/* Interface related header.
   Copyright (C) 1997, 98, 99 Kunihiro Ishiguro

This file is part of GNU Zebra.

GNU Zebra is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2, or (at your
option) any later version.

GNU Zebra is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Zebra; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#ifndef _ZEBRA_IF_H
#define _ZEBRA_IF_H

#include "linklist.h"

/*
  Interface name length.

   Linux define value in /usr/include/linux/if.h.
   #define IFNAMSIZ        16

   FreeBSD define value in /usr/include/net/if.h.
   #define IFNAMSIZ        16
*/

#define INTERFACE_NAMSIZ      20
#define INTERFACE_HWADDR_MAX  20

#ifdef HAVE_PROC_NET_DEV
struct if_stats
{
  unsigned long rx_packets;   /* total packets received       */
  unsigned long tx_packets;   /* total packets transmitted    */
  unsigned long rx_bytes;     /* total bytes received         */
  unsigned long tx_bytes;     /* total bytes transmitted      */
  unsigned long rx_errors;    /* bad packets received         */
  unsigned long tx_errors;    /* packet transmit problems     */
  unsigned long rx_dropped;   /* no space in linux buffers    */
  unsigned long tx_dropped;   /* no space available in linux  */
  unsigned long rx_multicast; /* multicast packets received   */
  unsigned long rx_compressed;
  unsigned long tx_compressed;
  unsigned long collisions;

  /* detailed rx_errors: */
  unsigned long rx_length_errors;
  unsigned long rx_over_errors;       /* receiver ring buff overflow  */
  unsigned long rx_crc_errors;        /* recved pkt with crc error    */
  unsigned long rx_frame_errors;      /* recv'd frame alignment error */
  unsigned long rx_fifo_errors;       /* recv'r fifo overrun          */
  unsigned long rx_missed_errors;     /* receiver missed packet     */
  /* detailed tx_errors */
  unsigned long tx_aborted_errors;
  unsigned long tx_carrier_errors;
  unsigned long tx_fifo_errors;
  unsigned long tx_heartbeat_errors;
  unsigned long tx_window_errors;
};
#endif /* HAVE_PROC_NET_DEV */

/* Interface structure */
struct interface 
{
  /* Interface name.  This should probably never be changed after the
     interface is created, because the configuration info for this interface
     is associated with this structure.  For that reason, the interface
     should also never be deleted (to avoid losing configuration info).
     To delete, just set ifindex to IFINDEX_INTERNAL to indicate that the
     interface does not exist in the kernel.
   */
  char name[INTERFACE_NAMSIZ + 1];

  /* Interface index (should be IFINDEX_INTERNAL for non-kernel or
     deleted interfaces). */
  unsigned int ifindex;
#define IFINDEX_INTERNAL	0

  /* Zebra internal interface status */
  u_char status;
#define ZEBRA_INTERFACE_ACTIVE     (1 << 0)
#define ZEBRA_INTERFACE_SUB        (1 << 1)
#define ZEBRA_INTERFACE_LINKDETECTION (1 << 2)
  
  /* Interface flags. */
  unsigned long flags;

  /* Interface metric */
  int metric;

  /* Interface MTU. */
  unsigned int mtu;    /* IPv4 MTU */
  unsigned int mtu6;   /* IPv6 MTU - probably, but not neccessarily same as mtu */

  /* Hardware address. */
#ifdef HAVE_SOCKADDR_DL
  struct sockaddr_dl sdl;
#else
  unsigned short hw_type;
  u_char hw_addr[INTERFACE_HWADDR_MAX];
  int hw_addr_len;
#endif /* HAVE_SOCKADDR_DL */

  /* interface bandwidth, kbits */
  unsigned int bandwidth;
  
  /* description of the interface. */
  char *desc;			

  /* Distribute list. */
  void *distribute_in;
  void *distribute_out;

  /* Connected address list. */
  struct list *connected;

  /* Daemon specific interface data pointer. */
  void *info;

  /* Statistics fileds. */
#ifdef HAVE_PROC_NET_DEV
  struct if_stats stats;
#endif /* HAVE_PROC_NET_DEV */  
#ifdef HAVE_NET_RT_IFLIST
  struct if_data stats;
#endif /* HAVE_NET_RT_IFLIST */
};

/* Connected address structure. */
struct connected
{
  /* Attached interface. */
  struct interface *ifp;

  /* Flags for configuration. */
  u_char conf;
#define ZEBRA_IFC_REAL         (1 << 0)
#define ZEBRA_IFC_CONFIGURED   (1 << 1)

  /* Flags for connected address. */
  u_char flags;
#define ZEBRA_IFA_SECONDARY   (1 << 0)

  /* Address of connected network. */
  struct prefix *address;
  struct prefix *destination; /* broadcast or peer address; may be NULL */

  /* Label for Linux 2.2.X and upper. */
  char *label;
};

/* Given an IPV4 struct connected, this macro determines whether a /32
   peer address has been supplied (i.e. there is no subnet assigned) */
#define CONNECTED_DEST_HOST(C) \
	((C)->destination && ((C)->address->prefixlen == IPV4_MAX_PREFIXLEN))

/* Given an IPV4 struct connected, this macro determins whether it is
   a point-to-point link with a /32 peer address (i.e. there
   is no dedicated subnet for the PtP link) */
#define CONNECTED_POINTOPOINT_HOST(C) \
	(((C)->ifp->flags & IFF_POINTOPOINT) && CONNECTED_DEST_HOST(C))

/* Interface hook sort. */
#define IF_NEW_HOOK   0
#define IF_DELETE_HOOK 1

/* There are some interface flags which are only supported by some
   operating system. */

#ifndef IFF_NOTRAILERS
#define IFF_NOTRAILERS 0x0
#endif /* IFF_NOTRAILERS */
#ifndef IFF_OACTIVE
#define IFF_OACTIVE 0x0
#endif /* IFF_OACTIVE */
#ifndef IFF_SIMPLEX
#define IFF_SIMPLEX 0x0
#endif /* IFF_SIMPLEX */
#ifndef IFF_LINK0
#define IFF_LINK0 0x0
#endif /* IFF_LINK0 */
#ifndef IFF_LINK1
#define IFF_LINK1 0x0
#endif /* IFF_LINK1 */
#ifndef IFF_LINK2
#define IFF_LINK2 0x0
#endif /* IFF_LINK2 */
#ifndef IFF_NOXMIT
#define IFF_NOXMIT 0x0
#endif /* IFF_NOXMIT */
#ifndef IFF_NORTEXCH
#define IFF_NORTEXCH 0x0
#endif /* IFF_NORTEXCH */
#ifndef IFF_IPV4
#define IFF_IPV4 0x0
#endif /* IFF_IPV4 */
#ifndef IFF_IPV6
#define IFF_IPV6 0x0
#endif /* IFF_IPV6 */
#ifndef IFF_VIRTUAL
#define IFF_VIRTUAL 0x0
#endif /* IFF_VIRTUAL */

/* Prototypes. */
int if_cmp_func (struct interface *, struct interface *);
struct interface *if_create (const char *name, int namelen);
struct interface *if_lookup_by_index (unsigned int);
struct interface *if_lookup_exact_address (struct in_addr);
struct interface *if_lookup_address (struct in_addr);

/* Currently, the code assumes that the interface name arguments to these
   functions have length <= INTERFACE_NAMSIZ, and they must be NUL-terminated
   if they are shorter than INTERFACE_NAMSIZ.  After code cleanup, the
   implementation will be changed to require the arguments to these functions
   to terminate with a NUL character (no length limitation). */
struct interface *if_lookup_by_name (const char *);
struct interface *if_get_by_name (const char *);

/* For these 2 functions, the 2nd argument should be the precise length
   of the interface name (not counting a trailing NUL which may or may
   not be present). */
extern struct interface *if_lookup_by_name_len(const char *name,
					       size_t namelen);
extern struct interface *if_get_by_name_len(const char *name, size_t namelen);


/* Delete the interface, but do not free the structure, and leave it in the
   interface list.  It is often advisable to leave the pseudo interface 
   structure because there may be configuration information attached. */
extern void if_delete_retain (struct interface *);

/* Delete and free the interface structure: calls if_delete_retain and then
   deletes it from the interface list and frees the structure. */
extern void if_delete (struct interface *);

int if_is_up (struct interface *);
int if_is_running (struct interface *);
int if_is_operative (struct interface *);
int if_is_loopback (struct interface *);
int if_is_broadcast (struct interface *);
int if_is_pointopoint (struct interface *);
int if_is_multicast (struct interface *);
void if_add_hook (int, int (*)(struct interface *));
void if_init ();
void if_dump_all ();
extern const char *if_flag_dump(unsigned long);

/* Please use ifindex2ifname instead of if_indextoname where possible;
   ifindex2ifname uses internal interface info, whereas if_indextoname must
   make a system call. */
extern char *ifindex2ifname (unsigned int);

/* Please use ifname2ifindex instead of if_nametoindex where possible;
   ifname2ifindex uses internal interface info, whereas if_nametoindex must
   make a system call. */
extern unsigned int ifname2ifindex(const char *ifname);

/* Connected address functions. */
struct connected *connected_new ();
void connected_free (struct connected *);
void connected_add (struct interface *, struct connected *);
struct connected  *connected_add_by_prefix (struct interface *,
                                            struct prefix *,
                                            struct prefix *);
struct connected  *connected_delete_by_prefix (struct interface *, 
                                               struct prefix *);
struct connected  *connected_lookup_address (struct interface *, 
                                             struct in_addr);

#ifndef HAVE_IF_NAMETOINDEX
unsigned int if_nametoindex (const char *);
#endif
#ifndef HAVE_IF_INDEXTONAME
char *if_indextoname (unsigned int, char *);
#endif

/* Exported variables. */
extern struct list *iflist;
extern struct cmd_element interface_desc_cmd;
extern struct cmd_element no_interface_desc_cmd;
extern struct cmd_element interface_cmd;
extern struct cmd_element no_interface_cmd;
extern struct cmd_element interface_pseudo_cmd;
extern struct cmd_element no_interface_pseudo_cmd;

#endif /* _ZEBRA_IF_H */