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.
Cc: David S. Miller <da...@davemloft.net>
Signed-off-by: Alexander Aring <a...@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 166402a..0052c42 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1487,8 +1487,7 @@ 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 da84cf9..61c6517 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);
--
2.8.0
