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authorEric W. Biederman <ebiederm@xmission.com>2007-09-17 11:56:21 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 16:49:10 -0700
commit881d966b48b035ab3f3aeaae0f3d3f9b584f45b2 (patch)
treec579d59a4107cbbe9e2b85939bc0d496b815c887 /net/core/dev_mcast.c
parentb4b510290b056b86611757ce1175a230f1080f53 (diff)
downloadop-kernel-dev-881d966b48b035ab3f3aeaae0f3d3f9b584f45b2.zip
op-kernel-dev-881d966b48b035ab3f3aeaae0f3d3f9b584f45b2.tar.gz
[NET]: Make the device list and device lookups per namespace.
This patch makes most of the generic device layer network namespace safe. This patch makes dev_base_head a network namespace variable, and then it picks up a few associated variables. The functions: dev_getbyhwaddr dev_getfirsthwbytype dev_get_by_flags dev_get_by_name __dev_get_by_name dev_get_by_index __dev_get_by_index dev_ioctl dev_ethtool dev_load wireless_process_ioctl were modified to take a network namespace argument, and deal with it. vlan_ioctl_set and brioctl_set were modified so their hooks will receive a network namespace argument. So basically anthing in the core of the network stack that was affected to by the change of dev_base was modified to handle multiple network namespaces. The rest of the network stack was simply modified to explicitly use &init_net the initial network namespace. This can be fixed when those components of the network stack are modified to handle multiple network namespaces. For now the ifindex generator is left global. Fundametally ifindex numbers are per namespace, or else we will have corner case problems with migration when we get that far. At the same time there are assumptions in the network stack that the ifindex of a network device won't change. Making the ifindex number global seems a good compromise until the network stack can cope with ifindex changes when you change namespaces, and the like. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dev_mcast.c')
-rw-r--r--net/core/dev_mcast.c41
1 files changed, 37 insertions, 4 deletions
diff --git a/net/core/dev_mcast.c b/net/core/dev_mcast.c
index 8e069fc..1c4f619 100644
--- a/net/core/dev_mcast.c
+++ b/net/core/dev_mcast.c
@@ -187,11 +187,12 @@ EXPORT_SYMBOL(dev_mc_unsync);
#ifdef CONFIG_PROC_FS
static void *dev_mc_seq_start(struct seq_file *seq, loff_t *pos)
{
+ struct net *net = seq->private;
struct net_device *dev;
loff_t off = 0;
read_lock(&dev_base_lock);
- for_each_netdev(dev) {
+ for_each_netdev(net, dev) {
if (off++ == *pos)
return dev;
}
@@ -240,7 +241,22 @@ static const struct seq_operations dev_mc_seq_ops = {
static int dev_mc_seq_open(struct inode *inode, struct file *file)
{
- return seq_open(file, &dev_mc_seq_ops);
+ struct seq_file *seq;
+ int res;
+ res = seq_open(file, &dev_mc_seq_ops);
+ if (!res) {
+ seq = file->private_data;
+ seq->private = get_net(PROC_NET(inode));
+ }
+ return res;
+}
+
+static int dev_mc_seq_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq = file->private_data;
+ struct net *net = seq->private;
+ put_net(net);
+ return seq_release(inode, file);
}
static const struct file_operations dev_mc_seq_fops = {
@@ -248,14 +264,31 @@ static const struct file_operations dev_mc_seq_fops = {
.open = dev_mc_seq_open,
.read = seq_read,
.llseek = seq_lseek,
- .release = seq_release,
+ .release = dev_mc_seq_release,
};
#endif
+static int dev_mc_net_init(struct net *net)
+{
+ if (!proc_net_fops_create(net, "dev_mcast", 0, &dev_mc_seq_fops))
+ return -ENOMEM;
+ return 0;
+}
+
+static void dev_mc_net_exit(struct net *net)
+{
+ proc_net_remove(net, "dev_mcast");
+}
+
+static struct pernet_operations dev_mc_net_ops = {
+ .init = dev_mc_net_init,
+ .exit = dev_mc_net_exit,
+};
+
void __init dev_mcast_init(void)
{
- proc_net_fops_create(&init_net, "dev_mcast", 0, &dev_mc_seq_fops);
+ register_pernet_subsys(&dev_mc_net_ops);
}
EXPORT_SYMBOL(dev_mc_add);
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