/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * Copyright (c) 1997 Peter Wemm.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for the FreeBSD Project
 *	by Peter Wemm.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * so there!
 */

#pragma once

#include <libifconfig.h>
#include <stdbool.h>

#define	__constructor	__attribute__((constructor))

#ifdef WITHOUT_NETLINK
#define	__netlink_used		__unused
#define	__netlink_unused
#else
#define	__netlink_used
#define	__netlink_unused	__unused
#endif

struct afswtch;
struct cmd;
struct snl_state;
struct ifconfig_args;
struct ifconfig_context {
	struct ifconfig_args	*args;
	const struct afswtch	*afp;
	int			io_s;		/* fd to use for ioctl() */
	struct snl_state	*io_ss;		/* NETLINK_ROUTE socket */
	const char		*ifname;	/* Current interface name */
	char			_ifname_storage_ioctl[IFNAMSIZ];
};
typedef struct ifconfig_context if_ctx;

typedef	void c_func(if_ctx *ctx, const char *cmd, int arg);
typedef	void c_func2(if_ctx *ctx, const char *arg1, const char *arg2);
typedef	void c_func3(if_ctx *ctx, const char *cmd, const char *arg);

struct cmd {
	const char *c_name;
	int	c_parameter;
#define	NEXTARG		0xffffff	/* has following arg */
#define	NEXTARG2	0xfffffe	/* has 2 following args */
#define	OPTARG		0xfffffd	/* has optional following arg */
#define	SPARAM		0xfffffc	/* parameter is string c_sparameter */
	const char *c_sparameter;
	union {
		c_func	*c_func;
		c_func2	*c_func2;
		c_func3	*c_func3;
	} c_u;
	int	c_iscloneop;
	struct cmd *c_next;
};
void	cmd_register(struct cmd *);

typedef	void callback_func(if_ctx *, void *);
void	callback_register(callback_func *, void *);

/*
 * Macros for initializing command handlers.
 */

#define	DEF_CMD(name, param, func) {		\
    .c_name = (name),				\
    .c_parameter = (param),			\
    .c_u = { .c_func = (func) },		\
    .c_iscloneop = 0,				\
    .c_next = NULL,				\
}
#define	DEF_CMD_ARG(name, func) {		\
    .c_name = (name),				\
    .c_parameter = NEXTARG,			\
    .c_u = { .c_func = (func) },		\
    .c_iscloneop = 0,				\
    .c_next = NULL,				\
}
#define	DEF_CMD_OPTARG(name, func) {		\
    .c_name = (name),				\
    .c_parameter = OPTARG,			\
    .c_u = { .c_func = (func) },		\
    .c_iscloneop = 0,				\
    .c_next = NULL,				\
}
#define	DEF_CMD_ARG2(name, func) {		\
    .c_name = (name),				\
    .c_parameter = NEXTARG2,			\
    .c_u = { .c_func2 = (func) },		\
    .c_iscloneop = 0,				\
    .c_next = NULL,				\
}
#define	DEF_CMD_SARG(name, sparam, func) {	\
    .c_name = (name),				\
    .c_parameter = SPARAM,			\
    .c_sparameter = (sparam),			\
    .c_u = { .c_func3 = (func) },		\
    .c_iscloneop = 0,				\
    .c_next = NULL,				\
}
#define	DEF_CLONE_CMD(name, param, func) {	\
    .c_name = (name),				\
    .c_parameter = (param),			\
    .c_u = { .c_func = (func) },		\
    .c_iscloneop = 1,				\
    .c_next = NULL,				\
}
#define	DEF_CLONE_CMD_ARG(name, func) {		\
    .c_name = (name),				\
    .c_parameter = NEXTARG,			\
    .c_u = { .c_func = (func) },		\
    .c_iscloneop = 1,				\
    .c_next = NULL,				\
}
#define	DEF_CLONE_CMD_ARG2(name, func) {	\
    .c_name = (name),				\
    .c_parameter = NEXTARG2,			\
    .c_u = { .c_func2 = (func) },		\
    .c_iscloneop = 1,				\
    .c_next = NULL,				\
}

#define	ioctl_ctx(ctx, _req, ...)	ioctl((ctx)->io_s, _req, ## __VA_ARGS__)
int ioctl_ctx_ifr(if_ctx *ctx, unsigned long cmd, struct ifreq *ifr);

struct ifaddrs;
struct addrinfo;

enum {
	RIDADDR = 0,
	ADDR = 1,
	MASK = 2,
	DSTADDR = 3,
#ifdef WITHOUT_NETLINK
	BRDADDR = 3,
#else
	BRDADDR = 4,
#endif
};

struct snl_parsed_addr;
struct snl_parsed_link;
typedef struct snl_parsed_link if_link_t;
typedef struct snl_parsed_addr if_addr_t;

typedef void af_setvhid_f(int vhid);
typedef	void af_status_nl_f(if_ctx *ctx, if_link_t *link, if_addr_t *ifa);
typedef void af_status_f(if_ctx *ctx, const struct ifaddrs *);
typedef void af_other_status_f(if_ctx *ctx);
typedef void af_postproc_f(if_ctx *ctx, int newaddr, int ifflags);
typedef	int af_exec_f(if_ctx *ctx, unsigned long action, void *data);
typedef void af_copyaddr_f(if_ctx *ctx, int to, int from);
typedef void af_status_tunnel_f(if_ctx *ctx);
typedef void af_settunnel_f(if_ctx *ctx, struct addrinfo *srcres, struct addrinfo *dstres);

struct afswtch {
	const char	*af_name;	/* as given on cmd line, e.g. "inet" */
	short		af_af;		/* AF_* */
	/*
	 * Status is handled one of two ways; if there is an
	 * address associated with the interface then the
	 * associated address family af_status method is invoked
	 * with the appropriate addressin info.  Otherwise, if
	 * all possible info is to be displayed and af_other_status
	 * is defined then it is invoked after all address status
	 * is presented.
	 */
#ifndef WITHOUT_NETLINK
	af_status_nl_f	*af_status;
#else
	af_status_f	*af_status;
#endif
	af_other_status_f	*af_other_status;
	void		(*af_getaddr)(const char *, int);
	af_copyaddr_f	*af_copyaddr;	/* Copy address between <RID|*>ADDR */
					/* parse prefix method (IPv6) */
	void		(*af_getprefix)(const char *, int);
	af_postproc_f	*af_postproc;
	af_setvhid_f	*af_setvhid;	/* Set CARP vhid for an address */
	af_exec_f	*af_exec;	/* Handler to interact with kernel */
	u_long		af_difaddr;	/* set dst if address ioctl */
	u_long		af_aifaddr;	/* set if address ioctl */
	void		*af_ridreq;	/* */
	void		*af_addreq;	/* */
	struct afswtch	*af_next;

	/* XXX doesn't fit model */
	af_status_tunnel_f	*af_status_tunnel;
	af_settunnel_f	*af_settunnel;
};
void	af_register(struct afswtch *);
int	af_exec_ioctl(if_ctx *ctx, unsigned long action, void *data);

struct ifconfig_args {
	bool all;		/* Match everything */
	bool downonly;		/* Down-only items */
	bool uponly;		/* Up-only items */
	bool namesonly;		/* Output only names */
	bool noload;		/* Do not load relevant kernel modules */
	bool supmedia;		/* Supported media */
	bool printkeys;		/* Print security keys */
	bool allfamilies;	/* Print all families */
	int verbose;		/* verbosity level */
	int argc;
	char **argv;
	const char *ifname;	/* Requested interface name */
	const char *matchgroup;		/* Group name to match */
	const char *nogroup;		/* Group name to exclude */
	const struct afswtch *afp;	/* AF we're operating on */
	const char *jail_name;	/* Jail name or jail id specified */
};

struct option {
	const char *opt;
	const char *opt_usage;
	void	(*cb)(const char *arg);
	struct option *next;
};
void	opt_register(struct option *);

extern	ifconfig_handle_t *lifh;
extern	int allmedia;
extern	int exit_code;
extern	char *f_inet, *f_inet6, *f_ether, *f_addr;

void	clearifcap(if_ctx *ctx, const char *, int value);
void	setifcap(if_ctx *ctx, const char *, int value);
void	setifcapnv(if_ctx *ctx, const char *vname, const char *arg);

void	Perror(const char *cmd);
void	printb(const char *s, unsigned value, const char *bits);

void	ifmaybeload(struct ifconfig_args *args, const char *name);

typedef int  clone_match_func(const char *);
typedef void clone_callback_func(if_ctx *, struct ifreq *);
void	clone_setdefcallback_prefix(const char *, clone_callback_func *);
void	clone_setdefcallback_filter(clone_match_func *, clone_callback_func *);

void	sfp_status(if_ctx *ctx);

struct sockaddr_dl;
bool	match_ether(const struct sockaddr_dl *sdl);
bool	match_if_flags(struct ifconfig_args *args, int if_flags);
int	ifconfig_ioctl(if_ctx *ctx, int iscreate, const struct afswtch *uafp);
bool	group_member(const char *ifname, const char *match, const char *nomatch);
void	tunnel_status(if_ctx *ctx);
struct afswtch	*af_getbyfamily(int af);
void	af_other_status(if_ctx *ctx);
void	print_ifstatus(if_ctx *ctx);
void	print_metric(if_ctx *ctx);

/* Netlink-related functions */
void	list_interfaces_nl(struct ifconfig_args *args);
int	ifconfig_nl(if_ctx *ctx, int iscreate,
		const struct afswtch *uafp);
uint32_t if_nametoindex_nl(struct snl_state *ss, const char *ifname);

/*
 * XXX expose this so modules that need to know of any pending
 * operations on ifmedia can avoid cmd line ordering confusion.
 */
struct ifmediareq *ifmedia_getstate(if_ctx *ctx);

void print_vhid(const struct ifaddrs *);

void ifcreate_ioctl(if_ctx *ctx, struct ifreq *ifr);

/* Helpers */
struct sockaddr_in;
struct sockaddr_in6;
struct sockaddr;

static inline struct sockaddr_in6 *
satosin6(struct sockaddr *sa)
{
	return ((struct sockaddr_in6 *)(void *)sa);
}

static inline struct sockaddr_in *
satosin(struct sockaddr *sa)
{
	return ((struct sockaddr_in *)(void *)sa);
}

static inline struct sockaddr_dl *
satosdl(struct sockaddr *sa)
{
	return ((struct sockaddr_dl *)(void *)sa);
}

static inline const struct sockaddr_dl *
satosdl_c(const struct sockaddr *sa)
{
	return ((const struct sockaddr_dl *)(const void *)sa);
}