/*
 * dhcpcd - DHCP client daemon
 * Copyright 2006-2008 Roy Marples <roy@marples.name>
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
 */

#ifndef INTERFACE_H
#define INTERFACE_H

#include <sys/types.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <limits.h>
#include <stdbool.h>

#include "config.h"

#ifdef __linux__
#  include <linux/netlink.h>
#endif

#ifdef ENABLE_DUID
#ifndef DUID_LEN
#  define DUID_LEN				128 + 2
#endif
#endif

#define EUI64_ADDR_LEN			8
#define INFINIBAND_ADDR_LEN		20

/* Linux 2.4 doesn't define this */
#ifndef ARPHRD_IEEE1394
#  define ARPHRD_IEEE1394		24
#endif

/* The BSD's don't define this yet */
#ifndef ARPHRD_INFINIBAND
#  define ARPHRD_INFINIBAND		32
#endif

#define HWADDR_LEN			20

/* Work out if we have a private address or not
 * 10/8
 * 172.16/12
 * 192.168/16
 */
#ifndef IN_PRIVATE
# define IN_PRIVATE(addr) (((addr & IN_CLASSA_NET) == 0x0a000000) || \
			   ((addr & 0xfff00000)    == 0xac100000) || \
			   ((addr & IN_CLASSB_NET) == 0xc0a80000))
#endif

#define LINKLOCAL_ADDR	0xa9fe0000
#define LINKLOCAL_MASK	0xffff0000
#define LINKLOCAL_BRDC	0xa9feffff

#ifndef IN_LINKLOCAL
# define IN_LINKLOCAL(addr) ((addr & IN_CLASSB_NET) == LINKLOCAL_ADDR)
#endif

#ifndef STAILQ_ENTRY
# error "your sys/queue.h is too old and lacks STAILQ"
#endif

#define NSTAILQ_FOREACH(var, head, field) \
		if (head) STAILQ_FOREACH (var, head, field)

typedef struct route_t
{
  struct in_addr destination;
  struct in_addr netmask;
  struct in_addr gateway;
  STAILQ_ENTRY (route_t) entries;
} route_t;
STAILQ_HEAD (route_head, route_t);

typedef struct address_t
{
  struct in_addr address;
  STAILQ_ENTRY (address_t) entries;
} address_t;
STAILQ_HEAD (address_head, address_t);

typedef struct interface_t
{
  char name[IF_NAMESIZE];
  sa_family_t family;
  unsigned char hwaddr[HWADDR_LEN];
  size_t hwlen;
  bool arpable;
  unsigned short mtu;

  int fd;
  size_t buffer_length;

#ifdef __linux__
  int listen_fd;
  int socket_protocol;
#endif

  char infofile[PATH_MAX];

  unsigned short previous_mtu;
  struct in_addr previous_address;
  struct in_addr previous_netmask;
  struct route_head *previous_routes;

  time_t start_uptime;

  unsigned char *clientid;
  size_t clientid_len;
} interface_t;

void free_address (struct address_head *addresses);
void free_route (struct route_head *routes);
uint32_t get_netmask (uint32_t addr);
char *hwaddr_ntoa (const unsigned char *hwaddr, size_t hwlen);
size_t hwaddr_aton (unsigned char *hwaddr, const char *addr);

interface_t *read_interface (const char *ifname, int metric);
int get_mtu (const char *ifname);
int set_mtu (const char *ifname, short int mtu);

int add_address (const char *ifname, struct in_addr address,
                 struct in_addr netmask, struct in_addr broadcast);
int del_address (const char *ifname, struct in_addr address,
                 struct in_addr netmask);

int flush_addresses (const char *ifname);
in_addr_t get_address (const char *ifname);
int has_address (const char *ifname, struct in_addr address);

int add_route (const char *ifname, struct in_addr destination,
               struct in_addr netmask, struct in_addr gateway, int metric);
int change_route (const char *ifname, struct in_addr destination,
                  struct in_addr netmask, struct in_addr gateway, int metric);
int del_route (const char *ifname, struct in_addr destination,
               struct in_addr netmask, struct in_addr gateway, int metric);

int inet_ntocidr (struct in_addr address);
int inet_cidrtoaddr (int cidr, struct in_addr *addr);

#ifdef __linux__
typedef int (*netlink_callback) (struct nlmsghdr *hdr, void *arg);
int send_netlink (struct nlmsghdr *hdr, netlink_callback callback, void *arg);
#endif
#endif