blob: 6b85f95b9ba16ed010d6f8a87b2829dae3dd7ca9 [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
Johannes Berg1df332e2012-10-26 00:09:11 +0200641static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100642{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700643 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg47846c92009-11-25 17:46:19 +0100644 char *dev_addr = rx->sdata->vif.addr;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100645
Harvey Harrisona7767f92008-07-02 16:30:51 -0700646 if (ieee80211_is_data(hdr->frame_control)) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700647 if (is_multicast_ether_addr(hdr->addr1)) {
648 if (ieee80211_has_tods(hdr->frame_control) ||
Johannes Berg1df332e2012-10-26 00:09:11 +0200649 !ieee80211_has_fromds(hdr->frame_control))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700650 return RX_DROP_MONITOR;
Joe Perchesb203ca32012-05-08 18:56:52 +0000651 if (ether_addr_equal(hdr->addr3, dev_addr))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700652 return RX_DROP_MONITOR;
653 } else {
654 if (!ieee80211_has_a4(hdr->frame_control))
655 return RX_DROP_MONITOR;
Joe Perchesb203ca32012-05-08 18:56:52 +0000656 if (ether_addr_equal(hdr->addr4, dev_addr))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700657 return RX_DROP_MONITOR;
658 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100659 }
660
661 /* If there is not an established peer link and this is not a peer link
662 * establisment frame, beacon or probe, drop the frame.
663 */
664
Javier Cardona57cf8042011-05-13 10:45:43 -0700665 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100666 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100667
Harvey Harrisona7767f92008-07-02 16:30:51 -0700668 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100669 return RX_DROP_MONITOR;
670
Harvey Harrisona7767f92008-07-02 16:30:51 -0700671 if (ieee80211_is_action(hdr->frame_control)) {
Javier Cardonad3aaec8a2011-05-03 16:57:09 -0700672 u8 category;
Johannes Berg9b395bc2012-10-26 00:36:40 +0200673
674 /* make sure category field is present */
675 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
676 return RX_DROP_MONITOR;
677
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100678 mgmt = (struct ieee80211_mgmt *)hdr;
Javier Cardonad3aaec8a2011-05-03 16:57:09 -0700679 category = mgmt->u.action.category;
680 if (category != WLAN_CATEGORY_MESH_ACTION &&
Johannes Berg1df332e2012-10-26 00:09:11 +0200681 category != WLAN_CATEGORY_SELF_PROTECTED)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100682 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100683 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100684 }
685
Harvey Harrisona7767f92008-07-02 16:30:51 -0700686 if (ieee80211_is_probe_req(hdr->frame_control) ||
687 ieee80211_is_probe_resp(hdr->frame_control) ||
Javier Cardona71839122011-04-07 15:08:31 -0700688 ieee80211_is_beacon(hdr->frame_control) ||
689 ieee80211_is_auth(hdr->frame_control))
Harvey Harrisona7767f92008-07-02 16:30:51 -0700690 return RX_CONTINUE;
691
692 return RX_DROP_MONITOR;
Harvey Harrisona7767f92008-07-02 16:30:51 -0700693 }
694
Johannes Berg902acc72008-02-23 15:17:19 +0100695 return RX_CONTINUE;
696}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100697
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200698static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100699 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000700 int index,
701 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100702{
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100703 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
Christian Lamparter4cfda472010-12-27 23:21:26 +0100704 struct ieee80211_rx_status *status;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100705
Johannes Bergdd318572010-11-29 11:09:16 +0100706 lockdep_assert_held(&tid_agg_rx->reorder_lock);
707
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100708 if (!skb)
709 goto no_frame;
710
Christian Lamparter071d9ac2010-08-05 01:36:36 +0200711 /* release the frame from the reorder ring buffer */
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100712 tid_agg_rx->stored_mpdu_num--;
713 tid_agg_rx->reorder_buf[index] = NULL;
Christian Lamparter4cfda472010-12-27 23:21:26 +0100714 status = IEEE80211_SKB_RXCB(skb);
715 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000716 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100717
718no_frame:
Johannes Berg9a886582013-02-15 19:25:00 +0100719 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100720}
721
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200722static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100723 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000724 u16 head_seq_num,
725 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100726{
727 int index;
728
Johannes Bergdd318572010-11-29 11:09:16 +0100729 lockdep_assert_held(&tid_agg_rx->reorder_lock);
730
Johannes Berg9a886582013-02-15 19:25:00 +0100731 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
732 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
733 tid_agg_rx->ssn) %
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100734 tid_agg_rx->buf_size;
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000735 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
736 frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100737 }
738}
739
740/*
741 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
742 * the skb was added to the buffer longer than this time ago, the earlier
743 * frames that have not yet been received are assumed to be lost and the skb
744 * can be released for processing. This may also release other skb's from the
745 * reorder buffer if there are no additional gaps between the frames.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200746 *
747 * Callers must hold tid_agg_rx->reorder_lock.
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100748 */
749#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
750
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200751static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000752 struct tid_ampdu_rx *tid_agg_rx,
753 struct sk_buff_head *frames)
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200754{
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200755 int index, j;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200756
Johannes Bergdd318572010-11-29 11:09:16 +0100757 lockdep_assert_held(&tid_agg_rx->reorder_lock);
758
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200759 /* release the buffer until next missing frame */
Johannes Berg9a886582013-02-15 19:25:00 +0100760 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
761 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200762 if (!tid_agg_rx->reorder_buf[index] &&
Eliad Peller07ae2df2012-02-01 18:48:09 +0200763 tid_agg_rx->stored_mpdu_num) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200764 /*
765 * No buffers ready to be released, but check whether any
766 * frames in the reorder buffer have timed out.
767 */
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200768 int skipped = 1;
769 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
770 j = (j + 1) % tid_agg_rx->buf_size) {
771 if (!tid_agg_rx->reorder_buf[j]) {
772 skipped++;
773 continue;
774 }
Daniel Halperin499fe9a2011-03-24 16:01:48 -0700775 if (skipped &&
776 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200777 HT_RX_REORDER_BUF_TIMEOUT))
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200778 goto set_release_timer;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200779
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200780 ht_dbg_ratelimited(sdata,
781 "release an RX reorder frame due to timeout on earlier frames\n");
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000782 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
783 frames);
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200784
785 /*
786 * Increment the head seq# also for the skipped slots.
787 */
788 tid_agg_rx->head_seq_num =
Johannes Berg9a886582013-02-15 19:25:00 +0100789 (tid_agg_rx->head_seq_num +
790 skipped) & IEEE80211_SN_MASK;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200791 skipped = 0;
792 }
793 } else while (tid_agg_rx->reorder_buf[index]) {
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000794 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
795 frames);
Johannes Berg9a886582013-02-15 19:25:00 +0100796 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
797 tid_agg_rx->ssn) %
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200798 tid_agg_rx->buf_size;
799 }
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200800
801 if (tid_agg_rx->stored_mpdu_num) {
Johannes Berg9a886582013-02-15 19:25:00 +0100802 j = index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
803 tid_agg_rx->ssn) %
804 tid_agg_rx->buf_size;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200805
806 for (; j != (index - 1) % tid_agg_rx->buf_size;
807 j = (j + 1) % tid_agg_rx->buf_size) {
808 if (tid_agg_rx->reorder_buf[j])
809 break;
810 }
811
812 set_release_timer:
813
814 mod_timer(&tid_agg_rx->reorder_timer,
Christian Lamparter334df732011-04-24 20:41:16 +0200815 tid_agg_rx->reorder_time[j] + 1 +
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200816 HT_RX_REORDER_BUF_TIMEOUT);
817 } else {
818 del_timer(&tid_agg_rx->reorder_timer);
819 }
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200820}
821
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100822/*
823 * As this function belongs to the RX path it must be under
824 * rcu_read_lock protection. It returns false if the frame
825 * can be processed immediately, true if it was consumed.
826 */
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200827static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100828 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000829 struct sk_buff *skb,
830 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100831{
832 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
833 u16 sc = le16_to_cpu(hdr->seq_ctrl);
834 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
835 u16 head_seq_num, buf_size;
836 int index;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200837 bool ret = true;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100838
Johannes Bergdd318572010-11-29 11:09:16 +0100839 spin_lock(&tid_agg_rx->reorder_lock);
840
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100841 buf_size = tid_agg_rx->buf_size;
842 head_seq_num = tid_agg_rx->head_seq_num;
843
844 /* frame with out of date sequence number */
Johannes Berg9a886582013-02-15 19:25:00 +0100845 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100846 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200847 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100848 }
849
850 /*
851 * If frame the sequence number exceeds our buffering window
852 * size release some previous frames to make room for this one.
853 */
Johannes Berg9a886582013-02-15 19:25:00 +0100854 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
855 head_seq_num = ieee80211_sn_inc(
856 ieee80211_sn_sub(mpdu_seq_num, buf_size));
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100857 /* release stored frames up to new head to stack */
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200858 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000859 head_seq_num, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100860 }
861
862 /* Now the new frame is always in the range of the reordering buffer */
863
Johannes Berg9a886582013-02-15 19:25:00 +0100864 index = ieee80211_sn_sub(mpdu_seq_num,
865 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100866
867 /* check if we already stored this frame */
868 if (tid_agg_rx->reorder_buf[index]) {
869 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200870 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100871 }
872
873 /*
874 * If the current MPDU is in the right order and nothing else
875 * is stored we can process it directly, no need to buffer it.
Johannes Bergc835b212011-03-15 23:17:01 +0100876 * If it is first but there's something stored, we may be able
877 * to release frames after this one.
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100878 */
879 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
880 tid_agg_rx->stored_mpdu_num == 0) {
Johannes Berg9a886582013-02-15 19:25:00 +0100881 tid_agg_rx->head_seq_num =
882 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200883 ret = false;
884 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100885 }
886
887 /* put the frame in the reordering buffer */
888 tid_agg_rx->reorder_buf[index] = skb;
889 tid_agg_rx->reorder_time[index] = jiffies;
890 tid_agg_rx->stored_mpdu_num++;
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000891 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100892
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200893 out:
894 spin_unlock(&tid_agg_rx->reorder_lock);
895 return ret;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100896}
897
898/*
899 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
900 * true if the MPDU was buffered, false if it should be processed.
901 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000902static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
903 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100904{
Johannes Berg2569a822009-11-25 17:46:17 +0100905 struct sk_buff *skb = rx->skb;
906 struct ieee80211_local *local = rx->local;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100907 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Thomas Pedersen660c6a42011-11-03 21:11:12 -0700908 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg2569a822009-11-25 17:46:17 +0100909 struct sta_info *sta = rx->sta;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100910 struct tid_ampdu_rx *tid_agg_rx;
911 u16 sc;
Thomas Pedersen6cc00d52011-11-03 21:11:11 -0700912 u8 tid, ack_policy;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100913
914 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg2569a822009-11-25 17:46:17 +0100915 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100916
917 /*
918 * filter the QoS data rx stream according to
919 * STA/TID and check if this STA/TID is on aggregation
920 */
921
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100922 if (!sta)
Johannes Berg2569a822009-11-25 17:46:17 +0100923 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100924
Thomas Pedersen6cc00d52011-11-03 21:11:11 -0700925 ack_policy = *ieee80211_get_qos_ctl(hdr) &
926 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100927 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
928
Johannes Berga87f7362010-06-10 10:21:38 +0200929 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
930 if (!tid_agg_rx)
931 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100932
933 /* qos null data frames are excluded */
934 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Johannes Berga87f7362010-06-10 10:21:38 +0200935 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100936
Thomas Pedersen6cc00d52011-11-03 21:11:11 -0700937 /* not part of a BA session */
938 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
939 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
940 goto dont_reorder;
941
Thomas Pedersen660c6a42011-11-03 21:11:12 -0700942 /* not actually part of this BA session */
943 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
944 goto dont_reorder;
945
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100946 /* new, potentially un-ordered, ampdu frame - process it */
947
948 /* reset session timer */
949 if (tid_agg_rx->timeout)
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100950 tid_agg_rx->last_rx = jiffies;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100951
952 /* if this mpdu is fragmented - terminate rx aggregation session */
953 sc = le16_to_cpu(hdr->seq_ctrl);
954 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Bergc1475ca2010-06-10 10:21:37 +0200955 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg344eec62010-06-10 10:21:36 +0200956 skb_queue_tail(&rx->sdata->skb_queue, skb);
957 ieee80211_queue_work(&local->hw, &rx->sdata->work);
Johannes Berg2569a822009-11-25 17:46:17 +0100958 return;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100959 }
960
Johannes Berga87f7362010-06-10 10:21:38 +0200961 /*
962 * No locking needed -- we will only ever process one
963 * RX packet at a time, and thus own tid_agg_rx. All
964 * other code manipulating it needs to (and does) make
965 * sure that we cannot get to it any more before doing
966 * anything with it.
967 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000968 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
969 frames))
Johannes Berg2569a822009-11-25 17:46:17 +0100970 return;
971
972 dont_reorder:
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000973 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100974}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100975
Johannes Berg49461622008-06-30 15:10:45 +0200976static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100977ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200978{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700979 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +0200980 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200981
Johannes Berg6b0f3272013-07-11 22:33:26 +0200982 /*
983 * Drop duplicate 802.11 retransmissions
984 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
985 */
986 if (rx->skb->len >= 24 && rx->sta &&
987 !ieee80211_is_ctl(hdr->frame_control) &&
988 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
989 !is_multicast_ether_addr(hdr->addr1)) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700990 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
Johannes Berg9e262972011-07-07 18:45:03 +0200991 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
Johannes Berg571ecf62007-07-27 15:43:22 +0200992 hdr->seq_ctrl)) {
Johannes Berg554891e2010-09-24 12:38:25 +0200993 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200994 rx->local->dot11FrameDuplicateCount++;
995 rx->sta->num_duplicates++;
996 }
Felix Fietkaub1f93312011-02-04 19:20:08 +0100997 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200998 } else
Johannes Berg9e262972011-07-07 18:45:03 +0200999 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +02001000 }
1001
Johannes Berg571ecf62007-07-27 15:43:22 +02001002 if (unlikely(rx->skb->len < 16)) {
1003 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001004 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001005 }
1006
Johannes Berg571ecf62007-07-27 15:43:22 +02001007 /* Drop disallowed frame classes based on STA auth/assoc state;
1008 * IEEE 802.11, Chap 5.5.
1009 *
Johannes Bergccd7b362008-09-11 00:01:56 +02001010 * mac80211 filters only based on association state, i.e. it drops
1011 * Class 3 frames from not associated stations. hostapd sends
Johannes Berg571ecf62007-07-27 15:43:22 +02001012 * deauth/disassoc frames when needed. In addition, hostapd is
1013 * responsible for filtering on both auth and assoc states.
1014 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001015
Johannes Berg902acc72008-02-23 15:17:19 +01001016 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001017 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001018
Harvey Harrisona7767f92008-07-02 16:30:51 -07001019 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1020 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001021 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Bill Jordan1be7fe82010-10-01 11:20:41 -04001022 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001023 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
Johannes Berg7852e362012-01-20 13:55:24 +01001024 /*
1025 * accept port control frames from the AP even when it's not
1026 * yet marked ASSOC to prevent a race where we don't set the
1027 * assoc bit quickly enough before it sends the first frame
1028 */
1029 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
Guy Eilam2a33bee2011-08-17 15:18:15 +03001030 ieee80211_is_data_present(hdr->frame_control)) {
Johannes Berg6dbda2d2012-10-26 00:41:23 +02001031 unsigned int hdrlen;
1032 __be16 ethertype;
Guy Eilam2a33bee2011-08-17 15:18:15 +03001033
Johannes Berg6dbda2d2012-10-26 00:41:23 +02001034 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1035
1036 if (rx->skb->len < hdrlen + 8)
1037 return RX_DROP_MONITOR;
1038
1039 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1040 if (ethertype == rx->sdata->control_port_protocol)
Guy Eilam2a33bee2011-08-17 15:18:15 +03001041 return RX_CONTINUE;
1042 }
Johannes Berg21fc7562011-11-04 11:18:13 +01001043
1044 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1045 cfg80211_rx_spurious_frame(rx->sdata->dev,
1046 hdr->addr2,
1047 GFP_ATOMIC))
1048 return RX_DROP_UNUSABLE;
1049
Johannes Berge4c26ad2008-01-31 19:48:21 +01001050 return RX_DROP_MONITOR;
Guy Eilam2a33bee2011-08-17 15:18:15 +03001051 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001052
Johannes Berg9ae54c82008-01-31 19:48:20 +01001053 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +02001054}
1055
1056
Johannes Berg49461622008-06-30 15:10:45 +02001057static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001058ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
Johannes Berg570bd532007-07-27 15:43:22 +02001059{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001060 struct sk_buff *skb = rx->skb;
1061 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1062 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg3017b802007-08-28 17:01:53 -04001063 int keyidx;
1064 int hdrlen;
Johannes Berge4c26ad2008-01-31 19:48:21 +01001065 ieee80211_rx_result result = RX_DROP_UNUSABLE;
Johannes Berge31b8212010-10-05 19:39:30 +02001066 struct ieee80211_key *sta_ptk = NULL;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001067 int mmie_keyidx = -1;
Johannes Berg761ab472010-05-28 14:24:19 +02001068 __le16 fc;
Johannes Berg570bd532007-07-27 15:43:22 +02001069
Johannes Berg3017b802007-08-28 17:01:53 -04001070 /*
1071 * Key selection 101
1072 *
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001073 * There are four types of keys:
Johannes Berg3017b802007-08-28 17:01:53 -04001074 * - GTK (group keys)
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001075 * - IGTK (group keys for management frames)
Johannes Berg3017b802007-08-28 17:01:53 -04001076 * - PTK (pairwise keys)
1077 * - STK (station-to-station pairwise keys)
1078 *
1079 * When selecting a key, we have to distinguish between multicast
1080 * (including broadcast) and unicast frames, the latter can only
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001081 * use PTKs and STKs while the former always use GTKs and IGTKs.
1082 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1083 * unicast frames can also use key indices like GTKs. Hence, if we
1084 * don't have a PTK/STK we check the key index for a WEP key.
Johannes Berg3017b802007-08-28 17:01:53 -04001085 *
Johannes Berg8dc06a12007-08-28 17:01:55 -04001086 * Note that in a regular BSS, multicast frames are sent by the
1087 * AP only, associated stations unicast the frame to the AP first
1088 * which then multicasts it on their behalf.
1089 *
Johannes Berg3017b802007-08-28 17:01:53 -04001090 * There is also a slight problem in IBSS mode: GTKs are negotiated
1091 * with each station, that is something we don't currently handle.
Johannes Berg8dc06a12007-08-28 17:01:55 -04001092 * The spec seems to expect that one negotiates the same key with
1093 * every station but there's no such requirement; VLANs could be
1094 * possible.
Johannes Berg3017b802007-08-28 17:01:53 -04001095 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001096
Johannes Berg3017b802007-08-28 17:01:53 -04001097 /*
Johannes Berg1990af82007-09-26 17:53:15 +02001098 * No point in finding a key and decrypting if the frame is neither
Johannes Berg3017b802007-08-28 17:01:53 -04001099 * addressed to us nor a multicast frame.
1100 */
Johannes Berg554891e2010-09-24 12:38:25 +02001101 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001102 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -04001103
Johannes Berg2569a822009-11-25 17:46:17 +01001104 /* start without a key */
1105 rx->key = NULL;
1106
Johannes Bergd4e46a32007-09-14 11:10:24 -04001107 if (rx->sta)
Johannes Berge31b8212010-10-05 19:39:30 +02001108 sta_ptk = rcu_dereference(rx->sta->ptk);
Johannes Bergd4e46a32007-09-14 11:10:24 -04001109
Johannes Berg761ab472010-05-28 14:24:19 +02001110 fc = hdr->frame_control;
1111
1112 if (!ieee80211_has_protected(fc))
Jouni Malinen0c7c10c2009-05-08 12:34:10 +03001113 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1114
Johannes Berge31b8212010-10-05 19:39:30 +02001115 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1116 rx->key = sta_ptk;
Johannes Bergdc1580d2010-08-10 09:46:40 +02001117 if ((status->flag & RX_FLAG_DECRYPTED) &&
1118 (status->flag & RX_FLAG_IV_STRIPPED))
1119 return RX_CONTINUE;
Jouni Malinen0c7c10c2009-05-08 12:34:10 +03001120 /* Skip decryption if the frame is not protected. */
Johannes Berg761ab472010-05-28 14:24:19 +02001121 if (!ieee80211_has_protected(fc))
Jouni Malinen0c7c10c2009-05-08 12:34:10 +03001122 return RX_CONTINUE;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001123 } else if (mmie_keyidx >= 0) {
1124 /* Broadcast/multicast robust management frame / BIP */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001125 if ((status->flag & RX_FLAG_DECRYPTED) &&
1126 (status->flag & RX_FLAG_IV_STRIPPED))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001127 return RX_CONTINUE;
1128
1129 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1130 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1131 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
Johannes Berge31b8212010-10-05 19:39:30 +02001132 if (rx->sta)
1133 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1134 if (!rx->key)
1135 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
Johannes Berg761ab472010-05-28 14:24:19 +02001136 } else if (!ieee80211_has_protected(fc)) {
Jouni Malinen0c7c10c2009-05-08 12:34:10 +03001137 /*
1138 * The frame was not protected, so skip decryption. However, we
1139 * need to set rx->key if there is a key that could have been
1140 * used so that the frame may be dropped if encryption would
1141 * have been expected.
1142 */
1143 struct ieee80211_key *key = NULL;
Johannes Berg897bed82010-12-09 19:49:00 +01001144 struct ieee80211_sub_if_data *sdata = rx->sdata;
1145 int i;
1146
Johannes Berg761ab472010-05-28 14:24:19 +02001147 if (ieee80211_is_mgmt(fc) &&
Jouni Malinen0c7c10c2009-05-08 12:34:10 +03001148 is_multicast_ether_addr(hdr->addr1) &&
1149 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1150 rx->key = key;
Johannes Berg897bed82010-12-09 19:49:00 +01001151 else {
1152 if (rx->sta) {
1153 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1154 key = rcu_dereference(rx->sta->gtk[i]);
1155 if (key)
1156 break;
1157 }
1158 }
1159 if (!key) {
1160 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1161 key = rcu_dereference(sdata->keys[i]);
1162 if (key)
1163 break;
1164 }
1165 }
1166 if (key)
1167 rx->key = key;
1168 }
Jouni Malinen0c7c10c2009-05-08 12:34:10 +03001169 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001170 } else {
Zhu Yi39184b12010-04-08 15:35:10 +08001171 u8 keyid;
Johannes Berg3017b802007-08-28 17:01:53 -04001172 /*
1173 * The device doesn't give us the IV so we won't be
1174 * able to look up the key. That's ok though, we
1175 * don't need to decrypt the frame, we just won't
1176 * be able to keep statistics accurate.
1177 * Except for key threshold notifications, should
1178 * we somehow allow the driver to tell us which key
1179 * the hardware used if this flag is set?
1180 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001181 if ((status->flag & RX_FLAG_DECRYPTED) &&
1182 (status->flag & RX_FLAG_IV_STRIPPED))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001183 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001184
Johannes Berg761ab472010-05-28 14:24:19 +02001185 hdrlen = ieee80211_hdrlen(fc);
Johannes Berg571ecf62007-07-27 15:43:22 +02001186
Johannes Berg3017b802007-08-28 17:01:53 -04001187 if (rx->skb->len < 8 + hdrlen)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001188 return RX_DROP_UNUSABLE; /* TODO: count this? */
Johannes Berg571ecf62007-07-27 15:43:22 +02001189
Johannes Berg3017b802007-08-28 17:01:53 -04001190 /*
1191 * no need to call ieee80211_wep_get_keyidx,
1192 * it verifies a bunch of things we've done already
1193 */
Zhu Yi39184b12010-04-08 15:35:10 +08001194 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1195 keyidx = keyid >> 6;
Johannes Berg3017b802007-08-28 17:01:53 -04001196
Johannes Berge31b8212010-10-05 19:39:30 +02001197 /* check per-station GTK first, if multicast packet */
1198 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1199 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
Johannes Berg3017b802007-08-28 17:01:53 -04001200
Johannes Berge31b8212010-10-05 19:39:30 +02001201 /* if not found, try default key */
1202 if (!rx->key) {
1203 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1204
1205 /*
1206 * RSNA-protected unicast frames should always be
1207 * sent with pairwise or station-to-station keys,
1208 * but for WEP we allow using a key index as well.
1209 */
1210 if (rx->key &&
1211 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1212 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1213 !is_multicast_ether_addr(hdr->addr1))
1214 rx->key = NULL;
1215 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001216 }
1217
Johannes Berg3017b802007-08-28 17:01:53 -04001218 if (rx->key) {
Johannes Berg95acac62011-07-12 12:30:59 +02001219 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1220 return RX_DROP_MONITOR;
1221
Johannes Berg571ecf62007-07-27 15:43:22 +02001222 rx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -04001223 /* TODO: add threshold stuff again */
Johannes Berg1990af82007-09-26 17:53:15 +02001224 } else {
Johannes Berge4c26ad2008-01-31 19:48:21 +01001225 return RX_DROP_MONITOR;
Johannes Berg70f08762007-09-26 17:53:14 +02001226 }
1227
Johannes Berg97359d12010-08-10 09:46:38 +02001228 switch (rx->key->conf.cipher) {
1229 case WLAN_CIPHER_SUITE_WEP40:
1230 case WLAN_CIPHER_SUITE_WEP104:
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001231 result = ieee80211_crypto_wep_decrypt(rx);
1232 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001233 case WLAN_CIPHER_SUITE_TKIP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001234 result = ieee80211_crypto_tkip_decrypt(rx);
1235 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001236 case WLAN_CIPHER_SUITE_CCMP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001237 result = ieee80211_crypto_ccmp_decrypt(rx);
1238 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001239 case WLAN_CIPHER_SUITE_AES_CMAC:
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001240 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1241 break;
Johannes Berg3ffc2a92010-08-27 14:26:52 +03001242 default:
1243 /*
1244 * We can reach here only with HW-only algorithms
1245 * but why didn't it decrypt the frame?!
1246 */
1247 return RX_DROP_UNUSABLE;
Johannes Berg70f08762007-09-26 17:53:14 +02001248 }
1249
Johannes Berga8286912012-03-12 13:49:14 +01001250 /* the hdr variable is invalid after the decrypt handlers */
1251
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001252 /* either the frame has been decrypted or will be dropped */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001253 status->flag |= RX_FLAG_DECRYPTED;
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001254
1255 return result;
Johannes Berg70f08762007-09-26 17:53:14 +02001256}
1257
Kalle Valo572e0012009-02-10 17:09:31 +02001258static ieee80211_rx_result debug_noinline
1259ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1260{
1261 struct ieee80211_local *local;
1262 struct ieee80211_hdr *hdr;
1263 struct sk_buff *skb;
1264
1265 local = rx->local;
1266 skb = rx->skb;
1267 hdr = (struct ieee80211_hdr *) skb->data;
1268
1269 if (!local->pspolling)
1270 return RX_CONTINUE;
1271
1272 if (!ieee80211_has_fromds(hdr->frame_control))
1273 /* this is not from AP */
1274 return RX_CONTINUE;
1275
1276 if (!ieee80211_is_data(hdr->frame_control))
1277 return RX_CONTINUE;
1278
1279 if (!ieee80211_has_moredata(hdr->frame_control)) {
1280 /* AP has no more frames buffered for us */
1281 local->pspolling = false;
1282 return RX_CONTINUE;
1283 }
1284
1285 /* more data bit is set, let's request a new frame from the AP */
1286 ieee80211_send_pspoll(local, rx->sdata);
1287
1288 return RX_CONTINUE;
1289}
1290
Marco Porschd012a602012-10-10 12:39:50 -07001291static void sta_ps_start(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001292{
Johannes Berg133b8222008-09-16 14:18:59 +02001293 struct ieee80211_sub_if_data *sdata = sta->sdata;
Christian Lamparter4571d3b2008-11-30 00:48:41 +01001294 struct ieee80211_local *local = sdata->local;
Marco Porschd012a602012-10-10 12:39:50 -07001295 struct ps_data *ps;
Joe Perches0795af52007-10-03 17:59:30 -07001296
Marco Porschd012a602012-10-10 12:39:50 -07001297 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1298 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1299 ps = &sdata->bss->ps;
1300 else
1301 return;
1302
1303 atomic_inc(&ps->num_sta_ps);
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001304 set_sta_flag(sta, WLAN_STA_PS_STA);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001305 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1306 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001307 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1308 sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001309}
1310
Marco Porschd012a602012-10-10 12:39:50 -07001311static void sta_ps_end(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001312{
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001313 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1314 sta->sta.addr, sta->sta.aid);
Johannes Berg004c8722008-02-20 11:21:35 +01001315
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001316 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001317 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1318 sta->sta.addr, sta->sta.aid);
Johannes Bergaf818582009-11-06 11:35:50 +01001319 return;
1320 }
1321
1322 ieee80211_sta_ps_deliver_wakeup(sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001323}
1324
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001325int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1326{
1327 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1328 bool in_ps;
1329
1330 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1331
1332 /* Don't let the same PS state be set twice */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001333 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001334 if ((start && in_ps) || (!start && !in_ps))
1335 return -EINVAL;
1336
1337 if (start)
Marco Porschd012a602012-10-10 12:39:50 -07001338 sta_ps_start(sta_inf);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001339 else
Marco Porschd012a602012-10-10 12:39:50 -07001340 sta_ps_end(sta_inf);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001341
1342 return 0;
1343}
1344EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1345
Johannes Berg49461622008-06-30 15:10:45 +02001346static ieee80211_rx_result debug_noinline
Johannes Berg47086fc2011-09-29 16:04:33 +02001347ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1348{
1349 struct ieee80211_sub_if_data *sdata = rx->sdata;
1350 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1351 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1352 int tid, ac;
1353
1354 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1355 return RX_CONTINUE;
1356
1357 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1358 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1359 return RX_CONTINUE;
1360
1361 /*
1362 * The device handles station powersave, so don't do anything about
1363 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1364 * it to mac80211 since they're handled.)
1365 */
1366 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1367 return RX_CONTINUE;
1368
1369 /*
1370 * Don't do anything if the station isn't already asleep. In
1371 * the uAPSD case, the station will probably be marked asleep,
1372 * in the PS-Poll case the station must be confused ...
1373 */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001374 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
Johannes Berg47086fc2011-09-29 16:04:33 +02001375 return RX_CONTINUE;
1376
1377 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001378 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1379 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
Johannes Bergdeeaee12011-09-29 16:04:35 +02001380 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1381 else
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001382 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
Johannes Bergdeeaee12011-09-29 16:04:35 +02001383 }
Johannes Berg47086fc2011-09-29 16:04:33 +02001384
1385 /* Free PS Poll skb here instead of returning RX_DROP that would
1386 * count as an dropped frame. */
1387 dev_kfree_skb(rx->skb);
1388
1389 return RX_QUEUED;
1390 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1391 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1392 ieee80211_has_pm(hdr->frame_control) &&
1393 (ieee80211_is_data_qos(hdr->frame_control) ||
1394 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1395 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1396 ac = ieee802_1d_to_ac[tid & 7];
1397
1398 /*
1399 * If this AC is not trigger-enabled do nothing.
1400 *
1401 * NB: This could/should check a separate bitmap of trigger-
1402 * enabled queues, but for now we only implement uAPSD w/o
1403 * TSPEC changes to the ACs, so they're always the same.
1404 */
1405 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1406 return RX_CONTINUE;
1407
1408 /* if we are in a service period, do nothing */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001409 if (test_sta_flag(rx->sta, WLAN_STA_SP))
Johannes Berg47086fc2011-09-29 16:04:33 +02001410 return RX_CONTINUE;
1411
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001412 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
Johannes Berg47086fc2011-09-29 16:04:33 +02001413 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1414 else
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001415 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
Johannes Berg47086fc2011-09-29 16:04:33 +02001416 }
1417
1418 return RX_CONTINUE;
1419}
1420
1421static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001422ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001423{
1424 struct sta_info *sta = rx->sta;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001425 struct sk_buff *skb = rx->skb;
1426 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1427 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Felix Fietkauef0621e2013-04-22 16:29:31 +02001428 int i;
Johannes Berg571ecf62007-07-27 15:43:22 +02001429
1430 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001431 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001432
Johannes Bergb291ba12009-07-10 15:29:03 +02001433 /*
1434 * Update last_rx only for IBSS packets which are for the current
Antonio Quartullie584da5e2012-11-25 23:13:42 +01001435 * BSSID and for station already AUTHORIZED to avoid keeping the
1436 * current IBSS network alive in cases where other STAs start
1437 * using different BSSID. This will also give the station another
1438 * chance to restart the authentication/authorization in case
1439 * something went wrong the first time.
Johannes Bergb291ba12009-07-10 15:29:03 +02001440 */
Johannes Berg05c914f2008-09-11 00:01:58 +02001441 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001442 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +02001443 NL80211_IFTYPE_ADHOC);
Antonio Quartullie584da5e2012-11-25 23:13:42 +01001444 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1445 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001446 sta->last_rx = jiffies;
Felix Fietkau3af63342011-02-27 22:08:01 +01001447 if (ieee80211_is_data(hdr->frame_control)) {
1448 sta->last_rx_rate_idx = status->rate_idx;
1449 sta->last_rx_rate_flag = status->flag;
Johannes Berg56146182012-11-09 15:07:02 +01001450 sta->last_rx_rate_vht_nss = status->vht_nss;
Felix Fietkau3af63342011-02-27 22:08:01 +01001451 }
1452 }
Johannes Bergb291ba12009-07-10 15:29:03 +02001453 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1454 /*
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001455 * Mesh beacons will update last_rx when if they are found to
1456 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +02001457 */
Johannes Bergb291ba12009-07-10 15:29:03 +02001458 sta->last_rx = jiffies;
Felix Fietkau3af63342011-02-27 22:08:01 +01001459 if (ieee80211_is_data(hdr->frame_control)) {
1460 sta->last_rx_rate_idx = status->rate_idx;
1461 sta->last_rx_rate_flag = status->flag;
Johannes Berg56146182012-11-09 15:07:02 +01001462 sta->last_rx_rate_vht_nss = status->vht_nss;
Felix Fietkau3af63342011-02-27 22:08:01 +01001463 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001464 }
1465
Johannes Berg554891e2010-09-24 12:38:25 +02001466 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001467 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001468
Kalle Valo3cf335d2009-03-22 21:57:06 +02001469 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1470 ieee80211_sta_rx_notify(rx->sdata, hdr);
1471
Johannes Berg571ecf62007-07-27 15:43:22 +02001472 sta->rx_fragments++;
1473 sta->rx_bytes += rx->skb->len;
Felix Fietkaufe8431f2012-03-01 18:00:07 +01001474 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1475 sta->last_signal = status->signal;
1476 ewma_add(&sta->avg_signal, -status->signal);
1477 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001478
Felix Fietkauef0621e2013-04-22 16:29:31 +02001479 if (status->chains) {
1480 sta->chains = status->chains;
1481 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1482 int signal = status->chain_signal[i];
1483
1484 if (!(status->chains & BIT(i)))
1485 continue;
1486
1487 sta->chain_signal_last[i] = signal;
1488 ewma_add(&sta->chain_signal_avg[i], -signal);
1489 }
1490 }
1491
Johannes Berg72eaa432008-11-26 15:02:58 +01001492 /*
1493 * Change STA power saving mode only at the end of a frame
1494 * exchange sequence.
1495 */
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001496 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1497 !ieee80211_has_morefrags(hdr->frame_control) &&
Christian Lamparter4cfda472010-12-27 23:21:26 +01001498 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001499 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1500 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001501 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
Johannes Berg72eaa432008-11-26 15:02:58 +01001502 /*
1503 * Ignore doze->wake transitions that are
1504 * indicated by non-data frames, the standard
1505 * is unclear here, but for example going to
1506 * PS mode and then scanning would cause a
1507 * doze->wake transition for the probe request,
1508 * and that is clearly undesirable.
1509 */
1510 if (ieee80211_is_data(hdr->frame_control) &&
1511 !ieee80211_has_pm(hdr->frame_control))
Marco Porschd012a602012-10-10 12:39:50 -07001512 sta_ps_end(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001513 } else {
1514 if (ieee80211_has_pm(hdr->frame_control))
Marco Porschd012a602012-10-10 12:39:50 -07001515 sta_ps_start(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001516 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001517 }
1518
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001519 /* mesh power save support */
1520 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1521 ieee80211_mps_rx_h_sta_process(sta, hdr);
1522
Johannes Berg22403de2009-10-30 12:55:03 +01001523 /*
1524 * Drop (qos-)data::nullfunc frames silently, since they
1525 * are used only to control station power saving mode.
1526 */
1527 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1528 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001529 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
Felix Fietkaud5242152010-01-08 18:06:26 +01001530
1531 /*
1532 * If we receive a 4-addr nullfunc frame from a STA
Johannes Berge7f4a942011-11-04 11:18:20 +01001533 * that was not moved to a 4-addr STA vlan yet send
1534 * the event to userspace and for older hostapd drop
1535 * the frame to the monitor interface.
Felix Fietkaud5242152010-01-08 18:06:26 +01001536 */
1537 if (ieee80211_has_a4(hdr->frame_control) &&
1538 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1539 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
Johannes Berge7f4a942011-11-04 11:18:20 +01001540 !rx->sdata->u.vlan.sta))) {
1541 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1542 cfg80211_rx_unexpected_4addr_frame(
1543 rx->sdata->dev, sta->sta.addr,
1544 GFP_ATOMIC);
Felix Fietkaud5242152010-01-08 18:06:26 +01001545 return RX_DROP_MONITOR;
Johannes Berge7f4a942011-11-04 11:18:20 +01001546 }
Johannes Berg22403de2009-10-30 12:55:03 +01001547 /*
1548 * Update counter and free packet here to avoid
1549 * counting this as a dropped packed.
1550 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001551 sta->rx_packets++;
1552 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001553 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001554 }
1555
Johannes Berg9ae54c82008-01-31 19:48:20 +01001556 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001557} /* ieee80211_rx_h_sta_process */
1558
Johannes Berg571ecf62007-07-27 15:43:22 +02001559static inline struct ieee80211_fragment_entry *
1560ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1561 unsigned int frag, unsigned int seq, int rx_queue,
1562 struct sk_buff **skb)
1563{
1564 struct ieee80211_fragment_entry *entry;
Johannes Berg571ecf62007-07-27 15:43:22 +02001565
Johannes Berg571ecf62007-07-27 15:43:22 +02001566 entry = &sdata->fragments[sdata->fragment_next++];
1567 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1568 sdata->fragment_next = 0;
1569
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001570 if (!skb_queue_empty(&entry->skb_list))
Johannes Berg571ecf62007-07-27 15:43:22 +02001571 __skb_queue_purge(&entry->skb_list);
Johannes Berg571ecf62007-07-27 15:43:22 +02001572
1573 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1574 *skb = NULL;
1575 entry->first_frag_time = jiffies;
1576 entry->seq = seq;
1577 entry->rx_queue = rx_queue;
1578 entry->last_frag = frag;
1579 entry->ccmp = 0;
1580 entry->extra_len = 0;
1581
1582 return entry;
1583}
1584
1585static inline struct ieee80211_fragment_entry *
1586ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001587 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +02001588 int rx_queue, struct ieee80211_hdr *hdr)
1589{
1590 struct ieee80211_fragment_entry *entry;
1591 int i, idx;
1592
1593 idx = sdata->fragment_next;
1594 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1595 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +02001596
1597 idx--;
1598 if (idx < 0)
1599 idx = IEEE80211_FRAGMENT_MAX - 1;
1600
1601 entry = &sdata->fragments[idx];
1602 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1603 entry->rx_queue != rx_queue ||
1604 entry->last_frag + 1 != frag)
1605 continue;
1606
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001607 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001608
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001609 /*
1610 * Check ftype and addresses are equal, else check next fragment
1611 */
1612 if (((hdr->frame_control ^ f_hdr->frame_control) &
1613 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Joe Perchesb203ca32012-05-08 18:56:52 +00001614 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1615 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
Johannes Berg571ecf62007-07-27 15:43:22 +02001616 continue;
1617
S.Çağlar Onurab466232008-02-14 17:36:47 +02001618 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001619 __skb_queue_purge(&entry->skb_list);
1620 continue;
1621 }
1622 return entry;
1623 }
1624
1625 return NULL;
1626}
1627
Johannes Berg49461622008-06-30 15:10:45 +02001628static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001629ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001630{
1631 struct ieee80211_hdr *hdr;
1632 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001633 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001634 unsigned int frag, seq;
1635 struct ieee80211_fragment_entry *entry;
1636 struct sk_buff *skb;
Johannes Berg554891e2010-09-24 12:38:25 +02001637 struct ieee80211_rx_status *status;
Johannes Berg571ecf62007-07-27 15:43:22 +02001638
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001639 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001640 fc = hdr->frame_control;
Javier Cardonaf7fbf702012-10-25 11:10:18 -07001641
1642 if (ieee80211_is_ctl(fc))
1643 return RX_CONTINUE;
1644
Johannes Berg571ecf62007-07-27 15:43:22 +02001645 sc = le16_to_cpu(hdr->seq_ctrl);
1646 frag = sc & IEEE80211_SCTL_FRAG;
1647
Harvey Harrison358c8d92008-07-15 18:44:13 -07001648 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001649 is_multicast_ether_addr(hdr->addr1))) {
1650 /* not fragmented */
1651 goto out;
1652 }
1653 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1654
Zhu Yie3cf8b32010-03-29 17:35:07 +08001655 if (skb_linearize(rx->skb))
1656 return RX_DROP_UNUSABLE;
1657
Abhijeet Kolekar058897a2010-05-11 11:22:11 -07001658 /*
1659 * skb_linearize() might change the skb->data and
1660 * previously cached variables (in this case, hdr) need to
1661 * be refreshed with the new data.
1662 */
1663 hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001664 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1665
1666 if (frag == 0) {
1667 /* This is the first fragment of a new frame. */
1668 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg9e262972011-07-07 18:45:03 +02001669 rx->seqno_idx, &(rx->skb));
Johannes Berg97359d12010-08-10 09:46:38 +02001670 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
Harvey Harrison358c8d92008-07-15 18:44:13 -07001671 ieee80211_has_protected(fc)) {
Johannes Berg9e262972011-07-07 18:45:03 +02001672 int queue = rx->security_idx;
Johannes Berg571ecf62007-07-27 15:43:22 +02001673 /* Store CCMP PN so that we can verify that the next
1674 * fragment has a sequential PN value. */
1675 entry->ccmp = 1;
1676 memcpy(entry->last_pn,
Jouni Malinen91902522010-06-11 10:27:33 -07001677 rx->key->u.ccmp.rx_pn[queue],
Johannes Berg4325f6c2013-05-08 13:09:08 +02001678 IEEE80211_CCMP_PN_LEN);
Johannes Berg571ecf62007-07-27 15:43:22 +02001679 }
Johannes Berg9ae54c82008-01-31 19:48:20 +01001680 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001681 }
1682
1683 /* This is a fragment for a frame that should already be pending in
1684 * fragment cache. Add this fragment to the end of the pending entry.
1685 */
Johannes Berg9e262972011-07-07 18:45:03 +02001686 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1687 rx->seqno_idx, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001688 if (!entry) {
1689 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001690 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001691 }
1692
1693 /* Verify that MPDUs within one MSDU have sequential PN values.
1694 * (IEEE 802.11i, 8.3.3.4.5) */
1695 if (entry->ccmp) {
1696 int i;
Johannes Berg4325f6c2013-05-08 13:09:08 +02001697 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
Jouni Malinen91902522010-06-11 10:27:33 -07001698 int queue;
Johannes Berg97359d12010-08-10 09:46:38 +02001699 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001700 return RX_DROP_UNUSABLE;
Johannes Berg4325f6c2013-05-08 13:09:08 +02001701 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1702 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001703 pn[i]++;
1704 if (pn[i])
1705 break;
1706 }
Johannes Berg9e262972011-07-07 18:45:03 +02001707 queue = rx->security_idx;
Jouni Malinen91902522010-06-11 10:27:33 -07001708 rpn = rx->key->u.ccmp.rx_pn[queue];
Johannes Berg4325f6c2013-05-08 13:09:08 +02001709 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001710 return RX_DROP_UNUSABLE;
Johannes Berg4325f6c2013-05-08 13:09:08 +02001711 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
Johannes Berg571ecf62007-07-27 15:43:22 +02001712 }
1713
Harvey Harrison358c8d92008-07-15 18:44:13 -07001714 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +02001715 __skb_queue_tail(&entry->skb_list, rx->skb);
1716 entry->last_frag = frag;
1717 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001718 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001719 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001720 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001721 }
1722
1723 rx->skb = __skb_dequeue(&entry->skb_list);
1724 if (skb_tailroom(rx->skb) < entry->extra_len) {
1725 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1726 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1727 GFP_ATOMIC))) {
1728 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1729 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001730 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001731 }
1732 }
1733 while ((skb = __skb_dequeue(&entry->skb_list))) {
1734 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1735 dev_kfree_skb(skb);
1736 }
1737
1738 /* Complete frame has been reassembled - process it now */
Johannes Berg554891e2010-09-24 12:38:25 +02001739 status = IEEE80211_SKB_RXCB(rx->skb);
1740 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001741
1742 out:
1743 if (rx->sta)
1744 rx->sta->rx_packets++;
1745 if (is_multicast_ether_addr(hdr->addr1))
1746 rx->local->dot11MulticastReceivedFrameCount++;
1747 else
1748 ieee80211_led_rx(rx->local);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001749 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001750}
1751
Johannes Berg1df332e2012-10-26 00:09:11 +02001752static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001753{
Johannes Berg1df332e2012-10-26 00:09:11 +02001754 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001755 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001756
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001757 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001758}
1759
Johannes Berg1df332e2012-10-26 00:09:11 +02001760static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02001761{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001762 struct sk_buff *skb = rx->skb;
1763 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1764
Johannes Berg3017b802007-08-28 17:01:53 -04001765 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001766 * Pass through unencrypted frames if the hardware has
1767 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001768 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001769 if (status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001770 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001771
1772 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001773 if (unlikely(!ieee80211_has_protected(fc) &&
1774 !ieee80211_is_nullfunc(fc) &&
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001775 ieee80211_is_data(fc) &&
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001776 (rx->key || rx->sdata->drop_unencrypted)))
1777 return -EACCES;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001778
1779 return 0;
1780}
1781
Johannes Berg1df332e2012-10-26 00:09:11 +02001782static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001783{
1784 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Jouni Malinene3efca02010-03-28 22:31:15 -07001785 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001786 __le16 fc = hdr->frame_control;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001787
Jouni Malinene3efca02010-03-28 22:31:15 -07001788 /*
1789 * Pass through unencrypted frames if the hardware has
1790 * decrypted them already.
1791 */
1792 if (status->flag & RX_FLAG_DECRYPTED)
1793 return 0;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001794
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001795 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
Jouni Malinend211e902010-03-28 22:29:52 -07001796 if (unlikely(!ieee80211_has_protected(fc) &&
1797 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02001798 rx->key)) {
Johannes Berg6ff57cf2013-05-16 00:55:00 +02001799 if (ieee80211_is_deauth(fc) ||
1800 ieee80211_is_disassoc(fc))
1801 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1802 rx->skb->data,
1803 rx->skb->len);
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001804 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02001805 }
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001806 /* BIP does not use Protected field, so need to check MMIE */
Joe Perchesf64f9e72009-11-29 16:55:45 -08001807 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02001808 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
Johannes Berg6ff57cf2013-05-16 00:55:00 +02001809 if (ieee80211_is_deauth(fc) ||
1810 ieee80211_is_disassoc(fc))
1811 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1812 rx->skb->data,
1813 rx->skb->len);
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001814 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02001815 }
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001816 /*
1817 * When using MFP, Action frames are not allowed prior to
1818 * having configured keys.
1819 */
1820 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1821 ieee80211_is_robust_mgmt_frame(
1822 (struct ieee80211_hdr *) rx->skb->data)))
1823 return -EACCES;
1824 }
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001825
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001826 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001827}
1828
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001829static int
Felix Fietkau4114fa22011-04-12 19:15:22 +02001830__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
Johannes Berg571ecf62007-07-27 15:43:22 +02001831{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001832 struct ieee80211_sub_if_data *sdata = rx->sdata;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001833 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001834 bool check_port_control = false;
1835 struct ethhdr *ehdr;
1836 int ret;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001837
Felix Fietkau4114fa22011-04-12 19:15:22 +02001838 *port_control = false;
Johannes Berg9bc383d2009-11-19 11:55:19 +01001839 if (ieee80211_has_a4(hdr->frame_control) &&
1840 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001841 return -1;
Johannes Berg9bc383d2009-11-19 11:55:19 +01001842
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001843 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1844 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1845
1846 if (!sdata->u.mgd.use_4addr)
1847 return -1;
1848 else
1849 check_port_control = true;
1850 }
1851
Johannes Berg9bc383d2009-11-19 11:55:19 +01001852 if (is_multicast_ether_addr(hdr->addr1) &&
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001853 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001854 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001855
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001856 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
Felix Fietkau4114fa22011-04-12 19:15:22 +02001857 if (ret < 0)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001858 return ret;
1859
1860 ehdr = (struct ethhdr *) rx->skb->data;
Felix Fietkau4114fa22011-04-12 19:15:22 +02001861 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1862 *port_control = true;
1863 else if (check_port_control)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001864 return -1;
1865
1866 return 0;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001867}
Johannes Berg571ecf62007-07-27 15:43:22 +02001868
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001869/*
1870 * requires that rx->skb is a frame with ethernet header
1871 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001872static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001873{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301874 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001875 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1876 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1877
1878 /*
1879 * Allow EAPOL frames to us/the PAE group address regardless
1880 * of whether the frame was encrypted or not.
1881 */
Johannes Berga621fa42010-08-27 14:26:54 +03001882 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
Joe Perches3bc79452012-05-08 18:56:53 +00001883 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1884 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001885 return true;
1886
1887 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07001888 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001889 return false;
1890
1891 return true;
1892}
1893
1894/*
1895 * requires that rx->skb is a frame with ethernet header
1896 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001897static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01001898ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001899{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001900 struct ieee80211_sub_if_data *sdata = rx->sdata;
1901 struct net_device *dev = sdata->dev;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001902 struct sk_buff *skb, *xmit_skb;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001903 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1904 struct sta_info *dsta;
Johannes Berg554891e2010-09-24 12:38:25 +02001905 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001906
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001907 skb = rx->skb;
1908 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001909
Johannes Berg05c914f2008-09-11 00:01:58 +02001910 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1911 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02001912 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg554891e2010-09-24 12:38:25 +02001913 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
Johannes Berg9bc383d2009-11-19 11:55:19 +01001914 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001915 if (is_multicast_ether_addr(ehdr->h_dest)) {
1916 /*
1917 * send multicast frames both to higher layers in
1918 * local net stack and back to the wireless medium
1919 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001920 xmit_skb = skb_copy(skb, GFP_ATOMIC);
Joe Perchese87cc472012-05-13 21:56:26 +00001921 if (!xmit_skb)
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001922 net_info_ratelimited("%s: failed to clone multicast frame\n",
Joe Perchese87cc472012-05-13 21:56:26 +00001923 dev->name);
Johannes Berg571ecf62007-07-27 15:43:22 +02001924 } else {
Johannes Bergabe60632009-11-25 17:46:18 +01001925 dsta = sta_info_get(sdata, skb->data);
1926 if (dsta) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001927 /*
1928 * The destination station is associated to
1929 * this AP (in this VLAN), so send the frame
1930 * directly to it and do not pass it to local
1931 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02001932 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001933 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001934 skb = NULL;
1935 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001936 }
1937 }
1938
1939 if (skb) {
Johannes Bergd1c3a372009-01-07 00:26:10 +01001940 int align __maybe_unused;
1941
Kalle Valo59d9cb02009-12-17 13:54:57 +01001942#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
Johannes Bergd1c3a372009-01-07 00:26:10 +01001943 /*
1944 * 'align' will only take the values 0 or 2 here
1945 * since all frames are required to be aligned
1946 * to 2-byte boundaries when being passed to
Johannes Berg191922c2013-02-20 21:44:12 +01001947 * mac80211; the code here works just as well if
1948 * that isn't true, but mac80211 assumes it can
1949 * access fields as 2-byte aligned (e.g. for
1950 * compare_ether_addr)
Johannes Bergd1c3a372009-01-07 00:26:10 +01001951 */
matthieu castetdacb6f12009-06-04 22:16:18 +02001952 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01001953 if (align) {
1954 if (WARN_ON(skb_headroom(skb) < 3)) {
1955 dev_kfree_skb(skb);
1956 skb = NULL;
1957 } else {
1958 u8 *data = skb->data;
Zhu Yi8ce0b582009-10-28 13:13:52 -07001959 size_t len = skb_headlen(skb);
1960 skb->data -= align;
1961 memmove(skb->data, data, len);
1962 skb_set_tail_pointer(skb, len);
Johannes Bergd1c3a372009-01-07 00:26:10 +01001963 }
1964 }
1965#endif
1966
1967 if (skb) {
1968 /* deliver to local stack */
1969 skb->protocol = eth_type_trans(skb, dev);
1970 memset(skb->cb, 0, sizeof(skb->cb));
John W. Linville5548a8a2010-06-24 14:25:56 -04001971 netif_receive_skb(skb);
Johannes Bergd1c3a372009-01-07 00:26:10 +01001972 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001973 }
1974
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001975 if (xmit_skb) {
Helmut Schaaaef6c922011-12-21 09:11:35 +01001976 /*
1977 * Send to wireless media and increase priority by 256 to
1978 * keep the received priority instead of reclassifying
1979 * the frame (see cfg80211_classify8021d).
1980 */
1981 xmit_skb->priority += 256;
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09001982 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001983 skb_reset_network_header(xmit_skb);
1984 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001985 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001986 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001987}
1988
Johannes Berg49461622008-06-30 15:10:45 +02001989static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001990ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001991{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001992 struct net_device *dev = rx->sdata->dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001993 struct sk_buff *skb = rx->skb;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001994 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1995 __le16 fc = hdr->frame_control;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001996 struct sk_buff_head frame_list;
Johannes Berg554891e2010-09-24 12:38:25 +02001997 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001998
Harvey Harrison358c8d92008-07-15 18:44:13 -07001999 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002000 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002001
Harvey Harrison358c8d92008-07-15 18:44:13 -07002002 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002003 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002004
Johannes Berg554891e2010-09-24 12:38:25 +02002005 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002006 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002007
Zhu Yieaf85ca2009-12-01 10:18:37 +08002008 if (ieee80211_has_a4(hdr->frame_control) &&
2009 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2010 !rx->sdata->u.vlan.sta)
2011 return RX_DROP_UNUSABLE;
2012
2013 if (is_multicast_ether_addr(hdr->addr1) &&
2014 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2015 rx->sdata->u.vlan.sta) ||
2016 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2017 rx->sdata->u.mgd.use_4addr)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002018 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002019
2020 skb->dev = dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08002021 __skb_queue_head_init(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002022
Zhu Yie3cf8b32010-03-29 17:35:07 +08002023 if (skb_linearize(skb))
2024 return RX_DROP_UNUSABLE;
2025
Zhu Yieaf85ca2009-12-01 10:18:37 +08002026 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2027 rx->sdata->vif.type,
Yogesh Ashok Powar8b3beca2011-05-13 11:22:31 -07002028 rx->local->hw.extra_tx_headroom, true);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002029
Zhu Yieaf85ca2009-12-01 10:18:37 +08002030 while (!skb_queue_empty(&frame_list)) {
2031 rx->skb = __skb_dequeue(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002032
Harvey Harrison358c8d92008-07-15 18:44:13 -07002033 if (!ieee80211_frame_allowed(rx, fc)) {
Zhu Yieaf85ca2009-12-01 10:18:37 +08002034 dev_kfree_skb(rx->skb);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002035 continue;
2036 }
Zhu Yieaf85ca2009-12-01 10:18:37 +08002037 dev->stats.rx_packets++;
2038 dev->stats.rx_bytes += rx->skb->len;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002039
2040 ieee80211_deliver_skb(rx);
2041 }
2042
Johannes Berg9ae54c82008-01-31 19:48:20 +01002043 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002044}
2045
Ingo Molnarbf94e172008-10-12 23:51:38 -07002046#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02002047static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002048ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2049{
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002050 struct ieee80211_hdr *fwd_hdr, *hdr;
2051 struct ieee80211_tx_info *info;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002052 struct ieee80211s_hdr *mesh_hdr;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002053 struct sk_buff *skb = rx->skb, *fwd_skb;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002054 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002055 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02002056 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002057 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Thomas Pedersen0cfda852011-11-24 17:15:25 -08002058 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002059 u16 q, hdrlen;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002060
2061 hdr = (struct ieee80211_hdr *) skb->data;
2062 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg9b395bc2012-10-26 00:36:40 +02002063
2064 /* make sure fixed part of mesh header is there, also checks skb len */
2065 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2066 return RX_DROP_MONITOR;
2067
2068 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2069
2070 /* make sure full mesh header is there, also checks skb len */
2071 if (!pskb_may_pull(rx->skb,
2072 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2073 return RX_DROP_MONITOR;
2074
2075 /* reload pointers */
2076 hdr = (struct ieee80211_hdr *) skb->data;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002077 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2078
Thomas Pedersen2157fdd2011-09-01 12:32:14 -07002079 /* frame is in RMC, don't forward */
2080 if (ieee80211_is_data(hdr->frame_control) &&
2081 is_multicast_ether_addr(hdr->addr1) &&
Johannes Bergbf7cd942013-02-15 14:40:31 +01002082 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
Thomas Pedersen2157fdd2011-09-01 12:32:14 -07002083 return RX_DROP_MONITOR;
2084
Javier Cardona555cb712012-10-24 12:43:30 -07002085 if (!ieee80211_is_data(hdr->frame_control) ||
2086 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002087 return RX_CONTINUE;
2088
2089 if (!mesh_hdr->ttl)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002090 return RX_DROP_MONITOR;
2091
Javier Cardona43b7b312009-10-15 18:10:51 -07002092 if (mesh_hdr->flags & MESH_FLAGS_AE) {
YanBo79617de2008-09-22 13:30:32 +08002093 struct mesh_path *mppath;
Javier Cardona43b7b312009-10-15 18:10:51 -07002094 char *proxied_addr;
2095 char *mpp_addr;
2096
2097 if (is_multicast_ether_addr(hdr->addr1)) {
2098 mpp_addr = hdr->addr3;
2099 proxied_addr = mesh_hdr->eaddr1;
Johannes Berg9b395bc2012-10-26 00:36:40 +02002100 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2101 /* has_a4 already checked in ieee80211_rx_mesh_check */
Javier Cardona43b7b312009-10-15 18:10:51 -07002102 mpp_addr = hdr->addr4;
2103 proxied_addr = mesh_hdr->eaddr2;
Johannes Berg9b395bc2012-10-26 00:36:40 +02002104 } else {
2105 return RX_DROP_MONITOR;
Javier Cardona43b7b312009-10-15 18:10:51 -07002106 }
YanBo79617de2008-09-22 13:30:32 +08002107
YanBo79617de2008-09-22 13:30:32 +08002108 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +01002109 mppath = mpp_path_lookup(sdata, proxied_addr);
YanBo79617de2008-09-22 13:30:32 +08002110 if (!mppath) {
Johannes Bergbf7cd942013-02-15 14:40:31 +01002111 mpp_path_add(sdata, proxied_addr, mpp_addr);
YanBo79617de2008-09-22 13:30:32 +08002112 } else {
2113 spin_lock_bh(&mppath->state_lock);
Joe Perchesb203ca32012-05-08 18:56:52 +00002114 if (!ether_addr_equal(mppath->mpp, mpp_addr))
Javier Cardona43b7b312009-10-15 18:10:51 -07002115 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
YanBo79617de2008-09-22 13:30:32 +08002116 spin_unlock_bh(&mppath->state_lock);
2117 }
2118 rcu_read_unlock();
2119 }
2120
Javier Cardona3c5772a2009-08-10 12:15:48 -07002121 /* Frame has reached destination. Don't forward */
2122 if (!is_multicast_ether_addr(hdr->addr1) &&
Joe Perchesb203ca32012-05-08 18:56:52 +00002123 ether_addr_equal(sdata->vif.addr, hdr->addr3))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002124 return RX_CONTINUE;
2125
Yoni Divinsky00e96de2012-06-20 15:39:13 +03002126 q = ieee80211_select_queue_80211(sdata, skb, hdr);
Thomas Pedersend3c15972011-11-24 17:15:23 -08002127 if (ieee80211_queue_stopped(&local->hw, q)) {
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002128 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
Thomas Pedersend3c15972011-11-24 17:15:23 -08002129 return RX_DROP_MONITOR;
2130 }
2131 skb_set_queue_mapping(skb, q);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002132
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002133 if (!--mesh_hdr->ttl) {
2134 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
Javier Cardona2ac64cd2012-10-24 12:43:31 -07002135 goto out;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002136 }
2137
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +08002138 if (!ifmsh->mshcfg.dot11MeshForwarding)
2139 goto out;
2140
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002141 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2142 if (!fwd_skb) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02002143 net_info_ratelimited("%s: failed to clone mesh frame\n",
Joe Perchese87cc472012-05-13 21:56:26 +00002144 sdata->name);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002145 goto out;
2146 }
2147
2148 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
Thomas Pedersen9d6d6f42013-04-08 11:06:12 -07002149 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002150 info = IEEE80211_SKB_CB(fwd_skb);
2151 memset(info, 0, sizeof(*info));
2152 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2153 info->control.vif = &rx->sdata->vif;
2154 info->control.jiffies = jiffies;
2155 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2156 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2157 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
Marco Porsch3f52b7e2013-01-30 18:14:08 +01002158 /* update power mode indication when forwarding */
2159 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
Johannes Bergbf7cd942013-02-15 14:40:31 +01002160 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
Marco Porsch3f52b7e2013-01-30 18:14:08 +01002161 /* mesh power mode flags updated in mesh_nexthop_lookup */
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002162 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2163 } else {
2164 /* unable to resolve next hop */
Johannes Bergbf7cd942013-02-15 14:40:31 +01002165 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2166 fwd_hdr->addr3, 0, reason, fwd_hdr->addr2);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002167 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
Jesper Juhl74b8cc32012-01-14 21:52:17 +01002168 kfree_skb(fwd_skb);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002169 return RX_DROP_MONITOR;
2170 }
2171
2172 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2173 ieee80211_add_pending_skb(local, fwd_skb);
Johannes Bergb51aff02010-12-22 10:15:07 +01002174 out:
Javier Cardona3c5772a2009-08-10 12:15:48 -07002175 if (is_multicast_ether_addr(hdr->addr1) ||
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002176 sdata->dev->flags & IFF_PROMISC)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002177 return RX_CONTINUE;
2178 else
2179 return RX_DROP_MONITOR;
2180}
Ingo Molnarbf94e172008-10-12 23:51:38 -07002181#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002182
2183static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002184ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002185{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002186 struct ieee80211_sub_if_data *sdata = rx->sdata;
Vivek Natarajane15276a2010-02-08 17:47:01 +05302187 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002188 struct net_device *dev = sdata->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07002189 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2190 __le16 fc = hdr->frame_control;
Felix Fietkau4114fa22011-04-12 19:15:22 +02002191 bool port_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002192 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002193
Harvey Harrison358c8d92008-07-15 18:44:13 -07002194 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002195 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002196
Harvey Harrison358c8d92008-07-15 18:44:13 -07002197 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002198 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002199
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002200 /*
Johannes Berge7f4a942011-11-04 11:18:20 +01002201 * Send unexpected-4addr-frame event to hostapd. For older versions,
2202 * also drop the frame to cooked monitor interfaces.
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002203 */
2204 if (ieee80211_has_a4(hdr->frame_control) &&
Johannes Berge7f4a942011-11-04 11:18:20 +01002205 sdata->vif.type == NL80211_IFTYPE_AP) {
2206 if (rx->sta &&
2207 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2208 cfg80211_rx_unexpected_4addr_frame(
2209 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002210 return RX_DROP_MONITOR;
Johannes Berge7f4a942011-11-04 11:18:20 +01002211 }
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002212
Felix Fietkau4114fa22011-04-12 19:15:22 +02002213 err = __ieee80211_data_to_8023(rx, &port_control);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002214 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002215 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002216
Harvey Harrison358c8d92008-07-15 18:44:13 -07002217 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002218 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002219
Felix Fietkau4114fa22011-04-12 19:15:22 +02002220 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2221 unlikely(port_control) && sdata->bss) {
2222 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2223 u.ap);
2224 dev = sdata->dev;
2225 rx->sdata = sdata;
2226 }
2227
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002228 rx->skb->dev = dev;
2229
2230 dev->stats.rx_packets++;
2231 dev->stats.rx_bytes += rx->skb->len;
2232
Helmut Schaa08ca9442010-11-30 12:19:34 +01002233 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
Rajkumar Manoharan8c99f692011-02-02 22:57:53 +05302234 !is_multicast_ether_addr(
2235 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2236 (!local->scanning &&
2237 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
Vivek Natarajane15276a2010-02-08 17:47:01 +05302238 mod_timer(&local->dynamic_ps_timer, jiffies +
2239 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2240 }
2241
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002242 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02002243
Johannes Berg9ae54c82008-01-31 19:48:20 +01002244 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002245}
2246
Johannes Berg49461622008-06-30 15:10:45 +02002247static ieee80211_rx_result debug_noinline
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002248ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
Ron Rindjunsky71364712007-12-25 17:00:36 +02002249{
Ron Rindjunsky71364712007-12-25 17:00:36 +02002250 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002251 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002252 struct tid_ampdu_rx *tid_agg_rx;
2253 u16 start_seq_num;
2254 u16 tid;
2255
Harvey Harrisona7767f92008-07-02 16:30:51 -07002256 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002257 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002258
Harvey Harrisona7767f92008-07-02 16:30:51 -07002259 if (ieee80211_is_back_req(bar->frame_control)) {
Johannes Berg8ae59772010-05-30 14:52:58 +02002260 struct {
2261 __le16 control, start_seq_num;
2262 } __packed bar_data;
2263
Ron Rindjunsky71364712007-12-25 17:00:36 +02002264 if (!rx->sta)
Johannes Berga02ae752009-11-16 12:00:40 +01002265 return RX_DROP_MONITOR;
Johannes Berg8ae59772010-05-30 14:52:58 +02002266
2267 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2268 &bar_data, sizeof(bar_data)))
2269 return RX_DROP_MONITOR;
2270
Johannes Berg8ae59772010-05-30 14:52:58 +02002271 tid = le16_to_cpu(bar_data.control) >> 12;
Johannes Berga87f7362010-06-10 10:21:38 +02002272
2273 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2274 if (!tid_agg_rx)
Johannes Berga02ae752009-11-16 12:00:40 +01002275 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002276
Johannes Berg8ae59772010-05-30 14:52:58 +02002277 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002278
2279 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01002280 if (tid_agg_rx->timeout)
2281 mod_timer(&tid_agg_rx->session_timer,
2282 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02002283
Johannes Bergdd318572010-11-29 11:09:16 +01002284 spin_lock(&tid_agg_rx->reorder_lock);
Johannes Berga02ae752009-11-16 12:00:40 +01002285 /* release stored frames up to start of BAR */
Johannes Bergd3b2fb52012-06-22 12:48:38 +02002286 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002287 start_seq_num, frames);
Johannes Bergdd318572010-11-29 11:09:16 +01002288 spin_unlock(&tid_agg_rx->reorder_lock);
2289
Johannes Berga02ae752009-11-16 12:00:40 +01002290 kfree_skb(skb);
2291 return RX_QUEUED;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002292 }
2293
Johannes Berg08daeca2010-05-30 14:53:43 +02002294 /*
2295 * After this point, we only want management frames,
2296 * so we can drop all remaining control frames to
2297 * cooked monitor interfaces.
2298 */
2299 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002300}
2301
Jouni Malinenf4f727a2009-01-10 11:46:53 +02002302static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2303 struct ieee80211_mgmt *mgmt,
2304 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02002305{
2306 struct ieee80211_local *local = sdata->local;
2307 struct sk_buff *skb;
2308 struct ieee80211_mgmt *resp;
2309
Joe Perchesb203ca32012-05-08 18:56:52 +00002310 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
Jouni Malinenfea14732009-01-08 13:32:06 +02002311 /* Not to own unicast address */
2312 return;
2313 }
2314
Joe Perchesb203ca32012-05-08 18:56:52 +00002315 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2316 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
Johannes Berg77fdaa12009-07-07 03:45:17 +02002317 /* Not from the current AP or not associated yet. */
Jouni Malinenfea14732009-01-08 13:32:06 +02002318 return;
2319 }
2320
2321 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2322 /* Too short SA Query request frame */
2323 return;
2324 }
2325
2326 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2327 if (skb == NULL)
2328 return;
2329
2330 skb_reserve(skb, local->hw.extra_tx_headroom);
2331 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2332 memset(resp, 0, 24);
2333 memcpy(resp->da, mgmt->sa, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01002334 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01002335 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02002336 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2337 IEEE80211_STYPE_ACTION);
2338 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2339 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2340 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2341 memcpy(resp->u.action.u.sa_query.trans_id,
2342 mgmt->u.action.u.sa_query.trans_id,
2343 WLAN_SA_QUERY_TR_ID_LEN);
2344
Johannes Berg62ae67b2009-11-18 18:42:05 +01002345 ieee80211_tx_skb(sdata, skb);
Jouni Malinenfea14732009-01-08 13:32:06 +02002346}
2347
Johannes Berg49461622008-06-30 15:10:45 +02002348static ieee80211_rx_result debug_noinline
Johannes Berg2e161f72010-08-12 15:38:38 +02002349ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2350{
2351 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002352 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002353
2354 /*
2355 * From here on, look only at management frames.
2356 * Data and control frames are already handled,
2357 * and unknown (reserved) frames are useless.
2358 */
2359 if (rx->skb->len < 24)
2360 return RX_DROP_MONITOR;
2361
2362 if (!ieee80211_is_mgmt(mgmt->frame_control))
2363 return RX_DROP_MONITOR;
2364
Johannes Bergee971922011-11-04 11:18:18 +01002365 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2366 ieee80211_is_beacon(mgmt->frame_control) &&
2367 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
Johannes Berg804483e2012-03-05 22:18:41 +01002368 int sig = 0;
2369
2370 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2371 sig = status->signal;
2372
Johannes Bergee971922011-11-04 11:18:18 +01002373 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2374 rx->skb->data, rx->skb->len,
Ben Greear37c73b52012-10-26 14:49:25 -07002375 status->freq, sig);
Johannes Bergee971922011-11-04 11:18:18 +01002376 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2377 }
2378
Johannes Berg554891e2010-09-24 12:38:25 +02002379 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg2e161f72010-08-12 15:38:38 +02002380 return RX_DROP_MONITOR;
2381
2382 if (ieee80211_drop_unencrypted_mgmt(rx))
2383 return RX_DROP_UNUSABLE;
2384
2385 return RX_CONTINUE;
2386}
2387
2388static ieee80211_rx_result debug_noinline
Johannes Bergde1ede72008-09-09 14:42:50 +02002389ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2390{
2391 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002392 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergde1ede72008-09-09 14:42:50 +02002393 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002394 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergde1ede72008-09-09 14:42:50 +02002395 int len = rx->skb->len;
2396
2397 if (!ieee80211_is_action(mgmt->frame_control))
2398 return RX_CONTINUE;
2399
Jouni Malinen026331c2010-02-15 12:53:10 +02002400 /* drop too small frames */
2401 if (len < IEEE80211_MIN_ACTION_SIZE)
2402 return RX_DROP_UNUSABLE;
2403
Marco Porsch815b8092012-12-05 15:04:26 -08002404 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2405 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED)
Johannes Berg84040802010-02-15 12:46:39 +02002406 return RX_DROP_UNUSABLE;
Johannes Bergde1ede72008-09-09 14:42:50 +02002407
Johannes Berg554891e2010-09-24 12:38:25 +02002408 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg84040802010-02-15 12:46:39 +02002409 return RX_DROP_UNUSABLE;
Johannes Bergde1ede72008-09-09 14:42:50 +02002410
Johannes Bergde1ede72008-09-09 14:42:50 +02002411 switch (mgmt->u.action.category) {
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002412 case WLAN_CATEGORY_HT:
2413 /* reject HT action frames from stations not supporting HT */
2414 if (!rx->sta->sta.ht_cap.ht_supported)
2415 goto invalid;
2416
2417 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2418 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2419 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2420 sdata->vif.type != NL80211_IFTYPE_AP &&
2421 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2422 break;
2423
Johannes Bergec61cd62012-12-28 12:12:10 +01002424 /* verify action & smps_control/chanwidth are present */
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002425 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2426 goto invalid;
2427
2428 switch (mgmt->u.action.u.ht_smps.action) {
2429 case WLAN_HT_ACTION_SMPS: {
2430 struct ieee80211_supported_band *sband;
Johannes Bergaf0ed692013-02-12 14:21:00 +01002431 enum ieee80211_smps_mode smps_mode;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002432
2433 /* convert to HT capability */
2434 switch (mgmt->u.action.u.ht_smps.smps_control) {
2435 case WLAN_HT_SMPS_CONTROL_DISABLED:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002436 smps_mode = IEEE80211_SMPS_OFF;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002437 break;
2438 case WLAN_HT_SMPS_CONTROL_STATIC:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002439 smps_mode = IEEE80211_SMPS_STATIC;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002440 break;
2441 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002442 smps_mode = IEEE80211_SMPS_DYNAMIC;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002443 break;
2444 default:
2445 goto invalid;
2446 }
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002447
2448 /* if no change do nothing */
Johannes Bergaf0ed692013-02-12 14:21:00 +01002449 if (rx->sta->sta.smps_mode == smps_mode)
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002450 goto handled;
Johannes Bergaf0ed692013-02-12 14:21:00 +01002451 rx->sta->sta.smps_mode = smps_mode;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002452
2453 sband = rx->local->hw.wiphy->bands[status->band];
2454
Johannes Berg64f68e52012-03-28 10:58:37 +02002455 rate_control_rate_update(local, sband, rx->sta,
2456 IEEE80211_RC_SMPS_CHANGED);
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002457 goto handled;
2458 }
Johannes Bergec61cd62012-12-28 12:12:10 +01002459 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2460 struct ieee80211_supported_band *sband;
2461 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002462 enum ieee80211_sta_rx_bandwidth new_bw;
Johannes Bergec61cd62012-12-28 12:12:10 +01002463
2464 /* If it doesn't support 40 MHz it can't change ... */
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002465 if (!(rx->sta->sta.ht_cap.cap &
2466 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
Johannes Bergec61cd62012-12-28 12:12:10 +01002467 goto handled;
2468
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002469 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2470 new_bw = IEEE80211_STA_RX_BW_20;
Johannes Bergec61cd62012-12-28 12:12:10 +01002471 else
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002472 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2473
2474 if (rx->sta->sta.bandwidth == new_bw)
2475 goto handled;
Johannes Bergec61cd62012-12-28 12:12:10 +01002476
2477 sband = rx->local->hw.wiphy->bands[status->band];
2478
2479 rate_control_rate_update(local, sband, rx->sta,
2480 IEEE80211_RC_BW_CHANGED);
2481 goto handled;
2482 }
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002483 default:
2484 goto invalid;
2485 }
2486
2487 break;
Johannes Berg1b3a2e42013-03-26 15:17:18 +01002488 case WLAN_CATEGORY_PUBLIC:
2489 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2490 goto invalid;
2491 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2492 break;
2493 if (!rx->sta)
2494 break;
2495 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2496 break;
2497 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2498 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2499 break;
2500 if (len < offsetof(struct ieee80211_mgmt,
2501 u.action.u.ext_chan_switch.variable))
2502 goto invalid;
2503 goto queue;
Johannes Berg0af83d32012-12-27 18:55:36 +01002504 case WLAN_CATEGORY_VHT:
2505 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2506 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2507 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2508 sdata->vif.type != NL80211_IFTYPE_AP &&
2509 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2510 break;
2511
2512 /* verify action code is present */
2513 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2514 goto invalid;
2515
2516 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2517 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2518 u8 opmode;
2519
2520 /* verify opmode is present */
2521 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2522 goto invalid;
2523
2524 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2525
2526 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
Johannes Bergbee7f582013-02-07 22:24:55 +01002527 opmode, status->band,
2528 false);
Johannes Berg0af83d32012-12-27 18:55:36 +01002529 goto handled;
2530 }
2531 default:
2532 break;
2533 }
2534 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002535 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01002536 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
Thomas Pedersenae2772b2011-10-26 14:47:29 -07002537 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
Johannes Berg8abd3f92009-02-10 21:25:47 +01002538 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
Alexander Simon13c40c52011-11-30 16:56:34 +01002539 sdata->vif.type != NL80211_IFTYPE_AP &&
2540 sdata->vif.type != NL80211_IFTYPE_ADHOC)
Johannes Berg84040802010-02-15 12:46:39 +02002541 break;
Johannes Berg8abd3f92009-02-10 21:25:47 +01002542
Jouni Malinen026331c2010-02-15 12:53:10 +02002543 /* verify action_code is present */
2544 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2545 break;
2546
Johannes Bergde1ede72008-09-09 14:42:50 +02002547 switch (mgmt->u.action.u.addba_req.action_code) {
2548 case WLAN_ACTION_ADDBA_REQ:
2549 if (len < (IEEE80211_MIN_ACTION_SIZE +
2550 sizeof(mgmt->u.action.u.addba_req)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002551 goto invalid;
2552 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002553 case WLAN_ACTION_ADDBA_RESP:
2554 if (len < (IEEE80211_MIN_ACTION_SIZE +
2555 sizeof(mgmt->u.action.u.addba_resp)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002556 goto invalid;
2557 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002558 case WLAN_ACTION_DELBA:
2559 if (len < (IEEE80211_MIN_ACTION_SIZE +
2560 sizeof(mgmt->u.action.u.delba)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002561 goto invalid;
2562 break;
2563 default:
2564 goto invalid;
Johannes Bergde1ede72008-09-09 14:42:50 +02002565 }
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002566
Johannes Berg8b58ff82010-06-10 10:21:51 +02002567 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002568 case WLAN_CATEGORY_SPECTRUM_MGMT:
Johannes Berg4797c7b2012-07-26 14:31:19 +02002569 if (status->band != IEEE80211_BAND_5GHZ)
Johannes Berg84040802010-02-15 12:46:39 +02002570 break;
Johannes Berg46900292009-02-15 12:44:28 +01002571
2572 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002573 break;
Johannes Berg46900292009-02-15 12:44:28 +01002574
Jouni Malinen026331c2010-02-15 12:53:10 +02002575 /* verify action_code is present */
2576 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2577 break;
2578
Johannes Berg39192c02008-09-09 14:49:03 +02002579 switch (mgmt->u.action.u.measurement.action_code) {
2580 case WLAN_ACTION_SPCT_MSR_REQ:
2581 if (len < (IEEE80211_MIN_ACTION_SIZE +
2582 sizeof(mgmt->u.action.u.measurement)))
Johannes Berg84040802010-02-15 12:46:39 +02002583 break;
Johannes Berg39192c02008-09-09 14:49:03 +02002584 ieee80211_process_measurement_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002585 goto handled;
Sujithc481ec92009-01-06 09:28:37 +05302586 case WLAN_ACTION_SPCT_CHL_SWITCH:
Johannes Bergcc32abd2009-05-15 11:52:31 +02002587 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002588 break;
Johannes Bergcc32abd2009-05-15 11:52:31 +02002589
Joe Perchesb203ca32012-05-08 18:56:52 +00002590 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
Johannes Berg84040802010-02-15 12:46:39 +02002591 break;
Sujithc481ec92009-01-06 09:28:37 +05302592
Johannes Berg8b58ff82010-06-10 10:21:51 +02002593 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002594 }
2595 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002596 case WLAN_CATEGORY_SA_QUERY:
2597 if (len < (IEEE80211_MIN_ACTION_SIZE +
2598 sizeof(mgmt->u.action.u.sa_query)))
Johannes Berg84040802010-02-15 12:46:39 +02002599 break;
2600
Jouni Malinenfea14732009-01-08 13:32:06 +02002601 switch (mgmt->u.action.u.sa_query.action) {
2602 case WLAN_ACTION_SA_QUERY_REQUEST:
2603 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002604 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002605 ieee80211_process_sa_query_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002606 goto handled;
Jouni Malinenfea14732009-01-08 13:32:06 +02002607 }
2608 break;
Thomas Pedersen8db09852011-08-12 20:01:00 -07002609 case WLAN_CATEGORY_SELF_PROTECTED:
Johannes Berg9b395bc2012-10-26 00:36:40 +02002610 if (len < (IEEE80211_MIN_ACTION_SIZE +
2611 sizeof(mgmt->u.action.u.self_prot.action_code)))
2612 break;
2613
Thomas Pedersen8db09852011-08-12 20:01:00 -07002614 switch (mgmt->u.action.u.self_prot.action_code) {
2615 case WLAN_SP_MESH_PEERING_OPEN:
2616 case WLAN_SP_MESH_PEERING_CLOSE:
2617 case WLAN_SP_MESH_PEERING_CONFIRM:
2618 if (!ieee80211_vif_is_mesh(&sdata->vif))
2619 goto invalid;
Thomas Pedersena6dad6a2013-03-04 13:06:12 -08002620 if (sdata->u.mesh.user_mpm)
Thomas Pedersen8db09852011-08-12 20:01:00 -07002621 /* userspace handles this frame */
2622 break;
2623 goto queue;
2624 case WLAN_SP_MGK_INFORM:
2625 case WLAN_SP_MGK_ACK:
2626 if (!ieee80211_vif_is_mesh(&sdata->vif))
2627 goto invalid;
2628 break;
2629 }
2630 break;
Javier Cardonad3aaec8a2011-05-03 16:57:09 -07002631 case WLAN_CATEGORY_MESH_ACTION:
Johannes Berg9b395bc2012-10-26 00:36:40 +02002632 if (len < (IEEE80211_MIN_ACTION_SIZE +
2633 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2634 break;
2635
Johannes Berg77a121c2010-06-10 10:21:34 +02002636 if (!ieee80211_vif_is_mesh(&sdata->vif))
2637 break;
Thomas Pedersen25d49e42011-08-11 19:35:15 -07002638 if (mesh_action_is_path_sel(mgmt) &&
Johannes Berg1df332e2012-10-26 00:09:11 +02002639 !mesh_path_sel_is_hwmp(sdata))
Javier Cardonac7108a72010-12-16 17:37:50 -08002640 break;
2641 goto queue;
Johannes Berg84040802010-02-15 12:46:39 +02002642 }
Jouni Malinen026331c2010-02-15 12:53:10 +02002643
Johannes Berg2e161f72010-08-12 15:38:38 +02002644 return RX_CONTINUE;
2645
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002646 invalid:
Johannes Berg554891e2010-09-24 12:38:25 +02002647 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
Johannes Berg2e161f72010-08-12 15:38:38 +02002648 /* will return in the next handlers */
2649 return RX_CONTINUE;
2650
2651 handled:
2652 if (rx->sta)
2653 rx->sta->rx_packets++;
2654 dev_kfree_skb(rx->skb);
2655 return RX_QUEUED;
2656
2657 queue:
2658 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2659 skb_queue_tail(&sdata->skb_queue, rx->skb);
2660 ieee80211_queue_work(&local->hw, &sdata->work);
2661 if (rx->sta)
2662 rx->sta->rx_packets++;
2663 return RX_QUEUED;
2664}
2665
2666static ieee80211_rx_result debug_noinline
2667ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2668{
Johannes Berg554891e2010-09-24 12:38:25 +02002669 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg804483e2012-03-05 22:18:41 +01002670 int sig = 0;
Johannes Berg2e161f72010-08-12 15:38:38 +02002671
2672 /* skip known-bad action frames and return them in the next handler */
Johannes Berg554891e2010-09-24 12:38:25 +02002673 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
Johannes Berg2e161f72010-08-12 15:38:38 +02002674 return RX_CONTINUE;
Felix Fietkaud7907442010-01-07 20:23:53 +01002675
Jouni Malinen026331c2010-02-15 12:53:10 +02002676 /*
2677 * Getting here means the kernel doesn't know how to handle
2678 * it, but maybe userspace does ... include returned frames
2679 * so userspace can register for those to know whether ones
2680 * it transmitted were processed or returned.
2681 */
Jouni Malinen026331c2010-02-15 12:53:10 +02002682
Johannes Berg804483e2012-03-05 22:18:41 +01002683 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2684 sig = status->signal;
2685
Johannes Berg71bbc992012-06-15 15:30:18 +02002686 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
Johannes Berg2e161f72010-08-12 15:38:38 +02002687 rx->skb->data, rx->skb->len,
2688 GFP_ATOMIC)) {
2689 if (rx->sta)
2690 rx->sta->rx_packets++;
2691 dev_kfree_skb(rx->skb);
2692 return RX_QUEUED;
2693 }
2694
Johannes Berg2e161f72010-08-12 15:38:38 +02002695 return RX_CONTINUE;
2696}
2697
2698static ieee80211_rx_result debug_noinline
2699ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2700{
2701 struct ieee80211_local *local = rx->local;
2702 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2703 struct sk_buff *nskb;
2704 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02002705 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002706
2707 if (!ieee80211_is_action(mgmt->frame_control))
2708 return RX_CONTINUE;
2709
2710 /*
2711 * For AP mode, hostapd is responsible for handling any action
2712 * frames that we didn't handle, including returning unknown
2713 * ones. For all other modes we will return them to the sender,
2714 * setting the 0x80 bit in the action category, as required by
Johannes Berg4b5ebcc2012-06-27 15:38:56 +02002715 * 802.11-2012 9.24.4.
Johannes Berg2e161f72010-08-12 15:38:38 +02002716 * Newer versions of hostapd shall also use the management frame
2717 * registration mechanisms, but older ones still use cooked
2718 * monitor interfaces so push all frames there.
2719 */
Johannes Berg554891e2010-09-24 12:38:25 +02002720 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
Johannes Berg2e161f72010-08-12 15:38:38 +02002721 (sdata->vif.type == NL80211_IFTYPE_AP ||
2722 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2723 return RX_DROP_MONITOR;
Jouni Malinen026331c2010-02-15 12:53:10 +02002724
Johannes Berg4b5ebcc2012-06-27 15:38:56 +02002725 if (is_multicast_ether_addr(mgmt->da))
2726 return RX_DROP_MONITOR;
2727
Johannes Berg84040802010-02-15 12:46:39 +02002728 /* do not return rejected action frames */
2729 if (mgmt->u.action.category & 0x80)
2730 return RX_DROP_UNUSABLE;
2731
2732 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2733 GFP_ATOMIC);
2734 if (nskb) {
John W. Linville292b4df2010-06-24 11:13:56 -04002735 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
Johannes Berg84040802010-02-15 12:46:39 +02002736
John W. Linville292b4df2010-06-24 11:13:56 -04002737 nmgmt->u.action.category |= 0x80;
2738 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2739 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
Johannes Berg84040802010-02-15 12:46:39 +02002740
2741 memset(nskb->cb, 0, sizeof(nskb->cb));
2742
Johannes Berg07e5a5f2013-03-07 13:22:05 +01002743 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2744 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2745
2746 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2747 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2748 IEEE80211_TX_CTL_NO_CCK_RATE;
2749 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2750 info->hw_queue =
2751 local->hw.offchannel_tx_hw_queue;
2752 }
2753
2754 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2755 status->band);
Johannes Bergde1ede72008-09-09 14:42:50 +02002756 }
Johannes Berg39192c02008-09-09 14:49:03 +02002757 dev_kfree_skb(rx->skb);
2758 return RX_QUEUED;
Johannes Bergde1ede72008-09-09 14:42:50 +02002759}
2760
2761static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002762ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02002763{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002764 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg77a121c2010-06-10 10:21:34 +02002765 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2766 __le16 stype;
Johannes Berg571ecf62007-07-27 15:43:22 +02002767
Johannes Berg77a121c2010-06-10 10:21:34 +02002768 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
Johannes Berg472dbc42008-09-11 00:01:49 +02002769
Johannes Berg77a121c2010-06-10 10:21:34 +02002770 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2771 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2772 sdata->vif.type != NL80211_IFTYPE_STATION)
2773 return RX_DROP_MONITOR;
Johannes Bergf9d540e2007-09-28 14:02:09 +02002774
Johannes Berg77a121c2010-06-10 10:21:34 +02002775 switch (stype) {
Johannes Berg66e67e42012-01-20 13:55:27 +01002776 case cpu_to_le16(IEEE80211_STYPE_AUTH):
Johannes Berg77a121c2010-06-10 10:21:34 +02002777 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2778 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2779 /* process for all: mesh, mlme, ibss */
2780 break;
Johannes Berg66e67e42012-01-20 13:55:27 +01002781 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2782 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
Johannes Berg77a121c2010-06-10 10:21:34 +02002783 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2784 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
Christian Lamparter2c313332010-11-29 20:53:23 +01002785 if (is_multicast_ether_addr(mgmt->da) &&
2786 !is_broadcast_ether_addr(mgmt->da))
2787 return RX_DROP_MONITOR;
2788
Johannes Berg77a121c2010-06-10 10:21:34 +02002789 /* process only for station */
2790 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2791 return RX_DROP_MONITOR;
2792 break;
2793 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08002794 /* process only for ibss and mesh */
2795 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2796 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
Johannes Berg77a121c2010-06-10 10:21:34 +02002797 return RX_DROP_MONITOR;
2798 break;
2799 default:
2800 return RX_DROP_MONITOR;
2801 }
Johannes Berg46900292009-02-15 12:44:28 +01002802
Johannes Berg77a121c2010-06-10 10:21:34 +02002803 /* queue up frame and kick off work to process it */
Johannes Bergc1475ca2010-06-10 10:21:37 +02002804 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg77a121c2010-06-10 10:21:34 +02002805 skb_queue_tail(&sdata->skb_queue, rx->skb);
2806 ieee80211_queue_work(&rx->local->hw, &sdata->work);
Johannes Berg8b58ff82010-06-10 10:21:51 +02002807 if (rx->sta)
2808 rx->sta->rx_packets++;
Johannes Berg77a121c2010-06-10 10:21:34 +02002809
2810 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002811}
2812
Johannes Berg5cf121c2008-02-25 16:27:43 +01002813/* TODO: use IEEE80211_RX_FRAGMENTED */
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002814static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2815 struct ieee80211_rate *rate)
Michael Wu3d30d942008-01-31 19:48:27 +01002816{
2817 struct ieee80211_sub_if_data *sdata;
2818 struct ieee80211_local *local = rx->local;
Michael Wu3d30d942008-01-31 19:48:27 +01002819 struct sk_buff *skb = rx->skb, *skb2;
2820 struct net_device *prev_dev = NULL;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002821 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg293702a2012-03-02 13:18:19 +01002822 int needed_headroom;
Michael Wu3d30d942008-01-31 19:48:27 +01002823
Johannes Berg554891e2010-09-24 12:38:25 +02002824 /*
2825 * If cooked monitor has been processed already, then
2826 * don't do it again. If not, set the flag.
2827 */
2828 if (rx->flags & IEEE80211_RX_CMNTR)
John W. Linville7c1e1832010-09-24 15:52:49 -04002829 goto out_free_skb;
Johannes Berg554891e2010-09-24 12:38:25 +02002830 rx->flags |= IEEE80211_RX_CMNTR;
John W. Linville7c1e1832010-09-24 15:52:49 -04002831
Johannes Berg152c4772011-10-21 10:22:22 +02002832 /* If there are no cooked monitor interfaces, just free the SKB */
2833 if (!local->cooked_mntrs)
2834 goto out_free_skb;
2835
Johannes Berg293702a2012-03-02 13:18:19 +01002836 /* room for the radiotap header based on driver features */
Johannes Berg90b9e4462012-11-16 10:09:08 +01002837 needed_headroom = ieee80211_rx_radiotap_space(local, status);
Johannes Berg293702a2012-03-02 13:18:19 +01002838
2839 if (skb_headroom(skb) < needed_headroom &&
2840 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
Michael Wu3d30d942008-01-31 19:48:27 +01002841 goto out_free_skb;
2842
Johannes Berg293702a2012-03-02 13:18:19 +01002843 /* prepend radiotap information */
Felix Fietkau973ef212012-04-16 14:56:48 +02002844 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2845 false);
Michael Wu3d30d942008-01-31 19:48:27 +01002846
2847 skb_set_mac_header(skb, 0);
2848 skb->ip_summed = CHECKSUM_UNNECESSARY;
2849 skb->pkt_type = PACKET_OTHERHOST;
2850 skb->protocol = htons(ETH_P_802_2);
2851
2852 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01002853 if (!ieee80211_sdata_running(sdata))
Michael Wu3d30d942008-01-31 19:48:27 +01002854 continue;
2855
Johannes Berg05c914f2008-09-11 00:01:58 +02002856 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Michael Wu3d30d942008-01-31 19:48:27 +01002857 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2858 continue;
2859
2860 if (prev_dev) {
2861 skb2 = skb_clone(skb, GFP_ATOMIC);
2862 if (skb2) {
2863 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04002864 netif_receive_skb(skb2);
Michael Wu3d30d942008-01-31 19:48:27 +01002865 }
2866 }
2867
2868 prev_dev = sdata->dev;
2869 sdata->dev->stats.rx_packets++;
2870 sdata->dev->stats.rx_bytes += skb->len;
2871 }
2872
2873 if (prev_dev) {
2874 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04002875 netif_receive_skb(skb);
Johannes Berg554891e2010-09-24 12:38:25 +02002876 return;
2877 }
Michael Wu3d30d942008-01-31 19:48:27 +01002878
2879 out_free_skb:
2880 dev_kfree_skb(skb);
2881}
2882
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002883static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2884 ieee80211_rx_result res)
2885{
2886 switch (res) {
2887 case RX_DROP_MONITOR:
2888 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2889 if (rx->sta)
2890 rx->sta->rx_dropped++;
2891 /* fall through */
2892 case RX_CONTINUE: {
2893 struct ieee80211_rate *rate = NULL;
2894 struct ieee80211_supported_band *sband;
2895 struct ieee80211_rx_status *status;
2896
2897 status = IEEE80211_SKB_RXCB((rx->skb));
2898
2899 sband = rx->local->hw.wiphy->bands[status->band];
Johannes Berg56146182012-11-09 15:07:02 +01002900 if (!(status->flag & RX_FLAG_HT) &&
2901 !(status->flag & RX_FLAG_VHT))
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002902 rate = &sband->bitrates[status->rate_idx];
2903
2904 ieee80211_rx_cooked_monitor(rx, rate);
2905 break;
2906 }
2907 case RX_DROP_UNUSABLE:
2908 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2909 if (rx->sta)
2910 rx->sta->rx_dropped++;
2911 dev_kfree_skb(rx->skb);
2912 break;
2913 case RX_QUEUED:
2914 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2915 break;
2916 }
2917}
2918
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002919static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2920 struct sk_buff_head *frames)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002921{
2922 ieee80211_rx_result res = RX_DROP_MONITOR;
2923 struct sk_buff *skb;
2924
2925#define CALL_RXH(rxh) \
2926 do { \
2927 res = rxh(rx); \
2928 if (res != RX_CONTINUE) \
2929 goto rxh_next; \
2930 } while (0);
2931
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002932 spin_lock_bh(&rx->local->rx_path_lock);
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002933
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002934 while ((skb = __skb_dequeue(frames))) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002935 /*
2936 * all the other fields are valid across frames
2937 * that belong to an aMPDU since they are on the
2938 * same TID from the same station
2939 */
2940 rx->skb = skb;
2941
2942 CALL_RXH(ieee80211_rx_h_decrypt)
2943 CALL_RXH(ieee80211_rx_h_check_more_data)
Johannes Berg47086fc2011-09-29 16:04:33 +02002944 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002945 CALL_RXH(ieee80211_rx_h_sta_process)
2946 CALL_RXH(ieee80211_rx_h_defragment)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002947 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2948 /* must be after MMIC verify so header is counted in MPDU mic */
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002949#ifdef CONFIG_MAC80211_MESH
2950 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2951 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2952#endif
Javier Cardona2154c812011-09-07 17:49:53 -07002953 CALL_RXH(ieee80211_rx_h_amsdu)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002954 CALL_RXH(ieee80211_rx_h_data)
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002955
2956 /* special treatment -- needs the queue */
2957 res = ieee80211_rx_h_ctrl(rx, frames);
2958 if (res != RX_CONTINUE)
2959 goto rxh_next;
2960
Johannes Berg2e161f72010-08-12 15:38:38 +02002961 CALL_RXH(ieee80211_rx_h_mgmt_check)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002962 CALL_RXH(ieee80211_rx_h_action)
Johannes Berg2e161f72010-08-12 15:38:38 +02002963 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2964 CALL_RXH(ieee80211_rx_h_action_return)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002965 CALL_RXH(ieee80211_rx_h_mgmt)
2966
2967 rxh_next:
2968 ieee80211_rx_handlers_result(rx, res);
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002969
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002970#undef CALL_RXH
2971 }
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002972
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002973 spin_unlock_bh(&rx->local->rx_path_lock);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002974}
Johannes Berg571ecf62007-07-27 15:43:22 +02002975
Johannes Berg4406c372010-09-24 11:21:06 +02002976static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
Johannes Berg58905292008-01-31 19:48:25 +01002977{
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002978 struct sk_buff_head reorder_release;
Johannes Berg58905292008-01-31 19:48:25 +01002979 ieee80211_rx_result res = RX_DROP_MONITOR;
2980
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002981 __skb_queue_head_init(&reorder_release);
2982
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002983#define CALL_RXH(rxh) \
2984 do { \
2985 res = rxh(rx); \
2986 if (res != RX_CONTINUE) \
Johannes Berg2569a822009-11-25 17:46:17 +01002987 goto rxh_next; \
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002988 } while (0);
Johannes Berg58905292008-01-31 19:48:25 +01002989
Johannes Berg49461622008-06-30 15:10:45 +02002990 CALL_RXH(ieee80211_rx_h_check)
Johannes Berg2569a822009-11-25 17:46:17 +01002991
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002992 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
Johannes Berg2569a822009-11-25 17:46:17 +01002993
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002994 ieee80211_rx_handlers(rx, &reorder_release);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002995 return;
Johannes Berg49461622008-06-30 15:10:45 +02002996
Johannes Berg2569a822009-11-25 17:46:17 +01002997 rxh_next:
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002998 ieee80211_rx_handlers_result(rx, res);
2999
3000#undef CALL_RXH
Johannes Berg58905292008-01-31 19:48:25 +01003001}
3002
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003003/*
Johannes Bergdd318572010-11-29 11:09:16 +01003004 * This function makes calls into the RX path, therefore
3005 * it has to be invoked under RCU read lock.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003006 */
3007void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3008{
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003009 struct sk_buff_head frames;
Johannes Berg554891e2010-09-24 12:38:25 +02003010 struct ieee80211_rx_data rx = {
3011 .sta = sta,
3012 .sdata = sta->sdata,
3013 .local = sta->local,
Johannes Berg9e262972011-07-07 18:45:03 +02003014 /* This is OK -- must be QoS data frame */
3015 .security_idx = tid,
3016 .seqno_idx = tid,
Helmut Schaafcf8bd32011-04-01 15:46:05 +02003017 .flags = 0,
Johannes Berg554891e2010-09-24 12:38:25 +02003018 };
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003019 struct tid_ampdu_rx *tid_agg_rx;
3020
3021 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3022 if (!tid_agg_rx)
3023 return;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003024
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003025 __skb_queue_head_init(&frames);
3026
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003027 spin_lock(&tid_agg_rx->reorder_lock);
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003028 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003029 spin_unlock(&tid_agg_rx->reorder_lock);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003030
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003031 ieee80211_rx_handlers(&rx, &frames);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003032}
3033
Johannes Berg571ecf62007-07-27 15:43:22 +02003034/* main receive path */
3035
Johannes Berg20b01f82010-09-24 11:21:05 +02003036static int prepare_for_handlers(struct ieee80211_rx_data *rx,
Johannes Berg23a24de2007-07-27 15:43:22 +02003037 struct ieee80211_hdr *hdr)
3038{
Johannes Berg20b01f82010-09-24 11:21:05 +02003039 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003040 struct sk_buff *skb = rx->skb;
3041 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3042 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02003043 int multicast = is_multicast_ether_addr(hdr->addr1);
3044
Johannes Berg51fb61e2007-12-19 01:31:27 +01003045 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02003046 case NL80211_IFTYPE_STATION:
Johannes Berg9bc383d2009-11-19 11:55:19 +01003047 if (!bssid && !sdata->u.mgd.use_4addr)
Johannes Berg23a24de2007-07-27 15:43:22 +02003048 return 0;
Johannes Berg77fdaa12009-07-07 03:45:17 +02003049 if (!multicast &&
Joe Perchesb203ca32012-05-08 18:56:52 +00003050 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
Felix Fietkau4f312332011-02-05 23:48:37 +01003051 if (!(sdata->dev->flags & IFF_PROMISC) ||
3052 sdata->u.mgd.use_4addr)
Johannes Berg23a24de2007-07-27 15:43:22 +02003053 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02003054 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02003055 }
3056 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02003057 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02003058 if (!bssid)
3059 return 0;
Harvey Harrisona7767f92008-07-02 16:30:51 -07003060 if (ieee80211_is_beacon(hdr->frame_control)) {
Bruno Randolf9d9bf772008-02-18 11:21:36 +09003061 return 1;
Johannes Bergd48b2962012-07-06 22:19:27 +02003062 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3063 return 0;
Johannes Berg23a24de2007-07-27 15:43:22 +02003064 } else if (!multicast &&
Joe Perchesb203ca32012-05-08 18:56:52 +00003065 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
Johannes Berg4150c572007-09-17 01:29:23 -04003066 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02003067 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02003068 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003069 } else if (!rx->sta) {
3070 int rate_idx;
Johannes Berg56146182012-11-09 15:07:02 +01003071 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3072 rate_idx = 0; /* TODO: HT/VHT rates */
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003073 else
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003074 rate_idx = status->rate_idx;
Johannes Berg8bf11d82011-12-15 11:17:37 +01003075 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3076 BIT(rate_idx));
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003077 }
Johannes Berg23a24de2007-07-27 15:43:22 +02003078 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02003079 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg6032f932008-02-23 15:17:07 +01003080 if (!multicast &&
Joe Perchesb203ca32012-05-08 18:56:52 +00003081 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
Johannes Berg6032f932008-02-23 15:17:07 +01003082 if (!(sdata->dev->flags & IFF_PROMISC))
3083 return 0;
3084
Johannes Berg554891e2010-09-24 12:38:25 +02003085 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg6032f932008-02-23 15:17:07 +01003086 }
3087 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02003088 case NL80211_IFTYPE_AP_VLAN:
3089 case NL80211_IFTYPE_AP:
Johannes Berg23a24de2007-07-27 15:43:22 +02003090 if (!bssid) {
Joe Perchesb203ca32012-05-08 18:56:52 +00003091 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
Johannes Berg23a24de2007-07-27 15:43:22 +02003092 return 0;
Johannes Bergf142c6b2012-06-18 20:07:15 +02003093 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
Johannes Berg3df6eae2011-12-06 10:39:40 +01003094 /*
3095 * Accept public action frames even when the
3096 * BSSID doesn't match, this is used for P2P
3097 * and location updates. Note that mac80211
3098 * itself never looks at these frames.
3099 */
Johannes Berg2b9ccd42013-05-13 16:42:40 +02003100 if (!multicast &&
3101 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3102 return 0;
Johannes Bergd48b2962012-07-06 22:19:27 +02003103 if (ieee80211_is_public_action(hdr, skb->len))
Johannes Berg3df6eae2011-12-06 10:39:40 +01003104 return 1;
Johannes Bergd48b2962012-07-06 22:19:27 +02003105 if (!ieee80211_is_beacon(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02003106 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02003107 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02003108 }
Johannes Berg23a24de2007-07-27 15:43:22 +02003109 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02003110 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07003111 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02003112 return 0;
Joe Perchesb203ca32012-05-08 18:56:52 +00003113 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
Johannes Berg23a24de2007-07-27 15:43:22 +02003114 return 0;
3115 break;
Johannes Bergf142c6b2012-06-18 20:07:15 +02003116 case NL80211_IFTYPE_P2P_DEVICE:
3117 if (!ieee80211_is_public_action(hdr, skb->len) &&
3118 !ieee80211_is_probe_req(hdr->frame_control) &&
3119 !ieee80211_is_probe_resp(hdr->frame_control) &&
3120 !ieee80211_is_beacon(hdr->frame_control))
3121 return 0;
Johannes Berg1b737f82013-04-18 23:42:19 +02003122 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3123 !multicast)
Johannes Bergf142c6b2012-06-18 20:07:15 +02003124 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3125 break;
Johannes Berg2ca27bc2010-09-16 14:58:23 +02003126 default:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02003127 /* should never get here */
Johannes Bergf142c6b2012-06-18 20:07:15 +02003128 WARN_ON_ONCE(1);
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02003129 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02003130 }
3131
3132 return 1;
3133}
3134
Johannes Berg571ecf62007-07-27 15:43:22 +02003135/*
Johannes Berg4406c372010-09-24 11:21:06 +02003136 * This function returns whether or not the SKB
3137 * was destined for RX processing or not, which,
3138 * if consume is true, is equivalent to whether
3139 * or not the skb was consumed.
3140 */
3141static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3142 struct sk_buff *skb, bool consume)
3143{
3144 struct ieee80211_local *local = rx->local;
3145 struct ieee80211_sub_if_data *sdata = rx->sdata;
3146 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3147 struct ieee80211_hdr *hdr = (void *)skb->data;
3148 int prepares;
3149
3150 rx->skb = skb;
Johannes Berg554891e2010-09-24 12:38:25 +02003151 status->rx_flags |= IEEE80211_RX_RA_MATCH;
Johannes Berg4406c372010-09-24 11:21:06 +02003152 prepares = prepare_for_handlers(rx, hdr);
3153
3154 if (!prepares)
3155 return false;
3156
Johannes Berg4406c372010-09-24 11:21:06 +02003157 if (!consume) {
3158 skb = skb_copy(skb, GFP_ATOMIC);
3159 if (!skb) {
3160 if (net_ratelimit())
3161 wiphy_debug(local->hw.wiphy,
Ben Greearb305dae2011-01-08 10:30:54 -08003162 "failed to copy skb for %s\n",
Johannes Berg4406c372010-09-24 11:21:06 +02003163 sdata->name);
3164 return true;
3165 }
3166
3167 rx->skb = skb;
3168 }
3169
3170 ieee80211_invoke_rx_handlers(rx);
3171 return true;
3172}
3173
3174/*
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003175 * This is the actual Rx frames handler. as it blongs to Rx path it must
3176 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02003177 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02003178static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
Christian Lamparter071d9ac2010-08-05 01:36:36 +02003179 struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02003180{
3181 struct ieee80211_local *local = hw_to_local(hw);
3182 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02003183 struct ieee80211_hdr *hdr;
Zhu Yie3cf8b32010-03-29 17:35:07 +08003184 __le16 fc;
Johannes Berg5cf121c2008-02-25 16:27:43 +01003185 struct ieee80211_rx_data rx;
Johannes Berg4406c372010-09-24 11:21:06 +02003186 struct ieee80211_sub_if_data *prev;
Ben Greear56af3262010-09-23 10:22:24 -07003187 struct sta_info *sta, *tmp, *prev_sta;
Zhu Yie3cf8b32010-03-29 17:35:07 +08003188 int err = 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02003189
Zhu Yie3cf8b32010-03-29 17:35:07 +08003190 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02003191 memset(&rx, 0, sizeof(rx));
3192 rx.skb = skb;
3193 rx.local = local;
Johannes Berg72abd812007-09-17 01:29:22 -04003194
Zhu Yie3cf8b32010-03-29 17:35:07 +08003195 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
Johannes Berg571ecf62007-07-27 15:43:22 +02003196 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02003197
Johannes Berg4a4f1a52012-10-26 00:33:36 +02003198 if (ieee80211_is_mgmt(fc)) {
3199 /* drop frame if too short for header */
3200 if (skb->len < ieee80211_hdrlen(fc))
3201 err = -ENOBUFS;
3202 else
3203 err = skb_linearize(skb);
3204 } else {
Zhu Yie3cf8b32010-03-29 17:35:07 +08003205 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
Johannes Berg4a4f1a52012-10-26 00:33:36 +02003206 }
Zhu Yie3cf8b32010-03-29 17:35:07 +08003207
3208 if (err) {
3209 dev_kfree_skb(skb);
3210 return;
3211 }
3212
3213 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg38f37142008-01-29 17:07:43 +01003214 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01003215 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01003216
Johannes Bergd48b2962012-07-06 22:19:27 +02003217 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3218 ieee80211_is_beacon(hdr->frame_control)))
3219 ieee80211_scan_rx(local, skb);
3220
Zhu Yie3cf8b32010-03-29 17:35:07 +08003221 if (ieee80211_is_data(fc)) {
Ben Greear56af3262010-09-23 10:22:24 -07003222 prev_sta = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02003223
Johannes Berg7852e362012-01-20 13:55:24 +01003224 for_each_sta_info(local, hdr->addr2, sta, tmp) {
Ben Greear56af3262010-09-23 10:22:24 -07003225 if (!prev_sta) {
3226 prev_sta = sta;
3227 continue;
3228 }
3229
3230 rx.sta = prev_sta;
3231 rx.sdata = prev_sta->sdata;
Johannes Berg4406c372010-09-24 11:21:06 +02003232 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Johannes Berg571ecf62007-07-27 15:43:22 +02003233
Ben Greear56af3262010-09-23 10:22:24 -07003234 prev_sta = sta;
Johannes Berg4406c372010-09-24 11:21:06 +02003235 }
Ben Greear56af3262010-09-23 10:22:24 -07003236
3237 if (prev_sta) {
3238 rx.sta = prev_sta;
3239 rx.sdata = prev_sta->sdata;
3240
Johannes Berg4406c372010-09-24 11:21:06 +02003241 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
Ben Greear56af3262010-09-23 10:22:24 -07003242 return;
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05303243 goto out;
Ben Greear56af3262010-09-23 10:22:24 -07003244 }
Johannes Berg4406c372010-09-24 11:21:06 +02003245 }
3246
Johannes Berg4b0dd982010-09-24 11:21:07 +02003247 prev = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02003248
Johannes Berg4b0dd982010-09-24 11:21:07 +02003249 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3250 if (!ieee80211_sdata_running(sdata))
3251 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01003252
Johannes Berg4b0dd982010-09-24 11:21:07 +02003253 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3254 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3255 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01003256
Johannes Berg4b0dd982010-09-24 11:21:07 +02003257 /*
3258 * frame is destined for this interface, but if it's
3259 * not also for the previous one we handle that after
3260 * the loop to avoid copying the SKB once too much
3261 */
Johannes Bergb2e77712007-09-26 15:19:39 +02003262
Johannes Berg4b0dd982010-09-24 11:21:07 +02003263 if (!prev) {
Johannes Berg340e11f2007-07-27 15:43:22 +02003264 prev = sdata;
Johannes Berg4b0dd982010-09-24 11:21:07 +02003265 continue;
Johannes Berg8e6f00322007-07-27 15:43:22 +02003266 }
Felix Fietkau4bb29f82010-01-22 00:36:39 +01003267
Johannes Berg7852e362012-01-20 13:55:24 +01003268 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Johannes Berg4b0dd982010-09-24 11:21:07 +02003269 rx.sdata = prev;
3270 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01003271
Johannes Berg4b0dd982010-09-24 11:21:07 +02003272 prev = sdata;
3273 }
Johannes Berg4406c372010-09-24 11:21:06 +02003274
Johannes Berg4b0dd982010-09-24 11:21:07 +02003275 if (prev) {
Johannes Berg7852e362012-01-20 13:55:24 +01003276 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Johannes Berg4b0dd982010-09-24 11:21:07 +02003277 rx.sdata = prev;
3278
3279 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3280 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02003281 }
Johannes Berg4406c372010-09-24 11:21:06 +02003282
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05303283 out:
Johannes Berg4406c372010-09-24 11:21:06 +02003284 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02003285}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003286
3287/*
3288 * This is the receive path handler. It is called by a low level driver when an
3289 * 802.11 MPDU is received from the hardware.
3290 */
John W. Linville103bf9f2009-08-20 16:34:15 -04003291void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003292{
3293 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01003294 struct ieee80211_rate *rate = NULL;
3295 struct ieee80211_supported_band *sband;
Johannes Bergf1d58c22009-06-17 13:13:00 +02003296 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg8318d782008-01-24 19:38:38 +01003297
Johannes Bergd20ef632009-10-11 15:10:40 +02003298 WARN_ON_ONCE(softirq_count() == 0);
3299
Johannes Berg444e38032012-09-30 17:08:35 +02003300 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
Johannes Berg77a980d2009-08-24 11:46:30 +02003301 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01003302
3303 sband = local->hw.wiphy->bands[status->band];
Johannes Berg77a980d2009-08-24 11:46:30 +02003304 if (WARN_ON(!sband))
3305 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01003306
Johannes Berg89c3a8a2009-07-28 18:10:17 +02003307 /*
3308 * If we're suspending, it is possible although not too likely
3309 * that we'd be receiving frames after having already partially
3310 * quiesced the stack. We can't process such frames then since
3311 * that might, for example, cause stations to be added or other
3312 * driver callbacks be invoked.
3313 */
Johannes Berg77a980d2009-08-24 11:46:30 +02003314 if (unlikely(local->quiescing || local->suspended))
3315 goto drop;
Johannes Berg89c3a8a2009-07-28 18:10:17 +02003316
Arik Nemtsov04800ad2012-06-06 11:25:02 +03003317 /* We might be during a HW reconfig, prevent Rx for the same reason */
3318 if (unlikely(local->in_reconfig))
3319 goto drop;
3320
Johannes Bergea77f122009-08-21 14:44:45 +02003321 /*
3322 * The same happens when we're not even started,
3323 * but that's worth a warning.
3324 */
Johannes Berg77a980d2009-08-24 11:46:30 +02003325 if (WARN_ON(!local->started))
3326 goto drop;
Johannes Bergea77f122009-08-21 14:44:45 +02003327
Johannes Bergfc885182010-07-30 13:23:12 +02003328 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05003329 /*
Johannes Bergfc885182010-07-30 13:23:12 +02003330 * Validate the rate, unless a PLCP error means that
3331 * we probably can't have a valid rate here anyway.
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05003332 */
Johannes Bergfc885182010-07-30 13:23:12 +02003333
3334 if (status->flag & RX_FLAG_HT) {
3335 /*
3336 * rate_idx is MCS index, which can be [0-76]
3337 * as documented on:
3338 *
3339 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3340 *
3341 * Anything else would be some sort of driver or
3342 * hardware error. The driver should catch hardware
3343 * errors.
3344 */
Johannes Berg444e38032012-09-30 17:08:35 +02003345 if (WARN(status->rate_idx > 76,
Johannes Bergfc885182010-07-30 13:23:12 +02003346 "Rate marked as an HT rate but passed "
3347 "status->rate_idx is not "
3348 "an MCS index [0-76]: %d (0x%02x)\n",
3349 status->rate_idx,
3350 status->rate_idx))
3351 goto drop;
Johannes Berg56146182012-11-09 15:07:02 +01003352 } else if (status->flag & RX_FLAG_VHT) {
3353 if (WARN_ONCE(status->rate_idx > 9 ||
3354 !status->vht_nss ||
3355 status->vht_nss > 8,
3356 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3357 status->rate_idx, status->vht_nss))
3358 goto drop;
Johannes Bergfc885182010-07-30 13:23:12 +02003359 } else {
Johannes Berg444e38032012-09-30 17:08:35 +02003360 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
Johannes Bergfc885182010-07-30 13:23:12 +02003361 goto drop;
3362 rate = &sband->bitrates[status->rate_idx];
3363 }
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003364 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003365
Johannes Berg554891e2010-09-24 12:38:25 +02003366 status->rx_flags = 0;
3367
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003368 /*
3369 * key references and virtual interfaces are protected using RCU
3370 * and this requires that we are in a read-side RCU section during
3371 * receive processing
3372 */
3373 rcu_read_lock();
3374
3375 /*
3376 * Frames with failed FCS/PLCP checksum are not returned,
3377 * all other frames are returned without radiotap header
3378 * if it was previously present.
3379 * Also, frames with less than 16 bytes are dropped.
3380 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02003381 skb = ieee80211_rx_monitor(local, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003382 if (!skb) {
3383 rcu_read_unlock();
3384 return;
3385 }
3386
Johannes Berge1e54062010-11-30 08:58:45 +01003387 ieee80211_tpt_led_trig_rx(local,
3388 ((struct ieee80211_hdr *)skb->data)->frame_control,
3389 skb->len);
Christian Lamparter071d9ac2010-08-05 01:36:36 +02003390 __ieee80211_rx_handle_packet(hw, skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003391
3392 rcu_read_unlock();
Johannes Berg77a980d2009-08-24 11:46:30 +02003393
3394 return;
3395 drop:
3396 kfree_skb(skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003397}
John W. Linville103bf9f2009-08-20 16:34:15 -04003398EXPORT_SYMBOL(ieee80211_rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02003399
3400/* This is a version of the rx handler that can be called from hard irq
3401 * context. Post the skb on the queue and schedule the tasklet */
Johannes Bergf1d58c22009-06-17 13:13:00 +02003402void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02003403{
3404 struct ieee80211_local *local = hw_to_local(hw);
3405
3406 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3407
Johannes Berg571ecf62007-07-27 15:43:22 +02003408 skb->pkt_type = IEEE80211_RX_MSG;
3409 skb_queue_tail(&local->skb_queue, skb);
3410 tasklet_schedule(&local->tasklet);
3411}
3412EXPORT_SYMBOL(ieee80211_rx_irqsafe);