==== //depot/projects/toehead/sys/net/route.c#1 - /home/kmacy/devel/p4/HEAD/sys/net/route.c ====
@@ -318,7 +318,7 @@
 	int flags,
 	struct sockaddr *src)
 {
-	struct rtentry *rt;
+	struct rtentry *rt, *rt0 = NULL;
 	int error = 0;
 	short *stat = NULL;
 	struct rt_addrinfo info;
@@ -362,8 +362,8 @@
 			 * Create new route, rather than smashing route to net.
 			 */
 		create:
-			if (rt)
-				rtfree(rt);
+			rt0 = rt;
+			
 			flags |=  RTF_GATEWAY | RTF_DYNAMIC;
 			bzero((caddr_t)&info, sizeof(info));
 			info.rti_info[RTAX_DST] = dst;
@@ -375,10 +375,16 @@
 			error = rtrequest1(RTM_ADD, &info, &rt);
 			if (rt != NULL) {
 				RT_LOCK(rt);
+				EVENTHANDLER_INVOKE(route_event, RTEVENT_REDIRECT_UPDATE, rt0, rt, dst);
 				flags = rt->rt_flags;
 			}
+			if (rt0)
+				RTFREE_LOCKED(rt0);
+			
 			stat = &rtstat.rts_dynamic;
 		} else {
+			struct rtentry *gwrt;
+
 			/*
 			 * Smash the current notion of the gateway to
 			 * this destination.  Should check about netmask!!!
@@ -390,6 +396,9 @@
 			 * add the key and gateway (in one malloc'd chunk).
 			 */
 			rt_setgate(rt, rt_key(rt), gateway);
+			gwrt = rtalloc1(gateway, 1, 0);
+			EVENTHANDLER_INVOKE(route_event, RTEVENT_REDIRECT_UPDATE, rt, gwrt, dst);
+			RTFREE_LOCKED(gwrt);
 		}
 	} else
 		error = EHOSTUNREACH;
==== //depot/projects/toehead/sys/net/route.h#1 - /home/kmacy/devel/p4/HEAD/sys/net/route.h ====
@@ -359,6 +359,13 @@
 	    struct sockaddr *, struct sockaddr *, int, struct rtentry **);
 int	 rtrequest1(int, struct rt_addrinfo *, struct rtentry **);
 int	 rt_check(struct rtentry **, struct rtentry **, struct sockaddr *);
+
+#include <sys/eventhandler.h>
+#define RTEVENT_ARP_UPDATE        1
+#define RTEVENT_PMTU_UPDATE       2
+#define RTEVENT_REDIRECT_UPDATE   3
+typedef void (*rtevent_fn)(void *, int, struct rtentry *, struct rtentry *, struct sockaddr *);
+EVENTHANDLER_DECLARE(route_event, rtevent_fn);
 #endif
 
 #endif
==== //depot/projects/toehead/sys/netinet/if_ether.c#1 - /home/kmacy/devel/p4/HEAD/sys/netinet/if_ether.c ====
@@ -578,7 +578,10 @@
 #ifdef DEV_CARP
 	int carp_match = 0;
 #endif
-
+	struct sockaddr_in sin;
+	sin.sin_len = sizeof(struct sockaddr_in);
+	sin.sin_family = AF_INET;
+	
 	if (ifp->if_bridge)
 		bridged = 1;
 
@@ -772,6 +775,10 @@
 	la->la_preempt = arp_maxtries;
 	hold = la->la_hold;
 	la->la_hold = NULL;
+
+	sin.sin_addr.s_addr = ntohl(itaddr.s_addr);
+	EVENTHANDLER_INVOKE(route_event, RTEVENT_ARP_UPDATE, rt, NULL,
+	    (struct sockaddr *)&sin);
 	RT_UNLOCK(rt);
 	if (hold != NULL)
 		(*ifp->if_output)(ifp, hold, rt_key(rt), rt);