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[IPV4] ARP: Alloc acceptance of unsolicited ARP via netdevice sysctl. 

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Neil Horman 2006-03-20 22:39:47 -08:00 committed by David S. Miller
parent 59f1741e54
commit abd596a4b6
4 changed files with 20 additions and 10 deletions
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1
include/linux/inetdevice.h
View File

@ -25,6 +25,7 @@ struct ipv4_devconf
int arp_filter;
int arp_announce;
int arp_ignore;
int arp_accept;
int medium_id;
int no_xfrm;
int no_policy;

1
include/linux/sysctl.h
View File

@ -456,6 +456,7 @@ enum
NET_IPV4_CONF_ARP_ANNOUNCE=18,
NET_IPV4_CONF_ARP_IGNORE=19,
NET_IPV4_CONF_PROMOTE_SECONDARIES=20,
NET_IPV4_CONF_ARP_ACCEPT=21,
__NET_IPV4_CONF_MAX
};

20
net/ipv4/arp.c
View File

@ -879,16 +879,16 @@ static int arp_process(struct sk_buff *skb)
n = __neigh_lookup(&arp_tbl, &sip, dev, 0);
#ifdef CONFIG_IP_ACCEPT_UNSOLICITED_ARP
/* Unsolicited ARP is not accepted by default.
It is possible, that this option should be enabled for some
devices (strip is candidate)
*/
if (n == NULL &&
arp->ar_op == htons(ARPOP_REPLY) &&
inet_addr_type(sip) == RTN_UNICAST)
n = __neigh_lookup(&arp_tbl, &sip, dev, -1);
#endif
if (ipv4_devconf.arp_accept) {
/* Unsolicited ARP is not accepted by default.
It is possible, that this option should be enabled for some
devices (strip is candidate)
*/
if (n == NULL &&
arp->ar_op == htons(ARPOP_REPLY) &&
inet_addr_type(sip) == RTN_UNICAST)
n = __neigh_lookup(&arp_tbl, &sip, dev, -1);
}
if (n) {
int state = NUD_REACHABLE;

8
net/ipv4/devinet.c
View File

@ -1393,6 +1393,14 @@ static struct devinet_sysctl_table {
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{
.ctl_name = NET_IPV4_CONF_ARP_ACCEPT,
.procname = "arp_accept",
.data = &ipv4_devconf.arp_accept,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{
.ctl_name = NET_IPV4_CONF_NOXFRM,
.procname = "disable_xfrm",