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