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Date: Tue, 24 Sep 2013 17:27:10 +0100
From: James Chapman <jchapman@...alix.com>
To: netdev@...r.kernel.org
Cc: James Chapman <jchapman@...alix.com>
Subject: [RFC PATCH 2/2] l2tp: add vlan pseudowire support
Register the l2tp_eth driver for netlink ops using the vlan pseudowire
type. Add code to create/destroy a VLAN netdevice when the pseudowire
type is VLAN. This requires new exports in the vlan code.
This results in two netdevices per vlan pseudowire:
1. a master, which should never be used
2. a vlan device, which is enslaved to the master device
The session's ifname value is set to the VLAN netdevice name such
that it is the name returned in session_get netlink requests. For vlan
pseudowires, this should always be the interface that userspace
configures.
---
net/l2tp/l2tp_eth.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 71 insertions(+), 2 deletions(-)
diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c
index 76125c5..aae38d9 100644
--- a/net/l2tp/l2tp_eth.c
+++ b/net/l2tp/l2tp_eth.c
@@ -17,6 +17,7 @@
#include <linux/hash.h>
#include <linux/l2tp.h>
#include <linux/in.h>
+#include <linux/if_vlan.h>
#include <linux/etherdevice.h>
#include <linux/spinlock.h>
#include <net/sock.h>
@@ -53,6 +54,7 @@ struct l2tp_eth {
/* via l2tp_session_priv() */
struct l2tp_eth_sess {
struct net_device *dev;
+ struct net_device *vlan_dev;
};
/* per-net private data for this module */
@@ -178,6 +180,50 @@ error:
kfree_skb(skb);
}
+static int l2tp_vlan_create(struct l2tp_session *session, u16 vlan_id)
+{
+ struct l2tp_eth_sess *spriv;
+ struct net_device *dev;
+ struct net_device *vlan_dev;
+ char name[IFNAMSIZ + 1];
+ int rc;
+
+ spriv = l2tp_session_priv(session);
+ dev = spriv->dev;
+
+ if (!vlan_id)
+ return -EINVAL;
+
+ snprintf(name, IFNAMSIZ, "%s.%i", dev->name, vlan_id);
+ rtnl_lock();
+ rc = vlan_register_device(dev, vlan_id, &vlan_dev, name);
+ rtnl_unlock();
+ if (rc < 0)
+ return rc;
+
+ spriv->vlan_dev = vlan_dev;
+ strlcpy(session->ifname, vlan_dev->name, IFNAMSIZ);
+
+ return 0;
+}
+
+static int l2tp_vlan_delete(struct l2tp_session *session)
+{
+ struct l2tp_eth_sess *spriv;
+ struct net_device *dev;
+
+ spriv = l2tp_session_priv(session);
+ dev = spriv->dev;
+
+ rtnl_lock();
+ unregister_vlan_dev(spriv->vlan_dev, NULL);
+ rtnl_unlock();
+ strlcpy(session->ifname, dev->name, IFNAMSIZ);
+ spriv->vlan_dev = NULL;
+
+ return 0;
+}
+
static void l2tp_eth_delete(struct l2tp_session *session)
{
struct l2tp_eth_sess *spriv;
@@ -186,6 +232,8 @@ static void l2tp_eth_delete(struct l2tp_session *session)
if (session) {
spriv = l2tp_session_priv(session);
dev = spriv->dev;
+ if (spriv->vlan_dev)
+ l2tp_vlan_delete(session);
if (dev) {
unregister_netdev(dev);
spriv->dev = NULL;
@@ -277,10 +325,18 @@ static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 p
if (rc < 0)
goto out_del_dev;
- __module_get(THIS_MODULE);
/* Must be done after register_netdev() */
strlcpy(session->ifname, dev->name, IFNAMSIZ);
+ if (cfg->pw_type == L2TP_PWTYPE_ETH_VLAN) {
+ /* Create VLAN interface. Replaces session->ifname */
+ rc = l2tp_vlan_create(session, cfg->vlan_id);
+ if (rc < 0)
+ goto out_unreg;
+ }
+
+ __module_get(THIS_MODULE);
+
dev_hold(dev);
pn = l2tp_eth_pernet(dev_net(dev));
spin_lock(&pn->l2tp_eth_lock);
@@ -289,6 +345,8 @@ static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 p
return 0;
+out_unreg:
+ unregister_netdev(dev);
out_del_dev:
free_netdev(dev);
spriv->dev = NULL;
@@ -328,6 +386,11 @@ static int __init l2tp_eth_init(void)
err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops);
if (err)
goto out;
+#if IS_ENABLED(CONFIG_VLAN_8021Q)
+ err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH_VLAN, &l2tp_eth_nl_cmd_ops);
+ if (err)
+ goto out;
+#endif
err = register_pernet_device(&l2tp_eth_net_ops);
if (err)
@@ -338,6 +401,9 @@ static int __init l2tp_eth_init(void)
return 0;
out_unreg:
+#if IS_ENABLED(CONFIG_VLAN_8021Q)
+ l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH_VLAN);
+#endif
l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
out:
return err;
@@ -346,6 +412,9 @@ out:
static void __exit l2tp_eth_exit(void)
{
unregister_pernet_device(&l2tp_eth_net_ops);
+#if IS_ENABLED(CONFIG_VLAN_8021Q)
+ l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH_VLAN);
+#endif
l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
}
@@ -355,4 +424,4 @@ module_exit(l2tp_eth_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("James Chapman <jchapman@...alix.com>");
MODULE_DESCRIPTION("L2TP ethernet pseudowire driver");
-MODULE_VERSION("1.0");
+MODULE_VERSION("1.1");
--
1.7.0.4
--
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