]>
Commit | Line | Data |
---|---|---|
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; | |
64 | if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FTYPE)) == | |
65 | cpu_to_le16(IEEE80211_FTYPE_CTL)) | |
66 | return 1; | |
67 | return 0; | |
68 | } | |
69 | ||
70 | /* | |
71 | * This function copies a received frame to all monitor interfaces and | |
72 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
73 | * radiotap header the driver might have added. | |
74 | */ | |
75 | static struct sk_buff * | |
76 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
77 | struct ieee80211_rx_status *status) | |
78 | { | |
79 | struct ieee80211_sub_if_data *sdata; | |
80 | struct ieee80211_rate *rate; | |
81 | int needed_headroom = 0; | |
c49e5ea3 JB |
82 | struct ieee80211_radiotap_header *rthdr; |
83 | __le64 *rttsft = NULL; | |
84 | struct ieee80211_rtap_fixed_data { | |
b2e7771e JB |
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; | |
c49e5ea3 | 92 | } __attribute__ ((packed)) *rtfixed; |
b2e7771e JB |
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 | |
c49e5ea3 JB |
109 | /* room for radiotap header, always present fields and TSFT */ |
110 | needed_headroom = sizeof(*rthdr) + sizeof(*rtfixed) + 8; | |
b2e7771e JB |
111 | |
112 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
113 | present_fcs_len = FCS_LEN; | |
114 | ||
115 | if (!local->monitors) { | |
116 | if (should_drop_frame(status, origskb, present_fcs_len, | |
117 | rtap_len)) { | |
118 | dev_kfree_skb(origskb); | |
119 | return NULL; | |
120 | } | |
121 | ||
122 | return remove_monitor_info(local, origskb, rtap_len); | |
123 | } | |
124 | ||
125 | if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) { | |
126 | /* only need to expand headroom if necessary */ | |
127 | skb = origskb; | |
128 | origskb = NULL; | |
129 | ||
130 | /* | |
131 | * This shouldn't trigger often because most devices have an | |
132 | * RX header they pull before we get here, and that should | |
133 | * be big enough for our radiotap information. We should | |
134 | * probably export the length to drivers so that we can have | |
135 | * them allocate enough headroom to start with. | |
136 | */ | |
137 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 138 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
139 | dev_kfree_skb(skb); |
140 | return NULL; | |
141 | } | |
142 | } else { | |
143 | /* | |
144 | * Need to make a copy and possibly remove radiotap header | |
145 | * and FCS from the original. | |
146 | */ | |
147 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
148 | ||
149 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
150 | ||
151 | if (!skb) | |
152 | return origskb; | |
153 | } | |
154 | ||
155 | /* if necessary, prepend radiotap information */ | |
156 | if (!(status->flag & RX_FLAG_RADIOTAP)) { | |
c49e5ea3 JB |
157 | rtfixed = (void *) skb_push(skb, sizeof(*rtfixed)); |
158 | rtap_len = sizeof(*rthdr) + sizeof(*rtfixed); | |
159 | if (status->flag & RX_FLAG_TSFT) { | |
160 | rttsft = (void *) skb_push(skb, sizeof(*rttsft)); | |
161 | rtap_len += 8; | |
162 | } | |
b2e7771e JB |
163 | rthdr = (void *) skb_push(skb, sizeof(*rthdr)); |
164 | memset(rthdr, 0, sizeof(*rthdr)); | |
c49e5ea3 JB |
165 | memset(rtfixed, 0, sizeof(*rtfixed)); |
166 | rthdr->it_present = | |
b2e7771e JB |
167 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | |
168 | (1 << IEEE80211_RADIOTAP_RATE) | | |
169 | (1 << IEEE80211_RADIOTAP_CHANNEL) | | |
170 | (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL) | | |
171 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
c49e5ea3 JB |
172 | rtfixed->flags = 0; |
173 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
174 | rtfixed->flags |= IEEE80211_RADIOTAP_F_FCS; | |
175 | ||
176 | if (rttsft) { | |
177 | *rttsft = cpu_to_le64(status->mactime); | |
178 | rthdr->it_present |= | |
179 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
180 | } | |
b2e7771e JB |
181 | |
182 | /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */ | |
c49e5ea3 | 183 | rtfixed->rx_flags = 0; |
b2e7771e JB |
184 | if (status->flag & |
185 | (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
c49e5ea3 | 186 | rtfixed->rx_flags |= |
b2e7771e JB |
187 | cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS); |
188 | ||
189 | rate = ieee80211_get_rate(local, status->phymode, | |
190 | status->rate); | |
191 | if (rate) | |
c49e5ea3 | 192 | rtfixed->rate = rate->rate / 5; |
b2e7771e | 193 | |
c49e5ea3 | 194 | rtfixed->chan_freq = cpu_to_le16(status->freq); |
b2e7771e JB |
195 | |
196 | if (status->phymode == MODE_IEEE80211A) | |
c49e5ea3 | 197 | rtfixed->chan_flags = |
b2e7771e JB |
198 | cpu_to_le16(IEEE80211_CHAN_OFDM | |
199 | IEEE80211_CHAN_5GHZ); | |
200 | else | |
c49e5ea3 | 201 | rtfixed->chan_flags = |
b2e7771e JB |
202 | cpu_to_le16(IEEE80211_CHAN_DYN | |
203 | IEEE80211_CHAN_2GHZ); | |
204 | ||
c49e5ea3 JB |
205 | rtfixed->antsignal = status->ssi; |
206 | rthdr->it_len = cpu_to_le16(rtap_len); | |
b2e7771e JB |
207 | } |
208 | ||
209 | skb_set_mac_header(skb, 0); | |
210 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
211 | skb->pkt_type = PACKET_OTHERHOST; | |
212 | skb->protocol = htons(ETH_P_802_2); | |
213 | ||
214 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
215 | if (!netif_running(sdata->dev)) | |
216 | continue; | |
217 | ||
218 | if (sdata->type != IEEE80211_IF_TYPE_MNTR) | |
219 | continue; | |
220 | ||
221 | if (prev_dev) { | |
222 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
223 | if (skb2) { | |
224 | skb2->dev = prev_dev; | |
225 | netif_rx(skb2); | |
226 | } | |
227 | } | |
228 | ||
229 | prev_dev = sdata->dev; | |
230 | sdata->dev->stats.rx_packets++; | |
231 | sdata->dev->stats.rx_bytes += skb->len; | |
232 | } | |
233 | ||
234 | if (prev_dev) { | |
235 | skb->dev = prev_dev; | |
236 | netif_rx(skb); | |
237 | } else | |
238 | dev_kfree_skb(skb); | |
239 | ||
240 | return origskb; | |
241 | } | |
242 | ||
243 | ||
571ecf67 JB |
244 | /* pre-rx handlers |
245 | * | |
246 | * these don't have dev/sdata fields in the rx data | |
52865dfd JB |
247 | * The sta value should also not be used because it may |
248 | * be NULL even though a STA (in IBSS mode) will be added. | |
571ecf67 JB |
249 | */ |
250 | ||
6e0d114d JB |
251 | static ieee80211_txrx_result |
252 | ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx) | |
253 | { | |
254 | u8 *data = rx->skb->data; | |
255 | int tid; | |
256 | ||
257 | /* does the frame have a qos control field? */ | |
258 | if (WLAN_FC_IS_QOS_DATA(rx->fc)) { | |
259 | u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN; | |
260 | /* frame has qos control */ | |
261 | tid = qc[0] & QOS_CONTROL_TID_MASK; | |
fd4c7f2f | 262 | if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) |
64bd4b69 | 263 | rx->flags |= IEEE80211_TXRXD_RX_AMSDU; |
fd4c7f2f | 264 | else |
64bd4b69 | 265 | rx->flags &= ~IEEE80211_TXRXD_RX_AMSDU; |
6e0d114d JB |
266 | } else { |
267 | if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) { | |
268 | /* Separate TID for management frames */ | |
269 | tid = NUM_RX_DATA_QUEUES - 1; | |
270 | } else { | |
271 | /* no qos control present */ | |
272 | tid = 0; /* 802.1d - Best Effort */ | |
273 | } | |
274 | } | |
52865dfd | 275 | |
6e0d114d | 276 | I802_DEBUG_INC(rx->local->wme_rx_queue[tid]); |
52865dfd JB |
277 | /* only a debug counter, sta might not be assigned properly yet */ |
278 | if (rx->sta) | |
6e0d114d | 279 | I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]); |
6e0d114d JB |
280 | |
281 | rx->u.rx.queue = tid; | |
282 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. | |
283 | * For now, set skb->priority to 0 for other cases. */ | |
284 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
285 | ||
286 | return TXRX_CONTINUE; | |
287 | } | |
288 | ||
571ecf67 JB |
289 | static ieee80211_txrx_result |
290 | ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx) | |
291 | { | |
292 | struct ieee80211_local *local = rx->local; | |
293 | struct sk_buff *skb = rx->skb; | |
294 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
295 | u32 load = 0, hdrtime; | |
296 | struct ieee80211_rate *rate; | |
297 | struct ieee80211_hw_mode *mode = local->hw.conf.mode; | |
298 | int i; | |
299 | ||
300 | /* Estimate total channel use caused by this frame */ | |
301 | ||
302 | if (unlikely(mode->num_rates < 0)) | |
303 | return TXRX_CONTINUE; | |
304 | ||
305 | rate = &mode->rates[0]; | |
306 | for (i = 0; i < mode->num_rates; i++) { | |
307 | if (mode->rates[i].val == rx->u.rx.status->rate) { | |
308 | rate = &mode->rates[i]; | |
309 | break; | |
310 | } | |
311 | } | |
312 | ||
313 | /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values, | |
314 | * 1 usec = 1/8 * (1080 / 10) = 13.5 */ | |
315 | ||
316 | if (mode->mode == MODE_IEEE80211A || | |
571ecf67 JB |
317 | (mode->mode == MODE_IEEE80211G && |
318 | rate->flags & IEEE80211_RATE_ERP)) | |
319 | hdrtime = CHAN_UTIL_HDR_SHORT; | |
320 | else | |
321 | hdrtime = CHAN_UTIL_HDR_LONG; | |
322 | ||
323 | load = hdrtime; | |
324 | if (!is_multicast_ether_addr(hdr->addr1)) | |
325 | load += hdrtime; | |
326 | ||
327 | load += skb->len * rate->rate_inv; | |
328 | ||
329 | /* Divide channel_use by 8 to avoid wrapping around the counter */ | |
330 | load >>= CHAN_UTIL_SHIFT; | |
331 | local->channel_use_raw += load; | |
571ecf67 JB |
332 | rx->u.rx.load = load; |
333 | ||
334 | return TXRX_CONTINUE; | |
335 | } | |
336 | ||
337 | ieee80211_rx_handler ieee80211_rx_pre_handlers[] = | |
338 | { | |
339 | ieee80211_rx_h_parse_qos, | |
340 | ieee80211_rx_h_load_stats, | |
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 | ||
badffb72 | 406 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
571ecf67 JB |
407 | rx->skb->pkt_type = PACKET_OTHERHOST; |
408 | else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0) | |
409 | rx->skb->pkt_type = PACKET_HOST; | |
410 | else if (is_multicast_ether_addr(hdr->addr1)) { | |
411 | if (is_broadcast_ether_addr(hdr->addr1)) | |
412 | rx->skb->pkt_type = PACKET_BROADCAST; | |
413 | else | |
414 | rx->skb->pkt_type = PACKET_MULTICAST; | |
415 | } else | |
416 | rx->skb->pkt_type = PACKET_OTHERHOST; | |
417 | ||
418 | /* Drop disallowed frame classes based on STA auth/assoc state; | |
419 | * IEEE 802.11, Chap 5.5. | |
420 | * | |
421 | * 80211.o does filtering only based on association state, i.e., it | |
422 | * drops Class 3 frames from not associated stations. hostapd sends | |
423 | * deauth/disassoc frames when needed. In addition, hostapd is | |
424 | * responsible for filtering on both auth and assoc states. | |
425 | */ | |
426 | if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA || | |
427 | ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL && | |
428 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) && | |
429 | rx->sdata->type != IEEE80211_IF_TYPE_IBSS && | |
430 | (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) { | |
431 | if ((!(rx->fc & IEEE80211_FCTL_FROMDS) && | |
432 | !(rx->fc & IEEE80211_FCTL_TODS) && | |
433 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) | |
badffb72 | 434 | || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) { |
571ecf67 JB |
435 | /* Drop IBSS frames and frames for other hosts |
436 | * silently. */ | |
437 | return TXRX_DROP; | |
438 | } | |
439 | ||
f9d540ee | 440 | return TXRX_DROP; |
571ecf67 JB |
441 | } |
442 | ||
570bd537 JB |
443 | return TXRX_CONTINUE; |
444 | } | |
445 | ||
446 | ||
447 | static ieee80211_txrx_result | |
1990af8d | 448 | ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx) |
570bd537 JB |
449 | { |
450 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
3017b80b JB |
451 | int keyidx; |
452 | int hdrlen; | |
e2f036da | 453 | ieee80211_txrx_result result = TXRX_DROP; |
d4e46a3d | 454 | struct ieee80211_key *stakey = NULL; |
570bd537 | 455 | |
3017b80b JB |
456 | /* |
457 | * Key selection 101 | |
458 | * | |
459 | * There are three types of keys: | |
460 | * - GTK (group keys) | |
461 | * - PTK (pairwise keys) | |
462 | * - STK (station-to-station pairwise keys) | |
463 | * | |
464 | * When selecting a key, we have to distinguish between multicast | |
465 | * (including broadcast) and unicast frames, the latter can only | |
466 | * use PTKs and STKs while the former always use GTKs. Unless, of | |
467 | * course, actual WEP keys ("pre-RSNA") are used, then unicast | |
468 | * frames can also use key indizes like GTKs. Hence, if we don't | |
469 | * have a PTK/STK we check the key index for a WEP key. | |
470 | * | |
8dc06a1c JB |
471 | * Note that in a regular BSS, multicast frames are sent by the |
472 | * AP only, associated stations unicast the frame to the AP first | |
473 | * which then multicasts it on their behalf. | |
474 | * | |
3017b80b JB |
475 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
476 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
477 | * The spec seems to expect that one negotiates the same key with |
478 | * every station but there's no such requirement; VLANs could be | |
479 | * possible. | |
3017b80b JB |
480 | */ |
481 | ||
482 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) | |
483 | return TXRX_CONTINUE; | |
571ecf67 | 484 | |
3017b80b | 485 | /* |
1990af8d | 486 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
487 | * addressed to us nor a multicast frame. |
488 | */ | |
badffb72 | 489 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
3017b80b JB |
490 | return TXRX_CONTINUE; |
491 | ||
d4e46a3d JB |
492 | if (rx->sta) |
493 | stakey = rcu_dereference(rx->sta->key); | |
494 | ||
495 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { | |
496 | rx->key = stakey; | |
571ecf67 | 497 | } else { |
3017b80b JB |
498 | /* |
499 | * The device doesn't give us the IV so we won't be | |
500 | * able to look up the key. That's ok though, we | |
501 | * don't need to decrypt the frame, we just won't | |
502 | * be able to keep statistics accurate. | |
503 | * Except for key threshold notifications, should | |
504 | * we somehow allow the driver to tell us which key | |
505 | * the hardware used if this flag is set? | |
506 | */ | |
7848ba7d JB |
507 | if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) && |
508 | (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED)) | |
3017b80b JB |
509 | return TXRX_CONTINUE; |
510 | ||
511 | hdrlen = ieee80211_get_hdrlen(rx->fc); | |
512 | ||
513 | if (rx->skb->len < 8 + hdrlen) | |
514 | return TXRX_DROP; /* TODO: count this? */ | |
515 | ||
516 | /* | |
517 | * no need to call ieee80211_wep_get_keyidx, | |
518 | * it verifies a bunch of things we've done already | |
519 | */ | |
520 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
521 | ||
d4e46a3d | 522 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
523 | |
524 | /* | |
525 | * RSNA-protected unicast frames should always be sent with | |
526 | * pairwise or station-to-station keys, but for WEP we allow | |
527 | * using a key index as well. | |
528 | */ | |
8f20fc24 | 529 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
530 | !is_multicast_ether_addr(hdr->addr1)) |
531 | rx->key = NULL; | |
571ecf67 JB |
532 | } |
533 | ||
3017b80b | 534 | if (rx->key) { |
571ecf67 | 535 | rx->key->tx_rx_count++; |
011bfcc4 | 536 | /* TODO: add threshold stuff again */ |
1990af8d | 537 | } else { |
7f3ad894 | 538 | #ifdef CONFIG_MAC80211_DEBUG |
70f08765 JB |
539 | if (net_ratelimit()) |
540 | printk(KERN_DEBUG "%s: RX protected frame," | |
541 | " but have no key\n", rx->dev->name); | |
7f3ad894 | 542 | #endif /* CONFIG_MAC80211_DEBUG */ |
70f08765 JB |
543 | return TXRX_DROP; |
544 | } | |
545 | ||
1990af8d JB |
546 | /* Check for weak IVs if possible */ |
547 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
548 | ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) && | |
549 | (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) || | |
550 | !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) && | |
551 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) | |
552 | rx->sta->wep_weak_iv_count++; | |
553 | ||
70f08765 JB |
554 | switch (rx->key->conf.alg) { |
555 | case ALG_WEP: | |
e2f036da MN |
556 | result = ieee80211_crypto_wep_decrypt(rx); |
557 | break; | |
70f08765 | 558 | case ALG_TKIP: |
e2f036da MN |
559 | result = ieee80211_crypto_tkip_decrypt(rx); |
560 | break; | |
70f08765 | 561 | case ALG_CCMP: |
e2f036da MN |
562 | result = ieee80211_crypto_ccmp_decrypt(rx); |
563 | break; | |
70f08765 JB |
564 | } |
565 | ||
e2f036da MN |
566 | /* either the frame has been decrypted or will be dropped */ |
567 | rx->u.rx.status->flag |= RX_FLAG_DECRYPTED; | |
568 | ||
569 | return result; | |
70f08765 JB |
570 | } |
571 | ||
571ecf67 JB |
572 | static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta) |
573 | { | |
574 | struct ieee80211_sub_if_data *sdata; | |
0795af57 JP |
575 | DECLARE_MAC_BUF(mac); |
576 | ||
571ecf67 JB |
577 | sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); |
578 | ||
579 | if (sdata->bss) | |
580 | atomic_inc(&sdata->bss->num_sta_ps); | |
581 | sta->flags |= WLAN_STA_PS; | |
582 | sta->pspoll = 0; | |
583 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
584 | printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n", |
585 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 JB |
586 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
587 | } | |
588 | ||
589 | static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta) | |
590 | { | |
591 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
592 | struct sk_buff *skb; | |
593 | int sent = 0; | |
594 | struct ieee80211_sub_if_data *sdata; | |
595 | struct ieee80211_tx_packet_data *pkt_data; | |
0795af57 | 596 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
597 | |
598 | sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); | |
599 | if (sdata->bss) | |
600 | atomic_dec(&sdata->bss->num_sta_ps); | |
601 | sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM); | |
602 | sta->pspoll = 0; | |
603 | if (!skb_queue_empty(&sta->ps_tx_buf)) { | |
604 | if (local->ops->set_tim) | |
605 | local->ops->set_tim(local_to_hw(local), sta->aid, 0); | |
606 | if (sdata->bss) | |
607 | bss_tim_clear(local, sdata->bss, sta->aid); | |
608 | } | |
609 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
610 | printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n", |
611 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 JB |
612 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
613 | /* Send all buffered frames to the station */ | |
614 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
615 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; | |
616 | sent++; | |
e8bf9649 | 617 | pkt_data->flags |= IEEE80211_TXPD_REQUEUE; |
571ecf67 JB |
618 | dev_queue_xmit(skb); |
619 | } | |
620 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
621 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; | |
622 | local->total_ps_buffered--; | |
623 | sent++; | |
624 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 | 625 | printk(KERN_DEBUG "%s: STA %s aid %d send PS frame " |
571ecf67 | 626 | "since STA not sleeping anymore\n", dev->name, |
0795af57 | 627 | print_mac(mac, sta->addr), sta->aid); |
571ecf67 | 628 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
e8bf9649 | 629 | pkt_data->flags |= IEEE80211_TXPD_REQUEUE; |
571ecf67 JB |
630 | dev_queue_xmit(skb); |
631 | } | |
632 | ||
633 | return sent; | |
634 | } | |
635 | ||
636 | static ieee80211_txrx_result | |
637 | ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx) | |
638 | { | |
639 | struct sta_info *sta = rx->sta; | |
640 | struct net_device *dev = rx->dev; | |
641 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
642 | ||
643 | if (!sta) | |
644 | return TXRX_CONTINUE; | |
645 | ||
646 | /* Update last_rx only for IBSS packets which are for the current | |
647 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
648 | * other STAs are using different BSSID. */ | |
649 | if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) { | |
650 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len); | |
651 | if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0) | |
652 | sta->last_rx = jiffies; | |
653 | } else | |
654 | if (!is_multicast_ether_addr(hdr->addr1) || | |
655 | rx->sdata->type == IEEE80211_IF_TYPE_STA) { | |
656 | /* Update last_rx only for unicast frames in order to prevent | |
657 | * the Probe Request frames (the only broadcast frames from a | |
658 | * STA in infrastructure mode) from keeping a connection alive. | |
659 | */ | |
660 | sta->last_rx = jiffies; | |
661 | } | |
662 | ||
badffb72 | 663 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
571ecf67 JB |
664 | return TXRX_CONTINUE; |
665 | ||
666 | sta->rx_fragments++; | |
667 | sta->rx_bytes += rx->skb->len; | |
6c55aa97 LF |
668 | sta->last_rssi = rx->u.rx.status->ssi; |
669 | sta->last_signal = rx->u.rx.status->signal; | |
670 | sta->last_noise = rx->u.rx.status->noise; | |
571ecf67 JB |
671 | |
672 | if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) { | |
673 | /* Change STA power saving mode only in the end of a frame | |
674 | * exchange sequence */ | |
675 | if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM)) | |
676 | rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta); | |
677 | else if (!(sta->flags & WLAN_STA_PS) && | |
678 | (rx->fc & IEEE80211_FCTL_PM)) | |
679 | ap_sta_ps_start(dev, sta); | |
680 | } | |
681 | ||
682 | /* Drop data::nullfunc frames silently, since they are used only to | |
683 | * control station power saving mode. */ | |
684 | if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
685 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) { | |
686 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); | |
687 | /* Update counter and free packet here to avoid counting this | |
688 | * as a dropped packed. */ | |
689 | sta->rx_packets++; | |
690 | dev_kfree_skb(rx->skb); | |
691 | return TXRX_QUEUED; | |
692 | } | |
693 | ||
694 | return TXRX_CONTINUE; | |
695 | } /* ieee80211_rx_h_sta_process */ | |
696 | ||
571ecf67 JB |
697 | static inline struct ieee80211_fragment_entry * |
698 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
699 | unsigned int frag, unsigned int seq, int rx_queue, | |
700 | struct sk_buff **skb) | |
701 | { | |
702 | struct ieee80211_fragment_entry *entry; | |
703 | int idx; | |
704 | ||
705 | idx = sdata->fragment_next; | |
706 | entry = &sdata->fragments[sdata->fragment_next++]; | |
707 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
708 | sdata->fragment_next = 0; | |
709 | ||
710 | if (!skb_queue_empty(&entry->skb_list)) { | |
711 | #ifdef CONFIG_MAC80211_DEBUG | |
712 | struct ieee80211_hdr *hdr = | |
713 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
0795af57 JP |
714 | DECLARE_MAC_BUF(mac); |
715 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
716 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " |
717 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0795af57 | 718 | "addr1=%s addr2=%s\n", |
571ecf67 JB |
719 | sdata->dev->name, idx, |
720 | jiffies - entry->first_frag_time, entry->seq, | |
0795af57 JP |
721 | entry->last_frag, print_mac(mac, hdr->addr1), |
722 | print_mac(mac2, hdr->addr2)); | |
571ecf67 JB |
723 | #endif /* CONFIG_MAC80211_DEBUG */ |
724 | __skb_queue_purge(&entry->skb_list); | |
725 | } | |
726 | ||
727 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
728 | *skb = NULL; | |
729 | entry->first_frag_time = jiffies; | |
730 | entry->seq = seq; | |
731 | entry->rx_queue = rx_queue; | |
732 | entry->last_frag = frag; | |
733 | entry->ccmp = 0; | |
734 | entry->extra_len = 0; | |
735 | ||
736 | return entry; | |
737 | } | |
738 | ||
739 | static inline struct ieee80211_fragment_entry * | |
740 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
741 | u16 fc, unsigned int frag, unsigned int seq, | |
742 | int rx_queue, struct ieee80211_hdr *hdr) | |
743 | { | |
744 | struct ieee80211_fragment_entry *entry; | |
745 | int i, idx; | |
746 | ||
747 | idx = sdata->fragment_next; | |
748 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
749 | struct ieee80211_hdr *f_hdr; | |
750 | u16 f_fc; | |
751 | ||
752 | idx--; | |
753 | if (idx < 0) | |
754 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
755 | ||
756 | entry = &sdata->fragments[idx]; | |
757 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
758 | entry->rx_queue != rx_queue || | |
759 | entry->last_frag + 1 != frag) | |
760 | continue; | |
761 | ||
762 | f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data; | |
763 | f_fc = le16_to_cpu(f_hdr->frame_control); | |
764 | ||
765 | if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) || | |
766 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || | |
767 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
768 | continue; | |
769 | ||
770 | if (entry->first_frag_time + 2 * HZ < jiffies) { | |
771 | __skb_queue_purge(&entry->skb_list); | |
772 | continue; | |
773 | } | |
774 | return entry; | |
775 | } | |
776 | ||
777 | return NULL; | |
778 | } | |
779 | ||
780 | static ieee80211_txrx_result | |
781 | ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx) | |
782 | { | |
783 | struct ieee80211_hdr *hdr; | |
784 | u16 sc; | |
785 | unsigned int frag, seq; | |
786 | struct ieee80211_fragment_entry *entry; | |
787 | struct sk_buff *skb; | |
0795af57 | 788 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
789 | |
790 | hdr = (struct ieee80211_hdr *) rx->skb->data; | |
791 | sc = le16_to_cpu(hdr->seq_ctrl); | |
792 | frag = sc & IEEE80211_SCTL_FRAG; | |
793 | ||
794 | if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) || | |
795 | (rx->skb)->len < 24 || | |
796 | is_multicast_ether_addr(hdr->addr1))) { | |
797 | /* not fragmented */ | |
798 | goto out; | |
799 | } | |
800 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
801 | ||
802 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
803 | ||
804 | if (frag == 0) { | |
805 | /* This is the first fragment of a new frame. */ | |
806 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
807 | rx->u.rx.queue, &(rx->skb)); | |
8f20fc24 | 808 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
571ecf67 JB |
809 | (rx->fc & IEEE80211_FCTL_PROTECTED)) { |
810 | /* Store CCMP PN so that we can verify that the next | |
811 | * fragment has a sequential PN value. */ | |
812 | entry->ccmp = 1; | |
813 | memcpy(entry->last_pn, | |
814 | rx->key->u.ccmp.rx_pn[rx->u.rx.queue], | |
815 | CCMP_PN_LEN); | |
816 | } | |
817 | return TXRX_QUEUED; | |
818 | } | |
819 | ||
820 | /* This is a fragment for a frame that should already be pending in | |
821 | * fragment cache. Add this fragment to the end of the pending entry. | |
822 | */ | |
823 | entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq, | |
824 | rx->u.rx.queue, hdr); | |
825 | if (!entry) { | |
826 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
827 | return TXRX_DROP; | |
828 | } | |
829 | ||
830 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
831 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
832 | if (entry->ccmp) { | |
833 | int i; | |
834 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 835 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
571ecf67 JB |
836 | return TXRX_DROP; |
837 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); | |
838 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
839 | pn[i]++; | |
840 | if (pn[i]) | |
841 | break; | |
842 | } | |
843 | rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue]; | |
844 | if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) { | |
1a84f3fd JB |
845 | if (net_ratelimit()) |
846 | printk(KERN_DEBUG "%s: defrag: CCMP PN not " | |
0795af57 | 847 | "sequential A2=%s" |
1a84f3fd JB |
848 | " PN=%02x%02x%02x%02x%02x%02x " |
849 | "(expected %02x%02x%02x%02x%02x%02x)\n", | |
0795af57 | 850 | rx->dev->name, print_mac(mac, hdr->addr2), |
1a84f3fd JB |
851 | rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], |
852 | rpn[5], pn[0], pn[1], pn[2], pn[3], | |
853 | pn[4], pn[5]); | |
571ecf67 JB |
854 | return TXRX_DROP; |
855 | } | |
856 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); | |
857 | } | |
858 | ||
859 | skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc)); | |
860 | __skb_queue_tail(&entry->skb_list, rx->skb); | |
861 | entry->last_frag = frag; | |
862 | entry->extra_len += rx->skb->len; | |
863 | if (rx->fc & IEEE80211_FCTL_MOREFRAGS) { | |
864 | rx->skb = NULL; | |
865 | return TXRX_QUEUED; | |
866 | } | |
867 | ||
868 | rx->skb = __skb_dequeue(&entry->skb_list); | |
869 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
870 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
871 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
872 | GFP_ATOMIC))) { | |
873 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
874 | __skb_queue_purge(&entry->skb_list); | |
875 | return TXRX_DROP; | |
876 | } | |
877 | } | |
878 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
879 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
880 | dev_kfree_skb(skb); | |
881 | } | |
882 | ||
883 | /* Complete frame has been reassembled - process it now */ | |
badffb72 | 884 | rx->flags |= IEEE80211_TXRXD_FRAGMENTED; |
571ecf67 JB |
885 | |
886 | out: | |
887 | if (rx->sta) | |
888 | rx->sta->rx_packets++; | |
889 | if (is_multicast_ether_addr(hdr->addr1)) | |
890 | rx->local->dot11MulticastReceivedFrameCount++; | |
891 | else | |
892 | ieee80211_led_rx(rx->local); | |
893 | return TXRX_CONTINUE; | |
894 | } | |
895 | ||
896 | static ieee80211_txrx_result | |
897 | ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx) | |
898 | { | |
899 | struct sk_buff *skb; | |
900 | int no_pending_pkts; | |
0795af57 | 901 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
902 | |
903 | if (likely(!rx->sta || | |
904 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL || | |
905 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL || | |
badffb72 | 906 | !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))) |
571ecf67 JB |
907 | return TXRX_CONTINUE; |
908 | ||
909 | skb = skb_dequeue(&rx->sta->tx_filtered); | |
910 | if (!skb) { | |
911 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
912 | if (skb) | |
913 | rx->local->total_ps_buffered--; | |
914 | } | |
915 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
916 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
917 | ||
918 | if (skb) { | |
919 | struct ieee80211_hdr *hdr = | |
920 | (struct ieee80211_hdr *) skb->data; | |
921 | ||
922 | /* tell TX path to send one frame even though the STA may | |
923 | * still remain is PS mode after this frame exchange */ | |
924 | rx->sta->pspoll = 1; | |
925 | ||
926 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
927 | printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n", |
928 | print_mac(mac, rx->sta->addr), rx->sta->aid, | |
571ecf67 JB |
929 | skb_queue_len(&rx->sta->ps_tx_buf)); |
930 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
931 | ||
932 | /* Use MoreData flag to indicate whether there are more | |
933 | * buffered frames for this STA */ | |
934 | if (no_pending_pkts) { | |
935 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); | |
936 | rx->sta->flags &= ~WLAN_STA_TIM; | |
937 | } else | |
938 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
939 | ||
940 | dev_queue_xmit(skb); | |
941 | ||
942 | if (no_pending_pkts) { | |
943 | if (rx->local->ops->set_tim) | |
944 | rx->local->ops->set_tim(local_to_hw(rx->local), | |
945 | rx->sta->aid, 0); | |
946 | if (rx->sdata->bss) | |
947 | bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid); | |
948 | } | |
949 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
950 | } else if (!rx->u.rx.sent_ps_buffered) { | |
0795af57 | 951 | printk(KERN_DEBUG "%s: STA %s sent PS Poll even " |
571ecf67 | 952 | "though there is no buffered frames for it\n", |
0795af57 | 953 | rx->dev->name, print_mac(mac, rx->sta->addr)); |
571ecf67 JB |
954 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
955 | ||
956 | } | |
957 | ||
958 | /* Free PS Poll skb here instead of returning TXRX_DROP that would | |
959 | * count as an dropped frame. */ | |
960 | dev_kfree_skb(rx->skb); | |
961 | ||
962 | return TXRX_QUEUED; | |
963 | } | |
964 | ||
6e0d114d JB |
965 | static ieee80211_txrx_result |
966 | ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx) | |
967 | { | |
968 | u16 fc = rx->fc; | |
969 | u8 *data = rx->skb->data; | |
970 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data; | |
971 | ||
972 | if (!WLAN_FC_IS_QOS_DATA(fc)) | |
973 | return TXRX_CONTINUE; | |
974 | ||
975 | /* remove the qos control field, update frame type and meta-data */ | |
976 | memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2); | |
977 | hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2); | |
978 | /* change frame type to non QOS */ | |
979 | rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA; | |
980 | hdr->frame_control = cpu_to_le16(fc); | |
981 | ||
982 | return TXRX_CONTINUE; | |
983 | } | |
984 | ||
76ee65bf RR |
985 | static int |
986 | ieee80211_drop_802_1x_pae(struct ieee80211_txrx_data *rx, int hdrlen) | |
571ecf67 | 987 | { |
76ee65bf | 988 | if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb, hdrlen) && |
badffb72 | 989 | rx->sdata->type != IEEE80211_IF_TYPE_STA && |
f9d540ee | 990 | (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
76ee65bf | 991 | return 0; |
571ecf67 JB |
992 | |
993 | if (unlikely(rx->sdata->ieee802_1x && | |
994 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
995 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC && | |
996 | (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) && | |
76ee65bf | 997 | !ieee80211_is_eapol(rx->skb, hdrlen))) { |
571ecf67 | 998 | #ifdef CONFIG_MAC80211_DEBUG |
76ee65bf RR |
999 | printk(KERN_DEBUG "%s: dropped frame " |
1000 | "(unauthorized port)\n", rx->dev->name); | |
571ecf67 | 1001 | #endif /* CONFIG_MAC80211_DEBUG */ |
76ee65bf | 1002 | return -EACCES; |
571ecf67 JB |
1003 | } |
1004 | ||
76ee65bf | 1005 | return 0; |
571ecf67 JB |
1006 | } |
1007 | ||
76ee65bf RR |
1008 | static int |
1009 | ieee80211_drop_unencrypted(struct ieee80211_txrx_data *rx, int hdrlen) | |
571ecf67 | 1010 | { |
3017b80b | 1011 | /* |
7848ba7d JB |
1012 | * Pass through unencrypted frames if the hardware has |
1013 | * decrypted them already. | |
3017b80b | 1014 | */ |
7848ba7d | 1015 | if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1016 | return 0; |
571ecf67 JB |
1017 | |
1018 | /* Drop unencrypted frames if key is set. */ | |
1019 | if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) && | |
1020 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
1021 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC && | |
8312512e | 1022 | (rx->key || rx->sdata->drop_unencrypted) && |
76ee65bf RR |
1023 | (rx->sdata->eapol == 0 || |
1024 | !ieee80211_is_eapol(rx->skb, hdrlen)))) { | |
1a84f3fd JB |
1025 | if (net_ratelimit()) |
1026 | printk(KERN_DEBUG "%s: RX non-WEP frame, but expected " | |
1027 | "encryption\n", rx->dev->name); | |
76ee65bf | 1028 | return -EACCES; |
571ecf67 | 1029 | } |
76ee65bf | 1030 | return 0; |
571ecf67 JB |
1031 | } |
1032 | ||
76ee65bf RR |
1033 | static int |
1034 | ieee80211_data_to_8023(struct ieee80211_txrx_data *rx) | |
571ecf67 JB |
1035 | { |
1036 | struct net_device *dev = rx->dev; | |
571ecf67 JB |
1037 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; |
1038 | u16 fc, hdrlen, ethertype; | |
1039 | u8 *payload; | |
1040 | u8 dst[ETH_ALEN]; | |
1041 | u8 src[ETH_ALEN]; | |
76ee65bf | 1042 | struct sk_buff *skb = rx->skb; |
571ecf67 | 1043 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
0795af57 JP |
1044 | DECLARE_MAC_BUF(mac); |
1045 | DECLARE_MAC_BUF(mac2); | |
1046 | DECLARE_MAC_BUF(mac3); | |
1047 | DECLARE_MAC_BUF(mac4); | |
571ecf67 JB |
1048 | |
1049 | fc = rx->fc; | |
571ecf67 JB |
1050 | |
1051 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
76ee65bf | 1052 | return -1; |
571ecf67 JB |
1053 | |
1054 | hdrlen = ieee80211_get_hdrlen(fc); | |
1055 | ||
1056 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
1057 | * header | |
1058 | * IEEE 802.11 address fields: | |
1059 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
1060 | * 0 0 DA SA BSSID n/a | |
1061 | * 0 1 DA BSSID SA n/a | |
1062 | * 1 0 BSSID SA DA n/a | |
1063 | * 1 1 RA TA DA SA | |
1064 | */ | |
1065 | ||
1066 | switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
1067 | case IEEE80211_FCTL_TODS: | |
1068 | /* BSSID SA DA */ | |
1069 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1070 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1071 | ||
1072 | if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP && | |
1073 | sdata->type != IEEE80211_IF_TYPE_VLAN)) { | |
1a84f3fd JB |
1074 | if (net_ratelimit()) |
1075 | printk(KERN_DEBUG "%s: dropped ToDS frame " | |
0795af57 | 1076 | "(BSSID=%s SA=%s DA=%s)\n", |
1a84f3fd | 1077 | dev->name, |
0795af57 JP |
1078 | print_mac(mac, hdr->addr1), |
1079 | print_mac(mac2, hdr->addr2), | |
1080 | print_mac(mac3, hdr->addr3)); | |
76ee65bf | 1081 | return -1; |
571ecf67 JB |
1082 | } |
1083 | break; | |
1084 | case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
1085 | /* RA TA DA SA */ | |
1086 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1087 | memcpy(src, hdr->addr4, ETH_ALEN); | |
1088 | ||
1089 | if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) { | |
1a84f3fd JB |
1090 | if (net_ratelimit()) |
1091 | printk(KERN_DEBUG "%s: dropped FromDS&ToDS " | |
0795af57 | 1092 | "frame (RA=%s TA=%s DA=%s SA=%s)\n", |
1a84f3fd | 1093 | rx->dev->name, |
0795af57 JP |
1094 | print_mac(mac, hdr->addr1), |
1095 | print_mac(mac2, hdr->addr2), | |
1096 | print_mac(mac3, hdr->addr3), | |
1097 | print_mac(mac4, hdr->addr4)); | |
76ee65bf | 1098 | return -1; |
571ecf67 JB |
1099 | } |
1100 | break; | |
1101 | case IEEE80211_FCTL_FROMDS: | |
1102 | /* DA BSSID SA */ | |
1103 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1104 | memcpy(src, hdr->addr3, ETH_ALEN); | |
1105 | ||
b3316157 JL |
1106 | if (sdata->type != IEEE80211_IF_TYPE_STA || |
1107 | (is_multicast_ether_addr(dst) && | |
1108 | !compare_ether_addr(src, dev->dev_addr))) | |
76ee65bf | 1109 | return -1; |
571ecf67 JB |
1110 | break; |
1111 | case 0: | |
1112 | /* DA SA BSSID */ | |
1113 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1114 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1115 | ||
1116 | if (sdata->type != IEEE80211_IF_TYPE_IBSS) { | |
1117 | if (net_ratelimit()) { | |
0795af57 JP |
1118 | printk(KERN_DEBUG "%s: dropped IBSS frame " |
1119 | "(DA=%s SA=%s BSSID=%s)\n", | |
1120 | dev->name, | |
1121 | print_mac(mac, hdr->addr1), | |
1122 | print_mac(mac2, hdr->addr2), | |
1123 | print_mac(mac3, hdr->addr3)); | |
571ecf67 | 1124 | } |
76ee65bf | 1125 | return -1; |
571ecf67 JB |
1126 | } |
1127 | break; | |
1128 | } | |
1129 | ||
571ecf67 JB |
1130 | if (unlikely(skb->len - hdrlen < 8)) { |
1131 | if (net_ratelimit()) { | |
1132 | printk(KERN_DEBUG "%s: RX too short data frame " | |
1133 | "payload\n", dev->name); | |
1134 | } | |
76ee65bf | 1135 | return -1; |
571ecf67 JB |
1136 | } |
1137 | ||
76ee65bf | 1138 | payload = skb->data + hdrlen; |
571ecf67 JB |
1139 | ethertype = (payload[6] << 8) | payload[7]; |
1140 | ||
1141 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1142 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1143 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1144 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1145 | * replace EtherType */ | |
1146 | skb_pull(skb, hdrlen + 6); | |
1147 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1148 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1149 | } else { | |
1150 | struct ethhdr *ehdr; | |
1151 | __be16 len; | |
1152 | skb_pull(skb, hdrlen); | |
1153 | len = htons(skb->len); | |
1154 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1155 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1156 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1157 | ehdr->h_proto = len; | |
1158 | } | |
76ee65bf RR |
1159 | return 0; |
1160 | } | |
571ecf67 | 1161 | |
76ee65bf RR |
1162 | static void |
1163 | ieee80211_deliver_skb(struct ieee80211_txrx_data *rx) | |
1164 | { | |
1165 | struct net_device *dev = rx->dev; | |
1166 | struct ieee80211_local *local = rx->local; | |
1167 | struct sk_buff *skb, *xmit_skb; | |
1168 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
571ecf67 | 1169 | |
76ee65bf RR |
1170 | skb = rx->skb; |
1171 | xmit_skb = NULL; | |
571ecf67 JB |
1172 | |
1173 | if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP | |
badffb72 JS |
1174 | || sdata->type == IEEE80211_IF_TYPE_VLAN) && |
1175 | (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) { | |
571ecf67 JB |
1176 | if (is_multicast_ether_addr(skb->data)) { |
1177 | /* send multicast frames both to higher layers in | |
1178 | * local net stack and back to the wireless media */ | |
76ee65bf RR |
1179 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1180 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1181 | printk(KERN_DEBUG "%s: failed to clone " |
1182 | "multicast frame\n", dev->name); | |
1183 | } else { | |
1184 | struct sta_info *dsta; | |
1185 | dsta = sta_info_get(local, skb->data); | |
1186 | if (dsta && !dsta->dev) { | |
1a84f3fd JB |
1187 | if (net_ratelimit()) |
1188 | printk(KERN_DEBUG "Station with null " | |
1189 | "dev structure!\n"); | |
571ecf67 JB |
1190 | } else if (dsta && dsta->dev == dev) { |
1191 | /* Destination station is associated to this | |
1192 | * AP, so send the frame directly to it and | |
1193 | * do not pass the frame to local net stack. | |
1194 | */ | |
76ee65bf | 1195 | xmit_skb = skb; |
571ecf67 JB |
1196 | skb = NULL; |
1197 | } | |
1198 | if (dsta) | |
1199 | sta_info_put(dsta); | |
1200 | } | |
1201 | } | |
1202 | ||
1203 | if (skb) { | |
1204 | /* deliver to local stack */ | |
1205 | skb->protocol = eth_type_trans(skb, dev); | |
1206 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1207 | netif_rx(skb); | |
1208 | } | |
1209 | ||
76ee65bf | 1210 | if (xmit_skb) { |
571ecf67 | 1211 | /* send to wireless media */ |
f831e909 | 1212 | xmit_skb->protocol = htons(ETH_P_802_3); |
76ee65bf RR |
1213 | skb_set_network_header(xmit_skb, 0); |
1214 | skb_set_mac_header(xmit_skb, 0); | |
1215 | dev_queue_xmit(xmit_skb); | |
571ecf67 | 1216 | } |
76ee65bf RR |
1217 | } |
1218 | ||
fd4c7f2f RR |
1219 | static ieee80211_txrx_result |
1220 | ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx) | |
1221 | { | |
1222 | struct net_device *dev = rx->dev; | |
1223 | struct ieee80211_local *local = rx->local; | |
1224 | u16 fc, ethertype; | |
1225 | u8 *payload; | |
1226 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
1227 | const struct ethhdr *eth; | |
1228 | int remaining, err; | |
1229 | u8 dst[ETH_ALEN]; | |
1230 | u8 src[ETH_ALEN]; | |
1231 | DECLARE_MAC_BUF(mac); | |
1232 | ||
1233 | fc = rx->fc; | |
1234 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
1235 | return TXRX_CONTINUE; | |
1236 | ||
1237 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
1238 | return TXRX_DROP; | |
1239 | ||
64bd4b69 | 1240 | if (!(rx->flags & IEEE80211_TXRXD_RX_AMSDU)) |
fd4c7f2f RR |
1241 | return TXRX_CONTINUE; |
1242 | ||
1243 | err = ieee80211_data_to_8023(rx); | |
1244 | if (unlikely(err)) | |
1245 | return TXRX_DROP; | |
1246 | ||
1247 | skb->dev = dev; | |
1248 | ||
1249 | dev->stats.rx_packets++; | |
1250 | dev->stats.rx_bytes += skb->len; | |
1251 | ||
1252 | /* skip the wrapping header */ | |
1253 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1254 | if (!eth) | |
1255 | return TXRX_DROP; | |
1256 | ||
1257 | while (skb != frame) { | |
1258 | u8 padding; | |
1259 | __be16 len = eth->h_proto; | |
1260 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1261 | ||
1262 | remaining = skb->len; | |
1263 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1264 | memcpy(src, eth->h_source, ETH_ALEN); | |
1265 | ||
1266 | padding = ((4 - subframe_len) & 0x3); | |
1267 | /* the last MSDU has no padding */ | |
1268 | if (subframe_len > remaining) { | |
1269 | printk(KERN_DEBUG "%s: wrong buffer size", dev->name); | |
1270 | return TXRX_DROP; | |
1271 | } | |
1272 | ||
1273 | skb_pull(skb, sizeof(struct ethhdr)); | |
1274 | /* if last subframe reuse skb */ | |
1275 | if (remaining <= subframe_len + padding) | |
1276 | frame = skb; | |
1277 | else { | |
1278 | frame = dev_alloc_skb(local->hw.extra_tx_headroom + | |
1279 | subframe_len); | |
1280 | ||
1281 | if (frame == NULL) | |
1282 | return TXRX_DROP; | |
1283 | ||
1284 | skb_reserve(frame, local->hw.extra_tx_headroom + | |
1285 | sizeof(struct ethhdr)); | |
1286 | memcpy(skb_put(frame, ntohs(len)), skb->data, | |
1287 | ntohs(len)); | |
1288 | ||
1289 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1290 | padding); | |
1291 | if (!eth) { | |
1292 | printk(KERN_DEBUG "%s: wrong buffer size ", | |
1293 | dev->name); | |
1294 | dev_kfree_skb(frame); | |
1295 | return TXRX_DROP; | |
1296 | } | |
1297 | } | |
1298 | ||
1299 | skb_set_network_header(frame, 0); | |
1300 | frame->dev = dev; | |
1301 | frame->priority = skb->priority; | |
1302 | rx->skb = frame; | |
1303 | ||
1304 | if ((ieee80211_drop_802_1x_pae(rx, 0)) || | |
1305 | (ieee80211_drop_unencrypted(rx, 0))) { | |
1306 | if (skb == frame) /* last frame */ | |
1307 | return TXRX_DROP; | |
1308 | dev_kfree_skb(frame); | |
1309 | continue; | |
1310 | } | |
1311 | ||
1312 | payload = frame->data; | |
1313 | ethertype = (payload[6] << 8) | payload[7]; | |
1314 | ||
1315 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1316 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1317 | compare_ether_addr(payload, | |
1318 | bridge_tunnel_header) == 0)) { | |
1319 | /* remove RFC1042 or Bridge-Tunnel | |
1320 | * encapsulation and replace EtherType */ | |
1321 | skb_pull(frame, 6); | |
1322 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1323 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1324 | } else { | |
1325 | memcpy(skb_push(frame, sizeof(__be16)), &len, | |
1326 | sizeof(__be16)); | |
1327 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1328 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1329 | } | |
1330 | ||
1331 | ||
1332 | ieee80211_deliver_skb(rx); | |
1333 | } | |
1334 | ||
1335 | return TXRX_QUEUED; | |
1336 | } | |
1337 | ||
76ee65bf RR |
1338 | static ieee80211_txrx_result |
1339 | ieee80211_rx_h_data(struct ieee80211_txrx_data *rx) | |
1340 | { | |
1341 | struct net_device *dev = rx->dev; | |
1342 | u16 fc; | |
1343 | int err, hdrlen; | |
1344 | ||
1345 | fc = rx->fc; | |
1346 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
1347 | return TXRX_CONTINUE; | |
1348 | ||
1349 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
1350 | return TXRX_DROP; | |
1351 | ||
1352 | hdrlen = ieee80211_get_hdrlen(fc); | |
1353 | ||
1354 | if ((ieee80211_drop_802_1x_pae(rx, hdrlen)) || | |
1355 | (ieee80211_drop_unencrypted(rx, hdrlen))) | |
1356 | return TXRX_DROP; | |
1357 | ||
1358 | err = ieee80211_data_to_8023(rx); | |
1359 | if (unlikely(err)) | |
1360 | return TXRX_DROP; | |
1361 | ||
1362 | rx->skb->dev = dev; | |
1363 | ||
1364 | dev->stats.rx_packets++; | |
1365 | dev->stats.rx_bytes += rx->skb->len; | |
1366 | ||
1367 | ieee80211_deliver_skb(rx); | |
571ecf67 JB |
1368 | |
1369 | return TXRX_QUEUED; | |
1370 | } | |
1371 | ||
1372 | static ieee80211_txrx_result | |
1373 | ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx) | |
1374 | { | |
1375 | struct ieee80211_sub_if_data *sdata; | |
1376 | ||
badffb72 | 1377 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
571ecf67 JB |
1378 | return TXRX_DROP; |
1379 | ||
1380 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1381 | if ((sdata->type == IEEE80211_IF_TYPE_STA || | |
1382 | sdata->type == IEEE80211_IF_TYPE_IBSS) && | |
ddd3d2be | 1383 | !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)) |
571ecf67 | 1384 | ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status); |
f9d540ee JB |
1385 | else |
1386 | return TXRX_DROP; | |
1387 | ||
571ecf67 JB |
1388 | return TXRX_QUEUED; |
1389 | } | |
1390 | ||
1391 | static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers( | |
1392 | struct ieee80211_local *local, | |
1393 | ieee80211_rx_handler *handlers, | |
1394 | struct ieee80211_txrx_data *rx, | |
1395 | struct sta_info *sta) | |
1396 | { | |
1397 | ieee80211_rx_handler *handler; | |
1398 | ieee80211_txrx_result res = TXRX_DROP; | |
1399 | ||
1400 | for (handler = handlers; *handler != NULL; handler++) { | |
1401 | res = (*handler)(rx); | |
8e6f0032 JB |
1402 | |
1403 | switch (res) { | |
1404 | case TXRX_CONTINUE: | |
1405 | continue; | |
1406 | case TXRX_DROP: | |
1407 | I802_DEBUG_INC(local->rx_handlers_drop); | |
1408 | if (sta) | |
1409 | sta->rx_dropped++; | |
1410 | break; | |
1411 | case TXRX_QUEUED: | |
1412 | I802_DEBUG_INC(local->rx_handlers_queued); | |
571ecf67 JB |
1413 | break; |
1414 | } | |
8e6f0032 | 1415 | break; |
571ecf67 JB |
1416 | } |
1417 | ||
8e6f0032 | 1418 | if (res == TXRX_DROP) |
571ecf67 | 1419 | dev_kfree_skb(rx->skb); |
571ecf67 JB |
1420 | return res; |
1421 | } | |
1422 | ||
1423 | static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local, | |
1424 | ieee80211_rx_handler *handlers, | |
1425 | struct ieee80211_txrx_data *rx, | |
1426 | struct sta_info *sta) | |
1427 | { | |
1428 | if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) == | |
1429 | TXRX_CONTINUE) | |
1430 | dev_kfree_skb(rx->skb); | |
1431 | } | |
1432 | ||
1433 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, | |
1434 | struct ieee80211_hdr *hdr, | |
1435 | struct sta_info *sta, | |
1436 | struct ieee80211_txrx_data *rx) | |
1437 | { | |
1438 | int keyidx, hdrlen; | |
0795af57 JP |
1439 | DECLARE_MAC_BUF(mac); |
1440 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
1441 | |
1442 | hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb); | |
1443 | if (rx->skb->len >= hdrlen + 4) | |
1444 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1445 | else | |
1446 | keyidx = -1; | |
1447 | ||
1a84f3fd JB |
1448 | if (net_ratelimit()) |
1449 | printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC " | |
0795af57 JP |
1450 | "failure from %s to %s keyidx=%d\n", |
1451 | dev->name, print_mac(mac, hdr->addr2), | |
1452 | print_mac(mac2, hdr->addr1), keyidx); | |
571ecf67 JB |
1453 | |
1454 | if (!sta) { | |
aa0daf0e JB |
1455 | /* |
1456 | * Some hardware seem to generate incorrect Michael MIC | |
1457 | * reports; ignore them to avoid triggering countermeasures. | |
1458 | */ | |
1a84f3fd JB |
1459 | if (net_ratelimit()) |
1460 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
0795af57 JP |
1461 | "error for unknown address %s\n", |
1462 | dev->name, print_mac(mac, hdr->addr2)); | |
571ecf67 JB |
1463 | goto ignore; |
1464 | } | |
1465 | ||
1466 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) { | |
1a84f3fd JB |
1467 | if (net_ratelimit()) |
1468 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
aa0daf0e | 1469 | "error for a frame with no PROTECTED flag (src " |
0795af57 | 1470 | "%s)\n", dev->name, print_mac(mac, hdr->addr2)); |
571ecf67 JB |
1471 | goto ignore; |
1472 | } | |
1473 | ||
7848ba7d | 1474 | if (rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) { |
aa0daf0e JB |
1475 | /* |
1476 | * APs with pairwise keys should never receive Michael MIC | |
1477 | * errors for non-zero keyidx because these are reserved for | |
1478 | * group keys and only the AP is sending real multicast | |
1479 | * frames in the BSS. | |
1480 | */ | |
eb063c17 JB |
1481 | if (net_ratelimit()) |
1482 | printk(KERN_DEBUG "%s: ignored Michael MIC error for " | |
1483 | "a frame with non-zero keyidx (%d)" | |
0795af57 JP |
1484 | " (src %s)\n", dev->name, keyidx, |
1485 | print_mac(mac, hdr->addr2)); | |
eb063c17 | 1486 | goto ignore; |
571ecf67 JB |
1487 | } |
1488 | ||
1489 | if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA && | |
1490 | ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || | |
1491 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) { | |
1a84f3fd JB |
1492 | if (net_ratelimit()) |
1493 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
1494 | "error for a frame that cannot be encrypted " | |
0795af57 JP |
1495 | "(fc=0x%04x) (src %s)\n", |
1496 | dev->name, rx->fc, print_mac(mac, hdr->addr2)); | |
571ecf67 JB |
1497 | goto ignore; |
1498 | } | |
1499 | ||
eb063c17 | 1500 | mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr); |
571ecf67 JB |
1501 | ignore: |
1502 | dev_kfree_skb(rx->skb); | |
1503 | rx->skb = NULL; | |
1504 | } | |
1505 | ||
1506 | ieee80211_rx_handler ieee80211_rx_handlers[] = | |
1507 | { | |
1508 | ieee80211_rx_h_if_stats, | |
571ecf67 JB |
1509 | ieee80211_rx_h_passive_scan, |
1510 | ieee80211_rx_h_check, | |
4f0d18e2 | 1511 | ieee80211_rx_h_decrypt, |
70f08765 | 1512 | ieee80211_rx_h_sta_process, |
571ecf67 JB |
1513 | ieee80211_rx_h_defragment, |
1514 | ieee80211_rx_h_ps_poll, | |
1515 | ieee80211_rx_h_michael_mic_verify, | |
1516 | /* this must be after decryption - so header is counted in MPDU mic | |
1517 | * must be before pae and data, so QOS_DATA format frames | |
1518 | * are not passed to user space by these functions | |
1519 | */ | |
1520 | ieee80211_rx_h_remove_qos_control, | |
fd4c7f2f | 1521 | ieee80211_rx_h_amsdu, |
571ecf67 JB |
1522 | ieee80211_rx_h_data, |
1523 | ieee80211_rx_h_mgmt, | |
1524 | NULL | |
1525 | }; | |
1526 | ||
1527 | /* main receive path */ | |
1528 | ||
23a24def JB |
1529 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
1530 | u8 *bssid, struct ieee80211_txrx_data *rx, | |
1531 | struct ieee80211_hdr *hdr) | |
1532 | { | |
1533 | int multicast = is_multicast_ether_addr(hdr->addr1); | |
1534 | ||
1535 | switch (sdata->type) { | |
1536 | case IEEE80211_IF_TYPE_STA: | |
1537 | if (!bssid) | |
1538 | return 0; | |
1539 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
badffb72 | 1540 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1541 | return 0; |
badffb72 | 1542 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1543 | } else if (!multicast && |
1544 | compare_ether_addr(sdata->dev->dev_addr, | |
1545 | hdr->addr1) != 0) { | |
4150c572 | 1546 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1547 | return 0; |
badffb72 | 1548 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1549 | } |
1550 | break; | |
1551 | case IEEE80211_IF_TYPE_IBSS: | |
1552 | if (!bssid) | |
1553 | return 0; | |
1554 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
badffb72 | 1555 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1556 | return 0; |
badffb72 | 1557 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1558 | } else if (!multicast && |
1559 | compare_ether_addr(sdata->dev->dev_addr, | |
1560 | hdr->addr1) != 0) { | |
4150c572 | 1561 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1562 | return 0; |
badffb72 | 1563 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1564 | } else if (!rx->sta) |
1565 | rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb, | |
1566 | bssid, hdr->addr2); | |
1567 | break; | |
fb1c1cd6 | 1568 | case IEEE80211_IF_TYPE_VLAN: |
23a24def JB |
1569 | case IEEE80211_IF_TYPE_AP: |
1570 | if (!bssid) { | |
1571 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1572 | hdr->addr1)) | |
1573 | return 0; | |
1574 | } else if (!ieee80211_bssid_match(bssid, | |
1575 | sdata->dev->dev_addr)) { | |
badffb72 | 1576 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1577 | return 0; |
badffb72 | 1578 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def | 1579 | } |
badffb72 JS |
1580 | if (sdata->dev == sdata->local->mdev && |
1581 | !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) | |
23a24def JB |
1582 | /* do not receive anything via |
1583 | * master device when not scanning */ | |
1584 | return 0; | |
1585 | break; | |
1586 | case IEEE80211_IF_TYPE_WDS: | |
1587 | if (bssid || | |
1588 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) | |
1589 | return 0; | |
1590 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
1591 | return 0; | |
1592 | break; | |
fb1c1cd6 JB |
1593 | case IEEE80211_IF_TYPE_MNTR: |
1594 | /* take everything */ | |
1595 | break; | |
a2897552 | 1596 | case IEEE80211_IF_TYPE_INVALID: |
fb1c1cd6 JB |
1597 | /* should never get here */ |
1598 | WARN_ON(1); | |
1599 | break; | |
23a24def JB |
1600 | } |
1601 | ||
1602 | return 1; | |
1603 | } | |
1604 | ||
571ecf67 JB |
1605 | /* |
1606 | * This is the receive path handler. It is called by a low level driver when an | |
1607 | * 802.11 MPDU is received from the hardware. | |
1608 | */ | |
1609 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
1610 | struct ieee80211_rx_status *status) | |
1611 | { | |
1612 | struct ieee80211_local *local = hw_to_local(hw); | |
1613 | struct ieee80211_sub_if_data *sdata; | |
1614 | struct sta_info *sta; | |
1615 | struct ieee80211_hdr *hdr; | |
1616 | struct ieee80211_txrx_data rx; | |
1617 | u16 type; | |
b2e7771e | 1618 | int prepres; |
8e6f0032 JB |
1619 | struct ieee80211_sub_if_data *prev = NULL; |
1620 | struct sk_buff *skb_new; | |
1621 | u8 *bssid; | |
d10f2150 | 1622 | int hdrlen; |
571ecf67 | 1623 | |
d4e46a3d | 1624 | /* |
79010420 JB |
1625 | * key references and virtual interfaces are protected using RCU |
1626 | * and this requires that we are in a read-side RCU section during | |
1627 | * receive processing | |
d4e46a3d JB |
1628 | */ |
1629 | rcu_read_lock(); | |
1630 | ||
b2e7771e JB |
1631 | /* |
1632 | * Frames with failed FCS/PLCP checksum are not returned, | |
1633 | * all other frames are returned without radiotap header | |
1634 | * if it was previously present. | |
1635 | * Also, frames with less than 16 bytes are dropped. | |
1636 | */ | |
1637 | skb = ieee80211_rx_monitor(local, skb, status); | |
1638 | if (!skb) { | |
1639 | rcu_read_unlock(); | |
1640 | return; | |
1641 | } | |
1642 | ||
571ecf67 JB |
1643 | hdr = (struct ieee80211_hdr *) skb->data; |
1644 | memset(&rx, 0, sizeof(rx)); | |
1645 | rx.skb = skb; | |
1646 | rx.local = local; | |
1647 | ||
1648 | rx.u.rx.status = status; | |
b2e7771e | 1649 | rx.fc = le16_to_cpu(hdr->frame_control); |
571ecf67 | 1650 | type = rx.fc & IEEE80211_FCTL_FTYPE; |
72abd81b | 1651 | |
d10f2150 DM |
1652 | /* |
1653 | * Drivers are required to align the payload data to a four-byte | |
1654 | * boundary, so the last two bits of the address where it starts | |
1655 | * may not be set. The header is required to be directly before | |
1656 | * the payload data, padding like atheros hardware adds which is | |
1657 | * inbetween the 802.11 header and the payload is not supported, | |
1658 | * the driver is required to move the 802.11 header further back | |
1659 | * in that case. | |
1660 | */ | |
1661 | hdrlen = ieee80211_get_hdrlen(rx.fc); | |
1662 | WARN_ON_ONCE(((unsigned long)(skb->data + hdrlen)) & 3); | |
1663 | ||
b2e7771e | 1664 | if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT) |
571ecf67 | 1665 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 1666 | |
b2e7771e JB |
1667 | sta = rx.sta = sta_info_get(local, hdr->addr2); |
1668 | if (sta) { | |
1669 | rx.dev = rx.sta->dev; | |
1670 | rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev); | |
1671 | } | |
571ecf67 | 1672 | |
571ecf67 JB |
1673 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
1674 | ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx); | |
1675 | goto end; | |
1676 | } | |
1677 | ||
ece8eddd | 1678 | if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning)) |
badffb72 | 1679 | rx.flags |= IEEE80211_TXRXD_RXIN_SCAN; |
571ecf67 JB |
1680 | |
1681 | if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx, | |
1682 | sta) != TXRX_CONTINUE) | |
1683 | goto end; | |
1684 | skb = rx.skb; | |
1685 | ||
c9ee23df | 1686 | if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) && |
53918994 JB |
1687 | !atomic_read(&local->iff_promiscs) && |
1688 | !is_multicast_ether_addr(hdr->addr1)) { | |
badffb72 | 1689 | rx.flags |= IEEE80211_TXRXD_RXRA_MATCH; |
571ecf67 | 1690 | ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx, |
23a24def | 1691 | rx.sta); |
8e6f0032 | 1692 | sta_info_put(sta); |
d4e46a3d | 1693 | rcu_read_unlock(); |
8e6f0032 JB |
1694 | return; |
1695 | } | |
1696 | ||
b2e7771e | 1697 | bssid = ieee80211_get_bssid(hdr, skb->len); |
8e6f0032 | 1698 | |
79010420 | 1699 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
1700 | if (!netif_running(sdata->dev)) |
1701 | continue; | |
1702 | ||
b2e7771e JB |
1703 | if (sdata->type == IEEE80211_IF_TYPE_MNTR) |
1704 | continue; | |
1705 | ||
1706 | rx.flags |= IEEE80211_TXRXD_RXRA_MATCH; | |
23a24def JB |
1707 | prepres = prepare_for_handlers(sdata, bssid, &rx, hdr); |
1708 | /* prepare_for_handlers can change sta */ | |
1709 | sta = rx.sta; | |
1710 | ||
1711 | if (!prepres) | |
1712 | continue; | |
8e6f0032 | 1713 | |
340e11f3 JB |
1714 | /* |
1715 | * frame is destined for this interface, but if it's not | |
1716 | * also for the previous one we handle that after the | |
1717 | * loop to avoid copying the SKB once too much | |
1718 | */ | |
1719 | ||
1720 | if (!prev) { | |
1721 | prev = sdata; | |
1722 | continue; | |
8e6f0032 | 1723 | } |
340e11f3 JB |
1724 | |
1725 | /* | |
1726 | * frame was destined for the previous interface | |
1727 | * so invoke RX handlers for it | |
1728 | */ | |
1729 | ||
1730 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
1731 | if (!skb_new) { | |
1732 | if (net_ratelimit()) | |
1733 | printk(KERN_DEBUG "%s: failed to copy " | |
1734 | "multicast frame for %s", | |
dd1cd4c6 JB |
1735 | wiphy_name(local->hw.wiphy), |
1736 | prev->dev->name); | |
340e11f3 JB |
1737 | continue; |
1738 | } | |
1739 | rx.skb = skb_new; | |
1740 | rx.dev = prev->dev; | |
1741 | rx.sdata = prev; | |
1742 | ieee80211_invoke_rx_handlers(local, local->rx_handlers, | |
1743 | &rx, sta); | |
8e6f0032 | 1744 | prev = sdata; |
571ecf67 | 1745 | } |
8e6f0032 JB |
1746 | if (prev) { |
1747 | rx.skb = skb; | |
1748 | rx.dev = prev->dev; | |
1749 | rx.sdata = prev; | |
1750 | ieee80211_invoke_rx_handlers(local, local->rx_handlers, | |
1751 | &rx, sta); | |
1752 | } else | |
1753 | dev_kfree_skb(skb); | |
571ecf67 | 1754 | |
8e6f0032 | 1755 | end: |
d4e46a3d JB |
1756 | rcu_read_unlock(); |
1757 | ||
571ecf67 JB |
1758 | if (sta) |
1759 | sta_info_put(sta); | |
1760 | } | |
1761 | EXPORT_SYMBOL(__ieee80211_rx); | |
1762 | ||
1763 | /* This is a version of the rx handler that can be called from hard irq | |
1764 | * context. Post the skb on the queue and schedule the tasklet */ | |
1765 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
1766 | struct ieee80211_rx_status *status) | |
1767 | { | |
1768 | struct ieee80211_local *local = hw_to_local(hw); | |
1769 | ||
1770 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
1771 | ||
1772 | skb->dev = local->mdev; | |
1773 | /* copy status into skb->cb for use by tasklet */ | |
1774 | memcpy(skb->cb, status, sizeof(*status)); | |
1775 | skb->pkt_type = IEEE80211_RX_MSG; | |
1776 | skb_queue_tail(&local->skb_queue, skb); | |
1777 | tasklet_schedule(&local->tasklet); | |
1778 | } | |
1779 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |