[RFC bluetooth-next 12/19] 6lowpan: add private neighbour data

[Alexander Aring <aar@pengutronix.de>]

This patch will introduce a 6lowpan neighbour private data. Like the
interface private data we handle private data for generic 6lowpan and
for link-layer specific 6lowpan.

The current first use case if to save the short address for a 802.15.4
6lowpan neighbour.

Signed-off-by: Alexander Aring <aar@pengutronix.de>
---
 include/linux/netdevice.h     |  3 +--
 include/net/6lowpan.h         | 24 ++++++++++++++++++++++++
 net/bluetooth/6lowpan.c       |  2 ++
 net/ieee802154/6lowpan/core.c | 12 ++++++++++++
 4 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index be693b3..26e1c8f 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1478,8 +1478,7 @@ enum netdev_priv_flags {
  * 	@perm_addr:		Permanent hw address
  * 	@addr_assign_type:	Hw address assignment type
  * 	@addr_len:		Hardware address length
- * 	@neigh_priv_len;	Used in neigh_alloc(),
- * 				initialized only in atm/clip.c
+ *	@neigh_priv_len;	Used in neigh_alloc()
  * 	@dev_id:		Used to differentiate devices that share
  * 				the same link layer address
  * 	@dev_port:		Used to differentiate devices that share
diff --git a/include/net/6lowpan.h b/include/net/6lowpan.h
index 4e465c7..5784db7 100644
--- a/include/net/6lowpan.h
+++ b/include/net/6lowpan.h
@@ -98,6 +98,9 @@ static inline bool lowpan_is_iphc(u8 dispatch)
 #define LOWPAN_PRIV_SIZE(llpriv_size)	\
 	(sizeof(struct lowpan_dev) + llpriv_size)
 
+#define LOWPAN_NEIGH_PRIV_SIZE(llneigh_priv_size)	\
+	(sizeof(struct lowpan_neigh) + llneigh_priv_size)
+
 enum lowpan_lltypes {
 	LOWPAN_LLTYPE_BTLE,
 	LOWPAN_LLTYPE_IEEE802154,
@@ -141,6 +144,27 @@ struct lowpan_dev {
 	u8 priv[0] __aligned(sizeof(void *));
 };
 
+struct lowpan_neigh {
+	/* 6LoWPAN neigh private data */
+	/* must be last */
+	u8 priv[0] __aligned(sizeof(void *));
+};
+
+struct lowpan_802154_neigh {
+	__le16 short_addr;
+};
+
+static inline struct lowpan_neigh *lowpan_neigh(void *neigh_priv)
+{
+	return neigh_priv;
+}
+
+static inline
+struct lowpan_802154_neigh *lowpan_802154_neigh(void *neigh_priv)
+{
+	return (struct lowpan_802154_neigh *)lowpan_neigh(neigh_priv)->priv;
+}
+
 static inline
 struct lowpan_dev *lowpan_dev(const struct net_device *dev)
 {
diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
index 38e82dd..b7c4efa 100644
--- a/net/bluetooth/6lowpan.c
+++ b/net/bluetooth/6lowpan.c
@@ -833,6 +833,8 @@ static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev)
 	list_add_rcu(&(*dev)->list, &bt_6lowpan_devices);
 	spin_unlock(&devices_lock);
 
+	netdev->neigh_priv_len = LOWPAN_NEIGH_PRIV_SIZE(0);
+
 	err = lowpan_register_netdev(netdev, LOWPAN_LLTYPE_BTLE);
 	if (err < 0) {
 		BT_INFO("register_netdev failed %d", err);
diff --git a/net/ieee802154/6lowpan/core.c b/net/ieee802154/6lowpan/core.c
index dd085db..3162632 100644
--- a/net/ieee802154/6lowpan/core.c
+++ b/net/ieee802154/6lowpan/core.c
@@ -92,11 +92,21 @@ static int lowpan_stop(struct net_device *dev)
 	return 0;
 }
 
+static int lowpan_neigh_construct(struct neighbour *n)
+{
+	struct lowpan_802154_neigh *neigh = lowpan_802154_neigh(neighbour_priv(n));
+
+	/* default no short_addr is available for a neighbour */
+	neigh->short_addr = cpu_to_le16(IEEE802154_ADDR_SHORT_UNSPEC);
+	return 0;
+}
+
 static const struct net_device_ops lowpan_netdev_ops = {
 	.ndo_init		= lowpan_dev_init,
 	.ndo_start_xmit		= lowpan_xmit,
 	.ndo_open		= lowpan_open,
 	.ndo_stop		= lowpan_stop,
+	.ndo_neigh_construct    = lowpan_neigh_construct,
 };
 
 static void lowpan_setup(struct net_device *ldev)
@@ -161,6 +171,8 @@ static int lowpan_newlink(struct net *src_net, struct net_device *ldev,
 				wdev->needed_headroom;
 	ldev->needed_tailroom = wdev->needed_tailroom;
 
+	ldev->neigh_priv_len = LOWPAN_NEIGH_PRIV_SIZE(sizeof(struct lowpan_802154_neigh));
+
 	ret = lowpan_register_netdevice(ldev, LOWPAN_LLTYPE_IEEE802154);
 	if (ret < 0) {
 		dev_put(wdev);
-- 
2.7.4