main.c revision 2448798133d747ad339e57099e32a1d1e68aca1c
1/* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11#include <net/mac80211.h> 12#include <net/ieee80211_radiotap.h> 13#include <linux/module.h> 14#include <linux/init.h> 15#include <linux/netdevice.h> 16#include <linux/types.h> 17#include <linux/slab.h> 18#include <linux/skbuff.h> 19#include <linux/etherdevice.h> 20#include <linux/if_arp.h> 21#include <linux/wireless.h> 22#include <linux/rtnetlink.h> 23#include <linux/bitmap.h> 24#include <linux/pm_qos_params.h> 25#include <net/net_namespace.h> 26#include <net/cfg80211.h> 27 28#include "ieee80211_i.h" 29#include "driver-ops.h" 30#include "rate.h" 31#include "mesh.h" 32#include "wep.h" 33#include "wme.h" 34#include "aes_ccm.h" 35#include "led.h" 36#include "cfg.h" 37#include "debugfs.h" 38#include "debugfs_netdev.h" 39 40/* 41 * For seeing transmitted packets on monitor interfaces 42 * we have a radiotap header too. 43 */ 44struct ieee80211_tx_status_rtap_hdr { 45 struct ieee80211_radiotap_header hdr; 46 u8 rate; 47 u8 padding_for_rate; 48 __le16 tx_flags; 49 u8 data_retries; 50} __attribute__ ((packed)); 51 52 53/* must be called under mdev tx lock */ 54void ieee80211_configure_filter(struct ieee80211_local *local) 55{ 56 unsigned int changed_flags; 57 unsigned int new_flags = 0; 58 59 if (atomic_read(&local->iff_promiscs)) 60 new_flags |= FIF_PROMISC_IN_BSS; 61 62 if (atomic_read(&local->iff_allmultis)) 63 new_flags |= FIF_ALLMULTI; 64 65 if (local->monitors) 66 new_flags |= FIF_BCN_PRBRESP_PROMISC; 67 68 if (local->fif_fcsfail) 69 new_flags |= FIF_FCSFAIL; 70 71 if (local->fif_plcpfail) 72 new_flags |= FIF_PLCPFAIL; 73 74 if (local->fif_control) 75 new_flags |= FIF_CONTROL; 76 77 if (local->fif_other_bss) 78 new_flags |= FIF_OTHER_BSS; 79 80 changed_flags = local->filter_flags ^ new_flags; 81 82 /* be a bit nasty */ 83 new_flags |= (1<<31); 84 85 drv_configure_filter(local, changed_flags, &new_flags, 86 local->mdev->mc_count, 87 local->mdev->mc_list); 88 89 WARN_ON(new_flags & (1<<31)); 90 91 local->filter_flags = new_flags & ~(1<<31); 92} 93 94/* master interface */ 95 96static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr) 97{ 98 memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */ 99 return ETH_ALEN; 100} 101 102static const struct header_ops ieee80211_header_ops = { 103 .create = eth_header, 104 .parse = header_parse_80211, 105 .rebuild = eth_rebuild_header, 106 .cache = eth_header_cache, 107 .cache_update = eth_header_cache_update, 108}; 109 110static int ieee80211_master_open(struct net_device *dev) 111{ 112 struct ieee80211_master_priv *mpriv = netdev_priv(dev); 113 struct ieee80211_local *local = mpriv->local; 114 struct ieee80211_sub_if_data *sdata; 115 int res = -EOPNOTSUPP; 116 117 /* we hold the RTNL here so can safely walk the list */ 118 list_for_each_entry(sdata, &local->interfaces, list) { 119 if (netif_running(sdata->dev)) { 120 res = 0; 121 break; 122 } 123 } 124 125 if (res) 126 return res; 127 128 netif_tx_start_all_queues(local->mdev); 129 130 return 0; 131} 132 133static int ieee80211_master_stop(struct net_device *dev) 134{ 135 struct ieee80211_master_priv *mpriv = netdev_priv(dev); 136 struct ieee80211_local *local = mpriv->local; 137 struct ieee80211_sub_if_data *sdata; 138 139 /* we hold the RTNL here so can safely walk the list */ 140 list_for_each_entry(sdata, &local->interfaces, list) 141 if (netif_running(sdata->dev)) 142 dev_close(sdata->dev); 143 144 return 0; 145} 146 147static void ieee80211_master_set_multicast_list(struct net_device *dev) 148{ 149 struct ieee80211_master_priv *mpriv = netdev_priv(dev); 150 struct ieee80211_local *local = mpriv->local; 151 152 ieee80211_configure_filter(local); 153} 154 155int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 156{ 157 struct ieee80211_channel *chan; 158 int ret = 0; 159 int power; 160 enum nl80211_channel_type channel_type; 161 162 might_sleep(); 163 164 if (local->sw_scanning) { 165 chan = local->scan_channel; 166 channel_type = NL80211_CHAN_NO_HT; 167 } else { 168 chan = local->oper_channel; 169 channel_type = local->oper_channel_type; 170 } 171 172 if (chan != local->hw.conf.channel || 173 channel_type != local->hw.conf.channel_type) { 174 local->hw.conf.channel = chan; 175 local->hw.conf.channel_type = channel_type; 176 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 177 } 178 179 if (local->sw_scanning) 180 power = chan->max_power; 181 else 182 power = local->power_constr_level ? 183 (chan->max_power - local->power_constr_level) : 184 chan->max_power; 185 186 if (local->user_power_level >= 0) 187 power = min(power, local->user_power_level); 188 189 if (local->hw.conf.power_level != power) { 190 changed |= IEEE80211_CONF_CHANGE_POWER; 191 local->hw.conf.power_level = power; 192 } 193 194 if (changed && local->open_count) { 195 ret = drv_config(local, changed); 196 /* 197 * Goal: 198 * HW reconfiguration should never fail, the driver has told 199 * us what it can support so it should live up to that promise. 200 * 201 * Current status: 202 * rfkill is not integrated with mac80211 and a 203 * configuration command can thus fail if hardware rfkill 204 * is enabled 205 * 206 * FIXME: integrate rfkill with mac80211 and then add this 207 * WARN_ON() back 208 * 209 */ 210 /* WARN_ON(ret); */ 211 } 212 213 return ret; 214} 215 216void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 217 u32 changed) 218{ 219 struct ieee80211_local *local = sdata->local; 220 221 if (!changed) 222 return; 223 224 if (sdata->vif.type == NL80211_IFTYPE_STATION) 225 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 226 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 227 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 228 else if (sdata->vif.type == NL80211_IFTYPE_AP) 229 sdata->vif.bss_conf.bssid = sdata->dev->dev_addr; 230 else if (ieee80211_vif_is_mesh(&sdata->vif)) { 231 static const u8 zero[ETH_ALEN] = { 0 }; 232 sdata->vif.bss_conf.bssid = zero; 233 } else { 234 WARN_ON(1); 235 return; 236 } 237 238 switch (sdata->vif.type) { 239 case NL80211_IFTYPE_AP: 240 case NL80211_IFTYPE_ADHOC: 241 case NL80211_IFTYPE_MESH_POINT: 242 break; 243 default: 244 /* do not warn to simplify caller in scan.c */ 245 changed &= ~BSS_CHANGED_BEACON_ENABLED; 246 if (WARN_ON(changed & BSS_CHANGED_BEACON)) 247 return; 248 break; 249 } 250 251 if (changed & BSS_CHANGED_BEACON_ENABLED) { 252 if (local->sw_scanning) { 253 sdata->vif.bss_conf.enable_beacon = false; 254 } else { 255 /* 256 * Beacon should be enabled, but AP mode must 257 * check whether there is a beacon configured. 258 */ 259 switch (sdata->vif.type) { 260 case NL80211_IFTYPE_AP: 261 sdata->vif.bss_conf.enable_beacon = 262 !!rcu_dereference(sdata->u.ap.beacon); 263 break; 264 case NL80211_IFTYPE_ADHOC: 265 sdata->vif.bss_conf.enable_beacon = 266 !!rcu_dereference(sdata->u.ibss.presp); 267 break; 268 case NL80211_IFTYPE_MESH_POINT: 269 sdata->vif.bss_conf.enable_beacon = true; 270 break; 271 default: 272 /* not reached */ 273 WARN_ON(1); 274 break; 275 } 276 } 277 } 278 279 drv_bss_info_changed(local, &sdata->vif, 280 &sdata->vif.bss_conf, changed); 281 282 /* 283 * DEPRECATED 284 * 285 * ~changed is just there to not do this at resume time 286 */ 287 if (changed & BSS_CHANGED_BEACON_INT && ~changed) { 288 local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int; 289 ieee80211_hw_config(local, 290 _IEEE80211_CONF_CHANGE_BEACON_INTERVAL); 291 } 292} 293 294u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 295{ 296 sdata->vif.bss_conf.use_cts_prot = false; 297 sdata->vif.bss_conf.use_short_preamble = false; 298 sdata->vif.bss_conf.use_short_slot = false; 299 return BSS_CHANGED_ERP_CTS_PROT | 300 BSS_CHANGED_ERP_PREAMBLE | 301 BSS_CHANGED_ERP_SLOT; 302} 303 304void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, 305 struct sk_buff *skb) 306{ 307 struct ieee80211_local *local = hw_to_local(hw); 308 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 309 int tmp; 310 311 skb->dev = local->mdev; 312 skb->pkt_type = IEEE80211_TX_STATUS_MSG; 313 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ? 314 &local->skb_queue : &local->skb_queue_unreliable, skb); 315 tmp = skb_queue_len(&local->skb_queue) + 316 skb_queue_len(&local->skb_queue_unreliable); 317 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && 318 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 319 dev_kfree_skb_irq(skb); 320 tmp--; 321 I802_DEBUG_INC(local->tx_status_drop); 322 } 323 tasklet_schedule(&local->tasklet); 324} 325EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); 326 327static void ieee80211_tasklet_handler(unsigned long data) 328{ 329 struct ieee80211_local *local = (struct ieee80211_local *) data; 330 struct sk_buff *skb; 331 struct ieee80211_rx_status rx_status; 332 struct ieee80211_ra_tid *ra_tid; 333 334 while ((skb = skb_dequeue(&local->skb_queue)) || 335 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 336 switch (skb->pkt_type) { 337 case IEEE80211_RX_MSG: 338 /* status is in skb->cb */ 339 memcpy(&rx_status, skb->cb, sizeof(rx_status)); 340 /* Clear skb->pkt_type in order to not confuse kernel 341 * netstack. */ 342 skb->pkt_type = 0; 343 __ieee80211_rx(local_to_hw(local), skb, &rx_status); 344 break; 345 case IEEE80211_TX_STATUS_MSG: 346 skb->pkt_type = 0; 347 ieee80211_tx_status(local_to_hw(local), skb); 348 break; 349 case IEEE80211_DELBA_MSG: 350 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 351 ieee80211_stop_tx_ba_cb(local_to_hw(local), 352 ra_tid->ra, ra_tid->tid); 353 dev_kfree_skb(skb); 354 break; 355 case IEEE80211_ADDBA_MSG: 356 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 357 ieee80211_start_tx_ba_cb(local_to_hw(local), 358 ra_tid->ra, ra_tid->tid); 359 dev_kfree_skb(skb); 360 break ; 361 default: 362 WARN(1, "mac80211: Packet is of unknown type %d\n", 363 skb->pkt_type); 364 dev_kfree_skb(skb); 365 break; 366 } 367 } 368} 369 370/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to 371 * make a prepared TX frame (one that has been given to hw) to look like brand 372 * new IEEE 802.11 frame that is ready to go through TX processing again. 373 */ 374static void ieee80211_remove_tx_extra(struct ieee80211_local *local, 375 struct ieee80211_key *key, 376 struct sk_buff *skb) 377{ 378 unsigned int hdrlen, iv_len, mic_len; 379 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 380 381 hdrlen = ieee80211_hdrlen(hdr->frame_control); 382 383 if (!key) 384 goto no_key; 385 386 switch (key->conf.alg) { 387 case ALG_WEP: 388 iv_len = WEP_IV_LEN; 389 mic_len = WEP_ICV_LEN; 390 break; 391 case ALG_TKIP: 392 iv_len = TKIP_IV_LEN; 393 mic_len = TKIP_ICV_LEN; 394 break; 395 case ALG_CCMP: 396 iv_len = CCMP_HDR_LEN; 397 mic_len = CCMP_MIC_LEN; 398 break; 399 default: 400 goto no_key; 401 } 402 403 if (skb->len >= hdrlen + mic_len && 404 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 405 skb_trim(skb, skb->len - mic_len); 406 if (skb->len >= hdrlen + iv_len) { 407 memmove(skb->data + iv_len, skb->data, hdrlen); 408 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len); 409 } 410 411no_key: 412 if (ieee80211_is_data_qos(hdr->frame_control)) { 413 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 414 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data, 415 hdrlen - IEEE80211_QOS_CTL_LEN); 416 skb_pull(skb, IEEE80211_QOS_CTL_LEN); 417 } 418} 419 420static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, 421 struct sta_info *sta, 422 struct sk_buff *skb) 423{ 424 sta->tx_filtered_count++; 425 426 /* 427 * Clear the TX filter mask for this STA when sending the next 428 * packet. If the STA went to power save mode, this will happen 429 * when it wakes up for the next time. 430 */ 431 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT); 432 433 /* 434 * This code races in the following way: 435 * 436 * (1) STA sends frame indicating it will go to sleep and does so 437 * (2) hardware/firmware adds STA to filter list, passes frame up 438 * (3) hardware/firmware processes TX fifo and suppresses a frame 439 * (4) we get TX status before having processed the frame and 440 * knowing that the STA has gone to sleep. 441 * 442 * This is actually quite unlikely even when both those events are 443 * processed from interrupts coming in quickly after one another or 444 * even at the same time because we queue both TX status events and 445 * RX frames to be processed by a tasklet and process them in the 446 * same order that they were received or TX status last. Hence, there 447 * is no race as long as the frame RX is processed before the next TX 448 * status, which drivers can ensure, see below. 449 * 450 * Note that this can only happen if the hardware or firmware can 451 * actually add STAs to the filter list, if this is done by the 452 * driver in response to set_tim() (which will only reduce the race 453 * this whole filtering tries to solve, not completely solve it) 454 * this situation cannot happen. 455 * 456 * To completely solve this race drivers need to make sure that they 457 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 458 * functions and 459 * (b) always process RX events before TX status events if ordering 460 * can be unknown, for example with different interrupt status 461 * bits. 462 */ 463 if (test_sta_flags(sta, WLAN_STA_PS) && 464 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) { 465 ieee80211_remove_tx_extra(local, sta->key, skb); 466 skb_queue_tail(&sta->tx_filtered, skb); 467 return; 468 } 469 470 if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) { 471 /* Software retry the packet once */ 472 skb->requeue = 1; 473 ieee80211_remove_tx_extra(local, sta->key, skb); 474 dev_queue_xmit(skb); 475 return; 476 } 477 478#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 479 if (net_ratelimit()) 480 printk(KERN_DEBUG "%s: dropped TX filtered frame, " 481 "queue_len=%d PS=%d @%lu\n", 482 wiphy_name(local->hw.wiphy), 483 skb_queue_len(&sta->tx_filtered), 484 !!test_sta_flags(sta, WLAN_STA_PS), jiffies); 485#endif 486 dev_kfree_skb(skb); 487} 488 489void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 490{ 491 struct sk_buff *skb2; 492 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 493 struct ieee80211_local *local = hw_to_local(hw); 494 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 495 u16 frag, type; 496 __le16 fc; 497 struct ieee80211_supported_band *sband; 498 struct ieee80211_tx_status_rtap_hdr *rthdr; 499 struct ieee80211_sub_if_data *sdata; 500 struct net_device *prev_dev = NULL; 501 struct sta_info *sta; 502 int retry_count = -1, i; 503 504 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 505 /* the HW cannot have attempted that rate */ 506 if (i >= hw->max_rates) { 507 info->status.rates[i].idx = -1; 508 info->status.rates[i].count = 0; 509 } 510 511 retry_count += info->status.rates[i].count; 512 } 513 if (retry_count < 0) 514 retry_count = 0; 515 516 rcu_read_lock(); 517 518 sband = local->hw.wiphy->bands[info->band]; 519 520 sta = sta_info_get(local, hdr->addr1); 521 522 if (sta) { 523 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 524 test_sta_flags(sta, WLAN_STA_PS)) { 525 /* 526 * The STA is in power save mode, so assume 527 * that this TX packet failed because of that. 528 */ 529 ieee80211_handle_filtered_frame(local, sta, skb); 530 rcu_read_unlock(); 531 return; 532 } 533 534 fc = hdr->frame_control; 535 536 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 537 (ieee80211_is_data_qos(fc))) { 538 u16 tid, ssn; 539 u8 *qc; 540 541 qc = ieee80211_get_qos_ctl(hdr); 542 tid = qc[0] & 0xf; 543 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 544 & IEEE80211_SCTL_SEQ); 545 ieee80211_send_bar(sta->sdata, hdr->addr1, 546 tid, ssn); 547 } 548 549 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 550 ieee80211_handle_filtered_frame(local, sta, skb); 551 rcu_read_unlock(); 552 return; 553 } else { 554 if (!(info->flags & IEEE80211_TX_STAT_ACK)) 555 sta->tx_retry_failed++; 556 sta->tx_retry_count += retry_count; 557 } 558 559 rate_control_tx_status(local, sband, sta, skb); 560 } 561 562 rcu_read_unlock(); 563 564 ieee80211_led_tx(local, 0); 565 566 /* SNMP counters 567 * Fragments are passed to low-level drivers as separate skbs, so these 568 * are actually fragments, not frames. Update frame counters only for 569 * the first fragment of the frame. */ 570 571 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG; 572 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE; 573 574 if (info->flags & IEEE80211_TX_STAT_ACK) { 575 if (frag == 0) { 576 local->dot11TransmittedFrameCount++; 577 if (is_multicast_ether_addr(hdr->addr1)) 578 local->dot11MulticastTransmittedFrameCount++; 579 if (retry_count > 0) 580 local->dot11RetryCount++; 581 if (retry_count > 1) 582 local->dot11MultipleRetryCount++; 583 } 584 585 /* This counter shall be incremented for an acknowledged MPDU 586 * with an individual address in the address 1 field or an MPDU 587 * with a multicast address in the address 1 field of type Data 588 * or Management. */ 589 if (!is_multicast_ether_addr(hdr->addr1) || 590 type == IEEE80211_FTYPE_DATA || 591 type == IEEE80211_FTYPE_MGMT) 592 local->dot11TransmittedFragmentCount++; 593 } else { 594 if (frag == 0) 595 local->dot11FailedCount++; 596 } 597 598 /* this was a transmitted frame, but now we want to reuse it */ 599 skb_orphan(skb); 600 601 /* 602 * This is a bit racy but we can avoid a lot of work 603 * with this test... 604 */ 605 if (!local->monitors && !local->cooked_mntrs) { 606 dev_kfree_skb(skb); 607 return; 608 } 609 610 /* send frame to monitor interfaces now */ 611 612 if (skb_headroom(skb) < sizeof(*rthdr)) { 613 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n"); 614 dev_kfree_skb(skb); 615 return; 616 } 617 618 rthdr = (struct ieee80211_tx_status_rtap_hdr *) 619 skb_push(skb, sizeof(*rthdr)); 620 621 memset(rthdr, 0, sizeof(*rthdr)); 622 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); 623 rthdr->hdr.it_present = 624 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 625 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) | 626 (1 << IEEE80211_RADIOTAP_RATE)); 627 628 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 629 !is_multicast_ether_addr(hdr->addr1)) 630 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL); 631 632 /* 633 * XXX: Once radiotap gets the bitmap reset thing the vendor 634 * extensions proposal contains, we can actually report 635 * the whole set of tries we did. 636 */ 637 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || 638 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) 639 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS); 640 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 641 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS); 642 if (info->status.rates[0].idx >= 0 && 643 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) 644 rthdr->rate = sband->bitrates[ 645 info->status.rates[0].idx].bitrate / 5; 646 647 /* for now report the total retry_count */ 648 rthdr->data_retries = retry_count; 649 650 /* XXX: is this sufficient for BPF? */ 651 skb_set_mac_header(skb, 0); 652 skb->ip_summed = CHECKSUM_UNNECESSARY; 653 skb->pkt_type = PACKET_OTHERHOST; 654 skb->protocol = htons(ETH_P_802_2); 655 memset(skb->cb, 0, sizeof(skb->cb)); 656 657 rcu_read_lock(); 658 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 659 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 660 if (!netif_running(sdata->dev)) 661 continue; 662 663 if (prev_dev) { 664 skb2 = skb_clone(skb, GFP_ATOMIC); 665 if (skb2) { 666 skb2->dev = prev_dev; 667 netif_rx(skb2); 668 } 669 } 670 671 prev_dev = sdata->dev; 672 } 673 } 674 if (prev_dev) { 675 skb->dev = prev_dev; 676 netif_rx(skb); 677 skb = NULL; 678 } 679 rcu_read_unlock(); 680 dev_kfree_skb(skb); 681} 682EXPORT_SYMBOL(ieee80211_tx_status); 683 684static void ieee80211_restart_work(struct work_struct *work) 685{ 686 struct ieee80211_local *local = 687 container_of(work, struct ieee80211_local, restart_work); 688 689 rtnl_lock(); 690 ieee80211_reconfig(local); 691 rtnl_unlock(); 692} 693 694void ieee80211_restart_hw(struct ieee80211_hw *hw) 695{ 696 struct ieee80211_local *local = hw_to_local(hw); 697 698 /* use this reason, __ieee80211_resume will unblock it */ 699 ieee80211_stop_queues_by_reason(hw, 700 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 701 702 schedule_work(&local->restart_work); 703} 704EXPORT_SYMBOL(ieee80211_restart_hw); 705 706struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 707 const struct ieee80211_ops *ops) 708{ 709 struct ieee80211_local *local; 710 int priv_size, i; 711 struct wiphy *wiphy; 712 713 /* Ensure 32-byte alignment of our private data and hw private data. 714 * We use the wiphy priv data for both our ieee80211_local and for 715 * the driver's private data 716 * 717 * In memory it'll be like this: 718 * 719 * +-------------------------+ 720 * | struct wiphy | 721 * +-------------------------+ 722 * | struct ieee80211_local | 723 * +-------------------------+ 724 * | driver's private data | 725 * +-------------------------+ 726 * 727 */ 728 priv_size = ((sizeof(struct ieee80211_local) + 729 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) + 730 priv_data_len; 731 732 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 733 734 if (!wiphy) 735 return NULL; 736 737 wiphy->privid = mac80211_wiphy_privid; 738 739 /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */ 740 wiphy->bss_priv_size = sizeof(struct ieee80211_bss) - 741 sizeof(struct cfg80211_bss); 742 743 local = wiphy_priv(wiphy); 744 745 local->hw.wiphy = wiphy; 746 747 local->hw.priv = (char *)local + 748 ((sizeof(struct ieee80211_local) + 749 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST); 750 751 BUG_ON(!ops->tx); 752 BUG_ON(!ops->start); 753 BUG_ON(!ops->stop); 754 BUG_ON(!ops->config); 755 BUG_ON(!ops->add_interface); 756 BUG_ON(!ops->remove_interface); 757 BUG_ON(!ops->configure_filter); 758 local->ops = ops; 759 760 /* set up some defaults */ 761 local->hw.queues = 1; 762 local->hw.max_rates = 1; 763 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; 764 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; 765 local->hw.conf.radio_enabled = true; 766 local->user_power_level = -1; 767 768 INIT_LIST_HEAD(&local->interfaces); 769 mutex_init(&local->iflist_mtx); 770 mutex_init(&local->scan_mtx); 771 772 spin_lock_init(&local->key_lock); 773 774 spin_lock_init(&local->queue_stop_reason_lock); 775 776 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 777 778 INIT_WORK(&local->restart_work, ieee80211_restart_work); 779 780 INIT_WORK(&local->dynamic_ps_enable_work, 781 ieee80211_dynamic_ps_enable_work); 782 INIT_WORK(&local->dynamic_ps_disable_work, 783 ieee80211_dynamic_ps_disable_work); 784 setup_timer(&local->dynamic_ps_timer, 785 ieee80211_dynamic_ps_timer, (unsigned long) local); 786 787 sta_info_init(local); 788 789 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) 790 skb_queue_head_init(&local->pending[i]); 791 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 792 (unsigned long)local); 793 tasklet_disable(&local->tx_pending_tasklet); 794 795 tasklet_init(&local->tasklet, 796 ieee80211_tasklet_handler, 797 (unsigned long) local); 798 tasklet_disable(&local->tasklet); 799 800 skb_queue_head_init(&local->skb_queue); 801 skb_queue_head_init(&local->skb_queue_unreliable); 802 803 spin_lock_init(&local->ampdu_lock); 804 805 return local_to_hw(local); 806} 807EXPORT_SYMBOL(ieee80211_alloc_hw); 808 809static const struct net_device_ops ieee80211_master_ops = { 810 .ndo_start_xmit = ieee80211_master_start_xmit, 811 .ndo_open = ieee80211_master_open, 812 .ndo_stop = ieee80211_master_stop, 813 .ndo_set_multicast_list = ieee80211_master_set_multicast_list, 814 .ndo_select_queue = ieee80211_select_queue, 815}; 816 817static void ieee80211_master_setup(struct net_device *mdev) 818{ 819 mdev->type = ARPHRD_IEEE80211; 820 mdev->netdev_ops = &ieee80211_master_ops; 821 mdev->header_ops = &ieee80211_header_ops; 822 mdev->tx_queue_len = 1000; 823 mdev->addr_len = ETH_ALEN; 824} 825 826int ieee80211_register_hw(struct ieee80211_hw *hw) 827{ 828 struct ieee80211_local *local = hw_to_local(hw); 829 int result; 830 enum ieee80211_band band; 831 struct net_device *mdev; 832 struct ieee80211_master_priv *mpriv; 833 int channels, i, j, max_bitrates; 834 bool supp_ht; 835 static const u32 cipher_suites[] = { 836 WLAN_CIPHER_SUITE_WEP40, 837 WLAN_CIPHER_SUITE_WEP104, 838 WLAN_CIPHER_SUITE_TKIP, 839 WLAN_CIPHER_SUITE_CCMP, 840 841 /* keep last -- depends on hw flags! */ 842 WLAN_CIPHER_SUITE_AES_CMAC 843 }; 844 845 /* 846 * generic code guarantees at least one band, 847 * set this very early because much code assumes 848 * that hw.conf.channel is assigned 849 */ 850 channels = 0; 851 max_bitrates = 0; 852 supp_ht = false; 853 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 854 struct ieee80211_supported_band *sband; 855 856 sband = local->hw.wiphy->bands[band]; 857 if (!sband) 858 continue; 859 if (!local->oper_channel) { 860 /* init channel we're on */ 861 local->hw.conf.channel = 862 local->oper_channel = 863 local->scan_channel = &sband->channels[0]; 864 } 865 channels += sband->n_channels; 866 867 if (max_bitrates < sband->n_bitrates) 868 max_bitrates = sband->n_bitrates; 869 supp_ht = supp_ht || sband->ht_cap.ht_supported; 870 } 871 872 local->int_scan_req.n_channels = channels; 873 local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL); 874 if (!local->int_scan_req.channels) 875 return -ENOMEM; 876 877 /* if low-level driver supports AP, we also support VLAN */ 878 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) 879 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 880 881 /* mac80211 always supports monitor */ 882 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 883 884 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 885 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; 886 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 887 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; 888 889 /* 890 * Calculate scan IE length -- we need this to alloc 891 * memory and to subtract from the driver limit. It 892 * includes the (extended) supported rates and HT 893 * information -- SSID is the driver's responsibility. 894 */ 895 local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */ 896 if (supp_ht) 897 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); 898 899 if (!local->ops->hw_scan) { 900 /* For hw_scan, driver needs to set these up. */ 901 local->hw.wiphy->max_scan_ssids = 4; 902 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; 903 } 904 905 /* 906 * If the driver supports any scan IEs, then assume the 907 * limit includes the IEs mac80211 will add, otherwise 908 * leave it at zero and let the driver sort it out; we 909 * still pass our IEs to the driver but userspace will 910 * not be allowed to in that case. 911 */ 912 if (local->hw.wiphy->max_scan_ie_len) 913 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; 914 915 local->hw.wiphy->cipher_suites = cipher_suites; 916 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); 917 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) 918 local->hw.wiphy->n_cipher_suites--; 919 920 result = wiphy_register(local->hw.wiphy); 921 if (result < 0) 922 goto fail_wiphy_register; 923 924 /* 925 * We use the number of queues for feature tests (QoS, HT) internally 926 * so restrict them appropriately. 927 */ 928 if (hw->queues > IEEE80211_MAX_QUEUES) 929 hw->queues = IEEE80211_MAX_QUEUES; 930 931 mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv), 932 "wmaster%d", ieee80211_master_setup, 933 hw->queues); 934 if (!mdev) 935 goto fail_mdev_alloc; 936 937 mpriv = netdev_priv(mdev); 938 mpriv->local = local; 939 local->mdev = mdev; 940 941 local->hw.workqueue = 942 create_singlethread_workqueue(wiphy_name(local->hw.wiphy)); 943 if (!local->hw.workqueue) { 944 result = -ENOMEM; 945 goto fail_workqueue; 946 } 947 948 /* 949 * The hardware needs headroom for sending the frame, 950 * and we need some headroom for passing the frame to monitor 951 * interfaces, but never both at the same time. 952 */ 953 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 954 sizeof(struct ieee80211_tx_status_rtap_hdr)); 955 956 debugfs_hw_add(local); 957 958 if (local->hw.max_listen_interval == 0) 959 local->hw.max_listen_interval = 1; 960 961 local->hw.conf.listen_interval = local->hw.max_listen_interval; 962 963 result = sta_info_start(local); 964 if (result < 0) 965 goto fail_sta_info; 966 967 result = ieee80211_wep_init(local); 968 if (result < 0) { 969 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n", 970 wiphy_name(local->hw.wiphy), result); 971 goto fail_wep; 972 } 973 974 rtnl_lock(); 975 result = dev_alloc_name(local->mdev, local->mdev->name); 976 if (result < 0) 977 goto fail_dev; 978 979 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 980 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy)); 981 local->mdev->features |= NETIF_F_NETNS_LOCAL; 982 983 result = register_netdevice(local->mdev); 984 if (result < 0) 985 goto fail_dev; 986 987 result = ieee80211_init_rate_ctrl_alg(local, 988 hw->rate_control_algorithm); 989 if (result < 0) { 990 printk(KERN_DEBUG "%s: Failed to initialize rate control " 991 "algorithm\n", wiphy_name(local->hw.wiphy)); 992 goto fail_rate; 993 } 994 995 /* add one default STA interface if supported */ 996 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 997 result = ieee80211_if_add(local, "wlan%d", NULL, 998 NL80211_IFTYPE_STATION, NULL); 999 if (result) 1000 printk(KERN_WARNING "%s: Failed to add default virtual iface\n", 1001 wiphy_name(local->hw.wiphy)); 1002 } 1003 1004 rtnl_unlock(); 1005 1006 ieee80211_led_init(local); 1007 1008 /* alloc internal scan request */ 1009 i = 0; 1010 local->int_scan_req.ssids = &local->scan_ssid; 1011 local->int_scan_req.n_ssids = 1; 1012 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 1013 if (!hw->wiphy->bands[band]) 1014 continue; 1015 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) { 1016 local->int_scan_req.channels[i] = 1017 &hw->wiphy->bands[band]->channels[j]; 1018 i++; 1019 } 1020 } 1021 1022 local->network_latency_notifier.notifier_call = 1023 ieee80211_max_network_latency; 1024 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, 1025 &local->network_latency_notifier); 1026 1027 if (result) { 1028 rtnl_lock(); 1029 goto fail_pm_qos; 1030 } 1031 1032 return 0; 1033 1034 fail_pm_qos: 1035 ieee80211_led_exit(local); 1036 ieee80211_remove_interfaces(local); 1037 fail_rate: 1038 unregister_netdevice(local->mdev); 1039 local->mdev = NULL; 1040 fail_dev: 1041 rtnl_unlock(); 1042 ieee80211_wep_free(local); 1043 fail_wep: 1044 sta_info_stop(local); 1045 fail_sta_info: 1046 debugfs_hw_del(local); 1047 destroy_workqueue(local->hw.workqueue); 1048 fail_workqueue: 1049 if (local->mdev) 1050 free_netdev(local->mdev); 1051 fail_mdev_alloc: 1052 wiphy_unregister(local->hw.wiphy); 1053 fail_wiphy_register: 1054 kfree(local->int_scan_req.channels); 1055 return result; 1056} 1057EXPORT_SYMBOL(ieee80211_register_hw); 1058 1059void ieee80211_unregister_hw(struct ieee80211_hw *hw) 1060{ 1061 struct ieee80211_local *local = hw_to_local(hw); 1062 1063 tasklet_kill(&local->tx_pending_tasklet); 1064 tasklet_kill(&local->tasklet); 1065 1066 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 1067 &local->network_latency_notifier); 1068 1069 rtnl_lock(); 1070 1071 /* 1072 * At this point, interface list manipulations are fine 1073 * because the driver cannot be handing us frames any 1074 * more and the tasklet is killed. 1075 */ 1076 1077 /* First, we remove all virtual interfaces. */ 1078 ieee80211_remove_interfaces(local); 1079 1080 /* then, finally, remove the master interface */ 1081 unregister_netdevice(local->mdev); 1082 1083 rtnl_unlock(); 1084 1085 ieee80211_clear_tx_pending(local); 1086 sta_info_stop(local); 1087 rate_control_deinitialize(local); 1088 debugfs_hw_del(local); 1089 1090 if (skb_queue_len(&local->skb_queue) 1091 || skb_queue_len(&local->skb_queue_unreliable)) 1092 printk(KERN_WARNING "%s: skb_queue not empty\n", 1093 wiphy_name(local->hw.wiphy)); 1094 skb_queue_purge(&local->skb_queue); 1095 skb_queue_purge(&local->skb_queue_unreliable); 1096 1097 destroy_workqueue(local->hw.workqueue); 1098 wiphy_unregister(local->hw.wiphy); 1099 ieee80211_wep_free(local); 1100 ieee80211_led_exit(local); 1101 free_netdev(local->mdev); 1102 kfree(local->int_scan_req.channels); 1103} 1104EXPORT_SYMBOL(ieee80211_unregister_hw); 1105 1106void ieee80211_free_hw(struct ieee80211_hw *hw) 1107{ 1108 struct ieee80211_local *local = hw_to_local(hw); 1109 1110 mutex_destroy(&local->iflist_mtx); 1111 mutex_destroy(&local->scan_mtx); 1112 1113 wiphy_free(local->hw.wiphy); 1114} 1115EXPORT_SYMBOL(ieee80211_free_hw); 1116 1117static int __init ieee80211_init(void) 1118{ 1119 struct sk_buff *skb; 1120 int ret; 1121 1122 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1123 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1124 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1125 1126 ret = rc80211_minstrel_init(); 1127 if (ret) 1128 return ret; 1129 1130 ret = rc80211_pid_init(); 1131 if (ret) 1132 return ret; 1133 1134 ieee80211_debugfs_netdev_init(); 1135 1136 return 0; 1137} 1138 1139static void __exit ieee80211_exit(void) 1140{ 1141 rc80211_pid_exit(); 1142 rc80211_minstrel_exit(); 1143 1144 /* 1145 * For key todo, it'll be empty by now but the work 1146 * might still be scheduled. 1147 */ 1148 flush_scheduled_work(); 1149 1150 if (mesh_allocated) 1151 ieee80211s_stop(); 1152 1153 ieee80211_debugfs_netdev_exit(); 1154} 1155 1156 1157subsys_initcall(ieee80211_init); 1158module_exit(ieee80211_exit); 1159 1160MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1161MODULE_LICENSE("GPL"); 1162