3 files changed, 16 insertions, 6 deletions
diff --git a/proto/rip/auth.c b/proto/rip/auth.c
index 17c8d3a6..5337268c 100644
--- a/proto/rip/auth.c
+++ b/proto/rip/auth.c
@@ -31,7 +31,7 @@
 
 /* 1 == failed, 0 == ok */
 int
-rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, struct rip_packet *packet, int num )
+rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, struct rip_packet *packet, int num, ip_addr whotoldme )
 {
   DBG( "Incoming authentication: " );
   switch (block->authtype) {	/* Authentication type */
@@ -73,6 +73,18 @@ rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, stru
 	DBG( "time, " );
 	if ((head->from > now) || (head->to < now))
 	  goto skip;
+	if (block->seq) {
+	  struct neighbor *neigh = neigh_find(p, &whotoldme, 0);
+	  if (!neigh) {
+	    log( L_AUTH "Non-neighbour md5 checksummed packet?\n" );
+	  } else {
+	    if (neigh->aux > block->seq) {
+	      log( L_AUTH "md5 prottected packet with lower numbers\n" );
+	      return 0;
+	    }
+	    neigh->aux = block->seq;
+	  }
+	}
 	DBG( "check, " );
 	if (head->id == block->keyid) {
 	  struct MD5Context ctxt;
diff --git a/proto/rip/rip.c b/proto/rip/rip.c
index cca329ec..63401337 100644
--- a/proto/rip/rip.c
+++ b/proto/rip/rip.c
@@ -9,7 +9,7 @@
  	FIXME: IpV6 support: use right address for broadcasts
 	FIXME: IpV6 support: receive "route using" blocks
 
-	FIXME: fold rip_connection into rip_interface?
+	FIXME (nonurgent): fold rip_connection into rip_interface?
 
 	We are not going to honour requests for sending part of
 	routing table. That would need to turn split horizont off,
@@ -353,7 +353,7 @@ rip_process_packet( struct proto *p, struct rip_packet *packet, int num, ip_addr
 	    if (block->family == 0xffff) {
 	      if (i)
 		continue;	/* md5 tail has this family */
-	      if (rip_incoming_authentication(p, (void *) block, packet, num))
+	      if (rip_incoming_authentication(p, (void *) block, packet, num, whotoldme))
 		BAD( "Authentication failed" );
 	      authenticated = 1;
 	      continue;
@@ -437,8 +437,6 @@ rip_timer(timer *t)
     }
   }
 
-  /* FIXME: we need to do triggered updates */
-
   DBG( "RIP: Broadcasting routing tables\n" );
   {
     struct rip_interface *rif;
diff --git a/proto/rip/rip.h b/proto/rip/rip.h
index fb066b5d..8e759c45 100644
--- a/proto/rip/rip.h
+++ b/proto/rip/rip.h
@@ -157,5 +157,5 @@ void rip_init_config(struct rip_proto_config *c);
 
 /* Authentication functions */
 
-int rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, struct rip_packet *packet, int num );
+int rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, struct rip_packet *packet, int num, ip_addr whotoldme );
 int rip_outgoing_authentication( struct proto *p, struct rip_block_auth *block, struct rip_packet *packet, int num );