From b325fddb7f869e6c95a88dc6573220f162e5b89f Mon Sep 17 00:00:00 2001
From: Stephen Hemminger <shemminger@vyatta.com>
Date: Thu, 26 Feb 2009 06:55:31 +0000
Subject: ipv6: Fix sysctl unregistration deadlock
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/ipv6/addrconf.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
(limited to 'net/ipv6')
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index f9afb45..40fabde 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -493,15 +493,17 @@ static void addrconf_forward_change(struct net *net, __s32 newf)
read_unlock(&dev_base_lock);
}
-static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
+static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
{
struct net *net;
net = (struct net *)table->extra2;
if (p == &net->ipv6.devconf_dflt->forwarding)
- return;
+ return 0;
+
+ if (!rtnl_trylock())
+ return -ERESTARTSYS;
- rtnl_lock();
if (p == &net->ipv6.devconf_all->forwarding) {
__s32 newf = net->ipv6.devconf_all->forwarding;
net->ipv6.devconf_dflt->forwarding = newf;
@@ -512,6 +514,7 @@ static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
if (*p)
rt6_purge_dflt_routers(net);
+ return 1;
}
#endif
@@ -3983,7 +3986,7 @@ int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
if (write)
- addrconf_fixup_forwarding(ctl, valp, val);
+ ret = addrconf_fixup_forwarding(ctl, valp, val);
return ret;
}
@@ -4019,8 +4022,7 @@ static int addrconf_sysctl_forward_strategy(ctl_table *table,
}
*valp = new;
- addrconf_fixup_forwarding(table, valp, val);
- return 1;
+ return addrconf_fixup_forwarding(table, valp, val);
}
static struct addrconf_sysctl_table
--
cgit v1.1
From 176c39af29bc4edaf37f663553eeaacd47b5bc9c Mon Sep 17 00:00:00 2001
From: Daniel Lezcano <dlezcano@fr.ibm.com>
Date: Tue, 3 Mar 2009 01:06:45 -0800
Subject: netns: fix addrconf_ifdown kernel panic
When a network namespace is destroyed the network interfaces are
all unregistered, making addrconf_ifdown called by the netdevice
notifier.
In the other hand, the addrconf exit method does a loop on the network
devices and does addrconf_ifdown on each of them. But the ordering of
the netns subsystem is not right because it uses the register_pernet_device
instead of register_pernet_subsys. If we handle the loopback as
any network device, we can safely use register_pernet_subsys.
But if we use register_pernet_subsys, the addrconf exit method will do
exactly what was already done with the unregistering of the network
devices. So in definitive, this code is pointless.
I removed the netns addrconf exit method and moved the code to the
addrconf cleanup function.
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/ipv6/addrconf.c | 39 +++++++++------------------------------
1 file changed, 9 insertions(+), 30 deletions(-)
(limited to 'net/ipv6')
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 40fabde..1220e2c 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2611,9 +2611,6 @@ static int addrconf_ifdown(struct net_device *dev, int how)
ASSERT_RTNL();
- if ((dev->flags & IFF_LOOPBACK) && how == 1)
- how = 0;
-
rt6_ifdown(net, dev);
neigh_ifdown(&nd_tbl, dev);
@@ -4448,25 +4445,6 @@ int unregister_inet6addr_notifier(struct notifier_block *nb)
EXPORT_SYMBOL(unregister_inet6addr_notifier);
-static void addrconf_net_exit(struct net *net)
-{
- struct net_device *dev;
-
- rtnl_lock();
- /* clean dev list */
- for_each_netdev(net, dev) {
- if (__in6_dev_get(dev) == NULL)
- continue;
- addrconf_ifdown(dev, 1);
- }
- addrconf_ifdown(net->loopback_dev, 2);
- rtnl_unlock();
-}
-
-static struct pernet_operations addrconf_net_ops = {
- .exit = addrconf_net_exit,
-};
-
/*
* Init / cleanup code
*/
@@ -4508,10 +4486,6 @@ int __init addrconf_init(void)
if (err)
goto errlo;
- err = register_pernet_device(&addrconf_net_ops);
- if (err)
- return err;
-
register_netdevice_notifier(&ipv6_dev_notf);
addrconf_verify(0);
@@ -4541,15 +4515,22 @@ errlo:
void addrconf_cleanup(void)
{
struct inet6_ifaddr *ifa;
+ struct net_device *dev;
int i;
unregister_netdevice_notifier(&ipv6_dev_notf);
- unregister_pernet_device(&addrconf_net_ops);
-
unregister_pernet_subsys(&addrconf_ops);
rtnl_lock();
+ /* clean dev list */
+ for_each_netdev(&init_net, dev) {
+ if (__in6_dev_get(dev) == NULL)
+ continue;
+ addrconf_ifdown(dev, 1);
+ }
+ addrconf_ifdown(init_net.loopback_dev, 2);
+
/*
* Check hash table.
*/
@@ -4570,6 +4551,4 @@ void addrconf_cleanup(void)
del_timer(&addr_chk_timer);
rtnl_unlock();
-
- unregister_pernet_subsys(&addrconf_net_ops);
}
--
cgit v1.1
From fe7ca2e1e847b65c12d245cbf402af89da96888a Mon Sep 17 00:00:00 2001
From: Brian Haley <brian.haley@hp.com>
Date: Wed, 4 Mar 2009 03:18:11 -0800
Subject: 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>
---
net/ipv6/af_inet6.c | 21 ++++++++++++++++-----
1 file changed, 16 insertions(+), 5 deletions(-)
(limited to 'net/ipv6')
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index c802bc1..da944ec 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -72,6 +72,10 @@ 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");
+
static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
{
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 list_head *r;
- int err;
+ int err = 0;
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);
if (err)
goto out;
@@ -1012,10 +1027,6 @@ static int __init inet6_init(void)
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,
* IGMP6, or NDISC control sockets.
*/
--
cgit v1.1