blob: cd60be8d9aba53a5634b1057e26a83e1c7b62f89 [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>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040019#include <linux/export.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020020#include <net/mac80211.h>
21#include <net/ieee80211_radiotap.h>
Johannes Bergd26ad372012-02-20 11:38:41 +010022#include <asm/unaligned.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020023
24#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020025#include "driver-ops.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040026#include "led.h"
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +010027#include "mesh.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020028#include "wep.h"
29#include "wpa.h"
30#include "tkip.h"
31#include "wme.h"
Johannes Berg1d8d3de2011-12-16 15:28:57 +010032#include "rate.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020033
Johannes Bergb2e77712007-09-26 15:19:39 +020034/*
35 * monitor mode reception
36 *
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
39 */
40static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
Johannes Berg0869aea2009-10-28 10:03:35 +010041 struct sk_buff *skb)
Johannes Bergb2e77712007-09-26 15:19:39 +020042{
Johannes Berg90b9e4462012-11-16 10:09:08 +010043 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
44
Johannes Bergb2e77712007-09-26 15:19:39 +020045 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
46 if (likely(skb->len > FCS_LEN))
Zhu Yie3cf8b32010-03-29 17:35:07 +080047 __pskb_trim(skb, skb->len - FCS_LEN);
Johannes Bergb2e77712007-09-26 15:19:39 +020048 else {
49 /* driver bug */
50 WARN_ON(1);
51 dev_kfree_skb(skb);
Dan Carpenter06247602012-11-27 20:31:19 +030052 return NULL;
Johannes Bergb2e77712007-09-26 15:19:39 +020053 }
54 }
55
Johannes Berg90b9e4462012-11-16 10:09:08 +010056 if (status->vendor_radiotap_len)
57 __pskb_pull(skb, status->vendor_radiotap_len);
58
Johannes Bergb2e77712007-09-26 15:19:39 +020059 return skb;
60}
61
Johannes Berg1df332e2012-10-26 00:09:11 +020062static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len)
Johannes Bergb2e77712007-09-26 15:19:39 +020063{
Johannes Bergf1d58c22009-06-17 13:13:00 +020064 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg605f1a52012-11-22 10:20:58 +010065 struct ieee80211_hdr *hdr;
66
67 hdr = (void *)(skb->data + status->vendor_radiotap_len);
Johannes Bergb2e77712007-09-26 15:19:39 +020068
Johannes Berg4c298672012-07-05 11:34:31 +020069 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
70 RX_FLAG_FAILED_PLCP_CRC |
71 RX_FLAG_AMPDU_IS_ZEROLEN))
Johannes Bergb2e77712007-09-26 15:19:39 +020072 return 1;
Johannes Berg605f1a52012-11-22 10:20:58 +010073 if (unlikely(skb->len < 16 + present_fcs_len +
74 status->vendor_radiotap_len))
Johannes Bergb2e77712007-09-26 15:19:39 +020075 return 1;
Harvey Harrison87228f52008-06-11 14:21:59 -070076 if (ieee80211_is_ctl(hdr->frame_control) &&
77 !ieee80211_is_pspoll(hdr->frame_control) &&
78 !ieee80211_is_back_req(hdr->frame_control))
Johannes Bergb2e77712007-09-26 15:19:39 +020079 return 1;
80 return 0;
81}
82
Bruno Randolf601ae7f2008-05-08 19:22:43 +020083static int
Johannes Berg90b9e4462012-11-16 10:09:08 +010084ieee80211_rx_radiotap_space(struct ieee80211_local *local,
85 struct ieee80211_rx_status *status)
Bruno Randolf601ae7f2008-05-08 19:22:43 +020086{
87 int len;
88
89 /* always present fields */
90 len = sizeof(struct ieee80211_radiotap_header) + 9;
91
Johannes Berg90b9e4462012-11-16 10:09:08 +010092 /* allocate extra bitmap */
93 if (status->vendor_radiotap_len)
94 len += 4;
95
96 if (ieee80211_have_rx_timestamp(status)) {
97 len = ALIGN(len, 8);
Bruno Randolf601ae7f2008-05-08 19:22:43 +020098 len += 8;
Johannes Berg90b9e4462012-11-16 10:09:08 +010099 }
Johannes Berg7fee5372009-01-30 11:13:06 +0100100 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200101 len += 1;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200102
Johannes Berg90b9e4462012-11-16 10:09:08 +0100103 /* padding for RX_FLAGS if necessary */
104 len = ALIGN(len, 2);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200105
Johannes Berg6d744ba2011-01-27 14:13:17 +0100106 if (status->flag & RX_FLAG_HT) /* HT info */
107 len += 3;
108
Johannes Berg4c298672012-07-05 11:34:31 +0200109 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
Johannes Berg90b9e4462012-11-16 10:09:08 +0100110 len = ALIGN(len, 4);
Johannes Berg4c298672012-07-05 11:34:31 +0200111 len += 8;
112 }
113
Johannes Berg51648922012-11-22 23:00:18 +0100114 if (status->flag & RX_FLAG_VHT) {
115 len = ALIGN(len, 2);
116 len += 12;
117 }
118
Johannes Berg90b9e4462012-11-16 10:09:08 +0100119 if (status->vendor_radiotap_len) {
120 if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
121 status->vendor_radiotap_align = 1;
122 /* align standard part of vendor namespace */
123 len = ALIGN(len, 2);
124 /* allocate standard part of vendor namespace */
125 len += 6;
126 /* align vendor-defined part */
127 len = ALIGN(len, status->vendor_radiotap_align);
128 /* vendor-defined part is already in skb */
129 }
130
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200131 return len;
132}
133
Johannes Berg00ea6de2012-09-05 15:54:51 +0200134/*
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200135 * ieee80211_add_rx_radiotap_header - add radiotap header
136 *
137 * add a radiotap header containing all the fields which the hardware provided.
138 */
139static void
140ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
141 struct sk_buff *skb,
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200142 struct ieee80211_rate *rate,
Felix Fietkau973ef212012-04-16 14:56:48 +0200143 int rtap_len, bool has_fcs)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200144{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200145 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200146 struct ieee80211_radiotap_header *rthdr;
147 unsigned char *pos;
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100148 u16 rx_flags = 0;
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800149 int mpdulen;
150
151 mpdulen = skb->len;
152 if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
153 mpdulen += FCS_LEN;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200154
155 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
156 memset(rthdr, 0, rtap_len);
157
158 /* radiotap header, set always present flags */
159 rthdr->it_present =
160 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200161 (1 << IEEE80211_RADIOTAP_CHANNEL) |
162 (1 << IEEE80211_RADIOTAP_ANTENNA) |
163 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
Johannes Berg90b9e4462012-11-16 10:09:08 +0100164 rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200165
Johannes Berg1df332e2012-10-26 00:09:11 +0200166 pos = (unsigned char *)(rthdr + 1);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200167
Johannes Berg90b9e4462012-11-16 10:09:08 +0100168 if (status->vendor_radiotap_len) {
169 rthdr->it_present |=
170 cpu_to_le32(BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE)) |
171 cpu_to_le32(BIT(IEEE80211_RADIOTAP_EXT));
172 put_unaligned_le32(status->vendor_radiotap_bitmap, pos);
173 pos += 4;
174 }
175
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200176 /* the order of the following fields is important */
177
178 /* IEEE80211_RADIOTAP_TSFT */
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800179 if (ieee80211_have_rx_timestamp(status)) {
Johannes Berg90b9e4462012-11-16 10:09:08 +0100180 /* padding */
181 while ((pos - (u8 *)rthdr) & 7)
182 *pos++ = 0;
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800183 put_unaligned_le64(
184 ieee80211_calculate_rx_timestamp(local, status,
185 mpdulen, 0),
186 pos);
Johannes Berg1df332e2012-10-26 00:09:11 +0200187 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200188 pos += 8;
189 }
190
191 /* IEEE80211_RADIOTAP_FLAGS */
Felix Fietkau973ef212012-04-16 14:56:48 +0200192 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200193 *pos |= IEEE80211_RADIOTAP_F_FCS;
Johannes Bergaae89832009-03-13 12:52:10 +0100194 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
195 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
Bruno Randolfb4f28bb2008-07-30 17:19:55 +0200196 if (status->flag & RX_FLAG_SHORTPRE)
197 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200198 pos++;
199
200 /* IEEE80211_RADIOTAP_RATE */
Johannes Berg56146182012-11-09 15:07:02 +0100201 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200202 /*
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100203 * Without rate information don't add it. If we have,
Mohammed Shafi Shajakhan38f37be2011-02-07 10:10:04 +0530204 * MCS information is a separate field in radiotap,
Johannes Berg73b48092011-04-18 17:05:21 +0200205 * added below. The byte here is needed as padding
206 * for the channel though, so initialise it to 0.
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200207 */
208 *pos = 0;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200209 } else {
Jouni Malinenebe6c7b2009-01-10 11:47:33 +0200210 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200211 *pos = rate->bitrate / 5;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200212 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200213 pos++;
214
215 /* IEEE80211_RADIOTAP_CHANNEL */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100216 put_unaligned_le16(status->freq, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200217 pos += 2;
218 if (status->band == IEEE80211_BAND_5GHZ)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100219 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
220 pos);
Johannes Berg56146182012-11-09 15:07:02 +0100221 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
Johannes Berg5f0b7de2009-11-16 13:58:21 +0100222 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
223 pos);
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100224 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100225 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
226 pos);
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100227 else if (rate)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100228 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
229 pos);
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100230 else
231 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200232 pos += 2;
233
234 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
Felix Fietkaufe8431f2012-03-01 18:00:07 +0100235 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
236 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200237 *pos = status->signal;
238 rthdr->it_present |=
239 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
240 pos++;
241 }
242
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200243 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
244
245 /* IEEE80211_RADIOTAP_ANTENNA */
246 *pos = status->antenna;
247 pos++;
248
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200249 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
250
251 /* IEEE80211_RADIOTAP_RX_FLAGS */
252 /* ensure 2 byte alignment for the 2 byte field as required */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100253 if ((pos - (u8 *)rthdr) & 1)
Johannes Berg90b9e4462012-11-16 10:09:08 +0100254 *pos++ = 0;
Johannes Bergaae89832009-03-13 12:52:10 +0100255 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100256 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
257 put_unaligned_le16(rx_flags, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200258 pos += 2;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100259
260 if (status->flag & RX_FLAG_HT) {
261 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
Johannes Bergac55d2f2012-05-10 09:09:10 +0200262 *pos++ = local->hw.radiotap_mcs_details;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100263 *pos = 0;
264 if (status->flag & RX_FLAG_SHORT_GI)
265 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
266 if (status->flag & RX_FLAG_40MHZ)
267 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
Johannes Bergac55d2f2012-05-10 09:09:10 +0200268 if (status->flag & RX_FLAG_HT_GF)
269 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100270 pos++;
271 *pos++ = status->rate_idx;
272 }
Johannes Berg4c298672012-07-05 11:34:31 +0200273
274 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
275 u16 flags = 0;
276
277 /* ensure 4 byte alignment */
278 while ((pos - (u8 *)rthdr) & 3)
279 pos++;
280 rthdr->it_present |=
281 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
282 put_unaligned_le32(status->ampdu_reference, pos);
283 pos += 4;
284 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
285 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
286 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
287 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
288 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
289 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
290 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
291 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
292 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
293 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
294 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
295 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
296 put_unaligned_le16(flags, pos);
297 pos += 2;
298 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
299 *pos++ = status->ampdu_delimiter_crc;
300 else
301 *pos++ = 0;
302 *pos++ = 0;
303 }
Johannes Berg90b9e4462012-11-16 10:09:08 +0100304
Johannes Berg51648922012-11-22 23:00:18 +0100305 if (status->flag & RX_FLAG_VHT) {
306 u16 known = local->hw.radiotap_vht_details;
307
308 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
309 /* known field - how to handle 80+80? */
310 if (status->flag & RX_FLAG_80P80MHZ)
311 known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
312 put_unaligned_le16(known, pos);
313 pos += 2;
314 /* flags */
315 if (status->flag & RX_FLAG_SHORT_GI)
316 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
317 pos++;
318 /* bandwidth */
319 if (status->flag & RX_FLAG_80MHZ)
320 *pos++ = 4;
321 else if (status->flag & RX_FLAG_80P80MHZ)
322 *pos++ = 0; /* marked not known above */
323 else if (status->flag & RX_FLAG_160MHZ)
324 *pos++ = 11;
325 else if (status->flag & RX_FLAG_40MHZ)
326 *pos++ = 1;
327 else /* 20 MHz */
328 *pos++ = 0;
329 /* MCS/NSS */
330 *pos = (status->rate_idx << 4) | status->vht_nss;
331 pos += 4;
332 /* coding field */
333 pos++;
334 /* group ID */
335 pos++;
336 /* partial_aid */
337 pos += 2;
338 }
339
Johannes Berg90b9e4462012-11-16 10:09:08 +0100340 if (status->vendor_radiotap_len) {
341 /* ensure 2 byte alignment for the vendor field as required */
342 if ((pos - (u8 *)rthdr) & 1)
343 *pos++ = 0;
344 *pos++ = status->vendor_radiotap_oui[0];
345 *pos++ = status->vendor_radiotap_oui[1];
346 *pos++ = status->vendor_radiotap_oui[2];
347 *pos++ = status->vendor_radiotap_subns;
348 put_unaligned_le16(status->vendor_radiotap_len, pos);
349 pos += 2;
350 /* align the actual payload as requested */
351 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
352 *pos++ = 0;
353 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200354}
355
Johannes Bergb2e77712007-09-26 15:19:39 +0200356/*
357 * This function copies a received frame to all monitor interfaces and
358 * returns a cleaned-up SKB that no longer includes the FCS nor the
359 * radiotap header the driver might have added.
360 */
361static struct sk_buff *
362ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
Johannes Berg8318d782008-01-24 19:38:38 +0100363 struct ieee80211_rate *rate)
Johannes Bergb2e77712007-09-26 15:19:39 +0200364{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200365 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200366 struct ieee80211_sub_if_data *sdata;
Johannes Berg293702a2012-03-02 13:18:19 +0100367 int needed_headroom;
Johannes Bergb2e77712007-09-26 15:19:39 +0200368 struct sk_buff *skb, *skb2;
369 struct net_device *prev_dev = NULL;
370 int present_fcs_len = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200371
372 /*
373 * First, we may need to make a copy of the skb because
374 * (1) we need to modify it for radiotap (if not present), and
375 * (2) the other RX handlers will modify the skb we got.
376 *
377 * We don't need to, of course, if we aren't going to return
378 * the SKB because it has a bad FCS/PLCP checksum.
379 */
Johannes Berg0869aea2009-10-28 10:03:35 +0100380
Johannes Bergb2e77712007-09-26 15:19:39 +0200381 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
382 present_fcs_len = FCS_LEN;
383
Johannes Berg605f1a52012-11-22 10:20:58 +0100384 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
385 if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
Zhu Yie3cf8b32010-03-29 17:35:07 +0800386 dev_kfree_skb(origskb);
387 return NULL;
388 }
389
Johannes Bergb2e77712007-09-26 15:19:39 +0200390 if (!local->monitors) {
Johannes Berg0869aea2009-10-28 10:03:35 +0100391 if (should_drop_frame(origskb, present_fcs_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200392 dev_kfree_skb(origskb);
393 return NULL;
394 }
395
Johannes Berg0869aea2009-10-28 10:03:35 +0100396 return remove_monitor_info(local, origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200397 }
398
Helmut Schaa751413e2012-12-05 14:36:12 +0100399 /* room for the radiotap header based on driver features */
400 needed_headroom = ieee80211_rx_radiotap_space(local, status);
401
Johannes Berg0869aea2009-10-28 10:03:35 +0100402 if (should_drop_frame(origskb, present_fcs_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200403 /* only need to expand headroom if necessary */
404 skb = origskb;
405 origskb = NULL;
406
407 /*
408 * This shouldn't trigger often because most devices have an
409 * RX header they pull before we get here, and that should
410 * be big enough for our radiotap information. We should
411 * probably export the length to drivers so that we can have
412 * them allocate enough headroom to start with.
413 */
414 if (skb_headroom(skb) < needed_headroom &&
Johannes Bergc49e5ea2007-12-11 21:33:42 +0100415 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200416 dev_kfree_skb(skb);
417 return NULL;
418 }
419 } else {
420 /*
421 * Need to make a copy and possibly remove radiotap header
422 * and FCS from the original.
423 */
424 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
425
Johannes Berg0869aea2009-10-28 10:03:35 +0100426 origskb = remove_monitor_info(local, origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200427
428 if (!skb)
429 return origskb;
430 }
431
Johannes Berg0869aea2009-10-28 10:03:35 +0100432 /* prepend radiotap information */
Felix Fietkau973ef212012-04-16 14:56:48 +0200433 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
434 true);
Johannes Bergb2e77712007-09-26 15:19:39 +0200435
Johannes Bergce3edf6d02007-12-19 01:31:22 +0100436 skb_reset_mac_header(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200437 skb->ip_summed = CHECKSUM_UNNECESSARY;
438 skb->pkt_type = PACKET_OTHERHOST;
439 skb->protocol = htons(ETH_P_802_2);
440
441 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200442 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +0200443 continue;
444
Michael Wu3d30d942008-01-31 19:48:27 +0100445 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
446 continue;
447
Johannes Berg9607e6b2009-12-23 13:15:31 +0100448 if (!ieee80211_sdata_running(sdata))
Johannes Berg47846c92009-11-25 17:46:19 +0100449 continue;
450
Johannes Bergb2e77712007-09-26 15:19:39 +0200451 if (prev_dev) {
452 skb2 = skb_clone(skb, GFP_ATOMIC);
453 if (skb2) {
454 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400455 netif_receive_skb(skb2);
Johannes Bergb2e77712007-09-26 15:19:39 +0200456 }
457 }
458
459 prev_dev = sdata->dev;
460 sdata->dev->stats.rx_packets++;
461 sdata->dev->stats.rx_bytes += skb->len;
462 }
463
464 if (prev_dev) {
465 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400466 netif_receive_skb(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200467 } else
468 dev_kfree_skb(skb);
469
470 return origskb;
471}
472
Johannes Berg5cf121c2008-02-25 16:27:43 +0100473static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200474{
Harvey Harrison238f74a2008-07-02 11:05:34 -0700475 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +0200476 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg9e262972011-07-07 18:45:03 +0200477 int tid, seqno_idx, security_idx;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200478
479 /* does the frame have a qos control field? */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700480 if (ieee80211_is_data_qos(hdr->frame_control)) {
481 u8 *qc = ieee80211_get_qos_ctl(hdr);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200482 /* frame has qos control */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700483 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
Johannes Berg04b7dcf2011-06-22 10:06:59 +0200484 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
Johannes Berg554891e2010-09-24 12:38:25 +0200485 status->rx_flags |= IEEE80211_RX_AMSDU;
Johannes Berg9e262972011-07-07 18:45:03 +0200486
487 seqno_idx = tid;
488 security_idx = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200489 } else {
Johannes Berg1411f9b2008-07-10 10:11:02 +0200490 /*
491 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
492 *
493 * Sequence numbers for management frames, QoS data
494 * frames with a broadcast/multicast address in the
495 * Address 1 field, and all non-QoS data frames sent
496 * by QoS STAs are assigned using an additional single
497 * modulo-4096 counter, [...]
498 *
499 * We also use that counter for non-QoS STAs.
500 */
Johannes Berg5a306f52012-11-14 23:22:21 +0100501 seqno_idx = IEEE80211_NUM_TIDS;
Johannes Berg9e262972011-07-07 18:45:03 +0200502 security_idx = 0;
503 if (ieee80211_is_mgmt(hdr->frame_control))
Johannes Berg5a306f52012-11-14 23:22:21 +0100504 security_idx = IEEE80211_NUM_TIDS;
Johannes Berg9e262972011-07-07 18:45:03 +0200505 tid = 0;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200506 }
Johannes Berg52865dfd2007-07-27 15:43:22 +0200507
Johannes Berg9e262972011-07-07 18:45:03 +0200508 rx->seqno_idx = seqno_idx;
509 rx->security_idx = security_idx;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200510 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
511 * For now, set skb->priority to 0 for other cases. */
512 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100513}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200514
Johannes Bergd1c3a372009-01-07 00:26:10 +0100515/**
516 * DOC: Packet alignment
517 *
518 * Drivers always need to pass packets that are aligned to two-byte boundaries
519 * to the stack.
520 *
521 * Additionally, should, if possible, align the payload data in a way that
522 * guarantees that the contained IP header is aligned to a four-byte
523 * boundary. In the case of regular frames, this simply means aligning the
524 * payload to a four-byte boundary (because either the IP header is directly
525 * contained, or IV/RFC1042 headers that have a length divisible by four are
Kalle Valo59d9cb02009-12-17 13:54:57 +0100526 * in front of it). If the payload data is not properly aligned and the
527 * architecture doesn't support efficient unaligned operations, mac80211
528 * will align the data.
Johannes Bergd1c3a372009-01-07 00:26:10 +0100529 *
530 * With A-MSDU frames, however, the payload data address must yield two modulo
531 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
532 * push the IP header further back to a multiple of four again. Thankfully, the
533 * specs were sane enough this time around to require padding each A-MSDU
534 * subframe to a length that is a multiple of four.
535 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300536 * Padding like Atheros hardware adds which is between the 802.11 header and
Johannes Bergd1c3a372009-01-07 00:26:10 +0100537 * the payload is not supported, the driver is required to move the 802.11
538 * header to be directly in front of the payload in that case.
539 */
540static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
Johannes Berg38f37142008-01-29 17:07:43 +0100541{
Kalle Valo59d9cb02009-12-17 13:54:57 +0100542#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
543 WARN_ONCE((unsigned long)rx->skb->data & 1,
544 "unaligned packet at 0x%p\n", rx->skb->data);
Johannes Bergd1c3a372009-01-07 00:26:10 +0100545#endif
Johannes Berg6e0d1142007-07-27 15:43:22 +0200546}
547
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +0200548
Johannes Berg571ecf62007-07-27 15:43:22 +0200549/* rx handlers */
550
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200551static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
552{
553 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
554
555 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
556 return 0;
557
558 return ieee80211_is_robust_mgmt_frame(hdr);
559}
560
561
562static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
563{
564 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
565
566 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
567 return 0;
568
569 return ieee80211_is_robust_mgmt_frame(hdr);
570}
571
572
573/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
574static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
575{
576 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
577 struct ieee80211_mmie *mmie;
578
Johannes Berg1df332e2012-10-26 00:09:11 +0200579 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200580 return -1;
581
582 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
583 return -1; /* not a robust management frame */
584
585 mmie = (struct ieee80211_mmie *)
586 (skb->data + skb->len - sizeof(*mmie));
587 if (mmie->element_id != WLAN_EID_MMIE ||
588 mmie->length != sizeof(*mmie) - 2)
589 return -1;
590
591 return le16_to_cpu(mmie->key_id);
592}
593
Johannes Berg1df332e2012-10-26 00:09:11 +0200594static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100595{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg47846c92009-11-25 17:46:19 +0100597 char *dev_addr = rx->sdata->vif.addr;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100598
Harvey Harrisona7767f92008-07-02 16:30:51 -0700599 if (ieee80211_is_data(hdr->frame_control)) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700600 if (is_multicast_ether_addr(hdr->addr1)) {
601 if (ieee80211_has_tods(hdr->frame_control) ||
Johannes Berg1df332e2012-10-26 00:09:11 +0200602 !ieee80211_has_fromds(hdr->frame_control))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700603 return RX_DROP_MONITOR;
Joe Perchesb203ca32012-05-08 18:56:52 +0000604 if (ether_addr_equal(hdr->addr3, dev_addr))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700605 return RX_DROP_MONITOR;
606 } else {
607 if (!ieee80211_has_a4(hdr->frame_control))
608 return RX_DROP_MONITOR;
Joe Perchesb203ca32012-05-08 18:56:52 +0000609 if (ether_addr_equal(hdr->addr4, dev_addr))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700610 return RX_DROP_MONITOR;
611 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100612 }
613
614 /* If there is not an established peer link and this is not a peer link
615 * establisment frame, beacon or probe, drop the frame.
616 */
617
Javier Cardona57cf8042011-05-13 10:45:43 -0700618 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100619 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100620
Harvey Harrisona7767f92008-07-02 16:30:51 -0700621 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100622 return RX_DROP_MONITOR;
623
Harvey Harrisona7767f92008-07-02 16:30:51 -0700624 if (ieee80211_is_action(hdr->frame_control)) {
Javier Cardonad3aaec8a2011-05-03 16:57:09 -0700625 u8 category;
Johannes Berg9b395bc2012-10-26 00:36:40 +0200626
627 /* make sure category field is present */
628 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
629 return RX_DROP_MONITOR;
630
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100631 mgmt = (struct ieee80211_mgmt *)hdr;
Javier Cardonad3aaec8a2011-05-03 16:57:09 -0700632 category = mgmt->u.action.category;
633 if (category != WLAN_CATEGORY_MESH_ACTION &&
Johannes Berg1df332e2012-10-26 00:09:11 +0200634 category != WLAN_CATEGORY_SELF_PROTECTED)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100635 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100636 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100637 }
638
Harvey Harrisona7767f92008-07-02 16:30:51 -0700639 if (ieee80211_is_probe_req(hdr->frame_control) ||
640 ieee80211_is_probe_resp(hdr->frame_control) ||
Javier Cardona71839122011-04-07 15:08:31 -0700641 ieee80211_is_beacon(hdr->frame_control) ||
642 ieee80211_is_auth(hdr->frame_control))
Harvey Harrisona7767f92008-07-02 16:30:51 -0700643 return RX_CONTINUE;
644
645 return RX_DROP_MONITOR;
Harvey Harrisona7767f92008-07-02 16:30:51 -0700646 }
647
Johannes Berg902acc72008-02-23 15:17:19 +0100648 return RX_CONTINUE;
649}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100650
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200651static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100652 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000653 int index,
654 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100655{
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100656 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
Christian Lamparter4cfda472010-12-27 23:21:26 +0100657 struct ieee80211_rx_status *status;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100658
Johannes Bergdd318572010-11-29 11:09:16 +0100659 lockdep_assert_held(&tid_agg_rx->reorder_lock);
660
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100661 if (!skb)
662 goto no_frame;
663
Christian Lamparter071d9ac2010-08-05 01:36:36 +0200664 /* release the frame from the reorder ring buffer */
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100665 tid_agg_rx->stored_mpdu_num--;
666 tid_agg_rx->reorder_buf[index] = NULL;
Christian Lamparter4cfda472010-12-27 23:21:26 +0100667 status = IEEE80211_SKB_RXCB(skb);
668 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000669 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100670
671no_frame:
Johannes Berg9a886582013-02-15 19:25:00 +0100672 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100673}
674
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200675static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100676 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000677 u16 head_seq_num,
678 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100679{
680 int index;
681
Johannes Bergdd318572010-11-29 11:09:16 +0100682 lockdep_assert_held(&tid_agg_rx->reorder_lock);
683
Johannes Berg9a886582013-02-15 19:25:00 +0100684 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
685 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
686 tid_agg_rx->ssn) %
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100687 tid_agg_rx->buf_size;
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000688 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
689 frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100690 }
691}
692
693/*
694 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
695 * the skb was added to the buffer longer than this time ago, the earlier
696 * frames that have not yet been received are assumed to be lost and the skb
697 * can be released for processing. This may also release other skb's from the
698 * reorder buffer if there are no additional gaps between the frames.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200699 *
700 * Callers must hold tid_agg_rx->reorder_lock.
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100701 */
702#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
703
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200704static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000705 struct tid_ampdu_rx *tid_agg_rx,
706 struct sk_buff_head *frames)
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200707{
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200708 int index, j;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200709
Johannes Bergdd318572010-11-29 11:09:16 +0100710 lockdep_assert_held(&tid_agg_rx->reorder_lock);
711
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200712 /* release the buffer until next missing frame */
Johannes Berg9a886582013-02-15 19:25:00 +0100713 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
714 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200715 if (!tid_agg_rx->reorder_buf[index] &&
Eliad Peller07ae2df2012-02-01 18:48:09 +0200716 tid_agg_rx->stored_mpdu_num) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200717 /*
718 * No buffers ready to be released, but check whether any
719 * frames in the reorder buffer have timed out.
720 */
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200721 int skipped = 1;
722 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
723 j = (j + 1) % tid_agg_rx->buf_size) {
724 if (!tid_agg_rx->reorder_buf[j]) {
725 skipped++;
726 continue;
727 }
Daniel Halperin499fe9a2011-03-24 16:01:48 -0700728 if (skipped &&
729 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200730 HT_RX_REORDER_BUF_TIMEOUT))
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200731 goto set_release_timer;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200732
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200733 ht_dbg_ratelimited(sdata,
734 "release an RX reorder frame due to timeout on earlier frames\n");
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000735 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
736 frames);
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200737
738 /*
739 * Increment the head seq# also for the skipped slots.
740 */
741 tid_agg_rx->head_seq_num =
Johannes Berg9a886582013-02-15 19:25:00 +0100742 (tid_agg_rx->head_seq_num +
743 skipped) & IEEE80211_SN_MASK;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200744 skipped = 0;
745 }
746 } else while (tid_agg_rx->reorder_buf[index]) {
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000747 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
748 frames);
Johannes Berg9a886582013-02-15 19:25:00 +0100749 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
750 tid_agg_rx->ssn) %
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200751 tid_agg_rx->buf_size;
752 }
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200753
754 if (tid_agg_rx->stored_mpdu_num) {
Johannes Berg9a886582013-02-15 19:25:00 +0100755 j = index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
756 tid_agg_rx->ssn) %
757 tid_agg_rx->buf_size;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200758
759 for (; j != (index - 1) % tid_agg_rx->buf_size;
760 j = (j + 1) % tid_agg_rx->buf_size) {
761 if (tid_agg_rx->reorder_buf[j])
762 break;
763 }
764
765 set_release_timer:
766
767 mod_timer(&tid_agg_rx->reorder_timer,
Christian Lamparter334df732011-04-24 20:41:16 +0200768 tid_agg_rx->reorder_time[j] + 1 +
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200769 HT_RX_REORDER_BUF_TIMEOUT);
770 } else {
771 del_timer(&tid_agg_rx->reorder_timer);
772 }
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200773}
774
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100775/*
776 * As this function belongs to the RX path it must be under
777 * rcu_read_lock protection. It returns false if the frame
778 * can be processed immediately, true if it was consumed.
779 */
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200780static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100781 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000782 struct sk_buff *skb,
783 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100784{
785 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
786 u16 sc = le16_to_cpu(hdr->seq_ctrl);
787 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
788 u16 head_seq_num, buf_size;
789 int index;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200790 bool ret = true;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100791
Johannes Bergdd318572010-11-29 11:09:16 +0100792 spin_lock(&tid_agg_rx->reorder_lock);
793
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100794 buf_size = tid_agg_rx->buf_size;
795 head_seq_num = tid_agg_rx->head_seq_num;
796
797 /* frame with out of date sequence number */
Johannes Berg9a886582013-02-15 19:25:00 +0100798 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100799 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200800 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100801 }
802
803 /*
804 * If frame the sequence number exceeds our buffering window
805 * size release some previous frames to make room for this one.
806 */
Johannes Berg9a886582013-02-15 19:25:00 +0100807 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
808 head_seq_num = ieee80211_sn_inc(
809 ieee80211_sn_sub(mpdu_seq_num, buf_size));
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100810 /* release stored frames up to new head to stack */
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200811 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000812 head_seq_num, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100813 }
814
815 /* Now the new frame is always in the range of the reordering buffer */
816
Johannes Berg9a886582013-02-15 19:25:00 +0100817 index = ieee80211_sn_sub(mpdu_seq_num,
818 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100819
820 /* check if we already stored this frame */
821 if (tid_agg_rx->reorder_buf[index]) {
822 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200823 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100824 }
825
826 /*
827 * If the current MPDU is in the right order and nothing else
828 * is stored we can process it directly, no need to buffer it.
Johannes Bergc835b212011-03-15 23:17:01 +0100829 * If it is first but there's something stored, we may be able
830 * to release frames after this one.
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100831 */
832 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
833 tid_agg_rx->stored_mpdu_num == 0) {
Johannes Berg9a886582013-02-15 19:25:00 +0100834 tid_agg_rx->head_seq_num =
835 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200836 ret = false;
837 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100838 }
839
840 /* put the frame in the reordering buffer */
841 tid_agg_rx->reorder_buf[index] = skb;
842 tid_agg_rx->reorder_time[index] = jiffies;
843 tid_agg_rx->stored_mpdu_num++;
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000844 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100845
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200846 out:
847 spin_unlock(&tid_agg_rx->reorder_lock);
848 return ret;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100849}
850
851/*
852 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
853 * true if the MPDU was buffered, false if it should be processed.
854 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000855static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
856 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100857{
Johannes Berg2569a822009-11-25 17:46:17 +0100858 struct sk_buff *skb = rx->skb;
859 struct ieee80211_local *local = rx->local;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100860 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Thomas Pedersen660c6a42011-11-03 21:11:12 -0700861 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg2569a822009-11-25 17:46:17 +0100862 struct sta_info *sta = rx->sta;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100863 struct tid_ampdu_rx *tid_agg_rx;
864 u16 sc;
Thomas Pedersen6cc00d52011-11-03 21:11:11 -0700865 u8 tid, ack_policy;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100866
Johannes Berg42beb202013-11-20 11:28:27 +0100867 if (!ieee80211_is_data_qos(hdr->frame_control) ||
868 is_multicast_ether_addr(hdr->addr1))
Johannes Berg2569a822009-11-25 17:46:17 +0100869 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100870
871 /*
872 * filter the QoS data rx stream according to
873 * STA/TID and check if this STA/TID is on aggregation
874 */
875
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100876 if (!sta)
Johannes Berg2569a822009-11-25 17:46:17 +0100877 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100878
Thomas Pedersen6cc00d52011-11-03 21:11:11 -0700879 ack_policy = *ieee80211_get_qos_ctl(hdr) &
880 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100881 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
882
Johannes Berga87f7362010-06-10 10:21:38 +0200883 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
884 if (!tid_agg_rx)
885 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100886
887 /* qos null data frames are excluded */
888 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Johannes Berga87f7362010-06-10 10:21:38 +0200889 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100890
Thomas Pedersen6cc00d52011-11-03 21:11:11 -0700891 /* not part of a BA session */
892 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
893 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
894 goto dont_reorder;
895
Thomas Pedersen660c6a42011-11-03 21:11:12 -0700896 /* not actually part of this BA session */
897 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
898 goto dont_reorder;
899
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100900 /* new, potentially un-ordered, ampdu frame - process it */
901
902 /* reset session timer */
903 if (tid_agg_rx->timeout)
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100904 tid_agg_rx->last_rx = jiffies;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100905
906 /* if this mpdu is fragmented - terminate rx aggregation session */
907 sc = le16_to_cpu(hdr->seq_ctrl);
908 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Bergc1475ca2010-06-10 10:21:37 +0200909 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg344eec62010-06-10 10:21:36 +0200910 skb_queue_tail(&rx->sdata->skb_queue, skb);
911 ieee80211_queue_work(&local->hw, &rx->sdata->work);
Johannes Berg2569a822009-11-25 17:46:17 +0100912 return;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100913 }
914
Johannes Berga87f7362010-06-10 10:21:38 +0200915 /*
916 * No locking needed -- we will only ever process one
917 * RX packet at a time, and thus own tid_agg_rx. All
918 * other code manipulating it needs to (and does) make
919 * sure that we cannot get to it any more before doing
920 * anything with it.
921 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000922 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
923 frames))
Johannes Berg2569a822009-11-25 17:46:17 +0100924 return;
925
926 dont_reorder:
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000927 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100928}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100929
Johannes Berg49461622008-06-30 15:10:45 +0200930static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100931ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200932{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700933 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +0200934 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200935
Johannes Bergfd14e262013-07-11 22:33:26 +0200936 /*
937 * Drop duplicate 802.11 retransmissions
938 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
939 */
940 if (rx->skb->len >= 24 && rx->sta &&
941 !ieee80211_is_ctl(hdr->frame_control) &&
942 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
943 !is_multicast_ether_addr(hdr->addr1)) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700944 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
Johannes Berg9e262972011-07-07 18:45:03 +0200945 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
Johannes Berg571ecf62007-07-27 15:43:22 +0200946 hdr->seq_ctrl)) {
Johannes Berg554891e2010-09-24 12:38:25 +0200947 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200948 rx->local->dot11FrameDuplicateCount++;
949 rx->sta->num_duplicates++;
950 }
Felix Fietkaub1f93312011-02-04 19:20:08 +0100951 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200952 } else
Johannes Berg9e262972011-07-07 18:45:03 +0200953 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +0200954 }
955
Johannes Berg571ecf62007-07-27 15:43:22 +0200956 if (unlikely(rx->skb->len < 16)) {
957 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100958 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200959 }
960
Johannes Berg571ecf62007-07-27 15:43:22 +0200961 /* Drop disallowed frame classes based on STA auth/assoc state;
962 * IEEE 802.11, Chap 5.5.
963 *
Johannes Bergccd7b362008-09-11 00:01:56 +0200964 * mac80211 filters only based on association state, i.e. it drops
965 * Class 3 frames from not associated stations. hostapd sends
Johannes Berg571ecf62007-07-27 15:43:22 +0200966 * deauth/disassoc frames when needed. In addition, hostapd is
967 * responsible for filtering on both auth and assoc states.
968 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100969
Johannes Berg902acc72008-02-23 15:17:19 +0100970 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100971 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100972
Harvey Harrisona7767f92008-07-02 16:30:51 -0700973 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
974 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200975 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Bill Jordan1be7fe82010-10-01 11:20:41 -0400976 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200977 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
Johannes Berg7852e362012-01-20 13:55:24 +0100978 /*
979 * accept port control frames from the AP even when it's not
980 * yet marked ASSOC to prevent a race where we don't set the
981 * assoc bit quickly enough before it sends the first frame
982 */
983 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
Guy Eilam2a33bee2011-08-17 15:18:15 +0300984 ieee80211_is_data_present(hdr->frame_control)) {
Johannes Berg6dbda2d2012-10-26 00:41:23 +0200985 unsigned int hdrlen;
986 __be16 ethertype;
Guy Eilam2a33bee2011-08-17 15:18:15 +0300987
Johannes Berg6dbda2d2012-10-26 00:41:23 +0200988 hdrlen = ieee80211_hdrlen(hdr->frame_control);
989
990 if (rx->skb->len < hdrlen + 8)
991 return RX_DROP_MONITOR;
992
993 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
994 if (ethertype == rx->sdata->control_port_protocol)
Guy Eilam2a33bee2011-08-17 15:18:15 +0300995 return RX_CONTINUE;
996 }
Johannes Berg21fc7562011-11-04 11:18:13 +0100997
998 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
999 cfg80211_rx_spurious_frame(rx->sdata->dev,
1000 hdr->addr2,
1001 GFP_ATOMIC))
1002 return RX_DROP_UNUSABLE;
1003
Johannes Berge4c26ad2008-01-31 19:48:21 +01001004 return RX_DROP_MONITOR;
Guy Eilam2a33bee2011-08-17 15:18:15 +03001005 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001006
Johannes Berg9ae54c82008-01-31 19:48:20 +01001007 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +02001008}
1009
1010
Johannes Berg49461622008-06-30 15:10:45 +02001011static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001012ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
Johannes Berg570bd532007-07-27 15:43:22 +02001013{
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01001014 struct sk_buff *skb = rx->skb;
1015 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1016 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg3017b802007-08-28 17:01:53 -04001017 int keyidx;
1018 int hdrlen;
Johannes Berge4c26ad2008-01-31 19:48:21 +01001019 ieee80211_rx_result result = RX_DROP_UNUSABLE;
Johannes Berge31b8212010-10-05 19:39:30 +02001020 struct ieee80211_key *sta_ptk = NULL;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001021 int mmie_keyidx = -1;
Johannes Berg761ab472010-05-28 14:24:19 +02001022 __le16 fc;
Johannes Berg570bd532007-07-27 15:43:22 +02001023
Johannes Berg3017b802007-08-28 17:01:53 -04001024 /*
1025 * Key selection 101
1026 *
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001027 * There are four types of keys:
Johannes Berg3017b802007-08-28 17:01:53 -04001028 * - GTK (group keys)
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001029 * - IGTK (group keys for management frames)
Johannes Berg3017b802007-08-28 17:01:53 -04001030 * - PTK (pairwise keys)
1031 * - STK (station-to-station pairwise keys)
1032 *
1033 * When selecting a key, we have to distinguish between multicast
1034 * (including broadcast) and unicast frames, the latter can only
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001035 * use PTKs and STKs while the former always use GTKs and IGTKs.
1036 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1037 * unicast frames can also use key indices like GTKs. Hence, if we
1038 * don't have a PTK/STK we check the key index for a WEP key.
Johannes Berg3017b802007-08-28 17:01:53 -04001039 *
Johannes Berg8dc06a12007-08-28 17:01:55 -04001040 * Note that in a regular BSS, multicast frames are sent by the
1041 * AP only, associated stations unicast the frame to the AP first
1042 * which then multicasts it on their behalf.
1043 *
Johannes Berg3017b802007-08-28 17:01:53 -04001044 * There is also a slight problem in IBSS mode: GTKs are negotiated
1045 * with each station, that is something we don't currently handle.
Johannes Berg8dc06a12007-08-28 17:01:55 -04001046 * The spec seems to expect that one negotiates the same key with
1047 * every station but there's no such requirement; VLANs could be
1048 * possible.
Johannes Berg3017b802007-08-28 17:01:53 -04001049 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001050
Johannes Berg3017b802007-08-28 17:01:53 -04001051 /*
Johannes Berg1990af82007-09-26 17:53:15 +02001052 * No point in finding a key and decrypting if the frame is neither
Johannes Berg3017b802007-08-28 17:01:53 -04001053 * addressed to us nor a multicast frame.
1054 */
Johannes Berg554891e2010-09-24 12:38:25 +02001055 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001056 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -04001057
Johannes Berg2569a822009-11-25 17:46:17 +01001058 /* start without a key */
1059 rx->key = NULL;
1060
Johannes Bergd4e46a32007-09-14 11:10:24 -04001061 if (rx->sta)
Johannes Berge31b8212010-10-05 19:39:30 +02001062 sta_ptk = rcu_dereference(rx->sta->ptk);
Johannes Bergd4e46a32007-09-14 11:10:24 -04001063
Johannes Berg761ab472010-05-28 14:24:19 +02001064 fc = hdr->frame_control;
1065
1066 if (!ieee80211_has_protected(fc))
Jouni Malinen0c7c10c2009-05-08 12:34:10 +03001067 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1068
Johannes Berge31b8212010-10-05 19:39:30 +02001069 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1070 rx->key = sta_ptk;
Johannes Bergdc1580d2010-08-10 09:46:40 +02001071 if ((status->flag & RX_FLAG_DECRYPTED) &&
1072 (status->flag & RX_FLAG_IV_STRIPPED))
1073 return RX_CONTINUE;
Jouni Malinen0c7c10c2009-05-08 12:34:10 +03001074 /* Skip decryption if the frame is not protected. */
Johannes Berg761ab472010-05-28 14:24:19 +02001075 if (!ieee80211_has_protected(fc))
Jouni Malinen0c7c10c2009-05-08 12:34:10 +03001076 return RX_CONTINUE;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001077 } else if (mmie_keyidx >= 0) {
1078 /* Broadcast/multicast robust management frame / BIP */
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01001079 if ((status->flag & RX_FLAG_DECRYPTED) &&
1080 (status->flag & RX_FLAG_IV_STRIPPED))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001081 return RX_CONTINUE;
1082
1083 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1084 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1085 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
Johannes Berge31b8212010-10-05 19:39:30 +02001086 if (rx->sta)
1087 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1088 if (!rx->key)
1089 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
Johannes Berg761ab472010-05-28 14:24:19 +02001090 } else if (!ieee80211_has_protected(fc)) {
Jouni Malinen0c7c10c2009-05-08 12:34:10 +03001091 /*
1092 * The frame was not protected, so skip decryption. However, we
1093 * need to set rx->key if there is a key that could have been
1094 * used so that the frame may be dropped if encryption would
1095 * have been expected.
1096 */
1097 struct ieee80211_key *key = NULL;
Johannes Berg897bed82010-12-09 19:49:00 +01001098 struct ieee80211_sub_if_data *sdata = rx->sdata;
1099 int i;
1100
Johannes Berg761ab472010-05-28 14:24:19 +02001101 if (ieee80211_is_mgmt(fc) &&
Jouni Malinen0c7c10c2009-05-08 12:34:10 +03001102 is_multicast_ether_addr(hdr->addr1) &&
1103 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1104 rx->key = key;
Johannes Berg897bed82010-12-09 19:49:00 +01001105 else {
1106 if (rx->sta) {
1107 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1108 key = rcu_dereference(rx->sta->gtk[i]);
1109 if (key)
1110 break;
1111 }
1112 }
1113 if (!key) {
1114 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1115 key = rcu_dereference(sdata->keys[i]);
1116 if (key)
1117 break;
1118 }
1119 }
1120 if (key)
1121 rx->key = key;
1122 }
Jouni Malinen0c7c10c2009-05-08 12:34:10 +03001123 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001124 } else {
Zhu Yi39184b12010-04-08 15:35:10 +08001125 u8 keyid;
Johannes Berg3017b802007-08-28 17:01:53 -04001126 /*
1127 * The device doesn't give us the IV so we won't be
1128 * able to look up the key. That's ok though, we
1129 * don't need to decrypt the frame, we just won't
1130 * be able to keep statistics accurate.
1131 * Except for key threshold notifications, should
1132 * we somehow allow the driver to tell us which key
1133 * the hardware used if this flag is set?
1134 */
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01001135 if ((status->flag & RX_FLAG_DECRYPTED) &&
1136 (status->flag & RX_FLAG_IV_STRIPPED))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001137 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001138
Johannes Berg761ab472010-05-28 14:24:19 +02001139 hdrlen = ieee80211_hdrlen(fc);
Johannes Berg571ecf62007-07-27 15:43:22 +02001140
Johannes Berg3017b802007-08-28 17:01:53 -04001141 if (rx->skb->len < 8 + hdrlen)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001142 return RX_DROP_UNUSABLE; /* TODO: count this? */
Johannes Berg571ecf62007-07-27 15:43:22 +02001143
Johannes Berg3017b802007-08-28 17:01:53 -04001144 /*
1145 * no need to call ieee80211_wep_get_keyidx,
1146 * it verifies a bunch of things we've done already
1147 */
Zhu Yi39184b12010-04-08 15:35:10 +08001148 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1149 keyidx = keyid >> 6;
Johannes Berg3017b802007-08-28 17:01:53 -04001150
Johannes Berge31b8212010-10-05 19:39:30 +02001151 /* check per-station GTK first, if multicast packet */
1152 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1153 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
Johannes Berg3017b802007-08-28 17:01:53 -04001154
Johannes Berge31b8212010-10-05 19:39:30 +02001155 /* if not found, try default key */
1156 if (!rx->key) {
1157 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1158
1159 /*
1160 * RSNA-protected unicast frames should always be
1161 * sent with pairwise or station-to-station keys,
1162 * but for WEP we allow using a key index as well.
1163 */
1164 if (rx->key &&
1165 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1166 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1167 !is_multicast_ether_addr(hdr->addr1))
1168 rx->key = NULL;
1169 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001170 }
1171
Johannes Berg3017b802007-08-28 17:01:53 -04001172 if (rx->key) {
Johannes Berg95acac62011-07-12 12:30:59 +02001173 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1174 return RX_DROP_MONITOR;
1175
Johannes Berg571ecf62007-07-27 15:43:22 +02001176 rx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -04001177 /* TODO: add threshold stuff again */
Johannes Berg1990af82007-09-26 17:53:15 +02001178 } else {
Johannes Berge4c26ad2008-01-31 19:48:21 +01001179 return RX_DROP_MONITOR;
Johannes Berg70f08762007-09-26 17:53:14 +02001180 }
1181
Johannes Berg97359d12010-08-10 09:46:38 +02001182 switch (rx->key->conf.cipher) {
1183 case WLAN_CIPHER_SUITE_WEP40:
1184 case WLAN_CIPHER_SUITE_WEP104:
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001185 result = ieee80211_crypto_wep_decrypt(rx);
1186 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001187 case WLAN_CIPHER_SUITE_TKIP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001188 result = ieee80211_crypto_tkip_decrypt(rx);
1189 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001190 case WLAN_CIPHER_SUITE_CCMP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001191 result = ieee80211_crypto_ccmp_decrypt(rx);
1192 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001193 case WLAN_CIPHER_SUITE_AES_CMAC:
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001194 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1195 break;
Johannes Berg3ffc2a92010-08-27 14:26:52 +03001196 default:
1197 /*
1198 * We can reach here only with HW-only algorithms
1199 * but why didn't it decrypt the frame?!
1200 */
1201 return RX_DROP_UNUSABLE;
Johannes Berg70f08762007-09-26 17:53:14 +02001202 }
1203
Johannes Berga8286912012-03-12 13:49:14 +01001204 /* the hdr variable is invalid after the decrypt handlers */
1205
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001206 /* either the frame has been decrypted or will be dropped */
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01001207 status->flag |= RX_FLAG_DECRYPTED;
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001208
1209 return result;
Johannes Berg70f08762007-09-26 17:53:14 +02001210}
1211
Kalle Valo572e0012009-02-10 17:09:31 +02001212static ieee80211_rx_result debug_noinline
1213ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1214{
1215 struct ieee80211_local *local;
1216 struct ieee80211_hdr *hdr;
1217 struct sk_buff *skb;
1218
1219 local = rx->local;
1220 skb = rx->skb;
1221 hdr = (struct ieee80211_hdr *) skb->data;
1222
1223 if (!local->pspolling)
1224 return RX_CONTINUE;
1225
1226 if (!ieee80211_has_fromds(hdr->frame_control))
1227 /* this is not from AP */
1228 return RX_CONTINUE;
1229
1230 if (!ieee80211_is_data(hdr->frame_control))
1231 return RX_CONTINUE;
1232
1233 if (!ieee80211_has_moredata(hdr->frame_control)) {
1234 /* AP has no more frames buffered for us */
1235 local->pspolling = false;
1236 return RX_CONTINUE;
1237 }
1238
1239 /* more data bit is set, let's request a new frame from the AP */
1240 ieee80211_send_pspoll(local, rx->sdata);
1241
1242 return RX_CONTINUE;
1243}
1244
Marco Porschd012a602012-10-10 12:39:50 -07001245static void sta_ps_start(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001246{
Johannes Berg133b8222008-09-16 14:18:59 +02001247 struct ieee80211_sub_if_data *sdata = sta->sdata;
Christian Lamparter4571d3b2008-11-30 00:48:41 +01001248 struct ieee80211_local *local = sdata->local;
Marco Porschd012a602012-10-10 12:39:50 -07001249 struct ps_data *ps;
Joe Perches0795af52007-10-03 17:59:30 -07001250
Marco Porschd012a602012-10-10 12:39:50 -07001251 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1252 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1253 ps = &sdata->bss->ps;
1254 else
1255 return;
1256
1257 atomic_inc(&ps->num_sta_ps);
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001258 set_sta_flag(sta, WLAN_STA_PS_STA);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001259 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1260 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001261 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1262 sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001263}
1264
Marco Porschd012a602012-10-10 12:39:50 -07001265static void sta_ps_end(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001266{
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001267 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1268 sta->sta.addr, sta->sta.aid);
Johannes Berg004c8722008-02-20 11:21:35 +01001269
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001270 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001271 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1272 sta->sta.addr, sta->sta.aid);
Johannes Bergaf818582009-11-06 11:35:50 +01001273 return;
1274 }
1275
1276 ieee80211_sta_ps_deliver_wakeup(sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001277}
1278
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001279int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1280{
1281 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1282 bool in_ps;
1283
1284 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1285
1286 /* Don't let the same PS state be set twice */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001287 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001288 if ((start && in_ps) || (!start && !in_ps))
1289 return -EINVAL;
1290
1291 if (start)
Marco Porschd012a602012-10-10 12:39:50 -07001292 sta_ps_start(sta_inf);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001293 else
Marco Porschd012a602012-10-10 12:39:50 -07001294 sta_ps_end(sta_inf);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001295
1296 return 0;
1297}
1298EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1299
Johannes Berg49461622008-06-30 15:10:45 +02001300static ieee80211_rx_result debug_noinline
Johannes Berg47086fc2011-09-29 16:04:33 +02001301ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1302{
1303 struct ieee80211_sub_if_data *sdata = rx->sdata;
1304 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1305 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1306 int tid, ac;
1307
1308 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1309 return RX_CONTINUE;
1310
1311 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1312 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1313 return RX_CONTINUE;
1314
1315 /*
1316 * The device handles station powersave, so don't do anything about
1317 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1318 * it to mac80211 since they're handled.)
1319 */
1320 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1321 return RX_CONTINUE;
1322
1323 /*
1324 * Don't do anything if the station isn't already asleep. In
1325 * the uAPSD case, the station will probably be marked asleep,
1326 * in the PS-Poll case the station must be confused ...
1327 */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001328 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
Johannes Berg47086fc2011-09-29 16:04:33 +02001329 return RX_CONTINUE;
1330
1331 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001332 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1333 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
Johannes Bergdeeaee192011-09-29 16:04:35 +02001334 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1335 else
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001336 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
Johannes Bergdeeaee192011-09-29 16:04:35 +02001337 }
Johannes Berg47086fc2011-09-29 16:04:33 +02001338
1339 /* Free PS Poll skb here instead of returning RX_DROP that would
1340 * count as an dropped frame. */
1341 dev_kfree_skb(rx->skb);
1342
1343 return RX_QUEUED;
1344 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1345 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1346 ieee80211_has_pm(hdr->frame_control) &&
1347 (ieee80211_is_data_qos(hdr->frame_control) ||
1348 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1349 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1350 ac = ieee802_1d_to_ac[tid & 7];
1351
1352 /*
1353 * If this AC is not trigger-enabled do nothing.
1354 *
1355 * NB: This could/should check a separate bitmap of trigger-
1356 * enabled queues, but for now we only implement uAPSD w/o
1357 * TSPEC changes to the ACs, so they're always the same.
1358 */
1359 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1360 return RX_CONTINUE;
1361
1362 /* if we are in a service period, do nothing */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001363 if (test_sta_flag(rx->sta, WLAN_STA_SP))
Johannes Berg47086fc2011-09-29 16:04:33 +02001364 return RX_CONTINUE;
1365
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001366 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
Johannes Berg47086fc2011-09-29 16:04:33 +02001367 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1368 else
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001369 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
Johannes Berg47086fc2011-09-29 16:04:33 +02001370 }
1371
1372 return RX_CONTINUE;
1373}
1374
1375static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001376ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001377{
1378 struct sta_info *sta = rx->sta;
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01001379 struct sk_buff *skb = rx->skb;
1380 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1381 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001382
1383 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001384 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001385
Johannes Bergb291ba12009-07-10 15:29:03 +02001386 /*
1387 * Update last_rx only for IBSS packets which are for the current
Antonio Quartullie584da5e2012-11-25 23:13:42 +01001388 * BSSID and for station already AUTHORIZED to avoid keeping the
1389 * current IBSS network alive in cases where other STAs start
1390 * using different BSSID. This will also give the station another
1391 * chance to restart the authentication/authorization in case
1392 * something went wrong the first time.
Johannes Bergb291ba12009-07-10 15:29:03 +02001393 */
Johannes Berg05c914f2008-09-11 00:01:58 +02001394 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001395 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +02001396 NL80211_IFTYPE_ADHOC);
Antonio Quartullie584da5e2012-11-25 23:13:42 +01001397 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1398 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001399 sta->last_rx = jiffies;
Felix Fietkau3af63342011-02-27 22:08:01 +01001400 if (ieee80211_is_data(hdr->frame_control)) {
1401 sta->last_rx_rate_idx = status->rate_idx;
1402 sta->last_rx_rate_flag = status->flag;
Johannes Berg56146182012-11-09 15:07:02 +01001403 sta->last_rx_rate_vht_nss = status->vht_nss;
Felix Fietkau3af63342011-02-27 22:08:01 +01001404 }
1405 }
Johannes Bergb291ba12009-07-10 15:29:03 +02001406 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1407 /*
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001408 * Mesh beacons will update last_rx when if they are found to
1409 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +02001410 */
Johannes Bergb291ba12009-07-10 15:29:03 +02001411 sta->last_rx = jiffies;
Felix Fietkau3af63342011-02-27 22:08:01 +01001412 if (ieee80211_is_data(hdr->frame_control)) {
1413 sta->last_rx_rate_idx = status->rate_idx;
1414 sta->last_rx_rate_flag = status->flag;
Johannes Berg56146182012-11-09 15:07:02 +01001415 sta->last_rx_rate_vht_nss = status->vht_nss;
Felix Fietkau3af63342011-02-27 22:08:01 +01001416 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001417 }
1418
Johannes Berg554891e2010-09-24 12:38:25 +02001419 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001420 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001421
Kalle Valo3cf335d2009-03-22 21:57:06 +02001422 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1423 ieee80211_sta_rx_notify(rx->sdata, hdr);
1424
Johannes Berg571ecf62007-07-27 15:43:22 +02001425 sta->rx_fragments++;
1426 sta->rx_bytes += rx->skb->len;
Felix Fietkaufe8431f2012-03-01 18:00:07 +01001427 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1428 sta->last_signal = status->signal;
1429 ewma_add(&sta->avg_signal, -status->signal);
1430 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001431
Johannes Berg72eaa432008-11-26 15:02:58 +01001432 /*
1433 * Change STA power saving mode only at the end of a frame
1434 * exchange sequence.
1435 */
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001436 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1437 !ieee80211_has_morefrags(hdr->frame_control) &&
Christian Lamparter4cfda472010-12-27 23:21:26 +01001438 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001439 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1440 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001441 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
Johannes Berg72eaa432008-11-26 15:02:58 +01001442 /*
1443 * Ignore doze->wake transitions that are
1444 * indicated by non-data frames, the standard
1445 * is unclear here, but for example going to
1446 * PS mode and then scanning would cause a
1447 * doze->wake transition for the probe request,
1448 * and that is clearly undesirable.
1449 */
1450 if (ieee80211_is_data(hdr->frame_control) &&
1451 !ieee80211_has_pm(hdr->frame_control))
Marco Porschd012a602012-10-10 12:39:50 -07001452 sta_ps_end(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001453 } else {
1454 if (ieee80211_has_pm(hdr->frame_control))
Marco Porschd012a602012-10-10 12:39:50 -07001455 sta_ps_start(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001456 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001457 }
1458
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001459 /* mesh power save support */
1460 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1461 ieee80211_mps_rx_h_sta_process(sta, hdr);
1462
Johannes Berg22403de2009-10-30 12:55:03 +01001463 /*
1464 * Drop (qos-)data::nullfunc frames silently, since they
1465 * are used only to control station power saving mode.
1466 */
1467 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1468 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001469 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
Felix Fietkaud5242152010-01-08 18:06:26 +01001470
1471 /*
1472 * If we receive a 4-addr nullfunc frame from a STA
Johannes Berge7f4a942011-11-04 11:18:20 +01001473 * that was not moved to a 4-addr STA vlan yet send
1474 * the event to userspace and for older hostapd drop
1475 * the frame to the monitor interface.
Felix Fietkaud5242152010-01-08 18:06:26 +01001476 */
1477 if (ieee80211_has_a4(hdr->frame_control) &&
1478 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1479 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
Johannes Berge7f4a942011-11-04 11:18:20 +01001480 !rx->sdata->u.vlan.sta))) {
1481 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1482 cfg80211_rx_unexpected_4addr_frame(
1483 rx->sdata->dev, sta->sta.addr,
1484 GFP_ATOMIC);
Felix Fietkaud5242152010-01-08 18:06:26 +01001485 return RX_DROP_MONITOR;
Johannes Berge7f4a942011-11-04 11:18:20 +01001486 }
Johannes Berg22403de2009-10-30 12:55:03 +01001487 /*
1488 * Update counter and free packet here to avoid
1489 * counting this as a dropped packed.
1490 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001491 sta->rx_packets++;
1492 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001493 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001494 }
1495
Johannes Berg9ae54c82008-01-31 19:48:20 +01001496 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001497} /* ieee80211_rx_h_sta_process */
1498
Johannes Berg571ecf62007-07-27 15:43:22 +02001499static inline struct ieee80211_fragment_entry *
1500ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1501 unsigned int frag, unsigned int seq, int rx_queue,
1502 struct sk_buff **skb)
1503{
1504 struct ieee80211_fragment_entry *entry;
Johannes Berg571ecf62007-07-27 15:43:22 +02001505
Johannes Berg571ecf62007-07-27 15:43:22 +02001506 entry = &sdata->fragments[sdata->fragment_next++];
1507 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1508 sdata->fragment_next = 0;
1509
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001510 if (!skb_queue_empty(&entry->skb_list))
Johannes Berg571ecf62007-07-27 15:43:22 +02001511 __skb_queue_purge(&entry->skb_list);
Johannes Berg571ecf62007-07-27 15:43:22 +02001512
1513 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1514 *skb = NULL;
1515 entry->first_frag_time = jiffies;
1516 entry->seq = seq;
1517 entry->rx_queue = rx_queue;
1518 entry->last_frag = frag;
1519 entry->ccmp = 0;
1520 entry->extra_len = 0;
1521
1522 return entry;
1523}
1524
1525static inline struct ieee80211_fragment_entry *
1526ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001527 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +02001528 int rx_queue, struct ieee80211_hdr *hdr)
1529{
1530 struct ieee80211_fragment_entry *entry;
1531 int i, idx;
1532
1533 idx = sdata->fragment_next;
1534 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1535 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +02001536
1537 idx--;
1538 if (idx < 0)
1539 idx = IEEE80211_FRAGMENT_MAX - 1;
1540
1541 entry = &sdata->fragments[idx];
1542 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1543 entry->rx_queue != rx_queue ||
1544 entry->last_frag + 1 != frag)
1545 continue;
1546
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001547 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001548
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001549 /*
1550 * Check ftype and addresses are equal, else check next fragment
1551 */
1552 if (((hdr->frame_control ^ f_hdr->frame_control) &
1553 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Joe Perchesb203ca32012-05-08 18:56:52 +00001554 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1555 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
Johannes Berg571ecf62007-07-27 15:43:22 +02001556 continue;
1557
S.Çağlar Onurab466232008-02-14 17:36:47 +02001558 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001559 __skb_queue_purge(&entry->skb_list);
1560 continue;
1561 }
1562 return entry;
1563 }
1564
1565 return NULL;
1566}
1567
Johannes Berg49461622008-06-30 15:10:45 +02001568static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001569ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001570{
1571 struct ieee80211_hdr *hdr;
1572 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001573 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001574 unsigned int frag, seq;
1575 struct ieee80211_fragment_entry *entry;
1576 struct sk_buff *skb;
Johannes Berg554891e2010-09-24 12:38:25 +02001577 struct ieee80211_rx_status *status;
Johannes Berg571ecf62007-07-27 15:43:22 +02001578
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001579 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001580 fc = hdr->frame_control;
Javier Cardonaf7fbf702012-10-25 11:10:18 -07001581
1582 if (ieee80211_is_ctl(fc))
1583 return RX_CONTINUE;
1584
Johannes Berg571ecf62007-07-27 15:43:22 +02001585 sc = le16_to_cpu(hdr->seq_ctrl);
1586 frag = sc & IEEE80211_SCTL_FRAG;
1587
Johannes Berg2e613ff2014-11-03 13:57:46 +01001588 if (is_multicast_ether_addr(hdr->addr1)) {
1589 rx->local->dot11MulticastReceivedFrameCount++;
Andreas Müller47e60162014-12-12 12:11:11 +01001590 goto out_no_led;
Johannes Berg571ecf62007-07-27 15:43:22 +02001591 }
Johannes Berg2e613ff2014-11-03 13:57:46 +01001592
Andreas Müller47e60162014-12-12 12:11:11 +01001593 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1594 goto out;
1595
Johannes Berg571ecf62007-07-27 15:43:22 +02001596 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1597
Zhu Yie3cf8b32010-03-29 17:35:07 +08001598 if (skb_linearize(rx->skb))
1599 return RX_DROP_UNUSABLE;
1600
Abhijeet Kolekar058897a2010-05-11 11:22:11 -07001601 /*
1602 * skb_linearize() might change the skb->data and
1603 * previously cached variables (in this case, hdr) need to
1604 * be refreshed with the new data.
1605 */
1606 hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001607 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1608
1609 if (frag == 0) {
1610 /* This is the first fragment of a new frame. */
1611 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg9e262972011-07-07 18:45:03 +02001612 rx->seqno_idx, &(rx->skb));
Johannes Berg97359d12010-08-10 09:46:38 +02001613 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
Harvey Harrison358c8d92008-07-15 18:44:13 -07001614 ieee80211_has_protected(fc)) {
Johannes Berg9e262972011-07-07 18:45:03 +02001615 int queue = rx->security_idx;
Johannes Berg571ecf62007-07-27 15:43:22 +02001616 /* Store CCMP PN so that we can verify that the next
1617 * fragment has a sequential PN value. */
1618 entry->ccmp = 1;
1619 memcpy(entry->last_pn,
Jouni Malinen91902522010-06-11 10:27:33 -07001620 rx->key->u.ccmp.rx_pn[queue],
Johannes Berg571ecf62007-07-27 15:43:22 +02001621 CCMP_PN_LEN);
1622 }
Johannes Berg9ae54c82008-01-31 19:48:20 +01001623 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001624 }
1625
1626 /* This is a fragment for a frame that should already be pending in
1627 * fragment cache. Add this fragment to the end of the pending entry.
1628 */
Johannes Berg9e262972011-07-07 18:45:03 +02001629 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1630 rx->seqno_idx, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001631 if (!entry) {
1632 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001633 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001634 }
1635
1636 /* Verify that MPDUs within one MSDU have sequential PN values.
1637 * (IEEE 802.11i, 8.3.3.4.5) */
1638 if (entry->ccmp) {
1639 int i;
1640 u8 pn[CCMP_PN_LEN], *rpn;
Jouni Malinen91902522010-06-11 10:27:33 -07001641 int queue;
Johannes Berg97359d12010-08-10 09:46:38 +02001642 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001643 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001644 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1645 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1646 pn[i]++;
1647 if (pn[i])
1648 break;
1649 }
Johannes Berg9e262972011-07-07 18:45:03 +02001650 queue = rx->security_idx;
Jouni Malinen91902522010-06-11 10:27:33 -07001651 rpn = rx->key->u.ccmp.rx_pn[queue];
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001652 if (memcmp(pn, rpn, CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001653 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001654 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1655 }
1656
Harvey Harrison358c8d92008-07-15 18:44:13 -07001657 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +02001658 __skb_queue_tail(&entry->skb_list, rx->skb);
1659 entry->last_frag = frag;
1660 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001661 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001662 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001663 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001664 }
1665
1666 rx->skb = __skb_dequeue(&entry->skb_list);
1667 if (skb_tailroom(rx->skb) < entry->extra_len) {
1668 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1669 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1670 GFP_ATOMIC))) {
1671 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1672 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001673 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001674 }
1675 }
1676 while ((skb = __skb_dequeue(&entry->skb_list))) {
1677 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1678 dev_kfree_skb(skb);
1679 }
1680
1681 /* Complete frame has been reassembled - process it now */
Johannes Berg554891e2010-09-24 12:38:25 +02001682 status = IEEE80211_SKB_RXCB(rx->skb);
1683 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001684
1685 out:
Andreas Müller47e60162014-12-12 12:11:11 +01001686 ieee80211_led_rx(rx->local);
1687 out_no_led:
Johannes Berg571ecf62007-07-27 15:43:22 +02001688 if (rx->sta)
1689 rx->sta->rx_packets++;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001690 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001691}
1692
Johannes Berg1df332e2012-10-26 00:09:11 +02001693static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001694{
Johannes Berg1df332e2012-10-26 00:09:11 +02001695 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001696 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001697
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001698 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001699}
1700
Johannes Berg1df332e2012-10-26 00:09:11 +02001701static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02001702{
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01001703 struct sk_buff *skb = rx->skb;
1704 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1705
Johannes Berg3017b802007-08-28 17:01:53 -04001706 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001707 * Pass through unencrypted frames if the hardware has
1708 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001709 */
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01001710 if (status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001711 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001712
1713 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001714 if (unlikely(!ieee80211_has_protected(fc) &&
1715 !ieee80211_is_nullfunc(fc) &&
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001716 ieee80211_is_data(fc) &&
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001717 (rx->key || rx->sdata->drop_unencrypted)))
1718 return -EACCES;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001719
1720 return 0;
1721}
1722
Johannes Berg1df332e2012-10-26 00:09:11 +02001723static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001724{
1725 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Jouni Malinene3efca02010-03-28 22:31:15 -07001726 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001727 __le16 fc = hdr->frame_control;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001728
Jouni Malinene3efca02010-03-28 22:31:15 -07001729 /*
1730 * Pass through unencrypted frames if the hardware has
1731 * decrypted them already.
1732 */
1733 if (status->flag & RX_FLAG_DECRYPTED)
1734 return 0;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001735
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001736 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
Jouni Malinend211e902010-03-28 22:29:52 -07001737 if (unlikely(!ieee80211_has_protected(fc) &&
1738 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02001739 rx->key)) {
1740 if (ieee80211_is_deauth(fc))
1741 cfg80211_send_unprot_deauth(rx->sdata->dev,
1742 rx->skb->data,
1743 rx->skb->len);
1744 else if (ieee80211_is_disassoc(fc))
1745 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1746 rx->skb->data,
1747 rx->skb->len);
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001748 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02001749 }
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001750 /* BIP does not use Protected field, so need to check MMIE */
Joe Perchesf64f9e72009-11-29 16:55:45 -08001751 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02001752 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1753 if (ieee80211_is_deauth(fc))
1754 cfg80211_send_unprot_deauth(rx->sdata->dev,
1755 rx->skb->data,
1756 rx->skb->len);
1757 else if (ieee80211_is_disassoc(fc))
1758 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1759 rx->skb->data,
1760 rx->skb->len);
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001761 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02001762 }
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001763 /*
1764 * When using MFP, Action frames are not allowed prior to
1765 * having configured keys.
1766 */
1767 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1768 ieee80211_is_robust_mgmt_frame(
1769 (struct ieee80211_hdr *) rx->skb->data)))
1770 return -EACCES;
1771 }
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001772
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001773 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001774}
1775
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001776static int
Felix Fietkau4114fa22011-04-12 19:15:22 +02001777__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
Johannes Berg571ecf62007-07-27 15:43:22 +02001778{
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01001779 struct ieee80211_sub_if_data *sdata = rx->sdata;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001780 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001781 bool check_port_control = false;
1782 struct ethhdr *ehdr;
1783 int ret;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001784
Felix Fietkau4114fa22011-04-12 19:15:22 +02001785 *port_control = false;
Johannes Berg9bc383d2009-11-19 11:55:19 +01001786 if (ieee80211_has_a4(hdr->frame_control) &&
1787 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001788 return -1;
Johannes Berg9bc383d2009-11-19 11:55:19 +01001789
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001790 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1791 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1792
1793 if (!sdata->u.mgd.use_4addr)
1794 return -1;
1795 else
1796 check_port_control = true;
1797 }
1798
Johannes Berg9bc383d2009-11-19 11:55:19 +01001799 if (is_multicast_ether_addr(hdr->addr1) &&
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001800 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001801 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001802
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001803 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
Felix Fietkau4114fa22011-04-12 19:15:22 +02001804 if (ret < 0)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001805 return ret;
1806
1807 ehdr = (struct ethhdr *) rx->skb->data;
Felix Fietkau4114fa22011-04-12 19:15:22 +02001808 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1809 *port_control = true;
1810 else if (check_port_control)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001811 return -1;
1812
1813 return 0;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001814}
Johannes Berg571ecf62007-07-27 15:43:22 +02001815
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001816/*
1817 * requires that rx->skb is a frame with ethernet header
1818 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001819static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001820{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301821 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001822 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1823 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1824
1825 /*
1826 * Allow EAPOL frames to us/the PAE group address regardless
1827 * of whether the frame was encrypted or not.
1828 */
Johannes Berga621fa42010-08-27 14:26:54 +03001829 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
Joe Perches3bc79452012-05-08 18:56:53 +00001830 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1831 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001832 return true;
1833
1834 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07001835 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001836 return false;
1837
1838 return true;
1839}
1840
1841/*
1842 * requires that rx->skb is a frame with ethernet header
1843 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001844static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01001845ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001846{
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01001847 struct ieee80211_sub_if_data *sdata = rx->sdata;
1848 struct net_device *dev = sdata->dev;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001849 struct sk_buff *skb, *xmit_skb;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001850 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1851 struct sta_info *dsta;
Johannes Berg554891e2010-09-24 12:38:25 +02001852 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001853
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001854 skb = rx->skb;
1855 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001856
Johannes Berg05c914f2008-09-11 00:01:58 +02001857 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1858 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02001859 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg554891e2010-09-24 12:38:25 +02001860 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
Johannes Berg9bc383d2009-11-19 11:55:19 +01001861 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001862 if (is_multicast_ether_addr(ehdr->h_dest)) {
1863 /*
1864 * send multicast frames both to higher layers in
1865 * local net stack and back to the wireless medium
1866 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001867 xmit_skb = skb_copy(skb, GFP_ATOMIC);
Joe Perchese87cc472012-05-13 21:56:26 +00001868 if (!xmit_skb)
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001869 net_info_ratelimited("%s: failed to clone multicast frame\n",
Joe Perchese87cc472012-05-13 21:56:26 +00001870 dev->name);
Johannes Berg571ecf62007-07-27 15:43:22 +02001871 } else {
Johannes Bergabe60632009-11-25 17:46:18 +01001872 dsta = sta_info_get(sdata, skb->data);
1873 if (dsta) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001874 /*
1875 * The destination station is associated to
1876 * this AP (in this VLAN), so send the frame
1877 * directly to it and do not pass it to local
1878 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02001879 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001880 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001881 skb = NULL;
1882 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001883 }
1884 }
1885
1886 if (skb) {
Johannes Bergd1c3a372009-01-07 00:26:10 +01001887 int align __maybe_unused;
1888
Kalle Valo59d9cb02009-12-17 13:54:57 +01001889#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
Johannes Bergd1c3a372009-01-07 00:26:10 +01001890 /*
1891 * 'align' will only take the values 0 or 2 here
1892 * since all frames are required to be aligned
1893 * to 2-byte boundaries when being passed to
Johannes Berg191922c2013-02-20 21:44:12 +01001894 * mac80211; the code here works just as well if
1895 * that isn't true, but mac80211 assumes it can
1896 * access fields as 2-byte aligned (e.g. for
1897 * compare_ether_addr)
Johannes Bergd1c3a372009-01-07 00:26:10 +01001898 */
matthieu castetdacb6f12009-06-04 22:16:18 +02001899 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01001900 if (align) {
1901 if (WARN_ON(skb_headroom(skb) < 3)) {
1902 dev_kfree_skb(skb);
1903 skb = NULL;
1904 } else {
1905 u8 *data = skb->data;
Zhu Yi8ce0b582009-10-28 13:13:52 -07001906 size_t len = skb_headlen(skb);
1907 skb->data -= align;
1908 memmove(skb->data, data, len);
1909 skb_set_tail_pointer(skb, len);
Johannes Bergd1c3a372009-01-07 00:26:10 +01001910 }
1911 }
1912#endif
1913
1914 if (skb) {
1915 /* deliver to local stack */
1916 skb->protocol = eth_type_trans(skb, dev);
1917 memset(skb->cb, 0, sizeof(skb->cb));
John W. Linville5548a8a2010-06-24 14:25:56 -04001918 netif_receive_skb(skb);
Johannes Bergd1c3a372009-01-07 00:26:10 +01001919 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001920 }
1921
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001922 if (xmit_skb) {
Helmut Schaaaef6c922011-12-21 09:11:35 +01001923 /*
1924 * Send to wireless media and increase priority by 256 to
1925 * keep the received priority instead of reclassifying
1926 * the frame (see cfg80211_classify8021d).
1927 */
1928 xmit_skb->priority += 256;
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09001929 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001930 skb_reset_network_header(xmit_skb);
1931 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001932 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001933 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001934}
1935
Johannes Berg49461622008-06-30 15:10:45 +02001936static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001937ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001938{
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01001939 struct net_device *dev = rx->sdata->dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001940 struct sk_buff *skb = rx->skb;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001941 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1942 __le16 fc = hdr->frame_control;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001943 struct sk_buff_head frame_list;
Johannes Berg554891e2010-09-24 12:38:25 +02001944 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001945
Harvey Harrison358c8d92008-07-15 18:44:13 -07001946 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001947 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001948
Harvey Harrison358c8d92008-07-15 18:44:13 -07001949 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001950 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001951
Johannes Berg554891e2010-09-24 12:38:25 +02001952 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001953 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001954
Zhu Yieaf85ca2009-12-01 10:18:37 +08001955 if (ieee80211_has_a4(hdr->frame_control) &&
1956 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1957 !rx->sdata->u.vlan.sta)
1958 return RX_DROP_UNUSABLE;
1959
1960 if (is_multicast_ether_addr(hdr->addr1) &&
1961 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1962 rx->sdata->u.vlan.sta) ||
1963 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1964 rx->sdata->u.mgd.use_4addr)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001965 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001966
1967 skb->dev = dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001968 __skb_queue_head_init(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001969
Zhu Yie3cf8b32010-03-29 17:35:07 +08001970 if (skb_linearize(skb))
1971 return RX_DROP_UNUSABLE;
1972
Zhu Yieaf85ca2009-12-01 10:18:37 +08001973 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1974 rx->sdata->vif.type,
Yogesh Ashok Powar8b3beca2011-05-13 11:22:31 -07001975 rx->local->hw.extra_tx_headroom, true);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001976
Zhu Yieaf85ca2009-12-01 10:18:37 +08001977 while (!skb_queue_empty(&frame_list)) {
1978 rx->skb = __skb_dequeue(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001979
Harvey Harrison358c8d92008-07-15 18:44:13 -07001980 if (!ieee80211_frame_allowed(rx, fc)) {
Zhu Yieaf85ca2009-12-01 10:18:37 +08001981 dev_kfree_skb(rx->skb);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001982 continue;
1983 }
Zhu Yieaf85ca2009-12-01 10:18:37 +08001984 dev->stats.rx_packets++;
1985 dev->stats.rx_bytes += rx->skb->len;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001986
1987 ieee80211_deliver_skb(rx);
1988 }
1989
Johannes Berg9ae54c82008-01-31 19:48:20 +01001990 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001991}
1992
Ingo Molnarbf94e172008-10-12 23:51:38 -07001993#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02001994static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001995ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1996{
Thomas Pedersen30789eb2011-11-24 17:15:26 -08001997 struct ieee80211_hdr *fwd_hdr, *hdr;
1998 struct ieee80211_tx_info *info;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001999 struct ieee80211s_hdr *mesh_hdr;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002000 struct sk_buff *skb = rx->skb, *fwd_skb;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002001 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01002002 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02002003 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002004 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Thomas Pedersen0cfda852011-11-24 17:15:25 -08002005 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002006 u16 q, hdrlen;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002007
2008 hdr = (struct ieee80211_hdr *) skb->data;
2009 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg9b395bc2012-10-26 00:36:40 +02002010
2011 /* make sure fixed part of mesh header is there, also checks skb len */
2012 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2013 return RX_DROP_MONITOR;
2014
2015 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2016
2017 /* make sure full mesh header is there, also checks skb len */
2018 if (!pskb_may_pull(rx->skb,
2019 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2020 return RX_DROP_MONITOR;
2021
2022 /* reload pointers */
2023 hdr = (struct ieee80211_hdr *) skb->data;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002024 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2025
Bob Copeland58aef0a2015-03-02 14:28:52 -05002026 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2027 return RX_DROP_MONITOR;
2028
Thomas Pedersen2157fdd2011-09-01 12:32:14 -07002029 /* frame is in RMC, don't forward */
2030 if (ieee80211_is_data(hdr->frame_control) &&
2031 is_multicast_ether_addr(hdr->addr1) &&
Johannes Bergbf7cd942013-02-15 14:40:31 +01002032 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
Thomas Pedersen2157fdd2011-09-01 12:32:14 -07002033 return RX_DROP_MONITOR;
2034
Javier Cardona555cb712012-10-24 12:43:30 -07002035 if (!ieee80211_is_data(hdr->frame_control) ||
2036 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002037 return RX_CONTINUE;
2038
2039 if (!mesh_hdr->ttl)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002040 return RX_DROP_MONITOR;
2041
Javier Cardona43b7b312009-10-15 18:10:51 -07002042 if (mesh_hdr->flags & MESH_FLAGS_AE) {
YanBo79617de2008-09-22 13:30:32 +08002043 struct mesh_path *mppath;
Javier Cardona43b7b312009-10-15 18:10:51 -07002044 char *proxied_addr;
2045 char *mpp_addr;
2046
2047 if (is_multicast_ether_addr(hdr->addr1)) {
2048 mpp_addr = hdr->addr3;
2049 proxied_addr = mesh_hdr->eaddr1;
Johannes Berg9b395bc2012-10-26 00:36:40 +02002050 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2051 /* has_a4 already checked in ieee80211_rx_mesh_check */
Javier Cardona43b7b312009-10-15 18:10:51 -07002052 mpp_addr = hdr->addr4;
2053 proxied_addr = mesh_hdr->eaddr2;
Johannes Berg9b395bc2012-10-26 00:36:40 +02002054 } else {
2055 return RX_DROP_MONITOR;
Javier Cardona43b7b312009-10-15 18:10:51 -07002056 }
YanBo79617de2008-09-22 13:30:32 +08002057
YanBo79617de2008-09-22 13:30:32 +08002058 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +01002059 mppath = mpp_path_lookup(sdata, proxied_addr);
YanBo79617de2008-09-22 13:30:32 +08002060 if (!mppath) {
Johannes Bergbf7cd942013-02-15 14:40:31 +01002061 mpp_path_add(sdata, proxied_addr, mpp_addr);
YanBo79617de2008-09-22 13:30:32 +08002062 } else {
2063 spin_lock_bh(&mppath->state_lock);
Joe Perchesb203ca32012-05-08 18:56:52 +00002064 if (!ether_addr_equal(mppath->mpp, mpp_addr))
Javier Cardona43b7b312009-10-15 18:10:51 -07002065 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
YanBo79617de2008-09-22 13:30:32 +08002066 spin_unlock_bh(&mppath->state_lock);
2067 }
2068 rcu_read_unlock();
2069 }
2070
Javier Cardona3c5772a2009-08-10 12:15:48 -07002071 /* Frame has reached destination. Don't forward */
2072 if (!is_multicast_ether_addr(hdr->addr1) &&
Joe Perchesb203ca32012-05-08 18:56:52 +00002073 ether_addr_equal(sdata->vif.addr, hdr->addr3))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002074 return RX_CONTINUE;
2075
Yoni Divinsky00e96de2012-06-20 15:39:13 +03002076 q = ieee80211_select_queue_80211(sdata, skb, hdr);
Thomas Pedersend3c15972011-11-24 17:15:23 -08002077 if (ieee80211_queue_stopped(&local->hw, q)) {
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002078 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
Thomas Pedersend3c15972011-11-24 17:15:23 -08002079 return RX_DROP_MONITOR;
2080 }
2081 skb_set_queue_mapping(skb, q);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002082
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002083 if (!--mesh_hdr->ttl) {
2084 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
Javier Cardona2ac64cd2012-10-24 12:43:31 -07002085 goto out;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002086 }
2087
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +08002088 if (!ifmsh->mshcfg.dot11MeshForwarding)
2089 goto out;
2090
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002091 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2092 if (!fwd_skb) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02002093 net_info_ratelimited("%s: failed to clone mesh frame\n",
Joe Perchese87cc472012-05-13 21:56:26 +00002094 sdata->name);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002095 goto out;
2096 }
2097
2098 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
Thomas Pedersen9d6d6f42013-04-08 11:06:12 -07002099 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002100 info = IEEE80211_SKB_CB(fwd_skb);
2101 memset(info, 0, sizeof(*info));
2102 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2103 info->control.vif = &rx->sdata->vif;
2104 info->control.jiffies = jiffies;
2105 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2106 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2107 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
Marco Porsch3f52b7e2013-01-30 18:14:08 +01002108 /* update power mode indication when forwarding */
2109 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
Johannes Bergbf7cd942013-02-15 14:40:31 +01002110 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
Marco Porsch3f52b7e2013-01-30 18:14:08 +01002111 /* mesh power mode flags updated in mesh_nexthop_lookup */
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002112 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2113 } else {
2114 /* unable to resolve next hop */
Johannes Bergbf7cd942013-02-15 14:40:31 +01002115 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2116 fwd_hdr->addr3, 0, reason, fwd_hdr->addr2);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002117 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
Jesper Juhl74b8cc32012-01-14 21:52:17 +01002118 kfree_skb(fwd_skb);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002119 return RX_DROP_MONITOR;
2120 }
2121
2122 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2123 ieee80211_add_pending_skb(local, fwd_skb);
Johannes Bergb51aff02010-12-22 10:15:07 +01002124 out:
Javier Cardona3c5772a2009-08-10 12:15:48 -07002125 if (is_multicast_ether_addr(hdr->addr1) ||
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01002126 sdata->dev->flags & IFF_PROMISC)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002127 return RX_CONTINUE;
2128 else
2129 return RX_DROP_MONITOR;
2130}
Ingo Molnarbf94e172008-10-12 23:51:38 -07002131#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002132
2133static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002134ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002135{
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01002136 struct ieee80211_sub_if_data *sdata = rx->sdata;
Vivek Natarajane15276a2010-02-08 17:47:01 +05302137 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01002138 struct net_device *dev = sdata->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07002139 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2140 __le16 fc = hdr->frame_control;
Felix Fietkau4114fa22011-04-12 19:15:22 +02002141 bool port_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002142 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002143
Harvey Harrison358c8d92008-07-15 18:44:13 -07002144 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002145 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002146
Harvey Harrison358c8d92008-07-15 18:44:13 -07002147 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002148 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002149
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002150 /*
Johannes Berge7f4a942011-11-04 11:18:20 +01002151 * Send unexpected-4addr-frame event to hostapd. For older versions,
2152 * also drop the frame to cooked monitor interfaces.
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002153 */
2154 if (ieee80211_has_a4(hdr->frame_control) &&
Johannes Berge7f4a942011-11-04 11:18:20 +01002155 sdata->vif.type == NL80211_IFTYPE_AP) {
2156 if (rx->sta &&
2157 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2158 cfg80211_rx_unexpected_4addr_frame(
2159 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002160 return RX_DROP_MONITOR;
Johannes Berge7f4a942011-11-04 11:18:20 +01002161 }
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002162
Felix Fietkau4114fa22011-04-12 19:15:22 +02002163 err = __ieee80211_data_to_8023(rx, &port_control);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002164 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002165 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002166
Harvey Harrison358c8d92008-07-15 18:44:13 -07002167 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002168 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002169
Felix Fietkau4114fa22011-04-12 19:15:22 +02002170 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2171 unlikely(port_control) && sdata->bss) {
2172 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2173 u.ap);
2174 dev = sdata->dev;
2175 rx->sdata = sdata;
2176 }
2177
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002178 rx->skb->dev = dev;
2179
2180 dev->stats.rx_packets++;
2181 dev->stats.rx_bytes += rx->skb->len;
2182
Helmut Schaa08ca9442010-11-30 12:19:34 +01002183 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
Rajkumar Manoharan8c99f692011-02-02 22:57:53 +05302184 !is_multicast_ether_addr(
2185 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2186 (!local->scanning &&
2187 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
Vivek Natarajane15276a2010-02-08 17:47:01 +05302188 mod_timer(&local->dynamic_ps_timer, jiffies +
2189 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2190 }
2191
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002192 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02002193
Johannes Berg9ae54c82008-01-31 19:48:20 +01002194 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002195}
2196
Johannes Berg49461622008-06-30 15:10:45 +02002197static ieee80211_rx_result debug_noinline
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002198ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
Ron Rindjunsky71364712007-12-25 17:00:36 +02002199{
Ron Rindjunsky71364712007-12-25 17:00:36 +02002200 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002201 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002202 struct tid_ampdu_rx *tid_agg_rx;
2203 u16 start_seq_num;
2204 u16 tid;
2205
Harvey Harrisona7767f92008-07-02 16:30:51 -07002206 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002207 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002208
Harvey Harrisona7767f92008-07-02 16:30:51 -07002209 if (ieee80211_is_back_req(bar->frame_control)) {
Johannes Berg8ae59772010-05-30 14:52:58 +02002210 struct {
2211 __le16 control, start_seq_num;
2212 } __packed bar_data;
2213
Ron Rindjunsky71364712007-12-25 17:00:36 +02002214 if (!rx->sta)
Johannes Berga02ae752009-11-16 12:00:40 +01002215 return RX_DROP_MONITOR;
Johannes Berg8ae59772010-05-30 14:52:58 +02002216
2217 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2218 &bar_data, sizeof(bar_data)))
2219 return RX_DROP_MONITOR;
2220
Johannes Berg8ae59772010-05-30 14:52:58 +02002221 tid = le16_to_cpu(bar_data.control) >> 12;
Johannes Berga87f7362010-06-10 10:21:38 +02002222
2223 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2224 if (!tid_agg_rx)
Johannes Berga02ae752009-11-16 12:00:40 +01002225 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002226
Johannes Berg8ae59772010-05-30 14:52:58 +02002227 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002228
2229 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01002230 if (tid_agg_rx->timeout)
2231 mod_timer(&tid_agg_rx->session_timer,
2232 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02002233
Johannes Bergdd318572010-11-29 11:09:16 +01002234 spin_lock(&tid_agg_rx->reorder_lock);
Johannes Berga02ae752009-11-16 12:00:40 +01002235 /* release stored frames up to start of BAR */
Johannes Bergd3b2fb52012-06-22 12:48:38 +02002236 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002237 start_seq_num, frames);
Johannes Bergdd318572010-11-29 11:09:16 +01002238 spin_unlock(&tid_agg_rx->reorder_lock);
2239
Johannes Berga02ae752009-11-16 12:00:40 +01002240 kfree_skb(skb);
2241 return RX_QUEUED;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002242 }
2243
Johannes Berg08daeca2010-05-30 14:53:43 +02002244 /*
2245 * After this point, we only want management frames,
2246 * so we can drop all remaining control frames to
2247 * cooked monitor interfaces.
2248 */
2249 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002250}
2251
Jouni Malinenf4f727a2009-01-10 11:46:53 +02002252static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2253 struct ieee80211_mgmt *mgmt,
2254 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02002255{
2256 struct ieee80211_local *local = sdata->local;
2257 struct sk_buff *skb;
2258 struct ieee80211_mgmt *resp;
2259
Joe Perchesb203ca32012-05-08 18:56:52 +00002260 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
Jouni Malinenfea14732009-01-08 13:32:06 +02002261 /* Not to own unicast address */
2262 return;
2263 }
2264
Joe Perchesb203ca32012-05-08 18:56:52 +00002265 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2266 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
Johannes Berg77fdaa12009-07-07 03:45:17 +02002267 /* Not from the current AP or not associated yet. */
Jouni Malinenfea14732009-01-08 13:32:06 +02002268 return;
2269 }
2270
2271 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2272 /* Too short SA Query request frame */
2273 return;
2274 }
2275
2276 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2277 if (skb == NULL)
2278 return;
2279
2280 skb_reserve(skb, local->hw.extra_tx_headroom);
2281 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2282 memset(resp, 0, 24);
2283 memcpy(resp->da, mgmt->sa, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01002284 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01002285 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02002286 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2287 IEEE80211_STYPE_ACTION);
2288 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2289 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2290 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2291 memcpy(resp->u.action.u.sa_query.trans_id,
2292 mgmt->u.action.u.sa_query.trans_id,
2293 WLAN_SA_QUERY_TR_ID_LEN);
2294
Johannes Berg62ae67b2009-11-18 18:42:05 +01002295 ieee80211_tx_skb(sdata, skb);
Jouni Malinenfea14732009-01-08 13:32:06 +02002296}
2297
Johannes Berg49461622008-06-30 15:10:45 +02002298static ieee80211_rx_result debug_noinline
Johannes Berg2e161f72010-08-12 15:38:38 +02002299ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2300{
2301 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002302 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002303
2304 /*
2305 * From here on, look only at management frames.
2306 * Data and control frames are already handled,
2307 * and unknown (reserved) frames are useless.
2308 */
2309 if (rx->skb->len < 24)
2310 return RX_DROP_MONITOR;
2311
2312 if (!ieee80211_is_mgmt(mgmt->frame_control))
2313 return RX_DROP_MONITOR;
2314
Johannes Bergee971922011-11-04 11:18:18 +01002315 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2316 ieee80211_is_beacon(mgmt->frame_control) &&
2317 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
Johannes Berg804483e2012-03-05 22:18:41 +01002318 int sig = 0;
2319
2320 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2321 sig = status->signal;
2322
Johannes Bergee971922011-11-04 11:18:18 +01002323 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2324 rx->skb->data, rx->skb->len,
Ben Greear37c73b52012-10-26 14:49:25 -07002325 status->freq, sig);
Johannes Bergee971922011-11-04 11:18:18 +01002326 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2327 }
2328
Johannes Berg554891e2010-09-24 12:38:25 +02002329 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg2e161f72010-08-12 15:38:38 +02002330 return RX_DROP_MONITOR;
2331
2332 if (ieee80211_drop_unencrypted_mgmt(rx))
2333 return RX_DROP_UNUSABLE;
2334
2335 return RX_CONTINUE;
2336}
2337
2338static ieee80211_rx_result debug_noinline
Johannes Bergde1ede72008-09-09 14:42:50 +02002339ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2340{
2341 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01002342 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergde1ede72008-09-09 14:42:50 +02002343 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002344 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergde1ede72008-09-09 14:42:50 +02002345 int len = rx->skb->len;
2346
2347 if (!ieee80211_is_action(mgmt->frame_control))
2348 return RX_CONTINUE;
2349
Jouni Malinen026331c2010-02-15 12:53:10 +02002350 /* drop too small frames */
2351 if (len < IEEE80211_MIN_ACTION_SIZE)
2352 return RX_DROP_UNUSABLE;
2353
Marco Porsch815b8092012-12-05 15:04:26 -08002354 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2355 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED)
Johannes Berg84040802010-02-15 12:46:39 +02002356 return RX_DROP_UNUSABLE;
Johannes Bergde1ede72008-09-09 14:42:50 +02002357
Johannes Berg554891e2010-09-24 12:38:25 +02002358 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg84040802010-02-15 12:46:39 +02002359 return RX_DROP_UNUSABLE;
Johannes Bergde1ede72008-09-09 14:42:50 +02002360
Johannes Bergde1ede72008-09-09 14:42:50 +02002361 switch (mgmt->u.action.category) {
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002362 case WLAN_CATEGORY_HT:
2363 /* reject HT action frames from stations not supporting HT */
2364 if (!rx->sta->sta.ht_cap.ht_supported)
2365 goto invalid;
2366
2367 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2368 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2369 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2370 sdata->vif.type != NL80211_IFTYPE_AP &&
2371 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2372 break;
2373
Johannes Bergec61cd62012-12-28 12:12:10 +01002374 /* verify action & smps_control/chanwidth are present */
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002375 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2376 goto invalid;
2377
2378 switch (mgmt->u.action.u.ht_smps.action) {
2379 case WLAN_HT_ACTION_SMPS: {
2380 struct ieee80211_supported_band *sband;
Johannes Bergaf0ed692013-02-12 14:21:00 +01002381 enum ieee80211_smps_mode smps_mode;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002382
2383 /* convert to HT capability */
2384 switch (mgmt->u.action.u.ht_smps.smps_control) {
2385 case WLAN_HT_SMPS_CONTROL_DISABLED:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002386 smps_mode = IEEE80211_SMPS_OFF;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002387 break;
2388 case WLAN_HT_SMPS_CONTROL_STATIC:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002389 smps_mode = IEEE80211_SMPS_STATIC;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002390 break;
2391 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002392 smps_mode = IEEE80211_SMPS_DYNAMIC;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002393 break;
2394 default:
2395 goto invalid;
2396 }
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002397
2398 /* if no change do nothing */
Johannes Bergaf0ed692013-02-12 14:21:00 +01002399 if (rx->sta->sta.smps_mode == smps_mode)
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002400 goto handled;
Johannes Bergaf0ed692013-02-12 14:21:00 +01002401 rx->sta->sta.smps_mode = smps_mode;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002402
2403 sband = rx->local->hw.wiphy->bands[status->band];
2404
Johannes Berg64f68e52012-03-28 10:58:37 +02002405 rate_control_rate_update(local, sband, rx->sta,
2406 IEEE80211_RC_SMPS_CHANGED);
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002407 goto handled;
2408 }
Johannes Bergec61cd62012-12-28 12:12:10 +01002409 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2410 struct ieee80211_supported_band *sband;
2411 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002412 enum ieee80211_sta_rx_bandwidth new_bw;
Johannes Bergec61cd62012-12-28 12:12:10 +01002413
2414 /* If it doesn't support 40 MHz it can't change ... */
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002415 if (!(rx->sta->sta.ht_cap.cap &
2416 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
Johannes Bergec61cd62012-12-28 12:12:10 +01002417 goto handled;
2418
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002419 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2420 new_bw = IEEE80211_STA_RX_BW_20;
Johannes Bergec61cd62012-12-28 12:12:10 +01002421 else
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002422 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2423
2424 if (rx->sta->sta.bandwidth == new_bw)
2425 goto handled;
Johannes Bergec61cd62012-12-28 12:12:10 +01002426
2427 sband = rx->local->hw.wiphy->bands[status->band];
2428
2429 rate_control_rate_update(local, sband, rx->sta,
2430 IEEE80211_RC_BW_CHANGED);
2431 goto handled;
2432 }
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002433 default:
2434 goto invalid;
2435 }
2436
2437 break;
Johannes Berg1b3a2e42013-03-26 15:17:18 +01002438 case WLAN_CATEGORY_PUBLIC:
2439 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2440 goto invalid;
2441 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2442 break;
2443 if (!rx->sta)
2444 break;
2445 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2446 break;
2447 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2448 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2449 break;
2450 if (len < offsetof(struct ieee80211_mgmt,
2451 u.action.u.ext_chan_switch.variable))
2452 goto invalid;
2453 goto queue;
Johannes Berg0af83d32012-12-27 18:55:36 +01002454 case WLAN_CATEGORY_VHT:
2455 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2456 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2457 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2458 sdata->vif.type != NL80211_IFTYPE_AP &&
2459 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2460 break;
2461
2462 /* verify action code is present */
2463 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2464 goto invalid;
2465
2466 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2467 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2468 u8 opmode;
2469
2470 /* verify opmode is present */
2471 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2472 goto invalid;
2473
2474 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2475
2476 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
Johannes Bergbee7f582013-02-07 22:24:55 +01002477 opmode, status->band,
2478 false);
Johannes Berg0af83d32012-12-27 18:55:36 +01002479 goto handled;
2480 }
2481 default:
2482 break;
2483 }
2484 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002485 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01002486 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
Thomas Pedersenae2772b2011-10-26 14:47:29 -07002487 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
Johannes Berg8abd3f92009-02-10 21:25:47 +01002488 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
Alexander Simon13c40c52011-11-30 16:56:34 +01002489 sdata->vif.type != NL80211_IFTYPE_AP &&
2490 sdata->vif.type != NL80211_IFTYPE_ADHOC)
Johannes Berg84040802010-02-15 12:46:39 +02002491 break;
Johannes Berg8abd3f92009-02-10 21:25:47 +01002492
Jouni Malinen026331c2010-02-15 12:53:10 +02002493 /* verify action_code is present */
2494 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2495 break;
2496
Johannes Bergde1ede72008-09-09 14:42:50 +02002497 switch (mgmt->u.action.u.addba_req.action_code) {
2498 case WLAN_ACTION_ADDBA_REQ:
2499 if (len < (IEEE80211_MIN_ACTION_SIZE +
2500 sizeof(mgmt->u.action.u.addba_req)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002501 goto invalid;
2502 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002503 case WLAN_ACTION_ADDBA_RESP:
2504 if (len < (IEEE80211_MIN_ACTION_SIZE +
2505 sizeof(mgmt->u.action.u.addba_resp)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002506 goto invalid;
2507 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002508 case WLAN_ACTION_DELBA:
2509 if (len < (IEEE80211_MIN_ACTION_SIZE +
2510 sizeof(mgmt->u.action.u.delba)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002511 goto invalid;
2512 break;
2513 default:
2514 goto invalid;
Johannes Bergde1ede72008-09-09 14:42:50 +02002515 }
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002516
Johannes Berg8b58ff82010-06-10 10:21:51 +02002517 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002518 case WLAN_CATEGORY_SPECTRUM_MGMT:
Johannes Berg4797c7b2012-07-26 14:31:19 +02002519 if (status->band != IEEE80211_BAND_5GHZ)
Johannes Berg84040802010-02-15 12:46:39 +02002520 break;
Johannes Berg46900292009-02-15 12:44:28 +01002521
2522 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002523 break;
Johannes Berg46900292009-02-15 12:44:28 +01002524
Jouni Malinen026331c2010-02-15 12:53:10 +02002525 /* verify action_code is present */
2526 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2527 break;
2528
Johannes Berg39192c02008-09-09 14:49:03 +02002529 switch (mgmt->u.action.u.measurement.action_code) {
2530 case WLAN_ACTION_SPCT_MSR_REQ:
2531 if (len < (IEEE80211_MIN_ACTION_SIZE +
2532 sizeof(mgmt->u.action.u.measurement)))
Johannes Berg84040802010-02-15 12:46:39 +02002533 break;
Johannes Berg39192c02008-09-09 14:49:03 +02002534 ieee80211_process_measurement_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002535 goto handled;
Sujithc481ec92009-01-06 09:28:37 +05302536 case WLAN_ACTION_SPCT_CHL_SWITCH:
Johannes Bergcc32abd2009-05-15 11:52:31 +02002537 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002538 break;
Johannes Bergcc32abd2009-05-15 11:52:31 +02002539
Joe Perchesb203ca32012-05-08 18:56:52 +00002540 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
Johannes Berg84040802010-02-15 12:46:39 +02002541 break;
Sujithc481ec92009-01-06 09:28:37 +05302542
Johannes Berg8b58ff82010-06-10 10:21:51 +02002543 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002544 }
2545 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002546 case WLAN_CATEGORY_SA_QUERY:
2547 if (len < (IEEE80211_MIN_ACTION_SIZE +
2548 sizeof(mgmt->u.action.u.sa_query)))
Johannes Berg84040802010-02-15 12:46:39 +02002549 break;
2550
Jouni Malinenfea14732009-01-08 13:32:06 +02002551 switch (mgmt->u.action.u.sa_query.action) {
2552 case WLAN_ACTION_SA_QUERY_REQUEST:
2553 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002554 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002555 ieee80211_process_sa_query_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002556 goto handled;
Jouni Malinenfea14732009-01-08 13:32:06 +02002557 }
2558 break;
Thomas Pedersen8db09852011-08-12 20:01:00 -07002559 case WLAN_CATEGORY_SELF_PROTECTED:
Johannes Berg9b395bc2012-10-26 00:36:40 +02002560 if (len < (IEEE80211_MIN_ACTION_SIZE +
2561 sizeof(mgmt->u.action.u.self_prot.action_code)))
2562 break;
2563
Thomas Pedersen8db09852011-08-12 20:01:00 -07002564 switch (mgmt->u.action.u.self_prot.action_code) {
2565 case WLAN_SP_MESH_PEERING_OPEN:
2566 case WLAN_SP_MESH_PEERING_CLOSE:
2567 case WLAN_SP_MESH_PEERING_CONFIRM:
2568 if (!ieee80211_vif_is_mesh(&sdata->vif))
2569 goto invalid;
Thomas Pedersena6dad6a2013-03-04 13:06:12 -08002570 if (sdata->u.mesh.user_mpm)
Thomas Pedersen8db09852011-08-12 20:01:00 -07002571 /* userspace handles this frame */
2572 break;
2573 goto queue;
2574 case WLAN_SP_MGK_INFORM:
2575 case WLAN_SP_MGK_ACK:
2576 if (!ieee80211_vif_is_mesh(&sdata->vif))
2577 goto invalid;
2578 break;
2579 }
2580 break;
Javier Cardonad3aaec8a2011-05-03 16:57:09 -07002581 case WLAN_CATEGORY_MESH_ACTION:
Johannes Berg9b395bc2012-10-26 00:36:40 +02002582 if (len < (IEEE80211_MIN_ACTION_SIZE +
2583 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2584 break;
2585
Johannes Berg77a121c2010-06-10 10:21:34 +02002586 if (!ieee80211_vif_is_mesh(&sdata->vif))
2587 break;
Thomas Pedersen25d49e42011-08-11 19:35:15 -07002588 if (mesh_action_is_path_sel(mgmt) &&
Johannes Berg1df332e2012-10-26 00:09:11 +02002589 !mesh_path_sel_is_hwmp(sdata))
Javier Cardonac7108a72010-12-16 17:37:50 -08002590 break;
2591 goto queue;
Johannes Berg84040802010-02-15 12:46:39 +02002592 }
Jouni Malinen026331c2010-02-15 12:53:10 +02002593
Johannes Berg2e161f72010-08-12 15:38:38 +02002594 return RX_CONTINUE;
2595
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002596 invalid:
Johannes Berg554891e2010-09-24 12:38:25 +02002597 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
Johannes Berg2e161f72010-08-12 15:38:38 +02002598 /* will return in the next handlers */
2599 return RX_CONTINUE;
2600
2601 handled:
2602 if (rx->sta)
2603 rx->sta->rx_packets++;
2604 dev_kfree_skb(rx->skb);
2605 return RX_QUEUED;
2606
2607 queue:
2608 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2609 skb_queue_tail(&sdata->skb_queue, rx->skb);
2610 ieee80211_queue_work(&local->hw, &sdata->work);
2611 if (rx->sta)
2612 rx->sta->rx_packets++;
2613 return RX_QUEUED;
2614}
2615
2616static ieee80211_rx_result debug_noinline
2617ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2618{
Johannes Berg554891e2010-09-24 12:38:25 +02002619 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg804483e2012-03-05 22:18:41 +01002620 int sig = 0;
Johannes Berg2e161f72010-08-12 15:38:38 +02002621
2622 /* skip known-bad action frames and return them in the next handler */
Johannes Berg554891e2010-09-24 12:38:25 +02002623 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
Johannes Berg2e161f72010-08-12 15:38:38 +02002624 return RX_CONTINUE;
Felix Fietkaud7907442010-01-07 20:23:53 +01002625
Jouni Malinen026331c2010-02-15 12:53:10 +02002626 /*
2627 * Getting here means the kernel doesn't know how to handle
2628 * it, but maybe userspace does ... include returned frames
2629 * so userspace can register for those to know whether ones
2630 * it transmitted were processed or returned.
2631 */
Jouni Malinen026331c2010-02-15 12:53:10 +02002632
Johannes Berg804483e2012-03-05 22:18:41 +01002633 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2634 sig = status->signal;
2635
Johannes Berg71bbc992012-06-15 15:30:18 +02002636 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
Johannes Berg2e161f72010-08-12 15:38:38 +02002637 rx->skb->data, rx->skb->len,
2638 GFP_ATOMIC)) {
2639 if (rx->sta)
2640 rx->sta->rx_packets++;
2641 dev_kfree_skb(rx->skb);
2642 return RX_QUEUED;
2643 }
2644
Johannes Berg2e161f72010-08-12 15:38:38 +02002645 return RX_CONTINUE;
2646}
2647
2648static ieee80211_rx_result debug_noinline
2649ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2650{
2651 struct ieee80211_local *local = rx->local;
2652 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2653 struct sk_buff *nskb;
2654 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02002655 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002656
2657 if (!ieee80211_is_action(mgmt->frame_control))
2658 return RX_CONTINUE;
2659
2660 /*
2661 * For AP mode, hostapd is responsible for handling any action
2662 * frames that we didn't handle, including returning unknown
2663 * ones. For all other modes we will return them to the sender,
2664 * setting the 0x80 bit in the action category, as required by
Johannes Berg4b5ebcc2012-06-27 15:38:56 +02002665 * 802.11-2012 9.24.4.
Johannes Berg2e161f72010-08-12 15:38:38 +02002666 * Newer versions of hostapd shall also use the management frame
2667 * registration mechanisms, but older ones still use cooked
2668 * monitor interfaces so push all frames there.
2669 */
Johannes Berg554891e2010-09-24 12:38:25 +02002670 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
Johannes Berg2e161f72010-08-12 15:38:38 +02002671 (sdata->vif.type == NL80211_IFTYPE_AP ||
2672 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2673 return RX_DROP_MONITOR;
Jouni Malinen026331c2010-02-15 12:53:10 +02002674
Johannes Berg4b5ebcc2012-06-27 15:38:56 +02002675 if (is_multicast_ether_addr(mgmt->da))
2676 return RX_DROP_MONITOR;
2677
Johannes Berg84040802010-02-15 12:46:39 +02002678 /* do not return rejected action frames */
2679 if (mgmt->u.action.category & 0x80)
2680 return RX_DROP_UNUSABLE;
2681
2682 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2683 GFP_ATOMIC);
2684 if (nskb) {
John W. Linville292b4df2010-06-24 11:13:56 -04002685 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
Johannes Berg84040802010-02-15 12:46:39 +02002686
John W. Linville292b4df2010-06-24 11:13:56 -04002687 nmgmt->u.action.category |= 0x80;
2688 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2689 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
Johannes Berg84040802010-02-15 12:46:39 +02002690
2691 memset(nskb->cb, 0, sizeof(nskb->cb));
2692
Johannes Berg07e5a5f2013-03-07 13:22:05 +01002693 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2694 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2695
2696 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2697 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2698 IEEE80211_TX_CTL_NO_CCK_RATE;
2699 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2700 info->hw_queue =
2701 local->hw.offchannel_tx_hw_queue;
2702 }
2703
2704 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2705 status->band);
Johannes Bergde1ede72008-09-09 14:42:50 +02002706 }
Johannes Berg39192c02008-09-09 14:49:03 +02002707 dev_kfree_skb(rx->skb);
2708 return RX_QUEUED;
Johannes Bergde1ede72008-09-09 14:42:50 +02002709}
2710
2711static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002712ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02002713{
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01002714 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg77a121c2010-06-10 10:21:34 +02002715 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2716 __le16 stype;
Johannes Berg571ecf62007-07-27 15:43:22 +02002717
Johannes Berg77a121c2010-06-10 10:21:34 +02002718 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
Johannes Berg472dbc42008-09-11 00:01:49 +02002719
Johannes Berg77a121c2010-06-10 10:21:34 +02002720 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2721 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2722 sdata->vif.type != NL80211_IFTYPE_STATION)
2723 return RX_DROP_MONITOR;
Johannes Bergf9d540e2007-09-28 14:02:09 +02002724
Johannes Berg77a121c2010-06-10 10:21:34 +02002725 switch (stype) {
Johannes Berg66e67e42012-01-20 13:55:27 +01002726 case cpu_to_le16(IEEE80211_STYPE_AUTH):
Johannes Berg77a121c2010-06-10 10:21:34 +02002727 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2728 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2729 /* process for all: mesh, mlme, ibss */
2730 break;
Johannes Berg66e67e42012-01-20 13:55:27 +01002731 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2732 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
Johannes Berg77a121c2010-06-10 10:21:34 +02002733 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2734 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
Christian Lamparter2c313332010-11-29 20:53:23 +01002735 if (is_multicast_ether_addr(mgmt->da) &&
2736 !is_broadcast_ether_addr(mgmt->da))
2737 return RX_DROP_MONITOR;
2738
Johannes Berg77a121c2010-06-10 10:21:34 +02002739 /* process only for station */
2740 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2741 return RX_DROP_MONITOR;
2742 break;
2743 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08002744 /* process only for ibss and mesh */
2745 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2746 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
Johannes Berg77a121c2010-06-10 10:21:34 +02002747 return RX_DROP_MONITOR;
2748 break;
2749 default:
2750 return RX_DROP_MONITOR;
2751 }
Johannes Berg46900292009-02-15 12:44:28 +01002752
Johannes Berg77a121c2010-06-10 10:21:34 +02002753 /* queue up frame and kick off work to process it */
Johannes Bergc1475ca2010-06-10 10:21:37 +02002754 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg77a121c2010-06-10 10:21:34 +02002755 skb_queue_tail(&sdata->skb_queue, rx->skb);
2756 ieee80211_queue_work(&rx->local->hw, &sdata->work);
Johannes Berg8b58ff82010-06-10 10:21:51 +02002757 if (rx->sta)
2758 rx->sta->rx_packets++;
Johannes Berg77a121c2010-06-10 10:21:34 +02002759
2760 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002761}
2762
Johannes Berg5cf121c2008-02-25 16:27:43 +01002763/* TODO: use IEEE80211_RX_FRAGMENTED */
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002764static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2765 struct ieee80211_rate *rate)
Michael Wu3d30d942008-01-31 19:48:27 +01002766{
2767 struct ieee80211_sub_if_data *sdata;
2768 struct ieee80211_local *local = rx->local;
Michael Wu3d30d942008-01-31 19:48:27 +01002769 struct sk_buff *skb = rx->skb, *skb2;
2770 struct net_device *prev_dev = NULL;
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01002771 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg293702a2012-03-02 13:18:19 +01002772 int needed_headroom;
Michael Wu3d30d942008-01-31 19:48:27 +01002773
Johannes Berg554891e2010-09-24 12:38:25 +02002774 /*
2775 * If cooked monitor has been processed already, then
2776 * don't do it again. If not, set the flag.
2777 */
2778 if (rx->flags & IEEE80211_RX_CMNTR)
John W. Linville7c1e1832010-09-24 15:52:49 -04002779 goto out_free_skb;
Johannes Berg554891e2010-09-24 12:38:25 +02002780 rx->flags |= IEEE80211_RX_CMNTR;
John W. Linville7c1e1832010-09-24 15:52:49 -04002781
Johannes Berg152c4772011-10-21 10:22:22 +02002782 /* If there are no cooked monitor interfaces, just free the SKB */
2783 if (!local->cooked_mntrs)
2784 goto out_free_skb;
2785
Johannes Berg293702a2012-03-02 13:18:19 +01002786 /* room for the radiotap header based on driver features */
Johannes Berg90b9e4462012-11-16 10:09:08 +01002787 needed_headroom = ieee80211_rx_radiotap_space(local, status);
Johannes Berg293702a2012-03-02 13:18:19 +01002788
2789 if (skb_headroom(skb) < needed_headroom &&
2790 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
Michael Wu3d30d942008-01-31 19:48:27 +01002791 goto out_free_skb;
2792
Johannes Berg293702a2012-03-02 13:18:19 +01002793 /* prepend radiotap information */
Felix Fietkau973ef212012-04-16 14:56:48 +02002794 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2795 false);
Michael Wu3d30d942008-01-31 19:48:27 +01002796
2797 skb_set_mac_header(skb, 0);
2798 skb->ip_summed = CHECKSUM_UNNECESSARY;
2799 skb->pkt_type = PACKET_OTHERHOST;
2800 skb->protocol = htons(ETH_P_802_2);
2801
2802 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01002803 if (!ieee80211_sdata_running(sdata))
Michael Wu3d30d942008-01-31 19:48:27 +01002804 continue;
2805
Johannes Berg05c914f2008-09-11 00:01:58 +02002806 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Michael Wu3d30d942008-01-31 19:48:27 +01002807 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2808 continue;
2809
2810 if (prev_dev) {
2811 skb2 = skb_clone(skb, GFP_ATOMIC);
2812 if (skb2) {
2813 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04002814 netif_receive_skb(skb2);
Michael Wu3d30d942008-01-31 19:48:27 +01002815 }
2816 }
2817
2818 prev_dev = sdata->dev;
2819 sdata->dev->stats.rx_packets++;
2820 sdata->dev->stats.rx_bytes += skb->len;
2821 }
2822
2823 if (prev_dev) {
2824 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04002825 netif_receive_skb(skb);
Johannes Berg554891e2010-09-24 12:38:25 +02002826 return;
2827 }
Michael Wu3d30d942008-01-31 19:48:27 +01002828
2829 out_free_skb:
2830 dev_kfree_skb(skb);
2831}
2832
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002833static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2834 ieee80211_rx_result res)
2835{
2836 switch (res) {
2837 case RX_DROP_MONITOR:
2838 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2839 if (rx->sta)
2840 rx->sta->rx_dropped++;
2841 /* fall through */
2842 case RX_CONTINUE: {
2843 struct ieee80211_rate *rate = NULL;
2844 struct ieee80211_supported_band *sband;
2845 struct ieee80211_rx_status *status;
2846
2847 status = IEEE80211_SKB_RXCB((rx->skb));
2848
2849 sband = rx->local->hw.wiphy->bands[status->band];
Johannes Berg56146182012-11-09 15:07:02 +01002850 if (!(status->flag & RX_FLAG_HT) &&
2851 !(status->flag & RX_FLAG_VHT))
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002852 rate = &sband->bitrates[status->rate_idx];
2853
2854 ieee80211_rx_cooked_monitor(rx, rate);
2855 break;
2856 }
2857 case RX_DROP_UNUSABLE:
2858 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2859 if (rx->sta)
2860 rx->sta->rx_dropped++;
2861 dev_kfree_skb(rx->skb);
2862 break;
2863 case RX_QUEUED:
2864 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2865 break;
2866 }
2867}
2868
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002869static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2870 struct sk_buff_head *frames)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002871{
2872 ieee80211_rx_result res = RX_DROP_MONITOR;
2873 struct sk_buff *skb;
2874
2875#define CALL_RXH(rxh) \
2876 do { \
2877 res = rxh(rx); \
2878 if (res != RX_CONTINUE) \
2879 goto rxh_next; \
2880 } while (0);
2881
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002882 spin_lock_bh(&rx->local->rx_path_lock);
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002883
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002884 while ((skb = __skb_dequeue(frames))) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002885 /*
2886 * all the other fields are valid across frames
2887 * that belong to an aMPDU since they are on the
2888 * same TID from the same station
2889 */
2890 rx->skb = skb;
2891
2892 CALL_RXH(ieee80211_rx_h_decrypt)
2893 CALL_RXH(ieee80211_rx_h_check_more_data)
Johannes Berg47086fc2011-09-29 16:04:33 +02002894 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002895 CALL_RXH(ieee80211_rx_h_sta_process)
2896 CALL_RXH(ieee80211_rx_h_defragment)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002897 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2898 /* must be after MMIC verify so header is counted in MPDU mic */
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002899#ifdef CONFIG_MAC80211_MESH
2900 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2901 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2902#endif
Javier Cardona2154c812011-09-07 17:49:53 -07002903 CALL_RXH(ieee80211_rx_h_amsdu)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002904 CALL_RXH(ieee80211_rx_h_data)
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002905
2906 /* special treatment -- needs the queue */
2907 res = ieee80211_rx_h_ctrl(rx, frames);
2908 if (res != RX_CONTINUE)
2909 goto rxh_next;
2910
Johannes Berg2e161f72010-08-12 15:38:38 +02002911 CALL_RXH(ieee80211_rx_h_mgmt_check)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002912 CALL_RXH(ieee80211_rx_h_action)
Johannes Berg2e161f72010-08-12 15:38:38 +02002913 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2914 CALL_RXH(ieee80211_rx_h_action_return)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002915 CALL_RXH(ieee80211_rx_h_mgmt)
2916
2917 rxh_next:
2918 ieee80211_rx_handlers_result(rx, res);
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002919
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002920#undef CALL_RXH
2921 }
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002922
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002923 spin_unlock_bh(&rx->local->rx_path_lock);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002924}
Johannes Berg571ecf62007-07-27 15:43:22 +02002925
Johannes Berg4406c372010-09-24 11:21:06 +02002926static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
Johannes Berg58905292008-01-31 19:48:25 +01002927{
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002928 struct sk_buff_head reorder_release;
Johannes Berg58905292008-01-31 19:48:25 +01002929 ieee80211_rx_result res = RX_DROP_MONITOR;
2930
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002931 __skb_queue_head_init(&reorder_release);
2932
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002933#define CALL_RXH(rxh) \
2934 do { \
2935 res = rxh(rx); \
2936 if (res != RX_CONTINUE) \
Johannes Berg2569a822009-11-25 17:46:17 +01002937 goto rxh_next; \
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002938 } while (0);
Johannes Berg58905292008-01-31 19:48:25 +01002939
Johannes Berg49461622008-06-30 15:10:45 +02002940 CALL_RXH(ieee80211_rx_h_check)
Johannes Berg2569a822009-11-25 17:46:17 +01002941
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002942 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
Johannes Berg2569a822009-11-25 17:46:17 +01002943
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002944 ieee80211_rx_handlers(rx, &reorder_release);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002945 return;
Johannes Berg49461622008-06-30 15:10:45 +02002946
Johannes Berg2569a822009-11-25 17:46:17 +01002947 rxh_next:
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002948 ieee80211_rx_handlers_result(rx, res);
2949
2950#undef CALL_RXH
Johannes Berg58905292008-01-31 19:48:25 +01002951}
2952
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002953/*
Johannes Bergdd318572010-11-29 11:09:16 +01002954 * This function makes calls into the RX path, therefore
2955 * it has to be invoked under RCU read lock.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002956 */
2957void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2958{
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002959 struct sk_buff_head frames;
Johannes Berg554891e2010-09-24 12:38:25 +02002960 struct ieee80211_rx_data rx = {
2961 .sta = sta,
2962 .sdata = sta->sdata,
2963 .local = sta->local,
Johannes Berg9e262972011-07-07 18:45:03 +02002964 /* This is OK -- must be QoS data frame */
2965 .security_idx = tid,
2966 .seqno_idx = tid,
Helmut Schaafcf8bd32011-04-01 15:46:05 +02002967 .flags = 0,
Johannes Berg554891e2010-09-24 12:38:25 +02002968 };
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02002969 struct tid_ampdu_rx *tid_agg_rx;
2970
2971 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2972 if (!tid_agg_rx)
2973 return;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002974
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002975 __skb_queue_head_init(&frames);
2976
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02002977 spin_lock(&tid_agg_rx->reorder_lock);
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002978 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02002979 spin_unlock(&tid_agg_rx->reorder_lock);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002980
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002981 ieee80211_rx_handlers(&rx, &frames);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002982}
2983
Johannes Berg571ecf62007-07-27 15:43:22 +02002984/* main receive path */
2985
Johannes Berg20b01f82010-09-24 11:21:05 +02002986static int prepare_for_handlers(struct ieee80211_rx_data *rx,
Johannes Berg23a24de2007-07-27 15:43:22 +02002987 struct ieee80211_hdr *hdr)
2988{
Johannes Berg20b01f82010-09-24 11:21:05 +02002989 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01002990 struct sk_buff *skb = rx->skb;
2991 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2992 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02002993 int multicast = is_multicast_ether_addr(hdr->addr1);
2994
Johannes Berg51fb61e2007-12-19 01:31:27 +01002995 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02002996 case NL80211_IFTYPE_STATION:
Johannes Berg9bc383d2009-11-19 11:55:19 +01002997 if (!bssid && !sdata->u.mgd.use_4addr)
Johannes Berg23a24de2007-07-27 15:43:22 +02002998 return 0;
Johannes Berg77fdaa12009-07-07 03:45:17 +02002999 if (!multicast &&
Joe Perchesb203ca32012-05-08 18:56:52 +00003000 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
Felix Fietkau4f312332011-02-05 23:48:37 +01003001 if (!(sdata->dev->flags & IFF_PROMISC) ||
3002 sdata->u.mgd.use_4addr)
Johannes Berg23a24de2007-07-27 15:43:22 +02003003 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02003004 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02003005 }
3006 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02003007 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02003008 if (!bssid)
3009 return 0;
Felix Fietkaud7da0fc2013-09-17 11:15:43 +02003010 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3011 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3012 return 0;
Harvey Harrisona7767f92008-07-02 16:30:51 -07003013 if (ieee80211_is_beacon(hdr->frame_control)) {
Bruno Randolf9d9bf772008-02-18 11:21:36 +09003014 return 1;
Johannes Bergd48b2962012-07-06 22:19:27 +02003015 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3016 return 0;
Johannes Berg23a24de2007-07-27 15:43:22 +02003017 } else if (!multicast &&
Joe Perchesb203ca32012-05-08 18:56:52 +00003018 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
Johannes Berg4150c572007-09-17 01:29:23 -04003019 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02003020 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02003021 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003022 } else if (!rx->sta) {
3023 int rate_idx;
Johannes Berg56146182012-11-09 15:07:02 +01003024 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3025 rate_idx = 0; /* TODO: HT/VHT rates */
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003026 else
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01003027 rate_idx = status->rate_idx;
Johannes Berg8bf11d82011-12-15 11:17:37 +01003028 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3029 BIT(rate_idx));
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003030 }
Johannes Berg23a24de2007-07-27 15:43:22 +02003031 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02003032 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg6032f932008-02-23 15:17:07 +01003033 if (!multicast &&
Joe Perchesb203ca32012-05-08 18:56:52 +00003034 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
Johannes Berg6032f932008-02-23 15:17:07 +01003035 if (!(sdata->dev->flags & IFF_PROMISC))
3036 return 0;
3037
Johannes Berg554891e2010-09-24 12:38:25 +02003038 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg6032f932008-02-23 15:17:07 +01003039 }
3040 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02003041 case NL80211_IFTYPE_AP_VLAN:
3042 case NL80211_IFTYPE_AP:
Johannes Berg23a24de2007-07-27 15:43:22 +02003043 if (!bssid) {
Joe Perchesb203ca32012-05-08 18:56:52 +00003044 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
Johannes Berg23a24de2007-07-27 15:43:22 +02003045 return 0;
Johannes Bergf142c6b2012-06-18 20:07:15 +02003046 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
Johannes Berg3df6eae2011-12-06 10:39:40 +01003047 /*
3048 * Accept public action frames even when the
3049 * BSSID doesn't match, this is used for P2P
3050 * and location updates. Note that mac80211
3051 * itself never looks at these frames.
3052 */
Johannes Berg2b9ccd42013-05-13 16:42:40 +02003053 if (!multicast &&
3054 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3055 return 0;
Johannes Bergd48b2962012-07-06 22:19:27 +02003056 if (ieee80211_is_public_action(hdr, skb->len))
Johannes Berg3df6eae2011-12-06 10:39:40 +01003057 return 1;
Johannes Bergd48b2962012-07-06 22:19:27 +02003058 if (!ieee80211_is_beacon(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02003059 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02003060 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02003061 }
Johannes Berg23a24de2007-07-27 15:43:22 +02003062 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02003063 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07003064 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02003065 return 0;
Joe Perchesb203ca32012-05-08 18:56:52 +00003066 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
Johannes Berg23a24de2007-07-27 15:43:22 +02003067 return 0;
3068 break;
Johannes Bergf142c6b2012-06-18 20:07:15 +02003069 case NL80211_IFTYPE_P2P_DEVICE:
3070 if (!ieee80211_is_public_action(hdr, skb->len) &&
3071 !ieee80211_is_probe_req(hdr->frame_control) &&
3072 !ieee80211_is_probe_resp(hdr->frame_control) &&
3073 !ieee80211_is_beacon(hdr->frame_control))
3074 return 0;
Johannes Berg1b737f82013-04-18 23:42:19 +02003075 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3076 !multicast)
Johannes Bergf142c6b2012-06-18 20:07:15 +02003077 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3078 break;
Johannes Berg2ca27bc2010-09-16 14:58:23 +02003079 default:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02003080 /* should never get here */
Johannes Bergf142c6b2012-06-18 20:07:15 +02003081 WARN_ON_ONCE(1);
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02003082 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02003083 }
3084
3085 return 1;
3086}
3087
Johannes Berg571ecf62007-07-27 15:43:22 +02003088/*
Johannes Berg4406c372010-09-24 11:21:06 +02003089 * This function returns whether or not the SKB
3090 * was destined for RX processing or not, which,
3091 * if consume is true, is equivalent to whether
3092 * or not the skb was consumed.
3093 */
3094static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3095 struct sk_buff *skb, bool consume)
3096{
3097 struct ieee80211_local *local = rx->local;
3098 struct ieee80211_sub_if_data *sdata = rx->sdata;
3099 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3100 struct ieee80211_hdr *hdr = (void *)skb->data;
3101 int prepares;
3102
3103 rx->skb = skb;
Johannes Berg554891e2010-09-24 12:38:25 +02003104 status->rx_flags |= IEEE80211_RX_RA_MATCH;
Johannes Berg4406c372010-09-24 11:21:06 +02003105 prepares = prepare_for_handlers(rx, hdr);
3106
3107 if (!prepares)
3108 return false;
3109
Johannes Berg4406c372010-09-24 11:21:06 +02003110 if (!consume) {
3111 skb = skb_copy(skb, GFP_ATOMIC);
3112 if (!skb) {
3113 if (net_ratelimit())
3114 wiphy_debug(local->hw.wiphy,
Ben Greearb305dae2011-01-08 10:30:54 -08003115 "failed to copy skb for %s\n",
Johannes Berg4406c372010-09-24 11:21:06 +02003116 sdata->name);
3117 return true;
3118 }
3119
3120 rx->skb = skb;
3121 }
3122
3123 ieee80211_invoke_rx_handlers(rx);
3124 return true;
3125}
3126
3127/*
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003128 * This is the actual Rx frames handler. as it blongs to Rx path it must
3129 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02003130 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02003131static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
Christian Lamparter071d9ac2010-08-05 01:36:36 +02003132 struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02003133{
3134 struct ieee80211_local *local = hw_to_local(hw);
3135 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02003136 struct ieee80211_hdr *hdr;
Zhu Yie3cf8b32010-03-29 17:35:07 +08003137 __le16 fc;
Johannes Berg5cf121c2008-02-25 16:27:43 +01003138 struct ieee80211_rx_data rx;
Johannes Berg4406c372010-09-24 11:21:06 +02003139 struct ieee80211_sub_if_data *prev;
Ben Greear56af3262010-09-23 10:22:24 -07003140 struct sta_info *sta, *tmp, *prev_sta;
Zhu Yie3cf8b32010-03-29 17:35:07 +08003141 int err = 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02003142
Zhu Yie3cf8b32010-03-29 17:35:07 +08003143 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02003144 memset(&rx, 0, sizeof(rx));
3145 rx.skb = skb;
3146 rx.local = local;
Johannes Berg72abd812007-09-17 01:29:22 -04003147
Zhu Yie3cf8b32010-03-29 17:35:07 +08003148 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
Johannes Berg571ecf62007-07-27 15:43:22 +02003149 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02003150
Johannes Berg4a4f1a52012-10-26 00:33:36 +02003151 if (ieee80211_is_mgmt(fc)) {
3152 /* drop frame if too short for header */
3153 if (skb->len < ieee80211_hdrlen(fc))
3154 err = -ENOBUFS;
3155 else
3156 err = skb_linearize(skb);
3157 } else {
Zhu Yie3cf8b32010-03-29 17:35:07 +08003158 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
Johannes Berg4a4f1a52012-10-26 00:33:36 +02003159 }
Zhu Yie3cf8b32010-03-29 17:35:07 +08003160
3161 if (err) {
3162 dev_kfree_skb(skb);
3163 return;
3164 }
3165
3166 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg38f37142008-01-29 17:07:43 +01003167 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01003168 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01003169
Johannes Bergd48b2962012-07-06 22:19:27 +02003170 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3171 ieee80211_is_beacon(hdr->frame_control)))
3172 ieee80211_scan_rx(local, skb);
3173
Zhu Yie3cf8b32010-03-29 17:35:07 +08003174 if (ieee80211_is_data(fc)) {
Ben Greear56af3262010-09-23 10:22:24 -07003175 prev_sta = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02003176
Johannes Berg7852e362012-01-20 13:55:24 +01003177 for_each_sta_info(local, hdr->addr2, sta, tmp) {
Ben Greear56af3262010-09-23 10:22:24 -07003178 if (!prev_sta) {
3179 prev_sta = sta;
3180 continue;
3181 }
3182
3183 rx.sta = prev_sta;
3184 rx.sdata = prev_sta->sdata;
Johannes Berg4406c372010-09-24 11:21:06 +02003185 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Johannes Berg571ecf62007-07-27 15:43:22 +02003186
Ben Greear56af3262010-09-23 10:22:24 -07003187 prev_sta = sta;
Johannes Berg4406c372010-09-24 11:21:06 +02003188 }
Ben Greear56af3262010-09-23 10:22:24 -07003189
3190 if (prev_sta) {
3191 rx.sta = prev_sta;
3192 rx.sdata = prev_sta->sdata;
3193
Johannes Berg4406c372010-09-24 11:21:06 +02003194 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
Ben Greear56af3262010-09-23 10:22:24 -07003195 return;
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05303196 goto out;
Ben Greear56af3262010-09-23 10:22:24 -07003197 }
Johannes Berg4406c372010-09-24 11:21:06 +02003198 }
3199
Johannes Berg4b0dd982010-09-24 11:21:07 +02003200 prev = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02003201
Johannes Berg4b0dd982010-09-24 11:21:07 +02003202 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3203 if (!ieee80211_sdata_running(sdata))
3204 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01003205
Johannes Berg4b0dd982010-09-24 11:21:07 +02003206 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3207 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3208 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01003209
Johannes Berg4b0dd982010-09-24 11:21:07 +02003210 /*
3211 * frame is destined for this interface, but if it's
3212 * not also for the previous one we handle that after
3213 * the loop to avoid copying the SKB once too much
3214 */
Johannes Bergb2e77712007-09-26 15:19:39 +02003215
Johannes Berg4b0dd982010-09-24 11:21:07 +02003216 if (!prev) {
Johannes Berg340e11f2007-07-27 15:43:22 +02003217 prev = sdata;
Johannes Berg4b0dd982010-09-24 11:21:07 +02003218 continue;
Johannes Berg8e6f00322007-07-27 15:43:22 +02003219 }
Felix Fietkau4bb29f82010-01-22 00:36:39 +01003220
Johannes Berg7852e362012-01-20 13:55:24 +01003221 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Johannes Berg4b0dd982010-09-24 11:21:07 +02003222 rx.sdata = prev;
3223 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01003224
Johannes Berg4b0dd982010-09-24 11:21:07 +02003225 prev = sdata;
3226 }
Johannes Berg4406c372010-09-24 11:21:06 +02003227
Johannes Berg4b0dd982010-09-24 11:21:07 +02003228 if (prev) {
Johannes Berg7852e362012-01-20 13:55:24 +01003229 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Johannes Berg4b0dd982010-09-24 11:21:07 +02003230 rx.sdata = prev;
3231
3232 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3233 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02003234 }
Johannes Berg4406c372010-09-24 11:21:06 +02003235
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05303236 out:
Johannes Berg4406c372010-09-24 11:21:06 +02003237 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02003238}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003239
3240/*
3241 * This is the receive path handler. It is called by a low level driver when an
3242 * 802.11 MPDU is received from the hardware.
3243 */
John W. Linville103bf9f2009-08-20 16:34:15 -04003244void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003245{
3246 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01003247 struct ieee80211_rate *rate = NULL;
3248 struct ieee80211_supported_band *sband;
Johannes Bergf1d58c22009-06-17 13:13:00 +02003249 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg8318d782008-01-24 19:38:38 +01003250
Johannes Bergd20ef632009-10-11 15:10:40 +02003251 WARN_ON_ONCE(softirq_count() == 0);
3252
Johannes Berg444e38032012-09-30 17:08:35 +02003253 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
Johannes Berg77a980d2009-08-24 11:46:30 +02003254 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01003255
3256 sband = local->hw.wiphy->bands[status->band];
Johannes Berg77a980d2009-08-24 11:46:30 +02003257 if (WARN_ON(!sband))
3258 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01003259
Johannes Berg89c3a8a2009-07-28 18:10:17 +02003260 /*
3261 * If we're suspending, it is possible although not too likely
3262 * that we'd be receiving frames after having already partially
3263 * quiesced the stack. We can't process such frames then since
3264 * that might, for example, cause stations to be added or other
3265 * driver callbacks be invoked.
3266 */
Johannes Berg77a980d2009-08-24 11:46:30 +02003267 if (unlikely(local->quiescing || local->suspended))
3268 goto drop;
Johannes Berg89c3a8a2009-07-28 18:10:17 +02003269
Arik Nemtsov04800ad2012-06-06 11:25:02 +03003270 /* We might be during a HW reconfig, prevent Rx for the same reason */
3271 if (unlikely(local->in_reconfig))
3272 goto drop;
3273
Johannes Bergea77f122009-08-21 14:44:45 +02003274 /*
3275 * The same happens when we're not even started,
3276 * but that's worth a warning.
3277 */
Johannes Berg77a980d2009-08-24 11:46:30 +02003278 if (WARN_ON(!local->started))
3279 goto drop;
Johannes Bergea77f122009-08-21 14:44:45 +02003280
Johannes Bergfc885182010-07-30 13:23:12 +02003281 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05003282 /*
Johannes Bergfc885182010-07-30 13:23:12 +02003283 * Validate the rate, unless a PLCP error means that
3284 * we probably can't have a valid rate here anyway.
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05003285 */
Johannes Bergfc885182010-07-30 13:23:12 +02003286
3287 if (status->flag & RX_FLAG_HT) {
3288 /*
3289 * rate_idx is MCS index, which can be [0-76]
3290 * as documented on:
3291 *
3292 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3293 *
3294 * Anything else would be some sort of driver or
3295 * hardware error. The driver should catch hardware
3296 * errors.
3297 */
Johannes Berg444e38032012-09-30 17:08:35 +02003298 if (WARN(status->rate_idx > 76,
Johannes Bergfc885182010-07-30 13:23:12 +02003299 "Rate marked as an HT rate but passed "
3300 "status->rate_idx is not "
3301 "an MCS index [0-76]: %d (0x%02x)\n",
3302 status->rate_idx,
3303 status->rate_idx))
3304 goto drop;
Johannes Berg56146182012-11-09 15:07:02 +01003305 } else if (status->flag & RX_FLAG_VHT) {
3306 if (WARN_ONCE(status->rate_idx > 9 ||
3307 !status->vht_nss ||
3308 status->vht_nss > 8,
3309 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3310 status->rate_idx, status->vht_nss))
3311 goto drop;
Johannes Bergfc885182010-07-30 13:23:12 +02003312 } else {
Johannes Berg444e38032012-09-30 17:08:35 +02003313 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
Johannes Bergfc885182010-07-30 13:23:12 +02003314 goto drop;
3315 rate = &sband->bitrates[status->rate_idx];
3316 }
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003317 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003318
Johannes Berg554891e2010-09-24 12:38:25 +02003319 status->rx_flags = 0;
3320
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003321 /*
3322 * key references and virtual interfaces are protected using RCU
3323 * and this requires that we are in a read-side RCU section during
3324 * receive processing
3325 */
3326 rcu_read_lock();
3327
3328 /*
3329 * Frames with failed FCS/PLCP checksum are not returned,
3330 * all other frames are returned without radiotap header
3331 * if it was previously present.
3332 * Also, frames with less than 16 bytes are dropped.
3333 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02003334 skb = ieee80211_rx_monitor(local, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003335 if (!skb) {
3336 rcu_read_unlock();
3337 return;
3338 }
3339
Johannes Berge1e54062010-11-30 08:58:45 +01003340 ieee80211_tpt_led_trig_rx(local,
3341 ((struct ieee80211_hdr *)skb->data)->frame_control,
3342 skb->len);
Christian Lamparter071d9ac2010-08-05 01:36:36 +02003343 __ieee80211_rx_handle_packet(hw, skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003344
3345 rcu_read_unlock();
Johannes Berg77a980d2009-08-24 11:46:30 +02003346
3347 return;
3348 drop:
3349 kfree_skb(skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003350}
John W. Linville103bf9f2009-08-20 16:34:15 -04003351EXPORT_SYMBOL(ieee80211_rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02003352
3353/* This is a version of the rx handler that can be called from hard irq
3354 * context. Post the skb on the queue and schedule the tasklet */
Johannes Bergf1d58c22009-06-17 13:13:00 +02003355void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02003356{
3357 struct ieee80211_local *local = hw_to_local(hw);
3358
3359 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3360
Johannes Berg571ecf62007-07-27 15:43:22 +02003361 skb->pkt_type = IEEE80211_RX_MSG;
3362 skb_queue_tail(&local->skb_queue, skb);
3363 tasklet_schedule(&local->tasklet);
3364}
3365EXPORT_SYMBOL(ieee80211_rx_irqsafe);