main.c revision 42935ecaf4e784d0815afa9a7e5fe7e141157ca3
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 <linux/pm_qos_params.h> 25#include <net/net_namespace.h> 26#include <net/cfg80211.h> 27 28#include "ieee80211_i.h" 29#include "driver-ops.h" 30#include "rate.h" 31#include "mesh.h" 32#include "wep.h" 33#include "wme.h" 34#include "aes_ccm.h" 35#include "led.h" 36#include "cfg.h" 37#include "debugfs.h" 38#include "debugfs_netdev.h" 39 40/* 41 * For seeing transmitted packets on monitor interfaces 42 * we have a radiotap header too. 43 */ 44struct ieee80211_tx_status_rtap_hdr { 45 struct ieee80211_radiotap_header hdr; 46 u8 rate; 47 u8 padding_for_rate; 48 __le16 tx_flags; 49 u8 data_retries; 50} __attribute__ ((packed)); 51 52 53/* must be called under mdev tx lock */ 54void ieee80211_configure_filter(struct ieee80211_local *local) 55{ 56 unsigned int changed_flags; 57 unsigned int new_flags = 0; 58 59 if (atomic_read(&local->iff_promiscs)) 60 new_flags |= FIF_PROMISC_IN_BSS; 61 62 if (atomic_read(&local->iff_allmultis)) 63 new_flags |= FIF_ALLMULTI; 64 65 if (local->monitors) 66 new_flags |= FIF_BCN_PRBRESP_PROMISC; 67 68 if (local->fif_fcsfail) 69 new_flags |= FIF_FCSFAIL; 70 71 if (local->fif_plcpfail) 72 new_flags |= FIF_PLCPFAIL; 73 74 if (local->fif_control) 75 new_flags |= FIF_CONTROL; 76 77 if (local->fif_other_bss) 78 new_flags |= FIF_OTHER_BSS; 79 80 changed_flags = local->filter_flags ^ new_flags; 81 82 /* be a bit nasty */ 83 new_flags |= (1<<31); 84 85 drv_configure_filter(local, changed_flags, &new_flags, 86 local->mc_count, 87 local->mc_list); 88 89 WARN_ON(new_flags & (1<<31)); 90 91 local->filter_flags = new_flags & ~(1<<31); 92} 93 94int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 95{ 96 struct ieee80211_channel *chan, *scan_chan; 97 int ret = 0; 98 int power; 99 enum nl80211_channel_type channel_type; 100 101 might_sleep(); 102 103 scan_chan = local->scan_channel; 104 105 if (scan_chan) { 106 chan = scan_chan; 107 channel_type = NL80211_CHAN_NO_HT; 108 } else { 109 chan = local->oper_channel; 110 channel_type = local->oper_channel_type; 111 } 112 113 if (chan != local->hw.conf.channel || 114 channel_type != local->hw.conf.channel_type) { 115 local->hw.conf.channel = chan; 116 local->hw.conf.channel_type = channel_type; 117 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 118 } 119 120 if (scan_chan) 121 power = chan->max_power; 122 else 123 power = local->power_constr_level ? 124 (chan->max_power - local->power_constr_level) : 125 chan->max_power; 126 127 if (local->user_power_level >= 0) 128 power = min(power, local->user_power_level); 129 130 if (local->hw.conf.power_level != power) { 131 changed |= IEEE80211_CONF_CHANGE_POWER; 132 local->hw.conf.power_level = power; 133 } 134 135 if (changed && local->open_count) { 136 ret = drv_config(local, changed); 137 /* 138 * Goal: 139 * HW reconfiguration should never fail, the driver has told 140 * us what it can support so it should live up to that promise. 141 * 142 * Current status: 143 * rfkill is not integrated with mac80211 and a 144 * configuration command can thus fail if hardware rfkill 145 * is enabled 146 * 147 * FIXME: integrate rfkill with mac80211 and then add this 148 * WARN_ON() back 149 * 150 */ 151 /* WARN_ON(ret); */ 152 } 153 154 return ret; 155} 156 157void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 158 u32 changed) 159{ 160 struct ieee80211_local *local = sdata->local; 161 static const u8 zero[ETH_ALEN] = { 0 }; 162 163 if (!changed) 164 return; 165 166 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 167 /* 168 * While not associated, claim a BSSID of all-zeroes 169 * so that drivers don't do any weird things with the 170 * BSSID at that time. 171 */ 172 if (sdata->vif.bss_conf.assoc) 173 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 174 else 175 sdata->vif.bss_conf.bssid = zero; 176 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 177 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 178 else if (sdata->vif.type == NL80211_IFTYPE_AP) 179 sdata->vif.bss_conf.bssid = sdata->dev->dev_addr; 180 else if (ieee80211_vif_is_mesh(&sdata->vif)) { 181 sdata->vif.bss_conf.bssid = zero; 182 } else { 183 WARN_ON(1); 184 return; 185 } 186 187 switch (sdata->vif.type) { 188 case NL80211_IFTYPE_AP: 189 case NL80211_IFTYPE_ADHOC: 190 case NL80211_IFTYPE_MESH_POINT: 191 break; 192 default: 193 /* do not warn to simplify caller in scan.c */ 194 changed &= ~BSS_CHANGED_BEACON_ENABLED; 195 if (WARN_ON(changed & BSS_CHANGED_BEACON)) 196 return; 197 break; 198 } 199 200 if (changed & BSS_CHANGED_BEACON_ENABLED) { 201 if (local->quiescing || !netif_running(sdata->dev) || 202 test_bit(SCAN_SW_SCANNING, &local->scanning)) { 203 sdata->vif.bss_conf.enable_beacon = false; 204 } else { 205 /* 206 * Beacon should be enabled, but AP mode must 207 * check whether there is a beacon configured. 208 */ 209 switch (sdata->vif.type) { 210 case NL80211_IFTYPE_AP: 211 sdata->vif.bss_conf.enable_beacon = 212 !!rcu_dereference(sdata->u.ap.beacon); 213 break; 214 case NL80211_IFTYPE_ADHOC: 215 sdata->vif.bss_conf.enable_beacon = 216 !!rcu_dereference(sdata->u.ibss.presp); 217 break; 218 case NL80211_IFTYPE_MESH_POINT: 219 sdata->vif.bss_conf.enable_beacon = true; 220 break; 221 default: 222 /* not reached */ 223 WARN_ON(1); 224 break; 225 } 226 } 227 } 228 229 drv_bss_info_changed(local, &sdata->vif, 230 &sdata->vif.bss_conf, changed); 231 232 /* DEPRECATED */ 233 local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int; 234} 235 236u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 237{ 238 sdata->vif.bss_conf.use_cts_prot = false; 239 sdata->vif.bss_conf.use_short_preamble = false; 240 sdata->vif.bss_conf.use_short_slot = false; 241 return BSS_CHANGED_ERP_CTS_PROT | 242 BSS_CHANGED_ERP_PREAMBLE | 243 BSS_CHANGED_ERP_SLOT; 244} 245 246void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, 247 struct sk_buff *skb) 248{ 249 struct ieee80211_local *local = hw_to_local(hw); 250 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 251 int tmp; 252 253 skb->pkt_type = IEEE80211_TX_STATUS_MSG; 254 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ? 255 &local->skb_queue : &local->skb_queue_unreliable, skb); 256 tmp = skb_queue_len(&local->skb_queue) + 257 skb_queue_len(&local->skb_queue_unreliable); 258 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && 259 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 260 dev_kfree_skb_irq(skb); 261 tmp--; 262 I802_DEBUG_INC(local->tx_status_drop); 263 } 264 tasklet_schedule(&local->tasklet); 265} 266EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); 267 268static void ieee80211_tasklet_handler(unsigned long data) 269{ 270 struct ieee80211_local *local = (struct ieee80211_local *) data; 271 struct sk_buff *skb; 272 struct ieee80211_ra_tid *ra_tid; 273 274 while ((skb = skb_dequeue(&local->skb_queue)) || 275 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 276 switch (skb->pkt_type) { 277 case IEEE80211_RX_MSG: 278 /* Clear skb->pkt_type in order to not confuse kernel 279 * netstack. */ 280 skb->pkt_type = 0; 281 ieee80211_rx(local_to_hw(local), skb); 282 break; 283 case IEEE80211_TX_STATUS_MSG: 284 skb->pkt_type = 0; 285 ieee80211_tx_status(local_to_hw(local), skb); 286 break; 287 case IEEE80211_DELBA_MSG: 288 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 289 ieee80211_stop_tx_ba_cb(local_to_hw(local), 290 ra_tid->ra, ra_tid->tid); 291 dev_kfree_skb(skb); 292 break; 293 case IEEE80211_ADDBA_MSG: 294 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 295 ieee80211_start_tx_ba_cb(local_to_hw(local), 296 ra_tid->ra, ra_tid->tid); 297 dev_kfree_skb(skb); 298 break ; 299 default: 300 WARN(1, "mac80211: Packet is of unknown type %d\n", 301 skb->pkt_type); 302 dev_kfree_skb(skb); 303 break; 304 } 305 } 306} 307 308static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, 309 struct sta_info *sta, 310 struct sk_buff *skb) 311{ 312 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 313 314 /* 315 * XXX: This is temporary! 316 * 317 * The problem here is that when we get here, the driver will 318 * quite likely have pretty much overwritten info->control by 319 * using info->driver_data or info->rate_driver_data. Thus, 320 * when passing out the frame to the driver again, we would be 321 * passing completely bogus data since the driver would then 322 * expect a properly filled info->control. In mac80211 itself 323 * the same problem occurs, since we need info->control.vif 324 * internally. 325 * 326 * To fix this, we should send the frame through TX processing 327 * again. However, it's not that simple, since the frame will 328 * have been software-encrypted (if applicable) already, and 329 * encrypting it again doesn't do much good. So to properly do 330 * that, we not only have to skip the actual 'raw' encryption 331 * (key selection etc. still has to be done!) but also the 332 * sequence number assignment since that impacts the crypto 333 * encapsulation, of course. 334 * 335 * Hence, for now, fix the bug by just dropping the frame. 336 */ 337 goto drop; 338 339 sta->tx_filtered_count++; 340 341 /* 342 * Clear the TX filter mask for this STA when sending the next 343 * packet. If the STA went to power save mode, this will happen 344 * when it wakes up for the next time. 345 */ 346 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT); 347 348 /* 349 * This code races in the following way: 350 * 351 * (1) STA sends frame indicating it will go to sleep and does so 352 * (2) hardware/firmware adds STA to filter list, passes frame up 353 * (3) hardware/firmware processes TX fifo and suppresses a frame 354 * (4) we get TX status before having processed the frame and 355 * knowing that the STA has gone to sleep. 356 * 357 * This is actually quite unlikely even when both those events are 358 * processed from interrupts coming in quickly after one another or 359 * even at the same time because we queue both TX status events and 360 * RX frames to be processed by a tasklet and process them in the 361 * same order that they were received or TX status last. Hence, there 362 * is no race as long as the frame RX is processed before the next TX 363 * status, which drivers can ensure, see below. 364 * 365 * Note that this can only happen if the hardware or firmware can 366 * actually add STAs to the filter list, if this is done by the 367 * driver in response to set_tim() (which will only reduce the race 368 * this whole filtering tries to solve, not completely solve it) 369 * this situation cannot happen. 370 * 371 * To completely solve this race drivers need to make sure that they 372 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 373 * functions and 374 * (b) always process RX events before TX status events if ordering 375 * can be unknown, for example with different interrupt status 376 * bits. 377 */ 378 if (test_sta_flags(sta, WLAN_STA_PS) && 379 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) { 380 skb_queue_tail(&sta->tx_filtered, skb); 381 return; 382 } 383 384 if (!test_sta_flags(sta, WLAN_STA_PS) && 385 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) { 386 /* Software retry the packet once */ 387 info->flags |= IEEE80211_TX_INTFL_RETRIED; 388 ieee80211_add_pending_skb(local, skb); 389 return; 390 } 391 392 drop: 393#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 394 if (net_ratelimit()) 395 printk(KERN_DEBUG "%s: dropped TX filtered frame, " 396 "queue_len=%d PS=%d @%lu\n", 397 wiphy_name(local->hw.wiphy), 398 skb_queue_len(&sta->tx_filtered), 399 !!test_sta_flags(sta, WLAN_STA_PS), jiffies); 400#endif 401 dev_kfree_skb(skb); 402} 403 404void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 405{ 406 struct sk_buff *skb2; 407 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 408 struct ieee80211_local *local = hw_to_local(hw); 409 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 410 u16 frag, type; 411 __le16 fc; 412 struct ieee80211_supported_band *sband; 413 struct ieee80211_tx_status_rtap_hdr *rthdr; 414 struct ieee80211_sub_if_data *sdata; 415 struct net_device *prev_dev = NULL; 416 struct sta_info *sta; 417 int retry_count = -1, i; 418 419 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 420 /* the HW cannot have attempted that rate */ 421 if (i >= hw->max_rates) { 422 info->status.rates[i].idx = -1; 423 info->status.rates[i].count = 0; 424 } 425 426 retry_count += info->status.rates[i].count; 427 } 428 if (retry_count < 0) 429 retry_count = 0; 430 431 rcu_read_lock(); 432 433 sband = local->hw.wiphy->bands[info->band]; 434 435 sta = sta_info_get(local, hdr->addr1); 436 437 if (sta) { 438 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 439 test_sta_flags(sta, WLAN_STA_PS)) { 440 /* 441 * The STA is in power save mode, so assume 442 * that this TX packet failed because of that. 443 */ 444 ieee80211_handle_filtered_frame(local, sta, skb); 445 rcu_read_unlock(); 446 return; 447 } 448 449 fc = hdr->frame_control; 450 451 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 452 (ieee80211_is_data_qos(fc))) { 453 u16 tid, ssn; 454 u8 *qc; 455 456 qc = ieee80211_get_qos_ctl(hdr); 457 tid = qc[0] & 0xf; 458 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 459 & IEEE80211_SCTL_SEQ); 460 ieee80211_send_bar(sta->sdata, hdr->addr1, 461 tid, ssn); 462 } 463 464 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 465 ieee80211_handle_filtered_frame(local, sta, skb); 466 rcu_read_unlock(); 467 return; 468 } else { 469 if (!(info->flags & IEEE80211_TX_STAT_ACK)) 470 sta->tx_retry_failed++; 471 sta->tx_retry_count += retry_count; 472 } 473 474 rate_control_tx_status(local, sband, sta, skb); 475 } 476 477 rcu_read_unlock(); 478 479 ieee80211_led_tx(local, 0); 480 481 /* SNMP counters 482 * Fragments are passed to low-level drivers as separate skbs, so these 483 * are actually fragments, not frames. Update frame counters only for 484 * the first fragment of the frame. */ 485 486 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG; 487 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE; 488 489 if (info->flags & IEEE80211_TX_STAT_ACK) { 490 if (frag == 0) { 491 local->dot11TransmittedFrameCount++; 492 if (is_multicast_ether_addr(hdr->addr1)) 493 local->dot11MulticastTransmittedFrameCount++; 494 if (retry_count > 0) 495 local->dot11RetryCount++; 496 if (retry_count > 1) 497 local->dot11MultipleRetryCount++; 498 } 499 500 /* This counter shall be incremented for an acknowledged MPDU 501 * with an individual address in the address 1 field or an MPDU 502 * with a multicast address in the address 1 field of type Data 503 * or Management. */ 504 if (!is_multicast_ether_addr(hdr->addr1) || 505 type == IEEE80211_FTYPE_DATA || 506 type == IEEE80211_FTYPE_MGMT) 507 local->dot11TransmittedFragmentCount++; 508 } else { 509 if (frag == 0) 510 local->dot11FailedCount++; 511 } 512 513 /* this was a transmitted frame, but now we want to reuse it */ 514 skb_orphan(skb); 515 516 /* 517 * This is a bit racy but we can avoid a lot of work 518 * with this test... 519 */ 520 if (!local->monitors && !local->cooked_mntrs) { 521 dev_kfree_skb(skb); 522 return; 523 } 524 525 /* send frame to monitor interfaces now */ 526 527 if (skb_headroom(skb) < sizeof(*rthdr)) { 528 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n"); 529 dev_kfree_skb(skb); 530 return; 531 } 532 533 rthdr = (struct ieee80211_tx_status_rtap_hdr *) 534 skb_push(skb, sizeof(*rthdr)); 535 536 memset(rthdr, 0, sizeof(*rthdr)); 537 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); 538 rthdr->hdr.it_present = 539 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 540 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) | 541 (1 << IEEE80211_RADIOTAP_RATE)); 542 543 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 544 !is_multicast_ether_addr(hdr->addr1)) 545 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL); 546 547 /* 548 * XXX: Once radiotap gets the bitmap reset thing the vendor 549 * extensions proposal contains, we can actually report 550 * the whole set of tries we did. 551 */ 552 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || 553 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) 554 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS); 555 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 556 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS); 557 if (info->status.rates[0].idx >= 0 && 558 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) 559 rthdr->rate = sband->bitrates[ 560 info->status.rates[0].idx].bitrate / 5; 561 562 /* for now report the total retry_count */ 563 rthdr->data_retries = retry_count; 564 565 /* XXX: is this sufficient for BPF? */ 566 skb_set_mac_header(skb, 0); 567 skb->ip_summed = CHECKSUM_UNNECESSARY; 568 skb->pkt_type = PACKET_OTHERHOST; 569 skb->protocol = htons(ETH_P_802_2); 570 memset(skb->cb, 0, sizeof(skb->cb)); 571 572 rcu_read_lock(); 573 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 574 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 575 if (!netif_running(sdata->dev)) 576 continue; 577 578 if (prev_dev) { 579 skb2 = skb_clone(skb, GFP_ATOMIC); 580 if (skb2) { 581 skb2->dev = prev_dev; 582 netif_rx(skb2); 583 } 584 } 585 586 prev_dev = sdata->dev; 587 } 588 } 589 if (prev_dev) { 590 skb->dev = prev_dev; 591 netif_rx(skb); 592 skb = NULL; 593 } 594 rcu_read_unlock(); 595 dev_kfree_skb(skb); 596} 597EXPORT_SYMBOL(ieee80211_tx_status); 598 599static void ieee80211_restart_work(struct work_struct *work) 600{ 601 struct ieee80211_local *local = 602 container_of(work, struct ieee80211_local, restart_work); 603 604 rtnl_lock(); 605 ieee80211_reconfig(local); 606 rtnl_unlock(); 607} 608 609void ieee80211_restart_hw(struct ieee80211_hw *hw) 610{ 611 struct ieee80211_local *local = hw_to_local(hw); 612 613 /* use this reason, __ieee80211_resume will unblock it */ 614 ieee80211_stop_queues_by_reason(hw, 615 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 616 617 schedule_work(&local->restart_work); 618} 619EXPORT_SYMBOL(ieee80211_restart_hw); 620 621struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 622 const struct ieee80211_ops *ops) 623{ 624 struct ieee80211_local *local; 625 int priv_size, i; 626 struct wiphy *wiphy; 627 628 /* Ensure 32-byte alignment of our private data and hw private data. 629 * We use the wiphy priv data for both our ieee80211_local and for 630 * the driver's private data 631 * 632 * In memory it'll be like this: 633 * 634 * +-------------------------+ 635 * | struct wiphy | 636 * +-------------------------+ 637 * | struct ieee80211_local | 638 * +-------------------------+ 639 * | driver's private data | 640 * +-------------------------+ 641 * 642 */ 643 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; 644 645 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 646 647 if (!wiphy) 648 return NULL; 649 650 wiphy->netnsok = true; 651 wiphy->privid = mac80211_wiphy_privid; 652 653 /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */ 654 wiphy->bss_priv_size = sizeof(struct ieee80211_bss) - 655 sizeof(struct cfg80211_bss); 656 657 local = wiphy_priv(wiphy); 658 659 local->hw.wiphy = wiphy; 660 661 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 662 663 BUG_ON(!ops->tx); 664 BUG_ON(!ops->start); 665 BUG_ON(!ops->stop); 666 BUG_ON(!ops->config); 667 BUG_ON(!ops->add_interface); 668 BUG_ON(!ops->remove_interface); 669 BUG_ON(!ops->configure_filter); 670 local->ops = ops; 671 672 /* set up some defaults */ 673 local->hw.queues = 1; 674 local->hw.max_rates = 1; 675 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; 676 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; 677 local->hw.conf.radio_enabled = true; 678 local->user_power_level = -1; 679 680 INIT_LIST_HEAD(&local->interfaces); 681 mutex_init(&local->iflist_mtx); 682 mutex_init(&local->scan_mtx); 683 684 spin_lock_init(&local->key_lock); 685 spin_lock_init(&local->filter_lock); 686 spin_lock_init(&local->queue_stop_reason_lock); 687 688 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 689 690 INIT_WORK(&local->restart_work, ieee80211_restart_work); 691 692 INIT_WORK(&local->dynamic_ps_enable_work, 693 ieee80211_dynamic_ps_enable_work); 694 INIT_WORK(&local->dynamic_ps_disable_work, 695 ieee80211_dynamic_ps_disable_work); 696 setup_timer(&local->dynamic_ps_timer, 697 ieee80211_dynamic_ps_timer, (unsigned long) local); 698 699 sta_info_init(local); 700 701 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) 702 skb_queue_head_init(&local->pending[i]); 703 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 704 (unsigned long)local); 705 tasklet_disable(&local->tx_pending_tasklet); 706 707 tasklet_init(&local->tasklet, 708 ieee80211_tasklet_handler, 709 (unsigned long) local); 710 tasklet_disable(&local->tasklet); 711 712 skb_queue_head_init(&local->skb_queue); 713 skb_queue_head_init(&local->skb_queue_unreliable); 714 715 spin_lock_init(&local->ampdu_lock); 716 717 return local_to_hw(local); 718} 719EXPORT_SYMBOL(ieee80211_alloc_hw); 720 721int ieee80211_register_hw(struct ieee80211_hw *hw) 722{ 723 struct ieee80211_local *local = hw_to_local(hw); 724 int result; 725 enum ieee80211_band band; 726 int channels, i, j, max_bitrates; 727 bool supp_ht; 728 static const u32 cipher_suites[] = { 729 WLAN_CIPHER_SUITE_WEP40, 730 WLAN_CIPHER_SUITE_WEP104, 731 WLAN_CIPHER_SUITE_TKIP, 732 WLAN_CIPHER_SUITE_CCMP, 733 734 /* keep last -- depends on hw flags! */ 735 WLAN_CIPHER_SUITE_AES_CMAC 736 }; 737 738 /* 739 * generic code guarantees at least one band, 740 * set this very early because much code assumes 741 * that hw.conf.channel is assigned 742 */ 743 channels = 0; 744 max_bitrates = 0; 745 supp_ht = false; 746 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 747 struct ieee80211_supported_band *sband; 748 749 sband = local->hw.wiphy->bands[band]; 750 if (!sband) 751 continue; 752 if (!local->oper_channel) { 753 /* init channel we're on */ 754 local->hw.conf.channel = 755 local->oper_channel = &sband->channels[0]; 756 local->hw.conf.channel_type = NL80211_CHAN_NO_HT; 757 } 758 channels += sband->n_channels; 759 760 if (max_bitrates < sband->n_bitrates) 761 max_bitrates = sband->n_bitrates; 762 supp_ht = supp_ht || sband->ht_cap.ht_supported; 763 } 764 765 local->int_scan_req.n_channels = channels; 766 local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL); 767 if (!local->int_scan_req.channels) 768 return -ENOMEM; 769 770 /* if low-level driver supports AP, we also support VLAN */ 771 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) 772 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 773 774 /* mac80211 always supports monitor */ 775 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 776 777 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 778 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; 779 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 780 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; 781 782 /* 783 * Calculate scan IE length -- we need this to alloc 784 * memory and to subtract from the driver limit. It 785 * includes the (extended) supported rates and HT 786 * information -- SSID is the driver's responsibility. 787 */ 788 local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */ 789 if (supp_ht) 790 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); 791 792 if (!local->ops->hw_scan) { 793 /* For hw_scan, driver needs to set these up. */ 794 local->hw.wiphy->max_scan_ssids = 4; 795 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; 796 } 797 798 /* 799 * If the driver supports any scan IEs, then assume the 800 * limit includes the IEs mac80211 will add, otherwise 801 * leave it at zero and let the driver sort it out; we 802 * still pass our IEs to the driver but userspace will 803 * not be allowed to in that case. 804 */ 805 if (local->hw.wiphy->max_scan_ie_len) 806 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; 807 808 local->hw.wiphy->cipher_suites = cipher_suites; 809 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); 810 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) 811 local->hw.wiphy->n_cipher_suites--; 812 813 result = wiphy_register(local->hw.wiphy); 814 if (result < 0) 815 goto fail_wiphy_register; 816 817 /* 818 * We use the number of queues for feature tests (QoS, HT) internally 819 * so restrict them appropriately. 820 */ 821 if (hw->queues > IEEE80211_MAX_QUEUES) 822 hw->queues = IEEE80211_MAX_QUEUES; 823 824 local->workqueue = 825 create_singlethread_workqueue(wiphy_name(local->hw.wiphy)); 826 if (!local->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.max_listen_interval == 0) 842 local->hw.max_listen_interval = 1; 843 844 local->hw.conf.listen_interval = local->hw.max_listen_interval; 845 846 result = sta_info_start(local); 847 if (result < 0) 848 goto fail_sta_info; 849 850 result = ieee80211_wep_init(local); 851 if (result < 0) { 852 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n", 853 wiphy_name(local->hw.wiphy), result); 854 goto fail_wep; 855 } 856 857 rtnl_lock(); 858 859 result = ieee80211_init_rate_ctrl_alg(local, 860 hw->rate_control_algorithm); 861 if (result < 0) { 862 printk(KERN_DEBUG "%s: Failed to initialize rate control " 863 "algorithm\n", wiphy_name(local->hw.wiphy)); 864 goto fail_rate; 865 } 866 867 /* add one default STA interface if supported */ 868 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 869 result = ieee80211_if_add(local, "wlan%d", NULL, 870 NL80211_IFTYPE_STATION, NULL); 871 if (result) 872 printk(KERN_WARNING "%s: Failed to add default virtual iface\n", 873 wiphy_name(local->hw.wiphy)); 874 } 875 876 rtnl_unlock(); 877 878 ieee80211_led_init(local); 879 880 /* alloc internal scan request */ 881 i = 0; 882 local->int_scan_req.ssids = &local->scan_ssid; 883 local->int_scan_req.n_ssids = 1; 884 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 885 if (!hw->wiphy->bands[band]) 886 continue; 887 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) { 888 local->int_scan_req.channels[i] = 889 &hw->wiphy->bands[band]->channels[j]; 890 i++; 891 } 892 } 893 894 local->network_latency_notifier.notifier_call = 895 ieee80211_max_network_latency; 896 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, 897 &local->network_latency_notifier); 898 899 if (result) { 900 rtnl_lock(); 901 goto fail_pm_qos; 902 } 903 904 return 0; 905 906 fail_pm_qos: 907 ieee80211_led_exit(local); 908 ieee80211_remove_interfaces(local); 909 fail_rate: 910 rtnl_unlock(); 911 ieee80211_wep_free(local); 912 fail_wep: 913 sta_info_stop(local); 914 fail_sta_info: 915 debugfs_hw_del(local); 916 destroy_workqueue(local->workqueue); 917 fail_workqueue: 918 wiphy_unregister(local->hw.wiphy); 919 fail_wiphy_register: 920 kfree(local->int_scan_req.channels); 921 return result; 922} 923EXPORT_SYMBOL(ieee80211_register_hw); 924 925void ieee80211_unregister_hw(struct ieee80211_hw *hw) 926{ 927 struct ieee80211_local *local = hw_to_local(hw); 928 929 tasklet_kill(&local->tx_pending_tasklet); 930 tasklet_kill(&local->tasklet); 931 932 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 933 &local->network_latency_notifier); 934 935 rtnl_lock(); 936 937 /* 938 * At this point, interface list manipulations are fine 939 * because the driver cannot be handing us frames any 940 * more and the tasklet is killed. 941 */ 942 ieee80211_remove_interfaces(local); 943 944 rtnl_unlock(); 945 946 ieee80211_clear_tx_pending(local); 947 sta_info_stop(local); 948 rate_control_deinitialize(local); 949 debugfs_hw_del(local); 950 951 if (skb_queue_len(&local->skb_queue) 952 || skb_queue_len(&local->skb_queue_unreliable)) 953 printk(KERN_WARNING "%s: skb_queue not empty\n", 954 wiphy_name(local->hw.wiphy)); 955 skb_queue_purge(&local->skb_queue); 956 skb_queue_purge(&local->skb_queue_unreliable); 957 958 destroy_workqueue(local->workqueue); 959 wiphy_unregister(local->hw.wiphy); 960 ieee80211_wep_free(local); 961 ieee80211_led_exit(local); 962 kfree(local->int_scan_req.channels); 963} 964EXPORT_SYMBOL(ieee80211_unregister_hw); 965 966void ieee80211_free_hw(struct ieee80211_hw *hw) 967{ 968 struct ieee80211_local *local = hw_to_local(hw); 969 970 mutex_destroy(&local->iflist_mtx); 971 mutex_destroy(&local->scan_mtx); 972 973 wiphy_free(local->hw.wiphy); 974} 975EXPORT_SYMBOL(ieee80211_free_hw); 976 977static int __init ieee80211_init(void) 978{ 979 struct sk_buff *skb; 980 int ret; 981 982 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 983 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 984 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 985 986 ret = rc80211_minstrel_init(); 987 if (ret) 988 return ret; 989 990 ret = rc80211_pid_init(); 991 if (ret) 992 return ret; 993 994 ieee80211_debugfs_netdev_init(); 995 996 return 0; 997} 998 999static void __exit ieee80211_exit(void) 1000{ 1001 rc80211_pid_exit(); 1002 rc80211_minstrel_exit(); 1003 1004 /* 1005 * For key todo, it'll be empty by now but the work 1006 * might still be scheduled. 1007 */ 1008 flush_scheduled_work(); 1009 1010 if (mesh_allocated) 1011 ieee80211s_stop(); 1012 1013 ieee80211_debugfs_netdev_exit(); 1014} 1015 1016 1017subsys_initcall(ieee80211_init); 1018module_exit(ieee80211_exit); 1019 1020MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1021MODULE_LICENSE("GPL"); 1022