blob: bfcf09eb64b4a8343ee0326c0227f5af940a203a [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>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
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>
Johannes Berg571ecf62007-07-27 15:43:22 +020013#include <linux/kernel.h>
14#include <linux/skbuff.h>
15#include <linux/netdevice.h>
16#include <linux/etherdevice.h>
Johannes Bergd4e46a32007-09-14 11:10:24 -040017#include <linux/rcupdate.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020018#include <net/mac80211.h>
19#include <net/ieee80211_radiotap.h>
20
21#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020022#include "driver-ops.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040023#include "led.h"
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +010024#include "mesh.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020025#include "wep.h"
26#include "wpa.h"
27#include "tkip.h"
28#include "wme.h"
29
Johannes Bergb2e77712007-09-26 15:19:39 +020030/*
31 * monitor mode reception
32 *
33 * This function cleans up the SKB, i.e. it removes all the stuff
34 * only useful for monitoring.
35 */
36static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
Johannes Berg0869aea2009-10-28 10:03:35 +010037 struct sk_buff *skb)
Johannes Bergb2e77712007-09-26 15:19:39 +020038{
Johannes Bergb2e77712007-09-26 15:19:39 +020039 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
40 if (likely(skb->len > FCS_LEN))
41 skb_trim(skb, skb->len - FCS_LEN);
42 else {
43 /* driver bug */
44 WARN_ON(1);
45 dev_kfree_skb(skb);
46 skb = NULL;
47 }
48 }
49
50 return skb;
51}
52
Johannes Bergf1d58c22009-06-17 13:13:00 +020053static inline int should_drop_frame(struct sk_buff *skb,
Johannes Berg0869aea2009-10-28 10:03:35 +010054 int present_fcs_len)
Johannes Bergb2e77712007-09-26 15:19:39 +020055{
Johannes Bergf1d58c22009-06-17 13:13:00 +020056 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Harvey Harrison182503a2008-06-22 16:45:29 -070057 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Bergb2e77712007-09-26 15:19:39 +020058
59 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
60 return 1;
Johannes Berg0869aea2009-10-28 10:03:35 +010061 if (unlikely(skb->len < 16 + present_fcs_len))
Johannes Bergb2e77712007-09-26 15:19:39 +020062 return 1;
Harvey Harrison87228f52008-06-11 14:21:59 -070063 if (ieee80211_is_ctl(hdr->frame_control) &&
64 !ieee80211_is_pspoll(hdr->frame_control) &&
65 !ieee80211_is_back_req(hdr->frame_control))
Johannes Bergb2e77712007-09-26 15:19:39 +020066 return 1;
67 return 0;
68}
69
Bruno Randolf601ae7f2008-05-08 19:22:43 +020070static int
71ieee80211_rx_radiotap_len(struct ieee80211_local *local,
72 struct ieee80211_rx_status *status)
73{
74 int len;
75
76 /* always present fields */
77 len = sizeof(struct ieee80211_radiotap_header) + 9;
78
79 if (status->flag & RX_FLAG_TSFT)
80 len += 8;
Johannes Berg7fee5372009-01-30 11:13:06 +010081 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
Bruno Randolf601ae7f2008-05-08 19:22:43 +020082 len += 1;
83 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
84 len += 1;
85
86 if (len & 1) /* padding for RX_FLAGS if necessary */
87 len++;
88
Bruno Randolf601ae7f2008-05-08 19:22:43 +020089 return len;
90}
91
Johannes Bergd1c3a372009-01-07 00:26:10 +010092/*
Bruno Randolf601ae7f2008-05-08 19:22:43 +020093 * ieee80211_add_rx_radiotap_header - add radiotap header
94 *
95 * add a radiotap header containing all the fields which the hardware provided.
96 */
97static void
98ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
99 struct sk_buff *skb,
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200100 struct ieee80211_rate *rate,
101 int rtap_len)
102{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200103 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200104 struct ieee80211_radiotap_header *rthdr;
105 unsigned char *pos;
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100106 u16 rx_flags = 0;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200107
108 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
109 memset(rthdr, 0, rtap_len);
110
111 /* radiotap header, set always present flags */
112 rthdr->it_present =
113 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200114 (1 << IEEE80211_RADIOTAP_CHANNEL) |
115 (1 << IEEE80211_RADIOTAP_ANTENNA) |
116 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
117 rthdr->it_len = cpu_to_le16(rtap_len);
118
119 pos = (unsigned char *)(rthdr+1);
120
121 /* the order of the following fields is important */
122
123 /* IEEE80211_RADIOTAP_TSFT */
124 if (status->flag & RX_FLAG_TSFT) {
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100125 put_unaligned_le64(status->mactime, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200126 rthdr->it_present |=
127 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
128 pos += 8;
129 }
130
131 /* IEEE80211_RADIOTAP_FLAGS */
132 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
133 *pos |= IEEE80211_RADIOTAP_F_FCS;
Johannes Bergaae89832009-03-13 12:52:10 +0100134 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
135 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
Bruno Randolfb4f28bb2008-07-30 17:19:55 +0200136 if (status->flag & RX_FLAG_SHORTPRE)
137 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200138 pos++;
139
140 /* IEEE80211_RADIOTAP_RATE */
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200141 if (status->flag & RX_FLAG_HT) {
142 /*
143 * TODO: add following information into radiotap header once
144 * suitable fields are defined for it:
145 * - MCS index (status->rate_idx)
146 * - HT40 (status->flag & RX_FLAG_40MHZ)
147 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
148 */
149 *pos = 0;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200150 } else {
Jouni Malinenebe6c7b2009-01-10 11:47:33 +0200151 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200152 *pos = rate->bitrate / 5;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200153 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200154 pos++;
155
156 /* IEEE80211_RADIOTAP_CHANNEL */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100157 put_unaligned_le16(status->freq, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200158 pos += 2;
159 if (status->band == IEEE80211_BAND_5GHZ)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100160 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
161 pos);
Johannes Berg5f0b7de2009-11-16 13:58:21 +0100162 else if (status->flag & RX_FLAG_HT)
163 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
164 pos);
Bruno Randolf9deb1ae2008-07-30 17:20:06 +0200165 else if (rate->flags & IEEE80211_RATE_ERP_G)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100166 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
167 pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200168 else
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100169 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
170 pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200171 pos += 2;
172
173 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
174 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
175 *pos = status->signal;
176 rthdr->it_present |=
177 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
178 pos++;
179 }
180
181 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
182 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
183 *pos = status->noise;
184 rthdr->it_present |=
185 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
186 pos++;
187 }
188
189 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
190
191 /* IEEE80211_RADIOTAP_ANTENNA */
192 *pos = status->antenna;
193 pos++;
194
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200195 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
196
197 /* IEEE80211_RADIOTAP_RX_FLAGS */
198 /* ensure 2 byte alignment for the 2 byte field as required */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100199 if ((pos - (u8 *)rthdr) & 1)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200200 pos++;
Johannes Bergaae89832009-03-13 12:52:10 +0100201 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100202 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
203 put_unaligned_le16(rx_flags, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200204 pos += 2;
205}
206
Johannes Bergb2e77712007-09-26 15:19:39 +0200207/*
208 * This function copies a received frame to all monitor interfaces and
209 * returns a cleaned-up SKB that no longer includes the FCS nor the
210 * radiotap header the driver might have added.
211 */
212static struct sk_buff *
213ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
Johannes Berg8318d782008-01-24 19:38:38 +0100214 struct ieee80211_rate *rate)
Johannes Bergb2e77712007-09-26 15:19:39 +0200215{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200216 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200217 struct ieee80211_sub_if_data *sdata;
Johannes Bergb2e77712007-09-26 15:19:39 +0200218 int needed_headroom = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200219 struct sk_buff *skb, *skb2;
220 struct net_device *prev_dev = NULL;
221 int present_fcs_len = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200222
223 /*
224 * First, we may need to make a copy of the skb because
225 * (1) we need to modify it for radiotap (if not present), and
226 * (2) the other RX handlers will modify the skb we got.
227 *
228 * We don't need to, of course, if we aren't going to return
229 * the SKB because it has a bad FCS/PLCP checksum.
230 */
Johannes Berg0869aea2009-10-28 10:03:35 +0100231
232 /* room for the radiotap header based on driver features */
233 needed_headroom = ieee80211_rx_radiotap_len(local, status);
Johannes Bergb2e77712007-09-26 15:19:39 +0200234
235 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
236 present_fcs_len = FCS_LEN;
237
238 if (!local->monitors) {
Johannes Berg0869aea2009-10-28 10:03:35 +0100239 if (should_drop_frame(origskb, present_fcs_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200240 dev_kfree_skb(origskb);
241 return NULL;
242 }
243
Johannes Berg0869aea2009-10-28 10:03:35 +0100244 return remove_monitor_info(local, origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200245 }
246
Johannes Berg0869aea2009-10-28 10:03:35 +0100247 if (should_drop_frame(origskb, present_fcs_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200248 /* only need to expand headroom if necessary */
249 skb = origskb;
250 origskb = NULL;
251
252 /*
253 * This shouldn't trigger often because most devices have an
254 * RX header they pull before we get here, and that should
255 * be big enough for our radiotap information. We should
256 * probably export the length to drivers so that we can have
257 * them allocate enough headroom to start with.
258 */
259 if (skb_headroom(skb) < needed_headroom &&
Johannes Bergc49e5ea2007-12-11 21:33:42 +0100260 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200261 dev_kfree_skb(skb);
262 return NULL;
263 }
264 } else {
265 /*
266 * Need to make a copy and possibly remove radiotap header
267 * and FCS from the original.
268 */
269 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
270
Johannes Berg0869aea2009-10-28 10:03:35 +0100271 origskb = remove_monitor_info(local, origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200272
273 if (!skb)
274 return origskb;
275 }
276
Johannes Berg0869aea2009-10-28 10:03:35 +0100277 /* prepend radiotap information */
278 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
Johannes Bergb2e77712007-09-26 15:19:39 +0200279
Johannes Bergce3edf6d02007-12-19 01:31:22 +0100280 skb_reset_mac_header(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200281 skb->ip_summed = CHECKSUM_UNNECESSARY;
282 skb->pkt_type = PACKET_OTHERHOST;
283 skb->protocol = htons(ETH_P_802_2);
284
285 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200286 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +0200287 continue;
288
Michael Wu3d30d942008-01-31 19:48:27 +0100289 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
290 continue;
291
Johannes Berg9607e6b2009-12-23 13:15:31 +0100292 if (!ieee80211_sdata_running(sdata))
Johannes Berg47846c92009-11-25 17:46:19 +0100293 continue;
294
Johannes Bergb2e77712007-09-26 15:19:39 +0200295 if (prev_dev) {
296 skb2 = skb_clone(skb, GFP_ATOMIC);
297 if (skb2) {
298 skb2->dev = prev_dev;
299 netif_rx(skb2);
300 }
301 }
302
303 prev_dev = sdata->dev;
304 sdata->dev->stats.rx_packets++;
305 sdata->dev->stats.rx_bytes += skb->len;
306 }
307
308 if (prev_dev) {
309 skb->dev = prev_dev;
310 netif_rx(skb);
311 } else
312 dev_kfree_skb(skb);
313
314 return origskb;
315}
316
317
Johannes Berg5cf121c2008-02-25 16:27:43 +0100318static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200319{
Harvey Harrison238f74a2008-07-02 11:05:34 -0700320 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200321 int tid;
322
323 /* does the frame have a qos control field? */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700324 if (ieee80211_is_data_qos(hdr->frame_control)) {
325 u8 *qc = ieee80211_get_qos_ctl(hdr);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200326 /* frame has qos control */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700327 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
328 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
Johannes Berg5cf121c2008-02-25 16:27:43 +0100329 rx->flags |= IEEE80211_RX_AMSDU;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +0200330 else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100331 rx->flags &= ~IEEE80211_RX_AMSDU;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200332 } else {
Johannes Berg1411f9b2008-07-10 10:11:02 +0200333 /*
334 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
335 *
336 * Sequence numbers for management frames, QoS data
337 * frames with a broadcast/multicast address in the
338 * Address 1 field, and all non-QoS data frames sent
339 * by QoS STAs are assigned using an additional single
340 * modulo-4096 counter, [...]
341 *
342 * We also use that counter for non-QoS STAs.
343 */
344 tid = NUM_RX_DATA_QUEUES - 1;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200345 }
Johannes Berg52865dfd2007-07-27 15:43:22 +0200346
Johannes Berg5cf121c2008-02-25 16:27:43 +0100347 rx->queue = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200348 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
349 * For now, set skb->priority to 0 for other cases. */
350 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100351}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200352
Johannes Bergd1c3a372009-01-07 00:26:10 +0100353/**
354 * DOC: Packet alignment
355 *
356 * Drivers always need to pass packets that are aligned to two-byte boundaries
357 * to the stack.
358 *
359 * Additionally, should, if possible, align the payload data in a way that
360 * guarantees that the contained IP header is aligned to a four-byte
361 * boundary. In the case of regular frames, this simply means aligning the
362 * payload to a four-byte boundary (because either the IP header is directly
363 * contained, or IV/RFC1042 headers that have a length divisible by four are
Kalle Valo59d9cb02009-12-17 13:54:57 +0100364 * in front of it). If the payload data is not properly aligned and the
365 * architecture doesn't support efficient unaligned operations, mac80211
366 * will align the data.
Johannes Bergd1c3a372009-01-07 00:26:10 +0100367 *
368 * With A-MSDU frames, however, the payload data address must yield two modulo
369 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
370 * push the IP header further back to a multiple of four again. Thankfully, the
371 * specs were sane enough this time around to require padding each A-MSDU
372 * subframe to a length that is a multiple of four.
373 *
374 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
375 * the payload is not supported, the driver is required to move the 802.11
376 * header to be directly in front of the payload in that case.
377 */
378static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
Johannes Berg38f37142008-01-29 17:07:43 +0100379{
Kalle Valo59d9cb02009-12-17 13:54:57 +0100380#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
381 WARN_ONCE((unsigned long)rx->skb->data & 1,
382 "unaligned packet at 0x%p\n", rx->skb->data);
Johannes Bergd1c3a372009-01-07 00:26:10 +0100383#endif
Johannes Berg6e0d1142007-07-27 15:43:22 +0200384}
385
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +0200386
Johannes Berg571ecf62007-07-27 15:43:22 +0200387/* rx handlers */
388
Johannes Berg49461622008-06-30 15:10:45 +0200389static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100390ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200391{
392 struct ieee80211_local *local = rx->local;
393 struct sk_buff *skb = rx->skb;
394
Helmut Schaafbe9c422009-07-23 12:14:04 +0200395 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning)))
Johannes Bergf1d58c22009-06-17 13:13:00 +0200396 return ieee80211_scan_rx(rx->sdata, skb);
Zhu Yiece8edd2007-11-22 10:53:21 +0800397
Helmut Schaa142b9f52009-07-23 13:18:01 +0200398 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) &&
399 (rx->flags & IEEE80211_RX_IN_SCAN))) {
Zhu Yiece8edd2007-11-22 10:53:21 +0800400 /* drop all the other packets during a software scan anyway */
Johannes Bergf1d58c22009-06-17 13:13:00 +0200401 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
Zhu Yiece8edd2007-11-22 10:53:21 +0800402 dev_kfree_skb(skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100403 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200404 }
405
Johannes Berg5cf121c2008-02-25 16:27:43 +0100406 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200407 /* scanning finished during invoking of handlers */
408 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100409 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200410 }
411
Johannes Berg9ae54c82008-01-31 19:48:20 +0100412 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200413}
414
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200415
416static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
417{
418 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
419
420 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
421 return 0;
422
423 return ieee80211_is_robust_mgmt_frame(hdr);
424}
425
426
427static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
428{
429 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
430
431 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
432 return 0;
433
434 return ieee80211_is_robust_mgmt_frame(hdr);
435}
436
437
438/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
439static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
440{
441 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
442 struct ieee80211_mmie *mmie;
443
444 if (skb->len < 24 + sizeof(*mmie) ||
445 !is_multicast_ether_addr(hdr->da))
446 return -1;
447
448 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
449 return -1; /* not a robust management frame */
450
451 mmie = (struct ieee80211_mmie *)
452 (skb->data + skb->len - sizeof(*mmie));
453 if (mmie->element_id != WLAN_EID_MMIE ||
454 mmie->length != sizeof(*mmie) - 2)
455 return -1;
456
457 return le16_to_cpu(mmie->key_id);
458}
459
460
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100461static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100462ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100463{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700464 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
465 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg47846c92009-11-25 17:46:19 +0100466 char *dev_addr = rx->sdata->vif.addr;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100467
Harvey Harrisona7767f92008-07-02 16:30:51 -0700468 if (ieee80211_is_data(hdr->frame_control)) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700469 if (is_multicast_ether_addr(hdr->addr1)) {
470 if (ieee80211_has_tods(hdr->frame_control) ||
471 !ieee80211_has_fromds(hdr->frame_control))
472 return RX_DROP_MONITOR;
473 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
474 return RX_DROP_MONITOR;
475 } else {
476 if (!ieee80211_has_a4(hdr->frame_control))
477 return RX_DROP_MONITOR;
478 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
479 return RX_DROP_MONITOR;
480 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100481 }
482
483 /* If there is not an established peer link and this is not a peer link
484 * establisment frame, beacon or probe, drop the frame.
485 */
486
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800487 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100488 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100489
Harvey Harrisona7767f92008-07-02 16:30:51 -0700490 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100491 return RX_DROP_MONITOR;
492
Harvey Harrisona7767f92008-07-02 16:30:51 -0700493 if (ieee80211_is_action(hdr->frame_control)) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100494 mgmt = (struct ieee80211_mgmt *)hdr;
Rui Paulo09383932009-11-09 23:46:43 +0000495 if (mgmt->u.action.category != MESH_PLINK_CATEGORY)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100496 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100497 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100498 }
499
Harvey Harrisona7767f92008-07-02 16:30:51 -0700500 if (ieee80211_is_probe_req(hdr->frame_control) ||
501 ieee80211_is_probe_resp(hdr->frame_control) ||
502 ieee80211_is_beacon(hdr->frame_control))
503 return RX_CONTINUE;
504
505 return RX_DROP_MONITOR;
506
507 }
508
509#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
510
511 if (ieee80211_is_data(hdr->frame_control) &&
512 is_multicast_ether_addr(hdr->addr1) &&
Javier Cardona3c5772a2009-08-10 12:15:48 -0700513 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100514 return RX_DROP_MONITOR;
Johannes Berg902acc72008-02-23 15:17:19 +0100515#undef msh_h_get
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100516
Johannes Berg902acc72008-02-23 15:17:19 +0100517 return RX_CONTINUE;
518}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100519
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100520#define SEQ_MODULO 0x1000
521#define SEQ_MASK 0xfff
522
523static inline int seq_less(u16 sq1, u16 sq2)
524{
525 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
526}
527
528static inline u16 seq_inc(u16 sq)
529{
530 return (sq + 1) & SEQ_MASK;
531}
532
533static inline u16 seq_sub(u16 sq1, u16 sq2)
534{
535 return (sq1 - sq2) & SEQ_MASK;
536}
537
538
539static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
540 struct tid_ampdu_rx *tid_agg_rx,
Johannes Berg2569a822009-11-25 17:46:17 +0100541 int index,
542 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100543{
544 struct ieee80211_supported_band *sband;
545 struct ieee80211_rate *rate = NULL;
546 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
547 struct ieee80211_rx_status *status;
548
549 if (!skb)
550 goto no_frame;
551
552 status = IEEE80211_SKB_RXCB(skb);
553
554 /* release the reordered frames to stack */
555 sband = hw->wiphy->bands[status->band];
556 if (!(status->flag & RX_FLAG_HT))
557 rate = &sband->bitrates[status->rate_idx];
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100558 tid_agg_rx->stored_mpdu_num--;
559 tid_agg_rx->reorder_buf[index] = NULL;
Johannes Bergd29cecd2009-12-04 14:25:43 -0800560 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100561
562no_frame:
563 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
564}
565
566static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
567 struct tid_ampdu_rx *tid_agg_rx,
Johannes Berg2569a822009-11-25 17:46:17 +0100568 u16 head_seq_num,
569 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100570{
571 int index;
572
573 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
574 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
575 tid_agg_rx->buf_size;
Johannes Berg2569a822009-11-25 17:46:17 +0100576 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100577 }
578}
579
580/*
581 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
582 * the skb was added to the buffer longer than this time ago, the earlier
583 * frames that have not yet been received are assumed to be lost and the skb
584 * can be released for processing. This may also release other skb's from the
585 * reorder buffer if there are no additional gaps between the frames.
586 */
587#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
588
589/*
590 * As this function belongs to the RX path it must be under
591 * rcu_read_lock protection. It returns false if the frame
592 * can be processed immediately, true if it was consumed.
593 */
594static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
595 struct tid_ampdu_rx *tid_agg_rx,
Johannes Berg2569a822009-11-25 17:46:17 +0100596 struct sk_buff *skb,
597 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100598{
599 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
600 u16 sc = le16_to_cpu(hdr->seq_ctrl);
601 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
602 u16 head_seq_num, buf_size;
603 int index;
604
605 buf_size = tid_agg_rx->buf_size;
606 head_seq_num = tid_agg_rx->head_seq_num;
607
608 /* frame with out of date sequence number */
609 if (seq_less(mpdu_seq_num, head_seq_num)) {
610 dev_kfree_skb(skb);
611 return true;
612 }
613
614 /*
615 * If frame the sequence number exceeds our buffering window
616 * size release some previous frames to make room for this one.
617 */
618 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
619 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
620 /* release stored frames up to new head to stack */
Johannes Berg2569a822009-11-25 17:46:17 +0100621 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
622 frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100623 }
624
625 /* Now the new frame is always in the range of the reordering buffer */
626
627 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
628
629 /* check if we already stored this frame */
630 if (tid_agg_rx->reorder_buf[index]) {
631 dev_kfree_skb(skb);
632 return true;
633 }
634
635 /*
636 * If the current MPDU is in the right order and nothing else
637 * is stored we can process it directly, no need to buffer it.
638 */
639 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
640 tid_agg_rx->stored_mpdu_num == 0) {
641 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
642 return false;
643 }
644
645 /* put the frame in the reordering buffer */
646 tid_agg_rx->reorder_buf[index] = skb;
647 tid_agg_rx->reorder_time[index] = jiffies;
648 tid_agg_rx->stored_mpdu_num++;
649 /* release the buffer until next missing frame */
650 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
651 tid_agg_rx->buf_size;
652 if (!tid_agg_rx->reorder_buf[index] &&
653 tid_agg_rx->stored_mpdu_num > 1) {
654 /*
655 * No buffers ready to be released, but check whether any
656 * frames in the reorder buffer have timed out.
657 */
658 int j;
659 int skipped = 1;
660 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
661 j = (j + 1) % tid_agg_rx->buf_size) {
662 if (!tid_agg_rx->reorder_buf[j]) {
663 skipped++;
664 continue;
665 }
666 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
667 HT_RX_REORDER_BUF_TIMEOUT))
668 break;
669
670#ifdef CONFIG_MAC80211_HT_DEBUG
671 if (net_ratelimit())
672 printk(KERN_DEBUG "%s: release an RX reorder "
673 "frame due to timeout on earlier "
674 "frames\n",
675 wiphy_name(hw->wiphy));
676#endif
Johannes Berg2569a822009-11-25 17:46:17 +0100677 ieee80211_release_reorder_frame(hw, tid_agg_rx,
678 j, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100679
680 /*
681 * Increment the head seq# also for the skipped slots.
682 */
683 tid_agg_rx->head_seq_num =
684 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
685 skipped = 0;
686 }
687 } else while (tid_agg_rx->reorder_buf[index]) {
Johannes Berg2569a822009-11-25 17:46:17 +0100688 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100689 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
690 tid_agg_rx->buf_size;
691 }
692
693 return true;
694}
695
696/*
697 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
698 * true if the MPDU was buffered, false if it should be processed.
699 */
Johannes Berg2569a822009-11-25 17:46:17 +0100700static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
701 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100702{
Johannes Berg2569a822009-11-25 17:46:17 +0100703 struct sk_buff *skb = rx->skb;
704 struct ieee80211_local *local = rx->local;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100705 struct ieee80211_hw *hw = &local->hw;
706 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Johannes Berg2569a822009-11-25 17:46:17 +0100707 struct sta_info *sta = rx->sta;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100708 struct tid_ampdu_rx *tid_agg_rx;
709 u16 sc;
710 int tid;
711
712 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg2569a822009-11-25 17:46:17 +0100713 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100714
715 /*
716 * filter the QoS data rx stream according to
717 * STA/TID and check if this STA/TID is on aggregation
718 */
719
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100720 if (!sta)
Johannes Berg2569a822009-11-25 17:46:17 +0100721 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100722
723 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
724
725 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
Johannes Berg2569a822009-11-25 17:46:17 +0100726 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100727
728 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
729
730 /* qos null data frames are excluded */
731 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Johannes Berg2569a822009-11-25 17:46:17 +0100732 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100733
734 /* new, potentially un-ordered, ampdu frame - process it */
735
736 /* reset session timer */
737 if (tid_agg_rx->timeout)
738 mod_timer(&tid_agg_rx->session_timer,
739 TU_TO_EXP_TIME(tid_agg_rx->timeout));
740
741 /* if this mpdu is fragmented - terminate rx aggregation session */
742 sc = le16_to_cpu(hdr->seq_ctrl);
743 if (sc & IEEE80211_SCTL_FRAG) {
744 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
745 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
746 dev_kfree_skb(skb);
Johannes Berg2569a822009-11-25 17:46:17 +0100747 return;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100748 }
749
Johannes Berg2569a822009-11-25 17:46:17 +0100750 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
751 return;
752
753 dont_reorder:
754 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100755}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100756
Johannes Berg49461622008-06-30 15:10:45 +0200757static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100758ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200759{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700760 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +0200761
762 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
763 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700764 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100765 rx->sta->last_seq_ctrl[rx->queue] ==
Johannes Berg571ecf62007-07-27 15:43:22 +0200766 hdr->seq_ctrl)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +0100767 if (rx->flags & IEEE80211_RX_RA_MATCH) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200768 rx->local->dot11FrameDuplicateCount++;
769 rx->sta->num_duplicates++;
770 }
Johannes Berge4c26ad2008-01-31 19:48:21 +0100771 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200772 } else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100773 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +0200774 }
775
Johannes Berg571ecf62007-07-27 15:43:22 +0200776 if (unlikely(rx->skb->len < 16)) {
777 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100778 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200779 }
780
Johannes Berg571ecf62007-07-27 15:43:22 +0200781 /* Drop disallowed frame classes based on STA auth/assoc state;
782 * IEEE 802.11, Chap 5.5.
783 *
Johannes Bergccd7b362008-09-11 00:01:56 +0200784 * mac80211 filters only based on association state, i.e. it drops
785 * Class 3 frames from not associated stations. hostapd sends
Johannes Berg571ecf62007-07-27 15:43:22 +0200786 * deauth/disassoc frames when needed. In addition, hostapd is
787 * responsible for filtering on both auth and assoc states.
788 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100789
Johannes Berg902acc72008-02-23 15:17:19 +0100790 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100791 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100792
Harvey Harrisona7767f92008-07-02 16:30:51 -0700793 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
794 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200795 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Johannes Berg07346f812008-05-03 01:02:02 +0200796 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700797 if ((!ieee80211_has_fromds(hdr->frame_control) &&
798 !ieee80211_has_tods(hdr->frame_control) &&
799 ieee80211_is_data(hdr->frame_control)) ||
800 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200801 /* Drop IBSS frames and frames for other hosts
802 * silently. */
Johannes Berge4c26ad2008-01-31 19:48:21 +0100803 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200804 }
805
Johannes Berge4c26ad2008-01-31 19:48:21 +0100806 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200807 }
808
Johannes Berg9ae54c82008-01-31 19:48:20 +0100809 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +0200810}
811
812
Johannes Berg49461622008-06-30 15:10:45 +0200813static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100814ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
Johannes Berg570bd532007-07-27 15:43:22 +0200815{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100816 struct sk_buff *skb = rx->skb;
817 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
818 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg3017b802007-08-28 17:01:53 -0400819 int keyidx;
820 int hdrlen;
Johannes Berge4c26ad2008-01-31 19:48:21 +0100821 ieee80211_rx_result result = RX_DROP_UNUSABLE;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400822 struct ieee80211_key *stakey = NULL;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200823 int mmie_keyidx = -1;
Johannes Berg570bd532007-07-27 15:43:22 +0200824
Johannes Berg3017b802007-08-28 17:01:53 -0400825 /*
826 * Key selection 101
827 *
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200828 * There are four types of keys:
Johannes Berg3017b802007-08-28 17:01:53 -0400829 * - GTK (group keys)
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200830 * - IGTK (group keys for management frames)
Johannes Berg3017b802007-08-28 17:01:53 -0400831 * - PTK (pairwise keys)
832 * - STK (station-to-station pairwise keys)
833 *
834 * When selecting a key, we have to distinguish between multicast
835 * (including broadcast) and unicast frames, the latter can only
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200836 * use PTKs and STKs while the former always use GTKs and IGTKs.
837 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
838 * unicast frames can also use key indices like GTKs. Hence, if we
839 * don't have a PTK/STK we check the key index for a WEP key.
Johannes Berg3017b802007-08-28 17:01:53 -0400840 *
Johannes Berg8dc06a12007-08-28 17:01:55 -0400841 * Note that in a regular BSS, multicast frames are sent by the
842 * AP only, associated stations unicast the frame to the AP first
843 * which then multicasts it on their behalf.
844 *
Johannes Berg3017b802007-08-28 17:01:53 -0400845 * There is also a slight problem in IBSS mode: GTKs are negotiated
846 * with each station, that is something we don't currently handle.
Johannes Berg8dc06a12007-08-28 17:01:55 -0400847 * The spec seems to expect that one negotiates the same key with
848 * every station but there's no such requirement; VLANs could be
849 * possible.
Johannes Berg3017b802007-08-28 17:01:53 -0400850 */
Johannes Berg571ecf62007-07-27 15:43:22 +0200851
Johannes Berg3017b802007-08-28 17:01:53 -0400852 /*
Johannes Berg1990af82007-09-26 17:53:15 +0200853 * No point in finding a key and decrypting if the frame is neither
Johannes Berg3017b802007-08-28 17:01:53 -0400854 * addressed to us nor a multicast frame.
855 */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100856 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100857 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -0400858
Johannes Berg2569a822009-11-25 17:46:17 +0100859 /* start without a key */
860 rx->key = NULL;
861
Johannes Bergd4e46a32007-09-14 11:10:24 -0400862 if (rx->sta)
863 stakey = rcu_dereference(rx->sta->key);
864
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300865 if (!ieee80211_has_protected(hdr->frame_control))
866 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
867
Johannes Bergd4e46a32007-09-14 11:10:24 -0400868 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
869 rx->key = stakey;
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300870 /* Skip decryption if the frame is not protected. */
871 if (!ieee80211_has_protected(hdr->frame_control))
872 return RX_CONTINUE;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200873 } else if (mmie_keyidx >= 0) {
874 /* Broadcast/multicast robust management frame / BIP */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100875 if ((status->flag & RX_FLAG_DECRYPTED) &&
876 (status->flag & RX_FLAG_IV_STRIPPED))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200877 return RX_CONTINUE;
878
879 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
880 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
881 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
882 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300883 } else if (!ieee80211_has_protected(hdr->frame_control)) {
884 /*
885 * The frame was not protected, so skip decryption. However, we
886 * need to set rx->key if there is a key that could have been
887 * used so that the frame may be dropped if encryption would
888 * have been expected.
889 */
890 struct ieee80211_key *key = NULL;
891 if (ieee80211_is_mgmt(hdr->frame_control) &&
892 is_multicast_ether_addr(hdr->addr1) &&
893 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
894 rx->key = key;
895 else if ((key = rcu_dereference(rx->sdata->default_key)))
896 rx->key = key;
897 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200898 } else {
Johannes Berg3017b802007-08-28 17:01:53 -0400899 /*
900 * The device doesn't give us the IV so we won't be
901 * able to look up the key. That's ok though, we
902 * don't need to decrypt the frame, we just won't
903 * be able to keep statistics accurate.
904 * Except for key threshold notifications, should
905 * we somehow allow the driver to tell us which key
906 * the hardware used if this flag is set?
907 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100908 if ((status->flag & RX_FLAG_DECRYPTED) &&
909 (status->flag & RX_FLAG_IV_STRIPPED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100910 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200911
Harvey Harrisona7767f92008-07-02 16:30:51 -0700912 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +0200913
Johannes Berg3017b802007-08-28 17:01:53 -0400914 if (rx->skb->len < 8 + hdrlen)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100915 return RX_DROP_UNUSABLE; /* TODO: count this? */
Johannes Berg571ecf62007-07-27 15:43:22 +0200916
Johannes Berg3017b802007-08-28 17:01:53 -0400917 /*
918 * no need to call ieee80211_wep_get_keyidx,
919 * it verifies a bunch of things we've done already
920 */
921 keyidx = rx->skb->data[hdrlen + 3] >> 6;
922
Johannes Bergd4e46a32007-09-14 11:10:24 -0400923 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
Johannes Berg3017b802007-08-28 17:01:53 -0400924
925 /*
926 * RSNA-protected unicast frames should always be sent with
927 * pairwise or station-to-station keys, but for WEP we allow
928 * using a key index as well.
929 */
Johannes Berg8f20fc22007-08-28 17:01:54 -0400930 if (rx->key && rx->key->conf.alg != ALG_WEP &&
Johannes Berg3017b802007-08-28 17:01:53 -0400931 !is_multicast_ether_addr(hdr->addr1))
932 rx->key = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +0200933 }
934
Johannes Berg3017b802007-08-28 17:01:53 -0400935 if (rx->key) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200936 rx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -0400937 /* TODO: add threshold stuff again */
Johannes Berg1990af82007-09-26 17:53:15 +0200938 } else {
Johannes Berge4c26ad2008-01-31 19:48:21 +0100939 return RX_DROP_MONITOR;
Johannes Berg70f08762007-09-26 17:53:14 +0200940 }
941
Johannes Berg1990af82007-09-26 17:53:15 +0200942 /* Check for weak IVs if possible */
943 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
Harvey Harrisona7767f92008-07-02 16:30:51 -0700944 ieee80211_is_data(hdr->frame_control) &&
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100945 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
946 !(status->flag & RX_FLAG_DECRYPTED)) &&
Johannes Berg1990af82007-09-26 17:53:15 +0200947 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
948 rx->sta->wep_weak_iv_count++;
949
Johannes Berg70f08762007-09-26 17:53:14 +0200950 switch (rx->key->conf.alg) {
951 case ALG_WEP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200952 result = ieee80211_crypto_wep_decrypt(rx);
953 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200954 case ALG_TKIP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200955 result = ieee80211_crypto_tkip_decrypt(rx);
956 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200957 case ALG_CCMP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200958 result = ieee80211_crypto_ccmp_decrypt(rx);
959 break;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200960 case ALG_AES_CMAC:
961 result = ieee80211_crypto_aes_cmac_decrypt(rx);
962 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200963 }
964
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200965 /* either the frame has been decrypted or will be dropped */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100966 status->flag |= RX_FLAG_DECRYPTED;
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200967
968 return result;
Johannes Berg70f08762007-09-26 17:53:14 +0200969}
970
Kalle Valo572e0012009-02-10 17:09:31 +0200971static ieee80211_rx_result debug_noinline
972ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
973{
974 struct ieee80211_local *local;
975 struct ieee80211_hdr *hdr;
976 struct sk_buff *skb;
977
978 local = rx->local;
979 skb = rx->skb;
980 hdr = (struct ieee80211_hdr *) skb->data;
981
982 if (!local->pspolling)
983 return RX_CONTINUE;
984
985 if (!ieee80211_has_fromds(hdr->frame_control))
986 /* this is not from AP */
987 return RX_CONTINUE;
988
989 if (!ieee80211_is_data(hdr->frame_control))
990 return RX_CONTINUE;
991
992 if (!ieee80211_has_moredata(hdr->frame_control)) {
993 /* AP has no more frames buffered for us */
994 local->pspolling = false;
995 return RX_CONTINUE;
996 }
997
998 /* more data bit is set, let's request a new frame from the AP */
999 ieee80211_send_pspoll(local, rx->sdata);
1000
1001 return RX_CONTINUE;
1002}
1003
Johannes Berg133b8222008-09-16 14:18:59 +02001004static void ap_sta_ps_start(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001005{
Johannes Berg133b8222008-09-16 14:18:59 +02001006 struct ieee80211_sub_if_data *sdata = sta->sdata;
Christian Lamparter4571d3b2008-11-30 00:48:41 +01001007 struct ieee80211_local *local = sdata->local;
Joe Perches0795af52007-10-03 17:59:30 -07001008
Johannes Berg3e122be2008-07-09 14:40:34 +02001009 atomic_inc(&sdata->bss->num_sta_ps);
Johannes Bergaf818582009-11-06 11:35:50 +01001010 set_sta_flags(sta, WLAN_STA_PS_STA);
Johannes Berg12375ef2009-11-25 20:30:31 +01001011 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001012#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001013 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001014 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001015#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1016}
1017
Johannes Bergff9458d2009-10-30 12:56:02 +01001018static void ap_sta_ps_end(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001019{
Johannes Berg133b8222008-09-16 14:18:59 +02001020 struct ieee80211_sub_if_data *sdata = sta->sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02001021
Johannes Berg3e122be2008-07-09 14:40:34 +02001022 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg004c8722008-02-20 11:21:35 +01001023
Johannes Bergaf818582009-11-06 11:35:50 +01001024 clear_sta_flags(sta, WLAN_STA_PS_STA);
Johannes Berg004c8722008-02-20 11:21:35 +01001025
Johannes Berg571ecf62007-07-27 15:43:22 +02001026#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001027 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001028 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001029#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg004c8722008-02-20 11:21:35 +01001030
Johannes Bergaf818582009-11-06 11:35:50 +01001031 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001032#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Bergaf818582009-11-06 11:35:50 +01001033 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001034 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001035#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Bergaf818582009-11-06 11:35:50 +01001036 return;
1037 }
1038
1039 ieee80211_sta_ps_deliver_wakeup(sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001040}
1041
Johannes Berg49461622008-06-30 15:10:45 +02001042static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001043ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001044{
1045 struct sta_info *sta = rx->sta;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001046 struct sk_buff *skb = rx->skb;
1047 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1048 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001049
1050 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001051 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001052
Johannes Bergb291ba12009-07-10 15:29:03 +02001053 /*
1054 * Update last_rx only for IBSS packets which are for the current
1055 * BSSID to avoid keeping the current IBSS network alive in cases
1056 * where other STAs start using different BSSID.
1057 */
Johannes Berg05c914f2008-09-11 00:01:58 +02001058 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001059 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +02001060 NL80211_IFTYPE_ADHOC);
Johannes Berg46900292009-02-15 12:44:28 +01001061 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
Johannes Berg571ecf62007-07-27 15:43:22 +02001062 sta->last_rx = jiffies;
Johannes Bergb291ba12009-07-10 15:29:03 +02001063 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1064 /*
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001065 * Mesh beacons will update last_rx when if they are found to
1066 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +02001067 */
Johannes Bergb291ba12009-07-10 15:29:03 +02001068 sta->last_rx = jiffies;
Johannes Berg571ecf62007-07-27 15:43:22 +02001069 }
1070
Johannes Berg5cf121c2008-02-25 16:27:43 +01001071 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001072 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001073
Kalle Valo3cf335d2009-03-22 21:57:06 +02001074 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1075 ieee80211_sta_rx_notify(rx->sdata, hdr);
1076
Johannes Berg571ecf62007-07-27 15:43:22 +02001077 sta->rx_fragments++;
1078 sta->rx_bytes += rx->skb->len;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001079 sta->last_signal = status->signal;
1080 sta->last_noise = status->noise;
Johannes Berg571ecf62007-07-27 15:43:22 +02001081
Johannes Berg72eaa432008-11-26 15:02:58 +01001082 /*
1083 * Change STA power saving mode only at the end of a frame
1084 * exchange sequence.
1085 */
Johannes Berg3e122be2008-07-09 14:40:34 +02001086 if (!ieee80211_has_morefrags(hdr->frame_control) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001087 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1088 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
Johannes Bergaf818582009-11-06 11:35:50 +01001089 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
Johannes Berg72eaa432008-11-26 15:02:58 +01001090 /*
1091 * Ignore doze->wake transitions that are
1092 * indicated by non-data frames, the standard
1093 * is unclear here, but for example going to
1094 * PS mode and then scanning would cause a
1095 * doze->wake transition for the probe request,
1096 * and that is clearly undesirable.
1097 */
1098 if (ieee80211_is_data(hdr->frame_control) &&
1099 !ieee80211_has_pm(hdr->frame_control))
Johannes Bergff9458d2009-10-30 12:56:02 +01001100 ap_sta_ps_end(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001101 } else {
1102 if (ieee80211_has_pm(hdr->frame_control))
1103 ap_sta_ps_start(sta);
1104 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001105 }
1106
Johannes Berg22403de2009-10-30 12:55:03 +01001107 /*
1108 * Drop (qos-)data::nullfunc frames silently, since they
1109 * are used only to control station power saving mode.
1110 */
1111 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1112 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001113 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
Johannes Berg22403de2009-10-30 12:55:03 +01001114 /*
1115 * Update counter and free packet here to avoid
1116 * counting this as a dropped packed.
1117 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001118 sta->rx_packets++;
1119 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001120 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001121 }
1122
Johannes Berg9ae54c82008-01-31 19:48:20 +01001123 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001124} /* ieee80211_rx_h_sta_process */
1125
Johannes Berg571ecf62007-07-27 15:43:22 +02001126static inline struct ieee80211_fragment_entry *
1127ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1128 unsigned int frag, unsigned int seq, int rx_queue,
1129 struct sk_buff **skb)
1130{
1131 struct ieee80211_fragment_entry *entry;
1132 int idx;
1133
1134 idx = sdata->fragment_next;
1135 entry = &sdata->fragments[sdata->fragment_next++];
1136 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1137 sdata->fragment_next = 0;
1138
1139 if (!skb_queue_empty(&entry->skb_list)) {
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001140#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg571ecf62007-07-27 15:43:22 +02001141 struct ieee80211_hdr *hdr =
1142 (struct ieee80211_hdr *) entry->skb_list.next->data;
1143 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1144 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
Johannes Berg0c68ae262008-10-27 15:56:10 -07001145 "addr1=%pM addr2=%pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001146 sdata->name, idx,
Johannes Berg571ecf62007-07-27 15:43:22 +02001147 jiffies - entry->first_frag_time, entry->seq,
Johannes Berg0c68ae262008-10-27 15:56:10 -07001148 entry->last_frag, hdr->addr1, hdr->addr2);
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001149#endif
Johannes Berg571ecf62007-07-27 15:43:22 +02001150 __skb_queue_purge(&entry->skb_list);
1151 }
1152
1153 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1154 *skb = NULL;
1155 entry->first_frag_time = jiffies;
1156 entry->seq = seq;
1157 entry->rx_queue = rx_queue;
1158 entry->last_frag = frag;
1159 entry->ccmp = 0;
1160 entry->extra_len = 0;
1161
1162 return entry;
1163}
1164
1165static inline struct ieee80211_fragment_entry *
1166ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001167 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +02001168 int rx_queue, struct ieee80211_hdr *hdr)
1169{
1170 struct ieee80211_fragment_entry *entry;
1171 int i, idx;
1172
1173 idx = sdata->fragment_next;
1174 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1175 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +02001176
1177 idx--;
1178 if (idx < 0)
1179 idx = IEEE80211_FRAGMENT_MAX - 1;
1180
1181 entry = &sdata->fragments[idx];
1182 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1183 entry->rx_queue != rx_queue ||
1184 entry->last_frag + 1 != frag)
1185 continue;
1186
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001187 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001188
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001189 /*
1190 * Check ftype and addresses are equal, else check next fragment
1191 */
1192 if (((hdr->frame_control ^ f_hdr->frame_control) &
1193 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001194 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1195 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1196 continue;
1197
S.Çağlar Onurab466232008-02-14 17:36:47 +02001198 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001199 __skb_queue_purge(&entry->skb_list);
1200 continue;
1201 }
1202 return entry;
1203 }
1204
1205 return NULL;
1206}
1207
Johannes Berg49461622008-06-30 15:10:45 +02001208static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001209ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001210{
1211 struct ieee80211_hdr *hdr;
1212 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001213 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001214 unsigned int frag, seq;
1215 struct ieee80211_fragment_entry *entry;
1216 struct sk_buff *skb;
1217
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001218 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001219 fc = hdr->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02001220 sc = le16_to_cpu(hdr->seq_ctrl);
1221 frag = sc & IEEE80211_SCTL_FRAG;
1222
Harvey Harrison358c8d92008-07-15 18:44:13 -07001223 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001224 (rx->skb)->len < 24 ||
1225 is_multicast_ether_addr(hdr->addr1))) {
1226 /* not fragmented */
1227 goto out;
1228 }
1229 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1230
1231 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1232
1233 if (frag == 0) {
1234 /* This is the first fragment of a new frame. */
1235 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001236 rx->queue, &(rx->skb));
Johannes Berg8f20fc22007-08-28 17:01:54 -04001237 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
Harvey Harrison358c8d92008-07-15 18:44:13 -07001238 ieee80211_has_protected(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001239 /* Store CCMP PN so that we can verify that the next
1240 * fragment has a sequential PN value. */
1241 entry->ccmp = 1;
1242 memcpy(entry->last_pn,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001243 rx->key->u.ccmp.rx_pn[rx->queue],
Johannes Berg571ecf62007-07-27 15:43:22 +02001244 CCMP_PN_LEN);
1245 }
Johannes Berg9ae54c82008-01-31 19:48:20 +01001246 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001247 }
1248
1249 /* This is a fragment for a frame that should already be pending in
1250 * fragment cache. Add this fragment to the end of the pending entry.
1251 */
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001252 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001253 if (!entry) {
1254 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001255 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001256 }
1257
1258 /* Verify that MPDUs within one MSDU have sequential PN values.
1259 * (IEEE 802.11i, 8.3.3.4.5) */
1260 if (entry->ccmp) {
1261 int i;
1262 u8 pn[CCMP_PN_LEN], *rpn;
Johannes Berg8f20fc22007-08-28 17:01:54 -04001263 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001264 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001265 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1266 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1267 pn[i]++;
1268 if (pn[i])
1269 break;
1270 }
Johannes Berg5cf121c2008-02-25 16:27:43 +01001271 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001272 if (memcmp(pn, rpn, CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001273 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001274 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1275 }
1276
Harvey Harrison358c8d92008-07-15 18:44:13 -07001277 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +02001278 __skb_queue_tail(&entry->skb_list, rx->skb);
1279 entry->last_frag = frag;
1280 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001281 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001282 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001283 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001284 }
1285
1286 rx->skb = __skb_dequeue(&entry->skb_list);
1287 if (skb_tailroom(rx->skb) < entry->extra_len) {
1288 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1289 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1290 GFP_ATOMIC))) {
1291 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1292 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001293 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001294 }
1295 }
1296 while ((skb = __skb_dequeue(&entry->skb_list))) {
1297 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1298 dev_kfree_skb(skb);
1299 }
1300
1301 /* Complete frame has been reassembled - process it now */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001302 rx->flags |= IEEE80211_RX_FRAGMENTED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001303
1304 out:
1305 if (rx->sta)
1306 rx->sta->rx_packets++;
1307 if (is_multicast_ether_addr(hdr->addr1))
1308 rx->local->dot11MulticastReceivedFrameCount++;
1309 else
1310 ieee80211_led_rx(rx->local);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001311 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001312}
1313
Johannes Berg49461622008-06-30 15:10:45 +02001314static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001315ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001316{
Johannes Bergaf818582009-11-06 11:35:50 +01001317 struct ieee80211_sub_if_data *sdata = rx->sdata;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001318 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02001319
Harvey Harrison358c8d92008-07-15 18:44:13 -07001320 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
Johannes Berg5cf121c2008-02-25 16:27:43 +01001321 !(rx->flags & IEEE80211_RX_RA_MATCH)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001322 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001323
Johannes Berg05c914f2008-09-11 00:01:58 +02001324 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1325 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001326 return RX_DROP_UNUSABLE;
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +02001327
Johannes Bergaf818582009-11-06 11:35:50 +01001328 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1329 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1330 else
1331 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
Johannes Berg571ecf62007-07-27 15:43:22 +02001332
Johannes Berg9ae54c82008-01-31 19:48:20 +01001333 /* Free PS Poll skb here instead of returning RX_DROP that would
Johannes Berg571ecf62007-07-27 15:43:22 +02001334 * count as an dropped frame. */
1335 dev_kfree_skb(rx->skb);
1336
Johannes Berg9ae54c82008-01-31 19:48:20 +01001337 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001338}
1339
Johannes Berg49461622008-06-30 15:10:45 +02001340static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001341ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +02001342{
Johannes Berg6e0d1142007-07-27 15:43:22 +02001343 u8 *data = rx->skb->data;
Harvey Harrison238f74a2008-07-02 11:05:34 -07001344 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001345
Harvey Harrison238f74a2008-07-02 11:05:34 -07001346 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001347 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001348
1349 /* remove the qos control field, update frame type and meta-data */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001350 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1351 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1352 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001353 /* change frame type to non QOS */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001354 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001355
Johannes Berg9ae54c82008-01-31 19:48:20 +01001356 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001357}
1358
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001359static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001360ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001361{
Johannes Berg07346f812008-05-03 01:02:02 +02001362 if (unlikely(!rx->sta ||
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001363 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001364 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001365
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001366 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001367}
1368
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001369static int
Harvey Harrison358c8d92008-07-15 18:44:13 -07001370ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02001371{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001372 struct sk_buff *skb = rx->skb;
1373 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1374
Johannes Berg3017b802007-08-28 17:01:53 -04001375 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001376 * Pass through unencrypted frames if the hardware has
1377 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001378 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001379 if (status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001380 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001381
1382 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001383 if (unlikely(!ieee80211_has_protected(fc) &&
1384 !ieee80211_is_nullfunc(fc) &&
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001385 ieee80211_is_data(fc) &&
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001386 (rx->key || rx->sdata->drop_unencrypted)))
1387 return -EACCES;
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001388 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1389 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1390 rx->key))
1391 return -EACCES;
1392 /* BIP does not use Protected field, so need to check MMIE */
Joe Perchesf64f9e72009-11-29 16:55:45 -08001393 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1394 ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001395 rx->key))
1396 return -EACCES;
1397 /*
1398 * When using MFP, Action frames are not allowed prior to
1399 * having configured keys.
1400 */
1401 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1402 ieee80211_is_robust_mgmt_frame(
1403 (struct ieee80211_hdr *) rx->skb->data)))
1404 return -EACCES;
1405 }
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001406
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001407 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001408}
1409
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001410static int
Zhu Yie31a16d2009-05-21 21:47:03 +08001411__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001412{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001413 struct ieee80211_sub_if_data *sdata = rx->sdata;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001414 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1415
Johannes Berg9bc383d2009-11-19 11:55:19 +01001416 if (ieee80211_has_a4(hdr->frame_control) &&
1417 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001418 return -1;
Johannes Berg9bc383d2009-11-19 11:55:19 +01001419
1420 if (is_multicast_ether_addr(hdr->addr1) &&
1421 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1422 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001423 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001424
Johannes Berg47846c92009-11-25 17:46:19 +01001425 return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001426}
Johannes Berg571ecf62007-07-27 15:43:22 +02001427
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001428/*
1429 * requires that rx->skb is a frame with ethernet header
1430 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001431static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001432{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301433 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001434 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1435 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1436
1437 /*
1438 * Allow EAPOL frames to us/the PAE group address regardless
1439 * of whether the frame was encrypted or not.
1440 */
1441 if (ehdr->h_proto == htons(ETH_P_PAE) &&
Johannes Berg47846c92009-11-25 17:46:19 +01001442 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001443 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1444 return true;
1445
1446 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07001447 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001448 return false;
1449
1450 return true;
1451}
1452
1453/*
1454 * requires that rx->skb is a frame with ethernet header
1455 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001456static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01001457ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001458{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001459 struct ieee80211_sub_if_data *sdata = rx->sdata;
1460 struct net_device *dev = sdata->dev;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001461 struct sk_buff *skb, *xmit_skb;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001462 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1463 struct sta_info *dsta;
Johannes Berg571ecf62007-07-27 15:43:22 +02001464
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001465 skb = rx->skb;
1466 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001467
Johannes Berg05c914f2008-09-11 00:01:58 +02001468 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1469 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02001470 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg9bc383d2009-11-19 11:55:19 +01001471 (rx->flags & IEEE80211_RX_RA_MATCH) &&
1472 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001473 if (is_multicast_ether_addr(ehdr->h_dest)) {
1474 /*
1475 * send multicast frames both to higher layers in
1476 * local net stack and back to the wireless medium
1477 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001478 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1479 if (!xmit_skb && net_ratelimit())
Johannes Berg571ecf62007-07-27 15:43:22 +02001480 printk(KERN_DEBUG "%s: failed to clone "
1481 "multicast frame\n", dev->name);
1482 } else {
Johannes Bergabe60632009-11-25 17:46:18 +01001483 dsta = sta_info_get(sdata, skb->data);
1484 if (dsta) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001485 /*
1486 * The destination station is associated to
1487 * this AP (in this VLAN), so send the frame
1488 * directly to it and do not pass it to local
1489 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02001490 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001491 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001492 skb = NULL;
1493 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001494 }
1495 }
1496
1497 if (skb) {
Johannes Bergd1c3a372009-01-07 00:26:10 +01001498 int align __maybe_unused;
1499
Kalle Valo59d9cb02009-12-17 13:54:57 +01001500#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
Johannes Bergd1c3a372009-01-07 00:26:10 +01001501 /*
1502 * 'align' will only take the values 0 or 2 here
1503 * since all frames are required to be aligned
1504 * to 2-byte boundaries when being passed to
1505 * mac80211. That also explains the __skb_push()
1506 * below.
1507 */
matthieu castetdacb6f12009-06-04 22:16:18 +02001508 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01001509 if (align) {
1510 if (WARN_ON(skb_headroom(skb) < 3)) {
1511 dev_kfree_skb(skb);
1512 skb = NULL;
1513 } else {
1514 u8 *data = skb->data;
Zhu Yi8ce0b582009-10-28 13:13:52 -07001515 size_t len = skb_headlen(skb);
1516 skb->data -= align;
1517 memmove(skb->data, data, len);
1518 skb_set_tail_pointer(skb, len);
Johannes Bergd1c3a372009-01-07 00:26:10 +01001519 }
1520 }
1521#endif
1522
1523 if (skb) {
1524 /* deliver to local stack */
1525 skb->protocol = eth_type_trans(skb, dev);
1526 memset(skb->cb, 0, sizeof(skb->cb));
1527 netif_rx(skb);
1528 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001529 }
1530
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001531 if (xmit_skb) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001532 /* send to wireless media */
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09001533 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001534 skb_reset_network_header(xmit_skb);
1535 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001536 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001537 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001538}
1539
Johannes Berg49461622008-06-30 15:10:45 +02001540static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001541ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001542{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001543 struct net_device *dev = rx->sdata->dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001544 struct sk_buff *skb = rx->skb;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001545 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1546 __le16 fc = hdr->frame_control;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001547 struct sk_buff_head frame_list;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001548
Harvey Harrison358c8d92008-07-15 18:44:13 -07001549 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001550 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001551
Harvey Harrison358c8d92008-07-15 18:44:13 -07001552 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001553 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001554
Johannes Berg5cf121c2008-02-25 16:27:43 +01001555 if (!(rx->flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001556 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001557
Zhu Yieaf85ca2009-12-01 10:18:37 +08001558 if (ieee80211_has_a4(hdr->frame_control) &&
1559 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1560 !rx->sdata->u.vlan.sta)
1561 return RX_DROP_UNUSABLE;
1562
1563 if (is_multicast_ether_addr(hdr->addr1) &&
1564 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1565 rx->sdata->u.vlan.sta) ||
1566 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1567 rx->sdata->u.mgd.use_4addr)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001568 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001569
1570 skb->dev = dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001571 __skb_queue_head_init(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001572
Zhu Yieaf85ca2009-12-01 10:18:37 +08001573 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1574 rx->sdata->vif.type,
1575 rx->local->hw.extra_tx_headroom);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001576
Zhu Yieaf85ca2009-12-01 10:18:37 +08001577 while (!skb_queue_empty(&frame_list)) {
1578 rx->skb = __skb_dequeue(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001579
Harvey Harrison358c8d92008-07-15 18:44:13 -07001580 if (!ieee80211_frame_allowed(rx, fc)) {
Zhu Yieaf85ca2009-12-01 10:18:37 +08001581 dev_kfree_skb(rx->skb);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001582 continue;
1583 }
Zhu Yieaf85ca2009-12-01 10:18:37 +08001584 dev->stats.rx_packets++;
1585 dev->stats.rx_bytes += rx->skb->len;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001586
1587 ieee80211_deliver_skb(rx);
1588 }
1589
Johannes Berg9ae54c82008-01-31 19:48:20 +01001590 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001591}
1592
Ingo Molnarbf94e172008-10-12 23:51:38 -07001593#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02001594static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001595ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1596{
1597 struct ieee80211_hdr *hdr;
1598 struct ieee80211s_hdr *mesh_hdr;
1599 unsigned int hdrlen;
1600 struct sk_buff *skb = rx->skb, *fwd_skb;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001601 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001602 struct ieee80211_sub_if_data *sdata = rx->sdata;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001603
1604 hdr = (struct ieee80211_hdr *) skb->data;
1605 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1606 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1607
1608 if (!ieee80211_is_data(hdr->frame_control))
1609 return RX_CONTINUE;
1610
1611 if (!mesh_hdr->ttl)
1612 /* illegal frame */
1613 return RX_DROP_MONITOR;
1614
Javier Cardona43b7b312009-10-15 18:10:51 -07001615 if (mesh_hdr->flags & MESH_FLAGS_AE) {
YanBo79617de2008-09-22 13:30:32 +08001616 struct mesh_path *mppath;
Javier Cardona43b7b312009-10-15 18:10:51 -07001617 char *proxied_addr;
1618 char *mpp_addr;
1619
1620 if (is_multicast_ether_addr(hdr->addr1)) {
1621 mpp_addr = hdr->addr3;
1622 proxied_addr = mesh_hdr->eaddr1;
1623 } else {
1624 mpp_addr = hdr->addr4;
1625 proxied_addr = mesh_hdr->eaddr2;
1626 }
YanBo79617de2008-09-22 13:30:32 +08001627
YanBo79617de2008-09-22 13:30:32 +08001628 rcu_read_lock();
Javier Cardona43b7b312009-10-15 18:10:51 -07001629 mppath = mpp_path_lookup(proxied_addr, sdata);
YanBo79617de2008-09-22 13:30:32 +08001630 if (!mppath) {
Javier Cardona43b7b312009-10-15 18:10:51 -07001631 mpp_path_add(proxied_addr, mpp_addr, sdata);
YanBo79617de2008-09-22 13:30:32 +08001632 } else {
1633 spin_lock_bh(&mppath->state_lock);
Javier Cardona43b7b312009-10-15 18:10:51 -07001634 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1635 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
YanBo79617de2008-09-22 13:30:32 +08001636 spin_unlock_bh(&mppath->state_lock);
1637 }
1638 rcu_read_unlock();
1639 }
1640
Javier Cardona3c5772a2009-08-10 12:15:48 -07001641 /* Frame has reached destination. Don't forward */
1642 if (!is_multicast_ether_addr(hdr->addr1) &&
Johannes Berg47846c92009-11-25 17:46:19 +01001643 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001644 return RX_CONTINUE;
1645
1646 mesh_hdr->ttl--;
1647
1648 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1649 if (!mesh_hdr->ttl)
Johannes Berg472dbc42008-09-11 00:01:49 +02001650 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001651 dropped_frames_ttl);
1652 else {
1653 struct ieee80211_hdr *fwd_hdr;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001654 struct ieee80211_tx_info *info;
1655
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001656 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1657
1658 if (!fwd_skb && net_ratelimit())
1659 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001660 sdata->name);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001661
1662 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
Johannes Berg47846c92009-11-25 17:46:19 +01001663 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001664 info = IEEE80211_SKB_CB(fwd_skb);
1665 memset(info, 0, sizeof(*info));
1666 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
Johannes Berg5061b0c2009-07-14 00:33:34 +02001667 info->control.vif = &rx->sdata->vif;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001668 ieee80211_select_queue(local, fwd_skb);
Daniel Walkerc8a61a72009-08-18 10:59:00 -07001669 if (is_multicast_ether_addr(fwd_hdr->addr1))
1670 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1671 fwded_mcast);
1672 else {
Javier Cardona3c5772a2009-08-10 12:15:48 -07001673 int err;
1674 /*
1675 * Save TA to addr1 to send TA a path error if a
1676 * suitable next hop is not found
1677 */
1678 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
Javier Cardona249b4052009-07-07 10:55:03 -07001679 ETH_ALEN);
Javier Cardona3c5772a2009-08-10 12:15:48 -07001680 err = mesh_nexthop_lookup(fwd_skb, sdata);
Javier Cardona249b4052009-07-07 10:55:03 -07001681 /* Failed to immediately resolve next hop:
1682 * fwded frame was dropped or will be added
1683 * later to the pending skb queue. */
1684 if (err)
1685 return RX_DROP_MONITOR;
Daniel Walkerc8a61a72009-08-18 10:59:00 -07001686
1687 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1688 fwded_unicast);
Javier Cardona249b4052009-07-07 10:55:03 -07001689 }
1690 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1691 fwded_frames);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001692 ieee80211_add_pending_skb(local, fwd_skb);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001693 }
1694 }
1695
Javier Cardona3c5772a2009-08-10 12:15:48 -07001696 if (is_multicast_ether_addr(hdr->addr1) ||
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001697 sdata->dev->flags & IFF_PROMISC)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001698 return RX_CONTINUE;
1699 else
1700 return RX_DROP_MONITOR;
1701}
Ingo Molnarbf94e172008-10-12 23:51:38 -07001702#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001703
1704static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001705ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001706{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001707 struct ieee80211_sub_if_data *sdata = rx->sdata;
1708 struct net_device *dev = sdata->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001709 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1710 __le16 fc = hdr->frame_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001711 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001712
Harvey Harrison358c8d92008-07-15 18:44:13 -07001713 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001714 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001715
Harvey Harrison358c8d92008-07-15 18:44:13 -07001716 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001717 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001718
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001719 /*
1720 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1721 * that a 4-addr station can be detected and moved into a separate VLAN
1722 */
1723 if (ieee80211_has_a4(hdr->frame_control) &&
1724 sdata->vif.type == NL80211_IFTYPE_AP)
1725 return RX_DROP_MONITOR;
1726
Zhu Yie31a16d2009-05-21 21:47:03 +08001727 err = __ieee80211_data_to_8023(rx);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001728 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001729 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001730
Harvey Harrison358c8d92008-07-15 18:44:13 -07001731 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001732 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001733
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001734 rx->skb->dev = dev;
1735
1736 dev->stats.rx_packets++;
1737 dev->stats.rx_bytes += rx->skb->len;
1738
1739 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02001740
Johannes Berg9ae54c82008-01-31 19:48:20 +01001741 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001742}
1743
Johannes Berg49461622008-06-30 15:10:45 +02001744static ieee80211_rx_result debug_noinline
Johannes Berg2569a822009-11-25 17:46:17 +01001745ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
Ron Rindjunsky71364712007-12-25 17:00:36 +02001746{
1747 struct ieee80211_local *local = rx->local;
1748 struct ieee80211_hw *hw = &local->hw;
1749 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07001750 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001751 struct tid_ampdu_rx *tid_agg_rx;
1752 u16 start_seq_num;
1753 u16 tid;
1754
Harvey Harrisona7767f92008-07-02 16:30:51 -07001755 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001756 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001757
Harvey Harrisona7767f92008-07-02 16:30:51 -07001758 if (ieee80211_is_back_req(bar->frame_control)) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001759 if (!rx->sta)
Johannes Berga02ae752009-11-16 12:00:40 +01001760 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001761 tid = le16_to_cpu(bar->control) >> 12;
Ron Rindjunskycee24a32008-03-26 20:36:03 +02001762 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1763 != HT_AGG_STATE_OPERATIONAL)
Johannes Berga02ae752009-11-16 12:00:40 +01001764 return RX_DROP_MONITOR;
Ron Rindjunskycee24a32008-03-26 20:36:03 +02001765 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
Ron Rindjunsky71364712007-12-25 17:00:36 +02001766
1767 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1768
1769 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01001770 if (tid_agg_rx->timeout)
1771 mod_timer(&tid_agg_rx->session_timer,
1772 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02001773
Johannes Berga02ae752009-11-16 12:00:40 +01001774 /* release stored frames up to start of BAR */
Johannes Berg2569a822009-11-25 17:46:17 +01001775 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1776 frames);
Johannes Berga02ae752009-11-16 12:00:40 +01001777 kfree_skb(skb);
1778 return RX_QUEUED;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001779 }
1780
Johannes Berg9ae54c82008-01-31 19:48:20 +01001781 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001782}
1783
Jouni Malinenf4f727a2009-01-10 11:46:53 +02001784static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1785 struct ieee80211_mgmt *mgmt,
1786 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02001787{
1788 struct ieee80211_local *local = sdata->local;
1789 struct sk_buff *skb;
1790 struct ieee80211_mgmt *resp;
1791
Johannes Berg47846c92009-11-25 17:46:19 +01001792 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
Jouni Malinenfea14732009-01-08 13:32:06 +02001793 /* Not to own unicast address */
1794 return;
1795 }
1796
Johannes Berg46900292009-02-15 12:44:28 +01001797 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1798 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
Johannes Berg77fdaa12009-07-07 03:45:17 +02001799 /* Not from the current AP or not associated yet. */
Jouni Malinenfea14732009-01-08 13:32:06 +02001800 return;
1801 }
1802
1803 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1804 /* Too short SA Query request frame */
1805 return;
1806 }
1807
1808 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1809 if (skb == NULL)
1810 return;
1811
1812 skb_reserve(skb, local->hw.extra_tx_headroom);
1813 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1814 memset(resp, 0, 24);
1815 memcpy(resp->da, mgmt->sa, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01001816 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01001817 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02001818 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1819 IEEE80211_STYPE_ACTION);
1820 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1821 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1822 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1823 memcpy(resp->u.action.u.sa_query.trans_id,
1824 mgmt->u.action.u.sa_query.trans_id,
1825 WLAN_SA_QUERY_TR_ID_LEN);
1826
Johannes Berg62ae67b2009-11-18 18:42:05 +01001827 ieee80211_tx_skb(sdata, skb);
Jouni Malinenfea14732009-01-08 13:32:06 +02001828}
1829
Johannes Berg49461622008-06-30 15:10:45 +02001830static ieee80211_rx_result debug_noinline
Johannes Bergde1ede72008-09-09 14:42:50 +02001831ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1832{
1833 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001834 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergde1ede72008-09-09 14:42:50 +02001835 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1836 int len = rx->skb->len;
1837
1838 if (!ieee80211_is_action(mgmt->frame_control))
1839 return RX_CONTINUE;
1840
1841 if (!rx->sta)
1842 return RX_DROP_MONITOR;
1843
1844 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1845 return RX_DROP_MONITOR;
1846
Jouni Malinen97ebe122009-01-08 13:32:08 +02001847 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1848 return RX_DROP_MONITOR;
1849
Johannes Bergde1ede72008-09-09 14:42:50 +02001850 /* all categories we currently handle have action_code */
1851 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1852 return RX_DROP_MONITOR;
1853
Johannes Bergde1ede72008-09-09 14:42:50 +02001854 switch (mgmt->u.action.category) {
1855 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01001856 /*
1857 * The aggregation code is not prepared to handle
1858 * anything but STA/AP due to the BSSID handling;
1859 * IBSS could work in the code but isn't supported
1860 * by drivers or the standard.
1861 */
1862 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1863 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1864 sdata->vif.type != NL80211_IFTYPE_AP)
1865 return RX_DROP_MONITOR;
1866
Johannes Bergde1ede72008-09-09 14:42:50 +02001867 switch (mgmt->u.action.u.addba_req.action_code) {
1868 case WLAN_ACTION_ADDBA_REQ:
1869 if (len < (IEEE80211_MIN_ACTION_SIZE +
1870 sizeof(mgmt->u.action.u.addba_req)))
1871 return RX_DROP_MONITOR;
1872 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1873 break;
1874 case WLAN_ACTION_ADDBA_RESP:
1875 if (len < (IEEE80211_MIN_ACTION_SIZE +
1876 sizeof(mgmt->u.action.u.addba_resp)))
1877 return RX_DROP_MONITOR;
1878 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1879 break;
1880 case WLAN_ACTION_DELBA:
1881 if (len < (IEEE80211_MIN_ACTION_SIZE +
1882 sizeof(mgmt->u.action.u.delba)))
1883 return RX_DROP_MONITOR;
1884 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1885 break;
1886 }
Johannes Berg39192c02008-09-09 14:49:03 +02001887 break;
1888 case WLAN_CATEGORY_SPECTRUM_MGMT:
1889 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1890 return RX_DROP_MONITOR;
Johannes Berg46900292009-02-15 12:44:28 +01001891
1892 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1893 return RX_DROP_MONITOR;
1894
Johannes Berg39192c02008-09-09 14:49:03 +02001895 switch (mgmt->u.action.u.measurement.action_code) {
1896 case WLAN_ACTION_SPCT_MSR_REQ:
1897 if (len < (IEEE80211_MIN_ACTION_SIZE +
1898 sizeof(mgmt->u.action.u.measurement)))
1899 return RX_DROP_MONITOR;
1900 ieee80211_process_measurement_req(sdata, mgmt, len);
1901 break;
Sujithc481ec92009-01-06 09:28:37 +05301902 case WLAN_ACTION_SPCT_CHL_SWITCH:
1903 if (len < (IEEE80211_MIN_ACTION_SIZE +
1904 sizeof(mgmt->u.action.u.chan_switch)))
1905 return RX_DROP_MONITOR;
1906
Johannes Bergcc32abd2009-05-15 11:52:31 +02001907 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1908 return RX_DROP_MONITOR;
1909
Johannes Berg46900292009-02-15 12:44:28 +01001910 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
Sujithc481ec92009-01-06 09:28:37 +05301911 return RX_DROP_MONITOR;
1912
Johannes Berg77fdaa12009-07-07 03:45:17 +02001913 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
Johannes Berg39192c02008-09-09 14:49:03 +02001914 }
1915 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02001916 case WLAN_CATEGORY_SA_QUERY:
1917 if (len < (IEEE80211_MIN_ACTION_SIZE +
1918 sizeof(mgmt->u.action.u.sa_query)))
1919 return RX_DROP_MONITOR;
1920 switch (mgmt->u.action.u.sa_query.action) {
1921 case WLAN_ACTION_SA_QUERY_REQUEST:
1922 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1923 return RX_DROP_MONITOR;
1924 ieee80211_process_sa_query_req(sdata, mgmt, len);
1925 break;
1926 case WLAN_ACTION_SA_QUERY_RESPONSE:
1927 /*
1928 * SA Query response is currently only used in AP mode
1929 * and it is processed in user space.
1930 */
1931 return RX_CONTINUE;
1932 }
1933 break;
Johannes Berg39192c02008-09-09 14:49:03 +02001934 default:
1935 return RX_CONTINUE;
Johannes Bergde1ede72008-09-09 14:42:50 +02001936 }
1937
Johannes Berg39192c02008-09-09 14:49:03 +02001938 rx->sta->rx_packets++;
1939 dev_kfree_skb(rx->skb);
1940 return RX_QUEUED;
Johannes Bergde1ede72008-09-09 14:42:50 +02001941}
1942
1943static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001944ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001945{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001946 struct ieee80211_sub_if_data *sdata = rx->sdata;
Jouni Malinen97ebe122009-01-08 13:32:08 +02001947 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Bergaf6b6372009-12-23 13:15:35 +01001948 ieee80211_rx_result rxs;
Johannes Berg571ecf62007-07-27 15:43:22 +02001949
Johannes Berg5cf121c2008-02-25 16:27:43 +01001950 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001951 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001952
Jouni Malinen97ebe122009-01-08 13:32:08 +02001953 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1954 return RX_DROP_MONITOR;
1955
Johannes Bergaf6b6372009-12-23 13:15:35 +01001956 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
1957 if (rxs != RX_CONTINUE)
1958 return rxs;
1959
Johannes Berg472dbc42008-09-11 00:01:49 +02001960 if (ieee80211_vif_is_mesh(&sdata->vif))
Johannes Bergf1d58c22009-06-17 13:13:00 +02001961 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
Johannes Berg472dbc42008-09-11 00:01:49 +02001962
Johannes Berg3832c282009-03-24 08:46:57 +01001963 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
Johannes Bergf1d58c22009-06-17 13:13:00 +02001964 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
Johannes Bergf9d540e2007-09-28 14:02:09 +02001965
Johannes Berg7986cf92009-03-21 17:08:43 +01001966 if (sdata->vif.type == NL80211_IFTYPE_STATION)
Johannes Bergf1d58c22009-06-17 13:13:00 +02001967 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
Johannes Berg46900292009-02-15 12:44:28 +01001968
Johannes Berg7986cf92009-03-21 17:08:43 +01001969 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001970}
1971
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001972static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001973 struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001974{
Harvey Harrisona7767f92008-07-02 16:30:51 -07001975 int keyidx;
1976 unsigned int hdrlen;
Johannes Berg571ecf62007-07-27 15:43:22 +02001977
Harvey Harrisona7767f92008-07-02 16:30:51 -07001978 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +02001979 if (rx->skb->len >= hdrlen + 4)
1980 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1981 else
1982 keyidx = -1;
1983
Johannes Berg8944b792008-01-31 19:48:26 +01001984 if (!rx->sta) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001985 /*
1986 * Some hardware seem to generate incorrect Michael MIC
1987 * reports; ignore them to avoid triggering countermeasures.
1988 */
Johannes Bergaf2ced62009-11-16 12:00:39 +01001989 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02001990 }
1991
Harvey Harrisona7767f92008-07-02 16:30:51 -07001992 if (!ieee80211_has_protected(hdr->frame_control))
Johannes Bergaf2ced62009-11-16 12:00:39 +01001993 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02001994
Johannes Berg05c914f2008-09-11 00:01:58 +02001995 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001996 /*
1997 * APs with pairwise keys should never receive Michael MIC
1998 * errors for non-zero keyidx because these are reserved for
1999 * group keys and only the AP is sending real multicast
2000 * frames in the BSS.
2001 */
Johannes Bergaf2ced62009-11-16 12:00:39 +01002002 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002003 }
2004
Harvey Harrisona7767f92008-07-02 16:30:51 -07002005 if (!ieee80211_is_data(hdr->frame_control) &&
2006 !ieee80211_is_auth(hdr->frame_control))
Johannes Bergaf2ced62009-11-16 12:00:39 +01002007 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002008
Johannes Berge6d6e342009-07-01 21:26:47 +02002009 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2010 GFP_ATOMIC);
Johannes Berg571ecf62007-07-27 15:43:22 +02002011}
2012
Johannes Berg5cf121c2008-02-25 16:27:43 +01002013/* TODO: use IEEE80211_RX_FRAGMENTED */
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002014static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2015 struct ieee80211_rate *rate)
Michael Wu3d30d942008-01-31 19:48:27 +01002016{
2017 struct ieee80211_sub_if_data *sdata;
2018 struct ieee80211_local *local = rx->local;
2019 struct ieee80211_rtap_hdr {
2020 struct ieee80211_radiotap_header hdr;
2021 u8 flags;
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002022 u8 rate_or_pad;
Michael Wu3d30d942008-01-31 19:48:27 +01002023 __le16 chan_freq;
2024 __le16 chan_flags;
2025 } __attribute__ ((packed)) *rthdr;
2026 struct sk_buff *skb = rx->skb, *skb2;
2027 struct net_device *prev_dev = NULL;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002028 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Michael Wu3d30d942008-01-31 19:48:27 +01002029
Johannes Berg8c0c7092009-11-25 17:46:15 +01002030 if (status->flag & RX_FLAG_INTERNAL_CMTR)
Michael Wu3d30d942008-01-31 19:48:27 +01002031 goto out_free_skb;
2032
2033 if (skb_headroom(skb) < sizeof(*rthdr) &&
2034 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2035 goto out_free_skb;
2036
2037 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2038 memset(rthdr, 0, sizeof(*rthdr));
2039 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2040 rthdr->hdr.it_present =
2041 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
Michael Wu3d30d942008-01-31 19:48:27 +01002042 (1 << IEEE80211_RADIOTAP_CHANNEL));
2043
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002044 if (rate) {
2045 rthdr->rate_or_pad = rate->bitrate / 5;
2046 rthdr->hdr.it_present |=
2047 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2048 }
Michael Wu3d30d942008-01-31 19:48:27 +01002049 rthdr->chan_freq = cpu_to_le16(status->freq);
2050
2051 if (status->band == IEEE80211_BAND_5GHZ)
2052 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2053 IEEE80211_CHAN_5GHZ);
2054 else
2055 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2056 IEEE80211_CHAN_2GHZ);
2057
2058 skb_set_mac_header(skb, 0);
2059 skb->ip_summed = CHECKSUM_UNNECESSARY;
2060 skb->pkt_type = PACKET_OTHERHOST;
2061 skb->protocol = htons(ETH_P_802_2);
2062
2063 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01002064 if (!ieee80211_sdata_running(sdata))
Michael Wu3d30d942008-01-31 19:48:27 +01002065 continue;
2066
Johannes Berg05c914f2008-09-11 00:01:58 +02002067 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Michael Wu3d30d942008-01-31 19:48:27 +01002068 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2069 continue;
2070
2071 if (prev_dev) {
2072 skb2 = skb_clone(skb, GFP_ATOMIC);
2073 if (skb2) {
2074 skb2->dev = prev_dev;
2075 netif_rx(skb2);
2076 }
2077 }
2078
2079 prev_dev = sdata->dev;
2080 sdata->dev->stats.rx_packets++;
2081 sdata->dev->stats.rx_bytes += skb->len;
2082 }
2083
2084 if (prev_dev) {
2085 skb->dev = prev_dev;
2086 netif_rx(skb);
2087 skb = NULL;
2088 } else
2089 goto out_free_skb;
2090
Johannes Berg8c0c7092009-11-25 17:46:15 +01002091 status->flag |= RX_FLAG_INTERNAL_CMTR;
Michael Wu3d30d942008-01-31 19:48:27 +01002092 return;
2093
2094 out_free_skb:
2095 dev_kfree_skb(skb);
2096}
2097
Johannes Berg571ecf62007-07-27 15:43:22 +02002098
Johannes Berg8944b792008-01-31 19:48:26 +01002099static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg5cf121c2008-02-25 16:27:43 +01002100 struct ieee80211_rx_data *rx,
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002101 struct sk_buff *skb,
2102 struct ieee80211_rate *rate)
Johannes Berg58905292008-01-31 19:48:25 +01002103{
Johannes Berg2569a822009-11-25 17:46:17 +01002104 struct sk_buff_head reorder_release;
Johannes Berg58905292008-01-31 19:48:25 +01002105 ieee80211_rx_result res = RX_DROP_MONITOR;
2106
Johannes Berg2569a822009-11-25 17:46:17 +01002107 __skb_queue_head_init(&reorder_release);
2108
Johannes Berg8944b792008-01-31 19:48:26 +01002109 rx->skb = skb;
2110 rx->sdata = sdata;
Johannes Berg8944b792008-01-31 19:48:26 +01002111
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002112#define CALL_RXH(rxh) \
2113 do { \
2114 res = rxh(rx); \
2115 if (res != RX_CONTINUE) \
Johannes Berg2569a822009-11-25 17:46:17 +01002116 goto rxh_next; \
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002117 } while (0);
Johannes Berg58905292008-01-31 19:48:25 +01002118
Johannes Berg2569a822009-11-25 17:46:17 +01002119 /*
2120 * NB: the rxh_next label works even if we jump
2121 * to it from here because then the list will
2122 * be empty, which is a trivial check
2123 */
Johannes Berg49461622008-06-30 15:10:45 +02002124 CALL_RXH(ieee80211_rx_h_passive_scan)
2125 CALL_RXH(ieee80211_rx_h_check)
Johannes Berg2569a822009-11-25 17:46:17 +01002126
2127 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2128
2129 while ((skb = __skb_dequeue(&reorder_release))) {
2130 /*
2131 * all the other fields are valid across frames
2132 * that belong to an aMPDU since they are on the
2133 * same TID from the same station
2134 */
2135 rx->skb = skb;
2136
2137 CALL_RXH(ieee80211_rx_h_decrypt)
2138 CALL_RXH(ieee80211_rx_h_check_more_data)
2139 CALL_RXH(ieee80211_rx_h_sta_process)
2140 CALL_RXH(ieee80211_rx_h_defragment)
2141 CALL_RXH(ieee80211_rx_h_ps_poll)
2142 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2143 /* must be after MMIC verify so header is counted in MPDU mic */
2144 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2145 CALL_RXH(ieee80211_rx_h_amsdu)
Ingo Molnarbf94e172008-10-12 23:51:38 -07002146#ifdef CONFIG_MAC80211_MESH
Johannes Berg2569a822009-11-25 17:46:17 +01002147 if (ieee80211_vif_is_mesh(&sdata->vif))
2148 CALL_RXH(ieee80211_rx_h_mesh_fwding);
Ingo Molnarbf94e172008-10-12 23:51:38 -07002149#endif
Johannes Berg2569a822009-11-25 17:46:17 +01002150 CALL_RXH(ieee80211_rx_h_data)
2151
2152 /* special treatment -- needs the queue */
2153 res = ieee80211_rx_h_ctrl(rx, &reorder_release);
2154 if (res != RX_CONTINUE)
2155 goto rxh_next;
2156
2157 CALL_RXH(ieee80211_rx_h_action)
2158 CALL_RXH(ieee80211_rx_h_mgmt)
Johannes Berg58905292008-01-31 19:48:25 +01002159
Johannes Berg49461622008-06-30 15:10:45 +02002160#undef CALL_RXH
2161
Johannes Berg2569a822009-11-25 17:46:17 +01002162 rxh_next:
2163 switch (res) {
2164 case RX_DROP_MONITOR:
2165 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2166 if (rx->sta)
2167 rx->sta->rx_dropped++;
2168 /* fall through */
2169 case RX_CONTINUE:
2170 ieee80211_rx_cooked_monitor(rx, rate);
2171 break;
2172 case RX_DROP_UNUSABLE:
2173 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2174 if (rx->sta)
2175 rx->sta->rx_dropped++;
2176 dev_kfree_skb(rx->skb);
2177 break;
2178 case RX_QUEUED:
2179 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2180 break;
2181 }
Johannes Berg58905292008-01-31 19:48:25 +01002182 }
2183}
2184
Johannes Berg571ecf62007-07-27 15:43:22 +02002185/* main receive path */
2186
Johannes Berg23a24de2007-07-27 15:43:22 +02002187static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg7ab17c42009-02-10 21:25:43 +01002188 struct ieee80211_rx_data *rx,
Johannes Berg23a24de2007-07-27 15:43:22 +02002189 struct ieee80211_hdr *hdr)
2190{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002191 struct sk_buff *skb = rx->skb;
2192 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2193 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02002194 int multicast = is_multicast_ether_addr(hdr->addr1);
2195
Johannes Berg51fb61e2007-12-19 01:31:27 +01002196 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02002197 case NL80211_IFTYPE_STATION:
Johannes Berg9bc383d2009-11-19 11:55:19 +01002198 if (!bssid && !sdata->u.mgd.use_4addr)
Johannes Berg23a24de2007-07-27 15:43:22 +02002199 return 0;
Johannes Berg77fdaa12009-07-07 03:45:17 +02002200 if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002201 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002202 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002203 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002204 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002205 }
2206 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002207 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02002208 if (!bssid)
2209 return 0;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002210 if (ieee80211_is_beacon(hdr->frame_control)) {
Bruno Randolf9d9bf772008-02-18 11:21:36 +09002211 return 1;
Vladimir Koutny87291c02008-06-13 16:50:44 +02002212 }
Johannes Berg46900292009-02-15 12:44:28 +01002213 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01002214 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002215 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002216 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002217 } else if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002218 compare_ether_addr(sdata->vif.addr,
Johannes Berg23a24de2007-07-27 15:43:22 +02002219 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002220 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002221 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002222 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002223 } else if (!rx->sta) {
2224 int rate_idx;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002225 if (status->flag & RX_FLAG_HT)
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002226 rate_idx = 0; /* TODO: HT rates */
2227 else
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002228 rate_idx = status->rate_idx;
Rami Rosenab1f5c02008-12-11 14:00:25 +02002229 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002230 BIT(rate_idx));
2231 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002232 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002233 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg6032f932008-02-23 15:17:07 +01002234 if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002235 compare_ether_addr(sdata->vif.addr,
Johannes Berg6032f932008-02-23 15:17:07 +01002236 hdr->addr1) != 0) {
2237 if (!(sdata->dev->flags & IFF_PROMISC))
2238 return 0;
2239
Johannes Berg5cf121c2008-02-25 16:27:43 +01002240 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg6032f932008-02-23 15:17:07 +01002241 }
2242 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002243 case NL80211_IFTYPE_AP_VLAN:
2244 case NL80211_IFTYPE_AP:
Johannes Berg23a24de2007-07-27 15:43:22 +02002245 if (!bssid) {
Johannes Berg47846c92009-11-25 17:46:19 +01002246 if (compare_ether_addr(sdata->vif.addr,
Johannes Berg23a24de2007-07-27 15:43:22 +02002247 hdr->addr1))
2248 return 0;
2249 } else if (!ieee80211_bssid_match(bssid,
Johannes Berg47846c92009-11-25 17:46:19 +01002250 sdata->vif.addr)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01002251 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002252 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002253 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002254 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002255 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002256 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07002257 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02002258 return 0;
2259 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2260 return 0;
2261 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002262 case NL80211_IFTYPE_MONITOR:
Johannes Berg05c914f2008-09-11 00:01:58 +02002263 case NL80211_IFTYPE_UNSPECIFIED:
2264 case __NL80211_IFTYPE_AFTER_LAST:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02002265 /* should never get here */
2266 WARN_ON(1);
2267 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02002268 }
2269
2270 return 1;
2271}
2272
Johannes Berg571ecf62007-07-27 15:43:22 +02002273/*
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002274 * This is the actual Rx frames handler. as it blongs to Rx path it must
2275 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02002276 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002277static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2278 struct sk_buff *skb,
Johannes Berg8318d782008-01-24 19:38:38 +01002279 struct ieee80211_rate *rate)
Johannes Berg571ecf62007-07-27 15:43:22 +02002280{
Johannes Bergf1d58c22009-06-17 13:13:00 +02002281 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002282 struct ieee80211_local *local = hw_to_local(hw);
2283 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002284 struct ieee80211_hdr *hdr;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002285 struct ieee80211_rx_data rx;
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002286 int prepares;
Johannes Berg8e6f00322007-07-27 15:43:22 +02002287 struct ieee80211_sub_if_data *prev = NULL;
2288 struct sk_buff *skb_new;
Johannes Bergabe60632009-11-25 17:46:18 +01002289 struct sta_info *sta, *tmp;
2290 bool found_sta = false;
Johannes Berg571ecf62007-07-27 15:43:22 +02002291
Harvey Harrison358c8d92008-07-15 18:44:13 -07002292 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02002293 memset(&rx, 0, sizeof(rx));
2294 rx.skb = skb;
2295 rx.local = local;
Johannes Berg72abd812007-09-17 01:29:22 -04002296
Harvey Harrison358c8d92008-07-15 18:44:13 -07002297 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
Johannes Berg571ecf62007-07-27 15:43:22 +02002298 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02002299
Helmut Schaa142b9f52009-07-23 13:18:01 +02002300 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2301 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
Johannes Berg5cf121c2008-02-25 16:27:43 +01002302 rx.flags |= IEEE80211_RX_IN_SCAN;
Johannes Berg571ecf62007-07-27 15:43:22 +02002303
Johannes Berg38f37142008-01-29 17:07:43 +01002304 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01002305 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01002306
Johannes Bergabe60632009-11-25 17:46:18 +01002307 if (ieee80211_is_data(hdr->frame_control)) {
2308 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2309 rx.sta = sta;
2310 found_sta = true;
2311 rx.sdata = sta->sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002312
Johannes Bergabe60632009-11-25 17:46:18 +01002313 rx.flags |= IEEE80211_RX_RA_MATCH;
2314 prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
2315 if (prepares) {
2316 if (status->flag & RX_FLAG_MMIC_ERROR) {
2317 if (rx.flags & IEEE80211_RX_RA_MATCH)
2318 ieee80211_rx_michael_mic_report(hdr, &rx);
2319 } else
2320 prev = rx.sdata;
2321 }
2322 }
2323 }
2324 if (!found_sta) {
2325 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01002326 if (!ieee80211_sdata_running(sdata))
Johannes Bergabe60632009-11-25 17:46:18 +01002327 continue;
2328
2329 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2330 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2331 continue;
2332
2333 rx.sta = sta_info_get(sdata, hdr->addr2);
2334
2335 rx.flags |= IEEE80211_RX_RA_MATCH;
2336 prepares = prepare_for_handlers(sdata, &rx, hdr);
2337
2338 if (!prepares)
2339 continue;
2340
Johannes Bergaf2ced62009-11-16 12:00:39 +01002341 if (status->flag & RX_FLAG_MMIC_ERROR) {
Johannes Bergabe60632009-11-25 17:46:18 +01002342 rx.sdata = sdata;
Johannes Bergaf2ced62009-11-16 12:00:39 +01002343 if (rx.flags & IEEE80211_RX_RA_MATCH)
Johannes Bergabe60632009-11-25 17:46:18 +01002344 ieee80211_rx_michael_mic_report(hdr,
2345 &rx);
2346 continue;
2347 }
Johannes Berg2a8a9a82007-08-28 17:01:52 -04002348
Johannes Bergabe60632009-11-25 17:46:18 +01002349 /*
2350 * frame is destined for this interface, but if it's
2351 * not also for the previous one we handle that after
2352 * the loop to avoid copying the SKB once too much
2353 */
Johannes Bergb2e77712007-09-26 15:19:39 +02002354
Johannes Bergabe60632009-11-25 17:46:18 +01002355 if (!prev) {
2356 prev = sdata;
2357 continue;
2358 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002359
Johannes Bergabe60632009-11-25 17:46:18 +01002360 /*
2361 * frame was destined for the previous interface
2362 * so invoke RX handlers for it
2363 */
Johannes Berg8e6f00322007-07-27 15:43:22 +02002364
Johannes Bergabe60632009-11-25 17:46:18 +01002365 skb_new = skb_copy(skb, GFP_ATOMIC);
2366 if (!skb_new) {
2367 if (net_ratelimit())
2368 printk(KERN_DEBUG "%s: failed to copy "
2369 "multicast frame for %s\n",
2370 wiphy_name(local->hw.wiphy),
Johannes Berg47846c92009-11-25 17:46:19 +01002371 prev->name);
Johannes Bergabe60632009-11-25 17:46:18 +01002372 continue;
2373 }
2374 ieee80211_invoke_rx_handlers(prev, &rx, skb_new, rate);
Johannes Berg340e11f2007-07-27 15:43:22 +02002375 prev = sdata;
Johannes Berg8e6f00322007-07-27 15:43:22 +02002376 }
Johannes Berg571ecf62007-07-27 15:43:22 +02002377 }
Harvey Harrisona4b7d7b2008-07-15 18:44:14 -07002378 if (prev)
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002379 ieee80211_invoke_rx_handlers(prev, &rx, skb, rate);
Harvey Harrisona4b7d7b2008-07-15 18:44:14 -07002380 else
Johannes Berg8e6f00322007-07-27 15:43:22 +02002381 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002382}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002383
2384/*
2385 * This is the receive path handler. It is called by a low level driver when an
2386 * 802.11 MPDU is received from the hardware.
2387 */
John W. Linville103bf9f2009-08-20 16:34:15 -04002388void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002389{
2390 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01002391 struct ieee80211_rate *rate = NULL;
2392 struct ieee80211_supported_band *sband;
Johannes Bergf1d58c22009-06-17 13:13:00 +02002393 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg8318d782008-01-24 19:38:38 +01002394
Johannes Bergd20ef632009-10-11 15:10:40 +02002395 WARN_ON_ONCE(softirq_count() == 0);
2396
Johannes Berg77a980d2009-08-24 11:46:30 +02002397 if (WARN_ON(status->band < 0 ||
2398 status->band >= IEEE80211_NUM_BANDS))
2399 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01002400
2401 sband = local->hw.wiphy->bands[status->band];
Johannes Berg77a980d2009-08-24 11:46:30 +02002402 if (WARN_ON(!sband))
2403 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01002404
Johannes Berg89c3a8a2009-07-28 18:10:17 +02002405 /*
2406 * If we're suspending, it is possible although not too likely
2407 * that we'd be receiving frames after having already partially
2408 * quiesced the stack. We can't process such frames then since
2409 * that might, for example, cause stations to be added or other
2410 * driver callbacks be invoked.
2411 */
Johannes Berg77a980d2009-08-24 11:46:30 +02002412 if (unlikely(local->quiescing || local->suspended))
2413 goto drop;
Johannes Berg89c3a8a2009-07-28 18:10:17 +02002414
Johannes Bergea77f122009-08-21 14:44:45 +02002415 /*
2416 * The same happens when we're not even started,
2417 * but that's worth a warning.
2418 */
Johannes Berg77a980d2009-08-24 11:46:30 +02002419 if (WARN_ON(!local->started))
2420 goto drop;
Johannes Bergea77f122009-08-21 14:44:45 +02002421
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002422 if (status->flag & RX_FLAG_HT) {
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05002423 /*
2424 * rate_idx is MCS index, which can be [0-76] as documented on:
2425 *
2426 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2427 *
2428 * Anything else would be some sort of driver or hardware error.
2429 * The driver should catch hardware errors.
2430 */
2431 if (WARN((status->rate_idx < 0 ||
2432 status->rate_idx > 76),
2433 "Rate marked as an HT rate but passed "
2434 "status->rate_idx is not "
2435 "an MCS index [0-76]: %d (0x%02x)\n",
2436 status->rate_idx,
2437 status->rate_idx))
Johannes Berg77a980d2009-08-24 11:46:30 +02002438 goto drop;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002439 } else {
2440 if (WARN_ON(status->rate_idx < 0 ||
2441 status->rate_idx >= sband->n_bitrates))
Johannes Berg77a980d2009-08-24 11:46:30 +02002442 goto drop;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002443 rate = &sband->bitrates[status->rate_idx];
2444 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002445
2446 /*
2447 * key references and virtual interfaces are protected using RCU
2448 * and this requires that we are in a read-side RCU section during
2449 * receive processing
2450 */
2451 rcu_read_lock();
2452
2453 /*
2454 * Frames with failed FCS/PLCP checksum are not returned,
2455 * all other frames are returned without radiotap header
2456 * if it was previously present.
2457 * Also, frames with less than 16 bytes are dropped.
2458 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002459 skb = ieee80211_rx_monitor(local, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002460 if (!skb) {
2461 rcu_read_unlock();
2462 return;
2463 }
2464
Johannes Berg2569a822009-11-25 17:46:17 +01002465 __ieee80211_rx_handle_packet(hw, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002466
2467 rcu_read_unlock();
Johannes Berg77a980d2009-08-24 11:46:30 +02002468
2469 return;
2470 drop:
2471 kfree_skb(skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002472}
John W. Linville103bf9f2009-08-20 16:34:15 -04002473EXPORT_SYMBOL(ieee80211_rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02002474
2475/* This is a version of the rx handler that can be called from hard irq
2476 * context. Post the skb on the queue and schedule the tasklet */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002477void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02002478{
2479 struct ieee80211_local *local = hw_to_local(hw);
2480
2481 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2482
Johannes Berg571ecf62007-07-27 15:43:22 +02002483 skb->pkt_type = IEEE80211_RX_MSG;
2484 skb_queue_tail(&local->skb_queue, skb);
2485 tasklet_schedule(&local->tasklet);
2486}
2487EXPORT_SYMBOL(ieee80211_rx_irqsafe);