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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
S.Çağlar Onurab466232008-02-14 17:36:47 +020012#include <linux/jiffies.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020013#include <linux/kernel.h>
14#include <linux/skbuff.h>
15#include <linux/netdevice.h>
16#include <linux/etherdevice.h>
Johannes Bergd4e46a32007-09-14 11:10:24 -040017#include <linux/rcupdate.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020018#include <net/mac80211.h>
19#include <net/ieee80211_radiotap.h>
20
21#include "ieee80211_i.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040022#include "led.h"
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +010023#include "mesh.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020024#include "wep.h"
25#include "wpa.h"
26#include "tkip.h"
27#include "wme.h"
28
Ron Rindjunsky71364712007-12-25 17:00:36 +020029u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
30 struct tid_ampdu_rx *tid_agg_rx,
31 struct sk_buff *skb, u16 mpdu_seq_num,
32 int bar_req);
Johannes Bergb2e77712007-09-26 15:19:39 +020033/*
34 * monitor mode reception
35 *
36 * This function cleans up the SKB, i.e. it removes all the stuff
37 * only useful for monitoring.
38 */
39static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
40 struct sk_buff *skb,
41 int rtap_len)
42{
43 skb_pull(skb, rtap_len);
44
45 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
46 if (likely(skb->len > FCS_LEN))
47 skb_trim(skb, skb->len - FCS_LEN);
48 else {
49 /* driver bug */
50 WARN_ON(1);
51 dev_kfree_skb(skb);
52 skb = NULL;
53 }
54 }
55
56 return skb;
57}
58
59static inline int should_drop_frame(struct ieee80211_rx_status *status,
60 struct sk_buff *skb,
61 int present_fcs_len,
62 int radiotap_len)
63{
Harvey Harrison182503a2008-06-22 16:45:29 -070064 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Bergb2e77712007-09-26 15:19:39 +020065
66 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
67 return 1;
68 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
69 return 1;
Harvey Harrison87228f52008-06-11 14:21:59 -070070 if (ieee80211_is_ctl(hdr->frame_control) &&
71 !ieee80211_is_pspoll(hdr->frame_control) &&
72 !ieee80211_is_back_req(hdr->frame_control))
Johannes Bergb2e77712007-09-26 15:19:39 +020073 return 1;
74 return 0;
75}
76
Bruno Randolf601ae7f2008-05-08 19:22:43 +020077static int
78ieee80211_rx_radiotap_len(struct ieee80211_local *local,
79 struct ieee80211_rx_status *status)
80{
81 int len;
82
83 /* always present fields */
84 len = sizeof(struct ieee80211_radiotap_header) + 9;
85
86 if (status->flag & RX_FLAG_TSFT)
87 len += 8;
88 if (local->hw.flags & IEEE80211_HW_SIGNAL_DB ||
89 local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
90 len += 1;
91 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
92 len += 1;
93
94 if (len & 1) /* padding for RX_FLAGS if necessary */
95 len++;
96
97 /* make sure radiotap starts at a naturally aligned address */
98 if (len % 8)
99 len = roundup(len, 8);
100
101 return len;
102}
103
104/**
105 * ieee80211_add_rx_radiotap_header - add radiotap header
106 *
107 * add a radiotap header containing all the fields which the hardware provided.
108 */
109static void
110ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
111 struct sk_buff *skb,
112 struct ieee80211_rx_status *status,
113 struct ieee80211_rate *rate,
114 int rtap_len)
115{
116 struct ieee80211_radiotap_header *rthdr;
117 unsigned char *pos;
118
119 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
120 memset(rthdr, 0, rtap_len);
121
122 /* radiotap header, set always present flags */
123 rthdr->it_present =
124 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
125 (1 << IEEE80211_RADIOTAP_RATE) |
126 (1 << IEEE80211_RADIOTAP_CHANNEL) |
127 (1 << IEEE80211_RADIOTAP_ANTENNA) |
128 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
129 rthdr->it_len = cpu_to_le16(rtap_len);
130
131 pos = (unsigned char *)(rthdr+1);
132
133 /* the order of the following fields is important */
134
135 /* IEEE80211_RADIOTAP_TSFT */
136 if (status->flag & RX_FLAG_TSFT) {
137 *(__le64 *)pos = cpu_to_le64(status->mactime);
138 rthdr->it_present |=
139 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
140 pos += 8;
141 }
142
143 /* IEEE80211_RADIOTAP_FLAGS */
144 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
145 *pos |= IEEE80211_RADIOTAP_F_FCS;
Bruno Randolfb4f28bb2008-07-30 17:19:55 +0200146 if (status->flag & RX_FLAG_SHORTPRE)
147 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200148 pos++;
149
150 /* IEEE80211_RADIOTAP_RATE */
151 *pos = rate->bitrate / 5;
152 pos++;
153
154 /* IEEE80211_RADIOTAP_CHANNEL */
155 *(__le16 *)pos = cpu_to_le16(status->freq);
156 pos += 2;
157 if (status->band == IEEE80211_BAND_5GHZ)
158 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
159 IEEE80211_CHAN_5GHZ);
Bruno Randolf9deb1ae2008-07-30 17:20:06 +0200160 else if (rate->flags & IEEE80211_RATE_ERP_G)
161 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
162 IEEE80211_CHAN_2GHZ);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200163 else
Bruno Randolf9deb1ae2008-07-30 17:20:06 +0200164 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK |
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200165 IEEE80211_CHAN_2GHZ);
166 pos += 2;
167
168 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
169 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
170 *pos = status->signal;
171 rthdr->it_present |=
172 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
173 pos++;
174 }
175
176 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
177 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
178 *pos = status->noise;
179 rthdr->it_present |=
180 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
181 pos++;
182 }
183
184 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
185
186 /* IEEE80211_RADIOTAP_ANTENNA */
187 *pos = status->antenna;
188 pos++;
189
190 /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */
191 if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) {
192 *pos = status->signal;
193 rthdr->it_present |=
194 cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL);
195 pos++;
196 }
197
198 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
199
200 /* IEEE80211_RADIOTAP_RX_FLAGS */
201 /* ensure 2 byte alignment for the 2 byte field as required */
202 if ((pos - (unsigned char *)rthdr) & 1)
203 pos++;
204 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
205 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
206 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
207 pos += 2;
208}
209
Johannes Bergb2e77712007-09-26 15:19:39 +0200210/*
211 * This function copies a received frame to all monitor interfaces and
212 * returns a cleaned-up SKB that no longer includes the FCS nor the
213 * radiotap header the driver might have added.
214 */
215static struct sk_buff *
216ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
Johannes Berg8318d782008-01-24 19:38:38 +0100217 struct ieee80211_rx_status *status,
218 struct ieee80211_rate *rate)
Johannes Bergb2e77712007-09-26 15:19:39 +0200219{
220 struct ieee80211_sub_if_data *sdata;
Johannes Bergb2e77712007-09-26 15:19:39 +0200221 int needed_headroom = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200222 struct sk_buff *skb, *skb2;
223 struct net_device *prev_dev = NULL;
224 int present_fcs_len = 0;
225 int rtap_len = 0;
226
227 /*
228 * First, we may need to make a copy of the skb because
229 * (1) we need to modify it for radiotap (if not present), and
230 * (2) the other RX handlers will modify the skb we got.
231 *
232 * We don't need to, of course, if we aren't going to return
233 * the SKB because it has a bad FCS/PLCP checksum.
234 */
235 if (status->flag & RX_FLAG_RADIOTAP)
236 rtap_len = ieee80211_get_radiotap_len(origskb->data);
237 else
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200238 /* room for the radiotap header based on driver features */
239 needed_headroom = ieee80211_rx_radiotap_len(local, status);
Johannes Bergb2e77712007-09-26 15:19:39 +0200240
241 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
242 present_fcs_len = FCS_LEN;
243
244 if (!local->monitors) {
245 if (should_drop_frame(status, origskb, present_fcs_len,
246 rtap_len)) {
247 dev_kfree_skb(origskb);
248 return NULL;
249 }
250
251 return remove_monitor_info(local, origskb, rtap_len);
252 }
253
254 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
255 /* only need to expand headroom if necessary */
256 skb = origskb;
257 origskb = NULL;
258
259 /*
260 * This shouldn't trigger often because most devices have an
261 * RX header they pull before we get here, and that should
262 * be big enough for our radiotap information. We should
263 * probably export the length to drivers so that we can have
264 * them allocate enough headroom to start with.
265 */
266 if (skb_headroom(skb) < needed_headroom &&
Johannes Bergc49e5ea2007-12-11 21:33:42 +0100267 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200268 dev_kfree_skb(skb);
269 return NULL;
270 }
271 } else {
272 /*
273 * Need to make a copy and possibly remove radiotap header
274 * and FCS from the original.
275 */
276 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
277
278 origskb = remove_monitor_info(local, origskb, rtap_len);
279
280 if (!skb)
281 return origskb;
282 }
283
284 /* if necessary, prepend radiotap information */
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200285 if (!(status->flag & RX_FLAG_RADIOTAP))
286 ieee80211_add_rx_radiotap_header(local, skb, status, rate,
287 needed_headroom);
Johannes Bergb2e77712007-09-26 15:19:39 +0200288
Johannes Bergce3edf6d02007-12-19 01:31:22 +0100289 skb_reset_mac_header(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200290 skb->ip_summed = CHECKSUM_UNNECESSARY;
291 skb->pkt_type = PACKET_OTHERHOST;
292 skb->protocol = htons(ETH_P_802_2);
293
294 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
295 if (!netif_running(sdata->dev))
296 continue;
297
Johannes Berg51fb61e2007-12-19 01:31:27 +0100298 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR)
Johannes Bergb2e77712007-09-26 15:19:39 +0200299 continue;
300
Michael Wu3d30d942008-01-31 19:48:27 +0100301 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
302 continue;
303
Johannes Bergb2e77712007-09-26 15:19:39 +0200304 if (prev_dev) {
305 skb2 = skb_clone(skb, GFP_ATOMIC);
306 if (skb2) {
307 skb2->dev = prev_dev;
308 netif_rx(skb2);
309 }
310 }
311
312 prev_dev = sdata->dev;
313 sdata->dev->stats.rx_packets++;
314 sdata->dev->stats.rx_bytes += skb->len;
315 }
316
317 if (prev_dev) {
318 skb->dev = prev_dev;
319 netif_rx(skb);
320 } else
321 dev_kfree_skb(skb);
322
323 return origskb;
324}
325
326
Johannes Berg5cf121c2008-02-25 16:27:43 +0100327static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200328{
Harvey Harrison238f74a2008-07-02 11:05:34 -0700329 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200330 int tid;
331
332 /* does the frame have a qos control field? */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700333 if (ieee80211_is_data_qos(hdr->frame_control)) {
334 u8 *qc = ieee80211_get_qos_ctl(hdr);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200335 /* frame has qos control */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700336 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
337 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
Johannes Berg5cf121c2008-02-25 16:27:43 +0100338 rx->flags |= IEEE80211_RX_AMSDU;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +0200339 else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100340 rx->flags &= ~IEEE80211_RX_AMSDU;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200341 } else {
Johannes Berg1411f9b2008-07-10 10:11:02 +0200342 /*
343 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
344 *
345 * Sequence numbers for management frames, QoS data
346 * frames with a broadcast/multicast address in the
347 * Address 1 field, and all non-QoS data frames sent
348 * by QoS STAs are assigned using an additional single
349 * modulo-4096 counter, [...]
350 *
351 * We also use that counter for non-QoS STAs.
352 */
353 tid = NUM_RX_DATA_QUEUES - 1;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200354 }
Johannes Berg52865df2007-07-27 15:43:22 +0200355
Johannes Berg5cf121c2008-02-25 16:27:43 +0100356 rx->queue = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200357 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
358 * For now, set skb->priority to 0 for other cases. */
359 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100360}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200361
Johannes Berg5cf121c2008-02-25 16:27:43 +0100362static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx)
Johannes Berg38f37142008-01-29 17:07:43 +0100363{
364#ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
Harvey Harrisona7767f92008-07-02 16:30:51 -0700365 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg38f37142008-01-29 17:07:43 +0100366 int hdrlen;
367
Harvey Harrisona7767f92008-07-02 16:30:51 -0700368 if (!ieee80211_is_data_present(hdr->frame_control))
Johannes Berg38f37142008-01-29 17:07:43 +0100369 return;
370
371 /*
372 * Drivers are required to align the payload data in a way that
373 * guarantees that the contained IP header is aligned to a four-
374 * byte boundary. In the case of regular frames, this simply means
375 * aligning the payload to a four-byte boundary (because either
376 * the IP header is directly contained, or IV/RFC1042 headers that
377 * have a length divisible by four are in front of it.
378 *
379 * With A-MSDU frames, however, the payload data address must
380 * yield two modulo four because there are 14-byte 802.3 headers
381 * within the A-MSDU frames that push the IP header further back
382 * to a multiple of four again. Thankfully, the specs were sane
383 * enough this time around to require padding each A-MSDU subframe
384 * to a length that is a multiple of four.
385 *
386 * Padding like atheros hardware adds which is inbetween the 802.11
387 * header and the payload is not supported, the driver is required
388 * to move the 802.11 header further back in that case.
389 */
Harvey Harrisona7767f92008-07-02 16:30:51 -0700390 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg5cf121c2008-02-25 16:27:43 +0100391 if (rx->flags & IEEE80211_RX_AMSDU)
Johannes Berg38f37142008-01-29 17:07:43 +0100392 hdrlen += ETH_HLEN;
393 WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
394#endif
Johannes Berg6e0d1142007-07-27 15:43:22 +0200395}
396
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +0200397
Johannes Berg571ecf62007-07-27 15:43:22 +0200398/* rx handlers */
399
Johannes Berg49461622008-06-30 15:10:45 +0200400static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100401ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200402{
403 struct ieee80211_local *local = rx->local;
404 struct sk_buff *skb = rx->skb;
405
Zhu Yiece8edd2007-11-22 10:53:21 +0800406 if (unlikely(local->sta_hw_scanning))
Johannes Berg5cf121c2008-02-25 16:27:43 +0100407 return ieee80211_sta_rx_scan(rx->dev, skb, rx->status);
Zhu Yiece8edd2007-11-22 10:53:21 +0800408
409 if (unlikely(local->sta_sw_scanning)) {
410 /* drop all the other packets during a software scan anyway */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100411 if (ieee80211_sta_rx_scan(rx->dev, skb, rx->status)
Johannes Berg9ae54c82008-01-31 19:48:20 +0100412 != RX_QUEUED)
Zhu Yiece8edd2007-11-22 10:53:21 +0800413 dev_kfree_skb(skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100414 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200415 }
416
Johannes Berg5cf121c2008-02-25 16:27:43 +0100417 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200418 /* scanning finished during invoking of handlers */
419 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100420 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200421 }
422
Johannes Berg9ae54c82008-01-31 19:48:20 +0100423 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200424}
425
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100426static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100427ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100428{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700429 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
430 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100431
Harvey Harrisona7767f92008-07-02 16:30:51 -0700432 if (ieee80211_is_data(hdr->frame_control)) {
433 if (!ieee80211_has_a4(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100434 return RX_DROP_MONITOR;
435 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
436 return RX_DROP_MONITOR;
437 }
438
439 /* If there is not an established peer link and this is not a peer link
440 * establisment frame, beacon or probe, drop the frame.
441 */
442
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800443 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100444 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100445
Harvey Harrisona7767f92008-07-02 16:30:51 -0700446 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100447 return RX_DROP_MONITOR;
448
Harvey Harrisona7767f92008-07-02 16:30:51 -0700449 if (ieee80211_is_action(hdr->frame_control)) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100450 mgmt = (struct ieee80211_mgmt *)hdr;
451 if (mgmt->u.action.category != PLINK_CATEGORY)
452 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100453 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100454 }
455
Harvey Harrisona7767f92008-07-02 16:30:51 -0700456 if (ieee80211_is_probe_req(hdr->frame_control) ||
457 ieee80211_is_probe_resp(hdr->frame_control) ||
458 ieee80211_is_beacon(hdr->frame_control))
459 return RX_CONTINUE;
460
461 return RX_DROP_MONITOR;
462
463 }
464
465#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
466
467 if (ieee80211_is_data(hdr->frame_control) &&
468 is_multicast_ether_addr(hdr->addr1) &&
469 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->dev))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100470 return RX_DROP_MONITOR;
Johannes Berg902acc72008-02-23 15:17:19 +0100471#undef msh_h_get
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100472
Johannes Berg902acc72008-02-23 15:17:19 +0100473 return RX_CONTINUE;
474}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100475
476
Johannes Berg49461622008-06-30 15:10:45 +0200477static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100478ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200479{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700480 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +0200481
482 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
483 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700484 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100485 rx->sta->last_seq_ctrl[rx->queue] ==
Johannes Berg571ecf62007-07-27 15:43:22 +0200486 hdr->seq_ctrl)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +0100487 if (rx->flags & IEEE80211_RX_RA_MATCH) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200488 rx->local->dot11FrameDuplicateCount++;
489 rx->sta->num_duplicates++;
490 }
Johannes Berge4c26ad2008-01-31 19:48:21 +0100491 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200492 } else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100493 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +0200494 }
495
Johannes Berg571ecf62007-07-27 15:43:22 +0200496 if (unlikely(rx->skb->len < 16)) {
497 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100498 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200499 }
500
Johannes Berg571ecf62007-07-27 15:43:22 +0200501 /* Drop disallowed frame classes based on STA auth/assoc state;
502 * IEEE 802.11, Chap 5.5.
503 *
504 * 80211.o does filtering only based on association state, i.e., it
505 * drops Class 3 frames from not associated stations. hostapd sends
506 * deauth/disassoc frames when needed. In addition, hostapd is
507 * responsible for filtering on both auth and assoc states.
508 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100509
Johannes Berg902acc72008-02-23 15:17:19 +0100510 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100511 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100512
Harvey Harrisona7767f92008-07-02 16:30:51 -0700513 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
514 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg51fb61e2007-12-19 01:31:27 +0100515 rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
Johannes Berg07346f812008-05-03 01:02:02 +0200516 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700517 if ((!ieee80211_has_fromds(hdr->frame_control) &&
518 !ieee80211_has_tods(hdr->frame_control) &&
519 ieee80211_is_data(hdr->frame_control)) ||
520 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200521 /* Drop IBSS frames and frames for other hosts
522 * silently. */
Johannes Berge4c26ad2008-01-31 19:48:21 +0100523 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200524 }
525
Johannes Berge4c26ad2008-01-31 19:48:21 +0100526 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200527 }
528
Johannes Berg9ae54c82008-01-31 19:48:20 +0100529 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +0200530}
531
532
Johannes Berg49461622008-06-30 15:10:45 +0200533static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100534ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
Johannes Berg570bd532007-07-27 15:43:22 +0200535{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700536 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg3017b802007-08-28 17:01:53 -0400537 int keyidx;
538 int hdrlen;
Johannes Berge4c26ad2008-01-31 19:48:21 +0100539 ieee80211_rx_result result = RX_DROP_UNUSABLE;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400540 struct ieee80211_key *stakey = NULL;
Johannes Berg570bd532007-07-27 15:43:22 +0200541
Johannes Berg3017b802007-08-28 17:01:53 -0400542 /*
543 * Key selection 101
544 *
545 * There are three types of keys:
546 * - GTK (group keys)
547 * - PTK (pairwise keys)
548 * - STK (station-to-station pairwise keys)
549 *
550 * When selecting a key, we have to distinguish between multicast
551 * (including broadcast) and unicast frames, the latter can only
552 * use PTKs and STKs while the former always use GTKs. Unless, of
553 * course, actual WEP keys ("pre-RSNA") are used, then unicast
554 * frames can also use key indizes like GTKs. Hence, if we don't
555 * have a PTK/STK we check the key index for a WEP key.
556 *
Johannes Berg8dc06a12007-08-28 17:01:55 -0400557 * Note that in a regular BSS, multicast frames are sent by the
558 * AP only, associated stations unicast the frame to the AP first
559 * which then multicasts it on their behalf.
560 *
Johannes Berg3017b802007-08-28 17:01:53 -0400561 * There is also a slight problem in IBSS mode: GTKs are negotiated
562 * with each station, that is something we don't currently handle.
Johannes Berg8dc06a12007-08-28 17:01:55 -0400563 * The spec seems to expect that one negotiates the same key with
564 * every station but there's no such requirement; VLANs could be
565 * possible.
Johannes Berg3017b802007-08-28 17:01:53 -0400566 */
Johannes Berg571ecf62007-07-27 15:43:22 +0200567
Harvey Harrisona7767f92008-07-02 16:30:51 -0700568 if (!ieee80211_has_protected(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100569 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -0400570
571 /*
Johannes Berg1990af82007-09-26 17:53:15 +0200572 * No point in finding a key and decrypting if the frame is neither
Johannes Berg3017b802007-08-28 17:01:53 -0400573 * addressed to us nor a multicast frame.
574 */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100575 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100576 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -0400577
Johannes Bergd4e46a32007-09-14 11:10:24 -0400578 if (rx->sta)
579 stakey = rcu_dereference(rx->sta->key);
580
581 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
582 rx->key = stakey;
Johannes Berg571ecf62007-07-27 15:43:22 +0200583 } else {
Johannes Berg3017b802007-08-28 17:01:53 -0400584 /*
585 * The device doesn't give us the IV so we won't be
586 * able to look up the key. That's ok though, we
587 * don't need to decrypt the frame, we just won't
588 * be able to keep statistics accurate.
589 * Except for key threshold notifications, should
590 * we somehow allow the driver to tell us which key
591 * the hardware used if this flag is set?
592 */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100593 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
594 (rx->status->flag & RX_FLAG_IV_STRIPPED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100595 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200596
Harvey Harrisona7767f92008-07-02 16:30:51 -0700597 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +0200598
Johannes Berg3017b802007-08-28 17:01:53 -0400599 if (rx->skb->len < 8 + hdrlen)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100600 return RX_DROP_UNUSABLE; /* TODO: count this? */
Johannes Berg571ecf62007-07-27 15:43:22 +0200601
Johannes Berg3017b802007-08-28 17:01:53 -0400602 /*
603 * no need to call ieee80211_wep_get_keyidx,
604 * it verifies a bunch of things we've done already
605 */
606 keyidx = rx->skb->data[hdrlen + 3] >> 6;
607
Johannes Bergd4e46a32007-09-14 11:10:24 -0400608 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
Johannes Berg3017b802007-08-28 17:01:53 -0400609
610 /*
611 * RSNA-protected unicast frames should always be sent with
612 * pairwise or station-to-station keys, but for WEP we allow
613 * using a key index as well.
614 */
Johannes Berg8f20fc22007-08-28 17:01:54 -0400615 if (rx->key && rx->key->conf.alg != ALG_WEP &&
Johannes Berg3017b802007-08-28 17:01:53 -0400616 !is_multicast_ether_addr(hdr->addr1))
617 rx->key = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +0200618 }
619
Johannes Berg3017b802007-08-28 17:01:53 -0400620 if (rx->key) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200621 rx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -0400622 /* TODO: add threshold stuff again */
Johannes Berg1990af82007-09-26 17:53:15 +0200623 } else {
Johannes Berge4c26ad2008-01-31 19:48:21 +0100624 return RX_DROP_MONITOR;
Johannes Berg70f08762007-09-26 17:53:14 +0200625 }
626
Johannes Berg1990af82007-09-26 17:53:15 +0200627 /* Check for weak IVs if possible */
628 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
Harvey Harrisona7767f92008-07-02 16:30:51 -0700629 ieee80211_is_data(hdr->frame_control) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100630 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
631 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
Johannes Berg1990af82007-09-26 17:53:15 +0200632 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
633 rx->sta->wep_weak_iv_count++;
634
Johannes Berg70f08762007-09-26 17:53:14 +0200635 switch (rx->key->conf.alg) {
636 case ALG_WEP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200637 result = ieee80211_crypto_wep_decrypt(rx);
638 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200639 case ALG_TKIP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200640 result = ieee80211_crypto_tkip_decrypt(rx);
641 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200642 case ALG_CCMP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200643 result = ieee80211_crypto_ccmp_decrypt(rx);
644 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200645 }
646
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200647 /* either the frame has been decrypted or will be dropped */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100648 rx->status->flag |= RX_FLAG_DECRYPTED;
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200649
650 return result;
Johannes Berg70f08762007-09-26 17:53:14 +0200651}
652
Johannes Berg571ecf62007-07-27 15:43:22 +0200653static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
654{
655 struct ieee80211_sub_if_data *sdata;
Joe Perches0795af52007-10-03 17:59:30 -0700656 DECLARE_MAC_BUF(mac);
657
Johannes Bergd0709a62008-02-25 16:27:46 +0100658 sdata = sta->sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +0200659
Johannes Berg3e122be2008-07-09 14:40:34 +0200660 atomic_inc(&sdata->bss->num_sta_ps);
Johannes Berg07346f812008-05-03 01:02:02 +0200661 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
Johannes Berg571ecf62007-07-27 15:43:22 +0200662#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700663 printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
664 dev->name, print_mac(mac, sta->addr), sta->aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200665#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
666}
667
668static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
669{
670 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
671 struct sk_buff *skb;
672 int sent = 0;
673 struct ieee80211_sub_if_data *sdata;
Johannes Berge039fa42008-05-15 12:55:29 +0200674 struct ieee80211_tx_info *info;
Joe Perches0795af52007-10-03 17:59:30 -0700675 DECLARE_MAC_BUF(mac);
Johannes Berg571ecf62007-07-27 15:43:22 +0200676
Johannes Bergd0709a62008-02-25 16:27:46 +0100677 sdata = sta->sdata;
Johannes Berg004c8722008-02-20 11:21:35 +0100678
Johannes Berg3e122be2008-07-09 14:40:34 +0200679 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg004c8722008-02-20 11:21:35 +0100680
Johannes Berg07346f812008-05-03 01:02:02 +0200681 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
Johannes Berg004c8722008-02-20 11:21:35 +0100682
683 if (!skb_queue_empty(&sta->ps_tx_buf))
684 sta_info_clear_tim_bit(sta);
685
Johannes Berg571ecf62007-07-27 15:43:22 +0200686#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700687 printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
688 dev->name, print_mac(mac, sta->addr), sta->aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200689#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg004c8722008-02-20 11:21:35 +0100690
Johannes Berg571ecf62007-07-27 15:43:22 +0200691 /* Send all buffered frames to the station */
692 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
Johannes Berge039fa42008-05-15 12:55:29 +0200693 info = IEEE80211_SKB_CB(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200694 sent++;
Johannes Berge039fa42008-05-15 12:55:29 +0200695 info->flags |= IEEE80211_TX_CTL_REQUEUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200696 dev_queue_xmit(skb);
697 }
698 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
Johannes Berge039fa42008-05-15 12:55:29 +0200699 info = IEEE80211_SKB_CB(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200700 local->total_ps_buffered--;
701 sent++;
702#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700703 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
Johannes Berg571ecf62007-07-27 15:43:22 +0200704 "since STA not sleeping anymore\n", dev->name,
Joe Perches0795af52007-10-03 17:59:30 -0700705 print_mac(mac, sta->addr), sta->aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200706#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berge039fa42008-05-15 12:55:29 +0200707 info->flags |= IEEE80211_TX_CTL_REQUEUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200708 dev_queue_xmit(skb);
709 }
710
711 return sent;
712}
713
Johannes Berg49461622008-06-30 15:10:45 +0200714static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100715ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200716{
717 struct sta_info *sta = rx->sta;
718 struct net_device *dev = rx->dev;
Harvey Harrisona7767f92008-07-02 16:30:51 -0700719 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +0200720
721 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +0100722 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200723
724 /* Update last_rx only for IBSS packets which are for the current
725 * BSSID to avoid keeping the current IBSS network alive in cases where
726 * other STAs are using different BSSID. */
Johannes Berg51fb61e2007-12-19 01:31:27 +0100727 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
Ron Rindjunsky71364712007-12-25 17:00:36 +0200728 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
729 IEEE80211_IF_TYPE_IBSS);
Johannes Berg571ecf62007-07-27 15:43:22 +0200730 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
731 sta->last_rx = jiffies;
732 } else
733 if (!is_multicast_ether_addr(hdr->addr1) ||
Johannes Berg51fb61e2007-12-19 01:31:27 +0100734 rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200735 /* Update last_rx only for unicast frames in order to prevent
736 * the Probe Request frames (the only broadcast frames from a
737 * STA in infrastructure mode) from keeping a connection alive.
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100738 * Mesh beacons will update last_rx when if they are found to
739 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +0200740 */
741 sta->last_rx = jiffies;
742 }
743
Johannes Berg5cf121c2008-02-25 16:27:43 +0100744 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100745 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200746
747 sta->rx_fragments++;
748 sta->rx_bytes += rx->skb->len;
Johannes Berg5cf121c2008-02-25 16:27:43 +0100749 sta->last_signal = rx->status->signal;
Bruno Randolf566bfe52008-05-08 19:15:40 +0200750 sta->last_qual = rx->status->qual;
Johannes Berg5cf121c2008-02-25 16:27:43 +0100751 sta->last_noise = rx->status->noise;
Johannes Berg571ecf62007-07-27 15:43:22 +0200752
Johannes Berg3e122be2008-07-09 14:40:34 +0200753 if (!ieee80211_has_morefrags(hdr->frame_control) &&
754 (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP ||
755 rx->sdata->vif.type == IEEE80211_IF_TYPE_VLAN)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200756 /* Change STA power saving mode only in the end of a frame
757 * exchange sequence */
Johannes Berg07346f812008-05-03 01:02:02 +0200758 if (test_sta_flags(sta, WLAN_STA_PS) &&
Harvey Harrisona7767f92008-07-02 16:30:51 -0700759 !ieee80211_has_pm(hdr->frame_control))
Johannes Berg5cf121c2008-02-25 16:27:43 +0100760 rx->sent_ps_buffered += ap_sta_ps_end(dev, sta);
Johannes Berg07346f812008-05-03 01:02:02 +0200761 else if (!test_sta_flags(sta, WLAN_STA_PS) &&
Harvey Harrisona7767f92008-07-02 16:30:51 -0700762 ieee80211_has_pm(hdr->frame_control))
Johannes Berg571ecf62007-07-27 15:43:22 +0200763 ap_sta_ps_start(dev, sta);
764 }
765
766 /* Drop data::nullfunc frames silently, since they are used only to
767 * control station power saving mode. */
Harvey Harrisona7767f92008-07-02 16:30:51 -0700768 if (ieee80211_is_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200769 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
770 /* Update counter and free packet here to avoid counting this
771 * as a dropped packed. */
772 sta->rx_packets++;
773 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100774 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200775 }
776
Johannes Berg9ae54c82008-01-31 19:48:20 +0100777 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200778} /* ieee80211_rx_h_sta_process */
779
Johannes Berg571ecf62007-07-27 15:43:22 +0200780static inline struct ieee80211_fragment_entry *
781ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
782 unsigned int frag, unsigned int seq, int rx_queue,
783 struct sk_buff **skb)
784{
785 struct ieee80211_fragment_entry *entry;
786 int idx;
787
788 idx = sdata->fragment_next;
789 entry = &sdata->fragments[sdata->fragment_next++];
790 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
791 sdata->fragment_next = 0;
792
793 if (!skb_queue_empty(&entry->skb_list)) {
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200794#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg571ecf62007-07-27 15:43:22 +0200795 struct ieee80211_hdr *hdr =
796 (struct ieee80211_hdr *) entry->skb_list.next->data;
Joe Perches0795af52007-10-03 17:59:30 -0700797 DECLARE_MAC_BUF(mac);
798 DECLARE_MAC_BUF(mac2);
Johannes Berg571ecf62007-07-27 15:43:22 +0200799 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
800 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
Joe Perches0795af52007-10-03 17:59:30 -0700801 "addr1=%s addr2=%s\n",
Johannes Berg571ecf62007-07-27 15:43:22 +0200802 sdata->dev->name, idx,
803 jiffies - entry->first_frag_time, entry->seq,
Joe Perches0795af52007-10-03 17:59:30 -0700804 entry->last_frag, print_mac(mac, hdr->addr1),
805 print_mac(mac2, hdr->addr2));
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200806#endif
Johannes Berg571ecf62007-07-27 15:43:22 +0200807 __skb_queue_purge(&entry->skb_list);
808 }
809
810 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
811 *skb = NULL;
812 entry->first_frag_time = jiffies;
813 entry->seq = seq;
814 entry->rx_queue = rx_queue;
815 entry->last_frag = frag;
816 entry->ccmp = 0;
817 entry->extra_len = 0;
818
819 return entry;
820}
821
822static inline struct ieee80211_fragment_entry *
823ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700824 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +0200825 int rx_queue, struct ieee80211_hdr *hdr)
826{
827 struct ieee80211_fragment_entry *entry;
828 int i, idx;
829
830 idx = sdata->fragment_next;
831 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
832 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +0200833
834 idx--;
835 if (idx < 0)
836 idx = IEEE80211_FRAGMENT_MAX - 1;
837
838 entry = &sdata->fragments[idx];
839 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
840 entry->rx_queue != rx_queue ||
841 entry->last_frag + 1 != frag)
842 continue;
843
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700844 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +0200845
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700846 /*
847 * Check ftype and addresses are equal, else check next fragment
848 */
849 if (((hdr->frame_control ^ f_hdr->frame_control) &
850 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Johannes Berg571ecf62007-07-27 15:43:22 +0200851 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
852 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
853 continue;
854
S.Çağlar Onurab466232008-02-14 17:36:47 +0200855 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200856 __skb_queue_purge(&entry->skb_list);
857 continue;
858 }
859 return entry;
860 }
861
862 return NULL;
863}
864
Johannes Berg49461622008-06-30 15:10:45 +0200865static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100866ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200867{
868 struct ieee80211_hdr *hdr;
869 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -0700870 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +0200871 unsigned int frag, seq;
872 struct ieee80211_fragment_entry *entry;
873 struct sk_buff *skb;
Joe Perches0795af52007-10-03 17:59:30 -0700874 DECLARE_MAC_BUF(mac);
Johannes Berg571ecf62007-07-27 15:43:22 +0200875
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700876 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -0700877 fc = hdr->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +0200878 sc = le16_to_cpu(hdr->seq_ctrl);
879 frag = sc & IEEE80211_SCTL_FRAG;
880
Harvey Harrison358c8d92008-07-15 18:44:13 -0700881 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
Johannes Berg571ecf62007-07-27 15:43:22 +0200882 (rx->skb)->len < 24 ||
883 is_multicast_ether_addr(hdr->addr1))) {
884 /* not fragmented */
885 goto out;
886 }
887 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
888
889 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
890
891 if (frag == 0) {
892 /* This is the first fragment of a new frame. */
893 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg5cf121c2008-02-25 16:27:43 +0100894 rx->queue, &(rx->skb));
Johannes Berg8f20fc22007-08-28 17:01:54 -0400895 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
Harvey Harrison358c8d92008-07-15 18:44:13 -0700896 ieee80211_has_protected(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200897 /* Store CCMP PN so that we can verify that the next
898 * fragment has a sequential PN value. */
899 entry->ccmp = 1;
900 memcpy(entry->last_pn,
Johannes Berg5cf121c2008-02-25 16:27:43 +0100901 rx->key->u.ccmp.rx_pn[rx->queue],
Johannes Berg571ecf62007-07-27 15:43:22 +0200902 CCMP_PN_LEN);
903 }
Johannes Berg9ae54c82008-01-31 19:48:20 +0100904 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200905 }
906
907 /* This is a fragment for a frame that should already be pending in
908 * fragment cache. Add this fragment to the end of the pending entry.
909 */
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700910 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +0200911 if (!entry) {
912 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100913 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200914 }
915
916 /* Verify that MPDUs within one MSDU have sequential PN values.
917 * (IEEE 802.11i, 8.3.3.4.5) */
918 if (entry->ccmp) {
919 int i;
920 u8 pn[CCMP_PN_LEN], *rpn;
Johannes Berg8f20fc22007-08-28 17:01:54 -0400921 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100922 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200923 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
924 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
925 pn[i]++;
926 if (pn[i])
927 break;
928 }
Johannes Berg5cf121c2008-02-25 16:27:43 +0100929 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200930 if (memcmp(pn, rpn, CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +0100931 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200932 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
933 }
934
Harvey Harrison358c8d92008-07-15 18:44:13 -0700935 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +0200936 __skb_queue_tail(&entry->skb_list, rx->skb);
937 entry->last_frag = frag;
938 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -0700939 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200940 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +0100941 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200942 }
943
944 rx->skb = __skb_dequeue(&entry->skb_list);
945 if (skb_tailroom(rx->skb) < entry->extra_len) {
946 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
947 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
948 GFP_ATOMIC))) {
949 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
950 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100951 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200952 }
953 }
954 while ((skb = __skb_dequeue(&entry->skb_list))) {
955 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
956 dev_kfree_skb(skb);
957 }
958
959 /* Complete frame has been reassembled - process it now */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100960 rx->flags |= IEEE80211_RX_FRAGMENTED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200961
962 out:
963 if (rx->sta)
964 rx->sta->rx_packets++;
965 if (is_multicast_ether_addr(hdr->addr1))
966 rx->local->dot11MulticastReceivedFrameCount++;
967 else
968 ieee80211_led_rx(rx->local);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100969 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200970}
971
Johannes Berg49461622008-06-30 15:10:45 +0200972static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100973ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200974{
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +0200975 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
Johannes Berg571ecf62007-07-27 15:43:22 +0200976 struct sk_buff *skb;
977 int no_pending_pkts;
Joe Perches0795af52007-10-03 17:59:30 -0700978 DECLARE_MAC_BUF(mac);
Harvey Harrison358c8d92008-07-15 18:44:13 -0700979 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +0200980
Harvey Harrison358c8d92008-07-15 18:44:13 -0700981 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
Johannes Berg5cf121c2008-02-25 16:27:43 +0100982 !(rx->flags & IEEE80211_RX_RA_MATCH)))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100983 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200984
Johannes Berg51fb61e2007-12-19 01:31:27 +0100985 if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
986 (sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
Johannes Berge4c26ad2008-01-31 19:48:21 +0100987 return RX_DROP_UNUSABLE;
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +0200988
Johannes Berg571ecf62007-07-27 15:43:22 +0200989 skb = skb_dequeue(&rx->sta->tx_filtered);
990 if (!skb) {
991 skb = skb_dequeue(&rx->sta->ps_tx_buf);
992 if (skb)
993 rx->local->total_ps_buffered--;
994 }
995 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
996 skb_queue_empty(&rx->sta->ps_tx_buf);
997
998 if (skb) {
999 struct ieee80211_hdr *hdr =
1000 (struct ieee80211_hdr *) skb->data;
1001
Johannes Berg4a9a66e2008-02-19 11:31:14 +01001002 /*
1003 * Tell TX path to send one frame even though the STA may
1004 * still remain is PS mode after this frame exchange.
1005 */
Johannes Berg07346f812008-05-03 01:02:02 +02001006 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
Johannes Berg571ecf62007-07-27 15:43:22 +02001007
1008#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -07001009 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
1010 print_mac(mac, rx->sta->addr), rx->sta->aid,
Johannes Berg571ecf62007-07-27 15:43:22 +02001011 skb_queue_len(&rx->sta->ps_tx_buf));
1012#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1013
1014 /* Use MoreData flag to indicate whether there are more
1015 * buffered frames for this STA */
Johannes Berg836341a2008-02-20 02:07:21 +01001016 if (no_pending_pkts)
Johannes Berg571ecf62007-07-27 15:43:22 +02001017 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
Johannes Berg836341a2008-02-20 02:07:21 +01001018 else
Johannes Berg571ecf62007-07-27 15:43:22 +02001019 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1020
1021 dev_queue_xmit(skb);
1022
Johannes Berg004c8722008-02-20 11:21:35 +01001023 if (no_pending_pkts)
1024 sta_info_clear_tim_bit(rx->sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001025#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg5cf121c2008-02-25 16:27:43 +01001026 } else if (!rx->sent_ps_buffered) {
Johannes Berg004c8722008-02-20 11:21:35 +01001027 /*
1028 * FIXME: This can be the result of a race condition between
1029 * us expiring a frame and the station polling for it.
1030 * Should we send it a null-func frame indicating we
1031 * have nothing buffered for it?
1032 */
Joe Perches0795af52007-10-03 17:59:30 -07001033 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001034 "though there are no buffered frames for it\n",
Joe Perches0795af52007-10-03 17:59:30 -07001035 rx->dev->name, print_mac(mac, rx->sta->addr));
Johannes Berg571ecf62007-07-27 15:43:22 +02001036#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg571ecf62007-07-27 15:43:22 +02001037 }
1038
Johannes Berg9ae54c82008-01-31 19:48:20 +01001039 /* Free PS Poll skb here instead of returning RX_DROP that would
Johannes Berg571ecf62007-07-27 15:43:22 +02001040 * count as an dropped frame. */
1041 dev_kfree_skb(rx->skb);
1042
Johannes Berg9ae54c82008-01-31 19:48:20 +01001043 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001044}
1045
Johannes Berg49461622008-06-30 15:10:45 +02001046static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001047ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +02001048{
Johannes Berg6e0d1142007-07-27 15:43:22 +02001049 u8 *data = rx->skb->data;
Harvey Harrison238f74a2008-07-02 11:05:34 -07001050 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001051
Harvey Harrison238f74a2008-07-02 11:05:34 -07001052 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001053 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001054
1055 /* remove the qos control field, update frame type and meta-data */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001056 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1057 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1058 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001059 /* change frame type to non QOS */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001060 rx->fc &= ~IEEE80211_STYPE_QOS_DATA;
1061 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001062
Johannes Berg9ae54c82008-01-31 19:48:20 +01001063 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001064}
1065
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001066static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001067ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001068{
Johannes Berg07346f812008-05-03 01:02:02 +02001069 if (unlikely(!rx->sta ||
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001070 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001071 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001072
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001073 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001074}
1075
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001076static int
Harvey Harrison358c8d92008-07-15 18:44:13 -07001077ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02001078{
Johannes Berg3017b802007-08-28 17:01:53 -04001079 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001080 * Pass through unencrypted frames if the hardware has
1081 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001082 */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001083 if (rx->status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001084 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001085
1086 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001087 if (unlikely(!ieee80211_has_protected(fc) &&
1088 !ieee80211_is_nullfunc(fc) &&
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001089 (rx->key || rx->sdata->drop_unencrypted)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001090 return -EACCES;
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001091
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001092 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001093}
1094
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001095static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001096ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001097{
1098 struct net_device *dev = rx->dev;
Johannes Berg571ecf62007-07-27 15:43:22 +02001099 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001100 u16 hdrlen, ethertype;
Johannes Berg571ecf62007-07-27 15:43:22 +02001101 u8 *payload;
1102 u8 dst[ETH_ALEN];
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301103 u8 src[ETH_ALEN] __aligned(2);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001104 struct sk_buff *skb = rx->skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001105 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Joe Perches0795af52007-10-03 17:59:30 -07001106 DECLARE_MAC_BUF(mac);
1107 DECLARE_MAC_BUF(mac2);
1108 DECLARE_MAC_BUF(mac3);
1109 DECLARE_MAC_BUF(mac4);
Johannes Berg571ecf62007-07-27 15:43:22 +02001110
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001111 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001112 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001113
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001114 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +02001115
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001116 if (ieee80211_vif_is_mesh(&sdata->vif))
1117 hdrlen += ieee80211_get_mesh_hdrlen(
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001118 (struct ieee80211s_hdr *) (skb->data + hdrlen));
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001119
Johannes Berg571ecf62007-07-27 15:43:22 +02001120 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1121 * header
1122 * IEEE 802.11 address fields:
1123 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1124 * 0 0 DA SA BSSID n/a
1125 * 0 1 DA BSSID SA n/a
1126 * 1 0 BSSID SA DA n/a
1127 * 1 1 RA TA DA SA
1128 */
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001129 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
1130 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
Johannes Berg571ecf62007-07-27 15:43:22 +02001131
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001132 switch (hdr->frame_control &
1133 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1134 case __constant_cpu_to_le16(IEEE80211_FCTL_TODS):
Johannes Berg51fb61e2007-12-19 01:31:27 +01001135 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP &&
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001136 sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001137 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001138 break;
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001139 case __constant_cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1140 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS &&
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001141 sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001142 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001143 break;
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001144 case __constant_cpu_to_le16(IEEE80211_FCTL_FROMDS):
Johannes Berg51fb61e2007-12-19 01:31:27 +01001145 if (sdata->vif.type != IEEE80211_IF_TYPE_STA ||
John W. Linvilleb3316152007-08-28 17:01:55 -04001146 (is_multicast_ether_addr(dst) &&
1147 !compare_ether_addr(src, dev->dev_addr)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001148 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001149 break;
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001150 case __constant_cpu_to_le16(0):
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001151 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001152 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001153 break;
1154 }
1155
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001156 if (unlikely(skb->len - hdrlen < 8))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001157 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001158
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001159 payload = skb->data + hdrlen;
Johannes Berg571ecf62007-07-27 15:43:22 +02001160 ethertype = (payload[6] << 8) | payload[7];
1161
1162 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1163 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1164 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1165 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1166 * replace EtherType */
1167 skb_pull(skb, hdrlen + 6);
1168 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1169 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1170 } else {
1171 struct ethhdr *ehdr;
1172 __be16 len;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001173
Johannes Berg571ecf62007-07-27 15:43:22 +02001174 skb_pull(skb, hdrlen);
1175 len = htons(skb->len);
1176 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1177 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1178 memcpy(ehdr->h_source, src, ETH_ALEN);
1179 ehdr->h_proto = len;
1180 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001181 return 0;
1182}
Johannes Berg571ecf62007-07-27 15:43:22 +02001183
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001184/*
1185 * requires that rx->skb is a frame with ethernet header
1186 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001187static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001188{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301189 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001190 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1191 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1192
1193 /*
1194 * Allow EAPOL frames to us/the PAE group address regardless
1195 * of whether the frame was encrypted or not.
1196 */
1197 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1198 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1199 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1200 return true;
1201
1202 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07001203 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001204 return false;
1205
1206 return true;
1207}
1208
1209/*
1210 * requires that rx->skb is a frame with ethernet header
1211 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001212static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01001213ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001214{
1215 struct net_device *dev = rx->dev;
1216 struct ieee80211_local *local = rx->local;
1217 struct sk_buff *skb, *xmit_skb;
1218 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001219 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1220 struct sta_info *dsta;
Johannes Berg571ecf62007-07-27 15:43:22 +02001221
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001222 skb = rx->skb;
1223 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001224
Johannes Berg51fb61e2007-12-19 01:31:27 +01001225 if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP ||
1226 sdata->vif.type == IEEE80211_IF_TYPE_VLAN) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +01001227 (rx->flags & IEEE80211_RX_RA_MATCH)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001228 if (is_multicast_ether_addr(ehdr->h_dest)) {
1229 /*
1230 * send multicast frames both to higher layers in
1231 * local net stack and back to the wireless medium
1232 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001233 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1234 if (!xmit_skb && net_ratelimit())
Johannes Berg571ecf62007-07-27 15:43:22 +02001235 printk(KERN_DEBUG "%s: failed to clone "
1236 "multicast frame\n", dev->name);
1237 } else {
Johannes Berg571ecf62007-07-27 15:43:22 +02001238 dsta = sta_info_get(local, skb->data);
Johannes Bergd0709a62008-02-25 16:27:46 +01001239 if (dsta && dsta->sdata->dev == dev) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001240 /*
1241 * The destination station is associated to
1242 * this AP (in this VLAN), so send the frame
1243 * directly to it and do not pass it to local
1244 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02001245 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001246 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001247 skb = NULL;
1248 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001249 }
1250 }
1251
1252 if (skb) {
1253 /* deliver to local stack */
1254 skb->protocol = eth_type_trans(skb, dev);
1255 memset(skb->cb, 0, sizeof(skb->cb));
1256 netif_rx(skb);
1257 }
1258
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001259 if (xmit_skb) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001260 /* send to wireless media */
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09001261 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001262 skb_reset_network_header(xmit_skb);
1263 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001264 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001265 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001266}
1267
Johannes Berg49461622008-06-30 15:10:45 +02001268static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001269ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001270{
1271 struct net_device *dev = rx->dev;
1272 struct ieee80211_local *local = rx->local;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001273 u16 ethertype;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001274 u8 *payload;
1275 struct sk_buff *skb = rx->skb, *frame = NULL;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001276 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1277 __le16 fc = hdr->frame_control;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001278 const struct ethhdr *eth;
1279 int remaining, err;
1280 u8 dst[ETH_ALEN];
1281 u8 src[ETH_ALEN];
1282 DECLARE_MAC_BUF(mac);
1283
Harvey Harrison358c8d92008-07-15 18:44:13 -07001284 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001285 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001286
Harvey Harrison358c8d92008-07-15 18:44:13 -07001287 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001288 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001289
Johannes Berg5cf121c2008-02-25 16:27:43 +01001290 if (!(rx->flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001291 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001292
1293 err = ieee80211_data_to_8023(rx);
1294 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001295 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001296
1297 skb->dev = dev;
1298
1299 dev->stats.rx_packets++;
1300 dev->stats.rx_bytes += skb->len;
1301
1302 /* skip the wrapping header */
1303 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1304 if (!eth)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001305 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001306
1307 while (skb != frame) {
1308 u8 padding;
1309 __be16 len = eth->h_proto;
1310 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1311
1312 remaining = skb->len;
1313 memcpy(dst, eth->h_dest, ETH_ALEN);
1314 memcpy(src, eth->h_source, ETH_ALEN);
1315
1316 padding = ((4 - subframe_len) & 0x3);
1317 /* the last MSDU has no padding */
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001318 if (subframe_len > remaining)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001319 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001320
1321 skb_pull(skb, sizeof(struct ethhdr));
1322 /* if last subframe reuse skb */
1323 if (remaining <= subframe_len + padding)
1324 frame = skb;
1325 else {
1326 frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1327 subframe_len);
1328
1329 if (frame == NULL)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001330 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001331
1332 skb_reserve(frame, local->hw.extra_tx_headroom +
1333 sizeof(struct ethhdr));
1334 memcpy(skb_put(frame, ntohs(len)), skb->data,
1335 ntohs(len));
1336
1337 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1338 padding);
1339 if (!eth) {
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001340 dev_kfree_skb(frame);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001341 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001342 }
1343 }
1344
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001345 skb_reset_network_header(frame);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001346 frame->dev = dev;
1347 frame->priority = skb->priority;
1348 rx->skb = frame;
1349
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001350 payload = frame->data;
1351 ethertype = (payload[6] << 8) | payload[7];
1352
1353 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001354 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1355 compare_ether_addr(payload,
1356 bridge_tunnel_header) == 0)) {
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001357 /* remove RFC1042 or Bridge-Tunnel
1358 * encapsulation and replace EtherType */
1359 skb_pull(frame, 6);
1360 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1361 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1362 } else {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001363 memcpy(skb_push(frame, sizeof(__be16)),
1364 &len, sizeof(__be16));
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001365 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1366 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1367 }
1368
Harvey Harrison358c8d92008-07-15 18:44:13 -07001369 if (!ieee80211_frame_allowed(rx, fc)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001370 if (skb == frame) /* last frame */
Johannes Berge4c26ad2008-01-31 19:48:21 +01001371 return RX_DROP_UNUSABLE;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001372 dev_kfree_skb(frame);
1373 continue;
1374 }
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001375
1376 ieee80211_deliver_skb(rx);
1377 }
1378
Johannes Berg9ae54c82008-01-31 19:48:20 +01001379 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001380}
1381
Johannes Berg49461622008-06-30 15:10:45 +02001382static ieee80211_rx_result debug_noinline
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001383ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1384{
1385 struct ieee80211_hdr *hdr;
1386 struct ieee80211s_hdr *mesh_hdr;
1387 unsigned int hdrlen;
1388 struct sk_buff *skb = rx->skb, *fwd_skb;
1389
1390 hdr = (struct ieee80211_hdr *) skb->data;
1391 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1392 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1393
1394 if (!ieee80211_is_data(hdr->frame_control))
1395 return RX_CONTINUE;
1396
1397 if (!mesh_hdr->ttl)
1398 /* illegal frame */
1399 return RX_DROP_MONITOR;
1400
1401 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1402 return RX_CONTINUE;
1403
1404 mesh_hdr->ttl--;
1405
1406 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1407 if (!mesh_hdr->ttl)
1408 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.sta,
1409 dropped_frames_ttl);
1410 else {
1411 struct ieee80211_hdr *fwd_hdr;
1412 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1413
1414 if (!fwd_skb && net_ratelimit())
1415 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1416 rx->dev->name);
1417
1418 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1419 /*
1420 * Save TA to addr1 to send TA a path error if a
1421 * suitable next hop is not found
1422 */
1423 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1424 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1425 fwd_skb->dev = rx->local->mdev;
1426 fwd_skb->iif = rx->dev->ifindex;
1427 dev_queue_xmit(fwd_skb);
1428 }
1429 }
1430
1431 if (is_multicast_ether_addr(hdr->addr3) ||
1432 rx->dev->flags & IFF_PROMISC)
1433 return RX_CONTINUE;
1434 else
1435 return RX_DROP_MONITOR;
1436}
1437
1438
1439static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001440ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001441{
1442 struct net_device *dev = rx->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001443 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1444 __le16 fc = hdr->frame_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001445 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001446
Harvey Harrison358c8d92008-07-15 18:44:13 -07001447 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001448 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001449
Harvey Harrison358c8d92008-07-15 18:44:13 -07001450 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001451 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001452
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001453 err = ieee80211_data_to_8023(rx);
1454 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001455 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001456
Harvey Harrison358c8d92008-07-15 18:44:13 -07001457 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001458 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001459
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001460 rx->skb->dev = dev;
1461
1462 dev->stats.rx_packets++;
1463 dev->stats.rx_bytes += rx->skb->len;
1464
1465 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02001466
Johannes Berg9ae54c82008-01-31 19:48:20 +01001467 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001468}
1469
Johannes Berg49461622008-06-30 15:10:45 +02001470static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001471ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
Ron Rindjunsky71364712007-12-25 17:00:36 +02001472{
1473 struct ieee80211_local *local = rx->local;
1474 struct ieee80211_hw *hw = &local->hw;
1475 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07001476 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001477 struct tid_ampdu_rx *tid_agg_rx;
1478 u16 start_seq_num;
1479 u16 tid;
1480
Harvey Harrisona7767f92008-07-02 16:30:51 -07001481 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001482 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001483
Harvey Harrisona7767f92008-07-02 16:30:51 -07001484 if (ieee80211_is_back_req(bar->frame_control)) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001485 if (!rx->sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001486 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001487 tid = le16_to_cpu(bar->control) >> 12;
Ron Rindjunskycee24a32008-03-26 20:36:03 +02001488 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1489 != HT_AGG_STATE_OPERATIONAL)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001490 return RX_CONTINUE;
Ron Rindjunskycee24a32008-03-26 20:36:03 +02001491 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
Ron Rindjunsky71364712007-12-25 17:00:36 +02001492
1493 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1494
1495 /* reset session timer */
1496 if (tid_agg_rx->timeout) {
1497 unsigned long expires =
1498 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1499 mod_timer(&tid_agg_rx->session_timer, expires);
1500 }
1501
1502 /* manage reordering buffer according to requested */
1503 /* sequence number */
1504 rcu_read_lock();
1505 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1506 start_seq_num, 1);
1507 rcu_read_unlock();
Johannes Berge4c26ad2008-01-31 19:48:21 +01001508 return RX_DROP_UNUSABLE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001509 }
1510
Johannes Berg9ae54c82008-01-31 19:48:20 +01001511 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001512}
1513
Johannes Berg49461622008-06-30 15:10:45 +02001514static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001515ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001516{
1517 struct ieee80211_sub_if_data *sdata;
1518
Johannes Berg5cf121c2008-02-25 16:27:43 +01001519 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001520 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001521
1522 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
Johannes Berg51fb61e2007-12-19 01:31:27 +01001523 if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001524 sdata->vif.type == IEEE80211_IF_TYPE_IBSS ||
1525 sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) &&
Johannes Bergddd3d2b2007-09-26 17:53:20 +02001526 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
Johannes Berg5cf121c2008-02-25 16:27:43 +01001527 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->status);
Johannes Bergf9d540e2007-09-28 14:02:09 +02001528 else
Johannes Berge4c26ad2008-01-31 19:48:21 +01001529 return RX_DROP_MONITOR;
Johannes Bergf9d540e2007-09-28 14:02:09 +02001530
Johannes Berg9ae54c82008-01-31 19:48:20 +01001531 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001532}
1533
Johannes Berg571ecf62007-07-27 15:43:22 +02001534static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1535 struct ieee80211_hdr *hdr,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001536 struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001537{
Harvey Harrisona7767f92008-07-02 16:30:51 -07001538 int keyidx;
1539 unsigned int hdrlen;
Joe Perches0795af52007-10-03 17:59:30 -07001540 DECLARE_MAC_BUF(mac);
1541 DECLARE_MAC_BUF(mac2);
Johannes Berg571ecf62007-07-27 15:43:22 +02001542
Harvey Harrisona7767f92008-07-02 16:30:51 -07001543 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +02001544 if (rx->skb->len >= hdrlen + 4)
1545 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1546 else
1547 keyidx = -1;
1548
Johannes Berg8944b792008-01-31 19:48:26 +01001549 if (!rx->sta) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001550 /*
1551 * Some hardware seem to generate incorrect Michael MIC
1552 * reports; ignore them to avoid triggering countermeasures.
1553 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001554 goto ignore;
1555 }
1556
Harvey Harrisona7767f92008-07-02 16:30:51 -07001557 if (!ieee80211_has_protected(hdr->frame_control))
Johannes Berg571ecf62007-07-27 15:43:22 +02001558 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001559
Johannes Berg51fb61e2007-12-19 01:31:27 +01001560 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001561 /*
1562 * APs with pairwise keys should never receive Michael MIC
1563 * errors for non-zero keyidx because these are reserved for
1564 * group keys and only the AP is sending real multicast
1565 * frames in the BSS.
1566 */
Johannes Bergeb063c12007-08-28 17:01:53 -04001567 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001568 }
1569
Harvey Harrisona7767f92008-07-02 16:30:51 -07001570 if (!ieee80211_is_data(hdr->frame_control) &&
1571 !ieee80211_is_auth(hdr->frame_control))
Johannes Berg571ecf62007-07-27 15:43:22 +02001572 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001573
Johannes Bergeb063c12007-08-28 17:01:53 -04001574 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001575 ignore:
1576 dev_kfree_skb(rx->skb);
1577 rx->skb = NULL;
1578}
1579
Johannes Berg5cf121c2008-02-25 16:27:43 +01001580/* TODO: use IEEE80211_RX_FRAGMENTED */
1581static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
Michael Wu3d30d942008-01-31 19:48:27 +01001582{
1583 struct ieee80211_sub_if_data *sdata;
1584 struct ieee80211_local *local = rx->local;
1585 struct ieee80211_rtap_hdr {
1586 struct ieee80211_radiotap_header hdr;
1587 u8 flags;
1588 u8 rate;
1589 __le16 chan_freq;
1590 __le16 chan_flags;
1591 } __attribute__ ((packed)) *rthdr;
1592 struct sk_buff *skb = rx->skb, *skb2;
1593 struct net_device *prev_dev = NULL;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001594 struct ieee80211_rx_status *status = rx->status;
Michael Wu3d30d942008-01-31 19:48:27 +01001595
Johannes Berg5cf121c2008-02-25 16:27:43 +01001596 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
Michael Wu3d30d942008-01-31 19:48:27 +01001597 goto out_free_skb;
1598
1599 if (skb_headroom(skb) < sizeof(*rthdr) &&
1600 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1601 goto out_free_skb;
1602
1603 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1604 memset(rthdr, 0, sizeof(*rthdr));
1605 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1606 rthdr->hdr.it_present =
1607 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1608 (1 << IEEE80211_RADIOTAP_RATE) |
1609 (1 << IEEE80211_RADIOTAP_CHANNEL));
1610
Johannes Berg5cf121c2008-02-25 16:27:43 +01001611 rthdr->rate = rx->rate->bitrate / 5;
Michael Wu3d30d942008-01-31 19:48:27 +01001612 rthdr->chan_freq = cpu_to_le16(status->freq);
1613
1614 if (status->band == IEEE80211_BAND_5GHZ)
1615 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1616 IEEE80211_CHAN_5GHZ);
1617 else
1618 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1619 IEEE80211_CHAN_2GHZ);
1620
1621 skb_set_mac_header(skb, 0);
1622 skb->ip_summed = CHECKSUM_UNNECESSARY;
1623 skb->pkt_type = PACKET_OTHERHOST;
1624 skb->protocol = htons(ETH_P_802_2);
1625
1626 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1627 if (!netif_running(sdata->dev))
1628 continue;
1629
1630 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR ||
1631 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1632 continue;
1633
1634 if (prev_dev) {
1635 skb2 = skb_clone(skb, GFP_ATOMIC);
1636 if (skb2) {
1637 skb2->dev = prev_dev;
1638 netif_rx(skb2);
1639 }
1640 }
1641
1642 prev_dev = sdata->dev;
1643 sdata->dev->stats.rx_packets++;
1644 sdata->dev->stats.rx_bytes += skb->len;
1645 }
1646
1647 if (prev_dev) {
1648 skb->dev = prev_dev;
1649 netif_rx(skb);
1650 skb = NULL;
1651 } else
1652 goto out_free_skb;
1653
Johannes Berg5cf121c2008-02-25 16:27:43 +01001654 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
Michael Wu3d30d942008-01-31 19:48:27 +01001655 return;
1656
1657 out_free_skb:
1658 dev_kfree_skb(skb);
1659}
1660
Johannes Berg571ecf62007-07-27 15:43:22 +02001661
Johannes Berg8944b792008-01-31 19:48:26 +01001662static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001663 struct ieee80211_rx_data *rx,
Johannes Berg8944b792008-01-31 19:48:26 +01001664 struct sk_buff *skb)
Johannes Berg58905292008-01-31 19:48:25 +01001665{
Johannes Berg58905292008-01-31 19:48:25 +01001666 ieee80211_rx_result res = RX_DROP_MONITOR;
1667
Johannes Berg8944b792008-01-31 19:48:26 +01001668 rx->skb = skb;
1669 rx->sdata = sdata;
1670 rx->dev = sdata->dev;
1671
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001672#define CALL_RXH(rxh) \
1673 do { \
1674 res = rxh(rx); \
1675 if (res != RX_CONTINUE) \
1676 goto rxh_done; \
1677 } while (0);
Johannes Berg58905292008-01-31 19:48:25 +01001678
Johannes Berg49461622008-06-30 15:10:45 +02001679 CALL_RXH(ieee80211_rx_h_passive_scan)
1680 CALL_RXH(ieee80211_rx_h_check)
1681 CALL_RXH(ieee80211_rx_h_decrypt)
1682 CALL_RXH(ieee80211_rx_h_sta_process)
1683 CALL_RXH(ieee80211_rx_h_defragment)
1684 CALL_RXH(ieee80211_rx_h_ps_poll)
1685 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1686 /* must be after MMIC verify so header is counted in MPDU mic */
1687 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1688 CALL_RXH(ieee80211_rx_h_amsdu)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001689 if (ieee80211_vif_is_mesh(&sdata->vif))
1690 CALL_RXH(ieee80211_rx_h_mesh_fwding);
Johannes Berg49461622008-06-30 15:10:45 +02001691 CALL_RXH(ieee80211_rx_h_data)
1692 CALL_RXH(ieee80211_rx_h_ctrl)
1693 CALL_RXH(ieee80211_rx_h_mgmt)
Johannes Berg58905292008-01-31 19:48:25 +01001694
Johannes Berg49461622008-06-30 15:10:45 +02001695#undef CALL_RXH
1696
1697 rxh_done:
Johannes Berg58905292008-01-31 19:48:25 +01001698 switch (res) {
Michael Wu3d30d942008-01-31 19:48:27 +01001699 case RX_DROP_MONITOR:
Johannes Berg49461622008-06-30 15:10:45 +02001700 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1701 if (rx->sta)
1702 rx->sta->rx_dropped++;
1703 /* fall through */
1704 case RX_CONTINUE:
Michael Wu3d30d942008-01-31 19:48:27 +01001705 ieee80211_rx_cooked_monitor(rx);
1706 break;
1707 case RX_DROP_UNUSABLE:
Johannes Berg49461622008-06-30 15:10:45 +02001708 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1709 if (rx->sta)
1710 rx->sta->rx_dropped++;
Johannes Berg58905292008-01-31 19:48:25 +01001711 dev_kfree_skb(rx->skb);
1712 break;
Johannes Berg49461622008-06-30 15:10:45 +02001713 case RX_QUEUED:
1714 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1715 break;
Johannes Berg58905292008-01-31 19:48:25 +01001716 }
1717}
1718
Johannes Berg571ecf62007-07-27 15:43:22 +02001719/* main receive path */
1720
Johannes Berg23a24de2007-07-27 15:43:22 +02001721static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001722 u8 *bssid, struct ieee80211_rx_data *rx,
Johannes Berg23a24de2007-07-27 15:43:22 +02001723 struct ieee80211_hdr *hdr)
1724{
1725 int multicast = is_multicast_ether_addr(hdr->addr1);
1726
Johannes Berg51fb61e2007-12-19 01:31:27 +01001727 switch (sdata->vif.type) {
Johannes Berg23a24de2007-07-27 15:43:22 +02001728 case IEEE80211_IF_TYPE_STA:
1729 if (!bssid)
1730 return 0;
1731 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01001732 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02001733 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001734 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001735 } else if (!multicast &&
1736 compare_ether_addr(sdata->dev->dev_addr,
1737 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04001738 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02001739 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001740 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001741 }
1742 break;
1743 case IEEE80211_IF_TYPE_IBSS:
1744 if (!bssid)
1745 return 0;
Harvey Harrisona7767f92008-07-02 16:30:51 -07001746 if (ieee80211_is_beacon(hdr->frame_control)) {
Vladimir Koutny87291c02008-06-13 16:50:44 +02001747 if (!rx->sta)
1748 rx->sta = ieee80211_ibss_add_sta(sdata->dev,
1749 rx->skb, bssid, hdr->addr2,
1750 BIT(rx->status->rate_idx));
Bruno Randolf9d9bf772008-02-18 11:21:36 +09001751 return 1;
Vladimir Koutny87291c02008-06-13 16:50:44 +02001752 }
Bruno Randolf9d9bf772008-02-18 11:21:36 +09001753 else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01001754 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02001755 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001756 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001757 } else if (!multicast &&
1758 compare_ether_addr(sdata->dev->dev_addr,
1759 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04001760 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02001761 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001762 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001763 } else if (!rx->sta)
1764 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
Vladimir Koutny87291c02008-06-13 16:50:44 +02001765 bssid, hdr->addr2,
1766 BIT(rx->status->rate_idx));
Johannes Berg23a24de2007-07-27 15:43:22 +02001767 break;
Johannes Berg6032f932008-02-23 15:17:07 +01001768 case IEEE80211_IF_TYPE_MESH_POINT:
1769 if (!multicast &&
1770 compare_ether_addr(sdata->dev->dev_addr,
1771 hdr->addr1) != 0) {
1772 if (!(sdata->dev->flags & IFF_PROMISC))
1773 return 0;
1774
Johannes Berg5cf121c2008-02-25 16:27:43 +01001775 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg6032f932008-02-23 15:17:07 +01001776 }
1777 break;
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02001778 case IEEE80211_IF_TYPE_VLAN:
Johannes Berg23a24de2007-07-27 15:43:22 +02001779 case IEEE80211_IF_TYPE_AP:
1780 if (!bssid) {
1781 if (compare_ether_addr(sdata->dev->dev_addr,
1782 hdr->addr1))
1783 return 0;
1784 } else if (!ieee80211_bssid_match(bssid,
1785 sdata->dev->dev_addr)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01001786 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02001787 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001788 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001789 }
Johannes Berg23a24de2007-07-27 15:43:22 +02001790 break;
1791 case IEEE80211_IF_TYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07001792 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02001793 return 0;
1794 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1795 return 0;
1796 break;
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02001797 case IEEE80211_IF_TYPE_MNTR:
1798 /* take everything */
1799 break;
Johannes Berga2897552007-09-28 14:01:25 +02001800 case IEEE80211_IF_TYPE_INVALID:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02001801 /* should never get here */
1802 WARN_ON(1);
1803 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02001804 }
1805
1806 return 1;
1807}
1808
Johannes Berg571ecf62007-07-27 15:43:22 +02001809/*
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02001810 * This is the actual Rx frames handler. as it blongs to Rx path it must
1811 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02001812 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02001813static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
1814 struct sk_buff *skb,
1815 struct ieee80211_rx_status *status,
Johannes Berg8318d782008-01-24 19:38:38 +01001816 struct ieee80211_rate *rate)
Johannes Berg571ecf62007-07-27 15:43:22 +02001817{
1818 struct ieee80211_local *local = hw_to_local(hw);
1819 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02001820 struct ieee80211_hdr *hdr;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001821 struct ieee80211_rx_data rx;
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02001822 int prepares;
Johannes Berg8e6f0032007-07-27 15:43:22 +02001823 struct ieee80211_sub_if_data *prev = NULL;
1824 struct sk_buff *skb_new;
1825 u8 *bssid;
Johannes Berg571ecf62007-07-27 15:43:22 +02001826
Harvey Harrison358c8d92008-07-15 18:44:13 -07001827 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001828 memset(&rx, 0, sizeof(rx));
1829 rx.skb = skb;
1830 rx.local = local;
1831
Johannes Berg5cf121c2008-02-25 16:27:43 +01001832 rx.status = status;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001833 rx.rate = rate;
Johannes Bergb2e77712007-09-26 15:19:39 +02001834 rx.fc = le16_to_cpu(hdr->frame_control);
Johannes Berg72abd812007-09-17 01:29:22 -04001835
Harvey Harrison358c8d92008-07-15 18:44:13 -07001836 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
Johannes Berg571ecf62007-07-27 15:43:22 +02001837 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02001838
Johannes Berg8944b792008-01-31 19:48:26 +01001839 rx.sta = sta_info_get(local, hdr->addr2);
1840 if (rx.sta) {
Johannes Bergd0709a62008-02-25 16:27:46 +01001841 rx.sdata = rx.sta->sdata;
1842 rx.dev = rx.sta->sdata->dev;
Johannes Bergb2e77712007-09-26 15:19:39 +02001843 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001844
Johannes Berg571ecf62007-07-27 15:43:22 +02001845 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
Johannes Berg8944b792008-01-31 19:48:26 +01001846 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
Johannes Bergd0709a62008-02-25 16:27:46 +01001847 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02001848 }
1849
Zhu Yiece8edd2007-11-22 10:53:21 +08001850 if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
Johannes Berg5cf121c2008-02-25 16:27:43 +01001851 rx.flags |= IEEE80211_RX_IN_SCAN;
Johannes Berg571ecf62007-07-27 15:43:22 +02001852
Johannes Berg38f37142008-01-29 17:07:43 +01001853 ieee80211_parse_qos(&rx);
1854 ieee80211_verify_ip_alignment(&rx);
1855
Johannes Berg571ecf62007-07-27 15:43:22 +02001856 skb = rx.skb;
1857
Johannes Berg79010422007-09-18 17:29:21 -04001858 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg2a8a9a82007-08-28 17:01:52 -04001859 if (!netif_running(sdata->dev))
1860 continue;
1861
Johannes Berg51fb61e2007-12-19 01:31:27 +01001862 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR)
Johannes Bergb2e77712007-09-26 15:19:39 +02001863 continue;
1864
Johannes Berg51fb61e2007-12-19 01:31:27 +01001865 bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
Johannes Berg5cf121c2008-02-25 16:27:43 +01001866 rx.flags |= IEEE80211_RX_RA_MATCH;
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02001867 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
Johannes Berg23a24de2007-07-27 15:43:22 +02001868
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02001869 if (!prepares)
Johannes Berg23a24de2007-07-27 15:43:22 +02001870 continue;
Johannes Berg8e6f0032007-07-27 15:43:22 +02001871
Johannes Berg340e11f2007-07-27 15:43:22 +02001872 /*
1873 * frame is destined for this interface, but if it's not
1874 * also for the previous one we handle that after the
1875 * loop to avoid copying the SKB once too much
1876 */
1877
1878 if (!prev) {
1879 prev = sdata;
1880 continue;
Johannes Berg8e6f0032007-07-27 15:43:22 +02001881 }
Johannes Berg340e11f2007-07-27 15:43:22 +02001882
1883 /*
1884 * frame was destined for the previous interface
1885 * so invoke RX handlers for it
1886 */
1887
1888 skb_new = skb_copy(skb, GFP_ATOMIC);
1889 if (!skb_new) {
1890 if (net_ratelimit())
1891 printk(KERN_DEBUG "%s: failed to copy "
Pavel Roskina4278e12008-05-12 09:02:24 -04001892 "multicast frame for %s\n",
Johannes Bergdd1cd4c2007-09-18 17:29:20 -04001893 wiphy_name(local->hw.wiphy),
1894 prev->dev->name);
Johannes Berg340e11f2007-07-27 15:43:22 +02001895 continue;
1896 }
Helmut Schaa69f817b2007-12-21 15:16:35 +01001897 rx.fc = le16_to_cpu(hdr->frame_control);
Johannes Berg8944b792008-01-31 19:48:26 +01001898 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
Johannes Berg8e6f0032007-07-27 15:43:22 +02001899 prev = sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02001900 }
Johannes Berg8e6f0032007-07-27 15:43:22 +02001901 if (prev) {
Helmut Schaa69f817b2007-12-21 15:16:35 +01001902 rx.fc = le16_to_cpu(hdr->frame_control);
Johannes Berg8944b792008-01-31 19:48:26 +01001903 ieee80211_invoke_rx_handlers(prev, &rx, skb);
Johannes Berg8e6f0032007-07-27 15:43:22 +02001904 } else
1905 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001906}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02001907
Ron Rindjunskyb5807812007-12-25 17:00:35 +02001908#define SEQ_MODULO 0x1000
1909#define SEQ_MASK 0xfff
1910
1911static inline int seq_less(u16 sq1, u16 sq2)
1912{
1913 return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1));
1914}
1915
1916static inline u16 seq_inc(u16 sq)
1917{
1918 return ((sq + 1) & SEQ_MASK);
1919}
1920
1921static inline u16 seq_sub(u16 sq1, u16 sq2)
1922{
1923 return ((sq1 - sq2) & SEQ_MASK);
1924}
1925
1926
Ron Rindjunsky71364712007-12-25 17:00:36 +02001927/*
1928 * As it function blongs to Rx path it must be called with
1929 * the proper rcu_read_lock protection for its flow.
1930 */
Ron Rindjunskyb5807812007-12-25 17:00:35 +02001931u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
1932 struct tid_ampdu_rx *tid_agg_rx,
1933 struct sk_buff *skb, u16 mpdu_seq_num,
1934 int bar_req)
1935{
1936 struct ieee80211_local *local = hw_to_local(hw);
1937 struct ieee80211_rx_status status;
1938 u16 head_seq_num, buf_size;
1939 int index;
Johannes Berg8318d782008-01-24 19:38:38 +01001940 struct ieee80211_supported_band *sband;
1941 struct ieee80211_rate *rate;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02001942
1943 buf_size = tid_agg_rx->buf_size;
1944 head_seq_num = tid_agg_rx->head_seq_num;
1945
1946 /* frame with out of date sequence number */
1947 if (seq_less(mpdu_seq_num, head_seq_num)) {
1948 dev_kfree_skb(skb);
1949 return 1;
1950 }
1951
1952 /* if frame sequence number exceeds our buffering window size or
1953 * block Ack Request arrived - release stored frames */
1954 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
1955 /* new head to the ordering buffer */
1956 if (bar_req)
1957 head_seq_num = mpdu_seq_num;
1958 else
1959 head_seq_num =
1960 seq_inc(seq_sub(mpdu_seq_num, buf_size));
1961 /* release stored frames up to new head to stack */
1962 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1963 index = seq_sub(tid_agg_rx->head_seq_num,
1964 tid_agg_rx->ssn)
1965 % tid_agg_rx->buf_size;
1966
1967 if (tid_agg_rx->reorder_buf[index]) {
1968 /* release the reordered frames to stack */
1969 memcpy(&status,
1970 tid_agg_rx->reorder_buf[index]->cb,
1971 sizeof(status));
Johannes Berg8318d782008-01-24 19:38:38 +01001972 sband = local->hw.wiphy->bands[status.band];
1973 rate = &sband->bitrates[status.rate_idx];
Ron Rindjunskyb5807812007-12-25 17:00:35 +02001974 __ieee80211_rx_handle_packet(hw,
1975 tid_agg_rx->reorder_buf[index],
Johannes Berg9e72ebd2008-05-21 17:33:42 +02001976 &status, rate);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02001977 tid_agg_rx->stored_mpdu_num--;
1978 tid_agg_rx->reorder_buf[index] = NULL;
1979 }
1980 tid_agg_rx->head_seq_num =
1981 seq_inc(tid_agg_rx->head_seq_num);
1982 }
1983 if (bar_req)
1984 return 1;
1985 }
1986
1987 /* now the new frame is always in the range of the reordering */
1988 /* buffer window */
1989 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
1990 % tid_agg_rx->buf_size;
1991 /* check if we already stored this frame */
1992 if (tid_agg_rx->reorder_buf[index]) {
1993 dev_kfree_skb(skb);
1994 return 1;
1995 }
1996
1997 /* if arrived mpdu is in the right order and nothing else stored */
1998 /* release it immediately */
1999 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2000 tid_agg_rx->stored_mpdu_num == 0) {
2001 tid_agg_rx->head_seq_num =
2002 seq_inc(tid_agg_rx->head_seq_num);
2003 return 0;
2004 }
2005
2006 /* put the frame in the reordering buffer */
2007 tid_agg_rx->reorder_buf[index] = skb;
2008 tid_agg_rx->stored_mpdu_num++;
2009 /* release the buffer until next missing frame */
2010 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2011 % tid_agg_rx->buf_size;
2012 while (tid_agg_rx->reorder_buf[index]) {
2013 /* release the reordered frame back to stack */
2014 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2015 sizeof(status));
Johannes Berg8318d782008-01-24 19:38:38 +01002016 sband = local->hw.wiphy->bands[status.band];
2017 rate = &sband->bitrates[status.rate_idx];
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002018 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
Johannes Berg9e72ebd2008-05-21 17:33:42 +02002019 &status, rate);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002020 tid_agg_rx->stored_mpdu_num--;
2021 tid_agg_rx->reorder_buf[index] = NULL;
2022 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2023 index = seq_sub(tid_agg_rx->head_seq_num,
2024 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2025 }
2026 return 1;
2027}
2028
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002029static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2030 struct sk_buff *skb)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002031{
2032 struct ieee80211_hw *hw = &local->hw;
2033 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2034 struct sta_info *sta;
2035 struct tid_ampdu_rx *tid_agg_rx;
Harvey Harrison87228f52008-06-11 14:21:59 -07002036 u16 sc;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002037 u16 mpdu_seq_num;
Harvey Harrison182503a2008-06-22 16:45:29 -07002038 u8 ret = 0;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002039 int tid;
2040
2041 sta = sta_info_get(local, hdr->addr2);
2042 if (!sta)
2043 return ret;
2044
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002045 /* filter the QoS data rx stream according to
2046 * STA/TID and check if this STA/TID is on aggregation */
Harvey Harrison87228f52008-06-11 14:21:59 -07002047 if (!ieee80211_is_data_qos(hdr->frame_control))
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002048 goto end_reorder;
2049
Harvey Harrison238f74a2008-07-02 11:05:34 -07002050 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002051
Ron Rindjunskycee24a32008-03-26 20:36:03 +02002052 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002053 goto end_reorder;
2054
Ron Rindjunskycee24a32008-03-26 20:36:03 +02002055 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2056
Emmanuel Grumbach2560b6e2008-07-10 00:47:19 +03002057 /* qos null data frames are excluded */
2058 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002059 goto end_reorder;
2060
2061 /* new un-ordered ampdu frame - process it */
2062
2063 /* reset session timer */
2064 if (tid_agg_rx->timeout) {
2065 unsigned long expires =
2066 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
2067 mod_timer(&tid_agg_rx->session_timer, expires);
2068 }
2069
2070 /* if this mpdu is fragmented - terminate rx aggregation session */
2071 sc = le16_to_cpu(hdr->seq_ctrl);
2072 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Bergd0709a62008-02-25 16:27:46 +01002073 ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr,
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002074 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2075 ret = 1;
2076 goto end_reorder;
2077 }
2078
2079 /* according to mpdu sequence number deal with reordering buffer */
2080 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2081 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2082 mpdu_seq_num, 0);
Johannes Bergd0709a62008-02-25 16:27:46 +01002083 end_reorder:
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002084 return ret;
2085}
2086
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002087/*
2088 * This is the receive path handler. It is called by a low level driver when an
2089 * 802.11 MPDU is received from the hardware.
2090 */
2091void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2092 struct ieee80211_rx_status *status)
2093{
2094 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01002095 struct ieee80211_rate *rate = NULL;
2096 struct ieee80211_supported_band *sband;
2097
2098 if (status->band < 0 ||
Adrian Bunk13d8fd22008-04-23 12:51:28 +03002099 status->band >= IEEE80211_NUM_BANDS) {
Johannes Berg8318d782008-01-24 19:38:38 +01002100 WARN_ON(1);
2101 return;
2102 }
2103
2104 sband = local->hw.wiphy->bands[status->band];
2105
2106 if (!sband ||
2107 status->rate_idx < 0 ||
2108 status->rate_idx >= sband->n_bitrates) {
2109 WARN_ON(1);
2110 return;
2111 }
2112
2113 rate = &sband->bitrates[status->rate_idx];
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002114
2115 /*
2116 * key references and virtual interfaces are protected using RCU
2117 * and this requires that we are in a read-side RCU section during
2118 * receive processing
2119 */
2120 rcu_read_lock();
2121
2122 /*
2123 * Frames with failed FCS/PLCP checksum are not returned,
2124 * all other frames are returned without radiotap header
2125 * if it was previously present.
2126 * Also, frames with less than 16 bytes are dropped.
2127 */
Johannes Berg8318d782008-01-24 19:38:38 +01002128 skb = ieee80211_rx_monitor(local, skb, status, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002129 if (!skb) {
2130 rcu_read_unlock();
2131 return;
2132 }
2133
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002134 if (!ieee80211_rx_reorder_ampdu(local, skb))
Johannes Berg9e72ebd2008-05-21 17:33:42 +02002135 __ieee80211_rx_handle_packet(hw, skb, status, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002136
2137 rcu_read_unlock();
2138}
Johannes Berg571ecf62007-07-27 15:43:22 +02002139EXPORT_SYMBOL(__ieee80211_rx);
2140
2141/* This is a version of the rx handler that can be called from hard irq
2142 * context. Post the skb on the queue and schedule the tasklet */
2143void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2144 struct ieee80211_rx_status *status)
2145{
2146 struct ieee80211_local *local = hw_to_local(hw);
2147
2148 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2149
2150 skb->dev = local->mdev;
2151 /* copy status into skb->cb for use by tasklet */
2152 memcpy(skb->cb, status, sizeof(*status));
2153 skb->pkt_type = IEEE80211_RX_MSG;
2154 skb_queue_tail(&local->skb_queue, skb);
2155 tasklet_schedule(&local->tasklet);
2156}
2157EXPORT_SYMBOL(ieee80211_rx_irqsafe);