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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-18 18:50:03 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-18 18:50:03 +0000
commit01a69402cf9d38ff180345d55c2ee51c7e89fbc7 (patch)
treeb406c5242a088c4f59c6e4b719b783f43aca6ae9 /net/ieee802154/pan.c
parentAdding upstream version 6.7.12. (diff)
downloadlinux-01a69402cf9d38ff180345d55c2ee51c7e89fbc7.tar.xz
linux-01a69402cf9d38ff180345d55c2ee51c7e89fbc7.zip
Adding upstream version 6.8.9.upstream/6.8.9
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/ieee802154/pan.c')
-rw-r--r--net/ieee802154/pan.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/net/ieee802154/pan.c b/net/ieee802154/pan.c
new file mode 100644
index 0000000000..249df7364b
--- /dev/null
+++ b/net/ieee802154/pan.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * IEEE 802.15.4 PAN management
+ *
+ * Copyright (C) 2023 Qorvo US, Inc
+ * Authors:
+ * - David Girault <david.girault@qorvo.com>
+ * - Miquel Raynal <miquel.raynal@bootlin.com>
+ */
+
+#include <linux/kernel.h>
+#include <net/cfg802154.h>
+#include <net/af_ieee802154.h>
+
+/* Checks whether a device address matches one from the PAN list.
+ * This helper is meant to be used only during PAN management, when we expect
+ * extended addresses to be used.
+ */
+static bool cfg802154_pan_device_is_matching(struct ieee802154_pan_device *pan_dev,
+ struct ieee802154_addr *ext_dev)
+{
+ if (!pan_dev || !ext_dev)
+ return false;
+
+ if (ext_dev->mode == IEEE802154_ADDR_SHORT)
+ return false;
+
+ return pan_dev->extended_addr == ext_dev->extended_addr;
+}
+
+bool cfg802154_device_is_associated(struct wpan_dev *wpan_dev)
+{
+ bool is_assoc;
+
+ mutex_lock(&wpan_dev->association_lock);
+ is_assoc = !list_empty(&wpan_dev->children) || wpan_dev->parent;
+ mutex_unlock(&wpan_dev->association_lock);
+
+ return is_assoc;
+}
+
+bool cfg802154_device_is_parent(struct wpan_dev *wpan_dev,
+ struct ieee802154_addr *target)
+{
+ lockdep_assert_held(&wpan_dev->association_lock);
+
+ return cfg802154_pan_device_is_matching(wpan_dev->parent, target);
+}
+EXPORT_SYMBOL_GPL(cfg802154_device_is_parent);
+
+struct ieee802154_pan_device *
+cfg802154_device_is_child(struct wpan_dev *wpan_dev,
+ struct ieee802154_addr *target)
+{
+ struct ieee802154_pan_device *child;
+
+ lockdep_assert_held(&wpan_dev->association_lock);
+
+ list_for_each_entry(child, &wpan_dev->children, node)
+ if (cfg802154_pan_device_is_matching(child, target))
+ return child;
+
+ 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);
+
+unsigned int cfg802154_set_max_associations(struct wpan_dev *wpan_dev,
+ unsigned int max)
+{
+ unsigned int old_max;
+
+ lockdep_assert_held(&wpan_dev->association_lock);
+
+ old_max = wpan_dev->max_associations;
+ wpan_dev->max_associations = max;
+
+ return old_max;
+}
+EXPORT_SYMBOL_GPL(cfg802154_set_max_associations);