blob: b37c3415f0ea20df88189881df55802027e9172d [file] [log] [blame]
Johannes Berg571ecf62007-07-27 15:43:22 +02001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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
80 if (status->flag & RX_FLAG_TSFT)
81 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 */
126 if (status->flag & RX_FLAG_TSFT) {
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 /*
145 * TODO: add following information into radiotap header once
146 * suitable fields are defined for it:
147 * - MCS index (status->rate_idx)
148 * - HT40 (status->flag & RX_FLAG_40MHZ)
149 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
150 */
151 *pos = 0;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200152 } else {
Jouni Malinenebe6c7b2009-01-10 11:47:33 +0200153 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200154 *pos = rate->bitrate / 5;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200155 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200156 pos++;
157
158 /* IEEE80211_RADIOTAP_CHANNEL */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100159 put_unaligned_le16(status->freq, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200160 pos += 2;
161 if (status->band == IEEE80211_BAND_5GHZ)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100162 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
163 pos);
Johannes Berg5f0b7de2009-11-16 13:58:21 +0100164 else if (status->flag & RX_FLAG_HT)
165 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
166 pos);
Bruno Randolf9deb1ae2008-07-30 17:20:06 +0200167 else if (rate->flags & IEEE80211_RATE_ERP_G)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100168 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
169 pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200170 else
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100171 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
172 pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200173 pos += 2;
174
175 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
176 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
177 *pos = status->signal;
178 rthdr->it_present |=
179 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
180 pos++;
181 }
182
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200183 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
184
185 /* IEEE80211_RADIOTAP_ANTENNA */
186 *pos = status->antenna;
187 pos++;
188
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200189 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
190
191 /* IEEE80211_RADIOTAP_RX_FLAGS */
192 /* ensure 2 byte alignment for the 2 byte field as required */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100193 if ((pos - (u8 *)rthdr) & 1)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200194 pos++;
Johannes Bergaae89832009-03-13 12:52:10 +0100195 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100196 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
197 put_unaligned_le16(rx_flags, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200198 pos += 2;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100199
200 if (status->flag & RX_FLAG_HT) {
201 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
202 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
203 IEEE80211_RADIOTAP_MCS_HAVE_GI |
204 IEEE80211_RADIOTAP_MCS_HAVE_BW;
205 *pos = 0;
206 if (status->flag & RX_FLAG_SHORT_GI)
207 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
208 if (status->flag & RX_FLAG_40MHZ)
209 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
210 pos++;
211 *pos++ = status->rate_idx;
212 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200213}
214
Johannes Bergb2e77712007-09-26 15:19:39 +0200215/*
216 * This function copies a received frame to all monitor interfaces and
217 * returns a cleaned-up SKB that no longer includes the FCS nor the
218 * radiotap header the driver might have added.
219 */
220static struct sk_buff *
221ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
Johannes Berg8318d782008-01-24 19:38:38 +0100222 struct ieee80211_rate *rate)
Johannes Bergb2e77712007-09-26 15:19:39 +0200223{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200224 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200225 struct ieee80211_sub_if_data *sdata;
Johannes Bergb2e77712007-09-26 15:19:39 +0200226 int needed_headroom = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200227 struct sk_buff *skb, *skb2;
228 struct net_device *prev_dev = NULL;
229 int present_fcs_len = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200230
231 /*
232 * First, we may need to make a copy of the skb because
233 * (1) we need to modify it for radiotap (if not present), and
234 * (2) the other RX handlers will modify the skb we got.
235 *
236 * We don't need to, of course, if we aren't going to return
237 * the SKB because it has a bad FCS/PLCP checksum.
238 */
Johannes Berg0869aea2009-10-28 10:03:35 +0100239
240 /* room for the radiotap header based on driver features */
241 needed_headroom = ieee80211_rx_radiotap_len(local, status);
Johannes Bergb2e77712007-09-26 15:19:39 +0200242
243 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
244 present_fcs_len = FCS_LEN;
245
Zhu Yie3cf8b32010-03-29 17:35:07 +0800246 /* make sure hdr->frame_control is on the linear part */
247 if (!pskb_may_pull(origskb, 2)) {
248 dev_kfree_skb(origskb);
249 return NULL;
250 }
251
Johannes Bergb2e77712007-09-26 15:19:39 +0200252 if (!local->monitors) {
Johannes Berg0869aea2009-10-28 10:03:35 +0100253 if (should_drop_frame(origskb, present_fcs_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200254 dev_kfree_skb(origskb);
255 return NULL;
256 }
257
Johannes Berg0869aea2009-10-28 10:03:35 +0100258 return remove_monitor_info(local, origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200259 }
260
Johannes Berg0869aea2009-10-28 10:03:35 +0100261 if (should_drop_frame(origskb, present_fcs_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200262 /* only need to expand headroom if necessary */
263 skb = origskb;
264 origskb = NULL;
265
266 /*
267 * This shouldn't trigger often because most devices have an
268 * RX header they pull before we get here, and that should
269 * be big enough for our radiotap information. We should
270 * probably export the length to drivers so that we can have
271 * them allocate enough headroom to start with.
272 */
273 if (skb_headroom(skb) < needed_headroom &&
Johannes Bergc49e5ea2007-12-11 21:33:42 +0100274 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200275 dev_kfree_skb(skb);
276 return NULL;
277 }
278 } else {
279 /*
280 * Need to make a copy and possibly remove radiotap header
281 * and FCS from the original.
282 */
283 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
284
Johannes Berg0869aea2009-10-28 10:03:35 +0100285 origskb = remove_monitor_info(local, origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200286
287 if (!skb)
288 return origskb;
289 }
290
Johannes Berg0869aea2009-10-28 10:03:35 +0100291 /* prepend radiotap information */
292 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
Johannes Bergb2e77712007-09-26 15:19:39 +0200293
Johannes Bergce3edf6d02007-12-19 01:31:22 +0100294 skb_reset_mac_header(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200295 skb->ip_summed = CHECKSUM_UNNECESSARY;
296 skb->pkt_type = PACKET_OTHERHOST;
297 skb->protocol = htons(ETH_P_802_2);
298
299 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200300 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +0200301 continue;
302
Michael Wu3d30d942008-01-31 19:48:27 +0100303 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
304 continue;
305
Johannes Berg9607e6b2009-12-23 13:15:31 +0100306 if (!ieee80211_sdata_running(sdata))
Johannes Berg47846c92009-11-25 17:46:19 +0100307 continue;
308
Johannes Bergb2e77712007-09-26 15:19:39 +0200309 if (prev_dev) {
310 skb2 = skb_clone(skb, GFP_ATOMIC);
311 if (skb2) {
312 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400313 netif_receive_skb(skb2);
Johannes Bergb2e77712007-09-26 15:19:39 +0200314 }
315 }
316
317 prev_dev = sdata->dev;
318 sdata->dev->stats.rx_packets++;
319 sdata->dev->stats.rx_bytes += skb->len;
320 }
321
322 if (prev_dev) {
323 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400324 netif_receive_skb(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200325 } else
326 dev_kfree_skb(skb);
327
328 return origskb;
329}
330
331
Johannes Berg5cf121c2008-02-25 16:27:43 +0100332static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200333{
Harvey Harrison238f74a2008-07-02 11:05:34 -0700334 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +0200335 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200336 int tid;
337
338 /* does the frame have a qos control field? */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700339 if (ieee80211_is_data_qos(hdr->frame_control)) {
340 u8 *qc = ieee80211_get_qos_ctl(hdr);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200341 /* frame has qos control */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700342 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
343 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
Johannes Berg554891e2010-09-24 12:38:25 +0200344 status->rx_flags |= IEEE80211_RX_AMSDU;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200345 } else {
Johannes Berg1411f9b2008-07-10 10:11:02 +0200346 /*
347 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
348 *
349 * Sequence numbers for management frames, QoS data
350 * frames with a broadcast/multicast address in the
351 * Address 1 field, and all non-QoS data frames sent
352 * by QoS STAs are assigned using an additional single
353 * modulo-4096 counter, [...]
354 *
355 * We also use that counter for non-QoS STAs.
356 */
357 tid = NUM_RX_DATA_QUEUES - 1;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200358 }
Johannes Berg52865df2007-07-27 15:43:22 +0200359
Johannes Berg5cf121c2008-02-25 16:27:43 +0100360 rx->queue = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200361 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
362 * For now, set skb->priority to 0 for other cases. */
363 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100364}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200365
Johannes Bergd1c3a372009-01-07 00:26:10 +0100366/**
367 * DOC: Packet alignment
368 *
369 * Drivers always need to pass packets that are aligned to two-byte boundaries
370 * to the stack.
371 *
372 * Additionally, should, if possible, align the payload data in a way that
373 * guarantees that the contained IP header is aligned to a four-byte
374 * boundary. In the case of regular frames, this simply means aligning the
375 * payload to a four-byte boundary (because either the IP header is directly
376 * contained, or IV/RFC1042 headers that have a length divisible by four are
Kalle Valo59d9cb02009-12-17 13:54:57 +0100377 * in front of it). If the payload data is not properly aligned and the
378 * architecture doesn't support efficient unaligned operations, mac80211
379 * will align the data.
Johannes Bergd1c3a372009-01-07 00:26:10 +0100380 *
381 * With A-MSDU frames, however, the payload data address must yield two modulo
382 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
383 * push the IP header further back to a multiple of four again. Thankfully, the
384 * specs were sane enough this time around to require padding each A-MSDU
385 * subframe to a length that is a multiple of four.
386 *
387 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
388 * the payload is not supported, the driver is required to move the 802.11
389 * header to be directly in front of the payload in that case.
390 */
391static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
Johannes Berg38f37142008-01-29 17:07:43 +0100392{
Kalle Valo59d9cb02009-12-17 13:54:57 +0100393#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
394 WARN_ONCE((unsigned long)rx->skb->data & 1,
395 "unaligned packet at 0x%p\n", rx->skb->data);
Johannes Bergd1c3a372009-01-07 00:26:10 +0100396#endif
Johannes Berg6e0d1142007-07-27 15:43:22 +0200397}
398
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +0200399
Johannes Berg571ecf62007-07-27 15:43:22 +0200400/* rx handlers */
401
Johannes Berg49461622008-06-30 15:10:45 +0200402static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100403ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200404{
405 struct ieee80211_local *local = rx->local;
Johannes Berg554891e2010-09-24 12:38:25 +0200406 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200407 struct sk_buff *skb = rx->skb;
408
Johannes Berg554891e2010-09-24 12:38:25 +0200409 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN)))
Johannes Berg4080c7c2010-09-24 11:21:08 +0200410 return RX_CONTINUE;
411
412 if (test_bit(SCAN_HW_SCANNING, &local->scanning))
Johannes Bergf1d58c22009-06-17 13:13:00 +0200413 return ieee80211_scan_rx(rx->sdata, skb);
Zhu Yiece8edd2007-11-22 10:53:21 +0800414
Johannes Berg4080c7c2010-09-24 11:21:08 +0200415 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) {
Zhu Yiece8edd2007-11-22 10:53:21 +0800416 /* drop all the other packets during a software scan anyway */
Johannes Bergf1d58c22009-06-17 13:13:00 +0200417 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
Zhu Yiece8edd2007-11-22 10:53:21 +0800418 dev_kfree_skb(skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100419 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200420 }
421
Johannes Berg4080c7c2010-09-24 11:21:08 +0200422 /* scanning finished during invoking of handlers */
423 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
424 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200425}
426
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200427
428static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
429{
430 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
431
432 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
433 return 0;
434
435 return ieee80211_is_robust_mgmt_frame(hdr);
436}
437
438
439static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
440{
441 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
442
443 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
444 return 0;
445
446 return ieee80211_is_robust_mgmt_frame(hdr);
447}
448
449
450/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
451static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
452{
453 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
454 struct ieee80211_mmie *mmie;
455
456 if (skb->len < 24 + sizeof(*mmie) ||
457 !is_multicast_ether_addr(hdr->da))
458 return -1;
459
460 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
461 return -1; /* not a robust management frame */
462
463 mmie = (struct ieee80211_mmie *)
464 (skb->data + skb->len - sizeof(*mmie));
465 if (mmie->element_id != WLAN_EID_MMIE ||
466 mmie->length != sizeof(*mmie) - 2)
467 return -1;
468
469 return le16_to_cpu(mmie->key_id);
470}
471
472
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100473static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100474ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100475{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700476 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
477 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg47846c92009-11-25 17:46:19 +0100478 char *dev_addr = rx->sdata->vif.addr;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100479
Harvey Harrisona7767f92008-07-02 16:30:51 -0700480 if (ieee80211_is_data(hdr->frame_control)) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700481 if (is_multicast_ether_addr(hdr->addr1)) {
482 if (ieee80211_has_tods(hdr->frame_control) ||
483 !ieee80211_has_fromds(hdr->frame_control))
484 return RX_DROP_MONITOR;
485 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
486 return RX_DROP_MONITOR;
487 } else {
488 if (!ieee80211_has_a4(hdr->frame_control))
489 return RX_DROP_MONITOR;
490 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
491 return RX_DROP_MONITOR;
492 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100493 }
494
495 /* If there is not an established peer link and this is not a peer link
496 * establisment frame, beacon or probe, drop the frame.
497 */
498
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800499 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100500 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100501
Harvey Harrisona7767f92008-07-02 16:30:51 -0700502 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100503 return RX_DROP_MONITOR;
504
Harvey Harrisona7767f92008-07-02 16:30:51 -0700505 if (ieee80211_is_action(hdr->frame_control)) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100506 mgmt = (struct ieee80211_mgmt *)hdr;
Javier Cardona97ad9132010-03-29 11:00:21 -0700507 if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100508 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100509 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100510 }
511
Harvey Harrisona7767f92008-07-02 16:30:51 -0700512 if (ieee80211_is_probe_req(hdr->frame_control) ||
513 ieee80211_is_probe_resp(hdr->frame_control) ||
514 ieee80211_is_beacon(hdr->frame_control))
515 return RX_CONTINUE;
516
517 return RX_DROP_MONITOR;
518
519 }
520
521#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
522
523 if (ieee80211_is_data(hdr->frame_control) &&
524 is_multicast_ether_addr(hdr->addr1) &&
Javier Cardona3c5772a2009-08-10 12:15:48 -0700525 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100526 return RX_DROP_MONITOR;
Johannes Berg902acc72008-02-23 15:17:19 +0100527#undef msh_h_get
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100528
Johannes Berg902acc72008-02-23 15:17:19 +0100529 return RX_CONTINUE;
530}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100531
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100532#define SEQ_MODULO 0x1000
533#define SEQ_MASK 0xfff
534
535static inline int seq_less(u16 sq1, u16 sq2)
536{
537 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
538}
539
540static inline u16 seq_inc(u16 sq)
541{
542 return (sq + 1) & SEQ_MASK;
543}
544
545static inline u16 seq_sub(u16 sq1, u16 sq2)
546{
547 return (sq1 - sq2) & SEQ_MASK;
548}
549
550
551static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
552 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100553 int index)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100554{
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100555 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100556 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
Christian Lamparter4cfda472010-12-27 23:21:26 +0100557 struct ieee80211_rx_status *status;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100558
Johannes Bergdd318572010-11-29 11:09:16 +0100559 lockdep_assert_held(&tid_agg_rx->reorder_lock);
560
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100561 if (!skb)
562 goto no_frame;
563
Christian Lamparter071d9ac2010-08-05 01:36:36 +0200564 /* release the frame from the reorder ring buffer */
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100565 tid_agg_rx->stored_mpdu_num--;
566 tid_agg_rx->reorder_buf[index] = NULL;
Christian Lamparter4cfda472010-12-27 23:21:26 +0100567 status = IEEE80211_SKB_RXCB(skb);
568 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100569 skb_queue_tail(&local->rx_skb_queue, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100570
571no_frame:
572 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
573}
574
575static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
576 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100577 u16 head_seq_num)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100578{
579 int index;
580
Johannes Bergdd318572010-11-29 11:09:16 +0100581 lockdep_assert_held(&tid_agg_rx->reorder_lock);
582
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100583 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
584 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
585 tid_agg_rx->buf_size;
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100586 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100587 }
588}
589
590/*
591 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
592 * the skb was added to the buffer longer than this time ago, the earlier
593 * frames that have not yet been received are assumed to be lost and the skb
594 * can be released for processing. This may also release other skb's from the
595 * reorder buffer if there are no additional gaps between the frames.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200596 *
597 * Callers must hold tid_agg_rx->reorder_lock.
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100598 */
599#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
600
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200601static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100602 struct tid_ampdu_rx *tid_agg_rx)
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200603{
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200604 int index, j;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200605
Johannes Bergdd318572010-11-29 11:09:16 +0100606 lockdep_assert_held(&tid_agg_rx->reorder_lock);
607
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200608 /* release the buffer until next missing frame */
609 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
610 tid_agg_rx->buf_size;
611 if (!tid_agg_rx->reorder_buf[index] &&
612 tid_agg_rx->stored_mpdu_num > 1) {
613 /*
614 * No buffers ready to be released, but check whether any
615 * frames in the reorder buffer have timed out.
616 */
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200617 int skipped = 1;
618 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
619 j = (j + 1) % tid_agg_rx->buf_size) {
620 if (!tid_agg_rx->reorder_buf[j]) {
621 skipped++;
622 continue;
623 }
624 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
625 HT_RX_REORDER_BUF_TIMEOUT))
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200626 goto set_release_timer;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200627
628#ifdef CONFIG_MAC80211_HT_DEBUG
629 if (net_ratelimit())
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700630 wiphy_debug(hw->wiphy,
631 "release an RX reorder frame due to timeout on earlier frames\n");
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200632#endif
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100633 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200634
635 /*
636 * Increment the head seq# also for the skipped slots.
637 */
638 tid_agg_rx->head_seq_num =
639 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
640 skipped = 0;
641 }
642 } else while (tid_agg_rx->reorder_buf[index]) {
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100643 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200644 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
645 tid_agg_rx->buf_size;
646 }
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200647
648 if (tid_agg_rx->stored_mpdu_num) {
649 j = index = seq_sub(tid_agg_rx->head_seq_num,
650 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
651
652 for (; j != (index - 1) % tid_agg_rx->buf_size;
653 j = (j + 1) % tid_agg_rx->buf_size) {
654 if (tid_agg_rx->reorder_buf[j])
655 break;
656 }
657
658 set_release_timer:
659
660 mod_timer(&tid_agg_rx->reorder_timer,
661 tid_agg_rx->reorder_time[j] +
662 HT_RX_REORDER_BUF_TIMEOUT);
663 } else {
664 del_timer(&tid_agg_rx->reorder_timer);
665 }
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200666}
667
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100668/*
669 * As this function belongs to the RX path it must be under
670 * rcu_read_lock protection. It returns false if the frame
671 * can be processed immediately, true if it was consumed.
672 */
673static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
674 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100675 struct sk_buff *skb)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100676{
677 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
678 u16 sc = le16_to_cpu(hdr->seq_ctrl);
679 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
680 u16 head_seq_num, buf_size;
681 int index;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200682 bool ret = true;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100683
Johannes Bergdd318572010-11-29 11:09:16 +0100684 spin_lock(&tid_agg_rx->reorder_lock);
685
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100686 buf_size = tid_agg_rx->buf_size;
687 head_seq_num = tid_agg_rx->head_seq_num;
688
689 /* frame with out of date sequence number */
690 if (seq_less(mpdu_seq_num, head_seq_num)) {
691 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200692 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100693 }
694
695 /*
696 * If frame the sequence number exceeds our buffering window
697 * size release some previous frames to make room for this one.
698 */
699 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
700 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
701 /* release stored frames up to new head to stack */
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100702 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100703 }
704
705 /* Now the new frame is always in the range of the reordering buffer */
706
707 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
708
709 /* check if we already stored this frame */
710 if (tid_agg_rx->reorder_buf[index]) {
711 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200712 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100713 }
714
715 /*
716 * If the current MPDU is in the right order and nothing else
717 * is stored we can process it directly, no need to buffer it.
718 */
719 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
720 tid_agg_rx->stored_mpdu_num == 0) {
721 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200722 ret = false;
723 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100724 }
725
726 /* put the frame in the reordering buffer */
727 tid_agg_rx->reorder_buf[index] = skb;
728 tid_agg_rx->reorder_time[index] = jiffies;
729 tid_agg_rx->stored_mpdu_num++;
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100730 ieee80211_sta_reorder_release(hw, tid_agg_rx);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100731
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200732 out:
733 spin_unlock(&tid_agg_rx->reorder_lock);
734 return ret;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100735}
736
737/*
738 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
739 * true if the MPDU was buffered, false if it should be processed.
740 */
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100741static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100742{
Johannes Berg2569a822009-11-25 17:46:17 +0100743 struct sk_buff *skb = rx->skb;
744 struct ieee80211_local *local = rx->local;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100745 struct ieee80211_hw *hw = &local->hw;
746 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Johannes Berg2569a822009-11-25 17:46:17 +0100747 struct sta_info *sta = rx->sta;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100748 struct tid_ampdu_rx *tid_agg_rx;
749 u16 sc;
750 int tid;
751
752 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg2569a822009-11-25 17:46:17 +0100753 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100754
755 /*
756 * filter the QoS data rx stream according to
757 * STA/TID and check if this STA/TID is on aggregation
758 */
759
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100760 if (!sta)
Johannes Berg2569a822009-11-25 17:46:17 +0100761 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100762
763 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
764
Johannes Berga87f7362010-06-10 10:21:38 +0200765 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
766 if (!tid_agg_rx)
767 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100768
769 /* qos null data frames are excluded */
770 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Johannes Berga87f7362010-06-10 10:21:38 +0200771 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100772
773 /* new, potentially un-ordered, ampdu frame - process it */
774
775 /* reset session timer */
776 if (tid_agg_rx->timeout)
777 mod_timer(&tid_agg_rx->session_timer,
778 TU_TO_EXP_TIME(tid_agg_rx->timeout));
779
780 /* if this mpdu is fragmented - terminate rx aggregation session */
781 sc = le16_to_cpu(hdr->seq_ctrl);
782 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Bergc1475ca2010-06-10 10:21:37 +0200783 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg344eec62010-06-10 10:21:36 +0200784 skb_queue_tail(&rx->sdata->skb_queue, skb);
785 ieee80211_queue_work(&local->hw, &rx->sdata->work);
Johannes Berg2569a822009-11-25 17:46:17 +0100786 return;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100787 }
788
Johannes Berga87f7362010-06-10 10:21:38 +0200789 /*
790 * No locking needed -- we will only ever process one
791 * RX packet at a time, and thus own tid_agg_rx. All
792 * other code manipulating it needs to (and does) make
793 * sure that we cannot get to it any more before doing
794 * anything with it.
795 */
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100796 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
Johannes Berg2569a822009-11-25 17:46:17 +0100797 return;
798
799 dont_reorder:
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100800 skb_queue_tail(&local->rx_skb_queue, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100801}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100802
Johannes Berg49461622008-06-30 15:10:45 +0200803static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100804ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200805{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700806 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +0200807 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200808
809 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
810 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700811 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100812 rx->sta->last_seq_ctrl[rx->queue] ==
Johannes Berg571ecf62007-07-27 15:43:22 +0200813 hdr->seq_ctrl)) {
Johannes Berg554891e2010-09-24 12:38:25 +0200814 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200815 rx->local->dot11FrameDuplicateCount++;
816 rx->sta->num_duplicates++;
817 }
Johannes Berge4c26ad2008-01-31 19:48:21 +0100818 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200819 } else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100820 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +0200821 }
822
Johannes Berg571ecf62007-07-27 15:43:22 +0200823 if (unlikely(rx->skb->len < 16)) {
824 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100825 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200826 }
827
Johannes Berg571ecf62007-07-27 15:43:22 +0200828 /* Drop disallowed frame classes based on STA auth/assoc state;
829 * IEEE 802.11, Chap 5.5.
830 *
Johannes Bergccd7b362008-09-11 00:01:56 +0200831 * mac80211 filters only based on association state, i.e. it drops
832 * Class 3 frames from not associated stations. hostapd sends
Johannes Berg571ecf62007-07-27 15:43:22 +0200833 * deauth/disassoc frames when needed. In addition, hostapd is
834 * responsible for filtering on both auth and assoc states.
835 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100836
Johannes Berg902acc72008-02-23 15:17:19 +0100837 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100838 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100839
Harvey Harrisona7767f92008-07-02 16:30:51 -0700840 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
841 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200842 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Bill Jordan1be7fe82010-10-01 11:20:41 -0400843 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
Johannes Berg07346f812008-05-03 01:02:02 +0200844 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700845 if ((!ieee80211_has_fromds(hdr->frame_control) &&
846 !ieee80211_has_tods(hdr->frame_control) &&
847 ieee80211_is_data(hdr->frame_control)) ||
Johannes Berg554891e2010-09-24 12:38:25 +0200848 !(status->rx_flags & IEEE80211_RX_RA_MATCH)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200849 /* Drop IBSS frames and frames for other hosts
850 * silently. */
Johannes Berge4c26ad2008-01-31 19:48:21 +0100851 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200852 }
853
Johannes Berge4c26ad2008-01-31 19:48:21 +0100854 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200855 }
856
Johannes Berg9ae54c82008-01-31 19:48:20 +0100857 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +0200858}
859
860
Johannes Berg49461622008-06-30 15:10:45 +0200861static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100862ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
Johannes Berg570bd532007-07-27 15:43:22 +0200863{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100864 struct sk_buff *skb = rx->skb;
865 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
866 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg3017b802007-08-28 17:01:53 -0400867 int keyidx;
868 int hdrlen;
Johannes Berge4c26ad2008-01-31 19:48:21 +0100869 ieee80211_rx_result result = RX_DROP_UNUSABLE;
Johannes Berge31b8212010-10-05 19:39:30 +0200870 struct ieee80211_key *sta_ptk = NULL;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200871 int mmie_keyidx = -1;
Johannes Berg761ab472010-05-28 14:24:19 +0200872 __le16 fc;
Johannes Berg570bd532007-07-27 15:43:22 +0200873
Johannes Berg3017b802007-08-28 17:01:53 -0400874 /*
875 * Key selection 101
876 *
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200877 * There are four types of keys:
Johannes Berg3017b802007-08-28 17:01:53 -0400878 * - GTK (group keys)
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200879 * - IGTK (group keys for management frames)
Johannes Berg3017b802007-08-28 17:01:53 -0400880 * - PTK (pairwise keys)
881 * - STK (station-to-station pairwise keys)
882 *
883 * When selecting a key, we have to distinguish between multicast
884 * (including broadcast) and unicast frames, the latter can only
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200885 * use PTKs and STKs while the former always use GTKs and IGTKs.
886 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
887 * unicast frames can also use key indices like GTKs. Hence, if we
888 * don't have a PTK/STK we check the key index for a WEP key.
Johannes Berg3017b802007-08-28 17:01:53 -0400889 *
Johannes Berg8dc06a12007-08-28 17:01:55 -0400890 * Note that in a regular BSS, multicast frames are sent by the
891 * AP only, associated stations unicast the frame to the AP first
892 * which then multicasts it on their behalf.
893 *
Johannes Berg3017b802007-08-28 17:01:53 -0400894 * There is also a slight problem in IBSS mode: GTKs are negotiated
895 * with each station, that is something we don't currently handle.
Johannes Berg8dc06a12007-08-28 17:01:55 -0400896 * The spec seems to expect that one negotiates the same key with
897 * every station but there's no such requirement; VLANs could be
898 * possible.
Johannes Berg3017b802007-08-28 17:01:53 -0400899 */
Johannes Berg571ecf62007-07-27 15:43:22 +0200900
Johannes Berg3017b802007-08-28 17:01:53 -0400901 /*
Johannes Berg1990af82007-09-26 17:53:15 +0200902 * No point in finding a key and decrypting if the frame is neither
Johannes Berg3017b802007-08-28 17:01:53 -0400903 * addressed to us nor a multicast frame.
904 */
Johannes Berg554891e2010-09-24 12:38:25 +0200905 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100906 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -0400907
Johannes Berg2569a822009-11-25 17:46:17 +0100908 /* start without a key */
909 rx->key = NULL;
910
Johannes Bergd4e46a32007-09-14 11:10:24 -0400911 if (rx->sta)
Johannes Berge31b8212010-10-05 19:39:30 +0200912 sta_ptk = rcu_dereference(rx->sta->ptk);
Johannes Bergd4e46a32007-09-14 11:10:24 -0400913
Johannes Berg761ab472010-05-28 14:24:19 +0200914 fc = hdr->frame_control;
915
916 if (!ieee80211_has_protected(fc))
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300917 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
918
Johannes Berge31b8212010-10-05 19:39:30 +0200919 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
920 rx->key = sta_ptk;
Johannes Bergdc1580d2010-08-10 09:46:40 +0200921 if ((status->flag & RX_FLAG_DECRYPTED) &&
922 (status->flag & RX_FLAG_IV_STRIPPED))
923 return RX_CONTINUE;
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300924 /* Skip decryption if the frame is not protected. */
Johannes Berg761ab472010-05-28 14:24:19 +0200925 if (!ieee80211_has_protected(fc))
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300926 return RX_CONTINUE;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200927 } else if (mmie_keyidx >= 0) {
928 /* Broadcast/multicast robust management frame / BIP */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100929 if ((status->flag & RX_FLAG_DECRYPTED) &&
930 (status->flag & RX_FLAG_IV_STRIPPED))
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200931 return RX_CONTINUE;
932
933 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
934 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
935 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
Johannes Berge31b8212010-10-05 19:39:30 +0200936 if (rx->sta)
937 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
938 if (!rx->key)
939 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
Johannes Berg761ab472010-05-28 14:24:19 +0200940 } else if (!ieee80211_has_protected(fc)) {
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300941 /*
942 * The frame was not protected, so skip decryption. However, we
943 * need to set rx->key if there is a key that could have been
944 * used so that the frame may be dropped if encryption would
945 * have been expected.
946 */
947 struct ieee80211_key *key = NULL;
Johannes Berg897bed82010-12-09 19:49:00 +0100948 struct ieee80211_sub_if_data *sdata = rx->sdata;
949 int i;
950
Johannes Berg761ab472010-05-28 14:24:19 +0200951 if (ieee80211_is_mgmt(fc) &&
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300952 is_multicast_ether_addr(hdr->addr1) &&
953 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
954 rx->key = key;
Johannes Berg897bed82010-12-09 19:49:00 +0100955 else {
956 if (rx->sta) {
957 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
958 key = rcu_dereference(rx->sta->gtk[i]);
959 if (key)
960 break;
961 }
962 }
963 if (!key) {
964 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
965 key = rcu_dereference(sdata->keys[i]);
966 if (key)
967 break;
968 }
969 }
970 if (key)
971 rx->key = key;
972 }
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300973 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200974 } else {
Zhu Yi39184b12010-04-08 15:35:10 +0800975 u8 keyid;
Johannes Berg3017b802007-08-28 17:01:53 -0400976 /*
977 * The device doesn't give us the IV so we won't be
978 * able to look up the key. That's ok though, we
979 * don't need to decrypt the frame, we just won't
980 * be able to keep statistics accurate.
981 * Except for key threshold notifications, should
982 * we somehow allow the driver to tell us which key
983 * the hardware used if this flag is set?
984 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100985 if ((status->flag & RX_FLAG_DECRYPTED) &&
986 (status->flag & RX_FLAG_IV_STRIPPED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100987 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200988
Johannes Berg761ab472010-05-28 14:24:19 +0200989 hdrlen = ieee80211_hdrlen(fc);
Johannes Berg571ecf62007-07-27 15:43:22 +0200990
Johannes Berg3017b802007-08-28 17:01:53 -0400991 if (rx->skb->len < 8 + hdrlen)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100992 return RX_DROP_UNUSABLE; /* TODO: count this? */
Johannes Berg571ecf62007-07-27 15:43:22 +0200993
Johannes Berg3017b802007-08-28 17:01:53 -0400994 /*
995 * no need to call ieee80211_wep_get_keyidx,
996 * it verifies a bunch of things we've done already
997 */
Zhu Yi39184b12010-04-08 15:35:10 +0800998 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
999 keyidx = keyid >> 6;
Johannes Berg3017b802007-08-28 17:01:53 -04001000
Johannes Berge31b8212010-10-05 19:39:30 +02001001 /* check per-station GTK first, if multicast packet */
1002 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1003 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
Johannes Berg3017b802007-08-28 17:01:53 -04001004
Johannes Berge31b8212010-10-05 19:39:30 +02001005 /* if not found, try default key */
1006 if (!rx->key) {
1007 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1008
1009 /*
1010 * RSNA-protected unicast frames should always be
1011 * sent with pairwise or station-to-station keys,
1012 * but for WEP we allow using a key index as well.
1013 */
1014 if (rx->key &&
1015 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1016 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1017 !is_multicast_ether_addr(hdr->addr1))
1018 rx->key = NULL;
1019 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001020 }
1021
Johannes Berg3017b802007-08-28 17:01:53 -04001022 if (rx->key) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001023 rx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -04001024 /* TODO: add threshold stuff again */
Johannes Berg1990af82007-09-26 17:53:15 +02001025 } else {
Johannes Berge4c26ad2008-01-31 19:48:21 +01001026 return RX_DROP_MONITOR;
Johannes Berg70f08762007-09-26 17:53:14 +02001027 }
1028
Zhu Yi39184b12010-04-08 15:35:10 +08001029 if (skb_linearize(rx->skb))
1030 return RX_DROP_UNUSABLE;
Johannes Berg761ab472010-05-28 14:24:19 +02001031 /* the hdr variable is invalid now! */
Johannes Berg1990af82007-09-26 17:53:15 +02001032
Johannes Berg97359d12010-08-10 09:46:38 +02001033 switch (rx->key->conf.cipher) {
1034 case WLAN_CIPHER_SUITE_WEP40:
1035 case WLAN_CIPHER_SUITE_WEP104:
Johannes Berg761ab472010-05-28 14:24:19 +02001036 /* Check for weak IVs if possible */
1037 if (rx->sta && ieee80211_is_data(fc) &&
1038 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1039 !(status->flag & RX_FLAG_DECRYPTED)) &&
1040 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1041 rx->sta->wep_weak_iv_count++;
1042
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001043 result = ieee80211_crypto_wep_decrypt(rx);
1044 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001045 case WLAN_CIPHER_SUITE_TKIP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001046 result = ieee80211_crypto_tkip_decrypt(rx);
1047 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001048 case WLAN_CIPHER_SUITE_CCMP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001049 result = ieee80211_crypto_ccmp_decrypt(rx);
1050 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001051 case WLAN_CIPHER_SUITE_AES_CMAC:
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +02001052 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1053 break;
Johannes Berg3ffc2a92010-08-27 14:26:52 +03001054 default:
1055 /*
1056 * We can reach here only with HW-only algorithms
1057 * but why didn't it decrypt the frame?!
1058 */
1059 return RX_DROP_UNUSABLE;
Johannes Berg70f08762007-09-26 17:53:14 +02001060 }
1061
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001062 /* either the frame has been decrypted or will be dropped */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001063 status->flag |= RX_FLAG_DECRYPTED;
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001064
1065 return result;
Johannes Berg70f08762007-09-26 17:53:14 +02001066}
1067
Kalle Valo572e0012009-02-10 17:09:31 +02001068static ieee80211_rx_result debug_noinline
1069ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1070{
1071 struct ieee80211_local *local;
1072 struct ieee80211_hdr *hdr;
1073 struct sk_buff *skb;
1074
1075 local = rx->local;
1076 skb = rx->skb;
1077 hdr = (struct ieee80211_hdr *) skb->data;
1078
1079 if (!local->pspolling)
1080 return RX_CONTINUE;
1081
1082 if (!ieee80211_has_fromds(hdr->frame_control))
1083 /* this is not from AP */
1084 return RX_CONTINUE;
1085
1086 if (!ieee80211_is_data(hdr->frame_control))
1087 return RX_CONTINUE;
1088
1089 if (!ieee80211_has_moredata(hdr->frame_control)) {
1090 /* AP has no more frames buffered for us */
1091 local->pspolling = false;
1092 return RX_CONTINUE;
1093 }
1094
1095 /* more data bit is set, let's request a new frame from the AP */
1096 ieee80211_send_pspoll(local, rx->sdata);
1097
1098 return RX_CONTINUE;
1099}
1100
Johannes Berg133b8222008-09-16 14:18:59 +02001101static void ap_sta_ps_start(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001102{
Johannes Berg133b8222008-09-16 14:18:59 +02001103 struct ieee80211_sub_if_data *sdata = sta->sdata;
Christian Lamparter4571d3b2008-11-30 00:48:41 +01001104 struct ieee80211_local *local = sdata->local;
Joe Perches0795af52007-10-03 17:59:30 -07001105
Johannes Berg3e122be2008-07-09 14:40:34 +02001106 atomic_inc(&sdata->bss->num_sta_ps);
Johannes Bergaf818582009-11-06 11:35:50 +01001107 set_sta_flags(sta, WLAN_STA_PS_STA);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001108 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1109 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001110#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001111 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001112 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001113#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1114}
1115
Johannes Bergff9458d2009-10-30 12:56:02 +01001116static void ap_sta_ps_end(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001117{
Johannes Berg133b8222008-09-16 14:18:59 +02001118 struct ieee80211_sub_if_data *sdata = sta->sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02001119
Johannes Berg3e122be2008-07-09 14:40:34 +02001120 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg004c8722008-02-20 11:21:35 +01001121
Johannes Berg571ecf62007-07-27 15:43:22 +02001122#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001123 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001124 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001125#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg004c8722008-02-20 11:21:35 +01001126
Johannes Bergaf818582009-11-06 11:35:50 +01001127 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001128#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Bergaf818582009-11-06 11:35:50 +01001129 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001130 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001131#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Bergaf818582009-11-06 11:35:50 +01001132 return;
1133 }
1134
1135 ieee80211_sta_ps_deliver_wakeup(sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001136}
1137
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001138int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1139{
1140 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1141 bool in_ps;
1142
1143 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1144
1145 /* Don't let the same PS state be set twice */
1146 in_ps = test_sta_flags(sta_inf, WLAN_STA_PS_STA);
1147 if ((start && in_ps) || (!start && !in_ps))
1148 return -EINVAL;
1149
1150 if (start)
1151 ap_sta_ps_start(sta_inf);
1152 else
1153 ap_sta_ps_end(sta_inf);
1154
1155 return 0;
1156}
1157EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1158
Johannes Berg49461622008-06-30 15:10:45 +02001159static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001160ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001161{
1162 struct sta_info *sta = rx->sta;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001163 struct sk_buff *skb = rx->skb;
1164 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1165 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001166
1167 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001168 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001169
Johannes Bergb291ba12009-07-10 15:29:03 +02001170 /*
1171 * Update last_rx only for IBSS packets which are for the current
1172 * BSSID to avoid keeping the current IBSS network alive in cases
1173 * where other STAs start using different BSSID.
1174 */
Johannes Berg05c914f2008-09-11 00:01:58 +02001175 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001176 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +02001177 NL80211_IFTYPE_ADHOC);
Johannes Berg46900292009-02-15 12:44:28 +01001178 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
Johannes Berg571ecf62007-07-27 15:43:22 +02001179 sta->last_rx = jiffies;
Johannes Bergb291ba12009-07-10 15:29:03 +02001180 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1181 /*
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001182 * Mesh beacons will update last_rx when if they are found to
1183 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +02001184 */
Johannes Bergb291ba12009-07-10 15:29:03 +02001185 sta->last_rx = jiffies;
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 Malinenf2ca3ea42009-05-08 12:36:03 +03001533 ieee80211_is_data(fc) &&
Jouni Malinen3cfcf6a2009-01-08 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 Malinenf2ca3ea42009-05-08 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 Malinenf2ca3ea42009-05-08 12:36:03 +03001566 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02001567 }
Jouni Malinenf2ca3ea42009-05-08 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 Malinenf2ca3ea42009-05-08 12:36:03 +03001579 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02001580 }
Jouni Malinenf2ca3ea42009-05-08 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
Zhu Yie31a16d2009-05-21 21:47:03 +08001595__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
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 Fietkauf14543e2009-11-10 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 Fietkauf14543e2009-11-10 20:10:05 +01001602
Johannes Berg9bc383d2009-11-19 11:55:19 +01001603 if (ieee80211_has_a4(hdr->frame_control) &&
1604 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
Felix Fietkauf14543e2009-11-10 20:10:05 +01001605 return -1;
Johannes Berg9bc383d2009-11-19 11:55:19 +01001606
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001607 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1608 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1609
1610 if (!sdata->u.mgd.use_4addr)
1611 return -1;
1612 else
1613 check_port_control = true;
1614 }
1615
Johannes Berg9bc383d2009-11-19 11:55:19 +01001616 if (is_multicast_ether_addr(hdr->addr1) &&
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001617 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
Felix Fietkauf14543e2009-11-10 20:10:05 +01001618 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001619
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001620 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1621 if (ret < 0 || !check_port_control)
1622 return ret;
1623
1624 ehdr = (struct ethhdr *) rx->skb->data;
1625 if (ehdr->h_proto != rx->sdata->control_port_protocol)
1626 return -1;
1627
1628 return 0;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001629}
Johannes Berg571ecf62007-07-27 15:43:22 +02001630
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001631/*
1632 * requires that rx->skb is a frame with ethernet header
1633 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001634static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001635{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301636 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001637 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1638 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1639
1640 /*
1641 * Allow EAPOL frames to us/the PAE group address regardless
1642 * of whether the frame was encrypted or not.
1643 */
Johannes Berga621fa42010-08-27 14:26:54 +03001644 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
Johannes Berg47846c92009-11-25 17:46:19 +01001645 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001646 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1647 return true;
1648
1649 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07001650 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001651 return false;
1652
1653 return true;
1654}
1655
1656/*
1657 * requires that rx->skb is a frame with ethernet header
1658 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001659static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01001660ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001661{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001662 struct ieee80211_sub_if_data *sdata = rx->sdata;
1663 struct net_device *dev = sdata->dev;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001664 struct sk_buff *skb, *xmit_skb;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001665 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1666 struct sta_info *dsta;
Johannes Berg554891e2010-09-24 12:38:25 +02001667 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001668
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001669 skb = rx->skb;
1670 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001671
Johannes Berg05c914f2008-09-11 00:01:58 +02001672 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1673 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02001674 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg554891e2010-09-24 12:38:25 +02001675 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
Johannes Berg9bc383d2009-11-19 11:55:19 +01001676 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001677 if (is_multicast_ether_addr(ehdr->h_dest)) {
1678 /*
1679 * send multicast frames both to higher layers in
1680 * local net stack and back to the wireless medium
1681 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001682 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1683 if (!xmit_skb && net_ratelimit())
Johannes Berg571ecf62007-07-27 15:43:22 +02001684 printk(KERN_DEBUG "%s: failed to clone "
1685 "multicast frame\n", dev->name);
1686 } else {
Johannes Bergabe60632009-11-25 17:46:18 +01001687 dsta = sta_info_get(sdata, skb->data);
1688 if (dsta) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001689 /*
1690 * The destination station is associated to
1691 * this AP (in this VLAN), so send the frame
1692 * directly to it and do not pass it to local
1693 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02001694 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001695 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001696 skb = NULL;
1697 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001698 }
1699 }
1700
1701 if (skb) {
Johannes Bergd1c3a372009-01-07 00:26:10 +01001702 int align __maybe_unused;
1703
Kalle Valo59d9cb02009-12-17 13:54:57 +01001704#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
Johannes Bergd1c3a372009-01-07 00:26:10 +01001705 /*
1706 * 'align' will only take the values 0 or 2 here
1707 * since all frames are required to be aligned
1708 * to 2-byte boundaries when being passed to
1709 * mac80211. That also explains the __skb_push()
1710 * below.
1711 */
matthieu castetdacb6f12009-06-04 22:16:18 +02001712 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01001713 if (align) {
1714 if (WARN_ON(skb_headroom(skb) < 3)) {
1715 dev_kfree_skb(skb);
1716 skb = NULL;
1717 } else {
1718 u8 *data = skb->data;
Zhu Yi8ce0b582009-10-28 13:13:52 -07001719 size_t len = skb_headlen(skb);
1720 skb->data -= align;
1721 memmove(skb->data, data, len);
1722 skb_set_tail_pointer(skb, len);
Johannes Bergd1c3a372009-01-07 00:26:10 +01001723 }
1724 }
1725#endif
1726
1727 if (skb) {
1728 /* deliver to local stack */
1729 skb->protocol = eth_type_trans(skb, dev);
1730 memset(skb->cb, 0, sizeof(skb->cb));
John W. Linville5548a8a2010-06-24 14:25:56 -04001731 netif_receive_skb(skb);
Johannes Bergd1c3a372009-01-07 00:26:10 +01001732 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001733 }
1734
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001735 if (xmit_skb) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001736 /* send to wireless media */
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09001737 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001738 skb_reset_network_header(xmit_skb);
1739 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001740 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001741 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001742}
1743
Johannes Berg49461622008-06-30 15:10:45 +02001744static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001745ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001746{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001747 struct net_device *dev = rx->sdata->dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001748 struct sk_buff *skb = rx->skb;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001749 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1750 __le16 fc = hdr->frame_control;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001751 struct sk_buff_head frame_list;
Johannes Berg554891e2010-09-24 12:38:25 +02001752 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001753
Harvey Harrison358c8d92008-07-15 18:44:13 -07001754 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001755 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001756
Harvey Harrison358c8d92008-07-15 18:44:13 -07001757 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001758 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001759
Johannes Berg554891e2010-09-24 12:38:25 +02001760 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001761 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001762
Zhu Yieaf85ca2009-12-01 10:18:37 +08001763 if (ieee80211_has_a4(hdr->frame_control) &&
1764 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1765 !rx->sdata->u.vlan.sta)
1766 return RX_DROP_UNUSABLE;
1767
1768 if (is_multicast_ether_addr(hdr->addr1) &&
1769 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1770 rx->sdata->u.vlan.sta) ||
1771 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1772 rx->sdata->u.mgd.use_4addr)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001773 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001774
1775 skb->dev = dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001776 __skb_queue_head_init(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001777
Zhu Yie3cf8b32010-03-29 17:35:07 +08001778 if (skb_linearize(skb))
1779 return RX_DROP_UNUSABLE;
1780
Zhu Yieaf85ca2009-12-01 10:18:37 +08001781 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1782 rx->sdata->vif.type,
1783 rx->local->hw.extra_tx_headroom);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001784
Zhu Yieaf85ca2009-12-01 10:18:37 +08001785 while (!skb_queue_empty(&frame_list)) {
1786 rx->skb = __skb_dequeue(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001787
Harvey Harrison358c8d92008-07-15 18:44:13 -07001788 if (!ieee80211_frame_allowed(rx, fc)) {
Zhu Yieaf85ca2009-12-01 10:18:37 +08001789 dev_kfree_skb(rx->skb);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001790 continue;
1791 }
Zhu Yieaf85ca2009-12-01 10:18:37 +08001792 dev->stats.rx_packets++;
1793 dev->stats.rx_bytes += rx->skb->len;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001794
1795 ieee80211_deliver_skb(rx);
1796 }
1797
Johannes Berg9ae54c82008-01-31 19:48:20 +01001798 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001799}
1800
Ingo Molnarbf94e172008-10-12 23:51:38 -07001801#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02001802static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001803ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1804{
1805 struct ieee80211_hdr *hdr;
1806 struct ieee80211s_hdr *mesh_hdr;
1807 unsigned int hdrlen;
1808 struct sk_buff *skb = rx->skb, *fwd_skb;
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001809 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001810 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02001811 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001812
1813 hdr = (struct ieee80211_hdr *) skb->data;
1814 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1815 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1816
1817 if (!ieee80211_is_data(hdr->frame_control))
1818 return RX_CONTINUE;
1819
1820 if (!mesh_hdr->ttl)
1821 /* illegal frame */
1822 return RX_DROP_MONITOR;
1823
Javier Cardona43b7b312009-10-15 18:10:51 -07001824 if (mesh_hdr->flags & MESH_FLAGS_AE) {
YanBo79617de2008-09-22 13:30:32 +08001825 struct mesh_path *mppath;
Javier Cardona43b7b312009-10-15 18:10:51 -07001826 char *proxied_addr;
1827 char *mpp_addr;
1828
1829 if (is_multicast_ether_addr(hdr->addr1)) {
1830 mpp_addr = hdr->addr3;
1831 proxied_addr = mesh_hdr->eaddr1;
1832 } else {
1833 mpp_addr = hdr->addr4;
1834 proxied_addr = mesh_hdr->eaddr2;
1835 }
YanBo79617de2008-09-22 13:30:32 +08001836
YanBo79617de2008-09-22 13:30:32 +08001837 rcu_read_lock();
Javier Cardona43b7b312009-10-15 18:10:51 -07001838 mppath = mpp_path_lookup(proxied_addr, sdata);
YanBo79617de2008-09-22 13:30:32 +08001839 if (!mppath) {
Javier Cardona43b7b312009-10-15 18:10:51 -07001840 mpp_path_add(proxied_addr, mpp_addr, sdata);
YanBo79617de2008-09-22 13:30:32 +08001841 } else {
1842 spin_lock_bh(&mppath->state_lock);
Javier Cardona43b7b312009-10-15 18:10:51 -07001843 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1844 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
YanBo79617de2008-09-22 13:30:32 +08001845 spin_unlock_bh(&mppath->state_lock);
1846 }
1847 rcu_read_unlock();
1848 }
1849
Javier Cardona3c5772a2009-08-10 12:15:48 -07001850 /* Frame has reached destination. Don't forward */
1851 if (!is_multicast_ether_addr(hdr->addr1) &&
Johannes Berg47846c92009-11-25 17:46:19 +01001852 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001853 return RX_CONTINUE;
1854
1855 mesh_hdr->ttl--;
1856
Johannes Berg554891e2010-09-24 12:38:25 +02001857 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001858 if (!mesh_hdr->ttl)
Johannes Berg472dbc42008-09-11 00:01:49 +02001859 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001860 dropped_frames_ttl);
1861 else {
1862 struct ieee80211_hdr *fwd_hdr;
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001863 struct ieee80211_tx_info *info;
1864
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001865 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1866
1867 if (!fwd_skb && net_ratelimit())
1868 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001869 sdata->name);
Milton Miller919bbad2010-12-30 02:01:03 -06001870 if (!fwd_skb)
Johannes Bergb51aff02010-12-22 10:15:07 +01001871 goto out;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001872
1873 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
Johannes Berg47846c92009-11-25 17:46:19 +01001874 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001875 info = IEEE80211_SKB_CB(fwd_skb);
1876 memset(info, 0, sizeof(*info));
1877 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
Johannes Berg5061b0c2009-07-14 00:33:34 +02001878 info->control.vif = &rx->sdata->vif;
Johannes Bergcf0277e2010-01-05 18:00:58 +01001879 skb_set_queue_mapping(skb,
1880 ieee80211_select_queue(rx->sdata, fwd_skb));
1881 ieee80211_set_qos_hdr(local, skb);
Daniel Walkerc8a61a72009-08-18 10:59:00 -07001882 if (is_multicast_ether_addr(fwd_hdr->addr1))
1883 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1884 fwded_mcast);
1885 else {
Javier Cardona3c5772a2009-08-10 12:15:48 -07001886 int err;
1887 /*
1888 * Save TA to addr1 to send TA a path error if a
1889 * suitable next hop is not found
1890 */
1891 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
Javier Cardona249b4052009-07-07 10:55:03 -07001892 ETH_ALEN);
Javier Cardona3c5772a2009-08-10 12:15:48 -07001893 err = mesh_nexthop_lookup(fwd_skb, sdata);
Javier Cardona249b4052009-07-07 10:55:03 -07001894 /* Failed to immediately resolve next hop:
1895 * fwded frame was dropped or will be added
1896 * later to the pending skb queue. */
1897 if (err)
1898 return RX_DROP_MONITOR;
Daniel Walkerc8a61a72009-08-18 10:59:00 -07001899
1900 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1901 fwded_unicast);
Javier Cardona249b4052009-07-07 10:55:03 -07001902 }
1903 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1904 fwded_frames);
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001905 ieee80211_add_pending_skb(local, fwd_skb);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001906 }
1907 }
1908
Johannes Bergb51aff02010-12-22 10:15:07 +01001909 out:
Javier Cardona3c5772a2009-08-10 12:15:48 -07001910 if (is_multicast_ether_addr(hdr->addr1) ||
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001911 sdata->dev->flags & IFF_PROMISC)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001912 return RX_CONTINUE;
1913 else
1914 return RX_DROP_MONITOR;
1915}
Ingo Molnarbf94e172008-10-12 23:51:38 -07001916#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001917
1918static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001919ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001920{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001921 struct ieee80211_sub_if_data *sdata = rx->sdata;
Vivek Natarajane15276a2010-02-08 17:47:01 +05301922 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001923 struct net_device *dev = sdata->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001924 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1925 __le16 fc = hdr->frame_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001926 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001927
Harvey Harrison358c8d92008-07-15 18:44:13 -07001928 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001929 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001930
Harvey Harrison358c8d92008-07-15 18:44:13 -07001931 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001932 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001933
Felix Fietkauf14543e2009-11-10 20:10:05 +01001934 /*
1935 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1936 * that a 4-addr station can be detected and moved into a separate VLAN
1937 */
1938 if (ieee80211_has_a4(hdr->frame_control) &&
1939 sdata->vif.type == NL80211_IFTYPE_AP)
1940 return RX_DROP_MONITOR;
1941
Zhu Yie31a16d2009-05-21 21:47:03 +08001942 err = __ieee80211_data_to_8023(rx);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001943 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001944 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001945
Harvey Harrison358c8d92008-07-15 18:44:13 -07001946 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001947 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001948
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001949 rx->skb->dev = dev;
1950
1951 dev->stats.rx_packets++;
1952 dev->stats.rx_bytes += rx->skb->len;
1953
Helmut Schaa08ca9442010-11-30 12:19:34 +01001954 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
Rajkumar Manoharan8c99f692011-02-02 22:57:53 +05301955 !is_multicast_ether_addr(
1956 ((struct ethhdr *)rx->skb->data)->h_dest) &&
1957 (!local->scanning &&
1958 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
Vivek Natarajane15276a2010-02-08 17:47:01 +05301959 mod_timer(&local->dynamic_ps_timer, jiffies +
1960 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1961 }
1962
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001963 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02001964
Johannes Berg9ae54c82008-01-31 19:48:20 +01001965 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001966}
1967
Johannes Berg49461622008-06-30 15:10:45 +02001968static ieee80211_rx_result debug_noinline
Christian Lamparter24a8fda2010-12-30 17:25:29 +01001969ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
Ron Rindjunsky71364712007-12-25 17:00:36 +02001970{
1971 struct ieee80211_local *local = rx->local;
1972 struct ieee80211_hw *hw = &local->hw;
1973 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07001974 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001975 struct tid_ampdu_rx *tid_agg_rx;
1976 u16 start_seq_num;
1977 u16 tid;
1978
Harvey Harrisona7767f92008-07-02 16:30:51 -07001979 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001980 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001981
Harvey Harrisona7767f92008-07-02 16:30:51 -07001982 if (ieee80211_is_back_req(bar->frame_control)) {
Johannes Berg8ae59772010-05-30 14:52:58 +02001983 struct {
1984 __le16 control, start_seq_num;
1985 } __packed bar_data;
1986
Ron Rindjunsky71364712007-12-25 17:00:36 +02001987 if (!rx->sta)
Johannes Berga02ae752009-11-16 12:00:40 +01001988 return RX_DROP_MONITOR;
Johannes Berg8ae59772010-05-30 14:52:58 +02001989
1990 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1991 &bar_data, sizeof(bar_data)))
1992 return RX_DROP_MONITOR;
1993
Johannes Berg8ae59772010-05-30 14:52:58 +02001994 tid = le16_to_cpu(bar_data.control) >> 12;
Johannes Berga87f7362010-06-10 10:21:38 +02001995
1996 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1997 if (!tid_agg_rx)
Johannes Berga02ae752009-11-16 12:00:40 +01001998 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001999
Johannes Berg8ae59772010-05-30 14:52:58 +02002000 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002001
2002 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01002003 if (tid_agg_rx->timeout)
2004 mod_timer(&tid_agg_rx->session_timer,
2005 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02002006
Johannes Bergdd318572010-11-29 11:09:16 +01002007 spin_lock(&tid_agg_rx->reorder_lock);
Johannes Berga02ae752009-11-16 12:00:40 +01002008 /* release stored frames up to start of BAR */
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002009 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
Johannes Bergdd318572010-11-29 11:09:16 +01002010 spin_unlock(&tid_agg_rx->reorder_lock);
2011
Johannes Berga02ae752009-11-16 12:00:40 +01002012 kfree_skb(skb);
2013 return RX_QUEUED;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002014 }
2015
Johannes Berg08daeca2010-05-30 14:53:43 +02002016 /*
2017 * After this point, we only want management frames,
2018 * so we can drop all remaining control frames to
2019 * cooked monitor interfaces.
2020 */
2021 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002022}
2023
Jouni Malinenf4f727a2009-01-10 11:46:53 +02002024static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2025 struct ieee80211_mgmt *mgmt,
2026 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02002027{
2028 struct ieee80211_local *local = sdata->local;
2029 struct sk_buff *skb;
2030 struct ieee80211_mgmt *resp;
2031
Johannes Berg47846c92009-11-25 17:46:19 +01002032 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
Jouni Malinenfea14732009-01-08 13:32:06 +02002033 /* Not to own unicast address */
2034 return;
2035 }
2036
Johannes Berg46900292009-02-15 12:44:28 +01002037 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2038 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
Johannes Berg77fdaa12009-07-07 03:45:17 +02002039 /* Not from the current AP or not associated yet. */
Jouni Malinenfea14732009-01-08 13:32:06 +02002040 return;
2041 }
2042
2043 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2044 /* Too short SA Query request frame */
2045 return;
2046 }
2047
2048 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2049 if (skb == NULL)
2050 return;
2051
2052 skb_reserve(skb, local->hw.extra_tx_headroom);
2053 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2054 memset(resp, 0, 24);
2055 memcpy(resp->da, mgmt->sa, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01002056 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01002057 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02002058 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2059 IEEE80211_STYPE_ACTION);
2060 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2061 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2062 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2063 memcpy(resp->u.action.u.sa_query.trans_id,
2064 mgmt->u.action.u.sa_query.trans_id,
2065 WLAN_SA_QUERY_TR_ID_LEN);
2066
Johannes Berg62ae67b2009-11-18 18:42:05 +01002067 ieee80211_tx_skb(sdata, skb);
Jouni Malinenfea14732009-01-08 13:32:06 +02002068}
2069
Johannes Berg49461622008-06-30 15:10:45 +02002070static ieee80211_rx_result debug_noinline
Johannes Berg2e161f72010-08-12 15:38:38 +02002071ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2072{
2073 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002074 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002075
2076 /*
2077 * From here on, look only at management frames.
2078 * Data and control frames are already handled,
2079 * and unknown (reserved) frames are useless.
2080 */
2081 if (rx->skb->len < 24)
2082 return RX_DROP_MONITOR;
2083
2084 if (!ieee80211_is_mgmt(mgmt->frame_control))
2085 return RX_DROP_MONITOR;
2086
Johannes Berg554891e2010-09-24 12:38:25 +02002087 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg2e161f72010-08-12 15:38:38 +02002088 return RX_DROP_MONITOR;
2089
2090 if (ieee80211_drop_unencrypted_mgmt(rx))
2091 return RX_DROP_UNUSABLE;
2092
2093 return RX_CONTINUE;
2094}
2095
2096static ieee80211_rx_result debug_noinline
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002097ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2098{
2099 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002100 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002101 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002102 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002103 int len = rx->skb->len;
2104
2105 if (!ieee80211_is_action(mgmt->frame_control))
2106 return RX_CONTINUE;
2107
Jouni Malinen026331c2010-02-15 12:53:10 +02002108 /* drop too small frames */
2109 if (len < IEEE80211_MIN_ACTION_SIZE)
2110 return RX_DROP_UNUSABLE;
2111
2112 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
Johannes Berg84040802010-02-15 12:46:39 +02002113 return RX_DROP_UNUSABLE;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002114
Johannes Berg554891e2010-09-24 12:38:25 +02002115 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg84040802010-02-15 12:46:39 +02002116 return RX_DROP_UNUSABLE;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002117
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002118 switch (mgmt->u.action.category) {
2119 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01002120 /*
2121 * The aggregation code is not prepared to handle
2122 * anything but STA/AP due to the BSSID handling;
2123 * IBSS could work in the code but isn't supported
2124 * by drivers or the standard.
2125 */
2126 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2127 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2128 sdata->vif.type != NL80211_IFTYPE_AP)
Johannes Berg84040802010-02-15 12:46:39 +02002129 break;
Johannes Berg8abd3f92009-02-10 21:25:47 +01002130
Jouni Malinen026331c2010-02-15 12:53:10 +02002131 /* verify action_code is present */
2132 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2133 break;
2134
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002135 switch (mgmt->u.action.u.addba_req.action_code) {
2136 case WLAN_ACTION_ADDBA_REQ:
2137 if (len < (IEEE80211_MIN_ACTION_SIZE +
2138 sizeof(mgmt->u.action.u.addba_req)))
Johannes Bergbed7ee62010-06-10 10:21:35 +02002139 goto invalid;
2140 break;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002141 case WLAN_ACTION_ADDBA_RESP:
2142 if (len < (IEEE80211_MIN_ACTION_SIZE +
2143 sizeof(mgmt->u.action.u.addba_resp)))
Johannes Bergbed7ee62010-06-10 10:21:35 +02002144 goto invalid;
2145 break;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002146 case WLAN_ACTION_DELBA:
2147 if (len < (IEEE80211_MIN_ACTION_SIZE +
2148 sizeof(mgmt->u.action.u.delba)))
Johannes Bergbed7ee62010-06-10 10:21:35 +02002149 goto invalid;
2150 break;
2151 default:
2152 goto invalid;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002153 }
Johannes Bergbed7ee62010-06-10 10:21:35 +02002154
Johannes Berg8b58ff82010-06-10 10:21:51 +02002155 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002156 case WLAN_CATEGORY_SPECTRUM_MGMT:
2157 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
Johannes Berg84040802010-02-15 12:46:39 +02002158 break;
Johannes Berg46900292009-02-15 12:44:28 +01002159
2160 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002161 break;
Johannes Berg46900292009-02-15 12:44:28 +01002162
Jouni Malinen026331c2010-02-15 12:53:10 +02002163 /* verify action_code is present */
2164 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2165 break;
2166
Johannes Berg39192c02008-09-09 14:49:03 +02002167 switch (mgmt->u.action.u.measurement.action_code) {
2168 case WLAN_ACTION_SPCT_MSR_REQ:
2169 if (len < (IEEE80211_MIN_ACTION_SIZE +
2170 sizeof(mgmt->u.action.u.measurement)))
Johannes Berg84040802010-02-15 12:46:39 +02002171 break;
Johannes Berg39192c02008-09-09 14:49:03 +02002172 ieee80211_process_measurement_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002173 goto handled;
Sujithc481ec92009-01-06 09:28:37 +05302174 case WLAN_ACTION_SPCT_CHL_SWITCH:
2175 if (len < (IEEE80211_MIN_ACTION_SIZE +
2176 sizeof(mgmt->u.action.u.chan_switch)))
Johannes Berg84040802010-02-15 12:46:39 +02002177 break;
Sujithc481ec92009-01-06 09:28:37 +05302178
Johannes Bergcc32abd2009-05-15 11:52:31 +02002179 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002180 break;
Johannes Bergcc32abd2009-05-15 11:52:31 +02002181
Johannes Berg46900292009-02-15 12:44:28 +01002182 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
Johannes Berg84040802010-02-15 12:46:39 +02002183 break;
Sujithc481ec92009-01-06 09:28:37 +05302184
Johannes Berg8b58ff82010-06-10 10:21:51 +02002185 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002186 }
2187 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002188 case WLAN_CATEGORY_SA_QUERY:
2189 if (len < (IEEE80211_MIN_ACTION_SIZE +
2190 sizeof(mgmt->u.action.u.sa_query)))
Johannes Berg84040802010-02-15 12:46:39 +02002191 break;
2192
Jouni Malinenfea14732009-01-08 13:32:06 +02002193 switch (mgmt->u.action.u.sa_query.action) {
2194 case WLAN_ACTION_SA_QUERY_REQUEST:
2195 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002196 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002197 ieee80211_process_sa_query_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002198 goto handled;
Jouni Malinenfea14732009-01-08 13:32:06 +02002199 }
2200 break;
Javier Cardona97ad9132010-03-29 11:00:21 -07002201 case WLAN_CATEGORY_MESH_PLINK:
Johannes Berg77a121c2010-06-10 10:21:34 +02002202 if (!ieee80211_vif_is_mesh(&sdata->vif))
2203 break;
Johannes Berg8b58ff82010-06-10 10:21:51 +02002204 goto queue;
Javier Cardonac7108a72010-12-16 17:37:50 -08002205 case WLAN_CATEGORY_MESH_PATH_SEL:
2206 if (!mesh_path_sel_is_hwmp(sdata))
2207 break;
2208 goto queue;
Johannes Berg84040802010-02-15 12:46:39 +02002209 }
Jouni Malinen026331c2010-02-15 12:53:10 +02002210
Johannes Berg2e161f72010-08-12 15:38:38 +02002211 return RX_CONTINUE;
2212
Johannes Bergbed7ee62010-06-10 10:21:35 +02002213 invalid:
Johannes Berg554891e2010-09-24 12:38:25 +02002214 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
Johannes Berg2e161f72010-08-12 15:38:38 +02002215 /* will return in the next handlers */
2216 return RX_CONTINUE;
2217
2218 handled:
2219 if (rx->sta)
2220 rx->sta->rx_packets++;
2221 dev_kfree_skb(rx->skb);
2222 return RX_QUEUED;
2223
2224 queue:
2225 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2226 skb_queue_tail(&sdata->skb_queue, rx->skb);
2227 ieee80211_queue_work(&local->hw, &sdata->work);
2228 if (rx->sta)
2229 rx->sta->rx_packets++;
2230 return RX_QUEUED;
2231}
2232
2233static ieee80211_rx_result debug_noinline
2234ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2235{
Johannes Berg554891e2010-09-24 12:38:25 +02002236 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002237
2238 /* skip known-bad action frames and return them in the next handler */
Johannes Berg554891e2010-09-24 12:38:25 +02002239 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
Johannes Berg2e161f72010-08-12 15:38:38 +02002240 return RX_CONTINUE;
Felix Fietkaud7907442010-01-07 20:23:53 +01002241
Jouni Malinen026331c2010-02-15 12:53:10 +02002242 /*
2243 * Getting here means the kernel doesn't know how to handle
2244 * it, but maybe userspace does ... include returned frames
2245 * so userspace can register for those to know whether ones
2246 * it transmitted were processed or returned.
2247 */
Jouni Malinen026331c2010-02-15 12:53:10 +02002248
Johannes Berg2e161f72010-08-12 15:38:38 +02002249 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2250 rx->skb->data, rx->skb->len,
2251 GFP_ATOMIC)) {
2252 if (rx->sta)
2253 rx->sta->rx_packets++;
2254 dev_kfree_skb(rx->skb);
2255 return RX_QUEUED;
2256 }
2257
2258
2259 return RX_CONTINUE;
2260}
2261
2262static ieee80211_rx_result debug_noinline
2263ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2264{
2265 struct ieee80211_local *local = rx->local;
2266 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2267 struct sk_buff *nskb;
2268 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02002269 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002270
2271 if (!ieee80211_is_action(mgmt->frame_control))
2272 return RX_CONTINUE;
2273
2274 /*
2275 * For AP mode, hostapd is responsible for handling any action
2276 * frames that we didn't handle, including returning unknown
2277 * ones. For all other modes we will return them to the sender,
2278 * setting the 0x80 bit in the action category, as required by
2279 * 802.11-2007 7.3.1.11.
2280 * Newer versions of hostapd shall also use the management frame
2281 * registration mechanisms, but older ones still use cooked
2282 * monitor interfaces so push all frames there.
2283 */
Johannes Berg554891e2010-09-24 12:38:25 +02002284 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
Johannes Berg2e161f72010-08-12 15:38:38 +02002285 (sdata->vif.type == NL80211_IFTYPE_AP ||
2286 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2287 return RX_DROP_MONITOR;
Jouni Malinen026331c2010-02-15 12:53:10 +02002288
Johannes Berg84040802010-02-15 12:46:39 +02002289 /* do not return rejected action frames */
2290 if (mgmt->u.action.category & 0x80)
2291 return RX_DROP_UNUSABLE;
2292
2293 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2294 GFP_ATOMIC);
2295 if (nskb) {
John W. Linville292b4df2010-06-24 11:13:56 -04002296 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
Johannes Berg84040802010-02-15 12:46:39 +02002297
John W. Linville292b4df2010-06-24 11:13:56 -04002298 nmgmt->u.action.category |= 0x80;
2299 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2300 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
Johannes Berg84040802010-02-15 12:46:39 +02002301
2302 memset(nskb->cb, 0, sizeof(nskb->cb));
2303
2304 ieee80211_tx_skb(rx->sdata, nskb);
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002305 }
Johannes Berg39192c02008-09-09 14:49:03 +02002306 dev_kfree_skb(rx->skb);
2307 return RX_QUEUED;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002308}
2309
2310static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002311ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02002312{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002313 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergaf6b6372009-12-23 13:15:35 +01002314 ieee80211_rx_result rxs;
Johannes Berg77a121c2010-06-10 10:21:34 +02002315 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2316 __le16 stype;
Johannes Berg571ecf62007-07-27 15:43:22 +02002317
Johannes Bergaf6b6372009-12-23 13:15:35 +01002318 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2319 if (rxs != RX_CONTINUE)
2320 return rxs;
2321
Johannes Berg77a121c2010-06-10 10:21:34 +02002322 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
Johannes Berg472dbc42008-09-11 00:01:49 +02002323
Johannes Berg77a121c2010-06-10 10:21:34 +02002324 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2325 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2326 sdata->vif.type != NL80211_IFTYPE_STATION)
2327 return RX_DROP_MONITOR;
Johannes Bergf9d540e2007-09-28 14:02:09 +02002328
Johannes Berg77a121c2010-06-10 10:21:34 +02002329 switch (stype) {
2330 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2331 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2332 /* process for all: mesh, mlme, ibss */
2333 break;
2334 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2335 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
Christian Lamparter2c313332010-11-29 20:53:23 +01002336 if (is_multicast_ether_addr(mgmt->da) &&
2337 !is_broadcast_ether_addr(mgmt->da))
2338 return RX_DROP_MONITOR;
2339
Johannes Berg77a121c2010-06-10 10:21:34 +02002340 /* process only for station */
2341 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2342 return RX_DROP_MONITOR;
2343 break;
2344 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2345 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2346 /* process only for ibss */
2347 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2348 return RX_DROP_MONITOR;
2349 break;
2350 default:
2351 return RX_DROP_MONITOR;
2352 }
Johannes Berg46900292009-02-15 12:44:28 +01002353
Johannes Berg77a121c2010-06-10 10:21:34 +02002354 /* queue up frame and kick off work to process it */
Johannes Bergc1475ca2010-06-10 10:21:37 +02002355 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg77a121c2010-06-10 10:21:34 +02002356 skb_queue_tail(&sdata->skb_queue, rx->skb);
2357 ieee80211_queue_work(&rx->local->hw, &sdata->work);
Johannes Berg8b58ff82010-06-10 10:21:51 +02002358 if (rx->sta)
2359 rx->sta->rx_packets++;
Johannes Berg77a121c2010-06-10 10:21:34 +02002360
2361 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002362}
2363
Johannes Berg3b8d81e2009-06-17 17:43:56 +02002364static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
Johannes Berg5cf121c2008-02-25 16:27:43 +01002365 struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02002366{
Harvey Harrisona7767f92008-07-02 16:30:51 -07002367 int keyidx;
2368 unsigned int hdrlen;
Johannes Berg571ecf62007-07-27 15:43:22 +02002369
Harvey Harrisona7767f92008-07-02 16:30:51 -07002370 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +02002371 if (rx->skb->len >= hdrlen + 4)
2372 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2373 else
2374 keyidx = -1;
2375
Johannes Berg8944b792008-01-31 19:48:26 +01002376 if (!rx->sta) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02002377 /*
2378 * Some hardware seem to generate incorrect Michael MIC
2379 * reports; ignore them to avoid triggering countermeasures.
2380 */
Johannes Bergaf2ced62009-11-16 12:00:39 +01002381 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002382 }
2383
Harvey Harrisona7767f92008-07-02 16:30:51 -07002384 if (!ieee80211_has_protected(hdr->frame_control))
Johannes Bergaf2ced62009-11-16 12:00:39 +01002385 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002386
Johannes Berg05c914f2008-09-11 00:01:58 +02002387 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02002388 /*
2389 * APs with pairwise keys should never receive Michael MIC
2390 * errors for non-zero keyidx because these are reserved for
2391 * group keys and only the AP is sending real multicast
2392 * frames in the BSS.
2393 */
Johannes Bergaf2ced62009-11-16 12:00:39 +01002394 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002395 }
2396
Harvey Harrisona7767f92008-07-02 16:30:51 -07002397 if (!ieee80211_is_data(hdr->frame_control) &&
2398 !ieee80211_is_auth(hdr->frame_control))
Johannes Bergaf2ced62009-11-16 12:00:39 +01002399 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002400
Johannes Berge6d6e342009-07-01 21:26:47 +02002401 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2402 GFP_ATOMIC);
Johannes Berg571ecf62007-07-27 15:43:22 +02002403}
2404
Johannes Berg5cf121c2008-02-25 16:27:43 +01002405/* TODO: use IEEE80211_RX_FRAGMENTED */
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002406static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2407 struct ieee80211_rate *rate)
Michael Wu3d30d942008-01-31 19:48:27 +01002408{
2409 struct ieee80211_sub_if_data *sdata;
2410 struct ieee80211_local *local = rx->local;
2411 struct ieee80211_rtap_hdr {
2412 struct ieee80211_radiotap_header hdr;
2413 u8 flags;
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002414 u8 rate_or_pad;
Michael Wu3d30d942008-01-31 19:48:27 +01002415 __le16 chan_freq;
2416 __le16 chan_flags;
Eric Dumazetbc105022010-06-03 03:21:52 -07002417 } __packed *rthdr;
Michael Wu3d30d942008-01-31 19:48:27 +01002418 struct sk_buff *skb = rx->skb, *skb2;
2419 struct net_device *prev_dev = NULL;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002420 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Michael Wu3d30d942008-01-31 19:48:27 +01002421
Johannes Berg554891e2010-09-24 12:38:25 +02002422 /*
2423 * If cooked monitor has been processed already, then
2424 * don't do it again. If not, set the flag.
2425 */
2426 if (rx->flags & IEEE80211_RX_CMNTR)
John W. Linville7c1e1832010-09-24 15:52:49 -04002427 goto out_free_skb;
Johannes Berg554891e2010-09-24 12:38:25 +02002428 rx->flags |= IEEE80211_RX_CMNTR;
John W. Linville7c1e1832010-09-24 15:52:49 -04002429
Michael Wu3d30d942008-01-31 19:48:27 +01002430 if (skb_headroom(skb) < sizeof(*rthdr) &&
2431 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2432 goto out_free_skb;
2433
2434 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2435 memset(rthdr, 0, sizeof(*rthdr));
2436 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2437 rthdr->hdr.it_present =
2438 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
Michael Wu3d30d942008-01-31 19:48:27 +01002439 (1 << IEEE80211_RADIOTAP_CHANNEL));
2440
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002441 if (rate) {
2442 rthdr->rate_or_pad = rate->bitrate / 5;
2443 rthdr->hdr.it_present |=
2444 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2445 }
Michael Wu3d30d942008-01-31 19:48:27 +01002446 rthdr->chan_freq = cpu_to_le16(status->freq);
2447
2448 if (status->band == IEEE80211_BAND_5GHZ)
2449 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2450 IEEE80211_CHAN_5GHZ);
2451 else
2452 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2453 IEEE80211_CHAN_2GHZ);
2454
2455 skb_set_mac_header(skb, 0);
2456 skb->ip_summed = CHECKSUM_UNNECESSARY;
2457 skb->pkt_type = PACKET_OTHERHOST;
2458 skb->protocol = htons(ETH_P_802_2);
2459
2460 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01002461 if (!ieee80211_sdata_running(sdata))
Michael Wu3d30d942008-01-31 19:48:27 +01002462 continue;
2463
Johannes Berg05c914f2008-09-11 00:01:58 +02002464 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Michael Wu3d30d942008-01-31 19:48:27 +01002465 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2466 continue;
2467
2468 if (prev_dev) {
2469 skb2 = skb_clone(skb, GFP_ATOMIC);
2470 if (skb2) {
2471 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04002472 netif_receive_skb(skb2);
Michael Wu3d30d942008-01-31 19:48:27 +01002473 }
2474 }
2475
2476 prev_dev = sdata->dev;
2477 sdata->dev->stats.rx_packets++;
2478 sdata->dev->stats.rx_bytes += skb->len;
2479 }
2480
2481 if (prev_dev) {
2482 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04002483 netif_receive_skb(skb);
Johannes Berg554891e2010-09-24 12:38:25 +02002484 return;
2485 }
Michael Wu3d30d942008-01-31 19:48:27 +01002486
2487 out_free_skb:
2488 dev_kfree_skb(skb);
2489}
2490
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002491static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2492 ieee80211_rx_result res)
2493{
2494 switch (res) {
2495 case RX_DROP_MONITOR:
2496 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2497 if (rx->sta)
2498 rx->sta->rx_dropped++;
2499 /* fall through */
2500 case RX_CONTINUE: {
2501 struct ieee80211_rate *rate = NULL;
2502 struct ieee80211_supported_band *sband;
2503 struct ieee80211_rx_status *status;
2504
2505 status = IEEE80211_SKB_RXCB((rx->skb));
2506
2507 sband = rx->local->hw.wiphy->bands[status->band];
2508 if (!(status->flag & RX_FLAG_HT))
2509 rate = &sband->bitrates[status->rate_idx];
2510
2511 ieee80211_rx_cooked_monitor(rx, rate);
2512 break;
2513 }
2514 case RX_DROP_UNUSABLE:
2515 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2516 if (rx->sta)
2517 rx->sta->rx_dropped++;
2518 dev_kfree_skb(rx->skb);
2519 break;
2520 case RX_QUEUED:
2521 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2522 break;
2523 }
2524}
2525
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002526static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002527{
2528 ieee80211_rx_result res = RX_DROP_MONITOR;
2529 struct sk_buff *skb;
2530
2531#define CALL_RXH(rxh) \
2532 do { \
2533 res = rxh(rx); \
2534 if (res != RX_CONTINUE) \
2535 goto rxh_next; \
2536 } while (0);
2537
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002538 spin_lock(&rx->local->rx_skb_queue.lock);
2539 if (rx->local->running_rx_handler)
2540 goto unlock;
2541
2542 rx->local->running_rx_handler = true;
2543
2544 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2545 spin_unlock(&rx->local->rx_skb_queue.lock);
2546
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002547 /*
2548 * all the other fields are valid across frames
2549 * that belong to an aMPDU since they are on the
2550 * same TID from the same station
2551 */
2552 rx->skb = skb;
Johannes Berg554891e2010-09-24 12:38:25 +02002553 rx->flags = 0;
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002554
2555 CALL_RXH(ieee80211_rx_h_decrypt)
2556 CALL_RXH(ieee80211_rx_h_check_more_data)
2557 CALL_RXH(ieee80211_rx_h_sta_process)
2558 CALL_RXH(ieee80211_rx_h_defragment)
2559 CALL_RXH(ieee80211_rx_h_ps_poll)
2560 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2561 /* must be after MMIC verify so header is counted in MPDU mic */
2562 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2563 CALL_RXH(ieee80211_rx_h_amsdu)
2564#ifdef CONFIG_MAC80211_MESH
2565 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2566 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2567#endif
2568 CALL_RXH(ieee80211_rx_h_data)
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002569 CALL_RXH(ieee80211_rx_h_ctrl);
Johannes Berg2e161f72010-08-12 15:38:38 +02002570 CALL_RXH(ieee80211_rx_h_mgmt_check)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002571 CALL_RXH(ieee80211_rx_h_action)
Johannes Berg2e161f72010-08-12 15:38:38 +02002572 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2573 CALL_RXH(ieee80211_rx_h_action_return)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002574 CALL_RXH(ieee80211_rx_h_mgmt)
2575
2576 rxh_next:
2577 ieee80211_rx_handlers_result(rx, res);
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002578 spin_lock(&rx->local->rx_skb_queue.lock);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002579#undef CALL_RXH
2580 }
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002581
2582 rx->local->running_rx_handler = false;
2583
2584 unlock:
2585 spin_unlock(&rx->local->rx_skb_queue.lock);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002586}
Johannes Berg571ecf62007-07-27 15:43:22 +02002587
Johannes Berg4406c372010-09-24 11:21:06 +02002588static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
Johannes Berg58905292008-01-31 19:48:25 +01002589{
Johannes Berg58905292008-01-31 19:48:25 +01002590 ieee80211_rx_result res = RX_DROP_MONITOR;
2591
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002592#define CALL_RXH(rxh) \
2593 do { \
2594 res = rxh(rx); \
2595 if (res != RX_CONTINUE) \
Johannes Berg2569a822009-11-25 17:46:17 +01002596 goto rxh_next; \
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002597 } while (0);
Johannes Berg58905292008-01-31 19:48:25 +01002598
Johannes Berg49461622008-06-30 15:10:45 +02002599 CALL_RXH(ieee80211_rx_h_passive_scan)
2600 CALL_RXH(ieee80211_rx_h_check)
Johannes Berg2569a822009-11-25 17:46:17 +01002601
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002602 ieee80211_rx_reorder_ampdu(rx);
Johannes Berg2569a822009-11-25 17:46:17 +01002603
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002604 ieee80211_rx_handlers(rx);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002605 return;
Johannes Berg49461622008-06-30 15:10:45 +02002606
Johannes Berg2569a822009-11-25 17:46:17 +01002607 rxh_next:
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002608 ieee80211_rx_handlers_result(rx, res);
2609
2610#undef CALL_RXH
Johannes Berg58905292008-01-31 19:48:25 +01002611}
2612
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002613/*
Johannes Bergdd318572010-11-29 11:09:16 +01002614 * This function makes calls into the RX path, therefore
2615 * it has to be invoked under RCU read lock.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002616 */
2617void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2618{
Johannes Berg554891e2010-09-24 12:38:25 +02002619 struct ieee80211_rx_data rx = {
2620 .sta = sta,
2621 .sdata = sta->sdata,
2622 .local = sta->local,
2623 .queue = tid,
2624 };
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02002625 struct tid_ampdu_rx *tid_agg_rx;
2626
2627 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2628 if (!tid_agg_rx)
2629 return;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002630
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02002631 spin_lock(&tid_agg_rx->reorder_lock);
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002632 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02002633 spin_unlock(&tid_agg_rx->reorder_lock);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002634
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002635 ieee80211_rx_handlers(&rx);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002636}
2637
Johannes Berg571ecf62007-07-27 15:43:22 +02002638/* main receive path */
2639
Johannes Berg20b01f82010-09-24 11:21:05 +02002640static int prepare_for_handlers(struct ieee80211_rx_data *rx,
Johannes Berg23a24de2007-07-27 15:43:22 +02002641 struct ieee80211_hdr *hdr)
2642{
Johannes Berg20b01f82010-09-24 11:21:05 +02002643 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002644 struct sk_buff *skb = rx->skb;
2645 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2646 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02002647 int multicast = is_multicast_ether_addr(hdr->addr1);
2648
Johannes Berg51fb61e2007-12-19 01:31:27 +01002649 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02002650 case NL80211_IFTYPE_STATION:
Johannes Berg9bc383d2009-11-19 11:55:19 +01002651 if (!bssid && !sdata->u.mgd.use_4addr)
Johannes Berg23a24de2007-07-27 15:43:22 +02002652 return 0;
Johannes Berg77fdaa12009-07-07 03:45:17 +02002653 if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002654 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002655 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002656 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02002657 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002658 }
2659 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002660 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02002661 if (!bssid)
2662 return 0;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002663 if (ieee80211_is_beacon(hdr->frame_control)) {
Bruno Randolf9d9bf772008-02-18 11:21:36 +09002664 return 1;
Vladimir Koutny87291c02008-06-13 16:50:44 +02002665 }
Johannes Berg46900292009-02-15 12:44:28 +01002666 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
Johannes Berg554891e2010-09-24 12:38:25 +02002667 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002668 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02002669 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002670 } else if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002671 compare_ether_addr(sdata->vif.addr,
Johannes Berg23a24de2007-07-27 15:43:22 +02002672 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002673 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002674 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02002675 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002676 } else if (!rx->sta) {
2677 int rate_idx;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002678 if (status->flag & RX_FLAG_HT)
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002679 rate_idx = 0; /* TODO: HT rates */
2680 else
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002681 rate_idx = status->rate_idx;
Johannes Berg34e89502010-02-03 13:59:58 +01002682 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2683 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002684 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002685 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002686 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg6032f932008-02-23 15:17:07 +01002687 if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002688 compare_ether_addr(sdata->vif.addr,
Johannes Berg6032f932008-02-23 15:17:07 +01002689 hdr->addr1) != 0) {
2690 if (!(sdata->dev->flags & IFF_PROMISC))
2691 return 0;
2692
Johannes Berg554891e2010-09-24 12:38:25 +02002693 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg6032f932008-02-23 15:17:07 +01002694 }
2695 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002696 case NL80211_IFTYPE_AP_VLAN:
2697 case NL80211_IFTYPE_AP:
Johannes Berg23a24de2007-07-27 15:43:22 +02002698 if (!bssid) {
Johannes Berg47846c92009-11-25 17:46:19 +01002699 if (compare_ether_addr(sdata->vif.addr,
Johannes Berg23a24de2007-07-27 15:43:22 +02002700 hdr->addr1))
2701 return 0;
2702 } else if (!ieee80211_bssid_match(bssid,
Johannes Berg47846c92009-11-25 17:46:19 +01002703 sdata->vif.addr)) {
Arik Nemtsov771bbd02011-02-01 13:23:05 +02002704 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2705 !ieee80211_is_beacon(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02002706 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02002707 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002708 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002709 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002710 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07002711 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02002712 return 0;
2713 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2714 return 0;
2715 break;
Johannes Berg2ca27bc2010-09-16 14:58:23 +02002716 default:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02002717 /* should never get here */
2718 WARN_ON(1);
2719 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02002720 }
2721
2722 return 1;
2723}
2724
Johannes Berg571ecf62007-07-27 15:43:22 +02002725/*
Johannes Berg4406c372010-09-24 11:21:06 +02002726 * This function returns whether or not the SKB
2727 * was destined for RX processing or not, which,
2728 * if consume is true, is equivalent to whether
2729 * or not the skb was consumed.
2730 */
2731static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2732 struct sk_buff *skb, bool consume)
2733{
2734 struct ieee80211_local *local = rx->local;
2735 struct ieee80211_sub_if_data *sdata = rx->sdata;
2736 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2737 struct ieee80211_hdr *hdr = (void *)skb->data;
2738 int prepares;
2739
2740 rx->skb = skb;
Johannes Berg554891e2010-09-24 12:38:25 +02002741 status->rx_flags |= IEEE80211_RX_RA_MATCH;
Johannes Berg4406c372010-09-24 11:21:06 +02002742 prepares = prepare_for_handlers(rx, hdr);
2743
2744 if (!prepares)
2745 return false;
2746
2747 if (status->flag & RX_FLAG_MMIC_ERROR) {
Johannes Berg554891e2010-09-24 12:38:25 +02002748 if (status->rx_flags & IEEE80211_RX_RA_MATCH)
Johannes Berg4406c372010-09-24 11:21:06 +02002749 ieee80211_rx_michael_mic_report(hdr, rx);
2750 return false;
2751 }
2752
2753 if (!consume) {
2754 skb = skb_copy(skb, GFP_ATOMIC);
2755 if (!skb) {
2756 if (net_ratelimit())
2757 wiphy_debug(local->hw.wiphy,
Ben Greearb305dae2011-01-08 10:30:54 -08002758 "failed to copy skb for %s\n",
Johannes Berg4406c372010-09-24 11:21:06 +02002759 sdata->name);
2760 return true;
2761 }
2762
2763 rx->skb = skb;
2764 }
2765
2766 ieee80211_invoke_rx_handlers(rx);
2767 return true;
2768}
2769
2770/*
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002771 * This is the actual Rx frames handler. as it blongs to Rx path it must
2772 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02002773 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002774static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
Christian Lamparter071d9ac2010-08-05 01:36:36 +02002775 struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02002776{
Johannes Berg554891e2010-09-24 12:38:25 +02002777 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002778 struct ieee80211_local *local = hw_to_local(hw);
2779 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002780 struct ieee80211_hdr *hdr;
Zhu Yie3cf8b32010-03-29 17:35:07 +08002781 __le16 fc;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002782 struct ieee80211_rx_data rx;
Johannes Berg4406c372010-09-24 11:21:06 +02002783 struct ieee80211_sub_if_data *prev;
Ben Greear56af3262010-09-23 10:22:24 -07002784 struct sta_info *sta, *tmp, *prev_sta;
Zhu Yie3cf8b32010-03-29 17:35:07 +08002785 int err = 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02002786
Zhu Yie3cf8b32010-03-29 17:35:07 +08002787 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02002788 memset(&rx, 0, sizeof(rx));
2789 rx.skb = skb;
2790 rx.local = local;
Johannes Berg72abd812007-09-17 01:29:22 -04002791
Zhu Yie3cf8b32010-03-29 17:35:07 +08002792 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
Johannes Berg571ecf62007-07-27 15:43:22 +02002793 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02002794
Helmut Schaa142b9f52009-07-23 13:18:01 +02002795 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2796 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
Johannes Berg554891e2010-09-24 12:38:25 +02002797 status->rx_flags |= IEEE80211_RX_IN_SCAN;
Johannes Berg571ecf62007-07-27 15:43:22 +02002798
Zhu Yie3cf8b32010-03-29 17:35:07 +08002799 if (ieee80211_is_mgmt(fc))
2800 err = skb_linearize(skb);
2801 else
2802 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2803
2804 if (err) {
2805 dev_kfree_skb(skb);
2806 return;
2807 }
2808
2809 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg38f37142008-01-29 17:07:43 +01002810 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01002811 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01002812
Zhu Yie3cf8b32010-03-29 17:35:07 +08002813 if (ieee80211_is_data(fc)) {
Ben Greear56af3262010-09-23 10:22:24 -07002814 prev_sta = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02002815
Johannes Bergabe60632009-11-25 17:46:18 +01002816 for_each_sta_info(local, hdr->addr2, sta, tmp) {
Ben Greear56af3262010-09-23 10:22:24 -07002817 if (!prev_sta) {
2818 prev_sta = sta;
2819 continue;
2820 }
2821
2822 rx.sta = prev_sta;
2823 rx.sdata = prev_sta->sdata;
Johannes Berg4406c372010-09-24 11:21:06 +02002824 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Johannes Berg571ecf62007-07-27 15:43:22 +02002825
Ben Greear56af3262010-09-23 10:22:24 -07002826 prev_sta = sta;
Johannes Berg4406c372010-09-24 11:21:06 +02002827 }
Ben Greear56af3262010-09-23 10:22:24 -07002828
2829 if (prev_sta) {
2830 rx.sta = prev_sta;
2831 rx.sdata = prev_sta->sdata;
2832
Johannes Berg4406c372010-09-24 11:21:06 +02002833 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
Ben Greear56af3262010-09-23 10:22:24 -07002834 return;
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05302835 goto out;
Ben Greear56af3262010-09-23 10:22:24 -07002836 }
Johannes Berg4406c372010-09-24 11:21:06 +02002837 }
2838
Johannes Berg4b0dd982010-09-24 11:21:07 +02002839 prev = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02002840
Johannes Berg4b0dd982010-09-24 11:21:07 +02002841 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2842 if (!ieee80211_sdata_running(sdata))
2843 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01002844
Johannes Berg4b0dd982010-09-24 11:21:07 +02002845 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2846 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2847 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01002848
Johannes Berg4b0dd982010-09-24 11:21:07 +02002849 /*
2850 * frame is destined for this interface, but if it's
2851 * not also for the previous one we handle that after
2852 * the loop to avoid copying the SKB once too much
2853 */
Johannes Bergb2e77712007-09-26 15:19:39 +02002854
Johannes Berg4b0dd982010-09-24 11:21:07 +02002855 if (!prev) {
Johannes Berg340e11f2007-07-27 15:43:22 +02002856 prev = sdata;
Johannes Berg4b0dd982010-09-24 11:21:07 +02002857 continue;
Johannes Berg8e6f0032007-07-27 15:43:22 +02002858 }
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002859
Johannes Berg4b0dd982010-09-24 11:21:07 +02002860 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2861 rx.sdata = prev;
2862 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002863
Johannes Berg4b0dd982010-09-24 11:21:07 +02002864 prev = sdata;
2865 }
Johannes Berg4406c372010-09-24 11:21:06 +02002866
Johannes Berg4b0dd982010-09-24 11:21:07 +02002867 if (prev) {
2868 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2869 rx.sdata = prev;
2870
2871 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2872 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002873 }
Johannes Berg4406c372010-09-24 11:21:06 +02002874
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05302875 out:
Johannes Berg4406c372010-09-24 11:21:06 +02002876 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002877}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002878
2879/*
2880 * This is the receive path handler. It is called by a low level driver when an
2881 * 802.11 MPDU is received from the hardware.
2882 */
John W. Linville103bf9f2009-08-20 16:34:15 -04002883void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002884{
2885 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01002886 struct ieee80211_rate *rate = NULL;
2887 struct ieee80211_supported_band *sband;
Johannes Bergf1d58c22009-06-17 13:13:00 +02002888 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg8318d782008-01-24 19:38:38 +01002889
Johannes Bergd20ef632009-10-11 15:10:40 +02002890 WARN_ON_ONCE(softirq_count() == 0);
2891
Johannes Berg77a980d2009-08-24 11:46:30 +02002892 if (WARN_ON(status->band < 0 ||
2893 status->band >= IEEE80211_NUM_BANDS))
2894 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01002895
2896 sband = local->hw.wiphy->bands[status->band];
Johannes Berg77a980d2009-08-24 11:46:30 +02002897 if (WARN_ON(!sband))
2898 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01002899
Johannes Berg89c3a8a2009-07-28 18:10:17 +02002900 /*
2901 * If we're suspending, it is possible although not too likely
2902 * that we'd be receiving frames after having already partially
2903 * quiesced the stack. We can't process such frames then since
2904 * that might, for example, cause stations to be added or other
2905 * driver callbacks be invoked.
2906 */
Johannes Berg77a980d2009-08-24 11:46:30 +02002907 if (unlikely(local->quiescing || local->suspended))
2908 goto drop;
Johannes Berg89c3a8a2009-07-28 18:10:17 +02002909
Johannes Bergea77f122009-08-21 14:44:45 +02002910 /*
2911 * The same happens when we're not even started,
2912 * but that's worth a warning.
2913 */
Johannes Berg77a980d2009-08-24 11:46:30 +02002914 if (WARN_ON(!local->started))
2915 goto drop;
Johannes Bergea77f122009-08-21 14:44:45 +02002916
Johannes Bergfc885182010-07-30 13:23:12 +02002917 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05002918 /*
Johannes Bergfc885182010-07-30 13:23:12 +02002919 * Validate the rate, unless a PLCP error means that
2920 * we probably can't have a valid rate here anyway.
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05002921 */
Johannes Bergfc885182010-07-30 13:23:12 +02002922
2923 if (status->flag & RX_FLAG_HT) {
2924 /*
2925 * rate_idx is MCS index, which can be [0-76]
2926 * as documented on:
2927 *
2928 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2929 *
2930 * Anything else would be some sort of driver or
2931 * hardware error. The driver should catch hardware
2932 * errors.
2933 */
2934 if (WARN((status->rate_idx < 0 ||
2935 status->rate_idx > 76),
2936 "Rate marked as an HT rate but passed "
2937 "status->rate_idx is not "
2938 "an MCS index [0-76]: %d (0x%02x)\n",
2939 status->rate_idx,
2940 status->rate_idx))
2941 goto drop;
2942 } else {
2943 if (WARN_ON(status->rate_idx < 0 ||
2944 status->rate_idx >= sband->n_bitrates))
2945 goto drop;
2946 rate = &sband->bitrates[status->rate_idx];
2947 }
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002948 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002949
Johannes Berg554891e2010-09-24 12:38:25 +02002950 status->rx_flags = 0;
2951
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002952 /*
2953 * key references and virtual interfaces are protected using RCU
2954 * and this requires that we are in a read-side RCU section during
2955 * receive processing
2956 */
2957 rcu_read_lock();
2958
2959 /*
2960 * Frames with failed FCS/PLCP checksum are not returned,
2961 * all other frames are returned without radiotap header
2962 * if it was previously present.
2963 * Also, frames with less than 16 bytes are dropped.
2964 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002965 skb = ieee80211_rx_monitor(local, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002966 if (!skb) {
2967 rcu_read_unlock();
2968 return;
2969 }
2970
Johannes Berge1e54062010-11-30 08:58:45 +01002971 ieee80211_tpt_led_trig_rx(local,
2972 ((struct ieee80211_hdr *)skb->data)->frame_control,
2973 skb->len);
Christian Lamparter071d9ac2010-08-05 01:36:36 +02002974 __ieee80211_rx_handle_packet(hw, skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002975
2976 rcu_read_unlock();
Johannes Berg77a980d2009-08-24 11:46:30 +02002977
2978 return;
2979 drop:
2980 kfree_skb(skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002981}
John W. Linville103bf9f2009-08-20 16:34:15 -04002982EXPORT_SYMBOL(ieee80211_rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02002983
2984/* This is a version of the rx handler that can be called from hard irq
2985 * context. Post the skb on the queue and schedule the tasklet */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002986void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02002987{
2988 struct ieee80211_local *local = hw_to_local(hw);
2989
2990 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2991
Johannes Berg571ecf62007-07-27 15:43:22 +02002992 skb->pkt_type = IEEE80211_RX_MSG;
2993 skb_queue_tail(&local->skb_queue, skb);
2994 tasklet_schedule(&local->tasklet);
2995}
2996EXPORT_SYMBOL(ieee80211_rx_irqsafe);