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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.
+ */
+
+#ifndef __FIB_ENTRY_H__
+#define __FIB_ENTRY_H__
+
+#include <vnet/fib/fib_node.h>
+#include <vnet/fib/fib_entry_delegate.h>
+#include <vnet/adj/adj.h>
+#include <vnet/ip/ip.h>
+#include <vnet/dpo/dpo.h>
+
+/**
+ * The different sources that can create a route.
+ * The sources are defined here the thier relative priority order.
+ * The lower the value the higher the priority
+ */
+typedef enum fib_source_t_ {
+ /**
+ * Marker. Add new values after this one.
+ */
+ FIB_SOURCE_FIRST,
+ /**
+ * Special sources. These are for entries that are added to all
+ * FIBs by default, and should never be over-ridden (hence they
+ * are the highest priority)
+ */
+ FIB_SOURCE_SPECIAL = FIB_SOURCE_FIRST,
+ /**
+ * Classify. A route that links directly to a classify adj
+ */
+ FIB_SOURCE_CLASSIFY,
+ /**
+ * Route added as a result of interface configuration.
+ * this will also come from the API/CLI, but the distinction is
+ * that is from confiiguration on an interface, not a 'ip route' command
+ */
+ FIB_SOURCE_INTERFACE,
+ /**
+ * A high priority source a plugin can use
+ */
+ FIB_SOURCE_PLUGIN_HI,
+ /**
+ * From the control plane API
+ */
+ FIB_SOURCE_API,
+ /**
+ * From the CLI.
+ */
+ FIB_SOURCE_CLI,
+ /**
+ * LISP
+ */
+ FIB_SOURCE_LISP,
+ /**
+ * SRv6
+ */
+ FIB_SOURCE_SR,
+ /**
+ * IPv[46] Mapping
+ */
+ FIB_SOURCE_MAP,
+ /**
+ * SIXRD
+ */
+ FIB_SOURCE_SIXRD,
+ /**
+ * DHCP
+ */
+ FIB_SOURCE_DHCP,
+ /**
+ * Adjacency source.
+ * routes created as a result of ARP/ND entries. This is lower priority
+ * then the API/CLI. This is on purpose. trust me.
+ */
+ FIB_SOURCE_ADJ,
+ /**
+ * MPLS label. The prefix has been assigned a local label. This source
+ * never provides forwarding information, instead it acts as a place-holder
+ * so the association of label to prefix can be maintained
+ */
+ FIB_SOURCE_MPLS,
+ /**
+ * Attached Export source.
+ * routes created as a result of attahced export. routes thus sourced
+ * will be present in the export tables
+ */
+ FIB_SOURCE_AE,
+ /**
+ * Recursive resolution source.
+ * Used to install an entry that is the resolution traget of another.
+ */
+ FIB_SOURCE_RR,
+ /**
+ * uRPF bypass/exemption.
+ * Used to install an entry that is exempt from the loose uRPF check
+ */
+ FIB_SOURCE_URPF_EXEMPT,
+ /**
+ * The default route source.
+ * The default route is always added to the FIB table (like the
+ * special sources) but we need to be able to over-ride it with
+ * 'ip route' sources when provided
+ */
+ FIB_SOURCE_DEFAULT_ROUTE,
+ /**
+ * Marker. add new entries before this one.
+ */
+ FIB_SOURCE_LAST = FIB_SOURCE_DEFAULT_ROUTE,
+} __attribute__ ((packed)) fib_source_t;
+
+STATIC_ASSERT (sizeof(fib_source_t) == 1,
+ "FIB too many sources");
+
+/**
+ * The maximum number of sources
+ */
+#define FIB_SOURCE_MAX (FIB_SOURCE_LAST+1)
+
+#define FIB_SOURCES { \
+ [FIB_SOURCE_SPECIAL] = "special", \
+ [FIB_SOURCE_INTERFACE] = "interface", \
+ [FIB_SOURCE_API] = "API", \
+ [FIB_SOURCE_CLI] = "CLI", \
+ [FIB_SOURCE_ADJ] = "adjacency", \
+ [FIB_SOURCE_MAP] = "MAP", \
+ [FIB_SOURCE_SR] = "SR", \
+ [FIB_SOURCE_SIXRD] = "SixRD", \
+ [FIB_SOURCE_LISP] = "LISP", \
+ [FIB_SOURCE_CLASSIFY] = "classify", \
+ [FIB_SOURCE_DHCP] = "DHCP", \
+ [FIB_SOURCE_RR] = "recursive-resolution", \
+ [FIB_SOURCE_AE] = "attached_export", \
+ [FIB_SOURCE_MPLS] = "mpls", \
+ [FIB_SOURCE_URPF_EXEMPT] = "urpf-exempt", \
+ [FIB_SOURCE_DEFAULT_ROUTE] = "default-route", \
+}
+
+#define FOR_EACH_FIB_SOURCE(_item) \
+ for (_item = FIB_SOURCE_FIRST; _item < FIB_SOURCE_MAX; _item++)
+
+/**
+ * The different sources that can create a route.
+ * The sources are defined here the thier relative priority order.
+ * The lower the value the higher the priority
+ */
+typedef enum fib_entry_attribute_t_ {
+ /**
+ * Marker. Add new values after this one.
+ */
+ FIB_ENTRY_ATTRIBUTE_FIRST,
+ /**
+ * Connected. The prefix is configured on an interface.
+ */
+ FIB_ENTRY_ATTRIBUTE_CONNECTED = FIB_ENTRY_ATTRIBUTE_FIRST,
+ /**
+ * Attached. The prefix is attached to an interface.
+ */
+ FIB_ENTRY_ATTRIBUTE_ATTACHED,
+ /**
+ * The route is an explicit drop.
+ */
+ FIB_ENTRY_ATTRIBUTE_DROP,
+ /**
+ * The route is exclusive. The client creating the route is
+ * providing an exclusive adjacency.
+ */
+ FIB_ENTRY_ATTRIBUTE_EXCLUSIVE,
+ /**
+ * The route is attached cross tables and thus imports covered
+ * prefixes from the other table.
+ */
+ FIB_ENTRY_ATTRIBUTE_IMPORT,
+ /**
+ * The prefix/address is local to this device
+ */
+ FIB_ENTRY_ATTRIBUTE_LOCAL,
+ /**
+ * Marker. add new entries before this one.
+ */
+ FIB_ENTRY_ATTRIBUTE_LAST = FIB_ENTRY_ATTRIBUTE_LOCAL,
+} fib_entry_attribute_t;
+
+/**
+ * The maximum number of sources
+ */
+#define FIB_ENTRY_ATTRIBUTE_MAX (FIB_ENTRY_ATTRIBUTE_LAST+1)
+
+#define FIB_ENTRY_ATTRIBUTES { \
+ [FIB_ENTRY_ATTRIBUTE_CONNECTED] = "connected", \
+ [FIB_ENTRY_ATTRIBUTE_ATTACHED] = "attached", \
+ [FIB_ENTRY_ATTRIBUTE_IMPORT] = "import", \
+ [FIB_ENTRY_ATTRIBUTE_DROP] = "drop", \
+ [FIB_ENTRY_ATTRIBUTE_EXCLUSIVE] = "exclusive", \
+ [FIB_ENTRY_ATTRIBUTE_LOCAL] = "local", \
+}
+
+#define FOR_EACH_FIB_ATTRIBUTE(_item) \
+ for (_item = FIB_ENTRY_ATTRIBUTE_FIRST; \
+ _item < FIB_ENTRY_ATTRIBUTE_MAX; \
+ _item++)
+
+typedef enum fib_entry_flag_t_ {
+ FIB_ENTRY_FLAG_NONE = 0,
+ FIB_ENTRY_FLAG_CONNECTED = (1 << FIB_ENTRY_ATTRIBUTE_CONNECTED),
+ FIB_ENTRY_FLAG_ATTACHED = (1 << FIB_ENTRY_ATTRIBUTE_ATTACHED),
+ FIB_ENTRY_FLAG_DROP = (1 << FIB_ENTRY_ATTRIBUTE_DROP),
+ FIB_ENTRY_FLAG_EXCLUSIVE = (1 << FIB_ENTRY_ATTRIBUTE_EXCLUSIVE),
+ FIB_ENTRY_FLAG_LOCAL = (1 << FIB_ENTRY_ATTRIBUTE_LOCAL),
+ FIB_ENTRY_FLAG_IMPORT = (1 << FIB_ENTRY_ATTRIBUTE_IMPORT),
+} fib_entry_flag_t;
+
+/**
+ * Flags for the source data
+ */
+typedef enum fib_entry_src_attribute_t_ {
+ /**
+ * Marker. Add new values after this one.
+ */
+ FIB_ENTRY_SRC_ATTRIBUTE_FIRST,
+ /**
+ * the source has been added to the entry
+ */
+ FIB_ENTRY_SRC_ATTRIBUTE_ADDED = FIB_ENTRY_SRC_ATTRIBUTE_FIRST,
+ /**
+ * the source is active/best
+ */
+ FIB_ENTRY_SRC_ATTRIBUTE_ACTIVE,
+ /**
+ * Marker. add new entries before this one.
+ */
+ FIB_ENTRY_SRC_ATTRIBUTE_LAST = FIB_ENTRY_SRC_ATTRIBUTE_ACTIVE,
+} fib_entry_src_attribute_t;
+
+#define FIB_ENTRY_SRC_ATTRIBUTE_MAX (FIB_ENTRY_SRC_ATTRIBUTE_LAST+1)
+
+#define FIB_ENTRY_SRC_ATTRIBUTES { \
+ [FIB_ENTRY_SRC_ATTRIBUTE_ADDED] = "added", \
+ [FIB_ENTRY_SRC_ATTRIBUTE_ACTIVE] = "active", \
+}
+
+typedef enum fib_entry_src_flag_t_ {
+ FIB_ENTRY_SRC_FLAG_NONE = 0,
+ FIB_ENTRY_SRC_FLAG_ADDED = (1 << FIB_ENTRY_SRC_ATTRIBUTE_ADDED),
+ FIB_ENTRY_SRC_FLAG_ACTIVE = (1 << FIB_ENTRY_SRC_ATTRIBUTE_ACTIVE),
+} __attribute__ ((packed)) fib_entry_src_flag_t;
+
+/*
+ * Keep the size of the flags field to 2 bytes, so it
+ * can be placed next to the 2 bytes reference count
+ */
+STATIC_ASSERT (sizeof(fib_entry_src_flag_t) <= 2,
+ "FIB entry flags field size too big");
+
+/**
+ * Information related to the source of a FIB entry
+ */
+typedef struct fib_entry_src_t_ {
+ /**
+ * A vector of path extensions
+ */
+ struct fib_path_ext_t_ *fes_path_exts;
+
+ /**
+ * The path-list created by the source
+ */
+ fib_node_index_t fes_pl;
+ /**
+ * Which source this info block is for
+ */
+ fib_source_t fes_src;
+ /**
+ * Flags on the source
+ */
+ fib_entry_src_flag_t fes_flags;
+
+ /**
+ * 1 bytes ref count. This is not the number of users of the Entry
+ * (which is itself not large, due to path-list sharing), but the number
+ * of times a given source has been added. Which is even fewer
+ */
+ u8 fes_ref_count;
+
+ /**
+ * Flags the source contributes to the entry
+ */
+ fib_entry_flag_t fes_entry_flags;
+
+ /**
+ * Source specific info
+ */
+ union {
+ struct {
+ /**
+ * the index of the FIB entry that is the covering entry
+ */
+ fib_node_index_t fesr_cover;
+ /**
+ * This source's index in the cover's list
+ */
+ u32 fesr_sibling;
+ } rr;
+ struct {
+ /**
+ * the index of the FIB entry that is the covering entry
+ */
+ fib_node_index_t fesa_cover;
+ /**
+ * This source's index in the cover's list
+ */
+ u32 fesa_sibling;
+ } adj;
+ struct {
+ /**
+ * the index of the FIB entry that is the covering entry
+ */
+ fib_node_index_t fesi_cover;
+ /**
+ * This source's index in the cover's list
+ */
+ u32 fesi_sibling;
+ } interface;
+ struct {
+ /**
+ * This MPLS local label associated with the prefix.
+ */
+ mpls_label_t fesm_label;
+
+ /**
+ * the indicies of the LFIB entries created
+ */
+ fib_node_index_t fesm_lfes[2];
+ } mpls;
+ struct {
+ /**
+ * The source FIB index.
+ */
+ fib_node_index_t fesl_fib_index;
+ } lisp;
+ };
+} fib_entry_src_t;
+
+/**
+ * An entry in a FIB table.
+ *
+ * This entry represents a route added to the FIB that is stored
+ * in one of the FIB tables.
+ */
+typedef struct fib_entry_t_ {
+ /**
+ * Base class. The entry's node representation in the graph.
+ */
+ fib_node_t fe_node;
+ /**
+ * The prefix of the route. this is const just to be sure.
+ * It is the entry's key/identity and so should never change.
+ */
+ const fib_prefix_t fe_prefix;
+ /**
+ * The index of the FIB table this entry is in
+ */
+ u32 fe_fib_index;
+ /**
+ * The load-balance used for forwarding.
+ *
+ * We don't share the EOS and non-EOS even in case when they could be
+ * because:
+ * - complexity & reliability v. memory
+ * determining the conditions where sharing is possible is non-trivial.
+ * - separate LBs means we can get the EOS bit right in the MPLS label DPO
+ * and so save a few clock cycles in the DP imposition node since we can
+ * paint the header straight on without the need to check the packet
+ * type to derive the EOS bit value.
+ */
+ dpo_id_t fe_lb; // [FIB_FORW_CHAIN_MPLS_NUM];
+ /**
+ * Vector of source infos.
+ * Most entries will only have 1 source. So we optimise for memory usage,
+ * which is preferable since we have many entries.
+ */
+ fib_entry_src_t *fe_srcs;
+ /**
+ * the path-list for which this entry is a child. This is also the path-list
+ * that is contributing forwarding for this entry.
+ */
+ fib_node_index_t fe_parent;
+ /**
+ * index of this entry in the parent's child list.
+ * This is set when this entry is added as a child, but can also
+ * be changed by the parent as it manages its list.
+ */
+ u32 fe_sibling;
+
+ /**
+ * A vector of delegates.
+ */
+ fib_entry_delegate_t *fe_delegates;
+} fib_entry_t;
+
+#define FOR_EACH_FIB_ENTRY_FLAG(_item) \
+ for (_item = FIB_ENTRY_FLAG_FIRST; _item < FIB_ENTRY_FLAG_MAX; _item++)
+
+#define FIB_ENTRY_FORMAT_BRIEF (0x0)
+#define FIB_ENTRY_FORMAT_DETAIL (0x1)
+#define FIB_ENTRY_FORMAT_DETAIL2 (0x2)
+
+extern u8 *format_fib_entry (u8 * s, va_list * args);
+
+extern fib_node_index_t fib_entry_create_special(u32 fib_index,
+ const fib_prefix_t *prefix,
+ fib_source_t source,
+ fib_entry_flag_t flags,
+ const dpo_id_t *dpo);
+
+extern fib_node_index_t fib_entry_create (u32 fib_index,
+ const fib_prefix_t *prefix,
+ fib_source_t source,
+ fib_entry_flag_t flags,
+ const fib_route_path_t *paths);
+extern void fib_entry_update (fib_node_index_t fib_entry_index,
+ fib_source_t source,
+ fib_entry_flag_t flags,
+ const fib_route_path_t *paths);
+
+extern void fib_entry_path_add(fib_node_index_t fib_entry_index,
+ fib_source_t source,
+ fib_entry_flag_t flags,
+ const fib_route_path_t *rpath);
+extern void fib_entry_special_add(fib_node_index_t fib_entry_index,
+ fib_source_t source,
+ fib_entry_flag_t flags,
+ const dpo_id_t *dpo);
+extern void fib_entry_special_update(fib_node_index_t fib_entry_index,
+ fib_source_t source,
+ fib_entry_flag_t flags,
+ const dpo_id_t *dpo);
+extern fib_entry_src_flag_t fib_entry_special_remove(fib_node_index_t fib_entry_index,
+ fib_source_t source);
+
+extern fib_entry_src_flag_t fib_entry_path_remove(fib_node_index_t fib_entry_index,
+ fib_source_t source,
+ const fib_route_path_t *rpath);
+extern fib_entry_src_flag_t fib_entry_delete(fib_node_index_t fib_entry_index,
+ fib_source_t source);
+
+extern void fib_entry_contribute_urpf(fib_node_index_t path_index,
+ index_t urpf);
+extern void fib_entry_contribute_forwarding(
+ fib_node_index_t fib_entry_index,
+ fib_forward_chain_type_t type,
+ dpo_id_t *dpo);
+extern const dpo_id_t * fib_entry_contribute_ip_forwarding(
+ fib_node_index_t fib_entry_index);
+extern adj_index_t fib_entry_get_adj_for_source(
+ fib_node_index_t fib_entry_index,
+ fib_source_t source);
+extern const int fib_entry_get_dpo_for_source (
+ fib_node_index_t fib_entry_index,
+ fib_source_t source,
+ dpo_id_t *dpo);
+
+extern adj_index_t fib_entry_get_adj(fib_node_index_t fib_entry_index);
+
+extern int fib_entry_cmp_for_sort(void *i1, void *i2);
+
+extern void fib_entry_cover_changed(fib_node_index_t fib_entry);
+extern void fib_entry_cover_updated(fib_node_index_t fib_entry);
+extern int fib_entry_recursive_loop_detect(fib_node_index_t entry_index,
+ fib_node_index_t **entry_indicies);
+
+extern void fib_entry_lock(fib_node_index_t fib_entry_index);
+extern void fib_entry_unlock(fib_node_index_t fib_entry_index);
+
+extern u32 fib_entry_child_add(fib_node_index_t fib_entry_index,
+ fib_node_type_t type,
+ fib_node_index_t child_index);
+extern void fib_entry_child_remove(fib_node_index_t fib_entry_index,
+ u32 sibling_index);
+extern u32 fib_entry_get_resolving_interface(fib_node_index_t fib_entry_index);
+extern u32 fib_entry_get_resolving_interface_for_source(
+ fib_node_index_t fib_entry_index,
+ fib_source_t source);
+
+extern void fib_entry_encode(fib_node_index_t fib_entry_index,
+ fib_route_path_encode_t **api_rpaths);
+extern void fib_entry_get_prefix(fib_node_index_t fib_entry_index,
+ fib_prefix_t *pfx);
+extern u32 fib_entry_get_fib_index(fib_node_index_t fib_entry_index);
+extern void fib_entry_set_source_data(fib_node_index_t fib_entry_index,
+ fib_source_t source,
+ const void *data);
+extern const void* fib_entry_get_source_data(fib_node_index_t fib_entry_index,
+ fib_source_t source);
+
+extern fib_entry_flag_t fib_entry_get_flags(fib_node_index_t fib_entry_index);
+extern fib_entry_flag_t fib_entry_get_flags_for_source(
+ fib_node_index_t fib_entry_index,
+ fib_source_t source);
+extern fib_source_t fib_entry_get_best_source(fib_node_index_t fib_entry_index);
+extern int fib_entry_is_sourced(fib_node_index_t fib_entry_index,
+ fib_source_t source);
+
+extern fib_node_index_t fib_entry_get_path_list(fib_node_index_t fib_entry_index);
+
+extern void fib_entry_module_init(void);
+
+/*
+ * unsafe... beware the raw pointer.
+ */
+extern fib_node_index_t fib_entry_get_index(const fib_entry_t * fib_entry);
+extern fib_entry_t * fib_entry_get(fib_node_index_t fib_entry_index);
+
+/*
+ * for testing purposes.
+ */
+extern u32 fib_entry_pool_size(void);
+
+#endif