fib_entry_src_interface_deactivate(src, fib_entry);
+ fib_entry_src_interface_activate(src, fib_entry);
+ }
+ return (res);
+}
+
+static void
+fib_entry_src_interface_installed (fib_entry_src_t *src,
+ const fib_entry_t *fib_entry)
+{
+ /*
+ * The interface source now rules! poke our cover to get exported
+ */
+ fib_entry_t *cover;
+
+ if (FIB_NODE_INDEX_INVALID != src->interface.fesi_cover)
+ {
+ cover = fib_entry_get(src->interface.fesi_cover);
+
+ fib_attached_export_covered_added(cover,
+ fib_entry_get_index(fib_entry));
+ }
+}
+
+static u8*
+fib_entry_src_interface_format (fib_entry_src_t *src,
+ u8* s)
+{
+ return (format(s, "cover:%d", src->interface.fesi_cover));
+}
+
+const static fib_entry_src_vft_t interface_src_vft = {
+ .fesv_init = fib_entry_src_interface_init,
+ .fesv_path_swap = fib_entry_src_interface_path_swap,
+ .fesv_activate = fib_entry_src_interface_activate,
+ .fesv_deactivate = fib_entry_src_interface_deactivate,
+ .fesv_format = fib_entry_src_interface_format,
+ .fesv_installed = fib_entry_src_interface_installed,
+ .fesv_cover_change = fib_entry_src_interface_cover_change,
+ /*
+ * not concerned about updates to the cover. the cover will
+ * decide to export or not
+ */
+};
+
+void
+fib_entry_src_interface_register (void)
+{
+ fib_entry_src_register(FIB_SOURCE_INTERFACE, &interface_src_vft);
+}