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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Routing Information Base header
+ * Copyright (C) 1997 Kunihiro Ishiguro
+ */
+
+#ifndef _ZEBRA_RIB_H
+#define _ZEBRA_RIB_H
+
+#include "zebra.h"
+#include "memory.h"
+#include "hook.h"
+#include "typesafe.h"
+#include "linklist.h"
+#include "prefix.h"
+#include "table.h"
+#include "queue.h"
+#include "nexthop.h"
+#include "nexthop_group.h"
+#include "vrf.h"
+#include "if.h"
+#include "mpls.h"
+#include "srcdest_table.h"
+#include "zebra/zebra_nhg.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+DECLARE_MGROUP(ZEBRA);
+
+DECLARE_MTYPE(RE);
+
+PREDECL_LIST(rnh_list);
+
+/* Nexthop structure. */
+struct rnh {
+ uint8_t flags;
+
+#define ZEBRA_NHT_CONNECTED 0x1
+#define ZEBRA_NHT_DELETED 0x2
+#define ZEBRA_NHT_RESOLVE_VIA_DEFAULT 0x4
+
+ /* VRF identifier. */
+ vrf_id_t vrf_id;
+
+ afi_t afi;
+ safi_t safi;
+
+ uint32_t seqno;
+
+ struct route_entry *state;
+ struct prefix resolved_route;
+ struct list *client_list;
+
+ /* pseudowires dependent on this nh */
+ struct list *zebra_pseudowire_list;
+
+ struct route_node *node;
+
+ /*
+ * if this has been filtered for the client
+ */
+ int filtered[ZEBRA_ROUTE_MAX];
+
+ struct rnh_list_item rnh_list_item;
+};
+
+#define DISTANCE_INFINITY 255
+#define ZEBRA_KERNEL_TABLE_MAX 252 /* support for no more than this rt tables */
+
+PREDECL_LIST(re_list);
+
+struct re_opaque {
+ uint16_t length;
+ uint8_t data[];
+};
+
+struct route_entry {
+ /* Link list. */
+ struct re_list_item next;
+
+ /* Nexthop group, shared/refcounted, based on the nexthop(s)
+ * provided by the owner of the route
+ */
+ struct nhg_hash_entry *nhe;
+
+ /* Nexthop group from FIB (optional), reflecting what is actually
+ * installed in the FIB if that differs. The 'backup' group is used
+ * when backup nexthops are present in the route's nhg.
+ */
+ struct nexthop_group fib_ng;
+ struct nexthop_group fib_backup_ng;
+
+ /* Nexthop group hash entry IDs. The "installed" id is the id
+ * used in linux/netlink, if available.
+ */
+ uint32_t nhe_id;
+ uint32_t nhe_installed_id;
+
+ /* Tag */
+ route_tag_t tag;
+
+ /* Uptime. */
+ time_t uptime;
+
+ /* Type of this route. */
+ int type;
+
+ /* VRF identifier. */
+ vrf_id_t vrf_id;
+
+ /* Which routing table */
+ uint32_t table;
+
+ /* Metric */
+ uint32_t metric;
+
+ /* MTU */
+ uint32_t mtu;
+ uint32_t nexthop_mtu;
+
+ /* Flags of this route.
+ * This flag's definition is in lib/zebra.h ZEBRA_FLAG_* and is exposed
+ * to clients via Zserv
+ */
+ uint32_t flags;
+
+ /* RIB internal status */
+ uint32_t status;
+#define ROUTE_ENTRY_REMOVED 0x1
+/* The Route Entry has changed */
+#define ROUTE_ENTRY_CHANGED 0x2
+/* The Label has changed on the Route entry */
+#define ROUTE_ENTRY_LABELS_CHANGED 0x4
+/* Route is queued for Installation into the Data Plane */
+#define ROUTE_ENTRY_QUEUED 0x8
+/* Route is installed into the Data Plane */
+#define ROUTE_ENTRY_INSTALLED 0x10
+/* Route has Failed installation into the Data Plane in some manner */
+#define ROUTE_ENTRY_FAILED 0x20
+/* Route has a 'fib' set of nexthops, probably because the installed set
+ * differs from the rib/normal set of nexthops.
+ */
+#define ROUTE_ENTRY_USE_FIB_NHG 0x40
+/*
+ * Route entries that are going to the dplane for a Route Replace
+ * let's note the fact that this is happening. This will
+ * be useful when zebra is determing if a route can be
+ * used for nexthops
+ */
+#define ROUTE_ENTRY_ROUTE_REPLACING 0x80
+
+ /* Sequence value incremented for each dataplane operation */
+ uint32_t dplane_sequence;
+
+ /* Source protocol instance */
+ uint16_t instance;
+
+ /* Distance. */
+ uint8_t distance;
+
+ struct re_opaque *opaque;
+};
+
+#define RIB_SYSTEM_ROUTE(R) RSYSTEM_ROUTE((R)->type)
+
+#define RIB_KERNEL_ROUTE(R) RKERNEL_ROUTE((R)->type)
+
+/* Define route types that are equivalent to "connected". */
+#define RIB_CONNECTED_ROUTE(R) \
+ ((R)->type == ZEBRA_ROUTE_CONNECT || (R)->type == ZEBRA_ROUTE_NHRP)
+
+/* meta-queue structure:
+ * sub-queue 0: nexthop group objects
+ * sub-queue 1: EVPN/VxLAN objects
+ * sub-queue 2: Early Route Processing
+ * sub-queue 3: Early Label Processing
+ * sub-queue 4: connected
+ * sub-queue 5: kernel
+ * sub-queue 6: static
+ * sub-queue 7: RIP, RIPng, OSPF, OSPF6, IS-IS, EIGRP, NHRP
+ * sub-queue 8: iBGP, eBGP
+ * sub-queue 9: any other origin (if any) typically those that
+ * don't generate routes
+ */
+#define MQ_SIZE 11
+
+/* For checking that an object has already queued in some sub-queue */
+#define MQ_BIT_MASK ((1 << MQ_SIZE) - 1)
+
+struct meta_queue {
+ struct list *subq[MQ_SIZE];
+ uint32_t size; /* sum of lengths of all subqueues */
+};
+
+/*
+ * Structure that represents a single destination (prefix).
+ */
+typedef struct rib_dest_t_ {
+
+ /*
+ * Back pointer to the route node for this destination. This helps
+ * us get to the prefix that this structure is for.
+ */
+ struct route_node *rnode;
+
+ /*
+ * Doubly-linked list of routes for this prefix.
+ */
+ struct re_list_head routes;
+
+ struct route_entry *selected_fib;
+
+ /*
+ * Flags, see below.
+ */
+ uint32_t flags;
+
+ /*
+ * The list of nht prefixes that have ended up
+ * depending on this route node.
+ * After route processing is returned from
+ * the data plane we will run evaluate_rnh
+ * on these prefixes.
+ */
+ struct rnh_list_head nht;
+
+ /*
+ * Linkage to put dest on the FPM processing queue.
+ */
+ TAILQ_ENTRY(rib_dest_t_) fpm_q_entries;
+
+} rib_dest_t;
+
+DECLARE_LIST(rnh_list, struct rnh, rnh_list_item);
+DECLARE_LIST(re_list, struct route_entry, next);
+
+#define RIB_ROUTE_QUEUED(x) (1 << (x))
+// If MQ_SIZE is modified this value needs to be updated.
+#define RIB_ROUTE_ANY_QUEUED 0x3F
+
+/*
+ * The maximum qindex that can be used.
+ */
+#define ZEBRA_MAX_QINDEX (MQ_SIZE - 1)
+
+/*
+ * This flag indicates that a given prefix has been 'advertised' to
+ * the FPM to be installed in the forwarding plane.
+ */
+#define RIB_DEST_SENT_TO_FPM (1 << (ZEBRA_MAX_QINDEX + 1))
+
+/*
+ * This flag is set when we need to send an update to the FPM about a
+ * dest.
+ */
+#define RIB_DEST_UPDATE_FPM (1 << (ZEBRA_MAX_QINDEX + 2))
+
+#define RIB_DEST_UPDATE_LSPS (1 << (ZEBRA_MAX_QINDEX + 3))
+
+/*
+ * Macro to iterate over each route for a destination (prefix).
+ */
+#define RE_DEST_FOREACH_ROUTE(dest, re) \
+ for ((re) = (dest) ? re_list_first(&((dest)->routes)) : NULL; (re); \
+ (re) = re_list_next(&((dest)->routes), (re)))
+
+/*
+ * Same as above, but allows the current node to be unlinked.
+ */
+#define RE_DEST_FOREACH_ROUTE_SAFE(dest, re, next) \
+ for ((re) = (dest) ? re_list_first(&((dest)->routes)) : NULL; \
+ (re) && ((next) = re_list_next(&((dest)->routes), (re)), 1); \
+ (re) = (next))
+
+#define RE_DEST_FIRST_ROUTE(dest, re) \
+ ((re) = (dest) ? re_list_first(&((dest)->routes)) : NULL)
+
+#define RE_DEST_NEXT_ROUTE(dest, re) \
+ ((re) = (dest) ? re_list_next(&((dest)->routes), (re)) : NULL)
+
+#define RNODE_FOREACH_RE(rn, re) \
+ RE_DEST_FOREACH_ROUTE (rib_dest_from_rnode(rn), re)
+
+#define RNODE_FOREACH_RE_SAFE(rn, re, next) \
+ RE_DEST_FOREACH_ROUTE_SAFE (rib_dest_from_rnode(rn), re, next)
+
+#define RNODE_FIRST_RE(rn, re) RE_DEST_FIRST_ROUTE(rib_dest_from_rnode(rn), re)
+
+#define RNODE_NEXT_RE(rn, re) RE_DEST_NEXT_ROUTE(rib_dest_from_rnode(rn), re)
+
+/*
+ * rib_table_info_t
+ *
+ * Structure that is hung off of a route_table that holds information about
+ * the table.
+ */
+struct rib_table_info {
+
+ /*
+ * Back pointer to zebra_vrf.
+ */
+ struct zebra_vrf *zvrf;
+ afi_t afi;
+ safi_t safi;
+ uint32_t table_id;
+};
+
+enum rib_tables_iter_state {
+ RIB_TABLES_ITER_S_INIT,
+ RIB_TABLES_ITER_S_ITERATING,
+ RIB_TABLES_ITER_S_DONE
+};
+
+/*
+ * Structure that holds state for iterating over all tables in the
+ * Routing Information Base.
+ */
+typedef struct rib_tables_iter_t_ {
+ vrf_id_t vrf_id;
+ int afi_safi_ix;
+
+ enum rib_tables_iter_state state;
+} rib_tables_iter_t;
+
+/* Events/reasons triggering a RIB update. */
+enum rib_update_event {
+ RIB_UPDATE_KERNEL,
+ RIB_UPDATE_RMAP_CHANGE,
+ RIB_UPDATE_OTHER,
+ RIB_UPDATE_MAX
+};
+void rib_update_finish(void);
+
+int route_entry_update_nhe(struct route_entry *re,
+ struct nhg_hash_entry *new_nhghe);
+
+/* NHG replace has happend, we have to update route_entry pointers to new one */
+int rib_handle_nhg_replace(struct nhg_hash_entry *old_entry,
+ struct nhg_hash_entry *new_entry);
+
+#define route_entry_dump(prefix, src, re) _route_entry_dump(__func__, prefix, src, re)
+extern void _route_entry_dump(const char *func, union prefixconstptr pp,
+ union prefixconstptr src_pp,
+ const struct route_entry *re);
+
+struct route_entry *
+zebra_rib_route_entry_new(vrf_id_t vrf_id, int type, uint8_t instance,
+ uint32_t flags, uint32_t nhe_id, uint32_t table_id,
+ uint32_t metric, uint32_t mtu, uint8_t distance,
+ route_tag_t tag);
+
+#define ZEBRA_RIB_LOOKUP_ERROR -1
+#define ZEBRA_RIB_FOUND_EXACT 0
+#define ZEBRA_RIB_FOUND_NOGATE 1
+#define ZEBRA_RIB_FOUND_CONNECTED 2
+#define ZEBRA_RIB_NOTFOUND 3
+
+extern int is_zebra_valid_kernel_table(uint32_t table_id);
+extern int is_zebra_main_routing_table(uint32_t table_id);
+extern int zebra_check_addr(const struct prefix *p);
+
+extern void rib_delnode(struct route_node *rn, struct route_entry *re);
+extern void rib_install_kernel(struct route_node *rn, struct route_entry *re,
+ struct route_entry *old);
+extern void rib_uninstall_kernel(struct route_node *rn, struct route_entry *re);
+
+/* NOTE:
+ * All rib_add function will not just add prefix into RIB, but
+ * also implicitly withdraw equal prefix of same type. */
+extern int rib_add(afi_t afi, safi_t safi, vrf_id_t vrf_id, int type,
+ unsigned short instance, uint32_t flags, struct prefix *p,
+ struct prefix_ipv6 *src_p, const struct nexthop *nh,
+ uint32_t nhe_id, uint32_t table_id, uint32_t metric,
+ uint32_t mtu, uint8_t distance, route_tag_t tag,
+ bool startup);
+/*
+ * Multipath route apis.
+ */
+extern int rib_add_multipath(afi_t afi, safi_t safi, struct prefix *p,
+ struct prefix_ipv6 *src_p, struct route_entry *re,
+ struct nexthop_group *ng, bool startup);
+/*
+ * -1 -> some sort of error
+ * 0 -> an add
+ * 1 -> an update
+ */
+extern int rib_add_multipath_nhe(afi_t afi, safi_t safi, struct prefix *p,
+ struct prefix_ipv6 *src_p,
+ struct route_entry *re,
+ struct nhg_hash_entry *nhe, bool startup);
+
+extern void rib_delete(afi_t afi, safi_t safi, vrf_id_t vrf_id, int type,
+ unsigned short instance, uint32_t flags,
+ struct prefix *p, struct prefix_ipv6 *src_p,
+ const struct nexthop *nh, uint32_t nhe_id,
+ uint32_t table_id, uint32_t metric, uint8_t distance,
+ bool fromkernel);
+
+extern struct route_entry *rib_match(afi_t afi, safi_t safi, vrf_id_t vrf_id,
+ const union g_addr *addr,
+ struct route_node **rn_out);
+extern struct route_entry *rib_match_multicast(afi_t afi, vrf_id_t vrf_id,
+ union g_addr *gaddr,
+ struct route_node **rn_out);
+
+extern struct route_entry *rib_lookup_ipv4(struct prefix_ipv4 *p,
+ vrf_id_t vrf_id);
+
+extern void rib_update(enum rib_update_event event);
+extern void rib_update_table(struct route_table *table,
+ enum rib_update_event event, int rtype);
+extern void rib_sweep_route(struct event *t);
+extern void rib_sweep_table(struct route_table *table);
+extern void rib_close_table(struct route_table *table);
+extern void rib_init(void);
+extern unsigned long rib_score_proto(uint8_t proto, unsigned short instance);
+extern unsigned long rib_score_proto_table(uint8_t proto,
+ unsigned short instance,
+ struct route_table *table);
+
+extern int rib_queue_add(struct route_node *rn);
+
+struct nhg_ctx; /* Forward declaration */
+
+/* Enqueue incoming nhg from OS for processing */
+extern int rib_queue_nhg_ctx_add(struct nhg_ctx *ctx);
+
+/* Enqueue incoming nhg from proto daemon for processing */
+extern int rib_queue_nhe_add(struct nhg_hash_entry *nhe);
+
+/* Enqueue evpn route for processing */
+int zebra_rib_queue_evpn_route_add(vrf_id_t vrf_id, const struct ethaddr *rmac,
+ const struct ipaddr *vtep_ip,
+ const struct prefix *host_prefix);
+int zebra_rib_queue_evpn_route_del(vrf_id_t vrf_id,
+ const struct ipaddr *vtep_ip,
+ const struct prefix *host_prefix);
+/* Enqueue EVPN remote ES for processing */
+int zebra_rib_queue_evpn_rem_es_add(const esi_t *esi,
+ const struct in_addr *vtep_ip,
+ bool esr_rxed, uint8_t df_alg,
+ uint16_t df_pref);
+int zebra_rib_queue_evpn_rem_es_del(const esi_t *esi,
+ const struct in_addr *vtep_ip);
+/* Enqueue EVPN remote macip update for processing */
+int zebra_rib_queue_evpn_rem_macip_del(vni_t vni, const struct ethaddr *macaddr,
+ const struct ipaddr *ip,
+ struct in_addr vtep_ip);
+int zebra_rib_queue_evpn_rem_macip_add(vni_t vni, const struct ethaddr *macaddr,
+ const struct ipaddr *ipaddr,
+ uint8_t flags, uint32_t seq,
+ struct in_addr vtep_ip,
+ const esi_t *esi);
+/* Enqueue VXLAN remote vtep update for processing */
+int zebra_rib_queue_evpn_rem_vtep_add(vrf_id_t vrf_id, vni_t vni,
+ struct in_addr vtep_ip,
+ int flood_control);
+int zebra_rib_queue_evpn_rem_vtep_del(vrf_id_t vrf_id, vni_t vni,
+ struct in_addr vtep_ip);
+
+extern void meta_queue_free(struct meta_queue *mq, struct zebra_vrf *zvrf);
+extern int zebra_rib_labeled_unicast(struct route_entry *re);
+extern struct route_table *rib_table_ipv6;
+
+extern void rib_unlink(struct route_node *rn, struct route_entry *re);
+extern int rib_gc_dest(struct route_node *rn);
+extern struct route_table *rib_tables_iter_next(rib_tables_iter_t *iter);
+
+extern uint8_t route_distance(int type);
+
+extern void zebra_rib_evaluate_rn_nexthops(struct route_node *rn, uint32_t seq,
+ bool rt_delete);
+
+/*
+ * rib_find_rn_from_ctx
+ *
+ * Returns a lock increased route_node for the appropriate
+ * table and prefix specified by the context. Developer
+ * should unlock the node when done.
+ */
+extern struct route_node *
+rib_find_rn_from_ctx(const struct zebra_dplane_ctx *ctx);
+
+/*
+ * Inline functions.
+ */
+
+/*
+ * rib_table_info
+ */
+static inline struct rib_table_info *rib_table_info(struct route_table *table)
+{
+ return (struct rib_table_info *)route_table_get_info(table);
+}
+
+/*
+ * rib_dest_from_rnode
+ */
+static inline rib_dest_t *rib_dest_from_rnode(struct route_node *rn)
+{
+ return (rib_dest_t *)rn->info;
+}
+
+/*
+ * rnode_to_ribs
+ *
+ * Returns a pointer to the list of routes corresponding to the given
+ * route_node.
+ */
+static inline struct route_entry *rnode_to_ribs(struct route_node *rn)
+{
+ rib_dest_t *dest;
+
+ dest = rib_dest_from_rnode(rn);
+ if (!dest)
+ return NULL;
+
+ return re_list_first(&dest->routes);
+}
+
+/*
+ * rib_dest_prefix
+ */
+static inline struct prefix *rib_dest_prefix(rib_dest_t *dest)
+{
+ return &dest->rnode->p;
+}
+
+/*
+ * rib_dest_af
+ *
+ * Returns the address family that the destination is for.
+ */
+static inline uint8_t rib_dest_af(rib_dest_t *dest)
+{
+ return dest->rnode->p.family;
+}
+
+/*
+ * rib_dest_table
+ */
+static inline struct route_table *rib_dest_table(rib_dest_t *dest)
+{
+ return srcdest_rnode_table(dest->rnode);
+}
+
+/*
+ * rib_dest_vrf
+ */
+static inline struct zebra_vrf *rib_dest_vrf(rib_dest_t *dest)
+{
+ return rib_table_info(rib_dest_table(dest))->zvrf;
+}
+
+/*
+ * Create the rib_dest_t and attach it to the specified node
+ */
+extern rib_dest_t *zebra_rib_create_dest(struct route_node *rn);
+
+/*
+ * rib_tables_iter_init
+ */
+static inline void rib_tables_iter_init(rib_tables_iter_t *iter)
+
+{
+ memset(iter, 0, sizeof(*iter));
+ iter->state = RIB_TABLES_ITER_S_INIT;
+}
+
+/*
+ * rib_tables_iter_started
+ *
+ * Returns true if this iterator has started iterating over the set of
+ * tables.
+ */
+static inline int rib_tables_iter_started(rib_tables_iter_t *iter)
+{
+ return iter->state != RIB_TABLES_ITER_S_INIT;
+}
+
+/*
+ * rib_tables_iter_cleanup
+ */
+static inline void rib_tables_iter_cleanup(rib_tables_iter_t *iter)
+{
+ iter->state = RIB_TABLES_ITER_S_DONE;
+}
+
+DECLARE_HOOK(rib_update, (struct route_node * rn, const char *reason),
+ (rn, reason));
+DECLARE_HOOK(rib_shutdown, (struct route_node * rn), (rn));
+
+/*
+ * Access installed/fib nexthops, which may be a subset of the
+ * rib nexthops.
+ */
+static inline struct nexthop_group *rib_get_fib_nhg(struct route_entry *re)
+{
+ /* If the fib set is a subset of the active rib set,
+ * use the dedicated fib list.
+ */
+ if (CHECK_FLAG(re->status, ROUTE_ENTRY_USE_FIB_NHG))
+ return &(re->fib_ng);
+ else
+ return &(re->nhe->nhg);
+}
+
+/*
+ * Access backup nexthop-group that represents the installed backup nexthops;
+ * any installed backup will be on the fib list.
+ */
+static inline struct nexthop_group *rib_get_fib_backup_nhg(
+ struct route_entry *re)
+{
+ return &(re->fib_backup_ng);
+}
+
+extern void zebra_gr_process_client(afi_t afi, vrf_id_t vrf_id, uint8_t proto,
+ uint8_t instance);
+
+extern int rib_add_gr_run(afi_t afi, vrf_id_t vrf_id, uint8_t proto,
+ uint8_t instance);
+
+extern void zebra_vty_init(void);
+
+extern pid_t pid;
+
+extern bool v6_rr_semantics;
+
+extern uint32_t rt_table_main_id;
+
+/* Name of hook calls */
+#define ZEBRA_ON_RIB_PROCESS_HOOK_CALL "on_rib_process_dplane_results"
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*_ZEBRA_RIB_H */