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Commit 607ea7cd authored by Konstantin Khlebnikov's avatar Konstantin Khlebnikov Committed by David S. Miller
Browse files

net/ipv6/addrconf: simplify sysctl registration 



Struct ctl_table_header holds pointer to sysctl table which could be used
for freeing it after unregistration. IPv4 sysctls already use that.
Remove redundant NULL assignment: ndev allocated using kzalloc.

This also saves some bytes: sysctl table could be shorter than
DEVCONF_MAX+1 if some options are disable in config.

Signed-off-by: default avatarKonstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 35c58459

include/linux/ipv6.h

+2 −1
Original line number Diff line number Diff line
@@ -63,7 +63,8 @@ struct ipv6_devconf { 
	} stable_secret;

	__s32		use_oif_addrs_only;

	__s32		keep_addr_on_down;

	void		*sysctl;



	struct ctl_table_header *sysctl_header;

};



struct ipv6_params {

net/ipv6/addrconf.c

+17 −26
Original line number Diff line number Diff line
@@ -359,7 +359,6 @@ static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 
		ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;



	ndev->cnf.mtu6 = dev->mtu;

	ndev->cnf.sysctl = NULL;

	ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);

	if (!ndev->nd_parms) {

		kfree(ndev);
@@ -5620,13 +5619,7 @@ int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 
	return ret;

}



static struct addrconf_sysctl_table

{

	struct ctl_table_header *sysctl_header;

	struct ctl_table addrconf_vars[DEVCONF_MAX+1];

} addrconf_sysctl __read_mostly = {

	.sysctl_header = NULL,

	.addrconf_vars = {

static const struct ctl_table addrconf_sysctl[] = {

		{

			.procname	= "forwarding",

			.data		= &ipv6_devconf.forwarding,
@@ -5944,52 +5937,50 @@ static struct addrconf_sysctl_table 
		{

			/* sentinel */

		}

	},

};



static int __addrconf_sysctl_register(struct net *net, char *dev_name,

		struct inet6_dev *idev, struct ipv6_devconf *p)

{

	int i;

	struct addrconf_sysctl_table *t;

	struct ctl_table *table;

	char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];



	t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);

	if (!t)

	table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);

	if (!table)

		goto out;



	for (i = 0; t->addrconf_vars[i].data; i++) {

		t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;

		t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */

		t->addrconf_vars[i].extra2 = net;

	for (i = 0; table[i].data; i++) {

		table[i].data += (char *)p - (char *)&ipv6_devconf;

		table[i].extra1 = idev; /* embedded; no ref */

		table[i].extra2 = net;

	}



	snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);



	t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);

	if (!t->sysctl_header)

	p->sysctl_header = register_net_sysctl(net, path, table);

	if (!p->sysctl_header)

		goto free;



	p->sysctl = t;

	return 0;



free:

	kfree(t);

	kfree(table);

out:

	return -ENOBUFS;

}



static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)

{

	struct addrconf_sysctl_table *t;

	struct ctl_table *table;



	if (!p->sysctl)

	if (!p->sysctl_header)

		return;



	t = p->sysctl;

	p->sysctl = NULL;

	unregister_net_sysctl_table(t->sysctl_header);

	kfree(t);

	table = p->sysctl_header->ctl_table_arg;

	unregister_net_sysctl_table(p->sysctl_header);

	p->sysctl_header = NULL;

	kfree(table);

}



static int addrconf_sysctl_register(struct inet6_dev *idev)