blob: 74652eb2f90fd5f2226a666940d1abc7bdba501d [file] [log] [blame]
Johannes Berg571ecf62007-07-27 15:43:22 +02001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
Johannes Berg84040802010-02-15 12:46:39 +02005 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
Johannes Bergd98ad832014-09-03 15:24:57 +03006 * Copyright 2013-2014 Intel Mobile Communications GmbH
Sara Sharon42e7f372017-02-06 15:28:42 +02007 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
Johannes Berg571ecf62007-07-27 15:43:22 +02008 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
S.Çağlar Onurab466232008-02-14 17:36:47 +020014#include <linux/jiffies.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090015#include <linux/slab.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020016#include <linux/kernel.h>
17#include <linux/skbuff.h>
18#include <linux/netdevice.h>
19#include <linux/etherdevice.h>
Johannes Bergd4e46a32007-09-14 11:10:24 -040020#include <linux/rcupdate.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040021#include <linux/export.h>
Sara Sharon06470f72016-01-28 16:19:25 +020022#include <linux/bitops.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020023#include <net/mac80211.h>
24#include <net/ieee80211_radiotap.h>
Johannes Bergd26ad372012-02-20 11:38:41 +010025#include <asm/unaligned.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020026
27#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020028#include "driver-ops.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040029#include "led.h"
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +010030#include "mesh.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020031#include "wep.h"
32#include "wpa.h"
33#include "tkip.h"
34#include "wme.h"
Johannes Berg1d8d3de2011-12-16 15:28:57 +010035#include "rate.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020036
Johannes Berg5a490512015-04-22 17:10:38 +020037static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
38{
39 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
40
41 u64_stats_update_begin(&tstats->syncp);
42 tstats->rx_packets++;
43 tstats->rx_bytes += len;
44 u64_stats_update_end(&tstats->syncp);
45}
46
Johannes Berga6828492015-06-16 15:17:15 +020047static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
48 enum nl80211_iftype type)
49{
50 __le16 fc = hdr->frame_control;
51
52 if (ieee80211_is_data(fc)) {
53 if (len < 24) /* drop incorrect hdr len (data) */
54 return NULL;
55
56 if (ieee80211_has_a4(fc))
57 return NULL;
58 if (ieee80211_has_tods(fc))
59 return hdr->addr1;
60 if (ieee80211_has_fromds(fc))
61 return hdr->addr2;
62
63 return hdr->addr3;
64 }
65
66 if (ieee80211_is_mgmt(fc)) {
67 if (len < 24) /* drop incorrect hdr len (mgmt) */
68 return NULL;
69 return hdr->addr3;
70 }
71
72 if (ieee80211_is_ctl(fc)) {
73 if (ieee80211_is_pspoll(fc))
74 return hdr->addr1;
75
76 if (ieee80211_is_back_req(fc)) {
77 switch (type) {
78 case NL80211_IFTYPE_STATION:
79 return hdr->addr2;
80 case NL80211_IFTYPE_AP:
81 case NL80211_IFTYPE_AP_VLAN:
82 return hdr->addr1;
83 default:
84 break; /* fall through to the return */
85 }
86 }
87 }
88
89 return NULL;
90}
91
Johannes Bergb2e77712007-09-26 15:19:39 +020092/*
93 * monitor mode reception
94 *
95 * This function cleans up the SKB, i.e. it removes all the stuff
96 * only useful for monitoring.
97 */
98static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
Johannes Berg1f7bba72014-11-06 22:56:36 +010099 struct sk_buff *skb,
100 unsigned int rtap_vendor_space)
Johannes Bergb2e77712007-09-26 15:19:39 +0200101{
Johannes Berg30686bf2015-06-02 21:39:54 +0200102 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200103 if (likely(skb->len > FCS_LEN))
Zhu Yie3cf8b32010-03-29 17:35:07 +0800104 __pskb_trim(skb, skb->len - FCS_LEN);
Johannes Bergb2e77712007-09-26 15:19:39 +0200105 else {
106 /* driver bug */
107 WARN_ON(1);
108 dev_kfree_skb(skb);
Dan Carpenter06247602012-11-27 20:31:19 +0300109 return NULL;
Johannes Bergb2e77712007-09-26 15:19:39 +0200110 }
111 }
112
Johannes Berg1f7bba72014-11-06 22:56:36 +0100113 __pskb_pull(skb, rtap_vendor_space);
114
Johannes Bergb2e77712007-09-26 15:19:39 +0200115 return skb;
116}
117
Johannes Berg1f7bba72014-11-06 22:56:36 +0100118static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
119 unsigned int rtap_vendor_space)
Johannes Bergb2e77712007-09-26 15:19:39 +0200120{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200121 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg1f7bba72014-11-06 22:56:36 +0100122 struct ieee80211_hdr *hdr;
123
124 hdr = (void *)(skb->data + rtap_vendor_space);
Johannes Bergb2e77712007-09-26 15:19:39 +0200125
Johannes Berg4c298672012-07-05 11:34:31 +0200126 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
Grzegorz Bajorski17883042015-12-11 14:39:46 +0100127 RX_FLAG_FAILED_PLCP_CRC |
128 RX_FLAG_ONLY_MONITOR))
Zhao, Gang6b59db72014-04-21 12:52:59 +0800129 return true;
130
Johannes Berg1f7bba72014-11-06 22:56:36 +0100131 if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
Zhao, Gang6b59db72014-04-21 12:52:59 +0800132 return true;
133
Harvey Harrison87228f52008-06-11 14:21:59 -0700134 if (ieee80211_is_ctl(hdr->frame_control) &&
135 !ieee80211_is_pspoll(hdr->frame_control) &&
136 !ieee80211_is_back_req(hdr->frame_control))
Zhao, Gang6b59db72014-04-21 12:52:59 +0800137 return true;
138
139 return false;
Johannes Bergb2e77712007-09-26 15:19:39 +0200140}
141
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200142static int
Johannes Berg1f7bba72014-11-06 22:56:36 +0100143ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
144 struct ieee80211_rx_status *status,
145 struct sk_buff *skb)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200146{
147 int len;
148
149 /* always present fields */
Johannes Berga144f372013-07-03 13:34:02 +0200150 len = sizeof(struct ieee80211_radiotap_header) + 8;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200151
Johannes Berga144f372013-07-03 13:34:02 +0200152 /* allocate extra bitmaps */
Johannes Berga144f372013-07-03 13:34:02 +0200153 if (status->chains)
154 len += 4 * hweight8(status->chains);
Johannes Berg4470e512018-12-15 11:03:12 +0200155 /* vendor presence bitmap */
156 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
157 len += 4;
Johannes Berg90b9e4462012-11-16 10:09:08 +0100158
159 if (ieee80211_have_rx_timestamp(status)) {
160 len = ALIGN(len, 8);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200161 len += 8;
Johannes Berg90b9e4462012-11-16 10:09:08 +0100162 }
Johannes Berg30686bf2015-06-02 21:39:54 +0200163 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200164 len += 1;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200165
Johannes Berga144f372013-07-03 13:34:02 +0200166 /* antenna field, if we don't have per-chain info */
167 if (!status->chains)
168 len += 1;
169
Johannes Berg90b9e4462012-11-16 10:09:08 +0100170 /* padding for RX_FLAGS if necessary */
171 len = ALIGN(len, 2);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200172
Johannes Berg6d744ba2011-01-27 14:13:17 +0100173 if (status->flag & RX_FLAG_HT) /* HT info */
174 len += 3;
175
Johannes Berg4c298672012-07-05 11:34:31 +0200176 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
Johannes Berg90b9e4462012-11-16 10:09:08 +0100177 len = ALIGN(len, 4);
Johannes Berg4c298672012-07-05 11:34:31 +0200178 len += 8;
179 }
180
Johannes Berg51648922012-11-22 23:00:18 +0100181 if (status->flag & RX_FLAG_VHT) {
182 len = ALIGN(len, 2);
183 len += 12;
184 }
185
Johannes Berg99ee7ca2016-08-29 23:25:17 +0300186 if (local->hw.radiotap_timestamp.units_pos >= 0) {
187 len = ALIGN(len, 8);
188 len += 12;
189 }
190
Johannes Berga144f372013-07-03 13:34:02 +0200191 if (status->chains) {
192 /* antenna and antenna signal fields */
193 len += 2 * hweight8(status->chains);
194 }
195
Johannes Berg1f7bba72014-11-06 22:56:36 +0100196 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
197 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
198
Johannes Berg1f7bba72014-11-06 22:56:36 +0100199 /* alignment for fixed 6-byte vendor data header */
200 len = ALIGN(len, 2);
201 /* vendor data header */
202 len += 6;
203 if (WARN_ON(rtap->align == 0))
204 rtap->align = 1;
205 len = ALIGN(len, rtap->align);
206 len += rtap->len + rtap->pad;
207 }
208
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200209 return len;
210}
211
Johannes Berg87cfeaa2017-04-13 14:23:49 +0200212static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
213 struct sk_buff *skb,
214 int rtap_vendor_space)
215{
216 struct {
217 struct ieee80211_hdr_3addr hdr;
218 u8 category;
219 u8 action_code;
Mathieu Malaterre5b8acf22019-01-24 19:19:57 +0100220 } __packed __aligned(2) action;
Johannes Berg87cfeaa2017-04-13 14:23:49 +0200221
222 if (!sdata)
223 return;
224
225 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
226
227 if (skb->len < rtap_vendor_space + sizeof(action) +
228 VHT_MUMIMO_GROUPS_DATA_LEN)
229 return;
230
231 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
232 return;
233
234 skb_copy_bits(skb, rtap_vendor_space, &action, sizeof(action));
235
236 if (!ieee80211_is_action(action.hdr.frame_control))
237 return;
238
239 if (action.category != WLAN_CATEGORY_VHT)
240 return;
241
242 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
243 return;
244
245 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
246 return;
247
248 skb = skb_copy(skb, GFP_ATOMIC);
249 if (!skb)
250 return;
251
252 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
253 skb_queue_tail(&sdata->skb_queue, skb);
254 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
255}
256
Johannes Berg00ea6de2012-09-05 15:54:51 +0200257/*
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200258 * ieee80211_add_rx_radiotap_header - add radiotap header
259 *
260 * add a radiotap header containing all the fields which the hardware provided.
261 */
262static void
263ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
264 struct sk_buff *skb,
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200265 struct ieee80211_rate *rate,
Felix Fietkau973ef212012-04-16 14:56:48 +0200266 int rtap_len, bool has_fcs)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200267{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200268 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200269 struct ieee80211_radiotap_header *rthdr;
270 unsigned char *pos;
Johannes Berga144f372013-07-03 13:34:02 +0200271 __le32 *it_present;
272 u32 it_present_val;
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100273 u16 rx_flags = 0;
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200274 u16 channel_flags = 0;
Johannes Berga144f372013-07-03 13:34:02 +0200275 int mpdulen, chain;
276 unsigned long chains = status->chains;
Johannes Berg1f7bba72014-11-06 22:56:36 +0100277 struct ieee80211_vendor_radiotap rtap = {};
278
279 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
280 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
281 /* rtap.len and rtap.pad are undone immediately */
282 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
283 }
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800284
285 mpdulen = skb->len;
Johannes Berg30686bf2015-06-02 21:39:54 +0200286 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800287 mpdulen += FCS_LEN;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200288
289 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
Johannes Berg1f7bba72014-11-06 22:56:36 +0100290 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
Johannes Berga144f372013-07-03 13:34:02 +0200291 it_present = &rthdr->it_present;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200292
293 /* radiotap header, set always present flags */
Emmanuel Grumbach0059b2b2014-02-05 16:36:01 +0200294 rthdr->it_len = cpu_to_le16(rtap_len);
Johannes Berga144f372013-07-03 13:34:02 +0200295 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
296 BIT(IEEE80211_RADIOTAP_CHANNEL) |
297 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200298
Johannes Berga144f372013-07-03 13:34:02 +0200299 if (!status->chains)
300 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
301
302 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
303 it_present_val |=
304 BIT(IEEE80211_RADIOTAP_EXT) |
305 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
306 put_unaligned_le32(it_present_val, it_present);
307 it_present++;
308 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
309 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
310 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200311
Johannes Berg1f7bba72014-11-06 22:56:36 +0100312 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
313 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
314 BIT(IEEE80211_RADIOTAP_EXT);
315 put_unaligned_le32(it_present_val, it_present);
316 it_present++;
317 it_present_val = rtap.present;
318 }
319
Johannes Berga144f372013-07-03 13:34:02 +0200320 put_unaligned_le32(it_present_val, it_present);
321
322 pos = (void *)(it_present + 1);
323
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200324 /* the order of the following fields is important */
325
326 /* IEEE80211_RADIOTAP_TSFT */
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800327 if (ieee80211_have_rx_timestamp(status)) {
Johannes Berg90b9e4462012-11-16 10:09:08 +0100328 /* padding */
329 while ((pos - (u8 *)rthdr) & 7)
330 *pos++ = 0;
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800331 put_unaligned_le64(
332 ieee80211_calculate_rx_timestamp(local, status,
333 mpdulen, 0),
334 pos);
Johannes Berg1df332e2012-10-26 00:09:11 +0200335 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200336 pos += 8;
337 }
338
339 /* IEEE80211_RADIOTAP_FLAGS */
Johannes Berg30686bf2015-06-02 21:39:54 +0200340 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200341 *pos |= IEEE80211_RADIOTAP_F_FCS;
Johannes Bergaae89832009-03-13 12:52:10 +0100342 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
343 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
Bruno Randolfb4f28bb2008-07-30 17:19:55 +0200344 if (status->flag & RX_FLAG_SHORTPRE)
345 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200346 pos++;
347
348 /* IEEE80211_RADIOTAP_RATE */
Johannes Berg56146182012-11-09 15:07:02 +0100349 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200350 /*
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100351 * Without rate information don't add it. If we have,
Mohammed Shafi Shajakhan38f37be2011-02-07 10:10:04 +0530352 * MCS information is a separate field in radiotap,
Johannes Berg73b48092011-04-18 17:05:21 +0200353 * added below. The byte here is needed as padding
354 * for the channel though, so initialise it to 0.
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200355 */
356 *pos = 0;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200357 } else {
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200358 int shift = 0;
Jouni Malinenebe6c7b2009-01-10 11:47:33 +0200359 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200360 if (status->flag & RX_FLAG_10MHZ)
361 shift = 1;
362 else if (status->flag & RX_FLAG_5MHZ)
363 shift = 2;
364 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200365 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200366 pos++;
367
368 /* IEEE80211_RADIOTAP_CHANNEL */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100369 put_unaligned_le16(status->freq, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200370 pos += 2;
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200371 if (status->flag & RX_FLAG_10MHZ)
372 channel_flags |= IEEE80211_CHAN_HALF;
373 else if (status->flag & RX_FLAG_5MHZ)
374 channel_flags |= IEEE80211_CHAN_QUARTER;
375
Johannes Berg57fbcce2016-04-12 15:56:15 +0200376 if (status->band == NL80211_BAND_5GHZ)
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200377 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
Johannes Berg56146182012-11-09 15:07:02 +0100378 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200379 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100380 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200381 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100382 else if (rate)
Mathy Vanhoef3a5c5e82015-01-20 15:05:08 +0100383 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100384 else
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200385 channel_flags |= IEEE80211_CHAN_2GHZ;
386 put_unaligned_le16(channel_flags, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200387 pos += 2;
388
389 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
Johannes Berg30686bf2015-06-02 21:39:54 +0200390 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
Felix Fietkaufe8431f2012-03-01 18:00:07 +0100391 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200392 *pos = status->signal;
393 rthdr->it_present |=
394 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
395 pos++;
396 }
397
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200398 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
399
Johannes Berga144f372013-07-03 13:34:02 +0200400 if (!status->chains) {
401 /* IEEE80211_RADIOTAP_ANTENNA */
402 *pos = status->antenna;
403 pos++;
404 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200405
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200406 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
407
408 /* IEEE80211_RADIOTAP_RX_FLAGS */
409 /* ensure 2 byte alignment for the 2 byte field as required */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100410 if ((pos - (u8 *)rthdr) & 1)
Johannes Berg90b9e4462012-11-16 10:09:08 +0100411 *pos++ = 0;
Johannes Bergaae89832009-03-13 12:52:10 +0100412 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100413 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
414 put_unaligned_le16(rx_flags, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200415 pos += 2;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100416
417 if (status->flag & RX_FLAG_HT) {
Oleksij Rempel786677d2013-05-24 12:05:45 +0200418 unsigned int stbc;
419
Johannes Berg6d744ba2011-01-27 14:13:17 +0100420 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
Johannes Bergac55d2f2012-05-10 09:09:10 +0200421 *pos++ = local->hw.radiotap_mcs_details;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100422 *pos = 0;
423 if (status->flag & RX_FLAG_SHORT_GI)
424 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
425 if (status->flag & RX_FLAG_40MHZ)
426 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
Johannes Bergac55d2f2012-05-10 09:09:10 +0200427 if (status->flag & RX_FLAG_HT_GF)
428 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
Emmanuel Grumbach63c361f2014-02-05 12:48:53 +0200429 if (status->flag & RX_FLAG_LDPC)
430 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
Oleksij Rempel786677d2013-05-24 12:05:45 +0200431 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
432 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100433 pos++;
434 *pos++ = status->rate_idx;
435 }
Johannes Berg4c298672012-07-05 11:34:31 +0200436
437 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
438 u16 flags = 0;
439
440 /* ensure 4 byte alignment */
441 while ((pos - (u8 *)rthdr) & 3)
442 pos++;
443 rthdr->it_present |=
444 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
445 put_unaligned_le32(status->ampdu_reference, pos);
446 pos += 4;
Johannes Berg4c298672012-07-05 11:34:31 +0200447 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
448 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
449 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
450 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
451 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
452 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
453 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
454 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
455 put_unaligned_le16(flags, pos);
456 pos += 2;
457 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
458 *pos++ = status->ampdu_delimiter_crc;
459 else
460 *pos++ = 0;
461 *pos++ = 0;
462 }
Johannes Berg90b9e4462012-11-16 10:09:08 +0100463
Johannes Berg51648922012-11-22 23:00:18 +0100464 if (status->flag & RX_FLAG_VHT) {
465 u16 known = local->hw.radiotap_vht_details;
466
467 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
Johannes Berg51648922012-11-22 23:00:18 +0100468 put_unaligned_le16(known, pos);
469 pos += 2;
470 /* flags */
471 if (status->flag & RX_FLAG_SHORT_GI)
472 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
Emmanuel Grumbach63c361f2014-02-05 12:48:53 +0200473 /* in VHT, STBC is binary */
474 if (status->flag & RX_FLAG_STBC_MASK)
475 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
Emmanuel Grumbachfb378c22014-03-04 10:35:25 +0200476 if (status->vht_flag & RX_VHT_FLAG_BF)
477 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
Johannes Berg51648922012-11-22 23:00:18 +0100478 pos++;
479 /* bandwidth */
Emmanuel Grumbach1b8d2422014-02-05 16:37:11 +0200480 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
Johannes Berg51648922012-11-22 23:00:18 +0100481 *pos++ = 4;
Emmanuel Grumbach1b8d2422014-02-05 16:37:11 +0200482 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
Johannes Berg51648922012-11-22 23:00:18 +0100483 *pos++ = 11;
484 else if (status->flag & RX_FLAG_40MHZ)
485 *pos++ = 1;
486 else /* 20 MHz */
487 *pos++ = 0;
488 /* MCS/NSS */
489 *pos = (status->rate_idx << 4) | status->vht_nss;
490 pos += 4;
491 /* coding field */
Emmanuel Grumbach63c361f2014-02-05 12:48:53 +0200492 if (status->flag & RX_FLAG_LDPC)
493 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
Johannes Berg51648922012-11-22 23:00:18 +0100494 pos++;
495 /* group ID */
496 pos++;
497 /* partial_aid */
498 pos += 2;
499 }
500
Johannes Berg99ee7ca2016-08-29 23:25:17 +0300501 if (local->hw.radiotap_timestamp.units_pos >= 0) {
502 u16 accuracy = 0;
503 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
504
505 rthdr->it_present |=
506 cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
507
508 /* ensure 8 byte alignment */
509 while ((pos - (u8 *)rthdr) & 7)
510 pos++;
511
512 put_unaligned_le64(status->device_timestamp, pos);
513 pos += sizeof(u64);
514
515 if (local->hw.radiotap_timestamp.accuracy >= 0) {
516 accuracy = local->hw.radiotap_timestamp.accuracy;
517 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
518 }
519 put_unaligned_le16(accuracy, pos);
520 pos += sizeof(u16);
521
522 *pos++ = local->hw.radiotap_timestamp.units_pos;
523 *pos++ = flags;
524 }
525
Johannes Berga144f372013-07-03 13:34:02 +0200526 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
527 *pos++ = status->chain_signal[chain];
528 *pos++ = chain;
529 }
Johannes Berg1f7bba72014-11-06 22:56:36 +0100530
531 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
532 /* ensure 2 byte alignment for the vendor field as required */
533 if ((pos - (u8 *)rthdr) & 1)
534 *pos++ = 0;
535 *pos++ = rtap.oui[0];
536 *pos++ = rtap.oui[1];
537 *pos++ = rtap.oui[2];
538 *pos++ = rtap.subns;
539 put_unaligned_le16(rtap.len, pos);
540 pos += 2;
541 /* align the actual payload as requested */
542 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
543 *pos++ = 0;
544 /* data (and possible padding) already follows */
545 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200546}
547
Johannes Bergb2e77712007-09-26 15:19:39 +0200548/*
549 * This function copies a received frame to all monitor interfaces and
550 * returns a cleaned-up SKB that no longer includes the FCS nor the
551 * radiotap header the driver might have added.
552 */
553static struct sk_buff *
554ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
Johannes Berg8318d782008-01-24 19:38:38 +0100555 struct ieee80211_rate *rate)
Johannes Bergb2e77712007-09-26 15:19:39 +0200556{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200557 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200558 struct ieee80211_sub_if_data *sdata;
Johannes Berg1f7bba72014-11-06 22:56:36 +0100559 int rt_hdrlen, needed_headroom;
Johannes Bergb2e77712007-09-26 15:19:39 +0200560 struct sk_buff *skb, *skb2;
561 struct net_device *prev_dev = NULL;
562 int present_fcs_len = 0;
Johannes Berg1f7bba72014-11-06 22:56:36 +0100563 unsigned int rtap_vendor_space = 0;
Aviya Erenfeld42bd20d2016-08-29 23:25:16 +0300564 struct ieee80211_sub_if_data *monitor_sdata =
565 rcu_dereference(local->monitor_sdata);
Johannes Berg1f7bba72014-11-06 22:56:36 +0100566
567 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
568 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
569
570 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
571 }
Johannes Bergb2e77712007-09-26 15:19:39 +0200572
573 /*
574 * First, we may need to make a copy of the skb because
575 * (1) we need to modify it for radiotap (if not present), and
576 * (2) the other RX handlers will modify the skb we got.
577 *
578 * We don't need to, of course, if we aren't going to return
579 * the SKB because it has a bad FCS/PLCP checksum.
580 */
Johannes Berg0869aea2009-10-28 10:03:35 +0100581
Johannes Berg30686bf2015-06-02 21:39:54 +0200582 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
Johannes Bergb2e77712007-09-26 15:19:39 +0200583 present_fcs_len = FCS_LEN;
584
Johannes Berg1f7bba72014-11-06 22:56:36 +0100585 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
586 if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
Zhu Yie3cf8b32010-03-29 17:35:07 +0800587 dev_kfree_skb(origskb);
588 return NULL;
589 }
590
Grzegorz Bajorski17883042015-12-11 14:39:46 +0100591 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
Johannes Berg1f7bba72014-11-06 22:56:36 +0100592 if (should_drop_frame(origskb, present_fcs_len,
593 rtap_vendor_space)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200594 dev_kfree_skb(origskb);
595 return NULL;
596 }
597
Johannes Berg1f7bba72014-11-06 22:56:36 +0100598 return remove_monitor_info(local, origskb, rtap_vendor_space);
Johannes Bergb2e77712007-09-26 15:19:39 +0200599 }
600
Johannes Berg87cfeaa2017-04-13 14:23:49 +0200601 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_vendor_space);
602
Helmut Schaa751413e2012-12-05 14:36:12 +0100603 /* room for the radiotap header based on driver features */
Johannes Berg1f7bba72014-11-06 22:56:36 +0100604 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
605 needed_headroom = rt_hdrlen - rtap_vendor_space;
Helmut Schaa751413e2012-12-05 14:36:12 +0100606
Johannes Berg1f7bba72014-11-06 22:56:36 +0100607 if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200608 /* only need to expand headroom if necessary */
609 skb = origskb;
610 origskb = NULL;
611
612 /*
613 * This shouldn't trigger often because most devices have an
614 * RX header they pull before we get here, and that should
615 * be big enough for our radiotap information. We should
616 * probably export the length to drivers so that we can have
617 * them allocate enough headroom to start with.
618 */
619 if (skb_headroom(skb) < needed_headroom &&
Johannes Bergc49e5ea2007-12-11 21:33:42 +0100620 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200621 dev_kfree_skb(skb);
622 return NULL;
623 }
624 } else {
625 /*
626 * Need to make a copy and possibly remove radiotap header
627 * and FCS from the original.
628 */
629 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
630
Johannes Berg1f7bba72014-11-06 22:56:36 +0100631 origskb = remove_monitor_info(local, origskb,
632 rtap_vendor_space);
Johannes Bergb2e77712007-09-26 15:19:39 +0200633
634 if (!skb)
635 return origskb;
636 }
637
Johannes Berg0869aea2009-10-28 10:03:35 +0100638 /* prepend radiotap information */
Johannes Berg1f7bba72014-11-06 22:56:36 +0100639 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
Johannes Bergb2e77712007-09-26 15:19:39 +0200640
Johannes Bergce3edf6d02007-12-19 01:31:22 +0100641 skb_reset_mac_header(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200642 skb->ip_summed = CHECKSUM_UNNECESSARY;
643 skb->pkt_type = PACKET_OTHERHOST;
644 skb->protocol = htons(ETH_P_802_2);
645
646 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200647 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +0200648 continue;
649
Aviya Erenfeldd8212182016-08-29 23:25:15 +0300650 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
Michael Wu3d30d942008-01-31 19:48:27 +0100651 continue;
652
Johannes Berg9607e6b2009-12-23 13:15:31 +0100653 if (!ieee80211_sdata_running(sdata))
Johannes Berg47846c92009-11-25 17:46:19 +0100654 continue;
655
Johannes Bergb2e77712007-09-26 15:19:39 +0200656 if (prev_dev) {
657 skb2 = skb_clone(skb, GFP_ATOMIC);
658 if (skb2) {
659 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400660 netif_receive_skb(skb2);
Johannes Bergb2e77712007-09-26 15:19:39 +0200661 }
662 }
663
664 prev_dev = sdata->dev;
Johannes Berg5a490512015-04-22 17:10:38 +0200665 ieee80211_rx_stats(sdata->dev, skb->len);
Johannes Bergb2e77712007-09-26 15:19:39 +0200666 }
667
668 if (prev_dev) {
669 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400670 netif_receive_skb(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200671 } else
672 dev_kfree_skb(skb);
673
674 return origskb;
675}
676
Johannes Berg5cf121c2008-02-25 16:27:43 +0100677static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200678{
Harvey Harrison238f74a2008-07-02 11:05:34 -0700679 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +0200680 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg9e262972011-07-07 18:45:03 +0200681 int tid, seqno_idx, security_idx;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200682
683 /* does the frame have a qos control field? */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700684 if (ieee80211_is_data_qos(hdr->frame_control)) {
685 u8 *qc = ieee80211_get_qos_ctl(hdr);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200686 /* frame has qos control */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700687 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
Johannes Berg04b7dcf2011-06-22 10:06:59 +0200688 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
Johannes Berg554891e2010-09-24 12:38:25 +0200689 status->rx_flags |= IEEE80211_RX_AMSDU;
Johannes Berg9e262972011-07-07 18:45:03 +0200690
691 seqno_idx = tid;
692 security_idx = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200693 } else {
Johannes Berg1411f9b2008-07-10 10:11:02 +0200694 /*
695 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
696 *
697 * Sequence numbers for management frames, QoS data
698 * frames with a broadcast/multicast address in the
699 * Address 1 field, and all non-QoS data frames sent
700 * by QoS STAs are assigned using an additional single
701 * modulo-4096 counter, [...]
702 *
703 * We also use that counter for non-QoS STAs.
704 */
Johannes Berg5a306f52012-11-14 23:22:21 +0100705 seqno_idx = IEEE80211_NUM_TIDS;
Johannes Berg9e262972011-07-07 18:45:03 +0200706 security_idx = 0;
707 if (ieee80211_is_mgmt(hdr->frame_control))
Johannes Berg5a306f52012-11-14 23:22:21 +0100708 security_idx = IEEE80211_NUM_TIDS;
Johannes Berg9e262972011-07-07 18:45:03 +0200709 tid = 0;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200710 }
Johannes Berg52865dfd2007-07-27 15:43:22 +0200711
Johannes Berg9e262972011-07-07 18:45:03 +0200712 rx->seqno_idx = seqno_idx;
713 rx->security_idx = security_idx;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200714 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
715 * For now, set skb->priority to 0 for other cases. */
716 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100717}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200718
Johannes Bergd1c3a372009-01-07 00:26:10 +0100719/**
720 * DOC: Packet alignment
721 *
722 * Drivers always need to pass packets that are aligned to two-byte boundaries
723 * to the stack.
724 *
725 * Additionally, should, if possible, align the payload data in a way that
726 * guarantees that the contained IP header is aligned to a four-byte
727 * boundary. In the case of regular frames, this simply means aligning the
728 * payload to a four-byte boundary (because either the IP header is directly
729 * contained, or IV/RFC1042 headers that have a length divisible by four are
Kalle Valo59d9cb02009-12-17 13:54:57 +0100730 * in front of it). If the payload data is not properly aligned and the
731 * architecture doesn't support efficient unaligned operations, mac80211
732 * will align the data.
Johannes Bergd1c3a372009-01-07 00:26:10 +0100733 *
734 * With A-MSDU frames, however, the payload data address must yield two modulo
735 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
736 * push the IP header further back to a multiple of four again. Thankfully, the
737 * specs were sane enough this time around to require padding each A-MSDU
738 * subframe to a length that is a multiple of four.
739 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300740 * Padding like Atheros hardware adds which is between the 802.11 header and
Johannes Bergd1c3a372009-01-07 00:26:10 +0100741 * the payload is not supported, the driver is required to move the 802.11
742 * header to be directly in front of the payload in that case.
743 */
744static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
Johannes Berg38f37142008-01-29 17:07:43 +0100745{
Kalle Valo59d9cb02009-12-17 13:54:57 +0100746#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg441275e2015-11-06 12:34:24 +0100747 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
Johannes Bergd1c3a372009-01-07 00:26:10 +0100748#endif
Johannes Berg6e0d1142007-07-27 15:43:22 +0200749}
750
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +0200751
Johannes Berg571ecf62007-07-27 15:43:22 +0200752/* rx handlers */
753
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200754static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
755{
756 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
757
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100758 if (is_multicast_ether_addr(hdr->addr1))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200759 return 0;
760
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100761 return ieee80211_is_robust_mgmt_frame(skb);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200762}
763
764
765static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
766{
767 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
768
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100769 if (!is_multicast_ether_addr(hdr->addr1))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200770 return 0;
771
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100772 return ieee80211_is_robust_mgmt_frame(skb);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200773}
774
775
776/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
777static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
778{
779 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
780 struct ieee80211_mmie *mmie;
Jouni Malinen56c52da2015-01-24 19:52:08 +0200781 struct ieee80211_mmie_16 *mmie16;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200782
Johannes Berg1df332e2012-10-26 00:09:11 +0200783 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200784 return -1;
785
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100786 if (!ieee80211_is_robust_mgmt_frame(skb))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200787 return -1; /* not a robust management frame */
788
789 mmie = (struct ieee80211_mmie *)
790 (skb->data + skb->len - sizeof(*mmie));
Jouni Malinen56c52da2015-01-24 19:52:08 +0200791 if (mmie->element_id == WLAN_EID_MMIE &&
792 mmie->length == sizeof(*mmie) - 2)
793 return le16_to_cpu(mmie->key_id);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200794
Jouni Malinen56c52da2015-01-24 19:52:08 +0200795 mmie16 = (struct ieee80211_mmie_16 *)
796 (skb->data + skb->len - sizeof(*mmie16));
797 if (skb->len >= 24 + sizeof(*mmie16) &&
798 mmie16->element_id == WLAN_EID_MMIE &&
799 mmie16->length == sizeof(*mmie16) - 2)
800 return le16_to_cpu(mmie16->key_id);
801
802 return -1;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200803}
804
Johannes Berg2c61cf92016-03-17 15:02:55 +0200805static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
806 struct sk_buff *skb)
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200807{
808 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
809 __le16 fc;
810 int hdrlen;
811 u8 keyid;
812
813 fc = hdr->frame_control;
814 hdrlen = ieee80211_hdrlen(fc);
815
816 if (skb->len < hdrlen + cs->hdr_len)
817 return -EINVAL;
818
819 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
820 keyid &= cs->key_idx_mask;
821 keyid >>= cs->key_idx_shift;
822
823 return keyid;
824}
825
Johannes Berg1df332e2012-10-26 00:09:11 +0200826static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100827{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700828 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg47846c92009-11-25 17:46:19 +0100829 char *dev_addr = rx->sdata->vif.addr;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100830
Harvey Harrisona7767f92008-07-02 16:30:51 -0700831 if (ieee80211_is_data(hdr->frame_control)) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700832 if (is_multicast_ether_addr(hdr->addr1)) {
833 if (ieee80211_has_tods(hdr->frame_control) ||
Johannes Berg1df332e2012-10-26 00:09:11 +0200834 !ieee80211_has_fromds(hdr->frame_control))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700835 return RX_DROP_MONITOR;
Joe Perchesb203ca32012-05-08 18:56:52 +0000836 if (ether_addr_equal(hdr->addr3, dev_addr))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700837 return RX_DROP_MONITOR;
838 } else {
839 if (!ieee80211_has_a4(hdr->frame_control))
840 return RX_DROP_MONITOR;
Joe Perchesb203ca32012-05-08 18:56:52 +0000841 if (ether_addr_equal(hdr->addr4, dev_addr))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700842 return RX_DROP_MONITOR;
843 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100844 }
845
846 /* If there is not an established peer link and this is not a peer link
847 * establisment frame, beacon or probe, drop the frame.
848 */
849
Javier Cardona57cf8042011-05-13 10:45:43 -0700850 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100851 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100852
Harvey Harrisona7767f92008-07-02 16:30:51 -0700853 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100854 return RX_DROP_MONITOR;
855
Harvey Harrisona7767f92008-07-02 16:30:51 -0700856 if (ieee80211_is_action(hdr->frame_control)) {
Javier Cardonad3aaec8a2011-05-03 16:57:09 -0700857 u8 category;
Johannes Berg9b395bc2012-10-26 00:36:40 +0200858
859 /* make sure category field is present */
860 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
861 return RX_DROP_MONITOR;
862
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100863 mgmt = (struct ieee80211_mgmt *)hdr;
Javier Cardonad3aaec8a2011-05-03 16:57:09 -0700864 category = mgmt->u.action.category;
865 if (category != WLAN_CATEGORY_MESH_ACTION &&
Johannes Berg1df332e2012-10-26 00:09:11 +0200866 category != WLAN_CATEGORY_SELF_PROTECTED)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100867 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100868 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100869 }
870
Harvey Harrisona7767f92008-07-02 16:30:51 -0700871 if (ieee80211_is_probe_req(hdr->frame_control) ||
872 ieee80211_is_probe_resp(hdr->frame_control) ||
Javier Cardona71839122011-04-07 15:08:31 -0700873 ieee80211_is_beacon(hdr->frame_control) ||
874 ieee80211_is_auth(hdr->frame_control))
Harvey Harrisona7767f92008-07-02 16:30:51 -0700875 return RX_CONTINUE;
876
877 return RX_DROP_MONITOR;
Harvey Harrisona7767f92008-07-02 16:30:51 -0700878 }
879
Johannes Berg902acc72008-02-23 15:17:19 +0100880 return RX_CONTINUE;
881}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100882
Johannes Bergfb4ea052016-01-28 16:19:24 +0200883static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
884 int index)
885{
886 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
887 struct sk_buff *tail = skb_peek_tail(frames);
888 struct ieee80211_rx_status *status;
889
Sara Sharon06470f72016-01-28 16:19:25 +0200890 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
891 return true;
892
Johannes Bergfb4ea052016-01-28 16:19:24 +0200893 if (!tail)
894 return false;
895
896 status = IEEE80211_SKB_RXCB(tail);
897 if (status->flag & RX_FLAG_AMSDU_MORE)
898 return false;
899
900 return true;
901}
902
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200903static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100904 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000905 int index,
906 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100907{
Michal Kazior83eb9352014-07-16 12:09:31 +0200908 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
909 struct sk_buff *skb;
Christian Lamparter4cfda472010-12-27 23:21:26 +0100910 struct ieee80211_rx_status *status;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100911
Johannes Bergdd318572010-11-29 11:09:16 +0100912 lockdep_assert_held(&tid_agg_rx->reorder_lock);
913
Michal Kazior83eb9352014-07-16 12:09:31 +0200914 if (skb_queue_empty(skb_list))
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100915 goto no_frame;
916
Johannes Bergfb4ea052016-01-28 16:19:24 +0200917 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
Michal Kazior83eb9352014-07-16 12:09:31 +0200918 __skb_queue_purge(skb_list);
919 goto no_frame;
920 }
921
922 /* release frames from the reorder ring buffer */
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100923 tid_agg_rx->stored_mpdu_num--;
Michal Kazior83eb9352014-07-16 12:09:31 +0200924 while ((skb = __skb_dequeue(skb_list))) {
925 status = IEEE80211_SKB_RXCB(skb);
926 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
927 __skb_queue_tail(frames, skb);
928 }
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100929
930no_frame:
Sara Sharon06470f72016-01-28 16:19:25 +0200931 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
Johannes Berg9a886582013-02-15 19:25:00 +0100932 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100933}
934
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200935static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100936 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000937 u16 head_seq_num,
938 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100939{
940 int index;
941
Johannes Bergdd318572010-11-29 11:09:16 +0100942 lockdep_assert_held(&tid_agg_rx->reorder_lock);
943
Johannes Berg9a886582013-02-15 19:25:00 +0100944 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
Karl Beldan2e3049b2013-10-24 15:53:32 +0200945 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000946 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
947 frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100948 }
949}
950
951/*
952 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
953 * the skb was added to the buffer longer than this time ago, the earlier
954 * frames that have not yet been received are assumed to be lost and the skb
955 * can be released for processing. This may also release other skb's from the
956 * reorder buffer if there are no additional gaps between the frames.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200957 *
958 * Callers must hold tid_agg_rx->reorder_lock.
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100959 */
960#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
961
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200962static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000963 struct tid_ampdu_rx *tid_agg_rx,
964 struct sk_buff_head *frames)
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200965{
Michal Kazior83eb9352014-07-16 12:09:31 +0200966 int index, i, j;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200967
Johannes Bergdd318572010-11-29 11:09:16 +0100968 lockdep_assert_held(&tid_agg_rx->reorder_lock);
969
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200970 /* release the buffer until next missing frame */
Karl Beldan2e3049b2013-10-24 15:53:32 +0200971 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Johannes Bergfb4ea052016-01-28 16:19:24 +0200972 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
Eliad Peller07ae2df2012-02-01 18:48:09 +0200973 tid_agg_rx->stored_mpdu_num) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200974 /*
975 * No buffers ready to be released, but check whether any
976 * frames in the reorder buffer have timed out.
977 */
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200978 int skipped = 1;
979 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
980 j = (j + 1) % tid_agg_rx->buf_size) {
Johannes Bergfb4ea052016-01-28 16:19:24 +0200981 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200982 skipped++;
983 continue;
984 }
Daniel Halperin499fe9a2011-03-24 16:01:48 -0700985 if (skipped &&
986 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200987 HT_RX_REORDER_BUF_TIMEOUT))
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200988 goto set_release_timer;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200989
Michal Kazior83eb9352014-07-16 12:09:31 +0200990 /* don't leave incomplete A-MSDUs around */
991 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
992 i = (i + 1) % tid_agg_rx->buf_size)
993 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
994
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200995 ht_dbg_ratelimited(sdata,
996 "release an RX reorder frame due to timeout on earlier frames\n");
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000997 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
998 frames);
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200999
1000 /*
1001 * Increment the head seq# also for the skipped slots.
1002 */
1003 tid_agg_rx->head_seq_num =
Johannes Berg9a886582013-02-15 19:25:00 +01001004 (tid_agg_rx->head_seq_num +
1005 skipped) & IEEE80211_SN_MASK;
Christian Lamparteraa0c8632010-08-05 01:36:04 +02001006 skipped = 0;
1007 }
Johannes Bergfb4ea052016-01-28 16:19:24 +02001008 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
Christian Lamparterf9e124f2013-02-04 17:44:44 +00001009 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1010 frames);
Karl Beldan2e3049b2013-10-24 15:53:32 +02001011 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Christian Lamparteraa0c8632010-08-05 01:36:04 +02001012 }
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001013
1014 if (tid_agg_rx->stored_mpdu_num) {
Karl Beldan2e3049b2013-10-24 15:53:32 +02001015 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001016
1017 for (; j != (index - 1) % tid_agg_rx->buf_size;
1018 j = (j + 1) % tid_agg_rx->buf_size) {
Johannes Bergfb4ea052016-01-28 16:19:24 +02001019 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001020 break;
1021 }
1022
1023 set_release_timer:
1024
Johannes Berg788211d2015-04-01 14:20:42 +02001025 if (!tid_agg_rx->removed)
1026 mod_timer(&tid_agg_rx->reorder_timer,
1027 tid_agg_rx->reorder_time[j] + 1 +
1028 HT_RX_REORDER_BUF_TIMEOUT);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001029 } else {
1030 del_timer(&tid_agg_rx->reorder_timer);
1031 }
Christian Lamparteraa0c8632010-08-05 01:36:04 +02001032}
1033
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001034/*
1035 * As this function belongs to the RX path it must be under
1036 * rcu_read_lock protection. It returns false if the frame
1037 * can be processed immediately, true if it was consumed.
1038 */
Johannes Bergd3b2fb52012-06-22 12:48:38 +02001039static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001040 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +00001041 struct sk_buff *skb,
1042 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001043{
1044 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Michal Kazior83eb9352014-07-16 12:09:31 +02001045 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001046 u16 sc = le16_to_cpu(hdr->seq_ctrl);
1047 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1048 u16 head_seq_num, buf_size;
1049 int index;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001050 bool ret = true;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001051
Johannes Bergdd318572010-11-29 11:09:16 +01001052 spin_lock(&tid_agg_rx->reorder_lock);
1053
Michal Kazior4549cf22014-09-02 14:05:10 +02001054 /*
1055 * Offloaded BA sessions have no known starting sequence number so pick
1056 * one from first Rxed frame for this tid after BA was started.
1057 */
1058 if (unlikely(tid_agg_rx->auto_seq)) {
1059 tid_agg_rx->auto_seq = false;
1060 tid_agg_rx->ssn = mpdu_seq_num;
1061 tid_agg_rx->head_seq_num = mpdu_seq_num;
1062 }
1063
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001064 buf_size = tid_agg_rx->buf_size;
1065 head_seq_num = tid_agg_rx->head_seq_num;
1066
Sara Sharon42e7f372017-02-06 15:28:42 +02001067 /*
1068 * If the current MPDU's SN is smaller than the SSN, it shouldn't
1069 * be reordered.
1070 */
1071 if (unlikely(!tid_agg_rx->started)) {
1072 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1073 ret = false;
1074 goto out;
1075 }
1076 tid_agg_rx->started = true;
1077 }
1078
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001079 /* frame with out of date sequence number */
Johannes Berg9a886582013-02-15 19:25:00 +01001080 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001081 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001082 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001083 }
1084
1085 /*
1086 * If frame the sequence number exceeds our buffering window
1087 * size release some previous frames to make room for this one.
1088 */
Johannes Berg9a886582013-02-15 19:25:00 +01001089 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1090 head_seq_num = ieee80211_sn_inc(
1091 ieee80211_sn_sub(mpdu_seq_num, buf_size));
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001092 /* release stored frames up to new head to stack */
Johannes Bergd3b2fb52012-06-22 12:48:38 +02001093 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +00001094 head_seq_num, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001095 }
1096
1097 /* Now the new frame is always in the range of the reordering buffer */
1098
Karl Beldan2e3049b2013-10-24 15:53:32 +02001099 index = mpdu_seq_num % tid_agg_rx->buf_size;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001100
1101 /* check if we already stored this frame */
Johannes Bergfb4ea052016-01-28 16:19:24 +02001102 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001103 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001104 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001105 }
1106
1107 /*
1108 * If the current MPDU is in the right order and nothing else
1109 * is stored we can process it directly, no need to buffer it.
Johannes Bergc835b212011-03-15 23:17:01 +01001110 * If it is first but there's something stored, we may be able
1111 * to release frames after this one.
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001112 */
1113 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1114 tid_agg_rx->stored_mpdu_num == 0) {
Michal Kazior83eb9352014-07-16 12:09:31 +02001115 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1116 tid_agg_rx->head_seq_num =
1117 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001118 ret = false;
1119 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001120 }
1121
1122 /* put the frame in the reordering buffer */
Michal Kazior83eb9352014-07-16 12:09:31 +02001123 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1124 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1125 tid_agg_rx->reorder_time[index] = jiffies;
1126 tid_agg_rx->stored_mpdu_num++;
1127 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1128 }
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001129
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001130 out:
1131 spin_unlock(&tid_agg_rx->reorder_lock);
1132 return ret;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001133}
1134
1135/*
1136 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1137 * true if the MPDU was buffered, false if it should be processed.
1138 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +00001139static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1140 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001141{
Johannes Berg2569a822009-11-25 17:46:17 +01001142 struct sk_buff *skb = rx->skb;
1143 struct ieee80211_local *local = rx->local;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001144 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Johannes Berg2569a822009-11-25 17:46:17 +01001145 struct sta_info *sta = rx->sta;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001146 struct tid_ampdu_rx *tid_agg_rx;
1147 u16 sc;
Thomas Pedersen6cc00d52011-11-03 21:11:11 -07001148 u8 tid, ack_policy;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001149
Johannes Berg051a41f2013-11-20 11:28:27 +01001150 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1151 is_multicast_ether_addr(hdr->addr1))
Johannes Berg2569a822009-11-25 17:46:17 +01001152 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001153
1154 /*
1155 * filter the QoS data rx stream according to
1156 * STA/TID and check if this STA/TID is on aggregation
1157 */
1158
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001159 if (!sta)
Johannes Berg2569a822009-11-25 17:46:17 +01001160 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001161
Thomas Pedersen6cc00d52011-11-03 21:11:11 -07001162 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1163 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001164 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1165
Johannes Berga87f7362010-06-10 10:21:38 +02001166 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
Johannes Bergbfe40fa2016-08-29 23:25:18 +03001167 if (!tid_agg_rx) {
1168 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1169 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1170 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1171 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1172 WLAN_BACK_RECIPIENT,
1173 WLAN_REASON_QSTA_REQUIRE_SETUP);
Johannes Berga87f7362010-06-10 10:21:38 +02001174 goto dont_reorder;
Johannes Bergbfe40fa2016-08-29 23:25:18 +03001175 }
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001176
1177 /* qos null data frames are excluded */
1178 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Johannes Berga87f7362010-06-10 10:21:38 +02001179 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001180
Thomas Pedersen6cc00d52011-11-03 21:11:11 -07001181 /* not part of a BA session */
1182 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1183 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1184 goto dont_reorder;
1185
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001186 /* new, potentially un-ordered, ampdu frame - process it */
1187
1188 /* reset session timer */
1189 if (tid_agg_rx->timeout)
Felix Fietkau12d3952f2012-03-18 22:58:06 +01001190 tid_agg_rx->last_rx = jiffies;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001191
1192 /* if this mpdu is fragmented - terminate rx aggregation session */
1193 sc = le16_to_cpu(hdr->seq_ctrl);
1194 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Bergc1475ca2010-06-10 10:21:37 +02001195 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg344eec62010-06-10 10:21:36 +02001196 skb_queue_tail(&rx->sdata->skb_queue, skb);
1197 ieee80211_queue_work(&local->hw, &rx->sdata->work);
Johannes Berg2569a822009-11-25 17:46:17 +01001198 return;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001199 }
1200
Johannes Berga87f7362010-06-10 10:21:38 +02001201 /*
1202 * No locking needed -- we will only ever process one
1203 * RX packet at a time, and thus own tid_agg_rx. All
1204 * other code manipulating it needs to (and does) make
1205 * sure that we cannot get to it any more before doing
1206 * anything with it.
1207 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +00001208 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1209 frames))
Johannes Berg2569a822009-11-25 17:46:17 +01001210 return;
1211
1212 dont_reorder:
Christian Lamparterf9e124f2013-02-04 17:44:44 +00001213 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001214}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001215
Johannes Berg49461622008-06-30 15:10:45 +02001216static ieee80211_rx_result debug_noinline
Johannes Berg03954422014-11-11 16:49:25 +01001217ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001218{
Harvey Harrisona7767f92008-07-02 16:30:51 -07001219 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02001220 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001221
Sara Sharonf9cfa5f2015-12-08 16:04:33 +02001222 if (status->flag & RX_FLAG_DUP_VALIDATED)
1223 return RX_CONTINUE;
1224
Johannes Berg6b0f3272013-07-11 22:33:26 +02001225 /*
1226 * Drop duplicate 802.11 retransmissions
1227 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1228 */
Johannes Berg03954422014-11-11 16:49:25 +01001229
1230 if (rx->skb->len < 24)
1231 return RX_CONTINUE;
1232
1233 if (ieee80211_is_ctl(hdr->frame_control) ||
Emmanuel Grumbachfd54ea72018-12-03 21:16:07 +02001234 ieee80211_is_nullfunc(hdr->frame_control) ||
Johannes Berg03954422014-11-11 16:49:25 +01001235 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1236 is_multicast_ether_addr(hdr->addr1))
1237 return RX_CONTINUE;
1238
Johannes Berga732fa72015-10-14 18:27:07 +02001239 if (!rx->sta)
1240 return RX_CONTINUE;
1241
1242 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1243 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1244 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001245 rx->sta->rx_stats.num_duplicates++;
Johannes Berga732fa72015-10-14 18:27:07 +02001246 return RX_DROP_UNUSABLE;
1247 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1248 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +02001249 }
1250
Johannes Berg03954422014-11-11 16:49:25 +01001251 return RX_CONTINUE;
1252}
1253
1254static ieee80211_rx_result debug_noinline
1255ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1256{
1257 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1258
Johannes Berg571ecf62007-07-27 15:43:22 +02001259 /* Drop disallowed frame classes based on STA auth/assoc state;
1260 * IEEE 802.11, Chap 5.5.
1261 *
Johannes Bergccd7b362008-09-11 00:01:56 +02001262 * mac80211 filters only based on association state, i.e. it drops
1263 * Class 3 frames from not associated stations. hostapd sends
Johannes Berg571ecf62007-07-27 15:43:22 +02001264 * deauth/disassoc frames when needed. In addition, hostapd is
1265 * responsible for filtering on both auth and assoc states.
1266 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001267
Johannes Berg902acc72008-02-23 15:17:19 +01001268 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001269 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001270
Harvey Harrisona7767f92008-07-02 16:30:51 -07001271 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1272 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001273 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Bill Jordan1be7fe82010-10-01 11:20:41 -04001274 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
Rostislav Lisovy239281f2014-11-03 10:33:19 +01001275 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001276 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
Johannes Berg7852e362012-01-20 13:55:24 +01001277 /*
1278 * accept port control frames from the AP even when it's not
1279 * yet marked ASSOC to prevent a race where we don't set the
1280 * assoc bit quickly enough before it sends the first frame
1281 */
1282 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
Guy Eilam2a33bee2011-08-17 15:18:15 +03001283 ieee80211_is_data_present(hdr->frame_control)) {
Johannes Berg6dbda2d2012-10-26 00:41:23 +02001284 unsigned int hdrlen;
1285 __be16 ethertype;
Guy Eilam2a33bee2011-08-17 15:18:15 +03001286
Johannes Berg6dbda2d2012-10-26 00:41:23 +02001287 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1288
1289 if (rx->skb->len < hdrlen + 8)
1290 return RX_DROP_MONITOR;
1291
1292 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1293 if (ethertype == rx->sdata->control_port_protocol)
Guy Eilam2a33bee2011-08-17 15:18:15 +03001294 return RX_CONTINUE;
1295 }
Johannes Berg21fc7562011-11-04 11:18:13 +01001296
1297 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1298 cfg80211_rx_spurious_frame(rx->sdata->dev,
1299 hdr->addr2,
1300 GFP_ATOMIC))
1301 return RX_DROP_UNUSABLE;
1302
Johannes Berge4c26ad2008-01-31 19:48:21 +01001303 return RX_DROP_MONITOR;
Guy Eilam2a33bee2011-08-17 15:18:15 +03001304 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001305
Johannes Berg9ae54c82008-01-31 19:48:20 +01001306 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +02001307}
1308
1309
Johannes Berg49461622008-06-30 15:10:45 +02001310static ieee80211_rx_result debug_noinline
Kalle Valo572e0012009-02-10 17:09:31 +02001311ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1312{
1313 struct ieee80211_local *local;
1314 struct ieee80211_hdr *hdr;
1315 struct sk_buff *skb;
1316
1317 local = rx->local;
1318 skb = rx->skb;
1319 hdr = (struct ieee80211_hdr *) skb->data;
1320
1321 if (!local->pspolling)
1322 return RX_CONTINUE;
1323
1324 if (!ieee80211_has_fromds(hdr->frame_control))
1325 /* this is not from AP */
1326 return RX_CONTINUE;
1327
1328 if (!ieee80211_is_data(hdr->frame_control))
1329 return RX_CONTINUE;
1330
1331 if (!ieee80211_has_moredata(hdr->frame_control)) {
1332 /* AP has no more frames buffered for us */
1333 local->pspolling = false;
1334 return RX_CONTINUE;
1335 }
1336
1337 /* more data bit is set, let's request a new frame from the AP */
1338 ieee80211_send_pspoll(local, rx->sdata);
1339
1340 return RX_CONTINUE;
1341}
1342
Marco Porschd012a602012-10-10 12:39:50 -07001343static void sta_ps_start(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001344{
Johannes Berg133b8222008-09-16 14:18:59 +02001345 struct ieee80211_sub_if_data *sdata = sta->sdata;
Christian Lamparter4571d3b2008-11-30 00:48:41 +01001346 struct ieee80211_local *local = sdata->local;
Marco Porschd012a602012-10-10 12:39:50 -07001347 struct ps_data *ps;
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001348 int tid;
Joe Perches0795af52007-10-03 17:59:30 -07001349
Marco Porschd012a602012-10-10 12:39:50 -07001350 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1351 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1352 ps = &sdata->bss->ps;
1353 else
1354 return;
1355
1356 atomic_inc(&ps->num_sta_ps);
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001357 set_sta_flag(sta, WLAN_STA_PS_STA);
Johannes Berg30686bf2015-06-02 21:39:54 +02001358 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001359 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001360 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1361 sta->sta.addr, sta->sta.aid);
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001362
Johannes Berg17c18bf2015-03-21 15:25:43 +01001363 ieee80211_clear_fast_xmit(sta);
1364
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001365 if (!sta->sta.txq[0])
1366 return;
1367
1368 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02001369 if (txq_has_queue(sta->sta.txq[tid]))
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001370 set_bit(tid, &sta->txq_buffered_tids);
1371 else
1372 clear_bit(tid, &sta->txq_buffered_tids);
1373 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001374}
1375
Marco Porschd012a602012-10-10 12:39:50 -07001376static void sta_ps_end(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001377{
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001378 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1379 sta->sta.addr, sta->sta.aid);
Johannes Berg004c8722008-02-20 11:21:35 +01001380
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001381 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
Johannes Berge3685e02014-02-20 11:19:58 +01001382 /*
1383 * Clear the flag only if the other one is still set
1384 * so that the TX path won't start TX'ing new frames
1385 * directly ... In the case that the driver flag isn't
1386 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1387 */
1388 clear_sta_flag(sta, WLAN_STA_PS_STA);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001389 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1390 sta->sta.addr, sta->sta.aid);
Johannes Bergaf818582009-11-06 11:35:50 +01001391 return;
1392 }
1393
Johannes Berg5ac2e352014-05-27 16:32:27 +02001394 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1395 clear_sta_flag(sta, WLAN_STA_PS_STA);
Johannes Bergaf818582009-11-06 11:35:50 +01001396 ieee80211_sta_ps_deliver_wakeup(sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001397}
1398
Johannes Bergcf471612015-06-16 16:16:38 +02001399int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001400{
Johannes Bergcf471612015-06-16 16:16:38 +02001401 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001402 bool in_ps;
1403
Johannes Bergcf471612015-06-16 16:16:38 +02001404 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001405
1406 /* Don't let the same PS state be set twice */
Johannes Bergcf471612015-06-16 16:16:38 +02001407 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001408 if ((start && in_ps) || (!start && !in_ps))
1409 return -EINVAL;
1410
1411 if (start)
Johannes Bergcf471612015-06-16 16:16:38 +02001412 sta_ps_start(sta);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001413 else
Johannes Bergcf471612015-06-16 16:16:38 +02001414 sta_ps_end(sta);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001415
1416 return 0;
1417}
1418EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1419
Johannes Berg46fa38e2016-05-03 16:58:00 +03001420void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1421{
1422 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1423
1424 if (test_sta_flag(sta, WLAN_STA_SP))
1425 return;
1426
1427 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1428 ieee80211_sta_ps_deliver_poll_response(sta);
1429 else
1430 set_sta_flag(sta, WLAN_STA_PSPOLL);
1431}
1432EXPORT_SYMBOL(ieee80211_sta_pspoll);
1433
1434void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1435{
1436 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1437 u8 ac = ieee802_1d_to_ac[tid & 7];
1438
1439 /*
1440 * If this AC is not trigger-enabled do nothing.
1441 *
1442 * NB: This could/should check a separate bitmap of trigger-
1443 * enabled queues, but for now we only implement uAPSD w/o
1444 * TSPEC changes to the ACs, so they're always the same.
1445 */
1446 if (!(sta->sta.uapsd_queues & BIT(ac)))
1447 return;
1448
1449 /* if we are in a service period, do nothing */
1450 if (test_sta_flag(sta, WLAN_STA_SP))
1451 return;
1452
1453 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1454 ieee80211_sta_ps_deliver_uapsd(sta);
1455 else
1456 set_sta_flag(sta, WLAN_STA_UAPSD);
1457}
1458EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1459
Johannes Berg49461622008-06-30 15:10:45 +02001460static ieee80211_rx_result debug_noinline
Johannes Berg47086fc2011-09-29 16:04:33 +02001461ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1462{
1463 struct ieee80211_sub_if_data *sdata = rx->sdata;
1464 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1465 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg47086fc2011-09-29 16:04:33 +02001466
Johannes Berg5c900672015-04-22 14:48:34 +02001467 if (!rx->sta)
Johannes Berg47086fc2011-09-29 16:04:33 +02001468 return RX_CONTINUE;
1469
1470 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1471 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1472 return RX_CONTINUE;
1473
1474 /*
1475 * The device handles station powersave, so don't do anything about
1476 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1477 * it to mac80211 since they're handled.)
1478 */
Johannes Berg30686bf2015-06-02 21:39:54 +02001479 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
Johannes Berg47086fc2011-09-29 16:04:33 +02001480 return RX_CONTINUE;
1481
1482 /*
1483 * Don't do anything if the station isn't already asleep. In
1484 * the uAPSD case, the station will probably be marked asleep,
1485 * in the PS-Poll case the station must be confused ...
1486 */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001487 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
Johannes Berg47086fc2011-09-29 16:04:33 +02001488 return RX_CONTINUE;
1489
1490 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
Johannes Berg46fa38e2016-05-03 16:58:00 +03001491 ieee80211_sta_pspoll(&rx->sta->sta);
Johannes Berg47086fc2011-09-29 16:04:33 +02001492
1493 /* Free PS Poll skb here instead of returning RX_DROP that would
1494 * count as an dropped frame. */
1495 dev_kfree_skb(rx->skb);
1496
1497 return RX_QUEUED;
1498 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1499 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1500 ieee80211_has_pm(hdr->frame_control) &&
1501 (ieee80211_is_data_qos(hdr->frame_control) ||
1502 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
Johannes Berg46fa38e2016-05-03 16:58:00 +03001503 u8 tid;
1504
Johannes Berg47086fc2011-09-29 16:04:33 +02001505 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
Johannes Berg47086fc2011-09-29 16:04:33 +02001506
Johannes Berg46fa38e2016-05-03 16:58:00 +03001507 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
Johannes Berg47086fc2011-09-29 16:04:33 +02001508 }
1509
1510 return RX_CONTINUE;
1511}
1512
1513static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001514ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001515{
1516 struct sta_info *sta = rx->sta;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001517 struct sk_buff *skb = rx->skb;
1518 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1519 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Felix Fietkauef0621e2013-04-22 16:29:31 +02001520 int i;
Johannes Berg571ecf62007-07-27 15:43:22 +02001521
1522 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001523 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001524
Johannes Bergb291ba12009-07-10 15:29:03 +02001525 /*
1526 * Update last_rx only for IBSS packets which are for the current
Antonio Quartullie584da5e2012-11-25 23:13:42 +01001527 * BSSID and for station already AUTHORIZED to avoid keeping the
1528 * current IBSS network alive in cases where other STAs start
1529 * using different BSSID. This will also give the station another
1530 * chance to restart the authentication/authorization in case
1531 * something went wrong the first time.
Johannes Bergb291ba12009-07-10 15:29:03 +02001532 */
Johannes Berg05c914f2008-09-11 00:01:58 +02001533 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001534 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +02001535 NL80211_IFTYPE_ADHOC);
Antonio Quartullie584da5e2012-11-25 23:13:42 +01001536 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1537 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001538 sta->rx_stats.last_rx = jiffies;
Henning Roggef4ebddf2014-05-01 10:03:46 +02001539 if (ieee80211_is_data(hdr->frame_control) &&
Johannes Berg4f6b1b32016-03-31 20:02:08 +03001540 !is_multicast_ether_addr(hdr->addr1))
1541 sta->rx_stats.last_rate =
1542 sta_stats_encode_rate(status);
Felix Fietkau3af63342011-02-27 22:08:01 +01001543 }
Rostislav Lisovy239281f2014-11-03 10:33:19 +01001544 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001545 sta->rx_stats.last_rx = jiffies;
Johannes Bergb291ba12009-07-10 15:29:03 +02001546 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1547 /*
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001548 * Mesh beacons will update last_rx when if they are found to
1549 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +02001550 */
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001551 sta->rx_stats.last_rx = jiffies;
Johannes Berg4f6b1b32016-03-31 20:02:08 +03001552 if (ieee80211_is_data(hdr->frame_control))
1553 sta->rx_stats.last_rate = sta_stats_encode_rate(status);
Johannes Berg571ecf62007-07-27 15:43:22 +02001554 }
1555
Kalle Valo3cf335d2009-03-22 21:57:06 +02001556 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1557 ieee80211_sta_rx_notify(rx->sdata, hdr);
1558
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001559 sta->rx_stats.fragments++;
Johannes Berg0f9c5a62016-03-31 20:02:09 +03001560
1561 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001562 sta->rx_stats.bytes += rx->skb->len;
Johannes Berg0f9c5a62016-03-31 20:02:09 +03001563 u64_stats_update_end(&rx->sta->rx_stats.syncp);
1564
Felix Fietkaufe8431f2012-03-01 18:00:07 +01001565 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001566 sta->rx_stats.last_signal = status->signal;
Johannes Berg0be6ed12016-03-31 20:02:05 +03001567 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
Felix Fietkaufe8431f2012-03-01 18:00:07 +01001568 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001569
Felix Fietkauef0621e2013-04-22 16:29:31 +02001570 if (status->chains) {
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001571 sta->rx_stats.chains = status->chains;
Felix Fietkauef0621e2013-04-22 16:29:31 +02001572 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1573 int signal = status->chain_signal[i];
1574
1575 if (!(status->chains & BIT(i)))
1576 continue;
1577
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001578 sta->rx_stats.chain_signal_last[i] = signal;
Johannes Berg0be6ed12016-03-31 20:02:05 +03001579 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001580 -signal);
Felix Fietkauef0621e2013-04-22 16:29:31 +02001581 }
1582 }
1583
Johannes Berg72eaa432008-11-26 15:02:58 +01001584 /*
1585 * Change STA power saving mode only at the end of a frame
1586 * exchange sequence.
1587 */
Johannes Berg30686bf2015-06-02 21:39:54 +02001588 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001589 !ieee80211_has_morefrags(hdr->frame_control) &&
Emmanuel Grumbach2ec5b682017-06-08 14:00:49 +03001590 !ieee80211_is_back_req(hdr->frame_control) &&
Christian Lamparter4cfda472010-12-27 23:21:26 +01001591 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001592 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
Johannes Bergb4ba5442014-01-24 14:41:44 +01001593 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Emmanuel Grumbach2ec5b682017-06-08 14:00:49 +03001594 /*
1595 * PM bit is only checked in frames where it isn't reserved,
Johannes Bergb4ba5442014-01-24 14:41:44 +01001596 * in AP mode it's reserved in non-bufferable management frames
1597 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
Emmanuel Grumbach2ec5b682017-06-08 14:00:49 +03001598 * BAR frames should be ignored as specified in
1599 * IEEE 802.11-2012 10.2.1.2.
Johannes Bergb4ba5442014-01-24 14:41:44 +01001600 */
1601 (!ieee80211_is_mgmt(hdr->frame_control) ||
1602 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001603 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
Johannes Bergb4ba5442014-01-24 14:41:44 +01001604 if (!ieee80211_has_pm(hdr->frame_control))
Marco Porschd012a602012-10-10 12:39:50 -07001605 sta_ps_end(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001606 } else {
1607 if (ieee80211_has_pm(hdr->frame_control))
Marco Porschd012a602012-10-10 12:39:50 -07001608 sta_ps_start(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001609 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001610 }
1611
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001612 /* mesh power save support */
1613 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1614 ieee80211_mps_rx_h_sta_process(sta, hdr);
1615
Johannes Berg22403de2009-10-30 12:55:03 +01001616 /*
1617 * Drop (qos-)data::nullfunc frames silently, since they
1618 * are used only to control station power saving mode.
1619 */
1620 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1621 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001622 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
Felix Fietkaud5242152010-01-08 18:06:26 +01001623
1624 /*
1625 * If we receive a 4-addr nullfunc frame from a STA
Johannes Berge7f4a942011-11-04 11:18:20 +01001626 * that was not moved to a 4-addr STA vlan yet send
1627 * the event to userspace and for older hostapd drop
1628 * the frame to the monitor interface.
Felix Fietkaud5242152010-01-08 18:06:26 +01001629 */
1630 if (ieee80211_has_a4(hdr->frame_control) &&
1631 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1632 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
Johannes Berge7f4a942011-11-04 11:18:20 +01001633 !rx->sdata->u.vlan.sta))) {
1634 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1635 cfg80211_rx_unexpected_4addr_frame(
1636 rx->sdata->dev, sta->sta.addr,
1637 GFP_ATOMIC);
Felix Fietkaud5242152010-01-08 18:06:26 +01001638 return RX_DROP_MONITOR;
Johannes Berge7f4a942011-11-04 11:18:20 +01001639 }
Johannes Berg22403de2009-10-30 12:55:03 +01001640 /*
1641 * Update counter and free packet here to avoid
1642 * counting this as a dropped packed.
1643 */
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001644 sta->rx_stats.packets++;
Johannes Berg571ecf62007-07-27 15:43:22 +02001645 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001646 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001647 }
1648
Johannes Berg9ae54c82008-01-31 19:48:20 +01001649 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001650} /* ieee80211_rx_h_sta_process */
1651
Johan Almbladh86c228a2013-08-14 15:29:46 +02001652static ieee80211_rx_result debug_noinline
1653ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1654{
1655 struct sk_buff *skb = rx->skb;
1656 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1657 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1658 int keyidx;
1659 int hdrlen;
1660 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1661 struct ieee80211_key *sta_ptk = NULL;
1662 int mmie_keyidx = -1;
1663 __le16 fc;
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001664 const struct ieee80211_cipher_scheme *cs = NULL;
Johan Almbladh86c228a2013-08-14 15:29:46 +02001665
1666 /*
1667 * Key selection 101
1668 *
1669 * There are four types of keys:
1670 * - GTK (group keys)
1671 * - IGTK (group keys for management frames)
1672 * - PTK (pairwise keys)
1673 * - STK (station-to-station pairwise keys)
1674 *
1675 * When selecting a key, we have to distinguish between multicast
1676 * (including broadcast) and unicast frames, the latter can only
1677 * use PTKs and STKs while the former always use GTKs and IGTKs.
1678 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1679 * unicast frames can also use key indices like GTKs. Hence, if we
1680 * don't have a PTK/STK we check the key index for a WEP key.
1681 *
1682 * Note that in a regular BSS, multicast frames are sent by the
1683 * AP only, associated stations unicast the frame to the AP first
1684 * which then multicasts it on their behalf.
1685 *
1686 * There is also a slight problem in IBSS mode: GTKs are negotiated
1687 * with each station, that is something we don't currently handle.
1688 * The spec seems to expect that one negotiates the same key with
1689 * every station but there's no such requirement; VLANs could be
1690 * possible.
1691 */
1692
Johan Almbladh86c228a2013-08-14 15:29:46 +02001693 /* start without a key */
1694 rx->key = NULL;
Johan Almbladh86c228a2013-08-14 15:29:46 +02001695 fc = hdr->frame_control;
1696
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001697 if (rx->sta) {
1698 int keyid = rx->sta->ptk_idx;
1699
1700 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1701 cs = rx->sta->cipher_scheme;
Johannes Berg2c61cf92016-03-17 15:02:55 +02001702 keyid = ieee80211_get_cs_keyid(cs, rx->skb);
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001703 if (unlikely(keyid < 0))
1704 return RX_DROP_UNUSABLE;
1705 }
1706 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1707 }
1708
Johan Almbladh86c228a2013-08-14 15:29:46 +02001709 if (!ieee80211_has_protected(fc))
1710 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1711
1712 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1713 rx->key = sta_ptk;
1714 if ((status->flag & RX_FLAG_DECRYPTED) &&
1715 (status->flag & RX_FLAG_IV_STRIPPED))
1716 return RX_CONTINUE;
1717 /* Skip decryption if the frame is not protected. */
1718 if (!ieee80211_has_protected(fc))
1719 return RX_CONTINUE;
1720 } else if (mmie_keyidx >= 0) {
1721 /* Broadcast/multicast robust management frame / BIP */
1722 if ((status->flag & RX_FLAG_DECRYPTED) &&
1723 (status->flag & RX_FLAG_IV_STRIPPED))
1724 return RX_CONTINUE;
1725
1726 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1727 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1728 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
Masashi Honma46f6b062016-06-22 19:55:20 +09001729 if (rx->sta) {
1730 if (ieee80211_is_group_privacy_action(skb) &&
1731 test_sta_flag(rx->sta, WLAN_STA_MFP))
1732 return RX_DROP_MONITOR;
1733
Johan Almbladh86c228a2013-08-14 15:29:46 +02001734 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
Masashi Honma46f6b062016-06-22 19:55:20 +09001735 }
Johan Almbladh86c228a2013-08-14 15:29:46 +02001736 if (!rx->key)
1737 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1738 } else if (!ieee80211_has_protected(fc)) {
1739 /*
1740 * The frame was not protected, so skip decryption. However, we
1741 * need to set rx->key if there is a key that could have been
1742 * used so that the frame may be dropped if encryption would
1743 * have been expected.
1744 */
1745 struct ieee80211_key *key = NULL;
1746 struct ieee80211_sub_if_data *sdata = rx->sdata;
1747 int i;
1748
1749 if (ieee80211_is_mgmt(fc) &&
1750 is_multicast_ether_addr(hdr->addr1) &&
1751 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1752 rx->key = key;
1753 else {
1754 if (rx->sta) {
1755 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1756 key = rcu_dereference(rx->sta->gtk[i]);
1757 if (key)
1758 break;
1759 }
1760 }
1761 if (!key) {
1762 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1763 key = rcu_dereference(sdata->keys[i]);
1764 if (key)
1765 break;
1766 }
1767 }
1768 if (key)
1769 rx->key = key;
1770 }
1771 return RX_CONTINUE;
1772 } else {
1773 u8 keyid;
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001774
Johan Almbladh86c228a2013-08-14 15:29:46 +02001775 /*
1776 * The device doesn't give us the IV so we won't be
1777 * able to look up the key. That's ok though, we
1778 * don't need to decrypt the frame, we just won't
1779 * be able to keep statistics accurate.
1780 * Except for key threshold notifications, should
1781 * we somehow allow the driver to tell us which key
1782 * the hardware used if this flag is set?
1783 */
1784 if ((status->flag & RX_FLAG_DECRYPTED) &&
1785 (status->flag & RX_FLAG_IV_STRIPPED))
1786 return RX_CONTINUE;
1787
1788 hdrlen = ieee80211_hdrlen(fc);
1789
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001790 if (cs) {
Johannes Berg2c61cf92016-03-17 15:02:55 +02001791 keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
Johan Almbladh86c228a2013-08-14 15:29:46 +02001792
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001793 if (unlikely(keyidx < 0))
1794 return RX_DROP_UNUSABLE;
1795 } else {
1796 if (rx->skb->len < 8 + hdrlen)
1797 return RX_DROP_UNUSABLE; /* TODO: count this? */
1798 /*
1799 * no need to call ieee80211_wep_get_keyidx,
1800 * it verifies a bunch of things we've done already
1801 */
1802 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1803 keyidx = keyid >> 6;
1804 }
Johan Almbladh86c228a2013-08-14 15:29:46 +02001805
1806 /* check per-station GTK first, if multicast packet */
1807 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1808 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1809
1810 /* if not found, try default key */
1811 if (!rx->key) {
1812 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1813
1814 /*
1815 * RSNA-protected unicast frames should always be
1816 * sent with pairwise or station-to-station keys,
1817 * but for WEP we allow using a key index as well.
1818 */
1819 if (rx->key &&
1820 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1821 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1822 !is_multicast_ether_addr(hdr->addr1))
1823 rx->key = NULL;
1824 }
1825 }
1826
1827 if (rx->key) {
1828 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1829 return RX_DROP_MONITOR;
1830
Johan Almbladh86c228a2013-08-14 15:29:46 +02001831 /* TODO: add threshold stuff again */
1832 } else {
1833 return RX_DROP_MONITOR;
1834 }
1835
1836 switch (rx->key->conf.cipher) {
1837 case WLAN_CIPHER_SUITE_WEP40:
1838 case WLAN_CIPHER_SUITE_WEP104:
1839 result = ieee80211_crypto_wep_decrypt(rx);
1840 break;
1841 case WLAN_CIPHER_SUITE_TKIP:
1842 result = ieee80211_crypto_tkip_decrypt(rx);
1843 break;
1844 case WLAN_CIPHER_SUITE_CCMP:
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +02001845 result = ieee80211_crypto_ccmp_decrypt(
1846 rx, IEEE80211_CCMP_MIC_LEN);
1847 break;
1848 case WLAN_CIPHER_SUITE_CCMP_256:
1849 result = ieee80211_crypto_ccmp_decrypt(
1850 rx, IEEE80211_CCMP_256_MIC_LEN);
Johan Almbladh86c228a2013-08-14 15:29:46 +02001851 break;
1852 case WLAN_CIPHER_SUITE_AES_CMAC:
1853 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1854 break;
Jouni Malinen56c52da2015-01-24 19:52:08 +02001855 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1856 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1857 break;
Jouni Malinen8ade5382015-01-24 19:52:09 +02001858 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1859 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1860 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1861 break;
Jouni Malinen00b9cfa2015-01-24 19:52:06 +02001862 case WLAN_CIPHER_SUITE_GCMP:
1863 case WLAN_CIPHER_SUITE_GCMP_256:
1864 result = ieee80211_crypto_gcmp_decrypt(rx);
1865 break;
Johan Almbladh86c228a2013-08-14 15:29:46 +02001866 default:
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001867 result = ieee80211_crypto_hw_decrypt(rx);
Johan Almbladh86c228a2013-08-14 15:29:46 +02001868 }
1869
1870 /* the hdr variable is invalid after the decrypt handlers */
1871
1872 /* either the frame has been decrypted or will be dropped */
1873 status->flag |= RX_FLAG_DECRYPTED;
1874
1875 return result;
1876}
1877
Johannes Berg571ecf62007-07-27 15:43:22 +02001878static inline struct ieee80211_fragment_entry *
1879ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1880 unsigned int frag, unsigned int seq, int rx_queue,
1881 struct sk_buff **skb)
1882{
1883 struct ieee80211_fragment_entry *entry;
Johannes Berg571ecf62007-07-27 15:43:22 +02001884
Johannes Berg571ecf62007-07-27 15:43:22 +02001885 entry = &sdata->fragments[sdata->fragment_next++];
1886 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1887 sdata->fragment_next = 0;
1888
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001889 if (!skb_queue_empty(&entry->skb_list))
Johannes Berg571ecf62007-07-27 15:43:22 +02001890 __skb_queue_purge(&entry->skb_list);
Johannes Berg571ecf62007-07-27 15:43:22 +02001891
1892 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1893 *skb = NULL;
1894 entry->first_frag_time = jiffies;
1895 entry->seq = seq;
1896 entry->rx_queue = rx_queue;
1897 entry->last_frag = frag;
Johannes Berg9acc54b2016-02-26 22:13:40 +01001898 entry->check_sequential_pn = false;
Johannes Berg571ecf62007-07-27 15:43:22 +02001899 entry->extra_len = 0;
1900
1901 return entry;
1902}
1903
1904static inline struct ieee80211_fragment_entry *
1905ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001906 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +02001907 int rx_queue, struct ieee80211_hdr *hdr)
1908{
1909 struct ieee80211_fragment_entry *entry;
1910 int i, idx;
1911
1912 idx = sdata->fragment_next;
1913 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1914 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +02001915
1916 idx--;
1917 if (idx < 0)
1918 idx = IEEE80211_FRAGMENT_MAX - 1;
1919
1920 entry = &sdata->fragments[idx];
1921 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1922 entry->rx_queue != rx_queue ||
1923 entry->last_frag + 1 != frag)
1924 continue;
1925
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001926 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001927
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001928 /*
1929 * Check ftype and addresses are equal, else check next fragment
1930 */
1931 if (((hdr->frame_control ^ f_hdr->frame_control) &
1932 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Joe Perchesb203ca32012-05-08 18:56:52 +00001933 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1934 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
Johannes Berg571ecf62007-07-27 15:43:22 +02001935 continue;
1936
S.Çağlar Onurab466232008-02-14 17:36:47 +02001937 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001938 __skb_queue_purge(&entry->skb_list);
1939 continue;
1940 }
1941 return entry;
1942 }
1943
1944 return NULL;
1945}
1946
Johannes Berg49461622008-06-30 15:10:45 +02001947static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001948ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001949{
1950 struct ieee80211_hdr *hdr;
1951 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001952 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001953 unsigned int frag, seq;
1954 struct ieee80211_fragment_entry *entry;
1955 struct sk_buff *skb;
Johannes Berg554891e2010-09-24 12:38:25 +02001956 struct ieee80211_rx_status *status;
Johannes Berg571ecf62007-07-27 15:43:22 +02001957
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001958 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001959 fc = hdr->frame_control;
Javier Cardonaf7fbf702012-10-25 11:10:18 -07001960
1961 if (ieee80211_is_ctl(fc))
1962 return RX_CONTINUE;
1963
Johannes Berg571ecf62007-07-27 15:43:22 +02001964 sc = le16_to_cpu(hdr->seq_ctrl);
1965 frag = sc & IEEE80211_SCTL_FRAG;
1966
Johannes Bergb8fff402014-11-03 13:57:46 +01001967 if (is_multicast_ether_addr(hdr->addr1)) {
Johannes Bergc206ca62015-04-22 20:47:28 +02001968 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
Andreas Müllerd0259332014-12-12 12:11:11 +01001969 goto out_no_led;
Johannes Berg571ecf62007-07-27 15:43:22 +02001970 }
Johannes Bergb8fff402014-11-03 13:57:46 +01001971
Andreas Müllerd0259332014-12-12 12:11:11 +01001972 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1973 goto out;
1974
Johannes Berg571ecf62007-07-27 15:43:22 +02001975 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1976
Zhu Yie3cf8b32010-03-29 17:35:07 +08001977 if (skb_linearize(rx->skb))
1978 return RX_DROP_UNUSABLE;
1979
Abhijeet Kolekar058897a2010-05-11 11:22:11 -07001980 /*
1981 * skb_linearize() might change the skb->data and
1982 * previously cached variables (in this case, hdr) need to
1983 * be refreshed with the new data.
1984 */
1985 hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001986 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1987
1988 if (frag == 0) {
1989 /* This is the first fragment of a new frame. */
1990 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg9e262972011-07-07 18:45:03 +02001991 rx->seqno_idx, &(rx->skb));
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +02001992 if (rx->key &&
1993 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
Johannes Berg9acc54b2016-02-26 22:13:40 +01001994 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
1995 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
1996 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
Harvey Harrison358c8d92008-07-15 18:44:13 -07001997 ieee80211_has_protected(fc)) {
Johannes Berg9e262972011-07-07 18:45:03 +02001998 int queue = rx->security_idx;
Johannes Berg9acc54b2016-02-26 22:13:40 +01001999
2000 /* Store CCMP/GCMP PN so that we can verify that the
2001 * next fragment has a sequential PN value.
2002 */
2003 entry->check_sequential_pn = true;
Johannes Berg571ecf62007-07-27 15:43:22 +02002004 memcpy(entry->last_pn,
Jouni Malinen91902522010-06-11 10:27:33 -07002005 rx->key->u.ccmp.rx_pn[queue],
Johannes Berg4325f6c2013-05-08 13:09:08 +02002006 IEEE80211_CCMP_PN_LEN);
Johannes Berg9acc54b2016-02-26 22:13:40 +01002007 BUILD_BUG_ON(offsetof(struct ieee80211_key,
2008 u.ccmp.rx_pn) !=
2009 offsetof(struct ieee80211_key,
2010 u.gcmp.rx_pn));
2011 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2012 sizeof(rx->key->u.gcmp.rx_pn[queue]));
2013 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2014 IEEE80211_GCMP_PN_LEN);
Johannes Berg571ecf62007-07-27 15:43:22 +02002015 }
Johannes Berg9ae54c82008-01-31 19:48:20 +01002016 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002017 }
2018
2019 /* This is a fragment for a frame that should already be pending in
2020 * fragment cache. Add this fragment to the end of the pending entry.
2021 */
Johannes Berg9e262972011-07-07 18:45:03 +02002022 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2023 rx->seqno_idx, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02002024 if (!entry) {
2025 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +01002026 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02002027 }
2028
Johannes Berg9acc54b2016-02-26 22:13:40 +01002029 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2030 * MPDU PN values are not incrementing in steps of 1."
2031 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2032 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2033 */
2034 if (entry->check_sequential_pn) {
Johannes Berg571ecf62007-07-27 15:43:22 +02002035 int i;
Johannes Berg4325f6c2013-05-08 13:09:08 +02002036 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
Jouni Malinen91902522010-06-11 10:27:33 -07002037 int queue;
Johannes Berg9acc54b2016-02-26 22:13:40 +01002038
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +02002039 if (!rx->key ||
2040 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
Johannes Berg9acc54b2016-02-26 22:13:40 +01002041 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2042 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2043 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002044 return RX_DROP_UNUSABLE;
Johannes Berg4325f6c2013-05-08 13:09:08 +02002045 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2046 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
Johannes Berg571ecf62007-07-27 15:43:22 +02002047 pn[i]++;
2048 if (pn[i])
2049 break;
2050 }
Johannes Berg9e262972011-07-07 18:45:03 +02002051 queue = rx->security_idx;
Jouni Malinen91902522010-06-11 10:27:33 -07002052 rpn = rx->key->u.ccmp.rx_pn[queue];
Johannes Berg4325f6c2013-05-08 13:09:08 +02002053 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002054 return RX_DROP_UNUSABLE;
Johannes Berg4325f6c2013-05-08 13:09:08 +02002055 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
Johannes Berg571ecf62007-07-27 15:43:22 +02002056 }
2057
Harvey Harrison358c8d92008-07-15 18:44:13 -07002058 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +02002059 __skb_queue_tail(&entry->skb_list, rx->skb);
2060 entry->last_frag = frag;
2061 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -07002062 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02002063 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +01002064 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002065 }
2066
2067 rx->skb = __skb_dequeue(&entry->skb_list);
2068 if (skb_tailroom(rx->skb) < entry->extra_len) {
Johannes Bergf1160432015-04-22 20:25:20 +02002069 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
Johannes Berg571ecf62007-07-27 15:43:22 +02002070 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2071 GFP_ATOMIC))) {
2072 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2073 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +01002074 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02002075 }
2076 }
2077 while ((skb = __skb_dequeue(&entry->skb_list))) {
2078 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
2079 dev_kfree_skb(skb);
2080 }
2081
2082 /* Complete frame has been reassembled - process it now */
Johannes Berg554891e2010-09-24 12:38:25 +02002083 status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002084
2085 out:
Andreas Müllerd0259332014-12-12 12:11:11 +01002086 ieee80211_led_rx(rx->local);
2087 out_no_led:
Johannes Berg571ecf62007-07-27 15:43:22 +02002088 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02002089 rx->sta->rx_stats.packets++;
Johannes Berg9ae54c82008-01-31 19:48:20 +01002090 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02002091}
2092
Johannes Berg1df332e2012-10-26 00:09:11 +02002093static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02002094{
Johannes Berg1df332e2012-10-26 00:09:11 +02002095 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002096 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02002097
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002098 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02002099}
2100
Johannes Berg1df332e2012-10-26 00:09:11 +02002101static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02002102{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002103 struct sk_buff *skb = rx->skb;
2104 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2105
Johannes Berg3017b802007-08-28 17:01:53 -04002106 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04002107 * Pass through unencrypted frames if the hardware has
2108 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04002109 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002110 if (status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002111 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02002112
2113 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07002114 if (unlikely(!ieee80211_has_protected(fc) &&
2115 !ieee80211_is_nullfunc(fc) &&
Johannes Berge8f4fb72015-03-20 11:37:36 +01002116 ieee80211_is_data(fc) && rx->key))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02002117 return -EACCES;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01002118
2119 return 0;
2120}
2121
Johannes Berg1df332e2012-10-26 00:09:11 +02002122static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
Johannes Bergbef5d1c2010-02-16 11:05:00 +01002123{
2124 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Jouni Malinene3efca02010-03-28 22:31:15 -07002125 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergbef5d1c2010-02-16 11:05:00 +01002126 __le16 fc = hdr->frame_control;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01002127
Jouni Malinene3efca02010-03-28 22:31:15 -07002128 /*
2129 * Pass through unencrypted frames if the hardware has
2130 * decrypted them already.
2131 */
2132 if (status->flag & RX_FLAG_DECRYPTED)
2133 return 0;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01002134
Johannes Bergc2c98fd2011-09-29 16:04:36 +02002135 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
Jouni Malinend211e902010-03-28 22:29:52 -07002136 if (unlikely(!ieee80211_has_protected(fc) &&
2137 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02002138 rx->key)) {
Johannes Berg6ff57cf2013-05-16 00:55:00 +02002139 if (ieee80211_is_deauth(fc) ||
2140 ieee80211_is_disassoc(fc))
2141 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2142 rx->skb->data,
2143 rx->skb->len);
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03002144 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02002145 }
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03002146 /* BIP does not use Protected field, so need to check MMIE */
Joe Perchesf64f9e72009-11-29 16:55:45 -08002147 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02002148 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
Johannes Berg6ff57cf2013-05-16 00:55:00 +02002149 if (ieee80211_is_deauth(fc) ||
2150 ieee80211_is_disassoc(fc))
2151 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2152 rx->skb->data,
2153 rx->skb->len);
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03002154 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02002155 }
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03002156 /*
2157 * When using MFP, Action frames are not allowed prior to
2158 * having configured keys.
2159 */
2160 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
Johannes Bergd8ca16d2014-01-23 16:20:29 +01002161 ieee80211_is_robust_mgmt_frame(rx->skb)))
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03002162 return -EACCES;
2163 }
Johannes Bergb3fc9c62008-04-13 10:12:47 +02002164
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002165 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02002166}
2167
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002168static int
Felix Fietkau4114fa22011-04-12 19:15:22 +02002169__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
Johannes Berg571ecf62007-07-27 15:43:22 +02002170{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002171 struct ieee80211_sub_if_data *sdata = rx->sdata;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002172 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002173 bool check_port_control = false;
2174 struct ethhdr *ehdr;
2175 int ret;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002176
Felix Fietkau4114fa22011-04-12 19:15:22 +02002177 *port_control = false;
Johannes Berg9bc383d2009-11-19 11:55:19 +01002178 if (ieee80211_has_a4(hdr->frame_control) &&
2179 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002180 return -1;
Johannes Berg9bc383d2009-11-19 11:55:19 +01002181
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002182 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2183 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2184
2185 if (!sdata->u.mgd.use_4addr)
2186 return -1;
2187 else
2188 check_port_control = true;
2189 }
2190
Johannes Berg9bc383d2009-11-19 11:55:19 +01002191 if (is_multicast_ether_addr(hdr->addr1) &&
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002192 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002193 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02002194
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002195 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
Felix Fietkau4114fa22011-04-12 19:15:22 +02002196 if (ret < 0)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002197 return ret;
2198
2199 ehdr = (struct ethhdr *) rx->skb->data;
Felix Fietkau4114fa22011-04-12 19:15:22 +02002200 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2201 *port_control = true;
2202 else if (check_port_control)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002203 return -1;
2204
2205 return 0;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002206}
Johannes Berg571ecf62007-07-27 15:43:22 +02002207
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002208/*
2209 * requires that rx->skb is a frame with ethernet header
2210 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07002211static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002212{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05302213 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002214 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2215 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2216
2217 /*
2218 * Allow EAPOL frames to us/the PAE group address regardless
2219 * of whether the frame was encrypted or not.
2220 */
Johannes Berga621fa42010-08-27 14:26:54 +03002221 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
Joe Perches3bc79452012-05-08 18:56:53 +00002222 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2223 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002224 return true;
2225
2226 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07002227 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002228 return false;
2229
2230 return true;
2231}
2232
2233/*
2234 * requires that rx->skb is a frame with ethernet header
2235 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002236static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01002237ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002238{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002239 struct ieee80211_sub_if_data *sdata = rx->sdata;
2240 struct net_device *dev = sdata->dev;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002241 struct sk_buff *skb, *xmit_skb;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002242 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2243 struct sta_info *dsta;
Johannes Berg571ecf62007-07-27 15:43:22 +02002244
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002245 skb = rx->skb;
2246 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02002247
Johannes Berg5a490512015-04-22 17:10:38 +02002248 ieee80211_rx_stats(dev, skb->len);
2249
Johannes Bergde8f18d2016-03-31 20:02:03 +03002250 if (rx->sta) {
2251 /* The seqno index has the same property as needed
2252 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2253 * for non-QoS-data frames. Here we know it's a data
2254 * frame, so count MSDUs.
2255 */
Johannes Berg0f9c5a62016-03-31 20:02:09 +03002256 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
Johannes Bergde8f18d2016-03-31 20:02:03 +03002257 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
Johannes Berg0f9c5a62016-03-31 20:02:09 +03002258 u64_stats_update_end(&rx->sta->rx_stats.syncp);
Johannes Bergde8f18d2016-03-31 20:02:03 +03002259 }
2260
Johannes Berg05c914f2008-09-11 00:01:58 +02002261 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2262 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02002263 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg9bc383d2009-11-19 11:55:19 +01002264 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002265 if (is_multicast_ether_addr(ehdr->h_dest)) {
2266 /*
2267 * send multicast frames both to higher layers in
2268 * local net stack and back to the wireless medium
2269 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002270 xmit_skb = skb_copy(skb, GFP_ATOMIC);
Joe Perchese87cc472012-05-13 21:56:26 +00002271 if (!xmit_skb)
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02002272 net_info_ratelimited("%s: failed to clone multicast frame\n",
Joe Perchese87cc472012-05-13 21:56:26 +00002273 dev->name);
Johannes Berg571ecf62007-07-27 15:43:22 +02002274 } else {
Johannes Bergabe60632009-11-25 17:46:18 +01002275 dsta = sta_info_get(sdata, skb->data);
2276 if (dsta) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002277 /*
2278 * The destination station is associated to
2279 * this AP (in this VLAN), so send the frame
2280 * directly to it and do not pass it to local
2281 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02002282 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002283 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02002284 skb = NULL;
2285 }
Johannes Berg571ecf62007-07-27 15:43:22 +02002286 }
2287 }
2288
Kalle Valo59d9cb02009-12-17 13:54:57 +01002289#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
Johannes Berg9e890a1f2013-12-04 09:16:31 +01002290 if (skb) {
2291 /* 'align' will only take the values 0 or 2 here since all
2292 * frames are required to be aligned to 2-byte boundaries
2293 * when being passed to mac80211; the code here works just
2294 * as well if that isn't true, but mac80211 assumes it can
2295 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
Johannes Bergd1c3a372009-01-07 00:26:10 +01002296 */
Johannes Berg9e890a1f2013-12-04 09:16:31 +01002297 int align;
2298
2299 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01002300 if (align) {
2301 if (WARN_ON(skb_headroom(skb) < 3)) {
2302 dev_kfree_skb(skb);
2303 skb = NULL;
2304 } else {
2305 u8 *data = skb->data;
Zhu Yi8ce0b582009-10-28 13:13:52 -07002306 size_t len = skb_headlen(skb);
2307 skb->data -= align;
2308 memmove(skb->data, data, len);
2309 skb_set_tail_pointer(skb, len);
Johannes Bergd1c3a372009-01-07 00:26:10 +01002310 }
2311 }
Johannes Berg9e890a1f2013-12-04 09:16:31 +01002312 }
Johannes Bergd1c3a372009-01-07 00:26:10 +01002313#endif
2314
Johannes Berg9e890a1f2013-12-04 09:16:31 +01002315 if (skb) {
2316 /* deliver to local stack */
2317 skb->protocol = eth_type_trans(skb, dev);
2318 memset(skb->cb, 0, sizeof(skb->cb));
Johannes Bergaf9f9b22015-06-11 16:02:32 +02002319 if (rx->napi)
2320 napi_gro_receive(rx->napi, skb);
Johannes Berg06d181a2014-02-04 20:51:09 +01002321 else
2322 netif_receive_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002323 }
2324
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002325 if (xmit_skb) {
Helmut Schaaaef6c922011-12-21 09:11:35 +01002326 /*
2327 * Send to wireless media and increase priority by 256 to
2328 * keep the received priority instead of reclassifying
2329 * the frame (see cfg80211_classify8021d).
2330 */
2331 xmit_skb->priority += 256;
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09002332 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002333 skb_reset_network_header(xmit_skb);
2334 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002335 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002336 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002337}
2338
Johannes Berg49461622008-06-30 15:10:45 +02002339static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002340ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002341{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002342 struct net_device *dev = rx->sdata->dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08002343 struct sk_buff *skb = rx->skb;
Harvey Harrison358c8d92008-07-15 18:44:13 -07002344 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2345 __le16 fc = hdr->frame_control;
Zhu Yieaf85ca2009-12-01 10:18:37 +08002346 struct sk_buff_head frame_list;
Johannes Berg554891e2010-09-24 12:38:25 +02002347 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg7f6990c2016-10-05 15:29:49 +02002348 struct ethhdr ethhdr;
Johannes Berge2b52272016-10-05 16:42:06 +02002349 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002350
Harvey Harrison358c8d92008-07-15 18:44:13 -07002351 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002352 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002353
Harvey Harrison358c8d92008-07-15 18:44:13 -07002354 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002355 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002356
Johannes Berg554891e2010-09-24 12:38:25 +02002357 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002358 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002359
Johannes Bergea720932016-10-05 10:14:42 +02002360 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2361 switch (rx->sdata->vif.type) {
2362 case NL80211_IFTYPE_AP_VLAN:
2363 if (!rx->sdata->u.vlan.sta)
2364 return RX_DROP_UNUSABLE;
2365 break;
2366 case NL80211_IFTYPE_STATION:
2367 if (!rx->sdata->u.mgd.use_4addr)
2368 return RX_DROP_UNUSABLE;
2369 break;
2370 default:
2371 return RX_DROP_UNUSABLE;
2372 }
Johannes Berge2b52272016-10-05 16:42:06 +02002373 check_da = NULL;
2374 check_sa = NULL;
2375 } else switch (rx->sdata->vif.type) {
2376 case NL80211_IFTYPE_AP:
2377 case NL80211_IFTYPE_AP_VLAN:
2378 check_da = NULL;
2379 break;
2380 case NL80211_IFTYPE_STATION:
2381 if (!rx->sta ||
2382 !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2383 check_sa = NULL;
2384 break;
2385 case NL80211_IFTYPE_MESH_POINT:
2386 check_sa = NULL;
2387 break;
2388 default:
2389 break;
Johannes Bergea720932016-10-05 10:14:42 +02002390 }
Zhu Yieaf85ca2009-12-01 10:18:37 +08002391
Johannes Bergea720932016-10-05 10:14:42 +02002392 if (is_multicast_ether_addr(hdr->addr1))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002393 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002394
2395 skb->dev = dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08002396 __skb_queue_head_init(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002397
Johannes Berg7f6990c2016-10-05 15:29:49 +02002398 if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2399 rx->sdata->vif.addr,
2400 rx->sdata->vif.type))
2401 return RX_DROP_UNUSABLE;
2402
Zhu Yieaf85ca2009-12-01 10:18:37 +08002403 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2404 rx->sdata->vif.type,
Johannes Berg8b935ee2016-10-05 16:17:01 +02002405 rx->local->hw.extra_tx_headroom,
Johannes Berge2b52272016-10-05 16:42:06 +02002406 check_da, check_sa);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002407
Zhu Yieaf85ca2009-12-01 10:18:37 +08002408 while (!skb_queue_empty(&frame_list)) {
2409 rx->skb = __skb_dequeue(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002410
Harvey Harrison358c8d92008-07-15 18:44:13 -07002411 if (!ieee80211_frame_allowed(rx, fc)) {
Zhu Yieaf85ca2009-12-01 10:18:37 +08002412 dev_kfree_skb(rx->skb);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002413 continue;
2414 }
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002415
2416 ieee80211_deliver_skb(rx);
2417 }
2418
Johannes Berg9ae54c82008-01-31 19:48:20 +01002419 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002420}
2421
Ingo Molnarbf94e172008-10-12 23:51:38 -07002422#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02002423static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002424ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2425{
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002426 struct ieee80211_hdr *fwd_hdr, *hdr;
2427 struct ieee80211_tx_info *info;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002428 struct ieee80211s_hdr *mesh_hdr;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002429 struct sk_buff *skb = rx->skb, *fwd_skb;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002430 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002431 struct ieee80211_sub_if_data *sdata = rx->sdata;
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002432 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Michal Kaziorcf440122016-01-25 14:43:24 +01002433 u16 ac, q, hdrlen;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002434
2435 hdr = (struct ieee80211_hdr *) skb->data;
2436 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg9b395bc2012-10-26 00:36:40 +02002437
2438 /* make sure fixed part of mesh header is there, also checks skb len */
2439 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2440 return RX_DROP_MONITOR;
2441
2442 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2443
2444 /* make sure full mesh header is there, also checks skb len */
2445 if (!pskb_may_pull(rx->skb,
2446 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2447 return RX_DROP_MONITOR;
2448
2449 /* reload pointers */
2450 hdr = (struct ieee80211_hdr *) skb->data;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002451 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2452
Bob Copelandd0c22112015-03-02 14:28:52 -05002453 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2454 return RX_DROP_MONITOR;
2455
Thomas Pedersen2157fdd2011-09-01 12:32:14 -07002456 /* frame is in RMC, don't forward */
2457 if (ieee80211_is_data(hdr->frame_control) &&
2458 is_multicast_ether_addr(hdr->addr1) &&
Johannes Bergbf7cd942013-02-15 14:40:31 +01002459 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
Thomas Pedersen2157fdd2011-09-01 12:32:14 -07002460 return RX_DROP_MONITOR;
2461
Johannes Berg5c900672015-04-22 14:48:34 +02002462 if (!ieee80211_is_data(hdr->frame_control))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002463 return RX_CONTINUE;
2464
2465 if (!mesh_hdr->ttl)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002466 return RX_DROP_MONITOR;
2467
Javier Cardona43b7b312009-10-15 18:10:51 -07002468 if (mesh_hdr->flags & MESH_FLAGS_AE) {
YanBo79617de2008-09-22 13:30:32 +08002469 struct mesh_path *mppath;
Javier Cardona43b7b312009-10-15 18:10:51 -07002470 char *proxied_addr;
2471 char *mpp_addr;
2472
2473 if (is_multicast_ether_addr(hdr->addr1)) {
2474 mpp_addr = hdr->addr3;
2475 proxied_addr = mesh_hdr->eaddr1;
Rajkumar Manoharan6568f8f2017-05-14 21:41:55 -07002476 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2477 MESH_FLAGS_AE_A5_A6) {
Johannes Berg9b395bc2012-10-26 00:36:40 +02002478 /* has_a4 already checked in ieee80211_rx_mesh_check */
Javier Cardona43b7b312009-10-15 18:10:51 -07002479 mpp_addr = hdr->addr4;
2480 proxied_addr = mesh_hdr->eaddr2;
Johannes Berg9b395bc2012-10-26 00:36:40 +02002481 } else {
2482 return RX_DROP_MONITOR;
Javier Cardona43b7b312009-10-15 18:10:51 -07002483 }
YanBo79617de2008-09-22 13:30:32 +08002484
YanBo79617de2008-09-22 13:30:32 +08002485 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +01002486 mppath = mpp_path_lookup(sdata, proxied_addr);
YanBo79617de2008-09-22 13:30:32 +08002487 if (!mppath) {
Johannes Bergbf7cd942013-02-15 14:40:31 +01002488 mpp_path_add(sdata, proxied_addr, mpp_addr);
YanBo79617de2008-09-22 13:30:32 +08002489 } else {
2490 spin_lock_bh(&mppath->state_lock);
Joe Perchesb203ca32012-05-08 18:56:52 +00002491 if (!ether_addr_equal(mppath->mpp, mpp_addr))
Javier Cardona43b7b312009-10-15 18:10:51 -07002492 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
Henning Roggeab1c7902016-02-03 13:58:37 +01002493 mppath->exp_time = jiffies;
YanBo79617de2008-09-22 13:30:32 +08002494 spin_unlock_bh(&mppath->state_lock);
2495 }
2496 rcu_read_unlock();
2497 }
2498
Javier Cardona3c5772a2009-08-10 12:15:48 -07002499 /* Frame has reached destination. Don't forward */
2500 if (!is_multicast_ether_addr(hdr->addr1) &&
Joe Perchesb203ca32012-05-08 18:56:52 +00002501 ether_addr_equal(sdata->vif.addr, hdr->addr3))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002502 return RX_CONTINUE;
2503
Michal Kaziorcf440122016-01-25 14:43:24 +01002504 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2505 q = sdata->vif.hw_queue[ac];
Thomas Pedersend3c15972011-11-24 17:15:23 -08002506 if (ieee80211_queue_stopped(&local->hw, q)) {
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002507 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
Thomas Pedersend3c15972011-11-24 17:15:23 -08002508 return RX_DROP_MONITOR;
2509 }
2510 skb_set_queue_mapping(skb, q);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002511
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002512 if (!--mesh_hdr->ttl) {
Bob Copelandd0038e42019-01-17 16:32:42 -05002513 if (!is_multicast_ether_addr(hdr->addr1))
2514 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2515 dropped_frames_ttl);
Javier Cardona2ac64cd2012-10-24 12:43:31 -07002516 goto out;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002517 }
2518
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +08002519 if (!ifmsh->mshcfg.dot11MeshForwarding)
2520 goto out;
2521
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002522 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2523 if (!fwd_skb) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02002524 net_info_ratelimited("%s: failed to clone mesh frame\n",
Joe Perchese87cc472012-05-13 21:56:26 +00002525 sdata->name);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002526 goto out;
2527 }
2528
2529 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
Thomas Pedersen9d6d6f42013-04-08 11:06:12 -07002530 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002531 info = IEEE80211_SKB_CB(fwd_skb);
2532 memset(info, 0, sizeof(*info));
2533 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2534 info->control.vif = &rx->sdata->vif;
2535 info->control.jiffies = jiffies;
2536 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2537 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2538 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
Marco Porsch3f52b7e2013-01-30 18:14:08 +01002539 /* update power mode indication when forwarding */
2540 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
Johannes Bergbf7cd942013-02-15 14:40:31 +01002541 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
Marco Porsch3f52b7e2013-01-30 18:14:08 +01002542 /* mesh power mode flags updated in mesh_nexthop_lookup */
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002543 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2544 } else {
2545 /* unable to resolve next hop */
Johannes Bergbf7cd942013-02-15 14:40:31 +01002546 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +08002547 fwd_hdr->addr3, 0,
2548 WLAN_REASON_MESH_PATH_NOFORWARD,
2549 fwd_hdr->addr2);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002550 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
Jesper Juhl74b8cc32012-01-14 21:52:17 +01002551 kfree_skb(fwd_skb);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002552 return RX_DROP_MONITOR;
2553 }
2554
2555 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2556 ieee80211_add_pending_skb(local, fwd_skb);
Johannes Bergb51aff02010-12-22 10:15:07 +01002557 out:
Johannes Bergdf140462015-04-22 14:40:58 +02002558 if (is_multicast_ether_addr(hdr->addr1))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002559 return RX_CONTINUE;
Johannes Bergdf140462015-04-22 14:40:58 +02002560 return RX_DROP_MONITOR;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002561}
Ingo Molnarbf94e172008-10-12 23:51:38 -07002562#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002563
2564static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002565ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002566{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002567 struct ieee80211_sub_if_data *sdata = rx->sdata;
Vivek Natarajane15276a2010-02-08 17:47:01 +05302568 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002569 struct net_device *dev = sdata->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07002570 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2571 __le16 fc = hdr->frame_control;
Felix Fietkau4114fa22011-04-12 19:15:22 +02002572 bool port_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002573 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002574
Harvey Harrison358c8d92008-07-15 18:44:13 -07002575 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002576 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002577
Harvey Harrison358c8d92008-07-15 18:44:13 -07002578 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002579 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002580
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002581 /*
Johannes Berge7f4a942011-11-04 11:18:20 +01002582 * Send unexpected-4addr-frame event to hostapd. For older versions,
2583 * also drop the frame to cooked monitor interfaces.
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002584 */
2585 if (ieee80211_has_a4(hdr->frame_control) &&
Johannes Berge7f4a942011-11-04 11:18:20 +01002586 sdata->vif.type == NL80211_IFTYPE_AP) {
2587 if (rx->sta &&
2588 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2589 cfg80211_rx_unexpected_4addr_frame(
2590 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002591 return RX_DROP_MONITOR;
Johannes Berge7f4a942011-11-04 11:18:20 +01002592 }
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002593
Felix Fietkau4114fa22011-04-12 19:15:22 +02002594 err = __ieee80211_data_to_8023(rx, &port_control);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002595 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002596 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002597
Harvey Harrison358c8d92008-07-15 18:44:13 -07002598 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002599 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002600
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02002601 /* directly handle TDLS channel switch requests/responses */
2602 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2603 cpu_to_be16(ETH_P_TDLS))) {
2604 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2605
2606 if (pskb_may_pull(rx->skb,
2607 offsetof(struct ieee80211_tdls_data, u)) &&
2608 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2609 tf->category == WLAN_CATEGORY_TDLS &&
2610 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2611 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
Arik Nemtsovc8ff71e2015-07-08 15:41:45 +03002612 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2613 schedule_work(&local->tdls_chsw_work);
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02002614 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02002615 rx->sta->rx_stats.packets++;
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02002616
2617 return RX_QUEUED;
2618 }
2619 }
2620
Felix Fietkau4114fa22011-04-12 19:15:22 +02002621 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2622 unlikely(port_control) && sdata->bss) {
2623 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2624 u.ap);
2625 dev = sdata->dev;
2626 rx->sdata = sdata;
2627 }
2628
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002629 rx->skb->dev = dev;
2630
Johannes Berg602fae42016-03-17 15:02:52 +02002631 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2632 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
Rajkumar Manoharan8c99f692011-02-02 22:57:53 +05302633 !is_multicast_ether_addr(
2634 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2635 (!local->scanning &&
Johannes Berg602fae42016-03-17 15:02:52 +02002636 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2637 mod_timer(&local->dynamic_ps_timer, jiffies +
2638 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
Vivek Natarajane15276a2010-02-08 17:47:01 +05302639
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002640 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02002641
Johannes Berg9ae54c82008-01-31 19:48:20 +01002642 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002643}
2644
Johannes Berg49461622008-06-30 15:10:45 +02002645static ieee80211_rx_result debug_noinline
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002646ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
Ron Rindjunsky71364712007-12-25 17:00:36 +02002647{
Ron Rindjunsky71364712007-12-25 17:00:36 +02002648 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002649 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002650 struct tid_ampdu_rx *tid_agg_rx;
2651 u16 start_seq_num;
2652 u16 tid;
2653
Harvey Harrisona7767f92008-07-02 16:30:51 -07002654 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002655 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002656
Harvey Harrisona7767f92008-07-02 16:30:51 -07002657 if (ieee80211_is_back_req(bar->frame_control)) {
Johannes Berg8ae59772010-05-30 14:52:58 +02002658 struct {
2659 __le16 control, start_seq_num;
2660 } __packed bar_data;
Emmanuel Grumbach63822462015-04-20 22:53:37 +03002661 struct ieee80211_event event = {
2662 .type = BAR_RX_EVENT,
2663 };
Johannes Berg8ae59772010-05-30 14:52:58 +02002664
Ron Rindjunsky71364712007-12-25 17:00:36 +02002665 if (!rx->sta)
Johannes Berga02ae752009-11-16 12:00:40 +01002666 return RX_DROP_MONITOR;
Johannes Berg8ae59772010-05-30 14:52:58 +02002667
2668 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2669 &bar_data, sizeof(bar_data)))
2670 return RX_DROP_MONITOR;
2671
Johannes Berg8ae59772010-05-30 14:52:58 +02002672 tid = le16_to_cpu(bar_data.control) >> 12;
Johannes Berga87f7362010-06-10 10:21:38 +02002673
Johannes Berg53f24972016-08-29 23:25:19 +03002674 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2675 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2676 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2677 WLAN_BACK_RECIPIENT,
2678 WLAN_REASON_QSTA_REQUIRE_SETUP);
2679
Johannes Berga87f7362010-06-10 10:21:38 +02002680 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2681 if (!tid_agg_rx)
Johannes Berga02ae752009-11-16 12:00:40 +01002682 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002683
Johannes Berg8ae59772010-05-30 14:52:58 +02002684 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
Emmanuel Grumbach63822462015-04-20 22:53:37 +03002685 event.u.ba.tid = tid;
2686 event.u.ba.ssn = start_seq_num;
2687 event.u.ba.sta = &rx->sta->sta;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002688
2689 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01002690 if (tid_agg_rx->timeout)
2691 mod_timer(&tid_agg_rx->session_timer,
2692 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02002693
Johannes Bergdd318572010-11-29 11:09:16 +01002694 spin_lock(&tid_agg_rx->reorder_lock);
Johannes Berga02ae752009-11-16 12:00:40 +01002695 /* release stored frames up to start of BAR */
Johannes Bergd3b2fb52012-06-22 12:48:38 +02002696 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002697 start_seq_num, frames);
Johannes Bergdd318572010-11-29 11:09:16 +01002698 spin_unlock(&tid_agg_rx->reorder_lock);
2699
Emmanuel Grumbach63822462015-04-20 22:53:37 +03002700 drv_event_callback(rx->local, rx->sdata, &event);
2701
Johannes Berga02ae752009-11-16 12:00:40 +01002702 kfree_skb(skb);
2703 return RX_QUEUED;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002704 }
2705
Johannes Berg08daeca2010-05-30 14:53:43 +02002706 /*
2707 * After this point, we only want management frames,
2708 * so we can drop all remaining control frames to
2709 * cooked monitor interfaces.
2710 */
2711 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002712}
2713
Jouni Malinenf4f727a2009-01-10 11:46:53 +02002714static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2715 struct ieee80211_mgmt *mgmt,
2716 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02002717{
2718 struct ieee80211_local *local = sdata->local;
2719 struct sk_buff *skb;
2720 struct ieee80211_mgmt *resp;
2721
Joe Perchesb203ca32012-05-08 18:56:52 +00002722 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
Jouni Malinenfea14732009-01-08 13:32:06 +02002723 /* Not to own unicast address */
2724 return;
2725 }
2726
Joe Perchesb203ca32012-05-08 18:56:52 +00002727 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2728 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
Johannes Berg77fdaa12009-07-07 03:45:17 +02002729 /* Not from the current AP or not associated yet. */
Jouni Malinenfea14732009-01-08 13:32:06 +02002730 return;
2731 }
2732
2733 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2734 /* Too short SA Query request frame */
2735 return;
2736 }
2737
2738 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2739 if (skb == NULL)
2740 return;
2741
2742 skb_reserve(skb, local->hw.extra_tx_headroom);
2743 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2744 memset(resp, 0, 24);
2745 memcpy(resp->da, mgmt->sa, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01002746 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01002747 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02002748 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2749 IEEE80211_STYPE_ACTION);
2750 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2751 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2752 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2753 memcpy(resp->u.action.u.sa_query.trans_id,
2754 mgmt->u.action.u.sa_query.trans_id,
2755 WLAN_SA_QUERY_TR_ID_LEN);
2756
Johannes Berg62ae67b2009-11-18 18:42:05 +01002757 ieee80211_tx_skb(sdata, skb);
Jouni Malinenfea14732009-01-08 13:32:06 +02002758}
2759
Johannes Berg49461622008-06-30 15:10:45 +02002760static ieee80211_rx_result debug_noinline
Johannes Berg2e161f72010-08-12 15:38:38 +02002761ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2762{
2763 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002764 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002765
2766 /*
2767 * From here on, look only at management frames.
2768 * Data and control frames are already handled,
2769 * and unknown (reserved) frames are useless.
2770 */
2771 if (rx->skb->len < 24)
2772 return RX_DROP_MONITOR;
2773
2774 if (!ieee80211_is_mgmt(mgmt->frame_control))
2775 return RX_DROP_MONITOR;
2776
Johannes Bergee971922011-11-04 11:18:18 +01002777 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2778 ieee80211_is_beacon(mgmt->frame_control) &&
2779 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
Johannes Berg804483e2012-03-05 22:18:41 +01002780 int sig = 0;
2781
Johannes Berg30686bf2015-06-02 21:39:54 +02002782 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
Johannes Berg804483e2012-03-05 22:18:41 +01002783 sig = status->signal;
2784
Johannes Bergee971922011-11-04 11:18:18 +01002785 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2786 rx->skb->data, rx->skb->len,
Ben Greear37c73b52012-10-26 14:49:25 -07002787 status->freq, sig);
Johannes Bergee971922011-11-04 11:18:18 +01002788 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2789 }
2790
Johannes Berg2e161f72010-08-12 15:38:38 +02002791 if (ieee80211_drop_unencrypted_mgmt(rx))
2792 return RX_DROP_UNUSABLE;
2793
2794 return RX_CONTINUE;
2795}
2796
2797static ieee80211_rx_result debug_noinline
Johannes Bergde1ede72008-09-09 14:42:50 +02002798ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2799{
2800 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002801 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergde1ede72008-09-09 14:42:50 +02002802 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002803 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergde1ede72008-09-09 14:42:50 +02002804 int len = rx->skb->len;
2805
2806 if (!ieee80211_is_action(mgmt->frame_control))
2807 return RX_CONTINUE;
2808
Jouni Malinen026331c2010-02-15 12:53:10 +02002809 /* drop too small frames */
2810 if (len < IEEE80211_MIN_ACTION_SIZE)
2811 return RX_DROP_UNUSABLE;
2812
Marco Porsch815b8092012-12-05 15:04:26 -08002813 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002814 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2815 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
Johannes Berg84040802010-02-15 12:46:39 +02002816 return RX_DROP_UNUSABLE;
Johannes Bergde1ede72008-09-09 14:42:50 +02002817
Johannes Bergde1ede72008-09-09 14:42:50 +02002818 switch (mgmt->u.action.category) {
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002819 case WLAN_CATEGORY_HT:
2820 /* reject HT action frames from stations not supporting HT */
2821 if (!rx->sta->sta.ht_cap.ht_supported)
2822 goto invalid;
2823
2824 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2825 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2826 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2827 sdata->vif.type != NL80211_IFTYPE_AP &&
2828 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2829 break;
2830
Johannes Bergec61cd62012-12-28 12:12:10 +01002831 /* verify action & smps_control/chanwidth are present */
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002832 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2833 goto invalid;
2834
2835 switch (mgmt->u.action.u.ht_smps.action) {
2836 case WLAN_HT_ACTION_SMPS: {
2837 struct ieee80211_supported_band *sband;
Johannes Bergaf0ed692013-02-12 14:21:00 +01002838 enum ieee80211_smps_mode smps_mode;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002839
2840 /* convert to HT capability */
2841 switch (mgmt->u.action.u.ht_smps.smps_control) {
2842 case WLAN_HT_SMPS_CONTROL_DISABLED:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002843 smps_mode = IEEE80211_SMPS_OFF;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002844 break;
2845 case WLAN_HT_SMPS_CONTROL_STATIC:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002846 smps_mode = IEEE80211_SMPS_STATIC;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002847 break;
2848 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002849 smps_mode = IEEE80211_SMPS_DYNAMIC;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002850 break;
2851 default:
2852 goto invalid;
2853 }
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002854
2855 /* if no change do nothing */
Johannes Bergaf0ed692013-02-12 14:21:00 +01002856 if (rx->sta->sta.smps_mode == smps_mode)
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002857 goto handled;
Johannes Bergaf0ed692013-02-12 14:21:00 +01002858 rx->sta->sta.smps_mode = smps_mode;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002859
2860 sband = rx->local->hw.wiphy->bands[status->band];
2861
Johannes Berg64f68e52012-03-28 10:58:37 +02002862 rate_control_rate_update(local, sband, rx->sta,
2863 IEEE80211_RC_SMPS_CHANGED);
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002864 goto handled;
2865 }
Johannes Bergec61cd62012-12-28 12:12:10 +01002866 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2867 struct ieee80211_supported_band *sband;
2868 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
Eliad Peller1c45c5c2014-12-14 11:05:51 +02002869 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
Johannes Bergec61cd62012-12-28 12:12:10 +01002870
2871 /* If it doesn't support 40 MHz it can't change ... */
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002872 if (!(rx->sta->sta.ht_cap.cap &
2873 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
Johannes Bergec61cd62012-12-28 12:12:10 +01002874 goto handled;
2875
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002876 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
Eliad Peller1c45c5c2014-12-14 11:05:51 +02002877 max_bw = IEEE80211_STA_RX_BW_20;
Johannes Bergec61cd62012-12-28 12:12:10 +01002878 else
Eliad Peller1c45c5c2014-12-14 11:05:51 +02002879 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2880
2881 /* set cur_max_bandwidth and recalc sta bw */
2882 rx->sta->cur_max_bandwidth = max_bw;
2883 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002884
2885 if (rx->sta->sta.bandwidth == new_bw)
2886 goto handled;
Johannes Bergec61cd62012-12-28 12:12:10 +01002887
Eliad Peller1c45c5c2014-12-14 11:05:51 +02002888 rx->sta->sta.bandwidth = new_bw;
Johannes Bergec61cd62012-12-28 12:12:10 +01002889 sband = rx->local->hw.wiphy->bands[status->band];
2890
2891 rate_control_rate_update(local, sband, rx->sta,
2892 IEEE80211_RC_BW_CHANGED);
2893 goto handled;
2894 }
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002895 default:
2896 goto invalid;
2897 }
2898
2899 break;
Johannes Berg1b3a2e42013-03-26 15:17:18 +01002900 case WLAN_CATEGORY_PUBLIC:
2901 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2902 goto invalid;
2903 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2904 break;
2905 if (!rx->sta)
2906 break;
2907 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2908 break;
2909 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2910 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2911 break;
2912 if (len < offsetof(struct ieee80211_mgmt,
2913 u.action.u.ext_chan_switch.variable))
2914 goto invalid;
2915 goto queue;
Johannes Berg0af83d32012-12-27 18:55:36 +01002916 case WLAN_CATEGORY_VHT:
2917 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2918 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2919 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2920 sdata->vif.type != NL80211_IFTYPE_AP &&
2921 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2922 break;
2923
2924 /* verify action code is present */
2925 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2926 goto invalid;
2927
2928 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2929 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
Johannes Berg0af83d32012-12-27 18:55:36 +01002930 /* verify opmode is present */
2931 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2932 goto invalid;
Johannes Berg6130fac2016-10-20 08:52:50 +02002933 goto queue;
Johannes Berg0af83d32012-12-27 18:55:36 +01002934 }
Sara Sharon23a1f8d2015-12-08 16:04:31 +02002935 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2936 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2937 goto invalid;
2938 goto queue;
2939 }
Johannes Berg0af83d32012-12-27 18:55:36 +01002940 default:
2941 break;
2942 }
2943 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002944 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01002945 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
Thomas Pedersenae2772b2011-10-26 14:47:29 -07002946 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
Johannes Berg8abd3f92009-02-10 21:25:47 +01002947 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
Alexander Simon13c40c52011-11-30 16:56:34 +01002948 sdata->vif.type != NL80211_IFTYPE_AP &&
2949 sdata->vif.type != NL80211_IFTYPE_ADHOC)
Johannes Berg84040802010-02-15 12:46:39 +02002950 break;
Johannes Berg8abd3f92009-02-10 21:25:47 +01002951
Jouni Malinen026331c2010-02-15 12:53:10 +02002952 /* verify action_code is present */
2953 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2954 break;
2955
Johannes Bergde1ede72008-09-09 14:42:50 +02002956 switch (mgmt->u.action.u.addba_req.action_code) {
2957 case WLAN_ACTION_ADDBA_REQ:
2958 if (len < (IEEE80211_MIN_ACTION_SIZE +
2959 sizeof(mgmt->u.action.u.addba_req)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002960 goto invalid;
2961 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002962 case WLAN_ACTION_ADDBA_RESP:
2963 if (len < (IEEE80211_MIN_ACTION_SIZE +
2964 sizeof(mgmt->u.action.u.addba_resp)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002965 goto invalid;
2966 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002967 case WLAN_ACTION_DELBA:
2968 if (len < (IEEE80211_MIN_ACTION_SIZE +
2969 sizeof(mgmt->u.action.u.delba)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002970 goto invalid;
2971 break;
2972 default:
2973 goto invalid;
Johannes Bergde1ede72008-09-09 14:42:50 +02002974 }
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002975
Johannes Berg8b58ff82010-06-10 10:21:51 +02002976 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002977 case WLAN_CATEGORY_SPECTRUM_MGMT:
Jouni Malinen026331c2010-02-15 12:53:10 +02002978 /* verify action_code is present */
2979 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2980 break;
2981
Johannes Berg39192c02008-09-09 14:49:03 +02002982 switch (mgmt->u.action.u.measurement.action_code) {
2983 case WLAN_ACTION_SPCT_MSR_REQ:
Johannes Berg57fbcce2016-04-12 15:56:15 +02002984 if (status->band != NL80211_BAND_5GHZ)
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002985 break;
2986
Johannes Berg39192c02008-09-09 14:49:03 +02002987 if (len < (IEEE80211_MIN_ACTION_SIZE +
2988 sizeof(mgmt->u.action.u.measurement)))
Johannes Berg84040802010-02-15 12:46:39 +02002989 break;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002990
Johannes Bergcc32abd2009-05-15 11:52:31 +02002991 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002992 break;
Johannes Bergcc32abd2009-05-15 11:52:31 +02002993
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002994 ieee80211_process_measurement_req(sdata, mgmt, len);
2995 goto handled;
2996 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2997 u8 *bssid;
2998 if (len < (IEEE80211_MIN_ACTION_SIZE +
2999 sizeof(mgmt->u.action.u.chan_switch)))
3000 break;
3001
3002 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07003003 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3004 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02003005 break;
3006
3007 if (sdata->vif.type == NL80211_IFTYPE_STATION)
3008 bssid = sdata->u.mgd.bssid;
3009 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3010 bssid = sdata->u.ibss.bssid;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07003011 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3012 bssid = mgmt->sa;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02003013 else
3014 break;
3015
3016 if (!ether_addr_equal(mgmt->bssid, bssid))
Johannes Berg84040802010-02-15 12:46:39 +02003017 break;
Sujithc481ec92009-01-06 09:28:37 +05303018
Johannes Berg8b58ff82010-06-10 10:21:51 +02003019 goto queue;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02003020 }
Johannes Berg39192c02008-09-09 14:49:03 +02003021 }
3022 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02003023 case WLAN_CATEGORY_SA_QUERY:
3024 if (len < (IEEE80211_MIN_ACTION_SIZE +
3025 sizeof(mgmt->u.action.u.sa_query)))
Johannes Berg84040802010-02-15 12:46:39 +02003026 break;
3027
Jouni Malinenfea14732009-01-08 13:32:06 +02003028 switch (mgmt->u.action.u.sa_query.action) {
3029 case WLAN_ACTION_SA_QUERY_REQUEST:
3030 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02003031 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02003032 ieee80211_process_sa_query_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02003033 goto handled;
Jouni Malinenfea14732009-01-08 13:32:06 +02003034 }
3035 break;
Thomas Pedersen8db09852011-08-12 20:01:00 -07003036 case WLAN_CATEGORY_SELF_PROTECTED:
Johannes Berg9b395bc2012-10-26 00:36:40 +02003037 if (len < (IEEE80211_MIN_ACTION_SIZE +
3038 sizeof(mgmt->u.action.u.self_prot.action_code)))
3039 break;
3040
Thomas Pedersen8db09852011-08-12 20:01:00 -07003041 switch (mgmt->u.action.u.self_prot.action_code) {
3042 case WLAN_SP_MESH_PEERING_OPEN:
3043 case WLAN_SP_MESH_PEERING_CLOSE:
3044 case WLAN_SP_MESH_PEERING_CONFIRM:
3045 if (!ieee80211_vif_is_mesh(&sdata->vif))
3046 goto invalid;
Thomas Pedersena6dad6a2013-03-04 13:06:12 -08003047 if (sdata->u.mesh.user_mpm)
Thomas Pedersen8db09852011-08-12 20:01:00 -07003048 /* userspace handles this frame */
3049 break;
3050 goto queue;
3051 case WLAN_SP_MGK_INFORM:
3052 case WLAN_SP_MGK_ACK:
3053 if (!ieee80211_vif_is_mesh(&sdata->vif))
3054 goto invalid;
3055 break;
3056 }
3057 break;
Javier Cardonad3aaec8a2011-05-03 16:57:09 -07003058 case WLAN_CATEGORY_MESH_ACTION:
Johannes Berg9b395bc2012-10-26 00:36:40 +02003059 if (len < (IEEE80211_MIN_ACTION_SIZE +
3060 sizeof(mgmt->u.action.u.mesh_action.action_code)))
3061 break;
3062
Johannes Berg77a121c2010-06-10 10:21:34 +02003063 if (!ieee80211_vif_is_mesh(&sdata->vif))
3064 break;
Thomas Pedersen25d49e42011-08-11 19:35:15 -07003065 if (mesh_action_is_path_sel(mgmt) &&
Johannes Berg1df332e2012-10-26 00:09:11 +02003066 !mesh_path_sel_is_hwmp(sdata))
Javier Cardonac7108a72010-12-16 17:37:50 -08003067 break;
3068 goto queue;
Johannes Berg84040802010-02-15 12:46:39 +02003069 }
Jouni Malinen026331c2010-02-15 12:53:10 +02003070
Johannes Berg2e161f72010-08-12 15:38:38 +02003071 return RX_CONTINUE;
3072
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02003073 invalid:
Johannes Berg554891e2010-09-24 12:38:25 +02003074 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
Johannes Berg2e161f72010-08-12 15:38:38 +02003075 /* will return in the next handlers */
3076 return RX_CONTINUE;
3077
3078 handled:
3079 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02003080 rx->sta->rx_stats.packets++;
Johannes Berg2e161f72010-08-12 15:38:38 +02003081 dev_kfree_skb(rx->skb);
3082 return RX_QUEUED;
3083
3084 queue:
3085 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3086 skb_queue_tail(&sdata->skb_queue, rx->skb);
3087 ieee80211_queue_work(&local->hw, &sdata->work);
3088 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02003089 rx->sta->rx_stats.packets++;
Johannes Berg2e161f72010-08-12 15:38:38 +02003090 return RX_QUEUED;
3091}
3092
3093static ieee80211_rx_result debug_noinline
3094ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3095{
Johannes Berg554891e2010-09-24 12:38:25 +02003096 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg804483e2012-03-05 22:18:41 +01003097 int sig = 0;
Johannes Berg2e161f72010-08-12 15:38:38 +02003098
3099 /* skip known-bad action frames and return them in the next handler */
Johannes Berg554891e2010-09-24 12:38:25 +02003100 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
Johannes Berg2e161f72010-08-12 15:38:38 +02003101 return RX_CONTINUE;
Felix Fietkaud7907442010-01-07 20:23:53 +01003102
Jouni Malinen026331c2010-02-15 12:53:10 +02003103 /*
3104 * Getting here means the kernel doesn't know how to handle
3105 * it, but maybe userspace does ... include returned frames
3106 * so userspace can register for those to know whether ones
3107 * it transmitted were processed or returned.
3108 */
Jouni Malinen026331c2010-02-15 12:53:10 +02003109
Johannes Berg30686bf2015-06-02 21:39:54 +02003110 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
Johannes Berg804483e2012-03-05 22:18:41 +01003111 sig = status->signal;
3112
Johannes Berg71bbc992012-06-15 15:30:18 +02003113 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
Vladimir Kondratiev970fdfa2014-08-11 03:29:57 -07003114 rx->skb->data, rx->skb->len, 0)) {
Johannes Berg2e161f72010-08-12 15:38:38 +02003115 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02003116 rx->sta->rx_stats.packets++;
Johannes Berg2e161f72010-08-12 15:38:38 +02003117 dev_kfree_skb(rx->skb);
3118 return RX_QUEUED;
3119 }
3120
Johannes Berg2e161f72010-08-12 15:38:38 +02003121 return RX_CONTINUE;
3122}
3123
3124static ieee80211_rx_result debug_noinline
3125ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3126{
3127 struct ieee80211_local *local = rx->local;
3128 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3129 struct sk_buff *nskb;
3130 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02003131 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02003132
3133 if (!ieee80211_is_action(mgmt->frame_control))
3134 return RX_CONTINUE;
3135
3136 /*
3137 * For AP mode, hostapd is responsible for handling any action
3138 * frames that we didn't handle, including returning unknown
3139 * ones. For all other modes we will return them to the sender,
3140 * setting the 0x80 bit in the action category, as required by
Johannes Berg4b5ebcc2012-06-27 15:38:56 +02003141 * 802.11-2012 9.24.4.
Johannes Berg2e161f72010-08-12 15:38:38 +02003142 * Newer versions of hostapd shall also use the management frame
3143 * registration mechanisms, but older ones still use cooked
3144 * monitor interfaces so push all frames there.
3145 */
Johannes Berg554891e2010-09-24 12:38:25 +02003146 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
Johannes Berg2e161f72010-08-12 15:38:38 +02003147 (sdata->vif.type == NL80211_IFTYPE_AP ||
3148 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3149 return RX_DROP_MONITOR;
Jouni Malinen026331c2010-02-15 12:53:10 +02003150
Johannes Berg4b5ebcc2012-06-27 15:38:56 +02003151 if (is_multicast_ether_addr(mgmt->da))
3152 return RX_DROP_MONITOR;
3153
Johannes Berg84040802010-02-15 12:46:39 +02003154 /* do not return rejected action frames */
3155 if (mgmt->u.action.category & 0x80)
3156 return RX_DROP_UNUSABLE;
3157
3158 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3159 GFP_ATOMIC);
3160 if (nskb) {
John W. Linville292b4df2010-06-24 11:13:56 -04003161 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
Johannes Berg84040802010-02-15 12:46:39 +02003162
John W. Linville292b4df2010-06-24 11:13:56 -04003163 nmgmt->u.action.category |= 0x80;
3164 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3165 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
Johannes Berg84040802010-02-15 12:46:39 +02003166
3167 memset(nskb->cb, 0, sizeof(nskb->cb));
3168
Johannes Berg07e5a5f2013-03-07 13:22:05 +01003169 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3170 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3171
3172 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3173 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3174 IEEE80211_TX_CTL_NO_CCK_RATE;
Johannes Berg30686bf2015-06-02 21:39:54 +02003175 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
Johannes Berg07e5a5f2013-03-07 13:22:05 +01003176 info->hw_queue =
3177 local->hw.offchannel_tx_hw_queue;
3178 }
3179
3180 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3181 status->band);
Johannes Bergde1ede72008-09-09 14:42:50 +02003182 }
Johannes Berg39192c02008-09-09 14:49:03 +02003183 dev_kfree_skb(rx->skb);
3184 return RX_QUEUED;
Johannes Bergde1ede72008-09-09 14:42:50 +02003185}
3186
3187static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01003188ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02003189{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003190 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg77a121c2010-06-10 10:21:34 +02003191 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3192 __le16 stype;
Johannes Berg571ecf62007-07-27 15:43:22 +02003193
Johannes Berg77a121c2010-06-10 10:21:34 +02003194 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
Johannes Berg472dbc42008-09-11 00:01:49 +02003195
Johannes Berg77a121c2010-06-10 10:21:34 +02003196 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3197 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003198 sdata->vif.type != NL80211_IFTYPE_OCB &&
Johannes Berg77a121c2010-06-10 10:21:34 +02003199 sdata->vif.type != NL80211_IFTYPE_STATION)
3200 return RX_DROP_MONITOR;
Johannes Bergf9d540e2007-09-28 14:02:09 +02003201
Johannes Berg77a121c2010-06-10 10:21:34 +02003202 switch (stype) {
Johannes Berg66e67e42012-01-20 13:55:27 +01003203 case cpu_to_le16(IEEE80211_STYPE_AUTH):
Johannes Berg77a121c2010-06-10 10:21:34 +02003204 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3205 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3206 /* process for all: mesh, mlme, ibss */
3207 break;
Johannes Bergc7a2b5c2019-10-04 15:37:05 +03003208 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3209 if (is_multicast_ether_addr(mgmt->da) &&
3210 !is_broadcast_ether_addr(mgmt->da))
3211 return RX_DROP_MONITOR;
3212
3213 /* process only for station/IBSS */
3214 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3215 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3216 return RX_DROP_MONITOR;
3217 break;
Johannes Berg66e67e42012-01-20 13:55:27 +01003218 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3219 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
Johannes Berg77a121c2010-06-10 10:21:34 +02003220 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
Christian Lamparter2c313332010-11-29 20:53:23 +01003221 if (is_multicast_ether_addr(mgmt->da) &&
3222 !is_broadcast_ether_addr(mgmt->da))
3223 return RX_DROP_MONITOR;
3224
Johannes Berg77a121c2010-06-10 10:21:34 +02003225 /* process only for station */
3226 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3227 return RX_DROP_MONITOR;
3228 break;
3229 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08003230 /* process only for ibss and mesh */
3231 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3232 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
Johannes Berg77a121c2010-06-10 10:21:34 +02003233 return RX_DROP_MONITOR;
3234 break;
3235 default:
3236 return RX_DROP_MONITOR;
3237 }
Johannes Berg46900292009-02-15 12:44:28 +01003238
Johannes Berg77a121c2010-06-10 10:21:34 +02003239 /* queue up frame and kick off work to process it */
Johannes Bergc1475ca2010-06-10 10:21:37 +02003240 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg77a121c2010-06-10 10:21:34 +02003241 skb_queue_tail(&sdata->skb_queue, rx->skb);
3242 ieee80211_queue_work(&rx->local->hw, &sdata->work);
Johannes Berg8b58ff82010-06-10 10:21:51 +02003243 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02003244 rx->sta->rx_stats.packets++;
Johannes Berg77a121c2010-06-10 10:21:34 +02003245
3246 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02003247}
3248
Johannes Berg5f0b7de2009-11-16 13:58:21 +01003249static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3250 struct ieee80211_rate *rate)
Michael Wu3d30d942008-01-31 19:48:27 +01003251{
3252 struct ieee80211_sub_if_data *sdata;
3253 struct ieee80211_local *local = rx->local;
Michael Wu3d30d942008-01-31 19:48:27 +01003254 struct sk_buff *skb = rx->skb, *skb2;
3255 struct net_device *prev_dev = NULL;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003256 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg293702a2012-03-02 13:18:19 +01003257 int needed_headroom;
Michael Wu3d30d942008-01-31 19:48:27 +01003258
Johannes Berg554891e2010-09-24 12:38:25 +02003259 /*
3260 * If cooked monitor has been processed already, then
3261 * don't do it again. If not, set the flag.
3262 */
3263 if (rx->flags & IEEE80211_RX_CMNTR)
John W. Linville7c1e1832010-09-24 15:52:49 -04003264 goto out_free_skb;
Johannes Berg554891e2010-09-24 12:38:25 +02003265 rx->flags |= IEEE80211_RX_CMNTR;
John W. Linville7c1e1832010-09-24 15:52:49 -04003266
Johannes Berg152c4772011-10-21 10:22:22 +02003267 /* If there are no cooked monitor interfaces, just free the SKB */
3268 if (!local->cooked_mntrs)
3269 goto out_free_skb;
3270
Johannes Berg1f7bba72014-11-06 22:56:36 +01003271 /* vendor data is long removed here */
3272 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
Johannes Berg293702a2012-03-02 13:18:19 +01003273 /* room for the radiotap header based on driver features */
Johannes Berg1f7bba72014-11-06 22:56:36 +01003274 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
Johannes Berg293702a2012-03-02 13:18:19 +01003275
3276 if (skb_headroom(skb) < needed_headroom &&
3277 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
Michael Wu3d30d942008-01-31 19:48:27 +01003278 goto out_free_skb;
3279
Johannes Berg293702a2012-03-02 13:18:19 +01003280 /* prepend radiotap information */
Felix Fietkau973ef212012-04-16 14:56:48 +02003281 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3282 false);
Michael Wu3d30d942008-01-31 19:48:27 +01003283
Zhang Shengjud57a5442016-03-03 01:16:56 +00003284 skb_reset_mac_header(skb);
Michael Wu3d30d942008-01-31 19:48:27 +01003285 skb->ip_summed = CHECKSUM_UNNECESSARY;
3286 skb->pkt_type = PACKET_OTHERHOST;
3287 skb->protocol = htons(ETH_P_802_2);
3288
3289 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01003290 if (!ieee80211_sdata_running(sdata))
Michael Wu3d30d942008-01-31 19:48:27 +01003291 continue;
3292
Johannes Berg05c914f2008-09-11 00:01:58 +02003293 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Aviya Erenfeldd8212182016-08-29 23:25:15 +03003294 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
Michael Wu3d30d942008-01-31 19:48:27 +01003295 continue;
3296
3297 if (prev_dev) {
3298 skb2 = skb_clone(skb, GFP_ATOMIC);
3299 if (skb2) {
3300 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04003301 netif_receive_skb(skb2);
Michael Wu3d30d942008-01-31 19:48:27 +01003302 }
3303 }
3304
3305 prev_dev = sdata->dev;
Johannes Berg5a490512015-04-22 17:10:38 +02003306 ieee80211_rx_stats(sdata->dev, skb->len);
Michael Wu3d30d942008-01-31 19:48:27 +01003307 }
3308
3309 if (prev_dev) {
3310 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04003311 netif_receive_skb(skb);
Johannes Berg554891e2010-09-24 12:38:25 +02003312 return;
3313 }
Michael Wu3d30d942008-01-31 19:48:27 +01003314
3315 out_free_skb:
3316 dev_kfree_skb(skb);
3317}
3318
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003319static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3320 ieee80211_rx_result res)
3321{
3322 switch (res) {
3323 case RX_DROP_MONITOR:
3324 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3325 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02003326 rx->sta->rx_stats.dropped++;
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003327 /* fall through */
3328 case RX_CONTINUE: {
3329 struct ieee80211_rate *rate = NULL;
3330 struct ieee80211_supported_band *sband;
3331 struct ieee80211_rx_status *status;
3332
3333 status = IEEE80211_SKB_RXCB((rx->skb));
3334
3335 sband = rx->local->hw.wiphy->bands[status->band];
Johannes Berg56146182012-11-09 15:07:02 +01003336 if (!(status->flag & RX_FLAG_HT) &&
3337 !(status->flag & RX_FLAG_VHT))
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003338 rate = &sband->bitrates[status->rate_idx];
3339
3340 ieee80211_rx_cooked_monitor(rx, rate);
3341 break;
3342 }
3343 case RX_DROP_UNUSABLE:
3344 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3345 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02003346 rx->sta->rx_stats.dropped++;
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003347 dev_kfree_skb(rx->skb);
3348 break;
3349 case RX_QUEUED:
3350 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3351 break;
3352 }
3353}
3354
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003355static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3356 struct sk_buff_head *frames)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003357{
3358 ieee80211_rx_result res = RX_DROP_MONITOR;
3359 struct sk_buff *skb;
3360
3361#define CALL_RXH(rxh) \
3362 do { \
3363 res = rxh(rx); \
3364 if (res != RX_CONTINUE) \
3365 goto rxh_next; \
Johannes Berg8ebaa5b2016-03-31 20:02:04 +03003366 } while (0)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003367
Johannes Berg45ceeee2015-03-16 09:08:20 +01003368 /* Lock here to avoid hitting all of the data used in the RX
3369 * path (e.g. key data, station data, ...) concurrently when
3370 * a frame is released from the reorder buffer due to timeout
3371 * from the timer, potentially concurrently with RX from the
3372 * driver.
3373 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003374 spin_lock_bh(&rx->local->rx_path_lock);
Christian Lamparter24a8fda2010-12-30 17:25:29 +01003375
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003376 while ((skb = __skb_dequeue(frames))) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003377 /*
3378 * all the other fields are valid across frames
3379 * that belong to an aMPDU since they are on the
3380 * same TID from the same station
3381 */
3382 rx->skb = skb;
3383
Johannes Berg8ebaa5b2016-03-31 20:02:04 +03003384 CALL_RXH(ieee80211_rx_h_check_more_data);
3385 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3386 CALL_RXH(ieee80211_rx_h_sta_process);
3387 CALL_RXH(ieee80211_rx_h_decrypt);
3388 CALL_RXH(ieee80211_rx_h_defragment);
3389 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003390 /* must be after MMIC verify so header is counted in MPDU mic */
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003391#ifdef CONFIG_MAC80211_MESH
3392 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3393 CALL_RXH(ieee80211_rx_h_mesh_fwding);
3394#endif
Johannes Berg8ebaa5b2016-03-31 20:02:04 +03003395 CALL_RXH(ieee80211_rx_h_amsdu);
3396 CALL_RXH(ieee80211_rx_h_data);
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003397
3398 /* special treatment -- needs the queue */
3399 res = ieee80211_rx_h_ctrl(rx, frames);
3400 if (res != RX_CONTINUE)
3401 goto rxh_next;
3402
Johannes Berg8ebaa5b2016-03-31 20:02:04 +03003403 CALL_RXH(ieee80211_rx_h_mgmt_check);
3404 CALL_RXH(ieee80211_rx_h_action);
3405 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3406 CALL_RXH(ieee80211_rx_h_action_return);
3407 CALL_RXH(ieee80211_rx_h_mgmt);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003408
3409 rxh_next:
3410 ieee80211_rx_handlers_result(rx, res);
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003411
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003412#undef CALL_RXH
3413 }
Christian Lamparter24a8fda2010-12-30 17:25:29 +01003414
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003415 spin_unlock_bh(&rx->local->rx_path_lock);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003416}
Johannes Berg571ecf62007-07-27 15:43:22 +02003417
Johannes Berg4406c372010-09-24 11:21:06 +02003418static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
Johannes Berg58905292008-01-31 19:48:25 +01003419{
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003420 struct sk_buff_head reorder_release;
Johannes Berg58905292008-01-31 19:48:25 +01003421 ieee80211_rx_result res = RX_DROP_MONITOR;
3422
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003423 __skb_queue_head_init(&reorder_release);
3424
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02003425#define CALL_RXH(rxh) \
3426 do { \
3427 res = rxh(rx); \
3428 if (res != RX_CONTINUE) \
Johannes Berg2569a822009-11-25 17:46:17 +01003429 goto rxh_next; \
Johannes Berg8ebaa5b2016-03-31 20:02:04 +03003430 } while (0)
Johannes Berg58905292008-01-31 19:48:25 +01003431
Johannes Berg8ebaa5b2016-03-31 20:02:04 +03003432 CALL_RXH(ieee80211_rx_h_check_dup);
3433 CALL_RXH(ieee80211_rx_h_check);
Johannes Berg2569a822009-11-25 17:46:17 +01003434
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003435 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
Johannes Berg2569a822009-11-25 17:46:17 +01003436
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003437 ieee80211_rx_handlers(rx, &reorder_release);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003438 return;
Johannes Berg49461622008-06-30 15:10:45 +02003439
Johannes Berg2569a822009-11-25 17:46:17 +01003440 rxh_next:
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003441 ieee80211_rx_handlers_result(rx, res);
3442
3443#undef CALL_RXH
Johannes Berg58905292008-01-31 19:48:25 +01003444}
3445
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003446/*
Johannes Bergdd318572010-11-29 11:09:16 +01003447 * This function makes calls into the RX path, therefore
3448 * it has to be invoked under RCU read lock.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003449 */
3450void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3451{
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003452 struct sk_buff_head frames;
Johannes Berg554891e2010-09-24 12:38:25 +02003453 struct ieee80211_rx_data rx = {
3454 .sta = sta,
3455 .sdata = sta->sdata,
3456 .local = sta->local,
Johannes Berg9e262972011-07-07 18:45:03 +02003457 /* This is OK -- must be QoS data frame */
3458 .security_idx = tid,
3459 .seqno_idx = tid,
Johannes Bergaf9f9b22015-06-11 16:02:32 +02003460 .napi = NULL, /* must be NULL to not have races */
Johannes Berg554891e2010-09-24 12:38:25 +02003461 };
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003462 struct tid_ampdu_rx *tid_agg_rx;
3463
3464 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3465 if (!tid_agg_rx)
3466 return;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003467
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003468 __skb_queue_head_init(&frames);
3469
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003470 spin_lock(&tid_agg_rx->reorder_lock);
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003471 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003472 spin_unlock(&tid_agg_rx->reorder_lock);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003473
Emmanuel Grumbachb497de62015-04-20 22:53:38 +03003474 if (!skb_queue_empty(&frames)) {
3475 struct ieee80211_event event = {
3476 .type = BA_FRAME_TIMEOUT,
3477 .u.ba.tid = tid,
3478 .u.ba.sta = &sta->sta,
3479 };
3480 drv_event_callback(rx.local, rx.sdata, &event);
3481 }
3482
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003483 ieee80211_rx_handlers(&rx, &frames);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003484}
3485
Sara Sharon06470f72016-01-28 16:19:25 +02003486void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3487 u16 ssn, u64 filtered,
3488 u16 received_mpdus)
3489{
3490 struct sta_info *sta;
3491 struct tid_ampdu_rx *tid_agg_rx;
3492 struct sk_buff_head frames;
3493 struct ieee80211_rx_data rx = {
3494 /* This is OK -- must be QoS data frame */
3495 .security_idx = tid,
3496 .seqno_idx = tid,
3497 };
3498 int i, diff;
3499
3500 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3501 return;
3502
3503 __skb_queue_head_init(&frames);
3504
3505 sta = container_of(pubsta, struct sta_info, sta);
3506
3507 rx.sta = sta;
3508 rx.sdata = sta->sdata;
3509 rx.local = sta->local;
3510
3511 rcu_read_lock();
3512 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3513 if (!tid_agg_rx)
3514 goto out;
3515
3516 spin_lock_bh(&tid_agg_rx->reorder_lock);
3517
3518 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3519 int release;
3520
3521 /* release all frames in the reorder buffer */
3522 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3523 IEEE80211_SN_MODULO;
3524 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3525 release, &frames);
3526 /* update ssn to match received ssn */
3527 tid_agg_rx->head_seq_num = ssn;
3528 } else {
3529 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3530 &frames);
3531 }
3532
3533 /* handle the case that received ssn is behind the mac ssn.
3534 * it can be tid_agg_rx->buf_size behind and still be valid */
3535 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3536 if (diff >= tid_agg_rx->buf_size) {
3537 tid_agg_rx->reorder_buf_filtered = 0;
3538 goto release;
3539 }
3540 filtered = filtered >> diff;
3541 ssn += diff;
3542
3543 /* update bitmap */
3544 for (i = 0; i < tid_agg_rx->buf_size; i++) {
3545 int index = (ssn + i) % tid_agg_rx->buf_size;
3546
3547 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3548 if (filtered & BIT_ULL(i))
3549 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3550 }
3551
3552 /* now process also frames that the filter marking released */
3553 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3554
3555release:
3556 spin_unlock_bh(&tid_agg_rx->reorder_lock);
3557
3558 ieee80211_rx_handlers(&rx, &frames);
3559
3560 out:
3561 rcu_read_unlock();
3562}
3563EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3564
Johannes Berg571ecf62007-07-27 15:43:22 +02003565/* main receive path */
3566
Johannes Berga58fbe12015-04-22 15:08:39 +02003567static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
Johannes Berg23a24de2007-07-27 15:43:22 +02003568{
Johannes Berg20b01f82010-09-24 11:21:05 +02003569 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003570 struct sk_buff *skb = rx->skb;
Johannes Berga58fbe12015-04-22 15:08:39 +02003571 struct ieee80211_hdr *hdr = (void *)skb->data;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003572 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3573 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02003574 int multicast = is_multicast_ether_addr(hdr->addr1);
3575
Johannes Berg51fb61e2007-12-19 01:31:27 +01003576 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02003577 case NL80211_IFTYPE_STATION:
Johannes Berg9bc383d2009-11-19 11:55:19 +01003578 if (!bssid && !sdata->u.mgd.use_4addr)
Johannes Berg3c2723f52014-01-07 16:23:24 +01003579 return false;
Johannes Berg9f0f5ff2019-02-13 15:13:30 +01003580 if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
3581 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003582 if (multicast)
3583 return true;
3584 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
Johannes Berg05c914f2008-09-11 00:01:58 +02003585 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02003586 if (!bssid)
Johannes Berg3c2723f52014-01-07 16:23:24 +01003587 return false;
Felix Fietkau6329b8d2013-09-17 11:15:43 +02003588 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3589 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003590 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003591 if (ieee80211_is_beacon(hdr->frame_control))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003592 return true;
Johannes Berga58fbe12015-04-22 15:08:39 +02003593 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003594 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003595 if (!multicast &&
3596 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
Johannes Bergdf140462015-04-22 14:40:58 +02003597 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003598 if (!rx->sta) {
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003599 int rate_idx;
Johannes Berg56146182012-11-09 15:07:02 +01003600 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3601 rate_idx = 0; /* TODO: HT/VHT rates */
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003602 else
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003603 rate_idx = status->rate_idx;
Johannes Berg8bf11d82011-12-15 11:17:37 +01003604 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3605 BIT(rate_idx));
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003606 }
Johannes Berga58fbe12015-04-22 15:08:39 +02003607 return true;
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003608 case NL80211_IFTYPE_OCB:
3609 if (!bssid)
3610 return false;
Bertold Van den Berghcc117292015-08-05 16:02:42 +02003611 if (!ieee80211_is_data_present(hdr->frame_control))
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003612 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003613 if (!is_broadcast_ether_addr(bssid))
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003614 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003615 if (!multicast &&
3616 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
Johannes Bergdf140462015-04-22 14:40:58 +02003617 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003618 if (!rx->sta) {
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003619 int rate_idx;
3620 if (status->flag & RX_FLAG_HT)
3621 rate_idx = 0; /* TODO: HT rates */
3622 else
3623 rate_idx = status->rate_idx;
3624 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3625 BIT(rate_idx));
3626 }
Johannes Berga58fbe12015-04-22 15:08:39 +02003627 return true;
Johannes Berg05c914f2008-09-11 00:01:58 +02003628 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg58c4ee82018-01-04 15:51:53 +01003629 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3630 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003631 if (multicast)
3632 return true;
3633 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
Johannes Berg05c914f2008-09-11 00:01:58 +02003634 case NL80211_IFTYPE_AP_VLAN:
3635 case NL80211_IFTYPE_AP:
Johannes Berga58fbe12015-04-22 15:08:39 +02003636 if (!bssid)
3637 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3638
3639 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
Johannes Berg3df6eae2011-12-06 10:39:40 +01003640 /*
3641 * Accept public action frames even when the
3642 * BSSID doesn't match, this is used for P2P
3643 * and location updates. Note that mac80211
3644 * itself never looks at these frames.
3645 */
Johannes Berg2b9ccd42013-05-13 16:42:40 +02003646 if (!multicast &&
3647 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003648 return false;
Johannes Bergd48b2962012-07-06 22:19:27 +02003649 if (ieee80211_is_public_action(hdr, skb->len))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003650 return true;
Johannes Berg5c900672015-04-22 14:48:34 +02003651 return ieee80211_is_beacon(hdr->frame_control);
Johannes Berga58fbe12015-04-22 15:08:39 +02003652 }
3653
3654 if (!ieee80211_has_tods(hdr->frame_control)) {
Arik Nemtsovdb8e1732014-07-17 17:14:30 +03003655 /* ignore data frames to TDLS-peers */
3656 if (ieee80211_is_data(hdr->frame_control))
3657 return false;
3658 /* ignore action frames to TDLS-peers */
3659 if (ieee80211_is_action(hdr->frame_control) &&
Jouni Malinen1ec7bae2016-03-01 00:29:00 +02003660 !is_broadcast_ether_addr(bssid) &&
Arik Nemtsovdb8e1732014-07-17 17:14:30 +03003661 !ether_addr_equal(bssid, hdr->addr1))
3662 return false;
Johannes Berg23a24de2007-07-27 15:43:22 +02003663 }
Johannes Berge0411f12017-04-20 21:32:16 +02003664
3665 /*
3666 * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3667 * the BSSID - we've checked that already but may have accepted
3668 * the wildcard (ff:ff:ff:ff:ff:ff).
3669 *
3670 * It also says:
3671 * The BSSID of the Data frame is determined as follows:
3672 * a) If the STA is contained within an AP or is associated
3673 * with an AP, the BSSID is the address currently in use
3674 * by the STA contained in the AP.
3675 *
3676 * So we should not accept data frames with an address that's
3677 * multicast.
3678 *
3679 * Accepting it also opens a security problem because stations
3680 * could encrypt it with the GTK and inject traffic that way.
3681 */
3682 if (ieee80211_is_data(hdr->frame_control) && multicast)
3683 return false;
3684
Johannes Berga58fbe12015-04-22 15:08:39 +02003685 return true;
Johannes Berg05c914f2008-09-11 00:01:58 +02003686 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07003687 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003688 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003689 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
Johannes Bergf142c6b2012-06-18 20:07:15 +02003690 case NL80211_IFTYPE_P2P_DEVICE:
Johannes Berga58fbe12015-04-22 15:08:39 +02003691 return ieee80211_is_public_action(hdr, skb->len) ||
3692 ieee80211_is_probe_req(hdr->frame_control) ||
3693 ieee80211_is_probe_resp(hdr->frame_control) ||
3694 ieee80211_is_beacon(hdr->frame_control);
Ayala Bekercb3b7d82016-09-20 17:31:13 +03003695 case NL80211_IFTYPE_NAN:
3696 /* Currently no frames on NAN interface are allowed */
3697 return false;
Johannes Berg2ca27bc2010-09-16 14:58:23 +02003698 default:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02003699 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02003700 }
3701
Johannes Berga58fbe12015-04-22 15:08:39 +02003702 WARN_ON_ONCE(1);
3703 return false;
Johannes Berg23a24de2007-07-27 15:43:22 +02003704}
3705
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003706void ieee80211_check_fast_rx(struct sta_info *sta)
3707{
3708 struct ieee80211_sub_if_data *sdata = sta->sdata;
3709 struct ieee80211_local *local = sdata->local;
3710 struct ieee80211_key *key;
3711 struct ieee80211_fast_rx fastrx = {
3712 .dev = sdata->dev,
3713 .vif_type = sdata->vif.type,
3714 .control_port_protocol = sdata->control_port_protocol,
3715 }, *old, *new = NULL;
3716 bool assign = false;
3717
3718 /* use sparse to check that we don't return without updating */
3719 __acquire(check_fast_rx);
3720
3721 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3722 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3723 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3724 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3725
Johannes Bergc9c59622016-03-31 20:02:11 +03003726 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3727
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003728 /* fast-rx doesn't do reordering */
3729 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3730 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3731 goto clear;
3732
3733 switch (sdata->vif.type) {
3734 case NL80211_IFTYPE_STATION:
3735 /* 4-addr is harder to deal with, later maybe */
3736 if (sdata->u.mgd.use_4addr)
3737 goto clear;
3738 /* software powersave is a huge mess, avoid all of it */
3739 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3740 goto clear;
3741 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3742 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3743 goto clear;
3744 if (sta->sta.tdls) {
3745 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3746 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3747 fastrx.expected_ds_bits = 0;
3748 } else {
3749 fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3750 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3751 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3752 fastrx.expected_ds_bits =
3753 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3754 }
3755 break;
3756 case NL80211_IFTYPE_AP_VLAN:
3757 case NL80211_IFTYPE_AP:
3758 /* parallel-rx requires this, at least with calls to
3759 * ieee80211_sta_ps_transition()
3760 */
3761 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3762 goto clear;
3763 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3764 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3765 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3766
3767 fastrx.internal_forward =
3768 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3769 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3770 !sdata->u.vlan.sta);
3771 break;
3772 default:
3773 goto clear;
3774 }
3775
3776 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3777 goto clear;
3778
3779 rcu_read_lock();
3780 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3781 if (key) {
3782 switch (key->conf.cipher) {
3783 case WLAN_CIPHER_SUITE_TKIP:
3784 /* we don't want to deal with MMIC in fast-rx */
3785 goto clear_rcu;
3786 case WLAN_CIPHER_SUITE_CCMP:
3787 case WLAN_CIPHER_SUITE_CCMP_256:
3788 case WLAN_CIPHER_SUITE_GCMP:
3789 case WLAN_CIPHER_SUITE_GCMP_256:
3790 break;
3791 default:
3792 /* we also don't want to deal with WEP or cipher scheme
3793 * since those require looking up the key idx in the
3794 * frame, rather than assuming the PTK is used
3795 * (we need to revisit this once we implement the real
3796 * PTK index, which is now valid in the spec, but we
3797 * haven't implemented that part yet)
3798 */
3799 goto clear_rcu;
3800 }
3801
3802 fastrx.key = true;
3803 fastrx.icv_len = key->conf.icv_len;
3804 }
3805
3806 assign = true;
3807 clear_rcu:
3808 rcu_read_unlock();
3809 clear:
3810 __release(check_fast_rx);
3811
3812 if (assign)
3813 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3814
3815 spin_lock_bh(&sta->lock);
3816 old = rcu_dereference_protected(sta->fast_rx, true);
3817 rcu_assign_pointer(sta->fast_rx, new);
3818 spin_unlock_bh(&sta->lock);
3819
3820 if (old)
3821 kfree_rcu(old, rcu_head);
3822}
3823
3824void ieee80211_clear_fast_rx(struct sta_info *sta)
3825{
3826 struct ieee80211_fast_rx *old;
3827
3828 spin_lock_bh(&sta->lock);
3829 old = rcu_dereference_protected(sta->fast_rx, true);
3830 RCU_INIT_POINTER(sta->fast_rx, NULL);
3831 spin_unlock_bh(&sta->lock);
3832
3833 if (old)
3834 kfree_rcu(old, rcu_head);
3835}
3836
3837void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3838{
3839 struct ieee80211_local *local = sdata->local;
3840 struct sta_info *sta;
3841
3842 lockdep_assert_held(&local->sta_mtx);
3843
3844 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3845 if (sdata != sta->sdata &&
3846 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3847 continue;
3848 ieee80211_check_fast_rx(sta);
3849 }
3850}
3851
3852void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3853{
3854 struct ieee80211_local *local = sdata->local;
3855
3856 mutex_lock(&local->sta_mtx);
3857 __ieee80211_check_fast_rx_iface(sdata);
3858 mutex_unlock(&local->sta_mtx);
3859}
3860
3861static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3862 struct ieee80211_fast_rx *fast_rx)
3863{
3864 struct sk_buff *skb = rx->skb;
3865 struct ieee80211_hdr *hdr = (void *)skb->data;
3866 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3867 struct sta_info *sta = rx->sta;
3868 int orig_len = skb->len;
3869 int snap_offs = ieee80211_hdrlen(hdr->frame_control);
3870 struct {
3871 u8 snap[sizeof(rfc1042_header)];
3872 __be16 proto;
3873 } *payload __aligned(2);
3874 struct {
3875 u8 da[ETH_ALEN];
3876 u8 sa[ETH_ALEN];
3877 } addrs __aligned(2);
Johannes Bergc9c59622016-03-31 20:02:11 +03003878 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
3879
3880 if (fast_rx->uses_rss)
3881 stats = this_cpu_ptr(sta->pcpu_rx_stats);
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003882
3883 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3884 * to a common data structure; drivers can implement that per queue
3885 * but we don't have that information in mac80211
3886 */
3887 if (!(status->flag & RX_FLAG_DUP_VALIDATED))
3888 return false;
3889
3890#define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3891
3892 /* If using encryption, we also need to have:
3893 * - PN_VALIDATED: similar, but the implementation is tricky
3894 * - DECRYPTED: necessary for PN_VALIDATED
3895 */
3896 if (fast_rx->key &&
3897 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
3898 return false;
3899
3900 /* we don't deal with A-MSDU deaggregation here */
3901 if (status->rx_flags & IEEE80211_RX_AMSDU)
3902 return false;
3903
3904 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3905 return false;
3906
3907 if (unlikely(ieee80211_is_frag(hdr)))
3908 return false;
3909
3910 /* Since our interface address cannot be multicast, this
3911 * implicitly also rejects multicast frames without the
3912 * explicit check.
3913 *
3914 * We shouldn't get any *data* frames not addressed to us
3915 * (AP mode will accept multicast *management* frames), but
3916 * punting here will make it go through the full checks in
3917 * ieee80211_accept_frame().
3918 */
3919 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
3920 return false;
3921
3922 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
3923 IEEE80211_FCTL_TODS)) !=
3924 fast_rx->expected_ds_bits)
Felix Fietkau6588cfd2018-02-23 10:06:03 +01003925 return false;
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003926
3927 /* assign the key to drop unencrypted frames (later)
3928 * and strip the IV/MIC if necessary
3929 */
3930 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
3931 /* GCMP header length is the same */
3932 snap_offs += IEEE80211_CCMP_HDR_LEN;
3933 }
3934
3935 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
3936 goto drop;
3937 payload = (void *)(skb->data + snap_offs);
3938
3939 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
3940 return false;
3941
3942 /* Don't handle these here since they require special code.
3943 * Accept AARP and IPX even though they should come with a
3944 * bridge-tunnel header - but if we get them this way then
3945 * there's little point in discarding them.
3946 */
3947 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
3948 payload->proto == fast_rx->control_port_protocol))
3949 return false;
3950
3951 /* after this point, don't punt to the slowpath! */
3952
3953 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
3954 pskb_trim(skb, skb->len - fast_rx->icv_len))
3955 goto drop;
3956
3957 if (unlikely(fast_rx->sta_notify)) {
3958 ieee80211_sta_rx_notify(rx->sdata, hdr);
3959 fast_rx->sta_notify = false;
3960 }
3961
3962 /* statistics part of ieee80211_rx_h_sta_process() */
Johannes Bergc9c59622016-03-31 20:02:11 +03003963 stats->last_rx = jiffies;
3964 stats->last_rate = sta_stats_encode_rate(status);
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003965
Johannes Bergc9c59622016-03-31 20:02:11 +03003966 stats->fragments++;
Johannes Berg841e4e72017-02-20 08:59:16 +01003967 stats->packets++;
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003968
3969 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
Johannes Bergc9c59622016-03-31 20:02:11 +03003970 stats->last_signal = status->signal;
3971 if (!fast_rx->uses_rss)
3972 ewma_signal_add(&sta->rx_stats_avg.signal,
3973 -status->signal);
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003974 }
3975
3976 if (status->chains) {
3977 int i;
3978
Johannes Bergc9c59622016-03-31 20:02:11 +03003979 stats->chains = status->chains;
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003980 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
3981 int signal = status->chain_signal[i];
3982
3983 if (!(status->chains & BIT(i)))
3984 continue;
3985
Johannes Bergc9c59622016-03-31 20:02:11 +03003986 stats->chain_signal_last[i] = signal;
3987 if (!fast_rx->uses_rss)
3988 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
3989 -signal);
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003990 }
3991 }
3992 /* end of statistics */
3993
3994 if (rx->key && !ieee80211_has_protected(hdr->frame_control))
3995 goto drop;
3996
3997 /* do the header conversion - first grab the addresses */
3998 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
3999 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4000 /* remove the SNAP but leave the ethertype */
4001 skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4002 /* push the addresses in front */
4003 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4004
4005 skb->dev = fast_rx->dev;
4006
4007 ieee80211_rx_stats(fast_rx->dev, skb->len);
4008
4009 /* The seqno index has the same property as needed
4010 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4011 * for non-QoS-data frames. Here we know it's a data
4012 * frame, so count MSDUs.
4013 */
Johannes Bergc9c59622016-03-31 20:02:11 +03004014 u64_stats_update_begin(&stats->syncp);
4015 stats->msdu[rx->seqno_idx]++;
4016 stats->bytes += orig_len;
4017 u64_stats_update_end(&stats->syncp);
Johannes Berg49ddf8e2016-03-31 20:02:10 +03004018
4019 if (fast_rx->internal_forward) {
Johannes Bergbab10a52016-12-14 16:47:43 +01004020 struct sk_buff *xmit_skb = NULL;
4021 bool multicast = is_multicast_ether_addr(skb->data);
Johannes Berg49ddf8e2016-03-31 20:02:10 +03004022
Johannes Bergbab10a52016-12-14 16:47:43 +01004023 if (multicast) {
4024 xmit_skb = skb_copy(skb, GFP_ATOMIC);
4025 } else if (sta_info_get(rx->sdata, skb->data)) {
4026 xmit_skb = skb;
4027 skb = NULL;
4028 }
4029
4030 if (xmit_skb) {
Johannes Berg49ddf8e2016-03-31 20:02:10 +03004031 /*
4032 * Send to wireless media and increase priority by 256
4033 * to keep the received priority instead of
4034 * reclassifying the frame (see cfg80211_classify8021d).
4035 */
Johannes Bergbab10a52016-12-14 16:47:43 +01004036 xmit_skb->priority += 256;
4037 xmit_skb->protocol = htons(ETH_P_802_3);
4038 skb_reset_network_header(xmit_skb);
4039 skb_reset_mac_header(xmit_skb);
4040 dev_queue_xmit(xmit_skb);
Johannes Berg49ddf8e2016-03-31 20:02:10 +03004041 }
Johannes Bergbab10a52016-12-14 16:47:43 +01004042
4043 if (!skb)
4044 return true;
Johannes Berg49ddf8e2016-03-31 20:02:10 +03004045 }
4046
4047 /* deliver to local stack */
4048 skb->protocol = eth_type_trans(skb, fast_rx->dev);
4049 memset(skb->cb, 0, sizeof(skb->cb));
4050 if (rx->napi)
4051 napi_gro_receive(rx->napi, skb);
4052 else
4053 netif_receive_skb(skb);
4054
4055 return true;
4056 drop:
4057 dev_kfree_skb(skb);
Johannes Bergc9c59622016-03-31 20:02:11 +03004058 stats->dropped++;
Johannes Berg49ddf8e2016-03-31 20:02:10 +03004059 return true;
4060}
4061
Johannes Berg571ecf62007-07-27 15:43:22 +02004062/*
Johannes Berg4406c372010-09-24 11:21:06 +02004063 * This function returns whether or not the SKB
4064 * was destined for RX processing or not, which,
4065 * if consume is true, is equivalent to whether
4066 * or not the skb was consumed.
4067 */
4068static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4069 struct sk_buff *skb, bool consume)
4070{
4071 struct ieee80211_local *local = rx->local;
4072 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg4406c372010-09-24 11:21:06 +02004073
4074 rx->skb = skb;
Johannes Berg4406c372010-09-24 11:21:06 +02004075
Johannes Berg49ddf8e2016-03-31 20:02:10 +03004076 /* See if we can do fast-rx; if we have to copy we already lost,
4077 * so punt in that case. We should never have to deliver a data
4078 * frame to multiple interfaces anyway.
4079 *
4080 * We skip the ieee80211_accept_frame() call and do the necessary
4081 * checking inside ieee80211_invoke_fast_rx().
4082 */
4083 if (consume && rx->sta) {
4084 struct ieee80211_fast_rx *fast_rx;
4085
4086 fast_rx = rcu_dereference(rx->sta->fast_rx);
4087 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4088 return true;
4089 }
4090
Johannes Berga58fbe12015-04-22 15:08:39 +02004091 if (!ieee80211_accept_frame(rx))
Johannes Berg4406c372010-09-24 11:21:06 +02004092 return false;
4093
Johannes Berg4406c372010-09-24 11:21:06 +02004094 if (!consume) {
4095 skb = skb_copy(skb, GFP_ATOMIC);
4096 if (!skb) {
4097 if (net_ratelimit())
4098 wiphy_debug(local->hw.wiphy,
Ben Greearb305dae2011-01-08 10:30:54 -08004099 "failed to copy skb for %s\n",
Johannes Berg4406c372010-09-24 11:21:06 +02004100 sdata->name);
4101 return true;
4102 }
4103
4104 rx->skb = skb;
4105 }
4106
4107 ieee80211_invoke_rx_handlers(rx);
4108 return true;
4109}
4110
4111/*
Zhao, Gang6b59db72014-04-21 12:52:59 +08004112 * This is the actual Rx frames handler. as it belongs to Rx path it must
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02004113 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02004114 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02004115static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
Johannes Bergd63b5482016-03-31 20:02:02 +03004116 struct ieee80211_sta *pubsta,
Johannes Bergaf9f9b22015-06-11 16:02:32 +02004117 struct sk_buff *skb,
4118 struct napi_struct *napi)
Johannes Berg571ecf62007-07-27 15:43:22 +02004119{
4120 struct ieee80211_local *local = hw_to_local(hw);
4121 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02004122 struct ieee80211_hdr *hdr;
Zhu Yie3cf8b32010-03-29 17:35:07 +08004123 __le16 fc;
Johannes Berg5cf121c2008-02-25 16:27:43 +01004124 struct ieee80211_rx_data rx;
Johannes Berg4406c372010-09-24 11:21:06 +02004125 struct ieee80211_sub_if_data *prev;
Herbert Xu83e7e4c2016-09-19 19:00:10 +08004126 struct rhlist_head *tmp;
Zhu Yie3cf8b32010-03-29 17:35:07 +08004127 int err = 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02004128
Zhu Yie3cf8b32010-03-29 17:35:07 +08004129 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02004130 memset(&rx, 0, sizeof(rx));
4131 rx.skb = skb;
4132 rx.local = local;
Johannes Bergaf9f9b22015-06-11 16:02:32 +02004133 rx.napi = napi;
Johannes Berg72abd812007-09-17 01:29:22 -04004134
Zhu Yie3cf8b32010-03-29 17:35:07 +08004135 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
Johannes Bergc206ca62015-04-22 20:47:28 +02004136 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
Johannes Berg571ecf62007-07-27 15:43:22 +02004137
Johannes Berg4a4f1a52012-10-26 00:33:36 +02004138 if (ieee80211_is_mgmt(fc)) {
4139 /* drop frame if too short for header */
4140 if (skb->len < ieee80211_hdrlen(fc))
4141 err = -ENOBUFS;
4142 else
4143 err = skb_linearize(skb);
4144 } else {
Zhu Yie3cf8b32010-03-29 17:35:07 +08004145 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
Johannes Berg4a4f1a52012-10-26 00:33:36 +02004146 }
Zhu Yie3cf8b32010-03-29 17:35:07 +08004147
4148 if (err) {
4149 dev_kfree_skb(skb);
4150 return;
4151 }
4152
4153 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg38f37142008-01-29 17:07:43 +01004154 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01004155 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01004156
Johannes Bergd48b2962012-07-06 22:19:27 +02004157 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4158 ieee80211_is_beacon(hdr->frame_control)))
4159 ieee80211_scan_rx(local, skb);
4160
Johannes Bergb507df22017-02-27 09:38:11 +01004161 if (ieee80211_is_data(fc)) {
Johannes Bergd63b5482016-03-31 20:02:02 +03004162 struct sta_info *sta, *prev_sta;
Johannes Berg7bedd0c2015-02-13 21:55:15 +01004163
Johannes Bergb507df22017-02-27 09:38:11 +01004164 if (pubsta) {
4165 rx.sta = container_of(pubsta, struct sta_info, sta);
4166 rx.sdata = rx.sta->sdata;
4167 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4168 return;
4169 goto out;
4170 }
4171
Ben Greear56af3262010-09-23 10:22:24 -07004172 prev_sta = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02004173
Herbert Xu83e7e4c2016-09-19 19:00:10 +08004174 for_each_sta_info(local, hdr->addr2, sta, tmp) {
Ben Greear56af3262010-09-23 10:22:24 -07004175 if (!prev_sta) {
4176 prev_sta = sta;
4177 continue;
4178 }
4179
4180 rx.sta = prev_sta;
4181 rx.sdata = prev_sta->sdata;
Johannes Berg4406c372010-09-24 11:21:06 +02004182 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Johannes Berg571ecf62007-07-27 15:43:22 +02004183
Ben Greear56af3262010-09-23 10:22:24 -07004184 prev_sta = sta;
Johannes Berg4406c372010-09-24 11:21:06 +02004185 }
Ben Greear56af3262010-09-23 10:22:24 -07004186
4187 if (prev_sta) {
4188 rx.sta = prev_sta;
4189 rx.sdata = prev_sta->sdata;
4190
Johannes Berg4406c372010-09-24 11:21:06 +02004191 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
Ben Greear56af3262010-09-23 10:22:24 -07004192 return;
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05304193 goto out;
Ben Greear56af3262010-09-23 10:22:24 -07004194 }
Johannes Berg4406c372010-09-24 11:21:06 +02004195 }
4196
Johannes Berg4b0dd982010-09-24 11:21:07 +02004197 prev = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02004198
Johannes Berg4b0dd982010-09-24 11:21:07 +02004199 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4200 if (!ieee80211_sdata_running(sdata))
4201 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01004202
Johannes Berg4b0dd982010-09-24 11:21:07 +02004203 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4204 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4205 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01004206
Johannes Berg4b0dd982010-09-24 11:21:07 +02004207 /*
4208 * frame is destined for this interface, but if it's
4209 * not also for the previous one we handle that after
4210 * the loop to avoid copying the SKB once too much
4211 */
Johannes Bergb2e77712007-09-26 15:19:39 +02004212
Johannes Berg4b0dd982010-09-24 11:21:07 +02004213 if (!prev) {
Johannes Berg340e11f2007-07-27 15:43:22 +02004214 prev = sdata;
Johannes Berg4b0dd982010-09-24 11:21:07 +02004215 continue;
Johannes Berg8e6f00322007-07-27 15:43:22 +02004216 }
Felix Fietkau4bb29f82010-01-22 00:36:39 +01004217
Johannes Berg7852e362012-01-20 13:55:24 +01004218 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Johannes Berg4b0dd982010-09-24 11:21:07 +02004219 rx.sdata = prev;
4220 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01004221
Johannes Berg4b0dd982010-09-24 11:21:07 +02004222 prev = sdata;
4223 }
Johannes Berg4406c372010-09-24 11:21:06 +02004224
Johannes Berg4b0dd982010-09-24 11:21:07 +02004225 if (prev) {
Johannes Berg7852e362012-01-20 13:55:24 +01004226 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Johannes Berg4b0dd982010-09-24 11:21:07 +02004227 rx.sdata = prev;
4228
4229 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4230 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02004231 }
Johannes Berg4406c372010-09-24 11:21:06 +02004232
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05304233 out:
Johannes Berg4406c372010-09-24 11:21:06 +02004234 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02004235}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02004236
4237/*
4238 * This is the receive path handler. It is called by a low level driver when an
4239 * 802.11 MPDU is received from the hardware.
4240 */
Johannes Bergd63b5482016-03-31 20:02:02 +03004241void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4242 struct sk_buff *skb, struct napi_struct *napi)
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02004243{
4244 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01004245 struct ieee80211_rate *rate = NULL;
4246 struct ieee80211_supported_band *sband;
Johannes Bergf1d58c22009-06-17 13:13:00 +02004247 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg8318d782008-01-24 19:38:38 +01004248
Johannes Bergd20ef632009-10-11 15:10:40 +02004249 WARN_ON_ONCE(softirq_count() == 0);
4250
Johannes Berg57fbcce2016-04-12 15:56:15 +02004251 if (WARN_ON(status->band >= NUM_NL80211_BANDS))
Johannes Berg77a980d2009-08-24 11:46:30 +02004252 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01004253
4254 sband = local->hw.wiphy->bands[status->band];
Johannes Berg77a980d2009-08-24 11:46:30 +02004255 if (WARN_ON(!sband))
4256 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01004257
Johannes Berg89c3a8a2009-07-28 18:10:17 +02004258 /*
4259 * If we're suspending, it is possible although not too likely
4260 * that we'd be receiving frames after having already partially
4261 * quiesced the stack. We can't process such frames then since
4262 * that might, for example, cause stations to be added or other
4263 * driver callbacks be invoked.
4264 */
Johannes Berg77a980d2009-08-24 11:46:30 +02004265 if (unlikely(local->quiescing || local->suspended))
4266 goto drop;
Johannes Berg89c3a8a2009-07-28 18:10:17 +02004267
Arik Nemtsov04800ad2012-06-06 11:25:02 +03004268 /* We might be during a HW reconfig, prevent Rx for the same reason */
4269 if (unlikely(local->in_reconfig))
4270 goto drop;
4271
Johannes Bergea77f122009-08-21 14:44:45 +02004272 /*
4273 * The same happens when we're not even started,
4274 * but that's worth a warning.
4275 */
Johannes Berg77a980d2009-08-24 11:46:30 +02004276 if (WARN_ON(!local->started))
4277 goto drop;
Johannes Bergea77f122009-08-21 14:44:45 +02004278
Johannes Bergfc885182010-07-30 13:23:12 +02004279 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05004280 /*
Johannes Bergfc885182010-07-30 13:23:12 +02004281 * Validate the rate, unless a PLCP error means that
4282 * we probably can't have a valid rate here anyway.
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05004283 */
Johannes Bergfc885182010-07-30 13:23:12 +02004284
4285 if (status->flag & RX_FLAG_HT) {
4286 /*
4287 * rate_idx is MCS index, which can be [0-76]
4288 * as documented on:
4289 *
4290 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4291 *
4292 * Anything else would be some sort of driver or
4293 * hardware error. The driver should catch hardware
4294 * errors.
4295 */
Johannes Berg444e38032012-09-30 17:08:35 +02004296 if (WARN(status->rate_idx > 76,
Johannes Bergfc885182010-07-30 13:23:12 +02004297 "Rate marked as an HT rate but passed "
4298 "status->rate_idx is not "
4299 "an MCS index [0-76]: %d (0x%02x)\n",
4300 status->rate_idx,
4301 status->rate_idx))
4302 goto drop;
Johannes Berg56146182012-11-09 15:07:02 +01004303 } else if (status->flag & RX_FLAG_VHT) {
4304 if (WARN_ONCE(status->rate_idx > 9 ||
4305 !status->vht_nss ||
4306 status->vht_nss > 8,
4307 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4308 status->rate_idx, status->vht_nss))
4309 goto drop;
Johannes Bergfc885182010-07-30 13:23:12 +02004310 } else {
Johannes Berg444e38032012-09-30 17:08:35 +02004311 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
Johannes Bergfc885182010-07-30 13:23:12 +02004312 goto drop;
4313 rate = &sband->bitrates[status->rate_idx];
4314 }
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02004315 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02004316
Johannes Berg554891e2010-09-24 12:38:25 +02004317 status->rx_flags = 0;
4318
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02004319 /*
4320 * key references and virtual interfaces are protected using RCU
4321 * and this requires that we are in a read-side RCU section during
4322 * receive processing
4323 */
4324 rcu_read_lock();
4325
4326 /*
4327 * Frames with failed FCS/PLCP checksum are not returned,
4328 * all other frames are returned without radiotap header
4329 * if it was previously present.
4330 * Also, frames with less than 16 bytes are dropped.
4331 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02004332 skb = ieee80211_rx_monitor(local, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02004333 if (!skb) {
4334 rcu_read_unlock();
4335 return;
4336 }
4337
Johannes Berge1e54062010-11-30 08:58:45 +01004338 ieee80211_tpt_led_trig_rx(local,
4339 ((struct ieee80211_hdr *)skb->data)->frame_control,
4340 skb->len);
Johannes Bergd63b5482016-03-31 20:02:02 +03004341
4342 __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02004343
4344 rcu_read_unlock();
Johannes Berg77a980d2009-08-24 11:46:30 +02004345
4346 return;
4347 drop:
4348 kfree_skb(skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02004349}
Johannes Bergaf9f9b22015-06-11 16:02:32 +02004350EXPORT_SYMBOL(ieee80211_rx_napi);
Johannes Berg571ecf62007-07-27 15:43:22 +02004351
4352/* This is a version of the rx handler that can be called from hard irq
4353 * context. Post the skb on the queue and schedule the tasklet */
Johannes Bergf1d58c22009-06-17 13:13:00 +02004354void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02004355{
4356 struct ieee80211_local *local = hw_to_local(hw);
4357
4358 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4359
Johannes Berg571ecf62007-07-27 15:43:22 +02004360 skb->pkt_type = IEEE80211_RX_MSG;
4361 skb_queue_tail(&local->skb_queue, skb);
4362 tasklet_schedule(&local->tasklet);
4363}
4364EXPORT_SYMBOL(ieee80211_rx_irqsafe);