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Commit 5cb04436 authored by Hannes Frederic Sowa's avatar Hannes Frederic Sowa Committed by David S. Miller
Browse files

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: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 24a372cd

include/linux/ipv6.h

+1 −0
Original line number Diff line number Diff line
@@ -47,6 +47,7 @@ struct ipv6_devconf { 
	__s32		disable_ipv6;

	__s32		accept_dad;

	__s32		force_tllao;

	__s32           ndisc_notify;

	void		*sysctl;

};

include/uapi/linux/ipv6.h

+1 −0
Original line number Diff line number Diff line
@@ -157,6 +157,7 @@ enum { 
	DEVCONF_DISABLE_IPV6,

	DEVCONF_ACCEPT_DAD,

	DEVCONF_FORCE_TLLAO,

	DEVCONF_NDISC_NOTIFY,

	DEVCONF_MAX

};

net/ipv6/addrconf.c

+8 −0
Original line number Diff line number Diff line
@@ -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 */

		}

net/ipv6/ndisc.c

+7 −0
Original line number Diff line number Diff line
@@ -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);