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2373699560
While disassociating from a PAN ourselves, let's set the maximum number of associations temporarily to zero to be sure no new device tries to associate with us. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Acked-by: Stefan Schmidt <stefan@datenfreihafen.org> Acked-by: Alexander Aring <aahringo@redhat.com> Link: https://lore.kernel.org/linux-wpan/20231128111655.507479-6-miquel.raynal@bootlin.com
110 lines
2.6 KiB
C
110 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* IEEE 802.15.4 PAN management
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*
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* Copyright (C) 2023 Qorvo US, Inc
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* Authors:
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* - David Girault <david.girault@qorvo.com>
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* - Miquel Raynal <miquel.raynal@bootlin.com>
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*/
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#include <linux/kernel.h>
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#include <net/cfg802154.h>
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#include <net/af_ieee802154.h>
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/* Checks whether a device address matches one from the PAN list.
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* This helper is meant to be used only during PAN management, when we expect
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* extended addresses to be used.
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*/
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static bool cfg802154_pan_device_is_matching(struct ieee802154_pan_device *pan_dev,
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struct ieee802154_addr *ext_dev)
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{
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if (!pan_dev || !ext_dev)
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return false;
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if (ext_dev->mode == IEEE802154_ADDR_SHORT)
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return false;
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return pan_dev->extended_addr == ext_dev->extended_addr;
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}
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bool cfg802154_device_is_associated(struct wpan_dev *wpan_dev)
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{
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bool is_assoc;
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mutex_lock(&wpan_dev->association_lock);
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is_assoc = !list_empty(&wpan_dev->children) || wpan_dev->parent;
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mutex_unlock(&wpan_dev->association_lock);
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return is_assoc;
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}
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bool cfg802154_device_is_parent(struct wpan_dev *wpan_dev,
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struct ieee802154_addr *target)
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{
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lockdep_assert_held(&wpan_dev->association_lock);
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return cfg802154_pan_device_is_matching(wpan_dev->parent, target);
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}
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EXPORT_SYMBOL_GPL(cfg802154_device_is_parent);
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struct ieee802154_pan_device *
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cfg802154_device_is_child(struct wpan_dev *wpan_dev,
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struct ieee802154_addr *target)
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{
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struct ieee802154_pan_device *child;
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lockdep_assert_held(&wpan_dev->association_lock);
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list_for_each_entry(child, &wpan_dev->children, node)
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if (cfg802154_pan_device_is_matching(child, target))
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return child;
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return NULL;
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}
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EXPORT_SYMBOL_GPL(cfg802154_device_is_child);
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__le16 cfg802154_get_free_short_addr(struct wpan_dev *wpan_dev)
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{
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struct ieee802154_pan_device *child;
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__le16 addr;
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lockdep_assert_held(&wpan_dev->association_lock);
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do {
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get_random_bytes(&addr, 2);
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if (addr == cpu_to_le16(IEEE802154_ADDR_SHORT_BROADCAST) ||
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addr == cpu_to_le16(IEEE802154_ADDR_SHORT_UNSPEC))
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continue;
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if (wpan_dev->short_addr == addr)
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continue;
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if (wpan_dev->parent && wpan_dev->parent->short_addr == addr)
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continue;
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list_for_each_entry(child, &wpan_dev->children, node)
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if (child->short_addr == addr)
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continue;
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break;
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} while (1);
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return addr;
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}
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EXPORT_SYMBOL_GPL(cfg802154_get_free_short_addr);
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unsigned int cfg802154_set_max_associations(struct wpan_dev *wpan_dev,
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unsigned int max)
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{
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unsigned int old_max;
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lockdep_assert_held(&wpan_dev->association_lock);
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old_max = wpan_dev->max_associations;
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wpan_dev->max_associations = max;
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return old_max;
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}
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EXPORT_SYMBOL_GPL(cfg802154_set_max_associations);
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