Commit | Line | Data |
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571ecf67 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
5 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/skbuff.h> | |
14 | #include <linux/netdevice.h> | |
15 | #include <linux/etherdevice.h> | |
d4e46a3d | 16 | #include <linux/rcupdate.h> |
571ecf67 JB |
17 | #include <net/mac80211.h> |
18 | #include <net/ieee80211_radiotap.h> | |
19 | ||
20 | #include "ieee80211_i.h" | |
21 | #include "ieee80211_led.h" | |
22 | #include "ieee80211_common.h" | |
23 | #include "wep.h" | |
24 | #include "wpa.h" | |
25 | #include "tkip.h" | |
26 | #include "wme.h" | |
27 | ||
b2e7771e JB |
28 | /* |
29 | * monitor mode reception | |
30 | * | |
31 | * This function cleans up the SKB, i.e. it removes all the stuff | |
32 | * only useful for monitoring. | |
33 | */ | |
34 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
35 | struct sk_buff *skb, | |
36 | int rtap_len) | |
37 | { | |
38 | skb_pull(skb, rtap_len); | |
39 | ||
40 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { | |
41 | if (likely(skb->len > FCS_LEN)) | |
42 | skb_trim(skb, skb->len - FCS_LEN); | |
43 | else { | |
44 | /* driver bug */ | |
45 | WARN_ON(1); | |
46 | dev_kfree_skb(skb); | |
47 | skb = NULL; | |
48 | } | |
49 | } | |
50 | ||
51 | return skb; | |
52 | } | |
53 | ||
54 | static inline int should_drop_frame(struct ieee80211_rx_status *status, | |
55 | struct sk_buff *skb, | |
56 | int present_fcs_len, | |
57 | int radiotap_len) | |
58 | { | |
59 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
60 | ||
61 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
62 | return 1; | |
63 | if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len)) | |
64 | return 1; | |
65 | if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FTYPE)) == | |
66 | cpu_to_le16(IEEE80211_FTYPE_CTL)) | |
67 | return 1; | |
68 | return 0; | |
69 | } | |
70 | ||
71 | /* | |
72 | * This function copies a received frame to all monitor interfaces and | |
73 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
74 | * radiotap header the driver might have added. | |
75 | */ | |
76 | static struct sk_buff * | |
77 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
78 | struct ieee80211_rx_status *status) | |
79 | { | |
80 | struct ieee80211_sub_if_data *sdata; | |
81 | struct ieee80211_rate *rate; | |
82 | int needed_headroom = 0; | |
83 | struct ieee80211_rtap_hdr { | |
84 | struct ieee80211_radiotap_header hdr; | |
85 | u8 flags; | |
86 | u8 rate; | |
87 | __le16 chan_freq; | |
88 | __le16 chan_flags; | |
89 | u8 antsignal; | |
90 | u8 padding_for_rxflags; | |
91 | __le16 rx_flags; | |
92 | } __attribute__ ((packed)) *rthdr; | |
93 | struct sk_buff *skb, *skb2; | |
94 | struct net_device *prev_dev = NULL; | |
95 | int present_fcs_len = 0; | |
96 | int rtap_len = 0; | |
97 | ||
98 | /* | |
99 | * First, we may need to make a copy of the skb because | |
100 | * (1) we need to modify it for radiotap (if not present), and | |
101 | * (2) the other RX handlers will modify the skb we got. | |
102 | * | |
103 | * We don't need to, of course, if we aren't going to return | |
104 | * the SKB because it has a bad FCS/PLCP checksum. | |
105 | */ | |
106 | if (status->flag & RX_FLAG_RADIOTAP) | |
107 | rtap_len = ieee80211_get_radiotap_len(origskb->data); | |
108 | else | |
109 | needed_headroom = sizeof(*rthdr); | |
110 | ||
111 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
112 | present_fcs_len = FCS_LEN; | |
113 | ||
114 | if (!local->monitors) { | |
115 | if (should_drop_frame(status, origskb, present_fcs_len, | |
116 | rtap_len)) { | |
117 | dev_kfree_skb(origskb); | |
118 | return NULL; | |
119 | } | |
120 | ||
121 | return remove_monitor_info(local, origskb, rtap_len); | |
122 | } | |
123 | ||
124 | if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) { | |
125 | /* only need to expand headroom if necessary */ | |
126 | skb = origskb; | |
127 | origskb = NULL; | |
128 | ||
129 | /* | |
130 | * This shouldn't trigger often because most devices have an | |
131 | * RX header they pull before we get here, and that should | |
132 | * be big enough for our radiotap information. We should | |
133 | * probably export the length to drivers so that we can have | |
134 | * them allocate enough headroom to start with. | |
135 | */ | |
136 | if (skb_headroom(skb) < needed_headroom && | |
137 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) { | |
138 | dev_kfree_skb(skb); | |
139 | return NULL; | |
140 | } | |
141 | } else { | |
142 | /* | |
143 | * Need to make a copy and possibly remove radiotap header | |
144 | * and FCS from the original. | |
145 | */ | |
146 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
147 | ||
148 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
149 | ||
150 | if (!skb) | |
151 | return origskb; | |
152 | } | |
153 | ||
154 | /* if necessary, prepend radiotap information */ | |
155 | if (!(status->flag & RX_FLAG_RADIOTAP)) { | |
156 | rthdr = (void *) skb_push(skb, sizeof(*rthdr)); | |
157 | memset(rthdr, 0, sizeof(*rthdr)); | |
158 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
159 | rthdr->hdr.it_present = | |
160 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
161 | (1 << IEEE80211_RADIOTAP_RATE) | | |
162 | (1 << IEEE80211_RADIOTAP_CHANNEL) | | |
163 | (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL) | | |
164 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
165 | rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ? | |
166 | IEEE80211_RADIOTAP_F_FCS : 0; | |
167 | ||
168 | /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */ | |
169 | rthdr->rx_flags = 0; | |
170 | if (status->flag & | |
171 | (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
172 | rthdr->rx_flags |= | |
173 | cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS); | |
174 | ||
175 | rate = ieee80211_get_rate(local, status->phymode, | |
176 | status->rate); | |
177 | if (rate) | |
178 | rthdr->rate = rate->rate / 5; | |
179 | ||
180 | rthdr->chan_freq = cpu_to_le16(status->freq); | |
181 | ||
182 | if (status->phymode == MODE_IEEE80211A) | |
183 | rthdr->chan_flags = | |
184 | cpu_to_le16(IEEE80211_CHAN_OFDM | | |
185 | IEEE80211_CHAN_5GHZ); | |
186 | else | |
187 | rthdr->chan_flags = | |
188 | cpu_to_le16(IEEE80211_CHAN_DYN | | |
189 | IEEE80211_CHAN_2GHZ); | |
190 | ||
191 | rthdr->antsignal = status->ssi; | |
192 | } | |
193 | ||
194 | skb_set_mac_header(skb, 0); | |
195 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
196 | skb->pkt_type = PACKET_OTHERHOST; | |
197 | skb->protocol = htons(ETH_P_802_2); | |
198 | ||
199 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
200 | if (!netif_running(sdata->dev)) | |
201 | continue; | |
202 | ||
203 | if (sdata->type != IEEE80211_IF_TYPE_MNTR) | |
204 | continue; | |
205 | ||
206 | if (prev_dev) { | |
207 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
208 | if (skb2) { | |
209 | skb2->dev = prev_dev; | |
210 | netif_rx(skb2); | |
211 | } | |
212 | } | |
213 | ||
214 | prev_dev = sdata->dev; | |
215 | sdata->dev->stats.rx_packets++; | |
216 | sdata->dev->stats.rx_bytes += skb->len; | |
217 | } | |
218 | ||
219 | if (prev_dev) { | |
220 | skb->dev = prev_dev; | |
221 | netif_rx(skb); | |
222 | } else | |
223 | dev_kfree_skb(skb); | |
224 | ||
225 | return origskb; | |
226 | } | |
227 | ||
228 | ||
571ecf67 JB |
229 | /* pre-rx handlers |
230 | * | |
231 | * these don't have dev/sdata fields in the rx data | |
52865dfd JB |
232 | * The sta value should also not be used because it may |
233 | * be NULL even though a STA (in IBSS mode) will be added. | |
571ecf67 JB |
234 | */ |
235 | ||
6e0d114d JB |
236 | static ieee80211_txrx_result |
237 | ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx) | |
238 | { | |
239 | u8 *data = rx->skb->data; | |
240 | int tid; | |
241 | ||
242 | /* does the frame have a qos control field? */ | |
243 | if (WLAN_FC_IS_QOS_DATA(rx->fc)) { | |
244 | u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN; | |
245 | /* frame has qos control */ | |
246 | tid = qc[0] & QOS_CONTROL_TID_MASK; | |
247 | } else { | |
248 | if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) { | |
249 | /* Separate TID for management frames */ | |
250 | tid = NUM_RX_DATA_QUEUES - 1; | |
251 | } else { | |
252 | /* no qos control present */ | |
253 | tid = 0; /* 802.1d - Best Effort */ | |
254 | } | |
255 | } | |
52865dfd | 256 | |
6e0d114d | 257 | I802_DEBUG_INC(rx->local->wme_rx_queue[tid]); |
52865dfd JB |
258 | /* only a debug counter, sta might not be assigned properly yet */ |
259 | if (rx->sta) | |
6e0d114d | 260 | I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]); |
6e0d114d JB |
261 | |
262 | rx->u.rx.queue = tid; | |
263 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. | |
264 | * For now, set skb->priority to 0 for other cases. */ | |
265 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
266 | ||
267 | return TXRX_CONTINUE; | |
268 | } | |
269 | ||
571ecf67 JB |
270 | static ieee80211_txrx_result |
271 | ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx) | |
272 | { | |
273 | struct ieee80211_local *local = rx->local; | |
274 | struct sk_buff *skb = rx->skb; | |
275 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
276 | u32 load = 0, hdrtime; | |
277 | struct ieee80211_rate *rate; | |
278 | struct ieee80211_hw_mode *mode = local->hw.conf.mode; | |
279 | int i; | |
280 | ||
281 | /* Estimate total channel use caused by this frame */ | |
282 | ||
283 | if (unlikely(mode->num_rates < 0)) | |
284 | return TXRX_CONTINUE; | |
285 | ||
286 | rate = &mode->rates[0]; | |
287 | for (i = 0; i < mode->num_rates; i++) { | |
288 | if (mode->rates[i].val == rx->u.rx.status->rate) { | |
289 | rate = &mode->rates[i]; | |
290 | break; | |
291 | } | |
292 | } | |
293 | ||
294 | /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values, | |
295 | * 1 usec = 1/8 * (1080 / 10) = 13.5 */ | |
296 | ||
297 | if (mode->mode == MODE_IEEE80211A || | |
571ecf67 JB |
298 | (mode->mode == MODE_IEEE80211G && |
299 | rate->flags & IEEE80211_RATE_ERP)) | |
300 | hdrtime = CHAN_UTIL_HDR_SHORT; | |
301 | else | |
302 | hdrtime = CHAN_UTIL_HDR_LONG; | |
303 | ||
304 | load = hdrtime; | |
305 | if (!is_multicast_ether_addr(hdr->addr1)) | |
306 | load += hdrtime; | |
307 | ||
308 | load += skb->len * rate->rate_inv; | |
309 | ||
310 | /* Divide channel_use by 8 to avoid wrapping around the counter */ | |
311 | load >>= CHAN_UTIL_SHIFT; | |
312 | local->channel_use_raw += load; | |
571ecf67 JB |
313 | rx->u.rx.load = load; |
314 | ||
315 | return TXRX_CONTINUE; | |
316 | } | |
317 | ||
318 | ieee80211_rx_handler ieee80211_rx_pre_handlers[] = | |
319 | { | |
320 | ieee80211_rx_h_parse_qos, | |
321 | ieee80211_rx_h_load_stats, | |
322 | NULL | |
323 | }; | |
324 | ||
325 | /* rx handlers */ | |
326 | ||
327 | static ieee80211_txrx_result | |
328 | ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx) | |
329 | { | |
52865dfd JB |
330 | if (rx->sta) |
331 | rx->sta->channel_use_raw += rx->u.rx.load; | |
571ecf67 JB |
332 | rx->sdata->channel_use_raw += rx->u.rx.load; |
333 | return TXRX_CONTINUE; | |
334 | } | |
335 | ||
571ecf67 JB |
336 | static ieee80211_txrx_result |
337 | ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx) | |
338 | { | |
339 | struct ieee80211_local *local = rx->local; | |
340 | struct sk_buff *skb = rx->skb; | |
341 | ||
342 | if (unlikely(local->sta_scanning != 0)) { | |
343 | ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status); | |
344 | return TXRX_QUEUED; | |
345 | } | |
346 | ||
badffb72 | 347 | if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) { |
571ecf67 JB |
348 | /* scanning finished during invoking of handlers */ |
349 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
350 | return TXRX_DROP; | |
351 | } | |
352 | ||
353 | return TXRX_CONTINUE; | |
354 | } | |
355 | ||
356 | static ieee80211_txrx_result | |
357 | ieee80211_rx_h_check(struct ieee80211_txrx_data *rx) | |
358 | { | |
359 | struct ieee80211_hdr *hdr; | |
571ecf67 JB |
360 | hdr = (struct ieee80211_hdr *) rx->skb->data; |
361 | ||
362 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
363 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
364 | if (unlikely(rx->fc & IEEE80211_FCTL_RETRY && | |
365 | rx->sta->last_seq_ctrl[rx->u.rx.queue] == | |
366 | hdr->seq_ctrl)) { | |
badffb72 | 367 | if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) { |
571ecf67 JB |
368 | rx->local->dot11FrameDuplicateCount++; |
369 | rx->sta->num_duplicates++; | |
370 | } | |
371 | return TXRX_DROP; | |
372 | } else | |
373 | rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl; | |
374 | } | |
375 | ||
571ecf67 JB |
376 | if (unlikely(rx->skb->len < 16)) { |
377 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
378 | return TXRX_DROP; | |
379 | } | |
380 | ||
badffb72 | 381 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
571ecf67 JB |
382 | rx->skb->pkt_type = PACKET_OTHERHOST; |
383 | else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0) | |
384 | rx->skb->pkt_type = PACKET_HOST; | |
385 | else if (is_multicast_ether_addr(hdr->addr1)) { | |
386 | if (is_broadcast_ether_addr(hdr->addr1)) | |
387 | rx->skb->pkt_type = PACKET_BROADCAST; | |
388 | else | |
389 | rx->skb->pkt_type = PACKET_MULTICAST; | |
390 | } else | |
391 | rx->skb->pkt_type = PACKET_OTHERHOST; | |
392 | ||
393 | /* Drop disallowed frame classes based on STA auth/assoc state; | |
394 | * IEEE 802.11, Chap 5.5. | |
395 | * | |
396 | * 80211.o does filtering only based on association state, i.e., it | |
397 | * drops Class 3 frames from not associated stations. hostapd sends | |
398 | * deauth/disassoc frames when needed. In addition, hostapd is | |
399 | * responsible for filtering on both auth and assoc states. | |
400 | */ | |
401 | if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA || | |
402 | ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL && | |
403 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) && | |
404 | rx->sdata->type != IEEE80211_IF_TYPE_IBSS && | |
405 | (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) { | |
406 | if ((!(rx->fc & IEEE80211_FCTL_FROMDS) && | |
407 | !(rx->fc & IEEE80211_FCTL_TODS) && | |
408 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) | |
badffb72 | 409 | || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) { |
571ecf67 JB |
410 | /* Drop IBSS frames and frames for other hosts |
411 | * silently. */ | |
412 | return TXRX_DROP; | |
413 | } | |
414 | ||
415 | if (!rx->local->apdev) | |
416 | return TXRX_DROP; | |
417 | ||
418 | ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status, | |
419 | ieee80211_msg_sta_not_assoc); | |
420 | return TXRX_QUEUED; | |
421 | } | |
422 | ||
570bd537 JB |
423 | return TXRX_CONTINUE; |
424 | } | |
425 | ||
426 | ||
427 | static ieee80211_txrx_result | |
428 | ieee80211_rx_h_load_key(struct ieee80211_txrx_data *rx) | |
429 | { | |
430 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
3017b80b JB |
431 | int keyidx; |
432 | int hdrlen; | |
d4e46a3d | 433 | struct ieee80211_key *stakey = NULL; |
570bd537 | 434 | |
3017b80b JB |
435 | /* |
436 | * Key selection 101 | |
437 | * | |
438 | * There are three types of keys: | |
439 | * - GTK (group keys) | |
440 | * - PTK (pairwise keys) | |
441 | * - STK (station-to-station pairwise keys) | |
442 | * | |
443 | * When selecting a key, we have to distinguish between multicast | |
444 | * (including broadcast) and unicast frames, the latter can only | |
445 | * use PTKs and STKs while the former always use GTKs. Unless, of | |
446 | * course, actual WEP keys ("pre-RSNA") are used, then unicast | |
447 | * frames can also use key indizes like GTKs. Hence, if we don't | |
448 | * have a PTK/STK we check the key index for a WEP key. | |
449 | * | |
8dc06a1c JB |
450 | * Note that in a regular BSS, multicast frames are sent by the |
451 | * AP only, associated stations unicast the frame to the AP first | |
452 | * which then multicasts it on their behalf. | |
453 | * | |
3017b80b JB |
454 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
455 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
456 | * The spec seems to expect that one negotiates the same key with |
457 | * every station but there's no such requirement; VLANs could be | |
458 | * possible. | |
3017b80b JB |
459 | */ |
460 | ||
461 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) | |
462 | return TXRX_CONTINUE; | |
571ecf67 | 463 | |
3017b80b JB |
464 | /* |
465 | * No point in finding a key if the frame is neither | |
466 | * addressed to us nor a multicast frame. | |
467 | */ | |
badffb72 | 468 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
3017b80b JB |
469 | return TXRX_CONTINUE; |
470 | ||
d4e46a3d JB |
471 | if (rx->sta) |
472 | stakey = rcu_dereference(rx->sta->key); | |
473 | ||
474 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { | |
475 | rx->key = stakey; | |
571ecf67 | 476 | } else { |
3017b80b JB |
477 | /* |
478 | * The device doesn't give us the IV so we won't be | |
479 | * able to look up the key. That's ok though, we | |
480 | * don't need to decrypt the frame, we just won't | |
481 | * be able to keep statistics accurate. | |
482 | * Except for key threshold notifications, should | |
483 | * we somehow allow the driver to tell us which key | |
484 | * the hardware used if this flag is set? | |
485 | */ | |
7848ba7d JB |
486 | if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) && |
487 | (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED)) | |
3017b80b JB |
488 | return TXRX_CONTINUE; |
489 | ||
490 | hdrlen = ieee80211_get_hdrlen(rx->fc); | |
491 | ||
492 | if (rx->skb->len < 8 + hdrlen) | |
493 | return TXRX_DROP; /* TODO: count this? */ | |
494 | ||
495 | /* | |
496 | * no need to call ieee80211_wep_get_keyidx, | |
497 | * it verifies a bunch of things we've done already | |
498 | */ | |
499 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
500 | ||
d4e46a3d | 501 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
502 | |
503 | /* | |
504 | * RSNA-protected unicast frames should always be sent with | |
505 | * pairwise or station-to-station keys, but for WEP we allow | |
506 | * using a key index as well. | |
507 | */ | |
8f20fc24 | 508 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
509 | !is_multicast_ether_addr(hdr->addr1)) |
510 | rx->key = NULL; | |
571ecf67 JB |
511 | } |
512 | ||
3017b80b | 513 | if (rx->key) { |
571ecf67 | 514 | rx->key->tx_rx_count++; |
011bfcc4 | 515 | /* TODO: add threshold stuff again */ |
571ecf67 JB |
516 | } |
517 | ||
518 | return TXRX_CONTINUE; | |
519 | } | |
520 | ||
521 | static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta) | |
522 | { | |
523 | struct ieee80211_sub_if_data *sdata; | |
0795af57 JP |
524 | DECLARE_MAC_BUF(mac); |
525 | ||
571ecf67 JB |
526 | sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); |
527 | ||
528 | if (sdata->bss) | |
529 | atomic_inc(&sdata->bss->num_sta_ps); | |
530 | sta->flags |= WLAN_STA_PS; | |
531 | sta->pspoll = 0; | |
532 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
533 | printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n", |
534 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 JB |
535 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
536 | } | |
537 | ||
538 | static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta) | |
539 | { | |
540 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
541 | struct sk_buff *skb; | |
542 | int sent = 0; | |
543 | struct ieee80211_sub_if_data *sdata; | |
544 | struct ieee80211_tx_packet_data *pkt_data; | |
0795af57 | 545 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
546 | |
547 | sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); | |
548 | if (sdata->bss) | |
549 | atomic_dec(&sdata->bss->num_sta_ps); | |
550 | sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM); | |
551 | sta->pspoll = 0; | |
552 | if (!skb_queue_empty(&sta->ps_tx_buf)) { | |
553 | if (local->ops->set_tim) | |
554 | local->ops->set_tim(local_to_hw(local), sta->aid, 0); | |
555 | if (sdata->bss) | |
556 | bss_tim_clear(local, sdata->bss, sta->aid); | |
557 | } | |
558 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
559 | printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n", |
560 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 JB |
561 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
562 | /* Send all buffered frames to the station */ | |
563 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
564 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; | |
565 | sent++; | |
e8bf9649 | 566 | pkt_data->flags |= IEEE80211_TXPD_REQUEUE; |
571ecf67 JB |
567 | dev_queue_xmit(skb); |
568 | } | |
569 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
570 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; | |
571 | local->total_ps_buffered--; | |
572 | sent++; | |
573 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 | 574 | printk(KERN_DEBUG "%s: STA %s aid %d send PS frame " |
571ecf67 | 575 | "since STA not sleeping anymore\n", dev->name, |
0795af57 | 576 | print_mac(mac, sta->addr), sta->aid); |
571ecf67 | 577 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
e8bf9649 | 578 | pkt_data->flags |= IEEE80211_TXPD_REQUEUE; |
571ecf67 JB |
579 | dev_queue_xmit(skb); |
580 | } | |
581 | ||
582 | return sent; | |
583 | } | |
584 | ||
585 | static ieee80211_txrx_result | |
586 | ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx) | |
587 | { | |
588 | struct sta_info *sta = rx->sta; | |
589 | struct net_device *dev = rx->dev; | |
590 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
591 | ||
592 | if (!sta) | |
593 | return TXRX_CONTINUE; | |
594 | ||
595 | /* Update last_rx only for IBSS packets which are for the current | |
596 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
597 | * other STAs are using different BSSID. */ | |
598 | if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) { | |
599 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len); | |
600 | if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0) | |
601 | sta->last_rx = jiffies; | |
602 | } else | |
603 | if (!is_multicast_ether_addr(hdr->addr1) || | |
604 | rx->sdata->type == IEEE80211_IF_TYPE_STA) { | |
605 | /* Update last_rx only for unicast frames in order to prevent | |
606 | * the Probe Request frames (the only broadcast frames from a | |
607 | * STA in infrastructure mode) from keeping a connection alive. | |
608 | */ | |
609 | sta->last_rx = jiffies; | |
610 | } | |
611 | ||
badffb72 | 612 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
571ecf67 JB |
613 | return TXRX_CONTINUE; |
614 | ||
615 | sta->rx_fragments++; | |
616 | sta->rx_bytes += rx->skb->len; | |
6c55aa97 LF |
617 | sta->last_rssi = rx->u.rx.status->ssi; |
618 | sta->last_signal = rx->u.rx.status->signal; | |
619 | sta->last_noise = rx->u.rx.status->noise; | |
571ecf67 JB |
620 | |
621 | if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) { | |
622 | /* Change STA power saving mode only in the end of a frame | |
623 | * exchange sequence */ | |
624 | if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM)) | |
625 | rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta); | |
626 | else if (!(sta->flags & WLAN_STA_PS) && | |
627 | (rx->fc & IEEE80211_FCTL_PM)) | |
628 | ap_sta_ps_start(dev, sta); | |
629 | } | |
630 | ||
631 | /* Drop data::nullfunc frames silently, since they are used only to | |
632 | * control station power saving mode. */ | |
633 | if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
634 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) { | |
635 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); | |
636 | /* Update counter and free packet here to avoid counting this | |
637 | * as a dropped packed. */ | |
638 | sta->rx_packets++; | |
639 | dev_kfree_skb(rx->skb); | |
640 | return TXRX_QUEUED; | |
641 | } | |
642 | ||
643 | return TXRX_CONTINUE; | |
644 | } /* ieee80211_rx_h_sta_process */ | |
645 | ||
646 | static ieee80211_txrx_result | |
647 | ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx) | |
648 | { | |
649 | if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) || | |
650 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA || | |
8f20fc24 | 651 | !rx->key || rx->key->conf.alg != ALG_WEP || |
badffb72 | 652 | !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
571ecf67 JB |
653 | return TXRX_CONTINUE; |
654 | ||
655 | /* Check for weak IVs, if hwaccel did not remove IV from the frame */ | |
7848ba7d JB |
656 | if (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) || |
657 | !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) | |
8f20fc24 | 658 | if (ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
571ecf67 | 659 | rx->sta->wep_weak_iv_count++; |
571ecf67 JB |
660 | |
661 | return TXRX_CONTINUE; | |
662 | } | |
663 | ||
664 | static ieee80211_txrx_result | |
4f0d18e2 | 665 | ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx) |
571ecf67 | 666 | { |
4f0d18e2 | 667 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) |
571ecf67 JB |
668 | return TXRX_CONTINUE; |
669 | ||
670 | if (!rx->key) { | |
1a84f3fd | 671 | if (net_ratelimit()) |
4f0d18e2 JB |
672 | printk(KERN_DEBUG "%s: RX protected frame," |
673 | " but have no key\n", rx->dev->name); | |
571ecf67 JB |
674 | return TXRX_DROP; |
675 | } | |
676 | ||
4f0d18e2 JB |
677 | switch (rx->key->conf.alg) { |
678 | case ALG_WEP: | |
679 | return ieee80211_crypto_wep_decrypt(rx); | |
680 | case ALG_TKIP: | |
681 | return ieee80211_crypto_tkip_decrypt(rx); | |
682 | case ALG_CCMP: | |
683 | return ieee80211_crypto_ccmp_decrypt(rx); | |
684 | case ALG_NONE: | |
685 | return TXRX_CONTINUE; | |
571ecf67 JB |
686 | } |
687 | ||
4f0d18e2 JB |
688 | /* not reached */ |
689 | WARN_ON(1); | |
690 | return TXRX_DROP; | |
571ecf67 JB |
691 | } |
692 | ||
693 | static inline struct ieee80211_fragment_entry * | |
694 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
695 | unsigned int frag, unsigned int seq, int rx_queue, | |
696 | struct sk_buff **skb) | |
697 | { | |
698 | struct ieee80211_fragment_entry *entry; | |
699 | int idx; | |
700 | ||
701 | idx = sdata->fragment_next; | |
702 | entry = &sdata->fragments[sdata->fragment_next++]; | |
703 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
704 | sdata->fragment_next = 0; | |
705 | ||
706 | if (!skb_queue_empty(&entry->skb_list)) { | |
707 | #ifdef CONFIG_MAC80211_DEBUG | |
708 | struct ieee80211_hdr *hdr = | |
709 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
0795af57 JP |
710 | DECLARE_MAC_BUF(mac); |
711 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
712 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " |
713 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0795af57 | 714 | "addr1=%s addr2=%s\n", |
571ecf67 JB |
715 | sdata->dev->name, idx, |
716 | jiffies - entry->first_frag_time, entry->seq, | |
0795af57 JP |
717 | entry->last_frag, print_mac(mac, hdr->addr1), |
718 | print_mac(mac2, hdr->addr2)); | |
571ecf67 JB |
719 | #endif /* CONFIG_MAC80211_DEBUG */ |
720 | __skb_queue_purge(&entry->skb_list); | |
721 | } | |
722 | ||
723 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
724 | *skb = NULL; | |
725 | entry->first_frag_time = jiffies; | |
726 | entry->seq = seq; | |
727 | entry->rx_queue = rx_queue; | |
728 | entry->last_frag = frag; | |
729 | entry->ccmp = 0; | |
730 | entry->extra_len = 0; | |
731 | ||
732 | return entry; | |
733 | } | |
734 | ||
735 | static inline struct ieee80211_fragment_entry * | |
736 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
737 | u16 fc, unsigned int frag, unsigned int seq, | |
738 | int rx_queue, struct ieee80211_hdr *hdr) | |
739 | { | |
740 | struct ieee80211_fragment_entry *entry; | |
741 | int i, idx; | |
742 | ||
743 | idx = sdata->fragment_next; | |
744 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
745 | struct ieee80211_hdr *f_hdr; | |
746 | u16 f_fc; | |
747 | ||
748 | idx--; | |
749 | if (idx < 0) | |
750 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
751 | ||
752 | entry = &sdata->fragments[idx]; | |
753 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
754 | entry->rx_queue != rx_queue || | |
755 | entry->last_frag + 1 != frag) | |
756 | continue; | |
757 | ||
758 | f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data; | |
759 | f_fc = le16_to_cpu(f_hdr->frame_control); | |
760 | ||
761 | if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) || | |
762 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || | |
763 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
764 | continue; | |
765 | ||
766 | if (entry->first_frag_time + 2 * HZ < jiffies) { | |
767 | __skb_queue_purge(&entry->skb_list); | |
768 | continue; | |
769 | } | |
770 | return entry; | |
771 | } | |
772 | ||
773 | return NULL; | |
774 | } | |
775 | ||
776 | static ieee80211_txrx_result | |
777 | ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx) | |
778 | { | |
779 | struct ieee80211_hdr *hdr; | |
780 | u16 sc; | |
781 | unsigned int frag, seq; | |
782 | struct ieee80211_fragment_entry *entry; | |
783 | struct sk_buff *skb; | |
0795af57 | 784 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
785 | |
786 | hdr = (struct ieee80211_hdr *) rx->skb->data; | |
787 | sc = le16_to_cpu(hdr->seq_ctrl); | |
788 | frag = sc & IEEE80211_SCTL_FRAG; | |
789 | ||
790 | if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) || | |
791 | (rx->skb)->len < 24 || | |
792 | is_multicast_ether_addr(hdr->addr1))) { | |
793 | /* not fragmented */ | |
794 | goto out; | |
795 | } | |
796 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
797 | ||
798 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
799 | ||
800 | if (frag == 0) { | |
801 | /* This is the first fragment of a new frame. */ | |
802 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
803 | rx->u.rx.queue, &(rx->skb)); | |
8f20fc24 | 804 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
571ecf67 JB |
805 | (rx->fc & IEEE80211_FCTL_PROTECTED)) { |
806 | /* Store CCMP PN so that we can verify that the next | |
807 | * fragment has a sequential PN value. */ | |
808 | entry->ccmp = 1; | |
809 | memcpy(entry->last_pn, | |
810 | rx->key->u.ccmp.rx_pn[rx->u.rx.queue], | |
811 | CCMP_PN_LEN); | |
812 | } | |
813 | return TXRX_QUEUED; | |
814 | } | |
815 | ||
816 | /* This is a fragment for a frame that should already be pending in | |
817 | * fragment cache. Add this fragment to the end of the pending entry. | |
818 | */ | |
819 | entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq, | |
820 | rx->u.rx.queue, hdr); | |
821 | if (!entry) { | |
822 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
823 | return TXRX_DROP; | |
824 | } | |
825 | ||
826 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
827 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
828 | if (entry->ccmp) { | |
829 | int i; | |
830 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 831 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
571ecf67 JB |
832 | return TXRX_DROP; |
833 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); | |
834 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
835 | pn[i]++; | |
836 | if (pn[i]) | |
837 | break; | |
838 | } | |
839 | rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue]; | |
840 | if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) { | |
1a84f3fd JB |
841 | if (net_ratelimit()) |
842 | printk(KERN_DEBUG "%s: defrag: CCMP PN not " | |
0795af57 | 843 | "sequential A2=%s" |
1a84f3fd JB |
844 | " PN=%02x%02x%02x%02x%02x%02x " |
845 | "(expected %02x%02x%02x%02x%02x%02x)\n", | |
0795af57 | 846 | rx->dev->name, print_mac(mac, hdr->addr2), |
1a84f3fd JB |
847 | rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], |
848 | rpn[5], pn[0], pn[1], pn[2], pn[3], | |
849 | pn[4], pn[5]); | |
571ecf67 JB |
850 | return TXRX_DROP; |
851 | } | |
852 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); | |
853 | } | |
854 | ||
855 | skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc)); | |
856 | __skb_queue_tail(&entry->skb_list, rx->skb); | |
857 | entry->last_frag = frag; | |
858 | entry->extra_len += rx->skb->len; | |
859 | if (rx->fc & IEEE80211_FCTL_MOREFRAGS) { | |
860 | rx->skb = NULL; | |
861 | return TXRX_QUEUED; | |
862 | } | |
863 | ||
864 | rx->skb = __skb_dequeue(&entry->skb_list); | |
865 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
866 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
867 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
868 | GFP_ATOMIC))) { | |
869 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
870 | __skb_queue_purge(&entry->skb_list); | |
871 | return TXRX_DROP; | |
872 | } | |
873 | } | |
874 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
875 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
876 | dev_kfree_skb(skb); | |
877 | } | |
878 | ||
879 | /* Complete frame has been reassembled - process it now */ | |
badffb72 | 880 | rx->flags |= IEEE80211_TXRXD_FRAGMENTED; |
571ecf67 JB |
881 | |
882 | out: | |
883 | if (rx->sta) | |
884 | rx->sta->rx_packets++; | |
885 | if (is_multicast_ether_addr(hdr->addr1)) | |
886 | rx->local->dot11MulticastReceivedFrameCount++; | |
887 | else | |
888 | ieee80211_led_rx(rx->local); | |
889 | return TXRX_CONTINUE; | |
890 | } | |
891 | ||
892 | static ieee80211_txrx_result | |
893 | ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx) | |
894 | { | |
895 | struct sk_buff *skb; | |
896 | int no_pending_pkts; | |
0795af57 | 897 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
898 | |
899 | if (likely(!rx->sta || | |
900 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL || | |
901 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL || | |
badffb72 | 902 | !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))) |
571ecf67 JB |
903 | return TXRX_CONTINUE; |
904 | ||
905 | skb = skb_dequeue(&rx->sta->tx_filtered); | |
906 | if (!skb) { | |
907 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
908 | if (skb) | |
909 | rx->local->total_ps_buffered--; | |
910 | } | |
911 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
912 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
913 | ||
914 | if (skb) { | |
915 | struct ieee80211_hdr *hdr = | |
916 | (struct ieee80211_hdr *) skb->data; | |
917 | ||
918 | /* tell TX path to send one frame even though the STA may | |
919 | * still remain is PS mode after this frame exchange */ | |
920 | rx->sta->pspoll = 1; | |
921 | ||
922 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
923 | printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n", |
924 | print_mac(mac, rx->sta->addr), rx->sta->aid, | |
571ecf67 JB |
925 | skb_queue_len(&rx->sta->ps_tx_buf)); |
926 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
927 | ||
928 | /* Use MoreData flag to indicate whether there are more | |
929 | * buffered frames for this STA */ | |
930 | if (no_pending_pkts) { | |
931 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); | |
932 | rx->sta->flags &= ~WLAN_STA_TIM; | |
933 | } else | |
934 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
935 | ||
936 | dev_queue_xmit(skb); | |
937 | ||
938 | if (no_pending_pkts) { | |
939 | if (rx->local->ops->set_tim) | |
940 | rx->local->ops->set_tim(local_to_hw(rx->local), | |
941 | rx->sta->aid, 0); | |
942 | if (rx->sdata->bss) | |
943 | bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid); | |
944 | } | |
945 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
946 | } else if (!rx->u.rx.sent_ps_buffered) { | |
0795af57 | 947 | printk(KERN_DEBUG "%s: STA %s sent PS Poll even " |
571ecf67 | 948 | "though there is no buffered frames for it\n", |
0795af57 | 949 | rx->dev->name, print_mac(mac, rx->sta->addr)); |
571ecf67 JB |
950 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
951 | ||
952 | } | |
953 | ||
954 | /* Free PS Poll skb here instead of returning TXRX_DROP that would | |
955 | * count as an dropped frame. */ | |
956 | dev_kfree_skb(rx->skb); | |
957 | ||
958 | return TXRX_QUEUED; | |
959 | } | |
960 | ||
6e0d114d JB |
961 | static ieee80211_txrx_result |
962 | ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx) | |
963 | { | |
964 | u16 fc = rx->fc; | |
965 | u8 *data = rx->skb->data; | |
966 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data; | |
967 | ||
968 | if (!WLAN_FC_IS_QOS_DATA(fc)) | |
969 | return TXRX_CONTINUE; | |
970 | ||
971 | /* remove the qos control field, update frame type and meta-data */ | |
972 | memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2); | |
973 | hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2); | |
974 | /* change frame type to non QOS */ | |
975 | rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA; | |
976 | hdr->frame_control = cpu_to_le16(fc); | |
977 | ||
978 | return TXRX_CONTINUE; | |
979 | } | |
980 | ||
571ecf67 JB |
981 | static ieee80211_txrx_result |
982 | ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx) | |
983 | { | |
984 | if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) && | |
badffb72 JS |
985 | rx->sdata->type != IEEE80211_IF_TYPE_STA && |
986 | (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) { | |
571ecf67 JB |
987 | /* Pass both encrypted and unencrypted EAPOL frames to user |
988 | * space for processing. */ | |
989 | if (!rx->local->apdev) | |
990 | return TXRX_DROP; | |
991 | ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status, | |
992 | ieee80211_msg_normal); | |
993 | return TXRX_QUEUED; | |
994 | } | |
995 | ||
996 | if (unlikely(rx->sdata->ieee802_1x && | |
997 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
998 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC && | |
999 | (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) && | |
1000 | !ieee80211_is_eapol(rx->skb))) { | |
1001 | #ifdef CONFIG_MAC80211_DEBUG | |
1002 | struct ieee80211_hdr *hdr = | |
1003 | (struct ieee80211_hdr *) rx->skb->data; | |
0795af57 JP |
1004 | DECLARE_MAC_BUF(mac); |
1005 | printk(KERN_DEBUG "%s: dropped frame from %s" | |
571ecf67 | 1006 | " (unauthorized port)\n", rx->dev->name, |
0795af57 | 1007 | print_mac(mac, hdr->addr2)); |
571ecf67 JB |
1008 | #endif /* CONFIG_MAC80211_DEBUG */ |
1009 | return TXRX_DROP; | |
1010 | } | |
1011 | ||
1012 | return TXRX_CONTINUE; | |
1013 | } | |
1014 | ||
1015 | static ieee80211_txrx_result | |
1016 | ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx) | |
1017 | { | |
3017b80b | 1018 | /* |
7848ba7d JB |
1019 | * Pass through unencrypted frames if the hardware has |
1020 | * decrypted them already. | |
3017b80b | 1021 | */ |
7848ba7d | 1022 | if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED) |
571ecf67 JB |
1023 | return TXRX_CONTINUE; |
1024 | ||
1025 | /* Drop unencrypted frames if key is set. */ | |
1026 | if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) && | |
1027 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
1028 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC && | |
1029 | (rx->key || rx->sdata->drop_unencrypted) && | |
1030 | (rx->sdata->eapol == 0 || | |
1031 | !ieee80211_is_eapol(rx->skb)))) { | |
1a84f3fd JB |
1032 | if (net_ratelimit()) |
1033 | printk(KERN_DEBUG "%s: RX non-WEP frame, but expected " | |
1034 | "encryption\n", rx->dev->name); | |
571ecf67 JB |
1035 | return TXRX_DROP; |
1036 | } | |
1037 | return TXRX_CONTINUE; | |
1038 | } | |
1039 | ||
1040 | static ieee80211_txrx_result | |
1041 | ieee80211_rx_h_data(struct ieee80211_txrx_data *rx) | |
1042 | { | |
1043 | struct net_device *dev = rx->dev; | |
1044 | struct ieee80211_local *local = rx->local; | |
1045 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
1046 | u16 fc, hdrlen, ethertype; | |
1047 | u8 *payload; | |
1048 | u8 dst[ETH_ALEN]; | |
1049 | u8 src[ETH_ALEN]; | |
1050 | struct sk_buff *skb = rx->skb, *skb2; | |
1051 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
0795af57 JP |
1052 | DECLARE_MAC_BUF(mac); |
1053 | DECLARE_MAC_BUF(mac2); | |
1054 | DECLARE_MAC_BUF(mac3); | |
1055 | DECLARE_MAC_BUF(mac4); | |
571ecf67 JB |
1056 | |
1057 | fc = rx->fc; | |
1058 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
1059 | return TXRX_CONTINUE; | |
1060 | ||
1061 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
1062 | return TXRX_DROP; | |
1063 | ||
1064 | hdrlen = ieee80211_get_hdrlen(fc); | |
1065 | ||
1066 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
1067 | * header | |
1068 | * IEEE 802.11 address fields: | |
1069 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
1070 | * 0 0 DA SA BSSID n/a | |
1071 | * 0 1 DA BSSID SA n/a | |
1072 | * 1 0 BSSID SA DA n/a | |
1073 | * 1 1 RA TA DA SA | |
1074 | */ | |
1075 | ||
1076 | switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
1077 | case IEEE80211_FCTL_TODS: | |
1078 | /* BSSID SA DA */ | |
1079 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1080 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1081 | ||
1082 | if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP && | |
1083 | sdata->type != IEEE80211_IF_TYPE_VLAN)) { | |
1a84f3fd JB |
1084 | if (net_ratelimit()) |
1085 | printk(KERN_DEBUG "%s: dropped ToDS frame " | |
0795af57 | 1086 | "(BSSID=%s SA=%s DA=%s)\n", |
1a84f3fd | 1087 | dev->name, |
0795af57 JP |
1088 | print_mac(mac, hdr->addr1), |
1089 | print_mac(mac2, hdr->addr2), | |
1090 | print_mac(mac3, hdr->addr3)); | |
571ecf67 JB |
1091 | return TXRX_DROP; |
1092 | } | |
1093 | break; | |
1094 | case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
1095 | /* RA TA DA SA */ | |
1096 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1097 | memcpy(src, hdr->addr4, ETH_ALEN); | |
1098 | ||
1099 | if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) { | |
1a84f3fd JB |
1100 | if (net_ratelimit()) |
1101 | printk(KERN_DEBUG "%s: dropped FromDS&ToDS " | |
0795af57 | 1102 | "frame (RA=%s TA=%s DA=%s SA=%s)\n", |
1a84f3fd | 1103 | rx->dev->name, |
0795af57 JP |
1104 | print_mac(mac, hdr->addr1), |
1105 | print_mac(mac2, hdr->addr2), | |
1106 | print_mac(mac3, hdr->addr3), | |
1107 | print_mac(mac4, hdr->addr4)); | |
571ecf67 JB |
1108 | return TXRX_DROP; |
1109 | } | |
1110 | break; | |
1111 | case IEEE80211_FCTL_FROMDS: | |
1112 | /* DA BSSID SA */ | |
1113 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1114 | memcpy(src, hdr->addr3, ETH_ALEN); | |
1115 | ||
b3316157 JL |
1116 | if (sdata->type != IEEE80211_IF_TYPE_STA || |
1117 | (is_multicast_ether_addr(dst) && | |
1118 | !compare_ether_addr(src, dev->dev_addr))) | |
571ecf67 | 1119 | return TXRX_DROP; |
571ecf67 JB |
1120 | break; |
1121 | case 0: | |
1122 | /* DA SA BSSID */ | |
1123 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1124 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1125 | ||
1126 | if (sdata->type != IEEE80211_IF_TYPE_IBSS) { | |
1127 | if (net_ratelimit()) { | |
0795af57 JP |
1128 | printk(KERN_DEBUG "%s: dropped IBSS frame " |
1129 | "(DA=%s SA=%s BSSID=%s)\n", | |
1130 | dev->name, | |
1131 | print_mac(mac, hdr->addr1), | |
1132 | print_mac(mac2, hdr->addr2), | |
1133 | print_mac(mac3, hdr->addr3)); | |
571ecf67 JB |
1134 | } |
1135 | return TXRX_DROP; | |
1136 | } | |
1137 | break; | |
1138 | } | |
1139 | ||
1140 | payload = skb->data + hdrlen; | |
1141 | ||
1142 | if (unlikely(skb->len - hdrlen < 8)) { | |
1143 | if (net_ratelimit()) { | |
1144 | printk(KERN_DEBUG "%s: RX too short data frame " | |
1145 | "payload\n", dev->name); | |
1146 | } | |
1147 | return TXRX_DROP; | |
1148 | } | |
1149 | ||
1150 | ethertype = (payload[6] << 8) | payload[7]; | |
1151 | ||
1152 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1153 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1154 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1155 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1156 | * replace EtherType */ | |
1157 | skb_pull(skb, hdrlen + 6); | |
1158 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1159 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1160 | } else { | |
1161 | struct ethhdr *ehdr; | |
1162 | __be16 len; | |
1163 | skb_pull(skb, hdrlen); | |
1164 | len = htons(skb->len); | |
1165 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1166 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1167 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1168 | ehdr->h_proto = len; | |
1169 | } | |
1170 | skb->dev = dev; | |
1171 | ||
1172 | skb2 = NULL; | |
1173 | ||
68aae116 SH |
1174 | dev->stats.rx_packets++; |
1175 | dev->stats.rx_bytes += skb->len; | |
571ecf67 JB |
1176 | |
1177 | if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP | |
badffb72 JS |
1178 | || sdata->type == IEEE80211_IF_TYPE_VLAN) && |
1179 | (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) { | |
571ecf67 JB |
1180 | if (is_multicast_ether_addr(skb->data)) { |
1181 | /* send multicast frames both to higher layers in | |
1182 | * local net stack and back to the wireless media */ | |
1183 | skb2 = skb_copy(skb, GFP_ATOMIC); | |
1a84f3fd | 1184 | if (!skb2 && net_ratelimit()) |
571ecf67 JB |
1185 | printk(KERN_DEBUG "%s: failed to clone " |
1186 | "multicast frame\n", dev->name); | |
1187 | } else { | |
1188 | struct sta_info *dsta; | |
1189 | dsta = sta_info_get(local, skb->data); | |
1190 | if (dsta && !dsta->dev) { | |
1a84f3fd JB |
1191 | if (net_ratelimit()) |
1192 | printk(KERN_DEBUG "Station with null " | |
1193 | "dev structure!\n"); | |
571ecf67 JB |
1194 | } else if (dsta && dsta->dev == dev) { |
1195 | /* Destination station is associated to this | |
1196 | * AP, so send the frame directly to it and | |
1197 | * do not pass the frame to local net stack. | |
1198 | */ | |
1199 | skb2 = skb; | |
1200 | skb = NULL; | |
1201 | } | |
1202 | if (dsta) | |
1203 | sta_info_put(dsta); | |
1204 | } | |
1205 | } | |
1206 | ||
1207 | if (skb) { | |
1208 | /* deliver to local stack */ | |
1209 | skb->protocol = eth_type_trans(skb, dev); | |
1210 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1211 | netif_rx(skb); | |
1212 | } | |
1213 | ||
1214 | if (skb2) { | |
1215 | /* send to wireless media */ | |
1216 | skb2->protocol = __constant_htons(ETH_P_802_3); | |
1217 | skb_set_network_header(skb2, 0); | |
1218 | skb_set_mac_header(skb2, 0); | |
1219 | dev_queue_xmit(skb2); | |
1220 | } | |
1221 | ||
1222 | return TXRX_QUEUED; | |
1223 | } | |
1224 | ||
1225 | static ieee80211_txrx_result | |
1226 | ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx) | |
1227 | { | |
1228 | struct ieee80211_sub_if_data *sdata; | |
1229 | ||
badffb72 | 1230 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
571ecf67 JB |
1231 | return TXRX_DROP; |
1232 | ||
1233 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1234 | if ((sdata->type == IEEE80211_IF_TYPE_STA || | |
1235 | sdata->type == IEEE80211_IF_TYPE_IBSS) && | |
1236 | !rx->local->user_space_mlme) { | |
1237 | ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status); | |
1238 | } else { | |
1239 | /* Management frames are sent to hostapd for processing */ | |
1240 | if (!rx->local->apdev) | |
1241 | return TXRX_DROP; | |
1242 | ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status, | |
1243 | ieee80211_msg_normal); | |
1244 | } | |
1245 | return TXRX_QUEUED; | |
1246 | } | |
1247 | ||
1248 | static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers( | |
1249 | struct ieee80211_local *local, | |
1250 | ieee80211_rx_handler *handlers, | |
1251 | struct ieee80211_txrx_data *rx, | |
1252 | struct sta_info *sta) | |
1253 | { | |
1254 | ieee80211_rx_handler *handler; | |
1255 | ieee80211_txrx_result res = TXRX_DROP; | |
1256 | ||
1257 | for (handler = handlers; *handler != NULL; handler++) { | |
1258 | res = (*handler)(rx); | |
8e6f0032 JB |
1259 | |
1260 | switch (res) { | |
1261 | case TXRX_CONTINUE: | |
1262 | continue; | |
1263 | case TXRX_DROP: | |
1264 | I802_DEBUG_INC(local->rx_handlers_drop); | |
1265 | if (sta) | |
1266 | sta->rx_dropped++; | |
1267 | break; | |
1268 | case TXRX_QUEUED: | |
1269 | I802_DEBUG_INC(local->rx_handlers_queued); | |
571ecf67 JB |
1270 | break; |
1271 | } | |
8e6f0032 | 1272 | break; |
571ecf67 JB |
1273 | } |
1274 | ||
8e6f0032 | 1275 | if (res == TXRX_DROP) |
571ecf67 | 1276 | dev_kfree_skb(rx->skb); |
571ecf67 JB |
1277 | return res; |
1278 | } | |
1279 | ||
1280 | static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local, | |
1281 | ieee80211_rx_handler *handlers, | |
1282 | struct ieee80211_txrx_data *rx, | |
1283 | struct sta_info *sta) | |
1284 | { | |
1285 | if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) == | |
1286 | TXRX_CONTINUE) | |
1287 | dev_kfree_skb(rx->skb); | |
1288 | } | |
1289 | ||
1290 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, | |
1291 | struct ieee80211_hdr *hdr, | |
1292 | struct sta_info *sta, | |
1293 | struct ieee80211_txrx_data *rx) | |
1294 | { | |
1295 | int keyidx, hdrlen; | |
0795af57 JP |
1296 | DECLARE_MAC_BUF(mac); |
1297 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
1298 | |
1299 | hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb); | |
1300 | if (rx->skb->len >= hdrlen + 4) | |
1301 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1302 | else | |
1303 | keyidx = -1; | |
1304 | ||
1a84f3fd JB |
1305 | if (net_ratelimit()) |
1306 | printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC " | |
0795af57 JP |
1307 | "failure from %s to %s keyidx=%d\n", |
1308 | dev->name, print_mac(mac, hdr->addr2), | |
1309 | print_mac(mac2, hdr->addr1), keyidx); | |
571ecf67 JB |
1310 | |
1311 | if (!sta) { | |
aa0daf0e JB |
1312 | /* |
1313 | * Some hardware seem to generate incorrect Michael MIC | |
1314 | * reports; ignore them to avoid triggering countermeasures. | |
1315 | */ | |
1a84f3fd JB |
1316 | if (net_ratelimit()) |
1317 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
0795af57 JP |
1318 | "error for unknown address %s\n", |
1319 | dev->name, print_mac(mac, hdr->addr2)); | |
571ecf67 JB |
1320 | goto ignore; |
1321 | } | |
1322 | ||
1323 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) { | |
1a84f3fd JB |
1324 | if (net_ratelimit()) |
1325 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
aa0daf0e | 1326 | "error for a frame with no PROTECTED flag (src " |
0795af57 | 1327 | "%s)\n", dev->name, print_mac(mac, hdr->addr2)); |
571ecf67 JB |
1328 | goto ignore; |
1329 | } | |
1330 | ||
7848ba7d | 1331 | if (rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) { |
aa0daf0e JB |
1332 | /* |
1333 | * APs with pairwise keys should never receive Michael MIC | |
1334 | * errors for non-zero keyidx because these are reserved for | |
1335 | * group keys and only the AP is sending real multicast | |
1336 | * frames in the BSS. | |
1337 | */ | |
eb063c17 JB |
1338 | if (net_ratelimit()) |
1339 | printk(KERN_DEBUG "%s: ignored Michael MIC error for " | |
1340 | "a frame with non-zero keyidx (%d)" | |
0795af57 JP |
1341 | " (src %s)\n", dev->name, keyidx, |
1342 | print_mac(mac, hdr->addr2)); | |
eb063c17 | 1343 | goto ignore; |
571ecf67 JB |
1344 | } |
1345 | ||
1346 | if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA && | |
1347 | ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || | |
1348 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) { | |
1a84f3fd JB |
1349 | if (net_ratelimit()) |
1350 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
1351 | "error for a frame that cannot be encrypted " | |
0795af57 JP |
1352 | "(fc=0x%04x) (src %s)\n", |
1353 | dev->name, rx->fc, print_mac(mac, hdr->addr2)); | |
571ecf67 JB |
1354 | goto ignore; |
1355 | } | |
1356 | ||
eb063c17 | 1357 | mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr); |
571ecf67 JB |
1358 | ignore: |
1359 | dev_kfree_skb(rx->skb); | |
1360 | rx->skb = NULL; | |
1361 | } | |
1362 | ||
1363 | ieee80211_rx_handler ieee80211_rx_handlers[] = | |
1364 | { | |
1365 | ieee80211_rx_h_if_stats, | |
571ecf67 JB |
1366 | ieee80211_rx_h_passive_scan, |
1367 | ieee80211_rx_h_check, | |
570bd537 | 1368 | ieee80211_rx_h_load_key, |
571ecf67 | 1369 | ieee80211_rx_h_sta_process, |
571ecf67 | 1370 | ieee80211_rx_h_wep_weak_iv_detection, |
4f0d18e2 | 1371 | ieee80211_rx_h_decrypt, |
571ecf67 JB |
1372 | ieee80211_rx_h_defragment, |
1373 | ieee80211_rx_h_ps_poll, | |
1374 | ieee80211_rx_h_michael_mic_verify, | |
1375 | /* this must be after decryption - so header is counted in MPDU mic | |
1376 | * must be before pae and data, so QOS_DATA format frames | |
1377 | * are not passed to user space by these functions | |
1378 | */ | |
1379 | ieee80211_rx_h_remove_qos_control, | |
1380 | ieee80211_rx_h_802_1x_pae, | |
1381 | ieee80211_rx_h_drop_unencrypted, | |
1382 | ieee80211_rx_h_data, | |
1383 | ieee80211_rx_h_mgmt, | |
1384 | NULL | |
1385 | }; | |
1386 | ||
1387 | /* main receive path */ | |
1388 | ||
23a24def JB |
1389 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
1390 | u8 *bssid, struct ieee80211_txrx_data *rx, | |
1391 | struct ieee80211_hdr *hdr) | |
1392 | { | |
1393 | int multicast = is_multicast_ether_addr(hdr->addr1); | |
1394 | ||
1395 | switch (sdata->type) { | |
1396 | case IEEE80211_IF_TYPE_STA: | |
1397 | if (!bssid) | |
1398 | return 0; | |
1399 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
badffb72 | 1400 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1401 | return 0; |
badffb72 | 1402 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1403 | } else if (!multicast && |
1404 | compare_ether_addr(sdata->dev->dev_addr, | |
1405 | hdr->addr1) != 0) { | |
4150c572 | 1406 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1407 | return 0; |
badffb72 | 1408 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1409 | } |
1410 | break; | |
1411 | case IEEE80211_IF_TYPE_IBSS: | |
1412 | if (!bssid) | |
1413 | return 0; | |
1414 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
badffb72 | 1415 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1416 | return 0; |
badffb72 | 1417 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1418 | } else if (!multicast && |
1419 | compare_ether_addr(sdata->dev->dev_addr, | |
1420 | hdr->addr1) != 0) { | |
4150c572 | 1421 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1422 | return 0; |
badffb72 | 1423 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1424 | } else if (!rx->sta) |
1425 | rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb, | |
1426 | bssid, hdr->addr2); | |
1427 | break; | |
fb1c1cd6 | 1428 | case IEEE80211_IF_TYPE_VLAN: |
23a24def JB |
1429 | case IEEE80211_IF_TYPE_AP: |
1430 | if (!bssid) { | |
1431 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1432 | hdr->addr1)) | |
1433 | return 0; | |
1434 | } else if (!ieee80211_bssid_match(bssid, | |
1435 | sdata->dev->dev_addr)) { | |
badffb72 | 1436 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1437 | return 0; |
badffb72 | 1438 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def | 1439 | } |
badffb72 JS |
1440 | if (sdata->dev == sdata->local->mdev && |
1441 | !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) | |
23a24def JB |
1442 | /* do not receive anything via |
1443 | * master device when not scanning */ | |
1444 | return 0; | |
1445 | break; | |
1446 | case IEEE80211_IF_TYPE_WDS: | |
1447 | if (bssid || | |
1448 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) | |
1449 | return 0; | |
1450 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
1451 | return 0; | |
1452 | break; | |
fb1c1cd6 JB |
1453 | case IEEE80211_IF_TYPE_MNTR: |
1454 | /* take everything */ | |
1455 | break; | |
a2897552 | 1456 | case IEEE80211_IF_TYPE_INVALID: |
fb1c1cd6 JB |
1457 | case IEEE80211_IF_TYPE_MGMT: |
1458 | /* should never get here */ | |
1459 | WARN_ON(1); | |
1460 | break; | |
23a24def JB |
1461 | } |
1462 | ||
1463 | return 1; | |
1464 | } | |
1465 | ||
571ecf67 JB |
1466 | /* |
1467 | * This is the receive path handler. It is called by a low level driver when an | |
1468 | * 802.11 MPDU is received from the hardware. | |
1469 | */ | |
1470 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
1471 | struct ieee80211_rx_status *status) | |
1472 | { | |
1473 | struct ieee80211_local *local = hw_to_local(hw); | |
1474 | struct ieee80211_sub_if_data *sdata; | |
1475 | struct sta_info *sta; | |
1476 | struct ieee80211_hdr *hdr; | |
1477 | struct ieee80211_txrx_data rx; | |
1478 | u16 type; | |
b2e7771e | 1479 | int prepres; |
8e6f0032 JB |
1480 | struct ieee80211_sub_if_data *prev = NULL; |
1481 | struct sk_buff *skb_new; | |
1482 | u8 *bssid; | |
571ecf67 | 1483 | |
d4e46a3d | 1484 | /* |
79010420 JB |
1485 | * key references and virtual interfaces are protected using RCU |
1486 | * and this requires that we are in a read-side RCU section during | |
1487 | * receive processing | |
d4e46a3d JB |
1488 | */ |
1489 | rcu_read_lock(); | |
1490 | ||
b2e7771e JB |
1491 | /* |
1492 | * Frames with failed FCS/PLCP checksum are not returned, | |
1493 | * all other frames are returned without radiotap header | |
1494 | * if it was previously present. | |
1495 | * Also, frames with less than 16 bytes are dropped. | |
1496 | */ | |
1497 | skb = ieee80211_rx_monitor(local, skb, status); | |
1498 | if (!skb) { | |
1499 | rcu_read_unlock(); | |
1500 | return; | |
1501 | } | |
1502 | ||
571ecf67 JB |
1503 | hdr = (struct ieee80211_hdr *) skb->data; |
1504 | memset(&rx, 0, sizeof(rx)); | |
1505 | rx.skb = skb; | |
1506 | rx.local = local; | |
1507 | ||
1508 | rx.u.rx.status = status; | |
b2e7771e | 1509 | rx.fc = le16_to_cpu(hdr->frame_control); |
571ecf67 | 1510 | type = rx.fc & IEEE80211_FCTL_FTYPE; |
72abd81b | 1511 | |
b2e7771e | 1512 | if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT) |
571ecf67 | 1513 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 1514 | |
b2e7771e JB |
1515 | sta = rx.sta = sta_info_get(local, hdr->addr2); |
1516 | if (sta) { | |
1517 | rx.dev = rx.sta->dev; | |
1518 | rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev); | |
1519 | } | |
571ecf67 | 1520 | |
571ecf67 JB |
1521 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
1522 | ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx); | |
1523 | goto end; | |
1524 | } | |
1525 | ||
1526 | if (unlikely(local->sta_scanning)) | |
badffb72 | 1527 | rx.flags |= IEEE80211_TXRXD_RXIN_SCAN; |
571ecf67 JB |
1528 | |
1529 | if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx, | |
1530 | sta) != TXRX_CONTINUE) | |
1531 | goto end; | |
1532 | skb = rx.skb; | |
1533 | ||
c9ee23df | 1534 | if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) && |
53918994 JB |
1535 | !atomic_read(&local->iff_promiscs) && |
1536 | !is_multicast_ether_addr(hdr->addr1)) { | |
badffb72 | 1537 | rx.flags |= IEEE80211_TXRXD_RXRA_MATCH; |
571ecf67 | 1538 | ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx, |
23a24def | 1539 | rx.sta); |
8e6f0032 | 1540 | sta_info_put(sta); |
d4e46a3d | 1541 | rcu_read_unlock(); |
8e6f0032 JB |
1542 | return; |
1543 | } | |
1544 | ||
b2e7771e | 1545 | bssid = ieee80211_get_bssid(hdr, skb->len); |
8e6f0032 | 1546 | |
79010420 | 1547 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
1548 | if (!netif_running(sdata->dev)) |
1549 | continue; | |
1550 | ||
b2e7771e JB |
1551 | if (sdata->type == IEEE80211_IF_TYPE_MNTR) |
1552 | continue; | |
1553 | ||
1554 | rx.flags |= IEEE80211_TXRXD_RXRA_MATCH; | |
23a24def JB |
1555 | prepres = prepare_for_handlers(sdata, bssid, &rx, hdr); |
1556 | /* prepare_for_handlers can change sta */ | |
1557 | sta = rx.sta; | |
1558 | ||
1559 | if (!prepres) | |
1560 | continue; | |
8e6f0032 | 1561 | |
340e11f3 JB |
1562 | /* |
1563 | * frame is destined for this interface, but if it's not | |
1564 | * also for the previous one we handle that after the | |
1565 | * loop to avoid copying the SKB once too much | |
1566 | */ | |
1567 | ||
1568 | if (!prev) { | |
1569 | prev = sdata; | |
1570 | continue; | |
8e6f0032 | 1571 | } |
340e11f3 JB |
1572 | |
1573 | /* | |
1574 | * frame was destined for the previous interface | |
1575 | * so invoke RX handlers for it | |
1576 | */ | |
1577 | ||
1578 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
1579 | if (!skb_new) { | |
1580 | if (net_ratelimit()) | |
1581 | printk(KERN_DEBUG "%s: failed to copy " | |
1582 | "multicast frame for %s", | |
dd1cd4c6 JB |
1583 | wiphy_name(local->hw.wiphy), |
1584 | prev->dev->name); | |
340e11f3 JB |
1585 | continue; |
1586 | } | |
1587 | rx.skb = skb_new; | |
1588 | rx.dev = prev->dev; | |
1589 | rx.sdata = prev; | |
1590 | ieee80211_invoke_rx_handlers(local, local->rx_handlers, | |
1591 | &rx, sta); | |
8e6f0032 | 1592 | prev = sdata; |
571ecf67 | 1593 | } |
8e6f0032 JB |
1594 | if (prev) { |
1595 | rx.skb = skb; | |
1596 | rx.dev = prev->dev; | |
1597 | rx.sdata = prev; | |
1598 | ieee80211_invoke_rx_handlers(local, local->rx_handlers, | |
1599 | &rx, sta); | |
1600 | } else | |
1601 | dev_kfree_skb(skb); | |
571ecf67 | 1602 | |
8e6f0032 | 1603 | end: |
d4e46a3d JB |
1604 | rcu_read_unlock(); |
1605 | ||
571ecf67 JB |
1606 | if (sta) |
1607 | sta_info_put(sta); | |
1608 | } | |
1609 | EXPORT_SYMBOL(__ieee80211_rx); | |
1610 | ||
1611 | /* This is a version of the rx handler that can be called from hard irq | |
1612 | * context. Post the skb on the queue and schedule the tasklet */ | |
1613 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
1614 | struct ieee80211_rx_status *status) | |
1615 | { | |
1616 | struct ieee80211_local *local = hw_to_local(hw); | |
1617 | ||
1618 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
1619 | ||
1620 | skb->dev = local->mdev; | |
1621 | /* copy status into skb->cb for use by tasklet */ | |
1622 | memcpy(skb->cb, status, sizeof(*status)); | |
1623 | skb->pkt_type = IEEE80211_RX_MSG; | |
1624 | skb_queue_tail(&local->skb_queue, skb); | |
1625 | tasklet_schedule(&local->tasklet); | |
1626 | } | |
1627 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |