bird/proto/ospf/iface.c

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

#include "ospf.h"

char *ospf_is[]={ "down", "loop", "waiting", "point-to-point", "drother",
  "backup", "dr" };

char *ospf_ism[]={ "interface up", "wait timer fired", "backup seen",
  "neighbor change", "loop indicated", "unloop indicated", "interface down"};   

char *ospf_it[]={ "broadcast", "nbma", "point-to-point", "virtual link" };

void
poll_timer_hook(timer *timer)
{
  ospf_hello_send(timer, 1, NULL);
}

void
hello_timer_hook(timer *timer)
{
  ospf_hello_send(timer, 0, NULL);
}

void
wait_timer_hook(timer *timer)
{
  struct ospf_iface *ifa;
  struct proto *p;

  ifa=(struct ospf_iface *)timer->data;
  p=(struct proto *)(ifa->proto);
  OSPF_TRACE(D_EVENTS, "Wait timer fired on interface %s.",
    ifa->iface->name);
  ospf_int_sm(ifa, ISM_WAITF);
}


/**
 * iface_chstate - handle changes of interface state
 * @ifa: OSPF interface
 * @state: new state
 *
 * Many actions must be taken according to interface state changes. New network
 * LSAs must be originated, flushed, new multicast sockets to listen for messages for
 * %ALLDROUTERS have to be opened, etc.
 */
void
iface_chstate(struct ospf_iface *ifa, u8 state)
{
  struct proto_ospf *po=ifa->proto;
  struct proto *p=&po->proto;
  u8 oldstate;

  if(ifa->state!=state)
  {
    OSPF_TRACE(D_EVENTS, "Changing state of iface: %s from \"%s\" into \"%s\".",
      ifa->iface->name, ospf_is[ifa->state], ospf_is[state]);
    oldstate=ifa->state;
    ifa->state=state;
    if(ifa->iface->flags & IF_MULTICAST)
    {
      if((state==OSPF_IS_BACKUP)||(state==OSPF_IS_DR))
      {
        if((ifa->dr_sk==NULL)&&(ifa->type!=OSPF_IT_NBMA))
        {
          DBG("%s: Adding new multicast socket for (B)DR\n", p->name);
          ifa->dr_sk=sk_new(p->pool);
          ifa->dr_sk->type=SK_IP_MC;
	  ifa->dr_sk->sport=0;
	  ifa->dr_sk->dport=OSPF_PROTO;
          ifa->dr_sk->saddr=AllDRouters;
          ifa->dr_sk->daddr=AllDRouters;
          ifa->dr_sk->tos=IP_PREC_INTERNET_CONTROL;
          ifa->dr_sk->ttl=1;
          ifa->dr_sk->rx_hook=ospf_rx_hook;
          ifa->dr_sk->tx_hook=ospf_tx_hook;
          ifa->dr_sk->err_hook=ospf_err_hook;
          ifa->dr_sk->iface=ifa->iface;
          ifa->dr_sk->rbsize=ifa->iface->mtu;
          ifa->dr_sk->tbsize=ifa->iface->mtu;
          ifa->dr_sk->data=(void *)ifa;
          if(sk_open(ifa->dr_sk)!=0)
	  {
	    DBG("%s: SK_OPEN: new? mc open failed.\n", p->name);
	  }
        }
      }
      else
      {
	rfree(ifa->dr_sk);
	ifa->dr_sk=NULL;
      }
      if((oldstate==OSPF_IS_DR)&&(ifa->nlsa!=NULL))
      {
	ifa->nlsa->lsa.age=LSA_MAXAGE;
        if(state>=OSPF_IS_WAITING)
	{
	  net_flush_lsa(ifa->nlsa,po,ifa->oa);
	}
        if(can_flush_lsa(ifa->oa)) flush_lsa(ifa->nlsa,ifa->oa);
        ifa->nlsa=NULL;
      }
    }
  }
}

void
downint(struct ospf_iface *ifa)
{
  struct ospf_neighbor *n,*nx;
  struct proto *p=&ifa->proto->proto;
  struct proto_ospf *po=ifa->proto;

  WALK_LIST_DELSAFE(n,nx,ifa->neigh_list)
  {
    OSPF_TRACE(D_EVENTS, "Removing neighbor %I", n->ip);
    ospf_neigh_remove(n);
  }
  rem_node(NODE ifa);

  rfree(ifa->hello_sk);
  rfree(ifa->dr_sk);
  rfree(ifa->ip_sk);

  rfree(ifa->wait_timer);
  rfree(ifa->hello_timer);
  rfree(ifa->poll_timer);

  rfree(ifa->lock);
  mb_free(ifa);
}

/**
 * ospf_int_sm - OSPF interface state machine
 * @ifa: OSPF interface
 * @event: event comming to state machine
 *
 * This fully respect 9.3 of RFC 2328 except we don't use %LOOP state of
 * interface.
 */
void
ospf_int_sm(struct ospf_iface *ifa, int event)
{
  struct proto *p=(struct proto *)(ifa->proto);
  struct proto_ospf *po=ifa->proto;
  struct ospf_area *oa=ifa->oa;

  OSPF_TRACE(D_EVENTS, "SM on iface %s. Event is \"%s\".",
    ifa->iface->name, ospf_ism[event]);

  switch(event)
  {
    case ISM_UP:
      if(ifa->state==OSPF_IS_DOWN)
      {
        /* Now, nothing should be adjacent */
        tm_start(ifa->hello_timer,ifa->helloint);

        if(ifa->poll_timer)
          tm_start(ifa->poll_timer,ifa->pollint);

        if((ifa->type==OSPF_IT_PTP) || (ifa->type==OSPF_IT_VLINK))
        {
          iface_chstate(ifa, OSPF_IS_PTP);
        }
        else
        {
          if(ifa->priority==0)
          {
            iface_chstate(ifa, OSPF_IS_DROTHER);
          } 
          else
          {
            iface_chstate(ifa, OSPF_IS_WAITING);
            tm_start(ifa->wait_timer,ifa->waitint);
          }
        }
      }
      schedule_rt_lsa(ifa->oa);
      break;
    case ISM_BACKS:
    case ISM_WAITF:
      if(ifa->state==OSPF_IS_WAITING)
      {
        bdr_election(ifa);
      }
      break;
    case ISM_NEICH:
      if((ifa->state==OSPF_IS_DROTHER) || (ifa->state==OSPF_IS_DR) ||
        (ifa->state==OSPF_IS_BACKUP))
      {
        bdr_election(ifa);
        schedule_rt_lsa(ifa->oa);
      }
      break;
    case ISM_DOWN:
      iface_chstate(ifa, OSPF_IS_DOWN);
      downint(ifa);
      schedule_rt_lsa(oa);
      break;
    case ISM_LOOP:	/* Useless? */
      iface_chstate(ifa, OSPF_IS_LOOP);
      downint(ifa);
      schedule_rt_lsa(ifa->oa);
      break;
    case ISM_UNLOOP:
      iface_chstate(ifa, OSPF_IS_DOWN);
      schedule_rt_lsa(ifa->oa);
      break;
    default:
      bug("%s: ISM - Unknown event?",p->name);
      break;
  }
	
}

sock *
ospf_open_mc_socket(struct ospf_iface *ifa)
{
  sock *mcsk;
  struct proto *p;

  p=(struct proto *)(ifa->proto);

  mcsk=sk_new(p->pool);
  mcsk->type=SK_IP_MC;
  mcsk->sport=0;
  mcsk->dport=OSPF_PROTO;
  mcsk->saddr=AllSPFRouters;
  mcsk->daddr=AllSPFRouters;
  mcsk->tos=IP_PREC_INTERNET_CONTROL;
  mcsk->ttl=1;
  mcsk->rx_hook=ospf_rx_hook;
  mcsk->tx_hook=ospf_tx_hook;
  mcsk->err_hook=ospf_err_hook;
  mcsk->iface=ifa->iface;
  mcsk->rbsize=ifa->iface->mtu;
  mcsk->tbsize=ifa->iface->mtu;
  mcsk->data=(void *)ifa;
  if(sk_open(mcsk)!=0)
  {
    DBG("%s: SK_OPEN: mc open failed.\n",p->name);
    return(NULL);
  }
  DBG("%s: SK_OPEN: mc opened.\n",p->name);
  return(mcsk);
}

sock *
ospf_open_ip_socket(struct ospf_iface *ifa)
{
  sock *ipsk;
  struct proto *p;

  p=(struct proto *)(ifa->proto);

  ipsk=sk_new(p->pool);
  ipsk->type=SK_IP;
  ipsk->dport=OSPF_PROTO;
  ipsk->saddr=ifa->iface->addr->ip;
  ipsk->tos=IP_PREC_INTERNET_CONTROL;
  ipsk->ttl=1;
  ipsk->rx_hook=ospf_rx_hook;
  ipsk->tx_hook=ospf_tx_hook;
  ipsk->err_hook=ospf_err_hook;
  ipsk->iface=ifa->iface;
  ipsk->rbsize=ifa->iface->mtu;
  ipsk->tbsize=ifa->iface->mtu;
  ipsk->data=(void *)ifa;
  if(sk_open(ipsk)!=0)
  {
    DBG("%s: SK_OPEN: ip open failed.\n",p->name);
    return(NULL);
  }
  DBG("%s: SK_OPEN: ip opened.\n",p->name);
  return(ipsk);
}

u8
ospf_iface_clasify(struct iface *ifa, struct proto *p)
{
  DBG("%s: Iface flags=%x.\n", p->name, ifa->flags);
  if((ifa->flags & (IF_MULTIACCESS|IF_MULTICAST))==
    (IF_MULTIACCESS|IF_MULTICAST))
  {
     DBG("%s: Clasifying BCAST.\n", p->name);
     return OSPF_IT_BCAST;
  }
  if((ifa->flags & (IF_MULTIACCESS|IF_MULTICAST))==
    IF_MULTIACCESS)
  {
    DBG("%s: Clasifying NBMA.\n", p->name);
    return OSPF_IT_NBMA;
  }
  DBG("%s: Clasifying P-T-P.\n", p->name);
  return OSPF_IT_PTP;
}

struct ospf_iface*
find_iface(struct proto_ospf *p, struct iface *what)
{
  struct ospf_iface *i;

  WALK_LIST (i, p->iface_list)
    if ((i)->iface == what)
      return i;
  return NULL;
}

void
ospf_if_notify(struct proto *p, unsigned flags, struct iface *iface)
{
  struct proto_ospf *po=(struct proto_ospf *)p;
  struct ospf_config *c=(struct ospf_config *)(p->cf);
  struct ospf_area_config *ac;
  struct ospf_iface_patt *ip=NULL;
  struct ospf_iface *ifa;
  struct object_lock *lock;
  struct nbma_node *nbma,*nb;
  u8 i;
  sock *mcsk;


  DBG("%s: If notify called\n", p->name);
  if (iface->flags & IF_IGNORE)
    return;

  if(flags & IF_CHANGE_UP)
  {
    WALK_LIST(ac, c->area_list)
    {
      if(ip=(struct ospf_iface_patt *)
        iface_patt_match(&ac->patt_list, iface)) break;
    }

    if(ip)
    {
      OSPF_TRACE(D_EVENTS, "Using interface %s.", iface->name);

      ifa=mb_allocz(p->pool, sizeof(struct ospf_iface));
      ifa->proto=po;
      ifa->iface=iface;
   
      ifa->an=ac->areaid;
      ifa->cost=ip->cost;
      ifa->rxmtint=ip->rxmtint;
      ifa->inftransdelay=ip->inftransdelay;
      ifa->priority=ip->priority;
      ifa->helloint=ip->helloint;
      ifa->pollint=ip->pollint;
      ifa->strictnbma=ip->strictnbma;
      ifa->waitint=ip->waitint;
      ifa->deadc=ip->deadc;
      ifa->stub=ip->stub;
      ifa->autype=ip->autype;
      memcpy(ifa->aukey,ip->password,8);
      ifa->options=2;	/* FIXME what options? */
   
      if(ip->type==OSPF_IT_UNDEF)
        ifa->type=ospf_iface_clasify(ifa->iface, (struct proto *)ifa->proto);
      else ifa->type=ip->type;

      init_list(&ifa->neigh_list);
      init_list(&ifa->nbma_list);
      WALK_LIST(nb,ip->nbma_list)
      {
        nbma=mb_alloc(p->pool,sizeof(struct nbma_node));
        nbma->ip=nb->ip;
        nbma->eligible=nb->eligible;
        add_tail(&ifa->nbma_list, NODE nbma);
      }
      
      /* Add hello timer */
      ifa->hello_timer=tm_new(p->pool);
      ifa->hello_timer->data=ifa;
      ifa->hello_timer->randomize=0;
      ifa->hello_timer->hook=hello_timer_hook;
      ifa->hello_timer->recurrent=ifa->helloint;
      DBG("%s: Installing hello timer. (%u)\n", p->name, ifa->helloint);
   
      if(ifa->type==OSPF_IT_NBMA)
      {
        ifa->poll_timer=tm_new(p->pool);
        ifa->poll_timer->data=ifa;
        ifa->poll_timer->randomize=0;
        ifa->poll_timer->hook=poll_timer_hook;
        ifa->poll_timer->recurrent=ifa->pollint;
        DBG("%s: Installing poll timer. (%u)\n", p->name, ifa->pollint);
      }
      else ifa->poll_timer=NULL;
   
      ifa->wait_timer=tm_new(p->pool);
      ifa->wait_timer->data=ifa;
      ifa->wait_timer->randomize=0;
      ifa->wait_timer->hook=wait_timer_hook;
      ifa->wait_timer->recurrent=0;
      DBG("%s: Installing wait timer. (%u)\n", p->name, ifa->waitint);
      add_tail(&((struct proto_ospf *)p)->iface_list, NODE ifa);
      ifa->state=OSPF_IS_DOWN;

      lock = olock_new( p->pool );
      lock->addr = AllSPFRouters;
      lock->type = OBJLOCK_IP;
      lock->port = OSPF_PROTO;
      lock->iface = iface;
      lock->data = ifa;
      lock->hook = ospf_ifa_add;
      addifa_rtlsa(ifa);
      olock_acquire(lock);
    }
  }

  if(flags & IF_CHANGE_DOWN)
  {
    if((ifa=find_iface((struct proto_ospf *)p, iface))!=NULL)
    {
      OSPF_TRACE(D_EVENTS, "Killing interface %s.", iface->name);
      ospf_int_sm(ifa, ISM_DOWN);
    }
  }

  if(flags & IF_CHANGE_MTU)
  {
    if((ifa=find_iface((struct proto_ospf *)p, iface))!=NULL)
    {
      struct ospf_packet *op;
      struct ospf_neighbor *n;
      OSPF_TRACE(D_EVENTS, "Changing MTU on interface %s.", iface->name);
      sk_reallocate(ifa->hello_sk);
      sk_reallocate(ifa->dr_sk);
      sk_reallocate(ifa->ip_sk);

      WALK_LIST(n,ifa->neigh_list)
      {
        op = (struct ospf_packet *)n->ldbdes;
        n->ldbdes = mb_allocz(n->pool, iface->mtu);

        if(ntohs(op->length) <= iface->mtu)	/* If the packet in old buffer is bigger, let it filled by zeros */
          memcpy(n->ldbdes, op, iface->mtu);	/* If the packet is old is same or smaller, copy it */

        rfree(op);
      }
    }
  }
}

void
ospf_iface_info(struct ospf_iface *ifa)
{
  int x;
  char *strict="(strict)";

  if((ifa->type!=OSPF_IT_NBMA)||(ifa->strictnbma==0)) strict="";
  cli_msg(-1015,"Interface \"%s\":", ifa->iface->name);
  cli_msg(-1015,"\tArea: %I (%u)", ifa->oa->areaid, ifa->oa->areaid);
  cli_msg(-1015,"\tType: %s %s", ospf_it[ifa->type], strict);
  cli_msg(-1015,"\tState: %s %s", ospf_is[ifa->state],
    ifa->stub ? "(stub)" : "");
  cli_msg(-1015,"\tPriority: %u", ifa->priority);
  cli_msg(-1015,"\tCost: %u", ifa->cost);
  cli_msg(-1015,"\tHello timer: %u", ifa->helloint);
  if(ifa->type==OSPF_IT_NBMA)
  {
    cli_msg(-1015,"\tPoll timer: %u", ifa->pollint);
  }
  cli_msg(-1015,"\tWait timer: %u", ifa->waitint);
  cli_msg(-1015,"\tDead timer: %u", ifa->deadc*ifa->helloint);
  cli_msg(-1015,"\tRetransmit timer: %u", ifa->rxmtint);
  if((ifa->type==OSPF_IT_BCAST)||(ifa->type==OSPF_IT_NBMA))
  {
    cli_msg(-1015,"\tDesigned router (ID): %I", ifa->drid);
    cli_msg(-1015,"\tDesigned router (IP): %I", ifa->drip);
    cli_msg(-1015,"\tBackup designed router (ID): %I", ifa->bdrid);
    cli_msg(-1015,"\tBackup designed router (IP): %I", ifa->bdrip);
  }
}

void
ospf_ifa_add(struct object_lock *lock)
{
  struct ospf_iface *ifa=lock->data;
  struct proto_ospf *po=ifa->proto;
  struct iface *iface=lock->iface;
  struct proto *p=&po->proto;

  ifa->ioprob=OSPF_I_OK;

  if(ifa->type!=OSPF_IT_NBMA)
  {
    if((ifa->hello_sk=ospf_open_mc_socket(ifa))==NULL)
    {
      log("%s: Huh? could not open mc socket on interface %s?", p->name,
        iface->name);
      log("%s: Declaring as stub.", p->name);
      ifa->stub=1;
      ifa->ioprob += OSPF_I_MC;
    }
    ifa->dr_sk=NULL;
  }

  if((ifa->ip_sk=ospf_open_ip_socket(ifa))==NULL)
  {
    log("%s: Huh? could not open ip socket on interface %s?", p->name,
      iface->name);
    log("%s: Declaring as stub.", p->name);
    ifa->stub=1;
    ifa->ioprob += OSPF_I_IP;
  }
  ifa->lock = lock;

  ifa->state=OSPF_IS_DOWN;
  ospf_int_sm(ifa, ISM_UP);
}

void
schedule_net_lsa(struct ospf_iface *ifa)
{
  ifa->orignet=1;
}

void
ospf_iface_shutdown(struct ospf_iface *ifa)
{
  init_list(&ifa->neigh_list);
  hello_timer_hook(ifa->hello_timer);
}