blob: ee01daccacbb72ac84f933f4cdbac2afcb4137de [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;
296 netif_rx(skb2);
297 }
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;
307 netif_rx(skb);
308 } 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 Berg6e0d1142007-07-27 15:43:22 +0200318 int tid;
319
320 /* does the frame have a qos control field? */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700321 if (ieee80211_is_data_qos(hdr->frame_control)) {
322 u8 *qc = ieee80211_get_qos_ctl(hdr);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200323 /* frame has qos control */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700324 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
325 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
Johannes Berg5cf121c2008-02-25 16:27:43 +0100326 rx->flags |= IEEE80211_RX_AMSDU;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +0200327 else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100328 rx->flags &= ~IEEE80211_RX_AMSDU;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200329 } else {
Johannes Berg1411f9b2008-07-10 10:11:02 +0200330 /*
331 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
332 *
333 * Sequence numbers for management frames, QoS data
334 * frames with a broadcast/multicast address in the
335 * Address 1 field, and all non-QoS data frames sent
336 * by QoS STAs are assigned using an additional single
337 * modulo-4096 counter, [...]
338 *
339 * We also use that counter for non-QoS STAs.
340 */
341 tid = NUM_RX_DATA_QUEUES - 1;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200342 }
Johannes Berg52865df2007-07-27 15:43:22 +0200343
Johannes Berg5cf121c2008-02-25 16:27:43 +0100344 rx->queue = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200345 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
346 * For now, set skb->priority to 0 for other cases. */
347 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100348}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200349
Johannes Bergd1c3a372009-01-07 00:26:10 +0100350/**
351 * DOC: Packet alignment
352 *
353 * Drivers always need to pass packets that are aligned to two-byte boundaries
354 * to the stack.
355 *
356 * Additionally, should, if possible, align the payload data in a way that
357 * guarantees that the contained IP header is aligned to a four-byte
358 * boundary. In the case of regular frames, this simply means aligning the
359 * payload to a four-byte boundary (because either the IP header is directly
360 * contained, or IV/RFC1042 headers that have a length divisible by four are
Kalle Valo59d9cb02009-12-17 13:54:57 +0100361 * in front of it). If the payload data is not properly aligned and the
362 * architecture doesn't support efficient unaligned operations, mac80211
363 * will align the data.
Johannes Bergd1c3a372009-01-07 00:26:10 +0100364 *
365 * With A-MSDU frames, however, the payload data address must yield two modulo
366 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
367 * push the IP header further back to a multiple of four again. Thankfully, the
368 * specs were sane enough this time around to require padding each A-MSDU
369 * subframe to a length that is a multiple of four.
370 *
371 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
372 * the payload is not supported, the driver is required to move the 802.11
373 * header to be directly in front of the payload in that case.
374 */
375static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
Johannes Berg38f37142008-01-29 17:07:43 +0100376{
Kalle Valo59d9cb02009-12-17 13:54:57 +0100377#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
378 WARN_ONCE((unsigned long)rx->skb->data & 1,
379 "unaligned packet at 0x%p\n", rx->skb->data);
Johannes Bergd1c3a372009-01-07 00:26:10 +0100380#endif
Johannes Berg6e0d1142007-07-27 15:43:22 +0200381}
382
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +0200383
Johannes Berg571ecf62007-07-27 15:43:22 +0200384/* rx handlers */
385
Johannes Berg49461622008-06-30 15:10:45 +0200386static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100387ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200388{
389 struct ieee80211_local *local = rx->local;
390 struct sk_buff *skb = rx->skb;
391
Helmut Schaafbe9c422009-07-23 12:14:04 +0200392 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning)))
Johannes Bergf1d58c22009-06-17 13:13:00 +0200393 return ieee80211_scan_rx(rx->sdata, skb);
Zhu Yiece8edd2007-11-22 10:53:21 +0800394
Helmut Schaa142b9f52009-07-23 13:18:01 +0200395 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) &&
396 (rx->flags & IEEE80211_RX_IN_SCAN))) {
Zhu Yiece8edd2007-11-22 10:53:21 +0800397 /* drop all the other packets during a software scan anyway */
Johannes Bergf1d58c22009-06-17 13:13:00 +0200398 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
Zhu Yiece8edd2007-11-22 10:53:21 +0800399 dev_kfree_skb(skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100400 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200401 }
402
Johannes Berg5cf121c2008-02-25 16:27:43 +0100403 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200404 /* scanning finished during invoking of handlers */
405 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100406 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200407 }
408
Johannes Berg9ae54c82008-01-31 19:48:20 +0100409 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200410}
411
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200412
413static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
414{
415 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
416
417 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
418 return 0;
419
420 return ieee80211_is_robust_mgmt_frame(hdr);
421}
422
423
424static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
425{
426 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
427
428 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
429 return 0;
430
431 return ieee80211_is_robust_mgmt_frame(hdr);
432}
433
434
435/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
436static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
437{
438 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
439 struct ieee80211_mmie *mmie;
440
441 if (skb->len < 24 + sizeof(*mmie) ||
442 !is_multicast_ether_addr(hdr->da))
443 return -1;
444
445 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
446 return -1; /* not a robust management frame */
447
448 mmie = (struct ieee80211_mmie *)
449 (skb->data + skb->len - sizeof(*mmie));
450 if (mmie->element_id != WLAN_EID_MMIE ||
451 mmie->length != sizeof(*mmie) - 2)
452 return -1;
453
454 return le16_to_cpu(mmie->key_id);
455}
456
457
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100458static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100459ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100460{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700461 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
462 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg47846c92009-11-25 17:46:19 +0100463 char *dev_addr = rx->sdata->vif.addr;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100464
Harvey Harrisona7767f92008-07-02 16:30:51 -0700465 if (ieee80211_is_data(hdr->frame_control)) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700466 if (is_multicast_ether_addr(hdr->addr1)) {
467 if (ieee80211_has_tods(hdr->frame_control) ||
468 !ieee80211_has_fromds(hdr->frame_control))
469 return RX_DROP_MONITOR;
470 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
471 return RX_DROP_MONITOR;
472 } else {
473 if (!ieee80211_has_a4(hdr->frame_control))
474 return RX_DROP_MONITOR;
475 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
476 return RX_DROP_MONITOR;
477 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100478 }
479
480 /* If there is not an established peer link and this is not a peer link
481 * establisment frame, beacon or probe, drop the frame.
482 */
483
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800484 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100485 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100486
Harvey Harrisona7767f92008-07-02 16:30:51 -0700487 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100488 return RX_DROP_MONITOR;
489
Harvey Harrisona7767f92008-07-02 16:30:51 -0700490 if (ieee80211_is_action(hdr->frame_control)) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100491 mgmt = (struct ieee80211_mgmt *)hdr;
Javier Cardona97ad9132010-03-29 11:00:21 -0700492 if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100493 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100494 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100495 }
496
Harvey Harrisona7767f92008-07-02 16:30:51 -0700497 if (ieee80211_is_probe_req(hdr->frame_control) ||
498 ieee80211_is_probe_resp(hdr->frame_control) ||
499 ieee80211_is_beacon(hdr->frame_control))
500 return RX_CONTINUE;
501
502 return RX_DROP_MONITOR;
503
504 }
505
506#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
507
508 if (ieee80211_is_data(hdr->frame_control) &&
509 is_multicast_ether_addr(hdr->addr1) &&
Javier Cardona3c5772a2009-08-10 12:15:48 -0700510 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100511 return RX_DROP_MONITOR;
Johannes Berg902acc72008-02-23 15:17:19 +0100512#undef msh_h_get
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100513
Johannes Berg902acc72008-02-23 15:17:19 +0100514 return RX_CONTINUE;
515}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100516
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100517#define SEQ_MODULO 0x1000
518#define SEQ_MASK 0xfff
519
520static inline int seq_less(u16 sq1, u16 sq2)
521{
522 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
523}
524
525static inline u16 seq_inc(u16 sq)
526{
527 return (sq + 1) & SEQ_MASK;
528}
529
530static inline u16 seq_sub(u16 sq1, u16 sq2)
531{
532 return (sq1 - sq2) & SEQ_MASK;
533}
534
535
536static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
537 struct tid_ampdu_rx *tid_agg_rx,
Johannes Berg2569a822009-11-25 17:46:17 +0100538 int index,
539 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100540{
541 struct ieee80211_supported_band *sband;
542 struct ieee80211_rate *rate = NULL;
543 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
544 struct ieee80211_rx_status *status;
545
546 if (!skb)
547 goto no_frame;
548
549 status = IEEE80211_SKB_RXCB(skb);
550
551 /* release the reordered frames to stack */
552 sband = hw->wiphy->bands[status->band];
553 if (!(status->flag & RX_FLAG_HT))
554 rate = &sband->bitrates[status->rate_idx];
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100555 tid_agg_rx->stored_mpdu_num--;
556 tid_agg_rx->reorder_buf[index] = NULL;
Johannes Bergd29cecd2009-12-04 14:25:43 -0800557 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100558
559no_frame:
560 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
561}
562
563static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
564 struct tid_ampdu_rx *tid_agg_rx,
Johannes Berg2569a822009-11-25 17:46:17 +0100565 u16 head_seq_num,
566 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100567{
568 int index;
569
570 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
571 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
572 tid_agg_rx->buf_size;
Johannes Berg2569a822009-11-25 17:46:17 +0100573 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100574 }
575}
576
577/*
578 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
579 * the skb was added to the buffer longer than this time ago, the earlier
580 * frames that have not yet been received are assumed to be lost and the skb
581 * can be released for processing. This may also release other skb's from the
582 * reorder buffer if there are no additional gaps between the frames.
583 */
584#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
585
586/*
587 * As this function belongs to the RX path it must be under
588 * rcu_read_lock protection. It returns false if the frame
589 * can be processed immediately, true if it was consumed.
590 */
591static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
592 struct tid_ampdu_rx *tid_agg_rx,
Johannes Berg2569a822009-11-25 17:46:17 +0100593 struct sk_buff *skb,
594 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100595{
596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
597 u16 sc = le16_to_cpu(hdr->seq_ctrl);
598 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
599 u16 head_seq_num, buf_size;
600 int index;
601
602 buf_size = tid_agg_rx->buf_size;
603 head_seq_num = tid_agg_rx->head_seq_num;
604
605 /* frame with out of date sequence number */
606 if (seq_less(mpdu_seq_num, head_seq_num)) {
607 dev_kfree_skb(skb);
608 return true;
609 }
610
611 /*
612 * If frame the sequence number exceeds our buffering window
613 * size release some previous frames to make room for this one.
614 */
615 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
616 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
617 /* release stored frames up to new head to stack */
Johannes Berg2569a822009-11-25 17:46:17 +0100618 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
619 frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100620 }
621
622 /* Now the new frame is always in the range of the reordering buffer */
623
624 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
625
626 /* check if we already stored this frame */
627 if (tid_agg_rx->reorder_buf[index]) {
628 dev_kfree_skb(skb);
629 return true;
630 }
631
632 /*
633 * If the current MPDU is in the right order and nothing else
634 * is stored we can process it directly, no need to buffer it.
635 */
636 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
637 tid_agg_rx->stored_mpdu_num == 0) {
638 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
639 return false;
640 }
641
642 /* put the frame in the reordering buffer */
643 tid_agg_rx->reorder_buf[index] = skb;
644 tid_agg_rx->reorder_time[index] = jiffies;
645 tid_agg_rx->stored_mpdu_num++;
646 /* release the buffer until next missing frame */
647 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
648 tid_agg_rx->buf_size;
649 if (!tid_agg_rx->reorder_buf[index] &&
650 tid_agg_rx->stored_mpdu_num > 1) {
651 /*
652 * No buffers ready to be released, but check whether any
653 * frames in the reorder buffer have timed out.
654 */
655 int j;
656 int skipped = 1;
657 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
658 j = (j + 1) % tid_agg_rx->buf_size) {
659 if (!tid_agg_rx->reorder_buf[j]) {
660 skipped++;
661 continue;
662 }
663 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
664 HT_RX_REORDER_BUF_TIMEOUT))
665 break;
666
667#ifdef CONFIG_MAC80211_HT_DEBUG
668 if (net_ratelimit())
669 printk(KERN_DEBUG "%s: release an RX reorder "
670 "frame due to timeout on earlier "
671 "frames\n",
672 wiphy_name(hw->wiphy));
673#endif
Johannes Berg2569a822009-11-25 17:46:17 +0100674 ieee80211_release_reorder_frame(hw, tid_agg_rx,
675 j, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100676
677 /*
678 * Increment the head seq# also for the skipped slots.
679 */
680 tid_agg_rx->head_seq_num =
681 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
682 skipped = 0;
683 }
684 } else while (tid_agg_rx->reorder_buf[index]) {
Johannes Berg2569a822009-11-25 17:46:17 +0100685 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100686 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
687 tid_agg_rx->buf_size;
688 }
689
690 return true;
691}
692
693/*
694 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
695 * true if the MPDU was buffered, false if it should be processed.
696 */
Johannes Berg2569a822009-11-25 17:46:17 +0100697static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
698 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100699{
Johannes Berg2569a822009-11-25 17:46:17 +0100700 struct sk_buff *skb = rx->skb;
701 struct ieee80211_local *local = rx->local;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100702 struct ieee80211_hw *hw = &local->hw;
703 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Johannes Berg2569a822009-11-25 17:46:17 +0100704 struct sta_info *sta = rx->sta;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100705 struct tid_ampdu_rx *tid_agg_rx;
706 u16 sc;
707 int tid;
708
709 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg2569a822009-11-25 17:46:17 +0100710 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100711
712 /*
713 * filter the QoS data rx stream according to
714 * STA/TID and check if this STA/TID is on aggregation
715 */
716
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100717 if (!sta)
Johannes Berg2569a822009-11-25 17:46:17 +0100718 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100719
720 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
721
Johannes Berga87f7362010-06-10 10:21:38 +0200722 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
723 if (!tid_agg_rx)
724 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100725
726 /* qos null data frames are excluded */
727 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Johannes Berga87f7362010-06-10 10:21:38 +0200728 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100729
730 /* new, potentially un-ordered, ampdu frame - process it */
731
732 /* reset session timer */
733 if (tid_agg_rx->timeout)
734 mod_timer(&tid_agg_rx->session_timer,
735 TU_TO_EXP_TIME(tid_agg_rx->timeout));
736
737 /* if this mpdu is fragmented - terminate rx aggregation session */
738 sc = le16_to_cpu(hdr->seq_ctrl);
739 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Bergc1475ca2010-06-10 10:21:37 +0200740 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg344eec62010-06-10 10:21:36 +0200741 skb_queue_tail(&rx->sdata->skb_queue, skb);
742 ieee80211_queue_work(&local->hw, &rx->sdata->work);
Johannes Berg2569a822009-11-25 17:46:17 +0100743 return;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100744 }
745
Johannes Berga87f7362010-06-10 10:21:38 +0200746 /*
747 * No locking needed -- we will only ever process one
748 * RX packet at a time, and thus own tid_agg_rx. All
749 * other code manipulating it needs to (and does) make
750 * sure that we cannot get to it any more before doing
751 * anything with it.
752 */
753 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
Johannes Berg2569a822009-11-25 17:46:17 +0100754 return;
755
756 dont_reorder:
757 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100758}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100759
Johannes Berg49461622008-06-30 15:10:45 +0200760static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100761ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200762{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700763 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +0200764
765 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
766 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700767 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100768 rx->sta->last_seq_ctrl[rx->queue] ==
Johannes Berg571ecf62007-07-27 15:43:22 +0200769 hdr->seq_ctrl)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +0100770 if (rx->flags & IEEE80211_RX_RA_MATCH) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200771 rx->local->dot11FrameDuplicateCount++;
772 rx->sta->num_duplicates++;
773 }
Johannes Berge4c26ad2008-01-31 19:48:21 +0100774 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200775 } else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100776 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +0200777 }
778
Johannes Berg571ecf62007-07-27 15:43:22 +0200779 if (unlikely(rx->skb->len < 16)) {
780 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100781 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200782 }
783
Johannes Berg571ecf62007-07-27 15:43:22 +0200784 /* Drop disallowed frame classes based on STA auth/assoc state;
785 * IEEE 802.11, Chap 5.5.
786 *
Johannes Bergccd7b362008-09-11 00:01:56 +0200787 * mac80211 filters only based on association state, i.e. it drops
788 * Class 3 frames from not associated stations. hostapd sends
Johannes Berg571ecf62007-07-27 15:43:22 +0200789 * deauth/disassoc frames when needed. In addition, hostapd is
790 * responsible for filtering on both auth and assoc states.
791 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100792
Johannes Berg902acc72008-02-23 15:17:19 +0100793 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100794 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100795
Harvey Harrisona7767f92008-07-02 16:30:51 -0700796 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
797 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200798 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Johannes Berg07346f812008-05-03 01:02:02 +0200799 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700800 if ((!ieee80211_has_fromds(hdr->frame_control) &&
801 !ieee80211_has_tods(hdr->frame_control) &&
802 ieee80211_is_data(hdr->frame_control)) ||
803 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200804 /* Drop IBSS frames and frames for other hosts
805 * silently. */
Johannes Berge4c26ad2008-01-31 19:48:21 +0100806 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200807 }
808
Johannes Berge4c26ad2008-01-31 19:48:21 +0100809 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200810 }
811
Johannes Berg9ae54c82008-01-31 19:48:20 +0100812 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +0200813}
814
815
Johannes Berg49461622008-06-30 15:10:45 +0200816static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100817ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
Johannes Berg570bd532007-07-27 15:43:22 +0200818{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100819 struct sk_buff *skb = rx->skb;
820 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
821 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg3017b802007-08-28 17:01:53 -0400822 int keyidx;
823 int hdrlen;
Johannes Berge4c26ad2008-01-31 19:48:21 +0100824 ieee80211_rx_result result = RX_DROP_UNUSABLE;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400825 struct ieee80211_key *stakey = NULL;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200826 int mmie_keyidx = -1;
Johannes Berg761ab472010-05-28 14:24:19 +0200827 __le16 fc;
Johannes Berg570bd532007-07-27 15:43:22 +0200828
Johannes Berg3017b802007-08-28 17:01:53 -0400829 /*
830 * Key selection 101
831 *
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200832 * There are four types of keys:
Johannes Berg3017b802007-08-28 17:01:53 -0400833 * - GTK (group keys)
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200834 * - IGTK (group keys for management frames)
Johannes Berg3017b802007-08-28 17:01:53 -0400835 * - PTK (pairwise keys)
836 * - STK (station-to-station pairwise keys)
837 *
838 * When selecting a key, we have to distinguish between multicast
839 * (including broadcast) and unicast frames, the latter can only
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200840 * use PTKs and STKs while the former always use GTKs and IGTKs.
841 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
842 * unicast frames can also use key indices like GTKs. Hence, if we
843 * don't have a PTK/STK we check the key index for a WEP key.
Johannes Berg3017b802007-08-28 17:01:53 -0400844 *
Johannes Berg8dc06a12007-08-28 17:01:55 -0400845 * Note that in a regular BSS, multicast frames are sent by the
846 * AP only, associated stations unicast the frame to the AP first
847 * which then multicasts it on their behalf.
848 *
Johannes Berg3017b802007-08-28 17:01:53 -0400849 * There is also a slight problem in IBSS mode: GTKs are negotiated
850 * with each station, that is something we don't currently handle.
Johannes Berg8dc06a12007-08-28 17:01:55 -0400851 * The spec seems to expect that one negotiates the same key with
852 * every station but there's no such requirement; VLANs could be
853 * possible.
Johannes Berg3017b802007-08-28 17:01:53 -0400854 */
Johannes Berg571ecf62007-07-27 15:43:22 +0200855
Johannes Berg3017b802007-08-28 17:01:53 -0400856 /*
Johannes Berg1990af82007-09-26 17:53:15 +0200857 * No point in finding a key and decrypting if the frame is neither
Johannes Berg3017b802007-08-28 17:01:53 -0400858 * addressed to us nor a multicast frame.
859 */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100860 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100861 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -0400862
Johannes Berg2569a822009-11-25 17:46:17 +0100863 /* start without a key */
864 rx->key = NULL;
865
Johannes Bergd4e46a32007-09-14 11:10:24 -0400866 if (rx->sta)
867 stakey = rcu_dereference(rx->sta->key);
868
Johannes Berg761ab472010-05-28 14:24:19 +0200869 fc = hdr->frame_control;
870
871 if (!ieee80211_has_protected(fc))
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300872 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
873
Johannes Bergd4e46a32007-09-14 11:10:24 -0400874 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
875 rx->key = stakey;
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300876 /* Skip decryption if the frame is not protected. */
Johannes Berg761ab472010-05-28 14:24:19 +0200877 if (!ieee80211_has_protected(fc))
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300878 return RX_CONTINUE;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200879 } else if (mmie_keyidx >= 0) {
880 /* Broadcast/multicast robust management frame / BIP */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100881 if ((status->flag & RX_FLAG_DECRYPTED) &&
882 (status->flag & RX_FLAG_IV_STRIPPED))
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200883 return RX_CONTINUE;
884
885 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
886 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
887 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
888 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
Johannes Berg761ab472010-05-28 14:24:19 +0200889 } else if (!ieee80211_has_protected(fc)) {
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300890 /*
891 * The frame was not protected, so skip decryption. However, we
892 * need to set rx->key if there is a key that could have been
893 * used so that the frame may be dropped if encryption would
894 * have been expected.
895 */
896 struct ieee80211_key *key = NULL;
Johannes Berg761ab472010-05-28 14:24:19 +0200897 if (ieee80211_is_mgmt(fc) &&
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300898 is_multicast_ether_addr(hdr->addr1) &&
899 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
900 rx->key = key;
901 else if ((key = rcu_dereference(rx->sdata->default_key)))
902 rx->key = key;
903 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200904 } else {
Zhu Yi39184b12010-04-08 15:35:10 +0800905 u8 keyid;
Johannes Berg3017b802007-08-28 17:01:53 -0400906 /*
907 * The device doesn't give us the IV so we won't be
908 * able to look up the key. That's ok though, we
909 * don't need to decrypt the frame, we just won't
910 * be able to keep statistics accurate.
911 * Except for key threshold notifications, should
912 * we somehow allow the driver to tell us which key
913 * the hardware used if this flag is set?
914 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100915 if ((status->flag & RX_FLAG_DECRYPTED) &&
916 (status->flag & RX_FLAG_IV_STRIPPED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100917 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200918
Johannes Berg761ab472010-05-28 14:24:19 +0200919 hdrlen = ieee80211_hdrlen(fc);
Johannes Berg571ecf62007-07-27 15:43:22 +0200920
Johannes Berg3017b802007-08-28 17:01:53 -0400921 if (rx->skb->len < 8 + hdrlen)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100922 return RX_DROP_UNUSABLE; /* TODO: count this? */
Johannes Berg571ecf62007-07-27 15:43:22 +0200923
Johannes Berg3017b802007-08-28 17:01:53 -0400924 /*
925 * no need to call ieee80211_wep_get_keyidx,
926 * it verifies a bunch of things we've done already
927 */
Zhu Yi39184b12010-04-08 15:35:10 +0800928 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
929 keyidx = keyid >> 6;
Johannes Berg3017b802007-08-28 17:01:53 -0400930
Johannes Bergd4e46a32007-09-14 11:10:24 -0400931 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
Johannes Berg3017b802007-08-28 17:01:53 -0400932
933 /*
934 * RSNA-protected unicast frames should always be sent with
935 * pairwise or station-to-station keys, but for WEP we allow
936 * using a key index as well.
937 */
Johannes Berg8f20fc22007-08-28 17:01:54 -0400938 if (rx->key && rx->key->conf.alg != ALG_WEP &&
Johannes Berg3017b802007-08-28 17:01:53 -0400939 !is_multicast_ether_addr(hdr->addr1))
940 rx->key = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +0200941 }
942
Johannes Berg3017b802007-08-28 17:01:53 -0400943 if (rx->key) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200944 rx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -0400945 /* TODO: add threshold stuff again */
Johannes Berg1990af82007-09-26 17:53:15 +0200946 } else {
Johannes Berge4c26ad2008-01-31 19:48:21 +0100947 return RX_DROP_MONITOR;
Johannes Berg70f08762007-09-26 17:53:14 +0200948 }
949
Zhu Yi39184b12010-04-08 15:35:10 +0800950 if (skb_linearize(rx->skb))
951 return RX_DROP_UNUSABLE;
Johannes Berg761ab472010-05-28 14:24:19 +0200952 /* the hdr variable is invalid now! */
Johannes Berg1990af82007-09-26 17:53:15 +0200953
Johannes Berg70f08762007-09-26 17:53:14 +0200954 switch (rx->key->conf.alg) {
955 case ALG_WEP:
Johannes Berg761ab472010-05-28 14:24:19 +0200956 /* Check for weak IVs if possible */
957 if (rx->sta && ieee80211_is_data(fc) &&
958 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
959 !(status->flag & RX_FLAG_DECRYPTED)) &&
960 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
961 rx->sta->wep_weak_iv_count++;
962
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200963 result = ieee80211_crypto_wep_decrypt(rx);
964 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200965 case ALG_TKIP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200966 result = ieee80211_crypto_tkip_decrypt(rx);
967 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200968 case ALG_CCMP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200969 result = ieee80211_crypto_ccmp_decrypt(rx);
970 break;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200971 case ALG_AES_CMAC:
972 result = ieee80211_crypto_aes_cmac_decrypt(rx);
973 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200974 }
975
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200976 /* either the frame has been decrypted or will be dropped */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100977 status->flag |= RX_FLAG_DECRYPTED;
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200978
979 return result;
Johannes Berg70f08762007-09-26 17:53:14 +0200980}
981
Kalle Valo572e0012009-02-10 17:09:31 +0200982static ieee80211_rx_result debug_noinline
983ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
984{
985 struct ieee80211_local *local;
986 struct ieee80211_hdr *hdr;
987 struct sk_buff *skb;
988
989 local = rx->local;
990 skb = rx->skb;
991 hdr = (struct ieee80211_hdr *) skb->data;
992
993 if (!local->pspolling)
994 return RX_CONTINUE;
995
996 if (!ieee80211_has_fromds(hdr->frame_control))
997 /* this is not from AP */
998 return RX_CONTINUE;
999
1000 if (!ieee80211_is_data(hdr->frame_control))
1001 return RX_CONTINUE;
1002
1003 if (!ieee80211_has_moredata(hdr->frame_control)) {
1004 /* AP has no more frames buffered for us */
1005 local->pspolling = false;
1006 return RX_CONTINUE;
1007 }
1008
1009 /* more data bit is set, let's request a new frame from the AP */
1010 ieee80211_send_pspoll(local, rx->sdata);
1011
1012 return RX_CONTINUE;
1013}
1014
Johannes Berg133b8222008-09-16 14:18:59 +02001015static void ap_sta_ps_start(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001016{
Johannes Berg133b8222008-09-16 14:18:59 +02001017 struct ieee80211_sub_if_data *sdata = sta->sdata;
Christian Lamparter4571d3b2008-11-30 00:48:41 +01001018 struct ieee80211_local *local = sdata->local;
Joe Perches0795af52007-10-03 17:59:30 -07001019
Johannes Berg3e122be2008-07-09 14:40:34 +02001020 atomic_inc(&sdata->bss->num_sta_ps);
Johannes Bergaf818582009-11-06 11:35:50 +01001021 set_sta_flags(sta, WLAN_STA_PS_STA);
Johannes Berg12375ef2009-11-25 20:30:31 +01001022 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001023#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001024 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001025 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001026#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1027}
1028
Johannes Bergff9458d2009-10-30 12:56:02 +01001029static void ap_sta_ps_end(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001030{
Johannes Berg133b8222008-09-16 14:18:59 +02001031 struct ieee80211_sub_if_data *sdata = sta->sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02001032
Johannes Berg3e122be2008-07-09 14:40:34 +02001033 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg004c8722008-02-20 11:21:35 +01001034
Johannes Bergaf818582009-11-06 11:35:50 +01001035 clear_sta_flags(sta, WLAN_STA_PS_STA);
Johannes Berg004c8722008-02-20 11:21:35 +01001036
Johannes Berg571ecf62007-07-27 15:43:22 +02001037#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001038 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001039 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001040#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg004c8722008-02-20 11:21:35 +01001041
Johannes Bergaf818582009-11-06 11:35:50 +01001042 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001043#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Bergaf818582009-11-06 11:35:50 +01001044 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001045 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001046#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Bergaf818582009-11-06 11:35:50 +01001047 return;
1048 }
1049
1050 ieee80211_sta_ps_deliver_wakeup(sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001051}
1052
Johannes Berg49461622008-06-30 15:10:45 +02001053static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001054ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001055{
1056 struct sta_info *sta = rx->sta;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001057 struct sk_buff *skb = rx->skb;
1058 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1059 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001060
1061 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001062 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001063
Johannes Bergb291ba12009-07-10 15:29:03 +02001064 /*
1065 * Update last_rx only for IBSS packets which are for the current
1066 * BSSID to avoid keeping the current IBSS network alive in cases
1067 * where other STAs start using different BSSID.
1068 */
Johannes Berg05c914f2008-09-11 00:01:58 +02001069 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001070 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +02001071 NL80211_IFTYPE_ADHOC);
Johannes Berg46900292009-02-15 12:44:28 +01001072 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
Johannes Berg571ecf62007-07-27 15:43:22 +02001073 sta->last_rx = jiffies;
Johannes Bergb291ba12009-07-10 15:29:03 +02001074 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1075 /*
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001076 * Mesh beacons will update last_rx when if they are found to
1077 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +02001078 */
Johannes Bergb291ba12009-07-10 15:29:03 +02001079 sta->last_rx = jiffies;
Johannes Berg571ecf62007-07-27 15:43:22 +02001080 }
1081
Johannes Berg5cf121c2008-02-25 16:27:43 +01001082 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001083 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001084
Kalle Valo3cf335d2009-03-22 21:57:06 +02001085 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1086 ieee80211_sta_rx_notify(rx->sdata, hdr);
1087
Johannes Berg571ecf62007-07-27 15:43:22 +02001088 sta->rx_fragments++;
1089 sta->rx_bytes += rx->skb->len;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001090 sta->last_signal = status->signal;
Johannes Berg571ecf62007-07-27 15:43:22 +02001091
Johannes Berg72eaa432008-11-26 15:02:58 +01001092 /*
1093 * Change STA power saving mode only at the end of a frame
1094 * exchange sequence.
1095 */
Johannes Berg3e122be2008-07-09 14:40:34 +02001096 if (!ieee80211_has_morefrags(hdr->frame_control) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001097 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1098 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
Johannes Bergaf818582009-11-06 11:35:50 +01001099 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
Johannes Berg72eaa432008-11-26 15:02:58 +01001100 /*
1101 * Ignore doze->wake transitions that are
1102 * indicated by non-data frames, the standard
1103 * is unclear here, but for example going to
1104 * PS mode and then scanning would cause a
1105 * doze->wake transition for the probe request,
1106 * and that is clearly undesirable.
1107 */
1108 if (ieee80211_is_data(hdr->frame_control) &&
1109 !ieee80211_has_pm(hdr->frame_control))
Johannes Bergff9458d2009-10-30 12:56:02 +01001110 ap_sta_ps_end(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001111 } else {
1112 if (ieee80211_has_pm(hdr->frame_control))
1113 ap_sta_ps_start(sta);
1114 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001115 }
1116
Johannes Berg22403de2009-10-30 12:55:03 +01001117 /*
1118 * Drop (qos-)data::nullfunc frames silently, since they
1119 * are used only to control station power saving mode.
1120 */
1121 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1122 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001123 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
Felix Fietkaud5242152010-01-08 18:06:26 +01001124
1125 /*
1126 * If we receive a 4-addr nullfunc frame from a STA
1127 * that was not moved to a 4-addr STA vlan yet, drop
1128 * the frame to the monitor interface, to make sure
1129 * that hostapd sees it
1130 */
1131 if (ieee80211_has_a4(hdr->frame_control) &&
1132 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1133 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1134 !rx->sdata->u.vlan.sta)))
1135 return RX_DROP_MONITOR;
Johannes Berg22403de2009-10-30 12:55:03 +01001136 /*
1137 * Update counter and free packet here to avoid
1138 * counting this as a dropped packed.
1139 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001140 sta->rx_packets++;
1141 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001142 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001143 }
1144
Johannes Berg9ae54c82008-01-31 19:48:20 +01001145 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001146} /* ieee80211_rx_h_sta_process */
1147
Johannes Berg571ecf62007-07-27 15:43:22 +02001148static inline struct ieee80211_fragment_entry *
1149ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1150 unsigned int frag, unsigned int seq, int rx_queue,
1151 struct sk_buff **skb)
1152{
1153 struct ieee80211_fragment_entry *entry;
1154 int idx;
1155
1156 idx = sdata->fragment_next;
1157 entry = &sdata->fragments[sdata->fragment_next++];
1158 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1159 sdata->fragment_next = 0;
1160
1161 if (!skb_queue_empty(&entry->skb_list)) {
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001162#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg571ecf62007-07-27 15:43:22 +02001163 struct ieee80211_hdr *hdr =
1164 (struct ieee80211_hdr *) entry->skb_list.next->data;
1165 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1166 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
Johannes Berg0c68ae262008-10-27 15:56:10 -07001167 "addr1=%pM addr2=%pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001168 sdata->name, idx,
Johannes Berg571ecf62007-07-27 15:43:22 +02001169 jiffies - entry->first_frag_time, entry->seq,
Johannes Berg0c68ae262008-10-27 15:56:10 -07001170 entry->last_frag, hdr->addr1, hdr->addr2);
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001171#endif
Johannes Berg571ecf62007-07-27 15:43:22 +02001172 __skb_queue_purge(&entry->skb_list);
1173 }
1174
1175 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1176 *skb = NULL;
1177 entry->first_frag_time = jiffies;
1178 entry->seq = seq;
1179 entry->rx_queue = rx_queue;
1180 entry->last_frag = frag;
1181 entry->ccmp = 0;
1182 entry->extra_len = 0;
1183
1184 return entry;
1185}
1186
1187static inline struct ieee80211_fragment_entry *
1188ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001189 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +02001190 int rx_queue, struct ieee80211_hdr *hdr)
1191{
1192 struct ieee80211_fragment_entry *entry;
1193 int i, idx;
1194
1195 idx = sdata->fragment_next;
1196 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1197 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +02001198
1199 idx--;
1200 if (idx < 0)
1201 idx = IEEE80211_FRAGMENT_MAX - 1;
1202
1203 entry = &sdata->fragments[idx];
1204 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1205 entry->rx_queue != rx_queue ||
1206 entry->last_frag + 1 != frag)
1207 continue;
1208
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001209 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001210
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001211 /*
1212 * Check ftype and addresses are equal, else check next fragment
1213 */
1214 if (((hdr->frame_control ^ f_hdr->frame_control) &
1215 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001216 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1217 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1218 continue;
1219
S.Çağlar Onurab466232008-02-14 17:36:47 +02001220 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001221 __skb_queue_purge(&entry->skb_list);
1222 continue;
1223 }
1224 return entry;
1225 }
1226
1227 return NULL;
1228}
1229
Johannes Berg49461622008-06-30 15:10:45 +02001230static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001231ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001232{
1233 struct ieee80211_hdr *hdr;
1234 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001235 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001236 unsigned int frag, seq;
1237 struct ieee80211_fragment_entry *entry;
1238 struct sk_buff *skb;
1239
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001240 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001241 fc = hdr->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02001242 sc = le16_to_cpu(hdr->seq_ctrl);
1243 frag = sc & IEEE80211_SCTL_FRAG;
1244
Harvey Harrison358c8d92008-07-15 18:44:13 -07001245 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001246 (rx->skb)->len < 24 ||
1247 is_multicast_ether_addr(hdr->addr1))) {
1248 /* not fragmented */
1249 goto out;
1250 }
1251 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1252
Zhu Yie3cf8b32010-03-29 17:35:07 +08001253 if (skb_linearize(rx->skb))
1254 return RX_DROP_UNUSABLE;
1255
Abhijeet Kolekar058897a2010-05-11 11:22:11 -07001256 /*
1257 * skb_linearize() might change the skb->data and
1258 * previously cached variables (in this case, hdr) need to
1259 * be refreshed with the new data.
1260 */
1261 hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001262 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1263
1264 if (frag == 0) {
1265 /* This is the first fragment of a new frame. */
1266 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001267 rx->queue, &(rx->skb));
Johannes Berg8f20fc22007-08-28 17:01:54 -04001268 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
Harvey Harrison358c8d92008-07-15 18:44:13 -07001269 ieee80211_has_protected(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001270 /* Store CCMP PN so that we can verify that the next
1271 * fragment has a sequential PN value. */
1272 entry->ccmp = 1;
1273 memcpy(entry->last_pn,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001274 rx->key->u.ccmp.rx_pn[rx->queue],
Johannes Berg571ecf62007-07-27 15:43:22 +02001275 CCMP_PN_LEN);
1276 }
Johannes Berg9ae54c82008-01-31 19:48:20 +01001277 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001278 }
1279
1280 /* This is a fragment for a frame that should already be pending in
1281 * fragment cache. Add this fragment to the end of the pending entry.
1282 */
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001283 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001284 if (!entry) {
1285 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001286 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001287 }
1288
1289 /* Verify that MPDUs within one MSDU have sequential PN values.
1290 * (IEEE 802.11i, 8.3.3.4.5) */
1291 if (entry->ccmp) {
1292 int i;
1293 u8 pn[CCMP_PN_LEN], *rpn;
Johannes Berg8f20fc22007-08-28 17:01:54 -04001294 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001295 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001296 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1297 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1298 pn[i]++;
1299 if (pn[i])
1300 break;
1301 }
Johannes Berg5cf121c2008-02-25 16:27:43 +01001302 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001303 if (memcmp(pn, rpn, CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001304 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001305 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1306 }
1307
Harvey Harrison358c8d92008-07-15 18:44:13 -07001308 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +02001309 __skb_queue_tail(&entry->skb_list, rx->skb);
1310 entry->last_frag = frag;
1311 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001312 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001313 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001314 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001315 }
1316
1317 rx->skb = __skb_dequeue(&entry->skb_list);
1318 if (skb_tailroom(rx->skb) < entry->extra_len) {
1319 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1320 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1321 GFP_ATOMIC))) {
1322 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1323 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001324 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001325 }
1326 }
1327 while ((skb = __skb_dequeue(&entry->skb_list))) {
1328 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1329 dev_kfree_skb(skb);
1330 }
1331
1332 /* Complete frame has been reassembled - process it now */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001333 rx->flags |= IEEE80211_RX_FRAGMENTED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001334
1335 out:
1336 if (rx->sta)
1337 rx->sta->rx_packets++;
1338 if (is_multicast_ether_addr(hdr->addr1))
1339 rx->local->dot11MulticastReceivedFrameCount++;
1340 else
1341 ieee80211_led_rx(rx->local);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001342 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001343}
1344
Johannes Berg49461622008-06-30 15:10:45 +02001345static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001346ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001347{
Johannes Bergaf818582009-11-06 11:35:50 +01001348 struct ieee80211_sub_if_data *sdata = rx->sdata;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001349 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02001350
Harvey Harrison358c8d92008-07-15 18:44:13 -07001351 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
Johannes Berg5cf121c2008-02-25 16:27:43 +01001352 !(rx->flags & IEEE80211_RX_RA_MATCH)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001353 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001354
Johannes Berg05c914f2008-09-11 00:01:58 +02001355 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1356 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001357 return RX_DROP_UNUSABLE;
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +02001358
Johannes Bergaf818582009-11-06 11:35:50 +01001359 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1360 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1361 else
1362 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
Johannes Berg571ecf62007-07-27 15:43:22 +02001363
Johannes Berg9ae54c82008-01-31 19:48:20 +01001364 /* Free PS Poll skb here instead of returning RX_DROP that would
Johannes Berg571ecf62007-07-27 15:43:22 +02001365 * count as an dropped frame. */
1366 dev_kfree_skb(rx->skb);
1367
Johannes Berg9ae54c82008-01-31 19:48:20 +01001368 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001369}
1370
Johannes Berg49461622008-06-30 15:10:45 +02001371static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001372ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +02001373{
Johannes Berg6e0d1142007-07-27 15:43:22 +02001374 u8 *data = rx->skb->data;
Harvey Harrison238f74a2008-07-02 11:05:34 -07001375 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001376
Harvey Harrison238f74a2008-07-02 11:05:34 -07001377 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001378 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001379
1380 /* remove the qos control field, update frame type and meta-data */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001381 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1382 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1383 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001384 /* change frame type to non QOS */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001385 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001386
Johannes Berg9ae54c82008-01-31 19:48:20 +01001387 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001388}
1389
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001390static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001391ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001392{
Johannes Berg07346f812008-05-03 01:02:02 +02001393 if (unlikely(!rx->sta ||
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001394 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001395 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001396
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001397 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001398}
1399
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001400static int
Harvey Harrison358c8d92008-07-15 18:44:13 -07001401ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02001402{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001403 struct sk_buff *skb = rx->skb;
1404 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1405
Johannes Berg3017b802007-08-28 17:01:53 -04001406 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001407 * Pass through unencrypted frames if the hardware has
1408 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001409 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001410 if (status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001411 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001412
1413 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001414 if (unlikely(!ieee80211_has_protected(fc) &&
1415 !ieee80211_is_nullfunc(fc) &&
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001416 ieee80211_is_data(fc) &&
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +02001417 (rx->key || rx->sdata->drop_unencrypted)))
1418 return -EACCES;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001419
1420 return 0;
1421}
1422
1423static int
1424ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1425{
1426 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Jouni Malinene3efca02010-03-28 22:31:15 -07001427 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001428 __le16 fc = hdr->frame_control;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001429
Jouni Malinene3efca02010-03-28 22:31:15 -07001430 /*
1431 * Pass through unencrypted frames if the hardware has
1432 * decrypted them already.
1433 */
1434 if (status->flag & RX_FLAG_DECRYPTED)
1435 return 0;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001436
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001437 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
Jouni Malinend211e902010-03-28 22:29:52 -07001438 if (unlikely(!ieee80211_has_protected(fc) &&
1439 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001440 rx->key))
1441 return -EACCES;
1442 /* BIP does not use Protected field, so need to check MMIE */
Joe Perchesf64f9e72009-11-29 16:55:45 -08001443 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinenfa83a212010-03-29 23:36:15 -07001444 ieee80211_get_mmie_keyidx(rx->skb) < 0))
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001445 return -EACCES;
1446 /*
1447 * When using MFP, Action frames are not allowed prior to
1448 * having configured keys.
1449 */
1450 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1451 ieee80211_is_robust_mgmt_frame(
1452 (struct ieee80211_hdr *) rx->skb->data)))
1453 return -EACCES;
1454 }
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001455
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001456 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001457}
1458
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001459static int
Zhu Yie31a16d2009-05-21 21:47:03 +08001460__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001461{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001462 struct ieee80211_sub_if_data *sdata = rx->sdata;
Felix Fietkauf14543e2009-11-10 20:10:05 +01001463 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1464
Johannes Berg9bc383d2009-11-19 11:55:19 +01001465 if (ieee80211_has_a4(hdr->frame_control) &&
1466 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
Felix Fietkauf14543e2009-11-10 20:10:05 +01001467 return -1;
Johannes Berg9bc383d2009-11-19 11:55:19 +01001468
1469 if (is_multicast_ether_addr(hdr->addr1) &&
1470 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1471 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
Felix Fietkauf14543e2009-11-10 20:10:05 +01001472 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001473
Johannes Berg47846c92009-11-25 17:46:19 +01001474 return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001475}
Johannes Berg571ecf62007-07-27 15:43:22 +02001476
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001477/*
1478 * requires that rx->skb is a frame with ethernet header
1479 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001480static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001481{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301482 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001483 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1484 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1485
1486 /*
1487 * Allow EAPOL frames to us/the PAE group address regardless
1488 * of whether the frame was encrypted or not.
1489 */
1490 if (ehdr->h_proto == htons(ETH_P_PAE) &&
Johannes Berg47846c92009-11-25 17:46:19 +01001491 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001492 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1493 return true;
1494
1495 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07001496 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001497 return false;
1498
1499 return true;
1500}
1501
1502/*
1503 * requires that rx->skb is a frame with ethernet header
1504 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001505static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01001506ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001507{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001508 struct ieee80211_sub_if_data *sdata = rx->sdata;
1509 struct net_device *dev = sdata->dev;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001510 struct sk_buff *skb, *xmit_skb;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001511 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1512 struct sta_info *dsta;
Johannes Berg571ecf62007-07-27 15:43:22 +02001513
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001514 skb = rx->skb;
1515 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001516
Johannes Berg05c914f2008-09-11 00:01:58 +02001517 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1518 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02001519 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg9bc383d2009-11-19 11:55:19 +01001520 (rx->flags & IEEE80211_RX_RA_MATCH) &&
1521 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001522 if (is_multicast_ether_addr(ehdr->h_dest)) {
1523 /*
1524 * send multicast frames both to higher layers in
1525 * local net stack and back to the wireless medium
1526 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001527 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1528 if (!xmit_skb && net_ratelimit())
Johannes Berg571ecf62007-07-27 15:43:22 +02001529 printk(KERN_DEBUG "%s: failed to clone "
1530 "multicast frame\n", dev->name);
1531 } else {
Johannes Bergabe60632009-11-25 17:46:18 +01001532 dsta = sta_info_get(sdata, skb->data);
1533 if (dsta) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001534 /*
1535 * The destination station is associated to
1536 * this AP (in this VLAN), so send the frame
1537 * directly to it and do not pass it to local
1538 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02001539 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001540 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001541 skb = NULL;
1542 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001543 }
1544 }
1545
1546 if (skb) {
Johannes Bergd1c3a372009-01-07 00:26:10 +01001547 int align __maybe_unused;
1548
Kalle Valo59d9cb02009-12-17 13:54:57 +01001549#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
Johannes Bergd1c3a372009-01-07 00:26:10 +01001550 /*
1551 * 'align' will only take the values 0 or 2 here
1552 * since all frames are required to be aligned
1553 * to 2-byte boundaries when being passed to
1554 * mac80211. That also explains the __skb_push()
1555 * below.
1556 */
matthieu castetdacb6f12009-06-04 22:16:18 +02001557 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01001558 if (align) {
1559 if (WARN_ON(skb_headroom(skb) < 3)) {
1560 dev_kfree_skb(skb);
1561 skb = NULL;
1562 } else {
1563 u8 *data = skb->data;
Zhu Yi8ce0b582009-10-28 13:13:52 -07001564 size_t len = skb_headlen(skb);
1565 skb->data -= align;
1566 memmove(skb->data, data, len);
1567 skb_set_tail_pointer(skb, len);
Johannes Bergd1c3a372009-01-07 00:26:10 +01001568 }
1569 }
1570#endif
1571
1572 if (skb) {
1573 /* deliver to local stack */
1574 skb->protocol = eth_type_trans(skb, dev);
1575 memset(skb->cb, 0, sizeof(skb->cb));
1576 netif_rx(skb);
1577 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001578 }
1579
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001580 if (xmit_skb) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001581 /* send to wireless media */
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09001582 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001583 skb_reset_network_header(xmit_skb);
1584 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001585 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001586 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001587}
1588
Johannes Berg49461622008-06-30 15:10:45 +02001589static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001590ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001591{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001592 struct net_device *dev = rx->sdata->dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001593 struct sk_buff *skb = rx->skb;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001594 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1595 __le16 fc = hdr->frame_control;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001596 struct sk_buff_head frame_list;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001597
Harvey Harrison358c8d92008-07-15 18:44:13 -07001598 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001599 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001600
Harvey Harrison358c8d92008-07-15 18:44:13 -07001601 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001602 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001603
Johannes Berg5cf121c2008-02-25 16:27:43 +01001604 if (!(rx->flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001605 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001606
Zhu Yieaf85ca2009-12-01 10:18:37 +08001607 if (ieee80211_has_a4(hdr->frame_control) &&
1608 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1609 !rx->sdata->u.vlan.sta)
1610 return RX_DROP_UNUSABLE;
1611
1612 if (is_multicast_ether_addr(hdr->addr1) &&
1613 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1614 rx->sdata->u.vlan.sta) ||
1615 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1616 rx->sdata->u.mgd.use_4addr)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001617 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001618
1619 skb->dev = dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001620 __skb_queue_head_init(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001621
Zhu Yie3cf8b32010-03-29 17:35:07 +08001622 if (skb_linearize(skb))
1623 return RX_DROP_UNUSABLE;
1624
Zhu Yieaf85ca2009-12-01 10:18:37 +08001625 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1626 rx->sdata->vif.type,
1627 rx->local->hw.extra_tx_headroom);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001628
Zhu Yieaf85ca2009-12-01 10:18:37 +08001629 while (!skb_queue_empty(&frame_list)) {
1630 rx->skb = __skb_dequeue(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001631
Harvey Harrison358c8d92008-07-15 18:44:13 -07001632 if (!ieee80211_frame_allowed(rx, fc)) {
Zhu Yieaf85ca2009-12-01 10:18:37 +08001633 dev_kfree_skb(rx->skb);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001634 continue;
1635 }
Zhu Yieaf85ca2009-12-01 10:18:37 +08001636 dev->stats.rx_packets++;
1637 dev->stats.rx_bytes += rx->skb->len;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001638
1639 ieee80211_deliver_skb(rx);
1640 }
1641
Johannes Berg9ae54c82008-01-31 19:48:20 +01001642 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001643}
1644
Ingo Molnarbf94e172008-10-12 23:51:38 -07001645#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02001646static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001647ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1648{
1649 struct ieee80211_hdr *hdr;
1650 struct ieee80211s_hdr *mesh_hdr;
1651 unsigned int hdrlen;
1652 struct sk_buff *skb = rx->skb, *fwd_skb;
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001653 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001654 struct ieee80211_sub_if_data *sdata = rx->sdata;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001655
1656 hdr = (struct ieee80211_hdr *) skb->data;
1657 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1658 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1659
1660 if (!ieee80211_is_data(hdr->frame_control))
1661 return RX_CONTINUE;
1662
1663 if (!mesh_hdr->ttl)
1664 /* illegal frame */
1665 return RX_DROP_MONITOR;
1666
Javier Cardona43b7b312009-10-15 18:10:51 -07001667 if (mesh_hdr->flags & MESH_FLAGS_AE) {
YanBo79617de2008-09-22 13:30:32 +08001668 struct mesh_path *mppath;
Javier Cardona43b7b312009-10-15 18:10:51 -07001669 char *proxied_addr;
1670 char *mpp_addr;
1671
1672 if (is_multicast_ether_addr(hdr->addr1)) {
1673 mpp_addr = hdr->addr3;
1674 proxied_addr = mesh_hdr->eaddr1;
1675 } else {
1676 mpp_addr = hdr->addr4;
1677 proxied_addr = mesh_hdr->eaddr2;
1678 }
YanBo79617de2008-09-22 13:30:32 +08001679
YanBo79617de2008-09-22 13:30:32 +08001680 rcu_read_lock();
Javier Cardona43b7b312009-10-15 18:10:51 -07001681 mppath = mpp_path_lookup(proxied_addr, sdata);
YanBo79617de2008-09-22 13:30:32 +08001682 if (!mppath) {
Javier Cardona43b7b312009-10-15 18:10:51 -07001683 mpp_path_add(proxied_addr, mpp_addr, sdata);
YanBo79617de2008-09-22 13:30:32 +08001684 } else {
1685 spin_lock_bh(&mppath->state_lock);
Javier Cardona43b7b312009-10-15 18:10:51 -07001686 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1687 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
YanBo79617de2008-09-22 13:30:32 +08001688 spin_unlock_bh(&mppath->state_lock);
1689 }
1690 rcu_read_unlock();
1691 }
1692
Javier Cardona3c5772a2009-08-10 12:15:48 -07001693 /* Frame has reached destination. Don't forward */
1694 if (!is_multicast_ether_addr(hdr->addr1) &&
Johannes Berg47846c92009-11-25 17:46:19 +01001695 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001696 return RX_CONTINUE;
1697
1698 mesh_hdr->ttl--;
1699
1700 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1701 if (!mesh_hdr->ttl)
Johannes Berg472dbc42008-09-11 00:01:49 +02001702 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001703 dropped_frames_ttl);
1704 else {
1705 struct ieee80211_hdr *fwd_hdr;
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001706 struct ieee80211_tx_info *info;
1707
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001708 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1709
1710 if (!fwd_skb && net_ratelimit())
1711 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001712 sdata->name);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001713
1714 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
Johannes Berg47846c92009-11-25 17:46:19 +01001715 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001716 info = IEEE80211_SKB_CB(fwd_skb);
1717 memset(info, 0, sizeof(*info));
1718 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
Johannes Berg5061b0c2009-07-14 00:33:34 +02001719 info->control.vif = &rx->sdata->vif;
Johannes Bergcf0277e2010-01-05 18:00:58 +01001720 skb_set_queue_mapping(skb,
1721 ieee80211_select_queue(rx->sdata, fwd_skb));
1722 ieee80211_set_qos_hdr(local, skb);
Daniel Walkerc8a61a72009-08-18 10:59:00 -07001723 if (is_multicast_ether_addr(fwd_hdr->addr1))
1724 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1725 fwded_mcast);
1726 else {
Javier Cardona3c5772a2009-08-10 12:15:48 -07001727 int err;
1728 /*
1729 * Save TA to addr1 to send TA a path error if a
1730 * suitable next hop is not found
1731 */
1732 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
Javier Cardona249b4052009-07-07 10:55:03 -07001733 ETH_ALEN);
Javier Cardona3c5772a2009-08-10 12:15:48 -07001734 err = mesh_nexthop_lookup(fwd_skb, sdata);
Javier Cardona249b4052009-07-07 10:55:03 -07001735 /* Failed to immediately resolve next hop:
1736 * fwded frame was dropped or will be added
1737 * later to the pending skb queue. */
1738 if (err)
1739 return RX_DROP_MONITOR;
Daniel Walkerc8a61a72009-08-18 10:59:00 -07001740
1741 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1742 fwded_unicast);
Javier Cardona249b4052009-07-07 10:55:03 -07001743 }
1744 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1745 fwded_frames);
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001746 ieee80211_add_pending_skb(local, fwd_skb);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001747 }
1748 }
1749
Javier Cardona3c5772a2009-08-10 12:15:48 -07001750 if (is_multicast_ether_addr(hdr->addr1) ||
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001751 sdata->dev->flags & IFF_PROMISC)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001752 return RX_CONTINUE;
1753 else
1754 return RX_DROP_MONITOR;
1755}
Ingo Molnarbf94e172008-10-12 23:51:38 -07001756#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001757
1758static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001759ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001760{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001761 struct ieee80211_sub_if_data *sdata = rx->sdata;
Vivek Natarajane15276a2010-02-08 17:47:01 +05301762 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001763 struct net_device *dev = sdata->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001764 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1765 __le16 fc = hdr->frame_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001766 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001767
Harvey Harrison358c8d92008-07-15 18:44:13 -07001768 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001769 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001770
Harvey Harrison358c8d92008-07-15 18:44:13 -07001771 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001772 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001773
Felix Fietkauf14543e2009-11-10 20:10:05 +01001774 /*
1775 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1776 * that a 4-addr station can be detected and moved into a separate VLAN
1777 */
1778 if (ieee80211_has_a4(hdr->frame_control) &&
1779 sdata->vif.type == NL80211_IFTYPE_AP)
1780 return RX_DROP_MONITOR;
1781
Zhu Yie31a16d2009-05-21 21:47:03 +08001782 err = __ieee80211_data_to_8023(rx);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001783 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001784 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001785
Harvey Harrison358c8d92008-07-15 18:44:13 -07001786 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001787 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001788
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001789 rx->skb->dev = dev;
1790
1791 dev->stats.rx_packets++;
1792 dev->stats.rx_bytes += rx->skb->len;
1793
Vivek Natarajane15276a2010-02-08 17:47:01 +05301794 if (ieee80211_is_data(hdr->frame_control) &&
1795 !is_multicast_ether_addr(hdr->addr1) &&
1796 local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) {
1797 mod_timer(&local->dynamic_ps_timer, jiffies +
1798 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1799 }
1800
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001801 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02001802
Johannes Berg9ae54c82008-01-31 19:48:20 +01001803 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001804}
1805
Johannes Berg49461622008-06-30 15:10:45 +02001806static ieee80211_rx_result debug_noinline
Johannes Berg2569a822009-11-25 17:46:17 +01001807ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
Ron Rindjunsky71364712007-12-25 17:00:36 +02001808{
1809 struct ieee80211_local *local = rx->local;
1810 struct ieee80211_hw *hw = &local->hw;
1811 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07001812 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001813 struct tid_ampdu_rx *tid_agg_rx;
1814 u16 start_seq_num;
1815 u16 tid;
1816
Harvey Harrisona7767f92008-07-02 16:30:51 -07001817 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001818 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001819
Harvey Harrisona7767f92008-07-02 16:30:51 -07001820 if (ieee80211_is_back_req(bar->frame_control)) {
Johannes Berg8ae59772010-05-30 14:52:58 +02001821 struct {
1822 __le16 control, start_seq_num;
1823 } __packed bar_data;
1824
Ron Rindjunsky71364712007-12-25 17:00:36 +02001825 if (!rx->sta)
Johannes Berga02ae752009-11-16 12:00:40 +01001826 return RX_DROP_MONITOR;
Johannes Berg8ae59772010-05-30 14:52:58 +02001827
1828 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1829 &bar_data, sizeof(bar_data)))
1830 return RX_DROP_MONITOR;
1831
Johannes Berg8ae59772010-05-30 14:52:58 +02001832 tid = le16_to_cpu(bar_data.control) >> 12;
Johannes Berga87f7362010-06-10 10:21:38 +02001833
1834 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1835 if (!tid_agg_rx)
Johannes Berga02ae752009-11-16 12:00:40 +01001836 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001837
Johannes Berg8ae59772010-05-30 14:52:58 +02001838 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001839
1840 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01001841 if (tid_agg_rx->timeout)
1842 mod_timer(&tid_agg_rx->session_timer,
1843 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02001844
Johannes Berga02ae752009-11-16 12:00:40 +01001845 /* release stored frames up to start of BAR */
Johannes Berg2569a822009-11-25 17:46:17 +01001846 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1847 frames);
Johannes Berga02ae752009-11-16 12:00:40 +01001848 kfree_skb(skb);
1849 return RX_QUEUED;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001850 }
1851
Johannes Berg08daeca2010-05-30 14:53:43 +02001852 /*
1853 * After this point, we only want management frames,
1854 * so we can drop all remaining control frames to
1855 * cooked monitor interfaces.
1856 */
1857 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001858}
1859
Jouni Malinenf4f727a2009-01-10 11:46:53 +02001860static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1861 struct ieee80211_mgmt *mgmt,
1862 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02001863{
1864 struct ieee80211_local *local = sdata->local;
1865 struct sk_buff *skb;
1866 struct ieee80211_mgmt *resp;
1867
Johannes Berg47846c92009-11-25 17:46:19 +01001868 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
Jouni Malinenfea14732009-01-08 13:32:06 +02001869 /* Not to own unicast address */
1870 return;
1871 }
1872
Johannes Berg46900292009-02-15 12:44:28 +01001873 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1874 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
Johannes Berg77fdaa12009-07-07 03:45:17 +02001875 /* Not from the current AP or not associated yet. */
Jouni Malinenfea14732009-01-08 13:32:06 +02001876 return;
1877 }
1878
1879 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1880 /* Too short SA Query request frame */
1881 return;
1882 }
1883
1884 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1885 if (skb == NULL)
1886 return;
1887
1888 skb_reserve(skb, local->hw.extra_tx_headroom);
1889 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1890 memset(resp, 0, 24);
1891 memcpy(resp->da, mgmt->sa, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01001892 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01001893 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02001894 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1895 IEEE80211_STYPE_ACTION);
1896 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1897 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1898 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1899 memcpy(resp->u.action.u.sa_query.trans_id,
1900 mgmt->u.action.u.sa_query.trans_id,
1901 WLAN_SA_QUERY_TR_ID_LEN);
1902
Johannes Berg62ae67b2009-11-18 18:42:05 +01001903 ieee80211_tx_skb(sdata, skb);
Jouni Malinenfea14732009-01-08 13:32:06 +02001904}
1905
Johannes Berg49461622008-06-30 15:10:45 +02001906static ieee80211_rx_result debug_noinline
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001907ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1908{
1909 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001910 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001911 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg84040802010-02-15 12:46:39 +02001912 struct sk_buff *nskb;
Jouni Malinen026331c2010-02-15 12:53:10 +02001913 struct ieee80211_rx_status *status;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001914 int len = rx->skb->len;
1915
1916 if (!ieee80211_is_action(mgmt->frame_control))
1917 return RX_CONTINUE;
1918
Jouni Malinen026331c2010-02-15 12:53:10 +02001919 /* drop too small frames */
1920 if (len < IEEE80211_MIN_ACTION_SIZE)
1921 return RX_DROP_UNUSABLE;
1922
1923 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
Johannes Berg84040802010-02-15 12:46:39 +02001924 return RX_DROP_UNUSABLE;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001925
1926 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg84040802010-02-15 12:46:39 +02001927 return RX_DROP_UNUSABLE;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001928
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001929 if (ieee80211_drop_unencrypted_mgmt(rx))
Johannes Berg84040802010-02-15 12:46:39 +02001930 return RX_DROP_UNUSABLE;
Jouni Malinen97ebe122009-01-08 13:32:08 +02001931
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001932 switch (mgmt->u.action.category) {
1933 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01001934 /*
1935 * The aggregation code is not prepared to handle
1936 * anything but STA/AP due to the BSSID handling;
1937 * IBSS could work in the code but isn't supported
1938 * by drivers or the standard.
1939 */
1940 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1941 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1942 sdata->vif.type != NL80211_IFTYPE_AP)
Johannes Berg84040802010-02-15 12:46:39 +02001943 break;
Johannes Berg8abd3f92009-02-10 21:25:47 +01001944
Jouni Malinen026331c2010-02-15 12:53:10 +02001945 /* verify action_code is present */
1946 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1947 break;
1948
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001949 switch (mgmt->u.action.u.addba_req.action_code) {
1950 case WLAN_ACTION_ADDBA_REQ:
1951 if (len < (IEEE80211_MIN_ACTION_SIZE +
1952 sizeof(mgmt->u.action.u.addba_req)))
Johannes Bergbed7ee62010-06-10 10:21:35 +02001953 goto invalid;
1954 break;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001955 case WLAN_ACTION_ADDBA_RESP:
1956 if (len < (IEEE80211_MIN_ACTION_SIZE +
1957 sizeof(mgmt->u.action.u.addba_resp)))
Johannes Bergbed7ee62010-06-10 10:21:35 +02001958 goto invalid;
1959 break;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001960 case WLAN_ACTION_DELBA:
1961 if (len < (IEEE80211_MIN_ACTION_SIZE +
1962 sizeof(mgmt->u.action.u.delba)))
Johannes Bergbed7ee62010-06-10 10:21:35 +02001963 goto invalid;
1964 break;
1965 default:
1966 goto invalid;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001967 }
Johannes Bergbed7ee62010-06-10 10:21:35 +02001968
Johannes Bergc1475ca2010-06-10 10:21:37 +02001969 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Bergbed7ee62010-06-10 10:21:35 +02001970 skb_queue_tail(&sdata->skb_queue, rx->skb);
1971 ieee80211_queue_work(&local->hw, &sdata->work);
1972 return RX_QUEUED;
Johannes Berg39192c02008-09-09 14:49:03 +02001973 case WLAN_CATEGORY_SPECTRUM_MGMT:
1974 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
Johannes Berg84040802010-02-15 12:46:39 +02001975 break;
Johannes Berg46900292009-02-15 12:44:28 +01001976
1977 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02001978 break;
Johannes Berg46900292009-02-15 12:44:28 +01001979
Jouni Malinen026331c2010-02-15 12:53:10 +02001980 /* verify action_code is present */
1981 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1982 break;
1983
Johannes Berg39192c02008-09-09 14:49:03 +02001984 switch (mgmt->u.action.u.measurement.action_code) {
1985 case WLAN_ACTION_SPCT_MSR_REQ:
1986 if (len < (IEEE80211_MIN_ACTION_SIZE +
1987 sizeof(mgmt->u.action.u.measurement)))
Johannes Berg84040802010-02-15 12:46:39 +02001988 break;
Johannes Berg39192c02008-09-09 14:49:03 +02001989 ieee80211_process_measurement_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02001990 goto handled;
Sujithc481ec92009-01-06 09:28:37 +05301991 case WLAN_ACTION_SPCT_CHL_SWITCH:
1992 if (len < (IEEE80211_MIN_ACTION_SIZE +
1993 sizeof(mgmt->u.action.u.chan_switch)))
Johannes Berg84040802010-02-15 12:46:39 +02001994 break;
Sujithc481ec92009-01-06 09:28:37 +05301995
Johannes Bergcc32abd2009-05-15 11:52:31 +02001996 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02001997 break;
Johannes Bergcc32abd2009-05-15 11:52:31 +02001998
Johannes Berg46900292009-02-15 12:44:28 +01001999 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
Johannes Berg84040802010-02-15 12:46:39 +02002000 break;
Sujithc481ec92009-01-06 09:28:37 +05302001
Johannes Bergc1475ca2010-06-10 10:21:37 +02002002 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg77a121c2010-06-10 10:21:34 +02002003 skb_queue_tail(&sdata->skb_queue, rx->skb);
2004 ieee80211_queue_work(&local->hw, &sdata->work);
2005 return RX_QUEUED;
Johannes Berg39192c02008-09-09 14:49:03 +02002006 }
2007 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002008 case WLAN_CATEGORY_SA_QUERY:
2009 if (len < (IEEE80211_MIN_ACTION_SIZE +
2010 sizeof(mgmt->u.action.u.sa_query)))
Johannes Berg84040802010-02-15 12:46:39 +02002011 break;
2012
Jouni Malinenfea14732009-01-08 13:32:06 +02002013 switch (mgmt->u.action.u.sa_query.action) {
2014 case WLAN_ACTION_SA_QUERY_REQUEST:
2015 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002016 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002017 ieee80211_process_sa_query_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002018 goto handled;
Jouni Malinenfea14732009-01-08 13:32:06 +02002019 }
2020 break;
Javier Cardona97ad9132010-03-29 11:00:21 -07002021 case WLAN_CATEGORY_MESH_PLINK:
2022 case WLAN_CATEGORY_MESH_PATH_SEL:
Johannes Berg77a121c2010-06-10 10:21:34 +02002023 if (!ieee80211_vif_is_mesh(&sdata->vif))
2024 break;
Johannes Bergc1475ca2010-06-10 10:21:37 +02002025 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg77a121c2010-06-10 10:21:34 +02002026 skb_queue_tail(&sdata->skb_queue, rx->skb);
2027 ieee80211_queue_work(&local->hw, &sdata->work);
2028 return RX_QUEUED;
Johannes Berg84040802010-02-15 12:46:39 +02002029 }
Jouni Malinen026331c2010-02-15 12:53:10 +02002030
Johannes Bergbed7ee62010-06-10 10:21:35 +02002031 invalid:
Johannes Berg84040802010-02-15 12:46:39 +02002032 /*
2033 * For AP mode, hostapd is responsible for handling any action
2034 * frames that we didn't handle, including returning unknown
2035 * ones. For all other modes we will return them to the sender,
2036 * setting the 0x80 bit in the action category, as required by
2037 * 802.11-2007 7.3.1.11.
2038 */
2039 if (sdata->vif.type == NL80211_IFTYPE_AP ||
2040 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2041 return RX_DROP_MONITOR;
Felix Fietkaud7907442010-01-07 20:23:53 +01002042
Jouni Malinen026331c2010-02-15 12:53:10 +02002043 /*
2044 * Getting here means the kernel doesn't know how to handle
2045 * it, but maybe userspace does ... include returned frames
2046 * so userspace can register for those to know whether ones
2047 * it transmitted were processed or returned.
2048 */
2049 status = IEEE80211_SKB_RXCB(rx->skb);
2050
Johannes Berg9d38d852010-06-09 17:20:33 +02002051 if (cfg80211_rx_action(rx->sdata->dev, status->freq,
Jouni Malinen026331c2010-02-15 12:53:10 +02002052 rx->skb->data, rx->skb->len,
2053 GFP_ATOMIC))
2054 goto handled;
2055
Johannes Berg84040802010-02-15 12:46:39 +02002056 /* do not return rejected action frames */
2057 if (mgmt->u.action.category & 0x80)
2058 return RX_DROP_UNUSABLE;
2059
2060 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2061 GFP_ATOMIC);
2062 if (nskb) {
2063 struct ieee80211_mgmt *mgmt = (void *)nskb->data;
2064
2065 mgmt->u.action.category |= 0x80;
2066 memcpy(mgmt->da, mgmt->sa, ETH_ALEN);
2067 memcpy(mgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2068
2069 memset(nskb->cb, 0, sizeof(nskb->cb));
2070
2071 ieee80211_tx_skb(rx->sdata, nskb);
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002072 }
2073
Johannes Berg84040802010-02-15 12:46:39 +02002074 handled:
Jouni Malinen026331c2010-02-15 12:53:10 +02002075 if (rx->sta)
2076 rx->sta->rx_packets++;
Johannes Berg39192c02008-09-09 14:49:03 +02002077 dev_kfree_skb(rx->skb);
2078 return RX_QUEUED;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002079}
2080
2081static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002082ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02002083{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002084 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergaf6b6372009-12-23 13:15:35 +01002085 ieee80211_rx_result rxs;
Johannes Berg77a121c2010-06-10 10:21:34 +02002086 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2087 __le16 stype;
Johannes Berg571ecf62007-07-27 15:43:22 +02002088
Johannes Berg5cf121c2008-02-25 16:27:43 +01002089 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002090 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02002091
Johannes Berg77a121c2010-06-10 10:21:34 +02002092 if (rx->skb->len < 24)
2093 return RX_DROP_MONITOR;
2094
Johannes Bergbef5d1c2010-02-16 11:05:00 +01002095 if (ieee80211_drop_unencrypted_mgmt(rx))
2096 return RX_DROP_UNUSABLE;
Jouni Malinen97ebe122009-01-08 13:32:08 +02002097
Johannes Bergaf6b6372009-12-23 13:15:35 +01002098 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2099 if (rxs != RX_CONTINUE)
2100 return rxs;
2101
Johannes Berg77a121c2010-06-10 10:21:34 +02002102 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
Johannes Berg472dbc42008-09-11 00:01:49 +02002103
Johannes Berg77a121c2010-06-10 10:21:34 +02002104 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2105 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2106 sdata->vif.type != NL80211_IFTYPE_STATION)
2107 return RX_DROP_MONITOR;
Johannes Bergf9d540e2007-09-28 14:02:09 +02002108
Johannes Berg77a121c2010-06-10 10:21:34 +02002109 switch (stype) {
2110 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2111 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2112 /* process for all: mesh, mlme, ibss */
2113 break;
2114 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2115 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2116 /* process only for station */
2117 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2118 return RX_DROP_MONITOR;
2119 break;
2120 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2121 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2122 /* process only for ibss */
2123 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2124 return RX_DROP_MONITOR;
2125 break;
2126 default:
2127 return RX_DROP_MONITOR;
2128 }
Johannes Berg46900292009-02-15 12:44:28 +01002129
Johannes Berg77a121c2010-06-10 10:21:34 +02002130 /* queue up frame and kick off work to process it */
Johannes Bergc1475ca2010-06-10 10:21:37 +02002131 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg77a121c2010-06-10 10:21:34 +02002132 skb_queue_tail(&sdata->skb_queue, rx->skb);
2133 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2134
2135 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002136}
2137
Johannes Berg3b8d81e2009-06-17 17:43:56 +02002138static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
Johannes Berg5cf121c2008-02-25 16:27:43 +01002139 struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02002140{
Harvey Harrisona7767f92008-07-02 16:30:51 -07002141 int keyidx;
2142 unsigned int hdrlen;
Johannes Berg571ecf62007-07-27 15:43:22 +02002143
Harvey Harrisona7767f92008-07-02 16:30:51 -07002144 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +02002145 if (rx->skb->len >= hdrlen + 4)
2146 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2147 else
2148 keyidx = -1;
2149
Johannes Berg8944b792008-01-31 19:48:26 +01002150 if (!rx->sta) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02002151 /*
2152 * Some hardware seem to generate incorrect Michael MIC
2153 * reports; ignore them to avoid triggering countermeasures.
2154 */
Johannes Bergaf2ced62009-11-16 12:00:39 +01002155 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002156 }
2157
Harvey Harrisona7767f92008-07-02 16:30:51 -07002158 if (!ieee80211_has_protected(hdr->frame_control))
Johannes Bergaf2ced62009-11-16 12:00:39 +01002159 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002160
Johannes Berg05c914f2008-09-11 00:01:58 +02002161 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02002162 /*
2163 * APs with pairwise keys should never receive Michael MIC
2164 * errors for non-zero keyidx because these are reserved for
2165 * group keys and only the AP is sending real multicast
2166 * frames in the BSS.
2167 */
Johannes Bergaf2ced62009-11-16 12:00:39 +01002168 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002169 }
2170
Harvey Harrisona7767f92008-07-02 16:30:51 -07002171 if (!ieee80211_is_data(hdr->frame_control) &&
2172 !ieee80211_is_auth(hdr->frame_control))
Johannes Bergaf2ced62009-11-16 12:00:39 +01002173 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002174
Johannes Berge6d6e342009-07-01 21:26:47 +02002175 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2176 GFP_ATOMIC);
Johannes Berg571ecf62007-07-27 15:43:22 +02002177}
2178
Johannes Berg5cf121c2008-02-25 16:27:43 +01002179/* TODO: use IEEE80211_RX_FRAGMENTED */
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002180static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2181 struct ieee80211_rate *rate)
Michael Wu3d30d942008-01-31 19:48:27 +01002182{
2183 struct ieee80211_sub_if_data *sdata;
2184 struct ieee80211_local *local = rx->local;
2185 struct ieee80211_rtap_hdr {
2186 struct ieee80211_radiotap_header hdr;
2187 u8 flags;
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002188 u8 rate_or_pad;
Michael Wu3d30d942008-01-31 19:48:27 +01002189 __le16 chan_freq;
2190 __le16 chan_flags;
2191 } __attribute__ ((packed)) *rthdr;
2192 struct sk_buff *skb = rx->skb, *skb2;
2193 struct net_device *prev_dev = NULL;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002194 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Michael Wu3d30d942008-01-31 19:48:27 +01002195
Johannes Berg8c0c7092009-11-25 17:46:15 +01002196 if (status->flag & RX_FLAG_INTERNAL_CMTR)
Michael Wu3d30d942008-01-31 19:48:27 +01002197 goto out_free_skb;
2198
2199 if (skb_headroom(skb) < sizeof(*rthdr) &&
2200 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2201 goto out_free_skb;
2202
2203 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2204 memset(rthdr, 0, sizeof(*rthdr));
2205 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2206 rthdr->hdr.it_present =
2207 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
Michael Wu3d30d942008-01-31 19:48:27 +01002208 (1 << IEEE80211_RADIOTAP_CHANNEL));
2209
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002210 if (rate) {
2211 rthdr->rate_or_pad = rate->bitrate / 5;
2212 rthdr->hdr.it_present |=
2213 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2214 }
Michael Wu3d30d942008-01-31 19:48:27 +01002215 rthdr->chan_freq = cpu_to_le16(status->freq);
2216
2217 if (status->band == IEEE80211_BAND_5GHZ)
2218 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2219 IEEE80211_CHAN_5GHZ);
2220 else
2221 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2222 IEEE80211_CHAN_2GHZ);
2223
2224 skb_set_mac_header(skb, 0);
2225 skb->ip_summed = CHECKSUM_UNNECESSARY;
2226 skb->pkt_type = PACKET_OTHERHOST;
2227 skb->protocol = htons(ETH_P_802_2);
2228
2229 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01002230 if (!ieee80211_sdata_running(sdata))
Michael Wu3d30d942008-01-31 19:48:27 +01002231 continue;
2232
Johannes Berg05c914f2008-09-11 00:01:58 +02002233 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Michael Wu3d30d942008-01-31 19:48:27 +01002234 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2235 continue;
2236
2237 if (prev_dev) {
2238 skb2 = skb_clone(skb, GFP_ATOMIC);
2239 if (skb2) {
2240 skb2->dev = prev_dev;
2241 netif_rx(skb2);
2242 }
2243 }
2244
2245 prev_dev = sdata->dev;
2246 sdata->dev->stats.rx_packets++;
2247 sdata->dev->stats.rx_bytes += skb->len;
2248 }
2249
2250 if (prev_dev) {
2251 skb->dev = prev_dev;
2252 netif_rx(skb);
2253 skb = NULL;
2254 } else
2255 goto out_free_skb;
2256
Johannes Berg8c0c7092009-11-25 17:46:15 +01002257 status->flag |= RX_FLAG_INTERNAL_CMTR;
Michael Wu3d30d942008-01-31 19:48:27 +01002258 return;
2259
2260 out_free_skb:
2261 dev_kfree_skb(skb);
2262}
2263
Johannes Berg571ecf62007-07-27 15:43:22 +02002264
Johannes Berg8944b792008-01-31 19:48:26 +01002265static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg5cf121c2008-02-25 16:27:43 +01002266 struct ieee80211_rx_data *rx,
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002267 struct sk_buff *skb,
2268 struct ieee80211_rate *rate)
Johannes Berg58905292008-01-31 19:48:25 +01002269{
Johannes Berg2569a822009-11-25 17:46:17 +01002270 struct sk_buff_head reorder_release;
Johannes Berg58905292008-01-31 19:48:25 +01002271 ieee80211_rx_result res = RX_DROP_MONITOR;
2272
Johannes Berg2569a822009-11-25 17:46:17 +01002273 __skb_queue_head_init(&reorder_release);
2274
Johannes Berg8944b792008-01-31 19:48:26 +01002275 rx->skb = skb;
2276 rx->sdata = sdata;
Johannes Berg8944b792008-01-31 19:48:26 +01002277
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002278#define CALL_RXH(rxh) \
2279 do { \
2280 res = rxh(rx); \
2281 if (res != RX_CONTINUE) \
Johannes Berg2569a822009-11-25 17:46:17 +01002282 goto rxh_next; \
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002283 } while (0);
Johannes Berg58905292008-01-31 19:48:25 +01002284
Johannes Berg2569a822009-11-25 17:46:17 +01002285 /*
2286 * NB: the rxh_next label works even if we jump
2287 * to it from here because then the list will
2288 * be empty, which is a trivial check
2289 */
Johannes Berg49461622008-06-30 15:10:45 +02002290 CALL_RXH(ieee80211_rx_h_passive_scan)
2291 CALL_RXH(ieee80211_rx_h_check)
Johannes Berg2569a822009-11-25 17:46:17 +01002292
2293 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2294
2295 while ((skb = __skb_dequeue(&reorder_release))) {
2296 /*
2297 * all the other fields are valid across frames
2298 * that belong to an aMPDU since they are on the
2299 * same TID from the same station
2300 */
2301 rx->skb = skb;
2302
2303 CALL_RXH(ieee80211_rx_h_decrypt)
2304 CALL_RXH(ieee80211_rx_h_check_more_data)
2305 CALL_RXH(ieee80211_rx_h_sta_process)
2306 CALL_RXH(ieee80211_rx_h_defragment)
2307 CALL_RXH(ieee80211_rx_h_ps_poll)
2308 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2309 /* must be after MMIC verify so header is counted in MPDU mic */
2310 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2311 CALL_RXH(ieee80211_rx_h_amsdu)
Ingo Molnarbf94e172008-10-12 23:51:38 -07002312#ifdef CONFIG_MAC80211_MESH
Johannes Berg2569a822009-11-25 17:46:17 +01002313 if (ieee80211_vif_is_mesh(&sdata->vif))
2314 CALL_RXH(ieee80211_rx_h_mesh_fwding);
Ingo Molnarbf94e172008-10-12 23:51:38 -07002315#endif
Johannes Berg2569a822009-11-25 17:46:17 +01002316 CALL_RXH(ieee80211_rx_h_data)
2317
2318 /* special treatment -- needs the queue */
2319 res = ieee80211_rx_h_ctrl(rx, &reorder_release);
2320 if (res != RX_CONTINUE)
2321 goto rxh_next;
2322
2323 CALL_RXH(ieee80211_rx_h_action)
2324 CALL_RXH(ieee80211_rx_h_mgmt)
Johannes Berg58905292008-01-31 19:48:25 +01002325
Johannes Berg49461622008-06-30 15:10:45 +02002326#undef CALL_RXH
2327
Johannes Berg2569a822009-11-25 17:46:17 +01002328 rxh_next:
2329 switch (res) {
2330 case RX_DROP_MONITOR:
2331 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2332 if (rx->sta)
2333 rx->sta->rx_dropped++;
2334 /* fall through */
2335 case RX_CONTINUE:
2336 ieee80211_rx_cooked_monitor(rx, rate);
2337 break;
2338 case RX_DROP_UNUSABLE:
2339 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2340 if (rx->sta)
2341 rx->sta->rx_dropped++;
2342 dev_kfree_skb(rx->skb);
2343 break;
2344 case RX_QUEUED:
2345 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2346 break;
2347 }
Johannes Berg58905292008-01-31 19:48:25 +01002348 }
2349}
2350
Johannes Berg571ecf62007-07-27 15:43:22 +02002351/* main receive path */
2352
Johannes Berg23a24de2007-07-27 15:43:22 +02002353static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg7ab17c42009-02-10 21:25:43 +01002354 struct ieee80211_rx_data *rx,
Johannes Berg23a24de2007-07-27 15:43:22 +02002355 struct ieee80211_hdr *hdr)
2356{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002357 struct sk_buff *skb = rx->skb;
2358 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2359 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02002360 int multicast = is_multicast_ether_addr(hdr->addr1);
2361
Johannes Berg51fb61e2007-12-19 01:31:27 +01002362 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02002363 case NL80211_IFTYPE_STATION:
Johannes Berg9bc383d2009-11-19 11:55:19 +01002364 if (!bssid && !sdata->u.mgd.use_4addr)
Johannes Berg23a24de2007-07-27 15:43:22 +02002365 return 0;
Johannes Berg77fdaa12009-07-07 03:45:17 +02002366 if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002367 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002368 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002369 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002370 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002371 }
2372 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002373 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02002374 if (!bssid)
2375 return 0;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002376 if (ieee80211_is_beacon(hdr->frame_control)) {
Bruno Randolf9d9bf772008-02-18 11:21:36 +09002377 return 1;
Vladimir Koutny87291c02008-06-13 16:50:44 +02002378 }
Johannes Berg46900292009-02-15 12:44:28 +01002379 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01002380 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002381 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002382 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002383 } else if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002384 compare_ether_addr(sdata->vif.addr,
Johannes Berg23a24de2007-07-27 15:43:22 +02002385 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002386 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002387 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002388 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002389 } else if (!rx->sta) {
2390 int rate_idx;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002391 if (status->flag & RX_FLAG_HT)
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002392 rate_idx = 0; /* TODO: HT rates */
2393 else
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002394 rate_idx = status->rate_idx;
Johannes Berg34e89502010-02-03 13:59:58 +01002395 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2396 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002397 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002398 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002399 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg6032f932008-02-23 15:17:07 +01002400 if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002401 compare_ether_addr(sdata->vif.addr,
Johannes Berg6032f932008-02-23 15:17:07 +01002402 hdr->addr1) != 0) {
2403 if (!(sdata->dev->flags & IFF_PROMISC))
2404 return 0;
2405
Johannes Berg5cf121c2008-02-25 16:27:43 +01002406 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg6032f932008-02-23 15:17:07 +01002407 }
2408 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002409 case NL80211_IFTYPE_AP_VLAN:
2410 case NL80211_IFTYPE_AP:
Johannes Berg23a24de2007-07-27 15:43:22 +02002411 if (!bssid) {
Johannes Berg47846c92009-11-25 17:46:19 +01002412 if (compare_ether_addr(sdata->vif.addr,
Johannes Berg23a24de2007-07-27 15:43:22 +02002413 hdr->addr1))
2414 return 0;
2415 } else if (!ieee80211_bssid_match(bssid,
Johannes Berg47846c92009-11-25 17:46:19 +01002416 sdata->vif.addr)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01002417 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002418 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002419 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002420 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002421 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002422 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07002423 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02002424 return 0;
2425 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2426 return 0;
2427 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002428 case NL80211_IFTYPE_MONITOR:
Johannes Berg05c914f2008-09-11 00:01:58 +02002429 case NL80211_IFTYPE_UNSPECIFIED:
2430 case __NL80211_IFTYPE_AFTER_LAST:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02002431 /* should never get here */
2432 WARN_ON(1);
2433 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02002434 }
2435
2436 return 1;
2437}
2438
Johannes Berg571ecf62007-07-27 15:43:22 +02002439/*
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002440 * This is the actual Rx frames handler. as it blongs to Rx path it must
2441 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02002442 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002443static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2444 struct sk_buff *skb,
Johannes Berg8318d782008-01-24 19:38:38 +01002445 struct ieee80211_rate *rate)
Johannes Berg571ecf62007-07-27 15:43:22 +02002446{
Johannes Bergf1d58c22009-06-17 13:13:00 +02002447 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002448 struct ieee80211_local *local = hw_to_local(hw);
2449 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002450 struct ieee80211_hdr *hdr;
Zhu Yie3cf8b32010-03-29 17:35:07 +08002451 __le16 fc;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002452 struct ieee80211_rx_data rx;
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002453 int prepares;
Johannes Berg8e6f0032007-07-27 15:43:22 +02002454 struct ieee80211_sub_if_data *prev = NULL;
2455 struct sk_buff *skb_new;
Johannes Bergabe60632009-11-25 17:46:18 +01002456 struct sta_info *sta, *tmp;
2457 bool found_sta = false;
Zhu Yie3cf8b32010-03-29 17:35:07 +08002458 int err = 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02002459
Zhu Yie3cf8b32010-03-29 17:35:07 +08002460 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02002461 memset(&rx, 0, sizeof(rx));
2462 rx.skb = skb;
2463 rx.local = local;
Johannes Berg72abd812007-09-17 01:29:22 -04002464
Zhu Yie3cf8b32010-03-29 17:35:07 +08002465 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
Johannes Berg571ecf62007-07-27 15:43:22 +02002466 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02002467
Helmut Schaa142b9f52009-07-23 13:18:01 +02002468 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2469 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
Johannes Berg5cf121c2008-02-25 16:27:43 +01002470 rx.flags |= IEEE80211_RX_IN_SCAN;
Johannes Berg571ecf62007-07-27 15:43:22 +02002471
Zhu Yie3cf8b32010-03-29 17:35:07 +08002472 if (ieee80211_is_mgmt(fc))
2473 err = skb_linearize(skb);
2474 else
2475 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2476
2477 if (err) {
2478 dev_kfree_skb(skb);
2479 return;
2480 }
2481
2482 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg38f37142008-01-29 17:07:43 +01002483 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01002484 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01002485
Zhu Yie3cf8b32010-03-29 17:35:07 +08002486 if (ieee80211_is_data(fc)) {
Johannes Bergabe60632009-11-25 17:46:18 +01002487 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2488 rx.sta = sta;
2489 found_sta = true;
2490 rx.sdata = sta->sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002491
Johannes Bergabe60632009-11-25 17:46:18 +01002492 rx.flags |= IEEE80211_RX_RA_MATCH;
2493 prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
2494 if (prepares) {
2495 if (status->flag & RX_FLAG_MMIC_ERROR) {
2496 if (rx.flags & IEEE80211_RX_RA_MATCH)
2497 ieee80211_rx_michael_mic_report(hdr, &rx);
2498 } else
2499 prev = rx.sdata;
2500 }
2501 }
2502 }
2503 if (!found_sta) {
2504 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01002505 if (!ieee80211_sdata_running(sdata))
Johannes Bergabe60632009-11-25 17:46:18 +01002506 continue;
2507
2508 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2509 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2510 continue;
2511
Johannes Bergabe60632009-11-25 17:46:18 +01002512 /*
2513 * frame is destined for this interface, but if it's
2514 * not also for the previous one we handle that after
2515 * the loop to avoid copying the SKB once too much
2516 */
Johannes Bergb2e77712007-09-26 15:19:39 +02002517
Johannes Bergabe60632009-11-25 17:46:18 +01002518 if (!prev) {
2519 prev = sdata;
2520 continue;
2521 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002522
Felix Fietkau4754ffd2010-01-31 21:50:12 +01002523 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002524
2525 rx.flags |= IEEE80211_RX_RA_MATCH;
2526 prepares = prepare_for_handlers(prev, &rx, hdr);
2527
2528 if (!prepares)
2529 goto next;
2530
2531 if (status->flag & RX_FLAG_MMIC_ERROR) {
2532 rx.sdata = prev;
2533 if (rx.flags & IEEE80211_RX_RA_MATCH)
2534 ieee80211_rx_michael_mic_report(hdr,
2535 &rx);
2536 goto next;
2537 }
2538
Johannes Bergabe60632009-11-25 17:46:18 +01002539 /*
2540 * frame was destined for the previous interface
2541 * so invoke RX handlers for it
2542 */
Johannes Berg8e6f0032007-07-27 15:43:22 +02002543
Johannes Bergabe60632009-11-25 17:46:18 +01002544 skb_new = skb_copy(skb, GFP_ATOMIC);
2545 if (!skb_new) {
2546 if (net_ratelimit())
2547 printk(KERN_DEBUG "%s: failed to copy "
2548 "multicast frame for %s\n",
2549 wiphy_name(local->hw.wiphy),
Johannes Berg47846c92009-11-25 17:46:19 +01002550 prev->name);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002551 goto next;
Johannes Bergabe60632009-11-25 17:46:18 +01002552 }
2553 ieee80211_invoke_rx_handlers(prev, &rx, skb_new, rate);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002554next:
Johannes Berg340e11f2007-07-27 15:43:22 +02002555 prev = sdata;
Johannes Berg8e6f0032007-07-27 15:43:22 +02002556 }
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002557
2558 if (prev) {
Felix Fietkau4754ffd2010-01-31 21:50:12 +01002559 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002560
2561 rx.flags |= IEEE80211_RX_RA_MATCH;
2562 prepares = prepare_for_handlers(prev, &rx, hdr);
2563
2564 if (!prepares)
2565 prev = NULL;
2566 }
Johannes Berg571ecf62007-07-27 15:43:22 +02002567 }
Harvey Harrisona4b7d7b2008-07-15 18:44:14 -07002568 if (prev)
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002569 ieee80211_invoke_rx_handlers(prev, &rx, skb, rate);
Harvey Harrisona4b7d7b2008-07-15 18:44:14 -07002570 else
Johannes Berg8e6f0032007-07-27 15:43:22 +02002571 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002572}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002573
2574/*
2575 * This is the receive path handler. It is called by a low level driver when an
2576 * 802.11 MPDU is received from the hardware.
2577 */
John W. Linville103bf9f2009-08-20 16:34:15 -04002578void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002579{
2580 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01002581 struct ieee80211_rate *rate = NULL;
2582 struct ieee80211_supported_band *sband;
Johannes Bergf1d58c22009-06-17 13:13:00 +02002583 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg8318d782008-01-24 19:38:38 +01002584
Johannes Bergd20ef632009-10-11 15:10:40 +02002585 WARN_ON_ONCE(softirq_count() == 0);
2586
Johannes Berg77a980d2009-08-24 11:46:30 +02002587 if (WARN_ON(status->band < 0 ||
2588 status->band >= IEEE80211_NUM_BANDS))
2589 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01002590
2591 sband = local->hw.wiphy->bands[status->band];
Johannes Berg77a980d2009-08-24 11:46:30 +02002592 if (WARN_ON(!sband))
2593 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01002594
Johannes Berg89c3a8a2009-07-28 18:10:17 +02002595 /*
2596 * If we're suspending, it is possible although not too likely
2597 * that we'd be receiving frames after having already partially
2598 * quiesced the stack. We can't process such frames then since
2599 * that might, for example, cause stations to be added or other
2600 * driver callbacks be invoked.
2601 */
Johannes Berg77a980d2009-08-24 11:46:30 +02002602 if (unlikely(local->quiescing || local->suspended))
2603 goto drop;
Johannes Berg89c3a8a2009-07-28 18:10:17 +02002604
Johannes Bergea77f122009-08-21 14:44:45 +02002605 /*
2606 * The same happens when we're not even started,
2607 * but that's worth a warning.
2608 */
Johannes Berg77a980d2009-08-24 11:46:30 +02002609 if (WARN_ON(!local->started))
2610 goto drop;
Johannes Bergea77f122009-08-21 14:44:45 +02002611
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002612 if (status->flag & RX_FLAG_HT) {
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05002613 /*
2614 * rate_idx is MCS index, which can be [0-76] as documented on:
2615 *
2616 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2617 *
2618 * Anything else would be some sort of driver or hardware error.
2619 * The driver should catch hardware errors.
2620 */
2621 if (WARN((status->rate_idx < 0 ||
2622 status->rate_idx > 76),
2623 "Rate marked as an HT rate but passed "
2624 "status->rate_idx is not "
2625 "an MCS index [0-76]: %d (0x%02x)\n",
2626 status->rate_idx,
2627 status->rate_idx))
Johannes Berg77a980d2009-08-24 11:46:30 +02002628 goto drop;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002629 } else {
2630 if (WARN_ON(status->rate_idx < 0 ||
2631 status->rate_idx >= sband->n_bitrates))
Johannes Berg77a980d2009-08-24 11:46:30 +02002632 goto drop;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002633 rate = &sband->bitrates[status->rate_idx];
2634 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002635
2636 /*
2637 * key references and virtual interfaces are protected using RCU
2638 * and this requires that we are in a read-side RCU section during
2639 * receive processing
2640 */
2641 rcu_read_lock();
2642
2643 /*
2644 * Frames with failed FCS/PLCP checksum are not returned,
2645 * all other frames are returned without radiotap header
2646 * if it was previously present.
2647 * Also, frames with less than 16 bytes are dropped.
2648 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002649 skb = ieee80211_rx_monitor(local, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002650 if (!skb) {
2651 rcu_read_unlock();
2652 return;
2653 }
2654
Johannes Berg2569a822009-11-25 17:46:17 +01002655 __ieee80211_rx_handle_packet(hw, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002656
2657 rcu_read_unlock();
Johannes Berg77a980d2009-08-24 11:46:30 +02002658
2659 return;
2660 drop:
2661 kfree_skb(skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002662}
John W. Linville103bf9f2009-08-20 16:34:15 -04002663EXPORT_SYMBOL(ieee80211_rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02002664
2665/* This is a version of the rx handler that can be called from hard irq
2666 * context. Post the skb on the queue and schedule the tasklet */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002667void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02002668{
2669 struct ieee80211_local *local = hw_to_local(hw);
2670
2671 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2672
Johannes Berg571ecf62007-07-27 15:43:22 +02002673 skb->pkt_type = IEEE80211_RX_MSG;
2674 skb_queue_tail(&local->skb_queue, skb);
2675 tasklet_schedule(&local->tasklet);
2676}
2677EXPORT_SYMBOL(ieee80211_rx_irqsafe);