Adding upstream version 9.1.upstream/9.1

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

1 files changed, 1494 insertions, 0 deletions

diff --git a/lib/northbound_confd.c b/lib/northbound_confd.c
new file mode 100644
index 0000000..34406a1
--- /dev/null
+++ b/lib/northbound_confd.c
@@ -0,0 +1,1494 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2018  NetDEF, Inc.
+ *                     Renato Westphal
+ */
+
+#include <zebra.h>
+
+#include "log.h"
+#include "lib_errors.h"
+#include "command.h"
+#include "debug.h"
+#include "libfrr.h"
+#include "lib/version.h"
+#include "northbound.h"
+
+#include <confd_lib.h>
+#include <confd_cdb.h>
+#include <confd_dp.h>
+#include <confd_maapi.h>
+
+DEFINE_MTYPE_STATIC(LIB, CONFD, "ConfD module");
+
+static struct debug nb_dbg_client_confd = {0, "Northbound client: ConfD"};
+
+static struct event_loop *master;
+static struct sockaddr confd_addr;
+static int cdb_sub_sock, dp_ctl_sock, dp_worker_sock;
+static struct event *t_cdb_sub, *t_dp_ctl, *t_dp_worker;
+static struct confd_daemon_ctx *dctx;
+static struct confd_notification_ctx *live_ctx;
+static bool confd_connected;
+static struct list *confd_spoints;
+static struct nb_transaction *transaction;
+
+static void frr_confd_finish_cdb(void);
+static void frr_confd_finish_dp(void);
+static int frr_confd_finish(void);
+
+#define flog_err_confd(funcname)                                               \
+	flog_err(EC_LIB_LIBCONFD, "%s: %s() failed: %s (%d): %s", __func__,    \
+		 (funcname), confd_strerror(confd_errno), confd_errno,         \
+		 confd_lasterr())
+
+
+/* ------------ Utils ------------ */
+
+/* Get XPath string from ConfD hashed keypath. */
+static void frr_confd_get_xpath(const confd_hkeypath_t *kp, char *xpath,
+				size_t len)
+{
+	char *p;
+
+	confd_xpath_pp_kpath(xpath, len, 0, kp);
+
+	/*
+	 * Replace double quotes by single quotes (the format accepted by the
+	 * northbound API).
+	 */
+	p = xpath;
+	while ((p = strchr(p, '"')) != NULL)
+		*p++ = '\'';
+}
+
+/* Convert ConfD binary value to a string. */
+static int frr_confd_val2str(const char *xpath, const confd_value_t *value,
+			     char *string, size_t string_size)
+{
+	struct confd_cs_node *csp;
+
+	csp = confd_cs_node_cd(NULL, xpath);
+	if (!csp) {
+		flog_err_confd("confd_cs_node_cd");
+		return -1;
+	}
+	if (confd_val2str(csp->info.type, value, string, string_size)
+	    == CONFD_ERR) {
+		flog_err_confd("confd_val2str");
+		return -1;
+	}
+
+	return 0;
+}
+
+/* Obtain list entry from ConfD hashed keypath. */
+static int frr_confd_hkeypath_get_list_entry(const confd_hkeypath_t *kp,
+					     struct nb_node *nb_node,
+					     const void **list_entry)
+{
+	struct nb_node *nb_node_list;
+	int parent_lists = 0;
+	int curr_list = 0;
+
+	*list_entry = NULL;
+
+	/*
+	 * Count the number of YANG lists in the path, disconsidering the
+	 * last element.
+	 */
+	nb_node_list = nb_node;
+	while (nb_node_list->parent_list) {
+		nb_node_list = nb_node_list->parent_list;
+		parent_lists++;
+	}
+	if (nb_node->snode->nodetype != LYS_LIST && parent_lists == 0)
+		return 0;
+
+	/* Start from the beginning and move down the tree. */
+	for (int i = kp->len; i >= 0; i--) {
+		struct yang_list_keys keys;
+
+		/* Not a YANG list. */
+		if (kp->v[i][0].type != C_BUF)
+			continue;
+
+		/* Obtain list keys. */
+		memset(&keys, 0, sizeof(keys));
+		for (int j = 0; kp->v[i][j].type != C_NOEXISTS; j++) {
+			strlcpy(keys.key[keys.num],
+				(char *)kp->v[i][j].val.buf.ptr,
+				sizeof(keys.key[keys.num]));
+			keys.num++;
+		}
+
+		/* Obtain northbound node associated to the YANG list. */
+		nb_node_list = nb_node;
+		for (int j = curr_list; j < parent_lists; j++)
+			nb_node_list = nb_node_list->parent_list;
+
+		/* Obtain list entry. */
+		if (!CHECK_FLAG(nb_node_list->flags, F_NB_NODE_KEYLESS_LIST)) {
+			*list_entry = nb_callback_lookup_entry(
+				nb_node, *list_entry, &keys);
+			if (*list_entry == NULL)
+				return -1;
+		} else {
+			unsigned long ptr_ulong;
+
+			/* Retrieve list entry from pseudo-key (string). */
+			if (sscanf(keys.key[0], "%lu", &ptr_ulong) != 1)
+				return -1;
+			*list_entry = (const void *)ptr_ulong;
+		}
+
+		curr_list++;
+	}
+
+	return 0;
+}
+
+/* Fill the current date and time into a confd_datetime structure. */
+static void getdatetime(struct confd_datetime *datetime)
+{
+	struct tm tm;
+	struct timeval tv;
+
+	gettimeofday(&tv, NULL);
+	gmtime_r(&tv.tv_sec, &tm);
+
+	memset(datetime, 0, sizeof(*datetime));
+	datetime->year = 1900 + tm.tm_year;
+	datetime->month = tm.tm_mon + 1;
+	datetime->day = tm.tm_mday;
+	datetime->sec = tm.tm_sec;
+	datetime->micro = tv.tv_usec;
+	datetime->timezone = 0;
+	datetime->timezone_minutes = 0;
+	datetime->hour = tm.tm_hour;
+	datetime->min = tm.tm_min;
+}
+
+/* ------------ CDB code ------------ */
+
+struct cdb_iter_args {
+	struct nb_config *candidate;
+	bool error;
+};
+
+static enum cdb_iter_ret
+frr_confd_cdb_diff_iter(confd_hkeypath_t *kp, enum cdb_iter_op cdb_op,
+			confd_value_t *oldv, confd_value_t *newv, void *args)
+{
+	char xpath[XPATH_MAXLEN];
+	struct nb_node *nb_node;
+	enum nb_operation nb_op;
+	struct cdb_iter_args *iter_args = args;
+	char value_str[YANG_VALUE_MAXLEN];
+	struct yang_data *data;
+	char *sb1, *sb2;
+	int ret;
+
+	frr_confd_get_xpath(kp, xpath, sizeof(xpath));
+
+	/*
+	 * HACK: obtain value of leaf-list elements from the XPath due to
+	 * a bug in the ConfD API.
+	 */
+	value_str[0] = '\0';
+	sb1 = strrchr(xpath, '[');
+	sb2 = strrchr(xpath, ']');
+	if (sb1 && sb2 && !strchr(sb1, '=')) {
+		*sb2 = '\0';
+		strlcpy(value_str, sb1 + 1, sizeof(value_str));
+		*sb1 = '\0';
+	}
+
+	nb_node = nb_node_find(xpath);
+	if (!nb_node) {
+		flog_warn(EC_LIB_YANG_UNKNOWN_DATA_PATH,
+			  "%s: unknown data path: %s", __func__, xpath);
+		iter_args->error = true;
+		return ITER_STOP;
+	}
+
+	/* Map operation values. */
+	switch (cdb_op) {
+	case MOP_CREATED:
+		nb_op = NB_OP_CREATE;
+		break;
+	case MOP_DELETED:
+		nb_op = NB_OP_DESTROY;
+		break;
+	case MOP_VALUE_SET:
+		if (nb_operation_is_valid(NB_OP_MODIFY, nb_node->snode))
+			nb_op = NB_OP_MODIFY;
+		else
+			/* Ignore list keys modifications. */
+			return ITER_RECURSE;
+		break;
+	case MOP_MOVED_AFTER:
+		nb_op = NB_OP_MOVE;
+		break;
+	case MOP_MODIFIED:
+		/* We're not interested on this. */
+		return ITER_RECURSE;
+	default:
+		flog_err(EC_LIB_DEVELOPMENT,
+			 "%s: unexpected operation %u [xpath %s]", __func__,
+			 cdb_op, xpath);
+		iter_args->error = true;
+		return ITER_STOP;
+	}
+
+	/* Convert ConfD value to a string. */
+	if (nb_node->snode->nodetype != LYS_LEAFLIST && newv
+	    && frr_confd_val2str(nb_node->xpath, newv, value_str,
+				 sizeof(value_str))
+		       != 0) {
+		flog_err(EC_LIB_CONFD_DATA_CONVERT,
+			 "%s: failed to convert ConfD value to a string",
+			 __func__);
+		iter_args->error = true;
+		return ITER_STOP;
+	}
+
+	/* Edit the candidate configuration. */
+	data = yang_data_new(xpath, value_str);
+	ret = nb_candidate_edit(iter_args->candidate, nb_node, nb_op, xpath,
+				NULL, data);
+	yang_data_free(data);
+	if (ret != NB_OK) {
+		flog_warn(
+			EC_LIB_NB_CANDIDATE_EDIT_ERROR,
+			"%s: failed to edit candidate configuration: operation [%s] xpath [%s]",
+			__func__, nb_operation_name(nb_op), xpath);
+		iter_args->error = true;
+		return ITER_STOP;
+	}
+
+	return ITER_RECURSE;
+}
+
+static void frr_confd_cdb_read_cb_prepare(int fd, int *subp, int reslen)
+{
+	struct nb_context context = {};
+	struct nb_config *candidate;
+	struct cdb_iter_args iter_args;
+	char errmsg[BUFSIZ] = {0};
+	int ret;
+
+	candidate = nb_config_dup(running_config);
+
+	/* Iterate over all configuration changes. */
+	iter_args.candidate = candidate;
+	iter_args.error = false;
+	for (int i = 0; i < reslen; i++) {
+		if (cdb_diff_iterate(fd, subp[i], frr_confd_cdb_diff_iter,
+				     ITER_WANT_PREV, &iter_args)
+		    != CONFD_OK) {
+			flog_err_confd("cdb_diff_iterate");
+		}
+	}
+	free(subp);
+
+	if (iter_args.error) {
+		nb_config_free(candidate);
+
+		if (cdb_sub_abort_trans(
+			    cdb_sub_sock, CONFD_ERRCODE_APPLICATION_INTERNAL, 0,
+			    0, "Couldn't apply configuration changes")
+		    != CONFD_OK) {
+			flog_err_confd("cdb_sub_abort_trans");
+			return;
+		}
+		return;
+	}
+
+	/*
+	 * Validate the configuration changes and allocate all resources
+	 * required to apply them.
+	 */
+	transaction = NULL;
+	context.client = NB_CLIENT_CONFD;
+	ret = nb_candidate_commit_prepare(context, candidate, NULL,
+					  &transaction, false, false, errmsg,
+					  sizeof(errmsg));
+	if (ret != NB_OK && ret != NB_ERR_NO_CHANGES) {
+		enum confd_errcode errcode;
+
+		switch (ret) {
+		case NB_ERR_LOCKED:
+			errcode = CONFD_ERRCODE_IN_USE;
+			break;
+		case NB_ERR_RESOURCE:
+			errcode = CONFD_ERRCODE_RESOURCE_DENIED;
+			break;
+		default:
+			errcode = CONFD_ERRCODE_APPLICATION;
+			break;
+		}
+
+		/* Reject the configuration changes. */
+		if (cdb_sub_abort_trans(cdb_sub_sock, errcode, 0, 0, "%s",
+					errmsg)
+		    != CONFD_OK) {
+			flog_err_confd("cdb_sub_abort_trans");
+			return;
+		}
+	} else {
+		/* Acknowledge the notification. */
+		if (cdb_sync_subscription_socket(fd, CDB_DONE_PRIORITY)
+		    != CONFD_OK) {
+			flog_err_confd("cdb_sync_subscription_socket");
+			return;
+		}
+
+		/* No configuration changes. */
+		if (!transaction)
+			nb_config_free(candidate);
+	}
+}
+
+static void frr_confd_cdb_read_cb_commit(int fd, int *subp, int reslen)
+{
+	/*
+	 * No need to process the configuration changes again as we're already
+	 * keeping track of them in the "transaction" variable.
+	 */
+	free(subp);
+
+	/* Apply the transaction. */
+	if (transaction) {
+		struct nb_config *candidate = transaction->config;
+		char errmsg[BUFSIZ] = {0};
+
+		nb_candidate_commit_apply(transaction, true, NULL, errmsg,
+					  sizeof(errmsg));
+		nb_config_free(candidate);
+	}
+
+	/* Acknowledge the notification. */
+	if (cdb_sync_subscription_socket(fd, CDB_DONE_PRIORITY) != CONFD_OK) {
+		flog_err_confd("cdb_sync_subscription_socket");
+		return;
+	}
+}
+
+static int frr_confd_cdb_read_cb_abort(int fd, int *subp, int reslen)
+{
+	/*
+	 * No need to process the configuration changes again as we're already
+	 * keeping track of them in the "transaction" variable.
+	 */
+	free(subp);
+
+	/* Abort the transaction. */
+	if (transaction) {
+		struct nb_config *candidate = transaction->config;
+		char errmsg[BUFSIZ] = {0};
+
+		nb_candidate_commit_abort(transaction, errmsg, sizeof(errmsg));
+		nb_config_free(candidate);
+	}
+
+	/* Acknowledge the notification. */
+	if (cdb_sync_subscription_socket(fd, CDB_DONE_PRIORITY) != CONFD_OK) {
+		flog_err_confd("cdb_sync_subscription_socket");
+		return -1;
+	}
+
+	return 0;
+}
+
+static void frr_confd_cdb_read_cb(struct event *thread)
+{
+	int fd = EVENT_FD(thread);
+	enum cdb_sub_notification cdb_ev;
+	int flags;
+	int *subp = NULL;
+	int reslen = 0;
+
+	event_add_read(master, frr_confd_cdb_read_cb, NULL, fd, &t_cdb_sub);
+
+	if (cdb_read_subscription_socket2(fd, &cdb_ev, &flags, &subp, &reslen)
+	    != CONFD_OK) {
+		flog_err_confd("cdb_read_subscription_socket2");
+		return;
+	}
+
+	switch (cdb_ev) {
+	case CDB_SUB_PREPARE:
+		frr_confd_cdb_read_cb_prepare(fd, subp, reslen);
+		break;
+	case CDB_SUB_COMMIT:
+		frr_confd_cdb_read_cb_commit(fd, subp, reslen);
+		break;
+	case CDB_SUB_ABORT:
+		frr_confd_cdb_read_cb_abort(fd, subp, reslen);
+		break;
+	default:
+		flog_err_confd("unknown CDB event");
+		break;
+	}
+}
+
+/* Trigger CDB subscriptions to read the startup configuration. */
+static void *thread_cdb_trigger_subscriptions(void *data)
+{
+	int sock;
+	int *sub_points = NULL, len = 0;
+	struct listnode *node;
+	int *spoint;
+	int i = 0;
+
+	/* Create CDB data socket. */
+	sock = socket(PF_INET, SOCK_STREAM, 0);
+	if (sock < 0) {
+		flog_err(EC_LIB_SOCKET, "%s: failed to create socket: %s",
+			 __func__, safe_strerror(errno));
+		return NULL;
+	}
+
+	if (cdb_connect(sock, CDB_DATA_SOCKET, &confd_addr,
+			sizeof(struct sockaddr_in))
+	    != CONFD_OK) {
+		flog_err_confd("cdb_connect");
+		return NULL;
+	}
+
+	/*
+	 * Fill array containing the subscription point of all loaded YANG
+	 * modules.
+	 */
+	len = listcount(confd_spoints);
+	sub_points = XCALLOC(MTYPE_CONFD, len * sizeof(int));
+	for (ALL_LIST_ELEMENTS_RO(confd_spoints, node, spoint))
+		sub_points[i++] = *spoint;
+
+	if (cdb_trigger_subscriptions(sock, sub_points, len) != CONFD_OK) {
+		flog_err_confd("cdb_trigger_subscriptions");
+		return NULL;
+	}
+
+	/* Cleanup and exit thread. */
+	XFREE(MTYPE_CONFD, sub_points);
+	cdb_close(sock);
+
+	return NULL;
+}
+
+static int frr_confd_subscribe(const struct lysc_node *snode, void *arg)
+{
+	struct yang_module *module = arg;
+	struct nb_node *nb_node;
+	int *spoint;
+	int ret;
+
+	switch (snode->nodetype) {
+	case LYS_CONTAINER:
+	case LYS_LEAF:
+	case LYS_LEAFLIST:
+	case LYS_LIST:
+		break;
+	default:
+		return YANG_ITER_CONTINUE;
+	}
+
+	if (CHECK_FLAG(snode->flags, LYS_CONFIG_R))
+		return YANG_ITER_CONTINUE;
+
+	nb_node = snode->priv;
+	if (!nb_node)
+		return YANG_ITER_CONTINUE;
+
+	DEBUGD(&nb_dbg_client_confd, "%s: subscribing to '%s'", __func__,
+	       nb_node->xpath);
+
+	spoint = XMALLOC(MTYPE_CONFD, sizeof(*spoint));
+	ret = cdb_subscribe2(cdb_sub_sock, CDB_SUB_RUNNING_TWOPHASE,
+			     CDB_SUB_WANT_ABORT_ON_ABORT, 3, spoint,
+			     module->confd_hash, nb_node->xpath);
+	if (ret != CONFD_OK) {
+		flog_err_confd("cdb_subscribe2");
+		XFREE(MTYPE_CONFD, spoint);
+		return YANG_ITER_CONTINUE;
+	}
+
+	listnode_add(confd_spoints, spoint);
+	return YANG_ITER_CONTINUE;
+}
+
+static int frr_confd_init_cdb(void)
+{
+	struct yang_module *module;
+	pthread_t cdb_trigger_thread;
+
+	/* Create CDB subscription socket. */
+	cdb_sub_sock = socket(PF_INET, SOCK_STREAM, 0);
+	if (cdb_sub_sock < 0) {
+		flog_err(EC_LIB_SOCKET, "%s: failed to create socket: %s",
+			 __func__, safe_strerror(errno));
+		return -1;
+	}
+
+	if (cdb_connect(cdb_sub_sock, CDB_SUBSCRIPTION_SOCKET, &confd_addr,
+			sizeof(struct sockaddr_in))
+	    != CONFD_OK) {
+		flog_err_confd("cdb_connect");
+		goto error;
+	}
+
+	/* Subscribe to all loaded YANG data modules. */
+	confd_spoints = list_new();
+	RB_FOREACH (module, yang_modules, &yang_modules) {
+		module->confd_hash = confd_str2hash(module->info->ns);
+		if (module->confd_hash == 0) {
+			flog_err(
+				EC_LIB_LIBCONFD,
+				"%s: failed to find hash value for namespace %s",
+				__func__, module->info->ns);
+			goto error;
+		}
+
+		/*
+		 * The CDB API doesn't provide a mechanism to subscribe to an
+		 * entire YANG module. So we have to find the top level
+		 * nodes ourselves and subscribe to their paths.
+		 */
+		yang_snodes_iterate(module->info, frr_confd_subscribe, 0,
+				    module);
+	}
+
+	if (cdb_subscribe_done(cdb_sub_sock) != CONFD_OK) {
+		flog_err_confd("cdb_subscribe_done");
+		goto error;
+	}
+
+	/* Create short lived pthread to trigger the CDB subscriptions. */
+	if (pthread_create(&cdb_trigger_thread, NULL,
+			   thread_cdb_trigger_subscriptions, NULL)) {
+		flog_err(EC_LIB_SYSTEM_CALL, "%s: error creating pthread: %s",
+			 __func__, safe_strerror(errno));
+		goto error;
+	}
+	pthread_detach(cdb_trigger_thread);
+
+	event_add_read(master, frr_confd_cdb_read_cb, NULL, cdb_sub_sock,
+		       &t_cdb_sub);
+
+	return 0;
+
+error:
+	frr_confd_finish_cdb();
+
+	return -1;
+}
+
+static void frr_confd_finish_cdb(void)
+{
+	if (cdb_sub_sock > 0) {
+		EVENT_OFF(t_cdb_sub);
+		cdb_close(cdb_sub_sock);
+	}
+}
+
+/* ------------ DP code ------------ */
+
+static int frr_confd_transaction_init(struct confd_trans_ctx *tctx)
+{
+	confd_trans_set_fd(tctx, dp_worker_sock);
+
+	return CONFD_OK;
+}
+
+#define CONFD_MAX_CHILD_NODES 32
+
+static int frr_confd_data_get_elem(struct confd_trans_ctx *tctx,
+				   confd_hkeypath_t *kp)
+{
+	struct nb_node *nb_node;
+	char xpath[XPATH_MAXLEN];
+	struct yang_data *data;
+	confd_value_t v;
+	const void *list_entry = NULL;
+
+	frr_confd_get_xpath(kp, xpath, sizeof(xpath));
+
+	nb_node = nb_node_find(xpath);
+	if (!nb_node) {
+		flog_warn(EC_LIB_YANG_UNKNOWN_DATA_PATH,
+			  "%s: unknown data path: %s", __func__, xpath);
+		confd_data_reply_not_found(tctx);
+		return CONFD_OK;
+	}
+
+	if (frr_confd_hkeypath_get_list_entry(kp, nb_node, &list_entry) != 0) {
+		confd_data_reply_not_found(tctx);
+		return CONFD_OK;
+	}
+
+	data = nb_callback_get_elem(nb_node, xpath, list_entry);
+	if (data) {
+		if (data->value) {
+			CONFD_SET_STR(&v, data->value);
+			confd_data_reply_value(tctx, &v);
+		} else
+			confd_data_reply_found(tctx);
+		yang_data_free(data);
+	} else
+		confd_data_reply_not_found(tctx);
+
+	return CONFD_OK;
+}
+
+static int frr_confd_data_get_next(struct confd_trans_ctx *tctx,
+				   confd_hkeypath_t *kp, long next)
+{
+	struct nb_node *nb_node;
+	char xpath[XPATH_MAXLEN];
+	struct yang_data *data;
+	const void *parent_list_entry, *nb_next;
+	confd_value_t v[LIST_MAXKEYS];
+
+	frr_confd_get_xpath(kp, xpath, sizeof(xpath));
+
+	nb_node = nb_node_find(xpath);
+	if (!nb_node) {
+		flog_warn(EC_LIB_YANG_UNKNOWN_DATA_PATH,
+			  "%s: unknown data path: %s", __func__, xpath);
+		confd_data_reply_next_key(tctx, NULL, -1, -1);
+		return CONFD_OK;
+	}
+
+	if (frr_confd_hkeypath_get_list_entry(kp, nb_node, &parent_list_entry)
+	    != 0) {
+		/* List entry doesn't exist anymore. */
+		confd_data_reply_next_key(tctx, NULL, -1, -1);
+		return CONFD_OK;
+	}
+
+	nb_next = nb_callback_get_next(nb_node, parent_list_entry,
+				       (next == -1) ? NULL : (void *)next);
+	if (!nb_next) {
+		/* End of the list or leaf-list. */
+		confd_data_reply_next_key(tctx, NULL, -1, -1);
+		return CONFD_OK;
+	}
+
+	switch (nb_node->snode->nodetype) {
+	case LYS_LIST:
+		if (!CHECK_FLAG(nb_node->flags, F_NB_NODE_KEYLESS_LIST)) {
+			struct yang_list_keys keys;
+
+			memset(&keys, 0, sizeof(keys));
+			if (nb_callback_get_keys(nb_node, nb_next, &keys)
+			    != NB_OK) {
+				flog_warn(EC_LIB_NB_CB_STATE,
+					  "%s: failed to get list keys",
+					  __func__);
+				confd_data_reply_next_key(tctx, NULL, -1, -1);
+				return CONFD_OK;
+			}
+
+			/* Feed keys to ConfD. */
+			for (size_t i = 0; i < keys.num; i++)
+				CONFD_SET_STR(&v[i], keys.key[i]);
+			confd_data_reply_next_key(tctx, v, keys.num,
+						  (long)nb_next);
+		} else {
+			char pointer_str[32];
+
+			/*
+			 * ConfD 6.6 user guide, chapter 6.11 (Operational data
+			 * lists without keys):
+			 * "To support this without having completely separate
+			 * APIs, we use a "pseudo" key in the ConfD APIs for
+			 * this type of list. This key is not part of the data
+			 * model, and completely hidden in the northbound agent
+			 * interfaces, but is used with e.g. the get_next() and
+			 * get_elem() callbacks as if it were a normal key. This
+			 * "pseudo" key is always a single signed 64-bit
+			 * integer, i.e. the confd_value_t type is C_INT64. The
+			 * values can be chosen arbitrarily by the application,
+			 * as long as a key value returned by get_next() can be
+			 * used to get the data for the corresponding list entry
+			 * with get_elem() or get_object() as usual. It could
+			 * e.g. be an index into an array that holds the data,
+			 * or even a memory address in integer form".
+			 *
+			 * Since we're using the CONFD_DAEMON_FLAG_STRINGSONLY
+			 * option, we must convert our pseudo-key (a void
+			 * pointer) to a string before sending it to confd.
+			 */
+			snprintf(pointer_str, sizeof(pointer_str), "%lu",
+				 (unsigned long)nb_next);
+			CONFD_SET_STR(&v[0], pointer_str);
+			confd_data_reply_next_key(tctx, v, 1, (long)nb_next);
+		}
+		break;
+	case LYS_LEAFLIST:
+		data = nb_callback_get_elem(nb_node, xpath, nb_next);
+		if (data) {
+			if (data->value) {
+				CONFD_SET_STR(&v[0], data->value);
+				confd_data_reply_next_key(tctx, v, 1,
+							  (long)nb_next);
+			}
+			yang_data_free(data);
+		} else
+			confd_data_reply_next_key(tctx, NULL, -1, -1);
+		break;
+	default:
+		break;
+	}
+
+	return CONFD_OK;
+}
+
+/*
+ * Optional callback - implemented for performance reasons.
+ */
+static int frr_confd_data_get_object(struct confd_trans_ctx *tctx,
+				     confd_hkeypath_t *kp)
+{
+	struct nb_node *nb_node;
+	const struct lysc_node *child;
+	char xpath[XPATH_MAXLEN];
+	char xpath_child[XPATH_MAXLEN * 2];
+	struct list *elements;
+	struct yang_data *data;
+	const void *list_entry;
+	confd_value_t values[CONFD_MAX_CHILD_NODES];
+	size_t nvalues = 0;
+
+	frr_confd_get_xpath(kp, xpath, sizeof(xpath));
+
+	nb_node = nb_node_find(xpath);
+	if (!nb_node) {
+		flog_warn(EC_LIB_YANG_UNKNOWN_DATA_PATH,
+			  "%s: unknown data path: %s", __func__, xpath);
+		confd_data_reply_not_found(tctx);
+		return CONFD_ERR;
+	}
+
+	if (frr_confd_hkeypath_get_list_entry(kp, nb_node, &list_entry) != 0) {
+		confd_data_reply_not_found(tctx);
+		return CONFD_OK;
+	}
+
+	elements = yang_data_list_new();
+
+	/* Loop through list child nodes. */
+	LY_LIST_FOR (lysc_node_child(nb_node->snode), child) {
+		struct nb_node *nb_node_child = child->priv;
+		confd_value_t *v;
+
+		if (nvalues > CONFD_MAX_CHILD_NODES)
+			break;
+
+		v = &values[nvalues++];
+
+		/* Non-presence containers, lists and leaf-lists. */
+		if (!nb_node_child->cbs.get_elem) {
+			CONFD_SET_NOEXISTS(v);
+			continue;
+		}
+
+		snprintf(xpath_child, sizeof(xpath_child), "%s/%s", xpath,
+			 child->name);
+		data = nb_callback_get_elem(nb_node_child, xpath_child,
+					    list_entry);
+		if (data) {
+			if (data->value)
+				CONFD_SET_STR(v, data->value);
+			else {
+				/* Presence containers and empty leafs. */
+				CONFD_SET_XMLTAG(
+					v, nb_node_child->confd_hash,
+					confd_str2hash(nb_node_child->snode
+							       ->module->ns));
+			}
+			listnode_add(elements, data);
+		} else
+			CONFD_SET_NOEXISTS(v);
+	}
+
+	confd_data_reply_value_array(tctx, values, nvalues);
+
+	/* Release memory. */
+	list_delete(&elements);
+
+	return CONFD_OK;
+}
+
+/*
+ * Optional callback - implemented for performance reasons.
+ */
+static int frr_confd_data_get_next_object(struct confd_trans_ctx *tctx,
+					  confd_hkeypath_t *kp, long next)
+{
+	char xpath[XPATH_MAXLEN];
+	struct nb_node *nb_node;
+	struct list *elements;
+	const void *parent_list_entry;
+	const void *nb_next;
+#define CONFD_OBJECTS_PER_TIME 100
+	struct confd_next_object objects[CONFD_OBJECTS_PER_TIME + 1];
+	char pseudo_keys[CONFD_OBJECTS_PER_TIME][32];
+	int nobjects = 0;
+
+	frr_confd_get_xpath(kp, xpath, sizeof(xpath));
+
+	nb_node = nb_node_find(xpath);
+	if (!nb_node) {
+		flog_warn(EC_LIB_YANG_UNKNOWN_DATA_PATH,
+			  "%s: unknown data path: %s", __func__, xpath);
+		confd_data_reply_next_object_array(tctx, NULL, 0, 0);
+		return CONFD_OK;
+	}
+
+	if (frr_confd_hkeypath_get_list_entry(kp, nb_node, &parent_list_entry)
+	    != 0) {
+		confd_data_reply_next_object_array(tctx, NULL, 0, 0);
+		return CONFD_OK;
+	}
+
+	elements = yang_data_list_new();
+	nb_next = (next == -1) ? NULL : (void *)next;
+
+	memset(objects, 0, sizeof(objects));
+	for (int j = 0; j < CONFD_OBJECTS_PER_TIME; j++) {
+		struct confd_next_object *object;
+		const struct lysc_node *child;
+		struct yang_data *data;
+		size_t nvalues = 0;
+
+		object = &objects[j];
+
+		nb_next = nb_callback_get_next(nb_node, parent_list_entry,
+					       nb_next);
+		if (!nb_next)
+			/* End of the list. */
+			break;
+
+		object->next = (long)nb_next;
+
+		/* Leaf-lists require special handling. */
+		if (nb_node->snode->nodetype == LYS_LEAFLIST) {
+			object->v = XMALLOC(MTYPE_CONFD, sizeof(confd_value_t));
+			data = nb_callback_get_elem(nb_node, xpath, nb_next);
+			assert(data && data->value);
+			CONFD_SET_STR(object->v, data->value);
+			nvalues++;
+			listnode_add(elements, data);
+			goto next;
+		}
+
+		object->v =
+			XMALLOC(MTYPE_CONFD,
+				CONFD_MAX_CHILD_NODES * sizeof(confd_value_t));
+
+		/*
+		 * ConfD 6.6 user guide, chapter 6.11 (Operational data lists
+		 * without keys):
+		 * "In the response to the get_next_object() callback, the data
+		 * provider is expected to provide the key values along with the
+		 * other leafs in an array that is populated according to the
+		 * data model. This must be done also for this type of list,
+		 * even though the key isn't actually in the data model. The
+		 * "pseudo" key must always be the first element in the array".
+		 */
+		if (CHECK_FLAG(nb_node->flags, F_NB_NODE_KEYLESS_LIST)) {
+			confd_value_t *v;
+
+			snprintf(pseudo_keys[j], sizeof(pseudo_keys[j]), "%lu",
+				 (unsigned long)nb_next);
+
+			v = &object->v[nvalues++];
+			CONFD_SET_STR(v, pseudo_keys[j]);
+		}
+
+		/* Loop through list child nodes. */
+		LY_LIST_FOR (lysc_node_child(nb_node->snode), child) {
+			struct nb_node *nb_node_child = child->priv;
+			char xpath_child[XPATH_MAXLEN * 2];
+			confd_value_t *v;
+
+			if (nvalues > CONFD_MAX_CHILD_NODES)
+				break;
+
+			v = &object->v[nvalues++];
+
+			/* Non-presence containers, lists and leaf-lists. */
+			if (!nb_node_child->cbs.get_elem) {
+				CONFD_SET_NOEXISTS(v);
+				continue;
+			}
+
+			snprintf(xpath_child, sizeof(xpath_child), "%s/%s",
+				 xpath, child->name);
+			data = nb_callback_get_elem(nb_node_child, xpath_child,
+						    nb_next);
+			if (data) {
+				if (data->value)
+					CONFD_SET_STR(v, data->value);
+				else {
+					/*
+					 * Presence containers and empty leafs.
+					 */
+					CONFD_SET_XMLTAG(
+						v, nb_node_child->confd_hash,
+						confd_str2hash(
+							nb_node_child->snode
+								->module->ns));
+				}
+				listnode_add(elements, data);
+			} else
+				CONFD_SET_NOEXISTS(v);
+		}
+	next:
+		object->n = nvalues;
+		nobjects++;
+	}
+
+	if (nobjects == 0) {
+		confd_data_reply_next_object_array(tctx, NULL, 0, 0);
+		list_delete(&elements);
+		return CONFD_OK;
+	}
+
+	/* Detect end of the list. */
+	if (!nb_next) {
+		nobjects++;
+		objects[nobjects].v = NULL;
+	}
+
+	/* Reply to ConfD. */
+	confd_data_reply_next_object_arrays(tctx, objects, nobjects, 0);
+	if (!nb_next)
+		nobjects--;
+
+	/* Release memory. */
+	list_delete(&elements);
+	for (int j = 0; j < nobjects; j++) {
+		struct confd_next_object *object;
+
+		object = &objects[j];
+		XFREE(MTYPE_CONFD, object->v);
+	}
+
+	return CONFD_OK;
+}
+
+static int frr_confd_notification_send(const char *xpath,
+				       struct list *arguments)
+{
+	struct nb_node *nb_node;
+	struct yang_module *module;
+	struct confd_datetime now;
+	confd_tag_value_t *values;
+	int nvalues;
+	int i = 0;
+	struct yang_data *data;
+	struct listnode *node;
+	int ret;
+
+	nb_node = nb_node_find(xpath);
+	if (!nb_node) {
+		flog_warn(EC_LIB_YANG_UNKNOWN_DATA_PATH,
+			  "%s: unknown data path: %s", __func__, xpath);
+		return -1;
+	}
+	module = yang_module_find(nb_node->snode->module->name);
+	assert(module);
+
+	nvalues = 2;
+	if (arguments)
+		nvalues += listcount(arguments);
+
+	values = XMALLOC(MTYPE_CONFD, nvalues * sizeof(*values));
+
+	CONFD_SET_TAG_XMLBEGIN(&values[i++], nb_node->confd_hash,
+			       module->confd_hash);
+	for (ALL_LIST_ELEMENTS_RO(arguments, node, data)) {
+		struct nb_node *nb_node_arg;
+
+		nb_node_arg = nb_node_find(data->xpath);
+		if (!nb_node_arg) {
+			flog_warn(EC_LIB_YANG_UNKNOWN_DATA_PATH,
+				  "%s: unknown data path: %s", __func__,
+				  data->xpath);
+			XFREE(MTYPE_CONFD, values);
+			return NB_ERR;
+		}
+
+		CONFD_SET_TAG_STR(&values[i++], nb_node_arg->confd_hash,
+				  data->value);
+	}
+	CONFD_SET_TAG_XMLEND(&values[i++], nb_node->confd_hash,
+			     module->confd_hash);
+
+	getdatetime(&now);
+	ret = confd_notification_send(live_ctx, &now, values, nvalues);
+
+	/* Release memory. */
+	XFREE(MTYPE_CONFD, values);
+
+	/* Map ConfD return code to northbound return code. */
+	switch (ret) {
+	case CONFD_OK:
+		return NB_OK;
+	default:
+		return NB_ERR;
+	}
+}
+
+static int frr_confd_action_init(struct confd_user_info *uinfo)
+{
+	confd_action_set_fd(uinfo, dp_worker_sock);
+
+	return CONFD_OK;
+}
+
+static int frr_confd_action_execute(struct confd_user_info *uinfo,
+				    struct xml_tag *name, confd_hkeypath_t *kp,
+				    confd_tag_value_t *params, int nparams)
+{
+	char xpath[XPATH_MAXLEN];
+	struct nb_node *nb_node;
+	struct list *input;
+	struct list *output;
+	struct yang_data *data;
+	confd_tag_value_t *reply;
+	int ret = CONFD_OK;
+	char errmsg[BUFSIZ] = {0};
+
+	/* Getting the XPath is tricky. */
+	if (kp) {
+		/* This is a YANG RPC. */
+		frr_confd_get_xpath(kp, xpath, sizeof(xpath));
+		strlcat(xpath, "/", sizeof(xpath));
+		strlcat(xpath, confd_hash2str(name->tag), sizeof(xpath));
+	} else {
+		/* This is a YANG action. */
+		snprintf(xpath, sizeof(xpath), "/%s:%s",
+			 confd_ns2prefix(name->ns), confd_hash2str(name->tag));
+	}
+
+	nb_node = nb_node_find(xpath);
+	if (!nb_node) {
+		flog_warn(EC_LIB_YANG_UNKNOWN_DATA_PATH,
+			  "%s: unknown data path: %s", __func__, xpath);
+		return CONFD_ERR;
+	}
+
+	input = yang_data_list_new();
+	output = yang_data_list_new();
+
+	/* Process input nodes. */
+	for (int i = 0; i < nparams; i++) {
+		char xpath_input[XPATH_MAXLEN * 2];
+		char value_str[YANG_VALUE_MAXLEN];
+
+		snprintf(xpath_input, sizeof(xpath_input), "%s/%s", xpath,
+			 confd_hash2str(params[i].tag.tag));
+
+		if (frr_confd_val2str(xpath_input, &params[i].v, value_str,
+				      sizeof(value_str))
+		    != 0) {
+			flog_err(
+				EC_LIB_CONFD_DATA_CONVERT,
+				"%s: failed to convert ConfD value to a string",
+				__func__);
+			ret = CONFD_ERR;
+			goto exit;
+		}
+
+		data = yang_data_new(xpath_input, value_str);
+		listnode_add(input, data);
+	}
+
+	/* Execute callback registered for this XPath. */
+	if (nb_callback_rpc(nb_node, xpath, input, output, errmsg,
+			    sizeof(errmsg))
+	    != NB_OK) {
+		flog_warn(EC_LIB_NB_CB_RPC, "%s: rpc callback failed: %s",
+			  __func__, xpath);
+		ret = CONFD_ERR;
+		goto exit;
+	}
+
+	/* Process output nodes. */
+	if (listcount(output) > 0) {
+		struct listnode *node;
+		int i = 0;
+
+		reply = XMALLOC(MTYPE_CONFD,
+				listcount(output) * sizeof(*reply));
+
+		for (ALL_LIST_ELEMENTS_RO(output, node, data)) {
+			struct nb_node *nb_node_output;
+			int hash;
+
+			nb_node_output = nb_node_find(data->xpath);
+			if (!nb_node_output) {
+				flog_warn(EC_LIB_YANG_UNKNOWN_DATA_PATH,
+					  "%s: unknown data path: %s", __func__,
+					  data->xpath);
+				goto exit;
+			}
+
+			hash = confd_str2hash(nb_node_output->snode->name);
+			CONFD_SET_TAG_STR(&reply[i++], hash, data->value);
+		}
+		confd_action_reply_values(uinfo, reply, listcount(output));
+		XFREE(MTYPE_CONFD, reply);
+	}
+
+exit:
+	/* Release memory. */
+	list_delete(&input);
+	list_delete(&output);
+
+	return ret;
+}
+
+
+static int frr_confd_dp_read(struct confd_daemon_ctx *dctx, int fd)
+{
+	int ret;
+
+	ret = confd_fd_ready(dctx, fd);
+	if (ret == CONFD_EOF) {
+		flog_err_confd("confd_fd_ready");
+		frr_confd_finish();
+		return -1;
+	} else if (ret == CONFD_ERR && confd_errno != CONFD_ERR_EXTERNAL) {
+		flog_err_confd("confd_fd_ready");
+		frr_confd_finish();
+		return -1;
+	}
+
+	return 0;
+}
+
+static void frr_confd_dp_ctl_read(struct event *thread)
+{
+	struct confd_daemon_ctx *dctx = EVENT_ARG(thread);
+	int fd = EVENT_FD(thread);
+
+	event_add_read(master, frr_confd_dp_ctl_read, dctx, fd, &t_dp_ctl);
+
+	frr_confd_dp_read(dctx, fd);
+}
+
+static void frr_confd_dp_worker_read(struct event *thread)
+{
+	struct confd_daemon_ctx *dctx = EVENT_ARG(thread);
+	int fd = EVENT_FD(thread);
+
+	event_add_read(master, frr_confd_dp_worker_read, dctx, fd,
+		       &t_dp_worker);
+
+	frr_confd_dp_read(dctx, fd);
+}
+
+static int frr_confd_subscribe_state(const struct lysc_node *snode, void *arg)
+{
+	struct nb_node *nb_node = snode->priv;
+	struct confd_data_cbs *data_cbs = arg;
+
+	if (!nb_node || !CHECK_FLAG(snode->flags, LYS_CONFIG_R))
+		return YANG_ITER_CONTINUE;
+	/* We only need to subscribe to the root of the state subtrees. */
+	if (snode->parent && CHECK_FLAG(snode->parent->flags, LYS_CONFIG_R))
+		return YANG_ITER_CONTINUE;
+
+	DEBUGD(&nb_dbg_client_confd,
+	       "%s: providing data to '%s' (callpoint %s)", __func__,
+	       nb_node->xpath, snode->name);
+
+	strlcpy(data_cbs->callpoint, snode->name, sizeof(data_cbs->callpoint));
+	if (confd_register_data_cb(dctx, data_cbs) != CONFD_OK)
+		flog_err_confd("confd_register_data_cb");
+
+	return YANG_ITER_CONTINUE;
+}
+
+static int frr_confd_init_dp(const char *program_name)
+{
+	struct confd_trans_cbs trans_cbs;
+	struct confd_data_cbs data_cbs;
+	struct confd_notification_stream_cbs ncbs;
+	struct confd_action_cbs acbs;
+
+	/* Initialize daemon context. */
+	dctx = confd_init_daemon(program_name);
+	if (!dctx) {
+		flog_err_confd("confd_init_daemon");
+		goto error;
+	}
+
+	/*
+	 * Inform we want to receive YANG values as raw strings, and that we
+	 * want to provide only strings in the reply functions, regardless of
+	 * the YANG type.
+	 */
+	confd_set_daemon_flags(dctx, CONFD_DAEMON_FLAG_STRINGSONLY);
+
+	/* Establish a control socket. */
+	dp_ctl_sock = socket(PF_INET, SOCK_STREAM, 0);
+	if (dp_ctl_sock < 0) {
+		flog_err(EC_LIB_SOCKET, "%s: failed to create socket: %s",
+			 __func__, safe_strerror(errno));
+		goto error;
+	}
+
+	if (confd_connect(dctx, dp_ctl_sock, CONTROL_SOCKET, &confd_addr,
+			  sizeof(struct sockaddr_in))
+	    != CONFD_OK) {
+		flog_err_confd("confd_connect");
+		goto error;
+	}
+
+	/*
+	 * Establish a worker socket (only one since this plugin runs on a
+	 * single thread).
+	 */
+	dp_worker_sock = socket(PF_INET, SOCK_STREAM, 0);
+	if (dp_worker_sock < 0) {
+		flog_err(EC_LIB_SOCKET, "%s: failed to create socket: %s",
+			 __func__, safe_strerror(errno));
+		goto error;
+	}
+	if (confd_connect(dctx, dp_worker_sock, WORKER_SOCKET, &confd_addr,
+			  sizeof(struct sockaddr_in))
+	    != CONFD_OK) {
+		flog_err_confd("confd_connect");
+		goto error;
+	}
+
+	/* Register transaction callback functions. */
+	memset(&trans_cbs, 0, sizeof(trans_cbs));
+	trans_cbs.init = frr_confd_transaction_init;
+	confd_register_trans_cb(dctx, &trans_cbs);
+
+	/* Register our read/write callbacks. */
+	memset(&data_cbs, 0, sizeof(data_cbs));
+	data_cbs.get_elem = frr_confd_data_get_elem;
+	data_cbs.exists_optional = frr_confd_data_get_elem;
+	data_cbs.get_next = frr_confd_data_get_next;
+	data_cbs.get_object = frr_confd_data_get_object;
+	data_cbs.get_next_object = frr_confd_data_get_next_object;
+
+	/*
+	 * Iterate over all loaded YANG modules and subscribe to the paths
+	 * referent to state data.
+	 */
+	yang_snodes_iterate(NULL, frr_confd_subscribe_state, 0, &data_cbs);
+
+	/* Register notification stream. */
+	memset(&ncbs, 0, sizeof(ncbs));
+	ncbs.fd = dp_worker_sock;
+	/*
+	 * RFC 5277 - Section 3.2.3:
+	 * A NETCONF server implementation supporting the notification
+	 * capability MUST support the "NETCONF" notification event
+	 * stream. This stream contains all NETCONF XML event notifications
+	 * supported by the NETCONF server.
+	 */
+	strlcpy(ncbs.streamname, "NETCONF", sizeof(ncbs.streamname));
+	if (confd_register_notification_stream(dctx, &ncbs, &live_ctx)
+	    != CONFD_OK) {
+		flog_err_confd("confd_register_notification_stream");
+		goto error;
+	}
+
+	/* Register the action handler callback. */
+	memset(&acbs, 0, sizeof(acbs));
+	strlcpy(acbs.actionpoint, "actionpoint", sizeof(acbs.actionpoint));
+	acbs.init = frr_confd_action_init;
+	acbs.action = frr_confd_action_execute;
+	if (confd_register_action_cbs(dctx, &acbs) != CONFD_OK) {
+		flog_err_confd("confd_register_action_cbs");
+		goto error;
+	}
+
+	/* Notify we registered all callbacks we wanted. */
+	if (confd_register_done(dctx) != CONFD_OK) {
+		flog_err_confd("confd_register_done");
+		goto error;
+	}
+
+	event_add_read(master, frr_confd_dp_ctl_read, dctx, dp_ctl_sock,
+		       &t_dp_ctl);
+	event_add_read(master, frr_confd_dp_worker_read, dctx, dp_worker_sock,
+		       &t_dp_worker);
+
+	return 0;
+
+error:
+	frr_confd_finish_dp();
+
+	return -1;
+}
+
+static void frr_confd_finish_dp(void)
+{
+	if (dp_worker_sock > 0) {
+		EVENT_OFF(t_dp_worker);
+		close(dp_worker_sock);
+	}
+	if (dp_ctl_sock > 0) {
+		EVENT_OFF(t_dp_ctl);
+		close(dp_ctl_sock);
+	}
+	if (dctx != NULL)
+		confd_release_daemon(dctx);
+}
+
+/* ------------ CLI ------------ */
+
+DEFUN (debug_nb_confd,
+       debug_nb_confd_cmd,
+       "[no] debug northbound client confd",
+       NO_STR
+       DEBUG_STR
+       "Northbound debugging\n"
+       "Client\n"
+       "ConfD\n")
+{
+	uint32_t mode = DEBUG_NODE2MODE(vty->node);
+	bool no = strmatch(argv[0]->text, "no");
+
+	DEBUG_MODE_SET(&nb_dbg_client_confd, mode, !no);
+
+	return CMD_SUCCESS;
+}
+
+static int frr_confd_debug_config_write(struct vty *vty)
+{
+	if (DEBUG_MODE_CHECK(&nb_dbg_client_confd, DEBUG_MODE_CONF))
+		vty_out(vty, "debug northbound client confd\n");
+
+	return 0;
+}
+
+static int frr_confd_debug_set_all(uint32_t flags, bool set)
+{
+	DEBUG_FLAGS_SET(&nb_dbg_client_confd, flags, set);
+
+	/* If all modes have been turned off, don't preserve options. */
+	if (!DEBUG_MODE_CHECK(&nb_dbg_client_confd, DEBUG_MODE_ALL))
+		DEBUG_CLEAR(&nb_dbg_client_confd);
+
+	return 0;
+}
+
+static void frr_confd_cli_init(void)
+{
+	hook_register(nb_client_debug_config_write,
+		      frr_confd_debug_config_write);
+	hook_register(nb_client_debug_set_all, frr_confd_debug_set_all);
+
+	install_element(ENABLE_NODE, &debug_nb_confd_cmd);
+	install_element(CONFIG_NODE, &debug_nb_confd_cmd);
+}
+
+/* ------------ Main ------------ */
+
+static int frr_confd_calculate_snode_hash(const struct lysc_node *snode,
+					  void *arg)
+{
+	struct nb_node *nb_node = snode->priv;
+
+	if (nb_node)
+		nb_node->confd_hash = confd_str2hash(snode->name);
+
+	return YANG_ITER_CONTINUE;
+}
+
+static int frr_confd_init(const char *program_name)
+{
+	struct sockaddr_in *confd_addr4 = (struct sockaddr_in *)&confd_addr;
+	int debuglevel = CONFD_SILENT;
+	int ret = -1;
+
+	/* Initialize ConfD library. */
+	confd_init(program_name, stderr, debuglevel);
+
+	confd_addr4->sin_family = AF_INET;
+	confd_addr4->sin_addr.s_addr = inet_addr("127.0.0.1");
+	confd_addr4->sin_port = htons(CONFD_PORT);
+	if (confd_load_schemas(&confd_addr, sizeof(struct sockaddr_in))
+	    != CONFD_OK) {
+		flog_err_confd("confd_load_schemas");
+		return -1;
+	}
+
+	ret = frr_confd_init_cdb();
+	if (ret != 0)
+		goto error;
+
+	ret = frr_confd_init_dp(program_name);
+	if (ret != 0) {
+		frr_confd_finish_cdb();
+		goto error;
+	}
+
+	yang_snodes_iterate(NULL, frr_confd_calculate_snode_hash, 0, NULL);
+
+	hook_register(nb_notification_send, frr_confd_notification_send);
+
+	confd_connected = true;
+	return 0;
+
+error:
+	confd_free_schemas();
+
+	return ret;
+}
+
+static int frr_confd_finish(void)
+{
+	if (!confd_connected)
+		return 0;
+
+	frr_confd_finish_cdb();
+	frr_confd_finish_dp();
+
+	confd_free_schemas();
+
+	confd_connected = false;
+
+	return 0;
+}
+
+static int frr_confd_module_late_init(struct event_loop *tm)
+{
+	master = tm;
+
+	if (frr_confd_init(frr_get_progname()) < 0) {
+		flog_err(EC_LIB_CONFD_INIT,
+			 "failed to initialize the ConfD module");
+		return -1;
+	}
+
+	hook_register(frr_fini, frr_confd_finish);
+	frr_confd_cli_init();
+
+	return 0;
+}
+
+static int frr_confd_module_init(void)
+{
+	hook_register(frr_late_init, frr_confd_module_late_init);
+
+	return 0;
+}
+
+FRR_MODULE_SETUP(.name = "frr_confd", .version = FRR_VERSION,
+		 .description = "FRR ConfD integration module",
+		 .init = frr_confd_module_init,
+);