blob: a47bbc973f2dbc629aa8ab6ed91c928784cd26c6 [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
Johannes Bergfb4ea052016-01-28 16:19:24 +02007 * Copyright(c) 2015 - 2016 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 Berg90b9e4462012-11-16 10:09:08 +0100155
156 if (ieee80211_have_rx_timestamp(status)) {
157 len = ALIGN(len, 8);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200158 len += 8;
Johannes Berg90b9e4462012-11-16 10:09:08 +0100159 }
Johannes Berg30686bf2015-06-02 21:39:54 +0200160 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200161 len += 1;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200162
Johannes Berga144f372013-07-03 13:34:02 +0200163 /* antenna field, if we don't have per-chain info */
164 if (!status->chains)
165 len += 1;
166
Johannes Berg90b9e4462012-11-16 10:09:08 +0100167 /* padding for RX_FLAGS if necessary */
168 len = ALIGN(len, 2);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200169
Johannes Berg6d744ba2011-01-27 14:13:17 +0100170 if (status->flag & RX_FLAG_HT) /* HT info */
171 len += 3;
172
Johannes Berg4c298672012-07-05 11:34:31 +0200173 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
Johannes Berg90b9e4462012-11-16 10:09:08 +0100174 len = ALIGN(len, 4);
Johannes Berg4c298672012-07-05 11:34:31 +0200175 len += 8;
176 }
177
Johannes Berg51648922012-11-22 23:00:18 +0100178 if (status->flag & RX_FLAG_VHT) {
179 len = ALIGN(len, 2);
180 len += 12;
181 }
182
Johannes Berg99ee7ca2016-08-29 23:25:17 +0300183 if (local->hw.radiotap_timestamp.units_pos >= 0) {
184 len = ALIGN(len, 8);
185 len += 12;
186 }
187
Johannes Berga144f372013-07-03 13:34:02 +0200188 if (status->chains) {
189 /* antenna and antenna signal fields */
190 len += 2 * hweight8(status->chains);
191 }
192
Johannes Berg1f7bba72014-11-06 22:56:36 +0100193 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
194 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
195
196 /* vendor presence bitmap */
197 len += 4;
198 /* alignment for fixed 6-byte vendor data header */
199 len = ALIGN(len, 2);
200 /* vendor data header */
201 len += 6;
202 if (WARN_ON(rtap->align == 0))
203 rtap->align = 1;
204 len = ALIGN(len, rtap->align);
205 len += rtap->len + rtap->pad;
206 }
207
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200208 return len;
209}
210
Johannes Berg00ea6de2012-09-05 15:54:51 +0200211/*
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200212 * ieee80211_add_rx_radiotap_header - add radiotap header
213 *
214 * add a radiotap header containing all the fields which the hardware provided.
215 */
216static void
217ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
218 struct sk_buff *skb,
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200219 struct ieee80211_rate *rate,
Felix Fietkau973ef212012-04-16 14:56:48 +0200220 int rtap_len, bool has_fcs)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200221{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200222 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200223 struct ieee80211_radiotap_header *rthdr;
224 unsigned char *pos;
Johannes Berga144f372013-07-03 13:34:02 +0200225 __le32 *it_present;
226 u32 it_present_val;
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100227 u16 rx_flags = 0;
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200228 u16 channel_flags = 0;
Johannes Berga144f372013-07-03 13:34:02 +0200229 int mpdulen, chain;
230 unsigned long chains = status->chains;
Johannes Berg1f7bba72014-11-06 22:56:36 +0100231 struct ieee80211_vendor_radiotap rtap = {};
232
233 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
234 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
235 /* rtap.len and rtap.pad are undone immediately */
236 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
237 }
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800238
239 mpdulen = skb->len;
Johannes Berg30686bf2015-06-02 21:39:54 +0200240 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800241 mpdulen += FCS_LEN;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200242
243 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
Johannes Berg1f7bba72014-11-06 22:56:36 +0100244 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
Johannes Berga144f372013-07-03 13:34:02 +0200245 it_present = &rthdr->it_present;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200246
247 /* radiotap header, set always present flags */
Emmanuel Grumbach0059b2b2014-02-05 16:36:01 +0200248 rthdr->it_len = cpu_to_le16(rtap_len);
Johannes Berga144f372013-07-03 13:34:02 +0200249 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
250 BIT(IEEE80211_RADIOTAP_CHANNEL) |
251 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200252
Johannes Berga144f372013-07-03 13:34:02 +0200253 if (!status->chains)
254 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
255
256 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
257 it_present_val |=
258 BIT(IEEE80211_RADIOTAP_EXT) |
259 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
260 put_unaligned_le32(it_present_val, it_present);
261 it_present++;
262 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
263 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
264 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200265
Johannes Berg1f7bba72014-11-06 22:56:36 +0100266 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
267 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
268 BIT(IEEE80211_RADIOTAP_EXT);
269 put_unaligned_le32(it_present_val, it_present);
270 it_present++;
271 it_present_val = rtap.present;
272 }
273
Johannes Berga144f372013-07-03 13:34:02 +0200274 put_unaligned_le32(it_present_val, it_present);
275
276 pos = (void *)(it_present + 1);
277
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200278 /* the order of the following fields is important */
279
280 /* IEEE80211_RADIOTAP_TSFT */
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800281 if (ieee80211_have_rx_timestamp(status)) {
Johannes Berg90b9e4462012-11-16 10:09:08 +0100282 /* padding */
283 while ((pos - (u8 *)rthdr) & 7)
284 *pos++ = 0;
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800285 put_unaligned_le64(
286 ieee80211_calculate_rx_timestamp(local, status,
287 mpdulen, 0),
288 pos);
Johannes Berg1df332e2012-10-26 00:09:11 +0200289 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200290 pos += 8;
291 }
292
293 /* IEEE80211_RADIOTAP_FLAGS */
Johannes Berg30686bf2015-06-02 21:39:54 +0200294 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200295 *pos |= IEEE80211_RADIOTAP_F_FCS;
Johannes Bergaae89832009-03-13 12:52:10 +0100296 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
297 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
Bruno Randolfb4f28bb2008-07-30 17:19:55 +0200298 if (status->flag & RX_FLAG_SHORTPRE)
299 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200300 pos++;
301
302 /* IEEE80211_RADIOTAP_RATE */
Johannes Berg56146182012-11-09 15:07:02 +0100303 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200304 /*
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100305 * Without rate information don't add it. If we have,
Mohammed Shafi Shajakhan38f37be2011-02-07 10:10:04 +0530306 * MCS information is a separate field in radiotap,
Johannes Berg73b48092011-04-18 17:05:21 +0200307 * added below. The byte here is needed as padding
308 * for the channel though, so initialise it to 0.
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200309 */
310 *pos = 0;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200311 } else {
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200312 int shift = 0;
Jouni Malinenebe6c7b2009-01-10 11:47:33 +0200313 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200314 if (status->flag & RX_FLAG_10MHZ)
315 shift = 1;
316 else if (status->flag & RX_FLAG_5MHZ)
317 shift = 2;
318 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200319 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200320 pos++;
321
322 /* IEEE80211_RADIOTAP_CHANNEL */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100323 put_unaligned_le16(status->freq, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200324 pos += 2;
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200325 if (status->flag & RX_FLAG_10MHZ)
326 channel_flags |= IEEE80211_CHAN_HALF;
327 else if (status->flag & RX_FLAG_5MHZ)
328 channel_flags |= IEEE80211_CHAN_QUARTER;
329
Johannes Berg57fbcce2016-04-12 15:56:15 +0200330 if (status->band == NL80211_BAND_5GHZ)
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200331 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
Johannes Berg56146182012-11-09 15:07:02 +0100332 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200333 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100334 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200335 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100336 else if (rate)
Mathy Vanhoef3a5c5e82015-01-20 15:05:08 +0100337 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100338 else
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200339 channel_flags |= IEEE80211_CHAN_2GHZ;
340 put_unaligned_le16(channel_flags, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200341 pos += 2;
342
343 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
Johannes Berg30686bf2015-06-02 21:39:54 +0200344 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
Felix Fietkaufe8431f2012-03-01 18:00:07 +0100345 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200346 *pos = status->signal;
347 rthdr->it_present |=
348 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
349 pos++;
350 }
351
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200352 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
353
Johannes Berga144f372013-07-03 13:34:02 +0200354 if (!status->chains) {
355 /* IEEE80211_RADIOTAP_ANTENNA */
356 *pos = status->antenna;
357 pos++;
358 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200359
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200360 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
361
362 /* IEEE80211_RADIOTAP_RX_FLAGS */
363 /* ensure 2 byte alignment for the 2 byte field as required */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100364 if ((pos - (u8 *)rthdr) & 1)
Johannes Berg90b9e4462012-11-16 10:09:08 +0100365 *pos++ = 0;
Johannes Bergaae89832009-03-13 12:52:10 +0100366 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100367 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
368 put_unaligned_le16(rx_flags, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200369 pos += 2;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100370
371 if (status->flag & RX_FLAG_HT) {
Oleksij Rempel786677d2013-05-24 12:05:45 +0200372 unsigned int stbc;
373
Johannes Berg6d744ba2011-01-27 14:13:17 +0100374 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
Johannes Bergac55d2f2012-05-10 09:09:10 +0200375 *pos++ = local->hw.radiotap_mcs_details;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100376 *pos = 0;
377 if (status->flag & RX_FLAG_SHORT_GI)
378 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
379 if (status->flag & RX_FLAG_40MHZ)
380 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
Johannes Bergac55d2f2012-05-10 09:09:10 +0200381 if (status->flag & RX_FLAG_HT_GF)
382 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
Emmanuel Grumbach63c361f2014-02-05 12:48:53 +0200383 if (status->flag & RX_FLAG_LDPC)
384 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
Oleksij Rempel786677d2013-05-24 12:05:45 +0200385 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
386 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100387 pos++;
388 *pos++ = status->rate_idx;
389 }
Johannes Berg4c298672012-07-05 11:34:31 +0200390
391 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
392 u16 flags = 0;
393
394 /* ensure 4 byte alignment */
395 while ((pos - (u8 *)rthdr) & 3)
396 pos++;
397 rthdr->it_present |=
398 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
399 put_unaligned_le32(status->ampdu_reference, pos);
400 pos += 4;
Johannes Berg4c298672012-07-05 11:34:31 +0200401 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
402 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
403 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
404 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
405 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
406 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
407 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
408 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
409 put_unaligned_le16(flags, pos);
410 pos += 2;
411 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
412 *pos++ = status->ampdu_delimiter_crc;
413 else
414 *pos++ = 0;
415 *pos++ = 0;
416 }
Johannes Berg90b9e4462012-11-16 10:09:08 +0100417
Johannes Berg51648922012-11-22 23:00:18 +0100418 if (status->flag & RX_FLAG_VHT) {
419 u16 known = local->hw.radiotap_vht_details;
420
421 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
Johannes Berg51648922012-11-22 23:00:18 +0100422 put_unaligned_le16(known, pos);
423 pos += 2;
424 /* flags */
425 if (status->flag & RX_FLAG_SHORT_GI)
426 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
Emmanuel Grumbach63c361f2014-02-05 12:48:53 +0200427 /* in VHT, STBC is binary */
428 if (status->flag & RX_FLAG_STBC_MASK)
429 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
Emmanuel Grumbachfb378c22014-03-04 10:35:25 +0200430 if (status->vht_flag & RX_VHT_FLAG_BF)
431 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
Johannes Berg51648922012-11-22 23:00:18 +0100432 pos++;
433 /* bandwidth */
Emmanuel Grumbach1b8d2422014-02-05 16:37:11 +0200434 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
Johannes Berg51648922012-11-22 23:00:18 +0100435 *pos++ = 4;
Emmanuel Grumbach1b8d2422014-02-05 16:37:11 +0200436 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
Johannes Berg51648922012-11-22 23:00:18 +0100437 *pos++ = 11;
438 else if (status->flag & RX_FLAG_40MHZ)
439 *pos++ = 1;
440 else /* 20 MHz */
441 *pos++ = 0;
442 /* MCS/NSS */
443 *pos = (status->rate_idx << 4) | status->vht_nss;
444 pos += 4;
445 /* coding field */
Emmanuel Grumbach63c361f2014-02-05 12:48:53 +0200446 if (status->flag & RX_FLAG_LDPC)
447 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
Johannes Berg51648922012-11-22 23:00:18 +0100448 pos++;
449 /* group ID */
450 pos++;
451 /* partial_aid */
452 pos += 2;
453 }
454
Johannes Berg99ee7ca2016-08-29 23:25:17 +0300455 if (local->hw.radiotap_timestamp.units_pos >= 0) {
456 u16 accuracy = 0;
457 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
458
459 rthdr->it_present |=
460 cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
461
462 /* ensure 8 byte alignment */
463 while ((pos - (u8 *)rthdr) & 7)
464 pos++;
465
466 put_unaligned_le64(status->device_timestamp, pos);
467 pos += sizeof(u64);
468
469 if (local->hw.radiotap_timestamp.accuracy >= 0) {
470 accuracy = local->hw.radiotap_timestamp.accuracy;
471 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
472 }
473 put_unaligned_le16(accuracy, pos);
474 pos += sizeof(u16);
475
476 *pos++ = local->hw.radiotap_timestamp.units_pos;
477 *pos++ = flags;
478 }
479
Johannes Berga144f372013-07-03 13:34:02 +0200480 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
481 *pos++ = status->chain_signal[chain];
482 *pos++ = chain;
483 }
Johannes Berg1f7bba72014-11-06 22:56:36 +0100484
485 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
486 /* ensure 2 byte alignment for the vendor field as required */
487 if ((pos - (u8 *)rthdr) & 1)
488 *pos++ = 0;
489 *pos++ = rtap.oui[0];
490 *pos++ = rtap.oui[1];
491 *pos++ = rtap.oui[2];
492 *pos++ = rtap.subns;
493 put_unaligned_le16(rtap.len, pos);
494 pos += 2;
495 /* align the actual payload as requested */
496 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
497 *pos++ = 0;
498 /* data (and possible padding) already follows */
499 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200500}
501
Johannes Bergb2e77712007-09-26 15:19:39 +0200502/*
503 * This function copies a received frame to all monitor interfaces and
504 * returns a cleaned-up SKB that no longer includes the FCS nor the
505 * radiotap header the driver might have added.
506 */
507static struct sk_buff *
508ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
Johannes Berg8318d782008-01-24 19:38:38 +0100509 struct ieee80211_rate *rate)
Johannes Bergb2e77712007-09-26 15:19:39 +0200510{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200511 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200512 struct ieee80211_sub_if_data *sdata;
Johannes Berg1f7bba72014-11-06 22:56:36 +0100513 int rt_hdrlen, needed_headroom;
Johannes Bergb2e77712007-09-26 15:19:39 +0200514 struct sk_buff *skb, *skb2;
515 struct net_device *prev_dev = NULL;
516 int present_fcs_len = 0;
Johannes Berg1f7bba72014-11-06 22:56:36 +0100517 unsigned int rtap_vendor_space = 0;
Aviya Erenfeld42bd20d2016-08-29 23:25:16 +0300518 struct ieee80211_mgmt *mgmt;
519 struct ieee80211_sub_if_data *monitor_sdata =
520 rcu_dereference(local->monitor_sdata);
Johannes Berg1f7bba72014-11-06 22:56:36 +0100521
522 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
523 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
524
525 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
526 }
Johannes Bergb2e77712007-09-26 15:19:39 +0200527
528 /*
529 * First, we may need to make a copy of the skb because
530 * (1) we need to modify it for radiotap (if not present), and
531 * (2) the other RX handlers will modify the skb we got.
532 *
533 * We don't need to, of course, if we aren't going to return
534 * the SKB because it has a bad FCS/PLCP checksum.
535 */
Johannes Berg0869aea2009-10-28 10:03:35 +0100536
Johannes Berg30686bf2015-06-02 21:39:54 +0200537 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
Johannes Bergb2e77712007-09-26 15:19:39 +0200538 present_fcs_len = FCS_LEN;
539
Johannes Berg1f7bba72014-11-06 22:56:36 +0100540 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
541 if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
Zhu Yie3cf8b32010-03-29 17:35:07 +0800542 dev_kfree_skb(origskb);
543 return NULL;
544 }
545
Grzegorz Bajorski17883042015-12-11 14:39:46 +0100546 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
Johannes Berg1f7bba72014-11-06 22:56:36 +0100547 if (should_drop_frame(origskb, present_fcs_len,
548 rtap_vendor_space)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200549 dev_kfree_skb(origskb);
550 return NULL;
551 }
552
Johannes Berg1f7bba72014-11-06 22:56:36 +0100553 return remove_monitor_info(local, origskb, rtap_vendor_space);
Johannes Bergb2e77712007-09-26 15:19:39 +0200554 }
555
Helmut Schaa751413e2012-12-05 14:36:12 +0100556 /* room for the radiotap header based on driver features */
Johannes Berg1f7bba72014-11-06 22:56:36 +0100557 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
558 needed_headroom = rt_hdrlen - rtap_vendor_space;
Helmut Schaa751413e2012-12-05 14:36:12 +0100559
Johannes Berg1f7bba72014-11-06 22:56:36 +0100560 if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200561 /* only need to expand headroom if necessary */
562 skb = origskb;
563 origskb = NULL;
564
565 /*
566 * This shouldn't trigger often because most devices have an
567 * RX header they pull before we get here, and that should
568 * be big enough for our radiotap information. We should
569 * probably export the length to drivers so that we can have
570 * them allocate enough headroom to start with.
571 */
572 if (skb_headroom(skb) < needed_headroom &&
Johannes Bergc49e5ea2007-12-11 21:33:42 +0100573 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200574 dev_kfree_skb(skb);
575 return NULL;
576 }
577 } else {
578 /*
579 * Need to make a copy and possibly remove radiotap header
580 * and FCS from the original.
581 */
582 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
583
Johannes Berg1f7bba72014-11-06 22:56:36 +0100584 origskb = remove_monitor_info(local, origskb,
585 rtap_vendor_space);
Johannes Bergb2e77712007-09-26 15:19:39 +0200586
587 if (!skb)
588 return origskb;
589 }
590
Johannes Berg0869aea2009-10-28 10:03:35 +0100591 /* prepend radiotap information */
Johannes Berg1f7bba72014-11-06 22:56:36 +0100592 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
Johannes Bergb2e77712007-09-26 15:19:39 +0200593
Johannes Bergce3edf6d02007-12-19 01:31:22 +0100594 skb_reset_mac_header(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200595 skb->ip_summed = CHECKSUM_UNNECESSARY;
596 skb->pkt_type = PACKET_OTHERHOST;
597 skb->protocol = htons(ETH_P_802_2);
598
599 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200600 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +0200601 continue;
602
Aviya Erenfeldd8212182016-08-29 23:25:15 +0300603 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
Michael Wu3d30d942008-01-31 19:48:27 +0100604 continue;
605
Johannes Berg9607e6b2009-12-23 13:15:31 +0100606 if (!ieee80211_sdata_running(sdata))
Johannes Berg47846c92009-11-25 17:46:19 +0100607 continue;
608
Johannes Bergb2e77712007-09-26 15:19:39 +0200609 if (prev_dev) {
610 skb2 = skb_clone(skb, GFP_ATOMIC);
611 if (skb2) {
612 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400613 netif_receive_skb(skb2);
Johannes Bergb2e77712007-09-26 15:19:39 +0200614 }
615 }
616
617 prev_dev = sdata->dev;
Johannes Berg5a490512015-04-22 17:10:38 +0200618 ieee80211_rx_stats(sdata->dev, skb->len);
Johannes Bergb2e77712007-09-26 15:19:39 +0200619 }
620
Aviya Erenfeld42bd20d2016-08-29 23:25:16 +0300621 mgmt = (void *)skb->data;
622 if (monitor_sdata &&
623 skb->len >= IEEE80211_MIN_ACTION_SIZE + 1 + VHT_MUMIMO_GROUPS_DATA_LEN &&
624 ieee80211_is_action(mgmt->frame_control) &&
625 mgmt->u.action.category == WLAN_CATEGORY_VHT &&
626 mgmt->u.action.u.vht_group_notif.action_code == WLAN_VHT_ACTION_GROUPID_MGMT &&
627 is_valid_ether_addr(monitor_sdata->u.mntr.mu_follow_addr) &&
628 ether_addr_equal(mgmt->da, monitor_sdata->u.mntr.mu_follow_addr)) {
629 struct sk_buff *mu_skb = skb_copy(skb, GFP_ATOMIC);
630
631 if (mu_skb) {
632 mu_skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
633 skb_queue_tail(&monitor_sdata->skb_queue, mu_skb);
634 ieee80211_queue_work(&local->hw, &monitor_sdata->work);
635 }
636 }
637
Johannes Bergb2e77712007-09-26 15:19:39 +0200638 if (prev_dev) {
639 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400640 netif_receive_skb(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200641 } else
642 dev_kfree_skb(skb);
643
644 return origskb;
645}
646
Johannes Berg5cf121c2008-02-25 16:27:43 +0100647static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200648{
Harvey Harrison238f74a2008-07-02 11:05:34 -0700649 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +0200650 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg9e262972011-07-07 18:45:03 +0200651 int tid, seqno_idx, security_idx;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200652
653 /* does the frame have a qos control field? */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700654 if (ieee80211_is_data_qos(hdr->frame_control)) {
655 u8 *qc = ieee80211_get_qos_ctl(hdr);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200656 /* frame has qos control */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700657 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
Johannes Berg04b7dcf2011-06-22 10:06:59 +0200658 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
Johannes Berg554891e2010-09-24 12:38:25 +0200659 status->rx_flags |= IEEE80211_RX_AMSDU;
Johannes Berg9e262972011-07-07 18:45:03 +0200660
661 seqno_idx = tid;
662 security_idx = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200663 } else {
Johannes Berg1411f9b2008-07-10 10:11:02 +0200664 /*
665 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
666 *
667 * Sequence numbers for management frames, QoS data
668 * frames with a broadcast/multicast address in the
669 * Address 1 field, and all non-QoS data frames sent
670 * by QoS STAs are assigned using an additional single
671 * modulo-4096 counter, [...]
672 *
673 * We also use that counter for non-QoS STAs.
674 */
Johannes Berg5a306f52012-11-14 23:22:21 +0100675 seqno_idx = IEEE80211_NUM_TIDS;
Johannes Berg9e262972011-07-07 18:45:03 +0200676 security_idx = 0;
677 if (ieee80211_is_mgmt(hdr->frame_control))
Johannes Berg5a306f52012-11-14 23:22:21 +0100678 security_idx = IEEE80211_NUM_TIDS;
Johannes Berg9e262972011-07-07 18:45:03 +0200679 tid = 0;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200680 }
Johannes Berg52865dfd2007-07-27 15:43:22 +0200681
Johannes Berg9e262972011-07-07 18:45:03 +0200682 rx->seqno_idx = seqno_idx;
683 rx->security_idx = security_idx;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200684 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
685 * For now, set skb->priority to 0 for other cases. */
686 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100687}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200688
Johannes Bergd1c3a372009-01-07 00:26:10 +0100689/**
690 * DOC: Packet alignment
691 *
692 * Drivers always need to pass packets that are aligned to two-byte boundaries
693 * to the stack.
694 *
695 * Additionally, should, if possible, align the payload data in a way that
696 * guarantees that the contained IP header is aligned to a four-byte
697 * boundary. In the case of regular frames, this simply means aligning the
698 * payload to a four-byte boundary (because either the IP header is directly
699 * contained, or IV/RFC1042 headers that have a length divisible by four are
Kalle Valo59d9cb02009-12-17 13:54:57 +0100700 * in front of it). If the payload data is not properly aligned and the
701 * architecture doesn't support efficient unaligned operations, mac80211
702 * will align the data.
Johannes Bergd1c3a372009-01-07 00:26:10 +0100703 *
704 * With A-MSDU frames, however, the payload data address must yield two modulo
705 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
706 * push the IP header further back to a multiple of four again. Thankfully, the
707 * specs were sane enough this time around to require padding each A-MSDU
708 * subframe to a length that is a multiple of four.
709 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300710 * Padding like Atheros hardware adds which is between the 802.11 header and
Johannes Bergd1c3a372009-01-07 00:26:10 +0100711 * the payload is not supported, the driver is required to move the 802.11
712 * header to be directly in front of the payload in that case.
713 */
714static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
Johannes Berg38f37142008-01-29 17:07:43 +0100715{
Kalle Valo59d9cb02009-12-17 13:54:57 +0100716#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg441275e2015-11-06 12:34:24 +0100717 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
Johannes Bergd1c3a372009-01-07 00:26:10 +0100718#endif
Johannes Berg6e0d1142007-07-27 15:43:22 +0200719}
720
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +0200721
Johannes Berg571ecf62007-07-27 15:43:22 +0200722/* rx handlers */
723
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200724static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
725{
726 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
727
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100728 if (is_multicast_ether_addr(hdr->addr1))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200729 return 0;
730
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100731 return ieee80211_is_robust_mgmt_frame(skb);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200732}
733
734
735static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
736{
737 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
738
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100739 if (!is_multicast_ether_addr(hdr->addr1))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200740 return 0;
741
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100742 return ieee80211_is_robust_mgmt_frame(skb);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200743}
744
745
746/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
747static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
748{
749 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
750 struct ieee80211_mmie *mmie;
Jouni Malinen56c52da2015-01-24 19:52:08 +0200751 struct ieee80211_mmie_16 *mmie16;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200752
Johannes Berg1df332e2012-10-26 00:09:11 +0200753 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200754 return -1;
755
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100756 if (!ieee80211_is_robust_mgmt_frame(skb))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200757 return -1; /* not a robust management frame */
758
759 mmie = (struct ieee80211_mmie *)
760 (skb->data + skb->len - sizeof(*mmie));
Jouni Malinen56c52da2015-01-24 19:52:08 +0200761 if (mmie->element_id == WLAN_EID_MMIE &&
762 mmie->length == sizeof(*mmie) - 2)
763 return le16_to_cpu(mmie->key_id);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200764
Jouni Malinen56c52da2015-01-24 19:52:08 +0200765 mmie16 = (struct ieee80211_mmie_16 *)
766 (skb->data + skb->len - sizeof(*mmie16));
767 if (skb->len >= 24 + sizeof(*mmie16) &&
768 mmie16->element_id == WLAN_EID_MMIE &&
769 mmie16->length == sizeof(*mmie16) - 2)
770 return le16_to_cpu(mmie16->key_id);
771
772 return -1;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200773}
774
Johannes Berg2c61cf92016-03-17 15:02:55 +0200775static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
776 struct sk_buff *skb)
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200777{
778 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
779 __le16 fc;
780 int hdrlen;
781 u8 keyid;
782
783 fc = hdr->frame_control;
784 hdrlen = ieee80211_hdrlen(fc);
785
786 if (skb->len < hdrlen + cs->hdr_len)
787 return -EINVAL;
788
789 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
790 keyid &= cs->key_idx_mask;
791 keyid >>= cs->key_idx_shift;
792
793 return keyid;
794}
795
Johannes Berg1df332e2012-10-26 00:09:11 +0200796static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100797{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700798 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg47846c92009-11-25 17:46:19 +0100799 char *dev_addr = rx->sdata->vif.addr;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100800
Harvey Harrisona7767f92008-07-02 16:30:51 -0700801 if (ieee80211_is_data(hdr->frame_control)) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700802 if (is_multicast_ether_addr(hdr->addr1)) {
803 if (ieee80211_has_tods(hdr->frame_control) ||
Johannes Berg1df332e2012-10-26 00:09:11 +0200804 !ieee80211_has_fromds(hdr->frame_control))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700805 return RX_DROP_MONITOR;
Joe Perchesb203ca32012-05-08 18:56:52 +0000806 if (ether_addr_equal(hdr->addr3, dev_addr))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700807 return RX_DROP_MONITOR;
808 } else {
809 if (!ieee80211_has_a4(hdr->frame_control))
810 return RX_DROP_MONITOR;
Joe Perchesb203ca32012-05-08 18:56:52 +0000811 if (ether_addr_equal(hdr->addr4, dev_addr))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700812 return RX_DROP_MONITOR;
813 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100814 }
815
816 /* If there is not an established peer link and this is not a peer link
817 * establisment frame, beacon or probe, drop the frame.
818 */
819
Javier Cardona57cf8042011-05-13 10:45:43 -0700820 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100821 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100822
Harvey Harrisona7767f92008-07-02 16:30:51 -0700823 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100824 return RX_DROP_MONITOR;
825
Harvey Harrisona7767f92008-07-02 16:30:51 -0700826 if (ieee80211_is_action(hdr->frame_control)) {
Javier Cardonad3aaec8a2011-05-03 16:57:09 -0700827 u8 category;
Johannes Berg9b395bc2012-10-26 00:36:40 +0200828
829 /* make sure category field is present */
830 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
831 return RX_DROP_MONITOR;
832
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100833 mgmt = (struct ieee80211_mgmt *)hdr;
Javier Cardonad3aaec8a2011-05-03 16:57:09 -0700834 category = mgmt->u.action.category;
835 if (category != WLAN_CATEGORY_MESH_ACTION &&
Johannes Berg1df332e2012-10-26 00:09:11 +0200836 category != WLAN_CATEGORY_SELF_PROTECTED)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100837 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100838 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100839 }
840
Harvey Harrisona7767f92008-07-02 16:30:51 -0700841 if (ieee80211_is_probe_req(hdr->frame_control) ||
842 ieee80211_is_probe_resp(hdr->frame_control) ||
Javier Cardona71839122011-04-07 15:08:31 -0700843 ieee80211_is_beacon(hdr->frame_control) ||
844 ieee80211_is_auth(hdr->frame_control))
Harvey Harrisona7767f92008-07-02 16:30:51 -0700845 return RX_CONTINUE;
846
847 return RX_DROP_MONITOR;
Harvey Harrisona7767f92008-07-02 16:30:51 -0700848 }
849
Johannes Berg902acc72008-02-23 15:17:19 +0100850 return RX_CONTINUE;
851}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100852
Johannes Bergfb4ea052016-01-28 16:19:24 +0200853static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
854 int index)
855{
856 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
857 struct sk_buff *tail = skb_peek_tail(frames);
858 struct ieee80211_rx_status *status;
859
Sara Sharon06470f72016-01-28 16:19:25 +0200860 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
861 return true;
862
Johannes Bergfb4ea052016-01-28 16:19:24 +0200863 if (!tail)
864 return false;
865
866 status = IEEE80211_SKB_RXCB(tail);
867 if (status->flag & RX_FLAG_AMSDU_MORE)
868 return false;
869
870 return true;
871}
872
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200873static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100874 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000875 int index,
876 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100877{
Michal Kazior83eb9352014-07-16 12:09:31 +0200878 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
879 struct sk_buff *skb;
Christian Lamparter4cfda472010-12-27 23:21:26 +0100880 struct ieee80211_rx_status *status;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100881
Johannes Bergdd318572010-11-29 11:09:16 +0100882 lockdep_assert_held(&tid_agg_rx->reorder_lock);
883
Michal Kazior83eb9352014-07-16 12:09:31 +0200884 if (skb_queue_empty(skb_list))
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100885 goto no_frame;
886
Johannes Bergfb4ea052016-01-28 16:19:24 +0200887 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
Michal Kazior83eb9352014-07-16 12:09:31 +0200888 __skb_queue_purge(skb_list);
889 goto no_frame;
890 }
891
892 /* release frames from the reorder ring buffer */
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100893 tid_agg_rx->stored_mpdu_num--;
Michal Kazior83eb9352014-07-16 12:09:31 +0200894 while ((skb = __skb_dequeue(skb_list))) {
895 status = IEEE80211_SKB_RXCB(skb);
896 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
897 __skb_queue_tail(frames, skb);
898 }
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100899
900no_frame:
Sara Sharon06470f72016-01-28 16:19:25 +0200901 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
Johannes Berg9a886582013-02-15 19:25:00 +0100902 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100903}
904
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200905static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100906 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000907 u16 head_seq_num,
908 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100909{
910 int index;
911
Johannes Bergdd318572010-11-29 11:09:16 +0100912 lockdep_assert_held(&tid_agg_rx->reorder_lock);
913
Johannes Berg9a886582013-02-15 19:25:00 +0100914 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
Karl Beldan2e3049b2013-10-24 15:53:32 +0200915 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000916 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
917 frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100918 }
919}
920
921/*
922 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
923 * the skb was added to the buffer longer than this time ago, the earlier
924 * frames that have not yet been received are assumed to be lost and the skb
925 * can be released for processing. This may also release other skb's from the
926 * reorder buffer if there are no additional gaps between the frames.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200927 *
928 * Callers must hold tid_agg_rx->reorder_lock.
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100929 */
930#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
931
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200932static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000933 struct tid_ampdu_rx *tid_agg_rx,
934 struct sk_buff_head *frames)
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200935{
Michal Kazior83eb9352014-07-16 12:09:31 +0200936 int index, i, j;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200937
Johannes Bergdd318572010-11-29 11:09:16 +0100938 lockdep_assert_held(&tid_agg_rx->reorder_lock);
939
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200940 /* release the buffer until next missing frame */
Karl Beldan2e3049b2013-10-24 15:53:32 +0200941 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Johannes Bergfb4ea052016-01-28 16:19:24 +0200942 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
Eliad Peller07ae2df2012-02-01 18:48:09 +0200943 tid_agg_rx->stored_mpdu_num) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200944 /*
945 * No buffers ready to be released, but check whether any
946 * frames in the reorder buffer have timed out.
947 */
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200948 int skipped = 1;
949 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
950 j = (j + 1) % tid_agg_rx->buf_size) {
Johannes Bergfb4ea052016-01-28 16:19:24 +0200951 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200952 skipped++;
953 continue;
954 }
Daniel Halperin499fe9a2011-03-24 16:01:48 -0700955 if (skipped &&
956 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200957 HT_RX_REORDER_BUF_TIMEOUT))
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200958 goto set_release_timer;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200959
Michal Kazior83eb9352014-07-16 12:09:31 +0200960 /* don't leave incomplete A-MSDUs around */
961 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
962 i = (i + 1) % tid_agg_rx->buf_size)
963 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
964
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200965 ht_dbg_ratelimited(sdata,
966 "release an RX reorder frame due to timeout on earlier frames\n");
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000967 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
968 frames);
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200969
970 /*
971 * Increment the head seq# also for the skipped slots.
972 */
973 tid_agg_rx->head_seq_num =
Johannes Berg9a886582013-02-15 19:25:00 +0100974 (tid_agg_rx->head_seq_num +
975 skipped) & IEEE80211_SN_MASK;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200976 skipped = 0;
977 }
Johannes Bergfb4ea052016-01-28 16:19:24 +0200978 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000979 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
980 frames);
Karl Beldan2e3049b2013-10-24 15:53:32 +0200981 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200982 }
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200983
984 if (tid_agg_rx->stored_mpdu_num) {
Karl Beldan2e3049b2013-10-24 15:53:32 +0200985 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200986
987 for (; j != (index - 1) % tid_agg_rx->buf_size;
988 j = (j + 1) % tid_agg_rx->buf_size) {
Johannes Bergfb4ea052016-01-28 16:19:24 +0200989 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200990 break;
991 }
992
993 set_release_timer:
994
Johannes Berg788211d2015-04-01 14:20:42 +0200995 if (!tid_agg_rx->removed)
996 mod_timer(&tid_agg_rx->reorder_timer,
997 tid_agg_rx->reorder_time[j] + 1 +
998 HT_RX_REORDER_BUF_TIMEOUT);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200999 } else {
1000 del_timer(&tid_agg_rx->reorder_timer);
1001 }
Christian Lamparteraa0c8632010-08-05 01:36:04 +02001002}
1003
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001004/*
1005 * As this function belongs to the RX path it must be under
1006 * rcu_read_lock protection. It returns false if the frame
1007 * can be processed immediately, true if it was consumed.
1008 */
Johannes Bergd3b2fb52012-06-22 12:48:38 +02001009static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001010 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +00001011 struct sk_buff *skb,
1012 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001013{
1014 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Michal Kazior83eb9352014-07-16 12:09:31 +02001015 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001016 u16 sc = le16_to_cpu(hdr->seq_ctrl);
1017 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1018 u16 head_seq_num, buf_size;
1019 int index;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001020 bool ret = true;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001021
Johannes Bergdd318572010-11-29 11:09:16 +01001022 spin_lock(&tid_agg_rx->reorder_lock);
1023
Michal Kazior4549cf22014-09-02 14:05:10 +02001024 /*
1025 * Offloaded BA sessions have no known starting sequence number so pick
1026 * one from first Rxed frame for this tid after BA was started.
1027 */
1028 if (unlikely(tid_agg_rx->auto_seq)) {
1029 tid_agg_rx->auto_seq = false;
1030 tid_agg_rx->ssn = mpdu_seq_num;
1031 tid_agg_rx->head_seq_num = mpdu_seq_num;
1032 }
1033
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001034 buf_size = tid_agg_rx->buf_size;
1035 head_seq_num = tid_agg_rx->head_seq_num;
1036
1037 /* frame with out of date sequence number */
Johannes Berg9a886582013-02-15 19:25:00 +01001038 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001039 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001040 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001041 }
1042
1043 /*
1044 * If frame the sequence number exceeds our buffering window
1045 * size release some previous frames to make room for this one.
1046 */
Johannes Berg9a886582013-02-15 19:25:00 +01001047 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1048 head_seq_num = ieee80211_sn_inc(
1049 ieee80211_sn_sub(mpdu_seq_num, buf_size));
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001050 /* release stored frames up to new head to stack */
Johannes Bergd3b2fb52012-06-22 12:48:38 +02001051 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +00001052 head_seq_num, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001053 }
1054
1055 /* Now the new frame is always in the range of the reordering buffer */
1056
Karl Beldan2e3049b2013-10-24 15:53:32 +02001057 index = mpdu_seq_num % tid_agg_rx->buf_size;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001058
1059 /* check if we already stored this frame */
Johannes Bergfb4ea052016-01-28 16:19:24 +02001060 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001061 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001062 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001063 }
1064
1065 /*
1066 * If the current MPDU is in the right order and nothing else
1067 * is stored we can process it directly, no need to buffer it.
Johannes Bergc835b212011-03-15 23:17:01 +01001068 * If it is first but there's something stored, we may be able
1069 * to release frames after this one.
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001070 */
1071 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1072 tid_agg_rx->stored_mpdu_num == 0) {
Michal Kazior83eb9352014-07-16 12:09:31 +02001073 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1074 tid_agg_rx->head_seq_num =
1075 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001076 ret = false;
1077 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001078 }
1079
1080 /* put the frame in the reordering buffer */
Michal Kazior83eb9352014-07-16 12:09:31 +02001081 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1082 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1083 tid_agg_rx->reorder_time[index] = jiffies;
1084 tid_agg_rx->stored_mpdu_num++;
1085 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1086 }
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001087
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001088 out:
1089 spin_unlock(&tid_agg_rx->reorder_lock);
1090 return ret;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001091}
1092
1093/*
1094 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1095 * true if the MPDU was buffered, false if it should be processed.
1096 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +00001097static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1098 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001099{
Johannes Berg2569a822009-11-25 17:46:17 +01001100 struct sk_buff *skb = rx->skb;
1101 struct ieee80211_local *local = rx->local;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001102 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Johannes Berg2569a822009-11-25 17:46:17 +01001103 struct sta_info *sta = rx->sta;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001104 struct tid_ampdu_rx *tid_agg_rx;
1105 u16 sc;
Thomas Pedersen6cc00d52011-11-03 21:11:11 -07001106 u8 tid, ack_policy;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001107
Johannes Berg051a41f2013-11-20 11:28:27 +01001108 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1109 is_multicast_ether_addr(hdr->addr1))
Johannes Berg2569a822009-11-25 17:46:17 +01001110 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001111
1112 /*
1113 * filter the QoS data rx stream according to
1114 * STA/TID and check if this STA/TID is on aggregation
1115 */
1116
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001117 if (!sta)
Johannes Berg2569a822009-11-25 17:46:17 +01001118 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001119
Thomas Pedersen6cc00d52011-11-03 21:11:11 -07001120 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1121 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001122 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1123
Johannes Berga87f7362010-06-10 10:21:38 +02001124 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
Johannes Bergbfe40fa2016-08-29 23:25:18 +03001125 if (!tid_agg_rx) {
1126 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1127 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1128 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1129 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1130 WLAN_BACK_RECIPIENT,
1131 WLAN_REASON_QSTA_REQUIRE_SETUP);
Johannes Berga87f7362010-06-10 10:21:38 +02001132 goto dont_reorder;
Johannes Bergbfe40fa2016-08-29 23:25:18 +03001133 }
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001134
1135 /* qos null data frames are excluded */
1136 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Johannes Berga87f7362010-06-10 10:21:38 +02001137 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001138
Thomas Pedersen6cc00d52011-11-03 21:11:11 -07001139 /* not part of a BA session */
1140 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1141 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1142 goto dont_reorder;
1143
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001144 /* new, potentially un-ordered, ampdu frame - process it */
1145
1146 /* reset session timer */
1147 if (tid_agg_rx->timeout)
Felix Fietkau12d3952f2012-03-18 22:58:06 +01001148 tid_agg_rx->last_rx = jiffies;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001149
1150 /* if this mpdu is fragmented - terminate rx aggregation session */
1151 sc = le16_to_cpu(hdr->seq_ctrl);
1152 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Bergc1475ca2010-06-10 10:21:37 +02001153 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg344eec62010-06-10 10:21:36 +02001154 skb_queue_tail(&rx->sdata->skb_queue, skb);
1155 ieee80211_queue_work(&local->hw, &rx->sdata->work);
Johannes Berg2569a822009-11-25 17:46:17 +01001156 return;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001157 }
1158
Johannes Berga87f7362010-06-10 10:21:38 +02001159 /*
1160 * No locking needed -- we will only ever process one
1161 * RX packet at a time, and thus own tid_agg_rx. All
1162 * other code manipulating it needs to (and does) make
1163 * sure that we cannot get to it any more before doing
1164 * anything with it.
1165 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +00001166 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1167 frames))
Johannes Berg2569a822009-11-25 17:46:17 +01001168 return;
1169
1170 dont_reorder:
Christian Lamparterf9e124f2013-02-04 17:44:44 +00001171 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001172}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001173
Johannes Berg49461622008-06-30 15:10:45 +02001174static ieee80211_rx_result debug_noinline
Johannes Berg03954422014-11-11 16:49:25 +01001175ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001176{
Harvey Harrisona7767f92008-07-02 16:30:51 -07001177 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02001178 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001179
Sara Sharonf9cfa5f2015-12-08 16:04:33 +02001180 if (status->flag & RX_FLAG_DUP_VALIDATED)
1181 return RX_CONTINUE;
1182
Johannes Berg6b0f3272013-07-11 22:33:26 +02001183 /*
1184 * Drop duplicate 802.11 retransmissions
1185 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1186 */
Johannes Berg03954422014-11-11 16:49:25 +01001187
1188 if (rx->skb->len < 24)
1189 return RX_CONTINUE;
1190
1191 if (ieee80211_is_ctl(hdr->frame_control) ||
1192 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1193 is_multicast_ether_addr(hdr->addr1))
1194 return RX_CONTINUE;
1195
Johannes Berga732fa72015-10-14 18:27:07 +02001196 if (!rx->sta)
1197 return RX_CONTINUE;
1198
1199 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1200 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1201 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001202 rx->sta->rx_stats.num_duplicates++;
Johannes Berga732fa72015-10-14 18:27:07 +02001203 return RX_DROP_UNUSABLE;
1204 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1205 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +02001206 }
1207
Johannes Berg03954422014-11-11 16:49:25 +01001208 return RX_CONTINUE;
1209}
1210
1211static ieee80211_rx_result debug_noinline
1212ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1213{
1214 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1215
Johannes Berg571ecf62007-07-27 15:43:22 +02001216 /* Drop disallowed frame classes based on STA auth/assoc state;
1217 * IEEE 802.11, Chap 5.5.
1218 *
Johannes Bergccd7b362008-09-11 00:01:56 +02001219 * mac80211 filters only based on association state, i.e. it drops
1220 * Class 3 frames from not associated stations. hostapd sends
Johannes Berg571ecf62007-07-27 15:43:22 +02001221 * deauth/disassoc frames when needed. In addition, hostapd is
1222 * responsible for filtering on both auth and assoc states.
1223 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001224
Johannes Berg902acc72008-02-23 15:17:19 +01001225 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001226 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001227
Harvey Harrisona7767f92008-07-02 16:30:51 -07001228 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1229 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001230 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Bill Jordan1be7fe82010-10-01 11:20:41 -04001231 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
Rostislav Lisovy239281f2014-11-03 10:33:19 +01001232 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001233 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
Johannes Berg7852e362012-01-20 13:55:24 +01001234 /*
1235 * accept port control frames from the AP even when it's not
1236 * yet marked ASSOC to prevent a race where we don't set the
1237 * assoc bit quickly enough before it sends the first frame
1238 */
1239 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
Guy Eilam2a33bee2011-08-17 15:18:15 +03001240 ieee80211_is_data_present(hdr->frame_control)) {
Johannes Berg6dbda2d2012-10-26 00:41:23 +02001241 unsigned int hdrlen;
1242 __be16 ethertype;
Guy Eilam2a33bee2011-08-17 15:18:15 +03001243
Johannes Berg6dbda2d2012-10-26 00:41:23 +02001244 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1245
1246 if (rx->skb->len < hdrlen + 8)
1247 return RX_DROP_MONITOR;
1248
1249 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1250 if (ethertype == rx->sdata->control_port_protocol)
Guy Eilam2a33bee2011-08-17 15:18:15 +03001251 return RX_CONTINUE;
1252 }
Johannes Berg21fc7562011-11-04 11:18:13 +01001253
1254 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1255 cfg80211_rx_spurious_frame(rx->sdata->dev,
1256 hdr->addr2,
1257 GFP_ATOMIC))
1258 return RX_DROP_UNUSABLE;
1259
Johannes Berge4c26ad2008-01-31 19:48:21 +01001260 return RX_DROP_MONITOR;
Guy Eilam2a33bee2011-08-17 15:18:15 +03001261 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001262
Johannes Berg9ae54c82008-01-31 19:48:20 +01001263 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +02001264}
1265
1266
Johannes Berg49461622008-06-30 15:10:45 +02001267static ieee80211_rx_result debug_noinline
Kalle Valo572e0012009-02-10 17:09:31 +02001268ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1269{
1270 struct ieee80211_local *local;
1271 struct ieee80211_hdr *hdr;
1272 struct sk_buff *skb;
1273
1274 local = rx->local;
1275 skb = rx->skb;
1276 hdr = (struct ieee80211_hdr *) skb->data;
1277
1278 if (!local->pspolling)
1279 return RX_CONTINUE;
1280
1281 if (!ieee80211_has_fromds(hdr->frame_control))
1282 /* this is not from AP */
1283 return RX_CONTINUE;
1284
1285 if (!ieee80211_is_data(hdr->frame_control))
1286 return RX_CONTINUE;
1287
1288 if (!ieee80211_has_moredata(hdr->frame_control)) {
1289 /* AP has no more frames buffered for us */
1290 local->pspolling = false;
1291 return RX_CONTINUE;
1292 }
1293
1294 /* more data bit is set, let's request a new frame from the AP */
1295 ieee80211_send_pspoll(local, rx->sdata);
1296
1297 return RX_CONTINUE;
1298}
1299
Marco Porschd012a602012-10-10 12:39:50 -07001300static void sta_ps_start(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001301{
Johannes Berg133b8222008-09-16 14:18:59 +02001302 struct ieee80211_sub_if_data *sdata = sta->sdata;
Christian Lamparter4571d3b2008-11-30 00:48:41 +01001303 struct ieee80211_local *local = sdata->local;
Marco Porschd012a602012-10-10 12:39:50 -07001304 struct ps_data *ps;
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001305 int tid;
Joe Perches0795af52007-10-03 17:59:30 -07001306
Marco Porschd012a602012-10-10 12:39:50 -07001307 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1308 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1309 ps = &sdata->bss->ps;
1310 else
1311 return;
1312
1313 atomic_inc(&ps->num_sta_ps);
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001314 set_sta_flag(sta, WLAN_STA_PS_STA);
Johannes Berg30686bf2015-06-02 21:39:54 +02001315 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001316 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001317 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1318 sta->sta.addr, sta->sta.aid);
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001319
Johannes Berg17c18bf2015-03-21 15:25:43 +01001320 ieee80211_clear_fast_xmit(sta);
1321
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001322 if (!sta->sta.txq[0])
1323 return;
1324
1325 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02001326 if (txq_has_queue(sta->sta.txq[tid]))
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001327 set_bit(tid, &sta->txq_buffered_tids);
1328 else
1329 clear_bit(tid, &sta->txq_buffered_tids);
1330 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001331}
1332
Marco Porschd012a602012-10-10 12:39:50 -07001333static void sta_ps_end(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001334{
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001335 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1336 sta->sta.addr, sta->sta.aid);
Johannes Berg004c8722008-02-20 11:21:35 +01001337
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001338 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
Johannes Berge3685e02014-02-20 11:19:58 +01001339 /*
1340 * Clear the flag only if the other one is still set
1341 * so that the TX path won't start TX'ing new frames
1342 * directly ... In the case that the driver flag isn't
1343 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1344 */
1345 clear_sta_flag(sta, WLAN_STA_PS_STA);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001346 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1347 sta->sta.addr, sta->sta.aid);
Johannes Bergaf818582009-11-06 11:35:50 +01001348 return;
1349 }
1350
Johannes Berg5ac2e352014-05-27 16:32:27 +02001351 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1352 clear_sta_flag(sta, WLAN_STA_PS_STA);
Johannes Bergaf818582009-11-06 11:35:50 +01001353 ieee80211_sta_ps_deliver_wakeup(sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001354}
1355
Johannes Bergcf471612015-06-16 16:16:38 +02001356int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001357{
Johannes Bergcf471612015-06-16 16:16:38 +02001358 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001359 bool in_ps;
1360
Johannes Bergcf471612015-06-16 16:16:38 +02001361 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001362
1363 /* Don't let the same PS state be set twice */
Johannes Bergcf471612015-06-16 16:16:38 +02001364 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001365 if ((start && in_ps) || (!start && !in_ps))
1366 return -EINVAL;
1367
1368 if (start)
Johannes Bergcf471612015-06-16 16:16:38 +02001369 sta_ps_start(sta);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001370 else
Johannes Bergcf471612015-06-16 16:16:38 +02001371 sta_ps_end(sta);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001372
1373 return 0;
1374}
1375EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1376
Johannes Berg46fa38e2016-05-03 16:58:00 +03001377void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1378{
1379 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1380
1381 if (test_sta_flag(sta, WLAN_STA_SP))
1382 return;
1383
1384 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1385 ieee80211_sta_ps_deliver_poll_response(sta);
1386 else
1387 set_sta_flag(sta, WLAN_STA_PSPOLL);
1388}
1389EXPORT_SYMBOL(ieee80211_sta_pspoll);
1390
1391void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1392{
1393 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1394 u8 ac = ieee802_1d_to_ac[tid & 7];
1395
1396 /*
1397 * If this AC is not trigger-enabled do nothing.
1398 *
1399 * NB: This could/should check a separate bitmap of trigger-
1400 * enabled queues, but for now we only implement uAPSD w/o
1401 * TSPEC changes to the ACs, so they're always the same.
1402 */
1403 if (!(sta->sta.uapsd_queues & BIT(ac)))
1404 return;
1405
1406 /* if we are in a service period, do nothing */
1407 if (test_sta_flag(sta, WLAN_STA_SP))
1408 return;
1409
1410 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1411 ieee80211_sta_ps_deliver_uapsd(sta);
1412 else
1413 set_sta_flag(sta, WLAN_STA_UAPSD);
1414}
1415EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1416
Johannes Berg49461622008-06-30 15:10:45 +02001417static ieee80211_rx_result debug_noinline
Johannes Berg47086fc2011-09-29 16:04:33 +02001418ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1419{
1420 struct ieee80211_sub_if_data *sdata = rx->sdata;
1421 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1422 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg47086fc2011-09-29 16:04:33 +02001423
Johannes Berg5c900672015-04-22 14:48:34 +02001424 if (!rx->sta)
Johannes Berg47086fc2011-09-29 16:04:33 +02001425 return RX_CONTINUE;
1426
1427 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1428 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1429 return RX_CONTINUE;
1430
1431 /*
1432 * The device handles station powersave, so don't do anything about
1433 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1434 * it to mac80211 since they're handled.)
1435 */
Johannes Berg30686bf2015-06-02 21:39:54 +02001436 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
Johannes Berg47086fc2011-09-29 16:04:33 +02001437 return RX_CONTINUE;
1438
1439 /*
1440 * Don't do anything if the station isn't already asleep. In
1441 * the uAPSD case, the station will probably be marked asleep,
1442 * in the PS-Poll case the station must be confused ...
1443 */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001444 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
Johannes Berg47086fc2011-09-29 16:04:33 +02001445 return RX_CONTINUE;
1446
1447 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
Johannes Berg46fa38e2016-05-03 16:58:00 +03001448 ieee80211_sta_pspoll(&rx->sta->sta);
Johannes Berg47086fc2011-09-29 16:04:33 +02001449
1450 /* Free PS Poll skb here instead of returning RX_DROP that would
1451 * count as an dropped frame. */
1452 dev_kfree_skb(rx->skb);
1453
1454 return RX_QUEUED;
1455 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1456 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1457 ieee80211_has_pm(hdr->frame_control) &&
1458 (ieee80211_is_data_qos(hdr->frame_control) ||
1459 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
Johannes Berg46fa38e2016-05-03 16:58:00 +03001460 u8 tid;
1461
Johannes Berg47086fc2011-09-29 16:04:33 +02001462 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
Johannes Berg47086fc2011-09-29 16:04:33 +02001463
Johannes Berg46fa38e2016-05-03 16:58:00 +03001464 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
Johannes Berg47086fc2011-09-29 16:04:33 +02001465 }
1466
1467 return RX_CONTINUE;
1468}
1469
1470static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001471ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001472{
1473 struct sta_info *sta = rx->sta;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001474 struct sk_buff *skb = rx->skb;
1475 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1476 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Felix Fietkauef0621e2013-04-22 16:29:31 +02001477 int i;
Johannes Berg571ecf62007-07-27 15:43:22 +02001478
1479 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001480 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001481
Johannes Bergb291ba12009-07-10 15:29:03 +02001482 /*
1483 * Update last_rx only for IBSS packets which are for the current
Antonio Quartullie584da5e2012-11-25 23:13:42 +01001484 * BSSID and for station already AUTHORIZED to avoid keeping the
1485 * current IBSS network alive in cases where other STAs start
1486 * using different BSSID. This will also give the station another
1487 * chance to restart the authentication/authorization in case
1488 * something went wrong the first time.
Johannes Bergb291ba12009-07-10 15:29:03 +02001489 */
Johannes Berg05c914f2008-09-11 00:01:58 +02001490 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001491 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +02001492 NL80211_IFTYPE_ADHOC);
Antonio Quartullie584da5e2012-11-25 23:13:42 +01001493 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1494 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001495 sta->rx_stats.last_rx = jiffies;
Henning Roggef4ebddf2014-05-01 10:03:46 +02001496 if (ieee80211_is_data(hdr->frame_control) &&
Johannes Berg4f6b1b32016-03-31 20:02:08 +03001497 !is_multicast_ether_addr(hdr->addr1))
1498 sta->rx_stats.last_rate =
1499 sta_stats_encode_rate(status);
Felix Fietkau3af63342011-02-27 22:08:01 +01001500 }
Rostislav Lisovy239281f2014-11-03 10:33:19 +01001501 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001502 sta->rx_stats.last_rx = jiffies;
Johannes Bergb291ba12009-07-10 15:29:03 +02001503 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1504 /*
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001505 * Mesh beacons will update last_rx when if they are found to
1506 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +02001507 */
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001508 sta->rx_stats.last_rx = jiffies;
Johannes Berg4f6b1b32016-03-31 20:02:08 +03001509 if (ieee80211_is_data(hdr->frame_control))
1510 sta->rx_stats.last_rate = sta_stats_encode_rate(status);
Johannes Berg571ecf62007-07-27 15:43:22 +02001511 }
1512
Kalle Valo3cf335d2009-03-22 21:57:06 +02001513 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1514 ieee80211_sta_rx_notify(rx->sdata, hdr);
1515
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001516 sta->rx_stats.fragments++;
Johannes Berg0f9c5a62016-03-31 20:02:09 +03001517
1518 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001519 sta->rx_stats.bytes += rx->skb->len;
Johannes Berg0f9c5a62016-03-31 20:02:09 +03001520 u64_stats_update_end(&rx->sta->rx_stats.syncp);
1521
Felix Fietkaufe8431f2012-03-01 18:00:07 +01001522 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001523 sta->rx_stats.last_signal = status->signal;
Johannes Berg0be6ed12016-03-31 20:02:05 +03001524 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
Felix Fietkaufe8431f2012-03-01 18:00:07 +01001525 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001526
Felix Fietkauef0621e2013-04-22 16:29:31 +02001527 if (status->chains) {
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001528 sta->rx_stats.chains = status->chains;
Felix Fietkauef0621e2013-04-22 16:29:31 +02001529 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1530 int signal = status->chain_signal[i];
1531
1532 if (!(status->chains & BIT(i)))
1533 continue;
1534
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001535 sta->rx_stats.chain_signal_last[i] = signal;
Johannes Berg0be6ed12016-03-31 20:02:05 +03001536 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001537 -signal);
Felix Fietkauef0621e2013-04-22 16:29:31 +02001538 }
1539 }
1540
Johannes Berg72eaa432008-11-26 15:02:58 +01001541 /*
1542 * Change STA power saving mode only at the end of a frame
1543 * exchange sequence.
1544 */
Johannes Berg30686bf2015-06-02 21:39:54 +02001545 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001546 !ieee80211_has_morefrags(hdr->frame_control) &&
Christian Lamparter4cfda472010-12-27 23:21:26 +01001547 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001548 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
Johannes Bergb4ba5442014-01-24 14:41:44 +01001549 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1550 /* PM bit is only checked in frames where it isn't reserved,
1551 * in AP mode it's reserved in non-bufferable management frames
1552 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1553 */
1554 (!ieee80211_is_mgmt(hdr->frame_control) ||
1555 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001556 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
Johannes Bergb4ba5442014-01-24 14:41:44 +01001557 if (!ieee80211_has_pm(hdr->frame_control))
Marco Porschd012a602012-10-10 12:39:50 -07001558 sta_ps_end(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001559 } else {
1560 if (ieee80211_has_pm(hdr->frame_control))
Marco Porschd012a602012-10-10 12:39:50 -07001561 sta_ps_start(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001562 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001563 }
1564
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001565 /* mesh power save support */
1566 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1567 ieee80211_mps_rx_h_sta_process(sta, hdr);
1568
Johannes Berg22403de2009-10-30 12:55:03 +01001569 /*
1570 * Drop (qos-)data::nullfunc frames silently, since they
1571 * are used only to control station power saving mode.
1572 */
1573 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1574 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001575 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
Felix Fietkaud5242152010-01-08 18:06:26 +01001576
1577 /*
1578 * If we receive a 4-addr nullfunc frame from a STA
Johannes Berge7f4a942011-11-04 11:18:20 +01001579 * that was not moved to a 4-addr STA vlan yet send
1580 * the event to userspace and for older hostapd drop
1581 * the frame to the monitor interface.
Felix Fietkaud5242152010-01-08 18:06:26 +01001582 */
1583 if (ieee80211_has_a4(hdr->frame_control) &&
1584 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1585 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
Johannes Berge7f4a942011-11-04 11:18:20 +01001586 !rx->sdata->u.vlan.sta))) {
1587 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1588 cfg80211_rx_unexpected_4addr_frame(
1589 rx->sdata->dev, sta->sta.addr,
1590 GFP_ATOMIC);
Felix Fietkaud5242152010-01-08 18:06:26 +01001591 return RX_DROP_MONITOR;
Johannes Berge7f4a942011-11-04 11:18:20 +01001592 }
Johannes Berg22403de2009-10-30 12:55:03 +01001593 /*
1594 * Update counter and free packet here to avoid
1595 * counting this as a dropped packed.
1596 */
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001597 sta->rx_stats.packets++;
Johannes Berg571ecf62007-07-27 15:43:22 +02001598 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001599 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001600 }
1601
Johannes Berg9ae54c82008-01-31 19:48:20 +01001602 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001603} /* ieee80211_rx_h_sta_process */
1604
Johan Almbladh86c228a2013-08-14 15:29:46 +02001605static ieee80211_rx_result debug_noinline
1606ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1607{
1608 struct sk_buff *skb = rx->skb;
1609 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1610 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1611 int keyidx;
1612 int hdrlen;
1613 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1614 struct ieee80211_key *sta_ptk = NULL;
1615 int mmie_keyidx = -1;
1616 __le16 fc;
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001617 const struct ieee80211_cipher_scheme *cs = NULL;
Johan Almbladh86c228a2013-08-14 15:29:46 +02001618
1619 /*
1620 * Key selection 101
1621 *
1622 * There are four types of keys:
1623 * - GTK (group keys)
1624 * - IGTK (group keys for management frames)
1625 * - PTK (pairwise keys)
1626 * - STK (station-to-station pairwise keys)
1627 *
1628 * When selecting a key, we have to distinguish between multicast
1629 * (including broadcast) and unicast frames, the latter can only
1630 * use PTKs and STKs while the former always use GTKs and IGTKs.
1631 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1632 * unicast frames can also use key indices like GTKs. Hence, if we
1633 * don't have a PTK/STK we check the key index for a WEP key.
1634 *
1635 * Note that in a regular BSS, multicast frames are sent by the
1636 * AP only, associated stations unicast the frame to the AP first
1637 * which then multicasts it on their behalf.
1638 *
1639 * There is also a slight problem in IBSS mode: GTKs are negotiated
1640 * with each station, that is something we don't currently handle.
1641 * The spec seems to expect that one negotiates the same key with
1642 * every station but there's no such requirement; VLANs could be
1643 * possible.
1644 */
1645
Johan Almbladh86c228a2013-08-14 15:29:46 +02001646 /* start without a key */
1647 rx->key = NULL;
Johan Almbladh86c228a2013-08-14 15:29:46 +02001648 fc = hdr->frame_control;
1649
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001650 if (rx->sta) {
1651 int keyid = rx->sta->ptk_idx;
1652
1653 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1654 cs = rx->sta->cipher_scheme;
Johannes Berg2c61cf92016-03-17 15:02:55 +02001655 keyid = ieee80211_get_cs_keyid(cs, rx->skb);
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001656 if (unlikely(keyid < 0))
1657 return RX_DROP_UNUSABLE;
1658 }
1659 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1660 }
1661
Johan Almbladh86c228a2013-08-14 15:29:46 +02001662 if (!ieee80211_has_protected(fc))
1663 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1664
1665 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1666 rx->key = sta_ptk;
1667 if ((status->flag & RX_FLAG_DECRYPTED) &&
1668 (status->flag & RX_FLAG_IV_STRIPPED))
1669 return RX_CONTINUE;
1670 /* Skip decryption if the frame is not protected. */
1671 if (!ieee80211_has_protected(fc))
1672 return RX_CONTINUE;
1673 } else if (mmie_keyidx >= 0) {
1674 /* Broadcast/multicast robust management frame / BIP */
1675 if ((status->flag & RX_FLAG_DECRYPTED) &&
1676 (status->flag & RX_FLAG_IV_STRIPPED))
1677 return RX_CONTINUE;
1678
1679 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1680 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1681 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
Masashi Honma46f6b062016-06-22 19:55:20 +09001682 if (rx->sta) {
1683 if (ieee80211_is_group_privacy_action(skb) &&
1684 test_sta_flag(rx->sta, WLAN_STA_MFP))
1685 return RX_DROP_MONITOR;
1686
Johan Almbladh86c228a2013-08-14 15:29:46 +02001687 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
Masashi Honma46f6b062016-06-22 19:55:20 +09001688 }
Johan Almbladh86c228a2013-08-14 15:29:46 +02001689 if (!rx->key)
1690 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1691 } else if (!ieee80211_has_protected(fc)) {
1692 /*
1693 * The frame was not protected, so skip decryption. However, we
1694 * need to set rx->key if there is a key that could have been
1695 * used so that the frame may be dropped if encryption would
1696 * have been expected.
1697 */
1698 struct ieee80211_key *key = NULL;
1699 struct ieee80211_sub_if_data *sdata = rx->sdata;
1700 int i;
1701
1702 if (ieee80211_is_mgmt(fc) &&
1703 is_multicast_ether_addr(hdr->addr1) &&
1704 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1705 rx->key = key;
1706 else {
1707 if (rx->sta) {
1708 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1709 key = rcu_dereference(rx->sta->gtk[i]);
1710 if (key)
1711 break;
1712 }
1713 }
1714 if (!key) {
1715 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1716 key = rcu_dereference(sdata->keys[i]);
1717 if (key)
1718 break;
1719 }
1720 }
1721 if (key)
1722 rx->key = key;
1723 }
1724 return RX_CONTINUE;
1725 } else {
1726 u8 keyid;
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001727
Johan Almbladh86c228a2013-08-14 15:29:46 +02001728 /*
1729 * The device doesn't give us the IV so we won't be
1730 * able to look up the key. That's ok though, we
1731 * don't need to decrypt the frame, we just won't
1732 * be able to keep statistics accurate.
1733 * Except for key threshold notifications, should
1734 * we somehow allow the driver to tell us which key
1735 * the hardware used if this flag is set?
1736 */
1737 if ((status->flag & RX_FLAG_DECRYPTED) &&
1738 (status->flag & RX_FLAG_IV_STRIPPED))
1739 return RX_CONTINUE;
1740
1741 hdrlen = ieee80211_hdrlen(fc);
1742
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001743 if (cs) {
Johannes Berg2c61cf92016-03-17 15:02:55 +02001744 keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
Johan Almbladh86c228a2013-08-14 15:29:46 +02001745
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001746 if (unlikely(keyidx < 0))
1747 return RX_DROP_UNUSABLE;
1748 } else {
1749 if (rx->skb->len < 8 + hdrlen)
1750 return RX_DROP_UNUSABLE; /* TODO: count this? */
1751 /*
1752 * no need to call ieee80211_wep_get_keyidx,
1753 * it verifies a bunch of things we've done already
1754 */
1755 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1756 keyidx = keyid >> 6;
1757 }
Johan Almbladh86c228a2013-08-14 15:29:46 +02001758
1759 /* check per-station GTK first, if multicast packet */
1760 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1761 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1762
1763 /* if not found, try default key */
1764 if (!rx->key) {
1765 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1766
1767 /*
1768 * RSNA-protected unicast frames should always be
1769 * sent with pairwise or station-to-station keys,
1770 * but for WEP we allow using a key index as well.
1771 */
1772 if (rx->key &&
1773 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1774 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1775 !is_multicast_ether_addr(hdr->addr1))
1776 rx->key = NULL;
1777 }
1778 }
1779
1780 if (rx->key) {
1781 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1782 return RX_DROP_MONITOR;
1783
Johan Almbladh86c228a2013-08-14 15:29:46 +02001784 /* TODO: add threshold stuff again */
1785 } else {
1786 return RX_DROP_MONITOR;
1787 }
1788
1789 switch (rx->key->conf.cipher) {
1790 case WLAN_CIPHER_SUITE_WEP40:
1791 case WLAN_CIPHER_SUITE_WEP104:
1792 result = ieee80211_crypto_wep_decrypt(rx);
1793 break;
1794 case WLAN_CIPHER_SUITE_TKIP:
1795 result = ieee80211_crypto_tkip_decrypt(rx);
1796 break;
1797 case WLAN_CIPHER_SUITE_CCMP:
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +02001798 result = ieee80211_crypto_ccmp_decrypt(
1799 rx, IEEE80211_CCMP_MIC_LEN);
1800 break;
1801 case WLAN_CIPHER_SUITE_CCMP_256:
1802 result = ieee80211_crypto_ccmp_decrypt(
1803 rx, IEEE80211_CCMP_256_MIC_LEN);
Johan Almbladh86c228a2013-08-14 15:29:46 +02001804 break;
1805 case WLAN_CIPHER_SUITE_AES_CMAC:
1806 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1807 break;
Jouni Malinen56c52da2015-01-24 19:52:08 +02001808 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1809 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1810 break;
Jouni Malinen8ade5382015-01-24 19:52:09 +02001811 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1812 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1813 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1814 break;
Jouni Malinen00b9cfa2015-01-24 19:52:06 +02001815 case WLAN_CIPHER_SUITE_GCMP:
1816 case WLAN_CIPHER_SUITE_GCMP_256:
1817 result = ieee80211_crypto_gcmp_decrypt(rx);
1818 break;
Johan Almbladh86c228a2013-08-14 15:29:46 +02001819 default:
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001820 result = ieee80211_crypto_hw_decrypt(rx);
Johan Almbladh86c228a2013-08-14 15:29:46 +02001821 }
1822
1823 /* the hdr variable is invalid after the decrypt handlers */
1824
1825 /* either the frame has been decrypted or will be dropped */
1826 status->flag |= RX_FLAG_DECRYPTED;
1827
1828 return result;
1829}
1830
Johannes Berg571ecf62007-07-27 15:43:22 +02001831static inline struct ieee80211_fragment_entry *
1832ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1833 unsigned int frag, unsigned int seq, int rx_queue,
1834 struct sk_buff **skb)
1835{
1836 struct ieee80211_fragment_entry *entry;
Johannes Berg571ecf62007-07-27 15:43:22 +02001837
Johannes Berg571ecf62007-07-27 15:43:22 +02001838 entry = &sdata->fragments[sdata->fragment_next++];
1839 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1840 sdata->fragment_next = 0;
1841
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001842 if (!skb_queue_empty(&entry->skb_list))
Johannes Berg571ecf62007-07-27 15:43:22 +02001843 __skb_queue_purge(&entry->skb_list);
Johannes Berg571ecf62007-07-27 15:43:22 +02001844
1845 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1846 *skb = NULL;
1847 entry->first_frag_time = jiffies;
1848 entry->seq = seq;
1849 entry->rx_queue = rx_queue;
1850 entry->last_frag = frag;
Johannes Berg9acc54b2016-02-26 22:13:40 +01001851 entry->check_sequential_pn = false;
Johannes Berg571ecf62007-07-27 15:43:22 +02001852 entry->extra_len = 0;
1853
1854 return entry;
1855}
1856
1857static inline struct ieee80211_fragment_entry *
1858ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001859 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +02001860 int rx_queue, struct ieee80211_hdr *hdr)
1861{
1862 struct ieee80211_fragment_entry *entry;
1863 int i, idx;
1864
1865 idx = sdata->fragment_next;
1866 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1867 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +02001868
1869 idx--;
1870 if (idx < 0)
1871 idx = IEEE80211_FRAGMENT_MAX - 1;
1872
1873 entry = &sdata->fragments[idx];
1874 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1875 entry->rx_queue != rx_queue ||
1876 entry->last_frag + 1 != frag)
1877 continue;
1878
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001879 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001880
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001881 /*
1882 * Check ftype and addresses are equal, else check next fragment
1883 */
1884 if (((hdr->frame_control ^ f_hdr->frame_control) &
1885 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Joe Perchesb203ca32012-05-08 18:56:52 +00001886 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1887 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
Johannes Berg571ecf62007-07-27 15:43:22 +02001888 continue;
1889
S.Çağlar Onurab466232008-02-14 17:36:47 +02001890 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001891 __skb_queue_purge(&entry->skb_list);
1892 continue;
1893 }
1894 return entry;
1895 }
1896
1897 return NULL;
1898}
1899
Johannes Berg49461622008-06-30 15:10:45 +02001900static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001901ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001902{
1903 struct ieee80211_hdr *hdr;
1904 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001905 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001906 unsigned int frag, seq;
1907 struct ieee80211_fragment_entry *entry;
1908 struct sk_buff *skb;
Johannes Berg554891e2010-09-24 12:38:25 +02001909 struct ieee80211_rx_status *status;
Johannes Berg571ecf62007-07-27 15:43:22 +02001910
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001911 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001912 fc = hdr->frame_control;
Javier Cardonaf7fbf702012-10-25 11:10:18 -07001913
1914 if (ieee80211_is_ctl(fc))
1915 return RX_CONTINUE;
1916
Johannes Berg571ecf62007-07-27 15:43:22 +02001917 sc = le16_to_cpu(hdr->seq_ctrl);
1918 frag = sc & IEEE80211_SCTL_FRAG;
1919
Johannes Bergb8fff402014-11-03 13:57:46 +01001920 if (is_multicast_ether_addr(hdr->addr1)) {
Johannes Bergc206ca62015-04-22 20:47:28 +02001921 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
Andreas Müllerd0259332014-12-12 12:11:11 +01001922 goto out_no_led;
Johannes Berg571ecf62007-07-27 15:43:22 +02001923 }
Johannes Bergb8fff402014-11-03 13:57:46 +01001924
Andreas Müllerd0259332014-12-12 12:11:11 +01001925 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1926 goto out;
1927
Johannes Berg571ecf62007-07-27 15:43:22 +02001928 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1929
Zhu Yie3cf8b32010-03-29 17:35:07 +08001930 if (skb_linearize(rx->skb))
1931 return RX_DROP_UNUSABLE;
1932
Abhijeet Kolekar058897a2010-05-11 11:22:11 -07001933 /*
1934 * skb_linearize() might change the skb->data and
1935 * previously cached variables (in this case, hdr) need to
1936 * be refreshed with the new data.
1937 */
1938 hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001939 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1940
1941 if (frag == 0) {
1942 /* This is the first fragment of a new frame. */
1943 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg9e262972011-07-07 18:45:03 +02001944 rx->seqno_idx, &(rx->skb));
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +02001945 if (rx->key &&
1946 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
Johannes Berg9acc54b2016-02-26 22:13:40 +01001947 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
1948 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
1949 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
Harvey Harrison358c8d92008-07-15 18:44:13 -07001950 ieee80211_has_protected(fc)) {
Johannes Berg9e262972011-07-07 18:45:03 +02001951 int queue = rx->security_idx;
Johannes Berg9acc54b2016-02-26 22:13:40 +01001952
1953 /* Store CCMP/GCMP PN so that we can verify that the
1954 * next fragment has a sequential PN value.
1955 */
1956 entry->check_sequential_pn = true;
Johannes Berg571ecf62007-07-27 15:43:22 +02001957 memcpy(entry->last_pn,
Jouni Malinen91902522010-06-11 10:27:33 -07001958 rx->key->u.ccmp.rx_pn[queue],
Johannes Berg4325f6c2013-05-08 13:09:08 +02001959 IEEE80211_CCMP_PN_LEN);
Johannes Berg9acc54b2016-02-26 22:13:40 +01001960 BUILD_BUG_ON(offsetof(struct ieee80211_key,
1961 u.ccmp.rx_pn) !=
1962 offsetof(struct ieee80211_key,
1963 u.gcmp.rx_pn));
1964 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
1965 sizeof(rx->key->u.gcmp.rx_pn[queue]));
1966 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
1967 IEEE80211_GCMP_PN_LEN);
Johannes Berg571ecf62007-07-27 15:43:22 +02001968 }
Johannes Berg9ae54c82008-01-31 19:48:20 +01001969 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001970 }
1971
1972 /* This is a fragment for a frame that should already be pending in
1973 * fragment cache. Add this fragment to the end of the pending entry.
1974 */
Johannes Berg9e262972011-07-07 18:45:03 +02001975 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1976 rx->seqno_idx, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001977 if (!entry) {
1978 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001979 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001980 }
1981
Johannes Berg9acc54b2016-02-26 22:13:40 +01001982 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
1983 * MPDU PN values are not incrementing in steps of 1."
1984 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
1985 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
1986 */
1987 if (entry->check_sequential_pn) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001988 int i;
Johannes Berg4325f6c2013-05-08 13:09:08 +02001989 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
Jouni Malinen91902522010-06-11 10:27:33 -07001990 int queue;
Johannes Berg9acc54b2016-02-26 22:13:40 +01001991
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))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001997 return RX_DROP_UNUSABLE;
Johannes Berg4325f6c2013-05-08 13:09:08 +02001998 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1999 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
Johannes Berg571ecf62007-07-27 15:43:22 +02002000 pn[i]++;
2001 if (pn[i])
2002 break;
2003 }
Johannes Berg9e262972011-07-07 18:45:03 +02002004 queue = rx->security_idx;
Jouni Malinen91902522010-06-11 10:27:33 -07002005 rpn = rx->key->u.ccmp.rx_pn[queue];
Johannes Berg4325f6c2013-05-08 13:09:08 +02002006 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002007 return RX_DROP_UNUSABLE;
Johannes Berg4325f6c2013-05-08 13:09:08 +02002008 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
Johannes Berg571ecf62007-07-27 15:43:22 +02002009 }
2010
Harvey Harrison358c8d92008-07-15 18:44:13 -07002011 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +02002012 __skb_queue_tail(&entry->skb_list, rx->skb);
2013 entry->last_frag = frag;
2014 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -07002015 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02002016 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +01002017 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002018 }
2019
2020 rx->skb = __skb_dequeue(&entry->skb_list);
2021 if (skb_tailroom(rx->skb) < entry->extra_len) {
Johannes Bergf1160432015-04-22 20:25:20 +02002022 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
Johannes Berg571ecf62007-07-27 15:43:22 +02002023 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2024 GFP_ATOMIC))) {
2025 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2026 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +01002027 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02002028 }
2029 }
2030 while ((skb = __skb_dequeue(&entry->skb_list))) {
2031 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
2032 dev_kfree_skb(skb);
2033 }
2034
2035 /* Complete frame has been reassembled - process it now */
Johannes Berg554891e2010-09-24 12:38:25 +02002036 status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002037
2038 out:
Andreas Müllerd0259332014-12-12 12:11:11 +01002039 ieee80211_led_rx(rx->local);
2040 out_no_led:
Johannes Berg571ecf62007-07-27 15:43:22 +02002041 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02002042 rx->sta->rx_stats.packets++;
Johannes Berg9ae54c82008-01-31 19:48:20 +01002043 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02002044}
2045
Johannes Berg1df332e2012-10-26 00:09:11 +02002046static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02002047{
Johannes Berg1df332e2012-10-26 00:09:11 +02002048 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002049 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02002050
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002051 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02002052}
2053
Johannes Berg1df332e2012-10-26 00:09:11 +02002054static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02002055{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002056 struct sk_buff *skb = rx->skb;
2057 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2058
Johannes Berg3017b802007-08-28 17:01:53 -04002059 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04002060 * Pass through unencrypted frames if the hardware has
2061 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04002062 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002063 if (status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002064 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02002065
2066 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07002067 if (unlikely(!ieee80211_has_protected(fc) &&
2068 !ieee80211_is_nullfunc(fc) &&
Johannes Berge8f4fb72015-03-20 11:37:36 +01002069 ieee80211_is_data(fc) && rx->key))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02002070 return -EACCES;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01002071
2072 return 0;
2073}
2074
Johannes Berg1df332e2012-10-26 00:09:11 +02002075static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
Johannes Bergbef5d1c2010-02-16 11:05:00 +01002076{
2077 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Jouni Malinene3efca02010-03-28 22:31:15 -07002078 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergbef5d1c2010-02-16 11:05:00 +01002079 __le16 fc = hdr->frame_control;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01002080
Jouni Malinene3efca02010-03-28 22:31:15 -07002081 /*
2082 * Pass through unencrypted frames if the hardware has
2083 * decrypted them already.
2084 */
2085 if (status->flag & RX_FLAG_DECRYPTED)
2086 return 0;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01002087
Johannes Bergc2c98fd2011-09-29 16:04:36 +02002088 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
Jouni Malinend211e902010-03-28 22:29:52 -07002089 if (unlikely(!ieee80211_has_protected(fc) &&
2090 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02002091 rx->key)) {
Johannes Berg6ff57cf2013-05-16 00:55:00 +02002092 if (ieee80211_is_deauth(fc) ||
2093 ieee80211_is_disassoc(fc))
2094 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2095 rx->skb->data,
2096 rx->skb->len);
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03002097 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02002098 }
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03002099 /* BIP does not use Protected field, so need to check MMIE */
Joe Perchesf64f9e72009-11-29 16:55:45 -08002100 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02002101 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
Johannes Berg6ff57cf2013-05-16 00:55:00 +02002102 if (ieee80211_is_deauth(fc) ||
2103 ieee80211_is_disassoc(fc))
2104 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2105 rx->skb->data,
2106 rx->skb->len);
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03002107 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02002108 }
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03002109 /*
2110 * When using MFP, Action frames are not allowed prior to
2111 * having configured keys.
2112 */
2113 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
Johannes Bergd8ca16d2014-01-23 16:20:29 +01002114 ieee80211_is_robust_mgmt_frame(rx->skb)))
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03002115 return -EACCES;
2116 }
Johannes Bergb3fc9c62008-04-13 10:12:47 +02002117
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002118 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02002119}
2120
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002121static int
Felix Fietkau4114fa22011-04-12 19:15:22 +02002122__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
Johannes Berg571ecf62007-07-27 15:43:22 +02002123{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002124 struct ieee80211_sub_if_data *sdata = rx->sdata;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002125 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002126 bool check_port_control = false;
2127 struct ethhdr *ehdr;
2128 int ret;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002129
Felix Fietkau4114fa22011-04-12 19:15:22 +02002130 *port_control = false;
Johannes Berg9bc383d2009-11-19 11:55:19 +01002131 if (ieee80211_has_a4(hdr->frame_control) &&
2132 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002133 return -1;
Johannes Berg9bc383d2009-11-19 11:55:19 +01002134
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002135 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2136 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2137
2138 if (!sdata->u.mgd.use_4addr)
2139 return -1;
2140 else
2141 check_port_control = true;
2142 }
2143
Johannes Berg9bc383d2009-11-19 11:55:19 +01002144 if (is_multicast_ether_addr(hdr->addr1) &&
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002145 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002146 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02002147
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002148 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
Felix Fietkau4114fa22011-04-12 19:15:22 +02002149 if (ret < 0)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002150 return ret;
2151
2152 ehdr = (struct ethhdr *) rx->skb->data;
Felix Fietkau4114fa22011-04-12 19:15:22 +02002153 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2154 *port_control = true;
2155 else if (check_port_control)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002156 return -1;
2157
2158 return 0;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002159}
Johannes Berg571ecf62007-07-27 15:43:22 +02002160
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002161/*
2162 * requires that rx->skb is a frame with ethernet header
2163 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07002164static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002165{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05302166 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002167 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2168 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2169
2170 /*
2171 * Allow EAPOL frames to us/the PAE group address regardless
2172 * of whether the frame was encrypted or not.
2173 */
Johannes Berga621fa42010-08-27 14:26:54 +03002174 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
Joe Perches3bc79452012-05-08 18:56:53 +00002175 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2176 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002177 return true;
2178
2179 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07002180 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002181 return false;
2182
2183 return true;
2184}
2185
2186/*
2187 * requires that rx->skb is a frame with ethernet header
2188 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002189static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01002190ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002191{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002192 struct ieee80211_sub_if_data *sdata = rx->sdata;
2193 struct net_device *dev = sdata->dev;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002194 struct sk_buff *skb, *xmit_skb;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002195 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2196 struct sta_info *dsta;
Johannes Berg571ecf62007-07-27 15:43:22 +02002197
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002198 skb = rx->skb;
2199 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02002200
Johannes Berg5a490512015-04-22 17:10:38 +02002201 ieee80211_rx_stats(dev, skb->len);
2202
Johannes Bergde8f18d2016-03-31 20:02:03 +03002203 if (rx->sta) {
2204 /* The seqno index has the same property as needed
2205 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2206 * for non-QoS-data frames. Here we know it's a data
2207 * frame, so count MSDUs.
2208 */
Johannes Berg0f9c5a62016-03-31 20:02:09 +03002209 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
Johannes Bergde8f18d2016-03-31 20:02:03 +03002210 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
Johannes Berg0f9c5a62016-03-31 20:02:09 +03002211 u64_stats_update_end(&rx->sta->rx_stats.syncp);
Johannes Bergde8f18d2016-03-31 20:02:03 +03002212 }
2213
Johannes Berg05c914f2008-09-11 00:01:58 +02002214 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2215 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02002216 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg9bc383d2009-11-19 11:55:19 +01002217 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002218 if (is_multicast_ether_addr(ehdr->h_dest)) {
2219 /*
2220 * send multicast frames both to higher layers in
2221 * local net stack and back to the wireless medium
2222 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002223 xmit_skb = skb_copy(skb, GFP_ATOMIC);
Joe Perchese87cc472012-05-13 21:56:26 +00002224 if (!xmit_skb)
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02002225 net_info_ratelimited("%s: failed to clone multicast frame\n",
Joe Perchese87cc472012-05-13 21:56:26 +00002226 dev->name);
Johannes Berg571ecf62007-07-27 15:43:22 +02002227 } else {
Johannes Bergabe60632009-11-25 17:46:18 +01002228 dsta = sta_info_get(sdata, skb->data);
2229 if (dsta) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002230 /*
2231 * The destination station is associated to
2232 * this AP (in this VLAN), so send the frame
2233 * directly to it and do not pass it to local
2234 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02002235 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002236 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02002237 skb = NULL;
2238 }
Johannes Berg571ecf62007-07-27 15:43:22 +02002239 }
2240 }
2241
Kalle Valo59d9cb02009-12-17 13:54:57 +01002242#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
Johannes Berg9e890a1f2013-12-04 09:16:31 +01002243 if (skb) {
2244 /* 'align' will only take the values 0 or 2 here since all
2245 * frames are required to be aligned to 2-byte boundaries
2246 * when being passed to mac80211; the code here works just
2247 * as well if that isn't true, but mac80211 assumes it can
2248 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
Johannes Bergd1c3a372009-01-07 00:26:10 +01002249 */
Johannes Berg9e890a1f2013-12-04 09:16:31 +01002250 int align;
2251
2252 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01002253 if (align) {
2254 if (WARN_ON(skb_headroom(skb) < 3)) {
2255 dev_kfree_skb(skb);
2256 skb = NULL;
2257 } else {
2258 u8 *data = skb->data;
Zhu Yi8ce0b582009-10-28 13:13:52 -07002259 size_t len = skb_headlen(skb);
2260 skb->data -= align;
2261 memmove(skb->data, data, len);
2262 skb_set_tail_pointer(skb, len);
Johannes Bergd1c3a372009-01-07 00:26:10 +01002263 }
2264 }
Johannes Berg9e890a1f2013-12-04 09:16:31 +01002265 }
Johannes Bergd1c3a372009-01-07 00:26:10 +01002266#endif
2267
Johannes Berg9e890a1f2013-12-04 09:16:31 +01002268 if (skb) {
2269 /* deliver to local stack */
2270 skb->protocol = eth_type_trans(skb, dev);
2271 memset(skb->cb, 0, sizeof(skb->cb));
Johannes Bergaf9f9b22015-06-11 16:02:32 +02002272 if (rx->napi)
2273 napi_gro_receive(rx->napi, skb);
Johannes Berg06d181a2014-02-04 20:51:09 +01002274 else
2275 netif_receive_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002276 }
2277
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002278 if (xmit_skb) {
Helmut Schaaaef6c922011-12-21 09:11:35 +01002279 /*
2280 * Send to wireless media and increase priority by 256 to
2281 * keep the received priority instead of reclassifying
2282 * the frame (see cfg80211_classify8021d).
2283 */
2284 xmit_skb->priority += 256;
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09002285 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002286 skb_reset_network_header(xmit_skb);
2287 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002288 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002289 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002290}
2291
Johannes Berg49461622008-06-30 15:10:45 +02002292static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002293ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002294{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002295 struct net_device *dev = rx->sdata->dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08002296 struct sk_buff *skb = rx->skb;
Harvey Harrison358c8d92008-07-15 18:44:13 -07002297 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2298 __le16 fc = hdr->frame_control;
Zhu Yieaf85ca2009-12-01 10:18:37 +08002299 struct sk_buff_head frame_list;
Johannes Berg554891e2010-09-24 12:38:25 +02002300 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg7f6990c2016-10-05 15:29:49 +02002301 struct ethhdr ethhdr;
Johannes Berge2b52272016-10-05 16:42:06 +02002302 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002303
Harvey Harrison358c8d92008-07-15 18:44:13 -07002304 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002305 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002306
Harvey Harrison358c8d92008-07-15 18:44:13 -07002307 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002308 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002309
Johannes Berg554891e2010-09-24 12:38:25 +02002310 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002311 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002312
Johannes Bergea720932016-10-05 10:14:42 +02002313 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2314 switch (rx->sdata->vif.type) {
2315 case NL80211_IFTYPE_AP_VLAN:
2316 if (!rx->sdata->u.vlan.sta)
2317 return RX_DROP_UNUSABLE;
2318 break;
2319 case NL80211_IFTYPE_STATION:
2320 if (!rx->sdata->u.mgd.use_4addr)
2321 return RX_DROP_UNUSABLE;
2322 break;
2323 default:
2324 return RX_DROP_UNUSABLE;
2325 }
Johannes Berge2b52272016-10-05 16:42:06 +02002326 check_da = NULL;
2327 check_sa = NULL;
2328 } else switch (rx->sdata->vif.type) {
2329 case NL80211_IFTYPE_AP:
2330 case NL80211_IFTYPE_AP_VLAN:
2331 check_da = NULL;
2332 break;
2333 case NL80211_IFTYPE_STATION:
2334 if (!rx->sta ||
2335 !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2336 check_sa = NULL;
2337 break;
2338 case NL80211_IFTYPE_MESH_POINT:
2339 check_sa = NULL;
2340 break;
2341 default:
2342 break;
Johannes Bergea720932016-10-05 10:14:42 +02002343 }
Zhu Yieaf85ca2009-12-01 10:18:37 +08002344
Johannes Bergea720932016-10-05 10:14:42 +02002345 if (is_multicast_ether_addr(hdr->addr1))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002346 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002347
2348 skb->dev = dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08002349 __skb_queue_head_init(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002350
Johannes Berg7f6990c2016-10-05 15:29:49 +02002351 if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2352 rx->sdata->vif.addr,
2353 rx->sdata->vif.type))
2354 return RX_DROP_UNUSABLE;
2355
Zhu Yieaf85ca2009-12-01 10:18:37 +08002356 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2357 rx->sdata->vif.type,
Johannes Berg8b935ee2016-10-05 16:17:01 +02002358 rx->local->hw.extra_tx_headroom,
Johannes Berge2b52272016-10-05 16:42:06 +02002359 check_da, check_sa);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002360
Zhu Yieaf85ca2009-12-01 10:18:37 +08002361 while (!skb_queue_empty(&frame_list)) {
2362 rx->skb = __skb_dequeue(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002363
Harvey Harrison358c8d92008-07-15 18:44:13 -07002364 if (!ieee80211_frame_allowed(rx, fc)) {
Zhu Yieaf85ca2009-12-01 10:18:37 +08002365 dev_kfree_skb(rx->skb);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002366 continue;
2367 }
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002368
2369 ieee80211_deliver_skb(rx);
2370 }
2371
Johannes Berg9ae54c82008-01-31 19:48:20 +01002372 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002373}
2374
Ingo Molnarbf94e172008-10-12 23:51:38 -07002375#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02002376static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002377ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2378{
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002379 struct ieee80211_hdr *fwd_hdr, *hdr;
2380 struct ieee80211_tx_info *info;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002381 struct ieee80211s_hdr *mesh_hdr;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002382 struct sk_buff *skb = rx->skb, *fwd_skb;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002383 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002384 struct ieee80211_sub_if_data *sdata = rx->sdata;
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002385 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Michal Kaziorcf440122016-01-25 14:43:24 +01002386 u16 ac, q, hdrlen;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002387
2388 hdr = (struct ieee80211_hdr *) skb->data;
2389 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg9b395bc2012-10-26 00:36:40 +02002390
2391 /* make sure fixed part of mesh header is there, also checks skb len */
2392 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2393 return RX_DROP_MONITOR;
2394
2395 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2396
2397 /* make sure full mesh header is there, also checks skb len */
2398 if (!pskb_may_pull(rx->skb,
2399 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2400 return RX_DROP_MONITOR;
2401
2402 /* reload pointers */
2403 hdr = (struct ieee80211_hdr *) skb->data;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002404 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2405
Bob Copelandd0c22112015-03-02 14:28:52 -05002406 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2407 return RX_DROP_MONITOR;
2408
Thomas Pedersen2157fdd2011-09-01 12:32:14 -07002409 /* frame is in RMC, don't forward */
2410 if (ieee80211_is_data(hdr->frame_control) &&
2411 is_multicast_ether_addr(hdr->addr1) &&
Johannes Bergbf7cd942013-02-15 14:40:31 +01002412 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
Thomas Pedersen2157fdd2011-09-01 12:32:14 -07002413 return RX_DROP_MONITOR;
2414
Johannes Berg5c900672015-04-22 14:48:34 +02002415 if (!ieee80211_is_data(hdr->frame_control))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002416 return RX_CONTINUE;
2417
2418 if (!mesh_hdr->ttl)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002419 return RX_DROP_MONITOR;
2420
Javier Cardona43b7b312009-10-15 18:10:51 -07002421 if (mesh_hdr->flags & MESH_FLAGS_AE) {
YanBo79617de2008-09-22 13:30:32 +08002422 struct mesh_path *mppath;
Javier Cardona43b7b312009-10-15 18:10:51 -07002423 char *proxied_addr;
2424 char *mpp_addr;
2425
2426 if (is_multicast_ether_addr(hdr->addr1)) {
2427 mpp_addr = hdr->addr3;
2428 proxied_addr = mesh_hdr->eaddr1;
Johannes Berg9b395bc2012-10-26 00:36:40 +02002429 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2430 /* has_a4 already checked in ieee80211_rx_mesh_check */
Javier Cardona43b7b312009-10-15 18:10:51 -07002431 mpp_addr = hdr->addr4;
2432 proxied_addr = mesh_hdr->eaddr2;
Johannes Berg9b395bc2012-10-26 00:36:40 +02002433 } else {
2434 return RX_DROP_MONITOR;
Javier Cardona43b7b312009-10-15 18:10:51 -07002435 }
YanBo79617de2008-09-22 13:30:32 +08002436
YanBo79617de2008-09-22 13:30:32 +08002437 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +01002438 mppath = mpp_path_lookup(sdata, proxied_addr);
YanBo79617de2008-09-22 13:30:32 +08002439 if (!mppath) {
Johannes Bergbf7cd942013-02-15 14:40:31 +01002440 mpp_path_add(sdata, proxied_addr, mpp_addr);
YanBo79617de2008-09-22 13:30:32 +08002441 } else {
2442 spin_lock_bh(&mppath->state_lock);
Joe Perchesb203ca32012-05-08 18:56:52 +00002443 if (!ether_addr_equal(mppath->mpp, mpp_addr))
Javier Cardona43b7b312009-10-15 18:10:51 -07002444 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
Henning Roggeab1c7902016-02-03 13:58:37 +01002445 mppath->exp_time = jiffies;
YanBo79617de2008-09-22 13:30:32 +08002446 spin_unlock_bh(&mppath->state_lock);
2447 }
2448 rcu_read_unlock();
2449 }
2450
Javier Cardona3c5772a2009-08-10 12:15:48 -07002451 /* Frame has reached destination. Don't forward */
2452 if (!is_multicast_ether_addr(hdr->addr1) &&
Joe Perchesb203ca32012-05-08 18:56:52 +00002453 ether_addr_equal(sdata->vif.addr, hdr->addr3))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002454 return RX_CONTINUE;
2455
Michal Kaziorcf440122016-01-25 14:43:24 +01002456 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2457 q = sdata->vif.hw_queue[ac];
Thomas Pedersend3c15972011-11-24 17:15:23 -08002458 if (ieee80211_queue_stopped(&local->hw, q)) {
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002459 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
Thomas Pedersend3c15972011-11-24 17:15:23 -08002460 return RX_DROP_MONITOR;
2461 }
2462 skb_set_queue_mapping(skb, q);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002463
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002464 if (!--mesh_hdr->ttl) {
2465 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
Javier Cardona2ac64cd2012-10-24 12:43:31 -07002466 goto out;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002467 }
2468
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +08002469 if (!ifmsh->mshcfg.dot11MeshForwarding)
2470 goto out;
2471
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002472 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2473 if (!fwd_skb) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02002474 net_info_ratelimited("%s: failed to clone mesh frame\n",
Joe Perchese87cc472012-05-13 21:56:26 +00002475 sdata->name);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002476 goto out;
2477 }
2478
2479 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
Thomas Pedersen9d6d6f42013-04-08 11:06:12 -07002480 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002481 info = IEEE80211_SKB_CB(fwd_skb);
2482 memset(info, 0, sizeof(*info));
2483 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2484 info->control.vif = &rx->sdata->vif;
2485 info->control.jiffies = jiffies;
2486 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2487 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2488 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
Marco Porsch3f52b7e2013-01-30 18:14:08 +01002489 /* update power mode indication when forwarding */
2490 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
Johannes Bergbf7cd942013-02-15 14:40:31 +01002491 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
Marco Porsch3f52b7e2013-01-30 18:14:08 +01002492 /* mesh power mode flags updated in mesh_nexthop_lookup */
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002493 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2494 } else {
2495 /* unable to resolve next hop */
Johannes Bergbf7cd942013-02-15 14:40:31 +01002496 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +08002497 fwd_hdr->addr3, 0,
2498 WLAN_REASON_MESH_PATH_NOFORWARD,
2499 fwd_hdr->addr2);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002500 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
Jesper Juhl74b8cc32012-01-14 21:52:17 +01002501 kfree_skb(fwd_skb);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002502 return RX_DROP_MONITOR;
2503 }
2504
2505 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2506 ieee80211_add_pending_skb(local, fwd_skb);
Johannes Bergb51aff02010-12-22 10:15:07 +01002507 out:
Johannes Bergdf140462015-04-22 14:40:58 +02002508 if (is_multicast_ether_addr(hdr->addr1))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002509 return RX_CONTINUE;
Johannes Bergdf140462015-04-22 14:40:58 +02002510 return RX_DROP_MONITOR;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002511}
Ingo Molnarbf94e172008-10-12 23:51:38 -07002512#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002513
2514static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002515ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002516{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002517 struct ieee80211_sub_if_data *sdata = rx->sdata;
Vivek Natarajane15276a2010-02-08 17:47:01 +05302518 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002519 struct net_device *dev = sdata->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07002520 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2521 __le16 fc = hdr->frame_control;
Felix Fietkau4114fa22011-04-12 19:15:22 +02002522 bool port_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002523 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002524
Harvey Harrison358c8d92008-07-15 18:44:13 -07002525 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002526 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002527
Harvey Harrison358c8d92008-07-15 18:44:13 -07002528 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002529 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002530
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002531 /*
Johannes Berge7f4a942011-11-04 11:18:20 +01002532 * Send unexpected-4addr-frame event to hostapd. For older versions,
2533 * also drop the frame to cooked monitor interfaces.
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002534 */
2535 if (ieee80211_has_a4(hdr->frame_control) &&
Johannes Berge7f4a942011-11-04 11:18:20 +01002536 sdata->vif.type == NL80211_IFTYPE_AP) {
2537 if (rx->sta &&
2538 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2539 cfg80211_rx_unexpected_4addr_frame(
2540 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002541 return RX_DROP_MONITOR;
Johannes Berge7f4a942011-11-04 11:18:20 +01002542 }
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002543
Felix Fietkau4114fa22011-04-12 19:15:22 +02002544 err = __ieee80211_data_to_8023(rx, &port_control);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002545 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002546 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002547
Harvey Harrison358c8d92008-07-15 18:44:13 -07002548 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002549 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002550
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02002551 /* directly handle TDLS channel switch requests/responses */
2552 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2553 cpu_to_be16(ETH_P_TDLS))) {
2554 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2555
2556 if (pskb_may_pull(rx->skb,
2557 offsetof(struct ieee80211_tdls_data, u)) &&
2558 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2559 tf->category == WLAN_CATEGORY_TDLS &&
2560 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2561 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
Arik Nemtsovc8ff71e2015-07-08 15:41:45 +03002562 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2563 schedule_work(&local->tdls_chsw_work);
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02002564 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02002565 rx->sta->rx_stats.packets++;
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02002566
2567 return RX_QUEUED;
2568 }
2569 }
2570
Felix Fietkau4114fa22011-04-12 19:15:22 +02002571 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2572 unlikely(port_control) && sdata->bss) {
2573 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2574 u.ap);
2575 dev = sdata->dev;
2576 rx->sdata = sdata;
2577 }
2578
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002579 rx->skb->dev = dev;
2580
Johannes Berg602fae42016-03-17 15:02:52 +02002581 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2582 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
Rajkumar Manoharan8c99f692011-02-02 22:57:53 +05302583 !is_multicast_ether_addr(
2584 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2585 (!local->scanning &&
Johannes Berg602fae42016-03-17 15:02:52 +02002586 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2587 mod_timer(&local->dynamic_ps_timer, jiffies +
2588 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
Vivek Natarajane15276a2010-02-08 17:47:01 +05302589
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002590 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02002591
Johannes Berg9ae54c82008-01-31 19:48:20 +01002592 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002593}
2594
Johannes Berg49461622008-06-30 15:10:45 +02002595static ieee80211_rx_result debug_noinline
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002596ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
Ron Rindjunsky71364712007-12-25 17:00:36 +02002597{
Ron Rindjunsky71364712007-12-25 17:00:36 +02002598 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002599 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002600 struct tid_ampdu_rx *tid_agg_rx;
2601 u16 start_seq_num;
2602 u16 tid;
2603
Harvey Harrisona7767f92008-07-02 16:30:51 -07002604 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002605 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002606
Harvey Harrisona7767f92008-07-02 16:30:51 -07002607 if (ieee80211_is_back_req(bar->frame_control)) {
Johannes Berg8ae59772010-05-30 14:52:58 +02002608 struct {
2609 __le16 control, start_seq_num;
2610 } __packed bar_data;
Emmanuel Grumbach63822462015-04-20 22:53:37 +03002611 struct ieee80211_event event = {
2612 .type = BAR_RX_EVENT,
2613 };
Johannes Berg8ae59772010-05-30 14:52:58 +02002614
Ron Rindjunsky71364712007-12-25 17:00:36 +02002615 if (!rx->sta)
Johannes Berga02ae752009-11-16 12:00:40 +01002616 return RX_DROP_MONITOR;
Johannes Berg8ae59772010-05-30 14:52:58 +02002617
2618 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2619 &bar_data, sizeof(bar_data)))
2620 return RX_DROP_MONITOR;
2621
Johannes Berg8ae59772010-05-30 14:52:58 +02002622 tid = le16_to_cpu(bar_data.control) >> 12;
Johannes Berga87f7362010-06-10 10:21:38 +02002623
Johannes Berg53f24972016-08-29 23:25:19 +03002624 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2625 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2626 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2627 WLAN_BACK_RECIPIENT,
2628 WLAN_REASON_QSTA_REQUIRE_SETUP);
2629
Johannes Berga87f7362010-06-10 10:21:38 +02002630 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2631 if (!tid_agg_rx)
Johannes Berga02ae752009-11-16 12:00:40 +01002632 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002633
Johannes Berg8ae59772010-05-30 14:52:58 +02002634 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
Emmanuel Grumbach63822462015-04-20 22:53:37 +03002635 event.u.ba.tid = tid;
2636 event.u.ba.ssn = start_seq_num;
2637 event.u.ba.sta = &rx->sta->sta;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002638
2639 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01002640 if (tid_agg_rx->timeout)
2641 mod_timer(&tid_agg_rx->session_timer,
2642 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02002643
Johannes Bergdd318572010-11-29 11:09:16 +01002644 spin_lock(&tid_agg_rx->reorder_lock);
Johannes Berga02ae752009-11-16 12:00:40 +01002645 /* release stored frames up to start of BAR */
Johannes Bergd3b2fb52012-06-22 12:48:38 +02002646 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002647 start_seq_num, frames);
Johannes Bergdd318572010-11-29 11:09:16 +01002648 spin_unlock(&tid_agg_rx->reorder_lock);
2649
Emmanuel Grumbach63822462015-04-20 22:53:37 +03002650 drv_event_callback(rx->local, rx->sdata, &event);
2651
Johannes Berga02ae752009-11-16 12:00:40 +01002652 kfree_skb(skb);
2653 return RX_QUEUED;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002654 }
2655
Johannes Berg08daeca2010-05-30 14:53:43 +02002656 /*
2657 * After this point, we only want management frames,
2658 * so we can drop all remaining control frames to
2659 * cooked monitor interfaces.
2660 */
2661 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002662}
2663
Jouni Malinenf4f727a2009-01-10 11:46:53 +02002664static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2665 struct ieee80211_mgmt *mgmt,
2666 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02002667{
2668 struct ieee80211_local *local = sdata->local;
2669 struct sk_buff *skb;
2670 struct ieee80211_mgmt *resp;
2671
Joe Perchesb203ca32012-05-08 18:56:52 +00002672 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
Jouni Malinenfea14732009-01-08 13:32:06 +02002673 /* Not to own unicast address */
2674 return;
2675 }
2676
Joe Perchesb203ca32012-05-08 18:56:52 +00002677 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2678 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
Johannes Berg77fdaa12009-07-07 03:45:17 +02002679 /* Not from the current AP or not associated yet. */
Jouni Malinenfea14732009-01-08 13:32:06 +02002680 return;
2681 }
2682
2683 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2684 /* Too short SA Query request frame */
2685 return;
2686 }
2687
2688 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2689 if (skb == NULL)
2690 return;
2691
2692 skb_reserve(skb, local->hw.extra_tx_headroom);
2693 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2694 memset(resp, 0, 24);
2695 memcpy(resp->da, mgmt->sa, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01002696 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01002697 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02002698 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2699 IEEE80211_STYPE_ACTION);
2700 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2701 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2702 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2703 memcpy(resp->u.action.u.sa_query.trans_id,
2704 mgmt->u.action.u.sa_query.trans_id,
2705 WLAN_SA_QUERY_TR_ID_LEN);
2706
Johannes Berg62ae67b2009-11-18 18:42:05 +01002707 ieee80211_tx_skb(sdata, skb);
Jouni Malinenfea14732009-01-08 13:32:06 +02002708}
2709
Johannes Berg49461622008-06-30 15:10:45 +02002710static ieee80211_rx_result debug_noinline
Johannes Berg2e161f72010-08-12 15:38:38 +02002711ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2712{
2713 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002714 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002715
2716 /*
2717 * From here on, look only at management frames.
2718 * Data and control frames are already handled,
2719 * and unknown (reserved) frames are useless.
2720 */
2721 if (rx->skb->len < 24)
2722 return RX_DROP_MONITOR;
2723
2724 if (!ieee80211_is_mgmt(mgmt->frame_control))
2725 return RX_DROP_MONITOR;
2726
Johannes Bergee971922011-11-04 11:18:18 +01002727 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2728 ieee80211_is_beacon(mgmt->frame_control) &&
2729 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
Johannes Berg804483e2012-03-05 22:18:41 +01002730 int sig = 0;
2731
Johannes Berg30686bf2015-06-02 21:39:54 +02002732 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
Johannes Berg804483e2012-03-05 22:18:41 +01002733 sig = status->signal;
2734
Johannes Bergee971922011-11-04 11:18:18 +01002735 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2736 rx->skb->data, rx->skb->len,
Ben Greear37c73b52012-10-26 14:49:25 -07002737 status->freq, sig);
Johannes Bergee971922011-11-04 11:18:18 +01002738 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2739 }
2740
Johannes Berg2e161f72010-08-12 15:38:38 +02002741 if (ieee80211_drop_unencrypted_mgmt(rx))
2742 return RX_DROP_UNUSABLE;
2743
2744 return RX_CONTINUE;
2745}
2746
2747static ieee80211_rx_result debug_noinline
Johannes Bergde1ede72008-09-09 14:42:50 +02002748ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2749{
2750 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002751 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergde1ede72008-09-09 14:42:50 +02002752 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002753 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergde1ede72008-09-09 14:42:50 +02002754 int len = rx->skb->len;
2755
2756 if (!ieee80211_is_action(mgmt->frame_control))
2757 return RX_CONTINUE;
2758
Jouni Malinen026331c2010-02-15 12:53:10 +02002759 /* drop too small frames */
2760 if (len < IEEE80211_MIN_ACTION_SIZE)
2761 return RX_DROP_UNUSABLE;
2762
Marco Porsch815b8092012-12-05 15:04:26 -08002763 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002764 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2765 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
Johannes Berg84040802010-02-15 12:46:39 +02002766 return RX_DROP_UNUSABLE;
Johannes Bergde1ede72008-09-09 14:42:50 +02002767
Johannes Bergde1ede72008-09-09 14:42:50 +02002768 switch (mgmt->u.action.category) {
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002769 case WLAN_CATEGORY_HT:
2770 /* reject HT action frames from stations not supporting HT */
2771 if (!rx->sta->sta.ht_cap.ht_supported)
2772 goto invalid;
2773
2774 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2775 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2776 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2777 sdata->vif.type != NL80211_IFTYPE_AP &&
2778 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2779 break;
2780
Johannes Bergec61cd62012-12-28 12:12:10 +01002781 /* verify action & smps_control/chanwidth are present */
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002782 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2783 goto invalid;
2784
2785 switch (mgmt->u.action.u.ht_smps.action) {
2786 case WLAN_HT_ACTION_SMPS: {
2787 struct ieee80211_supported_band *sband;
Johannes Bergaf0ed692013-02-12 14:21:00 +01002788 enum ieee80211_smps_mode smps_mode;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002789
2790 /* convert to HT capability */
2791 switch (mgmt->u.action.u.ht_smps.smps_control) {
2792 case WLAN_HT_SMPS_CONTROL_DISABLED:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002793 smps_mode = IEEE80211_SMPS_OFF;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002794 break;
2795 case WLAN_HT_SMPS_CONTROL_STATIC:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002796 smps_mode = IEEE80211_SMPS_STATIC;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002797 break;
2798 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002799 smps_mode = IEEE80211_SMPS_DYNAMIC;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002800 break;
2801 default:
2802 goto invalid;
2803 }
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002804
2805 /* if no change do nothing */
Johannes Bergaf0ed692013-02-12 14:21:00 +01002806 if (rx->sta->sta.smps_mode == smps_mode)
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002807 goto handled;
Johannes Bergaf0ed692013-02-12 14:21:00 +01002808 rx->sta->sta.smps_mode = smps_mode;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002809
2810 sband = rx->local->hw.wiphy->bands[status->band];
2811
Johannes Berg64f68e52012-03-28 10:58:37 +02002812 rate_control_rate_update(local, sband, rx->sta,
2813 IEEE80211_RC_SMPS_CHANGED);
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002814 goto handled;
2815 }
Johannes Bergec61cd62012-12-28 12:12:10 +01002816 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2817 struct ieee80211_supported_band *sband;
2818 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
Eliad Peller1c45c5c2014-12-14 11:05:51 +02002819 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
Johannes Bergec61cd62012-12-28 12:12:10 +01002820
2821 /* If it doesn't support 40 MHz it can't change ... */
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002822 if (!(rx->sta->sta.ht_cap.cap &
2823 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
Johannes Bergec61cd62012-12-28 12:12:10 +01002824 goto handled;
2825
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002826 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
Eliad Peller1c45c5c2014-12-14 11:05:51 +02002827 max_bw = IEEE80211_STA_RX_BW_20;
Johannes Bergec61cd62012-12-28 12:12:10 +01002828 else
Eliad Peller1c45c5c2014-12-14 11:05:51 +02002829 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2830
2831 /* set cur_max_bandwidth and recalc sta bw */
2832 rx->sta->cur_max_bandwidth = max_bw;
2833 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002834
2835 if (rx->sta->sta.bandwidth == new_bw)
2836 goto handled;
Johannes Bergec61cd62012-12-28 12:12:10 +01002837
Eliad Peller1c45c5c2014-12-14 11:05:51 +02002838 rx->sta->sta.bandwidth = new_bw;
Johannes Bergec61cd62012-12-28 12:12:10 +01002839 sband = rx->local->hw.wiphy->bands[status->band];
2840
2841 rate_control_rate_update(local, sband, rx->sta,
2842 IEEE80211_RC_BW_CHANGED);
2843 goto handled;
2844 }
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002845 default:
2846 goto invalid;
2847 }
2848
2849 break;
Johannes Berg1b3a2e42013-03-26 15:17:18 +01002850 case WLAN_CATEGORY_PUBLIC:
2851 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2852 goto invalid;
2853 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2854 break;
2855 if (!rx->sta)
2856 break;
2857 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2858 break;
2859 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2860 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2861 break;
2862 if (len < offsetof(struct ieee80211_mgmt,
2863 u.action.u.ext_chan_switch.variable))
2864 goto invalid;
2865 goto queue;
Johannes Berg0af83d32012-12-27 18:55:36 +01002866 case WLAN_CATEGORY_VHT:
2867 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2868 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2869 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2870 sdata->vif.type != NL80211_IFTYPE_AP &&
2871 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2872 break;
2873
2874 /* verify action code is present */
2875 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2876 goto invalid;
2877
2878 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2879 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2880 u8 opmode;
2881
2882 /* verify opmode is present */
2883 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2884 goto invalid;
2885
2886 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2887
2888 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
Eyal Shapiracf1e05c2015-12-08 16:04:36 +02002889 opmode, status->band);
Johannes Berg0af83d32012-12-27 18:55:36 +01002890 goto handled;
2891 }
Sara Sharon23a1f8d2015-12-08 16:04:31 +02002892 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2893 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2894 goto invalid;
2895 goto queue;
2896 }
Johannes Berg0af83d32012-12-27 18:55:36 +01002897 default:
2898 break;
2899 }
2900 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002901 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01002902 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
Thomas Pedersenae2772b2011-10-26 14:47:29 -07002903 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
Johannes Berg8abd3f92009-02-10 21:25:47 +01002904 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
Alexander Simon13c40c52011-11-30 16:56:34 +01002905 sdata->vif.type != NL80211_IFTYPE_AP &&
2906 sdata->vif.type != NL80211_IFTYPE_ADHOC)
Johannes Berg84040802010-02-15 12:46:39 +02002907 break;
Johannes Berg8abd3f92009-02-10 21:25:47 +01002908
Jouni Malinen026331c2010-02-15 12:53:10 +02002909 /* verify action_code is present */
2910 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2911 break;
2912
Johannes Bergde1ede72008-09-09 14:42:50 +02002913 switch (mgmt->u.action.u.addba_req.action_code) {
2914 case WLAN_ACTION_ADDBA_REQ:
2915 if (len < (IEEE80211_MIN_ACTION_SIZE +
2916 sizeof(mgmt->u.action.u.addba_req)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002917 goto invalid;
2918 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002919 case WLAN_ACTION_ADDBA_RESP:
2920 if (len < (IEEE80211_MIN_ACTION_SIZE +
2921 sizeof(mgmt->u.action.u.addba_resp)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002922 goto invalid;
2923 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002924 case WLAN_ACTION_DELBA:
2925 if (len < (IEEE80211_MIN_ACTION_SIZE +
2926 sizeof(mgmt->u.action.u.delba)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002927 goto invalid;
2928 break;
2929 default:
2930 goto invalid;
Johannes Bergde1ede72008-09-09 14:42:50 +02002931 }
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002932
Johannes Berg8b58ff82010-06-10 10:21:51 +02002933 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002934 case WLAN_CATEGORY_SPECTRUM_MGMT:
Jouni Malinen026331c2010-02-15 12:53:10 +02002935 /* verify action_code is present */
2936 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2937 break;
2938
Johannes Berg39192c02008-09-09 14:49:03 +02002939 switch (mgmt->u.action.u.measurement.action_code) {
2940 case WLAN_ACTION_SPCT_MSR_REQ:
Johannes Berg57fbcce2016-04-12 15:56:15 +02002941 if (status->band != NL80211_BAND_5GHZ)
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002942 break;
2943
Johannes Berg39192c02008-09-09 14:49:03 +02002944 if (len < (IEEE80211_MIN_ACTION_SIZE +
2945 sizeof(mgmt->u.action.u.measurement)))
Johannes Berg84040802010-02-15 12:46:39 +02002946 break;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002947
Johannes Bergcc32abd2009-05-15 11:52:31 +02002948 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002949 break;
Johannes Bergcc32abd2009-05-15 11:52:31 +02002950
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002951 ieee80211_process_measurement_req(sdata, mgmt, len);
2952 goto handled;
2953 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2954 u8 *bssid;
2955 if (len < (IEEE80211_MIN_ACTION_SIZE +
2956 sizeof(mgmt->u.action.u.chan_switch)))
2957 break;
2958
2959 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07002960 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2961 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002962 break;
2963
2964 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2965 bssid = sdata->u.mgd.bssid;
2966 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2967 bssid = sdata->u.ibss.bssid;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07002968 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2969 bssid = mgmt->sa;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002970 else
2971 break;
2972
2973 if (!ether_addr_equal(mgmt->bssid, bssid))
Johannes Berg84040802010-02-15 12:46:39 +02002974 break;
Sujithc481ec92009-01-06 09:28:37 +05302975
Johannes Berg8b58ff82010-06-10 10:21:51 +02002976 goto queue;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002977 }
Johannes Berg39192c02008-09-09 14:49:03 +02002978 }
2979 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002980 case WLAN_CATEGORY_SA_QUERY:
2981 if (len < (IEEE80211_MIN_ACTION_SIZE +
2982 sizeof(mgmt->u.action.u.sa_query)))
Johannes Berg84040802010-02-15 12:46:39 +02002983 break;
2984
Jouni Malinenfea14732009-01-08 13:32:06 +02002985 switch (mgmt->u.action.u.sa_query.action) {
2986 case WLAN_ACTION_SA_QUERY_REQUEST:
2987 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002988 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002989 ieee80211_process_sa_query_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002990 goto handled;
Jouni Malinenfea14732009-01-08 13:32:06 +02002991 }
2992 break;
Thomas Pedersen8db09852011-08-12 20:01:00 -07002993 case WLAN_CATEGORY_SELF_PROTECTED:
Johannes Berg9b395bc2012-10-26 00:36:40 +02002994 if (len < (IEEE80211_MIN_ACTION_SIZE +
2995 sizeof(mgmt->u.action.u.self_prot.action_code)))
2996 break;
2997
Thomas Pedersen8db09852011-08-12 20:01:00 -07002998 switch (mgmt->u.action.u.self_prot.action_code) {
2999 case WLAN_SP_MESH_PEERING_OPEN:
3000 case WLAN_SP_MESH_PEERING_CLOSE:
3001 case WLAN_SP_MESH_PEERING_CONFIRM:
3002 if (!ieee80211_vif_is_mesh(&sdata->vif))
3003 goto invalid;
Thomas Pedersena6dad6a2013-03-04 13:06:12 -08003004 if (sdata->u.mesh.user_mpm)
Thomas Pedersen8db09852011-08-12 20:01:00 -07003005 /* userspace handles this frame */
3006 break;
3007 goto queue;
3008 case WLAN_SP_MGK_INFORM:
3009 case WLAN_SP_MGK_ACK:
3010 if (!ieee80211_vif_is_mesh(&sdata->vif))
3011 goto invalid;
3012 break;
3013 }
3014 break;
Javier Cardonad3aaec8a2011-05-03 16:57:09 -07003015 case WLAN_CATEGORY_MESH_ACTION:
Johannes Berg9b395bc2012-10-26 00:36:40 +02003016 if (len < (IEEE80211_MIN_ACTION_SIZE +
3017 sizeof(mgmt->u.action.u.mesh_action.action_code)))
3018 break;
3019
Johannes Berg77a121c2010-06-10 10:21:34 +02003020 if (!ieee80211_vif_is_mesh(&sdata->vif))
3021 break;
Thomas Pedersen25d49e42011-08-11 19:35:15 -07003022 if (mesh_action_is_path_sel(mgmt) &&
Johannes Berg1df332e2012-10-26 00:09:11 +02003023 !mesh_path_sel_is_hwmp(sdata))
Javier Cardonac7108a72010-12-16 17:37:50 -08003024 break;
3025 goto queue;
Johannes Berg84040802010-02-15 12:46:39 +02003026 }
Jouni Malinen026331c2010-02-15 12:53:10 +02003027
Johannes Berg2e161f72010-08-12 15:38:38 +02003028 return RX_CONTINUE;
3029
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02003030 invalid:
Johannes Berg554891e2010-09-24 12:38:25 +02003031 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
Johannes Berg2e161f72010-08-12 15:38:38 +02003032 /* will return in the next handlers */
3033 return RX_CONTINUE;
3034
3035 handled:
3036 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02003037 rx->sta->rx_stats.packets++;
Johannes Berg2e161f72010-08-12 15:38:38 +02003038 dev_kfree_skb(rx->skb);
3039 return RX_QUEUED;
3040
3041 queue:
3042 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3043 skb_queue_tail(&sdata->skb_queue, rx->skb);
3044 ieee80211_queue_work(&local->hw, &sdata->work);
3045 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02003046 rx->sta->rx_stats.packets++;
Johannes Berg2e161f72010-08-12 15:38:38 +02003047 return RX_QUEUED;
3048}
3049
3050static ieee80211_rx_result debug_noinline
3051ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3052{
Johannes Berg554891e2010-09-24 12:38:25 +02003053 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg804483e2012-03-05 22:18:41 +01003054 int sig = 0;
Johannes Berg2e161f72010-08-12 15:38:38 +02003055
3056 /* skip known-bad action frames and return them in the next handler */
Johannes Berg554891e2010-09-24 12:38:25 +02003057 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
Johannes Berg2e161f72010-08-12 15:38:38 +02003058 return RX_CONTINUE;
Felix Fietkaud7907442010-01-07 20:23:53 +01003059
Jouni Malinen026331c2010-02-15 12:53:10 +02003060 /*
3061 * Getting here means the kernel doesn't know how to handle
3062 * it, but maybe userspace does ... include returned frames
3063 * so userspace can register for those to know whether ones
3064 * it transmitted were processed or returned.
3065 */
Jouni Malinen026331c2010-02-15 12:53:10 +02003066
Johannes Berg30686bf2015-06-02 21:39:54 +02003067 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
Johannes Berg804483e2012-03-05 22:18:41 +01003068 sig = status->signal;
3069
Johannes Berg71bbc992012-06-15 15:30:18 +02003070 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
Vladimir Kondratiev970fdfa2014-08-11 03:29:57 -07003071 rx->skb->data, rx->skb->len, 0)) {
Johannes Berg2e161f72010-08-12 15:38:38 +02003072 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02003073 rx->sta->rx_stats.packets++;
Johannes Berg2e161f72010-08-12 15:38:38 +02003074 dev_kfree_skb(rx->skb);
3075 return RX_QUEUED;
3076 }
3077
Johannes Berg2e161f72010-08-12 15:38:38 +02003078 return RX_CONTINUE;
3079}
3080
3081static ieee80211_rx_result debug_noinline
3082ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3083{
3084 struct ieee80211_local *local = rx->local;
3085 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3086 struct sk_buff *nskb;
3087 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02003088 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02003089
3090 if (!ieee80211_is_action(mgmt->frame_control))
3091 return RX_CONTINUE;
3092
3093 /*
3094 * For AP mode, hostapd is responsible for handling any action
3095 * frames that we didn't handle, including returning unknown
3096 * ones. For all other modes we will return them to the sender,
3097 * setting the 0x80 bit in the action category, as required by
Johannes Berg4b5ebcc2012-06-27 15:38:56 +02003098 * 802.11-2012 9.24.4.
Johannes Berg2e161f72010-08-12 15:38:38 +02003099 * Newer versions of hostapd shall also use the management frame
3100 * registration mechanisms, but older ones still use cooked
3101 * monitor interfaces so push all frames there.
3102 */
Johannes Berg554891e2010-09-24 12:38:25 +02003103 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
Johannes Berg2e161f72010-08-12 15:38:38 +02003104 (sdata->vif.type == NL80211_IFTYPE_AP ||
3105 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3106 return RX_DROP_MONITOR;
Jouni Malinen026331c2010-02-15 12:53:10 +02003107
Johannes Berg4b5ebcc2012-06-27 15:38:56 +02003108 if (is_multicast_ether_addr(mgmt->da))
3109 return RX_DROP_MONITOR;
3110
Johannes Berg84040802010-02-15 12:46:39 +02003111 /* do not return rejected action frames */
3112 if (mgmt->u.action.category & 0x80)
3113 return RX_DROP_UNUSABLE;
3114
3115 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3116 GFP_ATOMIC);
3117 if (nskb) {
John W. Linville292b4df2010-06-24 11:13:56 -04003118 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
Johannes Berg84040802010-02-15 12:46:39 +02003119
John W. Linville292b4df2010-06-24 11:13:56 -04003120 nmgmt->u.action.category |= 0x80;
3121 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3122 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
Johannes Berg84040802010-02-15 12:46:39 +02003123
3124 memset(nskb->cb, 0, sizeof(nskb->cb));
3125
Johannes Berg07e5a5f2013-03-07 13:22:05 +01003126 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3127 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3128
3129 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3130 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3131 IEEE80211_TX_CTL_NO_CCK_RATE;
Johannes Berg30686bf2015-06-02 21:39:54 +02003132 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
Johannes Berg07e5a5f2013-03-07 13:22:05 +01003133 info->hw_queue =
3134 local->hw.offchannel_tx_hw_queue;
3135 }
3136
3137 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3138 status->band);
Johannes Bergde1ede72008-09-09 14:42:50 +02003139 }
Johannes Berg39192c02008-09-09 14:49:03 +02003140 dev_kfree_skb(rx->skb);
3141 return RX_QUEUED;
Johannes Bergde1ede72008-09-09 14:42:50 +02003142}
3143
3144static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01003145ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02003146{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003147 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg77a121c2010-06-10 10:21:34 +02003148 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3149 __le16 stype;
Johannes Berg571ecf62007-07-27 15:43:22 +02003150
Johannes Berg77a121c2010-06-10 10:21:34 +02003151 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
Johannes Berg472dbc42008-09-11 00:01:49 +02003152
Johannes Berg77a121c2010-06-10 10:21:34 +02003153 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3154 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003155 sdata->vif.type != NL80211_IFTYPE_OCB &&
Johannes Berg77a121c2010-06-10 10:21:34 +02003156 sdata->vif.type != NL80211_IFTYPE_STATION)
3157 return RX_DROP_MONITOR;
Johannes Bergf9d540e2007-09-28 14:02:09 +02003158
Johannes Berg77a121c2010-06-10 10:21:34 +02003159 switch (stype) {
Johannes Berg66e67e42012-01-20 13:55:27 +01003160 case cpu_to_le16(IEEE80211_STYPE_AUTH):
Johannes Berg77a121c2010-06-10 10:21:34 +02003161 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3162 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3163 /* process for all: mesh, mlme, ibss */
3164 break;
Johannes Berg66e67e42012-01-20 13:55:27 +01003165 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3166 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
Johannes Berg77a121c2010-06-10 10:21:34 +02003167 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3168 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
Christian Lamparter2c313332010-11-29 20:53:23 +01003169 if (is_multicast_ether_addr(mgmt->da) &&
3170 !is_broadcast_ether_addr(mgmt->da))
3171 return RX_DROP_MONITOR;
3172
Johannes Berg77a121c2010-06-10 10:21:34 +02003173 /* process only for station */
3174 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3175 return RX_DROP_MONITOR;
3176 break;
3177 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08003178 /* process only for ibss and mesh */
3179 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3180 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
Johannes Berg77a121c2010-06-10 10:21:34 +02003181 return RX_DROP_MONITOR;
3182 break;
3183 default:
3184 return RX_DROP_MONITOR;
3185 }
Johannes Berg46900292009-02-15 12:44:28 +01003186
Johannes Berg77a121c2010-06-10 10:21:34 +02003187 /* queue up frame and kick off work to process it */
Johannes Bergc1475ca2010-06-10 10:21:37 +02003188 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg77a121c2010-06-10 10:21:34 +02003189 skb_queue_tail(&sdata->skb_queue, rx->skb);
3190 ieee80211_queue_work(&rx->local->hw, &sdata->work);
Johannes Berg8b58ff82010-06-10 10:21:51 +02003191 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02003192 rx->sta->rx_stats.packets++;
Johannes Berg77a121c2010-06-10 10:21:34 +02003193
3194 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02003195}
3196
Johannes Berg5f0b7de2009-11-16 13:58:21 +01003197static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3198 struct ieee80211_rate *rate)
Michael Wu3d30d942008-01-31 19:48:27 +01003199{
3200 struct ieee80211_sub_if_data *sdata;
3201 struct ieee80211_local *local = rx->local;
Michael Wu3d30d942008-01-31 19:48:27 +01003202 struct sk_buff *skb = rx->skb, *skb2;
3203 struct net_device *prev_dev = NULL;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003204 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg293702a2012-03-02 13:18:19 +01003205 int needed_headroom;
Michael Wu3d30d942008-01-31 19:48:27 +01003206
Johannes Berg554891e2010-09-24 12:38:25 +02003207 /*
3208 * If cooked monitor has been processed already, then
3209 * don't do it again. If not, set the flag.
3210 */
3211 if (rx->flags & IEEE80211_RX_CMNTR)
John W. Linville7c1e1832010-09-24 15:52:49 -04003212 goto out_free_skb;
Johannes Berg554891e2010-09-24 12:38:25 +02003213 rx->flags |= IEEE80211_RX_CMNTR;
John W. Linville7c1e1832010-09-24 15:52:49 -04003214
Johannes Berg152c4772011-10-21 10:22:22 +02003215 /* If there are no cooked monitor interfaces, just free the SKB */
3216 if (!local->cooked_mntrs)
3217 goto out_free_skb;
3218
Johannes Berg1f7bba72014-11-06 22:56:36 +01003219 /* vendor data is long removed here */
3220 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
Johannes Berg293702a2012-03-02 13:18:19 +01003221 /* room for the radiotap header based on driver features */
Johannes Berg1f7bba72014-11-06 22:56:36 +01003222 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
Johannes Berg293702a2012-03-02 13:18:19 +01003223
3224 if (skb_headroom(skb) < needed_headroom &&
3225 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
Michael Wu3d30d942008-01-31 19:48:27 +01003226 goto out_free_skb;
3227
Johannes Berg293702a2012-03-02 13:18:19 +01003228 /* prepend radiotap information */
Felix Fietkau973ef212012-04-16 14:56:48 +02003229 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3230 false);
Michael Wu3d30d942008-01-31 19:48:27 +01003231
Zhang Shengjud57a5442016-03-03 01:16:56 +00003232 skb_reset_mac_header(skb);
Michael Wu3d30d942008-01-31 19:48:27 +01003233 skb->ip_summed = CHECKSUM_UNNECESSARY;
3234 skb->pkt_type = PACKET_OTHERHOST;
3235 skb->protocol = htons(ETH_P_802_2);
3236
3237 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01003238 if (!ieee80211_sdata_running(sdata))
Michael Wu3d30d942008-01-31 19:48:27 +01003239 continue;
3240
Johannes Berg05c914f2008-09-11 00:01:58 +02003241 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Aviya Erenfeldd8212182016-08-29 23:25:15 +03003242 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
Michael Wu3d30d942008-01-31 19:48:27 +01003243 continue;
3244
3245 if (prev_dev) {
3246 skb2 = skb_clone(skb, GFP_ATOMIC);
3247 if (skb2) {
3248 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04003249 netif_receive_skb(skb2);
Michael Wu3d30d942008-01-31 19:48:27 +01003250 }
3251 }
3252
3253 prev_dev = sdata->dev;
Johannes Berg5a490512015-04-22 17:10:38 +02003254 ieee80211_rx_stats(sdata->dev, skb->len);
Michael Wu3d30d942008-01-31 19:48:27 +01003255 }
3256
3257 if (prev_dev) {
3258 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04003259 netif_receive_skb(skb);
Johannes Berg554891e2010-09-24 12:38:25 +02003260 return;
3261 }
Michael Wu3d30d942008-01-31 19:48:27 +01003262
3263 out_free_skb:
3264 dev_kfree_skb(skb);
3265}
3266
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003267static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3268 ieee80211_rx_result res)
3269{
3270 switch (res) {
3271 case RX_DROP_MONITOR:
3272 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3273 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02003274 rx->sta->rx_stats.dropped++;
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003275 /* fall through */
3276 case RX_CONTINUE: {
3277 struct ieee80211_rate *rate = NULL;
3278 struct ieee80211_supported_band *sband;
3279 struct ieee80211_rx_status *status;
3280
3281 status = IEEE80211_SKB_RXCB((rx->skb));
3282
3283 sband = rx->local->hw.wiphy->bands[status->band];
Johannes Berg56146182012-11-09 15:07:02 +01003284 if (!(status->flag & RX_FLAG_HT) &&
3285 !(status->flag & RX_FLAG_VHT))
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003286 rate = &sband->bitrates[status->rate_idx];
3287
3288 ieee80211_rx_cooked_monitor(rx, rate);
3289 break;
3290 }
3291 case RX_DROP_UNUSABLE:
3292 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3293 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02003294 rx->sta->rx_stats.dropped++;
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003295 dev_kfree_skb(rx->skb);
3296 break;
3297 case RX_QUEUED:
3298 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3299 break;
3300 }
3301}
3302
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003303static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3304 struct sk_buff_head *frames)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003305{
3306 ieee80211_rx_result res = RX_DROP_MONITOR;
3307 struct sk_buff *skb;
3308
3309#define CALL_RXH(rxh) \
3310 do { \
3311 res = rxh(rx); \
3312 if (res != RX_CONTINUE) \
3313 goto rxh_next; \
Johannes Berg8ebaa5b2016-03-31 20:02:04 +03003314 } while (0)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003315
Johannes Berg45ceeee2015-03-16 09:08:20 +01003316 /* Lock here to avoid hitting all of the data used in the RX
3317 * path (e.g. key data, station data, ...) concurrently when
3318 * a frame is released from the reorder buffer due to timeout
3319 * from the timer, potentially concurrently with RX from the
3320 * driver.
3321 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003322 spin_lock_bh(&rx->local->rx_path_lock);
Christian Lamparter24a8fda2010-12-30 17:25:29 +01003323
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003324 while ((skb = __skb_dequeue(frames))) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003325 /*
3326 * all the other fields are valid across frames
3327 * that belong to an aMPDU since they are on the
3328 * same TID from the same station
3329 */
3330 rx->skb = skb;
3331
Johannes Berg8ebaa5b2016-03-31 20:02:04 +03003332 CALL_RXH(ieee80211_rx_h_check_more_data);
3333 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3334 CALL_RXH(ieee80211_rx_h_sta_process);
3335 CALL_RXH(ieee80211_rx_h_decrypt);
3336 CALL_RXH(ieee80211_rx_h_defragment);
3337 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003338 /* must be after MMIC verify so header is counted in MPDU mic */
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003339#ifdef CONFIG_MAC80211_MESH
3340 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3341 CALL_RXH(ieee80211_rx_h_mesh_fwding);
3342#endif
Johannes Berg8ebaa5b2016-03-31 20:02:04 +03003343 CALL_RXH(ieee80211_rx_h_amsdu);
3344 CALL_RXH(ieee80211_rx_h_data);
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003345
3346 /* special treatment -- needs the queue */
3347 res = ieee80211_rx_h_ctrl(rx, frames);
3348 if (res != RX_CONTINUE)
3349 goto rxh_next;
3350
Johannes Berg8ebaa5b2016-03-31 20:02:04 +03003351 CALL_RXH(ieee80211_rx_h_mgmt_check);
3352 CALL_RXH(ieee80211_rx_h_action);
3353 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3354 CALL_RXH(ieee80211_rx_h_action_return);
3355 CALL_RXH(ieee80211_rx_h_mgmt);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003356
3357 rxh_next:
3358 ieee80211_rx_handlers_result(rx, res);
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003359
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003360#undef CALL_RXH
3361 }
Christian Lamparter24a8fda2010-12-30 17:25:29 +01003362
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003363 spin_unlock_bh(&rx->local->rx_path_lock);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003364}
Johannes Berg571ecf62007-07-27 15:43:22 +02003365
Johannes Berg4406c372010-09-24 11:21:06 +02003366static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
Johannes Berg58905292008-01-31 19:48:25 +01003367{
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003368 struct sk_buff_head reorder_release;
Johannes Berg58905292008-01-31 19:48:25 +01003369 ieee80211_rx_result res = RX_DROP_MONITOR;
3370
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003371 __skb_queue_head_init(&reorder_release);
3372
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02003373#define CALL_RXH(rxh) \
3374 do { \
3375 res = rxh(rx); \
3376 if (res != RX_CONTINUE) \
Johannes Berg2569a822009-11-25 17:46:17 +01003377 goto rxh_next; \
Johannes Berg8ebaa5b2016-03-31 20:02:04 +03003378 } while (0)
Johannes Berg58905292008-01-31 19:48:25 +01003379
Johannes Berg8ebaa5b2016-03-31 20:02:04 +03003380 CALL_RXH(ieee80211_rx_h_check_dup);
3381 CALL_RXH(ieee80211_rx_h_check);
Johannes Berg2569a822009-11-25 17:46:17 +01003382
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003383 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
Johannes Berg2569a822009-11-25 17:46:17 +01003384
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003385 ieee80211_rx_handlers(rx, &reorder_release);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003386 return;
Johannes Berg49461622008-06-30 15:10:45 +02003387
Johannes Berg2569a822009-11-25 17:46:17 +01003388 rxh_next:
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003389 ieee80211_rx_handlers_result(rx, res);
3390
3391#undef CALL_RXH
Johannes Berg58905292008-01-31 19:48:25 +01003392}
3393
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003394/*
Johannes Bergdd318572010-11-29 11:09:16 +01003395 * This function makes calls into the RX path, therefore
3396 * it has to be invoked under RCU read lock.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003397 */
3398void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3399{
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003400 struct sk_buff_head frames;
Johannes Berg554891e2010-09-24 12:38:25 +02003401 struct ieee80211_rx_data rx = {
3402 .sta = sta,
3403 .sdata = sta->sdata,
3404 .local = sta->local,
Johannes Berg9e262972011-07-07 18:45:03 +02003405 /* This is OK -- must be QoS data frame */
3406 .security_idx = tid,
3407 .seqno_idx = tid,
Johannes Bergaf9f9b22015-06-11 16:02:32 +02003408 .napi = NULL, /* must be NULL to not have races */
Johannes Berg554891e2010-09-24 12:38:25 +02003409 };
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003410 struct tid_ampdu_rx *tid_agg_rx;
3411
3412 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3413 if (!tid_agg_rx)
3414 return;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003415
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003416 __skb_queue_head_init(&frames);
3417
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003418 spin_lock(&tid_agg_rx->reorder_lock);
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003419 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003420 spin_unlock(&tid_agg_rx->reorder_lock);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003421
Emmanuel Grumbachb497de62015-04-20 22:53:38 +03003422 if (!skb_queue_empty(&frames)) {
3423 struct ieee80211_event event = {
3424 .type = BA_FRAME_TIMEOUT,
3425 .u.ba.tid = tid,
3426 .u.ba.sta = &sta->sta,
3427 };
3428 drv_event_callback(rx.local, rx.sdata, &event);
3429 }
3430
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003431 ieee80211_rx_handlers(&rx, &frames);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003432}
3433
Sara Sharon06470f72016-01-28 16:19:25 +02003434void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3435 u16 ssn, u64 filtered,
3436 u16 received_mpdus)
3437{
3438 struct sta_info *sta;
3439 struct tid_ampdu_rx *tid_agg_rx;
3440 struct sk_buff_head frames;
3441 struct ieee80211_rx_data rx = {
3442 /* This is OK -- must be QoS data frame */
3443 .security_idx = tid,
3444 .seqno_idx = tid,
3445 };
3446 int i, diff;
3447
3448 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3449 return;
3450
3451 __skb_queue_head_init(&frames);
3452
3453 sta = container_of(pubsta, struct sta_info, sta);
3454
3455 rx.sta = sta;
3456 rx.sdata = sta->sdata;
3457 rx.local = sta->local;
3458
3459 rcu_read_lock();
3460 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3461 if (!tid_agg_rx)
3462 goto out;
3463
3464 spin_lock_bh(&tid_agg_rx->reorder_lock);
3465
3466 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3467 int release;
3468
3469 /* release all frames in the reorder buffer */
3470 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3471 IEEE80211_SN_MODULO;
3472 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3473 release, &frames);
3474 /* update ssn to match received ssn */
3475 tid_agg_rx->head_seq_num = ssn;
3476 } else {
3477 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3478 &frames);
3479 }
3480
3481 /* handle the case that received ssn is behind the mac ssn.
3482 * it can be tid_agg_rx->buf_size behind and still be valid */
3483 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3484 if (diff >= tid_agg_rx->buf_size) {
3485 tid_agg_rx->reorder_buf_filtered = 0;
3486 goto release;
3487 }
3488 filtered = filtered >> diff;
3489 ssn += diff;
3490
3491 /* update bitmap */
3492 for (i = 0; i < tid_agg_rx->buf_size; i++) {
3493 int index = (ssn + i) % tid_agg_rx->buf_size;
3494
3495 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3496 if (filtered & BIT_ULL(i))
3497 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3498 }
3499
3500 /* now process also frames that the filter marking released */
3501 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3502
3503release:
3504 spin_unlock_bh(&tid_agg_rx->reorder_lock);
3505
3506 ieee80211_rx_handlers(&rx, &frames);
3507
3508 out:
3509 rcu_read_unlock();
3510}
3511EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3512
Johannes Berg571ecf62007-07-27 15:43:22 +02003513/* main receive path */
3514
Johannes Berga58fbe12015-04-22 15:08:39 +02003515static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
Johannes Berg23a24de2007-07-27 15:43:22 +02003516{
Johannes Berg20b01f82010-09-24 11:21:05 +02003517 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003518 struct sk_buff *skb = rx->skb;
Johannes Berga58fbe12015-04-22 15:08:39 +02003519 struct ieee80211_hdr *hdr = (void *)skb->data;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003520 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3521 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02003522 int multicast = is_multicast_ether_addr(hdr->addr1);
3523
Johannes Berg51fb61e2007-12-19 01:31:27 +01003524 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02003525 case NL80211_IFTYPE_STATION:
Johannes Berg9bc383d2009-11-19 11:55:19 +01003526 if (!bssid && !sdata->u.mgd.use_4addr)
Johannes Berg3c2723f52014-01-07 16:23:24 +01003527 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003528 if (multicast)
3529 return true;
3530 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
Johannes Berg05c914f2008-09-11 00:01:58 +02003531 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02003532 if (!bssid)
Johannes Berg3c2723f52014-01-07 16:23:24 +01003533 return false;
Felix Fietkau6329b8d2013-09-17 11:15:43 +02003534 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3535 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003536 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003537 if (ieee80211_is_beacon(hdr->frame_control))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003538 return true;
Johannes Berga58fbe12015-04-22 15:08:39 +02003539 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003540 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003541 if (!multicast &&
3542 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
Johannes Bergdf140462015-04-22 14:40:58 +02003543 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003544 if (!rx->sta) {
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003545 int rate_idx;
Johannes Berg56146182012-11-09 15:07:02 +01003546 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3547 rate_idx = 0; /* TODO: HT/VHT rates */
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003548 else
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003549 rate_idx = status->rate_idx;
Johannes Berg8bf11d82011-12-15 11:17:37 +01003550 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3551 BIT(rate_idx));
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003552 }
Johannes Berga58fbe12015-04-22 15:08:39 +02003553 return true;
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003554 case NL80211_IFTYPE_OCB:
3555 if (!bssid)
3556 return false;
Bertold Van den Berghcc117292015-08-05 16:02:42 +02003557 if (!ieee80211_is_data_present(hdr->frame_control))
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003558 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003559 if (!is_broadcast_ether_addr(bssid))
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003560 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003561 if (!multicast &&
3562 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
Johannes Bergdf140462015-04-22 14:40:58 +02003563 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003564 if (!rx->sta) {
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003565 int rate_idx;
3566 if (status->flag & RX_FLAG_HT)
3567 rate_idx = 0; /* TODO: HT rates */
3568 else
3569 rate_idx = status->rate_idx;
3570 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3571 BIT(rate_idx));
3572 }
Johannes Berga58fbe12015-04-22 15:08:39 +02003573 return true;
Johannes Berg05c914f2008-09-11 00:01:58 +02003574 case NL80211_IFTYPE_MESH_POINT:
Johannes Berga58fbe12015-04-22 15:08:39 +02003575 if (multicast)
3576 return true;
3577 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
Johannes Berg05c914f2008-09-11 00:01:58 +02003578 case NL80211_IFTYPE_AP_VLAN:
3579 case NL80211_IFTYPE_AP:
Johannes Berga58fbe12015-04-22 15:08:39 +02003580 if (!bssid)
3581 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3582
3583 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
Johannes Berg3df6eae2011-12-06 10:39:40 +01003584 /*
3585 * Accept public action frames even when the
3586 * BSSID doesn't match, this is used for P2P
3587 * and location updates. Note that mac80211
3588 * itself never looks at these frames.
3589 */
Johannes Berg2b9ccd42013-05-13 16:42:40 +02003590 if (!multicast &&
3591 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003592 return false;
Johannes Bergd48b2962012-07-06 22:19:27 +02003593 if (ieee80211_is_public_action(hdr, skb->len))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003594 return true;
Johannes Berg5c900672015-04-22 14:48:34 +02003595 return ieee80211_is_beacon(hdr->frame_control);
Johannes Berga58fbe12015-04-22 15:08:39 +02003596 }
3597
3598 if (!ieee80211_has_tods(hdr->frame_control)) {
Arik Nemtsovdb8e1732014-07-17 17:14:30 +03003599 /* ignore data frames to TDLS-peers */
3600 if (ieee80211_is_data(hdr->frame_control))
3601 return false;
3602 /* ignore action frames to TDLS-peers */
3603 if (ieee80211_is_action(hdr->frame_control) &&
Jouni Malinen1ec7bae2016-03-01 00:29:00 +02003604 !is_broadcast_ether_addr(bssid) &&
Arik Nemtsovdb8e1732014-07-17 17:14:30 +03003605 !ether_addr_equal(bssid, hdr->addr1))
3606 return false;
Johannes Berg23a24de2007-07-27 15:43:22 +02003607 }
Johannes Berga58fbe12015-04-22 15:08:39 +02003608 return true;
Johannes Berg05c914f2008-09-11 00:01:58 +02003609 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07003610 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003611 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003612 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
Johannes Bergf142c6b2012-06-18 20:07:15 +02003613 case NL80211_IFTYPE_P2P_DEVICE:
Johannes Berga58fbe12015-04-22 15:08:39 +02003614 return ieee80211_is_public_action(hdr, skb->len) ||
3615 ieee80211_is_probe_req(hdr->frame_control) ||
3616 ieee80211_is_probe_resp(hdr->frame_control) ||
3617 ieee80211_is_beacon(hdr->frame_control);
Ayala Bekercb3b7d82016-09-20 17:31:13 +03003618 case NL80211_IFTYPE_NAN:
3619 /* Currently no frames on NAN interface are allowed */
3620 return false;
Johannes Berg2ca27bc2010-09-16 14:58:23 +02003621 default:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02003622 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02003623 }
3624
Johannes Berga58fbe12015-04-22 15:08:39 +02003625 WARN_ON_ONCE(1);
3626 return false;
Johannes Berg23a24de2007-07-27 15:43:22 +02003627}
3628
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003629void ieee80211_check_fast_rx(struct sta_info *sta)
3630{
3631 struct ieee80211_sub_if_data *sdata = sta->sdata;
3632 struct ieee80211_local *local = sdata->local;
3633 struct ieee80211_key *key;
3634 struct ieee80211_fast_rx fastrx = {
3635 .dev = sdata->dev,
3636 .vif_type = sdata->vif.type,
3637 .control_port_protocol = sdata->control_port_protocol,
3638 }, *old, *new = NULL;
3639 bool assign = false;
3640
3641 /* use sparse to check that we don't return without updating */
3642 __acquire(check_fast_rx);
3643
3644 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3645 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3646 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3647 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3648
Johannes Bergc9c59622016-03-31 20:02:11 +03003649 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3650
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003651 /* fast-rx doesn't do reordering */
3652 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3653 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3654 goto clear;
3655
3656 switch (sdata->vif.type) {
3657 case NL80211_IFTYPE_STATION:
3658 /* 4-addr is harder to deal with, later maybe */
3659 if (sdata->u.mgd.use_4addr)
3660 goto clear;
3661 /* software powersave is a huge mess, avoid all of it */
3662 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3663 goto clear;
3664 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3665 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3666 goto clear;
3667 if (sta->sta.tdls) {
3668 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3669 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3670 fastrx.expected_ds_bits = 0;
3671 } else {
3672 fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3673 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3674 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3675 fastrx.expected_ds_bits =
3676 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3677 }
3678 break;
3679 case NL80211_IFTYPE_AP_VLAN:
3680 case NL80211_IFTYPE_AP:
3681 /* parallel-rx requires this, at least with calls to
3682 * ieee80211_sta_ps_transition()
3683 */
3684 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3685 goto clear;
3686 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3687 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3688 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3689
3690 fastrx.internal_forward =
3691 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3692 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3693 !sdata->u.vlan.sta);
3694 break;
3695 default:
3696 goto clear;
3697 }
3698
3699 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3700 goto clear;
3701
3702 rcu_read_lock();
3703 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3704 if (key) {
3705 switch (key->conf.cipher) {
3706 case WLAN_CIPHER_SUITE_TKIP:
3707 /* we don't want to deal with MMIC in fast-rx */
3708 goto clear_rcu;
3709 case WLAN_CIPHER_SUITE_CCMP:
3710 case WLAN_CIPHER_SUITE_CCMP_256:
3711 case WLAN_CIPHER_SUITE_GCMP:
3712 case WLAN_CIPHER_SUITE_GCMP_256:
3713 break;
3714 default:
3715 /* we also don't want to deal with WEP or cipher scheme
3716 * since those require looking up the key idx in the
3717 * frame, rather than assuming the PTK is used
3718 * (we need to revisit this once we implement the real
3719 * PTK index, which is now valid in the spec, but we
3720 * haven't implemented that part yet)
3721 */
3722 goto clear_rcu;
3723 }
3724
3725 fastrx.key = true;
3726 fastrx.icv_len = key->conf.icv_len;
3727 }
3728
3729 assign = true;
3730 clear_rcu:
3731 rcu_read_unlock();
3732 clear:
3733 __release(check_fast_rx);
3734
3735 if (assign)
3736 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3737
3738 spin_lock_bh(&sta->lock);
3739 old = rcu_dereference_protected(sta->fast_rx, true);
3740 rcu_assign_pointer(sta->fast_rx, new);
3741 spin_unlock_bh(&sta->lock);
3742
3743 if (old)
3744 kfree_rcu(old, rcu_head);
3745}
3746
3747void ieee80211_clear_fast_rx(struct sta_info *sta)
3748{
3749 struct ieee80211_fast_rx *old;
3750
3751 spin_lock_bh(&sta->lock);
3752 old = rcu_dereference_protected(sta->fast_rx, true);
3753 RCU_INIT_POINTER(sta->fast_rx, NULL);
3754 spin_unlock_bh(&sta->lock);
3755
3756 if (old)
3757 kfree_rcu(old, rcu_head);
3758}
3759
3760void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3761{
3762 struct ieee80211_local *local = sdata->local;
3763 struct sta_info *sta;
3764
3765 lockdep_assert_held(&local->sta_mtx);
3766
3767 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3768 if (sdata != sta->sdata &&
3769 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3770 continue;
3771 ieee80211_check_fast_rx(sta);
3772 }
3773}
3774
3775void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3776{
3777 struct ieee80211_local *local = sdata->local;
3778
3779 mutex_lock(&local->sta_mtx);
3780 __ieee80211_check_fast_rx_iface(sdata);
3781 mutex_unlock(&local->sta_mtx);
3782}
3783
3784static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3785 struct ieee80211_fast_rx *fast_rx)
3786{
3787 struct sk_buff *skb = rx->skb;
3788 struct ieee80211_hdr *hdr = (void *)skb->data;
3789 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3790 struct sta_info *sta = rx->sta;
3791 int orig_len = skb->len;
3792 int snap_offs = ieee80211_hdrlen(hdr->frame_control);
3793 struct {
3794 u8 snap[sizeof(rfc1042_header)];
3795 __be16 proto;
3796 } *payload __aligned(2);
3797 struct {
3798 u8 da[ETH_ALEN];
3799 u8 sa[ETH_ALEN];
3800 } addrs __aligned(2);
Johannes Bergc9c59622016-03-31 20:02:11 +03003801 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
3802
3803 if (fast_rx->uses_rss)
3804 stats = this_cpu_ptr(sta->pcpu_rx_stats);
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003805
3806 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3807 * to a common data structure; drivers can implement that per queue
3808 * but we don't have that information in mac80211
3809 */
3810 if (!(status->flag & RX_FLAG_DUP_VALIDATED))
3811 return false;
3812
3813#define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3814
3815 /* If using encryption, we also need to have:
3816 * - PN_VALIDATED: similar, but the implementation is tricky
3817 * - DECRYPTED: necessary for PN_VALIDATED
3818 */
3819 if (fast_rx->key &&
3820 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
3821 return false;
3822
3823 /* we don't deal with A-MSDU deaggregation here */
3824 if (status->rx_flags & IEEE80211_RX_AMSDU)
3825 return false;
3826
3827 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3828 return false;
3829
3830 if (unlikely(ieee80211_is_frag(hdr)))
3831 return false;
3832
3833 /* Since our interface address cannot be multicast, this
3834 * implicitly also rejects multicast frames without the
3835 * explicit check.
3836 *
3837 * We shouldn't get any *data* frames not addressed to us
3838 * (AP mode will accept multicast *management* frames), but
3839 * punting here will make it go through the full checks in
3840 * ieee80211_accept_frame().
3841 */
3842 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
3843 return false;
3844
3845 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
3846 IEEE80211_FCTL_TODS)) !=
3847 fast_rx->expected_ds_bits)
3848 goto drop;
3849
3850 /* assign the key to drop unencrypted frames (later)
3851 * and strip the IV/MIC if necessary
3852 */
3853 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
3854 /* GCMP header length is the same */
3855 snap_offs += IEEE80211_CCMP_HDR_LEN;
3856 }
3857
3858 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
3859 goto drop;
3860 payload = (void *)(skb->data + snap_offs);
3861
3862 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
3863 return false;
3864
3865 /* Don't handle these here since they require special code.
3866 * Accept AARP and IPX even though they should come with a
3867 * bridge-tunnel header - but if we get them this way then
3868 * there's little point in discarding them.
3869 */
3870 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
3871 payload->proto == fast_rx->control_port_protocol))
3872 return false;
3873
3874 /* after this point, don't punt to the slowpath! */
3875
3876 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
3877 pskb_trim(skb, skb->len - fast_rx->icv_len))
3878 goto drop;
3879
3880 if (unlikely(fast_rx->sta_notify)) {
3881 ieee80211_sta_rx_notify(rx->sdata, hdr);
3882 fast_rx->sta_notify = false;
3883 }
3884
3885 /* statistics part of ieee80211_rx_h_sta_process() */
Johannes Bergc9c59622016-03-31 20:02:11 +03003886 stats->last_rx = jiffies;
3887 stats->last_rate = sta_stats_encode_rate(status);
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003888
Johannes Bergc9c59622016-03-31 20:02:11 +03003889 stats->fragments++;
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003890
3891 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
Johannes Bergc9c59622016-03-31 20:02:11 +03003892 stats->last_signal = status->signal;
3893 if (!fast_rx->uses_rss)
3894 ewma_signal_add(&sta->rx_stats_avg.signal,
3895 -status->signal);
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003896 }
3897
3898 if (status->chains) {
3899 int i;
3900
Johannes Bergc9c59622016-03-31 20:02:11 +03003901 stats->chains = status->chains;
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003902 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
3903 int signal = status->chain_signal[i];
3904
3905 if (!(status->chains & BIT(i)))
3906 continue;
3907
Johannes Bergc9c59622016-03-31 20:02:11 +03003908 stats->chain_signal_last[i] = signal;
3909 if (!fast_rx->uses_rss)
3910 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
3911 -signal);
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003912 }
3913 }
3914 /* end of statistics */
3915
3916 if (rx->key && !ieee80211_has_protected(hdr->frame_control))
3917 goto drop;
3918
3919 /* do the header conversion - first grab the addresses */
3920 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
3921 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
3922 /* remove the SNAP but leave the ethertype */
3923 skb_pull(skb, snap_offs + sizeof(rfc1042_header));
3924 /* push the addresses in front */
3925 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
3926
3927 skb->dev = fast_rx->dev;
3928
3929 ieee80211_rx_stats(fast_rx->dev, skb->len);
3930
3931 /* The seqno index has the same property as needed
3932 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
3933 * for non-QoS-data frames. Here we know it's a data
3934 * frame, so count MSDUs.
3935 */
Johannes Bergc9c59622016-03-31 20:02:11 +03003936 u64_stats_update_begin(&stats->syncp);
3937 stats->msdu[rx->seqno_idx]++;
3938 stats->bytes += orig_len;
3939 u64_stats_update_end(&stats->syncp);
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003940
3941 if (fast_rx->internal_forward) {
3942 struct sta_info *dsta = sta_info_get(rx->sdata, skb->data);
3943
3944 if (dsta) {
3945 /*
3946 * Send to wireless media and increase priority by 256
3947 * to keep the received priority instead of
3948 * reclassifying the frame (see cfg80211_classify8021d).
3949 */
3950 skb->priority += 256;
3951 skb->protocol = htons(ETH_P_802_3);
3952 skb_reset_network_header(skb);
3953 skb_reset_mac_header(skb);
3954 dev_queue_xmit(skb);
3955 return true;
3956 }
3957 }
3958
3959 /* deliver to local stack */
3960 skb->protocol = eth_type_trans(skb, fast_rx->dev);
3961 memset(skb->cb, 0, sizeof(skb->cb));
3962 if (rx->napi)
3963 napi_gro_receive(rx->napi, skb);
3964 else
3965 netif_receive_skb(skb);
3966
3967 return true;
3968 drop:
3969 dev_kfree_skb(skb);
Johannes Bergc9c59622016-03-31 20:02:11 +03003970 stats->dropped++;
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003971 return true;
3972}
3973
Johannes Berg571ecf62007-07-27 15:43:22 +02003974/*
Johannes Berg4406c372010-09-24 11:21:06 +02003975 * This function returns whether or not the SKB
3976 * was destined for RX processing or not, which,
3977 * if consume is true, is equivalent to whether
3978 * or not the skb was consumed.
3979 */
3980static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3981 struct sk_buff *skb, bool consume)
3982{
3983 struct ieee80211_local *local = rx->local;
3984 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg4406c372010-09-24 11:21:06 +02003985
3986 rx->skb = skb;
Johannes Berg4406c372010-09-24 11:21:06 +02003987
Johannes Berg49ddf8e2016-03-31 20:02:10 +03003988 /* See if we can do fast-rx; if we have to copy we already lost,
3989 * so punt in that case. We should never have to deliver a data
3990 * frame to multiple interfaces anyway.
3991 *
3992 * We skip the ieee80211_accept_frame() call and do the necessary
3993 * checking inside ieee80211_invoke_fast_rx().
3994 */
3995 if (consume && rx->sta) {
3996 struct ieee80211_fast_rx *fast_rx;
3997
3998 fast_rx = rcu_dereference(rx->sta->fast_rx);
3999 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4000 return true;
4001 }
4002
Johannes Berga58fbe12015-04-22 15:08:39 +02004003 if (!ieee80211_accept_frame(rx))
Johannes Berg4406c372010-09-24 11:21:06 +02004004 return false;
4005
Johannes Berg4406c372010-09-24 11:21:06 +02004006 if (!consume) {
4007 skb = skb_copy(skb, GFP_ATOMIC);
4008 if (!skb) {
4009 if (net_ratelimit())
4010 wiphy_debug(local->hw.wiphy,
Ben Greearb305dae2011-01-08 10:30:54 -08004011 "failed to copy skb for %s\n",
Johannes Berg4406c372010-09-24 11:21:06 +02004012 sdata->name);
4013 return true;
4014 }
4015
4016 rx->skb = skb;
4017 }
4018
4019 ieee80211_invoke_rx_handlers(rx);
4020 return true;
4021}
4022
4023/*
Zhao, Gang6b59db72014-04-21 12:52:59 +08004024 * This is the actual Rx frames handler. as it belongs to Rx path it must
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02004025 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02004026 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02004027static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
Johannes Bergd63b5482016-03-31 20:02:02 +03004028 struct ieee80211_sta *pubsta,
Johannes Bergaf9f9b22015-06-11 16:02:32 +02004029 struct sk_buff *skb,
4030 struct napi_struct *napi)
Johannes Berg571ecf62007-07-27 15:43:22 +02004031{
4032 struct ieee80211_local *local = hw_to_local(hw);
4033 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02004034 struct ieee80211_hdr *hdr;
Zhu Yie3cf8b32010-03-29 17:35:07 +08004035 __le16 fc;
Johannes Berg5cf121c2008-02-25 16:27:43 +01004036 struct ieee80211_rx_data rx;
Johannes Berg4406c372010-09-24 11:21:06 +02004037 struct ieee80211_sub_if_data *prev;
Herbert Xu83e7e4c2016-09-19 19:00:10 +08004038 struct rhlist_head *tmp;
Zhu Yie3cf8b32010-03-29 17:35:07 +08004039 int err = 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02004040
Zhu Yie3cf8b32010-03-29 17:35:07 +08004041 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02004042 memset(&rx, 0, sizeof(rx));
4043 rx.skb = skb;
4044 rx.local = local;
Johannes Bergaf9f9b22015-06-11 16:02:32 +02004045 rx.napi = napi;
Johannes Berg72abd812007-09-17 01:29:22 -04004046
Zhu Yie3cf8b32010-03-29 17:35:07 +08004047 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
Johannes Bergc206ca62015-04-22 20:47:28 +02004048 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
Johannes Berg571ecf62007-07-27 15:43:22 +02004049
Johannes Berg4a4f1a52012-10-26 00:33:36 +02004050 if (ieee80211_is_mgmt(fc)) {
4051 /* drop frame if too short for header */
4052 if (skb->len < ieee80211_hdrlen(fc))
4053 err = -ENOBUFS;
4054 else
4055 err = skb_linearize(skb);
4056 } else {
Zhu Yie3cf8b32010-03-29 17:35:07 +08004057 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
Johannes Berg4a4f1a52012-10-26 00:33:36 +02004058 }
Zhu Yie3cf8b32010-03-29 17:35:07 +08004059
4060 if (err) {
4061 dev_kfree_skb(skb);
4062 return;
4063 }
4064
4065 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg38f37142008-01-29 17:07:43 +01004066 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01004067 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01004068
Johannes Bergd48b2962012-07-06 22:19:27 +02004069 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4070 ieee80211_is_beacon(hdr->frame_control)))
4071 ieee80211_scan_rx(local, skb);
4072
Johannes Bergd63b5482016-03-31 20:02:02 +03004073 if (pubsta) {
4074 rx.sta = container_of(pubsta, struct sta_info, sta);
4075 rx.sdata = rx.sta->sdata;
4076 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4077 return;
4078 goto out;
4079 } else if (ieee80211_is_data(fc)) {
4080 struct sta_info *sta, *prev_sta;
Johannes Berg7bedd0c2015-02-13 21:55:15 +01004081
Ben Greear56af3262010-09-23 10:22:24 -07004082 prev_sta = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02004083
Herbert Xu83e7e4c2016-09-19 19:00:10 +08004084 for_each_sta_info(local, hdr->addr2, sta, tmp) {
Ben Greear56af3262010-09-23 10:22:24 -07004085 if (!prev_sta) {
4086 prev_sta = sta;
4087 continue;
4088 }
4089
4090 rx.sta = prev_sta;
4091 rx.sdata = prev_sta->sdata;
Johannes Berg4406c372010-09-24 11:21:06 +02004092 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Johannes Berg571ecf62007-07-27 15:43:22 +02004093
Ben Greear56af3262010-09-23 10:22:24 -07004094 prev_sta = sta;
Johannes Berg4406c372010-09-24 11:21:06 +02004095 }
Ben Greear56af3262010-09-23 10:22:24 -07004096
4097 if (prev_sta) {
4098 rx.sta = prev_sta;
4099 rx.sdata = prev_sta->sdata;
4100
Johannes Berg4406c372010-09-24 11:21:06 +02004101 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
Ben Greear56af3262010-09-23 10:22:24 -07004102 return;
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05304103 goto out;
Ben Greear56af3262010-09-23 10:22:24 -07004104 }
Johannes Berg4406c372010-09-24 11:21:06 +02004105 }
4106
Johannes Berg4b0dd982010-09-24 11:21:07 +02004107 prev = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02004108
Johannes Berg4b0dd982010-09-24 11:21:07 +02004109 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4110 if (!ieee80211_sdata_running(sdata))
4111 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01004112
Johannes Berg4b0dd982010-09-24 11:21:07 +02004113 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4114 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4115 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01004116
Johannes Berg4b0dd982010-09-24 11:21:07 +02004117 /*
4118 * frame is destined for this interface, but if it's
4119 * not also for the previous one we handle that after
4120 * the loop to avoid copying the SKB once too much
4121 */
Johannes Bergb2e77712007-09-26 15:19:39 +02004122
Johannes Berg4b0dd982010-09-24 11:21:07 +02004123 if (!prev) {
Johannes Berg340e11f2007-07-27 15:43:22 +02004124 prev = sdata;
Johannes Berg4b0dd982010-09-24 11:21:07 +02004125 continue;
Johannes Berg8e6f00322007-07-27 15:43:22 +02004126 }
Felix Fietkau4bb29f82010-01-22 00:36:39 +01004127
Johannes Berg7852e362012-01-20 13:55:24 +01004128 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Johannes Berg4b0dd982010-09-24 11:21:07 +02004129 rx.sdata = prev;
4130 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01004131
Johannes Berg4b0dd982010-09-24 11:21:07 +02004132 prev = sdata;
4133 }
Johannes Berg4406c372010-09-24 11:21:06 +02004134
Johannes Berg4b0dd982010-09-24 11:21:07 +02004135 if (prev) {
Johannes Berg7852e362012-01-20 13:55:24 +01004136 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Johannes Berg4b0dd982010-09-24 11:21:07 +02004137 rx.sdata = prev;
4138
4139 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4140 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02004141 }
Johannes Berg4406c372010-09-24 11:21:06 +02004142
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05304143 out:
Johannes Berg4406c372010-09-24 11:21:06 +02004144 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02004145}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02004146
4147/*
4148 * This is the receive path handler. It is called by a low level driver when an
4149 * 802.11 MPDU is received from the hardware.
4150 */
Johannes Bergd63b5482016-03-31 20:02:02 +03004151void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4152 struct sk_buff *skb, struct napi_struct *napi)
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02004153{
4154 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01004155 struct ieee80211_rate *rate = NULL;
4156 struct ieee80211_supported_band *sband;
Johannes Bergf1d58c22009-06-17 13:13:00 +02004157 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg8318d782008-01-24 19:38:38 +01004158
Johannes Bergd20ef632009-10-11 15:10:40 +02004159 WARN_ON_ONCE(softirq_count() == 0);
4160
Johannes Berg57fbcce2016-04-12 15:56:15 +02004161 if (WARN_ON(status->band >= NUM_NL80211_BANDS))
Johannes Berg77a980d2009-08-24 11:46:30 +02004162 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01004163
4164 sband = local->hw.wiphy->bands[status->band];
Johannes Berg77a980d2009-08-24 11:46:30 +02004165 if (WARN_ON(!sband))
4166 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01004167
Johannes Berg89c3a8a2009-07-28 18:10:17 +02004168 /*
4169 * If we're suspending, it is possible although not too likely
4170 * that we'd be receiving frames after having already partially
4171 * quiesced the stack. We can't process such frames then since
4172 * that might, for example, cause stations to be added or other
4173 * driver callbacks be invoked.
4174 */
Johannes Berg77a980d2009-08-24 11:46:30 +02004175 if (unlikely(local->quiescing || local->suspended))
4176 goto drop;
Johannes Berg89c3a8a2009-07-28 18:10:17 +02004177
Arik Nemtsov04800ad2012-06-06 11:25:02 +03004178 /* We might be during a HW reconfig, prevent Rx for the same reason */
4179 if (unlikely(local->in_reconfig))
4180 goto drop;
4181
Johannes Bergea77f122009-08-21 14:44:45 +02004182 /*
4183 * The same happens when we're not even started,
4184 * but that's worth a warning.
4185 */
Johannes Berg77a980d2009-08-24 11:46:30 +02004186 if (WARN_ON(!local->started))
4187 goto drop;
Johannes Bergea77f122009-08-21 14:44:45 +02004188
Johannes Bergfc885182010-07-30 13:23:12 +02004189 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05004190 /*
Johannes Bergfc885182010-07-30 13:23:12 +02004191 * Validate the rate, unless a PLCP error means that
4192 * we probably can't have a valid rate here anyway.
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05004193 */
Johannes Bergfc885182010-07-30 13:23:12 +02004194
4195 if (status->flag & RX_FLAG_HT) {
4196 /*
4197 * rate_idx is MCS index, which can be [0-76]
4198 * as documented on:
4199 *
4200 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4201 *
4202 * Anything else would be some sort of driver or
4203 * hardware error. The driver should catch hardware
4204 * errors.
4205 */
Johannes Berg444e38032012-09-30 17:08:35 +02004206 if (WARN(status->rate_idx > 76,
Johannes Bergfc885182010-07-30 13:23:12 +02004207 "Rate marked as an HT rate but passed "
4208 "status->rate_idx is not "
4209 "an MCS index [0-76]: %d (0x%02x)\n",
4210 status->rate_idx,
4211 status->rate_idx))
4212 goto drop;
Johannes Berg56146182012-11-09 15:07:02 +01004213 } else if (status->flag & RX_FLAG_VHT) {
4214 if (WARN_ONCE(status->rate_idx > 9 ||
4215 !status->vht_nss ||
4216 status->vht_nss > 8,
4217 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4218 status->rate_idx, status->vht_nss))
4219 goto drop;
Johannes Bergfc885182010-07-30 13:23:12 +02004220 } else {
Johannes Berg444e38032012-09-30 17:08:35 +02004221 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
Johannes Bergfc885182010-07-30 13:23:12 +02004222 goto drop;
4223 rate = &sband->bitrates[status->rate_idx];
4224 }
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02004225 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02004226
Johannes Berg554891e2010-09-24 12:38:25 +02004227 status->rx_flags = 0;
4228
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02004229 /*
4230 * key references and virtual interfaces are protected using RCU
4231 * and this requires that we are in a read-side RCU section during
4232 * receive processing
4233 */
4234 rcu_read_lock();
4235
4236 /*
4237 * Frames with failed FCS/PLCP checksum are not returned,
4238 * all other frames are returned without radiotap header
4239 * if it was previously present.
4240 * Also, frames with less than 16 bytes are dropped.
4241 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02004242 skb = ieee80211_rx_monitor(local, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02004243 if (!skb) {
4244 rcu_read_unlock();
4245 return;
4246 }
4247
Johannes Berge1e54062010-11-30 08:58:45 +01004248 ieee80211_tpt_led_trig_rx(local,
4249 ((struct ieee80211_hdr *)skb->data)->frame_control,
4250 skb->len);
Johannes Bergd63b5482016-03-31 20:02:02 +03004251
4252 __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02004253
4254 rcu_read_unlock();
Johannes Berg77a980d2009-08-24 11:46:30 +02004255
4256 return;
4257 drop:
4258 kfree_skb(skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02004259}
Johannes Bergaf9f9b22015-06-11 16:02:32 +02004260EXPORT_SYMBOL(ieee80211_rx_napi);
Johannes Berg571ecf62007-07-27 15:43:22 +02004261
4262/* This is a version of the rx handler that can be called from hard irq
4263 * context. Post the skb on the queue and schedule the tasklet */
Johannes Bergf1d58c22009-06-17 13:13:00 +02004264void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02004265{
4266 struct ieee80211_local *local = hw_to_local(hw);
4267
4268 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4269
Johannes Berg571ecf62007-07-27 15:43:22 +02004270 skb->pkt_type = IEEE80211_RX_MSG;
4271 skb_queue_tail(&local->skb_queue, skb);
4272 tasklet_schedule(&local->tasklet);
4273}
4274EXPORT_SYMBOL(ieee80211_rx_irqsafe);