/*
 * RIPng related value and structure.
 * Copyright (C) 1998 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_RIPNG_RIPNGD_H
#define _ZEBRA_RIPNG_RIPNGD_H

#include <zclient.h>
#include <vty.h>

/* RIPng version and port number. */
#define RIPNG_V1                         1
#define RIPNG_PORT_DEFAULT             521
#define RIPNG_VTY_PORT                2603
#define RIPNG_MAX_PACKET_SIZE         1500
#define RIPNG_PRIORITY_DEFAULT           0

/* RIPng commands. */
#define RIPNG_REQUEST                    1
#define RIPNG_RESPONSE                   2

/* RIPng metric and multicast group address. */
#define RIPNG_METRIC_INFINITY           16
#define RIPNG_METRIC_NEXTHOP          0xff
#define RIPNG_GROUP              "ff02::9"

/* RIPng timers. */
#define RIPNG_UPDATE_TIMER_DEFAULT      30
#define RIPNG_TIMEOUT_TIMER_DEFAULT    180
#define RIPNG_GARBAGE_TIMER_DEFAULT    120

/* RIPng peer timeout value. */
#define RIPNG_PEER_TIMER_DEFAULT       180

/* Default config file name. */
#define RIPNG_DEFAULT_CONFIG "ripngd.conf"

/* RIPng route types. */
#define RIPNG_ROUTE_RTE                  0
#define RIPNG_ROUTE_STATIC               1
#define RIPNG_ROUTE_DEFAULT              2
#define RIPNG_ROUTE_REDISTRIBUTE         3
#define RIPNG_ROUTE_INTERFACE            4
#define RIPNG_ROUTE_AGGREGATE            5

/* Interface send/receive configuration. */
#define RIPNG_SEND_UNSPEC                0
#define RIPNG_SEND_OFF                   1
#define RIPNG_RECEIVE_UNSPEC             0
#define RIPNG_RECEIVE_OFF                1

/* RIP default route's accept/announce methods. */
#define RIPNG_DEFAULT_ADVERTISE_UNSPEC   0
#define RIPNG_DEFAULT_ADVERTISE_NONE     1
#define RIPNG_DEFAULT_ADVERTISE          2

#define RIPNG_DEFAULT_ACCEPT_UNSPEC      0
#define RIPNG_DEFAULT_ACCEPT_NONE        1
#define RIPNG_DEFAULT_ACCEPT             2

/* Default value for "default-metric" command. */
#define RIPNG_DEFAULT_METRIC_DEFAULT     1

/* For max RTE calculation. */
#ifndef IPV6_HDRLEN
#define IPV6_HDRLEN 40
#endif /* IPV6_HDRLEN */

#ifndef IFMINMTU
#define IFMINMTU    576
#endif /* IFMINMTU */

/* RIPng structure. */
struct ripng 
{
  /* RIPng socket. */
  int sock;

  /* RIPng Parameters.*/
  u_char command;
  u_char version;
  unsigned long update_time;
  unsigned long timeout_time;
  unsigned long garbage_time;
  int max_mtu;
  int default_metric;
  int default_information;

  /* Input/output buffer of RIPng. */
  struct stream *ibuf;
  struct stream *obuf;

  /* RIPng routing information base. */
  struct route_table *table;

  /* RIPng only static route information. */
  struct route_table *route;

  /* RIPng aggregate route information. */
  struct route_table *aggregate;

  /* RIPng threads. */
  struct thread *t_read;
  struct thread *t_write;
  struct thread *t_update;
  struct thread *t_garbage;
  struct thread *t_zebra;

  /* Triggered update hack. */
  int trigger;
  struct thread *t_triggered_update;
  struct thread *t_triggered_interval;

  /* RIPng ECMP flag */
  unsigned int ecmp;

  /* For redistribute route map. */
  struct
  {
    char *name;
    struct route_map *map;
    int metric_config;
    u_int32_t metric;
  } route_map[ZEBRA_ROUTE_MAX];
};

/* Routing table entry. */
struct rte
{
  struct in6_addr addr;	/* RIPng destination prefix */
  u_short tag;		/* RIPng tag */
  u_char prefixlen;	/* Length of the RIPng prefix */
  u_char metric;	/* Metric of the RIPng route */
  			/* The nexthop is stored by the structure
			 * ripng_nexthop within ripngd.c */
};

/* RIPNG send packet. */
struct ripng_packet
{
  u_char command;
  u_char version;
  u_int16_t zero; 
  struct rte rte[1];
};

/* Each route's information. */
struct ripng_info
{
  /* This route's type.  Static, ripng or aggregate. */
  u_char type;

  /* Sub type for static route. */
  u_char sub_type;

  /* RIPng specific information */
  struct in6_addr nexthop;	
  struct in6_addr from;

  /* Which interface does this route come from. */
  ifindex_t ifindex;		

  /* Metric of this route.  */
  u_char metric;		

  /* Tag field of RIPng packet.*/
  u_int16_t tag;		

  /* For aggregation. */
  unsigned int suppress;

  /* Flags of RIPng route. */
#define RIPNG_RTF_FIB      1
#define RIPNG_RTF_CHANGED  2
  u_char flags;

  /* Garbage collect timer. */
  struct thread *t_timeout;
  struct thread *t_garbage_collect;

  /* Route-map features - this variables can be changed. */
  struct in6_addr nexthop_out;
  u_char metric_set;
  u_char metric_out;
  u_short tag_out;

  struct route_node *rp;
};

#ifdef notyet
#if 0
/* RIPng tag structure. */
struct ripng_tag
{
  /* Tag value. */
  u_int16_t tag;

  /* Port. */
  u_int16_t port;

  /* Multicast group. */
  struct in6_addr maddr;

  /* Table number. */
  int table;

  /* Distance. */
  int distance;

  /* Split horizon. */
  u_char split_horizon;

  /* Poison reverse. */
  u_char poison_reverse;
};
#endif /* 0 */
#endif /* not yet */

typedef enum {
  RIPNG_NO_SPLIT_HORIZON = 0,
  RIPNG_SPLIT_HORIZON,
  RIPNG_SPLIT_HORIZON_POISONED_REVERSE
} split_horizon_policy_t;

/* RIPng specific interface configuration. */
struct ripng_interface
{
  /* RIPng is enabled on this interface. */
  int enable_network;
  int enable_interface;

  /* RIPng is running on this interface. */
  int running;

  /* Split horizon flag. */
  split_horizon_policy_t split_horizon;
  split_horizon_policy_t split_horizon_default;
  
  /* For filter type slot. */
#define RIPNG_FILTER_IN  0
#define RIPNG_FILTER_OUT 1
#define RIPNG_FILTER_MAX 2

  /* Access-list. */
  struct access_list *list[RIPNG_FILTER_MAX];

  /* Prefix-list. */
  struct prefix_list *prefix[RIPNG_FILTER_MAX];

  /* Route-map. */
  struct route_map *routemap[RIPNG_FILTER_MAX];

#ifdef notyet
#if 0
  /* RIPng tag configuration. */
  struct ripng_tag *rtag;
#endif /* 0 */
#endif /* notyet */

  /* Default information originate. */
  u_char default_originate;

  /* Default information only. */
  u_char default_only;

  /* Wake up thread. */
  struct thread *t_wakeup;

  /* Passive interface. */
  int passive;
};

/* RIPng peer information. */
struct ripng_peer
{
  /* Peer address. */
  struct in6_addr addr;

  /* Peer RIPng tag value. */
  int domain;

  /* Last update time. */
  time_t uptime;

  /* Peer RIP version. */
  u_char version;

  /* Statistics. */
  int recv_badpackets;
  int recv_badroutes;

  /* Timeout thread. */
  struct thread *t_timeout;
};

/* All RIPng events. */
enum ripng_event
{
  RIPNG_READ,
  RIPNG_ZEBRA,
  RIPNG_REQUEST_EVENT,
  RIPNG_UPDATE_EVENT,
  RIPNG_TRIGGERED_UPDATE,
};

/* RIPng timer on/off macro. */
#define RIPNG_TIMER_ON(T,F,V) \
do { \
   if (!(T)) \
      (T) = thread_add_timer (master, (F), rinfo, (V)); \
} while (0)

#define RIPNG_TIMER_OFF(T) \
do { \
   if (T) \
     { \
       thread_cancel(T); \
       (T) = NULL; \
     } \
} while (0)

/* Count prefix size from mask length */
#define PSIZE(a) (((a) + 7) / (8))

/* Extern variables. */
extern struct ripng *ripng;

extern struct thread_master *master;

/* Prototypes. */
extern void ripng_init (void);
extern void ripng_reset (void);
extern void ripng_clean (void);
extern void ripng_clean_network (void);
extern void ripng_interface_clean (void);
extern void ripng_interface_reset (void);
extern void ripng_passive_interface_clean (void);
extern void ripng_if_init (void);
extern void ripng_route_map_init (void);
extern void ripng_route_map_reset (void);
extern void ripng_terminate (void);
 /* zclient_init() is done by ripng_zebra.c:zebra_init() */
extern void zebra_init (struct thread_master *);
extern void ripng_zclient_start (void);
extern void ripng_zclient_reset (void);
extern void ripng_offset_init (void);

extern int config_write_ripng_offset_list (struct vty *);

extern void ripng_peer_init (void);
extern void ripng_peer_update (struct sockaddr_in6 *, u_char);
extern void ripng_peer_bad_route (struct sockaddr_in6 *);
extern void ripng_peer_bad_packet (struct sockaddr_in6 *);
extern void ripng_peer_display (struct vty *);
extern struct ripng_peer *ripng_peer_lookup (struct in6_addr *);
extern struct ripng_peer *ripng_peer_lookup_next (struct in6_addr *);

extern int ripng_offset_list_apply_in (struct prefix_ipv6 *,
                                       struct interface *, u_char *);
extern int ripng_offset_list_apply_out (struct prefix_ipv6 *,
                                        struct interface *, u_char *);
extern void ripng_offset_clean (void);

extern struct ripng_info * ripng_info_new (void);
extern void ripng_info_free (struct ripng_info *rinfo);
extern void ripng_event (enum ripng_event, int);
extern int ripng_request (struct interface *ifp);
extern void ripng_redistribute_add (int, int, struct prefix_ipv6 *,
                                    ifindex_t, struct in6_addr *);
extern void ripng_redistribute_delete (int, int, struct prefix_ipv6 *,
                                       ifindex_t);
extern void ripng_redistribute_withdraw (int type);

extern void ripng_distribute_update_interface (struct interface *);
extern void ripng_if_rmap_update_interface (struct interface *);

extern void ripng_zebra_ipv6_add (struct route_node *);
extern void ripng_zebra_ipv6_delete (struct route_node *);

extern void ripng_redistribute_clean (void);
extern int ripng_redistribute_check (int);
extern void ripng_redistribute_write (struct vty *, int);

extern int ripng_write_rte (int num, struct stream *s, struct prefix_ipv6 *p,
                            struct in6_addr *nexthop,
                            u_int16_t tag, u_char metric);
extern int ripng_send_packet (caddr_t buf, int bufsize,
                              struct sockaddr_in6 *to, struct interface *ifp);

extern void ripng_packet_dump (struct ripng_packet *packet, int size,
                               const char *sndrcv);

extern int ripng_interface_up (int command, struct zclient *, zebra_size_t,
    vrf_id_t);
extern int ripng_interface_down (int command, struct zclient *, zebra_size_t,
    vrf_id_t);
extern int ripng_interface_add (int command, struct zclient *, zebra_size_t,
    vrf_id_t);
extern int ripng_interface_delete (int command, struct zclient *, zebra_size_t,
    vrf_id_t);
extern int ripng_interface_address_add (int command, struct zclient *, zebra_size_t,
    vrf_id_t);
extern int ripng_interface_address_delete (int command, struct zclient *, zebra_size_t,
    vrf_id_t);

extern int ripng_network_write (struct vty *, int);

extern struct ripng_info *ripng_ecmp_add (struct ripng_info *);
extern struct ripng_info *ripng_ecmp_replace (struct ripng_info *);
extern struct ripng_info *ripng_ecmp_delete (struct ripng_info *);

#endif /* _ZEBRA_RIPNG_RIPNGD_H */