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authorMiquel Raynal <miquel.raynal@bootlin.com>2023-09-27 21:12:05 +0300
committerMiquel Raynal <miquel.raynal@bootlin.com>2023-11-20 13:41:06 +0300
commit2e7ed75e92fc493ff5484f61aed6489262c78f3e (patch)
tree0b38fd6db5e22f1c4564550e18cc6b51c0a58e6f /net/ieee802154
parent5260adf86b6732c75136fc1b159bb370062ddfa8 (diff)
downloadlinux-2e7ed75e92fc493ff5484f61aed6489262c78f3e.tar.xz
ieee802154: Internal PAN management
Introduce structures to describe peer devices in a PAN as well as a few related helpers. We basically care about: - Our unique parent after associating with a coordinator. - Peer devices, children, which successfully associated 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/20230927181214.129346-3-miquel.raynal@bootlin.com
Diffstat (limited to 'net/ieee802154')
-rw-r--r--net/ieee802154/Makefile2
-rw-r--r--net/ieee802154/core.c2
-rw-r--r--net/ieee802154/pan.c63
3 files changed, 66 insertions, 1 deletions
diff --git a/net/ieee802154/Makefile b/net/ieee802154/Makefile
index f05b7bdae2aa..7bce67673e83 100644
--- a/net/ieee802154/Makefile
+++ b/net/ieee802154/Makefile
@@ -4,7 +4,7 @@ obj-$(CONFIG_IEEE802154_SOCKET) += ieee802154_socket.o
obj-y += 6lowpan/
ieee802154-y := netlink.o nl-mac.o nl-phy.o nl_policy.o core.o \
- header_ops.o sysfs.o nl802154.o trace.o
+ header_ops.o sysfs.o nl802154.o trace.o pan.o
ieee802154_socket-y := socket.o
CFLAGS_trace.o := -I$(src)
diff --git a/net/ieee802154/core.c b/net/ieee802154/core.c
index 57546e07e06a..cd69bdbfd59f 100644
--- a/net/ieee802154/core.c
+++ b/net/ieee802154/core.c
@@ -276,6 +276,8 @@ static int cfg802154_netdev_notifier_call(struct notifier_block *nb,
wpan_dev->identifier = ++rdev->wpan_dev_id;
list_add_rcu(&wpan_dev->list, &rdev->wpan_dev_list);
rdev->devlist_generation++;
+ mutex_init(&wpan_dev->association_lock);
+ INIT_LIST_HEAD(&wpan_dev->children);
wpan_dev->netdev = dev;
break;
diff --git a/net/ieee802154/pan.c b/net/ieee802154/pan.c
new file mode 100644
index 000000000000..2b30e7b19ac3
--- /dev/null
+++ b/net/ieee802154/pan.c
@@ -0,0 +1,63 @@
+// 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);
+}
+
+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;
+}