[thirdparty/bird.git] / proto / ospf / dbdes.c

/*
 *	BIRD -- OSPF
 *
 *	(c) 1999 - 2000 Ondrej Filip <feela@network.cz>
 *
 *	Can be freely distributed and used under the terms of the GNU GPL.
 */

#include "ospf.h"

/**
 * ospf_dbdes_tx - transmit database description packet
 * @n: neighbor
 *
 * Sending of database description packet is described in 10.6 of RFC 2328.
 * Reception of each packet is acknoledged in sequence number of another.
 * When I send a packet to neighbor I keep a copy in buffer. If neighbor
 * does not reply, I don't create new packet but I just send content
 * of buffer.
 */
void
ospf_dbdes_tx(struct ospf_neighbor *n)
{
  struct ospf_dbdes_packet *pkt;
  struct ospf_packet *op;
  struct ospf_iface *ifa=n->ifa;
  struct ospf_area *oa=ifa->oa;
  u16 length;
  struct proto *p;
  u16 i,j;
  u8 *aa,*bb;

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

  switch(n->state)
  {
    case NEIGHBOR_EXSTART:		/* Send empty packets */
      n->myimms.bit.i=1;
      pkt=(struct ospf_dbdes_packet *)(ifa->ip_sk->tbuf);
      op=(struct ospf_packet *)pkt;
      fill_ospf_pkt_hdr(ifa, pkt, DBDES_P);
      pkt->iface_mtu=htons(ifa->iface->mtu);	/* FIXME NOT for VLINK! */
      pkt->options= ifa->options;
      pkt->imms=n->myimms;
      pkt->ddseq=htonl(n->dds);
      length=sizeof(struct ospf_dbdes_packet);
      op->length=htons(length);
      ospf_pkt_finalize(ifa, op);
      sk_send_to(ifa->ip_sk,length, n->ip, OSPF_PROTO);
      OSPF_TRACE(D_PACKETS, "DB_DES (I) sent to %I via %s.", n->ip,
        ifa->iface->name);
      break;

    case NEIGHBOR_EXCHANGE:
      n->myimms.bit.i=0;

      if(oa->rt==NULL) originate_rt_lsa(oa);
      oa->origrt=0;

      if(((n->myimms.bit.ms) && (n->dds==n->ddr+1)) ||
         ((!(n->myimms.bit.ms)) && (n->dds==n->ddr)))
      {
        snode *sn;			/* Send next */
        struct ospf_lsa_header *lsa;

	pkt=n->ldbdes;
        op=(struct ospf_packet *)pkt;
	
        fill_ospf_pkt_hdr(ifa, pkt, DBDES_P);
        pkt->iface_mtu=htons(ifa->iface->mtu);
        pkt->options= ifa->options;
	pkt->ddseq=htonl(n->dds);

	j=i=(ifa->iface->mtu-sizeof(struct ospf_dbdes_packet)-SIPH)/
		sizeof(struct ospf_lsa_header);	/* Number of lsaheaders */
	lsa=(n->ldbdes+sizeof(struct ospf_dbdes_packet));

	if(n->myimms.bit.m)
	{
	  sn=s_get(&(n->dbsi));

	  DBG("Number of LSA: %d\n", j);
	  for(;i>0;i--)
	  {
	    struct top_hash_entry *en;
	  
	    en=(struct top_hash_entry *)sn;
	    htonlsah(&(en->lsa), lsa);
	    DBG("Working on: %d\n", i);
            DBG("\tX%01x %08I %08I %p\n", en->lsa.type, en->lsa.id,
              en->lsa.rt, en->lsa_body);

	    if(sn==STAIL(n->ifa->oa->lsal))
	    {
	      i--;
	      break;	/* Should set some flag? */
  	    }
	    sn=sn->next;
	    lsa++;
	  }

	  if(sn==STAIL(n->ifa->oa->lsal))
	  {
	    DBG("Number of LSA NOT sent: %d\n", i);
	    DBG("M bit unset.\n");
	    n->myimms.bit.m=0;	/* Unset more bit */
	  }
	  else s_put(&(n->dbsi),sn);
	}

        pkt->imms.byte=n->myimms.byte;

	length=(j-i)*sizeof(struct ospf_lsa_header)+
		sizeof(struct ospf_dbdes_packet);
	op->length=htons(length);
	
        ospf_pkt_finalize(ifa, op);
        DBG("%s: DB_DES (M) sent to %I.\n", p->name, n->ip);
      }

    case NEIGHBOR_LOADING:
    case NEIGHBOR_FULL:
      aa=ifa->ip_sk->tbuf;
      bb=n->ldbdes;
      op=n->ldbdes;
      length=ntohs(op->length);

      for(i=0; i<length; i++)
      {
        *(aa+i)=*(bb+i);	/* Copy last sent packet again */
      }

      sk_send_to(ifa->ip_sk,length, n->ip, OSPF_PROTO);
      OSPF_TRACE(D_PACKETS, "DB_DES (M) sent to %I via %s.", n->ip,
        ifa->iface->name);
      if(n->myimms.bit.ms) tm_start(n->rxmt_timer,ifa->rxmtint);
      else
      {
        if((n->myimms.bit.m==0) && (n->imms.bit.m==0) &&
          (n->state==NEIGHBOR_EXCHANGE))
	{
          ospf_neigh_sm(n, INM_EXDONE);
	  if(n->myimms.bit.ms) tm_stop(n->rxmt_timer);
	  else tm_start(n->rxmt_timer,ifa->rxmtint);
	}
      }
      break;

    default:				/* Ignore it */
      bug("Bug in dbdes sending");
      break;
  }
}

void
rxmt_timer_hook(timer *timer)
{
  struct ospf_iface *ifa;
  struct proto *p;
  struct ospf_neighbor *n;

  n=(struct ospf_neighbor *)timer->data;
  ifa=n->ifa;
  p=(struct proto *)(ifa->proto);
  DBG("%s: RXMT timer fired on interface %s for neigh: %I.\n",
    p->name, ifa->iface->name, n->ip);
  if(n->state<NEIGHBOR_LOADING) ospf_dbdes_tx(n);
  else
  {
    tm_stop(n->rxmt_timer);
  }
}

void
ospf_dbdes_reqladd(struct ospf_dbdes_packet *ps, struct proto *p,
  struct ospf_neighbor *n)
{
  struct ospf_lsa_header *plsa,lsa;
  struct top_hash_entry *he,*sn;
  struct top_graph *gr;
  struct ospf_packet *op;
  int i,j;

  gr=n->ifa->oa->gr;
  op=(struct ospf_packet *)ps;

  plsa=(void *)(ps+1);

  j=(ntohs(op->length)-sizeof(struct ospf_dbdes_packet))/
    sizeof( struct ospf_lsa_header);

  for(i=0;i<j;i++)
  {
    ntohlsah(plsa+i, &lsa);
    if(((he=ospf_hash_find(gr,lsa.id,lsa.rt,lsa.type))==NULL)||
      (lsa_comp(&lsa, &(he->lsa))==1))
    {
      /* Is this condition necessary? */
      if(ospf_hash_find(n->lsrqh,lsa.id,lsa.rt,lsa.type)==NULL)
      {
        sn=ospf_hash_get(n->lsrqh,lsa.id,lsa.rt,lsa.type);
        ntohlsah(plsa+i, &(sn->lsa));
        s_add_tail(&(n->lsrql), SNODE sn);
      }
    }
  }
}

void
ospf_dbdes_rx(struct ospf_dbdes_packet *ps, struct proto *p,
  struct ospf_iface *ifa, u16 size)
{
  u32 nrid, myrid;
  struct ospf_neighbor *n;
  u8 i;

  nrid=ntohl(((struct ospf_packet *)ps)->routerid);

  myrid=p->cf->global->router_id;

  if((n=find_neigh(ifa, nrid))==NULL)
  {
    OSPF_TRACE(D_PACKETS, "Received dbdes from unknown neigbor! %I.",
      nrid);
    return ;
  }

  if(ifa->iface->mtu<size)
  {
    OSPF_TRACE(D_PACKETS, "Received dbdes larger than MTU from %I!", n->ip);
    return ;
  }

  OSPF_TRACE(D_PACKETS, "Received dbdes from %I via %s.", n->ip,
    ifa->iface->name);
  ospf_neigh_sm(n, INM_HELLOREC);

  switch(n->state)
  {
    case NEIGHBOR_DOWN:
    case NEIGHBOR_ATTEMPT:
    case NEIGHBOR_2WAY:
        return;
      break;
    case NEIGHBOR_INIT:
        ospf_neigh_sm(n, INM_2WAYREC);
	if(n->state!=NEIGHBOR_EXSTART) return;
    case NEIGHBOR_EXSTART:
        if((ps->imms.bit.m && ps->imms.bit.ms && ps->imms.bit.i)
          && (n->rid > myrid) &&
          (size == sizeof(struct ospf_dbdes_packet)))
        {
          /* I'm slave! */
          n->dds=ntohl(ps->ddseq);
	  n->ddr=ntohl(ps->ddseq);
	  n->options=ps->options;
	  n->myimms.bit.ms=0;
	  n->imms.byte=ps->imms.byte;
          OSPF_TRACE(D_PACKETS, "I'm slave to %I.", n->ip);
	  ospf_neigh_sm(n, INM_NEGDONE);
	  tm_stop(n->rxmt_timer);
	  ospf_dbdes_tx(n);
	  break;
        }
        else
        {
          if(((ps->imms.bit.i==0) && (ps->imms.bit.ms==0)) &&
            (n->rid < myrid) && (n->dds == ntohl(ps->ddseq)))
          {
            /* I'm master! */
	    n->options=ps->options;
            n->ddr=ntohl(ps->ddseq)-1;
            n->imms.byte=ps->imms.byte;
            OSPF_TRACE(D_PACKETS, "I'm master to %I.", nrid);
	    ospf_neigh_sm(n, INM_NEGDONE);
          }
	  else
          {
            DBG("%s: Nothing happend to %I (imms=%u)\n", p->name, n->ip,
              ps->imms.byte);
            break;
          }
        }
        if(ps->imms.bit.i) break;
    case NEIGHBOR_EXCHANGE:
	if((ps->imms.byte==n->imms.byte) && (ps->options=n->options) &&
	  (ntohl(ps->ddseq)==n->ddr))
        {
          /* Duplicate packet */
          OSPF_TRACE(D_PACKETS, "Received duplicate dbdes from %I.", n->ip);
	  if(n->imms.bit.ms==0)
	  {
            ospf_dbdes_tx(n);
	  }
          return;
        }

        n->ddr=ntohl(ps->ddseq);

	if(ps->imms.bit.ms!=n->imms.bit.ms) /* M/S bit differs */
        {
          DBG("SEQMIS-BIT-MS\n");
          ospf_neigh_sm(n, INM_SEQMIS);
	  break;
        }

	if(ps->imms.bit.i)	/* I bit is set */
        {
          DBG("SEQMIS-BIT-I\n");
          ospf_neigh_sm(n, INM_SEQMIS);
	  break;
        }

	n->imms.byte=ps->imms.byte;

	if(ps->options!=n->options)	/* Options differs */
        {
          DBG("SEQMIS-OPT\n");
          ospf_neigh_sm(n, INM_SEQMIS);
	  break;
        }

	if(n->myimms.bit.ms)
        {
          if(ntohl(ps->ddseq)!=n->dds)		/* MASTER */
	  {
            DBG("SEQMIS-MASTER\n");
	    ospf_neigh_sm(n, INM_SEQMIS);
	    break;
	  }
	  n->dds++;
          DBG("Incrementing dds\n");
	  ospf_dbdes_reqladd(ps,p,n);
	  if((n->myimms.bit.m==0) && (ps->imms.bit.m==0))
	  {
	    ospf_neigh_sm(n, INM_EXDONE);
	  }
	  else
	  {
	    ospf_dbdes_tx(n);
	  }

        }
	else
        {
          if(ntohl(ps->ddseq)!=(n->dds+1))	/* SLAVE */
	  {
            DBG("SEQMIS-SLAVE\n");
	    ospf_neigh_sm(n, INM_SEQMIS);
	    break;
	  }
	  n->ddr=ntohl(ps->ddseq);
	  n->dds=ntohl(ps->ddseq);
	  ospf_dbdes_reqladd(ps,p,n);
	  ospf_dbdes_tx(n);
        }

      break;
    case NEIGHBOR_LOADING:
    case NEIGHBOR_FULL:
	if((ps->imms.byte==n->imms.byte) && (ps->options=n->options) &&
	  (ps->ddseq==n->dds)) /* Only duplicate are accepted */
        {
          OSPF_TRACE(D_PACKETS, "Received duplicate dbdes from %I.",n->ip);
          return;
        }
	else
        {
	  DBG("SEQMIS-FULL\n");
	  ospf_neigh_sm(n, INM_SEQMIS);
        }
      break;
    defaut:
      bug("%s: Received dbdes from %I in undefined state.", p->name, n->ip);
      break;
   }
}
Commit	Line	Data
4364b47e OF	1	/*
	2	* BIRD -- OSPF
	3	*
eee9cefd	4	* (c) 1999 - 2000 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
eee9cefd OF	11	/**
	12	* ospf_dbdes_tx - transmit database description packet
	13	* @n: neighbor
	14	*
	15	* Sending of database description packet is described in 10.6 of RFC 2328.
	16	* Reception of each packet is acknoledged in sequence number of another.
	17	* When I send a packet to neighbor I keep a copy in buffer. If neighbor
	18	* does not reply, I don't create new packet but I just send content
	19	* of buffer.
	20	*/
4364b47e OF	21	void
	22	ospf_dbdes_tx(struct ospf_neighbor *n)
	23	{
	24	struct ospf_dbdes_packet *pkt;
	25	struct ospf_packet *op;
394920a0	26	struct ospf_iface *ifa=n->ifa;
38203d78	27	struct ospf_area *oa=ifa->oa;
4364b47e OF	28	u16 length;
4364b47e OF	29	struct proto *p;
30147b89 OF	30	u16 i,j;
30147b89 OF	31	u8 aa,bb;
4364b47e	32
4364b47e OF	33	p=(struct proto *)(ifa->proto);
	34
	35	switch(n->state)
	36	{
	37	case NEIGHBOR_EXSTART: /* Send empty packets */
96501dfe	38	n->myimms.bit.i=1;
963ea03d OF	39	pkt=(struct ospf_dbdes_packet *)(ifa->ip_sk->tbuf);
963ea03d OF	40	op=(struct ospf_packet *)pkt;
89d6782d	41	fill_ospf_pkt_hdr(ifa, pkt, DBDES_P);
496c819f	42	pkt->iface_mtu=htons(ifa->iface->mtu); /* FIXME NOT for VLINK! */
4364b47e OF	43	pkt->options= ifa->options;
4364b47e OF	44	pkt->imms=n->myimms;
910e557b	45	pkt->ddseq=htonl(n->dds);
4364b47e OF	46	length=sizeof(struct ospf_dbdes_packet);
	47	op->length=htons(length);
	48	ospf_pkt_finalize(ifa, op);
	49	sk_send_to(ifa->ip_sk,length, n->ip, OSPF_PROTO);
abcbfd04	50	OSPF_TRACE(D_PACKETS, "DB_DES (I) sent to %I via %s.", n->ip,
394920a0	51	ifa->iface->name);
30147b89 OF	52	break;
	53
	54	case NEIGHBOR_EXCHANGE:
96501dfe	55	n->myimms.bit.i=0;
5f743d96	56
38203d78 OF	57	if(oa->rt==NULL) originate_rt_lsa(oa);
	58	oa->origrt=0;
	59
910e557b OF	60	if(((n->myimms.bit.ms) && (n->dds==n->ddr+1)) \|\|
910e557b OF	61	((!(n->myimms.bit.ms)) && (n->dds==n->ddr)))
30147b89 OF	62	{
30147b89 OF	63	snode sn; / Send next */
ce17d4c1	64	struct ospf_lsa_header *lsa;
963ea03d OF	65
	66	pkt=n->ldbdes;
	67	op=(struct ospf_packet *)pkt;
30147b89	68
89d6782d	69	fill_ospf_pkt_hdr(ifa, pkt, DBDES_P);
963ea03d	70	pkt->iface_mtu=htons(ifa->iface->mtu);
30147b89	71	pkt->options= ifa->options;
910e557b	72	pkt->ddseq=htonl(n->dds);
30147b89	73
5f743d96	74	j=i=(ifa->iface->mtu-sizeof(struct ospf_dbdes_packet)-SIPH)/
ce17d4c1	75	sizeof(struct ospf_lsa_header); /* Number of lsaheaders */
30147b89 OF	76	lsa=(n->ldbdes+sizeof(struct ospf_dbdes_packet));
30147b89 OF	77
910e557b OF	78	if(n->myimms.bit.m)
910e557b OF	79	{
2560c886	80	sn=s_get(&(n->dbsi));
910e557b	81
2560c886 OF	82	DBG("Number of LSA: %d\n", j);
	83	for(;i>0;i--)
	84	{
	85	struct top_hash_entry *en;
30147b89	86
2560c886 OF	87	en=(struct top_hash_entry *)sn;
	88	htonlsah(&(en->lsa), lsa);
	89	DBG("Working on: %d\n", i);
5f743d96	90	DBG("\tX%01x %08I %08I %p\n", en->lsa.type, en->lsa.id,
2560c886 OF	91	en->lsa.rt, en->lsa_body);
2560c886 OF	92
d8852b36	93	if(sn==STAIL(n->ifa->oa->lsal))
2560c886	94	{
5f743d96	95	i--;
0884f492	96	break; /* Should set some flag? */
2560c886 OF	97	}
	98	sn=sn->next;
	99	lsa++;
	100	}
963ea03d	101
d8852b36	102	if(sn==STAIL(n->ifa->oa->lsal))
30147b89	103	{
2560c886 OF	104	DBG("Number of LSA NOT sent: %d\n", i);
	105	DBG("M bit unset.\n");
	106	n->myimms.bit.m=0; /* Unset more bit */
30147b89	107	}
5f743d96	108	else s_put(&(n->dbsi),sn);
910e557b	109	}
963ea03d	110
96501dfe	111	pkt->imms.byte=n->myimms.byte;
30147b89	112
963ea03d	113	length=(j-i)*sizeof(struct ospf_lsa_header)+
ce17d4c1	114	sizeof(struct ospf_dbdes_packet);
30147b89	115	op->length=htons(length);
96501dfe	116
30147b89	117	ospf_pkt_finalize(ifa, op);
394920a0	118	DBG("%s: DB_DES (M) sent to %I.\n", p->name, n->ip);
30147b89 OF	119	}
30147b89 OF	120
910e557b OF	121	case NEIGHBOR_LOADING:
910e557b OF	122	case NEIGHBOR_FULL:
30147b89 OF	123	aa=ifa->ip_sk->tbuf;
30147b89 OF	124	bb=n->ldbdes;
963ea03d	125	op=n->ldbdes;
30147b89 OF	126	length=ntohs(op->length);
30147b89 OF	127
5f743d96	128	for(i=0; i<length; i++)
30147b89	129	{
96501dfe	130	(aa+i)=(bb+i); /* Copy last sent packet again */
30147b89	131	}
04c6319a	132
30147b89	133	sk_send_to(ifa->ip_sk,length, n->ip, OSPF_PROTO);
abcbfd04	134	OSPF_TRACE(D_PACKETS, "DB_DES (M) sent to %I via %s.", n->ip,
394920a0	135	ifa->iface->name);
910e557b OF	136	if(n->myimms.bit.ms) tm_start(n->rxmt_timer,ifa->rxmtint);
	137	else
	138	{
	139	if((n->myimms.bit.m==0) && (n->imms.bit.m==0) &&
	140	(n->state==NEIGHBOR_EXCHANGE))
	141	{
	142	ospf_neigh_sm(n, INM_EXDONE);
	143	if(n->myimms.bit.ms) tm_stop(n->rxmt_timer);
	144	else tm_start(n->rxmt_timer,ifa->rxmtint);
	145	}
	146	}
	147	break;
4364b47e	148
4364b47e	149	default: /* Ignore it */
fef1badf	150	bug("Bug in dbdes sending");
4364b47e OF	151	break;
	152	}
	153	}
	154
	155	void
	156	rxmt_timer_hook(timer *timer)
	157	{
	158	struct ospf_iface *ifa;
	159	struct proto *p;
	160	struct ospf_neighbor *n;
	161
910e557b OF	162	n=(struct ospf_neighbor *)timer->data;
910e557b OF	163	ifa=n->ifa;
4364b47e	164	p=(struct proto *)(ifa->proto);
9669362f	165	DBG("%s: RXMT timer fired on interface %s for neigh: %I.\n",
353f3261	166	p->name, ifa->iface->name, n->ip);
910e557b	167	if(n->state<NEIGHBOR_LOADING) ospf_dbdes_tx(n);
2560c886 OF	168	else
	169	{
	170	tm_stop(n->rxmt_timer);
2560c886	171	}
910e557b OF	172	}
910e557b OF	173
910e557b OF	174	void
	175	ospf_dbdes_reqladd(struct ospf_dbdes_packet ps, struct proto p,
	176	struct ospf_neighbor *n)
	177	{
	178	struct ospf_lsa_header *plsa,lsa;
	179	struct top_hash_entry he,sn;
	180	struct top_graph *gr;
6d2b3211 OF	181	struct ospf_packet *op;
6d2b3211 OF	182	int i,j;
910e557b OF	183
910e557b OF	184	gr=n->ifa->oa->gr;
6d2b3211	185	op=(struct ospf_packet *)ps;
910e557b OF	186
910e557b OF	187	plsa=(void *)(ps+1);
6d2b3211 OF	188
	189	j=(ntohs(op->length)-sizeof(struct ospf_dbdes_packet))/
	190	sizeof( struct ospf_lsa_header);
	191
	192	for(i=0;i<j;i++)
	193	{
95eb1dba	194	ntohlsah(plsa+i, &lsa);
95eb1dba OF	195	if(((he=ospf_hash_find(gr,lsa.id,lsa.rt,lsa.type))==NULL)\|\|
	196	(lsa_comp(&lsa, &(he->lsa))==1))
	197	{
394acced	198	/* Is this condition necessary? */
95eb1dba OF	199	if(ospf_hash_find(n->lsrqh,lsa.id,lsa.rt,lsa.type)==NULL)
	200	{
	201	sn=ospf_hash_get(n->lsrqh,lsa.id,lsa.rt,lsa.type);
	202	ntohlsah(plsa+i, &(sn->lsa));
	203	s_add_tail(&(n->lsrql), SNODE sn);
	204	}
	205	}
6d2b3211	206	}
4364b47e OF	207	}
	208
	209	void
	210	ospf_dbdes_rx(struct ospf_dbdes_packet ps, struct proto p,
	211	struct ospf_iface *ifa, u16 size)
	212	{
	213	u32 nrid, myrid;
	214	struct ospf_neighbor *n;
	215	u8 i;
	216
	217	nrid=ntohl(((struct ospf_packet *)ps)->routerid);
	218
	219	myrid=p->cf->global->router_id;
	220
	221	if((n=find_neigh(ifa, nrid))==NULL)
	222	{
abcbfd04	223	OSPF_TRACE(D_PACKETS, "Received dbdes from unknown neigbor! %I.",
4364b47e OF	224	nrid);
	225	return ;
	226	}
	227
	228	if(ifa->iface->mtu<size)
	229	{
abcbfd04	230	OSPF_TRACE(D_PACKETS, "Received dbdes larger than MTU from %I!", n->ip);
4364b47e OF	231	return ;
	232	}
	233
abcbfd04	234	OSPF_TRACE(D_PACKETS, "Received dbdes from %I via %s.", n->ip,
394920a0	235	ifa->iface->name);
4bb9ce56	236	ospf_neigh_sm(n, INM_HELLOREC);
353f3261	237
4364b47e OF	238	switch(n->state)
	239	{
	240	case NEIGHBOR_DOWN:
	241	case NEIGHBOR_ATTEMPT:
	242	case NEIGHBOR_2WAY:
4364b47e OF	243	return;
	244	break;
	245	case NEIGHBOR_INIT:
	246	ospf_neigh_sm(n, INM_2WAYREC);
	247	if(n->state!=NEIGHBOR_EXSTART) return;
	248	case NEIGHBOR_EXSTART:
04c6319a OF	249	if((ps->imms.bit.m && ps->imms.bit.ms && ps->imms.bit.i)
04c6319a OF	250	&& (n->rid > myrid) &&
4364b47e OF	251	(size == sizeof(struct ospf_dbdes_packet)))
	252	{
	253	/* I'm slave! */
910e557b OF	254	n->dds=ntohl(ps->ddseq);
910e557b OF	255	n->ddr=ntohl(ps->ddseq);
4364b47e	256	n->options=ps->options;
04c6319a	257	n->myimms.bit.ms=0;
04c6319a	258	n->imms.byte=ps->imms.byte;
abcbfd04	259	OSPF_TRACE(D_PACKETS, "I'm slave to %I.", n->ip);
4364b47e	260	ospf_neigh_sm(n, INM_NEGDONE);
910e557b OF	261	tm_stop(n->rxmt_timer);
	262	ospf_dbdes_tx(n);
	263	break;
4364b47e OF	264	}
	265	else
	266	{
04c6319a	267	if(((ps->imms.bit.i==0) && (ps->imms.bit.ms==0)) &&
910e557b	268	(n->rid < myrid) && (n->dds == ntohl(ps->ddseq)))
4364b47e OF	269	{
	270	/* I'm master! */
	271	n->options=ps->options;
910e557b	272	n->ddr=ntohl(ps->ddseq)-1;
04c6319a	273	n->imms.byte=ps->imms.byte;
abcbfd04	274	OSPF_TRACE(D_PACKETS, "I'm master to %I.", nrid);
4364b47e OF	275	ospf_neigh_sm(n, INM_NEGDONE);
	276	}
	277	else
	278	{
353f3261	279	DBG("%s: Nothing happend to %I (imms=%u)\n", p->name, n->ip,
910e557b	280	ps->imms.byte);
4364b47e OF	281	break;
	282	}
	283	}
394920a0	284	if(ps->imms.bit.i) break;
4364b47e	285	case NEIGHBOR_EXCHANGE:
04c6319a	286	if((ps->imms.byte==n->imms.byte) && (ps->options=n->options) &&
910e557b	287	(ntohl(ps->ddseq)==n->ddr))
4364b47e OF	288	{
4364b47e OF	289	/* Duplicate packet */
abcbfd04	290	OSPF_TRACE(D_PACKETS, "Received duplicate dbdes from %I.", n->ip);
04c6319a	291	if(n->imms.bit.ms==0)
4364b47e OF	292	{
	293	ospf_dbdes_tx(n);
	294	}
	295	return;
	296	}
	297
910e557b OF	298	n->ddr=ntohl(ps->ddseq);
	299
	300	if(ps->imms.bit.ms!=n->imms.bit.ms) /* M/S bit differs */
4364b47e	301	{
bd37f45c	302	DBG("SEQMIS-BIT-MS\n");
4364b47e OF	303	ospf_neigh_sm(n, INM_SEQMIS);
	304	break;
	305	}
	306
04c6319a	307	if(ps->imms.bit.i) /* I bit is set */
4364b47e	308	{
bd37f45c	309	DBG("SEQMIS-BIT-I\n");
4364b47e OF	310	ospf_neigh_sm(n, INM_SEQMIS);
	311	break;
	312	}
	313
2560c886 OF	314	n->imms.byte=ps->imms.byte;
2560c886 OF	315
4364b47e OF	316	if(ps->options!=n->options) /* Options differs */
4364b47e OF	317	{
bd37f45c	318	DBG("SEQMIS-OPT\n");
4364b47e OF	319	ospf_neigh_sm(n, INM_SEQMIS);
	320	break;
	321	}
	322
04c6319a	323	if(n->myimms.bit.ms)
4364b47e	324	{
910e557b	325	if(ntohl(ps->ddseq)!=n->dds) /* MASTER */
4364b47e	326	{
bd37f45c	327	DBG("SEQMIS-MASTER\n");
4364b47e OF	328	ospf_neigh_sm(n, INM_SEQMIS);
	329	break;
	330	}
910e557b OF	331	n->dds++;
	332	DBG("Incrementing dds\n");
	333	ospf_dbdes_reqladd(ps,p,n);
	334	if((n->myimms.bit.m==0) && (ps->imms.bit.m==0))
	335	{
	336	ospf_neigh_sm(n, INM_EXDONE);
	337	}
	338	else
	339	{
	340	ospf_dbdes_tx(n);
	341	}
	342
4364b47e OF	343	}
	344	else
	345	{
2560c886	346	if(ntohl(ps->ddseq)!=(n->dds+1)) /* SLAVE */
4364b47e	347	{
bd37f45c	348	DBG("SEQMIS-SLAVE\n");
4364b47e OF	349	ospf_neigh_sm(n, INM_SEQMIS);
	350	break;
	351	}
2560c886 OF	352	n->ddr=ntohl(ps->ddseq);
2560c886 OF	353	n->dds=ntohl(ps->ddseq);
910e557b OF	354	ospf_dbdes_reqladd(ps,p,n);
910e557b OF	355	ospf_dbdes_tx(n);
4364b47e OF	356	}
4364b47e OF	357
4364b47e OF	358	break;
	359	case NEIGHBOR_LOADING:
	360	case NEIGHBOR_FULL:
04c6319a	361	if((ps->imms.byte==n->imms.byte) && (ps->options=n->options) &&
4364b47e OF	362	(ps->ddseq==n->dds)) /* Only duplicate are accepted */
4364b47e OF	363	{
abcbfd04	364	OSPF_TRACE(D_PACKETS, "Received duplicate dbdes from %I.",n->ip);
4364b47e OF	365	return;
	366	}
	367	else
	368	{
bd37f45c	369	DBG("SEQMIS-FULL\n");
4364b47e OF	370	ospf_neigh_sm(n, INM_SEQMIS);
	371	}
	372	break;
	373	defaut:
fef1badf	374	bug("%s: Received dbdes from %I in undefined state.", p->name, n->ip);
4364b47e OF	375	break;
	376	}
	377	}
	378