blob: e80336f8f1ea9811230dd91af36b888be3b6b2b5 [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 Berg2c8dccc2008-04-08 15:14:40 -040022#include "led.h"
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +010023#include "mesh.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020024#include "wep.h"
25#include "wpa.h"
26#include "tkip.h"
27#include "wme.h"
28
Ron Rindjunsky71364712007-12-25 17:00:36 +020029u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
30 struct tid_ampdu_rx *tid_agg_rx,
31 struct sk_buff *skb, u16 mpdu_seq_num,
32 int bar_req);
Johannes Bergb2e77712007-09-26 15:19:39 +020033/*
34 * monitor mode reception
35 *
36 * This function cleans up the SKB, i.e. it removes all the stuff
37 * only useful for monitoring.
38 */
39static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
40 struct sk_buff *skb,
41 int rtap_len)
42{
43 skb_pull(skb, rtap_len);
44
45 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
46 if (likely(skb->len > FCS_LEN))
47 skb_trim(skb, skb->len - FCS_LEN);
48 else {
49 /* driver bug */
50 WARN_ON(1);
51 dev_kfree_skb(skb);
52 skb = NULL;
53 }
54 }
55
56 return skb;
57}
58
59static inline int should_drop_frame(struct ieee80211_rx_status *status,
60 struct sk_buff *skb,
61 int present_fcs_len,
62 int radiotap_len)
63{
64 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
65
66 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
67 return 1;
68 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
69 return 1;
Harvey Harrison87228f52008-06-11 14:21:59 -070070 if (ieee80211_is_ctl(hdr->frame_control) &&
71 !ieee80211_is_pspoll(hdr->frame_control) &&
72 !ieee80211_is_back_req(hdr->frame_control))
Johannes Bergb2e77712007-09-26 15:19:39 +020073 return 1;
74 return 0;
75}
76
Bruno Randolf601ae7f2008-05-08 19:22:43 +020077static int
78ieee80211_rx_radiotap_len(struct ieee80211_local *local,
79 struct ieee80211_rx_status *status)
80{
81 int len;
82
83 /* always present fields */
84 len = sizeof(struct ieee80211_radiotap_header) + 9;
85
86 if (status->flag & RX_FLAG_TSFT)
87 len += 8;
88 if (local->hw.flags & IEEE80211_HW_SIGNAL_DB ||
89 local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
90 len += 1;
91 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
92 len += 1;
93
94 if (len & 1) /* padding for RX_FLAGS if necessary */
95 len++;
96
97 /* make sure radiotap starts at a naturally aligned address */
98 if (len % 8)
99 len = roundup(len, 8);
100
101 return len;
102}
103
104/**
105 * ieee80211_add_rx_radiotap_header - add radiotap header
106 *
107 * add a radiotap header containing all the fields which the hardware provided.
108 */
109static void
110ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
111 struct sk_buff *skb,
112 struct ieee80211_rx_status *status,
113 struct ieee80211_rate *rate,
114 int rtap_len)
115{
116 struct ieee80211_radiotap_header *rthdr;
117 unsigned char *pos;
118
119 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
120 memset(rthdr, 0, rtap_len);
121
122 /* radiotap header, set always present flags */
123 rthdr->it_present =
124 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
125 (1 << IEEE80211_RADIOTAP_RATE) |
126 (1 << IEEE80211_RADIOTAP_CHANNEL) |
127 (1 << IEEE80211_RADIOTAP_ANTENNA) |
128 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
129 rthdr->it_len = cpu_to_le16(rtap_len);
130
131 pos = (unsigned char *)(rthdr+1);
132
133 /* the order of the following fields is important */
134
135 /* IEEE80211_RADIOTAP_TSFT */
136 if (status->flag & RX_FLAG_TSFT) {
137 *(__le64 *)pos = cpu_to_le64(status->mactime);
138 rthdr->it_present |=
139 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
140 pos += 8;
141 }
142
143 /* IEEE80211_RADIOTAP_FLAGS */
144 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
145 *pos |= IEEE80211_RADIOTAP_F_FCS;
146 pos++;
147
148 /* IEEE80211_RADIOTAP_RATE */
149 *pos = rate->bitrate / 5;
150 pos++;
151
152 /* IEEE80211_RADIOTAP_CHANNEL */
153 *(__le16 *)pos = cpu_to_le16(status->freq);
154 pos += 2;
155 if (status->band == IEEE80211_BAND_5GHZ)
156 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
157 IEEE80211_CHAN_5GHZ);
158 else
159 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_DYN |
160 IEEE80211_CHAN_2GHZ);
161 pos += 2;
162
163 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
164 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
165 *pos = status->signal;
166 rthdr->it_present |=
167 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
168 pos++;
169 }
170
171 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
172 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
173 *pos = status->noise;
174 rthdr->it_present |=
175 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
176 pos++;
177 }
178
179 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
180
181 /* IEEE80211_RADIOTAP_ANTENNA */
182 *pos = status->antenna;
183 pos++;
184
185 /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */
186 if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) {
187 *pos = status->signal;
188 rthdr->it_present |=
189 cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL);
190 pos++;
191 }
192
193 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
194
195 /* IEEE80211_RADIOTAP_RX_FLAGS */
196 /* ensure 2 byte alignment for the 2 byte field as required */
197 if ((pos - (unsigned char *)rthdr) & 1)
198 pos++;
199 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
200 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
201 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
202 pos += 2;
203}
204
Johannes Bergb2e77712007-09-26 15:19:39 +0200205/*
206 * This function copies a received frame to all monitor interfaces and
207 * returns a cleaned-up SKB that no longer includes the FCS nor the
208 * radiotap header the driver might have added.
209 */
210static struct sk_buff *
211ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
Johannes Berg8318d782008-01-24 19:38:38 +0100212 struct ieee80211_rx_status *status,
213 struct ieee80211_rate *rate)
Johannes Bergb2e77712007-09-26 15:19:39 +0200214{
215 struct ieee80211_sub_if_data *sdata;
Johannes Bergb2e77712007-09-26 15:19:39 +0200216 int needed_headroom = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200217 struct sk_buff *skb, *skb2;
218 struct net_device *prev_dev = NULL;
219 int present_fcs_len = 0;
220 int rtap_len = 0;
221
222 /*
223 * First, we may need to make a copy of the skb because
224 * (1) we need to modify it for radiotap (if not present), and
225 * (2) the other RX handlers will modify the skb we got.
226 *
227 * We don't need to, of course, if we aren't going to return
228 * the SKB because it has a bad FCS/PLCP checksum.
229 */
230 if (status->flag & RX_FLAG_RADIOTAP)
231 rtap_len = ieee80211_get_radiotap_len(origskb->data);
232 else
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200233 /* room for the radiotap header based on driver features */
234 needed_headroom = ieee80211_rx_radiotap_len(local, status);
Johannes Bergb2e77712007-09-26 15:19:39 +0200235
236 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
237 present_fcs_len = FCS_LEN;
238
239 if (!local->monitors) {
240 if (should_drop_frame(status, origskb, present_fcs_len,
241 rtap_len)) {
242 dev_kfree_skb(origskb);
243 return NULL;
244 }
245
246 return remove_monitor_info(local, origskb, rtap_len);
247 }
248
249 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
250 /* only need to expand headroom if necessary */
251 skb = origskb;
252 origskb = NULL;
253
254 /*
255 * This shouldn't trigger often because most devices have an
256 * RX header they pull before we get here, and that should
257 * be big enough for our radiotap information. We should
258 * probably export the length to drivers so that we can have
259 * them allocate enough headroom to start with.
260 */
261 if (skb_headroom(skb) < needed_headroom &&
Johannes Bergc49e5ea2007-12-11 21:33:42 +0100262 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200263 dev_kfree_skb(skb);
264 return NULL;
265 }
266 } else {
267 /*
268 * Need to make a copy and possibly remove radiotap header
269 * and FCS from the original.
270 */
271 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
272
273 origskb = remove_monitor_info(local, origskb, rtap_len);
274
275 if (!skb)
276 return origskb;
277 }
278
279 /* if necessary, prepend radiotap information */
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200280 if (!(status->flag & RX_FLAG_RADIOTAP))
281 ieee80211_add_rx_radiotap_header(local, skb, status, rate,
282 needed_headroom);
Johannes Bergb2e77712007-09-26 15:19:39 +0200283
Johannes Bergce3edf6d02007-12-19 01:31:22 +0100284 skb_reset_mac_header(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200285 skb->ip_summed = CHECKSUM_UNNECESSARY;
286 skb->pkt_type = PACKET_OTHERHOST;
287 skb->protocol = htons(ETH_P_802_2);
288
289 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
290 if (!netif_running(sdata->dev))
291 continue;
292
Johannes Berg51fb61e2007-12-19 01:31:27 +0100293 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR)
Johannes Bergb2e77712007-09-26 15:19:39 +0200294 continue;
295
Michael Wu3d30d942008-01-31 19:48:27 +0100296 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
297 continue;
298
Johannes Bergb2e77712007-09-26 15:19:39 +0200299 if (prev_dev) {
300 skb2 = skb_clone(skb, GFP_ATOMIC);
301 if (skb2) {
302 skb2->dev = prev_dev;
303 netif_rx(skb2);
304 }
305 }
306
307 prev_dev = sdata->dev;
308 sdata->dev->stats.rx_packets++;
309 sdata->dev->stats.rx_bytes += skb->len;
310 }
311
312 if (prev_dev) {
313 skb->dev = prev_dev;
314 netif_rx(skb);
315 } else
316 dev_kfree_skb(skb);
317
318 return origskb;
319}
320
321
Johannes Berg5cf121c2008-02-25 16:27:43 +0100322static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200323{
324 u8 *data = rx->skb->data;
325 int tid;
326
327 /* does the frame have a qos control field? */
328 if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
329 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
330 /* frame has qos control */
331 tid = qc[0] & QOS_CONTROL_TID_MASK;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +0200332 if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
Johannes Berg5cf121c2008-02-25 16:27:43 +0100333 rx->flags |= IEEE80211_RX_AMSDU;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +0200334 else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100335 rx->flags &= ~IEEE80211_RX_AMSDU;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200336 } else {
337 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
338 /* Separate TID for management frames */
339 tid = NUM_RX_DATA_QUEUES - 1;
340 } else {
341 /* no qos control present */
342 tid = 0; /* 802.1d - Best Effort */
343 }
344 }
Johannes Berg52865df2007-07-27 15:43:22 +0200345
Johannes Berg5cf121c2008-02-25 16:27:43 +0100346 rx->queue = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200347 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
348 * For now, set skb->priority to 0 for other cases. */
349 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100350}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200351
Johannes Berg5cf121c2008-02-25 16:27:43 +0100352static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx)
Johannes Berg38f37142008-01-29 17:07:43 +0100353{
354#ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
355 int hdrlen;
356
357 if (!WLAN_FC_DATA_PRESENT(rx->fc))
358 return;
359
360 /*
361 * Drivers are required to align the payload data in a way that
362 * guarantees that the contained IP header is aligned to a four-
363 * byte boundary. In the case of regular frames, this simply means
364 * aligning the payload to a four-byte boundary (because either
365 * the IP header is directly contained, or IV/RFC1042 headers that
366 * have a length divisible by four are in front of it.
367 *
368 * With A-MSDU frames, however, the payload data address must
369 * yield two modulo four because there are 14-byte 802.3 headers
370 * within the A-MSDU frames that push the IP header further back
371 * to a multiple of four again. Thankfully, the specs were sane
372 * enough this time around to require padding each A-MSDU subframe
373 * to a length that is a multiple of four.
374 *
375 * Padding like atheros hardware adds which is inbetween the 802.11
376 * header and the payload is not supported, the driver is required
377 * to move the 802.11 header further back in that case.
378 */
379 hdrlen = ieee80211_get_hdrlen(rx->fc);
Johannes Berg5cf121c2008-02-25 16:27:43 +0100380 if (rx->flags & IEEE80211_RX_AMSDU)
Johannes Berg38f37142008-01-29 17:07:43 +0100381 hdrlen += ETH_HLEN;
382 WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
383#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 Berg9ae54c82008-01-31 19:48:20 +0100389static ieee80211_rx_result
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
Zhu Yiece8edd2007-11-22 10:53:21 +0800395 if (unlikely(local->sta_hw_scanning))
Johannes Berg5cf121c2008-02-25 16:27:43 +0100396 return ieee80211_sta_rx_scan(rx->dev, skb, rx->status);
Zhu Yiece8edd2007-11-22 10:53:21 +0800397
398 if (unlikely(local->sta_sw_scanning)) {
399 /* drop all the other packets during a software scan anyway */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100400 if (ieee80211_sta_rx_scan(rx->dev, skb, rx->status)
Johannes Berg9ae54c82008-01-31 19:48:20 +0100401 != 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
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100415static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100416ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100417{
418 int hdrlen = ieee80211_get_hdrlen(rx->fc);
419 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100420
421#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
422
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100423 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) {
424 if (!((rx->fc & IEEE80211_FCTL_FROMDS) &&
425 (rx->fc & IEEE80211_FCTL_TODS)))
426 return RX_DROP_MONITOR;
427 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
428 return RX_DROP_MONITOR;
429 }
430
431 /* If there is not an established peer link and this is not a peer link
432 * establisment frame, beacon or probe, drop the frame.
433 */
434
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800435 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100436 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100437
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100438 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT)
439 return RX_DROP_MONITOR;
440
441 switch (rx->fc & IEEE80211_FCTL_STYPE) {
442 case IEEE80211_STYPE_ACTION:
443 mgmt = (struct ieee80211_mgmt *)hdr;
444 if (mgmt->u.action.category != PLINK_CATEGORY)
445 return RX_DROP_MONITOR;
446 /* fall through on else */
447 case IEEE80211_STYPE_PROBE_REQ:
448 case IEEE80211_STYPE_PROBE_RESP:
449 case IEEE80211_STYPE_BEACON:
450 return RX_CONTINUE;
451 break;
452 default:
453 return RX_DROP_MONITOR;
454 }
455
456 } else if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
Luis Carlos Cobo966a5422008-03-31 15:33:39 -0700457 is_multicast_ether_addr(hdr->addr1) &&
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100458 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->dev))
459 return RX_DROP_MONITOR;
Johannes Berg902acc72008-02-23 15:17:19 +0100460#undef msh_h_get
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100461
Johannes Berg902acc72008-02-23 15:17:19 +0100462 return RX_CONTINUE;
463}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100464
465
Johannes Berg9ae54c82008-01-31 19:48:20 +0100466static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100467ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200468{
469 struct ieee80211_hdr *hdr;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100470
Johannes Berg571ecf62007-07-27 15:43:22 +0200471 hdr = (struct ieee80211_hdr *) rx->skb->data;
472
473 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
474 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
475 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100476 rx->sta->last_seq_ctrl[rx->queue] ==
Johannes Berg571ecf62007-07-27 15:43:22 +0200477 hdr->seq_ctrl)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +0100478 if (rx->flags & IEEE80211_RX_RA_MATCH) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200479 rx->local->dot11FrameDuplicateCount++;
480 rx->sta->num_duplicates++;
481 }
Johannes Berge4c26ad2008-01-31 19:48:21 +0100482 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200483 } else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100484 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +0200485 }
486
Johannes Berg571ecf62007-07-27 15:43:22 +0200487 if (unlikely(rx->skb->len < 16)) {
488 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100489 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200490 }
491
Johannes Berg571ecf62007-07-27 15:43:22 +0200492 /* Drop disallowed frame classes based on STA auth/assoc state;
493 * IEEE 802.11, Chap 5.5.
494 *
495 * 80211.o does filtering only based on association state, i.e., it
496 * drops Class 3 frames from not associated stations. hostapd sends
497 * deauth/disassoc frames when needed. In addition, hostapd is
498 * responsible for filtering on both auth and assoc states.
499 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100500
Johannes Berg902acc72008-02-23 15:17:19 +0100501 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100502 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100503
Johannes Berg571ecf62007-07-27 15:43:22 +0200504 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
505 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
506 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
Johannes Berg51fb61e2007-12-19 01:31:27 +0100507 rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
Johannes Berg07346f812008-05-03 01:02:02 +0200508 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200509 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
510 !(rx->fc & IEEE80211_FCTL_TODS) &&
511 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
Johannes Berg5cf121c2008-02-25 16:27:43 +0100512 || !(rx->flags & IEEE80211_RX_RA_MATCH)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200513 /* Drop IBSS frames and frames for other hosts
514 * silently. */
Johannes Berge4c26ad2008-01-31 19:48:21 +0100515 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200516 }
517
Johannes Berge4c26ad2008-01-31 19:48:21 +0100518 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200519 }
520
Johannes Berg9ae54c82008-01-31 19:48:20 +0100521 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +0200522}
523
524
Johannes Berg9ae54c82008-01-31 19:48:20 +0100525static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100526ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
Johannes Berg570bd532007-07-27 15:43:22 +0200527{
528 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
Johannes Berg3017b802007-08-28 17:01:53 -0400529 int keyidx;
530 int hdrlen;
Johannes Berge4c26ad2008-01-31 19:48:21 +0100531 ieee80211_rx_result result = RX_DROP_UNUSABLE;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400532 struct ieee80211_key *stakey = NULL;
Johannes Berg570bd532007-07-27 15:43:22 +0200533
Johannes Berg3017b802007-08-28 17:01:53 -0400534 /*
535 * Key selection 101
536 *
537 * There are three types of keys:
538 * - GTK (group keys)
539 * - PTK (pairwise keys)
540 * - STK (station-to-station pairwise keys)
541 *
542 * When selecting a key, we have to distinguish between multicast
543 * (including broadcast) and unicast frames, the latter can only
544 * use PTKs and STKs while the former always use GTKs. Unless, of
545 * course, actual WEP keys ("pre-RSNA") are used, then unicast
546 * frames can also use key indizes like GTKs. Hence, if we don't
547 * have a PTK/STK we check the key index for a WEP key.
548 *
Johannes Berg8dc06a12007-08-28 17:01:55 -0400549 * Note that in a regular BSS, multicast frames are sent by the
550 * AP only, associated stations unicast the frame to the AP first
551 * which then multicasts it on their behalf.
552 *
Johannes Berg3017b802007-08-28 17:01:53 -0400553 * There is also a slight problem in IBSS mode: GTKs are negotiated
554 * with each station, that is something we don't currently handle.
Johannes Berg8dc06a12007-08-28 17:01:55 -0400555 * The spec seems to expect that one negotiates the same key with
556 * every station but there's no such requirement; VLANs could be
557 * possible.
Johannes Berg3017b802007-08-28 17:01:53 -0400558 */
Johannes Berg571ecf62007-07-27 15:43:22 +0200559
Johannes Berg3017b802007-08-28 17:01:53 -0400560 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100561 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -0400562
563 /*
Johannes Berg1990af82007-09-26 17:53:15 +0200564 * No point in finding a key and decrypting if the frame is neither
Johannes Berg3017b802007-08-28 17:01:53 -0400565 * addressed to us nor a multicast frame.
566 */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100567 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100568 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -0400569
Johannes Bergd4e46a32007-09-14 11:10:24 -0400570 if (rx->sta)
571 stakey = rcu_dereference(rx->sta->key);
572
573 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
574 rx->key = stakey;
Johannes Berg571ecf62007-07-27 15:43:22 +0200575 } else {
Johannes Berg3017b802007-08-28 17:01:53 -0400576 /*
577 * The device doesn't give us the IV so we won't be
578 * able to look up the key. That's ok though, we
579 * don't need to decrypt the frame, we just won't
580 * be able to keep statistics accurate.
581 * Except for key threshold notifications, should
582 * we somehow allow the driver to tell us which key
583 * the hardware used if this flag is set?
584 */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100585 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
586 (rx->status->flag & RX_FLAG_IV_STRIPPED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100587 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200588
Johannes Berg3017b802007-08-28 17:01:53 -0400589 hdrlen = ieee80211_get_hdrlen(rx->fc);
Johannes Berg571ecf62007-07-27 15:43:22 +0200590
Johannes Berg3017b802007-08-28 17:01:53 -0400591 if (rx->skb->len < 8 + hdrlen)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100592 return RX_DROP_UNUSABLE; /* TODO: count this? */
Johannes Berg571ecf62007-07-27 15:43:22 +0200593
Johannes Berg3017b802007-08-28 17:01:53 -0400594 /*
595 * no need to call ieee80211_wep_get_keyidx,
596 * it verifies a bunch of things we've done already
597 */
598 keyidx = rx->skb->data[hdrlen + 3] >> 6;
599
Johannes Bergd4e46a32007-09-14 11:10:24 -0400600 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
Johannes Berg3017b802007-08-28 17:01:53 -0400601
602 /*
603 * RSNA-protected unicast frames should always be sent with
604 * pairwise or station-to-station keys, but for WEP we allow
605 * using a key index as well.
606 */
Johannes Berg8f20fc22007-08-28 17:01:54 -0400607 if (rx->key && rx->key->conf.alg != ALG_WEP &&
Johannes Berg3017b802007-08-28 17:01:53 -0400608 !is_multicast_ether_addr(hdr->addr1))
609 rx->key = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +0200610 }
611
Johannes Berg3017b802007-08-28 17:01:53 -0400612 if (rx->key) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200613 rx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -0400614 /* TODO: add threshold stuff again */
Johannes Berg1990af82007-09-26 17:53:15 +0200615 } else {
John W. Linville7f3ad892007-11-06 17:12:31 -0500616#ifdef CONFIG_MAC80211_DEBUG
Johannes Berg70f08762007-09-26 17:53:14 +0200617 if (net_ratelimit())
618 printk(KERN_DEBUG "%s: RX protected frame,"
619 " but have no key\n", rx->dev->name);
John W. Linville7f3ad892007-11-06 17:12:31 -0500620#endif /* CONFIG_MAC80211_DEBUG */
Johannes Berge4c26ad2008-01-31 19:48:21 +0100621 return RX_DROP_MONITOR;
Johannes Berg70f08762007-09-26 17:53:14 +0200622 }
623
Johannes Berg1990af82007-09-26 17:53:15 +0200624 /* Check for weak IVs if possible */
625 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
626 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100627 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
628 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
Johannes Berg1990af82007-09-26 17:53:15 +0200629 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
630 rx->sta->wep_weak_iv_count++;
631
Johannes Berg70f08762007-09-26 17:53:14 +0200632 switch (rx->key->conf.alg) {
633 case ALG_WEP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200634 result = ieee80211_crypto_wep_decrypt(rx);
635 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200636 case ALG_TKIP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200637 result = ieee80211_crypto_tkip_decrypt(rx);
638 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200639 case ALG_CCMP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200640 result = ieee80211_crypto_ccmp_decrypt(rx);
641 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200642 }
643
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200644 /* either the frame has been decrypted or will be dropped */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100645 rx->status->flag |= RX_FLAG_DECRYPTED;
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200646
647 return result;
Johannes Berg70f08762007-09-26 17:53:14 +0200648}
649
Johannes Berg571ecf62007-07-27 15:43:22 +0200650static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
651{
652 struct ieee80211_sub_if_data *sdata;
Joe Perches0795af52007-10-03 17:59:30 -0700653 DECLARE_MAC_BUF(mac);
654
Johannes Bergd0709a62008-02-25 16:27:46 +0100655 sdata = sta->sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +0200656
657 if (sdata->bss)
658 atomic_inc(&sdata->bss->num_sta_ps);
Johannes Berg07346f812008-05-03 01:02:02 +0200659 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
Johannes Berg571ecf62007-07-27 15:43:22 +0200660#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700661 printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
662 dev->name, print_mac(mac, sta->addr), sta->aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200663#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
664}
665
666static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
667{
668 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
669 struct sk_buff *skb;
670 int sent = 0;
671 struct ieee80211_sub_if_data *sdata;
Johannes Berge039fa42008-05-15 12:55:29 +0200672 struct ieee80211_tx_info *info;
Joe Perches0795af52007-10-03 17:59:30 -0700673 DECLARE_MAC_BUF(mac);
Johannes Berg571ecf62007-07-27 15:43:22 +0200674
Johannes Bergd0709a62008-02-25 16:27:46 +0100675 sdata = sta->sdata;
Johannes Berg004c8722008-02-20 11:21:35 +0100676
Johannes Berg571ecf62007-07-27 15:43:22 +0200677 if (sdata->bss)
678 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg004c8722008-02-20 11:21:35 +0100679
Johannes Berg07346f812008-05-03 01:02:02 +0200680 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
Johannes Berg004c8722008-02-20 11:21:35 +0100681
682 if (!skb_queue_empty(&sta->ps_tx_buf))
683 sta_info_clear_tim_bit(sta);
684
Johannes Berg571ecf62007-07-27 15:43:22 +0200685#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700686 printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
687 dev->name, print_mac(mac, sta->addr), sta->aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200688#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg004c8722008-02-20 11:21:35 +0100689
Johannes Berg571ecf62007-07-27 15:43:22 +0200690 /* Send all buffered frames to the station */
691 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
Johannes Berge039fa42008-05-15 12:55:29 +0200692 info = IEEE80211_SKB_CB(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200693 sent++;
Johannes Berge039fa42008-05-15 12:55:29 +0200694 info->flags |= IEEE80211_TX_CTL_REQUEUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200695 dev_queue_xmit(skb);
696 }
697 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
Johannes Berge039fa42008-05-15 12:55:29 +0200698 info = IEEE80211_SKB_CB(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +0200699 local->total_ps_buffered--;
700 sent++;
701#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700702 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
Johannes Berg571ecf62007-07-27 15:43:22 +0200703 "since STA not sleeping anymore\n", dev->name,
Joe Perches0795af52007-10-03 17:59:30 -0700704 print_mac(mac, sta->addr), sta->aid);
Johannes Berg571ecf62007-07-27 15:43:22 +0200705#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berge039fa42008-05-15 12:55:29 +0200706 info->flags |= IEEE80211_TX_CTL_REQUEUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200707 dev_queue_xmit(skb);
708 }
709
710 return sent;
711}
712
Johannes Berg9ae54c82008-01-31 19:48:20 +0100713static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100714ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200715{
716 struct sta_info *sta = rx->sta;
717 struct net_device *dev = rx->dev;
718 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
719
720 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +0100721 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200722
723 /* Update last_rx only for IBSS packets which are for the current
724 * BSSID to avoid keeping the current IBSS network alive in cases where
725 * other STAs are using different BSSID. */
Johannes Berg51fb61e2007-12-19 01:31:27 +0100726 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
Ron Rindjunsky71364712007-12-25 17:00:36 +0200727 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
728 IEEE80211_IF_TYPE_IBSS);
Johannes Berg571ecf62007-07-27 15:43:22 +0200729 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
730 sta->last_rx = jiffies;
731 } else
732 if (!is_multicast_ether_addr(hdr->addr1) ||
Johannes Berg51fb61e2007-12-19 01:31:27 +0100733 rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200734 /* Update last_rx only for unicast frames in order to prevent
735 * the Probe Request frames (the only broadcast frames from a
736 * STA in infrastructure mode) from keeping a connection alive.
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100737 * Mesh beacons will update last_rx when if they are found to
738 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +0200739 */
740 sta->last_rx = jiffies;
741 }
742
Johannes Berg5cf121c2008-02-25 16:27:43 +0100743 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100744 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200745
746 sta->rx_fragments++;
747 sta->rx_bytes += rx->skb->len;
Johannes Berg5cf121c2008-02-25 16:27:43 +0100748 sta->last_signal = rx->status->signal;
Bruno Randolf566bfe52008-05-08 19:15:40 +0200749 sta->last_qual = rx->status->qual;
Johannes Berg5cf121c2008-02-25 16:27:43 +0100750 sta->last_noise = rx->status->noise;
Johannes Berg571ecf62007-07-27 15:43:22 +0200751
752 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
753 /* Change STA power saving mode only in the end of a frame
754 * exchange sequence */
Johannes Berg07346f812008-05-03 01:02:02 +0200755 if (test_sta_flags(sta, WLAN_STA_PS) &&
756 !(rx->fc & IEEE80211_FCTL_PM))
Johannes Berg5cf121c2008-02-25 16:27:43 +0100757 rx->sent_ps_buffered += ap_sta_ps_end(dev, sta);
Johannes Berg07346f812008-05-03 01:02:02 +0200758 else if (!test_sta_flags(sta, WLAN_STA_PS) &&
Johannes Berg571ecf62007-07-27 15:43:22 +0200759 (rx->fc & IEEE80211_FCTL_PM))
760 ap_sta_ps_start(dev, sta);
761 }
762
763 /* Drop data::nullfunc frames silently, since they are used only to
764 * control station power saving mode. */
765 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
766 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
767 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
768 /* Update counter and free packet here to avoid counting this
769 * as a dropped packed. */
770 sta->rx_packets++;
771 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100772 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200773 }
774
Johannes Berg9ae54c82008-01-31 19:48:20 +0100775 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200776} /* ieee80211_rx_h_sta_process */
777
Johannes Berg571ecf62007-07-27 15:43:22 +0200778static inline struct ieee80211_fragment_entry *
779ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
780 unsigned int frag, unsigned int seq, int rx_queue,
781 struct sk_buff **skb)
782{
783 struct ieee80211_fragment_entry *entry;
784 int idx;
785
786 idx = sdata->fragment_next;
787 entry = &sdata->fragments[sdata->fragment_next++];
788 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
789 sdata->fragment_next = 0;
790
791 if (!skb_queue_empty(&entry->skb_list)) {
792#ifdef CONFIG_MAC80211_DEBUG
793 struct ieee80211_hdr *hdr =
794 (struct ieee80211_hdr *) entry->skb_list.next->data;
Joe Perches0795af52007-10-03 17:59:30 -0700795 DECLARE_MAC_BUF(mac);
796 DECLARE_MAC_BUF(mac2);
Johannes Berg571ecf62007-07-27 15:43:22 +0200797 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
798 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
Joe Perches0795af52007-10-03 17:59:30 -0700799 "addr1=%s addr2=%s\n",
Johannes Berg571ecf62007-07-27 15:43:22 +0200800 sdata->dev->name, idx,
801 jiffies - entry->first_frag_time, entry->seq,
Joe Perches0795af52007-10-03 17:59:30 -0700802 entry->last_frag, print_mac(mac, hdr->addr1),
803 print_mac(mac2, hdr->addr2));
Johannes Berg571ecf62007-07-27 15:43:22 +0200804#endif /* CONFIG_MAC80211_DEBUG */
805 __skb_queue_purge(&entry->skb_list);
806 }
807
808 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
809 *skb = NULL;
810 entry->first_frag_time = jiffies;
811 entry->seq = seq;
812 entry->rx_queue = rx_queue;
813 entry->last_frag = frag;
814 entry->ccmp = 0;
815 entry->extra_len = 0;
816
817 return entry;
818}
819
820static inline struct ieee80211_fragment_entry *
821ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
822 u16 fc, unsigned int frag, unsigned int seq,
823 int rx_queue, struct ieee80211_hdr *hdr)
824{
825 struct ieee80211_fragment_entry *entry;
826 int i, idx;
827
828 idx = sdata->fragment_next;
829 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
830 struct ieee80211_hdr *f_hdr;
831 u16 f_fc;
832
833 idx--;
834 if (idx < 0)
835 idx = IEEE80211_FRAGMENT_MAX - 1;
836
837 entry = &sdata->fragments[idx];
838 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
839 entry->rx_queue != rx_queue ||
840 entry->last_frag + 1 != frag)
841 continue;
842
843 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
844 f_fc = le16_to_cpu(f_hdr->frame_control);
845
846 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
847 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
848 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
849 continue;
850
S.Çağlar Onurab466232008-02-14 17:36:47 +0200851 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200852 __skb_queue_purge(&entry->skb_list);
853 continue;
854 }
855 return entry;
856 }
857
858 return NULL;
859}
860
Johannes Berg9ae54c82008-01-31 19:48:20 +0100861static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100862ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200863{
864 struct ieee80211_hdr *hdr;
865 u16 sc;
866 unsigned int frag, seq;
867 struct ieee80211_fragment_entry *entry;
868 struct sk_buff *skb;
Joe Perches0795af52007-10-03 17:59:30 -0700869 DECLARE_MAC_BUF(mac);
Johannes Berg571ecf62007-07-27 15:43:22 +0200870
871 hdr = (struct ieee80211_hdr *) rx->skb->data;
872 sc = le16_to_cpu(hdr->seq_ctrl);
873 frag = sc & IEEE80211_SCTL_FRAG;
874
875 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
876 (rx->skb)->len < 24 ||
877 is_multicast_ether_addr(hdr->addr1))) {
878 /* not fragmented */
879 goto out;
880 }
881 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
882
883 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
884
885 if (frag == 0) {
886 /* This is the first fragment of a new frame. */
887 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg5cf121c2008-02-25 16:27:43 +0100888 rx->queue, &(rx->skb));
Johannes Berg8f20fc22007-08-28 17:01:54 -0400889 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
Johannes Berg571ecf62007-07-27 15:43:22 +0200890 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
891 /* Store CCMP PN so that we can verify that the next
892 * fragment has a sequential PN value. */
893 entry->ccmp = 1;
894 memcpy(entry->last_pn,
Johannes Berg5cf121c2008-02-25 16:27:43 +0100895 rx->key->u.ccmp.rx_pn[rx->queue],
Johannes Berg571ecf62007-07-27 15:43:22 +0200896 CCMP_PN_LEN);
897 }
Johannes Berg9ae54c82008-01-31 19:48:20 +0100898 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200899 }
900
901 /* This is a fragment for a frame that should already be pending in
902 * fragment cache. Add this fragment to the end of the pending entry.
903 */
904 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
Johannes Berg5cf121c2008-02-25 16:27:43 +0100905 rx->queue, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +0200906 if (!entry) {
907 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100908 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200909 }
910
911 /* Verify that MPDUs within one MSDU have sequential PN values.
912 * (IEEE 802.11i, 8.3.3.4.5) */
913 if (entry->ccmp) {
914 int i;
915 u8 pn[CCMP_PN_LEN], *rpn;
Johannes Berg8f20fc22007-08-28 17:01:54 -0400916 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100917 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200918 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
919 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
920 pn[i]++;
921 if (pn[i])
922 break;
923 }
Johannes Berg5cf121c2008-02-25 16:27:43 +0100924 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
Johannes Berg571ecf62007-07-27 15:43:22 +0200925 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
Johannes Berg1a84f3f2007-08-28 17:01:52 -0400926 if (net_ratelimit())
927 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
Joe Perches0795af52007-10-03 17:59:30 -0700928 "sequential A2=%s"
Johannes Berg1a84f3f2007-08-28 17:01:52 -0400929 " PN=%02x%02x%02x%02x%02x%02x "
930 "(expected %02x%02x%02x%02x%02x%02x)\n",
Joe Perches0795af52007-10-03 17:59:30 -0700931 rx->dev->name, print_mac(mac, hdr->addr2),
Johannes Berg1a84f3f2007-08-28 17:01:52 -0400932 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
933 rpn[5], pn[0], pn[1], pn[2], pn[3],
934 pn[4], pn[5]);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100935 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200936 }
937 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
938 }
939
940 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
941 __skb_queue_tail(&entry->skb_list, rx->skb);
942 entry->last_frag = frag;
943 entry->extra_len += rx->skb->len;
944 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
945 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +0100946 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200947 }
948
949 rx->skb = __skb_dequeue(&entry->skb_list);
950 if (skb_tailroom(rx->skb) < entry->extra_len) {
951 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
952 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
953 GFP_ATOMIC))) {
954 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
955 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100956 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200957 }
958 }
959 while ((skb = __skb_dequeue(&entry->skb_list))) {
960 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
961 dev_kfree_skb(skb);
962 }
963
964 /* Complete frame has been reassembled - process it now */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100965 rx->flags |= IEEE80211_RX_FRAGMENTED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200966
967 out:
968 if (rx->sta)
969 rx->sta->rx_packets++;
970 if (is_multicast_ether_addr(hdr->addr1))
971 rx->local->dot11MulticastReceivedFrameCount++;
972 else
973 ieee80211_led_rx(rx->local);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100974 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200975}
976
Johannes Berg9ae54c82008-01-31 19:48:20 +0100977static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100978ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200979{
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +0200980 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
Johannes Berg571ecf62007-07-27 15:43:22 +0200981 struct sk_buff *skb;
982 int no_pending_pkts;
Joe Perches0795af52007-10-03 17:59:30 -0700983 DECLARE_MAC_BUF(mac);
Johannes Berg571ecf62007-07-27 15:43:22 +0200984
985 if (likely(!rx->sta ||
986 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
987 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
Johannes Berg5cf121c2008-02-25 16:27:43 +0100988 !(rx->flags & IEEE80211_RX_RA_MATCH)))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100989 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200990
Johannes Berg51fb61e2007-12-19 01:31:27 +0100991 if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
992 (sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
Johannes Berge4c26ad2008-01-31 19:48:21 +0100993 return RX_DROP_UNUSABLE;
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +0200994
Johannes Berg571ecf62007-07-27 15:43:22 +0200995 skb = skb_dequeue(&rx->sta->tx_filtered);
996 if (!skb) {
997 skb = skb_dequeue(&rx->sta->ps_tx_buf);
998 if (skb)
999 rx->local->total_ps_buffered--;
1000 }
1001 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1002 skb_queue_empty(&rx->sta->ps_tx_buf);
1003
1004 if (skb) {
1005 struct ieee80211_hdr *hdr =
1006 (struct ieee80211_hdr *) skb->data;
1007
Johannes Berg4a9a66e2008-02-19 11:31:14 +01001008 /*
1009 * Tell TX path to send one frame even though the STA may
1010 * still remain is PS mode after this frame exchange.
1011 */
Johannes Berg07346f812008-05-03 01:02:02 +02001012 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
Johannes Berg571ecf62007-07-27 15:43:22 +02001013
1014#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -07001015 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
1016 print_mac(mac, rx->sta->addr), rx->sta->aid,
Johannes Berg571ecf62007-07-27 15:43:22 +02001017 skb_queue_len(&rx->sta->ps_tx_buf));
1018#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1019
1020 /* Use MoreData flag to indicate whether there are more
1021 * buffered frames for this STA */
Johannes Berg836341a2008-02-20 02:07:21 +01001022 if (no_pending_pkts)
Johannes Berg571ecf62007-07-27 15:43:22 +02001023 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
Johannes Berg836341a2008-02-20 02:07:21 +01001024 else
Johannes Berg571ecf62007-07-27 15:43:22 +02001025 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1026
1027 dev_queue_xmit(skb);
1028
Johannes Berg004c8722008-02-20 11:21:35 +01001029 if (no_pending_pkts)
1030 sta_info_clear_tim_bit(rx->sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001031#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg5cf121c2008-02-25 16:27:43 +01001032 } else if (!rx->sent_ps_buffered) {
Johannes Berg004c8722008-02-20 11:21:35 +01001033 /*
1034 * FIXME: This can be the result of a race condition between
1035 * us expiring a frame and the station polling for it.
1036 * Should we send it a null-func frame indicating we
1037 * have nothing buffered for it?
1038 */
Joe Perches0795af52007-10-03 17:59:30 -07001039 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
Johannes Berg571ecf62007-07-27 15:43:22 +02001040 "though there is no buffered frames for it\n",
Joe Perches0795af52007-10-03 17:59:30 -07001041 rx->dev->name, print_mac(mac, rx->sta->addr));
Johannes Berg571ecf62007-07-27 15:43:22 +02001042#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg571ecf62007-07-27 15:43:22 +02001043 }
1044
Johannes Berg9ae54c82008-01-31 19:48:20 +01001045 /* Free PS Poll skb here instead of returning RX_DROP that would
Johannes Berg571ecf62007-07-27 15:43:22 +02001046 * count as an dropped frame. */
1047 dev_kfree_skb(rx->skb);
1048
Johannes Berg9ae54c82008-01-31 19:48:20 +01001049 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001050}
1051
Johannes Berg9ae54c82008-01-31 19:48:20 +01001052static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +01001053ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +02001054{
1055 u16 fc = rx->fc;
1056 u8 *data = rx->skb->data;
1057 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
1058
1059 if (!WLAN_FC_IS_QOS_DATA(fc))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001060 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001061
1062 /* remove the qos control field, update frame type and meta-data */
1063 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
1064 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
1065 /* change frame type to non QOS */
1066 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
1067 hdr->frame_control = cpu_to_le16(fc);
1068
Johannes Berg9ae54c82008-01-31 19:48:20 +01001069 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001070}
1071
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001072static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001073ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001074{
Johannes Berg07346f812008-05-03 01:02:02 +02001075 if (unlikely(!rx->sta ||
1076 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001077#ifdef CONFIG_MAC80211_DEBUG
Johannes Berg238814f2008-01-28 17:19:37 +01001078 if (net_ratelimit())
1079 printk(KERN_DEBUG "%s: dropped frame "
1080 "(unauthorized port)\n", rx->dev->name);
Johannes Berg571ecf62007-07-27 15:43:22 +02001081#endif /* CONFIG_MAC80211_DEBUG */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001082 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001083 }
1084
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001085 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001086}
1087
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001088static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001089ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001090{
Johannes Berg3017b802007-08-28 17:01:53 -04001091 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001092 * Pass through unencrypted frames if the hardware has
1093 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001094 */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001095 if (rx->status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001096 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001097
1098 /* Drop unencrypted frames if key is set. */
1099 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
1100 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
1101 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001102 (rx->key || rx->sdata->drop_unencrypted)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001103 return -EACCES;
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001104
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001105 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001106}
1107
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001108static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001109ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001110{
1111 struct net_device *dev = rx->dev;
Johannes Berg571ecf62007-07-27 15:43:22 +02001112 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1113 u16 fc, hdrlen, ethertype;
1114 u8 *payload;
1115 u8 dst[ETH_ALEN];
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301116 u8 src[ETH_ALEN] __aligned(2);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001117 struct sk_buff *skb = rx->skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001118 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Joe Perches0795af52007-10-03 17:59:30 -07001119 DECLARE_MAC_BUF(mac);
1120 DECLARE_MAC_BUF(mac2);
1121 DECLARE_MAC_BUF(mac3);
1122 DECLARE_MAC_BUF(mac4);
Johannes Berg571ecf62007-07-27 15:43:22 +02001123
1124 fc = rx->fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001125
1126 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001127 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001128
1129 hdrlen = ieee80211_get_hdrlen(fc);
1130
Johannes Berg902acc72008-02-23 15:17:19 +01001131 if (ieee80211_vif_is_mesh(&sdata->vif)) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001132 int meshhdrlen = ieee80211_get_mesh_hdrlen(
1133 (struct ieee80211s_hdr *) (skb->data + hdrlen));
1134 /* Copy on cb:
1135 * - mesh header: to be used for mesh forwarding
1136 * decision. It will also be used as mesh header template at
1137 * tx.c:ieee80211_subif_start_xmit() if interface
1138 * type is mesh and skb->pkt_type == PACKET_OTHERHOST
1139 * - ta: to be used if a RERR needs to be sent.
1140 */
1141 memcpy(skb->cb, skb->data + hdrlen, meshhdrlen);
1142 memcpy(MESH_PREQ(skb), hdr->addr2, ETH_ALEN);
1143 hdrlen += meshhdrlen;
1144 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001145
Johannes Berg571ecf62007-07-27 15:43:22 +02001146 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1147 * header
1148 * IEEE 802.11 address fields:
1149 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1150 * 0 0 DA SA BSSID n/a
1151 * 0 1 DA BSSID SA n/a
1152 * 1 0 BSSID SA DA n/a
1153 * 1 1 RA TA DA SA
1154 */
1155
1156 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1157 case IEEE80211_FCTL_TODS:
1158 /* BSSID SA DA */
1159 memcpy(dst, hdr->addr3, ETH_ALEN);
1160 memcpy(src, hdr->addr2, ETH_ALEN);
1161
Johannes Berg51fb61e2007-12-19 01:31:27 +01001162 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP &&
1163 sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) {
Johannes Berg1a84f3f2007-08-28 17:01:52 -04001164 if (net_ratelimit())
1165 printk(KERN_DEBUG "%s: dropped ToDS frame "
Joe Perches0795af52007-10-03 17:59:30 -07001166 "(BSSID=%s SA=%s DA=%s)\n",
Johannes Berg1a84f3f2007-08-28 17:01:52 -04001167 dev->name,
Joe Perches0795af52007-10-03 17:59:30 -07001168 print_mac(mac, hdr->addr1),
1169 print_mac(mac2, hdr->addr2),
1170 print_mac(mac3, hdr->addr3));
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001171 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001172 }
1173 break;
1174 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1175 /* RA TA DA SA */
1176 memcpy(dst, hdr->addr3, ETH_ALEN);
1177 memcpy(src, hdr->addr4, ETH_ALEN);
1178
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001179 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS &&
1180 sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT)) {
1181 if (net_ratelimit())
1182 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
Joe Perches0795af52007-10-03 17:59:30 -07001183 "frame (RA=%s TA=%s DA=%s SA=%s)\n",
Johannes Berg1a84f3f2007-08-28 17:01:52 -04001184 rx->dev->name,
Joe Perches0795af52007-10-03 17:59:30 -07001185 print_mac(mac, hdr->addr1),
1186 print_mac(mac2, hdr->addr2),
1187 print_mac(mac3, hdr->addr3),
1188 print_mac(mac4, hdr->addr4));
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001189 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001190 }
1191 break;
1192 case IEEE80211_FCTL_FROMDS:
1193 /* DA BSSID SA */
1194 memcpy(dst, hdr->addr1, ETH_ALEN);
1195 memcpy(src, hdr->addr3, ETH_ALEN);
1196
Johannes Berg51fb61e2007-12-19 01:31:27 +01001197 if (sdata->vif.type != IEEE80211_IF_TYPE_STA ||
John W. Linvilleb3316152007-08-28 17:01:55 -04001198 (is_multicast_ether_addr(dst) &&
1199 !compare_ether_addr(src, dev->dev_addr)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001200 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001201 break;
1202 case 0:
1203 /* DA SA BSSID */
1204 memcpy(dst, hdr->addr1, ETH_ALEN);
1205 memcpy(src, hdr->addr2, ETH_ALEN);
1206
Johannes Berg51fb61e2007-12-19 01:31:27 +01001207 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001208 if (net_ratelimit()) {
Joe Perches0795af52007-10-03 17:59:30 -07001209 printk(KERN_DEBUG "%s: dropped IBSS frame "
1210 "(DA=%s SA=%s BSSID=%s)\n",
1211 dev->name,
1212 print_mac(mac, hdr->addr1),
1213 print_mac(mac2, hdr->addr2),
1214 print_mac(mac3, hdr->addr3));
Johannes Berg571ecf62007-07-27 15:43:22 +02001215 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001216 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001217 }
1218 break;
1219 }
1220
Johannes Berg571ecf62007-07-27 15:43:22 +02001221 if (unlikely(skb->len - hdrlen < 8)) {
1222 if (net_ratelimit()) {
1223 printk(KERN_DEBUG "%s: RX too short data frame "
1224 "payload\n", dev->name);
1225 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001226 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001227 }
1228
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001229 payload = skb->data + hdrlen;
Johannes Berg571ecf62007-07-27 15:43:22 +02001230 ethertype = (payload[6] << 8) | payload[7];
1231
1232 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1233 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1234 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1235 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1236 * replace EtherType */
1237 skb_pull(skb, hdrlen + 6);
1238 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1239 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1240 } else {
1241 struct ethhdr *ehdr;
1242 __be16 len;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001243
Johannes Berg571ecf62007-07-27 15:43:22 +02001244 skb_pull(skb, hdrlen);
1245 len = htons(skb->len);
1246 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1247 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1248 memcpy(ehdr->h_source, src, ETH_ALEN);
1249 ehdr->h_proto = len;
1250 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001251 return 0;
1252}
Johannes Berg571ecf62007-07-27 15:43:22 +02001253
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001254/*
1255 * requires that rx->skb is a frame with ethernet header
1256 */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001257static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001258{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301259 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001260 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1261 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1262
1263 /*
1264 * Allow EAPOL frames to us/the PAE group address regardless
1265 * of whether the frame was encrypted or not.
1266 */
1267 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1268 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1269 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1270 return true;
1271
1272 if (ieee80211_802_1x_port_control(rx) ||
1273 ieee80211_drop_unencrypted(rx))
1274 return false;
1275
1276 return true;
1277}
1278
1279/*
1280 * requires that rx->skb is a frame with ethernet header
1281 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001282static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01001283ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001284{
1285 struct net_device *dev = rx->dev;
1286 struct ieee80211_local *local = rx->local;
1287 struct sk_buff *skb, *xmit_skb;
1288 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001289 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1290 struct sta_info *dsta;
Johannes Berg571ecf62007-07-27 15:43:22 +02001291
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001292 skb = rx->skb;
1293 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001294
Johannes Berg51fb61e2007-12-19 01:31:27 +01001295 if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP ||
1296 sdata->vif.type == IEEE80211_IF_TYPE_VLAN) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +01001297 (rx->flags & IEEE80211_RX_RA_MATCH)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001298 if (is_multicast_ether_addr(ehdr->h_dest)) {
1299 /*
1300 * send multicast frames both to higher layers in
1301 * local net stack and back to the wireless medium
1302 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001303 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1304 if (!xmit_skb && net_ratelimit())
Johannes Berg571ecf62007-07-27 15:43:22 +02001305 printk(KERN_DEBUG "%s: failed to clone "
1306 "multicast frame\n", dev->name);
1307 } else {
Johannes Berg571ecf62007-07-27 15:43:22 +02001308 dsta = sta_info_get(local, skb->data);
Johannes Bergd0709a62008-02-25 16:27:46 +01001309 if (dsta && dsta->sdata->dev == dev) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001310 /*
1311 * The destination station is associated to
1312 * this AP (in this VLAN), so send the frame
1313 * directly to it and do not pass it to local
1314 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02001315 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001316 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001317 skb = NULL;
1318 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001319 }
1320 }
1321
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001322 /* Mesh forwarding */
Johannes Berg902acc72008-02-23 15:17:19 +01001323 if (ieee80211_vif_is_mesh(&sdata->vif)) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001324 u8 *mesh_ttl = &((struct ieee80211s_hdr *)skb->cb)->ttl;
1325 (*mesh_ttl)--;
1326
1327 if (is_multicast_ether_addr(skb->data)) {
1328 if (*mesh_ttl > 0) {
1329 xmit_skb = skb_copy(skb, GFP_ATOMIC);
Luis Carlos Cobo69687a02008-05-05 12:29:42 -07001330 if (xmit_skb)
1331 xmit_skb->pkt_type = PACKET_OTHERHOST;
1332 else if (net_ratelimit())
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001333 printk(KERN_DEBUG "%s: failed to clone "
1334 "multicast frame\n", dev->name);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001335 } else
Johannes Berg902acc72008-02-23 15:17:19 +01001336 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta,
1337 dropped_frames_ttl);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001338 } else if (skb->pkt_type != PACKET_OTHERHOST &&
1339 compare_ether_addr(dev->dev_addr, skb->data) != 0) {
1340 if (*mesh_ttl == 0) {
Johannes Berg902acc72008-02-23 15:17:19 +01001341 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta,
1342 dropped_frames_ttl);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001343 dev_kfree_skb(skb);
1344 skb = NULL;
1345 } else {
1346 xmit_skb = skb;
1347 xmit_skb->pkt_type = PACKET_OTHERHOST;
1348 if (!(dev->flags & IFF_PROMISC))
1349 skb = NULL;
1350 }
1351 }
1352 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001353
Johannes Berg571ecf62007-07-27 15:43:22 +02001354 if (skb) {
1355 /* deliver to local stack */
1356 skb->protocol = eth_type_trans(skb, dev);
1357 memset(skb->cb, 0, sizeof(skb->cb));
1358 netif_rx(skb);
1359 }
1360
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001361 if (xmit_skb) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001362 /* send to wireless media */
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09001363 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001364 skb_reset_network_header(xmit_skb);
1365 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001366 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001367 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001368}
1369
Johannes Berg9ae54c82008-01-31 19:48:20 +01001370static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +01001371ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001372{
1373 struct net_device *dev = rx->dev;
1374 struct ieee80211_local *local = rx->local;
1375 u16 fc, ethertype;
1376 u8 *payload;
1377 struct sk_buff *skb = rx->skb, *frame = NULL;
1378 const struct ethhdr *eth;
1379 int remaining, err;
1380 u8 dst[ETH_ALEN];
1381 u8 src[ETH_ALEN];
1382 DECLARE_MAC_BUF(mac);
1383
1384 fc = rx->fc;
1385 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001386 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001387
1388 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001389 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001390
Johannes Berg5cf121c2008-02-25 16:27:43 +01001391 if (!(rx->flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001392 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001393
1394 err = ieee80211_data_to_8023(rx);
1395 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001396 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001397
1398 skb->dev = dev;
1399
1400 dev->stats.rx_packets++;
1401 dev->stats.rx_bytes += skb->len;
1402
1403 /* skip the wrapping header */
1404 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1405 if (!eth)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001406 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001407
1408 while (skb != frame) {
1409 u8 padding;
1410 __be16 len = eth->h_proto;
1411 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1412
1413 remaining = skb->len;
1414 memcpy(dst, eth->h_dest, ETH_ALEN);
1415 memcpy(src, eth->h_source, ETH_ALEN);
1416
1417 padding = ((4 - subframe_len) & 0x3);
1418 /* the last MSDU has no padding */
1419 if (subframe_len > remaining) {
Pavel Roskina4278e12008-05-12 09:02:24 -04001420 printk(KERN_DEBUG "%s: wrong buffer size\n", dev->name);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001421 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001422 }
1423
1424 skb_pull(skb, sizeof(struct ethhdr));
1425 /* if last subframe reuse skb */
1426 if (remaining <= subframe_len + padding)
1427 frame = skb;
1428 else {
1429 frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1430 subframe_len);
1431
1432 if (frame == NULL)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001433 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001434
1435 skb_reserve(frame, local->hw.extra_tx_headroom +
1436 sizeof(struct ethhdr));
1437 memcpy(skb_put(frame, ntohs(len)), skb->data,
1438 ntohs(len));
1439
1440 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1441 padding);
1442 if (!eth) {
Pavel Roskina4278e12008-05-12 09:02:24 -04001443 printk(KERN_DEBUG "%s: wrong buffer size\n",
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001444 dev->name);
1445 dev_kfree_skb(frame);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001446 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001447 }
1448 }
1449
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001450 skb_reset_network_header(frame);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001451 frame->dev = dev;
1452 frame->priority = skb->priority;
1453 rx->skb = frame;
1454
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001455 payload = frame->data;
1456 ethertype = (payload[6] << 8) | payload[7];
1457
1458 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001459 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1460 compare_ether_addr(payload,
1461 bridge_tunnel_header) == 0)) {
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001462 /* remove RFC1042 or Bridge-Tunnel
1463 * encapsulation and replace EtherType */
1464 skb_pull(frame, 6);
1465 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1466 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1467 } else {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001468 memcpy(skb_push(frame, sizeof(__be16)),
1469 &len, sizeof(__be16));
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001470 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1471 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1472 }
1473
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001474 if (!ieee80211_frame_allowed(rx)) {
1475 if (skb == frame) /* last frame */
Johannes Berge4c26ad2008-01-31 19:48:21 +01001476 return RX_DROP_UNUSABLE;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001477 dev_kfree_skb(frame);
1478 continue;
1479 }
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001480
1481 ieee80211_deliver_skb(rx);
1482 }
1483
Johannes Berg9ae54c82008-01-31 19:48:20 +01001484 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001485}
1486
Johannes Berg9ae54c82008-01-31 19:48:20 +01001487static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +01001488ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001489{
1490 struct net_device *dev = rx->dev;
1491 u16 fc;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001492 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001493
1494 fc = rx->fc;
1495 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001496 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001497
1498 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001499 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001500
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001501 err = ieee80211_data_to_8023(rx);
1502 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001503 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001504
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001505 if (!ieee80211_frame_allowed(rx))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001506 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001507
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001508 rx->skb->dev = dev;
1509
1510 dev->stats.rx_packets++;
1511 dev->stats.rx_bytes += rx->skb->len;
1512
1513 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02001514
Johannes Berg9ae54c82008-01-31 19:48:20 +01001515 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001516}
1517
Johannes Berg9ae54c82008-01-31 19:48:20 +01001518static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +01001519ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
Ron Rindjunsky71364712007-12-25 17:00:36 +02001520{
1521 struct ieee80211_local *local = rx->local;
1522 struct ieee80211_hw *hw = &local->hw;
1523 struct sk_buff *skb = rx->skb;
1524 struct ieee80211_bar *bar = (struct ieee80211_bar *) skb->data;
1525 struct tid_ampdu_rx *tid_agg_rx;
1526 u16 start_seq_num;
1527 u16 tid;
1528
1529 if (likely((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001530 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001531
1532 if ((rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BACK_REQ) {
1533 if (!rx->sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001534 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001535 tid = le16_to_cpu(bar->control) >> 12;
Ron Rindjunskycee24a32008-03-26 20:36:03 +02001536 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1537 != HT_AGG_STATE_OPERATIONAL)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001538 return RX_CONTINUE;
Ron Rindjunskycee24a32008-03-26 20:36:03 +02001539 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
Ron Rindjunsky71364712007-12-25 17:00:36 +02001540
1541 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1542
1543 /* reset session timer */
1544 if (tid_agg_rx->timeout) {
1545 unsigned long expires =
1546 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1547 mod_timer(&tid_agg_rx->session_timer, expires);
1548 }
1549
1550 /* manage reordering buffer according to requested */
1551 /* sequence number */
1552 rcu_read_lock();
1553 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1554 start_seq_num, 1);
1555 rcu_read_unlock();
Johannes Berge4c26ad2008-01-31 19:48:21 +01001556 return RX_DROP_UNUSABLE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001557 }
1558
Johannes Berg9ae54c82008-01-31 19:48:20 +01001559 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001560}
1561
Johannes Berg9ae54c82008-01-31 19:48:20 +01001562static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +01001563ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001564{
1565 struct ieee80211_sub_if_data *sdata;
1566
Johannes Berg5cf121c2008-02-25 16:27:43 +01001567 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001568 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001569
1570 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
Johannes Berg51fb61e2007-12-19 01:31:27 +01001571 if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001572 sdata->vif.type == IEEE80211_IF_TYPE_IBSS ||
1573 sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) &&
Johannes Bergddd3d2b2007-09-26 17:53:20 +02001574 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
Johannes Berg5cf121c2008-02-25 16:27:43 +01001575 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->status);
Johannes Bergf9d540e2007-09-28 14:02:09 +02001576 else
Johannes Berge4c26ad2008-01-31 19:48:21 +01001577 return RX_DROP_MONITOR;
Johannes Bergf9d540e2007-09-28 14:02:09 +02001578
Johannes Berg9ae54c82008-01-31 19:48:20 +01001579 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001580}
1581
Johannes Berg571ecf62007-07-27 15:43:22 +02001582static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1583 struct ieee80211_hdr *hdr,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001584 struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001585{
1586 int keyidx, hdrlen;
Joe Perches0795af52007-10-03 17:59:30 -07001587 DECLARE_MAC_BUF(mac);
1588 DECLARE_MAC_BUF(mac2);
Johannes Berg571ecf62007-07-27 15:43:22 +02001589
1590 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1591 if (rx->skb->len >= hdrlen + 4)
1592 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1593 else
1594 keyidx = -1;
1595
Johannes Berg1a84f3f2007-08-28 17:01:52 -04001596 if (net_ratelimit())
1597 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
Joe Perches0795af52007-10-03 17:59:30 -07001598 "failure from %s to %s keyidx=%d\n",
1599 dev->name, print_mac(mac, hdr->addr2),
1600 print_mac(mac2, hdr->addr1), keyidx);
Johannes Berg571ecf62007-07-27 15:43:22 +02001601
Johannes Berg8944b792008-01-31 19:48:26 +01001602 if (!rx->sta) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001603 /*
1604 * Some hardware seem to generate incorrect Michael MIC
1605 * reports; ignore them to avoid triggering countermeasures.
1606 */
Johannes Berg1a84f3f2007-08-28 17:01:52 -04001607 if (net_ratelimit())
1608 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
Joe Perches0795af52007-10-03 17:59:30 -07001609 "error for unknown address %s\n",
1610 dev->name, print_mac(mac, hdr->addr2));
Johannes Berg571ecf62007-07-27 15:43:22 +02001611 goto ignore;
1612 }
1613
1614 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
Johannes Berg1a84f3f2007-08-28 17:01:52 -04001615 if (net_ratelimit())
1616 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
Johannes Bergaa0daf02007-09-10 14:15:25 +02001617 "error for a frame with no PROTECTED flag (src "
Joe Perches0795af52007-10-03 17:59:30 -07001618 "%s)\n", dev->name, print_mac(mac, hdr->addr2));
Johannes Berg571ecf62007-07-27 15:43:22 +02001619 goto ignore;
1620 }
1621
Johannes Berg51fb61e2007-12-19 01:31:27 +01001622 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02001623 /*
1624 * APs with pairwise keys should never receive Michael MIC
1625 * errors for non-zero keyidx because these are reserved for
1626 * group keys and only the AP is sending real multicast
1627 * frames in the BSS.
1628 */
Johannes Bergeb063c12007-08-28 17:01:53 -04001629 if (net_ratelimit())
1630 printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1631 "a frame with non-zero keyidx (%d)"
Joe Perches0795af52007-10-03 17:59:30 -07001632 " (src %s)\n", dev->name, keyidx,
1633 print_mac(mac, hdr->addr2));
Johannes Bergeb063c12007-08-28 17:01:53 -04001634 goto ignore;
Johannes Berg571ecf62007-07-27 15:43:22 +02001635 }
1636
1637 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1638 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1639 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
Johannes Berg1a84f3f2007-08-28 17:01:52 -04001640 if (net_ratelimit())
1641 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1642 "error for a frame that cannot be encrypted "
Joe Perches0795af52007-10-03 17:59:30 -07001643 "(fc=0x%04x) (src %s)\n",
1644 dev->name, rx->fc, print_mac(mac, hdr->addr2));
Johannes Berg571ecf62007-07-27 15:43:22 +02001645 goto ignore;
1646 }
1647
Johannes Bergeb063c12007-08-28 17:01:53 -04001648 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001649 ignore:
1650 dev_kfree_skb(rx->skb);
1651 rx->skb = NULL;
1652}
1653
Johannes Berg5cf121c2008-02-25 16:27:43 +01001654/* TODO: use IEEE80211_RX_FRAGMENTED */
1655static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
Michael Wu3d30d942008-01-31 19:48:27 +01001656{
1657 struct ieee80211_sub_if_data *sdata;
1658 struct ieee80211_local *local = rx->local;
1659 struct ieee80211_rtap_hdr {
1660 struct ieee80211_radiotap_header hdr;
1661 u8 flags;
1662 u8 rate;
1663 __le16 chan_freq;
1664 __le16 chan_flags;
1665 } __attribute__ ((packed)) *rthdr;
1666 struct sk_buff *skb = rx->skb, *skb2;
1667 struct net_device *prev_dev = NULL;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001668 struct ieee80211_rx_status *status = rx->status;
Michael Wu3d30d942008-01-31 19:48:27 +01001669
Johannes Berg5cf121c2008-02-25 16:27:43 +01001670 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
Michael Wu3d30d942008-01-31 19:48:27 +01001671 goto out_free_skb;
1672
1673 if (skb_headroom(skb) < sizeof(*rthdr) &&
1674 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1675 goto out_free_skb;
1676
1677 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1678 memset(rthdr, 0, sizeof(*rthdr));
1679 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1680 rthdr->hdr.it_present =
1681 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1682 (1 << IEEE80211_RADIOTAP_RATE) |
1683 (1 << IEEE80211_RADIOTAP_CHANNEL));
1684
Johannes Berg5cf121c2008-02-25 16:27:43 +01001685 rthdr->rate = rx->rate->bitrate / 5;
Michael Wu3d30d942008-01-31 19:48:27 +01001686 rthdr->chan_freq = cpu_to_le16(status->freq);
1687
1688 if (status->band == IEEE80211_BAND_5GHZ)
1689 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1690 IEEE80211_CHAN_5GHZ);
1691 else
1692 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1693 IEEE80211_CHAN_2GHZ);
1694
1695 skb_set_mac_header(skb, 0);
1696 skb->ip_summed = CHECKSUM_UNNECESSARY;
1697 skb->pkt_type = PACKET_OTHERHOST;
1698 skb->protocol = htons(ETH_P_802_2);
1699
1700 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1701 if (!netif_running(sdata->dev))
1702 continue;
1703
1704 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR ||
1705 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1706 continue;
1707
1708 if (prev_dev) {
1709 skb2 = skb_clone(skb, GFP_ATOMIC);
1710 if (skb2) {
1711 skb2->dev = prev_dev;
1712 netif_rx(skb2);
1713 }
1714 }
1715
1716 prev_dev = sdata->dev;
1717 sdata->dev->stats.rx_packets++;
1718 sdata->dev->stats.rx_bytes += skb->len;
1719 }
1720
1721 if (prev_dev) {
1722 skb->dev = prev_dev;
1723 netif_rx(skb);
1724 skb = NULL;
1725 } else
1726 goto out_free_skb;
1727
Johannes Berg5cf121c2008-02-25 16:27:43 +01001728 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
Michael Wu3d30d942008-01-31 19:48:27 +01001729 return;
1730
1731 out_free_skb:
1732 dev_kfree_skb(skb);
1733}
1734
Johannes Berg5cf121c2008-02-25 16:27:43 +01001735typedef ieee80211_rx_result (*ieee80211_rx_handler)(struct ieee80211_rx_data *);
Johannes Berg58905292008-01-31 19:48:25 +01001736static ieee80211_rx_handler ieee80211_rx_handlers[] =
Johannes Berg571ecf62007-07-27 15:43:22 +02001737{
Johannes Berg571ecf62007-07-27 15:43:22 +02001738 ieee80211_rx_h_passive_scan,
1739 ieee80211_rx_h_check,
Johannes Berg4f0d18e2007-09-26 15:19:40 +02001740 ieee80211_rx_h_decrypt,
Johannes Berg70f08762007-09-26 17:53:14 +02001741 ieee80211_rx_h_sta_process,
Johannes Berg571ecf62007-07-27 15:43:22 +02001742 ieee80211_rx_h_defragment,
1743 ieee80211_rx_h_ps_poll,
1744 ieee80211_rx_h_michael_mic_verify,
1745 /* this must be after decryption - so header is counted in MPDU mic
1746 * must be before pae and data, so QOS_DATA format frames
1747 * are not passed to user space by these functions
1748 */
1749 ieee80211_rx_h_remove_qos_control,
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001750 ieee80211_rx_h_amsdu,
Johannes Berg571ecf62007-07-27 15:43:22 +02001751 ieee80211_rx_h_data,
Ron Rindjunsky71364712007-12-25 17:00:36 +02001752 ieee80211_rx_h_ctrl,
Johannes Berg571ecf62007-07-27 15:43:22 +02001753 ieee80211_rx_h_mgmt,
1754 NULL
1755};
1756
Johannes Berg8944b792008-01-31 19:48:26 +01001757static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001758 struct ieee80211_rx_data *rx,
Johannes Berg8944b792008-01-31 19:48:26 +01001759 struct sk_buff *skb)
Johannes Berg58905292008-01-31 19:48:25 +01001760{
1761 ieee80211_rx_handler *handler;
1762 ieee80211_rx_result res = RX_DROP_MONITOR;
1763
Johannes Berg8944b792008-01-31 19:48:26 +01001764 rx->skb = skb;
1765 rx->sdata = sdata;
1766 rx->dev = sdata->dev;
1767
Johannes Berg58905292008-01-31 19:48:25 +01001768 for (handler = ieee80211_rx_handlers; *handler != NULL; handler++) {
1769 res = (*handler)(rx);
1770
1771 switch (res) {
1772 case RX_CONTINUE:
1773 continue;
1774 case RX_DROP_UNUSABLE:
1775 case RX_DROP_MONITOR:
Johannes Berg8944b792008-01-31 19:48:26 +01001776 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1777 if (rx->sta)
1778 rx->sta->rx_dropped++;
Johannes Berg58905292008-01-31 19:48:25 +01001779 break;
1780 case RX_QUEUED:
Johannes Berg8944b792008-01-31 19:48:26 +01001781 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
Johannes Berg58905292008-01-31 19:48:25 +01001782 break;
1783 }
1784 break;
1785 }
1786
1787 switch (res) {
Johannes Berg58905292008-01-31 19:48:25 +01001788 case RX_CONTINUE:
Michael Wu3d30d942008-01-31 19:48:27 +01001789 case RX_DROP_MONITOR:
1790 ieee80211_rx_cooked_monitor(rx);
1791 break;
1792 case RX_DROP_UNUSABLE:
Johannes Berg58905292008-01-31 19:48:25 +01001793 dev_kfree_skb(rx->skb);
1794 break;
1795 }
1796}
1797
Johannes Berg571ecf62007-07-27 15:43:22 +02001798/* main receive path */
1799
Johannes Berg23a24de2007-07-27 15:43:22 +02001800static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001801 u8 *bssid, struct ieee80211_rx_data *rx,
Johannes Berg23a24de2007-07-27 15:43:22 +02001802 struct ieee80211_hdr *hdr)
1803{
1804 int multicast = is_multicast_ether_addr(hdr->addr1);
1805
Johannes Berg51fb61e2007-12-19 01:31:27 +01001806 switch (sdata->vif.type) {
Johannes Berg23a24de2007-07-27 15:43:22 +02001807 case IEEE80211_IF_TYPE_STA:
1808 if (!bssid)
1809 return 0;
1810 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01001811 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02001812 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001813 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001814 } else if (!multicast &&
1815 compare_ether_addr(sdata->dev->dev_addr,
1816 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04001817 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02001818 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001819 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001820 }
1821 break;
1822 case IEEE80211_IF_TYPE_IBSS:
1823 if (!bssid)
1824 return 0;
Bruno Randolf9d9bf772008-02-18 11:21:36 +09001825 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
1826 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON)
1827 return 1;
1828 else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01001829 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02001830 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001831 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001832 } else if (!multicast &&
1833 compare_ether_addr(sdata->dev->dev_addr,
1834 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04001835 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02001836 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001837 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001838 } else if (!rx->sta)
1839 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1840 bssid, hdr->addr2);
1841 break;
Johannes Berg6032f932008-02-23 15:17:07 +01001842 case IEEE80211_IF_TYPE_MESH_POINT:
1843 if (!multicast &&
1844 compare_ether_addr(sdata->dev->dev_addr,
1845 hdr->addr1) != 0) {
1846 if (!(sdata->dev->flags & IFF_PROMISC))
1847 return 0;
1848
Johannes Berg5cf121c2008-02-25 16:27:43 +01001849 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg6032f932008-02-23 15:17:07 +01001850 }
1851 break;
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02001852 case IEEE80211_IF_TYPE_VLAN:
Johannes Berg23a24de2007-07-27 15:43:22 +02001853 case IEEE80211_IF_TYPE_AP:
1854 if (!bssid) {
1855 if (compare_ether_addr(sdata->dev->dev_addr,
1856 hdr->addr1))
1857 return 0;
1858 } else if (!ieee80211_bssid_match(bssid,
1859 sdata->dev->dev_addr)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01001860 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02001861 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001862 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02001863 }
Jiri Slabybadffb72007-08-28 17:01:54 -04001864 if (sdata->dev == sdata->local->mdev &&
Johannes Berg5cf121c2008-02-25 16:27:43 +01001865 !(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02001866 /* do not receive anything via
1867 * master device when not scanning */
1868 return 0;
1869 break;
1870 case IEEE80211_IF_TYPE_WDS:
1871 if (bssid ||
1872 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1873 return 0;
1874 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1875 return 0;
1876 break;
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02001877 case IEEE80211_IF_TYPE_MNTR:
1878 /* take everything */
1879 break;
Johannes Berga2897552007-09-28 14:01:25 +02001880 case IEEE80211_IF_TYPE_INVALID:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02001881 /* should never get here */
1882 WARN_ON(1);
1883 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02001884 }
1885
1886 return 1;
1887}
1888
Johannes Berg571ecf62007-07-27 15:43:22 +02001889/*
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02001890 * This is the actual Rx frames handler. as it blongs to Rx path it must
1891 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02001892 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02001893static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
1894 struct sk_buff *skb,
1895 struct ieee80211_rx_status *status,
Johannes Berg8318d782008-01-24 19:38:38 +01001896 struct ieee80211_rate *rate)
Johannes Berg571ecf62007-07-27 15:43:22 +02001897{
1898 struct ieee80211_local *local = hw_to_local(hw);
1899 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02001900 struct ieee80211_hdr *hdr;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001901 struct ieee80211_rx_data rx;
Johannes Berg571ecf62007-07-27 15:43:22 +02001902 u16 type;
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02001903 int prepares;
Johannes Berg8e6f0032007-07-27 15:43:22 +02001904 struct ieee80211_sub_if_data *prev = NULL;
1905 struct sk_buff *skb_new;
1906 u8 *bssid;
Johannes Berg571ecf62007-07-27 15:43:22 +02001907
1908 hdr = (struct ieee80211_hdr *) skb->data;
1909 memset(&rx, 0, sizeof(rx));
1910 rx.skb = skb;
1911 rx.local = local;
1912
Johannes Berg5cf121c2008-02-25 16:27:43 +01001913 rx.status = status;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001914 rx.rate = rate;
Johannes Bergb2e77712007-09-26 15:19:39 +02001915 rx.fc = le16_to_cpu(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +02001916 type = rx.fc & IEEE80211_FCTL_FTYPE;
Johannes Berg72abd812007-09-17 01:29:22 -04001917
Johannes Bergb2e77712007-09-26 15:19:39 +02001918 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
Johannes Berg571ecf62007-07-27 15:43:22 +02001919 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02001920
Johannes Berg8944b792008-01-31 19:48:26 +01001921 rx.sta = sta_info_get(local, hdr->addr2);
1922 if (rx.sta) {
Johannes Bergd0709a62008-02-25 16:27:46 +01001923 rx.sdata = rx.sta->sdata;
1924 rx.dev = rx.sta->sdata->dev;
Johannes Bergb2e77712007-09-26 15:19:39 +02001925 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001926
Johannes Berg571ecf62007-07-27 15:43:22 +02001927 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
Johannes Berg8944b792008-01-31 19:48:26 +01001928 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
Johannes Bergd0709a62008-02-25 16:27:46 +01001929 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02001930 }
1931
Zhu Yiece8edd2007-11-22 10:53:21 +08001932 if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
Johannes Berg5cf121c2008-02-25 16:27:43 +01001933 rx.flags |= IEEE80211_RX_IN_SCAN;
Johannes Berg571ecf62007-07-27 15:43:22 +02001934
Johannes Berg38f37142008-01-29 17:07:43 +01001935 ieee80211_parse_qos(&rx);
1936 ieee80211_verify_ip_alignment(&rx);
1937
Johannes Berg571ecf62007-07-27 15:43:22 +02001938 skb = rx.skb;
1939
Johannes Berg79010422007-09-18 17:29:21 -04001940 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg2a8a9a82007-08-28 17:01:52 -04001941 if (!netif_running(sdata->dev))
1942 continue;
1943
Johannes Berg51fb61e2007-12-19 01:31:27 +01001944 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR)
Johannes Bergb2e77712007-09-26 15:19:39 +02001945 continue;
1946
Johannes Berg51fb61e2007-12-19 01:31:27 +01001947 bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
Johannes Berg5cf121c2008-02-25 16:27:43 +01001948 rx.flags |= IEEE80211_RX_RA_MATCH;
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02001949 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
Johannes Berg23a24de2007-07-27 15:43:22 +02001950
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02001951 if (!prepares)
Johannes Berg23a24de2007-07-27 15:43:22 +02001952 continue;
Johannes Berg8e6f0032007-07-27 15:43:22 +02001953
Johannes Berg340e11f2007-07-27 15:43:22 +02001954 /*
1955 * frame is destined for this interface, but if it's not
1956 * also for the previous one we handle that after the
1957 * loop to avoid copying the SKB once too much
1958 */
1959
1960 if (!prev) {
1961 prev = sdata;
1962 continue;
Johannes Berg8e6f0032007-07-27 15:43:22 +02001963 }
Johannes Berg340e11f2007-07-27 15:43:22 +02001964
1965 /*
1966 * frame was destined for the previous interface
1967 * so invoke RX handlers for it
1968 */
1969
1970 skb_new = skb_copy(skb, GFP_ATOMIC);
1971 if (!skb_new) {
1972 if (net_ratelimit())
1973 printk(KERN_DEBUG "%s: failed to copy "
Pavel Roskina4278e12008-05-12 09:02:24 -04001974 "multicast frame for %s\n",
Johannes Bergdd1cd4c2007-09-18 17:29:20 -04001975 wiphy_name(local->hw.wiphy),
1976 prev->dev->name);
Johannes Berg340e11f2007-07-27 15:43:22 +02001977 continue;
1978 }
Helmut Schaa69f817b2007-12-21 15:16:35 +01001979 rx.fc = le16_to_cpu(hdr->frame_control);
Johannes Berg8944b792008-01-31 19:48:26 +01001980 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
Johannes Berg8e6f0032007-07-27 15:43:22 +02001981 prev = sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02001982 }
Johannes Berg8e6f0032007-07-27 15:43:22 +02001983 if (prev) {
Helmut Schaa69f817b2007-12-21 15:16:35 +01001984 rx.fc = le16_to_cpu(hdr->frame_control);
Johannes Berg8944b792008-01-31 19:48:26 +01001985 ieee80211_invoke_rx_handlers(prev, &rx, skb);
Johannes Berg8e6f0032007-07-27 15:43:22 +02001986 } else
1987 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001988}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02001989
Ron Rindjunskyb5807812007-12-25 17:00:35 +02001990#define SEQ_MODULO 0x1000
1991#define SEQ_MASK 0xfff
1992
1993static inline int seq_less(u16 sq1, u16 sq2)
1994{
1995 return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1));
1996}
1997
1998static inline u16 seq_inc(u16 sq)
1999{
2000 return ((sq + 1) & SEQ_MASK);
2001}
2002
2003static inline u16 seq_sub(u16 sq1, u16 sq2)
2004{
2005 return ((sq1 - sq2) & SEQ_MASK);
2006}
2007
2008
Ron Rindjunsky71364712007-12-25 17:00:36 +02002009/*
2010 * As it function blongs to Rx path it must be called with
2011 * the proper rcu_read_lock protection for its flow.
2012 */
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002013u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2014 struct tid_ampdu_rx *tid_agg_rx,
2015 struct sk_buff *skb, u16 mpdu_seq_num,
2016 int bar_req)
2017{
2018 struct ieee80211_local *local = hw_to_local(hw);
2019 struct ieee80211_rx_status status;
2020 u16 head_seq_num, buf_size;
2021 int index;
Johannes Berg8318d782008-01-24 19:38:38 +01002022 struct ieee80211_supported_band *sband;
2023 struct ieee80211_rate *rate;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002024
2025 buf_size = tid_agg_rx->buf_size;
2026 head_seq_num = tid_agg_rx->head_seq_num;
2027
2028 /* frame with out of date sequence number */
2029 if (seq_less(mpdu_seq_num, head_seq_num)) {
2030 dev_kfree_skb(skb);
2031 return 1;
2032 }
2033
2034 /* if frame sequence number exceeds our buffering window size or
2035 * block Ack Request arrived - release stored frames */
2036 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2037 /* new head to the ordering buffer */
2038 if (bar_req)
2039 head_seq_num = mpdu_seq_num;
2040 else
2041 head_seq_num =
2042 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2043 /* release stored frames up to new head to stack */
2044 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2045 index = seq_sub(tid_agg_rx->head_seq_num,
2046 tid_agg_rx->ssn)
2047 % tid_agg_rx->buf_size;
2048
2049 if (tid_agg_rx->reorder_buf[index]) {
2050 /* release the reordered frames to stack */
2051 memcpy(&status,
2052 tid_agg_rx->reorder_buf[index]->cb,
2053 sizeof(status));
Johannes Berg8318d782008-01-24 19:38:38 +01002054 sband = local->hw.wiphy->bands[status.band];
2055 rate = &sband->bitrates[status.rate_idx];
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002056 __ieee80211_rx_handle_packet(hw,
2057 tid_agg_rx->reorder_buf[index],
Johannes Berg9e72ebd2008-05-21 17:33:42 +02002058 &status, rate);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002059 tid_agg_rx->stored_mpdu_num--;
2060 tid_agg_rx->reorder_buf[index] = NULL;
2061 }
2062 tid_agg_rx->head_seq_num =
2063 seq_inc(tid_agg_rx->head_seq_num);
2064 }
2065 if (bar_req)
2066 return 1;
2067 }
2068
2069 /* now the new frame is always in the range of the reordering */
2070 /* buffer window */
2071 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2072 % tid_agg_rx->buf_size;
2073 /* check if we already stored this frame */
2074 if (tid_agg_rx->reorder_buf[index]) {
2075 dev_kfree_skb(skb);
2076 return 1;
2077 }
2078
2079 /* if arrived mpdu is in the right order and nothing else stored */
2080 /* release it immediately */
2081 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2082 tid_agg_rx->stored_mpdu_num == 0) {
2083 tid_agg_rx->head_seq_num =
2084 seq_inc(tid_agg_rx->head_seq_num);
2085 return 0;
2086 }
2087
2088 /* put the frame in the reordering buffer */
2089 tid_agg_rx->reorder_buf[index] = skb;
2090 tid_agg_rx->stored_mpdu_num++;
2091 /* release the buffer until next missing frame */
2092 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2093 % tid_agg_rx->buf_size;
2094 while (tid_agg_rx->reorder_buf[index]) {
2095 /* release the reordered frame back to stack */
2096 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2097 sizeof(status));
Johannes Berg8318d782008-01-24 19:38:38 +01002098 sband = local->hw.wiphy->bands[status.band];
2099 rate = &sband->bitrates[status.rate_idx];
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002100 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
Johannes Berg9e72ebd2008-05-21 17:33:42 +02002101 &status, rate);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002102 tid_agg_rx->stored_mpdu_num--;
2103 tid_agg_rx->reorder_buf[index] = NULL;
2104 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2105 index = seq_sub(tid_agg_rx->head_seq_num,
2106 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2107 }
2108 return 1;
2109}
2110
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002111static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2112 struct sk_buff *skb)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002113{
2114 struct ieee80211_hw *hw = &local->hw;
2115 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2116 struct sta_info *sta;
2117 struct tid_ampdu_rx *tid_agg_rx;
Harvey Harrison87228f52008-06-11 14:21:59 -07002118 u16 sc;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002119 u16 mpdu_seq_num;
2120 u8 ret = 0, *qc;
2121 int tid;
2122
2123 sta = sta_info_get(local, hdr->addr2);
2124 if (!sta)
2125 return ret;
2126
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002127 /* filter the QoS data rx stream according to
2128 * STA/TID and check if this STA/TID is on aggregation */
Harvey Harrison87228f52008-06-11 14:21:59 -07002129 if (!ieee80211_is_data_qos(hdr->frame_control))
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002130 goto end_reorder;
2131
Harvey Harrison87228f52008-06-11 14:21:59 -07002132 qc = ieee80211_get_qos_ctl(hdr);
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002133 tid = qc[0] & QOS_CONTROL_TID_MASK;
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002134
Ron Rindjunskycee24a32008-03-26 20:36:03 +02002135 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002136 goto end_reorder;
2137
Ron Rindjunskycee24a32008-03-26 20:36:03 +02002138 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2139
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002140 /* null data frames are excluded */
Harvey Harrison87228f52008-06-11 14:21:59 -07002141 if (unlikely(ieee80211_is_nullfunc(hdr->frame_control)))
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002142 goto end_reorder;
2143
2144 /* new un-ordered ampdu frame - process it */
2145
2146 /* reset session timer */
2147 if (tid_agg_rx->timeout) {
2148 unsigned long expires =
2149 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
2150 mod_timer(&tid_agg_rx->session_timer, expires);
2151 }
2152
2153 /* if this mpdu is fragmented - terminate rx aggregation session */
2154 sc = le16_to_cpu(hdr->seq_ctrl);
2155 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Bergd0709a62008-02-25 16:27:46 +01002156 ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr,
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002157 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2158 ret = 1;
2159 goto end_reorder;
2160 }
2161
2162 /* according to mpdu sequence number deal with reordering buffer */
2163 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2164 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2165 mpdu_seq_num, 0);
Johannes Bergd0709a62008-02-25 16:27:46 +01002166 end_reorder:
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002167 return ret;
2168}
2169
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002170/*
2171 * This is the receive path handler. It is called by a low level driver when an
2172 * 802.11 MPDU is received from the hardware.
2173 */
2174void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2175 struct ieee80211_rx_status *status)
2176{
2177 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01002178 struct ieee80211_rate *rate = NULL;
2179 struct ieee80211_supported_band *sband;
2180
2181 if (status->band < 0 ||
Adrian Bunk13d8fd22008-04-23 12:51:28 +03002182 status->band >= IEEE80211_NUM_BANDS) {
Johannes Berg8318d782008-01-24 19:38:38 +01002183 WARN_ON(1);
2184 return;
2185 }
2186
2187 sband = local->hw.wiphy->bands[status->band];
2188
2189 if (!sband ||
2190 status->rate_idx < 0 ||
2191 status->rate_idx >= sband->n_bitrates) {
2192 WARN_ON(1);
2193 return;
2194 }
2195
2196 rate = &sband->bitrates[status->rate_idx];
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002197
2198 /*
2199 * key references and virtual interfaces are protected using RCU
2200 * and this requires that we are in a read-side RCU section during
2201 * receive processing
2202 */
2203 rcu_read_lock();
2204
2205 /*
2206 * Frames with failed FCS/PLCP checksum are not returned,
2207 * all other frames are returned without radiotap header
2208 * if it was previously present.
2209 * Also, frames with less than 16 bytes are dropped.
2210 */
Johannes Berg8318d782008-01-24 19:38:38 +01002211 skb = ieee80211_rx_monitor(local, skb, status, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002212 if (!skb) {
2213 rcu_read_unlock();
2214 return;
2215 }
2216
Ron Rindjunskyb5807812007-12-25 17:00:35 +02002217 if (!ieee80211_rx_reorder_ampdu(local, skb))
Johannes Berg9e72ebd2008-05-21 17:33:42 +02002218 __ieee80211_rx_handle_packet(hw, skb, status, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002219
2220 rcu_read_unlock();
2221}
Johannes Berg571ecf62007-07-27 15:43:22 +02002222EXPORT_SYMBOL(__ieee80211_rx);
2223
2224/* This is a version of the rx handler that can be called from hard irq
2225 * context. Post the skb on the queue and schedule the tasklet */
2226void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2227 struct ieee80211_rx_status *status)
2228{
2229 struct ieee80211_local *local = hw_to_local(hw);
2230
2231 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2232
2233 skb->dev = local->mdev;
2234 /* copy status into skb->cb for use by tasklet */
2235 memcpy(skb->cb, status, sizeof(*status));
2236 skb->pkt_type = IEEE80211_RX_MSG;
2237 skb_queue_tail(&local->skb_queue, skb);
2238 tasklet_schedule(&local->tasklet);
2239}
2240EXPORT_SYMBOL(ieee80211_rx_irqsafe);