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// SPDX-License-Identifier: ISC
/*
* FRR switchable defaults.
* Copyright (C) 2017-2019 David Lamparter for NetDEF, Inc.
*/
#ifndef _FRR_DEFAULTS_H
#define _FRR_DEFAULTS_H
#include <stdbool.h>
#include "compiler.h"
#ifdef __cplusplus
extern "C" {
#endif
/* frr_default wraps information about a default that has different
* values depending on FRR version or default-set
*
* frr_default_entry describes one match rule and the resulting value;
* entries are evaluated in order and the first matching is used.
*
* If both match_version and match_profile are specified, they must both
* match. A NULL value matches everything.
*/
struct frr_default_entry {
/* syntax: "(<|<=|==|>=|>) [whitespace] version", e.g.
* ">= 6.1-dev" "<6.0"
*/
const char *match_version;
/* exact profile string to compare against */
const char *match_profile;
/* value to use */
bool val_bool;
const char *val_str;
long val_long;
unsigned long val_ulong;
float val_float;
};
/* one struct frr_default exists for each malleable default value */
struct frr_default {
struct frr_default *next;
/* for UI/debug use */
const char *name;
/* the following two sets of variables differ because the written
* config always targets the *current* FRR version
*
* e.g. if you load a config that has "frr version 5.0" on 6.0
* *dflt_long => set to the default value in 5.0
* *save_long => set to the default value in 6.0
* config save will write "frr version 6.0" with 6.0 defaults
*/
/* variable holding the default value for reading/use */
bool *dflt_bool;
const char **dflt_str;
long *dflt_long;
unsigned long *dflt_ulong;
float *dflt_float;
/* variable to use when comparing for config save */
bool *save_bool;
const char **save_str;
long *save_long;
unsigned long *save_ulong;
float *save_float;
struct frr_default_entry entries[];
};
#define _FRR_CFG_DEFAULT(type, typname, varname, ...) \
static type DFLT_##varname; \
static type SAVE_##varname; \
static struct frr_default _dflt_##varname = { \
.name = #varname, \
.dflt_##typname = &DFLT_##varname, \
.save_##typname = &SAVE_##varname, \
.entries = { __VA_ARGS__ }, \
}; \
static void _dfltinit_##varname(void) \
__attribute__((_CONSTRUCTOR(1000))); \
static void _dfltinit_##varname(void) \
{ \
frr_default_add(&_dflt_##varname); \
} \
MACRO_REQUIRE_SEMICOLON() /* end */
/* use:
* FRR_CFG_DEFAULT_LONG(SHARP_BLUNTNESS,
* { .val_long = 2, .match_version = ">= 10.0" },
* { .val_long = 1, .match_profile = "datacenter" },
* { .val_long = 0 },
* )
*
* This will create DFLT_SHARP_BLUNTNESS and SAVE_SHARP_BLUNTNESS variables.
*
* Note: preprocessor defines cannot be used as variable names because they
* will be expanded and blow up with a compile error. Use an enum or add an
* extra _ at the beginning (e.g. _SHARP_BLUNTNESS => DFLT__SHARP_BLUNTNESS)
*/
#define FRR_CFG_DEFAULT_BOOL(varname, ...) \
_FRR_CFG_DEFAULT(bool, bool, varname, ## __VA_ARGS__)
#define FRR_CFG_DEFAULT_LONG(varname, ...) \
_FRR_CFG_DEFAULT(long, long, varname, ## __VA_ARGS__)
#define FRR_CFG_DEFAULT_ULONG(varname, ...) \
_FRR_CFG_DEFAULT(unsigned long, ulong, varname, ## __VA_ARGS__)
#define FRR_CFG_DEFAULT_FLOAT(varname, ...) \
_FRR_CFG_DEFAULT(float, float, varname, ## __VA_ARGS__)
#define FRR_CFG_DEFAULT_STR(varname, ...) \
_FRR_CFG_DEFAULT(const char *, str, varname, ## __VA_ARGS__)
/* daemons don't need to call any of these, libfrr handles that */
extern void frr_default_add(struct frr_default *dflt);
extern void frr_defaults_version_set(const char *version);
extern void frr_defaults_profile_set(const char *profile);
extern const char *frr_defaults_version(void);
extern const char *frr_defaults_profile(void);
extern void frr_defaults_apply(void);
extern const char *frr_defaults_profiles[];
extern bool frr_defaults_profile_valid(const char *profile);
/* like strcmp(), but with version ordering */
extern int frr_version_cmp(const char *aa, const char *bb);
#ifdef __cplusplus
}
#endif
#endif /* _FRR_DEFAULTS_H */
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