diff options
Diffstat (limited to 'lib/yang.c')
| -rw-r--r-- | lib/yang.c | 929 |
1 files changed, 929 insertions, 0 deletions
diff --git a/lib/yang.c b/lib/yang.c new file mode 100644 index 0000000..4dd8654 --- /dev/null +++ b/lib/yang.c @@ -0,0 +1,929 @@ +// 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 "yang.h" +#include "yang_translator.h" +#include "northbound.h" + +DEFINE_MTYPE_STATIC(LIB, YANG_MODULE, "YANG module"); +DEFINE_MTYPE_STATIC(LIB, YANG_DATA, "YANG data structure"); + +/* libyang container. */ +struct ly_ctx *ly_native_ctx; + +static struct yang_module_embed *embeds, **embedupd = &embeds; + +void yang_module_embed(struct yang_module_embed *embed) +{ + embed->next = NULL; + *embedupd = embed; + embedupd = &embed->next; +} + +static LY_ERR yang_module_imp_clb(const char *mod_name, const char *mod_rev, + const char *submod_name, + const char *submod_rev, void *user_data, + LYS_INFORMAT *format, + const char **module_data, + void (**free_module_data)(void *, void *)) +{ + struct yang_module_embed *e; + + if (!strcmp(mod_name, "ietf-inet-types") || + !strcmp(mod_name, "ietf-yang-types")) + /* libyang has these built in, don't try finding them here */ + return LY_ENOTFOUND; + + for (e = embeds; e; e = e->next) { + if (e->sub_mod_name && submod_name) { + if (strcmp(e->sub_mod_name, submod_name)) + continue; + + if (submod_rev && strcmp(e->sub_mod_rev, submod_rev)) + continue; + } else { + if (strcmp(e->mod_name, mod_name)) + continue; + + if (mod_rev && strcmp(e->mod_rev, mod_rev)) + continue; + } + + *format = e->format; + *module_data = e->data; + return LY_SUCCESS; + } + + /* We get here for indirect modules like ietf-inet-types */ + zlog_debug( + "YANG model \"%s@%s\" \"%s@%s\"not embedded, trying external file", + mod_name, mod_rev ? mod_rev : "*", + submod_name ? submod_name : "*", submod_rev ? submod_rev : "*"); + + return LY_ENOTFOUND; +} + +/* clang-format off */ +static const char *const frr_native_modules[] = { + "frr-interface", + "frr-vrf", + "frr-routing", + "frr-affinity-map", + "frr-route-map", + "frr-nexthop", + "frr-ripd", + "frr-ripngd", + "frr-isisd", + "frr-vrrpd", + "frr-zebra", + "frr-pathd", +}; +/* clang-format on */ + +/* Generate the yang_modules tree. */ +static inline int yang_module_compare(const struct yang_module *a, + const struct yang_module *b) +{ + return strcmp(a->name, b->name); +} +RB_GENERATE(yang_modules, yang_module, entry, yang_module_compare) + +struct yang_modules yang_modules = RB_INITIALIZER(&yang_modules); + +struct yang_module *yang_module_load(const char *module_name) +{ + struct yang_module *module; + const struct lys_module *module_info; + + module_info = + ly_ctx_load_module(ly_native_ctx, module_name, NULL, NULL); + if (!module_info) { + flog_err(EC_LIB_YANG_MODULE_LOAD, + "%s: failed to load data model: %s", __func__, + module_name); + exit(1); + } + + module = XCALLOC(MTYPE_YANG_MODULE, sizeof(*module)); + module->name = module_name; + module->info = module_info; + + if (RB_INSERT(yang_modules, &yang_modules, module) != NULL) { + flog_err(EC_LIB_YANG_MODULE_LOADED_ALREADY, + "%s: YANG module is loaded already: %s", __func__, + module_name); + exit(1); + } + + return module; +} + +void yang_module_load_all(void) +{ + for (size_t i = 0; i < array_size(frr_native_modules); i++) + yang_module_load(frr_native_modules[i]); +} + +struct yang_module *yang_module_find(const char *module_name) +{ + struct yang_module s; + + s.name = module_name; + return RB_FIND(yang_modules, &yang_modules, &s); +} + +int yang_snodes_iterate_subtree(const struct lysc_node *snode, + const struct lys_module *module, + yang_iterate_cb cb, uint16_t flags, void *arg) +{ + const struct lysc_node *child; + int ret = YANG_ITER_CONTINUE; + + if (module && snode->module != module) + goto next; + + switch (snode->nodetype) { + case LYS_CONTAINER: + if (CHECK_FLAG(flags, YANG_ITER_FILTER_NPCONTAINERS)) { + if (!CHECK_FLAG(snode->flags, LYS_PRESENCE)) + goto next; + } + break; + case LYS_LEAF: + if (CHECK_FLAG(flags, YANG_ITER_FILTER_LIST_KEYS)) { + /* Ignore list keys. */ + if (lysc_is_key(snode)) + goto next; + } + break; + case LYS_INPUT: + case LYS_OUTPUT: + if (CHECK_FLAG(flags, YANG_ITER_FILTER_INPUT_OUTPUT)) + goto next; + break; + default: + assert(snode->nodetype != LYS_AUGMENT + && snode->nodetype != LYS_GROUPING + && snode->nodetype != LYS_USES); + break; + } + + ret = (*cb)(snode, arg); + if (ret == YANG_ITER_STOP) + return ret; + +next: + /* + * YANG leafs and leaf-lists can't have child nodes. + */ + if (CHECK_FLAG(snode->nodetype, LYS_LEAF | LYS_LEAFLIST)) + return YANG_ITER_CONTINUE; + + LY_LIST_FOR (lysc_node_child(snode), child) { + ret = yang_snodes_iterate_subtree(child, module, cb, flags, + arg); + if (ret == YANG_ITER_STOP) + return ret; + } + return ret; +} + +int yang_snodes_iterate(const struct lys_module *module, yang_iterate_cb cb, + uint16_t flags, void *arg) +{ + const struct lys_module *module_iter; + uint32_t idx = 0; + int ret = YANG_ITER_CONTINUE; + + idx = ly_ctx_internal_modules_count(ly_native_ctx); + while ((module_iter = ly_ctx_get_module_iter(ly_native_ctx, &idx))) { + struct lysc_node *snode; + + if (!module_iter->implemented) + continue; + + LY_LIST_FOR (module_iter->compiled->data, snode) { + ret = yang_snodes_iterate_subtree(snode, module, cb, + flags, arg); + if (ret == YANG_ITER_STOP) + return ret; + } + LY_LIST_FOR (&module_iter->compiled->rpcs->node, snode) { + ret = yang_snodes_iterate_subtree(snode, module, cb, + flags, arg); + if (ret == YANG_ITER_STOP) + return ret; + } + LY_LIST_FOR (&module_iter->compiled->notifs->node, snode) { + ret = yang_snodes_iterate_subtree(snode, module, cb, + flags, arg); + if (ret == YANG_ITER_STOP) + return ret; + } + } + + return ret; +} + +void yang_snode_get_path(const struct lysc_node *snode, + enum yang_path_type type, char *xpath, + size_t xpath_len) +{ + switch (type) { + case YANG_PATH_SCHEMA: + (void)lysc_path(snode, LYSC_PATH_LOG, xpath, xpath_len); + break; + case YANG_PATH_DATA: + (void)lysc_path(snode, LYSC_PATH_DATA, xpath, xpath_len); + break; + default: + flog_err(EC_LIB_DEVELOPMENT, "%s: unknown yang path type: %u", + __func__, type); + exit(1); + } +} + +struct lysc_node *yang_find_snode(struct ly_ctx *ly_ctx, const char *xpath, + uint32_t options) +{ + struct lysc_node *snode; + struct ly_set *set; + LY_ERR err; + + err = lys_find_xpath(ly_native_ctx, NULL, xpath, options, &set); + if (err || !set->count) + return NULL; + + snode = set->snodes[0]; + ly_set_free(set, NULL); + + return snode; +} + +struct lysc_node *yang_snode_real_parent(const struct lysc_node *snode) +{ + struct lysc_node *parent = snode->parent; + + while (parent) { + switch (parent->nodetype) { + case LYS_CONTAINER: + if (CHECK_FLAG(parent->flags, LYS_PRESENCE)) + return parent; + break; + case LYS_LIST: + return parent; + default: + break; + } + parent = parent->parent; + } + + return NULL; +} + +struct lysc_node *yang_snode_parent_list(const struct lysc_node *snode) +{ + struct lysc_node *parent = snode->parent; + + while (parent) { + switch (parent->nodetype) { + case LYS_LIST: + return parent; + default: + break; + } + parent = parent->parent; + } + + return NULL; +} + +bool yang_snode_is_typeless_data(const struct lysc_node *snode) +{ + const struct lysc_node_leaf *sleaf; + + switch (snode->nodetype) { + case LYS_LEAF: + sleaf = (struct lysc_node_leaf *)snode; + if (sleaf->type->basetype == LY_TYPE_EMPTY) + return true; + return false; + case LYS_LEAFLIST: + return false; + default: + return true; + } +} + +const char *yang_snode_get_default(const struct lysc_node *snode) +{ + const struct lysc_node_leaf *sleaf; + + switch (snode->nodetype) { + case LYS_LEAF: + sleaf = (const struct lysc_node_leaf *)snode; + return sleaf->dflt ? lyd_value_get_canonical(sleaf->module->ctx, + sleaf->dflt) + : NULL; + case LYS_LEAFLIST: + /* TODO: check leaf-list default values */ + return NULL; + default: + return NULL; + } +} + +const struct lysc_type *yang_snode_get_type(const struct lysc_node *snode) +{ + struct lysc_node_leaf *sleaf = (struct lysc_node_leaf *)snode; + struct lysc_type *type; + + if (!CHECK_FLAG(sleaf->nodetype, LYS_LEAF | LYS_LEAFLIST)) + return NULL; + + type = sleaf->type; + while (type->basetype == LY_TYPE_LEAFREF) + type = ((struct lysc_type_leafref *)type)->realtype; + + return type; +} + +unsigned int yang_snode_num_keys(const struct lysc_node *snode) +{ + const struct lysc_node_leaf *skey; + uint count = 0; + + if (!CHECK_FLAG(snode->nodetype, LYS_LIST)) + return 0; + + /* Walk list of children */ + LY_FOR_KEYS (snode, skey) { + count++; + } + return count; +} + +void yang_dnode_get_path(const struct lyd_node *dnode, char *xpath, + size_t xpath_len) +{ + lyd_path(dnode, LYD_PATH_STD, xpath, xpath_len); +} + +const char *yang_dnode_get_schema_name(const struct lyd_node *dnode, + const char *xpath_fmt, ...) +{ + if (xpath_fmt) { + va_list ap; + char xpath[XPATH_MAXLEN]; + + va_start(ap, xpath_fmt); + vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap); + va_end(ap); + + dnode = yang_dnode_get(dnode, xpath); + if (!dnode) { + flog_err(EC_LIB_YANG_DNODE_NOT_FOUND, + "%s: couldn't find %s", __func__, xpath); + zlog_backtrace(LOG_ERR); + abort(); + } + } + + return dnode->schema->name; +} + +struct lyd_node *yang_dnode_get(const struct lyd_node *dnode, const char *xpath) +{ + struct ly_set *set = NULL; + struct lyd_node *dnode_ret = NULL; + + /* + * XXX a lot of the code uses this for style I guess. It shouldn't, as + * it adds to the xpath parsing complexity in libyang. + */ + if (xpath[0] == '.' && xpath[1] == '/') + xpath += 2; + + if (lyd_find_xpath(dnode, xpath, &set)) { + /* + * Commenting out the below assert failure as it crashes mgmtd + * when bad xpath is passed. + * + * assert(0); XXX replicates old libyang1 base code + */ + goto exit; + } + if (set->count == 0) + goto exit; + + if (set->count > 1) { + flog_warn(EC_LIB_YANG_DNODE_NOT_FOUND, + "%s: found %u elements (expected 0 or 1) [xpath %s]", + __func__, set->count, xpath); + goto exit; + } + + dnode_ret = set->dnodes[0]; + +exit: + ly_set_free(set, NULL); + + return dnode_ret; +} + +struct lyd_node *yang_dnode_getf(const struct lyd_node *dnode, + const char *xpath_fmt, ...) +{ + va_list ap; + char xpath[XPATH_MAXLEN]; + + va_start(ap, xpath_fmt); + vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap); + va_end(ap); + + return yang_dnode_get(dnode, xpath); +} + +bool yang_dnode_exists(const struct lyd_node *dnode, const char *xpath) +{ + struct ly_set *set = NULL; + bool exists = false; + + if (xpath[0] == '.' && xpath[1] == '/') + xpath += 2; + if (lyd_find_xpath(dnode, xpath, &set)) + return false; + exists = set->count > 0; + ly_set_free(set, NULL); + return exists; +} + +bool yang_dnode_existsf(const struct lyd_node *dnode, const char *xpath_fmt, + ...) +{ + va_list ap; + char xpath[XPATH_MAXLEN]; + + va_start(ap, xpath_fmt); + vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap); + va_end(ap); + + return yang_dnode_exists(dnode, xpath); +} + +void yang_dnode_iterate(yang_dnode_iter_cb cb, void *arg, + const struct lyd_node *dnode, const char *xpath_fmt, + ...) +{ + va_list ap; + char xpath[XPATH_MAXLEN]; + struct ly_set *set; + + va_start(ap, xpath_fmt); + vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap); + va_end(ap); + + if (lyd_find_xpath(dnode, xpath, &set)) { + assert(0); /* XXX libyang2: ly1 code asserted success */ + return; + } + for (unsigned int i = 0; i < set->count; i++) { + int ret; + + ret = (*cb)(set->dnodes[i], arg); + if (ret == YANG_ITER_STOP) + break; + } + + ly_set_free(set, NULL); +} + +bool yang_dnode_is_default(const struct lyd_node *dnode, const char *xpath) +{ + const struct lysc_node *snode; + struct lysc_node_leaf *sleaf; + + if (xpath) + dnode = yang_dnode_get(dnode, xpath); + + assert(dnode); + snode = dnode->schema; + switch (snode->nodetype) { + case LYS_LEAF: + sleaf = (struct lysc_node_leaf *)snode; + if (sleaf->type->basetype == LY_TYPE_EMPTY) + return false; + return lyd_is_default(dnode); + case LYS_LEAFLIST: + /* TODO: check leaf-list default values */ + return false; + case LYS_CONTAINER: + if (CHECK_FLAG(snode->flags, LYS_PRESENCE)) + return false; + return true; + default: + return false; + } +} + +bool yang_dnode_is_defaultf(const struct lyd_node *dnode, const char *xpath_fmt, + ...) +{ + if (!xpath_fmt) + return yang_dnode_is_default(dnode, NULL); + else { + va_list ap; + char xpath[XPATH_MAXLEN]; + + va_start(ap, xpath_fmt); + vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap); + va_end(ap); + + return yang_dnode_is_default(dnode, xpath); + } +} + +bool yang_dnode_is_default_recursive(const struct lyd_node *dnode) +{ + struct lyd_node *root, *dnode_iter; + + if (!yang_dnode_is_default(dnode, NULL)) + return false; + + if (CHECK_FLAG(dnode->schema->nodetype, LYS_LEAF | LYS_LEAFLIST)) + return true; + + LY_LIST_FOR (lyd_child(dnode), root) { + LYD_TREE_DFS_BEGIN (root, dnode_iter) { + if (!yang_dnode_is_default(dnode_iter, NULL)) + return false; + + LYD_TREE_DFS_END(root, dnode_iter); + } + } + + return true; +} + +void yang_dnode_change_leaf(struct lyd_node *dnode, const char *value) +{ + assert(dnode->schema->nodetype == LYS_LEAF); + lyd_change_term(dnode, value); +} + +struct lyd_node *yang_dnode_new(struct ly_ctx *ly_ctx, bool config_only) +{ + struct lyd_node *dnode = NULL; + int options = config_only ? LYD_VALIDATE_NO_STATE : 0; + + if (lyd_validate_all(&dnode, ly_ctx, options, NULL) != 0) { + /* Should never happen. */ + flog_err(EC_LIB_LIBYANG, "%s: lyd_validate() failed", __func__); + exit(1); + } + + return dnode; +} + +struct lyd_node *yang_dnode_dup(const struct lyd_node *dnode) +{ + struct lyd_node *dup = NULL; + LY_ERR err; + err = lyd_dup_siblings(dnode, NULL, LYD_DUP_RECURSIVE, &dup); + assert(!err); + return dup; +} + +void yang_dnode_free(struct lyd_node *dnode) +{ + while (dnode->parent) + dnode = lyd_parent(dnode); + lyd_free_all(dnode); +} + +struct yang_data *yang_data_new(const char *xpath, const char *value) +{ + struct yang_data *data; + + data = XCALLOC(MTYPE_YANG_DATA, sizeof(*data)); + strlcpy(data->xpath, xpath, sizeof(data->xpath)); + if (value) + data->value = strdup(value); + + return data; +} + +void yang_data_free(struct yang_data *data) +{ + if (data->value) + free(data->value); + XFREE(MTYPE_YANG_DATA, data); +} + +struct list *yang_data_list_new(void) +{ + struct list *list; + + list = list_new(); + list->del = (void (*)(void *))yang_data_free; + + return list; +} + +struct yang_data *yang_data_list_find(const struct list *list, + const char *xpath_fmt, ...) +{ + char xpath[XPATH_MAXLEN]; + struct yang_data *data; + struct listnode *node; + va_list ap; + + va_start(ap, xpath_fmt); + vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap); + va_end(ap); + + for (ALL_LIST_ELEMENTS_RO(list, node, data)) + if (strmatch(data->xpath, xpath)) + return data; + + return NULL; +} + +/* Make libyang log its errors using FRR logging infrastructure. */ +static void ly_log_cb(LY_LOG_LEVEL level, const char *msg, const char *path) +{ + int priority = LOG_ERR; + + switch (level) { + case LY_LLERR: + priority = LOG_ERR; + break; + case LY_LLWRN: + priority = LOG_WARNING; + break; + case LY_LLVRB: + case LY_LLDBG: + priority = LOG_DEBUG; + break; + } + + if (path) + zlog(priority, "libyang: %s (%s)", msg, path); + else + zlog(priority, "libyang: %s", msg); +} + +const char *yang_print_errors(struct ly_ctx *ly_ctx, char *buf, size_t buf_len) +{ + struct ly_err_item *ei; + const char *path; + + ei = ly_err_first(ly_ctx); + if (!ei) + return ""; + + strlcpy(buf, "YANG error(s):\n", buf_len); + for (; ei; ei = ei->next) { + strlcat(buf, " ", buf_len); + strlcat(buf, ei->msg, buf_len); + strlcat(buf, "\n", buf_len); + } + + path = ly_errpath(ly_ctx); + if (path) { + strlcat(buf, " YANG path: ", buf_len); + strlcat(buf, path, buf_len); + strlcat(buf, "\n", buf_len); + } + + ly_err_clean(ly_ctx, NULL); + + return buf; +} + +void yang_debugging_set(bool enable) +{ + if (enable) { + ly_log_level(LY_LLDBG); + ly_log_dbg_groups(0xFF); + } else { + ly_log_level(LY_LLERR); + ly_log_dbg_groups(0); + } +} + +struct ly_ctx *yang_ctx_new_setup(bool embedded_modules, bool explicit_compile) +{ + struct ly_ctx *ctx = NULL; + const char *yang_models_path = YANG_MODELS_PATH; + LY_ERR err; + + if (access(yang_models_path, R_OK | X_OK)) { + yang_models_path = NULL; + if (errno == ENOENT) + zlog_info("yang model directory \"%s\" does not exist", + YANG_MODELS_PATH); + else + flog_err_sys(EC_LIB_LIBYANG, + "cannot access yang model directory \"%s\"", + YANG_MODELS_PATH); + } + + uint options = LY_CTX_NO_YANGLIBRARY | LY_CTX_DISABLE_SEARCHDIR_CWD; + if (explicit_compile) + options |= LY_CTX_EXPLICIT_COMPILE; + err = ly_ctx_new(yang_models_path, options, &ctx); + if (err) + return NULL; + + if (embedded_modules) + ly_ctx_set_module_imp_clb(ctx, yang_module_imp_clb, NULL); + + return ctx; +} + +void yang_init(bool embedded_modules, bool defer_compile) +{ + /* Initialize libyang global parameters that affect all containers. */ + ly_set_log_clb(ly_log_cb, 1); + ly_log_options(LY_LOLOG | LY_LOSTORE); + + /* Initialize libyang container for native models. */ + ly_native_ctx = yang_ctx_new_setup(embedded_modules, defer_compile); + if (!ly_native_ctx) { + flog_err(EC_LIB_LIBYANG, "%s: ly_ctx_new() failed", __func__); + exit(1); + } + + yang_translator_init(); +} + +void yang_init_loading_complete(void) +{ + /* Compile everything */ + if (ly_ctx_compile(ly_native_ctx) != LY_SUCCESS) { + flog_err(EC_LIB_YANG_MODULE_LOAD, + "%s: failed to compile loaded modules: %s", __func__, + ly_errmsg(ly_native_ctx)); + exit(1); + } +} + +void yang_terminate(void) +{ + struct yang_module *module; + + yang_translator_terminate(); + + while (!RB_EMPTY(yang_modules, &yang_modules)) { + module = RB_ROOT(yang_modules, &yang_modules); + + /* + * We shouldn't call ly_ctx_remove_module() here because this + * function also removes other modules that depend on it. + * + * ly_ctx_destroy() will release all memory for us. + */ + RB_REMOVE(yang_modules, &yang_modules, module); + XFREE(MTYPE_YANG_MODULE, module); + } + + ly_ctx_destroy(ly_native_ctx); +} + +const struct lyd_node *yang_dnode_get_parent(const struct lyd_node *dnode, + const char *name) +{ + const struct lyd_node *orig_dnode = dnode; + + while (orig_dnode) { + switch (orig_dnode->schema->nodetype) { + case LYS_LIST: + case LYS_CONTAINER: + if (!strcmp(orig_dnode->schema->name, name)) + return orig_dnode; + break; + default: + break; + } + + orig_dnode = lyd_parent(orig_dnode); + } + + return NULL; +} + +bool yang_is_last_list_dnode(const struct lyd_node *dnode) +{ + return (((dnode->next == NULL) + || (dnode->next + && (strcmp(dnode->next->schema->name, dnode->schema->name) + != 0))) + && dnode->prev + && ((dnode->prev == dnode) + || (strcmp(dnode->prev->schema->name, dnode->schema->name) + != 0))); +} + +bool yang_is_last_level_dnode(const struct lyd_node *dnode) +{ + const struct lyd_node *parent; + const struct lyd_node *key_leaf; + uint8_t keys_size; + + switch (dnode->schema->nodetype) { + case LYS_LIST: + assert(dnode->parent); + parent = lyd_parent(dnode); + uint snode_num_keys = yang_snode_num_keys(parent->schema); + /* XXX libyang2: q: really don't understand this code. */ + key_leaf = dnode->prev; + for (keys_size = 1; keys_size < snode_num_keys; keys_size++) + key_leaf = key_leaf->prev; + if (key_leaf->prev == dnode) + return true; + break; + case LYS_CONTAINER: + return true; + default: + break; + } + + return false; +} + +const struct lyd_node * +yang_get_subtree_with_no_sibling(const struct lyd_node *dnode) +{ + bool parent = true; + const struct lyd_node *node; + + node = dnode; + if (node->schema->nodetype != LYS_LIST) + return node; + + while (parent) { + switch (node->schema->nodetype) { + case LYS_CONTAINER: + if (!CHECK_FLAG(node->schema->flags, LYS_PRESENCE)) { + if (node->parent + && (node->parent->schema->module + == dnode->schema->module)) + node = lyd_parent(node); + else + parent = false; + } else + parent = false; + break; + case LYS_LIST: + if (yang_is_last_list_dnode(node) + && yang_is_last_level_dnode(node)) { + if (node->parent + && (node->parent->schema->module + == dnode->schema->module)) + node = lyd_parent(node); + else + parent = false; + } else + parent = false; + break; + default: + parent = false; + break; + } + } + return node; +} + +uint32_t yang_get_list_pos(const struct lyd_node *node) +{ + return lyd_list_pos(node); +} + +uint32_t yang_get_list_elements_count(const struct lyd_node *node) +{ + unsigned int count; + const struct lysc_node *schema; + + if (!node + || ((node->schema->nodetype != LYS_LIST) + && (node->schema->nodetype != LYS_LEAFLIST))) { + return 0; + } + + schema = node->schema; + count = 0; + do { + if (node->schema == schema) + ++count; + node = node->next; + } while (node); + return count; +} |