From 296ecb56eb4d1951d23d74d502d2c48a42eb6eee Mon Sep 17 00:00:00 2001
From: Ondrej Filip <feela@network.cz>
Date: Tue, 11 May 1999 15:34:33 +0000
Subject: [PATCH] OSPF RX implementation starts....

---
 proto/ospf/ospf.c | 101 +++++++++++++++++++++++++++++++++++++++++++++-
 proto/ospf/ospf.h |  28 +++++++++++++
 2 files changed, 128 insertions(+), 1 deletion(-)

diff --git a/proto/ospf/ospf.c b/proto/ospf/ospf.c
index f2f250ca..2db672b4 100644
--- a/proto/ospf/ospf.c
+++ b/proto/ospf/ospf.c
@@ -22,11 +22,37 @@
 
 #include "ospf.h"
 
+void
+ospf_hello_rx(struct ospf_hello_packet *ps, struct proto *p,
+  struct ospf_iface *ifa)
+{
+  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(p->name);
+      DBG(": Neighbour? on iface ");
+      DBG(ifa->iface->name);
+      DBG("\n");
+      break;
+    default:
+      die("%s: Iface %s in unknown state?",p->name, ifa->iface->name);
+      break;
+  }
+}
+
 int
 ospf_rx_hook(sock *sk, int size)
 {
+#ifndef IPV6
+  struct ospf_packet *ps;
   struct ospf_iface *ifa;
   struct proto *p;
+  int i;
+  u8 *pu8;
+
 
   ifa=(struct ospf_iface *)(sk->data);
 
@@ -35,6 +61,71 @@ ospf_rx_hook(sock *sk, int size)
   DBG(": RX_Hook called on interface ");
   DBG(sk->iface->name);
   DBG(".\n");
+
+  ps=(struct ospf_packet *)(sk->rbuf+5*4);
+
+  if(size<=(20+sizeof(struct ospf_packet)))
+  {
+    log("%s: Bad packet received: too short", p->name);
+    log("%s: Discarding",p->name);
+    return(1);
+  }
+
+  if((ntohs(ps->length))!=(size-20))
+  {
+    log("%s: Bad packet received: size fields does not match", p->name);
+    log("%s: Discarding",p->name);
+    return(1);
+  }
+
+  if(ps->version!=OSPF_VERSION)
+  {
+    log("%s: Bad packet received: version %d", p->name, ps->version);
+    log("%s: Discarding",p->name);
+    return(1);
+  }
+
+  /* FIXME: Count checksum */
+  /* FIXME: Do authetification */
+
+  if(ps->areaid!=ifa->area)
+  {
+    log("%s: Bad packet received: other area %ld", p->name, ps->areaid);
+    log("%s: Discarding",p->name);
+    return(1);
+  }
+
+  /* Dump packet */
+  pu8=(u8 *)(sk->rbuf+5*4);
+  for(i=0;i<ntohs(ps->length);i+=4)
+    debug("%s: received %d,%d,%d,%d\n",p->name, pu8[i+0], pu8[i+1], pu8[i+2],
+		    pu8[i+3]);
+  debug("%s: received size: %d\n",p->name,size);
+
+  switch(ps->type)
+  {
+    case HELLO:
+      DBG(p->name);
+      DBG(": Hello received.\n");
+      ospf_hello_rx((struct ospf_hello_packet *)ps, p, ifa);
+      break;
+    case DBDES:
+      break;
+    case LSREQ:
+      break;
+    case LSUPD:
+      break;
+    case LSACK:
+      break;
+    default:
+      log("%s: Bad packet received: wrong type %d", p->name, ps->type);
+      log("%s: Discarding",p->name);
+      return(1);
+  };
+  DBG("\n");
+#else
+#error RX_Hook does not work for IPv6 now.
+#endif
   return(1);
 }
 
@@ -164,6 +255,7 @@ add_hello_timer(struct ospf_iface *ifa)
   ifa->timer->expires=0;
   tm_start(ifa->timer,0);
   DBG("%s: Installing hello timer.\n", p->name);
+  if(ifa->type=OSPF_IT_PTP) ifa->state=OSPF_IS_PTP;
 }
 
 void
@@ -197,6 +289,10 @@ wait_timer_hook(timer *timer)
     }
     add_hello_timer(ifa);
   }
+  else
+  {
+    die("%s: Wait timer fired I'm not in WAITING state?", p->name);
+  }
 }
 
 void
@@ -213,6 +309,7 @@ add_wait_timer(struct ospf_iface *ifa, pool *pool, int wait)
     ifa->timer->hook=wait_timer_hook;
     ifa->timer->recurrent=0;
     ifa->timer->expires=0;
+    ifa->state=OSPF_IS_WAITING;
     tm_start(ifa->timer,(wait!=0 ? wait : WAIT_D));
     DBG(p->name);
     DBG(": Installing wait timer.\n");
@@ -228,7 +325,7 @@ ospf_iface_default(struct ospf_iface *ifa)
 {
   int i;
 
-  ifa->area=0;
+  ifa->area=0; /* FIXME: Read from config */
   ifa->cost=COST_D;
   ifa->rxmtint=RXMTINT_D;
   ifa->iftransdelay=IFTRANSDELAY_D;
@@ -295,6 +392,7 @@ ospf_if_notify(struct proto *p, unsigned flags, struct iface *iface)
     if((ifa=find_iface((struct proto_ospf *)p, iface))!=NULL)
     {
       debug(" OSPF: killing interface %s.\n", iface->name);
+      /* FIXME: This should delete ifaces */
     }
   }
 
@@ -303,6 +401,7 @@ ospf_if_notify(struct proto *p, unsigned flags, struct iface *iface)
     if((ifa=find_iface((struct proto_ospf *)p, iface))!=NULL)
     {
       debug(" OSPF: changing MTU on interface %s.\n", iface->name);
+      /* FIXME: change MTU */
     }
   }
 }
diff --git a/proto/ospf/ospf.h b/proto/ospf/ospf.h
index ac20e9b0..eb49ca54 100644
--- a/proto/ospf/ospf.h
+++ b/proto/ospf/ospf.h
@@ -11,6 +11,7 @@
 
 #define OSPF_PROTO 89
 #ifndef IPV6
+#define OSPF_VERSION 2
 #define AllSPFRouters ipa_from_u32(0xe0000005)	/* 224.0.0.5 */
 #define AllDRouters ipa_from_u32(0xe0000006)	/* 224.0.0.6 */
 #else
@@ -84,4 +85,31 @@ struct ospf_patt {
   byte mode;
 };
 
+struct ospf_packet {
+  u8 version;
+  u8 type;
+#define HELLO 1 /* Hello */
+#define DBDES 2 /* Database description */
+#define LSREQ 3 /* Link state request */
+#define LSUPD 4 /* Link state update */
+#define LSACK 5 /* Link state acknowledgement */
+  u16 length;
+  u32 routerid;
+  u32 areaid;
+  u16 checksum;
+  u16 autype;
+  u8 authetication[8];
+};
+
+struct ospf_hello_packet {
+  struct ospf_packet;
+  u32 netmask;
+  u16 hello_int;
+  u8 options;
+  u8 priority;
+  u32 deadint;
+  u32 dr;
+  u32 bdr;
+};
+
 #endif /* _BIRD_OSPF_H_ */