blob: c24ca0d0f4697ea7040c813dbf24d1c32f707329 [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 */
Johannes Berga144f372013-07-03 13:34:02 +020090 len = sizeof(struct ieee80211_radiotap_header) + 8;
Bruno Randolf601ae7f2008-05-08 19:22:43 +020091
Johannes Berga144f372013-07-03 13:34:02 +020092 /* allocate extra bitmaps */
Johannes Berg90b9e4462012-11-16 10:09:08 +010093 if (status->vendor_radiotap_len)
94 len += 4;
Johannes Berga144f372013-07-03 13:34:02 +020095 if (status->chains)
96 len += 4 * hweight8(status->chains);
Johannes Berg90b9e4462012-11-16 10:09:08 +010097
98 if (ieee80211_have_rx_timestamp(status)) {
99 len = ALIGN(len, 8);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200100 len += 8;
Johannes Berg90b9e4462012-11-16 10:09:08 +0100101 }
Johannes Berg7fee5372009-01-30 11:13:06 +0100102 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200103 len += 1;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200104
Johannes Berga144f372013-07-03 13:34:02 +0200105 /* antenna field, if we don't have per-chain info */
106 if (!status->chains)
107 len += 1;
108
Johannes Berg90b9e4462012-11-16 10:09:08 +0100109 /* padding for RX_FLAGS if necessary */
110 len = ALIGN(len, 2);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200111
Johannes Berg6d744ba2011-01-27 14:13:17 +0100112 if (status->flag & RX_FLAG_HT) /* HT info */
113 len += 3;
114
Johannes Berg4c298672012-07-05 11:34:31 +0200115 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
Johannes Berg90b9e4462012-11-16 10:09:08 +0100116 len = ALIGN(len, 4);
Johannes Berg4c298672012-07-05 11:34:31 +0200117 len += 8;
118 }
119
Johannes Berg51648922012-11-22 23:00:18 +0100120 if (status->flag & RX_FLAG_VHT) {
121 len = ALIGN(len, 2);
122 len += 12;
123 }
124
Johannes Berga144f372013-07-03 13:34:02 +0200125 if (status->chains) {
126 /* antenna and antenna signal fields */
127 len += 2 * hweight8(status->chains);
128 }
129
Johannes Berg90b9e4462012-11-16 10:09:08 +0100130 if (status->vendor_radiotap_len) {
131 if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
132 status->vendor_radiotap_align = 1;
133 /* align standard part of vendor namespace */
134 len = ALIGN(len, 2);
135 /* allocate standard part of vendor namespace */
136 len += 6;
137 /* align vendor-defined part */
138 len = ALIGN(len, status->vendor_radiotap_align);
139 /* vendor-defined part is already in skb */
140 }
141
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200142 return len;
143}
144
Johannes Berg00ea6de2012-09-05 15:54:51 +0200145/*
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200146 * ieee80211_add_rx_radiotap_header - add radiotap header
147 *
148 * add a radiotap header containing all the fields which the hardware provided.
149 */
150static void
151ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
152 struct sk_buff *skb,
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200153 struct ieee80211_rate *rate,
Felix Fietkau973ef212012-04-16 14:56:48 +0200154 int rtap_len, bool has_fcs)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200155{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200156 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200157 struct ieee80211_radiotap_header *rthdr;
158 unsigned char *pos;
Johannes Berga144f372013-07-03 13:34:02 +0200159 __le32 *it_present;
160 u32 it_present_val;
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100161 u16 rx_flags = 0;
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200162 u16 channel_flags = 0;
Johannes Berga144f372013-07-03 13:34:02 +0200163 int mpdulen, chain;
164 unsigned long chains = status->chains;
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800165
166 mpdulen = skb->len;
167 if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
168 mpdulen += FCS_LEN;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200169
170 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
171 memset(rthdr, 0, rtap_len);
Johannes Berga144f372013-07-03 13:34:02 +0200172 it_present = &rthdr->it_present;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200173
174 /* radiotap header, set always present flags */
Johannes Berg90b9e4462012-11-16 10:09:08 +0100175 rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
Johannes Berga144f372013-07-03 13:34:02 +0200176 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
177 BIT(IEEE80211_RADIOTAP_CHANNEL) |
178 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200179
Johannes Berga144f372013-07-03 13:34:02 +0200180 if (!status->chains)
181 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
182
183 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
184 it_present_val |=
185 BIT(IEEE80211_RADIOTAP_EXT) |
186 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
187 put_unaligned_le32(it_present_val, it_present);
188 it_present++;
189 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
190 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
191 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200192
Johannes Berg90b9e4462012-11-16 10:09:08 +0100193 if (status->vendor_radiotap_len) {
Johannes Berga144f372013-07-03 13:34:02 +0200194 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
195 BIT(IEEE80211_RADIOTAP_EXT);
196 put_unaligned_le32(it_present_val, it_present);
197 it_present++;
198 it_present_val = status->vendor_radiotap_bitmap;
Johannes Berg90b9e4462012-11-16 10:09:08 +0100199 }
200
Johannes Berga144f372013-07-03 13:34:02 +0200201 put_unaligned_le32(it_present_val, it_present);
202
203 pos = (void *)(it_present + 1);
204
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200205 /* the order of the following fields is important */
206
207 /* IEEE80211_RADIOTAP_TSFT */
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800208 if (ieee80211_have_rx_timestamp(status)) {
Johannes Berg90b9e4462012-11-16 10:09:08 +0100209 /* padding */
210 while ((pos - (u8 *)rthdr) & 7)
211 *pos++ = 0;
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800212 put_unaligned_le64(
213 ieee80211_calculate_rx_timestamp(local, status,
214 mpdulen, 0),
215 pos);
Johannes Berg1df332e2012-10-26 00:09:11 +0200216 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200217 pos += 8;
218 }
219
220 /* IEEE80211_RADIOTAP_FLAGS */
Felix Fietkau973ef212012-04-16 14:56:48 +0200221 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200222 *pos |= IEEE80211_RADIOTAP_F_FCS;
Johannes Bergaae89832009-03-13 12:52:10 +0100223 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
224 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
Bruno Randolfb4f28bb2008-07-30 17:19:55 +0200225 if (status->flag & RX_FLAG_SHORTPRE)
226 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200227 pos++;
228
229 /* IEEE80211_RADIOTAP_RATE */
Johannes Berg56146182012-11-09 15:07:02 +0100230 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200231 /*
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100232 * Without rate information don't add it. If we have,
Mohammed Shafi Shajakhan38f37be2011-02-07 10:10:04 +0530233 * MCS information is a separate field in radiotap,
Johannes Berg73b48092011-04-18 17:05:21 +0200234 * added below. The byte here is needed as padding
235 * for the channel though, so initialise it to 0.
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200236 */
237 *pos = 0;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200238 } else {
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200239 int shift = 0;
Jouni Malinenebe6c7b2009-01-10 11:47:33 +0200240 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200241 if (status->flag & RX_FLAG_10MHZ)
242 shift = 1;
243 else if (status->flag & RX_FLAG_5MHZ)
244 shift = 2;
245 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200246 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200247 pos++;
248
249 /* IEEE80211_RADIOTAP_CHANNEL */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100250 put_unaligned_le16(status->freq, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200251 pos += 2;
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200252 if (status->flag & RX_FLAG_10MHZ)
253 channel_flags |= IEEE80211_CHAN_HALF;
254 else if (status->flag & RX_FLAG_5MHZ)
255 channel_flags |= IEEE80211_CHAN_QUARTER;
256
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200257 if (status->band == IEEE80211_BAND_5GHZ)
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200258 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
Johannes Berg56146182012-11-09 15:07:02 +0100259 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200260 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100261 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200262 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100263 else if (rate)
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200264 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100265 else
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200266 channel_flags |= IEEE80211_CHAN_2GHZ;
267 put_unaligned_le16(channel_flags, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200268 pos += 2;
269
270 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
Felix Fietkaufe8431f2012-03-01 18:00:07 +0100271 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
272 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200273 *pos = status->signal;
274 rthdr->it_present |=
275 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
276 pos++;
277 }
278
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200279 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
280
Johannes Berga144f372013-07-03 13:34:02 +0200281 if (!status->chains) {
282 /* IEEE80211_RADIOTAP_ANTENNA */
283 *pos = status->antenna;
284 pos++;
285 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200286
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200287 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
288
289 /* IEEE80211_RADIOTAP_RX_FLAGS */
290 /* ensure 2 byte alignment for the 2 byte field as required */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100291 if ((pos - (u8 *)rthdr) & 1)
Johannes Berg90b9e4462012-11-16 10:09:08 +0100292 *pos++ = 0;
Johannes Bergaae89832009-03-13 12:52:10 +0100293 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100294 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
295 put_unaligned_le16(rx_flags, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200296 pos += 2;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100297
298 if (status->flag & RX_FLAG_HT) {
Oleksij Rempel786677d2013-05-24 12:05:45 +0200299 unsigned int stbc;
300
Johannes Berg6d744ba2011-01-27 14:13:17 +0100301 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
Johannes Bergac55d2f2012-05-10 09:09:10 +0200302 *pos++ = local->hw.radiotap_mcs_details;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100303 *pos = 0;
304 if (status->flag & RX_FLAG_SHORT_GI)
305 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
306 if (status->flag & RX_FLAG_40MHZ)
307 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
Johannes Bergac55d2f2012-05-10 09:09:10 +0200308 if (status->flag & RX_FLAG_HT_GF)
309 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
Oleksij Rempel786677d2013-05-24 12:05:45 +0200310 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
311 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100312 pos++;
313 *pos++ = status->rate_idx;
314 }
Johannes Berg4c298672012-07-05 11:34:31 +0200315
316 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
317 u16 flags = 0;
318
319 /* ensure 4 byte alignment */
320 while ((pos - (u8 *)rthdr) & 3)
321 pos++;
322 rthdr->it_present |=
323 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
324 put_unaligned_le32(status->ampdu_reference, pos);
325 pos += 4;
326 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
327 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
328 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
329 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
330 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
331 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
332 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
333 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
334 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
335 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
336 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
337 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
338 put_unaligned_le16(flags, pos);
339 pos += 2;
340 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
341 *pos++ = status->ampdu_delimiter_crc;
342 else
343 *pos++ = 0;
344 *pos++ = 0;
345 }
Johannes Berg90b9e4462012-11-16 10:09:08 +0100346
Johannes Berg51648922012-11-22 23:00:18 +0100347 if (status->flag & RX_FLAG_VHT) {
348 u16 known = local->hw.radiotap_vht_details;
349
350 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
351 /* known field - how to handle 80+80? */
352 if (status->flag & RX_FLAG_80P80MHZ)
353 known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
354 put_unaligned_le16(known, pos);
355 pos += 2;
356 /* flags */
357 if (status->flag & RX_FLAG_SHORT_GI)
358 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
359 pos++;
360 /* bandwidth */
361 if (status->flag & RX_FLAG_80MHZ)
362 *pos++ = 4;
363 else if (status->flag & RX_FLAG_80P80MHZ)
364 *pos++ = 0; /* marked not known above */
365 else if (status->flag & RX_FLAG_160MHZ)
366 *pos++ = 11;
367 else if (status->flag & RX_FLAG_40MHZ)
368 *pos++ = 1;
369 else /* 20 MHz */
370 *pos++ = 0;
371 /* MCS/NSS */
372 *pos = (status->rate_idx << 4) | status->vht_nss;
373 pos += 4;
374 /* coding field */
375 pos++;
376 /* group ID */
377 pos++;
378 /* partial_aid */
379 pos += 2;
380 }
381
Johannes Berga144f372013-07-03 13:34:02 +0200382 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
383 *pos++ = status->chain_signal[chain];
384 *pos++ = chain;
385 }
386
Johannes Berg90b9e4462012-11-16 10:09:08 +0100387 if (status->vendor_radiotap_len) {
388 /* ensure 2 byte alignment for the vendor field as required */
389 if ((pos - (u8 *)rthdr) & 1)
390 *pos++ = 0;
391 *pos++ = status->vendor_radiotap_oui[0];
392 *pos++ = status->vendor_radiotap_oui[1];
393 *pos++ = status->vendor_radiotap_oui[2];
394 *pos++ = status->vendor_radiotap_subns;
395 put_unaligned_le16(status->vendor_radiotap_len, pos);
396 pos += 2;
397 /* align the actual payload as requested */
398 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
399 *pos++ = 0;
400 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200401}
402
Johannes Bergb2e77712007-09-26 15:19:39 +0200403/*
404 * This function copies a received frame to all monitor interfaces and
405 * returns a cleaned-up SKB that no longer includes the FCS nor the
406 * radiotap header the driver might have added.
407 */
408static struct sk_buff *
409ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
Johannes Berg8318d782008-01-24 19:38:38 +0100410 struct ieee80211_rate *rate)
Johannes Bergb2e77712007-09-26 15:19:39 +0200411{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200412 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200413 struct ieee80211_sub_if_data *sdata;
Johannes Berg293702a2012-03-02 13:18:19 +0100414 int needed_headroom;
Johannes Bergb2e77712007-09-26 15:19:39 +0200415 struct sk_buff *skb, *skb2;
416 struct net_device *prev_dev = NULL;
417 int present_fcs_len = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200418
419 /*
420 * First, we may need to make a copy of the skb because
421 * (1) we need to modify it for radiotap (if not present), and
422 * (2) the other RX handlers will modify the skb we got.
423 *
424 * We don't need to, of course, if we aren't going to return
425 * the SKB because it has a bad FCS/PLCP checksum.
426 */
Johannes Berg0869aea2009-10-28 10:03:35 +0100427
Johannes Bergb2e77712007-09-26 15:19:39 +0200428 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
429 present_fcs_len = FCS_LEN;
430
Johannes Berg605f1a52012-11-22 10:20:58 +0100431 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
432 if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
Zhu Yie3cf8b32010-03-29 17:35:07 +0800433 dev_kfree_skb(origskb);
434 return NULL;
435 }
436
Johannes Bergb2e77712007-09-26 15:19:39 +0200437 if (!local->monitors) {
Johannes Berg0869aea2009-10-28 10:03:35 +0100438 if (should_drop_frame(origskb, present_fcs_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200439 dev_kfree_skb(origskb);
440 return NULL;
441 }
442
Johannes Berg0869aea2009-10-28 10:03:35 +0100443 return remove_monitor_info(local, origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200444 }
445
Helmut Schaa751413e2012-12-05 14:36:12 +0100446 /* room for the radiotap header based on driver features */
447 needed_headroom = ieee80211_rx_radiotap_space(local, status);
448
Johannes Berg0869aea2009-10-28 10:03:35 +0100449 if (should_drop_frame(origskb, present_fcs_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200450 /* only need to expand headroom if necessary */
451 skb = origskb;
452 origskb = NULL;
453
454 /*
455 * This shouldn't trigger often because most devices have an
456 * RX header they pull before we get here, and that should
457 * be big enough for our radiotap information. We should
458 * probably export the length to drivers so that we can have
459 * them allocate enough headroom to start with.
460 */
461 if (skb_headroom(skb) < needed_headroom &&
Johannes Bergc49e5ea2007-12-11 21:33:42 +0100462 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200463 dev_kfree_skb(skb);
464 return NULL;
465 }
466 } else {
467 /*
468 * Need to make a copy and possibly remove radiotap header
469 * and FCS from the original.
470 */
471 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
472
Johannes Berg0869aea2009-10-28 10:03:35 +0100473 origskb = remove_monitor_info(local, origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200474
475 if (!skb)
476 return origskb;
477 }
478
Johannes Berg0869aea2009-10-28 10:03:35 +0100479 /* prepend radiotap information */
Felix Fietkau973ef212012-04-16 14:56:48 +0200480 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
481 true);
Johannes Bergb2e77712007-09-26 15:19:39 +0200482
Johannes Bergce3edf6d02007-12-19 01:31:22 +0100483 skb_reset_mac_header(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200484 skb->ip_summed = CHECKSUM_UNNECESSARY;
485 skb->pkt_type = PACKET_OTHERHOST;
486 skb->protocol = htons(ETH_P_802_2);
487
488 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200489 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +0200490 continue;
491
Michael Wu3d30d942008-01-31 19:48:27 +0100492 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
493 continue;
494
Johannes Berg9607e6b2009-12-23 13:15:31 +0100495 if (!ieee80211_sdata_running(sdata))
Johannes Berg47846c92009-11-25 17:46:19 +0100496 continue;
497
Johannes Bergb2e77712007-09-26 15:19:39 +0200498 if (prev_dev) {
499 skb2 = skb_clone(skb, GFP_ATOMIC);
500 if (skb2) {
501 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400502 netif_receive_skb(skb2);
Johannes Bergb2e77712007-09-26 15:19:39 +0200503 }
504 }
505
506 prev_dev = sdata->dev;
507 sdata->dev->stats.rx_packets++;
508 sdata->dev->stats.rx_bytes += skb->len;
509 }
510
511 if (prev_dev) {
512 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400513 netif_receive_skb(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200514 } else
515 dev_kfree_skb(skb);
516
517 return origskb;
518}
519
Johannes Berg5cf121c2008-02-25 16:27:43 +0100520static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200521{
Harvey Harrison238f74a2008-07-02 11:05:34 -0700522 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +0200523 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg9e262972011-07-07 18:45:03 +0200524 int tid, seqno_idx, security_idx;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200525
526 /* does the frame have a qos control field? */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700527 if (ieee80211_is_data_qos(hdr->frame_control)) {
528 u8 *qc = ieee80211_get_qos_ctl(hdr);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200529 /* frame has qos control */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700530 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
Johannes Berg04b7dcf2011-06-22 10:06:59 +0200531 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
Johannes Berg554891e2010-09-24 12:38:25 +0200532 status->rx_flags |= IEEE80211_RX_AMSDU;
Johannes Berg9e262972011-07-07 18:45:03 +0200533
534 seqno_idx = tid;
535 security_idx = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200536 } else {
Johannes Berg1411f9b2008-07-10 10:11:02 +0200537 /*
538 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
539 *
540 * Sequence numbers for management frames, QoS data
541 * frames with a broadcast/multicast address in the
542 * Address 1 field, and all non-QoS data frames sent
543 * by QoS STAs are assigned using an additional single
544 * modulo-4096 counter, [...]
545 *
546 * We also use that counter for non-QoS STAs.
547 */
Johannes Berg5a306f52012-11-14 23:22:21 +0100548 seqno_idx = IEEE80211_NUM_TIDS;
Johannes Berg9e262972011-07-07 18:45:03 +0200549 security_idx = 0;
550 if (ieee80211_is_mgmt(hdr->frame_control))
Johannes Berg5a306f52012-11-14 23:22:21 +0100551 security_idx = IEEE80211_NUM_TIDS;
Johannes Berg9e262972011-07-07 18:45:03 +0200552 tid = 0;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200553 }
Johannes Berg52865dfd2007-07-27 15:43:22 +0200554
Johannes Berg9e262972011-07-07 18:45:03 +0200555 rx->seqno_idx = seqno_idx;
556 rx->security_idx = security_idx;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200557 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
558 * For now, set skb->priority to 0 for other cases. */
559 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100560}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200561
Johannes Bergd1c3a372009-01-07 00:26:10 +0100562/**
563 * DOC: Packet alignment
564 *
565 * Drivers always need to pass packets that are aligned to two-byte boundaries
566 * to the stack.
567 *
568 * Additionally, should, if possible, align the payload data in a way that
569 * guarantees that the contained IP header is aligned to a four-byte
570 * boundary. In the case of regular frames, this simply means aligning the
571 * payload to a four-byte boundary (because either the IP header is directly
572 * contained, or IV/RFC1042 headers that have a length divisible by four are
Kalle Valo59d9cb02009-12-17 13:54:57 +0100573 * in front of it). If the payload data is not properly aligned and the
574 * architecture doesn't support efficient unaligned operations, mac80211
575 * will align the data.
Johannes Bergd1c3a372009-01-07 00:26:10 +0100576 *
577 * With A-MSDU frames, however, the payload data address must yield two modulo
578 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
579 * push the IP header further back to a multiple of four again. Thankfully, the
580 * specs were sane enough this time around to require padding each A-MSDU
581 * subframe to a length that is a multiple of four.
582 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300583 * Padding like Atheros hardware adds which is between the 802.11 header and
Johannes Bergd1c3a372009-01-07 00:26:10 +0100584 * the payload is not supported, the driver is required to move the 802.11
585 * header to be directly in front of the payload in that case.
586 */
587static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
Johannes Berg38f37142008-01-29 17:07:43 +0100588{
Kalle Valo59d9cb02009-12-17 13:54:57 +0100589#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
590 WARN_ONCE((unsigned long)rx->skb->data & 1,
591 "unaligned packet at 0x%p\n", rx->skb->data);
Johannes Bergd1c3a372009-01-07 00:26:10 +0100592#endif
Johannes Berg6e0d1142007-07-27 15:43:22 +0200593}
594
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +0200595
Johannes Berg571ecf62007-07-27 15:43:22 +0200596/* rx handlers */
597
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200598static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
599{
600 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
601
602 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
603 return 0;
604
605 return ieee80211_is_robust_mgmt_frame(hdr);
606}
607
608
609static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
610{
611 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
612
613 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
614 return 0;
615
616 return ieee80211_is_robust_mgmt_frame(hdr);
617}
618
619
620/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
621static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
622{
623 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
624 struct ieee80211_mmie *mmie;
625
Johannes Berg1df332e2012-10-26 00:09:11 +0200626 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200627 return -1;
628
629 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
630 return -1; /* not a robust management frame */
631
632 mmie = (struct ieee80211_mmie *)
633 (skb->data + skb->len - sizeof(*mmie));
634 if (mmie->element_id != WLAN_EID_MMIE ||
635 mmie->length != sizeof(*mmie) - 2)
636 return -1;
637
638 return le16_to_cpu(mmie->key_id);
639}
640
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200641static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
642 struct sk_buff *skb)
643{
644 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
645 __le16 fc;
646 int hdrlen;
647 u8 keyid;
648
649 fc = hdr->frame_control;
650 hdrlen = ieee80211_hdrlen(fc);
651
652 if (skb->len < hdrlen + cs->hdr_len)
653 return -EINVAL;
654
655 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
656 keyid &= cs->key_idx_mask;
657 keyid >>= cs->key_idx_shift;
658
659 return keyid;
660}
661
Johannes Berg1df332e2012-10-26 00:09:11 +0200662static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100663{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700664 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg47846c92009-11-25 17:46:19 +0100665 char *dev_addr = rx->sdata->vif.addr;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100666
Harvey Harrisona7767f92008-07-02 16:30:51 -0700667 if (ieee80211_is_data(hdr->frame_control)) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700668 if (is_multicast_ether_addr(hdr->addr1)) {
669 if (ieee80211_has_tods(hdr->frame_control) ||
Johannes Berg1df332e2012-10-26 00:09:11 +0200670 !ieee80211_has_fromds(hdr->frame_control))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700671 return RX_DROP_MONITOR;
Joe Perchesb203ca32012-05-08 18:56:52 +0000672 if (ether_addr_equal(hdr->addr3, dev_addr))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700673 return RX_DROP_MONITOR;
674 } else {
675 if (!ieee80211_has_a4(hdr->frame_control))
676 return RX_DROP_MONITOR;
Joe Perchesb203ca32012-05-08 18:56:52 +0000677 if (ether_addr_equal(hdr->addr4, dev_addr))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700678 return RX_DROP_MONITOR;
679 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100680 }
681
682 /* If there is not an established peer link and this is not a peer link
683 * establisment frame, beacon or probe, drop the frame.
684 */
685
Javier Cardona57cf8042011-05-13 10:45:43 -0700686 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100687 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100688
Harvey Harrisona7767f92008-07-02 16:30:51 -0700689 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100690 return RX_DROP_MONITOR;
691
Harvey Harrisona7767f92008-07-02 16:30:51 -0700692 if (ieee80211_is_action(hdr->frame_control)) {
Javier Cardonad3aaec8a2011-05-03 16:57:09 -0700693 u8 category;
Johannes Berg9b395bc2012-10-26 00:36:40 +0200694
695 /* make sure category field is present */
696 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
697 return RX_DROP_MONITOR;
698
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100699 mgmt = (struct ieee80211_mgmt *)hdr;
Javier Cardonad3aaec8a2011-05-03 16:57:09 -0700700 category = mgmt->u.action.category;
701 if (category != WLAN_CATEGORY_MESH_ACTION &&
Johannes Berg1df332e2012-10-26 00:09:11 +0200702 category != WLAN_CATEGORY_SELF_PROTECTED)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100703 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100704 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100705 }
706
Harvey Harrisona7767f92008-07-02 16:30:51 -0700707 if (ieee80211_is_probe_req(hdr->frame_control) ||
708 ieee80211_is_probe_resp(hdr->frame_control) ||
Javier Cardona71839122011-04-07 15:08:31 -0700709 ieee80211_is_beacon(hdr->frame_control) ||
710 ieee80211_is_auth(hdr->frame_control))
Harvey Harrisona7767f92008-07-02 16:30:51 -0700711 return RX_CONTINUE;
712
713 return RX_DROP_MONITOR;
Harvey Harrisona7767f92008-07-02 16:30:51 -0700714 }
715
Johannes Berg902acc72008-02-23 15:17:19 +0100716 return RX_CONTINUE;
717}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100718
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200719static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100720 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000721 int index,
722 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100723{
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100724 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
Christian Lamparter4cfda472010-12-27 23:21:26 +0100725 struct ieee80211_rx_status *status;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100726
Johannes Bergdd318572010-11-29 11:09:16 +0100727 lockdep_assert_held(&tid_agg_rx->reorder_lock);
728
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100729 if (!skb)
730 goto no_frame;
731
Christian Lamparter071d9ac2010-08-05 01:36:36 +0200732 /* release the frame from the reorder ring buffer */
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100733 tid_agg_rx->stored_mpdu_num--;
734 tid_agg_rx->reorder_buf[index] = NULL;
Christian Lamparter4cfda472010-12-27 23:21:26 +0100735 status = IEEE80211_SKB_RXCB(skb);
736 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000737 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100738
739no_frame:
Johannes Berg9a886582013-02-15 19:25:00 +0100740 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100741}
742
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200743static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100744 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000745 u16 head_seq_num,
746 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100747{
748 int index;
749
Johannes Bergdd318572010-11-29 11:09:16 +0100750 lockdep_assert_held(&tid_agg_rx->reorder_lock);
751
Johannes Berg9a886582013-02-15 19:25:00 +0100752 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
Karl Beldan2e3049b2013-10-24 15:53:32 +0200753 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000754 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
755 frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100756 }
757}
758
759/*
760 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
761 * the skb was added to the buffer longer than this time ago, the earlier
762 * frames that have not yet been received are assumed to be lost and the skb
763 * can be released for processing. This may also release other skb's from the
764 * reorder buffer if there are no additional gaps between the frames.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200765 *
766 * Callers must hold tid_agg_rx->reorder_lock.
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100767 */
768#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
769
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200770static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000771 struct tid_ampdu_rx *tid_agg_rx,
772 struct sk_buff_head *frames)
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200773{
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200774 int index, j;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200775
Johannes Bergdd318572010-11-29 11:09:16 +0100776 lockdep_assert_held(&tid_agg_rx->reorder_lock);
777
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200778 /* release the buffer until next missing frame */
Karl Beldan2e3049b2013-10-24 15:53:32 +0200779 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200780 if (!tid_agg_rx->reorder_buf[index] &&
Eliad Peller07ae2df2012-02-01 18:48:09 +0200781 tid_agg_rx->stored_mpdu_num) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200782 /*
783 * No buffers ready to be released, but check whether any
784 * frames in the reorder buffer have timed out.
785 */
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200786 int skipped = 1;
787 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
788 j = (j + 1) % tid_agg_rx->buf_size) {
789 if (!tid_agg_rx->reorder_buf[j]) {
790 skipped++;
791 continue;
792 }
Daniel Halperin499fe9a2011-03-24 16:01:48 -0700793 if (skipped &&
794 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200795 HT_RX_REORDER_BUF_TIMEOUT))
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200796 goto set_release_timer;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200797
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200798 ht_dbg_ratelimited(sdata,
799 "release an RX reorder frame due to timeout on earlier frames\n");
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000800 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
801 frames);
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200802
803 /*
804 * Increment the head seq# also for the skipped slots.
805 */
806 tid_agg_rx->head_seq_num =
Johannes Berg9a886582013-02-15 19:25:00 +0100807 (tid_agg_rx->head_seq_num +
808 skipped) & IEEE80211_SN_MASK;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200809 skipped = 0;
810 }
811 } else while (tid_agg_rx->reorder_buf[index]) {
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000812 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
813 frames);
Karl Beldan2e3049b2013-10-24 15:53:32 +0200814 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200815 }
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200816
817 if (tid_agg_rx->stored_mpdu_num) {
Karl Beldan2e3049b2013-10-24 15:53:32 +0200818 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200819
820 for (; j != (index - 1) % tid_agg_rx->buf_size;
821 j = (j + 1) % tid_agg_rx->buf_size) {
822 if (tid_agg_rx->reorder_buf[j])
823 break;
824 }
825
826 set_release_timer:
827
828 mod_timer(&tid_agg_rx->reorder_timer,
Christian Lamparter334df732011-04-24 20:41:16 +0200829 tid_agg_rx->reorder_time[j] + 1 +
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200830 HT_RX_REORDER_BUF_TIMEOUT);
831 } else {
832 del_timer(&tid_agg_rx->reorder_timer);
833 }
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200834}
835
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100836/*
837 * As this function belongs to the RX path it must be under
838 * rcu_read_lock protection. It returns false if the frame
839 * can be processed immediately, true if it was consumed.
840 */
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200841static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100842 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000843 struct sk_buff *skb,
844 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100845{
846 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
847 u16 sc = le16_to_cpu(hdr->seq_ctrl);
848 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
849 u16 head_seq_num, buf_size;
850 int index;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200851 bool ret = true;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100852
Johannes Bergdd318572010-11-29 11:09:16 +0100853 spin_lock(&tid_agg_rx->reorder_lock);
854
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100855 buf_size = tid_agg_rx->buf_size;
856 head_seq_num = tid_agg_rx->head_seq_num;
857
858 /* frame with out of date sequence number */
Johannes Berg9a886582013-02-15 19:25:00 +0100859 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100860 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200861 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100862 }
863
864 /*
865 * If frame the sequence number exceeds our buffering window
866 * size release some previous frames to make room for this one.
867 */
Johannes Berg9a886582013-02-15 19:25:00 +0100868 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
869 head_seq_num = ieee80211_sn_inc(
870 ieee80211_sn_sub(mpdu_seq_num, buf_size));
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100871 /* release stored frames up to new head to stack */
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200872 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000873 head_seq_num, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100874 }
875
876 /* Now the new frame is always in the range of the reordering buffer */
877
Karl Beldan2e3049b2013-10-24 15:53:32 +0200878 index = mpdu_seq_num % tid_agg_rx->buf_size;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100879
880 /* check if we already stored this frame */
881 if (tid_agg_rx->reorder_buf[index]) {
882 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200883 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100884 }
885
886 /*
887 * If the current MPDU is in the right order and nothing else
888 * is stored we can process it directly, no need to buffer it.
Johannes Bergc835b212011-03-15 23:17:01 +0100889 * If it is first but there's something stored, we may be able
890 * to release frames after this one.
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100891 */
892 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
893 tid_agg_rx->stored_mpdu_num == 0) {
Johannes Berg9a886582013-02-15 19:25:00 +0100894 tid_agg_rx->head_seq_num =
895 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200896 ret = false;
897 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100898 }
899
900 /* put the frame in the reordering buffer */
901 tid_agg_rx->reorder_buf[index] = skb;
902 tid_agg_rx->reorder_time[index] = jiffies;
903 tid_agg_rx->stored_mpdu_num++;
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000904 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100905
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200906 out:
907 spin_unlock(&tid_agg_rx->reorder_lock);
908 return ret;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100909}
910
911/*
912 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
913 * true if the MPDU was buffered, false if it should be processed.
914 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000915static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
916 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100917{
Johannes Berg2569a822009-11-25 17:46:17 +0100918 struct sk_buff *skb = rx->skb;
919 struct ieee80211_local *local = rx->local;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100920 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Thomas Pedersen660c6a42011-11-03 21:11:12 -0700921 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg2569a822009-11-25 17:46:17 +0100922 struct sta_info *sta = rx->sta;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100923 struct tid_ampdu_rx *tid_agg_rx;
924 u16 sc;
Thomas Pedersen6cc00d52011-11-03 21:11:11 -0700925 u8 tid, ack_policy;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100926
Johannes Berg051a41f2013-11-20 11:28:27 +0100927 if (!ieee80211_is_data_qos(hdr->frame_control) ||
928 is_multicast_ether_addr(hdr->addr1))
Johannes Berg2569a822009-11-25 17:46:17 +0100929 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100930
931 /*
932 * filter the QoS data rx stream according to
933 * STA/TID and check if this STA/TID is on aggregation
934 */
935
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100936 if (!sta)
Johannes Berg2569a822009-11-25 17:46:17 +0100937 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100938
Thomas Pedersen6cc00d52011-11-03 21:11:11 -0700939 ack_policy = *ieee80211_get_qos_ctl(hdr) &
940 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100941 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
942
Johannes Berga87f7362010-06-10 10:21:38 +0200943 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
944 if (!tid_agg_rx)
945 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100946
947 /* qos null data frames are excluded */
948 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Johannes Berga87f7362010-06-10 10:21:38 +0200949 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100950
Thomas Pedersen6cc00d52011-11-03 21:11:11 -0700951 /* not part of a BA session */
952 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
953 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
954 goto dont_reorder;
955
Thomas Pedersen660c6a42011-11-03 21:11:12 -0700956 /* not actually part of this BA session */
957 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
958 goto dont_reorder;
959
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100960 /* new, potentially un-ordered, ampdu frame - process it */
961
962 /* reset session timer */
963 if (tid_agg_rx->timeout)
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100964 tid_agg_rx->last_rx = jiffies;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100965
966 /* if this mpdu is fragmented - terminate rx aggregation session */
967 sc = le16_to_cpu(hdr->seq_ctrl);
968 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Bergc1475ca2010-06-10 10:21:37 +0200969 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg344eec62010-06-10 10:21:36 +0200970 skb_queue_tail(&rx->sdata->skb_queue, skb);
971 ieee80211_queue_work(&local->hw, &rx->sdata->work);
Johannes Berg2569a822009-11-25 17:46:17 +0100972 return;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100973 }
974
Johannes Berga87f7362010-06-10 10:21:38 +0200975 /*
976 * No locking needed -- we will only ever process one
977 * RX packet at a time, and thus own tid_agg_rx. All
978 * other code manipulating it needs to (and does) make
979 * sure that we cannot get to it any more before doing
980 * anything with it.
981 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000982 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
983 frames))
Johannes Berg2569a822009-11-25 17:46:17 +0100984 return;
985
986 dont_reorder:
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000987 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100988}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100989
Johannes Berg49461622008-06-30 15:10:45 +0200990static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100991ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200992{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700993 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +0200994 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200995
Johannes Berg6b0f3272013-07-11 22:33:26 +0200996 /*
997 * Drop duplicate 802.11 retransmissions
998 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
999 */
1000 if (rx->skb->len >= 24 && rx->sta &&
1001 !ieee80211_is_ctl(hdr->frame_control) &&
1002 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1003 !is_multicast_ether_addr(hdr->addr1)) {
Harvey Harrisona7767f92008-07-02 16:30:51 -07001004 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
Johannes Berg9e262972011-07-07 18:45:03 +02001005 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
Johannes Berg571ecf62007-07-27 15:43:22 +02001006 hdr->seq_ctrl)) {
Johannes Berg554891e2010-09-24 12:38:25 +02001007 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001008 rx->local->dot11FrameDuplicateCount++;
1009 rx->sta->num_duplicates++;
1010 }
Felix Fietkaub1f93312011-02-04 19:20:08 +01001011 return RX_DROP_UNUSABLE;
Michal Kazior0cfcefe2013-09-23 15:34:38 +02001012 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
Johannes Berg9e262972011-07-07 18:45:03 +02001013 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
Michal Kazior0cfcefe2013-09-23 15:34:38 +02001014 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001015 }
1016
Johannes Berg571ecf62007-07-27 15:43:22 +02001017 if (unlikely(rx->skb->len < 16)) {
1018 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001019 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001020 }
1021
Johannes Berg571ecf62007-07-27 15:43:22 +02001022 /* Drop disallowed frame classes based on STA auth/assoc state;
1023 * IEEE 802.11, Chap 5.5.
1024 *
Johannes Bergccd7b362008-09-11 00:01:56 +02001025 * mac80211 filters only based on association state, i.e. it drops
1026 * Class 3 frames from not associated stations. hostapd sends
Johannes Berg571ecf62007-07-27 15:43:22 +02001027 * deauth/disassoc frames when needed. In addition, hostapd is
1028 * responsible for filtering on both auth and assoc states.
1029 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001030
Johannes Berg902acc72008-02-23 15:17:19 +01001031 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001032 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001033
Harvey Harrisona7767f92008-07-02 16:30:51 -07001034 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1035 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001036 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Bill Jordan1be7fe82010-10-01 11:20:41 -04001037 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001038 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
Johannes Berg7852e362012-01-20 13:55:24 +01001039 /*
1040 * accept port control frames from the AP even when it's not
1041 * yet marked ASSOC to prevent a race where we don't set the
1042 * assoc bit quickly enough before it sends the first frame
1043 */
1044 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
Guy Eilam2a33bee2011-08-17 15:18:15 +03001045 ieee80211_is_data_present(hdr->frame_control)) {
Johannes Berg6dbda2d2012-10-26 00:41:23 +02001046 unsigned int hdrlen;
1047 __be16 ethertype;
Guy Eilam2a33bee2011-08-17 15:18:15 +03001048
Johannes Berg6dbda2d2012-10-26 00:41:23 +02001049 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1050
1051 if (rx->skb->len < hdrlen + 8)
1052 return RX_DROP_MONITOR;
1053
1054 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1055 if (ethertype == rx->sdata->control_port_protocol)
Guy Eilam2a33bee2011-08-17 15:18:15 +03001056 return RX_CONTINUE;
1057 }
Johannes Berg21fc7562011-11-04 11:18:13 +01001058
1059 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1060 cfg80211_rx_spurious_frame(rx->sdata->dev,
1061 hdr->addr2,
1062 GFP_ATOMIC))
1063 return RX_DROP_UNUSABLE;
1064
Johannes Berge4c26ad2008-01-31 19:48:21 +01001065 return RX_DROP_MONITOR;
Guy Eilam2a33bee2011-08-17 15:18:15 +03001066 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001067
Johannes Berg9ae54c82008-01-31 19:48:20 +01001068 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +02001069}
1070
1071
Johannes Berg49461622008-06-30 15:10:45 +02001072static ieee80211_rx_result debug_noinline
Kalle Valo572e0012009-02-10 17:09:31 +02001073ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1074{
1075 struct ieee80211_local *local;
1076 struct ieee80211_hdr *hdr;
1077 struct sk_buff *skb;
1078
1079 local = rx->local;
1080 skb = rx->skb;
1081 hdr = (struct ieee80211_hdr *) skb->data;
1082
1083 if (!local->pspolling)
1084 return RX_CONTINUE;
1085
1086 if (!ieee80211_has_fromds(hdr->frame_control))
1087 /* this is not from AP */
1088 return RX_CONTINUE;
1089
1090 if (!ieee80211_is_data(hdr->frame_control))
1091 return RX_CONTINUE;
1092
1093 if (!ieee80211_has_moredata(hdr->frame_control)) {
1094 /* AP has no more frames buffered for us */
1095 local->pspolling = false;
1096 return RX_CONTINUE;
1097 }
1098
1099 /* more data bit is set, let's request a new frame from the AP */
1100 ieee80211_send_pspoll(local, rx->sdata);
1101
1102 return RX_CONTINUE;
1103}
1104
Marco Porschd012a602012-10-10 12:39:50 -07001105static void sta_ps_start(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001106{
Johannes Berg133b8222008-09-16 14:18:59 +02001107 struct ieee80211_sub_if_data *sdata = sta->sdata;
Christian Lamparter4571d3b2008-11-30 00:48:41 +01001108 struct ieee80211_local *local = sdata->local;
Marco Porschd012a602012-10-10 12:39:50 -07001109 struct ps_data *ps;
Joe Perches0795af52007-10-03 17:59:30 -07001110
Marco Porschd012a602012-10-10 12:39:50 -07001111 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1112 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1113 ps = &sdata->bss->ps;
1114 else
1115 return;
1116
1117 atomic_inc(&ps->num_sta_ps);
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001118 set_sta_flag(sta, WLAN_STA_PS_STA);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001119 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1120 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001121 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1122 sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001123}
1124
Marco Porschd012a602012-10-10 12:39:50 -07001125static void sta_ps_end(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001126{
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001127 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1128 sta->sta.addr, sta->sta.aid);
Johannes Berg004c8722008-02-20 11:21:35 +01001129
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001130 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001131 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1132 sta->sta.addr, sta->sta.aid);
Johannes Bergaf818582009-11-06 11:35:50 +01001133 return;
1134 }
1135
1136 ieee80211_sta_ps_deliver_wakeup(sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001137}
1138
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001139int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1140{
1141 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1142 bool in_ps;
1143
1144 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1145
1146 /* Don't let the same PS state be set twice */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001147 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001148 if ((start && in_ps) || (!start && !in_ps))
1149 return -EINVAL;
1150
1151 if (start)
Marco Porschd012a602012-10-10 12:39:50 -07001152 sta_ps_start(sta_inf);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001153 else
Marco Porschd012a602012-10-10 12:39:50 -07001154 sta_ps_end(sta_inf);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001155
1156 return 0;
1157}
1158EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1159
Johannes Berg49461622008-06-30 15:10:45 +02001160static ieee80211_rx_result debug_noinline
Johannes Berg47086fc2011-09-29 16:04:33 +02001161ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1162{
1163 struct ieee80211_sub_if_data *sdata = rx->sdata;
1164 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1165 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1166 int tid, ac;
1167
1168 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1169 return RX_CONTINUE;
1170
1171 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1172 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1173 return RX_CONTINUE;
1174
1175 /*
1176 * The device handles station powersave, so don't do anything about
1177 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1178 * it to mac80211 since they're handled.)
1179 */
1180 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1181 return RX_CONTINUE;
1182
1183 /*
1184 * Don't do anything if the station isn't already asleep. In
1185 * the uAPSD case, the station will probably be marked asleep,
1186 * in the PS-Poll case the station must be confused ...
1187 */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001188 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
Johannes Berg47086fc2011-09-29 16:04:33 +02001189 return RX_CONTINUE;
1190
1191 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001192 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1193 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
Johannes Bergdeeaee192011-09-29 16:04:35 +02001194 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1195 else
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001196 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
Johannes Bergdeeaee192011-09-29 16:04:35 +02001197 }
Johannes Berg47086fc2011-09-29 16:04:33 +02001198
1199 /* Free PS Poll skb here instead of returning RX_DROP that would
1200 * count as an dropped frame. */
1201 dev_kfree_skb(rx->skb);
1202
1203 return RX_QUEUED;
1204 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1205 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1206 ieee80211_has_pm(hdr->frame_control) &&
1207 (ieee80211_is_data_qos(hdr->frame_control) ||
1208 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1209 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1210 ac = ieee802_1d_to_ac[tid & 7];
1211
1212 /*
1213 * If this AC is not trigger-enabled do nothing.
1214 *
1215 * NB: This could/should check a separate bitmap of trigger-
1216 * enabled queues, but for now we only implement uAPSD w/o
1217 * TSPEC changes to the ACs, so they're always the same.
1218 */
1219 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1220 return RX_CONTINUE;
1221
1222 /* if we are in a service period, do nothing */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001223 if (test_sta_flag(rx->sta, WLAN_STA_SP))
Johannes Berg47086fc2011-09-29 16:04:33 +02001224 return RX_CONTINUE;
1225
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001226 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
Johannes Berg47086fc2011-09-29 16:04:33 +02001227 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1228 else
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001229 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
Johannes Berg47086fc2011-09-29 16:04:33 +02001230 }
1231
1232 return RX_CONTINUE;
1233}
1234
1235static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001236ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001237{
1238 struct sta_info *sta = rx->sta;
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01001239 struct sk_buff *skb = rx->skb;
1240 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1241 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Felix Fietkauef0621e2013-04-22 16:29:31 +02001242 int i;
Johannes Berg571ecf62007-07-27 15:43:22 +02001243
1244 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001245 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001246
Johannes Bergb291ba12009-07-10 15:29:03 +02001247 /*
1248 * Update last_rx only for IBSS packets which are for the current
Antonio Quartullie584da5e2012-11-25 23:13:42 +01001249 * BSSID and for station already AUTHORIZED to avoid keeping the
1250 * current IBSS network alive in cases where other STAs start
1251 * using different BSSID. This will also give the station another
1252 * chance to restart the authentication/authorization in case
1253 * something went wrong the first time.
Johannes Bergb291ba12009-07-10 15:29:03 +02001254 */
Johannes Berg05c914f2008-09-11 00:01:58 +02001255 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001256 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +02001257 NL80211_IFTYPE_ADHOC);
Antonio Quartullie584da5e2012-11-25 23:13:42 +01001258 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1259 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001260 sta->last_rx = jiffies;
Felix Fietkau3af63342011-02-27 22:08:01 +01001261 if (ieee80211_is_data(hdr->frame_control)) {
1262 sta->last_rx_rate_idx = status->rate_idx;
1263 sta->last_rx_rate_flag = status->flag;
Johannes Berg56146182012-11-09 15:07:02 +01001264 sta->last_rx_rate_vht_nss = status->vht_nss;
Felix Fietkau3af63342011-02-27 22:08:01 +01001265 }
1266 }
Johannes Bergb291ba12009-07-10 15:29:03 +02001267 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1268 /*
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001269 * Mesh beacons will update last_rx when if they are found to
1270 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +02001271 */
Johannes Bergb291ba12009-07-10 15:29:03 +02001272 sta->last_rx = jiffies;
Felix Fietkau3af63342011-02-27 22:08:01 +01001273 if (ieee80211_is_data(hdr->frame_control)) {
1274 sta->last_rx_rate_idx = status->rate_idx;
1275 sta->last_rx_rate_flag = status->flag;
Johannes Berg56146182012-11-09 15:07:02 +01001276 sta->last_rx_rate_vht_nss = status->vht_nss;
Felix Fietkau3af63342011-02-27 22:08:01 +01001277 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001278 }
1279
Johannes Berg554891e2010-09-24 12:38:25 +02001280 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001281 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001282
Kalle Valo3cf335d2009-03-22 21:57:06 +02001283 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1284 ieee80211_sta_rx_notify(rx->sdata, hdr);
1285
Johannes Berg571ecf62007-07-27 15:43:22 +02001286 sta->rx_fragments++;
1287 sta->rx_bytes += rx->skb->len;
Felix Fietkaufe8431f2012-03-01 18:00:07 +01001288 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1289 sta->last_signal = status->signal;
1290 ewma_add(&sta->avg_signal, -status->signal);
1291 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001292
Felix Fietkauef0621e2013-04-22 16:29:31 +02001293 if (status->chains) {
1294 sta->chains = status->chains;
1295 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1296 int signal = status->chain_signal[i];
1297
1298 if (!(status->chains & BIT(i)))
1299 continue;
1300
1301 sta->chain_signal_last[i] = signal;
1302 ewma_add(&sta->chain_signal_avg[i], -signal);
1303 }
1304 }
1305
Johannes Berg72eaa432008-11-26 15:02:58 +01001306 /*
1307 * Change STA power saving mode only at the end of a frame
1308 * exchange sequence.
1309 */
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001310 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1311 !ieee80211_has_morefrags(hdr->frame_control) &&
Christian Lamparter4cfda472010-12-27 23:21:26 +01001312 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001313 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1314 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001315 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
Johannes Berg72eaa432008-11-26 15:02:58 +01001316 /*
1317 * Ignore doze->wake transitions that are
1318 * indicated by non-data frames, the standard
1319 * is unclear here, but for example going to
1320 * PS mode and then scanning would cause a
1321 * doze->wake transition for the probe request,
1322 * and that is clearly undesirable.
1323 */
1324 if (ieee80211_is_data(hdr->frame_control) &&
1325 !ieee80211_has_pm(hdr->frame_control))
Marco Porschd012a602012-10-10 12:39:50 -07001326 sta_ps_end(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001327 } else {
1328 if (ieee80211_has_pm(hdr->frame_control))
Marco Porschd012a602012-10-10 12:39:50 -07001329 sta_ps_start(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001330 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001331 }
1332
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001333 /* mesh power save support */
1334 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1335 ieee80211_mps_rx_h_sta_process(sta, hdr);
1336
Johannes Berg22403de2009-10-30 12:55:03 +01001337 /*
1338 * Drop (qos-)data::nullfunc frames silently, since they
1339 * are used only to control station power saving mode.
1340 */
1341 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1342 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001343 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
Felix Fietkaud5242152010-01-08 18:06:26 +01001344
1345 /*
1346 * If we receive a 4-addr nullfunc frame from a STA
Johannes Berge7f4a942011-11-04 11:18:20 +01001347 * that was not moved to a 4-addr STA vlan yet send
1348 * the event to userspace and for older hostapd drop
1349 * the frame to the monitor interface.
Felix Fietkaud5242152010-01-08 18:06:26 +01001350 */
1351 if (ieee80211_has_a4(hdr->frame_control) &&
1352 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1353 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
Johannes Berge7f4a942011-11-04 11:18:20 +01001354 !rx->sdata->u.vlan.sta))) {
1355 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1356 cfg80211_rx_unexpected_4addr_frame(
1357 rx->sdata->dev, sta->sta.addr,
1358 GFP_ATOMIC);
Felix Fietkaud5242152010-01-08 18:06:26 +01001359 return RX_DROP_MONITOR;
Johannes Berge7f4a942011-11-04 11:18:20 +01001360 }
Johannes Berg22403de2009-10-30 12:55:03 +01001361 /*
1362 * Update counter and free packet here to avoid
1363 * counting this as a dropped packed.
1364 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001365 sta->rx_packets++;
1366 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001367 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001368 }
1369
Johannes Berg9ae54c82008-01-31 19:48:20 +01001370 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001371} /* ieee80211_rx_h_sta_process */
1372
Johan Almbladh86c228a2013-08-14 15:29:46 +02001373static ieee80211_rx_result debug_noinline
1374ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1375{
1376 struct sk_buff *skb = rx->skb;
1377 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1378 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1379 int keyidx;
1380 int hdrlen;
1381 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1382 struct ieee80211_key *sta_ptk = NULL;
1383 int mmie_keyidx = -1;
1384 __le16 fc;
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001385 const struct ieee80211_cipher_scheme *cs = NULL;
Johan Almbladh86c228a2013-08-14 15:29:46 +02001386
1387 /*
1388 * Key selection 101
1389 *
1390 * There are four types of keys:
1391 * - GTK (group keys)
1392 * - IGTK (group keys for management frames)
1393 * - PTK (pairwise keys)
1394 * - STK (station-to-station pairwise keys)
1395 *
1396 * When selecting a key, we have to distinguish between multicast
1397 * (including broadcast) and unicast frames, the latter can only
1398 * use PTKs and STKs while the former always use GTKs and IGTKs.
1399 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1400 * unicast frames can also use key indices like GTKs. Hence, if we
1401 * don't have a PTK/STK we check the key index for a WEP key.
1402 *
1403 * Note that in a regular BSS, multicast frames are sent by the
1404 * AP only, associated stations unicast the frame to the AP first
1405 * which then multicasts it on their behalf.
1406 *
1407 * There is also a slight problem in IBSS mode: GTKs are negotiated
1408 * with each station, that is something we don't currently handle.
1409 * The spec seems to expect that one negotiates the same key with
1410 * every station but there's no such requirement; VLANs could be
1411 * possible.
1412 */
1413
1414 /*
1415 * No point in finding a key and decrypting if the frame is neither
1416 * addressed to us nor a multicast frame.
1417 */
1418 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1419 return RX_CONTINUE;
1420
1421 /* start without a key */
1422 rx->key = NULL;
Johan Almbladh86c228a2013-08-14 15:29:46 +02001423 fc = hdr->frame_control;
1424
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001425 if (rx->sta) {
1426 int keyid = rx->sta->ptk_idx;
1427
1428 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1429 cs = rx->sta->cipher_scheme;
1430 keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1431 if (unlikely(keyid < 0))
1432 return RX_DROP_UNUSABLE;
1433 }
1434 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1435 }
1436
Johan Almbladh86c228a2013-08-14 15:29:46 +02001437 if (!ieee80211_has_protected(fc))
1438 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1439
1440 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1441 rx->key = sta_ptk;
1442 if ((status->flag & RX_FLAG_DECRYPTED) &&
1443 (status->flag & RX_FLAG_IV_STRIPPED))
1444 return RX_CONTINUE;
1445 /* Skip decryption if the frame is not protected. */
1446 if (!ieee80211_has_protected(fc))
1447 return RX_CONTINUE;
1448 } else if (mmie_keyidx >= 0) {
1449 /* Broadcast/multicast robust management frame / BIP */
1450 if ((status->flag & RX_FLAG_DECRYPTED) &&
1451 (status->flag & RX_FLAG_IV_STRIPPED))
1452 return RX_CONTINUE;
1453
1454 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1455 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1456 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1457 if (rx->sta)
1458 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1459 if (!rx->key)
1460 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1461 } else if (!ieee80211_has_protected(fc)) {
1462 /*
1463 * The frame was not protected, so skip decryption. However, we
1464 * need to set rx->key if there is a key that could have been
1465 * used so that the frame may be dropped if encryption would
1466 * have been expected.
1467 */
1468 struct ieee80211_key *key = NULL;
1469 struct ieee80211_sub_if_data *sdata = rx->sdata;
1470 int i;
1471
1472 if (ieee80211_is_mgmt(fc) &&
1473 is_multicast_ether_addr(hdr->addr1) &&
1474 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1475 rx->key = key;
1476 else {
1477 if (rx->sta) {
1478 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1479 key = rcu_dereference(rx->sta->gtk[i]);
1480 if (key)
1481 break;
1482 }
1483 }
1484 if (!key) {
1485 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1486 key = rcu_dereference(sdata->keys[i]);
1487 if (key)
1488 break;
1489 }
1490 }
1491 if (key)
1492 rx->key = key;
1493 }
1494 return RX_CONTINUE;
1495 } else {
1496 u8 keyid;
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001497
Johan Almbladh86c228a2013-08-14 15:29:46 +02001498 /*
1499 * The device doesn't give us the IV so we won't be
1500 * able to look up the key. That's ok though, we
1501 * don't need to decrypt the frame, we just won't
1502 * be able to keep statistics accurate.
1503 * Except for key threshold notifications, should
1504 * we somehow allow the driver to tell us which key
1505 * the hardware used if this flag is set?
1506 */
1507 if ((status->flag & RX_FLAG_DECRYPTED) &&
1508 (status->flag & RX_FLAG_IV_STRIPPED))
1509 return RX_CONTINUE;
1510
1511 hdrlen = ieee80211_hdrlen(fc);
1512
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001513 if (cs) {
1514 keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
Johan Almbladh86c228a2013-08-14 15:29:46 +02001515
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001516 if (unlikely(keyidx < 0))
1517 return RX_DROP_UNUSABLE;
1518 } else {
1519 if (rx->skb->len < 8 + hdrlen)
1520 return RX_DROP_UNUSABLE; /* TODO: count this? */
1521 /*
1522 * no need to call ieee80211_wep_get_keyidx,
1523 * it verifies a bunch of things we've done already
1524 */
1525 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1526 keyidx = keyid >> 6;
1527 }
Johan Almbladh86c228a2013-08-14 15:29:46 +02001528
1529 /* check per-station GTK first, if multicast packet */
1530 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1531 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1532
1533 /* if not found, try default key */
1534 if (!rx->key) {
1535 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1536
1537 /*
1538 * RSNA-protected unicast frames should always be
1539 * sent with pairwise or station-to-station keys,
1540 * but for WEP we allow using a key index as well.
1541 */
1542 if (rx->key &&
1543 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1544 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1545 !is_multicast_ether_addr(hdr->addr1))
1546 rx->key = NULL;
1547 }
1548 }
1549
1550 if (rx->key) {
1551 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1552 return RX_DROP_MONITOR;
1553
1554 rx->key->tx_rx_count++;
1555 /* TODO: add threshold stuff again */
1556 } else {
1557 return RX_DROP_MONITOR;
1558 }
1559
1560 switch (rx->key->conf.cipher) {
1561 case WLAN_CIPHER_SUITE_WEP40:
1562 case WLAN_CIPHER_SUITE_WEP104:
1563 result = ieee80211_crypto_wep_decrypt(rx);
1564 break;
1565 case WLAN_CIPHER_SUITE_TKIP:
1566 result = ieee80211_crypto_tkip_decrypt(rx);
1567 break;
1568 case WLAN_CIPHER_SUITE_CCMP:
1569 result = ieee80211_crypto_ccmp_decrypt(rx);
1570 break;
1571 case WLAN_CIPHER_SUITE_AES_CMAC:
1572 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1573 break;
1574 default:
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001575 result = ieee80211_crypto_hw_decrypt(rx);
Johan Almbladh86c228a2013-08-14 15:29:46 +02001576 }
1577
1578 /* the hdr variable is invalid after the decrypt handlers */
1579
1580 /* either the frame has been decrypted or will be dropped */
1581 status->flag |= RX_FLAG_DECRYPTED;
1582
1583 return result;
1584}
1585
Johannes Berg571ecf62007-07-27 15:43:22 +02001586static inline struct ieee80211_fragment_entry *
1587ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1588 unsigned int frag, unsigned int seq, int rx_queue,
1589 struct sk_buff **skb)
1590{
1591 struct ieee80211_fragment_entry *entry;
Johannes Berg571ecf62007-07-27 15:43:22 +02001592
Johannes Berg571ecf62007-07-27 15:43:22 +02001593 entry = &sdata->fragments[sdata->fragment_next++];
1594 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1595 sdata->fragment_next = 0;
1596
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001597 if (!skb_queue_empty(&entry->skb_list))
Johannes Berg571ecf62007-07-27 15:43:22 +02001598 __skb_queue_purge(&entry->skb_list);
Johannes Berg571ecf62007-07-27 15:43:22 +02001599
1600 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1601 *skb = NULL;
1602 entry->first_frag_time = jiffies;
1603 entry->seq = seq;
1604 entry->rx_queue = rx_queue;
1605 entry->last_frag = frag;
1606 entry->ccmp = 0;
1607 entry->extra_len = 0;
1608
1609 return entry;
1610}
1611
1612static inline struct ieee80211_fragment_entry *
1613ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001614 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +02001615 int rx_queue, struct ieee80211_hdr *hdr)
1616{
1617 struct ieee80211_fragment_entry *entry;
1618 int i, idx;
1619
1620 idx = sdata->fragment_next;
1621 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1622 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +02001623
1624 idx--;
1625 if (idx < 0)
1626 idx = IEEE80211_FRAGMENT_MAX - 1;
1627
1628 entry = &sdata->fragments[idx];
1629 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1630 entry->rx_queue != rx_queue ||
1631 entry->last_frag + 1 != frag)
1632 continue;
1633
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001634 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001635
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001636 /*
1637 * Check ftype and addresses are equal, else check next fragment
1638 */
1639 if (((hdr->frame_control ^ f_hdr->frame_control) &
1640 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Joe Perchesb203ca32012-05-08 18:56:52 +00001641 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1642 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
Johannes Berg571ecf62007-07-27 15:43:22 +02001643 continue;
1644
S.Çağlar Onurab466232008-02-14 17:36:47 +02001645 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001646 __skb_queue_purge(&entry->skb_list);
1647 continue;
1648 }
1649 return entry;
1650 }
1651
1652 return NULL;
1653}
1654
Johannes Berg49461622008-06-30 15:10:45 +02001655static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001656ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001657{
1658 struct ieee80211_hdr *hdr;
1659 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001660 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001661 unsigned int frag, seq;
1662 struct ieee80211_fragment_entry *entry;
1663 struct sk_buff *skb;
Johannes Berg554891e2010-09-24 12:38:25 +02001664 struct ieee80211_rx_status *status;
Johannes Berg571ecf62007-07-27 15:43:22 +02001665
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001666 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001667 fc = hdr->frame_control;
Javier Cardonaf7fbf702012-10-25 11:10:18 -07001668
1669 if (ieee80211_is_ctl(fc))
1670 return RX_CONTINUE;
1671
Johannes Berg571ecf62007-07-27 15:43:22 +02001672 sc = le16_to_cpu(hdr->seq_ctrl);
1673 frag = sc & IEEE80211_SCTL_FRAG;
1674
Harvey Harrison358c8d92008-07-15 18:44:13 -07001675 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001676 is_multicast_ether_addr(hdr->addr1))) {
1677 /* not fragmented */
1678 goto out;
1679 }
1680 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1681
Zhu Yie3cf8b32010-03-29 17:35:07 +08001682 if (skb_linearize(rx->skb))
1683 return RX_DROP_UNUSABLE;
1684
Abhijeet Kolekar058897a2010-05-11 11:22:11 -07001685 /*
1686 * skb_linearize() might change the skb->data and
1687 * previously cached variables (in this case, hdr) need to
1688 * be refreshed with the new data.
1689 */
1690 hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001691 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1692
1693 if (frag == 0) {
1694 /* This is the first fragment of a new frame. */
1695 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg9e262972011-07-07 18:45:03 +02001696 rx->seqno_idx, &(rx->skb));
Johannes Berg97359d12010-08-10 09:46:38 +02001697 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
Harvey Harrison358c8d92008-07-15 18:44:13 -07001698 ieee80211_has_protected(fc)) {
Johannes Berg9e262972011-07-07 18:45:03 +02001699 int queue = rx->security_idx;
Johannes Berg571ecf62007-07-27 15:43:22 +02001700 /* Store CCMP PN so that we can verify that the next
1701 * fragment has a sequential PN value. */
1702 entry->ccmp = 1;
1703 memcpy(entry->last_pn,
Jouni Malinen91902522010-06-11 10:27:33 -07001704 rx->key->u.ccmp.rx_pn[queue],
Johannes Berg4325f6c2013-05-08 13:09:08 +02001705 IEEE80211_CCMP_PN_LEN);
Johannes Berg571ecf62007-07-27 15:43:22 +02001706 }
Johannes Berg9ae54c82008-01-31 19:48:20 +01001707 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001708 }
1709
1710 /* This is a fragment for a frame that should already be pending in
1711 * fragment cache. Add this fragment to the end of the pending entry.
1712 */
Johannes Berg9e262972011-07-07 18:45:03 +02001713 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1714 rx->seqno_idx, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001715 if (!entry) {
1716 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001717 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001718 }
1719
1720 /* Verify that MPDUs within one MSDU have sequential PN values.
1721 * (IEEE 802.11i, 8.3.3.4.5) */
1722 if (entry->ccmp) {
1723 int i;
Johannes Berg4325f6c2013-05-08 13:09:08 +02001724 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
Jouni Malinen91902522010-06-11 10:27:33 -07001725 int queue;
Johannes Berg97359d12010-08-10 09:46:38 +02001726 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001727 return RX_DROP_UNUSABLE;
Johannes Berg4325f6c2013-05-08 13:09:08 +02001728 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1729 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001730 pn[i]++;
1731 if (pn[i])
1732 break;
1733 }
Johannes Berg9e262972011-07-07 18:45:03 +02001734 queue = rx->security_idx;
Jouni Malinen91902522010-06-11 10:27:33 -07001735 rpn = rx->key->u.ccmp.rx_pn[queue];
Johannes Berg4325f6c2013-05-08 13:09:08 +02001736 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001737 return RX_DROP_UNUSABLE;
Johannes Berg4325f6c2013-05-08 13:09:08 +02001738 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
Johannes Berg571ecf62007-07-27 15:43:22 +02001739 }
1740
Harvey Harrison358c8d92008-07-15 18:44:13 -07001741 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +02001742 __skb_queue_tail(&entry->skb_list, rx->skb);
1743 entry->last_frag = frag;
1744 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001745 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001746 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001747 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001748 }
1749
1750 rx->skb = __skb_dequeue(&entry->skb_list);
1751 if (skb_tailroom(rx->skb) < entry->extra_len) {
1752 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1753 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1754 GFP_ATOMIC))) {
1755 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1756 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001757 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001758 }
1759 }
1760 while ((skb = __skb_dequeue(&entry->skb_list))) {
1761 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1762 dev_kfree_skb(skb);
1763 }
1764
1765 /* Complete frame has been reassembled - process it now */
Johannes Berg554891e2010-09-24 12:38:25 +02001766 status = IEEE80211_SKB_RXCB(rx->skb);
1767 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001768
1769 out:
1770 if (rx->sta)
1771 rx->sta->rx_packets++;
1772 if (is_multicast_ether_addr(hdr->addr1))
1773 rx->local->dot11MulticastReceivedFrameCount++;
1774 else
1775 ieee80211_led_rx(rx->local);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001776 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001777}
1778
Johannes Berg1df332e2012-10-26 00:09:11 +02001779static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001780{
Johannes Berg1df332e2012-10-26 00:09:11 +02001781 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001782 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001783
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001784 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001785}
1786
Johannes Berg1df332e2012-10-26 00:09:11 +02001787static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02001788{
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01001789 struct sk_buff *skb = rx->skb;
1790 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1791
Johannes Berg3017b802007-08-28 17:01:53 -04001792 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001793 * Pass through unencrypted frames if the hardware has
1794 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001795 */
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01001796 if (status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001797 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001798
1799 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001800 if (unlikely(!ieee80211_has_protected(fc) &&
1801 !ieee80211_is_nullfunc(fc) &&
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001802 ieee80211_is_data(fc) &&
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001803 (rx->key || rx->sdata->drop_unencrypted)))
1804 return -EACCES;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001805
1806 return 0;
1807}
1808
Johannes Berg1df332e2012-10-26 00:09:11 +02001809static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001810{
1811 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Jouni Malinene3efca02010-03-28 22:31:15 -07001812 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001813 __le16 fc = hdr->frame_control;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001814
Jouni Malinene3efca02010-03-28 22:31:15 -07001815 /*
1816 * Pass through unencrypted frames if the hardware has
1817 * decrypted them already.
1818 */
1819 if (status->flag & RX_FLAG_DECRYPTED)
1820 return 0;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001821
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001822 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
Jouni Malinend211e902010-03-28 22:29:52 -07001823 if (unlikely(!ieee80211_has_protected(fc) &&
1824 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02001825 rx->key)) {
Johannes Berg6ff57cf2013-05-16 00:55:00 +02001826 if (ieee80211_is_deauth(fc) ||
1827 ieee80211_is_disassoc(fc))
1828 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1829 rx->skb->data,
1830 rx->skb->len);
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001831 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02001832 }
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001833 /* BIP does not use Protected field, so need to check MMIE */
Joe Perchesf64f9e72009-11-29 16:55:45 -08001834 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02001835 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
Johannes Berg6ff57cf2013-05-16 00:55:00 +02001836 if (ieee80211_is_deauth(fc) ||
1837 ieee80211_is_disassoc(fc))
1838 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1839 rx->skb->data,
1840 rx->skb->len);
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001841 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02001842 }
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001843 /*
1844 * When using MFP, Action frames are not allowed prior to
1845 * having configured keys.
1846 */
1847 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1848 ieee80211_is_robust_mgmt_frame(
1849 (struct ieee80211_hdr *) rx->skb->data)))
1850 return -EACCES;
1851 }
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001852
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001853 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001854}
1855
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001856static int
Felix Fietkau4114fa22011-04-12 19:15:22 +02001857__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
Johannes Berg571ecf62007-07-27 15:43:22 +02001858{
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01001859 struct ieee80211_sub_if_data *sdata = rx->sdata;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001860 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001861 bool check_port_control = false;
1862 struct ethhdr *ehdr;
1863 int ret;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001864
Felix Fietkau4114fa22011-04-12 19:15:22 +02001865 *port_control = false;
Johannes Berg9bc383d2009-11-19 11:55:19 +01001866 if (ieee80211_has_a4(hdr->frame_control) &&
1867 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001868 return -1;
Johannes Berg9bc383d2009-11-19 11:55:19 +01001869
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001870 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1871 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1872
1873 if (!sdata->u.mgd.use_4addr)
1874 return -1;
1875 else
1876 check_port_control = true;
1877 }
1878
Johannes Berg9bc383d2009-11-19 11:55:19 +01001879 if (is_multicast_ether_addr(hdr->addr1) &&
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001880 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001881 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001882
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001883 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
Felix Fietkau4114fa22011-04-12 19:15:22 +02001884 if (ret < 0)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001885 return ret;
1886
1887 ehdr = (struct ethhdr *) rx->skb->data;
Felix Fietkau4114fa22011-04-12 19:15:22 +02001888 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1889 *port_control = true;
1890 else if (check_port_control)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001891 return -1;
1892
1893 return 0;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001894}
Johannes Berg571ecf62007-07-27 15:43:22 +02001895
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001896/*
1897 * requires that rx->skb is a frame with ethernet header
1898 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001899static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001900{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301901 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001902 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1903 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1904
1905 /*
1906 * Allow EAPOL frames to us/the PAE group address regardless
1907 * of whether the frame was encrypted or not.
1908 */
Johannes Berga621fa42010-08-27 14:26:54 +03001909 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
Joe Perches3bc79452012-05-08 18:56:53 +00001910 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1911 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001912 return true;
1913
1914 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07001915 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001916 return false;
1917
1918 return true;
1919}
1920
1921/*
1922 * requires that rx->skb is a frame with ethernet header
1923 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001924static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01001925ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001926{
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01001927 struct ieee80211_sub_if_data *sdata = rx->sdata;
1928 struct net_device *dev = sdata->dev;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001929 struct sk_buff *skb, *xmit_skb;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001930 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1931 struct sta_info *dsta;
Johannes Berg554891e2010-09-24 12:38:25 +02001932 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001933
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001934 skb = rx->skb;
1935 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001936
Johannes Berg05c914f2008-09-11 00:01:58 +02001937 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1938 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02001939 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg554891e2010-09-24 12:38:25 +02001940 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
Johannes Berg9bc383d2009-11-19 11:55:19 +01001941 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001942 if (is_multicast_ether_addr(ehdr->h_dest)) {
1943 /*
1944 * send multicast frames both to higher layers in
1945 * local net stack and back to the wireless medium
1946 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001947 xmit_skb = skb_copy(skb, GFP_ATOMIC);
Joe Perchese87cc472012-05-13 21:56:26 +00001948 if (!xmit_skb)
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001949 net_info_ratelimited("%s: failed to clone multicast frame\n",
Joe Perchese87cc472012-05-13 21:56:26 +00001950 dev->name);
Johannes Berg571ecf62007-07-27 15:43:22 +02001951 } else {
Johannes Bergabe60632009-11-25 17:46:18 +01001952 dsta = sta_info_get(sdata, skb->data);
1953 if (dsta) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001954 /*
1955 * The destination station is associated to
1956 * this AP (in this VLAN), so send the frame
1957 * directly to it and do not pass it to local
1958 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02001959 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001960 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001961 skb = NULL;
1962 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001963 }
1964 }
1965
Kalle Valo59d9cb02009-12-17 13:54:57 +01001966#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
Johannes Berg9e890a1f2013-12-04 09:16:31 +01001967 if (skb) {
1968 /* 'align' will only take the values 0 or 2 here since all
1969 * frames are required to be aligned to 2-byte boundaries
1970 * when being passed to mac80211; the code here works just
1971 * as well if that isn't true, but mac80211 assumes it can
1972 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
Johannes Bergd1c3a372009-01-07 00:26:10 +01001973 */
Johannes Berg9e890a1f2013-12-04 09:16:31 +01001974 int align;
1975
1976 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01001977 if (align) {
1978 if (WARN_ON(skb_headroom(skb) < 3)) {
1979 dev_kfree_skb(skb);
1980 skb = NULL;
1981 } else {
1982 u8 *data = skb->data;
Zhu Yi8ce0b582009-10-28 13:13:52 -07001983 size_t len = skb_headlen(skb);
1984 skb->data -= align;
1985 memmove(skb->data, data, len);
1986 skb_set_tail_pointer(skb, len);
Johannes Bergd1c3a372009-01-07 00:26:10 +01001987 }
1988 }
Johannes Berg9e890a1f2013-12-04 09:16:31 +01001989 }
Johannes Bergd1c3a372009-01-07 00:26:10 +01001990#endif
1991
Johannes Berg9e890a1f2013-12-04 09:16:31 +01001992 if (skb) {
1993 /* deliver to local stack */
1994 skb->protocol = eth_type_trans(skb, dev);
1995 memset(skb->cb, 0, sizeof(skb->cb));
1996 netif_receive_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001997 }
1998
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001999 if (xmit_skb) {
Helmut Schaaaef6c922011-12-21 09:11:35 +01002000 /*
2001 * Send to wireless media and increase priority by 256 to
2002 * keep the received priority instead of reclassifying
2003 * the frame (see cfg80211_classify8021d).
2004 */
2005 xmit_skb->priority += 256;
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09002006 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002007 skb_reset_network_header(xmit_skb);
2008 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002009 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002010 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002011}
2012
Johannes Berg49461622008-06-30 15:10:45 +02002013static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002014ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002015{
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01002016 struct net_device *dev = rx->sdata->dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08002017 struct sk_buff *skb = rx->skb;
Harvey Harrison358c8d92008-07-15 18:44:13 -07002018 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2019 __le16 fc = hdr->frame_control;
Zhu Yieaf85ca2009-12-01 10:18:37 +08002020 struct sk_buff_head frame_list;
Johannes Berg554891e2010-09-24 12:38:25 +02002021 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002022
Harvey Harrison358c8d92008-07-15 18:44:13 -07002023 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002024 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002025
Harvey Harrison358c8d92008-07-15 18:44:13 -07002026 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002027 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002028
Johannes Berg554891e2010-09-24 12:38:25 +02002029 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002030 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002031
Zhu Yieaf85ca2009-12-01 10:18:37 +08002032 if (ieee80211_has_a4(hdr->frame_control) &&
2033 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2034 !rx->sdata->u.vlan.sta)
2035 return RX_DROP_UNUSABLE;
2036
2037 if (is_multicast_ether_addr(hdr->addr1) &&
2038 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2039 rx->sdata->u.vlan.sta) ||
2040 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2041 rx->sdata->u.mgd.use_4addr)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002042 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002043
2044 skb->dev = dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08002045 __skb_queue_head_init(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002046
Zhu Yie3cf8b32010-03-29 17:35:07 +08002047 if (skb_linearize(skb))
2048 return RX_DROP_UNUSABLE;
2049
Zhu Yieaf85ca2009-12-01 10:18:37 +08002050 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2051 rx->sdata->vif.type,
Yogesh Ashok Powar8b3beca2011-05-13 11:22:31 -07002052 rx->local->hw.extra_tx_headroom, true);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002053
Zhu Yieaf85ca2009-12-01 10:18:37 +08002054 while (!skb_queue_empty(&frame_list)) {
2055 rx->skb = __skb_dequeue(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002056
Harvey Harrison358c8d92008-07-15 18:44:13 -07002057 if (!ieee80211_frame_allowed(rx, fc)) {
Zhu Yieaf85ca2009-12-01 10:18:37 +08002058 dev_kfree_skb(rx->skb);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002059 continue;
2060 }
Zhu Yieaf85ca2009-12-01 10:18:37 +08002061 dev->stats.rx_packets++;
2062 dev->stats.rx_bytes += rx->skb->len;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002063
2064 ieee80211_deliver_skb(rx);
2065 }
2066
Johannes Berg9ae54c82008-01-31 19:48:20 +01002067 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002068}
2069
Ingo Molnarbf94e172008-10-12 23:51:38 -07002070#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02002071static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002072ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2073{
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002074 struct ieee80211_hdr *fwd_hdr, *hdr;
2075 struct ieee80211_tx_info *info;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002076 struct ieee80211s_hdr *mesh_hdr;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002077 struct sk_buff *skb = rx->skb, *fwd_skb;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002078 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01002079 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02002080 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002081 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002082 u16 q, hdrlen;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002083
2084 hdr = (struct ieee80211_hdr *) skb->data;
2085 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg9b395bc2012-10-26 00:36:40 +02002086
2087 /* make sure fixed part of mesh header is there, also checks skb len */
2088 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2089 return RX_DROP_MONITOR;
2090
2091 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2092
2093 /* make sure full mesh header is there, also checks skb len */
2094 if (!pskb_may_pull(rx->skb,
2095 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2096 return RX_DROP_MONITOR;
2097
2098 /* reload pointers */
2099 hdr = (struct ieee80211_hdr *) skb->data;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002100 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2101
Thomas Pedersen2157fdd2011-09-01 12:32:14 -07002102 /* frame is in RMC, don't forward */
2103 if (ieee80211_is_data(hdr->frame_control) &&
2104 is_multicast_ether_addr(hdr->addr1) &&
Johannes Bergbf7cd942013-02-15 14:40:31 +01002105 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
Thomas Pedersen2157fdd2011-09-01 12:32:14 -07002106 return RX_DROP_MONITOR;
2107
Javier Cardona555cb712012-10-24 12:43:30 -07002108 if (!ieee80211_is_data(hdr->frame_control) ||
2109 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002110 return RX_CONTINUE;
2111
2112 if (!mesh_hdr->ttl)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002113 return RX_DROP_MONITOR;
2114
Javier Cardona43b7b312009-10-15 18:10:51 -07002115 if (mesh_hdr->flags & MESH_FLAGS_AE) {
YanBo79617de2008-09-22 13:30:32 +08002116 struct mesh_path *mppath;
Javier Cardona43b7b312009-10-15 18:10:51 -07002117 char *proxied_addr;
2118 char *mpp_addr;
2119
2120 if (is_multicast_ether_addr(hdr->addr1)) {
2121 mpp_addr = hdr->addr3;
2122 proxied_addr = mesh_hdr->eaddr1;
Johannes Berg9b395bc2012-10-26 00:36:40 +02002123 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2124 /* has_a4 already checked in ieee80211_rx_mesh_check */
Javier Cardona43b7b312009-10-15 18:10:51 -07002125 mpp_addr = hdr->addr4;
2126 proxied_addr = mesh_hdr->eaddr2;
Johannes Berg9b395bc2012-10-26 00:36:40 +02002127 } else {
2128 return RX_DROP_MONITOR;
Javier Cardona43b7b312009-10-15 18:10:51 -07002129 }
YanBo79617de2008-09-22 13:30:32 +08002130
YanBo79617de2008-09-22 13:30:32 +08002131 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +01002132 mppath = mpp_path_lookup(sdata, proxied_addr);
YanBo79617de2008-09-22 13:30:32 +08002133 if (!mppath) {
Johannes Bergbf7cd942013-02-15 14:40:31 +01002134 mpp_path_add(sdata, proxied_addr, mpp_addr);
YanBo79617de2008-09-22 13:30:32 +08002135 } else {
2136 spin_lock_bh(&mppath->state_lock);
Joe Perchesb203ca32012-05-08 18:56:52 +00002137 if (!ether_addr_equal(mppath->mpp, mpp_addr))
Javier Cardona43b7b312009-10-15 18:10:51 -07002138 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
YanBo79617de2008-09-22 13:30:32 +08002139 spin_unlock_bh(&mppath->state_lock);
2140 }
2141 rcu_read_unlock();
2142 }
2143
Javier Cardona3c5772a2009-08-10 12:15:48 -07002144 /* Frame has reached destination. Don't forward */
2145 if (!is_multicast_ether_addr(hdr->addr1) &&
Joe Perchesb203ca32012-05-08 18:56:52 +00002146 ether_addr_equal(sdata->vif.addr, hdr->addr3))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002147 return RX_CONTINUE;
2148
Yoni Divinsky00e96de2012-06-20 15:39:13 +03002149 q = ieee80211_select_queue_80211(sdata, skb, hdr);
Thomas Pedersend3c15972011-11-24 17:15:23 -08002150 if (ieee80211_queue_stopped(&local->hw, q)) {
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002151 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
Thomas Pedersend3c15972011-11-24 17:15:23 -08002152 return RX_DROP_MONITOR;
2153 }
2154 skb_set_queue_mapping(skb, q);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002155
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002156 if (!--mesh_hdr->ttl) {
2157 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
Javier Cardona2ac64cd2012-10-24 12:43:31 -07002158 goto out;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002159 }
2160
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +08002161 if (!ifmsh->mshcfg.dot11MeshForwarding)
2162 goto out;
2163
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002164 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2165 if (!fwd_skb) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02002166 net_info_ratelimited("%s: failed to clone mesh frame\n",
Joe Perchese87cc472012-05-13 21:56:26 +00002167 sdata->name);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002168 goto out;
2169 }
2170
2171 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
Thomas Pedersen9d6d6f42013-04-08 11:06:12 -07002172 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002173 info = IEEE80211_SKB_CB(fwd_skb);
2174 memset(info, 0, sizeof(*info));
2175 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2176 info->control.vif = &rx->sdata->vif;
2177 info->control.jiffies = jiffies;
2178 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2179 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2180 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
Marco Porsch3f52b7e2013-01-30 18:14:08 +01002181 /* update power mode indication when forwarding */
2182 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
Johannes Bergbf7cd942013-02-15 14:40:31 +01002183 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
Marco Porsch3f52b7e2013-01-30 18:14:08 +01002184 /* mesh power mode flags updated in mesh_nexthop_lookup */
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002185 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2186 } else {
2187 /* unable to resolve next hop */
Johannes Bergbf7cd942013-02-15 14:40:31 +01002188 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +08002189 fwd_hdr->addr3, 0,
2190 WLAN_REASON_MESH_PATH_NOFORWARD,
2191 fwd_hdr->addr2);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002192 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
Jesper Juhl74b8cc32012-01-14 21:52:17 +01002193 kfree_skb(fwd_skb);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002194 return RX_DROP_MONITOR;
2195 }
2196
2197 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2198 ieee80211_add_pending_skb(local, fwd_skb);
Johannes Bergb51aff02010-12-22 10:15:07 +01002199 out:
Javier Cardona3c5772a2009-08-10 12:15:48 -07002200 if (is_multicast_ether_addr(hdr->addr1) ||
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01002201 sdata->dev->flags & IFF_PROMISC)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002202 return RX_CONTINUE;
2203 else
2204 return RX_DROP_MONITOR;
2205}
Ingo Molnarbf94e172008-10-12 23:51:38 -07002206#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002207
2208static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002209ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002210{
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01002211 struct ieee80211_sub_if_data *sdata = rx->sdata;
Vivek Natarajane15276a2010-02-08 17:47:01 +05302212 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01002213 struct net_device *dev = sdata->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07002214 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2215 __le16 fc = hdr->frame_control;
Felix Fietkau4114fa22011-04-12 19:15:22 +02002216 bool port_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002217 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002218
Harvey Harrison358c8d92008-07-15 18:44:13 -07002219 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002220 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002221
Harvey Harrison358c8d92008-07-15 18:44:13 -07002222 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002223 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002224
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002225 /*
Johannes Berge7f4a942011-11-04 11:18:20 +01002226 * Send unexpected-4addr-frame event to hostapd. For older versions,
2227 * also drop the frame to cooked monitor interfaces.
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002228 */
2229 if (ieee80211_has_a4(hdr->frame_control) &&
Johannes Berge7f4a942011-11-04 11:18:20 +01002230 sdata->vif.type == NL80211_IFTYPE_AP) {
2231 if (rx->sta &&
2232 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2233 cfg80211_rx_unexpected_4addr_frame(
2234 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002235 return RX_DROP_MONITOR;
Johannes Berge7f4a942011-11-04 11:18:20 +01002236 }
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002237
Felix Fietkau4114fa22011-04-12 19:15:22 +02002238 err = __ieee80211_data_to_8023(rx, &port_control);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002239 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002240 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002241
Harvey Harrison358c8d92008-07-15 18:44:13 -07002242 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002243 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002244
Felix Fietkau4114fa22011-04-12 19:15:22 +02002245 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2246 unlikely(port_control) && sdata->bss) {
2247 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2248 u.ap);
2249 dev = sdata->dev;
2250 rx->sdata = sdata;
2251 }
2252
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002253 rx->skb->dev = dev;
2254
2255 dev->stats.rx_packets++;
2256 dev->stats.rx_bytes += rx->skb->len;
2257
Helmut Schaa08ca9442010-11-30 12:19:34 +01002258 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
Rajkumar Manoharan8c99f692011-02-02 22:57:53 +05302259 !is_multicast_ether_addr(
2260 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2261 (!local->scanning &&
2262 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
Vivek Natarajane15276a2010-02-08 17:47:01 +05302263 mod_timer(&local->dynamic_ps_timer, jiffies +
2264 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2265 }
2266
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002267 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02002268
Johannes Berg9ae54c82008-01-31 19:48:20 +01002269 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002270}
2271
Johannes Berg49461622008-06-30 15:10:45 +02002272static ieee80211_rx_result debug_noinline
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002273ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
Ron Rindjunsky71364712007-12-25 17:00:36 +02002274{
Ron Rindjunsky71364712007-12-25 17:00:36 +02002275 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002276 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002277 struct tid_ampdu_rx *tid_agg_rx;
2278 u16 start_seq_num;
2279 u16 tid;
2280
Harvey Harrisona7767f92008-07-02 16:30:51 -07002281 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002282 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002283
Harvey Harrisona7767f92008-07-02 16:30:51 -07002284 if (ieee80211_is_back_req(bar->frame_control)) {
Johannes Berg8ae59772010-05-30 14:52:58 +02002285 struct {
2286 __le16 control, start_seq_num;
2287 } __packed bar_data;
2288
Ron Rindjunsky71364712007-12-25 17:00:36 +02002289 if (!rx->sta)
Johannes Berga02ae752009-11-16 12:00:40 +01002290 return RX_DROP_MONITOR;
Johannes Berg8ae59772010-05-30 14:52:58 +02002291
2292 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2293 &bar_data, sizeof(bar_data)))
2294 return RX_DROP_MONITOR;
2295
Johannes Berg8ae59772010-05-30 14:52:58 +02002296 tid = le16_to_cpu(bar_data.control) >> 12;
Johannes Berga87f7362010-06-10 10:21:38 +02002297
2298 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2299 if (!tid_agg_rx)
Johannes Berga02ae752009-11-16 12:00:40 +01002300 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002301
Johannes Berg8ae59772010-05-30 14:52:58 +02002302 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002303
2304 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01002305 if (tid_agg_rx->timeout)
2306 mod_timer(&tid_agg_rx->session_timer,
2307 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02002308
Johannes Bergdd318572010-11-29 11:09:16 +01002309 spin_lock(&tid_agg_rx->reorder_lock);
Johannes Berga02ae752009-11-16 12:00:40 +01002310 /* release stored frames up to start of BAR */
Johannes Bergd3b2fb52012-06-22 12:48:38 +02002311 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002312 start_seq_num, frames);
Johannes Bergdd318572010-11-29 11:09:16 +01002313 spin_unlock(&tid_agg_rx->reorder_lock);
2314
Johannes Berga02ae752009-11-16 12:00:40 +01002315 kfree_skb(skb);
2316 return RX_QUEUED;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002317 }
2318
Johannes Berg08daeca2010-05-30 14:53:43 +02002319 /*
2320 * After this point, we only want management frames,
2321 * so we can drop all remaining control frames to
2322 * cooked monitor interfaces.
2323 */
2324 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002325}
2326
Jouni Malinenf4f727a2009-01-10 11:46:53 +02002327static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2328 struct ieee80211_mgmt *mgmt,
2329 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02002330{
2331 struct ieee80211_local *local = sdata->local;
2332 struct sk_buff *skb;
2333 struct ieee80211_mgmt *resp;
2334
Joe Perchesb203ca32012-05-08 18:56:52 +00002335 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
Jouni Malinenfea14732009-01-08 13:32:06 +02002336 /* Not to own unicast address */
2337 return;
2338 }
2339
Joe Perchesb203ca32012-05-08 18:56:52 +00002340 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2341 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
Johannes Berg77fdaa12009-07-07 03:45:17 +02002342 /* Not from the current AP or not associated yet. */
Jouni Malinenfea14732009-01-08 13:32:06 +02002343 return;
2344 }
2345
2346 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2347 /* Too short SA Query request frame */
2348 return;
2349 }
2350
2351 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2352 if (skb == NULL)
2353 return;
2354
2355 skb_reserve(skb, local->hw.extra_tx_headroom);
2356 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2357 memset(resp, 0, 24);
2358 memcpy(resp->da, mgmt->sa, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01002359 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01002360 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02002361 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2362 IEEE80211_STYPE_ACTION);
2363 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2364 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2365 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2366 memcpy(resp->u.action.u.sa_query.trans_id,
2367 mgmt->u.action.u.sa_query.trans_id,
2368 WLAN_SA_QUERY_TR_ID_LEN);
2369
Johannes Berg62ae67b2009-11-18 18:42:05 +01002370 ieee80211_tx_skb(sdata, skb);
Jouni Malinenfea14732009-01-08 13:32:06 +02002371}
2372
Johannes Berg49461622008-06-30 15:10:45 +02002373static ieee80211_rx_result debug_noinline
Johannes Berg2e161f72010-08-12 15:38:38 +02002374ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2375{
2376 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002377 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002378
2379 /*
2380 * From here on, look only at management frames.
2381 * Data and control frames are already handled,
2382 * and unknown (reserved) frames are useless.
2383 */
2384 if (rx->skb->len < 24)
2385 return RX_DROP_MONITOR;
2386
2387 if (!ieee80211_is_mgmt(mgmt->frame_control))
2388 return RX_DROP_MONITOR;
2389
Johannes Bergee971922011-11-04 11:18:18 +01002390 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2391 ieee80211_is_beacon(mgmt->frame_control) &&
2392 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
Johannes Berg804483e2012-03-05 22:18:41 +01002393 int sig = 0;
2394
2395 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2396 sig = status->signal;
2397
Johannes Bergee971922011-11-04 11:18:18 +01002398 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2399 rx->skb->data, rx->skb->len,
Ben Greear37c73b52012-10-26 14:49:25 -07002400 status->freq, sig);
Johannes Bergee971922011-11-04 11:18:18 +01002401 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2402 }
2403
Johannes Berg554891e2010-09-24 12:38:25 +02002404 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg2e161f72010-08-12 15:38:38 +02002405 return RX_DROP_MONITOR;
2406
2407 if (ieee80211_drop_unencrypted_mgmt(rx))
2408 return RX_DROP_UNUSABLE;
2409
2410 return RX_CONTINUE;
2411}
2412
2413static ieee80211_rx_result debug_noinline
Johannes Bergde1ede72008-09-09 14:42:50 +02002414ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2415{
2416 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01002417 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergde1ede72008-09-09 14:42:50 +02002418 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002419 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergde1ede72008-09-09 14:42:50 +02002420 int len = rx->skb->len;
2421
2422 if (!ieee80211_is_action(mgmt->frame_control))
2423 return RX_CONTINUE;
2424
Jouni Malinen026331c2010-02-15 12:53:10 +02002425 /* drop too small frames */
2426 if (len < IEEE80211_MIN_ACTION_SIZE)
2427 return RX_DROP_UNUSABLE;
2428
Marco Porsch815b8092012-12-05 15:04:26 -08002429 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002430 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2431 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
Johannes Berg84040802010-02-15 12:46:39 +02002432 return RX_DROP_UNUSABLE;
Johannes Bergde1ede72008-09-09 14:42:50 +02002433
Johannes Berg554891e2010-09-24 12:38:25 +02002434 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg84040802010-02-15 12:46:39 +02002435 return RX_DROP_UNUSABLE;
Johannes Bergde1ede72008-09-09 14:42:50 +02002436
Johannes Bergde1ede72008-09-09 14:42:50 +02002437 switch (mgmt->u.action.category) {
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002438 case WLAN_CATEGORY_HT:
2439 /* reject HT action frames from stations not supporting HT */
2440 if (!rx->sta->sta.ht_cap.ht_supported)
2441 goto invalid;
2442
2443 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2444 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2445 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2446 sdata->vif.type != NL80211_IFTYPE_AP &&
2447 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2448 break;
2449
Johannes Bergec61cd62012-12-28 12:12:10 +01002450 /* verify action & smps_control/chanwidth are present */
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002451 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2452 goto invalid;
2453
2454 switch (mgmt->u.action.u.ht_smps.action) {
2455 case WLAN_HT_ACTION_SMPS: {
2456 struct ieee80211_supported_band *sband;
Johannes Bergaf0ed692013-02-12 14:21:00 +01002457 enum ieee80211_smps_mode smps_mode;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002458
2459 /* convert to HT capability */
2460 switch (mgmt->u.action.u.ht_smps.smps_control) {
2461 case WLAN_HT_SMPS_CONTROL_DISABLED:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002462 smps_mode = IEEE80211_SMPS_OFF;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002463 break;
2464 case WLAN_HT_SMPS_CONTROL_STATIC:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002465 smps_mode = IEEE80211_SMPS_STATIC;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002466 break;
2467 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002468 smps_mode = IEEE80211_SMPS_DYNAMIC;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002469 break;
2470 default:
2471 goto invalid;
2472 }
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002473
2474 /* if no change do nothing */
Johannes Bergaf0ed692013-02-12 14:21:00 +01002475 if (rx->sta->sta.smps_mode == smps_mode)
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002476 goto handled;
Johannes Bergaf0ed692013-02-12 14:21:00 +01002477 rx->sta->sta.smps_mode = smps_mode;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002478
2479 sband = rx->local->hw.wiphy->bands[status->band];
2480
Johannes Berg64f68e52012-03-28 10:58:37 +02002481 rate_control_rate_update(local, sband, rx->sta,
2482 IEEE80211_RC_SMPS_CHANGED);
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002483 goto handled;
2484 }
Johannes Bergec61cd62012-12-28 12:12:10 +01002485 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2486 struct ieee80211_supported_band *sband;
2487 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002488 enum ieee80211_sta_rx_bandwidth new_bw;
Johannes Bergec61cd62012-12-28 12:12:10 +01002489
2490 /* If it doesn't support 40 MHz it can't change ... */
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002491 if (!(rx->sta->sta.ht_cap.cap &
2492 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
Johannes Bergec61cd62012-12-28 12:12:10 +01002493 goto handled;
2494
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002495 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2496 new_bw = IEEE80211_STA_RX_BW_20;
Johannes Bergec61cd62012-12-28 12:12:10 +01002497 else
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002498 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2499
2500 if (rx->sta->sta.bandwidth == new_bw)
2501 goto handled;
Johannes Bergec61cd62012-12-28 12:12:10 +01002502
2503 sband = rx->local->hw.wiphy->bands[status->band];
2504
2505 rate_control_rate_update(local, sband, rx->sta,
2506 IEEE80211_RC_BW_CHANGED);
2507 goto handled;
2508 }
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002509 default:
2510 goto invalid;
2511 }
2512
2513 break;
Johannes Berg1b3a2e42013-03-26 15:17:18 +01002514 case WLAN_CATEGORY_PUBLIC:
2515 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2516 goto invalid;
2517 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2518 break;
2519 if (!rx->sta)
2520 break;
2521 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2522 break;
2523 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2524 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2525 break;
2526 if (len < offsetof(struct ieee80211_mgmt,
2527 u.action.u.ext_chan_switch.variable))
2528 goto invalid;
2529 goto queue;
Johannes Berg0af83d32012-12-27 18:55:36 +01002530 case WLAN_CATEGORY_VHT:
2531 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2532 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2533 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2534 sdata->vif.type != NL80211_IFTYPE_AP &&
2535 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2536 break;
2537
2538 /* verify action code is present */
2539 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2540 goto invalid;
2541
2542 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2543 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2544 u8 opmode;
2545
2546 /* verify opmode is present */
2547 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2548 goto invalid;
2549
2550 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2551
2552 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
Johannes Bergbee7f582013-02-07 22:24:55 +01002553 opmode, status->band,
2554 false);
Johannes Berg0af83d32012-12-27 18:55:36 +01002555 goto handled;
2556 }
2557 default:
2558 break;
2559 }
2560 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002561 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01002562 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
Thomas Pedersenae2772b2011-10-26 14:47:29 -07002563 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
Johannes Berg8abd3f92009-02-10 21:25:47 +01002564 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
Alexander Simon13c40c52011-11-30 16:56:34 +01002565 sdata->vif.type != NL80211_IFTYPE_AP &&
2566 sdata->vif.type != NL80211_IFTYPE_ADHOC)
Johannes Berg84040802010-02-15 12:46:39 +02002567 break;
Johannes Berg8abd3f92009-02-10 21:25:47 +01002568
Jouni Malinen026331c2010-02-15 12:53:10 +02002569 /* verify action_code is present */
2570 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2571 break;
2572
Johannes Bergde1ede72008-09-09 14:42:50 +02002573 switch (mgmt->u.action.u.addba_req.action_code) {
2574 case WLAN_ACTION_ADDBA_REQ:
2575 if (len < (IEEE80211_MIN_ACTION_SIZE +
2576 sizeof(mgmt->u.action.u.addba_req)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002577 goto invalid;
2578 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002579 case WLAN_ACTION_ADDBA_RESP:
2580 if (len < (IEEE80211_MIN_ACTION_SIZE +
2581 sizeof(mgmt->u.action.u.addba_resp)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002582 goto invalid;
2583 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002584 case WLAN_ACTION_DELBA:
2585 if (len < (IEEE80211_MIN_ACTION_SIZE +
2586 sizeof(mgmt->u.action.u.delba)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002587 goto invalid;
2588 break;
2589 default:
2590 goto invalid;
Johannes Bergde1ede72008-09-09 14:42:50 +02002591 }
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002592
Johannes Berg8b58ff82010-06-10 10:21:51 +02002593 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002594 case WLAN_CATEGORY_SPECTRUM_MGMT:
Jouni Malinen026331c2010-02-15 12:53:10 +02002595 /* verify action_code is present */
2596 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2597 break;
2598
Johannes Berg39192c02008-09-09 14:49:03 +02002599 switch (mgmt->u.action.u.measurement.action_code) {
2600 case WLAN_ACTION_SPCT_MSR_REQ:
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002601 if (status->band != IEEE80211_BAND_5GHZ)
2602 break;
2603
Johannes Berg39192c02008-09-09 14:49:03 +02002604 if (len < (IEEE80211_MIN_ACTION_SIZE +
2605 sizeof(mgmt->u.action.u.measurement)))
Johannes Berg84040802010-02-15 12:46:39 +02002606 break;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002607
Johannes Bergcc32abd2009-05-15 11:52:31 +02002608 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002609 break;
Johannes Bergcc32abd2009-05-15 11:52:31 +02002610
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002611 ieee80211_process_measurement_req(sdata, mgmt, len);
2612 goto handled;
2613 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2614 u8 *bssid;
2615 if (len < (IEEE80211_MIN_ACTION_SIZE +
2616 sizeof(mgmt->u.action.u.chan_switch)))
2617 break;
2618
2619 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07002620 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2621 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002622 break;
2623
2624 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2625 bssid = sdata->u.mgd.bssid;
2626 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2627 bssid = sdata->u.ibss.bssid;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07002628 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2629 bssid = mgmt->sa;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002630 else
2631 break;
2632
2633 if (!ether_addr_equal(mgmt->bssid, bssid))
Johannes Berg84040802010-02-15 12:46:39 +02002634 break;
Sujithc481ec92009-01-06 09:28:37 +05302635
Johannes Berg8b58ff82010-06-10 10:21:51 +02002636 goto queue;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002637 }
Johannes Berg39192c02008-09-09 14:49:03 +02002638 }
2639 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002640 case WLAN_CATEGORY_SA_QUERY:
2641 if (len < (IEEE80211_MIN_ACTION_SIZE +
2642 sizeof(mgmt->u.action.u.sa_query)))
Johannes Berg84040802010-02-15 12:46:39 +02002643 break;
2644
Jouni Malinenfea14732009-01-08 13:32:06 +02002645 switch (mgmt->u.action.u.sa_query.action) {
2646 case WLAN_ACTION_SA_QUERY_REQUEST:
2647 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002648 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002649 ieee80211_process_sa_query_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002650 goto handled;
Jouni Malinenfea14732009-01-08 13:32:06 +02002651 }
2652 break;
Thomas Pedersen8db09852011-08-12 20:01:00 -07002653 case WLAN_CATEGORY_SELF_PROTECTED:
Johannes Berg9b395bc2012-10-26 00:36:40 +02002654 if (len < (IEEE80211_MIN_ACTION_SIZE +
2655 sizeof(mgmt->u.action.u.self_prot.action_code)))
2656 break;
2657
Thomas Pedersen8db09852011-08-12 20:01:00 -07002658 switch (mgmt->u.action.u.self_prot.action_code) {
2659 case WLAN_SP_MESH_PEERING_OPEN:
2660 case WLAN_SP_MESH_PEERING_CLOSE:
2661 case WLAN_SP_MESH_PEERING_CONFIRM:
2662 if (!ieee80211_vif_is_mesh(&sdata->vif))
2663 goto invalid;
Thomas Pedersena6dad6a2013-03-04 13:06:12 -08002664 if (sdata->u.mesh.user_mpm)
Thomas Pedersen8db09852011-08-12 20:01:00 -07002665 /* userspace handles this frame */
2666 break;
2667 goto queue;
2668 case WLAN_SP_MGK_INFORM:
2669 case WLAN_SP_MGK_ACK:
2670 if (!ieee80211_vif_is_mesh(&sdata->vif))
2671 goto invalid;
2672 break;
2673 }
2674 break;
Javier Cardonad3aaec8a2011-05-03 16:57:09 -07002675 case WLAN_CATEGORY_MESH_ACTION:
Johannes Berg9b395bc2012-10-26 00:36:40 +02002676 if (len < (IEEE80211_MIN_ACTION_SIZE +
2677 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2678 break;
2679
Johannes Berg77a121c2010-06-10 10:21:34 +02002680 if (!ieee80211_vif_is_mesh(&sdata->vif))
2681 break;
Thomas Pedersen25d49e42011-08-11 19:35:15 -07002682 if (mesh_action_is_path_sel(mgmt) &&
Johannes Berg1df332e2012-10-26 00:09:11 +02002683 !mesh_path_sel_is_hwmp(sdata))
Javier Cardonac7108a72010-12-16 17:37:50 -08002684 break;
2685 goto queue;
Johannes Berg84040802010-02-15 12:46:39 +02002686 }
Jouni Malinen026331c2010-02-15 12:53:10 +02002687
Johannes Berg2e161f72010-08-12 15:38:38 +02002688 return RX_CONTINUE;
2689
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002690 invalid:
Johannes Berg554891e2010-09-24 12:38:25 +02002691 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
Johannes Berg2e161f72010-08-12 15:38:38 +02002692 /* will return in the next handlers */
2693 return RX_CONTINUE;
2694
2695 handled:
2696 if (rx->sta)
2697 rx->sta->rx_packets++;
2698 dev_kfree_skb(rx->skb);
2699 return RX_QUEUED;
2700
2701 queue:
2702 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2703 skb_queue_tail(&sdata->skb_queue, rx->skb);
2704 ieee80211_queue_work(&local->hw, &sdata->work);
2705 if (rx->sta)
2706 rx->sta->rx_packets++;
2707 return RX_QUEUED;
2708}
2709
2710static ieee80211_rx_result debug_noinline
2711ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2712{
Johannes Berg554891e2010-09-24 12:38:25 +02002713 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg804483e2012-03-05 22:18:41 +01002714 int sig = 0;
Johannes Berg2e161f72010-08-12 15:38:38 +02002715
2716 /* skip known-bad action frames and return them in the next handler */
Johannes Berg554891e2010-09-24 12:38:25 +02002717 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
Johannes Berg2e161f72010-08-12 15:38:38 +02002718 return RX_CONTINUE;
Felix Fietkaud7907442010-01-07 20:23:53 +01002719
Jouni Malinen026331c2010-02-15 12:53:10 +02002720 /*
2721 * Getting here means the kernel doesn't know how to handle
2722 * it, but maybe userspace does ... include returned frames
2723 * so userspace can register for those to know whether ones
2724 * it transmitted were processed or returned.
2725 */
Jouni Malinen026331c2010-02-15 12:53:10 +02002726
Johannes Berg804483e2012-03-05 22:18:41 +01002727 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2728 sig = status->signal;
2729
Johannes Berg71bbc992012-06-15 15:30:18 +02002730 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
Vladimir Kondratiev19504cf2013-08-15 14:51:28 +03002731 rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) {
Johannes Berg2e161f72010-08-12 15:38:38 +02002732 if (rx->sta)
2733 rx->sta->rx_packets++;
2734 dev_kfree_skb(rx->skb);
2735 return RX_QUEUED;
2736 }
2737
Johannes Berg2e161f72010-08-12 15:38:38 +02002738 return RX_CONTINUE;
2739}
2740
2741static ieee80211_rx_result debug_noinline
2742ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2743{
2744 struct ieee80211_local *local = rx->local;
2745 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2746 struct sk_buff *nskb;
2747 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02002748 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002749
2750 if (!ieee80211_is_action(mgmt->frame_control))
2751 return RX_CONTINUE;
2752
2753 /*
2754 * For AP mode, hostapd is responsible for handling any action
2755 * frames that we didn't handle, including returning unknown
2756 * ones. For all other modes we will return them to the sender,
2757 * setting the 0x80 bit in the action category, as required by
Johannes Berg4b5ebcc2012-06-27 15:38:56 +02002758 * 802.11-2012 9.24.4.
Johannes Berg2e161f72010-08-12 15:38:38 +02002759 * Newer versions of hostapd shall also use the management frame
2760 * registration mechanisms, but older ones still use cooked
2761 * monitor interfaces so push all frames there.
2762 */
Johannes Berg554891e2010-09-24 12:38:25 +02002763 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
Johannes Berg2e161f72010-08-12 15:38:38 +02002764 (sdata->vif.type == NL80211_IFTYPE_AP ||
2765 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2766 return RX_DROP_MONITOR;
Jouni Malinen026331c2010-02-15 12:53:10 +02002767
Johannes Berg4b5ebcc2012-06-27 15:38:56 +02002768 if (is_multicast_ether_addr(mgmt->da))
2769 return RX_DROP_MONITOR;
2770
Johannes Berg84040802010-02-15 12:46:39 +02002771 /* do not return rejected action frames */
2772 if (mgmt->u.action.category & 0x80)
2773 return RX_DROP_UNUSABLE;
2774
2775 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2776 GFP_ATOMIC);
2777 if (nskb) {
John W. Linville292b4df2010-06-24 11:13:56 -04002778 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
Johannes Berg84040802010-02-15 12:46:39 +02002779
John W. Linville292b4df2010-06-24 11:13:56 -04002780 nmgmt->u.action.category |= 0x80;
2781 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2782 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
Johannes Berg84040802010-02-15 12:46:39 +02002783
2784 memset(nskb->cb, 0, sizeof(nskb->cb));
2785
Johannes Berg07e5a5f2013-03-07 13:22:05 +01002786 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2787 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2788
2789 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2790 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2791 IEEE80211_TX_CTL_NO_CCK_RATE;
2792 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2793 info->hw_queue =
2794 local->hw.offchannel_tx_hw_queue;
2795 }
2796
2797 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2798 status->band);
Johannes Bergde1ede72008-09-09 14:42:50 +02002799 }
Johannes Berg39192c02008-09-09 14:49:03 +02002800 dev_kfree_skb(rx->skb);
2801 return RX_QUEUED;
Johannes Bergde1ede72008-09-09 14:42:50 +02002802}
2803
2804static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002805ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02002806{
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01002807 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg77a121c2010-06-10 10:21:34 +02002808 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2809 __le16 stype;
Johannes Berg571ecf62007-07-27 15:43:22 +02002810
Johannes Berg77a121c2010-06-10 10:21:34 +02002811 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
Johannes Berg472dbc42008-09-11 00:01:49 +02002812
Johannes Berg77a121c2010-06-10 10:21:34 +02002813 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2814 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2815 sdata->vif.type != NL80211_IFTYPE_STATION)
2816 return RX_DROP_MONITOR;
Johannes Bergf9d540e2007-09-28 14:02:09 +02002817
Johannes Berg77a121c2010-06-10 10:21:34 +02002818 switch (stype) {
Johannes Berg66e67e42012-01-20 13:55:27 +01002819 case cpu_to_le16(IEEE80211_STYPE_AUTH):
Johannes Berg77a121c2010-06-10 10:21:34 +02002820 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2821 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2822 /* process for all: mesh, mlme, ibss */
2823 break;
Johannes Berg66e67e42012-01-20 13:55:27 +01002824 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2825 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
Johannes Berg77a121c2010-06-10 10:21:34 +02002826 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2827 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
Christian Lamparter2c313332010-11-29 20:53:23 +01002828 if (is_multicast_ether_addr(mgmt->da) &&
2829 !is_broadcast_ether_addr(mgmt->da))
2830 return RX_DROP_MONITOR;
2831
Johannes Berg77a121c2010-06-10 10:21:34 +02002832 /* process only for station */
2833 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2834 return RX_DROP_MONITOR;
2835 break;
2836 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08002837 /* process only for ibss and mesh */
2838 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2839 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
Johannes Berg77a121c2010-06-10 10:21:34 +02002840 return RX_DROP_MONITOR;
2841 break;
2842 default:
2843 return RX_DROP_MONITOR;
2844 }
Johannes Berg46900292009-02-15 12:44:28 +01002845
Johannes Berg77a121c2010-06-10 10:21:34 +02002846 /* queue up frame and kick off work to process it */
Johannes Bergc1475ca2010-06-10 10:21:37 +02002847 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg77a121c2010-06-10 10:21:34 +02002848 skb_queue_tail(&sdata->skb_queue, rx->skb);
2849 ieee80211_queue_work(&rx->local->hw, &sdata->work);
Johannes Berg8b58ff82010-06-10 10:21:51 +02002850 if (rx->sta)
2851 rx->sta->rx_packets++;
Johannes Berg77a121c2010-06-10 10:21:34 +02002852
2853 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002854}
2855
Johannes Berg5cf121c2008-02-25 16:27:43 +01002856/* TODO: use IEEE80211_RX_FRAGMENTED */
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002857static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2858 struct ieee80211_rate *rate)
Michael Wu3d30d942008-01-31 19:48:27 +01002859{
2860 struct ieee80211_sub_if_data *sdata;
2861 struct ieee80211_local *local = rx->local;
Michael Wu3d30d942008-01-31 19:48:27 +01002862 struct sk_buff *skb = rx->skb, *skb2;
2863 struct net_device *prev_dev = NULL;
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01002864 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg293702a2012-03-02 13:18:19 +01002865 int needed_headroom;
Michael Wu3d30d942008-01-31 19:48:27 +01002866
Johannes Berg554891e2010-09-24 12:38:25 +02002867 /*
2868 * If cooked monitor has been processed already, then
2869 * don't do it again. If not, set the flag.
2870 */
2871 if (rx->flags & IEEE80211_RX_CMNTR)
John W. Linville7c1e1832010-09-24 15:52:49 -04002872 goto out_free_skb;
Johannes Berg554891e2010-09-24 12:38:25 +02002873 rx->flags |= IEEE80211_RX_CMNTR;
John W. Linville7c1e1832010-09-24 15:52:49 -04002874
Johannes Berg152c4772011-10-21 10:22:22 +02002875 /* If there are no cooked monitor interfaces, just free the SKB */
2876 if (!local->cooked_mntrs)
2877 goto out_free_skb;
2878
Johannes Berg293702a2012-03-02 13:18:19 +01002879 /* room for the radiotap header based on driver features */
Johannes Berg90b9e4462012-11-16 10:09:08 +01002880 needed_headroom = ieee80211_rx_radiotap_space(local, status);
Johannes Berg293702a2012-03-02 13:18:19 +01002881
2882 if (skb_headroom(skb) < needed_headroom &&
2883 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
Michael Wu3d30d942008-01-31 19:48:27 +01002884 goto out_free_skb;
2885
Johannes Berg293702a2012-03-02 13:18:19 +01002886 /* prepend radiotap information */
Felix Fietkau973ef212012-04-16 14:56:48 +02002887 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2888 false);
Michael Wu3d30d942008-01-31 19:48:27 +01002889
2890 skb_set_mac_header(skb, 0);
2891 skb->ip_summed = CHECKSUM_UNNECESSARY;
2892 skb->pkt_type = PACKET_OTHERHOST;
2893 skb->protocol = htons(ETH_P_802_2);
2894
2895 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01002896 if (!ieee80211_sdata_running(sdata))
Michael Wu3d30d942008-01-31 19:48:27 +01002897 continue;
2898
Johannes Berg05c914f2008-09-11 00:01:58 +02002899 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Michael Wu3d30d942008-01-31 19:48:27 +01002900 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2901 continue;
2902
2903 if (prev_dev) {
2904 skb2 = skb_clone(skb, GFP_ATOMIC);
2905 if (skb2) {
2906 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04002907 netif_receive_skb(skb2);
Michael Wu3d30d942008-01-31 19:48:27 +01002908 }
2909 }
2910
2911 prev_dev = sdata->dev;
2912 sdata->dev->stats.rx_packets++;
2913 sdata->dev->stats.rx_bytes += skb->len;
2914 }
2915
2916 if (prev_dev) {
2917 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04002918 netif_receive_skb(skb);
Johannes Berg554891e2010-09-24 12:38:25 +02002919 return;
2920 }
Michael Wu3d30d942008-01-31 19:48:27 +01002921
2922 out_free_skb:
2923 dev_kfree_skb(skb);
2924}
2925
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002926static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2927 ieee80211_rx_result res)
2928{
2929 switch (res) {
2930 case RX_DROP_MONITOR:
2931 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2932 if (rx->sta)
2933 rx->sta->rx_dropped++;
2934 /* fall through */
2935 case RX_CONTINUE: {
2936 struct ieee80211_rate *rate = NULL;
2937 struct ieee80211_supported_band *sband;
2938 struct ieee80211_rx_status *status;
2939
2940 status = IEEE80211_SKB_RXCB((rx->skb));
2941
2942 sband = rx->local->hw.wiphy->bands[status->band];
Johannes Berg56146182012-11-09 15:07:02 +01002943 if (!(status->flag & RX_FLAG_HT) &&
2944 !(status->flag & RX_FLAG_VHT))
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002945 rate = &sband->bitrates[status->rate_idx];
2946
2947 ieee80211_rx_cooked_monitor(rx, rate);
2948 break;
2949 }
2950 case RX_DROP_UNUSABLE:
2951 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2952 if (rx->sta)
2953 rx->sta->rx_dropped++;
2954 dev_kfree_skb(rx->skb);
2955 break;
2956 case RX_QUEUED:
2957 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2958 break;
2959 }
2960}
2961
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002962static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2963 struct sk_buff_head *frames)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002964{
2965 ieee80211_rx_result res = RX_DROP_MONITOR;
2966 struct sk_buff *skb;
2967
2968#define CALL_RXH(rxh) \
2969 do { \
2970 res = rxh(rx); \
2971 if (res != RX_CONTINUE) \
2972 goto rxh_next; \
2973 } while (0);
2974
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002975 spin_lock_bh(&rx->local->rx_path_lock);
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002976
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002977 while ((skb = __skb_dequeue(frames))) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002978 /*
2979 * all the other fields are valid across frames
2980 * that belong to an aMPDU since they are on the
2981 * same TID from the same station
2982 */
2983 rx->skb = skb;
2984
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002985 CALL_RXH(ieee80211_rx_h_check_more_data)
Johannes Berg47086fc2011-09-29 16:04:33 +02002986 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002987 CALL_RXH(ieee80211_rx_h_sta_process)
Johan Almbladh86c228a2013-08-14 15:29:46 +02002988 CALL_RXH(ieee80211_rx_h_decrypt)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002989 CALL_RXH(ieee80211_rx_h_defragment)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002990 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2991 /* must be after MMIC verify so header is counted in MPDU mic */
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002992#ifdef CONFIG_MAC80211_MESH
2993 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2994 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2995#endif
Javier Cardona2154c812011-09-07 17:49:53 -07002996 CALL_RXH(ieee80211_rx_h_amsdu)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002997 CALL_RXH(ieee80211_rx_h_data)
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002998
2999 /* special treatment -- needs the queue */
3000 res = ieee80211_rx_h_ctrl(rx, frames);
3001 if (res != RX_CONTINUE)
3002 goto rxh_next;
3003
Johannes Berg2e161f72010-08-12 15:38:38 +02003004 CALL_RXH(ieee80211_rx_h_mgmt_check)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003005 CALL_RXH(ieee80211_rx_h_action)
Johannes Berg2e161f72010-08-12 15:38:38 +02003006 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3007 CALL_RXH(ieee80211_rx_h_action_return)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003008 CALL_RXH(ieee80211_rx_h_mgmt)
3009
3010 rxh_next:
3011 ieee80211_rx_handlers_result(rx, res);
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003012
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003013#undef CALL_RXH
3014 }
Christian Lamparter24a8fda2010-12-30 17:25:29 +01003015
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003016 spin_unlock_bh(&rx->local->rx_path_lock);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003017}
Johannes Berg571ecf62007-07-27 15:43:22 +02003018
Johannes Berg4406c372010-09-24 11:21:06 +02003019static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
Johannes Berg58905292008-01-31 19:48:25 +01003020{
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003021 struct sk_buff_head reorder_release;
Johannes Berg58905292008-01-31 19:48:25 +01003022 ieee80211_rx_result res = RX_DROP_MONITOR;
3023
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003024 __skb_queue_head_init(&reorder_release);
3025
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02003026#define CALL_RXH(rxh) \
3027 do { \
3028 res = rxh(rx); \
3029 if (res != RX_CONTINUE) \
Johannes Berg2569a822009-11-25 17:46:17 +01003030 goto rxh_next; \
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02003031 } while (0);
Johannes Berg58905292008-01-31 19:48:25 +01003032
Johannes Berg49461622008-06-30 15:10:45 +02003033 CALL_RXH(ieee80211_rx_h_check)
Johannes Berg2569a822009-11-25 17:46:17 +01003034
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003035 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
Johannes Berg2569a822009-11-25 17:46:17 +01003036
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003037 ieee80211_rx_handlers(rx, &reorder_release);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003038 return;
Johannes Berg49461622008-06-30 15:10:45 +02003039
Johannes Berg2569a822009-11-25 17:46:17 +01003040 rxh_next:
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003041 ieee80211_rx_handlers_result(rx, res);
3042
3043#undef CALL_RXH
Johannes Berg58905292008-01-31 19:48:25 +01003044}
3045
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003046/*
Johannes Bergdd318572010-11-29 11:09:16 +01003047 * This function makes calls into the RX path, therefore
3048 * it has to be invoked under RCU read lock.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003049 */
3050void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3051{
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003052 struct sk_buff_head frames;
Johannes Berg554891e2010-09-24 12:38:25 +02003053 struct ieee80211_rx_data rx = {
3054 .sta = sta,
3055 .sdata = sta->sdata,
3056 .local = sta->local,
Johannes Berg9e262972011-07-07 18:45:03 +02003057 /* This is OK -- must be QoS data frame */
3058 .security_idx = tid,
3059 .seqno_idx = tid,
Helmut Schaafcf8bd32011-04-01 15:46:05 +02003060 .flags = 0,
Johannes Berg554891e2010-09-24 12:38:25 +02003061 };
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003062 struct tid_ampdu_rx *tid_agg_rx;
3063
3064 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3065 if (!tid_agg_rx)
3066 return;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003067
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003068 __skb_queue_head_init(&frames);
3069
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003070 spin_lock(&tid_agg_rx->reorder_lock);
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003071 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003072 spin_unlock(&tid_agg_rx->reorder_lock);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003073
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003074 ieee80211_rx_handlers(&rx, &frames);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003075}
3076
Johannes Berg571ecf62007-07-27 15:43:22 +02003077/* main receive path */
3078
Johannes Berg3c2723f52014-01-07 16:23:24 +01003079static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3080 struct ieee80211_hdr *hdr)
Johannes Berg23a24de2007-07-27 15:43:22 +02003081{
Johannes Berg20b01f82010-09-24 11:21:05 +02003082 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01003083 struct sk_buff *skb = rx->skb;
3084 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3085 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02003086 int multicast = is_multicast_ether_addr(hdr->addr1);
3087
Johannes Berg51fb61e2007-12-19 01:31:27 +01003088 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02003089 case NL80211_IFTYPE_STATION:
Johannes Berg9bc383d2009-11-19 11:55:19 +01003090 if (!bssid && !sdata->u.mgd.use_4addr)
Johannes Berg3c2723f52014-01-07 16:23:24 +01003091 return false;
Johannes Berg77fdaa12009-07-07 03:45:17 +02003092 if (!multicast &&
Joe Perchesb203ca32012-05-08 18:56:52 +00003093 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
Felix Fietkau4f312332011-02-05 23:48:37 +01003094 if (!(sdata->dev->flags & IFF_PROMISC) ||
3095 sdata->u.mgd.use_4addr)
Johannes Berg3c2723f52014-01-07 16:23:24 +01003096 return false;
Johannes Berg554891e2010-09-24 12:38:25 +02003097 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02003098 }
3099 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02003100 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02003101 if (!bssid)
Johannes Berg3c2723f52014-01-07 16:23:24 +01003102 return false;
Felix Fietkau6329b8d2013-09-17 11:15:43 +02003103 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3104 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003105 return false;
Harvey Harrisona7767f92008-07-02 16:30:51 -07003106 if (ieee80211_is_beacon(hdr->frame_control)) {
Johannes Berg3c2723f52014-01-07 16:23:24 +01003107 return true;
Johannes Bergd48b2962012-07-06 22:19:27 +02003108 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
Johannes Berg3c2723f52014-01-07 16:23:24 +01003109 return false;
Johannes Berg23a24de2007-07-27 15:43:22 +02003110 } else if (!multicast &&
Joe Perchesb203ca32012-05-08 18:56:52 +00003111 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
Johannes Berg4150c572007-09-17 01:29:23 -04003112 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003113 return false;
Johannes Berg554891e2010-09-24 12:38:25 +02003114 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003115 } else if (!rx->sta) {
3116 int rate_idx;
Johannes Berg56146182012-11-09 15:07:02 +01003117 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3118 rate_idx = 0; /* TODO: HT/VHT rates */
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003119 else
Johannes Bergeb9fb5b82009-11-16 13:58:20 +01003120 rate_idx = status->rate_idx;
Johannes Berg8bf11d82011-12-15 11:17:37 +01003121 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3122 BIT(rate_idx));
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003123 }
Johannes Berg23a24de2007-07-27 15:43:22 +02003124 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02003125 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg6032f932008-02-23 15:17:07 +01003126 if (!multicast &&
Joe Perchesb203ca32012-05-08 18:56:52 +00003127 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
Johannes Berg6032f932008-02-23 15:17:07 +01003128 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003129 return false;
Johannes Berg6032f932008-02-23 15:17:07 +01003130
Johannes Berg554891e2010-09-24 12:38:25 +02003131 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg6032f932008-02-23 15:17:07 +01003132 }
3133 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02003134 case NL80211_IFTYPE_AP_VLAN:
3135 case NL80211_IFTYPE_AP:
Johannes Berg23a24de2007-07-27 15:43:22 +02003136 if (!bssid) {
Joe Perchesb203ca32012-05-08 18:56:52 +00003137 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003138 return false;
Johannes Bergf142c6b2012-06-18 20:07:15 +02003139 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
Johannes Berg3df6eae2011-12-06 10:39:40 +01003140 /*
3141 * Accept public action frames even when the
3142 * BSSID doesn't match, this is used for P2P
3143 * and location updates. Note that mac80211
3144 * itself never looks at these frames.
3145 */
Johannes Berg2b9ccd42013-05-13 16:42:40 +02003146 if (!multicast &&
3147 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003148 return false;
Johannes Bergd48b2962012-07-06 22:19:27 +02003149 if (ieee80211_is_public_action(hdr, skb->len))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003150 return true;
Johannes Bergd48b2962012-07-06 22:19:27 +02003151 if (!ieee80211_is_beacon(hdr->frame_control))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003152 return false;
Johannes Berg554891e2010-09-24 12:38:25 +02003153 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02003154 }
Johannes Berg23a24de2007-07-27 15:43:22 +02003155 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02003156 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07003157 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003158 return false;
Joe Perchesb203ca32012-05-08 18:56:52 +00003159 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003160 return false;
Johannes Berg23a24de2007-07-27 15:43:22 +02003161 break;
Johannes Bergf142c6b2012-06-18 20:07:15 +02003162 case NL80211_IFTYPE_P2P_DEVICE:
3163 if (!ieee80211_is_public_action(hdr, skb->len) &&
3164 !ieee80211_is_probe_req(hdr->frame_control) &&
3165 !ieee80211_is_probe_resp(hdr->frame_control) &&
3166 !ieee80211_is_beacon(hdr->frame_control))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003167 return false;
Johannes Berg1b737f82013-04-18 23:42:19 +02003168 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3169 !multicast)
Johannes Bergf142c6b2012-06-18 20:07:15 +02003170 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3171 break;
Johannes Berg2ca27bc2010-09-16 14:58:23 +02003172 default:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02003173 /* should never get here */
Johannes Bergf142c6b2012-06-18 20:07:15 +02003174 WARN_ON_ONCE(1);
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02003175 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02003176 }
3177
Johannes Berg3c2723f52014-01-07 16:23:24 +01003178 return true;
Johannes Berg23a24de2007-07-27 15:43:22 +02003179}
3180
Johannes Berg571ecf62007-07-27 15:43:22 +02003181/*
Johannes Berg4406c372010-09-24 11:21:06 +02003182 * This function returns whether or not the SKB
3183 * was destined for RX processing or not, which,
3184 * if consume is true, is equivalent to whether
3185 * or not the skb was consumed.
3186 */
3187static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3188 struct sk_buff *skb, bool consume)
3189{
3190 struct ieee80211_local *local = rx->local;
3191 struct ieee80211_sub_if_data *sdata = rx->sdata;
3192 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3193 struct ieee80211_hdr *hdr = (void *)skb->data;
Johannes Berg4406c372010-09-24 11:21:06 +02003194
3195 rx->skb = skb;
Johannes Berg554891e2010-09-24 12:38:25 +02003196 status->rx_flags |= IEEE80211_RX_RA_MATCH;
Johannes Berg4406c372010-09-24 11:21:06 +02003197
Emmanuel Grumbach40791942014-01-07 13:10:20 +02003198 if (!prepare_for_handlers(rx, hdr))
Johannes Berg4406c372010-09-24 11:21:06 +02003199 return false;
3200
Johannes Berg4406c372010-09-24 11:21:06 +02003201 if (!consume) {
3202 skb = skb_copy(skb, GFP_ATOMIC);
3203 if (!skb) {
3204 if (net_ratelimit())
3205 wiphy_debug(local->hw.wiphy,
Ben Greearb305dae2011-01-08 10:30:54 -08003206 "failed to copy skb for %s\n",
Johannes Berg4406c372010-09-24 11:21:06 +02003207 sdata->name);
3208 return true;
3209 }
3210
3211 rx->skb = skb;
3212 }
3213
3214 ieee80211_invoke_rx_handlers(rx);
3215 return true;
3216}
3217
3218/*
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003219 * This is the actual Rx frames handler. as it blongs to Rx path it must
3220 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02003221 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02003222static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
Christian Lamparter071d9ac2010-08-05 01:36:36 +02003223 struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02003224{
3225 struct ieee80211_local *local = hw_to_local(hw);
3226 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02003227 struct ieee80211_hdr *hdr;
Zhu Yie3cf8b32010-03-29 17:35:07 +08003228 __le16 fc;
Johannes Berg5cf121c2008-02-25 16:27:43 +01003229 struct ieee80211_rx_data rx;
Johannes Berg4406c372010-09-24 11:21:06 +02003230 struct ieee80211_sub_if_data *prev;
Ben Greear56af3262010-09-23 10:22:24 -07003231 struct sta_info *sta, *tmp, *prev_sta;
Zhu Yie3cf8b32010-03-29 17:35:07 +08003232 int err = 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02003233
Zhu Yie3cf8b32010-03-29 17:35:07 +08003234 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02003235 memset(&rx, 0, sizeof(rx));
3236 rx.skb = skb;
3237 rx.local = local;
Johannes Berg72abd812007-09-17 01:29:22 -04003238
Zhu Yie3cf8b32010-03-29 17:35:07 +08003239 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
Johannes Berg571ecf62007-07-27 15:43:22 +02003240 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02003241
Johannes Berg4a4f1a52012-10-26 00:33:36 +02003242 if (ieee80211_is_mgmt(fc)) {
3243 /* drop frame if too short for header */
3244 if (skb->len < ieee80211_hdrlen(fc))
3245 err = -ENOBUFS;
3246 else
3247 err = skb_linearize(skb);
3248 } else {
Zhu Yie3cf8b32010-03-29 17:35:07 +08003249 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
Johannes Berg4a4f1a52012-10-26 00:33:36 +02003250 }
Zhu Yie3cf8b32010-03-29 17:35:07 +08003251
3252 if (err) {
3253 dev_kfree_skb(skb);
3254 return;
3255 }
3256
3257 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg38f37142008-01-29 17:07:43 +01003258 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01003259 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01003260
Johannes Bergd48b2962012-07-06 22:19:27 +02003261 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3262 ieee80211_is_beacon(hdr->frame_control)))
3263 ieee80211_scan_rx(local, skb);
3264
Zhu Yie3cf8b32010-03-29 17:35:07 +08003265 if (ieee80211_is_data(fc)) {
Ben Greear56af3262010-09-23 10:22:24 -07003266 prev_sta = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02003267
Johannes Berg7852e362012-01-20 13:55:24 +01003268 for_each_sta_info(local, hdr->addr2, sta, tmp) {
Ben Greear56af3262010-09-23 10:22:24 -07003269 if (!prev_sta) {
3270 prev_sta = sta;
3271 continue;
3272 }
3273
3274 rx.sta = prev_sta;
3275 rx.sdata = prev_sta->sdata;
Johannes Berg4406c372010-09-24 11:21:06 +02003276 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Johannes Berg571ecf62007-07-27 15:43:22 +02003277
Ben Greear56af3262010-09-23 10:22:24 -07003278 prev_sta = sta;
Johannes Berg4406c372010-09-24 11:21:06 +02003279 }
Ben Greear56af3262010-09-23 10:22:24 -07003280
3281 if (prev_sta) {
3282 rx.sta = prev_sta;
3283 rx.sdata = prev_sta->sdata;
3284
Johannes Berg4406c372010-09-24 11:21:06 +02003285 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
Ben Greear56af3262010-09-23 10:22:24 -07003286 return;
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05303287 goto out;
Ben Greear56af3262010-09-23 10:22:24 -07003288 }
Johannes Berg4406c372010-09-24 11:21:06 +02003289 }
3290
Johannes Berg4b0dd982010-09-24 11:21:07 +02003291 prev = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02003292
Johannes Berg4b0dd982010-09-24 11:21:07 +02003293 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3294 if (!ieee80211_sdata_running(sdata))
3295 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01003296
Johannes Berg4b0dd982010-09-24 11:21:07 +02003297 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3298 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3299 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01003300
Johannes Berg4b0dd982010-09-24 11:21:07 +02003301 /*
3302 * frame is destined for this interface, but if it's
3303 * not also for the previous one we handle that after
3304 * the loop to avoid copying the SKB once too much
3305 */
Johannes Bergb2e77712007-09-26 15:19:39 +02003306
Johannes Berg4b0dd982010-09-24 11:21:07 +02003307 if (!prev) {
Johannes Berg340e11f2007-07-27 15:43:22 +02003308 prev = sdata;
Johannes Berg4b0dd982010-09-24 11:21:07 +02003309 continue;
Johannes Berg8e6f00322007-07-27 15:43:22 +02003310 }
Felix Fietkau4bb29f82010-01-22 00:36:39 +01003311
Johannes Berg7852e362012-01-20 13:55:24 +01003312 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Johannes Berg4b0dd982010-09-24 11:21:07 +02003313 rx.sdata = prev;
3314 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01003315
Johannes Berg4b0dd982010-09-24 11:21:07 +02003316 prev = sdata;
3317 }
Johannes Berg4406c372010-09-24 11:21:06 +02003318
Johannes Berg4b0dd982010-09-24 11:21:07 +02003319 if (prev) {
Johannes Berg7852e362012-01-20 13:55:24 +01003320 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Johannes Berg4b0dd982010-09-24 11:21:07 +02003321 rx.sdata = prev;
3322
3323 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3324 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02003325 }
Johannes Berg4406c372010-09-24 11:21:06 +02003326
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05303327 out:
Johannes Berg4406c372010-09-24 11:21:06 +02003328 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02003329}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003330
3331/*
3332 * This is the receive path handler. It is called by a low level driver when an
3333 * 802.11 MPDU is received from the hardware.
3334 */
John W. Linville103bf9f2009-08-20 16:34:15 -04003335void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003336{
3337 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01003338 struct ieee80211_rate *rate = NULL;
3339 struct ieee80211_supported_band *sband;
Johannes Bergf1d58c22009-06-17 13:13:00 +02003340 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg8318d782008-01-24 19:38:38 +01003341
Johannes Bergd20ef632009-10-11 15:10:40 +02003342 WARN_ON_ONCE(softirq_count() == 0);
3343
Johannes Berg444e3802012-09-30 17:08:35 +02003344 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
Johannes Berg77a980d2009-08-24 11:46:30 +02003345 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01003346
3347 sband = local->hw.wiphy->bands[status->band];
Johannes Berg77a980d2009-08-24 11:46:30 +02003348 if (WARN_ON(!sband))
3349 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01003350
Johannes Berg89c3a8a2009-07-28 18:10:17 +02003351 /*
3352 * If we're suspending, it is possible although not too likely
3353 * that we'd be receiving frames after having already partially
3354 * quiesced the stack. We can't process such frames then since
3355 * that might, for example, cause stations to be added or other
3356 * driver callbacks be invoked.
3357 */
Johannes Berg77a980d2009-08-24 11:46:30 +02003358 if (unlikely(local->quiescing || local->suspended))
3359 goto drop;
Johannes Berg89c3a8a2009-07-28 18:10:17 +02003360
Arik Nemtsov04800ad2012-06-06 11:25:02 +03003361 /* We might be during a HW reconfig, prevent Rx for the same reason */
3362 if (unlikely(local->in_reconfig))
3363 goto drop;
3364
Johannes Bergea77f122009-08-21 14:44:45 +02003365 /*
3366 * The same happens when we're not even started,
3367 * but that's worth a warning.
3368 */
Johannes Berg77a980d2009-08-24 11:46:30 +02003369 if (WARN_ON(!local->started))
3370 goto drop;
Johannes Bergea77f122009-08-21 14:44:45 +02003371
Johannes Bergfc885182010-07-30 13:23:12 +02003372 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05003373 /*
Johannes Bergfc885182010-07-30 13:23:12 +02003374 * Validate the rate, unless a PLCP error means that
3375 * we probably can't have a valid rate here anyway.
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05003376 */
Johannes Bergfc885182010-07-30 13:23:12 +02003377
3378 if (status->flag & RX_FLAG_HT) {
3379 /*
3380 * rate_idx is MCS index, which can be [0-76]
3381 * as documented on:
3382 *
3383 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3384 *
3385 * Anything else would be some sort of driver or
3386 * hardware error. The driver should catch hardware
3387 * errors.
3388 */
Johannes Berg444e3802012-09-30 17:08:35 +02003389 if (WARN(status->rate_idx > 76,
Johannes Bergfc885182010-07-30 13:23:12 +02003390 "Rate marked as an HT rate but passed "
3391 "status->rate_idx is not "
3392 "an MCS index [0-76]: %d (0x%02x)\n",
3393 status->rate_idx,
3394 status->rate_idx))
3395 goto drop;
Johannes Berg56146182012-11-09 15:07:02 +01003396 } else if (status->flag & RX_FLAG_VHT) {
3397 if (WARN_ONCE(status->rate_idx > 9 ||
3398 !status->vht_nss ||
3399 status->vht_nss > 8,
3400 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3401 status->rate_idx, status->vht_nss))
3402 goto drop;
Johannes Bergfc885182010-07-30 13:23:12 +02003403 } else {
Johannes Berg444e3802012-09-30 17:08:35 +02003404 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
Johannes Bergfc885182010-07-30 13:23:12 +02003405 goto drop;
3406 rate = &sband->bitrates[status->rate_idx];
3407 }
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003408 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003409
Johannes Berg554891e2010-09-24 12:38:25 +02003410 status->rx_flags = 0;
3411
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003412 /*
3413 * key references and virtual interfaces are protected using RCU
3414 * and this requires that we are in a read-side RCU section during
3415 * receive processing
3416 */
3417 rcu_read_lock();
3418
3419 /*
3420 * Frames with failed FCS/PLCP checksum are not returned,
3421 * all other frames are returned without radiotap header
3422 * if it was previously present.
3423 * Also, frames with less than 16 bytes are dropped.
3424 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02003425 skb = ieee80211_rx_monitor(local, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003426 if (!skb) {
3427 rcu_read_unlock();
3428 return;
3429 }
3430
Johannes Berge1e54062010-11-30 08:58:45 +01003431 ieee80211_tpt_led_trig_rx(local,
3432 ((struct ieee80211_hdr *)skb->data)->frame_control,
3433 skb->len);
Christian Lamparter071d9ac2010-08-05 01:36:36 +02003434 __ieee80211_rx_handle_packet(hw, skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003435
3436 rcu_read_unlock();
Johannes Berg77a980d2009-08-24 11:46:30 +02003437
3438 return;
3439 drop:
3440 kfree_skb(skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003441}
John W. Linville103bf9f2009-08-20 16:34:15 -04003442EXPORT_SYMBOL(ieee80211_rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02003443
3444/* This is a version of the rx handler that can be called from hard irq
3445 * context. Post the skb on the queue and schedule the tasklet */
Johannes Bergf1d58c22009-06-17 13:13:00 +02003446void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02003447{
3448 struct ieee80211_local *local = hw_to_local(hw);
3449
3450 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3451
Johannes Berg571ecf62007-07-27 15:43:22 +02003452 skb->pkt_type = IEEE80211_RX_MSG;
3453 skb_queue_tail(&local->skb_queue, skb);
3454 tasklet_schedule(&local->tasklet);
3455}
3456EXPORT_SYMBOL(ieee80211_rx_irqsafe);