@@ -18,3 +18,12 @@ platform_labels - INTEGER
Possible values: 0 - 1048575
Default: 0
+
+conf/<interface>/input - BOOL
+ Control whether packets can be input on this interface.
+
+ If disabled, packets will be discarded without further
+ processing.
+
+ 0 - disabled (default)
+ not 0 - enabled
@@ -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 +503,24 @@ static struct mpls_dev *mpls_add_dev(struct net_device *dev)
if (!mdev)
return ERR_PTR(err);
+ /* Enable MPLS by default on loopback devices, since this
+ * doesn't represent a security boundary and is required for the
+ * lookup of inner labels for LSPs terminating on this router.
+ */
+ if (dev->flags & IFF_LOOPBACK)
+ mdev->input_enabled = 1;
+
+ 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 +544,8 @@ 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 +1029,7 @@ 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,
@@ -23,6 +23,9 @@ struct mpls_entry_decoded {
};
struct mpls_dev {
+ int input_enabled;
+
+ struct ctl_table_header *sysctl;
};
struct sk_buff;
An MPLS network is a single trust domain where the edges must be in control of what labels make their way into the core. The simplest way of ensuring this is for the edge device to always impose the labels, and not allow forward labeled traffic from untrusted neighbours. This is achieved by allowing a per-device configuration of whether MPLS traffic input from that interface should be processed or not. To be secure by default, the default state is changed to MPLS being disabled on all interfaces (except the loopback) unless explicitly enabled and no global option is provided to change the default. Whilst this differs from other protocols (e.g. IPv6), network operators are used to explicitly enabling MPLS forwarding on interfaces, and with the number of links to the MPLS core typically fairly low this doesn't present too much of a burden on operators. Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Robert Shearman <rshearma@brocade.com> --- Documentation/networking/mpls-sysctl.txt | 9 ++++ net/mpls/af_mpls.c | 75 +++++++++++++++++++++++++++++++- net/mpls/internal.h | 3 ++ 3 files changed, 85 insertions(+), 2 deletions(-)