Fixes a bug in LSA update of large LSAs.

5 files changed, 79 insertions, 60 deletions

diff --git a/proto/ospf/hello.c b/proto/ospf/hello.c
index 70fb654..3d7d8de 100644
--- a/proto/ospf/hello.c
+++ b/proto/ospf/hello.c
@@ -297,7 +297,7 @@ ospf_hello_send(timer *timer, int poll, struct ospf_neighbor *dirn)
   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))
+    if ((i+1) * sizeof(u32) + sizeof(struct ospf_hello_packet) > ospf_pkt_bufsize(ifa))
     {
       OSPF_TRACE(D_PACKETS, "Too many neighbors on the interface!");
       break;
diff --git a/proto/ospf/lsupd.c b/proto/ospf/lsupd.c
index 62e7eac..fb757d0 100644
--- a/proto/ospf/lsupd.c
+++ b/proto/ospf/lsupd.c
@@ -330,67 +330,74 @@ ospf_lsupd_flood(struct proto_ospf *po,
 void				/* I send all I received in LSREQ */
 ospf_lsupd_send_list(struct ospf_neighbor *n, list * l)
 {
-  struct l_lsr_head *llsh;
-  u16 len;
-  u32 lsano;
-  struct top_hash_entry *en;
-  struct ospf_lsupd_packet *pk;
-  struct ospf_packet *op;
   struct ospf_area *oa = n->ifa->oa;
-  struct proto_ospf *po = oa->po;
-  struct proto *p = &po->proto;
-  void *pktpos;
-
-  if (EMPTY_LIST(*l))
-    return;
-
-  DBG("LSupd: 1st packet\n");
-
-  pk= ospf_tx_buffer(n->ifa);
-  op = &pk->ospf_packet;
+  struct proto *p = &oa->po->proto;
+  struct l_lsr_head *lsr;
+  struct top_hash_entry *en;
+  struct ospf_lsupd_packet *pkt;
+  u32 len, len2, lsano;
+  char *buf;
 
-  ospf_pkt_fill_hdr(n->ifa, pk, LSUPD_P);
-  len = sizeof(struct ospf_lsupd_packet);
-  lsano = 0;
-  pktpos = (pk + 1);
+  pkt = ospf_tx_buffer(n->ifa);
+  buf = (void *) pkt;
 
-  WALK_LIST(llsh, *l)
+  lsr = HEAD(*l);
+  while(NODE_NEXT(lsr))
   {
-    u32 domain = ospf_lsa_domain(llsh->lsh.type, n->ifa);
-    if ((en = ospf_hash_find(po->gr, domain, llsh->lsh.id,
-			       llsh->lsh.rt, llsh->lsh.type)) == NULL)
-      continue;			/* Probably flushed LSA */
-    /* FIXME This is a bug! I cannot flush LSA that is in lsrt */
-
-    DBG("Sending LSA: Type=%u, ID=%R, RT=%R, SN: 0x%x, Age: %u\n",
-	llsh->lsh.type, llsh->lsh.id, llsh->lsh.rt, en->lsa.sn, en->lsa.age);
-    if (((u32) (len + en->lsa.length)) > ospf_pkt_maxsize(n->ifa))
+    /* Prepare the packet */
+    ospf_pkt_fill_hdr(n->ifa, pkt, LSUPD_P);
+    len = sizeof(struct ospf_lsupd_packet);
+    lsano = 0;
+
+    /* Fill the packet with LSAs */
+    while(NODE_NEXT(lsr))
     {
-      pk->lsano = htonl(lsano);
-      op->length = htons(len);
+      u32 domain = ospf_lsa_domain(lsr->lsh.type, n->ifa);
+      en = ospf_hash_find(oa->po->gr, domain, lsr->lsh.id, lsr->lsh.rt, lsr->lsh.type);
+      if (en == NULL)
+      {
+	/* Probably flushed LSA, this should not happen */
+	log(L_WARN "OSPF: LSA disappeared (Type: %04x, Id: %R, Rt: %R)", 
+	    lsr->lsh.type, lsr->lsh.id, lsr->lsh.rt);
+	lsr = NODE_NEXT(lsr);
+	continue;			
+      }
 
-      OSPF_PACKET(ospf_dump_lsupd, pk, "LSUPD packet sent to %I via %s", n->ip, n->ifa->iface->name);
-      ospf_send_to(n->ifa, n->ip);
+      len2 = len + en->lsa.length;
+      if (len2 > ospf_pkt_maxsize(n->ifa))
+      {
+	/* The packet if full, stop adding LSAs and sent it */
+	if (lsano > 0)
+	  break;
+
+	/* LSA is larger than MTU, check buffer size */
+	if (len2 > ospf_pkt_bufsize(n->ifa))
+	{
+	  /* Cannot fit in a tx buffer, skip that */
+	  log(L_WARN "OSPF: LSA too large to send (Type: %04x, Id: %R, Rt: %R)", 
+	      lsr->lsh.type, lsr->lsh.id, lsr->lsh.rt);
+	  lsr = NODE_NEXT(lsr);
+	  continue;
+	}
+      }
 
-      DBG("LSupd: next packet\n");
-      ospf_pkt_fill_hdr(n->ifa, pk, LSUPD_P);
-      len = sizeof(struct ospf_lsupd_packet);
-      lsano = 0;
-      pktpos = (pk + 1);
+      /* Copy the LSA to the packet */
+      htonlsah(&(en->lsa), (struct ospf_lsa_header *) (buf + len));
+      htonlsab(en->lsa_body, buf + len + sizeof(struct ospf_lsa_header),
+	       en->lsa.length - sizeof(struct ospf_lsa_header));
+      len = len2;
+      lsano++;
+      lsr = NODE_NEXT(lsr);
     }
-    htonlsah(&(en->lsa), pktpos);
-    pktpos = pktpos + sizeof(struct ospf_lsa_header);
-    htonlsab(en->lsa_body, pktpos, en->lsa.length - sizeof(struct ospf_lsa_header));
-    pktpos = pktpos + en->lsa.length - sizeof(struct ospf_lsa_header);
-    len += en->lsa.length;
-    lsano++;
-  }
-  if (lsano > 0)
-  {
-    pk->lsano = htonl(lsano);
-    op->length = htons(len);
 
-    OSPF_PACKET(ospf_dump_lsupd, pk, "LSUPD packet sent to %I via %s", n->ip, n->ifa->iface->name);
+    if (lsano == 0)
+      break;
+
+    /* Send the packet */
+    pkt->lsano = htonl(lsano);
+    pkt->ospf_packet.length = htons(len);
+    OSPF_PACKET(ospf_dump_lsupd, pkt, "LSUPD packet sent to %I via %s",
+		n->ip, n->ifa->iface->name);
     ospf_send_to(n->ifa, n->ip);
   }
 }
diff --git a/proto/ospf/ospf.h b/proto/ospf/ospf.h
index 103ca55..1ae83c1 100644
--- a/proto/ospf/ospf.h
+++ b/proto/ospf/ospf.h
@@ -10,7 +10,6 @@
 #define _BIRD_OSPF_H_
 
 #define MAXNETS 10
-#define OSPF_VLINK_MTU 576	/* RFC2328 - A.1 */
 #define OSPF_MAX_PKT_SIZE 65536
 			/*
                          * RFC 2328 says, maximum packet size is 65535
@@ -53,11 +52,13 @@ do { if ((p->debug & D_PACKETS) || OSPF_FORCE_DEBUG) \
 #ifndef IPV6
 #define OSPFv2 1
 #define OSPF_VERSION 2
+#define OSPF_VLINK_MTU 576			/* RFC 2328 A.1 */
 #define AllSPFRouters ipa_from_u32(0xe0000005)	/* 224.0.0.5 */
 #define AllDRouters ipa_from_u32(0xe0000006)	/* 224.0.0.6 */
 #else
 #define OSPFv3 1
 #define OSPF_VERSION 3
+#define OSPF_VLINK_MTU 1280			/* RFC 5340 A.1 */
 #define AllSPFRouters _MI(0xFF020000, 0, 0, 5)	/* FF02::5 */
 #define AllDRouters   _MI(0xFF020000, 0, 0, 6)	/* FF02::6 */
 #endif
diff --git a/proto/ospf/packet.c b/proto/ospf/packet.c
index 6ae29a8..bfc17d7 100644
--- a/proto/ospf/packet.c
+++ b/proto/ospf/packet.c
@@ -39,19 +39,17 @@ ospf_pkt_fill_hdr(struct ospf_iface *ifa, void *buf, u8 h_type)
 unsigned
 ospf_pkt_maxsize(struct ospf_iface *ifa)
 {
-  /* For virtual links use mtu=576, can be mtu < 576? */
   unsigned mtu = (ifa->type == OSPF_IT_VLINK) ? OSPF_VLINK_MTU : ifa->iface->mtu;
-  unsigned add = 0;
+  unsigned headers = SIZE_OF_IP_HEADER;
 
 #ifdef OSPFv2
-  add = ((ifa->autype == OSPF_AUTH_CRYPT) ? OSPF_AUTH_CRYPT_SIZE : 0);
+  if (ifa->autype == OSPF_AUTH_CRYPT)
+    headers += OSPF_AUTH_CRYPT_SIZE;
 #endif
 
-  return ((mtu <=  ifa->iface->mtu) ? mtu : ifa->iface->mtu) -
-  SIZE_OF_IP_HEADER - add;
+  return mtu - headers;
 }
 
-
 #ifdef OSPFv2
 
 static void
diff --git a/proto/ospf/packet.h b/proto/ospf/packet.h
index 1c74a70..c0185b9 100644
--- a/proto/ospf/packet.h
+++ b/proto/ospf/packet.h
@@ -21,4 +21,17 @@ void ospf_send_to(struct ospf_iface *ifa, ip_addr ip);
 
 static inline void * ospf_tx_buffer(struct ospf_iface *ifa) { return ifa->sk->tbuf; }
 
+static inline unsigned
+ospf_pkt_bufsize(struct ospf_iface *ifa)
+{
+#ifdef OSPFv2
+  unsigned headers = (ifa->autype == OSPF_AUTH_CRYPT) ? OSPF_AUTH_CRYPT_SIZE : 0;
+#else
+  unsigned headers = 0;
+#endif
+
+  return ifa->sk->tbsize - headers;
+}
+
+
 #endif /* _BIRD_OSPF_PACKET_H_ */