main.c revision 469002983fc90c2ff0959e2b03335c0fe2e4d5a9
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 conf.bssid = sdata->u.mgd.bssid; 174 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 175 conf.bssid = sdata->u.ibss.bssid; 176 else if (sdata->vif.type == NL80211_IFTYPE_AP) 177 conf.bssid = sdata->dev->dev_addr; 178 else if (ieee80211_vif_is_mesh(&sdata->vif)) { 179 static const u8 zero[ETH_ALEN] = { 0 }; 180 conf.bssid = zero; 181 } else { 182 WARN_ON(1); 183 return -EINVAL; 184 } 185 186 switch (sdata->vif.type) { 187 case NL80211_IFTYPE_AP: 188 case NL80211_IFTYPE_ADHOC: 189 case NL80211_IFTYPE_MESH_POINT: 190 break; 191 default: 192 /* do not warn to simplify caller in scan.c */ 193 changed &= ~IEEE80211_IFCC_BEACON_ENABLED; 194 if (WARN_ON(changed & IEEE80211_IFCC_BEACON)) 195 return -EINVAL; 196 changed &= ~IEEE80211_IFCC_BEACON; 197 break; 198 } 199 200 if (changed & IEEE80211_IFCC_BEACON_ENABLED) { 201 if (local->sw_scanning) { 202 conf.enable_beacon = false; 203 } else { 204 /* 205 * Beacon should be enabled, but AP mode must 206 * check whether there is a beacon configured. 207 */ 208 switch (sdata->vif.type) { 209 case NL80211_IFTYPE_AP: 210 conf.enable_beacon = 211 !!rcu_dereference(sdata->u.ap.beacon); 212 break; 213 case NL80211_IFTYPE_ADHOC: 214 conf.enable_beacon = !!sdata->u.ibss.probe_resp; 215 break; 216 case NL80211_IFTYPE_MESH_POINT: 217 conf.enable_beacon = true; 218 break; 219 default: 220 /* not reached */ 221 WARN_ON(1); 222 break; 223 } 224 } 225 } 226 227 if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID))) 228 return -EINVAL; 229 230 conf.changed = changed; 231 232 return local->ops->config_interface(local_to_hw(local), 233 &sdata->vif, &conf); 234} 235 236int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 237{ 238 struct ieee80211_channel *chan; 239 int ret = 0; 240 int power; 241 enum nl80211_channel_type channel_type; 242 243 might_sleep(); 244 245 if (local->sw_scanning) { 246 chan = local->scan_channel; 247 channel_type = NL80211_CHAN_NO_HT; 248 } else { 249 chan = local->oper_channel; 250 channel_type = local->oper_channel_type; 251 } 252 253 if (chan != local->hw.conf.channel || 254 channel_type != local->hw.conf.channel_type) { 255 local->hw.conf.channel = chan; 256 local->hw.conf.channel_type = channel_type; 257 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 258 } 259 260 if (local->sw_scanning) 261 power = chan->max_power; 262 else 263 power = local->power_constr_level ? 264 (chan->max_power - local->power_constr_level) : 265 chan->max_power; 266 267 if (local->user_power_level) 268 power = min(power, local->user_power_level); 269 270 if (local->hw.conf.power_level != power) { 271 changed |= IEEE80211_CONF_CHANGE_POWER; 272 local->hw.conf.power_level = power; 273 } 274 275 if (changed && local->open_count) { 276 ret = local->ops->config(local_to_hw(local), changed); 277 /* 278 * Goal: 279 * HW reconfiguration should never fail, the driver has told 280 * us what it can support so it should live up to that promise. 281 * 282 * Current status: 283 * rfkill is not integrated with mac80211 and a 284 * configuration command can thus fail if hardware rfkill 285 * is enabled 286 * 287 * FIXME: integrate rfkill with mac80211 and then add this 288 * WARN_ON() back 289 * 290 */ 291 /* WARN_ON(ret); */ 292 } 293 294 return ret; 295} 296 297void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 298 u32 changed) 299{ 300 struct ieee80211_local *local = sdata->local; 301 302 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 303 return; 304 305 if (!changed) 306 return; 307 308 if (local->ops->bss_info_changed) 309 local->ops->bss_info_changed(local_to_hw(local), 310 &sdata->vif, 311 &sdata->vif.bss_conf, 312 changed); 313} 314 315u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 316{ 317 sdata->vif.bss_conf.use_cts_prot = false; 318 sdata->vif.bss_conf.use_short_preamble = false; 319 sdata->vif.bss_conf.use_short_slot = false; 320 return BSS_CHANGED_ERP_CTS_PROT | 321 BSS_CHANGED_ERP_PREAMBLE | 322 BSS_CHANGED_ERP_SLOT; 323} 324 325void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, 326 struct sk_buff *skb) 327{ 328 struct ieee80211_local *local = hw_to_local(hw); 329 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 330 int tmp; 331 332 skb->dev = local->mdev; 333 skb->pkt_type = IEEE80211_TX_STATUS_MSG; 334 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ? 335 &local->skb_queue : &local->skb_queue_unreliable, skb); 336 tmp = skb_queue_len(&local->skb_queue) + 337 skb_queue_len(&local->skb_queue_unreliable); 338 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && 339 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 340 dev_kfree_skb_irq(skb); 341 tmp--; 342 I802_DEBUG_INC(local->tx_status_drop); 343 } 344 tasklet_schedule(&local->tasklet); 345} 346EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); 347 348static void ieee80211_tasklet_handler(unsigned long data) 349{ 350 struct ieee80211_local *local = (struct ieee80211_local *) data; 351 struct sk_buff *skb; 352 struct ieee80211_rx_status rx_status; 353 struct ieee80211_ra_tid *ra_tid; 354 355 while ((skb = skb_dequeue(&local->skb_queue)) || 356 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 357 switch (skb->pkt_type) { 358 case IEEE80211_RX_MSG: 359 /* status is in skb->cb */ 360 memcpy(&rx_status, skb->cb, sizeof(rx_status)); 361 /* Clear skb->pkt_type in order to not confuse kernel 362 * netstack. */ 363 skb->pkt_type = 0; 364 __ieee80211_rx(local_to_hw(local), skb, &rx_status); 365 break; 366 case IEEE80211_TX_STATUS_MSG: 367 skb->pkt_type = 0; 368 ieee80211_tx_status(local_to_hw(local), skb); 369 break; 370 case IEEE80211_DELBA_MSG: 371 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 372 ieee80211_stop_tx_ba_cb(local_to_hw(local), 373 ra_tid->ra, ra_tid->tid); 374 dev_kfree_skb(skb); 375 break; 376 case IEEE80211_ADDBA_MSG: 377 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 378 ieee80211_start_tx_ba_cb(local_to_hw(local), 379 ra_tid->ra, ra_tid->tid); 380 dev_kfree_skb(skb); 381 break ; 382 default: 383 WARN(1, "mac80211: Packet is of unknown type %d\n", 384 skb->pkt_type); 385 dev_kfree_skb(skb); 386 break; 387 } 388 } 389} 390 391/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to 392 * make a prepared TX frame (one that has been given to hw) to look like brand 393 * new IEEE 802.11 frame that is ready to go through TX processing again. 394 */ 395static void ieee80211_remove_tx_extra(struct ieee80211_local *local, 396 struct ieee80211_key *key, 397 struct sk_buff *skb) 398{ 399 unsigned int hdrlen, iv_len, mic_len; 400 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 401 402 hdrlen = ieee80211_hdrlen(hdr->frame_control); 403 404 if (!key) 405 goto no_key; 406 407 switch (key->conf.alg) { 408 case ALG_WEP: 409 iv_len = WEP_IV_LEN; 410 mic_len = WEP_ICV_LEN; 411 break; 412 case ALG_TKIP: 413 iv_len = TKIP_IV_LEN; 414 mic_len = TKIP_ICV_LEN; 415 break; 416 case ALG_CCMP: 417 iv_len = CCMP_HDR_LEN; 418 mic_len = CCMP_MIC_LEN; 419 break; 420 default: 421 goto no_key; 422 } 423 424 if (skb->len >= hdrlen + mic_len && 425 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 426 skb_trim(skb, skb->len - mic_len); 427 if (skb->len >= hdrlen + iv_len) { 428 memmove(skb->data + iv_len, skb->data, hdrlen); 429 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len); 430 } 431 432no_key: 433 if (ieee80211_is_data_qos(hdr->frame_control)) { 434 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 435 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data, 436 hdrlen - IEEE80211_QOS_CTL_LEN); 437 skb_pull(skb, IEEE80211_QOS_CTL_LEN); 438 } 439} 440 441static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, 442 struct sta_info *sta, 443 struct sk_buff *skb) 444{ 445 sta->tx_filtered_count++; 446 447 /* 448 * Clear the TX filter mask for this STA when sending the next 449 * packet. If the STA went to power save mode, this will happen 450 * when it wakes up for the next time. 451 */ 452 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT); 453 454 /* 455 * This code races in the following way: 456 * 457 * (1) STA sends frame indicating it will go to sleep and does so 458 * (2) hardware/firmware adds STA to filter list, passes frame up 459 * (3) hardware/firmware processes TX fifo and suppresses a frame 460 * (4) we get TX status before having processed the frame and 461 * knowing that the STA has gone to sleep. 462 * 463 * This is actually quite unlikely even when both those events are 464 * processed from interrupts coming in quickly after one another or 465 * even at the same time because we queue both TX status events and 466 * RX frames to be processed by a tasklet and process them in the 467 * same order that they were received or TX status last. Hence, there 468 * is no race as long as the frame RX is processed before the next TX 469 * status, which drivers can ensure, see below. 470 * 471 * Note that this can only happen if the hardware or firmware can 472 * actually add STAs to the filter list, if this is done by the 473 * driver in response to set_tim() (which will only reduce the race 474 * this whole filtering tries to solve, not completely solve it) 475 * this situation cannot happen. 476 * 477 * To completely solve this race drivers need to make sure that they 478 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 479 * functions and 480 * (b) always process RX events before TX status events if ordering 481 * can be unknown, for example with different interrupt status 482 * bits. 483 */ 484 if (test_sta_flags(sta, WLAN_STA_PS) && 485 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) { 486 ieee80211_remove_tx_extra(local, sta->key, skb); 487 skb_queue_tail(&sta->tx_filtered, skb); 488 return; 489 } 490 491 if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) { 492 /* Software retry the packet once */ 493 skb->requeue = 1; 494 ieee80211_remove_tx_extra(local, sta->key, skb); 495 dev_queue_xmit(skb); 496 return; 497 } 498 499#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 500 if (net_ratelimit()) 501 printk(KERN_DEBUG "%s: dropped TX filtered frame, " 502 "queue_len=%d PS=%d @%lu\n", 503 wiphy_name(local->hw.wiphy), 504 skb_queue_len(&sta->tx_filtered), 505 !!test_sta_flags(sta, WLAN_STA_PS), jiffies); 506#endif 507 dev_kfree_skb(skb); 508} 509 510void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 511{ 512 struct sk_buff *skb2; 513 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 514 struct ieee80211_local *local = hw_to_local(hw); 515 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 516 u16 frag, type; 517 __le16 fc; 518 struct ieee80211_supported_band *sband; 519 struct ieee80211_tx_status_rtap_hdr *rthdr; 520 struct ieee80211_sub_if_data *sdata; 521 struct net_device *prev_dev = NULL; 522 struct sta_info *sta; 523 int retry_count = -1, i; 524 525 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 526 /* the HW cannot have attempted that rate */ 527 if (i >= hw->max_rates) { 528 info->status.rates[i].idx = -1; 529 info->status.rates[i].count = 0; 530 } 531 532 retry_count += info->status.rates[i].count; 533 } 534 if (retry_count < 0) 535 retry_count = 0; 536 537 rcu_read_lock(); 538 539 sband = local->hw.wiphy->bands[info->band]; 540 541 sta = sta_info_get(local, hdr->addr1); 542 543 if (sta) { 544 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 545 test_sta_flags(sta, WLAN_STA_PS)) { 546 /* 547 * The STA is in power save mode, so assume 548 * that this TX packet failed because of that. 549 */ 550 ieee80211_handle_filtered_frame(local, sta, skb); 551 rcu_read_unlock(); 552 return; 553 } 554 555 fc = hdr->frame_control; 556 557 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 558 (ieee80211_is_data_qos(fc))) { 559 u16 tid, ssn; 560 u8 *qc; 561 562 qc = ieee80211_get_qos_ctl(hdr); 563 tid = qc[0] & 0xf; 564 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 565 & IEEE80211_SCTL_SEQ); 566 ieee80211_send_bar(sta->sdata, hdr->addr1, 567 tid, ssn); 568 } 569 570 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 571 ieee80211_handle_filtered_frame(local, sta, skb); 572 rcu_read_unlock(); 573 return; 574 } else { 575 if (!(info->flags & IEEE80211_TX_STAT_ACK)) 576 sta->tx_retry_failed++; 577 sta->tx_retry_count += retry_count; 578 } 579 580 rate_control_tx_status(local, sband, sta, skb); 581 } 582 583 rcu_read_unlock(); 584 585 ieee80211_led_tx(local, 0); 586 587 /* SNMP counters 588 * Fragments are passed to low-level drivers as separate skbs, so these 589 * are actually fragments, not frames. Update frame counters only for 590 * the first fragment of the frame. */ 591 592 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG; 593 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE; 594 595 if (info->flags & IEEE80211_TX_STAT_ACK) { 596 if (frag == 0) { 597 local->dot11TransmittedFrameCount++; 598 if (is_multicast_ether_addr(hdr->addr1)) 599 local->dot11MulticastTransmittedFrameCount++; 600 if (retry_count > 0) 601 local->dot11RetryCount++; 602 if (retry_count > 1) 603 local->dot11MultipleRetryCount++; 604 } 605 606 /* This counter shall be incremented for an acknowledged MPDU 607 * with an individual address in the address 1 field or an MPDU 608 * with a multicast address in the address 1 field of type Data 609 * or Management. */ 610 if (!is_multicast_ether_addr(hdr->addr1) || 611 type == IEEE80211_FTYPE_DATA || 612 type == IEEE80211_FTYPE_MGMT) 613 local->dot11TransmittedFragmentCount++; 614 } else { 615 if (frag == 0) 616 local->dot11FailedCount++; 617 } 618 619 /* this was a transmitted frame, but now we want to reuse it */ 620 skb_orphan(skb); 621 622 /* 623 * This is a bit racy but we can avoid a lot of work 624 * with this test... 625 */ 626 if (!local->monitors && !local->cooked_mntrs) { 627 dev_kfree_skb(skb); 628 return; 629 } 630 631 /* send frame to monitor interfaces now */ 632 633 if (skb_headroom(skb) < sizeof(*rthdr)) { 634 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n"); 635 dev_kfree_skb(skb); 636 return; 637 } 638 639 rthdr = (struct ieee80211_tx_status_rtap_hdr *) 640 skb_push(skb, sizeof(*rthdr)); 641 642 memset(rthdr, 0, sizeof(*rthdr)); 643 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); 644 rthdr->hdr.it_present = 645 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 646 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) | 647 (1 << IEEE80211_RADIOTAP_RATE)); 648 649 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 650 !is_multicast_ether_addr(hdr->addr1)) 651 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL); 652 653 /* 654 * XXX: Once radiotap gets the bitmap reset thing the vendor 655 * extensions proposal contains, we can actually report 656 * the whole set of tries we did. 657 */ 658 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || 659 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) 660 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS); 661 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 662 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS); 663 if (info->status.rates[0].idx >= 0 && 664 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) 665 rthdr->rate = sband->bitrates[ 666 info->status.rates[0].idx].bitrate / 5; 667 668 /* for now report the total retry_count */ 669 rthdr->data_retries = retry_count; 670 671 /* XXX: is this sufficient for BPF? */ 672 skb_set_mac_header(skb, 0); 673 skb->ip_summed = CHECKSUM_UNNECESSARY; 674 skb->pkt_type = PACKET_OTHERHOST; 675 skb->protocol = htons(ETH_P_802_2); 676 memset(skb->cb, 0, sizeof(skb->cb)); 677 678 rcu_read_lock(); 679 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 680 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 681 if (!netif_running(sdata->dev)) 682 continue; 683 684 if (prev_dev) { 685 skb2 = skb_clone(skb, GFP_ATOMIC); 686 if (skb2) { 687 skb2->dev = prev_dev; 688 netif_rx(skb2); 689 } 690 } 691 692 prev_dev = sdata->dev; 693 } 694 } 695 if (prev_dev) { 696 skb->dev = prev_dev; 697 netif_rx(skb); 698 skb = NULL; 699 } 700 rcu_read_unlock(); 701 dev_kfree_skb(skb); 702} 703EXPORT_SYMBOL(ieee80211_tx_status); 704 705struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 706 const struct ieee80211_ops *ops) 707{ 708 struct ieee80211_local *local; 709 int priv_size, i; 710 struct wiphy *wiphy; 711 712 /* Ensure 32-byte alignment of our private data and hw private data. 713 * We use the wiphy priv data for both our ieee80211_local and for 714 * the driver's private data 715 * 716 * In memory it'll be like this: 717 * 718 * +-------------------------+ 719 * | struct wiphy | 720 * +-------------------------+ 721 * | struct ieee80211_local | 722 * +-------------------------+ 723 * | driver's private data | 724 * +-------------------------+ 725 * 726 */ 727 priv_size = ((sizeof(struct ieee80211_local) + 728 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) + 729 priv_data_len; 730 731 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 732 733 if (!wiphy) 734 return NULL; 735 736 wiphy->privid = mac80211_wiphy_privid; 737 wiphy->max_scan_ssids = 4; 738 /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */ 739 wiphy->bss_priv_size = sizeof(struct ieee80211_bss) - 740 sizeof(struct cfg80211_bss); 741 742 local = wiphy_priv(wiphy); 743 local->hw.wiphy = wiphy; 744 745 local->hw.priv = (char *)local + 746 ((sizeof(struct ieee80211_local) + 747 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST); 748 749 BUG_ON(!ops->tx); 750 BUG_ON(!ops->start); 751 BUG_ON(!ops->stop); 752 BUG_ON(!ops->config); 753 BUG_ON(!ops->add_interface); 754 BUG_ON(!ops->remove_interface); 755 BUG_ON(!ops->configure_filter); 756 local->ops = ops; 757 758 /* set up some defaults */ 759 local->hw.queues = 1; 760 local->hw.max_rates = 1; 761 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD; 762 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD; 763 local->hw.conf.long_frame_max_tx_count = 4; 764 local->hw.conf.short_frame_max_tx_count = 7; 765 local->hw.conf.radio_enabled = true; 766 767 INIT_LIST_HEAD(&local->interfaces); 768 mutex_init(&local->iflist_mtx); 769 770 spin_lock_init(&local->key_lock); 771 772 spin_lock_init(&local->queue_stop_reason_lock); 773 774 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 775 776 INIT_WORK(&local->dynamic_ps_enable_work, 777 ieee80211_dynamic_ps_enable_work); 778 INIT_WORK(&local->dynamic_ps_disable_work, 779 ieee80211_dynamic_ps_disable_work); 780 setup_timer(&local->dynamic_ps_timer, 781 ieee80211_dynamic_ps_timer, (unsigned long) local); 782 783 for (i = 0; i < IEEE80211_MAX_AMPDU_QUEUES; i++) 784 local->ampdu_ac_queue[i] = -1; 785 /* using an s8 won't work with more than that */ 786 BUILD_BUG_ON(IEEE80211_MAX_AMPDU_QUEUES > 127); 787 788 sta_info_init(local); 789 790 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 791 (unsigned long)local); 792 tasklet_disable(&local->tx_pending_tasklet); 793 794 tasklet_init(&local->tasklet, 795 ieee80211_tasklet_handler, 796 (unsigned long) local); 797 tasklet_disable(&local->tasklet); 798 799 skb_queue_head_init(&local->skb_queue); 800 skb_queue_head_init(&local->skb_queue_unreliable); 801 802 return local_to_hw(local); 803} 804EXPORT_SYMBOL(ieee80211_alloc_hw); 805 806static const struct net_device_ops ieee80211_master_ops = { 807 .ndo_start_xmit = ieee80211_master_start_xmit, 808 .ndo_open = ieee80211_master_open, 809 .ndo_stop = ieee80211_master_stop, 810 .ndo_set_multicast_list = ieee80211_master_set_multicast_list, 811 .ndo_select_queue = ieee80211_select_queue, 812}; 813 814static void ieee80211_master_setup(struct net_device *mdev) 815{ 816 mdev->type = ARPHRD_IEEE80211; 817 mdev->netdev_ops = &ieee80211_master_ops; 818 mdev->header_ops = &ieee80211_header_ops; 819 mdev->tx_queue_len = 1000; 820 mdev->addr_len = ETH_ALEN; 821} 822 823int ieee80211_register_hw(struct ieee80211_hw *hw) 824{ 825 struct ieee80211_local *local = hw_to_local(hw); 826 int result; 827 enum ieee80211_band band; 828 struct net_device *mdev; 829 struct ieee80211_master_priv *mpriv; 830 int channels, i, j; 831 832 /* 833 * generic code guarantees at least one band, 834 * set this very early because much code assumes 835 * that hw.conf.channel is assigned 836 */ 837 channels = 0; 838 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 839 struct ieee80211_supported_band *sband; 840 841 sband = local->hw.wiphy->bands[band]; 842 if (sband && !local->oper_channel) { 843 /* init channel we're on */ 844 local->hw.conf.channel = 845 local->oper_channel = 846 local->scan_channel = &sband->channels[0]; 847 } 848 if (sband) 849 channels += sband->n_channels; 850 } 851 852 local->int_scan_req.n_channels = channels; 853 local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL); 854 if (!local->int_scan_req.channels) 855 return -ENOMEM; 856 857 /* if low-level driver supports AP, we also support VLAN */ 858 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) 859 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 860 861 /* mac80211 always supports monitor */ 862 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 863 864 result = wiphy_register(local->hw.wiphy); 865 if (result < 0) 866 goto fail_wiphy_register; 867 868 /* 869 * We use the number of queues for feature tests (QoS, HT) internally 870 * so restrict them appropriately. 871 */ 872 if (hw->queues > IEEE80211_MAX_QUEUES) 873 hw->queues = IEEE80211_MAX_QUEUES; 874 if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES) 875 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES; 876 if (hw->queues < 4) 877 hw->ampdu_queues = 0; 878 879 mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv), 880 "wmaster%d", ieee80211_master_setup, 881 hw->queues); 882 if (!mdev) 883 goto fail_mdev_alloc; 884 885 mpriv = netdev_priv(mdev); 886 mpriv->local = local; 887 local->mdev = mdev; 888 889 local->hw.workqueue = 890 create_singlethread_workqueue(wiphy_name(local->hw.wiphy)); 891 if (!local->hw.workqueue) { 892 result = -ENOMEM; 893 goto fail_workqueue; 894 } 895 896 /* 897 * The hardware needs headroom for sending the frame, 898 * and we need some headroom for passing the frame to monitor 899 * interfaces, but never both at the same time. 900 */ 901 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 902 sizeof(struct ieee80211_tx_status_rtap_hdr)); 903 904 debugfs_hw_add(local); 905 906 if (local->hw.conf.beacon_int < 10) 907 local->hw.conf.beacon_int = 100; 908 909 if (local->hw.max_listen_interval == 0) 910 local->hw.max_listen_interval = 1; 911 912 local->hw.conf.listen_interval = local->hw.max_listen_interval; 913 914 result = sta_info_start(local); 915 if (result < 0) 916 goto fail_sta_info; 917 918 rtnl_lock(); 919 result = dev_alloc_name(local->mdev, local->mdev->name); 920 if (result < 0) 921 goto fail_dev; 922 923 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 924 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy)); 925 local->mdev->features |= NETIF_F_NETNS_LOCAL; 926 927 result = register_netdevice(local->mdev); 928 if (result < 0) 929 goto fail_dev; 930 931 result = ieee80211_init_rate_ctrl_alg(local, 932 hw->rate_control_algorithm); 933 if (result < 0) { 934 printk(KERN_DEBUG "%s: Failed to initialize rate control " 935 "algorithm\n", wiphy_name(local->hw.wiphy)); 936 goto fail_rate; 937 } 938 939 result = ieee80211_wep_init(local); 940 941 if (result < 0) { 942 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n", 943 wiphy_name(local->hw.wiphy), result); 944 goto fail_wep; 945 } 946 947 /* add one default STA interface if supported */ 948 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 949 result = ieee80211_if_add(local, "wlan%d", NULL, 950 NL80211_IFTYPE_STATION, NULL); 951 if (result) 952 printk(KERN_WARNING "%s: Failed to add default virtual iface\n", 953 wiphy_name(local->hw.wiphy)); 954 } 955 956 rtnl_unlock(); 957 958 ieee80211_led_init(local); 959 960 /* alloc internal scan request */ 961 i = 0; 962 local->int_scan_req.ssids = &local->scan_ssid; 963 local->int_scan_req.n_ssids = 1; 964 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 965 if (!hw->wiphy->bands[band]) 966 continue; 967 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) { 968 local->int_scan_req.channels[i] = 969 &hw->wiphy->bands[band]->channels[j]; 970 i++; 971 } 972 } 973 974 return 0; 975 976fail_wep: 977 rate_control_deinitialize(local); 978fail_rate: 979 unregister_netdevice(local->mdev); 980 local->mdev = NULL; 981fail_dev: 982 rtnl_unlock(); 983 sta_info_stop(local); 984fail_sta_info: 985 debugfs_hw_del(local); 986 destroy_workqueue(local->hw.workqueue); 987fail_workqueue: 988 if (local->mdev) 989 free_netdev(local->mdev); 990fail_mdev_alloc: 991 wiphy_unregister(local->hw.wiphy); 992fail_wiphy_register: 993 kfree(local->int_scan_req.channels); 994 return result; 995} 996EXPORT_SYMBOL(ieee80211_register_hw); 997 998void ieee80211_unregister_hw(struct ieee80211_hw *hw) 999{ 1000 struct ieee80211_local *local = hw_to_local(hw); 1001 1002 tasklet_kill(&local->tx_pending_tasklet); 1003 tasklet_kill(&local->tasklet); 1004 1005 rtnl_lock(); 1006 1007 /* 1008 * At this point, interface list manipulations are fine 1009 * because the driver cannot be handing us frames any 1010 * more and the tasklet is killed. 1011 */ 1012 1013 /* First, we remove all virtual interfaces. */ 1014 ieee80211_remove_interfaces(local); 1015 1016 /* then, finally, remove the master interface */ 1017 unregister_netdevice(local->mdev); 1018 1019 rtnl_unlock(); 1020 1021 ieee80211_clear_tx_pending(local); 1022 sta_info_stop(local); 1023 rate_control_deinitialize(local); 1024 debugfs_hw_del(local); 1025 1026 if (skb_queue_len(&local->skb_queue) 1027 || skb_queue_len(&local->skb_queue_unreliable)) 1028 printk(KERN_WARNING "%s: skb_queue not empty\n", 1029 wiphy_name(local->hw.wiphy)); 1030 skb_queue_purge(&local->skb_queue); 1031 skb_queue_purge(&local->skb_queue_unreliable); 1032 1033 destroy_workqueue(local->hw.workqueue); 1034 wiphy_unregister(local->hw.wiphy); 1035 ieee80211_wep_free(local); 1036 ieee80211_led_exit(local); 1037 free_netdev(local->mdev); 1038 kfree(local->int_scan_req.channels); 1039} 1040EXPORT_SYMBOL(ieee80211_unregister_hw); 1041 1042void ieee80211_free_hw(struct ieee80211_hw *hw) 1043{ 1044 struct ieee80211_local *local = hw_to_local(hw); 1045 1046 mutex_destroy(&local->iflist_mtx); 1047 1048 wiphy_free(local->hw.wiphy); 1049} 1050EXPORT_SYMBOL(ieee80211_free_hw); 1051 1052static int __init ieee80211_init(void) 1053{ 1054 struct sk_buff *skb; 1055 int ret; 1056 1057 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1058 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1059 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1060 1061 ret = rc80211_minstrel_init(); 1062 if (ret) 1063 return ret; 1064 1065 ret = rc80211_pid_init(); 1066 if (ret) 1067 return ret; 1068 1069 ieee80211_debugfs_netdev_init(); 1070 1071 return 0; 1072} 1073 1074static void __exit ieee80211_exit(void) 1075{ 1076 rc80211_pid_exit(); 1077 rc80211_minstrel_exit(); 1078 1079 /* 1080 * For key todo, it'll be empty by now but the work 1081 * might still be scheduled. 1082 */ 1083 flush_scheduled_work(); 1084 1085 if (mesh_allocated) 1086 ieee80211s_stop(); 1087 1088 ieee80211_debugfs_netdev_exit(); 1089} 1090 1091 1092subsys_initcall(ieee80211_init); 1093module_exit(ieee80211_exit); 1094 1095MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1096MODULE_LICENSE("GPL"); 1097