[NETNS][IPV6]: Make multiple instance of sysctl tables.

Each network namespace wants its own set of sysctl value, eg. we
should not be able from a namespace to set a sysctl value for another
namespace , especially for the initial network namespace.

This patch duplicates the sysctl table when we register a new network
namespace for ipv6. The duplicated table are postfixed with the
"template" word to notify the developper the table is cloned.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 1 deletions

diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index c3bbd8687307..dfe3b37c43e9 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -907,7 +907,7 @@ int icmpv6_err_convert(int type, int code, int *err)
 EXPORT_SYMBOL(icmpv6_err_convert);
 
 #ifdef CONFIG_SYSCTL
-ctl_table ipv6_icmp_table[] = {
+ctl_table ipv6_icmp_table_template[] = {
         {
                 .ctl_name       = NET_IPV6_ICMP_RATELIMIT,
                 .procname       = "ratelimit",
@@ -918,5 +918,15 @@ ctl_table ipv6_icmp_table[] = {
         },
         { .ctl_name = 0 },
 };
+
+struct ctl_table *ipv6_icmp_sysctl_init(struct net *net)
+{
+        struct ctl_table *table;
+
+        table = kmemdup(ipv6_icmp_table_template,
+                        sizeof(ipv6_icmp_table_template),
+                        GFP_KERNEL);
+        return table;
+}
 #endif