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-rw-r--r--src/vnet/adj/adj_midchain_delegate.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/src/vnet/adj/adj_midchain_delegate.c b/src/vnet/adj/adj_midchain_delegate.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/adj/adj_delegate.h>
+#include <vnet/adj/adj_midchain.h>
+#include <vnet/fib/fib_table.h>
+
+/**
+ * Midchain stacker delegate
+ */
+typedef struct adj_midchain_delegate_t_
+{
+ /**
+ * the Fib Entry we are stacked on
+ */
+ fib_node_index_t amd_fei;
+
+ /**
+ * The sibling entry on the FIB entry
+ */
+ u32 amd_sibling;
+} adj_midchain_delegate_t;
+
+/**
+ * Pool of delegates
+ */
+static adj_midchain_delegate_t *amd_pool;
+
+static inline const adj_midchain_delegate_t*
+adj_midchain_from_const_base (const adj_delegate_t *ad)
+{
+ if (NULL != ad)
+ {
+ return (pool_elt_at_index(amd_pool, ad->ad_index));
+ }
+ return (NULL);
+}
+
+static void
+adj_midchain_delegate_restack_i (adj_index_t ai,
+ adj_midchain_delegate_t *amd)
+{
+ if (vnet_sw_interface_is_admin_up (vnet_get_main (),
+ adj_get_sw_if_index(ai)) &&
+ (FIB_NODE_INDEX_INVALID != amd->amd_fei))
+ {
+ const fib_prefix_t *pfx;
+
+ pfx = fib_entry_get_prefix(amd->amd_fei);
+
+ adj_nbr_midchain_stack_on_fib_entry (
+ ai,
+ amd->amd_fei,
+ fib_forw_chain_type_from_fib_proto(pfx->fp_proto));
+ }
+ else
+ {
+ adj_nbr_midchain_unstack (ai);
+ }
+}
+
+void
+adj_midchain_delegate_restack (adj_index_t ai)
+{
+ adj_midchain_delegate_t *amd;
+ ip_adjacency_t *adj;
+ adj_delegate_t *ad;
+
+ /*
+ * if there's a delegate already use that
+ */
+ adj = adj_get(ai);
+ ad = adj_delegate_get(adj, ADJ_DELEGATE_MIDCHAIN);
+
+ if (NULL != ad)
+ {
+ amd = pool_elt_at_index(amd_pool, ad->ad_index);
+
+ adj_midchain_delegate_restack_i(ai, amd);
+ }
+ /*
+ * else
+ * nothing to stack
+ */
+}
+
+void
+adj_midchain_delegate_stack (adj_index_t ai,
+ u32 fib_index,
+ const fib_prefix_t *pfx)
+{
+ adj_midchain_delegate_t *amd;
+ ip_adjacency_t *adj;
+ adj_delegate_t *ad;
+
+ /*
+ * if there's a delegate already use that
+ */
+ adj = adj_get(ai);
+ ad = adj_delegate_get(adj, ADJ_DELEGATE_MIDCHAIN);
+
+ if (NULL != ad)
+ {
+ amd = pool_elt_at_index(amd_pool, ad->ad_index);
+ }
+ else
+ {
+ pool_get(amd_pool, amd);
+ amd->amd_fei = FIB_NODE_INDEX_INVALID;
+ adj_delegate_add(adj, ADJ_DELEGATE_MIDCHAIN, amd - amd_pool);
+
+ amd->amd_fei = fib_table_entry_special_add(fib_index,
+ pfx,
+ FIB_SOURCE_RR,
+ FIB_ENTRY_FLAG_NONE);
+ amd->amd_sibling = fib_entry_child_add(amd->amd_fei,
+ FIB_NODE_TYPE_ADJ,
+ ai);
+ }
+ adj_midchain_delegate_restack_i(ai, amd);
+}
+
+void
+adj_midchain_delegate_unstack (adj_index_t ai)
+{
+ adj_nbr_midchain_unstack(ai);
+}
+
+static void
+adj_midchain_delegate_adj_deleted (adj_delegate_t *ad)
+{
+ adj_midchain_delegate_t *amd;
+
+ amd = pool_elt_at_index(amd_pool, ad->ad_index);
+
+ fib_entry_child_remove (amd->amd_fei, amd->amd_sibling);
+ fib_table_entry_delete_index (amd->amd_fei, FIB_SOURCE_RR);
+
+ pool_put(amd_pool, amd);
+}
+
+/**
+ * Print a delegate that represents MIDCHAIN tracking
+ */
+static u8 *
+adj_midchain_delegate_fmt (const adj_delegate_t *aed, u8 *s)
+{
+ const adj_midchain_delegate_t *amd = adj_midchain_from_const_base(aed);
+
+ s = format(s, "MIDCHAIN:[fib-entry:%d]", amd->amd_fei);
+
+ return (s);
+}
+
+const static adj_delegate_vft_t adj_delegate_vft = {
+ .adv_format = adj_midchain_delegate_fmt,
+ .adv_adj_deleted = adj_midchain_delegate_adj_deleted,
+};
+
+static clib_error_t *
+adj_midchain_delegate_module_init (vlib_main_t * vm)
+{
+ clib_error_t * error = NULL;
+
+ adj_delegate_register_type (ADJ_DELEGATE_MIDCHAIN, &adj_delegate_vft);
+
+ return (error);
+}
+
+VLIB_INIT_FUNCTION (adj_midchain_delegate_module_init);
+