blob: f962bd1b16e2dadd032dcdcb0c35442d67e64efb [file] [log] [blame]
Johannes Berg571ecf62007-07-27 15:43:22 +02001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
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 Berg24487982009-04-23 18:52:52 +020022#include "driver-ops.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040023#include "led.h"
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +010024#include "mesh.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020025#include "wep.h"
26#include "wpa.h"
27#include "tkip.h"
28#include "wme.h"
29
Johannes Bergc6a1fa12008-10-07 12:04:32 +020030static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
31 struct tid_ampdu_rx *tid_agg_rx,
32 struct sk_buff *skb,
Vasanthakumar Thiagarajanb3631282009-03-25 18:10:18 +053033 struct ieee80211_rx_status *status,
Johannes Bergc6a1fa12008-10-07 12:04:32 +020034 u16 mpdu_seq_num,
35 int bar_req);
Johannes Bergb2e77712007-09-26 15:19:39 +020036/*
37 * monitor mode reception
38 *
39 * This function cleans up the SKB, i.e. it removes all the stuff
40 * only useful for monitoring.
41 */
42static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
43 struct sk_buff *skb,
44 int rtap_len)
45{
46 skb_pull(skb, rtap_len);
47
48 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
49 if (likely(skb->len > FCS_LEN))
50 skb_trim(skb, skb->len - FCS_LEN);
51 else {
52 /* driver bug */
53 WARN_ON(1);
54 dev_kfree_skb(skb);
55 skb = NULL;
56 }
57 }
58
59 return skb;
60}
61
62static inline int should_drop_frame(struct ieee80211_rx_status *status,
63 struct sk_buff *skb,
64 int present_fcs_len,
65 int radiotap_len)
66{
Harvey Harrison182503a2008-06-22 16:45:29 -070067 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Bergb2e77712007-09-26 15:19:39 +020068
69 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
70 return 1;
71 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
72 return 1;
Harvey Harrison87228f52008-06-11 14:21:59 -070073 if (ieee80211_is_ctl(hdr->frame_control) &&
74 !ieee80211_is_pspoll(hdr->frame_control) &&
75 !ieee80211_is_back_req(hdr->frame_control))
Johannes Bergb2e77712007-09-26 15:19:39 +020076 return 1;
77 return 0;
78}
79
Bruno Randolf601ae7f2008-05-08 19:22:43 +020080static int
81ieee80211_rx_radiotap_len(struct ieee80211_local *local,
82 struct ieee80211_rx_status *status)
83{
84 int len;
85
86 /* always present fields */
87 len = sizeof(struct ieee80211_radiotap_header) + 9;
88
89 if (status->flag & RX_FLAG_TSFT)
90 len += 8;
Johannes Berg7fee5372009-01-30 11:13:06 +010091 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
Bruno Randolf601ae7f2008-05-08 19:22:43 +020092 len += 1;
93 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
94 len += 1;
95
96 if (len & 1) /* padding for RX_FLAGS if necessary */
97 len++;
98
99 /* make sure radiotap starts at a naturally aligned address */
100 if (len % 8)
101 len = roundup(len, 8);
102
103 return len;
104}
105
Johannes Bergd1c3a372009-01-07 00:26:10 +0100106/*
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200107 * ieee80211_add_rx_radiotap_header - add radiotap header
108 *
109 * add a radiotap header containing all the fields which the hardware provided.
110 */
111static void
112ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
113 struct sk_buff *skb,
114 struct ieee80211_rx_status *status,
115 struct ieee80211_rate *rate,
116 int rtap_len)
117{
118 struct ieee80211_radiotap_header *rthdr;
119 unsigned char *pos;
120
121 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
122 memset(rthdr, 0, rtap_len);
123
124 /* radiotap header, set always present flags */
125 rthdr->it_present =
126 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200127 (1 << IEEE80211_RADIOTAP_CHANNEL) |
128 (1 << IEEE80211_RADIOTAP_ANTENNA) |
129 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
130 rthdr->it_len = cpu_to_le16(rtap_len);
131
132 pos = (unsigned char *)(rthdr+1);
133
134 /* the order of the following fields is important */
135
136 /* IEEE80211_RADIOTAP_TSFT */
137 if (status->flag & RX_FLAG_TSFT) {
138 *(__le64 *)pos = cpu_to_le64(status->mactime);
139 rthdr->it_present |=
140 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
141 pos += 8;
142 }
143
144 /* IEEE80211_RADIOTAP_FLAGS */
145 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
146 *pos |= IEEE80211_RADIOTAP_F_FCS;
Johannes Bergaae89832009-03-13 12:52:10 +0100147 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
148 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
Bruno Randolfb4f28bb2008-07-30 17:19:55 +0200149 if (status->flag & RX_FLAG_SHORTPRE)
150 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200151 pos++;
152
153 /* IEEE80211_RADIOTAP_RATE */
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200154 if (status->flag & RX_FLAG_HT) {
155 /*
156 * TODO: add following information into radiotap header once
157 * suitable fields are defined for it:
158 * - MCS index (status->rate_idx)
159 * - HT40 (status->flag & RX_FLAG_40MHZ)
160 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
161 */
162 *pos = 0;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200163 } else {
Jouni Malinenebe6c7b2009-01-10 11:47:33 +0200164 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200165 *pos = rate->bitrate / 5;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200166 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200167 pos++;
168
169 /* IEEE80211_RADIOTAP_CHANNEL */
170 *(__le16 *)pos = cpu_to_le16(status->freq);
171 pos += 2;
172 if (status->band == IEEE80211_BAND_5GHZ)
173 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
174 IEEE80211_CHAN_5GHZ);
Bruno Randolf9deb1ae2008-07-30 17:20:06 +0200175 else if (rate->flags & IEEE80211_RATE_ERP_G)
176 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
177 IEEE80211_CHAN_2GHZ);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200178 else
Bruno Randolf9deb1ae2008-07-30 17:20:06 +0200179 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK |
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200180 IEEE80211_CHAN_2GHZ);
181 pos += 2;
182
183 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
184 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
185 *pos = status->signal;
186 rthdr->it_present |=
187 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
188 pos++;
189 }
190
191 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
192 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
193 *pos = status->noise;
194 rthdr->it_present |=
195 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
196 pos++;
197 }
198
199 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
200
201 /* IEEE80211_RADIOTAP_ANTENNA */
202 *pos = status->antenna;
203 pos++;
204
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200205 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
206
207 /* IEEE80211_RADIOTAP_RX_FLAGS */
208 /* ensure 2 byte alignment for the 2 byte field as required */
209 if ((pos - (unsigned char *)rthdr) & 1)
210 pos++;
Johannes Bergaae89832009-03-13 12:52:10 +0100211 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
212 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADPLCP);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200213 pos += 2;
214}
215
Johannes Bergb2e77712007-09-26 15:19:39 +0200216/*
217 * This function copies a received frame to all monitor interfaces and
218 * returns a cleaned-up SKB that no longer includes the FCS nor the
219 * radiotap header the driver might have added.
220 */
221static struct sk_buff *
222ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
Johannes Berg8318d782008-01-24 19:38:38 +0100223 struct ieee80211_rx_status *status,
224 struct ieee80211_rate *rate)
Johannes Bergb2e77712007-09-26 15:19:39 +0200225{
226 struct ieee80211_sub_if_data *sdata;
Johannes Bergb2e77712007-09-26 15:19:39 +0200227 int needed_headroom = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200228 struct sk_buff *skb, *skb2;
229 struct net_device *prev_dev = NULL;
230 int present_fcs_len = 0;
231 int rtap_len = 0;
232
233 /*
234 * First, we may need to make a copy of the skb because
235 * (1) we need to modify it for radiotap (if not present), and
236 * (2) the other RX handlers will modify the skb we got.
237 *
238 * We don't need to, of course, if we aren't going to return
239 * the SKB because it has a bad FCS/PLCP checksum.
240 */
241 if (status->flag & RX_FLAG_RADIOTAP)
242 rtap_len = ieee80211_get_radiotap_len(origskb->data);
243 else
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200244 /* room for the radiotap header based on driver features */
245 needed_headroom = ieee80211_rx_radiotap_len(local, status);
Johannes Bergb2e77712007-09-26 15:19:39 +0200246
247 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
248 present_fcs_len = FCS_LEN;
249
250 if (!local->monitors) {
251 if (should_drop_frame(status, origskb, present_fcs_len,
252 rtap_len)) {
253 dev_kfree_skb(origskb);
254 return NULL;
255 }
256
257 return remove_monitor_info(local, origskb, rtap_len);
258 }
259
260 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
261 /* only need to expand headroom if necessary */
262 skb = origskb;
263 origskb = NULL;
264
265 /*
266 * This shouldn't trigger often because most devices have an
267 * RX header they pull before we get here, and that should
268 * be big enough for our radiotap information. We should
269 * probably export the length to drivers so that we can have
270 * them allocate enough headroom to start with.
271 */
272 if (skb_headroom(skb) < needed_headroom &&
Johannes Bergc49e5ea2007-12-11 21:33:42 +0100273 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200274 dev_kfree_skb(skb);
275 return NULL;
276 }
277 } else {
278 /*
279 * Need to make a copy and possibly remove radiotap header
280 * and FCS from the original.
281 */
282 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
283
284 origskb = remove_monitor_info(local, origskb, rtap_len);
285
286 if (!skb)
287 return origskb;
288 }
289
290 /* if necessary, prepend radiotap information */
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200291 if (!(status->flag & RX_FLAG_RADIOTAP))
292 ieee80211_add_rx_radiotap_header(local, skb, status, rate,
293 needed_headroom);
Johannes Bergb2e77712007-09-26 15:19:39 +0200294
Johannes Bergce3edf6d02007-12-19 01:31:22 +0100295 skb_reset_mac_header(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200296 skb->ip_summed = CHECKSUM_UNNECESSARY;
297 skb->pkt_type = PACKET_OTHERHOST;
298 skb->protocol = htons(ETH_P_802_2);
299
300 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
301 if (!netif_running(sdata->dev))
302 continue;
303
Johannes Berg05c914f2008-09-11 00:01:58 +0200304 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +0200305 continue;
306
Michael Wu3d30d942008-01-31 19:48:27 +0100307 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
308 continue;
309
Johannes Bergb2e77712007-09-26 15:19:39 +0200310 if (prev_dev) {
311 skb2 = skb_clone(skb, GFP_ATOMIC);
312 if (skb2) {
313 skb2->dev = prev_dev;
314 netif_rx(skb2);
315 }
316 }
317
318 prev_dev = sdata->dev;
319 sdata->dev->stats.rx_packets++;
320 sdata->dev->stats.rx_bytes += skb->len;
321 }
322
323 if (prev_dev) {
324 skb->dev = prev_dev;
325 netif_rx(skb);
326 } else
327 dev_kfree_skb(skb);
328
329 return origskb;
330}
331
332
Johannes Berg5cf121c2008-02-25 16:27:43 +0100333static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200334{
Harvey Harrison238f74a2008-07-02 11:05:34 -0700335 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200336 int tid;
337
338 /* does the frame have a qos control field? */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700339 if (ieee80211_is_data_qos(hdr->frame_control)) {
340 u8 *qc = ieee80211_get_qos_ctl(hdr);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200341 /* frame has qos control */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700342 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
343 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
Johannes Berg5cf121c2008-02-25 16:27:43 +0100344 rx->flags |= IEEE80211_RX_AMSDU;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +0200345 else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100346 rx->flags &= ~IEEE80211_RX_AMSDU;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200347 } else {
Johannes Berg1411f9b2008-07-10 10:11:02 +0200348 /*
349 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
350 *
351 * Sequence numbers for management frames, QoS data
352 * frames with a broadcast/multicast address in the
353 * Address 1 field, and all non-QoS data frames sent
354 * by QoS STAs are assigned using an additional single
355 * modulo-4096 counter, [...]
356 *
357 * We also use that counter for non-QoS STAs.
358 */
359 tid = NUM_RX_DATA_QUEUES - 1;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200360 }
Johannes Berg52865df2007-07-27 15:43:22 +0200361
Johannes Berg5cf121c2008-02-25 16:27:43 +0100362 rx->queue = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200363 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
364 * For now, set skb->priority to 0 for other cases. */
365 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100366}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200367
Johannes Bergd1c3a372009-01-07 00:26:10 +0100368/**
369 * DOC: Packet alignment
370 *
371 * Drivers always need to pass packets that are aligned to two-byte boundaries
372 * to the stack.
373 *
374 * Additionally, should, if possible, align the payload data in a way that
375 * guarantees that the contained IP header is aligned to a four-byte
376 * boundary. In the case of regular frames, this simply means aligning the
377 * payload to a four-byte boundary (because either the IP header is directly
378 * contained, or IV/RFC1042 headers that have a length divisible by four are
379 * in front of it).
380 *
381 * With A-MSDU frames, however, the payload data address must yield two modulo
382 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
383 * push the IP header further back to a multiple of four again. Thankfully, the
384 * specs were sane enough this time around to require padding each A-MSDU
385 * subframe to a length that is a multiple of four.
386 *
387 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
388 * the payload is not supported, the driver is required to move the 802.11
389 * header to be directly in front of the payload in that case.
390 */
391static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
Johannes Berg38f37142008-01-29 17:07:43 +0100392{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700393 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg38f37142008-01-29 17:07:43 +0100394 int hdrlen;
395
Johannes Bergd1c3a372009-01-07 00:26:10 +0100396#ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
397 return;
398#endif
399
400 if (WARN_ONCE((unsigned long)rx->skb->data & 1,
401 "unaligned packet at 0x%p\n", rx->skb->data))
402 return;
403
Harvey Harrisona7767f92008-07-02 16:30:51 -0700404 if (!ieee80211_is_data_present(hdr->frame_control))
Johannes Berg38f37142008-01-29 17:07:43 +0100405 return;
406
Harvey Harrisona7767f92008-07-02 16:30:51 -0700407 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg5cf121c2008-02-25 16:27:43 +0100408 if (rx->flags & IEEE80211_RX_AMSDU)
Johannes Berg38f37142008-01-29 17:07:43 +0100409 hdrlen += ETH_HLEN;
Johannes Bergd1c3a372009-01-07 00:26:10 +0100410 WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3,
411 "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200412}
413
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +0200414
Johannes Berg571ecf62007-07-27 15:43:22 +0200415/* rx handlers */
416
Johannes Berg49461622008-06-30 15:10:45 +0200417static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100418ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200419{
420 struct ieee80211_local *local = rx->local;
421 struct sk_buff *skb = rx->skb;
422
Johannes Bergc2b13452008-09-11 00:01:55 +0200423 if (unlikely(local->hw_scanning))
424 return ieee80211_scan_rx(rx->sdata, skb, rx->status);
Zhu Yiece8edd2007-11-22 10:53:21 +0800425
Johannes Bergc2b13452008-09-11 00:01:55 +0200426 if (unlikely(local->sw_scanning)) {
Zhu Yiece8edd2007-11-22 10:53:21 +0800427 /* drop all the other packets during a software scan anyway */
Johannes Bergc2b13452008-09-11 00:01:55 +0200428 if (ieee80211_scan_rx(rx->sdata, skb, rx->status)
Johannes Berg9ae54c82008-01-31 19:48:20 +0100429 != RX_QUEUED)
Zhu Yiece8edd2007-11-22 10:53:21 +0800430 dev_kfree_skb(skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100431 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200432 }
433
Johannes Berg5cf121c2008-02-25 16:27:43 +0100434 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200435 /* scanning finished during invoking of handlers */
436 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100437 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200438 }
439
Johannes Berg9ae54c82008-01-31 19:48:20 +0100440 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200441}
442
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200443
444static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
445{
446 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
447
448 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
449 return 0;
450
451 return ieee80211_is_robust_mgmt_frame(hdr);
452}
453
454
455static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
456{
457 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
458
459 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
460 return 0;
461
462 return ieee80211_is_robust_mgmt_frame(hdr);
463}
464
465
466/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
467static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
468{
469 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
470 struct ieee80211_mmie *mmie;
471
472 if (skb->len < 24 + sizeof(*mmie) ||
473 !is_multicast_ether_addr(hdr->da))
474 return -1;
475
476 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
477 return -1; /* not a robust management frame */
478
479 mmie = (struct ieee80211_mmie *)
480 (skb->data + skb->len - sizeof(*mmie));
481 if (mmie->element_id != WLAN_EID_MMIE ||
482 mmie->length != sizeof(*mmie) - 2)
483 return -1;
484
485 return le16_to_cpu(mmie->key_id);
486}
487
488
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100489static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100490ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100491{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700492 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
493 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100494
Harvey Harrisona7767f92008-07-02 16:30:51 -0700495 if (ieee80211_is_data(hdr->frame_control)) {
496 if (!ieee80211_has_a4(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100497 return RX_DROP_MONITOR;
498 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
499 return RX_DROP_MONITOR;
500 }
501
502 /* If there is not an established peer link and this is not a peer link
503 * establisment frame, beacon or probe, drop the frame.
504 */
505
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800506 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100507 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100508
Harvey Harrisona7767f92008-07-02 16:30:51 -0700509 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100510 return RX_DROP_MONITOR;
511
Harvey Harrisona7767f92008-07-02 16:30:51 -0700512 if (ieee80211_is_action(hdr->frame_control)) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100513 mgmt = (struct ieee80211_mgmt *)hdr;
514 if (mgmt->u.action.category != PLINK_CATEGORY)
515 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100516 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100517 }
518
Harvey Harrisona7767f92008-07-02 16:30:51 -0700519 if (ieee80211_is_probe_req(hdr->frame_control) ||
520 ieee80211_is_probe_resp(hdr->frame_control) ||
521 ieee80211_is_beacon(hdr->frame_control))
522 return RX_CONTINUE;
523
524 return RX_DROP_MONITOR;
525
526 }
527
528#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
529
530 if (ieee80211_is_data(hdr->frame_control) &&
531 is_multicast_ether_addr(hdr->addr1) &&
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200532 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100533 return RX_DROP_MONITOR;
Johannes Berg902acc72008-02-23 15:17:19 +0100534#undef msh_h_get
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100535
Johannes Berg902acc72008-02-23 15:17:19 +0100536 return RX_CONTINUE;
537}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100538
539
Johannes Berg49461622008-06-30 15:10:45 +0200540static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100541ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200542{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700543 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +0200544
545 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
546 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700547 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100548 rx->sta->last_seq_ctrl[rx->queue] ==
Johannes Berg571ecf62007-07-27 15:43:22 +0200549 hdr->seq_ctrl)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +0100550 if (rx->flags & IEEE80211_RX_RA_MATCH) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200551 rx->local->dot11FrameDuplicateCount++;
552 rx->sta->num_duplicates++;
553 }
Johannes Berge4c26ad2008-01-31 19:48:21 +0100554 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200555 } else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100556 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +0200557 }
558
Johannes Berg571ecf62007-07-27 15:43:22 +0200559 if (unlikely(rx->skb->len < 16)) {
560 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100561 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200562 }
563
Johannes Berg571ecf62007-07-27 15:43:22 +0200564 /* Drop disallowed frame classes based on STA auth/assoc state;
565 * IEEE 802.11, Chap 5.5.
566 *
Johannes Bergccd7b362008-09-11 00:01:56 +0200567 * mac80211 filters only based on association state, i.e. it drops
568 * Class 3 frames from not associated stations. hostapd sends
Johannes Berg571ecf62007-07-27 15:43:22 +0200569 * deauth/disassoc frames when needed. In addition, hostapd is
570 * responsible for filtering on both auth and assoc states.
571 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100572
Johannes Berg902acc72008-02-23 15:17:19 +0100573 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100574 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100575
Harvey Harrisona7767f92008-07-02 16:30:51 -0700576 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
577 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200578 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Johannes Berg07346f812008-05-03 01:02:02 +0200579 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700580 if ((!ieee80211_has_fromds(hdr->frame_control) &&
581 !ieee80211_has_tods(hdr->frame_control) &&
582 ieee80211_is_data(hdr->frame_control)) ||
583 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200584 /* Drop IBSS frames and frames for other hosts
585 * silently. */
Johannes Berge4c26ad2008-01-31 19:48:21 +0100586 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200587 }
588
Johannes Berge4c26ad2008-01-31 19:48:21 +0100589 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200590 }
591
Johannes Berg9ae54c82008-01-31 19:48:20 +0100592 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +0200593}
594
595
Johannes Berg49461622008-06-30 15:10:45 +0200596static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100597ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
Johannes Berg570bd532007-07-27 15:43:22 +0200598{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700599 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg3017b802007-08-28 17:01:53 -0400600 int keyidx;
601 int hdrlen;
Johannes Berge4c26ad2008-01-31 19:48:21 +0100602 ieee80211_rx_result result = RX_DROP_UNUSABLE;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400603 struct ieee80211_key *stakey = NULL;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200604 int mmie_keyidx = -1;
Johannes Berg570bd532007-07-27 15:43:22 +0200605
Johannes Berg3017b802007-08-28 17:01:53 -0400606 /*
607 * Key selection 101
608 *
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200609 * There are four types of keys:
Johannes Berg3017b802007-08-28 17:01:53 -0400610 * - GTK (group keys)
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200611 * - IGTK (group keys for management frames)
Johannes Berg3017b802007-08-28 17:01:53 -0400612 * - PTK (pairwise keys)
613 * - STK (station-to-station pairwise keys)
614 *
615 * When selecting a key, we have to distinguish between multicast
616 * (including broadcast) and unicast frames, the latter can only
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200617 * use PTKs and STKs while the former always use GTKs and IGTKs.
618 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
619 * unicast frames can also use key indices like GTKs. Hence, if we
620 * don't have a PTK/STK we check the key index for a WEP key.
Johannes Berg3017b802007-08-28 17:01:53 -0400621 *
Johannes Berg8dc06a12007-08-28 17:01:55 -0400622 * Note that in a regular BSS, multicast frames are sent by the
623 * AP only, associated stations unicast the frame to the AP first
624 * which then multicasts it on their behalf.
625 *
Johannes Berg3017b802007-08-28 17:01:53 -0400626 * There is also a slight problem in IBSS mode: GTKs are negotiated
627 * with each station, that is something we don't currently handle.
Johannes Berg8dc06a12007-08-28 17:01:55 -0400628 * The spec seems to expect that one negotiates the same key with
629 * every station but there's no such requirement; VLANs could be
630 * possible.
Johannes Berg3017b802007-08-28 17:01:53 -0400631 */
Johannes Berg571ecf62007-07-27 15:43:22 +0200632
Johannes Berg3017b802007-08-28 17:01:53 -0400633 /*
Johannes Berg1990af82007-09-26 17:53:15 +0200634 * No point in finding a key and decrypting if the frame is neither
Johannes Berg3017b802007-08-28 17:01:53 -0400635 * addressed to us nor a multicast frame.
636 */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100637 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100638 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -0400639
Johannes Bergd4e46a32007-09-14 11:10:24 -0400640 if (rx->sta)
641 stakey = rcu_dereference(rx->sta->key);
642
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300643 if (!ieee80211_has_protected(hdr->frame_control))
644 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
645
Johannes Bergd4e46a32007-09-14 11:10:24 -0400646 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
647 rx->key = stakey;
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300648 /* Skip decryption if the frame is not protected. */
649 if (!ieee80211_has_protected(hdr->frame_control))
650 return RX_CONTINUE;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200651 } else if (mmie_keyidx >= 0) {
652 /* Broadcast/multicast robust management frame / BIP */
653 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
654 (rx->status->flag & RX_FLAG_IV_STRIPPED))
655 return RX_CONTINUE;
656
657 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
658 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
659 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
660 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300661 } else if (!ieee80211_has_protected(hdr->frame_control)) {
662 /*
663 * The frame was not protected, so skip decryption. However, we
664 * need to set rx->key if there is a key that could have been
665 * used so that the frame may be dropped if encryption would
666 * have been expected.
667 */
668 struct ieee80211_key *key = NULL;
669 if (ieee80211_is_mgmt(hdr->frame_control) &&
670 is_multicast_ether_addr(hdr->addr1) &&
671 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
672 rx->key = key;
673 else if ((key = rcu_dereference(rx->sdata->default_key)))
674 rx->key = key;
675 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200676 } else {
Johannes Berg3017b802007-08-28 17:01:53 -0400677 /*
678 * The device doesn't give us the IV so we won't be
679 * able to look up the key. That's ok though, we
680 * don't need to decrypt the frame, we just won't
681 * be able to keep statistics accurate.
682 * Except for key threshold notifications, should
683 * we somehow allow the driver to tell us which key
684 * the hardware used if this flag is set?
685 */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100686 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
687 (rx->status->flag & RX_FLAG_IV_STRIPPED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100688 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200689
Harvey Harrisona7767f92008-07-02 16:30:51 -0700690 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +0200691
Johannes Berg3017b802007-08-28 17:01:53 -0400692 if (rx->skb->len < 8 + hdrlen)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100693 return RX_DROP_UNUSABLE; /* TODO: count this? */
Johannes Berg571ecf62007-07-27 15:43:22 +0200694
Johannes Berg3017b802007-08-28 17:01:53 -0400695 /*
696 * no need to call ieee80211_wep_get_keyidx,
697 * it verifies a bunch of things we've done already
698 */
699 keyidx = rx->skb->data[hdrlen + 3] >> 6;
700
Johannes Bergd4e46a32007-09-14 11:10:24 -0400701 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
Johannes Berg3017b802007-08-28 17:01:53 -0400702
703 /*
704 * RSNA-protected unicast frames should always be sent with
705 * pairwise or station-to-station keys, but for WEP we allow
706 * using a key index as well.
707 */
Johannes Berg8f20fc22007-08-28 17:01:54 -0400708 if (rx->key && rx->key->conf.alg != ALG_WEP &&
Johannes Berg3017b802007-08-28 17:01:53 -0400709 !is_multicast_ether_addr(hdr->addr1))
710 rx->key = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +0200711 }
712
Johannes Berg3017b802007-08-28 17:01:53 -0400713 if (rx->key) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200714 rx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -0400715 /* TODO: add threshold stuff again */
Johannes Berg1990af82007-09-26 17:53:15 +0200716 } else {
Johannes Berge4c26ad2008-01-31 19:48:21 +0100717 return RX_DROP_MONITOR;
Johannes Berg70f08762007-09-26 17:53:14 +0200718 }
719
Johannes Berg1990af82007-09-26 17:53:15 +0200720 /* Check for weak IVs if possible */
721 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
Harvey Harrisona7767f92008-07-02 16:30:51 -0700722 ieee80211_is_data(hdr->frame_control) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100723 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
724 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
Johannes Berg1990af82007-09-26 17:53:15 +0200725 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
726 rx->sta->wep_weak_iv_count++;
727
Johannes Berg70f08762007-09-26 17:53:14 +0200728 switch (rx->key->conf.alg) {
729 case ALG_WEP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200730 result = ieee80211_crypto_wep_decrypt(rx);
731 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200732 case ALG_TKIP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200733 result = ieee80211_crypto_tkip_decrypt(rx);
734 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200735 case ALG_CCMP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200736 result = ieee80211_crypto_ccmp_decrypt(rx);
737 break;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200738 case ALG_AES_CMAC:
739 result = ieee80211_crypto_aes_cmac_decrypt(rx);
740 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200741 }
742
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200743 /* either the frame has been decrypted or will be dropped */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100744 rx->status->flag |= RX_FLAG_DECRYPTED;
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200745
746 return result;
Johannes Berg70f08762007-09-26 17:53:14 +0200747}
748
Kalle Valo572e0012009-02-10 17:09:31 +0200749static ieee80211_rx_result debug_noinline
750ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
751{
752 struct ieee80211_local *local;
753 struct ieee80211_hdr *hdr;
754 struct sk_buff *skb;
755
756 local = rx->local;
757 skb = rx->skb;
758 hdr = (struct ieee80211_hdr *) skb->data;
759
760 if (!local->pspolling)
761 return RX_CONTINUE;
762
763 if (!ieee80211_has_fromds(hdr->frame_control))
764 /* this is not from AP */
765 return RX_CONTINUE;
766
767 if (!ieee80211_is_data(hdr->frame_control))
768 return RX_CONTINUE;
769
770 if (!ieee80211_has_moredata(hdr->frame_control)) {
771 /* AP has no more frames buffered for us */
772 local->pspolling = false;
773 return RX_CONTINUE;
774 }
775
776 /* more data bit is set, let's request a new frame from the AP */
777 ieee80211_send_pspoll(local, rx->sdata);
778
779 return RX_CONTINUE;
780}
781
Johannes Berg133b8222008-09-16 14:18:59 +0200782static void ap_sta_ps_start(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +0200783{
Johannes Berg133b8222008-09-16 14:18:59 +0200784 struct ieee80211_sub_if_data *sdata = sta->sdata;
Christian Lamparter4571d3b2008-11-30 00:48:41 +0100785 struct ieee80211_local *local = sdata->local;
Joe Perches0795af52007-10-03 17:59:30 -0700786
Johannes Berg3e122be2008-07-09 14:40:34 +0200787 atomic_inc(&sdata->bss->num_sta_ps);
Johannes Berg07346f812008-05-03 01:02:02 +0200788 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
Johannes Berg24487982009-04-23 18:52:52 +0200789 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta);
Johannes Berg571ecf62007-07-27 15:43:22 +0200790#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700791 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
792 sdata->dev->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200793#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
794}
795
Johannes Berg133b8222008-09-16 14:18:59 +0200796static int ap_sta_ps_end(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +0200797{
Johannes Berg133b8222008-09-16 14:18:59 +0200798 struct ieee80211_sub_if_data *sdata = sta->sdata;
799 struct ieee80211_local *local = sdata->local;
Johannes Berg571ecf62007-07-27 15:43:22 +0200800 struct sk_buff *skb;
801 int sent = 0;
Johannes Berg571ecf62007-07-27 15:43:22 +0200802
Johannes Berg3e122be2008-07-09 14:40:34 +0200803 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg004c8722008-02-20 11:21:35 +0100804
Johannes Berg07346f812008-05-03 01:02:02 +0200805 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
Johannes Berg24487982009-04-23 18:52:52 +0200806 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta);
Johannes Berg004c8722008-02-20 11:21:35 +0100807
808 if (!skb_queue_empty(&sta->ps_tx_buf))
809 sta_info_clear_tim_bit(sta);
810
Johannes Berg571ecf62007-07-27 15:43:22 +0200811#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700812 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
813 sdata->dev->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200814#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg004c8722008-02-20 11:21:35 +0100815
Johannes Berg571ecf62007-07-27 15:43:22 +0200816 /* Send all buffered frames to the station */
817 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200818 sent++;
Sujith8b30b1f2008-10-24 09:55:27 +0530819 skb->requeue = 1;
Johannes Berg571ecf62007-07-27 15:43:22 +0200820 dev_queue_xmit(skb);
821 }
822 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200823 local->total_ps_buffered--;
824 sent++;
825#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700826 printk(KERN_DEBUG "%s: STA %pM aid %d send PS frame "
Johannes Berg133b8222008-09-16 14:18:59 +0200827 "since STA not sleeping anymore\n", sdata->dev->name,
Johannes Berg0c68ae262008-10-27 15:56:10 -0700828 sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200829#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Sujith8b30b1f2008-10-24 09:55:27 +0530830 skb->requeue = 1;
Johannes Berg571ecf62007-07-27 15:43:22 +0200831 dev_queue_xmit(skb);
832 }
833
834 return sent;
835}
836
Johannes Berg49461622008-06-30 15:10:45 +0200837static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100838ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200839{
840 struct sta_info *sta = rx->sta;
Harvey Harrisona7767f92008-07-02 16:30:51 -0700841 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +0200842
843 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +0100844 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200845
846 /* Update last_rx only for IBSS packets which are for the current
847 * BSSID to avoid keeping the current IBSS network alive in cases where
848 * other STAs are using different BSSID. */
Johannes Berg05c914f2008-09-11 00:01:58 +0200849 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +0200850 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +0200851 NL80211_IFTYPE_ADHOC);
Johannes Berg46900292009-02-15 12:44:28 +0100852 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
Johannes Berg571ecf62007-07-27 15:43:22 +0200853 sta->last_rx = jiffies;
854 } else
855 if (!is_multicast_ether_addr(hdr->addr1) ||
Johannes Berg05c914f2008-09-11 00:01:58 +0200856 rx->sdata->vif.type == NL80211_IFTYPE_STATION) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200857 /* Update last_rx only for unicast frames in order to prevent
858 * the Probe Request frames (the only broadcast frames from a
859 * STA in infrastructure mode) from keeping a connection alive.
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100860 * Mesh beacons will update last_rx when if they are found to
861 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +0200862 */
Kalle Valo15b7b062009-03-22 21:57:14 +0200863 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
864 ieee80211_is_beacon(hdr->frame_control)) {
865 rx->sdata->u.mgd.last_beacon = jiffies;
866 } else
867 sta->last_rx = jiffies;
Johannes Berg571ecf62007-07-27 15:43:22 +0200868 }
869
Johannes Berg5cf121c2008-02-25 16:27:43 +0100870 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100871 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200872
Kalle Valo3cf335d2009-03-22 21:57:06 +0200873 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
874 ieee80211_sta_rx_notify(rx->sdata, hdr);
875
Johannes Berg571ecf62007-07-27 15:43:22 +0200876 sta->rx_fragments++;
877 sta->rx_bytes += rx->skb->len;
Johannes Berg5cf121c2008-02-25 16:27:43 +0100878 sta->last_signal = rx->status->signal;
Bruno Randolf566bfe52008-05-08 19:15:40 +0200879 sta->last_qual = rx->status->qual;
Johannes Berg5cf121c2008-02-25 16:27:43 +0100880 sta->last_noise = rx->status->noise;
Johannes Berg571ecf62007-07-27 15:43:22 +0200881
Johannes Berg72eaa432008-11-26 15:02:58 +0100882 /*
883 * Change STA power saving mode only at the end of a frame
884 * exchange sequence.
885 */
Johannes Berg3e122be2008-07-09 14:40:34 +0200886 if (!ieee80211_has_morefrags(hdr->frame_control) &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200887 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
888 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
Johannes Berg72eaa432008-11-26 15:02:58 +0100889 if (test_sta_flags(sta, WLAN_STA_PS)) {
890 /*
891 * Ignore doze->wake transitions that are
892 * indicated by non-data frames, the standard
893 * is unclear here, but for example going to
894 * PS mode and then scanning would cause a
895 * doze->wake transition for the probe request,
896 * and that is clearly undesirable.
897 */
898 if (ieee80211_is_data(hdr->frame_control) &&
899 !ieee80211_has_pm(hdr->frame_control))
900 rx->sent_ps_buffered += ap_sta_ps_end(sta);
901 } else {
902 if (ieee80211_has_pm(hdr->frame_control))
903 ap_sta_ps_start(sta);
904 }
Johannes Berg571ecf62007-07-27 15:43:22 +0200905 }
906
907 /* Drop data::nullfunc frames silently, since they are used only to
908 * control station power saving mode. */
Harvey Harrisona7767f92008-07-02 16:30:51 -0700909 if (ieee80211_is_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200910 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
911 /* Update counter and free packet here to avoid counting this
912 * as a dropped packed. */
913 sta->rx_packets++;
914 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100915 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200916 }
917
Johannes Berg9ae54c82008-01-31 19:48:20 +0100918 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200919} /* ieee80211_rx_h_sta_process */
920
Johannes Berg571ecf62007-07-27 15:43:22 +0200921static inline struct ieee80211_fragment_entry *
922ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
923 unsigned int frag, unsigned int seq, int rx_queue,
924 struct sk_buff **skb)
925{
926 struct ieee80211_fragment_entry *entry;
927 int idx;
928
929 idx = sdata->fragment_next;
930 entry = &sdata->fragments[sdata->fragment_next++];
931 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
932 sdata->fragment_next = 0;
933
934 if (!skb_queue_empty(&entry->skb_list)) {
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200935#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg571ecf62007-07-27 15:43:22 +0200936 struct ieee80211_hdr *hdr =
937 (struct ieee80211_hdr *) entry->skb_list.next->data;
938 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
939 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
Johannes Berg0c68ae262008-10-27 15:56:10 -0700940 "addr1=%pM addr2=%pM\n",
Johannes Berg571ecf62007-07-27 15:43:22 +0200941 sdata->dev->name, idx,
942 jiffies - entry->first_frag_time, entry->seq,
Johannes Berg0c68ae262008-10-27 15:56:10 -0700943 entry->last_frag, hdr->addr1, hdr->addr2);
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200944#endif
Johannes Berg571ecf62007-07-27 15:43:22 +0200945 __skb_queue_purge(&entry->skb_list);
946 }
947
948 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
949 *skb = NULL;
950 entry->first_frag_time = jiffies;
951 entry->seq = seq;
952 entry->rx_queue = rx_queue;
953 entry->last_frag = frag;
954 entry->ccmp = 0;
955 entry->extra_len = 0;
956
957 return entry;
958}
959
960static inline struct ieee80211_fragment_entry *
961ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700962 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +0200963 int rx_queue, struct ieee80211_hdr *hdr)
964{
965 struct ieee80211_fragment_entry *entry;
966 int i, idx;
967
968 idx = sdata->fragment_next;
969 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
970 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +0200971
972 idx--;
973 if (idx < 0)
974 idx = IEEE80211_FRAGMENT_MAX - 1;
975
976 entry = &sdata->fragments[idx];
977 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
978 entry->rx_queue != rx_queue ||
979 entry->last_frag + 1 != frag)
980 continue;
981
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700982 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +0200983
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700984 /*
985 * Check ftype and addresses are equal, else check next fragment
986 */
987 if (((hdr->frame_control ^ f_hdr->frame_control) &
988 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Johannes Berg571ecf62007-07-27 15:43:22 +0200989 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
990 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
991 continue;
992
S.Çağlar Onurab466232008-02-14 17:36:47 +0200993 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200994 __skb_queue_purge(&entry->skb_list);
995 continue;
996 }
997 return entry;
998 }
999
1000 return NULL;
1001}
1002
Johannes Berg49461622008-06-30 15:10:45 +02001003static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001004ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001005{
1006 struct ieee80211_hdr *hdr;
1007 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001008 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001009 unsigned int frag, seq;
1010 struct ieee80211_fragment_entry *entry;
1011 struct sk_buff *skb;
1012
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001013 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001014 fc = hdr->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02001015 sc = le16_to_cpu(hdr->seq_ctrl);
1016 frag = sc & IEEE80211_SCTL_FRAG;
1017
Harvey Harrison358c8d92008-07-15 18:44:13 -07001018 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001019 (rx->skb)->len < 24 ||
1020 is_multicast_ether_addr(hdr->addr1))) {
1021 /* not fragmented */
1022 goto out;
1023 }
1024 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1025
1026 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1027
1028 if (frag == 0) {
1029 /* This is the first fragment of a new frame. */
1030 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001031 rx->queue, &(rx->skb));
Johannes Berg8f20fc22007-08-28 17:01:54 -04001032 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
Harvey Harrison358c8d92008-07-15 18:44:13 -07001033 ieee80211_has_protected(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001034 /* Store CCMP PN so that we can verify that the next
1035 * fragment has a sequential PN value. */
1036 entry->ccmp = 1;
1037 memcpy(entry->last_pn,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001038 rx->key->u.ccmp.rx_pn[rx->queue],
Johannes Berg571ecf62007-07-27 15:43:22 +02001039 CCMP_PN_LEN);
1040 }
Johannes Berg9ae54c82008-01-31 19:48:20 +01001041 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001042 }
1043
1044 /* This is a fragment for a frame that should already be pending in
1045 * fragment cache. Add this fragment to the end of the pending entry.
1046 */
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001047 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001048 if (!entry) {
1049 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001050 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001051 }
1052
1053 /* Verify that MPDUs within one MSDU have sequential PN values.
1054 * (IEEE 802.11i, 8.3.3.4.5) */
1055 if (entry->ccmp) {
1056 int i;
1057 u8 pn[CCMP_PN_LEN], *rpn;
Johannes Berg8f20fc22007-08-28 17:01:54 -04001058 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001059 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001060 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1061 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1062 pn[i]++;
1063 if (pn[i])
1064 break;
1065 }
Johannes Berg5cf121c2008-02-25 16:27:43 +01001066 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001067 if (memcmp(pn, rpn, CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001068 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001069 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1070 }
1071
Harvey Harrison358c8d92008-07-15 18:44:13 -07001072 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +02001073 __skb_queue_tail(&entry->skb_list, rx->skb);
1074 entry->last_frag = frag;
1075 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001076 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001077 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001078 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001079 }
1080
1081 rx->skb = __skb_dequeue(&entry->skb_list);
1082 if (skb_tailroom(rx->skb) < entry->extra_len) {
1083 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1084 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1085 GFP_ATOMIC))) {
1086 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1087 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001088 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001089 }
1090 }
1091 while ((skb = __skb_dequeue(&entry->skb_list))) {
1092 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1093 dev_kfree_skb(skb);
1094 }
1095
1096 /* Complete frame has been reassembled - process it now */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001097 rx->flags |= IEEE80211_RX_FRAGMENTED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001098
1099 out:
1100 if (rx->sta)
1101 rx->sta->rx_packets++;
1102 if (is_multicast_ether_addr(hdr->addr1))
1103 rx->local->dot11MulticastReceivedFrameCount++;
1104 else
1105 ieee80211_led_rx(rx->local);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001106 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001107}
1108
Johannes Berg49461622008-06-30 15:10:45 +02001109static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001110ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001111{
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +02001112 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
Johannes Berg571ecf62007-07-27 15:43:22 +02001113 struct sk_buff *skb;
1114 int no_pending_pkts;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001115 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02001116
Harvey Harrison358c8d92008-07-15 18:44:13 -07001117 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
Johannes Berg5cf121c2008-02-25 16:27:43 +01001118 !(rx->flags & IEEE80211_RX_RA_MATCH)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001119 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001120
Johannes Berg05c914f2008-09-11 00:01:58 +02001121 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1122 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001123 return RX_DROP_UNUSABLE;
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +02001124
Johannes Berg571ecf62007-07-27 15:43:22 +02001125 skb = skb_dequeue(&rx->sta->tx_filtered);
1126 if (!skb) {
1127 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1128 if (skb)
1129 rx->local->total_ps_buffered--;
1130 }
1131 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1132 skb_queue_empty(&rx->sta->ps_tx_buf);
1133
1134 if (skb) {
1135 struct ieee80211_hdr *hdr =
1136 (struct ieee80211_hdr *) skb->data;
1137
Johannes Berg4a9a66e2008-02-19 11:31:14 +01001138 /*
1139 * Tell TX path to send one frame even though the STA may
1140 * still remain is PS mode after this frame exchange.
1141 */
Johannes Berg07346f812008-05-03 01:02:02 +02001142 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
Johannes Berg571ecf62007-07-27 15:43:22 +02001143
1144#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001145 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1146 rx->sta->sta.addr, rx->sta->sta.aid,
Johannes Berg571ecf62007-07-27 15:43:22 +02001147 skb_queue_len(&rx->sta->ps_tx_buf));
1148#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1149
1150 /* Use MoreData flag to indicate whether there are more
1151 * buffered frames for this STA */
Johannes Berg836341a2008-02-20 02:07:21 +01001152 if (no_pending_pkts)
Johannes Berg571ecf62007-07-27 15:43:22 +02001153 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
Johannes Berg836341a2008-02-20 02:07:21 +01001154 else
Johannes Berg571ecf62007-07-27 15:43:22 +02001155 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1156
1157 dev_queue_xmit(skb);
1158
Johannes Berg004c8722008-02-20 11:21:35 +01001159 if (no_pending_pkts)
1160 sta_info_clear_tim_bit(rx->sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001161#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg5cf121c2008-02-25 16:27:43 +01001162 } else if (!rx->sent_ps_buffered) {
Johannes Berg004c8722008-02-20 11:21:35 +01001163 /*
1164 * FIXME: This can be the result of a race condition between
1165 * us expiring a frame and the station polling for it.
1166 * Should we send it a null-func frame indicating we
1167 * have nothing buffered for it?
1168 */
Johannes Berg0c68ae262008-10-27 15:56:10 -07001169 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001170 "though there are no buffered frames for it\n",
Johannes Berg0c68ae262008-10-27 15:56:10 -07001171 rx->dev->name, rx->sta->sta.addr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001172#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg571ecf62007-07-27 15:43:22 +02001173 }
1174
Johannes Berg9ae54c82008-01-31 19:48:20 +01001175 /* Free PS Poll skb here instead of returning RX_DROP that would
Johannes Berg571ecf62007-07-27 15:43:22 +02001176 * count as an dropped frame. */
1177 dev_kfree_skb(rx->skb);
1178
Johannes Berg9ae54c82008-01-31 19:48:20 +01001179 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001180}
1181
Johannes Berg49461622008-06-30 15:10:45 +02001182static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001183ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +02001184{
Johannes Berg6e0d1142007-07-27 15:43:22 +02001185 u8 *data = rx->skb->data;
Harvey Harrison238f74a2008-07-02 11:05:34 -07001186 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001187
Harvey Harrison238f74a2008-07-02 11:05:34 -07001188 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001189 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001190
1191 /* remove the qos control field, update frame type and meta-data */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001192 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1193 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1194 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001195 /* change frame type to non QOS */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001196 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001197
Johannes Berg9ae54c82008-01-31 19:48:20 +01001198 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001199}
1200
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001201static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001202ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001203{
Johannes Berg07346f812008-05-03 01:02:02 +02001204 if (unlikely(!rx->sta ||
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001205 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001206 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001207
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001208 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001209}
1210
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001211static int
Harvey Harrison358c8d92008-07-15 18:44:13 -07001212ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02001213{
Johannes Berg3017b802007-08-28 17:01:53 -04001214 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001215 * Pass through unencrypted frames if the hardware has
1216 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001217 */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001218 if (rx->status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001219 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001220
1221 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001222 if (unlikely(!ieee80211_has_protected(fc) &&
1223 !ieee80211_is_nullfunc(fc) &&
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001224 ieee80211_is_data(fc) &&
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +02001225 (rx->key || rx->sdata->drop_unencrypted)))
1226 return -EACCES;
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001227 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1228 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1229 rx->key))
1230 return -EACCES;
1231 /* BIP does not use Protected field, so need to check MMIE */
1232 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb)
1233 && ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1234 rx->key))
1235 return -EACCES;
1236 /*
1237 * When using MFP, Action frames are not allowed prior to
1238 * having configured keys.
1239 */
1240 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1241 ieee80211_is_robust_mgmt_frame(
1242 (struct ieee80211_hdr *) rx->skb->data)))
1243 return -EACCES;
1244 }
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001245
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001246 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001247}
1248
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001249static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001250ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001251{
1252 struct net_device *dev = rx->dev;
Johannes Berg571ecf62007-07-27 15:43:22 +02001253 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001254 u16 hdrlen, ethertype;
Johannes Berg571ecf62007-07-27 15:43:22 +02001255 u8 *payload;
1256 u8 dst[ETH_ALEN];
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301257 u8 src[ETH_ALEN] __aligned(2);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001258 struct sk_buff *skb = rx->skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001259 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1260
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001261 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001262 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001263
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001264 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +02001265
1266 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1267 * header
1268 * IEEE 802.11 address fields:
1269 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1270 * 0 0 DA SA BSSID n/a
1271 * 0 1 DA BSSID SA n/a
1272 * 1 0 BSSID SA DA n/a
1273 * 1 1 RA TA DA SA
1274 */
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001275 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
1276 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
Johannes Berg571ecf62007-07-27 15:43:22 +02001277
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001278 switch (hdr->frame_control &
1279 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
Harvey Harrisonc1b4aa32009-01-29 13:26:44 -08001280 case cpu_to_le16(IEEE80211_FCTL_TODS):
Johannes Berg05c914f2008-09-11 00:01:58 +02001281 if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP &&
1282 sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001283 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001284 break;
Harvey Harrisonc1b4aa32009-01-29 13:26:44 -08001285 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
Johannes Berg05c914f2008-09-11 00:01:58 +02001286 if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS &&
1287 sdata->vif.type != NL80211_IFTYPE_MESH_POINT))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001288 return -1;
YanBo79617de2008-09-22 13:30:32 +08001289 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1290 struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *)
1291 (skb->data + hdrlen);
1292 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
1293 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
1294 memcpy(dst, meshdr->eaddr1, ETH_ALEN);
1295 memcpy(src, meshdr->eaddr2, ETH_ALEN);
1296 }
1297 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001298 break;
Harvey Harrisonc1b4aa32009-01-29 13:26:44 -08001299 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
Johannes Berg05c914f2008-09-11 00:01:58 +02001300 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
John W. Linvilleb3316152007-08-28 17:01:55 -04001301 (is_multicast_ether_addr(dst) &&
1302 !compare_ether_addr(src, dev->dev_addr)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001303 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001304 break;
Harvey Harrisonc1b4aa32009-01-29 13:26:44 -08001305 case cpu_to_le16(0):
Johannes Berg05c914f2008-09-11 00:01:58 +02001306 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001307 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001308 break;
1309 }
1310
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001311 if (unlikely(skb->len - hdrlen < 8))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001312 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001313
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001314 payload = skb->data + hdrlen;
Johannes Berg571ecf62007-07-27 15:43:22 +02001315 ethertype = (payload[6] << 8) | payload[7];
1316
1317 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1318 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1319 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1320 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1321 * replace EtherType */
1322 skb_pull(skb, hdrlen + 6);
1323 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1324 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1325 } else {
1326 struct ethhdr *ehdr;
1327 __be16 len;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001328
Johannes Berg571ecf62007-07-27 15:43:22 +02001329 skb_pull(skb, hdrlen);
1330 len = htons(skb->len);
1331 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1332 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1333 memcpy(ehdr->h_source, src, ETH_ALEN);
1334 ehdr->h_proto = len;
1335 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001336 return 0;
1337}
Johannes Berg571ecf62007-07-27 15:43:22 +02001338
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001339/*
1340 * requires that rx->skb is a frame with ethernet header
1341 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001342static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001343{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301344 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001345 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1346 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1347
1348 /*
1349 * Allow EAPOL frames to us/the PAE group address regardless
1350 * of whether the frame was encrypted or not.
1351 */
1352 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1353 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1354 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1355 return true;
1356
1357 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07001358 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001359 return false;
1360
1361 return true;
1362}
1363
1364/*
1365 * requires that rx->skb is a frame with ethernet header
1366 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001367static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01001368ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001369{
1370 struct net_device *dev = rx->dev;
1371 struct ieee80211_local *local = rx->local;
1372 struct sk_buff *skb, *xmit_skb;
1373 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001374 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1375 struct sta_info *dsta;
Johannes Berg571ecf62007-07-27 15:43:22 +02001376
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001377 skb = rx->skb;
1378 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001379
Johannes Berg05c914f2008-09-11 00:01:58 +02001380 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1381 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02001382 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +01001383 (rx->flags & IEEE80211_RX_RA_MATCH)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001384 if (is_multicast_ether_addr(ehdr->h_dest)) {
1385 /*
1386 * send multicast frames both to higher layers in
1387 * local net stack and back to the wireless medium
1388 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001389 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1390 if (!xmit_skb && net_ratelimit())
Johannes Berg571ecf62007-07-27 15:43:22 +02001391 printk(KERN_DEBUG "%s: failed to clone "
1392 "multicast frame\n", dev->name);
1393 } else {
Johannes Berg571ecf62007-07-27 15:43:22 +02001394 dsta = sta_info_get(local, skb->data);
Johannes Bergd0709a62008-02-25 16:27:46 +01001395 if (dsta && dsta->sdata->dev == dev) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001396 /*
1397 * The destination station is associated to
1398 * this AP (in this VLAN), so send the frame
1399 * directly to it and do not pass it to local
1400 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02001401 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001402 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001403 skb = NULL;
1404 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001405 }
1406 }
1407
1408 if (skb) {
Johannes Bergd1c3a372009-01-07 00:26:10 +01001409 int align __maybe_unused;
1410
1411#if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1412 /*
1413 * 'align' will only take the values 0 or 2 here
1414 * since all frames are required to be aligned
1415 * to 2-byte boundaries when being passed to
1416 * mac80211. That also explains the __skb_push()
1417 * below.
1418 */
Johannes Bergd1bcb9f2009-04-21 01:36:59 +02001419 align = (unsigned long)skb->data & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01001420 if (align) {
1421 if (WARN_ON(skb_headroom(skb) < 3)) {
1422 dev_kfree_skb(skb);
1423 skb = NULL;
1424 } else {
1425 u8 *data = skb->data;
1426 size_t len = skb->len;
1427 u8 *new = __skb_push(skb, align);
1428 memmove(new, data, len);
1429 __skb_trim(skb, len);
1430 }
1431 }
1432#endif
1433
1434 if (skb) {
1435 /* deliver to local stack */
1436 skb->protocol = eth_type_trans(skb, dev);
1437 memset(skb->cb, 0, sizeof(skb->cb));
1438 netif_rx(skb);
1439 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001440 }
1441
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001442 if (xmit_skb) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001443 /* send to wireless media */
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09001444 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001445 skb_reset_network_header(xmit_skb);
1446 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001447 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001448 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001449}
1450
Johannes Berg49461622008-06-30 15:10:45 +02001451static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001452ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001453{
1454 struct net_device *dev = rx->dev;
1455 struct ieee80211_local *local = rx->local;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001456 u16 ethertype;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001457 u8 *payload;
1458 struct sk_buff *skb = rx->skb, *frame = NULL;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001459 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1460 __le16 fc = hdr->frame_control;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001461 const struct ethhdr *eth;
1462 int remaining, err;
1463 u8 dst[ETH_ALEN];
1464 u8 src[ETH_ALEN];
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001465
Harvey Harrison358c8d92008-07-15 18:44:13 -07001466 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001467 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001468
Harvey Harrison358c8d92008-07-15 18:44:13 -07001469 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001470 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001471
Johannes Berg5cf121c2008-02-25 16:27:43 +01001472 if (!(rx->flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001473 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001474
1475 err = ieee80211_data_to_8023(rx);
1476 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001477 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001478
1479 skb->dev = dev;
1480
1481 dev->stats.rx_packets++;
1482 dev->stats.rx_bytes += skb->len;
1483
1484 /* skip the wrapping header */
1485 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1486 if (!eth)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001487 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001488
1489 while (skb != frame) {
1490 u8 padding;
1491 __be16 len = eth->h_proto;
1492 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1493
1494 remaining = skb->len;
1495 memcpy(dst, eth->h_dest, ETH_ALEN);
1496 memcpy(src, eth->h_source, ETH_ALEN);
1497
1498 padding = ((4 - subframe_len) & 0x3);
1499 /* the last MSDU has no padding */
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001500 if (subframe_len > remaining)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001501 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001502
1503 skb_pull(skb, sizeof(struct ethhdr));
1504 /* if last subframe reuse skb */
1505 if (remaining <= subframe_len + padding)
1506 frame = skb;
1507 else {
Johannes Bergd1c3a372009-01-07 00:26:10 +01001508 /*
1509 * Allocate and reserve two bytes more for payload
1510 * alignment since sizeof(struct ethhdr) is 14.
1511 */
1512 frame = dev_alloc_skb(
1513 ALIGN(local->hw.extra_tx_headroom, 4) +
1514 subframe_len + 2);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001515
1516 if (frame == NULL)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001517 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001518
Johannes Bergd1c3a372009-01-07 00:26:10 +01001519 skb_reserve(frame,
1520 ALIGN(local->hw.extra_tx_headroom, 4) +
1521 sizeof(struct ethhdr) + 2);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001522 memcpy(skb_put(frame, ntohs(len)), skb->data,
1523 ntohs(len));
1524
1525 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1526 padding);
1527 if (!eth) {
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001528 dev_kfree_skb(frame);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001529 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001530 }
1531 }
1532
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001533 skb_reset_network_header(frame);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001534 frame->dev = dev;
1535 frame->priority = skb->priority;
1536 rx->skb = frame;
1537
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001538 payload = frame->data;
1539 ethertype = (payload[6] << 8) | payload[7];
1540
1541 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001542 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1543 compare_ether_addr(payload,
1544 bridge_tunnel_header) == 0)) {
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001545 /* remove RFC1042 or Bridge-Tunnel
1546 * encapsulation and replace EtherType */
1547 skb_pull(frame, 6);
1548 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1549 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1550 } else {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001551 memcpy(skb_push(frame, sizeof(__be16)),
1552 &len, sizeof(__be16));
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001553 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1554 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1555 }
1556
Harvey Harrison358c8d92008-07-15 18:44:13 -07001557 if (!ieee80211_frame_allowed(rx, fc)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001558 if (skb == frame) /* last frame */
Johannes Berge4c26ad2008-01-31 19:48:21 +01001559 return RX_DROP_UNUSABLE;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001560 dev_kfree_skb(frame);
1561 continue;
1562 }
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001563
1564 ieee80211_deliver_skb(rx);
1565 }
1566
Johannes Berg9ae54c82008-01-31 19:48:20 +01001567 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001568}
1569
Ingo Molnarbf94e172008-10-12 23:51:38 -07001570#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02001571static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001572ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1573{
1574 struct ieee80211_hdr *hdr;
1575 struct ieee80211s_hdr *mesh_hdr;
1576 unsigned int hdrlen;
1577 struct sk_buff *skb = rx->skb, *fwd_skb;
1578
1579 hdr = (struct ieee80211_hdr *) skb->data;
1580 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1581 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1582
1583 if (!ieee80211_is_data(hdr->frame_control))
1584 return RX_CONTINUE;
1585
1586 if (!mesh_hdr->ttl)
1587 /* illegal frame */
1588 return RX_DROP_MONITOR;
1589
YanBo79617de2008-09-22 13:30:32 +08001590 if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){
1591 struct ieee80211_sub_if_data *sdata;
1592 struct mesh_path *mppath;
1593
1594 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1595 rcu_read_lock();
1596 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1597 if (!mppath) {
1598 mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1599 } else {
1600 spin_lock_bh(&mppath->state_lock);
1601 mppath->exp_time = jiffies;
1602 if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1603 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1604 spin_unlock_bh(&mppath->state_lock);
1605 }
1606 rcu_read_unlock();
1607 }
1608
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001609 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1610 return RX_CONTINUE;
1611
1612 mesh_hdr->ttl--;
1613
1614 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1615 if (!mesh_hdr->ttl)
Johannes Berg472dbc42008-09-11 00:01:49 +02001616 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001617 dropped_frames_ttl);
1618 else {
1619 struct ieee80211_hdr *fwd_hdr;
1620 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1621
1622 if (!fwd_skb && net_ratelimit())
1623 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1624 rx->dev->name);
1625
1626 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1627 /*
1628 * Save TA to addr1 to send TA a path error if a
1629 * suitable next hop is not found
1630 */
1631 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1632 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1633 fwd_skb->dev = rx->local->mdev;
1634 fwd_skb->iif = rx->dev->ifindex;
1635 dev_queue_xmit(fwd_skb);
1636 }
1637 }
1638
1639 if (is_multicast_ether_addr(hdr->addr3) ||
1640 rx->dev->flags & IFF_PROMISC)
1641 return RX_CONTINUE;
1642 else
1643 return RX_DROP_MONITOR;
1644}
Ingo Molnarbf94e172008-10-12 23:51:38 -07001645#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001646
1647static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001648ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001649{
1650 struct net_device *dev = rx->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001651 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1652 __le16 fc = hdr->frame_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001653 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001654
Harvey Harrison358c8d92008-07-15 18:44:13 -07001655 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001656 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001657
Harvey Harrison358c8d92008-07-15 18:44:13 -07001658 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001659 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001660
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001661 err = ieee80211_data_to_8023(rx);
1662 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001663 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001664
Harvey Harrison358c8d92008-07-15 18:44:13 -07001665 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001666 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001667
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001668 rx->skb->dev = dev;
1669
1670 dev->stats.rx_packets++;
1671 dev->stats.rx_bytes += rx->skb->len;
1672
1673 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02001674
Johannes Berg9ae54c82008-01-31 19:48:20 +01001675 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001676}
1677
Johannes Berg49461622008-06-30 15:10:45 +02001678static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001679ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
Ron Rindjunsky71364712007-12-25 17:00:36 +02001680{
1681 struct ieee80211_local *local = rx->local;
1682 struct ieee80211_hw *hw = &local->hw;
1683 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07001684 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001685 struct tid_ampdu_rx *tid_agg_rx;
1686 u16 start_seq_num;
1687 u16 tid;
1688
Harvey Harrisona7767f92008-07-02 16:30:51 -07001689 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001690 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001691
Harvey Harrisona7767f92008-07-02 16:30:51 -07001692 if (ieee80211_is_back_req(bar->frame_control)) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001693 if (!rx->sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001694 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001695 tid = le16_to_cpu(bar->control) >> 12;
Ron Rindjunskycee24a32008-03-26 20:36:03 +02001696 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1697 != HT_AGG_STATE_OPERATIONAL)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001698 return RX_CONTINUE;
Ron Rindjunskycee24a32008-03-26 20:36:03 +02001699 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
Ron Rindjunsky71364712007-12-25 17:00:36 +02001700
1701 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1702
1703 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01001704 if (tid_agg_rx->timeout)
1705 mod_timer(&tid_agg_rx->session_timer,
1706 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02001707
1708 /* manage reordering buffer according to requested */
1709 /* sequence number */
1710 rcu_read_lock();
Vasanthakumar Thiagarajanb3631282009-03-25 18:10:18 +05301711 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, NULL,
Ron Rindjunsky71364712007-12-25 17:00:36 +02001712 start_seq_num, 1);
1713 rcu_read_unlock();
Johannes Berge4c26ad2008-01-31 19:48:21 +01001714 return RX_DROP_UNUSABLE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001715 }
1716
Johannes Berg9ae54c82008-01-31 19:48:20 +01001717 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001718}
1719
Jouni Malinenf4f727a2009-01-10 11:46:53 +02001720static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1721 struct ieee80211_mgmt *mgmt,
1722 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02001723{
1724 struct ieee80211_local *local = sdata->local;
1725 struct sk_buff *skb;
1726 struct ieee80211_mgmt *resp;
1727
1728 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1729 /* Not to own unicast address */
1730 return;
1731 }
1732
Johannes Berg46900292009-02-15 12:44:28 +01001733 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1734 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
Jouni Malinenfea14732009-01-08 13:32:06 +02001735 /* Not from the current AP. */
1736 return;
1737 }
1738
Johannes Berg46900292009-02-15 12:44:28 +01001739 if (sdata->u.mgd.state == IEEE80211_STA_MLME_ASSOCIATE) {
Jouni Malinenfea14732009-01-08 13:32:06 +02001740 /* Association in progress; ignore SA Query */
1741 return;
1742 }
1743
1744 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1745 /* Too short SA Query request frame */
1746 return;
1747 }
1748
1749 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1750 if (skb == NULL)
1751 return;
1752
1753 skb_reserve(skb, local->hw.extra_tx_headroom);
1754 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1755 memset(resp, 0, 24);
1756 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1757 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01001758 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02001759 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1760 IEEE80211_STYPE_ACTION);
1761 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1762 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1763 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1764 memcpy(resp->u.action.u.sa_query.trans_id,
1765 mgmt->u.action.u.sa_query.trans_id,
1766 WLAN_SA_QUERY_TR_ID_LEN);
1767
1768 ieee80211_tx_skb(sdata, skb, 1);
1769}
1770
Johannes Berg49461622008-06-30 15:10:45 +02001771static ieee80211_rx_result debug_noinline
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001772ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1773{
1774 struct ieee80211_local *local = rx->local;
1775 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1776 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Sujithc481ec92009-01-06 09:28:37 +05301777 struct ieee80211_bss *bss;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001778 int len = rx->skb->len;
1779
1780 if (!ieee80211_is_action(mgmt->frame_control))
1781 return RX_CONTINUE;
1782
1783 if (!rx->sta)
1784 return RX_DROP_MONITOR;
1785
1786 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1787 return RX_DROP_MONITOR;
1788
Jouni Malinen97ebe122009-01-08 13:32:08 +02001789 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1790 return RX_DROP_MONITOR;
1791
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001792 /* all categories we currently handle have action_code */
1793 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1794 return RX_DROP_MONITOR;
1795
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001796 switch (mgmt->u.action.category) {
1797 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01001798 /*
1799 * The aggregation code is not prepared to handle
1800 * anything but STA/AP due to the BSSID handling;
1801 * IBSS could work in the code but isn't supported
1802 * by drivers or the standard.
1803 */
1804 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1805 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1806 sdata->vif.type != NL80211_IFTYPE_AP)
1807 return RX_DROP_MONITOR;
1808
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001809 switch (mgmt->u.action.u.addba_req.action_code) {
1810 case WLAN_ACTION_ADDBA_REQ:
1811 if (len < (IEEE80211_MIN_ACTION_SIZE +
1812 sizeof(mgmt->u.action.u.addba_req)))
1813 return RX_DROP_MONITOR;
1814 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1815 break;
1816 case WLAN_ACTION_ADDBA_RESP:
1817 if (len < (IEEE80211_MIN_ACTION_SIZE +
1818 sizeof(mgmt->u.action.u.addba_resp)))
1819 return RX_DROP_MONITOR;
1820 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1821 break;
1822 case WLAN_ACTION_DELBA:
1823 if (len < (IEEE80211_MIN_ACTION_SIZE +
1824 sizeof(mgmt->u.action.u.delba)))
1825 return RX_DROP_MONITOR;
1826 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1827 break;
1828 }
Johannes Berg39192c02008-09-09 14:49:03 +02001829 break;
1830 case WLAN_CATEGORY_SPECTRUM_MGMT:
1831 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1832 return RX_DROP_MONITOR;
Johannes Berg46900292009-02-15 12:44:28 +01001833
1834 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1835 return RX_DROP_MONITOR;
1836
Johannes Berg39192c02008-09-09 14:49:03 +02001837 switch (mgmt->u.action.u.measurement.action_code) {
1838 case WLAN_ACTION_SPCT_MSR_REQ:
1839 if (len < (IEEE80211_MIN_ACTION_SIZE +
1840 sizeof(mgmt->u.action.u.measurement)))
1841 return RX_DROP_MONITOR;
1842 ieee80211_process_measurement_req(sdata, mgmt, len);
1843 break;
Sujithc481ec92009-01-06 09:28:37 +05301844 case WLAN_ACTION_SPCT_CHL_SWITCH:
1845 if (len < (IEEE80211_MIN_ACTION_SIZE +
1846 sizeof(mgmt->u.action.u.chan_switch)))
1847 return RX_DROP_MONITOR;
1848
Johannes Berg46900292009-02-15 12:44:28 +01001849 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
Sujithc481ec92009-01-06 09:28:37 +05301850 return RX_DROP_MONITOR;
1851
Johannes Berg46900292009-02-15 12:44:28 +01001852 bss = ieee80211_rx_bss_get(local, sdata->u.mgd.bssid,
Sujithc481ec92009-01-06 09:28:37 +05301853 local->hw.conf.channel->center_freq,
Johannes Berg46900292009-02-15 12:44:28 +01001854 sdata->u.mgd.ssid,
1855 sdata->u.mgd.ssid_len);
Sujithc481ec92009-01-06 09:28:37 +05301856 if (!bss)
1857 return RX_DROP_MONITOR;
1858
1859 ieee80211_process_chanswitch(sdata,
1860 &mgmt->u.action.u.chan_switch.sw_elem, bss);
1861 ieee80211_rx_bss_put(local, bss);
1862 break;
Johannes Berg39192c02008-09-09 14:49:03 +02001863 }
1864 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02001865 case WLAN_CATEGORY_SA_QUERY:
1866 if (len < (IEEE80211_MIN_ACTION_SIZE +
1867 sizeof(mgmt->u.action.u.sa_query)))
1868 return RX_DROP_MONITOR;
1869 switch (mgmt->u.action.u.sa_query.action) {
1870 case WLAN_ACTION_SA_QUERY_REQUEST:
1871 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1872 return RX_DROP_MONITOR;
1873 ieee80211_process_sa_query_req(sdata, mgmt, len);
1874 break;
1875 case WLAN_ACTION_SA_QUERY_RESPONSE:
1876 /*
1877 * SA Query response is currently only used in AP mode
1878 * and it is processed in user space.
1879 */
1880 return RX_CONTINUE;
1881 }
1882 break;
Johannes Berg39192c02008-09-09 14:49:03 +02001883 default:
1884 return RX_CONTINUE;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001885 }
1886
Johannes Berg39192c02008-09-09 14:49:03 +02001887 rx->sta->rx_packets++;
1888 dev_kfree_skb(rx->skb);
1889 return RX_QUEUED;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001890}
1891
1892static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001893ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001894{
Johannes Berg759ef3e2008-09-09 14:55:09 +02001895 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
Jouni Malinen97ebe122009-01-08 13:32:08 +02001896 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001897
Johannes Berg5cf121c2008-02-25 16:27:43 +01001898 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001899 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001900
Jouni Malinen97ebe122009-01-08 13:32:08 +02001901 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1902 return RX_DROP_MONITOR;
1903
Johannes Berg472dbc42008-09-11 00:01:49 +02001904 if (ieee80211_vif_is_mesh(&sdata->vif))
1905 return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status);
1906
Johannes Berg3832c282009-03-24 08:46:57 +01001907 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
Johannes Berg7986cf92009-03-21 17:08:43 +01001908 return ieee80211_ibss_rx_mgmt(sdata, rx->skb, rx->status);
Johannes Bergf9d540e2007-09-28 14:02:09 +02001909
Johannes Berg7986cf92009-03-21 17:08:43 +01001910 if (sdata->vif.type == NL80211_IFTYPE_STATION)
Johannes Berg46900292009-02-15 12:44:28 +01001911 return ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status);
Johannes Berg46900292009-02-15 12:44:28 +01001912
Johannes Berg7986cf92009-03-21 17:08:43 +01001913 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001914}
1915
Johannes Berg571ecf62007-07-27 15:43:22 +02001916static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1917 struct ieee80211_hdr *hdr,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001918 struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001919{
Harvey Harrisona7767f92008-07-02 16:30:51 -07001920 int keyidx;
1921 unsigned int hdrlen;
Johannes Berg571ecf62007-07-27 15:43:22 +02001922
Harvey Harrisona7767f92008-07-02 16:30:51 -07001923 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +02001924 if (rx->skb->len >= hdrlen + 4)
1925 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1926 else
1927 keyidx = -1;
1928
Johannes Berg8944b792008-01-31 19:48:26 +01001929 if (!rx->sta) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001930 /*
1931 * Some hardware seem to generate incorrect Michael MIC
1932 * reports; ignore them to avoid triggering countermeasures.
1933 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001934 goto ignore;
1935 }
1936
Harvey Harrisona7767f92008-07-02 16:30:51 -07001937 if (!ieee80211_has_protected(hdr->frame_control))
Johannes Berg571ecf62007-07-27 15:43:22 +02001938 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001939
Johannes Berg05c914f2008-09-11 00:01:58 +02001940 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001941 /*
1942 * APs with pairwise keys should never receive Michael MIC
1943 * errors for non-zero keyidx because these are reserved for
1944 * group keys and only the AP is sending real multicast
1945 * frames in the BSS.
1946 */
Johannes Bergeb063c12007-08-28 17:01:53 -04001947 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001948 }
1949
Harvey Harrisona7767f92008-07-02 16:30:51 -07001950 if (!ieee80211_is_data(hdr->frame_control) &&
1951 !ieee80211_is_auth(hdr->frame_control))
Johannes Berg571ecf62007-07-27 15:43:22 +02001952 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001953
Jouni Malinena3b8b052009-03-27 21:59:49 +02001954 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL);
Johannes Berg571ecf62007-07-27 15:43:22 +02001955 ignore:
1956 dev_kfree_skb(rx->skb);
1957 rx->skb = NULL;
1958}
1959
Johannes Berg5cf121c2008-02-25 16:27:43 +01001960/* TODO: use IEEE80211_RX_FRAGMENTED */
1961static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
Michael Wu3d30d942008-01-31 19:48:27 +01001962{
1963 struct ieee80211_sub_if_data *sdata;
1964 struct ieee80211_local *local = rx->local;
1965 struct ieee80211_rtap_hdr {
1966 struct ieee80211_radiotap_header hdr;
1967 u8 flags;
1968 u8 rate;
1969 __le16 chan_freq;
1970 __le16 chan_flags;
1971 } __attribute__ ((packed)) *rthdr;
1972 struct sk_buff *skb = rx->skb, *skb2;
1973 struct net_device *prev_dev = NULL;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001974 struct ieee80211_rx_status *status = rx->status;
Michael Wu3d30d942008-01-31 19:48:27 +01001975
Johannes Berg5cf121c2008-02-25 16:27:43 +01001976 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
Michael Wu3d30d942008-01-31 19:48:27 +01001977 goto out_free_skb;
1978
1979 if (skb_headroom(skb) < sizeof(*rthdr) &&
1980 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1981 goto out_free_skb;
1982
1983 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1984 memset(rthdr, 0, sizeof(*rthdr));
1985 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1986 rthdr->hdr.it_present =
1987 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1988 (1 << IEEE80211_RADIOTAP_RATE) |
1989 (1 << IEEE80211_RADIOTAP_CHANNEL));
1990
Johannes Berg5cf121c2008-02-25 16:27:43 +01001991 rthdr->rate = rx->rate->bitrate / 5;
Michael Wu3d30d942008-01-31 19:48:27 +01001992 rthdr->chan_freq = cpu_to_le16(status->freq);
1993
1994 if (status->band == IEEE80211_BAND_5GHZ)
1995 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1996 IEEE80211_CHAN_5GHZ);
1997 else
1998 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1999 IEEE80211_CHAN_2GHZ);
2000
2001 skb_set_mac_header(skb, 0);
2002 skb->ip_summed = CHECKSUM_UNNECESSARY;
2003 skb->pkt_type = PACKET_OTHERHOST;
2004 skb->protocol = htons(ETH_P_802_2);
2005
2006 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2007 if (!netif_running(sdata->dev))
2008 continue;
2009
Johannes Berg05c914f2008-09-11 00:01:58 +02002010 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Michael Wu3d30d942008-01-31 19:48:27 +01002011 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2012 continue;
2013
2014 if (prev_dev) {
2015 skb2 = skb_clone(skb, GFP_ATOMIC);
2016 if (skb2) {
2017 skb2->dev = prev_dev;
2018 netif_rx(skb2);
2019 }
2020 }
2021
2022 prev_dev = sdata->dev;
2023 sdata->dev->stats.rx_packets++;
2024 sdata->dev->stats.rx_bytes += skb->len;
2025 }
2026
2027 if (prev_dev) {
2028 skb->dev = prev_dev;
2029 netif_rx(skb);
2030 skb = NULL;
2031 } else
2032 goto out_free_skb;
2033
Johannes Berg5cf121c2008-02-25 16:27:43 +01002034 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
Michael Wu3d30d942008-01-31 19:48:27 +01002035 return;
2036
2037 out_free_skb:
2038 dev_kfree_skb(skb);
2039}
2040
Johannes Berg571ecf62007-07-27 15:43:22 +02002041
Johannes Berg8944b792008-01-31 19:48:26 +01002042static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg5cf121c2008-02-25 16:27:43 +01002043 struct ieee80211_rx_data *rx,
Johannes Berg8944b792008-01-31 19:48:26 +01002044 struct sk_buff *skb)
Johannes Berg58905292008-01-31 19:48:25 +01002045{
Johannes Berg58905292008-01-31 19:48:25 +01002046 ieee80211_rx_result res = RX_DROP_MONITOR;
2047
Johannes Berg8944b792008-01-31 19:48:26 +01002048 rx->skb = skb;
2049 rx->sdata = sdata;
2050 rx->dev = sdata->dev;
2051
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002052#define CALL_RXH(rxh) \
2053 do { \
2054 res = rxh(rx); \
2055 if (res != RX_CONTINUE) \
2056 goto rxh_done; \
2057 } while (0);
Johannes Berg58905292008-01-31 19:48:25 +01002058
Johannes Berg49461622008-06-30 15:10:45 +02002059 CALL_RXH(ieee80211_rx_h_passive_scan)
2060 CALL_RXH(ieee80211_rx_h_check)
2061 CALL_RXH(ieee80211_rx_h_decrypt)
Kalle Valo572e0012009-02-10 17:09:31 +02002062 CALL_RXH(ieee80211_rx_h_check_more_data)
Johannes Berg49461622008-06-30 15:10:45 +02002063 CALL_RXH(ieee80211_rx_h_sta_process)
2064 CALL_RXH(ieee80211_rx_h_defragment)
2065 CALL_RXH(ieee80211_rx_h_ps_poll)
2066 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2067 /* must be after MMIC verify so header is counted in MPDU mic */
2068 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2069 CALL_RXH(ieee80211_rx_h_amsdu)
Ingo Molnarbf94e172008-10-12 23:51:38 -07002070#ifdef CONFIG_MAC80211_MESH
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002071 if (ieee80211_vif_is_mesh(&sdata->vif))
2072 CALL_RXH(ieee80211_rx_h_mesh_fwding);
Ingo Molnarbf94e172008-10-12 23:51:38 -07002073#endif
Johannes Berg49461622008-06-30 15:10:45 +02002074 CALL_RXH(ieee80211_rx_h_data)
2075 CALL_RXH(ieee80211_rx_h_ctrl)
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002076 CALL_RXH(ieee80211_rx_h_action)
Johannes Berg49461622008-06-30 15:10:45 +02002077 CALL_RXH(ieee80211_rx_h_mgmt)
Johannes Berg58905292008-01-31 19:48:25 +01002078
Johannes Berg49461622008-06-30 15:10:45 +02002079#undef CALL_RXH
2080
2081 rxh_done:
Johannes Berg58905292008-01-31 19:48:25 +01002082 switch (res) {
Michael Wu3d30d942008-01-31 19:48:27 +01002083 case RX_DROP_MONITOR:
Johannes Berg49461622008-06-30 15:10:45 +02002084 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2085 if (rx->sta)
2086 rx->sta->rx_dropped++;
2087 /* fall through */
2088 case RX_CONTINUE:
Michael Wu3d30d942008-01-31 19:48:27 +01002089 ieee80211_rx_cooked_monitor(rx);
2090 break;
2091 case RX_DROP_UNUSABLE:
Johannes Berg49461622008-06-30 15:10:45 +02002092 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2093 if (rx->sta)
2094 rx->sta->rx_dropped++;
Johannes Berg58905292008-01-31 19:48:25 +01002095 dev_kfree_skb(rx->skb);
2096 break;
Johannes Berg49461622008-06-30 15:10:45 +02002097 case RX_QUEUED:
2098 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2099 break;
Johannes Berg58905292008-01-31 19:48:25 +01002100 }
2101}
2102
Johannes Berg571ecf62007-07-27 15:43:22 +02002103/* main receive path */
2104
Johannes Berg23a24de2007-07-27 15:43:22 +02002105static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg7ab17c42009-02-10 21:25:43 +01002106 struct ieee80211_rx_data *rx,
Johannes Berg23a24de2007-07-27 15:43:22 +02002107 struct ieee80211_hdr *hdr)
2108{
Johannes Berg7ab17c42009-02-10 21:25:43 +01002109 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02002110 int multicast = is_multicast_ether_addr(hdr->addr1);
2111
Johannes Berg51fb61e2007-12-19 01:31:27 +01002112 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02002113 case NL80211_IFTYPE_STATION:
Johannes Berg23a24de2007-07-27 15:43:22 +02002114 if (!bssid)
2115 return 0;
Johannes Berg46900292009-02-15 12:44:28 +01002116 if (!ieee80211_bssid_match(bssid, sdata->u.mgd.bssid)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01002117 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002118 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002119 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002120 } else if (!multicast &&
2121 compare_ether_addr(sdata->dev->dev_addr,
2122 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002123 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002124 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002125 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002126 }
2127 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002128 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02002129 if (!bssid)
2130 return 0;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002131 if (ieee80211_is_beacon(hdr->frame_control)) {
Bruno Randolf9d9bf772008-02-18 11:21:36 +09002132 return 1;
Vladimir Koutny87291c02008-06-13 16:50:44 +02002133 }
Johannes Berg46900292009-02-15 12:44:28 +01002134 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01002135 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002136 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002137 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002138 } else if (!multicast &&
2139 compare_ether_addr(sdata->dev->dev_addr,
2140 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002141 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002142 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002143 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002144 } else if (!rx->sta) {
2145 int rate_idx;
2146 if (rx->status->flag & RX_FLAG_HT)
2147 rate_idx = 0; /* TODO: HT rates */
2148 else
2149 rate_idx = rx->status->rate_idx;
Rami Rosenab1f5c02008-12-11 14:00:25 +02002150 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002151 BIT(rate_idx));
2152 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002153 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002154 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg6032f932008-02-23 15:17:07 +01002155 if (!multicast &&
2156 compare_ether_addr(sdata->dev->dev_addr,
2157 hdr->addr1) != 0) {
2158 if (!(sdata->dev->flags & IFF_PROMISC))
2159 return 0;
2160
Johannes Berg5cf121c2008-02-25 16:27:43 +01002161 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg6032f932008-02-23 15:17:07 +01002162 }
2163 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002164 case NL80211_IFTYPE_AP_VLAN:
2165 case NL80211_IFTYPE_AP:
Johannes Berg23a24de2007-07-27 15:43:22 +02002166 if (!bssid) {
2167 if (compare_ether_addr(sdata->dev->dev_addr,
2168 hdr->addr1))
2169 return 0;
2170 } else if (!ieee80211_bssid_match(bssid,
2171 sdata->dev->dev_addr)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01002172 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002173 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002174 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002175 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002176 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002177 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07002178 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02002179 return 0;
2180 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2181 return 0;
2182 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002183 case NL80211_IFTYPE_MONITOR:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02002184 /* take everything */
2185 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002186 case NL80211_IFTYPE_UNSPECIFIED:
2187 case __NL80211_IFTYPE_AFTER_LAST:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02002188 /* should never get here */
2189 WARN_ON(1);
2190 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02002191 }
2192
2193 return 1;
2194}
2195
Johannes Berg571ecf62007-07-27 15:43:22 +02002196/*
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002197 * This is the actual Rx frames handler. as it blongs to Rx path it must
2198 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02002199 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002200static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2201 struct sk_buff *skb,
2202 struct ieee80211_rx_status *status,
Johannes Berg8318d782008-01-24 19:38:38 +01002203 struct ieee80211_rate *rate)
Johannes Berg571ecf62007-07-27 15:43:22 +02002204{
2205 struct ieee80211_local *local = hw_to_local(hw);
2206 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002207 struct ieee80211_hdr *hdr;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002208 struct ieee80211_rx_data rx;
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002209 int prepares;
Johannes Berg8e6f0032007-07-27 15:43:22 +02002210 struct ieee80211_sub_if_data *prev = NULL;
2211 struct sk_buff *skb_new;
Johannes Berg571ecf62007-07-27 15:43:22 +02002212
Harvey Harrison358c8d92008-07-15 18:44:13 -07002213 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02002214 memset(&rx, 0, sizeof(rx));
2215 rx.skb = skb;
2216 rx.local = local;
2217
Johannes Berg5cf121c2008-02-25 16:27:43 +01002218 rx.status = status;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002219 rx.rate = rate;
Johannes Berg72abd812007-09-17 01:29:22 -04002220
Harvey Harrison358c8d92008-07-15 18:44:13 -07002221 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
Johannes Berg571ecf62007-07-27 15:43:22 +02002222 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02002223
Johannes Berg8944b792008-01-31 19:48:26 +01002224 rx.sta = sta_info_get(local, hdr->addr2);
2225 if (rx.sta) {
Johannes Bergd0709a62008-02-25 16:27:46 +01002226 rx.sdata = rx.sta->sdata;
2227 rx.dev = rx.sta->sdata->dev;
Johannes Bergb2e77712007-09-26 15:19:39 +02002228 }
Johannes Berg571ecf62007-07-27 15:43:22 +02002229
Johannes Berg571ecf62007-07-27 15:43:22 +02002230 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
Johannes Berg8944b792008-01-31 19:48:26 +01002231 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
Johannes Bergd0709a62008-02-25 16:27:46 +01002232 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002233 }
2234
Johannes Bergc2b13452008-09-11 00:01:55 +02002235 if (unlikely(local->sw_scanning || local->hw_scanning))
Johannes Berg5cf121c2008-02-25 16:27:43 +01002236 rx.flags |= IEEE80211_RX_IN_SCAN;
Johannes Berg571ecf62007-07-27 15:43:22 +02002237
Johannes Berg38f37142008-01-29 17:07:43 +01002238 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01002239 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01002240
Johannes Berg571ecf62007-07-27 15:43:22 +02002241 skb = rx.skb;
2242
Johannes Berg79010422007-09-18 17:29:21 -04002243 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg2a8a9a82007-08-28 17:01:52 -04002244 if (!netif_running(sdata->dev))
2245 continue;
2246
Johannes Berg05c914f2008-09-11 00:01:58 +02002247 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +02002248 continue;
2249
Johannes Berg5cf121c2008-02-25 16:27:43 +01002250 rx.flags |= IEEE80211_RX_RA_MATCH;
Johannes Berg7ab17c42009-02-10 21:25:43 +01002251 prepares = prepare_for_handlers(sdata, &rx, hdr);
Johannes Berg23a24de2007-07-27 15:43:22 +02002252
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002253 if (!prepares)
Johannes Berg23a24de2007-07-27 15:43:22 +02002254 continue;
Johannes Berg8e6f0032007-07-27 15:43:22 +02002255
Johannes Berg340e11f2007-07-27 15:43:22 +02002256 /*
2257 * frame is destined for this interface, but if it's not
2258 * also for the previous one we handle that after the
2259 * loop to avoid copying the SKB once too much
2260 */
2261
2262 if (!prev) {
2263 prev = sdata;
2264 continue;
Johannes Berg8e6f0032007-07-27 15:43:22 +02002265 }
Johannes Berg340e11f2007-07-27 15:43:22 +02002266
2267 /*
2268 * frame was destined for the previous interface
2269 * so invoke RX handlers for it
2270 */
2271
2272 skb_new = skb_copy(skb, GFP_ATOMIC);
2273 if (!skb_new) {
2274 if (net_ratelimit())
2275 printk(KERN_DEBUG "%s: failed to copy "
Pavel Roskina4278e12008-05-12 09:02:24 -04002276 "multicast frame for %s\n",
Johannes Bergdd1cd4c2007-09-18 17:29:20 -04002277 wiphy_name(local->hw.wiphy),
2278 prev->dev->name);
Johannes Berg340e11f2007-07-27 15:43:22 +02002279 continue;
2280 }
Johannes Berg8944b792008-01-31 19:48:26 +01002281 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
Johannes Berg8e6f0032007-07-27 15:43:22 +02002282 prev = sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002283 }
Harvey Harrisona4b7d7b2008-07-15 18:44:14 -07002284 if (prev)
Johannes Berg8944b792008-01-31 19:48:26 +01002285 ieee80211_invoke_rx_handlers(prev, &rx, skb);
Harvey Harrisona4b7d7b2008-07-15 18:44:14 -07002286 else
Johannes Berg8e6f0032007-07-27 15:43:22 +02002287 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002288}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002289
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002290#define SEQ_MODULO 0x1000
2291#define SEQ_MASK 0xfff
2292
2293static inline int seq_less(u16 sq1, u16 sq2)
2294{
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002295 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002296}
2297
2298static inline u16 seq_inc(u16 sq)
2299{
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002300 return (sq + 1) & SEQ_MASK;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002301}
2302
2303static inline u16 seq_sub(u16 sq1, u16 sq2)
2304{
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002305 return (sq1 - sq2) & SEQ_MASK;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002306}
2307
2308
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002309static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
2310 struct tid_ampdu_rx *tid_agg_rx,
2311 int index)
2312{
2313 struct ieee80211_supported_band *sband;
2314 struct ieee80211_rate *rate;
2315 struct ieee80211_rx_status status;
2316
2317 if (!tid_agg_rx->reorder_buf[index])
2318 goto no_frame;
2319
2320 /* release the reordered frames to stack */
2321 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb, sizeof(status));
2322 sband = hw->wiphy->bands[status.band];
2323 if (status.flag & RX_FLAG_HT)
2324 rate = sband->bitrates; /* TODO: HT rates */
2325 else
2326 rate = &sband->bitrates[status.rate_idx];
2327 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
2328 &status, rate);
2329 tid_agg_rx->stored_mpdu_num--;
2330 tid_agg_rx->reorder_buf[index] = NULL;
2331
2332no_frame:
2333 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2334}
2335
2336
Ron Rindjunsky71364712007-12-25 17:00:36 +02002337/*
Jouni Malinen4d050f12009-05-05 20:35:14 +03002338 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2339 * the skb was added to the buffer longer than this time ago, the earlier
2340 * frames that have not yet been received are assumed to be lost and the skb
2341 * can be released for processing. This may also release other skb's from the
2342 * reorder buffer if there are no additional gaps between the frames.
2343 */
2344#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2345
2346/*
Ron Rindjunsky71364712007-12-25 17:00:36 +02002347 * As it function blongs to Rx path it must be called with
2348 * the proper rcu_read_lock protection for its flow.
2349 */
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002350static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2351 struct tid_ampdu_rx *tid_agg_rx,
2352 struct sk_buff *skb,
Vasanthakumar Thiagarajanb3631282009-03-25 18:10:18 +05302353 struct ieee80211_rx_status *rxstatus,
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002354 u16 mpdu_seq_num,
2355 int bar_req)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002356{
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002357 u16 head_seq_num, buf_size;
2358 int index;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002359
2360 buf_size = tid_agg_rx->buf_size;
2361 head_seq_num = tid_agg_rx->head_seq_num;
2362
2363 /* frame with out of date sequence number */
2364 if (seq_less(mpdu_seq_num, head_seq_num)) {
2365 dev_kfree_skb(skb);
2366 return 1;
2367 }
2368
2369 /* if frame sequence number exceeds our buffering window size or
2370 * block Ack Request arrived - release stored frames */
2371 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2372 /* new head to the ordering buffer */
2373 if (bar_req)
2374 head_seq_num = mpdu_seq_num;
2375 else
2376 head_seq_num =
2377 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2378 /* release stored frames up to new head to stack */
2379 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2380 index = seq_sub(tid_agg_rx->head_seq_num,
2381 tid_agg_rx->ssn)
2382 % tid_agg_rx->buf_size;
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002383 ieee80211_release_reorder_frame(hw, tid_agg_rx,
2384 index);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002385 }
2386 if (bar_req)
2387 return 1;
2388 }
2389
2390 /* now the new frame is always in the range of the reordering */
2391 /* buffer window */
2392 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2393 % tid_agg_rx->buf_size;
2394 /* check if we already stored this frame */
2395 if (tid_agg_rx->reorder_buf[index]) {
2396 dev_kfree_skb(skb);
2397 return 1;
2398 }
2399
2400 /* if arrived mpdu is in the right order and nothing else stored */
2401 /* release it immediately */
2402 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2403 tid_agg_rx->stored_mpdu_num == 0) {
2404 tid_agg_rx->head_seq_num =
2405 seq_inc(tid_agg_rx->head_seq_num);
2406 return 0;
2407 }
2408
2409 /* put the frame in the reordering buffer */
2410 tid_agg_rx->reorder_buf[index] = skb;
Jouni Malinen4d050f12009-05-05 20:35:14 +03002411 tid_agg_rx->reorder_time[index] = jiffies;
Vasanthakumar Thiagarajanb3631282009-03-25 18:10:18 +05302412 memcpy(tid_agg_rx->reorder_buf[index]->cb, rxstatus,
2413 sizeof(*rxstatus));
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002414 tid_agg_rx->stored_mpdu_num++;
2415 /* release the buffer until next missing frame */
2416 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2417 % tid_agg_rx->buf_size;
Jouni Malinen4d050f12009-05-05 20:35:14 +03002418 if (!tid_agg_rx->reorder_buf[index] &&
2419 tid_agg_rx->stored_mpdu_num > 1) {
2420 /*
2421 * No buffers ready to be released, but check whether any
2422 * frames in the reorder buffer have timed out.
2423 */
2424 int j;
2425 int skipped = 1;
2426 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
2427 j = (j + 1) % tid_agg_rx->buf_size) {
2428 if (tid_agg_rx->reorder_buf[j] == NULL) {
2429 skipped++;
2430 continue;
2431 }
2432 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
2433 HZ / 10))
2434 break;
2435
2436#ifdef CONFIG_MAC80211_HT_DEBUG
2437 if (net_ratelimit())
2438 printk(KERN_DEBUG "%s: release an RX reorder "
2439 "frame due to timeout on earlier "
2440 "frames\n",
2441 wiphy_name(hw->wiphy));
2442#endif
2443 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
2444
2445 /*
2446 * Increment the head seq# also for the skipped slots.
2447 */
2448 tid_agg_rx->head_seq_num =
2449 (tid_agg_rx->head_seq_num + skipped) &
2450 SEQ_MASK;
2451 skipped = 0;
2452 }
2453 } else while (tid_agg_rx->reorder_buf[index]) {
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002454 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002455 index = seq_sub(tid_agg_rx->head_seq_num,
2456 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2457 }
2458 return 1;
2459}
2460
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002461static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
Vasanthakumar Thiagarajanb3631282009-03-25 18:10:18 +05302462 struct sk_buff *skb,
2463 struct ieee80211_rx_status *status)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002464{
2465 struct ieee80211_hw *hw = &local->hw;
2466 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2467 struct sta_info *sta;
2468 struct tid_ampdu_rx *tid_agg_rx;
Harvey Harrison87228f52008-06-11 14:21:59 -07002469 u16 sc;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002470 u16 mpdu_seq_num;
Harvey Harrison182503a2008-06-22 16:45:29 -07002471 u8 ret = 0;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002472 int tid;
2473
2474 sta = sta_info_get(local, hdr->addr2);
2475 if (!sta)
2476 return ret;
2477
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002478 /* filter the QoS data rx stream according to
2479 * STA/TID and check if this STA/TID is on aggregation */
Harvey Harrison87228f52008-06-11 14:21:59 -07002480 if (!ieee80211_is_data_qos(hdr->frame_control))
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002481 goto end_reorder;
2482
Harvey Harrison238f74a2008-07-02 11:05:34 -07002483 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002484
Ron Rindjunskycee24a32008-03-26 20:36:03 +02002485 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002486 goto end_reorder;
2487
Ron Rindjunskycee24a32008-03-26 20:36:03 +02002488 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2489
Emmanuel Grumbach2560b6e2008-07-10 00:47:19 +03002490 /* qos null data frames are excluded */
2491 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002492 goto end_reorder;
2493
2494 /* new un-ordered ampdu frame - process it */
2495
2496 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01002497 if (tid_agg_rx->timeout)
2498 mod_timer(&tid_agg_rx->session_timer,
2499 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002500
2501 /* if this mpdu is fragmented - terminate rx aggregation session */
2502 sc = le16_to_cpu(hdr->seq_ctrl);
2503 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Berg17741cd2008-09-11 00:02:02 +02002504 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002505 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2506 ret = 1;
2507 goto end_reorder;
2508 }
2509
2510 /* according to mpdu sequence number deal with reordering buffer */
2511 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
Vasanthakumar Thiagarajanb3631282009-03-25 18:10:18 +05302512 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, status,
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002513 mpdu_seq_num, 0);
Johannes Bergd0709a62008-02-25 16:27:46 +01002514 end_reorder:
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002515 return ret;
2516}
2517
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002518/*
2519 * This is the receive path handler. It is called by a low level driver when an
2520 * 802.11 MPDU is received from the hardware.
2521 */
2522void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2523 struct ieee80211_rx_status *status)
2524{
2525 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01002526 struct ieee80211_rate *rate = NULL;
2527 struct ieee80211_supported_band *sband;
2528
2529 if (status->band < 0 ||
Adrian Bunk13d8fd22008-04-23 12:51:28 +03002530 status->band >= IEEE80211_NUM_BANDS) {
Johannes Berg8318d782008-01-24 19:38:38 +01002531 WARN_ON(1);
2532 return;
2533 }
2534
2535 sband = local->hw.wiphy->bands[status->band];
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002536 if (!sband) {
Johannes Berg8318d782008-01-24 19:38:38 +01002537 WARN_ON(1);
2538 return;
2539 }
2540
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002541 if (status->flag & RX_FLAG_HT) {
2542 /* rate_idx is MCS index */
2543 if (WARN_ON(status->rate_idx < 0 ||
2544 status->rate_idx >= 76))
2545 return;
2546 /* HT rates are not in the table - use the highest legacy rate
2547 * for now since other parts of mac80211 may not yet be fully
2548 * MCS aware. */
2549 rate = &sband->bitrates[sband->n_bitrates - 1];
2550 } else {
2551 if (WARN_ON(status->rate_idx < 0 ||
2552 status->rate_idx >= sband->n_bitrates))
2553 return;
2554 rate = &sband->bitrates[status->rate_idx];
2555 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002556
2557 /*
2558 * key references and virtual interfaces are protected using RCU
2559 * and this requires that we are in a read-side RCU section during
2560 * receive processing
2561 */
2562 rcu_read_lock();
2563
2564 /*
2565 * Frames with failed FCS/PLCP checksum are not returned,
2566 * all other frames are returned without radiotap header
2567 * if it was previously present.
2568 * Also, frames with less than 16 bytes are dropped.
2569 */
Johannes Berg8318d782008-01-24 19:38:38 +01002570 skb = ieee80211_rx_monitor(local, skb, status, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002571 if (!skb) {
2572 rcu_read_unlock();
2573 return;
2574 }
2575
Jouni Malinenaec67952009-05-05 20:35:15 +03002576 /*
2577 * In theory, the block ack reordering should happen after duplicate
2578 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2579 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2580 * happen as a new RX handler between ieee80211_rx_h_check and
2581 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2582 * the time being, the call can be here since RX reorder buf processing
2583 * will implicitly skip duplicates. We could, in theory at least,
2584 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2585 * frames from other than operational channel), but that should not
2586 * happen in normal networks.
2587 */
Vasanthakumar Thiagarajanb3631282009-03-25 18:10:18 +05302588 if (!ieee80211_rx_reorder_ampdu(local, skb, status))
Johannes Berg9e72ebd2008-05-21 17:33:42 +02002589 __ieee80211_rx_handle_packet(hw, skb, status, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002590
2591 rcu_read_unlock();
2592}
Johannes Berg571ecf62007-07-27 15:43:22 +02002593EXPORT_SYMBOL(__ieee80211_rx);
2594
2595/* This is a version of the rx handler that can be called from hard irq
2596 * context. Post the skb on the queue and schedule the tasklet */
2597void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2598 struct ieee80211_rx_status *status)
2599{
2600 struct ieee80211_local *local = hw_to_local(hw);
2601
2602 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2603
2604 skb->dev = local->mdev;
2605 /* copy status into skb->cb for use by tasklet */
2606 memcpy(skb->cb, status, sizeof(*status));
2607 skb->pkt_type = IEEE80211_RX_MSG;
2608 skb_queue_tail(&local->skb_queue, skb);
2609 tasklet_schedule(&local->tasklet);
2610}
2611EXPORT_SYMBOL(ieee80211_rx_irqsafe);