MFIB: recurse resolution through an MFIB entry

Change-Id: I8dc261e40b8398c5c8ab6bb69ecebbd0176055d9
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 112 insertions, 0 deletions

diff --git a/src/vnet/mfib/mfib_entry_src_rr.c b/src/vnet/mfib/mfib_entry_src_rr.c
new file mode 100644
index 00000000000..4512f74a9f5
--- /dev/null
+++ b/src/vnet/mfib/mfib_entry_src_rr.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2018 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_src.h>
+#include <vnet/mfib/mfib_entry_cover.h>
+#include <vnet/mfib/mfib_table.h>
+#include <vnet/fib/fib_path_list.h>
+
+static void
+mfib_entry_src_rr_deactiviate (mfib_entry_t *mfib_entry,
+                               mfib_entry_src_t *msrc)
+{
+    mfib_entry_t *cover;
+
+    /*
+     * remove the depednecy on the covering entry
+     */
+    if (FIB_NODE_INDEX_INVALID != msrc->mfes_cover)
+    {
+	cover = mfib_entry_get(msrc->mfes_cover);
+	mfib_entry_cover_untrack(cover, msrc->mfes_sibling);
+	msrc->mfes_cover = FIB_NODE_INDEX_INVALID;
+    }
+
+    fib_path_list_unlock(msrc->mfes_pl);
+    msrc->mfes_pl = FIB_NODE_INDEX_INVALID;
+    msrc->mfes_itfs = NULL;
+    msrc->mfes_exts = NULL;
+}
+
+static void
+mfib_entry_src_rr_activiate (mfib_entry_t *mfib_entry,
+                             mfib_entry_src_t *msrc)
+{
+    mfib_entry_src_t *csrc;
+    mfib_entry_t *cover;
+
+    msrc->mfes_cover = mfib_table_get_less_specific(mfib_entry->mfe_fib_index,
+                                                    &mfib_entry->mfe_prefix);
+
+    ASSERT(FIB_NODE_INDEX_INVALID != msrc->mfes_cover);
+
+    cover = mfib_entry_get(msrc->mfes_cover);
+
+    msrc->mfes_sibling =
+	mfib_entry_cover_track(cover, mfib_entry_get_index(mfib_entry));
+
+    csrc = mfib_entry_get_best_src(cover);
+
+    msrc->mfes_pl = csrc->mfes_pl;
+    fib_path_list_lock(msrc->mfes_pl);
+    msrc->mfes_flags = csrc->mfes_flags;
+    msrc->mfes_itfs = csrc->mfes_itfs;
+    msrc->mfes_exts = csrc->mfes_exts;
+    msrc->mfes_rpf_id = csrc->mfes_rpf_id;
+}
+
+static mfib_src_res_t
+mfib_entry_src_rr_cover_change (mfib_entry_t *mfib_entry,
+                                mfib_entry_src_t *msrc)
+{
+    mfib_entry_src_rr_deactiviate(mfib_entry, msrc);
+    mfib_entry_src_rr_activiate(mfib_entry, msrc);
+
+    return (MFIB_SRC_REEVALUATE);
+}
+
+static mfib_src_res_t
+mfib_entry_src_rr_cover_update (mfib_entry_t *mfib_entry,
+                                mfib_entry_src_t *msrc)
+{
+    /*
+     * path lists are updated (i.e. not shared) in the mfib world,
+     * so there's no need to check for a new one. but we do need to
+     * copy down any new flags and input interfaces
+     */
+    mfib_entry_t *cover;
+
+    cover = mfib_entry_get(msrc->mfes_cover);
+
+    msrc->mfes_flags = cover->mfe_flags;
+    msrc->mfes_itfs = cover->mfe_itfs;
+    msrc->mfes_rpf_id = cover->mfe_rpf_id;
+
+    return (MFIB_SRC_REEVALUATE);
+}
+
+void
+mfib_entry_src_rr_module_init (void)
+{
+    mfib_entry_src_vft mvft = {
+        .mev_activate = mfib_entry_src_rr_activiate,
+        .mev_deactivate = mfib_entry_src_rr_deactiviate,
+        .mev_cover_change = mfib_entry_src_rr_cover_change,
+        .mev_cover_update = mfib_entry_src_rr_cover_update,
+    };
+
+    mfib_entry_src_register(MFIB_SOURCE_RR, &mvft);
+}