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 = netdev_priv(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 = netdev_priv(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 = netdev_priv(dev);
 127
 128         mutex_lock(&sdata->local->slaves_mtx);
 129         sdata->mac_params = *params;
 130         mutex_unlock(&sdata->local->slaves_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 = netdev_priv(dev);
 139
 140         mutex_lock(&sdata->local->slaves_mtx);
 141         *params = sdata->mac_params;
 142         mutex_unlock(&sdata->local->slaves_mtx);
 143 }
 144
 145 static int mac802154_wpan_open(struct net_device *dev)
 146 {
 147         int rc;
 148         struct ieee802154_sub_if_data *sdata = netdev_priv(dev);
 149         struct wpan_phy *phy = sdata->local->phy;
 150
 151         rc = mac802154_slave_open(dev);
 152         if (rc < 0)
 153                 return rc;
 154
 155         mutex_lock(&phy->pib_lock);
 156
 157         if (phy->set_txpower) {
 158                 rc = phy->set_txpower(phy, sdata->mac_params.transmit_power);
 159                 if (rc < 0)
 160                         goto out;
 161         }
 162
 163         if (phy->set_lbt) {
 164                 rc = phy->set_lbt(phy, sdata->mac_params.lbt);
 165                 if (rc < 0)
 166                         goto out;
 167         }
 168
 169         if (phy->set_cca_mode) {
 170                 rc = phy->set_cca_mode(phy, sdata->mac_params.cca_mode);
 171                 if (rc < 0)
 172                         goto out;
 173         }
 174
 175         if (phy->set_cca_ed_level) {
 176                 rc = phy->set_cca_ed_level(phy, sdata->mac_params.cca_ed_level);
 177                 if (rc < 0)
 178                         goto out;
 179         }
 180
 181         if (phy->set_csma_params) {
 182                 rc = phy->set_csma_params(phy, sdata->mac_params.min_be,
 183                                           sdata->mac_params.max_be,
 184                                           sdata->mac_params.csma_retries);
 185                 if (rc < 0)
 186                         goto out;
 187         }
 188
 189         if (phy->set_frame_retries) {
 190                 rc = phy->set_frame_retries(phy,
 191                                             sdata->mac_params.frame_retries);
 192                 if (rc < 0)
 193                         goto out;
 194         }
 195
 196         mutex_unlock(&phy->pib_lock);
 197         return 0;
 198
 199 out:
 200         mutex_unlock(&phy->pib_lock);
 201         return rc;
 202 }
 203
 204 static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
 205                                          struct ieee802154_hdr *hdr,
 206                                          const struct ieee802154_mac_cb *cb)
 207 {
 208         struct ieee802154_llsec_params params;
 209         u8 level;
 210
 211         mac802154_llsec_get_params(&sdata->sec, &params);
 212
 213         if (!params.enabled && cb->secen_override && cb->secen)
 214                 return -EINVAL;
 215         if (!params.enabled ||
 216             (cb->secen_override && !cb->secen) ||
 217             !params.out_level)
 218                 return 0;
 219         if (cb->seclevel_override && !cb->seclevel)
 220                 return -EINVAL;
 221
 222         level = cb->seclevel_override ? cb->seclevel : params.out_level;
 223
 224         hdr->fc.security_enabled = 1;
 225         hdr->sec.level = level;
 226         hdr->sec.key_id_mode = params.out_key.mode;
 227         if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
 228                 hdr->sec.short_src = params.out_key.short_source;
 229         else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
 230                 hdr->sec.extended_src = params.out_key.extended_source;
 231         hdr->sec.key_id = params.out_key.id;
 232
 233         return 0;
 234 }
 235
 236 static int mac802154_header_create(struct sk_buff *skb,
 237                                    struct net_device *dev,
 238                                    unsigned short type,
 239                                    const void *daddr,
 240                                    const void *saddr,
 241                                    unsigned len)
 242 {
 243         struct ieee802154_hdr hdr;
 244         struct ieee802154_sub_if_data *sdata = netdev_priv(dev);
 245         struct ieee802154_mac_cb *cb = mac_cb(skb);
 246         int hlen;
 247
 248         if (!daddr)
 249                 return -EINVAL;
 250
 251         memset(&hdr.fc, 0, sizeof(hdr.fc));
 252         hdr.fc.type = cb->type;
 253         hdr.fc.security_enabled = cb->secen;
 254         hdr.fc.ack_request = cb->ackreq;
 255         hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
 256
 257         if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
 258                 return -EINVAL;
 259
 260         if (!saddr) {
 261                 spin_lock_bh(&sdata->mib_lock);
 262
 263                 if (sdata->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
 264                     sdata->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
 265                     sdata->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
 266                         hdr.source.mode = IEEE802154_ADDR_LONG;
 267                         hdr.source.extended_addr = sdata->extended_addr;
 268                 } else {
 269                         hdr.source.mode = IEEE802154_ADDR_SHORT;
 270                         hdr.source.short_addr = sdata->short_addr;
 271                 }
 272
 273                 hdr.source.pan_id = sdata->pan_id;
 274
 275                 spin_unlock_bh(&sdata->mib_lock);
 276         } else {
 277                 hdr.source = *(const struct ieee802154_addr *)saddr;
 278         }
 279
 280         hdr.dest = *(const struct ieee802154_addr *)daddr;
 281
 282         hlen = ieee802154_hdr_push(skb, &hdr);
 283         if (hlen < 0)
 284                 return -EINVAL;
 285
 286         skb_reset_mac_header(skb);
 287         skb->mac_len = hlen;
 288
 289         if (len > ieee802154_max_payload(&hdr))
 290                 return -EMSGSIZE;
 291
 292         return hlen;
 293 }
 294
 295 static int
 296 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 297 {
 298         struct ieee802154_hdr hdr;
 299         struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
 300
 301         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
 302                 pr_debug("malformed packet\n");
 303                 return 0;
 304         }
 305
 306         *addr = hdr.source;
 307         return sizeof(*addr);
 308 }
 309
 310 static netdev_tx_t
 311 mac802154_wpan_xmit(struct sk_buff *skb, struct net_device *dev)
 312 {
 313         struct ieee802154_sub_if_data *sdata;
 314         u8 chan, page;
 315         int rc;
 316
 317         sdata = netdev_priv(dev);
 318
 319         spin_lock_bh(&sdata->mib_lock);
 320         chan = sdata->chan;
 321         page = sdata->page;
 322         spin_unlock_bh(&sdata->mib_lock);
 323
 324         if (chan == MAC802154_CHAN_NONE ||
 325             page >= WPAN_NUM_PAGES ||
 326             chan >= WPAN_NUM_CHANNELS) {
 327                 kfree_skb(skb);
 328                 return NETDEV_TX_OK;
 329         }
 330
 331         rc = mac802154_llsec_encrypt(&sdata->sec, skb);
 332         if (rc) {
 333                 pr_warn("encryption failed: %i\n", rc);
 334                 kfree_skb(skb);
 335                 return NETDEV_TX_OK;
 336         }
 337
 338         skb->skb_iif = dev->ifindex;
 339         dev->stats.tx_packets++;
 340         dev->stats.tx_bytes += skb->len;
 341
 342         return mac802154_tx(sdata->local, skb, page, chan);
 343 }
 344
 345 static struct header_ops mac802154_header_ops = {
 346         .create         = mac802154_header_create,
 347         .parse          = mac802154_header_parse,
 348 };
 349
 350 static const struct net_device_ops mac802154_wpan_ops = {
 351         .ndo_open               = mac802154_wpan_open,
 352         .ndo_stop               = mac802154_slave_close,
 353         .ndo_start_xmit         = mac802154_wpan_xmit,
 354         .ndo_do_ioctl           = mac802154_wpan_ioctl,
 355         .ndo_set_mac_address    = mac802154_wpan_mac_addr,
 356 };
 357
 358 static void mac802154_wpan_free(struct net_device *dev)
 359 {
 360         struct ieee802154_sub_if_data *sdata = netdev_priv(dev);
 361
 362         mac802154_llsec_destroy(&sdata->sec);
 363
 364         free_netdev(dev);
 365 }
 366
 367 void mac802154_wpan_setup(struct net_device *dev)
 368 {
 369         struct ieee802154_sub_if_data *sdata;
 370
 371         dev->addr_len           = IEEE802154_ADDR_LEN;
 372         memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
 373
 374         dev->hard_header_len    = MAC802154_FRAME_HARD_HEADER_LEN;
 375         dev->header_ops         = &mac802154_header_ops;
 376         dev->needed_tailroom    = 2 + 16; /* FCS + MIC */
 377         dev->mtu                = IEEE802154_MTU;
 378         dev->tx_queue_len       = 300;
 379         dev->type               = ARPHRD_IEEE802154;
 380         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 381         dev->watchdog_timeo     = 0;
 382
 383         dev->destructor         = mac802154_wpan_free;
 384         dev->netdev_ops         = &mac802154_wpan_ops;
 385         dev->ml_priv            = &mac802154_mlme_wpan;
 386
 387         sdata = netdev_priv(dev);
 388         sdata->type = IEEE802154_DEV_WPAN;
 389
 390         sdata->chan = MAC802154_CHAN_NONE;
 391         sdata->page = 0;
 392
 393         spin_lock_init(&sdata->mib_lock);
 394         mutex_init(&sdata->sec_mtx);
 395
 396         get_random_bytes(&sdata->bsn, 1);
 397         get_random_bytes(&sdata->dsn, 1);
 398
 399         /* defaults per 802.15.4-2011 */
 400         sdata->mac_params.min_be = 3;
 401         sdata->mac_params.max_be = 5;
 402         sdata->mac_params.csma_retries = 4;
 403         /* for compatibility, actual default is 3 */
 404         sdata->mac_params.frame_retries = -1;
 405
 406         sdata->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
 407         sdata->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
 408
 409         mac802154_llsec_init(&sdata->sec);
 410 }
 411
 412 static int mac802154_process_data(struct net_device *dev, struct sk_buff *skb)
 413 {
 414         return netif_rx_ni(skb);
 415 }
 416
 417 static int
 418 mac802154_subif_frame(struct ieee802154_sub_if_data *sdata, struct sk_buff *skb,
 419                       const struct ieee802154_hdr *hdr)
 420 {
 421         __le16 span, sshort;
 422         int rc;
 423
 424         pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
 425
 426         spin_lock_bh(&sdata->mib_lock);
 427
 428         span = sdata->pan_id;
 429         sshort = sdata->short_addr;
 430
 431         switch (mac_cb(skb)->dest.mode) {
 432         case IEEE802154_ADDR_NONE:
 433                 if (mac_cb(skb)->dest.mode != IEEE802154_ADDR_NONE)
 434                         /* FIXME: check if we are PAN coordinator */
 435                         skb->pkt_type = PACKET_OTHERHOST;
 436                 else
 437                         /* ACK comes with both addresses empty */
 438                         skb->pkt_type = PACKET_HOST;
 439                 break;
 440         case IEEE802154_ADDR_LONG:
 441                 if (mac_cb(skb)->dest.pan_id != span &&
 442                     mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
 443                         skb->pkt_type = PACKET_OTHERHOST;
 444                 else if (mac_cb(skb)->dest.extended_addr == sdata->extended_addr)
 445                         skb->pkt_type = PACKET_HOST;
 446                 else
 447                         skb->pkt_type = PACKET_OTHERHOST;
 448                 break;
 449         case IEEE802154_ADDR_SHORT:
 450                 if (mac_cb(skb)->dest.pan_id != span &&
 451                     mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
 452                         skb->pkt_type = PACKET_OTHERHOST;
 453                 else if (mac_cb(skb)->dest.short_addr == sshort)
 454                         skb->pkt_type = PACKET_HOST;
 455                 else if (mac_cb(skb)->dest.short_addr ==
 456                           cpu_to_le16(IEEE802154_ADDR_BROADCAST))
 457                         skb->pkt_type = PACKET_BROADCAST;
 458                 else
 459                         skb->pkt_type = PACKET_OTHERHOST;
 460                 break;
 461         default:
 462                 spin_unlock_bh(&sdata->mib_lock);
 463                 pr_debug("invalid dest mode\n");
 464                 kfree_skb(skb);
 465                 return NET_RX_DROP;
 466         }
 467
 468         spin_unlock_bh(&sdata->mib_lock);
 469
 470         skb->dev = sdata->dev;
 471
 472         rc = mac802154_llsec_decrypt(&sdata->sec, skb);
 473         if (rc) {
 474                 pr_debug("decryption failed: %i\n", rc);
 475                 goto fail;
 476         }
 477
 478         sdata->dev->stats.rx_packets++;
 479         sdata->dev->stats.rx_bytes += skb->len;
 480
 481         switch (mac_cb(skb)->type) {
 482         case IEEE802154_FC_TYPE_DATA:
 483                 return mac802154_process_data(sdata->dev, skb);
 484         default:
 485                 pr_warn("ieee802154: bad frame received (type = %d)\n",
 486                         mac_cb(skb)->type);
 487                 goto fail;
 488         }
 489
 490 fail:
 491         kfree_skb(skb);
 492         return NET_RX_DROP;
 493 }
 494
 495 static void mac802154_print_addr(const char *name,
 496                                  const struct ieee802154_addr *addr)
 497 {
 498         if (addr->mode == IEEE802154_ADDR_NONE)
 499                 pr_debug("%s not present\n", name);
 500
 501         pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id));
 502         if (addr->mode == IEEE802154_ADDR_SHORT) {
 503                 pr_debug("%s is short: %04x\n", name,
 504                          le16_to_cpu(addr->short_addr));
 505         } else {
 506                 u64 hw = swab64((__force u64) addr->extended_addr);
 507
 508                 pr_debug("%s is hardware: %8phC\n", name, &hw);
 509         }
 510 }
 511
 512 static int mac802154_parse_frame_start(struct sk_buff *skb,
 513                                        struct ieee802154_hdr *hdr)
 514 {
 515         int hlen;
 516         struct ieee802154_mac_cb *cb = mac_cb_init(skb);
 517
 518         hlen = ieee802154_hdr_pull(skb, hdr);
 519         if (hlen < 0)
 520                 return -EINVAL;
 521
 522         skb->mac_len = hlen;
 523
 524         pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc),
 525                  hdr->seq);
 526
 527         cb->type = hdr->fc.type;
 528         cb->ackreq = hdr->fc.ack_request;
 529         cb->secen = hdr->fc.security_enabled;
 530
 531         mac802154_print_addr("destination", &hdr->dest);
 532         mac802154_print_addr("source", &hdr->source);
 533
 534         cb->source = hdr->source;
 535         cb->dest = hdr->dest;
 536
 537         if (hdr->fc.security_enabled) {
 538                 u64 key;
 539
 540                 pr_debug("seclevel %i\n", hdr->sec.level);
 541
 542                 switch (hdr->sec.key_id_mode) {
 543                 case IEEE802154_SCF_KEY_IMPLICIT:
 544                         pr_debug("implicit key\n");
 545                         break;
 546
 547                 case IEEE802154_SCF_KEY_INDEX:
 548                         pr_debug("key %02x\n", hdr->sec.key_id);
 549                         break;
 550
 551                 case IEEE802154_SCF_KEY_SHORT_INDEX:
 552                         pr_debug("key %04x:%04x %02x\n",
 553                                  le32_to_cpu(hdr->sec.short_src) >> 16,
 554                                  le32_to_cpu(hdr->sec.short_src) & 0xffff,
 555                                  hdr->sec.key_id);
 556                         break;
 557
 558                 case IEEE802154_SCF_KEY_HW_INDEX:
 559                         key = swab64((__force u64) hdr->sec.extended_src);
 560                         pr_debug("key source %8phC %02x\n", &key,
 561                                  hdr->sec.key_id);
 562                         break;
 563                 }
 564         }
 565
 566         return 0;
 567 }
 568
 569 void mac802154_wpans_rx(struct ieee802154_local *local, struct sk_buff *skb)
 570 {
 571         int ret;
 572         struct ieee802154_sub_if_data *sdata;
 573         struct ieee802154_hdr hdr;
 574
 575         ret = mac802154_parse_frame_start(skb, &hdr);
 576         if (ret) {
 577                 pr_debug("got invalid frame\n");
 578                 kfree_skb(skb);
 579                 return;
 580         }
 581
 582         rcu_read_lock();
 583         list_for_each_entry_rcu(sdata, &local->slaves, list) {
 584                 if (sdata->type != IEEE802154_DEV_WPAN ||
 585                     !netif_running(sdata->dev))
 586                         continue;
 587
 588                 mac802154_subif_frame(sdata, skb, &hdr);
 589                 skb = NULL;
 590                 break;
 591         }
 592         rcu_read_unlock();
 593
 594         if (skb)
 595                 kfree_skb(skb);
 596 }