drivers/net/ieee802154/fakelb.c

   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
  22 static int numlbs = 2;
  23
  24 static LIST_HEAD(fakelb_phys);
  25 static DEFINE_MUTEX(fakelb_phys_lock);
  26
  27 static LIST_HEAD(fakelb_ifup_phys);
  28 static DEFINE_RWLOCK(fakelb_ifup_phys_lock);
  29
  30 struct 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
  42 static int fakelb_hw_ed(struct ieee802154_hw *hw, u8 *level)
  43 {
  44         WARN_ON(!level);
  45         *level = 0xbe;
  46
  47         return 0;
  48 }
  49
  50 static 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
  61 static 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
  85 static 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
  97 static 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
 107 static int
 108 fakelb_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
 109 {
 110         return 0;
 111 }
 112
 113 static 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. */
 124 module_param(numlbs, int, 0);
 125 MODULE_PARM_DESC(numlbs, " number of pseudo devices");
 126
 127 static 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
 189 err_reg:
 190         ieee802154_free_hw(phy->hw);
 191         return err;
 192 }
 193
 194 static 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
 202 static 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
 216 err_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
 224 static 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
 234 static struct platform_device *ieee802154fake_dev;
 235
 236 static struct platform_driver ieee802154fake_driver = {
 237         .probe = fakelb_probe,
 238         .remove_new = fakelb_remove,
 239         .driver = {
 240                         .name = "ieee802154fakelb",
 241         },
 242 };
 243
 244 static __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
 254 static __exit void fake_remove_module(void)
 255 {
 256         platform_driver_unregister(&ieee802154fake_driver);
 257         platform_device_unregister(ieee802154fake_dev);
 258 }
 259
 260 module_init(fakelb_init_module);
 261 module_exit(fake_remove_module);
 262 MODULE_DESCRIPTION("IEEE 802.15.4 loopback driver");
 263 MODULE_LICENSE("GPL");