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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" | |
571ecf67 JB |
22 | #include "wep.h" |
23 | #include "wpa.h" | |
24 | #include "tkip.h" | |
25 | #include "wme.h" | |
26 | ||
b2e7771e JB |
27 | /* |
28 | * monitor mode reception | |
29 | * | |
30 | * This function cleans up the SKB, i.e. it removes all the stuff | |
31 | * only useful for monitoring. | |
32 | */ | |
33 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
34 | struct sk_buff *skb, | |
35 | int rtap_len) | |
36 | { | |
37 | skb_pull(skb, rtap_len); | |
38 | ||
39 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { | |
40 | if (likely(skb->len > FCS_LEN)) | |
41 | skb_trim(skb, skb->len - FCS_LEN); | |
42 | else { | |
43 | /* driver bug */ | |
44 | WARN_ON(1); | |
45 | dev_kfree_skb(skb); | |
46 | skb = NULL; | |
47 | } | |
48 | } | |
49 | ||
50 | return skb; | |
51 | } | |
52 | ||
53 | static inline int should_drop_frame(struct ieee80211_rx_status *status, | |
54 | struct sk_buff *skb, | |
55 | int present_fcs_len, | |
56 | int radiotap_len) | |
57 | { | |
58 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
59 | ||
60 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
61 | return 1; | |
62 | if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len)) | |
63 | return 1; | |
98f0b0a3 RR |
64 | if (((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FTYPE)) == |
65 | cpu_to_le16(IEEE80211_FTYPE_CTL)) && | |
66 | ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE)) != | |
67 | cpu_to_le16(IEEE80211_STYPE_PSPOLL))) | |
b2e7771e JB |
68 | return 1; |
69 | return 0; | |
70 | } | |
71 | ||
72 | /* | |
73 | * This function copies a received frame to all monitor interfaces and | |
74 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
75 | * radiotap header the driver might have added. | |
76 | */ | |
77 | static struct sk_buff * | |
78 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
79 | struct ieee80211_rx_status *status) | |
80 | { | |
81 | struct ieee80211_sub_if_data *sdata; | |
82 | struct ieee80211_rate *rate; | |
83 | int needed_headroom = 0; | |
c49e5ea3 JB |
84 | struct ieee80211_radiotap_header *rthdr; |
85 | __le64 *rttsft = NULL; | |
86 | struct ieee80211_rtap_fixed_data { | |
b2e7771e JB |
87 | u8 flags; |
88 | u8 rate; | |
89 | __le16 chan_freq; | |
90 | __le16 chan_flags; | |
91 | u8 antsignal; | |
92 | u8 padding_for_rxflags; | |
93 | __le16 rx_flags; | |
c49e5ea3 | 94 | } __attribute__ ((packed)) *rtfixed; |
b2e7771e JB |
95 | struct sk_buff *skb, *skb2; |
96 | struct net_device *prev_dev = NULL; | |
97 | int present_fcs_len = 0; | |
98 | int rtap_len = 0; | |
99 | ||
100 | /* | |
101 | * First, we may need to make a copy of the skb because | |
102 | * (1) we need to modify it for radiotap (if not present), and | |
103 | * (2) the other RX handlers will modify the skb we got. | |
104 | * | |
105 | * We don't need to, of course, if we aren't going to return | |
106 | * the SKB because it has a bad FCS/PLCP checksum. | |
107 | */ | |
108 | if (status->flag & RX_FLAG_RADIOTAP) | |
109 | rtap_len = ieee80211_get_radiotap_len(origskb->data); | |
110 | else | |
c49e5ea3 JB |
111 | /* room for radiotap header, always present fields and TSFT */ |
112 | needed_headroom = sizeof(*rthdr) + sizeof(*rtfixed) + 8; | |
b2e7771e JB |
113 | |
114 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
115 | present_fcs_len = FCS_LEN; | |
116 | ||
117 | if (!local->monitors) { | |
118 | if (should_drop_frame(status, origskb, present_fcs_len, | |
119 | rtap_len)) { | |
120 | dev_kfree_skb(origskb); | |
121 | return NULL; | |
122 | } | |
123 | ||
124 | return remove_monitor_info(local, origskb, rtap_len); | |
125 | } | |
126 | ||
127 | if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) { | |
128 | /* only need to expand headroom if necessary */ | |
129 | skb = origskb; | |
130 | origskb = NULL; | |
131 | ||
132 | /* | |
133 | * This shouldn't trigger often because most devices have an | |
134 | * RX header they pull before we get here, and that should | |
135 | * be big enough for our radiotap information. We should | |
136 | * probably export the length to drivers so that we can have | |
137 | * them allocate enough headroom to start with. | |
138 | */ | |
139 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 140 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
141 | dev_kfree_skb(skb); |
142 | return NULL; | |
143 | } | |
144 | } else { | |
145 | /* | |
146 | * Need to make a copy and possibly remove radiotap header | |
147 | * and FCS from the original. | |
148 | */ | |
149 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
150 | ||
151 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
152 | ||
153 | if (!skb) | |
154 | return origskb; | |
155 | } | |
156 | ||
157 | /* if necessary, prepend radiotap information */ | |
158 | if (!(status->flag & RX_FLAG_RADIOTAP)) { | |
c49e5ea3 JB |
159 | rtfixed = (void *) skb_push(skb, sizeof(*rtfixed)); |
160 | rtap_len = sizeof(*rthdr) + sizeof(*rtfixed); | |
161 | if (status->flag & RX_FLAG_TSFT) { | |
162 | rttsft = (void *) skb_push(skb, sizeof(*rttsft)); | |
163 | rtap_len += 8; | |
164 | } | |
b2e7771e JB |
165 | rthdr = (void *) skb_push(skb, sizeof(*rthdr)); |
166 | memset(rthdr, 0, sizeof(*rthdr)); | |
c49e5ea3 JB |
167 | memset(rtfixed, 0, sizeof(*rtfixed)); |
168 | rthdr->it_present = | |
b2e7771e JB |
169 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | |
170 | (1 << IEEE80211_RADIOTAP_RATE) | | |
171 | (1 << IEEE80211_RADIOTAP_CHANNEL) | | |
172 | (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL) | | |
173 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
c49e5ea3 JB |
174 | rtfixed->flags = 0; |
175 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
176 | rtfixed->flags |= IEEE80211_RADIOTAP_F_FCS; | |
177 | ||
178 | if (rttsft) { | |
179 | *rttsft = cpu_to_le64(status->mactime); | |
180 | rthdr->it_present |= | |
181 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
182 | } | |
b2e7771e JB |
183 | |
184 | /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */ | |
c49e5ea3 | 185 | rtfixed->rx_flags = 0; |
b2e7771e JB |
186 | if (status->flag & |
187 | (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
c49e5ea3 | 188 | rtfixed->rx_flags |= |
b2e7771e JB |
189 | cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS); |
190 | ||
191 | rate = ieee80211_get_rate(local, status->phymode, | |
192 | status->rate); | |
193 | if (rate) | |
c49e5ea3 | 194 | rtfixed->rate = rate->rate / 5; |
b2e7771e | 195 | |
c49e5ea3 | 196 | rtfixed->chan_freq = cpu_to_le16(status->freq); |
b2e7771e JB |
197 | |
198 | if (status->phymode == MODE_IEEE80211A) | |
c49e5ea3 | 199 | rtfixed->chan_flags = |
b2e7771e JB |
200 | cpu_to_le16(IEEE80211_CHAN_OFDM | |
201 | IEEE80211_CHAN_5GHZ); | |
202 | else | |
c49e5ea3 | 203 | rtfixed->chan_flags = |
b2e7771e JB |
204 | cpu_to_le16(IEEE80211_CHAN_DYN | |
205 | IEEE80211_CHAN_2GHZ); | |
206 | ||
c49e5ea3 JB |
207 | rtfixed->antsignal = status->ssi; |
208 | rthdr->it_len = cpu_to_le16(rtap_len); | |
b2e7771e JB |
209 | } |
210 | ||
ce3edf6d | 211 | skb_reset_mac_header(skb); |
b2e7771e JB |
212 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
213 | skb->pkt_type = PACKET_OTHERHOST; | |
214 | skb->protocol = htons(ETH_P_802_2); | |
215 | ||
216 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
217 | if (!netif_running(sdata->dev)) | |
218 | continue; | |
219 | ||
220 | if (sdata->type != IEEE80211_IF_TYPE_MNTR) | |
221 | continue; | |
222 | ||
223 | if (prev_dev) { | |
224 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
225 | if (skb2) { | |
226 | skb2->dev = prev_dev; | |
227 | netif_rx(skb2); | |
228 | } | |
229 | } | |
230 | ||
231 | prev_dev = sdata->dev; | |
232 | sdata->dev->stats.rx_packets++; | |
233 | sdata->dev->stats.rx_bytes += skb->len; | |
234 | } | |
235 | ||
236 | if (prev_dev) { | |
237 | skb->dev = prev_dev; | |
238 | netif_rx(skb); | |
239 | } else | |
240 | dev_kfree_skb(skb); | |
241 | ||
242 | return origskb; | |
243 | } | |
244 | ||
245 | ||
571ecf67 JB |
246 | /* pre-rx handlers |
247 | * | |
248 | * these don't have dev/sdata fields in the rx data | |
52865dfd JB |
249 | * The sta value should also not be used because it may |
250 | * be NULL even though a STA (in IBSS mode) will be added. | |
571ecf67 JB |
251 | */ |
252 | ||
6e0d114d JB |
253 | static ieee80211_txrx_result |
254 | ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx) | |
255 | { | |
256 | u8 *data = rx->skb->data; | |
257 | int tid; | |
258 | ||
259 | /* does the frame have a qos control field? */ | |
260 | if (WLAN_FC_IS_QOS_DATA(rx->fc)) { | |
261 | u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN; | |
262 | /* frame has qos control */ | |
263 | tid = qc[0] & QOS_CONTROL_TID_MASK; | |
fd4c7f2f | 264 | if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) |
64bd4b69 | 265 | rx->flags |= IEEE80211_TXRXD_RX_AMSDU; |
fd4c7f2f | 266 | else |
64bd4b69 | 267 | rx->flags &= ~IEEE80211_TXRXD_RX_AMSDU; |
6e0d114d JB |
268 | } else { |
269 | if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) { | |
270 | /* Separate TID for management frames */ | |
271 | tid = NUM_RX_DATA_QUEUES - 1; | |
272 | } else { | |
273 | /* no qos control present */ | |
274 | tid = 0; /* 802.1d - Best Effort */ | |
275 | } | |
276 | } | |
52865dfd | 277 | |
6e0d114d | 278 | I802_DEBUG_INC(rx->local->wme_rx_queue[tid]); |
52865dfd JB |
279 | /* only a debug counter, sta might not be assigned properly yet */ |
280 | if (rx->sta) | |
6e0d114d | 281 | I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]); |
6e0d114d JB |
282 | |
283 | rx->u.rx.queue = tid; | |
284 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. | |
285 | * For now, set skb->priority to 0 for other cases. */ | |
286 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
287 | ||
288 | return TXRX_CONTINUE; | |
289 | } | |
290 | ||
6368e4b1 RR |
291 | |
292 | u32 ieee80211_rx_load_stats(struct ieee80211_local *local, | |
293 | struct sk_buff *skb, | |
294 | struct ieee80211_rx_status *status) | |
571ecf67 | 295 | { |
571ecf67 JB |
296 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
297 | u32 load = 0, hdrtime; | |
298 | struct ieee80211_rate *rate; | |
299 | struct ieee80211_hw_mode *mode = local->hw.conf.mode; | |
300 | int i; | |
301 | ||
302 | /* Estimate total channel use caused by this frame */ | |
303 | ||
304 | if (unlikely(mode->num_rates < 0)) | |
305 | return TXRX_CONTINUE; | |
306 | ||
307 | rate = &mode->rates[0]; | |
308 | for (i = 0; i < mode->num_rates; i++) { | |
6368e4b1 | 309 | if (mode->rates[i].val == status->rate) { |
571ecf67 JB |
310 | rate = &mode->rates[i]; |
311 | break; | |
312 | } | |
313 | } | |
314 | ||
315 | /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values, | |
316 | * 1 usec = 1/8 * (1080 / 10) = 13.5 */ | |
317 | ||
318 | if (mode->mode == MODE_IEEE80211A || | |
571ecf67 JB |
319 | (mode->mode == MODE_IEEE80211G && |
320 | rate->flags & IEEE80211_RATE_ERP)) | |
321 | hdrtime = CHAN_UTIL_HDR_SHORT; | |
322 | else | |
323 | hdrtime = CHAN_UTIL_HDR_LONG; | |
324 | ||
325 | load = hdrtime; | |
326 | if (!is_multicast_ether_addr(hdr->addr1)) | |
327 | load += hdrtime; | |
328 | ||
329 | load += skb->len * rate->rate_inv; | |
330 | ||
331 | /* Divide channel_use by 8 to avoid wrapping around the counter */ | |
332 | load >>= CHAN_UTIL_SHIFT; | |
333 | local->channel_use_raw += load; | |
571ecf67 | 334 | |
6368e4b1 | 335 | return load; |
571ecf67 JB |
336 | } |
337 | ||
338 | ieee80211_rx_handler ieee80211_rx_pre_handlers[] = | |
339 | { | |
340 | ieee80211_rx_h_parse_qos, | |
571ecf67 JB |
341 | NULL |
342 | }; | |
343 | ||
344 | /* rx handlers */ | |
345 | ||
346 | static ieee80211_txrx_result | |
347 | ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx) | |
348 | { | |
52865dfd JB |
349 | if (rx->sta) |
350 | rx->sta->channel_use_raw += rx->u.rx.load; | |
571ecf67 JB |
351 | rx->sdata->channel_use_raw += rx->u.rx.load; |
352 | return TXRX_CONTINUE; | |
353 | } | |
354 | ||
571ecf67 JB |
355 | static ieee80211_txrx_result |
356 | ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx) | |
357 | { | |
358 | struct ieee80211_local *local = rx->local; | |
359 | struct sk_buff *skb = rx->skb; | |
360 | ||
ece8eddd ZY |
361 | if (unlikely(local->sta_hw_scanning)) |
362 | return ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status); | |
363 | ||
364 | if (unlikely(local->sta_sw_scanning)) { | |
365 | /* drop all the other packets during a software scan anyway */ | |
366 | if (ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status) | |
367 | != TXRX_QUEUED) | |
368 | dev_kfree_skb(skb); | |
571ecf67 JB |
369 | return TXRX_QUEUED; |
370 | } | |
371 | ||
badffb72 | 372 | if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) { |
571ecf67 JB |
373 | /* scanning finished during invoking of handlers */ |
374 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
375 | return TXRX_DROP; | |
376 | } | |
377 | ||
378 | return TXRX_CONTINUE; | |
379 | } | |
380 | ||
381 | static ieee80211_txrx_result | |
382 | ieee80211_rx_h_check(struct ieee80211_txrx_data *rx) | |
383 | { | |
384 | struct ieee80211_hdr *hdr; | |
571ecf67 JB |
385 | hdr = (struct ieee80211_hdr *) rx->skb->data; |
386 | ||
387 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
388 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
389 | if (unlikely(rx->fc & IEEE80211_FCTL_RETRY && | |
390 | rx->sta->last_seq_ctrl[rx->u.rx.queue] == | |
391 | hdr->seq_ctrl)) { | |
badffb72 | 392 | if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) { |
571ecf67 JB |
393 | rx->local->dot11FrameDuplicateCount++; |
394 | rx->sta->num_duplicates++; | |
395 | } | |
396 | return TXRX_DROP; | |
397 | } else | |
398 | rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl; | |
399 | } | |
400 | ||
571ecf67 JB |
401 | if (unlikely(rx->skb->len < 16)) { |
402 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
403 | return TXRX_DROP; | |
404 | } | |
405 | ||
571ecf67 JB |
406 | /* Drop disallowed frame classes based on STA auth/assoc state; |
407 | * IEEE 802.11, Chap 5.5. | |
408 | * | |
409 | * 80211.o does filtering only based on association state, i.e., it | |
410 | * drops Class 3 frames from not associated stations. hostapd sends | |
411 | * deauth/disassoc frames when needed. In addition, hostapd is | |
412 | * responsible for filtering on both auth and assoc states. | |
413 | */ | |
414 | if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA || | |
415 | ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL && | |
416 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) && | |
417 | rx->sdata->type != IEEE80211_IF_TYPE_IBSS && | |
418 | (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) { | |
419 | if ((!(rx->fc & IEEE80211_FCTL_FROMDS) && | |
420 | !(rx->fc & IEEE80211_FCTL_TODS) && | |
421 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) | |
badffb72 | 422 | || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) { |
571ecf67 JB |
423 | /* Drop IBSS frames and frames for other hosts |
424 | * silently. */ | |
425 | return TXRX_DROP; | |
426 | } | |
427 | ||
f9d540ee | 428 | return TXRX_DROP; |
571ecf67 JB |
429 | } |
430 | ||
570bd537 JB |
431 | return TXRX_CONTINUE; |
432 | } | |
433 | ||
434 | ||
435 | static ieee80211_txrx_result | |
1990af8d | 436 | ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx) |
570bd537 JB |
437 | { |
438 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
3017b80b JB |
439 | int keyidx; |
440 | int hdrlen; | |
e2f036da | 441 | ieee80211_txrx_result result = TXRX_DROP; |
d4e46a3d | 442 | struct ieee80211_key *stakey = NULL; |
570bd537 | 443 | |
3017b80b JB |
444 | /* |
445 | * Key selection 101 | |
446 | * | |
447 | * There are three types of keys: | |
448 | * - GTK (group keys) | |
449 | * - PTK (pairwise keys) | |
450 | * - STK (station-to-station pairwise keys) | |
451 | * | |
452 | * When selecting a key, we have to distinguish between multicast | |
453 | * (including broadcast) and unicast frames, the latter can only | |
454 | * use PTKs and STKs while the former always use GTKs. Unless, of | |
455 | * course, actual WEP keys ("pre-RSNA") are used, then unicast | |
456 | * frames can also use key indizes like GTKs. Hence, if we don't | |
457 | * have a PTK/STK we check the key index for a WEP key. | |
458 | * | |
8dc06a1c JB |
459 | * Note that in a regular BSS, multicast frames are sent by the |
460 | * AP only, associated stations unicast the frame to the AP first | |
461 | * which then multicasts it on their behalf. | |
462 | * | |
3017b80b JB |
463 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
464 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
465 | * The spec seems to expect that one negotiates the same key with |
466 | * every station but there's no such requirement; VLANs could be | |
467 | * possible. | |
3017b80b JB |
468 | */ |
469 | ||
470 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) | |
471 | return TXRX_CONTINUE; | |
571ecf67 | 472 | |
3017b80b | 473 | /* |
1990af8d | 474 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
475 | * addressed to us nor a multicast frame. |
476 | */ | |
badffb72 | 477 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
3017b80b JB |
478 | return TXRX_CONTINUE; |
479 | ||
d4e46a3d JB |
480 | if (rx->sta) |
481 | stakey = rcu_dereference(rx->sta->key); | |
482 | ||
483 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { | |
484 | rx->key = stakey; | |
571ecf67 | 485 | } else { |
3017b80b JB |
486 | /* |
487 | * The device doesn't give us the IV so we won't be | |
488 | * able to look up the key. That's ok though, we | |
489 | * don't need to decrypt the frame, we just won't | |
490 | * be able to keep statistics accurate. | |
491 | * Except for key threshold notifications, should | |
492 | * we somehow allow the driver to tell us which key | |
493 | * the hardware used if this flag is set? | |
494 | */ | |
7848ba7d JB |
495 | if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) && |
496 | (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED)) | |
3017b80b JB |
497 | return TXRX_CONTINUE; |
498 | ||
499 | hdrlen = ieee80211_get_hdrlen(rx->fc); | |
500 | ||
501 | if (rx->skb->len < 8 + hdrlen) | |
502 | return TXRX_DROP; /* TODO: count this? */ | |
503 | ||
504 | /* | |
505 | * no need to call ieee80211_wep_get_keyidx, | |
506 | * it verifies a bunch of things we've done already | |
507 | */ | |
508 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
509 | ||
d4e46a3d | 510 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
511 | |
512 | /* | |
513 | * RSNA-protected unicast frames should always be sent with | |
514 | * pairwise or station-to-station keys, but for WEP we allow | |
515 | * using a key index as well. | |
516 | */ | |
8f20fc24 | 517 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
518 | !is_multicast_ether_addr(hdr->addr1)) |
519 | rx->key = NULL; | |
571ecf67 JB |
520 | } |
521 | ||
3017b80b | 522 | if (rx->key) { |
571ecf67 | 523 | rx->key->tx_rx_count++; |
011bfcc4 | 524 | /* TODO: add threshold stuff again */ |
1990af8d | 525 | } else { |
7f3ad894 | 526 | #ifdef CONFIG_MAC80211_DEBUG |
70f08765 JB |
527 | if (net_ratelimit()) |
528 | printk(KERN_DEBUG "%s: RX protected frame," | |
529 | " but have no key\n", rx->dev->name); | |
7f3ad894 | 530 | #endif /* CONFIG_MAC80211_DEBUG */ |
70f08765 JB |
531 | return TXRX_DROP; |
532 | } | |
533 | ||
1990af8d JB |
534 | /* Check for weak IVs if possible */ |
535 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
536 | ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) && | |
537 | (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) || | |
538 | !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) && | |
539 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) | |
540 | rx->sta->wep_weak_iv_count++; | |
541 | ||
70f08765 JB |
542 | switch (rx->key->conf.alg) { |
543 | case ALG_WEP: | |
e2f036da MN |
544 | result = ieee80211_crypto_wep_decrypt(rx); |
545 | break; | |
70f08765 | 546 | case ALG_TKIP: |
e2f036da MN |
547 | result = ieee80211_crypto_tkip_decrypt(rx); |
548 | break; | |
70f08765 | 549 | case ALG_CCMP: |
e2f036da MN |
550 | result = ieee80211_crypto_ccmp_decrypt(rx); |
551 | break; | |
70f08765 JB |
552 | } |
553 | ||
e2f036da MN |
554 | /* either the frame has been decrypted or will be dropped */ |
555 | rx->u.rx.status->flag |= RX_FLAG_DECRYPTED; | |
556 | ||
557 | return result; | |
70f08765 JB |
558 | } |
559 | ||
571ecf67 JB |
560 | static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta) |
561 | { | |
562 | struct ieee80211_sub_if_data *sdata; | |
0795af57 JP |
563 | DECLARE_MAC_BUF(mac); |
564 | ||
571ecf67 JB |
565 | sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); |
566 | ||
567 | if (sdata->bss) | |
568 | atomic_inc(&sdata->bss->num_sta_ps); | |
569 | sta->flags |= WLAN_STA_PS; | |
570 | sta->pspoll = 0; | |
571 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
572 | printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n", |
573 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 JB |
574 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
575 | } | |
576 | ||
577 | static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta) | |
578 | { | |
579 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
580 | struct sk_buff *skb; | |
581 | int sent = 0; | |
582 | struct ieee80211_sub_if_data *sdata; | |
583 | struct ieee80211_tx_packet_data *pkt_data; | |
0795af57 | 584 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
585 | |
586 | sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); | |
587 | if (sdata->bss) | |
588 | atomic_dec(&sdata->bss->num_sta_ps); | |
589 | sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM); | |
590 | sta->pspoll = 0; | |
591 | if (!skb_queue_empty(&sta->ps_tx_buf)) { | |
592 | if (local->ops->set_tim) | |
593 | local->ops->set_tim(local_to_hw(local), sta->aid, 0); | |
594 | if (sdata->bss) | |
595 | bss_tim_clear(local, sdata->bss, sta->aid); | |
596 | } | |
597 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
598 | printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n", |
599 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 JB |
600 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
601 | /* Send all buffered frames to the station */ | |
602 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
603 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; | |
604 | sent++; | |
e8bf9649 | 605 | pkt_data->flags |= IEEE80211_TXPD_REQUEUE; |
571ecf67 JB |
606 | dev_queue_xmit(skb); |
607 | } | |
608 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
609 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; | |
610 | local->total_ps_buffered--; | |
611 | sent++; | |
612 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 | 613 | printk(KERN_DEBUG "%s: STA %s aid %d send PS frame " |
571ecf67 | 614 | "since STA not sleeping anymore\n", dev->name, |
0795af57 | 615 | print_mac(mac, sta->addr), sta->aid); |
571ecf67 | 616 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
e8bf9649 | 617 | pkt_data->flags |= IEEE80211_TXPD_REQUEUE; |
571ecf67 JB |
618 | dev_queue_xmit(skb); |
619 | } | |
620 | ||
621 | return sent; | |
622 | } | |
623 | ||
624 | static ieee80211_txrx_result | |
625 | ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx) | |
626 | { | |
627 | struct sta_info *sta = rx->sta; | |
628 | struct net_device *dev = rx->dev; | |
629 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
630 | ||
631 | if (!sta) | |
632 | return TXRX_CONTINUE; | |
633 | ||
634 | /* Update last_rx only for IBSS packets which are for the current | |
635 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
636 | * other STAs are using different BSSID. */ | |
637 | if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) { | |
638 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len); | |
639 | if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0) | |
640 | sta->last_rx = jiffies; | |
641 | } else | |
642 | if (!is_multicast_ether_addr(hdr->addr1) || | |
643 | rx->sdata->type == IEEE80211_IF_TYPE_STA) { | |
644 | /* Update last_rx only for unicast frames in order to prevent | |
645 | * the Probe Request frames (the only broadcast frames from a | |
646 | * STA in infrastructure mode) from keeping a connection alive. | |
647 | */ | |
648 | sta->last_rx = jiffies; | |
649 | } | |
650 | ||
badffb72 | 651 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
571ecf67 JB |
652 | return TXRX_CONTINUE; |
653 | ||
654 | sta->rx_fragments++; | |
655 | sta->rx_bytes += rx->skb->len; | |
6c55aa97 LF |
656 | sta->last_rssi = rx->u.rx.status->ssi; |
657 | sta->last_signal = rx->u.rx.status->signal; | |
658 | sta->last_noise = rx->u.rx.status->noise; | |
571ecf67 JB |
659 | |
660 | if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) { | |
661 | /* Change STA power saving mode only in the end of a frame | |
662 | * exchange sequence */ | |
663 | if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM)) | |
664 | rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta); | |
665 | else if (!(sta->flags & WLAN_STA_PS) && | |
666 | (rx->fc & IEEE80211_FCTL_PM)) | |
667 | ap_sta_ps_start(dev, sta); | |
668 | } | |
669 | ||
670 | /* Drop data::nullfunc frames silently, since they are used only to | |
671 | * control station power saving mode. */ | |
672 | if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
673 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) { | |
674 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); | |
675 | /* Update counter and free packet here to avoid counting this | |
676 | * as a dropped packed. */ | |
677 | sta->rx_packets++; | |
678 | dev_kfree_skb(rx->skb); | |
679 | return TXRX_QUEUED; | |
680 | } | |
681 | ||
682 | return TXRX_CONTINUE; | |
683 | } /* ieee80211_rx_h_sta_process */ | |
684 | ||
571ecf67 JB |
685 | static inline struct ieee80211_fragment_entry * |
686 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
687 | unsigned int frag, unsigned int seq, int rx_queue, | |
688 | struct sk_buff **skb) | |
689 | { | |
690 | struct ieee80211_fragment_entry *entry; | |
691 | int idx; | |
692 | ||
693 | idx = sdata->fragment_next; | |
694 | entry = &sdata->fragments[sdata->fragment_next++]; | |
695 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
696 | sdata->fragment_next = 0; | |
697 | ||
698 | if (!skb_queue_empty(&entry->skb_list)) { | |
699 | #ifdef CONFIG_MAC80211_DEBUG | |
700 | struct ieee80211_hdr *hdr = | |
701 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
0795af57 JP |
702 | DECLARE_MAC_BUF(mac); |
703 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
704 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " |
705 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0795af57 | 706 | "addr1=%s addr2=%s\n", |
571ecf67 JB |
707 | sdata->dev->name, idx, |
708 | jiffies - entry->first_frag_time, entry->seq, | |
0795af57 JP |
709 | entry->last_frag, print_mac(mac, hdr->addr1), |
710 | print_mac(mac2, hdr->addr2)); | |
571ecf67 JB |
711 | #endif /* CONFIG_MAC80211_DEBUG */ |
712 | __skb_queue_purge(&entry->skb_list); | |
713 | } | |
714 | ||
715 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
716 | *skb = NULL; | |
717 | entry->first_frag_time = jiffies; | |
718 | entry->seq = seq; | |
719 | entry->rx_queue = rx_queue; | |
720 | entry->last_frag = frag; | |
721 | entry->ccmp = 0; | |
722 | entry->extra_len = 0; | |
723 | ||
724 | return entry; | |
725 | } | |
726 | ||
727 | static inline struct ieee80211_fragment_entry * | |
728 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
729 | u16 fc, unsigned int frag, unsigned int seq, | |
730 | int rx_queue, struct ieee80211_hdr *hdr) | |
731 | { | |
732 | struct ieee80211_fragment_entry *entry; | |
733 | int i, idx; | |
734 | ||
735 | idx = sdata->fragment_next; | |
736 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
737 | struct ieee80211_hdr *f_hdr; | |
738 | u16 f_fc; | |
739 | ||
740 | idx--; | |
741 | if (idx < 0) | |
742 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
743 | ||
744 | entry = &sdata->fragments[idx]; | |
745 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
746 | entry->rx_queue != rx_queue || | |
747 | entry->last_frag + 1 != frag) | |
748 | continue; | |
749 | ||
750 | f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data; | |
751 | f_fc = le16_to_cpu(f_hdr->frame_control); | |
752 | ||
753 | if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) || | |
754 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || | |
755 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
756 | continue; | |
757 | ||
758 | if (entry->first_frag_time + 2 * HZ < jiffies) { | |
759 | __skb_queue_purge(&entry->skb_list); | |
760 | continue; | |
761 | } | |
762 | return entry; | |
763 | } | |
764 | ||
765 | return NULL; | |
766 | } | |
767 | ||
768 | static ieee80211_txrx_result | |
769 | ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx) | |
770 | { | |
771 | struct ieee80211_hdr *hdr; | |
772 | u16 sc; | |
773 | unsigned int frag, seq; | |
774 | struct ieee80211_fragment_entry *entry; | |
775 | struct sk_buff *skb; | |
0795af57 | 776 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
777 | |
778 | hdr = (struct ieee80211_hdr *) rx->skb->data; | |
779 | sc = le16_to_cpu(hdr->seq_ctrl); | |
780 | frag = sc & IEEE80211_SCTL_FRAG; | |
781 | ||
782 | if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) || | |
783 | (rx->skb)->len < 24 || | |
784 | is_multicast_ether_addr(hdr->addr1))) { | |
785 | /* not fragmented */ | |
786 | goto out; | |
787 | } | |
788 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
789 | ||
790 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
791 | ||
792 | if (frag == 0) { | |
793 | /* This is the first fragment of a new frame. */ | |
794 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
795 | rx->u.rx.queue, &(rx->skb)); | |
8f20fc24 | 796 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
571ecf67 JB |
797 | (rx->fc & IEEE80211_FCTL_PROTECTED)) { |
798 | /* Store CCMP PN so that we can verify that the next | |
799 | * fragment has a sequential PN value. */ | |
800 | entry->ccmp = 1; | |
801 | memcpy(entry->last_pn, | |
802 | rx->key->u.ccmp.rx_pn[rx->u.rx.queue], | |
803 | CCMP_PN_LEN); | |
804 | } | |
805 | return TXRX_QUEUED; | |
806 | } | |
807 | ||
808 | /* This is a fragment for a frame that should already be pending in | |
809 | * fragment cache. Add this fragment to the end of the pending entry. | |
810 | */ | |
811 | entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq, | |
812 | rx->u.rx.queue, hdr); | |
813 | if (!entry) { | |
814 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
815 | return TXRX_DROP; | |
816 | } | |
817 | ||
818 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
819 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
820 | if (entry->ccmp) { | |
821 | int i; | |
822 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 823 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
571ecf67 JB |
824 | return TXRX_DROP; |
825 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); | |
826 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
827 | pn[i]++; | |
828 | if (pn[i]) | |
829 | break; | |
830 | } | |
831 | rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue]; | |
832 | if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) { | |
1a84f3fd JB |
833 | if (net_ratelimit()) |
834 | printk(KERN_DEBUG "%s: defrag: CCMP PN not " | |
0795af57 | 835 | "sequential A2=%s" |
1a84f3fd JB |
836 | " PN=%02x%02x%02x%02x%02x%02x " |
837 | "(expected %02x%02x%02x%02x%02x%02x)\n", | |
0795af57 | 838 | rx->dev->name, print_mac(mac, hdr->addr2), |
1a84f3fd JB |
839 | rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], |
840 | rpn[5], pn[0], pn[1], pn[2], pn[3], | |
841 | pn[4], pn[5]); | |
571ecf67 JB |
842 | return TXRX_DROP; |
843 | } | |
844 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); | |
845 | } | |
846 | ||
847 | skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc)); | |
848 | __skb_queue_tail(&entry->skb_list, rx->skb); | |
849 | entry->last_frag = frag; | |
850 | entry->extra_len += rx->skb->len; | |
851 | if (rx->fc & IEEE80211_FCTL_MOREFRAGS) { | |
852 | rx->skb = NULL; | |
853 | return TXRX_QUEUED; | |
854 | } | |
855 | ||
856 | rx->skb = __skb_dequeue(&entry->skb_list); | |
857 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
858 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
859 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
860 | GFP_ATOMIC))) { | |
861 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
862 | __skb_queue_purge(&entry->skb_list); | |
863 | return TXRX_DROP; | |
864 | } | |
865 | } | |
866 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
867 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
868 | dev_kfree_skb(skb); | |
869 | } | |
870 | ||
871 | /* Complete frame has been reassembled - process it now */ | |
badffb72 | 872 | rx->flags |= IEEE80211_TXRXD_FRAGMENTED; |
571ecf67 JB |
873 | |
874 | out: | |
875 | if (rx->sta) | |
876 | rx->sta->rx_packets++; | |
877 | if (is_multicast_ether_addr(hdr->addr1)) | |
878 | rx->local->dot11MulticastReceivedFrameCount++; | |
879 | else | |
880 | ieee80211_led_rx(rx->local); | |
881 | return TXRX_CONTINUE; | |
882 | } | |
883 | ||
884 | static ieee80211_txrx_result | |
885 | ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx) | |
886 | { | |
98f0b0a3 | 887 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
888 | struct sk_buff *skb; |
889 | int no_pending_pkts; | |
0795af57 | 890 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
891 | |
892 | if (likely(!rx->sta || | |
893 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL || | |
894 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL || | |
badffb72 | 895 | !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))) |
571ecf67 JB |
896 | return TXRX_CONTINUE; |
897 | ||
98f0b0a3 RR |
898 | if ((sdata->type != IEEE80211_IF_TYPE_AP) && |
899 | (sdata->type != IEEE80211_IF_TYPE_VLAN)) | |
900 | return TXRX_DROP; | |
901 | ||
571ecf67 JB |
902 | skb = skb_dequeue(&rx->sta->tx_filtered); |
903 | if (!skb) { | |
904 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
905 | if (skb) | |
906 | rx->local->total_ps_buffered--; | |
907 | } | |
908 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
909 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
910 | ||
911 | if (skb) { | |
912 | struct ieee80211_hdr *hdr = | |
913 | (struct ieee80211_hdr *) skb->data; | |
914 | ||
915 | /* tell TX path to send one frame even though the STA may | |
916 | * still remain is PS mode after this frame exchange */ | |
917 | rx->sta->pspoll = 1; | |
918 | ||
919 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
920 | printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n", |
921 | print_mac(mac, rx->sta->addr), rx->sta->aid, | |
571ecf67 JB |
922 | skb_queue_len(&rx->sta->ps_tx_buf)); |
923 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
924 | ||
925 | /* Use MoreData flag to indicate whether there are more | |
926 | * buffered frames for this STA */ | |
927 | if (no_pending_pkts) { | |
928 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); | |
929 | rx->sta->flags &= ~WLAN_STA_TIM; | |
930 | } else | |
931 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
932 | ||
933 | dev_queue_xmit(skb); | |
934 | ||
935 | if (no_pending_pkts) { | |
936 | if (rx->local->ops->set_tim) | |
937 | rx->local->ops->set_tim(local_to_hw(rx->local), | |
938 | rx->sta->aid, 0); | |
939 | if (rx->sdata->bss) | |
940 | bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid); | |
941 | } | |
942 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
943 | } else if (!rx->u.rx.sent_ps_buffered) { | |
0795af57 | 944 | printk(KERN_DEBUG "%s: STA %s sent PS Poll even " |
571ecf67 | 945 | "though there is no buffered frames for it\n", |
0795af57 | 946 | rx->dev->name, print_mac(mac, rx->sta->addr)); |
571ecf67 JB |
947 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
948 | ||
949 | } | |
950 | ||
951 | /* Free PS Poll skb here instead of returning TXRX_DROP that would | |
952 | * count as an dropped frame. */ | |
953 | dev_kfree_skb(rx->skb); | |
954 | ||
955 | return TXRX_QUEUED; | |
956 | } | |
957 | ||
6e0d114d JB |
958 | static ieee80211_txrx_result |
959 | ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx) | |
960 | { | |
961 | u16 fc = rx->fc; | |
962 | u8 *data = rx->skb->data; | |
963 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data; | |
964 | ||
965 | if (!WLAN_FC_IS_QOS_DATA(fc)) | |
966 | return TXRX_CONTINUE; | |
967 | ||
968 | /* remove the qos control field, update frame type and meta-data */ | |
969 | memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2); | |
970 | hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2); | |
971 | /* change frame type to non QOS */ | |
972 | rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA; | |
973 | hdr->frame_control = cpu_to_le16(fc); | |
974 | ||
975 | return TXRX_CONTINUE; | |
976 | } | |
977 | ||
76ee65bf | 978 | static int |
ce3edf6d | 979 | ieee80211_802_1x_port_control(struct ieee80211_txrx_data *rx) |
571ecf67 | 980 | { |
ce3edf6d JB |
981 | if (unlikely(rx->sdata->ieee802_1x_pac && |
982 | (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)))) { | |
571ecf67 | 983 | #ifdef CONFIG_MAC80211_DEBUG |
76ee65bf RR |
984 | printk(KERN_DEBUG "%s: dropped frame " |
985 | "(unauthorized port)\n", rx->dev->name); | |
571ecf67 | 986 | #endif /* CONFIG_MAC80211_DEBUG */ |
76ee65bf | 987 | return -EACCES; |
571ecf67 JB |
988 | } |
989 | ||
76ee65bf | 990 | return 0; |
571ecf67 JB |
991 | } |
992 | ||
76ee65bf | 993 | static int |
ce3edf6d | 994 | ieee80211_drop_unencrypted(struct ieee80211_txrx_data *rx) |
571ecf67 | 995 | { |
3017b80b | 996 | /* |
7848ba7d JB |
997 | * Pass through unencrypted frames if the hardware has |
998 | * decrypted them already. | |
3017b80b | 999 | */ |
7848ba7d | 1000 | if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1001 | return 0; |
571ecf67 JB |
1002 | |
1003 | /* Drop unencrypted frames if key is set. */ | |
1004 | if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) && | |
1005 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
1006 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC && | |
ce3edf6d | 1007 | (rx->key || rx->sdata->drop_unencrypted))) { |
1a84f3fd JB |
1008 | if (net_ratelimit()) |
1009 | printk(KERN_DEBUG "%s: RX non-WEP frame, but expected " | |
1010 | "encryption\n", rx->dev->name); | |
76ee65bf | 1011 | return -EACCES; |
571ecf67 | 1012 | } |
76ee65bf | 1013 | return 0; |
571ecf67 JB |
1014 | } |
1015 | ||
76ee65bf RR |
1016 | static int |
1017 | ieee80211_data_to_8023(struct ieee80211_txrx_data *rx) | |
571ecf67 JB |
1018 | { |
1019 | struct net_device *dev = rx->dev; | |
571ecf67 JB |
1020 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; |
1021 | u16 fc, hdrlen, ethertype; | |
1022 | u8 *payload; | |
1023 | u8 dst[ETH_ALEN]; | |
1024 | u8 src[ETH_ALEN]; | |
76ee65bf | 1025 | struct sk_buff *skb = rx->skb; |
571ecf67 | 1026 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
0795af57 JP |
1027 | DECLARE_MAC_BUF(mac); |
1028 | DECLARE_MAC_BUF(mac2); | |
1029 | DECLARE_MAC_BUF(mac3); | |
1030 | DECLARE_MAC_BUF(mac4); | |
571ecf67 JB |
1031 | |
1032 | fc = rx->fc; | |
571ecf67 JB |
1033 | |
1034 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
76ee65bf | 1035 | return -1; |
571ecf67 JB |
1036 | |
1037 | hdrlen = ieee80211_get_hdrlen(fc); | |
1038 | ||
1039 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
1040 | * header | |
1041 | * IEEE 802.11 address fields: | |
1042 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
1043 | * 0 0 DA SA BSSID n/a | |
1044 | * 0 1 DA BSSID SA n/a | |
1045 | * 1 0 BSSID SA DA n/a | |
1046 | * 1 1 RA TA DA SA | |
1047 | */ | |
1048 | ||
1049 | switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
1050 | case IEEE80211_FCTL_TODS: | |
1051 | /* BSSID SA DA */ | |
1052 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1053 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1054 | ||
1055 | if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP && | |
1056 | sdata->type != IEEE80211_IF_TYPE_VLAN)) { | |
1a84f3fd JB |
1057 | if (net_ratelimit()) |
1058 | printk(KERN_DEBUG "%s: dropped ToDS frame " | |
0795af57 | 1059 | "(BSSID=%s SA=%s DA=%s)\n", |
1a84f3fd | 1060 | dev->name, |
0795af57 JP |
1061 | print_mac(mac, hdr->addr1), |
1062 | print_mac(mac2, hdr->addr2), | |
1063 | print_mac(mac3, hdr->addr3)); | |
76ee65bf | 1064 | return -1; |
571ecf67 JB |
1065 | } |
1066 | break; | |
1067 | case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
1068 | /* RA TA DA SA */ | |
1069 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1070 | memcpy(src, hdr->addr4, ETH_ALEN); | |
1071 | ||
1072 | if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) { | |
1a84f3fd JB |
1073 | if (net_ratelimit()) |
1074 | printk(KERN_DEBUG "%s: dropped FromDS&ToDS " | |
0795af57 | 1075 | "frame (RA=%s TA=%s DA=%s SA=%s)\n", |
1a84f3fd | 1076 | rx->dev->name, |
0795af57 JP |
1077 | print_mac(mac, hdr->addr1), |
1078 | print_mac(mac2, hdr->addr2), | |
1079 | print_mac(mac3, hdr->addr3), | |
1080 | print_mac(mac4, hdr->addr4)); | |
76ee65bf | 1081 | return -1; |
571ecf67 JB |
1082 | } |
1083 | break; | |
1084 | case IEEE80211_FCTL_FROMDS: | |
1085 | /* DA BSSID SA */ | |
1086 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1087 | memcpy(src, hdr->addr3, ETH_ALEN); | |
1088 | ||
b3316157 JL |
1089 | if (sdata->type != IEEE80211_IF_TYPE_STA || |
1090 | (is_multicast_ether_addr(dst) && | |
1091 | !compare_ether_addr(src, dev->dev_addr))) | |
76ee65bf | 1092 | return -1; |
571ecf67 JB |
1093 | break; |
1094 | case 0: | |
1095 | /* DA SA BSSID */ | |
1096 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1097 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1098 | ||
1099 | if (sdata->type != IEEE80211_IF_TYPE_IBSS) { | |
1100 | if (net_ratelimit()) { | |
0795af57 JP |
1101 | printk(KERN_DEBUG "%s: dropped IBSS frame " |
1102 | "(DA=%s SA=%s BSSID=%s)\n", | |
1103 | dev->name, | |
1104 | print_mac(mac, hdr->addr1), | |
1105 | print_mac(mac2, hdr->addr2), | |
1106 | print_mac(mac3, hdr->addr3)); | |
571ecf67 | 1107 | } |
76ee65bf | 1108 | return -1; |
571ecf67 JB |
1109 | } |
1110 | break; | |
1111 | } | |
1112 | ||
571ecf67 JB |
1113 | if (unlikely(skb->len - hdrlen < 8)) { |
1114 | if (net_ratelimit()) { | |
1115 | printk(KERN_DEBUG "%s: RX too short data frame " | |
1116 | "payload\n", dev->name); | |
1117 | } | |
76ee65bf | 1118 | return -1; |
571ecf67 JB |
1119 | } |
1120 | ||
76ee65bf | 1121 | payload = skb->data + hdrlen; |
571ecf67 JB |
1122 | ethertype = (payload[6] << 8) | payload[7]; |
1123 | ||
1124 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1125 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1126 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1127 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1128 | * replace EtherType */ | |
1129 | skb_pull(skb, hdrlen + 6); | |
1130 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1131 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1132 | } else { | |
1133 | struct ethhdr *ehdr; | |
1134 | __be16 len; | |
ce3edf6d | 1135 | |
571ecf67 JB |
1136 | skb_pull(skb, hdrlen); |
1137 | len = htons(skb->len); | |
1138 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1139 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1140 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1141 | ehdr->h_proto = len; | |
1142 | } | |
76ee65bf RR |
1143 | return 0; |
1144 | } | |
571ecf67 | 1145 | |
ce3edf6d JB |
1146 | /* |
1147 | * requires that rx->skb is a frame with ethernet header | |
1148 | */ | |
1149 | static bool ieee80211_frame_allowed(struct ieee80211_txrx_data *rx) | |
1150 | { | |
1151 | static const u8 pae_group_addr[ETH_ALEN] | |
1152 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; | |
1153 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1154 | ||
1155 | /* | |
1156 | * Allow EAPOL frames to us/the PAE group address regardless | |
1157 | * of whether the frame was encrypted or not. | |
1158 | */ | |
1159 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1160 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1161 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1162 | return true; | |
1163 | ||
1164 | if (ieee80211_802_1x_port_control(rx) || | |
1165 | ieee80211_drop_unencrypted(rx)) | |
1166 | return false; | |
1167 | ||
1168 | return true; | |
1169 | } | |
1170 | ||
1171 | /* | |
1172 | * requires that rx->skb is a frame with ethernet header | |
1173 | */ | |
76ee65bf RR |
1174 | static void |
1175 | ieee80211_deliver_skb(struct ieee80211_txrx_data *rx) | |
1176 | { | |
1177 | struct net_device *dev = rx->dev; | |
1178 | struct ieee80211_local *local = rx->local; | |
1179 | struct sk_buff *skb, *xmit_skb; | |
1180 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1181 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1182 | struct sta_info *dsta; | |
571ecf67 | 1183 | |
76ee65bf RR |
1184 | skb = rx->skb; |
1185 | xmit_skb = NULL; | |
571ecf67 | 1186 | |
ce3edf6d JB |
1187 | if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP || |
1188 | sdata->type == IEEE80211_IF_TYPE_VLAN) && | |
badffb72 | 1189 | (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) { |
ce3edf6d JB |
1190 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1191 | /* | |
1192 | * send multicast frames both to higher layers in | |
1193 | * local net stack and back to the wireless medium | |
1194 | */ | |
76ee65bf RR |
1195 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1196 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1197 | printk(KERN_DEBUG "%s: failed to clone " |
1198 | "multicast frame\n", dev->name); | |
1199 | } else { | |
571ecf67 | 1200 | dsta = sta_info_get(local, skb->data); |
ce3edf6d JB |
1201 | if (dsta && dsta->dev == dev) { |
1202 | /* | |
1203 | * The destination station is associated to | |
1204 | * this AP (in this VLAN), so send the frame | |
1205 | * directly to it and do not pass it to local | |
1206 | * net stack. | |
571ecf67 | 1207 | */ |
76ee65bf | 1208 | xmit_skb = skb; |
571ecf67 JB |
1209 | skb = NULL; |
1210 | } | |
1211 | if (dsta) | |
1212 | sta_info_put(dsta); | |
1213 | } | |
1214 | } | |
1215 | ||
1216 | if (skb) { | |
1217 | /* deliver to local stack */ | |
1218 | skb->protocol = eth_type_trans(skb, dev); | |
1219 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1220 | netif_rx(skb); | |
1221 | } | |
1222 | ||
76ee65bf | 1223 | if (xmit_skb) { |
571ecf67 | 1224 | /* send to wireless media */ |
f831e909 | 1225 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1226 | skb_reset_network_header(xmit_skb); |
1227 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1228 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1229 | } |
76ee65bf RR |
1230 | } |
1231 | ||
fd4c7f2f RR |
1232 | static ieee80211_txrx_result |
1233 | ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx) | |
1234 | { | |
1235 | struct net_device *dev = rx->dev; | |
1236 | struct ieee80211_local *local = rx->local; | |
1237 | u16 fc, ethertype; | |
1238 | u8 *payload; | |
1239 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
1240 | const struct ethhdr *eth; | |
1241 | int remaining, err; | |
1242 | u8 dst[ETH_ALEN]; | |
1243 | u8 src[ETH_ALEN]; | |
1244 | DECLARE_MAC_BUF(mac); | |
1245 | ||
1246 | fc = rx->fc; | |
1247 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
1248 | return TXRX_CONTINUE; | |
1249 | ||
1250 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
1251 | return TXRX_DROP; | |
1252 | ||
64bd4b69 | 1253 | if (!(rx->flags & IEEE80211_TXRXD_RX_AMSDU)) |
fd4c7f2f RR |
1254 | return TXRX_CONTINUE; |
1255 | ||
1256 | err = ieee80211_data_to_8023(rx); | |
1257 | if (unlikely(err)) | |
1258 | return TXRX_DROP; | |
1259 | ||
1260 | skb->dev = dev; | |
1261 | ||
1262 | dev->stats.rx_packets++; | |
1263 | dev->stats.rx_bytes += skb->len; | |
1264 | ||
1265 | /* skip the wrapping header */ | |
1266 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1267 | if (!eth) | |
1268 | return TXRX_DROP; | |
1269 | ||
1270 | while (skb != frame) { | |
1271 | u8 padding; | |
1272 | __be16 len = eth->h_proto; | |
1273 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1274 | ||
1275 | remaining = skb->len; | |
1276 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1277 | memcpy(src, eth->h_source, ETH_ALEN); | |
1278 | ||
1279 | padding = ((4 - subframe_len) & 0x3); | |
1280 | /* the last MSDU has no padding */ | |
1281 | if (subframe_len > remaining) { | |
1282 | printk(KERN_DEBUG "%s: wrong buffer size", dev->name); | |
1283 | return TXRX_DROP; | |
1284 | } | |
1285 | ||
1286 | skb_pull(skb, sizeof(struct ethhdr)); | |
1287 | /* if last subframe reuse skb */ | |
1288 | if (remaining <= subframe_len + padding) | |
1289 | frame = skb; | |
1290 | else { | |
1291 | frame = dev_alloc_skb(local->hw.extra_tx_headroom + | |
1292 | subframe_len); | |
1293 | ||
1294 | if (frame == NULL) | |
1295 | return TXRX_DROP; | |
1296 | ||
1297 | skb_reserve(frame, local->hw.extra_tx_headroom + | |
1298 | sizeof(struct ethhdr)); | |
1299 | memcpy(skb_put(frame, ntohs(len)), skb->data, | |
1300 | ntohs(len)); | |
1301 | ||
1302 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1303 | padding); | |
1304 | if (!eth) { | |
1305 | printk(KERN_DEBUG "%s: wrong buffer size ", | |
1306 | dev->name); | |
1307 | dev_kfree_skb(frame); | |
1308 | return TXRX_DROP; | |
1309 | } | |
1310 | } | |
1311 | ||
ce3edf6d | 1312 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1313 | frame->dev = dev; |
1314 | frame->priority = skb->priority; | |
1315 | rx->skb = frame; | |
1316 | ||
fd4c7f2f RR |
1317 | payload = frame->data; |
1318 | ethertype = (payload[6] << 8) | payload[7]; | |
1319 | ||
1320 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1321 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1322 | compare_ether_addr(payload, | |
1323 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1324 | /* remove RFC1042 or Bridge-Tunnel |
1325 | * encapsulation and replace EtherType */ | |
1326 | skb_pull(frame, 6); | |
1327 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1328 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1329 | } else { | |
ce3edf6d JB |
1330 | memcpy(skb_push(frame, sizeof(__be16)), |
1331 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1332 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1333 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1334 | } | |
1335 | ||
ce3edf6d JB |
1336 | if (!ieee80211_frame_allowed(rx)) { |
1337 | if (skb == frame) /* last frame */ | |
1338 | return TXRX_DROP; | |
1339 | dev_kfree_skb(frame); | |
1340 | continue; | |
1341 | } | |
fd4c7f2f RR |
1342 | |
1343 | ieee80211_deliver_skb(rx); | |
1344 | } | |
1345 | ||
1346 | return TXRX_QUEUED; | |
1347 | } | |
1348 | ||
76ee65bf RR |
1349 | static ieee80211_txrx_result |
1350 | ieee80211_rx_h_data(struct ieee80211_txrx_data *rx) | |
1351 | { | |
1352 | struct net_device *dev = rx->dev; | |
1353 | u16 fc; | |
ce3edf6d | 1354 | int err; |
76ee65bf RR |
1355 | |
1356 | fc = rx->fc; | |
1357 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
1358 | return TXRX_CONTINUE; | |
1359 | ||
1360 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
1361 | return TXRX_DROP; | |
1362 | ||
76ee65bf RR |
1363 | err = ieee80211_data_to_8023(rx); |
1364 | if (unlikely(err)) | |
1365 | return TXRX_DROP; | |
1366 | ||
ce3edf6d JB |
1367 | if (!ieee80211_frame_allowed(rx)) |
1368 | return TXRX_DROP; | |
1369 | ||
76ee65bf RR |
1370 | rx->skb->dev = dev; |
1371 | ||
1372 | dev->stats.rx_packets++; | |
1373 | dev->stats.rx_bytes += rx->skb->len; | |
1374 | ||
1375 | ieee80211_deliver_skb(rx); | |
571ecf67 JB |
1376 | |
1377 | return TXRX_QUEUED; | |
1378 | } | |
1379 | ||
1380 | static ieee80211_txrx_result | |
1381 | ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx) | |
1382 | { | |
1383 | struct ieee80211_sub_if_data *sdata; | |
1384 | ||
badffb72 | 1385 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
571ecf67 JB |
1386 | return TXRX_DROP; |
1387 | ||
1388 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1389 | if ((sdata->type == IEEE80211_IF_TYPE_STA || | |
1390 | sdata->type == IEEE80211_IF_TYPE_IBSS) && | |
ddd3d2be | 1391 | !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)) |
571ecf67 | 1392 | ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status); |
f9d540ee JB |
1393 | else |
1394 | return TXRX_DROP; | |
1395 | ||
571ecf67 JB |
1396 | return TXRX_QUEUED; |
1397 | } | |
1398 | ||
1399 | static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers( | |
1400 | struct ieee80211_local *local, | |
1401 | ieee80211_rx_handler *handlers, | |
1402 | struct ieee80211_txrx_data *rx, | |
1403 | struct sta_info *sta) | |
1404 | { | |
1405 | ieee80211_rx_handler *handler; | |
1406 | ieee80211_txrx_result res = TXRX_DROP; | |
1407 | ||
1408 | for (handler = handlers; *handler != NULL; handler++) { | |
1409 | res = (*handler)(rx); | |
8e6f0032 JB |
1410 | |
1411 | switch (res) { | |
1412 | case TXRX_CONTINUE: | |
1413 | continue; | |
1414 | case TXRX_DROP: | |
1415 | I802_DEBUG_INC(local->rx_handlers_drop); | |
1416 | if (sta) | |
1417 | sta->rx_dropped++; | |
1418 | break; | |
1419 | case TXRX_QUEUED: | |
1420 | I802_DEBUG_INC(local->rx_handlers_queued); | |
571ecf67 JB |
1421 | break; |
1422 | } | |
8e6f0032 | 1423 | break; |
571ecf67 JB |
1424 | } |
1425 | ||
8e6f0032 | 1426 | if (res == TXRX_DROP) |
571ecf67 | 1427 | dev_kfree_skb(rx->skb); |
571ecf67 JB |
1428 | return res; |
1429 | } | |
1430 | ||
1431 | static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local, | |
1432 | ieee80211_rx_handler *handlers, | |
1433 | struct ieee80211_txrx_data *rx, | |
1434 | struct sta_info *sta) | |
1435 | { | |
1436 | if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) == | |
1437 | TXRX_CONTINUE) | |
1438 | dev_kfree_skb(rx->skb); | |
1439 | } | |
1440 | ||
1441 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, | |
1442 | struct ieee80211_hdr *hdr, | |
1443 | struct sta_info *sta, | |
1444 | struct ieee80211_txrx_data *rx) | |
1445 | { | |
1446 | int keyidx, hdrlen; | |
0795af57 JP |
1447 | DECLARE_MAC_BUF(mac); |
1448 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
1449 | |
1450 | hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb); | |
1451 | if (rx->skb->len >= hdrlen + 4) | |
1452 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1453 | else | |
1454 | keyidx = -1; | |
1455 | ||
1a84f3fd JB |
1456 | if (net_ratelimit()) |
1457 | printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC " | |
0795af57 JP |
1458 | "failure from %s to %s keyidx=%d\n", |
1459 | dev->name, print_mac(mac, hdr->addr2), | |
1460 | print_mac(mac2, hdr->addr1), keyidx); | |
571ecf67 JB |
1461 | |
1462 | if (!sta) { | |
aa0daf0e JB |
1463 | /* |
1464 | * Some hardware seem to generate incorrect Michael MIC | |
1465 | * reports; ignore them to avoid triggering countermeasures. | |
1466 | */ | |
1a84f3fd JB |
1467 | if (net_ratelimit()) |
1468 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
0795af57 JP |
1469 | "error for unknown address %s\n", |
1470 | dev->name, print_mac(mac, hdr->addr2)); | |
571ecf67 JB |
1471 | goto ignore; |
1472 | } | |
1473 | ||
1474 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) { | |
1a84f3fd JB |
1475 | if (net_ratelimit()) |
1476 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
aa0daf0e | 1477 | "error for a frame with no PROTECTED flag (src " |
0795af57 | 1478 | "%s)\n", dev->name, print_mac(mac, hdr->addr2)); |
571ecf67 JB |
1479 | goto ignore; |
1480 | } | |
1481 | ||
7848ba7d | 1482 | if (rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) { |
aa0daf0e JB |
1483 | /* |
1484 | * APs with pairwise keys should never receive Michael MIC | |
1485 | * errors for non-zero keyidx because these are reserved for | |
1486 | * group keys and only the AP is sending real multicast | |
1487 | * frames in the BSS. | |
1488 | */ | |
eb063c17 JB |
1489 | if (net_ratelimit()) |
1490 | printk(KERN_DEBUG "%s: ignored Michael MIC error for " | |
1491 | "a frame with non-zero keyidx (%d)" | |
0795af57 JP |
1492 | " (src %s)\n", dev->name, keyidx, |
1493 | print_mac(mac, hdr->addr2)); | |
eb063c17 | 1494 | goto ignore; |
571ecf67 JB |
1495 | } |
1496 | ||
1497 | if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA && | |
1498 | ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || | |
1499 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) { | |
1a84f3fd JB |
1500 | if (net_ratelimit()) |
1501 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
1502 | "error for a frame that cannot be encrypted " | |
0795af57 JP |
1503 | "(fc=0x%04x) (src %s)\n", |
1504 | dev->name, rx->fc, print_mac(mac, hdr->addr2)); | |
571ecf67 JB |
1505 | goto ignore; |
1506 | } | |
1507 | ||
eb063c17 | 1508 | mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr); |
571ecf67 JB |
1509 | ignore: |
1510 | dev_kfree_skb(rx->skb); | |
1511 | rx->skb = NULL; | |
1512 | } | |
1513 | ||
1514 | ieee80211_rx_handler ieee80211_rx_handlers[] = | |
1515 | { | |
1516 | ieee80211_rx_h_if_stats, | |
571ecf67 JB |
1517 | ieee80211_rx_h_passive_scan, |
1518 | ieee80211_rx_h_check, | |
4f0d18e2 | 1519 | ieee80211_rx_h_decrypt, |
70f08765 | 1520 | ieee80211_rx_h_sta_process, |
571ecf67 JB |
1521 | ieee80211_rx_h_defragment, |
1522 | ieee80211_rx_h_ps_poll, | |
1523 | ieee80211_rx_h_michael_mic_verify, | |
1524 | /* this must be after decryption - so header is counted in MPDU mic | |
1525 | * must be before pae and data, so QOS_DATA format frames | |
1526 | * are not passed to user space by these functions | |
1527 | */ | |
1528 | ieee80211_rx_h_remove_qos_control, | |
fd4c7f2f | 1529 | ieee80211_rx_h_amsdu, |
571ecf67 JB |
1530 | ieee80211_rx_h_data, |
1531 | ieee80211_rx_h_mgmt, | |
1532 | NULL | |
1533 | }; | |
1534 | ||
1535 | /* main receive path */ | |
1536 | ||
23a24def JB |
1537 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
1538 | u8 *bssid, struct ieee80211_txrx_data *rx, | |
1539 | struct ieee80211_hdr *hdr) | |
1540 | { | |
1541 | int multicast = is_multicast_ether_addr(hdr->addr1); | |
1542 | ||
1543 | switch (sdata->type) { | |
1544 | case IEEE80211_IF_TYPE_STA: | |
1545 | if (!bssid) | |
1546 | return 0; | |
1547 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
badffb72 | 1548 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1549 | return 0; |
badffb72 | 1550 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1551 | } else if (!multicast && |
1552 | compare_ether_addr(sdata->dev->dev_addr, | |
1553 | hdr->addr1) != 0) { | |
4150c572 | 1554 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1555 | return 0; |
badffb72 | 1556 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1557 | } |
1558 | break; | |
1559 | case IEEE80211_IF_TYPE_IBSS: | |
1560 | if (!bssid) | |
1561 | return 0; | |
1562 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
badffb72 | 1563 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1564 | return 0; |
badffb72 | 1565 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1566 | } else if (!multicast && |
1567 | compare_ether_addr(sdata->dev->dev_addr, | |
1568 | hdr->addr1) != 0) { | |
4150c572 | 1569 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1570 | return 0; |
badffb72 | 1571 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1572 | } else if (!rx->sta) |
1573 | rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb, | |
1574 | bssid, hdr->addr2); | |
1575 | break; | |
fb1c1cd6 | 1576 | case IEEE80211_IF_TYPE_VLAN: |
23a24def JB |
1577 | case IEEE80211_IF_TYPE_AP: |
1578 | if (!bssid) { | |
1579 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1580 | hdr->addr1)) | |
1581 | return 0; | |
1582 | } else if (!ieee80211_bssid_match(bssid, | |
1583 | sdata->dev->dev_addr)) { | |
badffb72 | 1584 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1585 | return 0; |
badffb72 | 1586 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def | 1587 | } |
badffb72 JS |
1588 | if (sdata->dev == sdata->local->mdev && |
1589 | !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) | |
23a24def JB |
1590 | /* do not receive anything via |
1591 | * master device when not scanning */ | |
1592 | return 0; | |
1593 | break; | |
1594 | case IEEE80211_IF_TYPE_WDS: | |
1595 | if (bssid || | |
1596 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) | |
1597 | return 0; | |
1598 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
1599 | return 0; | |
1600 | break; | |
fb1c1cd6 JB |
1601 | case IEEE80211_IF_TYPE_MNTR: |
1602 | /* take everything */ | |
1603 | break; | |
a2897552 | 1604 | case IEEE80211_IF_TYPE_INVALID: |
fb1c1cd6 JB |
1605 | /* should never get here */ |
1606 | WARN_ON(1); | |
1607 | break; | |
23a24def JB |
1608 | } |
1609 | ||
1610 | return 1; | |
1611 | } | |
1612 | ||
571ecf67 | 1613 | /* |
6368e4b1 RR |
1614 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
1615 | * be called with rcu_read_lock protection. | |
571ecf67 | 1616 | */ |
6368e4b1 RR |
1617 | void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, struct sk_buff *skb, |
1618 | struct ieee80211_rx_status *status, u32 load) | |
571ecf67 JB |
1619 | { |
1620 | struct ieee80211_local *local = hw_to_local(hw); | |
1621 | struct ieee80211_sub_if_data *sdata; | |
1622 | struct sta_info *sta; | |
1623 | struct ieee80211_hdr *hdr; | |
1624 | struct ieee80211_txrx_data rx; | |
1625 | u16 type; | |
6368e4b1 | 1626 | int prepares; |
8e6f0032 JB |
1627 | struct ieee80211_sub_if_data *prev = NULL; |
1628 | struct sk_buff *skb_new; | |
1629 | u8 *bssid; | |
d10f2150 | 1630 | int hdrlen; |
571ecf67 JB |
1631 | |
1632 | hdr = (struct ieee80211_hdr *) skb->data; | |
1633 | memset(&rx, 0, sizeof(rx)); | |
1634 | rx.skb = skb; | |
1635 | rx.local = local; | |
1636 | ||
1637 | rx.u.rx.status = status; | |
6368e4b1 | 1638 | rx.u.rx.load = load; |
b2e7771e | 1639 | rx.fc = le16_to_cpu(hdr->frame_control); |
571ecf67 | 1640 | type = rx.fc & IEEE80211_FCTL_FTYPE; |
72abd81b | 1641 | |
d10f2150 DM |
1642 | /* |
1643 | * Drivers are required to align the payload data to a four-byte | |
1644 | * boundary, so the last two bits of the address where it starts | |
1645 | * may not be set. The header is required to be directly before | |
1646 | * the payload data, padding like atheros hardware adds which is | |
1647 | * inbetween the 802.11 header and the payload is not supported, | |
1648 | * the driver is required to move the 802.11 header further back | |
1649 | * in that case. | |
1650 | */ | |
1651 | hdrlen = ieee80211_get_hdrlen(rx.fc); | |
1652 | WARN_ON_ONCE(((unsigned long)(skb->data + hdrlen)) & 3); | |
1653 | ||
b2e7771e | 1654 | if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT) |
571ecf67 | 1655 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 1656 | |
b2e7771e JB |
1657 | sta = rx.sta = sta_info_get(local, hdr->addr2); |
1658 | if (sta) { | |
1659 | rx.dev = rx.sta->dev; | |
1660 | rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev); | |
1661 | } | |
571ecf67 | 1662 | |
571ecf67 JB |
1663 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
1664 | ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx); | |
1665 | goto end; | |
1666 | } | |
1667 | ||
ece8eddd | 1668 | if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning)) |
badffb72 | 1669 | rx.flags |= IEEE80211_TXRXD_RXIN_SCAN; |
571ecf67 JB |
1670 | |
1671 | if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx, | |
1672 | sta) != TXRX_CONTINUE) | |
1673 | goto end; | |
1674 | skb = rx.skb; | |
1675 | ||
c9ee23df | 1676 | if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) && |
53918994 JB |
1677 | !atomic_read(&local->iff_promiscs) && |
1678 | !is_multicast_ether_addr(hdr->addr1)) { | |
badffb72 | 1679 | rx.flags |= IEEE80211_TXRXD_RXRA_MATCH; |
571ecf67 | 1680 | ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx, |
23a24def | 1681 | rx.sta); |
8e6f0032 | 1682 | sta_info_put(sta); |
d4e46a3d | 1683 | rcu_read_unlock(); |
8e6f0032 JB |
1684 | return; |
1685 | } | |
1686 | ||
b2e7771e | 1687 | bssid = ieee80211_get_bssid(hdr, skb->len); |
8e6f0032 | 1688 | |
79010420 | 1689 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
1690 | if (!netif_running(sdata->dev)) |
1691 | continue; | |
1692 | ||
b2e7771e JB |
1693 | if (sdata->type == IEEE80211_IF_TYPE_MNTR) |
1694 | continue; | |
1695 | ||
1696 | rx.flags |= IEEE80211_TXRXD_RXRA_MATCH; | |
6368e4b1 | 1697 | prepares = prepare_for_handlers(sdata, bssid, &rx, hdr); |
23a24def JB |
1698 | /* prepare_for_handlers can change sta */ |
1699 | sta = rx.sta; | |
1700 | ||
6368e4b1 | 1701 | if (!prepares) |
23a24def | 1702 | continue; |
8e6f0032 | 1703 | |
340e11f3 JB |
1704 | /* |
1705 | * frame is destined for this interface, but if it's not | |
1706 | * also for the previous one we handle that after the | |
1707 | * loop to avoid copying the SKB once too much | |
1708 | */ | |
1709 | ||
1710 | if (!prev) { | |
1711 | prev = sdata; | |
1712 | continue; | |
8e6f0032 | 1713 | } |
340e11f3 JB |
1714 | |
1715 | /* | |
1716 | * frame was destined for the previous interface | |
1717 | * so invoke RX handlers for it | |
1718 | */ | |
1719 | ||
1720 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
1721 | if (!skb_new) { | |
1722 | if (net_ratelimit()) | |
1723 | printk(KERN_DEBUG "%s: failed to copy " | |
1724 | "multicast frame for %s", | |
dd1cd4c6 JB |
1725 | wiphy_name(local->hw.wiphy), |
1726 | prev->dev->name); | |
340e11f3 JB |
1727 | continue; |
1728 | } | |
69f817b6 | 1729 | rx.fc = le16_to_cpu(hdr->frame_control); |
340e11f3 JB |
1730 | rx.skb = skb_new; |
1731 | rx.dev = prev->dev; | |
1732 | rx.sdata = prev; | |
1733 | ieee80211_invoke_rx_handlers(local, local->rx_handlers, | |
1734 | &rx, sta); | |
8e6f0032 | 1735 | prev = sdata; |
571ecf67 | 1736 | } |
8e6f0032 | 1737 | if (prev) { |
69f817b6 | 1738 | rx.fc = le16_to_cpu(hdr->frame_control); |
8e6f0032 JB |
1739 | rx.skb = skb; |
1740 | rx.dev = prev->dev; | |
1741 | rx.sdata = prev; | |
1742 | ieee80211_invoke_rx_handlers(local, local->rx_handlers, | |
1743 | &rx, sta); | |
1744 | } else | |
1745 | dev_kfree_skb(skb); | |
571ecf67 | 1746 | |
8e6f0032 | 1747 | end: |
571ecf67 JB |
1748 | if (sta) |
1749 | sta_info_put(sta); | |
1750 | } | |
6368e4b1 RR |
1751 | |
1752 | /* | |
1753 | * This is the receive path handler. It is called by a low level driver when an | |
1754 | * 802.11 MPDU is received from the hardware. | |
1755 | */ | |
1756 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
1757 | struct ieee80211_rx_status *status) | |
1758 | { | |
1759 | struct ieee80211_local *local = hw_to_local(hw); | |
1760 | u32 pkt_load; | |
1761 | ||
1762 | /* | |
1763 | * key references and virtual interfaces are protected using RCU | |
1764 | * and this requires that we are in a read-side RCU section during | |
1765 | * receive processing | |
1766 | */ | |
1767 | rcu_read_lock(); | |
1768 | ||
1769 | /* | |
1770 | * Frames with failed FCS/PLCP checksum are not returned, | |
1771 | * all other frames are returned without radiotap header | |
1772 | * if it was previously present. | |
1773 | * Also, frames with less than 16 bytes are dropped. | |
1774 | */ | |
1775 | skb = ieee80211_rx_monitor(local, skb, status); | |
1776 | if (!skb) { | |
1777 | rcu_read_unlock(); | |
1778 | return; | |
1779 | } | |
1780 | ||
1781 | pkt_load = ieee80211_rx_load_stats(local, skb, status); | |
1782 | ||
1783 | __ieee80211_rx_handle_packet(hw, skb, status, pkt_load); | |
1784 | ||
1785 | rcu_read_unlock(); | |
1786 | } | |
571ecf67 JB |
1787 | EXPORT_SYMBOL(__ieee80211_rx); |
1788 | ||
1789 | /* This is a version of the rx handler that can be called from hard irq | |
1790 | * context. Post the skb on the queue and schedule the tasklet */ | |
1791 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
1792 | struct ieee80211_rx_status *status) | |
1793 | { | |
1794 | struct ieee80211_local *local = hw_to_local(hw); | |
1795 | ||
1796 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
1797 | ||
1798 | skb->dev = local->mdev; | |
1799 | /* copy status into skb->cb for use by tasklet */ | |
1800 | memcpy(skb->cb, status, sizeof(*status)); | |
1801 | skb->pkt_type = IEEE80211_RX_MSG; | |
1802 | skb_queue_tail(&local->skb_queue, skb); | |
1803 | tasklet_schedule(&local->tasklet); | |
1804 | } | |
1805 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |