net/mac802154/iface.c

   1 /*
   2  * Copyright 2007-2012 Siemens AG
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * Written by:
  14  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  15  * Sergey Lapin <slapin@ossfans.org>
  16  * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
  17  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
  18  */
  19
  20 #include <linux/netdevice.h>
  21 #include <linux/module.h>
  22 #include <linux/if_arp.h>
  23 #include <linux/ieee802154.h>
  24
  25 #include <net/nl802154.h>
  26 #include <net/mac802154.h>
  27 #include <net/ieee802154_netdev.h>
  28 #include <net/cfg802154.h>
  29
  30 #include "ieee802154_i.h"
  31 #include "driver-ops.h"
  32
  33 static int mac802154_wpan_update_llsec(struct net_device *dev)
  34 {
  35         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  36         struct ieee802154_mlme_ops *ops = ieee802154_mlme_ops(dev);
  37         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
  38         int rc = 0;
  39
  40         if (ops->llsec) {
  41                 struct ieee802154_llsec_params params;
  42                 int changed = 0;
  43
  44                 params.pan_id = wpan_dev->pan_id;
  45                 changed |= IEEE802154_LLSEC_PARAM_PAN_ID;
  46
  47                 params.hwaddr = wpan_dev->extended_addr;
  48                 changed |= IEEE802154_LLSEC_PARAM_HWADDR;
  49
  50                 rc = ops->llsec->set_params(dev, &params, changed);
  51         }
  52
  53         return rc;
  54 }
  55
  56 static int
  57 mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
  58 {
  59         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  60         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
  61         struct sockaddr_ieee802154 *sa =
  62                 (struct sockaddr_ieee802154 *)&ifr->ifr_addr;
  63         int err = -ENOIOCTLCMD;
  64
  65         ASSERT_RTNL();
  66
  67         spin_lock_bh(&sdata->mib_lock);
  68
  69         switch (cmd) {
  70         case SIOCGIFADDR:
  71         {
  72                 u16 pan_id, short_addr;
  73
  74                 pan_id = le16_to_cpu(wpan_dev->pan_id);
  75                 short_addr = le16_to_cpu(wpan_dev->short_addr);
  76                 if (pan_id == IEEE802154_PANID_BROADCAST ||
  77                     short_addr == IEEE802154_ADDR_BROADCAST) {
  78                         err = -EADDRNOTAVAIL;
  79                         break;
  80                 }
  81
  82                 sa->family = AF_IEEE802154;
  83                 sa->addr.addr_type = IEEE802154_ADDR_SHORT;
  84                 sa->addr.pan_id = pan_id;
  85                 sa->addr.short_addr = short_addr;
  86
  87                 err = 0;
  88                 break;
  89         }
  90         case SIOCSIFADDR:
  91                 if (netif_running(dev)) {
  92                         spin_unlock_bh(&sdata->mib_lock);
  93                         return -EBUSY;
  94                 }
  95
  96                 dev_warn(&dev->dev,
  97                          "Using DEBUGing ioctl SIOCSIFADDR isn't recommended!\n");
  98                 if (sa->family != AF_IEEE802154 ||
  99                     sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
 100                     sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
 101                     sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
 102                     sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
 103                         err = -EINVAL;
 104                         break;
 105                 }
 106
 107                 wpan_dev->pan_id = cpu_to_le16(sa->addr.pan_id);
 108                 wpan_dev->short_addr = cpu_to_le16(sa->addr.short_addr);
 109
 110                 err = mac802154_wpan_update_llsec(dev);
 111                 break;
 112         }
 113
 114         spin_unlock_bh(&sdata->mib_lock);
 115         return err;
 116 }
 117
 118 static int mac802154_wpan_mac_addr(struct net_device *dev, void *p)
 119 {
 120         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 121         struct sockaddr *addr = p;
 122         __le64 extended_addr;
 123
 124         if (netif_running(dev))
 125                 return -EBUSY;
 126
 127         ieee802154_be64_to_le64(&extended_addr, addr->sa_data);
 128         if (!ieee802154_is_valid_extended_addr(extended_addr))
 129                 return -EINVAL;
 130
 131         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 132         sdata->wpan_dev.extended_addr = extended_addr;
 133
 134         return mac802154_wpan_update_llsec(dev);
 135 }
 136
 137 static int mac802154_slave_open(struct net_device *dev)
 138 {
 139         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 140         struct ieee802154_sub_if_data *subif;
 141         struct ieee802154_local *local = sdata->local;
 142         int res = 0;
 143
 144         ASSERT_RTNL();
 145
 146         if (sdata->vif.type == NL802154_IFTYPE_NODE) {
 147                 mutex_lock(&sdata->local->iflist_mtx);
 148                 list_for_each_entry(subif, &sdata->local->interfaces, list) {
 149                         if (subif != sdata &&
 150                             subif->vif.type == sdata->vif.type &&
 151                             ieee802154_sdata_running(subif)) {
 152                                 mutex_unlock(&sdata->local->iflist_mtx);
 153                                 return -EBUSY;
 154                         }
 155                 }
 156                 mutex_unlock(&sdata->local->iflist_mtx);
 157         }
 158
 159         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 160
 161         if (!local->open_count) {
 162                 res = drv_start(local);
 163                 WARN_ON(res);
 164                 if (res)
 165                         goto err;
 166         }
 167
 168         local->open_count++;
 169         netif_start_queue(dev);
 170         return 0;
 171 err:
 172         /* might already be clear but that doesn't matter */
 173         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 174
 175         return res;
 176 }
 177
 178 static int mac802154_wpan_open(struct net_device *dev)
 179 {
 180         int rc;
 181         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 182         struct ieee802154_local *local = sdata->local;
 183         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 184         struct wpan_phy *phy = sdata->local->phy;
 185
 186         rc = mac802154_slave_open(dev);
 187         if (rc < 0)
 188                 return rc;
 189
 190         mutex_lock(&phy->pib_lock);
 191
 192         if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
 193                 rc = drv_set_promiscuous_mode(local,
 194                                               wpan_dev->promiscuous_mode);
 195                 if (rc < 0)
 196                         goto out;
 197         }
 198
 199         if (local->hw.flags & IEEE802154_HW_AFILT) {
 200                 rc = drv_set_pan_id(local, wpan_dev->pan_id);
 201                 if (rc < 0)
 202                         goto out;
 203
 204                 rc = drv_set_extended_addr(local, wpan_dev->extended_addr);
 205                 if (rc < 0)
 206                         goto out;
 207
 208                 rc = drv_set_short_addr(local, wpan_dev->short_addr);
 209                 if (rc < 0)
 210                         goto out;
 211         }
 212
 213         if (local->hw.flags & IEEE802154_HW_LBT) {
 214                 rc = drv_set_lbt_mode(local, wpan_dev->lbt);
 215                 if (rc < 0)
 216                         goto out;
 217         }
 218
 219         if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
 220                 rc = drv_set_csma_params(local, wpan_dev->min_be,
 221                                          wpan_dev->max_be,
 222                                          wpan_dev->csma_retries);
 223                 if (rc < 0)
 224                         goto out;
 225         }
 226
 227         if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
 228                 rc = drv_set_max_frame_retries(local, wpan_dev->frame_retries);
 229                 if (rc < 0)
 230                         goto out;
 231         }
 232
 233         mutex_unlock(&phy->pib_lock);
 234         return 0;
 235
 236 out:
 237         mutex_unlock(&phy->pib_lock);
 238         return rc;
 239 }
 240
 241 static int mac802154_slave_close(struct net_device *dev)
 242 {
 243         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 244         struct ieee802154_local *local = sdata->local;
 245
 246         ASSERT_RTNL();
 247
 248         hrtimer_cancel(&local->ifs_timer);
 249
 250         netif_stop_queue(dev);
 251         local->open_count--;
 252
 253         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 254
 255         if (!local->open_count)
 256                 drv_stop(local);
 257
 258         return 0;
 259 }
 260
 261 static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
 262                                          struct ieee802154_hdr *hdr,
 263                                          const struct ieee802154_mac_cb *cb)
 264 {
 265         struct ieee802154_llsec_params params;
 266         u8 level;
 267
 268         mac802154_llsec_get_params(&sdata->sec, &params);
 269
 270         if (!params.enabled && cb->secen_override && cb->secen)
 271                 return -EINVAL;
 272         if (!params.enabled ||
 273             (cb->secen_override && !cb->secen) ||
 274             !params.out_level)
 275                 return 0;
 276         if (cb->seclevel_override && !cb->seclevel)
 277                 return -EINVAL;
 278
 279         level = cb->seclevel_override ? cb->seclevel : params.out_level;
 280
 281         hdr->fc.security_enabled = 1;
 282         hdr->sec.level = level;
 283         hdr->sec.key_id_mode = params.out_key.mode;
 284         if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
 285                 hdr->sec.short_src = params.out_key.short_source;
 286         else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
 287                 hdr->sec.extended_src = params.out_key.extended_source;
 288         hdr->sec.key_id = params.out_key.id;
 289
 290         return 0;
 291 }
 292
 293 static int mac802154_header_create(struct sk_buff *skb,
 294                                    struct net_device *dev,
 295                                    unsigned short type,
 296                                    const void *daddr,
 297                                    const void *saddr,
 298                                    unsigned len)
 299 {
 300         struct ieee802154_hdr hdr;
 301         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 302         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 303         struct ieee802154_mac_cb *cb = mac_cb(skb);
 304         int hlen;
 305
 306         if (!daddr)
 307                 return -EINVAL;
 308
 309         memset(&hdr.fc, 0, sizeof(hdr.fc));
 310         hdr.fc.type = cb->type;
 311         hdr.fc.security_enabled = cb->secen;
 312         hdr.fc.ack_request = cb->ackreq;
 313         hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
 314
 315         if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
 316                 return -EINVAL;
 317
 318         if (!saddr) {
 319                 spin_lock_bh(&sdata->mib_lock);
 320
 321                 if (wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
 322                     wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
 323                     wpan_dev->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
 324                         hdr.source.mode = IEEE802154_ADDR_LONG;
 325                         hdr.source.extended_addr = wpan_dev->extended_addr;
 326                 } else {
 327                         hdr.source.mode = IEEE802154_ADDR_SHORT;
 328                         hdr.source.short_addr = wpan_dev->short_addr;
 329                 }
 330
 331                 hdr.source.pan_id = wpan_dev->pan_id;
 332
 333                 spin_unlock_bh(&sdata->mib_lock);
 334         } else {
 335                 hdr.source = *(const struct ieee802154_addr *)saddr;
 336         }
 337
 338         hdr.dest = *(const struct ieee802154_addr *)daddr;
 339
 340         hlen = ieee802154_hdr_push(skb, &hdr);
 341         if (hlen < 0)
 342                 return -EINVAL;
 343
 344         skb_reset_mac_header(skb);
 345         skb->mac_len = hlen;
 346
 347         if (len > ieee802154_max_payload(&hdr))
 348                 return -EMSGSIZE;
 349
 350         return hlen;
 351 }
 352
 353 static int
 354 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 355 {
 356         struct ieee802154_hdr hdr;
 357         struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
 358
 359         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
 360                 pr_debug("malformed packet\n");
 361                 return 0;
 362         }
 363
 364         *addr = hdr.source;
 365         return sizeof(*addr);
 366 }
 367
 368 static struct header_ops mac802154_header_ops = {
 369         .create         = mac802154_header_create,
 370         .parse          = mac802154_header_parse,
 371 };
 372
 373 static const struct net_device_ops mac802154_wpan_ops = {
 374         .ndo_open               = mac802154_wpan_open,
 375         .ndo_stop               = mac802154_slave_close,
 376         .ndo_start_xmit         = ieee802154_subif_start_xmit,
 377         .ndo_do_ioctl           = mac802154_wpan_ioctl,
 378         .ndo_set_mac_address    = mac802154_wpan_mac_addr,
 379 };
 380
 381 static const struct net_device_ops mac802154_monitor_ops = {
 382         .ndo_open               = mac802154_wpan_open,
 383         .ndo_stop               = mac802154_slave_close,
 384         .ndo_start_xmit         = ieee802154_monitor_start_xmit,
 385 };
 386
 387 static void mac802154_wpan_free(struct net_device *dev)
 388 {
 389         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 390
 391         mac802154_llsec_destroy(&sdata->sec);
 392
 393         free_netdev(dev);
 394 }
 395
 396 static void ieee802154_if_setup(struct net_device *dev)
 397 {
 398         dev->addr_len           = IEEE802154_EXTENDED_ADDR_LEN;
 399         memset(dev->broadcast, 0xff, IEEE802154_EXTENDED_ADDR_LEN);
 400
 401         dev->hard_header_len    = MAC802154_FRAME_HARD_HEADER_LEN;
 402         dev->needed_tailroom    = 2 + 16; /* FCS + MIC */
 403         dev->mtu                = IEEE802154_MTU;
 404         dev->tx_queue_len       = 300;
 405         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 406 }
 407
 408 static int
 409 ieee802154_setup_sdata(struct ieee802154_sub_if_data *sdata,
 410                        enum nl802154_iftype type)
 411 {
 412         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 413
 414         /* set some type-dependent values */
 415         sdata->vif.type = type;
 416         sdata->wpan_dev.iftype = type;
 417
 418         get_random_bytes(&wpan_dev->bsn, 1);
 419         get_random_bytes(&wpan_dev->dsn, 1);
 420
 421         /* defaults per 802.15.4-2011 */
 422         wpan_dev->min_be = 3;
 423         wpan_dev->max_be = 5;
 424         wpan_dev->csma_retries = 4;
 425         /* for compatibility, actual default is 3 */
 426         wpan_dev->frame_retries = -1;
 427
 428         wpan_dev->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
 429         wpan_dev->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
 430
 431         switch (type) {
 432         case NL802154_IFTYPE_NODE:
 433                 ieee802154_be64_to_le64(&wpan_dev->extended_addr,
 434                                         sdata->dev->dev_addr);
 435
 436                 sdata->dev->header_ops = &mac802154_header_ops;
 437                 sdata->dev->destructor = mac802154_wpan_free;
 438                 sdata->dev->netdev_ops = &mac802154_wpan_ops;
 439                 sdata->dev->ml_priv = &mac802154_mlme_wpan;
 440                 wpan_dev->promiscuous_mode = false;
 441
 442                 spin_lock_init(&sdata->mib_lock);
 443                 mutex_init(&sdata->sec_mtx);
 444
 445                 mac802154_llsec_init(&sdata->sec);
 446                 break;
 447         case NL802154_IFTYPE_MONITOR:
 448                 sdata->dev->destructor = free_netdev;
 449                 sdata->dev->netdev_ops = &mac802154_monitor_ops;
 450                 wpan_dev->promiscuous_mode = true;
 451                 break;
 452         default:
 453                 BUG();
 454         }
 455
 456         return 0;
 457 }
 458
 459 struct net_device *
 460 ieee802154_if_add(struct ieee802154_local *local, const char *name,
 461                   enum nl802154_iftype type, __le64 extended_addr)
 462 {
 463         struct net_device *ndev = NULL;
 464         struct ieee802154_sub_if_data *sdata = NULL;
 465         int ret = -ENOMEM;
 466
 467         ASSERT_RTNL();
 468
 469         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, name,
 470                             NET_NAME_UNKNOWN, ieee802154_if_setup);
 471         if (!ndev)
 472                 return ERR_PTR(-ENOMEM);
 473
 474         ndev->needed_headroom = local->hw.extra_tx_headroom;
 475
 476         ret = dev_alloc_name(ndev, ndev->name);
 477         if (ret < 0)
 478                 goto err;
 479
 480         ieee802154_le64_to_be64(ndev->perm_addr,
 481                                 &local->hw.phy->perm_extended_addr);
 482         switch (type) {
 483         case NL802154_IFTYPE_NODE:
 484                 ndev->type = ARPHRD_IEEE802154;
 485                 if (ieee802154_is_valid_extended_addr(extended_addr))
 486                         ieee802154_le64_to_be64(ndev->dev_addr, &extended_addr);
 487                 else
 488                         memcpy(ndev->dev_addr, ndev->perm_addr,
 489                                IEEE802154_EXTENDED_ADDR_LEN);
 490                 break;
 491         case NL802154_IFTYPE_MONITOR:
 492                 ndev->type = ARPHRD_IEEE802154_MONITOR;
 493                 break;
 494         default:
 495                 ret = -EINVAL;
 496                 goto err;
 497         }
 498
 499         /* TODO check this */
 500         SET_NETDEV_DEV(ndev, &local->phy->dev);
 501         sdata = netdev_priv(ndev);
 502         ndev->ieee802154_ptr = &sdata->wpan_dev;
 503         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 504         sdata->dev = ndev;
 505         sdata->wpan_dev.wpan_phy = local->hw.phy;
 506         sdata->local = local;
 507
 508         /* setup type-dependent data */
 509         ret = ieee802154_setup_sdata(sdata, type);
 510         if (ret)
 511                 goto err;
 512
 513         if (ndev) {
 514                 ret = register_netdevice(ndev);
 515                 if (ret < 0)
 516                         goto err;
 517         }
 518
 519         mutex_lock(&local->iflist_mtx);
 520         list_add_tail_rcu(&sdata->list, &local->interfaces);
 521         mutex_unlock(&local->iflist_mtx);
 522
 523         return ndev;
 524
 525 err:
 526         free_netdev(ndev);
 527         return ERR_PTR(ret);
 528 }
 529
 530 void ieee802154_if_remove(struct ieee802154_sub_if_data *sdata)
 531 {
 532         ASSERT_RTNL();
 533
 534         mutex_lock(&sdata->local->iflist_mtx);
 535         list_del_rcu(&sdata->list);
 536         mutex_unlock(&sdata->local->iflist_mtx);
 537
 538         synchronize_rcu();
 539         unregister_netdevice(sdata->dev);
 540 }
 541
 542 void ieee802154_remove_interfaces(struct ieee802154_local *local)
 543 {
 544         struct ieee802154_sub_if_data *sdata, *tmp;
 545
 546         mutex_lock(&local->iflist_mtx);
 547         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 548                 list_del(&sdata->list);
 549
 550                 unregister_netdevice(sdata->dev);
 551         }
 552         mutex_unlock(&local->iflist_mtx);
 553 }
 554
 555 static int netdev_notify(struct notifier_block *nb,
 556                          unsigned long state, void *ptr)
 557 {
 558         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 559         struct ieee802154_sub_if_data *sdata;
 560
 561         if (state != NETDEV_CHANGENAME)
 562                 return NOTIFY_DONE;
 563
 564         if (!dev->ieee802154_ptr || !dev->ieee802154_ptr->wpan_phy)
 565                 return NOTIFY_DONE;
 566
 567         if (dev->ieee802154_ptr->wpan_phy->privid != mac802154_wpan_phy_privid)
 568                 return NOTIFY_DONE;
 569
 570         sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 571         memcpy(sdata->name, dev->name, IFNAMSIZ);
 572
 573         return NOTIFY_OK;
 574 }
 575
 576 static struct notifier_block mac802154_netdev_notifier = {
 577         .notifier_call = netdev_notify,
 578 };
 579
 580 int ieee802154_iface_init(void)
 581 {
 582         return register_netdevice_notifier(&mac802154_netdev_notifier);
 583 }
 584
 585 void ieee802154_iface_exit(void)
 586 {
 587         unregister_netdevice_notifier(&mac802154_netdev_notifier);
 588 }