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 sockaddr *addr = p;
 114
 115         if (netif_running(dev))
 116                 return -EBUSY;
 117
 118         /* FIXME: validate addr */
 119         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 120         mac802154_dev_set_ieee_addr(dev);
 121         return mac802154_wpan_update_llsec(dev);
 122 }
 123
 124 int mac802154_set_mac_params(struct net_device *dev,
 125                              const struct ieee802154_mac_params *params)
 126 {
 127         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 128
 129         mutex_lock(&sdata->local->iflist_mtx);
 130         sdata->mac_params = *params;
 131         mutex_unlock(&sdata->local->iflist_mtx);
 132
 133         return 0;
 134 }
 135
 136 void mac802154_get_mac_params(struct net_device *dev,
 137                               struct ieee802154_mac_params *params)
 138 {
 139         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 140
 141         mutex_lock(&sdata->local->iflist_mtx);
 142         *params = sdata->mac_params;
 143         mutex_unlock(&sdata->local->iflist_mtx);
 144 }
 145
 146 static int mac802154_slave_open(struct net_device *dev)
 147 {
 148         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 149         struct ieee802154_sub_if_data *subif;
 150         struct ieee802154_local *local = sdata->local;
 151         int res = 0;
 152
 153         ASSERT_RTNL();
 154
 155         if (sdata->type == IEEE802154_DEV_WPAN) {
 156                 mutex_lock(&sdata->local->iflist_mtx);
 157                 list_for_each_entry(subif, &sdata->local->interfaces, list) {
 158                         if (subif != sdata && subif->type == sdata->type &&
 159                             ieee802154_sdata_running(subif)) {
 160                                 mutex_unlock(&sdata->local->iflist_mtx);
 161                                 return -EBUSY;
 162                         }
 163                 }
 164                 mutex_unlock(&sdata->local->iflist_mtx);
 165         }
 166
 167         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 168
 169         if (local->open_count++ == 0) {
 170                 res = drv_start(local);
 171                 WARN_ON(res);
 172                 if (res)
 173                         goto err;
 174         }
 175
 176         netif_start_queue(dev);
 177         return 0;
 178 err:
 179         /* might already be clear but that doesn't matter */
 180         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 181         sdata->local->open_count--;
 182
 183         return res;
 184 }
 185
 186 static int mac802154_wpan_open(struct net_device *dev)
 187 {
 188         int rc;
 189         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 190         struct ieee802154_local *local = sdata->local;
 191         struct wpan_phy *phy = sdata->local->phy;
 192
 193         rc = mac802154_slave_open(dev);
 194         if (rc < 0)
 195                 return rc;
 196
 197         mutex_lock(&phy->pib_lock);
 198
 199         if (local->hw.flags & IEEE802154_HW_TXPOWER) {
 200                 rc = drv_set_tx_power(local, sdata->mac_params.transmit_power);
 201                 if (rc < 0)
 202                         goto out;
 203         }
 204
 205         if (local->hw.flags & IEEE802154_HW_LBT) {
 206                 rc = drv_set_lbt_mode(local, sdata->mac_params.lbt);
 207                 if (rc < 0)
 208                         goto out;
 209         }
 210
 211         if (local->hw.flags & IEEE802154_HW_CCA_MODE) {
 212                 rc = drv_set_cca_mode(local, sdata->mac_params.cca_mode);
 213                 if (rc < 0)
 214                         goto out;
 215         }
 216
 217         if (local->hw.flags & IEEE802154_HW_CCA_ED_LEVEL) {
 218                 rc = drv_set_cca_ed_level(local,
 219                                           sdata->mac_params.cca_ed_level);
 220                 if (rc < 0)
 221                         goto out;
 222         }
 223
 224         if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
 225                 rc = drv_set_csma_params(local, sdata->mac_params.min_be,
 226                                          sdata->mac_params.max_be,
 227                                          sdata->mac_params.csma_retries);
 228                 if (rc < 0)
 229                         goto out;
 230         }
 231
 232         if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
 233                 rc = drv_set_max_frame_retries(local,
 234                                                sdata->mac_params.frame_retries);
 235                 if (rc < 0)
 236                         goto out;
 237         }
 238
 239         mutex_unlock(&phy->pib_lock);
 240         return 0;
 241
 242 out:
 243         mutex_unlock(&phy->pib_lock);
 244         return rc;
 245 }
 246
 247 static int mac802154_slave_close(struct net_device *dev)
 248 {
 249         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 250         struct ieee802154_local *local = sdata->local;
 251
 252         ASSERT_RTNL();
 253
 254         netif_stop_queue(dev);
 255
 256         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 257
 258         if (!--local->open_count)
 259                 drv_stop(local);
 260
 261         return 0;
 262 }
 263
 264 static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
 265                                          struct ieee802154_hdr *hdr,
 266                                          const struct ieee802154_mac_cb *cb)
 267 {
 268         struct ieee802154_llsec_params params;
 269         u8 level;
 270
 271         mac802154_llsec_get_params(&sdata->sec, &params);
 272
 273         if (!params.enabled && cb->secen_override && cb->secen)
 274                 return -EINVAL;
 275         if (!params.enabled ||
 276             (cb->secen_override && !cb->secen) ||
 277             !params.out_level)
 278                 return 0;
 279         if (cb->seclevel_override && !cb->seclevel)
 280                 return -EINVAL;
 281
 282         level = cb->seclevel_override ? cb->seclevel : params.out_level;
 283
 284         hdr->fc.security_enabled = 1;
 285         hdr->sec.level = level;
 286         hdr->sec.key_id_mode = params.out_key.mode;
 287         if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
 288                 hdr->sec.short_src = params.out_key.short_source;
 289         else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
 290                 hdr->sec.extended_src = params.out_key.extended_source;
 291         hdr->sec.key_id = params.out_key.id;
 292
 293         return 0;
 294 }
 295
 296 static int mac802154_header_create(struct sk_buff *skb,
 297                                    struct net_device *dev,
 298                                    unsigned short type,
 299                                    const void *daddr,
 300                                    const void *saddr,
 301                                    unsigned len)
 302 {
 303         struct ieee802154_hdr hdr;
 304         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 305         struct ieee802154_mac_cb *cb = mac_cb(skb);
 306         int hlen;
 307
 308         if (!daddr)
 309                 return -EINVAL;
 310
 311         memset(&hdr.fc, 0, sizeof(hdr.fc));
 312         hdr.fc.type = cb->type;
 313         hdr.fc.security_enabled = cb->secen;
 314         hdr.fc.ack_request = cb->ackreq;
 315         hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
 316
 317         if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
 318                 return -EINVAL;
 319
 320         if (!saddr) {
 321                 spin_lock_bh(&sdata->mib_lock);
 322
 323                 if (sdata->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
 324                     sdata->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
 325                     sdata->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
 326                         hdr.source.mode = IEEE802154_ADDR_LONG;
 327                         hdr.source.extended_addr = sdata->extended_addr;
 328                 } else {
 329                         hdr.source.mode = IEEE802154_ADDR_SHORT;
 330                         hdr.source.short_addr = sdata->short_addr;
 331                 }
 332
 333                 hdr.source.pan_id = sdata->pan_id;
 334
 335                 spin_unlock_bh(&sdata->mib_lock);
 336         } else {
 337                 hdr.source = *(const struct ieee802154_addr *)saddr;
 338         }
 339
 340         hdr.dest = *(const struct ieee802154_addr *)daddr;
 341
 342         hlen = ieee802154_hdr_push(skb, &hdr);
 343         if (hlen < 0)
 344                 return -EINVAL;
 345
 346         skb_reset_mac_header(skb);
 347         skb->mac_len = hlen;
 348
 349         if (len > ieee802154_max_payload(&hdr))
 350                 return -EMSGSIZE;
 351
 352         return hlen;
 353 }
 354
 355 static int
 356 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 357 {
 358         struct ieee802154_hdr hdr;
 359         struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
 360
 361         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
 362                 pr_debug("malformed packet\n");
 363                 return 0;
 364         }
 365
 366         *addr = hdr.source;
 367         return sizeof(*addr);
 368 }
 369
 370 static struct header_ops mac802154_header_ops = {
 371         .create         = mac802154_header_create,
 372         .parse          = mac802154_header_parse,
 373 };
 374
 375 static const struct net_device_ops mac802154_wpan_ops = {
 376         .ndo_open               = mac802154_wpan_open,
 377         .ndo_stop               = mac802154_slave_close,
 378         .ndo_start_xmit         = ieee802154_subif_start_xmit,
 379         .ndo_do_ioctl           = mac802154_wpan_ioctl,
 380         .ndo_set_mac_address    = mac802154_wpan_mac_addr,
 381 };
 382
 383 static const struct net_device_ops mac802154_monitor_ops = {
 384         .ndo_open               = mac802154_slave_open,
 385         .ndo_stop               = mac802154_slave_close,
 386         .ndo_start_xmit         = ieee802154_monitor_start_xmit,
 387 };
 388
 389 static void mac802154_wpan_free(struct net_device *dev)
 390 {
 391         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 392
 393         mac802154_llsec_destroy(&sdata->sec);
 394
 395         free_netdev(dev);
 396 }
 397
 398 void mac802154_wpan_setup(struct net_device *dev)
 399 {
 400         struct ieee802154_sub_if_data *sdata;
 401
 402         dev->addr_len           = IEEE802154_ADDR_LEN;
 403         memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
 404
 405         dev->hard_header_len    = MAC802154_FRAME_HARD_HEADER_LEN;
 406         dev->header_ops         = &mac802154_header_ops;
 407         dev->needed_tailroom    = 2 + 16; /* FCS + MIC */
 408         dev->mtu                = IEEE802154_MTU;
 409         dev->tx_queue_len       = 300;
 410         dev->type               = ARPHRD_IEEE802154;
 411         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 412         dev->watchdog_timeo     = 0;
 413
 414         dev->destructor         = mac802154_wpan_free;
 415         dev->netdev_ops         = &mac802154_wpan_ops;
 416         dev->ml_priv            = &mac802154_mlme_wpan;
 417
 418         sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 419         sdata->type = IEEE802154_DEV_WPAN;
 420
 421         sdata->chan = MAC802154_CHAN_NONE;
 422         sdata->page = 0;
 423
 424         spin_lock_init(&sdata->mib_lock);
 425         mutex_init(&sdata->sec_mtx);
 426
 427         get_random_bytes(&sdata->bsn, 1);
 428         get_random_bytes(&sdata->dsn, 1);
 429
 430         /* defaults per 802.15.4-2011 */
 431         sdata->mac_params.min_be = 3;
 432         sdata->mac_params.max_be = 5;
 433         sdata->mac_params.csma_retries = 4;
 434         /* for compatibility, actual default is 3 */
 435         sdata->mac_params.frame_retries = -1;
 436
 437         sdata->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
 438         sdata->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
 439
 440         mac802154_llsec_init(&sdata->sec);
 441 }
 442
 443 void mac802154_monitor_setup(struct net_device *dev)
 444 {
 445         struct ieee802154_sub_if_data *sdata;
 446
 447         dev->addr_len           = 0;
 448         dev->hard_header_len    = 0;
 449         dev->needed_tailroom    = 2; /* room for FCS */
 450         dev->mtu                = IEEE802154_MTU;
 451         dev->tx_queue_len       = 10;
 452         dev->type               = ARPHRD_IEEE802154_MONITOR;
 453         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 454         dev->watchdog_timeo     = 0;
 455
 456         dev->destructor         = free_netdev;
 457         dev->netdev_ops         = &mac802154_monitor_ops;
 458         dev->ml_priv            = &mac802154_mlme_reduced;
 459
 460         sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 461         sdata->type = IEEE802154_DEV_MONITOR;
 462
 463         sdata->chan = MAC802154_CHAN_NONE; /* not initialized */
 464         sdata->page = 0;
 465 }