main.c revision 1ce8e7b57b3a4527ef83da1c5c7bd8a6b9d87b56
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->mdev->mc_count, 87 local->mdev->mc_list); 88 89 WARN_ON(new_flags & (1<<31)); 90 91 local->filter_flags = new_flags & ~(1<<31); 92} 93 94/* master interface */ 95 96static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr) 97{ 98 memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */ 99 return ETH_ALEN; 100} 101 102static const struct header_ops ieee80211_header_ops = { 103 .create = eth_header, 104 .parse = header_parse_80211, 105 .rebuild = eth_rebuild_header, 106 .cache = eth_header_cache, 107 .cache_update = eth_header_cache_update, 108}; 109 110static int ieee80211_master_open(struct net_device *dev) 111{ 112 struct ieee80211_master_priv *mpriv = netdev_priv(dev); 113 struct ieee80211_local *local = mpriv->local; 114 struct ieee80211_sub_if_data *sdata; 115 int res = -EOPNOTSUPP; 116 117 /* we hold the RTNL here so can safely walk the list */ 118 list_for_each_entry(sdata, &local->interfaces, list) { 119 if (netif_running(sdata->dev)) { 120 res = 0; 121 break; 122 } 123 } 124 125 if (res) 126 return res; 127 128 netif_tx_start_all_queues(local->mdev); 129 130 return 0; 131} 132 133static int ieee80211_master_stop(struct net_device *dev) 134{ 135 struct ieee80211_master_priv *mpriv = netdev_priv(dev); 136 struct ieee80211_local *local = mpriv->local; 137 struct ieee80211_sub_if_data *sdata; 138 139 /* we hold the RTNL here so can safely walk the list */ 140 list_for_each_entry(sdata, &local->interfaces, list) 141 if (netif_running(sdata->dev)) 142 dev_close(sdata->dev); 143 144 return 0; 145} 146 147static void ieee80211_master_set_multicast_list(struct net_device *dev) 148{ 149 struct ieee80211_master_priv *mpriv = netdev_priv(dev); 150 struct ieee80211_local *local = mpriv->local; 151 152 ieee80211_configure_filter(local); 153} 154 155int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 156{ 157 struct ieee80211_channel *chan, *scan_chan; 158 int ret = 0; 159 int power; 160 enum nl80211_channel_type channel_type; 161 162 might_sleep(); 163 164 scan_chan = local->scan_channel; 165 166 if (scan_chan) { 167 chan = scan_chan; 168 channel_type = NL80211_CHAN_NO_HT; 169 } else { 170 chan = local->oper_channel; 171 channel_type = local->oper_channel_type; 172 } 173 174 if (chan != local->hw.conf.channel || 175 channel_type != local->hw.conf.channel_type) { 176 local->hw.conf.channel = chan; 177 local->hw.conf.channel_type = channel_type; 178 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 179 } 180 181 if (scan_chan) 182 power = chan->max_power; 183 else 184 power = local->power_constr_level ? 185 (chan->max_power - local->power_constr_level) : 186 chan->max_power; 187 188 if (local->user_power_level >= 0) 189 power = min(power, local->user_power_level); 190 191 if (local->hw.conf.power_level != power) { 192 changed |= IEEE80211_CONF_CHANGE_POWER; 193 local->hw.conf.power_level = power; 194 } 195 196 if (changed && local->open_count) { 197 ret = drv_config(local, changed); 198 /* 199 * Goal: 200 * HW reconfiguration should never fail, the driver has told 201 * us what it can support so it should live up to that promise. 202 * 203 * Current status: 204 * rfkill is not integrated with mac80211 and a 205 * configuration command can thus fail if hardware rfkill 206 * is enabled 207 * 208 * FIXME: integrate rfkill with mac80211 and then add this 209 * WARN_ON() back 210 * 211 */ 212 /* WARN_ON(ret); */ 213 } 214 215 return ret; 216} 217 218void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 219 u32 changed) 220{ 221 struct ieee80211_local *local = sdata->local; 222 static const u8 zero[ETH_ALEN] = { 0 }; 223 224 if (!changed) 225 return; 226 227 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 228 /* 229 * While not associated, claim a BSSID of all-zeroes 230 * so that drivers don't do any weird things with the 231 * BSSID at that time. 232 */ 233 if (sdata->vif.bss_conf.assoc) 234 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 235 else 236 sdata->vif.bss_conf.bssid = zero; 237 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 238 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 239 else if (sdata->vif.type == NL80211_IFTYPE_AP) 240 sdata->vif.bss_conf.bssid = sdata->dev->dev_addr; 241 else if (ieee80211_vif_is_mesh(&sdata->vif)) { 242 sdata->vif.bss_conf.bssid = zero; 243 } else { 244 WARN_ON(1); 245 return; 246 } 247 248 switch (sdata->vif.type) { 249 case NL80211_IFTYPE_AP: 250 case NL80211_IFTYPE_ADHOC: 251 case NL80211_IFTYPE_MESH_POINT: 252 break; 253 default: 254 /* do not warn to simplify caller in scan.c */ 255 changed &= ~BSS_CHANGED_BEACON_ENABLED; 256 if (WARN_ON(changed & BSS_CHANGED_BEACON)) 257 return; 258 break; 259 } 260 261 if (changed & BSS_CHANGED_BEACON_ENABLED) { 262 if (local->sw_scanning) { 263 sdata->vif.bss_conf.enable_beacon = false; 264 } else { 265 /* 266 * Beacon should be enabled, but AP mode must 267 * check whether there is a beacon configured. 268 */ 269 switch (sdata->vif.type) { 270 case NL80211_IFTYPE_AP: 271 sdata->vif.bss_conf.enable_beacon = 272 !!rcu_dereference(sdata->u.ap.beacon); 273 break; 274 case NL80211_IFTYPE_ADHOC: 275 sdata->vif.bss_conf.enable_beacon = 276 !!rcu_dereference(sdata->u.ibss.presp); 277 break; 278 case NL80211_IFTYPE_MESH_POINT: 279 sdata->vif.bss_conf.enable_beacon = true; 280 break; 281 default: 282 /* not reached */ 283 WARN_ON(1); 284 break; 285 } 286 } 287 } 288 289 drv_bss_info_changed(local, &sdata->vif, 290 &sdata->vif.bss_conf, changed); 291 292 /* 293 * DEPRECATED 294 * 295 * ~changed is just there to not do this at resume time 296 */ 297 if (changed & BSS_CHANGED_BEACON_INT && ~changed) { 298 local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int; 299 ieee80211_hw_config(local, 300 _IEEE80211_CONF_CHANGE_BEACON_INTERVAL); 301 } 302} 303 304u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 305{ 306 sdata->vif.bss_conf.use_cts_prot = false; 307 sdata->vif.bss_conf.use_short_preamble = false; 308 sdata->vif.bss_conf.use_short_slot = false; 309 return BSS_CHANGED_ERP_CTS_PROT | 310 BSS_CHANGED_ERP_PREAMBLE | 311 BSS_CHANGED_ERP_SLOT; 312} 313 314void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, 315 struct sk_buff *skb) 316{ 317 struct ieee80211_local *local = hw_to_local(hw); 318 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 319 int tmp; 320 321 skb->dev = local->mdev; 322 skb->pkt_type = IEEE80211_TX_STATUS_MSG; 323 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ? 324 &local->skb_queue : &local->skb_queue_unreliable, skb); 325 tmp = skb_queue_len(&local->skb_queue) + 326 skb_queue_len(&local->skb_queue_unreliable); 327 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && 328 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 329 dev_kfree_skb_irq(skb); 330 tmp--; 331 I802_DEBUG_INC(local->tx_status_drop); 332 } 333 tasklet_schedule(&local->tasklet); 334} 335EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); 336 337static void ieee80211_tasklet_handler(unsigned long data) 338{ 339 struct ieee80211_local *local = (struct ieee80211_local *) data; 340 struct sk_buff *skb; 341 struct ieee80211_rx_status rx_status; 342 struct ieee80211_ra_tid *ra_tid; 343 344 while ((skb = skb_dequeue(&local->skb_queue)) || 345 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 346 switch (skb->pkt_type) { 347 case IEEE80211_RX_MSG: 348 /* status is in skb->cb */ 349 memcpy(&rx_status, skb->cb, sizeof(rx_status)); 350 /* Clear skb->pkt_type in order to not confuse kernel 351 * netstack. */ 352 skb->pkt_type = 0; 353 __ieee80211_rx(local_to_hw(local), skb, &rx_status); 354 break; 355 case IEEE80211_TX_STATUS_MSG: 356 skb->pkt_type = 0; 357 ieee80211_tx_status(local_to_hw(local), skb); 358 break; 359 case IEEE80211_DELBA_MSG: 360 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 361 ieee80211_stop_tx_ba_cb(local_to_hw(local), 362 ra_tid->ra, ra_tid->tid); 363 dev_kfree_skb(skb); 364 break; 365 case IEEE80211_ADDBA_MSG: 366 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 367 ieee80211_start_tx_ba_cb(local_to_hw(local), 368 ra_tid->ra, ra_tid->tid); 369 dev_kfree_skb(skb); 370 break ; 371 default: 372 WARN(1, "mac80211: Packet is of unknown type %d\n", 373 skb->pkt_type); 374 dev_kfree_skb(skb); 375 break; 376 } 377 } 378} 379 380/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to 381 * make a prepared TX frame (one that has been given to hw) to look like brand 382 * new IEEE 802.11 frame that is ready to go through TX processing again. 383 */ 384static void ieee80211_remove_tx_extra(struct ieee80211_local *local, 385 struct ieee80211_key *key, 386 struct sk_buff *skb) 387{ 388 unsigned int hdrlen, iv_len, mic_len; 389 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 390 391 hdrlen = ieee80211_hdrlen(hdr->frame_control); 392 393 if (!key) 394 goto no_key; 395 396 switch (key->conf.alg) { 397 case ALG_WEP: 398 iv_len = WEP_IV_LEN; 399 mic_len = WEP_ICV_LEN; 400 break; 401 case ALG_TKIP: 402 iv_len = TKIP_IV_LEN; 403 mic_len = TKIP_ICV_LEN; 404 break; 405 case ALG_CCMP: 406 iv_len = CCMP_HDR_LEN; 407 mic_len = CCMP_MIC_LEN; 408 break; 409 default: 410 goto no_key; 411 } 412 413 if (skb->len >= hdrlen + mic_len && 414 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 415 skb_trim(skb, skb->len - mic_len); 416 if (skb->len >= hdrlen + iv_len) { 417 memmove(skb->data + iv_len, skb->data, hdrlen); 418 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len); 419 } 420 421no_key: 422 if (ieee80211_is_data_qos(hdr->frame_control)) { 423 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 424 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data, 425 hdrlen - IEEE80211_QOS_CTL_LEN); 426 skb_pull(skb, IEEE80211_QOS_CTL_LEN); 427 } 428} 429 430static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, 431 struct sta_info *sta, 432 struct sk_buff *skb) 433{ 434 sta->tx_filtered_count++; 435 436 /* 437 * Clear the TX filter mask for this STA when sending the next 438 * packet. If the STA went to power save mode, this will happen 439 * when it wakes up for the next time. 440 */ 441 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT); 442 443 /* 444 * This code races in the following way: 445 * 446 * (1) STA sends frame indicating it will go to sleep and does so 447 * (2) hardware/firmware adds STA to filter list, passes frame up 448 * (3) hardware/firmware processes TX fifo and suppresses a frame 449 * (4) we get TX status before having processed the frame and 450 * knowing that the STA has gone to sleep. 451 * 452 * This is actually quite unlikely even when both those events are 453 * processed from interrupts coming in quickly after one another or 454 * even at the same time because we queue both TX status events and 455 * RX frames to be processed by a tasklet and process them in the 456 * same order that they were received or TX status last. Hence, there 457 * is no race as long as the frame RX is processed before the next TX 458 * status, which drivers can ensure, see below. 459 * 460 * Note that this can only happen if the hardware or firmware can 461 * actually add STAs to the filter list, if this is done by the 462 * driver in response to set_tim() (which will only reduce the race 463 * this whole filtering tries to solve, not completely solve it) 464 * this situation cannot happen. 465 * 466 * To completely solve this race drivers need to make sure that they 467 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 468 * functions and 469 * (b) always process RX events before TX status events if ordering 470 * can be unknown, for example with different interrupt status 471 * bits. 472 */ 473 if (test_sta_flags(sta, WLAN_STA_PS) && 474 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) { 475 ieee80211_remove_tx_extra(local, sta->key, skb); 476 skb_queue_tail(&sta->tx_filtered, skb); 477 return; 478 } 479 480 if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) { 481 /* Software retry the packet once */ 482 skb->requeue = 1; 483 ieee80211_remove_tx_extra(local, sta->key, skb); 484 dev_queue_xmit(skb); 485 return; 486 } 487 488#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 489 if (net_ratelimit()) 490 printk(KERN_DEBUG "%s: dropped TX filtered frame, " 491 "queue_len=%d PS=%d @%lu\n", 492 wiphy_name(local->hw.wiphy), 493 skb_queue_len(&sta->tx_filtered), 494 !!test_sta_flags(sta, WLAN_STA_PS), jiffies); 495#endif 496 dev_kfree_skb(skb); 497} 498 499void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 500{ 501 struct sk_buff *skb2; 502 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 503 struct ieee80211_local *local = hw_to_local(hw); 504 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 505 u16 frag, type; 506 __le16 fc; 507 struct ieee80211_supported_band *sband; 508 struct ieee80211_tx_status_rtap_hdr *rthdr; 509 struct ieee80211_sub_if_data *sdata; 510 struct net_device *prev_dev = NULL; 511 struct sta_info *sta; 512 int retry_count = -1, i; 513 514 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 515 /* the HW cannot have attempted that rate */ 516 if (i >= hw->max_rates) { 517 info->status.rates[i].idx = -1; 518 info->status.rates[i].count = 0; 519 } 520 521 retry_count += info->status.rates[i].count; 522 } 523 if (retry_count < 0) 524 retry_count = 0; 525 526 rcu_read_lock(); 527 528 sband = local->hw.wiphy->bands[info->band]; 529 530 sta = sta_info_get(local, hdr->addr1); 531 532 if (sta) { 533 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 534 test_sta_flags(sta, WLAN_STA_PS)) { 535 /* 536 * The STA is in power save mode, so assume 537 * that this TX packet failed because of that. 538 */ 539 ieee80211_handle_filtered_frame(local, sta, skb); 540 rcu_read_unlock(); 541 return; 542 } 543 544 fc = hdr->frame_control; 545 546 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 547 (ieee80211_is_data_qos(fc))) { 548 u16 tid, ssn; 549 u8 *qc; 550 551 qc = ieee80211_get_qos_ctl(hdr); 552 tid = qc[0] & 0xf; 553 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 554 & IEEE80211_SCTL_SEQ); 555 ieee80211_send_bar(sta->sdata, hdr->addr1, 556 tid, ssn); 557 } 558 559 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 560 ieee80211_handle_filtered_frame(local, sta, skb); 561 rcu_read_unlock(); 562 return; 563 } else { 564 if (!(info->flags & IEEE80211_TX_STAT_ACK)) 565 sta->tx_retry_failed++; 566 sta->tx_retry_count += retry_count; 567 } 568 569 rate_control_tx_status(local, sband, sta, skb); 570 } 571 572 rcu_read_unlock(); 573 574 ieee80211_led_tx(local, 0); 575 576 /* SNMP counters 577 * Fragments are passed to low-level drivers as separate skbs, so these 578 * are actually fragments, not frames. Update frame counters only for 579 * the first fragment of the frame. */ 580 581 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG; 582 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE; 583 584 if (info->flags & IEEE80211_TX_STAT_ACK) { 585 if (frag == 0) { 586 local->dot11TransmittedFrameCount++; 587 if (is_multicast_ether_addr(hdr->addr1)) 588 local->dot11MulticastTransmittedFrameCount++; 589 if (retry_count > 0) 590 local->dot11RetryCount++; 591 if (retry_count > 1) 592 local->dot11MultipleRetryCount++; 593 } 594 595 /* This counter shall be incremented for an acknowledged MPDU 596 * with an individual address in the address 1 field or an MPDU 597 * with a multicast address in the address 1 field of type Data 598 * or Management. */ 599 if (!is_multicast_ether_addr(hdr->addr1) || 600 type == IEEE80211_FTYPE_DATA || 601 type == IEEE80211_FTYPE_MGMT) 602 local->dot11TransmittedFragmentCount++; 603 } else { 604 if (frag == 0) 605 local->dot11FailedCount++; 606 } 607 608 /* this was a transmitted frame, but now we want to reuse it */ 609 skb_orphan(skb); 610 611 /* 612 * This is a bit racy but we can avoid a lot of work 613 * with this test... 614 */ 615 if (!local->monitors && !local->cooked_mntrs) { 616 dev_kfree_skb(skb); 617 return; 618 } 619 620 /* send frame to monitor interfaces now */ 621 622 if (skb_headroom(skb) < sizeof(*rthdr)) { 623 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n"); 624 dev_kfree_skb(skb); 625 return; 626 } 627 628 rthdr = (struct ieee80211_tx_status_rtap_hdr *) 629 skb_push(skb, sizeof(*rthdr)); 630 631 memset(rthdr, 0, sizeof(*rthdr)); 632 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); 633 rthdr->hdr.it_present = 634 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 635 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) | 636 (1 << IEEE80211_RADIOTAP_RATE)); 637 638 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 639 !is_multicast_ether_addr(hdr->addr1)) 640 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL); 641 642 /* 643 * XXX: Once radiotap gets the bitmap reset thing the vendor 644 * extensions proposal contains, we can actually report 645 * the whole set of tries we did. 646 */ 647 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || 648 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) 649 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS); 650 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 651 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS); 652 if (info->status.rates[0].idx >= 0 && 653 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) 654 rthdr->rate = sband->bitrates[ 655 info->status.rates[0].idx].bitrate / 5; 656 657 /* for now report the total retry_count */ 658 rthdr->data_retries = retry_count; 659 660 /* XXX: is this sufficient for BPF? */ 661 skb_set_mac_header(skb, 0); 662 skb->ip_summed = CHECKSUM_UNNECESSARY; 663 skb->pkt_type = PACKET_OTHERHOST; 664 skb->protocol = htons(ETH_P_802_2); 665 memset(skb->cb, 0, sizeof(skb->cb)); 666 667 rcu_read_lock(); 668 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 669 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 670 if (!netif_running(sdata->dev)) 671 continue; 672 673 if (prev_dev) { 674 skb2 = skb_clone(skb, GFP_ATOMIC); 675 if (skb2) { 676 skb2->dev = prev_dev; 677 netif_rx(skb2); 678 } 679 } 680 681 prev_dev = sdata->dev; 682 } 683 } 684 if (prev_dev) { 685 skb->dev = prev_dev; 686 netif_rx(skb); 687 skb = NULL; 688 } 689 rcu_read_unlock(); 690 dev_kfree_skb(skb); 691} 692EXPORT_SYMBOL(ieee80211_tx_status); 693 694static void ieee80211_restart_work(struct work_struct *work) 695{ 696 struct ieee80211_local *local = 697 container_of(work, struct ieee80211_local, restart_work); 698 699 rtnl_lock(); 700 ieee80211_reconfig(local); 701 rtnl_unlock(); 702} 703 704void ieee80211_restart_hw(struct ieee80211_hw *hw) 705{ 706 struct ieee80211_local *local = hw_to_local(hw); 707 708 /* use this reason, __ieee80211_resume will unblock it */ 709 ieee80211_stop_queues_by_reason(hw, 710 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 711 712 schedule_work(&local->restart_work); 713} 714EXPORT_SYMBOL(ieee80211_restart_hw); 715 716struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 717 const struct ieee80211_ops *ops) 718{ 719 struct ieee80211_local *local; 720 int priv_size, i; 721 struct wiphy *wiphy; 722 723 /* Ensure 32-byte alignment of our private data and hw private data. 724 * We use the wiphy priv data for both our ieee80211_local and for 725 * the driver's private data 726 * 727 * In memory it'll be like this: 728 * 729 * +-------------------------+ 730 * | struct wiphy | 731 * +-------------------------+ 732 * | struct ieee80211_local | 733 * +-------------------------+ 734 * | driver's private data | 735 * +-------------------------+ 736 * 737 */ 738 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; 739 740 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 741 742 if (!wiphy) 743 return NULL; 744 745 wiphy->privid = mac80211_wiphy_privid; 746 747 /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */ 748 wiphy->bss_priv_size = sizeof(struct ieee80211_bss) - 749 sizeof(struct cfg80211_bss); 750 751 local = wiphy_priv(wiphy); 752 753 local->hw.wiphy = wiphy; 754 755 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 756 757 BUG_ON(!ops->tx); 758 BUG_ON(!ops->start); 759 BUG_ON(!ops->stop); 760 BUG_ON(!ops->config); 761 BUG_ON(!ops->add_interface); 762 BUG_ON(!ops->remove_interface); 763 BUG_ON(!ops->configure_filter); 764 local->ops = ops; 765 766 /* set up some defaults */ 767 local->hw.queues = 1; 768 local->hw.max_rates = 1; 769 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; 770 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; 771 local->hw.conf.radio_enabled = true; 772 local->user_power_level = -1; 773 774 INIT_LIST_HEAD(&local->interfaces); 775 mutex_init(&local->iflist_mtx); 776 mutex_init(&local->scan_mtx); 777 778 spin_lock_init(&local->key_lock); 779 780 spin_lock_init(&local->queue_stop_reason_lock); 781 782 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 783 784 INIT_WORK(&local->restart_work, ieee80211_restart_work); 785 786 INIT_WORK(&local->dynamic_ps_enable_work, 787 ieee80211_dynamic_ps_enable_work); 788 INIT_WORK(&local->dynamic_ps_disable_work, 789 ieee80211_dynamic_ps_disable_work); 790 setup_timer(&local->dynamic_ps_timer, 791 ieee80211_dynamic_ps_timer, (unsigned long) local); 792 793 sta_info_init(local); 794 795 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) 796 skb_queue_head_init(&local->pending[i]); 797 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 798 (unsigned long)local); 799 tasklet_disable(&local->tx_pending_tasklet); 800 801 tasklet_init(&local->tasklet, 802 ieee80211_tasklet_handler, 803 (unsigned long) local); 804 tasklet_disable(&local->tasklet); 805 806 skb_queue_head_init(&local->skb_queue); 807 skb_queue_head_init(&local->skb_queue_unreliable); 808 809 spin_lock_init(&local->ampdu_lock); 810 811 return local_to_hw(local); 812} 813EXPORT_SYMBOL(ieee80211_alloc_hw); 814 815static const struct net_device_ops ieee80211_master_ops = { 816 .ndo_start_xmit = ieee80211_master_start_xmit, 817 .ndo_open = ieee80211_master_open, 818 .ndo_stop = ieee80211_master_stop, 819 .ndo_set_multicast_list = ieee80211_master_set_multicast_list, 820 .ndo_select_queue = ieee80211_select_queue, 821}; 822 823static void ieee80211_master_setup(struct net_device *mdev) 824{ 825 mdev->type = ARPHRD_IEEE80211; 826 mdev->netdev_ops = &ieee80211_master_ops; 827 mdev->header_ops = &ieee80211_header_ops; 828 mdev->tx_queue_len = 1000; 829 mdev->addr_len = ETH_ALEN; 830} 831 832int ieee80211_register_hw(struct ieee80211_hw *hw) 833{ 834 struct ieee80211_local *local = hw_to_local(hw); 835 int result; 836 enum ieee80211_band band; 837 struct net_device *mdev; 838 struct ieee80211_master_priv *mpriv; 839 int channels, i, j, max_bitrates; 840 bool supp_ht; 841 static const u32 cipher_suites[] = { 842 WLAN_CIPHER_SUITE_WEP40, 843 WLAN_CIPHER_SUITE_WEP104, 844 WLAN_CIPHER_SUITE_TKIP, 845 WLAN_CIPHER_SUITE_CCMP, 846 847 /* keep last -- depends on hw flags! */ 848 WLAN_CIPHER_SUITE_AES_CMAC 849 }; 850 851 /* 852 * generic code guarantees at least one band, 853 * set this very early because much code assumes 854 * that hw.conf.channel is assigned 855 */ 856 channels = 0; 857 max_bitrates = 0; 858 supp_ht = false; 859 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 860 struct ieee80211_supported_band *sband; 861 862 sband = local->hw.wiphy->bands[band]; 863 if (!sband) 864 continue; 865 if (!local->oper_channel) { 866 /* init channel we're on */ 867 local->hw.conf.channel = 868 local->oper_channel = &sband->channels[0]; 869 local->hw.conf.channel_type = NL80211_CHAN_NO_HT; 870 } 871 channels += sband->n_channels; 872 873 if (max_bitrates < sband->n_bitrates) 874 max_bitrates = sband->n_bitrates; 875 supp_ht = supp_ht || sband->ht_cap.ht_supported; 876 } 877 878 local->int_scan_req.n_channels = channels; 879 local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL); 880 if (!local->int_scan_req.channels) 881 return -ENOMEM; 882 883 /* if low-level driver supports AP, we also support VLAN */ 884 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) 885 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 886 887 /* mac80211 always supports monitor */ 888 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 889 890 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 891 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; 892 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 893 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; 894 895 /* 896 * Calculate scan IE length -- we need this to alloc 897 * memory and to subtract from the driver limit. It 898 * includes the (extended) supported rates and HT 899 * information -- SSID is the driver's responsibility. 900 */ 901 local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */ 902 if (supp_ht) 903 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); 904 905 if (!local->ops->hw_scan) { 906 /* For hw_scan, driver needs to set these up. */ 907 local->hw.wiphy->max_scan_ssids = 4; 908 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; 909 } 910 911 /* 912 * If the driver supports any scan IEs, then assume the 913 * limit includes the IEs mac80211 will add, otherwise 914 * leave it at zero and let the driver sort it out; we 915 * still pass our IEs to the driver but userspace will 916 * not be allowed to in that case. 917 */ 918 if (local->hw.wiphy->max_scan_ie_len) 919 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; 920 921 local->hw.wiphy->cipher_suites = cipher_suites; 922 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); 923 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) 924 local->hw.wiphy->n_cipher_suites--; 925 926 result = wiphy_register(local->hw.wiphy); 927 if (result < 0) 928 goto fail_wiphy_register; 929 930 /* 931 * We use the number of queues for feature tests (QoS, HT) internally 932 * so restrict them appropriately. 933 */ 934 if (hw->queues > IEEE80211_MAX_QUEUES) 935 hw->queues = IEEE80211_MAX_QUEUES; 936 937 mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv), 938 "wmaster%d", ieee80211_master_setup, 939 hw->queues); 940 if (!mdev) 941 goto fail_mdev_alloc; 942 943 mpriv = netdev_priv(mdev); 944 mpriv->local = local; 945 local->mdev = mdev; 946 947 local->hw.workqueue = 948 create_singlethread_workqueue(wiphy_name(local->hw.wiphy)); 949 if (!local->hw.workqueue) { 950 result = -ENOMEM; 951 goto fail_workqueue; 952 } 953 954 /* 955 * The hardware needs headroom for sending the frame, 956 * and we need some headroom for passing the frame to monitor 957 * interfaces, but never both at the same time. 958 */ 959 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 960 sizeof(struct ieee80211_tx_status_rtap_hdr)); 961 962 debugfs_hw_add(local); 963 964 if (local->hw.max_listen_interval == 0) 965 local->hw.max_listen_interval = 1; 966 967 local->hw.conf.listen_interval = local->hw.max_listen_interval; 968 969 result = sta_info_start(local); 970 if (result < 0) 971 goto fail_sta_info; 972 973 result = ieee80211_wep_init(local); 974 if (result < 0) { 975 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n", 976 wiphy_name(local->hw.wiphy), result); 977 goto fail_wep; 978 } 979 980 rtnl_lock(); 981 result = dev_alloc_name(local->mdev, local->mdev->name); 982 if (result < 0) 983 goto fail_dev; 984 985 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 986 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy)); 987 local->mdev->features |= NETIF_F_NETNS_LOCAL; 988 989 result = register_netdevice(local->mdev); 990 if (result < 0) 991 goto fail_dev; 992 993 result = ieee80211_init_rate_ctrl_alg(local, 994 hw->rate_control_algorithm); 995 if (result < 0) { 996 printk(KERN_DEBUG "%s: Failed to initialize rate control " 997 "algorithm\n", wiphy_name(local->hw.wiphy)); 998 goto fail_rate; 999 } 1000 1001 /* add one default STA interface if supported */ 1002 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 1003 result = ieee80211_if_add(local, "wlan%d", NULL, 1004 NL80211_IFTYPE_STATION, NULL); 1005 if (result) 1006 printk(KERN_WARNING "%s: Failed to add default virtual iface\n", 1007 wiphy_name(local->hw.wiphy)); 1008 } 1009 1010 rtnl_unlock(); 1011 1012 ieee80211_led_init(local); 1013 1014 /* alloc internal scan request */ 1015 i = 0; 1016 local->int_scan_req.ssids = &local->scan_ssid; 1017 local->int_scan_req.n_ssids = 1; 1018 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 1019 if (!hw->wiphy->bands[band]) 1020 continue; 1021 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) { 1022 local->int_scan_req.channels[i] = 1023 &hw->wiphy->bands[band]->channels[j]; 1024 i++; 1025 } 1026 } 1027 1028 local->network_latency_notifier.notifier_call = 1029 ieee80211_max_network_latency; 1030 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, 1031 &local->network_latency_notifier); 1032 1033 if (result) { 1034 rtnl_lock(); 1035 goto fail_pm_qos; 1036 } 1037 1038 return 0; 1039 1040 fail_pm_qos: 1041 ieee80211_led_exit(local); 1042 ieee80211_remove_interfaces(local); 1043 fail_rate: 1044 unregister_netdevice(local->mdev); 1045 local->mdev = NULL; 1046 fail_dev: 1047 rtnl_unlock(); 1048 ieee80211_wep_free(local); 1049 fail_wep: 1050 sta_info_stop(local); 1051 fail_sta_info: 1052 debugfs_hw_del(local); 1053 destroy_workqueue(local->hw.workqueue); 1054 fail_workqueue: 1055 if (local->mdev) 1056 free_netdev(local->mdev); 1057 fail_mdev_alloc: 1058 wiphy_unregister(local->hw.wiphy); 1059 fail_wiphy_register: 1060 kfree(local->int_scan_req.channels); 1061 return result; 1062} 1063EXPORT_SYMBOL(ieee80211_register_hw); 1064 1065void ieee80211_unregister_hw(struct ieee80211_hw *hw) 1066{ 1067 struct ieee80211_local *local = hw_to_local(hw); 1068 1069 tasklet_kill(&local->tx_pending_tasklet); 1070 tasklet_kill(&local->tasklet); 1071 1072 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 1073 &local->network_latency_notifier); 1074 1075 rtnl_lock(); 1076 1077 /* 1078 * At this point, interface list manipulations are fine 1079 * because the driver cannot be handing us frames any 1080 * more and the tasklet is killed. 1081 */ 1082 1083 /* First, we remove all virtual interfaces. */ 1084 ieee80211_remove_interfaces(local); 1085 1086 /* then, finally, remove the master interface */ 1087 unregister_netdevice(local->mdev); 1088 1089 rtnl_unlock(); 1090 1091 ieee80211_clear_tx_pending(local); 1092 sta_info_stop(local); 1093 rate_control_deinitialize(local); 1094 debugfs_hw_del(local); 1095 1096 if (skb_queue_len(&local->skb_queue) 1097 || skb_queue_len(&local->skb_queue_unreliable)) 1098 printk(KERN_WARNING "%s: skb_queue not empty\n", 1099 wiphy_name(local->hw.wiphy)); 1100 skb_queue_purge(&local->skb_queue); 1101 skb_queue_purge(&local->skb_queue_unreliable); 1102 1103 destroy_workqueue(local->hw.workqueue); 1104 wiphy_unregister(local->hw.wiphy); 1105 ieee80211_wep_free(local); 1106 ieee80211_led_exit(local); 1107 free_netdev(local->mdev); 1108 kfree(local->int_scan_req.channels); 1109} 1110EXPORT_SYMBOL(ieee80211_unregister_hw); 1111 1112void ieee80211_free_hw(struct ieee80211_hw *hw) 1113{ 1114 struct ieee80211_local *local = hw_to_local(hw); 1115 1116 mutex_destroy(&local->iflist_mtx); 1117 mutex_destroy(&local->scan_mtx); 1118 1119 wiphy_free(local->hw.wiphy); 1120} 1121EXPORT_SYMBOL(ieee80211_free_hw); 1122 1123static int __init ieee80211_init(void) 1124{ 1125 struct sk_buff *skb; 1126 int ret; 1127 1128 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1129 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1130 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1131 1132 ret = rc80211_minstrel_init(); 1133 if (ret) 1134 return ret; 1135 1136 ret = rc80211_pid_init(); 1137 if (ret) 1138 return ret; 1139 1140 ieee80211_debugfs_netdev_init(); 1141 1142 return 0; 1143} 1144 1145static void __exit ieee80211_exit(void) 1146{ 1147 rc80211_pid_exit(); 1148 rc80211_minstrel_exit(); 1149 1150 /* 1151 * For key todo, it'll be empty by now but the work 1152 * might still be scheduled. 1153 */ 1154 flush_scheduled_work(); 1155 1156 if (mesh_allocated) 1157 ieee80211s_stop(); 1158 1159 ieee80211_debugfs_netdev_exit(); 1160} 1161 1162 1163subsys_initcall(ieee80211_init); 1164module_exit(ieee80211_exit); 1165 1166MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1167MODULE_LICENSE("GPL"); 1168