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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>
Johannes Berg84040802010-02-15 12:46:39 +02005 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
Johannes Berg571ecf62007-07-27 15:43:22 +02006 *
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020014#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
Johannes Bergd4e46a32007-09-14 11:10:24 -040018#include <linux/rcupdate.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020019#include <net/mac80211.h>
20#include <net/ieee80211_radiotap.h>
21
22#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020023#include "driver-ops.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040024#include "led.h"
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +010025#include "mesh.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020026#include "wep.h"
27#include "wpa.h"
28#include "tkip.h"
29#include "wme.h"
30
Johannes Bergb2e77712007-09-26 15:19:39 +020031/*
32 * monitor mode reception
33 *
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
36 */
37static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
Johannes Berg0869aea2009-10-28 10:03:35 +010038 struct sk_buff *skb)
Johannes Bergb2e77712007-09-26 15:19:39 +020039{
Johannes Bergb2e77712007-09-26 15:19:39 +020040 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
Zhu Yie3cf8b32010-03-29 17:35:07 +080042 __pskb_trim(skb, skb->len - FCS_LEN);
Johannes Bergb2e77712007-09-26 15:19:39 +020043 else {
44 /* driver bug */
45 WARN_ON(1);
46 dev_kfree_skb(skb);
47 skb = NULL;
48 }
49 }
50
51 return skb;
52}
53
Johannes Bergf1d58c22009-06-17 13:13:00 +020054static inline int should_drop_frame(struct sk_buff *skb,
Johannes Berg0869aea2009-10-28 10:03:35 +010055 int present_fcs_len)
Johannes Bergb2e77712007-09-26 15:19:39 +020056{
Johannes Bergf1d58c22009-06-17 13:13:00 +020057 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Harvey Harrison182503a2008-06-22 16:45:29 -070058 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Bergb2e77712007-09-26 15:19:39 +020059
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 return 1;
Johannes Berg0869aea2009-10-28 10:03:35 +010062 if (unlikely(skb->len < 16 + present_fcs_len))
Johannes Bergb2e77712007-09-26 15:19:39 +020063 return 1;
Harvey Harrison87228f52008-06-11 14:21:59 -070064 if (ieee80211_is_ctl(hdr->frame_control) &&
65 !ieee80211_is_pspoll(hdr->frame_control) &&
66 !ieee80211_is_back_req(hdr->frame_control))
Johannes Bergb2e77712007-09-26 15:19:39 +020067 return 1;
68 return 0;
69}
70
Bruno Randolf601ae7f2008-05-08 19:22:43 +020071static int
72ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73 struct ieee80211_rx_status *status)
74{
75 int len;
76
77 /* always present fields */
78 len = sizeof(struct ieee80211_radiotap_header) + 9;
79
Johannes Berg6ebacbb2011-02-23 15:06:08 +010080 if (status->flag & RX_FLAG_MACTIME_MPDU)
Bruno Randolf601ae7f2008-05-08 19:22:43 +020081 len += 8;
Johannes Berg7fee5372009-01-30 11:13:06 +010082 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
Bruno Randolf601ae7f2008-05-08 19:22:43 +020083 len += 1;
Bruno Randolf601ae7f2008-05-08 19:22:43 +020084
85 if (len & 1) /* padding for RX_FLAGS if necessary */
86 len++;
87
Johannes Berg6d744ba2011-01-27 14:13:17 +010088 if (status->flag & RX_FLAG_HT) /* HT info */
89 len += 3;
90
Bruno Randolf601ae7f2008-05-08 19:22:43 +020091 return len;
92}
93
Johannes Bergd1c3a372009-01-07 00:26:10 +010094/*
Bruno Randolf601ae7f2008-05-08 19:22:43 +020095 * ieee80211_add_rx_radiotap_header - add radiotap header
96 *
97 * add a radiotap header containing all the fields which the hardware provided.
98 */
99static void
100ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
101 struct sk_buff *skb,
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200102 struct ieee80211_rate *rate,
103 int rtap_len)
104{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200105 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200106 struct ieee80211_radiotap_header *rthdr;
107 unsigned char *pos;
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100108 u16 rx_flags = 0;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200109
110 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
111 memset(rthdr, 0, rtap_len);
112
113 /* radiotap header, set always present flags */
114 rthdr->it_present =
115 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200116 (1 << IEEE80211_RADIOTAP_CHANNEL) |
117 (1 << IEEE80211_RADIOTAP_ANTENNA) |
118 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
119 rthdr->it_len = cpu_to_le16(rtap_len);
120
121 pos = (unsigned char *)(rthdr+1);
122
123 /* the order of the following fields is important */
124
125 /* IEEE80211_RADIOTAP_TSFT */
Johannes Berg6ebacbb2011-02-23 15:06:08 +0100126 if (status->flag & RX_FLAG_MACTIME_MPDU) {
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100127 put_unaligned_le64(status->mactime, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200128 rthdr->it_present |=
129 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
130 pos += 8;
131 }
132
133 /* IEEE80211_RADIOTAP_FLAGS */
134 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
135 *pos |= IEEE80211_RADIOTAP_F_FCS;
Johannes Bergaae89832009-03-13 12:52:10 +0100136 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
137 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
Bruno Randolfb4f28bb2008-07-30 17:19:55 +0200138 if (status->flag & RX_FLAG_SHORTPRE)
139 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200140 pos++;
141
142 /* IEEE80211_RADIOTAP_RATE */
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200143 if (status->flag & RX_FLAG_HT) {
144 /*
Mohammed Shafi Shajakhan38f37be2011-02-07 10:10:04 +0530145 * MCS information is a separate field in radiotap,
Johannes Berg73b48092011-04-18 17:05:21 +0200146 * added below. The byte here is needed as padding
147 * for the channel though, so initialise it to 0.
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200148 */
149 *pos = 0;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200150 } else {
Jouni Malinenebe6c7b2009-01-10 11:47:33 +0200151 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200152 *pos = rate->bitrate / 5;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200153 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200154 pos++;
155
156 /* IEEE80211_RADIOTAP_CHANNEL */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100157 put_unaligned_le16(status->freq, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200158 pos += 2;
159 if (status->band == IEEE80211_BAND_5GHZ)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100160 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
161 pos);
Johannes Berg5f0b7de2009-11-16 13:58:21 +0100162 else if (status->flag & RX_FLAG_HT)
163 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
164 pos);
Bruno Randolf9deb1ae2008-07-30 17:20:06 +0200165 else if (rate->flags & IEEE80211_RATE_ERP_G)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100166 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
167 pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200168 else
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100169 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
170 pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200171 pos += 2;
172
173 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
174 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
175 *pos = status->signal;
176 rthdr->it_present |=
177 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
178 pos++;
179 }
180
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200181 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
182
183 /* IEEE80211_RADIOTAP_ANTENNA */
184 *pos = status->antenna;
185 pos++;
186
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200187 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
188
189 /* IEEE80211_RADIOTAP_RX_FLAGS */
190 /* ensure 2 byte alignment for the 2 byte field as required */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100191 if ((pos - (u8 *)rthdr) & 1)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200192 pos++;
Johannes Bergaae89832009-03-13 12:52:10 +0100193 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100194 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
195 put_unaligned_le16(rx_flags, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200196 pos += 2;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100197
198 if (status->flag & RX_FLAG_HT) {
199 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
200 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
201 IEEE80211_RADIOTAP_MCS_HAVE_GI |
202 IEEE80211_RADIOTAP_MCS_HAVE_BW;
203 *pos = 0;
204 if (status->flag & RX_FLAG_SHORT_GI)
205 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
206 if (status->flag & RX_FLAG_40MHZ)
207 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
208 pos++;
209 *pos++ = status->rate_idx;
210 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200211}
212
Johannes Bergb2e77712007-09-26 15:19:39 +0200213/*
214 * This function copies a received frame to all monitor interfaces and
215 * returns a cleaned-up SKB that no longer includes the FCS nor the
216 * radiotap header the driver might have added.
217 */
218static struct sk_buff *
219ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
Johannes Berg8318d782008-01-24 19:38:38 +0100220 struct ieee80211_rate *rate)
Johannes Bergb2e77712007-09-26 15:19:39 +0200221{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200222 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200223 struct ieee80211_sub_if_data *sdata;
Johannes Bergb2e77712007-09-26 15:19:39 +0200224 int needed_headroom = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200225 struct sk_buff *skb, *skb2;
226 struct net_device *prev_dev = NULL;
227 int present_fcs_len = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200228
229 /*
230 * First, we may need to make a copy of the skb because
231 * (1) we need to modify it for radiotap (if not present), and
232 * (2) the other RX handlers will modify the skb we got.
233 *
234 * We don't need to, of course, if we aren't going to return
235 * the SKB because it has a bad FCS/PLCP checksum.
236 */
Johannes Berg0869aea2009-10-28 10:03:35 +0100237
238 /* room for the radiotap header based on driver features */
239 needed_headroom = ieee80211_rx_radiotap_len(local, status);
Johannes Bergb2e77712007-09-26 15:19:39 +0200240
241 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
242 present_fcs_len = FCS_LEN;
243
Zhu Yie3cf8b32010-03-29 17:35:07 +0800244 /* make sure hdr->frame_control is on the linear part */
245 if (!pskb_may_pull(origskb, 2)) {
246 dev_kfree_skb(origskb);
247 return NULL;
248 }
249
Johannes Bergb2e77712007-09-26 15:19:39 +0200250 if (!local->monitors) {
Johannes Berg0869aea2009-10-28 10:03:35 +0100251 if (should_drop_frame(origskb, present_fcs_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200252 dev_kfree_skb(origskb);
253 return NULL;
254 }
255
Johannes Berg0869aea2009-10-28 10:03:35 +0100256 return remove_monitor_info(local, origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200257 }
258
Johannes Berg0869aea2009-10-28 10:03:35 +0100259 if (should_drop_frame(origskb, present_fcs_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200260 /* only need to expand headroom if necessary */
261 skb = origskb;
262 origskb = NULL;
263
264 /*
265 * This shouldn't trigger often because most devices have an
266 * RX header they pull before we get here, and that should
267 * be big enough for our radiotap information. We should
268 * probably export the length to drivers so that we can have
269 * them allocate enough headroom to start with.
270 */
271 if (skb_headroom(skb) < needed_headroom &&
Johannes Bergc49e5ea2007-12-11 21:33:42 +0100272 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200273 dev_kfree_skb(skb);
274 return NULL;
275 }
276 } else {
277 /*
278 * Need to make a copy and possibly remove radiotap header
279 * and FCS from the original.
280 */
281 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
282
Johannes Berg0869aea2009-10-28 10:03:35 +0100283 origskb = remove_monitor_info(local, origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200284
285 if (!skb)
286 return origskb;
287 }
288
Johannes Berg0869aea2009-10-28 10:03:35 +0100289 /* prepend radiotap information */
290 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
Johannes Bergb2e77712007-09-26 15:19:39 +0200291
Johannes Bergce3edf6d02007-12-19 01:31:22 +0100292 skb_reset_mac_header(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200293 skb->ip_summed = CHECKSUM_UNNECESSARY;
294 skb->pkt_type = PACKET_OTHERHOST;
295 skb->protocol = htons(ETH_P_802_2);
296
297 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200298 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +0200299 continue;
300
Michael Wu3d30d942008-01-31 19:48:27 +0100301 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
302 continue;
303
Johannes Berg9607e6b2009-12-23 13:15:31 +0100304 if (!ieee80211_sdata_running(sdata))
Johannes Berg47846c92009-11-25 17:46:19 +0100305 continue;
306
Johannes Bergb2e77712007-09-26 15:19:39 +0200307 if (prev_dev) {
308 skb2 = skb_clone(skb, GFP_ATOMIC);
309 if (skb2) {
310 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400311 netif_receive_skb(skb2);
Johannes Bergb2e77712007-09-26 15:19:39 +0200312 }
313 }
314
315 prev_dev = sdata->dev;
316 sdata->dev->stats.rx_packets++;
317 sdata->dev->stats.rx_bytes += skb->len;
318 }
319
320 if (prev_dev) {
321 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400322 netif_receive_skb(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200323 } else
324 dev_kfree_skb(skb);
325
326 return origskb;
327}
328
329
Johannes Berg5cf121c2008-02-25 16:27:43 +0100330static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200331{
Harvey Harrison238f74a2008-07-02 11:05:34 -0700332 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +0200333 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
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 Berg554891e2010-09-24 12:38:25 +0200342 status->rx_flags |= IEEE80211_RX_AMSDU;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200343 } else {
Johannes Berg1411f9b2008-07-10 10:11:02 +0200344 /*
345 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
346 *
347 * Sequence numbers for management frames, QoS data
348 * frames with a broadcast/multicast address in the
349 * Address 1 field, and all non-QoS data frames sent
350 * by QoS STAs are assigned using an additional single
351 * modulo-4096 counter, [...]
352 *
353 * We also use that counter for non-QoS STAs.
354 */
355 tid = NUM_RX_DATA_QUEUES - 1;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200356 }
Johannes Berg52865dfd2007-07-27 15:43:22 +0200357
Johannes Berg5cf121c2008-02-25 16:27:43 +0100358 rx->queue = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200359 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
360 * For now, set skb->priority to 0 for other cases. */
361 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100362}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200363
Johannes Bergd1c3a372009-01-07 00:26:10 +0100364/**
365 * DOC: Packet alignment
366 *
367 * Drivers always need to pass packets that are aligned to two-byte boundaries
368 * to the stack.
369 *
370 * Additionally, should, if possible, align the payload data in a way that
371 * guarantees that the contained IP header is aligned to a four-byte
372 * boundary. In the case of regular frames, this simply means aligning the
373 * payload to a four-byte boundary (because either the IP header is directly
374 * contained, or IV/RFC1042 headers that have a length divisible by four are
Kalle Valo59d9cb02009-12-17 13:54:57 +0100375 * in front of it). If the payload data is not properly aligned and the
376 * architecture doesn't support efficient unaligned operations, mac80211
377 * will align the data.
Johannes Bergd1c3a372009-01-07 00:26:10 +0100378 *
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 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300385 * Padding like Atheros hardware adds which is between the 802.11 header and
Johannes Bergd1c3a372009-01-07 00:26:10 +0100386 * 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{
Kalle Valo59d9cb02009-12-17 13:54:57 +0100391#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
392 WARN_ONCE((unsigned long)rx->skb->data & 1,
393 "unaligned packet at 0x%p\n", rx->skb->data);
Johannes Bergd1c3a372009-01-07 00:26:10 +0100394#endif
Johannes Berg6e0d1142007-07-27 15:43:22 +0200395}
396
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +0200397
Johannes Berg571ecf62007-07-27 15:43:22 +0200398/* rx handlers */
399
Johannes Berg49461622008-06-30 15:10:45 +0200400static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100401ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200402{
403 struct ieee80211_local *local = rx->local;
Johannes Berg554891e2010-09-24 12:38:25 +0200404 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200405 struct sk_buff *skb = rx->skb;
406
Luciano Coelho79f460c2011-05-11 17:09:36 +0300407 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
408 !local->sched_scanning))
Johannes Berg4080c7c2010-09-24 11:21:08 +0200409 return RX_CONTINUE;
410
Ben Greearb23b0252011-02-04 11:54:17 -0800411 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
Luciano Coelho79f460c2011-05-11 17:09:36 +0300412 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
413 local->sched_scanning)
Johannes Bergf1d58c22009-06-17 13:13:00 +0200414 return ieee80211_scan_rx(rx->sdata, skb);
Zhu Yiece8edd2007-11-22 10:53:21 +0800415
Johannes Berg4080c7c2010-09-24 11:21:08 +0200416 /* scanning finished during invoking of handlers */
417 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
418 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200419}
420
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200421
422static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
423{
424 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
425
426 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
427 return 0;
428
429 return ieee80211_is_robust_mgmt_frame(hdr);
430}
431
432
433static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
434{
435 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
436
437 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
438 return 0;
439
440 return ieee80211_is_robust_mgmt_frame(hdr);
441}
442
443
444/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
445static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
446{
447 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
448 struct ieee80211_mmie *mmie;
449
450 if (skb->len < 24 + sizeof(*mmie) ||
451 !is_multicast_ether_addr(hdr->da))
452 return -1;
453
454 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
455 return -1; /* not a robust management frame */
456
457 mmie = (struct ieee80211_mmie *)
458 (skb->data + skb->len - sizeof(*mmie));
459 if (mmie->element_id != WLAN_EID_MMIE ||
460 mmie->length != sizeof(*mmie) - 2)
461 return -1;
462
463 return le16_to_cpu(mmie->key_id);
464}
465
466
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100467static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100468ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100469{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700470 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
471 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg47846c92009-11-25 17:46:19 +0100472 char *dev_addr = rx->sdata->vif.addr;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100473
Harvey Harrisona7767f92008-07-02 16:30:51 -0700474 if (ieee80211_is_data(hdr->frame_control)) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700475 if (is_multicast_ether_addr(hdr->addr1)) {
476 if (ieee80211_has_tods(hdr->frame_control) ||
477 !ieee80211_has_fromds(hdr->frame_control))
478 return RX_DROP_MONITOR;
479 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
480 return RX_DROP_MONITOR;
481 } else {
482 if (!ieee80211_has_a4(hdr->frame_control))
483 return RX_DROP_MONITOR;
484 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
485 return RX_DROP_MONITOR;
486 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100487 }
488
489 /* If there is not an established peer link and this is not a peer link
490 * establisment frame, beacon or probe, drop the frame.
491 */
492
Javier Cardona57cf8042011-05-13 10:45:43 -0700493 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100494 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100495
Harvey Harrisona7767f92008-07-02 16:30:51 -0700496 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100497 return RX_DROP_MONITOR;
498
Harvey Harrisona7767f92008-07-02 16:30:51 -0700499 if (ieee80211_is_action(hdr->frame_control)) {
Javier Cardonad3aaec8a2011-05-03 16:57:09 -0700500 u8 category;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100501 mgmt = (struct ieee80211_mgmt *)hdr;
Javier Cardonad3aaec8a2011-05-03 16:57:09 -0700502 category = mgmt->u.action.category;
503 if (category != WLAN_CATEGORY_MESH_ACTION &&
504 category != WLAN_CATEGORY_SELF_PROTECTED)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100505 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100506 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100507 }
508
Harvey Harrisona7767f92008-07-02 16:30:51 -0700509 if (ieee80211_is_probe_req(hdr->frame_control) ||
510 ieee80211_is_probe_resp(hdr->frame_control) ||
Javier Cardona71839122011-04-07 15:08:31 -0700511 ieee80211_is_beacon(hdr->frame_control) ||
512 ieee80211_is_auth(hdr->frame_control))
Harvey Harrisona7767f92008-07-02 16:30:51 -0700513 return RX_CONTINUE;
514
515 return RX_DROP_MONITOR;
516
517 }
518
519#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
520
521 if (ieee80211_is_data(hdr->frame_control) &&
522 is_multicast_ether_addr(hdr->addr1) &&
Javier Cardona3c5772a2009-08-10 12:15:48 -0700523 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100524 return RX_DROP_MONITOR;
Johannes Berg902acc72008-02-23 15:17:19 +0100525#undef msh_h_get
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100526
Johannes Berg902acc72008-02-23 15:17:19 +0100527 return RX_CONTINUE;
528}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100529
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100530#define SEQ_MODULO 0x1000
531#define SEQ_MASK 0xfff
532
533static inline int seq_less(u16 sq1, u16 sq2)
534{
535 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
536}
537
538static inline u16 seq_inc(u16 sq)
539{
540 return (sq + 1) & SEQ_MASK;
541}
542
543static inline u16 seq_sub(u16 sq1, u16 sq2)
544{
545 return (sq1 - sq2) & SEQ_MASK;
546}
547
548
549static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
550 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100551 int index)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100552{
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100553 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100554 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
Christian Lamparter4cfda472010-12-27 23:21:26 +0100555 struct ieee80211_rx_status *status;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100556
Johannes Bergdd318572010-11-29 11:09:16 +0100557 lockdep_assert_held(&tid_agg_rx->reorder_lock);
558
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100559 if (!skb)
560 goto no_frame;
561
Christian Lamparter071d9ac2010-08-05 01:36:36 +0200562 /* release the frame from the reorder ring buffer */
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100563 tid_agg_rx->stored_mpdu_num--;
564 tid_agg_rx->reorder_buf[index] = NULL;
Christian Lamparter4cfda472010-12-27 23:21:26 +0100565 status = IEEE80211_SKB_RXCB(skb);
566 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100567 skb_queue_tail(&local->rx_skb_queue, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100568
569no_frame:
570 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
571}
572
573static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
574 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100575 u16 head_seq_num)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100576{
577 int index;
578
Johannes Bergdd318572010-11-29 11:09:16 +0100579 lockdep_assert_held(&tid_agg_rx->reorder_lock);
580
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100581 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
582 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
583 tid_agg_rx->buf_size;
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100584 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100585 }
586}
587
588/*
589 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
590 * the skb was added to the buffer longer than this time ago, the earlier
591 * frames that have not yet been received are assumed to be lost and the skb
592 * can be released for processing. This may also release other skb's from the
593 * reorder buffer if there are no additional gaps between the frames.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200594 *
595 * Callers must hold tid_agg_rx->reorder_lock.
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100596 */
597#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
598
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200599static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100600 struct tid_ampdu_rx *tid_agg_rx)
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200601{
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200602 int index, j;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200603
Johannes Bergdd318572010-11-29 11:09:16 +0100604 lockdep_assert_held(&tid_agg_rx->reorder_lock);
605
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200606 /* release the buffer until next missing frame */
607 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
608 tid_agg_rx->buf_size;
609 if (!tid_agg_rx->reorder_buf[index] &&
610 tid_agg_rx->stored_mpdu_num > 1) {
611 /*
612 * No buffers ready to be released, but check whether any
613 * frames in the reorder buffer have timed out.
614 */
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200615 int skipped = 1;
616 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
617 j = (j + 1) % tid_agg_rx->buf_size) {
618 if (!tid_agg_rx->reorder_buf[j]) {
619 skipped++;
620 continue;
621 }
Daniel Halperin499fe9a2011-03-24 16:01:48 -0700622 if (skipped &&
623 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200624 HT_RX_REORDER_BUF_TIMEOUT))
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200625 goto set_release_timer;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200626
627#ifdef CONFIG_MAC80211_HT_DEBUG
628 if (net_ratelimit())
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700629 wiphy_debug(hw->wiphy,
630 "release an RX reorder frame due to timeout on earlier frames\n");
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200631#endif
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100632 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200633
634 /*
635 * Increment the head seq# also for the skipped slots.
636 */
637 tid_agg_rx->head_seq_num =
638 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
639 skipped = 0;
640 }
641 } else while (tid_agg_rx->reorder_buf[index]) {
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100642 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200643 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
644 tid_agg_rx->buf_size;
645 }
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200646
647 if (tid_agg_rx->stored_mpdu_num) {
648 j = index = seq_sub(tid_agg_rx->head_seq_num,
649 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
650
651 for (; j != (index - 1) % tid_agg_rx->buf_size;
652 j = (j + 1) % tid_agg_rx->buf_size) {
653 if (tid_agg_rx->reorder_buf[j])
654 break;
655 }
656
657 set_release_timer:
658
659 mod_timer(&tid_agg_rx->reorder_timer,
Christian Lamparter334df732011-04-24 20:41:16 +0200660 tid_agg_rx->reorder_time[j] + 1 +
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200661 HT_RX_REORDER_BUF_TIMEOUT);
662 } else {
663 del_timer(&tid_agg_rx->reorder_timer);
664 }
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200665}
666
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100667/*
668 * As this function belongs to the RX path it must be under
669 * rcu_read_lock protection. It returns false if the frame
670 * can be processed immediately, true if it was consumed.
671 */
672static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
673 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100674 struct sk_buff *skb)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100675{
676 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
677 u16 sc = le16_to_cpu(hdr->seq_ctrl);
678 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
679 u16 head_seq_num, buf_size;
680 int index;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200681 bool ret = true;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100682
Johannes Bergdd318572010-11-29 11:09:16 +0100683 spin_lock(&tid_agg_rx->reorder_lock);
684
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100685 buf_size = tid_agg_rx->buf_size;
686 head_seq_num = tid_agg_rx->head_seq_num;
687
688 /* frame with out of date sequence number */
689 if (seq_less(mpdu_seq_num, head_seq_num)) {
690 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200691 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100692 }
693
694 /*
695 * If frame the sequence number exceeds our buffering window
696 * size release some previous frames to make room for this one.
697 */
698 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
699 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
700 /* release stored frames up to new head to stack */
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100701 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100702 }
703
704 /* Now the new frame is always in the range of the reordering buffer */
705
706 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
707
708 /* check if we already stored this frame */
709 if (tid_agg_rx->reorder_buf[index]) {
710 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200711 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100712 }
713
714 /*
715 * If the current MPDU is in the right order and nothing else
716 * is stored we can process it directly, no need to buffer it.
Johannes Bergc835b212011-03-15 23:17:01 +0100717 * If it is first but there's something stored, we may be able
718 * to release frames after this one.
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100719 */
720 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
721 tid_agg_rx->stored_mpdu_num == 0) {
722 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200723 ret = false;
724 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100725 }
726
727 /* put the frame in the reordering buffer */
728 tid_agg_rx->reorder_buf[index] = skb;
729 tid_agg_rx->reorder_time[index] = jiffies;
730 tid_agg_rx->stored_mpdu_num++;
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100731 ieee80211_sta_reorder_release(hw, tid_agg_rx);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100732
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200733 out:
734 spin_unlock(&tid_agg_rx->reorder_lock);
735 return ret;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100736}
737
738/*
739 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
740 * true if the MPDU was buffered, false if it should be processed.
741 */
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100742static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100743{
Johannes Berg2569a822009-11-25 17:46:17 +0100744 struct sk_buff *skb = rx->skb;
745 struct ieee80211_local *local = rx->local;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100746 struct ieee80211_hw *hw = &local->hw;
747 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Johannes Berg2569a822009-11-25 17:46:17 +0100748 struct sta_info *sta = rx->sta;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100749 struct tid_ampdu_rx *tid_agg_rx;
750 u16 sc;
751 int tid;
752
753 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg2569a822009-11-25 17:46:17 +0100754 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100755
756 /*
757 * filter the QoS data rx stream according to
758 * STA/TID and check if this STA/TID is on aggregation
759 */
760
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100761 if (!sta)
Johannes Berg2569a822009-11-25 17:46:17 +0100762 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100763
764 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
765
Johannes Berga87f7362010-06-10 10:21:38 +0200766 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
767 if (!tid_agg_rx)
768 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100769
770 /* qos null data frames are excluded */
771 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Johannes Berga87f7362010-06-10 10:21:38 +0200772 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100773
774 /* new, potentially un-ordered, ampdu frame - process it */
775
776 /* reset session timer */
777 if (tid_agg_rx->timeout)
778 mod_timer(&tid_agg_rx->session_timer,
779 TU_TO_EXP_TIME(tid_agg_rx->timeout));
780
781 /* if this mpdu is fragmented - terminate rx aggregation session */
782 sc = le16_to_cpu(hdr->seq_ctrl);
783 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Bergc1475ca2010-06-10 10:21:37 +0200784 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg344eec62010-06-10 10:21:36 +0200785 skb_queue_tail(&rx->sdata->skb_queue, skb);
786 ieee80211_queue_work(&local->hw, &rx->sdata->work);
Johannes Berg2569a822009-11-25 17:46:17 +0100787 return;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100788 }
789
Johannes Berga87f7362010-06-10 10:21:38 +0200790 /*
791 * No locking needed -- we will only ever process one
792 * RX packet at a time, and thus own tid_agg_rx. All
793 * other code manipulating it needs to (and does) make
794 * sure that we cannot get to it any more before doing
795 * anything with it.
796 */
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100797 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
Johannes Berg2569a822009-11-25 17:46:17 +0100798 return;
799
800 dont_reorder:
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100801 skb_queue_tail(&local->rx_skb_queue, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100802}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100803
Johannes Berg49461622008-06-30 15:10:45 +0200804static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100805ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200806{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700807 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +0200808 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200809
810 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
811 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700812 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100813 rx->sta->last_seq_ctrl[rx->queue] ==
Johannes Berg571ecf62007-07-27 15:43:22 +0200814 hdr->seq_ctrl)) {
Johannes Berg554891e2010-09-24 12:38:25 +0200815 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200816 rx->local->dot11FrameDuplicateCount++;
817 rx->sta->num_duplicates++;
818 }
Felix Fietkaub1f93312011-02-04 19:20:08 +0100819 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200820 } else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100821 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +0200822 }
823
Johannes Berg571ecf62007-07-27 15:43:22 +0200824 if (unlikely(rx->skb->len < 16)) {
825 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100826 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200827 }
828
Johannes Berg571ecf62007-07-27 15:43:22 +0200829 /* Drop disallowed frame classes based on STA auth/assoc state;
830 * IEEE 802.11, Chap 5.5.
831 *
Johannes Bergccd7b362008-09-11 00:01:56 +0200832 * mac80211 filters only based on association state, i.e. it drops
833 * Class 3 frames from not associated stations. hostapd sends
Johannes Berg571ecf62007-07-27 15:43:22 +0200834 * deauth/disassoc frames when needed. In addition, hostapd is
835 * responsible for filtering on both auth and assoc states.
836 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100837
Johannes Berg902acc72008-02-23 15:17:19 +0100838 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100839 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100840
Harvey Harrisona7767f92008-07-02 16:30:51 -0700841 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
842 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200843 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Bill Jordan1be7fe82010-10-01 11:20:41 -0400844 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
Helmut Schaa0c2530c2011-02-12 14:17:15 +0100845 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC))))
Johannes Berge4c26ad2008-01-31 19:48:21 +0100846 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200847
Johannes Berg9ae54c82008-01-31 19:48:20 +0100848 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +0200849}
850
851
Johannes Berg49461622008-06-30 15:10:45 +0200852static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100853ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
Johannes Berg570bd532007-07-27 15:43:22 +0200854{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100855 struct sk_buff *skb = rx->skb;
856 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
857 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg3017b802007-08-28 17:01:53 -0400858 int keyidx;
859 int hdrlen;
Johannes Berge4c26ad2008-01-31 19:48:21 +0100860 ieee80211_rx_result result = RX_DROP_UNUSABLE;
Johannes Berge31b8212010-10-05 19:39:30 +0200861 struct ieee80211_key *sta_ptk = NULL;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200862 int mmie_keyidx = -1;
Johannes Berg761ab472010-05-28 14:24:19 +0200863 __le16 fc;
Johannes Berg570bd532007-07-27 15:43:22 +0200864
Johannes Berg3017b802007-08-28 17:01:53 -0400865 /*
866 * Key selection 101
867 *
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200868 * There are four types of keys:
Johannes Berg3017b802007-08-28 17:01:53 -0400869 * - GTK (group keys)
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200870 * - IGTK (group keys for management frames)
Johannes Berg3017b802007-08-28 17:01:53 -0400871 * - PTK (pairwise keys)
872 * - STK (station-to-station pairwise keys)
873 *
874 * When selecting a key, we have to distinguish between multicast
875 * (including broadcast) and unicast frames, the latter can only
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200876 * use PTKs and STKs while the former always use GTKs and IGTKs.
877 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
878 * unicast frames can also use key indices like GTKs. Hence, if we
879 * don't have a PTK/STK we check the key index for a WEP key.
Johannes Berg3017b802007-08-28 17:01:53 -0400880 *
Johannes Berg8dc06a12007-08-28 17:01:55 -0400881 * Note that in a regular BSS, multicast frames are sent by the
882 * AP only, associated stations unicast the frame to the AP first
883 * which then multicasts it on their behalf.
884 *
Johannes Berg3017b802007-08-28 17:01:53 -0400885 * There is also a slight problem in IBSS mode: GTKs are negotiated
886 * with each station, that is something we don't currently handle.
Johannes Berg8dc06a12007-08-28 17:01:55 -0400887 * The spec seems to expect that one negotiates the same key with
888 * every station but there's no such requirement; VLANs could be
889 * possible.
Johannes Berg3017b802007-08-28 17:01:53 -0400890 */
Johannes Berg571ecf62007-07-27 15:43:22 +0200891
Johannes Berg3017b802007-08-28 17:01:53 -0400892 /*
Johannes Berg1990af82007-09-26 17:53:15 +0200893 * No point in finding a key and decrypting if the frame is neither
Johannes Berg3017b802007-08-28 17:01:53 -0400894 * addressed to us nor a multicast frame.
895 */
Johannes Berg554891e2010-09-24 12:38:25 +0200896 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100897 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -0400898
Johannes Berg2569a822009-11-25 17:46:17 +0100899 /* start without a key */
900 rx->key = NULL;
901
Johannes Bergd4e46a32007-09-14 11:10:24 -0400902 if (rx->sta)
Johannes Berge31b8212010-10-05 19:39:30 +0200903 sta_ptk = rcu_dereference(rx->sta->ptk);
Johannes Bergd4e46a32007-09-14 11:10:24 -0400904
Johannes Berg761ab472010-05-28 14:24:19 +0200905 fc = hdr->frame_control;
906
907 if (!ieee80211_has_protected(fc))
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300908 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
909
Johannes Berge31b8212010-10-05 19:39:30 +0200910 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
911 rx->key = sta_ptk;
Johannes Bergdc1580d2010-08-10 09:46:40 +0200912 if ((status->flag & RX_FLAG_DECRYPTED) &&
913 (status->flag & RX_FLAG_IV_STRIPPED))
914 return RX_CONTINUE;
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300915 /* Skip decryption if the frame is not protected. */
Johannes Berg761ab472010-05-28 14:24:19 +0200916 if (!ieee80211_has_protected(fc))
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300917 return RX_CONTINUE;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200918 } else if (mmie_keyidx >= 0) {
919 /* Broadcast/multicast robust management frame / BIP */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100920 if ((status->flag & RX_FLAG_DECRYPTED) &&
921 (status->flag & RX_FLAG_IV_STRIPPED))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200922 return RX_CONTINUE;
923
924 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
925 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
926 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
Johannes Berge31b8212010-10-05 19:39:30 +0200927 if (rx->sta)
928 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
929 if (!rx->key)
930 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
Johannes Berg761ab472010-05-28 14:24:19 +0200931 } else if (!ieee80211_has_protected(fc)) {
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300932 /*
933 * The frame was not protected, so skip decryption. However, we
934 * need to set rx->key if there is a key that could have been
935 * used so that the frame may be dropped if encryption would
936 * have been expected.
937 */
938 struct ieee80211_key *key = NULL;
Johannes Berg897bed82010-12-09 19:49:00 +0100939 struct ieee80211_sub_if_data *sdata = rx->sdata;
940 int i;
941
Johannes Berg761ab472010-05-28 14:24:19 +0200942 if (ieee80211_is_mgmt(fc) &&
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300943 is_multicast_ether_addr(hdr->addr1) &&
944 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
945 rx->key = key;
Johannes Berg897bed82010-12-09 19:49:00 +0100946 else {
947 if (rx->sta) {
948 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
949 key = rcu_dereference(rx->sta->gtk[i]);
950 if (key)
951 break;
952 }
953 }
954 if (!key) {
955 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
956 key = rcu_dereference(sdata->keys[i]);
957 if (key)
958 break;
959 }
960 }
961 if (key)
962 rx->key = key;
963 }
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300964 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200965 } else {
Zhu Yi39184b12010-04-08 15:35:10 +0800966 u8 keyid;
Johannes Berg3017b802007-08-28 17:01:53 -0400967 /*
968 * The device doesn't give us the IV so we won't be
969 * able to look up the key. That's ok though, we
970 * don't need to decrypt the frame, we just won't
971 * be able to keep statistics accurate.
972 * Except for key threshold notifications, should
973 * we somehow allow the driver to tell us which key
974 * the hardware used if this flag is set?
975 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100976 if ((status->flag & RX_FLAG_DECRYPTED) &&
977 (status->flag & RX_FLAG_IV_STRIPPED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100978 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200979
Johannes Berg761ab472010-05-28 14:24:19 +0200980 hdrlen = ieee80211_hdrlen(fc);
Johannes Berg571ecf62007-07-27 15:43:22 +0200981
Johannes Berg3017b802007-08-28 17:01:53 -0400982 if (rx->skb->len < 8 + hdrlen)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100983 return RX_DROP_UNUSABLE; /* TODO: count this? */
Johannes Berg571ecf62007-07-27 15:43:22 +0200984
Johannes Berg3017b802007-08-28 17:01:53 -0400985 /*
986 * no need to call ieee80211_wep_get_keyidx,
987 * it verifies a bunch of things we've done already
988 */
Zhu Yi39184b12010-04-08 15:35:10 +0800989 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
990 keyidx = keyid >> 6;
Johannes Berg3017b802007-08-28 17:01:53 -0400991
Johannes Berge31b8212010-10-05 19:39:30 +0200992 /* check per-station GTK first, if multicast packet */
993 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
994 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
Johannes Berg3017b802007-08-28 17:01:53 -0400995
Johannes Berge31b8212010-10-05 19:39:30 +0200996 /* if not found, try default key */
997 if (!rx->key) {
998 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
999
1000 /*
1001 * RSNA-protected unicast frames should always be
1002 * sent with pairwise or station-to-station keys,
1003 * but for WEP we allow using a key index as well.
1004 */
1005 if (rx->key &&
1006 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1007 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1008 !is_multicast_ether_addr(hdr->addr1))
1009 rx->key = NULL;
1010 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001011 }
1012
Johannes Berg3017b802007-08-28 17:01:53 -04001013 if (rx->key) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001014 rx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -04001015 /* TODO: add threshold stuff again */
Johannes Berg1990af82007-09-26 17:53:15 +02001016 } else {
Johannes Berge4c26ad2008-01-31 19:48:21 +01001017 return RX_DROP_MONITOR;
Johannes Berg70f08762007-09-26 17:53:14 +02001018 }
1019
Zhu Yi39184b12010-04-08 15:35:10 +08001020 if (skb_linearize(rx->skb))
1021 return RX_DROP_UNUSABLE;
Johannes Berg761ab472010-05-28 14:24:19 +02001022 /* the hdr variable is invalid now! */
Johannes Berg1990af82007-09-26 17:53:15 +02001023
Johannes Berg97359d12010-08-10 09:46:38 +02001024 switch (rx->key->conf.cipher) {
1025 case WLAN_CIPHER_SUITE_WEP40:
1026 case WLAN_CIPHER_SUITE_WEP104:
Johannes Berg761ab472010-05-28 14:24:19 +02001027 /* Check for weak IVs if possible */
1028 if (rx->sta && ieee80211_is_data(fc) &&
1029 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1030 !(status->flag & RX_FLAG_DECRYPTED)) &&
1031 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1032 rx->sta->wep_weak_iv_count++;
1033
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001034 result = ieee80211_crypto_wep_decrypt(rx);
1035 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001036 case WLAN_CIPHER_SUITE_TKIP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001037 result = ieee80211_crypto_tkip_decrypt(rx);
1038 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001039 case WLAN_CIPHER_SUITE_CCMP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001040 result = ieee80211_crypto_ccmp_decrypt(rx);
1041 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001042 case WLAN_CIPHER_SUITE_AES_CMAC:
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001043 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1044 break;
Johannes Berg3ffc2a92010-08-27 14:26:52 +03001045 default:
1046 /*
1047 * We can reach here only with HW-only algorithms
1048 * but why didn't it decrypt the frame?!
1049 */
1050 return RX_DROP_UNUSABLE;
Johannes Berg70f08762007-09-26 17:53:14 +02001051 }
1052
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001053 /* either the frame has been decrypted or will be dropped */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001054 status->flag |= RX_FLAG_DECRYPTED;
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001055
1056 return result;
Johannes Berg70f08762007-09-26 17:53:14 +02001057}
1058
Kalle Valo572e0012009-02-10 17:09:31 +02001059static ieee80211_rx_result debug_noinline
1060ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1061{
1062 struct ieee80211_local *local;
1063 struct ieee80211_hdr *hdr;
1064 struct sk_buff *skb;
1065
1066 local = rx->local;
1067 skb = rx->skb;
1068 hdr = (struct ieee80211_hdr *) skb->data;
1069
1070 if (!local->pspolling)
1071 return RX_CONTINUE;
1072
1073 if (!ieee80211_has_fromds(hdr->frame_control))
1074 /* this is not from AP */
1075 return RX_CONTINUE;
1076
1077 if (!ieee80211_is_data(hdr->frame_control))
1078 return RX_CONTINUE;
1079
1080 if (!ieee80211_has_moredata(hdr->frame_control)) {
1081 /* AP has no more frames buffered for us */
1082 local->pspolling = false;
1083 return RX_CONTINUE;
1084 }
1085
1086 /* more data bit is set, let's request a new frame from the AP */
1087 ieee80211_send_pspoll(local, rx->sdata);
1088
1089 return RX_CONTINUE;
1090}
1091
Johannes Berg133b8222008-09-16 14:18:59 +02001092static void ap_sta_ps_start(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001093{
Johannes Berg133b8222008-09-16 14:18:59 +02001094 struct ieee80211_sub_if_data *sdata = sta->sdata;
Christian Lamparter4571d3b2008-11-30 00:48:41 +01001095 struct ieee80211_local *local = sdata->local;
Joe Perches0795af52007-10-03 17:59:30 -07001096
Johannes Berg3e122be2008-07-09 14:40:34 +02001097 atomic_inc(&sdata->bss->num_sta_ps);
Johannes Bergaf818582009-11-06 11:35:50 +01001098 set_sta_flags(sta, WLAN_STA_PS_STA);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001099 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1100 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001101#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001102 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001103 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001104#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1105}
1106
Johannes Bergff9458d2009-10-30 12:56:02 +01001107static void ap_sta_ps_end(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001108{
Johannes Berg133b8222008-09-16 14:18:59 +02001109 struct ieee80211_sub_if_data *sdata = sta->sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02001110
Johannes Berg3e122be2008-07-09 14:40:34 +02001111 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg004c8722008-02-20 11:21:35 +01001112
Johannes Berg571ecf62007-07-27 15:43:22 +02001113#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001114 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001115 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001116#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg004c8722008-02-20 11:21:35 +01001117
Johannes Bergaf818582009-11-06 11:35:50 +01001118 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001119#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Bergaf818582009-11-06 11:35:50 +01001120 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001121 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001122#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Bergaf818582009-11-06 11:35:50 +01001123 return;
1124 }
1125
1126 ieee80211_sta_ps_deliver_wakeup(sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001127}
1128
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001129int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1130{
1131 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1132 bool in_ps;
1133
1134 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1135
1136 /* Don't let the same PS state be set twice */
1137 in_ps = test_sta_flags(sta_inf, WLAN_STA_PS_STA);
1138 if ((start && in_ps) || (!start && !in_ps))
1139 return -EINVAL;
1140
1141 if (start)
1142 ap_sta_ps_start(sta_inf);
1143 else
1144 ap_sta_ps_end(sta_inf);
1145
1146 return 0;
1147}
1148EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1149
Johannes Berg49461622008-06-30 15:10:45 +02001150static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001151ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001152{
1153 struct sta_info *sta = rx->sta;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001154 struct sk_buff *skb = rx->skb;
1155 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1156 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001157
1158 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001159 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001160
Johannes Bergb291ba12009-07-10 15:29:03 +02001161 /*
1162 * Update last_rx only for IBSS packets which are for the current
1163 * BSSID to avoid keeping the current IBSS network alive in cases
1164 * where other STAs start using different BSSID.
1165 */
Johannes Berg05c914f2008-09-11 00:01:58 +02001166 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001167 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +02001168 NL80211_IFTYPE_ADHOC);
Felix Fietkau3af63342011-02-27 22:08:01 +01001169 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001170 sta->last_rx = jiffies;
Felix Fietkau3af63342011-02-27 22:08:01 +01001171 if (ieee80211_is_data(hdr->frame_control)) {
1172 sta->last_rx_rate_idx = status->rate_idx;
1173 sta->last_rx_rate_flag = status->flag;
1174 }
1175 }
Johannes Bergb291ba12009-07-10 15:29:03 +02001176 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1177 /*
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001178 * Mesh beacons will update last_rx when if they are found to
1179 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +02001180 */
Johannes Bergb291ba12009-07-10 15:29:03 +02001181 sta->last_rx = jiffies;
Felix Fietkau3af63342011-02-27 22:08:01 +01001182 if (ieee80211_is_data(hdr->frame_control)) {
1183 sta->last_rx_rate_idx = status->rate_idx;
1184 sta->last_rx_rate_flag = status->flag;
1185 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001186 }
1187
Johannes Berg554891e2010-09-24 12:38:25 +02001188 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001189 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001190
Kalle Valo3cf335d2009-03-22 21:57:06 +02001191 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1192 ieee80211_sta_rx_notify(rx->sdata, hdr);
1193
Johannes Berg571ecf62007-07-27 15:43:22 +02001194 sta->rx_fragments++;
1195 sta->rx_bytes += rx->skb->len;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001196 sta->last_signal = status->signal;
Bruno Randolf541a45a2010-12-02 19:12:43 +09001197 ewma_add(&sta->avg_signal, -status->signal);
Johannes Berg571ecf62007-07-27 15:43:22 +02001198
Johannes Berg72eaa432008-11-26 15:02:58 +01001199 /*
1200 * Change STA power saving mode only at the end of a frame
1201 * exchange sequence.
1202 */
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001203 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1204 !ieee80211_has_morefrags(hdr->frame_control) &&
Christian Lamparter4cfda472010-12-27 23:21:26 +01001205 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001206 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1207 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
Johannes Bergaf818582009-11-06 11:35:50 +01001208 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
Johannes Berg72eaa432008-11-26 15:02:58 +01001209 /*
1210 * Ignore doze->wake transitions that are
1211 * indicated by non-data frames, the standard
1212 * is unclear here, but for example going to
1213 * PS mode and then scanning would cause a
1214 * doze->wake transition for the probe request,
1215 * and that is clearly undesirable.
1216 */
1217 if (ieee80211_is_data(hdr->frame_control) &&
1218 !ieee80211_has_pm(hdr->frame_control))
Johannes Bergff9458d2009-10-30 12:56:02 +01001219 ap_sta_ps_end(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001220 } else {
1221 if (ieee80211_has_pm(hdr->frame_control))
1222 ap_sta_ps_start(sta);
1223 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001224 }
1225
Johannes Berg22403de2009-10-30 12:55:03 +01001226 /*
1227 * Drop (qos-)data::nullfunc frames silently, since they
1228 * are used only to control station power saving mode.
1229 */
1230 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1231 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001232 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
Felix Fietkaud5242152010-01-08 18:06:26 +01001233
1234 /*
1235 * If we receive a 4-addr nullfunc frame from a STA
1236 * that was not moved to a 4-addr STA vlan yet, drop
1237 * the frame to the monitor interface, to make sure
1238 * that hostapd sees it
1239 */
1240 if (ieee80211_has_a4(hdr->frame_control) &&
1241 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1242 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1243 !rx->sdata->u.vlan.sta)))
1244 return RX_DROP_MONITOR;
Johannes Berg22403de2009-10-30 12:55:03 +01001245 /*
1246 * Update counter and free packet here to avoid
1247 * counting this as a dropped packed.
1248 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001249 sta->rx_packets++;
1250 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001251 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001252 }
1253
Johannes Berg9ae54c82008-01-31 19:48:20 +01001254 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001255} /* ieee80211_rx_h_sta_process */
1256
Johannes Berg571ecf62007-07-27 15:43:22 +02001257static inline struct ieee80211_fragment_entry *
1258ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1259 unsigned int frag, unsigned int seq, int rx_queue,
1260 struct sk_buff **skb)
1261{
1262 struct ieee80211_fragment_entry *entry;
1263 int idx;
1264
1265 idx = sdata->fragment_next;
1266 entry = &sdata->fragments[sdata->fragment_next++];
1267 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1268 sdata->fragment_next = 0;
1269
1270 if (!skb_queue_empty(&entry->skb_list)) {
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001271#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg571ecf62007-07-27 15:43:22 +02001272 struct ieee80211_hdr *hdr =
1273 (struct ieee80211_hdr *) entry->skb_list.next->data;
1274 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1275 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
Johannes Berg0c68ae262008-10-27 15:56:10 -07001276 "addr1=%pM addr2=%pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001277 sdata->name, idx,
Johannes Berg571ecf62007-07-27 15:43:22 +02001278 jiffies - entry->first_frag_time, entry->seq,
Johannes Berg0c68ae262008-10-27 15:56:10 -07001279 entry->last_frag, hdr->addr1, hdr->addr2);
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001280#endif
Johannes Berg571ecf62007-07-27 15:43:22 +02001281 __skb_queue_purge(&entry->skb_list);
1282 }
1283
1284 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1285 *skb = NULL;
1286 entry->first_frag_time = jiffies;
1287 entry->seq = seq;
1288 entry->rx_queue = rx_queue;
1289 entry->last_frag = frag;
1290 entry->ccmp = 0;
1291 entry->extra_len = 0;
1292
1293 return entry;
1294}
1295
1296static inline struct ieee80211_fragment_entry *
1297ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001298 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +02001299 int rx_queue, struct ieee80211_hdr *hdr)
1300{
1301 struct ieee80211_fragment_entry *entry;
1302 int i, idx;
1303
1304 idx = sdata->fragment_next;
1305 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1306 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +02001307
1308 idx--;
1309 if (idx < 0)
1310 idx = IEEE80211_FRAGMENT_MAX - 1;
1311
1312 entry = &sdata->fragments[idx];
1313 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1314 entry->rx_queue != rx_queue ||
1315 entry->last_frag + 1 != frag)
1316 continue;
1317
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001318 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001319
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001320 /*
1321 * Check ftype and addresses are equal, else check next fragment
1322 */
1323 if (((hdr->frame_control ^ f_hdr->frame_control) &
1324 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001325 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1326 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1327 continue;
1328
S.Çağlar Onurab466232008-02-14 17:36:47 +02001329 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001330 __skb_queue_purge(&entry->skb_list);
1331 continue;
1332 }
1333 return entry;
1334 }
1335
1336 return NULL;
1337}
1338
Johannes Berg49461622008-06-30 15:10:45 +02001339static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001340ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001341{
1342 struct ieee80211_hdr *hdr;
1343 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001344 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001345 unsigned int frag, seq;
1346 struct ieee80211_fragment_entry *entry;
1347 struct sk_buff *skb;
Johannes Berg554891e2010-09-24 12:38:25 +02001348 struct ieee80211_rx_status *status;
Johannes Berg571ecf62007-07-27 15:43:22 +02001349
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001350 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001351 fc = hdr->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02001352 sc = le16_to_cpu(hdr->seq_ctrl);
1353 frag = sc & IEEE80211_SCTL_FRAG;
1354
Harvey Harrison358c8d92008-07-15 18:44:13 -07001355 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001356 (rx->skb)->len < 24 ||
1357 is_multicast_ether_addr(hdr->addr1))) {
1358 /* not fragmented */
1359 goto out;
1360 }
1361 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1362
Zhu Yie3cf8b32010-03-29 17:35:07 +08001363 if (skb_linearize(rx->skb))
1364 return RX_DROP_UNUSABLE;
1365
Abhijeet Kolekar058897a2010-05-11 11:22:11 -07001366 /*
1367 * skb_linearize() might change the skb->data and
1368 * previously cached variables (in this case, hdr) need to
1369 * be refreshed with the new data.
1370 */
1371 hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001372 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1373
1374 if (frag == 0) {
1375 /* This is the first fragment of a new frame. */
1376 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001377 rx->queue, &(rx->skb));
Johannes Berg97359d12010-08-10 09:46:38 +02001378 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
Harvey Harrison358c8d92008-07-15 18:44:13 -07001379 ieee80211_has_protected(fc)) {
Jouni Malinen91902522010-06-11 10:27:33 -07001380 int queue = ieee80211_is_mgmt(fc) ?
1381 NUM_RX_DATA_QUEUES : rx->queue;
Johannes Berg571ecf62007-07-27 15:43:22 +02001382 /* Store CCMP PN so that we can verify that the next
1383 * fragment has a sequential PN value. */
1384 entry->ccmp = 1;
1385 memcpy(entry->last_pn,
Jouni Malinen91902522010-06-11 10:27:33 -07001386 rx->key->u.ccmp.rx_pn[queue],
Johannes Berg571ecf62007-07-27 15:43:22 +02001387 CCMP_PN_LEN);
1388 }
Johannes Berg9ae54c82008-01-31 19:48:20 +01001389 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001390 }
1391
1392 /* This is a fragment for a frame that should already be pending in
1393 * fragment cache. Add this fragment to the end of the pending entry.
1394 */
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001395 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001396 if (!entry) {
1397 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001398 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001399 }
1400
1401 /* Verify that MPDUs within one MSDU have sequential PN values.
1402 * (IEEE 802.11i, 8.3.3.4.5) */
1403 if (entry->ccmp) {
1404 int i;
1405 u8 pn[CCMP_PN_LEN], *rpn;
Jouni Malinen91902522010-06-11 10:27:33 -07001406 int queue;
Johannes Berg97359d12010-08-10 09:46:38 +02001407 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001408 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001409 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1410 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1411 pn[i]++;
1412 if (pn[i])
1413 break;
1414 }
Jouni Malinen91902522010-06-11 10:27:33 -07001415 queue = ieee80211_is_mgmt(fc) ?
1416 NUM_RX_DATA_QUEUES : rx->queue;
1417 rpn = rx->key->u.ccmp.rx_pn[queue];
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001418 if (memcmp(pn, rpn, CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001419 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001420 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1421 }
1422
Harvey Harrison358c8d92008-07-15 18:44:13 -07001423 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +02001424 __skb_queue_tail(&entry->skb_list, rx->skb);
1425 entry->last_frag = frag;
1426 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001427 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001428 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001429 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001430 }
1431
1432 rx->skb = __skb_dequeue(&entry->skb_list);
1433 if (skb_tailroom(rx->skb) < entry->extra_len) {
1434 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1435 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1436 GFP_ATOMIC))) {
1437 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1438 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001439 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001440 }
1441 }
1442 while ((skb = __skb_dequeue(&entry->skb_list))) {
1443 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1444 dev_kfree_skb(skb);
1445 }
1446
1447 /* Complete frame has been reassembled - process it now */
Johannes Berg554891e2010-09-24 12:38:25 +02001448 status = IEEE80211_SKB_RXCB(rx->skb);
1449 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001450
1451 out:
1452 if (rx->sta)
1453 rx->sta->rx_packets++;
1454 if (is_multicast_ether_addr(hdr->addr1))
1455 rx->local->dot11MulticastReceivedFrameCount++;
1456 else
1457 ieee80211_led_rx(rx->local);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001458 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001459}
1460
Johannes Berg49461622008-06-30 15:10:45 +02001461static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001462ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001463{
Johannes Bergaf818582009-11-06 11:35:50 +01001464 struct ieee80211_sub_if_data *sdata = rx->sdata;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001465 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
Johannes Berg554891e2010-09-24 12:38:25 +02001466 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001467
Harvey Harrison358c8d92008-07-15 18:44:13 -07001468 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
Johannes Berg554891e2010-09-24 12:38:25 +02001469 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001470 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001471
Johannes Berg05c914f2008-09-11 00:01:58 +02001472 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1473 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001474 return RX_DROP_UNUSABLE;
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +02001475
Johannes Bergaf818582009-11-06 11:35:50 +01001476 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1477 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1478 else
1479 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
Johannes Berg571ecf62007-07-27 15:43:22 +02001480
Johannes Berg9ae54c82008-01-31 19:48:20 +01001481 /* Free PS Poll skb here instead of returning RX_DROP that would
Johannes Berg571ecf62007-07-27 15:43:22 +02001482 * count as an dropped frame. */
1483 dev_kfree_skb(rx->skb);
1484
Johannes Berg9ae54c82008-01-31 19:48:20 +01001485 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001486}
1487
Johannes Berg49461622008-06-30 15:10:45 +02001488static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001489ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +02001490{
Johannes Berg6e0d1142007-07-27 15:43:22 +02001491 u8 *data = rx->skb->data;
Harvey Harrison238f74a2008-07-02 11:05:34 -07001492 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001493
Harvey Harrison238f74a2008-07-02 11:05:34 -07001494 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001495 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001496
1497 /* remove the qos control field, update frame type and meta-data */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001498 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1499 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1500 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001501 /* change frame type to non QOS */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001502 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001503
Johannes Berg9ae54c82008-01-31 19:48:20 +01001504 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001505}
1506
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001507static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001508ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001509{
Johannes Berg07346f812008-05-03 01:02:02 +02001510 if (unlikely(!rx->sta ||
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001511 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001512 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001513
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001514 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001515}
1516
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001517static int
Harvey Harrison358c8d92008-07-15 18:44:13 -07001518ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02001519{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001520 struct sk_buff *skb = rx->skb;
1521 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1522
Johannes Berg3017b802007-08-28 17:01:53 -04001523 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001524 * Pass through unencrypted frames if the hardware has
1525 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001526 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001527 if (status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001528 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001529
1530 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001531 if (unlikely(!ieee80211_has_protected(fc) &&
1532 !ieee80211_is_nullfunc(fc) &&
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001533 ieee80211_is_data(fc) &&
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001534 (rx->key || rx->sdata->drop_unencrypted)))
1535 return -EACCES;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001536
1537 return 0;
1538}
1539
1540static int
1541ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1542{
1543 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Jouni Malinene3efca02010-03-28 22:31:15 -07001544 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001545 __le16 fc = hdr->frame_control;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001546
Jouni Malinene3efca02010-03-28 22:31:15 -07001547 /*
1548 * Pass through unencrypted frames if the hardware has
1549 * decrypted them already.
1550 */
1551 if (status->flag & RX_FLAG_DECRYPTED)
1552 return 0;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001553
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001554 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
Jouni Malinend211e902010-03-28 22:29:52 -07001555 if (unlikely(!ieee80211_has_protected(fc) &&
1556 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02001557 rx->key)) {
1558 if (ieee80211_is_deauth(fc))
1559 cfg80211_send_unprot_deauth(rx->sdata->dev,
1560 rx->skb->data,
1561 rx->skb->len);
1562 else if (ieee80211_is_disassoc(fc))
1563 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1564 rx->skb->data,
1565 rx->skb->len);
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001566 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02001567 }
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001568 /* BIP does not use Protected field, so need to check MMIE */
Joe Perchesf64f9e72009-11-29 16:55:45 -08001569 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02001570 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1571 if (ieee80211_is_deauth(fc))
1572 cfg80211_send_unprot_deauth(rx->sdata->dev,
1573 rx->skb->data,
1574 rx->skb->len);
1575 else if (ieee80211_is_disassoc(fc))
1576 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1577 rx->skb->data,
1578 rx->skb->len);
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001579 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02001580 }
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001581 /*
1582 * When using MFP, Action frames are not allowed prior to
1583 * having configured keys.
1584 */
1585 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1586 ieee80211_is_robust_mgmt_frame(
1587 (struct ieee80211_hdr *) rx->skb->data)))
1588 return -EACCES;
1589 }
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001590
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001591 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001592}
1593
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001594static int
Felix Fietkau4114fa22011-04-12 19:15:22 +02001595__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
Johannes Berg571ecf62007-07-27 15:43:22 +02001596{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001597 struct ieee80211_sub_if_data *sdata = rx->sdata;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001598 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001599 bool check_port_control = false;
1600 struct ethhdr *ehdr;
1601 int ret;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001602
Felix Fietkau4114fa22011-04-12 19:15:22 +02001603 *port_control = false;
Johannes Berg9bc383d2009-11-19 11:55:19 +01001604 if (ieee80211_has_a4(hdr->frame_control) &&
1605 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001606 return -1;
Johannes Berg9bc383d2009-11-19 11:55:19 +01001607
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001608 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1609 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1610
1611 if (!sdata->u.mgd.use_4addr)
1612 return -1;
1613 else
1614 check_port_control = true;
1615 }
1616
Johannes Berg9bc383d2009-11-19 11:55:19 +01001617 if (is_multicast_ether_addr(hdr->addr1) &&
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001618 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001619 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001620
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001621 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
Felix Fietkau4114fa22011-04-12 19:15:22 +02001622 if (ret < 0)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001623 return ret;
1624
1625 ehdr = (struct ethhdr *) rx->skb->data;
Felix Fietkau4114fa22011-04-12 19:15:22 +02001626 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1627 *port_control = true;
1628 else if (check_port_control)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001629 return -1;
1630
1631 return 0;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001632}
Johannes Berg571ecf62007-07-27 15:43:22 +02001633
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001634/*
1635 * requires that rx->skb is a frame with ethernet header
1636 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001637static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001638{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301639 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001640 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1641 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1642
1643 /*
1644 * Allow EAPOL frames to us/the PAE group address regardless
1645 * of whether the frame was encrypted or not.
1646 */
Johannes Berga621fa42010-08-27 14:26:54 +03001647 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
Johannes Berg47846c92009-11-25 17:46:19 +01001648 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001649 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1650 return true;
1651
1652 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07001653 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001654 return false;
1655
1656 return true;
1657}
1658
1659/*
1660 * requires that rx->skb is a frame with ethernet header
1661 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001662static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01001663ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001664{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001665 struct ieee80211_sub_if_data *sdata = rx->sdata;
1666 struct net_device *dev = sdata->dev;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001667 struct sk_buff *skb, *xmit_skb;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001668 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1669 struct sta_info *dsta;
Johannes Berg554891e2010-09-24 12:38:25 +02001670 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001671
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001672 skb = rx->skb;
1673 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001674
Johannes Berg05c914f2008-09-11 00:01:58 +02001675 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1676 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02001677 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg554891e2010-09-24 12:38:25 +02001678 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
Johannes Berg9bc383d2009-11-19 11:55:19 +01001679 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001680 if (is_multicast_ether_addr(ehdr->h_dest)) {
1681 /*
1682 * send multicast frames both to higher layers in
1683 * local net stack and back to the wireless medium
1684 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001685 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1686 if (!xmit_skb && net_ratelimit())
Johannes Berg571ecf62007-07-27 15:43:22 +02001687 printk(KERN_DEBUG "%s: failed to clone "
1688 "multicast frame\n", dev->name);
1689 } else {
Johannes Bergabe60632009-11-25 17:46:18 +01001690 dsta = sta_info_get(sdata, skb->data);
1691 if (dsta) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001692 /*
1693 * The destination station is associated to
1694 * this AP (in this VLAN), so send the frame
1695 * directly to it and do not pass it to local
1696 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02001697 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001698 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001699 skb = NULL;
1700 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001701 }
1702 }
1703
1704 if (skb) {
Johannes Bergd1c3a372009-01-07 00:26:10 +01001705 int align __maybe_unused;
1706
Kalle Valo59d9cb02009-12-17 13:54:57 +01001707#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
Johannes Bergd1c3a372009-01-07 00:26:10 +01001708 /*
1709 * 'align' will only take the values 0 or 2 here
1710 * since all frames are required to be aligned
1711 * to 2-byte boundaries when being passed to
1712 * mac80211. That also explains the __skb_push()
1713 * below.
1714 */
matthieu castetdacb6f12009-06-04 22:16:18 +02001715 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01001716 if (align) {
1717 if (WARN_ON(skb_headroom(skb) < 3)) {
1718 dev_kfree_skb(skb);
1719 skb = NULL;
1720 } else {
1721 u8 *data = skb->data;
Zhu Yi8ce0b582009-10-28 13:13:52 -07001722 size_t len = skb_headlen(skb);
1723 skb->data -= align;
1724 memmove(skb->data, data, len);
1725 skb_set_tail_pointer(skb, len);
Johannes Bergd1c3a372009-01-07 00:26:10 +01001726 }
1727 }
1728#endif
1729
1730 if (skb) {
1731 /* deliver to local stack */
1732 skb->protocol = eth_type_trans(skb, dev);
1733 memset(skb->cb, 0, sizeof(skb->cb));
John W. Linville5548a8a2010-06-24 14:25:56 -04001734 netif_receive_skb(skb);
Johannes Bergd1c3a372009-01-07 00:26:10 +01001735 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001736 }
1737
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001738 if (xmit_skb) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001739 /* send to wireless media */
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09001740 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001741 skb_reset_network_header(xmit_skb);
1742 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001743 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001744 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001745}
1746
Johannes Berg49461622008-06-30 15:10:45 +02001747static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001748ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001749{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001750 struct net_device *dev = rx->sdata->dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001751 struct sk_buff *skb = rx->skb;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001752 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1753 __le16 fc = hdr->frame_control;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001754 struct sk_buff_head frame_list;
Johannes Berg554891e2010-09-24 12:38:25 +02001755 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001756
Harvey Harrison358c8d92008-07-15 18:44:13 -07001757 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001758 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001759
Harvey Harrison358c8d92008-07-15 18:44:13 -07001760 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001761 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001762
Johannes Berg554891e2010-09-24 12:38:25 +02001763 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001764 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001765
Zhu Yieaf85ca2009-12-01 10:18:37 +08001766 if (ieee80211_has_a4(hdr->frame_control) &&
1767 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1768 !rx->sdata->u.vlan.sta)
1769 return RX_DROP_UNUSABLE;
1770
1771 if (is_multicast_ether_addr(hdr->addr1) &&
1772 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1773 rx->sdata->u.vlan.sta) ||
1774 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1775 rx->sdata->u.mgd.use_4addr)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001776 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001777
1778 skb->dev = dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001779 __skb_queue_head_init(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001780
Zhu Yie3cf8b32010-03-29 17:35:07 +08001781 if (skb_linearize(skb))
1782 return RX_DROP_UNUSABLE;
1783
Zhu Yieaf85ca2009-12-01 10:18:37 +08001784 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1785 rx->sdata->vif.type,
Yogesh Ashok Powar8b3beca2011-05-13 11:22:31 -07001786 rx->local->hw.extra_tx_headroom, true);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001787
Zhu Yieaf85ca2009-12-01 10:18:37 +08001788 while (!skb_queue_empty(&frame_list)) {
1789 rx->skb = __skb_dequeue(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001790
Harvey Harrison358c8d92008-07-15 18:44:13 -07001791 if (!ieee80211_frame_allowed(rx, fc)) {
Zhu Yieaf85ca2009-12-01 10:18:37 +08001792 dev_kfree_skb(rx->skb);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001793 continue;
1794 }
Zhu Yieaf85ca2009-12-01 10:18:37 +08001795 dev->stats.rx_packets++;
1796 dev->stats.rx_bytes += rx->skb->len;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001797
1798 ieee80211_deliver_skb(rx);
1799 }
1800
Johannes Berg9ae54c82008-01-31 19:48:20 +01001801 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001802}
1803
Ingo Molnarbf94e172008-10-12 23:51:38 -07001804#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02001805static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001806ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1807{
1808 struct ieee80211_hdr *hdr;
1809 struct ieee80211s_hdr *mesh_hdr;
1810 unsigned int hdrlen;
1811 struct sk_buff *skb = rx->skb, *fwd_skb;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001812 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001813 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02001814 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001815
1816 hdr = (struct ieee80211_hdr *) skb->data;
1817 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1818 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1819
1820 if (!ieee80211_is_data(hdr->frame_control))
1821 return RX_CONTINUE;
1822
1823 if (!mesh_hdr->ttl)
1824 /* illegal frame */
1825 return RX_DROP_MONITOR;
1826
Javier Cardona43b7b312009-10-15 18:10:51 -07001827 if (mesh_hdr->flags & MESH_FLAGS_AE) {
YanBo79617de2008-09-22 13:30:32 +08001828 struct mesh_path *mppath;
Javier Cardona43b7b312009-10-15 18:10:51 -07001829 char *proxied_addr;
1830 char *mpp_addr;
1831
1832 if (is_multicast_ether_addr(hdr->addr1)) {
1833 mpp_addr = hdr->addr3;
1834 proxied_addr = mesh_hdr->eaddr1;
1835 } else {
1836 mpp_addr = hdr->addr4;
1837 proxied_addr = mesh_hdr->eaddr2;
1838 }
YanBo79617de2008-09-22 13:30:32 +08001839
YanBo79617de2008-09-22 13:30:32 +08001840 rcu_read_lock();
Javier Cardona43b7b312009-10-15 18:10:51 -07001841 mppath = mpp_path_lookup(proxied_addr, sdata);
YanBo79617de2008-09-22 13:30:32 +08001842 if (!mppath) {
Javier Cardona43b7b312009-10-15 18:10:51 -07001843 mpp_path_add(proxied_addr, mpp_addr, sdata);
YanBo79617de2008-09-22 13:30:32 +08001844 } else {
1845 spin_lock_bh(&mppath->state_lock);
Javier Cardona43b7b312009-10-15 18:10:51 -07001846 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1847 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
YanBo79617de2008-09-22 13:30:32 +08001848 spin_unlock_bh(&mppath->state_lock);
1849 }
1850 rcu_read_unlock();
1851 }
1852
Javier Cardona3c5772a2009-08-10 12:15:48 -07001853 /* Frame has reached destination. Don't forward */
1854 if (!is_multicast_ether_addr(hdr->addr1) &&
Johannes Berg47846c92009-11-25 17:46:19 +01001855 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001856 return RX_CONTINUE;
1857
1858 mesh_hdr->ttl--;
1859
Johannes Berg554891e2010-09-24 12:38:25 +02001860 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001861 if (!mesh_hdr->ttl)
Johannes Berg472dbc42008-09-11 00:01:49 +02001862 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001863 dropped_frames_ttl);
1864 else {
1865 struct ieee80211_hdr *fwd_hdr;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001866 struct ieee80211_tx_info *info;
1867
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001868 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1869
1870 if (!fwd_skb && net_ratelimit())
1871 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001872 sdata->name);
Milton Miller919bbad2010-12-30 02:01:03 -06001873 if (!fwd_skb)
Johannes Bergb51aff02010-12-22 10:15:07 +01001874 goto out;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001875
1876 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
Johannes Berg47846c92009-11-25 17:46:19 +01001877 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001878 info = IEEE80211_SKB_CB(fwd_skb);
1879 memset(info, 0, sizeof(*info));
1880 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
Johannes Berg5061b0c2009-07-14 00:33:34 +02001881 info->control.vif = &rx->sdata->vif;
Johannes Bergcf0277e2010-01-05 18:00:58 +01001882 skb_set_queue_mapping(skb,
1883 ieee80211_select_queue(rx->sdata, fwd_skb));
1884 ieee80211_set_qos_hdr(local, skb);
Daniel Walkerc8a61a72009-08-18 10:59:00 -07001885 if (is_multicast_ether_addr(fwd_hdr->addr1))
1886 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1887 fwded_mcast);
1888 else {
Javier Cardona3c5772a2009-08-10 12:15:48 -07001889 int err;
1890 /*
1891 * Save TA to addr1 to send TA a path error if a
1892 * suitable next hop is not found
1893 */
1894 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
Javier Cardona249b4052009-07-07 10:55:03 -07001895 ETH_ALEN);
Javier Cardona3c5772a2009-08-10 12:15:48 -07001896 err = mesh_nexthop_lookup(fwd_skb, sdata);
Javier Cardona249b4052009-07-07 10:55:03 -07001897 /* Failed to immediately resolve next hop:
1898 * fwded frame was dropped or will be added
1899 * later to the pending skb queue. */
1900 if (err)
1901 return RX_DROP_MONITOR;
Daniel Walkerc8a61a72009-08-18 10:59:00 -07001902
1903 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1904 fwded_unicast);
Javier Cardona249b4052009-07-07 10:55:03 -07001905 }
1906 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1907 fwded_frames);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001908 ieee80211_add_pending_skb(local, fwd_skb);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001909 }
1910 }
1911
Johannes Bergb51aff02010-12-22 10:15:07 +01001912 out:
Javier Cardona3c5772a2009-08-10 12:15:48 -07001913 if (is_multicast_ether_addr(hdr->addr1) ||
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001914 sdata->dev->flags & IFF_PROMISC)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001915 return RX_CONTINUE;
1916 else
1917 return RX_DROP_MONITOR;
1918}
Ingo Molnarbf94e172008-10-12 23:51:38 -07001919#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001920
1921static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001922ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001923{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001924 struct ieee80211_sub_if_data *sdata = rx->sdata;
Vivek Natarajane15276a2010-02-08 17:47:01 +05301925 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001926 struct net_device *dev = sdata->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001927 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1928 __le16 fc = hdr->frame_control;
Felix Fietkau4114fa22011-04-12 19:15:22 +02001929 bool port_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001930 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001931
Harvey Harrison358c8d92008-07-15 18:44:13 -07001932 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001933 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001934
Harvey Harrison358c8d92008-07-15 18:44:13 -07001935 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001936 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001937
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001938 /*
1939 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1940 * that a 4-addr station can be detected and moved into a separate VLAN
1941 */
1942 if (ieee80211_has_a4(hdr->frame_control) &&
1943 sdata->vif.type == NL80211_IFTYPE_AP)
1944 return RX_DROP_MONITOR;
1945
Felix Fietkau4114fa22011-04-12 19:15:22 +02001946 err = __ieee80211_data_to_8023(rx, &port_control);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001947 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001948 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001949
Harvey Harrison358c8d92008-07-15 18:44:13 -07001950 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001951 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001952
Felix Fietkau4114fa22011-04-12 19:15:22 +02001953 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1954 unlikely(port_control) && sdata->bss) {
1955 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1956 u.ap);
1957 dev = sdata->dev;
1958 rx->sdata = sdata;
1959 }
1960
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001961 rx->skb->dev = dev;
1962
1963 dev->stats.rx_packets++;
1964 dev->stats.rx_bytes += rx->skb->len;
1965
Helmut Schaa08ca9442010-11-30 12:19:34 +01001966 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
Rajkumar Manoharan8c99f692011-02-02 22:57:53 +05301967 !is_multicast_ether_addr(
1968 ((struct ethhdr *)rx->skb->data)->h_dest) &&
1969 (!local->scanning &&
1970 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
Vivek Natarajane15276a2010-02-08 17:47:01 +05301971 mod_timer(&local->dynamic_ps_timer, jiffies +
1972 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1973 }
1974
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001975 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02001976
Johannes Berg9ae54c82008-01-31 19:48:20 +01001977 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001978}
1979
Johannes Berg49461622008-06-30 15:10:45 +02001980static ieee80211_rx_result debug_noinline
Christian Lamparter24a8fda2010-12-30 17:25:29 +01001981ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
Ron Rindjunsky71364712007-12-25 17:00:36 +02001982{
1983 struct ieee80211_local *local = rx->local;
1984 struct ieee80211_hw *hw = &local->hw;
1985 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07001986 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001987 struct tid_ampdu_rx *tid_agg_rx;
1988 u16 start_seq_num;
1989 u16 tid;
1990
Harvey Harrisona7767f92008-07-02 16:30:51 -07001991 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001992 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001993
Harvey Harrisona7767f92008-07-02 16:30:51 -07001994 if (ieee80211_is_back_req(bar->frame_control)) {
Johannes Berg8ae59772010-05-30 14:52:58 +02001995 struct {
1996 __le16 control, start_seq_num;
1997 } __packed bar_data;
1998
Ron Rindjunsky71364712007-12-25 17:00:36 +02001999 if (!rx->sta)
Johannes Berga02ae752009-11-16 12:00:40 +01002000 return RX_DROP_MONITOR;
Johannes Berg8ae59772010-05-30 14:52:58 +02002001
2002 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2003 &bar_data, sizeof(bar_data)))
2004 return RX_DROP_MONITOR;
2005
Johannes Berg8ae59772010-05-30 14:52:58 +02002006 tid = le16_to_cpu(bar_data.control) >> 12;
Johannes Berga87f7362010-06-10 10:21:38 +02002007
2008 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2009 if (!tid_agg_rx)
Johannes Berga02ae752009-11-16 12:00:40 +01002010 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002011
Johannes Berg8ae59772010-05-30 14:52:58 +02002012 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002013
2014 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01002015 if (tid_agg_rx->timeout)
2016 mod_timer(&tid_agg_rx->session_timer,
2017 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02002018
Johannes Bergdd318572010-11-29 11:09:16 +01002019 spin_lock(&tid_agg_rx->reorder_lock);
Johannes Berga02ae752009-11-16 12:00:40 +01002020 /* release stored frames up to start of BAR */
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002021 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
Johannes Bergdd318572010-11-29 11:09:16 +01002022 spin_unlock(&tid_agg_rx->reorder_lock);
2023
Johannes Berga02ae752009-11-16 12:00:40 +01002024 kfree_skb(skb);
2025 return RX_QUEUED;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002026 }
2027
Johannes Berg08daeca2010-05-30 14:53:43 +02002028 /*
2029 * After this point, we only want management frames,
2030 * so we can drop all remaining control frames to
2031 * cooked monitor interfaces.
2032 */
2033 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002034}
2035
Jouni Malinenf4f727a2009-01-10 11:46:53 +02002036static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2037 struct ieee80211_mgmt *mgmt,
2038 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02002039{
2040 struct ieee80211_local *local = sdata->local;
2041 struct sk_buff *skb;
2042 struct ieee80211_mgmt *resp;
2043
Johannes Berg47846c92009-11-25 17:46:19 +01002044 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
Jouni Malinenfea14732009-01-08 13:32:06 +02002045 /* Not to own unicast address */
2046 return;
2047 }
2048
Johannes Berg46900292009-02-15 12:44:28 +01002049 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2050 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
Johannes Berg77fdaa12009-07-07 03:45:17 +02002051 /* Not from the current AP or not associated yet. */
Jouni Malinenfea14732009-01-08 13:32:06 +02002052 return;
2053 }
2054
2055 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2056 /* Too short SA Query request frame */
2057 return;
2058 }
2059
2060 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2061 if (skb == NULL)
2062 return;
2063
2064 skb_reserve(skb, local->hw.extra_tx_headroom);
2065 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2066 memset(resp, 0, 24);
2067 memcpy(resp->da, mgmt->sa, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01002068 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01002069 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02002070 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2071 IEEE80211_STYPE_ACTION);
2072 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2073 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2074 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2075 memcpy(resp->u.action.u.sa_query.trans_id,
2076 mgmt->u.action.u.sa_query.trans_id,
2077 WLAN_SA_QUERY_TR_ID_LEN);
2078
Johannes Berg62ae67b2009-11-18 18:42:05 +01002079 ieee80211_tx_skb(sdata, skb);
Jouni Malinenfea14732009-01-08 13:32:06 +02002080}
2081
Johannes Berg49461622008-06-30 15:10:45 +02002082static ieee80211_rx_result debug_noinline
Johannes Berg2e161f72010-08-12 15:38:38 +02002083ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2084{
2085 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002086 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002087
2088 /*
2089 * From here on, look only at management frames.
2090 * Data and control frames are already handled,
2091 * and unknown (reserved) frames are useless.
2092 */
2093 if (rx->skb->len < 24)
2094 return RX_DROP_MONITOR;
2095
2096 if (!ieee80211_is_mgmt(mgmt->frame_control))
2097 return RX_DROP_MONITOR;
2098
Johannes Berg554891e2010-09-24 12:38:25 +02002099 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg2e161f72010-08-12 15:38:38 +02002100 return RX_DROP_MONITOR;
2101
2102 if (ieee80211_drop_unencrypted_mgmt(rx))
2103 return RX_DROP_UNUSABLE;
2104
2105 return RX_CONTINUE;
2106}
2107
2108static ieee80211_rx_result debug_noinline
Johannes Bergde1ede72008-09-09 14:42:50 +02002109ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2110{
2111 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002112 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergde1ede72008-09-09 14:42:50 +02002113 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002114 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergde1ede72008-09-09 14:42:50 +02002115 int len = rx->skb->len;
2116
2117 if (!ieee80211_is_action(mgmt->frame_control))
2118 return RX_CONTINUE;
2119
Jouni Malinen026331c2010-02-15 12:53:10 +02002120 /* drop too small frames */
2121 if (len < IEEE80211_MIN_ACTION_SIZE)
2122 return RX_DROP_UNUSABLE;
2123
2124 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
Johannes Berg84040802010-02-15 12:46:39 +02002125 return RX_DROP_UNUSABLE;
Johannes Bergde1ede72008-09-09 14:42:50 +02002126
Johannes Berg554891e2010-09-24 12:38:25 +02002127 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg84040802010-02-15 12:46:39 +02002128 return RX_DROP_UNUSABLE;
Johannes Bergde1ede72008-09-09 14:42:50 +02002129
Johannes Bergde1ede72008-09-09 14:42:50 +02002130 switch (mgmt->u.action.category) {
2131 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01002132 /*
2133 * The aggregation code is not prepared to handle
2134 * anything but STA/AP due to the BSSID handling;
2135 * IBSS could work in the code but isn't supported
2136 * by drivers or the standard.
2137 */
2138 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2139 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2140 sdata->vif.type != NL80211_IFTYPE_AP)
Johannes Berg84040802010-02-15 12:46:39 +02002141 break;
Johannes Berg8abd3f92009-02-10 21:25:47 +01002142
Jouni Malinen026331c2010-02-15 12:53:10 +02002143 /* verify action_code is present */
2144 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2145 break;
2146
Johannes Bergde1ede72008-09-09 14:42:50 +02002147 switch (mgmt->u.action.u.addba_req.action_code) {
2148 case WLAN_ACTION_ADDBA_REQ:
2149 if (len < (IEEE80211_MIN_ACTION_SIZE +
2150 sizeof(mgmt->u.action.u.addba_req)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002151 goto invalid;
2152 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002153 case WLAN_ACTION_ADDBA_RESP:
2154 if (len < (IEEE80211_MIN_ACTION_SIZE +
2155 sizeof(mgmt->u.action.u.addba_resp)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002156 goto invalid;
2157 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002158 case WLAN_ACTION_DELBA:
2159 if (len < (IEEE80211_MIN_ACTION_SIZE +
2160 sizeof(mgmt->u.action.u.delba)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002161 goto invalid;
2162 break;
2163 default:
2164 goto invalid;
Johannes Bergde1ede72008-09-09 14:42:50 +02002165 }
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002166
Johannes Berg8b58ff82010-06-10 10:21:51 +02002167 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002168 case WLAN_CATEGORY_SPECTRUM_MGMT:
2169 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
Johannes Berg84040802010-02-15 12:46:39 +02002170 break;
Johannes Berg46900292009-02-15 12:44:28 +01002171
2172 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002173 break;
Johannes Berg46900292009-02-15 12:44:28 +01002174
Jouni Malinen026331c2010-02-15 12:53:10 +02002175 /* verify action_code is present */
2176 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2177 break;
2178
Johannes Berg39192c02008-09-09 14:49:03 +02002179 switch (mgmt->u.action.u.measurement.action_code) {
2180 case WLAN_ACTION_SPCT_MSR_REQ:
2181 if (len < (IEEE80211_MIN_ACTION_SIZE +
2182 sizeof(mgmt->u.action.u.measurement)))
Johannes Berg84040802010-02-15 12:46:39 +02002183 break;
Johannes Berg39192c02008-09-09 14:49:03 +02002184 ieee80211_process_measurement_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002185 goto handled;
Sujithc481ec92009-01-06 09:28:37 +05302186 case WLAN_ACTION_SPCT_CHL_SWITCH:
2187 if (len < (IEEE80211_MIN_ACTION_SIZE +
2188 sizeof(mgmt->u.action.u.chan_switch)))
Johannes Berg84040802010-02-15 12:46:39 +02002189 break;
Sujithc481ec92009-01-06 09:28:37 +05302190
Johannes Bergcc32abd2009-05-15 11:52:31 +02002191 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002192 break;
Johannes Bergcc32abd2009-05-15 11:52:31 +02002193
Johannes Berg46900292009-02-15 12:44:28 +01002194 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
Johannes Berg84040802010-02-15 12:46:39 +02002195 break;
Sujithc481ec92009-01-06 09:28:37 +05302196
Johannes Berg8b58ff82010-06-10 10:21:51 +02002197 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002198 }
2199 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002200 case WLAN_CATEGORY_SA_QUERY:
2201 if (len < (IEEE80211_MIN_ACTION_SIZE +
2202 sizeof(mgmt->u.action.u.sa_query)))
Johannes Berg84040802010-02-15 12:46:39 +02002203 break;
2204
Jouni Malinenfea14732009-01-08 13:32:06 +02002205 switch (mgmt->u.action.u.sa_query.action) {
2206 case WLAN_ACTION_SA_QUERY_REQUEST:
2207 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002208 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002209 ieee80211_process_sa_query_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002210 goto handled;
Jouni Malinenfea14732009-01-08 13:32:06 +02002211 }
2212 break;
Javier Cardonad3aaec8a2011-05-03 16:57:09 -07002213 case WLAN_CATEGORY_MESH_ACTION:
Johannes Berg77a121c2010-06-10 10:21:34 +02002214 if (!ieee80211_vif_is_mesh(&sdata->vif))
2215 break;
Johannes Berg8b58ff82010-06-10 10:21:51 +02002216 goto queue;
Javier Cardonac7108a72010-12-16 17:37:50 -08002217 case WLAN_CATEGORY_MESH_PATH_SEL:
2218 if (!mesh_path_sel_is_hwmp(sdata))
2219 break;
2220 goto queue;
Johannes Berg84040802010-02-15 12:46:39 +02002221 }
Jouni Malinen026331c2010-02-15 12:53:10 +02002222
Johannes Berg2e161f72010-08-12 15:38:38 +02002223 return RX_CONTINUE;
2224
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002225 invalid:
Johannes Berg554891e2010-09-24 12:38:25 +02002226 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
Johannes Berg2e161f72010-08-12 15:38:38 +02002227 /* will return in the next handlers */
2228 return RX_CONTINUE;
2229
2230 handled:
2231 if (rx->sta)
2232 rx->sta->rx_packets++;
2233 dev_kfree_skb(rx->skb);
2234 return RX_QUEUED;
2235
2236 queue:
2237 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2238 skb_queue_tail(&sdata->skb_queue, rx->skb);
2239 ieee80211_queue_work(&local->hw, &sdata->work);
2240 if (rx->sta)
2241 rx->sta->rx_packets++;
2242 return RX_QUEUED;
2243}
2244
2245static ieee80211_rx_result debug_noinline
2246ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2247{
Johannes Berg554891e2010-09-24 12:38:25 +02002248 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002249
2250 /* skip known-bad action frames and return them in the next handler */
Johannes Berg554891e2010-09-24 12:38:25 +02002251 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
Johannes Berg2e161f72010-08-12 15:38:38 +02002252 return RX_CONTINUE;
Felix Fietkaud7907442010-01-07 20:23:53 +01002253
Jouni Malinen026331c2010-02-15 12:53:10 +02002254 /*
2255 * Getting here means the kernel doesn't know how to handle
2256 * it, but maybe userspace does ... include returned frames
2257 * so userspace can register for those to know whether ones
2258 * it transmitted were processed or returned.
2259 */
Jouni Malinen026331c2010-02-15 12:53:10 +02002260
Johannes Berg2e161f72010-08-12 15:38:38 +02002261 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2262 rx->skb->data, rx->skb->len,
2263 GFP_ATOMIC)) {
2264 if (rx->sta)
2265 rx->sta->rx_packets++;
2266 dev_kfree_skb(rx->skb);
2267 return RX_QUEUED;
2268 }
2269
2270
2271 return RX_CONTINUE;
2272}
2273
2274static ieee80211_rx_result debug_noinline
2275ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2276{
2277 struct ieee80211_local *local = rx->local;
2278 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2279 struct sk_buff *nskb;
2280 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02002281 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002282
2283 if (!ieee80211_is_action(mgmt->frame_control))
2284 return RX_CONTINUE;
2285
2286 /*
2287 * For AP mode, hostapd is responsible for handling any action
2288 * frames that we didn't handle, including returning unknown
2289 * ones. For all other modes we will return them to the sender,
2290 * setting the 0x80 bit in the action category, as required by
2291 * 802.11-2007 7.3.1.11.
2292 * Newer versions of hostapd shall also use the management frame
2293 * registration mechanisms, but older ones still use cooked
2294 * monitor interfaces so push all frames there.
2295 */
Johannes Berg554891e2010-09-24 12:38:25 +02002296 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
Johannes Berg2e161f72010-08-12 15:38:38 +02002297 (sdata->vif.type == NL80211_IFTYPE_AP ||
2298 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2299 return RX_DROP_MONITOR;
Jouni Malinen026331c2010-02-15 12:53:10 +02002300
Johannes Berg84040802010-02-15 12:46:39 +02002301 /* do not return rejected action frames */
2302 if (mgmt->u.action.category & 0x80)
2303 return RX_DROP_UNUSABLE;
2304
2305 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2306 GFP_ATOMIC);
2307 if (nskb) {
John W. Linville292b4df2010-06-24 11:13:56 -04002308 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
Johannes Berg84040802010-02-15 12:46:39 +02002309
John W. Linville292b4df2010-06-24 11:13:56 -04002310 nmgmt->u.action.category |= 0x80;
2311 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2312 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
Johannes Berg84040802010-02-15 12:46:39 +02002313
2314 memset(nskb->cb, 0, sizeof(nskb->cb));
2315
2316 ieee80211_tx_skb(rx->sdata, nskb);
Johannes Bergde1ede72008-09-09 14:42:50 +02002317 }
Johannes Berg39192c02008-09-09 14:49:03 +02002318 dev_kfree_skb(rx->skb);
2319 return RX_QUEUED;
Johannes Bergde1ede72008-09-09 14:42:50 +02002320}
2321
2322static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002323ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02002324{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002325 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergaf6b6372009-12-23 13:15:35 +01002326 ieee80211_rx_result rxs;
Johannes Berg77a121c2010-06-10 10:21:34 +02002327 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2328 __le16 stype;
Johannes Berg571ecf62007-07-27 15:43:22 +02002329
Johannes Bergaf6b6372009-12-23 13:15:35 +01002330 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2331 if (rxs != RX_CONTINUE)
2332 return rxs;
2333
Johannes Berg77a121c2010-06-10 10:21:34 +02002334 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
Johannes Berg472dbc42008-09-11 00:01:49 +02002335
Johannes Berg77a121c2010-06-10 10:21:34 +02002336 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2337 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2338 sdata->vif.type != NL80211_IFTYPE_STATION)
2339 return RX_DROP_MONITOR;
Johannes Bergf9d540e2007-09-28 14:02:09 +02002340
Johannes Berg77a121c2010-06-10 10:21:34 +02002341 switch (stype) {
2342 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2343 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2344 /* process for all: mesh, mlme, ibss */
2345 break;
2346 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2347 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
Christian Lamparter2c313332010-11-29 20:53:23 +01002348 if (is_multicast_ether_addr(mgmt->da) &&
2349 !is_broadcast_ether_addr(mgmt->da))
2350 return RX_DROP_MONITOR;
2351
Johannes Berg77a121c2010-06-10 10:21:34 +02002352 /* process only for station */
2353 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2354 return RX_DROP_MONITOR;
2355 break;
2356 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2357 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2358 /* process only for ibss */
2359 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2360 return RX_DROP_MONITOR;
2361 break;
2362 default:
2363 return RX_DROP_MONITOR;
2364 }
Johannes Berg46900292009-02-15 12:44:28 +01002365
Johannes Berg77a121c2010-06-10 10:21:34 +02002366 /* queue up frame and kick off work to process it */
Johannes Bergc1475ca2010-06-10 10:21:37 +02002367 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg77a121c2010-06-10 10:21:34 +02002368 skb_queue_tail(&sdata->skb_queue, rx->skb);
2369 ieee80211_queue_work(&rx->local->hw, &sdata->work);
Johannes Berg8b58ff82010-06-10 10:21:51 +02002370 if (rx->sta)
2371 rx->sta->rx_packets++;
Johannes Berg77a121c2010-06-10 10:21:34 +02002372
2373 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002374}
2375
Johannes Berg5cf121c2008-02-25 16:27:43 +01002376/* TODO: use IEEE80211_RX_FRAGMENTED */
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002377static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2378 struct ieee80211_rate *rate)
Michael Wu3d30d942008-01-31 19:48:27 +01002379{
2380 struct ieee80211_sub_if_data *sdata;
2381 struct ieee80211_local *local = rx->local;
2382 struct ieee80211_rtap_hdr {
2383 struct ieee80211_radiotap_header hdr;
2384 u8 flags;
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002385 u8 rate_or_pad;
Michael Wu3d30d942008-01-31 19:48:27 +01002386 __le16 chan_freq;
2387 __le16 chan_flags;
Eric Dumazetbc105022010-06-03 03:21:52 -07002388 } __packed *rthdr;
Michael Wu3d30d942008-01-31 19:48:27 +01002389 struct sk_buff *skb = rx->skb, *skb2;
2390 struct net_device *prev_dev = NULL;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002391 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Michael Wu3d30d942008-01-31 19:48:27 +01002392
Johannes Berg554891e2010-09-24 12:38:25 +02002393 /*
2394 * If cooked monitor has been processed already, then
2395 * don't do it again. If not, set the flag.
2396 */
2397 if (rx->flags & IEEE80211_RX_CMNTR)
John W. Linville7c1e1832010-09-24 15:52:49 -04002398 goto out_free_skb;
Johannes Berg554891e2010-09-24 12:38:25 +02002399 rx->flags |= IEEE80211_RX_CMNTR;
John W. Linville7c1e1832010-09-24 15:52:49 -04002400
Michael Wu3d30d942008-01-31 19:48:27 +01002401 if (skb_headroom(skb) < sizeof(*rthdr) &&
2402 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2403 goto out_free_skb;
2404
2405 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2406 memset(rthdr, 0, sizeof(*rthdr));
2407 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2408 rthdr->hdr.it_present =
2409 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
Michael Wu3d30d942008-01-31 19:48:27 +01002410 (1 << IEEE80211_RADIOTAP_CHANNEL));
2411
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002412 if (rate) {
2413 rthdr->rate_or_pad = rate->bitrate / 5;
2414 rthdr->hdr.it_present |=
2415 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2416 }
Michael Wu3d30d942008-01-31 19:48:27 +01002417 rthdr->chan_freq = cpu_to_le16(status->freq);
2418
2419 if (status->band == IEEE80211_BAND_5GHZ)
2420 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2421 IEEE80211_CHAN_5GHZ);
2422 else
2423 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2424 IEEE80211_CHAN_2GHZ);
2425
2426 skb_set_mac_header(skb, 0);
2427 skb->ip_summed = CHECKSUM_UNNECESSARY;
2428 skb->pkt_type = PACKET_OTHERHOST;
2429 skb->protocol = htons(ETH_P_802_2);
2430
2431 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01002432 if (!ieee80211_sdata_running(sdata))
Michael Wu3d30d942008-01-31 19:48:27 +01002433 continue;
2434
Johannes Berg05c914f2008-09-11 00:01:58 +02002435 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Michael Wu3d30d942008-01-31 19:48:27 +01002436 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2437 continue;
2438
2439 if (prev_dev) {
2440 skb2 = skb_clone(skb, GFP_ATOMIC);
2441 if (skb2) {
2442 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04002443 netif_receive_skb(skb2);
Michael Wu3d30d942008-01-31 19:48:27 +01002444 }
2445 }
2446
2447 prev_dev = sdata->dev;
2448 sdata->dev->stats.rx_packets++;
2449 sdata->dev->stats.rx_bytes += skb->len;
2450 }
2451
2452 if (prev_dev) {
2453 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04002454 netif_receive_skb(skb);
Johannes Berg554891e2010-09-24 12:38:25 +02002455 return;
2456 }
Michael Wu3d30d942008-01-31 19:48:27 +01002457
2458 out_free_skb:
2459 dev_kfree_skb(skb);
2460}
2461
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002462static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2463 ieee80211_rx_result res)
2464{
2465 switch (res) {
2466 case RX_DROP_MONITOR:
2467 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2468 if (rx->sta)
2469 rx->sta->rx_dropped++;
2470 /* fall through */
2471 case RX_CONTINUE: {
2472 struct ieee80211_rate *rate = NULL;
2473 struct ieee80211_supported_band *sband;
2474 struct ieee80211_rx_status *status;
2475
2476 status = IEEE80211_SKB_RXCB((rx->skb));
2477
2478 sband = rx->local->hw.wiphy->bands[status->band];
2479 if (!(status->flag & RX_FLAG_HT))
2480 rate = &sband->bitrates[status->rate_idx];
2481
2482 ieee80211_rx_cooked_monitor(rx, rate);
2483 break;
2484 }
2485 case RX_DROP_UNUSABLE:
2486 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2487 if (rx->sta)
2488 rx->sta->rx_dropped++;
2489 dev_kfree_skb(rx->skb);
2490 break;
2491 case RX_QUEUED:
2492 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2493 break;
2494 }
2495}
2496
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002497static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002498{
2499 ieee80211_rx_result res = RX_DROP_MONITOR;
2500 struct sk_buff *skb;
2501
2502#define CALL_RXH(rxh) \
2503 do { \
2504 res = rxh(rx); \
2505 if (res != RX_CONTINUE) \
2506 goto rxh_next; \
2507 } while (0);
2508
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002509 spin_lock(&rx->local->rx_skb_queue.lock);
2510 if (rx->local->running_rx_handler)
2511 goto unlock;
2512
2513 rx->local->running_rx_handler = true;
2514
2515 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2516 spin_unlock(&rx->local->rx_skb_queue.lock);
2517
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002518 /*
2519 * all the other fields are valid across frames
2520 * that belong to an aMPDU since they are on the
2521 * same TID from the same station
2522 */
2523 rx->skb = skb;
2524
2525 CALL_RXH(ieee80211_rx_h_decrypt)
2526 CALL_RXH(ieee80211_rx_h_check_more_data)
2527 CALL_RXH(ieee80211_rx_h_sta_process)
2528 CALL_RXH(ieee80211_rx_h_defragment)
2529 CALL_RXH(ieee80211_rx_h_ps_poll)
2530 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2531 /* must be after MMIC verify so header is counted in MPDU mic */
2532 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2533 CALL_RXH(ieee80211_rx_h_amsdu)
2534#ifdef CONFIG_MAC80211_MESH
2535 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2536 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2537#endif
2538 CALL_RXH(ieee80211_rx_h_data)
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002539 CALL_RXH(ieee80211_rx_h_ctrl);
Johannes Berg2e161f72010-08-12 15:38:38 +02002540 CALL_RXH(ieee80211_rx_h_mgmt_check)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002541 CALL_RXH(ieee80211_rx_h_action)
Johannes Berg2e161f72010-08-12 15:38:38 +02002542 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2543 CALL_RXH(ieee80211_rx_h_action_return)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002544 CALL_RXH(ieee80211_rx_h_mgmt)
2545
2546 rxh_next:
2547 ieee80211_rx_handlers_result(rx, res);
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002548 spin_lock(&rx->local->rx_skb_queue.lock);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002549#undef CALL_RXH
2550 }
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002551
2552 rx->local->running_rx_handler = false;
2553
2554 unlock:
2555 spin_unlock(&rx->local->rx_skb_queue.lock);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002556}
Johannes Berg571ecf62007-07-27 15:43:22 +02002557
Johannes Berg4406c372010-09-24 11:21:06 +02002558static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
Johannes Berg58905292008-01-31 19:48:25 +01002559{
Johannes Berg58905292008-01-31 19:48:25 +01002560 ieee80211_rx_result res = RX_DROP_MONITOR;
2561
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002562#define CALL_RXH(rxh) \
2563 do { \
2564 res = rxh(rx); \
2565 if (res != RX_CONTINUE) \
Johannes Berg2569a822009-11-25 17:46:17 +01002566 goto rxh_next; \
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002567 } while (0);
Johannes Berg58905292008-01-31 19:48:25 +01002568
Johannes Berg49461622008-06-30 15:10:45 +02002569 CALL_RXH(ieee80211_rx_h_passive_scan)
2570 CALL_RXH(ieee80211_rx_h_check)
Johannes Berg2569a822009-11-25 17:46:17 +01002571
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002572 ieee80211_rx_reorder_ampdu(rx);
Johannes Berg2569a822009-11-25 17:46:17 +01002573
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002574 ieee80211_rx_handlers(rx);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002575 return;
Johannes Berg49461622008-06-30 15:10:45 +02002576
Johannes Berg2569a822009-11-25 17:46:17 +01002577 rxh_next:
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002578 ieee80211_rx_handlers_result(rx, res);
2579
2580#undef CALL_RXH
Johannes Berg58905292008-01-31 19:48:25 +01002581}
2582
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002583/*
Johannes Bergdd318572010-11-29 11:09:16 +01002584 * This function makes calls into the RX path, therefore
2585 * it has to be invoked under RCU read lock.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002586 */
2587void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2588{
Johannes Berg554891e2010-09-24 12:38:25 +02002589 struct ieee80211_rx_data rx = {
2590 .sta = sta,
2591 .sdata = sta->sdata,
2592 .local = sta->local,
2593 .queue = tid,
Helmut Schaafcf8bd32011-04-01 15:46:05 +02002594 .flags = 0,
Johannes Berg554891e2010-09-24 12:38:25 +02002595 };
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02002596 struct tid_ampdu_rx *tid_agg_rx;
2597
2598 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2599 if (!tid_agg_rx)
2600 return;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002601
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02002602 spin_lock(&tid_agg_rx->reorder_lock);
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002603 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02002604 spin_unlock(&tid_agg_rx->reorder_lock);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002605
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002606 ieee80211_rx_handlers(&rx);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002607}
2608
Johannes Berg571ecf62007-07-27 15:43:22 +02002609/* main receive path */
2610
Johannes Berg20b01f82010-09-24 11:21:05 +02002611static int prepare_for_handlers(struct ieee80211_rx_data *rx,
Johannes Berg23a24de2007-07-27 15:43:22 +02002612 struct ieee80211_hdr *hdr)
2613{
Johannes Berg20b01f82010-09-24 11:21:05 +02002614 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002615 struct sk_buff *skb = rx->skb;
2616 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2617 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02002618 int multicast = is_multicast_ether_addr(hdr->addr1);
2619
Johannes Berg51fb61e2007-12-19 01:31:27 +01002620 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02002621 case NL80211_IFTYPE_STATION:
Johannes Berg9bc383d2009-11-19 11:55:19 +01002622 if (!bssid && !sdata->u.mgd.use_4addr)
Johannes Berg23a24de2007-07-27 15:43:22 +02002623 return 0;
Johannes Berg77fdaa12009-07-07 03:45:17 +02002624 if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002625 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
Felix Fietkau4f312332011-02-05 23:48:37 +01002626 if (!(sdata->dev->flags & IFF_PROMISC) ||
2627 sdata->u.mgd.use_4addr)
Johannes Berg23a24de2007-07-27 15:43:22 +02002628 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02002629 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002630 }
2631 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002632 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02002633 if (!bssid)
2634 return 0;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002635 if (ieee80211_is_beacon(hdr->frame_control)) {
Bruno Randolf9d9bf772008-02-18 11:21:36 +09002636 return 1;
Vladimir Koutny87291c02008-06-13 16:50:44 +02002637 }
Johannes Berg46900292009-02-15 12:44:28 +01002638 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
Johannes Berg554891e2010-09-24 12:38:25 +02002639 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002640 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02002641 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002642 } else if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002643 compare_ether_addr(sdata->vif.addr,
Johannes Berg23a24de2007-07-27 15:43:22 +02002644 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002645 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002646 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02002647 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002648 } else if (!rx->sta) {
2649 int rate_idx;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002650 if (status->flag & RX_FLAG_HT)
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002651 rate_idx = 0; /* TODO: HT rates */
2652 else
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002653 rate_idx = status->rate_idx;
Johannes Berg34e89502010-02-03 13:59:58 +01002654 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2655 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002656 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002657 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002658 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg6032f932008-02-23 15:17:07 +01002659 if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002660 compare_ether_addr(sdata->vif.addr,
Johannes Berg6032f932008-02-23 15:17:07 +01002661 hdr->addr1) != 0) {
2662 if (!(sdata->dev->flags & IFF_PROMISC))
2663 return 0;
2664
Johannes Berg554891e2010-09-24 12:38:25 +02002665 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg6032f932008-02-23 15:17:07 +01002666 }
2667 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002668 case NL80211_IFTYPE_AP_VLAN:
2669 case NL80211_IFTYPE_AP:
Johannes Berg23a24de2007-07-27 15:43:22 +02002670 if (!bssid) {
Johannes Berg47846c92009-11-25 17:46:19 +01002671 if (compare_ether_addr(sdata->vif.addr,
Johannes Berg23a24de2007-07-27 15:43:22 +02002672 hdr->addr1))
2673 return 0;
2674 } else if (!ieee80211_bssid_match(bssid,
Johannes Berg47846c92009-11-25 17:46:19 +01002675 sdata->vif.addr)) {
Arik Nemtsov771bbd02011-02-01 13:23:05 +02002676 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2677 !ieee80211_is_beacon(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02002678 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02002679 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002680 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002681 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002682 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07002683 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02002684 return 0;
2685 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2686 return 0;
2687 break;
Johannes Berg2ca27bc2010-09-16 14:58:23 +02002688 default:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02002689 /* should never get here */
2690 WARN_ON(1);
2691 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02002692 }
2693
2694 return 1;
2695}
2696
Johannes Berg571ecf62007-07-27 15:43:22 +02002697/*
Johannes Berg4406c372010-09-24 11:21:06 +02002698 * This function returns whether or not the SKB
2699 * was destined for RX processing or not, which,
2700 * if consume is true, is equivalent to whether
2701 * or not the skb was consumed.
2702 */
2703static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2704 struct sk_buff *skb, bool consume)
2705{
2706 struct ieee80211_local *local = rx->local;
2707 struct ieee80211_sub_if_data *sdata = rx->sdata;
2708 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2709 struct ieee80211_hdr *hdr = (void *)skb->data;
2710 int prepares;
2711
2712 rx->skb = skb;
Johannes Berg554891e2010-09-24 12:38:25 +02002713 status->rx_flags |= IEEE80211_RX_RA_MATCH;
Johannes Berg4406c372010-09-24 11:21:06 +02002714 prepares = prepare_for_handlers(rx, hdr);
2715
2716 if (!prepares)
2717 return false;
2718
Johannes Berg4406c372010-09-24 11:21:06 +02002719 if (!consume) {
2720 skb = skb_copy(skb, GFP_ATOMIC);
2721 if (!skb) {
2722 if (net_ratelimit())
2723 wiphy_debug(local->hw.wiphy,
Ben Greearb305dae2011-01-08 10:30:54 -08002724 "failed to copy skb for %s\n",
Johannes Berg4406c372010-09-24 11:21:06 +02002725 sdata->name);
2726 return true;
2727 }
2728
2729 rx->skb = skb;
2730 }
2731
2732 ieee80211_invoke_rx_handlers(rx);
2733 return true;
2734}
2735
2736/*
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002737 * This is the actual Rx frames handler. as it blongs to Rx path it must
2738 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02002739 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002740static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
Christian Lamparter071d9ac2010-08-05 01:36:36 +02002741 struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02002742{
Johannes Berg554891e2010-09-24 12:38:25 +02002743 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002744 struct ieee80211_local *local = hw_to_local(hw);
2745 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002746 struct ieee80211_hdr *hdr;
Zhu Yie3cf8b32010-03-29 17:35:07 +08002747 __le16 fc;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002748 struct ieee80211_rx_data rx;
Johannes Berg4406c372010-09-24 11:21:06 +02002749 struct ieee80211_sub_if_data *prev;
Ben Greear56af3262010-09-23 10:22:24 -07002750 struct sta_info *sta, *tmp, *prev_sta;
Zhu Yie3cf8b32010-03-29 17:35:07 +08002751 int err = 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02002752
Zhu Yie3cf8b32010-03-29 17:35:07 +08002753 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02002754 memset(&rx, 0, sizeof(rx));
2755 rx.skb = skb;
2756 rx.local = local;
Johannes Berg72abd812007-09-17 01:29:22 -04002757
Zhu Yie3cf8b32010-03-29 17:35:07 +08002758 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
Johannes Berg571ecf62007-07-27 15:43:22 +02002759 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02002760
Helmut Schaa142b9f52009-07-23 13:18:01 +02002761 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
Ben Greearb23b0252011-02-04 11:54:17 -08002762 test_bit(SCAN_SW_SCANNING, &local->scanning)))
Johannes Berg554891e2010-09-24 12:38:25 +02002763 status->rx_flags |= IEEE80211_RX_IN_SCAN;
Johannes Berg571ecf62007-07-27 15:43:22 +02002764
Zhu Yie3cf8b32010-03-29 17:35:07 +08002765 if (ieee80211_is_mgmt(fc))
2766 err = skb_linearize(skb);
2767 else
2768 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2769
2770 if (err) {
2771 dev_kfree_skb(skb);
2772 return;
2773 }
2774
2775 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg38f37142008-01-29 17:07:43 +01002776 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01002777 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01002778
Zhu Yie3cf8b32010-03-29 17:35:07 +08002779 if (ieee80211_is_data(fc)) {
Ben Greear56af3262010-09-23 10:22:24 -07002780 prev_sta = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02002781
Johannes Bergabe60632009-11-25 17:46:18 +01002782 for_each_sta_info(local, hdr->addr2, sta, tmp) {
Ben Greear56af3262010-09-23 10:22:24 -07002783 if (!prev_sta) {
2784 prev_sta = sta;
2785 continue;
2786 }
2787
2788 rx.sta = prev_sta;
2789 rx.sdata = prev_sta->sdata;
Johannes Berg4406c372010-09-24 11:21:06 +02002790 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Johannes Berg571ecf62007-07-27 15:43:22 +02002791
Ben Greear56af3262010-09-23 10:22:24 -07002792 prev_sta = sta;
Johannes Berg4406c372010-09-24 11:21:06 +02002793 }
Ben Greear56af3262010-09-23 10:22:24 -07002794
2795 if (prev_sta) {
2796 rx.sta = prev_sta;
2797 rx.sdata = prev_sta->sdata;
2798
Johannes Berg4406c372010-09-24 11:21:06 +02002799 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
Ben Greear56af3262010-09-23 10:22:24 -07002800 return;
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05302801 goto out;
Ben Greear56af3262010-09-23 10:22:24 -07002802 }
Johannes Berg4406c372010-09-24 11:21:06 +02002803 }
2804
Johannes Berg4b0dd982010-09-24 11:21:07 +02002805 prev = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02002806
Johannes Berg4b0dd982010-09-24 11:21:07 +02002807 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2808 if (!ieee80211_sdata_running(sdata))
2809 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01002810
Johannes Berg4b0dd982010-09-24 11:21:07 +02002811 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2812 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2813 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01002814
Johannes Berg4b0dd982010-09-24 11:21:07 +02002815 /*
2816 * frame is destined for this interface, but if it's
2817 * not also for the previous one we handle that after
2818 * the loop to avoid copying the SKB once too much
2819 */
Johannes Bergb2e77712007-09-26 15:19:39 +02002820
Johannes Berg4b0dd982010-09-24 11:21:07 +02002821 if (!prev) {
Johannes Berg340e11f2007-07-27 15:43:22 +02002822 prev = sdata;
Johannes Berg4b0dd982010-09-24 11:21:07 +02002823 continue;
Johannes Berg8e6f00322007-07-27 15:43:22 +02002824 }
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002825
Johannes Berg4b0dd982010-09-24 11:21:07 +02002826 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2827 rx.sdata = prev;
2828 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002829
Johannes Berg4b0dd982010-09-24 11:21:07 +02002830 prev = sdata;
2831 }
Johannes Berg4406c372010-09-24 11:21:06 +02002832
Johannes Berg4b0dd982010-09-24 11:21:07 +02002833 if (prev) {
2834 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2835 rx.sdata = prev;
2836
2837 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2838 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002839 }
Johannes Berg4406c372010-09-24 11:21:06 +02002840
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05302841 out:
Johannes Berg4406c372010-09-24 11:21:06 +02002842 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002843}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002844
2845/*
2846 * This is the receive path handler. It is called by a low level driver when an
2847 * 802.11 MPDU is received from the hardware.
2848 */
John W. Linville103bf9f2009-08-20 16:34:15 -04002849void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002850{
2851 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01002852 struct ieee80211_rate *rate = NULL;
2853 struct ieee80211_supported_band *sband;
Johannes Bergf1d58c22009-06-17 13:13:00 +02002854 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg8318d782008-01-24 19:38:38 +01002855
Johannes Bergd20ef632009-10-11 15:10:40 +02002856 WARN_ON_ONCE(softirq_count() == 0);
2857
Johannes Berg77a980d2009-08-24 11:46:30 +02002858 if (WARN_ON(status->band < 0 ||
2859 status->band >= IEEE80211_NUM_BANDS))
2860 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01002861
2862 sband = local->hw.wiphy->bands[status->band];
Johannes Berg77a980d2009-08-24 11:46:30 +02002863 if (WARN_ON(!sband))
2864 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01002865
Johannes Berg89c3a8a2009-07-28 18:10:17 +02002866 /*
2867 * If we're suspending, it is possible although not too likely
2868 * that we'd be receiving frames after having already partially
2869 * quiesced the stack. We can't process such frames then since
2870 * that might, for example, cause stations to be added or other
2871 * driver callbacks be invoked.
2872 */
Johannes Berg77a980d2009-08-24 11:46:30 +02002873 if (unlikely(local->quiescing || local->suspended))
2874 goto drop;
Johannes Berg89c3a8a2009-07-28 18:10:17 +02002875
Johannes Bergea77f122009-08-21 14:44:45 +02002876 /*
2877 * The same happens when we're not even started,
2878 * but that's worth a warning.
2879 */
Johannes Berg77a980d2009-08-24 11:46:30 +02002880 if (WARN_ON(!local->started))
2881 goto drop;
Johannes Bergea77f122009-08-21 14:44:45 +02002882
Johannes Bergfc885182010-07-30 13:23:12 +02002883 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05002884 /*
Johannes Bergfc885182010-07-30 13:23:12 +02002885 * Validate the rate, unless a PLCP error means that
2886 * we probably can't have a valid rate here anyway.
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05002887 */
Johannes Bergfc885182010-07-30 13:23:12 +02002888
2889 if (status->flag & RX_FLAG_HT) {
2890 /*
2891 * rate_idx is MCS index, which can be [0-76]
2892 * as documented on:
2893 *
2894 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2895 *
2896 * Anything else would be some sort of driver or
2897 * hardware error. The driver should catch hardware
2898 * errors.
2899 */
2900 if (WARN((status->rate_idx < 0 ||
2901 status->rate_idx > 76),
2902 "Rate marked as an HT rate but passed "
2903 "status->rate_idx is not "
2904 "an MCS index [0-76]: %d (0x%02x)\n",
2905 status->rate_idx,
2906 status->rate_idx))
2907 goto drop;
2908 } else {
2909 if (WARN_ON(status->rate_idx < 0 ||
2910 status->rate_idx >= sband->n_bitrates))
2911 goto drop;
2912 rate = &sband->bitrates[status->rate_idx];
2913 }
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002914 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002915
Johannes Berg554891e2010-09-24 12:38:25 +02002916 status->rx_flags = 0;
2917
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002918 /*
2919 * key references and virtual interfaces are protected using RCU
2920 * and this requires that we are in a read-side RCU section during
2921 * receive processing
2922 */
2923 rcu_read_lock();
2924
2925 /*
2926 * Frames with failed FCS/PLCP checksum are not returned,
2927 * all other frames are returned without radiotap header
2928 * if it was previously present.
2929 * Also, frames with less than 16 bytes are dropped.
2930 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002931 skb = ieee80211_rx_monitor(local, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002932 if (!skb) {
2933 rcu_read_unlock();
2934 return;
2935 }
2936
Johannes Berge1e54062010-11-30 08:58:45 +01002937 ieee80211_tpt_led_trig_rx(local,
2938 ((struct ieee80211_hdr *)skb->data)->frame_control,
2939 skb->len);
Christian Lamparter071d9ac2010-08-05 01:36:36 +02002940 __ieee80211_rx_handle_packet(hw, skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002941
2942 rcu_read_unlock();
Johannes Berg77a980d2009-08-24 11:46:30 +02002943
2944 return;
2945 drop:
2946 kfree_skb(skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002947}
John W. Linville103bf9f2009-08-20 16:34:15 -04002948EXPORT_SYMBOL(ieee80211_rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02002949
2950/* This is a version of the rx handler that can be called from hard irq
2951 * context. Post the skb on the queue and schedule the tasklet */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002952void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02002953{
2954 struct ieee80211_local *local = hw_to_local(hw);
2955
2956 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2957
Johannes Berg571ecf62007-07-27 15:43:22 +02002958 skb->pkt_type = IEEE80211_RX_MSG;
2959 skb_queue_tail(&local->skb_queue, skb);
2960 tasklet_schedule(&local->tasklet);
2961}
2962EXPORT_SYMBOL(ieee80211_rx_irqsafe);