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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> | |
16 | #include <net/iw_handler.h> | |
17 | #include <net/mac80211.h> | |
18 | #include <net/ieee80211_radiotap.h> | |
19 | ||
20 | #include "ieee80211_i.h" | |
21 | #include "ieee80211_led.h" | |
22 | #include "ieee80211_common.h" | |
23 | #include "wep.h" | |
24 | #include "wpa.h" | |
25 | #include "tkip.h" | |
26 | #include "wme.h" | |
27 | ||
28 | /* pre-rx handlers | |
29 | * | |
30 | * these don't have dev/sdata fields in the rx data | |
31 | */ | |
32 | ||
33 | static ieee80211_txrx_result | |
34 | ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx) | |
35 | { | |
36 | struct ieee80211_local *local = rx->local; | |
37 | struct sk_buff *skb = rx->skb; | |
38 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
39 | u32 load = 0, hdrtime; | |
40 | struct ieee80211_rate *rate; | |
41 | struct ieee80211_hw_mode *mode = local->hw.conf.mode; | |
42 | int i; | |
43 | ||
44 | /* Estimate total channel use caused by this frame */ | |
45 | ||
46 | if (unlikely(mode->num_rates < 0)) | |
47 | return TXRX_CONTINUE; | |
48 | ||
49 | rate = &mode->rates[0]; | |
50 | for (i = 0; i < mode->num_rates; i++) { | |
51 | if (mode->rates[i].val == rx->u.rx.status->rate) { | |
52 | rate = &mode->rates[i]; | |
53 | break; | |
54 | } | |
55 | } | |
56 | ||
57 | /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values, | |
58 | * 1 usec = 1/8 * (1080 / 10) = 13.5 */ | |
59 | ||
60 | if (mode->mode == MODE_IEEE80211A || | |
61 | mode->mode == MODE_ATHEROS_TURBO || | |
62 | mode->mode == MODE_ATHEROS_TURBOG || | |
63 | (mode->mode == MODE_IEEE80211G && | |
64 | rate->flags & IEEE80211_RATE_ERP)) | |
65 | hdrtime = CHAN_UTIL_HDR_SHORT; | |
66 | else | |
67 | hdrtime = CHAN_UTIL_HDR_LONG; | |
68 | ||
69 | load = hdrtime; | |
70 | if (!is_multicast_ether_addr(hdr->addr1)) | |
71 | load += hdrtime; | |
72 | ||
73 | load += skb->len * rate->rate_inv; | |
74 | ||
75 | /* Divide channel_use by 8 to avoid wrapping around the counter */ | |
76 | load >>= CHAN_UTIL_SHIFT; | |
77 | local->channel_use_raw += load; | |
78 | if (rx->sta) | |
79 | rx->sta->channel_use_raw += load; | |
80 | rx->u.rx.load = load; | |
81 | ||
82 | return TXRX_CONTINUE; | |
83 | } | |
84 | ||
85 | ieee80211_rx_handler ieee80211_rx_pre_handlers[] = | |
86 | { | |
87 | ieee80211_rx_h_parse_qos, | |
88 | ieee80211_rx_h_load_stats, | |
89 | NULL | |
90 | }; | |
91 | ||
92 | /* rx handlers */ | |
93 | ||
94 | static ieee80211_txrx_result | |
95 | ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx) | |
96 | { | |
97 | rx->sdata->channel_use_raw += rx->u.rx.load; | |
98 | return TXRX_CONTINUE; | |
99 | } | |
100 | ||
101 | static void | |
102 | ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb, | |
103 | struct ieee80211_rx_status *status) | |
104 | { | |
105 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
106 | struct ieee80211_sub_if_data *sdata; | |
107 | struct ieee80211_rate *rate; | |
108 | struct ieee80211_rtap_hdr { | |
109 | struct ieee80211_radiotap_header hdr; | |
110 | u8 flags; | |
111 | u8 rate; | |
112 | __le16 chan_freq; | |
113 | __le16 chan_flags; | |
114 | u8 antsignal; | |
115 | } __attribute__ ((packed)) *rthdr; | |
116 | ||
117 | skb->dev = dev; | |
118 | ||
119 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
120 | ||
121 | if (status->flag & RX_FLAG_RADIOTAP) | |
122 | goto out; | |
123 | ||
124 | if (skb_headroom(skb) < sizeof(*rthdr)) { | |
125 | I802_DEBUG_INC(local->rx_expand_skb_head); | |
126 | if (pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) { | |
127 | dev_kfree_skb(skb); | |
128 | return; | |
129 | } | |
130 | } | |
131 | ||
132 | rthdr = (struct ieee80211_rtap_hdr *) skb_push(skb, sizeof(*rthdr)); | |
133 | memset(rthdr, 0, sizeof(*rthdr)); | |
134 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
135 | rthdr->hdr.it_present = | |
136 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
137 | (1 << IEEE80211_RADIOTAP_RATE) | | |
138 | (1 << IEEE80211_RADIOTAP_CHANNEL) | | |
139 | (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL)); | |
140 | rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ? | |
141 | IEEE80211_RADIOTAP_F_FCS : 0; | |
142 | rate = ieee80211_get_rate(local, status->phymode, status->rate); | |
143 | if (rate) | |
144 | rthdr->rate = rate->rate / 5; | |
145 | rthdr->chan_freq = cpu_to_le16(status->freq); | |
146 | rthdr->chan_flags = | |
147 | status->phymode == MODE_IEEE80211A ? | |
148 | cpu_to_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ) : | |
149 | cpu_to_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ); | |
150 | rthdr->antsignal = status->ssi; | |
151 | ||
152 | out: | |
153 | sdata->stats.rx_packets++; | |
154 | sdata->stats.rx_bytes += skb->len; | |
155 | ||
156 | skb_set_mac_header(skb, 0); | |
157 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
158 | skb->pkt_type = PACKET_OTHERHOST; | |
159 | skb->protocol = htons(ETH_P_802_2); | |
160 | memset(skb->cb, 0, sizeof(skb->cb)); | |
161 | netif_rx(skb); | |
162 | } | |
163 | ||
164 | static ieee80211_txrx_result | |
165 | ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx) | |
166 | { | |
167 | if (rx->sdata->type == IEEE80211_IF_TYPE_MNTR) { | |
168 | ieee80211_rx_monitor(rx->dev, rx->skb, rx->u.rx.status); | |
169 | return TXRX_QUEUED; | |
170 | } | |
171 | ||
172 | if (rx->u.rx.status->flag & RX_FLAG_RADIOTAP) | |
173 | skb_pull(rx->skb, ieee80211_get_radiotap_len(rx->skb->data)); | |
174 | ||
175 | return TXRX_CONTINUE; | |
176 | } | |
177 | ||
178 | static ieee80211_txrx_result | |
179 | ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx) | |
180 | { | |
181 | struct ieee80211_local *local = rx->local; | |
182 | struct sk_buff *skb = rx->skb; | |
183 | ||
184 | if (unlikely(local->sta_scanning != 0)) { | |
185 | ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status); | |
186 | return TXRX_QUEUED; | |
187 | } | |
188 | ||
189 | if (unlikely(rx->u.rx.in_scan)) { | |
190 | /* scanning finished during invoking of handlers */ | |
191 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
192 | return TXRX_DROP; | |
193 | } | |
194 | ||
195 | return TXRX_CONTINUE; | |
196 | } | |
197 | ||
198 | static ieee80211_txrx_result | |
199 | ieee80211_rx_h_check(struct ieee80211_txrx_data *rx) | |
200 | { | |
201 | struct ieee80211_hdr *hdr; | |
202 | int always_sta_key; | |
203 | hdr = (struct ieee80211_hdr *) rx->skb->data; | |
204 | ||
205 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
206 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
207 | if (unlikely(rx->fc & IEEE80211_FCTL_RETRY && | |
208 | rx->sta->last_seq_ctrl[rx->u.rx.queue] == | |
209 | hdr->seq_ctrl)) { | |
210 | if (rx->u.rx.ra_match) { | |
211 | rx->local->dot11FrameDuplicateCount++; | |
212 | rx->sta->num_duplicates++; | |
213 | } | |
214 | return TXRX_DROP; | |
215 | } else | |
216 | rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl; | |
217 | } | |
218 | ||
219 | if ((rx->local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) && | |
220 | rx->skb->len > FCS_LEN) | |
221 | skb_trim(rx->skb, rx->skb->len - FCS_LEN); | |
222 | ||
223 | if (unlikely(rx->skb->len < 16)) { | |
224 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
225 | return TXRX_DROP; | |
226 | } | |
227 | ||
228 | if (!rx->u.rx.ra_match) | |
229 | rx->skb->pkt_type = PACKET_OTHERHOST; | |
230 | else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0) | |
231 | rx->skb->pkt_type = PACKET_HOST; | |
232 | else if (is_multicast_ether_addr(hdr->addr1)) { | |
233 | if (is_broadcast_ether_addr(hdr->addr1)) | |
234 | rx->skb->pkt_type = PACKET_BROADCAST; | |
235 | else | |
236 | rx->skb->pkt_type = PACKET_MULTICAST; | |
237 | } else | |
238 | rx->skb->pkt_type = PACKET_OTHERHOST; | |
239 | ||
240 | /* Drop disallowed frame classes based on STA auth/assoc state; | |
241 | * IEEE 802.11, Chap 5.5. | |
242 | * | |
243 | * 80211.o does filtering only based on association state, i.e., it | |
244 | * drops Class 3 frames from not associated stations. hostapd sends | |
245 | * deauth/disassoc frames when needed. In addition, hostapd is | |
246 | * responsible for filtering on both auth and assoc states. | |
247 | */ | |
248 | if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA || | |
249 | ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL && | |
250 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) && | |
251 | rx->sdata->type != IEEE80211_IF_TYPE_IBSS && | |
252 | (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) { | |
253 | if ((!(rx->fc & IEEE80211_FCTL_FROMDS) && | |
254 | !(rx->fc & IEEE80211_FCTL_TODS) && | |
255 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) | |
256 | || !rx->u.rx.ra_match) { | |
257 | /* Drop IBSS frames and frames for other hosts | |
258 | * silently. */ | |
259 | return TXRX_DROP; | |
260 | } | |
261 | ||
262 | if (!rx->local->apdev) | |
263 | return TXRX_DROP; | |
264 | ||
265 | ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status, | |
266 | ieee80211_msg_sta_not_assoc); | |
267 | return TXRX_QUEUED; | |
268 | } | |
269 | ||
270 | if (rx->sdata->type == IEEE80211_IF_TYPE_STA) | |
271 | always_sta_key = 0; | |
272 | else | |
273 | always_sta_key = 1; | |
274 | ||
275 | if (rx->sta && rx->sta->key && always_sta_key) { | |
276 | rx->key = rx->sta->key; | |
277 | } else { | |
278 | if (rx->sta && rx->sta->key) | |
279 | rx->key = rx->sta->key; | |
280 | else | |
281 | rx->key = rx->sdata->default_key; | |
282 | ||
283 | if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) && | |
284 | rx->fc & IEEE80211_FCTL_PROTECTED) { | |
285 | int keyidx = ieee80211_wep_get_keyidx(rx->skb); | |
286 | ||
287 | if (keyidx >= 0 && keyidx < NUM_DEFAULT_KEYS && | |
288 | (!rx->sta || !rx->sta->key || keyidx > 0)) | |
289 | rx->key = rx->sdata->keys[keyidx]; | |
290 | ||
291 | if (!rx->key) { | |
292 | if (!rx->u.rx.ra_match) | |
293 | return TXRX_DROP; | |
294 | printk(KERN_DEBUG "%s: RX WEP frame with " | |
295 | "unknown keyidx %d (A1=" MAC_FMT " A2=" | |
296 | MAC_FMT " A3=" MAC_FMT ")\n", | |
297 | rx->dev->name, keyidx, | |
298 | MAC_ARG(hdr->addr1), | |
299 | MAC_ARG(hdr->addr2), | |
300 | MAC_ARG(hdr->addr3)); | |
301 | if (!rx->local->apdev) | |
302 | return TXRX_DROP; | |
303 | ieee80211_rx_mgmt( | |
304 | rx->local, rx->skb, rx->u.rx.status, | |
305 | ieee80211_msg_wep_frame_unknown_key); | |
306 | return TXRX_QUEUED; | |
307 | } | |
308 | } | |
309 | } | |
310 | ||
311 | if (rx->fc & IEEE80211_FCTL_PROTECTED && rx->key && rx->u.rx.ra_match) { | |
312 | rx->key->tx_rx_count++; | |
313 | if (unlikely(rx->local->key_tx_rx_threshold && | |
314 | rx->key->tx_rx_count > | |
315 | rx->local->key_tx_rx_threshold)) { | |
316 | ieee80211_key_threshold_notify(rx->dev, rx->key, | |
317 | rx->sta); | |
318 | } | |
319 | } | |
320 | ||
321 | return TXRX_CONTINUE; | |
322 | } | |
323 | ||
324 | static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta) | |
325 | { | |
326 | struct ieee80211_sub_if_data *sdata; | |
327 | sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); | |
328 | ||
329 | if (sdata->bss) | |
330 | atomic_inc(&sdata->bss->num_sta_ps); | |
331 | sta->flags |= WLAN_STA_PS; | |
332 | sta->pspoll = 0; | |
333 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
334 | printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d enters power " | |
335 | "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid); | |
336 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
337 | } | |
338 | ||
339 | static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta) | |
340 | { | |
341 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
342 | struct sk_buff *skb; | |
343 | int sent = 0; | |
344 | struct ieee80211_sub_if_data *sdata; | |
345 | struct ieee80211_tx_packet_data *pkt_data; | |
346 | ||
347 | sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); | |
348 | if (sdata->bss) | |
349 | atomic_dec(&sdata->bss->num_sta_ps); | |
350 | sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM); | |
351 | sta->pspoll = 0; | |
352 | if (!skb_queue_empty(&sta->ps_tx_buf)) { | |
353 | if (local->ops->set_tim) | |
354 | local->ops->set_tim(local_to_hw(local), sta->aid, 0); | |
355 | if (sdata->bss) | |
356 | bss_tim_clear(local, sdata->bss, sta->aid); | |
357 | } | |
358 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
359 | printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d exits power " | |
360 | "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid); | |
361 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
362 | /* Send all buffered frames to the station */ | |
363 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
364 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; | |
365 | sent++; | |
366 | pkt_data->requeue = 1; | |
367 | dev_queue_xmit(skb); | |
368 | } | |
369 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
370 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; | |
371 | local->total_ps_buffered--; | |
372 | sent++; | |
373 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
374 | printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d send PS frame " | |
375 | "since STA not sleeping anymore\n", dev->name, | |
376 | MAC_ARG(sta->addr), sta->aid); | |
377 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
378 | pkt_data->requeue = 1; | |
379 | dev_queue_xmit(skb); | |
380 | } | |
381 | ||
382 | return sent; | |
383 | } | |
384 | ||
385 | static ieee80211_txrx_result | |
386 | ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx) | |
387 | { | |
388 | struct sta_info *sta = rx->sta; | |
389 | struct net_device *dev = rx->dev; | |
390 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
391 | ||
392 | if (!sta) | |
393 | return TXRX_CONTINUE; | |
394 | ||
395 | /* Update last_rx only for IBSS packets which are for the current | |
396 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
397 | * other STAs are using different BSSID. */ | |
398 | if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) { | |
399 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len); | |
400 | if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0) | |
401 | sta->last_rx = jiffies; | |
402 | } else | |
403 | if (!is_multicast_ether_addr(hdr->addr1) || | |
404 | rx->sdata->type == IEEE80211_IF_TYPE_STA) { | |
405 | /* Update last_rx only for unicast frames in order to prevent | |
406 | * the Probe Request frames (the only broadcast frames from a | |
407 | * STA in infrastructure mode) from keeping a connection alive. | |
408 | */ | |
409 | sta->last_rx = jiffies; | |
410 | } | |
411 | ||
412 | if (!rx->u.rx.ra_match) | |
413 | return TXRX_CONTINUE; | |
414 | ||
415 | sta->rx_fragments++; | |
416 | sta->rx_bytes += rx->skb->len; | |
417 | sta->last_rssi = (sta->last_rssi * 15 + | |
418 | rx->u.rx.status->ssi) / 16; | |
419 | sta->last_signal = (sta->last_signal * 15 + | |
420 | rx->u.rx.status->signal) / 16; | |
421 | sta->last_noise = (sta->last_noise * 15 + | |
422 | rx->u.rx.status->noise) / 16; | |
423 | ||
424 | if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) { | |
425 | /* Change STA power saving mode only in the end of a frame | |
426 | * exchange sequence */ | |
427 | if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM)) | |
428 | rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta); | |
429 | else if (!(sta->flags & WLAN_STA_PS) && | |
430 | (rx->fc & IEEE80211_FCTL_PM)) | |
431 | ap_sta_ps_start(dev, sta); | |
432 | } | |
433 | ||
434 | /* Drop data::nullfunc frames silently, since they are used only to | |
435 | * control station power saving mode. */ | |
436 | if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
437 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) { | |
438 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); | |
439 | /* Update counter and free packet here to avoid counting this | |
440 | * as a dropped packed. */ | |
441 | sta->rx_packets++; | |
442 | dev_kfree_skb(rx->skb); | |
443 | return TXRX_QUEUED; | |
444 | } | |
445 | ||
446 | return TXRX_CONTINUE; | |
447 | } /* ieee80211_rx_h_sta_process */ | |
448 | ||
449 | static ieee80211_txrx_result | |
450 | ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx) | |
451 | { | |
452 | if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) || | |
453 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA || | |
454 | !rx->key || rx->key->alg != ALG_WEP || !rx->u.rx.ra_match) | |
455 | return TXRX_CONTINUE; | |
456 | ||
457 | /* Check for weak IVs, if hwaccel did not remove IV from the frame */ | |
458 | if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) || | |
459 | rx->key->force_sw_encrypt) { | |
460 | u8 *iv = ieee80211_wep_is_weak_iv(rx->skb, rx->key); | |
461 | if (iv) { | |
462 | rx->sta->wep_weak_iv_count++; | |
463 | } | |
464 | } | |
465 | ||
466 | return TXRX_CONTINUE; | |
467 | } | |
468 | ||
469 | static ieee80211_txrx_result | |
470 | ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx) | |
471 | { | |
472 | /* If the device handles decryption totally, skip this test */ | |
473 | if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP) | |
474 | return TXRX_CONTINUE; | |
475 | ||
476 | if ((rx->key && rx->key->alg != ALG_WEP) || | |
477 | !(rx->fc & IEEE80211_FCTL_PROTECTED) || | |
478 | ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA && | |
479 | ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || | |
480 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH))) | |
481 | return TXRX_CONTINUE; | |
482 | ||
483 | if (!rx->key) { | |
484 | printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n", | |
485 | rx->dev->name); | |
486 | return TXRX_DROP; | |
487 | } | |
488 | ||
489 | if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED) || | |
490 | rx->key->force_sw_encrypt) { | |
491 | if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) { | |
492 | printk(KERN_DEBUG "%s: RX WEP frame, decrypt " | |
493 | "failed\n", rx->dev->name); | |
494 | return TXRX_DROP; | |
495 | } | |
496 | } else if (rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) { | |
497 | ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key); | |
498 | /* remove ICV */ | |
499 | skb_trim(rx->skb, rx->skb->len - 4); | |
500 | } | |
501 | ||
502 | return TXRX_CONTINUE; | |
503 | } | |
504 | ||
505 | static inline struct ieee80211_fragment_entry * | |
506 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
507 | unsigned int frag, unsigned int seq, int rx_queue, | |
508 | struct sk_buff **skb) | |
509 | { | |
510 | struct ieee80211_fragment_entry *entry; | |
511 | int idx; | |
512 | ||
513 | idx = sdata->fragment_next; | |
514 | entry = &sdata->fragments[sdata->fragment_next++]; | |
515 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
516 | sdata->fragment_next = 0; | |
517 | ||
518 | if (!skb_queue_empty(&entry->skb_list)) { | |
519 | #ifdef CONFIG_MAC80211_DEBUG | |
520 | struct ieee80211_hdr *hdr = | |
521 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
522 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
523 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
524 | "addr1=" MAC_FMT " addr2=" MAC_FMT "\n", | |
525 | sdata->dev->name, idx, | |
526 | jiffies - entry->first_frag_time, entry->seq, | |
527 | entry->last_frag, MAC_ARG(hdr->addr1), | |
528 | MAC_ARG(hdr->addr2)); | |
529 | #endif /* CONFIG_MAC80211_DEBUG */ | |
530 | __skb_queue_purge(&entry->skb_list); | |
531 | } | |
532 | ||
533 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
534 | *skb = NULL; | |
535 | entry->first_frag_time = jiffies; | |
536 | entry->seq = seq; | |
537 | entry->rx_queue = rx_queue; | |
538 | entry->last_frag = frag; | |
539 | entry->ccmp = 0; | |
540 | entry->extra_len = 0; | |
541 | ||
542 | return entry; | |
543 | } | |
544 | ||
545 | static inline struct ieee80211_fragment_entry * | |
546 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
547 | u16 fc, unsigned int frag, unsigned int seq, | |
548 | int rx_queue, struct ieee80211_hdr *hdr) | |
549 | { | |
550 | struct ieee80211_fragment_entry *entry; | |
551 | int i, idx; | |
552 | ||
553 | idx = sdata->fragment_next; | |
554 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
555 | struct ieee80211_hdr *f_hdr; | |
556 | u16 f_fc; | |
557 | ||
558 | idx--; | |
559 | if (idx < 0) | |
560 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
561 | ||
562 | entry = &sdata->fragments[idx]; | |
563 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
564 | entry->rx_queue != rx_queue || | |
565 | entry->last_frag + 1 != frag) | |
566 | continue; | |
567 | ||
568 | f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data; | |
569 | f_fc = le16_to_cpu(f_hdr->frame_control); | |
570 | ||
571 | if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) || | |
572 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || | |
573 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
574 | continue; | |
575 | ||
576 | if (entry->first_frag_time + 2 * HZ < jiffies) { | |
577 | __skb_queue_purge(&entry->skb_list); | |
578 | continue; | |
579 | } | |
580 | return entry; | |
581 | } | |
582 | ||
583 | return NULL; | |
584 | } | |
585 | ||
586 | static ieee80211_txrx_result | |
587 | ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx) | |
588 | { | |
589 | struct ieee80211_hdr *hdr; | |
590 | u16 sc; | |
591 | unsigned int frag, seq; | |
592 | struct ieee80211_fragment_entry *entry; | |
593 | struct sk_buff *skb; | |
594 | ||
595 | hdr = (struct ieee80211_hdr *) rx->skb->data; | |
596 | sc = le16_to_cpu(hdr->seq_ctrl); | |
597 | frag = sc & IEEE80211_SCTL_FRAG; | |
598 | ||
599 | if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) || | |
600 | (rx->skb)->len < 24 || | |
601 | is_multicast_ether_addr(hdr->addr1))) { | |
602 | /* not fragmented */ | |
603 | goto out; | |
604 | } | |
605 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
606 | ||
607 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
608 | ||
609 | if (frag == 0) { | |
610 | /* This is the first fragment of a new frame. */ | |
611 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
612 | rx->u.rx.queue, &(rx->skb)); | |
613 | if (rx->key && rx->key->alg == ALG_CCMP && | |
614 | (rx->fc & IEEE80211_FCTL_PROTECTED)) { | |
615 | /* Store CCMP PN so that we can verify that the next | |
616 | * fragment has a sequential PN value. */ | |
617 | entry->ccmp = 1; | |
618 | memcpy(entry->last_pn, | |
619 | rx->key->u.ccmp.rx_pn[rx->u.rx.queue], | |
620 | CCMP_PN_LEN); | |
621 | } | |
622 | return TXRX_QUEUED; | |
623 | } | |
624 | ||
625 | /* This is a fragment for a frame that should already be pending in | |
626 | * fragment cache. Add this fragment to the end of the pending entry. | |
627 | */ | |
628 | entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq, | |
629 | rx->u.rx.queue, hdr); | |
630 | if (!entry) { | |
631 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
632 | return TXRX_DROP; | |
633 | } | |
634 | ||
635 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
636 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
637 | if (entry->ccmp) { | |
638 | int i; | |
639 | u8 pn[CCMP_PN_LEN], *rpn; | |
640 | if (!rx->key || rx->key->alg != ALG_CCMP) | |
641 | return TXRX_DROP; | |
642 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); | |
643 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
644 | pn[i]++; | |
645 | if (pn[i]) | |
646 | break; | |
647 | } | |
648 | rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue]; | |
649 | if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) { | |
650 | printk(KERN_DEBUG "%s: defrag: CCMP PN not sequential" | |
651 | " A2=" MAC_FMT " PN=%02x%02x%02x%02x%02x%02x " | |
652 | "(expected %02x%02x%02x%02x%02x%02x)\n", | |
653 | rx->dev->name, MAC_ARG(hdr->addr2), | |
654 | rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], rpn[5], | |
655 | pn[0], pn[1], pn[2], pn[3], pn[4], pn[5]); | |
656 | return TXRX_DROP; | |
657 | } | |
658 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); | |
659 | } | |
660 | ||
661 | skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc)); | |
662 | __skb_queue_tail(&entry->skb_list, rx->skb); | |
663 | entry->last_frag = frag; | |
664 | entry->extra_len += rx->skb->len; | |
665 | if (rx->fc & IEEE80211_FCTL_MOREFRAGS) { | |
666 | rx->skb = NULL; | |
667 | return TXRX_QUEUED; | |
668 | } | |
669 | ||
670 | rx->skb = __skb_dequeue(&entry->skb_list); | |
671 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
672 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
673 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
674 | GFP_ATOMIC))) { | |
675 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
676 | __skb_queue_purge(&entry->skb_list); | |
677 | return TXRX_DROP; | |
678 | } | |
679 | } | |
680 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
681 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
682 | dev_kfree_skb(skb); | |
683 | } | |
684 | ||
685 | /* Complete frame has been reassembled - process it now */ | |
686 | rx->fragmented = 1; | |
687 | ||
688 | out: | |
689 | if (rx->sta) | |
690 | rx->sta->rx_packets++; | |
691 | if (is_multicast_ether_addr(hdr->addr1)) | |
692 | rx->local->dot11MulticastReceivedFrameCount++; | |
693 | else | |
694 | ieee80211_led_rx(rx->local); | |
695 | return TXRX_CONTINUE; | |
696 | } | |
697 | ||
698 | static ieee80211_txrx_result | |
699 | ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx) | |
700 | { | |
701 | struct sk_buff *skb; | |
702 | int no_pending_pkts; | |
703 | ||
704 | if (likely(!rx->sta || | |
705 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL || | |
706 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL || | |
707 | !rx->u.rx.ra_match)) | |
708 | return TXRX_CONTINUE; | |
709 | ||
710 | skb = skb_dequeue(&rx->sta->tx_filtered); | |
711 | if (!skb) { | |
712 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
713 | if (skb) | |
714 | rx->local->total_ps_buffered--; | |
715 | } | |
716 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
717 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
718 | ||
719 | if (skb) { | |
720 | struct ieee80211_hdr *hdr = | |
721 | (struct ieee80211_hdr *) skb->data; | |
722 | ||
723 | /* tell TX path to send one frame even though the STA may | |
724 | * still remain is PS mode after this frame exchange */ | |
725 | rx->sta->pspoll = 1; | |
726 | ||
727 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
728 | printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS Poll (entries " | |
729 | "after %d)\n", | |
730 | MAC_ARG(rx->sta->addr), rx->sta->aid, | |
731 | skb_queue_len(&rx->sta->ps_tx_buf)); | |
732 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
733 | ||
734 | /* Use MoreData flag to indicate whether there are more | |
735 | * buffered frames for this STA */ | |
736 | if (no_pending_pkts) { | |
737 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); | |
738 | rx->sta->flags &= ~WLAN_STA_TIM; | |
739 | } else | |
740 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
741 | ||
742 | dev_queue_xmit(skb); | |
743 | ||
744 | if (no_pending_pkts) { | |
745 | if (rx->local->ops->set_tim) | |
746 | rx->local->ops->set_tim(local_to_hw(rx->local), | |
747 | rx->sta->aid, 0); | |
748 | if (rx->sdata->bss) | |
749 | bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid); | |
750 | } | |
751 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
752 | } else if (!rx->u.rx.sent_ps_buffered) { | |
753 | printk(KERN_DEBUG "%s: STA " MAC_FMT " sent PS Poll even " | |
754 | "though there is no buffered frames for it\n", | |
755 | rx->dev->name, MAC_ARG(rx->sta->addr)); | |
756 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
757 | ||
758 | } | |
759 | ||
760 | /* Free PS Poll skb here instead of returning TXRX_DROP that would | |
761 | * count as an dropped frame. */ | |
762 | dev_kfree_skb(rx->skb); | |
763 | ||
764 | return TXRX_QUEUED; | |
765 | } | |
766 | ||
767 | static ieee80211_txrx_result | |
768 | ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx) | |
769 | { | |
770 | if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) && | |
771 | rx->sdata->type != IEEE80211_IF_TYPE_STA && rx->u.rx.ra_match) { | |
772 | /* Pass both encrypted and unencrypted EAPOL frames to user | |
773 | * space for processing. */ | |
774 | if (!rx->local->apdev) | |
775 | return TXRX_DROP; | |
776 | ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status, | |
777 | ieee80211_msg_normal); | |
778 | return TXRX_QUEUED; | |
779 | } | |
780 | ||
781 | if (unlikely(rx->sdata->ieee802_1x && | |
782 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
783 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC && | |
784 | (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) && | |
785 | !ieee80211_is_eapol(rx->skb))) { | |
786 | #ifdef CONFIG_MAC80211_DEBUG | |
787 | struct ieee80211_hdr *hdr = | |
788 | (struct ieee80211_hdr *) rx->skb->data; | |
789 | printk(KERN_DEBUG "%s: dropped frame from " MAC_FMT | |
790 | " (unauthorized port)\n", rx->dev->name, | |
791 | MAC_ARG(hdr->addr2)); | |
792 | #endif /* CONFIG_MAC80211_DEBUG */ | |
793 | return TXRX_DROP; | |
794 | } | |
795 | ||
796 | return TXRX_CONTINUE; | |
797 | } | |
798 | ||
799 | static ieee80211_txrx_result | |
800 | ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx) | |
801 | { | |
802 | /* If the device handles decryption totally, skip this test */ | |
803 | if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP) | |
804 | return TXRX_CONTINUE; | |
805 | ||
806 | /* Drop unencrypted frames if key is set. */ | |
807 | if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) && | |
808 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
809 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC && | |
810 | (rx->key || rx->sdata->drop_unencrypted) && | |
811 | (rx->sdata->eapol == 0 || | |
812 | !ieee80211_is_eapol(rx->skb)))) { | |
813 | printk(KERN_DEBUG "%s: RX non-WEP frame, but expected " | |
814 | "encryption\n", rx->dev->name); | |
815 | return TXRX_DROP; | |
816 | } | |
817 | return TXRX_CONTINUE; | |
818 | } | |
819 | ||
820 | static ieee80211_txrx_result | |
821 | ieee80211_rx_h_data(struct ieee80211_txrx_data *rx) | |
822 | { | |
823 | struct net_device *dev = rx->dev; | |
824 | struct ieee80211_local *local = rx->local; | |
825 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
826 | u16 fc, hdrlen, ethertype; | |
827 | u8 *payload; | |
828 | u8 dst[ETH_ALEN]; | |
829 | u8 src[ETH_ALEN]; | |
830 | struct sk_buff *skb = rx->skb, *skb2; | |
831 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
832 | ||
833 | fc = rx->fc; | |
834 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
835 | return TXRX_CONTINUE; | |
836 | ||
837 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
838 | return TXRX_DROP; | |
839 | ||
840 | hdrlen = ieee80211_get_hdrlen(fc); | |
841 | ||
842 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
843 | * header | |
844 | * IEEE 802.11 address fields: | |
845 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
846 | * 0 0 DA SA BSSID n/a | |
847 | * 0 1 DA BSSID SA n/a | |
848 | * 1 0 BSSID SA DA n/a | |
849 | * 1 1 RA TA DA SA | |
850 | */ | |
851 | ||
852 | switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
853 | case IEEE80211_FCTL_TODS: | |
854 | /* BSSID SA DA */ | |
855 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
856 | memcpy(src, hdr->addr2, ETH_ALEN); | |
857 | ||
858 | if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP && | |
859 | sdata->type != IEEE80211_IF_TYPE_VLAN)) { | |
860 | printk(KERN_DEBUG "%s: dropped ToDS frame (BSSID=" | |
861 | MAC_FMT " SA=" MAC_FMT " DA=" MAC_FMT ")\n", | |
862 | dev->name, MAC_ARG(hdr->addr1), | |
863 | MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3)); | |
864 | return TXRX_DROP; | |
865 | } | |
866 | break; | |
867 | case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
868 | /* RA TA DA SA */ | |
869 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
870 | memcpy(src, hdr->addr4, ETH_ALEN); | |
871 | ||
872 | if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) { | |
873 | printk(KERN_DEBUG "%s: dropped FromDS&ToDS frame (RA=" | |
874 | MAC_FMT " TA=" MAC_FMT " DA=" MAC_FMT " SA=" | |
875 | MAC_FMT ")\n", | |
876 | rx->dev->name, MAC_ARG(hdr->addr1), | |
877 | MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3), | |
878 | MAC_ARG(hdr->addr4)); | |
879 | return TXRX_DROP; | |
880 | } | |
881 | break; | |
882 | case IEEE80211_FCTL_FROMDS: | |
883 | /* DA BSSID SA */ | |
884 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
885 | memcpy(src, hdr->addr3, ETH_ALEN); | |
886 | ||
887 | if (sdata->type != IEEE80211_IF_TYPE_STA) { | |
888 | return TXRX_DROP; | |
889 | } | |
890 | break; | |
891 | case 0: | |
892 | /* DA SA BSSID */ | |
893 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
894 | memcpy(src, hdr->addr2, ETH_ALEN); | |
895 | ||
896 | if (sdata->type != IEEE80211_IF_TYPE_IBSS) { | |
897 | if (net_ratelimit()) { | |
898 | printk(KERN_DEBUG "%s: dropped IBSS frame (DA=" | |
899 | MAC_FMT " SA=" MAC_FMT " BSSID=" MAC_FMT | |
900 | ")\n", | |
901 | dev->name, MAC_ARG(hdr->addr1), | |
902 | MAC_ARG(hdr->addr2), | |
903 | MAC_ARG(hdr->addr3)); | |
904 | } | |
905 | return TXRX_DROP; | |
906 | } | |
907 | break; | |
908 | } | |
909 | ||
910 | payload = skb->data + hdrlen; | |
911 | ||
912 | if (unlikely(skb->len - hdrlen < 8)) { | |
913 | if (net_ratelimit()) { | |
914 | printk(KERN_DEBUG "%s: RX too short data frame " | |
915 | "payload\n", dev->name); | |
916 | } | |
917 | return TXRX_DROP; | |
918 | } | |
919 | ||
920 | ethertype = (payload[6] << 8) | payload[7]; | |
921 | ||
922 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
923 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
924 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
925 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
926 | * replace EtherType */ | |
927 | skb_pull(skb, hdrlen + 6); | |
928 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
929 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
930 | } else { | |
931 | struct ethhdr *ehdr; | |
932 | __be16 len; | |
933 | skb_pull(skb, hdrlen); | |
934 | len = htons(skb->len); | |
935 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
936 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
937 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
938 | ehdr->h_proto = len; | |
939 | } | |
940 | skb->dev = dev; | |
941 | ||
942 | skb2 = NULL; | |
943 | ||
944 | sdata->stats.rx_packets++; | |
945 | sdata->stats.rx_bytes += skb->len; | |
946 | ||
947 | if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP | |
948 | || sdata->type == IEEE80211_IF_TYPE_VLAN) && rx->u.rx.ra_match) { | |
949 | if (is_multicast_ether_addr(skb->data)) { | |
950 | /* send multicast frames both to higher layers in | |
951 | * local net stack and back to the wireless media */ | |
952 | skb2 = skb_copy(skb, GFP_ATOMIC); | |
953 | if (!skb2) | |
954 | printk(KERN_DEBUG "%s: failed to clone " | |
955 | "multicast frame\n", dev->name); | |
956 | } else { | |
957 | struct sta_info *dsta; | |
958 | dsta = sta_info_get(local, skb->data); | |
959 | if (dsta && !dsta->dev) { | |
960 | printk(KERN_DEBUG "Station with null dev " | |
961 | "structure!\n"); | |
962 | } else if (dsta && dsta->dev == dev) { | |
963 | /* Destination station is associated to this | |
964 | * AP, so send the frame directly to it and | |
965 | * do not pass the frame to local net stack. | |
966 | */ | |
967 | skb2 = skb; | |
968 | skb = NULL; | |
969 | } | |
970 | if (dsta) | |
971 | sta_info_put(dsta); | |
972 | } | |
973 | } | |
974 | ||
975 | if (skb) { | |
976 | /* deliver to local stack */ | |
977 | skb->protocol = eth_type_trans(skb, dev); | |
978 | memset(skb->cb, 0, sizeof(skb->cb)); | |
979 | netif_rx(skb); | |
980 | } | |
981 | ||
982 | if (skb2) { | |
983 | /* send to wireless media */ | |
984 | skb2->protocol = __constant_htons(ETH_P_802_3); | |
985 | skb_set_network_header(skb2, 0); | |
986 | skb_set_mac_header(skb2, 0); | |
987 | dev_queue_xmit(skb2); | |
988 | } | |
989 | ||
990 | return TXRX_QUEUED; | |
991 | } | |
992 | ||
993 | static ieee80211_txrx_result | |
994 | ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx) | |
995 | { | |
996 | struct ieee80211_sub_if_data *sdata; | |
997 | ||
998 | if (!rx->u.rx.ra_match) | |
999 | return TXRX_DROP; | |
1000 | ||
1001 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1002 | if ((sdata->type == IEEE80211_IF_TYPE_STA || | |
1003 | sdata->type == IEEE80211_IF_TYPE_IBSS) && | |
1004 | !rx->local->user_space_mlme) { | |
1005 | ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status); | |
1006 | } else { | |
1007 | /* Management frames are sent to hostapd for processing */ | |
1008 | if (!rx->local->apdev) | |
1009 | return TXRX_DROP; | |
1010 | ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status, | |
1011 | ieee80211_msg_normal); | |
1012 | } | |
1013 | return TXRX_QUEUED; | |
1014 | } | |
1015 | ||
1016 | static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers( | |
1017 | struct ieee80211_local *local, | |
1018 | ieee80211_rx_handler *handlers, | |
1019 | struct ieee80211_txrx_data *rx, | |
1020 | struct sta_info *sta) | |
1021 | { | |
1022 | ieee80211_rx_handler *handler; | |
1023 | ieee80211_txrx_result res = TXRX_DROP; | |
1024 | ||
1025 | for (handler = handlers; *handler != NULL; handler++) { | |
1026 | res = (*handler)(rx); | |
1027 | if (res != TXRX_CONTINUE) { | |
1028 | if (res == TXRX_DROP) { | |
1029 | I802_DEBUG_INC(local->rx_handlers_drop); | |
1030 | if (sta) | |
1031 | sta->rx_dropped++; | |
1032 | } | |
1033 | if (res == TXRX_QUEUED) | |
1034 | I802_DEBUG_INC(local->rx_handlers_queued); | |
1035 | break; | |
1036 | } | |
1037 | } | |
1038 | ||
1039 | if (res == TXRX_DROP) { | |
1040 | dev_kfree_skb(rx->skb); | |
1041 | } | |
1042 | return res; | |
1043 | } | |
1044 | ||
1045 | static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local, | |
1046 | ieee80211_rx_handler *handlers, | |
1047 | struct ieee80211_txrx_data *rx, | |
1048 | struct sta_info *sta) | |
1049 | { | |
1050 | if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) == | |
1051 | TXRX_CONTINUE) | |
1052 | dev_kfree_skb(rx->skb); | |
1053 | } | |
1054 | ||
1055 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, | |
1056 | struct ieee80211_hdr *hdr, | |
1057 | struct sta_info *sta, | |
1058 | struct ieee80211_txrx_data *rx) | |
1059 | { | |
1060 | int keyidx, hdrlen; | |
1061 | ||
1062 | hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb); | |
1063 | if (rx->skb->len >= hdrlen + 4) | |
1064 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1065 | else | |
1066 | keyidx = -1; | |
1067 | ||
1068 | /* TODO: verify that this is not triggered by fragmented | |
1069 | * frames (hw does not verify MIC for them). */ | |
1070 | printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC " | |
1071 | "failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n", | |
1072 | dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1), keyidx); | |
1073 | ||
1074 | if (!sta) { | |
1075 | /* Some hardware versions seem to generate incorrect | |
1076 | * Michael MIC reports; ignore them to avoid triggering | |
1077 | * countermeasures. */ | |
1078 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
1079 | "error for unknown address " MAC_FMT "\n", | |
1080 | dev->name, MAC_ARG(hdr->addr2)); | |
1081 | goto ignore; | |
1082 | } | |
1083 | ||
1084 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) { | |
1085 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
1086 | "error for a frame with no ISWEP flag (src " | |
1087 | MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2)); | |
1088 | goto ignore; | |
1089 | } | |
1090 | ||
1091 | if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) && | |
1092 | rx->sdata->type == IEEE80211_IF_TYPE_AP) { | |
1093 | keyidx = ieee80211_wep_get_keyidx(rx->skb); | |
1094 | /* AP with Pairwise keys support should never receive Michael | |
1095 | * MIC errors for non-zero keyidx because these are reserved | |
1096 | * for group keys and only the AP is sending real multicast | |
1097 | * frames in BSS. */ | |
1098 | if (keyidx) { | |
1099 | printk(KERN_DEBUG "%s: ignored Michael MIC error for " | |
1100 | "a frame with non-zero keyidx (%d) (src " MAC_FMT | |
1101 | ")\n", dev->name, keyidx, MAC_ARG(hdr->addr2)); | |
1102 | goto ignore; | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA && | |
1107 | ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || | |
1108 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) { | |
1109 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
1110 | "error for a frame that cannot be encrypted " | |
1111 | "(fc=0x%04x) (src " MAC_FMT ")\n", | |
1112 | dev->name, rx->fc, MAC_ARG(hdr->addr2)); | |
1113 | goto ignore; | |
1114 | } | |
1115 | ||
1116 | do { | |
1117 | union iwreq_data wrqu; | |
1118 | char *buf = kmalloc(128, GFP_ATOMIC); | |
1119 | if (!buf) | |
1120 | break; | |
1121 | ||
1122 | /* TODO: needed parameters: count, key type, TSC */ | |
1123 | sprintf(buf, "MLME-MICHAELMICFAILURE.indication(" | |
1124 | "keyid=%d %scast addr=" MAC_FMT ")", | |
1125 | keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni", | |
1126 | MAC_ARG(hdr->addr2)); | |
1127 | memset(&wrqu, 0, sizeof(wrqu)); | |
1128 | wrqu.data.length = strlen(buf); | |
1129 | wireless_send_event(rx->dev, IWEVCUSTOM, &wrqu, buf); | |
1130 | kfree(buf); | |
1131 | } while (0); | |
1132 | ||
1133 | /* TODO: consider verifying the MIC error report with software | |
1134 | * implementation if we get too many spurious reports from the | |
1135 | * hardware. */ | |
1136 | if (!rx->local->apdev) | |
1137 | goto ignore; | |
1138 | ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status, | |
1139 | ieee80211_msg_michael_mic_failure); | |
1140 | return; | |
1141 | ||
1142 | ignore: | |
1143 | dev_kfree_skb(rx->skb); | |
1144 | rx->skb = NULL; | |
1145 | } | |
1146 | ||
1147 | ieee80211_rx_handler ieee80211_rx_handlers[] = | |
1148 | { | |
1149 | ieee80211_rx_h_if_stats, | |
1150 | ieee80211_rx_h_monitor, | |
1151 | ieee80211_rx_h_passive_scan, | |
1152 | ieee80211_rx_h_check, | |
1153 | ieee80211_rx_h_sta_process, | |
1154 | ieee80211_rx_h_ccmp_decrypt, | |
1155 | ieee80211_rx_h_tkip_decrypt, | |
1156 | ieee80211_rx_h_wep_weak_iv_detection, | |
1157 | ieee80211_rx_h_wep_decrypt, | |
1158 | ieee80211_rx_h_defragment, | |
1159 | ieee80211_rx_h_ps_poll, | |
1160 | ieee80211_rx_h_michael_mic_verify, | |
1161 | /* this must be after decryption - so header is counted in MPDU mic | |
1162 | * must be before pae and data, so QOS_DATA format frames | |
1163 | * are not passed to user space by these functions | |
1164 | */ | |
1165 | ieee80211_rx_h_remove_qos_control, | |
1166 | ieee80211_rx_h_802_1x_pae, | |
1167 | ieee80211_rx_h_drop_unencrypted, | |
1168 | ieee80211_rx_h_data, | |
1169 | ieee80211_rx_h_mgmt, | |
1170 | NULL | |
1171 | }; | |
1172 | ||
1173 | /* main receive path */ | |
1174 | ||
1175 | /* | |
1176 | * This is the receive path handler. It is called by a low level driver when an | |
1177 | * 802.11 MPDU is received from the hardware. | |
1178 | */ | |
1179 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
1180 | struct ieee80211_rx_status *status) | |
1181 | { | |
1182 | struct ieee80211_local *local = hw_to_local(hw); | |
1183 | struct ieee80211_sub_if_data *sdata; | |
1184 | struct sta_info *sta; | |
1185 | struct ieee80211_hdr *hdr; | |
1186 | struct ieee80211_txrx_data rx; | |
1187 | u16 type; | |
1188 | int multicast; | |
1189 | int radiotap_len = 0; | |
1190 | ||
1191 | if (status->flag & RX_FLAG_RADIOTAP) { | |
1192 | radiotap_len = ieee80211_get_radiotap_len(skb->data); | |
1193 | skb_pull(skb, radiotap_len); | |
1194 | } | |
1195 | ||
1196 | hdr = (struct ieee80211_hdr *) skb->data; | |
1197 | memset(&rx, 0, sizeof(rx)); | |
1198 | rx.skb = skb; | |
1199 | rx.local = local; | |
1200 | ||
1201 | rx.u.rx.status = status; | |
1202 | rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0; | |
1203 | type = rx.fc & IEEE80211_FCTL_FTYPE; | |
1204 | if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT) | |
1205 | local->dot11ReceivedFragmentCount++; | |
1206 | multicast = is_multicast_ether_addr(hdr->addr1); | |
1207 | ||
1208 | if (skb->len >= 16) | |
1209 | sta = rx.sta = sta_info_get(local, hdr->addr2); | |
1210 | else | |
1211 | sta = rx.sta = NULL; | |
1212 | ||
1213 | if (sta) { | |
1214 | rx.dev = sta->dev; | |
1215 | rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev); | |
1216 | } | |
1217 | ||
1218 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { | |
1219 | ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx); | |
1220 | goto end; | |
1221 | } | |
1222 | ||
1223 | if (unlikely(local->sta_scanning)) | |
1224 | rx.u.rx.in_scan = 1; | |
1225 | ||
1226 | if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx, | |
1227 | sta) != TXRX_CONTINUE) | |
1228 | goto end; | |
1229 | skb = rx.skb; | |
1230 | ||
1231 | skb_push(skb, radiotap_len); | |
1232 | if (sta && !sta->assoc_ap && !(sta->flags & WLAN_STA_WDS) && | |
1233 | !local->iff_promiscs && !multicast) { | |
1234 | rx.u.rx.ra_match = 1; | |
1235 | ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx, | |
1236 | sta); | |
1237 | } else { | |
1238 | struct ieee80211_sub_if_data *prev = NULL; | |
1239 | struct sk_buff *skb_new; | |
1240 | u8 *bssid = ieee80211_get_bssid(hdr, skb->len - radiotap_len); | |
1241 | ||
1242 | read_lock(&local->sub_if_lock); | |
1243 | list_for_each_entry(sdata, &local->sub_if_list, list) { | |
1244 | rx.u.rx.ra_match = 1; | |
1245 | switch (sdata->type) { | |
1246 | case IEEE80211_IF_TYPE_STA: | |
1247 | if (!bssid) | |
1248 | continue; | |
1249 | if (!ieee80211_bssid_match(bssid, | |
1250 | sdata->u.sta.bssid)) { | |
1251 | if (!rx.u.rx.in_scan) | |
1252 | continue; | |
1253 | rx.u.rx.ra_match = 0; | |
1254 | } else if (!multicast && | |
1255 | compare_ether_addr(sdata->dev->dev_addr, | |
1256 | hdr->addr1) != 0) { | |
1257 | if (!sdata->promisc) | |
1258 | continue; | |
1259 | rx.u.rx.ra_match = 0; | |
1260 | } | |
1261 | break; | |
1262 | case IEEE80211_IF_TYPE_IBSS: | |
1263 | if (!bssid) | |
1264 | continue; | |
1265 | if (!ieee80211_bssid_match(bssid, | |
1266 | sdata->u.sta.bssid)) { | |
1267 | if (!rx.u.rx.in_scan) | |
1268 | continue; | |
1269 | rx.u.rx.ra_match = 0; | |
1270 | } else if (!multicast && | |
1271 | compare_ether_addr(sdata->dev->dev_addr, | |
1272 | hdr->addr1) != 0) { | |
1273 | if (!sdata->promisc) | |
1274 | continue; | |
1275 | rx.u.rx.ra_match = 0; | |
1276 | } else if (!sta) | |
1277 | sta = rx.sta = | |
1278 | ieee80211_ibss_add_sta(sdata->dev, | |
1279 | skb, bssid, | |
1280 | hdr->addr2); | |
1281 | break; | |
1282 | case IEEE80211_IF_TYPE_AP: | |
1283 | if (!bssid) { | |
1284 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1285 | hdr->addr1) != 0) | |
1286 | continue; | |
1287 | } else if (!ieee80211_bssid_match(bssid, | |
1288 | sdata->dev->dev_addr)) { | |
1289 | if (!rx.u.rx.in_scan) | |
1290 | continue; | |
1291 | rx.u.rx.ra_match = 0; | |
1292 | } | |
1293 | if (sdata->dev == local->mdev && | |
1294 | !rx.u.rx.in_scan) | |
1295 | /* do not receive anything via | |
1296 | * master device when not scanning */ | |
1297 | continue; | |
1298 | break; | |
1299 | case IEEE80211_IF_TYPE_WDS: | |
1300 | if (bssid || | |
1301 | (rx.fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) | |
1302 | continue; | |
1303 | if (compare_ether_addr(sdata->u.wds.remote_addr, | |
1304 | hdr->addr2) != 0) | |
1305 | continue; | |
1306 | break; | |
1307 | } | |
1308 | ||
1309 | if (prev) { | |
1310 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
1311 | if (!skb_new) { | |
1312 | if (net_ratelimit()) | |
1313 | printk(KERN_DEBUG "%s: failed to copy " | |
1314 | "multicast frame for %s", | |
1315 | local->mdev->name, prev->dev->name); | |
1316 | continue; | |
1317 | } | |
1318 | rx.skb = skb_new; | |
1319 | rx.dev = prev->dev; | |
1320 | rx.sdata = prev; | |
1321 | ieee80211_invoke_rx_handlers(local, | |
1322 | local->rx_handlers, | |
1323 | &rx, sta); | |
1324 | } | |
1325 | prev = sdata; | |
1326 | } | |
1327 | if (prev) { | |
1328 | rx.skb = skb; | |
1329 | rx.dev = prev->dev; | |
1330 | rx.sdata = prev; | |
1331 | ieee80211_invoke_rx_handlers(local, local->rx_handlers, | |
1332 | &rx, sta); | |
1333 | } else | |
1334 | dev_kfree_skb(skb); | |
1335 | read_unlock(&local->sub_if_lock); | |
1336 | } | |
1337 | ||
1338 | end: | |
1339 | if (sta) | |
1340 | sta_info_put(sta); | |
1341 | } | |
1342 | EXPORT_SYMBOL(__ieee80211_rx); | |
1343 | ||
1344 | /* This is a version of the rx handler that can be called from hard irq | |
1345 | * context. Post the skb on the queue and schedule the tasklet */ | |
1346 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
1347 | struct ieee80211_rx_status *status) | |
1348 | { | |
1349 | struct ieee80211_local *local = hw_to_local(hw); | |
1350 | ||
1351 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
1352 | ||
1353 | skb->dev = local->mdev; | |
1354 | /* copy status into skb->cb for use by tasklet */ | |
1355 | memcpy(skb->cb, status, sizeof(*status)); | |
1356 | skb->pkt_type = IEEE80211_RX_MSG; | |
1357 | skb_queue_tail(&local->skb_queue, skb); | |
1358 | tasklet_schedule(&local->tasklet); | |
1359 | } | |
1360 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |