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xen-devel
[Xen-devel] [RFC] Arp announce (for Xen)
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To: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Subject: |
[Xen-devel] [RFC] Arp announce (for Xen) |
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From: |
Stephen Hemminger <shemminger@xxxxxxxxxxxxxxxxxxxx> |
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Date: |
Thu, 1 Mar 2007 17:30:30 -0800 |
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Cc: |
Amsden <zach@xxxxxxxxxx>, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Jeff Garzik <jeff@xxxxxxxxxx>, Ian Pratt <ian.pratt@xxxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, Zachary, linux-kernel@xxxxxxxxxxxxxxx, Chris Wright <chrisw@xxxxxxxxxxxx>, Andi Kleen <ak@xxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Christian Limpach <Christian.Limpach@xxxxxxxxxxxx> |
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Delivery-date: |
Fri, 02 Mar 2007 01:57:46 -0800 |
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Organization: |
Linux Foundation |
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References: |
<20070301232443.195603797@xxxxxxxx> <20070301232529.648076372@xxxxxxxx> <20070301164214.4a40bc59@freekitty> <45E7764A.7000100@xxxxxxxx> |
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xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
What about implementing the unused arp_announce flag on the inetdevice?
Something like the following. Totally untested...
Looks like it either was there (and got removed) or was planned but
never implemented.
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index e10794d..cefc339 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1089,6 +1089,16 @@ static int inetdev_event(struct notifier
}
}
ip_mc_up(in_dev);
+ /* fallthru */
+
+ case NETDEV_CHANGEADDR:
+ /* Send gratuitous ARP in case of address change or new device
*/
+ if (IN_DEV_ARP_ANNOUNCE(in_dev))
+ arp_send(ARPOP_REQUEST, ETH_P_ARP,
+ in_dev->ifa_list->ifa_address, dev,
+ in_dev->ifa_list->ifa_address, NULL,
+ dev->dev_addr, NULL);
+
break;
case NETDEV_DOWN:
ip_mc_down(in_dev);
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