blob: de5bba7f910ae876637c3002544a6963eebccdfd [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 Berg52865dfd2007-07-27 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 Malinen3cfcf6ac2009-01-08 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 Malinen3cfcf6ac2009-01-08 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 Malinen3cfcf6ac2009-01-08 13:32:02 +0200609 * There are four types of keys:
Johannes Berg3017b802007-08-28 17:01:53 -0400610 * - GTK (group keys)
Jouni Malinen3cfcf6ac2009-01-08 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 Malinen3cfcf6ac2009-01-08 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 Malinen3cfcf6ac2009-01-08 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 Malinen3cfcf6ac2009-01-08 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 Berg8f77f382009-06-07 21:58:37 +0200800 int sent, buffered;
Johannes Berg571ecf62007-07-27 15:43:22 +0200801
Johannes Berg3e122be2008-07-09 14:40:34 +0200802 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg004c8722008-02-20 11:21:35 +0100803
Johannes Berg07346f812008-05-03 01:02:02 +0200804 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
Johannes Berg24487982009-04-23 18:52:52 +0200805 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta);
Johannes Berg004c8722008-02-20 11:21:35 +0100806
807 if (!skb_queue_empty(&sta->ps_tx_buf))
808 sta_info_clear_tim_bit(sta);
809
Johannes Berg571ecf62007-07-27 15:43:22 +0200810#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700811 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
812 sdata->dev->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200813#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg004c8722008-02-20 11:21:35 +0100814
Johannes Berg571ecf62007-07-27 15:43:22 +0200815 /* Send all buffered frames to the station */
Johannes Berg8f77f382009-06-07 21:58:37 +0200816 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
817 buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf);
818 sent += buffered;
819 local->total_ps_buffered -= buffered;
820
Johannes Berg571ecf62007-07-27 15:43:22 +0200821#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg8f77f382009-06-07 21:58:37 +0200822 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
823 "since STA not sleeping anymore\n", sdata->dev->name,
824 sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
Johannes Berg571ecf62007-07-27 15:43:22 +0200825#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg571ecf62007-07-27 15:43:22 +0200826
827 return sent;
828}
829
Johannes Berg49461622008-06-30 15:10:45 +0200830static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100831ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200832{
833 struct sta_info *sta = rx->sta;
Harvey Harrisona7767f92008-07-02 16:30:51 -0700834 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +0200835
836 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +0100837 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200838
839 /* Update last_rx only for IBSS packets which are for the current
840 * BSSID to avoid keeping the current IBSS network alive in cases where
841 * other STAs are using different BSSID. */
Johannes Berg05c914f2008-09-11 00:01:58 +0200842 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +0200843 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +0200844 NL80211_IFTYPE_ADHOC);
Johannes Berg46900292009-02-15 12:44:28 +0100845 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
Johannes Berg571ecf62007-07-27 15:43:22 +0200846 sta->last_rx = jiffies;
847 } else
848 if (!is_multicast_ether_addr(hdr->addr1) ||
Johannes Berg05c914f2008-09-11 00:01:58 +0200849 rx->sdata->vif.type == NL80211_IFTYPE_STATION) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200850 /* Update last_rx only for unicast frames in order to prevent
851 * the Probe Request frames (the only broadcast frames from a
852 * STA in infrastructure mode) from keeping a connection alive.
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100853 * Mesh beacons will update last_rx when if they are found to
854 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +0200855 */
Kalle Valo15b7b062009-03-22 21:57:14 +0200856 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
857 ieee80211_is_beacon(hdr->frame_control)) {
858 rx->sdata->u.mgd.last_beacon = jiffies;
859 } else
860 sta->last_rx = jiffies;
Johannes Berg571ecf62007-07-27 15:43:22 +0200861 }
862
Johannes Berg5cf121c2008-02-25 16:27:43 +0100863 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100864 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200865
Kalle Valo3cf335d2009-03-22 21:57:06 +0200866 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
867 ieee80211_sta_rx_notify(rx->sdata, hdr);
868
Johannes Berg571ecf62007-07-27 15:43:22 +0200869 sta->rx_fragments++;
870 sta->rx_bytes += rx->skb->len;
Johannes Berg5cf121c2008-02-25 16:27:43 +0100871 sta->last_signal = rx->status->signal;
Bruno Randolf566bfe52008-05-08 19:15:40 +0200872 sta->last_qual = rx->status->qual;
Johannes Berg5cf121c2008-02-25 16:27:43 +0100873 sta->last_noise = rx->status->noise;
Johannes Berg571ecf62007-07-27 15:43:22 +0200874
Johannes Berg72eaa432008-11-26 15:02:58 +0100875 /*
876 * Change STA power saving mode only at the end of a frame
877 * exchange sequence.
878 */
Johannes Berg3e122be2008-07-09 14:40:34 +0200879 if (!ieee80211_has_morefrags(hdr->frame_control) &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200880 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
881 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
Johannes Berg72eaa432008-11-26 15:02:58 +0100882 if (test_sta_flags(sta, WLAN_STA_PS)) {
883 /*
884 * Ignore doze->wake transitions that are
885 * indicated by non-data frames, the standard
886 * is unclear here, but for example going to
887 * PS mode and then scanning would cause a
888 * doze->wake transition for the probe request,
889 * and that is clearly undesirable.
890 */
891 if (ieee80211_is_data(hdr->frame_control) &&
892 !ieee80211_has_pm(hdr->frame_control))
893 rx->sent_ps_buffered += ap_sta_ps_end(sta);
894 } else {
895 if (ieee80211_has_pm(hdr->frame_control))
896 ap_sta_ps_start(sta);
897 }
Johannes Berg571ecf62007-07-27 15:43:22 +0200898 }
899
900 /* Drop data::nullfunc frames silently, since they are used only to
901 * control station power saving mode. */
Harvey Harrisona7767f92008-07-02 16:30:51 -0700902 if (ieee80211_is_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200903 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
904 /* Update counter and free packet here to avoid counting this
905 * as a dropped packed. */
906 sta->rx_packets++;
907 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100908 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200909 }
910
Johannes Berg9ae54c82008-01-31 19:48:20 +0100911 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200912} /* ieee80211_rx_h_sta_process */
913
Johannes Berg571ecf62007-07-27 15:43:22 +0200914static inline struct ieee80211_fragment_entry *
915ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
916 unsigned int frag, unsigned int seq, int rx_queue,
917 struct sk_buff **skb)
918{
919 struct ieee80211_fragment_entry *entry;
920 int idx;
921
922 idx = sdata->fragment_next;
923 entry = &sdata->fragments[sdata->fragment_next++];
924 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
925 sdata->fragment_next = 0;
926
927 if (!skb_queue_empty(&entry->skb_list)) {
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200928#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg571ecf62007-07-27 15:43:22 +0200929 struct ieee80211_hdr *hdr =
930 (struct ieee80211_hdr *) entry->skb_list.next->data;
931 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
932 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
Johannes Berg0c68ae262008-10-27 15:56:10 -0700933 "addr1=%pM addr2=%pM\n",
Johannes Berg571ecf62007-07-27 15:43:22 +0200934 sdata->dev->name, idx,
935 jiffies - entry->first_frag_time, entry->seq,
Johannes Berg0c68ae262008-10-27 15:56:10 -0700936 entry->last_frag, hdr->addr1, hdr->addr2);
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200937#endif
Johannes Berg571ecf62007-07-27 15:43:22 +0200938 __skb_queue_purge(&entry->skb_list);
939 }
940
941 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
942 *skb = NULL;
943 entry->first_frag_time = jiffies;
944 entry->seq = seq;
945 entry->rx_queue = rx_queue;
946 entry->last_frag = frag;
947 entry->ccmp = 0;
948 entry->extra_len = 0;
949
950 return entry;
951}
952
953static inline struct ieee80211_fragment_entry *
954ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700955 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +0200956 int rx_queue, struct ieee80211_hdr *hdr)
957{
958 struct ieee80211_fragment_entry *entry;
959 int i, idx;
960
961 idx = sdata->fragment_next;
962 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
963 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +0200964
965 idx--;
966 if (idx < 0)
967 idx = IEEE80211_FRAGMENT_MAX - 1;
968
969 entry = &sdata->fragments[idx];
970 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
971 entry->rx_queue != rx_queue ||
972 entry->last_frag + 1 != frag)
973 continue;
974
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700975 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +0200976
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700977 /*
978 * Check ftype and addresses are equal, else check next fragment
979 */
980 if (((hdr->frame_control ^ f_hdr->frame_control) &
981 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Johannes Berg571ecf62007-07-27 15:43:22 +0200982 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
983 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
984 continue;
985
S.Çağlar Onurab466232008-02-14 17:36:47 +0200986 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200987 __skb_queue_purge(&entry->skb_list);
988 continue;
989 }
990 return entry;
991 }
992
993 return NULL;
994}
995
Johannes Berg49461622008-06-30 15:10:45 +0200996static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100997ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200998{
999 struct ieee80211_hdr *hdr;
1000 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001001 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001002 unsigned int frag, seq;
1003 struct ieee80211_fragment_entry *entry;
1004 struct sk_buff *skb;
1005
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001006 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001007 fc = hdr->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02001008 sc = le16_to_cpu(hdr->seq_ctrl);
1009 frag = sc & IEEE80211_SCTL_FRAG;
1010
Harvey Harrison358c8d92008-07-15 18:44:13 -07001011 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001012 (rx->skb)->len < 24 ||
1013 is_multicast_ether_addr(hdr->addr1))) {
1014 /* not fragmented */
1015 goto out;
1016 }
1017 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1018
1019 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1020
1021 if (frag == 0) {
1022 /* This is the first fragment of a new frame. */
1023 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001024 rx->queue, &(rx->skb));
Johannes Berg8f20fc22007-08-28 17:01:54 -04001025 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
Harvey Harrison358c8d92008-07-15 18:44:13 -07001026 ieee80211_has_protected(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001027 /* Store CCMP PN so that we can verify that the next
1028 * fragment has a sequential PN value. */
1029 entry->ccmp = 1;
1030 memcpy(entry->last_pn,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001031 rx->key->u.ccmp.rx_pn[rx->queue],
Johannes Berg571ecf62007-07-27 15:43:22 +02001032 CCMP_PN_LEN);
1033 }
Johannes Berg9ae54c82008-01-31 19:48:20 +01001034 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001035 }
1036
1037 /* This is a fragment for a frame that should already be pending in
1038 * fragment cache. Add this fragment to the end of the pending entry.
1039 */
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001040 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001041 if (!entry) {
1042 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001043 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001044 }
1045
1046 /* Verify that MPDUs within one MSDU have sequential PN values.
1047 * (IEEE 802.11i, 8.3.3.4.5) */
1048 if (entry->ccmp) {
1049 int i;
1050 u8 pn[CCMP_PN_LEN], *rpn;
Johannes Berg8f20fc22007-08-28 17:01:54 -04001051 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001052 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001053 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1054 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1055 pn[i]++;
1056 if (pn[i])
1057 break;
1058 }
Johannes Berg5cf121c2008-02-25 16:27:43 +01001059 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001060 if (memcmp(pn, rpn, CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001061 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001062 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1063 }
1064
Harvey Harrison358c8d92008-07-15 18:44:13 -07001065 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +02001066 __skb_queue_tail(&entry->skb_list, rx->skb);
1067 entry->last_frag = frag;
1068 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001069 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001070 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001071 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001072 }
1073
1074 rx->skb = __skb_dequeue(&entry->skb_list);
1075 if (skb_tailroom(rx->skb) < entry->extra_len) {
1076 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1077 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1078 GFP_ATOMIC))) {
1079 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1080 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001081 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001082 }
1083 }
1084 while ((skb = __skb_dequeue(&entry->skb_list))) {
1085 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1086 dev_kfree_skb(skb);
1087 }
1088
1089 /* Complete frame has been reassembled - process it now */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001090 rx->flags |= IEEE80211_RX_FRAGMENTED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001091
1092 out:
1093 if (rx->sta)
1094 rx->sta->rx_packets++;
1095 if (is_multicast_ether_addr(hdr->addr1))
1096 rx->local->dot11MulticastReceivedFrameCount++;
1097 else
1098 ieee80211_led_rx(rx->local);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001099 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001100}
1101
Johannes Berg49461622008-06-30 15:10:45 +02001102static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001103ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001104{
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +02001105 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
Johannes Berg571ecf62007-07-27 15:43:22 +02001106 struct sk_buff *skb;
1107 int no_pending_pkts;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001108 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02001109
Harvey Harrison358c8d92008-07-15 18:44:13 -07001110 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
Johannes Berg5cf121c2008-02-25 16:27:43 +01001111 !(rx->flags & IEEE80211_RX_RA_MATCH)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001112 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001113
Johannes Berg05c914f2008-09-11 00:01:58 +02001114 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1115 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001116 return RX_DROP_UNUSABLE;
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +02001117
Johannes Berg571ecf62007-07-27 15:43:22 +02001118 skb = skb_dequeue(&rx->sta->tx_filtered);
1119 if (!skb) {
1120 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1121 if (skb)
1122 rx->local->total_ps_buffered--;
1123 }
1124 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1125 skb_queue_empty(&rx->sta->ps_tx_buf);
1126
1127 if (skb) {
1128 struct ieee80211_hdr *hdr =
1129 (struct ieee80211_hdr *) skb->data;
1130
Johannes Berg4a9a66e2008-02-19 11:31:14 +01001131 /*
1132 * Tell TX path to send one frame even though the STA may
1133 * still remain is PS mode after this frame exchange.
1134 */
Johannes Berg07346f812008-05-03 01:02:02 +02001135 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
Johannes Berg571ecf62007-07-27 15:43:22 +02001136
1137#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001138 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1139 rx->sta->sta.addr, rx->sta->sta.aid,
Johannes Berg571ecf62007-07-27 15:43:22 +02001140 skb_queue_len(&rx->sta->ps_tx_buf));
1141#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1142
1143 /* Use MoreData flag to indicate whether there are more
1144 * buffered frames for this STA */
Johannes Berg836341a2008-02-20 02:07:21 +01001145 if (no_pending_pkts)
Johannes Berg571ecf62007-07-27 15:43:22 +02001146 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
Johannes Berg836341a2008-02-20 02:07:21 +01001147 else
Johannes Berg571ecf62007-07-27 15:43:22 +02001148 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1149
1150 dev_queue_xmit(skb);
1151
Johannes Berg004c8722008-02-20 11:21:35 +01001152 if (no_pending_pkts)
1153 sta_info_clear_tim_bit(rx->sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001154#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg5cf121c2008-02-25 16:27:43 +01001155 } else if (!rx->sent_ps_buffered) {
Johannes Berg004c8722008-02-20 11:21:35 +01001156 /*
1157 * FIXME: This can be the result of a race condition between
1158 * us expiring a frame and the station polling for it.
1159 * Should we send it a null-func frame indicating we
1160 * have nothing buffered for it?
1161 */
Johannes Berg0c68ae262008-10-27 15:56:10 -07001162 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001163 "though there are no buffered frames for it\n",
Johannes Berg0c68ae262008-10-27 15:56:10 -07001164 rx->dev->name, rx->sta->sta.addr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001165#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg571ecf62007-07-27 15:43:22 +02001166 }
1167
Johannes Berg9ae54c82008-01-31 19:48:20 +01001168 /* Free PS Poll skb here instead of returning RX_DROP that would
Johannes Berg571ecf62007-07-27 15:43:22 +02001169 * count as an dropped frame. */
1170 dev_kfree_skb(rx->skb);
1171
Johannes Berg9ae54c82008-01-31 19:48:20 +01001172 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001173}
1174
Johannes Berg49461622008-06-30 15:10:45 +02001175static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001176ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +02001177{
Johannes Berg6e0d1142007-07-27 15:43:22 +02001178 u8 *data = rx->skb->data;
Harvey Harrison238f74a2008-07-02 11:05:34 -07001179 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001180
Harvey Harrison238f74a2008-07-02 11:05:34 -07001181 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001182 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001183
1184 /* remove the qos control field, update frame type and meta-data */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001185 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1186 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1187 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001188 /* change frame type to non QOS */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001189 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001190
Johannes Berg9ae54c82008-01-31 19:48:20 +01001191 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001192}
1193
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001194static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001195ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001196{
Johannes Berg07346f812008-05-03 01:02:02 +02001197 if (unlikely(!rx->sta ||
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001198 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001199 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001200
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001201 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001202}
1203
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001204static int
Harvey Harrison358c8d92008-07-15 18:44:13 -07001205ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02001206{
Johannes Berg3017b802007-08-28 17:01:53 -04001207 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001208 * Pass through unencrypted frames if the hardware has
1209 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001210 */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001211 if (rx->status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001212 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001213
1214 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001215 if (unlikely(!ieee80211_has_protected(fc) &&
1216 !ieee80211_is_nullfunc(fc) &&
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001217 ieee80211_is_data(fc) &&
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001218 (rx->key || rx->sdata->drop_unencrypted)))
1219 return -EACCES;
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001220 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1221 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1222 rx->key))
1223 return -EACCES;
1224 /* BIP does not use Protected field, so need to check MMIE */
1225 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb)
1226 && ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1227 rx->key))
1228 return -EACCES;
1229 /*
1230 * When using MFP, Action frames are not allowed prior to
1231 * having configured keys.
1232 */
1233 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1234 ieee80211_is_robust_mgmt_frame(
1235 (struct ieee80211_hdr *) rx->skb->data)))
1236 return -EACCES;
1237 }
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001238
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001239 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001240}
1241
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001242static int
Zhu Yie31a16d2009-05-21 21:47:03 +08001243__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001244{
1245 struct net_device *dev = rx->dev;
Johannes Berg571ecf62007-07-27 15:43:22 +02001246 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1247
Zhu Yie31a16d2009-05-21 21:47:03 +08001248 return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001249}
Johannes Berg571ecf62007-07-27 15:43:22 +02001250
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001251/*
1252 * requires that rx->skb is a frame with ethernet header
1253 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001254static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001255{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301256 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001257 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1258 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1259
1260 /*
1261 * Allow EAPOL frames to us/the PAE group address regardless
1262 * of whether the frame was encrypted or not.
1263 */
1264 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1265 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1266 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1267 return true;
1268
1269 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07001270 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001271 return false;
1272
1273 return true;
1274}
1275
1276/*
1277 * requires that rx->skb is a frame with ethernet header
1278 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001279static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01001280ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001281{
1282 struct net_device *dev = rx->dev;
1283 struct ieee80211_local *local = rx->local;
1284 struct sk_buff *skb, *xmit_skb;
1285 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001286 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1287 struct sta_info *dsta;
Johannes Berg571ecf62007-07-27 15:43:22 +02001288
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001289 skb = rx->skb;
1290 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001291
Johannes Berg05c914f2008-09-11 00:01:58 +02001292 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1293 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02001294 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +01001295 (rx->flags & IEEE80211_RX_RA_MATCH)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001296 if (is_multicast_ether_addr(ehdr->h_dest)) {
1297 /*
1298 * send multicast frames both to higher layers in
1299 * local net stack and back to the wireless medium
1300 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001301 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1302 if (!xmit_skb && net_ratelimit())
Johannes Berg571ecf62007-07-27 15:43:22 +02001303 printk(KERN_DEBUG "%s: failed to clone "
1304 "multicast frame\n", dev->name);
1305 } else {
Johannes Berg571ecf62007-07-27 15:43:22 +02001306 dsta = sta_info_get(local, skb->data);
Johannes Bergd0709a62008-02-25 16:27:46 +01001307 if (dsta && dsta->sdata->dev == dev) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001308 /*
1309 * The destination station is associated to
1310 * this AP (in this VLAN), so send the frame
1311 * directly to it and do not pass it to local
1312 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02001313 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001314 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001315 skb = NULL;
1316 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001317 }
1318 }
1319
1320 if (skb) {
Johannes Bergd1c3a372009-01-07 00:26:10 +01001321 int align __maybe_unused;
1322
1323#if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1324 /*
1325 * 'align' will only take the values 0 or 2 here
1326 * since all frames are required to be aligned
1327 * to 2-byte boundaries when being passed to
1328 * mac80211. That also explains the __skb_push()
1329 * below.
1330 */
matthieu castetdacb6f12009-06-04 22:16:18 +02001331 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01001332 if (align) {
1333 if (WARN_ON(skb_headroom(skb) < 3)) {
1334 dev_kfree_skb(skb);
1335 skb = NULL;
1336 } else {
1337 u8 *data = skb->data;
1338 size_t len = skb->len;
1339 u8 *new = __skb_push(skb, align);
1340 memmove(new, data, len);
1341 __skb_trim(skb, len);
1342 }
1343 }
1344#endif
1345
1346 if (skb) {
1347 /* deliver to local stack */
1348 skb->protocol = eth_type_trans(skb, dev);
1349 memset(skb->cb, 0, sizeof(skb->cb));
1350 netif_rx(skb);
1351 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001352 }
1353
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001354 if (xmit_skb) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001355 /* send to wireless media */
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09001356 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001357 skb_reset_network_header(xmit_skb);
1358 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001359 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001360 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001361}
1362
Johannes Berg49461622008-06-30 15:10:45 +02001363static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001364ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001365{
1366 struct net_device *dev = rx->dev;
1367 struct ieee80211_local *local = rx->local;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001368 u16 ethertype;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001369 u8 *payload;
1370 struct sk_buff *skb = rx->skb, *frame = NULL;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001371 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1372 __le16 fc = hdr->frame_control;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001373 const struct ethhdr *eth;
1374 int remaining, err;
1375 u8 dst[ETH_ALEN];
1376 u8 src[ETH_ALEN];
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001377
Harvey Harrison358c8d92008-07-15 18:44:13 -07001378 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001379 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001380
Harvey Harrison358c8d92008-07-15 18:44:13 -07001381 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001382 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001383
Johannes Berg5cf121c2008-02-25 16:27:43 +01001384 if (!(rx->flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001385 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001386
Zhu Yie31a16d2009-05-21 21:47:03 +08001387 err = __ieee80211_data_to_8023(rx);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001388 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001389 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001390
1391 skb->dev = dev;
1392
1393 dev->stats.rx_packets++;
1394 dev->stats.rx_bytes += skb->len;
1395
1396 /* skip the wrapping header */
1397 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1398 if (!eth)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001399 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001400
1401 while (skb != frame) {
1402 u8 padding;
1403 __be16 len = eth->h_proto;
1404 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1405
1406 remaining = skb->len;
1407 memcpy(dst, eth->h_dest, ETH_ALEN);
1408 memcpy(src, eth->h_source, ETH_ALEN);
1409
1410 padding = ((4 - subframe_len) & 0x3);
1411 /* the last MSDU has no padding */
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001412 if (subframe_len > remaining)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001413 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001414
1415 skb_pull(skb, sizeof(struct ethhdr));
1416 /* if last subframe reuse skb */
1417 if (remaining <= subframe_len + padding)
1418 frame = skb;
1419 else {
Johannes Bergd1c3a372009-01-07 00:26:10 +01001420 /*
1421 * Allocate and reserve two bytes more for payload
1422 * alignment since sizeof(struct ethhdr) is 14.
1423 */
1424 frame = dev_alloc_skb(
1425 ALIGN(local->hw.extra_tx_headroom, 4) +
1426 subframe_len + 2);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001427
1428 if (frame == NULL)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001429 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001430
Johannes Bergd1c3a372009-01-07 00:26:10 +01001431 skb_reserve(frame,
1432 ALIGN(local->hw.extra_tx_headroom, 4) +
1433 sizeof(struct ethhdr) + 2);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001434 memcpy(skb_put(frame, ntohs(len)), skb->data,
1435 ntohs(len));
1436
1437 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1438 padding);
1439 if (!eth) {
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001440 dev_kfree_skb(frame);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001441 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001442 }
1443 }
1444
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001445 skb_reset_network_header(frame);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001446 frame->dev = dev;
1447 frame->priority = skb->priority;
1448 rx->skb = frame;
1449
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001450 payload = frame->data;
1451 ethertype = (payload[6] << 8) | payload[7];
1452
1453 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001454 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1455 compare_ether_addr(payload,
1456 bridge_tunnel_header) == 0)) {
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001457 /* remove RFC1042 or Bridge-Tunnel
1458 * encapsulation and replace EtherType */
1459 skb_pull(frame, 6);
1460 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1461 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1462 } else {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001463 memcpy(skb_push(frame, sizeof(__be16)),
1464 &len, sizeof(__be16));
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001465 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1466 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1467 }
1468
Harvey Harrison358c8d92008-07-15 18:44:13 -07001469 if (!ieee80211_frame_allowed(rx, fc)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001470 if (skb == frame) /* last frame */
Johannes Berge4c26ad2008-01-31 19:48:21 +01001471 return RX_DROP_UNUSABLE;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001472 dev_kfree_skb(frame);
1473 continue;
1474 }
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001475
1476 ieee80211_deliver_skb(rx);
1477 }
1478
Johannes Berg9ae54c82008-01-31 19:48:20 +01001479 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001480}
1481
Ingo Molnarbf94e172008-10-12 23:51:38 -07001482#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02001483static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001484ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1485{
1486 struct ieee80211_hdr *hdr;
1487 struct ieee80211s_hdr *mesh_hdr;
1488 unsigned int hdrlen;
1489 struct sk_buff *skb = rx->skb, *fwd_skb;
1490
1491 hdr = (struct ieee80211_hdr *) skb->data;
1492 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1493 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1494
1495 if (!ieee80211_is_data(hdr->frame_control))
1496 return RX_CONTINUE;
1497
1498 if (!mesh_hdr->ttl)
1499 /* illegal frame */
1500 return RX_DROP_MONITOR;
1501
YanBo79617de2008-09-22 13:30:32 +08001502 if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){
1503 struct ieee80211_sub_if_data *sdata;
1504 struct mesh_path *mppath;
1505
1506 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1507 rcu_read_lock();
1508 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1509 if (!mppath) {
1510 mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1511 } else {
1512 spin_lock_bh(&mppath->state_lock);
1513 mppath->exp_time = jiffies;
1514 if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1515 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1516 spin_unlock_bh(&mppath->state_lock);
1517 }
1518 rcu_read_unlock();
1519 }
1520
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001521 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1522 return RX_CONTINUE;
1523
1524 mesh_hdr->ttl--;
1525
1526 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1527 if (!mesh_hdr->ttl)
Johannes Berg472dbc42008-09-11 00:01:49 +02001528 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001529 dropped_frames_ttl);
1530 else {
1531 struct ieee80211_hdr *fwd_hdr;
1532 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1533
1534 if (!fwd_skb && net_ratelimit())
1535 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1536 rx->dev->name);
1537
1538 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1539 /*
1540 * Save TA to addr1 to send TA a path error if a
1541 * suitable next hop is not found
1542 */
1543 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1544 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1545 fwd_skb->dev = rx->local->mdev;
1546 fwd_skb->iif = rx->dev->ifindex;
1547 dev_queue_xmit(fwd_skb);
1548 }
1549 }
1550
1551 if (is_multicast_ether_addr(hdr->addr3) ||
1552 rx->dev->flags & IFF_PROMISC)
1553 return RX_CONTINUE;
1554 else
1555 return RX_DROP_MONITOR;
1556}
Ingo Molnarbf94e172008-10-12 23:51:38 -07001557#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001558
1559static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001560ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001561{
1562 struct net_device *dev = rx->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001563 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1564 __le16 fc = hdr->frame_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001565 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001566
Harvey Harrison358c8d92008-07-15 18:44:13 -07001567 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001568 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001569
Harvey Harrison358c8d92008-07-15 18:44:13 -07001570 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001571 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001572
Zhu Yie31a16d2009-05-21 21:47:03 +08001573 err = __ieee80211_data_to_8023(rx);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001574 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001575 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001576
Harvey Harrison358c8d92008-07-15 18:44:13 -07001577 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001578 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001579
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001580 rx->skb->dev = dev;
1581
1582 dev->stats.rx_packets++;
1583 dev->stats.rx_bytes += rx->skb->len;
1584
1585 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02001586
Johannes Berg9ae54c82008-01-31 19:48:20 +01001587 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001588}
1589
Johannes Berg49461622008-06-30 15:10:45 +02001590static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001591ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
Ron Rindjunsky71364712007-12-25 17:00:36 +02001592{
1593 struct ieee80211_local *local = rx->local;
1594 struct ieee80211_hw *hw = &local->hw;
1595 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07001596 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001597 struct tid_ampdu_rx *tid_agg_rx;
1598 u16 start_seq_num;
1599 u16 tid;
1600
Harvey Harrisona7767f92008-07-02 16:30:51 -07001601 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001602 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001603
Harvey Harrisona7767f92008-07-02 16:30:51 -07001604 if (ieee80211_is_back_req(bar->frame_control)) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001605 if (!rx->sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001606 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001607 tid = le16_to_cpu(bar->control) >> 12;
Ron Rindjunskycee24a32008-03-26 20:36:03 +02001608 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1609 != HT_AGG_STATE_OPERATIONAL)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001610 return RX_CONTINUE;
Ron Rindjunskycee24a32008-03-26 20:36:03 +02001611 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
Ron Rindjunsky71364712007-12-25 17:00:36 +02001612
1613 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1614
1615 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01001616 if (tid_agg_rx->timeout)
1617 mod_timer(&tid_agg_rx->session_timer,
1618 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02001619
1620 /* manage reordering buffer according to requested */
1621 /* sequence number */
1622 rcu_read_lock();
Vasanthakumar Thiagarajanb3631282009-03-25 18:10:18 +05301623 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, NULL,
Ron Rindjunsky71364712007-12-25 17:00:36 +02001624 start_seq_num, 1);
1625 rcu_read_unlock();
Johannes Berge4c26ad2008-01-31 19:48:21 +01001626 return RX_DROP_UNUSABLE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001627 }
1628
Johannes Berg9ae54c82008-01-31 19:48:20 +01001629 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001630}
1631
Jouni Malinenf4f727a2009-01-10 11:46:53 +02001632static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1633 struct ieee80211_mgmt *mgmt,
1634 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02001635{
1636 struct ieee80211_local *local = sdata->local;
1637 struct sk_buff *skb;
1638 struct ieee80211_mgmt *resp;
1639
1640 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1641 /* Not to own unicast address */
1642 return;
1643 }
1644
Johannes Berg46900292009-02-15 12:44:28 +01001645 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1646 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
Jouni Malinenfea14732009-01-08 13:32:06 +02001647 /* Not from the current AP. */
1648 return;
1649 }
1650
Johannes Berg46900292009-02-15 12:44:28 +01001651 if (sdata->u.mgd.state == IEEE80211_STA_MLME_ASSOCIATE) {
Jouni Malinenfea14732009-01-08 13:32:06 +02001652 /* Association in progress; ignore SA Query */
1653 return;
1654 }
1655
1656 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1657 /* Too short SA Query request frame */
1658 return;
1659 }
1660
1661 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1662 if (skb == NULL)
1663 return;
1664
1665 skb_reserve(skb, local->hw.extra_tx_headroom);
1666 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1667 memset(resp, 0, 24);
1668 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1669 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01001670 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02001671 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1672 IEEE80211_STYPE_ACTION);
1673 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1674 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1675 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1676 memcpy(resp->u.action.u.sa_query.trans_id,
1677 mgmt->u.action.u.sa_query.trans_id,
1678 WLAN_SA_QUERY_TR_ID_LEN);
1679
1680 ieee80211_tx_skb(sdata, skb, 1);
1681}
1682
Johannes Berg49461622008-06-30 15:10:45 +02001683static ieee80211_rx_result debug_noinline
Johannes Bergde1ede72008-09-09 14:42:50 +02001684ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1685{
1686 struct ieee80211_local *local = rx->local;
1687 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1688 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Sujithc481ec92009-01-06 09:28:37 +05301689 struct ieee80211_bss *bss;
Johannes Bergde1ede72008-09-09 14:42:50 +02001690 int len = rx->skb->len;
1691
1692 if (!ieee80211_is_action(mgmt->frame_control))
1693 return RX_CONTINUE;
1694
1695 if (!rx->sta)
1696 return RX_DROP_MONITOR;
1697
1698 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1699 return RX_DROP_MONITOR;
1700
Jouni Malinen97ebe122009-01-08 13:32:08 +02001701 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1702 return RX_DROP_MONITOR;
1703
Johannes Bergde1ede72008-09-09 14:42:50 +02001704 /* all categories we currently handle have action_code */
1705 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1706 return RX_DROP_MONITOR;
1707
Johannes Bergde1ede72008-09-09 14:42:50 +02001708 switch (mgmt->u.action.category) {
1709 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01001710 /*
1711 * The aggregation code is not prepared to handle
1712 * anything but STA/AP due to the BSSID handling;
1713 * IBSS could work in the code but isn't supported
1714 * by drivers or the standard.
1715 */
1716 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1717 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1718 sdata->vif.type != NL80211_IFTYPE_AP)
1719 return RX_DROP_MONITOR;
1720
Johannes Bergde1ede72008-09-09 14:42:50 +02001721 switch (mgmt->u.action.u.addba_req.action_code) {
1722 case WLAN_ACTION_ADDBA_REQ:
1723 if (len < (IEEE80211_MIN_ACTION_SIZE +
1724 sizeof(mgmt->u.action.u.addba_req)))
1725 return RX_DROP_MONITOR;
1726 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1727 break;
1728 case WLAN_ACTION_ADDBA_RESP:
1729 if (len < (IEEE80211_MIN_ACTION_SIZE +
1730 sizeof(mgmt->u.action.u.addba_resp)))
1731 return RX_DROP_MONITOR;
1732 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1733 break;
1734 case WLAN_ACTION_DELBA:
1735 if (len < (IEEE80211_MIN_ACTION_SIZE +
1736 sizeof(mgmt->u.action.u.delba)))
1737 return RX_DROP_MONITOR;
1738 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1739 break;
1740 }
Johannes Berg39192c02008-09-09 14:49:03 +02001741 break;
1742 case WLAN_CATEGORY_SPECTRUM_MGMT:
1743 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1744 return RX_DROP_MONITOR;
Johannes Berg46900292009-02-15 12:44:28 +01001745
1746 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1747 return RX_DROP_MONITOR;
1748
Johannes Berg39192c02008-09-09 14:49:03 +02001749 switch (mgmt->u.action.u.measurement.action_code) {
1750 case WLAN_ACTION_SPCT_MSR_REQ:
1751 if (len < (IEEE80211_MIN_ACTION_SIZE +
1752 sizeof(mgmt->u.action.u.measurement)))
1753 return RX_DROP_MONITOR;
1754 ieee80211_process_measurement_req(sdata, mgmt, len);
1755 break;
Sujithc481ec92009-01-06 09:28:37 +05301756 case WLAN_ACTION_SPCT_CHL_SWITCH:
1757 if (len < (IEEE80211_MIN_ACTION_SIZE +
1758 sizeof(mgmt->u.action.u.chan_switch)))
1759 return RX_DROP_MONITOR;
1760
Johannes Bergcc32abd2009-05-15 11:52:31 +02001761 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1762 return RX_DROP_MONITOR;
1763
Johannes Berg46900292009-02-15 12:44:28 +01001764 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
Sujithc481ec92009-01-06 09:28:37 +05301765 return RX_DROP_MONITOR;
1766
Johannes Berg46900292009-02-15 12:44:28 +01001767 bss = ieee80211_rx_bss_get(local, sdata->u.mgd.bssid,
Sujithc481ec92009-01-06 09:28:37 +05301768 local->hw.conf.channel->center_freq,
Johannes Berg46900292009-02-15 12:44:28 +01001769 sdata->u.mgd.ssid,
1770 sdata->u.mgd.ssid_len);
Sujithc481ec92009-01-06 09:28:37 +05301771 if (!bss)
1772 return RX_DROP_MONITOR;
1773
Johannes Bergcc32abd2009-05-15 11:52:31 +02001774 ieee80211_sta_process_chanswitch(sdata,
Sujithc481ec92009-01-06 09:28:37 +05301775 &mgmt->u.action.u.chan_switch.sw_elem, bss);
1776 ieee80211_rx_bss_put(local, bss);
1777 break;
Johannes Berg39192c02008-09-09 14:49:03 +02001778 }
1779 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02001780 case WLAN_CATEGORY_SA_QUERY:
1781 if (len < (IEEE80211_MIN_ACTION_SIZE +
1782 sizeof(mgmt->u.action.u.sa_query)))
1783 return RX_DROP_MONITOR;
1784 switch (mgmt->u.action.u.sa_query.action) {
1785 case WLAN_ACTION_SA_QUERY_REQUEST:
1786 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1787 return RX_DROP_MONITOR;
1788 ieee80211_process_sa_query_req(sdata, mgmt, len);
1789 break;
1790 case WLAN_ACTION_SA_QUERY_RESPONSE:
1791 /*
1792 * SA Query response is currently only used in AP mode
1793 * and it is processed in user space.
1794 */
1795 return RX_CONTINUE;
1796 }
1797 break;
Johannes Berg39192c02008-09-09 14:49:03 +02001798 default:
1799 return RX_CONTINUE;
Johannes Bergde1ede72008-09-09 14:42:50 +02001800 }
1801
Johannes Berg39192c02008-09-09 14:49:03 +02001802 rx->sta->rx_packets++;
1803 dev_kfree_skb(rx->skb);
1804 return RX_QUEUED;
Johannes Bergde1ede72008-09-09 14:42:50 +02001805}
1806
1807static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001808ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001809{
Johannes Berg759ef3e2008-09-09 14:55:09 +02001810 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
Jouni Malinen97ebe122009-01-08 13:32:08 +02001811 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001812
Johannes Berg5cf121c2008-02-25 16:27:43 +01001813 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001814 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001815
Jouni Malinen97ebe122009-01-08 13:32:08 +02001816 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1817 return RX_DROP_MONITOR;
1818
Johannes Berg472dbc42008-09-11 00:01:49 +02001819 if (ieee80211_vif_is_mesh(&sdata->vif))
1820 return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status);
1821
Johannes Berg3832c282009-03-24 08:46:57 +01001822 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
Johannes Berg7986cf92009-03-21 17:08:43 +01001823 return ieee80211_ibss_rx_mgmt(sdata, rx->skb, rx->status);
Johannes Bergf9d540e2007-09-28 14:02:09 +02001824
Johannes Berg7986cf92009-03-21 17:08:43 +01001825 if (sdata->vif.type == NL80211_IFTYPE_STATION)
Johannes Berg46900292009-02-15 12:44:28 +01001826 return ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status);
Johannes Berg46900292009-02-15 12:44:28 +01001827
Johannes Berg7986cf92009-03-21 17:08:43 +01001828 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001829}
1830
Johannes Berg571ecf62007-07-27 15:43:22 +02001831static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1832 struct ieee80211_hdr *hdr,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001833 struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001834{
Harvey Harrisona7767f92008-07-02 16:30:51 -07001835 int keyidx;
1836 unsigned int hdrlen;
Johannes Berg571ecf62007-07-27 15:43:22 +02001837
Harvey Harrisona7767f92008-07-02 16:30:51 -07001838 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +02001839 if (rx->skb->len >= hdrlen + 4)
1840 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1841 else
1842 keyidx = -1;
1843
Johannes Berg8944b792008-01-31 19:48:26 +01001844 if (!rx->sta) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001845 /*
1846 * Some hardware seem to generate incorrect Michael MIC
1847 * reports; ignore them to avoid triggering countermeasures.
1848 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001849 goto ignore;
1850 }
1851
Harvey Harrisona7767f92008-07-02 16:30:51 -07001852 if (!ieee80211_has_protected(hdr->frame_control))
Johannes Berg571ecf62007-07-27 15:43:22 +02001853 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001854
Johannes Berg05c914f2008-09-11 00:01:58 +02001855 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001856 /*
1857 * APs with pairwise keys should never receive Michael MIC
1858 * errors for non-zero keyidx because these are reserved for
1859 * group keys and only the AP is sending real multicast
1860 * frames in the BSS.
1861 */
Johannes Bergeb063c12007-08-28 17:01:53 -04001862 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001863 }
1864
Harvey Harrisona7767f92008-07-02 16:30:51 -07001865 if (!ieee80211_is_data(hdr->frame_control) &&
1866 !ieee80211_is_auth(hdr->frame_control))
Johannes Berg571ecf62007-07-27 15:43:22 +02001867 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001868
Jouni Malinena3b8b052009-03-27 21:59:49 +02001869 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL);
Johannes Berg571ecf62007-07-27 15:43:22 +02001870 ignore:
1871 dev_kfree_skb(rx->skb);
1872 rx->skb = NULL;
1873}
1874
Johannes Berg5cf121c2008-02-25 16:27:43 +01001875/* TODO: use IEEE80211_RX_FRAGMENTED */
1876static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
Michael Wu3d30d942008-01-31 19:48:27 +01001877{
1878 struct ieee80211_sub_if_data *sdata;
1879 struct ieee80211_local *local = rx->local;
1880 struct ieee80211_rtap_hdr {
1881 struct ieee80211_radiotap_header hdr;
1882 u8 flags;
1883 u8 rate;
1884 __le16 chan_freq;
1885 __le16 chan_flags;
1886 } __attribute__ ((packed)) *rthdr;
1887 struct sk_buff *skb = rx->skb, *skb2;
1888 struct net_device *prev_dev = NULL;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001889 struct ieee80211_rx_status *status = rx->status;
Michael Wu3d30d942008-01-31 19:48:27 +01001890
Johannes Berg5cf121c2008-02-25 16:27:43 +01001891 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
Michael Wu3d30d942008-01-31 19:48:27 +01001892 goto out_free_skb;
1893
1894 if (skb_headroom(skb) < sizeof(*rthdr) &&
1895 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1896 goto out_free_skb;
1897
1898 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1899 memset(rthdr, 0, sizeof(*rthdr));
1900 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1901 rthdr->hdr.it_present =
1902 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1903 (1 << IEEE80211_RADIOTAP_RATE) |
1904 (1 << IEEE80211_RADIOTAP_CHANNEL));
1905
Johannes Berg5cf121c2008-02-25 16:27:43 +01001906 rthdr->rate = rx->rate->bitrate / 5;
Michael Wu3d30d942008-01-31 19:48:27 +01001907 rthdr->chan_freq = cpu_to_le16(status->freq);
1908
1909 if (status->band == IEEE80211_BAND_5GHZ)
1910 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1911 IEEE80211_CHAN_5GHZ);
1912 else
1913 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1914 IEEE80211_CHAN_2GHZ);
1915
1916 skb_set_mac_header(skb, 0);
1917 skb->ip_summed = CHECKSUM_UNNECESSARY;
1918 skb->pkt_type = PACKET_OTHERHOST;
1919 skb->protocol = htons(ETH_P_802_2);
1920
1921 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1922 if (!netif_running(sdata->dev))
1923 continue;
1924
Johannes Berg05c914f2008-09-11 00:01:58 +02001925 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Michael Wu3d30d942008-01-31 19:48:27 +01001926 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1927 continue;
1928
1929 if (prev_dev) {
1930 skb2 = skb_clone(skb, GFP_ATOMIC);
1931 if (skb2) {
1932 skb2->dev = prev_dev;
1933 netif_rx(skb2);
1934 }
1935 }
1936
1937 prev_dev = sdata->dev;
1938 sdata->dev->stats.rx_packets++;
1939 sdata->dev->stats.rx_bytes += skb->len;
1940 }
1941
1942 if (prev_dev) {
1943 skb->dev = prev_dev;
1944 netif_rx(skb);
1945 skb = NULL;
1946 } else
1947 goto out_free_skb;
1948
Johannes Berg5cf121c2008-02-25 16:27:43 +01001949 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
Michael Wu3d30d942008-01-31 19:48:27 +01001950 return;
1951
1952 out_free_skb:
1953 dev_kfree_skb(skb);
1954}
1955
Johannes Berg571ecf62007-07-27 15:43:22 +02001956
Johannes Berg8944b792008-01-31 19:48:26 +01001957static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001958 struct ieee80211_rx_data *rx,
Johannes Berg8944b792008-01-31 19:48:26 +01001959 struct sk_buff *skb)
Johannes Berg58905292008-01-31 19:48:25 +01001960{
Johannes Berg58905292008-01-31 19:48:25 +01001961 ieee80211_rx_result res = RX_DROP_MONITOR;
1962
Johannes Berg8944b792008-01-31 19:48:26 +01001963 rx->skb = skb;
1964 rx->sdata = sdata;
1965 rx->dev = sdata->dev;
1966
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001967#define CALL_RXH(rxh) \
1968 do { \
1969 res = rxh(rx); \
1970 if (res != RX_CONTINUE) \
1971 goto rxh_done; \
1972 } while (0);
Johannes Berg58905292008-01-31 19:48:25 +01001973
Johannes Berg49461622008-06-30 15:10:45 +02001974 CALL_RXH(ieee80211_rx_h_passive_scan)
1975 CALL_RXH(ieee80211_rx_h_check)
1976 CALL_RXH(ieee80211_rx_h_decrypt)
Kalle Valo572e0012009-02-10 17:09:31 +02001977 CALL_RXH(ieee80211_rx_h_check_more_data)
Johannes Berg49461622008-06-30 15:10:45 +02001978 CALL_RXH(ieee80211_rx_h_sta_process)
1979 CALL_RXH(ieee80211_rx_h_defragment)
1980 CALL_RXH(ieee80211_rx_h_ps_poll)
1981 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1982 /* must be after MMIC verify so header is counted in MPDU mic */
1983 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1984 CALL_RXH(ieee80211_rx_h_amsdu)
Ingo Molnarbf94e172008-10-12 23:51:38 -07001985#ifdef CONFIG_MAC80211_MESH
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001986 if (ieee80211_vif_is_mesh(&sdata->vif))
1987 CALL_RXH(ieee80211_rx_h_mesh_fwding);
Ingo Molnarbf94e172008-10-12 23:51:38 -07001988#endif
Johannes Berg49461622008-06-30 15:10:45 +02001989 CALL_RXH(ieee80211_rx_h_data)
1990 CALL_RXH(ieee80211_rx_h_ctrl)
Johannes Bergde1ede72008-09-09 14:42:50 +02001991 CALL_RXH(ieee80211_rx_h_action)
Johannes Berg49461622008-06-30 15:10:45 +02001992 CALL_RXH(ieee80211_rx_h_mgmt)
Johannes Berg58905292008-01-31 19:48:25 +01001993
Johannes Berg49461622008-06-30 15:10:45 +02001994#undef CALL_RXH
1995
1996 rxh_done:
Johannes Berg58905292008-01-31 19:48:25 +01001997 switch (res) {
Michael Wu3d30d942008-01-31 19:48:27 +01001998 case RX_DROP_MONITOR:
Johannes Berg49461622008-06-30 15:10:45 +02001999 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2000 if (rx->sta)
2001 rx->sta->rx_dropped++;
2002 /* fall through */
2003 case RX_CONTINUE:
Michael Wu3d30d942008-01-31 19:48:27 +01002004 ieee80211_rx_cooked_monitor(rx);
2005 break;
2006 case RX_DROP_UNUSABLE:
Johannes Berg49461622008-06-30 15:10:45 +02002007 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2008 if (rx->sta)
2009 rx->sta->rx_dropped++;
Johannes Berg58905292008-01-31 19:48:25 +01002010 dev_kfree_skb(rx->skb);
2011 break;
Johannes Berg49461622008-06-30 15:10:45 +02002012 case RX_QUEUED:
2013 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2014 break;
Johannes Berg58905292008-01-31 19:48:25 +01002015 }
2016}
2017
Johannes Berg571ecf62007-07-27 15:43:22 +02002018/* main receive path */
2019
Johannes Berg23a24de2007-07-27 15:43:22 +02002020static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg7ab17c42009-02-10 21:25:43 +01002021 struct ieee80211_rx_data *rx,
Johannes Berg23a24de2007-07-27 15:43:22 +02002022 struct ieee80211_hdr *hdr)
2023{
Johannes Berg7ab17c42009-02-10 21:25:43 +01002024 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02002025 int multicast = is_multicast_ether_addr(hdr->addr1);
2026
Johannes Berg51fb61e2007-12-19 01:31:27 +01002027 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02002028 case NL80211_IFTYPE_STATION:
Johannes Berg23a24de2007-07-27 15:43:22 +02002029 if (!bssid)
2030 return 0;
Johannes Berg46900292009-02-15 12:44:28 +01002031 if (!ieee80211_bssid_match(bssid, sdata->u.mgd.bssid)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01002032 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002033 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002034 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002035 } else if (!multicast &&
2036 compare_ether_addr(sdata->dev->dev_addr,
2037 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002038 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002039 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002040 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002041 }
2042 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002043 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02002044 if (!bssid)
2045 return 0;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002046 if (ieee80211_is_beacon(hdr->frame_control)) {
Bruno Randolf9d9bf772008-02-18 11:21:36 +09002047 return 1;
Vladimir Koutny87291c02008-06-13 16:50:44 +02002048 }
Johannes Berg46900292009-02-15 12:44:28 +01002049 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01002050 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002051 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002052 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002053 } else if (!multicast &&
2054 compare_ether_addr(sdata->dev->dev_addr,
2055 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002056 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002057 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002058 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002059 } else if (!rx->sta) {
2060 int rate_idx;
2061 if (rx->status->flag & RX_FLAG_HT)
2062 rate_idx = 0; /* TODO: HT rates */
2063 else
2064 rate_idx = rx->status->rate_idx;
Rami Rosenab1f5c02008-12-11 14:00:25 +02002065 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002066 BIT(rate_idx));
2067 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002068 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002069 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg6032f932008-02-23 15:17:07 +01002070 if (!multicast &&
2071 compare_ether_addr(sdata->dev->dev_addr,
2072 hdr->addr1) != 0) {
2073 if (!(sdata->dev->flags & IFF_PROMISC))
2074 return 0;
2075
Johannes Berg5cf121c2008-02-25 16:27:43 +01002076 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg6032f932008-02-23 15:17:07 +01002077 }
2078 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002079 case NL80211_IFTYPE_AP_VLAN:
2080 case NL80211_IFTYPE_AP:
Johannes Berg23a24de2007-07-27 15:43:22 +02002081 if (!bssid) {
2082 if (compare_ether_addr(sdata->dev->dev_addr,
2083 hdr->addr1))
2084 return 0;
2085 } else if (!ieee80211_bssid_match(bssid,
2086 sdata->dev->dev_addr)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01002087 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002088 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002089 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002090 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002091 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002092 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07002093 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02002094 return 0;
2095 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2096 return 0;
2097 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002098 case NL80211_IFTYPE_MONITOR:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02002099 /* take everything */
2100 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002101 case NL80211_IFTYPE_UNSPECIFIED:
2102 case __NL80211_IFTYPE_AFTER_LAST:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02002103 /* should never get here */
2104 WARN_ON(1);
2105 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02002106 }
2107
2108 return 1;
2109}
2110
Johannes Berg571ecf62007-07-27 15:43:22 +02002111/*
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002112 * This is the actual Rx frames handler. as it blongs to Rx path it must
2113 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02002114 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002115static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2116 struct sk_buff *skb,
2117 struct ieee80211_rx_status *status,
Johannes Berg8318d782008-01-24 19:38:38 +01002118 struct ieee80211_rate *rate)
Johannes Berg571ecf62007-07-27 15:43:22 +02002119{
2120 struct ieee80211_local *local = hw_to_local(hw);
2121 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002122 struct ieee80211_hdr *hdr;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002123 struct ieee80211_rx_data rx;
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002124 int prepares;
Johannes Berg8e6f00322007-07-27 15:43:22 +02002125 struct ieee80211_sub_if_data *prev = NULL;
2126 struct sk_buff *skb_new;
Johannes Berg571ecf62007-07-27 15:43:22 +02002127
Harvey Harrison358c8d92008-07-15 18:44:13 -07002128 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02002129 memset(&rx, 0, sizeof(rx));
2130 rx.skb = skb;
2131 rx.local = local;
2132
Johannes Berg5cf121c2008-02-25 16:27:43 +01002133 rx.status = status;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002134 rx.rate = rate;
Johannes Berg72abd812007-09-17 01:29:22 -04002135
Harvey Harrison358c8d92008-07-15 18:44:13 -07002136 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
Johannes Berg571ecf62007-07-27 15:43:22 +02002137 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02002138
Johannes Berg8944b792008-01-31 19:48:26 +01002139 rx.sta = sta_info_get(local, hdr->addr2);
2140 if (rx.sta) {
Johannes Bergd0709a62008-02-25 16:27:46 +01002141 rx.sdata = rx.sta->sdata;
2142 rx.dev = rx.sta->sdata->dev;
Johannes Bergb2e77712007-09-26 15:19:39 +02002143 }
Johannes Berg571ecf62007-07-27 15:43:22 +02002144
Johannes Berg571ecf62007-07-27 15:43:22 +02002145 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
Johannes Berg8944b792008-01-31 19:48:26 +01002146 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
Johannes Bergd0709a62008-02-25 16:27:46 +01002147 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002148 }
2149
Johannes Bergc2b13452008-09-11 00:01:55 +02002150 if (unlikely(local->sw_scanning || local->hw_scanning))
Johannes Berg5cf121c2008-02-25 16:27:43 +01002151 rx.flags |= IEEE80211_RX_IN_SCAN;
Johannes Berg571ecf62007-07-27 15:43:22 +02002152
Johannes Berg38f37142008-01-29 17:07:43 +01002153 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01002154 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01002155
Johannes Berg571ecf62007-07-27 15:43:22 +02002156 skb = rx.skb;
2157
Johannes Berg79010422007-09-18 17:29:21 -04002158 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg2a8a9a82007-08-28 17:01:52 -04002159 if (!netif_running(sdata->dev))
2160 continue;
2161
Johannes Berg05c914f2008-09-11 00:01:58 +02002162 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +02002163 continue;
2164
Johannes Berg5cf121c2008-02-25 16:27:43 +01002165 rx.flags |= IEEE80211_RX_RA_MATCH;
Johannes Berg7ab17c42009-02-10 21:25:43 +01002166 prepares = prepare_for_handlers(sdata, &rx, hdr);
Johannes Berg23a24de2007-07-27 15:43:22 +02002167
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002168 if (!prepares)
Johannes Berg23a24de2007-07-27 15:43:22 +02002169 continue;
Johannes Berg8e6f00322007-07-27 15:43:22 +02002170
Johannes Berg340e11f2007-07-27 15:43:22 +02002171 /*
2172 * frame is destined for this interface, but if it's not
2173 * also for the previous one we handle that after the
2174 * loop to avoid copying the SKB once too much
2175 */
2176
2177 if (!prev) {
2178 prev = sdata;
2179 continue;
Johannes Berg8e6f00322007-07-27 15:43:22 +02002180 }
Johannes Berg340e11f2007-07-27 15:43:22 +02002181
2182 /*
2183 * frame was destined for the previous interface
2184 * so invoke RX handlers for it
2185 */
2186
2187 skb_new = skb_copy(skb, GFP_ATOMIC);
2188 if (!skb_new) {
2189 if (net_ratelimit())
2190 printk(KERN_DEBUG "%s: failed to copy "
Pavel Roskina4278e12008-05-12 09:02:24 -04002191 "multicast frame for %s\n",
Johannes Bergdd1cd4c2007-09-18 17:29:20 -04002192 wiphy_name(local->hw.wiphy),
2193 prev->dev->name);
Johannes Berg340e11f2007-07-27 15:43:22 +02002194 continue;
2195 }
Johannes Berg8944b792008-01-31 19:48:26 +01002196 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
Johannes Berg8e6f00322007-07-27 15:43:22 +02002197 prev = sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002198 }
Harvey Harrisona4b7d7b2008-07-15 18:44:14 -07002199 if (prev)
Johannes Berg8944b792008-01-31 19:48:26 +01002200 ieee80211_invoke_rx_handlers(prev, &rx, skb);
Harvey Harrisona4b7d7b2008-07-15 18:44:14 -07002201 else
Johannes Berg8e6f00322007-07-27 15:43:22 +02002202 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002203}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002204
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002205#define SEQ_MODULO 0x1000
2206#define SEQ_MASK 0xfff
2207
2208static inline int seq_less(u16 sq1, u16 sq2)
2209{
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002210 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002211}
2212
2213static inline u16 seq_inc(u16 sq)
2214{
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002215 return (sq + 1) & SEQ_MASK;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002216}
2217
2218static inline u16 seq_sub(u16 sq1, u16 sq2)
2219{
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002220 return (sq1 - sq2) & SEQ_MASK;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002221}
2222
2223
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002224static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
2225 struct tid_ampdu_rx *tid_agg_rx,
2226 int index)
2227{
2228 struct ieee80211_supported_band *sband;
2229 struct ieee80211_rate *rate;
2230 struct ieee80211_rx_status status;
2231
2232 if (!tid_agg_rx->reorder_buf[index])
2233 goto no_frame;
2234
2235 /* release the reordered frames to stack */
2236 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb, sizeof(status));
2237 sband = hw->wiphy->bands[status.band];
2238 if (status.flag & RX_FLAG_HT)
2239 rate = sband->bitrates; /* TODO: HT rates */
2240 else
2241 rate = &sband->bitrates[status.rate_idx];
2242 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
2243 &status, rate);
2244 tid_agg_rx->stored_mpdu_num--;
2245 tid_agg_rx->reorder_buf[index] = NULL;
2246
2247no_frame:
2248 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2249}
2250
2251
Ron Rindjunsky71364712007-12-25 17:00:36 +02002252/*
Jouni Malinen4d050f12009-05-05 20:35:14 +03002253 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2254 * the skb was added to the buffer longer than this time ago, the earlier
2255 * frames that have not yet been received are assumed to be lost and the skb
2256 * can be released for processing. This may also release other skb's from the
2257 * reorder buffer if there are no additional gaps between the frames.
2258 */
2259#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2260
2261/*
Ron Rindjunsky71364712007-12-25 17:00:36 +02002262 * As it function blongs to Rx path it must be called with
2263 * the proper rcu_read_lock protection for its flow.
2264 */
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002265static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2266 struct tid_ampdu_rx *tid_agg_rx,
2267 struct sk_buff *skb,
Vasanthakumar Thiagarajanb3631282009-03-25 18:10:18 +05302268 struct ieee80211_rx_status *rxstatus,
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002269 u16 mpdu_seq_num,
2270 int bar_req)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002271{
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002272 u16 head_seq_num, buf_size;
2273 int index;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002274
2275 buf_size = tid_agg_rx->buf_size;
2276 head_seq_num = tid_agg_rx->head_seq_num;
2277
2278 /* frame with out of date sequence number */
2279 if (seq_less(mpdu_seq_num, head_seq_num)) {
2280 dev_kfree_skb(skb);
2281 return 1;
2282 }
2283
2284 /* if frame sequence number exceeds our buffering window size or
2285 * block Ack Request arrived - release stored frames */
2286 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2287 /* new head to the ordering buffer */
2288 if (bar_req)
2289 head_seq_num = mpdu_seq_num;
2290 else
2291 head_seq_num =
2292 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2293 /* release stored frames up to new head to stack */
2294 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2295 index = seq_sub(tid_agg_rx->head_seq_num,
2296 tid_agg_rx->ssn)
2297 % tid_agg_rx->buf_size;
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002298 ieee80211_release_reorder_frame(hw, tid_agg_rx,
2299 index);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002300 }
2301 if (bar_req)
2302 return 1;
2303 }
2304
2305 /* now the new frame is always in the range of the reordering */
2306 /* buffer window */
2307 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2308 % tid_agg_rx->buf_size;
2309 /* check if we already stored this frame */
2310 if (tid_agg_rx->reorder_buf[index]) {
2311 dev_kfree_skb(skb);
2312 return 1;
2313 }
2314
2315 /* if arrived mpdu is in the right order and nothing else stored */
2316 /* release it immediately */
2317 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2318 tid_agg_rx->stored_mpdu_num == 0) {
2319 tid_agg_rx->head_seq_num =
2320 seq_inc(tid_agg_rx->head_seq_num);
2321 return 0;
2322 }
2323
2324 /* put the frame in the reordering buffer */
2325 tid_agg_rx->reorder_buf[index] = skb;
Jouni Malinen4d050f12009-05-05 20:35:14 +03002326 tid_agg_rx->reorder_time[index] = jiffies;
Vasanthakumar Thiagarajanb3631282009-03-25 18:10:18 +05302327 memcpy(tid_agg_rx->reorder_buf[index]->cb, rxstatus,
2328 sizeof(*rxstatus));
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002329 tid_agg_rx->stored_mpdu_num++;
2330 /* release the buffer until next missing frame */
2331 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2332 % tid_agg_rx->buf_size;
Jouni Malinen4d050f12009-05-05 20:35:14 +03002333 if (!tid_agg_rx->reorder_buf[index] &&
2334 tid_agg_rx->stored_mpdu_num > 1) {
2335 /*
2336 * No buffers ready to be released, but check whether any
2337 * frames in the reorder buffer have timed out.
2338 */
2339 int j;
2340 int skipped = 1;
2341 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
2342 j = (j + 1) % tid_agg_rx->buf_size) {
2343 if (tid_agg_rx->reorder_buf[j] == NULL) {
2344 skipped++;
2345 continue;
2346 }
2347 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
2348 HZ / 10))
2349 break;
2350
2351#ifdef CONFIG_MAC80211_HT_DEBUG
2352 if (net_ratelimit())
2353 printk(KERN_DEBUG "%s: release an RX reorder "
2354 "frame due to timeout on earlier "
2355 "frames\n",
2356 wiphy_name(hw->wiphy));
2357#endif
2358 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
2359
2360 /*
2361 * Increment the head seq# also for the skipped slots.
2362 */
2363 tid_agg_rx->head_seq_num =
2364 (tid_agg_rx->head_seq_num + skipped) &
2365 SEQ_MASK;
2366 skipped = 0;
2367 }
2368 } else while (tid_agg_rx->reorder_buf[index]) {
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002369 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002370 index = seq_sub(tid_agg_rx->head_seq_num,
2371 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2372 }
2373 return 1;
2374}
2375
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002376static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
Vasanthakumar Thiagarajanb3631282009-03-25 18:10:18 +05302377 struct sk_buff *skb,
2378 struct ieee80211_rx_status *status)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002379{
2380 struct ieee80211_hw *hw = &local->hw;
2381 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2382 struct sta_info *sta;
2383 struct tid_ampdu_rx *tid_agg_rx;
Harvey Harrison87228f52008-06-11 14:21:59 -07002384 u16 sc;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002385 u16 mpdu_seq_num;
Harvey Harrison182503a2008-06-22 16:45:29 -07002386 u8 ret = 0;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002387 int tid;
2388
2389 sta = sta_info_get(local, hdr->addr2);
2390 if (!sta)
2391 return ret;
2392
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002393 /* filter the QoS data rx stream according to
2394 * STA/TID and check if this STA/TID is on aggregation */
Harvey Harrison87228f52008-06-11 14:21:59 -07002395 if (!ieee80211_is_data_qos(hdr->frame_control))
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002396 goto end_reorder;
2397
Harvey Harrison238f74a2008-07-02 11:05:34 -07002398 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002399
Ron Rindjunskycee24a32008-03-26 20:36:03 +02002400 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002401 goto end_reorder;
2402
Ron Rindjunskycee24a32008-03-26 20:36:03 +02002403 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2404
Emmanuel Grumbach2560b6e2008-07-10 00:47:19 +03002405 /* qos null data frames are excluded */
2406 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002407 goto end_reorder;
2408
2409 /* new un-ordered ampdu frame - process it */
2410
2411 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01002412 if (tid_agg_rx->timeout)
2413 mod_timer(&tid_agg_rx->session_timer,
2414 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002415
2416 /* if this mpdu is fragmented - terminate rx aggregation session */
2417 sc = le16_to_cpu(hdr->seq_ctrl);
2418 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Berg17741cd2008-09-11 00:02:02 +02002419 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002420 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2421 ret = 1;
2422 goto end_reorder;
2423 }
2424
2425 /* according to mpdu sequence number deal with reordering buffer */
2426 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
Vasanthakumar Thiagarajanb3631282009-03-25 18:10:18 +05302427 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, status,
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002428 mpdu_seq_num, 0);
Johannes Bergd0709a62008-02-25 16:27:46 +01002429 end_reorder:
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002430 return ret;
2431}
2432
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002433/*
2434 * This is the receive path handler. It is called by a low level driver when an
2435 * 802.11 MPDU is received from the hardware.
2436 */
2437void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2438 struct ieee80211_rx_status *status)
2439{
2440 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01002441 struct ieee80211_rate *rate = NULL;
2442 struct ieee80211_supported_band *sband;
2443
2444 if (status->band < 0 ||
Adrian Bunk13d8fd22008-04-23 12:51:28 +03002445 status->band >= IEEE80211_NUM_BANDS) {
Johannes Berg8318d782008-01-24 19:38:38 +01002446 WARN_ON(1);
2447 return;
2448 }
2449
2450 sband = local->hw.wiphy->bands[status->band];
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002451 if (!sband) {
Johannes Berg8318d782008-01-24 19:38:38 +01002452 WARN_ON(1);
2453 return;
2454 }
2455
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002456 if (status->flag & RX_FLAG_HT) {
2457 /* rate_idx is MCS index */
2458 if (WARN_ON(status->rate_idx < 0 ||
2459 status->rate_idx >= 76))
2460 return;
2461 /* HT rates are not in the table - use the highest legacy rate
2462 * for now since other parts of mac80211 may not yet be fully
2463 * MCS aware. */
2464 rate = &sband->bitrates[sband->n_bitrates - 1];
2465 } else {
2466 if (WARN_ON(status->rate_idx < 0 ||
2467 status->rate_idx >= sband->n_bitrates))
2468 return;
2469 rate = &sband->bitrates[status->rate_idx];
2470 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002471
2472 /*
2473 * key references and virtual interfaces are protected using RCU
2474 * and this requires that we are in a read-side RCU section during
2475 * receive processing
2476 */
2477 rcu_read_lock();
2478
2479 /*
2480 * Frames with failed FCS/PLCP checksum are not returned,
2481 * all other frames are returned without radiotap header
2482 * if it was previously present.
2483 * Also, frames with less than 16 bytes are dropped.
2484 */
Johannes Berg8318d782008-01-24 19:38:38 +01002485 skb = ieee80211_rx_monitor(local, skb, status, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002486 if (!skb) {
2487 rcu_read_unlock();
2488 return;
2489 }
2490
Jouni Malinenaec67952009-05-05 20:35:15 +03002491 /*
2492 * In theory, the block ack reordering should happen after duplicate
2493 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2494 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2495 * happen as a new RX handler between ieee80211_rx_h_check and
2496 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2497 * the time being, the call can be here since RX reorder buf processing
2498 * will implicitly skip duplicates. We could, in theory at least,
2499 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2500 * frames from other than operational channel), but that should not
2501 * happen in normal networks.
2502 */
Vasanthakumar Thiagarajanb3631282009-03-25 18:10:18 +05302503 if (!ieee80211_rx_reorder_ampdu(local, skb, status))
Johannes Berg9e72ebd2008-05-21 17:33:42 +02002504 __ieee80211_rx_handle_packet(hw, skb, status, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002505
2506 rcu_read_unlock();
2507}
Johannes Berg571ecf62007-07-27 15:43:22 +02002508EXPORT_SYMBOL(__ieee80211_rx);
2509
2510/* This is a version of the rx handler that can be called from hard irq
2511 * context. Post the skb on the queue and schedule the tasklet */
2512void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2513 struct ieee80211_rx_status *status)
2514{
2515 struct ieee80211_local *local = hw_to_local(hw);
2516
2517 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2518
2519 skb->dev = local->mdev;
2520 /* copy status into skb->cb for use by tasklet */
2521 memcpy(skb->cb, status, sizeof(*status));
2522 skb->pkt_type = IEEE80211_RX_MSG;
2523 skb_queue_tail(&local->skb_queue, skb);
2524 tasklet_schedule(&local->tasklet);
2525}
2526EXPORT_SYMBOL(ieee80211_rx_irqsafe);