[PATCH net-next v3 1/6] net/x25: handle additional netdev events

[Martin Schiller <ms@dev.tdt.de>]

Add / remove x25_link_device by NETDEV_REGISTER/UNREGISTER and also by
NETDEV_POST_TYPE_CHANGE/NETDEV_PRE_TYPE_CHANGE.

This change is needed so that the x25_neigh struct for an interface is
already created when it shows up and is kept independently if the
interface goes UP or DOWN.

This is used in an upcomming commit, where x25 params of an neighbour
will get configurable through ioctls.

Additionally the NETDEV_CHANGE event makes it possible to handle carrier
loss and detection.

Signed-off-by: Martin Schiller <ms@dev.tdt.de>
---
 include/net/x25.h  |  2 ++
 net/x25/af_x25.c   | 44 ++++++++++++++++++++++++++++++++++++++++++++
 net/x25/x25_link.c | 45 +++++++++++++++++++++++++++++++++++++++------
 3 files changed, 85 insertions(+), 6 deletions(-)

diff --git a/include/net/x25.h b/include/net/x25.h
index d7d6c2b4ffa7..4c1502e8b2b2 100644
--- a/include/net/x25.h
+++ b/include/net/x25.h
@@ -231,6 +231,8 @@ int x25_backlog_rcv(struct sock *, struct sk_buff *);
 
 /* x25_link.c */
 void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
+void x25_link_device_add(struct net_device *dev);
+void x25_link_device_remove(struct net_device *dev);
 void x25_link_device_up(struct net_device *);
 void x25_link_device_down(struct net_device *);
 void x25_link_established(struct x25_neigh *);
diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c
index 046d3fee66a9..02f56386e05b 100644
--- a/net/x25/af_x25.c
+++ b/net/x25/af_x25.c
@@ -233,10 +233,24 @@ static int x25_device_event(struct notifier_block *this, unsigned long event,
 #endif
 	 ) {
 		switch (event) {
+		case NETDEV_REGISTER:
+			pr_debug("X.25: got event NETDEV_REGISTER for device: %s\n",
+				 dev->name);
+			x25_link_device_add(dev);
+			break;
+		case NETDEV_POST_TYPE_CHANGE:
+			pr_debug("X.25: got event NETDEV_POST_TYPE_CHANGE for device: %s\n",
+				 dev->name);
+			x25_link_device_add(dev);
+			break;
 		case NETDEV_UP:
+			pr_debug("X.25: got event NETDEV_UP for device: %s\n",
+				 dev->name);
 			x25_link_device_up(dev);
 			break;
 		case NETDEV_GOING_DOWN:
+			pr_debug("X.25: got event NETDEV_GOING_DOWN for device: %s\n",
+				 dev->name);
 			nb = x25_get_neigh(dev);
 			if (nb) {
 				x25_terminate_link(nb);
@@ -244,10 +258,40 @@ static int x25_device_event(struct notifier_block *this, unsigned long event,
 			}
 			break;
 		case NETDEV_DOWN:
+			pr_debug("X.25: got event NETDEV_DOWN for device: %s\n",
+				 dev->name);
 			x25_kill_by_device(dev);
 			x25_route_device_down(dev);
 			x25_link_device_down(dev);
 			break;
+		case NETDEV_PRE_TYPE_CHANGE:
+			pr_debug("X.25: got event NETDEV_PRE_TYPE_CHANGE for device: %s\n",
+				 dev->name);
+			x25_link_device_remove(dev);
+			break;
+		case NETDEV_UNREGISTER:
+			pr_debug("X.25: got event NETDEV_UNREGISTER for device: %s\n",
+				 dev->name);
+			x25_link_device_remove(dev);
+			break;
+		case NETDEV_CHANGE:
+			pr_debug("X.25: got event NETDEV_CHANGE for device: %s\n",
+				 dev->name);
+			nb = x25_get_neigh(dev);
+			if (!nb)
+				break;
+
+			if (!netif_carrier_ok(dev)) {
+				pr_debug("X.25: Carrier lost -> set link state down: %s\n",
+					 dev->name);
+				x25_terminate_link(nb);
+			} else {
+				pr_debug("X.25: Carrier detected: %s\n",
+					 dev->name);
+				x25_establish_link(nb);
+			}
+			x25_neigh_put(nb);
+			break;
 		}
 	}
 
diff --git a/net/x25/x25_link.c b/net/x25/x25_link.c
index fdae054b7dc1..92828a8a4ada 100644
--- a/net/x25/x25_link.c
+++ b/net/x25/x25_link.c
@@ -239,9 +239,17 @@ void x25_link_terminated(struct x25_neigh *nb)
 /*
  *	Add a new device.
  */
-void x25_link_device_up(struct net_device *dev)
+void x25_link_device_add(struct net_device *dev)
 {
-	struct x25_neigh *nb = kmalloc(sizeof(*nb), GFP_ATOMIC);
+	struct x25_neigh *nb = x25_get_neigh(dev);
+
+	/* Check, if we already have a neighbour for this device */
+	if (nb) {
+		x25_neigh_put(nb);
+		return;
+	}
+
+	nb = kmalloc(sizeof(*nb), GFP_ATOMIC);
 
 	if (!nb)
 		return;
@@ -268,6 +276,20 @@ void x25_link_device_up(struct net_device *dev)
 	write_unlock_bh(&x25_neigh_list_lock);
 }
 
+/* A device is coming up */
+void x25_link_device_up(struct net_device *dev)
+{
+	struct x25_neigh *nb = x25_get_neigh(dev);
+
+	if (!nb)
+		return;
+
+	nb->state = X25_LINK_STATE_1;
+	x25_establish_link(nb);
+
+	x25_neigh_put(nb);
+}
+
 /**
  *	__x25_remove_neigh - remove neighbour from x25_neigh_list
  *	@nb: - neigh to remove
@@ -277,9 +299,6 @@ void x25_link_device_up(struct net_device *dev)
  */
 static void __x25_remove_neigh(struct x25_neigh *nb)
 {
-	skb_queue_purge(&nb->queue);
-	x25_stop_t20timer(nb);
-
 	if (nb->node.next) {
 		list_del(&nb->node);
 		x25_neigh_put(nb);
@@ -289,7 +308,7 @@ static void __x25_remove_neigh(struct x25_neigh *nb)
 /*
  *	A device has been removed, remove its links.
  */
-void x25_link_device_down(struct net_device *dev)
+void x25_link_device_remove(struct net_device *dev)
 {
 	struct x25_neigh *nb;
 	struct list_head *entry, *tmp;
@@ -308,6 +327,20 @@ void x25_link_device_down(struct net_device *dev)
 	write_unlock_bh(&x25_neigh_list_lock);
 }
 
+/* A device is going down */
+void x25_link_device_down(struct net_device *dev)
+{
+	struct x25_neigh *nb = x25_get_neigh(dev);
+
+	if (!nb)
+		return;
+
+	skb_queue_purge(&nb->queue);
+	x25_stop_t20timer(nb);
+
+	x25_neigh_put(nb);
+}
+
 /*
  *	Given a device, return the neighbour address.
  */
-- 
2.20.1