[NETNS][FRAGS]: Duplicate sysctl tables for new namespaces.
Each namespace has to have own tables to tune their
different parameters, so duplicate the tables and
register them.
All the tables in sub-namespaces are temporarily made
read-only.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 4f01334..c51e1a1 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -661,17 +661,53 @@
static int ip4_frags_ctl_register(struct net *net)
{
+ struct ctl_table *table;
struct ctl_table_header *hdr;
- hdr = register_net_sysctl_table(net, net_ipv4_ctl_path,
- ip4_frags_ctl_table);
- return hdr == NULL ? -ENOMEM : 0;
+ table = ip4_frags_ctl_table;
+ if (net != &init_net) {
+ table = kmemdup(table, sizeof(ip4_frags_ctl_table), GFP_KERNEL);
+ if (table == NULL)
+ goto err_alloc;
+
+ table[0].mode &= ~0222;
+ table[1].mode &= ~0222;
+ table[2].mode &= ~0222;
+ table[3].mode &= ~0222;
+ table[4].mode &= ~0222;
+ }
+
+ hdr = register_net_sysctl_table(net, net_ipv4_ctl_path, table);
+ if (hdr == NULL)
+ goto err_reg;
+
+ net->ipv4.frags_hdr = hdr;
+ return 0;
+
+err_reg:
+ if (net != &init_net)
+ kfree(table);
+err_alloc:
+ return -ENOMEM;
+}
+
+static void ip4_frags_ctl_unregister(struct net *net)
+{
+ struct ctl_table *table;
+
+ table = net->ipv4.frags_hdr->ctl_table_arg;
+ unregister_net_sysctl_table(net->ipv4.frags_hdr);
+ kfree(table);
}
#else
static inline int ip4_frags_ctl_register(struct net *net)
{
return 0;
}
+
+static inline void ip4_frags_ctl_unregister(struct net *net)
+{
+}
#endif
static int ipv4_frags_init_net(struct net *net)