Adding upstream version 8.4.4.upstream/8.4.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1092 insertions, 0 deletions

diff --git a/pathd/path_pcep_controller.c b/pathd/path_pcep_controller.c
new file mode 100644
index 0000000..b9f2ba3
--- /dev/null
+++ b/pathd/path_pcep_controller.c
@@ -0,0 +1,1092 @@
+/*
+ * Copyright (C) 2020  NetDEF, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <zebra.h>
+
+#include "log.h"
+#include "command.h"
+#include "libfrr.h"
+#include "printfrr.h"
+#include "lib/version.h"
+#include "northbound.h"
+#include "frr_pthread.h"
+#include "jhash.h"
+#include "network.h"
+
+#include "pathd/pathd.h"
+#include "pathd/path_errors.h"
+#include "pathd/path_pcep.h"
+#include "pathd/path_pcep_controller.h"
+#include "pathd/path_pcep_pcc.h"
+#include "pathd/path_pcep_config.h"
+#include "pathd/path_pcep_debug.h"
+
+#define MAX_RECONNECT_DELAY 120
+
+/* Event handling data structures */
+enum pcep_ctrl_event_type {
+	EV_UPDATE_PCC_OPTS = 1,
+	EV_UPDATE_PCE_OPTS,
+	EV_REMOVE_PCC,
+	EV_PATHD_EVENT,
+	EV_SYNC_PATH,
+	EV_SYNC_DONE,
+	EV_PCEPLIB_EVENT,
+	EV_RESET_PCC_SESSION,
+	EV_SEND_REPORT,
+	EV_SEND_ERROR,
+	EV_PATH_REFINED
+};
+
+struct pcep_ctrl_event_data {
+	struct ctrl_state *ctrl_state;
+	enum pcep_ctrl_event_type type;
+	uint32_t sub_type;
+	int pcc_id;
+	void *payload;
+};
+
+struct pcep_main_event_data {
+	pcep_main_event_handler_t handler;
+	int pcc_id;
+	enum pcep_main_event_type type;
+	void *payload;
+};
+
+struct pcep_refine_path_event_data {
+	struct ctrl_state *ctrl_state;
+	int pcc_id;
+	pcep_refine_callback_t continue_lsp_update_handler;
+	struct path *path;
+	void *payload;
+};
+
+/* Synchronous call arguments */
+
+struct get_counters_args {
+	struct ctrl_state *ctrl_state;
+	int pcc_id;
+	struct counters_group *counters;
+};
+
+struct get_pcep_session_args {
+	struct ctrl_state *ctrl_state;
+	int pcc_id;
+	pcep_session *pcep_session;
+};
+
+/* Internal Functions Called From Main Thread */
+static int pcep_ctrl_halt_cb(struct frr_pthread *fpt, void **res);
+static void pcep_refine_path_event_cb(struct thread *thread);
+
+/* Internal Functions Called From Controller Thread */
+static void pcep_thread_finish_event_handler(struct thread *thread);
+
+/* Controller Thread Timer Handler */
+static int schedule_thread_timer(struct ctrl_state *ctrl_state, int pcc_id,
+				 enum pcep_ctrl_timer_type timer_type,
+				 enum pcep_ctrl_timeout_type timeout_type,
+				 uint32_t delay, void *payload,
+				 struct thread **thread);
+static int schedule_thread_timer_with_cb(
+	struct ctrl_state *ctrl_state, int pcc_id,
+	enum pcep_ctrl_timer_type timer_type,
+	enum pcep_ctrl_timeout_type timeout_type, uint32_t delay, void *payload,
+	struct thread **thread, pcep_ctrl_thread_callback timer_cb);
+static void pcep_thread_timer_handler(struct thread *thread);
+
+/* Controller Thread Socket read/write Handler */
+static int schedule_thread_socket(struct ctrl_state *ctrl_state, int pcc_id,
+				  enum pcep_ctrl_socket_type type, bool is_read,
+				  void *payload, int fd, struct thread **thread,
+				  pcep_ctrl_thread_callback cb);
+
+/* Controller Thread Event Handler */
+static int send_to_thread(struct ctrl_state *ctrl_state, int pcc_id,
+			  enum pcep_ctrl_event_type type, uint32_t sub_type,
+			  void *payload);
+static int send_to_thread_with_cb(struct ctrl_state *ctrl_state, int pcc_id,
+				  enum pcep_ctrl_event_type type,
+				  uint32_t sub_type, void *payload,
+				  pcep_ctrl_thread_callback event_cb);
+static void pcep_thread_event_handler(struct thread *thread);
+static int pcep_thread_event_update_pcc_options(struct ctrl_state *ctrl_state,
+						struct pcc_opts *opts);
+static int pcep_thread_event_update_pce_options(struct ctrl_state *ctrl_state,
+						int pcc_id,
+						struct pce_opts *opts);
+static int pcep_thread_event_remove_pcc_by_id(struct ctrl_state *ctrl_state,
+					      int pcc_id);
+static int pcep_thread_event_remove_pcc_all(struct ctrl_state *ctrl_state);
+static int pcep_thread_event_remove_pcc(struct ctrl_state *ctrl_state,
+					struct pce_opts *pce_opts);
+static int pcep_thread_event_sync_path(struct ctrl_state *ctrl_state,
+				       int pcc_id, struct path *path);
+static int pcep_thread_event_sync_done(struct ctrl_state *ctrl_state,
+				       int pcc_id);
+static int pcep_thread_event_pathd_event(struct ctrl_state *ctrl_state,
+					 enum pcep_pathd_event_type type,
+					 struct path *path);
+static void
+pcep_thread_path_refined_event(struct ctrl_state *ctrl_state,
+			       struct pcep_refine_path_event_data *data);
+
+/* Main Thread Event Handler */
+static int send_to_main(struct ctrl_state *ctrl_state, int pcc_id,
+			enum pcep_main_event_type type, void *payload);
+static void pcep_main_event_handler(struct thread *thread);
+
+/* Helper functions */
+static void set_ctrl_state(struct frr_pthread *fpt,
+			   struct ctrl_state *ctrl_state);
+static struct ctrl_state *get_ctrl_state(struct frr_pthread *fpt);
+int get_next_id(struct ctrl_state *ctrl_state);
+int set_pcc_state(struct ctrl_state *ctrl_state, struct pcc_state *pcc_state);
+void remove_pcc_state(struct ctrl_state *ctrl_state,
+		      struct pcc_state *pcc_state);
+static uint32_t backoff_delay(uint32_t max, uint32_t base, uint32_t attempt);
+static const char *timer_type_name(enum pcep_ctrl_timer_type type);
+static const char *timeout_type_name(enum pcep_ctrl_timeout_type type);
+
+
+/* ------------ API Functions Called from Main Thread ------------ */
+
+int pcep_ctrl_initialize(struct thread_master *main_thread,
+			 struct frr_pthread **fpt,
+			 pcep_main_event_handler_t event_handler)
+{
+	assert(fpt != NULL);
+
+	int ret = 0;
+	struct ctrl_state *ctrl_state;
+	struct frr_pthread_attr attr = {
+		.start = frr_pthread_attr_default.start,
+		.stop = pcep_ctrl_halt_cb,
+	};
+
+	PCEP_DEBUG("Initializing pcep module controller");
+
+	/* Create and start the FRR pthread */
+	*fpt = frr_pthread_new(&attr, "PCEP thread", "pcep_controller");
+	if (*fpt == NULL) {
+		flog_err(EC_PATH_SYSTEM_CALL,
+			 "failed to initialize PCEP thread");
+		return 1;
+	}
+	ret = frr_pthread_run(*fpt, NULL);
+	if (ret < 0) {
+		flog_err(EC_PATH_SYSTEM_CALL, "failed to create PCEP thread");
+		return ret;
+	}
+	frr_pthread_wait_running(*fpt);
+
+	/* Initialize the thread state */
+	ctrl_state = XCALLOC(MTYPE_PCEP, sizeof(*ctrl_state));
+	ctrl_state->main = main_thread;
+	ctrl_state->self = (*fpt)->master;
+	ctrl_state->main_event_handler = event_handler;
+	ctrl_state->pcc_count = 0;
+	ctrl_state->pcc_last_id = 0;
+	ctrl_state->pcc_opts =
+		XCALLOC(MTYPE_PCEP, sizeof(*ctrl_state->pcc_opts));
+	/* Default to no PCC address defined */
+	ctrl_state->pcc_opts->addr.ipa_type = IPADDR_NONE;
+	ctrl_state->pcc_opts->port = PCEP_DEFAULT_PORT;
+
+	/* Keep the state reference for events */
+	set_ctrl_state(*fpt, ctrl_state);
+
+	return ret;
+}
+
+int pcep_ctrl_finalize(struct frr_pthread **fpt)
+{
+	assert(fpt != NULL);
+
+	int ret = 0;
+
+	PCEP_DEBUG("Finalizing pcep module controller");
+
+	if (*fpt != NULL) {
+		frr_pthread_stop(*fpt, NULL);
+		*fpt = NULL;
+	}
+
+	return ret;
+}
+
+int pcep_ctrl_update_pcc_options(struct frr_pthread *fpt, struct pcc_opts *opts)
+{
+	struct ctrl_state *ctrl_state = get_ctrl_state(fpt);
+	return send_to_thread(ctrl_state, 0, EV_UPDATE_PCC_OPTS, 0, opts);
+}
+
+int pcep_ctrl_update_pce_options(struct frr_pthread *fpt, struct pce_opts *opts)
+{
+	struct ctrl_state *ctrl_state = get_ctrl_state(fpt);
+	return send_to_thread(ctrl_state, 0, EV_UPDATE_PCE_OPTS, 0, opts);
+}
+
+int pcep_ctrl_remove_pcc(struct frr_pthread *fpt, struct pce_opts *pce_opts)
+{
+	struct ctrl_state *ctrl_state = get_ctrl_state(fpt);
+	return send_to_thread(ctrl_state, 0, EV_REMOVE_PCC, 0, pce_opts);
+}
+
+int pcep_ctrl_reset_pcc_session(struct frr_pthread *fpt, char *pce_name)
+{
+	struct ctrl_state *ctrl_state = get_ctrl_state(fpt);
+	return send_to_thread(ctrl_state, 0, EV_RESET_PCC_SESSION, 0, pce_name);
+}
+
+int pcep_ctrl_pathd_event(struct frr_pthread *fpt,
+			  enum pcep_pathd_event_type type, struct path *path)
+{
+	struct ctrl_state *ctrl_state = get_ctrl_state(fpt);
+	return send_to_thread(ctrl_state, 0, EV_PATHD_EVENT, type, path);
+}
+
+int pcep_ctrl_sync_path(struct frr_pthread *fpt, int pcc_id, struct path *path)
+{
+	struct ctrl_state *ctrl_state = get_ctrl_state(fpt);
+	return send_to_thread(ctrl_state, pcc_id, EV_SYNC_PATH, 0, path);
+}
+
+int pcep_ctrl_sync_done(struct frr_pthread *fpt, int pcc_id)
+{
+	struct ctrl_state *ctrl_state = get_ctrl_state(fpt);
+	return send_to_thread(ctrl_state, pcc_id, EV_SYNC_DONE, 0, NULL);
+}
+
+struct counters_group *pcep_ctrl_get_counters(struct frr_pthread *fpt,
+					      int pcc_id)
+{
+	struct ctrl_state *ctrl_state = get_ctrl_state(fpt);
+	struct counters_group *counters = NULL;
+	struct pcc_state *pcc_state;
+	pcc_state = pcep_pcc_get_pcc_by_id(ctrl_state->pcc, pcc_id);
+	if (pcc_state) {
+		counters = pcep_lib_copy_counters(pcc_state->sess);
+	}
+	return counters;
+}
+
+pcep_session *pcep_ctrl_get_pcep_session(struct frr_pthread *fpt, int pcc_id)
+{
+	struct ctrl_state *ctrl_state = get_ctrl_state(fpt);
+	struct pcc_state *pcc_state;
+	pcep_session *session = NULL;
+
+	pcc_state = pcep_pcc_get_pcc_by_id(ctrl_state->pcc, pcc_id);
+	if (pcc_state) {
+		session = pcep_lib_copy_pcep_session(pcc_state->sess);
+	}
+	return session;
+}
+
+struct pcep_pcc_info *pcep_ctrl_get_pcc_info(struct frr_pthread *fpt,
+					     const char *pce_name)
+{
+	struct ctrl_state *ctrl_state = get_ctrl_state(fpt);
+	struct pcep_pcc_info *pcc_info = XCALLOC(MTYPE_PCEP, sizeof(*pcc_info));
+	if( pcc_info && ctrl_state){
+		strlcpy(pcc_info->pce_name, pce_name, sizeof(pcc_info->pce_name));
+		pcep_pcc_copy_pcc_info(ctrl_state->pcc, pcc_info);
+	}
+
+	return pcc_info;
+}
+
+int pcep_ctrl_send_report(struct frr_pthread *fpt, int pcc_id,
+			  struct path *path, bool is_stable)
+{
+	struct ctrl_state *ctrl_state = get_ctrl_state(fpt);
+	return send_to_thread(ctrl_state, pcc_id, EV_SEND_REPORT, is_stable,
+			      path);
+}
+
+
+int pcep_ctrl_send_error(struct frr_pthread *fpt, int pcc_id,
+			 struct pcep_error *error)
+{
+	struct ctrl_state *ctrl_state = get_ctrl_state(fpt);
+	return send_to_thread(ctrl_state, pcc_id, EV_SEND_ERROR, 0, error);
+}
+
+
+/* ------------ Internal Functions Called from Main Thread ------------ */
+
+int pcep_ctrl_halt_cb(struct frr_pthread *fpt, void **res)
+{
+	thread_add_event(fpt->master, pcep_thread_finish_event_handler,
+			 (void *)fpt, 0, NULL);
+	pthread_join(fpt->thread, res);
+
+	return 0;
+}
+
+void pcep_refine_path_event_cb(struct thread *thread)
+{
+	struct pcep_refine_path_event_data *data = THREAD_ARG(thread);
+	assert(data != NULL);
+	struct ctrl_state *ctrl_state = data->ctrl_state;
+	struct path *path = data->path;
+	assert(path != NULL);
+	int pcc_id = data->pcc_id;
+
+
+	path_pcep_refine_path(path);
+	send_to_thread(ctrl_state, pcc_id, EV_PATH_REFINED, 0, data);
+}
+
+
+/* ------------ API Functions Called From Controller Thread ------------ */
+
+void pcep_thread_start_sync(struct ctrl_state *ctrl_state, int pcc_id)
+{
+	send_to_main(ctrl_state, pcc_id, PCEP_MAIN_EVENT_START_SYNC, NULL);
+}
+
+void pcep_thread_update_path(struct ctrl_state *ctrl_state, int pcc_id,
+			     struct path *path)
+{
+	send_to_main(ctrl_state, pcc_id, PCEP_MAIN_EVENT_UPDATE_CANDIDATE,
+		     path);
+}
+
+void pcep_thread_initiate_path(struct ctrl_state *ctrl_state, int pcc_id,
+			       struct path *path)
+{
+	send_to_main(ctrl_state, pcc_id, PCEP_MAIN_EVENT_INITIATE_CANDIDATE,
+		     path);
+}
+
+void pcep_thread_remove_candidate_path_segments(struct ctrl_state *ctrl_state,
+						struct pcc_state *pcc_state)
+{
+	if (!pcc_state)
+		return;
+	/* Will be deleted when the event is handled */
+	char *originator = XSTRDUP(MTYPE_PCEP, pcc_state->originator);
+	PCEP_DEBUG("schedule candidate path segments removal for originator %s",
+		   originator);
+	send_to_main(ctrl_state, pcep_pcc_get_pcc_id(pcc_state),
+		     PCEP_MAIN_EVENT_REMOVE_CANDIDATE_LSP, originator);
+}
+
+void pcep_thread_schedule_sync_best_pce(struct ctrl_state *ctrl_state,
+					int pcc_id, int delay,
+					struct thread **thread)
+{
+
+	schedule_thread_timer(ctrl_state, pcc_id, TM_CALCULATE_BEST_PCE,
+			      TO_UNDEFINED, delay, NULL, thread);
+}
+
+void pcep_thread_cancel_timer(struct thread **thread)
+{
+	if (thread == NULL || *thread == NULL) {
+		return;
+	}
+
+	struct pcep_ctrl_timer_data *data = THREAD_ARG(*thread);
+	PCEP_DEBUG("Timer %s / %s canceled", timer_type_name(data->timer_type),
+		   timeout_type_name(data->timeout_type));
+	if (data != NULL) {
+		XFREE(MTYPE_PCEP, data);
+	}
+
+	if ((*thread)->master->owner == pthread_self()) {
+		thread_cancel(thread);
+	} else {
+		thread_cancel_async((*thread)->master, thread, NULL);
+	}
+}
+
+void pcep_thread_schedule_reconnect(struct ctrl_state *ctrl_state, int pcc_id,
+				    int retry_count, struct thread **thread)
+{
+	uint32_t delay = backoff_delay(MAX_RECONNECT_DELAY, 1, retry_count);
+	PCEP_DEBUG("Schedule RECONNECT_PCC for %us (retry %u)", delay,
+		   retry_count);
+	schedule_thread_timer(ctrl_state, pcc_id, TM_RECONNECT_PCC,
+			      TO_UNDEFINED, delay, NULL, thread);
+}
+
+void pcep_thread_schedule_timeout(struct ctrl_state *ctrl_state, int pcc_id,
+				  enum pcep_ctrl_timeout_type timeout_type,
+				  uint32_t delay, void *param,
+				  struct thread **thread)
+{
+	assert(timeout_type > TO_UNDEFINED);
+	assert(timeout_type < TO_MAX);
+	PCEP_DEBUG("Schedule timeout %s for %us",
+		   timeout_type_name(timeout_type), delay);
+	schedule_thread_timer(ctrl_state, pcc_id, TM_TIMEOUT, timeout_type,
+			      delay, param, thread);
+}
+
+void pcep_thread_schedule_pceplib_timer(struct ctrl_state *ctrl_state,
+					int delay, void *payload,
+					struct thread **thread,
+					pcep_ctrl_thread_callback timer_cb)
+{
+	PCEP_DEBUG("Schedule PCEPLIB_TIMER for %us", delay);
+	schedule_thread_timer_with_cb(ctrl_state, 0, TM_PCEPLIB_TIMER,
+				      TO_UNDEFINED, delay, payload, thread,
+				      timer_cb);
+}
+
+void pcep_thread_schedule_session_timeout(struct ctrl_state *ctrl_state,
+					  int pcc_id, int delay,
+					  struct thread **thread)
+{
+	PCEP_DEBUG("Schedule session_timeout interval for %us", delay);
+	schedule_thread_timer(ctrl_state, pcc_id, TM_SESSION_TIMEOUT_PCC,
+			      TO_UNDEFINED, delay, NULL, thread);
+}
+
+int pcep_thread_pcc_count(struct ctrl_state *ctrl_state)
+{
+	if (ctrl_state == NULL) {
+		return 0;
+	}
+
+	return ctrl_state->pcc_count;
+}
+
+int pcep_thread_refine_path(struct ctrl_state *ctrl_state, int pcc_id,
+			    pcep_refine_callback_t cb, struct path *path,
+			    void *payload)
+{
+	struct pcep_refine_path_event_data *data;
+
+	data = XCALLOC(MTYPE_PCEP, sizeof(*data));
+	data->ctrl_state = ctrl_state;
+	data->path = path;
+	data->pcc_id = pcc_id;
+	data->continue_lsp_update_handler = cb;
+	data->payload = payload;
+
+	thread_add_event(ctrl_state->main, pcep_refine_path_event_cb,
+			 (void *)data, 0, NULL);
+	return 0;
+}
+
+void pcep_thread_path_refined_event(struct ctrl_state *ctrl_state,
+				    struct pcep_refine_path_event_data *data)
+{
+	assert(data != NULL);
+	int pcc_id = data->pcc_id;
+	pcep_refine_callback_t continue_lsp_update_handler = data->continue_lsp_update_handler;
+	assert(continue_lsp_update_handler != NULL);
+	struct path *path = data->path;
+	void *payload = data->payload;
+	struct pcc_state *pcc_state = NULL;
+	XFREE(MTYPE_PCEP, data);
+
+	pcc_state = pcep_pcc_get_pcc_by_id(ctrl_state->pcc, pcc_id);
+	continue_lsp_update_handler(ctrl_state, pcc_state, path, payload);
+}
+
+
+/* ------------ Internal Functions Called From Controller Thread ------------ */
+
+void pcep_thread_finish_event_handler(struct thread *thread)
+{
+	int i;
+	struct frr_pthread *fpt = THREAD_ARG(thread);
+	struct ctrl_state *ctrl_state = fpt->data;
+
+	assert(ctrl_state != NULL);
+
+	for (i = 0; i < MAX_PCC; i++) {
+		if (ctrl_state->pcc[i]) {
+			pcep_pcc_finalize(ctrl_state, ctrl_state->pcc[i]);
+			ctrl_state->pcc[i] = NULL;
+		}
+	}
+
+	XFREE(MTYPE_PCEP, ctrl_state->pcc_opts);
+	XFREE(MTYPE_PCEP, ctrl_state);
+	fpt->data = NULL;
+
+	atomic_store_explicit(&fpt->running, false, memory_order_relaxed);
+}
+
+/* ------------ Controller Thread Timer Handler ------------ */
+
+int schedule_thread_timer_with_cb(struct ctrl_state *ctrl_state, int pcc_id,
+				  enum pcep_ctrl_timer_type timer_type,
+				  enum pcep_ctrl_timeout_type timeout_type,
+				  uint32_t delay, void *payload,
+				  struct thread **thread,
+				  pcep_ctrl_thread_callback timer_cb)
+{
+	assert(thread != NULL);
+
+	struct pcep_ctrl_timer_data *data;
+
+	data = XCALLOC(MTYPE_PCEP, sizeof(*data));
+	data->ctrl_state = ctrl_state;
+	data->timer_type = timer_type;
+	data->timeout_type = timeout_type;
+	data->pcc_id = pcc_id;
+	data->payload = payload;
+
+	thread_add_timer(ctrl_state->self, timer_cb, (void *)data, delay,
+			 thread);
+
+	return 0;
+}
+
+int schedule_thread_timer(struct ctrl_state *ctrl_state, int pcc_id,
+			  enum pcep_ctrl_timer_type timer_type,
+			  enum pcep_ctrl_timeout_type timeout_type,
+			  uint32_t delay, void *payload, struct thread **thread)
+{
+	return schedule_thread_timer_with_cb(ctrl_state, pcc_id, timer_type,
+					     timeout_type, delay, payload,
+					     thread, pcep_thread_timer_handler);
+}
+
+void pcep_thread_timer_handler(struct thread *thread)
+{
+	/* data unpacking */
+	struct pcep_ctrl_timer_data *data = THREAD_ARG(thread);
+	assert(data != NULL);
+	struct ctrl_state *ctrl_state = data->ctrl_state;
+	assert(ctrl_state != NULL);
+	enum pcep_ctrl_timer_type timer_type = data->timer_type;
+	enum pcep_ctrl_timeout_type timeout_type = data->timeout_type;
+	int pcc_id = data->pcc_id;
+	void *param = data->payload;
+	XFREE(MTYPE_PCEP, data);
+
+	struct pcc_state *pcc_state = NULL;
+
+	switch (timer_type) {
+	case TM_RECONNECT_PCC:
+		pcc_state = pcep_pcc_get_pcc_by_id(ctrl_state->pcc, pcc_id);
+		if (!pcc_state)
+			return;
+		pcep_pcc_reconnect(ctrl_state, pcc_state);
+		break;
+	case TM_TIMEOUT:
+		pcc_state = pcep_pcc_get_pcc_by_id(ctrl_state->pcc, pcc_id);
+		if (!pcc_state)
+			return;
+		pcep_pcc_timeout_handler(ctrl_state, pcc_state, timeout_type,
+					 param);
+		break;
+	case TM_CALCULATE_BEST_PCE:
+		/* Previous best disconnect so new best should be synced */
+		pcep_pcc_timer_update_best_pce(ctrl_state, pcc_id);
+		break;
+	case TM_SESSION_TIMEOUT_PCC:
+		pcc_state = pcep_pcc_get_pcc_by_id(ctrl_state->pcc, pcc_id);
+		pcep_thread_remove_candidate_path_segments(ctrl_state,
+							   pcc_state);
+		break;
+	default:
+		flog_warn(EC_PATH_PCEP_RECOVERABLE_INTERNAL_ERROR,
+			  "Unknown controller timer triggered: %u", timer_type);
+		break;
+	}
+}
+
+void pcep_thread_pcep_event(struct thread *thread)
+{
+	struct pcep_ctrl_event_data *data = THREAD_ARG(thread);
+	assert(data != NULL);
+	struct ctrl_state *ctrl_state = data->ctrl_state;
+	pcep_event *event = data->payload;
+	XFREE(MTYPE_PCEP, data);
+	int i;
+
+	for (i = 0; i < MAX_PCC; i++) {
+		if (ctrl_state->pcc[i]) {
+			struct pcc_state *pcc_state = ctrl_state->pcc[i];
+			if (pcc_state->sess != event->session)
+				continue;
+			pcep_pcc_pcep_event_handler(ctrl_state, pcc_state,
+						    event);
+			break;
+		}
+	}
+	destroy_pcep_event(event);
+}
+
+/* ------------ Controller Thread Socket Functions ------------ */
+
+int schedule_thread_socket(struct ctrl_state *ctrl_state, int pcc_id,
+			   enum pcep_ctrl_socket_type type, bool is_read,
+			   void *payload, int fd, struct thread **thread,
+			   pcep_ctrl_thread_callback socket_cb)
+{
+	assert(thread != NULL);
+
+	struct pcep_ctrl_socket_data *data;
+
+	data = XCALLOC(MTYPE_PCEP, sizeof(*data));
+	data->ctrl_state = ctrl_state;
+	data->type = type;
+	data->is_read = is_read;
+	data->fd = fd;
+	data->pcc_id = pcc_id;
+	data->payload = payload;
+
+	if (is_read) {
+		thread_add_read(ctrl_state->self, socket_cb, (void *)data, fd,
+				thread);
+	} else {
+		thread_add_write(ctrl_state->self, socket_cb, (void *)data, fd,
+				 thread);
+	}
+
+	return 0;
+}
+
+int pcep_thread_socket_write(void *fpt, void **thread, int fd, void *payload,
+			     pcep_ctrl_thread_callback socket_cb)
+{
+	struct ctrl_state *ctrl_state = ((struct frr_pthread *)fpt)->data;
+
+	return schedule_thread_socket(ctrl_state, 0, SOCK_PCEPLIB, false,
+				      payload, fd, (struct thread **)thread,
+				      socket_cb);
+}
+
+int pcep_thread_socket_read(void *fpt, void **thread, int fd, void *payload,
+			    pcep_ctrl_thread_callback socket_cb)
+{
+	struct ctrl_state *ctrl_state = ((struct frr_pthread *)fpt)->data;
+
+	return schedule_thread_socket(ctrl_state, 0, SOCK_PCEPLIB, true,
+				      payload, fd, (struct thread **)thread,
+				      socket_cb);
+}
+
+int pcep_thread_send_ctrl_event(void *fpt, void *payload,
+				pcep_ctrl_thread_callback cb)
+{
+	struct ctrl_state *ctrl_state = ((struct frr_pthread *)fpt)->data;
+
+	return send_to_thread_with_cb(ctrl_state, 0, EV_PCEPLIB_EVENT, 0,
+				      payload, cb);
+}
+
+/* ------------ Controller Thread Event Handler ------------ */
+
+int send_to_thread(struct ctrl_state *ctrl_state, int pcc_id,
+		   enum pcep_ctrl_event_type type, uint32_t sub_type,
+		   void *payload)
+{
+	return send_to_thread_with_cb(ctrl_state, pcc_id, type, sub_type,
+				      payload, pcep_thread_event_handler);
+}
+
+int send_to_thread_with_cb(struct ctrl_state *ctrl_state, int pcc_id,
+			   enum pcep_ctrl_event_type type, uint32_t sub_type,
+			   void *payload, pcep_ctrl_thread_callback event_cb)
+{
+	struct pcep_ctrl_event_data *data;
+
+	data = XCALLOC(MTYPE_PCEP, sizeof(*data));
+	data->ctrl_state = ctrl_state;
+	data->type = type;
+	data->sub_type = sub_type;
+	data->pcc_id = pcc_id;
+	data->payload = payload;
+
+	thread_add_event(ctrl_state->self, event_cb, (void *)data, 0, NULL);
+
+	return 0;
+}
+
+void pcep_thread_event_handler(struct thread *thread)
+{
+	/* data unpacking */
+	struct pcep_ctrl_event_data *data = THREAD_ARG(thread);
+	assert(data != NULL);
+	struct ctrl_state *ctrl_state = data->ctrl_state;
+	assert(ctrl_state != NULL);
+	enum pcep_ctrl_event_type type = data->type;
+	uint32_t sub_type = data->sub_type;
+	int pcc_id = data->pcc_id;
+	void *payload = data->payload;
+	XFREE(MTYPE_PCEP, data);
+
+	/* Possible sub-type values */
+	enum pcep_pathd_event_type path_event_type = PCEP_PATH_UNDEFINED;
+
+	/* Possible payload values, maybe an union would be better... */
+	struct path *path = NULL;
+	struct pcc_opts *pcc_opts = NULL;
+	struct pce_opts *pce_opts = NULL;
+	struct pcc_state *pcc_state = NULL;
+	struct pcep_refine_path_event_data *refine_data = NULL;
+
+	struct path *path_copy = NULL;
+	struct pcep_error *error = NULL;
+
+	switch (type) {
+	case EV_UPDATE_PCC_OPTS:
+		assert(payload != NULL);
+		pcc_opts = (struct pcc_opts *)payload;
+		pcep_thread_event_update_pcc_options(ctrl_state, pcc_opts);
+		break;
+	case EV_UPDATE_PCE_OPTS:
+		assert(payload != NULL);
+		pce_opts = (struct pce_opts *)payload;
+		pcep_thread_event_update_pce_options(ctrl_state, pcc_id,
+						     pce_opts);
+		break;
+	case EV_REMOVE_PCC:
+		pce_opts = (struct pce_opts *)payload;
+		if (pcep_thread_event_remove_pcc(ctrl_state, pce_opts) == 0)
+			pcep_pcc_multi_pce_remove_pcc(ctrl_state,
+						      ctrl_state->pcc);
+		break;
+	case EV_PATHD_EVENT:
+		assert(payload != NULL);
+		path_event_type = (enum pcep_pathd_event_type)sub_type;
+		path = (struct path *)payload;
+		pcep_thread_event_pathd_event(ctrl_state, path_event_type,
+					      path);
+		break;
+	case EV_SYNC_PATH:
+		assert(payload != NULL);
+		path = (struct path *)payload;
+		pcep_pcc_multi_pce_sync_path(ctrl_state, pcc_id,
+					     ctrl_state->pcc);
+		pcep_thread_event_sync_path(ctrl_state, pcc_id, path);
+		break;
+	case EV_SYNC_DONE:
+		pcep_thread_event_sync_done(ctrl_state, pcc_id);
+		break;
+	case EV_RESET_PCC_SESSION:
+		pcc_state = pcep_pcc_get_pcc_by_name(ctrl_state->pcc,
+						     (const char *)payload);
+		if (pcc_state) {
+			pcep_pcc_disable(ctrl_state, pcc_state);
+			pcep_pcc_enable(ctrl_state, pcc_state);
+		} else {
+			flog_warn(EC_PATH_PCEP_RECOVERABLE_INTERNAL_ERROR,
+				  "Cannot reset state for PCE: %s",
+				  (const char *)payload);
+		}
+		break;
+	case EV_SEND_REPORT:
+		assert(payload != NULL);
+		path = (struct path *)payload;
+		if (pcc_id == 0) {
+			for (int i = 0; i < MAX_PCC; i++) {
+				if (ctrl_state->pcc[i]) {
+					path_copy = pcep_copy_path(path);
+					pcep_pcc_send_report(
+						ctrl_state, ctrl_state->pcc[i],
+						path_copy, (bool)sub_type);
+				}
+			}
+		} else {
+			pcc_state =
+				pcep_pcc_get_pcc_by_id(ctrl_state->pcc, pcc_id);
+			pcep_pcc_send_report(ctrl_state, pcc_state, path,
+					     (bool)sub_type);
+		}
+		break;
+	case EV_PATH_REFINED:
+		assert(payload != NULL);
+		refine_data = (struct pcep_refine_path_event_data *)payload;
+		pcep_thread_path_refined_event(ctrl_state, refine_data);
+		break;
+	case EV_SEND_ERROR:
+		assert(payload != NULL);
+		error = (struct pcep_error *)payload;
+		pcc_state = pcep_pcc_get_pcc_by_id(ctrl_state->pcc, pcc_id);
+		pcep_pcc_send_error(ctrl_state, pcc_state, error,
+				    (bool)sub_type);
+		break;
+	default:
+		flog_warn(EC_PATH_PCEP_RECOVERABLE_INTERNAL_ERROR,
+			  "Unexpected event received in controller thread: %u",
+			  type);
+		break;
+	}
+}
+
+int pcep_thread_event_update_pcc_options(struct ctrl_state *ctrl_state,
+					 struct pcc_opts *opts)
+{
+	assert(opts != NULL);
+	if (ctrl_state->pcc_opts != NULL) {
+		XFREE(MTYPE_PCEP, ctrl_state->pcc_opts);
+	}
+	ctrl_state->pcc_opts = opts;
+	return 0;
+}
+
+int pcep_thread_event_update_pce_options(struct ctrl_state *ctrl_state,
+					 int pcc_id, struct pce_opts *pce_opts)
+{
+	if (!pce_opts || !ctrl_state) {
+		return 0;
+	}
+	struct pcc_state *pcc_state;
+	struct pcc_opts *pcc_opts;
+
+	int current_pcc_id =
+		pcep_pcc_get_pcc_id_by_ip_port(ctrl_state->pcc, pce_opts);
+	if (current_pcc_id) {
+		pcc_state =
+			pcep_pcc_get_pcc_by_id(ctrl_state->pcc, current_pcc_id);
+	} else {
+		pcc_state = pcep_pcc_initialize(ctrl_state,
+						get_next_id(ctrl_state));
+		if (set_pcc_state(ctrl_state, pcc_state)) {
+			XFREE(MTYPE_PCEP, pcc_state);
+			return 0;
+		}
+	}
+
+	/* Copy the pcc options to delegate it to the update function */
+	pcc_opts = XCALLOC(MTYPE_PCEP, sizeof(*pcc_opts));
+	memcpy(pcc_opts, ctrl_state->pcc_opts, sizeof(*pcc_opts));
+
+	if (pcep_pcc_update(ctrl_state, pcc_state, pcc_opts, pce_opts)) {
+		flog_err(EC_PATH_PCEP_PCC_CONF_UPDATE,
+			 "failed to update PCC configuration");
+	}
+
+
+	return 0;
+}
+
+int pcep_thread_event_remove_pcc_by_id(struct ctrl_state *ctrl_state,
+				       int pcc_id)
+{
+	if (pcc_id) {
+		struct pcc_state *pcc_state =
+			pcep_pcc_get_pcc_by_id(ctrl_state->pcc, pcc_id);
+		if (pcc_state) {
+			remove_pcc_state(ctrl_state, pcc_state);
+			pcep_pcc_finalize(ctrl_state, pcc_state);
+		}
+	}
+	return 0;
+}
+
+int pcep_thread_event_remove_pcc_all(struct ctrl_state *ctrl_state)
+{
+	assert(ctrl_state != NULL);
+
+	for (int i = 0; i < MAX_PCC; i++) {
+		pcep_thread_event_remove_pcc_by_id(
+			ctrl_state,
+			pcep_pcc_get_pcc_id_by_idx(ctrl_state->pcc, i));
+	}
+	return 0;
+}
+
+int pcep_thread_event_remove_pcc(struct ctrl_state *ctrl_state,
+				 struct pce_opts *pce_opts)
+{
+	assert(ctrl_state != NULL);
+
+	if (pce_opts) {
+		int pcc_id = pcep_pcc_get_pcc_id_by_ip_port(ctrl_state->pcc,
+							    pce_opts);
+		if (pcc_id) {
+			pcep_thread_event_remove_pcc_by_id(ctrl_state, pcc_id);
+		} else {
+			return -1;
+		}
+		XFREE(MTYPE_PCEP, pce_opts);
+	} else {
+		pcep_thread_event_remove_pcc_all(ctrl_state);
+	}
+
+	return 0;
+}
+
+int pcep_thread_event_sync_path(struct ctrl_state *ctrl_state, int pcc_id,
+				struct path *path)
+{
+	struct pcc_state *pcc_state =
+		pcep_pcc_get_pcc_by_id(ctrl_state->pcc, pcc_id);
+	pcep_pcc_sync_path(ctrl_state, pcc_state, path);
+	pcep_free_path(path);
+	return 0;
+}
+
+int pcep_thread_event_sync_done(struct ctrl_state *ctrl_state, int pcc_id)
+{
+	struct pcc_state *pcc_state =
+		pcep_pcc_get_pcc_by_id(ctrl_state->pcc, pcc_id);
+	pcep_pcc_sync_done(ctrl_state, pcc_state);
+	return 0;
+}
+
+int pcep_thread_event_pathd_event(struct ctrl_state *ctrl_state,
+				  enum pcep_pathd_event_type type,
+				  struct path *path)
+{
+	int i;
+
+	for (i = 0; i < MAX_PCC; i++) {
+		if (ctrl_state->pcc[i]) {
+			struct pcc_state *pcc_state = ctrl_state->pcc[i];
+			pcep_pcc_pathd_event_handler(ctrl_state, pcc_state,
+						     type, path);
+		}
+	}
+
+	pcep_free_path(path);
+
+	return 0;
+}
+
+
+/* ------------ Main Thread Event Handler ------------ */
+
+int send_to_main(struct ctrl_state *ctrl_state, int pcc_id,
+		 enum pcep_main_event_type type, void *payload)
+{
+	struct pcep_main_event_data *data;
+
+	data = XCALLOC(MTYPE_PCEP, sizeof(*data));
+	data->handler = ctrl_state->main_event_handler;
+	data->type = type;
+	data->pcc_id = pcc_id;
+	data->payload = payload;
+
+	thread_add_event(ctrl_state->main, pcep_main_event_handler,
+			 (void *)data, 0, NULL);
+	return 0;
+}
+
+void pcep_main_event_handler(struct thread *thread)
+{
+	/* data unpacking */
+	struct pcep_main_event_data *data = THREAD_ARG(thread);
+	assert(data != NULL);
+	pcep_main_event_handler_t handler = data->handler;
+	enum pcep_main_event_type type = data->type;
+	int pcc_id = data->pcc_id;
+	void *payload = data->payload;
+	XFREE(MTYPE_PCEP, data);
+
+	handler(type, pcc_id, payload);
+}
+
+
+/* ------------ Helper functions ------------ */
+
+void set_ctrl_state(struct frr_pthread *fpt, struct ctrl_state *ctrl_state)
+{
+	assert(fpt != NULL);
+	fpt->data = ctrl_state;
+}
+
+struct ctrl_state *get_ctrl_state(struct frr_pthread *fpt)
+{
+	assert(fpt != NULL);
+	assert(fpt->data != NULL);
+
+	struct ctrl_state *ctrl_state;
+	ctrl_state = (struct ctrl_state *)fpt->data;
+	assert(ctrl_state != NULL);
+	return ctrl_state;
+}
+
+int get_next_id(struct ctrl_state *ctrl_state)
+{
+	return ++ctrl_state->pcc_last_id;
+}
+
+int set_pcc_state(struct ctrl_state *ctrl_state, struct pcc_state *pcc_state)
+{
+	assert(ctrl_state != NULL);
+	assert(pcep_pcc_get_pcc_id(pcc_state) != 0);
+
+	int current_pcc_idx = pcep_pcc_get_free_pcc_idx(ctrl_state->pcc);
+	if (current_pcc_idx >= 0) {
+		ctrl_state->pcc[current_pcc_idx] = pcc_state;
+		ctrl_state->pcc_count++;
+		PCEP_DEBUG("added pce pcc_id (%d) idx (%d)",
+			   pcep_pcc_get_pcc_id(pcc_state), current_pcc_idx);
+		return 0;
+	} else {
+		PCEP_DEBUG("Max number of pce ");
+		return 1;
+	}
+}
+
+void remove_pcc_state(struct ctrl_state *ctrl_state,
+		      struct pcc_state *pcc_state)
+{
+	assert(ctrl_state != NULL);
+	assert(pcep_pcc_get_pcc_id(pcc_state) != 0);
+
+	int idx = 0;
+	idx = pcep_pcc_get_pcc_idx_by_id(ctrl_state->pcc,
+					 pcep_pcc_get_pcc_id(pcc_state));
+	if (idx != -1) {
+		ctrl_state->pcc[idx] = NULL;
+		ctrl_state->pcc_count--;
+		PCEP_DEBUG("removed pce pcc_id (%d)",
+			   pcep_pcc_get_pcc_id(pcc_state));
+	}
+}
+
+uint32_t backoff_delay(uint32_t max, uint32_t base, uint32_t retry_count)
+{
+	uint32_t a = MIN(max, base * (1 << retry_count));
+	uint64_t r = frr_weak_random(), m = RAND_MAX;
+	uint32_t b = (a / 2) + (r * (a / 2)) / m;
+	return b;
+}
+
+const char *timer_type_name(enum pcep_ctrl_timer_type type)
+{
+	switch (type) {
+	case TM_UNDEFINED:
+		return "UNDEFINED";
+	case TM_RECONNECT_PCC:
+		return "RECONNECT_PCC";
+	case TM_PCEPLIB_TIMER:
+		return "PCEPLIB_TIMER";
+	case TM_TIMEOUT:
+		return "TIMEOUT";
+	default:
+		return "UNKNOWN";
+	}
+};
+
+const char *timeout_type_name(enum pcep_ctrl_timeout_type type)
+{
+	switch (type) {
+	case TO_UNDEFINED:
+		return "UNDEFINED";
+	case TO_COMPUTATION_REQUEST:
+		return "COMPUTATION_REQUEST";
+	default:
+		return "UNKNOWN";
+	}
+}