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, ¶ms, 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_wpan_open(struct net_device *dev) 146 { 147 int rc; 148 struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(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, ¶ms); 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 = IEEE802154_DEV_TO_SUB_IF(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 struct header_ops mac802154_header_ops = { 311 .create = mac802154_header_create, 312 .parse = mac802154_header_parse, 313 }; 314 315 static const struct net_device_ops mac802154_wpan_ops = { 316 .ndo_open = mac802154_wpan_open, 317 .ndo_stop = mac802154_slave_close, 318 .ndo_start_xmit = ieee802154_subif_start_xmit, 319 .ndo_do_ioctl = mac802154_wpan_ioctl, 320 .ndo_set_mac_address = mac802154_wpan_mac_addr, 321 }; 322 323 static void mac802154_wpan_free(struct net_device *dev) 324 { 325 struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev); 326 327 mac802154_llsec_destroy(&sdata->sec); 328 329 free_netdev(dev); 330 } 331 332 void mac802154_wpan_setup(struct net_device *dev) 333 { 334 struct ieee802154_sub_if_data *sdata; 335 336 dev->addr_len = IEEE802154_ADDR_LEN; 337 memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN); 338 339 dev->hard_header_len = MAC802154_FRAME_HARD_HEADER_LEN; 340 dev->header_ops = &mac802154_header_ops; 341 dev->needed_tailroom = 2 + 16; /* FCS + MIC */ 342 dev->mtu = IEEE802154_MTU; 343 dev->tx_queue_len = 300; 344 dev->type = ARPHRD_IEEE802154; 345 dev->flags = IFF_NOARP | IFF_BROADCAST; 346 dev->watchdog_timeo = 0; 347 348 dev->destructor = mac802154_wpan_free; 349 dev->netdev_ops = &mac802154_wpan_ops; 350 dev->ml_priv = &mac802154_mlme_wpan; 351 352 sdata = IEEE802154_DEV_TO_SUB_IF(dev); 353 sdata->type = IEEE802154_DEV_WPAN; 354 355 sdata->chan = MAC802154_CHAN_NONE; 356 sdata->page = 0; 357 358 spin_lock_init(&sdata->mib_lock); 359 mutex_init(&sdata->sec_mtx); 360 361 get_random_bytes(&sdata->bsn, 1); 362 get_random_bytes(&sdata->dsn, 1); 363 364 /* defaults per 802.15.4-2011 */ 365 sdata->mac_params.min_be = 3; 366 sdata->mac_params.max_be = 5; 367 sdata->mac_params.csma_retries = 4; 368 /* for compatibility, actual default is 3 */ 369 sdata->mac_params.frame_retries = -1; 370 371 sdata->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST); 372 sdata->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST); 373 374 mac802154_llsec_init(&sdata->sec); 375 } 376 377 static int mac802154_process_data(struct net_device *dev, struct sk_buff *skb) 378 { 379 return netif_receive_skb(skb); 380 } 381 382 static int 383 mac802154_subif_frame(struct ieee802154_sub_if_data *sdata, struct sk_buff *skb, 384 const struct ieee802154_hdr *hdr) 385 { 386 __le16 span, sshort; 387 int rc; 388 389 pr_debug("getting packet via slave interface %s\n", sdata->dev->name); 390 391 spin_lock_bh(&sdata->mib_lock); 392 393 span = sdata->pan_id; 394 sshort = sdata->short_addr; 395 396 switch (mac_cb(skb)->dest.mode) { 397 case IEEE802154_ADDR_NONE: 398 if (mac_cb(skb)->dest.mode != IEEE802154_ADDR_NONE) 399 /* FIXME: check if we are PAN coordinator */ 400 skb->pkt_type = PACKET_OTHERHOST; 401 else 402 /* ACK comes with both addresses empty */ 403 skb->pkt_type = PACKET_HOST; 404 break; 405 case IEEE802154_ADDR_LONG: 406 if (mac_cb(skb)->dest.pan_id != span && 407 mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST)) 408 skb->pkt_type = PACKET_OTHERHOST; 409 else if (mac_cb(skb)->dest.extended_addr == sdata->extended_addr) 410 skb->pkt_type = PACKET_HOST; 411 else 412 skb->pkt_type = PACKET_OTHERHOST; 413 break; 414 case IEEE802154_ADDR_SHORT: 415 if (mac_cb(skb)->dest.pan_id != span && 416 mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST)) 417 skb->pkt_type = PACKET_OTHERHOST; 418 else if (mac_cb(skb)->dest.short_addr == sshort) 419 skb->pkt_type = PACKET_HOST; 420 else if (mac_cb(skb)->dest.short_addr == 421 cpu_to_le16(IEEE802154_ADDR_BROADCAST)) 422 skb->pkt_type = PACKET_BROADCAST; 423 else 424 skb->pkt_type = PACKET_OTHERHOST; 425 break; 426 default: 427 spin_unlock_bh(&sdata->mib_lock); 428 pr_debug("invalid dest mode\n"); 429 kfree_skb(skb); 430 return NET_RX_DROP; 431 } 432 433 spin_unlock_bh(&sdata->mib_lock); 434 435 skb->dev = sdata->dev; 436 437 rc = mac802154_llsec_decrypt(&sdata->sec, skb); 438 if (rc) { 439 pr_debug("decryption failed: %i\n", rc); 440 goto fail; 441 } 442 443 sdata->dev->stats.rx_packets++; 444 sdata->dev->stats.rx_bytes += skb->len; 445 446 switch (mac_cb(skb)->type) { 447 case IEEE802154_FC_TYPE_DATA: 448 return mac802154_process_data(sdata->dev, skb); 449 default: 450 pr_warn("ieee802154: bad frame received (type = %d)\n", 451 mac_cb(skb)->type); 452 goto fail; 453 } 454 455 fail: 456 kfree_skb(skb); 457 return NET_RX_DROP; 458 } 459 460 static void mac802154_print_addr(const char *name, 461 const struct ieee802154_addr *addr) 462 { 463 if (addr->mode == IEEE802154_ADDR_NONE) 464 pr_debug("%s not present\n", name); 465 466 pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id)); 467 if (addr->mode == IEEE802154_ADDR_SHORT) { 468 pr_debug("%s is short: %04x\n", name, 469 le16_to_cpu(addr->short_addr)); 470 } else { 471 u64 hw = swab64((__force u64) addr->extended_addr); 472 473 pr_debug("%s is hardware: %8phC\n", name, &hw); 474 } 475 } 476 477 static int mac802154_parse_frame_start(struct sk_buff *skb, 478 struct ieee802154_hdr *hdr) 479 { 480 int hlen; 481 struct ieee802154_mac_cb *cb = mac_cb_init(skb); 482 483 hlen = ieee802154_hdr_pull(skb, hdr); 484 if (hlen < 0) 485 return -EINVAL; 486 487 skb->mac_len = hlen; 488 489 pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc), 490 hdr->seq); 491 492 cb->type = hdr->fc.type; 493 cb->ackreq = hdr->fc.ack_request; 494 cb->secen = hdr->fc.security_enabled; 495 496 mac802154_print_addr("destination", &hdr->dest); 497 mac802154_print_addr("source", &hdr->source); 498 499 cb->source = hdr->source; 500 cb->dest = hdr->dest; 501 502 if (hdr->fc.security_enabled) { 503 u64 key; 504 505 pr_debug("seclevel %i\n", hdr->sec.level); 506 507 switch (hdr->sec.key_id_mode) { 508 case IEEE802154_SCF_KEY_IMPLICIT: 509 pr_debug("implicit key\n"); 510 break; 511 512 case IEEE802154_SCF_KEY_INDEX: 513 pr_debug("key %02x\n", hdr->sec.key_id); 514 break; 515 516 case IEEE802154_SCF_KEY_SHORT_INDEX: 517 pr_debug("key %04x:%04x %02x\n", 518 le32_to_cpu(hdr->sec.short_src) >> 16, 519 le32_to_cpu(hdr->sec.short_src) & 0xffff, 520 hdr->sec.key_id); 521 break; 522 523 case IEEE802154_SCF_KEY_HW_INDEX: 524 key = swab64((__force u64) hdr->sec.extended_src); 525 pr_debug("key source %8phC %02x\n", &key, 526 hdr->sec.key_id); 527 break; 528 } 529 } 530 531 return 0; 532 } 533 534 void mac802154_wpans_rx(struct ieee802154_local *local, struct sk_buff *skb) 535 { 536 int ret; 537 struct ieee802154_sub_if_data *sdata; 538 struct ieee802154_hdr hdr; 539 540 ret = mac802154_parse_frame_start(skb, &hdr); 541 if (ret) { 542 pr_debug("got invalid frame\n"); 543 kfree_skb(skb); 544 return; 545 } 546 547 rcu_read_lock(); 548 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 549 if (sdata->type != IEEE802154_DEV_WPAN || 550 !netif_running(sdata->dev)) 551 continue; 552 553 mac802154_subif_frame(sdata, skb, &hdr); 554 skb = NULL; 555 break; 556 } 557 rcu_read_unlock(); 558 559 if (skb) 560 kfree_skb(skb); 561 } 562