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Johannes Berg571ecf62007-07-27 15:43:22 +02001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
S.Çağlar Onurab466232008-02-14 17:36:47 +020012#include <linux/jiffies.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020013#include <linux/kernel.h>
14#include <linux/skbuff.h>
15#include <linux/netdevice.h>
16#include <linux/etherdevice.h>
Johannes Bergd4e46a32007-09-14 11:10:24 -040017#include <linux/rcupdate.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020018#include <net/mac80211.h>
19#include <net/ieee80211_radiotap.h>
20
21#include "ieee80211_i.h"
Johannes 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,
33 u16 mpdu_seq_num,
34 int bar_req);
Johannes Bergb2e77712007-09-26 15:19:39 +020035/*
36 * monitor mode reception
37 *
38 * This function cleans up the SKB, i.e. it removes all the stuff
39 * only useful for monitoring.
40 */
41static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
42 struct sk_buff *skb,
43 int rtap_len)
44{
45 skb_pull(skb, rtap_len);
46
47 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
48 if (likely(skb->len > FCS_LEN))
49 skb_trim(skb, skb->len - FCS_LEN);
50 else {
51 /* driver bug */
52 WARN_ON(1);
53 dev_kfree_skb(skb);
54 skb = NULL;
55 }
56 }
57
58 return skb;
59}
60
Johannes Bergf1d58c22009-06-17 13:13:00 +020061static inline int should_drop_frame(struct sk_buff *skb,
Johannes Bergb2e77712007-09-26 15:19:39 +020062 int present_fcs_len,
63 int radiotap_len)
64{
Johannes Bergf1d58c22009-06-17 13:13:00 +020065 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Harvey Harrison182503a2008-06-22 16:45:29 -070066 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Bergb2e77712007-09-26 15:19:39 +020067
68 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
69 return 1;
70 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
71 return 1;
Harvey Harrison87228f52008-06-11 14:21:59 -070072 if (ieee80211_is_ctl(hdr->frame_control) &&
73 !ieee80211_is_pspoll(hdr->frame_control) &&
74 !ieee80211_is_back_req(hdr->frame_control))
Johannes Bergb2e77712007-09-26 15:19:39 +020075 return 1;
76 return 0;
77}
78
Bruno Randolf601ae7f2008-05-08 19:22:43 +020079static int
80ieee80211_rx_radiotap_len(struct ieee80211_local *local,
81 struct ieee80211_rx_status *status)
82{
83 int len;
84
85 /* always present fields */
86 len = sizeof(struct ieee80211_radiotap_header) + 9;
87
88 if (status->flag & RX_FLAG_TSFT)
89 len += 8;
Johannes Berg7fee5372009-01-30 11:13:06 +010090 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
Bruno Randolf601ae7f2008-05-08 19:22:43 +020091 len += 1;
92 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
93 len += 1;
94
95 if (len & 1) /* padding for RX_FLAGS if necessary */
96 len++;
97
98 /* make sure radiotap starts at a naturally aligned address */
99 if (len % 8)
100 len = roundup(len, 8);
101
102 return len;
103}
104
Johannes Bergd1c3a372009-01-07 00:26:10 +0100105/*
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200106 * ieee80211_add_rx_radiotap_header - add radiotap header
107 *
108 * add a radiotap header containing all the fields which the hardware provided.
109 */
110static void
111ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
112 struct sk_buff *skb,
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200113 struct ieee80211_rate *rate,
114 int rtap_len)
115{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200116 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200117 struct ieee80211_radiotap_header *rthdr;
118 unsigned char *pos;
119
120 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
121 memset(rthdr, 0, rtap_len);
122
123 /* radiotap header, set always present flags */
124 rthdr->it_present =
125 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200126 (1 << IEEE80211_RADIOTAP_CHANNEL) |
127 (1 << IEEE80211_RADIOTAP_ANTENNA) |
128 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
129 rthdr->it_len = cpu_to_le16(rtap_len);
130
131 pos = (unsigned char *)(rthdr+1);
132
133 /* the order of the following fields is important */
134
135 /* IEEE80211_RADIOTAP_TSFT */
136 if (status->flag & RX_FLAG_TSFT) {
137 *(__le64 *)pos = cpu_to_le64(status->mactime);
138 rthdr->it_present |=
139 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
140 pos += 8;
141 }
142
143 /* IEEE80211_RADIOTAP_FLAGS */
144 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
145 *pos |= IEEE80211_RADIOTAP_F_FCS;
Johannes Bergaae89832009-03-13 12:52:10 +0100146 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
147 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
Bruno Randolfb4f28bb2008-07-30 17:19:55 +0200148 if (status->flag & RX_FLAG_SHORTPRE)
149 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200150 pos++;
151
152 /* IEEE80211_RADIOTAP_RATE */
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200153 if (status->flag & RX_FLAG_HT) {
154 /*
155 * TODO: add following information into radiotap header once
156 * suitable fields are defined for it:
157 * - MCS index (status->rate_idx)
158 * - HT40 (status->flag & RX_FLAG_40MHZ)
159 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
160 */
161 *pos = 0;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200162 } else {
Jouni Malinenebe6c7b2009-01-10 11:47:33 +0200163 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200164 *pos = rate->bitrate / 5;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200165 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200166 pos++;
167
168 /* IEEE80211_RADIOTAP_CHANNEL */
169 *(__le16 *)pos = cpu_to_le16(status->freq);
170 pos += 2;
171 if (status->band == IEEE80211_BAND_5GHZ)
172 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
173 IEEE80211_CHAN_5GHZ);
Bruno Randolf9deb1ae2008-07-30 17:20:06 +0200174 else if (rate->flags & IEEE80211_RATE_ERP_G)
175 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
176 IEEE80211_CHAN_2GHZ);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200177 else
Bruno Randolf9deb1ae2008-07-30 17:20:06 +0200178 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK |
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200179 IEEE80211_CHAN_2GHZ);
180 pos += 2;
181
182 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
183 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
184 *pos = status->signal;
185 rthdr->it_present |=
186 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
187 pos++;
188 }
189
190 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
191 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
192 *pos = status->noise;
193 rthdr->it_present |=
194 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
195 pos++;
196 }
197
198 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
199
200 /* IEEE80211_RADIOTAP_ANTENNA */
201 *pos = status->antenna;
202 pos++;
203
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200204 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
205
206 /* IEEE80211_RADIOTAP_RX_FLAGS */
207 /* ensure 2 byte alignment for the 2 byte field as required */
208 if ((pos - (unsigned char *)rthdr) & 1)
209 pos++;
Johannes Bergaae89832009-03-13 12:52:10 +0100210 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
211 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADPLCP);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200212 pos += 2;
213}
214
Johannes Bergb2e77712007-09-26 15:19:39 +0200215/*
216 * This function copies a received frame to all monitor interfaces and
217 * returns a cleaned-up SKB that no longer includes the FCS nor the
218 * radiotap header the driver might have added.
219 */
220static struct sk_buff *
221ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
Johannes Berg8318d782008-01-24 19:38:38 +0100222 struct ieee80211_rate *rate)
Johannes Bergb2e77712007-09-26 15:19:39 +0200223{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200224 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200225 struct ieee80211_sub_if_data *sdata;
Johannes Bergb2e77712007-09-26 15:19:39 +0200226 int needed_headroom = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200227 struct sk_buff *skb, *skb2;
228 struct net_device *prev_dev = NULL;
229 int present_fcs_len = 0;
230 int rtap_len = 0;
231
232 /*
233 * First, we may need to make a copy of the skb because
234 * (1) we need to modify it for radiotap (if not present), and
235 * (2) the other RX handlers will modify the skb we got.
236 *
237 * We don't need to, of course, if we aren't going to return
238 * the SKB because it has a bad FCS/PLCP checksum.
239 */
240 if (status->flag & RX_FLAG_RADIOTAP)
241 rtap_len = ieee80211_get_radiotap_len(origskb->data);
242 else
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200243 /* room for the radiotap header based on driver features */
244 needed_headroom = ieee80211_rx_radiotap_len(local, status);
Johannes Bergb2e77712007-09-26 15:19:39 +0200245
246 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
247 present_fcs_len = FCS_LEN;
248
249 if (!local->monitors) {
Johannes Bergf1d58c22009-06-17 13:13:00 +0200250 if (should_drop_frame(origskb, present_fcs_len, rtap_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200251 dev_kfree_skb(origskb);
252 return NULL;
253 }
254
255 return remove_monitor_info(local, origskb, rtap_len);
256 }
257
Johannes Bergf1d58c22009-06-17 13:13:00 +0200258 if (should_drop_frame(origskb, present_fcs_len, rtap_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200259 /* only need to expand headroom if necessary */
260 skb = origskb;
261 origskb = NULL;
262
263 /*
264 * This shouldn't trigger often because most devices have an
265 * RX header they pull before we get here, and that should
266 * be big enough for our radiotap information. We should
267 * probably export the length to drivers so that we can have
268 * them allocate enough headroom to start with.
269 */
270 if (skb_headroom(skb) < needed_headroom &&
Johannes Bergc49e5ea2007-12-11 21:33:42 +0100271 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200272 dev_kfree_skb(skb);
273 return NULL;
274 }
275 } else {
276 /*
277 * Need to make a copy and possibly remove radiotap header
278 * and FCS from the original.
279 */
280 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
281
282 origskb = remove_monitor_info(local, origskb, rtap_len);
283
284 if (!skb)
285 return origskb;
286 }
287
288 /* if necessary, prepend radiotap information */
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200289 if (!(status->flag & RX_FLAG_RADIOTAP))
Johannes Bergf1d58c22009-06-17 13:13:00 +0200290 ieee80211_add_rx_radiotap_header(local, skb, rate,
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200291 needed_headroom);
Johannes Bergb2e77712007-09-26 15:19:39 +0200292
Johannes Bergce3edf6d02007-12-19 01:31:22 +0100293 skb_reset_mac_header(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200294 skb->ip_summed = CHECKSUM_UNNECESSARY;
295 skb->pkt_type = PACKET_OTHERHOST;
296 skb->protocol = htons(ETH_P_802_2);
297
298 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
299 if (!netif_running(sdata->dev))
300 continue;
301
Johannes Berg05c914f2008-09-11 00:01:58 +0200302 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +0200303 continue;
304
Michael Wu3d30d942008-01-31 19:48:27 +0100305 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
306 continue;
307
Johannes Bergb2e77712007-09-26 15:19:39 +0200308 if (prev_dev) {
309 skb2 = skb_clone(skb, GFP_ATOMIC);
310 if (skb2) {
311 skb2->dev = prev_dev;
312 netif_rx(skb2);
313 }
314 }
315
316 prev_dev = sdata->dev;
317 sdata->dev->stats.rx_packets++;
318 sdata->dev->stats.rx_bytes += skb->len;
319 }
320
321 if (prev_dev) {
322 skb->dev = prev_dev;
323 netif_rx(skb);
324 } else
325 dev_kfree_skb(skb);
326
327 return origskb;
328}
329
330
Johannes Berg5cf121c2008-02-25 16:27:43 +0100331static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200332{
Harvey Harrison238f74a2008-07-02 11:05:34 -0700333 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200334 int tid;
335
336 /* does the frame have a qos control field? */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700337 if (ieee80211_is_data_qos(hdr->frame_control)) {
338 u8 *qc = ieee80211_get_qos_ctl(hdr);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200339 /* frame has qos control */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700340 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
341 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
Johannes Berg5cf121c2008-02-25 16:27:43 +0100342 rx->flags |= IEEE80211_RX_AMSDU;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +0200343 else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100344 rx->flags &= ~IEEE80211_RX_AMSDU;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200345 } else {
Johannes Berg1411f9b2008-07-10 10:11:02 +0200346 /*
347 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
348 *
349 * Sequence numbers for management frames, QoS data
350 * frames with a broadcast/multicast address in the
351 * Address 1 field, and all non-QoS data frames sent
352 * by QoS STAs are assigned using an additional single
353 * modulo-4096 counter, [...]
354 *
355 * We also use that counter for non-QoS STAs.
356 */
357 tid = NUM_RX_DATA_QUEUES - 1;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200358 }
Johannes Berg52865df2007-07-27 15:43:22 +0200359
Johannes Berg5cf121c2008-02-25 16:27:43 +0100360 rx->queue = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200361 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
362 * For now, set skb->priority to 0 for other cases. */
363 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100364}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200365
Johannes Bergd1c3a372009-01-07 00:26:10 +0100366/**
367 * DOC: Packet alignment
368 *
369 * Drivers always need to pass packets that are aligned to two-byte boundaries
370 * to the stack.
371 *
372 * Additionally, should, if possible, align the payload data in a way that
373 * guarantees that the contained IP header is aligned to a four-byte
374 * boundary. In the case of regular frames, this simply means aligning the
375 * payload to a four-byte boundary (because either the IP header is directly
376 * contained, or IV/RFC1042 headers that have a length divisible by four are
377 * in front of it).
378 *
379 * With A-MSDU frames, however, the payload data address must yield two modulo
380 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
381 * push the IP header further back to a multiple of four again. Thankfully, the
382 * specs were sane enough this time around to require padding each A-MSDU
383 * subframe to a length that is a multiple of four.
384 *
385 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
386 * the payload is not supported, the driver is required to move the 802.11
387 * header to be directly in front of the payload in that case.
388 */
389static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
Johannes Berg38f37142008-01-29 17:07:43 +0100390{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700391 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg38f37142008-01-29 17:07:43 +0100392 int hdrlen;
393
Johannes Bergd1c3a372009-01-07 00:26:10 +0100394#ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
395 return;
396#endif
397
398 if (WARN_ONCE((unsigned long)rx->skb->data & 1,
399 "unaligned packet at 0x%p\n", rx->skb->data))
400 return;
401
Harvey Harrisona7767f92008-07-02 16:30:51 -0700402 if (!ieee80211_is_data_present(hdr->frame_control))
Johannes Berg38f37142008-01-29 17:07:43 +0100403 return;
404
Harvey Harrisona7767f92008-07-02 16:30:51 -0700405 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg5cf121c2008-02-25 16:27:43 +0100406 if (rx->flags & IEEE80211_RX_AMSDU)
Johannes Berg38f37142008-01-29 17:07:43 +0100407 hdrlen += ETH_HLEN;
Johannes Bergd1c3a372009-01-07 00:26:10 +0100408 WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3,
409 "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200410}
411
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +0200412
Johannes Berg571ecf62007-07-27 15:43:22 +0200413/* rx handlers */
414
Johannes Berg49461622008-06-30 15:10:45 +0200415static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100416ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200417{
418 struct ieee80211_local *local = rx->local;
419 struct sk_buff *skb = rx->skb;
420
Helmut Schaafbe9c422009-07-23 12:14:04 +0200421 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning)))
Johannes Bergf1d58c22009-06-17 13:13:00 +0200422 return ieee80211_scan_rx(rx->sdata, skb);
Zhu Yiece8edd2007-11-22 10:53:21 +0800423
Helmut Schaa142b9f52009-07-23 13:18:01 +0200424 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) &&
425 (rx->flags & IEEE80211_RX_IN_SCAN))) {
Zhu Yiece8edd2007-11-22 10:53:21 +0800426 /* drop all the other packets during a software scan anyway */
Johannes Bergf1d58c22009-06-17 13:13:00 +0200427 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
Zhu Yiece8edd2007-11-22 10:53:21 +0800428 dev_kfree_skb(skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100429 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200430 }
431
Johannes Berg5cf121c2008-02-25 16:27:43 +0100432 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200433 /* scanning finished during invoking of handlers */
434 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100435 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200436 }
437
Johannes Berg9ae54c82008-01-31 19:48:20 +0100438 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200439}
440
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200441
442static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
443{
444 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
445
446 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
447 return 0;
448
449 return ieee80211_is_robust_mgmt_frame(hdr);
450}
451
452
453static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
454{
455 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
456
457 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
458 return 0;
459
460 return ieee80211_is_robust_mgmt_frame(hdr);
461}
462
463
464/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
465static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
466{
467 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
468 struct ieee80211_mmie *mmie;
469
470 if (skb->len < 24 + sizeof(*mmie) ||
471 !is_multicast_ether_addr(hdr->da))
472 return -1;
473
474 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
475 return -1; /* not a robust management frame */
476
477 mmie = (struct ieee80211_mmie *)
478 (skb->data + skb->len - sizeof(*mmie));
479 if (mmie->element_id != WLAN_EID_MMIE ||
480 mmie->length != sizeof(*mmie) - 2)
481 return -1;
482
483 return le16_to_cpu(mmie->key_id);
484}
485
486
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100487static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100488ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100489{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700490 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
491 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
Javier Cardona3c5772a2009-08-10 12:15:48 -0700492 char *dev_addr = rx->dev->dev_addr;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100493
Harvey Harrisona7767f92008-07-02 16:30:51 -0700494 if (ieee80211_is_data(hdr->frame_control)) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700495 if (is_multicast_ether_addr(hdr->addr1)) {
496 if (ieee80211_has_tods(hdr->frame_control) ||
497 !ieee80211_has_fromds(hdr->frame_control))
498 return RX_DROP_MONITOR;
499 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
500 return RX_DROP_MONITOR;
501 } else {
502 if (!ieee80211_has_a4(hdr->frame_control))
503 return RX_DROP_MONITOR;
504 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
505 return RX_DROP_MONITOR;
506 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100507 }
508
509 /* If there is not an established peer link and this is not a peer link
510 * establisment frame, beacon or probe, drop the frame.
511 */
512
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800513 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100514 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100515
Harvey Harrisona7767f92008-07-02 16:30:51 -0700516 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100517 return RX_DROP_MONITOR;
518
Harvey Harrisona7767f92008-07-02 16:30:51 -0700519 if (ieee80211_is_action(hdr->frame_control)) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100520 mgmt = (struct ieee80211_mgmt *)hdr;
521 if (mgmt->u.action.category != PLINK_CATEGORY)
522 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100523 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100524 }
525
Harvey Harrisona7767f92008-07-02 16:30:51 -0700526 if (ieee80211_is_probe_req(hdr->frame_control) ||
527 ieee80211_is_probe_resp(hdr->frame_control) ||
528 ieee80211_is_beacon(hdr->frame_control))
529 return RX_CONTINUE;
530
531 return RX_DROP_MONITOR;
532
533 }
534
535#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
536
537 if (ieee80211_is_data(hdr->frame_control) &&
538 is_multicast_ether_addr(hdr->addr1) &&
Javier Cardona3c5772a2009-08-10 12:15:48 -0700539 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100540 return RX_DROP_MONITOR;
Johannes Berg902acc72008-02-23 15:17:19 +0100541#undef msh_h_get
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100542
Johannes Berg902acc72008-02-23 15:17:19 +0100543 return RX_CONTINUE;
544}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100545
546
Johannes Berg49461622008-06-30 15:10:45 +0200547static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100548ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200549{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700550 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +0200551
552 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
553 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700554 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100555 rx->sta->last_seq_ctrl[rx->queue] ==
Johannes Berg571ecf62007-07-27 15:43:22 +0200556 hdr->seq_ctrl)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +0100557 if (rx->flags & IEEE80211_RX_RA_MATCH) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200558 rx->local->dot11FrameDuplicateCount++;
559 rx->sta->num_duplicates++;
560 }
Johannes Berge4c26ad2008-01-31 19:48:21 +0100561 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200562 } else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100563 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +0200564 }
565
Johannes Berg571ecf62007-07-27 15:43:22 +0200566 if (unlikely(rx->skb->len < 16)) {
567 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100568 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200569 }
570
Johannes Berg571ecf62007-07-27 15:43:22 +0200571 /* Drop disallowed frame classes based on STA auth/assoc state;
572 * IEEE 802.11, Chap 5.5.
573 *
Johannes Bergccd7b362008-09-11 00:01:56 +0200574 * mac80211 filters only based on association state, i.e. it drops
575 * Class 3 frames from not associated stations. hostapd sends
Johannes Berg571ecf62007-07-27 15:43:22 +0200576 * deauth/disassoc frames when needed. In addition, hostapd is
577 * responsible for filtering on both auth and assoc states.
578 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100579
Johannes Berg902acc72008-02-23 15:17:19 +0100580 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100581 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100582
Harvey Harrisona7767f92008-07-02 16:30:51 -0700583 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
584 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200585 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Johannes Berg07346f812008-05-03 01:02:02 +0200586 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700587 if ((!ieee80211_has_fromds(hdr->frame_control) &&
588 !ieee80211_has_tods(hdr->frame_control) &&
589 ieee80211_is_data(hdr->frame_control)) ||
590 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200591 /* Drop IBSS frames and frames for other hosts
592 * silently. */
Johannes Berge4c26ad2008-01-31 19:48:21 +0100593 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200594 }
595
Johannes Berge4c26ad2008-01-31 19:48:21 +0100596 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200597 }
598
Johannes Berg9ae54c82008-01-31 19:48:20 +0100599 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +0200600}
601
602
Johannes Berg49461622008-06-30 15:10:45 +0200603static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100604ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
Johannes Berg570bd532007-07-27 15:43:22 +0200605{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700606 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg3017b802007-08-28 17:01:53 -0400607 int keyidx;
608 int hdrlen;
Johannes Berge4c26ad2008-01-31 19:48:21 +0100609 ieee80211_rx_result result = RX_DROP_UNUSABLE;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400610 struct ieee80211_key *stakey = NULL;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200611 int mmie_keyidx = -1;
Johannes Berg570bd532007-07-27 15:43:22 +0200612
Johannes Berg3017b802007-08-28 17:01:53 -0400613 /*
614 * Key selection 101
615 *
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200616 * There are four types of keys:
Johannes Berg3017b802007-08-28 17:01:53 -0400617 * - GTK (group keys)
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200618 * - IGTK (group keys for management frames)
Johannes Berg3017b802007-08-28 17:01:53 -0400619 * - PTK (pairwise keys)
620 * - STK (station-to-station pairwise keys)
621 *
622 * When selecting a key, we have to distinguish between multicast
623 * (including broadcast) and unicast frames, the latter can only
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200624 * use PTKs and STKs while the former always use GTKs and IGTKs.
625 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
626 * unicast frames can also use key indices like GTKs. Hence, if we
627 * don't have a PTK/STK we check the key index for a WEP key.
Johannes Berg3017b802007-08-28 17:01:53 -0400628 *
Johannes Berg8dc06a12007-08-28 17:01:55 -0400629 * Note that in a regular BSS, multicast frames are sent by the
630 * AP only, associated stations unicast the frame to the AP first
631 * which then multicasts it on their behalf.
632 *
Johannes Berg3017b802007-08-28 17:01:53 -0400633 * There is also a slight problem in IBSS mode: GTKs are negotiated
634 * with each station, that is something we don't currently handle.
Johannes Berg8dc06a12007-08-28 17:01:55 -0400635 * The spec seems to expect that one negotiates the same key with
636 * every station but there's no such requirement; VLANs could be
637 * possible.
Johannes Berg3017b802007-08-28 17:01:53 -0400638 */
Johannes Berg571ecf62007-07-27 15:43:22 +0200639
Johannes Berg3017b802007-08-28 17:01:53 -0400640 /*
Johannes Berg1990af82007-09-26 17:53:15 +0200641 * No point in finding a key and decrypting if the frame is neither
Johannes Berg3017b802007-08-28 17:01:53 -0400642 * addressed to us nor a multicast frame.
643 */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100644 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100645 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -0400646
Johannes Bergd4e46a32007-09-14 11:10:24 -0400647 if (rx->sta)
648 stakey = rcu_dereference(rx->sta->key);
649
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300650 if (!ieee80211_has_protected(hdr->frame_control))
651 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
652
Johannes Bergd4e46a32007-09-14 11:10:24 -0400653 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
654 rx->key = stakey;
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300655 /* Skip decryption if the frame is not protected. */
656 if (!ieee80211_has_protected(hdr->frame_control))
657 return RX_CONTINUE;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200658 } else if (mmie_keyidx >= 0) {
659 /* Broadcast/multicast robust management frame / BIP */
660 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
661 (rx->status->flag & RX_FLAG_IV_STRIPPED))
662 return RX_CONTINUE;
663
664 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
665 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
666 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
667 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300668 } else if (!ieee80211_has_protected(hdr->frame_control)) {
669 /*
670 * The frame was not protected, so skip decryption. However, we
671 * need to set rx->key if there is a key that could have been
672 * used so that the frame may be dropped if encryption would
673 * have been expected.
674 */
675 struct ieee80211_key *key = NULL;
676 if (ieee80211_is_mgmt(hdr->frame_control) &&
677 is_multicast_ether_addr(hdr->addr1) &&
678 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
679 rx->key = key;
680 else if ((key = rcu_dereference(rx->sdata->default_key)))
681 rx->key = key;
682 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200683 } else {
Johannes Berg3017b802007-08-28 17:01:53 -0400684 /*
685 * The device doesn't give us the IV so we won't be
686 * able to look up the key. That's ok though, we
687 * don't need to decrypt the frame, we just won't
688 * be able to keep statistics accurate.
689 * Except for key threshold notifications, should
690 * we somehow allow the driver to tell us which key
691 * the hardware used if this flag is set?
692 */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100693 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
694 (rx->status->flag & RX_FLAG_IV_STRIPPED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100695 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200696
Harvey Harrisona7767f92008-07-02 16:30:51 -0700697 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +0200698
Johannes Berg3017b802007-08-28 17:01:53 -0400699 if (rx->skb->len < 8 + hdrlen)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100700 return RX_DROP_UNUSABLE; /* TODO: count this? */
Johannes Berg571ecf62007-07-27 15:43:22 +0200701
Johannes Berg3017b802007-08-28 17:01:53 -0400702 /*
703 * no need to call ieee80211_wep_get_keyidx,
704 * it verifies a bunch of things we've done already
705 */
706 keyidx = rx->skb->data[hdrlen + 3] >> 6;
707
Johannes Bergd4e46a32007-09-14 11:10:24 -0400708 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
Johannes Berg3017b802007-08-28 17:01:53 -0400709
710 /*
711 * RSNA-protected unicast frames should always be sent with
712 * pairwise or station-to-station keys, but for WEP we allow
713 * using a key index as well.
714 */
Johannes Berg8f20fc22007-08-28 17:01:54 -0400715 if (rx->key && rx->key->conf.alg != ALG_WEP &&
Johannes Berg3017b802007-08-28 17:01:53 -0400716 !is_multicast_ether_addr(hdr->addr1))
717 rx->key = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +0200718 }
719
Johannes Berg3017b802007-08-28 17:01:53 -0400720 if (rx->key) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200721 rx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -0400722 /* TODO: add threshold stuff again */
Johannes Berg1990af82007-09-26 17:53:15 +0200723 } else {
Johannes Berge4c26ad2008-01-31 19:48:21 +0100724 return RX_DROP_MONITOR;
Johannes Berg70f08762007-09-26 17:53:14 +0200725 }
726
Johannes Berg1990af82007-09-26 17:53:15 +0200727 /* Check for weak IVs if possible */
728 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
Harvey Harrisona7767f92008-07-02 16:30:51 -0700729 ieee80211_is_data(hdr->frame_control) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100730 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
731 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
Johannes Berg1990af82007-09-26 17:53:15 +0200732 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
733 rx->sta->wep_weak_iv_count++;
734
Johannes Berg70f08762007-09-26 17:53:14 +0200735 switch (rx->key->conf.alg) {
736 case ALG_WEP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200737 result = ieee80211_crypto_wep_decrypt(rx);
738 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200739 case ALG_TKIP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200740 result = ieee80211_crypto_tkip_decrypt(rx);
741 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200742 case ALG_CCMP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200743 result = ieee80211_crypto_ccmp_decrypt(rx);
744 break;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200745 case ALG_AES_CMAC:
746 result = ieee80211_crypto_aes_cmac_decrypt(rx);
747 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200748 }
749
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200750 /* either the frame has been decrypted or will be dropped */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100751 rx->status->flag |= RX_FLAG_DECRYPTED;
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200752
753 return result;
Johannes Berg70f08762007-09-26 17:53:14 +0200754}
755
Kalle Valo572e0012009-02-10 17:09:31 +0200756static ieee80211_rx_result debug_noinline
757ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
758{
759 struct ieee80211_local *local;
760 struct ieee80211_hdr *hdr;
761 struct sk_buff *skb;
762
763 local = rx->local;
764 skb = rx->skb;
765 hdr = (struct ieee80211_hdr *) skb->data;
766
767 if (!local->pspolling)
768 return RX_CONTINUE;
769
770 if (!ieee80211_has_fromds(hdr->frame_control))
771 /* this is not from AP */
772 return RX_CONTINUE;
773
774 if (!ieee80211_is_data(hdr->frame_control))
775 return RX_CONTINUE;
776
777 if (!ieee80211_has_moredata(hdr->frame_control)) {
778 /* AP has no more frames buffered for us */
779 local->pspolling = false;
780 return RX_CONTINUE;
781 }
782
783 /* more data bit is set, let's request a new frame from the AP */
784 ieee80211_send_pspoll(local, rx->sdata);
785
786 return RX_CONTINUE;
787}
788
Johannes Berg133b8222008-09-16 14:18:59 +0200789static void ap_sta_ps_start(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +0200790{
Johannes Berg133b8222008-09-16 14:18:59 +0200791 struct ieee80211_sub_if_data *sdata = sta->sdata;
Christian Lamparter4571d3b2008-11-30 00:48:41 +0100792 struct ieee80211_local *local = sdata->local;
Joe Perches0795af52007-10-03 17:59:30 -0700793
Johannes Berg3e122be2008-07-09 14:40:34 +0200794 atomic_inc(&sdata->bss->num_sta_ps);
Johannes Berg3fa52052009-07-24 13:23:09 +0200795 set_sta_flags(sta, WLAN_STA_PS);
Johannes Berg24487982009-04-23 18:52:52 +0200796 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta);
Johannes Berg571ecf62007-07-27 15:43:22 +0200797#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700798 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
799 sdata->dev->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200800#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
801}
802
Johannes Berg133b8222008-09-16 14:18:59 +0200803static int ap_sta_ps_end(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +0200804{
Johannes Berg133b8222008-09-16 14:18:59 +0200805 struct ieee80211_sub_if_data *sdata = sta->sdata;
806 struct ieee80211_local *local = sdata->local;
Johannes Berg8f77f382009-06-07 21:58:37 +0200807 int sent, buffered;
Johannes Berg571ecf62007-07-27 15:43:22 +0200808
Johannes Berg3e122be2008-07-09 14:40:34 +0200809 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg004c8722008-02-20 11:21:35 +0100810
Johannes Berg3fa52052009-07-24 13:23:09 +0200811 clear_sta_flags(sta, WLAN_STA_PS);
Johannes Berg24487982009-04-23 18:52:52 +0200812 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta);
Johannes Berg004c8722008-02-20 11:21:35 +0100813
814 if (!skb_queue_empty(&sta->ps_tx_buf))
815 sta_info_clear_tim_bit(sta);
816
Johannes Berg571ecf62007-07-27 15:43:22 +0200817#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700818 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
819 sdata->dev->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200820#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg004c8722008-02-20 11:21:35 +0100821
Johannes Berg571ecf62007-07-27 15:43:22 +0200822 /* Send all buffered frames to the station */
Johannes Berg8f77f382009-06-07 21:58:37 +0200823 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
824 buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf);
825 sent += buffered;
826 local->total_ps_buffered -= buffered;
827
Johannes Berg571ecf62007-07-27 15:43:22 +0200828#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg8f77f382009-06-07 21:58:37 +0200829 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
830 "since STA not sleeping anymore\n", sdata->dev->name,
831 sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
Johannes Berg571ecf62007-07-27 15:43:22 +0200832#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg571ecf62007-07-27 15:43:22 +0200833
834 return sent;
835}
836
Johannes Berg49461622008-06-30 15:10:45 +0200837static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100838ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200839{
840 struct sta_info *sta = rx->sta;
Harvey Harrisona7767f92008-07-02 16:30:51 -0700841 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +0200842
843 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +0100844 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200845
Johannes Bergb291ba12009-07-10 15:29:03 +0200846 /*
847 * Update last_rx only for IBSS packets which are for the current
848 * BSSID to avoid keeping the current IBSS network alive in cases
849 * where other STAs start using different BSSID.
850 */
Johannes Berg05c914f2008-09-11 00:01:58 +0200851 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +0200852 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +0200853 NL80211_IFTYPE_ADHOC);
Johannes Berg46900292009-02-15 12:44:28 +0100854 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
Johannes Berg571ecf62007-07-27 15:43:22 +0200855 sta->last_rx = jiffies;
Johannes Bergb291ba12009-07-10 15:29:03 +0200856 } else if (!is_multicast_ether_addr(hdr->addr1)) {
857 /*
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100858 * Mesh beacons will update last_rx when if they are found to
859 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +0200860 */
Johannes Bergb291ba12009-07-10 15:29:03 +0200861 sta->last_rx = jiffies;
Johannes Berg571ecf62007-07-27 15:43:22 +0200862 }
863
Johannes Berg5cf121c2008-02-25 16:27:43 +0100864 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100865 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200866
Kalle Valo3cf335d2009-03-22 21:57:06 +0200867 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
868 ieee80211_sta_rx_notify(rx->sdata, hdr);
869
Johannes Berg571ecf62007-07-27 15:43:22 +0200870 sta->rx_fragments++;
871 sta->rx_bytes += rx->skb->len;
Johannes Berg5cf121c2008-02-25 16:27:43 +0100872 sta->last_signal = rx->status->signal;
Bruno Randolf566bfe52008-05-08 19:15:40 +0200873 sta->last_qual = rx->status->qual;
Johannes Berg5cf121c2008-02-25 16:27:43 +0100874 sta->last_noise = rx->status->noise;
Johannes Berg571ecf62007-07-27 15:43:22 +0200875
Johannes Berg72eaa432008-11-26 15:02:58 +0100876 /*
877 * Change STA power saving mode only at the end of a frame
878 * exchange sequence.
879 */
Johannes Berg3e122be2008-07-09 14:40:34 +0200880 if (!ieee80211_has_morefrags(hdr->frame_control) &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200881 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
882 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
Johannes Berg72eaa432008-11-26 15:02:58 +0100883 if (test_sta_flags(sta, WLAN_STA_PS)) {
884 /*
885 * Ignore doze->wake transitions that are
886 * indicated by non-data frames, the standard
887 * is unclear here, but for example going to
888 * PS mode and then scanning would cause a
889 * doze->wake transition for the probe request,
890 * and that is clearly undesirable.
891 */
892 if (ieee80211_is_data(hdr->frame_control) &&
893 !ieee80211_has_pm(hdr->frame_control))
894 rx->sent_ps_buffered += ap_sta_ps_end(sta);
895 } else {
896 if (ieee80211_has_pm(hdr->frame_control))
897 ap_sta_ps_start(sta);
898 }
Johannes Berg571ecf62007-07-27 15:43:22 +0200899 }
900
901 /* Drop data::nullfunc frames silently, since they are used only to
902 * control station power saving mode. */
Harvey Harrisona7767f92008-07-02 16:30:51 -0700903 if (ieee80211_is_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200904 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
905 /* Update counter and free packet here to avoid counting this
906 * as a dropped packed. */
907 sta->rx_packets++;
908 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100909 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200910 }
911
Johannes Berg9ae54c82008-01-31 19:48:20 +0100912 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200913} /* ieee80211_rx_h_sta_process */
914
Johannes Berg571ecf62007-07-27 15:43:22 +0200915static inline struct ieee80211_fragment_entry *
916ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
917 unsigned int frag, unsigned int seq, int rx_queue,
918 struct sk_buff **skb)
919{
920 struct ieee80211_fragment_entry *entry;
921 int idx;
922
923 idx = sdata->fragment_next;
924 entry = &sdata->fragments[sdata->fragment_next++];
925 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
926 sdata->fragment_next = 0;
927
928 if (!skb_queue_empty(&entry->skb_list)) {
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200929#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg571ecf62007-07-27 15:43:22 +0200930 struct ieee80211_hdr *hdr =
931 (struct ieee80211_hdr *) entry->skb_list.next->data;
932 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
933 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
Johannes Berg0c68ae262008-10-27 15:56:10 -0700934 "addr1=%pM addr2=%pM\n",
Johannes Berg571ecf62007-07-27 15:43:22 +0200935 sdata->dev->name, idx,
936 jiffies - entry->first_frag_time, entry->seq,
Johannes Berg0c68ae262008-10-27 15:56:10 -0700937 entry->last_frag, hdr->addr1, hdr->addr2);
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200938#endif
Johannes Berg571ecf62007-07-27 15:43:22 +0200939 __skb_queue_purge(&entry->skb_list);
940 }
941
942 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
943 *skb = NULL;
944 entry->first_frag_time = jiffies;
945 entry->seq = seq;
946 entry->rx_queue = rx_queue;
947 entry->last_frag = frag;
948 entry->ccmp = 0;
949 entry->extra_len = 0;
950
951 return entry;
952}
953
954static inline struct ieee80211_fragment_entry *
955ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700956 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +0200957 int rx_queue, struct ieee80211_hdr *hdr)
958{
959 struct ieee80211_fragment_entry *entry;
960 int i, idx;
961
962 idx = sdata->fragment_next;
963 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
964 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +0200965
966 idx--;
967 if (idx < 0)
968 idx = IEEE80211_FRAGMENT_MAX - 1;
969
970 entry = &sdata->fragments[idx];
971 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
972 entry->rx_queue != rx_queue ||
973 entry->last_frag + 1 != frag)
974 continue;
975
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700976 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +0200977
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700978 /*
979 * Check ftype and addresses are equal, else check next fragment
980 */
981 if (((hdr->frame_control ^ f_hdr->frame_control) &
982 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Johannes Berg571ecf62007-07-27 15:43:22 +0200983 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
984 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
985 continue;
986
S.Çağlar Onurab466232008-02-14 17:36:47 +0200987 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200988 __skb_queue_purge(&entry->skb_list);
989 continue;
990 }
991 return entry;
992 }
993
994 return NULL;
995}
996
Johannes Berg49461622008-06-30 15:10:45 +0200997static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100998ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200999{
1000 struct ieee80211_hdr *hdr;
1001 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001002 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001003 unsigned int frag, seq;
1004 struct ieee80211_fragment_entry *entry;
1005 struct sk_buff *skb;
1006
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001007 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001008 fc = hdr->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02001009 sc = le16_to_cpu(hdr->seq_ctrl);
1010 frag = sc & IEEE80211_SCTL_FRAG;
1011
Harvey Harrison358c8d92008-07-15 18:44:13 -07001012 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001013 (rx->skb)->len < 24 ||
1014 is_multicast_ether_addr(hdr->addr1))) {
1015 /* not fragmented */
1016 goto out;
1017 }
1018 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1019
1020 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1021
1022 if (frag == 0) {
1023 /* This is the first fragment of a new frame. */
1024 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001025 rx->queue, &(rx->skb));
Johannes Berg8f20fc22007-08-28 17:01:54 -04001026 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
Harvey Harrison358c8d92008-07-15 18:44:13 -07001027 ieee80211_has_protected(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001028 /* Store CCMP PN so that we can verify that the next
1029 * fragment has a sequential PN value. */
1030 entry->ccmp = 1;
1031 memcpy(entry->last_pn,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001032 rx->key->u.ccmp.rx_pn[rx->queue],
Johannes Berg571ecf62007-07-27 15:43:22 +02001033 CCMP_PN_LEN);
1034 }
Johannes Berg9ae54c82008-01-31 19:48:20 +01001035 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001036 }
1037
1038 /* This is a fragment for a frame that should already be pending in
1039 * fragment cache. Add this fragment to the end of the pending entry.
1040 */
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001041 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001042 if (!entry) {
1043 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001044 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001045 }
1046
1047 /* Verify that MPDUs within one MSDU have sequential PN values.
1048 * (IEEE 802.11i, 8.3.3.4.5) */
1049 if (entry->ccmp) {
1050 int i;
1051 u8 pn[CCMP_PN_LEN], *rpn;
Johannes Berg8f20fc22007-08-28 17:01:54 -04001052 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001053 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001054 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1055 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1056 pn[i]++;
1057 if (pn[i])
1058 break;
1059 }
Johannes Berg5cf121c2008-02-25 16:27:43 +01001060 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001061 if (memcmp(pn, rpn, CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001062 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001063 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1064 }
1065
Harvey Harrison358c8d92008-07-15 18:44:13 -07001066 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +02001067 __skb_queue_tail(&entry->skb_list, rx->skb);
1068 entry->last_frag = frag;
1069 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001070 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001071 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001072 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001073 }
1074
1075 rx->skb = __skb_dequeue(&entry->skb_list);
1076 if (skb_tailroom(rx->skb) < entry->extra_len) {
1077 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1078 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1079 GFP_ATOMIC))) {
1080 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1081 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001082 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001083 }
1084 }
1085 while ((skb = __skb_dequeue(&entry->skb_list))) {
1086 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1087 dev_kfree_skb(skb);
1088 }
1089
1090 /* Complete frame has been reassembled - process it now */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001091 rx->flags |= IEEE80211_RX_FRAGMENTED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001092
1093 out:
1094 if (rx->sta)
1095 rx->sta->rx_packets++;
1096 if (is_multicast_ether_addr(hdr->addr1))
1097 rx->local->dot11MulticastReceivedFrameCount++;
1098 else
1099 ieee80211_led_rx(rx->local);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001100 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001101}
1102
Johannes Berg49461622008-06-30 15:10:45 +02001103static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001104ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001105{
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +02001106 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
Johannes Berg571ecf62007-07-27 15:43:22 +02001107 struct sk_buff *skb;
1108 int no_pending_pkts;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001109 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02001110
Harvey Harrison358c8d92008-07-15 18:44:13 -07001111 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
Johannes Berg5cf121c2008-02-25 16:27:43 +01001112 !(rx->flags & IEEE80211_RX_RA_MATCH)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001113 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001114
Johannes Berg05c914f2008-09-11 00:01:58 +02001115 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1116 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001117 return RX_DROP_UNUSABLE;
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +02001118
Johannes Berg571ecf62007-07-27 15:43:22 +02001119 skb = skb_dequeue(&rx->sta->tx_filtered);
1120 if (!skb) {
1121 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1122 if (skb)
1123 rx->local->total_ps_buffered--;
1124 }
1125 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1126 skb_queue_empty(&rx->sta->ps_tx_buf);
1127
1128 if (skb) {
Johannes Berg3fa52052009-07-24 13:23:09 +02001129 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001130 struct ieee80211_hdr *hdr =
1131 (struct ieee80211_hdr *) skb->data;
1132
Johannes Berg4a9a66e2008-02-19 11:31:14 +01001133 /*
Johannes Berg3fa52052009-07-24 13:23:09 +02001134 * Tell TX path to send this frame even though the STA may
Johannes Berg4a9a66e2008-02-19 11:31:14 +01001135 * still remain is PS mode after this frame exchange.
1136 */
Johannes Berg3fa52052009-07-24 13:23:09 +02001137 info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001138
1139#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001140 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1141 rx->sta->sta.addr, rx->sta->sta.aid,
Johannes Berg571ecf62007-07-27 15:43:22 +02001142 skb_queue_len(&rx->sta->ps_tx_buf));
1143#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1144
1145 /* Use MoreData flag to indicate whether there are more
1146 * buffered frames for this STA */
Johannes Berg836341a2008-02-20 02:07:21 +01001147 if (no_pending_pkts)
Johannes Berg571ecf62007-07-27 15:43:22 +02001148 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
Johannes Berg836341a2008-02-20 02:07:21 +01001149 else
Johannes Berg571ecf62007-07-27 15:43:22 +02001150 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1151
Johannes Berg3fa52052009-07-24 13:23:09 +02001152 ieee80211_add_pending_skb(rx->local, skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001153
Johannes Berg004c8722008-02-20 11:21:35 +01001154 if (no_pending_pkts)
1155 sta_info_clear_tim_bit(rx->sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001156#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg5cf121c2008-02-25 16:27:43 +01001157 } else if (!rx->sent_ps_buffered) {
Johannes Berg004c8722008-02-20 11:21:35 +01001158 /*
1159 * FIXME: This can be the result of a race condition between
1160 * us expiring a frame and the station polling for it.
1161 * Should we send it a null-func frame indicating we
1162 * have nothing buffered for it?
1163 */
Johannes Berg0c68ae262008-10-27 15:56:10 -07001164 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001165 "though there are no buffered frames for it\n",
Johannes Berg0c68ae262008-10-27 15:56:10 -07001166 rx->dev->name, rx->sta->sta.addr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001167#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg571ecf62007-07-27 15:43:22 +02001168 }
1169
Johannes Berg9ae54c82008-01-31 19:48:20 +01001170 /* Free PS Poll skb here instead of returning RX_DROP that would
Johannes Berg571ecf62007-07-27 15:43:22 +02001171 * count as an dropped frame. */
1172 dev_kfree_skb(rx->skb);
1173
Johannes Berg9ae54c82008-01-31 19:48:20 +01001174 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001175}
1176
Johannes Berg49461622008-06-30 15:10:45 +02001177static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001178ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +02001179{
Johannes Berg6e0d1142007-07-27 15:43:22 +02001180 u8 *data = rx->skb->data;
Harvey Harrison238f74a2008-07-02 11:05:34 -07001181 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001182
Harvey Harrison238f74a2008-07-02 11:05:34 -07001183 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001184 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001185
1186 /* remove the qos control field, update frame type and meta-data */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001187 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1188 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1189 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001190 /* change frame type to non QOS */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001191 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001192
Johannes Berg9ae54c82008-01-31 19:48:20 +01001193 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001194}
1195
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001196static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001197ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001198{
Johannes Berg07346f812008-05-03 01:02:02 +02001199 if (unlikely(!rx->sta ||
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001200 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001201 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001202
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001203 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001204}
1205
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001206static int
Harvey Harrison358c8d92008-07-15 18:44:13 -07001207ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02001208{
Johannes Berg3017b802007-08-28 17:01:53 -04001209 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001210 * Pass through unencrypted frames if the hardware has
1211 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001212 */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001213 if (rx->status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001214 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001215
1216 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001217 if (unlikely(!ieee80211_has_protected(fc) &&
1218 !ieee80211_is_nullfunc(fc) &&
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001219 ieee80211_is_data(fc) &&
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +02001220 (rx->key || rx->sdata->drop_unencrypted)))
1221 return -EACCES;
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001222 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1223 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1224 rx->key))
1225 return -EACCES;
1226 /* BIP does not use Protected field, so need to check MMIE */
1227 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb)
1228 && ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1229 rx->key))
1230 return -EACCES;
1231 /*
1232 * When using MFP, Action frames are not allowed prior to
1233 * having configured keys.
1234 */
1235 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1236 ieee80211_is_robust_mgmt_frame(
1237 (struct ieee80211_hdr *) rx->skb->data)))
1238 return -EACCES;
1239 }
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001240
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001241 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001242}
1243
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001244static int
Zhu Yie31a16d2009-05-21 21:47:03 +08001245__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001246{
1247 struct net_device *dev = rx->dev;
Johannes Berg571ecf62007-07-27 15:43:22 +02001248 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1249
Zhu Yie31a16d2009-05-21 21:47:03 +08001250 return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001251}
Johannes Berg571ecf62007-07-27 15:43:22 +02001252
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001253/*
1254 * requires that rx->skb is a frame with ethernet header
1255 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001256static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001257{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301258 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001259 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1260 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1261
1262 /*
1263 * Allow EAPOL frames to us/the PAE group address regardless
1264 * of whether the frame was encrypted or not.
1265 */
1266 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1267 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1268 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1269 return true;
1270
1271 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07001272 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001273 return false;
1274
1275 return true;
1276}
1277
1278/*
1279 * requires that rx->skb is a frame with ethernet header
1280 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001281static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01001282ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001283{
1284 struct net_device *dev = rx->dev;
1285 struct ieee80211_local *local = rx->local;
1286 struct sk_buff *skb, *xmit_skb;
1287 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001288 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1289 struct sta_info *dsta;
Johannes Berg571ecf62007-07-27 15:43:22 +02001290
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001291 skb = rx->skb;
1292 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001293
Johannes Berg05c914f2008-09-11 00:01:58 +02001294 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1295 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02001296 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +01001297 (rx->flags & IEEE80211_RX_RA_MATCH)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001298 if (is_multicast_ether_addr(ehdr->h_dest)) {
1299 /*
1300 * send multicast frames both to higher layers in
1301 * local net stack and back to the wireless medium
1302 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001303 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1304 if (!xmit_skb && net_ratelimit())
Johannes Berg571ecf62007-07-27 15:43:22 +02001305 printk(KERN_DEBUG "%s: failed to clone "
1306 "multicast frame\n", dev->name);
1307 } else {
Johannes Berg571ecf62007-07-27 15:43:22 +02001308 dsta = sta_info_get(local, skb->data);
Johannes Bergd0709a62008-02-25 16:27:46 +01001309 if (dsta && dsta->sdata->dev == dev) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001310 /*
1311 * The destination station is associated to
1312 * this AP (in this VLAN), so send the frame
1313 * directly to it and do not pass it to local
1314 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02001315 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001316 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001317 skb = NULL;
1318 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001319 }
1320 }
1321
1322 if (skb) {
Johannes Bergd1c3a372009-01-07 00:26:10 +01001323 int align __maybe_unused;
1324
1325#if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1326 /*
1327 * 'align' will only take the values 0 or 2 here
1328 * since all frames are required to be aligned
1329 * to 2-byte boundaries when being passed to
1330 * mac80211. That also explains the __skb_push()
1331 * below.
1332 */
matthieu castetdacb6f12009-06-04 22:16:18 +02001333 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01001334 if (align) {
1335 if (WARN_ON(skb_headroom(skb) < 3)) {
1336 dev_kfree_skb(skb);
1337 skb = NULL;
1338 } else {
1339 u8 *data = skb->data;
1340 size_t len = skb->len;
1341 u8 *new = __skb_push(skb, align);
1342 memmove(new, data, len);
1343 __skb_trim(skb, len);
1344 }
1345 }
1346#endif
1347
1348 if (skb) {
1349 /* deliver to local stack */
1350 skb->protocol = eth_type_trans(skb, dev);
1351 memset(skb->cb, 0, sizeof(skb->cb));
1352 netif_rx(skb);
1353 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001354 }
1355
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001356 if (xmit_skb) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001357 /* send to wireless media */
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09001358 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001359 skb_reset_network_header(xmit_skb);
1360 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001361 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001362 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001363}
1364
Johannes Berg49461622008-06-30 15:10:45 +02001365static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001366ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001367{
1368 struct net_device *dev = rx->dev;
1369 struct ieee80211_local *local = rx->local;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001370 u16 ethertype;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001371 u8 *payload;
1372 struct sk_buff *skb = rx->skb, *frame = NULL;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001373 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1374 __le16 fc = hdr->frame_control;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001375 const struct ethhdr *eth;
1376 int remaining, err;
1377 u8 dst[ETH_ALEN];
1378 u8 src[ETH_ALEN];
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001379
Harvey Harrison358c8d92008-07-15 18:44:13 -07001380 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001381 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001382
Harvey Harrison358c8d92008-07-15 18:44:13 -07001383 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001384 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001385
Johannes Berg5cf121c2008-02-25 16:27:43 +01001386 if (!(rx->flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001387 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001388
Zhu Yie31a16d2009-05-21 21:47:03 +08001389 err = __ieee80211_data_to_8023(rx);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001390 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001391 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001392
1393 skb->dev = dev;
1394
1395 dev->stats.rx_packets++;
1396 dev->stats.rx_bytes += skb->len;
1397
1398 /* skip the wrapping header */
1399 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1400 if (!eth)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001401 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001402
1403 while (skb != frame) {
1404 u8 padding;
1405 __be16 len = eth->h_proto;
1406 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1407
1408 remaining = skb->len;
1409 memcpy(dst, eth->h_dest, ETH_ALEN);
1410 memcpy(src, eth->h_source, ETH_ALEN);
1411
1412 padding = ((4 - subframe_len) & 0x3);
1413 /* the last MSDU has no padding */
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001414 if (subframe_len > remaining)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001415 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001416
1417 skb_pull(skb, sizeof(struct ethhdr));
1418 /* if last subframe reuse skb */
1419 if (remaining <= subframe_len + padding)
1420 frame = skb;
1421 else {
Johannes Bergd1c3a372009-01-07 00:26:10 +01001422 /*
1423 * Allocate and reserve two bytes more for payload
1424 * alignment since sizeof(struct ethhdr) is 14.
1425 */
1426 frame = dev_alloc_skb(
1427 ALIGN(local->hw.extra_tx_headroom, 4) +
1428 subframe_len + 2);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001429
1430 if (frame == NULL)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001431 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001432
Johannes Bergd1c3a372009-01-07 00:26:10 +01001433 skb_reserve(frame,
1434 ALIGN(local->hw.extra_tx_headroom, 4) +
1435 sizeof(struct ethhdr) + 2);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001436 memcpy(skb_put(frame, ntohs(len)), skb->data,
1437 ntohs(len));
1438
1439 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1440 padding);
1441 if (!eth) {
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001442 dev_kfree_skb(frame);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001443 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001444 }
1445 }
1446
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001447 skb_reset_network_header(frame);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001448 frame->dev = dev;
1449 frame->priority = skb->priority;
1450 rx->skb = frame;
1451
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001452 payload = frame->data;
1453 ethertype = (payload[6] << 8) | payload[7];
1454
1455 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001456 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1457 compare_ether_addr(payload,
1458 bridge_tunnel_header) == 0)) {
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001459 /* remove RFC1042 or Bridge-Tunnel
1460 * encapsulation and replace EtherType */
1461 skb_pull(frame, 6);
1462 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1463 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1464 } else {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001465 memcpy(skb_push(frame, sizeof(__be16)),
1466 &len, sizeof(__be16));
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001467 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1468 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1469 }
1470
Harvey Harrison358c8d92008-07-15 18:44:13 -07001471 if (!ieee80211_frame_allowed(rx, fc)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001472 if (skb == frame) /* last frame */
Johannes Berge4c26ad2008-01-31 19:48:21 +01001473 return RX_DROP_UNUSABLE;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001474 dev_kfree_skb(frame);
1475 continue;
1476 }
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001477
1478 ieee80211_deliver_skb(rx);
1479 }
1480
Johannes Berg9ae54c82008-01-31 19:48:20 +01001481 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001482}
1483
Ingo Molnarbf94e172008-10-12 23:51:38 -07001484#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02001485static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001486ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1487{
1488 struct ieee80211_hdr *hdr;
1489 struct ieee80211s_hdr *mesh_hdr;
1490 unsigned int hdrlen;
1491 struct sk_buff *skb = rx->skb, *fwd_skb;
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001492 struct ieee80211_local *local = rx->local;
Javier Cardona249b4052009-07-07 10:55:03 -07001493 struct ieee80211_sub_if_data *sdata;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001494
1495 hdr = (struct ieee80211_hdr *) skb->data;
1496 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1497 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
Javier Cardona249b4052009-07-07 10:55:03 -07001498 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001499
1500 if (!ieee80211_is_data(hdr->frame_control))
1501 return RX_CONTINUE;
1502
1503 if (!mesh_hdr->ttl)
1504 /* illegal frame */
1505 return RX_DROP_MONITOR;
1506
Javier Cardona3c5772a2009-08-10 12:15:48 -07001507 if (!is_multicast_ether_addr(hdr->addr1) &&
1508 (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6)) {
YanBo79617de2008-09-22 13:30:32 +08001509 struct mesh_path *mppath;
1510
YanBo79617de2008-09-22 13:30:32 +08001511 rcu_read_lock();
1512 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1513 if (!mppath) {
1514 mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1515 } else {
1516 spin_lock_bh(&mppath->state_lock);
1517 mppath->exp_time = jiffies;
1518 if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1519 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1520 spin_unlock_bh(&mppath->state_lock);
1521 }
1522 rcu_read_unlock();
1523 }
1524
Javier Cardona3c5772a2009-08-10 12:15:48 -07001525 /* Frame has reached destination. Don't forward */
1526 if (!is_multicast_ether_addr(hdr->addr1) &&
1527 compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001528 return RX_CONTINUE;
1529
1530 mesh_hdr->ttl--;
1531
1532 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1533 if (!mesh_hdr->ttl)
Johannes Berg472dbc42008-09-11 00:01:49 +02001534 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001535 dropped_frames_ttl);
1536 else {
1537 struct ieee80211_hdr *fwd_hdr;
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001538 struct ieee80211_tx_info *info;
1539
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001540 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1541
1542 if (!fwd_skb && net_ratelimit())
1543 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1544 rx->dev->name);
1545
1546 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001547 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001548 info = IEEE80211_SKB_CB(fwd_skb);
1549 memset(info, 0, sizeof(*info));
1550 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
Johannes Berg5061b0c2009-07-14 00:33:34 +02001551 info->control.vif = &rx->sdata->vif;
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001552 ieee80211_select_queue(local, fwd_skb);
Daniel Walkerc8a61a72009-08-18 10:59:00 -07001553 if (is_multicast_ether_addr(fwd_hdr->addr1))
1554 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1555 fwded_mcast);
1556 else {
Javier Cardona3c5772a2009-08-10 12:15:48 -07001557 int err;
1558 /*
1559 * Save TA to addr1 to send TA a path error if a
1560 * suitable next hop is not found
1561 */
1562 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
Javier Cardona249b4052009-07-07 10:55:03 -07001563 ETH_ALEN);
Javier Cardona3c5772a2009-08-10 12:15:48 -07001564 err = mesh_nexthop_lookup(fwd_skb, sdata);
Javier Cardona249b4052009-07-07 10:55:03 -07001565 /* Failed to immediately resolve next hop:
1566 * fwded frame was dropped or will be added
1567 * later to the pending skb queue. */
1568 if (err)
1569 return RX_DROP_MONITOR;
Daniel Walkerc8a61a72009-08-18 10:59:00 -07001570
1571 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1572 fwded_unicast);
Javier Cardona249b4052009-07-07 10:55:03 -07001573 }
1574 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1575 fwded_frames);
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001576 ieee80211_add_pending_skb(local, fwd_skb);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001577 }
1578 }
1579
Javier Cardona3c5772a2009-08-10 12:15:48 -07001580 if (is_multicast_ether_addr(hdr->addr1) ||
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001581 rx->dev->flags & IFF_PROMISC)
1582 return RX_CONTINUE;
1583 else
1584 return RX_DROP_MONITOR;
1585}
Ingo Molnarbf94e172008-10-12 23:51:38 -07001586#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001587
1588static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001589ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001590{
1591 struct net_device *dev = rx->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001592 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1593 __le16 fc = hdr->frame_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001594 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001595
Harvey Harrison358c8d92008-07-15 18:44:13 -07001596 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001597 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001598
Harvey Harrison358c8d92008-07-15 18:44:13 -07001599 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001600 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001601
Zhu Yie31a16d2009-05-21 21:47:03 +08001602 err = __ieee80211_data_to_8023(rx);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001603 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001604 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001605
Harvey Harrison358c8d92008-07-15 18:44:13 -07001606 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001607 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001608
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001609 rx->skb->dev = dev;
1610
1611 dev->stats.rx_packets++;
1612 dev->stats.rx_bytes += rx->skb->len;
1613
1614 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02001615
Johannes Berg9ae54c82008-01-31 19:48:20 +01001616 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001617}
1618
Johannes Berg49461622008-06-30 15:10:45 +02001619static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001620ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
Ron Rindjunsky71364712007-12-25 17:00:36 +02001621{
1622 struct ieee80211_local *local = rx->local;
1623 struct ieee80211_hw *hw = &local->hw;
1624 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07001625 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001626 struct tid_ampdu_rx *tid_agg_rx;
1627 u16 start_seq_num;
1628 u16 tid;
1629
Harvey Harrisona7767f92008-07-02 16:30:51 -07001630 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001631 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001632
Harvey Harrisona7767f92008-07-02 16:30:51 -07001633 if (ieee80211_is_back_req(bar->frame_control)) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001634 if (!rx->sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001635 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001636 tid = le16_to_cpu(bar->control) >> 12;
Ron Rindjunskycee24a32008-03-26 20:36:03 +02001637 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1638 != HT_AGG_STATE_OPERATIONAL)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001639 return RX_CONTINUE;
Ron Rindjunskycee24a32008-03-26 20:36:03 +02001640 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
Ron Rindjunsky71364712007-12-25 17:00:36 +02001641
1642 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1643
1644 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01001645 if (tid_agg_rx->timeout)
1646 mod_timer(&tid_agg_rx->session_timer,
1647 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02001648
1649 /* manage reordering buffer according to requested */
1650 /* sequence number */
1651 rcu_read_lock();
Johannes Bergf1d58c22009-06-17 13:13:00 +02001652 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
Ron Rindjunsky71364712007-12-25 17:00:36 +02001653 start_seq_num, 1);
1654 rcu_read_unlock();
Johannes Berge4c26ad2008-01-31 19:48:21 +01001655 return RX_DROP_UNUSABLE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001656 }
1657
Johannes Berg9ae54c82008-01-31 19:48:20 +01001658 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001659}
1660
Jouni Malinenf4f727a2009-01-10 11:46:53 +02001661static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1662 struct ieee80211_mgmt *mgmt,
1663 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02001664{
1665 struct ieee80211_local *local = sdata->local;
1666 struct sk_buff *skb;
1667 struct ieee80211_mgmt *resp;
1668
1669 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1670 /* Not to own unicast address */
1671 return;
1672 }
1673
Johannes Berg46900292009-02-15 12:44:28 +01001674 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1675 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
Johannes Berg77fdaa12009-07-07 03:45:17 +02001676 /* Not from the current AP or not associated yet. */
Jouni Malinenfea14732009-01-08 13:32:06 +02001677 return;
1678 }
1679
1680 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1681 /* Too short SA Query request frame */
1682 return;
1683 }
1684
1685 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1686 if (skb == NULL)
1687 return;
1688
1689 skb_reserve(skb, local->hw.extra_tx_headroom);
1690 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1691 memset(resp, 0, 24);
1692 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1693 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01001694 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02001695 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1696 IEEE80211_STYPE_ACTION);
1697 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1698 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1699 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1700 memcpy(resp->u.action.u.sa_query.trans_id,
1701 mgmt->u.action.u.sa_query.trans_id,
1702 WLAN_SA_QUERY_TR_ID_LEN);
1703
1704 ieee80211_tx_skb(sdata, skb, 1);
1705}
1706
Johannes Berg49461622008-06-30 15:10:45 +02001707static ieee80211_rx_result debug_noinline
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001708ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1709{
1710 struct ieee80211_local *local = rx->local;
1711 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1712 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1713 int len = rx->skb->len;
1714
1715 if (!ieee80211_is_action(mgmt->frame_control))
1716 return RX_CONTINUE;
1717
1718 if (!rx->sta)
1719 return RX_DROP_MONITOR;
1720
1721 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1722 return RX_DROP_MONITOR;
1723
Jouni Malinen97ebe122009-01-08 13:32:08 +02001724 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1725 return RX_DROP_MONITOR;
1726
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001727 /* all categories we currently handle have action_code */
1728 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1729 return RX_DROP_MONITOR;
1730
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001731 switch (mgmt->u.action.category) {
1732 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01001733 /*
1734 * The aggregation code is not prepared to handle
1735 * anything but STA/AP due to the BSSID handling;
1736 * IBSS could work in the code but isn't supported
1737 * by drivers or the standard.
1738 */
1739 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1740 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1741 sdata->vif.type != NL80211_IFTYPE_AP)
1742 return RX_DROP_MONITOR;
1743
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001744 switch (mgmt->u.action.u.addba_req.action_code) {
1745 case WLAN_ACTION_ADDBA_REQ:
1746 if (len < (IEEE80211_MIN_ACTION_SIZE +
1747 sizeof(mgmt->u.action.u.addba_req)))
1748 return RX_DROP_MONITOR;
1749 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1750 break;
1751 case WLAN_ACTION_ADDBA_RESP:
1752 if (len < (IEEE80211_MIN_ACTION_SIZE +
1753 sizeof(mgmt->u.action.u.addba_resp)))
1754 return RX_DROP_MONITOR;
1755 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1756 break;
1757 case WLAN_ACTION_DELBA:
1758 if (len < (IEEE80211_MIN_ACTION_SIZE +
1759 sizeof(mgmt->u.action.u.delba)))
1760 return RX_DROP_MONITOR;
1761 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1762 break;
1763 }
Johannes Berg39192c02008-09-09 14:49:03 +02001764 break;
1765 case WLAN_CATEGORY_SPECTRUM_MGMT:
1766 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1767 return RX_DROP_MONITOR;
Johannes Berg46900292009-02-15 12:44:28 +01001768
1769 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1770 return RX_DROP_MONITOR;
1771
Johannes Berg39192c02008-09-09 14:49:03 +02001772 switch (mgmt->u.action.u.measurement.action_code) {
1773 case WLAN_ACTION_SPCT_MSR_REQ:
1774 if (len < (IEEE80211_MIN_ACTION_SIZE +
1775 sizeof(mgmt->u.action.u.measurement)))
1776 return RX_DROP_MONITOR;
1777 ieee80211_process_measurement_req(sdata, mgmt, len);
1778 break;
Sujithc481ec92009-01-06 09:28:37 +05301779 case WLAN_ACTION_SPCT_CHL_SWITCH:
1780 if (len < (IEEE80211_MIN_ACTION_SIZE +
1781 sizeof(mgmt->u.action.u.chan_switch)))
1782 return RX_DROP_MONITOR;
1783
Johannes Bergcc32abd2009-05-15 11:52:31 +02001784 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1785 return RX_DROP_MONITOR;
1786
Johannes Berg46900292009-02-15 12:44:28 +01001787 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
Sujithc481ec92009-01-06 09:28:37 +05301788 return RX_DROP_MONITOR;
1789
Johannes Berg77fdaa12009-07-07 03:45:17 +02001790 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
Johannes Berg39192c02008-09-09 14:49:03 +02001791 }
1792 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02001793 case WLAN_CATEGORY_SA_QUERY:
1794 if (len < (IEEE80211_MIN_ACTION_SIZE +
1795 sizeof(mgmt->u.action.u.sa_query)))
1796 return RX_DROP_MONITOR;
1797 switch (mgmt->u.action.u.sa_query.action) {
1798 case WLAN_ACTION_SA_QUERY_REQUEST:
1799 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1800 return RX_DROP_MONITOR;
1801 ieee80211_process_sa_query_req(sdata, mgmt, len);
1802 break;
1803 case WLAN_ACTION_SA_QUERY_RESPONSE:
1804 /*
1805 * SA Query response is currently only used in AP mode
1806 * and it is processed in user space.
1807 */
1808 return RX_CONTINUE;
1809 }
1810 break;
Johannes Berg39192c02008-09-09 14:49:03 +02001811 default:
1812 return RX_CONTINUE;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001813 }
1814
Johannes Berg39192c02008-09-09 14:49:03 +02001815 rx->sta->rx_packets++;
1816 dev_kfree_skb(rx->skb);
1817 return RX_QUEUED;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001818}
1819
1820static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001821ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001822{
Johannes Berg759ef3e2008-09-09 14:55:09 +02001823 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
Jouni Malinen97ebe122009-01-08 13:32:08 +02001824 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001825
Johannes Berg5cf121c2008-02-25 16:27:43 +01001826 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001827 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001828
Jouni Malinen97ebe122009-01-08 13:32:08 +02001829 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1830 return RX_DROP_MONITOR;
1831
Johannes Berg472dbc42008-09-11 00:01:49 +02001832 if (ieee80211_vif_is_mesh(&sdata->vif))
Johannes Bergf1d58c22009-06-17 13:13:00 +02001833 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
Johannes Berg472dbc42008-09-11 00:01:49 +02001834
Johannes Berg3832c282009-03-24 08:46:57 +01001835 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
Johannes Bergf1d58c22009-06-17 13:13:00 +02001836 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
Johannes Bergf9d540e2007-09-28 14:02:09 +02001837
Johannes Berg7986cf92009-03-21 17:08:43 +01001838 if (sdata->vif.type == NL80211_IFTYPE_STATION)
Johannes Bergf1d58c22009-06-17 13:13:00 +02001839 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
Johannes Berg46900292009-02-15 12:44:28 +01001840
Johannes Berg7986cf92009-03-21 17:08:43 +01001841 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001842}
1843
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001844static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001845 struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001846{
Harvey Harrisona7767f92008-07-02 16:30:51 -07001847 int keyidx;
1848 unsigned int hdrlen;
Johannes Berg571ecf62007-07-27 15:43:22 +02001849
Harvey Harrisona7767f92008-07-02 16:30:51 -07001850 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +02001851 if (rx->skb->len >= hdrlen + 4)
1852 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1853 else
1854 keyidx = -1;
1855
Johannes Berg8944b792008-01-31 19:48:26 +01001856 if (!rx->sta) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001857 /*
1858 * Some hardware seem to generate incorrect Michael MIC
1859 * reports; ignore them to avoid triggering countermeasures.
1860 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001861 goto ignore;
1862 }
1863
Harvey Harrisona7767f92008-07-02 16:30:51 -07001864 if (!ieee80211_has_protected(hdr->frame_control))
Johannes Berg571ecf62007-07-27 15:43:22 +02001865 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001866
Johannes Berg05c914f2008-09-11 00:01:58 +02001867 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001868 /*
1869 * APs with pairwise keys should never receive Michael MIC
1870 * errors for non-zero keyidx because these are reserved for
1871 * group keys and only the AP is sending real multicast
1872 * frames in the BSS.
1873 */
Johannes Bergeb063c12007-08-28 17:01:53 -04001874 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001875 }
1876
Harvey Harrisona7767f92008-07-02 16:30:51 -07001877 if (!ieee80211_is_data(hdr->frame_control) &&
1878 !ieee80211_is_auth(hdr->frame_control))
Johannes Berg571ecf62007-07-27 15:43:22 +02001879 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001880
Johannes Berge6d6e342009-07-01 21:26:47 +02001881 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
1882 GFP_ATOMIC);
Johannes Berg571ecf62007-07-27 15:43:22 +02001883 ignore:
1884 dev_kfree_skb(rx->skb);
1885 rx->skb = NULL;
1886}
1887
Johannes Berg5cf121c2008-02-25 16:27:43 +01001888/* TODO: use IEEE80211_RX_FRAGMENTED */
1889static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
Michael Wu3d30d942008-01-31 19:48:27 +01001890{
1891 struct ieee80211_sub_if_data *sdata;
1892 struct ieee80211_local *local = rx->local;
1893 struct ieee80211_rtap_hdr {
1894 struct ieee80211_radiotap_header hdr;
1895 u8 flags;
1896 u8 rate;
1897 __le16 chan_freq;
1898 __le16 chan_flags;
1899 } __attribute__ ((packed)) *rthdr;
1900 struct sk_buff *skb = rx->skb, *skb2;
1901 struct net_device *prev_dev = NULL;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001902 struct ieee80211_rx_status *status = rx->status;
Michael Wu3d30d942008-01-31 19:48:27 +01001903
Johannes Berg5cf121c2008-02-25 16:27:43 +01001904 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
Michael Wu3d30d942008-01-31 19:48:27 +01001905 goto out_free_skb;
1906
1907 if (skb_headroom(skb) < sizeof(*rthdr) &&
1908 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1909 goto out_free_skb;
1910
1911 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1912 memset(rthdr, 0, sizeof(*rthdr));
1913 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1914 rthdr->hdr.it_present =
1915 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1916 (1 << IEEE80211_RADIOTAP_RATE) |
1917 (1 << IEEE80211_RADIOTAP_CHANNEL));
1918
Johannes Berg5cf121c2008-02-25 16:27:43 +01001919 rthdr->rate = rx->rate->bitrate / 5;
Michael Wu3d30d942008-01-31 19:48:27 +01001920 rthdr->chan_freq = cpu_to_le16(status->freq);
1921
1922 if (status->band == IEEE80211_BAND_5GHZ)
1923 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1924 IEEE80211_CHAN_5GHZ);
1925 else
1926 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1927 IEEE80211_CHAN_2GHZ);
1928
1929 skb_set_mac_header(skb, 0);
1930 skb->ip_summed = CHECKSUM_UNNECESSARY;
1931 skb->pkt_type = PACKET_OTHERHOST;
1932 skb->protocol = htons(ETH_P_802_2);
1933
1934 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1935 if (!netif_running(sdata->dev))
1936 continue;
1937
Johannes Berg05c914f2008-09-11 00:01:58 +02001938 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Michael Wu3d30d942008-01-31 19:48:27 +01001939 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1940 continue;
1941
1942 if (prev_dev) {
1943 skb2 = skb_clone(skb, GFP_ATOMIC);
1944 if (skb2) {
1945 skb2->dev = prev_dev;
1946 netif_rx(skb2);
1947 }
1948 }
1949
1950 prev_dev = sdata->dev;
1951 sdata->dev->stats.rx_packets++;
1952 sdata->dev->stats.rx_bytes += skb->len;
1953 }
1954
1955 if (prev_dev) {
1956 skb->dev = prev_dev;
1957 netif_rx(skb);
1958 skb = NULL;
1959 } else
1960 goto out_free_skb;
1961
Johannes Berg5cf121c2008-02-25 16:27:43 +01001962 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
Michael Wu3d30d942008-01-31 19:48:27 +01001963 return;
1964
1965 out_free_skb:
1966 dev_kfree_skb(skb);
1967}
1968
Johannes Berg571ecf62007-07-27 15:43:22 +02001969
Johannes Berg8944b792008-01-31 19:48:26 +01001970static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001971 struct ieee80211_rx_data *rx,
Johannes Berg8944b792008-01-31 19:48:26 +01001972 struct sk_buff *skb)
Johannes Berg58905292008-01-31 19:48:25 +01001973{
Johannes Berg58905292008-01-31 19:48:25 +01001974 ieee80211_rx_result res = RX_DROP_MONITOR;
1975
Johannes Berg8944b792008-01-31 19:48:26 +01001976 rx->skb = skb;
1977 rx->sdata = sdata;
1978 rx->dev = sdata->dev;
1979
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001980#define CALL_RXH(rxh) \
1981 do { \
1982 res = rxh(rx); \
1983 if (res != RX_CONTINUE) \
1984 goto rxh_done; \
1985 } while (0);
Johannes Berg58905292008-01-31 19:48:25 +01001986
Johannes Berg49461622008-06-30 15:10:45 +02001987 CALL_RXH(ieee80211_rx_h_passive_scan)
1988 CALL_RXH(ieee80211_rx_h_check)
1989 CALL_RXH(ieee80211_rx_h_decrypt)
Kalle Valo572e0012009-02-10 17:09:31 +02001990 CALL_RXH(ieee80211_rx_h_check_more_data)
Johannes Berg49461622008-06-30 15:10:45 +02001991 CALL_RXH(ieee80211_rx_h_sta_process)
1992 CALL_RXH(ieee80211_rx_h_defragment)
1993 CALL_RXH(ieee80211_rx_h_ps_poll)
1994 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1995 /* must be after MMIC verify so header is counted in MPDU mic */
1996 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1997 CALL_RXH(ieee80211_rx_h_amsdu)
Ingo Molnarbf94e172008-10-12 23:51:38 -07001998#ifdef CONFIG_MAC80211_MESH
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001999 if (ieee80211_vif_is_mesh(&sdata->vif))
2000 CALL_RXH(ieee80211_rx_h_mesh_fwding);
Ingo Molnarbf94e172008-10-12 23:51:38 -07002001#endif
Johannes Berg49461622008-06-30 15:10:45 +02002002 CALL_RXH(ieee80211_rx_h_data)
2003 CALL_RXH(ieee80211_rx_h_ctrl)
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002004 CALL_RXH(ieee80211_rx_h_action)
Johannes Berg49461622008-06-30 15:10:45 +02002005 CALL_RXH(ieee80211_rx_h_mgmt)
Johannes Berg58905292008-01-31 19:48:25 +01002006
Johannes Berg49461622008-06-30 15:10:45 +02002007#undef CALL_RXH
2008
2009 rxh_done:
Johannes Berg58905292008-01-31 19:48:25 +01002010 switch (res) {
Michael Wu3d30d942008-01-31 19:48:27 +01002011 case RX_DROP_MONITOR:
Johannes Berg49461622008-06-30 15:10:45 +02002012 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2013 if (rx->sta)
2014 rx->sta->rx_dropped++;
2015 /* fall through */
2016 case RX_CONTINUE:
Michael Wu3d30d942008-01-31 19:48:27 +01002017 ieee80211_rx_cooked_monitor(rx);
2018 break;
2019 case RX_DROP_UNUSABLE:
Johannes Berg49461622008-06-30 15:10:45 +02002020 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2021 if (rx->sta)
2022 rx->sta->rx_dropped++;
Johannes Berg58905292008-01-31 19:48:25 +01002023 dev_kfree_skb(rx->skb);
2024 break;
Johannes Berg49461622008-06-30 15:10:45 +02002025 case RX_QUEUED:
2026 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2027 break;
Johannes Berg58905292008-01-31 19:48:25 +01002028 }
2029}
2030
Johannes Berg571ecf62007-07-27 15:43:22 +02002031/* main receive path */
2032
Johannes Berg23a24de2007-07-27 15:43:22 +02002033static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg7ab17c42009-02-10 21:25:43 +01002034 struct ieee80211_rx_data *rx,
Johannes Berg23a24de2007-07-27 15:43:22 +02002035 struct ieee80211_hdr *hdr)
2036{
Johannes Berg7ab17c42009-02-10 21:25:43 +01002037 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02002038 int multicast = is_multicast_ether_addr(hdr->addr1);
2039
Johannes Berg51fb61e2007-12-19 01:31:27 +01002040 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02002041 case NL80211_IFTYPE_STATION:
Johannes Berg23a24de2007-07-27 15:43:22 +02002042 if (!bssid)
2043 return 0;
Johannes Berg77fdaa12009-07-07 03:45:17 +02002044 if (!multicast &&
2045 compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002046 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002047 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002048 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002049 }
2050 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002051 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02002052 if (!bssid)
2053 return 0;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002054 if (ieee80211_is_beacon(hdr->frame_control)) {
Bruno Randolf9d9bf772008-02-18 11:21:36 +09002055 return 1;
Vladimir Koutny87291c02008-06-13 16:50:44 +02002056 }
Johannes Berg46900292009-02-15 12:44:28 +01002057 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01002058 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002059 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002060 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002061 } else if (!multicast &&
2062 compare_ether_addr(sdata->dev->dev_addr,
2063 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002064 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002065 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002066 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002067 } else if (!rx->sta) {
2068 int rate_idx;
2069 if (rx->status->flag & RX_FLAG_HT)
2070 rate_idx = 0; /* TODO: HT rates */
2071 else
2072 rate_idx = rx->status->rate_idx;
Rami Rosenab1f5c02008-12-11 14:00:25 +02002073 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002074 BIT(rate_idx));
2075 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002076 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002077 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg6032f932008-02-23 15:17:07 +01002078 if (!multicast &&
2079 compare_ether_addr(sdata->dev->dev_addr,
2080 hdr->addr1) != 0) {
2081 if (!(sdata->dev->flags & IFF_PROMISC))
2082 return 0;
2083
Johannes Berg5cf121c2008-02-25 16:27:43 +01002084 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg6032f932008-02-23 15:17:07 +01002085 }
2086 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002087 case NL80211_IFTYPE_AP_VLAN:
2088 case NL80211_IFTYPE_AP:
Johannes Berg23a24de2007-07-27 15:43:22 +02002089 if (!bssid) {
2090 if (compare_ether_addr(sdata->dev->dev_addr,
2091 hdr->addr1))
2092 return 0;
2093 } else if (!ieee80211_bssid_match(bssid,
2094 sdata->dev->dev_addr)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01002095 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002096 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002097 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002098 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002099 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002100 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07002101 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02002102 return 0;
2103 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2104 return 0;
2105 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002106 case NL80211_IFTYPE_MONITOR:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02002107 /* take everything */
2108 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002109 case NL80211_IFTYPE_UNSPECIFIED:
2110 case __NL80211_IFTYPE_AFTER_LAST:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02002111 /* should never get here */
2112 WARN_ON(1);
2113 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02002114 }
2115
2116 return 1;
2117}
2118
Johannes Berg571ecf62007-07-27 15:43:22 +02002119/*
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002120 * This is the actual Rx frames handler. as it blongs to Rx path it must
2121 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02002122 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002123static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2124 struct sk_buff *skb,
Johannes Berg8318d782008-01-24 19:38:38 +01002125 struct ieee80211_rate *rate)
Johannes Berg571ecf62007-07-27 15:43:22 +02002126{
Johannes Bergf1d58c22009-06-17 13:13:00 +02002127 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002128 struct ieee80211_local *local = hw_to_local(hw);
2129 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002130 struct ieee80211_hdr *hdr;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002131 struct ieee80211_rx_data rx;
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002132 int prepares;
Johannes Berg8e6f0032007-07-27 15:43:22 +02002133 struct ieee80211_sub_if_data *prev = NULL;
2134 struct sk_buff *skb_new;
Johannes Berg571ecf62007-07-27 15:43:22 +02002135
Harvey Harrison358c8d92008-07-15 18:44:13 -07002136 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02002137 memset(&rx, 0, sizeof(rx));
2138 rx.skb = skb;
2139 rx.local = local;
2140
Johannes Berg5cf121c2008-02-25 16:27:43 +01002141 rx.status = status;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002142 rx.rate = rate;
Johannes Berg72abd812007-09-17 01:29:22 -04002143
Harvey Harrison358c8d92008-07-15 18:44:13 -07002144 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
Johannes Berg571ecf62007-07-27 15:43:22 +02002145 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02002146
Johannes Berg8944b792008-01-31 19:48:26 +01002147 rx.sta = sta_info_get(local, hdr->addr2);
2148 if (rx.sta) {
Johannes Bergd0709a62008-02-25 16:27:46 +01002149 rx.sdata = rx.sta->sdata;
2150 rx.dev = rx.sta->sdata->dev;
Johannes Bergb2e77712007-09-26 15:19:39 +02002151 }
Johannes Berg571ecf62007-07-27 15:43:22 +02002152
Johannes Berg571ecf62007-07-27 15:43:22 +02002153 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
Johannes Berg3b8d81e2009-06-17 17:43:56 +02002154 ieee80211_rx_michael_mic_report(hdr, &rx);
Johannes Bergd0709a62008-02-25 16:27:46 +01002155 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002156 }
2157
Helmut Schaa142b9f52009-07-23 13:18:01 +02002158 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2159 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
Johannes Berg5cf121c2008-02-25 16:27:43 +01002160 rx.flags |= IEEE80211_RX_IN_SCAN;
Johannes Berg571ecf62007-07-27 15:43:22 +02002161
Johannes Berg38f37142008-01-29 17:07:43 +01002162 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01002163 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01002164
Johannes Berg571ecf62007-07-27 15:43:22 +02002165 skb = rx.skb;
2166
Johannes Berg79010422007-09-18 17:29:21 -04002167 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg2a8a9a82007-08-28 17:01:52 -04002168 if (!netif_running(sdata->dev))
2169 continue;
2170
Johannes Berg05c914f2008-09-11 00:01:58 +02002171 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +02002172 continue;
2173
Johannes Berg5cf121c2008-02-25 16:27:43 +01002174 rx.flags |= IEEE80211_RX_RA_MATCH;
Johannes Berg7ab17c42009-02-10 21:25:43 +01002175 prepares = prepare_for_handlers(sdata, &rx, hdr);
Johannes Berg23a24de2007-07-27 15:43:22 +02002176
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002177 if (!prepares)
Johannes Berg23a24de2007-07-27 15:43:22 +02002178 continue;
Johannes Berg8e6f0032007-07-27 15:43:22 +02002179
Johannes Berg340e11f2007-07-27 15:43:22 +02002180 /*
2181 * frame is destined for this interface, but if it's not
2182 * also for the previous one we handle that after the
2183 * loop to avoid copying the SKB once too much
2184 */
2185
2186 if (!prev) {
2187 prev = sdata;
2188 continue;
Johannes Berg8e6f0032007-07-27 15:43:22 +02002189 }
Johannes Berg340e11f2007-07-27 15:43:22 +02002190
2191 /*
2192 * frame was destined for the previous interface
2193 * so invoke RX handlers for it
2194 */
2195
2196 skb_new = skb_copy(skb, GFP_ATOMIC);
2197 if (!skb_new) {
2198 if (net_ratelimit())
2199 printk(KERN_DEBUG "%s: failed to copy "
Pavel Roskina4278e12008-05-12 09:02:24 -04002200 "multicast frame for %s\n",
Johannes Bergdd1cd4c2007-09-18 17:29:20 -04002201 wiphy_name(local->hw.wiphy),
2202 prev->dev->name);
Johannes Berg340e11f2007-07-27 15:43:22 +02002203 continue;
2204 }
Johannes Berg8944b792008-01-31 19:48:26 +01002205 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
Johannes Berg8e6f0032007-07-27 15:43:22 +02002206 prev = sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002207 }
Harvey Harrisona4b7d7b2008-07-15 18:44:14 -07002208 if (prev)
Johannes Berg8944b792008-01-31 19:48:26 +01002209 ieee80211_invoke_rx_handlers(prev, &rx, skb);
Harvey Harrisona4b7d7b2008-07-15 18:44:14 -07002210 else
Johannes Berg8e6f0032007-07-27 15:43:22 +02002211 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002212}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002213
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002214#define SEQ_MODULO 0x1000
2215#define SEQ_MASK 0xfff
2216
2217static inline int seq_less(u16 sq1, u16 sq2)
2218{
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002219 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002220}
2221
2222static inline u16 seq_inc(u16 sq)
2223{
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002224 return (sq + 1) & SEQ_MASK;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002225}
2226
2227static inline u16 seq_sub(u16 sq1, u16 sq2)
2228{
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002229 return (sq1 - sq2) & SEQ_MASK;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002230}
2231
2232
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002233static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
2234 struct tid_ampdu_rx *tid_agg_rx,
2235 int index)
2236{
2237 struct ieee80211_supported_band *sband;
2238 struct ieee80211_rate *rate;
Johannes Bergf1d58c22009-06-17 13:13:00 +02002239 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
2240 struct ieee80211_rx_status *status;
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002241
Johannes Bergf1d58c22009-06-17 13:13:00 +02002242 if (!skb)
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002243 goto no_frame;
2244
Johannes Bergf1d58c22009-06-17 13:13:00 +02002245 status = IEEE80211_SKB_RXCB(skb);
2246
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002247 /* release the reordered frames to stack */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002248 sband = hw->wiphy->bands[status->band];
2249 if (status->flag & RX_FLAG_HT)
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002250 rate = sband->bitrates; /* TODO: HT rates */
2251 else
Johannes Bergf1d58c22009-06-17 13:13:00 +02002252 rate = &sband->bitrates[status->rate_idx];
2253 __ieee80211_rx_handle_packet(hw, skb, rate);
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002254 tid_agg_rx->stored_mpdu_num--;
2255 tid_agg_rx->reorder_buf[index] = NULL;
2256
2257no_frame:
2258 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2259}
2260
2261
Ron Rindjunsky71364712007-12-25 17:00:36 +02002262/*
Jouni Malinen4d050f12009-05-05 20:35:14 +03002263 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2264 * the skb was added to the buffer longer than this time ago, the earlier
2265 * frames that have not yet been received are assumed to be lost and the skb
2266 * can be released for processing. This may also release other skb's from the
2267 * reorder buffer if there are no additional gaps between the frames.
2268 */
2269#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2270
2271/*
Ron Rindjunsky71364712007-12-25 17:00:36 +02002272 * As it function blongs to Rx path it must be called with
2273 * the proper rcu_read_lock protection for its flow.
2274 */
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002275static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2276 struct tid_ampdu_rx *tid_agg_rx,
2277 struct sk_buff *skb,
2278 u16 mpdu_seq_num,
2279 int bar_req)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002280{
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002281 u16 head_seq_num, buf_size;
2282 int index;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002283
2284 buf_size = tid_agg_rx->buf_size;
2285 head_seq_num = tid_agg_rx->head_seq_num;
2286
2287 /* frame with out of date sequence number */
2288 if (seq_less(mpdu_seq_num, head_seq_num)) {
2289 dev_kfree_skb(skb);
2290 return 1;
2291 }
2292
2293 /* if frame sequence number exceeds our buffering window size or
2294 * block Ack Request arrived - release stored frames */
2295 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2296 /* new head to the ordering buffer */
2297 if (bar_req)
2298 head_seq_num = mpdu_seq_num;
2299 else
2300 head_seq_num =
2301 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2302 /* release stored frames up to new head to stack */
2303 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2304 index = seq_sub(tid_agg_rx->head_seq_num,
2305 tid_agg_rx->ssn)
2306 % tid_agg_rx->buf_size;
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002307 ieee80211_release_reorder_frame(hw, tid_agg_rx,
2308 index);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002309 }
2310 if (bar_req)
2311 return 1;
2312 }
2313
2314 /* now the new frame is always in the range of the reordering */
2315 /* buffer window */
2316 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2317 % tid_agg_rx->buf_size;
2318 /* check if we already stored this frame */
2319 if (tid_agg_rx->reorder_buf[index]) {
2320 dev_kfree_skb(skb);
2321 return 1;
2322 }
2323
2324 /* if arrived mpdu is in the right order and nothing else stored */
2325 /* release it immediately */
2326 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2327 tid_agg_rx->stored_mpdu_num == 0) {
2328 tid_agg_rx->head_seq_num =
2329 seq_inc(tid_agg_rx->head_seq_num);
2330 return 0;
2331 }
2332
2333 /* put the frame in the reordering buffer */
2334 tid_agg_rx->reorder_buf[index] = skb;
Jouni Malinen4d050f12009-05-05 20:35:14 +03002335 tid_agg_rx->reorder_time[index] = jiffies;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002336 tid_agg_rx->stored_mpdu_num++;
2337 /* release the buffer until next missing frame */
2338 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2339 % tid_agg_rx->buf_size;
Jouni Malinen4d050f12009-05-05 20:35:14 +03002340 if (!tid_agg_rx->reorder_buf[index] &&
2341 tid_agg_rx->stored_mpdu_num > 1) {
2342 /*
2343 * No buffers ready to be released, but check whether any
2344 * frames in the reorder buffer have timed out.
2345 */
2346 int j;
2347 int skipped = 1;
2348 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
2349 j = (j + 1) % tid_agg_rx->buf_size) {
2350 if (tid_agg_rx->reorder_buf[j] == NULL) {
2351 skipped++;
2352 continue;
2353 }
2354 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
2355 HZ / 10))
2356 break;
2357
2358#ifdef CONFIG_MAC80211_HT_DEBUG
2359 if (net_ratelimit())
2360 printk(KERN_DEBUG "%s: release an RX reorder "
2361 "frame due to timeout on earlier "
2362 "frames\n",
2363 wiphy_name(hw->wiphy));
2364#endif
2365 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
2366
2367 /*
2368 * Increment the head seq# also for the skipped slots.
2369 */
2370 tid_agg_rx->head_seq_num =
2371 (tid_agg_rx->head_seq_num + skipped) &
2372 SEQ_MASK;
2373 skipped = 0;
2374 }
2375 } else while (tid_agg_rx->reorder_buf[index]) {
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002376 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002377 index = seq_sub(tid_agg_rx->head_seq_num,
2378 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2379 }
2380 return 1;
2381}
2382
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002383static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
Johannes Bergf1d58c22009-06-17 13:13:00 +02002384 struct sk_buff *skb)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002385{
2386 struct ieee80211_hw *hw = &local->hw;
2387 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2388 struct sta_info *sta;
2389 struct tid_ampdu_rx *tid_agg_rx;
Harvey Harrison87228f52008-06-11 14:21:59 -07002390 u16 sc;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002391 u16 mpdu_seq_num;
Harvey Harrison182503a2008-06-22 16:45:29 -07002392 u8 ret = 0;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002393 int tid;
2394
2395 sta = sta_info_get(local, hdr->addr2);
2396 if (!sta)
2397 return ret;
2398
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002399 /* filter the QoS data rx stream according to
2400 * STA/TID and check if this STA/TID is on aggregation */
Harvey Harrison87228f52008-06-11 14:21:59 -07002401 if (!ieee80211_is_data_qos(hdr->frame_control))
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002402 goto end_reorder;
2403
Harvey Harrison238f74a2008-07-02 11:05:34 -07002404 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002405
Ron Rindjunskycee24a32008-03-26 20:36:03 +02002406 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002407 goto end_reorder;
2408
Ron Rindjunskycee24a32008-03-26 20:36:03 +02002409 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2410
Emmanuel Grumbach2560b6e2008-07-10 00:47:19 +03002411 /* qos null data frames are excluded */
2412 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002413 goto end_reorder;
2414
2415 /* new un-ordered ampdu frame - process it */
2416
2417 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01002418 if (tid_agg_rx->timeout)
2419 mod_timer(&tid_agg_rx->session_timer,
2420 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002421
2422 /* if this mpdu is fragmented - terminate rx aggregation session */
2423 sc = le16_to_cpu(hdr->seq_ctrl);
2424 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Berg17741cd2008-09-11 00:02:02 +02002425 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002426 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2427 ret = 1;
2428 goto end_reorder;
2429 }
2430
2431 /* according to mpdu sequence number deal with reordering buffer */
2432 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
Johannes Bergf1d58c22009-06-17 13:13:00 +02002433 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002434 mpdu_seq_num, 0);
Johannes Bergd0709a62008-02-25 16:27:46 +01002435 end_reorder:
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002436 return ret;
2437}
2438
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002439/*
2440 * This is the receive path handler. It is called by a low level driver when an
2441 * 802.11 MPDU is received from the hardware.
2442 */
John W. Linville103bf9f2009-08-20 16:34:15 -04002443void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002444{
2445 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01002446 struct ieee80211_rate *rate = NULL;
2447 struct ieee80211_supported_band *sband;
Johannes Bergf1d58c22009-06-17 13:13:00 +02002448 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg8318d782008-01-24 19:38:38 +01002449
2450 if (status->band < 0 ||
Adrian Bunk13d8fd22008-04-23 12:51:28 +03002451 status->band >= IEEE80211_NUM_BANDS) {
Johannes Berg8318d782008-01-24 19:38:38 +01002452 WARN_ON(1);
2453 return;
2454 }
2455
2456 sband = local->hw.wiphy->bands[status->band];
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002457 if (!sband) {
Johannes Berg8318d782008-01-24 19:38:38 +01002458 WARN_ON(1);
2459 return;
2460 }
2461
Johannes Berg89c3a8a2009-07-28 18:10:17 +02002462 /*
2463 * If we're suspending, it is possible although not too likely
2464 * that we'd be receiving frames after having already partially
2465 * quiesced the stack. We can't process such frames then since
2466 * that might, for example, cause stations to be added or other
2467 * driver callbacks be invoked.
2468 */
2469 if (unlikely(local->quiescing || local->suspended)) {
2470 kfree_skb(skb);
2471 return;
2472 }
2473
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002474 if (status->flag & RX_FLAG_HT) {
2475 /* rate_idx is MCS index */
2476 if (WARN_ON(status->rate_idx < 0 ||
2477 status->rate_idx >= 76))
2478 return;
2479 /* HT rates are not in the table - use the highest legacy rate
2480 * for now since other parts of mac80211 may not yet be fully
2481 * MCS aware. */
2482 rate = &sband->bitrates[sband->n_bitrates - 1];
2483 } else {
2484 if (WARN_ON(status->rate_idx < 0 ||
2485 status->rate_idx >= sband->n_bitrates))
2486 return;
2487 rate = &sband->bitrates[status->rate_idx];
2488 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002489
2490 /*
2491 * key references and virtual interfaces are protected using RCU
2492 * and this requires that we are in a read-side RCU section during
2493 * receive processing
2494 */
2495 rcu_read_lock();
2496
2497 /*
2498 * Frames with failed FCS/PLCP checksum are not returned,
2499 * all other frames are returned without radiotap header
2500 * if it was previously present.
2501 * Also, frames with less than 16 bytes are dropped.
2502 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002503 skb = ieee80211_rx_monitor(local, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002504 if (!skb) {
2505 rcu_read_unlock();
2506 return;
2507 }
2508
Jouni Malinenaec67952009-05-05 20:35:15 +03002509 /*
2510 * In theory, the block ack reordering should happen after duplicate
2511 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2512 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2513 * happen as a new RX handler between ieee80211_rx_h_check and
2514 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2515 * the time being, the call can be here since RX reorder buf processing
2516 * will implicitly skip duplicates. We could, in theory at least,
2517 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2518 * frames from other than operational channel), but that should not
2519 * happen in normal networks.
2520 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002521 if (!ieee80211_rx_reorder_ampdu(local, skb))
2522 __ieee80211_rx_handle_packet(hw, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002523
2524 rcu_read_unlock();
2525}
John W. Linville103bf9f2009-08-20 16:34:15 -04002526EXPORT_SYMBOL(ieee80211_rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02002527
2528/* This is a version of the rx handler that can be called from hard irq
2529 * context. Post the skb on the queue and schedule the tasklet */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002530void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02002531{
2532 struct ieee80211_local *local = hw_to_local(hw);
2533
2534 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2535
Johannes Berg571ecf62007-07-27 15:43:22 +02002536 skb->pkt_type = IEEE80211_RX_MSG;
2537 skb_queue_tail(&local->skb_queue, skb);
2538 tasklet_schedule(&local->tasklet);
2539}
2540EXPORT_SYMBOL(ieee80211_rx_irqsafe);