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net: add ARP notify option for devices

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This adds another inet device option to enable gratuitous ARP
when device is brought up or address change. This is handy for
clusters or virtualization.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2009-02-01 01:04:33 -08:00 committed by David S. Miller
parent ead731837d
commit eefef1cf76
5 changed files with 18 additions and 0 deletions
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6
Documentation/networking/ip-sysctl.txt
View file

@ -782,6 +782,12 @@ arp_ignore - INTEGER
The max value from conf/{all,interface}/arp_ignore is used
when ARP request is received on the {interface}
arp_notify - BOOLEAN
Define mode for notification of address and device changes.
0 - (default): do nothing
1 - Generate gratuitous arp replies when device is brought up
or hardware address changes.
arp_accept - BOOLEAN
Define behavior when gratuitous arp replies are received:
0 - drop gratuitous arp frames

1
include/linux/inetdevice.h
View file

@ -108,6 +108,7 @@ static inline void ipv4_devconf_setall(struct in_device *in_dev)
#define IN_DEV_ARPFILTER(in_dev) IN_DEV_ORCONF((in_dev), ARPFILTER)
#define IN_DEV_ARP_ANNOUNCE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
#define IN_DEV_ARP_IGNORE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
#define IN_DEV_ARP_NOTIFY(in_dev) IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
struct in_ifaddr
{

1
include/linux/sysctl.h
View file

@ -490,6 +490,7 @@ enum
NET_IPV4_CONF_ARP_IGNORE=19,
NET_IPV4_CONF_PROMOTE_SECONDARIES=20,
NET_IPV4_CONF_ARP_ACCEPT=21,
NET_IPV4_CONF_ARP_NOTIFY=22,
__NET_IPV4_CONF_MAX
};

1
kernel/sysctl_check.c
View file

@ -219,6 +219,7 @@ static const struct trans_ctl_table trans_net_ipv4_conf_vars_table[] = {
{ NET_IPV4_CONF_ARP_IGNORE, "arp_ignore" },
{ NET_IPV4_CONF_PROMOTE_SECONDARIES, "promote_secondaries" },
{ NET_IPV4_CONF_ARP_ACCEPT, "arp_accept" },
{ NET_IPV4_CONF_ARP_NOTIFY, "arp_notify" },
{}
};

9
net/ipv4/devinet.c
View file

@ -1075,6 +1075,14 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
}
}
ip_mc_up(in_dev);
/* fall through */
case NETDEV_CHANGEADDR:
if (IN_DEV_ARP_NOTIFY(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);
@ -1439,6 +1447,7 @@ static struct devinet_sysctl_table {
DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),