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/rtnetlink.h>
  26 #include <linux/nl802154.h>
  27 #include <net/mac802154.h>
  28 #include <net/ieee802154_netdev.h>
  29 #include <net/cfg802154.h>
  30
  31 #include "ieee802154_i.h"
  32 #include "driver-ops.h"
  33
  34 static int mac802154_wpan_update_llsec(struct net_device *dev)
  35 {
  36         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  37         struct ieee802154_mlme_ops *ops = ieee802154_mlme_ops(dev);
  38         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
  39         int rc = 0;
  40
  41         if (ops->llsec) {
  42                 struct ieee802154_llsec_params params;
  43                 int changed = 0;
  44
  45                 params.pan_id = wpan_dev->pan_id;
  46                 changed |= IEEE802154_LLSEC_PARAM_PAN_ID;
  47
  48                 params.hwaddr = wpan_dev->extended_addr;
  49                 changed |= IEEE802154_LLSEC_PARAM_HWADDR;
  50
  51                 rc = ops->llsec->set_params(dev, &params, changed);
  52         }
  53
  54         return rc;
  55 }
  56
  57 static int
  58 mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
  59 {
  60         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  61         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
  62         struct sockaddr_ieee802154 *sa =
  63                 (struct sockaddr_ieee802154 *)&ifr->ifr_addr;
  64         int err = -ENOIOCTLCMD;
  65
  66         ASSERT_RTNL();
  67
  68         spin_lock_bh(&sdata->mib_lock);
  69
  70         switch (cmd) {
  71         case SIOCGIFADDR:
  72         {
  73                 u16 pan_id, short_addr;
  74
  75                 pan_id = le16_to_cpu(wpan_dev->pan_id);
  76                 short_addr = le16_to_cpu(wpan_dev->short_addr);
  77                 if (pan_id == IEEE802154_PANID_BROADCAST ||
  78                     short_addr == IEEE802154_ADDR_BROADCAST) {
  79                         err = -EADDRNOTAVAIL;
  80                         break;
  81                 }
  82
  83                 sa->family = AF_IEEE802154;
  84                 sa->addr.addr_type = IEEE802154_ADDR_SHORT;
  85                 sa->addr.pan_id = pan_id;
  86                 sa->addr.short_addr = short_addr;
  87
  88                 err = 0;
  89                 break;
  90         }
  91         case SIOCSIFADDR:
  92                 if (netif_running(dev)) {
  93                         spin_unlock_bh(&sdata->mib_lock);
  94                         return -EBUSY;
  95                 }
  96
  97                 dev_warn(&dev->dev,
  98                          "Using DEBUGing ioctl SIOCSIFADDR isn't recommended!\n");
  99                 if (sa->family != AF_IEEE802154 ||
 100                     sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
 101                     sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
 102                     sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
 103                     sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
 104                         err = -EINVAL;
 105                         break;
 106                 }
 107
 108                 wpan_dev->pan_id = cpu_to_le16(sa->addr.pan_id);
 109                 wpan_dev->short_addr = cpu_to_le16(sa->addr.short_addr);
 110
 111                 err = mac802154_wpan_update_llsec(dev);
 112                 break;
 113         }
 114
 115         spin_unlock_bh(&sdata->mib_lock);
 116         return err;
 117 }
 118
 119 static int mac802154_wpan_mac_addr(struct net_device *dev, void *p)
 120 {
 121         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 122         struct sockaddr *addr = p;
 123         __le64 extended_addr;
 124
 125         if (netif_running(dev))
 126                 return -EBUSY;
 127
 128         ieee802154_be64_to_le64(&extended_addr, addr->sa_data);
 129         if (!ieee802154_is_valid_extended_addr(extended_addr))
 130                 return -EINVAL;
 131
 132         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 133         sdata->wpan_dev.extended_addr = extended_addr;
 134
 135         return mac802154_wpan_update_llsec(dev);
 136 }
 137
 138 static int mac802154_slave_open(struct net_device *dev)
 139 {
 140         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 141         struct ieee802154_sub_if_data *subif;
 142         struct ieee802154_local *local = sdata->local;
 143         int res = 0;
 144
 145         ASSERT_RTNL();
 146
 147         if (sdata->vif.type == IEEE802154_DEV_WPAN) {
 148                 mutex_lock(&sdata->local->iflist_mtx);
 149                 list_for_each_entry(subif, &sdata->local->interfaces, list) {
 150                         if (subif != sdata &&
 151                             subif->vif.type == sdata->vif.type &&
 152                             ieee802154_sdata_running(subif)) {
 153                                 mutex_unlock(&sdata->local->iflist_mtx);
 154                                 return -EBUSY;
 155                         }
 156                 }
 157                 mutex_unlock(&sdata->local->iflist_mtx);
 158         }
 159
 160         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 161
 162         if (!local->open_count) {
 163                 res = drv_start(local);
 164                 WARN_ON(res);
 165                 if (res)
 166                         goto err;
 167         }
 168
 169         local->open_count++;
 170         netif_start_queue(dev);
 171         return 0;
 172 err:
 173         /* might already be clear but that doesn't matter */
 174         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 175
 176         return res;
 177 }
 178
 179 static int mac802154_wpan_open(struct net_device *dev)
 180 {
 181         int rc;
 182         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 183         struct ieee802154_local *local = sdata->local;
 184         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 185         struct wpan_phy *phy = sdata->local->phy;
 186
 187         rc = mac802154_slave_open(dev);
 188         if (rc < 0)
 189                 return rc;
 190
 191         mutex_lock(&phy->pib_lock);
 192
 193         if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
 194                 rc = drv_set_promiscuous_mode(local,
 195                                               wpan_dev->promiscuous_mode);
 196                 if (rc < 0)
 197                         goto out;
 198         }
 199
 200         if (local->hw.flags & IEEE802154_HW_AFILT) {
 201                 rc = drv_set_pan_id(local, wpan_dev->pan_id);
 202                 if (rc < 0)
 203                         goto out;
 204
 205                 rc = drv_set_extended_addr(local, wpan_dev->extended_addr);
 206                 if (rc < 0)
 207                         goto out;
 208
 209                 rc = drv_set_short_addr(local, wpan_dev->short_addr);
 210                 if (rc < 0)
 211                         goto out;
 212         }
 213
 214         if (local->hw.flags & IEEE802154_HW_LBT) {
 215                 rc = drv_set_lbt_mode(local, wpan_dev->lbt);
 216                 if (rc < 0)
 217                         goto out;
 218         }
 219
 220         if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
 221                 rc = drv_set_csma_params(local, wpan_dev->min_be,
 222                                          wpan_dev->max_be,
 223                                          wpan_dev->csma_retries);
 224                 if (rc < 0)
 225                         goto out;
 226         }
 227
 228         if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
 229                 rc = drv_set_max_frame_retries(local, wpan_dev->frame_retries);
 230                 if (rc < 0)
 231                         goto out;
 232         }
 233
 234         mutex_unlock(&phy->pib_lock);
 235         return 0;
 236
 237 out:
 238         mutex_unlock(&phy->pib_lock);
 239         return rc;
 240 }
 241
 242 static int mac802154_slave_close(struct net_device *dev)
 243 {
 244         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 245         struct ieee802154_local *local = sdata->local;
 246
 247         ASSERT_RTNL();
 248
 249         netif_stop_queue(dev);
 250         local->open_count--;
 251
 252         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 253
 254         if (!local->open_count)
 255                 drv_stop(local);
 256
 257         return 0;
 258 }
 259
 260 static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
 261                                          struct ieee802154_hdr *hdr,
 262                                          const struct ieee802154_mac_cb *cb)
 263 {
 264         struct ieee802154_llsec_params params;
 265         u8 level;
 266
 267         mac802154_llsec_get_params(&sdata->sec, &params);
 268
 269         if (!params.enabled && cb->secen_override && cb->secen)
 270                 return -EINVAL;
 271         if (!params.enabled ||
 272             (cb->secen_override && !cb->secen) ||
 273             !params.out_level)
 274                 return 0;
 275         if (cb->seclevel_override && !cb->seclevel)
 276                 return -EINVAL;
 277
 278         level = cb->seclevel_override ? cb->seclevel : params.out_level;
 279
 280         hdr->fc.security_enabled = 1;
 281         hdr->sec.level = level;
 282         hdr->sec.key_id_mode = params.out_key.mode;
 283         if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
 284                 hdr->sec.short_src = params.out_key.short_source;
 285         else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
 286                 hdr->sec.extended_src = params.out_key.extended_source;
 287         hdr->sec.key_id = params.out_key.id;
 288
 289         return 0;
 290 }
 291
 292 static int mac802154_header_create(struct sk_buff *skb,
 293                                    struct net_device *dev,
 294                                    unsigned short type,
 295                                    const void *daddr,
 296                                    const void *saddr,
 297                                    unsigned len)
 298 {
 299         struct ieee802154_hdr hdr;
 300         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 301         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 302         struct ieee802154_mac_cb *cb = mac_cb(skb);
 303         int hlen;
 304
 305         if (!daddr)
 306                 return -EINVAL;
 307
 308         memset(&hdr.fc, 0, sizeof(hdr.fc));
 309         hdr.fc.type = cb->type;
 310         hdr.fc.security_enabled = cb->secen;
 311         hdr.fc.ack_request = cb->ackreq;
 312         hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
 313
 314         if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
 315                 return -EINVAL;
 316
 317         if (!saddr) {
 318                 spin_lock_bh(&sdata->mib_lock);
 319
 320                 if (wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
 321                     wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
 322                     wpan_dev->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
 323                         hdr.source.mode = IEEE802154_ADDR_LONG;
 324                         hdr.source.extended_addr = wpan_dev->extended_addr;
 325                 } else {
 326                         hdr.source.mode = IEEE802154_ADDR_SHORT;
 327                         hdr.source.short_addr = wpan_dev->short_addr;
 328                 }
 329
 330                 hdr.source.pan_id = wpan_dev->pan_id;
 331
 332                 spin_unlock_bh(&sdata->mib_lock);
 333         } else {
 334                 hdr.source = *(const struct ieee802154_addr *)saddr;
 335         }
 336
 337         hdr.dest = *(const struct ieee802154_addr *)daddr;
 338
 339         hlen = ieee802154_hdr_push(skb, &hdr);
 340         if (hlen < 0)
 341                 return -EINVAL;
 342
 343         skb_reset_mac_header(skb);
 344         skb->mac_len = hlen;
 345
 346         if (len > ieee802154_max_payload(&hdr))
 347                 return -EMSGSIZE;
 348
 349         return hlen;
 350 }
 351
 352 static int
 353 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 354 {
 355         struct ieee802154_hdr hdr;
 356         struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
 357
 358         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
 359                 pr_debug("malformed packet\n");
 360                 return 0;
 361         }
 362
 363         *addr = hdr.source;
 364         return sizeof(*addr);
 365 }
 366
 367 static struct header_ops mac802154_header_ops = {
 368         .create         = mac802154_header_create,
 369         .parse          = mac802154_header_parse,
 370 };
 371
 372 static const struct net_device_ops mac802154_wpan_ops = {
 373         .ndo_open               = mac802154_wpan_open,
 374         .ndo_stop               = mac802154_slave_close,
 375         .ndo_start_xmit         = ieee802154_subif_start_xmit,
 376         .ndo_do_ioctl           = mac802154_wpan_ioctl,
 377         .ndo_set_mac_address    = mac802154_wpan_mac_addr,
 378 };
 379
 380 static const struct net_device_ops mac802154_monitor_ops = {
 381         .ndo_open               = mac802154_wpan_open,
 382         .ndo_stop               = mac802154_slave_close,
 383         .ndo_start_xmit         = ieee802154_monitor_start_xmit,
 384 };
 385
 386 static void mac802154_wpan_free(struct net_device *dev)
 387 {
 388         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 389
 390         mac802154_llsec_destroy(&sdata->sec);
 391
 392         free_netdev(dev);
 393 }
 394
 395 static void ieee802154_if_setup(struct net_device *dev)
 396 {
 397         dev->addr_len           = IEEE802154_EXTENDED_ADDR_LEN;
 398         memset(dev->broadcast, 0xff, IEEE802154_EXTENDED_ADDR_LEN);
 399
 400         dev->hard_header_len    = MAC802154_FRAME_HARD_HEADER_LEN;
 401         dev->needed_tailroom    = 2 + 16; /* FCS + MIC */
 402         dev->mtu                = IEEE802154_MTU;
 403         dev->tx_queue_len       = 300;
 404         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 405 }
 406
 407 static int
 408 ieee802154_setup_sdata(struct ieee802154_sub_if_data *sdata, int type)
 409 {
 410         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 411
 412         /* set some type-dependent values */
 413         sdata->vif.type = type;
 414         sdata->wpan_dev.iftype = type;
 415
 416         get_random_bytes(&wpan_dev->bsn, 1);
 417         get_random_bytes(&wpan_dev->dsn, 1);
 418
 419         /* defaults per 802.15.4-2011 */
 420         wpan_dev->min_be = 3;
 421         wpan_dev->max_be = 5;
 422         wpan_dev->csma_retries = 4;
 423         /* for compatibility, actual default is 3 */
 424         wpan_dev->frame_retries = -1;
 425
 426         wpan_dev->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
 427         wpan_dev->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
 428
 429         switch (type) {
 430         case IEEE802154_DEV_WPAN:
 431                 ieee802154_be64_to_le64(&wpan_dev->extended_addr,
 432                                         sdata->dev->dev_addr);
 433
 434                 sdata->dev->header_ops = &mac802154_header_ops;
 435                 sdata->dev->destructor = mac802154_wpan_free;
 436                 sdata->dev->netdev_ops = &mac802154_wpan_ops;
 437                 sdata->dev->ml_priv = &mac802154_mlme_wpan;
 438                 wpan_dev->promiscuous_mode = false;
 439
 440                 spin_lock_init(&sdata->mib_lock);
 441                 mutex_init(&sdata->sec_mtx);
 442
 443                 mac802154_llsec_init(&sdata->sec);
 444                 break;
 445         case IEEE802154_DEV_MONITOR:
 446                 sdata->dev->destructor = free_netdev;
 447                 sdata->dev->netdev_ops = &mac802154_monitor_ops;
 448                 wpan_dev->promiscuous_mode = true;
 449                 break;
 450         default:
 451                 BUG();
 452         }
 453
 454         return 0;
 455 }
 456
 457 struct net_device *
 458 ieee802154_if_add(struct ieee802154_local *local, const char *name,
 459                   struct wpan_dev **new_wpan_dev, int type)
 460 {
 461         struct net_device *ndev = NULL;
 462         struct ieee802154_sub_if_data *sdata = NULL;
 463         int ret = -ENOMEM;
 464
 465         ASSERT_RTNL();
 466
 467         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, name,
 468                             NET_NAME_UNKNOWN, ieee802154_if_setup);
 469         if (!ndev)
 470                 return ERR_PTR(-ENOMEM);
 471
 472         ndev->needed_headroom = local->hw.extra_tx_headroom;
 473
 474         ret = dev_alloc_name(ndev, ndev->name);
 475         if (ret < 0)
 476                 goto err;
 477
 478         switch (type) {
 479         case IEEE802154_DEV_WPAN:
 480                 ndev->type = ARPHRD_IEEE802154;
 481                 break;
 482         case IEEE802154_DEV_MONITOR:
 483                 ndev->type = ARPHRD_IEEE802154_MONITOR;
 484                 break;
 485         default:
 486                 ret = -EINVAL;
 487                 goto err;
 488         }
 489
 490         ieee802154_le64_to_be64(ndev->perm_addr,
 491                                 &local->hw.phy->perm_extended_addr);
 492         memcpy(ndev->dev_addr, ndev->perm_addr, IEEE802154_EXTENDED_ADDR_LEN);
 493         /* TODO check this */
 494         SET_NETDEV_DEV(ndev, &local->phy->dev);
 495         sdata = netdev_priv(ndev);
 496         ndev->ieee802154_ptr = &sdata->wpan_dev;
 497         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 498         sdata->dev = ndev;
 499         sdata->wpan_dev.wpan_phy = local->hw.phy;
 500         sdata->local = local;
 501
 502         /* setup type-dependent data */
 503         ret = ieee802154_setup_sdata(sdata, type);
 504         if (ret)
 505                 goto err;
 506
 507         if (ndev) {
 508                 ret = register_netdevice(ndev);
 509                 if (ret < 0)
 510                         goto err;
 511         }
 512
 513         mutex_lock(&local->iflist_mtx);
 514         list_add_tail_rcu(&sdata->list, &local->interfaces);
 515         mutex_unlock(&local->iflist_mtx);
 516
 517         if (new_wpan_dev)
 518                 *new_wpan_dev = &sdata->wpan_dev;
 519
 520         return ndev;
 521
 522 err:
 523         free_netdev(ndev);
 524         return ERR_PTR(ret);
 525 }
 526
 527 void ieee802154_if_remove(struct ieee802154_sub_if_data *sdata)
 528 {
 529         ASSERT_RTNL();
 530
 531         mutex_lock(&sdata->local->iflist_mtx);
 532         list_del_rcu(&sdata->list);
 533         mutex_unlock(&sdata->local->iflist_mtx);
 534
 535         synchronize_rcu();
 536         unregister_netdevice(sdata->dev);
 537 }
 538
 539 void ieee802154_remove_interfaces(struct ieee802154_local *local)
 540 {
 541         struct ieee802154_sub_if_data *sdata, *tmp;
 542
 543         mutex_lock(&local->iflist_mtx);
 544         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 545                 list_del(&sdata->list);
 546
 547                 unregister_netdevice(sdata->dev);
 548         }
 549         mutex_unlock(&local->iflist_mtx);
 550 }
 551
 552 static int netdev_notify(struct notifier_block *nb,
 553                          unsigned long state, void *ptr)
 554 {
 555         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 556         struct ieee802154_sub_if_data *sdata;
 557
 558         if (state != NETDEV_CHANGENAME)
 559                 return NOTIFY_DONE;
 560
 561         if (!dev->ieee802154_ptr || !dev->ieee802154_ptr->wpan_phy)
 562                 return NOTIFY_DONE;
 563
 564         if (dev->ieee802154_ptr->wpan_phy->privid != mac802154_wpan_phy_privid)
 565                 return NOTIFY_DONE;
 566
 567         sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 568         memcpy(sdata->name, dev->name, IFNAMSIZ);
 569
 570         return NOTIFY_OK;
 571 }
 572
 573 static struct notifier_block mac802154_netdev_notifier = {
 574         .notifier_call = netdev_notify,
 575 };
 576
 577 int ieee802154_iface_init(void)
 578 {
 579         return register_netdevice_notifier(&mac802154_netdev_notifier);
 580 }
 581
 582 void ieee802154_iface_exit(void)
 583 {
 584         unregister_netdevice_notifier(&mac802154_netdev_notifier);
 585 }