1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Loopback IEEE 802.15.4 interface
  4 *
  5 * Copyright 2007-2012 Siemens AG
  6 *
  7 * Written by:
  8 * Sergey Lapin <slapin@ossfans.org>
  9 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
 10 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
 11 */
 12
 13#include <linux/module.h>
 14#include <linux/timer.h>
 15#include <linux/platform_device.h>
 16#include <linux/netdevice.h>
 17#include <linux/device.h>
 18#include <linux/spinlock.h>
 19#include <net/mac802154.h>
 20#include <net/cfg802154.h>
 21
 22static int numlbs = 2;
 23
 24static LIST_HEAD(fakelb_phys);
 25static DEFINE_MUTEX(fakelb_phys_lock);
 26
 27static LIST_HEAD(fakelb_ifup_phys);
 28static DEFINE_RWLOCK(fakelb_ifup_phys_lock);
 29
 30struct fakelb_phy {
 31	struct ieee802154_hw *hw;
 32
 33	u8 page;
 34	u8 channel;
 35
 36	bool suspended;
 37
 38	struct list_head list;
 39	struct list_head list_ifup;
 40};
 41
 42static int fakelb_hw_ed(struct ieee802154_hw *hw, u8 *level)
 43{
 44	WARN_ON(!level);
 45	*level = 0xbe;
 46
 47	return 0;
 48}
 49
 50static int fakelb_hw_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
 51{
 52	struct fakelb_phy *phy = hw->priv;
 53
 54	write_lock_bh(&fakelb_ifup_phys_lock);
 55	phy->page = page;
 56	phy->channel = channel;
 57	write_unlock_bh(&fakelb_ifup_phys_lock);
 58	return 0;
 59}
 60
 61static int fakelb_hw_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
 62{
 63	struct fakelb_phy *current_phy = hw->priv, *phy;
 64
 65	read_lock_bh(&fakelb_ifup_phys_lock);
 66	WARN_ON(current_phy->suspended);
 67	list_for_each_entry(phy, &fakelb_ifup_phys, list_ifup) {
 68		if (current_phy == phy)
 69			continue;
 70
 71		if (current_phy->page == phy->page &&
 72		    current_phy->channel == phy->channel) {
 73			struct sk_buff *newskb = pskb_copy(skb, GFP_ATOMIC);
 74
 75			if (newskb)
 76				ieee802154_rx_irqsafe(phy->hw, newskb, 0xcc);
 77		}
 78	}
 79	read_unlock_bh(&fakelb_ifup_phys_lock);
 80
 81	ieee802154_xmit_complete(hw, skb, false);
 82	return 0;
 83}
 84
 85static int fakelb_hw_start(struct ieee802154_hw *hw)
 86{
 87	struct fakelb_phy *phy = hw->priv;
 88
 89	write_lock_bh(&fakelb_ifup_phys_lock);
 90	phy->suspended = false;
 91	list_add(&phy->list_ifup, &fakelb_ifup_phys);
 92	write_unlock_bh(&fakelb_ifup_phys_lock);
 93
 94	return 0;
 95}
 96
 97static void fakelb_hw_stop(struct ieee802154_hw *hw)
 98{
 99	struct fakelb_phy *phy = hw->priv;
100
101	write_lock_bh(&fakelb_ifup_phys_lock);
102	phy->suspended = true;
103	list_del(&phy->list_ifup);
104	write_unlock_bh(&fakelb_ifup_phys_lock);
105}
106
107static int
108fakelb_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
109{
110	return 0;
111}
112
113static const struct ieee802154_ops fakelb_ops = {
114	.owner = THIS_MODULE,
115	.xmit_async = fakelb_hw_xmit,
116	.ed = fakelb_hw_ed,
117	.set_channel = fakelb_hw_channel,
118	.start = fakelb_hw_start,
119	.stop = fakelb_hw_stop,
120	.set_promiscuous_mode = fakelb_set_promiscuous_mode,
121};
122
123/* Number of dummy devices to be set up by this module. */
124module_param(numlbs, int, 0);
125MODULE_PARM_DESC(numlbs, " number of pseudo devices");
126
127static int fakelb_add_one(struct device *dev)
128{
129	struct ieee802154_hw *hw;
130	struct fakelb_phy *phy;
131	int err;
132
133	hw = ieee802154_alloc_hw(sizeof(*phy), &fakelb_ops);
134	if (!hw)
135		return -ENOMEM;
136
137	phy = hw->priv;
138	phy->hw = hw;
139
140	/* 868 MHz BPSK	802.15.4-2003 */
141	hw->phy->supported.channels[0] |= 1;
142	/* 915 MHz BPSK	802.15.4-2003 */
143	hw->phy->supported.channels[0] |= 0x7fe;
144	/* 2.4 GHz O-QPSK 802.15.4-2003 */
145	hw->phy->supported.channels[0] |= 0x7FFF800;
146	/* 868 MHz ASK 802.15.4-2006 */
147	hw->phy->supported.channels[1] |= 1;
148	/* 915 MHz ASK 802.15.4-2006 */
149	hw->phy->supported.channels[1] |= 0x7fe;
150	/* 868 MHz O-QPSK 802.15.4-2006 */
151	hw->phy->supported.channels[2] |= 1;
152	/* 915 MHz O-QPSK 802.15.4-2006 */
153	hw->phy->supported.channels[2] |= 0x7fe;
154	/* 2.4 GHz CSS 802.15.4a-2007 */
155	hw->phy->supported.channels[3] |= 0x3fff;
156	/* UWB Sub-gigahertz 802.15.4a-2007 */
157	hw->phy->supported.channels[4] |= 1;
158	/* UWB Low band 802.15.4a-2007 */
159	hw->phy->supported.channels[4] |= 0x1e;
160	/* UWB High band 802.15.4a-2007 */
161	hw->phy->supported.channels[4] |= 0xffe0;
162	/* 750 MHz O-QPSK 802.15.4c-2009 */
163	hw->phy->supported.channels[5] |= 0xf;
164	/* 750 MHz MPSK 802.15.4c-2009 */
165	hw->phy->supported.channels[5] |= 0xf0;
166	/* 950 MHz BPSK 802.15.4d-2009 */
167	hw->phy->supported.channels[6] |= 0x3ff;
168	/* 950 MHz GFSK 802.15.4d-2009 */
169	hw->phy->supported.channels[6] |= 0x3ffc00;
170
171	ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
172	/* fake phy channel 13 as default */
173	hw->phy->current_channel = 13;
174	phy->channel = hw->phy->current_channel;
175
176	hw->flags = IEEE802154_HW_PROMISCUOUS;
177	hw->parent = dev;
178
179	err = ieee802154_register_hw(hw);
180	if (err)
181		goto err_reg;
182
183	mutex_lock(&fakelb_phys_lock);
184	list_add_tail(&phy->list, &fakelb_phys);
185	mutex_unlock(&fakelb_phys_lock);
186
187	return 0;
188
189err_reg:
190	ieee802154_free_hw(phy->hw);
191	return err;
192}
193
194static void fakelb_del(struct fakelb_phy *phy)
195{
196	list_del(&phy->list);
197
198	ieee802154_unregister_hw(phy->hw);
199	ieee802154_free_hw(phy->hw);
200}
201
202static int fakelb_probe(struct platform_device *pdev)
203{
204	struct fakelb_phy *phy, *tmp;
205	int err, i;
206
207	for (i = 0; i < numlbs; i++) {
208		err = fakelb_add_one(&pdev->dev);
209		if (err < 0)
210			goto err_slave;
211	}
212
213	dev_info(&pdev->dev, "added %i fake ieee802154 hardware devices\n", numlbs);
214	return 0;
215
216err_slave:
217	mutex_lock(&fakelb_phys_lock);
218	list_for_each_entry_safe(phy, tmp, &fakelb_phys, list)
219		fakelb_del(phy);
220	mutex_unlock(&fakelb_phys_lock);
221	return err;
222}
223
224static void fakelb_remove(struct platform_device *pdev)
225{
226	struct fakelb_phy *phy, *tmp;
227
228	mutex_lock(&fakelb_phys_lock);
229	list_for_each_entry_safe(phy, tmp, &fakelb_phys, list)
230		fakelb_del(phy);
231	mutex_unlock(&fakelb_phys_lock);
232}
233
234static struct platform_device *ieee802154fake_dev;
235
236static struct platform_driver ieee802154fake_driver = {
237	.probe = fakelb_probe,
238	.remove = fakelb_remove,
239	.driver = {
240			.name = "ieee802154fakelb",
241	},
242};
243
244static __init int fakelb_init_module(void)
245{
246	ieee802154fake_dev = platform_device_register_simple(
247			     "ieee802154fakelb", -1, NULL, 0);
248
249	pr_warn("fakelb driver is marked as deprecated, please use mac802154_hwsim!\n");
250
251	return platform_driver_register(&ieee802154fake_driver);
252}
253
254static __exit void fake_remove_module(void)
255{
256	platform_driver_unregister(&ieee802154fake_driver);
257	platform_device_unregister(ieee802154fake_dev);
258}
259
260module_init(fakelb_init_module);
261module_exit(fake_remove_module);
262MODULE_DESCRIPTION("IEEE 802.15.4 loopback driver");
263MODULE_LICENSE("GPL");