| 1 | |
| 2 | |
| 3 | * IEEE 802.15.4 PAN management
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| 4 | *
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| 5 | * Copyright (C) 2023 Qorvo US, Inc
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| 6 | * Authors:
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| 7 | * - David Girault <[email protected]>
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| 8 | * - Miquel Raynal <[email protected]>
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| 9 |
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| 10 |
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| 11 | #include <linux/kernel.h>
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| 12 | #include <net/cfg802154.h>
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| 13 | #include <net/af_ieee802154.h>
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| 14 |
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| 15 | |
| 16 | * This helper is meant to be used only during PAN management, when we expect
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| 17 | * extended addresses to be used.
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| 18 |
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| 19 | static bool cfg802154_pan_device_is_matching(struct ieee802154_pan_device *pan_dev,
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| 20 | struct ieee802154_addr *ext_dev)
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| 21 | {
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| 22 | if (!pan_dev || !ext_dev)
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| 23 | return false;
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| 24 |
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| 25 | if (ext_dev->mode == IEEE802154_ADDR_SHORT)
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| 26 | return false;
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| 27 |
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| 28 | return pan_dev->extended_addr == ext_dev->extended_addr;
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| 29 | }
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| 30 |
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| 31 | bool cfg802154_device_is_associated(struct wpan_dev *wpan_dev)
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| 32 | {
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| 33 | bool is_assoc;
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| 34 |
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| 35 | mutex_lock(&wpan_dev->association_lock);
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| 36 | is_assoc = !list_empty(&wpan_dev->children) || wpan_dev->parent;
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| 37 | mutex_unlock(&wpan_dev->association_lock);
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| 38 |
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| 39 | return is_assoc;
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| 40 | }
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| 41 |
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| 42 | bool cfg802154_device_is_parent(struct wpan_dev *wpan_dev,
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| 43 | struct ieee802154_addr *target)
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| 44 | {
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| 45 | lockdep_assert_held(&wpan_dev->association_lock);
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| 46 |
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| 47 | return cfg802154_pan_device_is_matching(wpan_dev->parent, target);
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| 48 | }
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| 49 | EXPORT_SYMBOL_GPL(cfg802154_device_is_parent);
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| 50 |
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| 51 | struct ieee802154_pan_device *
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| 52 | cfg802154_device_is_child(struct wpan_dev *wpan_dev,
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| 53 | struct ieee802154_addr *target)
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| 54 | {
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| 55 | struct ieee802154_pan_device *child;
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| 56 |
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| 57 | lockdep_assert_held(&wpan_dev->association_lock);
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| 58 |
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| 59 | list_for_each_entry(child, &wpan_dev->children, node)
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| 60 | if (cfg802154_pan_device_is_matching(child, target))
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| 61 | return child;
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| 62 |
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| 63 | return NULL;
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| 64 | }
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| 65 | EXPORT_SYMBOL_GPL(cfg802154_device_is_child);
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| 66 |
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| 67 | __le16 cfg802154_get_free_short_addr(struct wpan_dev *wpan_dev)
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| 68 | {
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| 69 | struct ieee802154_pan_device *child;
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| 70 | __le16 addr;
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| 71 |
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| 72 | lockdep_assert_held(&wpan_dev->association_lock);
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| 73 |
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| 74 | do {
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| 75 | get_random_bytes(&addr, 2);
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| 76 | if (addr == cpu_to_le16(IEEE802154_ADDR_SHORT_BROADCAST) ||
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| 77 | addr == cpu_to_le16(IEEE802154_ADDR_SHORT_UNSPEC))
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| 78 | continue;
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| 79 |
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| 80 | if (wpan_dev->short_addr == addr)
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| 81 | continue;
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| 82 |
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| 83 | if (wpan_dev->parent && wpan_dev->parent->short_addr == addr)
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| 84 | continue;
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| 85 |
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| 86 | list_for_each_entry(child, &wpan_dev->children, node)
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| 87 | if (child->short_addr == addr)
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| 88 | continue;
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| 89 |
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| 90 | break;
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| 91 | } while (1);
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| 92 |
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| 93 | return addr;
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| 94 | }
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| 95 | EXPORT_SYMBOL_GPL(cfg802154_get_free_short_addr);
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| 96 |
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| 97 | unsigned int cfg802154_set_max_associations(struct wpan_dev *wpan_dev,
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| 98 | unsigned int max)
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| 99 | {
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| 100 | unsigned int old_max;
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| 101 |
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| 102 | lockdep_assert_held(&wpan_dev->association_lock);
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| 103 |
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| 104 | old_max = wpan_dev->max_associations;
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| 105 | wpan_dev->max_associations = max;
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| 106 |
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| 107 | return old_max;
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| 108 | }
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| 109 | EXPORT_SYMBOL_GPL(cfg802154_set_max_associations);
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