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Linux 2.6.28-rc5
[cris-mirror.git] / net / mac80211 / main.c
blobae62ad40ad63715bed2372be5344ce3c4e4889bc
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 __le16 tx_flags;
45 u8 data_retries;
46 } __attribute__ ((packed));
47
48
49 /* must be called under mdev tx lock */
50 void ieee80211_configure_filter(struct ieee80211_local *local)
51 {
52 unsigned int changed_flags;
53 unsigned int new_flags = 0;
54
55 if (atomic_read(&local->iff_promiscs))
56 new_flags |= FIF_PROMISC_IN_BSS;
57
58 if (atomic_read(&local->iff_allmultis))
59 new_flags |= FIF_ALLMULTI;
60
61 if (local->monitors)
62 new_flags |= FIF_BCN_PRBRESP_PROMISC;
63
64 if (local->fif_fcsfail)
65 new_flags |= FIF_FCSFAIL;
66
67 if (local->fif_plcpfail)
68 new_flags |= FIF_PLCPFAIL;
69
70 if (local->fif_control)
71 new_flags |= FIF_CONTROL;
72
73 if (local->fif_other_bss)
74 new_flags |= FIF_OTHER_BSS;
75
76 changed_flags = local->filter_flags ^ new_flags;
77
78 /* be a bit nasty */
79 new_flags |= (1<<31);
80
81 local->ops->configure_filter(local_to_hw(local),
82 changed_flags, &new_flags,
83 local->mdev->mc_count,
84 local->mdev->mc_list);
85
86 WARN_ON(new_flags & (1<<31));
87
88 local->filter_flags = new_flags & ~(1<<31);
89 }
90
91 /* master interface */
92
93 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
94 {
95 memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
96 return ETH_ALEN;
97 }
98
99 static const struct header_ops ieee80211_header_ops = {
100 .create = eth_header,
101 .parse = header_parse_80211,
102 .rebuild = eth_rebuild_header,
103 .cache = eth_header_cache,
104 .cache_update = eth_header_cache_update,
105 };
106
107 static int ieee80211_master_open(struct net_device *dev)
108 {
109 struct ieee80211_master_priv *mpriv = netdev_priv(dev);
110 struct ieee80211_local *local = mpriv->local;
111 struct ieee80211_sub_if_data *sdata;
112 int res = -EOPNOTSUPP;
113
114 /* we hold the RTNL here so can safely walk the list */
115 list_for_each_entry(sdata, &local->interfaces, list) {
116 if (netif_running(sdata->dev)) {
117 res = 0;
118 break;
119 }
120 }
121
122 if (res)
123 return res;
124
125 netif_tx_start_all_queues(local->mdev);
126
127 return 0;
128 }
129
130 static int ieee80211_master_stop(struct net_device *dev)
131 {
132 struct ieee80211_master_priv *mpriv = netdev_priv(dev);
133 struct ieee80211_local *local = mpriv->local;
134 struct ieee80211_sub_if_data *sdata;
135
136 /* we hold the RTNL here so can safely walk the list */
137 list_for_each_entry(sdata, &local->interfaces, list)
138 if (netif_running(sdata->dev))
139 dev_close(sdata->dev);
140
141 return 0;
142 }
143
144 static void ieee80211_master_set_multicast_list(struct net_device *dev)
145 {
146 struct ieee80211_master_priv *mpriv = netdev_priv(dev);
147 struct ieee80211_local *local = mpriv->local;
148
149 ieee80211_configure_filter(local);
150 }
151
152 /* everything else */
153
154 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
155 {
156 struct ieee80211_local *local = sdata->local;
157 struct ieee80211_if_conf conf;
158
159 if (WARN_ON(!netif_running(sdata->dev)))
160 return 0;
161
162 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
163 return -EINVAL;
164
165 if (!local->ops->config_interface)
166 return 0;
167
168 memset(&conf, 0, sizeof(conf));
169 conf.changed = changed;
170
171 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
172 sdata->vif.type == NL80211_IFTYPE_ADHOC) {
173 conf.bssid = sdata->u.sta.bssid;
174 conf.ssid = sdata->u.sta.ssid;
175 conf.ssid_len = sdata->u.sta.ssid_len;
176 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
177 conf.bssid = sdata->dev->dev_addr;
178 conf.ssid = sdata->u.ap.ssid;
179 conf.ssid_len = sdata->u.ap.ssid_len;
180 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
181 u8 zero[ETH_ALEN] = { 0 };
182 conf.bssid = zero;
183 conf.ssid = zero;
184 conf.ssid_len = 0;
185 } else {
186 WARN_ON(1);
187 return -EINVAL;
188 }
189
190 if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
191 return -EINVAL;
192
193 if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
194 return -EINVAL;
195
196 return local->ops->config_interface(local_to_hw(local),
197 &sdata->vif, &conf);
198 }
199
200 int ieee80211_hw_config(struct ieee80211_local *local)
201 {
202 struct ieee80211_channel *chan;
203 int ret = 0;
204
205 if (local->sw_scanning)
206 chan = local->scan_channel;
207 else
208 chan = local->oper_channel;
209
210 local->hw.conf.channel = chan;
211
212 if (!local->hw.conf.power_level)
213 local->hw.conf.power_level = chan->max_power;
214 else
215 local->hw.conf.power_level = min(chan->max_power,
216 local->hw.conf.power_level);
217
218 local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
219
220 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
221 printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
222 wiphy_name(local->hw.wiphy), chan->center_freq);
223 #endif
224
225 if (local->open_count)
226 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
227
228 return ret;
229 }
230
231 /**
232 * ieee80211_handle_ht should be used only after legacy configuration
233 * has been determined namely band, as ht configuration depends upon
234 * the hardware's HT abilities for a _specific_ band.
235 */
236 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
237 struct ieee80211_ht_info *req_ht_cap,
238 struct ieee80211_ht_bss_info *req_bss_cap)
239 {
240 struct ieee80211_conf *conf = &local->hw.conf;
241 struct ieee80211_supported_band *sband;
242 struct ieee80211_ht_info ht_conf;
243 struct ieee80211_ht_bss_info ht_bss_conf;
244 u32 changed = 0;
245 int i;
246 u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
247 u8 tx_mcs_set_cap;
248
249 sband = local->hw.wiphy->bands[conf->channel->band];
250
251 memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
252 memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
253
254 /* HT is not supported */
255 if (!sband->ht_info.ht_supported) {
256 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
257 goto out;
258 }
259
260 /* disable HT */
261 if (!enable_ht) {
262 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
263 changed |= BSS_CHANGED_HT;
264 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
265 conf->ht_conf.ht_supported = 0;
266 goto out;
267 }
268
269
270 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
271 changed |= BSS_CHANGED_HT;
272
273 conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
274 ht_conf.ht_supported = 1;
275
276 ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
277 ht_conf.cap &= ~(IEEE80211_HT_CAP_SM_PS);
278 ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_SM_PS;
279 ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
280 ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
281 ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
282
283 ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
284 ht_conf.ampdu_density = req_ht_cap->ampdu_density;
285
286 /* Bits 96-100 */
287 tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
288
289 /* configure suppoerted Tx MCS according to requested MCS
290 * (based in most cases on Rx capabilities of peer) and self
291 * Tx MCS capabilities (as defined by low level driver HW
292 * Tx capabilities) */
293 if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
294 goto check_changed;
295
296 /* Counting from 0 therfore + 1 */
297 if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
298 max_tx_streams = ((tx_mcs_set_cap &
299 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
300
301 for (i = 0; i < max_tx_streams; i++)
302 ht_conf.supp_mcs_set[i] =
303 sband->ht_info.supp_mcs_set[i] &
304 req_ht_cap->supp_mcs_set[i];
305
306 if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
307 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
308 i < IEEE80211_SUPP_MCS_SET_LEN; i++)
309 ht_conf.supp_mcs_set[i] =
310 sband->ht_info.supp_mcs_set[i] &
311 req_ht_cap->supp_mcs_set[i];
312
313 check_changed:
314 /* if bss configuration changed store the new one */
315 if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
316 memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
317 changed |= BSS_CHANGED_HT;
318 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
319 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
320 }
321 out:
322 return changed;
323 }
324
325 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
326 u32 changed)
327 {
328 struct ieee80211_local *local = sdata->local;
329
330 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
331 return;
332
333 if (!changed)
334 return;
335
336 if (local->ops->bss_info_changed)
337 local->ops->bss_info_changed(local_to_hw(local),
338 &sdata->vif,
339 &sdata->bss_conf,
340 changed);
341 }
342
343 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
344 {
345 sdata->bss_conf.use_cts_prot = 0;
346 sdata->bss_conf.use_short_preamble = 0;
347 return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
348 }
349
350 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
351 struct sk_buff *skb)
352 {
353 struct ieee80211_local *local = hw_to_local(hw);
354 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
355 int tmp;
356
357 skb->dev = local->mdev;
358 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
359 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
360 &local->skb_queue : &local->skb_queue_unreliable, skb);
361 tmp = skb_queue_len(&local->skb_queue) +
362 skb_queue_len(&local->skb_queue_unreliable);
363 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
364 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
365 dev_kfree_skb_irq(skb);
366 tmp--;
367 I802_DEBUG_INC(local->tx_status_drop);
368 }
369 tasklet_schedule(&local->tasklet);
370 }
371 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
372
373 static void ieee80211_tasklet_handler(unsigned long data)
374 {
375 struct ieee80211_local *local = (struct ieee80211_local *) data;
376 struct sk_buff *skb;
377 struct ieee80211_rx_status rx_status;
378 struct ieee80211_ra_tid *ra_tid;
379
380 while ((skb = skb_dequeue(&local->skb_queue)) ||
381 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
382 switch (skb->pkt_type) {
383 case IEEE80211_RX_MSG:
384 /* status is in skb->cb */
385 memcpy(&rx_status, skb->cb, sizeof(rx_status));
386 /* Clear skb->pkt_type in order to not confuse kernel
387 * netstack. */
388 skb->pkt_type = 0;
389 __ieee80211_rx(local_to_hw(local), skb, &rx_status);
390 break;
391 case IEEE80211_TX_STATUS_MSG:
392 skb->pkt_type = 0;
393 ieee80211_tx_status(local_to_hw(local), skb);
394 break;
395 case IEEE80211_DELBA_MSG:
396 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
397 ieee80211_stop_tx_ba_cb(local_to_hw(local),
398 ra_tid->ra, ra_tid->tid);
399 dev_kfree_skb(skb);
400 break;
401 case IEEE80211_ADDBA_MSG:
402 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
403 ieee80211_start_tx_ba_cb(local_to_hw(local),
404 ra_tid->ra, ra_tid->tid);
405 dev_kfree_skb(skb);
406 break ;
407 default:
408 WARN_ON(1);
409 dev_kfree_skb(skb);
410 break;
411 }
412 }
413 }
414
415 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
416 * make a prepared TX frame (one that has been given to hw) to look like brand
417 * new IEEE 802.11 frame that is ready to go through TX processing again.
418 */
419 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
420 struct ieee80211_key *key,
421 struct sk_buff *skb)
422 {
423 unsigned int hdrlen, iv_len, mic_len;
424 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
425
426 hdrlen = ieee80211_hdrlen(hdr->frame_control);
427
428 if (!key)
429 goto no_key;
430
431 switch (key->conf.alg) {
432 case ALG_WEP:
433 iv_len = WEP_IV_LEN;
434 mic_len = WEP_ICV_LEN;
435 break;
436 case ALG_TKIP:
437 iv_len = TKIP_IV_LEN;
438 mic_len = TKIP_ICV_LEN;
439 break;
440 case ALG_CCMP:
441 iv_len = CCMP_HDR_LEN;
442 mic_len = CCMP_MIC_LEN;
443 break;
444 default:
445 goto no_key;
446 }
447
448 if (skb->len >= hdrlen + mic_len &&
449 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
450 skb_trim(skb, skb->len - mic_len);
451 if (skb->len >= hdrlen + iv_len) {
452 memmove(skb->data + iv_len, skb->data, hdrlen);
453 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
454 }
455
456 no_key:
457 if (ieee80211_is_data_qos(hdr->frame_control)) {
458 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
459 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
460 hdrlen - IEEE80211_QOS_CTL_LEN);
461 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
462 }
463 }
464
465 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
466 struct sta_info *sta,
467 struct sk_buff *skb)
468 {
469 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
470
471 sta->tx_filtered_count++;
472
473 /*
474 * Clear the TX filter mask for this STA when sending the next
475 * packet. If the STA went to power save mode, this will happen
476 * when it wakes up for the next time.
477 */
478 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
479
480 /*
481 * This code races in the following way:
482 *
483 * (1) STA sends frame indicating it will go to sleep and does so
484 * (2) hardware/firmware adds STA to filter list, passes frame up
485 * (3) hardware/firmware processes TX fifo and suppresses a frame
486 * (4) we get TX status before having processed the frame and
487 * knowing that the STA has gone to sleep.
488 *
489 * This is actually quite unlikely even when both those events are
490 * processed from interrupts coming in quickly after one another or
491 * even at the same time because we queue both TX status events and
492 * RX frames to be processed by a tasklet and process them in the
493 * same order that they were received or TX status last. Hence, there
494 * is no race as long as the frame RX is processed before the next TX
495 * status, which drivers can ensure, see below.
496 *
497 * Note that this can only happen if the hardware or firmware can
498 * actually add STAs to the filter list, if this is done by the
499 * driver in response to set_tim() (which will only reduce the race
500 * this whole filtering tries to solve, not completely solve it)
501 * this situation cannot happen.
502 *
503 * To completely solve this race drivers need to make sure that they
504 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
505 * functions and
506 * (b) always process RX events before TX status events if ordering
507 * can be unknown, for example with different interrupt status
508 * bits.
509 */
510 if (test_sta_flags(sta, WLAN_STA_PS) &&
511 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
512 ieee80211_remove_tx_extra(local, sta->key, skb);
513 skb_queue_tail(&sta->tx_filtered, skb);
514 return;
515 }
516
517 if (!test_sta_flags(sta, WLAN_STA_PS) &&
518 !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
519 /* Software retry the packet once */
520 info->flags |= IEEE80211_TX_CTL_REQUEUE;
521 ieee80211_remove_tx_extra(local, sta->key, skb);
522 dev_queue_xmit(skb);
523 return;
524 }
525
526 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
527 if (net_ratelimit())
528 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
529 "queue_len=%d PS=%d @%lu\n",
530 wiphy_name(local->hw.wiphy),
531 skb_queue_len(&sta->tx_filtered),
532 !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
533 #endif
534 dev_kfree_skb(skb);
535 }
536
537 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
538 {
539 struct sk_buff *skb2;
540 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
541 struct ieee80211_local *local = hw_to_local(hw);
542 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
543 u16 frag, type;
544 __le16 fc;
545 struct ieee80211_supported_band *sband;
546 struct ieee80211_tx_status_rtap_hdr *rthdr;
547 struct ieee80211_sub_if_data *sdata;
548 struct net_device *prev_dev = NULL;
549 struct sta_info *sta;
550
551 rcu_read_lock();
552
553 sta = sta_info_get(local, hdr->addr1);
554
555 if (sta) {
556 if (info->status.excessive_retries &&
557 test_sta_flags(sta, WLAN_STA_PS)) {
558 /*
559 * The STA is in power save mode, so assume
560 * that this TX packet failed because of that.
561 */
562 ieee80211_handle_filtered_frame(local, sta, skb);
563 rcu_read_unlock();
564 return;
565 }
566
567 fc = hdr->frame_control;
568
569 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
570 (ieee80211_is_data_qos(fc))) {
571 u16 tid, ssn;
572 u8 *qc;
573
574 qc = ieee80211_get_qos_ctl(hdr);
575 tid = qc[0] & 0xf;
576 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
577 & IEEE80211_SCTL_SEQ);
578 ieee80211_send_bar(sta->sdata, hdr->addr1,
579 tid, ssn);
580 }
581
582 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
583 ieee80211_handle_filtered_frame(local, sta, skb);
584 rcu_read_unlock();
585 return;
586 } else {
587 if (info->status.excessive_retries)
588 sta->tx_retry_failed++;
589 sta->tx_retry_count += info->status.retry_count;
590 }
591
592 sband = local->hw.wiphy->bands[info->band];
593 rate_control_tx_status(local, sband, sta, skb);
594 }
595
596 rcu_read_unlock();
597
598 ieee80211_led_tx(local, 0);
599
600 /* SNMP counters
601 * Fragments are passed to low-level drivers as separate skbs, so these
602 * are actually fragments, not frames. Update frame counters only for
603 * the first fragment of the frame. */
604
605 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
606 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
607
608 if (info->flags & IEEE80211_TX_STAT_ACK) {
609 if (frag == 0) {
610 local->dot11TransmittedFrameCount++;
611 if (is_multicast_ether_addr(hdr->addr1))
612 local->dot11MulticastTransmittedFrameCount++;
613 if (info->status.retry_count > 0)
614 local->dot11RetryCount++;
615 if (info->status.retry_count > 1)
616 local->dot11MultipleRetryCount++;
617 }
618
619 /* This counter shall be incremented for an acknowledged MPDU
620 * with an individual address in the address 1 field or an MPDU
621 * with a multicast address in the address 1 field of type Data
622 * or Management. */
623 if (!is_multicast_ether_addr(hdr->addr1) ||
624 type == IEEE80211_FTYPE_DATA ||
625 type == IEEE80211_FTYPE_MGMT)
626 local->dot11TransmittedFragmentCount++;
627 } else {
628 if (frag == 0)
629 local->dot11FailedCount++;
630 }
631
632 /* this was a transmitted frame, but now we want to reuse it */
633 skb_orphan(skb);
634
635 /*
636 * This is a bit racy but we can avoid a lot of work
637 * with this test...
638 */
639 if (!local->monitors && !local->cooked_mntrs) {
640 dev_kfree_skb(skb);
641 return;
642 }
643
644 /* send frame to monitor interfaces now */
645
646 if (skb_headroom(skb) < sizeof(*rthdr)) {
647 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
648 dev_kfree_skb(skb);
649 return;
650 }
651
652 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
653 skb_push(skb, sizeof(*rthdr));
654
655 memset(rthdr, 0, sizeof(*rthdr));
656 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
657 rthdr->hdr.it_present =
658 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
659 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
660
661 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
662 !is_multicast_ether_addr(hdr->addr1))
663 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
664
665 if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
666 (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
667 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
668 else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
669 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
670
671 rthdr->data_retries = info->status.retry_count;
672
673 /* XXX: is this sufficient for BPF? */
674 skb_set_mac_header(skb, 0);
675 skb->ip_summed = CHECKSUM_UNNECESSARY;
676 skb->pkt_type = PACKET_OTHERHOST;
677 skb->protocol = htons(ETH_P_802_2);
678 memset(skb->cb, 0, sizeof(skb->cb));
679
680 rcu_read_lock();
681 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
682 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
683 if (!netif_running(sdata->dev))
684 continue;
685
686 if (prev_dev) {
687 skb2 = skb_clone(skb, GFP_ATOMIC);
688 if (skb2) {
689 skb2->dev = prev_dev;
690 netif_rx(skb2);
691 }
692 }
693
694 prev_dev = sdata->dev;
695 }
696 }
697 if (prev_dev) {
698 skb->dev = prev_dev;
699 netif_rx(skb);
700 skb = NULL;
701 }
702 rcu_read_unlock();
703 dev_kfree_skb(skb);
704 }
705 EXPORT_SYMBOL(ieee80211_tx_status);
706
707 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
708 const struct ieee80211_ops *ops)
709 {
710 struct ieee80211_local *local;
711 int priv_size;
712 struct wiphy *wiphy;
713
714 /* Ensure 32-byte alignment of our private data and hw private data.
715 * We use the wiphy priv data for both our ieee80211_local and for
716 * the driver's private data
717 *
718 * In memory it'll be like this:
719 *
720 * +-------------------------+
721 * | struct wiphy |
722 * +-------------------------+
723 * | struct ieee80211_local |
724 * +-------------------------+
725 * | driver's private data |
726 * +-------------------------+
727 *
728 */
729 priv_size = ((sizeof(struct ieee80211_local) +
730 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
731 priv_data_len;
732
733 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
734
735 if (!wiphy)
736 return NULL;
737
738 wiphy->privid = mac80211_wiphy_privid;
739
740 local = wiphy_priv(wiphy);
741 local->hw.wiphy = wiphy;
742
743 local->hw.priv = (char *)local +
744 ((sizeof(struct ieee80211_local) +
745 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
746
747 BUG_ON(!ops->tx);
748 BUG_ON(!ops->start);
749 BUG_ON(!ops->stop);
750 BUG_ON(!ops->config);
751 BUG_ON(!ops->add_interface);
752 BUG_ON(!ops->remove_interface);
753 BUG_ON(!ops->configure_filter);
754 local->ops = ops;
755
756 local->hw.queues = 1; /* default */
757
758 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
759 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
760 local->short_retry_limit = 7;
761 local->long_retry_limit = 4;
762 local->hw.conf.radio_enabled = 1;
763
764 INIT_LIST_HEAD(&local->interfaces);
765
766 spin_lock_init(&local->key_lock);
767
768 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
769
770 sta_info_init(local);
771
772 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
773 (unsigned long)local);
774 tasklet_disable(&local->tx_pending_tasklet);
775
776 tasklet_init(&local->tasklet,
777 ieee80211_tasklet_handler,
778 (unsigned long) local);
779 tasklet_disable(&local->tasklet);
780
781 skb_queue_head_init(&local->skb_queue);
782 skb_queue_head_init(&local->skb_queue_unreliable);
783
784 return local_to_hw(local);
785 }
786 EXPORT_SYMBOL(ieee80211_alloc_hw);
787
788 int ieee80211_register_hw(struct ieee80211_hw *hw)
789 {
790 struct ieee80211_local *local = hw_to_local(hw);
791 const char *name;
792 int result;
793 enum ieee80211_band band;
794 struct net_device *mdev;
795 struct ieee80211_master_priv *mpriv;
796
797 /*
798 * generic code guarantees at least one band,
799 * set this very early because much code assumes
800 * that hw.conf.channel is assigned
801 */
802 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
803 struct ieee80211_supported_band *sband;
804
805 sband = local->hw.wiphy->bands[band];
806 if (sband) {
807 /* init channel we're on */
808 local->hw.conf.channel =
809 local->oper_channel =
810 local->scan_channel = &sband->channels[0];
811 break;
812 }
813 }
814
815 /* if low-level driver supports AP, we also support VLAN */
816 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
817 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
818
819 /* mac80211 always supports monitor */
820 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
821
822 result = wiphy_register(local->hw.wiphy);
823 if (result < 0)
824 return result;
825
826 /*
827 * We use the number of queues for feature tests (QoS, HT) internally
828 * so restrict them appropriately.
829 */
830 if (hw->queues > IEEE80211_MAX_QUEUES)
831 hw->queues = IEEE80211_MAX_QUEUES;
832 if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
833 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
834 if (hw->queues < 4)
835 hw->ampdu_queues = 0;
836
837 mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
838 "wmaster%d", ether_setup,
839 ieee80211_num_queues(hw));
840 if (!mdev)
841 goto fail_mdev_alloc;
842
843 mpriv = netdev_priv(mdev);
844 mpriv->local = local;
845 local->mdev = mdev;
846
847 ieee80211_rx_bss_list_init(local);
848
849 mdev->hard_start_xmit = ieee80211_master_start_xmit;
850 mdev->open = ieee80211_master_open;
851 mdev->stop = ieee80211_master_stop;
852 mdev->type = ARPHRD_IEEE80211;
853 mdev->header_ops = &ieee80211_header_ops;
854 mdev->set_multicast_list = ieee80211_master_set_multicast_list;
855
856 name = wiphy_dev(local->hw.wiphy)->driver->name;
857 local->hw.workqueue = create_freezeable_workqueue(name);
858 if (!local->hw.workqueue) {
859 result = -ENOMEM;
860 goto fail_workqueue;
861 }
862
863 /*
864 * The hardware needs headroom for sending the frame,
865 * and we need some headroom for passing the frame to monitor
866 * interfaces, but never both at the same time.
867 */
868 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
869 sizeof(struct ieee80211_tx_status_rtap_hdr));
870
871 debugfs_hw_add(local);
872
873 if (local->hw.conf.beacon_int < 10)
874 local->hw.conf.beacon_int = 100;
875
876 if (local->hw.max_listen_interval == 0)
877 local->hw.max_listen_interval = 1;
878
879 local->hw.conf.listen_interval = local->hw.max_listen_interval;
880
881 local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
882 IEEE80211_HW_SIGNAL_DB |
883 IEEE80211_HW_SIGNAL_DBM) ?
884 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
885 local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
886 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
887 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
888 local->wstats_flags |= IW_QUAL_DBM;
889
890 result = sta_info_start(local);
891 if (result < 0)
892 goto fail_sta_info;
893
894 rtnl_lock();
895 result = dev_alloc_name(local->mdev, local->mdev->name);
896 if (result < 0)
897 goto fail_dev;
898
899 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
900 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
901
902 result = register_netdevice(local->mdev);
903 if (result < 0)
904 goto fail_dev;
905
906 result = ieee80211_init_rate_ctrl_alg(local,
907 hw->rate_control_algorithm);
908 if (result < 0) {
909 printk(KERN_DEBUG "%s: Failed to initialize rate control "
910 "algorithm\n", wiphy_name(local->hw.wiphy));
911 goto fail_rate;
912 }
913
914 result = ieee80211_wep_init(local);
915
916 if (result < 0) {
917 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
918 wiphy_name(local->hw.wiphy), result);
919 goto fail_wep;
920 }
921
922 local->mdev->select_queue = ieee80211_select_queue;
923
924 /* add one default STA interface */
925 result = ieee80211_if_add(local, "wlan%d", NULL,
926 NL80211_IFTYPE_STATION, NULL);
927 if (result)
928 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
929 wiphy_name(local->hw.wiphy));
930
931 rtnl_unlock();
932
933 ieee80211_led_init(local);
934
935 return 0;
936
937 fail_wep:
938 rate_control_deinitialize(local);
939 fail_rate:
940 unregister_netdevice(local->mdev);
941 local->mdev = NULL;
942 fail_dev:
943 rtnl_unlock();
944 sta_info_stop(local);
945 fail_sta_info:
946 debugfs_hw_del(local);
947 destroy_workqueue(local->hw.workqueue);
948 fail_workqueue:
949 if (local->mdev)
950 free_netdev(local->mdev);
951 fail_mdev_alloc:
952 wiphy_unregister(local->hw.wiphy);
953 return result;
954 }
955 EXPORT_SYMBOL(ieee80211_register_hw);
956
957 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
958 {
959 struct ieee80211_local *local = hw_to_local(hw);
960
961 tasklet_kill(&local->tx_pending_tasklet);
962 tasklet_kill(&local->tasklet);
963
964 rtnl_lock();
965
966 /*
967 * At this point, interface list manipulations are fine
968 * because the driver cannot be handing us frames any
969 * more and the tasklet is killed.
970 */
971
972 /* First, we remove all virtual interfaces. */
973 ieee80211_remove_interfaces(local);
974
975 /* then, finally, remove the master interface */
976 unregister_netdevice(local->mdev);
977
978 rtnl_unlock();
979
980 ieee80211_rx_bss_list_deinit(local);
981 ieee80211_clear_tx_pending(local);
982 sta_info_stop(local);
983 rate_control_deinitialize(local);
984 debugfs_hw_del(local);
985
986 if (skb_queue_len(&local->skb_queue)
987 || skb_queue_len(&local->skb_queue_unreliable))
988 printk(KERN_WARNING "%s: skb_queue not empty\n",
989 wiphy_name(local->hw.wiphy));
990 skb_queue_purge(&local->skb_queue);
991 skb_queue_purge(&local->skb_queue_unreliable);
992
993 destroy_workqueue(local->hw.workqueue);
994 wiphy_unregister(local->hw.wiphy);
995 ieee80211_wep_free(local);
996 ieee80211_led_exit(local);
997 free_netdev(local->mdev);
998 }
999 EXPORT_SYMBOL(ieee80211_unregister_hw);
1000
1001 void ieee80211_free_hw(struct ieee80211_hw *hw)
1002 {
1003 struct ieee80211_local *local = hw_to_local(hw);
1004
1005 wiphy_free(local->hw.wiphy);
1006 }
1007 EXPORT_SYMBOL(ieee80211_free_hw);
1008
1009 static int __init ieee80211_init(void)
1010 {
1011 struct sk_buff *skb;
1012 int ret;
1013
1014 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1015 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1016 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1017
1018 ret = rc80211_minstrel_init();
1019 if (ret)
1020 return ret;
1021
1022 ret = rc80211_pid_init();
1023 if (ret)
1024 return ret;
1025
1026 ieee80211_debugfs_netdev_init();
1027
1028 return 0;
1029 }
1030
1031 static void __exit ieee80211_exit(void)
1032 {
1033 rc80211_pid_exit();
1034 rc80211_minstrel_exit();
1035
1036 /*
1037 * For key todo, it'll be empty by now but the work
1038 * might still be scheduled.
1039 */
1040 flush_scheduled_work();
1041
1042 if (mesh_allocated)
1043 ieee80211s_stop();
1044
1045 ieee80211_debugfs_netdev_exit();
1046 }
1047
1048
1049 subsys_initcall(ieee80211_init);
1050 module_exit(ieee80211_exit);
1051
1052 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1053 MODULE_LICENSE("GPL");
CRIS linux kernel tree