Let's introduce helpers for giving the MAC layer a generic interface for
advertising discovered coordinators/PANs upon beacon reception. This
support requires the MAC layers to:
- Allocate a coordinator/PAN descriptor and fill it.
- Register this structure, giving the generic ieee802154 layer the
necessary information about the coordinator/PAN the beacon originates
from.
- To flush all the allocated structures once the scan is done.
The generic layer keeps a temporary list of the discovered coordinators
to tell the user whether or not the beacon comes from a new device or
not, so stateless userspace applications might not spam the user with
identical information if not required.
Co-developed-by: David Girault <david.girault@xxxxxxxxx>
Signed-off-by: David Girault <david.girault@xxxxxxxxx>
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
---
include/net/cfg802154.h | 12 ++++
net/ieee802154/Makefile | 2 +-
net/ieee802154/core.c | 2 +
net/ieee802154/nl802154.c | 2 +
net/ieee802154/pan.c | 114 ++++++++++++++++++++++++++++++++++++++
5 files changed, 131 insertions(+), 1 deletion(-)
create mode 100644 net/ieee802154/pan.c
diff --git a/include/net/cfg802154.h b/include/net/cfg802154.h
index 8d67d9ed438d..3057b4e0726c 100644
--- a/include/net/cfg802154.h
+++ b/include/net/cfg802154.h
@@ -401,6 +401,10 @@ struct wpan_dev {
/* fallback for acknowledgment bit setting */
bool ackreq;
+
+ /* Coordinators management during scans */
+ spinlock_t coord_list_lock;
+ struct list_head coord_list;
};
#define to_phy(_dev) container_of(_dev, struct wpan_phy, dev)
@@ -451,4 +455,12 @@ static inline const char *wpan_phy_name(struct wpan_phy *phy)
void ieee802154_configure_durations(struct wpan_phy *phy);
+struct ieee802154_coord_desc *
+cfg802154_alloc_coordinator(struct ieee802154_addr *coord, gfp_t gfp);
+void cfg802154_free_coordinator_desc(struct ieee802154_coord_desc *desc);
+void cfg802154_record_coordinator(struct wpan_phy *wpan_phy,
+ struct wpan_dev *wpan_dev,
+ struct ieee802154_coord_desc *desc);
+void cfg802154_flush_known_coordinators(struct wpan_dev *wpan_dev);
+
#endif /* __NET_CFG802154_H */
diff --git a/net/ieee802154/Makefile b/net/ieee802154/Makefile
index f05b7bdae2aa..6b7c66de730d 100644
--- a/net/ieee802154/Makefile
+++ b/net/ieee802154/Makefile
@@ -4,7 +4,7 @@ obj-$(CONFIG_IEEE802154_SOCKET) += ieee802154_socket.o
obj-y += 6lowpan/
ieee802154-y := netlink.o nl-mac.o nl-phy.o nl_policy.o core.o \
- header_ops.o sysfs.o nl802154.o trace.o
+ header_ops.o sysfs.o nl802154.o pan.o trace.o
ieee802154_socket-y := socket.o
CFLAGS_trace.o := -I$(src)
diff --git a/net/ieee802154/core.c b/net/ieee802154/core.c
index 57546e07e06a..091eb467fde6 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++;
+ spin_lock_init(&wpan_dev->coord_list_lock);
+ INIT_LIST_HEAD(&wpan_dev->coord_list);
wpan_dev->netdev = dev;
break;
diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
index f6fb7a228747..b6bd04fe160b 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -1368,6 +1368,8 @@ static int nl802154_advertise_coordinator(struct wpan_phy *wpan_phy,
struct sk_buff *msg;
int ret;
+ lockdep_assert(&wpan_dev->coord_list_lock);
+
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
if (!msg)
return -ENOMEM;
diff --git a/net/ieee802154/pan.c b/net/ieee802154/pan.c
new file mode 100644
index 000000000000..0d4f752a090a
--- /dev/null
+++ b/net/ieee802154/pan.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * IEEE 802.15.4 PAN management
+ *
+ * Copyright (C) 2021 Qorvo US, Inc
+ * Authors:
+ * - David Girault <david.girault@xxxxxxxxx>
+ * - Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
+ */
+
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+
+#include <net/cfg802154.h>
+#include <net/af_ieee802154.h>
+
+#include "ieee802154.h"
+#include "../ieee802154/nl802154.h"
+
+struct ieee802154_coord_desc *
+cfg802154_alloc_coordinator(struct ieee802154_addr *coord, gfp_t gfp)
+{
+ struct ieee802154_coord_desc *desc;
+
+ desc = kzalloc(sizeof(*desc), gfp);
+ if (!desc)
+ return ERR_PTR(-ENOMEM);
+
+ desc->addr = kzalloc(sizeof(*coord), gfp);
+ if (!desc->addr) {
+ kfree(desc);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ memcpy(desc->addr, coord, sizeof(*coord));
+
+ return desc;
+}
+EXPORT_SYMBOL_GPL(cfg802154_alloc_coordinator);
+
+void cfg802154_free_coordinator_desc(struct ieee802154_coord_desc *desc)
+{
+ kfree(desc->addr);
+ kfree(desc);
+}
+EXPORT_SYMBOL_GPL(cfg802154_free_coordinator_desc);
+
+static bool
+cfg802154_is_same_coordinator(struct ieee802154_coord_desc *a,
+ struct ieee802154_coord_desc *b)
+{
+ if (a->addr->pan_id != b->addr->pan_id)
+ return false;
+
+ if (a->addr->mode != b->addr->mode)
+ return false;
+
+ if (a->addr->mode == IEEE802154_ADDR_SHORT &&
+ a->addr->short_addr == b->addr->short_addr)
+ return true;
+ else if (a->addr->mode == IEEE802154_ADDR_LONG &&
+ a->addr->extended_addr == b->addr->extended_addr)
+ return true;
+
+ return false;
+}
+
+static bool
+cfg802154_coordinator_is_known(struct wpan_dev *wpan_dev,
+ struct ieee802154_coord_desc *desc)
+{
+ struct ieee802154_coord_desc *item;
+
+ list_for_each_entry(item, &wpan_dev->coord_list, node)
+ if (cfg802154_is_same_coordinator(item, desc))
+ return true;
+
+ return false;
+}
+
+void cfg802154_record_coordinator(struct wpan_phy *wpan_phy,
+ struct wpan_dev *wpan_dev,
+ struct ieee802154_coord_desc *desc)
+{
+ spin_lock_bh(&wpan_dev->coord_list_lock);
+
+ if (cfg802154_coordinator_is_known(wpan_dev, desc)) {
+ nl802154_advertise_known_coordinator(wpan_phy, wpan_dev, desc);
+ cfg802154_free_coordinator_desc(desc);
+ } else {
+ list_add_tail(&desc->node, &wpan_dev->coord_list);
+ nl802154_advertise_new_coordinator(wpan_phy, wpan_dev, desc);
+ }
+
+ spin_unlock_bh(&wpan_dev->coord_list_lock);
+}
+EXPORT_SYMBOL_GPL(cfg802154_record_coordinator);
+
+void cfg802154_flush_known_coordinators(struct wpan_dev *wpan_dev)
+{
+ struct ieee802154_coord_desc *desc, *tmp;
+
+ spin_lock_bh(&wpan_dev->coord_list_lock);
+
+ list_for_each_entry_safe(desc, tmp, &wpan_dev->coord_list, node) {
+ list_del(&desc->node);
+ cfg802154_free_coordinator_desc(desc);
+ }
+
+ spin_unlock_bh(&wpan_dev->coord_list_lock);
+}
+EXPORT_SYMBOL_GPL(cfg802154_flush_known_coordinators);
--
2.34.1
