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/af_ieee802154.h>
  28 #include <net/mac802154.h>
  29 #include <net/ieee802154_netdev.h>
  30 #include <net/cfg802154.h>
  31
  32 #include "ieee802154_i.h"
  33 #include "driver-ops.h"
  34
  35 static int mac802154_wpan_update_llsec(struct net_device *dev)
  36 {
  37         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  38         struct ieee802154_mlme_ops *ops = ieee802154_mlme_ops(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 = sdata->pan_id;
  46                 changed |= IEEE802154_LLSEC_PARAM_PAN_ID;
  47
  48                 params.hwaddr = sdata->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 sockaddr_ieee802154 *sa =
  62                 (struct sockaddr_ieee802154 *)&ifr->ifr_addr;
  63         int err = -ENOIOCTLCMD;
  64
  65         spin_lock_bh(&sdata->mib_lock);
  66
  67         switch (cmd) {
  68         case SIOCGIFADDR:
  69         {
  70                 u16 pan_id, short_addr;
  71
  72                 pan_id = le16_to_cpu(sdata->pan_id);
  73                 short_addr = le16_to_cpu(sdata->short_addr);
  74                 if (pan_id == IEEE802154_PANID_BROADCAST ||
  75                     short_addr == IEEE802154_ADDR_BROADCAST) {
  76                         err = -EADDRNOTAVAIL;
  77                         break;
  78                 }
  79
  80                 sa->family = AF_IEEE802154;
  81                 sa->addr.addr_type = IEEE802154_ADDR_SHORT;
  82                 sa->addr.pan_id = pan_id;
  83                 sa->addr.short_addr = short_addr;
  84
  85                 err = 0;
  86                 break;
  87         }
  88         case SIOCSIFADDR:
  89                 dev_warn(&dev->dev,
  90                          "Using DEBUGing ioctl SIOCSIFADDR isn't recommended!\n");
  91                 if (sa->family != AF_IEEE802154 ||
  92                     sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
  93                     sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
  94                     sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
  95                     sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
  96                         err = -EINVAL;
  97                         break;
  98                 }
  99
 100                 sdata->pan_id = cpu_to_le16(sa->addr.pan_id);
 101                 sdata->short_addr = cpu_to_le16(sa->addr.short_addr);
 102
 103                 err = mac802154_wpan_update_llsec(dev);
 104                 break;
 105         }
 106
 107         spin_unlock_bh(&sdata->mib_lock);
 108         return err;
 109 }
 110
 111 static int mac802154_wpan_mac_addr(struct net_device *dev, void *p)
 112 {
 113         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 114         struct sockaddr *addr = p;
 115         __le64 extended_addr;
 116
 117         if (netif_running(dev))
 118                 return -EBUSY;
 119
 120         ieee802154_be64_to_le64(&extended_addr, addr->sa_data);
 121         if (!ieee802154_is_valid_extended_addr(extended_addr))
 122                 return -EINVAL;
 123
 124         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 125         sdata->extended_addr = extended_addr;
 126
 127         return mac802154_wpan_update_llsec(dev);
 128 }
 129
 130 static int mac802154_slave_open(struct net_device *dev)
 131 {
 132         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 133         struct ieee802154_sub_if_data *subif;
 134         struct ieee802154_local *local = sdata->local;
 135         int res = 0;
 136
 137         ASSERT_RTNL();
 138
 139         if (sdata->vif.type == IEEE802154_DEV_WPAN) {
 140                 mutex_lock(&sdata->local->iflist_mtx);
 141                 list_for_each_entry(subif, &sdata->local->interfaces, list) {
 142                         if (subif != sdata &&
 143                             subif->vif.type == sdata->vif.type &&
 144                             ieee802154_sdata_running(subif)) {
 145                                 mutex_unlock(&sdata->local->iflist_mtx);
 146                                 return -EBUSY;
 147                         }
 148                 }
 149                 mutex_unlock(&sdata->local->iflist_mtx);
 150         }
 151
 152         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 153
 154         if (!local->open_count) {
 155                 res = drv_start(local);
 156                 WARN_ON(res);
 157                 if (res)
 158                         goto err;
 159         }
 160
 161         local->open_count++;
 162         netif_start_queue(dev);
 163         return 0;
 164 err:
 165         /* might already be clear but that doesn't matter */
 166         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 167
 168         return res;
 169 }
 170
 171 static int mac802154_wpan_open(struct net_device *dev)
 172 {
 173         int rc;
 174         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 175         struct ieee802154_local *local = sdata->local;
 176         struct wpan_phy *phy = sdata->local->phy;
 177
 178         rc = mac802154_slave_open(dev);
 179         if (rc < 0)
 180                 return rc;
 181
 182         mutex_lock(&phy->pib_lock);
 183
 184         if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
 185                 rc = drv_set_promiscuous_mode(local, sdata->promisuous_mode);
 186                 if (rc < 0)
 187                         goto out;
 188         }
 189
 190         if (local->hw.flags & IEEE802154_HW_AFILT) {
 191                 rc = drv_set_pan_id(local, sdata->pan_id);
 192                 if (rc < 0)
 193                         goto out;
 194
 195                 rc = drv_set_extended_addr(local, sdata->extended_addr);
 196                 if (rc < 0)
 197                         goto out;
 198
 199                 rc = drv_set_short_addr(local, sdata->short_addr);
 200                 if (rc < 0)
 201                         goto out;
 202         }
 203
 204         if (local->hw.flags & IEEE802154_HW_LBT) {
 205                 rc = drv_set_lbt_mode(local, sdata->mac_params.lbt);
 206                 if (rc < 0)
 207                         goto out;
 208         }
 209
 210         if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
 211                 rc = drv_set_csma_params(local, sdata->mac_params.min_be,
 212                                          sdata->mac_params.max_be,
 213                                          sdata->mac_params.csma_retries);
 214                 if (rc < 0)
 215                         goto out;
 216         }
 217
 218         if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
 219                 rc = drv_set_max_frame_retries(local,
 220                                                sdata->mac_params.frame_retries);
 221                 if (rc < 0)
 222                         goto out;
 223         }
 224
 225         mutex_unlock(&phy->pib_lock);
 226         return 0;
 227
 228 out:
 229         mutex_unlock(&phy->pib_lock);
 230         return rc;
 231 }
 232
 233 static int mac802154_slave_close(struct net_device *dev)
 234 {
 235         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 236         struct ieee802154_local *local = sdata->local;
 237
 238         ASSERT_RTNL();
 239
 240         netif_stop_queue(dev);
 241         local->open_count--;
 242
 243         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 244
 245         if (!local->open_count)
 246                 drv_stop(local);
 247
 248         return 0;
 249 }
 250
 251 static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
 252                                          struct ieee802154_hdr *hdr,
 253                                          const struct ieee802154_mac_cb *cb)
 254 {
 255         struct ieee802154_llsec_params params;
 256         u8 level;
 257
 258         mac802154_llsec_get_params(&sdata->sec, &params);
 259
 260         if (!params.enabled && cb->secen_override && cb->secen)
 261                 return -EINVAL;
 262         if (!params.enabled ||
 263             (cb->secen_override && !cb->secen) ||
 264             !params.out_level)
 265                 return 0;
 266         if (cb->seclevel_override && !cb->seclevel)
 267                 return -EINVAL;
 268
 269         level = cb->seclevel_override ? cb->seclevel : params.out_level;
 270
 271         hdr->fc.security_enabled = 1;
 272         hdr->sec.level = level;
 273         hdr->sec.key_id_mode = params.out_key.mode;
 274         if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
 275                 hdr->sec.short_src = params.out_key.short_source;
 276         else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
 277                 hdr->sec.extended_src = params.out_key.extended_source;
 278         hdr->sec.key_id = params.out_key.id;
 279
 280         return 0;
 281 }
 282
 283 static int mac802154_header_create(struct sk_buff *skb,
 284                                    struct net_device *dev,
 285                                    unsigned short type,
 286                                    const void *daddr,
 287                                    const void *saddr,
 288                                    unsigned len)
 289 {
 290         struct ieee802154_hdr hdr;
 291         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 292         struct ieee802154_mac_cb *cb = mac_cb(skb);
 293         int hlen;
 294
 295         if (!daddr)
 296                 return -EINVAL;
 297
 298         memset(&hdr.fc, 0, sizeof(hdr.fc));
 299         hdr.fc.type = cb->type;
 300         hdr.fc.security_enabled = cb->secen;
 301         hdr.fc.ack_request = cb->ackreq;
 302         hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
 303
 304         if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
 305                 return -EINVAL;
 306
 307         if (!saddr) {
 308                 spin_lock_bh(&sdata->mib_lock);
 309
 310                 if (sdata->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
 311                     sdata->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
 312                     sdata->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
 313                         hdr.source.mode = IEEE802154_ADDR_LONG;
 314                         hdr.source.extended_addr = sdata->extended_addr;
 315                 } else {
 316                         hdr.source.mode = IEEE802154_ADDR_SHORT;
 317                         hdr.source.short_addr = sdata->short_addr;
 318                 }
 319
 320                 hdr.source.pan_id = sdata->pan_id;
 321
 322                 spin_unlock_bh(&sdata->mib_lock);
 323         } else {
 324                 hdr.source = *(const struct ieee802154_addr *)saddr;
 325         }
 326
 327         hdr.dest = *(const struct ieee802154_addr *)daddr;
 328
 329         hlen = ieee802154_hdr_push(skb, &hdr);
 330         if (hlen < 0)
 331                 return -EINVAL;
 332
 333         skb_reset_mac_header(skb);
 334         skb->mac_len = hlen;
 335
 336         if (len > ieee802154_max_payload(&hdr))
 337                 return -EMSGSIZE;
 338
 339         return hlen;
 340 }
 341
 342 static int
 343 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 344 {
 345         struct ieee802154_hdr hdr;
 346         struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
 347
 348         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
 349                 pr_debug("malformed packet\n");
 350                 return 0;
 351         }
 352
 353         *addr = hdr.source;
 354         return sizeof(*addr);
 355 }
 356
 357 static struct header_ops mac802154_header_ops = {
 358         .create         = mac802154_header_create,
 359         .parse          = mac802154_header_parse,
 360 };
 361
 362 static const struct net_device_ops mac802154_wpan_ops = {
 363         .ndo_open               = mac802154_wpan_open,
 364         .ndo_stop               = mac802154_slave_close,
 365         .ndo_start_xmit         = ieee802154_subif_start_xmit,
 366         .ndo_do_ioctl           = mac802154_wpan_ioctl,
 367         .ndo_set_mac_address    = mac802154_wpan_mac_addr,
 368 };
 369
 370 static const struct net_device_ops mac802154_monitor_ops = {
 371         .ndo_open               = mac802154_wpan_open,
 372         .ndo_stop               = mac802154_slave_close,
 373         .ndo_start_xmit         = ieee802154_monitor_start_xmit,
 374 };
 375
 376 static void mac802154_wpan_free(struct net_device *dev)
 377 {
 378         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 379
 380         mac802154_llsec_destroy(&sdata->sec);
 381
 382         free_netdev(dev);
 383 }
 384
 385 static void ieee802154_if_setup(struct net_device *dev)
 386 {
 387         dev->addr_len           = IEEE802154_ADDR_LEN;
 388         memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
 389
 390         dev->hard_header_len    = MAC802154_FRAME_HARD_HEADER_LEN;
 391         dev->needed_tailroom    = 2 + 16; /* FCS + MIC */
 392         dev->mtu                = IEEE802154_MTU;
 393         dev->tx_queue_len       = 300;
 394         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 395 }
 396
 397 static int
 398 ieee802154_setup_sdata(struct ieee802154_sub_if_data *sdata, int type)
 399 {
 400         /* set some type-dependent values */
 401         sdata->vif.type = type;
 402
 403         get_random_bytes(&sdata->bsn, 1);
 404         get_random_bytes(&sdata->dsn, 1);
 405
 406         /* defaults per 802.15.4-2011 */
 407         sdata->mac_params.min_be = 3;
 408         sdata->mac_params.max_be = 5;
 409         sdata->mac_params.csma_retries = 4;
 410         /* for compatibility, actual default is 3 */
 411         sdata->mac_params.frame_retries = -1;
 412
 413         sdata->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
 414         sdata->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
 415
 416         switch (type) {
 417         case IEEE802154_DEV_WPAN:
 418                 sdata->dev->header_ops = &mac802154_header_ops;
 419                 sdata->dev->destructor = mac802154_wpan_free;
 420                 sdata->dev->netdev_ops = &mac802154_wpan_ops;
 421                 sdata->dev->ml_priv = &mac802154_mlme_wpan;
 422                 sdata->promisuous_mode = false;
 423
 424                 spin_lock_init(&sdata->mib_lock);
 425                 mutex_init(&sdata->sec_mtx);
 426
 427                 mac802154_llsec_init(&sdata->sec);
 428                 break;
 429         case IEEE802154_DEV_MONITOR:
 430                 sdata->dev->destructor = free_netdev;
 431                 sdata->dev->netdev_ops = &mac802154_monitor_ops;
 432                 sdata->promisuous_mode = true;
 433                 break;
 434         default:
 435                 BUG();
 436         }
 437
 438         return 0;
 439 }
 440
 441 struct net_device *
 442 ieee802154_if_add(struct ieee802154_local *local, const char *name,
 443                   struct wpan_dev **new_wpan_dev, int type)
 444 {
 445         struct net_device *ndev = NULL;
 446         struct ieee802154_sub_if_data *sdata = NULL;
 447         int ret = -ENOMEM;
 448
 449         ASSERT_RTNL();
 450
 451         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, name,
 452                             NET_NAME_UNKNOWN, ieee802154_if_setup);
 453         if (!ndev)
 454                 return ERR_PTR(-ENOMEM);
 455
 456         ndev->needed_headroom = local->hw.extra_tx_headroom;
 457
 458         ret = dev_alloc_name(ndev, ndev->name);
 459         if (ret < 0)
 460                 goto err;
 461
 462         switch (type) {
 463         case IEEE802154_DEV_WPAN:
 464                 ndev->type = ARPHRD_IEEE802154;
 465                 break;
 466         case IEEE802154_DEV_MONITOR:
 467                 ndev->type = ARPHRD_IEEE802154_MONITOR;
 468                 break;
 469         default:
 470                 ret = -EINVAL;
 471                 goto err;
 472         }
 473
 474         /* TODO check this */
 475         SET_NETDEV_DEV(ndev, &local->phy->dev);
 476         sdata = netdev_priv(ndev);
 477         ndev->ieee802154_ptr = &sdata->wpan_dev;
 478         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 479         sdata->dev = ndev;
 480         sdata->wpan_dev.wpan_phy = local->hw.phy;
 481         sdata->local = local;
 482
 483         /* setup type-dependent data */
 484         ret = ieee802154_setup_sdata(sdata, type);
 485         if (ret)
 486                 goto err;
 487
 488         if (ndev) {
 489                 ret = register_netdevice(ndev);
 490                 if (ret < 0)
 491                         goto err;
 492         }
 493
 494         mutex_lock(&local->iflist_mtx);
 495         list_add_tail_rcu(&sdata->list, &local->interfaces);
 496         mutex_unlock(&local->iflist_mtx);
 497
 498         if (new_wpan_dev)
 499                 *new_wpan_dev = &sdata->wpan_dev;
 500
 501         return ndev;
 502
 503 err:
 504         free_netdev(ndev);
 505         return ERR_PTR(ret);
 506 }
 507
 508 void ieee802154_if_remove(struct ieee802154_sub_if_data *sdata)
 509 {
 510         ASSERT_RTNL();
 511
 512         mutex_lock(&sdata->local->iflist_mtx);
 513         list_del_rcu(&sdata->list);
 514         mutex_unlock(&sdata->local->iflist_mtx);
 515
 516         synchronize_rcu();
 517         unregister_netdevice(sdata->dev);
 518 }