IPv6: Add 'autoconf' and 'disable_ipv6' module parameters

Add 'autoconf' and 'disable_ipv6' parameters to the IPv6 module.

The first controls if IPv6 addresses are autoconfigured from
prefixes received in Router Advertisements.  The IPv6 loopback
(::1) and link-local addresses are still configured.

The second controls if IPv6 addresses are desired at all.  No
IPv6 addresses will be added to any interfaces.

Signed-off-by: Brian Haley <brian.haley@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 5 deletions

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index b6215be0963f..85b3d0036afd 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -72,9 +72,21 @@ MODULE_LICENSE("GPL");
 static struct list_head inetsw6[SOCK_MAX];
 static DEFINE_SPINLOCK(inetsw6_lock);
 
-static int disable_ipv6 = 0;
-module_param_named(disable, disable_ipv6, int, 0);
-MODULE_PARM_DESC(disable, "Disable IPv6 such that it is non-functional");
+struct ipv6_params ipv6_defaults = {
+        .disable_ipv6 = 0,
+        .autoconf = 1,
+};
+
+static int disable_ipv6_mod = 0;
+
+module_param_named(disable, disable_ipv6_mod, int, 0444);
+MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
+
+module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
+MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
+
+module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
+MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
 
 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 {
@@ -1038,7 +1050,7 @@ static int __init inet6_init(void)
         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
                 INIT_LIST_HEAD(r);
 
-        if (disable_ipv6) {
+        if (disable_ipv6_mod) {
                 printk(KERN_INFO
                        "IPv6: Loaded, but administratively disabled, "
                        "reboot required to enable\n");
@@ -1227,7 +1239,7 @@ module_init(inet6_init);
 
 static void __exit inet6_exit(void)
 {
-        if (disable_ipv6)
+        if (disable_ipv6_mod)
                 return;
 
         /* First of all disallow new sockets creation. */