diff options
Diffstat (limited to 'net/ieee802154/pan.c')
| -rw-r--r-- | net/ieee802154/pan.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/net/ieee802154/pan.c b/net/ieee802154/pan.c index 43b8d2df2186..545461069197 100644 --- a/net/ieee802154/pan.c +++ b/net/ieee802154/pan.c @@ -63,3 +63,33 @@ cfg802154_device_is_child(struct wpan_dev *wpan_dev, return NULL; } EXPORT_SYMBOL_GPL(cfg802154_device_is_child); + +__le16 cfg802154_get_free_short_addr(struct wpan_dev *wpan_dev) +{ + struct ieee802154_pan_device *child; + __le16 addr; + + lockdep_assert_held(&wpan_dev->association_lock); + + do { + get_random_bytes(&addr, 2); + if (addr == cpu_to_le16(IEEE802154_ADDR_SHORT_BROADCAST) || + addr == cpu_to_le16(IEEE802154_ADDR_SHORT_UNSPEC)) + continue; + + if (wpan_dev->short_addr == addr) + continue; + + if (wpan_dev->parent && wpan_dev->parent->short_addr == addr) + continue; + + list_for_each_entry(child, &wpan_dev->children, node) + if (child->short_addr == addr) + continue; + + break; + } while (1); + + return addr; +} +EXPORT_SYMBOL_GPL(cfg802154_get_free_short_addr); |