IP6 link-local table

- IPv6 link local table is a per-SW interface array of IPv6 unicast FIBs
- the per-interface ocst is sizeof(fib_table_t) which is small,
  w.r.t. the cost of an interface
- FE80::/10 in the 'global' table points to a DPO that performs a lookup in the
  input interface's LL fib.

Change-Id: Ice834b25ebeeacb2e929d7c864d7ec8c09918cbe
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>

1 files changed, 104 insertions, 0 deletions

diff --git a/src/vnet/ip/ip6_ll_table.h b/src/vnet/ip/ip6_ll_table.h
new file mode 100644
index 00000000000..0667cf99128
--- /dev/null
+++ b/src/vnet/ip/ip6_ll_table.h
@@ -0,0 +1,104 @@
+/*
+ * 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.
+ */
+
+#ifndef __IP6_LL_TABLE_H__
+#define __IP6_LL_TABLE_H__
+
+#include <vnet/ip/ip.h>
+
+#include <vnet/ip/ip6_ll_types.h>
+
+/**
+ * @brief
+ *   A protocol Independent IP multicast FIB table
+ */
+typedef struct ip6_ll_table_t_
+{
+  /**
+   * A vector, indexed by sw_if_index, of unicast IPv6 FIBs
+   */
+  u32 *ilt_fibs;
+
+  /**
+   * Total route counters
+   */
+  u32 ilt_total_route_counts;
+
+} ip6_ll_table_t;
+
+/**
+ * @brief
+ *  Perfom a longest prefix match in the non-forwarding table
+ *
+ * @param prefix
+ *  The prefix to lookup
+ *
+ * @return
+ *  The index of the fib_entry_t for the best match, which may be the default route
+ */
+extern fib_node_index_t ip6_ll_table_lookup (const ip6_ll_prefix_t * prefix);
+
+/**
+ * @brief
+ *  Perfom an exact match in the non-forwarding table
+ *
+ * @param prefix
+ *  The prefix to lookup
+ *
+ * @return
+ *  The index of the fib_entry_t for the exact match, or INVALID
+ *  is there is no match.
+ */
+extern fib_node_index_t ip6_ll_table_lookup_exact_match
+  (const ip6_ll_prefix_t * prefix);
+
+/**
+ * @brief
+ * Update an entry in the table. The falgs determine if the entry is
+ * LOCAL, in which case it's a receive, or not, in which case the entry
+ * will link to an adjacency.
+ *
+ * @param prefix
+ *  The prefix for the entry to add
+ *
+ * @return
+ *  the index of the fib_entry_t that is created (or existed already).
+ */
+extern fib_node_index_t ip6_ll_table_entry_update
+  (const ip6_ll_prefix_t * prefix, fib_route_path_flags_t flags);
+
+/**
+ * @brief
+ *  Delete a IP6 link-local entry.
+ *
+ * @param prefix
+ *  The prefix for the entry to remove
+ */
+extern void ip6_ll_table_entry_delete (const ip6_ll_prefix_t * prefix);
+
+/**
+ * @brief For use in the data plane. Get the underlying ip6 FIB
+ */
+extern u32 ip6_ll_fib_get (u32 sw_if_index);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
+
+#endif