From ac2527611ae57dd54edb2d08e26a2b54aeca9dc4 Mon Sep 17 00:00:00 2001
From: Stephen Hemminger <stephen.hemminger@vyatta.com>
Date: Wed, 2 Apr 2008 16:04:40 -0700
Subject: stop watchlink when address is removed

Kludge to work around address watchlink interaction: remove status file.
This should fix bug 2802.

There may still be problems when multiple addresses are assigned to
an interface. The correct fix is to just get rid of the watchlink
process and do the management in kernel or zebra.
---
 scripts/vyatta-interfaces.pl | 41 +++++++++++++++++++----------------------
 1 file changed, 19 insertions(+), 22 deletions(-)

diff --git a/scripts/vyatta-interfaces.pl b/scripts/vyatta-interfaces.pl
index c60288a..01ddd5e 100755
--- a/scripts/vyatta-interfaces.pl
+++ b/scripts/vyatta-interfaces.pl
@@ -325,6 +325,18 @@ sub update_eth_addrs {
     exit 1;
 }
 
+sub if_nametoindex {
+    my ($intf) = @_;
+
+    open my $sysfs, "<", "/sys/class/net/$intf/ifindex" 
+	|| die "Unknown interface $intf";
+    my $ifindex = <$sysfs>;
+    close($sysfs) or die "read sysfs error\n";
+    chomp $ifindex;
+    print "$intf = $ifindex\n";
+    return $ifindex;
+}
+
 sub delete_eth_addrs {
     my ($addr, $intf) = @_;
 
@@ -336,8 +348,9 @@ sub delete_eth_addrs {
     } 
     my $version = is_ip_v4_or_v6($addr);
 
-    # If interface has address than delete it
     if (is_ip_configured($intf, $addr)) {
+	# Link is up, so just delete address
+	# Zebra is watching for netlink events and will handle it
 	if ($version == 4) {
 	    exec 'ip', 'addr', 'del', $addr, 'dev', $intf;
 	} elsif ($version == 6) {
@@ -348,28 +361,12 @@ sub delete_eth_addrs {
 	die "Can't exec ip";
     }
 
-    # Interface address might have been removed by quagga link going down
-    # so tell quagga no to restore it on link-detect
-    my $vtysh;
-    if ( -x '/usr/bin/vyatta-vtysh' ) {
-	$vtysh = '/usr/bin/vyatta-vtysh';
-    } else {
-	$vtysh = '/usr/bin/vtysh';
-    }
+    # Destroy watchlink's internal status so it doesn't erronously
+    # restore the address when link is restored
+    my $status = '/var/linkstatus/' . if_nametoindex($intf);
+    unlink($status) or die "can't remove $status";
 
-    my @cmd = ();
-    if ($version == 4) {
-	@cmd = ('vtysh', '-c', 
-		"configure terminal; interface $intf; no ip address $intf" );
-    } elsif ($version == 6) {
-	@cmd = ('vtysh', '-c', 
-		"configure terminal; interface $intf; no ip6 address $intf" );
-    } else {
-	die "Bad ip version";
-    }
-    exec $vtysh, @cmd;
-
-    die "Can't exec vtysh";
+    exit 0;
 }
 
 sub update_mac {
-- 
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