Commit 7d291ebb authored by Pavel Emelyanov's avatar Pavel Emelyanov Committed by David S. Miller

inet: Register fragmentation some ctls at read-only root.

Parts of fragments-related sysctls are read-only, but this is
done by cloning all the tables and dropping write-bits from
mode. Do the same but with read-only root.
Signed-off-by: default avatarPavel Emelyanov <xemul@openvz.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0002c630
......@@ -624,6 +624,10 @@ static struct ctl_table ip4_frags_ns_ctl_table[] = {
.proc_handler = &proc_dointvec_jiffies,
.strategy = &sysctl_jiffies
},
{ }
};
static struct ctl_table ip4_frags_ctl_table[] = {
{
.ctl_name = NET_IPV4_IPFRAG_SECRET_INTERVAL,
.procname = "ipfrag_secret_interval",
......@@ -658,8 +662,6 @@ static int ip4_frags_ns_ctl_register(struct net *net)
table[0].data = &net->ipv4.frags.high_thresh;
table[1].data = &net->ipv4.frags.low_thresh;
table[2].data = &net->ipv4.frags.timeout;
table[3].mode &= ~0222;
table[4].mode &= ~0222;
}
hdr = register_net_sysctl_table(net, net_ipv4_ctl_path, table);
......@@ -684,6 +686,11 @@ static void ip4_frags_ns_ctl_unregister(struct net *net)
unregister_net_sysctl_table(net->ipv4.frags_hdr);
kfree(table);
}
static void ip4_frags_ctl_register(void)
{
register_net_sysctl_rotable(net_ipv4_ctl_path, ip4_frags_ctl_table);
}
#else
static inline int ip4_frags_ns_ctl_register(struct net *net)
{
......@@ -693,6 +700,10 @@ static inline int ip4_frags_ns_ctl_register(struct net *net)
static inline void ip4_frags_ns_ctl_unregister(struct net *net)
{
}
static inline void ip4_frags_ctl_register(void)
{
}
#endif
static int ipv4_frags_init_net(struct net *net)
......@@ -730,6 +741,7 @@ static struct pernet_operations ip4_frags_ops = {
void __init ipfrag_init(void)
{
ip4_frags_ctl_register();
register_pernet_subsys(&ip4_frags_ops);
ip4_frags.hashfn = ip4_hashfn;
ip4_frags.constructor = ip4_frag_init;
......
......@@ -658,6 +658,10 @@ static struct ctl_table ip6_frags_ns_ctl_table[] = {
.proc_handler = &proc_dointvec_jiffies,
.strategy = &sysctl_jiffies,
},
{ }
};
static struct ctl_table ip6_frags_ctl_table[] = {
{
.ctl_name = NET_IPV6_IP6FRAG_SECRET_INTERVAL,
.procname = "ip6frag_secret_interval",
......@@ -684,7 +688,6 @@ static int ip6_frags_ns_sysctl_register(struct net *net)
table[0].data = &net->ipv6.frags.high_thresh;
table[1].data = &net->ipv6.frags.low_thresh;
table[2].data = &net->ipv6.frags.timeout;
table[3].mode &= ~0222;
}
hdr = register_net_sysctl_table(net, net_ipv6_ctl_path, table);
......@@ -709,6 +712,20 @@ static void ip6_frags_ns_sysctl_unregister(struct net *net)
unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
kfree(table);
}
static struct ctl_table_header *ip6_ctl_header;
static int ip6_frags_sysctl_register(void)
{
ip6_ctl_header = register_net_sysctl_rotable(net_ipv6_ctl_path,
ip6_frags_ctl_table);
return ip6_ctl_header == NULL ? -ENOMEM : 0;
}
static void ip6_frags_sysctl_unregister(void)
{
unregister_net_sysctl_table(ip6_ctl_header);
}
#else
static inline int ip6_frags_ns_sysctl_register(struct net *net)
{
......@@ -718,6 +735,15 @@ static inline int ip6_frags_ns_sysctl_register(struct net *net)
static inline void ip6_frags_ns_sysctl_unregister(struct net *net)
{
}
static inline int ip6_frags_sysctl_register(void)
{
return 0;
}
static inline void ip6_frags_sysctl_unregister(void)
{
}
#endif
static int ipv6_frags_init_net(struct net *net)
......@@ -750,6 +776,10 @@ int __init ipv6_frag_init(void)
if (ret)
goto out;
ret = ip6_frags_sysctl_register();
if (ret)
goto err_sysctl;
ret = register_pernet_subsys(&ip6_frags_ops);
if (ret)
goto err_pernet;
......@@ -767,6 +797,8 @@ int __init ipv6_frag_init(void)
return ret;
err_pernet:
ip6_frags_sysctl_unregister();
err_sysctl:
inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
goto out;
}
......@@ -774,6 +806,7 @@ int __init ipv6_frag_init(void)
void ipv6_frag_exit(void)
{
inet_frags_fini(&ip6_frags);
ip6_frags_sysctl_unregister();
unregister_pernet_subsys(&ip6_frags_ops);
inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
}
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