blob: 478d85563bdb0d962385cffd1eb7fd64ff6690b9 [file] [log] [blame]
Johannes Berg571ecf62007-07-27 15:43:22 +02001/*
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>
Johannes Bergd4e46a32007-09-14 11:10:24 -040016#include <linux/rcupdate.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020017#include <net/mac80211.h>
18#include <net/ieee80211_radiotap.h>
19
20#include "ieee80211_i.h"
21#include "ieee80211_led.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020022#include "wep.h"
23#include "wpa.h"
24#include "tkip.h"
25#include "wme.h"
26
Johannes Bergb2e77712007-09-26 15:19:39 +020027/*
28 * monitor mode reception
29 *
30 * This function cleans up the SKB, i.e. it removes all the stuff
31 * only useful for monitoring.
32 */
33static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
34 struct sk_buff *skb,
35 int rtap_len)
36{
37 skb_pull(skb, rtap_len);
38
39 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
40 if (likely(skb->len > FCS_LEN))
41 skb_trim(skb, skb->len - FCS_LEN);
42 else {
43 /* driver bug */
44 WARN_ON(1);
45 dev_kfree_skb(skb);
46 skb = NULL;
47 }
48 }
49
50 return skb;
51}
52
53static inline int should_drop_frame(struct ieee80211_rx_status *status,
54 struct sk_buff *skb,
55 int present_fcs_len,
56 int radiotap_len)
57{
58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
59
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 return 1;
62 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
63 return 1;
64 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FTYPE)) ==
65 cpu_to_le16(IEEE80211_FTYPE_CTL))
66 return 1;
67 return 0;
68}
69
70/*
71 * This function copies a received frame to all monitor interfaces and
72 * returns a cleaned-up SKB that no longer includes the FCS nor the
73 * radiotap header the driver might have added.
74 */
75static struct sk_buff *
76ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
77 struct ieee80211_rx_status *status)
78{
79 struct ieee80211_sub_if_data *sdata;
80 struct ieee80211_rate *rate;
81 int needed_headroom = 0;
82 struct ieee80211_rtap_hdr {
83 struct ieee80211_radiotap_header hdr;
84 u8 flags;
85 u8 rate;
86 __le16 chan_freq;
87 __le16 chan_flags;
88 u8 antsignal;
89 u8 padding_for_rxflags;
90 __le16 rx_flags;
91 } __attribute__ ((packed)) *rthdr;
92 struct sk_buff *skb, *skb2;
93 struct net_device *prev_dev = NULL;
94 int present_fcs_len = 0;
95 int rtap_len = 0;
96
97 /*
98 * First, we may need to make a copy of the skb because
99 * (1) we need to modify it for radiotap (if not present), and
100 * (2) the other RX handlers will modify the skb we got.
101 *
102 * We don't need to, of course, if we aren't going to return
103 * the SKB because it has a bad FCS/PLCP checksum.
104 */
105 if (status->flag & RX_FLAG_RADIOTAP)
106 rtap_len = ieee80211_get_radiotap_len(origskb->data);
107 else
108 needed_headroom = sizeof(*rthdr);
109
110 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
111 present_fcs_len = FCS_LEN;
112
113 if (!local->monitors) {
114 if (should_drop_frame(status, origskb, present_fcs_len,
115 rtap_len)) {
116 dev_kfree_skb(origskb);
117 return NULL;
118 }
119
120 return remove_monitor_info(local, origskb, rtap_len);
121 }
122
123 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
124 /* only need to expand headroom if necessary */
125 skb = origskb;
126 origskb = NULL;
127
128 /*
129 * This shouldn't trigger often because most devices have an
130 * RX header they pull before we get here, and that should
131 * be big enough for our radiotap information. We should
132 * probably export the length to drivers so that we can have
133 * them allocate enough headroom to start with.
134 */
135 if (skb_headroom(skb) < needed_headroom &&
136 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
137 dev_kfree_skb(skb);
138 return NULL;
139 }
140 } else {
141 /*
142 * Need to make a copy and possibly remove radiotap header
143 * and FCS from the original.
144 */
145 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
146
147 origskb = remove_monitor_info(local, origskb, rtap_len);
148
149 if (!skb)
150 return origskb;
151 }
152
153 /* if necessary, prepend radiotap information */
154 if (!(status->flag & RX_FLAG_RADIOTAP)) {
155 rthdr = (void *) skb_push(skb, sizeof(*rthdr));
156 memset(rthdr, 0, sizeof(*rthdr));
157 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
158 rthdr->hdr.it_present =
159 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
160 (1 << IEEE80211_RADIOTAP_RATE) |
161 (1 << IEEE80211_RADIOTAP_CHANNEL) |
162 (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL) |
163 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
164 rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
165 IEEE80211_RADIOTAP_F_FCS : 0;
166
167 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
168 rthdr->rx_flags = 0;
169 if (status->flag &
170 (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
171 rthdr->rx_flags |=
172 cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
173
174 rate = ieee80211_get_rate(local, status->phymode,
175 status->rate);
176 if (rate)
177 rthdr->rate = rate->rate / 5;
178
179 rthdr->chan_freq = cpu_to_le16(status->freq);
180
181 if (status->phymode == MODE_IEEE80211A)
182 rthdr->chan_flags =
183 cpu_to_le16(IEEE80211_CHAN_OFDM |
184 IEEE80211_CHAN_5GHZ);
185 else
186 rthdr->chan_flags =
187 cpu_to_le16(IEEE80211_CHAN_DYN |
188 IEEE80211_CHAN_2GHZ);
189
190 rthdr->antsignal = status->ssi;
191 }
192
193 skb_set_mac_header(skb, 0);
194 skb->ip_summed = CHECKSUM_UNNECESSARY;
195 skb->pkt_type = PACKET_OTHERHOST;
196 skb->protocol = htons(ETH_P_802_2);
197
198 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
199 if (!netif_running(sdata->dev))
200 continue;
201
202 if (sdata->type != IEEE80211_IF_TYPE_MNTR)
203 continue;
204
205 if (prev_dev) {
206 skb2 = skb_clone(skb, GFP_ATOMIC);
207 if (skb2) {
208 skb2->dev = prev_dev;
209 netif_rx(skb2);
210 }
211 }
212
213 prev_dev = sdata->dev;
214 sdata->dev->stats.rx_packets++;
215 sdata->dev->stats.rx_bytes += skb->len;
216 }
217
218 if (prev_dev) {
219 skb->dev = prev_dev;
220 netif_rx(skb);
221 } else
222 dev_kfree_skb(skb);
223
224 return origskb;
225}
226
227
Johannes Berg571ecf62007-07-27 15:43:22 +0200228/* pre-rx handlers
229 *
230 * these don't have dev/sdata fields in the rx data
Johannes Berg52865df2007-07-27 15:43:22 +0200231 * The sta value should also not be used because it may
232 * be NULL even though a STA (in IBSS mode) will be added.
Johannes Berg571ecf62007-07-27 15:43:22 +0200233 */
234
235static ieee80211_txrx_result
Johannes Berg6e0d1142007-07-27 15:43:22 +0200236ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
237{
238 u8 *data = rx->skb->data;
239 int tid;
240
241 /* does the frame have a qos control field? */
242 if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
243 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
244 /* frame has qos control */
245 tid = qc[0] & QOS_CONTROL_TID_MASK;
246 } else {
247 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
248 /* Separate TID for management frames */
249 tid = NUM_RX_DATA_QUEUES - 1;
250 } else {
251 /* no qos control present */
252 tid = 0; /* 802.1d - Best Effort */
253 }
254 }
Johannes Berg52865df2007-07-27 15:43:22 +0200255
Johannes Berg6e0d1142007-07-27 15:43:22 +0200256 I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
Johannes Berg52865df2007-07-27 15:43:22 +0200257 /* only a debug counter, sta might not be assigned properly yet */
258 if (rx->sta)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200259 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200260
261 rx->u.rx.queue = tid;
262 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
263 * For now, set skb->priority to 0 for other cases. */
264 rx->skb->priority = (tid > 7) ? 0 : tid;
265
266 return TXRX_CONTINUE;
267}
268
269static ieee80211_txrx_result
Johannes Berg571ecf62007-07-27 15:43:22 +0200270ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
271{
272 struct ieee80211_local *local = rx->local;
273 struct sk_buff *skb = rx->skb;
274 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
275 u32 load = 0, hdrtime;
276 struct ieee80211_rate *rate;
277 struct ieee80211_hw_mode *mode = local->hw.conf.mode;
278 int i;
279
280 /* Estimate total channel use caused by this frame */
281
282 if (unlikely(mode->num_rates < 0))
283 return TXRX_CONTINUE;
284
285 rate = &mode->rates[0];
286 for (i = 0; i < mode->num_rates; i++) {
287 if (mode->rates[i].val == rx->u.rx.status->rate) {
288 rate = &mode->rates[i];
289 break;
290 }
291 }
292
293 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
294 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
295
296 if (mode->mode == MODE_IEEE80211A ||
Johannes Berg571ecf62007-07-27 15:43:22 +0200297 (mode->mode == MODE_IEEE80211G &&
298 rate->flags & IEEE80211_RATE_ERP))
299 hdrtime = CHAN_UTIL_HDR_SHORT;
300 else
301 hdrtime = CHAN_UTIL_HDR_LONG;
302
303 load = hdrtime;
304 if (!is_multicast_ether_addr(hdr->addr1))
305 load += hdrtime;
306
307 load += skb->len * rate->rate_inv;
308
309 /* Divide channel_use by 8 to avoid wrapping around the counter */
310 load >>= CHAN_UTIL_SHIFT;
311 local->channel_use_raw += load;
Johannes Berg571ecf62007-07-27 15:43:22 +0200312 rx->u.rx.load = load;
313
314 return TXRX_CONTINUE;
315}
316
317ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
318{
319 ieee80211_rx_h_parse_qos,
320 ieee80211_rx_h_load_stats,
321 NULL
322};
323
324/* rx handlers */
325
326static ieee80211_txrx_result
327ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
328{
Johannes Berg52865df2007-07-27 15:43:22 +0200329 if (rx->sta)
330 rx->sta->channel_use_raw += rx->u.rx.load;
Johannes Berg571ecf62007-07-27 15:43:22 +0200331 rx->sdata->channel_use_raw += rx->u.rx.load;
332 return TXRX_CONTINUE;
333}
334
Johannes Berg571ecf62007-07-27 15:43:22 +0200335static ieee80211_txrx_result
336ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
337{
338 struct ieee80211_local *local = rx->local;
339 struct sk_buff *skb = rx->skb;
340
Zhu Yiece8edd2007-11-22 10:53:21 +0800341 if (unlikely(local->sta_hw_scanning))
342 return ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
343
344 if (unlikely(local->sta_sw_scanning)) {
345 /* drop all the other packets during a software scan anyway */
346 if (ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status)
347 != TXRX_QUEUED)
348 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200349 return TXRX_QUEUED;
350 }
351
Jiri Slabybadffb72007-08-28 17:01:54 -0400352 if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200353 /* scanning finished during invoking of handlers */
354 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
355 return TXRX_DROP;
356 }
357
358 return TXRX_CONTINUE;
359}
360
361static ieee80211_txrx_result
362ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
363{
364 struct ieee80211_hdr *hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +0200365 hdr = (struct ieee80211_hdr *) rx->skb->data;
366
367 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
368 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
369 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
370 rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
371 hdr->seq_ctrl)) {
Jiri Slabybadffb72007-08-28 17:01:54 -0400372 if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200373 rx->local->dot11FrameDuplicateCount++;
374 rx->sta->num_duplicates++;
375 }
376 return TXRX_DROP;
377 } else
378 rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
379 }
380
Johannes Berg571ecf62007-07-27 15:43:22 +0200381 if (unlikely(rx->skb->len < 16)) {
382 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
383 return TXRX_DROP;
384 }
385
Jiri Slabybadffb72007-08-28 17:01:54 -0400386 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
Johannes Berg571ecf62007-07-27 15:43:22 +0200387 rx->skb->pkt_type = PACKET_OTHERHOST;
388 else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
389 rx->skb->pkt_type = PACKET_HOST;
390 else if (is_multicast_ether_addr(hdr->addr1)) {
391 if (is_broadcast_ether_addr(hdr->addr1))
392 rx->skb->pkt_type = PACKET_BROADCAST;
393 else
394 rx->skb->pkt_type = PACKET_MULTICAST;
395 } else
396 rx->skb->pkt_type = PACKET_OTHERHOST;
397
398 /* Drop disallowed frame classes based on STA auth/assoc state;
399 * IEEE 802.11, Chap 5.5.
400 *
401 * 80211.o does filtering only based on association state, i.e., it
402 * drops Class 3 frames from not associated stations. hostapd sends
403 * deauth/disassoc frames when needed. In addition, hostapd is
404 * responsible for filtering on both auth and assoc states.
405 */
406 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
407 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
408 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
409 rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
410 (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
411 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
412 !(rx->fc & IEEE80211_FCTL_TODS) &&
413 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
Jiri Slabybadffb72007-08-28 17:01:54 -0400414 || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200415 /* Drop IBSS frames and frames for other hosts
416 * silently. */
417 return TXRX_DROP;
418 }
419
Johannes Bergf9d540e2007-09-28 14:02:09 +0200420 return TXRX_DROP;
Johannes Berg571ecf62007-07-27 15:43:22 +0200421 }
422
Johannes Berg570bd532007-07-27 15:43:22 +0200423 return TXRX_CONTINUE;
424}
425
426
427static ieee80211_txrx_result
Johannes Berg1990af82007-09-26 17:53:15 +0200428ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
Johannes Berg570bd532007-07-27 15:43:22 +0200429{
430 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
Johannes Berg3017b802007-08-28 17:01:53 -0400431 int keyidx;
432 int hdrlen;
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200433 ieee80211_txrx_result result = TXRX_DROP;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400434 struct ieee80211_key *stakey = NULL;
Johannes Berg570bd532007-07-27 15:43:22 +0200435
Johannes Berg3017b802007-08-28 17:01:53 -0400436 /*
437 * Key selection 101
438 *
439 * There are three types of keys:
440 * - GTK (group keys)
441 * - PTK (pairwise keys)
442 * - STK (station-to-station pairwise keys)
443 *
444 * When selecting a key, we have to distinguish between multicast
445 * (including broadcast) and unicast frames, the latter can only
446 * use PTKs and STKs while the former always use GTKs. Unless, of
447 * course, actual WEP keys ("pre-RSNA") are used, then unicast
448 * frames can also use key indizes like GTKs. Hence, if we don't
449 * have a PTK/STK we check the key index for a WEP key.
450 *
Johannes Berg8dc06a12007-08-28 17:01:55 -0400451 * Note that in a regular BSS, multicast frames are sent by the
452 * AP only, associated stations unicast the frame to the AP first
453 * which then multicasts it on their behalf.
454 *
Johannes Berg3017b802007-08-28 17:01:53 -0400455 * There is also a slight problem in IBSS mode: GTKs are negotiated
456 * with each station, that is something we don't currently handle.
Johannes Berg8dc06a12007-08-28 17:01:55 -0400457 * The spec seems to expect that one negotiates the same key with
458 * every station but there's no such requirement; VLANs could be
459 * possible.
Johannes Berg3017b802007-08-28 17:01:53 -0400460 */
Johannes Berg571ecf62007-07-27 15:43:22 +0200461
Johannes Berg3017b802007-08-28 17:01:53 -0400462 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
463 return TXRX_CONTINUE;
464
465 /*
Johannes Berg1990af82007-09-26 17:53:15 +0200466 * No point in finding a key and decrypting if the frame is neither
Johannes Berg3017b802007-08-28 17:01:53 -0400467 * addressed to us nor a multicast frame.
468 */
Jiri Slabybadffb72007-08-28 17:01:54 -0400469 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
Johannes Berg3017b802007-08-28 17:01:53 -0400470 return TXRX_CONTINUE;
471
Johannes Bergd4e46a32007-09-14 11:10:24 -0400472 if (rx->sta)
473 stakey = rcu_dereference(rx->sta->key);
474
475 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
476 rx->key = stakey;
Johannes Berg571ecf62007-07-27 15:43:22 +0200477 } else {
Johannes Berg3017b802007-08-28 17:01:53 -0400478 /*
479 * The device doesn't give us the IV so we won't be
480 * able to look up the key. That's ok though, we
481 * don't need to decrypt the frame, we just won't
482 * be able to keep statistics accurate.
483 * Except for key threshold notifications, should
484 * we somehow allow the driver to tell us which key
485 * the hardware used if this flag is set?
486 */
Johannes Berg7848ba72007-09-14 11:10:25 -0400487 if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
488 (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
Johannes Berg3017b802007-08-28 17:01:53 -0400489 return TXRX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200490
Johannes Berg3017b802007-08-28 17:01:53 -0400491 hdrlen = ieee80211_get_hdrlen(rx->fc);
Johannes Berg571ecf62007-07-27 15:43:22 +0200492
Johannes Berg3017b802007-08-28 17:01:53 -0400493 if (rx->skb->len < 8 + hdrlen)
494 return TXRX_DROP; /* TODO: count this? */
Johannes Berg571ecf62007-07-27 15:43:22 +0200495
Johannes Berg3017b802007-08-28 17:01:53 -0400496 /*
497 * no need to call ieee80211_wep_get_keyidx,
498 * it verifies a bunch of things we've done already
499 */
500 keyidx = rx->skb->data[hdrlen + 3] >> 6;
501
Johannes Bergd4e46a32007-09-14 11:10:24 -0400502 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
Johannes Berg3017b802007-08-28 17:01:53 -0400503
504 /*
505 * RSNA-protected unicast frames should always be sent with
506 * pairwise or station-to-station keys, but for WEP we allow
507 * using a key index as well.
508 */
Johannes Berg8f20fc22007-08-28 17:01:54 -0400509 if (rx->key && rx->key->conf.alg != ALG_WEP &&
Johannes Berg3017b802007-08-28 17:01:53 -0400510 !is_multicast_ether_addr(hdr->addr1))
511 rx->key = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +0200512 }
513
Johannes Berg3017b802007-08-28 17:01:53 -0400514 if (rx->key) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200515 rx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -0400516 /* TODO: add threshold stuff again */
Johannes Berg1990af82007-09-26 17:53:15 +0200517 } else {
John W. Linville7f3ad892007-11-06 17:12:31 -0500518#ifdef CONFIG_MAC80211_DEBUG
Johannes Berg70f08762007-09-26 17:53:14 +0200519 if (net_ratelimit())
520 printk(KERN_DEBUG "%s: RX protected frame,"
521 " but have no key\n", rx->dev->name);
John W. Linville7f3ad892007-11-06 17:12:31 -0500522#endif /* CONFIG_MAC80211_DEBUG */
Johannes Berg70f08762007-09-26 17:53:14 +0200523 return TXRX_DROP;
524 }
525
Johannes Berg1990af82007-09-26 17:53:15 +0200526 /* Check for weak IVs if possible */
527 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
528 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
529 (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) ||
530 !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) &&
531 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
532 rx->sta->wep_weak_iv_count++;
533
Johannes Berg70f08762007-09-26 17:53:14 +0200534 switch (rx->key->conf.alg) {
535 case ALG_WEP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200536 result = ieee80211_crypto_wep_decrypt(rx);
537 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200538 case ALG_TKIP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200539 result = ieee80211_crypto_tkip_decrypt(rx);
540 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200541 case ALG_CCMP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200542 result = ieee80211_crypto_ccmp_decrypt(rx);
543 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200544 }
545
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200546 /* either the frame has been decrypted or will be dropped */
547 rx->u.rx.status->flag |= RX_FLAG_DECRYPTED;
548
549 return result;
Johannes Berg70f08762007-09-26 17:53:14 +0200550}
551
Johannes Berg571ecf62007-07-27 15:43:22 +0200552static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
553{
554 struct ieee80211_sub_if_data *sdata;
Joe Perches0795af52007-10-03 17:59:30 -0700555 DECLARE_MAC_BUF(mac);
556
Johannes Berg571ecf62007-07-27 15:43:22 +0200557 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
558
559 if (sdata->bss)
560 atomic_inc(&sdata->bss->num_sta_ps);
561 sta->flags |= WLAN_STA_PS;
562 sta->pspoll = 0;
563#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700564 printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
565 dev->name, print_mac(mac, sta->addr), sta->aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200566#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
567}
568
569static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
570{
571 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
572 struct sk_buff *skb;
573 int sent = 0;
574 struct ieee80211_sub_if_data *sdata;
575 struct ieee80211_tx_packet_data *pkt_data;
Joe Perches0795af52007-10-03 17:59:30 -0700576 DECLARE_MAC_BUF(mac);
Johannes Berg571ecf62007-07-27 15:43:22 +0200577
578 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
579 if (sdata->bss)
580 atomic_dec(&sdata->bss->num_sta_ps);
581 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
582 sta->pspoll = 0;
583 if (!skb_queue_empty(&sta->ps_tx_buf)) {
584 if (local->ops->set_tim)
585 local->ops->set_tim(local_to_hw(local), sta->aid, 0);
586 if (sdata->bss)
587 bss_tim_clear(local, sdata->bss, sta->aid);
588 }
589#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700590 printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
591 dev->name, print_mac(mac, sta->addr), sta->aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200592#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
593 /* Send all buffered frames to the station */
594 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
595 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
596 sent++;
Jiri Slabye8bf9642007-08-28 17:01:54 -0400597 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200598 dev_queue_xmit(skb);
599 }
600 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
601 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
602 local->total_ps_buffered--;
603 sent++;
604#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700605 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
Johannes Berg571ecf62007-07-27 15:43:22 +0200606 "since STA not sleeping anymore\n", dev->name,
Joe Perches0795af52007-10-03 17:59:30 -0700607 print_mac(mac, sta->addr), sta->aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200608#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Jiri Slabye8bf9642007-08-28 17:01:54 -0400609 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200610 dev_queue_xmit(skb);
611 }
612
613 return sent;
614}
615
616static ieee80211_txrx_result
617ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
618{
619 struct sta_info *sta = rx->sta;
620 struct net_device *dev = rx->dev;
621 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
622
623 if (!sta)
624 return TXRX_CONTINUE;
625
626 /* Update last_rx only for IBSS packets which are for the current
627 * BSSID to avoid keeping the current IBSS network alive in cases where
628 * other STAs are using different BSSID. */
629 if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
630 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
631 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
632 sta->last_rx = jiffies;
633 } else
634 if (!is_multicast_ether_addr(hdr->addr1) ||
635 rx->sdata->type == IEEE80211_IF_TYPE_STA) {
636 /* Update last_rx only for unicast frames in order to prevent
637 * the Probe Request frames (the only broadcast frames from a
638 * STA in infrastructure mode) from keeping a connection alive.
639 */
640 sta->last_rx = jiffies;
641 }
642
Jiri Slabybadffb72007-08-28 17:01:54 -0400643 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
Johannes Berg571ecf62007-07-27 15:43:22 +0200644 return TXRX_CONTINUE;
645
646 sta->rx_fragments++;
647 sta->rx_bytes += rx->skb->len;
Larry Finger6c55aa92007-08-28 17:01:55 -0400648 sta->last_rssi = rx->u.rx.status->ssi;
649 sta->last_signal = rx->u.rx.status->signal;
650 sta->last_noise = rx->u.rx.status->noise;
Johannes Berg571ecf62007-07-27 15:43:22 +0200651
652 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
653 /* Change STA power saving mode only in the end of a frame
654 * exchange sequence */
655 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
656 rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
657 else if (!(sta->flags & WLAN_STA_PS) &&
658 (rx->fc & IEEE80211_FCTL_PM))
659 ap_sta_ps_start(dev, sta);
660 }
661
662 /* Drop data::nullfunc frames silently, since they are used only to
663 * control station power saving mode. */
664 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
665 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
666 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
667 /* Update counter and free packet here to avoid counting this
668 * as a dropped packed. */
669 sta->rx_packets++;
670 dev_kfree_skb(rx->skb);
671 return TXRX_QUEUED;
672 }
673
674 return TXRX_CONTINUE;
675} /* ieee80211_rx_h_sta_process */
676
Johannes Berg571ecf62007-07-27 15:43:22 +0200677static inline struct ieee80211_fragment_entry *
678ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
679 unsigned int frag, unsigned int seq, int rx_queue,
680 struct sk_buff **skb)
681{
682 struct ieee80211_fragment_entry *entry;
683 int idx;
684
685 idx = sdata->fragment_next;
686 entry = &sdata->fragments[sdata->fragment_next++];
687 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
688 sdata->fragment_next = 0;
689
690 if (!skb_queue_empty(&entry->skb_list)) {
691#ifdef CONFIG_MAC80211_DEBUG
692 struct ieee80211_hdr *hdr =
693 (struct ieee80211_hdr *) entry->skb_list.next->data;
Joe Perches0795af52007-10-03 17:59:30 -0700694 DECLARE_MAC_BUF(mac);
695 DECLARE_MAC_BUF(mac2);
Johannes Berg571ecf62007-07-27 15:43:22 +0200696 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
697 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
Joe Perches0795af52007-10-03 17:59:30 -0700698 "addr1=%s addr2=%s\n",
Johannes Berg571ecf62007-07-27 15:43:22 +0200699 sdata->dev->name, idx,
700 jiffies - entry->first_frag_time, entry->seq,
Joe Perches0795af52007-10-03 17:59:30 -0700701 entry->last_frag, print_mac(mac, hdr->addr1),
702 print_mac(mac2, hdr->addr2));
Johannes Berg571ecf62007-07-27 15:43:22 +0200703#endif /* CONFIG_MAC80211_DEBUG */
704 __skb_queue_purge(&entry->skb_list);
705 }
706
707 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
708 *skb = NULL;
709 entry->first_frag_time = jiffies;
710 entry->seq = seq;
711 entry->rx_queue = rx_queue;
712 entry->last_frag = frag;
713 entry->ccmp = 0;
714 entry->extra_len = 0;
715
716 return entry;
717}
718
719static inline struct ieee80211_fragment_entry *
720ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
721 u16 fc, unsigned int frag, unsigned int seq,
722 int rx_queue, struct ieee80211_hdr *hdr)
723{
724 struct ieee80211_fragment_entry *entry;
725 int i, idx;
726
727 idx = sdata->fragment_next;
728 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
729 struct ieee80211_hdr *f_hdr;
730 u16 f_fc;
731
732 idx--;
733 if (idx < 0)
734 idx = IEEE80211_FRAGMENT_MAX - 1;
735
736 entry = &sdata->fragments[idx];
737 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
738 entry->rx_queue != rx_queue ||
739 entry->last_frag + 1 != frag)
740 continue;
741
742 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
743 f_fc = le16_to_cpu(f_hdr->frame_control);
744
745 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
746 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
747 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
748 continue;
749
750 if (entry->first_frag_time + 2 * HZ < jiffies) {
751 __skb_queue_purge(&entry->skb_list);
752 continue;
753 }
754 return entry;
755 }
756
757 return NULL;
758}
759
760static ieee80211_txrx_result
761ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
762{
763 struct ieee80211_hdr *hdr;
764 u16 sc;
765 unsigned int frag, seq;
766 struct ieee80211_fragment_entry *entry;
767 struct sk_buff *skb;
Joe Perches0795af52007-10-03 17:59:30 -0700768 DECLARE_MAC_BUF(mac);
Johannes Berg571ecf62007-07-27 15:43:22 +0200769
770 hdr = (struct ieee80211_hdr *) rx->skb->data;
771 sc = le16_to_cpu(hdr->seq_ctrl);
772 frag = sc & IEEE80211_SCTL_FRAG;
773
774 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
775 (rx->skb)->len < 24 ||
776 is_multicast_ether_addr(hdr->addr1))) {
777 /* not fragmented */
778 goto out;
779 }
780 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
781
782 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
783
784 if (frag == 0) {
785 /* This is the first fragment of a new frame. */
786 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
787 rx->u.rx.queue, &(rx->skb));
Johannes Berg8f20fc22007-08-28 17:01:54 -0400788 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
Johannes Berg571ecf62007-07-27 15:43:22 +0200789 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
790 /* Store CCMP PN so that we can verify that the next
791 * fragment has a sequential PN value. */
792 entry->ccmp = 1;
793 memcpy(entry->last_pn,
794 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
795 CCMP_PN_LEN);
796 }
797 return TXRX_QUEUED;
798 }
799
800 /* This is a fragment for a frame that should already be pending in
801 * fragment cache. Add this fragment to the end of the pending entry.
802 */
803 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
804 rx->u.rx.queue, hdr);
805 if (!entry) {
806 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
807 return TXRX_DROP;
808 }
809
810 /* Verify that MPDUs within one MSDU have sequential PN values.
811 * (IEEE 802.11i, 8.3.3.4.5) */
812 if (entry->ccmp) {
813 int i;
814 u8 pn[CCMP_PN_LEN], *rpn;
Johannes Berg8f20fc22007-08-28 17:01:54 -0400815 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
Johannes Berg571ecf62007-07-27 15:43:22 +0200816 return TXRX_DROP;
817 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
818 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
819 pn[i]++;
820 if (pn[i])
821 break;
822 }
823 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
824 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
Johannes Berg1a84f3f2007-08-28 17:01:52 -0400825 if (net_ratelimit())
826 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
Joe Perches0795af52007-10-03 17:59:30 -0700827 "sequential A2=%s"
Johannes Berg1a84f3f2007-08-28 17:01:52 -0400828 " PN=%02x%02x%02x%02x%02x%02x "
829 "(expected %02x%02x%02x%02x%02x%02x)\n",
Joe Perches0795af52007-10-03 17:59:30 -0700830 rx->dev->name, print_mac(mac, hdr->addr2),
Johannes Berg1a84f3f2007-08-28 17:01:52 -0400831 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
832 rpn[5], pn[0], pn[1], pn[2], pn[3],
833 pn[4], pn[5]);
Johannes Berg571ecf62007-07-27 15:43:22 +0200834 return TXRX_DROP;
835 }
836 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
837 }
838
839 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
840 __skb_queue_tail(&entry->skb_list, rx->skb);
841 entry->last_frag = frag;
842 entry->extra_len += rx->skb->len;
843 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
844 rx->skb = NULL;
845 return TXRX_QUEUED;
846 }
847
848 rx->skb = __skb_dequeue(&entry->skb_list);
849 if (skb_tailroom(rx->skb) < entry->extra_len) {
850 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
851 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
852 GFP_ATOMIC))) {
853 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
854 __skb_queue_purge(&entry->skb_list);
855 return TXRX_DROP;
856 }
857 }
858 while ((skb = __skb_dequeue(&entry->skb_list))) {
859 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
860 dev_kfree_skb(skb);
861 }
862
863 /* Complete frame has been reassembled - process it now */
Jiri Slabybadffb72007-08-28 17:01:54 -0400864 rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200865
866 out:
867 if (rx->sta)
868 rx->sta->rx_packets++;
869 if (is_multicast_ether_addr(hdr->addr1))
870 rx->local->dot11MulticastReceivedFrameCount++;
871 else
872 ieee80211_led_rx(rx->local);
873 return TXRX_CONTINUE;
874}
875
876static ieee80211_txrx_result
877ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
878{
879 struct sk_buff *skb;
880 int no_pending_pkts;
Joe Perches0795af52007-10-03 17:59:30 -0700881 DECLARE_MAC_BUF(mac);
Johannes Berg571ecf62007-07-27 15:43:22 +0200882
883 if (likely(!rx->sta ||
884 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
885 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
Jiri Slabybadffb72007-08-28 17:01:54 -0400886 !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
Johannes Berg571ecf62007-07-27 15:43:22 +0200887 return TXRX_CONTINUE;
888
889 skb = skb_dequeue(&rx->sta->tx_filtered);
890 if (!skb) {
891 skb = skb_dequeue(&rx->sta->ps_tx_buf);
892 if (skb)
893 rx->local->total_ps_buffered--;
894 }
895 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
896 skb_queue_empty(&rx->sta->ps_tx_buf);
897
898 if (skb) {
899 struct ieee80211_hdr *hdr =
900 (struct ieee80211_hdr *) skb->data;
901
902 /* tell TX path to send one frame even though the STA may
903 * still remain is PS mode after this frame exchange */
904 rx->sta->pspoll = 1;
905
906#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700907 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
908 print_mac(mac, rx->sta->addr), rx->sta->aid,
Johannes Berg571ecf62007-07-27 15:43:22 +0200909 skb_queue_len(&rx->sta->ps_tx_buf));
910#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
911
912 /* Use MoreData flag to indicate whether there are more
913 * buffered frames for this STA */
914 if (no_pending_pkts) {
915 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
916 rx->sta->flags &= ~WLAN_STA_TIM;
917 } else
918 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
919
920 dev_queue_xmit(skb);
921
922 if (no_pending_pkts) {
923 if (rx->local->ops->set_tim)
924 rx->local->ops->set_tim(local_to_hw(rx->local),
925 rx->sta->aid, 0);
926 if (rx->sdata->bss)
927 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
928 }
929#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
930 } else if (!rx->u.rx.sent_ps_buffered) {
Joe Perches0795af52007-10-03 17:59:30 -0700931 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
Johannes Berg571ecf62007-07-27 15:43:22 +0200932 "though there is no buffered frames for it\n",
Joe Perches0795af52007-10-03 17:59:30 -0700933 rx->dev->name, print_mac(mac, rx->sta->addr));
Johannes Berg571ecf62007-07-27 15:43:22 +0200934#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
935
936 }
937
938 /* Free PS Poll skb here instead of returning TXRX_DROP that would
939 * count as an dropped frame. */
940 dev_kfree_skb(rx->skb);
941
942 return TXRX_QUEUED;
943}
944
945static ieee80211_txrx_result
Johannes Berg6e0d1142007-07-27 15:43:22 +0200946ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
947{
948 u16 fc = rx->fc;
949 u8 *data = rx->skb->data;
950 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
951
952 if (!WLAN_FC_IS_QOS_DATA(fc))
953 return TXRX_CONTINUE;
954
955 /* remove the qos control field, update frame type and meta-data */
956 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
957 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
958 /* change frame type to non QOS */
959 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
960 hdr->frame_control = cpu_to_le16(fc);
961
962 return TXRX_CONTINUE;
963}
964
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +0200965static int
966ieee80211_drop_802_1x_pae(struct ieee80211_txrx_data *rx, int hdrlen)
Johannes Berg571ecf62007-07-27 15:43:22 +0200967{
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +0200968 if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb, hdrlen) &&
Jiri Slabybadffb72007-08-28 17:01:54 -0400969 rx->sdata->type != IEEE80211_IF_TYPE_STA &&
Johannes Bergf9d540e2007-09-28 14:02:09 +0200970 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +0200971 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +0200972
973 if (unlikely(rx->sdata->ieee802_1x &&
974 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
975 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
976 (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +0200977 !ieee80211_is_eapol(rx->skb, hdrlen))) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200978#ifdef CONFIG_MAC80211_DEBUG
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +0200979 printk(KERN_DEBUG "%s: dropped frame "
980 "(unauthorized port)\n", rx->dev->name);
Johannes Berg571ecf62007-07-27 15:43:22 +0200981#endif /* CONFIG_MAC80211_DEBUG */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +0200982 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +0200983 }
984
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +0200985 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +0200986}
987
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +0200988static int
989ieee80211_drop_unencrypted(struct ieee80211_txrx_data *rx, int hdrlen)
Johannes Berg571ecf62007-07-27 15:43:22 +0200990{
Johannes Berg3017b802007-08-28 17:01:53 -0400991 /*
Johannes Berg7848ba72007-09-14 11:10:25 -0400992 * Pass through unencrypted frames if the hardware has
993 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -0400994 */
Johannes Berg7848ba72007-09-14 11:10:25 -0400995 if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +0200996 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +0200997
998 /* Drop unencrypted frames if key is set. */
999 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
1000 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
1001 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
Johannes Berg83125122007-11-28 11:07:57 +01001002 (rx->key || rx->sdata->drop_unencrypted) &&
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001003 (rx->sdata->eapol == 0 ||
1004 !ieee80211_is_eapol(rx->skb, hdrlen)))) {
Johannes Berg1a84f3f2007-08-28 17:01:52 -04001005 if (net_ratelimit())
1006 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
1007 "encryption\n", rx->dev->name);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001008 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001009 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001010 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001011}
1012
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001013static int
1014ieee80211_data_to_8023(struct ieee80211_txrx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001015{
1016 struct net_device *dev = rx->dev;
Johannes Berg571ecf62007-07-27 15:43:22 +02001017 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1018 u16 fc, hdrlen, ethertype;
1019 u8 *payload;
1020 u8 dst[ETH_ALEN];
1021 u8 src[ETH_ALEN];
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001022 struct sk_buff *skb = rx->skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001023 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Joe Perches0795af52007-10-03 17:59:30 -07001024 DECLARE_MAC_BUF(mac);
1025 DECLARE_MAC_BUF(mac2);
1026 DECLARE_MAC_BUF(mac3);
1027 DECLARE_MAC_BUF(mac4);
Johannes Berg571ecf62007-07-27 15:43:22 +02001028
1029 fc = rx->fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001030
1031 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001032 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001033
1034 hdrlen = ieee80211_get_hdrlen(fc);
1035
1036 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1037 * header
1038 * IEEE 802.11 address fields:
1039 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1040 * 0 0 DA SA BSSID n/a
1041 * 0 1 DA BSSID SA n/a
1042 * 1 0 BSSID SA DA n/a
1043 * 1 1 RA TA DA SA
1044 */
1045
1046 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1047 case IEEE80211_FCTL_TODS:
1048 /* BSSID SA DA */
1049 memcpy(dst, hdr->addr3, ETH_ALEN);
1050 memcpy(src, hdr->addr2, ETH_ALEN);
1051
1052 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
1053 sdata->type != IEEE80211_IF_TYPE_VLAN)) {
Johannes Berg1a84f3f2007-08-28 17:01:52 -04001054 if (net_ratelimit())
1055 printk(KERN_DEBUG "%s: dropped ToDS frame "
Joe Perches0795af52007-10-03 17:59:30 -07001056 "(BSSID=%s SA=%s DA=%s)\n",
Johannes Berg1a84f3f2007-08-28 17:01:52 -04001057 dev->name,
Joe Perches0795af52007-10-03 17:59:30 -07001058 print_mac(mac, hdr->addr1),
1059 print_mac(mac2, hdr->addr2),
1060 print_mac(mac3, hdr->addr3));
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001061 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001062 }
1063 break;
1064 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1065 /* RA TA DA SA */
1066 memcpy(dst, hdr->addr3, ETH_ALEN);
1067 memcpy(src, hdr->addr4, ETH_ALEN);
1068
1069 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
Johannes Berg1a84f3f2007-08-28 17:01:52 -04001070 if (net_ratelimit())
1071 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
Joe Perches0795af52007-10-03 17:59:30 -07001072 "frame (RA=%s TA=%s DA=%s SA=%s)\n",
Johannes Berg1a84f3f2007-08-28 17:01:52 -04001073 rx->dev->name,
Joe Perches0795af52007-10-03 17:59:30 -07001074 print_mac(mac, hdr->addr1),
1075 print_mac(mac2, hdr->addr2),
1076 print_mac(mac3, hdr->addr3),
1077 print_mac(mac4, hdr->addr4));
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001078 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001079 }
1080 break;
1081 case IEEE80211_FCTL_FROMDS:
1082 /* DA BSSID SA */
1083 memcpy(dst, hdr->addr1, ETH_ALEN);
1084 memcpy(src, hdr->addr3, ETH_ALEN);
1085
John W. Linvilleb3316152007-08-28 17:01:55 -04001086 if (sdata->type != IEEE80211_IF_TYPE_STA ||
1087 (is_multicast_ether_addr(dst) &&
1088 !compare_ether_addr(src, dev->dev_addr)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001089 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001090 break;
1091 case 0:
1092 /* DA SA BSSID */
1093 memcpy(dst, hdr->addr1, ETH_ALEN);
1094 memcpy(src, hdr->addr2, ETH_ALEN);
1095
1096 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
1097 if (net_ratelimit()) {
Joe Perches0795af52007-10-03 17:59:30 -07001098 printk(KERN_DEBUG "%s: dropped IBSS frame "
1099 "(DA=%s SA=%s BSSID=%s)\n",
1100 dev->name,
1101 print_mac(mac, hdr->addr1),
1102 print_mac(mac2, hdr->addr2),
1103 print_mac(mac3, hdr->addr3));
Johannes Berg571ecf62007-07-27 15:43:22 +02001104 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001105 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001106 }
1107 break;
1108 }
1109
Johannes Berg571ecf62007-07-27 15:43:22 +02001110 if (unlikely(skb->len - hdrlen < 8)) {
1111 if (net_ratelimit()) {
1112 printk(KERN_DEBUG "%s: RX too short data frame "
1113 "payload\n", dev->name);
1114 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001115 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001116 }
1117
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001118 payload = skb->data + hdrlen;
Johannes Berg571ecf62007-07-27 15:43:22 +02001119 ethertype = (payload[6] << 8) | payload[7];
1120
1121 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1122 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1123 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1124 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1125 * replace EtherType */
1126 skb_pull(skb, hdrlen + 6);
1127 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1128 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1129 } else {
1130 struct ethhdr *ehdr;
1131 __be16 len;
1132 skb_pull(skb, hdrlen);
1133 len = htons(skb->len);
1134 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1135 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1136 memcpy(ehdr->h_source, src, ETH_ALEN);
1137 ehdr->h_proto = len;
1138 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001139 return 0;
1140}
Johannes Berg571ecf62007-07-27 15:43:22 +02001141
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001142static void
1143ieee80211_deliver_skb(struct ieee80211_txrx_data *rx)
1144{
1145 struct net_device *dev = rx->dev;
1146 struct ieee80211_local *local = rx->local;
1147 struct sk_buff *skb, *xmit_skb;
1148 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Johannes Berg571ecf62007-07-27 15:43:22 +02001149
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001150 skb = rx->skb;
1151 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001152
1153 if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
Jiri Slabybadffb72007-08-28 17:01:54 -04001154 || sdata->type == IEEE80211_IF_TYPE_VLAN) &&
1155 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001156 if (is_multicast_ether_addr(skb->data)) {
1157 /* send multicast frames both to higher layers in
1158 * local net stack and back to the wireless media */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001159 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1160 if (!xmit_skb && net_ratelimit())
Johannes Berg571ecf62007-07-27 15:43:22 +02001161 printk(KERN_DEBUG "%s: failed to clone "
1162 "multicast frame\n", dev->name);
1163 } else {
1164 struct sta_info *dsta;
1165 dsta = sta_info_get(local, skb->data);
1166 if (dsta && !dsta->dev) {
Johannes Berg1a84f3f2007-08-28 17:01:52 -04001167 if (net_ratelimit())
1168 printk(KERN_DEBUG "Station with null "
1169 "dev structure!\n");
Johannes Berg571ecf62007-07-27 15:43:22 +02001170 } else if (dsta && dsta->dev == dev) {
1171 /* Destination station is associated to this
1172 * AP, so send the frame directly to it and
1173 * do not pass the frame to local net stack.
1174 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001175 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001176 skb = NULL;
1177 }
1178 if (dsta)
1179 sta_info_put(dsta);
1180 }
1181 }
1182
1183 if (skb) {
1184 /* deliver to local stack */
1185 skb->protocol = eth_type_trans(skb, dev);
1186 memset(skb->cb, 0, sizeof(skb->cb));
1187 netif_rx(skb);
1188 }
1189
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001190 if (xmit_skb) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001191 /* send to wireless media */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001192 xmit_skb->protocol = __constant_htons(ETH_P_802_3);
1193 skb_set_network_header(xmit_skb, 0);
1194 skb_set_mac_header(xmit_skb, 0);
1195 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001196 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001197}
1198
1199static ieee80211_txrx_result
1200ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
1201{
1202 struct net_device *dev = rx->dev;
1203 u16 fc;
1204 int err, hdrlen;
1205
1206 fc = rx->fc;
1207 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1208 return TXRX_CONTINUE;
1209
1210 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1211 return TXRX_DROP;
1212
1213 hdrlen = ieee80211_get_hdrlen(fc);
1214
1215 if ((ieee80211_drop_802_1x_pae(rx, hdrlen)) ||
1216 (ieee80211_drop_unencrypted(rx, hdrlen)))
1217 return TXRX_DROP;
1218
1219 err = ieee80211_data_to_8023(rx);
1220 if (unlikely(err))
1221 return TXRX_DROP;
1222
1223 rx->skb->dev = dev;
1224
1225 dev->stats.rx_packets++;
1226 dev->stats.rx_bytes += rx->skb->len;
1227
1228 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02001229
1230 return TXRX_QUEUED;
1231}
1232
1233static ieee80211_txrx_result
1234ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1235{
1236 struct ieee80211_sub_if_data *sdata;
1237
Jiri Slabybadffb72007-08-28 17:01:54 -04001238 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
Johannes Berg571ecf62007-07-27 15:43:22 +02001239 return TXRX_DROP;
1240
1241 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1242 if ((sdata->type == IEEE80211_IF_TYPE_STA ||
1243 sdata->type == IEEE80211_IF_TYPE_IBSS) &&
Johannes Bergddd3d2b2007-09-26 17:53:20 +02001244 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
Johannes Berg571ecf62007-07-27 15:43:22 +02001245 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
Johannes Bergf9d540e2007-09-28 14:02:09 +02001246 else
1247 return TXRX_DROP;
1248
Johannes Berg571ecf62007-07-27 15:43:22 +02001249 return TXRX_QUEUED;
1250}
1251
1252static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1253 struct ieee80211_local *local,
1254 ieee80211_rx_handler *handlers,
1255 struct ieee80211_txrx_data *rx,
1256 struct sta_info *sta)
1257{
1258 ieee80211_rx_handler *handler;
1259 ieee80211_txrx_result res = TXRX_DROP;
1260
1261 for (handler = handlers; *handler != NULL; handler++) {
1262 res = (*handler)(rx);
Johannes Berg8e6f0032007-07-27 15:43:22 +02001263
1264 switch (res) {
1265 case TXRX_CONTINUE:
1266 continue;
1267 case TXRX_DROP:
1268 I802_DEBUG_INC(local->rx_handlers_drop);
1269 if (sta)
1270 sta->rx_dropped++;
1271 break;
1272 case TXRX_QUEUED:
1273 I802_DEBUG_INC(local->rx_handlers_queued);
Johannes Berg571ecf62007-07-27 15:43:22 +02001274 break;
1275 }
Johannes Berg8e6f0032007-07-27 15:43:22 +02001276 break;
Johannes Berg571ecf62007-07-27 15:43:22 +02001277 }
1278
Johannes Berg8e6f0032007-07-27 15:43:22 +02001279 if (res == TXRX_DROP)
Johannes Berg571ecf62007-07-27 15:43:22 +02001280 dev_kfree_skb(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001281 return res;
1282}
1283
1284static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1285 ieee80211_rx_handler *handlers,
1286 struct ieee80211_txrx_data *rx,
1287 struct sta_info *sta)
1288{
1289 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1290 TXRX_CONTINUE)
1291 dev_kfree_skb(rx->skb);
1292}
1293
1294static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1295 struct ieee80211_hdr *hdr,
1296 struct sta_info *sta,
1297 struct ieee80211_txrx_data *rx)
1298{
1299 int keyidx, hdrlen;
Joe Perches0795af52007-10-03 17:59:30 -07001300 DECLARE_MAC_BUF(mac);
1301 DECLARE_MAC_BUF(mac2);
Johannes Berg571ecf62007-07-27 15:43:22 +02001302
1303 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1304 if (rx->skb->len >= hdrlen + 4)
1305 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1306 else
1307 keyidx = -1;
1308
Johannes Berg1a84f3f2007-08-28 17:01:52 -04001309 if (net_ratelimit())
1310 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
Joe Perches0795af52007-10-03 17:59:30 -07001311 "failure from %s to %s keyidx=%d\n",
1312 dev->name, print_mac(mac, hdr->addr2),
1313 print_mac(mac2, hdr->addr1), keyidx);
Johannes Berg571ecf62007-07-27 15:43:22 +02001314
1315 if (!sta) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001316 /*
1317 * Some hardware seem to generate incorrect Michael MIC
1318 * reports; ignore them to avoid triggering countermeasures.
1319 */
Johannes Berg1a84f3f2007-08-28 17:01:52 -04001320 if (net_ratelimit())
1321 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
Joe Perches0795af52007-10-03 17:59:30 -07001322 "error for unknown address %s\n",
1323 dev->name, print_mac(mac, hdr->addr2));
Johannes Berg571ecf62007-07-27 15:43:22 +02001324 goto ignore;
1325 }
1326
1327 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
Johannes Berg1a84f3f2007-08-28 17:01:52 -04001328 if (net_ratelimit())
1329 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
Johannes Bergaa0daf02007-09-10 14:15:25 +02001330 "error for a frame with no PROTECTED flag (src "
Joe Perches0795af52007-10-03 17:59:30 -07001331 "%s)\n", dev->name, print_mac(mac, hdr->addr2));
Johannes Berg571ecf62007-07-27 15:43:22 +02001332 goto ignore;
1333 }
1334
Johannes Berg7848ba72007-09-14 11:10:25 -04001335 if (rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001336 /*
1337 * APs with pairwise keys should never receive Michael MIC
1338 * errors for non-zero keyidx because these are reserved for
1339 * group keys and only the AP is sending real multicast
1340 * frames in the BSS.
1341 */
Johannes Bergeb063c12007-08-28 17:01:53 -04001342 if (net_ratelimit())
1343 printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1344 "a frame with non-zero keyidx (%d)"
Joe Perches0795af52007-10-03 17:59:30 -07001345 " (src %s)\n", dev->name, keyidx,
1346 print_mac(mac, hdr->addr2));
Johannes Bergeb063c12007-08-28 17:01:53 -04001347 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001348 }
1349
1350 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1351 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1352 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
Johannes Berg1a84f3f2007-08-28 17:01:52 -04001353 if (net_ratelimit())
1354 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1355 "error for a frame that cannot be encrypted "
Joe Perches0795af52007-10-03 17:59:30 -07001356 "(fc=0x%04x) (src %s)\n",
1357 dev->name, rx->fc, print_mac(mac, hdr->addr2));
Johannes Berg571ecf62007-07-27 15:43:22 +02001358 goto ignore;
1359 }
1360
Johannes Bergeb063c12007-08-28 17:01:53 -04001361 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001362 ignore:
1363 dev_kfree_skb(rx->skb);
1364 rx->skb = NULL;
1365}
1366
1367ieee80211_rx_handler ieee80211_rx_handlers[] =
1368{
1369 ieee80211_rx_h_if_stats,
Johannes Berg571ecf62007-07-27 15:43:22 +02001370 ieee80211_rx_h_passive_scan,
1371 ieee80211_rx_h_check,
Johannes Berg4f0d18e2007-09-26 15:19:40 +02001372 ieee80211_rx_h_decrypt,
Johannes Berg70f08762007-09-26 17:53:14 +02001373 ieee80211_rx_h_sta_process,
Johannes Berg571ecf62007-07-27 15:43:22 +02001374 ieee80211_rx_h_defragment,
1375 ieee80211_rx_h_ps_poll,
1376 ieee80211_rx_h_michael_mic_verify,
1377 /* this must be after decryption - so header is counted in MPDU mic
1378 * must be before pae and data, so QOS_DATA format frames
1379 * are not passed to user space by these functions
1380 */
1381 ieee80211_rx_h_remove_qos_control,
Johannes Berg571ecf62007-07-27 15:43:22 +02001382 ieee80211_rx_h_data,
1383 ieee80211_rx_h_mgmt,
1384 NULL
1385};
1386
1387/* main receive path */
1388
Johannes Berg23a24de2007-07-27 15:43:22 +02001389static 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)) {
Jiri Slabybadffb72007-08-28 17:01:54 -04001400 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02001401 return 0;
Jiri Slabybadffb72007-08-28 17:01:54 -04001402 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001403 } else if (!multicast &&
1404 compare_ether_addr(sdata->dev->dev_addr,
1405 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04001406 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02001407 return 0;
Jiri Slabybadffb72007-08-28 17:01:54 -04001408 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001409 }
1410 break;
1411 case IEEE80211_IF_TYPE_IBSS:
1412 if (!bssid)
1413 return 0;
1414 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
Jiri Slabybadffb72007-08-28 17:01:54 -04001415 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02001416 return 0;
Jiri Slabybadffb72007-08-28 17:01:54 -04001417 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001418 } else if (!multicast &&
1419 compare_ether_addr(sdata->dev->dev_addr,
1420 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04001421 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02001422 return 0;
Jiri Slabybadffb72007-08-28 17:01:54 -04001423 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001424 } else if (!rx->sta)
1425 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1426 bssid, hdr->addr2);
1427 break;
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02001428 case IEEE80211_IF_TYPE_VLAN:
Johannes Berg23a24de2007-07-27 15:43:22 +02001429 case IEEE80211_IF_TYPE_AP:
1430 if (!bssid) {
1431 if (compare_ether_addr(sdata->dev->dev_addr,
1432 hdr->addr1))
1433 return 0;
1434 } else if (!ieee80211_bssid_match(bssid,
1435 sdata->dev->dev_addr)) {
Jiri Slabybadffb72007-08-28 17:01:54 -04001436 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02001437 return 0;
Jiri Slabybadffb72007-08-28 17:01:54 -04001438 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001439 }
Jiri Slabybadffb72007-08-28 17:01:54 -04001440 if (sdata->dev == sdata->local->mdev &&
1441 !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02001442 /* do not receive anything via
1443 * master device when not scanning */
1444 return 0;
1445 break;
1446 case IEEE80211_IF_TYPE_WDS:
1447 if (bssid ||
1448 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1449 return 0;
1450 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1451 return 0;
1452 break;
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02001453 case IEEE80211_IF_TYPE_MNTR:
1454 /* take everything */
1455 break;
Johannes Berga2897552007-09-28 14:01:25 +02001456 case IEEE80211_IF_TYPE_INVALID:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02001457 /* should never get here */
1458 WARN_ON(1);
1459 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02001460 }
1461
1462 return 1;
1463}
1464
Johannes Berg571ecf62007-07-27 15:43:22 +02001465/*
1466 * This is the receive path handler. It is called by a low level driver when an
1467 * 802.11 MPDU is received from the hardware.
1468 */
1469void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1470 struct ieee80211_rx_status *status)
1471{
1472 struct ieee80211_local *local = hw_to_local(hw);
1473 struct ieee80211_sub_if_data *sdata;
1474 struct sta_info *sta;
1475 struct ieee80211_hdr *hdr;
1476 struct ieee80211_txrx_data rx;
1477 u16 type;
Johannes Bergb2e77712007-09-26 15:19:39 +02001478 int prepres;
Johannes Berg8e6f0032007-07-27 15:43:22 +02001479 struct ieee80211_sub_if_data *prev = NULL;
1480 struct sk_buff *skb_new;
1481 u8 *bssid;
David S. Millerd10f2152008-01-24 16:57:39 -08001482 int hdrlen;
Johannes Berg571ecf62007-07-27 15:43:22 +02001483
Johannes Bergd4e46a32007-09-14 11:10:24 -04001484 /*
Johannes Berg79010422007-09-18 17:29:21 -04001485 * key references and virtual interfaces are protected using RCU
1486 * and this requires that we are in a read-side RCU section during
1487 * receive processing
Johannes Bergd4e46a32007-09-14 11:10:24 -04001488 */
1489 rcu_read_lock();
1490
Johannes Bergb2e77712007-09-26 15:19:39 +02001491 /*
1492 * Frames with failed FCS/PLCP checksum are not returned,
1493 * all other frames are returned without radiotap header
1494 * if it was previously present.
1495 * Also, frames with less than 16 bytes are dropped.
1496 */
1497 skb = ieee80211_rx_monitor(local, skb, status);
1498 if (!skb) {
1499 rcu_read_unlock();
1500 return;
1501 }
1502
Johannes Berg571ecf62007-07-27 15:43:22 +02001503 hdr = (struct ieee80211_hdr *) skb->data;
1504 memset(&rx, 0, sizeof(rx));
1505 rx.skb = skb;
1506 rx.local = local;
1507
1508 rx.u.rx.status = status;
Johannes Bergb2e77712007-09-26 15:19:39 +02001509 rx.fc = le16_to_cpu(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +02001510 type = rx.fc & IEEE80211_FCTL_FTYPE;
Johannes Berg72abd812007-09-17 01:29:22 -04001511
David S. Millerd10f2152008-01-24 16:57:39 -08001512 /*
1513 * Drivers are required to align the payload data to a four-byte
1514 * boundary, so the last two bits of the address where it starts
1515 * may not be set. The header is required to be directly before
1516 * the payload data, padding like atheros hardware adds which is
1517 * inbetween the 802.11 header and the payload is not supported,
1518 * the driver is required to move the 802.11 header further back
1519 * in that case.
1520 */
1521 hdrlen = ieee80211_get_hdrlen(rx.fc);
1522 WARN_ON_ONCE(((unsigned long)(skb->data + hdrlen)) & 3);
1523
Johannes Bergb2e77712007-09-26 15:19:39 +02001524 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
Johannes Berg571ecf62007-07-27 15:43:22 +02001525 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02001526
Johannes Bergb2e77712007-09-26 15:19:39 +02001527 sta = rx.sta = sta_info_get(local, hdr->addr2);
1528 if (sta) {
1529 rx.dev = rx.sta->dev;
1530 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1531 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001532
Johannes Berg571ecf62007-07-27 15:43:22 +02001533 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1534 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1535 goto end;
1536 }
1537
Zhu Yiece8edd2007-11-22 10:53:21 +08001538 if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
Jiri Slabybadffb72007-08-28 17:01:54 -04001539 rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
Johannes Berg571ecf62007-07-27 15:43:22 +02001540
1541 if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1542 sta) != TXRX_CONTINUE)
1543 goto end;
1544 skb = rx.skb;
1545
Johannes Bergc9ee23d2007-08-28 17:01:55 -04001546 if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) &&
Johannes Berg53918992007-09-26 15:19:47 +02001547 !atomic_read(&local->iff_promiscs) &&
1548 !is_multicast_ether_addr(hdr->addr1)) {
Jiri Slabybadffb72007-08-28 17:01:54 -04001549 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
Johannes Berg571ecf62007-07-27 15:43:22 +02001550 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
Johannes Berg23a24de2007-07-27 15:43:22 +02001551 rx.sta);
Johannes Berg8e6f0032007-07-27 15:43:22 +02001552 sta_info_put(sta);
Johannes Bergd4e46a32007-09-14 11:10:24 -04001553 rcu_read_unlock();
Johannes Berg8e6f0032007-07-27 15:43:22 +02001554 return;
1555 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001556
Johannes Bergb2e77712007-09-26 15:19:39 +02001557 bssid = ieee80211_get_bssid(hdr, skb->len);
Johannes Berg571ecf62007-07-27 15:43:22 +02001558
Johannes Berg79010422007-09-18 17:29:21 -04001559 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg2a8a9a82007-08-28 17:01:52 -04001560 if (!netif_running(sdata->dev))
1561 continue;
1562
Johannes Bergb2e77712007-09-26 15:19:39 +02001563 if (sdata->type == IEEE80211_IF_TYPE_MNTR)
1564 continue;
1565
1566 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001567 prepres = prepare_for_handlers(sdata, bssid, &rx, hdr);
1568 /* prepare_for_handlers can change sta */
1569 sta = rx.sta;
1570
1571 if (!prepres)
1572 continue;
Johannes Berg8e6f0032007-07-27 15:43:22 +02001573
Johannes Berg340e11f2007-07-27 15:43:22 +02001574 /*
1575 * frame is destined for this interface, but if it's not
1576 * also for the previous one we handle that after the
1577 * loop to avoid copying the SKB once too much
1578 */
1579
1580 if (!prev) {
1581 prev = sdata;
1582 continue;
Johannes Berg8e6f0032007-07-27 15:43:22 +02001583 }
Johannes Berg340e11f2007-07-27 15:43:22 +02001584
1585 /*
1586 * frame was destined for the previous interface
1587 * so invoke RX handlers for it
1588 */
1589
1590 skb_new = skb_copy(skb, GFP_ATOMIC);
1591 if (!skb_new) {
1592 if (net_ratelimit())
1593 printk(KERN_DEBUG "%s: failed to copy "
1594 "multicast frame for %s",
Johannes Bergdd1cd4c2007-09-18 17:29:20 -04001595 wiphy_name(local->hw.wiphy),
1596 prev->dev->name);
Johannes Berg340e11f2007-07-27 15:43:22 +02001597 continue;
1598 }
1599 rx.skb = skb_new;
1600 rx.dev = prev->dev;
1601 rx.sdata = prev;
1602 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1603 &rx, sta);
Johannes Berg8e6f0032007-07-27 15:43:22 +02001604 prev = sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02001605 }
Johannes Berg8e6f0032007-07-27 15:43:22 +02001606 if (prev) {
1607 rx.skb = skb;
1608 rx.dev = prev->dev;
1609 rx.sdata = prev;
1610 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1611 &rx, sta);
1612 } else
1613 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001614
Johannes Berg8e6f0032007-07-27 15:43:22 +02001615 end:
Johannes Bergd4e46a32007-09-14 11:10:24 -04001616 rcu_read_unlock();
1617
Johannes Berg571ecf62007-07-27 15:43:22 +02001618 if (sta)
1619 sta_info_put(sta);
1620}
1621EXPORT_SYMBOL(__ieee80211_rx);
1622
1623/* This is a version of the rx handler that can be called from hard irq
1624 * context. Post the skb on the queue and schedule the tasklet */
1625void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1626 struct ieee80211_rx_status *status)
1627{
1628 struct ieee80211_local *local = hw_to_local(hw);
1629
1630 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1631
1632 skb->dev = local->mdev;
1633 /* copy status into skb->cb for use by tasklet */
1634 memcpy(skb->cb, status, sizeof(*status));
1635 skb->pkt_type = IEEE80211_RX_MSG;
1636 skb_queue_tail(&local->skb_queue, skb);
1637 tasklet_schedule(&local->tasklet);
1638}
1639EXPORT_SYMBOL(ieee80211_rx_irqsafe);