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IPv6: add "disable" module parameter support to ipv6.ko 

Add "disable" module parameter support to ipv6.ko by specifying
"disable=1" on module load.  We just do the minimum of initializing
inetsw6[] so calls from other modules to inet6_register_protosw()
won't OOPs, then bail out.  No IPv6 addresses or sockets can be
created as a result, and a reboot is required to enable IPv6.

Signed-off-by: Brian Haley <brian.haley@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Brian Haley 2009-03-04 03:18:11 -08:00 committed by David S. Miller
parent 4a8fd2cfda
commit fe7ca2e1e8
2 changed files with 51 additions and 5 deletions
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35
Documentation/networking/ipv6.txt Normal file
View File

@ -0,0 +1,35 @@
Options for the ipv6 module are supplied as parameters at load time.
Module options may be given as command line arguments to the insmod
or modprobe command, but are usually specified in either the
/etc/modules.conf or /etc/modprobe.conf configuration file, or in a
distro-specific configuration file.
The available ipv6 module parameters are listed below. If a parameter
is not specified the default value is used.
The parameters are as follows:
disable
Specifies whether to load the IPv6 module, but disable all
its functionality. This might be used when another module
has a dependency on the IPv6 module being loaded, but no
IPv6 addresses or operations are desired.
The possible values and their effects are:
0
IPv6 is enabled.
This is the default value.
1
IPv6 is disabled.
No IPv6 addresses will be added to interfaces, and
it will not be possible to open an IPv6 socket.
A reboot is required to enable IPv6.

21
net/ipv6/af_inet6.c
View File

@ -72,6 +72,10 @@ MODULE_LICENSE("GPL");
static struct list_head inetsw6[SOCK_MAX]; static struct list_head inetsw6[SOCK_MAX];
static DEFINE_SPINLOCK(inetsw6_lock); 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");
static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
{ {
const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
@ -991,10 +995,21 @@ static int __init inet6_init(void)
{ {
struct sk_buff *dummy_skb; struct sk_buff *dummy_skb;
struct list_head *r; struct list_head *r;
int err; int err = 0;
BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)); BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
/* Register the socket-side information for inet6_create. */
for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
INIT_LIST_HEAD(r);
if (disable_ipv6) {
printk(KERN_INFO
"IPv6: Loaded, but administratively disabled, "
"reboot required to enable\n");
goto out;
}
err = proto_register(&tcpv6_prot, 1); err = proto_register(&tcpv6_prot, 1);
if (err) if (err)
goto out; goto out;
@ -1012,10 +1027,6 @@ static int __init inet6_init(void)
goto out_unregister_udplite_proto; goto out_unregister_udplite_proto;
/* Register the socket-side information for inet6_create. */
for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
INIT_LIST_HEAD(r);
/* We MUST register RAW sockets before we create the ICMP6, /* We MUST register RAW sockets before we create the ICMP6,
* IGMP6, or NDISC control sockets. * IGMP6, or NDISC control sockets.
*/ */