ospf.c and ospc.h splitted into various files.

1 files changed, 344 insertions, 0 deletions

diff --git a/proto/ospf/neighbor.c b/proto/ospf/neighbor.c
new file mode 100644
index 0000000..e4277f7
--- /dev/null
+++ b/proto/ospf/neighbor.c
@@ -0,0 +1,344 @@
+/*
+ *	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"
+
+void
+neigh_chstate(struct ospf_neighbor *n, u8 state)
+{
+  struct ospf_iface *ifa;
+  struct proto *p;
+
+  if(n->state!=state)
+  {
+    ifa=n->ifa;
+    p=(struct proto *)(ifa->proto);
+  
+    debug("%s: Neigbor '%u' changes state from %u to %u.\n", p->name, n->rid,
+      n->state, state);
+    n->state=state;
+  }
+}
+
+struct ospf_neighbor *
+electbdr(list nl)
+{
+  struct ospf_neighbor *neigh,*n1,*n2;
+
+  n1=NULL;
+  n2=NULL;
+  WALK_LIST (neigh, nl)		/* First try those decl. themselves */
+  {
+    if(neigh->state>=NEIGHBOR_2WAY)	/* Higher than 2WAY */
+      if(neigh->priority>0)		/* Eligible */
+        if(neigh->rid!=neigh->dr)	/* And not declaring itself DR */
+	{
+	  if(neigh->rid==neigh->bdr)	/* Declaring BDR */
+          {
+            if(n1!=NULL)
+            {
+              if(neigh->priority>n1->priority) n1=neigh;
+	      else if(neigh->priority==n1->priority)
+	          if(neigh->rid>n1->rid) n1=neigh;
+            }
+	    else
+            {
+              n1=neigh;
+            }
+          }
+	  else				/* And NOT declaring BDR */
+          {
+            if(n2!=NULL)
+            {
+              if(neigh->priority>n2->priority) n2=neigh;
+	      else if(neigh->priority==n2->priority)
+	          if(neigh->rid>n2->rid) n2=neigh;
+            }
+	    else
+            {
+              n2=neigh;
+            }
+          }
+      }
+  }
+  if(n1==NULL) n1=n2;
+
+  return(n1);
+}
+
+struct ospf_neighbor *
+electdr(list nl)
+{
+  struct ospf_neighbor *neigh,*n;
+
+  n=NULL;
+  WALK_LIST (neigh, nl)	/* And now DR */
+  {
+    if(neigh->state>=NEIGHBOR_2WAY)	/* Higher than 2WAY */
+      if(neigh->priority>0)		/* Eligible */
+        if(neigh->rid==neigh->dr)	/* And declaring itself DR */
+	{
+          if(n!=NULL)
+          {
+            if(neigh->priority>n->priority) n=neigh;
+	    else if(neigh->priority==n->priority)
+	        if(neigh->rid>n->rid) n=neigh;
+          }
+	  else
+          {
+            n=neigh;
+          }
+      }
+  }
+
+  return(n);
+}
+
+int
+can_do_adj(struct ospf_neighbor *n)
+{
+  struct ospf_iface *ifa;
+  struct proto *p;
+  int i;
+
+  ifa=n->ifa;
+  p=(struct proto *)(ifa->proto);
+  i=0;
+
+  switch(ifa->type)
+  {
+    case OSPF_IT_PTP:
+    case OSPF_IT_VLINK:
+      i=1;
+      break;
+    case OSPF_IT_BCAST:
+    case OSPF_IT_NBMA:
+      switch(ifa->state)
+      {
+        case OSPF_IS_DOWN:
+          die("%s: Iface %s in down state?", p->name, ifa->iface->name);
+          break;
+        case OSPF_IS_WAITING:
+          DBG("%s: Neighbor? on iface %s\n",p->name, ifa->iface->name);
+          break;
+        case OSPF_IS_DROTHER:
+          if(((n->rid==ifa->drid) || (n->rid==ifa->bdrid))
+            && (n->state==NEIGHBOR_2WAY)) i=1;
+          break;
+        case OSPF_IS_PTP:
+        case OSPF_IS_BACKUP:
+        case OSPF_IS_DR:
+          if(n->state==NEIGHBOR_2WAY) i=1;
+          break;
+        default:
+          die("%s: Iface %s in unknown state?",p->name, ifa->iface->name);
+          break;
+      }
+      break;
+    default:
+      die("%s: Iface %s is unknown type?",p->name, ifa->iface->name);
+      break;
+  }
+  DBG("%s: Iface %s can_do_adj=%d\n",p->name, ifa->iface->name,i);
+  return i;
+}
+
+/* Try to build neighbor adjacency (if does not exists) */
+void
+tryadj(struct ospf_neighbor *n, struct proto *p)
+{
+  DBG("%s: Going to build adjacency.\n", p->name);
+  neigh_chstate(n,NEIGHBOR_EXSTART);
+  if(n->adj==0)	/* First time adjacency */
+  {
+    n->dds=random_u32();
+  }
+  n->dds++;
+  n->myimms=(DBDES_MS | DBDES_M | DBDES_I );
+  tm_start(n->ifa->rxmt_timer,1);	/* Or some other number ? */
+}
+
+void
+ospf_neigh_sm(struct ospf_neighbor *n, int event)
+	/* Interface state machine */
+{
+  struct proto *p;
+
+  p=(struct proto *)(n->ifa->proto);
+
+  switch(event)
+  {
+    case INM_START:
+      neigh_chstate(n,NEIGHBOR_ATTEMPT);
+      /* FIXME No NBMA now */
+      break;
+    case INM_HELLOREC:
+      switch(n->state)
+      {
+        case NEIGHBOR_ATTEMPT:
+	case NEIGHBOR_DOWN:
+	  neigh_chstate(n,NEIGHBOR_INIT);
+	default:
+          restart_inactim(n);
+	  break;
+      }
+      break;
+    case INM_2WAYREC:
+      if(n->state==NEIGHBOR_INIT)
+      {
+        /* Can In build adjacency? */
+        neigh_chstate(n,NEIGHBOR_2WAY);
+	if(can_do_adj(n))
+        {
+          neigh_chstate(n,NEIGHBOR_EXSTART);
+          tryadj(n,p);
+        }
+      }
+      break;
+    case INM_NEGDONE:
+      if(n->state==NEIGHBOR_EXSTART)
+      {
+        neigh_chstate(n,NEIGHBOR_EXCHANGE);
+        /* FIXME Go on... */
+      }
+      break;
+    case INM_EXDONE:
+      break;
+    case INM_LOADDONE:
+      break;
+    case INM_ADJOK:
+        switch(n->state)
+        {
+          case NEIGHBOR_2WAY:
+        /* Can In build adjacency? */
+            if(can_do_adj(n))
+            {
+              neigh_chstate(n,NEIGHBOR_EXSTART);
+              tryadj(n,p);
+            }
+            break;
+          default:
+	    if(n->state>=NEIGHBOR_EXSTART)
+              if(!can_do_adj(n))
+              {
+                neigh_chstate(n,NEIGHBOR_2WAY);
+		/* FIXME Stop timers, kill database... */
+              }
+            break;
+        }
+      break;
+    case INM_SEQMIS:
+    case INM_BADLSREQ:
+      debug("%s: Bad LS req!\n", p->name);
+      if(n->state>=NEIGHBOR_EXCHANGE)
+      {
+        neigh_chstate(n,NEIGHBOR_EXSTART);
+	/* Go on....*/
+      }
+      break;
+    case INM_KILLNBR:
+    case INM_LLDOWN:
+    case INM_INACTTIM:
+      neigh_chstate(n,NEIGHBOR_DOWN);
+      break;
+    case INM_1WAYREC:
+      if(n->state>=NEIGHBOR_2WAY)
+      {
+        neigh_chstate(n,NEIGHBOR_DOWN);
+      }
+      break;
+    default:
+      die("%s: INM - Unknown event?",p->name);
+      break;
+  }
+}
+
+void
+bdr_election(struct ospf_iface *ifa, struct proto *p)
+{
+  struct ospf_neighbor *neigh,*ndr,*nbdr,me;
+  u32 myid, ndrid, nbdrid;
+  int doadj;
+
+  p=(struct proto *)(ifa->proto);
+
+  DBG("%s: (B)DR election.\n",p->name);
+
+  myid=p->cf->global->router_id;
+
+  me.state=NEIGHBOR_2WAY;
+  me.rid=myid;
+  me.priority=ifa->priority;
+  me.dr=ifa->drid;
+  me.bdr=ifa->bdrid;
+
+  add_tail(&ifa->neigh_list, NODE &me);
+
+  nbdr=electbdr(ifa->neigh_list);
+  ndr=electdr(ifa->neigh_list);
+
+  if(ndr==NULL) ndr=nbdr;
+
+  if(((ifa->drid==myid) && (ndr->rid!=myid))
+    || ((ifa->drid!=myid) && (ndr->rid==myid))
+    || ((ifa->bdrid==myid) && (nbdr->rid!=myid)) 
+    || ((ifa->bdrid!=myid) && (nbdr->rid==myid)))
+  {
+    if(ndr==NULL) ifa->drid=me.dr=0;
+    else ifa->drid=me.dr=ndr->rid;
+
+    if(nbdr==NULL) ifa->bdrid=me.bdr=0;
+    else ifa->bdrid=me.bdr=nbdr->rid;
+
+    nbdr=electbdr(ifa->neigh_list);
+    ndr=electdr(ifa->neigh_list);
+  }
+
+  if(ndr==NULL) ifa->drid=0;
+  if(ndr==NULL) ndrid=0;
+  else ndrid=ndr->rid;
+
+  if(nbdr==NULL) nbdrid=0;
+  else nbdrid=nbdr->rid;
+
+  doadj=0;
+  if((ifa->drid!=ndrid) || (ifa->bdrid!=nbdrid)) doadj=1;
+  ifa->drid=ndrid;
+  ifa->bdrid=nbdrid;
+
+  DBG("%s: DR=%u, BDR=%u\n",p->name, ifa->drid, ifa->bdrid);
+
+  if(myid==ifa->drid) iface_chstate(ifa, OSPF_IS_DR);
+  else
+  {
+    if(myid==ifa->bdrid) iface_chstate(ifa, OSPF_IS_BACKUP);
+    else iface_chstate(ifa, OSPF_IS_DROTHER);
+  }
+
+  rem_node(NODE &me);
+
+  if(doadj)
+  {
+    WALK_LIST (neigh, ifa->neigh_list)
+    {
+      ospf_neigh_sm(neigh, INM_ADJOK);
+    }
+  }
+}
+
+struct ospf_neighbor *
+find_neigh(struct ospf_iface *ifa, u32 rid)
+{
+  struct ospf_neighbor *n;
+
+  WALK_LIST (n, ifa->neigh_list)
+    if(n->rid == rid)
+      return n;
+  return NULL;
+}
+