net/mac802154/wpan.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  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  *
  17  * Written by:
  18  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  19  * Sergey Lapin <slapin@ossfans.org>
  20  * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
  21  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
  22  */
  23
  24 #include <linux/netdevice.h>
  25 #include <linux/module.h>
  26 #include <linux/if_arp.h>
  27
  28 #include <net/rtnetlink.h>
  29 #include <linux/nl802154.h>
  30 #include <net/af_ieee802154.h>
  31 #include <net/mac802154.h>
  32 #include <net/ieee802154_netdev.h>
  33 #include <net/ieee802154.h>
  34 #include <net/wpan-phy.h>
  35
  36 #include "mac802154.h"
  37
  38 static int mac802154_wpan_update_llsec(struct net_device *dev)
  39 {
  40         struct mac802154_sub_if_data *priv = netdev_priv(dev);
  41         struct ieee802154_mlme_ops *ops = ieee802154_mlme_ops(dev);
  42         int rc = 0;
  43
  44         if (ops->llsec) {
  45                 struct ieee802154_llsec_params params;
  46                 int changed = 0;
  47
  48                 params.pan_id = priv->pan_id;
  49                 changed |= IEEE802154_LLSEC_PARAM_PAN_ID;
  50
  51                 params.hwaddr = priv->extended_addr;
  52                 changed |= IEEE802154_LLSEC_PARAM_HWADDR;
  53
  54                 rc = ops->llsec->set_params(dev, &params, changed);
  55         }
  56
  57         return rc;
  58 }
  59
  60 static int
  61 mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
  62 {
  63         struct mac802154_sub_if_data *priv = netdev_priv(dev);
  64         struct sockaddr_ieee802154 *sa =
  65                 (struct sockaddr_ieee802154 *)&ifr->ifr_addr;
  66         int err = -ENOIOCTLCMD;
  67
  68         spin_lock_bh(&priv->mib_lock);
  69
  70         switch (cmd) {
  71         case SIOCGIFADDR:
  72         {
  73                 u16 pan_id, short_addr;
  74
  75                 pan_id = le16_to_cpu(priv->pan_id);
  76                 short_addr = le16_to_cpu(priv->short_addr);
  77                 if (pan_id == IEEE802154_PANID_BROADCAST ||
  78                     short_addr == IEEE802154_ADDR_BROADCAST) {
  79                         err = -EADDRNOTAVAIL;
  80                         break;
  81                 }
  82
  83                 sa->family = AF_IEEE802154;
  84                 sa->addr.addr_type = IEEE802154_ADDR_SHORT;
  85                 sa->addr.pan_id = pan_id;
  86                 sa->addr.short_addr = short_addr;
  87
  88                 err = 0;
  89                 break;
  90         }
  91         case SIOCSIFADDR:
  92                 dev_warn(&dev->dev,
  93                          "Using DEBUGing ioctl SIOCSIFADDR isn't recommended!\n");
  94                 if (sa->family != AF_IEEE802154 ||
  95                     sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
  96                     sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
  97                     sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
  98                     sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
  99                         err = -EINVAL;
 100                         break;
 101                 }
 102
 103                 priv->pan_id = cpu_to_le16(sa->addr.pan_id);
 104                 priv->short_addr = cpu_to_le16(sa->addr.short_addr);
 105
 106                 err = mac802154_wpan_update_llsec(dev);
 107                 break;
 108         }
 109
 110         spin_unlock_bh(&priv->mib_lock);
 111         return err;
 112 }
 113
 114 static int mac802154_wpan_mac_addr(struct net_device *dev, void *p)
 115 {
 116         struct sockaddr *addr = p;
 117
 118         if (netif_running(dev))
 119                 return -EBUSY;
 120
 121         /* FIXME: validate addr */
 122         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 123         mac802154_dev_set_ieee_addr(dev);
 124         return mac802154_wpan_update_llsec(dev);
 125 }
 126
 127 int mac802154_set_mac_params(struct net_device *dev,
 128                              const struct ieee802154_mac_params *params)
 129 {
 130         struct mac802154_sub_if_data *priv = netdev_priv(dev);
 131
 132         mutex_lock(&priv->hw->slaves_mtx);
 133         priv->mac_params = *params;
 134         mutex_unlock(&priv->hw->slaves_mtx);
 135
 136         return 0;
 137 }
 138
 139 void mac802154_get_mac_params(struct net_device *dev,
 140                               struct ieee802154_mac_params *params)
 141 {
 142         struct mac802154_sub_if_data *priv = netdev_priv(dev);
 143
 144         mutex_lock(&priv->hw->slaves_mtx);
 145         *params = priv->mac_params;
 146         mutex_unlock(&priv->hw->slaves_mtx);
 147 }
 148
 149 static int mac802154_wpan_open(struct net_device *dev)
 150 {
 151         int rc;
 152         struct mac802154_sub_if_data *priv = netdev_priv(dev);
 153         struct wpan_phy *phy = priv->hw->phy;
 154
 155         rc = mac802154_slave_open(dev);
 156         if (rc < 0)
 157                 return rc;
 158
 159         mutex_lock(&phy->pib_lock);
 160
 161         if (phy->set_txpower) {
 162                 rc = phy->set_txpower(phy, priv->mac_params.transmit_power);
 163                 if (rc < 0)
 164                         goto out;
 165         }
 166
 167         if (phy->set_lbt) {
 168                 rc = phy->set_lbt(phy, priv->mac_params.lbt);
 169                 if (rc < 0)
 170                         goto out;
 171         }
 172
 173         if (phy->set_cca_mode) {
 174                 rc = phy->set_cca_mode(phy, priv->mac_params.cca_mode);
 175                 if (rc < 0)
 176                         goto out;
 177         }
 178
 179         if (phy->set_cca_ed_level) {
 180                 rc = phy->set_cca_ed_level(phy, priv->mac_params.cca_ed_level);
 181                 if (rc < 0)
 182                         goto out;
 183         }
 184
 185         if (phy->set_csma_params) {
 186                 rc = phy->set_csma_params(phy, priv->mac_params.min_be,
 187                                           priv->mac_params.max_be,
 188                                           priv->mac_params.csma_retries);
 189                 if (rc < 0)
 190                         goto out;
 191         }
 192
 193         if (phy->set_frame_retries) {
 194                 rc = phy->set_frame_retries(phy,
 195                                             priv->mac_params.frame_retries);
 196                 if (rc < 0)
 197                         goto out;
 198         }
 199
 200         mutex_unlock(&phy->pib_lock);
 201         return 0;
 202
 203 out:
 204         mutex_unlock(&phy->pib_lock);
 205         return rc;
 206 }
 207
 208 static int mac802154_set_header_security(struct mac802154_sub_if_data *priv,
 209                                          struct ieee802154_hdr *hdr,
 210                                          const struct ieee802154_mac_cb *cb)
 211 {
 212         struct ieee802154_llsec_params params;
 213         u8 level;
 214
 215         mac802154_llsec_get_params(&priv->sec, &params);
 216
 217         if (!params.enabled && cb->secen_override && cb->secen)
 218                 return -EINVAL;
 219         if (!params.enabled ||
 220             (cb->secen_override && !cb->secen) ||
 221             !params.out_level)
 222                 return 0;
 223         if (cb->seclevel_override && !cb->seclevel)
 224                 return -EINVAL;
 225
 226         level = cb->seclevel_override ? cb->seclevel : params.out_level;
 227
 228         hdr->fc.security_enabled = 1;
 229         hdr->sec.level = level;
 230         hdr->sec.key_id_mode = params.out_key.mode;
 231         if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
 232                 hdr->sec.short_src = params.out_key.short_source;
 233         else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
 234                 hdr->sec.extended_src = params.out_key.extended_source;
 235         hdr->sec.key_id = params.out_key.id;
 236
 237         return 0;
 238 }
 239
 240 static int mac802154_header_create(struct sk_buff *skb,
 241                                    struct net_device *dev,
 242                                    unsigned short type,
 243                                    const void *daddr,
 244                                    const void *saddr,
 245                                    unsigned len)
 246 {
 247         struct ieee802154_hdr hdr;
 248         struct mac802154_sub_if_data *priv = netdev_priv(dev);
 249         struct ieee802154_mac_cb *cb = mac_cb(skb);
 250         int hlen;
 251
 252         if (!daddr)
 253                 return -EINVAL;
 254
 255         memset(&hdr.fc, 0, sizeof(hdr.fc));
 256         hdr.fc.type = cb->type;
 257         hdr.fc.security_enabled = cb->secen;
 258         hdr.fc.ack_request = cb->ackreq;
 259         hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
 260
 261         if (mac802154_set_header_security(priv, &hdr, cb) < 0)
 262                 return -EINVAL;
 263
 264         if (!saddr) {
 265                 spin_lock_bh(&priv->mib_lock);
 266
 267                 if (priv->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
 268                     priv->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
 269                     priv->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
 270                         hdr.source.mode = IEEE802154_ADDR_LONG;
 271                         hdr.source.extended_addr = priv->extended_addr;
 272                 } else {
 273                         hdr.source.mode = IEEE802154_ADDR_SHORT;
 274                         hdr.source.short_addr = priv->short_addr;
 275                 }
 276
 277                 hdr.source.pan_id = priv->pan_id;
 278
 279                 spin_unlock_bh(&priv->mib_lock);
 280         } else {
 281                 hdr.source = *(const struct ieee802154_addr *)saddr;
 282         }
 283
 284         hdr.dest = *(const struct ieee802154_addr *)daddr;
 285
 286         hlen = ieee802154_hdr_push(skb, &hdr);
 287         if (hlen < 0)
 288                 return -EINVAL;
 289
 290         skb_reset_mac_header(skb);
 291         skb->mac_len = hlen;
 292
 293         if (len > ieee802154_max_payload(&hdr))
 294                 return -EMSGSIZE;
 295
 296         return hlen;
 297 }
 298
 299 static int
 300 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 301 {
 302         struct ieee802154_hdr hdr;
 303         struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
 304
 305         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
 306                 pr_debug("malformed packet\n");
 307                 return 0;
 308         }
 309
 310         *addr = hdr.source;
 311         return sizeof(*addr);
 312 }
 313
 314 static netdev_tx_t
 315 mac802154_wpan_xmit(struct sk_buff *skb, struct net_device *dev)
 316 {
 317         struct mac802154_sub_if_data *priv;
 318         u8 chan, page;
 319         int rc;
 320
 321         priv = netdev_priv(dev);
 322
 323         spin_lock_bh(&priv->mib_lock);
 324         chan = priv->chan;
 325         page = priv->page;
 326         spin_unlock_bh(&priv->mib_lock);
 327
 328         if (chan == MAC802154_CHAN_NONE ||
 329             page >= WPAN_NUM_PAGES ||
 330             chan >= WPAN_NUM_CHANNELS) {
 331                 kfree_skb(skb);
 332                 return NETDEV_TX_OK;
 333         }
 334
 335         rc = mac802154_llsec_encrypt(&priv->sec, skb);
 336         if (rc) {
 337                 pr_warn("encryption failed: %i\n", rc);
 338                 kfree_skb(skb);
 339                 return NETDEV_TX_OK;
 340         }
 341
 342         skb->skb_iif = dev->ifindex;
 343         dev->stats.tx_packets++;
 344         dev->stats.tx_bytes += skb->len;
 345
 346         return mac802154_tx(priv->hw, skb, page, chan);
 347 }
 348
 349 static struct header_ops mac802154_header_ops = {
 350         .create         = mac802154_header_create,
 351         .parse          = mac802154_header_parse,
 352 };
 353
 354 static const struct net_device_ops mac802154_wpan_ops = {
 355         .ndo_open               = mac802154_wpan_open,
 356         .ndo_stop               = mac802154_slave_close,
 357         .ndo_start_xmit         = mac802154_wpan_xmit,
 358         .ndo_do_ioctl           = mac802154_wpan_ioctl,
 359         .ndo_set_mac_address    = mac802154_wpan_mac_addr,
 360 };
 361
 362 static void mac802154_wpan_free(struct net_device *dev)
 363 {
 364         struct mac802154_sub_if_data *priv = netdev_priv(dev);
 365
 366         mac802154_llsec_destroy(&priv->sec);
 367
 368         free_netdev(dev);
 369 }
 370
 371 void mac802154_wpan_setup(struct net_device *dev)
 372 {
 373         struct mac802154_sub_if_data *priv;
 374
 375         dev->addr_len           = IEEE802154_ADDR_LEN;
 376         memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
 377
 378         dev->hard_header_len    = MAC802154_FRAME_HARD_HEADER_LEN;
 379         dev->header_ops         = &mac802154_header_ops;
 380         dev->needed_tailroom    = 2 + 16; /* FCS + MIC */
 381         dev->mtu                = IEEE802154_MTU;
 382         dev->tx_queue_len       = 300;
 383         dev->type               = ARPHRD_IEEE802154;
 384         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 385         dev->watchdog_timeo     = 0;
 386
 387         dev->destructor         = mac802154_wpan_free;
 388         dev->netdev_ops         = &mac802154_wpan_ops;
 389         dev->ml_priv            = &mac802154_mlme_wpan;
 390
 391         priv = netdev_priv(dev);
 392         priv->type = IEEE802154_DEV_WPAN;
 393
 394         priv->chan = MAC802154_CHAN_NONE;
 395         priv->page = 0;
 396
 397         spin_lock_init(&priv->mib_lock);
 398         mutex_init(&priv->sec_mtx);
 399
 400         get_random_bytes(&priv->bsn, 1);
 401         get_random_bytes(&priv->dsn, 1);
 402
 403         /* defaults per 802.15.4-2011 */
 404         priv->mac_params.min_be = 3;
 405         priv->mac_params.max_be = 5;
 406         priv->mac_params.csma_retries = 4;
 407         priv->mac_params.frame_retries = -1; /* for compatibility, actual default is 3 */
 408
 409         priv->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
 410         priv->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
 411
 412         mac802154_llsec_init(&priv->sec);
 413 }
 414
 415 static int mac802154_process_data(struct net_device *dev, struct sk_buff *skb)
 416 {
 417         return netif_rx_ni(skb);
 418 }
 419
 420 static int
 421 mac802154_subif_frame(struct mac802154_sub_if_data *sdata, struct sk_buff *skb,
 422                       const struct ieee802154_hdr *hdr)
 423 {
 424         __le16 span, sshort;
 425         int rc;
 426
 427         pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
 428
 429         spin_lock_bh(&sdata->mib_lock);
 430
 431         span = sdata->pan_id;
 432         sshort = sdata->short_addr;
 433
 434         switch (mac_cb(skb)->dest.mode) {
 435         case IEEE802154_ADDR_NONE:
 436                 if (mac_cb(skb)->dest.mode != IEEE802154_ADDR_NONE)
 437                         /* FIXME: check if we are PAN coordinator */
 438                         skb->pkt_type = PACKET_OTHERHOST;
 439                 else
 440                         /* ACK comes with both addresses empty */
 441                         skb->pkt_type = PACKET_HOST;
 442                 break;
 443         case IEEE802154_ADDR_LONG:
 444                 if (mac_cb(skb)->dest.pan_id != span &&
 445                     mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
 446                         skb->pkt_type = PACKET_OTHERHOST;
 447                 else if (mac_cb(skb)->dest.extended_addr == sdata->extended_addr)
 448                         skb->pkt_type = PACKET_HOST;
 449                 else
 450                         skb->pkt_type = PACKET_OTHERHOST;
 451                 break;
 452         case IEEE802154_ADDR_SHORT:
 453                 if (mac_cb(skb)->dest.pan_id != span &&
 454                     mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
 455                         skb->pkt_type = PACKET_OTHERHOST;
 456                 else if (mac_cb(skb)->dest.short_addr == sshort)
 457                         skb->pkt_type = PACKET_HOST;
 458                 else if (mac_cb(skb)->dest.short_addr ==
 459                           cpu_to_le16(IEEE802154_ADDR_BROADCAST))
 460                         skb->pkt_type = PACKET_BROADCAST;
 461                 else
 462                         skb->pkt_type = PACKET_OTHERHOST;
 463                 break;
 464         default:
 465                 spin_unlock_bh(&sdata->mib_lock);
 466                 pr_debug("invalid dest mode\n");
 467                 kfree_skb(skb);
 468                 return NET_RX_DROP;
 469         }
 470
 471         spin_unlock_bh(&sdata->mib_lock);
 472
 473         skb->dev = sdata->dev;
 474
 475         rc = mac802154_llsec_decrypt(&sdata->sec, skb);
 476         if (rc) {
 477                 pr_debug("decryption failed: %i\n", rc);
 478                 goto fail;
 479         }
 480
 481         sdata->dev->stats.rx_packets++;
 482         sdata->dev->stats.rx_bytes += skb->len;
 483
 484         switch (mac_cb(skb)->type) {
 485         case IEEE802154_FC_TYPE_DATA:
 486                 return mac802154_process_data(sdata->dev, skb);
 487         default:
 488                 pr_warn("ieee802154: bad frame received (type = %d)\n",
 489                         mac_cb(skb)->type);
 490                 goto fail;
 491         }
 492
 493 fail:
 494         kfree_skb(skb);
 495         return NET_RX_DROP;
 496 }
 497
 498 static void mac802154_print_addr(const char *name,
 499                                  const struct ieee802154_addr *addr)
 500 {
 501         if (addr->mode == IEEE802154_ADDR_NONE)
 502                 pr_debug("%s not present\n", name);
 503
 504         pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id));
 505         if (addr->mode == IEEE802154_ADDR_SHORT) {
 506                 pr_debug("%s is short: %04x\n", name,
 507                          le16_to_cpu(addr->short_addr));
 508         } else {
 509                 u64 hw = swab64((__force u64) addr->extended_addr);
 510
 511                 pr_debug("%s is hardware: %8phC\n", name, &hw);
 512         }
 513 }
 514
 515 static int mac802154_parse_frame_start(struct sk_buff *skb,
 516                                        struct ieee802154_hdr *hdr)
 517 {
 518         int hlen;
 519         struct ieee802154_mac_cb *cb = mac_cb_init(skb);
 520
 521         hlen = ieee802154_hdr_pull(skb, hdr);
 522         if (hlen < 0)
 523                 return -EINVAL;
 524
 525         skb->mac_len = hlen;
 526
 527         pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc),
 528                  hdr->seq);
 529
 530         cb->type = hdr->fc.type;
 531         cb->ackreq = hdr->fc.ack_request;
 532         cb->secen = hdr->fc.security_enabled;
 533
 534         mac802154_print_addr("destination", &hdr->dest);
 535         mac802154_print_addr("source", &hdr->source);
 536
 537         cb->source = hdr->source;
 538         cb->dest = hdr->dest;
 539
 540         if (hdr->fc.security_enabled) {
 541                 u64 key;
 542
 543                 pr_debug("seclevel %i\n", hdr->sec.level);
 544
 545                 switch (hdr->sec.key_id_mode) {
 546                 case IEEE802154_SCF_KEY_IMPLICIT:
 547                         pr_debug("implicit key\n");
 548                         break;
 549
 550                 case IEEE802154_SCF_KEY_INDEX:
 551                         pr_debug("key %02x\n", hdr->sec.key_id);
 552                         break;
 553
 554                 case IEEE802154_SCF_KEY_SHORT_INDEX:
 555                         pr_debug("key %04x:%04x %02x\n",
 556                                  le32_to_cpu(hdr->sec.short_src) >> 16,
 557                                  le32_to_cpu(hdr->sec.short_src) & 0xffff,
 558                                  hdr->sec.key_id);
 559                         break;
 560
 561                 case IEEE802154_SCF_KEY_HW_INDEX:
 562                         key = swab64((__force u64) hdr->sec.extended_src);
 563                         pr_debug("key source %8phC %02x\n", &key,
 564                                  hdr->sec.key_id);
 565                         break;
 566                 }
 567         }
 568
 569         return 0;
 570 }
 571
 572 void mac802154_wpans_rx(struct mac802154_priv *priv, struct sk_buff *skb)
 573 {
 574         int ret;
 575         struct mac802154_sub_if_data *sdata;
 576         struct ieee802154_hdr hdr;
 577
 578         ret = mac802154_parse_frame_start(skb, &hdr);
 579         if (ret) {
 580                 pr_debug("got invalid frame\n");
 581                 kfree_skb(skb);
 582                 return;
 583         }
 584
 585         rcu_read_lock();
 586         list_for_each_entry_rcu(sdata, &priv->slaves, list) {
 587                 if (sdata->type != IEEE802154_DEV_WPAN ||
 588                     !netif_running(sdata->dev))
 589                         continue;
 590
 591                 mac802154_subif_frame(sdata, skb, &hdr);
 592                 skb = NULL;
 593                 break;
 594         }
 595         rcu_read_unlock();
 596
 597         if (skb)
 598                 kfree_skb(skb);
 599 }