1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #include <net/mac80211.h> 12 #include <net/ieee80211_radiotap.h> 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/netdevice.h> 16 #include <linux/types.h> 17 #include <linux/slab.h> 18 #include <linux/skbuff.h> 19 #include <linux/etherdevice.h> 20 #include <linux/if_arp.h> 21 #include <linux/wireless.h> 22 #include <linux/rtnetlink.h> 23 #include <linux/bitmap.h> 24 #include <net/net_namespace.h> 25 #include <net/cfg80211.h> 26 27 #include "ieee80211_i.h" 28 #include "rate.h" 29 #include "mesh.h" 30 #include "wep.h" 31 #include "wme.h" 32 #include "aes_ccm.h" 33 #include "led.h" 34 #include "cfg.h" 35 #include "debugfs.h" 36 #include "debugfs_netdev.h" 37 38 /* 39 * For seeing transmitted packets on monitor interfaces 40 * we have a radiotap header too. 41 */ 42 struct ieee80211_tx_status_rtap_hdr { 43 struct ieee80211_radiotap_header hdr; 44 u8 rate; 45 u8 padding_for_rate; 46 __le16 tx_flags; 47 u8 data_retries; 48 } __attribute__ ((packed)); 49 50 51 /* must be called under mdev tx lock */ 52 void ieee80211_configure_filter(struct ieee80211_local *local) 53 { 54 unsigned int changed_flags; 55 unsigned int new_flags = 0; 56 57 if (atomic_read(&local->iff_promiscs)) 58 new_flags |= FIF_PROMISC_IN_BSS; 59 60 if (atomic_read(&local->iff_allmultis)) 61 new_flags |= FIF_ALLMULTI; 62 63 if (local->monitors) 64 new_flags |= FIF_BCN_PRBRESP_PROMISC; 65 66 if (local->fif_fcsfail) 67 new_flags |= FIF_FCSFAIL; 68 69 if (local->fif_plcpfail) 70 new_flags |= FIF_PLCPFAIL; 71 72 if (local->fif_control) 73 new_flags |= FIF_CONTROL; 74 75 if (local->fif_other_bss) 76 new_flags |= FIF_OTHER_BSS; 77 78 changed_flags = local->filter_flags ^ new_flags; 79 80 /* be a bit nasty */ 81 new_flags |= (1<<31); 82 83 local->ops->configure_filter(local_to_hw(local), 84 changed_flags, &new_flags, 85 local->mdev->mc_count, 86 local->mdev->mc_list); 87 88 WARN_ON(new_flags & (1<<31)); 89 90 local->filter_flags = new_flags & ~(1<<31); 91 } 92 93 /* master interface */ 94 95 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr) 96 { 97 memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */ 98 return ETH_ALEN; 99 } 100 101 static const struct header_ops ieee80211_header_ops = { 102 .create = eth_header, 103 .parse = header_parse_80211, 104 .rebuild = eth_rebuild_header, 105 .cache = eth_header_cache, 106 .cache_update = eth_header_cache_update, 107 }; 108 109 static int ieee80211_master_open(struct net_device *dev) 110 { 111 struct ieee80211_master_priv *mpriv = netdev_priv(dev); 112 struct ieee80211_local *local = mpriv->local; 113 struct ieee80211_sub_if_data *sdata; 114 int res = -EOPNOTSUPP; 115 116 /* we hold the RTNL here so can safely walk the list */ 117 list_for_each_entry(sdata, &local->interfaces, list) { 118 if (netif_running(sdata->dev)) { 119 res = 0; 120 break; 121 } 122 } 123 124 if (res) 125 return res; 126 127 netif_tx_start_all_queues(local->mdev); 128 129 return 0; 130 } 131 132 static int ieee80211_master_stop(struct net_device *dev) 133 { 134 struct ieee80211_master_priv *mpriv = netdev_priv(dev); 135 struct ieee80211_local *local = mpriv->local; 136 struct ieee80211_sub_if_data *sdata; 137 138 /* we hold the RTNL here so can safely walk the list */ 139 list_for_each_entry(sdata, &local->interfaces, list) 140 if (netif_running(sdata->dev)) 141 dev_close(sdata->dev); 142 143 return 0; 144 } 145 146 static void ieee80211_master_set_multicast_list(struct net_device *dev) 147 { 148 struct ieee80211_master_priv *mpriv = netdev_priv(dev); 149 struct ieee80211_local *local = mpriv->local; 150 151 ieee80211_configure_filter(local); 152 } 153 154 /* everything else */ 155 156 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed) 157 { 158 struct ieee80211_local *local = sdata->local; 159 struct ieee80211_if_conf conf; 160 161 if (WARN_ON(!netif_running(sdata->dev))) 162 return 0; 163 164 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 165 return -EINVAL; 166 167 if (!local->ops->config_interface) 168 return 0; 169 170 memset(&conf, 0, sizeof(conf)); 171 conf.changed = changed; 172 173 if (sdata->vif.type == NL80211_IFTYPE_STATION || 174 sdata->vif.type == NL80211_IFTYPE_ADHOC) 175 conf.bssid = sdata->u.sta.bssid; 176 else if (sdata->vif.type == NL80211_IFTYPE_AP) 177 conf.bssid = sdata->dev->dev_addr; 178 else if (ieee80211_vif_is_mesh(&sdata->vif)) { 179 u8 zero[ETH_ALEN] = { 0 }; 180 conf.bssid = zero; 181 } else { 182 WARN_ON(1); 183 return -EINVAL; 184 } 185 186 if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID))) 187 return -EINVAL; 188 189 return local->ops->config_interface(local_to_hw(local), 190 &sdata->vif, &conf); 191 } 192 193 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 194 { 195 struct ieee80211_channel *chan; 196 int ret = 0; 197 int power; 198 enum nl80211_channel_type channel_type; 199 200 might_sleep(); 201 202 if (local->sw_scanning) { 203 chan = local->scan_channel; 204 channel_type = NL80211_CHAN_NO_HT; 205 } else { 206 chan = local->oper_channel; 207 channel_type = local->oper_channel_type; 208 } 209 210 if (chan != local->hw.conf.channel || 211 channel_type != local->hw.conf.ht.channel_type) { 212 local->hw.conf.channel = chan; 213 local->hw.conf.ht.channel_type = channel_type; 214 switch (channel_type) { 215 case NL80211_CHAN_NO_HT: 216 local->hw.conf.ht.enabled = false; 217 break; 218 case NL80211_CHAN_HT20: 219 case NL80211_CHAN_HT40MINUS: 220 case NL80211_CHAN_HT40PLUS: 221 local->hw.conf.ht.enabled = true; 222 break; 223 } 224 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 225 } 226 227 if (!local->hw.conf.power_level) 228 power = chan->max_power; 229 else 230 power = min(chan->max_power, local->hw.conf.power_level); 231 if (local->hw.conf.power_level != power) { 232 changed |= IEEE80211_CONF_CHANGE_POWER; 233 local->hw.conf.power_level = power; 234 } 235 236 if (changed && local->open_count) { 237 ret = local->ops->config(local_to_hw(local), changed); 238 /* 239 * Goal: 240 * HW reconfiguration should never fail, the driver has told 241 * us what it can support so it should live up to that promise. 242 * 243 * Current status: 244 * rfkill is not integrated with mac80211 and a 245 * configuration command can thus fail if hardware rfkill 246 * is enabled 247 * 248 * FIXME: integrate rfkill with mac80211 and then add this 249 * WARN_ON() back 250 * 251 */ 252 /* WARN_ON(ret); */ 253 } 254 255 return ret; 256 } 257 258 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 259 u32 changed) 260 { 261 struct ieee80211_local *local = sdata->local; 262 263 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 264 return; 265 266 if (!changed) 267 return; 268 269 if (local->ops->bss_info_changed) 270 local->ops->bss_info_changed(local_to_hw(local), 271 &sdata->vif, 272 &sdata->vif.bss_conf, 273 changed); 274 } 275 276 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 277 { 278 sdata->vif.bss_conf.use_cts_prot = false; 279 sdata->vif.bss_conf.use_short_preamble = false; 280 sdata->vif.bss_conf.use_short_slot = false; 281 return BSS_CHANGED_ERP_CTS_PROT | 282 BSS_CHANGED_ERP_PREAMBLE | 283 BSS_CHANGED_ERP_SLOT; 284 } 285 286 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, 287 struct sk_buff *skb) 288 { 289 struct ieee80211_local *local = hw_to_local(hw); 290 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 291 int tmp; 292 293 skb->dev = local->mdev; 294 skb->pkt_type = IEEE80211_TX_STATUS_MSG; 295 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ? 296 &local->skb_queue : &local->skb_queue_unreliable, skb); 297 tmp = skb_queue_len(&local->skb_queue) + 298 skb_queue_len(&local->skb_queue_unreliable); 299 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && 300 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 301 dev_kfree_skb_irq(skb); 302 tmp--; 303 I802_DEBUG_INC(local->tx_status_drop); 304 } 305 tasklet_schedule(&local->tasklet); 306 } 307 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); 308 309 static void ieee80211_tasklet_handler(unsigned long data) 310 { 311 struct ieee80211_local *local = (struct ieee80211_local *) data; 312 struct sk_buff *skb; 313 struct ieee80211_rx_status rx_status; 314 struct ieee80211_ra_tid *ra_tid; 315 316 while ((skb = skb_dequeue(&local->skb_queue)) || 317 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 318 switch (skb->pkt_type) { 319 case IEEE80211_RX_MSG: 320 /* status is in skb->cb */ 321 memcpy(&rx_status, skb->cb, sizeof(rx_status)); 322 /* Clear skb->pkt_type in order to not confuse kernel 323 * netstack. */ 324 skb->pkt_type = 0; 325 __ieee80211_rx(local_to_hw(local), skb, &rx_status); 326 break; 327 case IEEE80211_TX_STATUS_MSG: 328 skb->pkt_type = 0; 329 ieee80211_tx_status(local_to_hw(local), skb); 330 break; 331 case IEEE80211_DELBA_MSG: 332 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 333 ieee80211_stop_tx_ba_cb(local_to_hw(local), 334 ra_tid->ra, ra_tid->tid); 335 dev_kfree_skb(skb); 336 break; 337 case IEEE80211_ADDBA_MSG: 338 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 339 ieee80211_start_tx_ba_cb(local_to_hw(local), 340 ra_tid->ra, ra_tid->tid); 341 dev_kfree_skb(skb); 342 break ; 343 default: 344 WARN(1, "mac80211: Packet is of unknown type %d\n", 345 skb->pkt_type); 346 dev_kfree_skb(skb); 347 break; 348 } 349 } 350 } 351 352 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to 353 * make a prepared TX frame (one that has been given to hw) to look like brand 354 * new IEEE 802.11 frame that is ready to go through TX processing again. 355 */ 356 static void ieee80211_remove_tx_extra(struct ieee80211_local *local, 357 struct ieee80211_key *key, 358 struct sk_buff *skb) 359 { 360 unsigned int hdrlen, iv_len, mic_len; 361 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 362 363 hdrlen = ieee80211_hdrlen(hdr->frame_control); 364 365 if (!key) 366 goto no_key; 367 368 switch (key->conf.alg) { 369 case ALG_WEP: 370 iv_len = WEP_IV_LEN; 371 mic_len = WEP_ICV_LEN; 372 break; 373 case ALG_TKIP: 374 iv_len = TKIP_IV_LEN; 375 mic_len = TKIP_ICV_LEN; 376 break; 377 case ALG_CCMP: 378 iv_len = CCMP_HDR_LEN; 379 mic_len = CCMP_MIC_LEN; 380 break; 381 default: 382 goto no_key; 383 } 384 385 if (skb->len >= hdrlen + mic_len && 386 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 387 skb_trim(skb, skb->len - mic_len); 388 if (skb->len >= hdrlen + iv_len) { 389 memmove(skb->data + iv_len, skb->data, hdrlen); 390 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len); 391 } 392 393 no_key: 394 if (ieee80211_is_data_qos(hdr->frame_control)) { 395 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 396 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data, 397 hdrlen - IEEE80211_QOS_CTL_LEN); 398 skb_pull(skb, IEEE80211_QOS_CTL_LEN); 399 } 400 } 401 402 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, 403 struct sta_info *sta, 404 struct sk_buff *skb) 405 { 406 sta->tx_filtered_count++; 407 408 /* 409 * Clear the TX filter mask for this STA when sending the next 410 * packet. If the STA went to power save mode, this will happen 411 * when it wakes up for the next time. 412 */ 413 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT); 414 415 /* 416 * This code races in the following way: 417 * 418 * (1) STA sends frame indicating it will go to sleep and does so 419 * (2) hardware/firmware adds STA to filter list, passes frame up 420 * (3) hardware/firmware processes TX fifo and suppresses a frame 421 * (4) we get TX status before having processed the frame and 422 * knowing that the STA has gone to sleep. 423 * 424 * This is actually quite unlikely even when both those events are 425 * processed from interrupts coming in quickly after one another or 426 * even at the same time because we queue both TX status events and 427 * RX frames to be processed by a tasklet and process them in the 428 * same order that they were received or TX status last. Hence, there 429 * is no race as long as the frame RX is processed before the next TX 430 * status, which drivers can ensure, see below. 431 * 432 * Note that this can only happen if the hardware or firmware can 433 * actually add STAs to the filter list, if this is done by the 434 * driver in response to set_tim() (which will only reduce the race 435 * this whole filtering tries to solve, not completely solve it) 436 * this situation cannot happen. 437 * 438 * To completely solve this race drivers need to make sure that they 439 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 440 * functions and 441 * (b) always process RX events before TX status events if ordering 442 * can be unknown, for example with different interrupt status 443 * bits. 444 */ 445 if (test_sta_flags(sta, WLAN_STA_PS) && 446 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) { 447 ieee80211_remove_tx_extra(local, sta->key, skb); 448 skb_queue_tail(&sta->tx_filtered, skb); 449 return; 450 } 451 452 if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) { 453 /* Software retry the packet once */ 454 skb->requeue = 1; 455 ieee80211_remove_tx_extra(local, sta->key, skb); 456 dev_queue_xmit(skb); 457 return; 458 } 459 460 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 461 if (net_ratelimit()) 462 printk(KERN_DEBUG "%s: dropped TX filtered frame, " 463 "queue_len=%d PS=%d @%lu\n", 464 wiphy_name(local->hw.wiphy), 465 skb_queue_len(&sta->tx_filtered), 466 !!test_sta_flags(sta, WLAN_STA_PS), jiffies); 467 #endif 468 dev_kfree_skb(skb); 469 } 470 471 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 472 { 473 struct sk_buff *skb2; 474 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 475 struct ieee80211_local *local = hw_to_local(hw); 476 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 477 u16 frag, type; 478 __le16 fc; 479 struct ieee80211_supported_band *sband; 480 struct ieee80211_tx_status_rtap_hdr *rthdr; 481 struct ieee80211_sub_if_data *sdata; 482 struct net_device *prev_dev = NULL; 483 struct sta_info *sta; 484 int retry_count = -1, i; 485 486 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 487 /* the HW cannot have attempted that rate */ 488 if (i >= hw->max_rates) { 489 info->status.rates[i].idx = -1; 490 info->status.rates[i].count = 0; 491 } 492 493 retry_count += info->status.rates[i].count; 494 } 495 if (retry_count < 0) 496 retry_count = 0; 497 498 rcu_read_lock(); 499 500 sband = local->hw.wiphy->bands[info->band]; 501 502 sta = sta_info_get(local, hdr->addr1); 503 504 if (sta) { 505 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 506 test_sta_flags(sta, WLAN_STA_PS)) { 507 /* 508 * The STA is in power save mode, so assume 509 * that this TX packet failed because of that. 510 */ 511 ieee80211_handle_filtered_frame(local, sta, skb); 512 rcu_read_unlock(); 513 return; 514 } 515 516 fc = hdr->frame_control; 517 518 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 519 (ieee80211_is_data_qos(fc))) { 520 u16 tid, ssn; 521 u8 *qc; 522 523 qc = ieee80211_get_qos_ctl(hdr); 524 tid = qc[0] & 0xf; 525 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 526 & IEEE80211_SCTL_SEQ); 527 ieee80211_send_bar(sta->sdata, hdr->addr1, 528 tid, ssn); 529 } 530 531 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 532 ieee80211_handle_filtered_frame(local, sta, skb); 533 rcu_read_unlock(); 534 return; 535 } else { 536 if (!(info->flags & IEEE80211_TX_STAT_ACK)) 537 sta->tx_retry_failed++; 538 sta->tx_retry_count += retry_count; 539 } 540 541 rate_control_tx_status(local, sband, sta, skb); 542 } 543 544 rcu_read_unlock(); 545 546 ieee80211_led_tx(local, 0); 547 548 /* SNMP counters 549 * Fragments are passed to low-level drivers as separate skbs, so these 550 * are actually fragments, not frames. Update frame counters only for 551 * the first fragment of the frame. */ 552 553 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG; 554 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE; 555 556 if (info->flags & IEEE80211_TX_STAT_ACK) { 557 if (frag == 0) { 558 local->dot11TransmittedFrameCount++; 559 if (is_multicast_ether_addr(hdr->addr1)) 560 local->dot11MulticastTransmittedFrameCount++; 561 if (retry_count > 0) 562 local->dot11RetryCount++; 563 if (retry_count > 1) 564 local->dot11MultipleRetryCount++; 565 } 566 567 /* This counter shall be incremented for an acknowledged MPDU 568 * with an individual address in the address 1 field or an MPDU 569 * with a multicast address in the address 1 field of type Data 570 * or Management. */ 571 if (!is_multicast_ether_addr(hdr->addr1) || 572 type == IEEE80211_FTYPE_DATA || 573 type == IEEE80211_FTYPE_MGMT) 574 local->dot11TransmittedFragmentCount++; 575 } else { 576 if (frag == 0) 577 local->dot11FailedCount++; 578 } 579 580 /* this was a transmitted frame, but now we want to reuse it */ 581 skb_orphan(skb); 582 583 /* 584 * This is a bit racy but we can avoid a lot of work 585 * with this test... 586 */ 587 if (!local->monitors && !local->cooked_mntrs) { 588 dev_kfree_skb(skb); 589 return; 590 } 591 592 /* send frame to monitor interfaces now */ 593 594 if (skb_headroom(skb) < sizeof(*rthdr)) { 595 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n"); 596 dev_kfree_skb(skb); 597 return; 598 } 599 600 rthdr = (struct ieee80211_tx_status_rtap_hdr *) 601 skb_push(skb, sizeof(*rthdr)); 602 603 memset(rthdr, 0, sizeof(*rthdr)); 604 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); 605 rthdr->hdr.it_present = 606 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 607 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) | 608 (1 << IEEE80211_RADIOTAP_RATE)); 609 610 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 611 !is_multicast_ether_addr(hdr->addr1)) 612 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL); 613 614 /* 615 * XXX: Once radiotap gets the bitmap reset thing the vendor 616 * extensions proposal contains, we can actually report 617 * the whole set of tries we did. 618 */ 619 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || 620 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) 621 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS); 622 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 623 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS); 624 if (info->status.rates[0].idx >= 0 && 625 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) 626 rthdr->rate = sband->bitrates[ 627 info->status.rates[0].idx].bitrate / 5; 628 629 /* for now report the total retry_count */ 630 rthdr->data_retries = retry_count; 631 632 /* XXX: is this sufficient for BPF? */ 633 skb_set_mac_header(skb, 0); 634 skb->ip_summed = CHECKSUM_UNNECESSARY; 635 skb->pkt_type = PACKET_OTHERHOST; 636 skb->protocol = htons(ETH_P_802_2); 637 memset(skb->cb, 0, sizeof(skb->cb)); 638 639 rcu_read_lock(); 640 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 641 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 642 if (!netif_running(sdata->dev)) 643 continue; 644 645 if (prev_dev) { 646 skb2 = skb_clone(skb, GFP_ATOMIC); 647 if (skb2) { 648 skb2->dev = prev_dev; 649 netif_rx(skb2); 650 } 651 } 652 653 prev_dev = sdata->dev; 654 } 655 } 656 if (prev_dev) { 657 skb->dev = prev_dev; 658 netif_rx(skb); 659 skb = NULL; 660 } 661 rcu_read_unlock(); 662 dev_kfree_skb(skb); 663 } 664 EXPORT_SYMBOL(ieee80211_tx_status); 665 666 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 667 const struct ieee80211_ops *ops) 668 { 669 struct ieee80211_local *local; 670 int priv_size; 671 struct wiphy *wiphy; 672 673 /* Ensure 32-byte alignment of our private data and hw private data. 674 * We use the wiphy priv data for both our ieee80211_local and for 675 * the driver's private data 676 * 677 * In memory it'll be like this: 678 * 679 * +-------------------------+ 680 * | struct wiphy | 681 * +-------------------------+ 682 * | struct ieee80211_local | 683 * +-------------------------+ 684 * | driver's private data | 685 * +-------------------------+ 686 * 687 */ 688 priv_size = ((sizeof(struct ieee80211_local) + 689 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) + 690 priv_data_len; 691 692 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 693 694 if (!wiphy) 695 return NULL; 696 697 wiphy->privid = mac80211_wiphy_privid; 698 699 local = wiphy_priv(wiphy); 700 local->hw.wiphy = wiphy; 701 702 local->hw.priv = (char *)local + 703 ((sizeof(struct ieee80211_local) + 704 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST); 705 706 BUG_ON(!ops->tx); 707 BUG_ON(!ops->start); 708 BUG_ON(!ops->stop); 709 BUG_ON(!ops->config); 710 BUG_ON(!ops->add_interface); 711 BUG_ON(!ops->remove_interface); 712 BUG_ON(!ops->configure_filter); 713 local->ops = ops; 714 715 /* set up some defaults */ 716 local->hw.queues = 1; 717 local->hw.max_rates = 1; 718 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD; 719 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD; 720 local->hw.conf.long_frame_max_tx_count = 4; 721 local->hw.conf.short_frame_max_tx_count = 7; 722 local->hw.conf.radio_enabled = true; 723 724 INIT_LIST_HEAD(&local->interfaces); 725 726 spin_lock_init(&local->key_lock); 727 728 spin_lock_init(&local->queue_stop_reason_lock); 729 730 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 731 732 INIT_WORK(&local->dynamic_ps_enable_work, 733 ieee80211_dynamic_ps_enable_work); 734 INIT_WORK(&local->dynamic_ps_disable_work, 735 ieee80211_dynamic_ps_disable_work); 736 setup_timer(&local->dynamic_ps_timer, 737 ieee80211_dynamic_ps_timer, (unsigned long) local); 738 739 sta_info_init(local); 740 741 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 742 (unsigned long)local); 743 tasklet_disable(&local->tx_pending_tasklet); 744 745 tasklet_init(&local->tasklet, 746 ieee80211_tasklet_handler, 747 (unsigned long) local); 748 tasklet_disable(&local->tasklet); 749 750 skb_queue_head_init(&local->skb_queue); 751 skb_queue_head_init(&local->skb_queue_unreliable); 752 753 return local_to_hw(local); 754 } 755 EXPORT_SYMBOL(ieee80211_alloc_hw); 756 757 int ieee80211_register_hw(struct ieee80211_hw *hw) 758 { 759 struct ieee80211_local *local = hw_to_local(hw); 760 int result; 761 enum ieee80211_band band; 762 struct net_device *mdev; 763 struct ieee80211_master_priv *mpriv; 764 765 /* 766 * generic code guarantees at least one band, 767 * set this very early because much code assumes 768 * that hw.conf.channel is assigned 769 */ 770 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 771 struct ieee80211_supported_band *sband; 772 773 sband = local->hw.wiphy->bands[band]; 774 if (sband) { 775 /* init channel we're on */ 776 local->hw.conf.channel = 777 local->oper_channel = 778 local->scan_channel = &sband->channels[0]; 779 break; 780 } 781 } 782 783 /* if low-level driver supports AP, we also support VLAN */ 784 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) 785 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 786 787 /* mac80211 always supports monitor */ 788 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 789 790 result = wiphy_register(local->hw.wiphy); 791 if (result < 0) 792 return result; 793 794 /* 795 * We use the number of queues for feature tests (QoS, HT) internally 796 * so restrict them appropriately. 797 */ 798 if (hw->queues > IEEE80211_MAX_QUEUES) 799 hw->queues = IEEE80211_MAX_QUEUES; 800 if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES) 801 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES; 802 if (hw->queues < 4) 803 hw->ampdu_queues = 0; 804 805 mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv), 806 "wmaster%d", ether_setup, 807 ieee80211_num_queues(hw)); 808 if (!mdev) 809 goto fail_mdev_alloc; 810 811 mpriv = netdev_priv(mdev); 812 mpriv->local = local; 813 local->mdev = mdev; 814 815 ieee80211_rx_bss_list_init(local); 816 817 mdev->hard_start_xmit = ieee80211_master_start_xmit; 818 mdev->open = ieee80211_master_open; 819 mdev->stop = ieee80211_master_stop; 820 mdev->type = ARPHRD_IEEE80211; 821 mdev->header_ops = &ieee80211_header_ops; 822 mdev->set_multicast_list = ieee80211_master_set_multicast_list; 823 824 local->hw.workqueue = 825 create_freezeable_workqueue(wiphy_name(local->hw.wiphy)); 826 if (!local->hw.workqueue) { 827 result = -ENOMEM; 828 goto fail_workqueue; 829 } 830 831 /* 832 * The hardware needs headroom for sending the frame, 833 * and we need some headroom for passing the frame to monitor 834 * interfaces, but never both at the same time. 835 */ 836 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 837 sizeof(struct ieee80211_tx_status_rtap_hdr)); 838 839 debugfs_hw_add(local); 840 841 if (local->hw.conf.beacon_int < 10) 842 local->hw.conf.beacon_int = 100; 843 844 if (local->hw.max_listen_interval == 0) 845 local->hw.max_listen_interval = 1; 846 847 local->hw.conf.listen_interval = local->hw.max_listen_interval; 848 849 local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC | 850 IEEE80211_HW_SIGNAL_DB | 851 IEEE80211_HW_SIGNAL_DBM) ? 852 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID; 853 local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ? 854 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID; 855 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 856 local->wstats_flags |= IW_QUAL_DBM; 857 858 result = sta_info_start(local); 859 if (result < 0) 860 goto fail_sta_info; 861 862 rtnl_lock(); 863 result = dev_alloc_name(local->mdev, local->mdev->name); 864 if (result < 0) 865 goto fail_dev; 866 867 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 868 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy)); 869 870 result = register_netdevice(local->mdev); 871 if (result < 0) 872 goto fail_dev; 873 874 result = ieee80211_init_rate_ctrl_alg(local, 875 hw->rate_control_algorithm); 876 if (result < 0) { 877 printk(KERN_DEBUG "%s: Failed to initialize rate control " 878 "algorithm\n", wiphy_name(local->hw.wiphy)); 879 goto fail_rate; 880 } 881 882 result = ieee80211_wep_init(local); 883 884 if (result < 0) { 885 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n", 886 wiphy_name(local->hw.wiphy), result); 887 goto fail_wep; 888 } 889 890 local->mdev->select_queue = ieee80211_select_queue; 891 892 /* add one default STA interface if supported */ 893 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 894 result = ieee80211_if_add(local, "wlan%d", NULL, 895 NL80211_IFTYPE_STATION, NULL); 896 if (result) 897 printk(KERN_WARNING "%s: Failed to add default virtual iface\n", 898 wiphy_name(local->hw.wiphy)); 899 } 900 901 rtnl_unlock(); 902 903 ieee80211_led_init(local); 904 905 return 0; 906 907 fail_wep: 908 rate_control_deinitialize(local); 909 fail_rate: 910 unregister_netdevice(local->mdev); 911 local->mdev = NULL; 912 fail_dev: 913 rtnl_unlock(); 914 sta_info_stop(local); 915 fail_sta_info: 916 debugfs_hw_del(local); 917 destroy_workqueue(local->hw.workqueue); 918 fail_workqueue: 919 if (local->mdev) 920 free_netdev(local->mdev); 921 fail_mdev_alloc: 922 wiphy_unregister(local->hw.wiphy); 923 return result; 924 } 925 EXPORT_SYMBOL(ieee80211_register_hw); 926 927 void ieee80211_unregister_hw(struct ieee80211_hw *hw) 928 { 929 struct ieee80211_local *local = hw_to_local(hw); 930 931 tasklet_kill(&local->tx_pending_tasklet); 932 tasklet_kill(&local->tasklet); 933 934 rtnl_lock(); 935 936 /* 937 * At this point, interface list manipulations are fine 938 * because the driver cannot be handing us frames any 939 * more and the tasklet is killed. 940 */ 941 942 /* First, we remove all virtual interfaces. */ 943 ieee80211_remove_interfaces(local); 944 945 /* then, finally, remove the master interface */ 946 unregister_netdevice(local->mdev); 947 948 rtnl_unlock(); 949 950 ieee80211_rx_bss_list_deinit(local); 951 ieee80211_clear_tx_pending(local); 952 sta_info_stop(local); 953 rate_control_deinitialize(local); 954 debugfs_hw_del(local); 955 956 if (skb_queue_len(&local->skb_queue) 957 || skb_queue_len(&local->skb_queue_unreliable)) 958 printk(KERN_WARNING "%s: skb_queue not empty\n", 959 wiphy_name(local->hw.wiphy)); 960 skb_queue_purge(&local->skb_queue); 961 skb_queue_purge(&local->skb_queue_unreliable); 962 963 destroy_workqueue(local->hw.workqueue); 964 wiphy_unregister(local->hw.wiphy); 965 ieee80211_wep_free(local); 966 ieee80211_led_exit(local); 967 free_netdev(local->mdev); 968 } 969 EXPORT_SYMBOL(ieee80211_unregister_hw); 970 971 void ieee80211_free_hw(struct ieee80211_hw *hw) 972 { 973 struct ieee80211_local *local = hw_to_local(hw); 974 975 wiphy_free(local->hw.wiphy); 976 } 977 EXPORT_SYMBOL(ieee80211_free_hw); 978 979 static int __init ieee80211_init(void) 980 { 981 struct sk_buff *skb; 982 int ret; 983 984 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 985 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 986 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 987 988 ret = rc80211_minstrel_init(); 989 if (ret) 990 return ret; 991 992 ret = rc80211_pid_init(); 993 if (ret) 994 return ret; 995 996 ieee80211_debugfs_netdev_init(); 997 998 return 0; 999 } 1000 1001 static void __exit ieee80211_exit(void) 1002 { 1003 rc80211_pid_exit(); 1004 rc80211_minstrel_exit(); 1005 1006 /* 1007 * For key todo, it'll be empty by now but the work 1008 * might still be scheduled. 1009 */ 1010 flush_scheduled_work(); 1011 1012 if (mesh_allocated) 1013 ieee80211s_stop(); 1014 1015 ieee80211_debugfs_netdev_exit(); 1016 } 1017 1018 1019 subsys_initcall(ieee80211_init); 1020 module_exit(ieee80211_exit); 1021 1022 MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1023 MODULE_LICENSE("GPL"); 1024