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
  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         int rc = 0;
  39
  40         if (ops->llsec) {
  41                 struct ieee802154_llsec_params params;
  42                 int changed = 0;
  43
  44                 params.pan_id = sdata->pan_id;
  45                 changed |= IEEE802154_LLSEC_PARAM_PAN_ID;
  46
  47                 params.hwaddr = sdata->extended_addr;
  48                 changed |= IEEE802154_LLSEC_PARAM_HWADDR;
  49
  50                 rc = ops->llsec->set_params(dev, &params, changed);
  51         }
  52
  53         return rc;
  54 }
  55
  56 static int
  57 mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
  58 {
  59         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
  60         struct sockaddr_ieee802154 *sa =
  61                 (struct sockaddr_ieee802154 *)&ifr->ifr_addr;
  62         int err = -ENOIOCTLCMD;
  63
  64         spin_lock_bh(&sdata->mib_lock);
  65
  66         switch (cmd) {
  67         case SIOCGIFADDR:
  68         {
  69                 u16 pan_id, short_addr;
  70
  71                 pan_id = le16_to_cpu(sdata->pan_id);
  72                 short_addr = le16_to_cpu(sdata->short_addr);
  73                 if (pan_id == IEEE802154_PANID_BROADCAST ||
  74                     short_addr == IEEE802154_ADDR_BROADCAST) {
  75                         err = -EADDRNOTAVAIL;
  76                         break;
  77                 }
  78
  79                 sa->family = AF_IEEE802154;
  80                 sa->addr.addr_type = IEEE802154_ADDR_SHORT;
  81                 sa->addr.pan_id = pan_id;
  82                 sa->addr.short_addr = short_addr;
  83
  84                 err = 0;
  85                 break;
  86         }
  87         case SIOCSIFADDR:
  88                 dev_warn(&dev->dev,
  89                          "Using DEBUGing ioctl SIOCSIFADDR isn't recommended!\n");
  90                 if (sa->family != AF_IEEE802154 ||
  91                     sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
  92                     sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
  93                     sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
  94                     sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
  95                         err = -EINVAL;
  96                         break;
  97                 }
  98
  99                 sdata->pan_id = cpu_to_le16(sa->addr.pan_id);
 100                 sdata->short_addr = cpu_to_le16(sa->addr.short_addr);
 101
 102                 err = mac802154_wpan_update_llsec(dev);
 103                 break;
 104         }
 105
 106         spin_unlock_bh(&sdata->mib_lock);
 107         return err;
 108 }
 109
 110 static int mac802154_wpan_mac_addr(struct net_device *dev, void *p)
 111 {
 112         struct sockaddr *addr = p;
 113
 114         if (netif_running(dev))
 115                 return -EBUSY;
 116
 117         /* FIXME: validate addr */
 118         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 119         mac802154_dev_set_ieee_addr(dev);
 120         return mac802154_wpan_update_llsec(dev);
 121 }
 122
 123 int mac802154_set_mac_params(struct net_device *dev,
 124                              const struct ieee802154_mac_params *params)
 125 {
 126         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 127
 128         mutex_lock(&sdata->local->iflist_mtx);
 129         sdata->mac_params = *params;
 130         mutex_unlock(&sdata->local->iflist_mtx);
 131
 132         return 0;
 133 }
 134
 135 void mac802154_get_mac_params(struct net_device *dev,
 136                               struct ieee802154_mac_params *params)
 137 {
 138         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 139
 140         mutex_lock(&sdata->local->iflist_mtx);
 141         *params = sdata->mac_params;
 142         mutex_unlock(&sdata->local->iflist_mtx);
 143 }
 144
 145 static int mac802154_slave_open(struct net_device *dev)
 146 {
 147         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 148         struct ieee802154_sub_if_data *subif;
 149         struct ieee802154_local *local = sdata->local;
 150         int res = 0;
 151
 152         ASSERT_RTNL();
 153
 154         if (sdata->type == IEEE802154_DEV_WPAN) {
 155                 mutex_lock(&sdata->local->iflist_mtx);
 156                 list_for_each_entry(subif, &sdata->local->interfaces, list) {
 157                         if (subif != sdata && subif->type == sdata->type &&
 158                             subif->running) {
 159                                 mutex_unlock(&sdata->local->iflist_mtx);
 160                                 return -EBUSY;
 161                         }
 162                 }
 163                 mutex_unlock(&sdata->local->iflist_mtx);
 164         }
 165
 166         mutex_lock(&sdata->local->iflist_mtx);
 167         sdata->running = true;
 168         mutex_unlock(&sdata->local->iflist_mtx);
 169
 170         if (local->open_count++ == 0) {
 171                 res = local->ops->start(&local->hw);
 172                 WARN_ON(res);
 173                 if (res)
 174                         goto err;
 175         }
 176
 177         netif_start_queue(dev);
 178         return 0;
 179 err:
 180         sdata->local->open_count--;
 181
 182         return res;
 183 }
 184
 185 static int mac802154_wpan_open(struct net_device *dev)
 186 {
 187         int rc;
 188         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 189         struct wpan_phy *phy = sdata->local->phy;
 190
 191         rc = mac802154_slave_open(dev);
 192         if (rc < 0)
 193                 return rc;
 194
 195         mutex_lock(&phy->pib_lock);
 196
 197         if (phy->set_txpower) {
 198                 rc = phy->set_txpower(phy, sdata->mac_params.transmit_power);
 199                 if (rc < 0)
 200                         goto out;
 201         }
 202
 203         if (phy->set_lbt) {
 204                 rc = phy->set_lbt(phy, sdata->mac_params.lbt);
 205                 if (rc < 0)
 206                         goto out;
 207         }
 208
 209         if (phy->set_cca_mode) {
 210                 rc = phy->set_cca_mode(phy, sdata->mac_params.cca_mode);
 211                 if (rc < 0)
 212                         goto out;
 213         }
 214
 215         if (phy->set_cca_ed_level) {
 216                 rc = phy->set_cca_ed_level(phy, sdata->mac_params.cca_ed_level);
 217                 if (rc < 0)
 218                         goto out;
 219         }
 220
 221         if (phy->set_csma_params) {
 222                 rc = phy->set_csma_params(phy, sdata->mac_params.min_be,
 223                                           sdata->mac_params.max_be,
 224                                           sdata->mac_params.csma_retries);
 225                 if (rc < 0)
 226                         goto out;
 227         }
 228
 229         if (phy->set_frame_retries) {
 230                 rc = phy->set_frame_retries(phy,
 231                                             sdata->mac_params.frame_retries);
 232                 if (rc < 0)
 233                         goto out;
 234         }
 235
 236         mutex_unlock(&phy->pib_lock);
 237         return 0;
 238
 239 out:
 240         mutex_unlock(&phy->pib_lock);
 241         return rc;
 242 }
 243
 244 static int mac802154_slave_close(struct net_device *dev)
 245 {
 246         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 247         struct ieee802154_local *local = sdata->local;
 248
 249         ASSERT_RTNL();
 250
 251         netif_stop_queue(dev);
 252
 253         mutex_lock(&sdata->local->iflist_mtx);
 254         sdata->running = false;
 255         mutex_unlock(&sdata->local->iflist_mtx);
 256
 257         if (!--local->open_count)
 258                 local->ops->stop(&local->hw);
 259
 260         return 0;
 261 }
 262
 263 static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
 264                                          struct ieee802154_hdr *hdr,
 265                                          const struct ieee802154_mac_cb *cb)
 266 {
 267         struct ieee802154_llsec_params params;
 268         u8 level;
 269
 270         mac802154_llsec_get_params(&sdata->sec, &params);
 271
 272         if (!params.enabled && cb->secen_override && cb->secen)
 273                 return -EINVAL;
 274         if (!params.enabled ||
 275             (cb->secen_override && !cb->secen) ||
 276             !params.out_level)
 277                 return 0;
 278         if (cb->seclevel_override && !cb->seclevel)
 279                 return -EINVAL;
 280
 281         level = cb->seclevel_override ? cb->seclevel : params.out_level;
 282
 283         hdr->fc.security_enabled = 1;
 284         hdr->sec.level = level;
 285         hdr->sec.key_id_mode = params.out_key.mode;
 286         if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
 287                 hdr->sec.short_src = params.out_key.short_source;
 288         else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
 289                 hdr->sec.extended_src = params.out_key.extended_source;
 290         hdr->sec.key_id = params.out_key.id;
 291
 292         return 0;
 293 }
 294
 295 static int mac802154_header_create(struct sk_buff *skb,
 296                                    struct net_device *dev,
 297                                    unsigned short type,
 298                                    const void *daddr,
 299                                    const void *saddr,
 300                                    unsigned len)
 301 {
 302         struct ieee802154_hdr hdr;
 303         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 304         struct ieee802154_mac_cb *cb = mac_cb(skb);
 305         int hlen;
 306
 307         if (!daddr)
 308                 return -EINVAL;
 309
 310         memset(&hdr.fc, 0, sizeof(hdr.fc));
 311         hdr.fc.type = cb->type;
 312         hdr.fc.security_enabled = cb->secen;
 313         hdr.fc.ack_request = cb->ackreq;
 314         hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
 315
 316         if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
 317                 return -EINVAL;
 318
 319         if (!saddr) {
 320                 spin_lock_bh(&sdata->mib_lock);
 321
 322                 if (sdata->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
 323                     sdata->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
 324                     sdata->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
 325                         hdr.source.mode = IEEE802154_ADDR_LONG;
 326                         hdr.source.extended_addr = sdata->extended_addr;
 327                 } else {
 328                         hdr.source.mode = IEEE802154_ADDR_SHORT;
 329                         hdr.source.short_addr = sdata->short_addr;
 330                 }
 331
 332                 hdr.source.pan_id = sdata->pan_id;
 333
 334                 spin_unlock_bh(&sdata->mib_lock);
 335         } else {
 336                 hdr.source = *(const struct ieee802154_addr *)saddr;
 337         }
 338
 339         hdr.dest = *(const struct ieee802154_addr *)daddr;
 340
 341         hlen = ieee802154_hdr_push(skb, &hdr);
 342         if (hlen < 0)
 343                 return -EINVAL;
 344
 345         skb_reset_mac_header(skb);
 346         skb->mac_len = hlen;
 347
 348         if (len > ieee802154_max_payload(&hdr))
 349                 return -EMSGSIZE;
 350
 351         return hlen;
 352 }
 353
 354 static int
 355 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 356 {
 357         struct ieee802154_hdr hdr;
 358         struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
 359
 360         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
 361                 pr_debug("malformed packet\n");
 362                 return 0;
 363         }
 364
 365         *addr = hdr.source;
 366         return sizeof(*addr);
 367 }
 368
 369 static struct header_ops mac802154_header_ops = {
 370         .create         = mac802154_header_create,
 371         .parse          = mac802154_header_parse,
 372 };
 373
 374 static const struct net_device_ops mac802154_wpan_ops = {
 375         .ndo_open               = mac802154_wpan_open,
 376         .ndo_stop               = mac802154_slave_close,
 377         .ndo_start_xmit         = ieee802154_subif_start_xmit,
 378         .ndo_do_ioctl           = mac802154_wpan_ioctl,
 379         .ndo_set_mac_address    = mac802154_wpan_mac_addr,
 380 };
 381
 382 static const struct net_device_ops mac802154_monitor_ops = {
 383         .ndo_open               = mac802154_slave_open,
 384         .ndo_stop               = mac802154_slave_close,
 385         .ndo_start_xmit         = ieee802154_monitor_start_xmit,
 386 };
 387
 388 static void mac802154_wpan_free(struct net_device *dev)
 389 {
 390         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 391
 392         mac802154_llsec_destroy(&sdata->sec);
 393
 394         free_netdev(dev);
 395 }
 396
 397 void mac802154_wpan_setup(struct net_device *dev)
 398 {
 399         struct ieee802154_sub_if_data *sdata;
 400
 401         dev->addr_len           = IEEE802154_ADDR_LEN;
 402         memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
 403
 404         dev->hard_header_len    = MAC802154_FRAME_HARD_HEADER_LEN;
 405         dev->header_ops         = &mac802154_header_ops;
 406         dev->needed_tailroom    = 2 + 16; /* FCS + MIC */
 407         dev->mtu                = IEEE802154_MTU;
 408         dev->tx_queue_len       = 300;
 409         dev->type               = ARPHRD_IEEE802154;
 410         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 411         dev->watchdog_timeo     = 0;
 412
 413         dev->destructor         = mac802154_wpan_free;
 414         dev->netdev_ops         = &mac802154_wpan_ops;
 415         dev->ml_priv            = &mac802154_mlme_wpan;
 416
 417         sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 418         sdata->type = IEEE802154_DEV_WPAN;
 419
 420         sdata->chan = MAC802154_CHAN_NONE;
 421         sdata->page = 0;
 422
 423         spin_lock_init(&sdata->mib_lock);
 424         mutex_init(&sdata->sec_mtx);
 425
 426         get_random_bytes(&sdata->bsn, 1);
 427         get_random_bytes(&sdata->dsn, 1);
 428
 429         /* defaults per 802.15.4-2011 */
 430         sdata->mac_params.min_be = 3;
 431         sdata->mac_params.max_be = 5;
 432         sdata->mac_params.csma_retries = 4;
 433         /* for compatibility, actual default is 3 */
 434         sdata->mac_params.frame_retries = -1;
 435
 436         sdata->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
 437         sdata->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
 438
 439         mac802154_llsec_init(&sdata->sec);
 440 }
 441
 442 void mac802154_monitor_setup(struct net_device *dev)
 443 {
 444         struct ieee802154_sub_if_data *sdata;
 445
 446         dev->addr_len           = 0;
 447         dev->hard_header_len    = 0;
 448         dev->needed_tailroom    = 2; /* room for FCS */
 449         dev->mtu                = IEEE802154_MTU;
 450         dev->tx_queue_len       = 10;
 451         dev->type               = ARPHRD_IEEE802154_MONITOR;
 452         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 453         dev->watchdog_timeo     = 0;
 454
 455         dev->destructor         = free_netdev;
 456         dev->netdev_ops         = &mac802154_monitor_ops;
 457         dev->ml_priv            = &mac802154_mlme_reduced;
 458
 459         sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 460         sdata->type = IEEE802154_DEV_MONITOR;
 461
 462         sdata->chan = MAC802154_CHAN_NONE; /* not initialized */
 463         sdata->page = 0;
 464 }