blob: b01e467b76c69f15aa8de00434deca874b89ae48 [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>
Johannes Berg571ecf62007-07-27 15:43:22 +020019#include <net/mac80211.h>
20#include <net/ieee80211_radiotap.h>
21
22#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020023#include "driver-ops.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040024#include "led.h"
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +010025#include "mesh.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020026#include "wep.h"
27#include "wpa.h"
28#include "tkip.h"
29#include "wme.h"
30
Johannes Bergb2e77712007-09-26 15:19:39 +020031/*
32 * monitor mode reception
33 *
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
36 */
37static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
Johannes Berg0869aea2009-10-28 10:03:35 +010038 struct sk_buff *skb)
Johannes Bergb2e77712007-09-26 15:19:39 +020039{
Johannes Bergb2e77712007-09-26 15:19:39 +020040 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
Zhu Yie3cf8b32010-03-29 17:35:07 +080042 __pskb_trim(skb, skb->len - FCS_LEN);
Johannes Bergb2e77712007-09-26 15:19:39 +020043 else {
44 /* driver bug */
45 WARN_ON(1);
46 dev_kfree_skb(skb);
47 skb = NULL;
48 }
49 }
50
51 return skb;
52}
53
Johannes Bergf1d58c22009-06-17 13:13:00 +020054static inline int should_drop_frame(struct sk_buff *skb,
Johannes Berg0869aea2009-10-28 10:03:35 +010055 int present_fcs_len)
Johannes Bergb2e77712007-09-26 15:19:39 +020056{
Johannes Bergf1d58c22009-06-17 13:13:00 +020057 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Harvey Harrison182503a2008-06-22 16:45:29 -070058 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Bergb2e77712007-09-26 15:19:39 +020059
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 return 1;
Johannes Berg0869aea2009-10-28 10:03:35 +010062 if (unlikely(skb->len < 16 + present_fcs_len))
Johannes Bergb2e77712007-09-26 15:19:39 +020063 return 1;
Harvey Harrison87228f52008-06-11 14:21:59 -070064 if (ieee80211_is_ctl(hdr->frame_control) &&
65 !ieee80211_is_pspoll(hdr->frame_control) &&
66 !ieee80211_is_back_req(hdr->frame_control))
Johannes Bergb2e77712007-09-26 15:19:39 +020067 return 1;
68 return 0;
69}
70
Bruno Randolf601ae7f2008-05-08 19:22:43 +020071static int
72ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73 struct ieee80211_rx_status *status)
74{
75 int len;
76
77 /* always present fields */
78 len = sizeof(struct ieee80211_radiotap_header) + 9;
79
80 if (status->flag & RX_FLAG_TSFT)
81 len += 8;
Johannes Berg7fee5372009-01-30 11:13:06 +010082 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
Bruno Randolf601ae7f2008-05-08 19:22:43 +020083 len += 1;
Bruno Randolf601ae7f2008-05-08 19:22:43 +020084
85 if (len & 1) /* padding for RX_FLAGS if necessary */
86 len++;
87
Bruno Randolf601ae7f2008-05-08 19:22:43 +020088 return len;
89}
90
Johannes Bergd1c3a372009-01-07 00:26:10 +010091/*
Bruno Randolf601ae7f2008-05-08 19:22:43 +020092 * ieee80211_add_rx_radiotap_header - add radiotap header
93 *
94 * add a radiotap header containing all the fields which the hardware provided.
95 */
96static void
97ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
98 struct sk_buff *skb,
Bruno Randolf601ae7f2008-05-08 19:22:43 +020099 struct ieee80211_rate *rate,
100 int rtap_len)
101{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200102 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200103 struct ieee80211_radiotap_header *rthdr;
104 unsigned char *pos;
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100105 u16 rx_flags = 0;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200106
107 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
108 memset(rthdr, 0, rtap_len);
109
110 /* radiotap header, set always present flags */
111 rthdr->it_present =
112 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200113 (1 << IEEE80211_RADIOTAP_CHANNEL) |
114 (1 << IEEE80211_RADIOTAP_ANTENNA) |
115 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
116 rthdr->it_len = cpu_to_le16(rtap_len);
117
118 pos = (unsigned char *)(rthdr+1);
119
120 /* the order of the following fields is important */
121
122 /* IEEE80211_RADIOTAP_TSFT */
123 if (status->flag & RX_FLAG_TSFT) {
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100124 put_unaligned_le64(status->mactime, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200125 rthdr->it_present |=
126 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
127 pos += 8;
128 }
129
130 /* IEEE80211_RADIOTAP_FLAGS */
131 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
132 *pos |= IEEE80211_RADIOTAP_F_FCS;
Johannes Bergaae89832009-03-13 12:52:10 +0100133 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
134 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
Bruno Randolfb4f28bb2008-07-30 17:19:55 +0200135 if (status->flag & RX_FLAG_SHORTPRE)
136 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200137 pos++;
138
139 /* IEEE80211_RADIOTAP_RATE */
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200140 if (status->flag & RX_FLAG_HT) {
141 /*
142 * TODO: add following information into radiotap header once
143 * suitable fields are defined for it:
144 * - MCS index (status->rate_idx)
145 * - HT40 (status->flag & RX_FLAG_40MHZ)
146 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
147 */
148 *pos = 0;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200149 } else {
Jouni Malinenebe6c7b2009-01-10 11:47:33 +0200150 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200151 *pos = rate->bitrate / 5;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200152 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200153 pos++;
154
155 /* IEEE80211_RADIOTAP_CHANNEL */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100156 put_unaligned_le16(status->freq, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200157 pos += 2;
158 if (status->band == IEEE80211_BAND_5GHZ)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100159 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
160 pos);
Johannes Berg5f0b7de2009-11-16 13:58:21 +0100161 else if (status->flag & RX_FLAG_HT)
162 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
163 pos);
Bruno Randolf9deb1ae2008-07-30 17:20:06 +0200164 else if (rate->flags & IEEE80211_RATE_ERP_G)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100165 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
166 pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200167 else
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100168 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
169 pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200170 pos += 2;
171
172 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
173 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
174 *pos = status->signal;
175 rthdr->it_present |=
176 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
177 pos++;
178 }
179
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200180 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
181
182 /* IEEE80211_RADIOTAP_ANTENNA */
183 *pos = status->antenna;
184 pos++;
185
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200186 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
187
188 /* IEEE80211_RADIOTAP_RX_FLAGS */
189 /* ensure 2 byte alignment for the 2 byte field as required */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100190 if ((pos - (u8 *)rthdr) & 1)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200191 pos++;
Johannes Bergaae89832009-03-13 12:52:10 +0100192 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100193 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
194 put_unaligned_le16(rx_flags, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200195 pos += 2;
196}
197
Johannes Bergb2e77712007-09-26 15:19:39 +0200198/*
199 * This function copies a received frame to all monitor interfaces and
200 * returns a cleaned-up SKB that no longer includes the FCS nor the
201 * radiotap header the driver might have added.
202 */
203static struct sk_buff *
204ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
Johannes Berg8318d782008-01-24 19:38:38 +0100205 struct ieee80211_rate *rate)
Johannes Bergb2e77712007-09-26 15:19:39 +0200206{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200207 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200208 struct ieee80211_sub_if_data *sdata;
Johannes Bergb2e77712007-09-26 15:19:39 +0200209 int needed_headroom = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200210 struct sk_buff *skb, *skb2;
211 struct net_device *prev_dev = NULL;
212 int present_fcs_len = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200213
214 /*
215 * First, we may need to make a copy of the skb because
216 * (1) we need to modify it for radiotap (if not present), and
217 * (2) the other RX handlers will modify the skb we got.
218 *
219 * We don't need to, of course, if we aren't going to return
220 * the SKB because it has a bad FCS/PLCP checksum.
221 */
Johannes Berg0869aea2009-10-28 10:03:35 +0100222
223 /* room for the radiotap header based on driver features */
224 needed_headroom = ieee80211_rx_radiotap_len(local, status);
Johannes Bergb2e77712007-09-26 15:19:39 +0200225
226 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
227 present_fcs_len = FCS_LEN;
228
Zhu Yie3cf8b32010-03-29 17:35:07 +0800229 /* make sure hdr->frame_control is on the linear part */
230 if (!pskb_may_pull(origskb, 2)) {
231 dev_kfree_skb(origskb);
232 return NULL;
233 }
234
Johannes Bergb2e77712007-09-26 15:19:39 +0200235 if (!local->monitors) {
Johannes Berg0869aea2009-10-28 10:03:35 +0100236 if (should_drop_frame(origskb, present_fcs_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200237 dev_kfree_skb(origskb);
238 return NULL;
239 }
240
Johannes Berg0869aea2009-10-28 10:03:35 +0100241 return remove_monitor_info(local, origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200242 }
243
Johannes Berg0869aea2009-10-28 10:03:35 +0100244 if (should_drop_frame(origskb, present_fcs_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200245 /* only need to expand headroom if necessary */
246 skb = origskb;
247 origskb = NULL;
248
249 /*
250 * This shouldn't trigger often because most devices have an
251 * RX header they pull before we get here, and that should
252 * be big enough for our radiotap information. We should
253 * probably export the length to drivers so that we can have
254 * them allocate enough headroom to start with.
255 */
256 if (skb_headroom(skb) < needed_headroom &&
Johannes Bergc49e5ea2007-12-11 21:33:42 +0100257 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200258 dev_kfree_skb(skb);
259 return NULL;
260 }
261 } else {
262 /*
263 * Need to make a copy and possibly remove radiotap header
264 * and FCS from the original.
265 */
266 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
267
Johannes Berg0869aea2009-10-28 10:03:35 +0100268 origskb = remove_monitor_info(local, origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200269
270 if (!skb)
271 return origskb;
272 }
273
Johannes Berg0869aea2009-10-28 10:03:35 +0100274 /* prepend radiotap information */
275 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
Johannes Bergb2e77712007-09-26 15:19:39 +0200276
Johannes Bergce3edf6d02007-12-19 01:31:22 +0100277 skb_reset_mac_header(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200278 skb->ip_summed = CHECKSUM_UNNECESSARY;
279 skb->pkt_type = PACKET_OTHERHOST;
280 skb->protocol = htons(ETH_P_802_2);
281
282 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200283 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +0200284 continue;
285
Michael Wu3d30d942008-01-31 19:48:27 +0100286 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
287 continue;
288
Johannes Berg9607e6b2009-12-23 13:15:31 +0100289 if (!ieee80211_sdata_running(sdata))
Johannes Berg47846c92009-11-25 17:46:19 +0100290 continue;
291
Johannes Bergb2e77712007-09-26 15:19:39 +0200292 if (prev_dev) {
293 skb2 = skb_clone(skb, GFP_ATOMIC);
294 if (skb2) {
295 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400296 netif_receive_skb(skb2);
Johannes Bergb2e77712007-09-26 15:19:39 +0200297 }
298 }
299
300 prev_dev = sdata->dev;
301 sdata->dev->stats.rx_packets++;
302 sdata->dev->stats.rx_bytes += skb->len;
303 }
304
305 if (prev_dev) {
306 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400307 netif_receive_skb(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200308 } else
309 dev_kfree_skb(skb);
310
311 return origskb;
312}
313
314
Johannes Berg5cf121c2008-02-25 16:27:43 +0100315static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200316{
Harvey Harrison238f74a2008-07-02 11:05:34 -0700317 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +0200318 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200319 int tid;
320
321 /* does the frame have a qos control field? */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700322 if (ieee80211_is_data_qos(hdr->frame_control)) {
323 u8 *qc = ieee80211_get_qos_ctl(hdr);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200324 /* frame has qos control */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700325 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
326 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
Johannes Berg554891e2010-09-24 12:38:25 +0200327 status->rx_flags |= IEEE80211_RX_AMSDU;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200328 } else {
Johannes Berg1411f9b2008-07-10 10:11:02 +0200329 /*
330 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
331 *
332 * Sequence numbers for management frames, QoS data
333 * frames with a broadcast/multicast address in the
334 * Address 1 field, and all non-QoS data frames sent
335 * by QoS STAs are assigned using an additional single
336 * modulo-4096 counter, [...]
337 *
338 * We also use that counter for non-QoS STAs.
339 */
340 tid = NUM_RX_DATA_QUEUES - 1;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200341 }
Johannes Berg52865df2007-07-27 15:43:22 +0200342
Johannes Berg5cf121c2008-02-25 16:27:43 +0100343 rx->queue = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200344 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
345 * For now, set skb->priority to 0 for other cases. */
346 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100347}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200348
Johannes Bergd1c3a372009-01-07 00:26:10 +0100349/**
350 * DOC: Packet alignment
351 *
352 * Drivers always need to pass packets that are aligned to two-byte boundaries
353 * to the stack.
354 *
355 * Additionally, should, if possible, align the payload data in a way that
356 * guarantees that the contained IP header is aligned to a four-byte
357 * boundary. In the case of regular frames, this simply means aligning the
358 * payload to a four-byte boundary (because either the IP header is directly
359 * contained, or IV/RFC1042 headers that have a length divisible by four are
Kalle Valo59d9cb02009-12-17 13:54:57 +0100360 * in front of it). If the payload data is not properly aligned and the
361 * architecture doesn't support efficient unaligned operations, mac80211
362 * will align the data.
Johannes Bergd1c3a372009-01-07 00:26:10 +0100363 *
364 * With A-MSDU frames, however, the payload data address must yield two modulo
365 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
366 * push the IP header further back to a multiple of four again. Thankfully, the
367 * specs were sane enough this time around to require padding each A-MSDU
368 * subframe to a length that is a multiple of four.
369 *
370 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
371 * the payload is not supported, the driver is required to move the 802.11
372 * header to be directly in front of the payload in that case.
373 */
374static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
Johannes Berg38f37142008-01-29 17:07:43 +0100375{
Kalle Valo59d9cb02009-12-17 13:54:57 +0100376#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
377 WARN_ONCE((unsigned long)rx->skb->data & 1,
378 "unaligned packet at 0x%p\n", rx->skb->data);
Johannes Bergd1c3a372009-01-07 00:26:10 +0100379#endif
Johannes Berg6e0d1142007-07-27 15:43:22 +0200380}
381
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +0200382
Johannes Berg571ecf62007-07-27 15:43:22 +0200383/* rx handlers */
384
Johannes Berg49461622008-06-30 15:10:45 +0200385static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100386ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200387{
388 struct ieee80211_local *local = rx->local;
Johannes Berg554891e2010-09-24 12:38:25 +0200389 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200390 struct sk_buff *skb = rx->skb;
391
Johannes Berg554891e2010-09-24 12:38:25 +0200392 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN)))
Johannes Berg4080c7c2010-09-24 11:21:08 +0200393 return RX_CONTINUE;
394
395 if (test_bit(SCAN_HW_SCANNING, &local->scanning))
Johannes Bergf1d58c22009-06-17 13:13:00 +0200396 return ieee80211_scan_rx(rx->sdata, skb);
Zhu Yiece8edd2007-11-22 10:53:21 +0800397
Johannes Berg4080c7c2010-09-24 11:21:08 +0200398 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) {
Zhu Yiece8edd2007-11-22 10:53:21 +0800399 /* drop all the other packets during a software scan anyway */
Johannes Bergf1d58c22009-06-17 13:13:00 +0200400 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
Zhu Yiece8edd2007-11-22 10:53:21 +0800401 dev_kfree_skb(skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100402 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200403 }
404
Johannes Berg4080c7c2010-09-24 11:21:08 +0200405 /* scanning finished during invoking of handlers */
406 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
407 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200408}
409
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200410
411static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
412{
413 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
414
415 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
416 return 0;
417
418 return ieee80211_is_robust_mgmt_frame(hdr);
419}
420
421
422static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
423{
424 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
425
426 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
427 return 0;
428
429 return ieee80211_is_robust_mgmt_frame(hdr);
430}
431
432
433/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
434static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
435{
436 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
437 struct ieee80211_mmie *mmie;
438
439 if (skb->len < 24 + sizeof(*mmie) ||
440 !is_multicast_ether_addr(hdr->da))
441 return -1;
442
443 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
444 return -1; /* not a robust management frame */
445
446 mmie = (struct ieee80211_mmie *)
447 (skb->data + skb->len - sizeof(*mmie));
448 if (mmie->element_id != WLAN_EID_MMIE ||
449 mmie->length != sizeof(*mmie) - 2)
450 return -1;
451
452 return le16_to_cpu(mmie->key_id);
453}
454
455
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100456static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100457ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100458{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700459 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
460 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg47846c92009-11-25 17:46:19 +0100461 char *dev_addr = rx->sdata->vif.addr;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100462
Harvey Harrisona7767f92008-07-02 16:30:51 -0700463 if (ieee80211_is_data(hdr->frame_control)) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700464 if (is_multicast_ether_addr(hdr->addr1)) {
465 if (ieee80211_has_tods(hdr->frame_control) ||
466 !ieee80211_has_fromds(hdr->frame_control))
467 return RX_DROP_MONITOR;
468 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
469 return RX_DROP_MONITOR;
470 } else {
471 if (!ieee80211_has_a4(hdr->frame_control))
472 return RX_DROP_MONITOR;
473 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
474 return RX_DROP_MONITOR;
475 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100476 }
477
478 /* If there is not an established peer link and this is not a peer link
479 * establisment frame, beacon or probe, drop the frame.
480 */
481
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800482 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100483 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100484
Harvey Harrisona7767f92008-07-02 16:30:51 -0700485 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100486 return RX_DROP_MONITOR;
487
Harvey Harrisona7767f92008-07-02 16:30:51 -0700488 if (ieee80211_is_action(hdr->frame_control)) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100489 mgmt = (struct ieee80211_mgmt *)hdr;
Javier Cardona97ad9132010-03-29 11:00:21 -0700490 if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100491 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100492 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100493 }
494
Harvey Harrisona7767f92008-07-02 16:30:51 -0700495 if (ieee80211_is_probe_req(hdr->frame_control) ||
496 ieee80211_is_probe_resp(hdr->frame_control) ||
497 ieee80211_is_beacon(hdr->frame_control))
498 return RX_CONTINUE;
499
500 return RX_DROP_MONITOR;
501
502 }
503
504#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
505
506 if (ieee80211_is_data(hdr->frame_control) &&
507 is_multicast_ether_addr(hdr->addr1) &&
Javier Cardona3c5772a2009-08-10 12:15:48 -0700508 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100509 return RX_DROP_MONITOR;
Johannes Berg902acc72008-02-23 15:17:19 +0100510#undef msh_h_get
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100511
Johannes Berg902acc72008-02-23 15:17:19 +0100512 return RX_CONTINUE;
513}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100514
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100515#define SEQ_MODULO 0x1000
516#define SEQ_MASK 0xfff
517
518static inline int seq_less(u16 sq1, u16 sq2)
519{
520 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
521}
522
523static inline u16 seq_inc(u16 sq)
524{
525 return (sq + 1) & SEQ_MASK;
526}
527
528static inline u16 seq_sub(u16 sq1, u16 sq2)
529{
530 return (sq1 - sq2) & SEQ_MASK;
531}
532
533
534static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
535 struct tid_ampdu_rx *tid_agg_rx,
Johannes Berg2569a822009-11-25 17:46:17 +0100536 int index,
537 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100538{
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100539 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100540
541 if (!skb)
542 goto no_frame;
543
Christian Lamparter071d9ac2010-08-05 01:36:36 +0200544 /* release the frame from the reorder ring buffer */
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100545 tid_agg_rx->stored_mpdu_num--;
546 tid_agg_rx->reorder_buf[index] = NULL;
Johannes Bergd29cecd2009-12-04 14:25:43 -0800547 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100548
549no_frame:
550 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
551}
552
553static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
554 struct tid_ampdu_rx *tid_agg_rx,
Johannes Berg2569a822009-11-25 17:46:17 +0100555 u16 head_seq_num,
556 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100557{
558 int index;
559
560 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
561 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
562 tid_agg_rx->buf_size;
Johannes Berg2569a822009-11-25 17:46:17 +0100563 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100564 }
565}
566
567/*
568 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
569 * the skb was added to the buffer longer than this time ago, the earlier
570 * frames that have not yet been received are assumed to be lost and the skb
571 * can be released for processing. This may also release other skb's from the
572 * reorder buffer if there are no additional gaps between the frames.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200573 *
574 * Callers must hold tid_agg_rx->reorder_lock.
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100575 */
576#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
577
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200578static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
579 struct tid_ampdu_rx *tid_agg_rx,
580 struct sk_buff_head *frames)
581{
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200582 int index, j;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200583
584 /* release the buffer until next missing frame */
585 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
586 tid_agg_rx->buf_size;
587 if (!tid_agg_rx->reorder_buf[index] &&
588 tid_agg_rx->stored_mpdu_num > 1) {
589 /*
590 * No buffers ready to be released, but check whether any
591 * frames in the reorder buffer have timed out.
592 */
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200593 int skipped = 1;
594 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
595 j = (j + 1) % tid_agg_rx->buf_size) {
596 if (!tid_agg_rx->reorder_buf[j]) {
597 skipped++;
598 continue;
599 }
600 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
601 HT_RX_REORDER_BUF_TIMEOUT))
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200602 goto set_release_timer;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200603
604#ifdef CONFIG_MAC80211_HT_DEBUG
605 if (net_ratelimit())
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700606 wiphy_debug(hw->wiphy,
607 "release an RX reorder frame due to timeout on earlier frames\n");
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200608#endif
609 ieee80211_release_reorder_frame(hw, tid_agg_rx,
610 j, frames);
611
612 /*
613 * Increment the head seq# also for the skipped slots.
614 */
615 tid_agg_rx->head_seq_num =
616 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
617 skipped = 0;
618 }
619 } else while (tid_agg_rx->reorder_buf[index]) {
620 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
621 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
622 tid_agg_rx->buf_size;
623 }
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200624
Christian Lamparter15943a72010-10-08 22:35:09 +0200625 /*
626 * Disable the reorder release timer for now.
627 *
628 * The current implementation lacks a proper locking scheme
629 * which would protect vital statistic and debug counters
630 * from being updated by two different but concurrent BHs.
631 *
632 * More information about the topic is available from:
633 * - thread: http://marc.info/?t=128635927000001
634 *
635 * What was wrong:
636 * => http://marc.info/?l=linux-wireless&m=128636170811964
637 * "Basically the thing is that until your patch, the data
638 * in the struct didn't actually need locking because it
639 * was accessed by the RX path only which is not concurrent."
640 *
641 * List of what needs to be fixed:
642 * => http://marc.info/?l=linux-wireless&m=128656352920957
643 *
644
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200645 if (tid_agg_rx->stored_mpdu_num) {
646 j = index = seq_sub(tid_agg_rx->head_seq_num,
647 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
648
649 for (; j != (index - 1) % tid_agg_rx->buf_size;
650 j = (j + 1) % tid_agg_rx->buf_size) {
651 if (tid_agg_rx->reorder_buf[j])
652 break;
653 }
654
655 set_release_timer:
656
657 mod_timer(&tid_agg_rx->reorder_timer,
658 tid_agg_rx->reorder_time[j] +
659 HT_RX_REORDER_BUF_TIMEOUT);
660 } else {
661 del_timer(&tid_agg_rx->reorder_timer);
662 }
Christian Lamparter15943a72010-10-08 22:35:09 +0200663 */
664
665set_release_timer:
666 return;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200667}
668
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100669/*
670 * As this function belongs to the RX path it must be under
671 * rcu_read_lock protection. It returns false if the frame
672 * can be processed immediately, true if it was consumed.
673 */
674static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
675 struct tid_ampdu_rx *tid_agg_rx,
Johannes Berg2569a822009-11-25 17:46:17 +0100676 struct sk_buff *skb,
677 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100678{
679 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
680 u16 sc = le16_to_cpu(hdr->seq_ctrl);
681 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
682 u16 head_seq_num, buf_size;
683 int index;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200684 bool ret = true;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100685
686 buf_size = tid_agg_rx->buf_size;
687 head_seq_num = tid_agg_rx->head_seq_num;
688
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200689 spin_lock(&tid_agg_rx->reorder_lock);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100690 /* frame with out of date sequence number */
691 if (seq_less(mpdu_seq_num, head_seq_num)) {
692 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200693 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100694 }
695
696 /*
697 * If frame the sequence number exceeds our buffering window
698 * size release some previous frames to make room for this one.
699 */
700 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
701 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
702 /* release stored frames up to new head to stack */
Johannes Berg2569a822009-11-25 17:46:17 +0100703 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
704 frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100705 }
706
707 /* Now the new frame is always in the range of the reordering buffer */
708
709 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
710
711 /* check if we already stored this frame */
712 if (tid_agg_rx->reorder_buf[index]) {
713 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200714 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100715 }
716
717 /*
718 * If the current MPDU is in the right order and nothing else
719 * is stored we can process it directly, no need to buffer it.
720 */
721 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
722 tid_agg_rx->stored_mpdu_num == 0) {
723 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200724 ret = false;
725 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100726 }
727
728 /* put the frame in the reordering buffer */
729 tid_agg_rx->reorder_buf[index] = skb;
730 tid_agg_rx->reorder_time[index] = jiffies;
731 tid_agg_rx->stored_mpdu_num++;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200732 ieee80211_sta_reorder_release(hw, tid_agg_rx, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100733
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200734 out:
735 spin_unlock(&tid_agg_rx->reorder_lock);
736 return ret;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100737}
738
739/*
740 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
741 * true if the MPDU was buffered, false if it should be processed.
742 */
Johannes Berg2569a822009-11-25 17:46:17 +0100743static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
744 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100745{
Johannes Berg2569a822009-11-25 17:46:17 +0100746 struct sk_buff *skb = rx->skb;
747 struct ieee80211_local *local = rx->local;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100748 struct ieee80211_hw *hw = &local->hw;
749 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Johannes Berg2569a822009-11-25 17:46:17 +0100750 struct sta_info *sta = rx->sta;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100751 struct tid_ampdu_rx *tid_agg_rx;
752 u16 sc;
753 int tid;
754
755 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg2569a822009-11-25 17:46:17 +0100756 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100757
758 /*
759 * filter the QoS data rx stream according to
760 * STA/TID and check if this STA/TID is on aggregation
761 */
762
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100763 if (!sta)
Johannes Berg2569a822009-11-25 17:46:17 +0100764 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100765
766 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
767
Johannes Berga87f7362010-06-10 10:21:38 +0200768 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
769 if (!tid_agg_rx)
770 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100771
772 /* qos null data frames are excluded */
773 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Johannes Berga87f7362010-06-10 10:21:38 +0200774 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100775
776 /* new, potentially un-ordered, ampdu frame - process it */
777
778 /* reset session timer */
779 if (tid_agg_rx->timeout)
780 mod_timer(&tid_agg_rx->session_timer,
781 TU_TO_EXP_TIME(tid_agg_rx->timeout));
782
783 /* if this mpdu is fragmented - terminate rx aggregation session */
784 sc = le16_to_cpu(hdr->seq_ctrl);
785 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Bergc1475ca2010-06-10 10:21:37 +0200786 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg344eec62010-06-10 10:21:36 +0200787 skb_queue_tail(&rx->sdata->skb_queue, skb);
788 ieee80211_queue_work(&local->hw, &rx->sdata->work);
Johannes Berg2569a822009-11-25 17:46:17 +0100789 return;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100790 }
791
Johannes Berga87f7362010-06-10 10:21:38 +0200792 /*
793 * No locking needed -- we will only ever process one
794 * RX packet at a time, and thus own tid_agg_rx. All
795 * other code manipulating it needs to (and does) make
796 * sure that we cannot get to it any more before doing
797 * anything with it.
798 */
799 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
Johannes Berg2569a822009-11-25 17:46:17 +0100800 return;
801
802 dont_reorder:
803 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100804}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100805
Johannes Berg49461622008-06-30 15:10:45 +0200806static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100807ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200808{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700809 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +0200810 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200811
812 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
813 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700814 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100815 rx->sta->last_seq_ctrl[rx->queue] ==
Johannes Berg571ecf62007-07-27 15:43:22 +0200816 hdr->seq_ctrl)) {
Johannes Berg554891e2010-09-24 12:38:25 +0200817 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200818 rx->local->dot11FrameDuplicateCount++;
819 rx->sta->num_duplicates++;
820 }
Johannes Berge4c26ad2008-01-31 19:48:21 +0100821 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200822 } else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100823 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +0200824 }
825
Johannes Berg571ecf62007-07-27 15:43:22 +0200826 if (unlikely(rx->skb->len < 16)) {
827 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100828 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200829 }
830
Johannes Berg571ecf62007-07-27 15:43:22 +0200831 /* Drop disallowed frame classes based on STA auth/assoc state;
832 * IEEE 802.11, Chap 5.5.
833 *
Johannes Bergccd7b362008-09-11 00:01:56 +0200834 * mac80211 filters only based on association state, i.e. it drops
835 * Class 3 frames from not associated stations. hostapd sends
Johannes Berg571ecf62007-07-27 15:43:22 +0200836 * deauth/disassoc frames when needed. In addition, hostapd is
837 * responsible for filtering on both auth and assoc states.
838 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100839
Johannes Berg902acc72008-02-23 15:17:19 +0100840 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100841 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100842
Harvey Harrisona7767f92008-07-02 16:30:51 -0700843 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
844 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200845 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Bill Jordan1be7fe82010-10-01 11:20:41 -0400846 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
Johannes Berg07346f812008-05-03 01:02:02 +0200847 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700848 if ((!ieee80211_has_fromds(hdr->frame_control) &&
849 !ieee80211_has_tods(hdr->frame_control) &&
850 ieee80211_is_data(hdr->frame_control)) ||
Johannes Berg554891e2010-09-24 12:38:25 +0200851 !(status->rx_flags & IEEE80211_RX_RA_MATCH)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200852 /* Drop IBSS frames and frames for other hosts
853 * silently. */
Johannes Berge4c26ad2008-01-31 19:48:21 +0100854 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200855 }
856
Johannes Berge4c26ad2008-01-31 19:48:21 +0100857 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200858 }
859
Johannes Berg9ae54c82008-01-31 19:48:20 +0100860 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +0200861}
862
863
Johannes Berg49461622008-06-30 15:10:45 +0200864static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100865ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
Johannes Berg570bd532007-07-27 15:43:22 +0200866{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100867 struct sk_buff *skb = rx->skb;
868 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
869 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg3017b802007-08-28 17:01:53 -0400870 int keyidx;
871 int hdrlen;
Johannes Berge4c26ad2008-01-31 19:48:21 +0100872 ieee80211_rx_result result = RX_DROP_UNUSABLE;
Johannes Berge31b8212010-10-05 19:39:30 +0200873 struct ieee80211_key *sta_ptk = NULL;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200874 int mmie_keyidx = -1;
Johannes Berg761ab472010-05-28 14:24:19 +0200875 __le16 fc;
Johannes Berg570bd532007-07-27 15:43:22 +0200876
Johannes Berg3017b802007-08-28 17:01:53 -0400877 /*
878 * Key selection 101
879 *
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200880 * There are four types of keys:
Johannes Berg3017b802007-08-28 17:01:53 -0400881 * - GTK (group keys)
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200882 * - IGTK (group keys for management frames)
Johannes Berg3017b802007-08-28 17:01:53 -0400883 * - PTK (pairwise keys)
884 * - STK (station-to-station pairwise keys)
885 *
886 * When selecting a key, we have to distinguish between multicast
887 * (including broadcast) and unicast frames, the latter can only
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200888 * use PTKs and STKs while the former always use GTKs and IGTKs.
889 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
890 * unicast frames can also use key indices like GTKs. Hence, if we
891 * don't have a PTK/STK we check the key index for a WEP key.
Johannes Berg3017b802007-08-28 17:01:53 -0400892 *
Johannes Berg8dc06a12007-08-28 17:01:55 -0400893 * Note that in a regular BSS, multicast frames are sent by the
894 * AP only, associated stations unicast the frame to the AP first
895 * which then multicasts it on their behalf.
896 *
Johannes Berg3017b802007-08-28 17:01:53 -0400897 * There is also a slight problem in IBSS mode: GTKs are negotiated
898 * with each station, that is something we don't currently handle.
Johannes Berg8dc06a12007-08-28 17:01:55 -0400899 * The spec seems to expect that one negotiates the same key with
900 * every station but there's no such requirement; VLANs could be
901 * possible.
Johannes Berg3017b802007-08-28 17:01:53 -0400902 */
Johannes Berg571ecf62007-07-27 15:43:22 +0200903
Johannes Berg3017b802007-08-28 17:01:53 -0400904 /*
Johannes Berg1990af82007-09-26 17:53:15 +0200905 * No point in finding a key and decrypting if the frame is neither
Johannes Berg3017b802007-08-28 17:01:53 -0400906 * addressed to us nor a multicast frame.
907 */
Johannes Berg554891e2010-09-24 12:38:25 +0200908 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100909 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -0400910
Johannes Berg2569a822009-11-25 17:46:17 +0100911 /* start without a key */
912 rx->key = NULL;
913
Johannes Bergd4e46a32007-09-14 11:10:24 -0400914 if (rx->sta)
Johannes Berge31b8212010-10-05 19:39:30 +0200915 sta_ptk = rcu_dereference(rx->sta->ptk);
Johannes Bergd4e46a32007-09-14 11:10:24 -0400916
Johannes Berg761ab472010-05-28 14:24:19 +0200917 fc = hdr->frame_control;
918
919 if (!ieee80211_has_protected(fc))
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300920 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
921
Johannes Berge31b8212010-10-05 19:39:30 +0200922 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
923 rx->key = sta_ptk;
Johannes Bergdc1580d2010-08-10 09:46:40 +0200924 if ((status->flag & RX_FLAG_DECRYPTED) &&
925 (status->flag & RX_FLAG_IV_STRIPPED))
926 return RX_CONTINUE;
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300927 /* Skip decryption if the frame is not protected. */
Johannes Berg761ab472010-05-28 14:24:19 +0200928 if (!ieee80211_has_protected(fc))
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300929 return RX_CONTINUE;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200930 } else if (mmie_keyidx >= 0) {
931 /* Broadcast/multicast robust management frame / BIP */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100932 if ((status->flag & RX_FLAG_DECRYPTED) &&
933 (status->flag & RX_FLAG_IV_STRIPPED))
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200934 return RX_CONTINUE;
935
936 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
937 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
938 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
Johannes Berge31b8212010-10-05 19:39:30 +0200939 if (rx->sta)
940 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
941 if (!rx->key)
942 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
Johannes Berg761ab472010-05-28 14:24:19 +0200943 } else if (!ieee80211_has_protected(fc)) {
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300944 /*
945 * The frame was not protected, so skip decryption. However, we
946 * need to set rx->key if there is a key that could have been
947 * used so that the frame may be dropped if encryption would
948 * have been expected.
949 */
950 struct ieee80211_key *key = NULL;
Johannes Berg761ab472010-05-28 14:24:19 +0200951 if (ieee80211_is_mgmt(fc) &&
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300952 is_multicast_ether_addr(hdr->addr1) &&
953 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
954 rx->key = key;
955 else if ((key = rcu_dereference(rx->sdata->default_key)))
956 rx->key = key;
957 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200958 } else {
Zhu Yi39184b12010-04-08 15:35:10 +0800959 u8 keyid;
Johannes Berg3017b802007-08-28 17:01:53 -0400960 /*
961 * The device doesn't give us the IV so we won't be
962 * able to look up the key. That's ok though, we
963 * don't need to decrypt the frame, we just won't
964 * be able to keep statistics accurate.
965 * Except for key threshold notifications, should
966 * we somehow allow the driver to tell us which key
967 * the hardware used if this flag is set?
968 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100969 if ((status->flag & RX_FLAG_DECRYPTED) &&
970 (status->flag & RX_FLAG_IV_STRIPPED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100971 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200972
Johannes Berg761ab472010-05-28 14:24:19 +0200973 hdrlen = ieee80211_hdrlen(fc);
Johannes Berg571ecf62007-07-27 15:43:22 +0200974
Johannes Berg3017b802007-08-28 17:01:53 -0400975 if (rx->skb->len < 8 + hdrlen)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100976 return RX_DROP_UNUSABLE; /* TODO: count this? */
Johannes Berg571ecf62007-07-27 15:43:22 +0200977
Johannes Berg3017b802007-08-28 17:01:53 -0400978 /*
979 * no need to call ieee80211_wep_get_keyidx,
980 * it verifies a bunch of things we've done already
981 */
Zhu Yi39184b12010-04-08 15:35:10 +0800982 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
983 keyidx = keyid >> 6;
Johannes Berg3017b802007-08-28 17:01:53 -0400984
Johannes Berge31b8212010-10-05 19:39:30 +0200985 /* check per-station GTK first, if multicast packet */
986 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
987 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
Johannes Berg3017b802007-08-28 17:01:53 -0400988
Johannes Berge31b8212010-10-05 19:39:30 +0200989 /* if not found, try default key */
990 if (!rx->key) {
991 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
992
993 /*
994 * RSNA-protected unicast frames should always be
995 * sent with pairwise or station-to-station keys,
996 * but for WEP we allow using a key index as well.
997 */
998 if (rx->key &&
999 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1000 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1001 !is_multicast_ether_addr(hdr->addr1))
1002 rx->key = NULL;
1003 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001004 }
1005
Johannes Berg3017b802007-08-28 17:01:53 -04001006 if (rx->key) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001007 rx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -04001008 /* TODO: add threshold stuff again */
Johannes Berg1990af82007-09-26 17:53:15 +02001009 } else {
Johannes Berge4c26ad2008-01-31 19:48:21 +01001010 return RX_DROP_MONITOR;
Johannes Berg70f08762007-09-26 17:53:14 +02001011 }
1012
Zhu Yi39184b12010-04-08 15:35:10 +08001013 if (skb_linearize(rx->skb))
1014 return RX_DROP_UNUSABLE;
Johannes Berg761ab472010-05-28 14:24:19 +02001015 /* the hdr variable is invalid now! */
Johannes Berg1990af82007-09-26 17:53:15 +02001016
Johannes Berg97359d12010-08-10 09:46:38 +02001017 switch (rx->key->conf.cipher) {
1018 case WLAN_CIPHER_SUITE_WEP40:
1019 case WLAN_CIPHER_SUITE_WEP104:
Johannes Berg761ab472010-05-28 14:24:19 +02001020 /* Check for weak IVs if possible */
1021 if (rx->sta && ieee80211_is_data(fc) &&
1022 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1023 !(status->flag & RX_FLAG_DECRYPTED)) &&
1024 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1025 rx->sta->wep_weak_iv_count++;
1026
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001027 result = ieee80211_crypto_wep_decrypt(rx);
1028 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001029 case WLAN_CIPHER_SUITE_TKIP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001030 result = ieee80211_crypto_tkip_decrypt(rx);
1031 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001032 case WLAN_CIPHER_SUITE_CCMP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001033 result = ieee80211_crypto_ccmp_decrypt(rx);
1034 break;
Johannes Berg97359d12010-08-10 09:46:38 +02001035 case WLAN_CIPHER_SUITE_AES_CMAC:
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +02001036 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1037 break;
Johannes Berg3ffc2a92010-08-27 14:26:52 +03001038 default:
1039 /*
1040 * We can reach here only with HW-only algorithms
1041 * but why didn't it decrypt the frame?!
1042 */
1043 return RX_DROP_UNUSABLE;
Johannes Berg70f08762007-09-26 17:53:14 +02001044 }
1045
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001046 /* either the frame has been decrypted or will be dropped */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001047 status->flag |= RX_FLAG_DECRYPTED;
Mattias Nisslere2f036d2007-10-07 16:35:31 +02001048
1049 return result;
Johannes Berg70f08762007-09-26 17:53:14 +02001050}
1051
Kalle Valo572e0012009-02-10 17:09:31 +02001052static ieee80211_rx_result debug_noinline
1053ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1054{
1055 struct ieee80211_local *local;
1056 struct ieee80211_hdr *hdr;
1057 struct sk_buff *skb;
1058
1059 local = rx->local;
1060 skb = rx->skb;
1061 hdr = (struct ieee80211_hdr *) skb->data;
1062
1063 if (!local->pspolling)
1064 return RX_CONTINUE;
1065
1066 if (!ieee80211_has_fromds(hdr->frame_control))
1067 /* this is not from AP */
1068 return RX_CONTINUE;
1069
1070 if (!ieee80211_is_data(hdr->frame_control))
1071 return RX_CONTINUE;
1072
1073 if (!ieee80211_has_moredata(hdr->frame_control)) {
1074 /* AP has no more frames buffered for us */
1075 local->pspolling = false;
1076 return RX_CONTINUE;
1077 }
1078
1079 /* more data bit is set, let's request a new frame from the AP */
1080 ieee80211_send_pspoll(local, rx->sdata);
1081
1082 return RX_CONTINUE;
1083}
1084
Johannes Berg133b8222008-09-16 14:18:59 +02001085static void ap_sta_ps_start(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001086{
Johannes Berg133b8222008-09-16 14:18:59 +02001087 struct ieee80211_sub_if_data *sdata = sta->sdata;
Christian Lamparter4571d3b2008-11-30 00:48:41 +01001088 struct ieee80211_local *local = sdata->local;
Joe Perches0795af52007-10-03 17:59:30 -07001089
Johannes Berg3e122be2008-07-09 14:40:34 +02001090 atomic_inc(&sdata->bss->num_sta_ps);
Johannes Bergaf818582009-11-06 11:35:50 +01001091 set_sta_flags(sta, WLAN_STA_PS_STA);
Johannes Berg12375ef2009-11-25 20:30:31 +01001092 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001093#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001094 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001095 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001096#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1097}
1098
Johannes Bergff9458d2009-10-30 12:56:02 +01001099static void ap_sta_ps_end(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001100{
Johannes Berg133b8222008-09-16 14:18:59 +02001101 struct ieee80211_sub_if_data *sdata = sta->sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02001102
Johannes Berg3e122be2008-07-09 14:40:34 +02001103 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg004c8722008-02-20 11:21:35 +01001104
Johannes Bergaf818582009-11-06 11:35:50 +01001105 clear_sta_flags(sta, WLAN_STA_PS_STA);
Johannes Berg004c8722008-02-20 11:21:35 +01001106
Johannes Berg571ecf62007-07-27 15:43:22 +02001107#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001108 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001109 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001110#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg004c8722008-02-20 11:21:35 +01001111
Johannes Bergaf818582009-11-06 11:35:50 +01001112 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001113#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Bergaf818582009-11-06 11:35:50 +01001114 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001115 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001116#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Bergaf818582009-11-06 11:35:50 +01001117 return;
1118 }
1119
1120 ieee80211_sta_ps_deliver_wakeup(sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001121}
1122
Johannes Berg49461622008-06-30 15:10:45 +02001123static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001124ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001125{
1126 struct sta_info *sta = rx->sta;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001127 struct sk_buff *skb = rx->skb;
1128 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1129 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001130
1131 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001132 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001133
Johannes Bergb291ba12009-07-10 15:29:03 +02001134 /*
1135 * Update last_rx only for IBSS packets which are for the current
1136 * BSSID to avoid keeping the current IBSS network alive in cases
1137 * where other STAs start using different BSSID.
1138 */
Johannes Berg05c914f2008-09-11 00:01:58 +02001139 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001140 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +02001141 NL80211_IFTYPE_ADHOC);
Johannes Berg46900292009-02-15 12:44:28 +01001142 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
Johannes Berg571ecf62007-07-27 15:43:22 +02001143 sta->last_rx = jiffies;
Johannes Bergb291ba12009-07-10 15:29:03 +02001144 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1145 /*
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001146 * Mesh beacons will update last_rx when if they are found to
1147 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +02001148 */
Johannes Bergb291ba12009-07-10 15:29:03 +02001149 sta->last_rx = jiffies;
Johannes Berg571ecf62007-07-27 15:43:22 +02001150 }
1151
Johannes Berg554891e2010-09-24 12:38:25 +02001152 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001153 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001154
Kalle Valo3cf335d2009-03-22 21:57:06 +02001155 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1156 ieee80211_sta_rx_notify(rx->sdata, hdr);
1157
Johannes Berg571ecf62007-07-27 15:43:22 +02001158 sta->rx_fragments++;
1159 sta->rx_bytes += rx->skb->len;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001160 sta->last_signal = status->signal;
Johannes Berg571ecf62007-07-27 15:43:22 +02001161
Johannes Berg72eaa432008-11-26 15:02:58 +01001162 /*
1163 * Change STA power saving mode only at the end of a frame
1164 * exchange sequence.
1165 */
Johannes Berg3e122be2008-07-09 14:40:34 +02001166 if (!ieee80211_has_morefrags(hdr->frame_control) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001167 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1168 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
Johannes Bergaf818582009-11-06 11:35:50 +01001169 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
Johannes Berg72eaa432008-11-26 15:02:58 +01001170 /*
1171 * Ignore doze->wake transitions that are
1172 * indicated by non-data frames, the standard
1173 * is unclear here, but for example going to
1174 * PS mode and then scanning would cause a
1175 * doze->wake transition for the probe request,
1176 * and that is clearly undesirable.
1177 */
1178 if (ieee80211_is_data(hdr->frame_control) &&
1179 !ieee80211_has_pm(hdr->frame_control))
Johannes Bergff9458d2009-10-30 12:56:02 +01001180 ap_sta_ps_end(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001181 } else {
1182 if (ieee80211_has_pm(hdr->frame_control))
1183 ap_sta_ps_start(sta);
1184 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001185 }
1186
Johannes Berg22403de2009-10-30 12:55:03 +01001187 /*
1188 * Drop (qos-)data::nullfunc frames silently, since they
1189 * are used only to control station power saving mode.
1190 */
1191 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1192 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001193 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
Felix Fietkaud5242152010-01-08 18:06:26 +01001194
1195 /*
1196 * If we receive a 4-addr nullfunc frame from a STA
1197 * that was not moved to a 4-addr STA vlan yet, drop
1198 * the frame to the monitor interface, to make sure
1199 * that hostapd sees it
1200 */
1201 if (ieee80211_has_a4(hdr->frame_control) &&
1202 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1203 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1204 !rx->sdata->u.vlan.sta)))
1205 return RX_DROP_MONITOR;
Johannes Berg22403de2009-10-30 12:55:03 +01001206 /*
1207 * Update counter and free packet here to avoid
1208 * counting this as a dropped packed.
1209 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001210 sta->rx_packets++;
1211 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001212 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001213 }
1214
Johannes Berg9ae54c82008-01-31 19:48:20 +01001215 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001216} /* ieee80211_rx_h_sta_process */
1217
Johannes Berg571ecf62007-07-27 15:43:22 +02001218static inline struct ieee80211_fragment_entry *
1219ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1220 unsigned int frag, unsigned int seq, int rx_queue,
1221 struct sk_buff **skb)
1222{
1223 struct ieee80211_fragment_entry *entry;
1224 int idx;
1225
1226 idx = sdata->fragment_next;
1227 entry = &sdata->fragments[sdata->fragment_next++];
1228 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1229 sdata->fragment_next = 0;
1230
1231 if (!skb_queue_empty(&entry->skb_list)) {
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001232#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg571ecf62007-07-27 15:43:22 +02001233 struct ieee80211_hdr *hdr =
1234 (struct ieee80211_hdr *) entry->skb_list.next->data;
1235 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1236 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
Johannes Berg0c68ae262008-10-27 15:56:10 -07001237 "addr1=%pM addr2=%pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001238 sdata->name, idx,
Johannes Berg571ecf62007-07-27 15:43:22 +02001239 jiffies - entry->first_frag_time, entry->seq,
Johannes Berg0c68ae262008-10-27 15:56:10 -07001240 entry->last_frag, hdr->addr1, hdr->addr2);
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001241#endif
Johannes Berg571ecf62007-07-27 15:43:22 +02001242 __skb_queue_purge(&entry->skb_list);
1243 }
1244
1245 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1246 *skb = NULL;
1247 entry->first_frag_time = jiffies;
1248 entry->seq = seq;
1249 entry->rx_queue = rx_queue;
1250 entry->last_frag = frag;
1251 entry->ccmp = 0;
1252 entry->extra_len = 0;
1253
1254 return entry;
1255}
1256
1257static inline struct ieee80211_fragment_entry *
1258ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001259 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +02001260 int rx_queue, struct ieee80211_hdr *hdr)
1261{
1262 struct ieee80211_fragment_entry *entry;
1263 int i, idx;
1264
1265 idx = sdata->fragment_next;
1266 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1267 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +02001268
1269 idx--;
1270 if (idx < 0)
1271 idx = IEEE80211_FRAGMENT_MAX - 1;
1272
1273 entry = &sdata->fragments[idx];
1274 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1275 entry->rx_queue != rx_queue ||
1276 entry->last_frag + 1 != frag)
1277 continue;
1278
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001279 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001280
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001281 /*
1282 * Check ftype and addresses are equal, else check next fragment
1283 */
1284 if (((hdr->frame_control ^ f_hdr->frame_control) &
1285 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001286 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1287 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1288 continue;
1289
S.Çağlar Onurab466232008-02-14 17:36:47 +02001290 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001291 __skb_queue_purge(&entry->skb_list);
1292 continue;
1293 }
1294 return entry;
1295 }
1296
1297 return NULL;
1298}
1299
Johannes Berg49461622008-06-30 15:10:45 +02001300static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001301ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001302{
1303 struct ieee80211_hdr *hdr;
1304 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001305 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001306 unsigned int frag, seq;
1307 struct ieee80211_fragment_entry *entry;
1308 struct sk_buff *skb;
Johannes Berg554891e2010-09-24 12:38:25 +02001309 struct ieee80211_rx_status *status;
Johannes Berg571ecf62007-07-27 15:43:22 +02001310
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001311 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001312 fc = hdr->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02001313 sc = le16_to_cpu(hdr->seq_ctrl);
1314 frag = sc & IEEE80211_SCTL_FRAG;
1315
Harvey Harrison358c8d92008-07-15 18:44:13 -07001316 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001317 (rx->skb)->len < 24 ||
1318 is_multicast_ether_addr(hdr->addr1))) {
1319 /* not fragmented */
1320 goto out;
1321 }
1322 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1323
Zhu Yie3cf8b32010-03-29 17:35:07 +08001324 if (skb_linearize(rx->skb))
1325 return RX_DROP_UNUSABLE;
1326
Abhijeet Kolekar058897a2010-05-11 11:22:11 -07001327 /*
1328 * skb_linearize() might change the skb->data and
1329 * previously cached variables (in this case, hdr) need to
1330 * be refreshed with the new data.
1331 */
1332 hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001333 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1334
1335 if (frag == 0) {
1336 /* This is the first fragment of a new frame. */
1337 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001338 rx->queue, &(rx->skb));
Johannes Berg97359d12010-08-10 09:46:38 +02001339 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
Harvey Harrison358c8d92008-07-15 18:44:13 -07001340 ieee80211_has_protected(fc)) {
Jouni Malinen91902522010-06-11 10:27:33 -07001341 int queue = ieee80211_is_mgmt(fc) ?
1342 NUM_RX_DATA_QUEUES : rx->queue;
Johannes Berg571ecf62007-07-27 15:43:22 +02001343 /* Store CCMP PN so that we can verify that the next
1344 * fragment has a sequential PN value. */
1345 entry->ccmp = 1;
1346 memcpy(entry->last_pn,
Jouni Malinen91902522010-06-11 10:27:33 -07001347 rx->key->u.ccmp.rx_pn[queue],
Johannes Berg571ecf62007-07-27 15:43:22 +02001348 CCMP_PN_LEN);
1349 }
Johannes Berg9ae54c82008-01-31 19:48:20 +01001350 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001351 }
1352
1353 /* This is a fragment for a frame that should already be pending in
1354 * fragment cache. Add this fragment to the end of the pending entry.
1355 */
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001356 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001357 if (!entry) {
1358 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001359 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001360 }
1361
1362 /* Verify that MPDUs within one MSDU have sequential PN values.
1363 * (IEEE 802.11i, 8.3.3.4.5) */
1364 if (entry->ccmp) {
1365 int i;
1366 u8 pn[CCMP_PN_LEN], *rpn;
Jouni Malinen91902522010-06-11 10:27:33 -07001367 int queue;
Johannes Berg97359d12010-08-10 09:46:38 +02001368 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001369 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001370 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1371 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1372 pn[i]++;
1373 if (pn[i])
1374 break;
1375 }
Jouni Malinen91902522010-06-11 10:27:33 -07001376 queue = ieee80211_is_mgmt(fc) ?
1377 NUM_RX_DATA_QUEUES : rx->queue;
1378 rpn = rx->key->u.ccmp.rx_pn[queue];
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001379 if (memcmp(pn, rpn, CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001380 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001381 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1382 }
1383
Harvey Harrison358c8d92008-07-15 18:44:13 -07001384 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +02001385 __skb_queue_tail(&entry->skb_list, rx->skb);
1386 entry->last_frag = frag;
1387 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001388 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001389 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001390 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001391 }
1392
1393 rx->skb = __skb_dequeue(&entry->skb_list);
1394 if (skb_tailroom(rx->skb) < entry->extra_len) {
1395 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1396 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1397 GFP_ATOMIC))) {
1398 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1399 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001400 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001401 }
1402 }
1403 while ((skb = __skb_dequeue(&entry->skb_list))) {
1404 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1405 dev_kfree_skb(skb);
1406 }
1407
1408 /* Complete frame has been reassembled - process it now */
Johannes Berg554891e2010-09-24 12:38:25 +02001409 status = IEEE80211_SKB_RXCB(rx->skb);
1410 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001411
1412 out:
1413 if (rx->sta)
1414 rx->sta->rx_packets++;
1415 if (is_multicast_ether_addr(hdr->addr1))
1416 rx->local->dot11MulticastReceivedFrameCount++;
1417 else
1418 ieee80211_led_rx(rx->local);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001419 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001420}
1421
Johannes Berg49461622008-06-30 15:10:45 +02001422static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001423ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001424{
Johannes Bergaf818582009-11-06 11:35:50 +01001425 struct ieee80211_sub_if_data *sdata = rx->sdata;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001426 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
Johannes Berg554891e2010-09-24 12:38:25 +02001427 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001428
Harvey Harrison358c8d92008-07-15 18:44:13 -07001429 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
Johannes Berg554891e2010-09-24 12:38:25 +02001430 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001431 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001432
Johannes Berg05c914f2008-09-11 00:01:58 +02001433 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1434 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001435 return RX_DROP_UNUSABLE;
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +02001436
Johannes Bergaf818582009-11-06 11:35:50 +01001437 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1438 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1439 else
1440 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
Johannes Berg571ecf62007-07-27 15:43:22 +02001441
Johannes Berg9ae54c82008-01-31 19:48:20 +01001442 /* Free PS Poll skb here instead of returning RX_DROP that would
Johannes Berg571ecf62007-07-27 15:43:22 +02001443 * count as an dropped frame. */
1444 dev_kfree_skb(rx->skb);
1445
Johannes Berg9ae54c82008-01-31 19:48:20 +01001446 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001447}
1448
Johannes Berg49461622008-06-30 15:10:45 +02001449static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001450ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +02001451{
Johannes Berg6e0d1142007-07-27 15:43:22 +02001452 u8 *data = rx->skb->data;
Harvey Harrison238f74a2008-07-02 11:05:34 -07001453 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001454
Harvey Harrison238f74a2008-07-02 11:05:34 -07001455 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001456 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001457
1458 /* remove the qos control field, update frame type and meta-data */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001459 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1460 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1461 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001462 /* change frame type to non QOS */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001463 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001464
Johannes Berg9ae54c82008-01-31 19:48:20 +01001465 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001466}
1467
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001468static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001469ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001470{
Johannes Berg07346f812008-05-03 01:02:02 +02001471 if (unlikely(!rx->sta ||
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001472 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001473 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001474
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001475 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001476}
1477
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001478static int
Harvey Harrison358c8d92008-07-15 18:44:13 -07001479ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02001480{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001481 struct sk_buff *skb = rx->skb;
1482 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1483
Johannes Berg3017b802007-08-28 17:01:53 -04001484 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001485 * Pass through unencrypted frames if the hardware has
1486 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001487 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001488 if (status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001489 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001490
1491 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001492 if (unlikely(!ieee80211_has_protected(fc) &&
1493 !ieee80211_is_nullfunc(fc) &&
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001494 ieee80211_is_data(fc) &&
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +02001495 (rx->key || rx->sdata->drop_unencrypted)))
1496 return -EACCES;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001497
1498 return 0;
1499}
1500
1501static int
1502ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1503{
1504 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Jouni Malinene3efca02010-03-28 22:31:15 -07001505 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001506 __le16 fc = hdr->frame_control;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001507
Jouni Malinene3efca02010-03-28 22:31:15 -07001508 /*
1509 * Pass through unencrypted frames if the hardware has
1510 * decrypted them already.
1511 */
1512 if (status->flag & RX_FLAG_DECRYPTED)
1513 return 0;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001514
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001515 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
Jouni Malinend211e902010-03-28 22:29:52 -07001516 if (unlikely(!ieee80211_has_protected(fc) &&
1517 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001518 rx->key))
1519 return -EACCES;
1520 /* BIP does not use Protected field, so need to check MMIE */
Joe Perchesf64f9e72009-11-29 16:55:45 -08001521 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinenfa83a212010-03-29 23:36:15 -07001522 ieee80211_get_mmie_keyidx(rx->skb) < 0))
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001523 return -EACCES;
1524 /*
1525 * When using MFP, Action frames are not allowed prior to
1526 * having configured keys.
1527 */
1528 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1529 ieee80211_is_robust_mgmt_frame(
1530 (struct ieee80211_hdr *) rx->skb->data)))
1531 return -EACCES;
1532 }
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001533
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001534 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001535}
1536
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001537static int
Zhu Yie31a16d2009-05-21 21:47:03 +08001538__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001539{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001540 struct ieee80211_sub_if_data *sdata = rx->sdata;
Felix Fietkauf14543e2009-11-10 20:10:05 +01001541 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1542
Johannes Berg9bc383d2009-11-19 11:55:19 +01001543 if (ieee80211_has_a4(hdr->frame_control) &&
1544 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
Felix Fietkauf14543e2009-11-10 20:10:05 +01001545 return -1;
Johannes Berg9bc383d2009-11-19 11:55:19 +01001546
1547 if (is_multicast_ether_addr(hdr->addr1) &&
1548 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1549 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
Felix Fietkauf14543e2009-11-10 20:10:05 +01001550 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001551
Johannes Berg47846c92009-11-25 17:46:19 +01001552 return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001553}
Johannes Berg571ecf62007-07-27 15:43:22 +02001554
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001555/*
1556 * requires that rx->skb is a frame with ethernet header
1557 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001558static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001559{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301560 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001561 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1562 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1563
1564 /*
1565 * Allow EAPOL frames to us/the PAE group address regardless
1566 * of whether the frame was encrypted or not.
1567 */
Johannes Berga621fa42010-08-27 14:26:54 +03001568 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
Johannes Berg47846c92009-11-25 17:46:19 +01001569 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001570 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1571 return true;
1572
1573 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07001574 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001575 return false;
1576
1577 return true;
1578}
1579
1580/*
1581 * requires that rx->skb is a frame with ethernet header
1582 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001583static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01001584ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001585{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001586 struct ieee80211_sub_if_data *sdata = rx->sdata;
1587 struct net_device *dev = sdata->dev;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001588 struct sk_buff *skb, *xmit_skb;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001589 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1590 struct sta_info *dsta;
Johannes Berg554891e2010-09-24 12:38:25 +02001591 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001592
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001593 skb = rx->skb;
1594 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001595
Johannes Berg05c914f2008-09-11 00:01:58 +02001596 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1597 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02001598 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg554891e2010-09-24 12:38:25 +02001599 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
Johannes Berg9bc383d2009-11-19 11:55:19 +01001600 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001601 if (is_multicast_ether_addr(ehdr->h_dest)) {
1602 /*
1603 * send multicast frames both to higher layers in
1604 * local net stack and back to the wireless medium
1605 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001606 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1607 if (!xmit_skb && net_ratelimit())
Johannes Berg571ecf62007-07-27 15:43:22 +02001608 printk(KERN_DEBUG "%s: failed to clone "
1609 "multicast frame\n", dev->name);
1610 } else {
Johannes Bergabe60632009-11-25 17:46:18 +01001611 dsta = sta_info_get(sdata, skb->data);
1612 if (dsta) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001613 /*
1614 * The destination station is associated to
1615 * this AP (in this VLAN), so send the frame
1616 * directly to it and do not pass it to local
1617 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02001618 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001619 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001620 skb = NULL;
1621 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001622 }
1623 }
1624
1625 if (skb) {
Johannes Bergd1c3a372009-01-07 00:26:10 +01001626 int align __maybe_unused;
1627
Kalle Valo59d9cb02009-12-17 13:54:57 +01001628#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
Johannes Bergd1c3a372009-01-07 00:26:10 +01001629 /*
1630 * 'align' will only take the values 0 or 2 here
1631 * since all frames are required to be aligned
1632 * to 2-byte boundaries when being passed to
1633 * mac80211. That also explains the __skb_push()
1634 * below.
1635 */
matthieu castetdacb6f12009-06-04 22:16:18 +02001636 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01001637 if (align) {
1638 if (WARN_ON(skb_headroom(skb) < 3)) {
1639 dev_kfree_skb(skb);
1640 skb = NULL;
1641 } else {
1642 u8 *data = skb->data;
Zhu Yi8ce0b582009-10-28 13:13:52 -07001643 size_t len = skb_headlen(skb);
1644 skb->data -= align;
1645 memmove(skb->data, data, len);
1646 skb_set_tail_pointer(skb, len);
Johannes Bergd1c3a372009-01-07 00:26:10 +01001647 }
1648 }
1649#endif
1650
1651 if (skb) {
1652 /* deliver to local stack */
1653 skb->protocol = eth_type_trans(skb, dev);
1654 memset(skb->cb, 0, sizeof(skb->cb));
John W. Linville5548a8a2010-06-24 14:25:56 -04001655 netif_receive_skb(skb);
Johannes Bergd1c3a372009-01-07 00:26:10 +01001656 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001657 }
1658
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001659 if (xmit_skb) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001660 /* send to wireless media */
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09001661 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001662 skb_reset_network_header(xmit_skb);
1663 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001664 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001665 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001666}
1667
Johannes Berg49461622008-06-30 15:10:45 +02001668static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001669ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001670{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001671 struct net_device *dev = rx->sdata->dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001672 struct sk_buff *skb = rx->skb;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001673 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1674 __le16 fc = hdr->frame_control;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001675 struct sk_buff_head frame_list;
Johannes Berg554891e2010-09-24 12:38:25 +02001676 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001677
Harvey Harrison358c8d92008-07-15 18:44:13 -07001678 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001679 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001680
Harvey Harrison358c8d92008-07-15 18:44:13 -07001681 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001682 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001683
Johannes Berg554891e2010-09-24 12:38:25 +02001684 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001685 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001686
Zhu Yieaf85ca2009-12-01 10:18:37 +08001687 if (ieee80211_has_a4(hdr->frame_control) &&
1688 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1689 !rx->sdata->u.vlan.sta)
1690 return RX_DROP_UNUSABLE;
1691
1692 if (is_multicast_ether_addr(hdr->addr1) &&
1693 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1694 rx->sdata->u.vlan.sta) ||
1695 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1696 rx->sdata->u.mgd.use_4addr)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001697 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001698
1699 skb->dev = dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001700 __skb_queue_head_init(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001701
Zhu Yie3cf8b32010-03-29 17:35:07 +08001702 if (skb_linearize(skb))
1703 return RX_DROP_UNUSABLE;
1704
Zhu Yieaf85ca2009-12-01 10:18:37 +08001705 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1706 rx->sdata->vif.type,
1707 rx->local->hw.extra_tx_headroom);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001708
Zhu Yieaf85ca2009-12-01 10:18:37 +08001709 while (!skb_queue_empty(&frame_list)) {
1710 rx->skb = __skb_dequeue(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001711
Harvey Harrison358c8d92008-07-15 18:44:13 -07001712 if (!ieee80211_frame_allowed(rx, fc)) {
Zhu Yieaf85ca2009-12-01 10:18:37 +08001713 dev_kfree_skb(rx->skb);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001714 continue;
1715 }
Zhu Yieaf85ca2009-12-01 10:18:37 +08001716 dev->stats.rx_packets++;
1717 dev->stats.rx_bytes += rx->skb->len;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001718
1719 ieee80211_deliver_skb(rx);
1720 }
1721
Johannes Berg9ae54c82008-01-31 19:48:20 +01001722 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001723}
1724
Ingo Molnarbf94e172008-10-12 23:51:38 -07001725#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02001726static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001727ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1728{
1729 struct ieee80211_hdr *hdr;
1730 struct ieee80211s_hdr *mesh_hdr;
1731 unsigned int hdrlen;
1732 struct sk_buff *skb = rx->skb, *fwd_skb;
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001733 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001734 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02001735 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001736
1737 hdr = (struct ieee80211_hdr *) skb->data;
1738 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1739 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1740
1741 if (!ieee80211_is_data(hdr->frame_control))
1742 return RX_CONTINUE;
1743
1744 if (!mesh_hdr->ttl)
1745 /* illegal frame */
1746 return RX_DROP_MONITOR;
1747
Javier Cardona43b7b312009-10-15 18:10:51 -07001748 if (mesh_hdr->flags & MESH_FLAGS_AE) {
YanBo79617de2008-09-22 13:30:32 +08001749 struct mesh_path *mppath;
Javier Cardona43b7b312009-10-15 18:10:51 -07001750 char *proxied_addr;
1751 char *mpp_addr;
1752
1753 if (is_multicast_ether_addr(hdr->addr1)) {
1754 mpp_addr = hdr->addr3;
1755 proxied_addr = mesh_hdr->eaddr1;
1756 } else {
1757 mpp_addr = hdr->addr4;
1758 proxied_addr = mesh_hdr->eaddr2;
1759 }
YanBo79617de2008-09-22 13:30:32 +08001760
YanBo79617de2008-09-22 13:30:32 +08001761 rcu_read_lock();
Javier Cardona43b7b312009-10-15 18:10:51 -07001762 mppath = mpp_path_lookup(proxied_addr, sdata);
YanBo79617de2008-09-22 13:30:32 +08001763 if (!mppath) {
Javier Cardona43b7b312009-10-15 18:10:51 -07001764 mpp_path_add(proxied_addr, mpp_addr, sdata);
YanBo79617de2008-09-22 13:30:32 +08001765 } else {
1766 spin_lock_bh(&mppath->state_lock);
Javier Cardona43b7b312009-10-15 18:10:51 -07001767 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1768 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
YanBo79617de2008-09-22 13:30:32 +08001769 spin_unlock_bh(&mppath->state_lock);
1770 }
1771 rcu_read_unlock();
1772 }
1773
Javier Cardona3c5772a2009-08-10 12:15:48 -07001774 /* Frame has reached destination. Don't forward */
1775 if (!is_multicast_ether_addr(hdr->addr1) &&
Johannes Berg47846c92009-11-25 17:46:19 +01001776 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001777 return RX_CONTINUE;
1778
1779 mesh_hdr->ttl--;
1780
Johannes Berg554891e2010-09-24 12:38:25 +02001781 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001782 if (!mesh_hdr->ttl)
Johannes Berg472dbc42008-09-11 00:01:49 +02001783 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001784 dropped_frames_ttl);
1785 else {
1786 struct ieee80211_hdr *fwd_hdr;
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001787 struct ieee80211_tx_info *info;
1788
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001789 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1790
Johannes Bergb51aff02010-12-22 10:15:07 +01001791 if (!fwd_skb && net_ratelimit()) {
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001792 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001793 sdata->name);
Johannes Bergb51aff02010-12-22 10:15:07 +01001794 goto out;
1795 }
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001796
1797 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
Johannes Berg47846c92009-11-25 17:46:19 +01001798 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001799 info = IEEE80211_SKB_CB(fwd_skb);
1800 memset(info, 0, sizeof(*info));
1801 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
Johannes Berg5061b0c2009-07-14 00:33:34 +02001802 info->control.vif = &rx->sdata->vif;
Johannes Bergcf0277e2010-01-05 18:00:58 +01001803 skb_set_queue_mapping(skb,
1804 ieee80211_select_queue(rx->sdata, fwd_skb));
1805 ieee80211_set_qos_hdr(local, skb);
Daniel Walkerc8a61a72009-08-18 10:59:00 -07001806 if (is_multicast_ether_addr(fwd_hdr->addr1))
1807 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1808 fwded_mcast);
1809 else {
Javier Cardona3c5772a2009-08-10 12:15:48 -07001810 int err;
1811 /*
1812 * Save TA to addr1 to send TA a path error if a
1813 * suitable next hop is not found
1814 */
1815 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
Javier Cardona249b4052009-07-07 10:55:03 -07001816 ETH_ALEN);
Javier Cardona3c5772a2009-08-10 12:15:48 -07001817 err = mesh_nexthop_lookup(fwd_skb, sdata);
Javier Cardona249b4052009-07-07 10:55:03 -07001818 /* Failed to immediately resolve next hop:
1819 * fwded frame was dropped or will be added
1820 * later to the pending skb queue. */
1821 if (err)
1822 return RX_DROP_MONITOR;
Daniel Walkerc8a61a72009-08-18 10:59:00 -07001823
1824 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1825 fwded_unicast);
Javier Cardona249b4052009-07-07 10:55:03 -07001826 }
1827 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1828 fwded_frames);
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001829 ieee80211_add_pending_skb(local, fwd_skb);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001830 }
1831 }
1832
Johannes Bergb51aff02010-12-22 10:15:07 +01001833 out:
Javier Cardona3c5772a2009-08-10 12:15:48 -07001834 if (is_multicast_ether_addr(hdr->addr1) ||
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001835 sdata->dev->flags & IFF_PROMISC)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001836 return RX_CONTINUE;
1837 else
1838 return RX_DROP_MONITOR;
1839}
Ingo Molnarbf94e172008-10-12 23:51:38 -07001840#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001841
1842static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001843ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001844{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001845 struct ieee80211_sub_if_data *sdata = rx->sdata;
Vivek Natarajane15276a2010-02-08 17:47:01 +05301846 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001847 struct net_device *dev = sdata->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001848 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1849 __le16 fc = hdr->frame_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001850 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001851
Harvey Harrison358c8d92008-07-15 18:44:13 -07001852 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001853 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001854
Harvey Harrison358c8d92008-07-15 18:44:13 -07001855 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001856 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001857
Felix Fietkauf14543e2009-11-10 20:10:05 +01001858 /*
1859 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1860 * that a 4-addr station can be detected and moved into a separate VLAN
1861 */
1862 if (ieee80211_has_a4(hdr->frame_control) &&
1863 sdata->vif.type == NL80211_IFTYPE_AP)
1864 return RX_DROP_MONITOR;
1865
Zhu Yie31a16d2009-05-21 21:47:03 +08001866 err = __ieee80211_data_to_8023(rx);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001867 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001868 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001869
Harvey Harrison358c8d92008-07-15 18:44:13 -07001870 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001871 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001872
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001873 rx->skb->dev = dev;
1874
1875 dev->stats.rx_packets++;
1876 dev->stats.rx_bytes += rx->skb->len;
1877
Vivek Natarajane15276a2010-02-08 17:47:01 +05301878 if (ieee80211_is_data(hdr->frame_control) &&
1879 !is_multicast_ether_addr(hdr->addr1) &&
1880 local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) {
1881 mod_timer(&local->dynamic_ps_timer, jiffies +
1882 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1883 }
1884
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001885 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02001886
Johannes Berg9ae54c82008-01-31 19:48:20 +01001887 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001888}
1889
Johannes Berg49461622008-06-30 15:10:45 +02001890static ieee80211_rx_result debug_noinline
Johannes Berg2569a822009-11-25 17:46:17 +01001891ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
Ron Rindjunsky71364712007-12-25 17:00:36 +02001892{
1893 struct ieee80211_local *local = rx->local;
1894 struct ieee80211_hw *hw = &local->hw;
1895 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07001896 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001897 struct tid_ampdu_rx *tid_agg_rx;
1898 u16 start_seq_num;
1899 u16 tid;
1900
Harvey Harrisona7767f92008-07-02 16:30:51 -07001901 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001902 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001903
Harvey Harrisona7767f92008-07-02 16:30:51 -07001904 if (ieee80211_is_back_req(bar->frame_control)) {
Johannes Berg8ae59772010-05-30 14:52:58 +02001905 struct {
1906 __le16 control, start_seq_num;
1907 } __packed bar_data;
1908
Ron Rindjunsky71364712007-12-25 17:00:36 +02001909 if (!rx->sta)
Johannes Berga02ae752009-11-16 12:00:40 +01001910 return RX_DROP_MONITOR;
Johannes Berg8ae59772010-05-30 14:52:58 +02001911
1912 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1913 &bar_data, sizeof(bar_data)))
1914 return RX_DROP_MONITOR;
1915
Johannes Berg8ae59772010-05-30 14:52:58 +02001916 tid = le16_to_cpu(bar_data.control) >> 12;
Johannes Berga87f7362010-06-10 10:21:38 +02001917
1918 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1919 if (!tid_agg_rx)
Johannes Berga02ae752009-11-16 12:00:40 +01001920 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001921
Johannes Berg8ae59772010-05-30 14:52:58 +02001922 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001923
1924 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01001925 if (tid_agg_rx->timeout)
1926 mod_timer(&tid_agg_rx->session_timer,
1927 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02001928
Johannes Berga02ae752009-11-16 12:00:40 +01001929 /* release stored frames up to start of BAR */
Johannes Berg2569a822009-11-25 17:46:17 +01001930 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1931 frames);
Johannes Berga02ae752009-11-16 12:00:40 +01001932 kfree_skb(skb);
1933 return RX_QUEUED;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001934 }
1935
Johannes Berg08daeca2010-05-30 14:53:43 +02001936 /*
1937 * After this point, we only want management frames,
1938 * so we can drop all remaining control frames to
1939 * cooked monitor interfaces.
1940 */
1941 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001942}
1943
Jouni Malinenf4f727a2009-01-10 11:46:53 +02001944static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1945 struct ieee80211_mgmt *mgmt,
1946 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02001947{
1948 struct ieee80211_local *local = sdata->local;
1949 struct sk_buff *skb;
1950 struct ieee80211_mgmt *resp;
1951
Johannes Berg47846c92009-11-25 17:46:19 +01001952 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
Jouni Malinenfea14732009-01-08 13:32:06 +02001953 /* Not to own unicast address */
1954 return;
1955 }
1956
Johannes Berg46900292009-02-15 12:44:28 +01001957 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1958 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
Johannes Berg77fdaa12009-07-07 03:45:17 +02001959 /* Not from the current AP or not associated yet. */
Jouni Malinenfea14732009-01-08 13:32:06 +02001960 return;
1961 }
1962
1963 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1964 /* Too short SA Query request frame */
1965 return;
1966 }
1967
1968 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1969 if (skb == NULL)
1970 return;
1971
1972 skb_reserve(skb, local->hw.extra_tx_headroom);
1973 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1974 memset(resp, 0, 24);
1975 memcpy(resp->da, mgmt->sa, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01001976 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01001977 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02001978 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1979 IEEE80211_STYPE_ACTION);
1980 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1981 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1982 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1983 memcpy(resp->u.action.u.sa_query.trans_id,
1984 mgmt->u.action.u.sa_query.trans_id,
1985 WLAN_SA_QUERY_TR_ID_LEN);
1986
Johannes Berg62ae67b2009-11-18 18:42:05 +01001987 ieee80211_tx_skb(sdata, skb);
Jouni Malinenfea14732009-01-08 13:32:06 +02001988}
1989
Johannes Berg49461622008-06-30 15:10:45 +02001990static ieee80211_rx_result debug_noinline
Johannes Berg2e161f72010-08-12 15:38:38 +02001991ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
1992{
1993 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02001994 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02001995
1996 /*
1997 * From here on, look only at management frames.
1998 * Data and control frames are already handled,
1999 * and unknown (reserved) frames are useless.
2000 */
2001 if (rx->skb->len < 24)
2002 return RX_DROP_MONITOR;
2003
2004 if (!ieee80211_is_mgmt(mgmt->frame_control))
2005 return RX_DROP_MONITOR;
2006
Johannes Berg554891e2010-09-24 12:38:25 +02002007 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg2e161f72010-08-12 15:38:38 +02002008 return RX_DROP_MONITOR;
2009
2010 if (ieee80211_drop_unencrypted_mgmt(rx))
2011 return RX_DROP_UNUSABLE;
2012
2013 return RX_CONTINUE;
2014}
2015
2016static ieee80211_rx_result debug_noinline
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002017ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2018{
2019 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002020 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002021 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002022 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002023 int len = rx->skb->len;
2024
2025 if (!ieee80211_is_action(mgmt->frame_control))
2026 return RX_CONTINUE;
2027
Jouni Malinen026331c2010-02-15 12:53:10 +02002028 /* drop too small frames */
2029 if (len < IEEE80211_MIN_ACTION_SIZE)
2030 return RX_DROP_UNUSABLE;
2031
2032 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
Johannes Berg84040802010-02-15 12:46:39 +02002033 return RX_DROP_UNUSABLE;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002034
Johannes Berg554891e2010-09-24 12:38:25 +02002035 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
Johannes Berg84040802010-02-15 12:46:39 +02002036 return RX_DROP_UNUSABLE;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002037
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002038 switch (mgmt->u.action.category) {
2039 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01002040 /*
2041 * The aggregation code is not prepared to handle
2042 * anything but STA/AP due to the BSSID handling;
2043 * IBSS could work in the code but isn't supported
2044 * by drivers or the standard.
2045 */
2046 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2047 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2048 sdata->vif.type != NL80211_IFTYPE_AP)
Johannes Berg84040802010-02-15 12:46:39 +02002049 break;
Johannes Berg8abd3f92009-02-10 21:25:47 +01002050
Jouni Malinen026331c2010-02-15 12:53:10 +02002051 /* verify action_code is present */
2052 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2053 break;
2054
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002055 switch (mgmt->u.action.u.addba_req.action_code) {
2056 case WLAN_ACTION_ADDBA_REQ:
2057 if (len < (IEEE80211_MIN_ACTION_SIZE +
2058 sizeof(mgmt->u.action.u.addba_req)))
Johannes Bergbed7ee62010-06-10 10:21:35 +02002059 goto invalid;
2060 break;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002061 case WLAN_ACTION_ADDBA_RESP:
2062 if (len < (IEEE80211_MIN_ACTION_SIZE +
2063 sizeof(mgmt->u.action.u.addba_resp)))
Johannes Bergbed7ee62010-06-10 10:21:35 +02002064 goto invalid;
2065 break;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002066 case WLAN_ACTION_DELBA:
2067 if (len < (IEEE80211_MIN_ACTION_SIZE +
2068 sizeof(mgmt->u.action.u.delba)))
Johannes Bergbed7ee62010-06-10 10:21:35 +02002069 goto invalid;
2070 break;
2071 default:
2072 goto invalid;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002073 }
Johannes Bergbed7ee62010-06-10 10:21:35 +02002074
Johannes Berg8b58ff82010-06-10 10:21:51 +02002075 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002076 case WLAN_CATEGORY_SPECTRUM_MGMT:
2077 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
Johannes Berg84040802010-02-15 12:46:39 +02002078 break;
Johannes Berg46900292009-02-15 12:44:28 +01002079
2080 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002081 break;
Johannes Berg46900292009-02-15 12:44:28 +01002082
Jouni Malinen026331c2010-02-15 12:53:10 +02002083 /* verify action_code is present */
2084 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2085 break;
2086
Johannes Berg39192c02008-09-09 14:49:03 +02002087 switch (mgmt->u.action.u.measurement.action_code) {
2088 case WLAN_ACTION_SPCT_MSR_REQ:
2089 if (len < (IEEE80211_MIN_ACTION_SIZE +
2090 sizeof(mgmt->u.action.u.measurement)))
Johannes Berg84040802010-02-15 12:46:39 +02002091 break;
Johannes Berg39192c02008-09-09 14:49:03 +02002092 ieee80211_process_measurement_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002093 goto handled;
Sujithc481ec92009-01-06 09:28:37 +05302094 case WLAN_ACTION_SPCT_CHL_SWITCH:
2095 if (len < (IEEE80211_MIN_ACTION_SIZE +
2096 sizeof(mgmt->u.action.u.chan_switch)))
Johannes Berg84040802010-02-15 12:46:39 +02002097 break;
Sujithc481ec92009-01-06 09:28:37 +05302098
Johannes Bergcc32abd2009-05-15 11:52:31 +02002099 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002100 break;
Johannes Bergcc32abd2009-05-15 11:52:31 +02002101
Johannes Berg46900292009-02-15 12:44:28 +01002102 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
Johannes Berg84040802010-02-15 12:46:39 +02002103 break;
Sujithc481ec92009-01-06 09:28:37 +05302104
Johannes Berg8b58ff82010-06-10 10:21:51 +02002105 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002106 }
2107 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002108 case WLAN_CATEGORY_SA_QUERY:
2109 if (len < (IEEE80211_MIN_ACTION_SIZE +
2110 sizeof(mgmt->u.action.u.sa_query)))
Johannes Berg84040802010-02-15 12:46:39 +02002111 break;
2112
Jouni Malinenfea14732009-01-08 13:32:06 +02002113 switch (mgmt->u.action.u.sa_query.action) {
2114 case WLAN_ACTION_SA_QUERY_REQUEST:
2115 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002116 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002117 ieee80211_process_sa_query_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002118 goto handled;
Jouni Malinenfea14732009-01-08 13:32:06 +02002119 }
2120 break;
Javier Cardona97ad9132010-03-29 11:00:21 -07002121 case WLAN_CATEGORY_MESH_PLINK:
2122 case WLAN_CATEGORY_MESH_PATH_SEL:
Johannes Berg77a121c2010-06-10 10:21:34 +02002123 if (!ieee80211_vif_is_mesh(&sdata->vif))
2124 break;
Johannes Berg8b58ff82010-06-10 10:21:51 +02002125 goto queue;
Johannes Berg84040802010-02-15 12:46:39 +02002126 }
Jouni Malinen026331c2010-02-15 12:53:10 +02002127
Johannes Berg2e161f72010-08-12 15:38:38 +02002128 return RX_CONTINUE;
2129
Johannes Bergbed7ee62010-06-10 10:21:35 +02002130 invalid:
Johannes Berg554891e2010-09-24 12:38:25 +02002131 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
Johannes Berg2e161f72010-08-12 15:38:38 +02002132 /* will return in the next handlers */
2133 return RX_CONTINUE;
2134
2135 handled:
2136 if (rx->sta)
2137 rx->sta->rx_packets++;
2138 dev_kfree_skb(rx->skb);
2139 return RX_QUEUED;
2140
2141 queue:
2142 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2143 skb_queue_tail(&sdata->skb_queue, rx->skb);
2144 ieee80211_queue_work(&local->hw, &sdata->work);
2145 if (rx->sta)
2146 rx->sta->rx_packets++;
2147 return RX_QUEUED;
2148}
2149
2150static ieee80211_rx_result debug_noinline
2151ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2152{
Johannes Berg554891e2010-09-24 12:38:25 +02002153 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002154
2155 /* skip known-bad action frames and return them in the next handler */
Johannes Berg554891e2010-09-24 12:38:25 +02002156 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
Johannes Berg2e161f72010-08-12 15:38:38 +02002157 return RX_CONTINUE;
Felix Fietkaud7907442010-01-07 20:23:53 +01002158
Jouni Malinen026331c2010-02-15 12:53:10 +02002159 /*
2160 * Getting here means the kernel doesn't know how to handle
2161 * it, but maybe userspace does ... include returned frames
2162 * so userspace can register for those to know whether ones
2163 * it transmitted were processed or returned.
2164 */
Jouni Malinen026331c2010-02-15 12:53:10 +02002165
Johannes Berg2e161f72010-08-12 15:38:38 +02002166 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2167 rx->skb->data, rx->skb->len,
2168 GFP_ATOMIC)) {
2169 if (rx->sta)
2170 rx->sta->rx_packets++;
2171 dev_kfree_skb(rx->skb);
2172 return RX_QUEUED;
2173 }
2174
2175
2176 return RX_CONTINUE;
2177}
2178
2179static ieee80211_rx_result debug_noinline
2180ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2181{
2182 struct ieee80211_local *local = rx->local;
2183 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2184 struct sk_buff *nskb;
2185 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02002186 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002187
2188 if (!ieee80211_is_action(mgmt->frame_control))
2189 return RX_CONTINUE;
2190
2191 /*
2192 * For AP mode, hostapd is responsible for handling any action
2193 * frames that we didn't handle, including returning unknown
2194 * ones. For all other modes we will return them to the sender,
2195 * setting the 0x80 bit in the action category, as required by
2196 * 802.11-2007 7.3.1.11.
2197 * Newer versions of hostapd shall also use the management frame
2198 * registration mechanisms, but older ones still use cooked
2199 * monitor interfaces so push all frames there.
2200 */
Johannes Berg554891e2010-09-24 12:38:25 +02002201 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
Johannes Berg2e161f72010-08-12 15:38:38 +02002202 (sdata->vif.type == NL80211_IFTYPE_AP ||
2203 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2204 return RX_DROP_MONITOR;
Jouni Malinen026331c2010-02-15 12:53:10 +02002205
Johannes Berg84040802010-02-15 12:46:39 +02002206 /* do not return rejected action frames */
2207 if (mgmt->u.action.category & 0x80)
2208 return RX_DROP_UNUSABLE;
2209
2210 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2211 GFP_ATOMIC);
2212 if (nskb) {
John W. Linville292b4df2010-06-24 11:13:56 -04002213 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
Johannes Berg84040802010-02-15 12:46:39 +02002214
John W. Linville292b4df2010-06-24 11:13:56 -04002215 nmgmt->u.action.category |= 0x80;
2216 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2217 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
Johannes Berg84040802010-02-15 12:46:39 +02002218
2219 memset(nskb->cb, 0, sizeof(nskb->cb));
2220
2221 ieee80211_tx_skb(rx->sdata, nskb);
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002222 }
Johannes Berg39192c02008-09-09 14:49:03 +02002223 dev_kfree_skb(rx->skb);
2224 return RX_QUEUED;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002225}
2226
2227static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002228ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02002229{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002230 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergaf6b6372009-12-23 13:15:35 +01002231 ieee80211_rx_result rxs;
Johannes Berg77a121c2010-06-10 10:21:34 +02002232 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2233 __le16 stype;
Johannes Berg571ecf62007-07-27 15:43:22 +02002234
Johannes Bergaf6b6372009-12-23 13:15:35 +01002235 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2236 if (rxs != RX_CONTINUE)
2237 return rxs;
2238
Johannes Berg77a121c2010-06-10 10:21:34 +02002239 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
Johannes Berg472dbc42008-09-11 00:01:49 +02002240
Johannes Berg77a121c2010-06-10 10:21:34 +02002241 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2242 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2243 sdata->vif.type != NL80211_IFTYPE_STATION)
2244 return RX_DROP_MONITOR;
Johannes Bergf9d540e2007-09-28 14:02:09 +02002245
Johannes Berg77a121c2010-06-10 10:21:34 +02002246 switch (stype) {
2247 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2248 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2249 /* process for all: mesh, mlme, ibss */
2250 break;
2251 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2252 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
Christian Lamparter2c313332010-11-29 20:53:23 +01002253 if (is_multicast_ether_addr(mgmt->da) &&
2254 !is_broadcast_ether_addr(mgmt->da))
2255 return RX_DROP_MONITOR;
2256
Johannes Berg77a121c2010-06-10 10:21:34 +02002257 /* process only for station */
2258 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2259 return RX_DROP_MONITOR;
2260 break;
2261 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2262 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2263 /* process only for ibss */
2264 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2265 return RX_DROP_MONITOR;
2266 break;
2267 default:
2268 return RX_DROP_MONITOR;
2269 }
Johannes Berg46900292009-02-15 12:44:28 +01002270
Johannes Berg77a121c2010-06-10 10:21:34 +02002271 /* queue up frame and kick off work to process it */
Johannes Bergc1475ca2010-06-10 10:21:37 +02002272 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg77a121c2010-06-10 10:21:34 +02002273 skb_queue_tail(&sdata->skb_queue, rx->skb);
2274 ieee80211_queue_work(&rx->local->hw, &sdata->work);
Johannes Berg8b58ff82010-06-10 10:21:51 +02002275 if (rx->sta)
2276 rx->sta->rx_packets++;
Johannes Berg77a121c2010-06-10 10:21:34 +02002277
2278 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002279}
2280
Johannes Berg3b8d81e2009-06-17 17:43:56 +02002281static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
Johannes Berg5cf121c2008-02-25 16:27:43 +01002282 struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02002283{
Harvey Harrisona7767f92008-07-02 16:30:51 -07002284 int keyidx;
2285 unsigned int hdrlen;
Johannes Berg571ecf62007-07-27 15:43:22 +02002286
Harvey Harrisona7767f92008-07-02 16:30:51 -07002287 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +02002288 if (rx->skb->len >= hdrlen + 4)
2289 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2290 else
2291 keyidx = -1;
2292
Johannes Berg8944b792008-01-31 19:48:26 +01002293 if (!rx->sta) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02002294 /*
2295 * Some hardware seem to generate incorrect Michael MIC
2296 * reports; ignore them to avoid triggering countermeasures.
2297 */
Johannes Bergaf2ced62009-11-16 12:00:39 +01002298 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002299 }
2300
Harvey Harrisona7767f92008-07-02 16:30:51 -07002301 if (!ieee80211_has_protected(hdr->frame_control))
Johannes Bergaf2ced62009-11-16 12:00:39 +01002302 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002303
Johannes Berg05c914f2008-09-11 00:01:58 +02002304 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02002305 /*
2306 * APs with pairwise keys should never receive Michael MIC
2307 * errors for non-zero keyidx because these are reserved for
2308 * group keys and only the AP is sending real multicast
2309 * frames in the BSS.
2310 */
Johannes Bergaf2ced62009-11-16 12:00:39 +01002311 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002312 }
2313
Harvey Harrisona7767f92008-07-02 16:30:51 -07002314 if (!ieee80211_is_data(hdr->frame_control) &&
2315 !ieee80211_is_auth(hdr->frame_control))
Johannes Bergaf2ced62009-11-16 12:00:39 +01002316 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002317
Johannes Berge6d6e342009-07-01 21:26:47 +02002318 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2319 GFP_ATOMIC);
Johannes Berg571ecf62007-07-27 15:43:22 +02002320}
2321
Johannes Berg5cf121c2008-02-25 16:27:43 +01002322/* TODO: use IEEE80211_RX_FRAGMENTED */
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002323static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2324 struct ieee80211_rate *rate)
Michael Wu3d30d942008-01-31 19:48:27 +01002325{
2326 struct ieee80211_sub_if_data *sdata;
2327 struct ieee80211_local *local = rx->local;
2328 struct ieee80211_rtap_hdr {
2329 struct ieee80211_radiotap_header hdr;
2330 u8 flags;
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002331 u8 rate_or_pad;
Michael Wu3d30d942008-01-31 19:48:27 +01002332 __le16 chan_freq;
2333 __le16 chan_flags;
Eric Dumazetbc105022010-06-03 03:21:52 -07002334 } __packed *rthdr;
Michael Wu3d30d942008-01-31 19:48:27 +01002335 struct sk_buff *skb = rx->skb, *skb2;
2336 struct net_device *prev_dev = NULL;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002337 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Michael Wu3d30d942008-01-31 19:48:27 +01002338
Johannes Berg554891e2010-09-24 12:38:25 +02002339 /*
2340 * If cooked monitor has been processed already, then
2341 * don't do it again. If not, set the flag.
2342 */
2343 if (rx->flags & IEEE80211_RX_CMNTR)
John W. Linville7c1e1832010-09-24 15:52:49 -04002344 goto out_free_skb;
Johannes Berg554891e2010-09-24 12:38:25 +02002345 rx->flags |= IEEE80211_RX_CMNTR;
John W. Linville7c1e1832010-09-24 15:52:49 -04002346
Michael Wu3d30d942008-01-31 19:48:27 +01002347 if (skb_headroom(skb) < sizeof(*rthdr) &&
2348 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2349 goto out_free_skb;
2350
2351 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2352 memset(rthdr, 0, sizeof(*rthdr));
2353 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2354 rthdr->hdr.it_present =
2355 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
Michael Wu3d30d942008-01-31 19:48:27 +01002356 (1 << IEEE80211_RADIOTAP_CHANNEL));
2357
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002358 if (rate) {
2359 rthdr->rate_or_pad = rate->bitrate / 5;
2360 rthdr->hdr.it_present |=
2361 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2362 }
Michael Wu3d30d942008-01-31 19:48:27 +01002363 rthdr->chan_freq = cpu_to_le16(status->freq);
2364
2365 if (status->band == IEEE80211_BAND_5GHZ)
2366 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2367 IEEE80211_CHAN_5GHZ);
2368 else
2369 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2370 IEEE80211_CHAN_2GHZ);
2371
2372 skb_set_mac_header(skb, 0);
2373 skb->ip_summed = CHECKSUM_UNNECESSARY;
2374 skb->pkt_type = PACKET_OTHERHOST;
2375 skb->protocol = htons(ETH_P_802_2);
2376
2377 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01002378 if (!ieee80211_sdata_running(sdata))
Michael Wu3d30d942008-01-31 19:48:27 +01002379 continue;
2380
Johannes Berg05c914f2008-09-11 00:01:58 +02002381 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Michael Wu3d30d942008-01-31 19:48:27 +01002382 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2383 continue;
2384
2385 if (prev_dev) {
2386 skb2 = skb_clone(skb, GFP_ATOMIC);
2387 if (skb2) {
2388 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04002389 netif_receive_skb(skb2);
Michael Wu3d30d942008-01-31 19:48:27 +01002390 }
2391 }
2392
2393 prev_dev = sdata->dev;
2394 sdata->dev->stats.rx_packets++;
2395 sdata->dev->stats.rx_bytes += skb->len;
2396 }
2397
2398 if (prev_dev) {
2399 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04002400 netif_receive_skb(skb);
Johannes Berg554891e2010-09-24 12:38:25 +02002401 return;
2402 }
Michael Wu3d30d942008-01-31 19:48:27 +01002403
2404 out_free_skb:
2405 dev_kfree_skb(skb);
2406}
2407
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002408static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2409 ieee80211_rx_result res)
2410{
2411 switch (res) {
2412 case RX_DROP_MONITOR:
2413 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2414 if (rx->sta)
2415 rx->sta->rx_dropped++;
2416 /* fall through */
2417 case RX_CONTINUE: {
2418 struct ieee80211_rate *rate = NULL;
2419 struct ieee80211_supported_band *sband;
2420 struct ieee80211_rx_status *status;
2421
2422 status = IEEE80211_SKB_RXCB((rx->skb));
2423
2424 sband = rx->local->hw.wiphy->bands[status->band];
2425 if (!(status->flag & RX_FLAG_HT))
2426 rate = &sband->bitrates[status->rate_idx];
2427
2428 ieee80211_rx_cooked_monitor(rx, rate);
2429 break;
2430 }
2431 case RX_DROP_UNUSABLE:
2432 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2433 if (rx->sta)
2434 rx->sta->rx_dropped++;
2435 dev_kfree_skb(rx->skb);
2436 break;
2437 case RX_QUEUED:
2438 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2439 break;
2440 }
2441}
2442
2443static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2444 struct sk_buff_head *frames)
2445{
2446 ieee80211_rx_result res = RX_DROP_MONITOR;
2447 struct sk_buff *skb;
2448
2449#define CALL_RXH(rxh) \
2450 do { \
2451 res = rxh(rx); \
2452 if (res != RX_CONTINUE) \
2453 goto rxh_next; \
2454 } while (0);
2455
2456 while ((skb = __skb_dequeue(frames))) {
2457 /*
2458 * all the other fields are valid across frames
2459 * that belong to an aMPDU since they are on the
2460 * same TID from the same station
2461 */
2462 rx->skb = skb;
Johannes Berg554891e2010-09-24 12:38:25 +02002463 rx->flags = 0;
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002464
2465 CALL_RXH(ieee80211_rx_h_decrypt)
2466 CALL_RXH(ieee80211_rx_h_check_more_data)
2467 CALL_RXH(ieee80211_rx_h_sta_process)
2468 CALL_RXH(ieee80211_rx_h_defragment)
2469 CALL_RXH(ieee80211_rx_h_ps_poll)
2470 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2471 /* must be after MMIC verify so header is counted in MPDU mic */
2472 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2473 CALL_RXH(ieee80211_rx_h_amsdu)
2474#ifdef CONFIG_MAC80211_MESH
2475 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2476 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2477#endif
2478 CALL_RXH(ieee80211_rx_h_data)
2479
2480 /* special treatment -- needs the queue */
2481 res = ieee80211_rx_h_ctrl(rx, frames);
2482 if (res != RX_CONTINUE)
2483 goto rxh_next;
2484
Johannes Berg2e161f72010-08-12 15:38:38 +02002485 CALL_RXH(ieee80211_rx_h_mgmt_check)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002486 CALL_RXH(ieee80211_rx_h_action)
Johannes Berg2e161f72010-08-12 15:38:38 +02002487 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2488 CALL_RXH(ieee80211_rx_h_action_return)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002489 CALL_RXH(ieee80211_rx_h_mgmt)
2490
2491 rxh_next:
2492 ieee80211_rx_handlers_result(rx, res);
2493
2494#undef CALL_RXH
2495 }
2496}
Johannes Berg571ecf62007-07-27 15:43:22 +02002497
Johannes Berg4406c372010-09-24 11:21:06 +02002498static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
Johannes Berg58905292008-01-31 19:48:25 +01002499{
Johannes Berg2569a822009-11-25 17:46:17 +01002500 struct sk_buff_head reorder_release;
Johannes Berg58905292008-01-31 19:48:25 +01002501 ieee80211_rx_result res = RX_DROP_MONITOR;
2502
Johannes Berg2569a822009-11-25 17:46:17 +01002503 __skb_queue_head_init(&reorder_release);
2504
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002505#define CALL_RXH(rxh) \
2506 do { \
2507 res = rxh(rx); \
2508 if (res != RX_CONTINUE) \
Johannes Berg2569a822009-11-25 17:46:17 +01002509 goto rxh_next; \
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002510 } while (0);
Johannes Berg58905292008-01-31 19:48:25 +01002511
Johannes Berg49461622008-06-30 15:10:45 +02002512 CALL_RXH(ieee80211_rx_h_passive_scan)
2513 CALL_RXH(ieee80211_rx_h_check)
Johannes Berg2569a822009-11-25 17:46:17 +01002514
2515 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2516
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002517 ieee80211_rx_handlers(rx, &reorder_release);
2518 return;
Johannes Berg49461622008-06-30 15:10:45 +02002519
Johannes Berg2569a822009-11-25 17:46:17 +01002520 rxh_next:
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002521 ieee80211_rx_handlers_result(rx, res);
2522
2523#undef CALL_RXH
Johannes Berg58905292008-01-31 19:48:25 +01002524}
2525
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002526/*
2527 * This function makes calls into the RX path. Therefore the
2528 * caller must hold the sta_info->lock and everything has to
2529 * be under rcu_read_lock protection as well.
2530 */
2531void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2532{
2533 struct sk_buff_head frames;
Johannes Berg554891e2010-09-24 12:38:25 +02002534 struct ieee80211_rx_data rx = {
2535 .sta = sta,
2536 .sdata = sta->sdata,
2537 .local = sta->local,
2538 .queue = tid,
2539 };
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02002540 struct tid_ampdu_rx *tid_agg_rx;
2541
2542 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2543 if (!tid_agg_rx)
2544 return;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002545
2546 __skb_queue_head_init(&frames);
2547
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02002548 spin_lock(&tid_agg_rx->reorder_lock);
2549 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx, &frames);
2550 spin_unlock(&tid_agg_rx->reorder_lock);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02002551
2552 ieee80211_rx_handlers(&rx, &frames);
2553}
2554
Johannes Berg571ecf62007-07-27 15:43:22 +02002555/* main receive path */
2556
Johannes Berg20b01f82010-09-24 11:21:05 +02002557static int prepare_for_handlers(struct ieee80211_rx_data *rx,
Johannes Berg23a24de2007-07-27 15:43:22 +02002558 struct ieee80211_hdr *hdr)
2559{
Johannes Berg20b01f82010-09-24 11:21:05 +02002560 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002561 struct sk_buff *skb = rx->skb;
2562 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2563 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02002564 int multicast = is_multicast_ether_addr(hdr->addr1);
2565
Johannes Berg51fb61e2007-12-19 01:31:27 +01002566 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02002567 case NL80211_IFTYPE_STATION:
Johannes Berg9bc383d2009-11-19 11:55:19 +01002568 if (!bssid && !sdata->u.mgd.use_4addr)
Johannes Berg23a24de2007-07-27 15:43:22 +02002569 return 0;
Johannes Berg77fdaa12009-07-07 03:45:17 +02002570 if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002571 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002572 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002573 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02002574 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002575 }
2576 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002577 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02002578 if (!bssid)
2579 return 0;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002580 if (ieee80211_is_beacon(hdr->frame_control)) {
Bruno Randolf9d9bf772008-02-18 11:21:36 +09002581 return 1;
Vladimir Koutny87291c02008-06-13 16:50:44 +02002582 }
Johannes Berg46900292009-02-15 12:44:28 +01002583 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
Johannes Berg554891e2010-09-24 12:38:25 +02002584 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002585 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02002586 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002587 } else if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002588 compare_ether_addr(sdata->vif.addr,
Johannes Berg23a24de2007-07-27 15:43:22 +02002589 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002590 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002591 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02002592 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002593 } else if (!rx->sta) {
2594 int rate_idx;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002595 if (status->flag & RX_FLAG_HT)
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002596 rate_idx = 0; /* TODO: HT rates */
2597 else
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002598 rate_idx = status->rate_idx;
Johannes Berg34e89502010-02-03 13:59:58 +01002599 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2600 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002601 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002602 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002603 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg6032f932008-02-23 15:17:07 +01002604 if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002605 compare_ether_addr(sdata->vif.addr,
Johannes Berg6032f932008-02-23 15:17:07 +01002606 hdr->addr1) != 0) {
2607 if (!(sdata->dev->flags & IFF_PROMISC))
2608 return 0;
2609
Johannes Berg554891e2010-09-24 12:38:25 +02002610 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg6032f932008-02-23 15:17:07 +01002611 }
2612 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002613 case NL80211_IFTYPE_AP_VLAN:
2614 case NL80211_IFTYPE_AP:
Johannes Berg23a24de2007-07-27 15:43:22 +02002615 if (!bssid) {
Johannes Berg47846c92009-11-25 17:46:19 +01002616 if (compare_ether_addr(sdata->vif.addr,
Johannes Berg23a24de2007-07-27 15:43:22 +02002617 hdr->addr1))
2618 return 0;
2619 } else if (!ieee80211_bssid_match(bssid,
Johannes Berg47846c92009-11-25 17:46:19 +01002620 sdata->vif.addr)) {
Johannes Berg554891e2010-09-24 12:38:25 +02002621 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002622 return 0;
Johannes Berg554891e2010-09-24 12:38:25 +02002623 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002624 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002625 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002626 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07002627 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02002628 return 0;
2629 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2630 return 0;
2631 break;
Johannes Berg2ca27bc2010-09-16 14:58:23 +02002632 default:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02002633 /* should never get here */
2634 WARN_ON(1);
2635 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02002636 }
2637
2638 return 1;
2639}
2640
Johannes Berg571ecf62007-07-27 15:43:22 +02002641/*
Johannes Berg4406c372010-09-24 11:21:06 +02002642 * This function returns whether or not the SKB
2643 * was destined for RX processing or not, which,
2644 * if consume is true, is equivalent to whether
2645 * or not the skb was consumed.
2646 */
2647static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2648 struct sk_buff *skb, bool consume)
2649{
2650 struct ieee80211_local *local = rx->local;
2651 struct ieee80211_sub_if_data *sdata = rx->sdata;
2652 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2653 struct ieee80211_hdr *hdr = (void *)skb->data;
2654 int prepares;
2655
2656 rx->skb = skb;
Johannes Berg554891e2010-09-24 12:38:25 +02002657 status->rx_flags |= IEEE80211_RX_RA_MATCH;
Johannes Berg4406c372010-09-24 11:21:06 +02002658 prepares = prepare_for_handlers(rx, hdr);
2659
2660 if (!prepares)
2661 return false;
2662
2663 if (status->flag & RX_FLAG_MMIC_ERROR) {
Johannes Berg554891e2010-09-24 12:38:25 +02002664 if (status->rx_flags & IEEE80211_RX_RA_MATCH)
Johannes Berg4406c372010-09-24 11:21:06 +02002665 ieee80211_rx_michael_mic_report(hdr, rx);
2666 return false;
2667 }
2668
2669 if (!consume) {
2670 skb = skb_copy(skb, GFP_ATOMIC);
2671 if (!skb) {
2672 if (net_ratelimit())
2673 wiphy_debug(local->hw.wiphy,
2674 "failed to copy multicast frame for %s\n",
2675 sdata->name);
2676 return true;
2677 }
2678
2679 rx->skb = skb;
2680 }
2681
2682 ieee80211_invoke_rx_handlers(rx);
2683 return true;
2684}
2685
2686/*
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002687 * This is the actual Rx frames handler. as it blongs to Rx path it must
2688 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02002689 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002690static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
Christian Lamparter071d9ac2010-08-05 01:36:36 +02002691 struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02002692{
Johannes Berg554891e2010-09-24 12:38:25 +02002693 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002694 struct ieee80211_local *local = hw_to_local(hw);
2695 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002696 struct ieee80211_hdr *hdr;
Zhu Yie3cf8b32010-03-29 17:35:07 +08002697 __le16 fc;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002698 struct ieee80211_rx_data rx;
Johannes Berg4406c372010-09-24 11:21:06 +02002699 struct ieee80211_sub_if_data *prev;
Ben Greear56af3262010-09-23 10:22:24 -07002700 struct sta_info *sta, *tmp, *prev_sta;
Zhu Yie3cf8b32010-03-29 17:35:07 +08002701 int err = 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02002702
Zhu Yie3cf8b32010-03-29 17:35:07 +08002703 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02002704 memset(&rx, 0, sizeof(rx));
2705 rx.skb = skb;
2706 rx.local = local;
Johannes Berg72abd812007-09-17 01:29:22 -04002707
Zhu Yie3cf8b32010-03-29 17:35:07 +08002708 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
Johannes Berg571ecf62007-07-27 15:43:22 +02002709 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02002710
Helmut Schaa142b9f52009-07-23 13:18:01 +02002711 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2712 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
Johannes Berg554891e2010-09-24 12:38:25 +02002713 status->rx_flags |= IEEE80211_RX_IN_SCAN;
Johannes Berg571ecf62007-07-27 15:43:22 +02002714
Zhu Yie3cf8b32010-03-29 17:35:07 +08002715 if (ieee80211_is_mgmt(fc))
2716 err = skb_linearize(skb);
2717 else
2718 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2719
2720 if (err) {
2721 dev_kfree_skb(skb);
2722 return;
2723 }
2724
2725 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg38f37142008-01-29 17:07:43 +01002726 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01002727 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01002728
Zhu Yie3cf8b32010-03-29 17:35:07 +08002729 if (ieee80211_is_data(fc)) {
Ben Greear56af3262010-09-23 10:22:24 -07002730 prev_sta = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02002731
Johannes Bergabe60632009-11-25 17:46:18 +01002732 for_each_sta_info(local, hdr->addr2, sta, tmp) {
Ben Greear56af3262010-09-23 10:22:24 -07002733 if (!prev_sta) {
2734 prev_sta = sta;
2735 continue;
2736 }
2737
2738 rx.sta = prev_sta;
2739 rx.sdata = prev_sta->sdata;
Johannes Berg4406c372010-09-24 11:21:06 +02002740 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Johannes Berg571ecf62007-07-27 15:43:22 +02002741
Ben Greear56af3262010-09-23 10:22:24 -07002742 prev_sta = sta;
Johannes Berg4406c372010-09-24 11:21:06 +02002743 }
Ben Greear56af3262010-09-23 10:22:24 -07002744
2745 if (prev_sta) {
2746 rx.sta = prev_sta;
2747 rx.sdata = prev_sta->sdata;
2748
Johannes Berg4406c372010-09-24 11:21:06 +02002749 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
Ben Greear56af3262010-09-23 10:22:24 -07002750 return;
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05302751 goto out;
Ben Greear56af3262010-09-23 10:22:24 -07002752 }
Johannes Berg4406c372010-09-24 11:21:06 +02002753 }
2754
Johannes Berg4b0dd982010-09-24 11:21:07 +02002755 prev = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02002756
Johannes Berg4b0dd982010-09-24 11:21:07 +02002757 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2758 if (!ieee80211_sdata_running(sdata))
2759 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01002760
Johannes Berg4b0dd982010-09-24 11:21:07 +02002761 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2762 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2763 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01002764
Johannes Berg4b0dd982010-09-24 11:21:07 +02002765 /*
2766 * frame is destined for this interface, but if it's
2767 * not also for the previous one we handle that after
2768 * the loop to avoid copying the SKB once too much
2769 */
Johannes Bergb2e77712007-09-26 15:19:39 +02002770
Johannes Berg4b0dd982010-09-24 11:21:07 +02002771 if (!prev) {
Johannes Berg340e11f2007-07-27 15:43:22 +02002772 prev = sdata;
Johannes Berg4b0dd982010-09-24 11:21:07 +02002773 continue;
Johannes Berg8e6f0032007-07-27 15:43:22 +02002774 }
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002775
Johannes Berg4b0dd982010-09-24 11:21:07 +02002776 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2777 rx.sdata = prev;
2778 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002779
Johannes Berg4b0dd982010-09-24 11:21:07 +02002780 prev = sdata;
2781 }
Johannes Berg4406c372010-09-24 11:21:06 +02002782
Johannes Berg4b0dd982010-09-24 11:21:07 +02002783 if (prev) {
2784 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2785 rx.sdata = prev;
2786
2787 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2788 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002789 }
Johannes Berg4406c372010-09-24 11:21:06 +02002790
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05302791 out:
Johannes Berg4406c372010-09-24 11:21:06 +02002792 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002793}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002794
2795/*
2796 * This is the receive path handler. It is called by a low level driver when an
2797 * 802.11 MPDU is received from the hardware.
2798 */
John W. Linville103bf9f2009-08-20 16:34:15 -04002799void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002800{
2801 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01002802 struct ieee80211_rate *rate = NULL;
2803 struct ieee80211_supported_band *sband;
Johannes Bergf1d58c22009-06-17 13:13:00 +02002804 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg8318d782008-01-24 19:38:38 +01002805
Johannes Bergd20ef632009-10-11 15:10:40 +02002806 WARN_ON_ONCE(softirq_count() == 0);
2807
Johannes Berg77a980d2009-08-24 11:46:30 +02002808 if (WARN_ON(status->band < 0 ||
2809 status->band >= IEEE80211_NUM_BANDS))
2810 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01002811
2812 sband = local->hw.wiphy->bands[status->band];
Johannes Berg77a980d2009-08-24 11:46:30 +02002813 if (WARN_ON(!sband))
2814 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01002815
Johannes Berg89c3a8a2009-07-28 18:10:17 +02002816 /*
2817 * If we're suspending, it is possible although not too likely
2818 * that we'd be receiving frames after having already partially
2819 * quiesced the stack. We can't process such frames then since
2820 * that might, for example, cause stations to be added or other
2821 * driver callbacks be invoked.
2822 */
Johannes Berg77a980d2009-08-24 11:46:30 +02002823 if (unlikely(local->quiescing || local->suspended))
2824 goto drop;
Johannes Berg89c3a8a2009-07-28 18:10:17 +02002825
Johannes Bergea77f122009-08-21 14:44:45 +02002826 /*
2827 * The same happens when we're not even started,
2828 * but that's worth a warning.
2829 */
Johannes Berg77a980d2009-08-24 11:46:30 +02002830 if (WARN_ON(!local->started))
2831 goto drop;
Johannes Bergea77f122009-08-21 14:44:45 +02002832
Johannes Bergfc885182010-07-30 13:23:12 +02002833 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05002834 /*
Johannes Bergfc885182010-07-30 13:23:12 +02002835 * Validate the rate, unless a PLCP error means that
2836 * we probably can't have a valid rate here anyway.
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05002837 */
Johannes Bergfc885182010-07-30 13:23:12 +02002838
2839 if (status->flag & RX_FLAG_HT) {
2840 /*
2841 * rate_idx is MCS index, which can be [0-76]
2842 * as documented on:
2843 *
2844 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2845 *
2846 * Anything else would be some sort of driver or
2847 * hardware error. The driver should catch hardware
2848 * errors.
2849 */
2850 if (WARN((status->rate_idx < 0 ||
2851 status->rate_idx > 76),
2852 "Rate marked as an HT rate but passed "
2853 "status->rate_idx is not "
2854 "an MCS index [0-76]: %d (0x%02x)\n",
2855 status->rate_idx,
2856 status->rate_idx))
2857 goto drop;
2858 } else {
2859 if (WARN_ON(status->rate_idx < 0 ||
2860 status->rate_idx >= sband->n_bitrates))
2861 goto drop;
2862 rate = &sband->bitrates[status->rate_idx];
2863 }
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002864 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002865
Johannes Berg554891e2010-09-24 12:38:25 +02002866 status->rx_flags = 0;
2867
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002868 /*
2869 * key references and virtual interfaces are protected using RCU
2870 * and this requires that we are in a read-side RCU section during
2871 * receive processing
2872 */
2873 rcu_read_lock();
2874
2875 /*
2876 * Frames with failed FCS/PLCP checksum are not returned,
2877 * all other frames are returned without radiotap header
2878 * if it was previously present.
2879 * Also, frames with less than 16 bytes are dropped.
2880 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002881 skb = ieee80211_rx_monitor(local, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002882 if (!skb) {
2883 rcu_read_unlock();
2884 return;
2885 }
2886
Christian Lamparter071d9ac2010-08-05 01:36:36 +02002887 __ieee80211_rx_handle_packet(hw, skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002888
2889 rcu_read_unlock();
Johannes Berg77a980d2009-08-24 11:46:30 +02002890
2891 return;
2892 drop:
2893 kfree_skb(skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002894}
John W. Linville103bf9f2009-08-20 16:34:15 -04002895EXPORT_SYMBOL(ieee80211_rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02002896
2897/* This is a version of the rx handler that can be called from hard irq
2898 * context. Post the skb on the queue and schedule the tasklet */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002899void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02002900{
2901 struct ieee80211_local *local = hw_to_local(hw);
2902
2903 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2904
Johannes Berg571ecf62007-07-27 15:43:22 +02002905 skb->pkt_type = IEEE80211_RX_MSG;
2906 skb_queue_tail(&local->skb_queue, skb);
2907 tasklet_schedule(&local->tasklet);
2908}
2909EXPORT_SYMBOL(ieee80211_rx_irqsafe);