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