Adding upstream version 9.1.upstream/9.1

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

1 files changed, 1144 insertions, 0 deletions

diff --git a/lib/yang_wrappers.c b/lib/yang_wrappers.c
new file mode 100644
index 0000000..dc049a3
--- /dev/null
+++ b/lib/yang_wrappers.c
@@ -0,0 +1,1144 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2018  NetDEF, Inc.
+ *                     Renato Westphal
+ */
+
+#include <zebra.h>
+
+#include "base64.h"
+#include "log.h"
+#include "lib_errors.h"
+#include "northbound.h"
+#include "printfrr.h"
+#include "nexthop.h"
+#include "printfrr.h"
+
+
+#define YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt)                           \
+	({                                                                     \
+		va_list __ap;                                                  \
+		va_start(__ap, (xpath_fmt));                                   \
+		const struct lyd_value *__dvalue =                             \
+			yang_dnode_xpath_get_value(dnode, xpath_fmt, __ap);    \
+		va_end(__ap);                                                  \
+		__dvalue;                                                      \
+	})
+
+#define YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt)                           \
+	({                                                                     \
+		va_list __ap;                                                  \
+		va_start(__ap, (xpath_fmt));                                   \
+		const char *__canon =                                          \
+			yang_dnode_xpath_get_canon(dnode, xpath_fmt, __ap);    \
+		va_end(__ap);                                                  \
+		__canon;                                                       \
+	})
+
+#define YANG_DNODE_GET_ASSERT(dnode, xpath)                                    \
+	do {                                                                   \
+		if ((dnode) == NULL) {                                         \
+			flog_err(EC_LIB_YANG_DNODE_NOT_FOUND,                  \
+				 "%s: couldn't find %s", __func__, (xpath));   \
+			zlog_backtrace(LOG_ERR);                               \
+			abort();                                               \
+		}                                                              \
+	} while (0)
+
+PRINTFRR(2, 0)
+static inline const char *
+yang_dnode_xpath_get_canon(const struct lyd_node *dnode, const char *xpath_fmt,
+			   va_list ap)
+{
+	const struct lyd_node_term *__dleaf =
+		(const struct lyd_node_term *)dnode;
+	assert(__dleaf);
+	if (xpath_fmt) {
+		char __xpath[XPATH_MAXLEN];
+		vsnprintf(__xpath, sizeof(__xpath), xpath_fmt, ap);
+		__dleaf = (const struct lyd_node_term *)yang_dnode_get(dnode,
+								       __xpath);
+		YANG_DNODE_GET_ASSERT(__dleaf, __xpath);
+	}
+	return lyd_get_value(&__dleaf->node);
+}
+
+PRINTFRR(2, 0)
+static inline const struct lyd_value *
+yang_dnode_xpath_get_value(const struct lyd_node *dnode, const char *xpath_fmt,
+			   va_list ap)
+{
+	const struct lyd_node_term *__dleaf =
+		(const struct lyd_node_term *)dnode;
+	assert(__dleaf);
+	if (xpath_fmt) {
+		char __xpath[XPATH_MAXLEN];
+		vsnprintf(__xpath, sizeof(__xpath), xpath_fmt, ap);
+		__dleaf = (const struct lyd_node_term *)yang_dnode_get(dnode,
+								       __xpath);
+		YANG_DNODE_GET_ASSERT(__dleaf, __xpath);
+	}
+	const struct lyd_value *__dvalue = &__dleaf->value;
+	if (__dvalue->realtype->basetype == LY_TYPE_UNION)
+		__dvalue = &__dvalue->subvalue->value;
+	return __dvalue;
+}
+
+static const char *yang_get_default_value(const char *xpath)
+{
+	const struct lysc_node *snode;
+	const char *value;
+
+	snode = yang_find_snode(ly_native_ctx, xpath, 0);
+	if (snode == NULL) {
+		flog_err(EC_LIB_YANG_UNKNOWN_DATA_PATH,
+			 "%s: unknown data path: %s", __func__, xpath);
+		zlog_backtrace(LOG_ERR);
+		abort();
+	}
+
+	value = yang_snode_get_default(snode);
+	assert(value);
+
+	return value;
+}
+
+/*
+ * Primitive type: bool.
+ */
+bool yang_str2bool(const char *value)
+{
+	return strmatch(value, "true");
+}
+
+struct yang_data *yang_data_new_bool(const char *xpath, bool value)
+{
+	return yang_data_new(xpath, (value) ? "true" : "false");
+}
+
+bool yang_dnode_get_bool(const struct lyd_node *dnode, const char *xpath_fmt,
+			 ...)
+{
+	const struct lyd_value *dvalue;
+	dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
+	assert(dvalue->realtype->basetype == LY_TYPE_BOOL);
+	return dvalue->boolean;
+}
+
+bool yang_get_default_bool(const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	return yang_str2bool(value);
+}
+
+/*
+ * Primitive type: dec64.
+ */
+double yang_str2dec64(const char *xpath, const char *value)
+{
+	double dbl = 0;
+
+	if (sscanf(value, "%lf", &dbl) != 1) {
+		flog_err(EC_LIB_YANG_DATA_CONVERT,
+			 "%s: couldn't convert string to decimal64 [xpath %s]",
+			 __func__, xpath);
+		zlog_backtrace(LOG_ERR);
+		abort();
+	}
+
+	return dbl;
+}
+
+struct yang_data *yang_data_new_dec64(const char *xpath, double value)
+{
+	char value_str[BUFSIZ];
+
+	snprintf(value_str, sizeof(value_str), "%lf", value);
+	return yang_data_new(xpath, value_str);
+}
+
+double yang_dnode_get_dec64(const struct lyd_node *dnode, const char *xpath_fmt,
+			    ...)
+{
+	const double denom[19] = {1e0,   1e-1,  1e-2,  1e-3,  1e-4,
+				  1e-5,  1e-6,  1e-7,  1e-8,  1e-9,
+				  1e-10, 1e-11, 1e-12, 1e-13, 1e-14,
+				  1e-15, 1e-16, 1e-17, 1e-18};
+	const struct lysc_type_dec *dectype;
+	const struct lyd_value *dvalue;
+
+	dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
+	dectype = (const struct lysc_type_dec *)dvalue->realtype;
+	assert(dectype->basetype == LY_TYPE_DEC64);
+	assert(dectype->fraction_digits < sizeof(denom) / sizeof(*denom));
+	return (double)dvalue->dec64 * denom[dectype->fraction_digits];
+}
+
+double yang_get_default_dec64(const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	return yang_str2dec64(xpath, value);
+}
+
+/*
+ * Primitive type: enum.
+ */
+int yang_str2enum(const char *xpath, const char *value)
+{
+	const struct lysc_node *snode;
+	const struct lysc_node_leaf *sleaf;
+	const struct lysc_type_enum *type;
+	const struct lysc_type_bitenum_item *enums;
+
+	snode = yang_find_snode(ly_native_ctx, xpath, 0);
+	if (snode == NULL) {
+		flog_err(EC_LIB_YANG_UNKNOWN_DATA_PATH,
+			 "%s: unknown data path: %s", __func__, xpath);
+		zlog_backtrace(LOG_ERR);
+		abort();
+	}
+
+	assert(snode->nodetype == LYS_LEAF);
+	sleaf = (const struct lysc_node_leaf *)snode;
+	type = (const struct lysc_type_enum *)sleaf->type;
+	assert(type->basetype == LY_TYPE_ENUM);
+	enums = type->enums;
+	unsigned int count = LY_ARRAY_COUNT(enums);
+	for (unsigned int i = 0; i < count; i++) {
+		if (strmatch(value, enums[i].name)) {
+			assert(CHECK_FLAG(enums[i].flags, LYS_SET_VALUE));
+			return enums[i].value;
+		}
+	}
+
+	flog_err(EC_LIB_YANG_DATA_CONVERT,
+		 "%s: couldn't convert string to enum [xpath %s]", __func__,
+		 xpath);
+	zlog_backtrace(LOG_ERR);
+	abort();
+}
+
+struct yang_data *yang_data_new_enum(const char *xpath, int value)
+{
+	const struct lysc_node *snode;
+	const struct lysc_node_leaf *sleaf;
+	const struct lysc_type_enum *type;
+	const struct lysc_type_bitenum_item *enums;
+
+	snode = yang_find_snode(ly_native_ctx, xpath, 0);
+	if (snode == NULL) {
+		flog_err(EC_LIB_YANG_UNKNOWN_DATA_PATH,
+			 "%s: unknown data path: %s", __func__, xpath);
+		zlog_backtrace(LOG_ERR);
+		abort();
+	}
+
+	assert(snode->nodetype == LYS_LEAF);
+	sleaf = (const struct lysc_node_leaf *)snode;
+	type = (const struct lysc_type_enum *)sleaf->type;
+	assert(type->basetype == LY_TYPE_ENUM);
+	enums = type->enums;
+	unsigned int count = LY_ARRAY_COUNT(enums);
+	for (unsigned int i = 0; i < count; i++) {
+		if (CHECK_FLAG(enums[i].flags, LYS_SET_VALUE)
+		    && value == enums[i].value)
+			return yang_data_new(xpath, enums[i].name);
+	}
+
+	flog_err(EC_LIB_YANG_DATA_CONVERT,
+		 "%s: couldn't convert enum to string [xpath %s]", __func__,
+		 xpath);
+	zlog_backtrace(LOG_ERR);
+	abort();
+}
+
+int yang_dnode_get_enum(const struct lyd_node *dnode, const char *xpath_fmt,
+			...)
+{
+	const struct lyd_value *dvalue;
+
+	dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
+	assert(dvalue->realtype->basetype == LY_TYPE_ENUM);
+	assert(dvalue->enum_item->flags & LYS_SET_VALUE);
+	return dvalue->enum_item->value;
+}
+
+int yang_get_default_enum(const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	return yang_str2enum(xpath, value);
+}
+
+/*
+ * Primitive type: int8.
+ */
+int8_t yang_str2int8(const char *value)
+{
+	return strtol(value, NULL, 10);
+}
+
+struct yang_data *yang_data_new_int8(const char *xpath, int8_t value)
+{
+	char value_str[BUFSIZ];
+
+	snprintf(value_str, sizeof(value_str), "%d", value);
+	return yang_data_new(xpath, value_str);
+}
+
+int8_t yang_dnode_get_int8(const struct lyd_node *dnode, const char *xpath_fmt,
+			   ...)
+{
+	const struct lyd_value *dvalue;
+	dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
+	assert(dvalue->realtype->basetype == LY_TYPE_INT8);
+	return dvalue->int8;
+}
+
+int8_t yang_get_default_int8(const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	return yang_str2int8(value);
+}
+
+/*
+ * Primitive type: int16.
+ */
+int16_t yang_str2int16(const char *value)
+{
+	return strtol(value, NULL, 10);
+}
+
+struct yang_data *yang_data_new_int16(const char *xpath, int16_t value)
+{
+	char value_str[BUFSIZ];
+
+	snprintf(value_str, sizeof(value_str), "%d", value);
+	return yang_data_new(xpath, value_str);
+}
+
+int16_t yang_dnode_get_int16(const struct lyd_node *dnode,
+			     const char *xpath_fmt, ...)
+{
+	const struct lyd_value *dvalue;
+	dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
+	assert(dvalue->realtype->basetype == LY_TYPE_INT16);
+	return dvalue->int16;
+}
+
+int16_t yang_get_default_int16(const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	return yang_str2int16(value);
+}
+
+/*
+ * Primitive type: int32.
+ */
+int32_t yang_str2int32(const char *value)
+{
+	return strtol(value, NULL, 10);
+}
+
+struct yang_data *yang_data_new_int32(const char *xpath, int32_t value)
+{
+	char value_str[BUFSIZ];
+
+	snprintf(value_str, sizeof(value_str), "%d", value);
+	return yang_data_new(xpath, value_str);
+}
+
+int32_t yang_dnode_get_int32(const struct lyd_node *dnode,
+			     const char *xpath_fmt, ...)
+{
+	const struct lyd_value *dvalue;
+	dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
+	assert(dvalue->realtype->basetype == LY_TYPE_INT32);
+	return dvalue->int32;
+}
+
+int32_t yang_get_default_int32(const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	return yang_str2int32(value);
+}
+
+/*
+ * Primitive type: int64.
+ */
+int64_t yang_str2int64(const char *value)
+{
+	return strtoll(value, NULL, 10);
+}
+
+struct yang_data *yang_data_new_int64(const char *xpath, int64_t value)
+{
+	char value_str[BUFSIZ];
+
+	snprintfrr(value_str, sizeof(value_str), "%" PRId64, value);
+	return yang_data_new(xpath, value_str);
+}
+
+int64_t yang_dnode_get_int64(const struct lyd_node *dnode,
+			     const char *xpath_fmt, ...)
+{
+	const struct lyd_value *dvalue;
+	dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
+	assert(dvalue->realtype->basetype == LY_TYPE_INT64);
+	return dvalue->int64;
+}
+
+int64_t yang_get_default_int64(const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	return yang_str2int64(value);
+}
+
+/*
+ * Primitive type: uint8.
+ */
+uint8_t yang_str2uint8(const char *value)
+{
+	return strtoul(value, NULL, 10);
+}
+
+struct yang_data *yang_data_new_uint8(const char *xpath, uint8_t value)
+{
+	char value_str[BUFSIZ];
+
+	snprintf(value_str, sizeof(value_str), "%u", value);
+	return yang_data_new(xpath, value_str);
+}
+
+uint8_t yang_dnode_get_uint8(const struct lyd_node *dnode,
+			     const char *xpath_fmt, ...)
+{
+	const struct lyd_value *dvalue;
+	dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
+	assert(dvalue->realtype->basetype == LY_TYPE_UINT8);
+	return dvalue->uint8;
+}
+
+uint8_t yang_get_default_uint8(const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	return yang_str2uint8(value);
+}
+
+/*
+ * Primitive type: uint16.
+ */
+uint16_t yang_str2uint16(const char *value)
+{
+	return strtoul(value, NULL, 10);
+}
+
+struct yang_data *yang_data_new_uint16(const char *xpath, uint16_t value)
+{
+	char value_str[BUFSIZ];
+
+	snprintf(value_str, sizeof(value_str), "%u", value);
+	return yang_data_new(xpath, value_str);
+}
+
+uint16_t yang_dnode_get_uint16(const struct lyd_node *dnode,
+			       const char *xpath_fmt, ...)
+{
+	const struct lyd_value *dvalue;
+	dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
+	assert(dvalue->realtype->basetype == LY_TYPE_UINT16);
+	return dvalue->uint16;
+}
+
+uint16_t yang_get_default_uint16(const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	return yang_str2uint16(value);
+}
+
+/*
+ * Primitive type: uint32.
+ */
+uint32_t yang_str2uint32(const char *value)
+{
+	return strtoul(value, NULL, 10);
+}
+
+struct yang_data *yang_data_new_uint32(const char *xpath, uint32_t value)
+{
+	char value_str[BUFSIZ];
+
+	snprintf(value_str, sizeof(value_str), "%u", value);
+	return yang_data_new(xpath, value_str);
+}
+
+uint32_t yang_dnode_get_uint32(const struct lyd_node *dnode,
+			       const char *xpath_fmt, ...)
+{
+	const struct lyd_value *dvalue;
+	dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
+	assert(dvalue->realtype->basetype == LY_TYPE_UINT32);
+	return dvalue->uint32;
+}
+
+uint32_t yang_get_default_uint32(const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	return yang_str2uint32(value);
+}
+
+/*
+ * Primitive type: uint64.
+ */
+uint64_t yang_str2uint64(const char *value)
+{
+	return strtoull(value, NULL, 10);
+}
+
+struct yang_data *yang_data_new_uint64(const char *xpath, uint64_t value)
+{
+	char value_str[BUFSIZ];
+
+	snprintfrr(value_str, sizeof(value_str), "%" PRIu64, value);
+	return yang_data_new(xpath, value_str);
+}
+
+uint64_t yang_dnode_get_uint64(const struct lyd_node *dnode,
+			       const char *xpath_fmt, ...)
+{
+	const struct lyd_value *dvalue;
+	dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
+	assert(dvalue->realtype->basetype == LY_TYPE_UINT64);
+	return dvalue->uint64;
+}
+
+uint64_t yang_get_default_uint64(const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	return yang_str2uint64(value);
+}
+
+/*
+ * Primitive type: string.
+ *
+ * All string wrappers can be used with non-string types.
+ */
+struct yang_data *yang_data_new_string(const char *xpath, const char *value)
+{
+	return yang_data_new(xpath, value);
+}
+
+const char *yang_dnode_get_string(const struct lyd_node *dnode,
+				  const char *xpath_fmt, ...)
+{
+	return YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
+}
+
+void yang_dnode_get_string_buf(char *buf, size_t size,
+			       const struct lyd_node *dnode,
+			       const char *xpath_fmt, ...)
+{
+	const char *canon = YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
+	if (strlcpy(buf, canon, size) >= size) {
+		char xpath[XPATH_MAXLEN];
+
+		yang_dnode_get_path(dnode, xpath, sizeof(xpath));
+		flog_warn(EC_LIB_YANG_DATA_TRUNCATED,
+			  "%s: value was truncated [xpath %s]", __func__,
+			  xpath);
+	}
+}
+
+const char *yang_get_default_string(const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	return yang_get_default_value(xpath);
+}
+
+void yang_get_default_string_buf(char *buf, size_t size, const char *xpath_fmt,
+				 ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	if (strlcpy(buf, value, size) >= size)
+		flog_warn(EC_LIB_YANG_DATA_TRUNCATED,
+			  "%s: value was truncated [xpath %s]", __func__,
+			  xpath);
+}
+
+/*
+ * Primitive type: binary.
+ */
+struct yang_data *yang_data_new_binary(const char *xpath, const char *value,
+				       size_t len)
+{
+	char *value_str;
+	struct base64_encodestate s;
+	int cnt;
+	char *c;
+	struct yang_data *data;
+
+	value_str = (char *)malloc(len * 2);
+	base64_init_encodestate(&s);
+	cnt = base64_encode_block(value, len, value_str, &s);
+	c = value_str + cnt;
+	cnt = base64_encode_blockend(c, &s);
+	c += cnt;
+	*c = 0;
+	data = yang_data_new(xpath, value_str);
+	free(value_str);
+	return data;
+}
+
+size_t yang_dnode_get_binary_buf(char *buf, size_t size,
+				 const struct lyd_node *dnode,
+				 const char *xpath_fmt, ...)
+{
+	const char *canon;
+	size_t cannon_len;
+	size_t decode_len;
+	size_t ret_len;
+	size_t cnt;
+	char *value_str;
+	struct base64_decodestate s;
+
+	canon = YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
+	cannon_len = strlen(canon);
+	decode_len = cannon_len + 1;
+	value_str = (char *)malloc(decode_len);
+	base64_init_decodestate(&s);
+	cnt = base64_decode_block(canon, cannon_len, value_str, &s);
+
+	ret_len = size > cnt ? cnt : size;
+	memcpy(buf, value_str, ret_len);
+	if (size < cnt) {
+		char xpath[XPATH_MAXLEN];
+
+		yang_dnode_get_path(dnode, xpath, sizeof(xpath));
+		flog_warn(EC_LIB_YANG_DATA_TRUNCATED,
+			  "%s: value was truncated [xpath %s]", __func__,
+			  xpath);
+	}
+	free(value_str);
+	return ret_len;
+}
+
+
+/*
+ * Primitive type: empty.
+ */
+struct yang_data *yang_data_new_empty(const char *xpath)
+{
+	return yang_data_new(xpath, NULL);
+}
+
+bool yang_dnode_get_empty(const struct lyd_node *dnode, const char *xpath_fmt,
+			  ...)
+{
+	va_list ap;
+	char xpath[XPATH_MAXLEN];
+	const struct lyd_node_term *dleaf;
+
+	assert(dnode);
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	dnode = yang_dnode_get(dnode, xpath);
+	if (dnode) {
+		dleaf = (const struct lyd_node_term *)dnode;
+		if (dleaf->value.realtype->basetype == LY_TYPE_EMPTY)
+			return true;
+	}
+
+	return false;
+}
+
+/*
+ * Derived type: IP prefix.
+ */
+void yang_str2prefix(const char *value, union prefixptr prefix)
+{
+	(void)str2prefix(value, prefix.p);
+	apply_mask(prefix.p);
+}
+
+struct yang_data *yang_data_new_prefix(const char *xpath,
+				       union prefixconstptr prefix)
+{
+	char value_str[PREFIX2STR_BUFFER];
+
+	(void)prefix2str(prefix.p, value_str, sizeof(value_str));
+	return yang_data_new(xpath, value_str);
+}
+
+void yang_dnode_get_prefix(struct prefix *prefix, const struct lyd_node *dnode,
+			   const char *xpath_fmt, ...)
+{
+	const char *canon;
+	/*
+	 * Initialize prefix to avoid static analyzer complaints about
+	 * uninitialized memory.
+	 */
+	memset(prefix, 0, sizeof(*prefix));
+
+	/* XXX ip_prefix is a native type now in ly2, leverage? */
+	canon = YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
+	(void)str2prefix(canon, prefix);
+}
+
+void yang_get_default_prefix(union prefixptr var, const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	yang_str2prefix(value, var);
+}
+
+/*
+ * Derived type: ipv4.
+ */
+void yang_str2ipv4(const char *value, struct in_addr *addr)
+{
+	(void)inet_pton(AF_INET, value, addr);
+}
+
+struct yang_data *yang_data_new_ipv4(const char *xpath,
+				     const struct in_addr *addr)
+{
+	char value_str[INET_ADDRSTRLEN];
+
+	(void)inet_ntop(AF_INET, addr, value_str, sizeof(value_str));
+	return yang_data_new(xpath, value_str);
+}
+
+void yang_dnode_get_ipv4(struct in_addr *addr, const struct lyd_node *dnode,
+			 const char *xpath_fmt, ...)
+{
+	/* XXX libyang2 IPv4 address is a native type now in ly2 */
+	const char *canon = YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
+	(void)inet_pton(AF_INET, canon, addr);
+}
+
+void yang_get_default_ipv4(struct in_addr *var, const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	yang_str2ipv4(value, var);
+}
+
+/*
+ * Derived type: ipv4p.
+ */
+void yang_str2ipv4p(const char *value, union prefixptr prefix)
+{
+	struct prefix_ipv4 *prefix4 = prefix.p4;
+
+	(void)str2prefix_ipv4(value, prefix4);
+	apply_mask_ipv4(prefix4);
+}
+
+struct yang_data *yang_data_new_ipv4p(const char *xpath,
+				      union prefixconstptr prefix)
+{
+	char value_str[PREFIX2STR_BUFFER];
+
+	(void)prefix2str(prefix.p, value_str, sizeof(value_str));
+	return yang_data_new(xpath, value_str);
+}
+
+void yang_dnode_get_ipv4p(union prefixptr prefix, const struct lyd_node *dnode,
+			  const char *xpath_fmt, ...)
+{
+	struct prefix_ipv4 *prefix4 = prefix.p4;
+	/* XXX libyang2: ipv4/6 address is a native type now in ly2 */
+	const char *canon = YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
+	(void)str2prefix_ipv4(canon, prefix4);
+}
+
+void yang_get_default_ipv4p(union prefixptr var, const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	yang_str2ipv4p(value, var);
+}
+
+/*
+ * Derived type: ipv6.
+ */
+void yang_str2ipv6(const char *value, struct in6_addr *addr)
+{
+	(void)inet_pton(AF_INET6, value, addr);
+}
+
+struct yang_data *yang_data_new_ipv6(const char *xpath,
+				     const struct in6_addr *addr)
+{
+	char value_str[INET6_ADDRSTRLEN];
+
+	(void)inet_ntop(AF_INET6, addr, value_str, sizeof(value_str));
+	return yang_data_new(xpath, value_str);
+}
+
+void yang_dnode_get_ipv6(struct in6_addr *addr, const struct lyd_node *dnode,
+			 const char *xpath_fmt, ...)
+{
+	/* XXX libyang2: IPv6 address is a native type now, leverage. */
+	const char *canon = YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
+	(void)inet_pton(AF_INET6, canon, addr);
+}
+
+void yang_get_default_ipv6(struct in6_addr *var, const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	yang_str2ipv6(value, var);
+}
+
+/*
+ * Derived type: ipv6p.
+ */
+void yang_str2ipv6p(const char *value, union prefixptr prefix)
+{
+	struct prefix_ipv6 *prefix6 = prefix.p6;
+
+	(void)str2prefix_ipv6(value, prefix6);
+	apply_mask_ipv6(prefix6);
+}
+
+struct yang_data *yang_data_new_ipv6p(const char *xpath,
+				      union prefixconstptr prefix)
+{
+	char value_str[PREFIX2STR_BUFFER];
+
+	(void)prefix2str(prefix.p, value_str, sizeof(value_str));
+	return yang_data_new(xpath, value_str);
+}
+
+void yang_dnode_get_ipv6p(union prefixptr prefix, const struct lyd_node *dnode,
+			  const char *xpath_fmt, ...)
+{
+	struct prefix_ipv6 *prefix6 = prefix.p6;
+
+	/* XXX IPv6 address is a native type now in ly2 -- can we leverage? */
+	const char *canon = YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
+	(void)str2prefix_ipv6(canon, prefix6);
+}
+
+void yang_get_default_ipv6p(union prefixptr var, const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	yang_str2ipv6p(value, var);
+}
+
+/*
+ * Derived type: ip.
+ */
+void yang_str2ip(const char *value, struct ipaddr *ip)
+{
+	(void)str2ipaddr(value, ip);
+}
+
+struct yang_data *yang_data_new_ip(const char *xpath, const struct ipaddr *addr)
+{
+	size_t sz = IS_IPADDR_V4(addr) ? INET_ADDRSTRLEN : INET6_ADDRSTRLEN;
+	char value_str[sz];
+
+	ipaddr2str(addr, value_str, sizeof(value_str));
+	return yang_data_new(xpath, value_str);
+}
+
+void yang_dnode_get_ip(struct ipaddr *addr, const struct lyd_node *dnode,
+		       const char *xpath_fmt, ...)
+{
+	/* XXX IPv4 address could be a plugin type now in ly2, leverage? */
+	const char *canon = YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
+	(void)str2ipaddr(canon, addr);
+}
+
+void yang_get_default_ip(struct ipaddr *var, const char *xpath_fmt, ...)
+{
+	char xpath[XPATH_MAXLEN];
+	const char *value;
+	va_list ap;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	value = yang_get_default_value(xpath);
+	yang_str2ip(value, var);
+}
+
+struct yang_data *yang_data_new_mac(const char *xpath,
+				    const struct ethaddr *mac)
+{
+	char value_str[ETHER_ADDR_STRLEN];
+
+	prefix_mac2str(mac, value_str, sizeof(value_str));
+	return yang_data_new(xpath, value_str);
+}
+
+void yang_str2mac(const char *value, struct ethaddr *mac)
+{
+	(void)prefix_str2mac(value, mac);
+}
+
+struct yang_data *yang_data_new_date_and_time(const char *xpath, time_t time)
+{
+	struct tm tm;
+	char timebuf[MONOTIME_STRLEN];
+	struct timeval _time, time_real;
+	char *ts_dot;
+	uint16_t buflen;
+
+	_time.tv_sec = time;
+	_time.tv_usec = 0;
+	monotime_to_realtime(&_time, &time_real);
+
+	gmtime_r(&time_real.tv_sec, &tm);
+
+	/* rfc-3339 format */
+	strftime(timebuf, sizeof(timebuf), "%Y-%m-%dT%H:%M:%S", &tm);
+	buflen = strlen(timebuf);
+	ts_dot = timebuf + buflen;
+
+	/* microseconds and appends Z */
+	snprintfrr(ts_dot, sizeof(timebuf) - buflen, ".%06luZ",
+		   (unsigned long)time_real.tv_usec);
+
+	return yang_data_new(xpath, timebuf);
+}
+
+const char *yang_nexthop_type2str(uint32_t ntype)
+{
+	switch (ntype) {
+	case NEXTHOP_TYPE_IFINDEX:
+		return "ifindex";
+		break;
+	case NEXTHOP_TYPE_IPV4:
+		return "ip4";
+		break;
+	case NEXTHOP_TYPE_IPV4_IFINDEX:
+		return "ip4-ifindex";
+		break;
+	case NEXTHOP_TYPE_IPV6:
+		return "ip6";
+		break;
+	case NEXTHOP_TYPE_IPV6_IFINDEX:
+		return "ip6-ifindex";
+		break;
+	case NEXTHOP_TYPE_BLACKHOLE:
+		return "blackhole";
+		break;
+	default:
+		return "unknown";
+		break;
+	}
+}
+
+
+const char *yang_afi_safi_value2identity(afi_t afi, safi_t safi)
+{
+	if (afi == AFI_IP && safi == SAFI_UNICAST)
+		return "frr-routing:ipv4-unicast";
+	if (afi == AFI_IP6 && safi == SAFI_UNICAST)
+		return "frr-routing:ipv6-unicast";
+	if (afi == AFI_IP && safi == SAFI_MULTICAST)
+		return "frr-routing:ipv4-multicast";
+	if (afi == AFI_IP6 && safi == SAFI_MULTICAST)
+		return "frr-routing:ipv6-multicast";
+	if (afi == AFI_IP && safi == SAFI_MPLS_VPN)
+		return "frr-routing:l3vpn-ipv4-unicast";
+	if (afi == AFI_IP6 && safi == SAFI_MPLS_VPN)
+		return "frr-routing:l3vpn-ipv6-unicast";
+	if (afi == AFI_L2VPN && safi == SAFI_EVPN)
+		return "frr-routing:l2vpn-evpn";
+	if (afi == AFI_IP && safi == SAFI_LABELED_UNICAST)
+		return "frr-routing:ipv4-labeled-unicast";
+	if (afi == AFI_IP6 && safi == SAFI_LABELED_UNICAST)
+		return "frr-routing:ipv6-labeled-unicast";
+	if (afi == AFI_IP && safi == SAFI_FLOWSPEC)
+		return "frr-routing:ipv4-flowspec";
+	if (afi == AFI_IP6 && safi == SAFI_FLOWSPEC)
+		return "frr-routing:ipv6-flowspec";
+
+	return NULL;
+}
+
+void yang_afi_safi_identity2value(const char *key, afi_t *afi, safi_t *safi)
+{
+	if (strmatch(key, "frr-routing:ipv4-unicast")) {
+		*afi = AFI_IP;
+		*safi = SAFI_UNICAST;
+	} else if (strmatch(key, "frr-routing:ipv6-unicast")) {
+		*afi = AFI_IP6;
+		*safi = SAFI_UNICAST;
+	} else if (strmatch(key, "frr-routing:ipv4-multicast")) {
+		*afi = AFI_IP;
+		*safi = SAFI_MULTICAST;
+	} else if (strmatch(key, "frr-routing:ipv6-multicast")) {
+		*afi = AFI_IP6;
+		*safi = SAFI_MULTICAST;
+	} else if (strmatch(key, "frr-routing:l3vpn-ipv4-unicast")) {
+		*afi = AFI_IP;
+		*safi = SAFI_MPLS_VPN;
+	} else if (strmatch(key, "frr-routing:l3vpn-ipv6-unicast")) {
+		*afi = AFI_IP6;
+		*safi = SAFI_MPLS_VPN;
+	} else if (strmatch(key, "frr-routing:ipv4-labeled-unicast")) {
+		*afi = AFI_IP;
+		*safi = SAFI_LABELED_UNICAST;
+	} else if (strmatch(key, "frr-routing:ipv6-labeled-unicast")) {
+		*afi = AFI_IP6;
+		*safi = SAFI_LABELED_UNICAST;
+	} else if (strmatch(key, "frr-routing:l2vpn-evpn")) {
+		*afi = AFI_L2VPN;
+		*safi = SAFI_EVPN;
+	} else if (strmatch(key, "frr-routing:ipv4-flowspec")) {
+		*afi = AFI_IP;
+		*safi = SAFI_FLOWSPEC;
+	} else if (strmatch(key, "frr-routing:ipv6-flowspec")) {
+		*afi = AFI_IP6;
+		*safi = SAFI_FLOWSPEC;
+	} else {
+		*afi = AFI_UNSPEC;
+		*safi = SAFI_UNSPEC;
+	}
+}