ieee802154: hwsim: add replacement for fakelb

This patch adds a new virtual driver mac802154_hwsim which is based on
the fakelb driver.
The fakelb driver will get deprecated and hopefully removed someday.
The main reason for doing this step is to rename the driver to
mac802154_hwsim to have a similar naming scheme as mac80211_hwsim,
which is more popular in the 802.11 wireless word and the idea is the
same behind this driver.

The new features of this driver are to have knowledge about connected
edges, which can be changed during runtime. This offers a testing
environment for routing protocols e.g. RPL.
The default behaviour is still as fakelb: two radios connected to each
other. New added radios during runtime will not be connected to other
wpan_hwsim instances.

The netlink api is not namespace aware on purpose, only the registered
wpan_phy's can be moved to namespaces. The physical layer according to
wiresless "air" communication can be handled across namespaces.

Furthermore the edges can be weighted with the LQI value according IEEE
802.15.4 which offers additional handling to mark bad or good connection
indicators to other connected virtual phys.
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>

drivers/net/ieee802154/Kconfig

@@ -115,3 +115,14 @@ config IEEE802154_MCR20A
 
 	  This driver can also be built as a module. To do so, say M here.
 	  the module will be called 'mcr20a'.
+
+config IEEE802154_HWSIM
+	depends on IEEE802154_DRIVERS && MAC802154
+	tristate "Simulated radio testing tool for mac802154"
+	---help---
+	  This driver is a developer testing tool that can be used to test
+	  IEEE 802.15.4 networking stack (mac802154) functionality. This is not
+	  needed for normal wpan usage and is only for testing.
+
+	  This driver can also be built as a module. To do so say M here.
+	  The module will be called 'mac802154_hwsim'.

drivers/net/ieee802154/Makefile

@@ -7,3 +7,4 @@ obj-$(CONFIG_IEEE802154_ATUSB) += atusb.o
 obj-$(CONFIG_IEEE802154_ADF7242) += adf7242.o
 obj-$(CONFIG_IEEE802154_CA8210) += ca8210.o
 obj-$(CONFIG_IEEE802154_MCR20A) += mcr20a.o
+obj-$(CONFIG_IEEE802154_HWSIM) += mac802154_hwsim.o

drivers/net/ieee802154/mac802154_hwsim.c

+/*
+ * HWSIM IEEE 802.15.4 interface
+ *
+ * (C) 2018 Mojatau, Alexander Aring <aring@mojatau.com>
+ * Copyright 2007-2012 Siemens AG
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * Based on fakelb, original Written by:
+ * Sergey Lapin <slapin@ossfans.org>
+ * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
+ * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
+ */
+
+#include <linux/module.h>
+#include <linux/timer.h>
+#include <linux/platform_device.h>
+#include <linux/netdevice.h>
+#include <linux/device.h>
+#include <linux/spinlock.h>
+#include <net/mac802154.h>
+#include <net/cfg802154.h>
+#include <net/genetlink.h>
+#include "mac802154_hwsim.h"
+
+MODULE_DESCRIPTION("Software simulator of IEEE 802.15.4 radio(s) for mac802154");
+MODULE_LICENSE("GPL");
+
+static LIST_HEAD(hwsim_phys);
+static DEFINE_MUTEX(hwsim_phys_lock);
+
+static __rcu LIST_HEAD(hwsim_ifup_phys);
+
+static struct platform_device *mac802154hwsim_dev;
+
+/* MAC802154_HWSIM netlink family */
+static struct genl_family hwsim_genl_family;
+
+static int hwsim_radio_idx;
+
+enum hwsim_multicast_groups {
+	HWSIM_MCGRP_CONFIG,
+};
+
+static const struct genl_multicast_group hwsim_mcgrps[] = {
+	[HWSIM_MCGRP_CONFIG] = { .name = "config", },
+};
+
+struct hwsim_pib {
+	u8 page;
+	u8 channel;
+
+	struct rcu_head rcu;
+};
+
+struct hwsim_edge_info {
+	u8 lqi;
+
+	struct rcu_head rcu;
+};
+
+struct hwsim_edge {
+	struct hwsim_phy *endpoint;
+	struct hwsim_edge_info *info;
+
+	struct list_head list;
+	struct rcu_head rcu;
+};
+
+struct hwsim_phy {
+	struct ieee802154_hw *hw;
+	u32 idx;
+
+	struct hwsim_pib __rcu *pib;
+
+	bool suspended;
+	struct list_head __rcu edges;
+
+	struct list_head list;
+	struct list_head list_ifup;
+};
+
+static int hwsim_add_one(struct genl_info *info, struct device *dev,
+			 bool init);
+static void hwsim_del(struct hwsim_phy *phy);
+
+static int hwsim_hw_ed(struct ieee802154_hw *hw, u8 *level)
+{
+	*level = 0xbe;
+
+	return 0;
+}
+
+static int hwsim_hw_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
+{
+	struct hwsim_phy *phy = hw->priv;
+	struct hwsim_pib *pib, *pib_old;
+
+	pib = kzalloc(sizeof(*pib), GFP_KERNEL);
+	if (!pib)
+		return -ENOMEM;
+
+	pib->page = page;
+	pib->channel = channel;
+
+	pib_old = phy->pib;
+	rcu_assign_pointer(phy->pib, pib);
+	kfree_rcu(pib_old, rcu);
+	return 0;
+}
+
+static int hwsim_hw_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
+{
+	struct hwsim_phy *current_phy = hw->priv;
+	struct hwsim_pib *current_pib, *endpoint_pib;
+	struct hwsim_edge_info *einfo;
+	struct hwsim_edge *e;
+
+	WARN_ON(current_phy->suspended);
+
+	rcu_read_lock();
+	current_pib = rcu_dereference(current_phy->pib);
+	list_for_each_entry_rcu(e, &current_phy->edges, list) {
+		/* Can be changed later in rx_irqsafe, but this is only a
+		 * performance tweak. Received radio should drop the frame
+		 * in mac802154 stack anyway... so we don't need to be
+		 * 100% of locking here to check on suspended
+		 */
+		if (e->endpoint->suspended)
+			continue;
+
+		endpoint_pib = rcu_dereference(e->endpoint->pib);
+		if (current_pib->page == endpoint_pib->page &&
+		    current_pib->channel == endpoint_pib->channel) {
+			struct sk_buff *newskb = pskb_copy(skb, GFP_ATOMIC);
+
+			einfo = rcu_dereference(e->info);
+			if (newskb)
+				ieee802154_rx_irqsafe(e->endpoint->hw, newskb,
+						      einfo->lqi);
+		}
+	}
+	rcu_read_unlock();
+
+	ieee802154_xmit_complete(hw, skb, false);
+	return 0;
+}
+
+static int hwsim_hw_start(struct ieee802154_hw *hw)
+{
+	struct hwsim_phy *phy = hw->priv;
+
+	phy->suspended = false;
+	list_add_rcu(&phy->list_ifup, &hwsim_ifup_phys);
+	synchronize_rcu();
+
+	return 0;
+}
+
+static void hwsim_hw_stop(struct ieee802154_hw *hw)
+{
+	struct hwsim_phy *phy = hw->priv;
+
+	phy->suspended = true;
+	list_del_rcu(&phy->list_ifup);
+	synchronize_rcu();
+}
+
+static int
+hwsim_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
+{
+	return 0;
+}
+
+static const struct ieee802154_ops hwsim_ops = {
+	.owner = THIS_MODULE,
+	.xmit_async = hwsim_hw_xmit,
+	.ed = hwsim_hw_ed,
+	.set_channel = hwsim_hw_channel,
+	.start = hwsim_hw_start,
+	.stop = hwsim_hw_stop,
+	.set_promiscuous_mode = hwsim_set_promiscuous_mode,
+};
+
+static int hwsim_new_radio_nl(struct sk_buff *msg, struct genl_info *info)
+{
+	return hwsim_add_one(info, &mac802154hwsim_dev->dev, false);
+}
+
+static int hwsim_del_radio_nl(struct sk_buff *msg, struct genl_info *info)
+{
+	struct hwsim_phy *phy, *tmp;
+	s64 idx = -1;
+
+	if (!info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID])
+		return -EINVAL;
+
+	idx = nla_get_u32(info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID]);
+
+	mutex_lock(&hwsim_phys_lock);
+	list_for_each_entry_safe(phy, tmp, &hwsim_phys, list) {
+		if (idx == phy->idx) {
+			hwsim_del(phy);
+			mutex_unlock(&hwsim_phys_lock);
+			return 0;
+		}
+	}
+	mutex_unlock(&hwsim_phys_lock);
+
+	return -ENODEV;
+}
+
+static int append_radio_msg(struct sk_buff *skb, struct hwsim_phy *phy)
+{
+	struct nlattr *nl_edges, *nl_edge;
+	struct hwsim_edge_info *einfo;
+	struct hwsim_edge *e;
+	int ret;
+
+	ret = nla_put_u32(skb, MAC802154_HWSIM_ATTR_RADIO_ID, phy->idx);
+	if (ret < 0)
+		return ret;
+
+	rcu_read_lock();
+	if (list_empty(&phy->edges)) {
+		rcu_read_unlock();
+		return 0;
+	}
+
+	nl_edges = nla_nest_start(skb, MAC802154_HWSIM_ATTR_RADIO_EDGES);
+	if (!nl_edges) {
+		rcu_read_unlock();
+		return -ENOBUFS;
+	}
+
+	list_for_each_entry_rcu(e, &phy->edges, list) {
+		nl_edge = nla_nest_start(skb, MAC802154_HWSIM_ATTR_RADIO_EDGE);
+		if (!nl_edge) {
+			rcu_read_unlock();
+			nla_nest_cancel(skb, nl_edges);
+			return -ENOBUFS;
+		}
+
+		ret = nla_put_u32(skb, MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID,
+				  e->endpoint->idx);
+		if (ret < 0) {
+			rcu_read_unlock();
+			nla_nest_cancel(skb, nl_edge);
+			nla_nest_cancel(skb, nl_edges);
+			return ret;
+		}
+
+		einfo = rcu_dereference(e->info);
+		ret = nla_put_u8(skb, MAC802154_HWSIM_EDGE_ATTR_LQI,
+				 einfo->lqi);
+		if (ret < 0) {
+			rcu_read_unlock();
+			nla_nest_cancel(skb, nl_edge);
+			nla_nest_cancel(skb, nl_edges);
+			return ret;
+		}
+
+		nla_nest_end(skb, nl_edge);
+	}
+	rcu_read_unlock();
+
+	nla_nest_end(skb, nl_edges);
+
+	return 0;
+}
+
+static int hwsim_get_radio(struct sk_buff *skb, struct hwsim_phy *phy,
+			   u32 portid, u32 seq,
+			   struct netlink_callback *cb, int flags)
+{
+	void *hdr;
+	int res = -EMSGSIZE;
+
+	hdr = genlmsg_put(skb, portid, seq, &hwsim_genl_family, flags,
+			  MAC802154_HWSIM_CMD_GET_RADIO);
+	if (!hdr)
+		return -EMSGSIZE;
+
+	if (cb)
+		genl_dump_check_consistent(cb, hdr);
+
+	res = append_radio_msg(skb, phy);
+	if (res < 0)
+		goto out_err;
+
+	genlmsg_end(skb, hdr);
+	return 0;
+
+out_err:
+	genlmsg_cancel(skb, hdr);
+	return res;
+}
+
+static int hwsim_get_radio_nl(struct sk_buff *msg, struct genl_info *info)
+{
+	struct hwsim_phy *phy;
+	struct sk_buff *skb;
+	int idx, res = -ENODEV;
+
+	if (!info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID])
+		return -EINVAL;
+	idx = nla_get_u32(info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID]);
+
+	mutex_lock(&hwsim_phys_lock);
+	list_for_each_entry(phy, &hwsim_phys, list) {
+		if (phy->idx != idx)
+			continue;
+
+		skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
+		if (!skb) {
+			res = -ENOMEM;
+			goto out_err;
+		}
+
+		res = hwsim_get_radio(skb, phy, info->snd_portid,
+				      info->snd_seq, NULL, 0);
+		if (res < 0) {
+			nlmsg_free(skb);
+			goto out_err;
+		}
+
+		genlmsg_reply(skb, info);
+		break;
+	}
+
+out_err:
+	mutex_unlock(&hwsim_phys_lock);
+
+	return res;
+}
+
+static int hwsim_dump_radio_nl(struct sk_buff *skb,
+			       struct netlink_callback *cb)
+{
+	int idx = cb->args[0];
+	struct hwsim_phy *phy;
+	int res;
+
+	mutex_lock(&hwsim_phys_lock);
+
+	if (idx == hwsim_radio_idx)
+		goto done;
+
+	list_for_each_entry(phy, &hwsim_phys, list) {
+		if (phy->idx < idx)
+			continue;
+
+		res = hwsim_get_radio(skb, phy, NETLINK_CB(cb->skb).portid,
+				      cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
+		if (res < 0)
+			break;
+
+		idx = phy->idx + 1;
+	}
+
+	cb->args[0] = idx;
+
+done:
+	mutex_unlock(&hwsim_phys_lock);
+	return skb->len;
+}
+
+/* caller need to held hwsim_phys_lock */
+static struct hwsim_phy *hwsim_get_radio_by_id(uint32_t idx)
+{
+	struct hwsim_phy *phy;
+
+	list_for_each_entry(phy, &hwsim_phys, list) {
+		if (phy->idx == idx)
+			return phy;
+	}
+
+	return NULL;
+}
+
+static const struct nla_policy hwsim_edge_policy[MAC802154_HWSIM_EDGE_ATTR_MAX + 1] = {
+	[MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID] = { .type = NLA_U32 },
+	[MAC802154_HWSIM_EDGE_ATTR_LQI] = { .type = NLA_U8 },
+};
+
+static struct hwsim_edge *hwsim_alloc_edge(struct hwsim_phy *endpoint, u8 lqi)
+{
+	struct hwsim_edge_info *einfo;
+	struct hwsim_edge *e;
+
+	e = kzalloc(sizeof(*e), GFP_KERNEL);
+	if (!e)
+		return NULL;
+
+	einfo = kzalloc(sizeof(*einfo), GFP_KERNEL);
+	if (!einfo) {
+		kfree(e);
+		return NULL;
+	}
+
+	einfo->lqi = 0xff;
+	e->info = einfo;
+	e->endpoint = endpoint;
+
+	return e;
+}
+
+static void hwsim_free_edge(struct hwsim_edge *e)
+{
+	kfree_rcu(e->info, rcu);
+	kfree_rcu(e, rcu);
+}
+
+static int hwsim_new_edge_nl(struct sk_buff *msg, struct genl_info *info)
+{
+	struct nlattr *edge_attrs[MAC802154_HWSIM_EDGE_ATTR_MAX + 1];
+	struct hwsim_phy *phy_v0, *phy_v1;
+	struct hwsim_edge *e;
+	u32 v0, v1;
+
+	if (!info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID] &&
+	    !info->attrs[MAC802154_HWSIM_ATTR_RADIO_EDGE])
+		return -EINVAL;
+
+	if (nla_parse_nested(edge_attrs, MAC802154_HWSIM_EDGE_ATTR_MAX,
+			     info->attrs[MAC802154_HWSIM_ATTR_RADIO_EDGE],
+			     hwsim_edge_policy, NULL))
+		return -EINVAL;
+
+	if (!edge_attrs[MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID])
+		return -EINVAL;
+
+	v0 = nla_get_u32(info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID]);
+	v1 = nla_get_u32(edge_attrs[MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID]);
+
+	if (v0 == v1)
+		return -EINVAL;
+
+	mutex_lock(&hwsim_phys_lock);
+	phy_v0 = hwsim_get_radio_by_id(v0);
+	if (!phy_v0) {
+		mutex_unlock(&hwsim_phys_lock);
+		return -ENOENT;
+	}
+
+	phy_v1 = hwsim_get_radio_by_id(v1);
+	if (!phy_v1) {
+		mutex_unlock(&hwsim_phys_lock);
+		return -ENOENT;
+	}
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(e, &phy_v0->edges, list) {
+		if (e->endpoint->idx == v1) {
+			mutex_unlock(&hwsim_phys_lock);
+			rcu_read_unlock();
+			return -EEXIST;
+		}
+	}
+	rcu_read_unlock();
+
+	e = hwsim_alloc_edge(phy_v1, 0xff);
+	if (!e) {
+		mutex_unlock(&hwsim_phys_lock);
+		return -ENOMEM;
+	}
+	list_add_rcu(&e->list, &phy_v0->edges);
+	/* wait until changes are done under hwsim_phys_lock lock
+	 * should prevent of calling this function twice while
+	 * edges list has not the changes yet.
+	 */
+	synchronize_rcu();
+	mutex_unlock(&hwsim_phys_lock);
+
+	return 0;
+}
+
+static int hwsim_del_edge_nl(struct sk_buff *msg, struct genl_info *info)
+{
+	struct nlattr *edge_attrs[MAC802154_HWSIM_EDGE_ATTR_MAX + 1];
+	struct hwsim_phy *phy_v0;
+	struct hwsim_edge *e;
+	u32 v0, v1;
+
+	if (!info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID] &&
+	    !info->attrs[MAC802154_HWSIM_ATTR_RADIO_EDGE])
+		return -EINVAL;
+
+	if (nla_parse_nested(edge_attrs, MAC802154_HWSIM_EDGE_ATTR_MAX + 1,
+			     info->attrs[MAC802154_HWSIM_ATTR_RADIO_EDGE],
+			     hwsim_edge_policy, NULL))
+		return -EINVAL;
+
+	if (!edge_attrs[MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID])
+		return -EINVAL;
+
+	v0 = nla_get_u32(info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID]);
+	v1 = nla_get_u32(edge_attrs[MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID]);
+
+	mutex_lock(&hwsim_phys_lock);
+	phy_v0 = hwsim_get_radio_by_id(v0);
+	if (!phy_v0) {
+		mutex_unlock(&hwsim_phys_lock);
+		return -ENOENT;
+	}
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(e, &phy_v0->edges, list) {
+		if (e->endpoint->idx == v1) {
+			rcu_read_unlock();
+			list_del_rcu(&e->list);
+			hwsim_free_edge(e);
+			/* same again - wait until list changes are done */
+			synchronize_rcu();
+			mutex_unlock(&hwsim_phys_lock);
+			return 0;
+		}
+	}
+	rcu_read_unlock();
+
+	mutex_unlock(&hwsim_phys_lock);
+
+	return -ENOENT;
+}
+
+static int hwsim_set_edge_lqi(struct sk_buff *msg, struct genl_info *info)
+{
+	struct nlattr *edge_attrs[MAC802154_HWSIM_EDGE_ATTR_MAX + 1];
+	struct hwsim_edge_info *einfo;
+	struct hwsim_phy *phy_v0;
+	struct hwsim_edge *e;
+	u32 v0, v1;
+	u8 lqi;
+
+	if (!info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID] &&
+	    !info->attrs[MAC802154_HWSIM_ATTR_RADIO_EDGE])
+		return -EINVAL;
+
+	if (nla_parse_nested(edge_attrs, MAC802154_HWSIM_EDGE_ATTR_MAX + 1,
+			     info->attrs[MAC802154_HWSIM_ATTR_RADIO_EDGE],
+			     hwsim_edge_policy, NULL))
+		return -EINVAL;
+
+	if (!edge_attrs[MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID] &&
+	    !edge_attrs[MAC802154_HWSIM_EDGE_ATTR_LQI])
+		return -EINVAL;
+
+	v0 = nla_get_u32(info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID]);
+	v1 = nla_get_u32(edge_attrs[MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID]);
+	lqi = nla_get_u8(edge_attrs[MAC802154_HWSIM_EDGE_ATTR_LQI]);
+
+	mutex_lock(&hwsim_phys_lock);
+	phy_v0 = hwsim_get_radio_by_id(v0);
+	if (!phy_v0) {
+		mutex_unlock(&hwsim_phys_lock);
+		return -ENOENT;
+	}
+
+	einfo = kzalloc(sizeof(*einfo), GFP_KERNEL);
+	if (!info) {
+		mutex_unlock(&hwsim_phys_lock);
+		return -ENOMEM;
+	}
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(e, &phy_v0->edges, list) {
+		if (e->endpoint->idx == v1) {
+			einfo->lqi = lqi;
+			rcu_assign_pointer(e->info, einfo);
+			rcu_read_unlock();
+			mutex_unlock(&hwsim_phys_lock);
+			return 0;
+		}
+	}
+	rcu_read_unlock();
+
+	kfree(einfo);
+	mutex_unlock(&hwsim_phys_lock);
+
+	return -ENOENT;
+}
+
+/* MAC802154_HWSIM netlink policy */
+
+static const struct nla_policy hwsim_genl_policy[MAC802154_HWSIM_ATTR_MAX + 1] = {
+	[MAC802154_HWSIM_ATTR_RADIO_ID] = { .type = NLA_U32 },
+	[MAC802154_HWSIM_ATTR_RADIO_EDGE] = { .type = NLA_NESTED },
+	[MAC802154_HWSIM_ATTR_RADIO_EDGES] = { .type = NLA_NESTED },
+};
+
+/* Generic Netlink operations array */
+static const struct genl_ops hwsim_nl_ops[] = {
+	{
+		.cmd = MAC802154_HWSIM_CMD_NEW_RADIO,
+		.policy = hwsim_genl_policy,
+		.doit = hwsim_new_radio_nl,
+		.flags = GENL_UNS_ADMIN_PERM,
+	},
+	{
+		.cmd = MAC802154_HWSIM_CMD_DEL_RADIO,
+		.policy = hwsim_genl_policy,
+		.doit = hwsim_del_radio_nl,
+		.flags = GENL_UNS_ADMIN_PERM,
+	},
+	{
+		.cmd = MAC802154_HWSIM_CMD_GET_RADIO,
+		.policy = hwsim_genl_policy,
+		.doit = hwsim_get_radio_nl,
+		.dumpit = hwsim_dump_radio_nl,
+	},
+	{
+		.cmd = MAC802154_HWSIM_CMD_NEW_EDGE,
+		.policy = hwsim_genl_policy,
+		.doit = hwsim_new_edge_nl,
+		.flags = GENL_UNS_ADMIN_PERM,
+	},
+	{
+		.cmd = MAC802154_HWSIM_CMD_DEL_EDGE,
+		.policy = hwsim_genl_policy,
+		.doit = hwsim_del_edge_nl,
+		.flags = GENL_UNS_ADMIN_PERM,
+	},
+	{
+		.cmd = MAC802154_HWSIM_CMD_SET_EDGE,
+		.policy = hwsim_genl_policy,
+		.doit = hwsim_set_edge_lqi,
+		.flags = GENL_UNS_ADMIN_PERM,
+	},
+};
+
+static struct genl_family hwsim_genl_family __ro_after_init = {
+	.name = "MAC802154_HWSIM",
+	.version = 1,
+	.maxattr = MAC802154_HWSIM_ATTR_MAX,
+	.module = THIS_MODULE,
+	.ops = hwsim_nl_ops,
+	.n_ops = ARRAY_SIZE(hwsim_nl_ops),
+	.mcgrps = hwsim_mcgrps,
+	.n_mcgrps = ARRAY_SIZE(hwsim_mcgrps),
+};
+
+static void hwsim_mcast_config_msg(struct sk_buff *mcast_skb,
+				   struct genl_info *info)
+{
+	if (info)
+		genl_notify(&hwsim_genl_family, mcast_skb, info,
+			    HWSIM_MCGRP_CONFIG, GFP_KERNEL);
+	else
+		genlmsg_multicast(&hwsim_genl_family, mcast_skb, 0,
+				  HWSIM_MCGRP_CONFIG, GFP_KERNEL);
+}
+
+static void hwsim_mcast_new_radio(struct genl_info *info, struct hwsim_phy *phy)
+{
+	struct sk_buff *mcast_skb;
+	void *data;
+
+	mcast_skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!mcast_skb)
+		return;
+
+	data = genlmsg_put(mcast_skb, 0, 0, &hwsim_genl_family, 0,
+			   MAC802154_HWSIM_CMD_NEW_RADIO);
+	if (!data)
+		goto out_err;
+
+	if (append_radio_msg(mcast_skb, phy) < 0)
+		goto out_err;
+
+	genlmsg_end(mcast_skb, data);
+
+	hwsim_mcast_config_msg(mcast_skb, info);
+	return;
+
+out_err:
+	genlmsg_cancel(mcast_skb, data);
+	nlmsg_free(mcast_skb);
+}
+
+static void hwsim_edge_unsubscribe_me(struct hwsim_phy *phy)
+{
+	struct hwsim_phy *tmp;
+	struct hwsim_edge *e;
+
+	rcu_read_lock();
+	/* going to all phy edges and remove phy from it */
+	list_for_each_entry(tmp, &hwsim_phys, list) {
+		list_for_each_entry_rcu(e, &tmp->edges, list) {
+			if (e->endpoint->idx == phy->idx) {
+				list_del_rcu(&e->list);
+				hwsim_free_edge(e);
+			}
+		}
+	}
+	rcu_read_unlock();
+
+	synchronize_rcu();
+}
+
+static int hwsim_subscribe_all_others(struct hwsim_phy *phy)
+{
+	struct hwsim_phy *sub;
+	struct hwsim_edge *e;
+
+	list_for_each_entry(sub, &hwsim_phys, list) {
+		e = hwsim_alloc_edge(sub, 0xff);
+		if (!e)
+			goto me_fail;
+
+		list_add_rcu(&e->list, &phy->edges);
+	}
+
+	list_for_each_entry(sub, &hwsim_phys, list) {
+		e = hwsim_alloc_edge(phy, 0xff);
+		if (!e)
+			goto sub_fail;
+
+		list_add_rcu(&e->list, &sub->edges);
+	}
+
+	return 0;
+
+me_fail:
+	list_for_each_entry(phy, &hwsim_phys, list) {
+		list_del_rcu(&e->list);
+		hwsim_free_edge(e);
+	}
+sub_fail:
+	hwsim_edge_unsubscribe_me(phy);
+	return -ENOMEM;
+}
+
+static int hwsim_add_one(struct genl_info *info, struct device *dev,
+			 bool init)
+{
+	struct ieee802154_hw *hw;
+	struct hwsim_phy *phy;
+	struct hwsim_pib *pib;
+	int idx;
+	int err;
+
+	idx = hwsim_radio_idx++;
+
+	hw = ieee802154_alloc_hw(sizeof(*phy), &hwsim_ops);
+	if (!hw)
+		return -ENOMEM;
+
+	phy = hw->priv;
+	phy->hw = hw;
+
+	/* 868 MHz BPSK	802.15.4-2003 */
+	hw->phy->supported.channels[0] |= 1;
+	/* 915 MHz BPSK	802.15.4-2003 */
+	hw->phy->supported.channels[0] |= 0x7fe;
+	/* 2.4 GHz O-QPSK 802.15.4-2003 */
+	hw->phy->supported.channels[0] |= 0x7FFF800;
+	/* 868 MHz ASK 802.15.4-2006 */
+	hw->phy->supported.channels[1] |= 1;
+	/* 915 MHz ASK 802.15.4-2006 */
+	hw->phy->supported.channels[1] |= 0x7fe;
+	/* 868 MHz O-QPSK 802.15.4-2006 */
+	hw->phy->supported.channels[2] |= 1;
+	/* 915 MHz O-QPSK 802.15.4-2006 */
+	hw->phy->supported.channels[2] |= 0x7fe;
+	/* 2.4 GHz CSS 802.15.4a-2007 */
+	hw->phy->supported.channels[3] |= 0x3fff;
+	/* UWB Sub-gigahertz 802.15.4a-2007 */
+	hw->phy->supported.channels[4] |= 1;
+	/* UWB Low band 802.15.4a-2007 */
+	hw->phy->supported.channels[4] |= 0x1e;
+	/* UWB High band 802.15.4a-2007 */
+	hw->phy->supported.channels[4] |= 0xffe0;
+	/* 750 MHz O-QPSK 802.15.4c-2009 */
+	hw->phy->supported.channels[5] |= 0xf;
+	/* 750 MHz MPSK 802.15.4c-2009 */
+	hw->phy->supported.channels[5] |= 0xf0;
+	/* 950 MHz BPSK 802.15.4d-2009 */
+	hw->phy->supported.channels[6] |= 0x3ff;
+	/* 950 MHz GFSK 802.15.4d-2009 */
+	hw->phy->supported.channels[6] |= 0x3ffc00;
+
+	ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
+
+	/* hwsim phy channel 13 as default */
+	hw->phy->current_channel = 13;
+	pib = kzalloc(sizeof(*pib), GFP_KERNEL);
+	if (!pib) {
+		err = -ENOMEM;
+		goto err_pib;
+	}
+
+	phy->pib = pib;
+	phy->idx = idx;
+	INIT_LIST_HEAD(&phy->edges);
+
+	hw->flags = IEEE802154_HW_PROMISCUOUS;
+	hw->parent = dev;
+
+	err = ieee802154_register_hw(hw);
+	if (err)
+		goto err_reg;
+
+	mutex_lock(&hwsim_phys_lock);
+	if (init) {
+		err = hwsim_subscribe_all_others(phy);
+		if (err < 0)
+			goto err_reg;
+	}
+	list_add_tail(&phy->list, &hwsim_phys);
+	mutex_unlock(&hwsim_phys_lock);
+
+	hwsim_mcast_new_radio(info, phy);
+
+	return idx;
+
+err_reg:
+	kfree(pib);
+err_pib:
+	ieee802154_free_hw(phy->hw);
+	return err;
+}
+
+static void hwsim_del(struct hwsim_phy *phy)
+{
+	hwsim_edge_unsubscribe_me(phy);
+
+	list_del(&phy->list);
+	kfree_rcu(phy->pib, rcu);
+
+	ieee802154_unregister_hw(phy->hw);
+	ieee802154_free_hw(phy->hw);
+}
+
+static int hwsim_probe(struct platform_device *pdev)
+{
+	struct hwsim_phy *phy, *tmp;
+	int err, i;
+
+	for (i = 0; i < 2; i++) {
+		err = hwsim_add_one(NULL, &pdev->dev, true);
+		if (err < 0)
+			goto err_slave;
+	}
+
+	dev_info(&pdev->dev, "Added 2 mac802154 hwsim hardware radios\n");
+	return 0;
+
+err_slave:
+	mutex_lock(&hwsim_phys_lock);
+	list_for_each_entry_safe(phy, tmp, &hwsim_phys, list)
+		hwsim_del(phy);
+	mutex_unlock(&hwsim_phys_lock);
+	return err;
+}
+
+static int hwsim_remove(struct platform_device *pdev)
+{
+	struct hwsim_phy *phy, *tmp;
+
+	mutex_lock(&hwsim_phys_lock);
+	list_for_each_entry_safe(phy, tmp, &hwsim_phys, list)
+		hwsim_del(phy);
+	mutex_unlock(&hwsim_phys_lock);
+
+	return 0;
+}
+
+static struct platform_driver mac802154hwsim_driver = {
+	.probe = hwsim_probe,
+	.remove = hwsim_remove,
+	.driver = {
+			.name = "mac802154_hwsim",
+	},
+};
+
+static __init int hwsim_init_module(void)
+{
+	int rc;
+
+	rc = genl_register_family(&hwsim_genl_family);
+	if (rc)
+		return rc;
+
+	mac802154hwsim_dev = platform_device_register_simple("mac802154_hwsim",
+							     -1, NULL, 0);
+	if (IS_ERR(mac802154hwsim_dev)) {
+		rc = PTR_ERR(mac802154hwsim_dev);
+		goto platform_dev;
+	}
+
+	rc = platform_driver_register(&mac802154hwsim_driver);
+	if (rc < 0)
+		goto platform_drv;
+
+	return 0;
+
+platform_drv:
+	genl_unregister_family(&hwsim_genl_family);
+platform_dev:
+	platform_device_unregister(mac802154hwsim_dev);
+	return rc;
+}
+
+static __exit void hwsim_remove_module(void)
+{
+	genl_unregister_family(&hwsim_genl_family);
+	platform_driver_unregister(&mac802154hwsim_driver);
+	platform_device_unregister(mac802154hwsim_dev);
+}
+
+module_init(hwsim_init_module);
+module_exit(hwsim_remove_module);

drivers/net/ieee802154/mac802154_hwsim.h

+#ifndef __MAC802154_HWSIM_H
+#define __MAC802154_HWSIM_H
+
+/* mac802154 hwsim netlink commands
+ *
+ * @MAC802154_HWSIM_CMD_UNSPEC: unspecified command to catch error
+ * @MAC802154_HWSIM_CMD_GET_RADIO: fetch information about existing radios
+ * @MAC802154_HWSIM_CMD_SET_RADIO: change radio parameters during runtime
+ * @MAC802154_HWSIM_CMD_NEW_RADIO: create a new radio with the given parameters
+ *	returns the radio ID (>= 0) or negative on errors, if successful
+ *	then multicast the result
+ * @MAC802154_HWSIM_CMD_DEL_RADIO: destroy a radio, reply is multicasted
+ * @MAC802154_HWSIM_CMD_GET_EDGE: fetch information about existing edges
+ * @MAC802154_HWSIM_CMD_SET_EDGE: change edge parameters during runtime
+ * @MAC802154_HWSIM_CMD_DEL_EDGE: delete edges between radios
+ * @MAC802154_HWSIM_CMD_NEW_EDGE: create a new edge between two radios
+ * @__MAC802154_HWSIM_CMD_MAX: enum limit
+ */
+enum {
+	MAC802154_HWSIM_CMD_UNSPEC,
+
+	MAC802154_HWSIM_CMD_GET_RADIO,
+	MAC802154_HWSIM_CMD_SET_RADIO,
+	MAC802154_HWSIM_CMD_NEW_RADIO,
+	MAC802154_HWSIM_CMD_DEL_RADIO,
+
+	MAC802154_HWSIM_CMD_GET_EDGE,
+	MAC802154_HWSIM_CMD_SET_EDGE,
+	MAC802154_HWSIM_CMD_DEL_EDGE,
+	MAC802154_HWSIM_CMD_NEW_EDGE,
+
+	__MAC802154_HWSIM_CMD_MAX,
+};
+
+#define MAC802154_HWSIM_CMD_MAX (__MAC802154_HWSIM_MAX - 1)
+
+/* mac802154 hwsim netlink attributes
+ *
+ * @MAC802154_HWSIM_ATTR_UNSPEC: unspecified attribute to catch error
+ * @MAC802154_HWSIM_ATTR_RADIO_ID: u32 attribute to identify the radio
+ * @MAC802154_HWSIM_ATTR_EDGE: nested attribute of edges
+ * @MAC802154_HWSIM_ATTR_EDGES: list if nested attributes which contains the
+ *	edge information according the radio id
+ * @__MAC802154_HWSIM_ATTR_MAX: enum limit
+ */
+enum {
+	MAC802154_HWSIM_ATTR_UNSPEC,
+	MAC802154_HWSIM_ATTR_RADIO_ID,
+	MAC802154_HWSIM_ATTR_RADIO_EDGE,
+	MAC802154_HWSIM_ATTR_RADIO_EDGES,
+	__MAC802154_HWSIM_ATTR_MAX,
+};
+
+#define MAC802154_HWSIM_ATTR_MAX (__MAC802154_HWSIM_ATTR_MAX - 1)
+
+/* mac802154 hwsim edge netlink attributes
+ *
+ * @MAC802154_HWSIM_EDGE_ATTR_UNSPEC: unspecified attribute to catch error
+ * @MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID: radio id where the edge points to
+ * @MAC802154_HWSIM_EDGE_ATTR_LQI: LQI value which the endpoint radio will
+ *	receive for this edge
+ * @__MAC802154_HWSIM_ATTR_MAX: enum limit
+ */
+enum {
+	MAC802154_HWSIM_EDGE_ATTR_UNSPEC,
+	MAC802154_HWSIM_EDGE_ATTR_ENDPOINT_ID,
+	MAC802154_HWSIM_EDGE_ATTR_LQI,
+	__MAC802154_HWSIM_EDGE_ATTR_MAX,
+};
+
+#define MAC802154_HWSIM_EDGE_ATTR_MAX (__MAC802154_HWSIM_EDGE_ATTR_MAX - 1)
+
+#endif /* __MAC802154_HWSIM_H */