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 inline int mac802154_fetch_skb_u8(struct sk_buff *skb, u8 *val)
  39 {
  40         if (unlikely(!pskb_may_pull(skb, 1)))
  41                 return -EINVAL;
  42
  43         *val = skb->data[0];
  44         skb_pull(skb, 1);
  45
  46         return 0;
  47 }
  48
  49 static inline int mac802154_fetch_skb_u16(struct sk_buff *skb, u16 *val)
  50 {
  51         if (unlikely(!pskb_may_pull(skb, 2)))
  52                 return -EINVAL;
  53
  54         *val = skb->data[0] | (skb->data[1] << 8);
  55         skb_pull(skb, 2);
  56
  57         return 0;
  58 }
  59
  60 static inline void mac802154_haddr_copy_swap(u8 *dest, const u8 *src)
  61 {
  62         int i;
  63         for (i = 0; i < IEEE802154_ADDR_LEN; i++)
  64                 dest[IEEE802154_ADDR_LEN - i - 1] = src[i];
  65 }
  66
  67 static int
  68 mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
  69 {
  70         struct mac802154_sub_if_data *priv = netdev_priv(dev);
  71         struct sockaddr_ieee802154 *sa =
  72                 (struct sockaddr_ieee802154 *)&ifr->ifr_addr;
  73         int err = -ENOIOCTLCMD;
  74
  75         spin_lock_bh(&priv->mib_lock);
  76
  77         switch (cmd) {
  78         case SIOCGIFADDR:
  79                 if (priv->pan_id == IEEE802154_PANID_BROADCAST ||
  80                     priv->short_addr == IEEE802154_ADDR_BROADCAST) {
  81                         err = -EADDRNOTAVAIL;
  82                         break;
  83                 }
  84
  85                 sa->family = AF_IEEE802154;
  86                 sa->addr.addr_type = IEEE802154_ADDR_SHORT;
  87                 sa->addr.pan_id = priv->pan_id;
  88                 sa->addr.short_addr = priv->short_addr;
  89
  90                 err = 0;
  91                 break;
  92         case SIOCSIFADDR:
  93                 dev_warn(&dev->dev,
  94                          "Using DEBUGing ioctl SIOCSIFADDR isn't recommened!\n");
  95                 if (sa->family != AF_IEEE802154 ||
  96                     sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
  97                     sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
  98                     sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
  99                     sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
 100                         err = -EINVAL;
 101                         break;
 102                 }
 103
 104                 priv->pan_id = sa->addr.pan_id;
 105                 priv->short_addr = sa->addr.short_addr;
 106
 107                 err = 0;
 108                 break;
 109         }
 110
 111         spin_unlock_bh(&priv->mib_lock);
 112         return err;
 113 }
 114
 115 static int mac802154_wpan_mac_addr(struct net_device *dev, void *p)
 116 {
 117         struct sockaddr *addr = p;
 118
 119         if (netif_running(dev))
 120                 return -EBUSY;
 121
 122         /* FIXME: validate addr */
 123         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 124         mac802154_dev_set_ieee_addr(dev);
 125         return 0;
 126 }
 127
 128 static int mac802154_header_create(struct sk_buff *skb,
 129                                    struct net_device *dev,
 130                                    unsigned short type,
 131                                    const void *_daddr,
 132                                    const void *_saddr,
 133                                    unsigned len)
 134 {
 135         const struct ieee802154_addr *saddr = _saddr;
 136         const struct ieee802154_addr *daddr = _daddr;
 137         struct ieee802154_addr dev_addr;
 138         struct mac802154_sub_if_data *priv = netdev_priv(dev);
 139         int pos = 2;
 140         u8 head[MAC802154_FRAME_HARD_HEADER_LEN];
 141         u16 fc;
 142
 143         if (!daddr)
 144                 return -EINVAL;
 145
 146         head[pos++] = mac_cb(skb)->seq; /* DSN/BSN */
 147         fc = mac_cb_type(skb);
 148
 149         if (!saddr) {
 150                 spin_lock_bh(&priv->mib_lock);
 151
 152                 if (priv->short_addr == IEEE802154_ADDR_BROADCAST ||
 153                     priv->short_addr == IEEE802154_ADDR_UNDEF ||
 154                     priv->pan_id == IEEE802154_PANID_BROADCAST) {
 155                         dev_addr.addr_type = IEEE802154_ADDR_LONG;
 156                         memcpy(dev_addr.hwaddr, dev->dev_addr,
 157                                IEEE802154_ADDR_LEN);
 158                 } else {
 159                         dev_addr.addr_type = IEEE802154_ADDR_SHORT;
 160                         dev_addr.short_addr = priv->short_addr;
 161                 }
 162
 163                 dev_addr.pan_id = priv->pan_id;
 164                 saddr = &dev_addr;
 165
 166                 spin_unlock_bh(&priv->mib_lock);
 167         }
 168
 169         if (daddr->addr_type != IEEE802154_ADDR_NONE) {
 170                 fc |= (daddr->addr_type << IEEE802154_FC_DAMODE_SHIFT);
 171
 172                 head[pos++] = daddr->pan_id & 0xff;
 173                 head[pos++] = daddr->pan_id >> 8;
 174
 175                 if (daddr->addr_type == IEEE802154_ADDR_SHORT) {
 176                         head[pos++] = daddr->short_addr & 0xff;
 177                         head[pos++] = daddr->short_addr >> 8;
 178                 } else {
 179                         mac802154_haddr_copy_swap(head + pos, daddr->hwaddr);
 180                         pos += IEEE802154_ADDR_LEN;
 181                 }
 182         }
 183
 184         if (saddr->addr_type != IEEE802154_ADDR_NONE) {
 185                 fc |= (saddr->addr_type << IEEE802154_FC_SAMODE_SHIFT);
 186
 187                 if ((saddr->pan_id == daddr->pan_id) &&
 188                     (saddr->pan_id != IEEE802154_PANID_BROADCAST)) {
 189                         /* PANID compression/intra PAN */
 190                         fc |= IEEE802154_FC_INTRA_PAN;
 191                 } else {
 192                         head[pos++] = saddr->pan_id & 0xff;
 193                         head[pos++] = saddr->pan_id >> 8;
 194                 }
 195
 196                 if (saddr->addr_type == IEEE802154_ADDR_SHORT) {
 197                         head[pos++] = saddr->short_addr & 0xff;
 198                         head[pos++] = saddr->short_addr >> 8;
 199                 } else {
 200                         mac802154_haddr_copy_swap(head + pos, saddr->hwaddr);
 201                         pos += IEEE802154_ADDR_LEN;
 202                 }
 203         }
 204
 205         head[0] = fc;
 206         head[1] = fc >> 8;
 207
 208         memcpy(skb_push(skb, pos), head, pos);
 209
 210         return pos;
 211 }
 212
 213 static int
 214 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 215 {
 216         const u8 *hdr = skb_mac_header(skb);
 217         const u8 *tail = skb_tail_pointer(skb);
 218         struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
 219         u16 fc;
 220         int da_type;
 221
 222         if (hdr + 3 > tail)
 223                 goto malformed;
 224
 225         fc = hdr[0] | (hdr[1] << 8);
 226
 227         hdr += 3;
 228
 229         da_type = IEEE802154_FC_DAMODE(fc);
 230         addr->addr_type = IEEE802154_FC_SAMODE(fc);
 231
 232         switch (da_type) {
 233         case IEEE802154_ADDR_NONE:
 234                 if (fc & IEEE802154_FC_INTRA_PAN)
 235                         goto malformed;
 236                 break;
 237         case IEEE802154_ADDR_LONG:
 238                 if (fc & IEEE802154_FC_INTRA_PAN) {
 239                         if (hdr + 2 > tail)
 240                                 goto malformed;
 241                         addr->pan_id = hdr[0] | (hdr[1] << 8);
 242                         hdr += 2;
 243                 }
 244
 245                 if (hdr + IEEE802154_ADDR_LEN > tail)
 246                         goto malformed;
 247
 248                 hdr += IEEE802154_ADDR_LEN;
 249                 break;
 250         case IEEE802154_ADDR_SHORT:
 251                 if (fc & IEEE802154_FC_INTRA_PAN) {
 252                         if (hdr + 2 > tail)
 253                                 goto malformed;
 254                         addr->pan_id = hdr[0] | (hdr[1] << 8);
 255                         hdr += 2;
 256                 }
 257
 258                 if (hdr + 2 > tail)
 259                         goto malformed;
 260
 261                 hdr += 2;
 262                 break;
 263         default:
 264                 goto malformed;
 265
 266         }
 267
 268         switch (addr->addr_type) {
 269         case IEEE802154_ADDR_NONE:
 270                 break;
 271         case IEEE802154_ADDR_LONG:
 272                 if (!(fc & IEEE802154_FC_INTRA_PAN)) {
 273                         if (hdr + 2 > tail)
 274                                 goto malformed;
 275                         addr->pan_id = hdr[0] | (hdr[1] << 8);
 276                         hdr += 2;
 277                 }
 278
 279                 if (hdr + IEEE802154_ADDR_LEN > tail)
 280                         goto malformed;
 281
 282                 mac802154_haddr_copy_swap(addr->hwaddr, hdr);
 283                 hdr += IEEE802154_ADDR_LEN;
 284                 break;
 285         case IEEE802154_ADDR_SHORT:
 286                 if (!(fc & IEEE802154_FC_INTRA_PAN)) {
 287                         if (hdr + 2 > tail)
 288                                 goto malformed;
 289                         addr->pan_id = hdr[0] | (hdr[1] << 8);
 290                         hdr += 2;
 291                 }
 292
 293                 if (hdr + 2 > tail)
 294                         goto malformed;
 295
 296                 addr->short_addr = hdr[0] | (hdr[1] << 8);
 297                 hdr += 2;
 298                 break;
 299         default:
 300                 goto malformed;
 301         }
 302
 303         return sizeof(struct ieee802154_addr);
 304
 305 malformed:
 306         pr_debug("malformed packet\n");
 307         return 0;
 308 }
 309
 310 static netdev_tx_t
 311 mac802154_wpan_xmit(struct sk_buff *skb, struct net_device *dev)
 312 {
 313         struct mac802154_sub_if_data *priv;
 314         u8 chan, page;
 315
 316         priv = netdev_priv(dev);
 317
 318         spin_lock_bh(&priv->mib_lock);
 319         chan = priv->chan;
 320         page = priv->page;
 321         spin_unlock_bh(&priv->mib_lock);
 322
 323         if (chan == MAC802154_CHAN_NONE ||
 324             page >= WPAN_NUM_PAGES ||
 325             chan >= WPAN_NUM_CHANNELS) {
 326                 kfree_skb(skb);
 327                 return NETDEV_TX_OK;
 328         }
 329
 330         skb->skb_iif = dev->ifindex;
 331         dev->stats.tx_packets++;
 332         dev->stats.tx_bytes += skb->len;
 333
 334         return mac802154_tx(priv->hw, skb, page, chan);
 335 }
 336
 337 static struct header_ops mac802154_header_ops = {
 338         .create         = mac802154_header_create,
 339         .parse          = mac802154_header_parse,
 340 };
 341
 342 static const struct net_device_ops mac802154_wpan_ops = {
 343         .ndo_open               = mac802154_slave_open,
 344         .ndo_stop               = mac802154_slave_close,
 345         .ndo_start_xmit         = mac802154_wpan_xmit,
 346         .ndo_do_ioctl           = mac802154_wpan_ioctl,
 347         .ndo_set_mac_address    = mac802154_wpan_mac_addr,
 348 };
 349
 350 void mac802154_wpan_setup(struct net_device *dev)
 351 {
 352         struct mac802154_sub_if_data *priv;
 353
 354         dev->addr_len           = IEEE802154_ADDR_LEN;
 355         memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
 356
 357         dev->hard_header_len    = MAC802154_FRAME_HARD_HEADER_LEN;
 358         dev->header_ops         = &mac802154_header_ops;
 359         dev->needed_tailroom    = 2; /* FCS */
 360         dev->mtu                = IEEE802154_MTU;
 361         dev->tx_queue_len       = 10;
 362         dev->type               = ARPHRD_IEEE802154;
 363         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 364         dev->watchdog_timeo     = 0;
 365
 366         dev->destructor         = free_netdev;
 367         dev->netdev_ops         = &mac802154_wpan_ops;
 368         dev->ml_priv            = &mac802154_mlme_wpan;
 369
 370         priv = netdev_priv(dev);
 371         priv->type = IEEE802154_DEV_WPAN;
 372
 373         priv->chan = MAC802154_CHAN_NONE;
 374         priv->page = 0;
 375
 376         spin_lock_init(&priv->mib_lock);
 377
 378         get_random_bytes(&priv->bsn, 1);
 379         get_random_bytes(&priv->dsn, 1);
 380
 381         priv->pan_id = IEEE802154_PANID_BROADCAST;
 382         priv->short_addr = IEEE802154_ADDR_BROADCAST;
 383 }
 384
 385 static int mac802154_process_data(struct net_device *dev, struct sk_buff *skb)
 386 {
 387         return netif_rx_ni(skb);
 388 }
 389
 390 static int
 391 mac802154_subif_frame(struct mac802154_sub_if_data *sdata, struct sk_buff *skb)
 392 {
 393         pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
 394
 395         spin_lock_bh(&sdata->mib_lock);
 396
 397         switch (mac_cb(skb)->da.addr_type) {
 398         case IEEE802154_ADDR_NONE:
 399                 if (mac_cb(skb)->sa.addr_type != IEEE802154_ADDR_NONE)
 400                         /* FIXME: check if we are PAN coordinator */
 401                         skb->pkt_type = PACKET_OTHERHOST;
 402                 else
 403                         /* ACK comes with both addresses empty */
 404                         skb->pkt_type = PACKET_HOST;
 405                 break;
 406         case IEEE802154_ADDR_LONG:
 407                 if (mac_cb(skb)->da.pan_id != sdata->pan_id &&
 408                     mac_cb(skb)->da.pan_id != IEEE802154_PANID_BROADCAST)
 409                         skb->pkt_type = PACKET_OTHERHOST;
 410                 else if (!memcmp(mac_cb(skb)->da.hwaddr, sdata->dev->dev_addr,
 411                                  IEEE802154_ADDR_LEN))
 412                         skb->pkt_type = PACKET_HOST;
 413                 else
 414                         skb->pkt_type = PACKET_OTHERHOST;
 415                 break;
 416         case IEEE802154_ADDR_SHORT:
 417                 if (mac_cb(skb)->da.pan_id != sdata->pan_id &&
 418                     mac_cb(skb)->da.pan_id != IEEE802154_PANID_BROADCAST)
 419                         skb->pkt_type = PACKET_OTHERHOST;
 420                 else if (mac_cb(skb)->da.short_addr == sdata->short_addr)
 421                         skb->pkt_type = PACKET_HOST;
 422                 else if (mac_cb(skb)->da.short_addr ==
 423                                         IEEE802154_ADDR_BROADCAST)
 424                         skb->pkt_type = PACKET_BROADCAST;
 425                 else
 426                         skb->pkt_type = PACKET_OTHERHOST;
 427                 break;
 428         default:
 429                 break;
 430         }
 431
 432         spin_unlock_bh(&sdata->mib_lock);
 433
 434         skb->dev = sdata->dev;
 435
 436         sdata->dev->stats.rx_packets++;
 437         sdata->dev->stats.rx_bytes += skb->len;
 438
 439         switch (mac_cb_type(skb)) {
 440         case IEEE802154_FC_TYPE_DATA:
 441                 return mac802154_process_data(sdata->dev, skb);
 442         default:
 443                 pr_warning("ieee802154: bad frame received (type = %d)\n",
 444                            mac_cb_type(skb));
 445                 kfree_skb(skb);
 446                 return NET_RX_DROP;
 447         }
 448 }
 449
 450 static int mac802154_parse_frame_start(struct sk_buff *skb)
 451 {
 452         u8 *head = skb->data;
 453         u16 fc;
 454
 455         if (mac802154_fetch_skb_u16(skb, &fc) ||
 456             mac802154_fetch_skb_u8(skb, &(mac_cb(skb)->seq)))
 457                 goto err;
 458
 459         pr_debug("fc: %04x dsn: %02x\n", fc, head[2]);
 460
 461         mac_cb(skb)->flags = IEEE802154_FC_TYPE(fc);
 462         mac_cb(skb)->sa.addr_type = IEEE802154_FC_SAMODE(fc);
 463         mac_cb(skb)->da.addr_type = IEEE802154_FC_DAMODE(fc);
 464
 465         if (fc & IEEE802154_FC_INTRA_PAN)
 466                 mac_cb(skb)->flags |= MAC_CB_FLAG_INTRAPAN;
 467
 468         if (mac_cb(skb)->da.addr_type != IEEE802154_ADDR_NONE) {
 469                 if (mac802154_fetch_skb_u16(skb, &(mac_cb(skb)->da.pan_id)))
 470                         goto err;
 471
 472                 /* source PAN id compression */
 473                 if (mac_cb_is_intrapan(skb))
 474                         mac_cb(skb)->sa.pan_id = mac_cb(skb)->da.pan_id;
 475
 476                 pr_debug("dest PAN addr: %04x\n", mac_cb(skb)->da.pan_id);
 477
 478                 if (mac_cb(skb)->da.addr_type == IEEE802154_ADDR_SHORT) {
 479                         u16 *da = &(mac_cb(skb)->da.short_addr);
 480
 481                         if (mac802154_fetch_skb_u16(skb, da))
 482                                 goto err;
 483
 484                         pr_debug("destination address is short: %04x\n",
 485                                  mac_cb(skb)->da.short_addr);
 486                 } else {
 487                         if (!pskb_may_pull(skb, IEEE802154_ADDR_LEN))
 488                                 goto err;
 489
 490                         mac802154_haddr_copy_swap(mac_cb(skb)->da.hwaddr,
 491                                                   skb->data);
 492                         skb_pull(skb, IEEE802154_ADDR_LEN);
 493
 494                         pr_debug("destination address is hardware\n");
 495                 }
 496         }
 497
 498         if (mac_cb(skb)->sa.addr_type != IEEE802154_ADDR_NONE) {
 499                 /* non PAN-compression, fetch source address id */
 500                 if (!(mac_cb_is_intrapan(skb))) {
 501                         u16 *sa_pan = &(mac_cb(skb)->sa.pan_id);
 502
 503                         if (mac802154_fetch_skb_u16(skb, sa_pan))
 504                                 goto err;
 505                 }
 506
 507                 pr_debug("source PAN addr: %04x\n", mac_cb(skb)->da.pan_id);
 508
 509                 if (mac_cb(skb)->sa.addr_type == IEEE802154_ADDR_SHORT) {
 510                         u16 *sa = &(mac_cb(skb)->sa.short_addr);
 511
 512                         if (mac802154_fetch_skb_u16(skb, sa))
 513                                 goto err;
 514
 515                         pr_debug("source address is short: %04x\n",
 516                                  mac_cb(skb)->sa.short_addr);
 517                 } else {
 518                         if (!pskb_may_pull(skb, IEEE802154_ADDR_LEN))
 519                                 goto err;
 520
 521                         mac802154_haddr_copy_swap(mac_cb(skb)->sa.hwaddr,
 522                                                   skb->data);
 523                         skb_pull(skb, IEEE802154_ADDR_LEN);
 524
 525                         pr_debug("source address is hardware\n");
 526                 }
 527         }
 528
 529         return 0;
 530 err:
 531         return -EINVAL;
 532 }
 533
 534 void mac802154_wpans_rx(struct mac802154_priv *priv, struct sk_buff *skb)
 535 {
 536         int ret;
 537         struct sk_buff *sskb;
 538         struct mac802154_sub_if_data *sdata;
 539
 540         ret = mac802154_parse_frame_start(skb);
 541         if (ret) {
 542                 pr_debug("got invalid frame\n");
 543                 return;
 544         }
 545
 546         rcu_read_lock();
 547         list_for_each_entry_rcu(sdata, &priv->slaves, list) {
 548                 if (sdata->type != IEEE802154_DEV_WPAN)
 549                         continue;
 550
 551                 sskb = skb_clone(skb, GFP_ATOMIC);
 552                 if (sskb)
 553                         mac802154_subif_frame(sdata, sskb);
 554         }
 555         rcu_read_unlock();
 556 }