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-rw-r--r--src/vnet/fib/fib_entry_src_adj.c207
1 files changed, 207 insertions, 0 deletions
diff --git a/src/vnet/fib/fib_entry_src_adj.c b/src/vnet/fib/fib_entry_src_adj.c
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+++ b/src/vnet/fib/fib_entry_src_adj.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_table.h"
+#include "fib_entry_cover.h"
+#include "fib_attached_export.h"
+
+/**
+ * Source initialisation Function
+ */
+static void
+fib_entry_src_adj_init (fib_entry_src_t *src)
+{
+ src->adj.fesa_cover = FIB_NODE_INDEX_INVALID;
+ src->adj.fesa_sibling = FIB_NODE_INDEX_INVALID;
+}
+
+static void
+fib_entry_src_adj_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)
+{
+ src->fes_pl = fib_path_list_create(pl_flags, paths);
+}
+
+static void
+fib_entry_src_adj_remove (fib_entry_src_t *src)
+{
+ src->fes_pl = FIB_NODE_INDEX_INVALID;
+}
+
+
+/*
+ * Source activate.
+ * Called when the source is teh new longer best source on the entry
+ */
+static int
+fib_entry_src_adj_activate (fib_entry_src_t *src,
+ const fib_entry_t *fib_entry)
+{
+ fib_entry_t *cover;
+
+ /*
+ * find the covering prefix. become a dependent thereof.
+ * there should always be a cover, though it may be the default route.
+ */
+ src->adj.fesa_cover = fib_table_get_less_specific(fib_entry->fe_fib_index,
+ &fib_entry->fe_prefix);
+
+ ASSERT(FIB_NODE_INDEX_INVALID != src->adj.fesa_cover);
+ ASSERT(fib_entry_get_index(fib_entry) != src->adj.fesa_cover);
+
+ cover = fib_entry_get(src->adj.fesa_cover);
+
+ ASSERT(cover != fib_entry);
+
+ src->adj.fesa_sibling =
+ fib_entry_cover_track(cover,
+ fib_entry_get_index(fib_entry));
+
+ /*
+ * if the ocver is attached then this adj source entry can install,
+ * via the adj. otherwise install a drop.
+ * This prevents ARP/ND entries that on interface X that do not belong
+ * on X's subnet from being added to the FIB. To do so would allow
+ * nefarious gratuitous ARP requests from attracting traffic to the sender.
+ *
+ * and yes, I really do mean attached and not connected.
+ * this abomination;
+ * ip route add 10.0.0.0/24 Eth0
+ * is attached. and we want adj-fibs to install on Eth0.
+ */
+ return (FIB_ENTRY_FLAG_ATTACHED & fib_entry_get_flags_i(cover));
+}
+
+/*
+ * Source Deactivate.
+ * Called when the source is no longer best source on the entry
+ */
+static void
+fib_entry_src_adj_deactivate (fib_entry_src_t *src,
+ const fib_entry_t *fib_entry)
+{
+ fib_entry_t *cover;
+
+ /*
+ * remove the depednecy on the covering entry
+ */
+ ASSERT(FIB_NODE_INDEX_INVALID != src->adj.fesa_cover);
+ cover = fib_entry_get(src->adj.fesa_cover);
+
+ fib_entry_cover_untrack(cover, src->adj.fesa_sibling);
+
+ /*
+ * tell the cover this entry no longer needs exporting
+ */
+ fib_attached_export_covered_removed(cover, fib_entry_get_index(fib_entry));
+
+ src->adj.fesa_cover = FIB_NODE_INDEX_INVALID;
+}
+
+static u8*
+fib_entry_src_adj_format (fib_entry_src_t *src,
+ u8* s)
+{
+ return (format(s, "cover:%d", src->adj.fesa_cover));
+}
+
+static void
+fib_entry_src_adj_installed (fib_entry_src_t *src,
+ const fib_entry_t *fib_entry)
+{
+ /*
+ * The adj source now rules! poke our cover to get exported
+ */
+ fib_entry_t *cover;
+
+ ASSERT(FIB_NODE_INDEX_INVALID != src->adj.fesa_cover);
+ cover = fib_entry_get(src->adj.fesa_cover);
+
+ fib_attached_export_covered_added(cover,
+ fib_entry_get_index(fib_entry));
+}
+
+static fib_entry_src_cover_res_t
+fib_entry_src_adj_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,
+ };
+
+ fib_entry_src_adj_deactivate(src, fib_entry);
+
+ res.install = fib_entry_src_adj_activate(src, fib_entry);
+
+ if (res.install) {
+ /*
+ * ADJ fib can install
+ */
+ res.bw_reason = FIB_NODE_BW_REASON_FLAG_EVALUATE;
+ }
+
+ return (res);
+}
+
+/*
+ * fib_entry_src_adj_cover_update
+ */
+static fib_entry_src_cover_res_t
+fib_entry_src_adj_cover_update (fib_entry_src_t *src,
+ const fib_entry_t *fib_entry)
+{
+ /*
+ * the cover has updated, i.e. its forwarding or flags
+ * have changed. do'nt decativate/activate here, since this
+ * prefix is updated during the covers walk.
+ */
+ fib_entry_src_cover_res_t res = {
+ .install = !0,
+ .bw_reason = FIB_NODE_BW_REASON_FLAG_NONE,
+ };
+ fib_entry_t *cover;
+
+ ASSERT(FIB_NODE_INDEX_INVALID != src->adj.fesa_cover);
+
+ cover = fib_entry_get(src->adj.fesa_cover);
+
+ res.install = (FIB_ENTRY_FLAG_ATTACHED & fib_entry_get_flags_i(cover));
+
+ return (res);
+}
+
+const static fib_entry_src_vft_t adj_src_vft = {
+ .fesv_init = fib_entry_src_adj_init,
+ .fesv_path_swap = fib_entry_src_adj_path_swap,
+ .fesv_remove = fib_entry_src_adj_remove,
+ .fesv_activate = fib_entry_src_adj_activate,
+ .fesv_deactivate = fib_entry_src_adj_deactivate,
+ .fesv_format = fib_entry_src_adj_format,
+ .fesv_installed = fib_entry_src_adj_installed,
+ .fesv_cover_change = fib_entry_src_adj_cover_change,
+ .fesv_cover_update = fib_entry_src_adj_cover_update,
+};
+
+void
+fib_entry_src_adj_register (void)
+{
+ fib_entry_src_register(FIB_SOURCE_ADJ, &adj_src_vft);
+}