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         extended_addr = ieee802154_netdev_to_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->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 && subif->type == sdata->type &&
 143                             ieee802154_sdata_running(subif)) {
 144                                 mutex_unlock(&sdata->local->iflist_mtx);
 145                                 return -EBUSY;
 146                         }
 147                 }
 148                 mutex_unlock(&sdata->local->iflist_mtx);
 149         }
 150
 151         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 152
 153         if (!local->open_count) {
 154                 res = drv_start(local);
 155                 WARN_ON(res);
 156                 if (res)
 157                         goto err;
 158         }
 159
 160         local->open_count++;
 161         netif_start_queue(dev);
 162         return 0;
 163 err:
 164         /* might already be clear but that doesn't matter */
 165         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 166
 167         return res;
 168 }
 169
 170 static int mac802154_wpan_open(struct net_device *dev)
 171 {
 172         int rc;
 173         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 174         struct ieee802154_local *local = sdata->local;
 175         struct wpan_phy *phy = sdata->local->phy;
 176
 177         rc = mac802154_slave_open(dev);
 178         if (rc < 0)
 179                 return rc;
 180
 181         mutex_lock(&phy->pib_lock);
 182
 183         if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
 184                 rc = drv_set_promiscuous_mode(local, sdata->promisuous_mode);
 185                 if (rc < 0)
 186                         goto out;
 187         }
 188
 189         if (local->hw.flags & IEEE802154_HW_AFILT) {
 190                 rc = drv_set_pan_id(local, sdata->pan_id);
 191                 if (rc < 0)
 192                         goto out;
 193
 194                 rc = drv_set_extended_addr(local, sdata->extended_addr);
 195                 if (rc < 0)
 196                         goto out;
 197
 198                 rc = drv_set_short_addr(local, sdata->short_addr);
 199                 if (rc < 0)
 200                         goto out;
 201         }
 202
 203         if (local->hw.flags & IEEE802154_HW_LBT) {
 204                 rc = drv_set_lbt_mode(local, sdata->mac_params.lbt);
 205                 if (rc < 0)
 206                         goto out;
 207         }
 208
 209         if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
 210                 rc = drv_set_csma_params(local, sdata->mac_params.min_be,
 211                                          sdata->mac_params.max_be,
 212                                          sdata->mac_params.csma_retries);
 213                 if (rc < 0)
 214                         goto out;
 215         }
 216
 217         if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
 218                 rc = drv_set_max_frame_retries(local,
 219                                                sdata->mac_params.frame_retries);
 220                 if (rc < 0)
 221                         goto out;
 222         }
 223
 224         mutex_unlock(&phy->pib_lock);
 225         return 0;
 226
 227 out:
 228         mutex_unlock(&phy->pib_lock);
 229         return rc;
 230 }
 231
 232 static int mac802154_slave_close(struct net_device *dev)
 233 {
 234         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 235         struct ieee802154_local *local = sdata->local;
 236
 237         ASSERT_RTNL();
 238
 239         netif_stop_queue(dev);
 240         local->open_count--;
 241
 242         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 243
 244         if (!local->open_count)
 245                 drv_stop(local);
 246
 247         return 0;
 248 }
 249
 250 static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
 251                                          struct ieee802154_hdr *hdr,
 252                                          const struct ieee802154_mac_cb *cb)
 253 {
 254         struct ieee802154_llsec_params params;
 255         u8 level;
 256
 257         mac802154_llsec_get_params(&sdata->sec, &params);
 258
 259         if (!params.enabled && cb->secen_override && cb->secen)
 260                 return -EINVAL;
 261         if (!params.enabled ||
 262             (cb->secen_override && !cb->secen) ||
 263             !params.out_level)
 264                 return 0;
 265         if (cb->seclevel_override && !cb->seclevel)
 266                 return -EINVAL;
 267
 268         level = cb->seclevel_override ? cb->seclevel : params.out_level;
 269
 270         hdr->fc.security_enabled = 1;
 271         hdr->sec.level = level;
 272         hdr->sec.key_id_mode = params.out_key.mode;
 273         if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
 274                 hdr->sec.short_src = params.out_key.short_source;
 275         else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
 276                 hdr->sec.extended_src = params.out_key.extended_source;
 277         hdr->sec.key_id = params.out_key.id;
 278
 279         return 0;
 280 }
 281
 282 static int mac802154_header_create(struct sk_buff *skb,
 283                                    struct net_device *dev,
 284                                    unsigned short type,
 285                                    const void *daddr,
 286                                    const void *saddr,
 287                                    unsigned len)
 288 {
 289         struct ieee802154_hdr hdr;
 290         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 291         struct ieee802154_mac_cb *cb = mac_cb(skb);
 292         int hlen;
 293
 294         if (!daddr)
 295                 return -EINVAL;
 296
 297         memset(&hdr.fc, 0, sizeof(hdr.fc));
 298         hdr.fc.type = cb->type;
 299         hdr.fc.security_enabled = cb->secen;
 300         hdr.fc.ack_request = cb->ackreq;
 301         hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
 302
 303         if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
 304                 return -EINVAL;
 305
 306         if (!saddr) {
 307                 spin_lock_bh(&sdata->mib_lock);
 308
 309                 if (sdata->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
 310                     sdata->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
 311                     sdata->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
 312                         hdr.source.mode = IEEE802154_ADDR_LONG;
 313                         hdr.source.extended_addr = sdata->extended_addr;
 314                 } else {
 315                         hdr.source.mode = IEEE802154_ADDR_SHORT;
 316                         hdr.source.short_addr = sdata->short_addr;
 317                 }
 318
 319                 hdr.source.pan_id = sdata->pan_id;
 320
 321                 spin_unlock_bh(&sdata->mib_lock);
 322         } else {
 323                 hdr.source = *(const struct ieee802154_addr *)saddr;
 324         }
 325
 326         hdr.dest = *(const struct ieee802154_addr *)daddr;
 327
 328         hlen = ieee802154_hdr_push(skb, &hdr);
 329         if (hlen < 0)
 330                 return -EINVAL;
 331
 332         skb_reset_mac_header(skb);
 333         skb->mac_len = hlen;
 334
 335         if (len > ieee802154_max_payload(&hdr))
 336                 return -EMSGSIZE;
 337
 338         return hlen;
 339 }
 340
 341 static int
 342 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 343 {
 344         struct ieee802154_hdr hdr;
 345         struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
 346
 347         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
 348                 pr_debug("malformed packet\n");
 349                 return 0;
 350         }
 351
 352         *addr = hdr.source;
 353         return sizeof(*addr);
 354 }
 355
 356 static struct header_ops mac802154_header_ops = {
 357         .create         = mac802154_header_create,
 358         .parse          = mac802154_header_parse,
 359 };
 360
 361 static const struct net_device_ops mac802154_wpan_ops = {
 362         .ndo_open               = mac802154_wpan_open,
 363         .ndo_stop               = mac802154_slave_close,
 364         .ndo_start_xmit         = ieee802154_subif_start_xmit,
 365         .ndo_do_ioctl           = mac802154_wpan_ioctl,
 366         .ndo_set_mac_address    = mac802154_wpan_mac_addr,
 367 };
 368
 369 static const struct net_device_ops mac802154_monitor_ops = {
 370         .ndo_open               = mac802154_wpan_open,
 371         .ndo_stop               = mac802154_slave_close,
 372         .ndo_start_xmit         = ieee802154_monitor_start_xmit,
 373 };
 374
 375 static void mac802154_wpan_free(struct net_device *dev)
 376 {
 377         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 378
 379         mac802154_llsec_destroy(&sdata->sec);
 380
 381         free_netdev(dev);
 382 }
 383
 384 void mac802154_wpan_setup(struct net_device *dev)
 385 {
 386         struct ieee802154_sub_if_data *sdata;
 387
 388         dev->addr_len           = IEEE802154_ADDR_LEN;
 389         memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
 390
 391         dev->hard_header_len    = MAC802154_FRAME_HARD_HEADER_LEN;
 392         dev->header_ops         = &mac802154_header_ops;
 393         dev->needed_tailroom    = 2 + 16; /* FCS + MIC */
 394         dev->mtu                = IEEE802154_MTU;
 395         dev->tx_queue_len       = 300;
 396         dev->type               = ARPHRD_IEEE802154;
 397         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 398
 399         dev->destructor         = mac802154_wpan_free;
 400         dev->netdev_ops         = &mac802154_wpan_ops;
 401         dev->ml_priv            = &mac802154_mlme_wpan;
 402
 403         sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 404         sdata->type = IEEE802154_DEV_WPAN;
 405
 406         spin_lock_init(&sdata->mib_lock);
 407         mutex_init(&sdata->sec_mtx);
 408
 409         get_random_bytes(&sdata->bsn, 1);
 410         get_random_bytes(&sdata->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         sdata->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
 420         sdata->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
 421
 422         sdata->promisuous_mode = false;
 423
 424         mac802154_llsec_init(&sdata->sec);
 425 }
 426
 427 void mac802154_monitor_setup(struct net_device *dev)
 428 {
 429         struct ieee802154_sub_if_data *sdata;
 430
 431         dev->needed_tailroom    = 2; /* room for FCS */
 432         dev->mtu                = IEEE802154_MTU;
 433         dev->tx_queue_len       = 10;
 434         dev->type               = ARPHRD_IEEE802154_MONITOR;
 435         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 436
 437         dev->destructor         = free_netdev;
 438         dev->netdev_ops         = &mac802154_monitor_ops;
 439         dev->ml_priv            = &mac802154_mlme_reduced;
 440
 441         sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 442         sdata->type = IEEE802154_DEV_MONITOR;
 443
 444         sdata->promisuous_mode = true;
 445 }
 446
 447 static int
 448 mac802154_netdev_register(struct ieee802154_local *local,
 449                           struct net_device *dev)
 450 {
 451         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 452         int err;
 453
 454         sdata->dev = dev;
 455         sdata->local = local;
 456
 457         dev->needed_headroom = local->hw.extra_tx_headroom;
 458
 459         SET_NETDEV_DEV(dev, &local->phy->dev);
 460
 461         err = register_netdev(dev);
 462         if (err < 0)
 463                 return err;
 464
 465         rtnl_lock();
 466         mutex_lock(&local->iflist_mtx);
 467         list_add_tail_rcu(&sdata->list, &local->interfaces);
 468         mutex_unlock(&local->iflist_mtx);
 469         rtnl_unlock();
 470
 471         return 0;
 472 }
 473
 474 struct net_device *
 475 ieee802154_if_add(struct ieee802154_local *local, const char *name,
 476                   struct wpan_dev **new_wpan_dev, int type)
 477 {
 478         struct net_device *dev;
 479         int err = -ENOMEM;
 480
 481         switch (type) {
 482         case IEEE802154_DEV_MONITOR:
 483                 dev = alloc_netdev(sizeof(struct ieee802154_sub_if_data),
 484                                    name, NET_NAME_UNKNOWN,
 485                                    mac802154_monitor_setup);
 486                 break;
 487         case IEEE802154_DEV_WPAN:
 488                 dev = alloc_netdev(sizeof(struct ieee802154_sub_if_data),
 489                                    name, NET_NAME_UNKNOWN,
 490                                    mac802154_wpan_setup);
 491                 break;
 492         default:
 493                 dev = NULL;
 494                 err = -EINVAL;
 495                 break;
 496         }
 497         if (!dev)
 498                 goto err;
 499
 500         err = mac802154_netdev_register(local, dev);
 501         if (err)
 502                 goto err_free;
 503
 504         dev_hold(dev); /* we return an incremented device refcount */
 505         return dev;
 506
 507 err_free:
 508         free_netdev(dev);
 509 err:
 510         return ERR_PTR(err);
 511 }
 512
 513 void ieee802154_if_remove(struct ieee802154_sub_if_data *sdata)
 514 {
 515         ASSERT_RTNL();
 516
 517         mutex_lock(&sdata->local->iflist_mtx);
 518         list_del_rcu(&sdata->list);
 519         mutex_unlock(&sdata->local->iflist_mtx);
 520
 521         synchronize_rcu();
 522         unregister_netdevice(sdata->dev);
 523 }