lib: disallow access list duplicated values

Don't allow users to create multiple rules in the same list with the
same value to keep the behavior previously to northbound migration.

Signed-off-by: Rafael Zalamena <rzalamena@opensourcerouting.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/lib/filter.h b/lib/filter.h
index 623fb94527..c6dc269276 100644
--- a/lib/filter.h
+++ b/lib/filter.h
@@ -176,6 +176,33 @@ enum yang_prefix_list_action {
 	YPLA_PERMIT = 1,
 };
 
+struct acl_dup_args {
+	/** Access list type ("ipv4", "ipv6" or "mac"). */
+	const char *ada_type;
+	/** Access list name. */
+	const char *ada_name;
+
+#define ADA_MAX_VALUES 4
+	/** Entry XPath for value. */
+	const char *ada_xpath[ADA_MAX_VALUES];
+	/** Entry value to match. */
+	const char *ada_value[ADA_MAX_VALUES];
+
+	/** Duplicated entry found in list? */
+	bool ada_found;
+
+	/** (Optional) Already existing `dnode`. */
+	const struct lyd_node *ada_entry_dnode;
+};
+
+/**
+ * Check for duplicated entries using the candidate configuration.
+ *
+ * \param vty so we can get the candidate config.
+ * \param ada the arguments to check.
+ */
+bool acl_is_dup(const struct lyd_node *dnode, struct acl_dup_args *ada);
+
 /* filter_cli.c */
 struct lyd_node;
 struct vty;