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6lowpan: add private neighbour data

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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 <davem@davemloft.net>
Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: Alexander Aring <aar@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Aring 2016-06-15 21:20:16 +02:00 committed by David S. Miller
parent 6010097806
commit 8626a0c83b
3 changed files with 23 additions and 2 deletions
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3
include/linux/netdevice.h
View File

@ -1483,8 +1483,7 @@ 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

10
include/net/6lowpan.h
View File

@ -141,6 +141,16 @@ struct lowpan_dev {
u8 priv[0] __aligned(sizeof(void *));
};
struct lowpan_802154_neigh {
__le16 short_addr;
};
static inline
struct lowpan_802154_neigh *lowpan_802154_neigh(void *neigh_priv)
{
return neigh_priv;
}
static inline
struct lowpan_dev *lowpan_dev(const struct net_device *dev)
{

12
net/ieee802154/6lowpan/core.c
View File

@ -81,11 +81,21 @@ 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)
@ -150,6 +160,8 @@ 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 = sizeof(struct lowpan_802154_neigh);
ret = lowpan_register_netdevice(ldev, LOWPAN_LLTYPE_IEEE802154);
if (ret < 0) {
dev_put(wdev);