main.c revision 4ada424db196c78746fec255d493cacb1c9feddf
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 conf.changed = changed; 172 173 if (sdata->vif.type == NL80211_IFTYPE_STATION || 174 sdata->vif.type == NL80211_IFTYPE_ADHOC) 175 conf.bssid = sdata->u.sta.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 u8 zero[ETH_ALEN] = { 0 }; 180 conf.bssid = zero; 181 } else { 182 WARN_ON(1); 183 return -EINVAL; 184 } 185 186 if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID))) 187 return -EINVAL; 188 189 return local->ops->config_interface(local_to_hw(local), 190 &sdata->vif, &conf); 191} 192 193int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 194{ 195 struct ieee80211_channel *chan; 196 int ret = 0; 197 int power; 198 199 might_sleep(); 200 201 if (local->sw_scanning) 202 chan = local->scan_channel; 203 else 204 chan = local->oper_channel; 205 206 if (chan != local->hw.conf.channel) { 207 local->hw.conf.channel = chan; 208 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 209 } 210 211 212 if (!local->hw.conf.power_level) 213 power = chan->max_power; 214 else 215 power = min(chan->max_power, local->hw.conf.power_level); 216 if (local->hw.conf.power_level != power) { 217 changed |= IEEE80211_CONF_CHANGE_POWER; 218 local->hw.conf.power_level = power; 219 } 220 221 if (changed && local->open_count) { 222 ret = local->ops->config(local_to_hw(local), changed); 223 /* 224 * HW reconfiguration should never fail, the driver has told 225 * us what it can support so it should live up to that promise. 226 */ 227 WARN_ON(ret); 228 } 229 230 return ret; 231} 232 233void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 234 u32 changed) 235{ 236 struct ieee80211_local *local = sdata->local; 237 238 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 239 return; 240 241 if (!changed) 242 return; 243 244 if (local->ops->bss_info_changed) 245 local->ops->bss_info_changed(local_to_hw(local), 246 &sdata->vif, 247 &sdata->vif.bss_conf, 248 changed); 249} 250 251u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 252{ 253 sdata->vif.bss_conf.use_cts_prot = false; 254 sdata->vif.bss_conf.use_short_preamble = false; 255 sdata->vif.bss_conf.use_short_slot = false; 256 return BSS_CHANGED_ERP_CTS_PROT | 257 BSS_CHANGED_ERP_PREAMBLE | 258 BSS_CHANGED_ERP_SLOT; 259} 260 261void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, 262 struct sk_buff *skb) 263{ 264 struct ieee80211_local *local = hw_to_local(hw); 265 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 266 int tmp; 267 268 skb->dev = local->mdev; 269 skb->pkt_type = IEEE80211_TX_STATUS_MSG; 270 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ? 271 &local->skb_queue : &local->skb_queue_unreliable, skb); 272 tmp = skb_queue_len(&local->skb_queue) + 273 skb_queue_len(&local->skb_queue_unreliable); 274 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && 275 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 276 dev_kfree_skb_irq(skb); 277 tmp--; 278 I802_DEBUG_INC(local->tx_status_drop); 279 } 280 tasklet_schedule(&local->tasklet); 281} 282EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); 283 284static void ieee80211_tasklet_handler(unsigned long data) 285{ 286 struct ieee80211_local *local = (struct ieee80211_local *) data; 287 struct sk_buff *skb; 288 struct ieee80211_rx_status rx_status; 289 struct ieee80211_ra_tid *ra_tid; 290 291 while ((skb = skb_dequeue(&local->skb_queue)) || 292 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 293 switch (skb->pkt_type) { 294 case IEEE80211_RX_MSG: 295 /* status is in skb->cb */ 296 memcpy(&rx_status, skb->cb, sizeof(rx_status)); 297 /* Clear skb->pkt_type in order to not confuse kernel 298 * netstack. */ 299 skb->pkt_type = 0; 300 __ieee80211_rx(local_to_hw(local), skb, &rx_status); 301 break; 302 case IEEE80211_TX_STATUS_MSG: 303 skb->pkt_type = 0; 304 ieee80211_tx_status(local_to_hw(local), skb); 305 break; 306 case IEEE80211_DELBA_MSG: 307 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 308 ieee80211_stop_tx_ba_cb(local_to_hw(local), 309 ra_tid->ra, ra_tid->tid); 310 dev_kfree_skb(skb); 311 break; 312 case IEEE80211_ADDBA_MSG: 313 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 314 ieee80211_start_tx_ba_cb(local_to_hw(local), 315 ra_tid->ra, ra_tid->tid); 316 dev_kfree_skb(skb); 317 break ; 318 default: 319 WARN_ON(1); 320 dev_kfree_skb(skb); 321 break; 322 } 323 } 324} 325 326/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to 327 * make a prepared TX frame (one that has been given to hw) to look like brand 328 * new IEEE 802.11 frame that is ready to go through TX processing again. 329 */ 330static void ieee80211_remove_tx_extra(struct ieee80211_local *local, 331 struct ieee80211_key *key, 332 struct sk_buff *skb) 333{ 334 unsigned int hdrlen, iv_len, mic_len; 335 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 336 337 hdrlen = ieee80211_hdrlen(hdr->frame_control); 338 339 if (!key) 340 goto no_key; 341 342 switch (key->conf.alg) { 343 case ALG_WEP: 344 iv_len = WEP_IV_LEN; 345 mic_len = WEP_ICV_LEN; 346 break; 347 case ALG_TKIP: 348 iv_len = TKIP_IV_LEN; 349 mic_len = TKIP_ICV_LEN; 350 break; 351 case ALG_CCMP: 352 iv_len = CCMP_HDR_LEN; 353 mic_len = CCMP_MIC_LEN; 354 break; 355 default: 356 goto no_key; 357 } 358 359 if (skb->len >= hdrlen + mic_len && 360 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 361 skb_trim(skb, skb->len - mic_len); 362 if (skb->len >= hdrlen + iv_len) { 363 memmove(skb->data + iv_len, skb->data, hdrlen); 364 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len); 365 } 366 367no_key: 368 if (ieee80211_is_data_qos(hdr->frame_control)) { 369 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 370 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data, 371 hdrlen - IEEE80211_QOS_CTL_LEN); 372 skb_pull(skb, IEEE80211_QOS_CTL_LEN); 373 } 374} 375 376static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, 377 struct sta_info *sta, 378 struct sk_buff *skb) 379{ 380 sta->tx_filtered_count++; 381 382 /* 383 * Clear the TX filter mask for this STA when sending the next 384 * packet. If the STA went to power save mode, this will happen 385 * when it wakes up for the next time. 386 */ 387 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT); 388 389 /* 390 * This code races in the following way: 391 * 392 * (1) STA sends frame indicating it will go to sleep and does so 393 * (2) hardware/firmware adds STA to filter list, passes frame up 394 * (3) hardware/firmware processes TX fifo and suppresses a frame 395 * (4) we get TX status before having processed the frame and 396 * knowing that the STA has gone to sleep. 397 * 398 * This is actually quite unlikely even when both those events are 399 * processed from interrupts coming in quickly after one another or 400 * even at the same time because we queue both TX status events and 401 * RX frames to be processed by a tasklet and process them in the 402 * same order that they were received or TX status last. Hence, there 403 * is no race as long as the frame RX is processed before the next TX 404 * status, which drivers can ensure, see below. 405 * 406 * Note that this can only happen if the hardware or firmware can 407 * actually add STAs to the filter list, if this is done by the 408 * driver in response to set_tim() (which will only reduce the race 409 * this whole filtering tries to solve, not completely solve it) 410 * this situation cannot happen. 411 * 412 * To completely solve this race drivers need to make sure that they 413 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 414 * functions and 415 * (b) always process RX events before TX status events if ordering 416 * can be unknown, for example with different interrupt status 417 * bits. 418 */ 419 if (test_sta_flags(sta, WLAN_STA_PS) && 420 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) { 421 ieee80211_remove_tx_extra(local, sta->key, skb); 422 skb_queue_tail(&sta->tx_filtered, skb); 423 return; 424 } 425 426 if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) { 427 /* Software retry the packet once */ 428 skb->requeue = 1; 429 ieee80211_remove_tx_extra(local, sta->key, skb); 430 dev_queue_xmit(skb); 431 return; 432 } 433 434#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 435 if (net_ratelimit()) 436 printk(KERN_DEBUG "%s: dropped TX filtered frame, " 437 "queue_len=%d PS=%d @%lu\n", 438 wiphy_name(local->hw.wiphy), 439 skb_queue_len(&sta->tx_filtered), 440 !!test_sta_flags(sta, WLAN_STA_PS), jiffies); 441#endif 442 dev_kfree_skb(skb); 443} 444 445void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 446{ 447 struct sk_buff *skb2; 448 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 449 struct ieee80211_local *local = hw_to_local(hw); 450 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 451 u16 frag, type; 452 __le16 fc; 453 struct ieee80211_supported_band *sband; 454 struct ieee80211_tx_status_rtap_hdr *rthdr; 455 struct ieee80211_sub_if_data *sdata; 456 struct net_device *prev_dev = NULL; 457 struct sta_info *sta; 458 int retry_count = -1, i; 459 460 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 461 /* the HW cannot have attempted that rate */ 462 if (i >= hw->max_rates) { 463 info->status.rates[i].idx = -1; 464 info->status.rates[i].count = 0; 465 } 466 467 retry_count += info->status.rates[i].count; 468 } 469 if (retry_count < 0) 470 retry_count = 0; 471 472 rcu_read_lock(); 473 474 sband = local->hw.wiphy->bands[info->band]; 475 476 sta = sta_info_get(local, hdr->addr1); 477 478 if (sta) { 479 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 480 test_sta_flags(sta, WLAN_STA_PS)) { 481 /* 482 * The STA is in power save mode, so assume 483 * that this TX packet failed because of that. 484 */ 485 ieee80211_handle_filtered_frame(local, sta, skb); 486 rcu_read_unlock(); 487 return; 488 } 489 490 fc = hdr->frame_control; 491 492 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 493 (ieee80211_is_data_qos(fc))) { 494 u16 tid, ssn; 495 u8 *qc; 496 497 qc = ieee80211_get_qos_ctl(hdr); 498 tid = qc[0] & 0xf; 499 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 500 & IEEE80211_SCTL_SEQ); 501 ieee80211_send_bar(sta->sdata, hdr->addr1, 502 tid, ssn); 503 } 504 505 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 506 ieee80211_handle_filtered_frame(local, sta, skb); 507 rcu_read_unlock(); 508 return; 509 } else { 510 if (!(info->flags & IEEE80211_TX_STAT_ACK)) 511 sta->tx_retry_failed++; 512 sta->tx_retry_count += retry_count; 513 } 514 515 rate_control_tx_status(local, sband, sta, skb); 516 } 517 518 rcu_read_unlock(); 519 520 ieee80211_led_tx(local, 0); 521 522 /* SNMP counters 523 * Fragments are passed to low-level drivers as separate skbs, so these 524 * are actually fragments, not frames. Update frame counters only for 525 * the first fragment of the frame. */ 526 527 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG; 528 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE; 529 530 if (info->flags & IEEE80211_TX_STAT_ACK) { 531 if (frag == 0) { 532 local->dot11TransmittedFrameCount++; 533 if (is_multicast_ether_addr(hdr->addr1)) 534 local->dot11MulticastTransmittedFrameCount++; 535 if (retry_count > 0) 536 local->dot11RetryCount++; 537 if (retry_count > 1) 538 local->dot11MultipleRetryCount++; 539 } 540 541 /* This counter shall be incremented for an acknowledged MPDU 542 * with an individual address in the address 1 field or an MPDU 543 * with a multicast address in the address 1 field of type Data 544 * or Management. */ 545 if (!is_multicast_ether_addr(hdr->addr1) || 546 type == IEEE80211_FTYPE_DATA || 547 type == IEEE80211_FTYPE_MGMT) 548 local->dot11TransmittedFragmentCount++; 549 } else { 550 if (frag == 0) 551 local->dot11FailedCount++; 552 } 553 554 /* this was a transmitted frame, but now we want to reuse it */ 555 skb_orphan(skb); 556 557 /* 558 * This is a bit racy but we can avoid a lot of work 559 * with this test... 560 */ 561 if (!local->monitors && !local->cooked_mntrs) { 562 dev_kfree_skb(skb); 563 return; 564 } 565 566 /* send frame to monitor interfaces now */ 567 568 if (skb_headroom(skb) < sizeof(*rthdr)) { 569 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n"); 570 dev_kfree_skb(skb); 571 return; 572 } 573 574 rthdr = (struct ieee80211_tx_status_rtap_hdr *) 575 skb_push(skb, sizeof(*rthdr)); 576 577 memset(rthdr, 0, sizeof(*rthdr)); 578 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); 579 rthdr->hdr.it_present = 580 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 581 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) | 582 (1 << IEEE80211_RADIOTAP_RATE)); 583 584 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 585 !is_multicast_ether_addr(hdr->addr1)) 586 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL); 587 588 /* 589 * XXX: Once radiotap gets the bitmap reset thing the vendor 590 * extensions proposal contains, we can actually report 591 * the whole set of tries we did. 592 */ 593 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || 594 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) 595 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS); 596 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 597 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS); 598 if (info->status.rates[0].idx >= 0 && 599 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) 600 rthdr->rate = sband->bitrates[ 601 info->status.rates[0].idx].bitrate / 5; 602 603 /* for now report the total retry_count */ 604 rthdr->data_retries = retry_count; 605 606 /* XXX: is this sufficient for BPF? */ 607 skb_set_mac_header(skb, 0); 608 skb->ip_summed = CHECKSUM_UNNECESSARY; 609 skb->pkt_type = PACKET_OTHERHOST; 610 skb->protocol = htons(ETH_P_802_2); 611 memset(skb->cb, 0, sizeof(skb->cb)); 612 613 rcu_read_lock(); 614 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 615 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 616 if (!netif_running(sdata->dev)) 617 continue; 618 619 if (prev_dev) { 620 skb2 = skb_clone(skb, GFP_ATOMIC); 621 if (skb2) { 622 skb2->dev = prev_dev; 623 netif_rx(skb2); 624 } 625 } 626 627 prev_dev = sdata->dev; 628 } 629 } 630 if (prev_dev) { 631 skb->dev = prev_dev; 632 netif_rx(skb); 633 skb = NULL; 634 } 635 rcu_read_unlock(); 636 dev_kfree_skb(skb); 637} 638EXPORT_SYMBOL(ieee80211_tx_status); 639 640struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 641 const struct ieee80211_ops *ops) 642{ 643 struct ieee80211_local *local; 644 int priv_size; 645 struct wiphy *wiphy; 646 647 /* Ensure 32-byte alignment of our private data and hw private data. 648 * We use the wiphy priv data for both our ieee80211_local and for 649 * the driver's private data 650 * 651 * In memory it'll be like this: 652 * 653 * +-------------------------+ 654 * | struct wiphy | 655 * +-------------------------+ 656 * | struct ieee80211_local | 657 * +-------------------------+ 658 * | driver's private data | 659 * +-------------------------+ 660 * 661 */ 662 priv_size = ((sizeof(struct ieee80211_local) + 663 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) + 664 priv_data_len; 665 666 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 667 668 if (!wiphy) 669 return NULL; 670 671 wiphy->privid = mac80211_wiphy_privid; 672 673 local = wiphy_priv(wiphy); 674 local->hw.wiphy = wiphy; 675 676 local->hw.priv = (char *)local + 677 ((sizeof(struct ieee80211_local) + 678 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST); 679 680 BUG_ON(!ops->tx); 681 BUG_ON(!ops->start); 682 BUG_ON(!ops->stop); 683 BUG_ON(!ops->config); 684 BUG_ON(!ops->add_interface); 685 BUG_ON(!ops->remove_interface); 686 BUG_ON(!ops->configure_filter); 687 local->ops = ops; 688 689 /* set up some defaults */ 690 local->hw.queues = 1; 691 local->hw.max_rates = 1; 692 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD; 693 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD; 694 local->hw.conf.long_frame_max_tx_count = 4; 695 local->hw.conf.short_frame_max_tx_count = 7; 696 local->hw.conf.radio_enabled = true; 697 698 INIT_LIST_HEAD(&local->interfaces); 699 700 spin_lock_init(&local->key_lock); 701 702 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 703 704 sta_info_init(local); 705 706 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 707 (unsigned long)local); 708 tasklet_disable(&local->tx_pending_tasklet); 709 710 tasklet_init(&local->tasklet, 711 ieee80211_tasklet_handler, 712 (unsigned long) local); 713 tasklet_disable(&local->tasklet); 714 715 skb_queue_head_init(&local->skb_queue); 716 skb_queue_head_init(&local->skb_queue_unreliable); 717 718 return local_to_hw(local); 719} 720EXPORT_SYMBOL(ieee80211_alloc_hw); 721 722int ieee80211_register_hw(struct ieee80211_hw *hw) 723{ 724 struct ieee80211_local *local = hw_to_local(hw); 725 int result; 726 enum ieee80211_band band; 727 struct net_device *mdev; 728 struct ieee80211_master_priv *mpriv; 729 730 /* 731 * generic code guarantees at least one band, 732 * set this very early because much code assumes 733 * that hw.conf.channel is assigned 734 */ 735 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 736 struct ieee80211_supported_band *sband; 737 738 sband = local->hw.wiphy->bands[band]; 739 if (sband) { 740 /* init channel we're on */ 741 local->hw.conf.channel = 742 local->oper_channel = 743 local->scan_channel = &sband->channels[0]; 744 break; 745 } 746 } 747 748 /* if low-level driver supports AP, we also support VLAN */ 749 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) 750 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 751 752 /* mac80211 always supports monitor */ 753 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 754 755 result = wiphy_register(local->hw.wiphy); 756 if (result < 0) 757 return result; 758 759 /* 760 * We use the number of queues for feature tests (QoS, HT) internally 761 * so restrict them appropriately. 762 */ 763 if (hw->queues > IEEE80211_MAX_QUEUES) 764 hw->queues = IEEE80211_MAX_QUEUES; 765 if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES) 766 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES; 767 if (hw->queues < 4) 768 hw->ampdu_queues = 0; 769 770 mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv), 771 "wmaster%d", ether_setup, 772 ieee80211_num_queues(hw)); 773 if (!mdev) 774 goto fail_mdev_alloc; 775 776 mpriv = netdev_priv(mdev); 777 mpriv->local = local; 778 local->mdev = mdev; 779 780 ieee80211_rx_bss_list_init(local); 781 782 mdev->hard_start_xmit = ieee80211_master_start_xmit; 783 mdev->open = ieee80211_master_open; 784 mdev->stop = ieee80211_master_stop; 785 mdev->type = ARPHRD_IEEE80211; 786 mdev->header_ops = &ieee80211_header_ops; 787 mdev->set_multicast_list = ieee80211_master_set_multicast_list; 788 789 local->hw.workqueue = 790 create_freezeable_workqueue(wiphy_name(local->hw.wiphy)); 791 if (!local->hw.workqueue) { 792 result = -ENOMEM; 793 goto fail_workqueue; 794 } 795 796 /* 797 * The hardware needs headroom for sending the frame, 798 * and we need some headroom for passing the frame to monitor 799 * interfaces, but never both at the same time. 800 */ 801 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 802 sizeof(struct ieee80211_tx_status_rtap_hdr)); 803 804 debugfs_hw_add(local); 805 806 if (local->hw.conf.beacon_int < 10) 807 local->hw.conf.beacon_int = 100; 808 809 if (local->hw.max_listen_interval == 0) 810 local->hw.max_listen_interval = 1; 811 812 local->hw.conf.listen_interval = local->hw.max_listen_interval; 813 814 local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC | 815 IEEE80211_HW_SIGNAL_DB | 816 IEEE80211_HW_SIGNAL_DBM) ? 817 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID; 818 local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ? 819 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID; 820 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 821 local->wstats_flags |= IW_QUAL_DBM; 822 823 result = sta_info_start(local); 824 if (result < 0) 825 goto fail_sta_info; 826 827 rtnl_lock(); 828 result = dev_alloc_name(local->mdev, local->mdev->name); 829 if (result < 0) 830 goto fail_dev; 831 832 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 833 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy)); 834 835 result = register_netdevice(local->mdev); 836 if (result < 0) 837 goto fail_dev; 838 839 result = ieee80211_init_rate_ctrl_alg(local, 840 hw->rate_control_algorithm); 841 if (result < 0) { 842 printk(KERN_DEBUG "%s: Failed to initialize rate control " 843 "algorithm\n", wiphy_name(local->hw.wiphy)); 844 goto fail_rate; 845 } 846 847 result = ieee80211_wep_init(local); 848 849 if (result < 0) { 850 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n", 851 wiphy_name(local->hw.wiphy), result); 852 goto fail_wep; 853 } 854 855 local->mdev->select_queue = ieee80211_select_queue; 856 857 /* add one default STA interface */ 858 result = ieee80211_if_add(local, "wlan%d", NULL, 859 NL80211_IFTYPE_STATION, NULL); 860 if (result) 861 printk(KERN_WARNING "%s: Failed to add default virtual iface\n", 862 wiphy_name(local->hw.wiphy)); 863 864 rtnl_unlock(); 865 866 ieee80211_led_init(local); 867 868 return 0; 869 870fail_wep: 871 rate_control_deinitialize(local); 872fail_rate: 873 unregister_netdevice(local->mdev); 874 local->mdev = NULL; 875fail_dev: 876 rtnl_unlock(); 877 sta_info_stop(local); 878fail_sta_info: 879 debugfs_hw_del(local); 880 destroy_workqueue(local->hw.workqueue); 881fail_workqueue: 882 if (local->mdev) 883 free_netdev(local->mdev); 884fail_mdev_alloc: 885 wiphy_unregister(local->hw.wiphy); 886 return result; 887} 888EXPORT_SYMBOL(ieee80211_register_hw); 889 890void ieee80211_unregister_hw(struct ieee80211_hw *hw) 891{ 892 struct ieee80211_local *local = hw_to_local(hw); 893 894 tasklet_kill(&local->tx_pending_tasklet); 895 tasklet_kill(&local->tasklet); 896 897 rtnl_lock(); 898 899 /* 900 * At this point, interface list manipulations are fine 901 * because the driver cannot be handing us frames any 902 * more and the tasklet is killed. 903 */ 904 905 /* First, we remove all virtual interfaces. */ 906 ieee80211_remove_interfaces(local); 907 908 /* then, finally, remove the master interface */ 909 unregister_netdevice(local->mdev); 910 911 rtnl_unlock(); 912 913 ieee80211_rx_bss_list_deinit(local); 914 ieee80211_clear_tx_pending(local); 915 sta_info_stop(local); 916 rate_control_deinitialize(local); 917 debugfs_hw_del(local); 918 919 if (skb_queue_len(&local->skb_queue) 920 || skb_queue_len(&local->skb_queue_unreliable)) 921 printk(KERN_WARNING "%s: skb_queue not empty\n", 922 wiphy_name(local->hw.wiphy)); 923 skb_queue_purge(&local->skb_queue); 924 skb_queue_purge(&local->skb_queue_unreliable); 925 926 destroy_workqueue(local->hw.workqueue); 927 wiphy_unregister(local->hw.wiphy); 928 ieee80211_wep_free(local); 929 ieee80211_led_exit(local); 930 free_netdev(local->mdev); 931} 932EXPORT_SYMBOL(ieee80211_unregister_hw); 933 934void ieee80211_free_hw(struct ieee80211_hw *hw) 935{ 936 struct ieee80211_local *local = hw_to_local(hw); 937 938 wiphy_free(local->hw.wiphy); 939} 940EXPORT_SYMBOL(ieee80211_free_hw); 941 942static int __init ieee80211_init(void) 943{ 944 struct sk_buff *skb; 945 int ret; 946 947 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 948 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 949 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 950 951 ret = rc80211_minstrel_init(); 952 if (ret) 953 return ret; 954 955 ret = rc80211_pid_init(); 956 if (ret) 957 return ret; 958 959 ieee80211_debugfs_netdev_init(); 960 961 return 0; 962} 963 964static void __exit ieee80211_exit(void) 965{ 966 rc80211_pid_exit(); 967 rc80211_minstrel_exit(); 968 969 /* 970 * For key todo, it'll be empty by now but the work 971 * might still be scheduled. 972 */ 973 flush_scheduled_work(); 974 975 if (mesh_allocated) 976 ieee80211s_stop(); 977 978 ieee80211_debugfs_netdev_exit(); 979} 980 981 982subsys_initcall(ieee80211_init); 983module_exit(ieee80211_exit); 984 985MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 986MODULE_LICENSE("GPL"); 987