blob: 8301b4a980a2019d4fe0615115c31fa778a65ae5 [file] [log] [blame]
Johannes Berg571ecf62007-07-27 15:43:22 +02001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
Johannes Berg84040802010-02-15 12:46:39 +02005 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
Johannes Berg571ecf62007-07-27 15:43:22 +02006 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
S.Çağlar Onurab466232008-02-14 17:36:47 +020012#include <linux/jiffies.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020014#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
Johannes Bergd4e46a32007-09-14 11:10:24 -040018#include <linux/rcupdate.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020019#include <net/mac80211.h>
20#include <net/ieee80211_radiotap.h>
21
22#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020023#include "driver-ops.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040024#include "led.h"
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +010025#include "mesh.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020026#include "wep.h"
27#include "wpa.h"
28#include "tkip.h"
29#include "wme.h"
30
Johannes Bergb2e77712007-09-26 15:19:39 +020031/*
32 * monitor mode reception
33 *
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
36 */
37static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
Johannes Berg0869aea2009-10-28 10:03:35 +010038 struct sk_buff *skb)
Johannes Bergb2e77712007-09-26 15:19:39 +020039{
Johannes Bergb2e77712007-09-26 15:19:39 +020040 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
Zhu Yie3cf8b32010-03-29 17:35:07 +080042 __pskb_trim(skb, skb->len - FCS_LEN);
Johannes Bergb2e77712007-09-26 15:19:39 +020043 else {
44 /* driver bug */
45 WARN_ON(1);
46 dev_kfree_skb(skb);
47 skb = NULL;
48 }
49 }
50
51 return skb;
52}
53
Johannes Bergf1d58c22009-06-17 13:13:00 +020054static inline int should_drop_frame(struct sk_buff *skb,
Johannes Berg0869aea2009-10-28 10:03:35 +010055 int present_fcs_len)
Johannes Bergb2e77712007-09-26 15:19:39 +020056{
Johannes Bergf1d58c22009-06-17 13:13:00 +020057 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Harvey Harrison182503a2008-06-22 16:45:29 -070058 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Bergb2e77712007-09-26 15:19:39 +020059
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 return 1;
Johannes Berg0869aea2009-10-28 10:03:35 +010062 if (unlikely(skb->len < 16 + present_fcs_len))
Johannes Bergb2e77712007-09-26 15:19:39 +020063 return 1;
Harvey Harrison87228f52008-06-11 14:21:59 -070064 if (ieee80211_is_ctl(hdr->frame_control) &&
65 !ieee80211_is_pspoll(hdr->frame_control) &&
66 !ieee80211_is_back_req(hdr->frame_control))
Johannes Bergb2e77712007-09-26 15:19:39 +020067 return 1;
68 return 0;
69}
70
Bruno Randolf601ae7f2008-05-08 19:22:43 +020071static int
72ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73 struct ieee80211_rx_status *status)
74{
75 int len;
76
77 /* always present fields */
78 len = sizeof(struct ieee80211_radiotap_header) + 9;
79
80 if (status->flag & RX_FLAG_TSFT)
81 len += 8;
Johannes Berg7fee5372009-01-30 11:13:06 +010082 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
Bruno Randolf601ae7f2008-05-08 19:22:43 +020083 len += 1;
Bruno Randolf601ae7f2008-05-08 19:22:43 +020084
85 if (len & 1) /* padding for RX_FLAGS if necessary */
86 len++;
87
Bruno Randolf601ae7f2008-05-08 19:22:43 +020088 return len;
89}
90
Johannes Bergd1c3a372009-01-07 00:26:10 +010091/*
Bruno Randolf601ae7f2008-05-08 19:22:43 +020092 * ieee80211_add_rx_radiotap_header - add radiotap header
93 *
94 * add a radiotap header containing all the fields which the hardware provided.
95 */
96static void
97ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
98 struct sk_buff *skb,
Bruno Randolf601ae7f2008-05-08 19:22:43 +020099 struct ieee80211_rate *rate,
100 int rtap_len)
101{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200102 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200103 struct ieee80211_radiotap_header *rthdr;
104 unsigned char *pos;
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100105 u16 rx_flags = 0;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200106
107 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
108 memset(rthdr, 0, rtap_len);
109
110 /* radiotap header, set always present flags */
111 rthdr->it_present =
112 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200113 (1 << IEEE80211_RADIOTAP_CHANNEL) |
114 (1 << IEEE80211_RADIOTAP_ANTENNA) |
115 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
116 rthdr->it_len = cpu_to_le16(rtap_len);
117
118 pos = (unsigned char *)(rthdr+1);
119
120 /* the order of the following fields is important */
121
122 /* IEEE80211_RADIOTAP_TSFT */
123 if (status->flag & RX_FLAG_TSFT) {
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100124 put_unaligned_le64(status->mactime, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200125 rthdr->it_present |=
126 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
127 pos += 8;
128 }
129
130 /* IEEE80211_RADIOTAP_FLAGS */
131 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
132 *pos |= IEEE80211_RADIOTAP_F_FCS;
Johannes Bergaae89832009-03-13 12:52:10 +0100133 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
134 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
Bruno Randolfb4f28bb2008-07-30 17:19:55 +0200135 if (status->flag & RX_FLAG_SHORTPRE)
136 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200137 pos++;
138
139 /* IEEE80211_RADIOTAP_RATE */
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200140 if (status->flag & RX_FLAG_HT) {
141 /*
142 * TODO: add following information into radiotap header once
143 * suitable fields are defined for it:
144 * - MCS index (status->rate_idx)
145 * - HT40 (status->flag & RX_FLAG_40MHZ)
146 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
147 */
148 *pos = 0;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200149 } else {
Jouni Malinenebe6c7b2009-01-10 11:47:33 +0200150 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200151 *pos = rate->bitrate / 5;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200152 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200153 pos++;
154
155 /* IEEE80211_RADIOTAP_CHANNEL */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100156 put_unaligned_le16(status->freq, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200157 pos += 2;
158 if (status->band == IEEE80211_BAND_5GHZ)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100159 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
160 pos);
Johannes Berg5f0b7de2009-11-16 13:58:21 +0100161 else if (status->flag & RX_FLAG_HT)
162 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
163 pos);
Bruno Randolf9deb1ae2008-07-30 17:20:06 +0200164 else if (rate->flags & IEEE80211_RATE_ERP_G)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100165 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
166 pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200167 else
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100168 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
169 pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200170 pos += 2;
171
172 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
173 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
174 *pos = status->signal;
175 rthdr->it_present |=
176 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
177 pos++;
178 }
179
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200180 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
181
182 /* IEEE80211_RADIOTAP_ANTENNA */
183 *pos = status->antenna;
184 pos++;
185
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200186 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
187
188 /* IEEE80211_RADIOTAP_RX_FLAGS */
189 /* ensure 2 byte alignment for the 2 byte field as required */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100190 if ((pos - (u8 *)rthdr) & 1)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200191 pos++;
Johannes Bergaae89832009-03-13 12:52:10 +0100192 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100193 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
194 put_unaligned_le16(rx_flags, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200195 pos += 2;
196}
197
Johannes Bergb2e77712007-09-26 15:19:39 +0200198/*
199 * This function copies a received frame to all monitor interfaces and
200 * returns a cleaned-up SKB that no longer includes the FCS nor the
201 * radiotap header the driver might have added.
202 */
203static struct sk_buff *
204ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
Johannes Berg8318d782008-01-24 19:38:38 +0100205 struct ieee80211_rate *rate)
Johannes Bergb2e77712007-09-26 15:19:39 +0200206{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200207 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200208 struct ieee80211_sub_if_data *sdata;
Johannes Bergb2e77712007-09-26 15:19:39 +0200209 int needed_headroom = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200210 struct sk_buff *skb, *skb2;
211 struct net_device *prev_dev = NULL;
212 int present_fcs_len = 0;
Johannes Bergb2e77712007-09-26 15:19:39 +0200213
214 /*
215 * First, we may need to make a copy of the skb because
216 * (1) we need to modify it for radiotap (if not present), and
217 * (2) the other RX handlers will modify the skb we got.
218 *
219 * We don't need to, of course, if we aren't going to return
220 * the SKB because it has a bad FCS/PLCP checksum.
221 */
Johannes Berg0869aea2009-10-28 10:03:35 +0100222
223 /* room for the radiotap header based on driver features */
224 needed_headroom = ieee80211_rx_radiotap_len(local, status);
Johannes Bergb2e77712007-09-26 15:19:39 +0200225
226 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
227 present_fcs_len = FCS_LEN;
228
Zhu Yie3cf8b32010-03-29 17:35:07 +0800229 /* make sure hdr->frame_control is on the linear part */
230 if (!pskb_may_pull(origskb, 2)) {
231 dev_kfree_skb(origskb);
232 return NULL;
233 }
234
Johannes Bergb2e77712007-09-26 15:19:39 +0200235 if (!local->monitors) {
Johannes Berg0869aea2009-10-28 10:03:35 +0100236 if (should_drop_frame(origskb, present_fcs_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200237 dev_kfree_skb(origskb);
238 return NULL;
239 }
240
Johannes Berg0869aea2009-10-28 10:03:35 +0100241 return remove_monitor_info(local, origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200242 }
243
Johannes Berg0869aea2009-10-28 10:03:35 +0100244 if (should_drop_frame(origskb, present_fcs_len)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200245 /* only need to expand headroom if necessary */
246 skb = origskb;
247 origskb = NULL;
248
249 /*
250 * This shouldn't trigger often because most devices have an
251 * RX header they pull before we get here, and that should
252 * be big enough for our radiotap information. We should
253 * probably export the length to drivers so that we can have
254 * them allocate enough headroom to start with.
255 */
256 if (skb_headroom(skb) < needed_headroom &&
Johannes Bergc49e5ea2007-12-11 21:33:42 +0100257 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200258 dev_kfree_skb(skb);
259 return NULL;
260 }
261 } else {
262 /*
263 * Need to make a copy and possibly remove radiotap header
264 * and FCS from the original.
265 */
266 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
267
Johannes Berg0869aea2009-10-28 10:03:35 +0100268 origskb = remove_monitor_info(local, origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200269
270 if (!skb)
271 return origskb;
272 }
273
Johannes Berg0869aea2009-10-28 10:03:35 +0100274 /* prepend radiotap information */
275 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
Johannes Bergb2e77712007-09-26 15:19:39 +0200276
Johannes Bergce3edf6d02007-12-19 01:31:22 +0100277 skb_reset_mac_header(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200278 skb->ip_summed = CHECKSUM_UNNECESSARY;
279 skb->pkt_type = PACKET_OTHERHOST;
280 skb->protocol = htons(ETH_P_802_2);
281
282 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200283 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +0200284 continue;
285
Michael Wu3d30d942008-01-31 19:48:27 +0100286 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
287 continue;
288
Johannes Berg9607e6b2009-12-23 13:15:31 +0100289 if (!ieee80211_sdata_running(sdata))
Johannes Berg47846c92009-11-25 17:46:19 +0100290 continue;
291
Johannes Bergb2e77712007-09-26 15:19:39 +0200292 if (prev_dev) {
293 skb2 = skb_clone(skb, GFP_ATOMIC);
294 if (skb2) {
295 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400296 netif_receive_skb(skb2);
Johannes Bergb2e77712007-09-26 15:19:39 +0200297 }
298 }
299
300 prev_dev = sdata->dev;
301 sdata->dev->stats.rx_packets++;
302 sdata->dev->stats.rx_bytes += skb->len;
303 }
304
305 if (prev_dev) {
306 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400307 netif_receive_skb(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200308 } else
309 dev_kfree_skb(skb);
310
311 return origskb;
312}
313
314
Johannes Berg5cf121c2008-02-25 16:27:43 +0100315static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200316{
Harvey Harrison238f74a2008-07-02 11:05:34 -0700317 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200318 int tid;
319
320 /* does the frame have a qos control field? */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700321 if (ieee80211_is_data_qos(hdr->frame_control)) {
322 u8 *qc = ieee80211_get_qos_ctl(hdr);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200323 /* frame has qos control */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700324 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
325 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
Johannes Berg5cf121c2008-02-25 16:27:43 +0100326 rx->flags |= IEEE80211_RX_AMSDU;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +0200327 else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100328 rx->flags &= ~IEEE80211_RX_AMSDU;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200329 } else {
Johannes Berg1411f9b2008-07-10 10:11:02 +0200330 /*
331 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
332 *
333 * Sequence numbers for management frames, QoS data
334 * frames with a broadcast/multicast address in the
335 * Address 1 field, and all non-QoS data frames sent
336 * by QoS STAs are assigned using an additional single
337 * modulo-4096 counter, [...]
338 *
339 * We also use that counter for non-QoS STAs.
340 */
341 tid = NUM_RX_DATA_QUEUES - 1;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200342 }
Johannes Berg52865df2007-07-27 15:43:22 +0200343
Johannes Berg5cf121c2008-02-25 16:27:43 +0100344 rx->queue = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200345 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
346 * For now, set skb->priority to 0 for other cases. */
347 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100348}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200349
Johannes Bergd1c3a372009-01-07 00:26:10 +0100350/**
351 * DOC: Packet alignment
352 *
353 * Drivers always need to pass packets that are aligned to two-byte boundaries
354 * to the stack.
355 *
356 * Additionally, should, if possible, align the payload data in a way that
357 * guarantees that the contained IP header is aligned to a four-byte
358 * boundary. In the case of regular frames, this simply means aligning the
359 * payload to a four-byte boundary (because either the IP header is directly
360 * contained, or IV/RFC1042 headers that have a length divisible by four are
Kalle Valo59d9cb02009-12-17 13:54:57 +0100361 * in front of it). If the payload data is not properly aligned and the
362 * architecture doesn't support efficient unaligned operations, mac80211
363 * will align the data.
Johannes Bergd1c3a372009-01-07 00:26:10 +0100364 *
365 * With A-MSDU frames, however, the payload data address must yield two modulo
366 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
367 * push the IP header further back to a multiple of four again. Thankfully, the
368 * specs were sane enough this time around to require padding each A-MSDU
369 * subframe to a length that is a multiple of four.
370 *
371 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
372 * the payload is not supported, the driver is required to move the 802.11
373 * header to be directly in front of the payload in that case.
374 */
375static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
Johannes Berg38f37142008-01-29 17:07:43 +0100376{
Kalle Valo59d9cb02009-12-17 13:54:57 +0100377#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
378 WARN_ONCE((unsigned long)rx->skb->data & 1,
379 "unaligned packet at 0x%p\n", rx->skb->data);
Johannes Bergd1c3a372009-01-07 00:26:10 +0100380#endif
Johannes Berg6e0d1142007-07-27 15:43:22 +0200381}
382
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +0200383
Johannes Berg571ecf62007-07-27 15:43:22 +0200384/* rx handlers */
385
Johannes Berg49461622008-06-30 15:10:45 +0200386static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100387ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200388{
389 struct ieee80211_local *local = rx->local;
390 struct sk_buff *skb = rx->skb;
391
Helmut Schaafbe9c422009-07-23 12:14:04 +0200392 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning)))
Johannes Bergf1d58c22009-06-17 13:13:00 +0200393 return ieee80211_scan_rx(rx->sdata, skb);
Zhu Yiece8edd2007-11-22 10:53:21 +0800394
Helmut Schaa142b9f52009-07-23 13:18:01 +0200395 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) &&
396 (rx->flags & IEEE80211_RX_IN_SCAN))) {
Zhu Yiece8edd2007-11-22 10:53:21 +0800397 /* drop all the other packets during a software scan anyway */
Johannes Bergf1d58c22009-06-17 13:13:00 +0200398 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
Zhu Yiece8edd2007-11-22 10:53:21 +0800399 dev_kfree_skb(skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100400 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +0200401 }
402
Johannes Berg5cf121c2008-02-25 16:27:43 +0100403 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200404 /* scanning finished during invoking of handlers */
405 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100406 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200407 }
408
Johannes Berg9ae54c82008-01-31 19:48:20 +0100409 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200410}
411
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200412
413static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
414{
415 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
416
417 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
418 return 0;
419
420 return ieee80211_is_robust_mgmt_frame(hdr);
421}
422
423
424static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
425{
426 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
427
428 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
429 return 0;
430
431 return ieee80211_is_robust_mgmt_frame(hdr);
432}
433
434
435/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
436static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
437{
438 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
439 struct ieee80211_mmie *mmie;
440
441 if (skb->len < 24 + sizeof(*mmie) ||
442 !is_multicast_ether_addr(hdr->da))
443 return -1;
444
445 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
446 return -1; /* not a robust management frame */
447
448 mmie = (struct ieee80211_mmie *)
449 (skb->data + skb->len - sizeof(*mmie));
450 if (mmie->element_id != WLAN_EID_MMIE ||
451 mmie->length != sizeof(*mmie) - 2)
452 return -1;
453
454 return le16_to_cpu(mmie->key_id);
455}
456
457
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100458static ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100459ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100460{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700461 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
462 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg47846c92009-11-25 17:46:19 +0100463 char *dev_addr = rx->sdata->vif.addr;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100464
Harvey Harrisona7767f92008-07-02 16:30:51 -0700465 if (ieee80211_is_data(hdr->frame_control)) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700466 if (is_multicast_ether_addr(hdr->addr1)) {
467 if (ieee80211_has_tods(hdr->frame_control) ||
468 !ieee80211_has_fromds(hdr->frame_control))
469 return RX_DROP_MONITOR;
470 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
471 return RX_DROP_MONITOR;
472 } else {
473 if (!ieee80211_has_a4(hdr->frame_control))
474 return RX_DROP_MONITOR;
475 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
476 return RX_DROP_MONITOR;
477 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100478 }
479
480 /* If there is not an established peer link and this is not a peer link
481 * establisment frame, beacon or probe, drop the frame.
482 */
483
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800484 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100485 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100486
Harvey Harrisona7767f92008-07-02 16:30:51 -0700487 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100488 return RX_DROP_MONITOR;
489
Harvey Harrisona7767f92008-07-02 16:30:51 -0700490 if (ieee80211_is_action(hdr->frame_control)) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100491 mgmt = (struct ieee80211_mgmt *)hdr;
Javier Cardona97ad9132010-03-29 11:00:21 -0700492 if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100493 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100494 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100495 }
496
Harvey Harrisona7767f92008-07-02 16:30:51 -0700497 if (ieee80211_is_probe_req(hdr->frame_control) ||
498 ieee80211_is_probe_resp(hdr->frame_control) ||
499 ieee80211_is_beacon(hdr->frame_control))
500 return RX_CONTINUE;
501
502 return RX_DROP_MONITOR;
503
504 }
505
506#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
507
508 if (ieee80211_is_data(hdr->frame_control) &&
509 is_multicast_ether_addr(hdr->addr1) &&
Javier Cardona3c5772a2009-08-10 12:15:48 -0700510 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100511 return RX_DROP_MONITOR;
Johannes Berg902acc72008-02-23 15:17:19 +0100512#undef msh_h_get
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100513
Johannes Berg902acc72008-02-23 15:17:19 +0100514 return RX_CONTINUE;
515}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100516
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100517#define SEQ_MODULO 0x1000
518#define SEQ_MASK 0xfff
519
520static inline int seq_less(u16 sq1, u16 sq2)
521{
522 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
523}
524
525static inline u16 seq_inc(u16 sq)
526{
527 return (sq + 1) & SEQ_MASK;
528}
529
530static inline u16 seq_sub(u16 sq1, u16 sq2)
531{
532 return (sq1 - sq2) & SEQ_MASK;
533}
534
535
536static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
537 struct tid_ampdu_rx *tid_agg_rx,
Johannes Berg2569a822009-11-25 17:46:17 +0100538 int index,
539 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100540{
541 struct ieee80211_supported_band *sband;
542 struct ieee80211_rate *rate = NULL;
543 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
544 struct ieee80211_rx_status *status;
545
546 if (!skb)
547 goto no_frame;
548
549 status = IEEE80211_SKB_RXCB(skb);
550
551 /* release the reordered frames to stack */
552 sband = hw->wiphy->bands[status->band];
553 if (!(status->flag & RX_FLAG_HT))
554 rate = &sband->bitrates[status->rate_idx];
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100555 tid_agg_rx->stored_mpdu_num--;
556 tid_agg_rx->reorder_buf[index] = NULL;
Johannes Bergd29cecd2009-12-04 14:25:43 -0800557 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100558
559no_frame:
560 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
561}
562
563static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
564 struct tid_ampdu_rx *tid_agg_rx,
Johannes Berg2569a822009-11-25 17:46:17 +0100565 u16 head_seq_num,
566 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100567{
568 int index;
569
570 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
571 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
572 tid_agg_rx->buf_size;
Johannes Berg2569a822009-11-25 17:46:17 +0100573 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100574 }
575}
576
577/*
578 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
579 * the skb was added to the buffer longer than this time ago, the earlier
580 * frames that have not yet been received are assumed to be lost and the skb
581 * can be released for processing. This may also release other skb's from the
582 * reorder buffer if there are no additional gaps between the frames.
583 */
584#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
585
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200586static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
587 struct tid_ampdu_rx *tid_agg_rx,
588 struct sk_buff_head *frames)
589{
590 int index;
591
592 /* release the buffer until next missing frame */
593 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
594 tid_agg_rx->buf_size;
595 if (!tid_agg_rx->reorder_buf[index] &&
596 tid_agg_rx->stored_mpdu_num > 1) {
597 /*
598 * No buffers ready to be released, but check whether any
599 * frames in the reorder buffer have timed out.
600 */
601 int j;
602 int skipped = 1;
603 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
604 j = (j + 1) % tid_agg_rx->buf_size) {
605 if (!tid_agg_rx->reorder_buf[j]) {
606 skipped++;
607 continue;
608 }
609 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
610 HT_RX_REORDER_BUF_TIMEOUT))
611 break;
612
613#ifdef CONFIG_MAC80211_HT_DEBUG
614 if (net_ratelimit())
615 printk(KERN_DEBUG "%s: release an RX reorder "
616 "frame due to timeout on earlier "
617 "frames\n",
618 wiphy_name(hw->wiphy));
619#endif
620 ieee80211_release_reorder_frame(hw, tid_agg_rx,
621 j, frames);
622
623 /*
624 * Increment the head seq# also for the skipped slots.
625 */
626 tid_agg_rx->head_seq_num =
627 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
628 skipped = 0;
629 }
630 } else while (tid_agg_rx->reorder_buf[index]) {
631 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
632 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
633 tid_agg_rx->buf_size;
634 }
635}
636
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100637/*
638 * As this function belongs to the RX path it must be under
639 * rcu_read_lock protection. It returns false if the frame
640 * can be processed immediately, true if it was consumed.
641 */
642static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
643 struct tid_ampdu_rx *tid_agg_rx,
Johannes Berg2569a822009-11-25 17:46:17 +0100644 struct sk_buff *skb,
645 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100646{
647 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
648 u16 sc = le16_to_cpu(hdr->seq_ctrl);
649 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
650 u16 head_seq_num, buf_size;
651 int index;
652
653 buf_size = tid_agg_rx->buf_size;
654 head_seq_num = tid_agg_rx->head_seq_num;
655
656 /* frame with out of date sequence number */
657 if (seq_less(mpdu_seq_num, head_seq_num)) {
658 dev_kfree_skb(skb);
659 return true;
660 }
661
662 /*
663 * If frame the sequence number exceeds our buffering window
664 * size release some previous frames to make room for this one.
665 */
666 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
667 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
668 /* release stored frames up to new head to stack */
Johannes Berg2569a822009-11-25 17:46:17 +0100669 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
670 frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100671 }
672
673 /* Now the new frame is always in the range of the reordering buffer */
674
675 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
676
677 /* check if we already stored this frame */
678 if (tid_agg_rx->reorder_buf[index]) {
679 dev_kfree_skb(skb);
680 return true;
681 }
682
683 /*
684 * If the current MPDU is in the right order and nothing else
685 * is stored we can process it directly, no need to buffer it.
686 */
687 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
688 tid_agg_rx->stored_mpdu_num == 0) {
689 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
690 return false;
691 }
692
693 /* put the frame in the reordering buffer */
694 tid_agg_rx->reorder_buf[index] = skb;
695 tid_agg_rx->reorder_time[index] = jiffies;
696 tid_agg_rx->stored_mpdu_num++;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200697 ieee80211_sta_reorder_release(hw, tid_agg_rx, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100698
699 return true;
700}
701
702/*
703 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
704 * true if the MPDU was buffered, false if it should be processed.
705 */
Johannes Berg2569a822009-11-25 17:46:17 +0100706static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
707 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100708{
Johannes Berg2569a822009-11-25 17:46:17 +0100709 struct sk_buff *skb = rx->skb;
710 struct ieee80211_local *local = rx->local;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100711 struct ieee80211_hw *hw = &local->hw;
712 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Johannes Berg2569a822009-11-25 17:46:17 +0100713 struct sta_info *sta = rx->sta;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100714 struct tid_ampdu_rx *tid_agg_rx;
715 u16 sc;
716 int tid;
717
718 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg2569a822009-11-25 17:46:17 +0100719 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100720
721 /*
722 * filter the QoS data rx stream according to
723 * STA/TID and check if this STA/TID is on aggregation
724 */
725
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100726 if (!sta)
Johannes Berg2569a822009-11-25 17:46:17 +0100727 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100728
729 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
730
Johannes Berga87f7362010-06-10 10:21:38 +0200731 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
732 if (!tid_agg_rx)
733 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100734
735 /* qos null data frames are excluded */
736 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Johannes Berga87f7362010-06-10 10:21:38 +0200737 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100738
739 /* new, potentially un-ordered, ampdu frame - process it */
740
741 /* reset session timer */
742 if (tid_agg_rx->timeout)
743 mod_timer(&tid_agg_rx->session_timer,
744 TU_TO_EXP_TIME(tid_agg_rx->timeout));
745
746 /* if this mpdu is fragmented - terminate rx aggregation session */
747 sc = le16_to_cpu(hdr->seq_ctrl);
748 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Bergc1475ca2010-06-10 10:21:37 +0200749 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg344eec62010-06-10 10:21:36 +0200750 skb_queue_tail(&rx->sdata->skb_queue, skb);
751 ieee80211_queue_work(&local->hw, &rx->sdata->work);
Johannes Berg2569a822009-11-25 17:46:17 +0100752 return;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100753 }
754
Johannes Berga87f7362010-06-10 10:21:38 +0200755 /*
756 * No locking needed -- we will only ever process one
757 * RX packet at a time, and thus own tid_agg_rx. All
758 * other code manipulating it needs to (and does) make
759 * sure that we cannot get to it any more before doing
760 * anything with it.
761 */
762 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
Johannes Berg2569a822009-11-25 17:46:17 +0100763 return;
764
765 dont_reorder:
766 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100767}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100768
Johannes Berg49461622008-06-30 15:10:45 +0200769static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100770ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +0200771{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700772 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +0200773
774 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
775 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700776 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
Johannes Berg5cf121c2008-02-25 16:27:43 +0100777 rx->sta->last_seq_ctrl[rx->queue] ==
Johannes Berg571ecf62007-07-27 15:43:22 +0200778 hdr->seq_ctrl)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +0100779 if (rx->flags & IEEE80211_RX_RA_MATCH) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200780 rx->local->dot11FrameDuplicateCount++;
781 rx->sta->num_duplicates++;
782 }
Johannes Berge4c26ad2008-01-31 19:48:21 +0100783 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200784 } else
Johannes Berg5cf121c2008-02-25 16:27:43 +0100785 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +0200786 }
787
Johannes Berg571ecf62007-07-27 15:43:22 +0200788 if (unlikely(rx->skb->len < 16)) {
789 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100790 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200791 }
792
Johannes Berg571ecf62007-07-27 15:43:22 +0200793 /* Drop disallowed frame classes based on STA auth/assoc state;
794 * IEEE 802.11, Chap 5.5.
795 *
Johannes Bergccd7b362008-09-11 00:01:56 +0200796 * mac80211 filters only based on association state, i.e. it drops
797 * Class 3 frames from not associated stations. hostapd sends
Johannes Berg571ecf62007-07-27 15:43:22 +0200798 * deauth/disassoc frames when needed. In addition, hostapd is
799 * responsible for filtering on both auth and assoc states.
800 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100801
Johannes Berg902acc72008-02-23 15:17:19 +0100802 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100803 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100804
Harvey Harrisona7767f92008-07-02 16:30:51 -0700805 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
806 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200807 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Johannes Berg07346f812008-05-03 01:02:02 +0200808 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
Harvey Harrisona7767f92008-07-02 16:30:51 -0700809 if ((!ieee80211_has_fromds(hdr->frame_control) &&
810 !ieee80211_has_tods(hdr->frame_control) &&
811 ieee80211_is_data(hdr->frame_control)) ||
812 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200813 /* Drop IBSS frames and frames for other hosts
814 * silently. */
Johannes Berge4c26ad2008-01-31 19:48:21 +0100815 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200816 }
817
Johannes Berge4c26ad2008-01-31 19:48:21 +0100818 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +0200819 }
820
Johannes Berg9ae54c82008-01-31 19:48:20 +0100821 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +0200822}
823
824
Johannes Berg49461622008-06-30 15:10:45 +0200825static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100826ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
Johannes Berg570bd532007-07-27 15:43:22 +0200827{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100828 struct sk_buff *skb = rx->skb;
829 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
830 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg3017b802007-08-28 17:01:53 -0400831 int keyidx;
832 int hdrlen;
Johannes Berge4c26ad2008-01-31 19:48:21 +0100833 ieee80211_rx_result result = RX_DROP_UNUSABLE;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400834 struct ieee80211_key *stakey = NULL;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200835 int mmie_keyidx = -1;
Johannes Berg761ab472010-05-28 14:24:19 +0200836 __le16 fc;
Johannes Berg570bd532007-07-27 15:43:22 +0200837
Johannes Berg3017b802007-08-28 17:01:53 -0400838 /*
839 * Key selection 101
840 *
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200841 * There are four types of keys:
Johannes Berg3017b802007-08-28 17:01:53 -0400842 * - GTK (group keys)
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200843 * - IGTK (group keys for management frames)
Johannes Berg3017b802007-08-28 17:01:53 -0400844 * - PTK (pairwise keys)
845 * - STK (station-to-station pairwise keys)
846 *
847 * When selecting a key, we have to distinguish between multicast
848 * (including broadcast) and unicast frames, the latter can only
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200849 * use PTKs and STKs while the former always use GTKs and IGTKs.
850 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
851 * unicast frames can also use key indices like GTKs. Hence, if we
852 * don't have a PTK/STK we check the key index for a WEP key.
Johannes Berg3017b802007-08-28 17:01:53 -0400853 *
Johannes Berg8dc06a12007-08-28 17:01:55 -0400854 * Note that in a regular BSS, multicast frames are sent by the
855 * AP only, associated stations unicast the frame to the AP first
856 * which then multicasts it on their behalf.
857 *
Johannes Berg3017b802007-08-28 17:01:53 -0400858 * There is also a slight problem in IBSS mode: GTKs are negotiated
859 * with each station, that is something we don't currently handle.
Johannes Berg8dc06a12007-08-28 17:01:55 -0400860 * The spec seems to expect that one negotiates the same key with
861 * every station but there's no such requirement; VLANs could be
862 * possible.
Johannes Berg3017b802007-08-28 17:01:53 -0400863 */
Johannes Berg571ecf62007-07-27 15:43:22 +0200864
Johannes Berg3017b802007-08-28 17:01:53 -0400865 /*
Johannes Berg1990af82007-09-26 17:53:15 +0200866 * No point in finding a key and decrypting if the frame is neither
Johannes Berg3017b802007-08-28 17:01:53 -0400867 * addressed to us nor a multicast frame.
868 */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100869 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100870 return RX_CONTINUE;
Johannes Berg3017b802007-08-28 17:01:53 -0400871
Johannes Berg2569a822009-11-25 17:46:17 +0100872 /* start without a key */
873 rx->key = NULL;
874
Johannes Bergd4e46a32007-09-14 11:10:24 -0400875 if (rx->sta)
876 stakey = rcu_dereference(rx->sta->key);
877
Johannes Berg761ab472010-05-28 14:24:19 +0200878 fc = hdr->frame_control;
879
880 if (!ieee80211_has_protected(fc))
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300881 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
882
Johannes Bergd4e46a32007-09-14 11:10:24 -0400883 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
884 rx->key = stakey;
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300885 /* Skip decryption if the frame is not protected. */
Johannes Berg761ab472010-05-28 14:24:19 +0200886 if (!ieee80211_has_protected(fc))
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300887 return RX_CONTINUE;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200888 } else if (mmie_keyidx >= 0) {
889 /* Broadcast/multicast robust management frame / BIP */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100890 if ((status->flag & RX_FLAG_DECRYPTED) &&
891 (status->flag & RX_FLAG_IV_STRIPPED))
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200892 return RX_CONTINUE;
893
894 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
895 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
896 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
897 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
Johannes Berg761ab472010-05-28 14:24:19 +0200898 } else if (!ieee80211_has_protected(fc)) {
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300899 /*
900 * The frame was not protected, so skip decryption. However, we
901 * need to set rx->key if there is a key that could have been
902 * used so that the frame may be dropped if encryption would
903 * have been expected.
904 */
905 struct ieee80211_key *key = NULL;
Johannes Berg761ab472010-05-28 14:24:19 +0200906 if (ieee80211_is_mgmt(fc) &&
Jouni Malinen0c7c10c2009-05-08 12:34:10 +0300907 is_multicast_ether_addr(hdr->addr1) &&
908 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
909 rx->key = key;
910 else if ((key = rcu_dereference(rx->sdata->default_key)))
911 rx->key = key;
912 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200913 } else {
Zhu Yi39184b12010-04-08 15:35:10 +0800914 u8 keyid;
Johannes Berg3017b802007-08-28 17:01:53 -0400915 /*
916 * The device doesn't give us the IV so we won't be
917 * able to look up the key. That's ok though, we
918 * don't need to decrypt the frame, we just won't
919 * be able to keep statistics accurate.
920 * Except for key threshold notifications, should
921 * we somehow allow the driver to tell us which key
922 * the hardware used if this flag is set?
923 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100924 if ((status->flag & RX_FLAG_DECRYPTED) &&
925 (status->flag & RX_FLAG_IV_STRIPPED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100926 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +0200927
Johannes Berg761ab472010-05-28 14:24:19 +0200928 hdrlen = ieee80211_hdrlen(fc);
Johannes Berg571ecf62007-07-27 15:43:22 +0200929
Johannes Berg3017b802007-08-28 17:01:53 -0400930 if (rx->skb->len < 8 + hdrlen)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100931 return RX_DROP_UNUSABLE; /* TODO: count this? */
Johannes Berg571ecf62007-07-27 15:43:22 +0200932
Johannes Berg3017b802007-08-28 17:01:53 -0400933 /*
934 * no need to call ieee80211_wep_get_keyidx,
935 * it verifies a bunch of things we've done already
936 */
Zhu Yi39184b12010-04-08 15:35:10 +0800937 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
938 keyidx = keyid >> 6;
Johannes Berg3017b802007-08-28 17:01:53 -0400939
Johannes Bergd4e46a32007-09-14 11:10:24 -0400940 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
Johannes Berg3017b802007-08-28 17:01:53 -0400941
942 /*
943 * RSNA-protected unicast frames should always be sent with
944 * pairwise or station-to-station keys, but for WEP we allow
945 * using a key index as well.
946 */
Johannes Berg8f20fc22007-08-28 17:01:54 -0400947 if (rx->key && rx->key->conf.alg != ALG_WEP &&
Johannes Berg3017b802007-08-28 17:01:53 -0400948 !is_multicast_ether_addr(hdr->addr1))
949 rx->key = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +0200950 }
951
Johannes Berg3017b802007-08-28 17:01:53 -0400952 if (rx->key) {
Johannes Berg571ecf62007-07-27 15:43:22 +0200953 rx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -0400954 /* TODO: add threshold stuff again */
Johannes Berg1990af82007-09-26 17:53:15 +0200955 } else {
Johannes Berge4c26ad2008-01-31 19:48:21 +0100956 return RX_DROP_MONITOR;
Johannes Berg70f08762007-09-26 17:53:14 +0200957 }
958
Zhu Yi39184b12010-04-08 15:35:10 +0800959 if (skb_linearize(rx->skb))
960 return RX_DROP_UNUSABLE;
Johannes Berg761ab472010-05-28 14:24:19 +0200961 /* the hdr variable is invalid now! */
Johannes Berg1990af82007-09-26 17:53:15 +0200962
Johannes Berg70f08762007-09-26 17:53:14 +0200963 switch (rx->key->conf.alg) {
964 case ALG_WEP:
Johannes Berg761ab472010-05-28 14:24:19 +0200965 /* Check for weak IVs if possible */
966 if (rx->sta && ieee80211_is_data(fc) &&
967 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
968 !(status->flag & RX_FLAG_DECRYPTED)) &&
969 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
970 rx->sta->wep_weak_iv_count++;
971
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200972 result = ieee80211_crypto_wep_decrypt(rx);
973 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200974 case ALG_TKIP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200975 result = ieee80211_crypto_tkip_decrypt(rx);
976 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200977 case ALG_CCMP:
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200978 result = ieee80211_crypto_ccmp_decrypt(rx);
979 break;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200980 case ALG_AES_CMAC:
981 result = ieee80211_crypto_aes_cmac_decrypt(rx);
982 break;
Johannes Berg70f08762007-09-26 17:53:14 +0200983 }
984
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200985 /* either the frame has been decrypted or will be dropped */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100986 status->flag |= RX_FLAG_DECRYPTED;
Mattias Nisslere2f036d2007-10-07 16:35:31 +0200987
988 return result;
Johannes Berg70f08762007-09-26 17:53:14 +0200989}
990
Kalle Valo572e0012009-02-10 17:09:31 +0200991static ieee80211_rx_result debug_noinline
992ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
993{
994 struct ieee80211_local *local;
995 struct ieee80211_hdr *hdr;
996 struct sk_buff *skb;
997
998 local = rx->local;
999 skb = rx->skb;
1000 hdr = (struct ieee80211_hdr *) skb->data;
1001
1002 if (!local->pspolling)
1003 return RX_CONTINUE;
1004
1005 if (!ieee80211_has_fromds(hdr->frame_control))
1006 /* this is not from AP */
1007 return RX_CONTINUE;
1008
1009 if (!ieee80211_is_data(hdr->frame_control))
1010 return RX_CONTINUE;
1011
1012 if (!ieee80211_has_moredata(hdr->frame_control)) {
1013 /* AP has no more frames buffered for us */
1014 local->pspolling = false;
1015 return RX_CONTINUE;
1016 }
1017
1018 /* more data bit is set, let's request a new frame from the AP */
1019 ieee80211_send_pspoll(local, rx->sdata);
1020
1021 return RX_CONTINUE;
1022}
1023
Johannes Berg133b8222008-09-16 14:18:59 +02001024static void ap_sta_ps_start(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001025{
Johannes Berg133b8222008-09-16 14:18:59 +02001026 struct ieee80211_sub_if_data *sdata = sta->sdata;
Christian Lamparter4571d3b2008-11-30 00:48:41 +01001027 struct ieee80211_local *local = sdata->local;
Joe Perches0795af52007-10-03 17:59:30 -07001028
Johannes Berg3e122be2008-07-09 14:40:34 +02001029 atomic_inc(&sdata->bss->num_sta_ps);
Johannes Bergaf818582009-11-06 11:35:50 +01001030 set_sta_flags(sta, WLAN_STA_PS_STA);
Johannes Berg12375ef2009-11-25 20:30:31 +01001031 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001032#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001033 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001034 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001035#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1036}
1037
Johannes Bergff9458d2009-10-30 12:56:02 +01001038static void ap_sta_ps_end(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001039{
Johannes Berg133b8222008-09-16 14:18:59 +02001040 struct ieee80211_sub_if_data *sdata = sta->sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02001041
Johannes Berg3e122be2008-07-09 14:40:34 +02001042 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg004c8722008-02-20 11:21:35 +01001043
Johannes Bergaf818582009-11-06 11:35:50 +01001044 clear_sta_flags(sta, WLAN_STA_PS_STA);
Johannes Berg004c8722008-02-20 11:21:35 +01001045
Johannes Berg571ecf62007-07-27 15:43:22 +02001046#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -07001047 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001048 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001049#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg004c8722008-02-20 11:21:35 +01001050
Johannes Bergaf818582009-11-06 11:35:50 +01001051 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001052#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Bergaf818582009-11-06 11:35:50 +01001053 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001054 sdata->name, sta->sta.addr, sta->sta.aid);
Johannes Berg571ecf62007-07-27 15:43:22 +02001055#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Bergaf818582009-11-06 11:35:50 +01001056 return;
1057 }
1058
1059 ieee80211_sta_ps_deliver_wakeup(sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001060}
1061
Johannes Berg49461622008-06-30 15:10:45 +02001062static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001063ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001064{
1065 struct sta_info *sta = rx->sta;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001066 struct sk_buff *skb = rx->skb;
1067 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1068 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001069
1070 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001071 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001072
Johannes Bergb291ba12009-07-10 15:29:03 +02001073 /*
1074 * Update last_rx only for IBSS packets which are for the current
1075 * BSSID to avoid keeping the current IBSS network alive in cases
1076 * where other STAs start using different BSSID.
1077 */
Johannes Berg05c914f2008-09-11 00:01:58 +02001078 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001079 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +02001080 NL80211_IFTYPE_ADHOC);
Johannes Berg46900292009-02-15 12:44:28 +01001081 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
Johannes Berg571ecf62007-07-27 15:43:22 +02001082 sta->last_rx = jiffies;
Johannes Bergb291ba12009-07-10 15:29:03 +02001083 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1084 /*
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001085 * Mesh beacons will update last_rx when if they are found to
1086 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +02001087 */
Johannes Bergb291ba12009-07-10 15:29:03 +02001088 sta->last_rx = jiffies;
Johannes Berg571ecf62007-07-27 15:43:22 +02001089 }
1090
Johannes Berg5cf121c2008-02-25 16:27:43 +01001091 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001092 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001093
Kalle Valo3cf335d2009-03-22 21:57:06 +02001094 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1095 ieee80211_sta_rx_notify(rx->sdata, hdr);
1096
Johannes Berg571ecf62007-07-27 15:43:22 +02001097 sta->rx_fragments++;
1098 sta->rx_bytes += rx->skb->len;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001099 sta->last_signal = status->signal;
Johannes Berg571ecf62007-07-27 15:43:22 +02001100
Johannes Berg72eaa432008-11-26 15:02:58 +01001101 /*
1102 * Change STA power saving mode only at the end of a frame
1103 * exchange sequence.
1104 */
Johannes Berg3e122be2008-07-09 14:40:34 +02001105 if (!ieee80211_has_morefrags(hdr->frame_control) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001106 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1107 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
Johannes Bergaf818582009-11-06 11:35:50 +01001108 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
Johannes Berg72eaa432008-11-26 15:02:58 +01001109 /*
1110 * Ignore doze->wake transitions that are
1111 * indicated by non-data frames, the standard
1112 * is unclear here, but for example going to
1113 * PS mode and then scanning would cause a
1114 * doze->wake transition for the probe request,
1115 * and that is clearly undesirable.
1116 */
1117 if (ieee80211_is_data(hdr->frame_control) &&
1118 !ieee80211_has_pm(hdr->frame_control))
Johannes Bergff9458d2009-10-30 12:56:02 +01001119 ap_sta_ps_end(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001120 } else {
1121 if (ieee80211_has_pm(hdr->frame_control))
1122 ap_sta_ps_start(sta);
1123 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001124 }
1125
Johannes Berg22403de2009-10-30 12:55:03 +01001126 /*
1127 * Drop (qos-)data::nullfunc frames silently, since they
1128 * are used only to control station power saving mode.
1129 */
1130 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1131 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001132 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
Felix Fietkaud5242152010-01-08 18:06:26 +01001133
1134 /*
1135 * If we receive a 4-addr nullfunc frame from a STA
1136 * that was not moved to a 4-addr STA vlan yet, drop
1137 * the frame to the monitor interface, to make sure
1138 * that hostapd sees it
1139 */
1140 if (ieee80211_has_a4(hdr->frame_control) &&
1141 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1142 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1143 !rx->sdata->u.vlan.sta)))
1144 return RX_DROP_MONITOR;
Johannes Berg22403de2009-10-30 12:55:03 +01001145 /*
1146 * Update counter and free packet here to avoid
1147 * counting this as a dropped packed.
1148 */
Johannes Berg571ecf62007-07-27 15:43:22 +02001149 sta->rx_packets++;
1150 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001151 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001152 }
1153
Johannes Berg9ae54c82008-01-31 19:48:20 +01001154 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001155} /* ieee80211_rx_h_sta_process */
1156
Johannes Berg571ecf62007-07-27 15:43:22 +02001157static inline struct ieee80211_fragment_entry *
1158ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1159 unsigned int frag, unsigned int seq, int rx_queue,
1160 struct sk_buff **skb)
1161{
1162 struct ieee80211_fragment_entry *entry;
1163 int idx;
1164
1165 idx = sdata->fragment_next;
1166 entry = &sdata->fragments[sdata->fragment_next++];
1167 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1168 sdata->fragment_next = 0;
1169
1170 if (!skb_queue_empty(&entry->skb_list)) {
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001171#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg571ecf62007-07-27 15:43:22 +02001172 struct ieee80211_hdr *hdr =
1173 (struct ieee80211_hdr *) entry->skb_list.next->data;
1174 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1175 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
Johannes Berg0c68ae262008-10-27 15:56:10 -07001176 "addr1=%pM addr2=%pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001177 sdata->name, idx,
Johannes Berg571ecf62007-07-27 15:43:22 +02001178 jiffies - entry->first_frag_time, entry->seq,
Johannes Berg0c68ae262008-10-27 15:56:10 -07001179 entry->last_frag, hdr->addr1, hdr->addr2);
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001180#endif
Johannes Berg571ecf62007-07-27 15:43:22 +02001181 __skb_queue_purge(&entry->skb_list);
1182 }
1183
1184 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1185 *skb = NULL;
1186 entry->first_frag_time = jiffies;
1187 entry->seq = seq;
1188 entry->rx_queue = rx_queue;
1189 entry->last_frag = frag;
1190 entry->ccmp = 0;
1191 entry->extra_len = 0;
1192
1193 return entry;
1194}
1195
1196static inline struct ieee80211_fragment_entry *
1197ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001198 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +02001199 int rx_queue, struct ieee80211_hdr *hdr)
1200{
1201 struct ieee80211_fragment_entry *entry;
1202 int i, idx;
1203
1204 idx = sdata->fragment_next;
1205 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1206 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +02001207
1208 idx--;
1209 if (idx < 0)
1210 idx = IEEE80211_FRAGMENT_MAX - 1;
1211
1212 entry = &sdata->fragments[idx];
1213 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1214 entry->rx_queue != rx_queue ||
1215 entry->last_frag + 1 != frag)
1216 continue;
1217
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001218 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001219
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001220 /*
1221 * Check ftype and addresses are equal, else check next fragment
1222 */
1223 if (((hdr->frame_control ^ f_hdr->frame_control) &
1224 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001225 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1226 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1227 continue;
1228
S.Çağlar Onurab466232008-02-14 17:36:47 +02001229 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001230 __skb_queue_purge(&entry->skb_list);
1231 continue;
1232 }
1233 return entry;
1234 }
1235
1236 return NULL;
1237}
1238
Johannes Berg49461622008-06-30 15:10:45 +02001239static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001240ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001241{
1242 struct ieee80211_hdr *hdr;
1243 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001244 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001245 unsigned int frag, seq;
1246 struct ieee80211_fragment_entry *entry;
1247 struct sk_buff *skb;
1248
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001249 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001250 fc = hdr->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02001251 sc = le16_to_cpu(hdr->seq_ctrl);
1252 frag = sc & IEEE80211_SCTL_FRAG;
1253
Harvey Harrison358c8d92008-07-15 18:44:13 -07001254 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
Johannes Berg571ecf62007-07-27 15:43:22 +02001255 (rx->skb)->len < 24 ||
1256 is_multicast_ether_addr(hdr->addr1))) {
1257 /* not fragmented */
1258 goto out;
1259 }
1260 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1261
Zhu Yie3cf8b32010-03-29 17:35:07 +08001262 if (skb_linearize(rx->skb))
1263 return RX_DROP_UNUSABLE;
1264
Abhijeet Kolekar058897a2010-05-11 11:22:11 -07001265 /*
1266 * skb_linearize() might change the skb->data and
1267 * previously cached variables (in this case, hdr) need to
1268 * be refreshed with the new data.
1269 */
1270 hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001271 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1272
1273 if (frag == 0) {
1274 /* This is the first fragment of a new frame. */
1275 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001276 rx->queue, &(rx->skb));
Johannes Berg8f20fc22007-08-28 17:01:54 -04001277 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
Harvey Harrison358c8d92008-07-15 18:44:13 -07001278 ieee80211_has_protected(fc)) {
Jouni Malinen91902522010-06-11 10:27:33 -07001279 int queue = ieee80211_is_mgmt(fc) ?
1280 NUM_RX_DATA_QUEUES : rx->queue;
Johannes Berg571ecf62007-07-27 15:43:22 +02001281 /* Store CCMP PN so that we can verify that the next
1282 * fragment has a sequential PN value. */
1283 entry->ccmp = 1;
1284 memcpy(entry->last_pn,
Jouni Malinen91902522010-06-11 10:27:33 -07001285 rx->key->u.ccmp.rx_pn[queue],
Johannes Berg571ecf62007-07-27 15:43:22 +02001286 CCMP_PN_LEN);
1287 }
Johannes Berg9ae54c82008-01-31 19:48:20 +01001288 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001289 }
1290
1291 /* This is a fragment for a frame that should already be pending in
1292 * fragment cache. Add this fragment to the end of the pending entry.
1293 */
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001294 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001295 if (!entry) {
1296 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001297 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001298 }
1299
1300 /* Verify that MPDUs within one MSDU have sequential PN values.
1301 * (IEEE 802.11i, 8.3.3.4.5) */
1302 if (entry->ccmp) {
1303 int i;
1304 u8 pn[CCMP_PN_LEN], *rpn;
Jouni Malinen91902522010-06-11 10:27:33 -07001305 int queue;
Johannes Berg8f20fc22007-08-28 17:01:54 -04001306 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
Johannes Berge4c26ad2008-01-31 19:48:21 +01001307 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001308 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1309 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1310 pn[i]++;
1311 if (pn[i])
1312 break;
1313 }
Jouni Malinen91902522010-06-11 10:27:33 -07001314 queue = ieee80211_is_mgmt(fc) ?
1315 NUM_RX_DATA_QUEUES : rx->queue;
1316 rpn = rx->key->u.ccmp.rx_pn[queue];
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001317 if (memcmp(pn, rpn, CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001318 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001319 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1320 }
1321
Harvey Harrison358c8d92008-07-15 18:44:13 -07001322 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +02001323 __skb_queue_tail(&entry->skb_list, rx->skb);
1324 entry->last_frag = frag;
1325 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001326 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001327 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001328 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001329 }
1330
1331 rx->skb = __skb_dequeue(&entry->skb_list);
1332 if (skb_tailroom(rx->skb) < entry->extra_len) {
1333 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1334 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1335 GFP_ATOMIC))) {
1336 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1337 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001338 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001339 }
1340 }
1341 while ((skb = __skb_dequeue(&entry->skb_list))) {
1342 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1343 dev_kfree_skb(skb);
1344 }
1345
1346 /* Complete frame has been reassembled - process it now */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001347 rx->flags |= IEEE80211_RX_FRAGMENTED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001348
1349 out:
1350 if (rx->sta)
1351 rx->sta->rx_packets++;
1352 if (is_multicast_ether_addr(hdr->addr1))
1353 rx->local->dot11MulticastReceivedFrameCount++;
1354 else
1355 ieee80211_led_rx(rx->local);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001356 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001357}
1358
Johannes Berg49461622008-06-30 15:10:45 +02001359static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001360ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001361{
Johannes Bergaf818582009-11-06 11:35:50 +01001362 struct ieee80211_sub_if_data *sdata = rx->sdata;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001363 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02001364
Harvey Harrison358c8d92008-07-15 18:44:13 -07001365 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
Johannes Berg5cf121c2008-02-25 16:27:43 +01001366 !(rx->flags & IEEE80211_RX_RA_MATCH)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001367 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001368
Johannes Berg05c914f2008-09-11 00:01:58 +02001369 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1370 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001371 return RX_DROP_UNUSABLE;
Ron Rindjunsky98f0b0a2007-12-18 17:23:53 +02001372
Johannes Bergaf818582009-11-06 11:35:50 +01001373 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1374 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1375 else
1376 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
Johannes Berg571ecf62007-07-27 15:43:22 +02001377
Johannes Berg9ae54c82008-01-31 19:48:20 +01001378 /* Free PS Poll skb here instead of returning RX_DROP that would
Johannes Berg571ecf62007-07-27 15:43:22 +02001379 * count as an dropped frame. */
1380 dev_kfree_skb(rx->skb);
1381
Johannes Berg9ae54c82008-01-31 19:48:20 +01001382 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001383}
1384
Johannes Berg49461622008-06-30 15:10:45 +02001385static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001386ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +02001387{
Johannes Berg6e0d1142007-07-27 15:43:22 +02001388 u8 *data = rx->skb->data;
Harvey Harrison238f74a2008-07-02 11:05:34 -07001389 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001390
Harvey Harrison238f74a2008-07-02 11:05:34 -07001391 if (!ieee80211_is_data_qos(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001392 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001393
1394 /* remove the qos control field, update frame type and meta-data */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001395 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1396 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1397 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001398 /* change frame type to non QOS */
Harvey Harrison238f74a2008-07-02 11:05:34 -07001399 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
Johannes Berg6e0d1142007-07-27 15:43:22 +02001400
Johannes Berg9ae54c82008-01-31 19:48:20 +01001401 return RX_CONTINUE;
Johannes Berg6e0d1142007-07-27 15:43:22 +02001402}
1403
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001404static int
Johannes Berg5cf121c2008-02-25 16:27:43 +01001405ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001406{
Johannes Berg07346f812008-05-03 01:02:02 +02001407 if (unlikely(!rx->sta ||
Johannes Bergf4ea83d2008-06-30 15:10:46 +02001408 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001409 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001410
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001411 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001412}
1413
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001414static int
Harvey Harrison358c8d92008-07-15 18:44:13 -07001415ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02001416{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001417 struct sk_buff *skb = rx->skb;
1418 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1419
Johannes Berg3017b802007-08-28 17:01:53 -04001420 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001421 * Pass through unencrypted frames if the hardware has
1422 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001423 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001424 if (status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001425 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001426
1427 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001428 if (unlikely(!ieee80211_has_protected(fc) &&
1429 !ieee80211_is_nullfunc(fc) &&
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001430 ieee80211_is_data(fc) &&
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +02001431 (rx->key || rx->sdata->drop_unencrypted)))
1432 return -EACCES;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001433
1434 return 0;
1435}
1436
1437static int
1438ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1439{
1440 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Jouni Malinene3efca02010-03-28 22:31:15 -07001441 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001442 __le16 fc = hdr->frame_control;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001443
Jouni Malinene3efca02010-03-28 22:31:15 -07001444 /*
1445 * Pass through unencrypted frames if the hardware has
1446 * decrypted them already.
1447 */
1448 if (status->flag & RX_FLAG_DECRYPTED)
1449 return 0;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001450
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001451 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
Jouni Malinend211e902010-03-28 22:29:52 -07001452 if (unlikely(!ieee80211_has_protected(fc) &&
1453 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001454 rx->key))
1455 return -EACCES;
1456 /* BIP does not use Protected field, so need to check MMIE */
Joe Perchesf64f9e72009-11-29 16:55:45 -08001457 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinenfa83a212010-03-29 23:36:15 -07001458 ieee80211_get_mmie_keyidx(rx->skb) < 0))
Jouni Malinenf2ca3ea42009-05-08 12:36:03 +03001459 return -EACCES;
1460 /*
1461 * When using MFP, Action frames are not allowed prior to
1462 * having configured keys.
1463 */
1464 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1465 ieee80211_is_robust_mgmt_frame(
1466 (struct ieee80211_hdr *) rx->skb->data)))
1467 return -EACCES;
1468 }
Johannes Bergb3fc9c62008-04-13 10:12:47 +02001469
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001470 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001471}
1472
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001473static int
Zhu Yie31a16d2009-05-21 21:47:03 +08001474__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001475{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001476 struct ieee80211_sub_if_data *sdata = rx->sdata;
Felix Fietkauf14543e2009-11-10 20:10:05 +01001477 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1478
Johannes Berg9bc383d2009-11-19 11:55:19 +01001479 if (ieee80211_has_a4(hdr->frame_control) &&
1480 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
Felix Fietkauf14543e2009-11-10 20:10:05 +01001481 return -1;
Johannes Berg9bc383d2009-11-19 11:55:19 +01001482
1483 if (is_multicast_ether_addr(hdr->addr1) &&
1484 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1485 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
Felix Fietkauf14543e2009-11-10 20:10:05 +01001486 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02001487
Johannes Berg47846c92009-11-25 17:46:19 +01001488 return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001489}
Johannes Berg571ecf62007-07-27 15:43:22 +02001490
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001491/*
1492 * requires that rx->skb is a frame with ethernet header
1493 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001494static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001495{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05301496 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001497 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1498 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1499
1500 /*
1501 * Allow EAPOL frames to us/the PAE group address regardless
1502 * of whether the frame was encrypted or not.
1503 */
1504 if (ehdr->h_proto == htons(ETH_P_PAE) &&
Johannes Berg47846c92009-11-25 17:46:19 +01001505 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001506 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1507 return true;
1508
1509 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07001510 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001511 return false;
1512
1513 return true;
1514}
1515
1516/*
1517 * requires that rx->skb is a frame with ethernet header
1518 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001519static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01001520ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001521{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001522 struct ieee80211_sub_if_data *sdata = rx->sdata;
1523 struct net_device *dev = sdata->dev;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001524 struct sk_buff *skb, *xmit_skb;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001525 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1526 struct sta_info *dsta;
Johannes Berg571ecf62007-07-27 15:43:22 +02001527
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001528 skb = rx->skb;
1529 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02001530
Johannes Berg05c914f2008-09-11 00:01:58 +02001531 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1532 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02001533 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg9bc383d2009-11-19 11:55:19 +01001534 (rx->flags & IEEE80211_RX_RA_MATCH) &&
1535 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001536 if (is_multicast_ether_addr(ehdr->h_dest)) {
1537 /*
1538 * send multicast frames both to higher layers in
1539 * local net stack and back to the wireless medium
1540 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001541 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1542 if (!xmit_skb && net_ratelimit())
Johannes Berg571ecf62007-07-27 15:43:22 +02001543 printk(KERN_DEBUG "%s: failed to clone "
1544 "multicast frame\n", dev->name);
1545 } else {
Johannes Bergabe60632009-11-25 17:46:18 +01001546 dsta = sta_info_get(sdata, skb->data);
1547 if (dsta) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001548 /*
1549 * The destination station is associated to
1550 * this AP (in this VLAN), so send the frame
1551 * directly to it and do not pass it to local
1552 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02001553 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001554 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02001555 skb = NULL;
1556 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001557 }
1558 }
1559
1560 if (skb) {
Johannes Bergd1c3a372009-01-07 00:26:10 +01001561 int align __maybe_unused;
1562
Kalle Valo59d9cb02009-12-17 13:54:57 +01001563#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
Johannes Bergd1c3a372009-01-07 00:26:10 +01001564 /*
1565 * 'align' will only take the values 0 or 2 here
1566 * since all frames are required to be aligned
1567 * to 2-byte boundaries when being passed to
1568 * mac80211. That also explains the __skb_push()
1569 * below.
1570 */
matthieu castetdacb6f12009-06-04 22:16:18 +02001571 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01001572 if (align) {
1573 if (WARN_ON(skb_headroom(skb) < 3)) {
1574 dev_kfree_skb(skb);
1575 skb = NULL;
1576 } else {
1577 u8 *data = skb->data;
Zhu Yi8ce0b582009-10-28 13:13:52 -07001578 size_t len = skb_headlen(skb);
1579 skb->data -= align;
1580 memmove(skb->data, data, len);
1581 skb_set_tail_pointer(skb, len);
Johannes Bergd1c3a372009-01-07 00:26:10 +01001582 }
1583 }
1584#endif
1585
1586 if (skb) {
1587 /* deliver to local stack */
1588 skb->protocol = eth_type_trans(skb, dev);
1589 memset(skb->cb, 0, sizeof(skb->cb));
John W. Linville5548a8a2010-06-24 14:25:56 -04001590 netif_receive_skb(skb);
Johannes Bergd1c3a372009-01-07 00:26:10 +01001591 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001592 }
1593
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001594 if (xmit_skb) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001595 /* send to wireless media */
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09001596 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001597 skb_reset_network_header(xmit_skb);
1598 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001599 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001600 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001601}
1602
Johannes Berg49461622008-06-30 15:10:45 +02001603static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001604ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001605{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001606 struct net_device *dev = rx->sdata->dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001607 struct sk_buff *skb = rx->skb;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001608 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1609 __le16 fc = hdr->frame_control;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001610 struct sk_buff_head frame_list;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001611
Harvey Harrison358c8d92008-07-15 18:44:13 -07001612 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001613 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001614
Harvey Harrison358c8d92008-07-15 18:44:13 -07001615 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001616 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001617
Johannes Berg5cf121c2008-02-25 16:27:43 +01001618 if (!(rx->flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001619 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001620
Zhu Yieaf85ca2009-12-01 10:18:37 +08001621 if (ieee80211_has_a4(hdr->frame_control) &&
1622 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1623 !rx->sdata->u.vlan.sta)
1624 return RX_DROP_UNUSABLE;
1625
1626 if (is_multicast_ether_addr(hdr->addr1) &&
1627 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1628 rx->sdata->u.vlan.sta) ||
1629 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1630 rx->sdata->u.mgd.use_4addr)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001631 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001632
1633 skb->dev = dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08001634 __skb_queue_head_init(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001635
Zhu Yie3cf8b32010-03-29 17:35:07 +08001636 if (skb_linearize(skb))
1637 return RX_DROP_UNUSABLE;
1638
Zhu Yieaf85ca2009-12-01 10:18:37 +08001639 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1640 rx->sdata->vif.type,
1641 rx->local->hw.extra_tx_headroom);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001642
Zhu Yieaf85ca2009-12-01 10:18:37 +08001643 while (!skb_queue_empty(&frame_list)) {
1644 rx->skb = __skb_dequeue(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001645
Harvey Harrison358c8d92008-07-15 18:44:13 -07001646 if (!ieee80211_frame_allowed(rx, fc)) {
Zhu Yieaf85ca2009-12-01 10:18:37 +08001647 dev_kfree_skb(rx->skb);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001648 continue;
1649 }
Zhu Yieaf85ca2009-12-01 10:18:37 +08001650 dev->stats.rx_packets++;
1651 dev->stats.rx_bytes += rx->skb->len;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001652
1653 ieee80211_deliver_skb(rx);
1654 }
1655
Johannes Berg9ae54c82008-01-31 19:48:20 +01001656 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02001657}
1658
Ingo Molnarbf94e172008-10-12 23:51:38 -07001659#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02001660static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001661ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1662{
1663 struct ieee80211_hdr *hdr;
1664 struct ieee80211s_hdr *mesh_hdr;
1665 unsigned int hdrlen;
1666 struct sk_buff *skb = rx->skb, *fwd_skb;
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001667 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001668 struct ieee80211_sub_if_data *sdata = rx->sdata;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001669
1670 hdr = (struct ieee80211_hdr *) skb->data;
1671 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1672 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1673
1674 if (!ieee80211_is_data(hdr->frame_control))
1675 return RX_CONTINUE;
1676
1677 if (!mesh_hdr->ttl)
1678 /* illegal frame */
1679 return RX_DROP_MONITOR;
1680
Javier Cardona43b7b312009-10-15 18:10:51 -07001681 if (mesh_hdr->flags & MESH_FLAGS_AE) {
YanBo79617de2008-09-22 13:30:32 +08001682 struct mesh_path *mppath;
Javier Cardona43b7b312009-10-15 18:10:51 -07001683 char *proxied_addr;
1684 char *mpp_addr;
1685
1686 if (is_multicast_ether_addr(hdr->addr1)) {
1687 mpp_addr = hdr->addr3;
1688 proxied_addr = mesh_hdr->eaddr1;
1689 } else {
1690 mpp_addr = hdr->addr4;
1691 proxied_addr = mesh_hdr->eaddr2;
1692 }
YanBo79617de2008-09-22 13:30:32 +08001693
YanBo79617de2008-09-22 13:30:32 +08001694 rcu_read_lock();
Javier Cardona43b7b312009-10-15 18:10:51 -07001695 mppath = mpp_path_lookup(proxied_addr, sdata);
YanBo79617de2008-09-22 13:30:32 +08001696 if (!mppath) {
Javier Cardona43b7b312009-10-15 18:10:51 -07001697 mpp_path_add(proxied_addr, mpp_addr, sdata);
YanBo79617de2008-09-22 13:30:32 +08001698 } else {
1699 spin_lock_bh(&mppath->state_lock);
Javier Cardona43b7b312009-10-15 18:10:51 -07001700 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1701 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
YanBo79617de2008-09-22 13:30:32 +08001702 spin_unlock_bh(&mppath->state_lock);
1703 }
1704 rcu_read_unlock();
1705 }
1706
Javier Cardona3c5772a2009-08-10 12:15:48 -07001707 /* Frame has reached destination. Don't forward */
1708 if (!is_multicast_ether_addr(hdr->addr1) &&
Johannes Berg47846c92009-11-25 17:46:19 +01001709 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001710 return RX_CONTINUE;
1711
1712 mesh_hdr->ttl--;
1713
1714 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1715 if (!mesh_hdr->ttl)
Johannes Berg472dbc42008-09-11 00:01:49 +02001716 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001717 dropped_frames_ttl);
1718 else {
1719 struct ieee80211_hdr *fwd_hdr;
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001720 struct ieee80211_tx_info *info;
1721
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001722 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1723
1724 if (!fwd_skb && net_ratelimit())
1725 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
Johannes Berg47846c92009-11-25 17:46:19 +01001726 sdata->name);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001727
1728 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
Johannes Berg47846c92009-11-25 17:46:19 +01001729 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001730 info = IEEE80211_SKB_CB(fwd_skb);
1731 memset(info, 0, sizeof(*info));
1732 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
Johannes Berg5061b0c2009-07-14 00:33:34 +02001733 info->control.vif = &rx->sdata->vif;
Johannes Bergcf0277e2010-01-05 18:00:58 +01001734 skb_set_queue_mapping(skb,
1735 ieee80211_select_queue(rx->sdata, fwd_skb));
1736 ieee80211_set_qos_hdr(local, skb);
Daniel Walkerc8a61a72009-08-18 10:59:00 -07001737 if (is_multicast_ether_addr(fwd_hdr->addr1))
1738 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1739 fwded_mcast);
1740 else {
Javier Cardona3c5772a2009-08-10 12:15:48 -07001741 int err;
1742 /*
1743 * Save TA to addr1 to send TA a path error if a
1744 * suitable next hop is not found
1745 */
1746 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
Javier Cardona249b4052009-07-07 10:55:03 -07001747 ETH_ALEN);
Javier Cardona3c5772a2009-08-10 12:15:48 -07001748 err = mesh_nexthop_lookup(fwd_skb, sdata);
Javier Cardona249b4052009-07-07 10:55:03 -07001749 /* Failed to immediately resolve next hop:
1750 * fwded frame was dropped or will be added
1751 * later to the pending skb queue. */
1752 if (err)
1753 return RX_DROP_MONITOR;
Daniel Walkerc8a61a72009-08-18 10:59:00 -07001754
1755 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1756 fwded_unicast);
Javier Cardona249b4052009-07-07 10:55:03 -07001757 }
1758 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1759 fwded_frames);
Johannes Berg3b8d81e2009-06-17 17:43:56 +02001760 ieee80211_add_pending_skb(local, fwd_skb);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001761 }
1762 }
1763
Javier Cardona3c5772a2009-08-10 12:15:48 -07001764 if (is_multicast_ether_addr(hdr->addr1) ||
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001765 sdata->dev->flags & IFF_PROMISC)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001766 return RX_CONTINUE;
1767 else
1768 return RX_DROP_MONITOR;
1769}
Ingo Molnarbf94e172008-10-12 23:51:38 -07001770#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001771
1772static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001773ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001774{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001775 struct ieee80211_sub_if_data *sdata = rx->sdata;
Vivek Natarajane15276a2010-02-08 17:47:01 +05301776 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001777 struct net_device *dev = sdata->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001778 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1779 __le16 fc = hdr->frame_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001780 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001781
Harvey Harrison358c8d92008-07-15 18:44:13 -07001782 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001783 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001784
Harvey Harrison358c8d92008-07-15 18:44:13 -07001785 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001786 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001787
Felix Fietkauf14543e2009-11-10 20:10:05 +01001788 /*
1789 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1790 * that a 4-addr station can be detected and moved into a separate VLAN
1791 */
1792 if (ieee80211_has_a4(hdr->frame_control) &&
1793 sdata->vif.type == NL80211_IFTYPE_AP)
1794 return RX_DROP_MONITOR;
1795
Zhu Yie31a16d2009-05-21 21:47:03 +08001796 err = __ieee80211_data_to_8023(rx);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001797 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001798 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001799
Harvey Harrison358c8d92008-07-15 18:44:13 -07001800 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001801 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001802
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001803 rx->skb->dev = dev;
1804
1805 dev->stats.rx_packets++;
1806 dev->stats.rx_bytes += rx->skb->len;
1807
Vivek Natarajane15276a2010-02-08 17:47:01 +05301808 if (ieee80211_is_data(hdr->frame_control) &&
1809 !is_multicast_ether_addr(hdr->addr1) &&
1810 local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) {
1811 mod_timer(&local->dynamic_ps_timer, jiffies +
1812 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1813 }
1814
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001815 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02001816
Johannes Berg9ae54c82008-01-31 19:48:20 +01001817 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001818}
1819
Johannes Berg49461622008-06-30 15:10:45 +02001820static ieee80211_rx_result debug_noinline
Johannes Berg2569a822009-11-25 17:46:17 +01001821ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
Ron Rindjunsky71364712007-12-25 17:00:36 +02001822{
1823 struct ieee80211_local *local = rx->local;
1824 struct ieee80211_hw *hw = &local->hw;
1825 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07001826 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001827 struct tid_ampdu_rx *tid_agg_rx;
1828 u16 start_seq_num;
1829 u16 tid;
1830
Harvey Harrisona7767f92008-07-02 16:30:51 -07001831 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001832 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001833
Harvey Harrisona7767f92008-07-02 16:30:51 -07001834 if (ieee80211_is_back_req(bar->frame_control)) {
Johannes Berg8ae59772010-05-30 14:52:58 +02001835 struct {
1836 __le16 control, start_seq_num;
1837 } __packed bar_data;
1838
Ron Rindjunsky71364712007-12-25 17:00:36 +02001839 if (!rx->sta)
Johannes Berga02ae752009-11-16 12:00:40 +01001840 return RX_DROP_MONITOR;
Johannes Berg8ae59772010-05-30 14:52:58 +02001841
1842 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1843 &bar_data, sizeof(bar_data)))
1844 return RX_DROP_MONITOR;
1845
Johannes Berg8ae59772010-05-30 14:52:58 +02001846 tid = le16_to_cpu(bar_data.control) >> 12;
Johannes Berga87f7362010-06-10 10:21:38 +02001847
1848 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1849 if (!tid_agg_rx)
Johannes Berga02ae752009-11-16 12:00:40 +01001850 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001851
Johannes Berg8ae59772010-05-30 14:52:58 +02001852 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001853
1854 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01001855 if (tid_agg_rx->timeout)
1856 mod_timer(&tid_agg_rx->session_timer,
1857 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02001858
Johannes Berga02ae752009-11-16 12:00:40 +01001859 /* release stored frames up to start of BAR */
Johannes Berg2569a822009-11-25 17:46:17 +01001860 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1861 frames);
Johannes Berga02ae752009-11-16 12:00:40 +01001862 kfree_skb(skb);
1863 return RX_QUEUED;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001864 }
1865
Johannes Berg08daeca2010-05-30 14:53:43 +02001866 /*
1867 * After this point, we only want management frames,
1868 * so we can drop all remaining control frames to
1869 * cooked monitor interfaces.
1870 */
1871 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02001872}
1873
Jouni Malinenf4f727a2009-01-10 11:46:53 +02001874static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1875 struct ieee80211_mgmt *mgmt,
1876 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02001877{
1878 struct ieee80211_local *local = sdata->local;
1879 struct sk_buff *skb;
1880 struct ieee80211_mgmt *resp;
1881
Johannes Berg47846c92009-11-25 17:46:19 +01001882 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
Jouni Malinenfea14732009-01-08 13:32:06 +02001883 /* Not to own unicast address */
1884 return;
1885 }
1886
Johannes Berg46900292009-02-15 12:44:28 +01001887 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1888 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
Johannes Berg77fdaa12009-07-07 03:45:17 +02001889 /* Not from the current AP or not associated yet. */
Jouni Malinenfea14732009-01-08 13:32:06 +02001890 return;
1891 }
1892
1893 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1894 /* Too short SA Query request frame */
1895 return;
1896 }
1897
1898 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1899 if (skb == NULL)
1900 return;
1901
1902 skb_reserve(skb, local->hw.extra_tx_headroom);
1903 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1904 memset(resp, 0, 24);
1905 memcpy(resp->da, mgmt->sa, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01001906 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01001907 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02001908 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1909 IEEE80211_STYPE_ACTION);
1910 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1911 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1912 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1913 memcpy(resp->u.action.u.sa_query.trans_id,
1914 mgmt->u.action.u.sa_query.trans_id,
1915 WLAN_SA_QUERY_TR_ID_LEN);
1916
Johannes Berg62ae67b2009-11-18 18:42:05 +01001917 ieee80211_tx_skb(sdata, skb);
Jouni Malinenfea14732009-01-08 13:32:06 +02001918}
1919
Johannes Berg49461622008-06-30 15:10:45 +02001920static ieee80211_rx_result debug_noinline
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001921ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1922{
1923 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001924 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001925 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg84040802010-02-15 12:46:39 +02001926 struct sk_buff *nskb;
Jouni Malinen026331c2010-02-15 12:53:10 +02001927 struct ieee80211_rx_status *status;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001928 int len = rx->skb->len;
1929
1930 if (!ieee80211_is_action(mgmt->frame_control))
1931 return RX_CONTINUE;
1932
Jouni Malinen026331c2010-02-15 12:53:10 +02001933 /* drop too small frames */
1934 if (len < IEEE80211_MIN_ACTION_SIZE)
1935 return RX_DROP_UNUSABLE;
1936
1937 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
Johannes Berg84040802010-02-15 12:46:39 +02001938 return RX_DROP_UNUSABLE;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001939
1940 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berg84040802010-02-15 12:46:39 +02001941 return RX_DROP_UNUSABLE;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001942
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001943 if (ieee80211_drop_unencrypted_mgmt(rx))
Johannes Berg84040802010-02-15 12:46:39 +02001944 return RX_DROP_UNUSABLE;
Jouni Malinen97ebe122009-01-08 13:32:08 +02001945
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001946 switch (mgmt->u.action.category) {
1947 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01001948 /*
1949 * The aggregation code is not prepared to handle
1950 * anything but STA/AP due to the BSSID handling;
1951 * IBSS could work in the code but isn't supported
1952 * by drivers or the standard.
1953 */
1954 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1955 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1956 sdata->vif.type != NL80211_IFTYPE_AP)
Johannes Berg84040802010-02-15 12:46:39 +02001957 break;
Johannes Berg8abd3f92009-02-10 21:25:47 +01001958
Jouni Malinen026331c2010-02-15 12:53:10 +02001959 /* verify action_code is present */
1960 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1961 break;
1962
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001963 switch (mgmt->u.action.u.addba_req.action_code) {
1964 case WLAN_ACTION_ADDBA_REQ:
1965 if (len < (IEEE80211_MIN_ACTION_SIZE +
1966 sizeof(mgmt->u.action.u.addba_req)))
Johannes Bergbed7ee62010-06-10 10:21:35 +02001967 goto invalid;
1968 break;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001969 case WLAN_ACTION_ADDBA_RESP:
1970 if (len < (IEEE80211_MIN_ACTION_SIZE +
1971 sizeof(mgmt->u.action.u.addba_resp)))
Johannes Bergbed7ee62010-06-10 10:21:35 +02001972 goto invalid;
1973 break;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001974 case WLAN_ACTION_DELBA:
1975 if (len < (IEEE80211_MIN_ACTION_SIZE +
1976 sizeof(mgmt->u.action.u.delba)))
Johannes Bergbed7ee62010-06-10 10:21:35 +02001977 goto invalid;
1978 break;
1979 default:
1980 goto invalid;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02001981 }
Johannes Bergbed7ee62010-06-10 10:21:35 +02001982
Johannes Berg8b58ff82010-06-10 10:21:51 +02001983 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02001984 case WLAN_CATEGORY_SPECTRUM_MGMT:
1985 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
Johannes Berg84040802010-02-15 12:46:39 +02001986 break;
Johannes Berg46900292009-02-15 12:44:28 +01001987
1988 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02001989 break;
Johannes Berg46900292009-02-15 12:44:28 +01001990
Jouni Malinen026331c2010-02-15 12:53:10 +02001991 /* verify action_code is present */
1992 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1993 break;
1994
Johannes Berg39192c02008-09-09 14:49:03 +02001995 switch (mgmt->u.action.u.measurement.action_code) {
1996 case WLAN_ACTION_SPCT_MSR_REQ:
1997 if (len < (IEEE80211_MIN_ACTION_SIZE +
1998 sizeof(mgmt->u.action.u.measurement)))
Johannes Berg84040802010-02-15 12:46:39 +02001999 break;
Johannes Berg39192c02008-09-09 14:49:03 +02002000 ieee80211_process_measurement_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002001 goto handled;
Sujithc481ec92009-01-06 09:28:37 +05302002 case WLAN_ACTION_SPCT_CHL_SWITCH:
2003 if (len < (IEEE80211_MIN_ACTION_SIZE +
2004 sizeof(mgmt->u.action.u.chan_switch)))
Johannes Berg84040802010-02-15 12:46:39 +02002005 break;
Sujithc481ec92009-01-06 09:28:37 +05302006
Johannes Bergcc32abd2009-05-15 11:52:31 +02002007 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002008 break;
Johannes Bergcc32abd2009-05-15 11:52:31 +02002009
Johannes Berg46900292009-02-15 12:44:28 +01002010 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
Johannes Berg84040802010-02-15 12:46:39 +02002011 break;
Sujithc481ec92009-01-06 09:28:37 +05302012
Johannes Berg8b58ff82010-06-10 10:21:51 +02002013 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002014 }
2015 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002016 case WLAN_CATEGORY_SA_QUERY:
2017 if (len < (IEEE80211_MIN_ACTION_SIZE +
2018 sizeof(mgmt->u.action.u.sa_query)))
Johannes Berg84040802010-02-15 12:46:39 +02002019 break;
2020
Jouni Malinenfea14732009-01-08 13:32:06 +02002021 switch (mgmt->u.action.u.sa_query.action) {
2022 case WLAN_ACTION_SA_QUERY_REQUEST:
2023 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002024 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002025 ieee80211_process_sa_query_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002026 goto handled;
Jouni Malinenfea14732009-01-08 13:32:06 +02002027 }
2028 break;
Javier Cardona97ad9132010-03-29 11:00:21 -07002029 case WLAN_CATEGORY_MESH_PLINK:
2030 case WLAN_CATEGORY_MESH_PATH_SEL:
Johannes Berg77a121c2010-06-10 10:21:34 +02002031 if (!ieee80211_vif_is_mesh(&sdata->vif))
2032 break;
Johannes Berg8b58ff82010-06-10 10:21:51 +02002033 goto queue;
Johannes Berg84040802010-02-15 12:46:39 +02002034 }
Jouni Malinen026331c2010-02-15 12:53:10 +02002035
Johannes Bergbed7ee62010-06-10 10:21:35 +02002036 invalid:
Johannes Berg84040802010-02-15 12:46:39 +02002037 /*
2038 * For AP mode, hostapd is responsible for handling any action
2039 * frames that we didn't handle, including returning unknown
2040 * ones. For all other modes we will return them to the sender,
2041 * setting the 0x80 bit in the action category, as required by
2042 * 802.11-2007 7.3.1.11.
2043 */
2044 if (sdata->vif.type == NL80211_IFTYPE_AP ||
2045 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2046 return RX_DROP_MONITOR;
Felix Fietkaud7907442010-01-07 20:23:53 +01002047
Jouni Malinen026331c2010-02-15 12:53:10 +02002048 /*
2049 * Getting here means the kernel doesn't know how to handle
2050 * it, but maybe userspace does ... include returned frames
2051 * so userspace can register for those to know whether ones
2052 * it transmitted were processed or returned.
2053 */
2054 status = IEEE80211_SKB_RXCB(rx->skb);
2055
Johannes Berg9d38d852010-06-09 17:20:33 +02002056 if (cfg80211_rx_action(rx->sdata->dev, status->freq,
Jouni Malinen026331c2010-02-15 12:53:10 +02002057 rx->skb->data, rx->skb->len,
2058 GFP_ATOMIC))
2059 goto handled;
2060
Johannes Berg84040802010-02-15 12:46:39 +02002061 /* do not return rejected action frames */
2062 if (mgmt->u.action.category & 0x80)
2063 return RX_DROP_UNUSABLE;
2064
2065 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2066 GFP_ATOMIC);
2067 if (nskb) {
John W. Linville292b4df2010-06-24 11:13:56 -04002068 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
Johannes Berg84040802010-02-15 12:46:39 +02002069
John W. Linville292b4df2010-06-24 11:13:56 -04002070 nmgmt->u.action.category |= 0x80;
2071 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2072 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
Johannes Berg84040802010-02-15 12:46:39 +02002073
2074 memset(nskb->cb, 0, sizeof(nskb->cb));
2075
2076 ieee80211_tx_skb(rx->sdata, nskb);
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002077 }
2078
Johannes Berg84040802010-02-15 12:46:39 +02002079 handled:
Jouni Malinen026331c2010-02-15 12:53:10 +02002080 if (rx->sta)
2081 rx->sta->rx_packets++;
Johannes Berg39192c02008-09-09 14:49:03 +02002082 dev_kfree_skb(rx->skb);
2083 return RX_QUEUED;
Johannes Berg8b58ff82010-06-10 10:21:51 +02002084
2085 queue:
2086 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2087 skb_queue_tail(&sdata->skb_queue, rx->skb);
2088 ieee80211_queue_work(&local->hw, &sdata->work);
2089 if (rx->sta)
2090 rx->sta->rx_packets++;
2091 return RX_QUEUED;
Johannes Bergde1ede7a2008-09-09 14:42:50 +02002092}
2093
2094static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002095ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02002096{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002097 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergaf6b6372009-12-23 13:15:35 +01002098 ieee80211_rx_result rxs;
Johannes Berg77a121c2010-06-10 10:21:34 +02002099 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2100 __le16 stype;
Johannes Berg571ecf62007-07-27 15:43:22 +02002101
Johannes Berg5cf121c2008-02-25 16:27:43 +01002102 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002103 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02002104
Johannes Berg77a121c2010-06-10 10:21:34 +02002105 if (rx->skb->len < 24)
2106 return RX_DROP_MONITOR;
2107
Johannes Bergbef5d1c2010-02-16 11:05:00 +01002108 if (ieee80211_drop_unencrypted_mgmt(rx))
2109 return RX_DROP_UNUSABLE;
Jouni Malinen97ebe122009-01-08 13:32:08 +02002110
Johannes Bergaf6b6372009-12-23 13:15:35 +01002111 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2112 if (rxs != RX_CONTINUE)
2113 return rxs;
2114
Johannes Berg77a121c2010-06-10 10:21:34 +02002115 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
Johannes Berg472dbc42008-09-11 00:01:49 +02002116
Johannes Berg77a121c2010-06-10 10:21:34 +02002117 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2118 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2119 sdata->vif.type != NL80211_IFTYPE_STATION)
2120 return RX_DROP_MONITOR;
Johannes Bergf9d540e2007-09-28 14:02:09 +02002121
Johannes Berg77a121c2010-06-10 10:21:34 +02002122 switch (stype) {
2123 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2124 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2125 /* process for all: mesh, mlme, ibss */
2126 break;
2127 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2128 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2129 /* process only for station */
2130 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2131 return RX_DROP_MONITOR;
2132 break;
2133 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2134 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2135 /* process only for ibss */
2136 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2137 return RX_DROP_MONITOR;
2138 break;
2139 default:
2140 return RX_DROP_MONITOR;
2141 }
Johannes Berg46900292009-02-15 12:44:28 +01002142
Johannes Berg77a121c2010-06-10 10:21:34 +02002143 /* queue up frame and kick off work to process it */
Johannes Bergc1475ca2010-06-10 10:21:37 +02002144 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg77a121c2010-06-10 10:21:34 +02002145 skb_queue_tail(&sdata->skb_queue, rx->skb);
2146 ieee80211_queue_work(&rx->local->hw, &sdata->work);
Johannes Berg8b58ff82010-06-10 10:21:51 +02002147 if (rx->sta)
2148 rx->sta->rx_packets++;
Johannes Berg77a121c2010-06-10 10:21:34 +02002149
2150 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002151}
2152
Johannes Berg3b8d81e2009-06-17 17:43:56 +02002153static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
Johannes Berg5cf121c2008-02-25 16:27:43 +01002154 struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02002155{
Harvey Harrisona7767f92008-07-02 16:30:51 -07002156 int keyidx;
2157 unsigned int hdrlen;
Johannes Berg571ecf62007-07-27 15:43:22 +02002158
Harvey Harrisona7767f92008-07-02 16:30:51 -07002159 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg571ecf62007-07-27 15:43:22 +02002160 if (rx->skb->len >= hdrlen + 4)
2161 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2162 else
2163 keyidx = -1;
2164
Johannes Berg8944b792008-01-31 19:48:26 +01002165 if (!rx->sta) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02002166 /*
2167 * Some hardware seem to generate incorrect Michael MIC
2168 * reports; ignore them to avoid triggering countermeasures.
2169 */
Johannes Bergaf2ced62009-11-16 12:00:39 +01002170 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002171 }
2172
Harvey Harrisona7767f92008-07-02 16:30:51 -07002173 if (!ieee80211_has_protected(hdr->frame_control))
Johannes Bergaf2ced62009-11-16 12:00:39 +01002174 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002175
Johannes Berg05c914f2008-09-11 00:01:58 +02002176 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
Johannes Bergaa0daf02007-09-10 14:15:25 +02002177 /*
2178 * APs with pairwise keys should never receive Michael MIC
2179 * errors for non-zero keyidx because these are reserved for
2180 * group keys and only the AP is sending real multicast
2181 * frames in the BSS.
2182 */
Johannes Bergaf2ced62009-11-16 12:00:39 +01002183 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002184 }
2185
Harvey Harrisona7767f92008-07-02 16:30:51 -07002186 if (!ieee80211_is_data(hdr->frame_control) &&
2187 !ieee80211_is_auth(hdr->frame_control))
Johannes Bergaf2ced62009-11-16 12:00:39 +01002188 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02002189
Johannes Berge6d6e342009-07-01 21:26:47 +02002190 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2191 GFP_ATOMIC);
Johannes Berg571ecf62007-07-27 15:43:22 +02002192}
2193
Johannes Berg5cf121c2008-02-25 16:27:43 +01002194/* TODO: use IEEE80211_RX_FRAGMENTED */
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002195static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2196 struct ieee80211_rate *rate)
Michael Wu3d30d942008-01-31 19:48:27 +01002197{
2198 struct ieee80211_sub_if_data *sdata;
2199 struct ieee80211_local *local = rx->local;
2200 struct ieee80211_rtap_hdr {
2201 struct ieee80211_radiotap_header hdr;
2202 u8 flags;
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002203 u8 rate_or_pad;
Michael Wu3d30d942008-01-31 19:48:27 +01002204 __le16 chan_freq;
2205 __le16 chan_flags;
Eric Dumazetbc105022010-06-03 03:21:52 -07002206 } __packed *rthdr;
Michael Wu3d30d942008-01-31 19:48:27 +01002207 struct sk_buff *skb = rx->skb, *skb2;
2208 struct net_device *prev_dev = NULL;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002209 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Michael Wu3d30d942008-01-31 19:48:27 +01002210
Johannes Berg8c0c7092009-11-25 17:46:15 +01002211 if (status->flag & RX_FLAG_INTERNAL_CMTR)
Michael Wu3d30d942008-01-31 19:48:27 +01002212 goto out_free_skb;
2213
2214 if (skb_headroom(skb) < sizeof(*rthdr) &&
2215 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2216 goto out_free_skb;
2217
2218 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2219 memset(rthdr, 0, sizeof(*rthdr));
2220 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2221 rthdr->hdr.it_present =
2222 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
Michael Wu3d30d942008-01-31 19:48:27 +01002223 (1 << IEEE80211_RADIOTAP_CHANNEL));
2224
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002225 if (rate) {
2226 rthdr->rate_or_pad = rate->bitrate / 5;
2227 rthdr->hdr.it_present |=
2228 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2229 }
Michael Wu3d30d942008-01-31 19:48:27 +01002230 rthdr->chan_freq = cpu_to_le16(status->freq);
2231
2232 if (status->band == IEEE80211_BAND_5GHZ)
2233 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2234 IEEE80211_CHAN_5GHZ);
2235 else
2236 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2237 IEEE80211_CHAN_2GHZ);
2238
2239 skb_set_mac_header(skb, 0);
2240 skb->ip_summed = CHECKSUM_UNNECESSARY;
2241 skb->pkt_type = PACKET_OTHERHOST;
2242 skb->protocol = htons(ETH_P_802_2);
2243
2244 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01002245 if (!ieee80211_sdata_running(sdata))
Michael Wu3d30d942008-01-31 19:48:27 +01002246 continue;
2247
Johannes Berg05c914f2008-09-11 00:01:58 +02002248 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Michael Wu3d30d942008-01-31 19:48:27 +01002249 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2250 continue;
2251
2252 if (prev_dev) {
2253 skb2 = skb_clone(skb, GFP_ATOMIC);
2254 if (skb2) {
2255 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04002256 netif_receive_skb(skb2);
Michael Wu3d30d942008-01-31 19:48:27 +01002257 }
2258 }
2259
2260 prev_dev = sdata->dev;
2261 sdata->dev->stats.rx_packets++;
2262 sdata->dev->stats.rx_bytes += skb->len;
2263 }
2264
2265 if (prev_dev) {
2266 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04002267 netif_receive_skb(skb);
Michael Wu3d30d942008-01-31 19:48:27 +01002268 skb = NULL;
2269 } else
2270 goto out_free_skb;
2271
Johannes Berg8c0c7092009-11-25 17:46:15 +01002272 status->flag |= RX_FLAG_INTERNAL_CMTR;
Michael Wu3d30d942008-01-31 19:48:27 +01002273 return;
2274
2275 out_free_skb:
2276 dev_kfree_skb(skb);
2277}
2278
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002279static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2280 ieee80211_rx_result res)
2281{
2282 switch (res) {
2283 case RX_DROP_MONITOR:
2284 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2285 if (rx->sta)
2286 rx->sta->rx_dropped++;
2287 /* fall through */
2288 case RX_CONTINUE: {
2289 struct ieee80211_rate *rate = NULL;
2290 struct ieee80211_supported_band *sband;
2291 struct ieee80211_rx_status *status;
2292
2293 status = IEEE80211_SKB_RXCB((rx->skb));
2294
2295 sband = rx->local->hw.wiphy->bands[status->band];
2296 if (!(status->flag & RX_FLAG_HT))
2297 rate = &sband->bitrates[status->rate_idx];
2298
2299 ieee80211_rx_cooked_monitor(rx, rate);
2300 break;
2301 }
2302 case RX_DROP_UNUSABLE:
2303 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2304 if (rx->sta)
2305 rx->sta->rx_dropped++;
2306 dev_kfree_skb(rx->skb);
2307 break;
2308 case RX_QUEUED:
2309 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2310 break;
2311 }
2312}
2313
2314static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2315 struct sk_buff_head *frames)
2316{
2317 ieee80211_rx_result res = RX_DROP_MONITOR;
2318 struct sk_buff *skb;
2319
2320#define CALL_RXH(rxh) \
2321 do { \
2322 res = rxh(rx); \
2323 if (res != RX_CONTINUE) \
2324 goto rxh_next; \
2325 } while (0);
2326
2327 while ((skb = __skb_dequeue(frames))) {
2328 /*
2329 * all the other fields are valid across frames
2330 * that belong to an aMPDU since they are on the
2331 * same TID from the same station
2332 */
2333 rx->skb = skb;
2334
2335 CALL_RXH(ieee80211_rx_h_decrypt)
2336 CALL_RXH(ieee80211_rx_h_check_more_data)
2337 CALL_RXH(ieee80211_rx_h_sta_process)
2338 CALL_RXH(ieee80211_rx_h_defragment)
2339 CALL_RXH(ieee80211_rx_h_ps_poll)
2340 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2341 /* must be after MMIC verify so header is counted in MPDU mic */
2342 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2343 CALL_RXH(ieee80211_rx_h_amsdu)
2344#ifdef CONFIG_MAC80211_MESH
2345 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2346 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2347#endif
2348 CALL_RXH(ieee80211_rx_h_data)
2349
2350 /* special treatment -- needs the queue */
2351 res = ieee80211_rx_h_ctrl(rx, frames);
2352 if (res != RX_CONTINUE)
2353 goto rxh_next;
2354
2355 CALL_RXH(ieee80211_rx_h_action)
2356 CALL_RXH(ieee80211_rx_h_mgmt)
2357
2358 rxh_next:
2359 ieee80211_rx_handlers_result(rx, res);
2360
2361#undef CALL_RXH
2362 }
2363}
Johannes Berg571ecf62007-07-27 15:43:22 +02002364
Johannes Berg8944b792008-01-31 19:48:26 +01002365static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg5cf121c2008-02-25 16:27:43 +01002366 struct ieee80211_rx_data *rx,
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002367 struct sk_buff *skb,
2368 struct ieee80211_rate *rate)
Johannes Berg58905292008-01-31 19:48:25 +01002369{
Johannes Berg2569a822009-11-25 17:46:17 +01002370 struct sk_buff_head reorder_release;
Johannes Berg58905292008-01-31 19:48:25 +01002371 ieee80211_rx_result res = RX_DROP_MONITOR;
2372
Johannes Berg2569a822009-11-25 17:46:17 +01002373 __skb_queue_head_init(&reorder_release);
2374
Johannes Berg8944b792008-01-31 19:48:26 +01002375 rx->skb = skb;
2376 rx->sdata = sdata;
Johannes Berg8944b792008-01-31 19:48:26 +01002377
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002378#define CALL_RXH(rxh) \
2379 do { \
2380 res = rxh(rx); \
2381 if (res != RX_CONTINUE) \
Johannes Berg2569a822009-11-25 17:46:17 +01002382 goto rxh_next; \
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002383 } while (0);
Johannes Berg58905292008-01-31 19:48:25 +01002384
Johannes Berg49461622008-06-30 15:10:45 +02002385 CALL_RXH(ieee80211_rx_h_passive_scan)
2386 CALL_RXH(ieee80211_rx_h_check)
Johannes Berg2569a822009-11-25 17:46:17 +01002387
2388 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2389
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002390 ieee80211_rx_handlers(rx, &reorder_release);
2391 return;
Johannes Berg49461622008-06-30 15:10:45 +02002392
Johannes Berg2569a822009-11-25 17:46:17 +01002393 rxh_next:
Christian Lamparteraa0c8632010-08-05 01:36:04 +02002394 ieee80211_rx_handlers_result(rx, res);
2395
2396#undef CALL_RXH
Johannes Berg58905292008-01-31 19:48:25 +01002397}
2398
Johannes Berg571ecf62007-07-27 15:43:22 +02002399/* main receive path */
2400
Johannes Berg23a24de2007-07-27 15:43:22 +02002401static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
Johannes Berg7ab17c42009-02-10 21:25:43 +01002402 struct ieee80211_rx_data *rx,
Johannes Berg23a24de2007-07-27 15:43:22 +02002403 struct ieee80211_hdr *hdr)
2404{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002405 struct sk_buff *skb = rx->skb;
2406 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2407 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02002408 int multicast = is_multicast_ether_addr(hdr->addr1);
2409
Johannes Berg51fb61e2007-12-19 01:31:27 +01002410 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02002411 case NL80211_IFTYPE_STATION:
Johannes Berg9bc383d2009-11-19 11:55:19 +01002412 if (!bssid && !sdata->u.mgd.use_4addr)
Johannes Berg23a24de2007-07-27 15:43:22 +02002413 return 0;
Johannes Berg77fdaa12009-07-07 03:45:17 +02002414 if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002415 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002416 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002417 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002418 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002419 }
2420 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002421 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02002422 if (!bssid)
2423 return 0;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002424 if (ieee80211_is_beacon(hdr->frame_control)) {
Bruno Randolf9d9bf772008-02-18 11:21:36 +09002425 return 1;
Vladimir Koutny87291c02008-06-13 16:50:44 +02002426 }
Johannes Berg46900292009-02-15 12:44:28 +01002427 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01002428 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002429 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002430 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002431 } else if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002432 compare_ether_addr(sdata->vif.addr,
Johannes Berg23a24de2007-07-27 15:43:22 +02002433 hdr->addr1) != 0) {
Johannes Berg4150c572007-09-17 01:29:23 -04002434 if (!(sdata->dev->flags & IFF_PROMISC))
Johannes Berg23a24de2007-07-27 15:43:22 +02002435 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002436 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002437 } else if (!rx->sta) {
2438 int rate_idx;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002439 if (status->flag & RX_FLAG_HT)
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002440 rate_idx = 0; /* TODO: HT rates */
2441 else
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002442 rate_idx = status->rate_idx;
Johannes Berg34e89502010-02-03 13:59:58 +01002443 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2444 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002445 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002446 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002447 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg6032f932008-02-23 15:17:07 +01002448 if (!multicast &&
Johannes Berg47846c92009-11-25 17:46:19 +01002449 compare_ether_addr(sdata->vif.addr,
Johannes Berg6032f932008-02-23 15:17:07 +01002450 hdr->addr1) != 0) {
2451 if (!(sdata->dev->flags & IFF_PROMISC))
2452 return 0;
2453
Johannes Berg5cf121c2008-02-25 16:27:43 +01002454 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg6032f932008-02-23 15:17:07 +01002455 }
2456 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002457 case NL80211_IFTYPE_AP_VLAN:
2458 case NL80211_IFTYPE_AP:
Johannes Berg23a24de2007-07-27 15:43:22 +02002459 if (!bssid) {
Johannes Berg47846c92009-11-25 17:46:19 +01002460 if (compare_ether_addr(sdata->vif.addr,
Johannes Berg23a24de2007-07-27 15:43:22 +02002461 hdr->addr1))
2462 return 0;
2463 } else if (!ieee80211_bssid_match(bssid,
Johannes Berg47846c92009-11-25 17:46:19 +01002464 sdata->vif.addr)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01002465 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
Johannes Berg23a24de2007-07-27 15:43:22 +02002466 return 0;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002467 rx->flags &= ~IEEE80211_RX_RA_MATCH;
Johannes Berg23a24de2007-07-27 15:43:22 +02002468 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002469 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002470 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07002471 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg23a24de2007-07-27 15:43:22 +02002472 return 0;
2473 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2474 return 0;
2475 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002476 case NL80211_IFTYPE_MONITOR:
Johannes Berg05c914f2008-09-11 00:01:58 +02002477 case NL80211_IFTYPE_UNSPECIFIED:
2478 case __NL80211_IFTYPE_AFTER_LAST:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02002479 /* should never get here */
2480 WARN_ON(1);
2481 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02002482 }
2483
2484 return 1;
2485}
2486
Johannes Berg571ecf62007-07-27 15:43:22 +02002487/*
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002488 * This is the actual Rx frames handler. as it blongs to Rx path it must
2489 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02002490 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02002491static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2492 struct sk_buff *skb,
Johannes Berg8318d782008-01-24 19:38:38 +01002493 struct ieee80211_rate *rate)
Johannes Berg571ecf62007-07-27 15:43:22 +02002494{
Johannes Bergf1d58c22009-06-17 13:13:00 +02002495 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002496 struct ieee80211_local *local = hw_to_local(hw);
2497 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002498 struct ieee80211_hdr *hdr;
Zhu Yie3cf8b32010-03-29 17:35:07 +08002499 __le16 fc;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002500 struct ieee80211_rx_data rx;
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002501 int prepares;
Johannes Berg8e6f0032007-07-27 15:43:22 +02002502 struct ieee80211_sub_if_data *prev = NULL;
2503 struct sk_buff *skb_new;
Johannes Bergabe60632009-11-25 17:46:18 +01002504 struct sta_info *sta, *tmp;
2505 bool found_sta = false;
Zhu Yie3cf8b32010-03-29 17:35:07 +08002506 int err = 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02002507
Zhu Yie3cf8b32010-03-29 17:35:07 +08002508 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02002509 memset(&rx, 0, sizeof(rx));
2510 rx.skb = skb;
2511 rx.local = local;
Johannes Berg72abd812007-09-17 01:29:22 -04002512
Zhu Yie3cf8b32010-03-29 17:35:07 +08002513 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
Johannes Berg571ecf62007-07-27 15:43:22 +02002514 local->dot11ReceivedFragmentCount++;
Johannes Berg571ecf62007-07-27 15:43:22 +02002515
Helmut Schaa142b9f52009-07-23 13:18:01 +02002516 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2517 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
Johannes Berg5cf121c2008-02-25 16:27:43 +01002518 rx.flags |= IEEE80211_RX_IN_SCAN;
Johannes Berg571ecf62007-07-27 15:43:22 +02002519
Zhu Yie3cf8b32010-03-29 17:35:07 +08002520 if (ieee80211_is_mgmt(fc))
2521 err = skb_linearize(skb);
2522 else
2523 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2524
2525 if (err) {
2526 dev_kfree_skb(skb);
2527 return;
2528 }
2529
2530 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg38f37142008-01-29 17:07:43 +01002531 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01002532 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01002533
Zhu Yie3cf8b32010-03-29 17:35:07 +08002534 if (ieee80211_is_data(fc)) {
Johannes Bergabe60632009-11-25 17:46:18 +01002535 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2536 rx.sta = sta;
2537 found_sta = true;
2538 rx.sdata = sta->sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02002539
Johannes Bergabe60632009-11-25 17:46:18 +01002540 rx.flags |= IEEE80211_RX_RA_MATCH;
2541 prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
2542 if (prepares) {
2543 if (status->flag & RX_FLAG_MMIC_ERROR) {
2544 if (rx.flags & IEEE80211_RX_RA_MATCH)
2545 ieee80211_rx_michael_mic_report(hdr, &rx);
2546 } else
2547 prev = rx.sdata;
2548 }
2549 }
2550 }
2551 if (!found_sta) {
2552 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01002553 if (!ieee80211_sdata_running(sdata))
Johannes Bergabe60632009-11-25 17:46:18 +01002554 continue;
2555
2556 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2557 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2558 continue;
2559
Johannes Bergabe60632009-11-25 17:46:18 +01002560 /*
2561 * frame is destined for this interface, but if it's
2562 * not also for the previous one we handle that after
2563 * the loop to avoid copying the SKB once too much
2564 */
Johannes Bergb2e77712007-09-26 15:19:39 +02002565
Johannes Bergabe60632009-11-25 17:46:18 +01002566 if (!prev) {
2567 prev = sdata;
2568 continue;
2569 }
Johannes Berg23a24de2007-07-27 15:43:22 +02002570
Felix Fietkau4754ffd2010-01-31 21:50:12 +01002571 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002572
2573 rx.flags |= IEEE80211_RX_RA_MATCH;
2574 prepares = prepare_for_handlers(prev, &rx, hdr);
2575
2576 if (!prepares)
2577 goto next;
2578
2579 if (status->flag & RX_FLAG_MMIC_ERROR) {
2580 rx.sdata = prev;
2581 if (rx.flags & IEEE80211_RX_RA_MATCH)
2582 ieee80211_rx_michael_mic_report(hdr,
2583 &rx);
2584 goto next;
2585 }
2586
Johannes Bergabe60632009-11-25 17:46:18 +01002587 /*
2588 * frame was destined for the previous interface
2589 * so invoke RX handlers for it
2590 */
Johannes Berg8e6f0032007-07-27 15:43:22 +02002591
Johannes Bergabe60632009-11-25 17:46:18 +01002592 skb_new = skb_copy(skb, GFP_ATOMIC);
2593 if (!skb_new) {
2594 if (net_ratelimit())
2595 printk(KERN_DEBUG "%s: failed to copy "
2596 "multicast frame for %s\n",
2597 wiphy_name(local->hw.wiphy),
Johannes Berg47846c92009-11-25 17:46:19 +01002598 prev->name);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002599 goto next;
Johannes Bergabe60632009-11-25 17:46:18 +01002600 }
2601 ieee80211_invoke_rx_handlers(prev, &rx, skb_new, rate);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002602next:
Johannes Berg340e11f2007-07-27 15:43:22 +02002603 prev = sdata;
Johannes Berg8e6f0032007-07-27 15:43:22 +02002604 }
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002605
2606 if (prev) {
Felix Fietkau4754ffd2010-01-31 21:50:12 +01002607 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01002608
2609 rx.flags |= IEEE80211_RX_RA_MATCH;
2610 prepares = prepare_for_handlers(prev, &rx, hdr);
2611
2612 if (!prepares)
2613 prev = NULL;
2614 }
Johannes Berg571ecf62007-07-27 15:43:22 +02002615 }
Harvey Harrisona4b7d7b2008-07-15 18:44:14 -07002616 if (prev)
Johannes Berg5f0b7de2009-11-16 13:58:21 +01002617 ieee80211_invoke_rx_handlers(prev, &rx, skb, rate);
Harvey Harrisona4b7d7b2008-07-15 18:44:14 -07002618 else
Johannes Berg8e6f0032007-07-27 15:43:22 +02002619 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002620}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002621
2622/*
2623 * This is the receive path handler. It is called by a low level driver when an
2624 * 802.11 MPDU is received from the hardware.
2625 */
John W. Linville103bf9f2009-08-20 16:34:15 -04002626void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002627{
2628 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01002629 struct ieee80211_rate *rate = NULL;
2630 struct ieee80211_supported_band *sband;
Johannes Bergf1d58c22009-06-17 13:13:00 +02002631 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg8318d782008-01-24 19:38:38 +01002632
Johannes Bergd20ef632009-10-11 15:10:40 +02002633 WARN_ON_ONCE(softirq_count() == 0);
2634
Johannes Berg77a980d2009-08-24 11:46:30 +02002635 if (WARN_ON(status->band < 0 ||
2636 status->band >= IEEE80211_NUM_BANDS))
2637 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01002638
2639 sband = local->hw.wiphy->bands[status->band];
Johannes Berg77a980d2009-08-24 11:46:30 +02002640 if (WARN_ON(!sband))
2641 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01002642
Johannes Berg89c3a8a2009-07-28 18:10:17 +02002643 /*
2644 * If we're suspending, it is possible although not too likely
2645 * that we'd be receiving frames after having already partially
2646 * quiesced the stack. We can't process such frames then since
2647 * that might, for example, cause stations to be added or other
2648 * driver callbacks be invoked.
2649 */
Johannes Berg77a980d2009-08-24 11:46:30 +02002650 if (unlikely(local->quiescing || local->suspended))
2651 goto drop;
Johannes Berg89c3a8a2009-07-28 18:10:17 +02002652
Johannes Bergea77f122009-08-21 14:44:45 +02002653 /*
2654 * The same happens when we're not even started,
2655 * but that's worth a warning.
2656 */
Johannes Berg77a980d2009-08-24 11:46:30 +02002657 if (WARN_ON(!local->started))
2658 goto drop;
Johannes Bergea77f122009-08-21 14:44:45 +02002659
Johannes Bergfc885182010-07-30 13:23:12 +02002660 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05002661 /*
Johannes Bergfc885182010-07-30 13:23:12 +02002662 * Validate the rate, unless a PLCP error means that
2663 * we probably can't have a valid rate here anyway.
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05002664 */
Johannes Bergfc885182010-07-30 13:23:12 +02002665
2666 if (status->flag & RX_FLAG_HT) {
2667 /*
2668 * rate_idx is MCS index, which can be [0-76]
2669 * as documented on:
2670 *
2671 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2672 *
2673 * Anything else would be some sort of driver or
2674 * hardware error. The driver should catch hardware
2675 * errors.
2676 */
2677 if (WARN((status->rate_idx < 0 ||
2678 status->rate_idx > 76),
2679 "Rate marked as an HT rate but passed "
2680 "status->rate_idx is not "
2681 "an MCS index [0-76]: %d (0x%02x)\n",
2682 status->rate_idx,
2683 status->rate_idx))
2684 goto drop;
2685 } else {
2686 if (WARN_ON(status->rate_idx < 0 ||
2687 status->rate_idx >= sband->n_bitrates))
2688 goto drop;
2689 rate = &sband->bitrates[status->rate_idx];
2690 }
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02002691 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002692
2693 /*
2694 * key references and virtual interfaces are protected using RCU
2695 * and this requires that we are in a read-side RCU section during
2696 * receive processing
2697 */
2698 rcu_read_lock();
2699
2700 /*
2701 * Frames with failed FCS/PLCP checksum are not returned,
2702 * all other frames are returned without radiotap header
2703 * if it was previously present.
2704 * Also, frames with less than 16 bytes are dropped.
2705 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002706 skb = ieee80211_rx_monitor(local, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002707 if (!skb) {
2708 rcu_read_unlock();
2709 return;
2710 }
2711
Johannes Berg2569a822009-11-25 17:46:17 +01002712 __ieee80211_rx_handle_packet(hw, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002713
2714 rcu_read_unlock();
Johannes Berg77a980d2009-08-24 11:46:30 +02002715
2716 return;
2717 drop:
2718 kfree_skb(skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02002719}
John W. Linville103bf9f2009-08-20 16:34:15 -04002720EXPORT_SYMBOL(ieee80211_rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02002721
2722/* This is a version of the rx handler that can be called from hard irq
2723 * context. Post the skb on the queue and schedule the tasklet */
Johannes Bergf1d58c22009-06-17 13:13:00 +02002724void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02002725{
2726 struct ieee80211_local *local = hw_to_local(hw);
2727
2728 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2729
Johannes Berg571ecf62007-07-27 15:43:22 +02002730 skb->pkt_type = IEEE80211_RX_MSG;
2731 skb_queue_tail(&local->skb_queue, skb);
2732 tasklet_schedule(&local->tasklet);
2733}
2734EXPORT_SYMBOL(ieee80211_rx_irqsafe);