PERFORCE change 128316 for review

[Kip Macy]

http://perforce.freebsd.org/chv.cgi?CH=128316

Change 128316 by kmacy at kmacy:storage:toestack on 2007/10/30 01:50:45

	add eventhandlers for pmtu changes and redirects

Affected files ...

.. //depot/projects/toestack/sys/net/route.c#5 edit
.. //depot/projects/toestack/sys/net/route.h#5 edit
.. //depot/projects/toestack/sys/netinet/ip_icmp.c#4 edit

Differences ...

==== //depot/projects/toestack/sys/net/route.c#5 (text+ko) ====

@@ -496,9 +496,11 @@
 			info.rti_ifa = ifa;
 			info.rti_flags = flags;
 			rt = NULL;
+			
 			error = rtrequest1(RTM_ADD, &info, &rt);
 			if (rt != NULL) {
 				RT_LOCK(rt);
+				EVENTHANDLER_INVOKE(route_event, RTEVENT_REDIRECT_UPDATE, rt);
 				flags = rt->rt_flags;
 			}
 			stat = &rtstat.rts_dynamic;
@@ -514,6 +516,7 @@
 			 * add the key and gateway (in one malloc'd chunk).
 			 */
 			rt_setgate(rt, rt_key(rt), gateway);
+			EVENTHANDLER_INVOKE(route_event, RTEVENT_REDIRECT_UPDATE, rt);
 		}
 	} else
 		error = EHOSTUNREACH;

==== //depot/projects/toestack/sys/net/route.h#5 (text+ko) ====

@@ -367,7 +367,9 @@
 
 
 #include <sys/eventhandler.h>
-#define RTEVENT_ARP_UPDATE 1
+#define RTEVENT_ARP_UPDATE        1
+#define RTEVENT_PMTU_UPDATE       2
+#define RTEVENT_REDIRECT_UPDATE   3
 typedef void (*rtevent_fn)(void *, int, struct rtentry *);
 EVENTHANDLER_DECLARE(route_event, rtevent_fn);
 

==== //depot/projects/toestack/sys/netinet/ip_icmp.c#4 (text+ko) ====

@@ -136,6 +136,33 @@
 
 extern	struct protosw inetsw[];
 
+static void
+rt_mtu_update(struct sockaddr *icmpsrc, struct icmp *icp)
+{
+	struct rtentry *rt;
+	int mtu;
+
+	rt = rtalloc1(icmpsrc, 0, RTF_CLONING);
+	if (rt && (rt->rt_flags & RTF_HOST)) {
+		mtu = ntohs(icp->icmp_nextmtu);
+		if (!mtu)
+			mtu = ip_next_mtu(rt->rt_rmx.rmx_mtu,
+			    1);
+#ifdef DEBUG_MTUDISC	
+		printf("MTU for %s reduced to %d\n",
+		    inet_ntoa(icmpsrc.sin_addr), mtu);
+#endif		
+		if (mtu >= 296 && rt->rt_rmx.rmx_mtu > mtu) {
+			rt->rt_rmx.rmx_mtu = mtu;
+			EVENTHANDLER_INVOKE(route_event, RTEVENT_PMTU_UPDATE, rt);
+		}
+	}
+	if (rt)	
+		RTFREE(rt);
+}
+
+
+
 /*
  * Generate an error packet of type error
  * in response to bad packet ip.
@@ -442,6 +469,11 @@
 #endif
 		icmpsrc.sin_addr = icp->icmp_ip.ip_dst;
 		/*
+		 * Update the route directly for use by protocol offload
+		 */
+		if (code == PRC_MSGSIZE)
+			rt_mtu_update((struct sockaddr *)&icmpsrc, icp);
+		/*
 		 * XXX if the packet contains [IPv4 AH TCP], we can't make a
 		 * notification to TCP layer.
 		 */