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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Zebra API server.
+ * Portions:
+ * Copyright (C) 1997-1999 Kunihiro Ishiguro
+ * Copyright (C) 2015-2018 Cumulus Networks, Inc.
+ * et al.
+ */
+
+#ifndef _ZEBRA_ZSERV_H
+#define _ZEBRA_ZSERV_H
+
+/* clang-format off */
+#include <stdint.h> /* for uint32_t, uint8_t */
+#include <time.h> /* for time_t */
+
+#include "lib/route_types.h" /* for ZEBRA_ROUTE_MAX */
+#include "lib/zebra.h" /* for AFI_MAX */
+#include "lib/vrf.h" /* for vrf_bitmap_t */
+#include "lib/zclient.h" /* for redist_proto */
+#include "lib/stream.h" /* for stream, stream_fifo */
+#include "frrevent.h" /* for thread, thread_master */
+#include "lib/linklist.h" /* for list */
+#include "lib/workqueue.h" /* for work_queue */
+#include "lib/hook.h" /* for DECLARE_HOOK, DECLARE_KOOH */
+/* clang-format on */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct zebra_vrf;
+
+/* Default port information. */
+#define ZEBRA_VTY_PORT 2601
+
+/* Default configuration filename. */
+#define DEFAULT_CONFIG_FILE "zebra.conf"
+
+#define ZEBRA_RMAP_DEFAULT_UPDATE_TIMER 5 /* disabled by default */
+
+
+/* Stale route marker timer */
+#define ZEBRA_DEFAULT_STALE_UPDATE_DELAY 1
+
+/* Count of stale routes processed in timer context */
+#define ZEBRA_MAX_STALE_ROUTE_COUNT 50000
+
+/* Graceful Restart information */
+struct client_gr_info {
+ /* VRF for which GR enabled */
+ vrf_id_t vrf_id;
+
+ /* Stale time and GR cap */
+ uint32_t stale_removal_time;
+ enum zserv_client_capabilities capabilities;
+
+ /* GR commands */
+ bool do_delete;
+ bool gr_enable;
+ bool stale_client;
+
+ /* Route sync and enable flags for AFI/SAFI */
+ bool af_enabled[AFI_MAX];
+ bool route_sync[AFI_MAX];
+
+ /* Book keeping */
+ void *stale_client_ptr;
+ struct event *t_stale_removal;
+
+ TAILQ_ENTRY(client_gr_info) gr_info;
+};
+
+/* Client structure. */
+struct zserv {
+ /* Client pthread */
+ struct frr_pthread *pthread;
+
+ /* Client file descriptor. */
+ int sock;
+
+ /* Attributes used to permit access to zapi clients from
+ * other pthreads: the client has a busy counter, and a
+ * 'closed' flag. These attributes are managed using a
+ * lock, via the acquire_client() and release_client() apis.
+ */
+ int busy_count;
+ bool is_closed;
+
+ /* Input/output buffer to the client. */
+ pthread_mutex_t ibuf_mtx;
+ struct stream_fifo *ibuf_fifo;
+ pthread_mutex_t obuf_mtx;
+ struct stream_fifo *obuf_fifo;
+
+ /* Private I/O buffers */
+ struct stream *ibuf_work;
+ struct stream *obuf_work;
+
+ /* Buffer of data waiting to be written to client. */
+ struct buffer *wb;
+
+ /* Threads for read/write. */
+ struct event *t_read;
+ struct event *t_write;
+
+ /* Event for message processing, for the main pthread */
+ struct event *t_process;
+
+ /* Event for the main pthread */
+ struct event *t_cleanup;
+
+ /* This client's redistribute flag. */
+ struct redist_proto mi_redist[AFI_MAX][ZEBRA_ROUTE_MAX];
+ vrf_bitmap_t redist[AFI_MAX][ZEBRA_ROUTE_MAX];
+
+ /* Redistribute default route flag. */
+ vrf_bitmap_t redist_default[AFI_MAX];
+
+ /* Router-id information. */
+ vrf_bitmap_t ridinfo[AFI_MAX];
+
+ /* Router-id information. */
+ vrf_bitmap_t nhrp_neighinfo[AFI_MAX];
+
+ bool notify_owner;
+
+ /* Indicates if client is synchronous. */
+ bool synchronous;
+
+ /* client's protocol and session info */
+ uint8_t proto;
+ uint16_t instance;
+ uint32_t session_id;
+
+ /*
+ * Interested for MLAG Updates, and also stores the client
+ * interested message mask
+ */
+ bool mlag_updates_interested;
+ uint32_t mlag_reg_mask1;
+
+ /* Statistics */
+ uint32_t redist_v4_add_cnt;
+ uint32_t redist_v4_del_cnt;
+ uint32_t redist_v6_add_cnt;
+ uint32_t redist_v6_del_cnt;
+ uint32_t v4_route_add_cnt;
+ uint32_t v4_route_upd8_cnt;
+ uint32_t v4_route_del_cnt;
+ uint32_t v6_route_add_cnt;
+ uint32_t v6_route_del_cnt;
+ uint32_t v6_route_upd8_cnt;
+ uint32_t connected_rt_add_cnt;
+ uint32_t connected_rt_del_cnt;
+ uint32_t ifup_cnt;
+ uint32_t ifdown_cnt;
+ uint32_t ifadd_cnt;
+ uint32_t ifdel_cnt;
+ uint32_t if_bfd_cnt;
+ uint32_t bfd_peer_add_cnt;
+ uint32_t bfd_peer_upd8_cnt;
+ uint32_t bfd_peer_del_cnt;
+ uint32_t bfd_peer_replay_cnt;
+ uint32_t vrfadd_cnt;
+ uint32_t vrfdel_cnt;
+ uint32_t if_vrfchg_cnt;
+ uint32_t bfd_client_reg_cnt;
+ uint32_t vniadd_cnt;
+ uint32_t vnidel_cnt;
+ uint32_t l3vniadd_cnt;
+ uint32_t l3vnidel_cnt;
+ uint32_t macipadd_cnt;
+ uint32_t macipdel_cnt;
+ uint32_t prefixadd_cnt;
+ uint32_t prefixdel_cnt;
+ uint32_t v4_nh_watch_add_cnt;
+ uint32_t v4_nh_watch_rem_cnt;
+ uint32_t v6_nh_watch_add_cnt;
+ uint32_t v6_nh_watch_rem_cnt;
+ uint32_t vxlan_sg_add_cnt;
+ uint32_t vxlan_sg_del_cnt;
+ uint32_t local_es_add_cnt;
+ uint32_t local_es_del_cnt;
+ uint32_t local_es_evi_add_cnt;
+ uint32_t local_es_evi_del_cnt;
+ uint32_t error_cnt;
+
+ time_t nh_reg_time;
+ time_t nh_dereg_time;
+ time_t nh_last_upd_time;
+
+ /*
+ * Session information.
+ *
+ * These are not synchronous with respect to each other. For instance,
+ * last_read_cmd may contain a value that has been read in the future
+ * relative to last_read_time.
+ */
+
+ pthread_mutex_t stats_mtx;
+ /* BEGIN covered by stats_mtx */
+
+ /* monotime of client creation */
+ uint64_t connect_time;
+ /* monotime of last message received */
+ uint64_t last_read_time;
+ /* monotime of last message sent */
+ uint64_t last_write_time;
+ /* command code of last message read */
+ uint64_t last_read_cmd;
+ /* command code of last message written */
+ uint64_t last_write_cmd;
+
+ /* END covered by stats_mtx */
+
+ /*
+ * Number of instances configured with
+ * graceful restart
+ */
+ uint32_t gr_instance_count;
+ time_t restart_time;
+
+ /*
+ * Graceful restart information for
+ * each instance
+ */
+ TAILQ_HEAD(info_list, client_gr_info) gr_info_queue;
+};
+
+#define ZAPI_HANDLER_ARGS \
+ struct zserv *client, struct zmsghdr *hdr, struct stream *msg, \
+ struct zebra_vrf *zvrf
+
+/* Hooks for client connect / disconnect */
+DECLARE_HOOK(zserv_client_connect, (struct zserv *client), (client));
+DECLARE_KOOH(zserv_client_close, (struct zserv *client), (client));
+
+#define DYNAMIC_CLIENT_GR_DISABLED(_client) \
+ ((_client->proto <= ZEBRA_ROUTE_CONNECT) \
+ || !(_client->gr_instance_count))
+
+/*
+ * Initialize Zebra API server.
+ *
+ * Installs CLI commands and creates the client list.
+ */
+extern void zserv_init(void);
+
+/*
+ * Stop the Zebra API server.
+ *
+ * closes the socket
+ */
+extern void zserv_close(void);
+
+/*
+ * Start Zebra API server.
+ *
+ * Allocates resources, creates the server socket and begins listening on the
+ * socket.
+ *
+ * path
+ * where to place the Unix domain socket
+ */
+extern void zserv_start(char *path);
+
+/*
+ * Send a message to a connected Zebra API client.
+ *
+ * client
+ * the client to send to
+ *
+ * msg
+ * the message to send
+ */
+extern int zserv_send_message(struct zserv *client, struct stream *msg);
+
+/*
+ * Send a batch of messages to a connected Zebra API client.
+ *
+ * client
+ * the client to send to
+ *
+ * fifo
+ * the list of messages to send
+ */
+extern int zserv_send_batch(struct zserv *client, struct stream_fifo *fifo);
+
+/*
+ * Retrieve a client by its protocol and instance number.
+ *
+ * proto
+ * protocol number
+ *
+ * instance
+ * instance number
+ *
+ * Returns:
+ * The Zebra API client.
+ */
+extern struct zserv *zserv_find_client(uint8_t proto, unsigned short instance);
+
+/*
+ * Retrieve a client by its protocol, instance number, and session id.
+ *
+ * proto
+ * protocol number
+ *
+ * instance
+ * instance number
+ *
+ * session_id
+ * session id
+ *
+ * Returns:
+ * The Zebra API client.
+ */
+struct zserv *zserv_find_client_session(uint8_t proto, unsigned short instance,
+ uint32_t session_id);
+
+/*
+ * Retrieve a client object by the complete tuple of
+ * {protocol, instance, session}. This version supports use
+ * from a different pthread: the object will be returned marked
+ * in-use. The caller *must* release the client object with the
+ * release_client() api, to ensure that the in-use marker is cleared properly.
+ *
+ * Returns:
+ * The Zebra API client.
+ */
+extern struct zserv *zserv_acquire_client(uint8_t proto,
+ unsigned short instance,
+ uint32_t session_id);
+
+/*
+ * Release a client object that was acquired with the acquire_client() api.
+ * After this has been called, the pointer must not be used - it may be freed
+ * in another pthread if the client has closed.
+ */
+extern void zserv_release_client(struct zserv *client);
+
+/*
+ * Close a client.
+ *
+ * Kills a client's thread, removes the client from the client list and cleans
+ * up its resources.
+ *
+ * client
+ * the client to close
+ */
+extern void zserv_close_client(struct zserv *client);
+
+/*
+ * Free memory for a zserv client object - note that this does not
+ * clean up the internal allocations associated with the zserv client,
+ * this just free the struct's memory.
+ */
+void zserv_client_delete(struct zserv *client);
+
+/*
+ * Log a ZAPI message hexdump.
+ *
+ * errmsg
+ * Error message to include with packet hexdump
+ *
+ * msg
+ * Message to log
+ *
+ * hdr
+ * Message header
+ */
+void zserv_log_message(const char *errmsg, struct stream *msg,
+ struct zmsghdr *hdr);
+
+/* TODO */
+__attribute__((__noreturn__)) void zebra_finalize(struct event *event);
+
+/*
+ * Graceful restart functions.
+ */
+extern int zebra_gr_client_disconnect(struct zserv *client);
+extern void zebra_gr_client_reconnect(struct zserv *client);
+extern void zebra_gr_stale_client_cleanup(struct list *client_list);
+extern void zread_client_capabilities(struct zserv *client, struct zmsghdr *hdr,
+ struct stream *msg,
+ struct zebra_vrf *zvrf);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _ZEBRA_ZEBRA_H */