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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
Johannes Bergc2b13452008-09-11 00:01:55 +0200421 if (unlikely(local->hw_scanning))
Johannes Bergf1d58c22009-06-17 13:13:00 +0200422 return ieee80211_scan_rx(rx->sdata, skb);
Zhu Yiece8edd2007-11-22 10:53:21 +0800423
Johannes Bergc2b13452008-09-11 00:01:55 +0200424 if (unlikely(local->sw_scanning)) {
Zhu Yiece8edd2007-11-22 10:53:21 +0800425 /* drop all the other packets during a software scan anyway */
Johannes Bergf1d58c22009-06-17 13:13:00 +0200426 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
Zhu Yiece8edd2007-11-22 10:53:21 +0800427 dev_kfree_skb(skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100428 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200429 }
430
Johannes Berg5cf121c2008-02-25 16:27:43 +0100431 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200432 /* scanning finished during invoking of handlers */
433 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100434 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200435 }
436
Johannes Berg9ae54c82008-01-31 19:48:20 +0100437 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200438}
439
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200440
441static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
442{
443 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
444
445 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
446 return 0;
447
448 return ieee80211_is_robust_mgmt_frame(hdr);
449}
450
451
452static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
453{
454 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
455
456 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
457 return 0;
458
459 return ieee80211_is_robust_mgmt_frame(hdr);
460}
461
462
463/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
464static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
465{
466 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
467 struct ieee80211_mmie *mmie;
468
469 if (skb->len < 24 + sizeof(*mmie) ||
470 !is_multicast_ether_addr(hdr->da))
471 return -1;
472
473 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
474 return -1; /* not a robust management frame */
475
476 mmie = (struct ieee80211_mmie *)
477 (skb->data + skb->len - sizeof(*mmie));
478 if (mmie->element_id != WLAN_EID_MMIE ||
479 mmie->length != sizeof(*mmie) - 2)
480 return -1;
481
482 return le16_to_cpu(mmie->key_id);
483}
484
485
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100486static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100487ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100488{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700489 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
490 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100491
Harvey Harrisona7767f92008-07-02 16:30:51 -0700492 if (ieee80211_is_data(hdr->frame_control)) {
493 if (!ieee80211_has_a4(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100494 return RX_DROP_MONITOR;
495 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
496 return RX_DROP_MONITOR;
497 }
498
499 /* If there is not an established peer link and this is not a peer link
500 * establisment frame, beacon or probe, drop the frame.
501 */
502
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800503 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100504 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100505
Harvey Harrisona7767f92008-07-02 16:30:51 -0700506 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100507 return RX_DROP_MONITOR;
508
Harvey Harrisona7767f92008-07-02 16:30:51 -0700509 if (ieee80211_is_action(hdr->frame_control)) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100510 mgmt = (struct ieee80211_mgmt *)hdr;
511 if (mgmt->u.action.category != PLINK_CATEGORY)
512 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100513 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100514 }
515
Harvey Harrisona7767f92008-07-02 16:30:51 -0700516 if (ieee80211_is_probe_req(hdr->frame_control) ||
517 ieee80211_is_probe_resp(hdr->frame_control) ||
518 ieee80211_is_beacon(hdr->frame_control))
519 return RX_CONTINUE;
520
521 return RX_DROP_MONITOR;
522
523 }
524
525#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
526
527 if (ieee80211_is_data(hdr->frame_control) &&
528 is_multicast_ether_addr(hdr->addr1) &&
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200529 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100530 return RX_DROP_MONITOR;
Johannes Berg902acc72008-02-23 15:17:19 +0100531#undef msh_h_get
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100532
Johannes Berg902acc72008-02-23 15:17:19 +0100533 return RX_CONTINUE;
534}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100535
536
Johannes Berg49461622008-06-30 15:10:45 +0200537static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100538ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200539{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700540 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +0200541
542 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
543 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700544 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100545 rx->sta->last_seq_ctrl[rx->queue] ==
Johannes Berg571ecf62007-07-27 15:43:22 +0200546 hdr->seq_ctrl)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +0100547 if (rx->flags & IEEE80211_RX_RA_MATCH) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200548 rx->local->dot11FrameDuplicateCount++;
549 rx->sta->num_duplicates++;
550 }
Johannes Berge4c26ad2008-01-31 19:48:21 +0100551 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200552 } else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100553 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +0200554 }
555
Johannes Berg571ecf62007-07-27 15:43:22 +0200556 if (unlikely(rx->skb->len < 16)) {
557 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100558 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200559 }
560
Johannes Berg571ecf62007-07-27 15:43:22 +0200561 /* Drop disallowed frame classes based on STA auth/assoc state;
562 * IEEE 802.11, Chap 5.5.
563 *
Johannes Bergccd7b362008-09-11 00:01:56 +0200564 * mac80211 filters only based on association state, i.e. it drops
565 * Class 3 frames from not associated stations. hostapd sends
Johannes Berg571ecf62007-07-27 15:43:22 +0200566 * deauth/disassoc frames when needed. In addition, hostapd is
567 * responsible for filtering on both auth and assoc states.
568 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100569
Johannes Berg902acc72008-02-23 15:17:19 +0100570 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100571 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100572
Harvey Harrisona7767f92008-07-02 16:30:51 -0700573 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
574 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200575 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Johannes Berg07346f812008-05-03 01:02:02 +0200576 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700577 if ((!ieee80211_has_fromds(hdr->frame_control) &&
578 !ieee80211_has_tods(hdr->frame_control) &&
579 ieee80211_is_data(hdr->frame_control)) ||
580 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200581 /* Drop IBSS frames and frames for other hosts
582 * silently. */
Johannes Berge4c26ad2008-01-31 19:48:21 +0100583 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200584 }
585
Johannes Berge4c26ad2008-01-31 19:48:21 +0100586 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200587 }
588
Johannes Berg9ae54c82008-01-31 19:48:20 +0100589 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +0200590}
591
592
Johannes Berg49461622008-06-30 15:10:45 +0200593static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100594ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
Johannes Berg570bd532007-07-27 15:43:22 +0200595{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg3017b802007-08-28 17:01:53 -0400597 int keyidx;
598 int hdrlen;
Johannes Berge4c26ad2008-01-31 19:48:21 +0100599 ieee80211_rx_result result = RX_DROP_UNUSABLE;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400600 struct ieee80211_key *stakey = NULL;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200601 int mmie_keyidx = -1;
Johannes Berg570bd532007-07-27 15:43:22 +0200602
Johannes Berg3017b802007-08-28 17:01:53 -0400603 /*
604 * Key selection 101
605 *
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200606 * There are four types of keys:
Johannes Berg3017b802007-08-28 17:01:53 -0400607 * - GTK (group keys)
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200608 * - IGTK (group keys for management frames)
Johannes Berg3017b802007-08-28 17:01:53 -0400609 * - PTK (pairwise keys)
610 * - STK (station-to-station pairwise keys)
611 *
612 * When selecting a key, we have to distinguish between multicast
613 * (including broadcast) and unicast frames, the latter can only
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200614 * use PTKs and STKs while the former always use GTKs and IGTKs.
615 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
616 * unicast frames can also use key indices like GTKs. Hence, if we
617 * don't have a PTK/STK we check the key index for a WEP key.
Johannes Berg3017b802007-08-28 17:01:53 -0400618 *
Johannes Berg8dc06a12007-08-28 17:01:55 -0400619 * Note that in a regular BSS, multicast frames are sent by the
620 * AP only, associated stations unicast the frame to the AP first
621 * which then multicasts it on their behalf.
622 *
Johannes Berg3017b802007-08-28 17:01:53 -0400623 * There is also a slight problem in IBSS mode: GTKs are negotiated
624 * with each station, that is something we don't currently handle.
Johannes Berg8dc06a12007-08-28 17:01:55 -0400625 * The spec seems to expect that one negotiates the same key with
626 * every station but there's no such requirement; VLANs could be
627 * possible.
Johannes Berg3017b802007-08-28 17:01:53 -0400628 */
Johannes Berg571ecf62007-07-27 15:43:22 +0200629
Johannes Berg3017b802007-08-28 17:01:53 -0400630 /*
Johannes Berg1990af82007-09-26 17:53:15 +0200631 * No point in finding a key and decrypting if the frame is neither
Johannes Berg3017b802007-08-28 17:01:53 -0400632 * addressed to us nor a multicast frame.
633 */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100634 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100635 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -0400636
Johannes Bergd4e46a32007-09-14 11:10:24 -0400637 if (rx->sta)
638 stakey = rcu_dereference(rx->sta->key);
639
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300640 if (!ieee80211_has_protected(hdr->frame_control))
641 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
642
Johannes Bergd4e46a32007-09-14 11:10:24 -0400643 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
644 rx->key = stakey;
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300645 /* Skip decryption if the frame is not protected. */
646 if (!ieee80211_has_protected(hdr->frame_control))
647 return RX_CONTINUE;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200648 } else if (mmie_keyidx >= 0) {
649 /* Broadcast/multicast robust management frame / BIP */
650 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
651 (rx->status->flag & RX_FLAG_IV_STRIPPED))
652 return RX_CONTINUE;
653
654 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
655 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
656 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
657 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300658 } else if (!ieee80211_has_protected(hdr->frame_control)) {
659 /*
660 * The frame was not protected, so skip decryption. However, we
661 * need to set rx->key if there is a key that could have been
662 * used so that the frame may be dropped if encryption would
663 * have been expected.
664 */
665 struct ieee80211_key *key = NULL;
666 if (ieee80211_is_mgmt(hdr->frame_control) &&
667 is_multicast_ether_addr(hdr->addr1) &&
668 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
669 rx->key = key;
670 else if ((key = rcu_dereference(rx->sdata->default_key)))
671 rx->key = key;
672 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200673 } else {
Johannes Berg3017b802007-08-28 17:01:53 -0400674 /*
675 * The device doesn't give us the IV so we won't be
676 * able to look up the key. That's ok though, we
677 * don't need to decrypt the frame, we just won't
678 * be able to keep statistics accurate.
679 * Except for key threshold notifications, should
680 * we somehow allow the driver to tell us which key
681 * the hardware used if this flag is set?
682 */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100683 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
684 (rx->status->flag & RX_FLAG_IV_STRIPPED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100685 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200686
Harvey Harrisona7767f92008-07-02 16:30:51 -0700687 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +0200688
Johannes Berg3017b802007-08-28 17:01:53 -0400689 if (rx->skb->len < 8 + hdrlen)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100690 return RX_DROP_UNUSABLE; /* TODO: count this? */
Johannes Berg571ecf62007-07-27 15:43:22 +0200691
Johannes Berg3017b802007-08-28 17:01:53 -0400692 /*
693 * no need to call ieee80211_wep_get_keyidx,
694 * it verifies a bunch of things we've done already
695 */
696 keyidx = rx->skb->data[hdrlen + 3] >> 6;
697
Johannes Bergd4e46a32007-09-14 11:10:24 -0400698 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
Johannes Berg3017b802007-08-28 17:01:53 -0400699
700 /*
701 * RSNA-protected unicast frames should always be sent with
702 * pairwise or station-to-station keys, but for WEP we allow
703 * using a key index as well.
704 */
Johannes Berg8f20fc22007-08-28 17:01:54 -0400705 if (rx->key && rx->key->conf.alg != ALG_WEP &&
Johannes Berg3017b802007-08-28 17:01:53 -0400706 !is_multicast_ether_addr(hdr->addr1))
707 rx->key = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +0200708 }
709
Johannes Berg3017b802007-08-28 17:01:53 -0400710 if (rx->key) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200711 rx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -0400712 /* TODO: add threshold stuff again */
Johannes Berg1990af82007-09-26 17:53:15 +0200713 } else {
Johannes Berge4c26ad2008-01-31 19:48:21 +0100714 return RX_DROP_MONITOR;
Johannes Berg70f08762007-09-26 17:53:14 +0200715 }
716
Johannes Berg1990af82007-09-26 17:53:15 +0200717 /* Check for weak IVs if possible */
718 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
Harvey Harrisona7767f92008-07-02 16:30:51 -0700719 ieee80211_is_data(hdr->frame_control) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100720 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
721 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
Johannes Berg1990af82007-09-26 17:53:15 +0200722 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
723 rx->sta->wep_weak_iv_count++;
724
Johannes Berg70f08762007-09-26 17:53:14 +0200725 switch (rx->key->conf.alg) {
726 case ALG_WEP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200727 result = ieee80211_crypto_wep_decrypt(rx);
728 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200729 case ALG_TKIP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200730 result = ieee80211_crypto_tkip_decrypt(rx);
731 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200732 case ALG_CCMP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200733 result = ieee80211_crypto_ccmp_decrypt(rx);
734 break;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200735 case ALG_AES_CMAC:
736 result = ieee80211_crypto_aes_cmac_decrypt(rx);
737 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200738 }
739
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200740 /* either the frame has been decrypted or will be dropped */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100741 rx->status->flag |= RX_FLAG_DECRYPTED;
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200742
743 return result;
Johannes Berg70f08762007-09-26 17:53:14 +0200744}
745
Kalle Valo572e0012009-02-10 17:09:31 +0200746static ieee80211_rx_result debug_noinline
747ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
748{
749 struct ieee80211_local *local;
750 struct ieee80211_hdr *hdr;
751 struct sk_buff *skb;
752
753 local = rx->local;
754 skb = rx->skb;
755 hdr = (struct ieee80211_hdr *) skb->data;
756
757 if (!local->pspolling)
758 return RX_CONTINUE;
759
760 if (!ieee80211_has_fromds(hdr->frame_control))
761 /* this is not from AP */
762 return RX_CONTINUE;
763
764 if (!ieee80211_is_data(hdr->frame_control))
765 return RX_CONTINUE;
766
767 if (!ieee80211_has_moredata(hdr->frame_control)) {
768 /* AP has no more frames buffered for us */
769 local->pspolling = false;
770 return RX_CONTINUE;
771 }
772
773 /* more data bit is set, let's request a new frame from the AP */
774 ieee80211_send_pspoll(local, rx->sdata);
775
776 return RX_CONTINUE;
777}
778
Johannes Berg133b8222008-09-16 14:18:59 +0200779static void ap_sta_ps_start(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +0200780{
Johannes Berg133b8222008-09-16 14:18:59 +0200781 struct ieee80211_sub_if_data *sdata = sta->sdata;
Christian Lamparter4571d3b2008-11-30 00:48:41 +0100782 struct ieee80211_local *local = sdata->local;
Joe Perches0795af52007-10-03 17:59:30 -0700783
Johannes Berg3e122be2008-07-09 14:40:34 +0200784 atomic_inc(&sdata->bss->num_sta_ps);
Johannes Berg07346f812008-05-03 01:02:02 +0200785 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
Johannes Berg24487982009-04-23 18:52:52 +0200786 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta);
Johannes Berg571ecf62007-07-27 15:43:22 +0200787#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700788 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
789 sdata->dev->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200790#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
791}
792
Johannes Berg133b8222008-09-16 14:18:59 +0200793static int ap_sta_ps_end(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +0200794{
Johannes Berg133b8222008-09-16 14:18:59 +0200795 struct ieee80211_sub_if_data *sdata = sta->sdata;
796 struct ieee80211_local *local = sdata->local;
Johannes Berg8f77f382009-06-07 21:58:37 +0200797 int sent, buffered;
Johannes Berg571ecf62007-07-27 15:43:22 +0200798
Johannes Berg3e122be2008-07-09 14:40:34 +0200799 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg004c8722008-02-20 11:21:35 +0100800
Johannes Berg07346f812008-05-03 01:02:02 +0200801 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
Johannes Berg24487982009-04-23 18:52:52 +0200802 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta);
Johannes Berg004c8722008-02-20 11:21:35 +0100803
804 if (!skb_queue_empty(&sta->ps_tx_buf))
805 sta_info_clear_tim_bit(sta);
806
Johannes Berg571ecf62007-07-27 15:43:22 +0200807#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700808 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
809 sdata->dev->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200810#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg004c8722008-02-20 11:21:35 +0100811
Johannes Berg571ecf62007-07-27 15:43:22 +0200812 /* Send all buffered frames to the station */
Johannes Berg8f77f382009-06-07 21:58:37 +0200813 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
814 buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf);
815 sent += buffered;
816 local->total_ps_buffered -= buffered;
817
Johannes Berg571ecf62007-07-27 15:43:22 +0200818#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg8f77f382009-06-07 21:58:37 +0200819 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
820 "since STA not sleeping anymore\n", sdata->dev->name,
821 sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
Johannes Berg571ecf62007-07-27 15:43:22 +0200822#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg571ecf62007-07-27 15:43:22 +0200823
824 return sent;
825}
826
Johannes Berg49461622008-06-30 15:10:45 +0200827static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100828ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200829{
830 struct sta_info *sta = rx->sta;
Harvey Harrisona7767f92008-07-02 16:30:51 -0700831 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +0200832
833 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +0100834 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200835
Johannes Bergb291ba12009-07-10 15:29:03 +0200836 /*
837 * Update last_rx only for IBSS packets which are for the current
838 * BSSID to avoid keeping the current IBSS network alive in cases
839 * where other STAs start using different BSSID.
840 */
Johannes Berg05c914f2008-09-11 00:01:58 +0200841 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +0200842 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +0200843 NL80211_IFTYPE_ADHOC);
Johannes Berg46900292009-02-15 12:44:28 +0100844 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
Johannes Berg571ecf62007-07-27 15:43:22 +0200845 sta->last_rx = jiffies;
Johannes Bergb291ba12009-07-10 15:29:03 +0200846 } else if (!is_multicast_ether_addr(hdr->addr1)) {
847 /*
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100848 * Mesh beacons will update last_rx when if they are found to
849 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +0200850 */
Johannes Bergb291ba12009-07-10 15:29:03 +0200851 sta->last_rx = jiffies;
Johannes Berg571ecf62007-07-27 15:43:22 +0200852 }
853
Johannes Berg5cf121c2008-02-25 16:27:43 +0100854 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100855 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200856
Kalle Valo3cf335d2009-03-22 21:57:06 +0200857 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
858 ieee80211_sta_rx_notify(rx->sdata, hdr);
859
Johannes Berg571ecf62007-07-27 15:43:22 +0200860 sta->rx_fragments++;
861 sta->rx_bytes += rx->skb->len;
Johannes Berg5cf121c2008-02-25 16:27:43 +0100862 sta->last_signal = rx->status->signal;
Bruno Randolf566bfe52008-05-08 19:15:40 +0200863 sta->last_qual = rx->status->qual;
Johannes Berg5cf121c2008-02-25 16:27:43 +0100864 sta->last_noise = rx->status->noise;
Johannes Berg571ecf62007-07-27 15:43:22 +0200865
Johannes Berg72eaa432008-11-26 15:02:58 +0100866 /*
867 * Change STA power saving mode only at the end of a frame
868 * exchange sequence.
869 */
Johannes Berg3e122be2008-07-09 14:40:34 +0200870 if (!ieee80211_has_morefrags(hdr->frame_control) &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200871 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
872 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
Johannes Berg72eaa432008-11-26 15:02:58 +0100873 if (test_sta_flags(sta, WLAN_STA_PS)) {
874 /*
875 * Ignore doze->wake transitions that are
876 * indicated by non-data frames, the standard
877 * is unclear here, but for example going to
878 * PS mode and then scanning would cause a
879 * doze->wake transition for the probe request,
880 * and that is clearly undesirable.
881 */
882 if (ieee80211_is_data(hdr->frame_control) &&
883 !ieee80211_has_pm(hdr->frame_control))
884 rx->sent_ps_buffered += ap_sta_ps_end(sta);
885 } else {
886 if (ieee80211_has_pm(hdr->frame_control))
887 ap_sta_ps_start(sta);
888 }
Johannes Berg571ecf62007-07-27 15:43:22 +0200889 }
890
891 /* Drop data::nullfunc frames silently, since they are used only to
892 * control station power saving mode. */
Harvey Harrisona7767f92008-07-02 16:30:51 -0700893 if (ieee80211_is_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200894 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
895 /* Update counter and free packet here to avoid counting this
896 * as a dropped packed. */
897 sta->rx_packets++;
898 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100899 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200900 }
901
Johannes Berg9ae54c82008-01-31 19:48:20 +0100902 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200903} /* ieee80211_rx_h_sta_process */
904
Johannes Berg571ecf62007-07-27 15:43:22 +0200905static inline struct ieee80211_fragment_entry *
906ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
907 unsigned int frag, unsigned int seq, int rx_queue,
908 struct sk_buff **skb)
909{
910 struct ieee80211_fragment_entry *entry;
911 int idx;
912
913 idx = sdata->fragment_next;
914 entry = &sdata->fragments[sdata->fragment_next++];
915 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
916 sdata->fragment_next = 0;
917
918 if (!skb_queue_empty(&entry->skb_list)) {
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200919#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg571ecf62007-07-27 15:43:22 +0200920 struct ieee80211_hdr *hdr =
921 (struct ieee80211_hdr *) entry->skb_list.next->data;
922 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
923 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
Johannes Berg0c68ae262008-10-27 15:56:10 -0700924 "addr1=%pM addr2=%pM\n",
Johannes Berg571ecf62007-07-27 15:43:22 +0200925 sdata->dev->name, idx,
926 jiffies - entry->first_frag_time, entry->seq,
Johannes Berg0c68ae262008-10-27 15:56:10 -0700927 entry->last_frag, hdr->addr1, hdr->addr2);
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200928#endif
Johannes Berg571ecf62007-07-27 15:43:22 +0200929 __skb_queue_purge(&entry->skb_list);
930 }
931
932 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
933 *skb = NULL;
934 entry->first_frag_time = jiffies;
935 entry->seq = seq;
936 entry->rx_queue = rx_queue;
937 entry->last_frag = frag;
938 entry->ccmp = 0;
939 entry->extra_len = 0;
940
941 return entry;
942}
943
944static inline struct ieee80211_fragment_entry *
945ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700946 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +0200947 int rx_queue, struct ieee80211_hdr *hdr)
948{
949 struct ieee80211_fragment_entry *entry;
950 int i, idx;
951
952 idx = sdata->fragment_next;
953 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
954 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +0200955
956 idx--;
957 if (idx < 0)
958 idx = IEEE80211_FRAGMENT_MAX - 1;
959
960 entry = &sdata->fragments[idx];
961 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
962 entry->rx_queue != rx_queue ||
963 entry->last_frag + 1 != frag)
964 continue;
965
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700966 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +0200967
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700968 /*
969 * Check ftype and addresses are equal, else check next fragment
970 */
971 if (((hdr->frame_control ^ f_hdr->frame_control) &
972 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Johannes Berg571ecf62007-07-27 15:43:22 +0200973 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
974 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
975 continue;
976
S.Çağlar Onurab466232008-02-14 17:36:47 +0200977 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200978 __skb_queue_purge(&entry->skb_list);
979 continue;
980 }
981 return entry;
982 }
983
984 return NULL;
985}
986
Johannes Berg49461622008-06-30 15:10:45 +0200987static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100988ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200989{
990 struct ieee80211_hdr *hdr;
991 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -0700992 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +0200993 unsigned int frag, seq;
994 struct ieee80211_fragment_entry *entry;
995 struct sk_buff *skb;
996
Harvey Harrisonb73d70a2008-07-15 18:44:12 -0700997 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -0700998 fc = hdr->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +0200999 sc = le16_to_cpu(hdr->seq_ctrl);
1000 frag = sc & IEEE80211_SCTL_FRAG;
1001
Harvey Harrison358c8d92008-07-15 18:44:13 -07001002 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001003 (rx->skb)->len < 24 ||
1004 is_multicast_ether_addr(hdr->addr1))) {
1005 /* not fragmented */
1006 goto out;
1007 }
1008 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1009
1010 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1011
1012 if (frag == 0) {
1013 /* This is the first fragment of a new frame. */
1014 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001015 rx->queue, &(rx->skb));
Johannes Berg8f20fc22007-08-28 17:01:54 -04001016 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
Harvey Harrison358c8d92008-07-15 18:44:13 -07001017 ieee80211_has_protected(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001018 /* Store CCMP PN so that we can verify that the next
1019 * fragment has a sequential PN value. */
1020 entry->ccmp = 1;
1021 memcpy(entry->last_pn,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001022 rx->key->u.ccmp.rx_pn[rx->queue],
Johannes Berg571ecf62007-07-27 15:43:22 +02001023 CCMP_PN_LEN);
1024 }
Johannes Berg9ae54c82008-01-31 19:48:20 +01001025 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001026 }
1027
1028 /* This is a fragment for a frame that should already be pending in
1029 * fragment cache. Add this fragment to the end of the pending entry.
1030 */
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001031 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001032 if (!entry) {
1033 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001034 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001035 }
1036
1037 /* Verify that MPDUs within one MSDU have sequential PN values.
1038 * (IEEE 802.11i, 8.3.3.4.5) */
1039 if (entry->ccmp) {
1040 int i;
1041 u8 pn[CCMP_PN_LEN], *rpn;
Johannes Berg8f20fc22007-08-28 17:01:54 -04001042 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001043 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001044 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1045 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1046 pn[i]++;
1047 if (pn[i])
1048 break;
1049 }
Johannes Berg5cf121c2008-02-25 16:27:43 +01001050 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001051 if (memcmp(pn, rpn, CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001052 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001053 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1054 }
1055
Harvey Harrison358c8d92008-07-15 18:44:13 -07001056 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +02001057 __skb_queue_tail(&entry->skb_list, rx->skb);
1058 entry->last_frag = frag;
1059 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001060 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001061 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001062 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001063 }
1064
1065 rx->skb = __skb_dequeue(&entry->skb_list);
1066 if (skb_tailroom(rx->skb) < entry->extra_len) {
1067 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1068 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1069 GFP_ATOMIC))) {
1070 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1071 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001072 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001073 }
1074 }
1075 while ((skb = __skb_dequeue(&entry->skb_list))) {
1076 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1077 dev_kfree_skb(skb);
1078 }
1079
1080 /* Complete frame has been reassembled - process it now */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001081 rx->flags |= IEEE80211_RX_FRAGMENTED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001082
1083 out:
1084 if (rx->sta)
1085 rx->sta->rx_packets++;
1086 if (is_multicast_ether_addr(hdr->addr1))
1087 rx->local->dot11MulticastReceivedFrameCount++;
1088 else
1089 ieee80211_led_rx(rx->local);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001090 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001091}
1092
Johannes Berg49461622008-06-30 15:10:45 +02001093static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001094ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001095{
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +02001096 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
Johannes Berg571ecf62007-07-27 15:43:22 +02001097 struct sk_buff *skb;
1098 int no_pending_pkts;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001099 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02001100
Harvey Harrison358c8d92008-07-15 18:44:13 -07001101 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
Johannes Berg5cf121c2008-02-25 16:27:43 +01001102 !(rx->flags & IEEE80211_RX_RA_MATCH)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001103 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001104
Johannes Berg05c914f2008-09-11 00:01:58 +02001105 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1106 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001107 return RX_DROP_UNUSABLE;
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +02001108
Johannes Berg571ecf62007-07-27 15:43:22 +02001109 skb = skb_dequeue(&rx->sta->tx_filtered);
1110 if (!skb) {
1111 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1112 if (skb)
1113 rx->local->total_ps_buffered--;
1114 }
1115 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1116 skb_queue_empty(&rx->sta->ps_tx_buf);
1117
1118 if (skb) {
1119 struct ieee80211_hdr *hdr =
1120 (struct ieee80211_hdr *) skb->data;
1121
Johannes Berg4a9a66e2008-02-19 11:31:14 +01001122 /*
1123 * Tell TX path to send one frame even though the STA may
1124 * still remain is PS mode after this frame exchange.
1125 */
Johannes Berg07346f812008-05-03 01:02:02 +02001126 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
Johannes Berg571ecf62007-07-27 15:43:22 +02001127
1128#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001129 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1130 rx->sta->sta.addr, rx->sta->sta.aid,
Johannes Berg571ecf62007-07-27 15:43:22 +02001131 skb_queue_len(&rx->sta->ps_tx_buf));
1132#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1133
1134 /* Use MoreData flag to indicate whether there are more
1135 * buffered frames for this STA */
Johannes Berg836341a2008-02-20 02:07:21 +01001136 if (no_pending_pkts)
Johannes Berg571ecf62007-07-27 15:43:22 +02001137 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
Johannes Berg836341a2008-02-20 02:07:21 +01001138 else
Johannes Berg571ecf62007-07-27 15:43:22 +02001139 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1140
1141 dev_queue_xmit(skb);
1142
Johannes Berg004c8722008-02-20 11:21:35 +01001143 if (no_pending_pkts)
1144 sta_info_clear_tim_bit(rx->sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001145#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg5cf121c2008-02-25 16:27:43 +01001146 } else if (!rx->sent_ps_buffered) {
Johannes Berg004c8722008-02-20 11:21:35 +01001147 /*
1148 * FIXME: This can be the result of a race condition between
1149 * us expiring a frame and the station polling for it.
1150 * Should we send it a null-func frame indicating we
1151 * have nothing buffered for it?
1152 */
Johannes Berg0c68ae262008-10-27 15:56:10 -07001153 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001154 "though there are no buffered frames for it\n",
Johannes Berg0c68ae262008-10-27 15:56:10 -07001155 rx->dev->name, rx->sta->sta.addr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001156#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg571ecf62007-07-27 15:43:22 +02001157 }
1158
Johannes Berg9ae54c82008-01-31 19:48:20 +01001159 /* Free PS Poll skb here instead of returning RX_DROP that would
Johannes Berg571ecf62007-07-27 15:43:22 +02001160 * count as an dropped frame. */
1161 dev_kfree_skb(rx->skb);
1162
Johannes Berg9ae54c82008-01-31 19:48:20 +01001163 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001164}
1165
Johannes Berg49461622008-06-30 15:10:45 +02001166static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001167ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +02001168{
Johannes Berg6e0d1142007-07-27 15:43:22 +02001169 u8 *data = rx->skb->data;
Harvey Harrison238f74a2008-07-02 11:05:34 -07001170 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001171
Harvey Harrison238f74a2008-07-02 11:05:34 -07001172 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001173 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001174
1175 /* remove the qos control field, update frame type and meta-data */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001176 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1177 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1178 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001179 /* change frame type to non QOS */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001180 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001181
Johannes Berg9ae54c82008-01-31 19:48:20 +01001182 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001183}
1184
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001185static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001186ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001187{
Johannes Berg07346f812008-05-03 01:02:02 +02001188 if (unlikely(!rx->sta ||
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001189 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001190 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001191
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001192 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001193}
1194
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001195static int
Harvey Harrison358c8d92008-07-15 18:44:13 -07001196ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02001197{
Johannes Berg3017b802007-08-28 17:01:53 -04001198 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001199 * Pass through unencrypted frames if the hardware has
1200 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001201 */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001202 if (rx->status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001203 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001204
1205 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001206 if (unlikely(!ieee80211_has_protected(fc) &&
1207 !ieee80211_is_nullfunc(fc) &&
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001208 ieee80211_is_data(fc) &&
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +02001209 (rx->key || rx->sdata->drop_unencrypted)))
1210 return -EACCES;
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001211 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1212 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1213 rx->key))
1214 return -EACCES;
1215 /* BIP does not use Protected field, so need to check MMIE */
1216 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb)
1217 && ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1218 rx->key))
1219 return -EACCES;
1220 /*
1221 * When using MFP, Action frames are not allowed prior to
1222 * having configured keys.
1223 */
1224 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1225 ieee80211_is_robust_mgmt_frame(
1226 (struct ieee80211_hdr *) rx->skb->data)))
1227 return -EACCES;
1228 }
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001229
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001230 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001231}
1232
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001233static int
Zhu Yie31a16d2009-05-21 21:47:03 +08001234__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001235{
1236 struct net_device *dev = rx->dev;
Johannes Berg571ecf62007-07-27 15:43:22 +02001237 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1238
Zhu Yie31a16d2009-05-21 21:47:03 +08001239 return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001240}
Johannes Berg571ecf62007-07-27 15:43:22 +02001241
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001242/*
1243 * requires that rx->skb is a frame with ethernet header
1244 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001245static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001246{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301247 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001248 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1249 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1250
1251 /*
1252 * Allow EAPOL frames to us/the PAE group address regardless
1253 * of whether the frame was encrypted or not.
1254 */
1255 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1256 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1257 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1258 return true;
1259
1260 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07001261 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001262 return false;
1263
1264 return true;
1265}
1266
1267/*
1268 * requires that rx->skb is a frame with ethernet header
1269 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001270static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01001271ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001272{
1273 struct net_device *dev = rx->dev;
1274 struct ieee80211_local *local = rx->local;
1275 struct sk_buff *skb, *xmit_skb;
1276 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001277 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1278 struct sta_info *dsta;
Johannes Berg571ecf62007-07-27 15:43:22 +02001279
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001280 skb = rx->skb;
1281 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001282
Johannes Berg05c914f2008-09-11 00:01:58 +02001283 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1284 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02001285 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +01001286 (rx->flags & IEEE80211_RX_RA_MATCH)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001287 if (is_multicast_ether_addr(ehdr->h_dest)) {
1288 /*
1289 * send multicast frames both to higher layers in
1290 * local net stack and back to the wireless medium
1291 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001292 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1293 if (!xmit_skb && net_ratelimit())
Johannes Berg571ecf62007-07-27 15:43:22 +02001294 printk(KERN_DEBUG "%s: failed to clone "
1295 "multicast frame\n", dev->name);
1296 } else {
Johannes Berg571ecf62007-07-27 15:43:22 +02001297 dsta = sta_info_get(local, skb->data);
Johannes Bergd0709a62008-02-25 16:27:46 +01001298 if (dsta && dsta->sdata->dev == dev) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001299 /*
1300 * The destination station is associated to
1301 * this AP (in this VLAN), so send the frame
1302 * directly to it and do not pass it to local
1303 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02001304 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001305 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001306 skb = NULL;
1307 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001308 }
1309 }
1310
1311 if (skb) {
Johannes Bergd1c3a372009-01-07 00:26:10 +01001312 int align __maybe_unused;
1313
1314#if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1315 /*
1316 * 'align' will only take the values 0 or 2 here
1317 * since all frames are required to be aligned
1318 * to 2-byte boundaries when being passed to
1319 * mac80211. That also explains the __skb_push()
1320 * below.
1321 */
matthieu castetdacb6f12009-06-04 22:16:18 +02001322 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01001323 if (align) {
1324 if (WARN_ON(skb_headroom(skb) < 3)) {
1325 dev_kfree_skb(skb);
1326 skb = NULL;
1327 } else {
1328 u8 *data = skb->data;
1329 size_t len = skb->len;
1330 u8 *new = __skb_push(skb, align);
1331 memmove(new, data, len);
1332 __skb_trim(skb, len);
1333 }
1334 }
1335#endif
1336
1337 if (skb) {
1338 /* deliver to local stack */
1339 skb->protocol = eth_type_trans(skb, dev);
1340 memset(skb->cb, 0, sizeof(skb->cb));
1341 netif_rx(skb);
1342 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001343 }
1344
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001345 if (xmit_skb) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001346 /* send to wireless media */
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09001347 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001348 skb_reset_network_header(xmit_skb);
1349 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001350 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001351 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001352}
1353
Johannes Berg49461622008-06-30 15:10:45 +02001354static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001355ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001356{
1357 struct net_device *dev = rx->dev;
1358 struct ieee80211_local *local = rx->local;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001359 u16 ethertype;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001360 u8 *payload;
1361 struct sk_buff *skb = rx->skb, *frame = NULL;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001362 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1363 __le16 fc = hdr->frame_control;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001364 const struct ethhdr *eth;
1365 int remaining, err;
1366 u8 dst[ETH_ALEN];
1367 u8 src[ETH_ALEN];
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001368
Harvey Harrison358c8d92008-07-15 18:44:13 -07001369 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001370 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001371
Harvey Harrison358c8d92008-07-15 18:44:13 -07001372 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001373 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001374
Johannes Berg5cf121c2008-02-25 16:27:43 +01001375 if (!(rx->flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001376 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001377
Zhu Yie31a16d2009-05-21 21:47:03 +08001378 err = __ieee80211_data_to_8023(rx);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001379 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001380 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001381
1382 skb->dev = dev;
1383
1384 dev->stats.rx_packets++;
1385 dev->stats.rx_bytes += skb->len;
1386
1387 /* skip the wrapping header */
1388 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1389 if (!eth)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001390 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001391
1392 while (skb != frame) {
1393 u8 padding;
1394 __be16 len = eth->h_proto;
1395 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1396
1397 remaining = skb->len;
1398 memcpy(dst, eth->h_dest, ETH_ALEN);
1399 memcpy(src, eth->h_source, ETH_ALEN);
1400
1401 padding = ((4 - subframe_len) & 0x3);
1402 /* the last MSDU has no padding */
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001403 if (subframe_len > remaining)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001404 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001405
1406 skb_pull(skb, sizeof(struct ethhdr));
1407 /* if last subframe reuse skb */
1408 if (remaining <= subframe_len + padding)
1409 frame = skb;
1410 else {
Johannes Bergd1c3a372009-01-07 00:26:10 +01001411 /*
1412 * Allocate and reserve two bytes more for payload
1413 * alignment since sizeof(struct ethhdr) is 14.
1414 */
1415 frame = dev_alloc_skb(
1416 ALIGN(local->hw.extra_tx_headroom, 4) +
1417 subframe_len + 2);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001418
1419 if (frame == NULL)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001420 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001421
Johannes Bergd1c3a372009-01-07 00:26:10 +01001422 skb_reserve(frame,
1423 ALIGN(local->hw.extra_tx_headroom, 4) +
1424 sizeof(struct ethhdr) + 2);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001425 memcpy(skb_put(frame, ntohs(len)), skb->data,
1426 ntohs(len));
1427
1428 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1429 padding);
1430 if (!eth) {
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001431 dev_kfree_skb(frame);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001432 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001433 }
1434 }
1435
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001436 skb_reset_network_header(frame);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001437 frame->dev = dev;
1438 frame->priority = skb->priority;
1439 rx->skb = frame;
1440
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001441 payload = frame->data;
1442 ethertype = (payload[6] << 8) | payload[7];
1443
1444 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001445 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1446 compare_ether_addr(payload,
1447 bridge_tunnel_header) == 0)) {
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001448 /* remove RFC1042 or Bridge-Tunnel
1449 * encapsulation and replace EtherType */
1450 skb_pull(frame, 6);
1451 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1452 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1453 } else {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001454 memcpy(skb_push(frame, sizeof(__be16)),
1455 &len, sizeof(__be16));
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001456 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1457 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1458 }
1459
Harvey Harrison358c8d92008-07-15 18:44:13 -07001460 if (!ieee80211_frame_allowed(rx, fc)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001461 if (skb == frame) /* last frame */
Johannes Berge4c26ad2008-01-31 19:48:21 +01001462 return RX_DROP_UNUSABLE;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001463 dev_kfree_skb(frame);
1464 continue;
1465 }
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001466
1467 ieee80211_deliver_skb(rx);
1468 }
1469
Johannes Berg9ae54c82008-01-31 19:48:20 +01001470 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001471}
1472
Ingo Molnarbf94e172008-10-12 23:51:38 -07001473#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02001474static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001475ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1476{
1477 struct ieee80211_hdr *hdr;
1478 struct ieee80211s_hdr *mesh_hdr;
1479 unsigned int hdrlen;
1480 struct sk_buff *skb = rx->skb, *fwd_skb;
1481
1482 hdr = (struct ieee80211_hdr *) skb->data;
1483 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1484 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1485
1486 if (!ieee80211_is_data(hdr->frame_control))
1487 return RX_CONTINUE;
1488
1489 if (!mesh_hdr->ttl)
1490 /* illegal frame */
1491 return RX_DROP_MONITOR;
1492
YanBo79617de2008-09-22 13:30:32 +08001493 if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){
1494 struct ieee80211_sub_if_data *sdata;
1495 struct mesh_path *mppath;
1496
1497 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1498 rcu_read_lock();
1499 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1500 if (!mppath) {
1501 mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1502 } else {
1503 spin_lock_bh(&mppath->state_lock);
1504 mppath->exp_time = jiffies;
1505 if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1506 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1507 spin_unlock_bh(&mppath->state_lock);
1508 }
1509 rcu_read_unlock();
1510 }
1511
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001512 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1513 return RX_CONTINUE;
1514
1515 mesh_hdr->ttl--;
1516
1517 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1518 if (!mesh_hdr->ttl)
Johannes Berg472dbc42008-09-11 00:01:49 +02001519 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001520 dropped_frames_ttl);
1521 else {
1522 struct ieee80211_hdr *fwd_hdr;
1523 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1524
1525 if (!fwd_skb && net_ratelimit())
1526 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1527 rx->dev->name);
1528
1529 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1530 /*
1531 * Save TA to addr1 to send TA a path error if a
1532 * suitable next hop is not found
1533 */
1534 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1535 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1536 fwd_skb->dev = rx->local->mdev;
1537 fwd_skb->iif = rx->dev->ifindex;
1538 dev_queue_xmit(fwd_skb);
1539 }
1540 }
1541
1542 if (is_multicast_ether_addr(hdr->addr3) ||
1543 rx->dev->flags & IFF_PROMISC)
1544 return RX_CONTINUE;
1545 else
1546 return RX_DROP_MONITOR;
1547}
Ingo Molnarbf94e172008-10-12 23:51:38 -07001548#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001549
1550static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001551ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001552{
1553 struct net_device *dev = rx->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001554 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1555 __le16 fc = hdr->frame_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001556 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001557
Harvey Harrison358c8d92008-07-15 18:44:13 -07001558 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001559 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001560
Harvey Harrison358c8d92008-07-15 18:44:13 -07001561 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001562 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001563
Zhu Yie31a16d2009-05-21 21:47:03 +08001564 err = __ieee80211_data_to_8023(rx);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001565 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001566 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001567
Harvey Harrison358c8d92008-07-15 18:44:13 -07001568 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001569 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001570
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001571 rx->skb->dev = dev;
1572
1573 dev->stats.rx_packets++;
1574 dev->stats.rx_bytes += rx->skb->len;
1575
1576 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02001577
Johannes Berg9ae54c82008-01-31 19:48:20 +01001578 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001579}
1580
Johannes Berg49461622008-06-30 15:10:45 +02001581static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001582ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
Ron Rindjunsky71364712007-12-25 17:00:36 +02001583{
1584 struct ieee80211_local *local = rx->local;
1585 struct ieee80211_hw *hw = &local->hw;
1586 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07001587 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001588 struct tid_ampdu_rx *tid_agg_rx;
1589 u16 start_seq_num;
1590 u16 tid;
1591
Harvey Harrisona7767f92008-07-02 16:30:51 -07001592 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001593 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001594
Harvey Harrisona7767f92008-07-02 16:30:51 -07001595 if (ieee80211_is_back_req(bar->frame_control)) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001596 if (!rx->sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001597 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001598 tid = le16_to_cpu(bar->control) >> 12;
Ron Rindjunskycee24a32008-03-26 20:36:03 +02001599 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1600 != HT_AGG_STATE_OPERATIONAL)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001601 return RX_CONTINUE;
Ron Rindjunskycee24a32008-03-26 20:36:03 +02001602 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
Ron Rindjunsky71364712007-12-25 17:00:36 +02001603
1604 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1605
1606 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01001607 if (tid_agg_rx->timeout)
1608 mod_timer(&tid_agg_rx->session_timer,
1609 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02001610
1611 /* manage reordering buffer according to requested */
1612 /* sequence number */
1613 rcu_read_lock();
Johannes Bergf1d58c22009-06-17 13:13:00 +02001614 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
Ron Rindjunsky71364712007-12-25 17:00:36 +02001615 start_seq_num, 1);
1616 rcu_read_unlock();
Johannes Berge4c26ad2008-01-31 19:48:21 +01001617 return RX_DROP_UNUSABLE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001618 }
1619
Johannes Berg9ae54c82008-01-31 19:48:20 +01001620 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001621}
1622
Jouni Malinenf4f727a2009-01-10 11:46:53 +02001623static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1624 struct ieee80211_mgmt *mgmt,
1625 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02001626{
1627 struct ieee80211_local *local = sdata->local;
1628 struct sk_buff *skb;
1629 struct ieee80211_mgmt *resp;
1630
1631 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1632 /* Not to own unicast address */
1633 return;
1634 }
1635
Johannes Berg46900292009-02-15 12:44:28 +01001636 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1637 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
Johannes Berg77fdaa12009-07-07 03:45:17 +02001638 /* Not from the current AP or not associated yet. */
Jouni Malinenfea14732009-01-08 13:32:06 +02001639 return;
1640 }
1641
1642 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1643 /* Too short SA Query request frame */
1644 return;
1645 }
1646
1647 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1648 if (skb == NULL)
1649 return;
1650
1651 skb_reserve(skb, local->hw.extra_tx_headroom);
1652 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1653 memset(resp, 0, 24);
1654 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1655 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01001656 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02001657 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1658 IEEE80211_STYPE_ACTION);
1659 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1660 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1661 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1662 memcpy(resp->u.action.u.sa_query.trans_id,
1663 mgmt->u.action.u.sa_query.trans_id,
1664 WLAN_SA_QUERY_TR_ID_LEN);
1665
1666 ieee80211_tx_skb(sdata, skb, 1);
1667}
1668
Johannes Berg49461622008-06-30 15:10:45 +02001669static ieee80211_rx_result debug_noinline
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001670ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1671{
1672 struct ieee80211_local *local = rx->local;
1673 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1674 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1675 int len = rx->skb->len;
1676
1677 if (!ieee80211_is_action(mgmt->frame_control))
1678 return RX_CONTINUE;
1679
1680 if (!rx->sta)
1681 return RX_DROP_MONITOR;
1682
1683 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1684 return RX_DROP_MONITOR;
1685
Jouni Malinen97ebe122009-01-08 13:32:08 +02001686 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1687 return RX_DROP_MONITOR;
1688
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001689 /* all categories we currently handle have action_code */
1690 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1691 return RX_DROP_MONITOR;
1692
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001693 switch (mgmt->u.action.category) {
1694 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01001695 /*
1696 * The aggregation code is not prepared to handle
1697 * anything but STA/AP due to the BSSID handling;
1698 * IBSS could work in the code but isn't supported
1699 * by drivers or the standard.
1700 */
1701 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1702 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1703 sdata->vif.type != NL80211_IFTYPE_AP)
1704 return RX_DROP_MONITOR;
1705
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001706 switch (mgmt->u.action.u.addba_req.action_code) {
1707 case WLAN_ACTION_ADDBA_REQ:
1708 if (len < (IEEE80211_MIN_ACTION_SIZE +
1709 sizeof(mgmt->u.action.u.addba_req)))
1710 return RX_DROP_MONITOR;
1711 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1712 break;
1713 case WLAN_ACTION_ADDBA_RESP:
1714 if (len < (IEEE80211_MIN_ACTION_SIZE +
1715 sizeof(mgmt->u.action.u.addba_resp)))
1716 return RX_DROP_MONITOR;
1717 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1718 break;
1719 case WLAN_ACTION_DELBA:
1720 if (len < (IEEE80211_MIN_ACTION_SIZE +
1721 sizeof(mgmt->u.action.u.delba)))
1722 return RX_DROP_MONITOR;
1723 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1724 break;
1725 }
Johannes Berg39192c02008-09-09 14:49:03 +02001726 break;
1727 case WLAN_CATEGORY_SPECTRUM_MGMT:
1728 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1729 return RX_DROP_MONITOR;
Johannes Berg46900292009-02-15 12:44:28 +01001730
1731 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1732 return RX_DROP_MONITOR;
1733
Johannes Berg39192c02008-09-09 14:49:03 +02001734 switch (mgmt->u.action.u.measurement.action_code) {
1735 case WLAN_ACTION_SPCT_MSR_REQ:
1736 if (len < (IEEE80211_MIN_ACTION_SIZE +
1737 sizeof(mgmt->u.action.u.measurement)))
1738 return RX_DROP_MONITOR;
1739 ieee80211_process_measurement_req(sdata, mgmt, len);
1740 break;
Sujithc481ec92009-01-06 09:28:37 +05301741 case WLAN_ACTION_SPCT_CHL_SWITCH:
1742 if (len < (IEEE80211_MIN_ACTION_SIZE +
1743 sizeof(mgmt->u.action.u.chan_switch)))
1744 return RX_DROP_MONITOR;
1745
Johannes Bergcc32abd2009-05-15 11:52:31 +02001746 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1747 return RX_DROP_MONITOR;
1748
Johannes Berg46900292009-02-15 12:44:28 +01001749 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
Sujithc481ec92009-01-06 09:28:37 +05301750 return RX_DROP_MONITOR;
1751
Johannes Berg77fdaa12009-07-07 03:45:17 +02001752 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
Johannes Berg39192c02008-09-09 14:49:03 +02001753 }
1754 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02001755 case WLAN_CATEGORY_SA_QUERY:
1756 if (len < (IEEE80211_MIN_ACTION_SIZE +
1757 sizeof(mgmt->u.action.u.sa_query)))
1758 return RX_DROP_MONITOR;
1759 switch (mgmt->u.action.u.sa_query.action) {
1760 case WLAN_ACTION_SA_QUERY_REQUEST:
1761 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1762 return RX_DROP_MONITOR;
1763 ieee80211_process_sa_query_req(sdata, mgmt, len);
1764 break;
1765 case WLAN_ACTION_SA_QUERY_RESPONSE:
1766 /*
1767 * SA Query response is currently only used in AP mode
1768 * and it is processed in user space.
1769 */
1770 return RX_CONTINUE;
1771 }
1772 break;
Johannes Berg39192c02008-09-09 14:49:03 +02001773 default:
1774 return RX_CONTINUE;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001775 }
1776
Johannes Berg39192c02008-09-09 14:49:03 +02001777 rx->sta->rx_packets++;
1778 dev_kfree_skb(rx->skb);
1779 return RX_QUEUED;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001780}
1781
1782static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001783ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001784{
Johannes Berg759ef3e2008-09-09 14:55:09 +02001785 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
Jouni Malinen97ebe122009-01-08 13:32:08 +02001786 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001787
Johannes Berg5cf121c2008-02-25 16:27:43 +01001788 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001789 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001790
Jouni Malinen97ebe122009-01-08 13:32:08 +02001791 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1792 return RX_DROP_MONITOR;
1793
Johannes Berg472dbc42008-09-11 00:01:49 +02001794 if (ieee80211_vif_is_mesh(&sdata->vif))
Johannes Bergf1d58c22009-06-17 13:13:00 +02001795 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
Johannes Berg472dbc42008-09-11 00:01:49 +02001796
Johannes Berg3832c282009-03-24 08:46:57 +01001797 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
Johannes Bergf1d58c22009-06-17 13:13:00 +02001798 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
Johannes Bergf9d540e2007-09-28 14:02:09 +02001799
Johannes Berg7986cf92009-03-21 17:08:43 +01001800 if (sdata->vif.type == NL80211_IFTYPE_STATION)
Johannes Bergf1d58c22009-06-17 13:13:00 +02001801 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
Johannes Berg46900292009-02-15 12:44:28 +01001802
Johannes Berg7986cf92009-03-21 17:08:43 +01001803 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001804}
1805
Johannes Berg571ecf62007-07-27 15:43:22 +02001806static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1807 struct ieee80211_hdr *hdr,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001808 struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001809{
Harvey Harrisona7767f92008-07-02 16:30:51 -07001810 int keyidx;
1811 unsigned int hdrlen;
Johannes Berg571ecf62007-07-27 15:43:22 +02001812
Harvey Harrisona7767f92008-07-02 16:30:51 -07001813 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +02001814 if (rx->skb->len >= hdrlen + 4)
1815 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1816 else
1817 keyidx = -1;
1818
Johannes Berg8944b792008-01-31 19:48:26 +01001819 if (!rx->sta) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001820 /*
1821 * Some hardware seem to generate incorrect Michael MIC
1822 * reports; ignore them to avoid triggering countermeasures.
1823 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001824 goto ignore;
1825 }
1826
Harvey Harrisona7767f92008-07-02 16:30:51 -07001827 if (!ieee80211_has_protected(hdr->frame_control))
Johannes Berg571ecf62007-07-27 15:43:22 +02001828 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001829
Johannes Berg05c914f2008-09-11 00:01:58 +02001830 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001831 /*
1832 * APs with pairwise keys should never receive Michael MIC
1833 * errors for non-zero keyidx because these are reserved for
1834 * group keys and only the AP is sending real multicast
1835 * frames in the BSS.
1836 */
Johannes Bergeb063c12007-08-28 17:01:53 -04001837 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001838 }
1839
Harvey Harrisona7767f92008-07-02 16:30:51 -07001840 if (!ieee80211_is_data(hdr->frame_control) &&
1841 !ieee80211_is_auth(hdr->frame_control))
Johannes Berg571ecf62007-07-27 15:43:22 +02001842 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001843
Johannes Berge6d6e342009-07-01 21:26:47 +02001844 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
1845 GFP_ATOMIC);
Johannes Berg571ecf62007-07-27 15:43:22 +02001846 ignore:
1847 dev_kfree_skb(rx->skb);
1848 rx->skb = NULL;
1849}
1850
Johannes Berg5cf121c2008-02-25 16:27:43 +01001851/* TODO: use IEEE80211_RX_FRAGMENTED */
1852static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
Michael Wu3d30d942008-01-31 19:48:27 +01001853{
1854 struct ieee80211_sub_if_data *sdata;
1855 struct ieee80211_local *local = rx->local;
1856 struct ieee80211_rtap_hdr {
1857 struct ieee80211_radiotap_header hdr;
1858 u8 flags;
1859 u8 rate;
1860 __le16 chan_freq;
1861 __le16 chan_flags;
1862 } __attribute__ ((packed)) *rthdr;
1863 struct sk_buff *skb = rx->skb, *skb2;
1864 struct net_device *prev_dev = NULL;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001865 struct ieee80211_rx_status *status = rx->status;
Michael Wu3d30d942008-01-31 19:48:27 +01001866
Johannes Berg5cf121c2008-02-25 16:27:43 +01001867 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
Michael Wu3d30d942008-01-31 19:48:27 +01001868 goto out_free_skb;
1869
1870 if (skb_headroom(skb) < sizeof(*rthdr) &&
1871 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1872 goto out_free_skb;
1873
1874 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1875 memset(rthdr, 0, sizeof(*rthdr));
1876 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1877 rthdr->hdr.it_present =
1878 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1879 (1 << IEEE80211_RADIOTAP_RATE) |
1880 (1 << IEEE80211_RADIOTAP_CHANNEL));
1881
Johannes Berg5cf121c2008-02-25 16:27:43 +01001882 rthdr->rate = rx->rate->bitrate / 5;
Michael Wu3d30d942008-01-31 19:48:27 +01001883 rthdr->chan_freq = cpu_to_le16(status->freq);
1884
1885 if (status->band == IEEE80211_BAND_5GHZ)
1886 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1887 IEEE80211_CHAN_5GHZ);
1888 else
1889 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1890 IEEE80211_CHAN_2GHZ);
1891
1892 skb_set_mac_header(skb, 0);
1893 skb->ip_summed = CHECKSUM_UNNECESSARY;
1894 skb->pkt_type = PACKET_OTHERHOST;
1895 skb->protocol = htons(ETH_P_802_2);
1896
1897 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1898 if (!netif_running(sdata->dev))
1899 continue;
1900
Johannes Berg05c914f2008-09-11 00:01:58 +02001901 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Michael Wu3d30d942008-01-31 19:48:27 +01001902 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1903 continue;
1904
1905 if (prev_dev) {
1906 skb2 = skb_clone(skb, GFP_ATOMIC);
1907 if (skb2) {
1908 skb2->dev = prev_dev;
1909 netif_rx(skb2);
1910 }
1911 }
1912
1913 prev_dev = sdata->dev;
1914 sdata->dev->stats.rx_packets++;
1915 sdata->dev->stats.rx_bytes += skb->len;
1916 }
1917
1918 if (prev_dev) {
1919 skb->dev = prev_dev;
1920 netif_rx(skb);
1921 skb = NULL;
1922 } else
1923 goto out_free_skb;
1924
Johannes Berg5cf121c2008-02-25 16:27:43 +01001925 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
Michael Wu3d30d942008-01-31 19:48:27 +01001926 return;
1927
1928 out_free_skb:
1929 dev_kfree_skb(skb);
1930}
1931
Johannes Berg571ecf62007-07-27 15:43:22 +02001932
Johannes Berg8944b792008-01-31 19:48:26 +01001933static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001934 struct ieee80211_rx_data *rx,
Johannes Berg8944b792008-01-31 19:48:26 +01001935 struct sk_buff *skb)
Johannes Berg58905292008-01-31 19:48:25 +01001936{
Johannes Berg58905292008-01-31 19:48:25 +01001937 ieee80211_rx_result res = RX_DROP_MONITOR;
1938
Johannes Berg8944b792008-01-31 19:48:26 +01001939 rx->skb = skb;
1940 rx->sdata = sdata;
1941 rx->dev = sdata->dev;
1942
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001943#define CALL_RXH(rxh) \
1944 do { \
1945 res = rxh(rx); \
1946 if (res != RX_CONTINUE) \
1947 goto rxh_done; \
1948 } while (0);
Johannes Berg58905292008-01-31 19:48:25 +01001949
Johannes Berg49461622008-06-30 15:10:45 +02001950 CALL_RXH(ieee80211_rx_h_passive_scan)
1951 CALL_RXH(ieee80211_rx_h_check)
1952 CALL_RXH(ieee80211_rx_h_decrypt)
Kalle Valo572e0012009-02-10 17:09:31 +02001953 CALL_RXH(ieee80211_rx_h_check_more_data)
Johannes Berg49461622008-06-30 15:10:45 +02001954 CALL_RXH(ieee80211_rx_h_sta_process)
1955 CALL_RXH(ieee80211_rx_h_defragment)
1956 CALL_RXH(ieee80211_rx_h_ps_poll)
1957 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1958 /* must be after MMIC verify so header is counted in MPDU mic */
1959 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1960 CALL_RXH(ieee80211_rx_h_amsdu)
Ingo Molnarbf94e172008-10-12 23:51:38 -07001961#ifdef CONFIG_MAC80211_MESH
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001962 if (ieee80211_vif_is_mesh(&sdata->vif))
1963 CALL_RXH(ieee80211_rx_h_mesh_fwding);
Ingo Molnarbf94e172008-10-12 23:51:38 -07001964#endif
Johannes Berg49461622008-06-30 15:10:45 +02001965 CALL_RXH(ieee80211_rx_h_data)
1966 CALL_RXH(ieee80211_rx_h_ctrl)
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001967 CALL_RXH(ieee80211_rx_h_action)
Johannes Berg49461622008-06-30 15:10:45 +02001968 CALL_RXH(ieee80211_rx_h_mgmt)
Johannes Berg58905292008-01-31 19:48:25 +01001969
Johannes Berg49461622008-06-30 15:10:45 +02001970#undef CALL_RXH
1971
1972 rxh_done:
Johannes Berg58905292008-01-31 19:48:25 +01001973 switch (res) {
Michael Wu3d30d942008-01-31 19:48:27 +01001974 case RX_DROP_MONITOR:
Johannes Berg49461622008-06-30 15:10:45 +02001975 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1976 if (rx->sta)
1977 rx->sta->rx_dropped++;
1978 /* fall through */
1979 case RX_CONTINUE:
Michael Wu3d30d942008-01-31 19:48:27 +01001980 ieee80211_rx_cooked_monitor(rx);
1981 break;
1982 case RX_DROP_UNUSABLE:
Johannes Berg49461622008-06-30 15:10:45 +02001983 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1984 if (rx->sta)
1985 rx->sta->rx_dropped++;
Johannes Berg58905292008-01-31 19:48:25 +01001986 dev_kfree_skb(rx->skb);
1987 break;
Johannes Berg49461622008-06-30 15:10:45 +02001988 case RX_QUEUED:
1989 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1990 break;
Johannes Berg58905292008-01-31 19:48:25 +01001991 }
1992}
1993
Johannes Berg571ecf62007-07-27 15:43:22 +02001994/* main receive path */
1995
Johannes Berg23a24de2007-07-27 15:43:22 +02001996static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg7ab17c42009-02-10 21:25:43 +01001997 struct ieee80211_rx_data *rx,
Johannes Berg23a24de2007-07-27 15:43:22 +02001998 struct ieee80211_hdr *hdr)
1999{
Johannes Berg7ab17c42009-02-10 21:25:43 +01002000 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02002001 int multicast = is_multicast_ether_addr(hdr->addr1);
2002
Johannes Berg51fb61e2007-12-19 01:31:27 +01002003 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02002004 case NL80211_IFTYPE_STATION:
Johannes Berg23a24de2007-07-27 15:43:22 +02002005 if (!bssid)
2006 return 0;
Johannes Berg77fdaa12009-07-07 03:45:17 +02002007 if (!multicast &&
2008 compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002009 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002010 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002011 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002012 }
2013 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002014 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02002015 if (!bssid)
2016 return 0;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002017 if (ieee80211_is_beacon(hdr->frame_control)) {
Bruno Randolf9d9bf772008-02-18 11:21:36 +09002018 return 1;
Vladimir Koutny87291c02008-06-13 16:50:44 +02002019 }
Johannes Berg46900292009-02-15 12:44:28 +01002020 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01002021 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002022 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002023 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002024 } else if (!multicast &&
2025 compare_ether_addr(sdata->dev->dev_addr,
2026 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002027 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002028 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002029 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002030 } else if (!rx->sta) {
2031 int rate_idx;
2032 if (rx->status->flag & RX_FLAG_HT)
2033 rate_idx = 0; /* TODO: HT rates */
2034 else
2035 rate_idx = rx->status->rate_idx;
Rami Rosenab1f5c02008-12-11 14:00:25 +02002036 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002037 BIT(rate_idx));
2038 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002039 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002040 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg6032f932008-02-23 15:17:07 +01002041 if (!multicast &&
2042 compare_ether_addr(sdata->dev->dev_addr,
2043 hdr->addr1) != 0) {
2044 if (!(sdata->dev->flags & IFF_PROMISC))
2045 return 0;
2046
Johannes Berg5cf121c2008-02-25 16:27:43 +01002047 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg6032f932008-02-23 15:17:07 +01002048 }
2049 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002050 case NL80211_IFTYPE_AP_VLAN:
2051 case NL80211_IFTYPE_AP:
Johannes Berg23a24de2007-07-27 15:43:22 +02002052 if (!bssid) {
2053 if (compare_ether_addr(sdata->dev->dev_addr,
2054 hdr->addr1))
2055 return 0;
2056 } else if (!ieee80211_bssid_match(bssid,
2057 sdata->dev->dev_addr)) {
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 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002062 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002063 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07002064 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02002065 return 0;
2066 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2067 return 0;
2068 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002069 case NL80211_IFTYPE_MONITOR:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02002070 /* take everything */
2071 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002072 case NL80211_IFTYPE_UNSPECIFIED:
2073 case __NL80211_IFTYPE_AFTER_LAST:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02002074 /* should never get here */
2075 WARN_ON(1);
2076 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02002077 }
2078
2079 return 1;
2080}
2081
Johannes Berg571ecf62007-07-27 15:43:22 +02002082/*
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002083 * This is the actual Rx frames handler. as it blongs to Rx path it must
2084 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02002085 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002086static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2087 struct sk_buff *skb,
Johannes Berg8318d782008-01-24 19:38:38 +01002088 struct ieee80211_rate *rate)
Johannes Berg571ecf62007-07-27 15:43:22 +02002089{
Johannes Bergf1d58c22009-06-17 13:13:00 +02002090 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002091 struct ieee80211_local *local = hw_to_local(hw);
2092 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002093 struct ieee80211_hdr *hdr;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002094 struct ieee80211_rx_data rx;
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002095 int prepares;
Johannes Berg8e6f0032007-07-27 15:43:22 +02002096 struct ieee80211_sub_if_data *prev = NULL;
2097 struct sk_buff *skb_new;
Johannes Berg571ecf62007-07-27 15:43:22 +02002098
Harvey Harrison358c8d92008-07-15 18:44:13 -07002099 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02002100 memset(&rx, 0, sizeof(rx));
2101 rx.skb = skb;
2102 rx.local = local;
2103
Johannes Berg5cf121c2008-02-25 16:27:43 +01002104 rx.status = status;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002105 rx.rate = rate;
Johannes Berg72abd812007-09-17 01:29:22 -04002106
Harvey Harrison358c8d92008-07-15 18:44:13 -07002107 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
Johannes Berg571ecf62007-07-27 15:43:22 +02002108 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02002109
Johannes Berg8944b792008-01-31 19:48:26 +01002110 rx.sta = sta_info_get(local, hdr->addr2);
2111 if (rx.sta) {
Johannes Bergd0709a62008-02-25 16:27:46 +01002112 rx.sdata = rx.sta->sdata;
2113 rx.dev = rx.sta->sdata->dev;
Johannes Bergb2e77712007-09-26 15:19:39 +02002114 }
Johannes Berg571ecf62007-07-27 15:43:22 +02002115
Johannes Berg571ecf62007-07-27 15:43:22 +02002116 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
Johannes Berg8944b792008-01-31 19:48:26 +01002117 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
Johannes Bergd0709a62008-02-25 16:27:46 +01002118 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002119 }
2120
Johannes Bergc2b13452008-09-11 00:01:55 +02002121 if (unlikely(local->sw_scanning || local->hw_scanning))
Johannes Berg5cf121c2008-02-25 16:27:43 +01002122 rx.flags |= IEEE80211_RX_IN_SCAN;
Johannes Berg571ecf62007-07-27 15:43:22 +02002123
Johannes Berg38f37142008-01-29 17:07:43 +01002124 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01002125 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01002126
Johannes Berg571ecf62007-07-27 15:43:22 +02002127 skb = rx.skb;
2128
Johannes Berg79010422007-09-18 17:29:21 -04002129 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg2a8a9a82007-08-28 17:01:52 -04002130 if (!netif_running(sdata->dev))
2131 continue;
2132
Johannes Berg05c914f2008-09-11 00:01:58 +02002133 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +02002134 continue;
2135
Johannes Berg5cf121c2008-02-25 16:27:43 +01002136 rx.flags |= IEEE80211_RX_RA_MATCH;
Johannes Berg7ab17c42009-02-10 21:25:43 +01002137 prepares = prepare_for_handlers(sdata, &rx, hdr);
Johannes Berg23a24de2007-07-27 15:43:22 +02002138
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002139 if (!prepares)
Johannes Berg23a24de2007-07-27 15:43:22 +02002140 continue;
Johannes Berg8e6f0032007-07-27 15:43:22 +02002141
Johannes Berg340e11f2007-07-27 15:43:22 +02002142 /*
2143 * frame is destined for this interface, but if it's not
2144 * also for the previous one we handle that after the
2145 * loop to avoid copying the SKB once too much
2146 */
2147
2148 if (!prev) {
2149 prev = sdata;
2150 continue;
Johannes Berg8e6f0032007-07-27 15:43:22 +02002151 }
Johannes Berg340e11f2007-07-27 15:43:22 +02002152
2153 /*
2154 * frame was destined for the previous interface
2155 * so invoke RX handlers for it
2156 */
2157
2158 skb_new = skb_copy(skb, GFP_ATOMIC);
2159 if (!skb_new) {
2160 if (net_ratelimit())
2161 printk(KERN_DEBUG "%s: failed to copy "
Pavel Roskina4278e12008-05-12 09:02:24 -04002162 "multicast frame for %s\n",
Johannes Bergdd1cd4c2007-09-18 17:29:20 -04002163 wiphy_name(local->hw.wiphy),
2164 prev->dev->name);
Johannes Berg340e11f2007-07-27 15:43:22 +02002165 continue;
2166 }
Johannes Berg8944b792008-01-31 19:48:26 +01002167 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
Johannes Berg8e6f0032007-07-27 15:43:22 +02002168 prev = sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002169 }
Harvey Harrisona4b7d7b2008-07-15 18:44:14 -07002170 if (prev)
Johannes Berg8944b792008-01-31 19:48:26 +01002171 ieee80211_invoke_rx_handlers(prev, &rx, skb);
Harvey Harrisona4b7d7b2008-07-15 18:44:14 -07002172 else
Johannes Berg8e6f0032007-07-27 15:43:22 +02002173 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002174}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002175
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002176#define SEQ_MODULO 0x1000
2177#define SEQ_MASK 0xfff
2178
2179static inline int seq_less(u16 sq1, u16 sq2)
2180{
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002181 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002182}
2183
2184static inline u16 seq_inc(u16 sq)
2185{
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002186 return (sq + 1) & SEQ_MASK;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002187}
2188
2189static inline u16 seq_sub(u16 sq1, u16 sq2)
2190{
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002191 return (sq1 - sq2) & SEQ_MASK;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002192}
2193
2194
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002195static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
2196 struct tid_ampdu_rx *tid_agg_rx,
2197 int index)
2198{
2199 struct ieee80211_supported_band *sband;
2200 struct ieee80211_rate *rate;
Johannes Bergf1d58c22009-06-17 13:13:00 +02002201 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
2202 struct ieee80211_rx_status *status;
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002203
Johannes Bergf1d58c22009-06-17 13:13:00 +02002204 if (!skb)
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002205 goto no_frame;
2206
Johannes Bergf1d58c22009-06-17 13:13:00 +02002207 status = IEEE80211_SKB_RXCB(skb);
2208
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002209 /* release the reordered frames to stack */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002210 sband = hw->wiphy->bands[status->band];
2211 if (status->flag & RX_FLAG_HT)
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002212 rate = sband->bitrates; /* TODO: HT rates */
2213 else
Johannes Bergf1d58c22009-06-17 13:13:00 +02002214 rate = &sband->bitrates[status->rate_idx];
2215 __ieee80211_rx_handle_packet(hw, skb, rate);
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002216 tid_agg_rx->stored_mpdu_num--;
2217 tid_agg_rx->reorder_buf[index] = NULL;
2218
2219no_frame:
2220 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2221}
2222
2223
Ron Rindjunsky71364712007-12-25 17:00:36 +02002224/*
Jouni Malinen4d050f12009-05-05 20:35:14 +03002225 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2226 * the skb was added to the buffer longer than this time ago, the earlier
2227 * frames that have not yet been received are assumed to be lost and the skb
2228 * can be released for processing. This may also release other skb's from the
2229 * reorder buffer if there are no additional gaps between the frames.
2230 */
2231#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2232
2233/*
Ron Rindjunsky71364712007-12-25 17:00:36 +02002234 * As it function blongs to Rx path it must be called with
2235 * the proper rcu_read_lock protection for its flow.
2236 */
Johannes Bergc6a1fa12008-10-07 12:04:32 +02002237static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2238 struct tid_ampdu_rx *tid_agg_rx,
2239 struct sk_buff *skb,
2240 u16 mpdu_seq_num,
2241 int bar_req)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002242{
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002243 u16 head_seq_num, buf_size;
2244 int index;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002245
2246 buf_size = tid_agg_rx->buf_size;
2247 head_seq_num = tid_agg_rx->head_seq_num;
2248
2249 /* frame with out of date sequence number */
2250 if (seq_less(mpdu_seq_num, head_seq_num)) {
2251 dev_kfree_skb(skb);
2252 return 1;
2253 }
2254
2255 /* if frame sequence number exceeds our buffering window size or
2256 * block Ack Request arrived - release stored frames */
2257 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2258 /* new head to the ordering buffer */
2259 if (bar_req)
2260 head_seq_num = mpdu_seq_num;
2261 else
2262 head_seq_num =
2263 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2264 /* release stored frames up to new head to stack */
2265 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2266 index = seq_sub(tid_agg_rx->head_seq_num,
2267 tid_agg_rx->ssn)
2268 % tid_agg_rx->buf_size;
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002269 ieee80211_release_reorder_frame(hw, tid_agg_rx,
2270 index);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002271 }
2272 if (bar_req)
2273 return 1;
2274 }
2275
2276 /* now the new frame is always in the range of the reordering */
2277 /* buffer window */
2278 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2279 % tid_agg_rx->buf_size;
2280 /* check if we already stored this frame */
2281 if (tid_agg_rx->reorder_buf[index]) {
2282 dev_kfree_skb(skb);
2283 return 1;
2284 }
2285
2286 /* if arrived mpdu is in the right order and nothing else stored */
2287 /* release it immediately */
2288 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2289 tid_agg_rx->stored_mpdu_num == 0) {
2290 tid_agg_rx->head_seq_num =
2291 seq_inc(tid_agg_rx->head_seq_num);
2292 return 0;
2293 }
2294
2295 /* put the frame in the reordering buffer */
2296 tid_agg_rx->reorder_buf[index] = skb;
Jouni Malinen4d050f12009-05-05 20:35:14 +03002297 tid_agg_rx->reorder_time[index] = jiffies;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002298 tid_agg_rx->stored_mpdu_num++;
2299 /* release the buffer until next missing frame */
2300 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2301 % tid_agg_rx->buf_size;
Jouni Malinen4d050f12009-05-05 20:35:14 +03002302 if (!tid_agg_rx->reorder_buf[index] &&
2303 tid_agg_rx->stored_mpdu_num > 1) {
2304 /*
2305 * No buffers ready to be released, but check whether any
2306 * frames in the reorder buffer have timed out.
2307 */
2308 int j;
2309 int skipped = 1;
2310 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
2311 j = (j + 1) % tid_agg_rx->buf_size) {
2312 if (tid_agg_rx->reorder_buf[j] == NULL) {
2313 skipped++;
2314 continue;
2315 }
2316 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
2317 HZ / 10))
2318 break;
2319
2320#ifdef CONFIG_MAC80211_HT_DEBUG
2321 if (net_ratelimit())
2322 printk(KERN_DEBUG "%s: release an RX reorder "
2323 "frame due to timeout on earlier "
2324 "frames\n",
2325 wiphy_name(hw->wiphy));
2326#endif
2327 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
2328
2329 /*
2330 * Increment the head seq# also for the skipped slots.
2331 */
2332 tid_agg_rx->head_seq_num =
2333 (tid_agg_rx->head_seq_num + skipped) &
2334 SEQ_MASK;
2335 skipped = 0;
2336 }
2337 } else while (tid_agg_rx->reorder_buf[index]) {
Jouni Malinen2d3babd2009-05-05 20:35:13 +03002338 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002339 index = seq_sub(tid_agg_rx->head_seq_num,
2340 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2341 }
2342 return 1;
2343}
2344
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002345static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
Johannes Bergf1d58c22009-06-17 13:13:00 +02002346 struct sk_buff *skb)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002347{
2348 struct ieee80211_hw *hw = &local->hw;
2349 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2350 struct sta_info *sta;
2351 struct tid_ampdu_rx *tid_agg_rx;
Harvey Harrison87228f52008-06-11 14:21:59 -07002352 u16 sc;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002353 u16 mpdu_seq_num;
Harvey Harrison182503a2008-06-22 16:45:29 -07002354 u8 ret = 0;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002355 int tid;
2356
2357 sta = sta_info_get(local, hdr->addr2);
2358 if (!sta)
2359 return ret;
2360
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002361 /* filter the QoS data rx stream according to
2362 * STA/TID and check if this STA/TID is on aggregation */
Harvey Harrison87228f52008-06-11 14:21:59 -07002363 if (!ieee80211_is_data_qos(hdr->frame_control))
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002364 goto end_reorder;
2365
Harvey Harrison238f74a2008-07-02 11:05:34 -07002366 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002367
Ron Rindjunskycee24a32008-03-26 20:36:03 +02002368 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002369 goto end_reorder;
2370
Ron Rindjunskycee24a32008-03-26 20:36:03 +02002371 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2372
Emmanuel Grumbach2560b6e2008-07-10 00:47:19 +03002373 /* qos null data frames are excluded */
2374 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002375 goto end_reorder;
2376
2377 /* new un-ordered ampdu frame - process it */
2378
2379 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01002380 if (tid_agg_rx->timeout)
2381 mod_timer(&tid_agg_rx->session_timer,
2382 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002383
2384 /* if this mpdu is fragmented - terminate rx aggregation session */
2385 sc = le16_to_cpu(hdr->seq_ctrl);
2386 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Berg17741cd2008-09-11 00:02:02 +02002387 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002388 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2389 ret = 1;
2390 goto end_reorder;
2391 }
2392
2393 /* according to mpdu sequence number deal with reordering buffer */
2394 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
Johannes Bergf1d58c22009-06-17 13:13:00 +02002395 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002396 mpdu_seq_num, 0);
Johannes Bergd0709a62008-02-25 16:27:46 +01002397 end_reorder:
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002398 return ret;
2399}
2400
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002401/*
2402 * This is the receive path handler. It is called by a low level driver when an
2403 * 802.11 MPDU is received from the hardware.
2404 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002405void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002406{
2407 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01002408 struct ieee80211_rate *rate = NULL;
2409 struct ieee80211_supported_band *sband;
Johannes Bergf1d58c22009-06-17 13:13:00 +02002410 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg8318d782008-01-24 19:38:38 +01002411
2412 if (status->band < 0 ||
Adrian Bunk13d8fd22008-04-23 12:51:28 +03002413 status->band >= IEEE80211_NUM_BANDS) {
Johannes Berg8318d782008-01-24 19:38:38 +01002414 WARN_ON(1);
2415 return;
2416 }
2417
2418 sband = local->hw.wiphy->bands[status->band];
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002419 if (!sband) {
Johannes Berg8318d782008-01-24 19:38:38 +01002420 WARN_ON(1);
2421 return;
2422 }
2423
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002424 if (status->flag & RX_FLAG_HT) {
2425 /* rate_idx is MCS index */
2426 if (WARN_ON(status->rate_idx < 0 ||
2427 status->rate_idx >= 76))
2428 return;
2429 /* HT rates are not in the table - use the highest legacy rate
2430 * for now since other parts of mac80211 may not yet be fully
2431 * MCS aware. */
2432 rate = &sband->bitrates[sband->n_bitrates - 1];
2433 } else {
2434 if (WARN_ON(status->rate_idx < 0 ||
2435 status->rate_idx >= sband->n_bitrates))
2436 return;
2437 rate = &sband->bitrates[status->rate_idx];
2438 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002439
2440 /*
2441 * key references and virtual interfaces are protected using RCU
2442 * and this requires that we are in a read-side RCU section during
2443 * receive processing
2444 */
2445 rcu_read_lock();
2446
2447 /*
2448 * Frames with failed FCS/PLCP checksum are not returned,
2449 * all other frames are returned without radiotap header
2450 * if it was previously present.
2451 * Also, frames with less than 16 bytes are dropped.
2452 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002453 skb = ieee80211_rx_monitor(local, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002454 if (!skb) {
2455 rcu_read_unlock();
2456 return;
2457 }
2458
Jouni Malinenaec67952009-05-05 20:35:15 +03002459 /*
2460 * In theory, the block ack reordering should happen after duplicate
2461 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2462 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2463 * happen as a new RX handler between ieee80211_rx_h_check and
2464 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2465 * the time being, the call can be here since RX reorder buf processing
2466 * will implicitly skip duplicates. We could, in theory at least,
2467 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2468 * frames from other than operational channel), but that should not
2469 * happen in normal networks.
2470 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002471 if (!ieee80211_rx_reorder_ampdu(local, skb))
2472 __ieee80211_rx_handle_packet(hw, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002473
2474 rcu_read_unlock();
2475}
Johannes Berg571ecf62007-07-27 15:43:22 +02002476EXPORT_SYMBOL(__ieee80211_rx);
2477
2478/* This is a version of the rx handler that can be called from hard irq
2479 * context. Post the skb on the queue and schedule the tasklet */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002480void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02002481{
2482 struct ieee80211_local *local = hw_to_local(hw);
2483
2484 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2485
2486 skb->dev = local->mdev;
Johannes Berg571ecf62007-07-27 15:43:22 +02002487 skb->pkt_type = IEEE80211_RX_MSG;
2488 skb_queue_tail(&local->skb_queue, skb);
2489 tasklet_schedule(&local->tasklet);
2490}
2491EXPORT_SYMBOL(ieee80211_rx_irqsafe);