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Commit 8d068875 authored by Michal Kubecek's avatar Michal Kubecek Committed by Steffen Klassert
Browse files

xfrm: make gc_thresh configurable in all namespaces 



The xfrm gc threshold can be configured via xfrm{4,6}_gc_thresh
sysctl but currently only in init_net, other namespaces always
use the default value. This can substantially limit the number
of IPsec tunnels that can be effectively used.

Signed-off-by: default avatarMichal Kubecek <mkubecek@suse.cz>
Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
parent 1f53c808

include/net/netns/ipv4.h

+1 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ struct netns_ipv4 { 
	struct ctl_table_header	*frags_hdr;

	struct ctl_table_header	*ipv4_hdr;

	struct ctl_table_header *route_hdr;

	struct ctl_table_header *xfrm4_hdr;

#endif

	struct ipv4_devconf	*devconf_all;

	struct ipv4_devconf	*devconf_dflt;

include/net/netns/ipv6.h

+1 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ struct netns_sysctl_ipv6 { 
	struct ctl_table_header *route_hdr;

	struct ctl_table_header *icmp_hdr;

	struct ctl_table_header *frags_hdr;

	struct ctl_table_header *xfrm6_hdr;

#endif

	int bindv6only;

	int flush_delay;

net/ipv4/xfrm4_policy.c

+46 −3
Original line number Diff line number Diff line
@@ -262,7 +262,51 @@ static struct ctl_table xfrm4_policy_table[] = { 
	{ }

};



static struct ctl_table_header *sysctl_hdr;

static int __net_init xfrm4_net_init(struct net *net)

{

	struct ctl_table *table;

	struct ctl_table_header *hdr;



	table = xfrm4_policy_table;

	if (!net_eq(net, &init_net)) {

		table = kmemdup(table, sizeof(xfrm4_policy_table), GFP_KERNEL);

		if (!table)

			goto err_alloc;



		table[0].data = &net->xfrm.xfrm4_dst_ops.gc_thresh;

	}



	hdr = register_net_sysctl(net, "net/ipv4", table);

	if (!hdr)

		goto err_reg;



	net->ipv4.xfrm4_hdr = hdr;

	return 0;



err_reg:

	if (!net_eq(net, &init_net))

		kfree(table);

err_alloc:

	return -ENOMEM;

}



static void __net_exit xfrm4_net_exit(struct net *net)

{

	struct ctl_table *table;



	if (net->ipv4.xfrm4_hdr == NULL)

		return;



	table = net->ipv4.xfrm4_hdr->ctl_table_arg;

	unregister_net_sysctl_table(net->ipv4.xfrm4_hdr);

	if (!net_eq(net, &init_net))

		kfree(table);

}



static struct pernet_operations __net_initdata xfrm4_net_ops = {

	.init	= xfrm4_net_init,

	.exit	= xfrm4_net_exit,

};

#endif



static void __init xfrm4_policy_init(void)
@@ -277,8 +321,7 @@ void __init xfrm4_init(void) 
	xfrm4_state_init();

	xfrm4_policy_init();

#ifdef CONFIG_SYSCTL

	sysctl_hdr = register_net_sysctl(&init_net, "net/ipv4",

					 xfrm4_policy_table);

	register_pernet_subsys(&xfrm4_net_ops);

#endif

}

net/ipv6/xfrm6_policy.c

+47 −5
Original line number Diff line number Diff line
@@ -320,7 +320,51 @@ static struct ctl_table xfrm6_policy_table[] = { 
	{ }

};



static struct ctl_table_header *sysctl_hdr;

static int __net_init xfrm6_net_init(struct net *net)

{

	struct ctl_table *table;

	struct ctl_table_header *hdr;



	table = xfrm6_policy_table;

	if (!net_eq(net, &init_net)) {

		table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL);

		if (!table)

			goto err_alloc;



		table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh;

	}



	hdr = register_net_sysctl(net, "net/ipv6", table);

	if (!hdr)

		goto err_reg;



	net->ipv6.sysctl.xfrm6_hdr = hdr;

	return 0;



err_reg:

	if (!net_eq(net, &init_net))

		kfree(table);

err_alloc:

	return -ENOMEM;

}



static void __net_exit xfrm6_net_exit(struct net *net)

{

	struct ctl_table *table;



	if (net->ipv6.sysctl.xfrm6_hdr == NULL)

		return;



	table = net->ipv6.sysctl.xfrm6_hdr->ctl_table_arg;

	unregister_net_sysctl_table(net->ipv6.sysctl.xfrm6_hdr);

	if (!net_eq(net, &init_net))

		kfree(table);

}



static struct pernet_operations xfrm6_net_ops = {

	.init	= xfrm6_net_init,

	.exit	= xfrm6_net_exit,

};

#endif



int __init xfrm6_init(void)
@@ -339,8 +383,7 @@ int __init xfrm6_init(void) 
		goto out_policy;



#ifdef CONFIG_SYSCTL

	sysctl_hdr = register_net_sysctl(&init_net, "net/ipv6",

					 xfrm6_policy_table);

	register_pernet_subsys(&xfrm6_net_ops);

#endif

out:

	return ret;
@@ -352,8 +395,7 @@ out_policy: 
void xfrm6_fini(void)

{

#ifdef CONFIG_SYSCTL

	if (sysctl_hdr)

		unregister_net_sysctl_table(sysctl_hdr);

	unregister_pernet_subsys(&xfrm6_net_ops);

#endif

	xfrm6_policy_fini();

	xfrm6_state_fini();