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Date:      Tue, 20 Oct 2009 17:44:51 +0000 (UTC)
From:      Qing Li <qingli@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org
Subject:   svn commit: r198298 - in stable/8/sys: . amd64/include/xen cddl/contrib/opensolaris contrib/dev/acpica contrib/pf dev/xen/xenpci netinet
Message-ID:  <200910201744.n9KHipOo073637@svn.freebsd.org>
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Author: qingli
Date: Tue Oct 20 17:44:50 2009
New Revision: 198298
URL: http://svn.freebsd.org/changeset/base/198298

Log:
  MFC	r198111
  
  This patch fixes the following issues in the ARP operation:
  
  1. There is a regression issue in the ARP code. The incomplete
     ARP entry was timing out too quickly (1 second timeout), as
     such, a new entry is created each time arpresolve() is called.
     Therefore the maximum attempts made is always 1. Consequently
     the error code returned to the application is always 0.
  2. Set the expiration of each incomplete entry to a 20-second
     lifetime.
  3. Return "incomplete" entries to the application.
  4. The return error code was incorrect.
  
  Reviewed by:	kmacy
  Approved by:	re

Modified:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)
  stable/8/sys/dev/xen/xenpci/   (props changed)
  stable/8/sys/netinet/if_ether.c
  stable/8/sys/netinet/in.c

Modified: stable/8/sys/netinet/if_ether.c
==============================================================================
--- stable/8/sys/netinet/if_ether.c	Tue Oct 20 16:46:39 2009	(r198297)
+++ stable/8/sys/netinet/if_ether.c	Tue Oct 20 17:44:50 2009	(r198298)
@@ -87,10 +87,13 @@ VNET_DEFINE(int, useloopback) = 1;	/* us
 /* timer values */
 static VNET_DEFINE(int, arpt_keep) = (20*60);	/* once resolved, good for 20
 						 * minutes */
+static VNET_DEFINE(int, arpt_down) = 20;      /* keep incomplete entries for
+					       * 20 seconds */
 static VNET_DEFINE(int, arp_maxtries) = 5;
 static VNET_DEFINE(int, arp_proxyall);
 
 #define	V_arpt_keep		VNET(arpt_keep)
+#define	V_arpt_down		VNET(arpt_down)
 #define	V_arp_maxtries		VNET(arp_maxtries)
 #define	V_arp_proxyall		VNET(arp_proxyall)
 
@@ -299,7 +302,7 @@ retry:
 	} 
 
 	if ((la->la_flags & LLE_VALID) &&
-	    ((la->la_flags & LLE_STATIC) || la->la_expire > time_uptime)) {
+	    ((la->la_flags & LLE_STATIC) || la->la_expire > time_second)) {
 		bcopy(&la->ll_addr, desten, ifp->if_addrlen);
 		/*
 		 * If entry has an expiry time and it is approaching,
@@ -307,7 +310,7 @@ retry:
 		 * arpt_down interval.
 		 */
 		if (!(la->la_flags & LLE_STATIC) &&
-		    time_uptime + la->la_preempt > la->la_expire) {
+		    time_second + la->la_preempt > la->la_expire) {
 			arprequest(ifp, NULL,
 			    &SIN(dst)->sin_addr, IF_LLADDR(ifp));
 
@@ -327,7 +330,7 @@ retry:
 		goto done;
 	}
 
-	renew = (la->la_asked == 0 || la->la_expire != time_uptime);
+	renew = (la->la_asked == 0 || la->la_expire != time_second);
 	if ((renew || m != NULL) && (flags & LLE_EXCLUSIVE) == 0) {
 		flags |= LLE_EXCLUSIVE;
 		LLE_RUNLOCK(la);
@@ -358,12 +361,12 @@ retry:
 		error = EWOULDBLOCK;	/* First request. */
 	else
 		error =
-		    (rt0->rt_flags & RTF_GATEWAY) ? EHOSTDOWN : EHOSTUNREACH;
+			(rt0->rt_flags & RTF_GATEWAY) ? EHOSTUNREACH : EHOSTDOWN;
 
 	if (renew) {
 		LLE_ADDREF(la);
-		la->la_expire = time_uptime;
-		callout_reset(&la->la_timer, hz, arptimer, la);
+		la->la_expire = time_second;
+		callout_reset(&la->la_timer, hz * V_arpt_down, arptimer, la);
 		la->la_asked++;
 		LLE_WUNLOCK(la);
 		arprequest(ifp, NULL, &SIN(dst)->sin_addr,
@@ -668,7 +671,7 @@ match:
 		la->la_flags |= LLE_VALID;
 
 		if (!(la->la_flags & LLE_STATIC)) {
-			la->la_expire = time_uptime + V_arpt_keep;
+			la->la_expire = time_second + V_arpt_keep;
 			callout_reset(&la->la_timer, hz * V_arpt_keep,
 			    arptimer, la);
 		}

Modified: stable/8/sys/netinet/in.c
==============================================================================
--- stable/8/sys/netinet/in.c	Tue Oct 20 16:46:39 2009	(r198297)
+++ stable/8/sys/netinet/in.c	Tue Oct 20 17:44:50 2009	(r198298)
@@ -1439,7 +1439,7 @@ in_lltable_dump(struct lltable *llt, str
 			struct sockaddr_dl *sdl;
 			
 			/* skip deleted entries */
-			if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
+			if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
 				continue;
 			/* Skip if jailed and not a valid IP of the prison. */
 			if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
@@ -1471,10 +1471,15 @@ in_lltable_dump(struct lltable *llt, str
 			sdl = &arpc.sdl;
 			sdl->sdl_family = AF_LINK;
 			sdl->sdl_len = sizeof(*sdl);
-			sdl->sdl_alen = ifp->if_addrlen;
 			sdl->sdl_index = ifp->if_index;
 			sdl->sdl_type = ifp->if_type;
-			bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
+			if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
+				sdl->sdl_alen = ifp->if_addrlen;
+				bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
+			} else {
+				sdl->sdl_alen = 0;
+				bzero(LLADDR(sdl), ifp->if_addrlen);
+			}
 
 			arpc.rtm.rtm_rmx.rmx_expire =
 			    lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;

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