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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;
146 pos++;
147
148 /* IEEE80211_RADIOTAP_RATE */
149 *pos = rate->bitrate / 5;
150 pos++;
151
152 /* IEEE80211_RADIOTAP_CHANNEL */
153 *(__le16 *)pos = cpu_to_le16(status->freq);
154 pos += 2;
155 if (status->band == IEEE80211_BAND_5GHZ)
156 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
157 IEEE80211_CHAN_5GHZ);
158 else
159 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_DYN |
160 IEEE80211_CHAN_2GHZ);
161 pos += 2;
162
163 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
164 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
165 *pos = status->signal;
166 rthdr->it_present |=
167 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
168 pos++;
169 }
170
171 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
172 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
173 *pos = status->noise;
174 rthdr->it_present |=
175 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
176 pos++;
177 }
178
179 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
180
181 /* IEEE80211_RADIOTAP_ANTENNA */
182 *pos = status->antenna;
183 pos++;
184
185 /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */
186 if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) {
187 *pos = status->signal;
188 rthdr->it_present |=
189 cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL);
190 pos++;
191 }
192
193 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
194
195 /* IEEE80211_RADIOTAP_RX_FLAGS */
196 /* ensure 2 byte alignment for the 2 byte field as required */
197 if ((pos - (unsigned char *)rthdr) & 1)
198 pos++;
199 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
200 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
201 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
202 pos += 2;
203}
204
Johannes Bergb2e77712007-09-26 15:19:39 +0200205/*
206 * This function copies a received frame to all monitor interfaces and
207 * returns a cleaned-up SKB that no longer includes the FCS nor the
208 * radiotap header the driver might have added.
209 */
210static struct sk_buff *
211ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
Johannes Berg8318d782008-01-24 19:38:38 +0100212 struct ieee80211_rx_status *status,
213 struct ieee80211_rate *rate)
Johannes Bergb2e77712007-09-26 15:19:39 +0200214{
215 struct ieee80211_sub_if_data *sdata;
Johannes Bergb2e77712007-09-26 15:19:39 +0200216 int needed_headroom = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200217 struct sk_buff *skb, *skb2;
218 struct net_device *prev_dev = NULL;
219 int present_fcs_len = 0;
220 int rtap_len = 0;
221
222 /*
223 * First, we may need to make a copy of the skb because
224 * (1) we need to modify it for radiotap (if not present), and
225 * (2) the other RX handlers will modify the skb we got.
226 *
227 * We don't need to, of course, if we aren't going to return
228 * the SKB because it has a bad FCS/PLCP checksum.
229 */
230 if (status->flag & RX_FLAG_RADIOTAP)
231 rtap_len = ieee80211_get_radiotap_len(origskb->data);
232 else
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200233 /* room for the radiotap header based on driver features */
234 needed_headroom = ieee80211_rx_radiotap_len(local, status);
Johannes Bergb2e77712007-09-26 15:19:39 +0200235
236 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
237 present_fcs_len = FCS_LEN;
238
239 if (!local->monitors) {
240 if (should_drop_frame(status, origskb, present_fcs_len,
241 rtap_len)) {
242 dev_kfree_skb(origskb);
243 return NULL;
244 }
245
246 return remove_monitor_info(local, origskb, rtap_len);
247 }
248
249 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
250 /* only need to expand headroom if necessary */
251 skb = origskb;
252 origskb = NULL;
253
254 /*
255 * This shouldn't trigger often because most devices have an
256 * RX header they pull before we get here, and that should
257 * be big enough for our radiotap information. We should
258 * probably export the length to drivers so that we can have
259 * them allocate enough headroom to start with.
260 */
261 if (skb_headroom(skb) < needed_headroom &&
Johannes Bergc49e5ea2007-12-11 21:33:42 +0100262 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200263 dev_kfree_skb(skb);
264 return NULL;
265 }
266 } else {
267 /*
268 * Need to make a copy and possibly remove radiotap header
269 * and FCS from the original.
270 */
271 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
272
273 origskb = remove_monitor_info(local, origskb, rtap_len);
274
275 if (!skb)
276 return origskb;
277 }
278
279 /* if necessary, prepend radiotap information */
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200280 if (!(status->flag & RX_FLAG_RADIOTAP))
281 ieee80211_add_rx_radiotap_header(local, skb, status, rate,
282 needed_headroom);
Johannes Bergb2e77712007-09-26 15:19:39 +0200283
Johannes Bergce3edf6d02007-12-19 01:31:22 +0100284 skb_reset_mac_header(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200285 skb->ip_summed = CHECKSUM_UNNECESSARY;
286 skb->pkt_type = PACKET_OTHERHOST;
287 skb->protocol = htons(ETH_P_802_2);
288
289 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
290 if (!netif_running(sdata->dev))
291 continue;
292
Johannes Berg51fb61e2007-12-19 01:31:27 +0100293 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR)
Johannes Bergb2e77712007-09-26 15:19:39 +0200294 continue;
295
Michael Wu3d30d942008-01-31 19:48:27 +0100296 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
297 continue;
298
Johannes Bergb2e77712007-09-26 15:19:39 +0200299 if (prev_dev) {
300 skb2 = skb_clone(skb, GFP_ATOMIC);
301 if (skb2) {
302 skb2->dev = prev_dev;
303 netif_rx(skb2);
304 }
305 }
306
307 prev_dev = sdata->dev;
308 sdata->dev->stats.rx_packets++;
309 sdata->dev->stats.rx_bytes += skb->len;
310 }
311
312 if (prev_dev) {
313 skb->dev = prev_dev;
314 netif_rx(skb);
315 } else
316 dev_kfree_skb(skb);
317
318 return origskb;
319}
320
321
Johannes Berg5cf121c2008-02-25 16:27:43 +0100322static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200323{
Harvey Harrison238f74a2008-07-02 11:05:34 -0700324 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200325 int tid;
326
327 /* does the frame have a qos control field? */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700328 if (ieee80211_is_data_qos(hdr->frame_control)) {
329 u8 *qc = ieee80211_get_qos_ctl(hdr);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200330 /* frame has qos control */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700331 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
332 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
Johannes Berg5cf121c2008-02-25 16:27:43 +0100333 rx->flags |= IEEE80211_RX_AMSDU;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +0200334 else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100335 rx->flags &= ~IEEE80211_RX_AMSDU;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200336 } else {
Harvey Harrison238f74a2008-07-02 11:05:34 -0700337 if (unlikely(ieee80211_is_mgmt(hdr->frame_control))) {
Johannes Berg6e0d1142007-07-27 15:43:22 +0200338 /* Separate TID for management frames */
339 tid = NUM_RX_DATA_QUEUES - 1;
340 } else {
341 /* no qos control present */
342 tid = 0; /* 802.1d - Best Effort */
343 }
344 }
Johannes Berg52865df2007-07-27 15:43:22 +0200345
Johannes Berg5cf121c2008-02-25 16:27:43 +0100346 rx->queue = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200347 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
348 * For now, set skb->priority to 0 for other cases. */
349 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100350}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200351
Johannes Berg5cf121c2008-02-25 16:27:43 +0100352static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx)
Johannes Berg38f37142008-01-29 17:07:43 +0100353{
354#ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
355 int hdrlen;
356
357 if (!WLAN_FC_DATA_PRESENT(rx->fc))
358 return;
359
360 /*
361 * Drivers are required to align the payload data in a way that
362 * guarantees that the contained IP header is aligned to a four-
363 * byte boundary. In the case of regular frames, this simply means
364 * aligning the payload to a four-byte boundary (because either
365 * the IP header is directly contained, or IV/RFC1042 headers that
366 * have a length divisible by four are in front of it.
367 *
368 * With A-MSDU frames, however, the payload data address must
369 * yield two modulo four because there are 14-byte 802.3 headers
370 * within the A-MSDU frames that push the IP header further back
371 * to a multiple of four again. Thankfully, the specs were sane
372 * enough this time around to require padding each A-MSDU subframe
373 * to a length that is a multiple of four.
374 *
375 * Padding like atheros hardware adds which is inbetween the 802.11
376 * header and the payload is not supported, the driver is required
377 * to move the 802.11 header further back in that case.
378 */
379 hdrlen = ieee80211_get_hdrlen(rx->fc);
Johannes Berg5cf121c2008-02-25 16:27:43 +0100380 if (rx->flags & IEEE80211_RX_AMSDU)
Johannes Berg38f37142008-01-29 17:07:43 +0100381 hdrlen += ETH_HLEN;
382 WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
383#endif
Johannes Berg6e0d1142007-07-27 15:43:22 +0200384}
385
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +0200386
Johannes Berg571ecf62007-07-27 15:43:22 +0200387/* rx handlers */
388
Johannes Berg49461622008-06-30 15:10:45 +0200389static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100390ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200391{
392 struct ieee80211_local *local = rx->local;
393 struct sk_buff *skb = rx->skb;
394
Zhu Yiece8edd2007-11-22 10:53:21 +0800395 if (unlikely(local->sta_hw_scanning))
Johannes Berg5cf121c2008-02-25 16:27:43 +0100396 return ieee80211_sta_rx_scan(rx->dev, skb, rx->status);
Zhu Yiece8edd2007-11-22 10:53:21 +0800397
398 if (unlikely(local->sta_sw_scanning)) {
399 /* drop all the other packets during a software scan anyway */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100400 if (ieee80211_sta_rx_scan(rx->dev, skb, rx->status)
Johannes Berg9ae54c82008-01-31 19:48:20 +0100401 != RX_QUEUED)
Zhu Yiece8edd2007-11-22 10:53:21 +0800402 dev_kfree_skb(skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100403 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200404 }
405
Johannes Berg5cf121c2008-02-25 16:27:43 +0100406 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200407 /* scanning finished during invoking of handlers */
408 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100409 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200410 }
411
Johannes Berg9ae54c82008-01-31 19:48:20 +0100412 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200413}
414
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100415static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100416ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100417{
418 int hdrlen = ieee80211_get_hdrlen(rx->fc);
419 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100420
421#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
422
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100423 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) {
424 if (!((rx->fc & IEEE80211_FCTL_FROMDS) &&
425 (rx->fc & IEEE80211_FCTL_TODS)))
426 return RX_DROP_MONITOR;
427 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
428 return RX_DROP_MONITOR;
429 }
430
431 /* If there is not an established peer link and this is not a peer link
432 * establisment frame, beacon or probe, drop the frame.
433 */
434
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800435 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100436 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100437
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100438 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT)
439 return RX_DROP_MONITOR;
440
441 switch (rx->fc & IEEE80211_FCTL_STYPE) {
442 case IEEE80211_STYPE_ACTION:
443 mgmt = (struct ieee80211_mgmt *)hdr;
444 if (mgmt->u.action.category != PLINK_CATEGORY)
445 return RX_DROP_MONITOR;
446 /* fall through on else */
447 case IEEE80211_STYPE_PROBE_REQ:
448 case IEEE80211_STYPE_PROBE_RESP:
449 case IEEE80211_STYPE_BEACON:
450 return RX_CONTINUE;
451 break;
452 default:
453 return RX_DROP_MONITOR;
454 }
455
456 } else if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
Luis Carlos Cobo966a5422008-03-31 15:33:39 -0700457 is_multicast_ether_addr(hdr->addr1) &&
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100458 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->dev))
459 return RX_DROP_MONITOR;
Johannes Berg902acc72008-02-23 15:17:19 +0100460#undef msh_h_get
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100461
Johannes Berg902acc72008-02-23 15:17:19 +0100462 return RX_CONTINUE;
463}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100464
465
Johannes Berg49461622008-06-30 15:10:45 +0200466static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100467ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200468{
469 struct ieee80211_hdr *hdr;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100470
Johannes Berg571ecf62007-07-27 15:43:22 +0200471 hdr = (struct ieee80211_hdr *) rx->skb->data;
472
473 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
474 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
475 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100476 rx->sta->last_seq_ctrl[rx->queue] ==
Johannes Berg571ecf62007-07-27 15:43:22 +0200477 hdr->seq_ctrl)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +0100478 if (rx->flags & IEEE80211_RX_RA_MATCH) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200479 rx->local->dot11FrameDuplicateCount++;
480 rx->sta->num_duplicates++;
481 }
Johannes Berge4c26ad2008-01-31 19:48:21 +0100482 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200483 } else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100484 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +0200485 }
486
Johannes Berg571ecf62007-07-27 15:43:22 +0200487 if (unlikely(rx->skb->len < 16)) {
488 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100489 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200490 }
491
Johannes Berg571ecf62007-07-27 15:43:22 +0200492 /* Drop disallowed frame classes based on STA auth/assoc state;
493 * IEEE 802.11, Chap 5.5.
494 *
495 * 80211.o does filtering only based on association state, i.e., it
496 * drops Class 3 frames from not associated stations. hostapd sends
497 * deauth/disassoc frames when needed. In addition, hostapd is
498 * responsible for filtering on both auth and assoc states.
499 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100500
Johannes Berg902acc72008-02-23 15:17:19 +0100501 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100502 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100503
Johannes Berg571ecf62007-07-27 15:43:22 +0200504 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
505 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
506 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
Johannes Berg51fb61e2007-12-19 01:31:27 +0100507 rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
Johannes Berg07346f812008-05-03 01:02:02 +0200508 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200509 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
510 !(rx->fc & IEEE80211_FCTL_TODS) &&
511 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
Johannes Berg5cf121c2008-02-25 16:27:43 +0100512 || !(rx->flags & IEEE80211_RX_RA_MATCH)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200513 /* Drop IBSS frames and frames for other hosts
514 * silently. */
Johannes Berge4c26ad2008-01-31 19:48:21 +0100515 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200516 }
517
Johannes Berge4c26ad2008-01-31 19:48:21 +0100518 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200519 }
520
Johannes Berg9ae54c82008-01-31 19:48:20 +0100521 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +0200522}
523
524
Johannes Berg49461622008-06-30 15:10:45 +0200525static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100526ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
Johannes Berg570bd532007-07-27 15:43:22 +0200527{
528 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
Johannes Berg3017b802007-08-28 17:01:53 -0400529 int keyidx;
530 int hdrlen;
Johannes Berge4c26ad2008-01-31 19:48:21 +0100531 ieee80211_rx_result result = RX_DROP_UNUSABLE;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400532 struct ieee80211_key *stakey = NULL;
Johannes Berg570bd532007-07-27 15:43:22 +0200533
Johannes Berg3017b802007-08-28 17:01:53 -0400534 /*
535 * Key selection 101
536 *
537 * There are three types of keys:
538 * - GTK (group keys)
539 * - PTK (pairwise keys)
540 * - STK (station-to-station pairwise keys)
541 *
542 * When selecting a key, we have to distinguish between multicast
543 * (including broadcast) and unicast frames, the latter can only
544 * use PTKs and STKs while the former always use GTKs. Unless, of
545 * course, actual WEP keys ("pre-RSNA") are used, then unicast
546 * frames can also use key indizes like GTKs. Hence, if we don't
547 * have a PTK/STK we check the key index for a WEP key.
548 *
Johannes Berg8dc06a12007-08-28 17:01:55 -0400549 * Note that in a regular BSS, multicast frames are sent by the
550 * AP only, associated stations unicast the frame to the AP first
551 * which then multicasts it on their behalf.
552 *
Johannes Berg3017b802007-08-28 17:01:53 -0400553 * There is also a slight problem in IBSS mode: GTKs are negotiated
554 * with each station, that is something we don't currently handle.
Johannes Berg8dc06a12007-08-28 17:01:55 -0400555 * The spec seems to expect that one negotiates the same key with
556 * every station but there's no such requirement; VLANs could be
557 * possible.
Johannes Berg3017b802007-08-28 17:01:53 -0400558 */
Johannes Berg571ecf62007-07-27 15:43:22 +0200559
Johannes Berg3017b802007-08-28 17:01:53 -0400560 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100561 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -0400562
563 /*
Johannes Berg1990af82007-09-26 17:53:15 +0200564 * No point in finding a key and decrypting if the frame is neither
Johannes Berg3017b802007-08-28 17:01:53 -0400565 * addressed to us nor a multicast frame.
566 */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100567 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100568 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -0400569
Johannes Bergd4e46a32007-09-14 11:10:24 -0400570 if (rx->sta)
571 stakey = rcu_dereference(rx->sta->key);
572
573 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
574 rx->key = stakey;
Johannes Berg571ecf62007-07-27 15:43:22 +0200575 } else {
Johannes Berg3017b802007-08-28 17:01:53 -0400576 /*
577 * The device doesn't give us the IV so we won't be
578 * able to look up the key. That's ok though, we
579 * don't need to decrypt the frame, we just won't
580 * be able to keep statistics accurate.
581 * Except for key threshold notifications, should
582 * we somehow allow the driver to tell us which key
583 * the hardware used if this flag is set?
584 */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100585 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
586 (rx->status->flag & RX_FLAG_IV_STRIPPED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100587 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200588
Johannes Berg3017b802007-08-28 17:01:53 -0400589 hdrlen = ieee80211_get_hdrlen(rx->fc);
Johannes Berg571ecf62007-07-27 15:43:22 +0200590
Johannes Berg3017b802007-08-28 17:01:53 -0400591 if (rx->skb->len < 8 + hdrlen)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100592 return RX_DROP_UNUSABLE; /* TODO: count this? */
Johannes Berg571ecf62007-07-27 15:43:22 +0200593
Johannes Berg3017b802007-08-28 17:01:53 -0400594 /*
595 * no need to call ieee80211_wep_get_keyidx,
596 * it verifies a bunch of things we've done already
597 */
598 keyidx = rx->skb->data[hdrlen + 3] >> 6;
599
Johannes Bergd4e46a32007-09-14 11:10:24 -0400600 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
Johannes Berg3017b802007-08-28 17:01:53 -0400601
602 /*
603 * RSNA-protected unicast frames should always be sent with
604 * pairwise or station-to-station keys, but for WEP we allow
605 * using a key index as well.
606 */
Johannes Berg8f20fc22007-08-28 17:01:54 -0400607 if (rx->key && rx->key->conf.alg != ALG_WEP &&
Johannes Berg3017b802007-08-28 17:01:53 -0400608 !is_multicast_ether_addr(hdr->addr1))
609 rx->key = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +0200610 }
611
Johannes Berg3017b802007-08-28 17:01:53 -0400612 if (rx->key) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200613 rx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -0400614 /* TODO: add threshold stuff again */
Johannes Berg1990af82007-09-26 17:53:15 +0200615 } else {
Johannes Berge4c26ad2008-01-31 19:48:21 +0100616 return RX_DROP_MONITOR;
Johannes Berg70f08762007-09-26 17:53:14 +0200617 }
618
Johannes Berg1990af82007-09-26 17:53:15 +0200619 /* Check for weak IVs if possible */
620 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
621 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100622 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
623 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
Johannes Berg1990af82007-09-26 17:53:15 +0200624 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
625 rx->sta->wep_weak_iv_count++;
626
Johannes Berg70f08762007-09-26 17:53:14 +0200627 switch (rx->key->conf.alg) {
628 case ALG_WEP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200629 result = ieee80211_crypto_wep_decrypt(rx);
630 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200631 case ALG_TKIP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200632 result = ieee80211_crypto_tkip_decrypt(rx);
633 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200634 case ALG_CCMP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200635 result = ieee80211_crypto_ccmp_decrypt(rx);
636 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200637 }
638
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200639 /* either the frame has been decrypted or will be dropped */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100640 rx->status->flag |= RX_FLAG_DECRYPTED;
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200641
642 return result;
Johannes Berg70f08762007-09-26 17:53:14 +0200643}
644
Johannes Berg571ecf62007-07-27 15:43:22 +0200645static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
646{
647 struct ieee80211_sub_if_data *sdata;
Joe Perches0795af52007-10-03 17:59:30 -0700648 DECLARE_MAC_BUF(mac);
649
Johannes Bergd0709a62008-02-25 16:27:46 +0100650 sdata = sta->sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +0200651
652 if (sdata->bss)
653 atomic_inc(&sdata->bss->num_sta_ps);
Johannes Berg07346f812008-05-03 01:02:02 +0200654 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
Johannes Berg571ecf62007-07-27 15:43:22 +0200655#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700656 printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
657 dev->name, print_mac(mac, sta->addr), sta->aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200658#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
659}
660
661static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
662{
663 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
664 struct sk_buff *skb;
665 int sent = 0;
666 struct ieee80211_sub_if_data *sdata;
Johannes Berge039fa42008-05-15 12:55:29 +0200667 struct ieee80211_tx_info *info;
Joe Perches0795af52007-10-03 17:59:30 -0700668 DECLARE_MAC_BUF(mac);
Johannes Berg571ecf62007-07-27 15:43:22 +0200669
Johannes Bergd0709a62008-02-25 16:27:46 +0100670 sdata = sta->sdata;
Johannes Berg004c8722008-02-20 11:21:35 +0100671
Johannes Berg571ecf62007-07-27 15:43:22 +0200672 if (sdata->bss)
673 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg004c8722008-02-20 11:21:35 +0100674
Johannes Berg07346f812008-05-03 01:02:02 +0200675 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
Johannes Berg004c8722008-02-20 11:21:35 +0100676
677 if (!skb_queue_empty(&sta->ps_tx_buf))
678 sta_info_clear_tim_bit(sta);
679
Johannes Berg571ecf62007-07-27 15:43:22 +0200680#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700681 printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
682 dev->name, print_mac(mac, sta->addr), sta->aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200683#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg004c8722008-02-20 11:21:35 +0100684
Johannes Berg571ecf62007-07-27 15:43:22 +0200685 /* Send all buffered frames to the station */
686 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
Johannes Berge039fa42008-05-15 12:55:29 +0200687 info = IEEE80211_SKB_CB(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200688 sent++;
Johannes Berge039fa42008-05-15 12:55:29 +0200689 info->flags |= IEEE80211_TX_CTL_REQUEUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200690 dev_queue_xmit(skb);
691 }
692 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
Johannes Berge039fa42008-05-15 12:55:29 +0200693 info = IEEE80211_SKB_CB(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200694 local->total_ps_buffered--;
695 sent++;
696#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700697 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
Johannes Berg571ecf62007-07-27 15:43:22 +0200698 "since STA not sleeping anymore\n", dev->name,
Joe Perches0795af52007-10-03 17:59:30 -0700699 print_mac(mac, sta->addr), sta->aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200700#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berge039fa42008-05-15 12:55:29 +0200701 info->flags |= IEEE80211_TX_CTL_REQUEUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200702 dev_queue_xmit(skb);
703 }
704
705 return sent;
706}
707
Johannes Berg49461622008-06-30 15:10:45 +0200708static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100709ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200710{
711 struct sta_info *sta = rx->sta;
712 struct net_device *dev = rx->dev;
713 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
714
715 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +0100716 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200717
718 /* Update last_rx only for IBSS packets which are for the current
719 * BSSID to avoid keeping the current IBSS network alive in cases where
720 * other STAs are using different BSSID. */
Johannes Berg51fb61e2007-12-19 01:31:27 +0100721 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
Ron Rindjunsky71364712007-12-25 17:00:36 +0200722 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
723 IEEE80211_IF_TYPE_IBSS);
Johannes Berg571ecf62007-07-27 15:43:22 +0200724 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
725 sta->last_rx = jiffies;
726 } else
727 if (!is_multicast_ether_addr(hdr->addr1) ||
Johannes Berg51fb61e2007-12-19 01:31:27 +0100728 rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200729 /* Update last_rx only for unicast frames in order to prevent
730 * the Probe Request frames (the only broadcast frames from a
731 * STA in infrastructure mode) from keeping a connection alive.
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100732 * Mesh beacons will update last_rx when if they are found to
733 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +0200734 */
735 sta->last_rx = jiffies;
736 }
737
Johannes Berg5cf121c2008-02-25 16:27:43 +0100738 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100739 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200740
741 sta->rx_fragments++;
742 sta->rx_bytes += rx->skb->len;
Johannes Berg5cf121c2008-02-25 16:27:43 +0100743 sta->last_signal = rx->status->signal;
Bruno Randolf566bfe52008-05-08 19:15:40 +0200744 sta->last_qual = rx->status->qual;
Johannes Berg5cf121c2008-02-25 16:27:43 +0100745 sta->last_noise = rx->status->noise;
Johannes Berg571ecf62007-07-27 15:43:22 +0200746
747 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
748 /* Change STA power saving mode only in the end of a frame
749 * exchange sequence */
Johannes Berg07346f812008-05-03 01:02:02 +0200750 if (test_sta_flags(sta, WLAN_STA_PS) &&
751 !(rx->fc & IEEE80211_FCTL_PM))
Johannes Berg5cf121c2008-02-25 16:27:43 +0100752 rx->sent_ps_buffered += ap_sta_ps_end(dev, sta);
Johannes Berg07346f812008-05-03 01:02:02 +0200753 else if (!test_sta_flags(sta, WLAN_STA_PS) &&
Johannes Berg571ecf62007-07-27 15:43:22 +0200754 (rx->fc & IEEE80211_FCTL_PM))
755 ap_sta_ps_start(dev, sta);
756 }
757
758 /* Drop data::nullfunc frames silently, since they are used only to
759 * control station power saving mode. */
760 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
761 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
762 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
763 /* Update counter and free packet here to avoid counting this
764 * as a dropped packed. */
765 sta->rx_packets++;
766 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100767 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200768 }
769
Johannes Berg9ae54c82008-01-31 19:48:20 +0100770 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200771} /* ieee80211_rx_h_sta_process */
772
Johannes Berg571ecf62007-07-27 15:43:22 +0200773static inline struct ieee80211_fragment_entry *
774ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
775 unsigned int frag, unsigned int seq, int rx_queue,
776 struct sk_buff **skb)
777{
778 struct ieee80211_fragment_entry *entry;
779 int idx;
780
781 idx = sdata->fragment_next;
782 entry = &sdata->fragments[sdata->fragment_next++];
783 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
784 sdata->fragment_next = 0;
785
786 if (!skb_queue_empty(&entry->skb_list)) {
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200787#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg571ecf62007-07-27 15:43:22 +0200788 struct ieee80211_hdr *hdr =
789 (struct ieee80211_hdr *) entry->skb_list.next->data;
Joe Perches0795af52007-10-03 17:59:30 -0700790 DECLARE_MAC_BUF(mac);
791 DECLARE_MAC_BUF(mac2);
Johannes Berg571ecf62007-07-27 15:43:22 +0200792 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
793 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
Joe Perches0795af52007-10-03 17:59:30 -0700794 "addr1=%s addr2=%s\n",
Johannes Berg571ecf62007-07-27 15:43:22 +0200795 sdata->dev->name, idx,
796 jiffies - entry->first_frag_time, entry->seq,
Joe Perches0795af52007-10-03 17:59:30 -0700797 entry->last_frag, print_mac(mac, hdr->addr1),
798 print_mac(mac2, hdr->addr2));
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200799#endif
Johannes Berg571ecf62007-07-27 15:43:22 +0200800 __skb_queue_purge(&entry->skb_list);
801 }
802
803 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
804 *skb = NULL;
805 entry->first_frag_time = jiffies;
806 entry->seq = seq;
807 entry->rx_queue = rx_queue;
808 entry->last_frag = frag;
809 entry->ccmp = 0;
810 entry->extra_len = 0;
811
812 return entry;
813}
814
815static inline struct ieee80211_fragment_entry *
816ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
817 u16 fc, unsigned int frag, unsigned int seq,
818 int rx_queue, struct ieee80211_hdr *hdr)
819{
820 struct ieee80211_fragment_entry *entry;
821 int i, idx;
822
823 idx = sdata->fragment_next;
824 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
825 struct ieee80211_hdr *f_hdr;
826 u16 f_fc;
827
828 idx--;
829 if (idx < 0)
830 idx = IEEE80211_FRAGMENT_MAX - 1;
831
832 entry = &sdata->fragments[idx];
833 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
834 entry->rx_queue != rx_queue ||
835 entry->last_frag + 1 != frag)
836 continue;
837
838 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
839 f_fc = le16_to_cpu(f_hdr->frame_control);
840
841 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
842 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
843 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
844 continue;
845
S.Çağlar Onurab466232008-02-14 17:36:47 +0200846 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200847 __skb_queue_purge(&entry->skb_list);
848 continue;
849 }
850 return entry;
851 }
852
853 return NULL;
854}
855
Johannes Berg49461622008-06-30 15:10:45 +0200856static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100857ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200858{
859 struct ieee80211_hdr *hdr;
860 u16 sc;
861 unsigned int frag, seq;
862 struct ieee80211_fragment_entry *entry;
863 struct sk_buff *skb;
Joe Perches0795af52007-10-03 17:59:30 -0700864 DECLARE_MAC_BUF(mac);
Johannes Berg571ecf62007-07-27 15:43:22 +0200865
866 hdr = (struct ieee80211_hdr *) rx->skb->data;
867 sc = le16_to_cpu(hdr->seq_ctrl);
868 frag = sc & IEEE80211_SCTL_FRAG;
869
870 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
871 (rx->skb)->len < 24 ||
872 is_multicast_ether_addr(hdr->addr1))) {
873 /* not fragmented */
874 goto out;
875 }
876 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
877
878 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
879
880 if (frag == 0) {
881 /* This is the first fragment of a new frame. */
882 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg5cf121c2008-02-25 16:27:43 +0100883 rx->queue, &(rx->skb));
Johannes Berg8f20fc22007-08-28 17:01:54 -0400884 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
Johannes Berg571ecf62007-07-27 15:43:22 +0200885 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
886 /* Store CCMP PN so that we can verify that the next
887 * fragment has a sequential PN value. */
888 entry->ccmp = 1;
889 memcpy(entry->last_pn,
Johannes Berg5cf121c2008-02-25 16:27:43 +0100890 rx->key->u.ccmp.rx_pn[rx->queue],
Johannes Berg571ecf62007-07-27 15:43:22 +0200891 CCMP_PN_LEN);
892 }
Johannes Berg9ae54c82008-01-31 19:48:20 +0100893 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200894 }
895
896 /* This is a fragment for a frame that should already be pending in
897 * fragment cache. Add this fragment to the end of the pending entry.
898 */
899 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
Johannes Berg5cf121c2008-02-25 16:27:43 +0100900 rx->queue, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +0200901 if (!entry) {
902 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100903 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200904 }
905
906 /* Verify that MPDUs within one MSDU have sequential PN values.
907 * (IEEE 802.11i, 8.3.3.4.5) */
908 if (entry->ccmp) {
909 int i;
910 u8 pn[CCMP_PN_LEN], *rpn;
Johannes Berg8f20fc22007-08-28 17:01:54 -0400911 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100912 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200913 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
914 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
915 pn[i]++;
916 if (pn[i])
917 break;
918 }
Johannes Berg5cf121c2008-02-25 16:27:43 +0100919 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200920 if (memcmp(pn, rpn, CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +0100921 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200922 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
923 }
924
925 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
926 __skb_queue_tail(&entry->skb_list, rx->skb);
927 entry->last_frag = frag;
928 entry->extra_len += rx->skb->len;
929 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
930 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +0100931 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200932 }
933
934 rx->skb = __skb_dequeue(&entry->skb_list);
935 if (skb_tailroom(rx->skb) < entry->extra_len) {
936 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
937 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
938 GFP_ATOMIC))) {
939 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
940 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100941 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200942 }
943 }
944 while ((skb = __skb_dequeue(&entry->skb_list))) {
945 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
946 dev_kfree_skb(skb);
947 }
948
949 /* Complete frame has been reassembled - process it now */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100950 rx->flags |= IEEE80211_RX_FRAGMENTED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200951
952 out:
953 if (rx->sta)
954 rx->sta->rx_packets++;
955 if (is_multicast_ether_addr(hdr->addr1))
956 rx->local->dot11MulticastReceivedFrameCount++;
957 else
958 ieee80211_led_rx(rx->local);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100959 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200960}
961
Johannes Berg49461622008-06-30 15:10:45 +0200962static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100963ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200964{
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +0200965 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
Johannes Berg571ecf62007-07-27 15:43:22 +0200966 struct sk_buff *skb;
967 int no_pending_pkts;
Joe Perches0795af52007-10-03 17:59:30 -0700968 DECLARE_MAC_BUF(mac);
Johannes Berg571ecf62007-07-27 15:43:22 +0200969
970 if (likely(!rx->sta ||
971 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
972 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
Johannes Berg5cf121c2008-02-25 16:27:43 +0100973 !(rx->flags & IEEE80211_RX_RA_MATCH)))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100974 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200975
Johannes Berg51fb61e2007-12-19 01:31:27 +0100976 if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
977 (sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
Johannes Berge4c26ad2008-01-31 19:48:21 +0100978 return RX_DROP_UNUSABLE;
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +0200979
Johannes Berg571ecf62007-07-27 15:43:22 +0200980 skb = skb_dequeue(&rx->sta->tx_filtered);
981 if (!skb) {
982 skb = skb_dequeue(&rx->sta->ps_tx_buf);
983 if (skb)
984 rx->local->total_ps_buffered--;
985 }
986 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
987 skb_queue_empty(&rx->sta->ps_tx_buf);
988
989 if (skb) {
990 struct ieee80211_hdr *hdr =
991 (struct ieee80211_hdr *) skb->data;
992
Johannes Berg4a9a66e2008-02-19 11:31:14 +0100993 /*
994 * Tell TX path to send one frame even though the STA may
995 * still remain is PS mode after this frame exchange.
996 */
Johannes Berg07346f812008-05-03 01:02:02 +0200997 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
Johannes Berg571ecf62007-07-27 15:43:22 +0200998
999#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -07001000 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
1001 print_mac(mac, rx->sta->addr), rx->sta->aid,
Johannes Berg571ecf62007-07-27 15:43:22 +02001002 skb_queue_len(&rx->sta->ps_tx_buf));
1003#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1004
1005 /* Use MoreData flag to indicate whether there are more
1006 * buffered frames for this STA */
Johannes Berg836341a2008-02-20 02:07:21 +01001007 if (no_pending_pkts)
Johannes Berg571ecf62007-07-27 15:43:22 +02001008 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
Johannes Berg836341a2008-02-20 02:07:21 +01001009 else
Johannes Berg571ecf62007-07-27 15:43:22 +02001010 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1011
1012 dev_queue_xmit(skb);
1013
Johannes Berg004c8722008-02-20 11:21:35 +01001014 if (no_pending_pkts)
1015 sta_info_clear_tim_bit(rx->sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001016#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg5cf121c2008-02-25 16:27:43 +01001017 } else if (!rx->sent_ps_buffered) {
Johannes Berg004c8722008-02-20 11:21:35 +01001018 /*
1019 * FIXME: This can be the result of a race condition between
1020 * us expiring a frame and the station polling for it.
1021 * Should we send it a null-func frame indicating we
1022 * have nothing buffered for it?
1023 */
Joe Perches0795af52007-10-03 17:59:30 -07001024 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001025 "though there are no buffered frames for it\n",
Joe Perches0795af52007-10-03 17:59:30 -07001026 rx->dev->name, print_mac(mac, rx->sta->addr));
Johannes Berg571ecf62007-07-27 15:43:22 +02001027#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg571ecf62007-07-27 15:43:22 +02001028 }
1029
Johannes Berg9ae54c82008-01-31 19:48:20 +01001030 /* Free PS Poll skb here instead of returning RX_DROP that would
Johannes Berg571ecf62007-07-27 15:43:22 +02001031 * count as an dropped frame. */
1032 dev_kfree_skb(rx->skb);
1033
Johannes Berg9ae54c82008-01-31 19:48:20 +01001034 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001035}
1036
Johannes Berg49461622008-06-30 15:10:45 +02001037static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001038ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +02001039{
Johannes Berg6e0d1142007-07-27 15:43:22 +02001040 u8 *data = rx->skb->data;
Harvey Harrison238f74a2008-07-02 11:05:34 -07001041 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001042
Harvey Harrison238f74a2008-07-02 11:05:34 -07001043 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001044 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001045
1046 /* remove the qos control field, update frame type and meta-data */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001047 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1048 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1049 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001050 /* change frame type to non QOS */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001051 rx->fc &= ~IEEE80211_STYPE_QOS_DATA;
1052 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001053
Johannes Berg9ae54c82008-01-31 19:48:20 +01001054 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001055}
1056
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001057static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001058ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001059{
Johannes Berg07346f812008-05-03 01:02:02 +02001060 if (unlikely(!rx->sta ||
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001061 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001062 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001063
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001064 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001065}
1066
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001067static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001068ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001069{
Johannes Berg3017b802007-08-28 17:01:53 -04001070 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001071 * Pass through unencrypted frames if the hardware has
1072 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001073 */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001074 if (rx->status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001075 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001076
1077 /* Drop unencrypted frames if key is set. */
1078 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
1079 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
1080 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001081 (rx->key || rx->sdata->drop_unencrypted)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001082 return -EACCES;
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001083
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001084 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001085}
1086
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001087static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001088ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001089{
1090 struct net_device *dev = rx->dev;
Johannes Berg571ecf62007-07-27 15:43:22 +02001091 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1092 u16 fc, hdrlen, ethertype;
1093 u8 *payload;
1094 u8 dst[ETH_ALEN];
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301095 u8 src[ETH_ALEN] __aligned(2);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001096 struct sk_buff *skb = rx->skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001097 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Joe Perches0795af52007-10-03 17:59:30 -07001098 DECLARE_MAC_BUF(mac);
1099 DECLARE_MAC_BUF(mac2);
1100 DECLARE_MAC_BUF(mac3);
1101 DECLARE_MAC_BUF(mac4);
Johannes Berg571ecf62007-07-27 15:43:22 +02001102
1103 fc = rx->fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001104
1105 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001106 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001107
1108 hdrlen = ieee80211_get_hdrlen(fc);
1109
Johannes Berg902acc72008-02-23 15:17:19 +01001110 if (ieee80211_vif_is_mesh(&sdata->vif)) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001111 int meshhdrlen = ieee80211_get_mesh_hdrlen(
1112 (struct ieee80211s_hdr *) (skb->data + hdrlen));
1113 /* Copy on cb:
1114 * - mesh header: to be used for mesh forwarding
1115 * decision. It will also be used as mesh header template at
1116 * tx.c:ieee80211_subif_start_xmit() if interface
1117 * type is mesh and skb->pkt_type == PACKET_OTHERHOST
1118 * - ta: to be used if a RERR needs to be sent.
1119 */
1120 memcpy(skb->cb, skb->data + hdrlen, meshhdrlen);
1121 memcpy(MESH_PREQ(skb), hdr->addr2, ETH_ALEN);
1122 hdrlen += meshhdrlen;
1123 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001124
Johannes Berg571ecf62007-07-27 15:43:22 +02001125 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1126 * header
1127 * IEEE 802.11 address fields:
1128 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1129 * 0 0 DA SA BSSID n/a
1130 * 0 1 DA BSSID SA n/a
1131 * 1 0 BSSID SA DA n/a
1132 * 1 1 RA TA DA SA
1133 */
1134
1135 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1136 case IEEE80211_FCTL_TODS:
1137 /* BSSID SA DA */
1138 memcpy(dst, hdr->addr3, ETH_ALEN);
1139 memcpy(src, hdr->addr2, ETH_ALEN);
1140
Johannes Berg51fb61e2007-12-19 01:31:27 +01001141 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP &&
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001142 sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001143 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001144 break;
1145 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1146 /* RA TA DA SA */
1147 memcpy(dst, hdr->addr3, ETH_ALEN);
1148 memcpy(src, hdr->addr4, ETH_ALEN);
1149
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001150 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS &&
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001151 sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001152 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001153 break;
1154 case IEEE80211_FCTL_FROMDS:
1155 /* DA BSSID SA */
1156 memcpy(dst, hdr->addr1, ETH_ALEN);
1157 memcpy(src, hdr->addr3, ETH_ALEN);
1158
Johannes Berg51fb61e2007-12-19 01:31:27 +01001159 if (sdata->vif.type != IEEE80211_IF_TYPE_STA ||
John W. Linvilleb3316152007-08-28 17:01:55 -04001160 (is_multicast_ether_addr(dst) &&
1161 !compare_ether_addr(src, dev->dev_addr)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001162 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001163 break;
1164 case 0:
1165 /* DA SA BSSID */
1166 memcpy(dst, hdr->addr1, ETH_ALEN);
1167 memcpy(src, hdr->addr2, ETH_ALEN);
1168
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001169 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001170 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001171 break;
1172 }
1173
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001174 if (unlikely(skb->len - hdrlen < 8))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001175 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001176
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001177 payload = skb->data + hdrlen;
Johannes Berg571ecf62007-07-27 15:43:22 +02001178 ethertype = (payload[6] << 8) | payload[7];
1179
1180 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1181 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1182 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1183 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1184 * replace EtherType */
1185 skb_pull(skb, hdrlen + 6);
1186 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1187 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1188 } else {
1189 struct ethhdr *ehdr;
1190 __be16 len;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001191
Johannes Berg571ecf62007-07-27 15:43:22 +02001192 skb_pull(skb, hdrlen);
1193 len = htons(skb->len);
1194 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1195 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1196 memcpy(ehdr->h_source, src, ETH_ALEN);
1197 ehdr->h_proto = len;
1198 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001199 return 0;
1200}
Johannes Berg571ecf62007-07-27 15:43:22 +02001201
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001202/*
1203 * requires that rx->skb is a frame with ethernet header
1204 */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001205static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001206{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301207 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001208 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1209 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1210
1211 /*
1212 * Allow EAPOL frames to us/the PAE group address regardless
1213 * of whether the frame was encrypted or not.
1214 */
1215 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1216 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1217 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1218 return true;
1219
1220 if (ieee80211_802_1x_port_control(rx) ||
1221 ieee80211_drop_unencrypted(rx))
1222 return false;
1223
1224 return true;
1225}
1226
1227/*
1228 * requires that rx->skb is a frame with ethernet header
1229 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001230static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01001231ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001232{
1233 struct net_device *dev = rx->dev;
1234 struct ieee80211_local *local = rx->local;
1235 struct sk_buff *skb, *xmit_skb;
1236 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001237 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1238 struct sta_info *dsta;
Johannes Berg571ecf62007-07-27 15:43:22 +02001239
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001240 skb = rx->skb;
1241 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001242
Johannes Berg51fb61e2007-12-19 01:31:27 +01001243 if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP ||
1244 sdata->vif.type == IEEE80211_IF_TYPE_VLAN) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +01001245 (rx->flags & IEEE80211_RX_RA_MATCH)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001246 if (is_multicast_ether_addr(ehdr->h_dest)) {
1247 /*
1248 * send multicast frames both to higher layers in
1249 * local net stack and back to the wireless medium
1250 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001251 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1252 if (!xmit_skb && net_ratelimit())
Johannes Berg571ecf62007-07-27 15:43:22 +02001253 printk(KERN_DEBUG "%s: failed to clone "
1254 "multicast frame\n", dev->name);
1255 } else {
Johannes Berg571ecf62007-07-27 15:43:22 +02001256 dsta = sta_info_get(local, skb->data);
Johannes Bergd0709a62008-02-25 16:27:46 +01001257 if (dsta && dsta->sdata->dev == dev) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001258 /*
1259 * The destination station is associated to
1260 * this AP (in this VLAN), so send the frame
1261 * directly to it and do not pass it to local
1262 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02001263 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001264 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001265 skb = NULL;
1266 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001267 }
1268 }
1269
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001270 /* Mesh forwarding */
Johannes Berg902acc72008-02-23 15:17:19 +01001271 if (ieee80211_vif_is_mesh(&sdata->vif)) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001272 u8 *mesh_ttl = &((struct ieee80211s_hdr *)skb->cb)->ttl;
1273 (*mesh_ttl)--;
1274
1275 if (is_multicast_ether_addr(skb->data)) {
1276 if (*mesh_ttl > 0) {
1277 xmit_skb = skb_copy(skb, GFP_ATOMIC);
Luis Carlos Cobo69687a02008-05-05 12:29:42 -07001278 if (xmit_skb)
1279 xmit_skb->pkt_type = PACKET_OTHERHOST;
1280 else if (net_ratelimit())
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001281 printk(KERN_DEBUG "%s: failed to clone "
1282 "multicast frame\n", dev->name);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001283 } else
Johannes Berg902acc72008-02-23 15:17:19 +01001284 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta,
1285 dropped_frames_ttl);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001286 } else if (skb->pkt_type != PACKET_OTHERHOST &&
1287 compare_ether_addr(dev->dev_addr, skb->data) != 0) {
1288 if (*mesh_ttl == 0) {
Johannes Berg902acc72008-02-23 15:17:19 +01001289 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta,
1290 dropped_frames_ttl);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001291 dev_kfree_skb(skb);
1292 skb = NULL;
1293 } else {
1294 xmit_skb = skb;
1295 xmit_skb->pkt_type = PACKET_OTHERHOST;
1296 if (!(dev->flags & IFF_PROMISC))
1297 skb = NULL;
1298 }
1299 }
1300 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001301
Johannes Berg571ecf62007-07-27 15:43:22 +02001302 if (skb) {
1303 /* deliver to local stack */
1304 skb->protocol = eth_type_trans(skb, dev);
1305 memset(skb->cb, 0, sizeof(skb->cb));
1306 netif_rx(skb);
1307 }
1308
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001309 if (xmit_skb) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001310 /* send to wireless media */
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09001311 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001312 skb_reset_network_header(xmit_skb);
1313 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001314 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001315 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001316}
1317
Johannes Berg49461622008-06-30 15:10:45 +02001318static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001319ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001320{
1321 struct net_device *dev = rx->dev;
1322 struct ieee80211_local *local = rx->local;
1323 u16 fc, ethertype;
1324 u8 *payload;
1325 struct sk_buff *skb = rx->skb, *frame = NULL;
1326 const struct ethhdr *eth;
1327 int remaining, err;
1328 u8 dst[ETH_ALEN];
1329 u8 src[ETH_ALEN];
1330 DECLARE_MAC_BUF(mac);
1331
1332 fc = rx->fc;
1333 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001334 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001335
1336 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001337 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001338
Johannes Berg5cf121c2008-02-25 16:27:43 +01001339 if (!(rx->flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001340 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001341
1342 err = ieee80211_data_to_8023(rx);
1343 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001344 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001345
1346 skb->dev = dev;
1347
1348 dev->stats.rx_packets++;
1349 dev->stats.rx_bytes += skb->len;
1350
1351 /* skip the wrapping header */
1352 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1353 if (!eth)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001354 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001355
1356 while (skb != frame) {
1357 u8 padding;
1358 __be16 len = eth->h_proto;
1359 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1360
1361 remaining = skb->len;
1362 memcpy(dst, eth->h_dest, ETH_ALEN);
1363 memcpy(src, eth->h_source, ETH_ALEN);
1364
1365 padding = ((4 - subframe_len) & 0x3);
1366 /* the last MSDU has no padding */
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001367 if (subframe_len > remaining)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001368 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001369
1370 skb_pull(skb, sizeof(struct ethhdr));
1371 /* if last subframe reuse skb */
1372 if (remaining <= subframe_len + padding)
1373 frame = skb;
1374 else {
1375 frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1376 subframe_len);
1377
1378 if (frame == NULL)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001379 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001380
1381 skb_reserve(frame, local->hw.extra_tx_headroom +
1382 sizeof(struct ethhdr));
1383 memcpy(skb_put(frame, ntohs(len)), skb->data,
1384 ntohs(len));
1385
1386 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1387 padding);
1388 if (!eth) {
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001389 dev_kfree_skb(frame);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001390 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001391 }
1392 }
1393
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001394 skb_reset_network_header(frame);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001395 frame->dev = dev;
1396 frame->priority = skb->priority;
1397 rx->skb = frame;
1398
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001399 payload = frame->data;
1400 ethertype = (payload[6] << 8) | payload[7];
1401
1402 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001403 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1404 compare_ether_addr(payload,
1405 bridge_tunnel_header) == 0)) {
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001406 /* remove RFC1042 or Bridge-Tunnel
1407 * encapsulation and replace EtherType */
1408 skb_pull(frame, 6);
1409 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1410 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1411 } else {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001412 memcpy(skb_push(frame, sizeof(__be16)),
1413 &len, sizeof(__be16));
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001414 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1415 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1416 }
1417
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001418 if (!ieee80211_frame_allowed(rx)) {
1419 if (skb == frame) /* last frame */
Johannes Berge4c26ad2008-01-31 19:48:21 +01001420 return RX_DROP_UNUSABLE;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001421 dev_kfree_skb(frame);
1422 continue;
1423 }
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001424
1425 ieee80211_deliver_skb(rx);
1426 }
1427
Johannes Berg9ae54c82008-01-31 19:48:20 +01001428 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001429}
1430
Johannes Berg49461622008-06-30 15:10:45 +02001431static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001432ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001433{
1434 struct net_device *dev = rx->dev;
1435 u16 fc;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001436 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001437
1438 fc = rx->fc;
1439 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001440 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001441
1442 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001443 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001444
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001445 err = ieee80211_data_to_8023(rx);
1446 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001447 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001448
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001449 if (!ieee80211_frame_allowed(rx))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001450 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001451
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001452 rx->skb->dev = dev;
1453
1454 dev->stats.rx_packets++;
1455 dev->stats.rx_bytes += rx->skb->len;
1456
1457 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02001458
Johannes Berg9ae54c82008-01-31 19:48:20 +01001459 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001460}
1461
Johannes Berg49461622008-06-30 15:10:45 +02001462static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001463ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
Ron Rindjunsky71364712007-12-25 17:00:36 +02001464{
1465 struct ieee80211_local *local = rx->local;
1466 struct ieee80211_hw *hw = &local->hw;
1467 struct sk_buff *skb = rx->skb;
1468 struct ieee80211_bar *bar = (struct ieee80211_bar *) skb->data;
1469 struct tid_ampdu_rx *tid_agg_rx;
1470 u16 start_seq_num;
1471 u16 tid;
1472
1473 if (likely((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001474 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001475
1476 if ((rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BACK_REQ) {
1477 if (!rx->sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001478 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001479 tid = le16_to_cpu(bar->control) >> 12;
Ron Rindjunskycee24a32008-03-26 20:36:03 +02001480 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1481 != HT_AGG_STATE_OPERATIONAL)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001482 return RX_CONTINUE;
Ron Rindjunskycee24a32008-03-26 20:36:03 +02001483 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
Ron Rindjunsky71364712007-12-25 17:00:36 +02001484
1485 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1486
1487 /* reset session timer */
1488 if (tid_agg_rx->timeout) {
1489 unsigned long expires =
1490 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1491 mod_timer(&tid_agg_rx->session_timer, expires);
1492 }
1493
1494 /* manage reordering buffer according to requested */
1495 /* sequence number */
1496 rcu_read_lock();
1497 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1498 start_seq_num, 1);
1499 rcu_read_unlock();
Johannes Berge4c26ad2008-01-31 19:48:21 +01001500 return RX_DROP_UNUSABLE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001501 }
1502
Johannes Berg9ae54c82008-01-31 19:48:20 +01001503 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001504}
1505
Johannes Berg49461622008-06-30 15:10:45 +02001506static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001507ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001508{
1509 struct ieee80211_sub_if_data *sdata;
1510
Johannes Berg5cf121c2008-02-25 16:27:43 +01001511 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001512 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001513
1514 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
Johannes Berg51fb61e2007-12-19 01:31:27 +01001515 if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001516 sdata->vif.type == IEEE80211_IF_TYPE_IBSS ||
1517 sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) &&
Johannes Bergddd3d2b2007-09-26 17:53:20 +02001518 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
Johannes Berg5cf121c2008-02-25 16:27:43 +01001519 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->status);
Johannes Bergf9d540e2007-09-28 14:02:09 +02001520 else
Johannes Berge4c26ad2008-01-31 19:48:21 +01001521 return RX_DROP_MONITOR;
Johannes Bergf9d540e2007-09-28 14:02:09 +02001522
Johannes Berg9ae54c82008-01-31 19:48:20 +01001523 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001524}
1525
Johannes Berg571ecf62007-07-27 15:43:22 +02001526static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1527 struct ieee80211_hdr *hdr,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001528 struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001529{
1530 int keyidx, hdrlen;
Joe Perches0795af52007-10-03 17:59:30 -07001531 DECLARE_MAC_BUF(mac);
1532 DECLARE_MAC_BUF(mac2);
Johannes Berg571ecf62007-07-27 15:43:22 +02001533
1534 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1535 if (rx->skb->len >= hdrlen + 4)
1536 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1537 else
1538 keyidx = -1;
1539
Johannes Berg8944b792008-01-31 19:48:26 +01001540 if (!rx->sta) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001541 /*
1542 * Some hardware seem to generate incorrect Michael MIC
1543 * reports; ignore them to avoid triggering countermeasures.
1544 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001545 goto ignore;
1546 }
1547
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001548 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
Johannes Berg571ecf62007-07-27 15:43:22 +02001549 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001550
Johannes Berg51fb61e2007-12-19 01:31:27 +01001551 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001552 /*
1553 * APs with pairwise keys should never receive Michael MIC
1554 * errors for non-zero keyidx because these are reserved for
1555 * group keys and only the AP is sending real multicast
1556 * frames in the BSS.
1557 */
Johannes Bergeb063c12007-08-28 17:01:53 -04001558 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001559 }
1560
1561 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1562 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001563 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH))
Johannes Berg571ecf62007-07-27 15:43:22 +02001564 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001565
Johannes Bergeb063c12007-08-28 17:01:53 -04001566 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001567 ignore:
1568 dev_kfree_skb(rx->skb);
1569 rx->skb = NULL;
1570}
1571
Johannes Berg5cf121c2008-02-25 16:27:43 +01001572/* TODO: use IEEE80211_RX_FRAGMENTED */
1573static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
Michael Wu3d30d942008-01-31 19:48:27 +01001574{
1575 struct ieee80211_sub_if_data *sdata;
1576 struct ieee80211_local *local = rx->local;
1577 struct ieee80211_rtap_hdr {
1578 struct ieee80211_radiotap_header hdr;
1579 u8 flags;
1580 u8 rate;
1581 __le16 chan_freq;
1582 __le16 chan_flags;
1583 } __attribute__ ((packed)) *rthdr;
1584 struct sk_buff *skb = rx->skb, *skb2;
1585 struct net_device *prev_dev = NULL;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001586 struct ieee80211_rx_status *status = rx->status;
Michael Wu3d30d942008-01-31 19:48:27 +01001587
Johannes Berg5cf121c2008-02-25 16:27:43 +01001588 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
Michael Wu3d30d942008-01-31 19:48:27 +01001589 goto out_free_skb;
1590
1591 if (skb_headroom(skb) < sizeof(*rthdr) &&
1592 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1593 goto out_free_skb;
1594
1595 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1596 memset(rthdr, 0, sizeof(*rthdr));
1597 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1598 rthdr->hdr.it_present =
1599 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1600 (1 << IEEE80211_RADIOTAP_RATE) |
1601 (1 << IEEE80211_RADIOTAP_CHANNEL));
1602
Johannes Berg5cf121c2008-02-25 16:27:43 +01001603 rthdr->rate = rx->rate->bitrate / 5;
Michael Wu3d30d942008-01-31 19:48:27 +01001604 rthdr->chan_freq = cpu_to_le16(status->freq);
1605
1606 if (status->band == IEEE80211_BAND_5GHZ)
1607 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1608 IEEE80211_CHAN_5GHZ);
1609 else
1610 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1611 IEEE80211_CHAN_2GHZ);
1612
1613 skb_set_mac_header(skb, 0);
1614 skb->ip_summed = CHECKSUM_UNNECESSARY;
1615 skb->pkt_type = PACKET_OTHERHOST;
1616 skb->protocol = htons(ETH_P_802_2);
1617
1618 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1619 if (!netif_running(sdata->dev))
1620 continue;
1621
1622 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR ||
1623 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1624 continue;
1625
1626 if (prev_dev) {
1627 skb2 = skb_clone(skb, GFP_ATOMIC);
1628 if (skb2) {
1629 skb2->dev = prev_dev;
1630 netif_rx(skb2);
1631 }
1632 }
1633
1634 prev_dev = sdata->dev;
1635 sdata->dev->stats.rx_packets++;
1636 sdata->dev->stats.rx_bytes += skb->len;
1637 }
1638
1639 if (prev_dev) {
1640 skb->dev = prev_dev;
1641 netif_rx(skb);
1642 skb = NULL;
1643 } else
1644 goto out_free_skb;
1645
Johannes Berg5cf121c2008-02-25 16:27:43 +01001646 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
Michael Wu3d30d942008-01-31 19:48:27 +01001647 return;
1648
1649 out_free_skb:
1650 dev_kfree_skb(skb);
1651}
1652
Johannes Berg571ecf62007-07-27 15:43:22 +02001653
Johannes Berg8944b792008-01-31 19:48:26 +01001654static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001655 struct ieee80211_rx_data *rx,
Johannes Berg8944b792008-01-31 19:48:26 +01001656 struct sk_buff *skb)
Johannes Berg58905292008-01-31 19:48:25 +01001657{
Johannes Berg58905292008-01-31 19:48:25 +01001658 ieee80211_rx_result res = RX_DROP_MONITOR;
1659
Johannes Berg8944b792008-01-31 19:48:26 +01001660 rx->skb = skb;
1661 rx->sdata = sdata;
1662 rx->dev = sdata->dev;
1663
Johannes Berg49461622008-06-30 15:10:45 +02001664#define CALL_RXH(rxh) \
1665 res = rxh(rx); \
1666 if (res != RX_CONTINUE) \
1667 goto rxh_done;
Johannes Berg58905292008-01-31 19:48:25 +01001668
Johannes Berg49461622008-06-30 15:10:45 +02001669 CALL_RXH(ieee80211_rx_h_passive_scan)
1670 CALL_RXH(ieee80211_rx_h_check)
1671 CALL_RXH(ieee80211_rx_h_decrypt)
1672 CALL_RXH(ieee80211_rx_h_sta_process)
1673 CALL_RXH(ieee80211_rx_h_defragment)
1674 CALL_RXH(ieee80211_rx_h_ps_poll)
1675 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1676 /* must be after MMIC verify so header is counted in MPDU mic */
1677 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1678 CALL_RXH(ieee80211_rx_h_amsdu)
1679 CALL_RXH(ieee80211_rx_h_data)
1680 CALL_RXH(ieee80211_rx_h_ctrl)
1681 CALL_RXH(ieee80211_rx_h_mgmt)
Johannes Berg58905292008-01-31 19:48:25 +01001682
Johannes Berg49461622008-06-30 15:10:45 +02001683#undef CALL_RXH
1684
1685 rxh_done:
Johannes Berg58905292008-01-31 19:48:25 +01001686 switch (res) {
Michael Wu3d30d942008-01-31 19:48:27 +01001687 case RX_DROP_MONITOR:
Johannes Berg49461622008-06-30 15:10:45 +02001688 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1689 if (rx->sta)
1690 rx->sta->rx_dropped++;
1691 /* fall through */
1692 case RX_CONTINUE:
Michael Wu3d30d942008-01-31 19:48:27 +01001693 ieee80211_rx_cooked_monitor(rx);
1694 break;
1695 case RX_DROP_UNUSABLE:
Johannes Berg49461622008-06-30 15:10:45 +02001696 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1697 if (rx->sta)
1698 rx->sta->rx_dropped++;
Johannes Berg58905292008-01-31 19:48:25 +01001699 dev_kfree_skb(rx->skb);
1700 break;
Johannes Berg49461622008-06-30 15:10:45 +02001701 case RX_QUEUED:
1702 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1703 break;
Johannes Berg58905292008-01-31 19:48:25 +01001704 }
1705}
1706
Johannes Berg571ecf62007-07-27 15:43:22 +02001707/* main receive path */
1708
Johannes Berg23a24de2007-07-27 15:43:22 +02001709static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001710 u8 *bssid, struct ieee80211_rx_data *rx,
Johannes Berg23a24de2007-07-27 15:43:22 +02001711 struct ieee80211_hdr *hdr)
1712{
1713 int multicast = is_multicast_ether_addr(hdr->addr1);
1714
Johannes Berg51fb61e2007-12-19 01:31:27 +01001715 switch (sdata->vif.type) {
Johannes Berg23a24de2007-07-27 15:43:22 +02001716 case IEEE80211_IF_TYPE_STA:
1717 if (!bssid)
1718 return 0;
1719 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01001720 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02001721 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001722 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001723 } else if (!multicast &&
1724 compare_ether_addr(sdata->dev->dev_addr,
1725 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04001726 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02001727 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001728 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001729 }
1730 break;
1731 case IEEE80211_IF_TYPE_IBSS:
1732 if (!bssid)
1733 return 0;
Bruno Randolf9d9bf772008-02-18 11:21:36 +09001734 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
Vladimir Koutny87291c02008-06-13 16:50:44 +02001735 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) {
1736 if (!rx->sta)
1737 rx->sta = ieee80211_ibss_add_sta(sdata->dev,
1738 rx->skb, bssid, hdr->addr2,
1739 BIT(rx->status->rate_idx));
Bruno Randolf9d9bf772008-02-18 11:21:36 +09001740 return 1;
Vladimir Koutny87291c02008-06-13 16:50:44 +02001741 }
Bruno Randolf9d9bf772008-02-18 11:21:36 +09001742 else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01001743 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02001744 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001745 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001746 } else if (!multicast &&
1747 compare_ether_addr(sdata->dev->dev_addr,
1748 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04001749 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02001750 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001751 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001752 } else if (!rx->sta)
1753 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
Vladimir Koutny87291c02008-06-13 16:50:44 +02001754 bssid, hdr->addr2,
1755 BIT(rx->status->rate_idx));
Johannes Berg23a24de2007-07-27 15:43:22 +02001756 break;
Johannes Berg6032f932008-02-23 15:17:07 +01001757 case IEEE80211_IF_TYPE_MESH_POINT:
1758 if (!multicast &&
1759 compare_ether_addr(sdata->dev->dev_addr,
1760 hdr->addr1) != 0) {
1761 if (!(sdata->dev->flags & IFF_PROMISC))
1762 return 0;
1763
Johannes Berg5cf121c2008-02-25 16:27:43 +01001764 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg6032f932008-02-23 15:17:07 +01001765 }
1766 break;
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02001767 case IEEE80211_IF_TYPE_VLAN:
Johannes Berg23a24de2007-07-27 15:43:22 +02001768 case IEEE80211_IF_TYPE_AP:
1769 if (!bssid) {
1770 if (compare_ether_addr(sdata->dev->dev_addr,
1771 hdr->addr1))
1772 return 0;
1773 } else if (!ieee80211_bssid_match(bssid,
1774 sdata->dev->dev_addr)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01001775 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02001776 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001777 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001778 }
Jiri Slabybadffb72007-08-28 17:01:54 -04001779 if (sdata->dev == sdata->local->mdev &&
Johannes Berg5cf121c2008-02-25 16:27:43 +01001780 !(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02001781 /* do not receive anything via
1782 * master device when not scanning */
1783 return 0;
1784 break;
1785 case IEEE80211_IF_TYPE_WDS:
1786 if (bssid ||
1787 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1788 return 0;
1789 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1790 return 0;
1791 break;
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02001792 case IEEE80211_IF_TYPE_MNTR:
1793 /* take everything */
1794 break;
Johannes Berga2897552007-09-28 14:01:25 +02001795 case IEEE80211_IF_TYPE_INVALID:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02001796 /* should never get here */
1797 WARN_ON(1);
1798 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02001799 }
1800
1801 return 1;
1802}
1803
Johannes Berg571ecf62007-07-27 15:43:22 +02001804/*
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02001805 * This is the actual Rx frames handler. as it blongs to Rx path it must
1806 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02001807 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02001808static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
1809 struct sk_buff *skb,
1810 struct ieee80211_rx_status *status,
Johannes Berg8318d782008-01-24 19:38:38 +01001811 struct ieee80211_rate *rate)
Johannes Berg571ecf62007-07-27 15:43:22 +02001812{
1813 struct ieee80211_local *local = hw_to_local(hw);
1814 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02001815 struct ieee80211_hdr *hdr;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001816 struct ieee80211_rx_data rx;
Johannes Berg571ecf62007-07-27 15:43:22 +02001817 u16 type;
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02001818 int prepares;
Johannes Berg8e6f0032007-07-27 15:43:22 +02001819 struct ieee80211_sub_if_data *prev = NULL;
1820 struct sk_buff *skb_new;
1821 u8 *bssid;
Johannes Berg571ecf62007-07-27 15:43:22 +02001822
1823 hdr = (struct ieee80211_hdr *) skb->data;
1824 memset(&rx, 0, sizeof(rx));
1825 rx.skb = skb;
1826 rx.local = local;
1827
Johannes Berg5cf121c2008-02-25 16:27:43 +01001828 rx.status = status;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001829 rx.rate = rate;
Johannes Bergb2e77712007-09-26 15:19:39 +02001830 rx.fc = le16_to_cpu(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +02001831 type = rx.fc & IEEE80211_FCTL_FTYPE;
Johannes Berg72abd812007-09-17 01:29:22 -04001832
Johannes Bergb2e77712007-09-26 15:19:39 +02001833 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
Johannes Berg571ecf62007-07-27 15:43:22 +02001834 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02001835
Johannes Berg8944b792008-01-31 19:48:26 +01001836 rx.sta = sta_info_get(local, hdr->addr2);
1837 if (rx.sta) {
Johannes Bergd0709a62008-02-25 16:27:46 +01001838 rx.sdata = rx.sta->sdata;
1839 rx.dev = rx.sta->sdata->dev;
Johannes Bergb2e77712007-09-26 15:19:39 +02001840 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001841
Johannes Berg571ecf62007-07-27 15:43:22 +02001842 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
Johannes Berg8944b792008-01-31 19:48:26 +01001843 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
Johannes Bergd0709a62008-02-25 16:27:46 +01001844 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02001845 }
1846
Zhu Yiece8edd2007-11-22 10:53:21 +08001847 if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
Johannes Berg5cf121c2008-02-25 16:27:43 +01001848 rx.flags |= IEEE80211_RX_IN_SCAN;
Johannes Berg571ecf62007-07-27 15:43:22 +02001849
Johannes Berg38f37142008-01-29 17:07:43 +01001850 ieee80211_parse_qos(&rx);
1851 ieee80211_verify_ip_alignment(&rx);
1852
Johannes Berg571ecf62007-07-27 15:43:22 +02001853 skb = rx.skb;
1854
Johannes Berg79010422007-09-18 17:29:21 -04001855 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg2a8a9a82007-08-28 17:01:52 -04001856 if (!netif_running(sdata->dev))
1857 continue;
1858
Johannes Berg51fb61e2007-12-19 01:31:27 +01001859 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR)
Johannes Bergb2e77712007-09-26 15:19:39 +02001860 continue;
1861
Johannes Berg51fb61e2007-12-19 01:31:27 +01001862 bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
Johannes Berg5cf121c2008-02-25 16:27:43 +01001863 rx.flags |= IEEE80211_RX_RA_MATCH;
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02001864 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
Johannes Berg23a24de2007-07-27 15:43:22 +02001865
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02001866 if (!prepares)
Johannes Berg23a24de2007-07-27 15:43:22 +02001867 continue;
Johannes Berg8e6f0032007-07-27 15:43:22 +02001868
Johannes Berg340e11f2007-07-27 15:43:22 +02001869 /*
1870 * frame is destined for this interface, but if it's not
1871 * also for the previous one we handle that after the
1872 * loop to avoid copying the SKB once too much
1873 */
1874
1875 if (!prev) {
1876 prev = sdata;
1877 continue;
Johannes Berg8e6f0032007-07-27 15:43:22 +02001878 }
Johannes Berg340e11f2007-07-27 15:43:22 +02001879
1880 /*
1881 * frame was destined for the previous interface
1882 * so invoke RX handlers for it
1883 */
1884
1885 skb_new = skb_copy(skb, GFP_ATOMIC);
1886 if (!skb_new) {
1887 if (net_ratelimit())
1888 printk(KERN_DEBUG "%s: failed to copy "
Pavel Roskina4278e12008-05-12 09:02:24 -04001889 "multicast frame for %s\n",
Johannes Bergdd1cd4c2007-09-18 17:29:20 -04001890 wiphy_name(local->hw.wiphy),
1891 prev->dev->name);
Johannes Berg340e11f2007-07-27 15:43:22 +02001892 continue;
1893 }
Helmut Schaa69f817b2007-12-21 15:16:35 +01001894 rx.fc = le16_to_cpu(hdr->frame_control);
Johannes Berg8944b792008-01-31 19:48:26 +01001895 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
Johannes Berg8e6f0032007-07-27 15:43:22 +02001896 prev = sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02001897 }
Johannes Berg8e6f0032007-07-27 15:43:22 +02001898 if (prev) {
Helmut Schaa69f817b2007-12-21 15:16:35 +01001899 rx.fc = le16_to_cpu(hdr->frame_control);
Johannes Berg8944b792008-01-31 19:48:26 +01001900 ieee80211_invoke_rx_handlers(prev, &rx, skb);
Johannes Berg8e6f0032007-07-27 15:43:22 +02001901 } else
1902 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001903}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02001904
Ron Rindjunskyb5807812007-12-25 17:00:35 +02001905#define SEQ_MODULO 0x1000
1906#define SEQ_MASK 0xfff
1907
1908static inline int seq_less(u16 sq1, u16 sq2)
1909{
1910 return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1));
1911}
1912
1913static inline u16 seq_inc(u16 sq)
1914{
1915 return ((sq + 1) & SEQ_MASK);
1916}
1917
1918static inline u16 seq_sub(u16 sq1, u16 sq2)
1919{
1920 return ((sq1 - sq2) & SEQ_MASK);
1921}
1922
1923
Ron Rindjunsky71364712007-12-25 17:00:36 +02001924/*
1925 * As it function blongs to Rx path it must be called with
1926 * the proper rcu_read_lock protection for its flow.
1927 */
Ron Rindjunskyb5807812007-12-25 17:00:35 +02001928u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
1929 struct tid_ampdu_rx *tid_agg_rx,
1930 struct sk_buff *skb, u16 mpdu_seq_num,
1931 int bar_req)
1932{
1933 struct ieee80211_local *local = hw_to_local(hw);
1934 struct ieee80211_rx_status status;
1935 u16 head_seq_num, buf_size;
1936 int index;
Johannes Berg8318d782008-01-24 19:38:38 +01001937 struct ieee80211_supported_band *sband;
1938 struct ieee80211_rate *rate;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02001939
1940 buf_size = tid_agg_rx->buf_size;
1941 head_seq_num = tid_agg_rx->head_seq_num;
1942
1943 /* frame with out of date sequence number */
1944 if (seq_less(mpdu_seq_num, head_seq_num)) {
1945 dev_kfree_skb(skb);
1946 return 1;
1947 }
1948
1949 /* if frame sequence number exceeds our buffering window size or
1950 * block Ack Request arrived - release stored frames */
1951 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
1952 /* new head to the ordering buffer */
1953 if (bar_req)
1954 head_seq_num = mpdu_seq_num;
1955 else
1956 head_seq_num =
1957 seq_inc(seq_sub(mpdu_seq_num, buf_size));
1958 /* release stored frames up to new head to stack */
1959 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1960 index = seq_sub(tid_agg_rx->head_seq_num,
1961 tid_agg_rx->ssn)
1962 % tid_agg_rx->buf_size;
1963
1964 if (tid_agg_rx->reorder_buf[index]) {
1965 /* release the reordered frames to stack */
1966 memcpy(&status,
1967 tid_agg_rx->reorder_buf[index]->cb,
1968 sizeof(status));
Johannes Berg8318d782008-01-24 19:38:38 +01001969 sband = local->hw.wiphy->bands[status.band];
1970 rate = &sband->bitrates[status.rate_idx];
Ron Rindjunskyb5807812007-12-25 17:00:35 +02001971 __ieee80211_rx_handle_packet(hw,
1972 tid_agg_rx->reorder_buf[index],
Johannes Berg9e72ebd2008-05-21 17:33:42 +02001973 &status, rate);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02001974 tid_agg_rx->stored_mpdu_num--;
1975 tid_agg_rx->reorder_buf[index] = NULL;
1976 }
1977 tid_agg_rx->head_seq_num =
1978 seq_inc(tid_agg_rx->head_seq_num);
1979 }
1980 if (bar_req)
1981 return 1;
1982 }
1983
1984 /* now the new frame is always in the range of the reordering */
1985 /* buffer window */
1986 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
1987 % tid_agg_rx->buf_size;
1988 /* check if we already stored this frame */
1989 if (tid_agg_rx->reorder_buf[index]) {
1990 dev_kfree_skb(skb);
1991 return 1;
1992 }
1993
1994 /* if arrived mpdu is in the right order and nothing else stored */
1995 /* release it immediately */
1996 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1997 tid_agg_rx->stored_mpdu_num == 0) {
1998 tid_agg_rx->head_seq_num =
1999 seq_inc(tid_agg_rx->head_seq_num);
2000 return 0;
2001 }
2002
2003 /* put the frame in the reordering buffer */
2004 tid_agg_rx->reorder_buf[index] = skb;
2005 tid_agg_rx->stored_mpdu_num++;
2006 /* release the buffer until next missing frame */
2007 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2008 % tid_agg_rx->buf_size;
2009 while (tid_agg_rx->reorder_buf[index]) {
2010 /* release the reordered frame back to stack */
2011 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2012 sizeof(status));
Johannes Berg8318d782008-01-24 19:38:38 +01002013 sband = local->hw.wiphy->bands[status.band];
2014 rate = &sband->bitrates[status.rate_idx];
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002015 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
Johannes Berg9e72ebd2008-05-21 17:33:42 +02002016 &status, rate);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002017 tid_agg_rx->stored_mpdu_num--;
2018 tid_agg_rx->reorder_buf[index] = NULL;
2019 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2020 index = seq_sub(tid_agg_rx->head_seq_num,
2021 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2022 }
2023 return 1;
2024}
2025
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002026static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2027 struct sk_buff *skb)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002028{
2029 struct ieee80211_hw *hw = &local->hw;
2030 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2031 struct sta_info *sta;
2032 struct tid_ampdu_rx *tid_agg_rx;
Harvey Harrison87228f52008-06-11 14:21:59 -07002033 u16 sc;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002034 u16 mpdu_seq_num;
Harvey Harrison182503a2008-06-22 16:45:29 -07002035 u8 ret = 0;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002036 int tid;
2037
2038 sta = sta_info_get(local, hdr->addr2);
2039 if (!sta)
2040 return ret;
2041
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002042 /* filter the QoS data rx stream according to
2043 * STA/TID and check if this STA/TID is on aggregation */
Harvey Harrison87228f52008-06-11 14:21:59 -07002044 if (!ieee80211_is_data_qos(hdr->frame_control))
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002045 goto end_reorder;
2046
Harvey Harrison238f74a2008-07-02 11:05:34 -07002047 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002048
Ron Rindjunskycee24a32008-03-26 20:36:03 +02002049 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002050 goto end_reorder;
2051
Ron Rindjunskycee24a32008-03-26 20:36:03 +02002052 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2053
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002054 /* null data frames are excluded */
Harvey Harrison87228f52008-06-11 14:21:59 -07002055 if (unlikely(ieee80211_is_nullfunc(hdr->frame_control)))
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002056 goto end_reorder;
2057
2058 /* new un-ordered ampdu frame - process it */
2059
2060 /* reset session timer */
2061 if (tid_agg_rx->timeout) {
2062 unsigned long expires =
2063 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
2064 mod_timer(&tid_agg_rx->session_timer, expires);
2065 }
2066
2067 /* if this mpdu is fragmented - terminate rx aggregation session */
2068 sc = le16_to_cpu(hdr->seq_ctrl);
2069 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Bergd0709a62008-02-25 16:27:46 +01002070 ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr,
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002071 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2072 ret = 1;
2073 goto end_reorder;
2074 }
2075
2076 /* according to mpdu sequence number deal with reordering buffer */
2077 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2078 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2079 mpdu_seq_num, 0);
Johannes Bergd0709a62008-02-25 16:27:46 +01002080 end_reorder:
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002081 return ret;
2082}
2083
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002084/*
2085 * This is the receive path handler. It is called by a low level driver when an
2086 * 802.11 MPDU is received from the hardware.
2087 */
2088void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2089 struct ieee80211_rx_status *status)
2090{
2091 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01002092 struct ieee80211_rate *rate = NULL;
2093 struct ieee80211_supported_band *sband;
2094
2095 if (status->band < 0 ||
Adrian Bunk13d8fd22008-04-23 12:51:28 +03002096 status->band >= IEEE80211_NUM_BANDS) {
Johannes Berg8318d782008-01-24 19:38:38 +01002097 WARN_ON(1);
2098 return;
2099 }
2100
2101 sband = local->hw.wiphy->bands[status->band];
2102
2103 if (!sband ||
2104 status->rate_idx < 0 ||
2105 status->rate_idx >= sband->n_bitrates) {
2106 WARN_ON(1);
2107 return;
2108 }
2109
2110 rate = &sband->bitrates[status->rate_idx];
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002111
2112 /*
2113 * key references and virtual interfaces are protected using RCU
2114 * and this requires that we are in a read-side RCU section during
2115 * receive processing
2116 */
2117 rcu_read_lock();
2118
2119 /*
2120 * Frames with failed FCS/PLCP checksum are not returned,
2121 * all other frames are returned without radiotap header
2122 * if it was previously present.
2123 * Also, frames with less than 16 bytes are dropped.
2124 */
Johannes Berg8318d782008-01-24 19:38:38 +01002125 skb = ieee80211_rx_monitor(local, skb, status, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002126 if (!skb) {
2127 rcu_read_unlock();
2128 return;
2129 }
2130
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002131 if (!ieee80211_rx_reorder_ampdu(local, skb))
Johannes Berg9e72ebd2008-05-21 17:33:42 +02002132 __ieee80211_rx_handle_packet(hw, skb, status, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002133
2134 rcu_read_unlock();
2135}
Johannes Berg571ecf62007-07-27 15:43:22 +02002136EXPORT_SYMBOL(__ieee80211_rx);
2137
2138/* This is a version of the rx handler that can be called from hard irq
2139 * context. Post the skb on the queue and schedule the tasklet */
2140void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2141 struct ieee80211_rx_status *status)
2142{
2143 struct ieee80211_local *local = hw_to_local(hw);
2144
2145 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2146
2147 skb->dev = local->mdev;
2148 /* copy status into skb->cb for use by tasklet */
2149 memcpy(skb->cb, status, sizeof(*status));
2150 skb->pkt_type = IEEE80211_RX_MSG;
2151 skb_queue_tail(&local->skb_queue, skb);
2152 tasklet_schedule(&local->tasklet);
2153}
2154EXPORT_SYMBOL(ieee80211_rx_irqsafe);