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[PATCH] mac80211: remove ieee80211_wep_get_keyidx
[linux-2.6-block.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>
d4e46a3d 16#include <linux/rcupdate.h>
571ecf67
JB		 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
b2e7771e
JB		 28/*
29 * monitor mode reception
30 *
31 * This function cleans up the SKB, i.e. it removes all the stuff
32 * only useful for monitoring.
33 */
34static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
35 struct sk_buff *skb,
36 int rtap_len)
37{
38 skb_pull(skb, rtap_len);
39
40 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
42 skb_trim(skb, skb->len - FCS_LEN);
43 else {
44 /* driver bug */
45 WARN_ON(1);
46 dev_kfree_skb(skb);
47 skb = NULL;
48 }
49 }
50
51 return skb;
52}
53
54static inline int should_drop_frame(struct ieee80211_rx_status *status,
55 struct sk_buff *skb,
56 int present_fcs_len,
57 int radiotap_len)
58{
59 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
60
61 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
62 return 1;
63 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
64 return 1;
65 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FTYPE)) ==
66 cpu_to_le16(IEEE80211_FTYPE_CTL))
67 return 1;
68 return 0;
69}
70
71/*
72 * This function copies a received frame to all monitor interfaces and
73 * returns a cleaned-up SKB that no longer includes the FCS nor the
74 * radiotap header the driver might have added.
75 */
76static struct sk_buff *
77ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
78 struct ieee80211_rx_status *status)
79{
80 struct ieee80211_sub_if_data *sdata;
81 struct ieee80211_rate *rate;
82 int needed_headroom = 0;
83 struct ieee80211_rtap_hdr {
84 struct ieee80211_radiotap_header hdr;
85 u8 flags;
86 u8 rate;
87 __le16 chan_freq;
88 __le16 chan_flags;
89 u8 antsignal;
90 u8 padding_for_rxflags;
91 __le16 rx_flags;
92 } __attribute__ ((packed)) *rthdr;
93 struct sk_buff *skb, *skb2;
94 struct net_device *prev_dev = NULL;
95 int present_fcs_len = 0;
96 int rtap_len = 0;
97
98 /*
99 * First, we may need to make a copy of the skb because
100 * (1) we need to modify it for radiotap (if not present), and
101 * (2) the other RX handlers will modify the skb we got.
102 *
103 * We don't need to, of course, if we aren't going to return
104 * the SKB because it has a bad FCS/PLCP checksum.
105 */
106 if (status->flag & RX_FLAG_RADIOTAP)
107 rtap_len = ieee80211_get_radiotap_len(origskb->data);
108 else
109 needed_headroom = sizeof(*rthdr);
110
111 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
112 present_fcs_len = FCS_LEN;
113
114 if (!local->monitors) {
115 if (should_drop_frame(status, origskb, present_fcs_len,
116 rtap_len)) {
117 dev_kfree_skb(origskb);
118 return NULL;
119 }
120
121 return remove_monitor_info(local, origskb, rtap_len);
122 }
123
124 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
125 /* only need to expand headroom if necessary */
126 skb = origskb;
127 origskb = NULL;
128
129 /*
130 * This shouldn't trigger often because most devices have an
131 * RX header they pull before we get here, and that should
132 * be big enough for our radiotap information. We should
133 * probably export the length to drivers so that we can have
134 * them allocate enough headroom to start with.
135 */
136 if (skb_headroom(skb) < needed_headroom &&
137 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
138 dev_kfree_skb(skb);
139 return NULL;
140 }
141 } else {
142 /*
143 * Need to make a copy and possibly remove radiotap header
144 * and FCS from the original.
145 */
146 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
147
148 origskb = remove_monitor_info(local, origskb, rtap_len);
149
150 if (!skb)
151 return origskb;
152 }
153
154 /* if necessary, prepend radiotap information */
155 if (!(status->flag & RX_FLAG_RADIOTAP)) {
156 rthdr = (void *) skb_push(skb, sizeof(*rthdr));
157 memset(rthdr, 0, sizeof(*rthdr));
158 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
159 rthdr->hdr.it_present =
160 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
161 (1 << IEEE80211_RADIOTAP_RATE) |
162 (1 << IEEE80211_RADIOTAP_CHANNEL) |
163 (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL) |
164 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
165 rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
166 IEEE80211_RADIOTAP_F_FCS : 0;
167
168 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
169 rthdr->rx_flags = 0;
170 if (status->flag &
171 (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
172 rthdr->rx_flags |=
173 cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
174
175 rate = ieee80211_get_rate(local, status->phymode,
176 status->rate);
177 if (rate)
178 rthdr->rate = rate->rate / 5;
179
180 rthdr->chan_freq = cpu_to_le16(status->freq);
181
182 if (status->phymode == MODE_IEEE80211A)
183 rthdr->chan_flags =
184 cpu_to_le16(IEEE80211_CHAN_OFDM |
185 IEEE80211_CHAN_5GHZ);
186 else
187 rthdr->chan_flags =
188 cpu_to_le16(IEEE80211_CHAN_DYN |
189 IEEE80211_CHAN_2GHZ);
190
191 rthdr->antsignal = status->ssi;
192 }
193
194 skb_set_mac_header(skb, 0);
195 skb->ip_summed = CHECKSUM_UNNECESSARY;
196 skb->pkt_type = PACKET_OTHERHOST;
197 skb->protocol = htons(ETH_P_802_2);
198
199 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
200 if (!netif_running(sdata->dev))
201 continue;
202
203 if (sdata->type != IEEE80211_IF_TYPE_MNTR)
204 continue;
205
206 if (prev_dev) {
207 skb2 = skb_clone(skb, GFP_ATOMIC);
208 if (skb2) {
209 skb2->dev = prev_dev;
210 netif_rx(skb2);
211 }
212 }
213
214 prev_dev = sdata->dev;
215 sdata->dev->stats.rx_packets++;
216 sdata->dev->stats.rx_bytes += skb->len;
217 }
218
219 if (prev_dev) {
220 skb->dev = prev_dev;
221 netif_rx(skb);
222 } else
223 dev_kfree_skb(skb);
224
225 return origskb;
226}
227
228
571ecf67
JB		 229/* pre-rx handlers
230 *
231 * these don't have dev/sdata fields in the rx data
52865dfd
JB		 232 * The sta value should also not be used because it may
233 * be NULL even though a STA (in IBSS mode) will be added.
571ecf67
JB		 234 */
235
6e0d114d
JB		 236static ieee80211_txrx_result
237ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
238{
239 u8 *data = rx->skb->data;
240 int tid;
241
242 /* does the frame have a qos control field? */
243 if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
244 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
245 /* frame has qos control */
246 tid = qc[0] & QOS_CONTROL_TID_MASK;
247 } else {
248 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
249 /* Separate TID for management frames */
250 tid = NUM_RX_DATA_QUEUES - 1;
251 } else {
252 /* no qos control present */
253 tid = 0; /* 802.1d - Best Effort */
254 }
255 }
52865dfd 256
6e0d114d 257 I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
52865dfd
JB		 258 /* only a debug counter, sta might not be assigned properly yet */
259 if (rx->sta)
6e0d114d 260 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
6e0d114d
JB		 261
262 rx->u.rx.queue = tid;
263 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
264 * For now, set skb->priority to 0 for other cases. */
265 rx->skb->priority = (tid > 7) ? 0 : tid;
266
267 return TXRX_CONTINUE;
268}
269
571ecf67
JB		 270static ieee80211_txrx_result
271ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
272{
273 struct ieee80211_local *local = rx->local;
274 struct sk_buff *skb = rx->skb;
275 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
276 u32 load = 0, hdrtime;
277 struct ieee80211_rate *rate;
278 struct ieee80211_hw_mode *mode = local->hw.conf.mode;
279 int i;
280
281 /* Estimate total channel use caused by this frame */
282
283 if (unlikely(mode->num_rates < 0))
284 return TXRX_CONTINUE;
285
286 rate = &mode->rates[0];
287 for (i = 0; i < mode->num_rates; i++) {
288 if (mode->rates[i].val == rx->u.rx.status->rate) {
289 rate = &mode->rates[i];
290 break;
291 }
292 }
293
294 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
295 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
296
297 if (mode->mode == MODE_IEEE80211A ||
571ecf67
JB		 298 (mode->mode == MODE_IEEE80211G &&
299 rate->flags & IEEE80211_RATE_ERP))
300 hdrtime = CHAN_UTIL_HDR_SHORT;
301 else
302 hdrtime = CHAN_UTIL_HDR_LONG;
303
304 load = hdrtime;
305 if (!is_multicast_ether_addr(hdr->addr1))
306 load += hdrtime;
307
308 load += skb->len * rate->rate_inv;
309
310 /* Divide channel_use by 8 to avoid wrapping around the counter */
311 load >>= CHAN_UTIL_SHIFT;
312 local->channel_use_raw += load;
571ecf67
JB		 313 rx->u.rx.load = load;
314
315 return TXRX_CONTINUE;
316}
317
318ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
319{
320 ieee80211_rx_h_parse_qos,
321 ieee80211_rx_h_load_stats,
322 NULL
323};
324
325/* rx handlers */
326
327static ieee80211_txrx_result
328ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
329{
52865dfd
JB		 330 if (rx->sta)
331 rx->sta->channel_use_raw += rx->u.rx.load;
571ecf67
JB		 332 rx->sdata->channel_use_raw += rx->u.rx.load;
333 return TXRX_CONTINUE;
334}
335
571ecf67
JB		 336static ieee80211_txrx_result
337ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
338{
339 struct ieee80211_local *local = rx->local;
340 struct sk_buff *skb = rx->skb;
341
342 if (unlikely(local->sta_scanning != 0)) {
343 ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
344 return TXRX_QUEUED;
345 }
346
badffb72 347 if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) {
571ecf67
JB		 348 /* scanning finished during invoking of handlers */
349 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
350 return TXRX_DROP;
351 }
352
353 return TXRX_CONTINUE;
354}
355
356static ieee80211_txrx_result
357ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
358{
359 struct ieee80211_hdr *hdr;
571ecf67
JB		 360 hdr = (struct ieee80211_hdr *) rx->skb->data;
361
362 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
363 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
364 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
365 rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
366 hdr->seq_ctrl)) {
badffb72 367 if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) {
571ecf67
JB		 368 rx->local->dot11FrameDuplicateCount++;
369 rx->sta->num_duplicates++;
370 }
371 return TXRX_DROP;
372 } else
373 rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
374 }
375
571ecf67
JB		 376 if (unlikely(rx->skb->len < 16)) {
377 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
378 return TXRX_DROP;
379 }
380
badffb72 381 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
571ecf67
JB		 382 rx->skb->pkt_type = PACKET_OTHERHOST;
383 else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
384 rx->skb->pkt_type = PACKET_HOST;
385 else if (is_multicast_ether_addr(hdr->addr1)) {
386 if (is_broadcast_ether_addr(hdr->addr1))
387 rx->skb->pkt_type = PACKET_BROADCAST;
388 else
389 rx->skb->pkt_type = PACKET_MULTICAST;
390 } else
391 rx->skb->pkt_type = PACKET_OTHERHOST;
392
393 /* Drop disallowed frame classes based on STA auth/assoc state;
394 * IEEE 802.11, Chap 5.5.
395 *
396 * 80211.o does filtering only based on association state, i.e., it
397 * drops Class 3 frames from not associated stations. hostapd sends
398 * deauth/disassoc frames when needed. In addition, hostapd is
399 * responsible for filtering on both auth and assoc states.
400 */
401 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
402 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
403 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
404 rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
405 (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
406 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
407 !(rx->fc & IEEE80211_FCTL_TODS) &&
408 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
badffb72 409 || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
571ecf67
JB		 410 /* Drop IBSS frames and frames for other hosts
411 * silently. */
412 return TXRX_DROP;
413 }
414
415 if (!rx->local->apdev)
416 return TXRX_DROP;
417
418 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
419 ieee80211_msg_sta_not_assoc);
420 return TXRX_QUEUED;
421 }
422
570bd537
JB		 423 return TXRX_CONTINUE;
424}
425
426
427static ieee80211_txrx_result
428ieee80211_rx_h_load_key(struct ieee80211_txrx_data *rx)
429{
430 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
3017b80b
JB		 431 int keyidx;
432 int hdrlen;
d4e46a3d 433 struct ieee80211_key *stakey = NULL;
570bd537 434
3017b80b
JB		 435 /*
436 * Key selection 101
437 *
438 * There are three types of keys:
439 * - GTK (group keys)
440 * - PTK (pairwise keys)
441 * - STK (station-to-station pairwise keys)
442 *
443 * When selecting a key, we have to distinguish between multicast
444 * (including broadcast) and unicast frames, the latter can only
445 * use PTKs and STKs while the former always use GTKs. Unless, of
446 * course, actual WEP keys ("pre-RSNA") are used, then unicast
447 * frames can also use key indizes like GTKs. Hence, if we don't
448 * have a PTK/STK we check the key index for a WEP key.
449 *
8dc06a1c
JB		 450 * Note that in a regular BSS, multicast frames are sent by the
451 * AP only, associated stations unicast the frame to the AP first
452 * which then multicasts it on their behalf.
453 *
3017b80b
JB		 454 * There is also a slight problem in IBSS mode: GTKs are negotiated
455 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 456 * The spec seems to expect that one negotiates the same key with
457 * every station but there's no such requirement; VLANs could be
458 * possible.
3017b80b
JB		 459 */
460
461 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
462 return TXRX_CONTINUE;
571ecf67 463
3017b80b
JB		 464 /*
465 * No point in finding a key if the frame is neither
466 * addressed to us nor a multicast frame.
467 */
badffb72 468 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
3017b80b
JB		 469 return TXRX_CONTINUE;
470
d4e46a3d
JB		 471 if (rx->sta)
472 stakey = rcu_dereference(rx->sta->key);
473
474 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
475 rx->key = stakey;
571ecf67 476 } else {
3017b80b
JB		 477 /*
478 * The device doesn't give us the IV so we won't be
479 * able to look up the key. That's ok though, we
480 * don't need to decrypt the frame, we just won't
481 * be able to keep statistics accurate.
482 * Except for key threshold notifications, should
483 * we somehow allow the driver to tell us which key
484 * the hardware used if this flag is set?
485 */
7848ba7d
JB		 486 if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
487 (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
3017b80b
JB		 488 return TXRX_CONTINUE;
489
490 hdrlen = ieee80211_get_hdrlen(rx->fc);
491
492 if (rx->skb->len < 8 + hdrlen)
493 return TXRX_DROP; /* TODO: count this? */
494
495 /*
496 * no need to call ieee80211_wep_get_keyidx,
497 * it verifies a bunch of things we've done already
498 */
499 keyidx = rx->skb->data[hdrlen + 3] >> 6;
500
d4e46a3d 501 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
3017b80b
JB		 502
503 /*
504 * RSNA-protected unicast frames should always be sent with
505 * pairwise or station-to-station keys, but for WEP we allow
506 * using a key index as well.
507 */
8f20fc24 508 if (rx->key && rx->key->conf.alg != ALG_WEP &&
3017b80b
JB		 509 !is_multicast_ether_addr(hdr->addr1))
510 rx->key = NULL;
571ecf67
JB		 511 }
512
3017b80b 513 if (rx->key) {
571ecf67 514 rx->key->tx_rx_count++;
011bfcc4 515 /* TODO: add threshold stuff again */
571ecf67
JB		 516 }
517
518 return TXRX_CONTINUE;
519}
520
521static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
522{
523 struct ieee80211_sub_if_data *sdata;
0795af57
JP		 524 DECLARE_MAC_BUF(mac);
525
571ecf67
JB		 526 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
527
528 if (sdata->bss)
529 atomic_inc(&sdata->bss->num_sta_ps);
530 sta->flags |= WLAN_STA_PS;
531 sta->pspoll = 0;
532#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57
JP		 533 printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
534 dev->name, print_mac(mac, sta->addr), sta->aid);
571ecf67
JB		 535#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
536}
537
538static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
539{
540 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
541 struct sk_buff *skb;
542 int sent = 0;
543 struct ieee80211_sub_if_data *sdata;
544 struct ieee80211_tx_packet_data *pkt_data;
0795af57 545 DECLARE_MAC_BUF(mac);
571ecf67
JB		 546
547 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
548 if (sdata->bss)
549 atomic_dec(&sdata->bss->num_sta_ps);
550 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
551 sta->pspoll = 0;
552 if (!skb_queue_empty(&sta->ps_tx_buf)) {
553 if (local->ops->set_tim)
554 local->ops->set_tim(local_to_hw(local), sta->aid, 0);
555 if (sdata->bss)
556 bss_tim_clear(local, sdata->bss, sta->aid);
557 }
558#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57
JP		 559 printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
560 dev->name, print_mac(mac, sta->addr), sta->aid);
571ecf67
JB		 561#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
562 /* Send all buffered frames to the station */
563 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
564 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
565 sent++;
e8bf9649 566 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
571ecf67
JB		 567 dev_queue_xmit(skb);
568 }
569 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
570 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
571 local->total_ps_buffered--;
572 sent++;
573#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57 574 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
571ecf67 575 "since STA not sleeping anymore\n", dev->name,
0795af57 576 print_mac(mac, sta->addr), sta->aid);
571ecf67 577#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
e8bf9649 578 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
571ecf67
JB		 579 dev_queue_xmit(skb);
580 }
581
582 return sent;
583}
584
585static ieee80211_txrx_result
586ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
587{
588 struct sta_info *sta = rx->sta;
589 struct net_device *dev = rx->dev;
590 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
591
592 if (!sta)
593 return TXRX_CONTINUE;
594
595 /* Update last_rx only for IBSS packets which are for the current
596 * BSSID to avoid keeping the current IBSS network alive in cases where
597 * other STAs are using different BSSID. */
598 if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
599 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
600 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
601 sta->last_rx = jiffies;
602 } else
603 if (!is_multicast_ether_addr(hdr->addr1) ||
604 rx->sdata->type == IEEE80211_IF_TYPE_STA) {
605 /* Update last_rx only for unicast frames in order to prevent
606 * the Probe Request frames (the only broadcast frames from a
607 * STA in infrastructure mode) from keeping a connection alive.
608 */
609 sta->last_rx = jiffies;
610 }
611
badffb72 612 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
571ecf67
JB		 613 return TXRX_CONTINUE;
614
615 sta->rx_fragments++;
616 sta->rx_bytes += rx->skb->len;
6c55aa97
LF		 617 sta->last_rssi = rx->u.rx.status->ssi;
618 sta->last_signal = rx->u.rx.status->signal;
619 sta->last_noise = rx->u.rx.status->noise;
571ecf67
JB		 620
621 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
622 /* Change STA power saving mode only in the end of a frame
623 * exchange sequence */
624 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
625 rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
626 else if (!(sta->flags & WLAN_STA_PS) &&
627 (rx->fc & IEEE80211_FCTL_PM))
628 ap_sta_ps_start(dev, sta);
629 }
630
631 /* Drop data::nullfunc frames silently, since they are used only to
632 * control station power saving mode. */
633 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
634 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
635 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
636 /* Update counter and free packet here to avoid counting this
637 * as a dropped packed. */
638 sta->rx_packets++;
639 dev_kfree_skb(rx->skb);
640 return TXRX_QUEUED;
641 }
642
643 return TXRX_CONTINUE;
644} /* ieee80211_rx_h_sta_process */
645
646static ieee80211_txrx_result
647ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
648{
649 if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
650 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
8f20fc24 651 !rx->key || rx->key->conf.alg != ALG_WEP ||
badffb72 652 !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
571ecf67
JB		 653 return TXRX_CONTINUE;
654
655 /* Check for weak IVs, if hwaccel did not remove IV from the frame */
7848ba7d
JB		 656 if (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) ||
657 !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED))
8f20fc24 658 if (ieee80211_wep_is_weak_iv(rx->skb, rx->key))
571ecf67 659 rx->sta->wep_weak_iv_count++;
571ecf67
JB		 660
661 return TXRX_CONTINUE;
662}
663
664static ieee80211_txrx_result
4f0d18e2 665ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
571ecf67 666{
4f0d18e2 667 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
571ecf67
JB		 668 return TXRX_CONTINUE;
669
670 if (!rx->key) {
1a84f3fd 671 if (net_ratelimit())
4f0d18e2
JB		 672 printk(KERN_DEBUG "%s: RX protected frame,"
673 " but have no key\n", rx->dev->name);
571ecf67
JB		 674 return TXRX_DROP;
675 }
676
4f0d18e2
JB		 677 switch (rx->key->conf.alg) {
678 case ALG_WEP:
679 return ieee80211_crypto_wep_decrypt(rx);
680 case ALG_TKIP:
681 return ieee80211_crypto_tkip_decrypt(rx);
682 case ALG_CCMP:
683 return ieee80211_crypto_ccmp_decrypt(rx);
684 case ALG_NONE:
685 return TXRX_CONTINUE;
571ecf67
JB		 686 }
687
4f0d18e2
JB		 688 /* not reached */
689 WARN_ON(1);
690 return TXRX_DROP;
571ecf67
JB		 691}
692
693static inline struct ieee80211_fragment_entry *
694ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
695 unsigned int frag, unsigned int seq, int rx_queue,
696 struct sk_buff **skb)
697{
698 struct ieee80211_fragment_entry *entry;
699 int idx;
700
701 idx = sdata->fragment_next;
702 entry = &sdata->fragments[sdata->fragment_next++];
703 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
704 sdata->fragment_next = 0;
705
706 if (!skb_queue_empty(&entry->skb_list)) {
707#ifdef CONFIG_MAC80211_DEBUG
708 struct ieee80211_hdr *hdr =
709 (struct ieee80211_hdr *) entry->skb_list.next->data;
0795af57
JP		 710 DECLARE_MAC_BUF(mac);
711 DECLARE_MAC_BUF(mac2);
571ecf67
JB		 712 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
713 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0795af57 714 "addr1=%s addr2=%s\n",
571ecf67
JB		 715 sdata->dev->name, idx,
716 jiffies - entry->first_frag_time, entry->seq,
0795af57
JP		 717 entry->last_frag, print_mac(mac, hdr->addr1),
718 print_mac(mac2, hdr->addr2));
571ecf67
JB		 719#endif /* CONFIG_MAC80211_DEBUG */
720 __skb_queue_purge(&entry->skb_list);
721 }
722
723 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
724 *skb = NULL;
725 entry->first_frag_time = jiffies;
726 entry->seq = seq;
727 entry->rx_queue = rx_queue;
728 entry->last_frag = frag;
729 entry->ccmp = 0;
730 entry->extra_len = 0;
731
732 return entry;
733}
734
735static inline struct ieee80211_fragment_entry *
736ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
737 u16 fc, unsigned int frag, unsigned int seq,
738 int rx_queue, struct ieee80211_hdr *hdr)
739{
740 struct ieee80211_fragment_entry *entry;
741 int i, idx;
742
743 idx = sdata->fragment_next;
744 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
745 struct ieee80211_hdr *f_hdr;
746 u16 f_fc;
747
748 idx--;
749 if (idx < 0)
750 idx = IEEE80211_FRAGMENT_MAX - 1;
751
752 entry = &sdata->fragments[idx];
753 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
754 entry->rx_queue != rx_queue ||
755 entry->last_frag + 1 != frag)
756 continue;
757
758 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
759 f_fc = le16_to_cpu(f_hdr->frame_control);
760
761 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
762 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
763 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
764 continue;
765
766 if (entry->first_frag_time + 2 * HZ < jiffies) {
767 __skb_queue_purge(&entry->skb_list);
768 continue;
769 }
770 return entry;
771 }
772
773 return NULL;
774}
775
776static ieee80211_txrx_result
777ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
778{
779 struct ieee80211_hdr *hdr;
780 u16 sc;
781 unsigned int frag, seq;
782 struct ieee80211_fragment_entry *entry;
783 struct sk_buff *skb;
0795af57 784 DECLARE_MAC_BUF(mac);
571ecf67
JB		 785
786 hdr = (struct ieee80211_hdr *) rx->skb->data;
787 sc = le16_to_cpu(hdr->seq_ctrl);
788 frag = sc & IEEE80211_SCTL_FRAG;
789
790 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
791 (rx->skb)->len < 24 ||
792 is_multicast_ether_addr(hdr->addr1))) {
793 /* not fragmented */
794 goto out;
795 }
796 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
797
798 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
799
800 if (frag == 0) {
801 /* This is the first fragment of a new frame. */
802 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
803 rx->u.rx.queue, &(rx->skb));
8f20fc24 804 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
571ecf67
JB		 805 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
806 /* Store CCMP PN so that we can verify that the next
807 * fragment has a sequential PN value. */
808 entry->ccmp = 1;
809 memcpy(entry->last_pn,
810 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
811 CCMP_PN_LEN);
812 }
813 return TXRX_QUEUED;
814 }
815
816 /* This is a fragment for a frame that should already be pending in
817 * fragment cache. Add this fragment to the end of the pending entry.
818 */
819 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
820 rx->u.rx.queue, hdr);
821 if (!entry) {
822 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
823 return TXRX_DROP;
824 }
825
826 /* Verify that MPDUs within one MSDU have sequential PN values.
827 * (IEEE 802.11i, 8.3.3.4.5) */
828 if (entry->ccmp) {
829 int i;
830 u8 pn[CCMP_PN_LEN], *rpn;
8f20fc24 831 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
571ecf67
JB		 832 return TXRX_DROP;
833 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
834 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
835 pn[i]++;
836 if (pn[i])
837 break;
838 }
839 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
840 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
1a84f3fd
JB		 841 if (net_ratelimit())
842 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
0795af57 843 "sequential A2=%s"
1a84f3fd
JB		 844 " PN=%02x%02x%02x%02x%02x%02x "
845 "(expected %02x%02x%02x%02x%02x%02x)\n",
0795af57 846 rx->dev->name, print_mac(mac, hdr->addr2),
1a84f3fd
JB		 847 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
848 rpn[5], pn[0], pn[1], pn[2], pn[3],
849 pn[4], pn[5]);
571ecf67
JB		 850 return TXRX_DROP;
851 }
852 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
853 }
854
855 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
856 __skb_queue_tail(&entry->skb_list, rx->skb);
857 entry->last_frag = frag;
858 entry->extra_len += rx->skb->len;
859 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
860 rx->skb = NULL;
861 return TXRX_QUEUED;
862 }
863
864 rx->skb = __skb_dequeue(&entry->skb_list);
865 if (skb_tailroom(rx->skb) < entry->extra_len) {
866 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
867 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
868 GFP_ATOMIC))) {
869 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
870 __skb_queue_purge(&entry->skb_list);
871 return TXRX_DROP;
872 }
873 }
874 while ((skb = __skb_dequeue(&entry->skb_list))) {
875 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
876 dev_kfree_skb(skb);
877 }
878
879 /* Complete frame has been reassembled - process it now */
badffb72 880 rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
571ecf67
JB		 881
882 out:
883 if (rx->sta)
884 rx->sta->rx_packets++;
885 if (is_multicast_ether_addr(hdr->addr1))
886 rx->local->dot11MulticastReceivedFrameCount++;
887 else
888 ieee80211_led_rx(rx->local);
889 return TXRX_CONTINUE;
890}
891
892static ieee80211_txrx_result
893ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
894{
895 struct sk_buff *skb;
896 int no_pending_pkts;
0795af57 897 DECLARE_MAC_BUF(mac);
571ecf67
JB		 898
899 if (likely(!rx->sta ||
900 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
901 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
badffb72 902 !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
571ecf67
JB		 903 return TXRX_CONTINUE;
904
905 skb = skb_dequeue(&rx->sta->tx_filtered);
906 if (!skb) {
907 skb = skb_dequeue(&rx->sta->ps_tx_buf);
908 if (skb)
909 rx->local->total_ps_buffered--;
910 }
911 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
912 skb_queue_empty(&rx->sta->ps_tx_buf);
913
914 if (skb) {
915 struct ieee80211_hdr *hdr =
916 (struct ieee80211_hdr *) skb->data;
917
918 /* tell TX path to send one frame even though the STA may
919 * still remain is PS mode after this frame exchange */
920 rx->sta->pspoll = 1;
921
922#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57
JP		 923 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
924 print_mac(mac, rx->sta->addr), rx->sta->aid,
571ecf67
JB		 925 skb_queue_len(&rx->sta->ps_tx_buf));
926#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
927
928 /* Use MoreData flag to indicate whether there are more
929 * buffered frames for this STA */
930 if (no_pending_pkts) {
931 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
932 rx->sta->flags &= ~WLAN_STA_TIM;
933 } else
934 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
935
936 dev_queue_xmit(skb);
937
938 if (no_pending_pkts) {
939 if (rx->local->ops->set_tim)
940 rx->local->ops->set_tim(local_to_hw(rx->local),
941 rx->sta->aid, 0);
942 if (rx->sdata->bss)
943 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
944 }
945#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
946 } else if (!rx->u.rx.sent_ps_buffered) {
0795af57 947 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
571ecf67 948 "though there is no buffered frames for it\n",
0795af57 949 rx->dev->name, print_mac(mac, rx->sta->addr));
571ecf67
JB		 950#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
951
952 }
953
954 /* Free PS Poll skb here instead of returning TXRX_DROP that would
955 * count as an dropped frame. */
956 dev_kfree_skb(rx->skb);
957
958 return TXRX_QUEUED;
959}
960
6e0d114d
JB		 961static ieee80211_txrx_result
962ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
963{
964 u16 fc = rx->fc;
965 u8 *data = rx->skb->data;
966 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
967
968 if (!WLAN_FC_IS_QOS_DATA(fc))
969 return TXRX_CONTINUE;
970
971 /* remove the qos control field, update frame type and meta-data */
972 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
973 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
974 /* change frame type to non QOS */
975 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
976 hdr->frame_control = cpu_to_le16(fc);
977
978 return TXRX_CONTINUE;
979}
980
571ecf67
JB		 981static ieee80211_txrx_result
982ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
983{
984 if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
badffb72
JS		 985 rx->sdata->type != IEEE80211_IF_TYPE_STA &&
986 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
571ecf67
JB		 987 /* Pass both encrypted and unencrypted EAPOL frames to user
988 * space for processing. */
989 if (!rx->local->apdev)
990 return TXRX_DROP;
991 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
992 ieee80211_msg_normal);
993 return TXRX_QUEUED;
994 }
995
996 if (unlikely(rx->sdata->ieee802_1x &&
997 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
998 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
999 (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
1000 !ieee80211_is_eapol(rx->skb))) {
1001#ifdef CONFIG_MAC80211_DEBUG
1002 struct ieee80211_hdr *hdr =
1003 (struct ieee80211_hdr *) rx->skb->data;
0795af57
JP		 1004 DECLARE_MAC_BUF(mac);
1005 printk(KERN_DEBUG "%s: dropped frame from %s"
571ecf67 1006 " (unauthorized port)\n", rx->dev->name,
0795af57 1007 print_mac(mac, hdr->addr2));
571ecf67
JB		 1008#endif /* CONFIG_MAC80211_DEBUG */
1009 return TXRX_DROP;
1010 }
1011
1012 return TXRX_CONTINUE;
1013}
1014
1015static ieee80211_txrx_result
1016ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
1017{
3017b80b 1018 /*
7848ba7d
JB		 1019 * Pass through unencrypted frames if the hardware has
1020 * decrypted them already.
3017b80b 1021 */
7848ba7d 1022 if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED)
571ecf67
JB		 1023 return TXRX_CONTINUE;
1024
1025 /* Drop unencrypted frames if key is set. */
1026 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
1027 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
1028 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
1029 (rx->key || rx->sdata->drop_unencrypted) &&
1030 (rx->sdata->eapol == 0 ||
1031 !ieee80211_is_eapol(rx->skb)))) {
1a84f3fd
JB		 1032 if (net_ratelimit())
1033 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
1034 "encryption\n", rx->dev->name);
571ecf67
JB		 1035 return TXRX_DROP;
1036 }
1037 return TXRX_CONTINUE;
1038}
1039
1040static ieee80211_txrx_result
1041ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
1042{
1043 struct net_device *dev = rx->dev;
1044 struct ieee80211_local *local = rx->local;
1045 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1046 u16 fc, hdrlen, ethertype;
1047 u8 *payload;
1048 u8 dst[ETH_ALEN];
1049 u8 src[ETH_ALEN];
1050 struct sk_buff *skb = rx->skb, *skb2;
1051 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
0795af57
JP		 1052 DECLARE_MAC_BUF(mac);
1053 DECLARE_MAC_BUF(mac2);
1054 DECLARE_MAC_BUF(mac3);
1055 DECLARE_MAC_BUF(mac4);
571ecf67
JB		 1056
1057 fc = rx->fc;
1058 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1059 return TXRX_CONTINUE;
1060
1061 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1062 return TXRX_DROP;
1063
1064 hdrlen = ieee80211_get_hdrlen(fc);
1065
1066 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1067 * header
1068 * IEEE 802.11 address fields:
1069 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1070 * 0 0 DA SA BSSID n/a
1071 * 0 1 DA BSSID SA n/a
1072 * 1 0 BSSID SA DA n/a
1073 * 1 1 RA TA DA SA
1074 */
1075
1076 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1077 case IEEE80211_FCTL_TODS:
1078 /* BSSID SA DA */
1079 memcpy(dst, hdr->addr3, ETH_ALEN);
1080 memcpy(src, hdr->addr2, ETH_ALEN);
1081
1082 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
1083 sdata->type != IEEE80211_IF_TYPE_VLAN)) {
1a84f3fd
JB		 1084 if (net_ratelimit())
1085 printk(KERN_DEBUG "%s: dropped ToDS frame "
0795af57 1086 "(BSSID=%s SA=%s DA=%s)\n",
1a84f3fd 1087 dev->name,
0795af57
JP		 1088 print_mac(mac, hdr->addr1),
1089 print_mac(mac2, hdr->addr2),
1090 print_mac(mac3, hdr->addr3));
571ecf67
JB		 1091 return TXRX_DROP;
1092 }
1093 break;
1094 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1095 /* RA TA DA SA */
1096 memcpy(dst, hdr->addr3, ETH_ALEN);
1097 memcpy(src, hdr->addr4, ETH_ALEN);
1098
1099 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
1a84f3fd
JB		 1100 if (net_ratelimit())
1101 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
0795af57 1102 "frame (RA=%s TA=%s DA=%s SA=%s)\n",
1a84f3fd 1103 rx->dev->name,
0795af57
JP		 1104 print_mac(mac, hdr->addr1),
1105 print_mac(mac2, hdr->addr2),
1106 print_mac(mac3, hdr->addr3),
1107 print_mac(mac4, hdr->addr4));
571ecf67
JB		 1108 return TXRX_DROP;
1109 }
1110 break;
1111 case IEEE80211_FCTL_FROMDS:
1112 /* DA BSSID SA */
1113 memcpy(dst, hdr->addr1, ETH_ALEN);
1114 memcpy(src, hdr->addr3, ETH_ALEN);
1115
b3316157
JL		 1116 if (sdata->type != IEEE80211_IF_TYPE_STA ||
1117 (is_multicast_ether_addr(dst) &&
1118 !compare_ether_addr(src, dev->dev_addr)))
571ecf67 1119 return TXRX_DROP;
571ecf67
JB		 1120 break;
1121 case 0:
1122 /* DA SA BSSID */
1123 memcpy(dst, hdr->addr1, ETH_ALEN);
1124 memcpy(src, hdr->addr2, ETH_ALEN);
1125
1126 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
1127 if (net_ratelimit()) {
0795af57
JP		 1128 printk(KERN_DEBUG "%s: dropped IBSS frame "
1129 "(DA=%s SA=%s BSSID=%s)\n",
1130 dev->name,
1131 print_mac(mac, hdr->addr1),
1132 print_mac(mac2, hdr->addr2),
1133 print_mac(mac3, hdr->addr3));
571ecf67
JB		 1134 }
1135 return TXRX_DROP;
1136 }
1137 break;
1138 }
1139
1140 payload = skb->data + hdrlen;
1141
1142 if (unlikely(skb->len - hdrlen < 8)) {
1143 if (net_ratelimit()) {
1144 printk(KERN_DEBUG "%s: RX too short data frame "
1145 "payload\n", dev->name);
1146 }
1147 return TXRX_DROP;
1148 }
1149
1150 ethertype = (payload[6] << 8) | payload[7];
1151
1152 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1153 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1154 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1155 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1156 * replace EtherType */
1157 skb_pull(skb, hdrlen + 6);
1158 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1159 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1160 } else {
1161 struct ethhdr *ehdr;
1162 __be16 len;
1163 skb_pull(skb, hdrlen);
1164 len = htons(skb->len);
1165 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1166 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1167 memcpy(ehdr->h_source, src, ETH_ALEN);
1168 ehdr->h_proto = len;
1169 }
1170 skb->dev = dev;
1171
1172 skb2 = NULL;
1173
68aae116
SH		 1174 dev->stats.rx_packets++;
1175 dev->stats.rx_bytes += skb->len;
571ecf67
JB		 1176
1177 if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
badffb72
JS		 1178 || sdata->type == IEEE80211_IF_TYPE_VLAN) &&
1179 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
571ecf67
JB		 1180 if (is_multicast_ether_addr(skb->data)) {
1181 /* send multicast frames both to higher layers in
1182 * local net stack and back to the wireless media */
1183 skb2 = skb_copy(skb, GFP_ATOMIC);
1a84f3fd 1184 if (!skb2 && net_ratelimit())
571ecf67
JB		 1185 printk(KERN_DEBUG "%s: failed to clone "
1186 "multicast frame\n", dev->name);
1187 } else {
1188 struct sta_info *dsta;
1189 dsta = sta_info_get(local, skb->data);
1190 if (dsta && !dsta->dev) {
1a84f3fd
JB		 1191 if (net_ratelimit())
1192 printk(KERN_DEBUG "Station with null "
1193 "dev structure!\n");
571ecf67
JB		 1194 } else if (dsta && dsta->dev == dev) {
1195 /* Destination station is associated to this
1196 * AP, so send the frame directly to it and
1197 * do not pass the frame to local net stack.
1198 */
1199 skb2 = skb;
1200 skb = NULL;
1201 }
1202 if (dsta)
1203 sta_info_put(dsta);
1204 }
1205 }
1206
1207 if (skb) {
1208 /* deliver to local stack */
1209 skb->protocol = eth_type_trans(skb, dev);
1210 memset(skb->cb, 0, sizeof(skb->cb));
1211 netif_rx(skb);
1212 }
1213
1214 if (skb2) {
1215 /* send to wireless media */
1216 skb2->protocol = __constant_htons(ETH_P_802_3);
1217 skb_set_network_header(skb2, 0);
1218 skb_set_mac_header(skb2, 0);
1219 dev_queue_xmit(skb2);
1220 }
1221
1222 return TXRX_QUEUED;
1223}
1224
1225static ieee80211_txrx_result
1226ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1227{
1228 struct ieee80211_sub_if_data *sdata;
1229
badffb72 1230 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
571ecf67
JB		 1231 return TXRX_DROP;
1232
1233 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1234 if ((sdata->type == IEEE80211_IF_TYPE_STA ||
1235 sdata->type == IEEE80211_IF_TYPE_IBSS) &&
1236 !rx->local->user_space_mlme) {
1237 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1238 } else {
1239 /* Management frames are sent to hostapd for processing */
1240 if (!rx->local->apdev)
1241 return TXRX_DROP;
1242 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
1243 ieee80211_msg_normal);
1244 }
1245 return TXRX_QUEUED;
1246}
1247
1248static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1249 struct ieee80211_local *local,
1250 ieee80211_rx_handler *handlers,
1251 struct ieee80211_txrx_data *rx,
1252 struct sta_info *sta)
1253{
1254 ieee80211_rx_handler *handler;
1255 ieee80211_txrx_result res = TXRX_DROP;
1256
1257 for (handler = handlers; *handler != NULL; handler++) {
1258 res = (*handler)(rx);
8e6f0032
JB		 1259
1260 switch (res) {
1261 case TXRX_CONTINUE:
1262 continue;
1263 case TXRX_DROP:
1264 I802_DEBUG_INC(local->rx_handlers_drop);
1265 if (sta)
1266 sta->rx_dropped++;
1267 break;
1268 case TXRX_QUEUED:
1269 I802_DEBUG_INC(local->rx_handlers_queued);
571ecf67
JB		 1270 break;
1271 }
8e6f0032 1272 break;
571ecf67
JB		 1273 }
1274
8e6f0032 1275 if (res == TXRX_DROP)
571ecf67 1276 dev_kfree_skb(rx->skb);
571ecf67
JB		 1277 return res;
1278}
1279
1280static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1281 ieee80211_rx_handler *handlers,
1282 struct ieee80211_txrx_data *rx,
1283 struct sta_info *sta)
1284{
1285 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1286 TXRX_CONTINUE)
1287 dev_kfree_skb(rx->skb);
1288}
1289
1290static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1291 struct ieee80211_hdr *hdr,
1292 struct sta_info *sta,
1293 struct ieee80211_txrx_data *rx)
1294{
1295 int keyidx, hdrlen;
0795af57
JP		 1296 DECLARE_MAC_BUF(mac);
1297 DECLARE_MAC_BUF(mac2);
571ecf67
JB		 1298
1299 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1300 if (rx->skb->len >= hdrlen + 4)
1301 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1302 else
1303 keyidx = -1;
1304
1a84f3fd
JB		 1305 if (net_ratelimit())
1306 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
0795af57
JP		 1307 "failure from %s to %s keyidx=%d\n",
1308 dev->name, print_mac(mac, hdr->addr2),
1309 print_mac(mac2, hdr->addr1), keyidx);
571ecf67
JB		 1310
1311 if (!sta) {
aa0daf0e
JB		 1312 /*
1313 * Some hardware seem to generate incorrect Michael MIC
1314 * reports; ignore them to avoid triggering countermeasures.
1315 */
1a84f3fd
JB		 1316 if (net_ratelimit())
1317 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
0795af57
JP		 1318 "error for unknown address %s\n",
1319 dev->name, print_mac(mac, hdr->addr2));
571ecf67
JB		 1320 goto ignore;
1321 }
1322
1323 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1a84f3fd
JB		 1324 if (net_ratelimit())
1325 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
aa0daf0e 1326 "error for a frame with no PROTECTED flag (src "
0795af57 1327 "%s)\n", dev->name, print_mac(mac, hdr->addr2));
571ecf67
JB		 1328 goto ignore;
1329 }
1330
7848ba7d 1331 if (rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) {
aa0daf0e
JB		 1332 /*
1333 * APs with pairwise keys should never receive Michael MIC
1334 * errors for non-zero keyidx because these are reserved for
1335 * group keys and only the AP is sending real multicast
1336 * frames in the BSS.
1337 */
eb063c17
JB		 1338 if (net_ratelimit())
1339 printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1340 "a frame with non-zero keyidx (%d)"
0795af57
JP		 1341 " (src %s)\n", dev->name, keyidx,
1342 print_mac(mac, hdr->addr2));
eb063c17 1343 goto ignore;
571ecf67
JB		 1344 }
1345
1346 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1347 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1348 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1a84f3fd
JB		 1349 if (net_ratelimit())
1350 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1351 "error for a frame that cannot be encrypted "
0795af57
JP		 1352 "(fc=0x%04x) (src %s)\n",
1353 dev->name, rx->fc, print_mac(mac, hdr->addr2));
571ecf67
JB		 1354 goto ignore;
1355 }
1356
eb063c17 1357 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
571ecf67
JB		 1358 ignore:
1359 dev_kfree_skb(rx->skb);
1360 rx->skb = NULL;
1361}
1362
1363ieee80211_rx_handler ieee80211_rx_handlers[] =
1364{
1365 ieee80211_rx_h_if_stats,
571ecf67
JB		 1366 ieee80211_rx_h_passive_scan,
1367 ieee80211_rx_h_check,
570bd537 1368 ieee80211_rx_h_load_key,
571ecf67 1369 ieee80211_rx_h_sta_process,
571ecf67 1370 ieee80211_rx_h_wep_weak_iv_detection,
4f0d18e2 1371 ieee80211_rx_h_decrypt,
571ecf67
JB		 1372 ieee80211_rx_h_defragment,
1373 ieee80211_rx_h_ps_poll,
1374 ieee80211_rx_h_michael_mic_verify,
1375 /* this must be after decryption - so header is counted in MPDU mic
1376 * must be before pae and data, so QOS_DATA format frames
1377 * are not passed to user space by these functions
1378 */
1379 ieee80211_rx_h_remove_qos_control,
1380 ieee80211_rx_h_802_1x_pae,
1381 ieee80211_rx_h_drop_unencrypted,
1382 ieee80211_rx_h_data,
1383 ieee80211_rx_h_mgmt,
1384 NULL
1385};
1386
1387/* main receive path */
1388
23a24def
JB		 1389static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1390 u8 *bssid, struct ieee80211_txrx_data *rx,
1391 struct ieee80211_hdr *hdr)
1392{
1393 int multicast = is_multicast_ether_addr(hdr->addr1);
1394
1395 switch (sdata->type) {
1396 case IEEE80211_IF_TYPE_STA:
1397 if (!bssid)
1398 return 0;
1399 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
badffb72 1400 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
23a24def 1401 return 0;
badffb72 1402 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
23a24def
JB		 1403 } else if (!multicast &&
1404 compare_ether_addr(sdata->dev->dev_addr,
1405 hdr->addr1) != 0) {
4150c572 1406 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 1407 return 0;
badffb72 1408 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
23a24def
JB		 1409 }
1410 break;
1411 case IEEE80211_IF_TYPE_IBSS:
1412 if (!bssid)
1413 return 0;
1414 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
badffb72 1415 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
23a24def 1416 return 0;
badffb72 1417 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
23a24def
JB		 1418 } else if (!multicast &&
1419 compare_ether_addr(sdata->dev->dev_addr,
1420 hdr->addr1) != 0) {
4150c572 1421 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 1422 return 0;
badffb72 1423 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
23a24def
JB		 1424 } else if (!rx->sta)
1425 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1426 bssid, hdr->addr2);
1427 break;
1428 case IEEE80211_IF_TYPE_AP:
1429 if (!bssid) {
1430 if (compare_ether_addr(sdata->dev->dev_addr,
1431 hdr->addr1))
1432 return 0;
1433 } else if (!ieee80211_bssid_match(bssid,
1434 sdata->dev->dev_addr)) {
badffb72 1435 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
23a24def 1436 return 0;
badffb72 1437 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
23a24def 1438 }
badffb72
JS		 1439 if (sdata->dev == sdata->local->mdev &&
1440 !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
23a24def
JB		 1441 /* do not receive anything via
1442 * master device when not scanning */
1443 return 0;
1444 break;
1445 case IEEE80211_IF_TYPE_WDS:
1446 if (bssid ||
1447 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1448 return 0;
1449 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1450 return 0;
1451 break;
1452 }
1453
1454 return 1;
1455}
1456
571ecf67
JB		 1457/*
1458 * This is the receive path handler. It is called by a low level driver when an
1459 * 802.11 MPDU is received from the hardware.
1460 */
1461void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1462 struct ieee80211_rx_status *status)
1463{
1464 struct ieee80211_local *local = hw_to_local(hw);
1465 struct ieee80211_sub_if_data *sdata;
1466 struct sta_info *sta;
1467 struct ieee80211_hdr *hdr;
1468 struct ieee80211_txrx_data rx;
1469 u16 type;
b2e7771e 1470 int prepres;
8e6f0032
JB		 1471 struct ieee80211_sub_if_data *prev = NULL;
1472 struct sk_buff *skb_new;
1473 u8 *bssid;
571ecf67 1474
d4e46a3d 1475 /*
79010420
JB		 1476 * key references and virtual interfaces are protected using RCU
1477 * and this requires that we are in a read-side RCU section during
1478 * receive processing
d4e46a3d
JB		 1479 */
1480 rcu_read_lock();
1481
b2e7771e
JB		 1482 /*
1483 * Frames with failed FCS/PLCP checksum are not returned,
1484 * all other frames are returned without radiotap header
1485 * if it was previously present.
1486 * Also, frames with less than 16 bytes are dropped.
1487 */
1488 skb = ieee80211_rx_monitor(local, skb, status);
1489 if (!skb) {
1490 rcu_read_unlock();
1491 return;
1492 }
1493
571ecf67
JB		 1494 hdr = (struct ieee80211_hdr *) skb->data;
1495 memset(&rx, 0, sizeof(rx));
1496 rx.skb = skb;
1497 rx.local = local;
1498
1499 rx.u.rx.status = status;
b2e7771e 1500 rx.fc = le16_to_cpu(hdr->frame_control);
571ecf67 1501 type = rx.fc & IEEE80211_FCTL_FTYPE;
72abd81b 1502
b2e7771e 1503 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
571ecf67 1504 local->dot11ReceivedFragmentCount++;
571ecf67 1505
b2e7771e
JB		 1506 sta = rx.sta = sta_info_get(local, hdr->addr2);
1507 if (sta) {
1508 rx.dev = rx.sta->dev;
1509 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1510 }
571ecf67 1511
571ecf67
JB		 1512 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1513 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1514 goto end;
1515 }
1516
1517 if (unlikely(local->sta_scanning))
badffb72 1518 rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
571ecf67
JB		 1519
1520 if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1521 sta) != TXRX_CONTINUE)
1522 goto end;
1523 skb = rx.skb;
1524
c9ee23df 1525 if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) &&
23a24def 1526 !local->iff_promiscs && !is_multicast_ether_addr(hdr->addr1)) {
badffb72 1527 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
571ecf67 1528 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
23a24def 1529 rx.sta);
8e6f0032 1530 sta_info_put(sta);
d4e46a3d 1531 rcu_read_unlock();
8e6f0032
JB		 1532 return;
1533 }
1534
b2e7771e 1535 bssid = ieee80211_get_bssid(hdr, skb->len);
8e6f0032 1536
79010420 1537 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2a8a9a88
JB		 1538 if (!netif_running(sdata->dev))
1539 continue;
1540
b2e7771e
JB		 1541 if (sdata->type == IEEE80211_IF_TYPE_MNTR)
1542 continue;
1543
1544 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
23a24def
JB		 1545 prepres = prepare_for_handlers(sdata, bssid, &rx, hdr);
1546 /* prepare_for_handlers can change sta */
1547 sta = rx.sta;
1548
1549 if (!prepres)
1550 continue;
8e6f0032 1551
340e11f3
JB		 1552 /*
1553 * frame is destined for this interface, but if it's not
1554 * also for the previous one we handle that after the
1555 * loop to avoid copying the SKB once too much
1556 */
1557
1558 if (!prev) {
1559 prev = sdata;
1560 continue;
8e6f0032 1561 }
340e11f3
JB		 1562
1563 /*
1564 * frame was destined for the previous interface
1565 * so invoke RX handlers for it
1566 */
1567
1568 skb_new = skb_copy(skb, GFP_ATOMIC);
1569 if (!skb_new) {
1570 if (net_ratelimit())
1571 printk(KERN_DEBUG "%s: failed to copy "
1572 "multicast frame for %s",
dd1cd4c6
JB		 1573 wiphy_name(local->hw.wiphy),
1574 prev->dev->name);
340e11f3
JB		 1575 continue;
1576 }
1577 rx.skb = skb_new;
1578 rx.dev = prev->dev;
1579 rx.sdata = prev;
1580 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1581 &rx, sta);
8e6f0032 1582 prev = sdata;
571ecf67 1583 }
8e6f0032
JB		 1584 if (prev) {
1585 rx.skb = skb;
1586 rx.dev = prev->dev;
1587 rx.sdata = prev;
1588 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1589 &rx, sta);
1590 } else
1591 dev_kfree_skb(skb);
571ecf67 1592
8e6f0032 1593 end:
d4e46a3d
JB		 1594 rcu_read_unlock();
1595
571ecf67
JB		 1596 if (sta)
1597 sta_info_put(sta);
1598}
1599EXPORT_SYMBOL(__ieee80211_rx);
1600
1601/* This is a version of the rx handler that can be called from hard irq
1602 * context. Post the skb on the queue and schedule the tasklet */
1603void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1604 struct ieee80211_rx_status *status)
1605{
1606 struct ieee80211_local *local = hw_to_local(hw);
1607
1608 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1609
1610 skb->dev = local->mdev;
1611 /* copy status into skb->cb for use by tasklet */
1612 memcpy(skb->cb, status, sizeof(*status));
1613 skb->pkt_type = IEEE80211_RX_MSG;
1614 skb_queue_tail(&local->skb_queue, skb);
1615 tasklet_schedule(&local->tasklet);
1616}
1617EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)