blob: d64e285400aaab3245c31af4ec6401cd1e77b294 [file] [log] [blame]
Johannes Berg571ecf62007-07-27 15:43:22 +02001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
Johannes Berg84040802010-02-15 12:46:39 +02005 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
Johannes Berg571ecf62007-07-27 15:43:22 +02006 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
S.Çağlar Onurab466232008-02-14 17:36:47 +020012#include <linux/jiffies.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020014#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
Johannes Bergd4e46a32007-09-14 11:10:24 -040018#include <linux/rcupdate.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040019#include <linux/export.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020020#include <net/mac80211.h>
21#include <net/ieee80211_radiotap.h>
Johannes Bergd26ad372012-02-20 11:38:41 +010022#include <asm/unaligned.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020023
24#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020025#include "driver-ops.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040026#include "led.h"
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +010027#include "mesh.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020028#include "wep.h"
29#include "wpa.h"
30#include "tkip.h"
31#include "wme.h"
Johannes Berg1d8d3de2011-12-16 15:28:57 +010032#include "rate.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020033
Johannes Bergb2e77712007-09-26 15:19:39 +020034/*
35 * monitor mode reception
36 *
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
39 */
40static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
Johannes Berg0869aea2009-10-28 10:03:35 +010041 struct sk_buff *skb)
Johannes Bergb2e77712007-09-26 15:19:39 +020042{
Johannes Bergb2e77712007-09-26 15:19:39 +020043 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
44 if (likely(skb->len > FCS_LEN))
Zhu Yie3cf8b32010-03-29 17:35:07 +080045 __pskb_trim(skb, skb->len - FCS_LEN);
Johannes Bergb2e77712007-09-26 15:19:39 +020046 else {
47 /* driver bug */
48 WARN_ON(1);
49 dev_kfree_skb(skb);
50 skb = NULL;
51 }
52 }
53
54 return skb;
55}
56
Johannes Bergf1d58c22009-06-17 13:13:00 +020057static inline int should_drop_frame(struct sk_buff *skb,
Johannes Berg0869aea2009-10-28 10:03:35 +010058 int present_fcs_len)
Johannes Bergb2e77712007-09-26 15:19:39 +020059{
Johannes Bergf1d58c22009-06-17 13:13:00 +020060 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Harvey Harrison182503a2008-06-22 16:45:29 -070061 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Bergb2e77712007-09-26 15:19:39 +020062
63 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
64 return 1;
Johannes Berg0869aea2009-10-28 10:03:35 +010065 if (unlikely(skb->len < 16 + present_fcs_len))
Johannes Bergb2e77712007-09-26 15:19:39 +020066 return 1;
Harvey Harrison87228f52008-06-11 14:21:59 -070067 if (ieee80211_is_ctl(hdr->frame_control) &&
68 !ieee80211_is_pspoll(hdr->frame_control) &&
69 !ieee80211_is_back_req(hdr->frame_control))
Johannes Bergb2e77712007-09-26 15:19:39 +020070 return 1;
71 return 0;
72}
73
Bruno Randolf601ae7f2008-05-08 19:22:43 +020074static int
75ieee80211_rx_radiotap_len(struct ieee80211_local *local,
76 struct ieee80211_rx_status *status)
77{
78 int len;
79
80 /* always present fields */
81 len = sizeof(struct ieee80211_radiotap_header) + 9;
82
Johannes Berg6ebacbb2011-02-23 15:06:08 +010083 if (status->flag & RX_FLAG_MACTIME_MPDU)
Bruno Randolf601ae7f2008-05-08 19:22:43 +020084 len += 8;
Johannes Berg7fee5372009-01-30 11:13:06 +010085 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
Bruno Randolf601ae7f2008-05-08 19:22:43 +020086 len += 1;
Bruno Randolf601ae7f2008-05-08 19:22:43 +020087
88 if (len & 1) /* padding for RX_FLAGS if necessary */
89 len++;
90
Johannes Berg6d744ba2011-01-27 14:13:17 +010091 if (status->flag & RX_FLAG_HT) /* HT info */
92 len += 3;
93
Bruno Randolf601ae7f2008-05-08 19:22:43 +020094 return len;
95}
96
Johannes Bergd1c3a372009-01-07 00:26:10 +010097/*
Bruno Randolf601ae7f2008-05-08 19:22:43 +020098 * ieee80211_add_rx_radiotap_header - add radiotap header
99 *
100 * add a radiotap header containing all the fields which the hardware provided.
101 */
102static void
103ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
104 struct sk_buff *skb,
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200105 struct ieee80211_rate *rate,
Felix Fietkau973ef212012-04-16 14:56:48 +0200106 int rtap_len, bool has_fcs)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200107{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200108 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200109 struct ieee80211_radiotap_header *rthdr;
110 unsigned char *pos;
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100111 u16 rx_flags = 0;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200112
113 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
114 memset(rthdr, 0, rtap_len);
115
116 /* radiotap header, set always present flags */
117 rthdr->it_present =
118 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200119 (1 << IEEE80211_RADIOTAP_CHANNEL) |
120 (1 << IEEE80211_RADIOTAP_ANTENNA) |
121 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
122 rthdr->it_len = cpu_to_le16(rtap_len);
123
124 pos = (unsigned char *)(rthdr+1);
125
126 /* the order of the following fields is important */
127
128 /* IEEE80211_RADIOTAP_TSFT */
Johannes Berg6ebacbb2011-02-23 15:06:08 +0100129 if (status->flag & RX_FLAG_MACTIME_MPDU) {
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100130 put_unaligned_le64(status->mactime, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200131 rthdr->it_present |=
132 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
133 pos += 8;
134 }
135
136 /* IEEE80211_RADIOTAP_FLAGS */
Felix Fietkau973ef212012-04-16 14:56:48 +0200137 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200138 *pos |= IEEE80211_RADIOTAP_F_FCS;
Johannes Bergaae89832009-03-13 12:52:10 +0100139 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
140 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
Bruno Randolfb4f28bb2008-07-30 17:19:55 +0200141 if (status->flag & RX_FLAG_SHORTPRE)
142 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200143 pos++;
144
145 /* IEEE80211_RADIOTAP_RATE */
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100146 if (!rate || status->flag & RX_FLAG_HT) {
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200147 /*
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100148 * Without rate information don't add it. If we have,
Mohammed Shafi Shajakhan38f37be2011-02-07 10:10:04 +0530149 * MCS information is a separate field in radiotap,
Johannes Berg73b48092011-04-18 17:05:21 +0200150 * added below. The byte here is needed as padding
151 * for the channel though, so initialise it to 0.
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200152 */
153 *pos = 0;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200154 } else {
Jouni Malinenebe6c7b2009-01-10 11:47:33 +0200155 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200156 *pos = rate->bitrate / 5;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200157 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200158 pos++;
159
160 /* IEEE80211_RADIOTAP_CHANNEL */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100161 put_unaligned_le16(status->freq, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200162 pos += 2;
163 if (status->band == IEEE80211_BAND_5GHZ)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100164 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
165 pos);
Johannes Berg5f0b7de2009-11-16 13:58:21 +0100166 else if (status->flag & RX_FLAG_HT)
167 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
168 pos);
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100169 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100170 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
171 pos);
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100172 else if (rate)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100173 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
174 pos);
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100175 else
176 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200177 pos += 2;
178
179 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
Felix Fietkaufe8431f2012-03-01 18:00:07 +0100180 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
181 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200182 *pos = status->signal;
183 rthdr->it_present |=
184 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
185 pos++;
186 }
187
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200188 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
189
190 /* IEEE80211_RADIOTAP_ANTENNA */
191 *pos = status->antenna;
192 pos++;
193
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200194 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
195
196 /* IEEE80211_RADIOTAP_RX_FLAGS */
197 /* ensure 2 byte alignment for the 2 byte field as required */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100198 if ((pos - (u8 *)rthdr) & 1)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200199 pos++;
Johannes Bergaae89832009-03-13 12:52:10 +0100200 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100201 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
202 put_unaligned_le16(rx_flags, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200203 pos += 2;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100204
205 if (status->flag & RX_FLAG_HT) {
206 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
207 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
208 IEEE80211_RADIOTAP_MCS_HAVE_GI |
209 IEEE80211_RADIOTAP_MCS_HAVE_BW;
210 *pos = 0;
211 if (status->flag & RX_FLAG_SHORT_GI)
212 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
213 if (status->flag & RX_FLAG_40MHZ)
214 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
215 pos++;
216 *pos++ = status->rate_idx;
217 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200218}
219
Johannes Bergb2e77712007-09-26 15:19:39 +0200220/*
221 * This function copies a received frame to all monitor interfaces and
222 * returns a cleaned-up SKB that no longer includes the FCS nor the
223 * radiotap header the driver might have added.
224 */
225static struct sk_buff *
226ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
Johannes Berg8318d782008-01-24 19:38:38 +0100227 struct ieee80211_rate *rate)
Johannes Bergb2e77712007-09-26 15:19:39 +0200228{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200229 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200230 struct ieee80211_sub_if_data *sdata;
Johannes Berg293702a2012-03-02 13:18:19 +0100231 int needed_headroom;
Johannes Bergb2e77712007-09-26 15:19:39 +0200232 struct sk_buff *skb, *skb2;
233 struct net_device *prev_dev = NULL;
234 int present_fcs_len = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200235
236 /*
237 * First, we may need to make a copy of the skb because
238 * (1) we need to modify it for radiotap (if not present), and
239 * (2) the other RX handlers will modify the skb we got.
240 *
241 * We don't need to, of course, if we aren't going to return
242 * the SKB because it has a bad FCS/PLCP checksum.
243 */
Johannes Berg0869aea2009-10-28 10:03:35 +0100244
245 /* room for the radiotap header based on driver features */
246 needed_headroom = ieee80211_rx_radiotap_len(local, status);
Johannes Bergb2e77712007-09-26 15:19:39 +0200247
248 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
249 present_fcs_len = FCS_LEN;
250
Zhu Yie3cf8b32010-03-29 17:35:07 +0800251 /* make sure hdr->frame_control is on the linear part */
252 if (!pskb_may_pull(origskb, 2)) {
253 dev_kfree_skb(origskb);
254 return NULL;
255 }
256
Johannes Bergb2e77712007-09-26 15:19:39 +0200257 if (!local->monitors) {
Johannes Berg0869aea2009-10-28 10:03:35 +0100258 if (should_drop_frame(origskb, present_fcs_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200259 dev_kfree_skb(origskb);
260 return NULL;
261 }
262
Johannes Berg0869aea2009-10-28 10:03:35 +0100263 return remove_monitor_info(local, origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200264 }
265
Johannes Berg0869aea2009-10-28 10:03:35 +0100266 if (should_drop_frame(origskb, present_fcs_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200267 /* only need to expand headroom if necessary */
268 skb = origskb;
269 origskb = NULL;
270
271 /*
272 * This shouldn't trigger often because most devices have an
273 * RX header they pull before we get here, and that should
274 * be big enough for our radiotap information. We should
275 * probably export the length to drivers so that we can have
276 * them allocate enough headroom to start with.
277 */
278 if (skb_headroom(skb) < needed_headroom &&
Johannes Bergc49e5ea2007-12-11 21:33:42 +0100279 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200280 dev_kfree_skb(skb);
281 return NULL;
282 }
283 } else {
284 /*
285 * Need to make a copy and possibly remove radiotap header
286 * and FCS from the original.
287 */
288 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
289
Johannes Berg0869aea2009-10-28 10:03:35 +0100290 origskb = remove_monitor_info(local, origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200291
292 if (!skb)
293 return origskb;
294 }
295
Johannes Berg0869aea2009-10-28 10:03:35 +0100296 /* prepend radiotap information */
Felix Fietkau973ef212012-04-16 14:56:48 +0200297 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
298 true);
Johannes Bergb2e77712007-09-26 15:19:39 +0200299
Johannes Bergce3edf6d02007-12-19 01:31:22 +0100300 skb_reset_mac_header(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200301 skb->ip_summed = CHECKSUM_UNNECESSARY;
302 skb->pkt_type = PACKET_OTHERHOST;
303 skb->protocol = htons(ETH_P_802_2);
304
305 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200306 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +0200307 continue;
308
Michael Wu3d30d942008-01-31 19:48:27 +0100309 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
310 continue;
311
Johannes Berg9607e6b2009-12-23 13:15:31 +0100312 if (!ieee80211_sdata_running(sdata))
Johannes Berg47846c92009-11-25 17:46:19 +0100313 continue;
314
Johannes Bergb2e77712007-09-26 15:19:39 +0200315 if (prev_dev) {
316 skb2 = skb_clone(skb, GFP_ATOMIC);
317 if (skb2) {
318 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400319 netif_receive_skb(skb2);
Johannes Bergb2e77712007-09-26 15:19:39 +0200320 }
321 }
322
323 prev_dev = sdata->dev;
324 sdata->dev->stats.rx_packets++;
325 sdata->dev->stats.rx_bytes += skb->len;
326 }
327
328 if (prev_dev) {
329 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400330 netif_receive_skb(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200331 } else
332 dev_kfree_skb(skb);
333
334 return origskb;
335}
336
337
Johannes Berg5cf121c2008-02-25 16:27:43 +0100338static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200339{
Harvey Harrison238f74a2008-07-02 11:05:34 -0700340 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +0200341 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg9e262972011-07-07 18:45:03 +0200342 int tid, seqno_idx, security_idx;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200343
344 /* does the frame have a qos control field? */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700345 if (ieee80211_is_data_qos(hdr->frame_control)) {
346 u8 *qc = ieee80211_get_qos_ctl(hdr);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200347 /* frame has qos control */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700348 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
Johannes Berg04b7dcf2011-06-22 10:06:59 +0200349 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
Johannes Berg554891e2010-09-24 12:38:25 +0200350 status->rx_flags |= IEEE80211_RX_AMSDU;
Johannes Berg9e262972011-07-07 18:45:03 +0200351
352 seqno_idx = tid;
353 security_idx = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200354 } else {
Johannes Berg1411f9b2008-07-10 10:11:02 +0200355 /*
356 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
357 *
358 * Sequence numbers for management frames, QoS data
359 * frames with a broadcast/multicast address in the
360 * Address 1 field, and all non-QoS data frames sent
361 * by QoS STAs are assigned using an additional single
362 * modulo-4096 counter, [...]
363 *
364 * We also use that counter for non-QoS STAs.
365 */
Johannes Berg9e262972011-07-07 18:45:03 +0200366 seqno_idx = NUM_RX_DATA_QUEUES;
367 security_idx = 0;
368 if (ieee80211_is_mgmt(hdr->frame_control))
369 security_idx = NUM_RX_DATA_QUEUES;
370 tid = 0;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200371 }
Johannes Berg52865df2007-07-27 15:43:22 +0200372
Johannes Berg9e262972011-07-07 18:45:03 +0200373 rx->seqno_idx = seqno_idx;
374 rx->security_idx = security_idx;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200375 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
376 * For now, set skb->priority to 0 for other cases. */
377 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100378}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200379
Johannes Bergd1c3a372009-01-07 00:26:10 +0100380/**
381 * DOC: Packet alignment
382 *
383 * Drivers always need to pass packets that are aligned to two-byte boundaries
384 * to the stack.
385 *
386 * Additionally, should, if possible, align the payload data in a way that
387 * guarantees that the contained IP header is aligned to a four-byte
388 * boundary. In the case of regular frames, this simply means aligning the
389 * payload to a four-byte boundary (because either the IP header is directly
390 * contained, or IV/RFC1042 headers that have a length divisible by four are
Kalle Valo59d9cb02009-12-17 13:54:57 +0100391 * in front of it). If the payload data is not properly aligned and the
392 * architecture doesn't support efficient unaligned operations, mac80211
393 * will align the data.
Johannes Bergd1c3a372009-01-07 00:26:10 +0100394 *
395 * With A-MSDU frames, however, the payload data address must yield two modulo
396 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
397 * push the IP header further back to a multiple of four again. Thankfully, the
398 * specs were sane enough this time around to require padding each A-MSDU
399 * subframe to a length that is a multiple of four.
400 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300401 * Padding like Atheros hardware adds which is between the 802.11 header and
Johannes Bergd1c3a372009-01-07 00:26:10 +0100402 * the payload is not supported, the driver is required to move the 802.11
403 * header to be directly in front of the payload in that case.
404 */
405static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
Johannes Berg38f37142008-01-29 17:07:43 +0100406{
Kalle Valo59d9cb02009-12-17 13:54:57 +0100407#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
408 WARN_ONCE((unsigned long)rx->skb->data & 1,
409 "unaligned packet at 0x%p\n", rx->skb->data);
Johannes Bergd1c3a372009-01-07 00:26:10 +0100410#endif
Johannes Berg6e0d1142007-07-27 15:43:22 +0200411}
412
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +0200413
Johannes Berg571ecf62007-07-27 15:43:22 +0200414/* rx handlers */
415
Johannes Berg49461622008-06-30 15:10:45 +0200416static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100417ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200418{
419 struct ieee80211_local *local = rx->local;
Johannes Berg554891e2010-09-24 12:38:25 +0200420 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200421 struct sk_buff *skb = rx->skb;
422
Luciano Coelho79f460c2011-05-11 17:09:36 +0300423 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
424 !local->sched_scanning))
Johannes Berg4080c7c2010-09-24 11:21:08 +0200425 return RX_CONTINUE;
426
Ben Greearb23b0252011-02-04 11:54:17 -0800427 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
Luciano Coelho79f460c2011-05-11 17:09:36 +0300428 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
429 local->sched_scanning)
Johannes Bergf1d58c22009-06-17 13:13:00 +0200430 return ieee80211_scan_rx(rx->sdata, skb);
Zhu Yiece8edd2007-11-22 10:53:21 +0800431
Johannes Berg4080c7c2010-09-24 11:21:08 +0200432 /* scanning finished during invoking of handlers */
433 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
434 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200435}
436
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200437
438static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
439{
440 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
441
442 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
443 return 0;
444
445 return ieee80211_is_robust_mgmt_frame(hdr);
446}
447
448
449static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
450{
451 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
452
453 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
454 return 0;
455
456 return ieee80211_is_robust_mgmt_frame(hdr);
457}
458
459
460/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
461static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
462{
463 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
464 struct ieee80211_mmie *mmie;
465
466 if (skb->len < 24 + sizeof(*mmie) ||
467 !is_multicast_ether_addr(hdr->da))
468 return -1;
469
470 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
471 return -1; /* not a robust management frame */
472
473 mmie = (struct ieee80211_mmie *)
474 (skb->data + skb->len - sizeof(*mmie));
475 if (mmie->element_id != WLAN_EID_MMIE ||
476 mmie->length != sizeof(*mmie) - 2)
477 return -1;
478
479 return le16_to_cpu(mmie->key_id);
480}
481
482
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100483static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100484ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100485{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700486 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg47846c92009-11-25 17:46:19 +0100487 char *dev_addr = rx->sdata->vif.addr;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100488
Harvey Harrisona7767f92008-07-02 16:30:51 -0700489 if (ieee80211_is_data(hdr->frame_control)) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700490 if (is_multicast_ether_addr(hdr->addr1)) {
491 if (ieee80211_has_tods(hdr->frame_control) ||
492 !ieee80211_has_fromds(hdr->frame_control))
493 return RX_DROP_MONITOR;
Felix Fietkau888d04d2012-03-01 15:22:09 +0100494 if (compare_ether_addr(hdr->addr3, dev_addr) == 0)
Javier Cardona3c5772a2009-08-10 12:15:48 -0700495 return RX_DROP_MONITOR;
496 } else {
497 if (!ieee80211_has_a4(hdr->frame_control))
498 return RX_DROP_MONITOR;
Felix Fietkau888d04d2012-03-01 15:22:09 +0100499 if (compare_ether_addr(hdr->addr4, dev_addr) == 0)
Javier Cardona3c5772a2009-08-10 12:15:48 -0700500 return RX_DROP_MONITOR;
501 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100502 }
503
504 /* If there is not an established peer link and this is not a peer link
505 * establisment frame, beacon or probe, drop the frame.
506 */
507
Javier Cardona57cf8042011-05-13 10:45:43 -0700508 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100509 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100510
Harvey Harrisona7767f92008-07-02 16:30:51 -0700511 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100512 return RX_DROP_MONITOR;
513
Harvey Harrisona7767f92008-07-02 16:30:51 -0700514 if (ieee80211_is_action(hdr->frame_control)) {
Javier Cardonad3aaec82011-05-03 16:57:09 -0700515 u8 category;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100516 mgmt = (struct ieee80211_mgmt *)hdr;
Javier Cardonad3aaec82011-05-03 16:57:09 -0700517 category = mgmt->u.action.category;
518 if (category != WLAN_CATEGORY_MESH_ACTION &&
519 category != WLAN_CATEGORY_SELF_PROTECTED)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100520 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100521 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100522 }
523
Harvey Harrisona7767f92008-07-02 16:30:51 -0700524 if (ieee80211_is_probe_req(hdr->frame_control) ||
525 ieee80211_is_probe_resp(hdr->frame_control) ||
Javier Cardona71839122011-04-07 15:08:31 -0700526 ieee80211_is_beacon(hdr->frame_control) ||
527 ieee80211_is_auth(hdr->frame_control))
Harvey Harrisona7767f92008-07-02 16:30:51 -0700528 return RX_CONTINUE;
529
530 return RX_DROP_MONITOR;
531
532 }
533
Johannes Berg902acc72008-02-23 15:17:19 +0100534 return RX_CONTINUE;
535}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100536
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100537#define SEQ_MODULO 0x1000
538#define SEQ_MASK 0xfff
539
540static inline int seq_less(u16 sq1, u16 sq2)
541{
542 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
543}
544
545static inline u16 seq_inc(u16 sq)
546{
547 return (sq + 1) & SEQ_MASK;
548}
549
550static inline u16 seq_sub(u16 sq1, u16 sq2)
551{
552 return (sq1 - sq2) & SEQ_MASK;
553}
554
555
556static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
557 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100558 int index)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100559{
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100560 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100561 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
Christian Lamparter4cfda472010-12-27 23:21:26 +0100562 struct ieee80211_rx_status *status;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100563
Johannes Bergdd318572010-11-29 11:09:16 +0100564 lockdep_assert_held(&tid_agg_rx->reorder_lock);
565
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100566 if (!skb)
567 goto no_frame;
568
Christian Lamparter071d9ac2010-08-05 01:36:36 +0200569 /* release the frame from the reorder ring buffer */
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100570 tid_agg_rx->stored_mpdu_num--;
571 tid_agg_rx->reorder_buf[index] = NULL;
Christian Lamparter4cfda472010-12-27 23:21:26 +0100572 status = IEEE80211_SKB_RXCB(skb);
573 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100574 skb_queue_tail(&local->rx_skb_queue, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100575
576no_frame:
577 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
578}
579
580static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
581 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100582 u16 head_seq_num)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100583{
584 int index;
585
Johannes Bergdd318572010-11-29 11:09:16 +0100586 lockdep_assert_held(&tid_agg_rx->reorder_lock);
587
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100588 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
589 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
590 tid_agg_rx->buf_size;
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100591 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100592 }
593}
594
595/*
596 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
597 * the skb was added to the buffer longer than this time ago, the earlier
598 * frames that have not yet been received are assumed to be lost and the skb
599 * can be released for processing. This may also release other skb's from the
600 * reorder buffer if there are no additional gaps between the frames.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200601 *
602 * Callers must hold tid_agg_rx->reorder_lock.
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100603 */
604#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
605
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200606static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100607 struct tid_ampdu_rx *tid_agg_rx)
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200608{
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200609 int index, j;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200610
Johannes Bergdd318572010-11-29 11:09:16 +0100611 lockdep_assert_held(&tid_agg_rx->reorder_lock);
612
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200613 /* release the buffer until next missing frame */
614 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
615 tid_agg_rx->buf_size;
616 if (!tid_agg_rx->reorder_buf[index] &&
Eliad Peller07ae2df2012-02-01 18:48:09 +0200617 tid_agg_rx->stored_mpdu_num) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200618 /*
619 * No buffers ready to be released, but check whether any
620 * frames in the reorder buffer have timed out.
621 */
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200622 int skipped = 1;
623 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
624 j = (j + 1) % tid_agg_rx->buf_size) {
625 if (!tid_agg_rx->reorder_buf[j]) {
626 skipped++;
627 continue;
628 }
Daniel Halperin499fe9a2011-03-24 16:01:48 -0700629 if (skipped &&
630 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200631 HT_RX_REORDER_BUF_TIMEOUT))
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200632 goto set_release_timer;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200633
634#ifdef CONFIG_MAC80211_HT_DEBUG
635 if (net_ratelimit())
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700636 wiphy_debug(hw->wiphy,
637 "release an RX reorder frame due to timeout on earlier frames\n");
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200638#endif
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100639 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200640
641 /*
642 * Increment the head seq# also for the skipped slots.
643 */
644 tid_agg_rx->head_seq_num =
645 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
646 skipped = 0;
647 }
648 } else while (tid_agg_rx->reorder_buf[index]) {
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100649 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200650 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
651 tid_agg_rx->buf_size;
652 }
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200653
654 if (tid_agg_rx->stored_mpdu_num) {
655 j = index = seq_sub(tid_agg_rx->head_seq_num,
656 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
657
658 for (; j != (index - 1) % tid_agg_rx->buf_size;
659 j = (j + 1) % tid_agg_rx->buf_size) {
660 if (tid_agg_rx->reorder_buf[j])
661 break;
662 }
663
664 set_release_timer:
665
666 mod_timer(&tid_agg_rx->reorder_timer,
Christian Lamparter334df732011-04-24 20:41:16 +0200667 tid_agg_rx->reorder_time[j] + 1 +
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200668 HT_RX_REORDER_BUF_TIMEOUT);
669 } else {
670 del_timer(&tid_agg_rx->reorder_timer);
671 }
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200672}
673
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100674/*
675 * As this function belongs to the RX path it must be under
676 * rcu_read_lock protection. It returns false if the frame
677 * can be processed immediately, true if it was consumed.
678 */
679static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
680 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100681 struct sk_buff *skb)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100682{
683 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
684 u16 sc = le16_to_cpu(hdr->seq_ctrl);
685 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
686 u16 head_seq_num, buf_size;
687 int index;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200688 bool ret = true;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100689
Johannes Bergdd318572010-11-29 11:09:16 +0100690 spin_lock(&tid_agg_rx->reorder_lock);
691
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100692 buf_size = tid_agg_rx->buf_size;
693 head_seq_num = tid_agg_rx->head_seq_num;
694
695 /* frame with out of date sequence number */
696 if (seq_less(mpdu_seq_num, head_seq_num)) {
697 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200698 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100699 }
700
701 /*
702 * If frame the sequence number exceeds our buffering window
703 * size release some previous frames to make room for this one.
704 */
705 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
706 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
707 /* release stored frames up to new head to stack */
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100708 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100709 }
710
711 /* Now the new frame is always in the range of the reordering buffer */
712
713 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
714
715 /* check if we already stored this frame */
716 if (tid_agg_rx->reorder_buf[index]) {
717 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200718 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100719 }
720
721 /*
722 * If the current MPDU is in the right order and nothing else
723 * is stored we can process it directly, no need to buffer it.
Johannes Bergc835b212011-03-15 23:17:01 +0100724 * If it is first but there's something stored, we may be able
725 * to release frames after this one.
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100726 */
727 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
728 tid_agg_rx->stored_mpdu_num == 0) {
729 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200730 ret = false;
731 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100732 }
733
734 /* put the frame in the reordering buffer */
735 tid_agg_rx->reorder_buf[index] = skb;
736 tid_agg_rx->reorder_time[index] = jiffies;
737 tid_agg_rx->stored_mpdu_num++;
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100738 ieee80211_sta_reorder_release(hw, tid_agg_rx);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100739
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200740 out:
741 spin_unlock(&tid_agg_rx->reorder_lock);
742 return ret;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100743}
744
745/*
746 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
747 * true if the MPDU was buffered, false if it should be processed.
748 */
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100749static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100750{
Johannes Berg2569a822009-11-25 17:46:17 +0100751 struct sk_buff *skb = rx->skb;
752 struct ieee80211_local *local = rx->local;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100753 struct ieee80211_hw *hw = &local->hw;
754 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Thomas Pedersen660c6a42011-11-03 21:11:12 -0700755 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg2569a822009-11-25 17:46:17 +0100756 struct sta_info *sta = rx->sta;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100757 struct tid_ampdu_rx *tid_agg_rx;
758 u16 sc;
Thomas Pedersen6cc00d52011-11-03 21:11:11 -0700759 u8 tid, ack_policy;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100760
761 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg2569a822009-11-25 17:46:17 +0100762 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100763
764 /*
765 * filter the QoS data rx stream according to
766 * STA/TID and check if this STA/TID is on aggregation
767 */
768
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100769 if (!sta)
Johannes Berg2569a822009-11-25 17:46:17 +0100770 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100771
Thomas Pedersen6cc00d52011-11-03 21:11:11 -0700772 ack_policy = *ieee80211_get_qos_ctl(hdr) &
773 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100774 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
775
Johannes Berga87f7362010-06-10 10:21:38 +0200776 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
777 if (!tid_agg_rx)
778 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100779
780 /* qos null data frames are excluded */
781 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Johannes Berga87f7362010-06-10 10:21:38 +0200782 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100783
Thomas Pedersen6cc00d52011-11-03 21:11:11 -0700784 /* not part of a BA session */
785 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
786 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
787 goto dont_reorder;
788
Thomas Pedersen660c6a42011-11-03 21:11:12 -0700789 /* not actually part of this BA session */
790 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
791 goto dont_reorder;
792
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100793 /* new, potentially un-ordered, ampdu frame - process it */
794
795 /* reset session timer */
796 if (tid_agg_rx->timeout)
797 mod_timer(&tid_agg_rx->session_timer,
798 TU_TO_EXP_TIME(tid_agg_rx->timeout));
799
800 /* if this mpdu is fragmented - terminate rx aggregation session */
801 sc = le16_to_cpu(hdr->seq_ctrl);
802 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Bergc1475ca2010-06-10 10:21:37 +0200803 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg344eec62010-06-10 10:21:36 +0200804 skb_queue_tail(&rx->sdata->skb_queue, skb);
805 ieee80211_queue_work(&local->hw, &rx->sdata->work);
Johannes Berg2569a822009-11-25 17:46:17 +0100806 return;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100807 }
808
Johannes Berga87f7362010-06-10 10:21:38 +0200809 /*
810 * No locking needed -- we will only ever process one
811 * RX packet at a time, and thus own tid_agg_rx. All
812 * other code manipulating it needs to (and does) make
813 * sure that we cannot get to it any more before doing
814 * anything with it.
815 */
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100816 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
Johannes Berg2569a822009-11-25 17:46:17 +0100817 return;
818
819 dont_reorder:
Christian Lamparter24a8fda2010-12-30 17:25:29 +0100820 skb_queue_tail(&local->rx_skb_queue, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100821}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100822
Johannes Berg49461622008-06-30 15:10:45 +0200823static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100824ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200825{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700826 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +0200827 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200828
829 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
830 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700831 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
Johannes Berg9e262972011-07-07 18:45:03 +0200832 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
Johannes Berg571ecf62007-07-27 15:43:22 +0200833 hdr->seq_ctrl)) {
Johannes Berg554891e2010-09-24 12:38:25 +0200834 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200835 rx->local->dot11FrameDuplicateCount++;
836 rx->sta->num_duplicates++;
837 }
Felix Fietkaub1f93312011-02-04 19:20:08 +0100838 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200839 } else
Johannes Berg9e262972011-07-07 18:45:03 +0200840 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +0200841 }
842
Johannes Berg571ecf62007-07-27 15:43:22 +0200843 if (unlikely(rx->skb->len < 16)) {
844 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100845 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200846 }
847
Johannes Berg571ecf62007-07-27 15:43:22 +0200848 /* Drop disallowed frame classes based on STA auth/assoc state;
849 * IEEE 802.11, Chap 5.5.
850 *
Johannes Bergccd7b362008-09-11 00:01:56 +0200851 * mac80211 filters only based on association state, i.e. it drops
852 * Class 3 frames from not associated stations. hostapd sends
Johannes Berg571ecf62007-07-27 15:43:22 +0200853 * deauth/disassoc frames when needed. In addition, hostapd is
854 * responsible for filtering on both auth and assoc states.
855 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100856
Johannes Berg902acc72008-02-23 15:17:19 +0100857 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100858 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100859
Harvey Harrisona7767f92008-07-02 16:30:51 -0700860 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
861 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200862 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Bill Jordan1be7fe82010-10-01 11:20:41 -0400863 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200864 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
Johannes Berg7852e362012-01-20 13:55:24 +0100865 /*
866 * accept port control frames from the AP even when it's not
867 * yet marked ASSOC to prevent a race where we don't set the
868 * assoc bit quickly enough before it sends the first frame
869 */
870 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
Guy Eilam2a33bee2011-08-17 15:18:15 +0300871 ieee80211_is_data_present(hdr->frame_control)) {
872 u16 ethertype;
873 u8 *payload;
874
875 payload = rx->skb->data +
876 ieee80211_hdrlen(hdr->frame_control);
877 ethertype = (payload[6] << 8) | payload[7];
878 if (cpu_to_be16(ethertype) ==
879 rx->sdata->control_port_protocol)
880 return RX_CONTINUE;
881 }
Johannes Berg21fc7562011-11-04 11:18:13 +0100882
883 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
884 cfg80211_rx_spurious_frame(rx->sdata->dev,
885 hdr->addr2,
886 GFP_ATOMIC))
887 return RX_DROP_UNUSABLE;
888
Johannes Berge4c26ad2008-01-31 19:48:21 +0100889 return RX_DROP_MONITOR;
Guy Eilam2a33bee2011-08-17 15:18:15 +0300890 }
Johannes Berg571ecf62007-07-27 15:43:22 +0200891
Johannes Berg9ae54c82008-01-31 19:48:20 +0100892 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +0200893}
894
895
Johannes Berg49461622008-06-30 15:10:45 +0200896static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100897ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
Johannes Berg570bd532007-07-27 15:43:22 +0200898{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100899 struct sk_buff *skb = rx->skb;
900 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
901 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg3017b802007-08-28 17:01:53 -0400902 int keyidx;
903 int hdrlen;
Johannes Berge4c26ad2008-01-31 19:48:21 +0100904 ieee80211_rx_result result = RX_DROP_UNUSABLE;
Johannes Berge31b8212010-10-05 19:39:30 +0200905 struct ieee80211_key *sta_ptk = NULL;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200906 int mmie_keyidx = -1;
Johannes Berg761ab472010-05-28 14:24:19 +0200907 __le16 fc;
Johannes Berg570bd532007-07-27 15:43:22 +0200908
Johannes Berg3017b802007-08-28 17:01:53 -0400909 /*
910 * Key selection 101
911 *
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200912 * There are four types of keys:
Johannes Berg3017b802007-08-28 17:01:53 -0400913 * - GTK (group keys)
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200914 * - IGTK (group keys for management frames)
Johannes Berg3017b802007-08-28 17:01:53 -0400915 * - PTK (pairwise keys)
916 * - STK (station-to-station pairwise keys)
917 *
918 * When selecting a key, we have to distinguish between multicast
919 * (including broadcast) and unicast frames, the latter can only
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200920 * use PTKs and STKs while the former always use GTKs and IGTKs.
921 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
922 * unicast frames can also use key indices like GTKs. Hence, if we
923 * don't have a PTK/STK we check the key index for a WEP key.
Johannes Berg3017b802007-08-28 17:01:53 -0400924 *
Johannes Berg8dc06a12007-08-28 17:01:55 -0400925 * Note that in a regular BSS, multicast frames are sent by the
926 * AP only, associated stations unicast the frame to the AP first
927 * which then multicasts it on their behalf.
928 *
Johannes Berg3017b802007-08-28 17:01:53 -0400929 * There is also a slight problem in IBSS mode: GTKs are negotiated
930 * with each station, that is something we don't currently handle.
Johannes Berg8dc06a12007-08-28 17:01:55 -0400931 * The spec seems to expect that one negotiates the same key with
932 * every station but there's no such requirement; VLANs could be
933 * possible.
Johannes Berg3017b802007-08-28 17:01:53 -0400934 */
Johannes Berg571ecf62007-07-27 15:43:22 +0200935
Johannes Berg3017b802007-08-28 17:01:53 -0400936 /*
Johannes Berg1990af82007-09-26 17:53:15 +0200937 * No point in finding a key and decrypting if the frame is neither
Johannes Berg3017b802007-08-28 17:01:53 -0400938 * addressed to us nor a multicast frame.
939 */
Johannes Berg554891e2010-09-24 12:38:25 +0200940 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100941 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -0400942
Johannes Berg2569a822009-11-25 17:46:17 +0100943 /* start without a key */
944 rx->key = NULL;
945
Johannes Bergd4e46a32007-09-14 11:10:24 -0400946 if (rx->sta)
Johannes Berge31b8212010-10-05 19:39:30 +0200947 sta_ptk = rcu_dereference(rx->sta->ptk);
Johannes Bergd4e46a32007-09-14 11:10:24 -0400948
Johannes Berg761ab472010-05-28 14:24:19 +0200949 fc = hdr->frame_control;
950
951 if (!ieee80211_has_protected(fc))
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300952 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
953
Johannes Berge31b8212010-10-05 19:39:30 +0200954 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
955 rx->key = sta_ptk;
Johannes Bergdc1580d2010-08-10 09:46:40 +0200956 if ((status->flag & RX_FLAG_DECRYPTED) &&
957 (status->flag & RX_FLAG_IV_STRIPPED))
958 return RX_CONTINUE;
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300959 /* Skip decryption if the frame is not protected. */
Johannes Berg761ab472010-05-28 14:24:19 +0200960 if (!ieee80211_has_protected(fc))
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300961 return RX_CONTINUE;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200962 } else if (mmie_keyidx >= 0) {
963 /* Broadcast/multicast robust management frame / BIP */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100964 if ((status->flag & RX_FLAG_DECRYPTED) &&
965 (status->flag & RX_FLAG_IV_STRIPPED))
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200966 return RX_CONTINUE;
967
968 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
969 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
970 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
Johannes Berge31b8212010-10-05 19:39:30 +0200971 if (rx->sta)
972 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
973 if (!rx->key)
974 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
Johannes Berg761ab472010-05-28 14:24:19 +0200975 } else if (!ieee80211_has_protected(fc)) {
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300976 /*
977 * The frame was not protected, so skip decryption. However, we
978 * need to set rx->key if there is a key that could have been
979 * used so that the frame may be dropped if encryption would
980 * have been expected.
981 */
982 struct ieee80211_key *key = NULL;
Johannes Berg897bed82010-12-09 19:49:00 +0100983 struct ieee80211_sub_if_data *sdata = rx->sdata;
984 int i;
985
Johannes Berg761ab472010-05-28 14:24:19 +0200986 if (ieee80211_is_mgmt(fc) &&
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300987 is_multicast_ether_addr(hdr->addr1) &&
988 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
989 rx->key = key;
Johannes Berg897bed82010-12-09 19:49:00 +0100990 else {
991 if (rx->sta) {
992 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
993 key = rcu_dereference(rx->sta->gtk[i]);
994 if (key)
995 break;
996 }
997 }
998 if (!key) {
999 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1000 key = rcu_dereference(sdata->keys[i]);
1001 if (key)
1002 break;
1003 }
1004 }
1005 if (key)
1006 rx->key = key;
1007 }
Jouni Malinen0c7c10c2009-05-08 12:34:10 +03001008 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001009 } else {
Zhu Yi39184b12010-04-08 15:35:10 +08001010 u8 keyid;
Johannes Berg3017b802007-08-28 17:01:53 -04001011 /*
1012 * The device doesn't give us the IV so we won't be
1013 * able to look up the key. That's ok though, we
1014 * don't need to decrypt the frame, we just won't
1015 * be able to keep statistics accurate.
1016 * Except for key threshold notifications, should
1017 * we somehow allow the driver to tell us which key
1018 * the hardware used if this flag is set?
1019 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001020 if ((status->flag & RX_FLAG_DECRYPTED) &&
1021 (status->flag & RX_FLAG_IV_STRIPPED))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001022 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001023
Johannes Berg761ab472010-05-28 14:24:19 +02001024 hdrlen = ieee80211_hdrlen(fc);
Johannes Berg571ecf62007-07-27 15:43:22 +02001025
Johannes Berg3017b802007-08-28 17:01:53 -04001026 if (rx->skb->len < 8 + hdrlen)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001027 return RX_DROP_UNUSABLE; /* TODO: count this? */
Johannes Berg571ecf62007-07-27 15:43:22 +02001028
Johannes Berg3017b802007-08-28 17:01:53 -04001029 /*
1030 * no need to call ieee80211_wep_get_keyidx,
1031 * it verifies a bunch of things we've done already
1032 */
Zhu Yi39184b12010-04-08 15:35:10 +08001033 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1034 keyidx = keyid >> 6;
Johannes Berg3017b802007-08-28 17:01:53 -04001035
Johannes Berge31b8212010-10-05 19:39:30 +02001036 /* check per-station GTK first, if multicast packet */
1037 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1038 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
Johannes Berg3017b802007-08-28 17:01:53 -04001039
Johannes Berge31b8212010-10-05 19:39:30 +02001040 /* if not found, try default key */
1041 if (!rx->key) {
1042 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1043
1044 /*
1045 * RSNA-protected unicast frames should always be
1046 * sent with pairwise or station-to-station keys,
1047 * but for WEP we allow using a key index as well.
1048 */
1049 if (rx->key &&
1050 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1051 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1052 !is_multicast_ether_addr(hdr->addr1))
1053 rx->key = NULL;
1054 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001055 }
1056
Johannes Berg3017b802007-08-28 17:01:53 -04001057 if (rx->key) {
Johannes Berg95acac62011-07-12 12:30:59 +02001058 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1059 return RX_DROP_MONITOR;
1060
Johannes Berg571ecf62007-07-27 15:43:22 +02001061 rx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -04001062 /* TODO: add threshold stuff again */
Johannes Berg1990af82007-09-26 17:53:15 +02001063 } else {
Johannes Berge4c26ad2008-01-31 19:48:21 +01001064 return RX_DROP_MONITOR;
Johannes Berg70f08762007-09-26 17:53:14 +02001065 }
1066
Johannes Berg97359d12010-08-10 09:46:38 +02001067 switch (rx->key->conf.cipher) {
1068 case WLAN_CIPHER_SUITE_WEP40:
1069 case WLAN_CIPHER_SUITE_WEP104:
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001070 result = ieee80211_crypto_wep_decrypt(rx);
1071 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001072 case WLAN_CIPHER_SUITE_TKIP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001073 result = ieee80211_crypto_tkip_decrypt(rx);
1074 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001075 case WLAN_CIPHER_SUITE_CCMP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001076 result = ieee80211_crypto_ccmp_decrypt(rx);
1077 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001078 case WLAN_CIPHER_SUITE_AES_CMAC:
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +02001079 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1080 break;
Johannes Berg3ffc2a92010-08-27 14:26:52 +03001081 default:
1082 /*
1083 * We can reach here only with HW-only algorithms
1084 * but why didn't it decrypt the frame?!
1085 */
1086 return RX_DROP_UNUSABLE;
Johannes Berg70f08762007-09-26 17:53:14 +02001087 }
1088
Johannes Berga8286912012-03-12 13:49:14 +01001089 /* the hdr variable is invalid after the decrypt handlers */
1090
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001091 /* either the frame has been decrypted or will be dropped */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001092 status->flag |= RX_FLAG_DECRYPTED;
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001093
1094 return result;
Johannes Berg70f08762007-09-26 17:53:14 +02001095}
1096
Kalle Valo572e0012009-02-10 17:09:31 +02001097static ieee80211_rx_result debug_noinline
1098ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1099{
1100 struct ieee80211_local *local;
1101 struct ieee80211_hdr *hdr;
1102 struct sk_buff *skb;
1103
1104 local = rx->local;
1105 skb = rx->skb;
1106 hdr = (struct ieee80211_hdr *) skb->data;
1107
1108 if (!local->pspolling)
1109 return RX_CONTINUE;
1110
1111 if (!ieee80211_has_fromds(hdr->frame_control))
1112 /* this is not from AP */
1113 return RX_CONTINUE;
1114
1115 if (!ieee80211_is_data(hdr->frame_control))
1116 return RX_CONTINUE;
1117
1118 if (!ieee80211_has_moredata(hdr->frame_control)) {
1119 /* AP has no more frames buffered for us */
1120 local->pspolling = false;
1121 return RX_CONTINUE;
1122 }
1123
1124 /* more data bit is set, let's request a new frame from the AP */
1125 ieee80211_send_pspoll(local, rx->sdata);
1126
1127 return RX_CONTINUE;
1128}
1129
Johannes Berg133b8222008-09-16 14:18:59 +02001130static void ap_sta_ps_start(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001131{
Johannes Berg133b8222008-09-16 14:18:59 +02001132 struct ieee80211_sub_if_data *sdata = sta->sdata;
Christian Lamparter4571d3b2008-11-30 00:48:41 +01001133 struct ieee80211_local *local = sdata->local;
Joe Perches0795af52007-10-03 17:59:30 -07001134
Johannes Berg3e122be2008-07-09 14:40:34 +02001135 atomic_inc(&sdata->bss->num_sta_ps);
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001136 set_sta_flag(sta, WLAN_STA_PS_STA);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001137 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1138 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001139#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001140 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001141 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001142#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1143}
1144
Johannes Bergff9458d2009-10-30 12:56:02 +01001145static void ap_sta_ps_end(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001146{
Johannes Berg571ecf62007-07-27 15:43:22 +02001147#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001148 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
Helmut Schaa608383b2012-01-30 15:18:00 +01001149 sta->sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001150#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg004c8722008-02-20 11:21:35 +01001151
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001152 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001153#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Bergaf818582009-11-06 11:35:50 +01001154 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
Helmut Schaa608383b2012-01-30 15:18:00 +01001155 sta->sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001156#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Bergaf818582009-11-06 11:35:50 +01001157 return;
1158 }
1159
1160 ieee80211_sta_ps_deliver_wakeup(sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001161}
1162
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001163int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1164{
1165 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1166 bool in_ps;
1167
1168 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1169
1170 /* Don't let the same PS state be set twice */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001171 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001172 if ((start && in_ps) || (!start && !in_ps))
1173 return -EINVAL;
1174
1175 if (start)
1176 ap_sta_ps_start(sta_inf);
1177 else
1178 ap_sta_ps_end(sta_inf);
1179
1180 return 0;
1181}
1182EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1183
Johannes Berg49461622008-06-30 15:10:45 +02001184static ieee80211_rx_result debug_noinline
Johannes Berg47086fc2011-09-29 16:04:33 +02001185ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1186{
1187 struct ieee80211_sub_if_data *sdata = rx->sdata;
1188 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1189 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1190 int tid, ac;
1191
1192 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1193 return RX_CONTINUE;
1194
1195 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1196 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1197 return RX_CONTINUE;
1198
1199 /*
1200 * The device handles station powersave, so don't do anything about
1201 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1202 * it to mac80211 since they're handled.)
1203 */
1204 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1205 return RX_CONTINUE;
1206
1207 /*
1208 * Don't do anything if the station isn't already asleep. In
1209 * the uAPSD case, the station will probably be marked asleep,
1210 * in the PS-Poll case the station must be confused ...
1211 */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001212 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
Johannes Berg47086fc2011-09-29 16:04:33 +02001213 return RX_CONTINUE;
1214
1215 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001216 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1217 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
Johannes Bergdeeaee12011-09-29 16:04:35 +02001218 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1219 else
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001220 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
Johannes Bergdeeaee12011-09-29 16:04:35 +02001221 }
Johannes Berg47086fc2011-09-29 16:04:33 +02001222
1223 /* Free PS Poll skb here instead of returning RX_DROP that would
1224 * count as an dropped frame. */
1225 dev_kfree_skb(rx->skb);
1226
1227 return RX_QUEUED;
1228 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1229 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1230 ieee80211_has_pm(hdr->frame_control) &&
1231 (ieee80211_is_data_qos(hdr->frame_control) ||
1232 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1233 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1234 ac = ieee802_1d_to_ac[tid & 7];
1235
1236 /*
1237 * If this AC is not trigger-enabled do nothing.
1238 *
1239 * NB: This could/should check a separate bitmap of trigger-
1240 * enabled queues, but for now we only implement uAPSD w/o
1241 * TSPEC changes to the ACs, so they're always the same.
1242 */
1243 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1244 return RX_CONTINUE;
1245
1246 /* if we are in a service period, do nothing */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001247 if (test_sta_flag(rx->sta, WLAN_STA_SP))
Johannes Berg47086fc2011-09-29 16:04:33 +02001248 return RX_CONTINUE;
1249
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001250 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
Johannes Berg47086fc2011-09-29 16:04:33 +02001251 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1252 else
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001253 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
Johannes Berg47086fc2011-09-29 16:04:33 +02001254 }
1255
1256 return RX_CONTINUE;
1257}
1258
1259static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001260ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001261{
1262 struct sta_info *sta = rx->sta;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001263 struct sk_buff *skb = rx->skb;
1264 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1265 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001266
1267 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001268 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001269
Johannes Bergb291ba12009-07-10 15:29:03 +02001270 /*
1271 * Update last_rx only for IBSS packets which are for the current
1272 * BSSID to avoid keeping the current IBSS network alive in cases
1273 * where other STAs start using different BSSID.
1274 */
Johannes Berg05c914f2008-09-11 00:01:58 +02001275 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001276 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +02001277 NL80211_IFTYPE_ADHOC);
Felix Fietkau3af63342011-02-27 22:08:01 +01001278 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001279 sta->last_rx = jiffies;
Felix Fietkau3af63342011-02-27 22:08:01 +01001280 if (ieee80211_is_data(hdr->frame_control)) {
1281 sta->last_rx_rate_idx = status->rate_idx;
1282 sta->last_rx_rate_flag = status->flag;
1283 }
1284 }
Johannes Bergb291ba12009-07-10 15:29:03 +02001285 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1286 /*
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001287 * Mesh beacons will update last_rx when if they are found to
1288 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +02001289 */
Johannes Bergb291ba12009-07-10 15:29:03 +02001290 sta->last_rx = jiffies;
Felix Fietkau3af63342011-02-27 22:08:01 +01001291 if (ieee80211_is_data(hdr->frame_control)) {
1292 sta->last_rx_rate_idx = status->rate_idx;
1293 sta->last_rx_rate_flag = status->flag;
1294 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001295 }
1296
Johannes Berg554891e2010-09-24 12:38:25 +02001297 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001298 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001299
Kalle Valo3cf335d2009-03-22 21:57:06 +02001300 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1301 ieee80211_sta_rx_notify(rx->sdata, hdr);
1302
Johannes Berg571ecf62007-07-27 15:43:22 +02001303 sta->rx_fragments++;
1304 sta->rx_bytes += rx->skb->len;
Felix Fietkaufe8431f2012-03-01 18:00:07 +01001305 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1306 sta->last_signal = status->signal;
1307 ewma_add(&sta->avg_signal, -status->signal);
1308 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001309
Johannes Berg72eaa432008-11-26 15:02:58 +01001310 /*
1311 * Change STA power saving mode only at the end of a frame
1312 * exchange sequence.
1313 */
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001314 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1315 !ieee80211_has_morefrags(hdr->frame_control) &&
Christian Lamparter4cfda472010-12-27 23:21:26 +01001316 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001317 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1318 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001319 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
Johannes Berg72eaa432008-11-26 15:02:58 +01001320 /*
1321 * Ignore doze->wake transitions that are
1322 * indicated by non-data frames, the standard
1323 * is unclear here, but for example going to
1324 * PS mode and then scanning would cause a
1325 * doze->wake transition for the probe request,
1326 * and that is clearly undesirable.
1327 */
1328 if (ieee80211_is_data(hdr->frame_control) &&
1329 !ieee80211_has_pm(hdr->frame_control))
Johannes Bergff9458d2009-10-30 12:56:02 +01001330 ap_sta_ps_end(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001331 } else {
1332 if (ieee80211_has_pm(hdr->frame_control))
1333 ap_sta_ps_start(sta);
1334 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001335 }
1336
Johannes Berg22403de2009-10-30 12:55:03 +01001337 /*
1338 * Drop (qos-)data::nullfunc frames silently, since they
1339 * are used only to control station power saving mode.
1340 */
1341 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1342 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001343 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
Felix Fietkaud5242152010-01-08 18:06:26 +01001344
1345 /*
1346 * If we receive a 4-addr nullfunc frame from a STA
Johannes Berge7f4a942011-11-04 11:18:20 +01001347 * that was not moved to a 4-addr STA vlan yet send
1348 * the event to userspace and for older hostapd drop
1349 * the frame to the monitor interface.
Felix Fietkaud5242152010-01-08 18:06:26 +01001350 */
1351 if (ieee80211_has_a4(hdr->frame_control) &&
1352 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1353 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
Johannes Berge7f4a942011-11-04 11:18:20 +01001354 !rx->sdata->u.vlan.sta))) {
1355 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1356 cfg80211_rx_unexpected_4addr_frame(
1357 rx->sdata->dev, sta->sta.addr,
1358 GFP_ATOMIC);
Felix Fietkaud5242152010-01-08 18:06:26 +01001359 return RX_DROP_MONITOR;
Johannes Berge7f4a942011-11-04 11:18:20 +01001360 }
Johannes Berg22403de2009-10-30 12:55:03 +01001361 /*
1362 * Update counter and free packet here to avoid
1363 * counting this as a dropped packed.
1364 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001365 sta->rx_packets++;
1366 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001367 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001368 }
1369
Johannes Berg9ae54c82008-01-31 19:48:20 +01001370 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001371} /* ieee80211_rx_h_sta_process */
1372
Johannes Berg571ecf62007-07-27 15:43:22 +02001373static inline struct ieee80211_fragment_entry *
1374ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1375 unsigned int frag, unsigned int seq, int rx_queue,
1376 struct sk_buff **skb)
1377{
1378 struct ieee80211_fragment_entry *entry;
1379 int idx;
1380
1381 idx = sdata->fragment_next;
1382 entry = &sdata->fragments[sdata->fragment_next++];
1383 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1384 sdata->fragment_next = 0;
1385
1386 if (!skb_queue_empty(&entry->skb_list)) {
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001387#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg571ecf62007-07-27 15:43:22 +02001388 struct ieee80211_hdr *hdr =
1389 (struct ieee80211_hdr *) entry->skb_list.next->data;
1390 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1391 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
Johannes Berg0c68ae262008-10-27 15:56:10 -07001392 "addr1=%pM addr2=%pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001393 sdata->name, idx,
Johannes Berg571ecf62007-07-27 15:43:22 +02001394 jiffies - entry->first_frag_time, entry->seq,
Johannes Berg0c68ae262008-10-27 15:56:10 -07001395 entry->last_frag, hdr->addr1, hdr->addr2);
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001396#endif
Johannes Berg571ecf62007-07-27 15:43:22 +02001397 __skb_queue_purge(&entry->skb_list);
1398 }
1399
1400 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1401 *skb = NULL;
1402 entry->first_frag_time = jiffies;
1403 entry->seq = seq;
1404 entry->rx_queue = rx_queue;
1405 entry->last_frag = frag;
1406 entry->ccmp = 0;
1407 entry->extra_len = 0;
1408
1409 return entry;
1410}
1411
1412static inline struct ieee80211_fragment_entry *
1413ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001414 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +02001415 int rx_queue, struct ieee80211_hdr *hdr)
1416{
1417 struct ieee80211_fragment_entry *entry;
1418 int i, idx;
1419
1420 idx = sdata->fragment_next;
1421 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1422 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +02001423
1424 idx--;
1425 if (idx < 0)
1426 idx = IEEE80211_FRAGMENT_MAX - 1;
1427
1428 entry = &sdata->fragments[idx];
1429 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1430 entry->rx_queue != rx_queue ||
1431 entry->last_frag + 1 != frag)
1432 continue;
1433
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001434 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001435
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001436 /*
1437 * Check ftype and addresses are equal, else check next fragment
1438 */
1439 if (((hdr->frame_control ^ f_hdr->frame_control) &
1440 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001441 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1442 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1443 continue;
1444
S.Çağlar Onurab466232008-02-14 17:36:47 +02001445 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001446 __skb_queue_purge(&entry->skb_list);
1447 continue;
1448 }
1449 return entry;
1450 }
1451
1452 return NULL;
1453}
1454
Johannes Berg49461622008-06-30 15:10:45 +02001455static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001456ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001457{
1458 struct ieee80211_hdr *hdr;
1459 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001460 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001461 unsigned int frag, seq;
1462 struct ieee80211_fragment_entry *entry;
1463 struct sk_buff *skb;
Johannes Berg554891e2010-09-24 12:38:25 +02001464 struct ieee80211_rx_status *status;
Johannes Berg571ecf62007-07-27 15:43:22 +02001465
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001466 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001467 fc = hdr->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02001468 sc = le16_to_cpu(hdr->seq_ctrl);
1469 frag = sc & IEEE80211_SCTL_FRAG;
1470
Harvey Harrison358c8d92008-07-15 18:44:13 -07001471 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001472 (rx->skb)->len < 24 ||
1473 is_multicast_ether_addr(hdr->addr1))) {
1474 /* not fragmented */
1475 goto out;
1476 }
1477 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1478
Zhu Yie3cf8b32010-03-29 17:35:07 +08001479 if (skb_linearize(rx->skb))
1480 return RX_DROP_UNUSABLE;
1481
Abhijeet Kolekar058897a2010-05-11 11:22:11 -07001482 /*
1483 * skb_linearize() might change the skb->data and
1484 * previously cached variables (in this case, hdr) need to
1485 * be refreshed with the new data.
1486 */
1487 hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001488 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1489
1490 if (frag == 0) {
1491 /* This is the first fragment of a new frame. */
1492 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg9e262972011-07-07 18:45:03 +02001493 rx->seqno_idx, &(rx->skb));
Johannes Berg97359d12010-08-10 09:46:38 +02001494 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
Harvey Harrison358c8d92008-07-15 18:44:13 -07001495 ieee80211_has_protected(fc)) {
Johannes Berg9e262972011-07-07 18:45:03 +02001496 int queue = rx->security_idx;
Johannes Berg571ecf62007-07-27 15:43:22 +02001497 /* Store CCMP PN so that we can verify that the next
1498 * fragment has a sequential PN value. */
1499 entry->ccmp = 1;
1500 memcpy(entry->last_pn,
Jouni Malinen91902522010-06-11 10:27:33 -07001501 rx->key->u.ccmp.rx_pn[queue],
Johannes Berg571ecf62007-07-27 15:43:22 +02001502 CCMP_PN_LEN);
1503 }
Johannes Berg9ae54c82008-01-31 19:48:20 +01001504 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001505 }
1506
1507 /* This is a fragment for a frame that should already be pending in
1508 * fragment cache. Add this fragment to the end of the pending entry.
1509 */
Johannes Berg9e262972011-07-07 18:45:03 +02001510 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1511 rx->seqno_idx, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001512 if (!entry) {
1513 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001514 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001515 }
1516
1517 /* Verify that MPDUs within one MSDU have sequential PN values.
1518 * (IEEE 802.11i, 8.3.3.4.5) */
1519 if (entry->ccmp) {
1520 int i;
1521 u8 pn[CCMP_PN_LEN], *rpn;
Jouni Malinen91902522010-06-11 10:27:33 -07001522 int queue;
Johannes Berg97359d12010-08-10 09:46:38 +02001523 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001524 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001525 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1526 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1527 pn[i]++;
1528 if (pn[i])
1529 break;
1530 }
Johannes Berg9e262972011-07-07 18:45:03 +02001531 queue = rx->security_idx;
Jouni Malinen91902522010-06-11 10:27:33 -07001532 rpn = rx->key->u.ccmp.rx_pn[queue];
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001533 if (memcmp(pn, rpn, CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001534 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001535 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1536 }
1537
Harvey Harrison358c8d92008-07-15 18:44:13 -07001538 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +02001539 __skb_queue_tail(&entry->skb_list, rx->skb);
1540 entry->last_frag = frag;
1541 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001542 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001543 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001544 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001545 }
1546
1547 rx->skb = __skb_dequeue(&entry->skb_list);
1548 if (skb_tailroom(rx->skb) < entry->extra_len) {
1549 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1550 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1551 GFP_ATOMIC))) {
1552 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1553 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001554 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001555 }
1556 }
1557 while ((skb = __skb_dequeue(&entry->skb_list))) {
1558 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1559 dev_kfree_skb(skb);
1560 }
1561
1562 /* Complete frame has been reassembled - process it now */
Johannes Berg554891e2010-09-24 12:38:25 +02001563 status = IEEE80211_SKB_RXCB(rx->skb);
1564 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001565
1566 out:
1567 if (rx->sta)
1568 rx->sta->rx_packets++;
1569 if (is_multicast_ether_addr(hdr->addr1))
1570 rx->local->dot11MulticastReceivedFrameCount++;
1571 else
1572 ieee80211_led_rx(rx->local);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001573 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001574}
1575
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001576static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001577ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001578{
Johannes Berg07346f812008-05-03 01:02:02 +02001579 if (unlikely(!rx->sta ||
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001580 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001581 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001582
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001583 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001584}
1585
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001586static int
Harvey Harrison358c8d92008-07-15 18:44:13 -07001587ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02001588{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001589 struct sk_buff *skb = rx->skb;
1590 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1591
Johannes Berg3017b802007-08-28 17:01:53 -04001592 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001593 * Pass through unencrypted frames if the hardware has
1594 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001595 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001596 if (status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001597 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001598
1599 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001600 if (unlikely(!ieee80211_has_protected(fc) &&
1601 !ieee80211_is_nullfunc(fc) &&
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001602 ieee80211_is_data(fc) &&
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +02001603 (rx->key || rx->sdata->drop_unencrypted)))
1604 return -EACCES;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001605
1606 return 0;
1607}
1608
1609static int
1610ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1611{
1612 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Jouni Malinene3efca02010-03-28 22:31:15 -07001613 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001614 __le16 fc = hdr->frame_control;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001615
Jouni Malinene3efca02010-03-28 22:31:15 -07001616 /*
1617 * Pass through unencrypted frames if the hardware has
1618 * decrypted them already.
1619 */
1620 if (status->flag & RX_FLAG_DECRYPTED)
1621 return 0;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001622
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001623 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
Jouni Malinend211e902010-03-28 22:29:52 -07001624 if (unlikely(!ieee80211_has_protected(fc) &&
1625 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02001626 rx->key)) {
1627 if (ieee80211_is_deauth(fc))
1628 cfg80211_send_unprot_deauth(rx->sdata->dev,
1629 rx->skb->data,
1630 rx->skb->len);
1631 else if (ieee80211_is_disassoc(fc))
1632 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1633 rx->skb->data,
1634 rx->skb->len);
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001635 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02001636 }
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001637 /* BIP does not use Protected field, so need to check MMIE */
Joe Perchesf64f9e72009-11-29 16:55:45 -08001638 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02001639 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1640 if (ieee80211_is_deauth(fc))
1641 cfg80211_send_unprot_deauth(rx->sdata->dev,
1642 rx->skb->data,
1643 rx->skb->len);
1644 else if (ieee80211_is_disassoc(fc))
1645 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1646 rx->skb->data,
1647 rx->skb->len);
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001648 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02001649 }
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001650 /*
1651 * When using MFP, Action frames are not allowed prior to
1652 * having configured keys.
1653 */
1654 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1655 ieee80211_is_robust_mgmt_frame(
1656 (struct ieee80211_hdr *) rx->skb->data)))
1657 return -EACCES;
1658 }
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001659
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001660 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001661}
1662
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001663static int
Felix Fietkau4114fa22011-04-12 19:15:22 +02001664__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
Johannes Berg571ecf62007-07-27 15:43:22 +02001665{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001666 struct ieee80211_sub_if_data *sdata = rx->sdata;
Felix Fietkauf14543e2009-11-10 20:10:05 +01001667 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001668 bool check_port_control = false;
1669 struct ethhdr *ehdr;
1670 int ret;
Felix Fietkauf14543e2009-11-10 20:10:05 +01001671
Felix Fietkau4114fa22011-04-12 19:15:22 +02001672 *port_control = false;
Johannes Berg9bc383d2009-11-19 11:55:19 +01001673 if (ieee80211_has_a4(hdr->frame_control) &&
1674 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
Felix Fietkauf14543e2009-11-10 20:10:05 +01001675 return -1;
Johannes Berg9bc383d2009-11-19 11:55:19 +01001676
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001677 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1678 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1679
1680 if (!sdata->u.mgd.use_4addr)
1681 return -1;
1682 else
1683 check_port_control = true;
1684 }
1685
Johannes Berg9bc383d2009-11-19 11:55:19 +01001686 if (is_multicast_ether_addr(hdr->addr1) &&
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001687 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
Felix Fietkauf14543e2009-11-10 20:10:05 +01001688 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001689
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001690 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
Felix Fietkau4114fa22011-04-12 19:15:22 +02001691 if (ret < 0)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001692 return ret;
1693
1694 ehdr = (struct ethhdr *) rx->skb->data;
Felix Fietkau4114fa22011-04-12 19:15:22 +02001695 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1696 *port_control = true;
1697 else if (check_port_control)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01001698 return -1;
1699
1700 return 0;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001701}
Johannes Berg571ecf62007-07-27 15:43:22 +02001702
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001703/*
1704 * requires that rx->skb is a frame with ethernet header
1705 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001706static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001707{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301708 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001709 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1710 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1711
1712 /*
1713 * Allow EAPOL frames to us/the PAE group address regardless
1714 * of whether the frame was encrypted or not.
1715 */
Johannes Berga621fa42010-08-27 14:26:54 +03001716 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
Johannes Berg47846c92009-11-25 17:46:19 +01001717 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001718 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1719 return true;
1720
1721 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07001722 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001723 return false;
1724
1725 return true;
1726}
1727
1728/*
1729 * requires that rx->skb is a frame with ethernet header
1730 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001731static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01001732ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001733{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001734 struct ieee80211_sub_if_data *sdata = rx->sdata;
1735 struct net_device *dev = sdata->dev;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001736 struct sk_buff *skb, *xmit_skb;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001737 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1738 struct sta_info *dsta;
Johannes Berg554891e2010-09-24 12:38:25 +02001739 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001740
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001741 skb = rx->skb;
1742 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001743
Johannes Berg05c914f2008-09-11 00:01:58 +02001744 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1745 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02001746 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg554891e2010-09-24 12:38:25 +02001747 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
Johannes Berg9bc383d2009-11-19 11:55:19 +01001748 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001749 if (is_multicast_ether_addr(ehdr->h_dest)) {
1750 /*
1751 * send multicast frames both to higher layers in
1752 * local net stack and back to the wireless medium
1753 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001754 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1755 if (!xmit_skb && net_ratelimit())
Johannes Berg571ecf62007-07-27 15:43:22 +02001756 printk(KERN_DEBUG "%s: failed to clone "
1757 "multicast frame\n", dev->name);
1758 } else {
Johannes Bergabe60632009-11-25 17:46:18 +01001759 dsta = sta_info_get(sdata, skb->data);
1760 if (dsta) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001761 /*
1762 * The destination station is associated to
1763 * this AP (in this VLAN), so send the frame
1764 * directly to it and do not pass it to local
1765 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02001766 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001767 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001768 skb = NULL;
1769 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001770 }
1771 }
1772
1773 if (skb) {
Johannes Bergd1c3a372009-01-07 00:26:10 +01001774 int align __maybe_unused;
1775
Kalle Valo59d9cb02009-12-17 13:54:57 +01001776#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
Johannes Bergd1c3a372009-01-07 00:26:10 +01001777 /*
1778 * 'align' will only take the values 0 or 2 here
1779 * since all frames are required to be aligned
1780 * to 2-byte boundaries when being passed to
1781 * mac80211. That also explains the __skb_push()
1782 * below.
1783 */
matthieu castetdacb6f12009-06-04 22:16:18 +02001784 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01001785 if (align) {
1786 if (WARN_ON(skb_headroom(skb) < 3)) {
1787 dev_kfree_skb(skb);
1788 skb = NULL;
1789 } else {
1790 u8 *data = skb->data;
Zhu Yi8ce0b582009-10-28 13:13:52 -07001791 size_t len = skb_headlen(skb);
1792 skb->data -= align;
1793 memmove(skb->data, data, len);
1794 skb_set_tail_pointer(skb, len);
Johannes Bergd1c3a372009-01-07 00:26:10 +01001795 }
1796 }
1797#endif
1798
1799 if (skb) {
1800 /* deliver to local stack */
1801 skb->protocol = eth_type_trans(skb, dev);
1802 memset(skb->cb, 0, sizeof(skb->cb));
John W. Linville5548a8a2010-06-24 14:25:56 -04001803 netif_receive_skb(skb);
Johannes Bergd1c3a372009-01-07 00:26:10 +01001804 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001805 }
1806
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001807 if (xmit_skb) {
Helmut Schaaaef6c922011-12-21 09:11:35 +01001808 /*
1809 * Send to wireless media and increase priority by 256 to
1810 * keep the received priority instead of reclassifying
1811 * the frame (see cfg80211_classify8021d).
1812 */
1813 xmit_skb->priority += 256;
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09001814 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001815 skb_reset_network_header(xmit_skb);
1816 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001817 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001818 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001819}
1820
Johannes Berg49461622008-06-30 15:10:45 +02001821static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001822ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001823{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001824 struct net_device *dev = rx->sdata->dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001825 struct sk_buff *skb = rx->skb;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001826 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1827 __le16 fc = hdr->frame_control;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001828 struct sk_buff_head frame_list;
Johannes Berg554891e2010-09-24 12:38:25 +02001829 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001830
Harvey Harrison358c8d92008-07-15 18:44:13 -07001831 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001832 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001833
Harvey Harrison358c8d92008-07-15 18:44:13 -07001834 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001835 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001836
Johannes Berg554891e2010-09-24 12:38:25 +02001837 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001838 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001839
Zhu Yieaf85ca2009-12-01 10:18:37 +08001840 if (ieee80211_has_a4(hdr->frame_control) &&
1841 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1842 !rx->sdata->u.vlan.sta)
1843 return RX_DROP_UNUSABLE;
1844
1845 if (is_multicast_ether_addr(hdr->addr1) &&
1846 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1847 rx->sdata->u.vlan.sta) ||
1848 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1849 rx->sdata->u.mgd.use_4addr)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001850 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001851
1852 skb->dev = dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001853 __skb_queue_head_init(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001854
Zhu Yie3cf8b32010-03-29 17:35:07 +08001855 if (skb_linearize(skb))
1856 return RX_DROP_UNUSABLE;
1857
Zhu Yieaf85ca2009-12-01 10:18:37 +08001858 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1859 rx->sdata->vif.type,
Yogesh Ashok Powar8b3beca2011-05-13 11:22:31 -07001860 rx->local->hw.extra_tx_headroom, true);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001861
Zhu Yieaf85ca2009-12-01 10:18:37 +08001862 while (!skb_queue_empty(&frame_list)) {
1863 rx->skb = __skb_dequeue(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001864
Harvey Harrison358c8d92008-07-15 18:44:13 -07001865 if (!ieee80211_frame_allowed(rx, fc)) {
Zhu Yieaf85ca2009-12-01 10:18:37 +08001866 dev_kfree_skb(rx->skb);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001867 continue;
1868 }
Zhu Yieaf85ca2009-12-01 10:18:37 +08001869 dev->stats.rx_packets++;
1870 dev->stats.rx_bytes += rx->skb->len;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001871
1872 ieee80211_deliver_skb(rx);
1873 }
1874
Johannes Berg9ae54c82008-01-31 19:48:20 +01001875 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001876}
1877
Ingo Molnarbf94e172008-10-12 23:51:38 -07001878#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02001879static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001880ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1881{
Thomas Pedersen30789eb2011-11-24 17:15:26 -08001882 struct ieee80211_hdr *fwd_hdr, *hdr;
1883 struct ieee80211_tx_info *info;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001884 struct ieee80211s_hdr *mesh_hdr;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001885 struct sk_buff *skb = rx->skb, *fwd_skb;
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001886 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001887 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02001888 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08001889 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001890 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08001891 u16 q, hdrlen;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001892
1893 hdr = (struct ieee80211_hdr *) skb->data;
1894 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1895 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1896
Thomas Pedersen2157fdd2011-09-01 12:32:14 -07001897 /* frame is in RMC, don't forward */
1898 if (ieee80211_is_data(hdr->frame_control) &&
1899 is_multicast_ether_addr(hdr->addr1) &&
1900 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1901 return RX_DROP_MONITOR;
1902
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001903 if (!ieee80211_is_data(hdr->frame_control))
1904 return RX_CONTINUE;
1905
1906 if (!mesh_hdr->ttl)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001907 return RX_DROP_MONITOR;
1908
Javier Cardona43b7b312009-10-15 18:10:51 -07001909 if (mesh_hdr->flags & MESH_FLAGS_AE) {
YanBo79617de2008-09-22 13:30:32 +08001910 struct mesh_path *mppath;
Javier Cardona43b7b312009-10-15 18:10:51 -07001911 char *proxied_addr;
1912 char *mpp_addr;
1913
1914 if (is_multicast_ether_addr(hdr->addr1)) {
1915 mpp_addr = hdr->addr3;
1916 proxied_addr = mesh_hdr->eaddr1;
1917 } else {
1918 mpp_addr = hdr->addr4;
1919 proxied_addr = mesh_hdr->eaddr2;
1920 }
YanBo79617de2008-09-22 13:30:32 +08001921
YanBo79617de2008-09-22 13:30:32 +08001922 rcu_read_lock();
Javier Cardona43b7b312009-10-15 18:10:51 -07001923 mppath = mpp_path_lookup(proxied_addr, sdata);
YanBo79617de2008-09-22 13:30:32 +08001924 if (!mppath) {
Javier Cardona43b7b312009-10-15 18:10:51 -07001925 mpp_path_add(proxied_addr, mpp_addr, sdata);
YanBo79617de2008-09-22 13:30:32 +08001926 } else {
1927 spin_lock_bh(&mppath->state_lock);
Javier Cardona43b7b312009-10-15 18:10:51 -07001928 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1929 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
YanBo79617de2008-09-22 13:30:32 +08001930 spin_unlock_bh(&mppath->state_lock);
1931 }
1932 rcu_read_unlock();
1933 }
1934
Javier Cardona3c5772a2009-08-10 12:15:48 -07001935 /* Frame has reached destination. Don't forward */
1936 if (!is_multicast_ether_addr(hdr->addr1) &&
Johannes Berg47846c92009-11-25 17:46:19 +01001937 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001938 return RX_CONTINUE;
1939
Thomas Pedersend3c15972011-11-24 17:15:23 -08001940 q = ieee80211_select_queue_80211(local, skb, hdr);
1941 if (ieee80211_queue_stopped(&local->hw, q)) {
Thomas Pedersen30789eb2011-11-24 17:15:26 -08001942 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
Thomas Pedersend3c15972011-11-24 17:15:23 -08001943 return RX_DROP_MONITOR;
1944 }
1945 skb_set_queue_mapping(skb, q);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001946
Thomas Pedersen30789eb2011-11-24 17:15:26 -08001947 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1948 goto out;
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001949
Thomas Pedersen30789eb2011-11-24 17:15:26 -08001950 if (!--mesh_hdr->ttl) {
1951 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1952 return RX_DROP_MONITOR;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001953 }
1954
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +08001955 if (!ifmsh->mshcfg.dot11MeshForwarding)
1956 goto out;
1957
Thomas Pedersen30789eb2011-11-24 17:15:26 -08001958 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1959 if (!fwd_skb) {
1960 if (net_ratelimit())
1961 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1962 sdata->name);
1963 goto out;
1964 }
1965
1966 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1967 info = IEEE80211_SKB_CB(fwd_skb);
1968 memset(info, 0, sizeof(*info));
1969 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1970 info->control.vif = &rx->sdata->vif;
1971 info->control.jiffies = jiffies;
1972 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1973 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1974 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1975 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1976 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1977 } else {
1978 /* unable to resolve next hop */
1979 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1980 0, reason, fwd_hdr->addr2, sdata);
1981 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
Jesper Juhl74b8cc32012-01-14 21:52:17 +01001982 kfree_skb(fwd_skb);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08001983 return RX_DROP_MONITOR;
1984 }
1985
1986 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1987 ieee80211_add_pending_skb(local, fwd_skb);
Johannes Bergb51aff02010-12-22 10:15:07 +01001988 out:
Javier Cardona3c5772a2009-08-10 12:15:48 -07001989 if (is_multicast_ether_addr(hdr->addr1) ||
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001990 sdata->dev->flags & IFF_PROMISC)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001991 return RX_CONTINUE;
1992 else
1993 return RX_DROP_MONITOR;
1994}
Ingo Molnarbf94e172008-10-12 23:51:38 -07001995#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001996
1997static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001998ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001999{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002000 struct ieee80211_sub_if_data *sdata = rx->sdata;
Vivek Natarajane15276a2010-02-08 17:47:01 +05302001 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002002 struct net_device *dev = sdata->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07002003 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2004 __le16 fc = hdr->frame_control;
Felix Fietkau4114fa22011-04-12 19:15:22 +02002005 bool port_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002006 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002007
Harvey Harrison358c8d92008-07-15 18:44:13 -07002008 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002009 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002010
Harvey Harrison358c8d92008-07-15 18:44:13 -07002011 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002012 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002013
Felix Fietkauf14543e2009-11-10 20:10:05 +01002014 /*
Johannes Berge7f4a942011-11-04 11:18:20 +01002015 * Send unexpected-4addr-frame event to hostapd. For older versions,
2016 * also drop the frame to cooked monitor interfaces.
Felix Fietkauf14543e2009-11-10 20:10:05 +01002017 */
2018 if (ieee80211_has_a4(hdr->frame_control) &&
Johannes Berge7f4a942011-11-04 11:18:20 +01002019 sdata->vif.type == NL80211_IFTYPE_AP) {
2020 if (rx->sta &&
2021 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2022 cfg80211_rx_unexpected_4addr_frame(
2023 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
Felix Fietkauf14543e2009-11-10 20:10:05 +01002024 return RX_DROP_MONITOR;
Johannes Berge7f4a942011-11-04 11:18:20 +01002025 }
Felix Fietkauf14543e2009-11-10 20:10:05 +01002026
Felix Fietkau4114fa22011-04-12 19:15:22 +02002027 err = __ieee80211_data_to_8023(rx, &port_control);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002028 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002029 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002030
Harvey Harrison358c8d92008-07-15 18:44:13 -07002031 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002032 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002033
Felix Fietkau4114fa22011-04-12 19:15:22 +02002034 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2035 unlikely(port_control) && sdata->bss) {
2036 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2037 u.ap);
2038 dev = sdata->dev;
2039 rx->sdata = sdata;
2040 }
2041
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002042 rx->skb->dev = dev;
2043
2044 dev->stats.rx_packets++;
2045 dev->stats.rx_bytes += rx->skb->len;
2046
Helmut Schaa08ca9442010-11-30 12:19:34 +01002047 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
Rajkumar Manoharan8c99f692011-02-02 22:57:53 +05302048 !is_multicast_ether_addr(
2049 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2050 (!local->scanning &&
2051 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
Vivek Natarajane15276a2010-02-08 17:47:01 +05302052 mod_timer(&local->dynamic_ps_timer, jiffies +
2053 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2054 }
2055
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002056 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02002057
Johannes Berg9ae54c82008-01-31 19:48:20 +01002058 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002059}
2060
Johannes Berg49461622008-06-30 15:10:45 +02002061static ieee80211_rx_result debug_noinline
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002062ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
Ron Rindjunsky71364712007-12-25 17:00:36 +02002063{
2064 struct ieee80211_local *local = rx->local;
2065 struct ieee80211_hw *hw = &local->hw;
2066 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002067 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002068 struct tid_ampdu_rx *tid_agg_rx;
2069 u16 start_seq_num;
2070 u16 tid;
2071
Harvey Harrisona7767f92008-07-02 16:30:51 -07002072 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002073 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002074
Harvey Harrisona7767f92008-07-02 16:30:51 -07002075 if (ieee80211_is_back_req(bar->frame_control)) {
Johannes Berg8ae59772010-05-30 14:52:58 +02002076 struct {
2077 __le16 control, start_seq_num;
2078 } __packed bar_data;
2079
Ron Rindjunsky71364712007-12-25 17:00:36 +02002080 if (!rx->sta)
Johannes Berga02ae752009-11-16 12:00:40 +01002081 return RX_DROP_MONITOR;
Johannes Berg8ae59772010-05-30 14:52:58 +02002082
2083 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2084 &bar_data, sizeof(bar_data)))
2085 return RX_DROP_MONITOR;
2086
Johannes Berg8ae59772010-05-30 14:52:58 +02002087 tid = le16_to_cpu(bar_data.control) >> 12;
Johannes Berga87f7362010-06-10 10:21:38 +02002088
2089 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2090 if (!tid_agg_rx)
Johannes Berga02ae752009-11-16 12:00:40 +01002091 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002092
Johannes Berg8ae59772010-05-30 14:52:58 +02002093 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002094
2095 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01002096 if (tid_agg_rx->timeout)
2097 mod_timer(&tid_agg_rx->session_timer,
2098 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02002099
Johannes Bergdd318572010-11-29 11:09:16 +01002100 spin_lock(&tid_agg_rx->reorder_lock);
Johannes Berga02ae752009-11-16 12:00:40 +01002101 /* release stored frames up to start of BAR */
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002102 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
Johannes Bergdd318572010-11-29 11:09:16 +01002103 spin_unlock(&tid_agg_rx->reorder_lock);
2104
Johannes Berga02ae752009-11-16 12:00:40 +01002105 kfree_skb(skb);
2106 return RX_QUEUED;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002107 }
2108
Johannes Berg08daeca2010-05-30 14:53:43 +02002109 /*
2110 * After this point, we only want management frames,
2111 * so we can drop all remaining control frames to
2112 * cooked monitor interfaces.
2113 */
2114 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002115}
2116
Jouni Malinenf4f727a2009-01-10 11:46:53 +02002117static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2118 struct ieee80211_mgmt *mgmt,
2119 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02002120{
2121 struct ieee80211_local *local = sdata->local;
2122 struct sk_buff *skb;
2123 struct ieee80211_mgmt *resp;
2124
Johannes Berg47846c92009-11-25 17:46:19 +01002125 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
Jouni Malinenfea14732009-01-08 13:32:06 +02002126 /* Not to own unicast address */
2127 return;
2128 }
2129
Johannes Berg46900292009-02-15 12:44:28 +01002130 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2131 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
Johannes Berg77fdaa12009-07-07 03:45:17 +02002132 /* Not from the current AP or not associated yet. */
Jouni Malinenfea14732009-01-08 13:32:06 +02002133 return;
2134 }
2135
2136 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2137 /* Too short SA Query request frame */
2138 return;
2139 }
2140
2141 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2142 if (skb == NULL)
2143 return;
2144
2145 skb_reserve(skb, local->hw.extra_tx_headroom);
2146 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2147 memset(resp, 0, 24);
2148 memcpy(resp->da, mgmt->sa, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01002149 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01002150 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02002151 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2152 IEEE80211_STYPE_ACTION);
2153 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2154 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2155 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2156 memcpy(resp->u.action.u.sa_query.trans_id,
2157 mgmt->u.action.u.sa_query.trans_id,
2158 WLAN_SA_QUERY_TR_ID_LEN);
2159
Johannes Berg62ae67b2009-11-18 18:42:05 +01002160 ieee80211_tx_skb(sdata, skb);
Jouni Malinenfea14732009-01-08 13:32:06 +02002161}
2162
Johannes Berg49461622008-06-30 15:10:45 +02002163static ieee80211_rx_result debug_noinline
Johannes Berg2e161f72010-08-12 15:38:38 +02002164ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2165{
2166 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002167 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002168
2169 /*
2170 * From here on, look only at management frames.
2171 * Data and control frames are already handled,
2172 * and unknown (reserved) frames are useless.
2173 */
2174 if (rx->skb->len < 24)
2175 return RX_DROP_MONITOR;
2176
2177 if (!ieee80211_is_mgmt(mgmt->frame_control))
2178 return RX_DROP_MONITOR;
2179
Johannes Bergee971922011-11-04 11:18:18 +01002180 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2181 ieee80211_is_beacon(mgmt->frame_control) &&
2182 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
Johannes Berg804483e2012-03-05 22:18:41 +01002183 int sig = 0;
2184
2185 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2186 sig = status->signal;
2187
Johannes Bergee971922011-11-04 11:18:18 +01002188 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2189 rx->skb->data, rx->skb->len,
Johannes Berg804483e2012-03-05 22:18:41 +01002190 status->freq, sig, GFP_ATOMIC);
Johannes Bergee971922011-11-04 11:18:18 +01002191 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2192 }
2193
Johannes Berg554891e2010-09-24 12:38:25 +02002194 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg2e161f72010-08-12 15:38:38 +02002195 return RX_DROP_MONITOR;
2196
2197 if (ieee80211_drop_unencrypted_mgmt(rx))
2198 return RX_DROP_UNUSABLE;
2199
2200 return RX_CONTINUE;
2201}
2202
2203static ieee80211_rx_result debug_noinline
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002204ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2205{
2206 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002207 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002208 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002209 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002210 int len = rx->skb->len;
2211
2212 if (!ieee80211_is_action(mgmt->frame_control))
2213 return RX_CONTINUE;
2214
Jouni Malinen026331c2010-02-15 12:53:10 +02002215 /* drop too small frames */
2216 if (len < IEEE80211_MIN_ACTION_SIZE)
2217 return RX_DROP_UNUSABLE;
2218
2219 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
Johannes Berg84040802010-02-15 12:46:39 +02002220 return RX_DROP_UNUSABLE;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002221
Johannes Berg554891e2010-09-24 12:38:25 +02002222 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg84040802010-02-15 12:46:39 +02002223 return RX_DROP_UNUSABLE;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002224
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002225 switch (mgmt->u.action.category) {
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002226 case WLAN_CATEGORY_HT:
2227 /* reject HT action frames from stations not supporting HT */
2228 if (!rx->sta->sta.ht_cap.ht_supported)
2229 goto invalid;
2230
2231 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2232 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2233 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2234 sdata->vif.type != NL80211_IFTYPE_AP &&
2235 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2236 break;
2237
2238 /* verify action & smps_control are present */
2239 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2240 goto invalid;
2241
2242 switch (mgmt->u.action.u.ht_smps.action) {
2243 case WLAN_HT_ACTION_SMPS: {
2244 struct ieee80211_supported_band *sband;
2245 u8 smps;
2246
2247 /* convert to HT capability */
2248 switch (mgmt->u.action.u.ht_smps.smps_control) {
2249 case WLAN_HT_SMPS_CONTROL_DISABLED:
2250 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2251 break;
2252 case WLAN_HT_SMPS_CONTROL_STATIC:
2253 smps = WLAN_HT_CAP_SM_PS_STATIC;
2254 break;
2255 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2256 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2257 break;
2258 default:
2259 goto invalid;
2260 }
2261 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2262
2263 /* if no change do nothing */
2264 if ((rx->sta->sta.ht_cap.cap &
2265 IEEE80211_HT_CAP_SM_PS) == smps)
2266 goto handled;
2267
2268 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2269 rx->sta->sta.ht_cap.cap |= smps;
2270
2271 sband = rx->local->hw.wiphy->bands[status->band];
2272
Paul Stewart3117bbdb2012-03-13 07:46:18 -07002273 rate_control_rate_update(
2274 local, sband, rx->sta,
2275 IEEE80211_RC_SMPS_CHANGED,
2276 ieee80211_get_tx_channel_type(
2277 local, local->_oper_channel_type));
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002278 goto handled;
2279 }
2280 default:
2281 goto invalid;
2282 }
2283
2284 break;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002285 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01002286 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
Thomas Pedersenae2772b2011-10-26 14:47:29 -07002287 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
Johannes Berg8abd3f92009-02-10 21:25:47 +01002288 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
Alexander Simon13c40c52011-11-30 16:56:34 +01002289 sdata->vif.type != NL80211_IFTYPE_AP &&
2290 sdata->vif.type != NL80211_IFTYPE_ADHOC)
Johannes Berg84040802010-02-15 12:46:39 +02002291 break;
Johannes Berg8abd3f92009-02-10 21:25:47 +01002292
Jouni Malinen026331c2010-02-15 12:53:10 +02002293 /* verify action_code is present */
2294 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2295 break;
2296
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002297 switch (mgmt->u.action.u.addba_req.action_code) {
2298 case WLAN_ACTION_ADDBA_REQ:
2299 if (len < (IEEE80211_MIN_ACTION_SIZE +
2300 sizeof(mgmt->u.action.u.addba_req)))
Johannes Bergbed7ee62010-06-10 10:21:35 +02002301 goto invalid;
2302 break;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002303 case WLAN_ACTION_ADDBA_RESP:
2304 if (len < (IEEE80211_MIN_ACTION_SIZE +
2305 sizeof(mgmt->u.action.u.addba_resp)))
Johannes Bergbed7ee62010-06-10 10:21:35 +02002306 goto invalid;
2307 break;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002308 case WLAN_ACTION_DELBA:
2309 if (len < (IEEE80211_MIN_ACTION_SIZE +
2310 sizeof(mgmt->u.action.u.delba)))
Johannes Bergbed7ee62010-06-10 10:21:35 +02002311 goto invalid;
2312 break;
2313 default:
2314 goto invalid;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002315 }
Johannes Bergbed7ee62010-06-10 10:21:35 +02002316
Johannes Berg8b58ff82010-06-10 10:21:51 +02002317 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002318 case WLAN_CATEGORY_SPECTRUM_MGMT:
2319 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
Johannes Berg84040802010-02-15 12:46:39 +02002320 break;
Johannes Berg46900292009-02-15 12:44:28 +01002321
2322 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002323 break;
Johannes Berg46900292009-02-15 12:44:28 +01002324
Jouni Malinen026331c2010-02-15 12:53:10 +02002325 /* verify action_code is present */
2326 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2327 break;
2328
Johannes Berg39192c02008-09-09 14:49:03 +02002329 switch (mgmt->u.action.u.measurement.action_code) {
2330 case WLAN_ACTION_SPCT_MSR_REQ:
2331 if (len < (IEEE80211_MIN_ACTION_SIZE +
2332 sizeof(mgmt->u.action.u.measurement)))
Johannes Berg84040802010-02-15 12:46:39 +02002333 break;
Johannes Berg39192c02008-09-09 14:49:03 +02002334 ieee80211_process_measurement_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002335 goto handled;
Sujithc481ec92009-01-06 09:28:37 +05302336 case WLAN_ACTION_SPCT_CHL_SWITCH:
2337 if (len < (IEEE80211_MIN_ACTION_SIZE +
2338 sizeof(mgmt->u.action.u.chan_switch)))
Johannes Berg84040802010-02-15 12:46:39 +02002339 break;
Sujithc481ec92009-01-06 09:28:37 +05302340
Johannes Bergcc32abd2009-05-15 11:52:31 +02002341 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002342 break;
Johannes Bergcc32abd2009-05-15 11:52:31 +02002343
Felix Fietkau888d04d2012-03-01 15:22:09 +01002344 if (compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid))
Johannes Berg84040802010-02-15 12:46:39 +02002345 break;
Sujithc481ec92009-01-06 09:28:37 +05302346
Johannes Berg8b58ff82010-06-10 10:21:51 +02002347 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002348 }
2349 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002350 case WLAN_CATEGORY_SA_QUERY:
2351 if (len < (IEEE80211_MIN_ACTION_SIZE +
2352 sizeof(mgmt->u.action.u.sa_query)))
Johannes Berg84040802010-02-15 12:46:39 +02002353 break;
2354
Jouni Malinenfea14732009-01-08 13:32:06 +02002355 switch (mgmt->u.action.u.sa_query.action) {
2356 case WLAN_ACTION_SA_QUERY_REQUEST:
2357 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002358 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002359 ieee80211_process_sa_query_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002360 goto handled;
Jouni Malinenfea14732009-01-08 13:32:06 +02002361 }
2362 break;
Thomas Pedersen8db09852011-08-12 20:01:00 -07002363 case WLAN_CATEGORY_SELF_PROTECTED:
2364 switch (mgmt->u.action.u.self_prot.action_code) {
2365 case WLAN_SP_MESH_PEERING_OPEN:
2366 case WLAN_SP_MESH_PEERING_CLOSE:
2367 case WLAN_SP_MESH_PEERING_CONFIRM:
2368 if (!ieee80211_vif_is_mesh(&sdata->vif))
2369 goto invalid;
2370 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2371 /* userspace handles this frame */
2372 break;
2373 goto queue;
2374 case WLAN_SP_MGK_INFORM:
2375 case WLAN_SP_MGK_ACK:
2376 if (!ieee80211_vif_is_mesh(&sdata->vif))
2377 goto invalid;
2378 break;
2379 }
2380 break;
Javier Cardonad3aaec82011-05-03 16:57:09 -07002381 case WLAN_CATEGORY_MESH_ACTION:
Johannes Berg77a121c2010-06-10 10:21:34 +02002382 if (!ieee80211_vif_is_mesh(&sdata->vif))
2383 break;
Thomas Pedersen25d49e42011-08-11 19:35:15 -07002384 if (mesh_action_is_path_sel(mgmt) &&
2385 (!mesh_path_sel_is_hwmp(sdata)))
Javier Cardonac7108a72010-12-16 17:37:50 -08002386 break;
2387 goto queue;
Johannes Berg84040802010-02-15 12:46:39 +02002388 }
Jouni Malinen026331c2010-02-15 12:53:10 +02002389
Johannes Berg2e161f72010-08-12 15:38:38 +02002390 return RX_CONTINUE;
2391
Johannes Bergbed7ee62010-06-10 10:21:35 +02002392 invalid:
Johannes Berg554891e2010-09-24 12:38:25 +02002393 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
Johannes Berg2e161f72010-08-12 15:38:38 +02002394 /* will return in the next handlers */
2395 return RX_CONTINUE;
2396
2397 handled:
2398 if (rx->sta)
2399 rx->sta->rx_packets++;
2400 dev_kfree_skb(rx->skb);
2401 return RX_QUEUED;
2402
2403 queue:
2404 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2405 skb_queue_tail(&sdata->skb_queue, rx->skb);
2406 ieee80211_queue_work(&local->hw, &sdata->work);
2407 if (rx->sta)
2408 rx->sta->rx_packets++;
2409 return RX_QUEUED;
2410}
2411
2412static ieee80211_rx_result debug_noinline
2413ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2414{
Johannes Berg554891e2010-09-24 12:38:25 +02002415 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg804483e2012-03-05 22:18:41 +01002416 int sig = 0;
Johannes Berg2e161f72010-08-12 15:38:38 +02002417
2418 /* skip known-bad action frames and return them in the next handler */
Johannes Berg554891e2010-09-24 12:38:25 +02002419 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
Johannes Berg2e161f72010-08-12 15:38:38 +02002420 return RX_CONTINUE;
Felix Fietkaud7907442010-01-07 20:23:53 +01002421
Jouni Malinen026331c2010-02-15 12:53:10 +02002422 /*
2423 * Getting here means the kernel doesn't know how to handle
2424 * it, but maybe userspace does ... include returned frames
2425 * so userspace can register for those to know whether ones
2426 * it transmitted were processed or returned.
2427 */
Jouni Malinen026331c2010-02-15 12:53:10 +02002428
Johannes Berg804483e2012-03-05 22:18:41 +01002429 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2430 sig = status->signal;
2431
2432 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, sig,
Johannes Berg2e161f72010-08-12 15:38:38 +02002433 rx->skb->data, rx->skb->len,
2434 GFP_ATOMIC)) {
2435 if (rx->sta)
2436 rx->sta->rx_packets++;
2437 dev_kfree_skb(rx->skb);
2438 return RX_QUEUED;
2439 }
2440
2441
2442 return RX_CONTINUE;
2443}
2444
2445static ieee80211_rx_result debug_noinline
2446ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2447{
2448 struct ieee80211_local *local = rx->local;
2449 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2450 struct sk_buff *nskb;
2451 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02002452 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002453
2454 if (!ieee80211_is_action(mgmt->frame_control))
2455 return RX_CONTINUE;
2456
2457 /*
2458 * For AP mode, hostapd is responsible for handling any action
2459 * frames that we didn't handle, including returning unknown
2460 * ones. For all other modes we will return them to the sender,
2461 * setting the 0x80 bit in the action category, as required by
2462 * 802.11-2007 7.3.1.11.
2463 * Newer versions of hostapd shall also use the management frame
2464 * registration mechanisms, but older ones still use cooked
2465 * monitor interfaces so push all frames there.
2466 */
Johannes Berg554891e2010-09-24 12:38:25 +02002467 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
Johannes Berg2e161f72010-08-12 15:38:38 +02002468 (sdata->vif.type == NL80211_IFTYPE_AP ||
2469 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2470 return RX_DROP_MONITOR;
Jouni Malinen026331c2010-02-15 12:53:10 +02002471
Johannes Berg84040802010-02-15 12:46:39 +02002472 /* do not return rejected action frames */
2473 if (mgmt->u.action.category & 0x80)
2474 return RX_DROP_UNUSABLE;
2475
2476 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2477 GFP_ATOMIC);
2478 if (nskb) {
John W. Linville292b4df2010-06-24 11:13:56 -04002479 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
Johannes Berg84040802010-02-15 12:46:39 +02002480
John W. Linville292b4df2010-06-24 11:13:56 -04002481 nmgmt->u.action.category |= 0x80;
2482 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2483 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
Johannes Berg84040802010-02-15 12:46:39 +02002484
2485 memset(nskb->cb, 0, sizeof(nskb->cb));
2486
2487 ieee80211_tx_skb(rx->sdata, nskb);
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002488 }
Johannes Berg39192c02008-09-09 14:49:03 +02002489 dev_kfree_skb(rx->skb);
2490 return RX_QUEUED;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002491}
2492
2493static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002494ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02002495{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002496 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg77a121c2010-06-10 10:21:34 +02002497 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2498 __le16 stype;
Johannes Berg571ecf62007-07-27 15:43:22 +02002499
Johannes Berg77a121c2010-06-10 10:21:34 +02002500 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
Johannes Berg472dbc42008-09-11 00:01:49 +02002501
Johannes Berg77a121c2010-06-10 10:21:34 +02002502 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2503 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2504 sdata->vif.type != NL80211_IFTYPE_STATION)
2505 return RX_DROP_MONITOR;
Johannes Bergf9d540e2007-09-28 14:02:09 +02002506
Johannes Berg77a121c2010-06-10 10:21:34 +02002507 switch (stype) {
Johannes Berg66e67e42012-01-20 13:55:27 +01002508 case cpu_to_le16(IEEE80211_STYPE_AUTH):
Johannes Berg77a121c2010-06-10 10:21:34 +02002509 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2510 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2511 /* process for all: mesh, mlme, ibss */
2512 break;
Johannes Berg66e67e42012-01-20 13:55:27 +01002513 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2514 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
Johannes Berg77a121c2010-06-10 10:21:34 +02002515 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2516 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
Christian Lamparter2c313332010-11-29 20:53:23 +01002517 if (is_multicast_ether_addr(mgmt->da) &&
2518 !is_broadcast_ether_addr(mgmt->da))
2519 return RX_DROP_MONITOR;
2520
Johannes Berg77a121c2010-06-10 10:21:34 +02002521 /* process only for station */
2522 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2523 return RX_DROP_MONITOR;
2524 break;
2525 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
Johannes Berg77a121c2010-06-10 10:21:34 +02002526 /* process only for ibss */
2527 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2528 return RX_DROP_MONITOR;
2529 break;
2530 default:
2531 return RX_DROP_MONITOR;
2532 }
Johannes Berg46900292009-02-15 12:44:28 +01002533
Johannes Berg77a121c2010-06-10 10:21:34 +02002534 /* queue up frame and kick off work to process it */
Johannes Bergc1475ca2010-06-10 10:21:37 +02002535 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg77a121c2010-06-10 10:21:34 +02002536 skb_queue_tail(&sdata->skb_queue, rx->skb);
2537 ieee80211_queue_work(&rx->local->hw, &sdata->work);
Johannes Berg8b58ff82010-06-10 10:21:51 +02002538 if (rx->sta)
2539 rx->sta->rx_packets++;
Johannes Berg77a121c2010-06-10 10:21:34 +02002540
2541 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002542}
2543
Johannes Berg5cf121c2008-02-25 16:27:43 +01002544/* TODO: use IEEE80211_RX_FRAGMENTED */
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002545static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2546 struct ieee80211_rate *rate)
Michael Wu3d30d942008-01-31 19:48:27 +01002547{
2548 struct ieee80211_sub_if_data *sdata;
2549 struct ieee80211_local *local = rx->local;
Michael Wu3d30d942008-01-31 19:48:27 +01002550 struct sk_buff *skb = rx->skb, *skb2;
2551 struct net_device *prev_dev = NULL;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002552 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg293702a2012-03-02 13:18:19 +01002553 int needed_headroom;
Michael Wu3d30d942008-01-31 19:48:27 +01002554
Johannes Berg554891e2010-09-24 12:38:25 +02002555 /*
2556 * If cooked monitor has been processed already, then
2557 * don't do it again. If not, set the flag.
2558 */
2559 if (rx->flags & IEEE80211_RX_CMNTR)
John W. Linville7c1e1832010-09-24 15:52:49 -04002560 goto out_free_skb;
Johannes Berg554891e2010-09-24 12:38:25 +02002561 rx->flags |= IEEE80211_RX_CMNTR;
John W. Linville7c1e1832010-09-24 15:52:49 -04002562
Johannes Berg152c4772011-10-21 10:22:22 +02002563 /* If there are no cooked monitor interfaces, just free the SKB */
2564 if (!local->cooked_mntrs)
2565 goto out_free_skb;
2566
Johannes Berg293702a2012-03-02 13:18:19 +01002567 /* room for the radiotap header based on driver features */
2568 needed_headroom = ieee80211_rx_radiotap_len(local, status);
2569
2570 if (skb_headroom(skb) < needed_headroom &&
2571 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
Michael Wu3d30d942008-01-31 19:48:27 +01002572 goto out_free_skb;
2573
Johannes Berg293702a2012-03-02 13:18:19 +01002574 /* prepend radiotap information */
Felix Fietkau973ef212012-04-16 14:56:48 +02002575 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2576 false);
Michael Wu3d30d942008-01-31 19:48:27 +01002577
2578 skb_set_mac_header(skb, 0);
2579 skb->ip_summed = CHECKSUM_UNNECESSARY;
2580 skb->pkt_type = PACKET_OTHERHOST;
2581 skb->protocol = htons(ETH_P_802_2);
2582
2583 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01002584 if (!ieee80211_sdata_running(sdata))
Michael Wu3d30d942008-01-31 19:48:27 +01002585 continue;
2586
Johannes Berg05c914f2008-09-11 00:01:58 +02002587 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Michael Wu3d30d942008-01-31 19:48:27 +01002588 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2589 continue;
2590
2591 if (prev_dev) {
2592 skb2 = skb_clone(skb, GFP_ATOMIC);
2593 if (skb2) {
2594 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04002595 netif_receive_skb(skb2);
Michael Wu3d30d942008-01-31 19:48:27 +01002596 }
2597 }
2598
2599 prev_dev = sdata->dev;
2600 sdata->dev->stats.rx_packets++;
2601 sdata->dev->stats.rx_bytes += skb->len;
2602 }
2603
2604 if (prev_dev) {
2605 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04002606 netif_receive_skb(skb);
Johannes Berg554891e2010-09-24 12:38:25 +02002607 return;
2608 }
Michael Wu3d30d942008-01-31 19:48:27 +01002609
2610 out_free_skb:
2611 dev_kfree_skb(skb);
2612}
2613
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002614static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2615 ieee80211_rx_result res)
2616{
2617 switch (res) {
2618 case RX_DROP_MONITOR:
2619 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2620 if (rx->sta)
2621 rx->sta->rx_dropped++;
2622 /* fall through */
2623 case RX_CONTINUE: {
2624 struct ieee80211_rate *rate = NULL;
2625 struct ieee80211_supported_band *sband;
2626 struct ieee80211_rx_status *status;
2627
2628 status = IEEE80211_SKB_RXCB((rx->skb));
2629
2630 sband = rx->local->hw.wiphy->bands[status->band];
2631 if (!(status->flag & RX_FLAG_HT))
2632 rate = &sband->bitrates[status->rate_idx];
2633
2634 ieee80211_rx_cooked_monitor(rx, rate);
2635 break;
2636 }
2637 case RX_DROP_UNUSABLE:
2638 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2639 if (rx->sta)
2640 rx->sta->rx_dropped++;
2641 dev_kfree_skb(rx->skb);
2642 break;
2643 case RX_QUEUED:
2644 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2645 break;
2646 }
2647}
2648
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002649static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002650{
2651 ieee80211_rx_result res = RX_DROP_MONITOR;
2652 struct sk_buff *skb;
2653
2654#define CALL_RXH(rxh) \
2655 do { \
2656 res = rxh(rx); \
2657 if (res != RX_CONTINUE) \
2658 goto rxh_next; \
2659 } while (0);
2660
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002661 spin_lock(&rx->local->rx_skb_queue.lock);
2662 if (rx->local->running_rx_handler)
2663 goto unlock;
2664
2665 rx->local->running_rx_handler = true;
2666
2667 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2668 spin_unlock(&rx->local->rx_skb_queue.lock);
2669
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002670 /*
2671 * all the other fields are valid across frames
2672 * that belong to an aMPDU since they are on the
2673 * same TID from the same station
2674 */
2675 rx->skb = skb;
2676
2677 CALL_RXH(ieee80211_rx_h_decrypt)
2678 CALL_RXH(ieee80211_rx_h_check_more_data)
Johannes Berg47086fc2011-09-29 16:04:33 +02002679 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002680 CALL_RXH(ieee80211_rx_h_sta_process)
2681 CALL_RXH(ieee80211_rx_h_defragment)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002682 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2683 /* must be after MMIC verify so header is counted in MPDU mic */
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002684#ifdef CONFIG_MAC80211_MESH
2685 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2686 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2687#endif
Javier Cardona2154c812011-09-07 17:49:53 -07002688 CALL_RXH(ieee80211_rx_h_amsdu)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002689 CALL_RXH(ieee80211_rx_h_data)
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002690 CALL_RXH(ieee80211_rx_h_ctrl);
Johannes Berg2e161f72010-08-12 15:38:38 +02002691 CALL_RXH(ieee80211_rx_h_mgmt_check)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002692 CALL_RXH(ieee80211_rx_h_action)
Johannes Berg2e161f72010-08-12 15:38:38 +02002693 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2694 CALL_RXH(ieee80211_rx_h_action_return)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002695 CALL_RXH(ieee80211_rx_h_mgmt)
2696
2697 rxh_next:
2698 ieee80211_rx_handlers_result(rx, res);
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002699 spin_lock(&rx->local->rx_skb_queue.lock);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002700#undef CALL_RXH
2701 }
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002702
2703 rx->local->running_rx_handler = false;
2704
2705 unlock:
2706 spin_unlock(&rx->local->rx_skb_queue.lock);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002707}
Johannes Berg571ecf62007-07-27 15:43:22 +02002708
Johannes Berg4406c372010-09-24 11:21:06 +02002709static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
Johannes Berg58905292008-01-31 19:48:25 +01002710{
Johannes Berg58905292008-01-31 19:48:25 +01002711 ieee80211_rx_result res = RX_DROP_MONITOR;
2712
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002713#define CALL_RXH(rxh) \
2714 do { \
2715 res = rxh(rx); \
2716 if (res != RX_CONTINUE) \
Johannes Berg2569a822009-11-25 17:46:17 +01002717 goto rxh_next; \
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002718 } while (0);
Johannes Berg58905292008-01-31 19:48:25 +01002719
Johannes Berg49461622008-06-30 15:10:45 +02002720 CALL_RXH(ieee80211_rx_h_passive_scan)
2721 CALL_RXH(ieee80211_rx_h_check)
Johannes Berg2569a822009-11-25 17:46:17 +01002722
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002723 ieee80211_rx_reorder_ampdu(rx);
Johannes Berg2569a822009-11-25 17:46:17 +01002724
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002725 ieee80211_rx_handlers(rx);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002726 return;
Johannes Berg49461622008-06-30 15:10:45 +02002727
Johannes Berg2569a822009-11-25 17:46:17 +01002728 rxh_next:
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002729 ieee80211_rx_handlers_result(rx, res);
2730
2731#undef CALL_RXH
Johannes Berg58905292008-01-31 19:48:25 +01002732}
2733
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002734/*
Johannes Bergdd318572010-11-29 11:09:16 +01002735 * This function makes calls into the RX path, therefore
2736 * it has to be invoked under RCU read lock.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002737 */
2738void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2739{
Johannes Berg554891e2010-09-24 12:38:25 +02002740 struct ieee80211_rx_data rx = {
2741 .sta = sta,
2742 .sdata = sta->sdata,
2743 .local = sta->local,
Johannes Berg9e262972011-07-07 18:45:03 +02002744 /* This is OK -- must be QoS data frame */
2745 .security_idx = tid,
2746 .seqno_idx = tid,
Helmut Schaafcf8bd32011-04-01 15:46:05 +02002747 .flags = 0,
Johannes Berg554891e2010-09-24 12:38:25 +02002748 };
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02002749 struct tid_ampdu_rx *tid_agg_rx;
2750
2751 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2752 if (!tid_agg_rx)
2753 return;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002754
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02002755 spin_lock(&tid_agg_rx->reorder_lock);
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002756 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02002757 spin_unlock(&tid_agg_rx->reorder_lock);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002758
Christian Lamparter24a8fda2010-12-30 17:25:29 +01002759 ieee80211_rx_handlers(&rx);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002760}
2761
Johannes Berg571ecf62007-07-27 15:43:22 +02002762/* main receive path */
2763
Johannes Berg20b01f82010-09-24 11:21:05 +02002764static int prepare_for_handlers(struct ieee80211_rx_data *rx,
Johannes Berg23a24de2007-07-27 15:43:22 +02002765 struct ieee80211_hdr *hdr)
2766{
Johannes Berg20b01f82010-09-24 11:21:05 +02002767 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002768 struct sk_buff *skb = rx->skb;
2769 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2770 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02002771 int multicast = is_multicast_ether_addr(hdr->addr1);
2772
Johannes Berg51fb61e2007-12-19 01:31:27 +01002773 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02002774 case NL80211_IFTYPE_STATION:
Johannes Berg9bc383d2009-11-19 11:55:19 +01002775 if (!bssid && !sdata->u.mgd.use_4addr)
Johannes Berg23a24de2007-07-27 15:43:22 +02002776 return 0;
Johannes Berg77fdaa12009-07-07 03:45:17 +02002777 if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002778 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
Felix Fietkau4f312332011-02-05 23:48:37 +01002779 if (!(sdata->dev->flags & IFF_PROMISC) ||
2780 sdata->u.mgd.use_4addr)
Johannes Berg23a24de2007-07-27 15:43:22 +02002781 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02002782 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002783 }
2784 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002785 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02002786 if (!bssid)
2787 return 0;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002788 if (ieee80211_is_beacon(hdr->frame_control)) {
Bruno Randolf9d9bf772008-02-18 11:21:36 +09002789 return 1;
Vladimir Koutny87291c02008-06-13 16:50:44 +02002790 }
Johannes Berg46900292009-02-15 12:44:28 +01002791 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
Johannes Berg554891e2010-09-24 12:38:25 +02002792 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002793 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02002794 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002795 } else if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002796 compare_ether_addr(sdata->vif.addr,
Johannes Berg23a24de2007-07-27 15:43:22 +02002797 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002798 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002799 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02002800 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002801 } else if (!rx->sta) {
2802 int rate_idx;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002803 if (status->flag & RX_FLAG_HT)
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002804 rate_idx = 0; /* TODO: HT rates */
2805 else
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002806 rate_idx = status->rate_idx;
Johannes Berg8bf11d82011-12-15 11:17:37 +01002807 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2808 BIT(rate_idx));
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002809 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002810 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002811 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg6032f932008-02-23 15:17:07 +01002812 if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002813 compare_ether_addr(sdata->vif.addr,
Johannes Berg6032f932008-02-23 15:17:07 +01002814 hdr->addr1) != 0) {
2815 if (!(sdata->dev->flags & IFF_PROMISC))
2816 return 0;
2817
Johannes Berg554891e2010-09-24 12:38:25 +02002818 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg6032f932008-02-23 15:17:07 +01002819 }
2820 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002821 case NL80211_IFTYPE_AP_VLAN:
2822 case NL80211_IFTYPE_AP:
Johannes Berg23a24de2007-07-27 15:43:22 +02002823 if (!bssid) {
Johannes Berg47846c92009-11-25 17:46:19 +01002824 if (compare_ether_addr(sdata->vif.addr,
Johannes Berg23a24de2007-07-27 15:43:22 +02002825 hdr->addr1))
2826 return 0;
2827 } else if (!ieee80211_bssid_match(bssid,
Johannes Berg47846c92009-11-25 17:46:19 +01002828 sdata->vif.addr)) {
Johannes Berg3df6eae2011-12-06 10:39:40 +01002829 /*
2830 * Accept public action frames even when the
2831 * BSSID doesn't match, this is used for P2P
2832 * and location updates. Note that mac80211
2833 * itself never looks at these frames.
2834 */
Arik Nemtsov771bbd02011-02-01 13:23:05 +02002835 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
Johannes Berg3df6eae2011-12-06 10:39:40 +01002836 ieee80211_is_public_action(hdr, skb->len))
2837 return 1;
2838 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2839 !ieee80211_is_beacon(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02002840 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02002841 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002842 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002843 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002844 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07002845 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02002846 return 0;
2847 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2848 return 0;
2849 break;
Johannes Berg2ca27bc2010-09-16 14:58:23 +02002850 default:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02002851 /* should never get here */
2852 WARN_ON(1);
2853 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02002854 }
2855
2856 return 1;
2857}
2858
Johannes Berg571ecf62007-07-27 15:43:22 +02002859/*
Johannes Berg4406c372010-09-24 11:21:06 +02002860 * This function returns whether or not the SKB
2861 * was destined for RX processing or not, which,
2862 * if consume is true, is equivalent to whether
2863 * or not the skb was consumed.
2864 */
2865static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2866 struct sk_buff *skb, bool consume)
2867{
2868 struct ieee80211_local *local = rx->local;
2869 struct ieee80211_sub_if_data *sdata = rx->sdata;
2870 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2871 struct ieee80211_hdr *hdr = (void *)skb->data;
2872 int prepares;
2873
2874 rx->skb = skb;
Johannes Berg554891e2010-09-24 12:38:25 +02002875 status->rx_flags |= IEEE80211_RX_RA_MATCH;
Johannes Berg4406c372010-09-24 11:21:06 +02002876 prepares = prepare_for_handlers(rx, hdr);
2877
2878 if (!prepares)
2879 return false;
2880
Johannes Berg4406c372010-09-24 11:21:06 +02002881 if (!consume) {
2882 skb = skb_copy(skb, GFP_ATOMIC);
2883 if (!skb) {
2884 if (net_ratelimit())
2885 wiphy_debug(local->hw.wiphy,
Ben Greearb305dae2011-01-08 10:30:54 -08002886 "failed to copy skb for %s\n",
Johannes Berg4406c372010-09-24 11:21:06 +02002887 sdata->name);
2888 return true;
2889 }
2890
2891 rx->skb = skb;
2892 }
2893
2894 ieee80211_invoke_rx_handlers(rx);
2895 return true;
2896}
2897
2898/*
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002899 * This is the actual Rx frames handler. as it blongs to Rx path it must
2900 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02002901 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002902static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
Christian Lamparter071d9ac2010-08-05 01:36:36 +02002903 struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02002904{
Johannes Berg554891e2010-09-24 12:38:25 +02002905 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002906 struct ieee80211_local *local = hw_to_local(hw);
2907 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002908 struct ieee80211_hdr *hdr;
Zhu Yie3cf8b32010-03-29 17:35:07 +08002909 __le16 fc;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002910 struct ieee80211_rx_data rx;
Johannes Berg4406c372010-09-24 11:21:06 +02002911 struct ieee80211_sub_if_data *prev;
Ben Greear56af3262010-09-23 10:22:24 -07002912 struct sta_info *sta, *tmp, *prev_sta;
Zhu Yie3cf8b32010-03-29 17:35:07 +08002913 int err = 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02002914
Zhu Yie3cf8b32010-03-29 17:35:07 +08002915 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02002916 memset(&rx, 0, sizeof(rx));
2917 rx.skb = skb;
2918 rx.local = local;
Johannes Berg72abd812007-09-17 01:29:22 -04002919
Zhu Yie3cf8b32010-03-29 17:35:07 +08002920 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
Johannes Berg571ecf62007-07-27 15:43:22 +02002921 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02002922
Helmut Schaa142b9f52009-07-23 13:18:01 +02002923 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
Ben Greearb23b0252011-02-04 11:54:17 -08002924 test_bit(SCAN_SW_SCANNING, &local->scanning)))
Johannes Berg554891e2010-09-24 12:38:25 +02002925 status->rx_flags |= IEEE80211_RX_IN_SCAN;
Johannes Berg571ecf62007-07-27 15:43:22 +02002926
Zhu Yie3cf8b32010-03-29 17:35:07 +08002927 if (ieee80211_is_mgmt(fc))
2928 err = skb_linearize(skb);
2929 else
2930 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2931
2932 if (err) {
2933 dev_kfree_skb(skb);
2934 return;
2935 }
2936
2937 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg38f37142008-01-29 17:07:43 +01002938 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01002939 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01002940
Zhu Yie3cf8b32010-03-29 17:35:07 +08002941 if (ieee80211_is_data(fc)) {
Ben Greear56af3262010-09-23 10:22:24 -07002942 prev_sta = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02002943
Johannes Berg7852e362012-01-20 13:55:24 +01002944 for_each_sta_info(local, hdr->addr2, sta, tmp) {
Ben Greear56af3262010-09-23 10:22:24 -07002945 if (!prev_sta) {
2946 prev_sta = sta;
2947 continue;
2948 }
2949
2950 rx.sta = prev_sta;
2951 rx.sdata = prev_sta->sdata;
Johannes Berg4406c372010-09-24 11:21:06 +02002952 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Johannes Berg571ecf62007-07-27 15:43:22 +02002953
Ben Greear56af3262010-09-23 10:22:24 -07002954 prev_sta = sta;
Johannes Berg4406c372010-09-24 11:21:06 +02002955 }
Ben Greear56af3262010-09-23 10:22:24 -07002956
2957 if (prev_sta) {
2958 rx.sta = prev_sta;
2959 rx.sdata = prev_sta->sdata;
2960
Johannes Berg4406c372010-09-24 11:21:06 +02002961 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
Ben Greear56af3262010-09-23 10:22:24 -07002962 return;
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05302963 goto out;
Ben Greear56af3262010-09-23 10:22:24 -07002964 }
Johannes Berg4406c372010-09-24 11:21:06 +02002965 }
2966
Johannes Berg4b0dd982010-09-24 11:21:07 +02002967 prev = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02002968
Johannes Berg4b0dd982010-09-24 11:21:07 +02002969 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2970 if (!ieee80211_sdata_running(sdata))
2971 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01002972
Johannes Berg4b0dd982010-09-24 11:21:07 +02002973 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2974 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2975 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01002976
Johannes Berg4b0dd982010-09-24 11:21:07 +02002977 /*
2978 * frame is destined for this interface, but if it's
2979 * not also for the previous one we handle that after
2980 * the loop to avoid copying the SKB once too much
2981 */
Johannes Bergb2e77712007-09-26 15:19:39 +02002982
Johannes Berg4b0dd982010-09-24 11:21:07 +02002983 if (!prev) {
Johannes Berg340e11f2007-07-27 15:43:22 +02002984 prev = sdata;
Johannes Berg4b0dd982010-09-24 11:21:07 +02002985 continue;
Johannes Berg8e6f0032007-07-27 15:43:22 +02002986 }
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002987
Johannes Berg7852e362012-01-20 13:55:24 +01002988 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Johannes Berg4b0dd982010-09-24 11:21:07 +02002989 rx.sdata = prev;
2990 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002991
Johannes Berg4b0dd982010-09-24 11:21:07 +02002992 prev = sdata;
2993 }
Johannes Berg4406c372010-09-24 11:21:06 +02002994
Johannes Berg4b0dd982010-09-24 11:21:07 +02002995 if (prev) {
Johannes Berg7852e362012-01-20 13:55:24 +01002996 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Johannes Berg4b0dd982010-09-24 11:21:07 +02002997 rx.sdata = prev;
2998
2999 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3000 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02003001 }
Johannes Berg4406c372010-09-24 11:21:06 +02003002
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05303003 out:
Johannes Berg4406c372010-09-24 11:21:06 +02003004 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02003005}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003006
3007/*
3008 * This is the receive path handler. It is called by a low level driver when an
3009 * 802.11 MPDU is received from the hardware.
3010 */
John W. Linville103bf9f2009-08-20 16:34:15 -04003011void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003012{
3013 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01003014 struct ieee80211_rate *rate = NULL;
3015 struct ieee80211_supported_band *sband;
Johannes Bergf1d58c22009-06-17 13:13:00 +02003016 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg8318d782008-01-24 19:38:38 +01003017
Johannes Bergd20ef632009-10-11 15:10:40 +02003018 WARN_ON_ONCE(softirq_count() == 0);
3019
Johannes Berg77a980d2009-08-24 11:46:30 +02003020 if (WARN_ON(status->band < 0 ||
3021 status->band >= IEEE80211_NUM_BANDS))
3022 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01003023
3024 sband = local->hw.wiphy->bands[status->band];
Johannes Berg77a980d2009-08-24 11:46:30 +02003025 if (WARN_ON(!sband))
3026 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01003027
Johannes Berg89c3a8a2009-07-28 18:10:17 +02003028 /*
3029 * If we're suspending, it is possible although not too likely
3030 * that we'd be receiving frames after having already partially
3031 * quiesced the stack. We can't process such frames then since
3032 * that might, for example, cause stations to be added or other
3033 * driver callbacks be invoked.
3034 */
Johannes Berg77a980d2009-08-24 11:46:30 +02003035 if (unlikely(local->quiescing || local->suspended))
3036 goto drop;
Johannes Berg89c3a8a2009-07-28 18:10:17 +02003037
Johannes Bergea77f122009-08-21 14:44:45 +02003038 /*
3039 * The same happens when we're not even started,
3040 * but that's worth a warning.
3041 */
Johannes Berg77a980d2009-08-24 11:46:30 +02003042 if (WARN_ON(!local->started))
3043 goto drop;
Johannes Bergea77f122009-08-21 14:44:45 +02003044
Johannes Bergfc885182010-07-30 13:23:12 +02003045 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05003046 /*
Johannes Bergfc885182010-07-30 13:23:12 +02003047 * Validate the rate, unless a PLCP error means that
3048 * we probably can't have a valid rate here anyway.
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05003049 */
Johannes Bergfc885182010-07-30 13:23:12 +02003050
3051 if (status->flag & RX_FLAG_HT) {
3052 /*
3053 * rate_idx is MCS index, which can be [0-76]
3054 * as documented on:
3055 *
3056 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3057 *
3058 * Anything else would be some sort of driver or
3059 * hardware error. The driver should catch hardware
3060 * errors.
3061 */
3062 if (WARN((status->rate_idx < 0 ||
3063 status->rate_idx > 76),
3064 "Rate marked as an HT rate but passed "
3065 "status->rate_idx is not "
3066 "an MCS index [0-76]: %d (0x%02x)\n",
3067 status->rate_idx,
3068 status->rate_idx))
3069 goto drop;
3070 } else {
3071 if (WARN_ON(status->rate_idx < 0 ||
3072 status->rate_idx >= sband->n_bitrates))
3073 goto drop;
3074 rate = &sband->bitrates[status->rate_idx];
3075 }
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003076 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003077
Johannes Berg554891e2010-09-24 12:38:25 +02003078 status->rx_flags = 0;
3079
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003080 /*
3081 * key references and virtual interfaces are protected using RCU
3082 * and this requires that we are in a read-side RCU section during
3083 * receive processing
3084 */
3085 rcu_read_lock();
3086
3087 /*
3088 * Frames with failed FCS/PLCP checksum are not returned,
3089 * all other frames are returned without radiotap header
3090 * if it was previously present.
3091 * Also, frames with less than 16 bytes are dropped.
3092 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02003093 skb = ieee80211_rx_monitor(local, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003094 if (!skb) {
3095 rcu_read_unlock();
3096 return;
3097 }
3098
Johannes Berge1e54062010-11-30 08:58:45 +01003099 ieee80211_tpt_led_trig_rx(local,
3100 ((struct ieee80211_hdr *)skb->data)->frame_control,
3101 skb->len);
Christian Lamparter071d9ac2010-08-05 01:36:36 +02003102 __ieee80211_rx_handle_packet(hw, skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003103
3104 rcu_read_unlock();
Johannes Berg77a980d2009-08-24 11:46:30 +02003105
3106 return;
3107 drop:
3108 kfree_skb(skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003109}
John W. Linville103bf9f2009-08-20 16:34:15 -04003110EXPORT_SYMBOL(ieee80211_rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02003111
3112/* This is a version of the rx handler that can be called from hard irq
3113 * context. Post the skb on the queue and schedule the tasklet */
Johannes Bergf1d58c22009-06-17 13:13:00 +02003114void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02003115{
3116 struct ieee80211_local *local = hw_to_local(hw);
3117
3118 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3119
Johannes Berg571ecf62007-07-27 15:43:22 +02003120 skb->pkt_type = IEEE80211_RX_MSG;
3121 skb_queue_tail(&local->skb_queue, skb);
3122 tasklet_schedule(&local->tasklet);
3123}
3124EXPORT_SYMBOL(ieee80211_rx_irqsafe);