netfilter: add support for flushing conntrack via /proc

Backport of r35330

SVN-Revision: 35331

diff --git a/target/linux/generic/patches-3.3/605-netfilter_conntrack_flush.patch b/target/linux/generic/patches-3.3/605-netfilter_conntrack_flush.patch
new file mode 100644 (file)
index 0000000..cbcd29a
--- /dev/null
+++ b/target/linux/generic/patches-3.3/605-netfilter_conntrack_flush.patch
@@ -0,0 +1,46 @@
+--- a/net/netfilter/nf_conntrack_standalone.c
++++ b/net/netfilter/nf_conntrack_standalone.c
+@@ -267,10 +267,34 @@ static int ct_open(struct inode *inode, 
+                       sizeof(struct ct_iter_state));
+ }
+ 
++static int kill_all(struct nf_conn *i, void *data)
++{
++    return 1;
++}
++
++static ssize_t ct_file_write(struct file *file, const char __user *buf,
++                           size_t count, loff_t *ppos)
++{
++      struct seq_file *seq = file->private_data;
++      struct net *net = seq_file_net(seq);
++
++      if (count) {
++              char c;
++
++              if (get_user(c, buf))
++                      return -EFAULT;
++
++              if (c == 'f')
++                      nf_ct_iterate_cleanup(net, kill_all, NULL);
++      }
++      return count;
++}
++
+ static const struct file_operations ct_file_ops = {
+       .owner   = THIS_MODULE,
+       .open    = ct_open,
+       .read    = seq_read,
++      .write   = ct_file_write,
+       .llseek  = seq_lseek,
+       .release = seq_release_net,
+ };
+@@ -372,7 +396,7 @@ static int nf_conntrack_standalone_init_
+ {
+       struct proc_dir_entry *pde;
+ 
+-      pde = proc_net_fops_create(net, "nf_conntrack", 0440, &ct_file_ops);
++      pde = proc_net_fops_create(net, "nf_conntrack", 0660, &ct_file_ops);
+       if (!pde)
+               goto out_nf_conntrack;
+