From 9860d9be89f420f3793fb798faadea11c723e08a Mon Sep 17 00:00:00 2001 From: Miquel Raynal Date: Wed, 27 Sep 2023 20:12:09 +0200 Subject: mac802154: Handle disassociations Devices may decide to disassociate from their coordinator for different reasons (device turning off, coordinator signal strength too low, etc), the MAC layer just has to send a disassociation notification. If the ack of the disassociation notification is not received, the device may consider itself disassociated anyway. Signed-off-by: Miquel Raynal Acked-by: Stefan Schmidt Acked-by: Alexander Aring Link: https://lore.kernel.org/linux-wpan/20230927181214.129346-7-miquel.raynal@bootlin.com --- net/mac802154/cfg.c | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 100 insertions(+) (limited to 'net/mac802154/cfg.c') diff --git a/net/mac802154/cfg.c b/net/mac802154/cfg.c index 0e8bb1486430..083de2d3fe37 100644 --- a/net/mac802154/cfg.c +++ b/net/mac802154/cfg.c @@ -383,6 +383,105 @@ free_parent: return ret; } +static int mac802154_disassociate_from_parent(struct wpan_phy *wpan_phy, + struct wpan_dev *wpan_dev) +{ + struct ieee802154_local *local = wpan_phy_priv(wpan_phy); + struct ieee802154_pan_device *child, *tmp; + struct ieee802154_sub_if_data *sdata; + u64 eaddr; + int ret; + + sdata = IEEE802154_WPAN_DEV_TO_SUB_IF(wpan_dev); + + /* Start by disassociating all the children and preventing new ones to + * attempt associations. + */ + list_for_each_entry_safe(child, tmp, &wpan_dev->children, node) { + ret = mac802154_send_disassociation_notif(sdata, child, + IEEE802154_COORD_WISHES_DEVICE_TO_LEAVE); + if (ret) { + eaddr = swab64((__force u64)child->extended_addr); + dev_err(&sdata->dev->dev, + "Disassociation with %8phC may have failed (%d)\n", + &eaddr, ret); + } + + list_del(&child->node); + } + + ret = mac802154_send_disassociation_notif(sdata, wpan_dev->parent, + IEEE802154_DEVICE_WISHES_TO_LEAVE); + if (ret) { + eaddr = swab64((__force u64)wpan_dev->parent->extended_addr); + dev_err(&sdata->dev->dev, + "Disassociation from %8phC may have failed (%d)\n", + &eaddr, ret); + } + + ret = 0; + + kfree(wpan_dev->parent); + wpan_dev->parent = NULL; + wpan_dev->pan_id = cpu_to_le16(IEEE802154_PAN_ID_BROADCAST); + wpan_dev->short_addr = cpu_to_le16(IEEE802154_ADDR_SHORT_BROADCAST); + + if (local->hw.flags & IEEE802154_HW_AFILT) { + ret = drv_set_pan_id(local, wpan_dev->pan_id); + if (ret < 0) + return ret; + + ret = drv_set_short_addr(local, wpan_dev->short_addr); + if (ret < 0) + return ret; + } + + return 0; +} + +static int mac802154_disassociate_child(struct wpan_phy *wpan_phy, + struct wpan_dev *wpan_dev, + struct ieee802154_pan_device *child) +{ + struct ieee802154_sub_if_data *sdata; + int ret; + + sdata = IEEE802154_WPAN_DEV_TO_SUB_IF(wpan_dev); + + ret = mac802154_send_disassociation_notif(sdata, child, + IEEE802154_COORD_WISHES_DEVICE_TO_LEAVE); + if (ret) + return ret; + + list_del(&child->node); + kfree(child); + + return 0; +} + +static int mac802154_disassociate(struct wpan_phy *wpan_phy, + struct wpan_dev *wpan_dev, + struct ieee802154_addr *target) +{ + u64 teaddr = swab64((__force u64)target->extended_addr); + struct ieee802154_pan_device *pan_device; + + ASSERT_RTNL(); + + if (cfg802154_device_is_parent(wpan_dev, target)) + return mac802154_disassociate_from_parent(wpan_phy, wpan_dev); + + pan_device = cfg802154_device_is_child(wpan_dev, target); + if (pan_device) + return mac802154_disassociate_child(wpan_phy, wpan_dev, + pan_device); + + dev_err(&wpan_dev->netdev->dev, + "Device %8phC is not associated with us\n", &teaddr); + + return -EINVAL; +} + #ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL static void ieee802154_get_llsec_table(struct wpan_phy *wpan_phy, @@ -595,6 +694,7 @@ const struct cfg802154_ops mac802154_config_ops = { .send_beacons = mac802154_send_beacons, .stop_beacons = mac802154_stop_beacons, .associate = mac802154_associate, + .disassociate = mac802154_disassociate, #ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL .get_llsec_table = ieee802154_get_llsec_table, .lock_llsec_table = ieee802154_lock_llsec_table, -- cgit v1.2.3