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authorEric W. Biederman <ebiederm@xmission.com>2010-05-04 17:36:45 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2010-05-21 09:37:32 -0700
commit608b4b9548dedf4185ca47edcaae4bff2ceb62de (patch)
tree6855a119e99a4e0142c17b8cc4aa08968f3f6ab6 /net/core
parent07e98962fa778b9782c8845dfcb06a84cc050744 (diff)
downloadop-kernel-dev-608b4b9548dedf4185ca47edcaae4bff2ceb62de.zip
op-kernel-dev-608b4b9548dedf4185ca47edcaae4bff2ceb62de.tar.gz
netns: Teach network device kobjects which namespace they are in.
The problem. Network devices show up in sysfs and with the network namespace active multiple devices with the same name can show up in the same directory, ouch! To avoid that problem and allow existing applications in network namespaces to see the same interface that is currently presented in sysfs, this patch enables the tagging directory support in sysfs. By using the network namespace pointers as tags to separate out the the sysfs directory entries we ensure that we don't have conflicts in the directories and applications only see a limited set of the network devices. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/net-sysfs.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index c57c4b2..b388cda 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -14,7 +14,9 @@
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/slab.h>
+#include <linux/nsproxy.h>
#include <net/sock.h>
+#include <net/net_namespace.h>
#include <linux/rtnetlink.h>
#include <linux/wireless.h>
#include <linux/vmalloc.h>
@@ -766,6 +768,38 @@ static void rx_queue_remove_kobjects(struct net_device *net)
kset_unregister(net->queues_kset);
}
#endif /* CONFIG_RPS */
+
+static const void *net_current_ns(void)
+{
+ return current->nsproxy->net_ns;
+}
+
+static const void *net_initial_ns(void)
+{
+ return &init_net;
+}
+
+static const void *net_netlink_ns(struct sock *sk)
+{
+ return sock_net(sk);
+}
+
+static struct kobj_ns_type_operations net_ns_type_operations = {
+ .type = KOBJ_NS_TYPE_NET,
+ .current_ns = net_current_ns,
+ .netlink_ns = net_netlink_ns,
+ .initial_ns = net_initial_ns,
+};
+
+static void net_kobj_ns_exit(struct net *net)
+{
+ kobj_ns_exit(KOBJ_NS_TYPE_NET, net);
+}
+
+static struct pernet_operations sysfs_net_ops = {
+ .exit = net_kobj_ns_exit,
+};
+
#endif /* CONFIG_SYSFS */
#ifdef CONFIG_HOTPLUG
@@ -806,6 +840,13 @@ static void netdev_release(struct device *d)
kfree((char *)dev - dev->padded);
}
+static const void *net_namespace(struct device *d)
+{
+ struct net_device *dev;
+ dev = container_of(d, struct net_device, dev);
+ return dev_net(dev);
+}
+
static struct class net_class = {
.name = "net",
.dev_release = netdev_release,
@@ -815,6 +856,8 @@ static struct class net_class = {
#ifdef CONFIG_HOTPLUG
.dev_uevent = netdev_uevent,
#endif
+ .ns_type = &net_ns_type_operations,
+ .namespace = net_namespace,
};
/* Delete sysfs entries but hold kobject reference until after all
@@ -904,5 +947,9 @@ void netdev_initialize_kobject(struct net_device *net)
int netdev_kobject_init(void)
{
+ kobj_ns_type_register(&net_ns_type_operations);
+#ifdef CONFIG_SYSFS
+ register_pernet_subsys(&sysfs_net_ops);
+#endif
return class_register(&net_class);
}
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