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

#include "ospf.h"

static int
ospf_start(struct proto *p)
{
  struct proto_ospf *po=(struct proto_ospf *)p;
  debug("%s: Start\n",p->name);

  fib_init(&po->efib,p->pool,sizeof(struct extfib),16,init_efib);
  init_list(&(po->iface_list));
  init_list(&(po->area_list));
  po->areano=0;

  return PS_UP;
}

static void
ospf_dump(struct proto *p)
{
  char areastr[20];
  struct ospf_iface *ifa;
  struct ospf_neighbor *n;
  struct ospf_config *c = (void *) p->cf;
  struct proto_ospf *po=(struct proto_ospf *)p;
  struct ospf_area *oa;

  debug("%s: Area number: %d\n", p->name, po->areano);

  WALK_LIST(ifa, po->iface_list)
  {
    debug("%s: Interface: %s\n", p->name, ifa->iface->name);
    debug("%s:  state: %u\n", p->name, ifa->state);
    debug("%s:  DR:  %I\n", p->name, ifa->drid);
    debug("%s:  BDR: %I\n", p->name, ifa->bdrid);
    WALK_LIST(n, ifa->neigh_list)
    {
      debug("%s:   neighbor %I in state %u\n", p->name, n->rid, n->state);
    }
  }

  WALK_LIST(NODE oa,po->area_list)
  {
    debug("\n%s: LSA graph dump for area \"%I\" start:\n", p->name,oa->areaid);
    ospf_top_dump(oa->gr);
    debug("%s: LSA graph dump for area \"%I\" finished\n\n", p->name,
      oa->areaid);
  }
  neigh_dump_all();
}

static struct proto *
ospf_init(struct proto_config *c)
{
  struct proto *p = proto_new(c, sizeof(struct proto_ospf));
  struct proto_ospf *po=(struct proto_ospf *)p;
  struct ospf_config *oc=(struct ospf_config *)c;
  struct ospf_area_config *ac;
  struct ospf_iface_patt *patt;

  debug("OSPF: Init requested.\n");
  p->import_control = ospf_import_control;
  p->make_tmp_attrs = ospf_make_tmp_attrs;
  p->store_tmp_attrs = ospf_store_tmp_attrs;
  p->rt_notify = ospf_rt_notify;
  p->if_notify = ospf_if_notify;
  p->rte_better = ospf_rte_better;
  p->rte_same = ospf_rte_same;

  po->rfc1583=oc->rfc1583;
  WALK_LIST(ac, oc->area_list)
  {
    debug("OSPF: area: %I, stub=%u tick=%u\n", ac->areaid, ac->stub, ac->tick);
    WALK_LIST(patt, ac->patt_list)
      debug("Patt cost=%d hello=%d ret=%d\n",patt->cost, patt->helloint,
        patt->rxmtint);
  }

  return p;
}

/* If new is better return 1 */
static int
ospf_rte_better(struct rte *new, struct rte *old)
{
  struct proto *p = new->attrs->proto;

  if(new->u.ospf.metric1=LSINFINITY) return 0;

  if(((new->attrs->source==RTS_OSPF) || (new->attrs->source==RTS_OSPF_IA))
    && (old->attrs->source==RTS_OSPF_EXT)) return 1;

  if(((old->attrs->source==RTS_OSPF) || (old->attrs->source==RTS_OSPF_IA))
    && (new->attrs->source==RTS_OSPF_EXT)) return 0;

  if(new->u.ospf.metric2!=0)
  {
    if(old->u.ospf.metric2==0) return 0;
    if(new->u.ospf.metric2<old->u.ospf.metric2) return 1;
    return 0;
  }
  else
  {
    if(old->u.ospf.metric2!=0) return 1;
    if(new->u.ospf.metric1<old->u.ospf.metric1) return 1;
    return 0;
  }
}

static int
ospf_rte_same(struct rte *new, struct rte *old)
{
  /* new->attrs == old->attrs always */
  return
    new->u.ospf.metric1 == old->u.ospf.metric1 &&
    new->u.ospf.metric2 == old->u.ospf.metric2 &&
    new->u.ospf.tag     == old->u.ospf.tag;
}

static ea_list *
ospf_build_attrs(ea_list *next, struct linpool *pool, u32 m1, u32 m2, u32 tag)
{
  struct ea_list *l = lp_alloc(pool, sizeof(struct ea_list) + 3*sizeof(eattr));

  l->next = next;
  l->flags = EALF_SORTED;
  l->count = 3;
  l->attrs[0].id = EA_OSPF_METRIC1;
  l->attrs[0].flags = 0;
  l->attrs[0].type = EAF_TYPE_INT | EAF_TEMP;
  l->attrs[0].u.data = m1;
  l->attrs[1].id = EA_OSPF_METRIC2;
  l->attrs[1].flags = 0;
  l->attrs[1].type = EAF_TYPE_INT | EAF_TEMP;
  l->attrs[1].u.data = m2;
  l->attrs[2].id = EA_OSPF_TAG;
  l->attrs[2].flags = 0;
  l->attrs[2].type = EAF_TYPE_INT | EAF_TEMP;
  l->attrs[2].u.data = tag;
  return l;
}

void
schedule_rt_lsa(struct ospf_area *oa)
{
  struct proto_ospf *po=oa->po;
  struct proto *p=&po->proto;

  debug("%s: Scheduling RT lsa origination for area %I.\n", p->name,
    oa->areaid);
  oa->origrt=1;
}

void
schedule_rtcalc(struct ospf_area *oa)
{
  struct proto_ospf *po=oa->po;
  struct proto *p=&po->proto;

  debug("%s: Scheduling RT calculation for area %I.\n", p->name,
    oa->areaid);
  oa->calcrt=1;
}

void
area_disp(timer *timer)
{
  struct ospf_area *oa=timer->data;
  struct top_hash_entry *en,*nxt;

  /* First of all try to age LSA DB */
  ospf_age(oa);

  /* Now try to originage rt_lsa */
  if(oa->origrt) originate_rt_lsa(oa);
  oa->origrt=0;

  if(oa->calcrt) ospf_rt_spfa(oa);
  oa->calcrt=0;
}

int
ospf_import_control(struct proto *p, rte **new, ea_list **attrs, struct linpool *pool)
{
  rte *e=*new;
  struct proto_ospf *po=(struct proto_ospf *)p;

  if(p==e->attrs->proto) return -1;	/* Reject our own routes */
  *attrs = ospf_build_attrs(*attrs, pool, 0, 0, 0); /* FIXME: Use better defaults? */
  return 0;				/* Leave decision to the filters */
}

struct ea_list *
ospf_make_tmp_attrs(struct rte *rt, struct linpool *pool)
{
  return ospf_build_attrs(NULL, pool, rt->u.ospf.metric1, rt->u.ospf.metric2, rt->u.ospf.tag);
}

void
ospf_store_tmp_attrs(struct rte *rt, struct ea_list *attrs)
{
  rt->u.ospf.metric1 = ea_get_int(attrs, EA_OSPF_METRIC1, 0);
  rt->u.ospf.metric2 = ea_get_int(attrs, EA_OSPF_METRIC2, 0);
  rt->u.ospf.tag     = ea_get_int(attrs, EA_OSPF_TAG,     0);
}

static int
ospf_shutdown(struct proto *p)
{
  struct proto_ospf *po=(struct proto_ospf *)p;
  struct ospf_iface *ifa;
  struct ospf_neighbor *n;
  struct ospf_area *oa;
  debug("%s: Shutdown requested\n", p->name);

  /* And send to all my neighbors 1WAY */
  WALK_LIST(ifa, po->iface_list)
  {
    init_list(&ifa->neigh_list);
    hello_timer_hook(ifa->hello_timer);
  }
  
  return PS_DOWN;
}

void
ospf_rt_notify(struct proto *p, net *n, rte *new, rte *old, ea_list *attrs)
{
  struct proto_ospf *po=(struct proto_ospf *)p;

  debug("%s: Got route %I/%d %s\n", p->name, n->n.prefix,
    n->n.pxlen, new ? "up" : "down");

  if(new)		/* Got some new route */
  {
    originate_ext_lsa(n, new, po, attrs);
  }
  else
  {
    u32 rtid=po->proto.cf->global->router_id;
    struct ospf_area *oa;
    struct top_hash_entry *en;

    /* Flush old external LSA */
    WALK_LIST(oa, po->area_list)
    {
      if(en=ospf_hash_find(oa->gr, ipa_to_u32(n->n.prefix), rtid, LSA_T_EXT))
        net_flush_lsa(en,po,oa);
    }
  }
}

static void
ospf_get_status(struct proto *p, byte *buf)
{
  struct proto_ospf *po=(struct proto_ospf *)p;

  if (p->proto_state == PS_DOWN) buf[0] = 0;
  else
  {
    struct ospf_iface *ifa;
    struct ospf_neighbor *n;
    int adj=0;

    WALK_LIST(ifa,po->iface_list)
      WALK_LIST(n,ifa->neigh_list)
        if(n->state==NEIGHBOR_FULL) adj=1;

    if(adj==0) strcpy(buf, "Alone");
    else strcpy(buf, "Running");
  }
}

static void
ospf_get_route_info(rte *rte, byte *buf, ea_list *attrs)
{
  char met=' ';
  char type=' ';

  if(rte->attrs->source==RTS_OSPF_EXT)
  {
    met='1';
    type='E';

  }
  if(rte->u.ospf.metric2!=LSINFINITY) met='2';
  if(rte->attrs->source==RTS_OSPF_IA) type='A';
  if(rte->attrs->source==RTS_OSPF) type='I';
  buf += bsprintf(buf, " %c", type);
  if(met!=' ') buf += bsprintf(buf, "%c", met);
  buf += bsprintf(buf, " (%d/%d)", rte->pref,
    (rte->u.ospf.metric2==LSINFINITY) ? rte->u.ospf.metric1 :
    rte->u.ospf.metric2);
  if(rte->attrs->source==RTS_OSPF_EXT && rte->u.ospf.tag)
  {
    buf += bsprintf(buf, " [%x]", rte->u.ospf.tag);
  }
}

static int
ospf_get_attr(eattr *a, byte *buf)
{
  switch (a->id)
    {
    case EA_OSPF_METRIC1: bsprintf(buf, "metric1"); return GA_NAME;
    case EA_OSPF_METRIC2: bsprintf(buf, "metric2"); return GA_NAME;
    case EA_OSPF_TAG: bsprintf(buf, "tag: %08x", a->u.data); return GA_FULL;
    default: return GA_UNKNOWN;
    }
}

struct protocol proto_ospf = {
  name: 		"OSPF",
  template:		"ospf%d",
  attr_class:		EAP_OSPF,
  init:			ospf_init,
  dump:			ospf_dump,
  start:		ospf_start,
  shutdown:		ospf_shutdown,
  get_route_info:	ospf_get_route_info,
  get_attr:		ospf_get_attr,
  get_status:		ospf_get_status
};

void
ospf_sh_neigh(struct proto *p, char *iff)
{
  struct ospf_iface *ifa=NULL,*f;
  struct ospf_neighbor *n;
  struct proto_ospf *po=(struct proto_ospf *)p;

  if(p->proto_state != PS_UP)
  {
    cli_msg(-1013,"%s: is not up", p->name);
    cli_msg(0,"");
    return;
  }
  
  if(iff!=NULL)
  {
    WALK_LIST(f, po->iface_list)
    {
      if(strcmp(iff,f->iface->name)==0)
      {
        ifa=f;
        break;
      }
    }
    if(ifa==NULL)
    {
      cli_msg(0,"");
      return;
    }
    cli_msg(-1013,"%s:", p->name);
    cli_msg(-1013,"%-12s\t%3s\t%-15s\t%-5s\t%-12s\t%-10s","Router ID","Pri",
      "     State", "DTime", "Router IP", "Interface");
    WALK_LIST(n, ifa->neigh_list) ospf_sh_neigh_info(n);
    cli_msg(0,"");
    return;
  }

  cli_msg(-1013,"%s:", p->name);
  cli_msg(-1013,"%-12s\t%3s\t%-15s\t%-5s\t%-12s\t%-10s","Router ID","Pri",
    "     State", "DTime", "Router IP", "Interface");
  WALK_LIST(ifa,po->iface_list)
    WALK_LIST(n, ifa->neigh_list)
      ospf_sh_neigh_info(n);
  cli_msg(0,"");
}

void
ospf_sh(struct proto *p)
{
  struct ospf_area *oa;
  struct proto_ospf *po=(struct proto_ospf *)p;
  struct ospf_iface *ifa;
  struct ospf_neighbor *n;
  int ifano;
  int nno;
  int adjno;

  if(p->proto_state != PS_UP)
  {
    cli_msg(-1014,"%s: is not up", p->name);
    cli_msg(0,"");
    return;
  }

  cli_msg(-1014,"%s:", p->name);
  cli_msg(-1014,"Number of areas: %u", po->areano);
  
  WALK_LIST(oa,po->area_list)
  {
    cli_msg(-1014,"\tArea: %I (%u) %s", oa->areaid, oa->areaid,
      oa->areaid==0 ? "[BACKBONE]" : "");
    ifano=0;
    nno=0;
    adjno=0;
    WALK_LIST(ifa, po->iface_list)
    {
      if(oa==ifa->oa) ifano++;
      WALK_LIST(n, ifa->neigh_list)
      {
        nno++;
        if(n->state==NEIGHBOR_FULL) adjno++;
      }
    }
    cli_msg(-1014,"\t\tNumber of interfaces: %u", ifano);
    cli_msg(-1014,"\t\tNumber of LSAs: %u", oa->gr->hash_entries);
    cli_msg(-1014,"\t\tNumber of neighbors: %u", nno);
    cli_msg(-1014,"\t\tNumber of fully adjacent neighbors: %u", adjno);
  }
  cli_msg(0,"");
}

void
ospf_sh_iface(struct proto *p, char *iff)
{
  struct ospf_area *oa;
  struct proto_ospf *po=(struct proto_ospf *)p;
  struct ospf_iface *ifa=NULL,*f;
  struct ospf_neighbor *n;
  int ifano;
  int nno;
  int adjno;

  if(p->proto_state != PS_UP)
  {
    cli_msg(-1015,"%s: is not up", p->name);
    cli_msg(0,"");
    return;
  }

  if(iff!=NULL)
  {
    WALK_LIST(f, po->iface_list)
    {
      if(strcmp(iff,f->iface->name)==0)
      {
        ifa=f;
        break;
      }
    }

    if(ifa==NULL)
    {
      cli_msg(0,"");
      return;
    }
    cli_msg(-1015,"%s:", p->name);
    ospf_iface_info(ifa);
    cli_msg(0,"");
    return;
  }
  cli_msg(-1015,"%s:", p->name);
  WALK_LIST(ifa, po->iface_list) ospf_iface_info(ifa);
  cli_msg(0,"");
}