bird/proto/ospf/ospf.c

/*
 *	BIRD -- OSPF
 *
 *	(c) 1999--2004 Ondrej Filip <feela@network.cz>
 *
 *	Can be freely distributed and used under the terms of the GNU GPL.
 */

/**
 * DOC: Open Shortest Path First (OSPF)
 * 
 * The OSPF protocol is quite complicated and its complex implemenation is
 * split to many files. In |ospf.c|, you will find mainly the interface
 * for communication with the core (e.g., reconfiguration hooks, shutdown
 * and initialisation and so on). In |packet.c|, you will find various
 * functions for sending and receiving generic OSPF packets. There are
 * also routines for authentication and checksumming. File |iface.c| contains
 * the interface state machine and functions for allocation and deallocation of OSPF's
 * interface data structures. Source |neighbor.c| includes the neighbor state
 * machine and functions for election of Designated Router and Backup
 * Designated router. In |hello.c|, there are routines for sending
 * and receiving of hello packets as well as functions for maintaining
 * wait times and the inactivity timer. Files |lsreq.c|, |lsack.c|, |dbdes.c|
 * contain functions for sending and receiving of link-state requests,
 * link-state acknowledgements and database descriptions respectively.
 * In |lsupd.c|, there are functions for sending and receiving
 * of link-state updates and also the flooding algorithm. Source |topology.c| is
 * a place where routines for searching LSAs in the link-state database,
 * adding and deleting them reside, there also are functions for originating
 * of various types of LSAs (router LSA, net LSA, external LSA). File |rt.c|
 * contains routines for calculating the routing table. |lsalib.c| is a set
 * of various functions for working with the LSAs (endianity conversions,
 * calculation of checksum etc.).
 *
 * One instance of the protocol is able to hold LSA databases for
 * multiple OSPF areas, to exchange routing information between
 * multiple neighbors and to calculate the routing tables. The core
 * structure is &proto_ospf to which multiple &ospf_area and
 * &ospf_iface structures are connected. &ospf_area is also connected to
 * &top_hash_graph which is a dynamic hashing structure that
 * describes the link-state database. It allows fast search, addition
 * and deletion. Each LSA is kept in two pieces: header and body. Both of them are
 * kept in the endianity of the CPU.
 *
 * The heart beat of ospf is ospf_disp(). It is called at regular intervals
 * (&proto_ospf->tick). It is responsible for aging and flushing of LSAs in
 * the database, for routing table calculaction and it call area_disp() of every
 * ospf_area.
 * 
 * The function area_disp() is
 * responsible for late originating of router LSA and network LSA
 * and for cleanup after routing table calculation process in
 * the area.
 * To every &ospf_iface, we connect one or more
 * &ospf_neighbor's -- a structure containing many timers and queues
 * for building adjacency and for exchange of routing messages.
 *
 * BIRD's OSPF implementation respects RFC2328 in every detail, but
 * some of internal algorithms do differ. The RFC recommends making a snapshot
 * of the link-state database when a new adjacency is forming and sending
 * the database description packets based on the information in this 
 * snapshot. The database can be quite large in some networks, so
 * rather we walk through a &slist structure which allows us to
 * continue even if the actual LSA we were working with is deleted. New
 * LSAs are added at the tail of this &slist.
 *
 * We also don't keep a separate OSPF routing table, because the core
 * helps us by being able to recognize when a route is updated
 * to an identical one and it suppresses the update automatically.
 * Due to this, we can flush all the routes we've recalculated and
 * also those we've deleted to the core's routing table and the
 * core will take care of the rest. This simplifies the process
 * and conserves memory.
 */

#include <stdlib.h>
#include "ospf.h"


static void ospf_rt_notify(struct proto *p, net * n, rte * new, rte * old UNUSED, ea_list * attrs);
static void ospf_ifa_notify(struct proto *p, unsigned flags, struct ifa *a);
static int ospf_rte_better(struct rte *new, struct rte *old);
static int ospf_rte_same(struct rte *new, struct rte *old);
static void ospf_disp(timer *timer);

static void
ospf_area_initfib(struct fib_node *fn)
{
  struct area_net *an = (struct area_net *) fn;
  an->hidden = 0;
  an->active = -1;	/* Force to regenerate summary lsa */
	/* ac->oldactive will be rewritten by ospf_rt_spf() */
}

static void
add_area_nets(struct ospf_area *oa, struct ospf_area_config *ac)
{
    struct proto_ospf *po = oa->po;
    struct proto *p = &po->proto;
    struct area_net_config *anet;
    struct area_net *antmp;

    fib_init(&oa->net_fib, p->pool, sizeof(struct area_net), 16, ospf_area_initfib);

    WALK_LIST(anet, ac->net_list)
    {
      antmp = (struct area_net *) fib_get(&oa->net_fib, &anet->px.addr, anet->px.len);
      antmp->hidden = anet->hidden;
    }
}

static int
ospf_start(struct proto *p)
{
  struct proto_ospf *po = (struct proto_ospf *) p;
  struct ospf_config *c = (struct ospf_config *) (p->cf);
  struct ospf_area_config *ac;
  struct ospf_area *oa;

  po->rfc1583 = c->rfc1583;
  po->ebit = 0;

  po->tick = c->tick;
  po->disp_timer = tm_new(p->pool);
  po->disp_timer->data = po;
  po->disp_timer->randomize = 0;
  po->disp_timer->hook = ospf_disp;
  po->disp_timer->recurrent = po->tick;
  tm_start(po->disp_timer, 1);
  po->lsab_size = 256;
  po->lsab_used = 0;
  po->lsab = mb_alloc(p->pool, po->lsab_size);
  init_list(&(po->iface_list));
  init_list(&(po->area_list));
  fib_init(&po->rtf, p->pool, sizeof(ort), 16, ospf_rt_initort);
  po->areano = 0;
  po->gr = ospf_top_new(p->pool);
  po->cleanup = 1;
  s_init_list(&(po->lsal));
  if (EMPTY_LIST(c->area_list))
  {
    log(L_ERR "Cannot start, no OSPF areas configured!");
    return PS_DOWN;
  }

  WALK_LIST(ac, c->area_list)
  {
    oa = mb_allocz(p->pool, sizeof(struct ospf_area));
    add_tail(&po->area_list, NODE oa);
    po->areano++;
    oa->ac = ac;
    oa->stub = ac->stub;
    oa->areaid = ac->areaid;
    oa->rt = NULL;
    oa->po = po;
    add_area_nets(oa, ac);
    fib_init(&oa->rtr, p->pool, sizeof(ort), 16, ospf_rt_initort);

    if (oa->areaid == 0)
    {
      po->backbone = oa;
      if (oa->stub) log(L_ERR "Backbone cannot be stub. Ignoring!");
      oa->stub = 0;
    }

#ifdef OSPFv2
    oa->options = (oa->stub ? 0 : OPT_E);
#else /* OSPFv3 */
    oa->options = OPT_R | (oa->stub ? 0 : OPT_E) | OPT_V6;
#endif
  }

  /* Add all virtual links as interfaces */
  {
    struct ospf_iface_patt *ipatt;
    WALK_LIST(ac, c->area_list)
    {
      WALK_LIST(ipatt, ac->vlink_list)
      {
        if(!po->backbone)
	{
          oa = mb_allocz(p->pool, sizeof(struct ospf_area));
          add_tail(&po->area_list, NODE oa);
          po->areano++;
          oa->stub = 0;
          oa->areaid = 0;
          oa->rt = NULL;
          oa->po = po;
	  fib_init(&oa->net_fib, p->pool, sizeof(struct area_net), 16, ospf_area_initfib);
          fib_init(&oa->rtr, p->pool, sizeof(ort), 16, ospf_rt_initort);
          po->backbone = oa;
#ifdef OSPFv2
	  oa->options = OPT_E;
#else /* OSPFv3 */
	  oa->options = OPT_R | OPT_E | OPT_V6;
#endif
	}
        ospf_iface_new(po, NULL, ac, ipatt);
      }
    }
  }
  return PS_UP;
}

static void
ospf_dump(struct proto *p)
{
  struct ospf_iface *ifa;
  struct ospf_neighbor *n;
  struct proto_ospf *po = (struct proto_ospf *) p;

  OSPF_TRACE(D_EVENTS, "Area number: %d", po->areano);

  WALK_LIST(ifa, po->iface_list)
  {
    OSPF_TRACE(D_EVENTS, "Interface: %s", (ifa->iface ? ifa->iface->name : "(null)"));
    OSPF_TRACE(D_EVENTS, "state: %u", ifa->state);
    OSPF_TRACE(D_EVENTS, "DR:  %R", ifa->drid);
    OSPF_TRACE(D_EVENTS, "BDR: %R", ifa->bdrid);
    WALK_LIST(n, ifa->neigh_list)
    {
      OSPF_TRACE(D_EVENTS, "  neighbor %R in state %u", n->rid, n->state);
    }
  }

  OSPF_TRACE(D_EVENTS, "LSA graph dump start:");
  ospf_top_dump(po->gr, p);
  OSPF_TRACE(D_EVENTS, "LSA graph dump finished");
  neigh_dump_all();
}

static struct proto *
ospf_init(struct proto_config *c)
{
  struct proto *p = proto_new(c, sizeof(struct proto_ospf));

  p->import_control = ospf_import_control;
  p->make_tmp_attrs = ospf_make_tmp_attrs;
  p->store_tmp_attrs = ospf_store_tmp_attrs;
  p->accept_ra_types = RA_OPTIMAL;
  p->rt_notify = ospf_rt_notify;
  p->if_notify = ospf_iface_notify;
  p->ifa_notify = ospf_ifa_notify;
  p->rte_better = ospf_rte_better;
  p->rte_same = ospf_rte_same;

  return p;
}

/* If new is better return 1 */
static int
ospf_rte_better(struct rte *new, struct rte *old)
{
  if (new->u.ospf.metric1 == LSINFINITY)
    return 0;

  if(new->attrs->source < old->attrs->source) return 1;
  if(new->attrs->source > old->attrs->source) return 0;

  if(new->attrs->source == RTS_OSPF_EXT2)
  {
    if(new->u.ospf.metric2 < old->u.ospf.metric2) return 1;
    if(new->u.ospf.metric2 > old->u.ospf.metric2) return 0;
  }

  if (new->u.ospf.metric1 < old->u.ospf.metric1)
    return 1;

  return 0;			/* Old is shorter or same */
}

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_net_lsa(struct ospf_iface *ifa)
{
  struct proto *p = &ifa->oa->po->proto;

  OSPF_TRACE(D_EVENTS, "Scheduling network-LSA origination for iface %s", ifa->iface->name);
  ifa->orignet = 1;
}

#ifdef OSPFv3
void
schedule_link_lsa(struct ospf_iface *ifa)
{
  struct proto *p = &ifa->oa->po->proto;

  OSPF_TRACE(D_EVENTS, "Scheduling link-LSA origination for iface %s", ifa->iface->name);
  ifa->origlink = 1;
}
#endif

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

  OSPF_TRACE(D_EVENTS, "Scheduling router-LSA origination for area %R", oa->areaid);
  oa->origrt = 1;
}

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

  if (po->calcrt)
    return;

  OSPF_TRACE(D_EVENTS, "Scheduling routing table calculation");
  po->calcrt = 1;
}

/**
 * area_disp - invokes origination of
 * router LSA and routing table cleanup
 * @oa: ospf area
 *
 * It invokes aging and when @ospf_area->origrt is set to 1, start
 * function for origination of router, network LSAs.
 */
void
area_disp(struct ospf_area *oa)
{
  struct proto_ospf *po = oa->po;
  struct ospf_iface *ifa;

  /* Now try to originage rt_lsa */
  if (oa->origrt)
    update_rt_lsa(oa);

  /* Now try to originate network LSA's */
  WALK_LIST(ifa, po->iface_list)
  {
#ifdef OSPFv3
    /* Link LSA should be originated before Network LSA */
    if (ifa->origlink && (ifa->oa == oa))
      update_link_lsa(ifa);
#endif

    if (ifa->orignet && (ifa->oa == oa))
      update_net_lsa(ifa);
  }
}

/**
 * ospf_disp - invokes routing table calctulation, aging and also area_disp()
 * @timer: timer usually called every @proto_ospf->tick second, @timer->data
 * point to @proto_ospf
 */
void
ospf_disp(timer * timer)
{
  struct proto_ospf *po = timer->data;
  struct ospf_area *oa;

  WALK_LIST(oa, po->area_list)
    area_disp(oa);

  /* Age LSA DB */
  ospf_age(po);

  /* Calculate routing table */
  if (po->calcrt)
    ospf_rt_spf(po);
}



/**
 * ospf_import_control - accept or reject new route from nest's routing table
 * @p: current instance of protocol
 * @new: the new route
 * @attrs: list of attributes
 * @pool: pool for allocation of attributes
 *
 * Its quite simple. It does not accept our own routes and leaves the decision on
 * import to the filters.
 */

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

  if (p == e->attrs->proto)
    return -1;			/* Reject our own routes */
  *attrs = ospf_build_attrs(*attrs, pool, LSINFINITY, 10000, 0);
  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, LSINFINITY);
  rt->u.ospf.metric2 = ea_get_int(attrs, EA_OSPF_METRIC2, 10000);
  rt->u.ospf.tag = ea_get_int(attrs, EA_OSPF_TAG, 0);
}

/**
 * ospf_shutdown - Finish of OSPF instance
 * @p: current instance of protocol
 *
 * RFC does not define any action that should be taken before router
 * shutdown. To make my neighbors react as fast as possible, I send
 * them hello packet with empty neighbor list. They should start
 * their neighbor state machine with event %NEIGHBOR_1WAY.
 */

static int
ospf_shutdown(struct proto *p)
{
  struct proto_ospf *po = (struct proto_ospf *) p;
  struct ospf_iface *ifa;
  OSPF_TRACE(D_EVENTS, "Shutdown requested");

  /* And send to all my neighbors 1WAY */
  WALK_LIST(ifa, po->iface_list) ospf_iface_shutdown(ifa);

  return PS_DOWN;
}

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

/* Temporarily down write anything
  OSPF_TRACE(D_EVENTS, "Got route %I/%d %s", 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
    flush_ext_lsa(n, po);
}

static void
ospf_ifa_notify(struct proto *p, unsigned flags, struct ifa *a)
{
  struct proto_ospf *po = (struct proto_ospf *) p;
  struct ospf_iface *ifa;
  
  if ((a->flags & IA_SECONDARY) || (a->flags & IA_UNNUMBERED))
    return;

  WALK_LIST(ifa, po->iface_list)
    {
      if (ifa->iface == a->iface)
	{
	  schedule_rt_lsa(ifa->oa);
	  schedule_link_lsa(ifa);
	  return;
	}
    }
}

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 UNUSED)
{
  char *type = "<bug>";

  switch(rte->attrs->source)
  {
    case RTS_OSPF:
      type = "I";
      break;
    case RTS_OSPF_IA:
      type = "IA";
      break;
    case RTS_OSPF_EXT1:
      type = "E1";
      break;
    case RTS_OSPF_EXT2:
      type = "E2";
      break;
  }

  buf += bsprintf(buf, " %s", type);
  buf += bsprintf(buf, " (%d/%d", rte->pref, rte->u.ospf.metric1);
  if (rte->attrs->source == RTS_OSPF_EXT2)
    buf += bsprintf(buf, "/%d", rte->u.ospf.metric2);
  buf += bsprintf(buf, ")");
  if ((rte->attrs->source == RTS_OSPF_EXT2 || rte->attrs->source == RTS_OSPF_EXT1) && rte->u.ospf.tag)
  {
    buf += bsprintf(buf, " [%x]", rte->u.ospf.tag);
  }
}

static int
ospf_get_attr(eattr * a, byte * buf, int buflen UNUSED)
{
  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;
  }
}

static int
ospf_patt_compare(struct ospf_iface_patt *a, struct ospf_iface_patt *b)
{
  return (a->type == b->type);
}

/**
 * ospf_reconfigure - reconfiguration hook
 * @p: current instance of protocol (with old configuration)
 * @c: new configuration requested by user
 *
 * This hook tries to be a little bit intelligent. Instance of OSPF
 * will survive change of many constants like hello interval,
 * password change, addition or deletion of some neighbor on
 * nonbroadcast network, cost of interface, etc.
 */
static int
ospf_reconfigure(struct proto *p, struct proto_config *c)
{
  struct ospf_config *old = (struct ospf_config *) (p->cf);
  struct ospf_config *new = (struct ospf_config *) c;
  struct ospf_area_config *oldac, *newac;
  struct proto_ospf *po = (struct proto_ospf *) p;
  struct ospf_iface_patt *oldip, *newip;
  struct ospf_iface *ifa;
  struct nbma_node *nb1, *nb2, *nbnx;
  struct ospf_area *oa = NULL;
  int found, olddead, newdead;
  struct area_net_config *anc;
  struct area_net *an;

  if (po->rfc1583 != new->rfc1583)
    return 0;

  schedule_rtcalc(po);

  po->tick = new->tick;
  po->disp_timer->recurrent = po->tick;
  tm_start(po->disp_timer, 1);

  oldac = HEAD(old->area_list);
  newac = HEAD(new->area_list);

  /* I should get it in the same order */

  while (((NODE(oldac))->next != NULL) && ((NODE(newac))->next != NULL))
  {
    if (oldac->areaid != newac->areaid)
      return 0;

    WALK_LIST(oa, po->area_list)
      if (oa->areaid == newac->areaid)
        break;

    if (!oa)
      return 0;

    oa->ac = newac;
    oa->stub = newac->stub;
    if (newac->stub && (oa->areaid == 0)) oa->stub = 0;

    /* Check stubnet_list */
    struct ospf_stubnet_config *oldsn = HEAD(oldac->stubnet_list);
    struct ospf_stubnet_config *newsn = HEAD(newac->stubnet_list);

    while (((NODE(oldsn))->next != NULL) && ((NODE(newsn))->next != NULL))
      {
	if (!ipa_equal(oldsn->px.addr, newsn->px.addr) ||
	    (oldsn->px.len != newsn->px.len) ||
	    (oldsn->hidden != newsn->hidden) ||
	    (oldsn->summary != newsn->summary) ||
	    (oldsn->cost != newsn->cost))
	  break;

	oldsn = (struct ospf_stubnet_config *)(NODE(oldsn))->next;
	newsn = (struct ospf_stubnet_config *)(NODE(newsn))->next;
      }

    /* If there is no change, both pointers should be NULL */
    if (((NODE(oldsn))->next) != ((NODE(newsn))->next))
      schedule_rt_lsa(oa);

    /* Change net_list */
    FIB_WALK(&oa->net_fib, nf)	/* First check if some networks are deleted */
    {
      found = 0;
      WALK_LIST(anc, newac->net_list)
      {
        if (ipa_equal(anc->px.addr, nf->prefix) && (anc->px.len == nf->pxlen))
	{
	  found = 1;
	  break;
	}
	if (!found) flush_sum_lsa(oa, nf, ORT_NET);	/* And flush them */
      }
    }
    FIB_WALK_END;

    WALK_LIST(anc, newac->net_list)	/* Second add new networks */
    {
      an = fib_get(&oa->net_fib, &anc->px.addr, anc->px.len);
      an->hidden = anc->hidden;
    }

    if (!iface_patts_equal(&oldac->patt_list, &newac->patt_list,
			   (void *) ospf_patt_compare))
      return 0;

    WALK_LIST(ifa, po->iface_list)
    {
      if (oldip = (struct ospf_iface_patt *)
	  iface_patt_find(&oldac->patt_list, ifa->iface))
      {
	/* Now reconfigure interface */
	if (!(newip = (struct ospf_iface_patt *)
	      iface_patt_find(&newac->patt_list, ifa->iface)))
	  return 0;

	/* HELLO TIMER */
	if (oldip->helloint != newip->helloint)
	{
	  ifa->helloint = newip->helloint;
	  ifa->hello_timer->recurrent = ifa->helloint;
	  tm_start(ifa->hello_timer, ifa->helloint);
	  OSPF_TRACE(D_EVENTS,
		     "Changing hello interval on interface %s from %d to %d",
		     ifa->iface->name, oldip->helloint, newip->helloint);
	}

	/* POLL TIMER */
	if (oldip->pollint != newip->pollint)
	{
	  ifa->pollint = newip->helloint;
	  ifa->poll_timer->recurrent = ifa->pollint;
	  tm_start(ifa->poll_timer, ifa->pollint);
	  OSPF_TRACE(D_EVENTS,
		     "Changing poll interval on interface %s from %d to %d",
		     ifa->iface->name, oldip->pollint, newip->pollint);
	}

	/* COST */
	if (oldip->cost != newip->cost)
	{
	  ifa->cost = newip->cost;
	  OSPF_TRACE(D_EVENTS,
		     "Changing cost interface %s from %d to %d",
		     ifa->iface->name, oldip->cost, newip->cost);
	  schedule_rt_lsa(ifa->oa);
	}

	/* RX BUFF */
	if (oldip->rxbuf != newip->rxbuf)
	{
	  ifa->rxbuf = newip->rxbuf;
	  OSPF_TRACE(D_EVENTS,
		     "Changing rxbuf interface %s from %d to %d",
		     ifa->iface->name, oldip->rxbuf, newip->rxbuf);
	  ospf_iface_change_mtu(po, ifa);
	}

	/* strict nbma */
	if ((oldip->strictnbma == 0) && (newip->strictnbma != 0))
	{
	  ifa->strictnbma = newip->strictnbma;
	  OSPF_TRACE(D_EVENTS,
		     "Interface %s is now strict NBMA.", ifa->iface->name);
	}
	if ((oldip->strictnbma != 0) && (newip->strictnbma == 0))
	{
	  ifa->strictnbma = newip->strictnbma;
	  OSPF_TRACE(D_EVENTS,
		     "Interface %s is no longer strict NBMA.",
		     ifa->iface->name);
	}

	/* stub */
	if ((oldip->stub == 0) && (newip->stub != 0))
	{
	  ifa->stub = newip->stub;
	  OSPF_TRACE(D_EVENTS, "Interface %s is now stub.", ifa->iface->name);
	}
	if ((oldip->stub != 0) && (newip->stub == 0) &&
	    ((ifa->ioprob & OSPF_I_IP) == 0) &&
	    (((ifa->ioprob & OSPF_I_MC) == 0) || (ifa->type == OSPF_IT_NBMA)))
	{
	  ifa->stub = newip->stub;
	  OSPF_TRACE(D_EVENTS,
		     "Interface %s is no longer stub.", ifa->iface->name);
	}

#ifdef OSPFv2	
	/* AUTHENTICATION */
	if (oldip->autype != newip->autype)
	{
	  ifa->autype = newip->autype;
	  OSPF_TRACE(D_EVENTS,
		     "Changing authentication type on interface %s",
		     ifa->iface->name);
	}
        /* Add *passwords */
	ifa->passwords = newip->passwords;
#endif

	/* priority */
	if (oldip->priority != newip->priority)
	{
	  ifa->priority = newip->priority;
	  OSPF_TRACE(D_EVENTS,
		     "Changing priority on interface %s from %d to %d",
		     ifa->iface->name, oldip->priority, newip->priority);
	}

	/* RXMT */
	if (oldip->rxmtint != newip->rxmtint)
	{
	  ifa->rxmtint = newip->rxmtint;
	  OSPF_TRACE(D_EVENTS,
		     "Changing retransmit interval on interface %s from %d to %d",
		     ifa->iface->name, oldip->rxmtint, newip->rxmtint);
	}

	/* WAIT */
	if (oldip->waitint != newip->waitint)
	{
	  ifa->waitint = newip->waitint;
	  if (ifa->wait_timer->expires != 0)
	    tm_start(ifa->wait_timer, ifa->waitint);
	  OSPF_TRACE(D_EVENTS,
		     "Changing wait interval on interface %s from %d to %d",
		     ifa->iface->name, oldip->waitint, newip->waitint);
	}

	/* INFTRANS */
	if (oldip->inftransdelay != newip->inftransdelay)
	{
	  ifa->inftransdelay = newip->inftransdelay;
	  OSPF_TRACE(D_EVENTS,
		     "Changing transmit delay on interface %s from %d to %d",
		     ifa->iface->name, oldip->inftransdelay,
		     newip->inftransdelay);
	}

	/* DEAD */
	olddead = (oldip->dead == 0) ? oldip->deadc * oldip->helloint : oldip->dead;
	newdead = (newip->dead == 0) ? newip->deadc * newip->helloint : newip->dead;
	if (olddead != newdead)
	{
	  ifa->dead = newdead;
	  OSPF_TRACE(D_EVENTS,
		     "Changing dead interval on interface %s from %d to %d",
		     ifa->iface->name, olddead, newdead);
	}

	/* NBMA LIST */
	/* First remove old */
	WALK_LIST_DELSAFE(nb1, nbnx, ifa->nbma_list)
	{
	  found = 0;
	  WALK_LIST(nb2, newip->nbma_list)
	    if (ipa_compare(nb1->ip, nb2->ip) == 0)
	  {
	    found = 1;
	    if (nb1->eligible != nb2->eligible)
	      OSPF_TRACE(D_EVENTS,
			 "Changing neighbor eligibility %I on interface %s",
			 nb1->ip, ifa->iface->name);
	    break;
	  }

	  if (!found)
	  {
	    OSPF_TRACE(D_EVENTS,
		       "Removing NBMA neighbor %I on interface %s",
		       nb1->ip, ifa->iface->name);
	    rem_node(NODE nb1);
	    mb_free(nb1);
	  }
	}
	/* And then add new */
	WALK_LIST(nb2, newip->nbma_list)
	{
	  found = 0;
	  WALK_LIST(nb1, ifa->nbma_list)
	    if (ipa_compare(nb1->ip, nb2->ip) == 0)
	  {
	    found = 1;
	    break;
	  }
	  if (!found)
	  {
	    nb1 = mb_alloc(p->pool, sizeof(struct nbma_node));
	    nb1->ip = nb2->ip;
	    nb1->eligible = nb2->eligible;
	    add_tail(&ifa->nbma_list, NODE nb1);
	    OSPF_TRACE(D_EVENTS,
		       "Adding NBMA neighbor %I on interface %s",
		       nb1->ip, ifa->iface->name);
	  }
	}
      }
    }

    oldac = (struct ospf_area_config *)(NODE(oldac))->next;
    newac = (struct ospf_area_config *)(NODE(newac))->next;
  }

  if (((NODE(oldac))->next) != ((NODE(newac))->next))
    return 0;			/* One is not null */

  return 1;			/* Everything OK :-) */
}

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, nno, adjno, firstfib;
  struct area_net *anet;

  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, "RFC1583 compatibility: %s", (po->rfc1583 ? "enable" : "disabled"));
  cli_msg(-1014, "RT scheduler tick: %d", po->tick);
  cli_msg(-1014, "Number of areas: %u", po->areano);
  cli_msg(-1014, "Number of LSAs in DB:\t%u", po->gr->hash_entries);

  WALK_LIST(oa, po->area_list)
  {
    cli_msg(-1014, "\tArea: %R (%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\tStub:\t%s", oa->stub ? "Yes" : "No");
    cli_msg(-1014, "\t\tTransit:\t%s", oa->trcap ? "Yes" : "No");
    cli_msg(-1014, "\t\tNumber of interfaces:\t%u", ifano);
    cli_msg(-1014, "\t\tNumber of neighbors:\t%u", nno);
    cli_msg(-1014, "\t\tNumber of adjacent neighbors:\t%u", adjno);

    firstfib = 1;
    FIB_WALK(&oa->net_fib, nftmp)
    {
      anet = (struct area_net *) nftmp;
      if(firstfib)
      {
        cli_msg(-1014, "\t\tArea networks:");
        firstfib = 0;
      }
      cli_msg(-1014, "\t\t\t%1I/%u\t%s\t%s", anet->fn.prefix, anet->fn.pxlen,
		anet->hidden ? "Hidden" : "Advertise", anet->active ? "Active" : "");
    }
    FIB_WALK_END;
  }
  cli_msg(0, "");
}

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

  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, "");
}

/* lsa_compare_for_state() - Compare function for 'show ospf state'
 *
 * First we want to separate network-LSAs and other LSAs (because network-LSAs
 * will be presented as network nodes and other LSAs together as router nodes)
 * Network-LSAs are sorted according to network prefix, other LSAs are sorted
 * according to originating router id (to get all LSA needed to represent one
 * router node together). Then, according to LSA type, ID and age.
 *
 * For OSPFv3, we have to handle also Prefix-LSAs. We would like to put each
 * immediately after the referenced LSA. We will make faked LSA based on ref_
 * values
 */

static struct ospf_lsa_header *
fake_lsa_from_prefix_lsa(struct ospf_lsa_header *dst, struct ospf_lsa_header *src,
			 struct ospf_lsa_prefix *px)
{
  dst->age = src->age;
  dst->type = px->ref_type;
  dst->id = px->ref_id;
  dst->rt = px->ref_rt;
  dst->sn = src->sn;

  return dst;
}

static int
lsa_compare_for_state(const void *p1, const void *p2)
{
  struct top_hash_entry * he1 = * (struct top_hash_entry **) p1;
  struct top_hash_entry * he2 = * (struct top_hash_entry **) p2;
  struct ospf_lsa_header *lsa1 = &(he1->lsa);
  struct ospf_lsa_header *lsa2 = &(he2->lsa);

  if (he1->domain != he2->domain)
    return he1->domain - he2->domain;

#ifdef OSPFv3
  struct ospf_lsa_header lsatmp1, lsatmp2;

  int px1 = (lsa1->type == LSA_T_PREFIX);
  int px2 = (lsa2->type == LSA_T_PREFIX);

  if (px1)
    lsa1 = fake_lsa_from_prefix_lsa(&lsatmp1, lsa1, he1->lsa_body);

  if (px2)
    lsa2 = fake_lsa_from_prefix_lsa(&lsatmp2, lsa2, he2->lsa_body);
#endif

  int nt1 = (lsa1->type == LSA_T_NET);
  int nt2 = (lsa2->type == LSA_T_NET);

  if (nt1 != nt2)
    return nt1 - nt2;

  if (nt1)
  {
#ifdef OSPFv3
    /* In OSPFv3, neworks are named base on ID of DR */
    if (lsa1->rt != lsa2->rt)
      return lsa1->rt - lsa2->rt;
#endif

    /* For OSPFv2, this is IP of the network,
       for OSPFv3, this is interface ID */
    if (lsa1->id != lsa2->id)
      return lsa1->id - lsa2->id;

#ifdef OSPFv3
    if (px1 != px2)
      return px1 - px2;
#endif

    return lsa1->sn - lsa2->sn;
  }
  else 
  {
    if (lsa1->rt != lsa2->rt)
      return lsa1->rt - lsa2->rt;

    if (lsa1->type != lsa2->type)
      return lsa1->type - lsa2->type;
  
    if (lsa1->id != lsa2->id)
      return lsa1->id - lsa2->id;

#ifdef OSPFv3
    if (px1 != px2)
      return px1 - px2;
#endif
  
    return lsa1->sn - lsa2->sn;
  }
}

static inline void
show_lsa_router(struct proto_ospf *po, struct top_hash_entry *he)
{
  struct ospf_lsa_header *lsa = &(he->lsa);
  struct ospf_lsa_rt *rt = he->lsa_body;
  struct ospf_lsa_rt_link *rr = (struct ospf_lsa_rt_link *) (rt + 1);
  int max = lsa_rt_count(lsa);
  int i;

  for (i = 0; i < max; i++)
    if (rr[i].type == LSART_VLNK)
      cli_msg(-1016, "\t\tvlink %R metric %u", rr[i].id, rr[i].metric);

  for (i = 0; i < max; i++)
    if (rr[i].type == LSART_PTP)
      cli_msg(-1016, "\t\trouter %R metric %u", rr[i].id, rr[i].metric);

  for (i = 0; i < max; i++)
    if (rr[i].type == LSART_NET)
    {
#ifdef OSPFv2
      struct top_hash_entry *net_he = ospf_hash_find_net(po->gr, he->domain, rr[i].id);

      if (net_he)
      {
	struct ospf_lsa_header *net_lsa = &(net_he->lsa);
	struct ospf_lsa_net *net_ln = net_he->lsa_body;

	cli_msg(-1016, "\t\tnetwork %I/%d metric %u", 
		ipa_and(ipa_from_u32(net_lsa->id), net_ln->netmask),
		ipa_mklen(net_ln->netmask), rr[i].metric);
      }
      else
	cli_msg(-1016, "\t\tnetwork [%R] metric %u", rr[i].id, rr[i].metric);

#else /* OSPFv3 */
      cli_msg(-1016, "\t\tnetwork [%R-%u] metric %u", rr[i].id, rr[i].nif, rr[i].metric);
#endif
    }

#ifdef OSPFv2
  for (i = 0; i < max; i++)
    if (rr[i].type == LSART_STUB)
      cli_msg(-1016, "\t\tstubnet %I/%d metric %u", ipa_from_u32(rr[i].id),
	      ipa_mklen(ipa_from_u32(rr[i].data)), rr[i].metric);
#endif
}

static inline void
show_lsa_network(struct top_hash_entry *he)
{
  struct ospf_lsa_header *lsa = &(he->lsa);
  struct ospf_lsa_net *ln = he->lsa_body;
  u32 i;

#ifdef OSPFv2
  cli_msg(-1016, "");
  cli_msg(-1016, "\tnetwork %I/%d", ipa_and(ipa_from_u32(lsa->id), ln->netmask), ipa_mklen(ln->netmask));
  cli_msg(-1016, "\t\tdr %R", lsa->rt);
#else /* OSPFv3 */
  cli_msg(-1016, "");
  cli_msg(-1016, "\tnetwork [%R-%u]", lsa->rt, lsa->id);
#endif

  for (i = 0; i < lsa_net_count(lsa); i++)
    cli_msg(-1016, "\t\trouter %R", ln->routers[i]);
}

static inline void
show_lsa_sum_net(struct top_hash_entry *he)
{
  struct ospf_lsa_header *lsa = &(he->lsa);
  ip_addr ip;
  int pxlen;

#ifdef OSPFv2
  struct ospf_lsa_sum *ls = he->lsa_body;
  pxlen = ipa_mklen(ls->netmask);
  ip = ipa_and(ipa_from_u32(he->lsa.id), ls->netmask);
#else /* OSPFv3 */
  u8 pxopts;
  u16 rest;
  struct ospf_lsa_sum_net *ls = he->lsa_body;
  lsa_get_ipv6_prefix(ls->prefix, &ip, &pxlen, &pxopts, &rest);
#endif

  cli_msg(-1016, "\t\txnetwork %I/%d", ip, pxlen);
}

static inline void
show_lsa_sum_rt(struct top_hash_entry *he)
{
  u32 dst_rid, options;

#ifdef OSPFv2
  struct ospf_lsa_sum *ls = he->lsa_body;
  dst_rid = he->lsa.id;
  options = 0;
#else /* OSPFv3 */
  struct ospf_lsa_sum_rt *ls = he->lsa_body;
  dst_rid = ls->drid; 
  options = ls->options & OPTIONS_MASK;
#endif

  cli_msg(-1016, "\t\txrouter %R", dst_rid);
}


static inline void
show_lsa_external(struct top_hash_entry *he)
{
  struct ospf_lsa_header *lsa = &(he->lsa);
  struct ospf_lsa_ext *ext = he->lsa_body;
  struct ospf_lsa_ext_tos *et = (struct ospf_lsa_ext_tos *) (ext + 1);
  char str_via[STD_ADDRESS_P_LENGTH + 8] = "";
  char str_tag[16] = "";
  ip_addr ip, rt_fwaddr;
  int pxlen, ebit, rt_fwaddr_valid;
  u32 rt_tag, rt_metric;

  rt_metric = ext->metric & METRIC_MASK;
  ebit = ext->metric & LSA_EXT_EBIT;
#ifdef OSPFv2
  ip = ipa_and(ipa_from_u32(lsa->id), ext->netmask);
  pxlen = ipa_mklen(ext->netmask);
  rt_fwaddr = ext->fwaddr;
  rt_fwaddr_valid = !ipa_equal(rt_fwaddr, IPA_NONE);
  rt_tag = ext->tag;
#else /* OSPFv3 */
  u8 pxopts;
  u16 rest;
  u32 *buf = ext->rest;
  buf = lsa_get_ipv6_prefix(buf, &ip, &pxlen, &pxopts, &rest);

  rt_fwaddr_valid = ext->metric & LSA_EXT_FBIT;
  if (rt_fwaddr_valid)
    buf = lsa_get_ipv6_addr(buf, &rt_fwaddr);
  else 
    rt_fwaddr = IPA_NONE;

  if (ext->metric & LSA_EXT_TBIT)
    rt_tag = *buf++;
  else
    rt_tag = 0;
#endif
  
  if (rt_fwaddr_valid)
    bsprintf(str_via, " via %I", rt_fwaddr);

  if (rt_tag)
    bsprintf(str_tag, " tag %08x", rt_tag);

  cli_msg(-1016, "\t\texternal %I/%d metric%s %u%s%s", ip, pxlen,
	  ebit ? "2" : "", rt_metric, str_via, str_tag);
}

#ifdef OSPFv3
static inline void
show_lsa_prefix(struct top_hash_entry *he, struct ospf_lsa_header *olsa)
{
  struct ospf_lsa_header *lsa = &(he->lsa);
  struct ospf_lsa_prefix *px = he->lsa_body;
  struct ospf_lsa_ext *ext = he->lsa_body;
  char *msg;
  ip_addr pxa;
  int pxlen;
  u8 pxopts;
  u16 metric;
  u32 *buf;
  int i;

  /* We check whether given prefix-LSA is related to the last non-prefix-LSA */
  if ((olsa == NULL) || (olsa->type != px->ref_type) || (olsa->rt != px->ref_rt) ||
      !(((px->ref_type == LSA_T_RT)  && (px->ref_id == 0)) ||
	((px->ref_type == LSA_T_NET) && (px->ref_id == olsa->id))))
    return;

  buf = px->rest;
  for (i = 0; i < px->pxcount; i++)
    {
      buf = lsa_get_ipv6_prefix(buf, &pxa, &pxlen, &pxopts, &metric);

      if (px->ref_type == LSA_T_RT)
	cli_msg(-1016, "\t\tstubnet %I/%d metric %u", pxa, pxlen, metric);
      else
	cli_msg(-1016, "\t\taddress %I/%d", pxa, pxlen);
    }
}
#endif

void
ospf_sh_state(struct proto *p, int verbose)
{
  struct proto_ospf *po = (struct proto_ospf *) p;
  struct top_graph *f = po->gr;
  unsigned int i, j1, j2;
  u32 last_rt = 0xFFFFFFFF;
  u32 last_area = 0xFFFFFFFF;

#ifdef OSPFv3
  struct ospf_lsa_header *olsa = NULL;
#endif

  if (p->proto_state != PS_UP)
  {
    cli_msg(-1016, "%s: is not up", p->name);
    cli_msg(0, "");
    return;
  }

  struct top_hash_entry *hea[f->hash_entries];
  struct top_hash_entry *he;

  j1 = j2 = 0;
  WALK_SLIST(he, po->lsal)
  {
    int accept;

    switch (he->lsa.type)
      {
      case LSA_T_RT:
      case LSA_T_NET:
	accept = 1;
	break;

      case LSA_T_SUM_NET:
      case LSA_T_SUM_RT:
      case LSA_T_EXT:
#ifdef OSPFv3
      case LSA_T_PREFIX:
#endif
	accept = verbose;
	break;

      default:
	accept = 0;
      }

    if (accept)
      hea[j1++] = he;
    else
      j2++;
  }

  if ((j1 + j2) != f->hash_entries)
    die("Fatal mismatch");

  qsort(hea, j1, sizeof(struct top_hash_entry *), lsa_compare_for_state);

  for (i = 0; i < j1; i++)
  {
    if (last_area != hea[i]->domain)
    {
      cli_msg(-1016, "");
      cli_msg(-1016, "area %R", hea[i]->domain);
      last_area = hea[i]->domain;
      last_rt = 0xFFFFFFFF;
    }

    if ((hea[i]->lsa.rt != last_rt) && (hea[i]->lsa.type != LSA_T_NET)
#ifdef OSPFv3
	&& (hea[i]->lsa.type != LSA_T_PREFIX)
#endif
	)
    {
      cli_msg(-1016, "");
      cli_msg(-1016, (hea[i]->lsa.type != LSA_T_EXT) ? "\trouter %R" : "\txrouter %R", hea[i]->lsa.rt);
      last_rt = hea[i]->lsa.rt;
    }

    switch (hea[i]->lsa.type)
    {
      case LSA_T_RT:
        show_lsa_router(po, hea[i]);
	break;

      case LSA_T_NET:
	show_lsa_network(hea[i]);
	break;

      case LSA_T_SUM_NET:
	show_lsa_sum_net(hea[i]);
	break;

      case LSA_T_SUM_RT:
	show_lsa_sum_rt(hea[i]);
	break;

      case LSA_T_EXT:
	show_lsa_external(hea[i]);
	break;

#ifdef OSPFv3
      case LSA_T_PREFIX:
	show_lsa_prefix(hea[i], olsa);
	break;
#endif
    }

#ifdef OSPFv3
    if (hea[i]->lsa.type != LSA_T_PREFIX)
      olsa = &(hea[i]->lsa);
#endif
  }
  cli_msg(0, "");
}

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,
  reconfigure:ospf_reconfigure
};