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linux-sg2042
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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: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Michal Kubecek 2013-02-06 10:46:33 +01:00 committed by Steffen Klassert
parent 1f53c80850
commit 8d068875ca
4 changed files with 95 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/net/netns/ipv4.h
View File

@ -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;

1
include/net/netns/ipv6.h
View File

@ -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;

49
net/ipv4/xfrm4_policy.c
View File

@ -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
}

52
net/ipv6/xfrm6_policy.c
View File

@ -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();