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Johannes Berg571ecf62007-07-27 15:43:22 +02001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
Johannes Berg84040802010-02-15 12:46:39 +02005 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
Johannes Bergd98ad832014-09-03 15:24:57 +03006 * Copyright 2013-2014 Intel Mobile Communications GmbH
Johannes Berg571ecf62007-07-27 15:43:22 +02007 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
S.Çağlar Onurab466232008-02-14 17:36:47 +020013#include <linux/jiffies.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/slab.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020015#include <linux/kernel.h>
16#include <linux/skbuff.h>
17#include <linux/netdevice.h>
18#include <linux/etherdevice.h>
Johannes Bergd4e46a32007-09-14 11:10:24 -040019#include <linux/rcupdate.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040020#include <linux/export.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020021#include <net/mac80211.h>
22#include <net/ieee80211_radiotap.h>
Johannes Bergd26ad372012-02-20 11:38:41 +010023#include <asm/unaligned.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020024
25#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020026#include "driver-ops.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040027#include "led.h"
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +010028#include "mesh.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020029#include "wep.h"
30#include "wpa.h"
31#include "tkip.h"
32#include "wme.h"
Johannes Berg1d8d3de2011-12-16 15:28:57 +010033#include "rate.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020034
Johannes Berg5a490512015-04-22 17:10:38 +020035static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
36{
37 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
38
39 u64_stats_update_begin(&tstats->syncp);
40 tstats->rx_packets++;
41 tstats->rx_bytes += len;
42 u64_stats_update_end(&tstats->syncp);
43}
44
Johannes Berga6828492015-06-16 15:17:15 +020045static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
46 enum nl80211_iftype type)
47{
48 __le16 fc = hdr->frame_control;
49
50 if (ieee80211_is_data(fc)) {
51 if (len < 24) /* drop incorrect hdr len (data) */
52 return NULL;
53
54 if (ieee80211_has_a4(fc))
55 return NULL;
56 if (ieee80211_has_tods(fc))
57 return hdr->addr1;
58 if (ieee80211_has_fromds(fc))
59 return hdr->addr2;
60
61 return hdr->addr3;
62 }
63
64 if (ieee80211_is_mgmt(fc)) {
65 if (len < 24) /* drop incorrect hdr len (mgmt) */
66 return NULL;
67 return hdr->addr3;
68 }
69
70 if (ieee80211_is_ctl(fc)) {
71 if (ieee80211_is_pspoll(fc))
72 return hdr->addr1;
73
74 if (ieee80211_is_back_req(fc)) {
75 switch (type) {
76 case NL80211_IFTYPE_STATION:
77 return hdr->addr2;
78 case NL80211_IFTYPE_AP:
79 case NL80211_IFTYPE_AP_VLAN:
80 return hdr->addr1;
81 default:
82 break; /* fall through to the return */
83 }
84 }
85 }
86
87 return NULL;
88}
89
Johannes Bergb2e77712007-09-26 15:19:39 +020090/*
91 * monitor mode reception
92 *
93 * This function cleans up the SKB, i.e. it removes all the stuff
94 * only useful for monitoring.
95 */
96static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
Johannes Berg1f7bba72014-11-06 22:56:36 +010097 struct sk_buff *skb,
98 unsigned int rtap_vendor_space)
Johannes Bergb2e77712007-09-26 15:19:39 +020099{
Johannes Berg30686bf2015-06-02 21:39:54 +0200100 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200101 if (likely(skb->len > FCS_LEN))
Zhu Yie3cf8b32010-03-29 17:35:07 +0800102 __pskb_trim(skb, skb->len - FCS_LEN);
Johannes Bergb2e77712007-09-26 15:19:39 +0200103 else {
104 /* driver bug */
105 WARN_ON(1);
106 dev_kfree_skb(skb);
Dan Carpenter06247602012-11-27 20:31:19 +0300107 return NULL;
Johannes Bergb2e77712007-09-26 15:19:39 +0200108 }
109 }
110
Johannes Berg1f7bba72014-11-06 22:56:36 +0100111 __pskb_pull(skb, rtap_vendor_space);
112
Johannes Bergb2e77712007-09-26 15:19:39 +0200113 return skb;
114}
115
Johannes Berg1f7bba72014-11-06 22:56:36 +0100116static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
117 unsigned int rtap_vendor_space)
Johannes Bergb2e77712007-09-26 15:19:39 +0200118{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200119 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg1f7bba72014-11-06 22:56:36 +0100120 struct ieee80211_hdr *hdr;
121
122 hdr = (void *)(skb->data + rtap_vendor_space);
Johannes Bergb2e77712007-09-26 15:19:39 +0200123
Johannes Berg4c298672012-07-05 11:34:31 +0200124 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
Johannes Berg0c028b52015-06-12 14:33:54 +0200125 RX_FLAG_FAILED_PLCP_CRC))
Zhao, Gang6b59db72014-04-21 12:52:59 +0800126 return true;
127
Johannes Berg1f7bba72014-11-06 22:56:36 +0100128 if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
Zhao, Gang6b59db72014-04-21 12:52:59 +0800129 return true;
130
Harvey Harrison87228f52008-06-11 14:21:59 -0700131 if (ieee80211_is_ctl(hdr->frame_control) &&
132 !ieee80211_is_pspoll(hdr->frame_control) &&
133 !ieee80211_is_back_req(hdr->frame_control))
Zhao, Gang6b59db72014-04-21 12:52:59 +0800134 return true;
135
136 return false;
Johannes Bergb2e77712007-09-26 15:19:39 +0200137}
138
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200139static int
Johannes Berg1f7bba72014-11-06 22:56:36 +0100140ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
141 struct ieee80211_rx_status *status,
142 struct sk_buff *skb)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200143{
144 int len;
145
146 /* always present fields */
Johannes Berga144f372013-07-03 13:34:02 +0200147 len = sizeof(struct ieee80211_radiotap_header) + 8;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200148
Johannes Berga144f372013-07-03 13:34:02 +0200149 /* allocate extra bitmaps */
Johannes Berga144f372013-07-03 13:34:02 +0200150 if (status->chains)
151 len += 4 * hweight8(status->chains);
Johannes Berg90b9e4462012-11-16 10:09:08 +0100152
153 if (ieee80211_have_rx_timestamp(status)) {
154 len = ALIGN(len, 8);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200155 len += 8;
Johannes Berg90b9e4462012-11-16 10:09:08 +0100156 }
Johannes Berg30686bf2015-06-02 21:39:54 +0200157 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200158 len += 1;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200159
Johannes Berga144f372013-07-03 13:34:02 +0200160 /* antenna field, if we don't have per-chain info */
161 if (!status->chains)
162 len += 1;
163
Johannes Berg90b9e4462012-11-16 10:09:08 +0100164 /* padding for RX_FLAGS if necessary */
165 len = ALIGN(len, 2);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200166
Johannes Berg6d744ba2011-01-27 14:13:17 +0100167 if (status->flag & RX_FLAG_HT) /* HT info */
168 len += 3;
169
Johannes Berg4c298672012-07-05 11:34:31 +0200170 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
Johannes Berg90b9e4462012-11-16 10:09:08 +0100171 len = ALIGN(len, 4);
Johannes Berg4c298672012-07-05 11:34:31 +0200172 len += 8;
173 }
174
Johannes Berg51648922012-11-22 23:00:18 +0100175 if (status->flag & RX_FLAG_VHT) {
176 len = ALIGN(len, 2);
177 len += 12;
178 }
179
Johannes Berga144f372013-07-03 13:34:02 +0200180 if (status->chains) {
181 /* antenna and antenna signal fields */
182 len += 2 * hweight8(status->chains);
183 }
184
Johannes Berg1f7bba72014-11-06 22:56:36 +0100185 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
186 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
187
188 /* vendor presence bitmap */
189 len += 4;
190 /* alignment for fixed 6-byte vendor data header */
191 len = ALIGN(len, 2);
192 /* vendor data header */
193 len += 6;
194 if (WARN_ON(rtap->align == 0))
195 rtap->align = 1;
196 len = ALIGN(len, rtap->align);
197 len += rtap->len + rtap->pad;
198 }
199
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200200 return len;
201}
202
Johannes Berg00ea6de2012-09-05 15:54:51 +0200203/*
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200204 * ieee80211_add_rx_radiotap_header - add radiotap header
205 *
206 * add a radiotap header containing all the fields which the hardware provided.
207 */
208static void
209ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
210 struct sk_buff *skb,
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200211 struct ieee80211_rate *rate,
Felix Fietkau973ef212012-04-16 14:56:48 +0200212 int rtap_len, bool has_fcs)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200213{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200214 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200215 struct ieee80211_radiotap_header *rthdr;
216 unsigned char *pos;
Johannes Berga144f372013-07-03 13:34:02 +0200217 __le32 *it_present;
218 u32 it_present_val;
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100219 u16 rx_flags = 0;
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200220 u16 channel_flags = 0;
Johannes Berga144f372013-07-03 13:34:02 +0200221 int mpdulen, chain;
222 unsigned long chains = status->chains;
Johannes Berg1f7bba72014-11-06 22:56:36 +0100223 struct ieee80211_vendor_radiotap rtap = {};
224
225 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
226 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
227 /* rtap.len and rtap.pad are undone immediately */
228 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
229 }
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800230
231 mpdulen = skb->len;
Johannes Berg30686bf2015-06-02 21:39:54 +0200232 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800233 mpdulen += FCS_LEN;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200234
235 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
Johannes Berg1f7bba72014-11-06 22:56:36 +0100236 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
Johannes Berga144f372013-07-03 13:34:02 +0200237 it_present = &rthdr->it_present;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200238
239 /* radiotap header, set always present flags */
Emmanuel Grumbach0059b2b2014-02-05 16:36:01 +0200240 rthdr->it_len = cpu_to_le16(rtap_len);
Johannes Berga144f372013-07-03 13:34:02 +0200241 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
242 BIT(IEEE80211_RADIOTAP_CHANNEL) |
243 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200244
Johannes Berga144f372013-07-03 13:34:02 +0200245 if (!status->chains)
246 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
247
248 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
249 it_present_val |=
250 BIT(IEEE80211_RADIOTAP_EXT) |
251 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
252 put_unaligned_le32(it_present_val, it_present);
253 it_present++;
254 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
255 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
256 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200257
Johannes Berg1f7bba72014-11-06 22:56:36 +0100258 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
259 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
260 BIT(IEEE80211_RADIOTAP_EXT);
261 put_unaligned_le32(it_present_val, it_present);
262 it_present++;
263 it_present_val = rtap.present;
264 }
265
Johannes Berga144f372013-07-03 13:34:02 +0200266 put_unaligned_le32(it_present_val, it_present);
267
268 pos = (void *)(it_present + 1);
269
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200270 /* the order of the following fields is important */
271
272 /* IEEE80211_RADIOTAP_TSFT */
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800273 if (ieee80211_have_rx_timestamp(status)) {
Johannes Berg90b9e4462012-11-16 10:09:08 +0100274 /* padding */
275 while ((pos - (u8 *)rthdr) & 7)
276 *pos++ = 0;
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800277 put_unaligned_le64(
278 ieee80211_calculate_rx_timestamp(local, status,
279 mpdulen, 0),
280 pos);
Johannes Berg1df332e2012-10-26 00:09:11 +0200281 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200282 pos += 8;
283 }
284
285 /* IEEE80211_RADIOTAP_FLAGS */
Johannes Berg30686bf2015-06-02 21:39:54 +0200286 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200287 *pos |= IEEE80211_RADIOTAP_F_FCS;
Johannes Bergaae89832009-03-13 12:52:10 +0100288 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
289 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
Bruno Randolfb4f28bb2008-07-30 17:19:55 +0200290 if (status->flag & RX_FLAG_SHORTPRE)
291 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200292 pos++;
293
294 /* IEEE80211_RADIOTAP_RATE */
Johannes Berg56146182012-11-09 15:07:02 +0100295 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200296 /*
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100297 * Without rate information don't add it. If we have,
Mohammed Shafi Shajakhan38f37be2011-02-07 10:10:04 +0530298 * MCS information is a separate field in radiotap,
Johannes Berg73b48092011-04-18 17:05:21 +0200299 * added below. The byte here is needed as padding
300 * for the channel though, so initialise it to 0.
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200301 */
302 *pos = 0;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200303 } else {
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200304 int shift = 0;
Jouni Malinenebe6c7b2009-01-10 11:47:33 +0200305 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200306 if (status->flag & RX_FLAG_10MHZ)
307 shift = 1;
308 else if (status->flag & RX_FLAG_5MHZ)
309 shift = 2;
310 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200311 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200312 pos++;
313
314 /* IEEE80211_RADIOTAP_CHANNEL */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100315 put_unaligned_le16(status->freq, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200316 pos += 2;
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200317 if (status->flag & RX_FLAG_10MHZ)
318 channel_flags |= IEEE80211_CHAN_HALF;
319 else if (status->flag & RX_FLAG_5MHZ)
320 channel_flags |= IEEE80211_CHAN_QUARTER;
321
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200322 if (status->band == IEEE80211_BAND_5GHZ)
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200323 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
Johannes Berg56146182012-11-09 15:07:02 +0100324 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200325 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100326 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200327 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100328 else if (rate)
Mathy Vanhoef3a5c5e82015-01-20 15:05:08 +0100329 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100330 else
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200331 channel_flags |= IEEE80211_CHAN_2GHZ;
332 put_unaligned_le16(channel_flags, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200333 pos += 2;
334
335 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
Johannes Berg30686bf2015-06-02 21:39:54 +0200336 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
Felix Fietkaufe8431f2012-03-01 18:00:07 +0100337 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200338 *pos = status->signal;
339 rthdr->it_present |=
340 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
341 pos++;
342 }
343
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200344 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
345
Johannes Berga144f372013-07-03 13:34:02 +0200346 if (!status->chains) {
347 /* IEEE80211_RADIOTAP_ANTENNA */
348 *pos = status->antenna;
349 pos++;
350 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200351
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200352 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
353
354 /* IEEE80211_RADIOTAP_RX_FLAGS */
355 /* ensure 2 byte alignment for the 2 byte field as required */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100356 if ((pos - (u8 *)rthdr) & 1)
Johannes Berg90b9e4462012-11-16 10:09:08 +0100357 *pos++ = 0;
Johannes Bergaae89832009-03-13 12:52:10 +0100358 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100359 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
360 put_unaligned_le16(rx_flags, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200361 pos += 2;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100362
363 if (status->flag & RX_FLAG_HT) {
Oleksij Rempel786677d2013-05-24 12:05:45 +0200364 unsigned int stbc;
365
Johannes Berg6d744ba2011-01-27 14:13:17 +0100366 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
Johannes Bergac55d2f2012-05-10 09:09:10 +0200367 *pos++ = local->hw.radiotap_mcs_details;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100368 *pos = 0;
369 if (status->flag & RX_FLAG_SHORT_GI)
370 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
371 if (status->flag & RX_FLAG_40MHZ)
372 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
Johannes Bergac55d2f2012-05-10 09:09:10 +0200373 if (status->flag & RX_FLAG_HT_GF)
374 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
Emmanuel Grumbach63c361f2014-02-05 12:48:53 +0200375 if (status->flag & RX_FLAG_LDPC)
376 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
Oleksij Rempel786677d2013-05-24 12:05:45 +0200377 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
378 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100379 pos++;
380 *pos++ = status->rate_idx;
381 }
Johannes Berg4c298672012-07-05 11:34:31 +0200382
383 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
384 u16 flags = 0;
385
386 /* ensure 4 byte alignment */
387 while ((pos - (u8 *)rthdr) & 3)
388 pos++;
389 rthdr->it_present |=
390 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
391 put_unaligned_le32(status->ampdu_reference, pos);
392 pos += 4;
Johannes Berg4c298672012-07-05 11:34:31 +0200393 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
394 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
395 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
396 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
397 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
398 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
399 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
400 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
401 put_unaligned_le16(flags, pos);
402 pos += 2;
403 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
404 *pos++ = status->ampdu_delimiter_crc;
405 else
406 *pos++ = 0;
407 *pos++ = 0;
408 }
Johannes Berg90b9e4462012-11-16 10:09:08 +0100409
Johannes Berg51648922012-11-22 23:00:18 +0100410 if (status->flag & RX_FLAG_VHT) {
411 u16 known = local->hw.radiotap_vht_details;
412
413 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
Johannes Berg51648922012-11-22 23:00:18 +0100414 put_unaligned_le16(known, pos);
415 pos += 2;
416 /* flags */
417 if (status->flag & RX_FLAG_SHORT_GI)
418 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
Emmanuel Grumbach63c361f2014-02-05 12:48:53 +0200419 /* in VHT, STBC is binary */
420 if (status->flag & RX_FLAG_STBC_MASK)
421 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
Emmanuel Grumbachfb378c22014-03-04 10:35:25 +0200422 if (status->vht_flag & RX_VHT_FLAG_BF)
423 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
Johannes Berg51648922012-11-22 23:00:18 +0100424 pos++;
425 /* bandwidth */
Emmanuel Grumbach1b8d2422014-02-05 16:37:11 +0200426 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
Johannes Berg51648922012-11-22 23:00:18 +0100427 *pos++ = 4;
Emmanuel Grumbach1b8d2422014-02-05 16:37:11 +0200428 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
Johannes Berg51648922012-11-22 23:00:18 +0100429 *pos++ = 11;
430 else if (status->flag & RX_FLAG_40MHZ)
431 *pos++ = 1;
432 else /* 20 MHz */
433 *pos++ = 0;
434 /* MCS/NSS */
435 *pos = (status->rate_idx << 4) | status->vht_nss;
436 pos += 4;
437 /* coding field */
Emmanuel Grumbach63c361f2014-02-05 12:48:53 +0200438 if (status->flag & RX_FLAG_LDPC)
439 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
Johannes Berg51648922012-11-22 23:00:18 +0100440 pos++;
441 /* group ID */
442 pos++;
443 /* partial_aid */
444 pos += 2;
445 }
446
Johannes Berga144f372013-07-03 13:34:02 +0200447 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
448 *pos++ = status->chain_signal[chain];
449 *pos++ = chain;
450 }
Johannes Berg1f7bba72014-11-06 22:56:36 +0100451
452 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
453 /* ensure 2 byte alignment for the vendor field as required */
454 if ((pos - (u8 *)rthdr) & 1)
455 *pos++ = 0;
456 *pos++ = rtap.oui[0];
457 *pos++ = rtap.oui[1];
458 *pos++ = rtap.oui[2];
459 *pos++ = rtap.subns;
460 put_unaligned_le16(rtap.len, pos);
461 pos += 2;
462 /* align the actual payload as requested */
463 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
464 *pos++ = 0;
465 /* data (and possible padding) already follows */
466 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200467}
468
Johannes Bergb2e77712007-09-26 15:19:39 +0200469/*
470 * This function copies a received frame to all monitor interfaces and
471 * returns a cleaned-up SKB that no longer includes the FCS nor the
472 * radiotap header the driver might have added.
473 */
474static struct sk_buff *
475ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
Johannes Berg8318d782008-01-24 19:38:38 +0100476 struct ieee80211_rate *rate)
Johannes Bergb2e77712007-09-26 15:19:39 +0200477{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200478 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200479 struct ieee80211_sub_if_data *sdata;
Johannes Berg1f7bba72014-11-06 22:56:36 +0100480 int rt_hdrlen, needed_headroom;
Johannes Bergb2e77712007-09-26 15:19:39 +0200481 struct sk_buff *skb, *skb2;
482 struct net_device *prev_dev = NULL;
483 int present_fcs_len = 0;
Johannes Berg1f7bba72014-11-06 22:56:36 +0100484 unsigned int rtap_vendor_space = 0;
485
486 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
487 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
488
489 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
490 }
Johannes Bergb2e77712007-09-26 15:19:39 +0200491
492 /*
493 * First, we may need to make a copy of the skb because
494 * (1) we need to modify it for radiotap (if not present), and
495 * (2) the other RX handlers will modify the skb we got.
496 *
497 * We don't need to, of course, if we aren't going to return
498 * the SKB because it has a bad FCS/PLCP checksum.
499 */
Johannes Berg0869aea2009-10-28 10:03:35 +0100500
Johannes Berg30686bf2015-06-02 21:39:54 +0200501 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
Johannes Bergb2e77712007-09-26 15:19:39 +0200502 present_fcs_len = FCS_LEN;
503
Johannes Berg1f7bba72014-11-06 22:56:36 +0100504 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
505 if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
Zhu Yie3cf8b32010-03-29 17:35:07 +0800506 dev_kfree_skb(origskb);
507 return NULL;
508 }
509
Johannes Bergb2e77712007-09-26 15:19:39 +0200510 if (!local->monitors) {
Johannes Berg1f7bba72014-11-06 22:56:36 +0100511 if (should_drop_frame(origskb, present_fcs_len,
512 rtap_vendor_space)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200513 dev_kfree_skb(origskb);
514 return NULL;
515 }
516
Johannes Berg1f7bba72014-11-06 22:56:36 +0100517 return remove_monitor_info(local, origskb, rtap_vendor_space);
Johannes Bergb2e77712007-09-26 15:19:39 +0200518 }
519
Helmut Schaa751413e2012-12-05 14:36:12 +0100520 /* room for the radiotap header based on driver features */
Johannes Berg1f7bba72014-11-06 22:56:36 +0100521 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
522 needed_headroom = rt_hdrlen - rtap_vendor_space;
Helmut Schaa751413e2012-12-05 14:36:12 +0100523
Johannes Berg1f7bba72014-11-06 22:56:36 +0100524 if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200525 /* only need to expand headroom if necessary */
526 skb = origskb;
527 origskb = NULL;
528
529 /*
530 * This shouldn't trigger often because most devices have an
531 * RX header they pull before we get here, and that should
532 * be big enough for our radiotap information. We should
533 * probably export the length to drivers so that we can have
534 * them allocate enough headroom to start with.
535 */
536 if (skb_headroom(skb) < needed_headroom &&
Johannes Bergc49e5ea2007-12-11 21:33:42 +0100537 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200538 dev_kfree_skb(skb);
539 return NULL;
540 }
541 } else {
542 /*
543 * Need to make a copy and possibly remove radiotap header
544 * and FCS from the original.
545 */
546 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
547
Johannes Berg1f7bba72014-11-06 22:56:36 +0100548 origskb = remove_monitor_info(local, origskb,
549 rtap_vendor_space);
Johannes Bergb2e77712007-09-26 15:19:39 +0200550
551 if (!skb)
552 return origskb;
553 }
554
Johannes Berg0869aea2009-10-28 10:03:35 +0100555 /* prepend radiotap information */
Johannes Berg1f7bba72014-11-06 22:56:36 +0100556 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
Johannes Bergb2e77712007-09-26 15:19:39 +0200557
Johannes Bergce3edf6d02007-12-19 01:31:22 +0100558 skb_reset_mac_header(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200559 skb->ip_summed = CHECKSUM_UNNECESSARY;
560 skb->pkt_type = PACKET_OTHERHOST;
561 skb->protocol = htons(ETH_P_802_2);
562
563 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200564 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +0200565 continue;
566
Michael Wu3d30d942008-01-31 19:48:27 +0100567 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
568 continue;
569
Johannes Berg9607e6b2009-12-23 13:15:31 +0100570 if (!ieee80211_sdata_running(sdata))
Johannes Berg47846c92009-11-25 17:46:19 +0100571 continue;
572
Johannes Bergb2e77712007-09-26 15:19:39 +0200573 if (prev_dev) {
574 skb2 = skb_clone(skb, GFP_ATOMIC);
575 if (skb2) {
576 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400577 netif_receive_skb(skb2);
Johannes Bergb2e77712007-09-26 15:19:39 +0200578 }
579 }
580
581 prev_dev = sdata->dev;
Johannes Berg5a490512015-04-22 17:10:38 +0200582 ieee80211_rx_stats(sdata->dev, skb->len);
Johannes Bergb2e77712007-09-26 15:19:39 +0200583 }
584
585 if (prev_dev) {
586 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400587 netif_receive_skb(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200588 } else
589 dev_kfree_skb(skb);
590
591 return origskb;
592}
593
Johannes Berg5cf121c2008-02-25 16:27:43 +0100594static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200595{
Harvey Harrison238f74a2008-07-02 11:05:34 -0700596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +0200597 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg9e262972011-07-07 18:45:03 +0200598 int tid, seqno_idx, security_idx;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200599
600 /* does the frame have a qos control field? */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700601 if (ieee80211_is_data_qos(hdr->frame_control)) {
602 u8 *qc = ieee80211_get_qos_ctl(hdr);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200603 /* frame has qos control */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700604 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
Johannes Berg04b7dcf2011-06-22 10:06:59 +0200605 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
Johannes Berg554891e2010-09-24 12:38:25 +0200606 status->rx_flags |= IEEE80211_RX_AMSDU;
Johannes Berg9e262972011-07-07 18:45:03 +0200607
608 seqno_idx = tid;
609 security_idx = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200610 } else {
Johannes Berg1411f9b2008-07-10 10:11:02 +0200611 /*
612 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
613 *
614 * Sequence numbers for management frames, QoS data
615 * frames with a broadcast/multicast address in the
616 * Address 1 field, and all non-QoS data frames sent
617 * by QoS STAs are assigned using an additional single
618 * modulo-4096 counter, [...]
619 *
620 * We also use that counter for non-QoS STAs.
621 */
Johannes Berg5a306f52012-11-14 23:22:21 +0100622 seqno_idx = IEEE80211_NUM_TIDS;
Johannes Berg9e262972011-07-07 18:45:03 +0200623 security_idx = 0;
624 if (ieee80211_is_mgmt(hdr->frame_control))
Johannes Berg5a306f52012-11-14 23:22:21 +0100625 security_idx = IEEE80211_NUM_TIDS;
Johannes Berg9e262972011-07-07 18:45:03 +0200626 tid = 0;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200627 }
Johannes Berg52865dfd2007-07-27 15:43:22 +0200628
Johannes Berg9e262972011-07-07 18:45:03 +0200629 rx->seqno_idx = seqno_idx;
630 rx->security_idx = security_idx;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200631 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
632 * For now, set skb->priority to 0 for other cases. */
633 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100634}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200635
Johannes Bergd1c3a372009-01-07 00:26:10 +0100636/**
637 * DOC: Packet alignment
638 *
639 * Drivers always need to pass packets that are aligned to two-byte boundaries
640 * to the stack.
641 *
642 * Additionally, should, if possible, align the payload data in a way that
643 * guarantees that the contained IP header is aligned to a four-byte
644 * boundary. In the case of regular frames, this simply means aligning the
645 * payload to a four-byte boundary (because either the IP header is directly
646 * contained, or IV/RFC1042 headers that have a length divisible by four are
Kalle Valo59d9cb02009-12-17 13:54:57 +0100647 * in front of it). If the payload data is not properly aligned and the
648 * architecture doesn't support efficient unaligned operations, mac80211
649 * will align the data.
Johannes Bergd1c3a372009-01-07 00:26:10 +0100650 *
651 * With A-MSDU frames, however, the payload data address must yield two modulo
652 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
653 * push the IP header further back to a multiple of four again. Thankfully, the
654 * specs were sane enough this time around to require padding each A-MSDU
655 * subframe to a length that is a multiple of four.
656 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300657 * Padding like Atheros hardware adds which is between the 802.11 header and
Johannes Bergd1c3a372009-01-07 00:26:10 +0100658 * the payload is not supported, the driver is required to move the 802.11
659 * header to be directly in front of the payload in that case.
660 */
661static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
Johannes Berg38f37142008-01-29 17:07:43 +0100662{
Kalle Valo59d9cb02009-12-17 13:54:57 +0100663#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
664 WARN_ONCE((unsigned long)rx->skb->data & 1,
665 "unaligned packet at 0x%p\n", rx->skb->data);
Johannes Bergd1c3a372009-01-07 00:26:10 +0100666#endif
Johannes Berg6e0d1142007-07-27 15:43:22 +0200667}
668
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +0200669
Johannes Berg571ecf62007-07-27 15:43:22 +0200670/* rx handlers */
671
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200672static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
673{
674 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
675
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100676 if (is_multicast_ether_addr(hdr->addr1))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200677 return 0;
678
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100679 return ieee80211_is_robust_mgmt_frame(skb);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200680}
681
682
683static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
684{
685 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
686
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100687 if (!is_multicast_ether_addr(hdr->addr1))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200688 return 0;
689
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100690 return ieee80211_is_robust_mgmt_frame(skb);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200691}
692
693
694/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
695static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
696{
697 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
698 struct ieee80211_mmie *mmie;
Jouni Malinen56c52da2015-01-24 19:52:08 +0200699 struct ieee80211_mmie_16 *mmie16;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200700
Johannes Berg1df332e2012-10-26 00:09:11 +0200701 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200702 return -1;
703
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100704 if (!ieee80211_is_robust_mgmt_frame(skb))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200705 return -1; /* not a robust management frame */
706
707 mmie = (struct ieee80211_mmie *)
708 (skb->data + skb->len - sizeof(*mmie));
Jouni Malinen56c52da2015-01-24 19:52:08 +0200709 if (mmie->element_id == WLAN_EID_MMIE &&
710 mmie->length == sizeof(*mmie) - 2)
711 return le16_to_cpu(mmie->key_id);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200712
Jouni Malinen56c52da2015-01-24 19:52:08 +0200713 mmie16 = (struct ieee80211_mmie_16 *)
714 (skb->data + skb->len - sizeof(*mmie16));
715 if (skb->len >= 24 + sizeof(*mmie16) &&
716 mmie16->element_id == WLAN_EID_MMIE &&
717 mmie16->length == sizeof(*mmie16) - 2)
718 return le16_to_cpu(mmie16->key_id);
719
720 return -1;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200721}
722
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200723static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
724 struct sk_buff *skb)
725{
726 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
727 __le16 fc;
728 int hdrlen;
729 u8 keyid;
730
731 fc = hdr->frame_control;
732 hdrlen = ieee80211_hdrlen(fc);
733
734 if (skb->len < hdrlen + cs->hdr_len)
735 return -EINVAL;
736
737 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
738 keyid &= cs->key_idx_mask;
739 keyid >>= cs->key_idx_shift;
740
741 return keyid;
742}
743
Johannes Berg1df332e2012-10-26 00:09:11 +0200744static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100745{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700746 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg47846c92009-11-25 17:46:19 +0100747 char *dev_addr = rx->sdata->vif.addr;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100748
Harvey Harrisona7767f92008-07-02 16:30:51 -0700749 if (ieee80211_is_data(hdr->frame_control)) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700750 if (is_multicast_ether_addr(hdr->addr1)) {
751 if (ieee80211_has_tods(hdr->frame_control) ||
Johannes Berg1df332e2012-10-26 00:09:11 +0200752 !ieee80211_has_fromds(hdr->frame_control))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700753 return RX_DROP_MONITOR;
Joe Perchesb203ca32012-05-08 18:56:52 +0000754 if (ether_addr_equal(hdr->addr3, dev_addr))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700755 return RX_DROP_MONITOR;
756 } else {
757 if (!ieee80211_has_a4(hdr->frame_control))
758 return RX_DROP_MONITOR;
Joe Perchesb203ca32012-05-08 18:56:52 +0000759 if (ether_addr_equal(hdr->addr4, dev_addr))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700760 return RX_DROP_MONITOR;
761 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100762 }
763
764 /* If there is not an established peer link and this is not a peer link
765 * establisment frame, beacon or probe, drop the frame.
766 */
767
Javier Cardona57cf8042011-05-13 10:45:43 -0700768 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100769 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100770
Harvey Harrisona7767f92008-07-02 16:30:51 -0700771 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100772 return RX_DROP_MONITOR;
773
Harvey Harrisona7767f92008-07-02 16:30:51 -0700774 if (ieee80211_is_action(hdr->frame_control)) {
Javier Cardonad3aaec8a2011-05-03 16:57:09 -0700775 u8 category;
Johannes Berg9b395bc2012-10-26 00:36:40 +0200776
777 /* make sure category field is present */
778 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
779 return RX_DROP_MONITOR;
780
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100781 mgmt = (struct ieee80211_mgmt *)hdr;
Javier Cardonad3aaec8a2011-05-03 16:57:09 -0700782 category = mgmt->u.action.category;
783 if (category != WLAN_CATEGORY_MESH_ACTION &&
Johannes Berg1df332e2012-10-26 00:09:11 +0200784 category != WLAN_CATEGORY_SELF_PROTECTED)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100785 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100786 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100787 }
788
Harvey Harrisona7767f92008-07-02 16:30:51 -0700789 if (ieee80211_is_probe_req(hdr->frame_control) ||
790 ieee80211_is_probe_resp(hdr->frame_control) ||
Javier Cardona71839122011-04-07 15:08:31 -0700791 ieee80211_is_beacon(hdr->frame_control) ||
792 ieee80211_is_auth(hdr->frame_control))
Harvey Harrisona7767f92008-07-02 16:30:51 -0700793 return RX_CONTINUE;
794
795 return RX_DROP_MONITOR;
Harvey Harrisona7767f92008-07-02 16:30:51 -0700796 }
797
Johannes Berg902acc72008-02-23 15:17:19 +0100798 return RX_CONTINUE;
799}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100800
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200801static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100802 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000803 int index,
804 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100805{
Michal Kazior83eb9352014-07-16 12:09:31 +0200806 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
807 struct sk_buff *skb;
Christian Lamparter4cfda472010-12-27 23:21:26 +0100808 struct ieee80211_rx_status *status;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100809
Johannes Bergdd318572010-11-29 11:09:16 +0100810 lockdep_assert_held(&tid_agg_rx->reorder_lock);
811
Michal Kazior83eb9352014-07-16 12:09:31 +0200812 if (skb_queue_empty(skb_list))
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100813 goto no_frame;
814
Michal Kazior83eb9352014-07-16 12:09:31 +0200815 if (!ieee80211_rx_reorder_ready(skb_list)) {
816 __skb_queue_purge(skb_list);
817 goto no_frame;
818 }
819
820 /* release frames from the reorder ring buffer */
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100821 tid_agg_rx->stored_mpdu_num--;
Michal Kazior83eb9352014-07-16 12:09:31 +0200822 while ((skb = __skb_dequeue(skb_list))) {
823 status = IEEE80211_SKB_RXCB(skb);
824 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
825 __skb_queue_tail(frames, skb);
826 }
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100827
828no_frame:
Johannes Berg9a886582013-02-15 19:25:00 +0100829 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100830}
831
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200832static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100833 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000834 u16 head_seq_num,
835 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100836{
837 int index;
838
Johannes Bergdd318572010-11-29 11:09:16 +0100839 lockdep_assert_held(&tid_agg_rx->reorder_lock);
840
Johannes Berg9a886582013-02-15 19:25:00 +0100841 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
Karl Beldan2e3049b2013-10-24 15:53:32 +0200842 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000843 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
844 frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100845 }
846}
847
848/*
849 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
850 * the skb was added to the buffer longer than this time ago, the earlier
851 * frames that have not yet been received are assumed to be lost and the skb
852 * can be released for processing. This may also release other skb's from the
853 * reorder buffer if there are no additional gaps between the frames.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200854 *
855 * Callers must hold tid_agg_rx->reorder_lock.
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100856 */
857#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
858
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200859static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000860 struct tid_ampdu_rx *tid_agg_rx,
861 struct sk_buff_head *frames)
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200862{
Michal Kazior83eb9352014-07-16 12:09:31 +0200863 int index, i, j;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200864
Johannes Bergdd318572010-11-29 11:09:16 +0100865 lockdep_assert_held(&tid_agg_rx->reorder_lock);
866
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200867 /* release the buffer until next missing frame */
Karl Beldan2e3049b2013-10-24 15:53:32 +0200868 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Michal Kazior83eb9352014-07-16 12:09:31 +0200869 if (!ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index]) &&
Eliad Peller07ae2df2012-02-01 18:48:09 +0200870 tid_agg_rx->stored_mpdu_num) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200871 /*
872 * No buffers ready to be released, but check whether any
873 * frames in the reorder buffer have timed out.
874 */
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200875 int skipped = 1;
876 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
877 j = (j + 1) % tid_agg_rx->buf_size) {
Michal Kazior83eb9352014-07-16 12:09:31 +0200878 if (!ieee80211_rx_reorder_ready(
879 &tid_agg_rx->reorder_buf[j])) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200880 skipped++;
881 continue;
882 }
Daniel Halperin499fe9a2011-03-24 16:01:48 -0700883 if (skipped &&
884 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200885 HT_RX_REORDER_BUF_TIMEOUT))
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200886 goto set_release_timer;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200887
Michal Kazior83eb9352014-07-16 12:09:31 +0200888 /* don't leave incomplete A-MSDUs around */
889 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
890 i = (i + 1) % tid_agg_rx->buf_size)
891 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
892
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200893 ht_dbg_ratelimited(sdata,
894 "release an RX reorder frame due to timeout on earlier frames\n");
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000895 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
896 frames);
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200897
898 /*
899 * Increment the head seq# also for the skipped slots.
900 */
901 tid_agg_rx->head_seq_num =
Johannes Berg9a886582013-02-15 19:25:00 +0100902 (tid_agg_rx->head_seq_num +
903 skipped) & IEEE80211_SN_MASK;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200904 skipped = 0;
905 }
Michal Kazior83eb9352014-07-16 12:09:31 +0200906 } else while (ieee80211_rx_reorder_ready(
907 &tid_agg_rx->reorder_buf[index])) {
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000908 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
909 frames);
Karl Beldan2e3049b2013-10-24 15:53:32 +0200910 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200911 }
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200912
913 if (tid_agg_rx->stored_mpdu_num) {
Karl Beldan2e3049b2013-10-24 15:53:32 +0200914 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200915
916 for (; j != (index - 1) % tid_agg_rx->buf_size;
917 j = (j + 1) % tid_agg_rx->buf_size) {
Michal Kazior83eb9352014-07-16 12:09:31 +0200918 if (ieee80211_rx_reorder_ready(
919 &tid_agg_rx->reorder_buf[j]))
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200920 break;
921 }
922
923 set_release_timer:
924
Johannes Berg788211d2015-04-01 14:20:42 +0200925 if (!tid_agg_rx->removed)
926 mod_timer(&tid_agg_rx->reorder_timer,
927 tid_agg_rx->reorder_time[j] + 1 +
928 HT_RX_REORDER_BUF_TIMEOUT);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200929 } else {
930 del_timer(&tid_agg_rx->reorder_timer);
931 }
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200932}
933
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100934/*
935 * As this function belongs to the RX path it must be under
936 * rcu_read_lock protection. It returns false if the frame
937 * can be processed immediately, true if it was consumed.
938 */
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200939static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100940 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000941 struct sk_buff *skb,
942 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100943{
944 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Michal Kazior83eb9352014-07-16 12:09:31 +0200945 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100946 u16 sc = le16_to_cpu(hdr->seq_ctrl);
947 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
948 u16 head_seq_num, buf_size;
949 int index;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200950 bool ret = true;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100951
Johannes Bergdd318572010-11-29 11:09:16 +0100952 spin_lock(&tid_agg_rx->reorder_lock);
953
Michal Kazior4549cf22014-09-02 14:05:10 +0200954 /*
955 * Offloaded BA sessions have no known starting sequence number so pick
956 * one from first Rxed frame for this tid after BA was started.
957 */
958 if (unlikely(tid_agg_rx->auto_seq)) {
959 tid_agg_rx->auto_seq = false;
960 tid_agg_rx->ssn = mpdu_seq_num;
961 tid_agg_rx->head_seq_num = mpdu_seq_num;
962 }
963
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100964 buf_size = tid_agg_rx->buf_size;
965 head_seq_num = tid_agg_rx->head_seq_num;
966
967 /* frame with out of date sequence number */
Johannes Berg9a886582013-02-15 19:25:00 +0100968 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100969 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200970 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100971 }
972
973 /*
974 * If frame the sequence number exceeds our buffering window
975 * size release some previous frames to make room for this one.
976 */
Johannes Berg9a886582013-02-15 19:25:00 +0100977 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
978 head_seq_num = ieee80211_sn_inc(
979 ieee80211_sn_sub(mpdu_seq_num, buf_size));
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100980 /* release stored frames up to new head to stack */
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200981 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000982 head_seq_num, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100983 }
984
985 /* Now the new frame is always in the range of the reordering buffer */
986
Karl Beldan2e3049b2013-10-24 15:53:32 +0200987 index = mpdu_seq_num % tid_agg_rx->buf_size;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100988
989 /* check if we already stored this frame */
Michal Kazior83eb9352014-07-16 12:09:31 +0200990 if (ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index])) {
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100991 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200992 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100993 }
994
995 /*
996 * If the current MPDU is in the right order and nothing else
997 * is stored we can process it directly, no need to buffer it.
Johannes Bergc835b212011-03-15 23:17:01 +0100998 * If it is first but there's something stored, we may be able
999 * to release frames after this one.
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001000 */
1001 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1002 tid_agg_rx->stored_mpdu_num == 0) {
Michal Kazior83eb9352014-07-16 12:09:31 +02001003 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1004 tid_agg_rx->head_seq_num =
1005 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001006 ret = false;
1007 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001008 }
1009
1010 /* put the frame in the reordering buffer */
Michal Kazior83eb9352014-07-16 12:09:31 +02001011 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1012 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1013 tid_agg_rx->reorder_time[index] = jiffies;
1014 tid_agg_rx->stored_mpdu_num++;
1015 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1016 }
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001017
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001018 out:
1019 spin_unlock(&tid_agg_rx->reorder_lock);
1020 return ret;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001021}
1022
1023/*
1024 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1025 * true if the MPDU was buffered, false if it should be processed.
1026 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +00001027static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1028 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001029{
Johannes Berg2569a822009-11-25 17:46:17 +01001030 struct sk_buff *skb = rx->skb;
1031 struct ieee80211_local *local = rx->local;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001032 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Johannes Berg2569a822009-11-25 17:46:17 +01001033 struct sta_info *sta = rx->sta;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001034 struct tid_ampdu_rx *tid_agg_rx;
1035 u16 sc;
Thomas Pedersen6cc00d52011-11-03 21:11:11 -07001036 u8 tid, ack_policy;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001037
Johannes Berg051a41f2013-11-20 11:28:27 +01001038 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1039 is_multicast_ether_addr(hdr->addr1))
Johannes Berg2569a822009-11-25 17:46:17 +01001040 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001041
1042 /*
1043 * filter the QoS data rx stream according to
1044 * STA/TID and check if this STA/TID is on aggregation
1045 */
1046
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001047 if (!sta)
Johannes Berg2569a822009-11-25 17:46:17 +01001048 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001049
Thomas Pedersen6cc00d52011-11-03 21:11:11 -07001050 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1051 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001052 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1053
Johannes Berga87f7362010-06-10 10:21:38 +02001054 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1055 if (!tid_agg_rx)
1056 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001057
1058 /* qos null data frames are excluded */
1059 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Johannes Berga87f7362010-06-10 10:21:38 +02001060 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001061
Thomas Pedersen6cc00d52011-11-03 21:11:11 -07001062 /* not part of a BA session */
1063 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1064 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1065 goto dont_reorder;
1066
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001067 /* new, potentially un-ordered, ampdu frame - process it */
1068
1069 /* reset session timer */
1070 if (tid_agg_rx->timeout)
Felix Fietkau12d3952f2012-03-18 22:58:06 +01001071 tid_agg_rx->last_rx = jiffies;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001072
1073 /* if this mpdu is fragmented - terminate rx aggregation session */
1074 sc = le16_to_cpu(hdr->seq_ctrl);
1075 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Bergc1475ca2010-06-10 10:21:37 +02001076 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg344eec62010-06-10 10:21:36 +02001077 skb_queue_tail(&rx->sdata->skb_queue, skb);
1078 ieee80211_queue_work(&local->hw, &rx->sdata->work);
Johannes Berg2569a822009-11-25 17:46:17 +01001079 return;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001080 }
1081
Johannes Berga87f7362010-06-10 10:21:38 +02001082 /*
1083 * No locking needed -- we will only ever process one
1084 * RX packet at a time, and thus own tid_agg_rx. All
1085 * other code manipulating it needs to (and does) make
1086 * sure that we cannot get to it any more before doing
1087 * anything with it.
1088 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +00001089 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1090 frames))
Johannes Berg2569a822009-11-25 17:46:17 +01001091 return;
1092
1093 dont_reorder:
Christian Lamparterf9e124f2013-02-04 17:44:44 +00001094 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001095}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001096
Johannes Berg49461622008-06-30 15:10:45 +02001097static ieee80211_rx_result debug_noinline
Johannes Berg03954422014-11-11 16:49:25 +01001098ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001099{
Harvey Harrisona7767f92008-07-02 16:30:51 -07001100 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02001101 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001102
Johannes Berg6b0f3272013-07-11 22:33:26 +02001103 /*
1104 * Drop duplicate 802.11 retransmissions
1105 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1106 */
Johannes Berg03954422014-11-11 16:49:25 +01001107
1108 if (rx->skb->len < 24)
1109 return RX_CONTINUE;
1110
1111 if (ieee80211_is_ctl(hdr->frame_control) ||
1112 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1113 is_multicast_ether_addr(hdr->addr1))
1114 return RX_CONTINUE;
1115
1116 if (rx->sta) {
Harvey Harrisona7767f92008-07-02 16:30:51 -07001117 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
Johannes Berg9e262972011-07-07 18:45:03 +02001118 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
Johannes Berg571ecf62007-07-27 15:43:22 +02001119 hdr->seq_ctrl)) {
Johannes Bergc206ca62015-04-22 20:47:28 +02001120 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
Johannes Berg5c900672015-04-22 14:48:34 +02001121 rx->sta->num_duplicates++;
Felix Fietkaub1f93312011-02-04 19:20:08 +01001122 return RX_DROP_UNUSABLE;
Michal Kazior0cfcefe2013-09-23 15:34:38 +02001123 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
Johannes Berg9e262972011-07-07 18:45:03 +02001124 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
Michal Kazior0cfcefe2013-09-23 15:34:38 +02001125 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001126 }
1127
Johannes Berg03954422014-11-11 16:49:25 +01001128 return RX_CONTINUE;
1129}
1130
1131static ieee80211_rx_result debug_noinline
1132ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1133{
1134 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1135
Johannes Berg571ecf62007-07-27 15:43:22 +02001136 /* Drop disallowed frame classes based on STA auth/assoc state;
1137 * IEEE 802.11, Chap 5.5.
1138 *
Johannes Bergccd7b362008-09-11 00:01:56 +02001139 * mac80211 filters only based on association state, i.e. it drops
1140 * Class 3 frames from not associated stations. hostapd sends
Johannes Berg571ecf62007-07-27 15:43:22 +02001141 * deauth/disassoc frames when needed. In addition, hostapd is
1142 * responsible for filtering on both auth and assoc states.
1143 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001144
Johannes Berg902acc72008-02-23 15:17:19 +01001145 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001146 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001147
Harvey Harrisona7767f92008-07-02 16:30:51 -07001148 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1149 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001150 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Bill Jordan1be7fe82010-10-01 11:20:41 -04001151 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
Rostislav Lisovy239281f2014-11-03 10:33:19 +01001152 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001153 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
Johannes Berg7852e362012-01-20 13:55:24 +01001154 /*
1155 * accept port control frames from the AP even when it's not
1156 * yet marked ASSOC to prevent a race where we don't set the
1157 * assoc bit quickly enough before it sends the first frame
1158 */
1159 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
Guy Eilam2a33bee2011-08-17 15:18:15 +03001160 ieee80211_is_data_present(hdr->frame_control)) {
Johannes Berg6dbda2d2012-10-26 00:41:23 +02001161 unsigned int hdrlen;
1162 __be16 ethertype;
Guy Eilam2a33bee2011-08-17 15:18:15 +03001163
Johannes Berg6dbda2d2012-10-26 00:41:23 +02001164 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1165
1166 if (rx->skb->len < hdrlen + 8)
1167 return RX_DROP_MONITOR;
1168
1169 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1170 if (ethertype == rx->sdata->control_port_protocol)
Guy Eilam2a33bee2011-08-17 15:18:15 +03001171 return RX_CONTINUE;
1172 }
Johannes Berg21fc7562011-11-04 11:18:13 +01001173
1174 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1175 cfg80211_rx_spurious_frame(rx->sdata->dev,
1176 hdr->addr2,
1177 GFP_ATOMIC))
1178 return RX_DROP_UNUSABLE;
1179
Johannes Berge4c26ad2008-01-31 19:48:21 +01001180 return RX_DROP_MONITOR;
Guy Eilam2a33bee2011-08-17 15:18:15 +03001181 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001182
Johannes Berg9ae54c82008-01-31 19:48:20 +01001183 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +02001184}
1185
1186
Johannes Berg49461622008-06-30 15:10:45 +02001187static ieee80211_rx_result debug_noinline
Kalle Valo572e0012009-02-10 17:09:31 +02001188ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1189{
1190 struct ieee80211_local *local;
1191 struct ieee80211_hdr *hdr;
1192 struct sk_buff *skb;
1193
1194 local = rx->local;
1195 skb = rx->skb;
1196 hdr = (struct ieee80211_hdr *) skb->data;
1197
1198 if (!local->pspolling)
1199 return RX_CONTINUE;
1200
1201 if (!ieee80211_has_fromds(hdr->frame_control))
1202 /* this is not from AP */
1203 return RX_CONTINUE;
1204
1205 if (!ieee80211_is_data(hdr->frame_control))
1206 return RX_CONTINUE;
1207
1208 if (!ieee80211_has_moredata(hdr->frame_control)) {
1209 /* AP has no more frames buffered for us */
1210 local->pspolling = false;
1211 return RX_CONTINUE;
1212 }
1213
1214 /* more data bit is set, let's request a new frame from the AP */
1215 ieee80211_send_pspoll(local, rx->sdata);
1216
1217 return RX_CONTINUE;
1218}
1219
Marco Porschd012a602012-10-10 12:39:50 -07001220static void sta_ps_start(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001221{
Johannes Berg133b8222008-09-16 14:18:59 +02001222 struct ieee80211_sub_if_data *sdata = sta->sdata;
Christian Lamparter4571d3b2008-11-30 00:48:41 +01001223 struct ieee80211_local *local = sdata->local;
Marco Porschd012a602012-10-10 12:39:50 -07001224 struct ps_data *ps;
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001225 int tid;
Joe Perches0795af52007-10-03 17:59:30 -07001226
Marco Porschd012a602012-10-10 12:39:50 -07001227 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1228 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1229 ps = &sdata->bss->ps;
1230 else
1231 return;
1232
1233 atomic_inc(&ps->num_sta_ps);
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001234 set_sta_flag(sta, WLAN_STA_PS_STA);
Johannes Berg30686bf2015-06-02 21:39:54 +02001235 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001236 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001237 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1238 sta->sta.addr, sta->sta.aid);
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001239
Johannes Berg17c18bf2015-03-21 15:25:43 +01001240 ieee80211_clear_fast_xmit(sta);
1241
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001242 if (!sta->sta.txq[0])
1243 return;
1244
1245 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1246 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1247
1248 if (!skb_queue_len(&txqi->queue))
1249 set_bit(tid, &sta->txq_buffered_tids);
1250 else
1251 clear_bit(tid, &sta->txq_buffered_tids);
1252 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001253}
1254
Marco Porschd012a602012-10-10 12:39:50 -07001255static void sta_ps_end(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001256{
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001257 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1258 sta->sta.addr, sta->sta.aid);
Johannes Berg004c8722008-02-20 11:21:35 +01001259
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001260 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
Johannes Berge3685e02014-02-20 11:19:58 +01001261 /*
1262 * Clear the flag only if the other one is still set
1263 * so that the TX path won't start TX'ing new frames
1264 * directly ... In the case that the driver flag isn't
1265 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1266 */
1267 clear_sta_flag(sta, WLAN_STA_PS_STA);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001268 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1269 sta->sta.addr, sta->sta.aid);
Johannes Bergaf818582009-11-06 11:35:50 +01001270 return;
1271 }
1272
Johannes Berg5ac2e352014-05-27 16:32:27 +02001273 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1274 clear_sta_flag(sta, WLAN_STA_PS_STA);
Johannes Bergaf818582009-11-06 11:35:50 +01001275 ieee80211_sta_ps_deliver_wakeup(sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001276}
1277
Johannes Bergcf471612015-06-16 16:16:38 +02001278int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001279{
Johannes Bergcf471612015-06-16 16:16:38 +02001280 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001281 bool in_ps;
1282
Johannes Bergcf471612015-06-16 16:16:38 +02001283 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001284
1285 /* Don't let the same PS state be set twice */
Johannes Bergcf471612015-06-16 16:16:38 +02001286 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001287 if ((start && in_ps) || (!start && !in_ps))
1288 return -EINVAL;
1289
1290 if (start)
Johannes Bergcf471612015-06-16 16:16:38 +02001291 sta_ps_start(sta);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001292 else
Johannes Bergcf471612015-06-16 16:16:38 +02001293 sta_ps_end(sta);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001294
1295 return 0;
1296}
1297EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1298
Johannes Berg49461622008-06-30 15:10:45 +02001299static ieee80211_rx_result debug_noinline
Johannes Berg47086fc2011-09-29 16:04:33 +02001300ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1301{
1302 struct ieee80211_sub_if_data *sdata = rx->sdata;
1303 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1304 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1305 int tid, ac;
1306
Johannes Berg5c900672015-04-22 14:48:34 +02001307 if (!rx->sta)
Johannes Berg47086fc2011-09-29 16:04:33 +02001308 return RX_CONTINUE;
1309
1310 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1311 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1312 return RX_CONTINUE;
1313
1314 /*
1315 * The device handles station powersave, so don't do anything about
1316 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1317 * it to mac80211 since they're handled.)
1318 */
Johannes Berg30686bf2015-06-02 21:39:54 +02001319 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
Johannes Berg47086fc2011-09-29 16:04:33 +02001320 return RX_CONTINUE;
1321
1322 /*
1323 * Don't do anything if the station isn't already asleep. In
1324 * the uAPSD case, the station will probably be marked asleep,
1325 * in the PS-Poll case the station must be confused ...
1326 */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001327 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
Johannes Berg47086fc2011-09-29 16:04:33 +02001328 return RX_CONTINUE;
1329
1330 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001331 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1332 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
Johannes Bergdeeaee12011-09-29 16:04:35 +02001333 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1334 else
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001335 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
Johannes Bergdeeaee12011-09-29 16:04:35 +02001336 }
Johannes Berg47086fc2011-09-29 16:04:33 +02001337
1338 /* Free PS Poll skb here instead of returning RX_DROP that would
1339 * count as an dropped frame. */
1340 dev_kfree_skb(rx->skb);
1341
1342 return RX_QUEUED;
1343 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1344 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1345 ieee80211_has_pm(hdr->frame_control) &&
1346 (ieee80211_is_data_qos(hdr->frame_control) ||
1347 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1348 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1349 ac = ieee802_1d_to_ac[tid & 7];
1350
1351 /*
1352 * If this AC is not trigger-enabled do nothing.
1353 *
1354 * NB: This could/should check a separate bitmap of trigger-
1355 * enabled queues, but for now we only implement uAPSD w/o
1356 * TSPEC changes to the ACs, so they're always the same.
1357 */
1358 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1359 return RX_CONTINUE;
1360
1361 /* if we are in a service period, do nothing */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001362 if (test_sta_flag(rx->sta, WLAN_STA_SP))
Johannes Berg47086fc2011-09-29 16:04:33 +02001363 return RX_CONTINUE;
1364
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001365 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
Johannes Berg47086fc2011-09-29 16:04:33 +02001366 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1367 else
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001368 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
Johannes Berg47086fc2011-09-29 16:04:33 +02001369 }
1370
1371 return RX_CONTINUE;
1372}
1373
1374static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001375ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001376{
1377 struct sta_info *sta = rx->sta;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001378 struct sk_buff *skb = rx->skb;
1379 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1380 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Felix Fietkauef0621e2013-04-22 16:29:31 +02001381 int i;
Johannes Berg571ecf62007-07-27 15:43:22 +02001382
1383 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001384 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001385
Johannes Bergb291ba12009-07-10 15:29:03 +02001386 /*
1387 * Update last_rx only for IBSS packets which are for the current
Antonio Quartullie584da5e2012-11-25 23:13:42 +01001388 * BSSID and for station already AUTHORIZED to avoid keeping the
1389 * current IBSS network alive in cases where other STAs start
1390 * using different BSSID. This will also give the station another
1391 * chance to restart the authentication/authorization in case
1392 * something went wrong the first time.
Johannes Bergb291ba12009-07-10 15:29:03 +02001393 */
Johannes Berg05c914f2008-09-11 00:01:58 +02001394 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001395 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +02001396 NL80211_IFTYPE_ADHOC);
Antonio Quartullie584da5e2012-11-25 23:13:42 +01001397 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1398 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001399 sta->last_rx = jiffies;
Henning Roggef4ebddf2014-05-01 10:03:46 +02001400 if (ieee80211_is_data(hdr->frame_control) &&
1401 !is_multicast_ether_addr(hdr->addr1)) {
Felix Fietkau3af63342011-02-27 22:08:01 +01001402 sta->last_rx_rate_idx = status->rate_idx;
1403 sta->last_rx_rate_flag = status->flag;
Emmanuel Grumbach1b8d2422014-02-05 16:37:11 +02001404 sta->last_rx_rate_vht_flag = status->vht_flag;
Johannes Berg56146182012-11-09 15:07:02 +01001405 sta->last_rx_rate_vht_nss = status->vht_nss;
Felix Fietkau3af63342011-02-27 22:08:01 +01001406 }
1407 }
Rostislav Lisovy239281f2014-11-03 10:33:19 +01001408 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
Johannes Berg6fe3eac2015-04-22 15:10:45 +02001409 sta->last_rx = jiffies;
Johannes Bergb291ba12009-07-10 15:29:03 +02001410 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1411 /*
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001412 * Mesh beacons will update last_rx when if they are found to
1413 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +02001414 */
Johannes Bergb291ba12009-07-10 15:29:03 +02001415 sta->last_rx = jiffies;
Felix Fietkau3af63342011-02-27 22:08:01 +01001416 if (ieee80211_is_data(hdr->frame_control)) {
1417 sta->last_rx_rate_idx = status->rate_idx;
1418 sta->last_rx_rate_flag = status->flag;
Chun-Yeow Yeohb8ff4162014-02-27 13:14:14 +08001419 sta->last_rx_rate_vht_flag = status->vht_flag;
Johannes Berg56146182012-11-09 15:07:02 +01001420 sta->last_rx_rate_vht_nss = status->vht_nss;
Felix Fietkau3af63342011-02-27 22:08:01 +01001421 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001422 }
1423
Kalle Valo3cf335d2009-03-22 21:57:06 +02001424 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1425 ieee80211_sta_rx_notify(rx->sdata, hdr);
1426
Johannes Berg571ecf62007-07-27 15:43:22 +02001427 sta->rx_fragments++;
1428 sta->rx_bytes += rx->skb->len;
Felix Fietkaufe8431f2012-03-01 18:00:07 +01001429 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1430 sta->last_signal = status->signal;
Johannes Berg40d9a382015-07-13 12:26:46 +02001431 ewma_signal_add(&sta->avg_signal, -status->signal);
Felix Fietkaufe8431f2012-03-01 18:00:07 +01001432 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001433
Felix Fietkauef0621e2013-04-22 16:29:31 +02001434 if (status->chains) {
1435 sta->chains = status->chains;
1436 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1437 int signal = status->chain_signal[i];
1438
1439 if (!(status->chains & BIT(i)))
1440 continue;
1441
1442 sta->chain_signal_last[i] = signal;
Johannes Berg40d9a382015-07-13 12:26:46 +02001443 ewma_signal_add(&sta->chain_signal_avg[i], -signal);
Felix Fietkauef0621e2013-04-22 16:29:31 +02001444 }
1445 }
1446
Johannes Berg72eaa432008-11-26 15:02:58 +01001447 /*
1448 * Change STA power saving mode only at the end of a frame
1449 * exchange sequence.
1450 */
Johannes Berg30686bf2015-06-02 21:39:54 +02001451 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001452 !ieee80211_has_morefrags(hdr->frame_control) &&
Christian Lamparter4cfda472010-12-27 23:21:26 +01001453 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001454 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
Johannes Bergb4ba5442014-01-24 14:41:44 +01001455 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1456 /* PM bit is only checked in frames where it isn't reserved,
1457 * in AP mode it's reserved in non-bufferable management frames
1458 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1459 */
1460 (!ieee80211_is_mgmt(hdr->frame_control) ||
1461 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001462 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
Johannes Bergb4ba5442014-01-24 14:41:44 +01001463 if (!ieee80211_has_pm(hdr->frame_control))
Marco Porschd012a602012-10-10 12:39:50 -07001464 sta_ps_end(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001465 } else {
1466 if (ieee80211_has_pm(hdr->frame_control))
Marco Porschd012a602012-10-10 12:39:50 -07001467 sta_ps_start(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001468 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001469 }
1470
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001471 /* mesh power save support */
1472 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1473 ieee80211_mps_rx_h_sta_process(sta, hdr);
1474
Johannes Berg22403de2009-10-30 12:55:03 +01001475 /*
1476 * Drop (qos-)data::nullfunc frames silently, since they
1477 * are used only to control station power saving mode.
1478 */
1479 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1480 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001481 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
Felix Fietkaud5242152010-01-08 18:06:26 +01001482
1483 /*
1484 * If we receive a 4-addr nullfunc frame from a STA
Johannes Berge7f4a942011-11-04 11:18:20 +01001485 * that was not moved to a 4-addr STA vlan yet send
1486 * the event to userspace and for older hostapd drop
1487 * the frame to the monitor interface.
Felix Fietkaud5242152010-01-08 18:06:26 +01001488 */
1489 if (ieee80211_has_a4(hdr->frame_control) &&
1490 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1491 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
Johannes Berge7f4a942011-11-04 11:18:20 +01001492 !rx->sdata->u.vlan.sta))) {
1493 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1494 cfg80211_rx_unexpected_4addr_frame(
1495 rx->sdata->dev, sta->sta.addr,
1496 GFP_ATOMIC);
Felix Fietkaud5242152010-01-08 18:06:26 +01001497 return RX_DROP_MONITOR;
Johannes Berge7f4a942011-11-04 11:18:20 +01001498 }
Johannes Berg22403de2009-10-30 12:55:03 +01001499 /*
1500 * Update counter and free packet here to avoid
1501 * counting this as a dropped packed.
1502 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001503 sta->rx_packets++;
1504 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001505 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001506 }
1507
Johannes Berg9ae54c82008-01-31 19:48:20 +01001508 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001509} /* ieee80211_rx_h_sta_process */
1510
Johan Almbladh86c228a2013-08-14 15:29:46 +02001511static ieee80211_rx_result debug_noinline
1512ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1513{
1514 struct sk_buff *skb = rx->skb;
1515 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1516 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1517 int keyidx;
1518 int hdrlen;
1519 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1520 struct ieee80211_key *sta_ptk = NULL;
1521 int mmie_keyidx = -1;
1522 __le16 fc;
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001523 const struct ieee80211_cipher_scheme *cs = NULL;
Johan Almbladh86c228a2013-08-14 15:29:46 +02001524
1525 /*
1526 * Key selection 101
1527 *
1528 * There are four types of keys:
1529 * - GTK (group keys)
1530 * - IGTK (group keys for management frames)
1531 * - PTK (pairwise keys)
1532 * - STK (station-to-station pairwise keys)
1533 *
1534 * When selecting a key, we have to distinguish between multicast
1535 * (including broadcast) and unicast frames, the latter can only
1536 * use PTKs and STKs while the former always use GTKs and IGTKs.
1537 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1538 * unicast frames can also use key indices like GTKs. Hence, if we
1539 * don't have a PTK/STK we check the key index for a WEP key.
1540 *
1541 * Note that in a regular BSS, multicast frames are sent by the
1542 * AP only, associated stations unicast the frame to the AP first
1543 * which then multicasts it on their behalf.
1544 *
1545 * There is also a slight problem in IBSS mode: GTKs are negotiated
1546 * with each station, that is something we don't currently handle.
1547 * The spec seems to expect that one negotiates the same key with
1548 * every station but there's no such requirement; VLANs could be
1549 * possible.
1550 */
1551
Johan Almbladh86c228a2013-08-14 15:29:46 +02001552 /* start without a key */
1553 rx->key = NULL;
Johan Almbladh86c228a2013-08-14 15:29:46 +02001554 fc = hdr->frame_control;
1555
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001556 if (rx->sta) {
1557 int keyid = rx->sta->ptk_idx;
1558
1559 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1560 cs = rx->sta->cipher_scheme;
1561 keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1562 if (unlikely(keyid < 0))
1563 return RX_DROP_UNUSABLE;
1564 }
1565 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1566 }
1567
Johan Almbladh86c228a2013-08-14 15:29:46 +02001568 if (!ieee80211_has_protected(fc))
1569 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1570
1571 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1572 rx->key = sta_ptk;
1573 if ((status->flag & RX_FLAG_DECRYPTED) &&
1574 (status->flag & RX_FLAG_IV_STRIPPED))
1575 return RX_CONTINUE;
1576 /* Skip decryption if the frame is not protected. */
1577 if (!ieee80211_has_protected(fc))
1578 return RX_CONTINUE;
1579 } else if (mmie_keyidx >= 0) {
1580 /* Broadcast/multicast robust management frame / BIP */
1581 if ((status->flag & RX_FLAG_DECRYPTED) &&
1582 (status->flag & RX_FLAG_IV_STRIPPED))
1583 return RX_CONTINUE;
1584
1585 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1586 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1587 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1588 if (rx->sta)
1589 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1590 if (!rx->key)
1591 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1592 } else if (!ieee80211_has_protected(fc)) {
1593 /*
1594 * The frame was not protected, so skip decryption. However, we
1595 * need to set rx->key if there is a key that could have been
1596 * used so that the frame may be dropped if encryption would
1597 * have been expected.
1598 */
1599 struct ieee80211_key *key = NULL;
1600 struct ieee80211_sub_if_data *sdata = rx->sdata;
1601 int i;
1602
1603 if (ieee80211_is_mgmt(fc) &&
1604 is_multicast_ether_addr(hdr->addr1) &&
1605 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1606 rx->key = key;
1607 else {
1608 if (rx->sta) {
1609 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1610 key = rcu_dereference(rx->sta->gtk[i]);
1611 if (key)
1612 break;
1613 }
1614 }
1615 if (!key) {
1616 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1617 key = rcu_dereference(sdata->keys[i]);
1618 if (key)
1619 break;
1620 }
1621 }
1622 if (key)
1623 rx->key = key;
1624 }
1625 return RX_CONTINUE;
1626 } else {
1627 u8 keyid;
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001628
Johan Almbladh86c228a2013-08-14 15:29:46 +02001629 /*
1630 * The device doesn't give us the IV so we won't be
1631 * able to look up the key. That's ok though, we
1632 * don't need to decrypt the frame, we just won't
1633 * be able to keep statistics accurate.
1634 * Except for key threshold notifications, should
1635 * we somehow allow the driver to tell us which key
1636 * the hardware used if this flag is set?
1637 */
1638 if ((status->flag & RX_FLAG_DECRYPTED) &&
1639 (status->flag & RX_FLAG_IV_STRIPPED))
1640 return RX_CONTINUE;
1641
1642 hdrlen = ieee80211_hdrlen(fc);
1643
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001644 if (cs) {
1645 keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
Johan Almbladh86c228a2013-08-14 15:29:46 +02001646
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001647 if (unlikely(keyidx < 0))
1648 return RX_DROP_UNUSABLE;
1649 } else {
1650 if (rx->skb->len < 8 + hdrlen)
1651 return RX_DROP_UNUSABLE; /* TODO: count this? */
1652 /*
1653 * no need to call ieee80211_wep_get_keyidx,
1654 * it verifies a bunch of things we've done already
1655 */
1656 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1657 keyidx = keyid >> 6;
1658 }
Johan Almbladh86c228a2013-08-14 15:29:46 +02001659
1660 /* check per-station GTK first, if multicast packet */
1661 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1662 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1663
1664 /* if not found, try default key */
1665 if (!rx->key) {
1666 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1667
1668 /*
1669 * RSNA-protected unicast frames should always be
1670 * sent with pairwise or station-to-station keys,
1671 * but for WEP we allow using a key index as well.
1672 */
1673 if (rx->key &&
1674 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1675 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1676 !is_multicast_ether_addr(hdr->addr1))
1677 rx->key = NULL;
1678 }
1679 }
1680
1681 if (rx->key) {
1682 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1683 return RX_DROP_MONITOR;
1684
Johan Almbladh86c228a2013-08-14 15:29:46 +02001685 /* TODO: add threshold stuff again */
1686 } else {
1687 return RX_DROP_MONITOR;
1688 }
1689
1690 switch (rx->key->conf.cipher) {
1691 case WLAN_CIPHER_SUITE_WEP40:
1692 case WLAN_CIPHER_SUITE_WEP104:
1693 result = ieee80211_crypto_wep_decrypt(rx);
1694 break;
1695 case WLAN_CIPHER_SUITE_TKIP:
1696 result = ieee80211_crypto_tkip_decrypt(rx);
1697 break;
1698 case WLAN_CIPHER_SUITE_CCMP:
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +02001699 result = ieee80211_crypto_ccmp_decrypt(
1700 rx, IEEE80211_CCMP_MIC_LEN);
1701 break;
1702 case WLAN_CIPHER_SUITE_CCMP_256:
1703 result = ieee80211_crypto_ccmp_decrypt(
1704 rx, IEEE80211_CCMP_256_MIC_LEN);
Johan Almbladh86c228a2013-08-14 15:29:46 +02001705 break;
1706 case WLAN_CIPHER_SUITE_AES_CMAC:
1707 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1708 break;
Jouni Malinen56c52da2015-01-24 19:52:08 +02001709 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1710 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1711 break;
Jouni Malinen8ade5382015-01-24 19:52:09 +02001712 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1713 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1714 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1715 break;
Jouni Malinen00b9cfa2015-01-24 19:52:06 +02001716 case WLAN_CIPHER_SUITE_GCMP:
1717 case WLAN_CIPHER_SUITE_GCMP_256:
1718 result = ieee80211_crypto_gcmp_decrypt(rx);
1719 break;
Johan Almbladh86c228a2013-08-14 15:29:46 +02001720 default:
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001721 result = ieee80211_crypto_hw_decrypt(rx);
Johan Almbladh86c228a2013-08-14 15:29:46 +02001722 }
1723
1724 /* the hdr variable is invalid after the decrypt handlers */
1725
1726 /* either the frame has been decrypted or will be dropped */
1727 status->flag |= RX_FLAG_DECRYPTED;
1728
1729 return result;
1730}
1731
Johannes Berg571ecf62007-07-27 15:43:22 +02001732static inline struct ieee80211_fragment_entry *
1733ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1734 unsigned int frag, unsigned int seq, int rx_queue,
1735 struct sk_buff **skb)
1736{
1737 struct ieee80211_fragment_entry *entry;
Johannes Berg571ecf62007-07-27 15:43:22 +02001738
Johannes Berg571ecf62007-07-27 15:43:22 +02001739 entry = &sdata->fragments[sdata->fragment_next++];
1740 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1741 sdata->fragment_next = 0;
1742
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001743 if (!skb_queue_empty(&entry->skb_list))
Johannes Berg571ecf62007-07-27 15:43:22 +02001744 __skb_queue_purge(&entry->skb_list);
Johannes Berg571ecf62007-07-27 15:43:22 +02001745
1746 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1747 *skb = NULL;
1748 entry->first_frag_time = jiffies;
1749 entry->seq = seq;
1750 entry->rx_queue = rx_queue;
1751 entry->last_frag = frag;
1752 entry->ccmp = 0;
1753 entry->extra_len = 0;
1754
1755 return entry;
1756}
1757
1758static inline struct ieee80211_fragment_entry *
1759ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001760 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +02001761 int rx_queue, struct ieee80211_hdr *hdr)
1762{
1763 struct ieee80211_fragment_entry *entry;
1764 int i, idx;
1765
1766 idx = sdata->fragment_next;
1767 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1768 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +02001769
1770 idx--;
1771 if (idx < 0)
1772 idx = IEEE80211_FRAGMENT_MAX - 1;
1773
1774 entry = &sdata->fragments[idx];
1775 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1776 entry->rx_queue != rx_queue ||
1777 entry->last_frag + 1 != frag)
1778 continue;
1779
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001780 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001781
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001782 /*
1783 * Check ftype and addresses are equal, else check next fragment
1784 */
1785 if (((hdr->frame_control ^ f_hdr->frame_control) &
1786 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Joe Perchesb203ca32012-05-08 18:56:52 +00001787 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1788 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
Johannes Berg571ecf62007-07-27 15:43:22 +02001789 continue;
1790
S.Çağlar Onurab466232008-02-14 17:36:47 +02001791 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001792 __skb_queue_purge(&entry->skb_list);
1793 continue;
1794 }
1795 return entry;
1796 }
1797
1798 return NULL;
1799}
1800
Johannes Berg49461622008-06-30 15:10:45 +02001801static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001802ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001803{
1804 struct ieee80211_hdr *hdr;
1805 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001806 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001807 unsigned int frag, seq;
1808 struct ieee80211_fragment_entry *entry;
1809 struct sk_buff *skb;
Johannes Berg554891e2010-09-24 12:38:25 +02001810 struct ieee80211_rx_status *status;
Johannes Berg571ecf62007-07-27 15:43:22 +02001811
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001812 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001813 fc = hdr->frame_control;
Javier Cardonaf7fbf702012-10-25 11:10:18 -07001814
1815 if (ieee80211_is_ctl(fc))
1816 return RX_CONTINUE;
1817
Johannes Berg571ecf62007-07-27 15:43:22 +02001818 sc = le16_to_cpu(hdr->seq_ctrl);
1819 frag = sc & IEEE80211_SCTL_FRAG;
1820
Johannes Bergb8fff402014-11-03 13:57:46 +01001821 if (is_multicast_ether_addr(hdr->addr1)) {
Johannes Bergc206ca62015-04-22 20:47:28 +02001822 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
Andreas Müllerd0259332014-12-12 12:11:11 +01001823 goto out_no_led;
Johannes Berg571ecf62007-07-27 15:43:22 +02001824 }
Johannes Bergb8fff402014-11-03 13:57:46 +01001825
Andreas Müllerd0259332014-12-12 12:11:11 +01001826 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1827 goto out;
1828
Johannes Berg571ecf62007-07-27 15:43:22 +02001829 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1830
Zhu Yie3cf8b32010-03-29 17:35:07 +08001831 if (skb_linearize(rx->skb))
1832 return RX_DROP_UNUSABLE;
1833
Abhijeet Kolekar058897a2010-05-11 11:22:11 -07001834 /*
1835 * skb_linearize() might change the skb->data and
1836 * previously cached variables (in this case, hdr) need to
1837 * be refreshed with the new data.
1838 */
1839 hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001840 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1841
1842 if (frag == 0) {
1843 /* This is the first fragment of a new frame. */
1844 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg9e262972011-07-07 18:45:03 +02001845 rx->seqno_idx, &(rx->skb));
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +02001846 if (rx->key &&
1847 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1848 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256) &&
Harvey Harrison358c8d92008-07-15 18:44:13 -07001849 ieee80211_has_protected(fc)) {
Johannes Berg9e262972011-07-07 18:45:03 +02001850 int queue = rx->security_idx;
Johannes Berg571ecf62007-07-27 15:43:22 +02001851 /* Store CCMP PN so that we can verify that the next
1852 * fragment has a sequential PN value. */
1853 entry->ccmp = 1;
1854 memcpy(entry->last_pn,
Jouni Malinen91902522010-06-11 10:27:33 -07001855 rx->key->u.ccmp.rx_pn[queue],
Johannes Berg4325f6c2013-05-08 13:09:08 +02001856 IEEE80211_CCMP_PN_LEN);
Johannes Berg571ecf62007-07-27 15:43:22 +02001857 }
Johannes Berg9ae54c82008-01-31 19:48:20 +01001858 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001859 }
1860
1861 /* This is a fragment for a frame that should already be pending in
1862 * fragment cache. Add this fragment to the end of the pending entry.
1863 */
Johannes Berg9e262972011-07-07 18:45:03 +02001864 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1865 rx->seqno_idx, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001866 if (!entry) {
1867 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001868 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001869 }
1870
1871 /* Verify that MPDUs within one MSDU have sequential PN values.
1872 * (IEEE 802.11i, 8.3.3.4.5) */
1873 if (entry->ccmp) {
1874 int i;
Johannes Berg4325f6c2013-05-08 13:09:08 +02001875 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
Jouni Malinen91902522010-06-11 10:27:33 -07001876 int queue;
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +02001877 if (!rx->key ||
1878 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1879 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001880 return RX_DROP_UNUSABLE;
Johannes Berg4325f6c2013-05-08 13:09:08 +02001881 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1882 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001883 pn[i]++;
1884 if (pn[i])
1885 break;
1886 }
Johannes Berg9e262972011-07-07 18:45:03 +02001887 queue = rx->security_idx;
Jouni Malinen91902522010-06-11 10:27:33 -07001888 rpn = rx->key->u.ccmp.rx_pn[queue];
Johannes Berg4325f6c2013-05-08 13:09:08 +02001889 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001890 return RX_DROP_UNUSABLE;
Johannes Berg4325f6c2013-05-08 13:09:08 +02001891 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
Johannes Berg571ecf62007-07-27 15:43:22 +02001892 }
1893
Harvey Harrison358c8d92008-07-15 18:44:13 -07001894 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +02001895 __skb_queue_tail(&entry->skb_list, rx->skb);
1896 entry->last_frag = frag;
1897 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001898 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001899 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001900 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001901 }
1902
1903 rx->skb = __skb_dequeue(&entry->skb_list);
1904 if (skb_tailroom(rx->skb) < entry->extra_len) {
Johannes Bergf1160432015-04-22 20:25:20 +02001905 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
Johannes Berg571ecf62007-07-27 15:43:22 +02001906 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1907 GFP_ATOMIC))) {
1908 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1909 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001910 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001911 }
1912 }
1913 while ((skb = __skb_dequeue(&entry->skb_list))) {
1914 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1915 dev_kfree_skb(skb);
1916 }
1917
1918 /* Complete frame has been reassembled - process it now */
Johannes Berg554891e2010-09-24 12:38:25 +02001919 status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001920
1921 out:
Andreas Müllerd0259332014-12-12 12:11:11 +01001922 ieee80211_led_rx(rx->local);
1923 out_no_led:
Johannes Berg571ecf62007-07-27 15:43:22 +02001924 if (rx->sta)
1925 rx->sta->rx_packets++;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001926 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001927}
1928
Johannes Berg1df332e2012-10-26 00:09:11 +02001929static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001930{
Johannes Berg1df332e2012-10-26 00:09:11 +02001931 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001932 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001933
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001934 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001935}
1936
Johannes Berg1df332e2012-10-26 00:09:11 +02001937static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02001938{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001939 struct sk_buff *skb = rx->skb;
1940 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1941
Johannes Berg3017b802007-08-28 17:01:53 -04001942 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001943 * Pass through unencrypted frames if the hardware has
1944 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001945 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001946 if (status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001947 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001948
1949 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001950 if (unlikely(!ieee80211_has_protected(fc) &&
1951 !ieee80211_is_nullfunc(fc) &&
Johannes Berge8f4fb72015-03-20 11:37:36 +01001952 ieee80211_is_data(fc) && rx->key))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001953 return -EACCES;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001954
1955 return 0;
1956}
1957
Johannes Berg1df332e2012-10-26 00:09:11 +02001958static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001959{
1960 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Jouni Malinene3efca02010-03-28 22:31:15 -07001961 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001962 __le16 fc = hdr->frame_control;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001963
Jouni Malinene3efca02010-03-28 22:31:15 -07001964 /*
1965 * Pass through unencrypted frames if the hardware has
1966 * decrypted them already.
1967 */
1968 if (status->flag & RX_FLAG_DECRYPTED)
1969 return 0;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001970
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001971 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
Jouni Malinend211e902010-03-28 22:29:52 -07001972 if (unlikely(!ieee80211_has_protected(fc) &&
1973 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02001974 rx->key)) {
Johannes Berg6ff57cf2013-05-16 00:55:00 +02001975 if (ieee80211_is_deauth(fc) ||
1976 ieee80211_is_disassoc(fc))
1977 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1978 rx->skb->data,
1979 rx->skb->len);
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001980 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02001981 }
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001982 /* BIP does not use Protected field, so need to check MMIE */
Joe Perchesf64f9e72009-11-29 16:55:45 -08001983 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02001984 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
Johannes Berg6ff57cf2013-05-16 00:55:00 +02001985 if (ieee80211_is_deauth(fc) ||
1986 ieee80211_is_disassoc(fc))
1987 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1988 rx->skb->data,
1989 rx->skb->len);
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001990 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02001991 }
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001992 /*
1993 * When using MFP, Action frames are not allowed prior to
1994 * having configured keys.
1995 */
1996 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
Johannes Bergd8ca16d2014-01-23 16:20:29 +01001997 ieee80211_is_robust_mgmt_frame(rx->skb)))
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001998 return -EACCES;
1999 }
Johannes Bergb3fc9c62008-04-13 10:12:47 +02002000
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002001 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02002002}
2003
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002004static int
Felix Fietkau4114fa22011-04-12 19:15:22 +02002005__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
Johannes Berg571ecf62007-07-27 15:43:22 +02002006{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002007 struct ieee80211_sub_if_data *sdata = rx->sdata;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002008 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002009 bool check_port_control = false;
2010 struct ethhdr *ehdr;
2011 int ret;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002012
Felix Fietkau4114fa22011-04-12 19:15:22 +02002013 *port_control = false;
Johannes Berg9bc383d2009-11-19 11:55:19 +01002014 if (ieee80211_has_a4(hdr->frame_control) &&
2015 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002016 return -1;
Johannes Berg9bc383d2009-11-19 11:55:19 +01002017
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002018 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2019 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2020
2021 if (!sdata->u.mgd.use_4addr)
2022 return -1;
2023 else
2024 check_port_control = true;
2025 }
2026
Johannes Berg9bc383d2009-11-19 11:55:19 +01002027 if (is_multicast_ether_addr(hdr->addr1) &&
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002028 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002029 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02002030
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002031 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
Felix Fietkau4114fa22011-04-12 19:15:22 +02002032 if (ret < 0)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002033 return ret;
2034
2035 ehdr = (struct ethhdr *) rx->skb->data;
Felix Fietkau4114fa22011-04-12 19:15:22 +02002036 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2037 *port_control = true;
2038 else if (check_port_control)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002039 return -1;
2040
2041 return 0;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002042}
Johannes Berg571ecf62007-07-27 15:43:22 +02002043
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002044/*
2045 * requires that rx->skb is a frame with ethernet header
2046 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07002047static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002048{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05302049 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002050 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2051 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2052
2053 /*
2054 * Allow EAPOL frames to us/the PAE group address regardless
2055 * of whether the frame was encrypted or not.
2056 */
Johannes Berga621fa42010-08-27 14:26:54 +03002057 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
Joe Perches3bc79452012-05-08 18:56:53 +00002058 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2059 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002060 return true;
2061
2062 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07002063 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002064 return false;
2065
2066 return true;
2067}
2068
2069/*
2070 * requires that rx->skb is a frame with ethernet header
2071 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002072static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01002073ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002074{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002075 struct ieee80211_sub_if_data *sdata = rx->sdata;
2076 struct net_device *dev = sdata->dev;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002077 struct sk_buff *skb, *xmit_skb;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002078 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2079 struct sta_info *dsta;
Johannes Berg571ecf62007-07-27 15:43:22 +02002080
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002081 skb = rx->skb;
2082 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02002083
Johannes Berg5a490512015-04-22 17:10:38 +02002084 ieee80211_rx_stats(dev, skb->len);
2085
Johannes Berg05c914f2008-09-11 00:01:58 +02002086 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2087 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02002088 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg9bc383d2009-11-19 11:55:19 +01002089 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002090 if (is_multicast_ether_addr(ehdr->h_dest)) {
2091 /*
2092 * send multicast frames both to higher layers in
2093 * local net stack and back to the wireless medium
2094 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002095 xmit_skb = skb_copy(skb, GFP_ATOMIC);
Joe Perchese87cc472012-05-13 21:56:26 +00002096 if (!xmit_skb)
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02002097 net_info_ratelimited("%s: failed to clone multicast frame\n",
Joe Perchese87cc472012-05-13 21:56:26 +00002098 dev->name);
Johannes Berg571ecf62007-07-27 15:43:22 +02002099 } else {
Johannes Bergabe60632009-11-25 17:46:18 +01002100 dsta = sta_info_get(sdata, skb->data);
2101 if (dsta) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002102 /*
2103 * The destination station is associated to
2104 * this AP (in this VLAN), so send the frame
2105 * directly to it and do not pass it to local
2106 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02002107 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002108 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02002109 skb = NULL;
2110 }
Johannes Berg571ecf62007-07-27 15:43:22 +02002111 }
2112 }
2113
Kalle Valo59d9cb02009-12-17 13:54:57 +01002114#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
Johannes Berg9e890a1f2013-12-04 09:16:31 +01002115 if (skb) {
2116 /* 'align' will only take the values 0 or 2 here since all
2117 * frames are required to be aligned to 2-byte boundaries
2118 * when being passed to mac80211; the code here works just
2119 * as well if that isn't true, but mac80211 assumes it can
2120 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
Johannes Bergd1c3a372009-01-07 00:26:10 +01002121 */
Johannes Berg9e890a1f2013-12-04 09:16:31 +01002122 int align;
2123
2124 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01002125 if (align) {
2126 if (WARN_ON(skb_headroom(skb) < 3)) {
2127 dev_kfree_skb(skb);
2128 skb = NULL;
2129 } else {
2130 u8 *data = skb->data;
Zhu Yi8ce0b582009-10-28 13:13:52 -07002131 size_t len = skb_headlen(skb);
2132 skb->data -= align;
2133 memmove(skb->data, data, len);
2134 skb_set_tail_pointer(skb, len);
Johannes Bergd1c3a372009-01-07 00:26:10 +01002135 }
2136 }
Johannes Berg9e890a1f2013-12-04 09:16:31 +01002137 }
Johannes Bergd1c3a372009-01-07 00:26:10 +01002138#endif
2139
Johannes Berg9e890a1f2013-12-04 09:16:31 +01002140 if (skb) {
2141 /* deliver to local stack */
2142 skb->protocol = eth_type_trans(skb, dev);
2143 memset(skb->cb, 0, sizeof(skb->cb));
Johannes Bergaf9f9b22015-06-11 16:02:32 +02002144 if (rx->napi)
2145 napi_gro_receive(rx->napi, skb);
Johannes Berg06d181a2014-02-04 20:51:09 +01002146 else
2147 netif_receive_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002148 }
2149
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002150 if (xmit_skb) {
Helmut Schaaaef6c922011-12-21 09:11:35 +01002151 /*
2152 * Send to wireless media and increase priority by 256 to
2153 * keep the received priority instead of reclassifying
2154 * the frame (see cfg80211_classify8021d).
2155 */
2156 xmit_skb->priority += 256;
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09002157 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002158 skb_reset_network_header(xmit_skb);
2159 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002160 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002161 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002162}
2163
Johannes Berg49461622008-06-30 15:10:45 +02002164static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002165ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002166{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002167 struct net_device *dev = rx->sdata->dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08002168 struct sk_buff *skb = rx->skb;
Harvey Harrison358c8d92008-07-15 18:44:13 -07002169 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2170 __le16 fc = hdr->frame_control;
Zhu Yieaf85ca2009-12-01 10:18:37 +08002171 struct sk_buff_head frame_list;
Johannes Berg554891e2010-09-24 12:38:25 +02002172 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002173
Harvey Harrison358c8d92008-07-15 18:44:13 -07002174 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002175 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002176
Harvey Harrison358c8d92008-07-15 18:44:13 -07002177 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002178 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002179
Johannes Berg554891e2010-09-24 12:38:25 +02002180 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002181 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002182
Zhu Yieaf85ca2009-12-01 10:18:37 +08002183 if (ieee80211_has_a4(hdr->frame_control) &&
2184 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2185 !rx->sdata->u.vlan.sta)
2186 return RX_DROP_UNUSABLE;
2187
2188 if (is_multicast_ether_addr(hdr->addr1) &&
2189 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2190 rx->sdata->u.vlan.sta) ||
2191 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2192 rx->sdata->u.mgd.use_4addr)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002193 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002194
2195 skb->dev = dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08002196 __skb_queue_head_init(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002197
Zhu Yie3cf8b32010-03-29 17:35:07 +08002198 if (skb_linearize(skb))
2199 return RX_DROP_UNUSABLE;
2200
Zhu Yieaf85ca2009-12-01 10:18:37 +08002201 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2202 rx->sdata->vif.type,
Yogesh Ashok Powar8b3beca2011-05-13 11:22:31 -07002203 rx->local->hw.extra_tx_headroom, true);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002204
Zhu Yieaf85ca2009-12-01 10:18:37 +08002205 while (!skb_queue_empty(&frame_list)) {
2206 rx->skb = __skb_dequeue(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002207
Harvey Harrison358c8d92008-07-15 18:44:13 -07002208 if (!ieee80211_frame_allowed(rx, fc)) {
Zhu Yieaf85ca2009-12-01 10:18:37 +08002209 dev_kfree_skb(rx->skb);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002210 continue;
2211 }
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002212
2213 ieee80211_deliver_skb(rx);
2214 }
2215
Johannes Berg9ae54c82008-01-31 19:48:20 +01002216 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002217}
2218
Ingo Molnarbf94e172008-10-12 23:51:38 -07002219#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02002220static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002221ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2222{
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002223 struct ieee80211_hdr *fwd_hdr, *hdr;
2224 struct ieee80211_tx_info *info;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002225 struct ieee80211s_hdr *mesh_hdr;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002226 struct sk_buff *skb = rx->skb, *fwd_skb;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002227 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002228 struct ieee80211_sub_if_data *sdata = rx->sdata;
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002229 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002230 u16 q, hdrlen;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002231
2232 hdr = (struct ieee80211_hdr *) skb->data;
2233 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg9b395bc2012-10-26 00:36:40 +02002234
2235 /* make sure fixed part of mesh header is there, also checks skb len */
2236 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2237 return RX_DROP_MONITOR;
2238
2239 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2240
2241 /* make sure full mesh header is there, also checks skb len */
2242 if (!pskb_may_pull(rx->skb,
2243 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2244 return RX_DROP_MONITOR;
2245
2246 /* reload pointers */
2247 hdr = (struct ieee80211_hdr *) skb->data;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002248 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2249
Bob Copelandd0c22112015-03-02 14:28:52 -05002250 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2251 return RX_DROP_MONITOR;
2252
Thomas Pedersen2157fdd2011-09-01 12:32:14 -07002253 /* frame is in RMC, don't forward */
2254 if (ieee80211_is_data(hdr->frame_control) &&
2255 is_multicast_ether_addr(hdr->addr1) &&
Johannes Bergbf7cd942013-02-15 14:40:31 +01002256 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
Thomas Pedersen2157fdd2011-09-01 12:32:14 -07002257 return RX_DROP_MONITOR;
2258
Johannes Berg5c900672015-04-22 14:48:34 +02002259 if (!ieee80211_is_data(hdr->frame_control))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002260 return RX_CONTINUE;
2261
2262 if (!mesh_hdr->ttl)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002263 return RX_DROP_MONITOR;
2264
Javier Cardona43b7b312009-10-15 18:10:51 -07002265 if (mesh_hdr->flags & MESH_FLAGS_AE) {
YanBo79617de2008-09-22 13:30:32 +08002266 struct mesh_path *mppath;
Javier Cardona43b7b312009-10-15 18:10:51 -07002267 char *proxied_addr;
2268 char *mpp_addr;
2269
2270 if (is_multicast_ether_addr(hdr->addr1)) {
2271 mpp_addr = hdr->addr3;
2272 proxied_addr = mesh_hdr->eaddr1;
Johannes Berg9b395bc2012-10-26 00:36:40 +02002273 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2274 /* has_a4 already checked in ieee80211_rx_mesh_check */
Javier Cardona43b7b312009-10-15 18:10:51 -07002275 mpp_addr = hdr->addr4;
2276 proxied_addr = mesh_hdr->eaddr2;
Johannes Berg9b395bc2012-10-26 00:36:40 +02002277 } else {
2278 return RX_DROP_MONITOR;
Javier Cardona43b7b312009-10-15 18:10:51 -07002279 }
YanBo79617de2008-09-22 13:30:32 +08002280
YanBo79617de2008-09-22 13:30:32 +08002281 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +01002282 mppath = mpp_path_lookup(sdata, proxied_addr);
YanBo79617de2008-09-22 13:30:32 +08002283 if (!mppath) {
Johannes Bergbf7cd942013-02-15 14:40:31 +01002284 mpp_path_add(sdata, proxied_addr, mpp_addr);
YanBo79617de2008-09-22 13:30:32 +08002285 } else {
2286 spin_lock_bh(&mppath->state_lock);
Joe Perchesb203ca32012-05-08 18:56:52 +00002287 if (!ether_addr_equal(mppath->mpp, mpp_addr))
Javier Cardona43b7b312009-10-15 18:10:51 -07002288 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
YanBo79617de2008-09-22 13:30:32 +08002289 spin_unlock_bh(&mppath->state_lock);
2290 }
2291 rcu_read_unlock();
2292 }
2293
Javier Cardona3c5772a2009-08-10 12:15:48 -07002294 /* Frame has reached destination. Don't forward */
2295 if (!is_multicast_ether_addr(hdr->addr1) &&
Joe Perchesb203ca32012-05-08 18:56:52 +00002296 ether_addr_equal(sdata->vif.addr, hdr->addr3))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002297 return RX_CONTINUE;
2298
Yoni Divinsky00e96de2012-06-20 15:39:13 +03002299 q = ieee80211_select_queue_80211(sdata, skb, hdr);
Thomas Pedersend3c15972011-11-24 17:15:23 -08002300 if (ieee80211_queue_stopped(&local->hw, q)) {
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002301 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
Thomas Pedersend3c15972011-11-24 17:15:23 -08002302 return RX_DROP_MONITOR;
2303 }
2304 skb_set_queue_mapping(skb, q);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002305
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002306 if (!--mesh_hdr->ttl) {
2307 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
Javier Cardona2ac64cd2012-10-24 12:43:31 -07002308 goto out;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002309 }
2310
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +08002311 if (!ifmsh->mshcfg.dot11MeshForwarding)
2312 goto out;
2313
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002314 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2315 if (!fwd_skb) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02002316 net_info_ratelimited("%s: failed to clone mesh frame\n",
Joe Perchese87cc472012-05-13 21:56:26 +00002317 sdata->name);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002318 goto out;
2319 }
2320
2321 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
Thomas Pedersen9d6d6f42013-04-08 11:06:12 -07002322 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002323 info = IEEE80211_SKB_CB(fwd_skb);
2324 memset(info, 0, sizeof(*info));
2325 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2326 info->control.vif = &rx->sdata->vif;
2327 info->control.jiffies = jiffies;
2328 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2329 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2330 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
Marco Porsch3f52b7e2013-01-30 18:14:08 +01002331 /* update power mode indication when forwarding */
2332 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
Johannes Bergbf7cd942013-02-15 14:40:31 +01002333 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
Marco Porsch3f52b7e2013-01-30 18:14:08 +01002334 /* mesh power mode flags updated in mesh_nexthop_lookup */
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002335 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2336 } else {
2337 /* unable to resolve next hop */
Johannes Bergbf7cd942013-02-15 14:40:31 +01002338 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +08002339 fwd_hdr->addr3, 0,
2340 WLAN_REASON_MESH_PATH_NOFORWARD,
2341 fwd_hdr->addr2);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002342 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
Jesper Juhl74b8cc32012-01-14 21:52:17 +01002343 kfree_skb(fwd_skb);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002344 return RX_DROP_MONITOR;
2345 }
2346
2347 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2348 ieee80211_add_pending_skb(local, fwd_skb);
Johannes Bergb51aff02010-12-22 10:15:07 +01002349 out:
Johannes Bergdf140462015-04-22 14:40:58 +02002350 if (is_multicast_ether_addr(hdr->addr1))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002351 return RX_CONTINUE;
Johannes Bergdf140462015-04-22 14:40:58 +02002352 return RX_DROP_MONITOR;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002353}
Ingo Molnarbf94e172008-10-12 23:51:38 -07002354#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002355
2356static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002357ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002358{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002359 struct ieee80211_sub_if_data *sdata = rx->sdata;
Vivek Natarajane15276a2010-02-08 17:47:01 +05302360 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002361 struct net_device *dev = sdata->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07002362 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2363 __le16 fc = hdr->frame_control;
Felix Fietkau4114fa22011-04-12 19:15:22 +02002364 bool port_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002365 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002366
Harvey Harrison358c8d92008-07-15 18:44:13 -07002367 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002368 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002369
Harvey Harrison358c8d92008-07-15 18:44:13 -07002370 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002371 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002372
Johannes Berg79c892b2014-11-21 14:26:31 +01002373 if (rx->sta) {
Johannes Berg3d6dc342015-01-23 13:23:48 +01002374 /* The seqno index has the same property as needed
Johannes Berg79c892b2014-11-21 14:26:31 +01002375 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2376 * for non-QoS-data frames. Here we know it's a data
2377 * frame, so count MSDUs.
2378 */
Johannes Berg3d6dc342015-01-23 13:23:48 +01002379 rx->sta->rx_msdu[rx->seqno_idx]++;
Johannes Berg79c892b2014-11-21 14:26:31 +01002380 }
2381
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002382 /*
Johannes Berge7f4a942011-11-04 11:18:20 +01002383 * Send unexpected-4addr-frame event to hostapd. For older versions,
2384 * also drop the frame to cooked monitor interfaces.
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002385 */
2386 if (ieee80211_has_a4(hdr->frame_control) &&
Johannes Berge7f4a942011-11-04 11:18:20 +01002387 sdata->vif.type == NL80211_IFTYPE_AP) {
2388 if (rx->sta &&
2389 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2390 cfg80211_rx_unexpected_4addr_frame(
2391 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002392 return RX_DROP_MONITOR;
Johannes Berge7f4a942011-11-04 11:18:20 +01002393 }
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002394
Felix Fietkau4114fa22011-04-12 19:15:22 +02002395 err = __ieee80211_data_to_8023(rx, &port_control);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002396 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002397 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002398
Harvey Harrison358c8d92008-07-15 18:44:13 -07002399 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002400 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002401
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02002402 /* directly handle TDLS channel switch requests/responses */
2403 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2404 cpu_to_be16(ETH_P_TDLS))) {
2405 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2406
2407 if (pskb_may_pull(rx->skb,
2408 offsetof(struct ieee80211_tdls_data, u)) &&
2409 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2410 tf->category == WLAN_CATEGORY_TDLS &&
2411 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2412 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
Arik Nemtsovc8ff71e2015-07-08 15:41:45 +03002413 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2414 schedule_work(&local->tdls_chsw_work);
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02002415 if (rx->sta)
2416 rx->sta->rx_packets++;
2417
2418 return RX_QUEUED;
2419 }
2420 }
2421
Felix Fietkau4114fa22011-04-12 19:15:22 +02002422 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2423 unlikely(port_control) && sdata->bss) {
2424 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2425 u.ap);
2426 dev = sdata->dev;
2427 rx->sdata = sdata;
2428 }
2429
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002430 rx->skb->dev = dev;
2431
Helmut Schaa08ca9442010-11-30 12:19:34 +01002432 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
Rajkumar Manoharan8c99f692011-02-02 22:57:53 +05302433 !is_multicast_ether_addr(
2434 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2435 (!local->scanning &&
2436 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
Vivek Natarajane15276a2010-02-08 17:47:01 +05302437 mod_timer(&local->dynamic_ps_timer, jiffies +
2438 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2439 }
2440
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002441 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02002442
Johannes Berg9ae54c82008-01-31 19:48:20 +01002443 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002444}
2445
Johannes Berg49461622008-06-30 15:10:45 +02002446static ieee80211_rx_result debug_noinline
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002447ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
Ron Rindjunsky71364712007-12-25 17:00:36 +02002448{
Ron Rindjunsky71364712007-12-25 17:00:36 +02002449 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002450 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002451 struct tid_ampdu_rx *tid_agg_rx;
2452 u16 start_seq_num;
2453 u16 tid;
2454
Harvey Harrisona7767f92008-07-02 16:30:51 -07002455 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002456 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002457
Harvey Harrisona7767f92008-07-02 16:30:51 -07002458 if (ieee80211_is_back_req(bar->frame_control)) {
Johannes Berg8ae59772010-05-30 14:52:58 +02002459 struct {
2460 __le16 control, start_seq_num;
2461 } __packed bar_data;
Emmanuel Grumbach63822462015-04-20 22:53:37 +03002462 struct ieee80211_event event = {
2463 .type = BAR_RX_EVENT,
2464 };
Johannes Berg8ae59772010-05-30 14:52:58 +02002465
Ron Rindjunsky71364712007-12-25 17:00:36 +02002466 if (!rx->sta)
Johannes Berga02ae752009-11-16 12:00:40 +01002467 return RX_DROP_MONITOR;
Johannes Berg8ae59772010-05-30 14:52:58 +02002468
2469 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2470 &bar_data, sizeof(bar_data)))
2471 return RX_DROP_MONITOR;
2472
Johannes Berg8ae59772010-05-30 14:52:58 +02002473 tid = le16_to_cpu(bar_data.control) >> 12;
Johannes Berga87f7362010-06-10 10:21:38 +02002474
2475 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2476 if (!tid_agg_rx)
Johannes Berga02ae752009-11-16 12:00:40 +01002477 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002478
Johannes Berg8ae59772010-05-30 14:52:58 +02002479 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
Emmanuel Grumbach63822462015-04-20 22:53:37 +03002480 event.u.ba.tid = tid;
2481 event.u.ba.ssn = start_seq_num;
2482 event.u.ba.sta = &rx->sta->sta;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002483
2484 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01002485 if (tid_agg_rx->timeout)
2486 mod_timer(&tid_agg_rx->session_timer,
2487 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02002488
Johannes Bergdd318572010-11-29 11:09:16 +01002489 spin_lock(&tid_agg_rx->reorder_lock);
Johannes Berga02ae752009-11-16 12:00:40 +01002490 /* release stored frames up to start of BAR */
Johannes Bergd3b2fb52012-06-22 12:48:38 +02002491 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002492 start_seq_num, frames);
Johannes Bergdd318572010-11-29 11:09:16 +01002493 spin_unlock(&tid_agg_rx->reorder_lock);
2494
Emmanuel Grumbach63822462015-04-20 22:53:37 +03002495 drv_event_callback(rx->local, rx->sdata, &event);
2496
Johannes Berga02ae752009-11-16 12:00:40 +01002497 kfree_skb(skb);
2498 return RX_QUEUED;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002499 }
2500
Johannes Berg08daeca2010-05-30 14:53:43 +02002501 /*
2502 * After this point, we only want management frames,
2503 * so we can drop all remaining control frames to
2504 * cooked monitor interfaces.
2505 */
2506 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002507}
2508
Jouni Malinenf4f727a2009-01-10 11:46:53 +02002509static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2510 struct ieee80211_mgmt *mgmt,
2511 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02002512{
2513 struct ieee80211_local *local = sdata->local;
2514 struct sk_buff *skb;
2515 struct ieee80211_mgmt *resp;
2516
Joe Perchesb203ca32012-05-08 18:56:52 +00002517 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
Jouni Malinenfea14732009-01-08 13:32:06 +02002518 /* Not to own unicast address */
2519 return;
2520 }
2521
Joe Perchesb203ca32012-05-08 18:56:52 +00002522 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2523 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
Johannes Berg77fdaa12009-07-07 03:45:17 +02002524 /* Not from the current AP or not associated yet. */
Jouni Malinenfea14732009-01-08 13:32:06 +02002525 return;
2526 }
2527
2528 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2529 /* Too short SA Query request frame */
2530 return;
2531 }
2532
2533 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2534 if (skb == NULL)
2535 return;
2536
2537 skb_reserve(skb, local->hw.extra_tx_headroom);
2538 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2539 memset(resp, 0, 24);
2540 memcpy(resp->da, mgmt->sa, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01002541 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01002542 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02002543 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2544 IEEE80211_STYPE_ACTION);
2545 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2546 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2547 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2548 memcpy(resp->u.action.u.sa_query.trans_id,
2549 mgmt->u.action.u.sa_query.trans_id,
2550 WLAN_SA_QUERY_TR_ID_LEN);
2551
Johannes Berg62ae67b2009-11-18 18:42:05 +01002552 ieee80211_tx_skb(sdata, skb);
Jouni Malinenfea14732009-01-08 13:32:06 +02002553}
2554
Johannes Berg49461622008-06-30 15:10:45 +02002555static ieee80211_rx_result debug_noinline
Johannes Berg2e161f72010-08-12 15:38:38 +02002556ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2557{
2558 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002559 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002560
2561 /*
2562 * From here on, look only at management frames.
2563 * Data and control frames are already handled,
2564 * and unknown (reserved) frames are useless.
2565 */
2566 if (rx->skb->len < 24)
2567 return RX_DROP_MONITOR;
2568
2569 if (!ieee80211_is_mgmt(mgmt->frame_control))
2570 return RX_DROP_MONITOR;
2571
Johannes Bergee971922011-11-04 11:18:18 +01002572 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2573 ieee80211_is_beacon(mgmt->frame_control) &&
2574 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
Johannes Berg804483e2012-03-05 22:18:41 +01002575 int sig = 0;
2576
Johannes Berg30686bf2015-06-02 21:39:54 +02002577 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
Johannes Berg804483e2012-03-05 22:18:41 +01002578 sig = status->signal;
2579
Johannes Bergee971922011-11-04 11:18:18 +01002580 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2581 rx->skb->data, rx->skb->len,
Ben Greear37c73b52012-10-26 14:49:25 -07002582 status->freq, sig);
Johannes Bergee971922011-11-04 11:18:18 +01002583 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2584 }
2585
Johannes Berg2e161f72010-08-12 15:38:38 +02002586 if (ieee80211_drop_unencrypted_mgmt(rx))
2587 return RX_DROP_UNUSABLE;
2588
2589 return RX_CONTINUE;
2590}
2591
2592static ieee80211_rx_result debug_noinline
Johannes Bergde1ede72008-09-09 14:42:50 +02002593ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2594{
2595 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002596 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergde1ede72008-09-09 14:42:50 +02002597 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002598 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergde1ede72008-09-09 14:42:50 +02002599 int len = rx->skb->len;
2600
2601 if (!ieee80211_is_action(mgmt->frame_control))
2602 return RX_CONTINUE;
2603
Jouni Malinen026331c2010-02-15 12:53:10 +02002604 /* drop too small frames */
2605 if (len < IEEE80211_MIN_ACTION_SIZE)
2606 return RX_DROP_UNUSABLE;
2607
Marco Porsch815b8092012-12-05 15:04:26 -08002608 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002609 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2610 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
Johannes Berg84040802010-02-15 12:46:39 +02002611 return RX_DROP_UNUSABLE;
Johannes Bergde1ede72008-09-09 14:42:50 +02002612
Johannes Bergde1ede72008-09-09 14:42:50 +02002613 switch (mgmt->u.action.category) {
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002614 case WLAN_CATEGORY_HT:
2615 /* reject HT action frames from stations not supporting HT */
2616 if (!rx->sta->sta.ht_cap.ht_supported)
2617 goto invalid;
2618
2619 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2620 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2621 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2622 sdata->vif.type != NL80211_IFTYPE_AP &&
2623 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2624 break;
2625
Johannes Bergec61cd62012-12-28 12:12:10 +01002626 /* verify action & smps_control/chanwidth are present */
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002627 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2628 goto invalid;
2629
2630 switch (mgmt->u.action.u.ht_smps.action) {
2631 case WLAN_HT_ACTION_SMPS: {
2632 struct ieee80211_supported_band *sband;
Johannes Bergaf0ed692013-02-12 14:21:00 +01002633 enum ieee80211_smps_mode smps_mode;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002634
2635 /* convert to HT capability */
2636 switch (mgmt->u.action.u.ht_smps.smps_control) {
2637 case WLAN_HT_SMPS_CONTROL_DISABLED:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002638 smps_mode = IEEE80211_SMPS_OFF;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002639 break;
2640 case WLAN_HT_SMPS_CONTROL_STATIC:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002641 smps_mode = IEEE80211_SMPS_STATIC;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002642 break;
2643 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002644 smps_mode = IEEE80211_SMPS_DYNAMIC;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002645 break;
2646 default:
2647 goto invalid;
2648 }
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002649
2650 /* if no change do nothing */
Johannes Bergaf0ed692013-02-12 14:21:00 +01002651 if (rx->sta->sta.smps_mode == smps_mode)
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002652 goto handled;
Johannes Bergaf0ed692013-02-12 14:21:00 +01002653 rx->sta->sta.smps_mode = smps_mode;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002654
2655 sband = rx->local->hw.wiphy->bands[status->band];
2656
Johannes Berg64f68e52012-03-28 10:58:37 +02002657 rate_control_rate_update(local, sband, rx->sta,
2658 IEEE80211_RC_SMPS_CHANGED);
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002659 goto handled;
2660 }
Johannes Bergec61cd62012-12-28 12:12:10 +01002661 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2662 struct ieee80211_supported_band *sband;
2663 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
Eliad Peller1c45c5c2014-12-14 11:05:51 +02002664 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
Johannes Bergec61cd62012-12-28 12:12:10 +01002665
2666 /* If it doesn't support 40 MHz it can't change ... */
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002667 if (!(rx->sta->sta.ht_cap.cap &
2668 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
Johannes Bergec61cd62012-12-28 12:12:10 +01002669 goto handled;
2670
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002671 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
Eliad Peller1c45c5c2014-12-14 11:05:51 +02002672 max_bw = IEEE80211_STA_RX_BW_20;
Johannes Bergec61cd62012-12-28 12:12:10 +01002673 else
Eliad Peller1c45c5c2014-12-14 11:05:51 +02002674 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2675
2676 /* set cur_max_bandwidth and recalc sta bw */
2677 rx->sta->cur_max_bandwidth = max_bw;
2678 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002679
2680 if (rx->sta->sta.bandwidth == new_bw)
2681 goto handled;
Johannes Bergec61cd62012-12-28 12:12:10 +01002682
Eliad Peller1c45c5c2014-12-14 11:05:51 +02002683 rx->sta->sta.bandwidth = new_bw;
Johannes Bergec61cd62012-12-28 12:12:10 +01002684 sband = rx->local->hw.wiphy->bands[status->band];
2685
2686 rate_control_rate_update(local, sband, rx->sta,
2687 IEEE80211_RC_BW_CHANGED);
2688 goto handled;
2689 }
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002690 default:
2691 goto invalid;
2692 }
2693
2694 break;
Johannes Berg1b3a2e42013-03-26 15:17:18 +01002695 case WLAN_CATEGORY_PUBLIC:
2696 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2697 goto invalid;
2698 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2699 break;
2700 if (!rx->sta)
2701 break;
2702 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2703 break;
2704 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2705 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2706 break;
2707 if (len < offsetof(struct ieee80211_mgmt,
2708 u.action.u.ext_chan_switch.variable))
2709 goto invalid;
2710 goto queue;
Johannes Berg0af83d32012-12-27 18:55:36 +01002711 case WLAN_CATEGORY_VHT:
2712 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2713 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2714 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2715 sdata->vif.type != NL80211_IFTYPE_AP &&
2716 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2717 break;
2718
2719 /* verify action code is present */
2720 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2721 goto invalid;
2722
2723 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2724 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2725 u8 opmode;
2726
2727 /* verify opmode is present */
2728 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2729 goto invalid;
2730
2731 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2732
2733 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
Johannes Bergbee7f582013-02-07 22:24:55 +01002734 opmode, status->band,
2735 false);
Johannes Berg0af83d32012-12-27 18:55:36 +01002736 goto handled;
2737 }
2738 default:
2739 break;
2740 }
2741 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002742 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01002743 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
Thomas Pedersenae2772b2011-10-26 14:47:29 -07002744 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
Johannes Berg8abd3f92009-02-10 21:25:47 +01002745 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
Alexander Simon13c40c52011-11-30 16:56:34 +01002746 sdata->vif.type != NL80211_IFTYPE_AP &&
2747 sdata->vif.type != NL80211_IFTYPE_ADHOC)
Johannes Berg84040802010-02-15 12:46:39 +02002748 break;
Johannes Berg8abd3f92009-02-10 21:25:47 +01002749
Jouni Malinen026331c2010-02-15 12:53:10 +02002750 /* verify action_code is present */
2751 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2752 break;
2753
Johannes Bergde1ede72008-09-09 14:42:50 +02002754 switch (mgmt->u.action.u.addba_req.action_code) {
2755 case WLAN_ACTION_ADDBA_REQ:
2756 if (len < (IEEE80211_MIN_ACTION_SIZE +
2757 sizeof(mgmt->u.action.u.addba_req)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002758 goto invalid;
2759 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002760 case WLAN_ACTION_ADDBA_RESP:
2761 if (len < (IEEE80211_MIN_ACTION_SIZE +
2762 sizeof(mgmt->u.action.u.addba_resp)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002763 goto invalid;
2764 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002765 case WLAN_ACTION_DELBA:
2766 if (len < (IEEE80211_MIN_ACTION_SIZE +
2767 sizeof(mgmt->u.action.u.delba)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002768 goto invalid;
2769 break;
2770 default:
2771 goto invalid;
Johannes Bergde1ede72008-09-09 14:42:50 +02002772 }
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002773
Johannes Berg8b58ff82010-06-10 10:21:51 +02002774 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002775 case WLAN_CATEGORY_SPECTRUM_MGMT:
Jouni Malinen026331c2010-02-15 12:53:10 +02002776 /* verify action_code is present */
2777 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2778 break;
2779
Johannes Berg39192c02008-09-09 14:49:03 +02002780 switch (mgmt->u.action.u.measurement.action_code) {
2781 case WLAN_ACTION_SPCT_MSR_REQ:
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002782 if (status->band != IEEE80211_BAND_5GHZ)
2783 break;
2784
Johannes Berg39192c02008-09-09 14:49:03 +02002785 if (len < (IEEE80211_MIN_ACTION_SIZE +
2786 sizeof(mgmt->u.action.u.measurement)))
Johannes Berg84040802010-02-15 12:46:39 +02002787 break;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002788
Johannes Bergcc32abd2009-05-15 11:52:31 +02002789 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002790 break;
Johannes Bergcc32abd2009-05-15 11:52:31 +02002791
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002792 ieee80211_process_measurement_req(sdata, mgmt, len);
2793 goto handled;
2794 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2795 u8 *bssid;
2796 if (len < (IEEE80211_MIN_ACTION_SIZE +
2797 sizeof(mgmt->u.action.u.chan_switch)))
2798 break;
2799
2800 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07002801 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2802 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002803 break;
2804
2805 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2806 bssid = sdata->u.mgd.bssid;
2807 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2808 bssid = sdata->u.ibss.bssid;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07002809 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2810 bssid = mgmt->sa;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002811 else
2812 break;
2813
2814 if (!ether_addr_equal(mgmt->bssid, bssid))
Johannes Berg84040802010-02-15 12:46:39 +02002815 break;
Sujithc481ec92009-01-06 09:28:37 +05302816
Johannes Berg8b58ff82010-06-10 10:21:51 +02002817 goto queue;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002818 }
Johannes Berg39192c02008-09-09 14:49:03 +02002819 }
2820 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002821 case WLAN_CATEGORY_SA_QUERY:
2822 if (len < (IEEE80211_MIN_ACTION_SIZE +
2823 sizeof(mgmt->u.action.u.sa_query)))
Johannes Berg84040802010-02-15 12:46:39 +02002824 break;
2825
Jouni Malinenfea14732009-01-08 13:32:06 +02002826 switch (mgmt->u.action.u.sa_query.action) {
2827 case WLAN_ACTION_SA_QUERY_REQUEST:
2828 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002829 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002830 ieee80211_process_sa_query_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002831 goto handled;
Jouni Malinenfea14732009-01-08 13:32:06 +02002832 }
2833 break;
Thomas Pedersen8db09852011-08-12 20:01:00 -07002834 case WLAN_CATEGORY_SELF_PROTECTED:
Johannes Berg9b395bc2012-10-26 00:36:40 +02002835 if (len < (IEEE80211_MIN_ACTION_SIZE +
2836 sizeof(mgmt->u.action.u.self_prot.action_code)))
2837 break;
2838
Thomas Pedersen8db09852011-08-12 20:01:00 -07002839 switch (mgmt->u.action.u.self_prot.action_code) {
2840 case WLAN_SP_MESH_PEERING_OPEN:
2841 case WLAN_SP_MESH_PEERING_CLOSE:
2842 case WLAN_SP_MESH_PEERING_CONFIRM:
2843 if (!ieee80211_vif_is_mesh(&sdata->vif))
2844 goto invalid;
Thomas Pedersena6dad6a2013-03-04 13:06:12 -08002845 if (sdata->u.mesh.user_mpm)
Thomas Pedersen8db09852011-08-12 20:01:00 -07002846 /* userspace handles this frame */
2847 break;
2848 goto queue;
2849 case WLAN_SP_MGK_INFORM:
2850 case WLAN_SP_MGK_ACK:
2851 if (!ieee80211_vif_is_mesh(&sdata->vif))
2852 goto invalid;
2853 break;
2854 }
2855 break;
Javier Cardonad3aaec8a2011-05-03 16:57:09 -07002856 case WLAN_CATEGORY_MESH_ACTION:
Johannes Berg9b395bc2012-10-26 00:36:40 +02002857 if (len < (IEEE80211_MIN_ACTION_SIZE +
2858 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2859 break;
2860
Johannes Berg77a121c2010-06-10 10:21:34 +02002861 if (!ieee80211_vif_is_mesh(&sdata->vif))
2862 break;
Thomas Pedersen25d49e42011-08-11 19:35:15 -07002863 if (mesh_action_is_path_sel(mgmt) &&
Johannes Berg1df332e2012-10-26 00:09:11 +02002864 !mesh_path_sel_is_hwmp(sdata))
Javier Cardonac7108a72010-12-16 17:37:50 -08002865 break;
2866 goto queue;
Johannes Berg84040802010-02-15 12:46:39 +02002867 }
Jouni Malinen026331c2010-02-15 12:53:10 +02002868
Johannes Berg2e161f72010-08-12 15:38:38 +02002869 return RX_CONTINUE;
2870
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002871 invalid:
Johannes Berg554891e2010-09-24 12:38:25 +02002872 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
Johannes Berg2e161f72010-08-12 15:38:38 +02002873 /* will return in the next handlers */
2874 return RX_CONTINUE;
2875
2876 handled:
2877 if (rx->sta)
2878 rx->sta->rx_packets++;
2879 dev_kfree_skb(rx->skb);
2880 return RX_QUEUED;
2881
2882 queue:
2883 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2884 skb_queue_tail(&sdata->skb_queue, rx->skb);
2885 ieee80211_queue_work(&local->hw, &sdata->work);
2886 if (rx->sta)
2887 rx->sta->rx_packets++;
2888 return RX_QUEUED;
2889}
2890
2891static ieee80211_rx_result debug_noinline
2892ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2893{
Johannes Berg554891e2010-09-24 12:38:25 +02002894 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg804483e2012-03-05 22:18:41 +01002895 int sig = 0;
Johannes Berg2e161f72010-08-12 15:38:38 +02002896
2897 /* skip known-bad action frames and return them in the next handler */
Johannes Berg554891e2010-09-24 12:38:25 +02002898 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
Johannes Berg2e161f72010-08-12 15:38:38 +02002899 return RX_CONTINUE;
Felix Fietkaud7907442010-01-07 20:23:53 +01002900
Jouni Malinen026331c2010-02-15 12:53:10 +02002901 /*
2902 * Getting here means the kernel doesn't know how to handle
2903 * it, but maybe userspace does ... include returned frames
2904 * so userspace can register for those to know whether ones
2905 * it transmitted were processed or returned.
2906 */
Jouni Malinen026331c2010-02-15 12:53:10 +02002907
Johannes Berg30686bf2015-06-02 21:39:54 +02002908 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
Johannes Berg804483e2012-03-05 22:18:41 +01002909 sig = status->signal;
2910
Johannes Berg71bbc992012-06-15 15:30:18 +02002911 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
Vladimir Kondratiev970fdfa2014-08-11 03:29:57 -07002912 rx->skb->data, rx->skb->len, 0)) {
Johannes Berg2e161f72010-08-12 15:38:38 +02002913 if (rx->sta)
2914 rx->sta->rx_packets++;
2915 dev_kfree_skb(rx->skb);
2916 return RX_QUEUED;
2917 }
2918
Johannes Berg2e161f72010-08-12 15:38:38 +02002919 return RX_CONTINUE;
2920}
2921
2922static ieee80211_rx_result debug_noinline
2923ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2924{
2925 struct ieee80211_local *local = rx->local;
2926 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2927 struct sk_buff *nskb;
2928 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02002929 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002930
2931 if (!ieee80211_is_action(mgmt->frame_control))
2932 return RX_CONTINUE;
2933
2934 /*
2935 * For AP mode, hostapd is responsible for handling any action
2936 * frames that we didn't handle, including returning unknown
2937 * ones. For all other modes we will return them to the sender,
2938 * setting the 0x80 bit in the action category, as required by
Johannes Berg4b5ebcc2012-06-27 15:38:56 +02002939 * 802.11-2012 9.24.4.
Johannes Berg2e161f72010-08-12 15:38:38 +02002940 * Newer versions of hostapd shall also use the management frame
2941 * registration mechanisms, but older ones still use cooked
2942 * monitor interfaces so push all frames there.
2943 */
Johannes Berg554891e2010-09-24 12:38:25 +02002944 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
Johannes Berg2e161f72010-08-12 15:38:38 +02002945 (sdata->vif.type == NL80211_IFTYPE_AP ||
2946 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2947 return RX_DROP_MONITOR;
Jouni Malinen026331c2010-02-15 12:53:10 +02002948
Johannes Berg4b5ebcc2012-06-27 15:38:56 +02002949 if (is_multicast_ether_addr(mgmt->da))
2950 return RX_DROP_MONITOR;
2951
Johannes Berg84040802010-02-15 12:46:39 +02002952 /* do not return rejected action frames */
2953 if (mgmt->u.action.category & 0x80)
2954 return RX_DROP_UNUSABLE;
2955
2956 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2957 GFP_ATOMIC);
2958 if (nskb) {
John W. Linville292b4df2010-06-24 11:13:56 -04002959 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
Johannes Berg84040802010-02-15 12:46:39 +02002960
John W. Linville292b4df2010-06-24 11:13:56 -04002961 nmgmt->u.action.category |= 0x80;
2962 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2963 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
Johannes Berg84040802010-02-15 12:46:39 +02002964
2965 memset(nskb->cb, 0, sizeof(nskb->cb));
2966
Johannes Berg07e5a5f2013-03-07 13:22:05 +01002967 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2968 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2969
2970 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2971 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2972 IEEE80211_TX_CTL_NO_CCK_RATE;
Johannes Berg30686bf2015-06-02 21:39:54 +02002973 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
Johannes Berg07e5a5f2013-03-07 13:22:05 +01002974 info->hw_queue =
2975 local->hw.offchannel_tx_hw_queue;
2976 }
2977
2978 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2979 status->band);
Johannes Bergde1ede72008-09-09 14:42:50 +02002980 }
Johannes Berg39192c02008-09-09 14:49:03 +02002981 dev_kfree_skb(rx->skb);
2982 return RX_QUEUED;
Johannes Bergde1ede72008-09-09 14:42:50 +02002983}
2984
2985static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002986ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02002987{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002988 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg77a121c2010-06-10 10:21:34 +02002989 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2990 __le16 stype;
Johannes Berg571ecf62007-07-27 15:43:22 +02002991
Johannes Berg77a121c2010-06-10 10:21:34 +02002992 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
Johannes Berg472dbc42008-09-11 00:01:49 +02002993
Johannes Berg77a121c2010-06-10 10:21:34 +02002994 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2995 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Rostislav Lisovy239281f2014-11-03 10:33:19 +01002996 sdata->vif.type != NL80211_IFTYPE_OCB &&
Johannes Berg77a121c2010-06-10 10:21:34 +02002997 sdata->vif.type != NL80211_IFTYPE_STATION)
2998 return RX_DROP_MONITOR;
Johannes Bergf9d540e2007-09-28 14:02:09 +02002999
Johannes Berg77a121c2010-06-10 10:21:34 +02003000 switch (stype) {
Johannes Berg66e67e42012-01-20 13:55:27 +01003001 case cpu_to_le16(IEEE80211_STYPE_AUTH):
Johannes Berg77a121c2010-06-10 10:21:34 +02003002 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3003 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3004 /* process for all: mesh, mlme, ibss */
3005 break;
Johannes Berg66e67e42012-01-20 13:55:27 +01003006 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3007 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
Johannes Berg77a121c2010-06-10 10:21:34 +02003008 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3009 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
Christian Lamparter2c313332010-11-29 20:53:23 +01003010 if (is_multicast_ether_addr(mgmt->da) &&
3011 !is_broadcast_ether_addr(mgmt->da))
3012 return RX_DROP_MONITOR;
3013
Johannes Berg77a121c2010-06-10 10:21:34 +02003014 /* process only for station */
3015 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3016 return RX_DROP_MONITOR;
3017 break;
3018 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08003019 /* process only for ibss and mesh */
3020 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3021 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
Johannes Berg77a121c2010-06-10 10:21:34 +02003022 return RX_DROP_MONITOR;
3023 break;
3024 default:
3025 return RX_DROP_MONITOR;
3026 }
Johannes Berg46900292009-02-15 12:44:28 +01003027
Johannes Berg77a121c2010-06-10 10:21:34 +02003028 /* queue up frame and kick off work to process it */
Johannes Bergc1475ca2010-06-10 10:21:37 +02003029 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg77a121c2010-06-10 10:21:34 +02003030 skb_queue_tail(&sdata->skb_queue, rx->skb);
3031 ieee80211_queue_work(&rx->local->hw, &sdata->work);
Johannes Berg8b58ff82010-06-10 10:21:51 +02003032 if (rx->sta)
3033 rx->sta->rx_packets++;
Johannes Berg77a121c2010-06-10 10:21:34 +02003034
3035 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02003036}
3037
Johannes Berg5f0b7de2009-11-16 13:58:21 +01003038static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3039 struct ieee80211_rate *rate)
Michael Wu3d30d942008-01-31 19:48:27 +01003040{
3041 struct ieee80211_sub_if_data *sdata;
3042 struct ieee80211_local *local = rx->local;
Michael Wu3d30d942008-01-31 19:48:27 +01003043 struct sk_buff *skb = rx->skb, *skb2;
3044 struct net_device *prev_dev = NULL;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003045 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg293702a2012-03-02 13:18:19 +01003046 int needed_headroom;
Michael Wu3d30d942008-01-31 19:48:27 +01003047
Johannes Berg554891e2010-09-24 12:38:25 +02003048 /*
3049 * If cooked monitor has been processed already, then
3050 * don't do it again. If not, set the flag.
3051 */
3052 if (rx->flags & IEEE80211_RX_CMNTR)
John W. Linville7c1e1832010-09-24 15:52:49 -04003053 goto out_free_skb;
Johannes Berg554891e2010-09-24 12:38:25 +02003054 rx->flags |= IEEE80211_RX_CMNTR;
John W. Linville7c1e1832010-09-24 15:52:49 -04003055
Johannes Berg152c4772011-10-21 10:22:22 +02003056 /* If there are no cooked monitor interfaces, just free the SKB */
3057 if (!local->cooked_mntrs)
3058 goto out_free_skb;
3059
Johannes Berg1f7bba72014-11-06 22:56:36 +01003060 /* vendor data is long removed here */
3061 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
Johannes Berg293702a2012-03-02 13:18:19 +01003062 /* room for the radiotap header based on driver features */
Johannes Berg1f7bba72014-11-06 22:56:36 +01003063 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
Johannes Berg293702a2012-03-02 13:18:19 +01003064
3065 if (skb_headroom(skb) < needed_headroom &&
3066 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
Michael Wu3d30d942008-01-31 19:48:27 +01003067 goto out_free_skb;
3068
Johannes Berg293702a2012-03-02 13:18:19 +01003069 /* prepend radiotap information */
Felix Fietkau973ef212012-04-16 14:56:48 +02003070 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3071 false);
Michael Wu3d30d942008-01-31 19:48:27 +01003072
3073 skb_set_mac_header(skb, 0);
3074 skb->ip_summed = CHECKSUM_UNNECESSARY;
3075 skb->pkt_type = PACKET_OTHERHOST;
3076 skb->protocol = htons(ETH_P_802_2);
3077
3078 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01003079 if (!ieee80211_sdata_running(sdata))
Michael Wu3d30d942008-01-31 19:48:27 +01003080 continue;
3081
Johannes Berg05c914f2008-09-11 00:01:58 +02003082 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Michael Wu3d30d942008-01-31 19:48:27 +01003083 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3084 continue;
3085
3086 if (prev_dev) {
3087 skb2 = skb_clone(skb, GFP_ATOMIC);
3088 if (skb2) {
3089 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04003090 netif_receive_skb(skb2);
Michael Wu3d30d942008-01-31 19:48:27 +01003091 }
3092 }
3093
3094 prev_dev = sdata->dev;
Johannes Berg5a490512015-04-22 17:10:38 +02003095 ieee80211_rx_stats(sdata->dev, skb->len);
Michael Wu3d30d942008-01-31 19:48:27 +01003096 }
3097
3098 if (prev_dev) {
3099 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04003100 netif_receive_skb(skb);
Johannes Berg554891e2010-09-24 12:38:25 +02003101 return;
3102 }
Michael Wu3d30d942008-01-31 19:48:27 +01003103
3104 out_free_skb:
3105 dev_kfree_skb(skb);
3106}
3107
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003108static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3109 ieee80211_rx_result res)
3110{
3111 switch (res) {
3112 case RX_DROP_MONITOR:
3113 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3114 if (rx->sta)
3115 rx->sta->rx_dropped++;
3116 /* fall through */
3117 case RX_CONTINUE: {
3118 struct ieee80211_rate *rate = NULL;
3119 struct ieee80211_supported_band *sband;
3120 struct ieee80211_rx_status *status;
3121
3122 status = IEEE80211_SKB_RXCB((rx->skb));
3123
3124 sband = rx->local->hw.wiphy->bands[status->band];
Johannes Berg56146182012-11-09 15:07:02 +01003125 if (!(status->flag & RX_FLAG_HT) &&
3126 !(status->flag & RX_FLAG_VHT))
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003127 rate = &sband->bitrates[status->rate_idx];
3128
3129 ieee80211_rx_cooked_monitor(rx, rate);
3130 break;
3131 }
3132 case RX_DROP_UNUSABLE:
3133 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3134 if (rx->sta)
3135 rx->sta->rx_dropped++;
3136 dev_kfree_skb(rx->skb);
3137 break;
3138 case RX_QUEUED:
3139 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3140 break;
3141 }
3142}
3143
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003144static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3145 struct sk_buff_head *frames)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003146{
3147 ieee80211_rx_result res = RX_DROP_MONITOR;
3148 struct sk_buff *skb;
3149
3150#define CALL_RXH(rxh) \
3151 do { \
3152 res = rxh(rx); \
3153 if (res != RX_CONTINUE) \
3154 goto rxh_next; \
3155 } while (0);
3156
Johannes Berg45ceeee2015-03-16 09:08:20 +01003157 /* Lock here to avoid hitting all of the data used in the RX
3158 * path (e.g. key data, station data, ...) concurrently when
3159 * a frame is released from the reorder buffer due to timeout
3160 * from the timer, potentially concurrently with RX from the
3161 * driver.
3162 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003163 spin_lock_bh(&rx->local->rx_path_lock);
Christian Lamparter24a8fda2010-12-30 17:25:29 +01003164
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003165 while ((skb = __skb_dequeue(frames))) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003166 /*
3167 * all the other fields are valid across frames
3168 * that belong to an aMPDU since they are on the
3169 * same TID from the same station
3170 */
3171 rx->skb = skb;
3172
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003173 CALL_RXH(ieee80211_rx_h_check_more_data)
Johannes Berg47086fc2011-09-29 16:04:33 +02003174 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003175 CALL_RXH(ieee80211_rx_h_sta_process)
Johan Almbladh86c228a2013-08-14 15:29:46 +02003176 CALL_RXH(ieee80211_rx_h_decrypt)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003177 CALL_RXH(ieee80211_rx_h_defragment)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003178 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3179 /* must be after MMIC verify so header is counted in MPDU mic */
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003180#ifdef CONFIG_MAC80211_MESH
3181 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3182 CALL_RXH(ieee80211_rx_h_mesh_fwding);
3183#endif
Javier Cardona2154c812011-09-07 17:49:53 -07003184 CALL_RXH(ieee80211_rx_h_amsdu)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003185 CALL_RXH(ieee80211_rx_h_data)
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003186
3187 /* special treatment -- needs the queue */
3188 res = ieee80211_rx_h_ctrl(rx, frames);
3189 if (res != RX_CONTINUE)
3190 goto rxh_next;
3191
Johannes Berg2e161f72010-08-12 15:38:38 +02003192 CALL_RXH(ieee80211_rx_h_mgmt_check)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003193 CALL_RXH(ieee80211_rx_h_action)
Johannes Berg2e161f72010-08-12 15:38:38 +02003194 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3195 CALL_RXH(ieee80211_rx_h_action_return)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003196 CALL_RXH(ieee80211_rx_h_mgmt)
3197
3198 rxh_next:
3199 ieee80211_rx_handlers_result(rx, res);
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003200
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003201#undef CALL_RXH
3202 }
Christian Lamparter24a8fda2010-12-30 17:25:29 +01003203
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003204 spin_unlock_bh(&rx->local->rx_path_lock);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003205}
Johannes Berg571ecf62007-07-27 15:43:22 +02003206
Johannes Berg4406c372010-09-24 11:21:06 +02003207static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
Johannes Berg58905292008-01-31 19:48:25 +01003208{
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003209 struct sk_buff_head reorder_release;
Johannes Berg58905292008-01-31 19:48:25 +01003210 ieee80211_rx_result res = RX_DROP_MONITOR;
3211
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003212 __skb_queue_head_init(&reorder_release);
3213
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02003214#define CALL_RXH(rxh) \
3215 do { \
3216 res = rxh(rx); \
3217 if (res != RX_CONTINUE) \
Johannes Berg2569a822009-11-25 17:46:17 +01003218 goto rxh_next; \
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02003219 } while (0);
Johannes Berg58905292008-01-31 19:48:25 +01003220
Johannes Berg03954422014-11-11 16:49:25 +01003221 CALL_RXH(ieee80211_rx_h_check_dup)
Johannes Berg49461622008-06-30 15:10:45 +02003222 CALL_RXH(ieee80211_rx_h_check)
Johannes Berg2569a822009-11-25 17:46:17 +01003223
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003224 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
Johannes Berg2569a822009-11-25 17:46:17 +01003225
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003226 ieee80211_rx_handlers(rx, &reorder_release);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003227 return;
Johannes Berg49461622008-06-30 15:10:45 +02003228
Johannes Berg2569a822009-11-25 17:46:17 +01003229 rxh_next:
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003230 ieee80211_rx_handlers_result(rx, res);
3231
3232#undef CALL_RXH
Johannes Berg58905292008-01-31 19:48:25 +01003233}
3234
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003235/*
Johannes Bergdd318572010-11-29 11:09:16 +01003236 * This function makes calls into the RX path, therefore
3237 * it has to be invoked under RCU read lock.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003238 */
3239void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3240{
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003241 struct sk_buff_head frames;
Johannes Berg554891e2010-09-24 12:38:25 +02003242 struct ieee80211_rx_data rx = {
3243 .sta = sta,
3244 .sdata = sta->sdata,
3245 .local = sta->local,
Johannes Berg9e262972011-07-07 18:45:03 +02003246 /* This is OK -- must be QoS data frame */
3247 .security_idx = tid,
3248 .seqno_idx = tid,
Johannes Bergaf9f9b22015-06-11 16:02:32 +02003249 .napi = NULL, /* must be NULL to not have races */
Johannes Berg554891e2010-09-24 12:38:25 +02003250 };
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003251 struct tid_ampdu_rx *tid_agg_rx;
3252
3253 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3254 if (!tid_agg_rx)
3255 return;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003256
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003257 __skb_queue_head_init(&frames);
3258
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003259 spin_lock(&tid_agg_rx->reorder_lock);
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003260 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003261 spin_unlock(&tid_agg_rx->reorder_lock);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003262
Emmanuel Grumbachb497de62015-04-20 22:53:38 +03003263 if (!skb_queue_empty(&frames)) {
3264 struct ieee80211_event event = {
3265 .type = BA_FRAME_TIMEOUT,
3266 .u.ba.tid = tid,
3267 .u.ba.sta = &sta->sta,
3268 };
3269 drv_event_callback(rx.local, rx.sdata, &event);
3270 }
3271
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003272 ieee80211_rx_handlers(&rx, &frames);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003273}
3274
Johannes Berg571ecf62007-07-27 15:43:22 +02003275/* main receive path */
3276
Johannes Berga58fbe12015-04-22 15:08:39 +02003277static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
Johannes Berg23a24de2007-07-27 15:43:22 +02003278{
Johannes Berg20b01f82010-09-24 11:21:05 +02003279 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003280 struct sk_buff *skb = rx->skb;
Johannes Berga58fbe12015-04-22 15:08:39 +02003281 struct ieee80211_hdr *hdr = (void *)skb->data;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003282 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3283 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02003284 int multicast = is_multicast_ether_addr(hdr->addr1);
3285
Johannes Berg51fb61e2007-12-19 01:31:27 +01003286 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02003287 case NL80211_IFTYPE_STATION:
Johannes Berg9bc383d2009-11-19 11:55:19 +01003288 if (!bssid && !sdata->u.mgd.use_4addr)
Johannes Berg3c2723f52014-01-07 16:23:24 +01003289 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003290 if (multicast)
3291 return true;
3292 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
Johannes Berg05c914f2008-09-11 00:01:58 +02003293 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02003294 if (!bssid)
Johannes Berg3c2723f52014-01-07 16:23:24 +01003295 return false;
Felix Fietkau6329b8d2013-09-17 11:15:43 +02003296 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3297 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003298 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003299 if (ieee80211_is_beacon(hdr->frame_control))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003300 return true;
Johannes Berga58fbe12015-04-22 15:08:39 +02003301 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003302 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003303 if (!multicast &&
3304 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
Johannes Bergdf140462015-04-22 14:40:58 +02003305 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003306 if (!rx->sta) {
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003307 int rate_idx;
Johannes Berg56146182012-11-09 15:07:02 +01003308 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3309 rate_idx = 0; /* TODO: HT/VHT rates */
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003310 else
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003311 rate_idx = status->rate_idx;
Johannes Berg8bf11d82011-12-15 11:17:37 +01003312 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3313 BIT(rate_idx));
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003314 }
Johannes Berga58fbe12015-04-22 15:08:39 +02003315 return true;
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003316 case NL80211_IFTYPE_OCB:
3317 if (!bssid)
3318 return false;
Bertold Van den Berghcc117292015-08-05 16:02:42 +02003319 if (!ieee80211_is_data_present(hdr->frame_control))
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003320 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003321 if (!is_broadcast_ether_addr(bssid))
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003322 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003323 if (!multicast &&
3324 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
Johannes Bergdf140462015-04-22 14:40:58 +02003325 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003326 if (!rx->sta) {
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003327 int rate_idx;
3328 if (status->flag & RX_FLAG_HT)
3329 rate_idx = 0; /* TODO: HT rates */
3330 else
3331 rate_idx = status->rate_idx;
3332 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3333 BIT(rate_idx));
3334 }
Johannes Berga58fbe12015-04-22 15:08:39 +02003335 return true;
Johannes Berg05c914f2008-09-11 00:01:58 +02003336 case NL80211_IFTYPE_MESH_POINT:
Johannes Berga58fbe12015-04-22 15:08:39 +02003337 if (multicast)
3338 return true;
3339 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
Johannes Berg05c914f2008-09-11 00:01:58 +02003340 case NL80211_IFTYPE_AP_VLAN:
3341 case NL80211_IFTYPE_AP:
Johannes Berga58fbe12015-04-22 15:08:39 +02003342 if (!bssid)
3343 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3344
3345 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
Johannes Berg3df6eae2011-12-06 10:39:40 +01003346 /*
3347 * Accept public action frames even when the
3348 * BSSID doesn't match, this is used for P2P
3349 * and location updates. Note that mac80211
3350 * itself never looks at these frames.
3351 */
Johannes Berg2b9ccd42013-05-13 16:42:40 +02003352 if (!multicast &&
3353 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003354 return false;
Johannes Bergd48b2962012-07-06 22:19:27 +02003355 if (ieee80211_is_public_action(hdr, skb->len))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003356 return true;
Johannes Berg5c900672015-04-22 14:48:34 +02003357 return ieee80211_is_beacon(hdr->frame_control);
Johannes Berga58fbe12015-04-22 15:08:39 +02003358 }
3359
3360 if (!ieee80211_has_tods(hdr->frame_control)) {
Arik Nemtsovdb8e1732014-07-17 17:14:30 +03003361 /* ignore data frames to TDLS-peers */
3362 if (ieee80211_is_data(hdr->frame_control))
3363 return false;
3364 /* ignore action frames to TDLS-peers */
3365 if (ieee80211_is_action(hdr->frame_control) &&
3366 !ether_addr_equal(bssid, hdr->addr1))
3367 return false;
Johannes Berg23a24de2007-07-27 15:43:22 +02003368 }
Johannes Berga58fbe12015-04-22 15:08:39 +02003369 return true;
Johannes Berg05c914f2008-09-11 00:01:58 +02003370 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07003371 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003372 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003373 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
Johannes Bergf142c6b2012-06-18 20:07:15 +02003374 case NL80211_IFTYPE_P2P_DEVICE:
Johannes Berga58fbe12015-04-22 15:08:39 +02003375 return ieee80211_is_public_action(hdr, skb->len) ||
3376 ieee80211_is_probe_req(hdr->frame_control) ||
3377 ieee80211_is_probe_resp(hdr->frame_control) ||
3378 ieee80211_is_beacon(hdr->frame_control);
Johannes Berg2ca27bc2010-09-16 14:58:23 +02003379 default:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02003380 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02003381 }
3382
Johannes Berga58fbe12015-04-22 15:08:39 +02003383 WARN_ON_ONCE(1);
3384 return false;
Johannes Berg23a24de2007-07-27 15:43:22 +02003385}
3386
Johannes Berg571ecf62007-07-27 15:43:22 +02003387/*
Johannes Berg4406c372010-09-24 11:21:06 +02003388 * This function returns whether or not the SKB
3389 * was destined for RX processing or not, which,
3390 * if consume is true, is equivalent to whether
3391 * or not the skb was consumed.
3392 */
3393static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3394 struct sk_buff *skb, bool consume)
3395{
3396 struct ieee80211_local *local = rx->local;
3397 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg4406c372010-09-24 11:21:06 +02003398
3399 rx->skb = skb;
Johannes Berg4406c372010-09-24 11:21:06 +02003400
Johannes Berga58fbe12015-04-22 15:08:39 +02003401 if (!ieee80211_accept_frame(rx))
Johannes Berg4406c372010-09-24 11:21:06 +02003402 return false;
3403
Johannes Berg4406c372010-09-24 11:21:06 +02003404 if (!consume) {
3405 skb = skb_copy(skb, GFP_ATOMIC);
3406 if (!skb) {
3407 if (net_ratelimit())
3408 wiphy_debug(local->hw.wiphy,
Ben Greearb305dae2011-01-08 10:30:54 -08003409 "failed to copy skb for %s\n",
Johannes Berg4406c372010-09-24 11:21:06 +02003410 sdata->name);
3411 return true;
3412 }
3413
3414 rx->skb = skb;
3415 }
3416
3417 ieee80211_invoke_rx_handlers(rx);
3418 return true;
3419}
3420
3421/*
Zhao, Gang6b59db72014-04-21 12:52:59 +08003422 * This is the actual Rx frames handler. as it belongs to Rx path it must
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003423 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02003424 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02003425static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
Johannes Bergaf9f9b22015-06-11 16:02:32 +02003426 struct sk_buff *skb,
3427 struct napi_struct *napi)
Johannes Berg571ecf62007-07-27 15:43:22 +02003428{
3429 struct ieee80211_local *local = hw_to_local(hw);
3430 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02003431 struct ieee80211_hdr *hdr;
Zhu Yie3cf8b32010-03-29 17:35:07 +08003432 __le16 fc;
Johannes Berg5cf121c2008-02-25 16:27:43 +01003433 struct ieee80211_rx_data rx;
Johannes Berg4406c372010-09-24 11:21:06 +02003434 struct ieee80211_sub_if_data *prev;
Johannes Berg7bedd0c2015-02-13 21:55:15 +01003435 struct sta_info *sta, *prev_sta;
3436 struct rhash_head *tmp;
Zhu Yie3cf8b32010-03-29 17:35:07 +08003437 int err = 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02003438
Zhu Yie3cf8b32010-03-29 17:35:07 +08003439 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02003440 memset(&rx, 0, sizeof(rx));
3441 rx.skb = skb;
3442 rx.local = local;
Johannes Bergaf9f9b22015-06-11 16:02:32 +02003443 rx.napi = napi;
Johannes Berg72abd812007-09-17 01:29:22 -04003444
Zhu Yie3cf8b32010-03-29 17:35:07 +08003445 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
Johannes Bergc206ca62015-04-22 20:47:28 +02003446 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
Johannes Berg571ecf62007-07-27 15:43:22 +02003447
Johannes Berg4a4f1a52012-10-26 00:33:36 +02003448 if (ieee80211_is_mgmt(fc)) {
3449 /* drop frame if too short for header */
3450 if (skb->len < ieee80211_hdrlen(fc))
3451 err = -ENOBUFS;
3452 else
3453 err = skb_linearize(skb);
3454 } else {
Zhu Yie3cf8b32010-03-29 17:35:07 +08003455 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
Johannes Berg4a4f1a52012-10-26 00:33:36 +02003456 }
Zhu Yie3cf8b32010-03-29 17:35:07 +08003457
3458 if (err) {
3459 dev_kfree_skb(skb);
3460 return;
3461 }
3462
3463 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg38f37142008-01-29 17:07:43 +01003464 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01003465 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01003466
Johannes Bergd48b2962012-07-06 22:19:27 +02003467 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3468 ieee80211_is_beacon(hdr->frame_control)))
3469 ieee80211_scan_rx(local, skb);
3470
Zhu Yie3cf8b32010-03-29 17:35:07 +08003471 if (ieee80211_is_data(fc)) {
Johannes Berg7bedd0c2015-02-13 21:55:15 +01003472 const struct bucket_table *tbl;
3473
Ben Greear56af3262010-09-23 10:22:24 -07003474 prev_sta = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02003475
Johannes Berg7bedd0c2015-02-13 21:55:15 +01003476 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
3477
3478 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) {
Ben Greear56af3262010-09-23 10:22:24 -07003479 if (!prev_sta) {
3480 prev_sta = sta;
3481 continue;
3482 }
3483
3484 rx.sta = prev_sta;
3485 rx.sdata = prev_sta->sdata;
Johannes Berg4406c372010-09-24 11:21:06 +02003486 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Johannes Berg571ecf62007-07-27 15:43:22 +02003487
Ben Greear56af3262010-09-23 10:22:24 -07003488 prev_sta = sta;
Johannes Berg4406c372010-09-24 11:21:06 +02003489 }
Ben Greear56af3262010-09-23 10:22:24 -07003490
3491 if (prev_sta) {
3492 rx.sta = prev_sta;
3493 rx.sdata = prev_sta->sdata;
3494
Johannes Berg4406c372010-09-24 11:21:06 +02003495 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
Ben Greear56af3262010-09-23 10:22:24 -07003496 return;
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05303497 goto out;
Ben Greear56af3262010-09-23 10:22:24 -07003498 }
Johannes Berg4406c372010-09-24 11:21:06 +02003499 }
3500
Johannes Berg4b0dd982010-09-24 11:21:07 +02003501 prev = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02003502
Johannes Berg4b0dd982010-09-24 11:21:07 +02003503 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3504 if (!ieee80211_sdata_running(sdata))
3505 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01003506
Johannes Berg4b0dd982010-09-24 11:21:07 +02003507 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3508 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3509 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01003510
Johannes Berg4b0dd982010-09-24 11:21:07 +02003511 /*
3512 * frame is destined for this interface, but if it's
3513 * not also for the previous one we handle that after
3514 * the loop to avoid copying the SKB once too much
3515 */
Johannes Bergb2e77712007-09-26 15:19:39 +02003516
Johannes Berg4b0dd982010-09-24 11:21:07 +02003517 if (!prev) {
Johannes Berg340e11f2007-07-27 15:43:22 +02003518 prev = sdata;
Johannes Berg4b0dd982010-09-24 11:21:07 +02003519 continue;
Johannes Berg8e6f00322007-07-27 15:43:22 +02003520 }
Felix Fietkau4bb29f82010-01-22 00:36:39 +01003521
Johannes Berg7852e362012-01-20 13:55:24 +01003522 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Johannes Berg4b0dd982010-09-24 11:21:07 +02003523 rx.sdata = prev;
3524 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01003525
Johannes Berg4b0dd982010-09-24 11:21:07 +02003526 prev = sdata;
3527 }
Johannes Berg4406c372010-09-24 11:21:06 +02003528
Johannes Berg4b0dd982010-09-24 11:21:07 +02003529 if (prev) {
Johannes Berg7852e362012-01-20 13:55:24 +01003530 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Johannes Berg4b0dd982010-09-24 11:21:07 +02003531 rx.sdata = prev;
3532
3533 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3534 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02003535 }
Johannes Berg4406c372010-09-24 11:21:06 +02003536
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05303537 out:
Johannes Berg4406c372010-09-24 11:21:06 +02003538 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02003539}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003540
3541/*
3542 * This is the receive path handler. It is called by a low level driver when an
3543 * 802.11 MPDU is received from the hardware.
3544 */
Johannes Bergaf9f9b22015-06-11 16:02:32 +02003545void ieee80211_rx_napi(struct ieee80211_hw *hw, struct sk_buff *skb,
3546 struct napi_struct *napi)
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003547{
3548 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01003549 struct ieee80211_rate *rate = NULL;
3550 struct ieee80211_supported_band *sband;
Johannes Bergf1d58c22009-06-17 13:13:00 +02003551 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg8318d782008-01-24 19:38:38 +01003552
Johannes Bergd20ef632009-10-11 15:10:40 +02003553 WARN_ON_ONCE(softirq_count() == 0);
3554
Johannes Berg444e38032012-09-30 17:08:35 +02003555 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
Johannes Berg77a980d2009-08-24 11:46:30 +02003556 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01003557
3558 sband = local->hw.wiphy->bands[status->band];
Johannes Berg77a980d2009-08-24 11:46:30 +02003559 if (WARN_ON(!sband))
3560 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01003561
Johannes Berg89c3a8a2009-07-28 18:10:17 +02003562 /*
3563 * If we're suspending, it is possible although not too likely
3564 * that we'd be receiving frames after having already partially
3565 * quiesced the stack. We can't process such frames then since
3566 * that might, for example, cause stations to be added or other
3567 * driver callbacks be invoked.
3568 */
Johannes Berg77a980d2009-08-24 11:46:30 +02003569 if (unlikely(local->quiescing || local->suspended))
3570 goto drop;
Johannes Berg89c3a8a2009-07-28 18:10:17 +02003571
Arik Nemtsov04800ad2012-06-06 11:25:02 +03003572 /* We might be during a HW reconfig, prevent Rx for the same reason */
3573 if (unlikely(local->in_reconfig))
3574 goto drop;
3575
Johannes Bergea77f122009-08-21 14:44:45 +02003576 /*
3577 * The same happens when we're not even started,
3578 * but that's worth a warning.
3579 */
Johannes Berg77a980d2009-08-24 11:46:30 +02003580 if (WARN_ON(!local->started))
3581 goto drop;
Johannes Bergea77f122009-08-21 14:44:45 +02003582
Johannes Bergfc885182010-07-30 13:23:12 +02003583 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05003584 /*
Johannes Bergfc885182010-07-30 13:23:12 +02003585 * Validate the rate, unless a PLCP error means that
3586 * we probably can't have a valid rate here anyway.
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05003587 */
Johannes Bergfc885182010-07-30 13:23:12 +02003588
3589 if (status->flag & RX_FLAG_HT) {
3590 /*
3591 * rate_idx is MCS index, which can be [0-76]
3592 * as documented on:
3593 *
3594 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3595 *
3596 * Anything else would be some sort of driver or
3597 * hardware error. The driver should catch hardware
3598 * errors.
3599 */
Johannes Berg444e38032012-09-30 17:08:35 +02003600 if (WARN(status->rate_idx > 76,
Johannes Bergfc885182010-07-30 13:23:12 +02003601 "Rate marked as an HT rate but passed "
3602 "status->rate_idx is not "
3603 "an MCS index [0-76]: %d (0x%02x)\n",
3604 status->rate_idx,
3605 status->rate_idx))
3606 goto drop;
Johannes Berg56146182012-11-09 15:07:02 +01003607 } else if (status->flag & RX_FLAG_VHT) {
3608 if (WARN_ONCE(status->rate_idx > 9 ||
3609 !status->vht_nss ||
3610 status->vht_nss > 8,
3611 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3612 status->rate_idx, status->vht_nss))
3613 goto drop;
Johannes Bergfc885182010-07-30 13:23:12 +02003614 } else {
Johannes Berg444e38032012-09-30 17:08:35 +02003615 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
Johannes Bergfc885182010-07-30 13:23:12 +02003616 goto drop;
3617 rate = &sband->bitrates[status->rate_idx];
3618 }
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003619 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003620
Johannes Berg554891e2010-09-24 12:38:25 +02003621 status->rx_flags = 0;
3622
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003623 /*
3624 * key references and virtual interfaces are protected using RCU
3625 * and this requires that we are in a read-side RCU section during
3626 * receive processing
3627 */
3628 rcu_read_lock();
3629
3630 /*
3631 * Frames with failed FCS/PLCP checksum are not returned,
3632 * all other frames are returned without radiotap header
3633 * if it was previously present.
3634 * Also, frames with less than 16 bytes are dropped.
3635 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02003636 skb = ieee80211_rx_monitor(local, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003637 if (!skb) {
3638 rcu_read_unlock();
3639 return;
3640 }
3641
Johannes Berge1e54062010-11-30 08:58:45 +01003642 ieee80211_tpt_led_trig_rx(local,
3643 ((struct ieee80211_hdr *)skb->data)->frame_control,
3644 skb->len);
Johannes Bergaf9f9b22015-06-11 16:02:32 +02003645 __ieee80211_rx_handle_packet(hw, skb, napi);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003646
3647 rcu_read_unlock();
Johannes Berg77a980d2009-08-24 11:46:30 +02003648
3649 return;
3650 drop:
3651 kfree_skb(skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003652}
Johannes Bergaf9f9b22015-06-11 16:02:32 +02003653EXPORT_SYMBOL(ieee80211_rx_napi);
Johannes Berg571ecf62007-07-27 15:43:22 +02003654
3655/* This is a version of the rx handler that can be called from hard irq
3656 * context. Post the skb on the queue and schedule the tasklet */
Johannes Bergf1d58c22009-06-17 13:13:00 +02003657void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02003658{
3659 struct ieee80211_local *local = hw_to_local(hw);
3660
3661 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3662
Johannes Berg571ecf62007-07-27 15:43:22 +02003663 skb->pkt_type = IEEE80211_RX_MSG;
3664 skb_queue_tail(&local->skb_queue, skb);
3665 tasklet_schedule(&local->tasklet);
3666}
3667EXPORT_SYMBOL(ieee80211_rx_irqsafe);