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 */
42 struct 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 */
ieee80211_configure_filter(struct ieee80211_local * local)52 void 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
header_parse_80211(const struct sk_buff * skb,unsigned char * haddr)95 static 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
101 static 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
ieee80211_master_open(struct net_device * dev)109 static 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
ieee80211_master_stop(struct net_device * dev)132 static 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
ieee80211_master_set_multicast_list(struct net_device * dev)146 static 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
ieee80211_if_config(struct ieee80211_sub_if_data * sdata,u32 changed)156 int 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
ieee80211_hw_config(struct ieee80211_local * local,u32 changed)193 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
194 {
195 struct ieee80211_channel *chan;
196 int ret = 0;
197 int power;
198 enum nl80211_channel_type channel_type;
199
200 might_sleep();
201
202 if (local->sw_scanning) {
203 chan = local->scan_channel;
204 channel_type = NL80211_CHAN_NO_HT;
205 } else {
206 chan = local->oper_channel;
207 channel_type = local->oper_channel_type;
208 }
209
210 if (chan != local->hw.conf.channel ||
211 channel_type != local->hw.conf.ht.channel_type) {
212 local->hw.conf.channel = chan;
213 local->hw.conf.ht.channel_type = channel_type;
214 switch (channel_type) {
215 case NL80211_CHAN_NO_HT:
216 local->hw.conf.ht.enabled = false;
217 break;
218 case NL80211_CHAN_HT20:
219 case NL80211_CHAN_HT40MINUS:
220 case NL80211_CHAN_HT40PLUS:
221 local->hw.conf.ht.enabled = true;
222 break;
223 }
224 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
225 }
226
227 if (!local->hw.conf.power_level)
228 power = chan->max_power;
229 else
230 power = min(chan->max_power, local->hw.conf.power_level);
231 if (local->hw.conf.power_level != power) {
232 changed |= IEEE80211_CONF_CHANGE_POWER;
233 local->hw.conf.power_level = power;
234 }
235
236 if (changed && local->open_count) {
237 ret = local->ops->config(local_to_hw(local), changed);
238 /*
239 * Goal:
240 * HW reconfiguration should never fail, the driver has told
241 * us what it can support so it should live up to that promise.
242 *
243 * Current status:
244 * rfkill is not integrated with mac80211 and a
245 * configuration command can thus fail if hardware rfkill
246 * is enabled
247 *
248 * FIXME: integrate rfkill with mac80211 and then add this
249 * WARN_ON() back
250 *
251 */
252 /* WARN_ON(ret); */
253 }
254
255 return ret;
256 }
257
ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data * sdata,u32 changed)258 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
259 u32 changed)
260 {
261 struct ieee80211_local *local = sdata->local;
262
263 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
264 return;
265
266 if (!changed)
267 return;
268
269 if (local->ops->bss_info_changed)
270 local->ops->bss_info_changed(local_to_hw(local),
271 &sdata->vif,
272 &sdata->vif.bss_conf,
273 changed);
274 }
275
ieee80211_reset_erp_info(struct ieee80211_sub_if_data * sdata)276 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
277 {
278 sdata->vif.bss_conf.use_cts_prot = false;
279 sdata->vif.bss_conf.use_short_preamble = false;
280 sdata->vif.bss_conf.use_short_slot = false;
281 return BSS_CHANGED_ERP_CTS_PROT |
282 BSS_CHANGED_ERP_PREAMBLE |
283 BSS_CHANGED_ERP_SLOT;
284 }
285
ieee80211_tx_status_irqsafe(struct ieee80211_hw * hw,struct sk_buff * skb)286 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
287 struct sk_buff *skb)
288 {
289 struct ieee80211_local *local = hw_to_local(hw);
290 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
291 int tmp;
292
293 skb->dev = local->mdev;
294 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
295 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
296 &local->skb_queue : &local->skb_queue_unreliable, skb);
297 tmp = skb_queue_len(&local->skb_queue) +
298 skb_queue_len(&local->skb_queue_unreliable);
299 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
300 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
301 dev_kfree_skb_irq(skb);
302 tmp--;
303 I802_DEBUG_INC(local->tx_status_drop);
304 }
305 tasklet_schedule(&local->tasklet);
306 }
307 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
308
ieee80211_tasklet_handler(unsigned long data)309 static void ieee80211_tasklet_handler(unsigned long data)
310 {
311 struct ieee80211_local *local = (struct ieee80211_local *) data;
312 struct sk_buff *skb;
313 struct ieee80211_rx_status rx_status;
314 struct ieee80211_ra_tid *ra_tid;
315
316 while ((skb = skb_dequeue(&local->skb_queue)) ||
317 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
318 switch (skb->pkt_type) {
319 case IEEE80211_RX_MSG:
320 /* status is in skb->cb */
321 memcpy(&rx_status, skb->cb, sizeof(rx_status));
322 /* Clear skb->pkt_type in order to not confuse kernel
323 * netstack. */
324 skb->pkt_type = 0;
325 __ieee80211_rx(local_to_hw(local), skb, &rx_status);
326 break;
327 case IEEE80211_TX_STATUS_MSG:
328 skb->pkt_type = 0;
329 ieee80211_tx_status(local_to_hw(local), skb);
330 break;
331 case IEEE80211_DELBA_MSG:
332 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
333 ieee80211_stop_tx_ba_cb(local_to_hw(local),
334 ra_tid->ra, ra_tid->tid);
335 dev_kfree_skb(skb);
336 break;
337 case IEEE80211_ADDBA_MSG:
338 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
339 ieee80211_start_tx_ba_cb(local_to_hw(local),
340 ra_tid->ra, ra_tid->tid);
341 dev_kfree_skb(skb);
342 break ;
343 default:
344 WARN(1, "mac80211: Packet is of unknown type %d\n",
345 skb->pkt_type);
346 dev_kfree_skb(skb);
347 break;
348 }
349 }
350 }
351
352 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
353 * make a prepared TX frame (one that has been given to hw) to look like brand
354 * new IEEE 802.11 frame that is ready to go through TX processing again.
355 */
ieee80211_remove_tx_extra(struct ieee80211_local * local,struct ieee80211_key * key,struct sk_buff * skb)356 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
357 struct ieee80211_key *key,
358 struct sk_buff *skb)
359 {
360 unsigned int hdrlen, iv_len, mic_len;
361 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
362
363 hdrlen = ieee80211_hdrlen(hdr->frame_control);
364
365 if (!key)
366 goto no_key;
367
368 switch (key->conf.alg) {
369 case ALG_WEP:
370 iv_len = WEP_IV_LEN;
371 mic_len = WEP_ICV_LEN;
372 break;
373 case ALG_TKIP:
374 iv_len = TKIP_IV_LEN;
375 mic_len = TKIP_ICV_LEN;
376 break;
377 case ALG_CCMP:
378 iv_len = CCMP_HDR_LEN;
379 mic_len = CCMP_MIC_LEN;
380 break;
381 default:
382 goto no_key;
383 }
384
385 if (skb->len >= hdrlen + mic_len &&
386 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
387 skb_trim(skb, skb->len - mic_len);
388 if (skb->len >= hdrlen + iv_len) {
389 memmove(skb->data + iv_len, skb->data, hdrlen);
390 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
391 }
392
393 no_key:
394 if (ieee80211_is_data_qos(hdr->frame_control)) {
395 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
396 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
397 hdrlen - IEEE80211_QOS_CTL_LEN);
398 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
399 }
400 }
401
ieee80211_handle_filtered_frame(struct ieee80211_local * local,struct sta_info * sta,struct sk_buff * skb)402 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
403 struct sta_info *sta,
404 struct sk_buff *skb)
405 {
406 sta->tx_filtered_count++;
407
408 /*
409 * Clear the TX filter mask for this STA when sending the next
410 * packet. If the STA went to power save mode, this will happen
411 * when it wakes up for the next time.
412 */
413 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
414
415 /*
416 * This code races in the following way:
417 *
418 * (1) STA sends frame indicating it will go to sleep and does so
419 * (2) hardware/firmware adds STA to filter list, passes frame up
420 * (3) hardware/firmware processes TX fifo and suppresses a frame
421 * (4) we get TX status before having processed the frame and
422 * knowing that the STA has gone to sleep.
423 *
424 * This is actually quite unlikely even when both those events are
425 * processed from interrupts coming in quickly after one another or
426 * even at the same time because we queue both TX status events and
427 * RX frames to be processed by a tasklet and process them in the
428 * same order that they were received or TX status last. Hence, there
429 * is no race as long as the frame RX is processed before the next TX
430 * status, which drivers can ensure, see below.
431 *
432 * Note that this can only happen if the hardware or firmware can
433 * actually add STAs to the filter list, if this is done by the
434 * driver in response to set_tim() (which will only reduce the race
435 * this whole filtering tries to solve, not completely solve it)
436 * this situation cannot happen.
437 *
438 * To completely solve this race drivers need to make sure that they
439 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
440 * functions and
441 * (b) always process RX events before TX status events if ordering
442 * can be unknown, for example with different interrupt status
443 * bits.
444 */
445 if (test_sta_flags(sta, WLAN_STA_PS) &&
446 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
447 ieee80211_remove_tx_extra(local, sta->key, skb);
448 skb_queue_tail(&sta->tx_filtered, skb);
449 return;
450 }
451
452 if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
453 /* Software retry the packet once */
454 skb->requeue = 1;
455 ieee80211_remove_tx_extra(local, sta->key, skb);
456 dev_queue_xmit(skb);
457 return;
458 }
459
460 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
461 if (net_ratelimit())
462 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
463 "queue_len=%d PS=%d @%lu\n",
464 wiphy_name(local->hw.wiphy),
465 skb_queue_len(&sta->tx_filtered),
466 !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
467 #endif
468 dev_kfree_skb(skb);
469 }
470
ieee80211_tx_status(struct ieee80211_hw * hw,struct sk_buff * skb)471 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
472 {
473 struct sk_buff *skb2;
474 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
475 struct ieee80211_local *local = hw_to_local(hw);
476 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
477 u16 frag, type;
478 __le16 fc;
479 struct ieee80211_supported_band *sband;
480 struct ieee80211_tx_status_rtap_hdr *rthdr;
481 struct ieee80211_sub_if_data *sdata;
482 struct net_device *prev_dev = NULL;
483 struct sta_info *sta;
484 int retry_count = -1, i;
485
486 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
487 /* the HW cannot have attempted that rate */
488 if (i >= hw->max_rates) {
489 info->status.rates[i].idx = -1;
490 info->status.rates[i].count = 0;
491 }
492
493 retry_count += info->status.rates[i].count;
494 }
495 if (retry_count < 0)
496 retry_count = 0;
497
498 rcu_read_lock();
499
500 sband = local->hw.wiphy->bands[info->band];
501
502 sta = sta_info_get(local, hdr->addr1);
503
504 if (sta) {
505 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
506 test_sta_flags(sta, WLAN_STA_PS)) {
507 /*
508 * The STA is in power save mode, so assume
509 * that this TX packet failed because of that.
510 */
511 ieee80211_handle_filtered_frame(local, sta, skb);
512 rcu_read_unlock();
513 return;
514 }
515
516 fc = hdr->frame_control;
517
518 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
519 (ieee80211_is_data_qos(fc))) {
520 u16 tid, ssn;
521 u8 *qc;
522
523 qc = ieee80211_get_qos_ctl(hdr);
524 tid = qc[0] & 0xf;
525 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
526 & IEEE80211_SCTL_SEQ);
527 ieee80211_send_bar(sta->sdata, hdr->addr1,
528 tid, ssn);
529 }
530
531 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
532 ieee80211_handle_filtered_frame(local, sta, skb);
533 rcu_read_unlock();
534 return;
535 } else {
536 if (!(info->flags & IEEE80211_TX_STAT_ACK))
537 sta->tx_retry_failed++;
538 sta->tx_retry_count += retry_count;
539 }
540
541 rate_control_tx_status(local, sband, sta, skb);
542 }
543
544 rcu_read_unlock();
545
546 ieee80211_led_tx(local, 0);
547
548 /* SNMP counters
549 * Fragments are passed to low-level drivers as separate skbs, so these
550 * are actually fragments, not frames. Update frame counters only for
551 * the first fragment of the frame. */
552
553 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
554 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
555
556 if (info->flags & IEEE80211_TX_STAT_ACK) {
557 if (frag == 0) {
558 local->dot11TransmittedFrameCount++;
559 if (is_multicast_ether_addr(hdr->addr1))
560 local->dot11MulticastTransmittedFrameCount++;
561 if (retry_count > 0)
562 local->dot11RetryCount++;
563 if (retry_count > 1)
564 local->dot11MultipleRetryCount++;
565 }
566
567 /* This counter shall be incremented for an acknowledged MPDU
568 * with an individual address in the address 1 field or an MPDU
569 * with a multicast address in the address 1 field of type Data
570 * or Management. */
571 if (!is_multicast_ether_addr(hdr->addr1) ||
572 type == IEEE80211_FTYPE_DATA ||
573 type == IEEE80211_FTYPE_MGMT)
574 local->dot11TransmittedFragmentCount++;
575 } else {
576 if (frag == 0)
577 local->dot11FailedCount++;
578 }
579
580 /* this was a transmitted frame, but now we want to reuse it */
581 skb_orphan(skb);
582
583 /*
584 * This is a bit racy but we can avoid a lot of work
585 * with this test...
586 */
587 if (!local->monitors && !local->cooked_mntrs) {
588 dev_kfree_skb(skb);
589 return;
590 }
591
592 /* send frame to monitor interfaces now */
593
594 if (skb_headroom(skb) < sizeof(*rthdr)) {
595 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
596 dev_kfree_skb(skb);
597 return;
598 }
599
600 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
601 skb_push(skb, sizeof(*rthdr));
602
603 memset(rthdr, 0, sizeof(*rthdr));
604 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
605 rthdr->hdr.it_present =
606 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
607 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
608 (1 << IEEE80211_RADIOTAP_RATE));
609
610 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
611 !is_multicast_ether_addr(hdr->addr1))
612 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
613
614 /*
615 * XXX: Once radiotap gets the bitmap reset thing the vendor
616 * extensions proposal contains, we can actually report
617 * the whole set of tries we did.
618 */
619 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
620 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
621 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
622 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
623 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
624 if (info->status.rates[0].idx >= 0 &&
625 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
626 rthdr->rate = sband->bitrates[
627 info->status.rates[0].idx].bitrate / 5;
628
629 /* for now report the total retry_count */
630 rthdr->data_retries = retry_count;
631
632 /* XXX: is this sufficient for BPF? */
633 skb_set_mac_header(skb, 0);
634 skb->ip_summed = CHECKSUM_UNNECESSARY;
635 skb->pkt_type = PACKET_OTHERHOST;
636 skb->protocol = htons(ETH_P_802_2);
637 memset(skb->cb, 0, sizeof(skb->cb));
638
639 rcu_read_lock();
640 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
641 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
642 if (!netif_running(sdata->dev))
643 continue;
644
645 if (prev_dev) {
646 skb2 = skb_clone(skb, GFP_ATOMIC);
647 if (skb2) {
648 skb2->dev = prev_dev;
649 netif_rx(skb2);
650 }
651 }
652
653 prev_dev = sdata->dev;
654 }
655 }
656 if (prev_dev) {
657 skb->dev = prev_dev;
658 netif_rx(skb);
659 skb = NULL;
660 }
661 rcu_read_unlock();
662 dev_kfree_skb(skb);
663 }
664 EXPORT_SYMBOL(ieee80211_tx_status);
665
ieee80211_alloc_hw(size_t priv_data_len,const struct ieee80211_ops * ops)666 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
667 const struct ieee80211_ops *ops)
668 {
669 struct ieee80211_local *local;
670 int priv_size;
671 struct wiphy *wiphy;
672
673 /* Ensure 32-byte alignment of our private data and hw private data.
674 * We use the wiphy priv data for both our ieee80211_local and for
675 * the driver's private data
676 *
677 * In memory it'll be like this:
678 *
679 * +-------------------------+
680 * | struct wiphy |
681 * +-------------------------+
682 * | struct ieee80211_local |
683 * +-------------------------+
684 * | driver's private data |
685 * +-------------------------+
686 *
687 */
688 priv_size = ((sizeof(struct ieee80211_local) +
689 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
690 priv_data_len;
691
692 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
693
694 if (!wiphy)
695 return NULL;
696
697 wiphy->privid = mac80211_wiphy_privid;
698
699 local = wiphy_priv(wiphy);
700 local->hw.wiphy = wiphy;
701
702 local->hw.priv = (char *)local +
703 ((sizeof(struct ieee80211_local) +
704 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
705
706 BUG_ON(!ops->tx);
707 BUG_ON(!ops->start);
708 BUG_ON(!ops->stop);
709 BUG_ON(!ops->config);
710 BUG_ON(!ops->add_interface);
711 BUG_ON(!ops->remove_interface);
712 BUG_ON(!ops->configure_filter);
713 local->ops = ops;
714
715 /* set up some defaults */
716 local->hw.queues = 1;
717 local->hw.max_rates = 1;
718 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
719 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
720 local->hw.conf.long_frame_max_tx_count = 4;
721 local->hw.conf.short_frame_max_tx_count = 7;
722 local->hw.conf.radio_enabled = true;
723
724 INIT_LIST_HEAD(&local->interfaces);
725
726 spin_lock_init(&local->key_lock);
727
728 spin_lock_init(&local->queue_stop_reason_lock);
729
730 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
731
732 INIT_WORK(&local->dynamic_ps_enable_work,
733 ieee80211_dynamic_ps_enable_work);
734 INIT_WORK(&local->dynamic_ps_disable_work,
735 ieee80211_dynamic_ps_disable_work);
736 setup_timer(&local->dynamic_ps_timer,
737 ieee80211_dynamic_ps_timer, (unsigned long) local);
738
739 sta_info_init(local);
740
741 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
742 (unsigned long)local);
743 tasklet_disable(&local->tx_pending_tasklet);
744
745 tasklet_init(&local->tasklet,
746 ieee80211_tasklet_handler,
747 (unsigned long) local);
748 tasklet_disable(&local->tasklet);
749
750 skb_queue_head_init(&local->skb_queue);
751 skb_queue_head_init(&local->skb_queue_unreliable);
752
753 return local_to_hw(local);
754 }
755 EXPORT_SYMBOL(ieee80211_alloc_hw);
756
ieee80211_register_hw(struct ieee80211_hw * hw)757 int ieee80211_register_hw(struct ieee80211_hw *hw)
758 {
759 struct ieee80211_local *local = hw_to_local(hw);
760 int result;
761 enum ieee80211_band band;
762 struct net_device *mdev;
763 struct ieee80211_master_priv *mpriv;
764
765 /*
766 * generic code guarantees at least one band,
767 * set this very early because much code assumes
768 * that hw.conf.channel is assigned
769 */
770 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
771 struct ieee80211_supported_band *sband;
772
773 sband = local->hw.wiphy->bands[band];
774 if (sband) {
775 /* init channel we're on */
776 local->hw.conf.channel =
777 local->oper_channel =
778 local->scan_channel = &sband->channels[0];
779 break;
780 }
781 }
782
783 /* if low-level driver supports AP, we also support VLAN */
784 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
785 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
786
787 /* mac80211 always supports monitor */
788 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
789
790 result = wiphy_register(local->hw.wiphy);
791 if (result < 0)
792 return result;
793
794 /*
795 * We use the number of queues for feature tests (QoS, HT) internally
796 * so restrict them appropriately.
797 */
798 if (hw->queues > IEEE80211_MAX_QUEUES)
799 hw->queues = IEEE80211_MAX_QUEUES;
800 if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
801 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
802 if (hw->queues < 4)
803 hw->ampdu_queues = 0;
804
805 mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
806 "wmaster%d", ether_setup,
807 ieee80211_num_queues(hw));
808 if (!mdev)
809 goto fail_mdev_alloc;
810
811 mpriv = netdev_priv(mdev);
812 mpriv->local = local;
813 local->mdev = mdev;
814
815 ieee80211_rx_bss_list_init(local);
816
817 mdev->hard_start_xmit = ieee80211_master_start_xmit;
818 mdev->open = ieee80211_master_open;
819 mdev->stop = ieee80211_master_stop;
820 mdev->type = ARPHRD_IEEE80211;
821 mdev->header_ops = &ieee80211_header_ops;
822 mdev->set_multicast_list = ieee80211_master_set_multicast_list;
823
824 local->hw.workqueue =
825 create_freezeable_workqueue(wiphy_name(local->hw.wiphy));
826 if (!local->hw.workqueue) {
827 result = -ENOMEM;
828 goto fail_workqueue;
829 }
830
831 /*
832 * The hardware needs headroom for sending the frame,
833 * and we need some headroom for passing the frame to monitor
834 * interfaces, but never both at the same time.
835 */
836 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
837 sizeof(struct ieee80211_tx_status_rtap_hdr));
838
839 debugfs_hw_add(local);
840
841 if (local->hw.conf.beacon_int < 10)
842 local->hw.conf.beacon_int = 100;
843
844 if (local->hw.max_listen_interval == 0)
845 local->hw.max_listen_interval = 1;
846
847 local->hw.conf.listen_interval = local->hw.max_listen_interval;
848
849 local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
850 IEEE80211_HW_SIGNAL_DB |
851 IEEE80211_HW_SIGNAL_DBM) ?
852 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
853 local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
854 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
855 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
856 local->wstats_flags |= IW_QUAL_DBM;
857
858 result = sta_info_start(local);
859 if (result < 0)
860 goto fail_sta_info;
861
862 rtnl_lock();
863 result = dev_alloc_name(local->mdev, local->mdev->name);
864 if (result < 0)
865 goto fail_dev;
866
867 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
868 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
869
870 result = register_netdevice(local->mdev);
871 if (result < 0)
872 goto fail_dev;
873
874 result = ieee80211_init_rate_ctrl_alg(local,
875 hw->rate_control_algorithm);
876 if (result < 0) {
877 printk(KERN_DEBUG "%s: Failed to initialize rate control "
878 "algorithm\n", wiphy_name(local->hw.wiphy));
879 goto fail_rate;
880 }
881
882 result = ieee80211_wep_init(local);
883
884 if (result < 0) {
885 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
886 wiphy_name(local->hw.wiphy), result);
887 goto fail_wep;
888 }
889
890 local->mdev->select_queue = ieee80211_select_queue;
891
892 /* add one default STA interface if supported */
893 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
894 result = ieee80211_if_add(local, "wlan%d", NULL,
895 NL80211_IFTYPE_STATION, NULL);
896 if (result)
897 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
898 wiphy_name(local->hw.wiphy));
899 }
900
901 rtnl_unlock();
902
903 ieee80211_led_init(local);
904
905 return 0;
906
907 fail_wep:
908 rate_control_deinitialize(local);
909 fail_rate:
910 unregister_netdevice(local->mdev);
911 local->mdev = NULL;
912 fail_dev:
913 rtnl_unlock();
914 sta_info_stop(local);
915 fail_sta_info:
916 debugfs_hw_del(local);
917 destroy_workqueue(local->hw.workqueue);
918 fail_workqueue:
919 if (local->mdev)
920 free_netdev(local->mdev);
921 fail_mdev_alloc:
922 wiphy_unregister(local->hw.wiphy);
923 return result;
924 }
925 EXPORT_SYMBOL(ieee80211_register_hw);
926
ieee80211_unregister_hw(struct ieee80211_hw * hw)927 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
928 {
929 struct ieee80211_local *local = hw_to_local(hw);
930
931 tasklet_kill(&local->tx_pending_tasklet);
932 tasklet_kill(&local->tasklet);
933
934 rtnl_lock();
935
936 /*
937 * At this point, interface list manipulations are fine
938 * because the driver cannot be handing us frames any
939 * more and the tasklet is killed.
940 */
941
942 /* First, we remove all virtual interfaces. */
943 ieee80211_remove_interfaces(local);
944
945 /* then, finally, remove the master interface */
946 unregister_netdevice(local->mdev);
947
948 rtnl_unlock();
949
950 ieee80211_rx_bss_list_deinit(local);
951 ieee80211_clear_tx_pending(local);
952 sta_info_stop(local);
953 rate_control_deinitialize(local);
954 debugfs_hw_del(local);
955
956 if (skb_queue_len(&local->skb_queue)
957 || skb_queue_len(&local->skb_queue_unreliable))
958 printk(KERN_WARNING "%s: skb_queue not empty\n",
959 wiphy_name(local->hw.wiphy));
960 skb_queue_purge(&local->skb_queue);
961 skb_queue_purge(&local->skb_queue_unreliable);
962
963 destroy_workqueue(local->hw.workqueue);
964 wiphy_unregister(local->hw.wiphy);
965 ieee80211_wep_free(local);
966 ieee80211_led_exit(local);
967 free_netdev(local->mdev);
968 }
969 EXPORT_SYMBOL(ieee80211_unregister_hw);
970
ieee80211_free_hw(struct ieee80211_hw * hw)971 void ieee80211_free_hw(struct ieee80211_hw *hw)
972 {
973 struct ieee80211_local *local = hw_to_local(hw);
974
975 wiphy_free(local->hw.wiphy);
976 }
977 EXPORT_SYMBOL(ieee80211_free_hw);
978
ieee80211_init(void)979 static int __init ieee80211_init(void)
980 {
981 struct sk_buff *skb;
982 int ret;
983
984 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
985 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
986 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
987
988 ret = rc80211_minstrel_init();
989 if (ret)
990 return ret;
991
992 ret = rc80211_pid_init();
993 if (ret)
994 return ret;
995
996 ieee80211_debugfs_netdev_init();
997
998 return 0;
999 }
1000
ieee80211_exit(void)1001 static void __exit ieee80211_exit(void)
1002 {
1003 rc80211_pid_exit();
1004 rc80211_minstrel_exit();
1005
1006 /*
1007 * For key todo, it'll be empty by now but the work
1008 * might still be scheduled.
1009 */
1010 flush_scheduled_work();
1011
1012 if (mesh_allocated)
1013 ieee80211s_stop();
1014
1015 ieee80211_debugfs_netdev_exit();
1016 }
1017
1018
1019 subsys_initcall(ieee80211_init);
1020 module_exit(ieee80211_exit);
1021
1022 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1023 MODULE_LICENSE("GPL");
1024