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-rw-r--r--net/mpls/af_mpls.c68
-rw-r--r--net/mpls/internal.h3
2 files changed, 69 insertions, 2 deletions
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index ad45017eed99..9fdd94cba83e 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -150,7 +150,7 @@ static int mpls_forward(struct sk_buff *skb, struct net_device *dev,
/* Careful this entire function runs inside of an rcu critical section */
mdev = mpls_dev_get(dev);
- if (!mdev)
+ if (!mdev || !mdev->input_enabled)
goto drop;
if (skb->pkt_type != PACKET_HOST)
@@ -438,6 +438,60 @@ errout:
return err;
}
+#define MPLS_PERDEV_SYSCTL_OFFSET(field) \
+ (&((struct mpls_dev *)0)->field)
+
+static const struct ctl_table mpls_dev_table[] = {
+ {
+ .procname = "input",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled),
+ },
+ { }
+};
+
+static int mpls_dev_sysctl_register(struct net_device *dev,
+ struct mpls_dev *mdev)
+{
+ char path[sizeof("net/mpls/conf/") + IFNAMSIZ];
+ struct ctl_table *table;
+ int i;
+
+ table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL);
+ if (!table)
+ goto out;
+
+ /* Table data contains only offsets relative to the base of
+ * the mdev at this point, so make them absolute.
+ */
+ for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++)
+ table[i].data = (char *)mdev + (uintptr_t)table[i].data;
+
+ snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name);
+
+ mdev->sysctl = register_net_sysctl(dev_net(dev), path, table);
+ if (!mdev->sysctl)
+ goto free;
+
+ return 0;
+
+free:
+ kfree(table);
+out:
+ return -ENOBUFS;
+}
+
+static void mpls_dev_sysctl_unregister(struct mpls_dev *mdev)
+{
+ struct ctl_table *table;
+
+ table = mdev->sysctl->ctl_table_arg;
+ unregister_net_sysctl_table(mdev->sysctl);
+ kfree(table);
+}
+
static struct mpls_dev *mpls_add_dev(struct net_device *dev)
{
struct mpls_dev *mdev;
@@ -449,9 +503,17 @@ static struct mpls_dev *mpls_add_dev(struct net_device *dev)
if (!mdev)
return ERR_PTR(err);
+ err = mpls_dev_sysctl_register(dev, mdev);
+ if (err)
+ goto free;
+
rcu_assign_pointer(dev->mpls_ptr, mdev);
return mdev;
+
+free:
+ kfree(mdev);
+ return ERR_PTR(err);
}
static void mpls_ifdown(struct net_device *dev)
@@ -475,6 +537,8 @@ static void mpls_ifdown(struct net_device *dev)
if (!mdev)
return;
+ mpls_dev_sysctl_unregister(mdev);
+
RCU_INIT_POINTER(dev->mpls_ptr, NULL);
kfree(mdev);
@@ -958,7 +1022,7 @@ static int mpls_platform_labels(struct ctl_table *table, int write,
return ret;
}
-static struct ctl_table mpls_table[] = {
+static const struct ctl_table mpls_table[] = {
{
.procname = "platform_labels",
.data = NULL,
diff --git a/net/mpls/internal.h b/net/mpls/internal.h
index 8090cb3099b4..693877d69606 100644
--- a/net/mpls/internal.h
+++ b/net/mpls/internal.h
@@ -23,6 +23,9 @@ struct mpls_entry_decoded {
};
struct mpls_dev {
+ int input_enabled;
+
+ struct ctl_table_header *sysctl;
};
struct sk_buff;