[thirdparty/bird.git] / proto / ospf / hello.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"


#ifdef OSPFv2
struct ospf_hello_packet
{
  struct ospf_packet ospf_packet;
  ip_addr netmask;
  u16 helloint;
  u8 options;
  u8 priority;
  u32 deadint;
  u32 dr;
  u32 bdr;
};
#endif


#ifdef OSPFv3
struct ospf_hello_packet
{
  struct ospf_packet ospf_packet;
  u32 iface_id;
  u8 priority;
  u8 options3;
  u8 options2;
  u8 options;
  u16 helloint;
  u16 deadint;
  u32 dr;
  u32 bdr;
};
#endif


void
ospf_hello_receive(struct ospf_packet *ps_i, struct ospf_iface *ifa,
		   struct ospf_neighbor *n, ip_addr faddr)
{
  struct proto_ospf *po = ifa->oa->po;
  struct proto *p = &po->proto;
  char *beg = "OSPF: Bad HELLO packet from ";
  unsigned int size, i, twoway, oldpriority, eligible, peers;
  u32 olddr, oldbdr, oldiface_id, tmp;
  u32 *pnrid;

  size = ntohs(ps_i->length);
  if (size < sizeof(struct ospf_hello_packet))
  {
    log(L_ERR "%s%I - too short (%u B)", beg, faddr, size);
    return;
  }

  struct ospf_hello_packet *ps = (void *) ps_i;

  OSPF_TRACE(D_PACKETS, "HELLO packet received from %I via %s%s", faddr,
      (ifa->type == OSPF_IT_VLINK ? "vlink-" : ""), ifa->iface->name);

#ifdef OSPFv2
  ip_addr mask = ps->netmask;
  ipa_ntoh(mask);
  if ((ifa->type != OSPF_IT_VLINK) &&
      (ifa->type != OSPF_IT_PTP) &&
      !ipa_equal(mask, ipa_mkmask(ifa->addr->pxlen)))
  {
    log(L_ERR "%s%I - netmask mismatch (%I)", beg, faddr, mask);
    return;
  }
#endif

  tmp = ntohs(ps->helloint);
  if (tmp != ifa->helloint)
  {
    log(L_ERR "%s%I - hello interval mismatch (%d)", beg, faddr, tmp);
    return;
  }

#ifdef OSPFv2
  tmp = ntohl(ps->deadint);
#else /* OSPFv3 */
  tmp = ntohs(ps->deadint);
#endif
  if (tmp != ifa->dead)
  {
    log(L_ERR "%s%I - dead interval mismatch (%d)", beg, faddr, tmp);
    return;
  }

  tmp = !(ps->options & OPT_E);
  if (tmp != ifa->oa->stub)
  {
    log(L_ERR "%s%I - stub area flag mismatch (%d)", beg, faddr, tmp);
    return;
  }

  if (!n)
  {
    if ((ifa->type == OSPF_IT_NBMA))
    {
      struct nbma_node *nn;
      int found = 0;

      WALK_LIST(nn, ifa->nbma_list)
      {
	if (ipa_equal(faddr, nn->ip))
	{
	  found = 1;
	  break;
	}
      }
      if ((found == 0) && (ifa->strictnbma))
      {
	log(L_WARN "Ignoring new neighbor: %I on %s", faddr,
	    ifa->iface->name);
	return;
      }
      if (found)
      {
	eligible = nn->eligible;
	if (((ps->priority == 0) && eligible)
	    || ((ps->priority > 0) && (eligible == 0)))
	{
	  log(L_ERR "Eligibility mismatch for neighbor: %I on %s",
	      faddr, ifa->iface->name);
	  return;
	}
      }
    }
    OSPF_TRACE(D_EVENTS, "New neighbor found: %I on %s", faddr,
	       ifa->iface->name);

    n = ospf_neighbor_new(ifa);

    n->rid = ntohl(((struct ospf_packet *) ps)->routerid);
    n->ip = faddr;
    n->dr = ntohl(ps->dr);
    n->bdr = ntohl(ps->bdr);
    n->priority = ps->priority;
#ifdef OSPFv3
    n->iface_id = ntohl(ps->iface_id);
#endif
  }
  ospf_neigh_sm(n, INM_HELLOREC);

  pnrid = (u32 *) ((struct ospf_hello_packet *) (ps + 1));

  peers = (size - sizeof(struct ospf_hello_packet))/ sizeof(u32);

  twoway = 0;
  for (i = 0; i < peers; i++)
  {
    if (ntohl(pnrid[i]) == po->router_id)
    {
      DBG("%s: Twoway received from %I\n", p->name, faddr);
      ospf_neigh_sm(n, INM_2WAYREC);
      twoway = 1;
      break;
    }
  }

  if (!twoway)
    ospf_neigh_sm(n, INM_1WAYREC);

  olddr = n->dr;
  oldbdr = n->bdr;
  oldpriority = n->priority;
#ifdef OSPFv3
  oldiface_id = n->iface_id;
#endif

  n->dr = ntohl(ps->dr);
  n->bdr = ntohl(ps->bdr);
  n->priority = ps->priority;
#ifdef OSPFv3
  n->iface_id = ntohl(ps->iface_id);
#endif


  /* Check priority change */
  if (n->state >= NEIGHBOR_2WAY)
  {
#ifdef OSPFv2
    u32 neigh = ipa_to_u32(n->ip);
#else /* OSPFv3 */
    u32 neigh = n->rid;
#endif

    if (n->priority != oldpriority)
      ospf_iface_sm(ifa, ISM_NEICH);

#ifdef OSPFv3
    if (n->iface_id != oldiface_id)
      ospf_iface_sm(ifa, ISM_NEICH);
#endif

    /* Neighbor is declaring itself ad DR and there is no BDR */
    if ((n->dr == neigh) && (n->bdr == 0)
	&& (n->state != NEIGHBOR_FULL))
      ospf_iface_sm(ifa, ISM_BACKS);

    /* Neighbor is declaring itself as BDR */
    if ((n->bdr == neigh) && (n->state != NEIGHBOR_FULL))
      ospf_iface_sm(ifa, ISM_BACKS);

    /* Neighbor is newly declaring itself as DR or BDR */
    if (((n->dr == neigh) && (n->dr != olddr))
	|| ((n->bdr == neigh) && (n->bdr != oldbdr)))
      ospf_iface_sm(ifa, ISM_NEICH);

    /* Neighbor is no more declaring itself as DR or BDR */
    if (((olddr == neigh) && (n->dr != olddr))
	|| ((oldbdr == neigh) && (n->bdr != oldbdr)))
      ospf_iface_sm(ifa, ISM_NEICH);
  }

  if (ifa->type == OSPF_IT_NBMA)
  {
    if ((ifa->priority == 0) && (n->priority > 0))
      ospf_hello_send(NULL, 0, n);
  }
  ospf_neigh_sm(n, INM_HELLOREC);
}

void
ospf_hello_send(timer *timer, int poll, struct ospf_neighbor *dirn)
{
  struct ospf_iface *ifa;
  struct ospf_hello_packet *pkt;
  struct ospf_packet *op;
  struct proto *p;
  struct ospf_neighbor *neigh, *n1;
  u16 length;
  u32 *pp;
  int i, send;
  struct nbma_node *nb;

  if (timer == NULL)
    ifa = dirn->ifa;
  else
    ifa = (struct ospf_iface *) timer->data;

  if (ifa->state == OSPF_IS_DOWN)
    return;

  if (ifa->stub)
    return;			/* Don't send any packet on stub iface */

  p = (struct proto *) (ifa->oa->po);
  DBG("%s: Hello/Poll timer fired on interface %s.\n",
      p->name, ifa->iface->name);

  /* Now we should send a hello packet */
  pkt = ospf_tx_buffer();
  op = &pkt->ospf_packet;

  /* Now fill ospf_hello header */
  ospf_pkt_fill_hdr(ifa, pkt, HELLO_P);

#ifdef OSPFv2
  pkt->netmask = ipa_mkmask(ifa->addr->pxlen);
  ipa_hton(pkt->netmask);
  if ((ifa->type == OSPF_IT_VLINK) || (ifa->type == OSPF_IT_PTP))
    pkt->netmask = IPA_NONE;
#endif

  pkt->helloint = ntohs(ifa->helloint);
  pkt->priority = ifa->priority;

#ifdef OSPFv3
  pkt->iface_id = htonl(ifa->iface->index);

  pkt->options3 = ifa->oa->options >> 16;
  pkt->options2 = ifa->oa->options >> 8;
#endif
  pkt->options = ifa->oa->options;

#ifdef OSPFv2
  pkt->deadint = htonl(ifa->dead);
  pkt->dr = htonl(ipa_to_u32(ifa->drip));
  pkt->bdr = htonl(ipa_to_u32(ifa->bdrip));
#else /* OSPFv3 */
  pkt->deadint = htons(ifa->dead);
  pkt->dr = htonl(ifa->drid);
  pkt->bdr = htonl(ifa->bdrid);
#endif

  /* Fill all neighbors */
  i = 0;
  pp = (u32 *) (((u8 *) pkt) + sizeof(struct ospf_hello_packet));
  WALK_LIST(neigh, ifa->neigh_list)
  {
    if ((i+1) * sizeof(u32) + sizeof(struct ospf_hello_packet) > ospf_pkt_maxsize(ifa))
    {
      OSPF_TRACE(D_PACKETS, "Too many neighbors on the interface!");
      break;
    }
    *(pp + i) = htonl(neigh->rid);
    i++;
  }

  length = sizeof(struct ospf_hello_packet) + i * sizeof(u32);
  op->length = htons(length);

  switch(ifa->type)
  {
    case OSPF_IT_NBMA:
      if (timer == NULL)		/* Response to received hello */
      {
        ospf_send_to(ifa, dirn->ip);
      }
      else
      {
        int toall = 0;
        int meeli = 0;
        if (ifa->state > OSPF_IS_DROTHER)
          toall = 1;
        if (ifa->priority > 0)
          meeli = 1;
 
        WALK_LIST(nb, ifa->nbma_list)
        {
          send = 1;
          WALK_LIST(n1, ifa->neigh_list)
          {
            if (ipa_equal(nb->ip, n1->ip))
            {
              send = 0;
              break;
            }
          }
          if ((poll == 1) && (send))
          {
            if (toall || (meeli && nb->eligible))
              ospf_send_to(ifa, nb->ip);
          }
        }
        if (poll == 0)
        {
          WALK_LIST(n1, ifa->neigh_list)
          {
            if (toall || (n1->rid == ifa->drid) || (n1->rid == ifa->bdrid) ||
                (meeli && (n1->priority > 0)))
              ospf_send_to(ifa, n1->ip);
          }
        }
      }
      break;
    case OSPF_IT_VLINK:
      ospf_send_to(ifa, ifa->vip);
      break;
    default:
      ospf_send_to(ifa, AllSPFRouters);
  }

  OSPF_TRACE(D_PACKETS, "HELLO packet sent via %s%s",
	     (ifa->type == OSPF_IT_VLINK ? "vlink-" : ""), ifa->iface->name);
}
Commit	Line	Data
4364b47e OF	1	/*
	2	* BIRD -- OSPF
	3	*
bc4ea680	4	* (c) 1999--2004 Ondrej Filip <feela@network.cz>
4364b47e OF	5	*
	6	* Can be freely distributed and used under the terms of the GNU GPL.
	7	*/
	8
	9	#include "ospf.h"
	10
c3226991 OZ	11
	12	#ifdef OSPFv2
	13	struct ospf_hello_packet
	14	{
	15	struct ospf_packet ospf_packet;
	16	ip_addr netmask;
	17	u16 helloint;
	18	u8 options;
	19	u8 priority;
	20	u32 deadint;
	21	u32 dr;
	22	u32 bdr;
	23	};
	24	#endif
	25
	26
	27	#ifdef OSPFv3
	28	struct ospf_hello_packet
	29	{
	30	struct ospf_packet ospf_packet;
	31	u32 iface_id;
	32	u8 priority;
	33	u8 options3;
	34	u8 options2;
	35	u8 options;
	36	u16 helloint;
	37	u16 deadint;
	38	u32 dr;
	39	u32 bdr;
	40	};
	41	#endif
	42
	43
4364b47e	44	void
c3226991 OZ	45	ospf_hello_receive(struct ospf_packet ps_i, struct ospf_iface ifa,
c3226991 OZ	46	struct ospf_neighbor *n, ip_addr faddr)
4364b47e	47	{
8a70a13e OZ	48	struct proto_ospf *po = ifa->oa->po;
8a70a13e OZ	49	struct proto *p = &po->proto;
353729f5	50	char *beg = "OSPF: Bad HELLO packet from ";
a6bc04d5	51	unsigned int size, i, twoway, oldpriority, eligible, peers;
c3226991	52	u32 olddr, oldbdr, oldiface_id, tmp;
a6bc04d5 OZ	53	u32 *pnrid;
	54
	55	size = ntohs(ps_i->length);
	56	if (size < sizeof(struct ospf_hello_packet))
	57	{
353729f5	58	log(L_ERR "%s%I - too short (%u B)", beg, faddr, size);
a6bc04d5 OZ	59	return;
	60	}
	61
	62	struct ospf_hello_packet ps = (void ) ps_i;
4364b47e	63
8298d780	64	OSPF_TRACE(D_PACKETS, "HELLO packet received from %I via %s%s", faddr,
3b16080c	65	(ifa->type == OSPF_IT_VLINK ? "vlink-" : ""), ifa->iface->name);
c3226991 OZ	66
c3226991 OZ	67	#ifdef OSPFv2
f9c799a0	68	ip_addr mask = ps->netmask;
099c017f	69	ipa_ntoh(mask);
353729f5 OZ	70	if ((ifa->type != OSPF_IT_VLINK) &&
	71	(ifa->type != OSPF_IT_PTP) &&
	72	!ipa_equal(mask, ipa_mkmask(ifa->addr->pxlen)))
	73	{
	74	log(L_ERR "%s%I - netmask mismatch (%I)", beg, faddr, mask);
	75	return;
	76	}
c3226991	77	#endif
77539c44	78
c3226991 OZ	79	tmp = ntohs(ps->helloint);
c3226991 OZ	80	if (tmp != ifa->helloint)
4364b47e	81	{
353729f5	82	log(L_ERR "%s%I - hello interval mismatch (%d)", beg, faddr, tmp);
4364b47e OF	83	return;
	84	}
	85
c3226991 OZ	86	#ifdef OSPFv2
	87	tmp = ntohl(ps->deadint);
	88	#else /* OSPFv3 */
	89	tmp = ntohs(ps->deadint);
	90	#endif
	91	if (tmp != ifa->dead)
4364b47e	92	{
353729f5	93	log(L_ERR "%s%I - dead interval mismatch (%d)", beg, faddr, tmp);
4364b47e OF	94	return;
	95	}
	96
c3226991 OZ	97	tmp = !(ps->options & OPT_E);
c3226991 OZ	98	if (tmp != ifa->oa->stub)
4364b47e	99	{
353729f5	100	log(L_ERR "%s%I - stub area flag mismatch (%d)", beg, faddr, tmp);
4364b47e OF	101	return;
	102	}
	103
5e3436d2	104	if (!n)
4364b47e	105	{
77539c44	106	if ((ifa->type == OSPF_IT_NBMA))
a190e720 OF	107	{
a190e720 OF	108	struct nbma_node *nn;
77539c44	109	int found = 0;
a190e720	110
77539c44	111	WALK_LIST(nn, ifa->nbma_list)
a190e720	112	{
a417ad13	113	if (ipa_equal(faddr, nn->ip))
a190e720	114	{
77539c44	115	found = 1;
a190e720 OF	116	break;
	117	}
	118	}
77539c44	119	if ((found == 0) && (ifa->strictnbma))
a190e720	120	{
353729f5	121	log(L_WARN "Ignoring new neighbor: %I on %s", faddr,
77539c44	122	ifa->iface->name);
a190e720 OF	123	return;
a190e720 OF	124	}
77539c44	125	if (found)
a190e720	126	{
77539c44 OF	127	eligible = nn->eligible;
	128	if (((ps->priority == 0) && eligible)
	129	\|\| ((ps->priority > 0) && (eligible == 0)))
	130	{
	131	log(L_ERR "Eligibility mismatch for neighbor: %I on %s",
	132	faddr, ifa->iface->name);
a190e720	133	return;
77539c44	134	}
a190e720 OF	135	}
a190e720 OF	136	}
353729f5	137	OSPF_TRACE(D_EVENTS, "New neighbor found: %I on %s", faddr,
77539c44	138	ifa->iface->name);
39e517d4 OF	139
	140	n = ospf_neighbor_new(ifa);
	141
5e3436d2	142	n->rid = ntohl(((struct ospf_packet *) ps)->routerid);
77539c44	143	n->ip = faddr;
c3226991 OZ	144	n->dr = ntohl(ps->dr);
c3226991 OZ	145	n->bdr = ntohl(ps->bdr);
77539c44	146	n->priority = ps->priority;
c3226991 OZ	147	#ifdef OSPFv3
	148	n->iface_id = ntohl(ps->iface_id);
	149	#endif
4364b47e OF	150	}
	151	ospf_neigh_sm(n, INM_HELLOREC);
	152
77539c44	153	pnrid = (u32 ) ((struct ospf_hello_packet ) (ps + 1));
4364b47e	154
bc4ea680 OF	155	peers = (size - sizeof(struct ospf_hello_packet))/ sizeof(u32);
bc4ea680 OF	156
77539c44	157	twoway = 0;
bc4ea680	158	for (i = 0; i < peers; i++)
4364b47e	159	{
8a70a13e	160	if (ntohl(pnrid[i]) == po->router_id)
4364b47e	161	{
31dca435	162	DBG("%s: Twoway received from %I\n", p->name, faddr);
4364b47e	163	ospf_neigh_sm(n, INM_2WAYREC);
77539c44	164	twoway = 1;
4364b47e OF	165	break;
	166	}
	167	}
	168
77539c44 OF	169	if (!twoway)
77539c44 OF	170	ospf_neigh_sm(n, INM_1WAYREC);
4364b47e	171
b29c620f	172	olddr = n->dr;
b29c620f	173	oldbdr = n->bdr;
b29c620f	174	oldpriority = n->priority;
c3226991 OZ	175	#ifdef OSPFv3
	176	oldiface_id = n->iface_id;
	177	#endif
	178
	179	n->dr = ntohl(ps->dr);
	180	n->bdr = ntohl(ps->bdr);
b29c620f	181	n->priority = ps->priority;
c3226991 OZ	182	#ifdef OSPFv3
	183	n->iface_id = ntohl(ps->iface_id);
	184	#endif
	185
b29c620f	186
4364b47e	187	/* Check priority change */
77539c44	188	if (n->state >= NEIGHBOR_2WAY)
4364b47e	189	{
c3226991	190	#ifdef OSPFv2
8a70a13e	191	u32 neigh = ipa_to_u32(n->ip);
c3226991	192	#else /* OSPFv3 */
8a70a13e	193	u32 neigh = n->rid;
c3226991 OZ	194	#endif
c3226991 OZ	195
77539c44	196	if (n->priority != oldpriority)
a5918961	197	ospf_iface_sm(ifa, ISM_NEICH);
4364b47e	198
c3226991 OZ	199	#ifdef OSPFv3
	200	if (n->iface_id != oldiface_id)
	201	ospf_iface_sm(ifa, ISM_NEICH);
	202	#endif
	203
8a70a13e OZ	204	/* Neighbor is declaring itself ad DR and there is no BDR */
8a70a13e OZ	205	if ((n->dr == neigh) && (n->bdr == 0)
77539c44	206	&& (n->state != NEIGHBOR_FULL))
a5918961	207	ospf_iface_sm(ifa, ISM_BACKS);
4364b47e	208
b29c620f	209	/* Neighbor is declaring itself as BDR */
8a70a13e	210	if ((n->bdr == neigh) && (n->state != NEIGHBOR_FULL))
a5918961	211	ospf_iface_sm(ifa, ISM_BACKS);
b29c620f OF	212
b29c620f OF	213	/* Neighbor is newly declaring itself as DR or BDR */
8a70a13e OZ	214	if (((n->dr == neigh) && (n->dr != olddr))
8a70a13e OZ	215	\|\| ((n->bdr == neigh) && (n->bdr != oldbdr)))
a5918961	216	ospf_iface_sm(ifa, ISM_NEICH);
b29c620f OF	217
b29c620f OF	218	/* Neighbor is no more declaring itself as DR or BDR */
8a70a13e OZ	219	if (((olddr == neigh) && (n->dr != olddr))
8a70a13e OZ	220	\|\| ((oldbdr == neigh) && (n->bdr != oldbdr)))
a5918961	221	ospf_iface_sm(ifa, ISM_NEICH);
4364b47e	222	}
4364b47e	223
3b16080c	224	if (ifa->type == OSPF_IT_NBMA)
a190e720	225	{
77539c44 OF	226	if ((ifa->priority == 0) && (n->priority > 0))
77539c44 OF	227	ospf_hello_send(NULL, 0, n);
a190e720	228	}
4364b47e OF	229	ospf_neigh_sm(n, INM_HELLOREC);
	230	}
	231
a190e720	232	void
c3226991	233	ospf_hello_send(timer timer, int poll, struct ospf_neighbor dirn)
4364b47e OF	234	{
	235	struct ospf_iface *ifa;
	236	struct ospf_hello_packet *pkt;
	237	struct ospf_packet *op;
	238	struct proto *p;
98ac6176	239	struct ospf_neighbor neigh, n1;
4364b47e OF	240	u16 length;
4364b47e OF	241	u32 *pp;
98ac6176 OF	242	int i, send;
98ac6176 OF	243	struct nbma_node *nb;
86c84d76	244
77539c44 OF	245	if (timer == NULL)
	246	ifa = dirn->ifa;
	247	else
	248	ifa = (struct ospf_iface *) timer->data;
a190e720	249
98ac6176 OF	250	if (ifa->state == OSPF_IS_DOWN)
	251	return;
	252
77539c44 OF	253	if (ifa->stub)
77539c44 OF	254	return; /* Don't send any packet on stub iface */
e3bc10fd	255
86c84d76	256	p = (struct proto *) (ifa->oa->po);
a190e720	257	DBG("%s: Hello/Poll timer fired on interface %s.\n",
77539c44	258	p->name, ifa->iface->name);
4364b47e	259
f9c799a0	260	/* Now we should send a hello packet */
353729f5 OZ	261	pkt = ospf_tx_buffer();
353729f5 OZ	262	op = &pkt->ospf_packet;
4364b47e	263
f9c799a0	264	/* Now fill ospf_hello header */
3e2bd0f1	265	ospf_pkt_fill_hdr(ifa, pkt, HELLO_P);
e5b5d18c	266
c3226991	267	#ifdef OSPFv2
353729f5	268	pkt->netmask = ipa_mkmask(ifa->addr->pxlen);
e5b5d18c	269	ipa_hton(pkt->netmask);
f571473e OZ	270	if ((ifa->type == OSPF_IT_VLINK) \|\| (ifa->type == OSPF_IT_PTP))
f571473e OZ	271	pkt->netmask = IPA_NONE;
c3226991 OZ	272	#endif
c3226991 OZ	273
77539c44	274	pkt->helloint = ntohs(ifa->helloint);
77539c44	275	pkt->priority = ifa->priority;
c3226991 OZ	276
	277	#ifdef OSPFv3
	278	pkt->iface_id = htonl(ifa->iface->index);
	279
	280	pkt->options3 = ifa->oa->options >> 16;
	281	pkt->options2 = ifa->oa->options >> 8;
	282	#endif
	283	pkt->options = ifa->oa->options;
	284
	285	#ifdef OSPFv2
d8c7d9e8	286	pkt->deadint = htonl(ifa->dead);
c3226991 OZ	287	pkt->dr = htonl(ipa_to_u32(ifa->drip));
	288	pkt->bdr = htonl(ipa_to_u32(ifa->bdrip));
	289	#else /* OSPFv3 */
	290	pkt->deadint = htons(ifa->dead);
	291	pkt->dr = htonl(ifa->drid);
	292	pkt->bdr = htonl(ifa->bdrid);
	293	#endif
e5b5d18c OF	294
e5b5d18c OF	295	/* Fill all neighbors */
77539c44 OF	296	i = 0;
	297	pp = (u32 ) (((u8 ) pkt) + sizeof(struct ospf_hello_packet));
	298	WALK_LIST(neigh, ifa->neigh_list)
e5b5d18c	299	{
3e2bd0f1 OF	300	if ((i+1) * sizeof(u32) + sizeof(struct ospf_hello_packet) > ospf_pkt_maxsize(ifa))
	301	{
	302	OSPF_TRACE(D_PACKETS, "Too many neighbors on the interface!");
	303	break;
	304	}
77539c44	305	*(pp + i) = htonl(neigh->rid);
e5b5d18c OF	306	i++;
	307	}
	308
77539c44 OF	309	length = sizeof(struct ospf_hello_packet) + i * sizeof(u32);
77539c44 OF	310	op->length = htons(length);
e5b5d18c	311
98ac6176	312	switch(ifa->type)
e5b5d18c	313	{
98ac6176 OF	314	case OSPF_IT_NBMA:
98ac6176 OF	315	if (timer == NULL) /* Response to received hello */
e5b5d18c	316	{
f9c799a0	317	ospf_send_to(ifa, dirn->ip);
e5b5d18c	318	}
98ac6176	319	else
a190e720	320	{
98ac6176 OF	321	int toall = 0;
	322	int meeli = 0;
	323	if (ifa->state > OSPF_IS_DROTHER)
	324	toall = 1;
	325	if (ifa->priority > 0)
	326	meeli = 1;
	327
	328	WALK_LIST(nb, ifa->nbma_list)
	329	{
	330	send = 1;
	331	WALK_LIST(n1, ifa->neigh_list)
	332	{
a417ad13	333	if (ipa_equal(nb->ip, n1->ip))
98ac6176 OF	334	{
	335	send = 0;
	336	break;
	337	}
	338	}
	339	if ((poll == 1) && (send))
	340	{
	341	if (toall \|\| (meeli && nb->eligible))
f9c799a0	342	ospf_send_to(ifa, nb->ip);
98ac6176 OF	343	}
	344	}
	345	if (poll == 0)
	346	{
	347	WALK_LIST(n1, ifa->neigh_list)
	348	{
	349	if (toall \|\| (n1->rid == ifa->drid) \|\| (n1->rid == ifa->bdrid) \|\|
	350	(meeli && (n1->priority > 0)))
f9c799a0	351	ospf_send_to(ifa, n1->ip);
98ac6176 OF	352	}
98ac6176 OF	353	}
a190e720	354	}
98ac6176 OF	355	break;
98ac6176 OF	356	case OSPF_IT_VLINK:
f9c799a0	357	ospf_send_to(ifa, ifa->vip);
98ac6176 OF	358	break;
98ac6176 OF	359	default:
f9c799a0	360	ospf_send_to(ifa, AllSPFRouters);
e5b5d18c	361	}
8298d780 OZ	362
	363	OSPF_TRACE(D_PACKETS, "HELLO packet sent via %s%s",
	364	(ifa->type == OSPF_IT_VLINK ? "vlink-" : ""), ifa->iface->name);
4364b47e	365	}