]> git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blame - net/mac80211/rx.c
projects / mirror_ubuntu-jammy-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[MAC80211]: kill key_mgmt, use key_management_enabled
[mirror_ubuntu-jammy-kernel.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 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 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/kernel.h>
13#include <linux/skbuff.h>
14#include <linux/netdevice.h>
15#include <linux/etherdevice.h>
16#include <net/iw_handler.h>
17#include <net/mac80211.h>
18#include <net/ieee80211_radiotap.h>
19
20#include "ieee80211_i.h"
21#include "ieee80211_led.h"
22#include "ieee80211_common.h"
23#include "wep.h"
24#include "wpa.h"
25#include "tkip.h"
26#include "wme.h"
27
28/* pre-rx handlers
29 *
30 * these don't have dev/sdata fields in the rx data
52865dfd
JB		 31 * The sta value should also not be used because it may
32 * be NULL even though a STA (in IBSS mode) will be added.
571ecf67
JB		 33 */
34
6e0d114d
JB		 35static ieee80211_txrx_result
36ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
37{
38 u8 *data = rx->skb->data;
39 int tid;
40
41 /* does the frame have a qos control field? */
42 if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
43 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
44 /* frame has qos control */
45 tid = qc[0] & QOS_CONTROL_TID_MASK;
46 } else {
47 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
48 /* Separate TID for management frames */
49 tid = NUM_RX_DATA_QUEUES - 1;
50 } else {
51 /* no qos control present */
52 tid = 0; /* 802.1d - Best Effort */
53 }
54 }
52865dfd 55
6e0d114d 56 I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
52865dfd
JB		 57 /* only a debug counter, sta might not be assigned properly yet */
58 if (rx->sta)
6e0d114d 59 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
6e0d114d
JB		 60
61 rx->u.rx.queue = tid;
62 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
63 * For now, set skb->priority to 0 for other cases. */
64 rx->skb->priority = (tid > 7) ? 0 : tid;
65
66 return TXRX_CONTINUE;
67}
68
571ecf67
JB		 69static ieee80211_txrx_result
70ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
71{
72 struct ieee80211_local *local = rx->local;
73 struct sk_buff *skb = rx->skb;
74 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
75 u32 load = 0, hdrtime;
76 struct ieee80211_rate *rate;
77 struct ieee80211_hw_mode *mode = local->hw.conf.mode;
78 int i;
79
80 /* Estimate total channel use caused by this frame */
81
82 if (unlikely(mode->num_rates < 0))
83 return TXRX_CONTINUE;
84
85 rate = &mode->rates[0];
86 for (i = 0; i < mode->num_rates; i++) {
87 if (mode->rates[i].val == rx->u.rx.status->rate) {
88 rate = &mode->rates[i];
89 break;
90 }
91 }
92
93 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
94 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
95
96 if (mode->mode == MODE_IEEE80211A ||
97 mode->mode == MODE_ATHEROS_TURBO ||
98 mode->mode == MODE_ATHEROS_TURBOG ||
99 (mode->mode == MODE_IEEE80211G &&
100 rate->flags & IEEE80211_RATE_ERP))
101 hdrtime = CHAN_UTIL_HDR_SHORT;
102 else
103 hdrtime = CHAN_UTIL_HDR_LONG;
104
105 load = hdrtime;
106 if (!is_multicast_ether_addr(hdr->addr1))
107 load += hdrtime;
108
109 load += skb->len * rate->rate_inv;
110
111 /* Divide channel_use by 8 to avoid wrapping around the counter */
112 load >>= CHAN_UTIL_SHIFT;
113 local->channel_use_raw += load;
571ecf67
JB		 114 rx->u.rx.load = load;
115
116 return TXRX_CONTINUE;
117}
118
119ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
120{
121 ieee80211_rx_h_parse_qos,
122 ieee80211_rx_h_load_stats,
123 NULL
124};
125
126/* rx handlers */
127
128static ieee80211_txrx_result
129ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
130{
52865dfd
JB		 131 if (rx->sta)
132 rx->sta->channel_use_raw += rx->u.rx.load;
571ecf67
JB		 133 rx->sdata->channel_use_raw += rx->u.rx.load;
134 return TXRX_CONTINUE;
135}
136
137static void
138ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb,
139 struct ieee80211_rx_status *status)
140{
141 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
142 struct ieee80211_sub_if_data *sdata;
143 struct ieee80211_rate *rate;
144 struct ieee80211_rtap_hdr {
145 struct ieee80211_radiotap_header hdr;
146 u8 flags;
147 u8 rate;
148 __le16 chan_freq;
149 __le16 chan_flags;
150 u8 antsignal;
151 } __attribute__ ((packed)) *rthdr;
152
153 skb->dev = dev;
154
155 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
156
157 if (status->flag & RX_FLAG_RADIOTAP)
158 goto out;
159
160 if (skb_headroom(skb) < sizeof(*rthdr)) {
161 I802_DEBUG_INC(local->rx_expand_skb_head);
162 if (pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
163 dev_kfree_skb(skb);
164 return;
165 }
166 }
167
168 rthdr = (struct ieee80211_rtap_hdr *) skb_push(skb, sizeof(*rthdr));
169 memset(rthdr, 0, sizeof(*rthdr));
170 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
171 rthdr->hdr.it_present =
172 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
173 (1 << IEEE80211_RADIOTAP_RATE) |
174 (1 << IEEE80211_RADIOTAP_CHANNEL) |
175 (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL));
176 rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
177 IEEE80211_RADIOTAP_F_FCS : 0;
178 rate = ieee80211_get_rate(local, status->phymode, status->rate);
179 if (rate)
180 rthdr->rate = rate->rate / 5;
181 rthdr->chan_freq = cpu_to_le16(status->freq);
182 rthdr->chan_flags =
183 status->phymode == MODE_IEEE80211A ?
184 cpu_to_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ) :
185 cpu_to_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ);
186 rthdr->antsignal = status->ssi;
187
188 out:
189 sdata->stats.rx_packets++;
190 sdata->stats.rx_bytes += skb->len;
191
192 skb_set_mac_header(skb, 0);
193 skb->ip_summed = CHECKSUM_UNNECESSARY;
194 skb->pkt_type = PACKET_OTHERHOST;
195 skb->protocol = htons(ETH_P_802_2);
196 memset(skb->cb, 0, sizeof(skb->cb));
197 netif_rx(skb);
198}
199
200static ieee80211_txrx_result
201ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx)
202{
203 if (rx->sdata->type == IEEE80211_IF_TYPE_MNTR) {
204 ieee80211_rx_monitor(rx->dev, rx->skb, rx->u.rx.status);
205 return TXRX_QUEUED;
206 }
207
208 if (rx->u.rx.status->flag & RX_FLAG_RADIOTAP)
209 skb_pull(rx->skb, ieee80211_get_radiotap_len(rx->skb->data));
210
211 return TXRX_CONTINUE;
212}
213
214static ieee80211_txrx_result
215ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
216{
217 struct ieee80211_local *local = rx->local;
218 struct sk_buff *skb = rx->skb;
219
220 if (unlikely(local->sta_scanning != 0)) {
221 ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
222 return TXRX_QUEUED;
223 }
224
225 if (unlikely(rx->u.rx.in_scan)) {
226 /* scanning finished during invoking of handlers */
227 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
228 return TXRX_DROP;
229 }
230
231 return TXRX_CONTINUE;
232}
233
234static ieee80211_txrx_result
235ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
236{
237 struct ieee80211_hdr *hdr;
571ecf67
JB		 238 hdr = (struct ieee80211_hdr *) rx->skb->data;
239
240 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
241 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
242 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
243 rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
244 hdr->seq_ctrl)) {
245 if (rx->u.rx.ra_match) {
246 rx->local->dot11FrameDuplicateCount++;
247 rx->sta->num_duplicates++;
248 }
249 return TXRX_DROP;
250 } else
251 rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
252 }
253
254 if ((rx->local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) &&
255 rx->skb->len > FCS_LEN)
256 skb_trim(rx->skb, rx->skb->len - FCS_LEN);
257
258 if (unlikely(rx->skb->len < 16)) {
259 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
260 return TXRX_DROP;
261 }
262
263 if (!rx->u.rx.ra_match)
264 rx->skb->pkt_type = PACKET_OTHERHOST;
265 else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
266 rx->skb->pkt_type = PACKET_HOST;
267 else if (is_multicast_ether_addr(hdr->addr1)) {
268 if (is_broadcast_ether_addr(hdr->addr1))
269 rx->skb->pkt_type = PACKET_BROADCAST;
270 else
271 rx->skb->pkt_type = PACKET_MULTICAST;
272 } else
273 rx->skb->pkt_type = PACKET_OTHERHOST;
274
275 /* Drop disallowed frame classes based on STA auth/assoc state;
276 * IEEE 802.11, Chap 5.5.
277 *
278 * 80211.o does filtering only based on association state, i.e., it
279 * drops Class 3 frames from not associated stations. hostapd sends
280 * deauth/disassoc frames when needed. In addition, hostapd is
281 * responsible for filtering on both auth and assoc states.
282 */
283 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
284 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
285 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
286 rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
287 (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
288 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
289 !(rx->fc & IEEE80211_FCTL_TODS) &&
290 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
291 || !rx->u.rx.ra_match) {
292 /* Drop IBSS frames and frames for other hosts
293 * silently. */
294 return TXRX_DROP;
295 }
296
297 if (!rx->local->apdev)
298 return TXRX_DROP;
299
300 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
301 ieee80211_msg_sta_not_assoc);
302 return TXRX_QUEUED;
303 }
304
570bd537
JB		 305 return TXRX_CONTINUE;
306}
307
308
309static ieee80211_txrx_result
310ieee80211_rx_h_load_key(struct ieee80211_txrx_data *rx)
311{
312 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
3017b80b
JB		 313 int keyidx;
314 int hdrlen;
570bd537 315
3017b80b
JB		 316 /*
317 * Key selection 101
318 *
319 * There are three types of keys:
320 * - GTK (group keys)
321 * - PTK (pairwise keys)
322 * - STK (station-to-station pairwise keys)
323 *
324 * When selecting a key, we have to distinguish between multicast
325 * (including broadcast) and unicast frames, the latter can only
326 * use PTKs and STKs while the former always use GTKs. Unless, of
327 * course, actual WEP keys ("pre-RSNA") are used, then unicast
328 * frames can also use key indizes like GTKs. Hence, if we don't
329 * have a PTK/STK we check the key index for a WEP key.
330 *
331 * There is also a slight problem in IBSS mode: GTKs are negotiated
332 * with each station, that is something we don't currently handle.
333 */
334
335 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
336 return TXRX_CONTINUE;
571ecf67 337
3017b80b
JB		 338 /*
339 * No point in finding a key if the frame is neither
340 * addressed to us nor a multicast frame.
341 */
342 if (!rx->u.rx.ra_match)
343 return TXRX_CONTINUE;
344
345 if (!is_multicast_ether_addr(hdr->addr1) && rx->sta && rx->sta->key) {
571ecf67
JB		 346 rx->key = rx->sta->key;
347 } else {
3017b80b
JB		 348 /*
349 * The device doesn't give us the IV so we won't be
350 * able to look up the key. That's ok though, we
351 * don't need to decrypt the frame, we just won't
352 * be able to keep statistics accurate.
353 * Except for key threshold notifications, should
354 * we somehow allow the driver to tell us which key
355 * the hardware used if this flag is set?
356 */
357 if (!(rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV))
358 return TXRX_CONTINUE;
359
360 hdrlen = ieee80211_get_hdrlen(rx->fc);
361
362 if (rx->skb->len < 8 + hdrlen)
363 return TXRX_DROP; /* TODO: count this? */
364
365 /*
366 * no need to call ieee80211_wep_get_keyidx,
367 * it verifies a bunch of things we've done already
368 */
369 keyidx = rx->skb->data[hdrlen + 3] >> 6;
370
371 rx->key = rx->sdata->keys[keyidx];
372
373 /*
374 * RSNA-protected unicast frames should always be sent with
375 * pairwise or station-to-station keys, but for WEP we allow
376 * using a key index as well.
377 */
378 if (rx->key && rx->key->alg != ALG_WEP &&
379 !is_multicast_ether_addr(hdr->addr1))
380 rx->key = NULL;
571ecf67
JB		 381 }
382
3017b80b 383 if (rx->key) {
571ecf67
JB		 384 rx->key->tx_rx_count++;
385 if (unlikely(rx->local->key_tx_rx_threshold &&
386 rx->key->tx_rx_count >
387 rx->local->key_tx_rx_threshold)) {
388 ieee80211_key_threshold_notify(rx->dev, rx->key,
389 rx->sta);
390 }
391 }
392
393 return TXRX_CONTINUE;
394}
395
396static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
397{
398 struct ieee80211_sub_if_data *sdata;
399 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
400
401 if (sdata->bss)
402 atomic_inc(&sdata->bss->num_sta_ps);
403 sta->flags |= WLAN_STA_PS;
404 sta->pspoll = 0;
405#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
406 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d enters power "
407 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
408#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
409}
410
411static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
412{
413 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
414 struct sk_buff *skb;
415 int sent = 0;
416 struct ieee80211_sub_if_data *sdata;
417 struct ieee80211_tx_packet_data *pkt_data;
418
419 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
420 if (sdata->bss)
421 atomic_dec(&sdata->bss->num_sta_ps);
422 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
423 sta->pspoll = 0;
424 if (!skb_queue_empty(&sta->ps_tx_buf)) {
425 if (local->ops->set_tim)
426 local->ops->set_tim(local_to_hw(local), sta->aid, 0);
427 if (sdata->bss)
428 bss_tim_clear(local, sdata->bss, sta->aid);
429 }
430#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
431 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d exits power "
432 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
433#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
434 /* Send all buffered frames to the station */
435 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
436 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
437 sent++;
438 pkt_data->requeue = 1;
439 dev_queue_xmit(skb);
440 }
441 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
442 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
443 local->total_ps_buffered--;
444 sent++;
445#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
446 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d send PS frame "
447 "since STA not sleeping anymore\n", dev->name,
448 MAC_ARG(sta->addr), sta->aid);
449#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
450 pkt_data->requeue = 1;
451 dev_queue_xmit(skb);
452 }
453
454 return sent;
455}
456
457static ieee80211_txrx_result
458ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
459{
460 struct sta_info *sta = rx->sta;
461 struct net_device *dev = rx->dev;
462 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
463
464 if (!sta)
465 return TXRX_CONTINUE;
466
467 /* Update last_rx only for IBSS packets which are for the current
468 * BSSID to avoid keeping the current IBSS network alive in cases where
469 * other STAs are using different BSSID. */
470 if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
471 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
472 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
473 sta->last_rx = jiffies;
474 } else
475 if (!is_multicast_ether_addr(hdr->addr1) ||
476 rx->sdata->type == IEEE80211_IF_TYPE_STA) {
477 /* Update last_rx only for unicast frames in order to prevent
478 * the Probe Request frames (the only broadcast frames from a
479 * STA in infrastructure mode) from keeping a connection alive.
480 */
481 sta->last_rx = jiffies;
482 }
483
484 if (!rx->u.rx.ra_match)
485 return TXRX_CONTINUE;
486
487 sta->rx_fragments++;
488 sta->rx_bytes += rx->skb->len;
489 sta->last_rssi = (sta->last_rssi * 15 +
490 rx->u.rx.status->ssi) / 16;
491 sta->last_signal = (sta->last_signal * 15 +
492 rx->u.rx.status->signal) / 16;
493 sta->last_noise = (sta->last_noise * 15 +
494 rx->u.rx.status->noise) / 16;
495
496 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
497 /* Change STA power saving mode only in the end of a frame
498 * exchange sequence */
499 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
500 rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
501 else if (!(sta->flags & WLAN_STA_PS) &&
502 (rx->fc & IEEE80211_FCTL_PM))
503 ap_sta_ps_start(dev, sta);
504 }
505
506 /* Drop data::nullfunc frames silently, since they are used only to
507 * control station power saving mode. */
508 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
509 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
510 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
511 /* Update counter and free packet here to avoid counting this
512 * as a dropped packed. */
513 sta->rx_packets++;
514 dev_kfree_skb(rx->skb);
515 return TXRX_QUEUED;
516 }
517
518 return TXRX_CONTINUE;
519} /* ieee80211_rx_h_sta_process */
520
521static ieee80211_txrx_result
522ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
523{
524 if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
525 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
526 !rx->key || rx->key->alg != ALG_WEP || !rx->u.rx.ra_match)
527 return TXRX_CONTINUE;
528
529 /* Check for weak IVs, if hwaccel did not remove IV from the frame */
530 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) ||
531 rx->key->force_sw_encrypt) {
532 u8 *iv = ieee80211_wep_is_weak_iv(rx->skb, rx->key);
533 if (iv) {
534 rx->sta->wep_weak_iv_count++;
535 }
536 }
537
538 return TXRX_CONTINUE;
539}
540
541static ieee80211_txrx_result
542ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx)
543{
571ecf67
JB		 544 if ((rx->key && rx->key->alg != ALG_WEP) ||
545 !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
546 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
547 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
548 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
549 return TXRX_CONTINUE;
550
551 if (!rx->key) {
1a84f3fd
JB		 552 if (net_ratelimit())
553 printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n",
554 rx->dev->name);
571ecf67
JB		 555 return TXRX_DROP;
556 }
557
558 if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED) ||
559 rx->key->force_sw_encrypt) {
560 if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
1a84f3fd
JB		 561 if (net_ratelimit())
562 printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
563 "failed\n", rx->dev->name);
571ecf67
JB		 564 return TXRX_DROP;
565 }
566 } else if (rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
567 ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
568 /* remove ICV */
569 skb_trim(rx->skb, rx->skb->len - 4);
570 }
571
572 return TXRX_CONTINUE;
573}
574
575static inline struct ieee80211_fragment_entry *
576ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
577 unsigned int frag, unsigned int seq, int rx_queue,
578 struct sk_buff **skb)
579{
580 struct ieee80211_fragment_entry *entry;
581 int idx;
582
583 idx = sdata->fragment_next;
584 entry = &sdata->fragments[sdata->fragment_next++];
585 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
586 sdata->fragment_next = 0;
587
588 if (!skb_queue_empty(&entry->skb_list)) {
589#ifdef CONFIG_MAC80211_DEBUG
590 struct ieee80211_hdr *hdr =
591 (struct ieee80211_hdr *) entry->skb_list.next->data;
592 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
593 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
594 "addr1=" MAC_FMT " addr2=" MAC_FMT "\n",
595 sdata->dev->name, idx,
596 jiffies - entry->first_frag_time, entry->seq,
597 entry->last_frag, MAC_ARG(hdr->addr1),
598 MAC_ARG(hdr->addr2));
599#endif /* CONFIG_MAC80211_DEBUG */
600 __skb_queue_purge(&entry->skb_list);
601 }
602
603 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
604 *skb = NULL;
605 entry->first_frag_time = jiffies;
606 entry->seq = seq;
607 entry->rx_queue = rx_queue;
608 entry->last_frag = frag;
609 entry->ccmp = 0;
610 entry->extra_len = 0;
611
612 return entry;
613}
614
615static inline struct ieee80211_fragment_entry *
616ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
617 u16 fc, unsigned int frag, unsigned int seq,
618 int rx_queue, struct ieee80211_hdr *hdr)
619{
620 struct ieee80211_fragment_entry *entry;
621 int i, idx;
622
623 idx = sdata->fragment_next;
624 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
625 struct ieee80211_hdr *f_hdr;
626 u16 f_fc;
627
628 idx--;
629 if (idx < 0)
630 idx = IEEE80211_FRAGMENT_MAX - 1;
631
632 entry = &sdata->fragments[idx];
633 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
634 entry->rx_queue != rx_queue ||
635 entry->last_frag + 1 != frag)
636 continue;
637
638 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
639 f_fc = le16_to_cpu(f_hdr->frame_control);
640
641 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
642 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
643 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
644 continue;
645
646 if (entry->first_frag_time + 2 * HZ < jiffies) {
647 __skb_queue_purge(&entry->skb_list);
648 continue;
649 }
650 return entry;
651 }
652
653 return NULL;
654}
655
656static ieee80211_txrx_result
657ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
658{
659 struct ieee80211_hdr *hdr;
660 u16 sc;
661 unsigned int frag, seq;
662 struct ieee80211_fragment_entry *entry;
663 struct sk_buff *skb;
664
665 hdr = (struct ieee80211_hdr *) rx->skb->data;
666 sc = le16_to_cpu(hdr->seq_ctrl);
667 frag = sc & IEEE80211_SCTL_FRAG;
668
669 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
670 (rx->skb)->len < 24 ||
671 is_multicast_ether_addr(hdr->addr1))) {
672 /* not fragmented */
673 goto out;
674 }
675 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
676
677 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
678
679 if (frag == 0) {
680 /* This is the first fragment of a new frame. */
681 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
682 rx->u.rx.queue, &(rx->skb));
683 if (rx->key && rx->key->alg == ALG_CCMP &&
684 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
685 /* Store CCMP PN so that we can verify that the next
686 * fragment has a sequential PN value. */
687 entry->ccmp = 1;
688 memcpy(entry->last_pn,
689 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
690 CCMP_PN_LEN);
691 }
692 return TXRX_QUEUED;
693 }
694
695 /* This is a fragment for a frame that should already be pending in
696 * fragment cache. Add this fragment to the end of the pending entry.
697 */
698 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
699 rx->u.rx.queue, hdr);
700 if (!entry) {
701 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
702 return TXRX_DROP;
703 }
704
705 /* Verify that MPDUs within one MSDU have sequential PN values.
706 * (IEEE 802.11i, 8.3.3.4.5) */
707 if (entry->ccmp) {
708 int i;
709 u8 pn[CCMP_PN_LEN], *rpn;
710 if (!rx->key || rx->key->alg != ALG_CCMP)
711 return TXRX_DROP;
712 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
713 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
714 pn[i]++;
715 if (pn[i])
716 break;
717 }
718 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
719 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
1a84f3fd
JB		 720 if (net_ratelimit())
721 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
722 "sequential A2=" MAC_FMT
723 " PN=%02x%02x%02x%02x%02x%02x "
724 "(expected %02x%02x%02x%02x%02x%02x)\n",
725 rx->dev->name, MAC_ARG(hdr->addr2),
726 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
727 rpn[5], pn[0], pn[1], pn[2], pn[3],
728 pn[4], pn[5]);
571ecf67
JB		 729 return TXRX_DROP;
730 }
731 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
732 }
733
734 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
735 __skb_queue_tail(&entry->skb_list, rx->skb);
736 entry->last_frag = frag;
737 entry->extra_len += rx->skb->len;
738 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
739 rx->skb = NULL;
740 return TXRX_QUEUED;
741 }
742
743 rx->skb = __skb_dequeue(&entry->skb_list);
744 if (skb_tailroom(rx->skb) < entry->extra_len) {
745 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
746 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
747 GFP_ATOMIC))) {
748 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
749 __skb_queue_purge(&entry->skb_list);
750 return TXRX_DROP;
751 }
752 }
753 while ((skb = __skb_dequeue(&entry->skb_list))) {
754 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
755 dev_kfree_skb(skb);
756 }
757
758 /* Complete frame has been reassembled - process it now */
759 rx->fragmented = 1;
760
761 out:
762 if (rx->sta)
763 rx->sta->rx_packets++;
764 if (is_multicast_ether_addr(hdr->addr1))
765 rx->local->dot11MulticastReceivedFrameCount++;
766 else
767 ieee80211_led_rx(rx->local);
768 return TXRX_CONTINUE;
769}
770
771static ieee80211_txrx_result
772ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
773{
774 struct sk_buff *skb;
775 int no_pending_pkts;
776
777 if (likely(!rx->sta ||
778 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
779 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
780 !rx->u.rx.ra_match))
781 return TXRX_CONTINUE;
782
783 skb = skb_dequeue(&rx->sta->tx_filtered);
784 if (!skb) {
785 skb = skb_dequeue(&rx->sta->ps_tx_buf);
786 if (skb)
787 rx->local->total_ps_buffered--;
788 }
789 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
790 skb_queue_empty(&rx->sta->ps_tx_buf);
791
792 if (skb) {
793 struct ieee80211_hdr *hdr =
794 (struct ieee80211_hdr *) skb->data;
795
796 /* tell TX path to send one frame even though the STA may
797 * still remain is PS mode after this frame exchange */
798 rx->sta->pspoll = 1;
799
800#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
801 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS Poll (entries "
802 "after %d)\n",
803 MAC_ARG(rx->sta->addr), rx->sta->aid,
804 skb_queue_len(&rx->sta->ps_tx_buf));
805#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
806
807 /* Use MoreData flag to indicate whether there are more
808 * buffered frames for this STA */
809 if (no_pending_pkts) {
810 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
811 rx->sta->flags &= ~WLAN_STA_TIM;
812 } else
813 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
814
815 dev_queue_xmit(skb);
816
817 if (no_pending_pkts) {
818 if (rx->local->ops->set_tim)
819 rx->local->ops->set_tim(local_to_hw(rx->local),
820 rx->sta->aid, 0);
821 if (rx->sdata->bss)
822 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
823 }
824#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
825 } else if (!rx->u.rx.sent_ps_buffered) {
826 printk(KERN_DEBUG "%s: STA " MAC_FMT " sent PS Poll even "
827 "though there is no buffered frames for it\n",
828 rx->dev->name, MAC_ARG(rx->sta->addr));
829#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
830
831 }
832
833 /* Free PS Poll skb here instead of returning TXRX_DROP that would
834 * count as an dropped frame. */
835 dev_kfree_skb(rx->skb);
836
837 return TXRX_QUEUED;
838}
839
6e0d114d
JB		 840static ieee80211_txrx_result
841ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
842{
843 u16 fc = rx->fc;
844 u8 *data = rx->skb->data;
845 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
846
847 if (!WLAN_FC_IS_QOS_DATA(fc))
848 return TXRX_CONTINUE;
849
850 /* remove the qos control field, update frame type and meta-data */
851 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
852 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
853 /* change frame type to non QOS */
854 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
855 hdr->frame_control = cpu_to_le16(fc);
856
857 return TXRX_CONTINUE;
858}
859
571ecf67
JB		 860static ieee80211_txrx_result
861ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
862{
863 if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
864 rx->sdata->type != IEEE80211_IF_TYPE_STA && rx->u.rx.ra_match) {
865 /* Pass both encrypted and unencrypted EAPOL frames to user
866 * space for processing. */
867 if (!rx->local->apdev)
868 return TXRX_DROP;
869 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
870 ieee80211_msg_normal);
871 return TXRX_QUEUED;
872 }
873
874 if (unlikely(rx->sdata->ieee802_1x &&
875 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
876 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
877 (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
878 !ieee80211_is_eapol(rx->skb))) {
879#ifdef CONFIG_MAC80211_DEBUG
880 struct ieee80211_hdr *hdr =
881 (struct ieee80211_hdr *) rx->skb->data;
882 printk(KERN_DEBUG "%s: dropped frame from " MAC_FMT
883 " (unauthorized port)\n", rx->dev->name,
884 MAC_ARG(hdr->addr2));
885#endif /* CONFIG_MAC80211_DEBUG */
886 return TXRX_DROP;
887 }
888
889 return TXRX_CONTINUE;
890}
891
892static ieee80211_txrx_result
893ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
894{
3017b80b
JB		 895 /*
896 * Pass through unencrypted frames if the hardware might have
897 * decrypted them already without telling us, but that can only
898 * be true if we either didn't find a key or the found key is
899 * uploaded to the hardware.
900 */
901 if ((rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP) &&
902 (!rx->key || !rx->key->force_sw_encrypt))
571ecf67
JB		 903 return TXRX_CONTINUE;
904
905 /* Drop unencrypted frames if key is set. */
906 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
907 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
908 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
909 (rx->key || rx->sdata->drop_unencrypted) &&
910 (rx->sdata->eapol == 0 ||
911 !ieee80211_is_eapol(rx->skb)))) {
1a84f3fd
JB		 912 if (net_ratelimit())
913 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
914 "encryption\n", rx->dev->name);
571ecf67
JB		 915 return TXRX_DROP;
916 }
917 return TXRX_CONTINUE;
918}
919
920static ieee80211_txrx_result
921ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
922{
923 struct net_device *dev = rx->dev;
924 struct ieee80211_local *local = rx->local;
925 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
926 u16 fc, hdrlen, ethertype;
927 u8 *payload;
928 u8 dst[ETH_ALEN];
929 u8 src[ETH_ALEN];
930 struct sk_buff *skb = rx->skb, *skb2;
931 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
932
933 fc = rx->fc;
934 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
935 return TXRX_CONTINUE;
936
937 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
938 return TXRX_DROP;
939
940 hdrlen = ieee80211_get_hdrlen(fc);
941
942 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
943 * header
944 * IEEE 802.11 address fields:
945 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
946 * 0 0 DA SA BSSID n/a
947 * 0 1 DA BSSID SA n/a
948 * 1 0 BSSID SA DA n/a
949 * 1 1 RA TA DA SA
950 */
951
952 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
953 case IEEE80211_FCTL_TODS:
954 /* BSSID SA DA */
955 memcpy(dst, hdr->addr3, ETH_ALEN);
956 memcpy(src, hdr->addr2, ETH_ALEN);
957
958 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
959 sdata->type != IEEE80211_IF_TYPE_VLAN)) {
1a84f3fd
JB		 960 if (net_ratelimit())
961 printk(KERN_DEBUG "%s: dropped ToDS frame "
962 "(BSSID=" MAC_FMT
963 " SA=" MAC_FMT
964 " DA=" MAC_FMT ")\n",
965 dev->name,
966 MAC_ARG(hdr->addr1),
967 MAC_ARG(hdr->addr2),
968 MAC_ARG(hdr->addr3));
571ecf67
JB		 969 return TXRX_DROP;
970 }
971 break;
972 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
973 /* RA TA DA SA */
974 memcpy(dst, hdr->addr3, ETH_ALEN);
975 memcpy(src, hdr->addr4, ETH_ALEN);
976
977 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
1a84f3fd
JB		 978 if (net_ratelimit())
979 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
980 "frame (RA=" MAC_FMT
981 " TA=" MAC_FMT " DA=" MAC_FMT
982 " SA=" MAC_FMT ")\n",
983 rx->dev->name,
984 MAC_ARG(hdr->addr1),
985 MAC_ARG(hdr->addr2),
986 MAC_ARG(hdr->addr3),
987 MAC_ARG(hdr->addr4));
571ecf67
JB		 988 return TXRX_DROP;
989 }
990 break;
991 case IEEE80211_FCTL_FROMDS:
992 /* DA BSSID SA */
993 memcpy(dst, hdr->addr1, ETH_ALEN);
994 memcpy(src, hdr->addr3, ETH_ALEN);
995
996 if (sdata->type != IEEE80211_IF_TYPE_STA) {
997 return TXRX_DROP;
998 }
999 break;
1000 case 0:
1001 /* DA SA BSSID */
1002 memcpy(dst, hdr->addr1, ETH_ALEN);
1003 memcpy(src, hdr->addr2, ETH_ALEN);
1004
1005 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
1006 if (net_ratelimit()) {
1007 printk(KERN_DEBUG "%s: dropped IBSS frame (DA="
1008 MAC_FMT " SA=" MAC_FMT " BSSID=" MAC_FMT
1009 ")\n",
1010 dev->name, MAC_ARG(hdr->addr1),
1011 MAC_ARG(hdr->addr2),
1012 MAC_ARG(hdr->addr3));
1013 }
1014 return TXRX_DROP;
1015 }
1016 break;
1017 }
1018
1019 payload = skb->data + hdrlen;
1020
1021 if (unlikely(skb->len - hdrlen < 8)) {
1022 if (net_ratelimit()) {
1023 printk(KERN_DEBUG "%s: RX too short data frame "
1024 "payload\n", dev->name);
1025 }
1026 return TXRX_DROP;
1027 }
1028
1029 ethertype = (payload[6] << 8) | payload[7];
1030
1031 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1032 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1033 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1034 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1035 * replace EtherType */
1036 skb_pull(skb, hdrlen + 6);
1037 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1038 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1039 } else {
1040 struct ethhdr *ehdr;
1041 __be16 len;
1042 skb_pull(skb, hdrlen);
1043 len = htons(skb->len);
1044 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1045 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1046 memcpy(ehdr->h_source, src, ETH_ALEN);
1047 ehdr->h_proto = len;
1048 }
1049 skb->dev = dev;
1050
1051 skb2 = NULL;
1052
1053 sdata->stats.rx_packets++;
1054 sdata->stats.rx_bytes += skb->len;
1055
1056 if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
1057 || sdata->type == IEEE80211_IF_TYPE_VLAN) && rx->u.rx.ra_match) {
1058 if (is_multicast_ether_addr(skb->data)) {
1059 /* send multicast frames both to higher layers in
1060 * local net stack and back to the wireless media */
1061 skb2 = skb_copy(skb, GFP_ATOMIC);
1a84f3fd 1062 if (!skb2 && net_ratelimit())
571ecf67
JB		 1063 printk(KERN_DEBUG "%s: failed to clone "
1064 "multicast frame\n", dev->name);
1065 } else {
1066 struct sta_info *dsta;
1067 dsta = sta_info_get(local, skb->data);
1068 if (dsta && !dsta->dev) {
1a84f3fd
JB		 1069 if (net_ratelimit())
1070 printk(KERN_DEBUG "Station with null "
1071 "dev structure!\n");
571ecf67
JB		 1072 } else if (dsta && dsta->dev == dev) {
1073 /* Destination station is associated to this
1074 * AP, so send the frame directly to it and
1075 * do not pass the frame to local net stack.
1076 */
1077 skb2 = skb;
1078 skb = NULL;
1079 }
1080 if (dsta)
1081 sta_info_put(dsta);
1082 }
1083 }
1084
1085 if (skb) {
1086 /* deliver to local stack */
1087 skb->protocol = eth_type_trans(skb, dev);
1088 memset(skb->cb, 0, sizeof(skb->cb));
1089 netif_rx(skb);
1090 }
1091
1092 if (skb2) {
1093 /* send to wireless media */
1094 skb2->protocol = __constant_htons(ETH_P_802_3);
1095 skb_set_network_header(skb2, 0);
1096 skb_set_mac_header(skb2, 0);
1097 dev_queue_xmit(skb2);
1098 }
1099
1100 return TXRX_QUEUED;
1101}
1102
1103static ieee80211_txrx_result
1104ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1105{
1106 struct ieee80211_sub_if_data *sdata;
1107
1108 if (!rx->u.rx.ra_match)
1109 return TXRX_DROP;
1110
1111 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1112 if ((sdata->type == IEEE80211_IF_TYPE_STA ||
1113 sdata->type == IEEE80211_IF_TYPE_IBSS) &&
1114 !rx->local->user_space_mlme) {
1115 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1116 } else {
1117 /* Management frames are sent to hostapd for processing */
1118 if (!rx->local->apdev)
1119 return TXRX_DROP;
1120 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
1121 ieee80211_msg_normal);
1122 }
1123 return TXRX_QUEUED;
1124}
1125
1126static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1127 struct ieee80211_local *local,
1128 ieee80211_rx_handler *handlers,
1129 struct ieee80211_txrx_data *rx,
1130 struct sta_info *sta)
1131{
1132 ieee80211_rx_handler *handler;
1133 ieee80211_txrx_result res = TXRX_DROP;
1134
1135 for (handler = handlers; *handler != NULL; handler++) {
1136 res = (*handler)(rx);
8e6f0032
JB		 1137
1138 switch (res) {
1139 case TXRX_CONTINUE:
1140 continue;
1141 case TXRX_DROP:
1142 I802_DEBUG_INC(local->rx_handlers_drop);
1143 if (sta)
1144 sta->rx_dropped++;
1145 break;
1146 case TXRX_QUEUED:
1147 I802_DEBUG_INC(local->rx_handlers_queued);
571ecf67
JB		 1148 break;
1149 }
8e6f0032 1150 break;
571ecf67
JB		 1151 }
1152
8e6f0032 1153 if (res == TXRX_DROP)
571ecf67 1154 dev_kfree_skb(rx->skb);
571ecf67
JB		 1155 return res;
1156}
1157
1158static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1159 ieee80211_rx_handler *handlers,
1160 struct ieee80211_txrx_data *rx,
1161 struct sta_info *sta)
1162{
1163 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1164 TXRX_CONTINUE)
1165 dev_kfree_skb(rx->skb);
1166}
1167
1168static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1169 struct ieee80211_hdr *hdr,
1170 struct sta_info *sta,
1171 struct ieee80211_txrx_data *rx)
1172{
1173 int keyidx, hdrlen;
1174
1175 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1176 if (rx->skb->len >= hdrlen + 4)
1177 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1178 else
1179 keyidx = -1;
1180
1181 /* TODO: verify that this is not triggered by fragmented
1182 * frames (hw does not verify MIC for them). */
1a84f3fd
JB		 1183 if (net_ratelimit())
1184 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1185 "failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
1186 dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1),
1187 keyidx);
571ecf67
JB		 1188
1189 if (!sta) {
1190 /* Some hardware versions seem to generate incorrect
1191 * Michael MIC reports; ignore them to avoid triggering
1192 * countermeasures. */
1a84f3fd
JB		 1193 if (net_ratelimit())
1194 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1195 "error for unknown address " MAC_FMT "\n",
1196 dev->name, MAC_ARG(hdr->addr2));
571ecf67
JB		 1197 goto ignore;
1198 }
1199
1200 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1a84f3fd
JB		 1201 if (net_ratelimit())
1202 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1203 "error for a frame with no ISWEP flag (src "
1204 MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
571ecf67
JB		 1205 goto ignore;
1206 }
1207
1208 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
1209 rx->sdata->type == IEEE80211_IF_TYPE_AP) {
1210 keyidx = ieee80211_wep_get_keyidx(rx->skb);
1211 /* AP with Pairwise keys support should never receive Michael
1212 * MIC errors for non-zero keyidx because these are reserved
1213 * for group keys and only the AP is sending real multicast
1214 * frames in BSS. */
1215 if (keyidx) {
1a84f3fd
JB		 1216 if (net_ratelimit())
1217 printk(KERN_DEBUG "%s: ignored Michael MIC "
1218 "error for a frame with non-zero keyidx"
1219 " (%d) (src " MAC_FMT ")\n", dev->name,
1220 keyidx, MAC_ARG(hdr->addr2));
571ecf67
JB		 1221 goto ignore;
1222 }
1223 }
1224
1225 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1226 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1227 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1a84f3fd
JB		 1228 if (net_ratelimit())
1229 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1230 "error for a frame that cannot be encrypted "
1231 "(fc=0x%04x) (src " MAC_FMT ")\n",
1232 dev->name, rx->fc, MAC_ARG(hdr->addr2));
571ecf67
JB		 1233 goto ignore;
1234 }
1235
1236 do {
1237 union iwreq_data wrqu;
1238 char *buf = kmalloc(128, GFP_ATOMIC);
1239 if (!buf)
1240 break;
1241
1242 /* TODO: needed parameters: count, key type, TSC */
1243 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
1244 "keyid=%d %scast addr=" MAC_FMT ")",
1245 keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni",
1246 MAC_ARG(hdr->addr2));
1247 memset(&wrqu, 0, sizeof(wrqu));
1248 wrqu.data.length = strlen(buf);
1249 wireless_send_event(rx->dev, IWEVCUSTOM, &wrqu, buf);
1250 kfree(buf);
1251 } while (0);
1252
1253 /* TODO: consider verifying the MIC error report with software
1254 * implementation if we get too many spurious reports from the
1255 * hardware. */
1256 if (!rx->local->apdev)
1257 goto ignore;
1258 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
1259 ieee80211_msg_michael_mic_failure);
1260 return;
1261
1262 ignore:
1263 dev_kfree_skb(rx->skb);
1264 rx->skb = NULL;
1265}
1266
1267ieee80211_rx_handler ieee80211_rx_handlers[] =
1268{
1269 ieee80211_rx_h_if_stats,
1270 ieee80211_rx_h_monitor,
1271 ieee80211_rx_h_passive_scan,
1272 ieee80211_rx_h_check,
570bd537 1273 ieee80211_rx_h_load_key,
571ecf67
JB		 1274 ieee80211_rx_h_sta_process,
1275 ieee80211_rx_h_ccmp_decrypt,
1276 ieee80211_rx_h_tkip_decrypt,
1277 ieee80211_rx_h_wep_weak_iv_detection,
1278 ieee80211_rx_h_wep_decrypt,
1279 ieee80211_rx_h_defragment,
1280 ieee80211_rx_h_ps_poll,
1281 ieee80211_rx_h_michael_mic_verify,
1282 /* this must be after decryption - so header is counted in MPDU mic
1283 * must be before pae and data, so QOS_DATA format frames
1284 * are not passed to user space by these functions
1285 */
1286 ieee80211_rx_h_remove_qos_control,
1287 ieee80211_rx_h_802_1x_pae,
1288 ieee80211_rx_h_drop_unencrypted,
1289 ieee80211_rx_h_data,
1290 ieee80211_rx_h_mgmt,
1291 NULL
1292};
1293
1294/* main receive path */
1295
23a24def
JB		 1296static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1297 u8 *bssid, struct ieee80211_txrx_data *rx,
1298 struct ieee80211_hdr *hdr)
1299{
1300 int multicast = is_multicast_ether_addr(hdr->addr1);
1301
1302 switch (sdata->type) {
1303 case IEEE80211_IF_TYPE_STA:
1304 if (!bssid)
1305 return 0;
1306 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1307 if (!rx->u.rx.in_scan)
1308 return 0;
1309 rx->u.rx.ra_match = 0;
1310 } else if (!multicast &&
1311 compare_ether_addr(sdata->dev->dev_addr,
1312 hdr->addr1) != 0) {
1313 if (!sdata->promisc)
1314 return 0;
1315 rx->u.rx.ra_match = 0;
1316 }
1317 break;
1318 case IEEE80211_IF_TYPE_IBSS:
1319 if (!bssid)
1320 return 0;
1321 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1322 if (!rx->u.rx.in_scan)
1323 return 0;
1324 rx->u.rx.ra_match = 0;
1325 } else if (!multicast &&
1326 compare_ether_addr(sdata->dev->dev_addr,
1327 hdr->addr1) != 0) {
1328 if (!sdata->promisc)
1329 return 0;
1330 rx->u.rx.ra_match = 0;
1331 } else if (!rx->sta)
1332 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1333 bssid, hdr->addr2);
1334 break;
1335 case IEEE80211_IF_TYPE_AP:
1336 if (!bssid) {
1337 if (compare_ether_addr(sdata->dev->dev_addr,
1338 hdr->addr1))
1339 return 0;
1340 } else if (!ieee80211_bssid_match(bssid,
1341 sdata->dev->dev_addr)) {
1342 if (!rx->u.rx.in_scan)
1343 return 0;
1344 rx->u.rx.ra_match = 0;
1345 }
1346 if (sdata->dev == sdata->local->mdev && !rx->u.rx.in_scan)
1347 /* do not receive anything via
1348 * master device when not scanning */
1349 return 0;
1350 break;
1351 case IEEE80211_IF_TYPE_WDS:
1352 if (bssid ||
1353 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1354 return 0;
1355 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1356 return 0;
1357 break;
1358 }
1359
1360 return 1;
1361}
1362
571ecf67
JB		 1363/*
1364 * This is the receive path handler. It is called by a low level driver when an
1365 * 802.11 MPDU is received from the hardware.
1366 */
1367void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1368 struct ieee80211_rx_status *status)
1369{
1370 struct ieee80211_local *local = hw_to_local(hw);
1371 struct ieee80211_sub_if_data *sdata;
1372 struct sta_info *sta;
1373 struct ieee80211_hdr *hdr;
1374 struct ieee80211_txrx_data rx;
1375 u16 type;
23a24def 1376 int radiotap_len = 0, prepres;
8e6f0032
JB		 1377 struct ieee80211_sub_if_data *prev = NULL;
1378 struct sk_buff *skb_new;
1379 u8 *bssid;
571ecf67
JB		 1380
1381 if (status->flag & RX_FLAG_RADIOTAP) {
1382 radiotap_len = ieee80211_get_radiotap_len(skb->data);
1383 skb_pull(skb, radiotap_len);
1384 }
1385
1386 hdr = (struct ieee80211_hdr *) skb->data;
1387 memset(&rx, 0, sizeof(rx));
1388 rx.skb = skb;
1389 rx.local = local;
1390
1391 rx.u.rx.status = status;
1392 rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0;
1393 type = rx.fc & IEEE80211_FCTL_FTYPE;
1394 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1395 local->dot11ReceivedFragmentCount++;
571ecf67 1396
23a24def 1397 if (skb->len >= 16) {
571ecf67 1398 sta = rx.sta = sta_info_get(local, hdr->addr2);
23a24def
JB		 1399 if (sta) {
1400 rx.dev = rx.sta->dev;
1401 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1402 }
1403 } else
571ecf67
JB		 1404 sta = rx.sta = NULL;
1405
571ecf67
JB		 1406 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1407 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1408 goto end;
1409 }
1410
1411 if (unlikely(local->sta_scanning))
1412 rx.u.rx.in_scan = 1;
1413
1414 if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1415 sta) != TXRX_CONTINUE)
1416 goto end;
1417 skb = rx.skb;
1418
1419 skb_push(skb, radiotap_len);
1420 if (sta && !sta->assoc_ap && !(sta->flags & WLAN_STA_WDS) &&
23a24def 1421 !local->iff_promiscs && !is_multicast_ether_addr(hdr->addr1)) {
571ecf67
JB		 1422 rx.u.rx.ra_match = 1;
1423 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
23a24def 1424 rx.sta);
8e6f0032
JB		 1425 sta_info_put(sta);
1426 return;
1427 }
1428
1429 bssid = ieee80211_get_bssid(hdr, skb->len - radiotap_len);
1430
1431 read_lock(&local->sub_if_lock);
1432 list_for_each_entry(sdata, &local->sub_if_list, list) {
1433 rx.u.rx.ra_match = 1;
23a24def 1434
2a8a9a88
JB		 1435 if (!netif_running(sdata->dev))
1436 continue;
1437
23a24def
JB		 1438 prepres = prepare_for_handlers(sdata, bssid, &rx, hdr);
1439 /* prepare_for_handlers can change sta */
1440 sta = rx.sta;
1441
1442 if (!prepres)
1443 continue;
8e6f0032 1444
340e11f3
JB		 1445 /*
1446 * frame is destined for this interface, but if it's not
1447 * also for the previous one we handle that after the
1448 * loop to avoid copying the SKB once too much
1449 */
1450
1451 if (!prev) {
1452 prev = sdata;
1453 continue;
8e6f0032 1454 }
340e11f3
JB		 1455
1456 /*
1457 * frame was destined for the previous interface
1458 * so invoke RX handlers for it
1459 */
1460
1461 skb_new = skb_copy(skb, GFP_ATOMIC);
1462 if (!skb_new) {
1463 if (net_ratelimit())
1464 printk(KERN_DEBUG "%s: failed to copy "
1465 "multicast frame for %s",
1466 local->mdev->name, prev->dev->name);
1467 continue;
1468 }
1469 rx.skb = skb_new;
1470 rx.dev = prev->dev;
1471 rx.sdata = prev;
1472 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1473 &rx, sta);
8e6f0032 1474 prev = sdata;
571ecf67 1475 }
8e6f0032
JB		 1476 if (prev) {
1477 rx.skb = skb;
1478 rx.dev = prev->dev;
1479 rx.sdata = prev;
1480 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1481 &rx, sta);
1482 } else
1483 dev_kfree_skb(skb);
1484 read_unlock(&local->sub_if_lock);
571ecf67 1485
8e6f0032 1486 end:
571ecf67
JB		 1487 if (sta)
1488 sta_info_put(sta);
1489}
1490EXPORT_SYMBOL(__ieee80211_rx);
1491
1492/* This is a version of the rx handler that can be called from hard irq
1493 * context. Post the skb on the queue and schedule the tasklet */
1494void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1495 struct ieee80211_rx_status *status)
1496{
1497 struct ieee80211_local *local = hw_to_local(hw);
1498
1499 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1500
1501 skb->dev = local->mdev;
1502 /* copy status into skb->cb for use by tasklet */
1503 memcpy(skb->cb, status, sizeof(*status));
1504 skb->pkt_type = IEEE80211_RX_MSG;
1505 skb_queue_tail(&local->skb_queue, skb);
1506 tasklet_schedule(&local->tasklet);
1507}
1508EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Ubuntu Jammy Linux kernel mirror