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, sdata->mac_params.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, sdata->mac_params.min_be,
 215                                          sdata->mac_params.max_be,
 216                                          sdata->mac_params.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,
 223                                                sdata->mac_params.frame_retries);
 224                 if (rc < 0)
 225                         goto out;
 226         }
 227
 228         mutex_unlock(&phy->pib_lock);
 229         return 0;
 230
 231 out:
 232         mutex_unlock(&phy->pib_lock);
 233         return rc;
 234 }
 235
 236 static int mac802154_slave_close(struct net_device *dev)
 237 {
 238         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 239         struct ieee802154_local *local = sdata->local;
 240
 241         ASSERT_RTNL();
 242
 243         netif_stop_queue(dev);
 244         local->open_count--;
 245
 246         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 247
 248         if (!local->open_count)
 249                 drv_stop(local);
 250
 251         return 0;
 252 }
 253
 254 static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
 255                                          struct ieee802154_hdr *hdr,
 256                                          const struct ieee802154_mac_cb *cb)
 257 {
 258         struct ieee802154_llsec_params params;
 259         u8 level;
 260
 261         mac802154_llsec_get_params(&sdata->sec, &params);
 262
 263         if (!params.enabled && cb->secen_override && cb->secen)
 264                 return -EINVAL;
 265         if (!params.enabled ||
 266             (cb->secen_override && !cb->secen) ||
 267             !params.out_level)
 268                 return 0;
 269         if (cb->seclevel_override && !cb->seclevel)
 270                 return -EINVAL;
 271
 272         level = cb->seclevel_override ? cb->seclevel : params.out_level;
 273
 274         hdr->fc.security_enabled = 1;
 275         hdr->sec.level = level;
 276         hdr->sec.key_id_mode = params.out_key.mode;
 277         if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
 278                 hdr->sec.short_src = params.out_key.short_source;
 279         else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
 280                 hdr->sec.extended_src = params.out_key.extended_source;
 281         hdr->sec.key_id = params.out_key.id;
 282
 283         return 0;
 284 }
 285
 286 static int mac802154_header_create(struct sk_buff *skb,
 287                                    struct net_device *dev,
 288                                    unsigned short type,
 289                                    const void *daddr,
 290                                    const void *saddr,
 291                                    unsigned len)
 292 {
 293         struct ieee802154_hdr hdr;
 294         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 295         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 296         struct ieee802154_mac_cb *cb = mac_cb(skb);
 297         int hlen;
 298
 299         if (!daddr)
 300                 return -EINVAL;
 301
 302         memset(&hdr.fc, 0, sizeof(hdr.fc));
 303         hdr.fc.type = cb->type;
 304         hdr.fc.security_enabled = cb->secen;
 305         hdr.fc.ack_request = cb->ackreq;
 306         hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
 307
 308         if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
 309                 return -EINVAL;
 310
 311         if (!saddr) {
 312                 spin_lock_bh(&sdata->mib_lock);
 313
 314                 if (wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
 315                     wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
 316                     wpan_dev->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
 317                         hdr.source.mode = IEEE802154_ADDR_LONG;
 318                         hdr.source.extended_addr = wpan_dev->extended_addr;
 319                 } else {
 320                         hdr.source.mode = IEEE802154_ADDR_SHORT;
 321                         hdr.source.short_addr = wpan_dev->short_addr;
 322                 }
 323
 324                 hdr.source.pan_id = wpan_dev->pan_id;
 325
 326                 spin_unlock_bh(&sdata->mib_lock);
 327         } else {
 328                 hdr.source = *(const struct ieee802154_addr *)saddr;
 329         }
 330
 331         hdr.dest = *(const struct ieee802154_addr *)daddr;
 332
 333         hlen = ieee802154_hdr_push(skb, &hdr);
 334         if (hlen < 0)
 335                 return -EINVAL;
 336
 337         skb_reset_mac_header(skb);
 338         skb->mac_len = hlen;
 339
 340         if (len > ieee802154_max_payload(&hdr))
 341                 return -EMSGSIZE;
 342
 343         return hlen;
 344 }
 345
 346 static int
 347 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 348 {
 349         struct ieee802154_hdr hdr;
 350         struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
 351
 352         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
 353                 pr_debug("malformed packet\n");
 354                 return 0;
 355         }
 356
 357         *addr = hdr.source;
 358         return sizeof(*addr);
 359 }
 360
 361 static struct header_ops mac802154_header_ops = {
 362         .create         = mac802154_header_create,
 363         .parse          = mac802154_header_parse,
 364 };
 365
 366 static const struct net_device_ops mac802154_wpan_ops = {
 367         .ndo_open               = mac802154_wpan_open,
 368         .ndo_stop               = mac802154_slave_close,
 369         .ndo_start_xmit         = ieee802154_subif_start_xmit,
 370         .ndo_do_ioctl           = mac802154_wpan_ioctl,
 371         .ndo_set_mac_address    = mac802154_wpan_mac_addr,
 372 };
 373
 374 static const struct net_device_ops mac802154_monitor_ops = {
 375         .ndo_open               = mac802154_wpan_open,
 376         .ndo_stop               = mac802154_slave_close,
 377         .ndo_start_xmit         = ieee802154_monitor_start_xmit,
 378 };
 379
 380 static void mac802154_wpan_free(struct net_device *dev)
 381 {
 382         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 383
 384         mac802154_llsec_destroy(&sdata->sec);
 385
 386         free_netdev(dev);
 387 }
 388
 389 static void ieee802154_if_setup(struct net_device *dev)
 390 {
 391         dev->addr_len           = IEEE802154_EXTENDED_ADDR_LEN;
 392         memset(dev->broadcast, 0xff, IEEE802154_EXTENDED_ADDR_LEN);
 393
 394         dev->hard_header_len    = MAC802154_FRAME_HARD_HEADER_LEN;
 395         dev->needed_tailroom    = 2 + 16; /* FCS + MIC */
 396         dev->mtu                = IEEE802154_MTU;
 397         dev->tx_queue_len       = 300;
 398         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 399 }
 400
 401 static int
 402 ieee802154_setup_sdata(struct ieee802154_sub_if_data *sdata, int type)
 403 {
 404         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 405
 406         /* set some type-dependent values */
 407         sdata->vif.type = type;
 408
 409         get_random_bytes(&wpan_dev->bsn, 1);
 410         get_random_bytes(&wpan_dev->dsn, 1);
 411
 412         /* defaults per 802.15.4-2011 */
 413         sdata->mac_params.min_be = 3;
 414         sdata->mac_params.max_be = 5;
 415         sdata->mac_params.csma_retries = 4;
 416         /* for compatibility, actual default is 3 */
 417         sdata->mac_params.frame_retries = -1;
 418
 419         ieee802154_be64_to_le64(&wpan_dev->extended_addr, sdata->dev->dev_addr);
 420         wpan_dev->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
 421         wpan_dev->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
 422
 423         switch (type) {
 424         case IEEE802154_DEV_WPAN:
 425                 sdata->dev->header_ops = &mac802154_header_ops;
 426                 sdata->dev->destructor = mac802154_wpan_free;
 427                 sdata->dev->netdev_ops = &mac802154_wpan_ops;
 428                 sdata->dev->ml_priv = &mac802154_mlme_wpan;
 429                 wpan_dev->promiscuous_mode = false;
 430
 431                 spin_lock_init(&sdata->mib_lock);
 432                 mutex_init(&sdata->sec_mtx);
 433
 434                 mac802154_llsec_init(&sdata->sec);
 435                 break;
 436         case IEEE802154_DEV_MONITOR:
 437                 sdata->dev->destructor = free_netdev;
 438                 sdata->dev->netdev_ops = &mac802154_monitor_ops;
 439                 wpan_dev->promiscuous_mode = true;
 440                 break;
 441         default:
 442                 BUG();
 443         }
 444
 445         return 0;
 446 }
 447
 448 struct net_device *
 449 ieee802154_if_add(struct ieee802154_local *local, const char *name,
 450                   struct wpan_dev **new_wpan_dev, int type)
 451 {
 452         struct net_device *ndev = NULL;
 453         struct ieee802154_sub_if_data *sdata = NULL;
 454         int ret = -ENOMEM;
 455
 456         ASSERT_RTNL();
 457
 458         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, name,
 459                             NET_NAME_UNKNOWN, ieee802154_if_setup);
 460         if (!ndev)
 461                 return ERR_PTR(-ENOMEM);
 462
 463         ndev->needed_headroom = local->hw.extra_tx_headroom;
 464
 465         ret = dev_alloc_name(ndev, ndev->name);
 466         if (ret < 0)
 467                 goto err;
 468
 469         switch (type) {
 470         case IEEE802154_DEV_WPAN:
 471                 ndev->type = ARPHRD_IEEE802154;
 472                 break;
 473         case IEEE802154_DEV_MONITOR:
 474                 ndev->type = ARPHRD_IEEE802154_MONITOR;
 475                 break;
 476         default:
 477                 ret = -EINVAL;
 478                 goto err;
 479         }
 480
 481         ieee802154_le64_to_be64(ndev->perm_addr,
 482                                 &local->hw.phy->perm_extended_addr);
 483         memcpy(ndev->dev_addr, ndev->perm_addr, IEEE802154_EXTENDED_ADDR_LEN);
 484         /* TODO check this */
 485         SET_NETDEV_DEV(ndev, &local->phy->dev);
 486         sdata = netdev_priv(ndev);
 487         ndev->ieee802154_ptr = &sdata->wpan_dev;
 488         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 489         sdata->dev = ndev;
 490         sdata->wpan_dev.wpan_phy = local->hw.phy;
 491         sdata->local = local;
 492
 493         /* setup type-dependent data */
 494         ret = ieee802154_setup_sdata(sdata, type);
 495         if (ret)
 496                 goto err;
 497
 498         if (ndev) {
 499                 ret = register_netdevice(ndev);
 500                 if (ret < 0)
 501                         goto err;
 502         }
 503
 504         mutex_lock(&local->iflist_mtx);
 505         list_add_tail_rcu(&sdata->list, &local->interfaces);
 506         mutex_unlock(&local->iflist_mtx);
 507
 508         if (new_wpan_dev)
 509                 *new_wpan_dev = &sdata->wpan_dev;
 510
 511         return ndev;
 512
 513 err:
 514         free_netdev(ndev);
 515         return ERR_PTR(ret);
 516 }
 517
 518 void ieee802154_if_remove(struct ieee802154_sub_if_data *sdata)
 519 {
 520         ASSERT_RTNL();
 521
 522         mutex_lock(&sdata->local->iflist_mtx);
 523         list_del_rcu(&sdata->list);
 524         mutex_unlock(&sdata->local->iflist_mtx);
 525
 526         synchronize_rcu();
 527         unregister_netdevice(sdata->dev);
 528 }