main.c revision 7fee5372d814c4be9546e5c28ac0058258d8df3e
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 */ 42struct 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 */ 52void 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 95static 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 101static 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 109static 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 132static 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 146static 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 156int 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)); 171 172 if (sdata->vif.type == NL80211_IFTYPE_STATION || 173 sdata->vif.type == NL80211_IFTYPE_ADHOC) 174 conf.bssid = sdata->u.sta.bssid; 175 else if (sdata->vif.type == NL80211_IFTYPE_AP) 176 conf.bssid = sdata->dev->dev_addr; 177 else if (ieee80211_vif_is_mesh(&sdata->vif)) { 178 static const u8 zero[ETH_ALEN] = { 0 }; 179 conf.bssid = zero; 180 } else { 181 WARN_ON(1); 182 return -EINVAL; 183 } 184 185 switch (sdata->vif.type) { 186 case NL80211_IFTYPE_AP: 187 case NL80211_IFTYPE_ADHOC: 188 case NL80211_IFTYPE_MESH_POINT: 189 break; 190 default: 191 /* do not warn to simplify caller in scan.c */ 192 changed &= ~IEEE80211_IFCC_BEACON_ENABLED; 193 if (WARN_ON(changed & IEEE80211_IFCC_BEACON)) 194 return -EINVAL; 195 changed &= ~IEEE80211_IFCC_BEACON; 196 break; 197 } 198 199 if (changed & IEEE80211_IFCC_BEACON_ENABLED) { 200 if (local->sw_scanning) { 201 conf.enable_beacon = false; 202 } else { 203 /* 204 * Beacon should be enabled, but AP mode must 205 * check whether there is a beacon configured. 206 */ 207 switch (sdata->vif.type) { 208 case NL80211_IFTYPE_AP: 209 conf.enable_beacon = 210 !!rcu_dereference(sdata->u.ap.beacon); 211 break; 212 case NL80211_IFTYPE_ADHOC: 213 case NL80211_IFTYPE_MESH_POINT: 214 conf.enable_beacon = true; 215 break; 216 default: 217 /* not reached */ 218 WARN_ON(1); 219 break; 220 } 221 } 222 } 223 224 if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID))) 225 return -EINVAL; 226 227 conf.changed = changed; 228 229 return local->ops->config_interface(local_to_hw(local), 230 &sdata->vif, &conf); 231} 232 233int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 234{ 235 struct ieee80211_channel *chan; 236 int ret = 0; 237 int power; 238 enum nl80211_channel_type channel_type; 239 240 might_sleep(); 241 242 if (local->sw_scanning) { 243 chan = local->scan_channel; 244 channel_type = NL80211_CHAN_NO_HT; 245 } else { 246 chan = local->oper_channel; 247 channel_type = local->oper_channel_type; 248 } 249 250 if (chan != local->hw.conf.channel || 251 channel_type != local->hw.conf.channel_type) { 252 local->hw.conf.channel = chan; 253 local->hw.conf.channel_type = channel_type; 254 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 255 } 256 257 if (local->sw_scanning) 258 power = chan->max_power; 259 else 260 power = local->power_constr_level ? 261 (chan->max_power - local->power_constr_level) : 262 chan->max_power; 263 264 if (local->user_power_level) 265 power = min(power, local->user_power_level); 266 267 if (local->hw.conf.power_level != power) { 268 changed |= IEEE80211_CONF_CHANGE_POWER; 269 local->hw.conf.power_level = power; 270 } 271 272 if (changed && local->open_count) { 273 ret = local->ops->config(local_to_hw(local), changed); 274 /* 275 * Goal: 276 * HW reconfiguration should never fail, the driver has told 277 * us what it can support so it should live up to that promise. 278 * 279 * Current status: 280 * rfkill is not integrated with mac80211 and a 281 * configuration command can thus fail if hardware rfkill 282 * is enabled 283 * 284 * FIXME: integrate rfkill with mac80211 and then add this 285 * WARN_ON() back 286 * 287 */ 288 /* WARN_ON(ret); */ 289 } 290 291 return ret; 292} 293 294void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 295 u32 changed) 296{ 297 struct ieee80211_local *local = sdata->local; 298 299 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 300 return; 301 302 if (!changed) 303 return; 304 305 if (local->ops->bss_info_changed) 306 local->ops->bss_info_changed(local_to_hw(local), 307 &sdata->vif, 308 &sdata->vif.bss_conf, 309 changed); 310} 311 312u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 313{ 314 sdata->vif.bss_conf.use_cts_prot = false; 315 sdata->vif.bss_conf.use_short_preamble = false; 316 sdata->vif.bss_conf.use_short_slot = false; 317 return BSS_CHANGED_ERP_CTS_PROT | 318 BSS_CHANGED_ERP_PREAMBLE | 319 BSS_CHANGED_ERP_SLOT; 320} 321 322void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, 323 struct sk_buff *skb) 324{ 325 struct ieee80211_local *local = hw_to_local(hw); 326 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 327 int tmp; 328 329 skb->dev = local->mdev; 330 skb->pkt_type = IEEE80211_TX_STATUS_MSG; 331 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ? 332 &local->skb_queue : &local->skb_queue_unreliable, skb); 333 tmp = skb_queue_len(&local->skb_queue) + 334 skb_queue_len(&local->skb_queue_unreliable); 335 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && 336 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 337 dev_kfree_skb_irq(skb); 338 tmp--; 339 I802_DEBUG_INC(local->tx_status_drop); 340 } 341 tasklet_schedule(&local->tasklet); 342} 343EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); 344 345static void ieee80211_tasklet_handler(unsigned long data) 346{ 347 struct ieee80211_local *local = (struct ieee80211_local *) data; 348 struct sk_buff *skb; 349 struct ieee80211_rx_status rx_status; 350 struct ieee80211_ra_tid *ra_tid; 351 352 while ((skb = skb_dequeue(&local->skb_queue)) || 353 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 354 switch (skb->pkt_type) { 355 case IEEE80211_RX_MSG: 356 /* status is in skb->cb */ 357 memcpy(&rx_status, skb->cb, sizeof(rx_status)); 358 /* Clear skb->pkt_type in order to not confuse kernel 359 * netstack. */ 360 skb->pkt_type = 0; 361 __ieee80211_rx(local_to_hw(local), skb, &rx_status); 362 break; 363 case IEEE80211_TX_STATUS_MSG: 364 skb->pkt_type = 0; 365 ieee80211_tx_status(local_to_hw(local), skb); 366 break; 367 case IEEE80211_DELBA_MSG: 368 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 369 ieee80211_stop_tx_ba_cb(local_to_hw(local), 370 ra_tid->ra, ra_tid->tid); 371 dev_kfree_skb(skb); 372 break; 373 case IEEE80211_ADDBA_MSG: 374 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 375 ieee80211_start_tx_ba_cb(local_to_hw(local), 376 ra_tid->ra, ra_tid->tid); 377 dev_kfree_skb(skb); 378 break ; 379 default: 380 WARN(1, "mac80211: Packet is of unknown type %d\n", 381 skb->pkt_type); 382 dev_kfree_skb(skb); 383 break; 384 } 385 } 386} 387 388/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to 389 * make a prepared TX frame (one that has been given to hw) to look like brand 390 * new IEEE 802.11 frame that is ready to go through TX processing again. 391 */ 392static void ieee80211_remove_tx_extra(struct ieee80211_local *local, 393 struct ieee80211_key *key, 394 struct sk_buff *skb) 395{ 396 unsigned int hdrlen, iv_len, mic_len; 397 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 398 399 hdrlen = ieee80211_hdrlen(hdr->frame_control); 400 401 if (!key) 402 goto no_key; 403 404 switch (key->conf.alg) { 405 case ALG_WEP: 406 iv_len = WEP_IV_LEN; 407 mic_len = WEP_ICV_LEN; 408 break; 409 case ALG_TKIP: 410 iv_len = TKIP_IV_LEN; 411 mic_len = TKIP_ICV_LEN; 412 break; 413 case ALG_CCMP: 414 iv_len = CCMP_HDR_LEN; 415 mic_len = CCMP_MIC_LEN; 416 break; 417 default: 418 goto no_key; 419 } 420 421 if (skb->len >= hdrlen + mic_len && 422 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 423 skb_trim(skb, skb->len - mic_len); 424 if (skb->len >= hdrlen + iv_len) { 425 memmove(skb->data + iv_len, skb->data, hdrlen); 426 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len); 427 } 428 429no_key: 430 if (ieee80211_is_data_qos(hdr->frame_control)) { 431 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 432 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data, 433 hdrlen - IEEE80211_QOS_CTL_LEN); 434 skb_pull(skb, IEEE80211_QOS_CTL_LEN); 435 } 436} 437 438static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, 439 struct sta_info *sta, 440 struct sk_buff *skb) 441{ 442 sta->tx_filtered_count++; 443 444 /* 445 * Clear the TX filter mask for this STA when sending the next 446 * packet. If the STA went to power save mode, this will happen 447 * when it wakes up for the next time. 448 */ 449 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT); 450 451 /* 452 * This code races in the following way: 453 * 454 * (1) STA sends frame indicating it will go to sleep and does so 455 * (2) hardware/firmware adds STA to filter list, passes frame up 456 * (3) hardware/firmware processes TX fifo and suppresses a frame 457 * (4) we get TX status before having processed the frame and 458 * knowing that the STA has gone to sleep. 459 * 460 * This is actually quite unlikely even when both those events are 461 * processed from interrupts coming in quickly after one another or 462 * even at the same time because we queue both TX status events and 463 * RX frames to be processed by a tasklet and process them in the 464 * same order that they were received or TX status last. Hence, there 465 * is no race as long as the frame RX is processed before the next TX 466 * status, which drivers can ensure, see below. 467 * 468 * Note that this can only happen if the hardware or firmware can 469 * actually add STAs to the filter list, if this is done by the 470 * driver in response to set_tim() (which will only reduce the race 471 * this whole filtering tries to solve, not completely solve it) 472 * this situation cannot happen. 473 * 474 * To completely solve this race drivers need to make sure that they 475 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 476 * functions and 477 * (b) always process RX events before TX status events if ordering 478 * can be unknown, for example with different interrupt status 479 * bits. 480 */ 481 if (test_sta_flags(sta, WLAN_STA_PS) && 482 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) { 483 ieee80211_remove_tx_extra(local, sta->key, skb); 484 skb_queue_tail(&sta->tx_filtered, skb); 485 return; 486 } 487 488 if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) { 489 /* Software retry the packet once */ 490 skb->requeue = 1; 491 ieee80211_remove_tx_extra(local, sta->key, skb); 492 dev_queue_xmit(skb); 493 return; 494 } 495 496#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 497 if (net_ratelimit()) 498 printk(KERN_DEBUG "%s: dropped TX filtered frame, " 499 "queue_len=%d PS=%d @%lu\n", 500 wiphy_name(local->hw.wiphy), 501 skb_queue_len(&sta->tx_filtered), 502 !!test_sta_flags(sta, WLAN_STA_PS), jiffies); 503#endif 504 dev_kfree_skb(skb); 505} 506 507void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 508{ 509 struct sk_buff *skb2; 510 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 511 struct ieee80211_local *local = hw_to_local(hw); 512 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 513 u16 frag, type; 514 __le16 fc; 515 struct ieee80211_supported_band *sband; 516 struct ieee80211_tx_status_rtap_hdr *rthdr; 517 struct ieee80211_sub_if_data *sdata; 518 struct net_device *prev_dev = NULL; 519 struct sta_info *sta; 520 int retry_count = -1, i; 521 522 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 523 /* the HW cannot have attempted that rate */ 524 if (i >= hw->max_rates) { 525 info->status.rates[i].idx = -1; 526 info->status.rates[i].count = 0; 527 } 528 529 retry_count += info->status.rates[i].count; 530 } 531 if (retry_count < 0) 532 retry_count = 0; 533 534 rcu_read_lock(); 535 536 sband = local->hw.wiphy->bands[info->band]; 537 538 sta = sta_info_get(local, hdr->addr1); 539 540 if (sta) { 541 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 542 test_sta_flags(sta, WLAN_STA_PS)) { 543 /* 544 * The STA is in power save mode, so assume 545 * that this TX packet failed because of that. 546 */ 547 ieee80211_handle_filtered_frame(local, sta, skb); 548 rcu_read_unlock(); 549 return; 550 } 551 552 fc = hdr->frame_control; 553 554 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 555 (ieee80211_is_data_qos(fc))) { 556 u16 tid, ssn; 557 u8 *qc; 558 559 qc = ieee80211_get_qos_ctl(hdr); 560 tid = qc[0] & 0xf; 561 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 562 & IEEE80211_SCTL_SEQ); 563 ieee80211_send_bar(sta->sdata, hdr->addr1, 564 tid, ssn); 565 } 566 567 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 568 ieee80211_handle_filtered_frame(local, sta, skb); 569 rcu_read_unlock(); 570 return; 571 } else { 572 if (!(info->flags & IEEE80211_TX_STAT_ACK)) 573 sta->tx_retry_failed++; 574 sta->tx_retry_count += retry_count; 575 } 576 577 rate_control_tx_status(local, sband, sta, skb); 578 } 579 580 rcu_read_unlock(); 581 582 ieee80211_led_tx(local, 0); 583 584 /* SNMP counters 585 * Fragments are passed to low-level drivers as separate skbs, so these 586 * are actually fragments, not frames. Update frame counters only for 587 * the first fragment of the frame. */ 588 589 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG; 590 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE; 591 592 if (info->flags & IEEE80211_TX_STAT_ACK) { 593 if (frag == 0) { 594 local->dot11TransmittedFrameCount++; 595 if (is_multicast_ether_addr(hdr->addr1)) 596 local->dot11MulticastTransmittedFrameCount++; 597 if (retry_count > 0) 598 local->dot11RetryCount++; 599 if (retry_count > 1) 600 local->dot11MultipleRetryCount++; 601 } 602 603 /* This counter shall be incremented for an acknowledged MPDU 604 * with an individual address in the address 1 field or an MPDU 605 * with a multicast address in the address 1 field of type Data 606 * or Management. */ 607 if (!is_multicast_ether_addr(hdr->addr1) || 608 type == IEEE80211_FTYPE_DATA || 609 type == IEEE80211_FTYPE_MGMT) 610 local->dot11TransmittedFragmentCount++; 611 } else { 612 if (frag == 0) 613 local->dot11FailedCount++; 614 } 615 616 /* this was a transmitted frame, but now we want to reuse it */ 617 skb_orphan(skb); 618 619 /* 620 * This is a bit racy but we can avoid a lot of work 621 * with this test... 622 */ 623 if (!local->monitors && !local->cooked_mntrs) { 624 dev_kfree_skb(skb); 625 return; 626 } 627 628 /* send frame to monitor interfaces now */ 629 630 if (skb_headroom(skb) < sizeof(*rthdr)) { 631 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n"); 632 dev_kfree_skb(skb); 633 return; 634 } 635 636 rthdr = (struct ieee80211_tx_status_rtap_hdr *) 637 skb_push(skb, sizeof(*rthdr)); 638 639 memset(rthdr, 0, sizeof(*rthdr)); 640 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); 641 rthdr->hdr.it_present = 642 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 643 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) | 644 (1 << IEEE80211_RADIOTAP_RATE)); 645 646 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 647 !is_multicast_ether_addr(hdr->addr1)) 648 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL); 649 650 /* 651 * XXX: Once radiotap gets the bitmap reset thing the vendor 652 * extensions proposal contains, we can actually report 653 * the whole set of tries we did. 654 */ 655 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || 656 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) 657 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS); 658 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 659 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS); 660 if (info->status.rates[0].idx >= 0 && 661 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) 662 rthdr->rate = sband->bitrates[ 663 info->status.rates[0].idx].bitrate / 5; 664 665 /* for now report the total retry_count */ 666 rthdr->data_retries = retry_count; 667 668 /* XXX: is this sufficient for BPF? */ 669 skb_set_mac_header(skb, 0); 670 skb->ip_summed = CHECKSUM_UNNECESSARY; 671 skb->pkt_type = PACKET_OTHERHOST; 672 skb->protocol = htons(ETH_P_802_2); 673 memset(skb->cb, 0, sizeof(skb->cb)); 674 675 rcu_read_lock(); 676 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 677 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 678 if (!netif_running(sdata->dev)) 679 continue; 680 681 if (prev_dev) { 682 skb2 = skb_clone(skb, GFP_ATOMIC); 683 if (skb2) { 684 skb2->dev = prev_dev; 685 netif_rx(skb2); 686 } 687 } 688 689 prev_dev = sdata->dev; 690 } 691 } 692 if (prev_dev) { 693 skb->dev = prev_dev; 694 netif_rx(skb); 695 skb = NULL; 696 } 697 rcu_read_unlock(); 698 dev_kfree_skb(skb); 699} 700EXPORT_SYMBOL(ieee80211_tx_status); 701 702struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 703 const struct ieee80211_ops *ops) 704{ 705 struct ieee80211_local *local; 706 int priv_size; 707 struct wiphy *wiphy; 708 709 /* Ensure 32-byte alignment of our private data and hw private data. 710 * We use the wiphy priv data for both our ieee80211_local and for 711 * the driver's private data 712 * 713 * In memory it'll be like this: 714 * 715 * +-------------------------+ 716 * | struct wiphy | 717 * +-------------------------+ 718 * | struct ieee80211_local | 719 * +-------------------------+ 720 * | driver's private data | 721 * +-------------------------+ 722 * 723 */ 724 priv_size = ((sizeof(struct ieee80211_local) + 725 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) + 726 priv_data_len; 727 728 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 729 730 if (!wiphy) 731 return NULL; 732 733 wiphy->privid = mac80211_wiphy_privid; 734 735 local = wiphy_priv(wiphy); 736 local->hw.wiphy = wiphy; 737 738 local->hw.priv = (char *)local + 739 ((sizeof(struct ieee80211_local) + 740 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST); 741 742 BUG_ON(!ops->tx); 743 BUG_ON(!ops->start); 744 BUG_ON(!ops->stop); 745 BUG_ON(!ops->config); 746 BUG_ON(!ops->add_interface); 747 BUG_ON(!ops->remove_interface); 748 BUG_ON(!ops->configure_filter); 749 local->ops = ops; 750 751 /* set up some defaults */ 752 local->hw.queues = 1; 753 local->hw.max_rates = 1; 754 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD; 755 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD; 756 local->hw.conf.long_frame_max_tx_count = 4; 757 local->hw.conf.short_frame_max_tx_count = 7; 758 local->hw.conf.radio_enabled = true; 759 760 INIT_LIST_HEAD(&local->interfaces); 761 mutex_init(&local->iflist_mtx); 762 763 spin_lock_init(&local->key_lock); 764 765 spin_lock_init(&local->queue_stop_reason_lock); 766 767 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 768 769 INIT_WORK(&local->dynamic_ps_enable_work, 770 ieee80211_dynamic_ps_enable_work); 771 INIT_WORK(&local->dynamic_ps_disable_work, 772 ieee80211_dynamic_ps_disable_work); 773 setup_timer(&local->dynamic_ps_timer, 774 ieee80211_dynamic_ps_timer, (unsigned long) local); 775 776 sta_info_init(local); 777 778 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 779 (unsigned long)local); 780 tasklet_disable(&local->tx_pending_tasklet); 781 782 tasklet_init(&local->tasklet, 783 ieee80211_tasklet_handler, 784 (unsigned long) local); 785 tasklet_disable(&local->tasklet); 786 787 skb_queue_head_init(&local->skb_queue); 788 skb_queue_head_init(&local->skb_queue_unreliable); 789 790 return local_to_hw(local); 791} 792EXPORT_SYMBOL(ieee80211_alloc_hw); 793 794int ieee80211_register_hw(struct ieee80211_hw *hw) 795{ 796 struct ieee80211_local *local = hw_to_local(hw); 797 int result; 798 enum ieee80211_band band; 799 struct net_device *mdev; 800 struct ieee80211_master_priv *mpriv; 801 802 /* 803 * generic code guarantees at least one band, 804 * set this very early because much code assumes 805 * that hw.conf.channel is assigned 806 */ 807 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 808 struct ieee80211_supported_band *sband; 809 810 sband = local->hw.wiphy->bands[band]; 811 if (sband) { 812 /* init channel we're on */ 813 local->hw.conf.channel = 814 local->oper_channel = 815 local->scan_channel = &sband->channels[0]; 816 break; 817 } 818 } 819 820 /* if low-level driver supports AP, we also support VLAN */ 821 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) 822 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 823 824 /* mac80211 always supports monitor */ 825 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 826 827 result = wiphy_register(local->hw.wiphy); 828 if (result < 0) 829 return result; 830 831 /* 832 * We use the number of queues for feature tests (QoS, HT) internally 833 * so restrict them appropriately. 834 */ 835 if (hw->queues > IEEE80211_MAX_QUEUES) 836 hw->queues = IEEE80211_MAX_QUEUES; 837 if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES) 838 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES; 839 if (hw->queues < 4) 840 hw->ampdu_queues = 0; 841 842 mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv), 843 "wmaster%d", ether_setup, 844 ieee80211_num_queues(hw)); 845 if (!mdev) 846 goto fail_mdev_alloc; 847 848 mpriv = netdev_priv(mdev); 849 mpriv->local = local; 850 local->mdev = mdev; 851 852 ieee80211_rx_bss_list_init(local); 853 854 mdev->hard_start_xmit = ieee80211_master_start_xmit; 855 mdev->open = ieee80211_master_open; 856 mdev->stop = ieee80211_master_stop; 857 mdev->type = ARPHRD_IEEE80211; 858 mdev->header_ops = &ieee80211_header_ops; 859 mdev->set_multicast_list = ieee80211_master_set_multicast_list; 860 861 local->hw.workqueue = 862 create_singlethread_workqueue(wiphy_name(local->hw.wiphy)); 863 if (!local->hw.workqueue) { 864 result = -ENOMEM; 865 goto fail_workqueue; 866 } 867 868 /* 869 * The hardware needs headroom for sending the frame, 870 * and we need some headroom for passing the frame to monitor 871 * interfaces, but never both at the same time. 872 */ 873 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 874 sizeof(struct ieee80211_tx_status_rtap_hdr)); 875 876 debugfs_hw_add(local); 877 878 if (local->hw.conf.beacon_int < 10) 879 local->hw.conf.beacon_int = 100; 880 881 if (local->hw.max_listen_interval == 0) 882 local->hw.max_listen_interval = 1; 883 884 local->hw.conf.listen_interval = local->hw.max_listen_interval; 885 886 local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC | 887 IEEE80211_HW_SIGNAL_DBM) ? 888 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID; 889 local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ? 890 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID; 891 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 892 local->wstats_flags |= IW_QUAL_DBM; 893 894 result = sta_info_start(local); 895 if (result < 0) 896 goto fail_sta_info; 897 898 rtnl_lock(); 899 result = dev_alloc_name(local->mdev, local->mdev->name); 900 if (result < 0) 901 goto fail_dev; 902 903 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 904 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy)); 905 906 result = register_netdevice(local->mdev); 907 if (result < 0) 908 goto fail_dev; 909 910 result = ieee80211_init_rate_ctrl_alg(local, 911 hw->rate_control_algorithm); 912 if (result < 0) { 913 printk(KERN_DEBUG "%s: Failed to initialize rate control " 914 "algorithm\n", wiphy_name(local->hw.wiphy)); 915 goto fail_rate; 916 } 917 918 result = ieee80211_wep_init(local); 919 920 if (result < 0) { 921 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n", 922 wiphy_name(local->hw.wiphy), result); 923 goto fail_wep; 924 } 925 926 local->mdev->select_queue = ieee80211_select_queue; 927 928 /* add one default STA interface if supported */ 929 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 930 result = ieee80211_if_add(local, "wlan%d", NULL, 931 NL80211_IFTYPE_STATION, NULL); 932 if (result) 933 printk(KERN_WARNING "%s: Failed to add default virtual iface\n", 934 wiphy_name(local->hw.wiphy)); 935 } 936 937 rtnl_unlock(); 938 939 ieee80211_led_init(local); 940 941 return 0; 942 943fail_wep: 944 rate_control_deinitialize(local); 945fail_rate: 946 unregister_netdevice(local->mdev); 947 local->mdev = NULL; 948fail_dev: 949 rtnl_unlock(); 950 sta_info_stop(local); 951fail_sta_info: 952 debugfs_hw_del(local); 953 destroy_workqueue(local->hw.workqueue); 954fail_workqueue: 955 if (local->mdev) 956 free_netdev(local->mdev); 957fail_mdev_alloc: 958 wiphy_unregister(local->hw.wiphy); 959 return result; 960} 961EXPORT_SYMBOL(ieee80211_register_hw); 962 963void ieee80211_unregister_hw(struct ieee80211_hw *hw) 964{ 965 struct ieee80211_local *local = hw_to_local(hw); 966 967 tasklet_kill(&local->tx_pending_tasklet); 968 tasklet_kill(&local->tasklet); 969 970 rtnl_lock(); 971 972 /* 973 * At this point, interface list manipulations are fine 974 * because the driver cannot be handing us frames any 975 * more and the tasklet is killed. 976 */ 977 978 /* First, we remove all virtual interfaces. */ 979 ieee80211_remove_interfaces(local); 980 981 /* then, finally, remove the master interface */ 982 unregister_netdevice(local->mdev); 983 984 rtnl_unlock(); 985 986 ieee80211_rx_bss_list_deinit(local); 987 ieee80211_clear_tx_pending(local); 988 sta_info_stop(local); 989 rate_control_deinitialize(local); 990 debugfs_hw_del(local); 991 992 if (skb_queue_len(&local->skb_queue) 993 || skb_queue_len(&local->skb_queue_unreliable)) 994 printk(KERN_WARNING "%s: skb_queue not empty\n", 995 wiphy_name(local->hw.wiphy)); 996 skb_queue_purge(&local->skb_queue); 997 skb_queue_purge(&local->skb_queue_unreliable); 998 999 destroy_workqueue(local->hw.workqueue); 1000 wiphy_unregister(local->hw.wiphy); 1001 ieee80211_wep_free(local); 1002 ieee80211_led_exit(local); 1003 free_netdev(local->mdev); 1004} 1005EXPORT_SYMBOL(ieee80211_unregister_hw); 1006 1007void ieee80211_free_hw(struct ieee80211_hw *hw) 1008{ 1009 struct ieee80211_local *local = hw_to_local(hw); 1010 1011 mutex_destroy(&local->iflist_mtx); 1012 1013 wiphy_free(local->hw.wiphy); 1014} 1015EXPORT_SYMBOL(ieee80211_free_hw); 1016 1017static int __init ieee80211_init(void) 1018{ 1019 struct sk_buff *skb; 1020 int ret; 1021 1022 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1023 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1024 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1025 1026 ret = rc80211_minstrel_init(); 1027 if (ret) 1028 return ret; 1029 1030 ret = rc80211_pid_init(); 1031 if (ret) 1032 return ret; 1033 1034 ieee80211_debugfs_netdev_init(); 1035 1036 return 0; 1037} 1038 1039static void __exit ieee80211_exit(void) 1040{ 1041 rc80211_pid_exit(); 1042 rc80211_minstrel_exit(); 1043 1044 /* 1045 * For key todo, it'll be empty by now but the work 1046 * might still be scheduled. 1047 */ 1048 flush_scheduled_work(); 1049 1050 if (mesh_allocated) 1051 ieee80211s_stop(); 1052 1053 ieee80211_debugfs_netdev_exit(); 1054} 1055 1056 1057subsys_initcall(ieee80211_init); 1058module_exit(ieee80211_exit); 1059 1060MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1061MODULE_LICENSE("GPL"); 1062