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ipv6: add knob to send unsolicited ND on link-layer address change 

This patch introduces a new knob ndisc_notify. If enabled, the kernel
will transmit an unsolicited neighbour advertisement on link-layer address
change to update the neighbour tables of the corresponding hosts more quickly.

This is the equivalent to arp_notify in ipv4 world.

Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hannes Frederic Sowa 2012-11-06 16:46:20 +00:00 committed by David S. Miller
parent 24a372cd0b
commit 5cb04436ee
4 changed files with 17 additions and 0 deletions
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1
include/linux/ipv6.h
View File

@ -47,6 +47,7 @@ struct ipv6_devconf {
__s32 disable_ipv6;
__s32 accept_dad;
__s32 force_tllao;
__s32 ndisc_notify;
void *sysctl;
};

1
include/uapi/linux/ipv6.h
View File

@ -157,6 +157,7 @@ enum {
DEVCONF_DISABLE_IPV6,
DEVCONF_ACCEPT_DAD,
DEVCONF_FORCE_TLLAO,
DEVCONF_NDISC_NOTIFY,
DEVCONF_MAX
};

8
net/ipv6/addrconf.c
View File

@ -4037,6 +4037,7 @@ static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
}
static inline size_t inet6_ifla6_size(void)
@ -4704,6 +4705,13 @@ static struct addrconf_sysctl_table
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "ndisc_notify",
.data = &ipv6_devconf.ndisc_notify,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
/* sentinel */
}

7
net/ipv6/ndisc.c
View File

@ -1572,11 +1572,18 @@ static int ndisc_netdev_event(struct notifier_block *this, unsigned long event,
{
struct net_device *dev = ptr;
struct net *net = dev_net(dev);
struct inet6_dev *idev;
switch (event) {
case NETDEV_CHANGEADDR:
neigh_changeaddr(&nd_tbl, dev);
fib6_run_gc(~0UL, net);
idev = in6_dev_get(dev);
if (!idev)
break;
if (idev->cnf.ndisc_notify)
ndisc_send_unsol_na(dev);
in6_dev_put(idev);
break;
case NETDEV_DOWN:
neigh_ifdown(&nd_tbl, dev);