From 4364b47e48ddedb841e8ec8db25c8b4fa878a911 Mon Sep 17 00:00:00 2001
From: Ondrej Filip <feela@network.cz>
Date: Wed, 17 Nov 1999 15:50:41 +0000
Subject: ospf.c and ospc.h splitted into various files.

---
 proto/ospf/dbdes.c | 203 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 203 insertions(+)
 create mode 100644 proto/ospf/dbdes.c

(limited to 'proto/ospf/dbdes.c')

diff --git a/proto/ospf/dbdes.c b/proto/ospf/dbdes.c
new file mode 100644
index 0000000..85d2a3b
--- /dev/null
+++ b/proto/ospf/dbdes.c
@@ -0,0 +1,203 @@
+/*
+ *	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
+ospf_dbdes_tx(struct ospf_neighbor *n)
+{
+  struct ospf_dbdes_packet *pkt;
+  struct ospf_packet *op;
+  struct ospf_iface *ifa;
+  u16 length;
+  struct proto *p;
+
+  ifa=n->ifa;
+
+  p=(struct proto *)(ifa->proto);
+
+  switch(n->state)
+  {
+    case NEIGHBOR_EXSTART:		/* Send empty packets */
+      pkt=(struct ospf_dbdes_packet *)(ifa->ip_sk->tbuf);
+      op=(struct ospf_packet *)pkt;
+
+      fill_ospf_pkt_hdr(ifa, pkt, DBDES);
+      pkt->iface_mtu= ((struct iface *)ifa)->mtu;
+      pkt->options= ifa->options;
+      pkt->imms=n->myimms;
+      pkt->ddseq=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);
+      debug("%s: DB_DES sent for %u.\n", p->name, n->rid);
+
+    /*case NEIGHBOR_EXCHANGE:		*/
+    default:				/* Ignore it */
+      break;
+  }
+}
+
+void
+rxmt_timer_hook(timer *timer)
+{
+  struct ospf_iface *ifa;
+  struct proto *p;
+  struct ospf_neighbor *n;
+
+  ifa=(struct ospf_iface *)timer->data;
+  p=(struct proto *)(ifa->proto);
+  debug("%s: RXMT timer fired on interface %s.\n",
+    p->name, ifa->iface->name);
+  WALK_LIST (n, ifa->neigh_list)	/* Try to send db_des */
+  {
+    ospf_dbdes_tx(n);
+  }
+}
+
+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)
+  {
+    debug("%s: Received dbdes from unknown neigbor! (%u)\n", p->name,
+      nrid);
+    return ;
+  }
+
+  if(ifa->iface->mtu<size)
+  {
+    debug("%s: Received dbdes larger than MTU from (%u)!\n", p->name, nrid);
+    return ;
+  }
+
+  switch(n->state)
+  {
+    case NEIGHBOR_DOWN:
+    case NEIGHBOR_ATTEMPT:
+    case NEIGHBOR_2WAY:
+        debug("%s: Received dbdes from %u in bad state. (%u)\n", p->name, nrid);
+        return;
+      break;
+    case NEIGHBOR_INIT:
+        ospf_neigh_sm(n, INM_2WAYREC);
+	if(n->state!=NEIGHBOR_EXSTART) return;
+    case NEIGHBOR_EXSTART:
+        if(ps->imms==(DBDES_I|DBDES_M|DBDES_MS) && (n->rid > myrid) &&
+          (size == sizeof(struct ospf_dbdes_packet)))
+        {
+          /* I'm slave! */
+          n->dds=ps->ddseq;
+	  n->options=ps->options;
+	  n->myimms=(n->myimms && DBDES_M);
+	  n->ddr=ps->ddseq;
+	  n->imms=ps->imms;
+          debug("%s: I'm slave to %u. \n", p->name, nrid);
+	  ospf_neigh_sm(n, INM_NEGDONE);
+        }
+        else
+        {
+          if(((ps->imms & (DBDES_I|DBDES_MS))== 0) && (n->rid < myrid) &&
+            (n->dds == ps->ddseq))
+          {
+            /* I'm master! */
+	    n->options=ps->options;
+            n->ddr=ps->ddseq;
+            n->imms=ps->imms;
+            debug("%s: I'm master to %u. \n", p->name, nrid);
+	    ospf_neigh_sm(n, INM_NEGDONE);
+          }
+	  else
+          {
+            debug("%s: Nothing happend to %u (imms=%u)", p->name, nrid,
+              ps->imms);
+            break;
+          }
+        }
+        break;	/* I should probably continue processing packet */
+
+    case NEIGHBOR_EXCHANGE:
+	if((ps->imms==n->imms) && (ps->options=n->options) &&
+	  (ps->ddseq==n->dds))
+        {
+          /* Duplicate packet */
+          debug("%s: Received duplicate dbdes from (%u)!\n", p->name, nrid);
+	  if(!IAMMASTER(n->imms))
+	  {
+            ospf_dbdes_tx(n);
+	  }
+          return;
+        }
+
+	if(IAMMASTER(ps->imms)!=IAMMASTER(n->myimms)) /* M/S bit differs */
+        {
+          ospf_neigh_sm(n, INM_SEQMIS);
+	  break;
+        }
+
+	if(INISET(ps->imms))	/* I bit is set */
+        {
+          ospf_neigh_sm(n, INM_SEQMIS);
+	  break;
+        }
+
+	if(ps->options!=n->options)	/* Options differs */
+        {
+          ospf_neigh_sm(n, INM_SEQMIS);
+	  break;
+        }
+
+	if(IAMMASTER(n->myimms))
+        {
+          if(ps->ddseq!=n->dds)
+	  {
+	    ospf_neigh_sm(n, INM_SEQMIS);
+	    break;
+	  }
+        }
+	else
+        {
+          if(ps->ddseq!=(n->dds+1))
+	  {
+	    ospf_neigh_sm(n, INM_SEQMIS);
+	    break;
+	  }
+        }
+
+	/* FIXME: Packet accepted, go on */
+
+      break;
+    case NEIGHBOR_LOADING:
+    case NEIGHBOR_FULL:
+	if((ps->imms==n->imms) && (ps->options=n->options) &&
+	  (ps->ddseq==n->dds)) /* Only duplicate are accepted */
+        {
+          debug("%s: Received duplicate dbdes from (%u)!\n", p->name, nrid);
+          return;
+        }
+	else
+        {
+	  ospf_neigh_sm(n, INM_SEQMIS);
+        }
+      break;
+    defaut:
+      die("%s: Received dbdes from %u in unknown state. (%u)\n", p->name, nrid);
+      break;
+   }
+}
+
-- 
cgit v1.2.3