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
 116         if (netif_running(dev))
 117                 return -EBUSY;
 118
 119         /* FIXME: validate addr */
 120         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 121         sdata->extended_addr = ieee802154_netdev_to_extended_addr(dev->dev_addr);
 122
 123         return mac802154_wpan_update_llsec(dev);
 124 }
 125
 126 int mac802154_set_mac_params(struct net_device *dev,
 127                              const struct ieee802154_mac_params *params)
 128 {
 129         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 130
 131         mutex_lock(&sdata->local->iflist_mtx);
 132         sdata->mac_params = *params;
 133         mutex_unlock(&sdata->local->iflist_mtx);
 134
 135         return 0;
 136 }
 137
 138 void mac802154_get_mac_params(struct net_device *dev,
 139                               struct ieee802154_mac_params *params)
 140 {
 141         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 142
 143         mutex_lock(&sdata->local->iflist_mtx);
 144         *params = sdata->mac_params;
 145         mutex_unlock(&sdata->local->iflist_mtx);
 146 }
 147
 148 static int mac802154_slave_open(struct net_device *dev)
 149 {
 150         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 151         struct ieee802154_sub_if_data *subif;
 152         struct ieee802154_local *local = sdata->local;
 153         int res = 0;
 154
 155         ASSERT_RTNL();
 156
 157         if (sdata->type == IEEE802154_DEV_WPAN) {
 158                 mutex_lock(&sdata->local->iflist_mtx);
 159                 list_for_each_entry(subif, &sdata->local->interfaces, list) {
 160                         if (subif != sdata && subif->type == sdata->type &&
 161                             ieee802154_sdata_running(subif)) {
 162                                 mutex_unlock(&sdata->local->iflist_mtx);
 163                                 return -EBUSY;
 164                         }
 165                 }
 166                 mutex_unlock(&sdata->local->iflist_mtx);
 167         }
 168
 169         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 170
 171         if (!local->open_count) {
 172                 res = drv_start(local);
 173                 WARN_ON(res);
 174                 if (res)
 175                         goto err;
 176         }
 177
 178         local->open_count++;
 179         netif_start_queue(dev);
 180         return 0;
 181 err:
 182         /* might already be clear but that doesn't matter */
 183         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 184
 185         return res;
 186 }
 187
 188 static int mac802154_wpan_open(struct net_device *dev)
 189 {
 190         int rc;
 191         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 192         struct ieee802154_local *local = sdata->local;
 193         struct wpan_phy *phy = sdata->local->phy;
 194
 195         rc = mac802154_slave_open(dev);
 196         if (rc < 0)
 197                 return rc;
 198
 199         mutex_lock(&phy->pib_lock);
 200
 201         if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
 202                 rc = drv_set_promiscuous_mode(local, sdata->promisuous_mode);
 203                 if (rc < 0)
 204                         goto out;
 205         }
 206
 207         if (local->hw.flags & IEEE802154_HW_AFILT) {
 208                 rc = drv_set_extended_addr(local, sdata->extended_addr);
 209                 if (rc < 0)
 210                         goto out;
 211
 212                 rc = drv_set_short_addr(local, sdata->short_addr);
 213                 if (rc < 0)
 214                         goto out;
 215         }
 216
 217         if (local->hw.flags & IEEE802154_HW_TXPOWER) {
 218                 rc = drv_set_tx_power(local, sdata->mac_params.transmit_power);
 219                 if (rc < 0)
 220                         goto out;
 221         }
 222
 223         if (local->hw.flags & IEEE802154_HW_LBT) {
 224                 rc = drv_set_lbt_mode(local, sdata->mac_params.lbt);
 225                 if (rc < 0)
 226                         goto out;
 227         }
 228
 229         if (local->hw.flags & IEEE802154_HW_CCA_MODE) {
 230                 rc = drv_set_cca_mode(local, sdata->mac_params.cca_mode);
 231                 if (rc < 0)
 232                         goto out;
 233         }
 234
 235         if (local->hw.flags & IEEE802154_HW_CCA_ED_LEVEL) {
 236                 rc = drv_set_cca_ed_level(local,
 237                                           sdata->mac_params.cca_ed_level);
 238                 if (rc < 0)
 239                         goto out;
 240         }
 241
 242         if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
 243                 rc = drv_set_csma_params(local, sdata->mac_params.min_be,
 244                                          sdata->mac_params.max_be,
 245                                          sdata->mac_params.csma_retries);
 246                 if (rc < 0)
 247                         goto out;
 248         }
 249
 250         if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
 251                 rc = drv_set_max_frame_retries(local,
 252                                                sdata->mac_params.frame_retries);
 253                 if (rc < 0)
 254                         goto out;
 255         }
 256
 257         mutex_unlock(&phy->pib_lock);
 258         return 0;
 259
 260 out:
 261         mutex_unlock(&phy->pib_lock);
 262         return rc;
 263 }
 264
 265 static int mac802154_slave_close(struct net_device *dev)
 266 {
 267         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 268         struct ieee802154_local *local = sdata->local;
 269
 270         ASSERT_RTNL();
 271
 272         netif_stop_queue(dev);
 273         local->open_count--;
 274
 275         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 276
 277         if (!local->open_count)
 278                 drv_stop(local);
 279
 280         return 0;
 281 }
 282
 283 static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
 284                                          struct ieee802154_hdr *hdr,
 285                                          const struct ieee802154_mac_cb *cb)
 286 {
 287         struct ieee802154_llsec_params params;
 288         u8 level;
 289
 290         mac802154_llsec_get_params(&sdata->sec, &params);
 291
 292         if (!params.enabled && cb->secen_override && cb->secen)
 293                 return -EINVAL;
 294         if (!params.enabled ||
 295             (cb->secen_override && !cb->secen) ||
 296             !params.out_level)
 297                 return 0;
 298         if (cb->seclevel_override && !cb->seclevel)
 299                 return -EINVAL;
 300
 301         level = cb->seclevel_override ? cb->seclevel : params.out_level;
 302
 303         hdr->fc.security_enabled = 1;
 304         hdr->sec.level = level;
 305         hdr->sec.key_id_mode = params.out_key.mode;
 306         if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
 307                 hdr->sec.short_src = params.out_key.short_source;
 308         else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
 309                 hdr->sec.extended_src = params.out_key.extended_source;
 310         hdr->sec.key_id = params.out_key.id;
 311
 312         return 0;
 313 }
 314
 315 static int mac802154_header_create(struct sk_buff *skb,
 316                                    struct net_device *dev,
 317                                    unsigned short type,
 318                                    const void *daddr,
 319                                    const void *saddr,
 320                                    unsigned len)
 321 {
 322         struct ieee802154_hdr hdr;
 323         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 324         struct ieee802154_mac_cb *cb = mac_cb(skb);
 325         int hlen;
 326
 327         if (!daddr)
 328                 return -EINVAL;
 329
 330         memset(&hdr.fc, 0, sizeof(hdr.fc));
 331         hdr.fc.type = cb->type;
 332         hdr.fc.security_enabled = cb->secen;
 333         hdr.fc.ack_request = cb->ackreq;
 334         hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
 335
 336         if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
 337                 return -EINVAL;
 338
 339         if (!saddr) {
 340                 spin_lock_bh(&sdata->mib_lock);
 341
 342                 if (sdata->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
 343                     sdata->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
 344                     sdata->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
 345                         hdr.source.mode = IEEE802154_ADDR_LONG;
 346                         hdr.source.extended_addr = sdata->extended_addr;
 347                 } else {
 348                         hdr.source.mode = IEEE802154_ADDR_SHORT;
 349                         hdr.source.short_addr = sdata->short_addr;
 350                 }
 351
 352                 hdr.source.pan_id = sdata->pan_id;
 353
 354                 spin_unlock_bh(&sdata->mib_lock);
 355         } else {
 356                 hdr.source = *(const struct ieee802154_addr *)saddr;
 357         }
 358
 359         hdr.dest = *(const struct ieee802154_addr *)daddr;
 360
 361         hlen = ieee802154_hdr_push(skb, &hdr);
 362         if (hlen < 0)
 363                 return -EINVAL;
 364
 365         skb_reset_mac_header(skb);
 366         skb->mac_len = hlen;
 367
 368         if (len > ieee802154_max_payload(&hdr))
 369                 return -EMSGSIZE;
 370
 371         return hlen;
 372 }
 373
 374 static int
 375 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 376 {
 377         struct ieee802154_hdr hdr;
 378         struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
 379
 380         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
 381                 pr_debug("malformed packet\n");
 382                 return 0;
 383         }
 384
 385         *addr = hdr.source;
 386         return sizeof(*addr);
 387 }
 388
 389 static struct header_ops mac802154_header_ops = {
 390         .create         = mac802154_header_create,
 391         .parse          = mac802154_header_parse,
 392 };
 393
 394 static const struct net_device_ops mac802154_wpan_ops = {
 395         .ndo_open               = mac802154_wpan_open,
 396         .ndo_stop               = mac802154_slave_close,
 397         .ndo_start_xmit         = ieee802154_subif_start_xmit,
 398         .ndo_do_ioctl           = mac802154_wpan_ioctl,
 399         .ndo_set_mac_address    = mac802154_wpan_mac_addr,
 400 };
 401
 402 static const struct net_device_ops mac802154_monitor_ops = {
 403         .ndo_open               = mac802154_wpan_open,
 404         .ndo_stop               = mac802154_slave_close,
 405         .ndo_start_xmit         = ieee802154_monitor_start_xmit,
 406 };
 407
 408 static void mac802154_wpan_free(struct net_device *dev)
 409 {
 410         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 411
 412         mac802154_llsec_destroy(&sdata->sec);
 413
 414         free_netdev(dev);
 415 }
 416
 417 void mac802154_wpan_setup(struct net_device *dev)
 418 {
 419         struct ieee802154_sub_if_data *sdata;
 420
 421         dev->addr_len           = IEEE802154_ADDR_LEN;
 422         memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
 423
 424         dev->hard_header_len    = MAC802154_FRAME_HARD_HEADER_LEN;
 425         dev->header_ops         = &mac802154_header_ops;
 426         dev->needed_tailroom    = 2 + 16; /* FCS + MIC */
 427         dev->mtu                = IEEE802154_MTU;
 428         dev->tx_queue_len       = 300;
 429         dev->type               = ARPHRD_IEEE802154;
 430         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 431
 432         dev->destructor         = mac802154_wpan_free;
 433         dev->netdev_ops         = &mac802154_wpan_ops;
 434         dev->ml_priv            = &mac802154_mlme_wpan;
 435
 436         sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 437         sdata->type = IEEE802154_DEV_WPAN;
 438
 439         spin_lock_init(&sdata->mib_lock);
 440         mutex_init(&sdata->sec_mtx);
 441
 442         get_random_bytes(&sdata->bsn, 1);
 443         get_random_bytes(&sdata->dsn, 1);
 444
 445         /* defaults per 802.15.4-2011 */
 446         sdata->mac_params.min_be = 3;
 447         sdata->mac_params.max_be = 5;
 448         sdata->mac_params.csma_retries = 4;
 449         /* for compatibility, actual default is 3 */
 450         sdata->mac_params.frame_retries = -1;
 451
 452         sdata->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
 453         sdata->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
 454
 455         sdata->promisuous_mode = false;
 456
 457         mac802154_llsec_init(&sdata->sec);
 458 }
 459
 460 void mac802154_monitor_setup(struct net_device *dev)
 461 {
 462         struct ieee802154_sub_if_data *sdata;
 463
 464         dev->needed_tailroom    = 2; /* room for FCS */
 465         dev->mtu                = IEEE802154_MTU;
 466         dev->tx_queue_len       = 10;
 467         dev->type               = ARPHRD_IEEE802154_MONITOR;
 468         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 469
 470         dev->destructor         = free_netdev;
 471         dev->netdev_ops         = &mac802154_monitor_ops;
 472         dev->ml_priv            = &mac802154_mlme_reduced;
 473
 474         sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 475         sdata->type = IEEE802154_DEV_MONITOR;
 476
 477         sdata->promisuous_mode = true;
 478 }