/*
 *	BIRD -- OSPF
 *
 *	(c) 1999 Ondrej Filip <feela@network.cz>
 *
 *	Can be freely distributed and used under the terms of the GNU GPL.
 */

#ifndef _BIRD_OSPF_H_
#define _BIRD_OSPF_H_


#define SIPH 64		/* FIXME Size Of IP header */

#include "nest/bird.h"

#include "lib/checksum.h"
#include "lib/ip.h"
#include "lib/lists.h"
#include "lib/slists.h"
#include "lib/socket.h"
#include "lib/timer.h"
#include "lib/resource.h"
#include "nest/protocol.h"
#include "nest/iface.h"
#include "nest/route.h"
#include "conf/conf.h"
#include "lib/string.h"

#define OSPF_PROTO 89
#ifndef IPV6
#define OSPF_VERSION 2
#define AllSPFRouters ipa_from_u32(0xe0000005)	/* 224.0.0.5 */
#define AllDRouters ipa_from_u32(0xe0000006)	/* 224.0.0.6 */
#define DEFAULTDES ipa_from_u32(0)
#else
#error Multicast address not defined in IPv6
#endif


#define LSREFRESHTIME 1800	/* 30 minutes */
#define MINLSINTERVAL 5
#define MINLSARRIVAL 1
#define LSINFINITY 0xffff	/* RFC says 0xffffff ??? */
#define DISPTICK 7		/* FIXME What's good value? */

struct ospf_config {
  struct proto_config c;
  u32 area;		/* FIXME: Area ID  !!! This is wrong !!!
                         * Should respect interface */
};

struct ospf_iface {
  node n;
  struct proto_ospf *proto;
  struct iface *iface;	/* Nest's iface */
  struct ospf_area *oa;
  u32 an;		/* Area number */
  sock *hello_sk;	/* Hello socket */
  sock *dr_sk;		/* For states DR or BACKUP */
  sock *ip_sk;		/* IP socket (for DD ...) */
  list neigh_list;	/* List of neigbours */
  u16 cost;		/* Cost of iface */
  u16 rxmtint;		/* number of seconds between LSA retransmissions */
  u16 inftransdelay;	/* The estimated number of seconds it takes to
			   transmit a Link State Update Packet over this
			   interface.  LSAs contained in the update */
  u8 priority;		/* A router priority for DR election */
  u16 helloint;		/* number of seconds between hello sending */
  u16 waitint;		/* number of sec before changing state from wait */
  u32 deadc;		/* after "deadint" missing hellos is router dead */
  u16 autype;
  u8 aukey[8];
  u8 options;
  ip_addr drip;		/* Designated router */
  u32 drid;
  ip_addr bdrip;	/* Backup DR */
  u32 bdrid;
  u8 type;		/* OSPF view of type */
#define OSPF_IT_BCAST 0
#define OSPF_IT_NBMA 1
#define OSPF_IT_PTP 2
#define OSPF_IT_VLINK 3
  u8 state;		/* Interface state machine */
#define OSPF_IS_DOWN 0		/* Not working */
#define OSPF_IS_LOOP 1		/* Should never happen */
#define OSPF_IS_WAITING 2	/* Waiting for Wait timer */
#define OSPF_IS_PTP 3		/* PTP operational */
#define OSPF_IS_DROTHER 4	/* I'm on BCAST or NBMA and I'm not DR */
#define OSPF_IS_BACKUP 5	/* I'm BDR */
#define OSPF_IS_DR 6		/* I'm DR */
  timer *wait_timer;		/* WAIT timer */
  timer *hello_timer;		/* HELLOINT timer */
/* Default values for interface parameters */
#define COST_D 10
#define RXMTINT_D 5
#define INFTRANSDELAY_D 1
#define PRIORITY_D 1
#define HELLOINT_D 10
#define DEADC_D 4
#define WAIT_DMH 3	/* Value of Wait timer - not found it in RFC 
			 * - using 3*HELLO
			 */
  struct top_hash_entry *nlsa;	/* Originated net lsa */
  int fadj;		/* Number of full adjacent neigh */
};

struct ospf_packet {
  u8 version;
  u8 type;
#define HELLO 1 /* Hello */
#define DBDES 2 /* Database description */
#define LSREQ 3 /* Link state request */
#define LSUPD 4 /* Link state update */
#define LSACK 5 /* Link state acknowledgement */
  u16 length;
  u32 routerid;
  u32 areaid;
#define BACKBONE 0
  u16 checksum;
  u16 autype;
  u8 authetication[8];
};

struct ospf_hello_packet {
  struct ospf_packet ospf_packet;
  ip_addr netmask;
  u16 helloint;
  u8 options;
  u8 priority;
  u32 deadint;
  u32 dr;
  u32 bdr;
};

struct immsb {
  u8 ms:1;
  u8 m:1;
  u8 i:1;
  u8 padding:5;
};

union imms {
  u8 byte;
  struct immsb bit;
};

struct ospf_dbdes_packet {
  struct ospf_packet ospf_packet;
  u16 iface_mtu;
  u8 options;
  union imms imms;		/* I, M, MS bits */
#define DBDES_MS 1
#define DBDES_M 2
#define DBDES_I 4
  u32 ddseq;
};


struct ospf_lsa_header {
  u16 age;	/* LS Age */
#define LSA_MAXAGE 3600                 /* 1 hour */
#define LSA_CHECKAGE 300                /* 5 minutes */
#define LSA_MAXAGEDIFF 900              /* 15 minutes */
  u8 options;
  u8 type;
  u32 id;
#define LSA_T_RT 1
#define LSA_T_NET 2
#define LSA_T_SUM_NET 3
#define LSA_T_SUM_RT 4
#define LSA_T_EXT 5
  u32 rt;		/* Advertising router */
  s32 sn;		/* LS Sequence number */
#define LSA_INITSEQNO 0x80000001
#define LSA_MAXSEQNO 0x7fffffff
  u16 checksum;
  u16 length;  
};

struct ospf_lsa_rt {
  u8 VEB;
#define LSA_RT_V 5
#define LSA_RT_E 6
#define LSA_RT_B 7
  u8 padding;
  u16 links;
};

struct ospf_lsa_rt_link {
  u32 id;
  u32 data;
  u8 type;
#define LSART_PTP 1
#define LSART_NET 2
#define LSART_STUB 3
#define LSART_VLNK 4
  u8 notos;
  u16 metric;
};

struct ospf_lsa_rt_link_tos {	/* Actually we ignore TOS. This is useless */
  u8 tos;
  u8 padding;
  u16 metric;
};

struct ospf_lsa_net {
  ip_addr netmask;
};

struct ospf_lsa_summ {
  ip_addr netmask;
};

struct ospf_lsa_summ_net {
  u8 tos;
  u8 padding;
  u16 metric;
};

struct ospf_lsa_ext {
  ip_addr netmask;
};

struct ospf_lsa_ext_tos {
  u8 etos;
  u8 padding;
  u16 metric;
  ip_addr fwaddr;
  u32 tag;
};

struct ospf_lsreq_packet {
  struct ospf_packet ospf_packet;
};

struct ospf_lsreq_header {
  u16 padd1;
  u8 padd2;
  u8 type;
  u32 id;
  u32 rt;		/* Advertising router */
};

struct l_lsr_head {
  node n;
  struct ospf_lsreq_header lsh;
};

struct ospf_lsupd_packet {
  struct ospf_packet ospf_packet;
  u32 lsano;		/* Number of LSA's */
};

struct ospf_lsack_packet {
  struct ospf_packet ospf_packet;
};


struct ospf_neighbor
{
  node n;
  struct ospf_iface *ifa;
  u8 state;
#define NEIGHBOR_DOWN 0
#define NEIGHBOR_ATTEMPT 1
#define NEIGHBOR_INIT 2
#define NEIGHBOR_2WAY 3
#define NEIGHBOR_EXSTART 4
#define NEIGHBOR_EXCHANGE 5
#define NEIGHBOR_LOADING 6
#define NEIGHBOR_FULL 7
  timer *inactim;	/* Inactivity timer */
  union imms imms;		/* I, M, Master/slave received */
  u32 dds;		/* DD Sequence number being sent */
  u32 ddr;		/* last Dat Des packet received */
  union imms myimms;		/* I, M Master/slave */
  u32 rid;		/* Router ID */
  ip_addr ip;		/* IP of it's interface */
  u8 priority;		/* Priority */
  u8 options;		/* Options received */
  u32 dr;		/* Neigbour's idea of DR */
  u32 bdr;		/* Neigbour's idea of BDR */
  u8 adj;		/* built adjacency? */
  siterator dbsi;	/* Database summary list iterator */
  slist lsrql;		/* Link state request */
  struct top_graph *lsrqh;		/* LSA graph */
  siterator lsrqi;
  slist lsrtl;		/* Link state retransmission list */
  siterator lsrti;
  struct top_graph *lsrth;
  void *ldbdes;		/* Last database description packet */
  timer *rxmt_timer;	/* RXMT timer */
  timer *lsrr_timer;	/* Link state request retransmition timer */
  list ackl;
  timer *ackd_timer;	/* Delayed ack timer */
};

/* Definitions for interface state machine */
#define ISM_UP 0	/* Interface Up */
#define ISM_WAITF 1	/* Wait timer fired */
#define ISM_BACKS 2	/* Backup seen */
#define ISM_NEICH 3	/* Neighbor change */
#define ISM_LOOP 4	/* Loop indicated */
#define ISM_UNLOOP 5	/* Unloop indicated */
#define ISM_DOWN 6	/* Interface down */

/* Definitions for neighbor state machine */
#define INM_HELLOREC 0	/* Hello Received */
#define INM_START 1	/* Neighbor start - for NBMA */
#define INM_2WAYREC 2	/* 2-Way received */
#define INM_NEGDONE 3	/* Negotiation done */
#define INM_EXDONE 4	/* Exchange done */
#define INM_BADLSREQ 5	/* Bad LS Request */
#define INM_LOADDONE 6	/* Load done */
#define INM_ADJOK 7	/* AdjOK? */
#define INM_SEQMIS 8	/* Sequence number mismatch */
#define INM_1WAYREC 9	/* 1-Way */
#define INM_KILLNBR 10	/* Kill Neighbor */
#define INM_INACTTIM 11	/* Inactivity timer */
#define INM_LLDOWN 12	/* Line down */

struct ospf_area {
  node n;
  u32 areaid;
  timer *disp_timer;		/* Area's dispatcher hear beat */
  bird_clock_t lage;		/* Time of last aging */
  int calcrt;			/* Routing table calculation scheduled? */
  int origrt;			/* Rt lsa origination scheduled? */
  struct top_graph *gr;		/* LSA graph */
  slist lsal;			/* List of all LSA's */
  struct top_hash_entry *rt;	/* My own router LSA */
  list cand;			/* List of candidates for RT calc. */
  u8 stub;
  u8 trcap;			/* Transit capability? */
  struct proto_ospf *po;
  struct fib infib;		/* FIB for intra-area routes */
};

struct proto_ospf {
  struct proto proto;
  list iface_list;		/* Interfaces we really use */
  list area_list;
  int areano;			/* Number of area I belong to */
  struct fib efib;		/* FIB for external routes */
};

static int ospf_start(struct proto *p);
static void ospf_dump(struct proto *p);
static struct proto *ospf_init(struct proto_config *c);
static void ospf_preconfig(struct protocol *p, struct config *c);
static void ospf_postconfig(struct proto_config *c);
static int ospf_rte_better(struct rte *new, struct rte *old);
static int ospf_rte_same(struct rte *new, struct rte *old);
int ospf_import_control(struct proto *p, rte **new, ea_list **attrs,
  struct linpool *pool);
struct ea_list *ospf_make_tmp_attrs(struct rte *rt, struct linpool *pool);
void ospf_store_tmp_attrs(struct rte *rt, struct ea_list *attrs);
void ospf_rt_notify(struct proto *p, net *n, rte *new, rte *old,ea_list *attrs);
void area_disp(timer *timer);
void schedule_rt_lsa(struct ospf_area *oa);
void schedule_rtcalc(struct ospf_area *oa);

#define EA_OSPF_METRIC1	EA_CODE(EAP_OSPF, 0)
#define EA_OSPF_METRIC2	EA_CODE(EAP_OSPF, 1)
#define EA_OSPF_TAG	EA_CODE(EAP_OSPF, 2)

#include "proto/ospf/hello.h"
#include "proto/ospf/packet.h"
#include "proto/ospf/iface.h"
#include "proto/ospf/neighbor.h"
#include "proto/ospf/topology.h"
#include "proto/ospf/dbdes.h"
#include "proto/ospf/lsreq.h"
#include "proto/ospf/lsupd.h"
#include "proto/ospf/lsack.h"
#include "proto/ospf/lsalib.h"
#include "proto/ospf/rt.h"

#endif /* _BIRD_OSPF_H_ */