1 files changed, 149 insertions, 0 deletions
diff --git a/lib/util/params.h b/lib/util/params.h
new file mode 100644
index 0000000..fa77964
--- /dev/null
+++ b/lib/util/params.h
@@ -0,0 +1,149 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __PARAMS_H
+#define __PARAMS_H
+
+#include <getopt.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/if_ether.h>
+#include <bpf/libbpf.h>
+
+enum option_type {
+	OPT_NONE,
+	OPT_BOOL,
+	OPT_FLAGS,
+	OPT_STRING,
+	OPT_U16,
+	OPT_U32,
+	OPT_U32_MULTI,
+	OPT_MACADDR,
+	OPT_IFNAME,
+	OPT_IFNAME_MULTI,
+	OPT_IPADDR,
+	OPT_ENUM,
+	OPT_MULTISTRING,
+	__OPT_MAX
+};
+
+struct prog_option {
+	enum option_type type;
+	size_t cfg_size;
+	size_t cfg_offset;
+	size_t opt_size;
+	char *name;
+	char short_opt;
+	char *help;
+	char *metavar;
+	void *typearg;
+	bool required;
+	bool positional;
+	unsigned int min_num;
+	unsigned int max_num;
+	unsigned int num_set;
+};
+
+struct flag_val {
+	const char *flagstring;
+	unsigned int flagval;
+};
+
+struct enum_val {
+	const char *name;
+	unsigned int value;
+};
+
+struct multistring {
+	const char **strings;
+	size_t num_strings;
+};
+
+struct u32_multi {
+	__u32 *vals;
+	size_t num_vals;
+};
+
+struct iface {
+	struct iface *next;
+	char *ifname;
+	int ifindex;
+};
+
+struct ip_addr {
+	int af;
+	union {
+		struct in_addr addr4;
+		struct in6_addr addr6;
+	} addr;
+};
+
+struct mac_addr {
+	unsigned char addr[ETH_ALEN];
+};
+
+#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
+
+#define DEFINE_OPTION(_name, _type, _cfgtype, _cfgmember, ...)               \
+	{                                                                    \
+		.cfg_size = sizeof(_cfgtype),                                \
+		.opt_size = sizeof_field(_cfgtype, _cfgmember),              \
+		.cfg_offset = offsetof(_cfgtype, _cfgmember), .name = _name, \
+		.type = _type, __VA_ARGS__                                   \
+	}
+
+#define END_OPTIONS \
+	{           \
+	}
+
+#define FOR_EACH_OPTION(_options, _opt) \
+	for (_opt = _options; _opt->type != OPT_NONE; _opt++)
+
+struct prog_command {
+	const char *name;
+	int (*func)(const void *cfg, const char *pin_root_path);
+	struct prog_option *options;
+	const void *default_cfg;
+	char *doc;
+	bool no_cfg;
+};
+
+#define DEFINE_COMMAND_NAME(_name, _func, _doc)                               \
+	{                                                                     \
+		.name = _name, .func = do_##_func,                        \
+		.options = _func##_options, .default_cfg = &defaults_##_func, \
+		.doc = _doc                                                   \
+	}
+#define DEFINE_COMMAND(_name, _doc) DEFINE_COMMAND_NAME(textify(_name), _name, _doc)
+
+#define DEFINE_COMMAND_NODEF(_name, _doc)                   \
+	{                                                   \
+		.name = textify(_name), .func = do_##_name, \
+		.options = _name##_options, .doc = _doc     \
+	}
+
+#define END_COMMANDS \
+	{            \
+	}
+
+const char *get_enum_name(const struct enum_val *vals, unsigned int value);
+void print_flags(char *buf, size_t buf_len, const struct flag_val *flags,
+		 unsigned long flags_val);
+void print_addr(char *buf, size_t buf_len, const struct ip_addr *addr);
+void print_macaddr(char *buf, size_t buf_len, const struct mac_addr *addr);
+bool macaddr_is_null(const struct mac_addr *addr);
+bool ipaddr_is_null(const struct ip_addr *addr);
+bool is_prefix(const char *prefix, const char *string);
+void usage(const char *prog_name, const char *doc,
+	   const struct prog_option *long_options, bool full);
+
+int parse_cmdline_args(int argc, char **argv, struct prog_option *long_options,
+		       void *cfg, const char *prog, const char *usage_cmd,
+		       const char *doc, const void *defaults);
+
+int dispatch_commands(const char *argv0, int argc, char **argv,
+		      const struct prog_command *cmds, size_t cfg_size,
+		      const char *prog_name, bool needs_bpffs);
+
+#endif /* __COMMON_PARAMS_H */