main.c revision 9a03d6d7a8698f26f8ef02dd3c91f8f68c4edcc7
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 conf.enable_beacon = !!sdata->u.sta.probe_resp; 214 break; 215 case NL80211_IFTYPE_MESH_POINT: 216 conf.enable_beacon = true; 217 break; 218 default: 219 /* not reached */ 220 WARN_ON(1); 221 break; 222 } 223 } 224 } 225 226 if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID))) 227 return -EINVAL; 228 229 conf.changed = changed; 230 231 return local->ops->config_interface(local_to_hw(local), 232 &sdata->vif, &conf); 233} 234 235int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 236{ 237 struct ieee80211_channel *chan; 238 int ret = 0; 239 int power; 240 enum nl80211_channel_type channel_type; 241 242 might_sleep(); 243 244 if (local->sw_scanning) { 245 chan = local->scan_channel; 246 channel_type = NL80211_CHAN_NO_HT; 247 } else { 248 chan = local->oper_channel; 249 channel_type = local->oper_channel_type; 250 } 251 252 if (chan != local->hw.conf.channel || 253 channel_type != local->hw.conf.channel_type) { 254 local->hw.conf.channel = chan; 255 local->hw.conf.channel_type = channel_type; 256 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 257 } 258 259 if (local->sw_scanning) 260 power = chan->max_power; 261 else 262 power = local->power_constr_level ? 263 (chan->max_power - local->power_constr_level) : 264 chan->max_power; 265 266 if (local->user_power_level) 267 power = min(power, local->user_power_level); 268 269 if (local->hw.conf.power_level != power) { 270 changed |= IEEE80211_CONF_CHANGE_POWER; 271 local->hw.conf.power_level = power; 272 } 273 274 if (changed && local->open_count) { 275 ret = local->ops->config(local_to_hw(local), changed); 276 /* 277 * Goal: 278 * HW reconfiguration should never fail, the driver has told 279 * us what it can support so it should live up to that promise. 280 * 281 * Current status: 282 * rfkill is not integrated with mac80211 and a 283 * configuration command can thus fail if hardware rfkill 284 * is enabled 285 * 286 * FIXME: integrate rfkill with mac80211 and then add this 287 * WARN_ON() back 288 * 289 */ 290 /* WARN_ON(ret); */ 291 } 292 293 return ret; 294} 295 296void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 297 u32 changed) 298{ 299 struct ieee80211_local *local = sdata->local; 300 301 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 302 return; 303 304 if (!changed) 305 return; 306 307 if (local->ops->bss_info_changed) 308 local->ops->bss_info_changed(local_to_hw(local), 309 &sdata->vif, 310 &sdata->vif.bss_conf, 311 changed); 312} 313 314u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 315{ 316 sdata->vif.bss_conf.use_cts_prot = false; 317 sdata->vif.bss_conf.use_short_preamble = false; 318 sdata->vif.bss_conf.use_short_slot = false; 319 return BSS_CHANGED_ERP_CTS_PROT | 320 BSS_CHANGED_ERP_PREAMBLE | 321 BSS_CHANGED_ERP_SLOT; 322} 323 324void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, 325 struct sk_buff *skb) 326{ 327 struct ieee80211_local *local = hw_to_local(hw); 328 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 329 int tmp; 330 331 skb->dev = local->mdev; 332 skb->pkt_type = IEEE80211_TX_STATUS_MSG; 333 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ? 334 &local->skb_queue : &local->skb_queue_unreliable, skb); 335 tmp = skb_queue_len(&local->skb_queue) + 336 skb_queue_len(&local->skb_queue_unreliable); 337 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && 338 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 339 dev_kfree_skb_irq(skb); 340 tmp--; 341 I802_DEBUG_INC(local->tx_status_drop); 342 } 343 tasklet_schedule(&local->tasklet); 344} 345EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); 346 347static void ieee80211_tasklet_handler(unsigned long data) 348{ 349 struct ieee80211_local *local = (struct ieee80211_local *) data; 350 struct sk_buff *skb; 351 struct ieee80211_rx_status rx_status; 352 struct ieee80211_ra_tid *ra_tid; 353 354 while ((skb = skb_dequeue(&local->skb_queue)) || 355 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 356 switch (skb->pkt_type) { 357 case IEEE80211_RX_MSG: 358 /* status is in skb->cb */ 359 memcpy(&rx_status, skb->cb, sizeof(rx_status)); 360 /* Clear skb->pkt_type in order to not confuse kernel 361 * netstack. */ 362 skb->pkt_type = 0; 363 __ieee80211_rx(local_to_hw(local), skb, &rx_status); 364 break; 365 case IEEE80211_TX_STATUS_MSG: 366 skb->pkt_type = 0; 367 ieee80211_tx_status(local_to_hw(local), skb); 368 break; 369 case IEEE80211_DELBA_MSG: 370 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 371 ieee80211_stop_tx_ba_cb(local_to_hw(local), 372 ra_tid->ra, ra_tid->tid); 373 dev_kfree_skb(skb); 374 break; 375 case IEEE80211_ADDBA_MSG: 376 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 377 ieee80211_start_tx_ba_cb(local_to_hw(local), 378 ra_tid->ra, ra_tid->tid); 379 dev_kfree_skb(skb); 380 break ; 381 default: 382 WARN(1, "mac80211: Packet is of unknown type %d\n", 383 skb->pkt_type); 384 dev_kfree_skb(skb); 385 break; 386 } 387 } 388} 389 390/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to 391 * make a prepared TX frame (one that has been given to hw) to look like brand 392 * new IEEE 802.11 frame that is ready to go through TX processing again. 393 */ 394static void ieee80211_remove_tx_extra(struct ieee80211_local *local, 395 struct ieee80211_key *key, 396 struct sk_buff *skb) 397{ 398 unsigned int hdrlen, iv_len, mic_len; 399 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 400 401 hdrlen = ieee80211_hdrlen(hdr->frame_control); 402 403 if (!key) 404 goto no_key; 405 406 switch (key->conf.alg) { 407 case ALG_WEP: 408 iv_len = WEP_IV_LEN; 409 mic_len = WEP_ICV_LEN; 410 break; 411 case ALG_TKIP: 412 iv_len = TKIP_IV_LEN; 413 mic_len = TKIP_ICV_LEN; 414 break; 415 case ALG_CCMP: 416 iv_len = CCMP_HDR_LEN; 417 mic_len = CCMP_MIC_LEN; 418 break; 419 default: 420 goto no_key; 421 } 422 423 if (skb->len >= hdrlen + mic_len && 424 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 425 skb_trim(skb, skb->len - mic_len); 426 if (skb->len >= hdrlen + iv_len) { 427 memmove(skb->data + iv_len, skb->data, hdrlen); 428 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len); 429 } 430 431no_key: 432 if (ieee80211_is_data_qos(hdr->frame_control)) { 433 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 434 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data, 435 hdrlen - IEEE80211_QOS_CTL_LEN); 436 skb_pull(skb, IEEE80211_QOS_CTL_LEN); 437 } 438} 439 440static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, 441 struct sta_info *sta, 442 struct sk_buff *skb) 443{ 444 sta->tx_filtered_count++; 445 446 /* 447 * Clear the TX filter mask for this STA when sending the next 448 * packet. If the STA went to power save mode, this will happen 449 * when it wakes up for the next time. 450 */ 451 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT); 452 453 /* 454 * This code races in the following way: 455 * 456 * (1) STA sends frame indicating it will go to sleep and does so 457 * (2) hardware/firmware adds STA to filter list, passes frame up 458 * (3) hardware/firmware processes TX fifo and suppresses a frame 459 * (4) we get TX status before having processed the frame and 460 * knowing that the STA has gone to sleep. 461 * 462 * This is actually quite unlikely even when both those events are 463 * processed from interrupts coming in quickly after one another or 464 * even at the same time because we queue both TX status events and 465 * RX frames to be processed by a tasklet and process them in the 466 * same order that they were received or TX status last. Hence, there 467 * is no race as long as the frame RX is processed before the next TX 468 * status, which drivers can ensure, see below. 469 * 470 * Note that this can only happen if the hardware or firmware can 471 * actually add STAs to the filter list, if this is done by the 472 * driver in response to set_tim() (which will only reduce the race 473 * this whole filtering tries to solve, not completely solve it) 474 * this situation cannot happen. 475 * 476 * To completely solve this race drivers need to make sure that they 477 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 478 * functions and 479 * (b) always process RX events before TX status events if ordering 480 * can be unknown, for example with different interrupt status 481 * bits. 482 */ 483 if (test_sta_flags(sta, WLAN_STA_PS) && 484 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) { 485 ieee80211_remove_tx_extra(local, sta->key, skb); 486 skb_queue_tail(&sta->tx_filtered, skb); 487 return; 488 } 489 490 if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) { 491 /* Software retry the packet once */ 492 skb->requeue = 1; 493 ieee80211_remove_tx_extra(local, sta->key, skb); 494 dev_queue_xmit(skb); 495 return; 496 } 497 498#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 499 if (net_ratelimit()) 500 printk(KERN_DEBUG "%s: dropped TX filtered frame, " 501 "queue_len=%d PS=%d @%lu\n", 502 wiphy_name(local->hw.wiphy), 503 skb_queue_len(&sta->tx_filtered), 504 !!test_sta_flags(sta, WLAN_STA_PS), jiffies); 505#endif 506 dev_kfree_skb(skb); 507} 508 509void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 510{ 511 struct sk_buff *skb2; 512 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 513 struct ieee80211_local *local = hw_to_local(hw); 514 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 515 u16 frag, type; 516 __le16 fc; 517 struct ieee80211_supported_band *sband; 518 struct ieee80211_tx_status_rtap_hdr *rthdr; 519 struct ieee80211_sub_if_data *sdata; 520 struct net_device *prev_dev = NULL; 521 struct sta_info *sta; 522 int retry_count = -1, i; 523 524 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 525 /* the HW cannot have attempted that rate */ 526 if (i >= hw->max_rates) { 527 info->status.rates[i].idx = -1; 528 info->status.rates[i].count = 0; 529 } 530 531 retry_count += info->status.rates[i].count; 532 } 533 if (retry_count < 0) 534 retry_count = 0; 535 536 rcu_read_lock(); 537 538 sband = local->hw.wiphy->bands[info->band]; 539 540 sta = sta_info_get(local, hdr->addr1); 541 542 if (sta) { 543 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 544 test_sta_flags(sta, WLAN_STA_PS)) { 545 /* 546 * The STA is in power save mode, so assume 547 * that this TX packet failed because of that. 548 */ 549 ieee80211_handle_filtered_frame(local, sta, skb); 550 rcu_read_unlock(); 551 return; 552 } 553 554 fc = hdr->frame_control; 555 556 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 557 (ieee80211_is_data_qos(fc))) { 558 u16 tid, ssn; 559 u8 *qc; 560 561 qc = ieee80211_get_qos_ctl(hdr); 562 tid = qc[0] & 0xf; 563 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 564 & IEEE80211_SCTL_SEQ); 565 ieee80211_send_bar(sta->sdata, hdr->addr1, 566 tid, ssn); 567 } 568 569 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 570 ieee80211_handle_filtered_frame(local, sta, skb); 571 rcu_read_unlock(); 572 return; 573 } else { 574 if (!(info->flags & IEEE80211_TX_STAT_ACK)) 575 sta->tx_retry_failed++; 576 sta->tx_retry_count += retry_count; 577 } 578 579 rate_control_tx_status(local, sband, sta, skb); 580 } 581 582 rcu_read_unlock(); 583 584 ieee80211_led_tx(local, 0); 585 586 /* SNMP counters 587 * Fragments are passed to low-level drivers as separate skbs, so these 588 * are actually fragments, not frames. Update frame counters only for 589 * the first fragment of the frame. */ 590 591 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG; 592 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE; 593 594 if (info->flags & IEEE80211_TX_STAT_ACK) { 595 if (frag == 0) { 596 local->dot11TransmittedFrameCount++; 597 if (is_multicast_ether_addr(hdr->addr1)) 598 local->dot11MulticastTransmittedFrameCount++; 599 if (retry_count > 0) 600 local->dot11RetryCount++; 601 if (retry_count > 1) 602 local->dot11MultipleRetryCount++; 603 } 604 605 /* This counter shall be incremented for an acknowledged MPDU 606 * with an individual address in the address 1 field or an MPDU 607 * with a multicast address in the address 1 field of type Data 608 * or Management. */ 609 if (!is_multicast_ether_addr(hdr->addr1) || 610 type == IEEE80211_FTYPE_DATA || 611 type == IEEE80211_FTYPE_MGMT) 612 local->dot11TransmittedFragmentCount++; 613 } else { 614 if (frag == 0) 615 local->dot11FailedCount++; 616 } 617 618 /* this was a transmitted frame, but now we want to reuse it */ 619 skb_orphan(skb); 620 621 /* 622 * This is a bit racy but we can avoid a lot of work 623 * with this test... 624 */ 625 if (!local->monitors && !local->cooked_mntrs) { 626 dev_kfree_skb(skb); 627 return; 628 } 629 630 /* send frame to monitor interfaces now */ 631 632 if (skb_headroom(skb) < sizeof(*rthdr)) { 633 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n"); 634 dev_kfree_skb(skb); 635 return; 636 } 637 638 rthdr = (struct ieee80211_tx_status_rtap_hdr *) 639 skb_push(skb, sizeof(*rthdr)); 640 641 memset(rthdr, 0, sizeof(*rthdr)); 642 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); 643 rthdr->hdr.it_present = 644 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 645 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) | 646 (1 << IEEE80211_RADIOTAP_RATE)); 647 648 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 649 !is_multicast_ether_addr(hdr->addr1)) 650 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL); 651 652 /* 653 * XXX: Once radiotap gets the bitmap reset thing the vendor 654 * extensions proposal contains, we can actually report 655 * the whole set of tries we did. 656 */ 657 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || 658 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) 659 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS); 660 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 661 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS); 662 if (info->status.rates[0].idx >= 0 && 663 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) 664 rthdr->rate = sband->bitrates[ 665 info->status.rates[0].idx].bitrate / 5; 666 667 /* for now report the total retry_count */ 668 rthdr->data_retries = retry_count; 669 670 /* XXX: is this sufficient for BPF? */ 671 skb_set_mac_header(skb, 0); 672 skb->ip_summed = CHECKSUM_UNNECESSARY; 673 skb->pkt_type = PACKET_OTHERHOST; 674 skb->protocol = htons(ETH_P_802_2); 675 memset(skb->cb, 0, sizeof(skb->cb)); 676 677 rcu_read_lock(); 678 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 679 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 680 if (!netif_running(sdata->dev)) 681 continue; 682 683 if (prev_dev) { 684 skb2 = skb_clone(skb, GFP_ATOMIC); 685 if (skb2) { 686 skb2->dev = prev_dev; 687 netif_rx(skb2); 688 } 689 } 690 691 prev_dev = sdata->dev; 692 } 693 } 694 if (prev_dev) { 695 skb->dev = prev_dev; 696 netif_rx(skb); 697 skb = NULL; 698 } 699 rcu_read_unlock(); 700 dev_kfree_skb(skb); 701} 702EXPORT_SYMBOL(ieee80211_tx_status); 703 704struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 705 const struct ieee80211_ops *ops) 706{ 707 struct ieee80211_local *local; 708 int priv_size; 709 struct wiphy *wiphy; 710 711 /* Ensure 32-byte alignment of our private data and hw private data. 712 * We use the wiphy priv data for both our ieee80211_local and for 713 * the driver's private data 714 * 715 * In memory it'll be like this: 716 * 717 * +-------------------------+ 718 * | struct wiphy | 719 * +-------------------------+ 720 * | struct ieee80211_local | 721 * +-------------------------+ 722 * | driver's private data | 723 * +-------------------------+ 724 * 725 */ 726 priv_size = ((sizeof(struct ieee80211_local) + 727 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) + 728 priv_data_len; 729 730 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 731 732 if (!wiphy) 733 return NULL; 734 735 wiphy->privid = mac80211_wiphy_privid; 736 wiphy->max_scan_ssids = 4; 737 /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */ 738 wiphy->bss_priv_size = sizeof(struct ieee80211_bss) - 739 sizeof(struct cfg80211_bss); 740 741 local = wiphy_priv(wiphy); 742 local->hw.wiphy = wiphy; 743 744 local->hw.priv = (char *)local + 745 ((sizeof(struct ieee80211_local) + 746 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST); 747 748 BUG_ON(!ops->tx); 749 BUG_ON(!ops->start); 750 BUG_ON(!ops->stop); 751 BUG_ON(!ops->config); 752 BUG_ON(!ops->add_interface); 753 BUG_ON(!ops->remove_interface); 754 BUG_ON(!ops->configure_filter); 755 local->ops = ops; 756 757 /* set up some defaults */ 758 local->hw.queues = 1; 759 local->hw.max_rates = 1; 760 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD; 761 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD; 762 local->hw.conf.long_frame_max_tx_count = 4; 763 local->hw.conf.short_frame_max_tx_count = 7; 764 local->hw.conf.radio_enabled = true; 765 766 INIT_LIST_HEAD(&local->interfaces); 767 mutex_init(&local->iflist_mtx); 768 769 spin_lock_init(&local->key_lock); 770 771 spin_lock_init(&local->queue_stop_reason_lock); 772 773 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 774 775 INIT_WORK(&local->dynamic_ps_enable_work, 776 ieee80211_dynamic_ps_enable_work); 777 INIT_WORK(&local->dynamic_ps_disable_work, 778 ieee80211_dynamic_ps_disable_work); 779 setup_timer(&local->dynamic_ps_timer, 780 ieee80211_dynamic_ps_timer, (unsigned long) local); 781 782 sta_info_init(local); 783 784 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 785 (unsigned long)local); 786 tasklet_disable(&local->tx_pending_tasklet); 787 788 tasklet_init(&local->tasklet, 789 ieee80211_tasklet_handler, 790 (unsigned long) local); 791 tasklet_disable(&local->tasklet); 792 793 skb_queue_head_init(&local->skb_queue); 794 skb_queue_head_init(&local->skb_queue_unreliable); 795 796 return local_to_hw(local); 797} 798EXPORT_SYMBOL(ieee80211_alloc_hw); 799 800static const struct net_device_ops ieee80211_master_ops = { 801 .ndo_start_xmit = ieee80211_master_start_xmit, 802 .ndo_open = ieee80211_master_open, 803 .ndo_stop = ieee80211_master_stop, 804 .ndo_set_multicast_list = ieee80211_master_set_multicast_list, 805 .ndo_select_queue = ieee80211_select_queue, 806}; 807 808static void ieee80211_master_setup(struct net_device *mdev) 809{ 810 mdev->type = ARPHRD_IEEE80211; 811 mdev->netdev_ops = &ieee80211_master_ops; 812 mdev->header_ops = &ieee80211_header_ops; 813 mdev->tx_queue_len = 1000; 814 mdev->addr_len = ETH_ALEN; 815} 816 817int ieee80211_register_hw(struct ieee80211_hw *hw) 818{ 819 struct ieee80211_local *local = hw_to_local(hw); 820 int result; 821 enum ieee80211_band band; 822 struct net_device *mdev; 823 struct ieee80211_master_priv *mpriv; 824 int channels, i, j; 825 826 /* 827 * generic code guarantees at least one band, 828 * set this very early because much code assumes 829 * that hw.conf.channel is assigned 830 */ 831 channels = 0; 832 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 833 struct ieee80211_supported_band *sband; 834 835 sband = local->hw.wiphy->bands[band]; 836 if (sband && !local->oper_channel) { 837 /* init channel we're on */ 838 local->hw.conf.channel = 839 local->oper_channel = 840 local->scan_channel = &sband->channels[0]; 841 } 842 if (sband) 843 channels += sband->n_channels; 844 } 845 846 local->int_scan_req.n_channels = channels; 847 local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL); 848 if (!local->int_scan_req.channels) 849 return -ENOMEM; 850 851 /* if low-level driver supports AP, we also support VLAN */ 852 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) 853 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 854 855 /* mac80211 always supports monitor */ 856 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 857 858 result = wiphy_register(local->hw.wiphy); 859 if (result < 0) 860 goto fail_wiphy_register; 861 862 /* 863 * We use the number of queues for feature tests (QoS, HT) internally 864 * so restrict them appropriately. 865 */ 866 if (hw->queues > IEEE80211_MAX_QUEUES) 867 hw->queues = IEEE80211_MAX_QUEUES; 868 if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES) 869 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES; 870 if (hw->queues < 4) 871 hw->ampdu_queues = 0; 872 873 mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv), 874 "wmaster%d", ieee80211_master_setup, 875 ieee80211_num_queues(hw)); 876 if (!mdev) 877 goto fail_mdev_alloc; 878 879 mpriv = netdev_priv(mdev); 880 mpriv->local = local; 881 local->mdev = mdev; 882 883 local->hw.workqueue = 884 create_singlethread_workqueue(wiphy_name(local->hw.wiphy)); 885 if (!local->hw.workqueue) { 886 result = -ENOMEM; 887 goto fail_workqueue; 888 } 889 890 /* 891 * The hardware needs headroom for sending the frame, 892 * and we need some headroom for passing the frame to monitor 893 * interfaces, but never both at the same time. 894 */ 895 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 896 sizeof(struct ieee80211_tx_status_rtap_hdr)); 897 898 debugfs_hw_add(local); 899 900 if (local->hw.conf.beacon_int < 10) 901 local->hw.conf.beacon_int = 100; 902 903 if (local->hw.max_listen_interval == 0) 904 local->hw.max_listen_interval = 1; 905 906 local->hw.conf.listen_interval = local->hw.max_listen_interval; 907 908 result = sta_info_start(local); 909 if (result < 0) 910 goto fail_sta_info; 911 912 rtnl_lock(); 913 result = dev_alloc_name(local->mdev, local->mdev->name); 914 if (result < 0) 915 goto fail_dev; 916 917 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 918 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy)); 919 920 result = register_netdevice(local->mdev); 921 if (result < 0) 922 goto fail_dev; 923 924 result = ieee80211_init_rate_ctrl_alg(local, 925 hw->rate_control_algorithm); 926 if (result < 0) { 927 printk(KERN_DEBUG "%s: Failed to initialize rate control " 928 "algorithm\n", wiphy_name(local->hw.wiphy)); 929 goto fail_rate; 930 } 931 932 result = ieee80211_wep_init(local); 933 934 if (result < 0) { 935 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n", 936 wiphy_name(local->hw.wiphy), result); 937 goto fail_wep; 938 } 939 940 /* add one default STA interface if supported */ 941 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 942 result = ieee80211_if_add(local, "wlan%d", NULL, 943 NL80211_IFTYPE_STATION, NULL); 944 if (result) 945 printk(KERN_WARNING "%s: Failed to add default virtual iface\n", 946 wiphy_name(local->hw.wiphy)); 947 } 948 949 rtnl_unlock(); 950 951 ieee80211_led_init(local); 952 953 /* alloc internal scan request */ 954 i = 0; 955 local->int_scan_req.ssids = &local->scan_ssid; 956 local->int_scan_req.n_ssids = 1; 957 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 958 if (!hw->wiphy->bands[band]) 959 continue; 960 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) { 961 local->int_scan_req.channels[i] = 962 &hw->wiphy->bands[band]->channels[j]; 963 i++; 964 } 965 } 966 967 return 0; 968 969fail_wep: 970 rate_control_deinitialize(local); 971fail_rate: 972 unregister_netdevice(local->mdev); 973 local->mdev = NULL; 974fail_dev: 975 rtnl_unlock(); 976 sta_info_stop(local); 977fail_sta_info: 978 debugfs_hw_del(local); 979 destroy_workqueue(local->hw.workqueue); 980fail_workqueue: 981 if (local->mdev) 982 free_netdev(local->mdev); 983fail_mdev_alloc: 984 wiphy_unregister(local->hw.wiphy); 985fail_wiphy_register: 986 kfree(local->int_scan_req.channels); 987 return result; 988} 989EXPORT_SYMBOL(ieee80211_register_hw); 990 991void ieee80211_unregister_hw(struct ieee80211_hw *hw) 992{ 993 struct ieee80211_local *local = hw_to_local(hw); 994 995 tasklet_kill(&local->tx_pending_tasklet); 996 tasklet_kill(&local->tasklet); 997 998 rtnl_lock(); 999 1000 /* 1001 * At this point, interface list manipulations are fine 1002 * because the driver cannot be handing us frames any 1003 * more and the tasklet is killed. 1004 */ 1005 1006 /* First, we remove all virtual interfaces. */ 1007 ieee80211_remove_interfaces(local); 1008 1009 /* then, finally, remove the master interface */ 1010 unregister_netdevice(local->mdev); 1011 1012 rtnl_unlock(); 1013 1014 ieee80211_clear_tx_pending(local); 1015 sta_info_stop(local); 1016 rate_control_deinitialize(local); 1017 debugfs_hw_del(local); 1018 1019 if (skb_queue_len(&local->skb_queue) 1020 || skb_queue_len(&local->skb_queue_unreliable)) 1021 printk(KERN_WARNING "%s: skb_queue not empty\n", 1022 wiphy_name(local->hw.wiphy)); 1023 skb_queue_purge(&local->skb_queue); 1024 skb_queue_purge(&local->skb_queue_unreliable); 1025 1026 destroy_workqueue(local->hw.workqueue); 1027 wiphy_unregister(local->hw.wiphy); 1028 ieee80211_wep_free(local); 1029 ieee80211_led_exit(local); 1030 free_netdev(local->mdev); 1031 kfree(local->int_scan_req.channels); 1032} 1033EXPORT_SYMBOL(ieee80211_unregister_hw); 1034 1035void ieee80211_free_hw(struct ieee80211_hw *hw) 1036{ 1037 struct ieee80211_local *local = hw_to_local(hw); 1038 1039 mutex_destroy(&local->iflist_mtx); 1040 1041 wiphy_free(local->hw.wiphy); 1042} 1043EXPORT_SYMBOL(ieee80211_free_hw); 1044 1045static int __init ieee80211_init(void) 1046{ 1047 struct sk_buff *skb; 1048 int ret; 1049 1050 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1051 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1052 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1053 1054 ret = rc80211_minstrel_init(); 1055 if (ret) 1056 return ret; 1057 1058 ret = rc80211_pid_init(); 1059 if (ret) 1060 return ret; 1061 1062 ieee80211_debugfs_netdev_init(); 1063 1064 return 0; 1065} 1066 1067static void __exit ieee80211_exit(void) 1068{ 1069 rc80211_pid_exit(); 1070 rc80211_minstrel_exit(); 1071 1072 /* 1073 * For key todo, it'll be empty by now but the work 1074 * might still be scheduled. 1075 */ 1076 flush_scheduled_work(); 1077 1078 if (mesh_allocated) 1079 ieee80211s_stop(); 1080 1081 ieee80211_debugfs_netdev_exit(); 1082} 1083 1084 1085subsys_initcall(ieee80211_init); 1086module_exit(ieee80211_exit); 1087 1088MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1089MODULE_LICENSE("GPL"); 1090