Commit 2e7ed75e authored by Miquel Raynal's avatar Miquel Raynal

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: default avatarMiquel Raynal <miquel.raynal@bootlin.com>
Acked-by: default avatarStefan Schmidt <stefan@datenfreihafen.org>
Acked-by: default avatarAlexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/linux-wpan/20230927181214.129346-3-miquel.raynal@bootlin.com
parent 5260adf8
......@@ -303,6 +303,22 @@ struct ieee802154_coord_desc {
bool gts_permit;
};
/**
* struct ieee802154_pan_device - PAN device information
* @pan_id: the PAN ID of this device
* @mode: the preferred mode to reach the device
* @short_addr: the short address of this device
* @extended_addr: the extended address of this device
* @node: the list node
*/
struct ieee802154_pan_device {
__le16 pan_id;
u8 mode;
__le16 short_addr;
__le64 extended_addr;
struct list_head node;
};
/**
* struct cfg802154_scan_request - Scan request
*
......@@ -478,6 +494,11 @@ struct wpan_dev {
/* fallback for acknowledgment bit setting */
bool ackreq;
/* Associations */
struct mutex association_lock;
struct ieee802154_pan_device *parent;
struct list_head children;
};
#define to_phy(_dev) container_of(_dev, struct wpan_phy, dev)
......@@ -529,4 +550,30 @@ static inline const char *wpan_phy_name(struct wpan_phy *phy)
void ieee802154_configure_durations(struct wpan_phy *phy,
unsigned int page, unsigned int channel);
/**
* cfg802154_device_is_associated - Checks whether we are associated to any device
* @wpan_dev: the wpan device
* @return: true if we are associated
*/
bool cfg802154_device_is_associated(struct wpan_dev *wpan_dev);
/**
* cfg802154_device_is_parent - Checks if a device is our coordinator
* @wpan_dev: the wpan device
* @target: the expected parent
* @return: true if @target is our coordinator
*/
bool cfg802154_device_is_parent(struct wpan_dev *wpan_dev,
struct ieee802154_addr *target);
/**
* cfg802154_device_is_child - Checks whether a device is associated to us
* @wpan_dev: the wpan device
* @target: the expected child
* @return: the PAN device
*/
struct ieee802154_pan_device *
cfg802154_device_is_child(struct wpan_dev *wpan_dev,
struct ieee802154_addr *target);
#endif /* __NET_CFG802154_H */
......@@ -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)
......@@ -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;
......
// 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;
}
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment