path: root/net/atm
diff options
authorEric W. Biederman <ebiederm@xmission.com>2008-01-24 00:13:18 -0800
committerDavid S. Miller <davem@davemloft.net>2008-01-28 15:00:03 -0800
commit426b5303eb435d98b9bee37a807be386bc2b3320 (patch)
tree86f7bd945101d9ac51afb22a210d22b8ff956a4e /net/atm
parente1af9f270b69a3ad1dcbabb404dd1f40a96f43f5 (diff)
[NETNS]: Modify the neighbour table code so it handles multiple network namespaces
I'm actually surprised at how much was involved. At first glance it appears that the neighbour table data structures are already split by network device so all that should be needed is to modify the user interface commands to filter the set of neighbours by the network namespace of their devices. However a couple things turned up while I was reading through the code. The proxy neighbour table allows entries with no network device, and the neighbour parms are per network device (except for the defaults) so they now need a per network namespace default. So I updated the two structures (which surprised me) with their very own network namespace parameter. Updated the relevant lookup and destroy routines with a network namespace parameter and modified the code that interacts with users to filter out neighbour table entries for devices of other namespaces. I'm a little concerned that we can modify and display the global table configuration and from all network namespaces. But this appears good enough for now. I keep thinking modifying the neighbour table to have per network namespace instances of each table type would should be cleaner. The hash table is already dynamically sized so there are it is not a limiter. The default parameter would be straight forward to take care of. However when I look at the how the network table is built and used I still find some assumptions that there is only a single neighbour table for each type of table in the kernel. The netlink operations, neigh_seq_start, the non-core network users that call neigh_lookup. So while it might be doable it would require more refactoring than my current approach of just doing a little extra filtering in the code. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/atm')
1 files changed, 14 insertions, 1 deletions
diff --git a/net/atm/clip.c b/net/atm/clip.c
index 741742f0079..47fbdc0c5f7 100644
--- a/net/atm/clip.c
+++ b/net/atm/clip.c
@@ -949,6 +949,11 @@ static int arp_seq_open(struct inode *inode, struct file *file)
seq = file->private_data;
seq->private = state;
+ state->ns.net = get_proc_net(inode);
+ if (!state->ns.net) {
+ seq_release_private(inode, file);
+ rc = -ENXIO;
+ }
return rc;
@@ -957,11 +962,19 @@ out_kfree:
goto out;
+static int arp_seq_release(struct inode *inode, struct file *file)
+ struct seq_file *seq = file->private_data;
+ struct clip_seq_state *state = seq->private;
+ put_net(state->ns.net);
+ return seq_release_private(inode, file);
static const struct file_operations arp_seq_fops = {
.open = arp_seq_open,
.read = seq_read,
.llseek = seq_lseek,
- .release = seq_release_private,
+ .release = arp_seq_release,
.owner = THIS_MODULE