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571ecf67 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
5 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/skbuff.h> | |
14 | #include <linux/netdevice.h> | |
15 | #include <linux/etherdevice.h> | |
d4e46a3d | 16 | #include <linux/rcupdate.h> |
571ecf67 JB |
17 | #include <net/mac80211.h> |
18 | #include <net/ieee80211_radiotap.h> | |
19 | ||
20 | #include "ieee80211_i.h" | |
21 | #include "ieee80211_led.h" | |
22 | #include "ieee80211_common.h" | |
23 | #include "wep.h" | |
24 | #include "wpa.h" | |
25 | #include "tkip.h" | |
26 | #include "wme.h" | |
27 | ||
28 | /* pre-rx handlers | |
29 | * | |
30 | * these don't have dev/sdata fields in the rx data | |
52865dfd JB |
31 | * The sta value should also not be used because it may |
32 | * be NULL even though a STA (in IBSS mode) will be added. | |
571ecf67 JB |
33 | */ |
34 | ||
6e0d114d JB |
35 | static ieee80211_txrx_result |
36 | ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx) | |
37 | { | |
38 | u8 *data = rx->skb->data; | |
39 | int tid; | |
40 | ||
41 | /* does the frame have a qos control field? */ | |
42 | if (WLAN_FC_IS_QOS_DATA(rx->fc)) { | |
43 | u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN; | |
44 | /* frame has qos control */ | |
45 | tid = qc[0] & QOS_CONTROL_TID_MASK; | |
46 | } else { | |
47 | if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) { | |
48 | /* Separate TID for management frames */ | |
49 | tid = NUM_RX_DATA_QUEUES - 1; | |
50 | } else { | |
51 | /* no qos control present */ | |
52 | tid = 0; /* 802.1d - Best Effort */ | |
53 | } | |
54 | } | |
52865dfd | 55 | |
6e0d114d | 56 | I802_DEBUG_INC(rx->local->wme_rx_queue[tid]); |
52865dfd JB |
57 | /* only a debug counter, sta might not be assigned properly yet */ |
58 | if (rx->sta) | |
6e0d114d | 59 | I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]); |
6e0d114d JB |
60 | |
61 | rx->u.rx.queue = tid; | |
62 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. | |
63 | * For now, set skb->priority to 0 for other cases. */ | |
64 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
65 | ||
66 | return TXRX_CONTINUE; | |
67 | } | |
68 | ||
571ecf67 JB |
69 | static ieee80211_txrx_result |
70 | ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx) | |
71 | { | |
72 | struct ieee80211_local *local = rx->local; | |
73 | struct sk_buff *skb = rx->skb; | |
74 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
75 | u32 load = 0, hdrtime; | |
76 | struct ieee80211_rate *rate; | |
77 | struct ieee80211_hw_mode *mode = local->hw.conf.mode; | |
78 | int i; | |
79 | ||
80 | /* Estimate total channel use caused by this frame */ | |
81 | ||
82 | if (unlikely(mode->num_rates < 0)) | |
83 | return TXRX_CONTINUE; | |
84 | ||
85 | rate = &mode->rates[0]; | |
86 | for (i = 0; i < mode->num_rates; i++) { | |
87 | if (mode->rates[i].val == rx->u.rx.status->rate) { | |
88 | rate = &mode->rates[i]; | |
89 | break; | |
90 | } | |
91 | } | |
92 | ||
93 | /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values, | |
94 | * 1 usec = 1/8 * (1080 / 10) = 13.5 */ | |
95 | ||
96 | if (mode->mode == MODE_IEEE80211A || | |
571ecf67 JB |
97 | (mode->mode == MODE_IEEE80211G && |
98 | rate->flags & IEEE80211_RATE_ERP)) | |
99 | hdrtime = CHAN_UTIL_HDR_SHORT; | |
100 | else | |
101 | hdrtime = CHAN_UTIL_HDR_LONG; | |
102 | ||
103 | load = hdrtime; | |
104 | if (!is_multicast_ether_addr(hdr->addr1)) | |
105 | load += hdrtime; | |
106 | ||
107 | load += skb->len * rate->rate_inv; | |
108 | ||
109 | /* Divide channel_use by 8 to avoid wrapping around the counter */ | |
110 | load >>= CHAN_UTIL_SHIFT; | |
111 | local->channel_use_raw += load; | |
571ecf67 JB |
112 | rx->u.rx.load = load; |
113 | ||
114 | return TXRX_CONTINUE; | |
115 | } | |
116 | ||
117 | ieee80211_rx_handler ieee80211_rx_pre_handlers[] = | |
118 | { | |
119 | ieee80211_rx_h_parse_qos, | |
120 | ieee80211_rx_h_load_stats, | |
121 | NULL | |
122 | }; | |
123 | ||
124 | /* rx handlers */ | |
125 | ||
126 | static ieee80211_txrx_result | |
127 | ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx) | |
128 | { | |
52865dfd JB |
129 | if (rx->sta) |
130 | rx->sta->channel_use_raw += rx->u.rx.load; | |
571ecf67 JB |
131 | rx->sdata->channel_use_raw += rx->u.rx.load; |
132 | return TXRX_CONTINUE; | |
133 | } | |
134 | ||
135 | static void | |
136 | ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb, | |
137 | struct ieee80211_rx_status *status) | |
138 | { | |
139 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
571ecf67 JB |
140 | struct ieee80211_rate *rate; |
141 | struct ieee80211_rtap_hdr { | |
142 | struct ieee80211_radiotap_header hdr; | |
143 | u8 flags; | |
144 | u8 rate; | |
145 | __le16 chan_freq; | |
146 | __le16 chan_flags; | |
147 | u8 antsignal; | |
72abd81b JB |
148 | u8 padding_for_rxflags; |
149 | __le16 rx_flags; | |
571ecf67 JB |
150 | } __attribute__ ((packed)) *rthdr; |
151 | ||
152 | skb->dev = dev; | |
153 | ||
571ecf67 JB |
154 | if (status->flag & RX_FLAG_RADIOTAP) |
155 | goto out; | |
156 | ||
157 | if (skb_headroom(skb) < sizeof(*rthdr)) { | |
158 | I802_DEBUG_INC(local->rx_expand_skb_head); | |
159 | if (pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) { | |
160 | dev_kfree_skb(skb); | |
161 | return; | |
162 | } | |
163 | } | |
164 | ||
165 | rthdr = (struct ieee80211_rtap_hdr *) skb_push(skb, sizeof(*rthdr)); | |
166 | memset(rthdr, 0, sizeof(*rthdr)); | |
167 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
168 | rthdr->hdr.it_present = | |
169 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
170 | (1 << IEEE80211_RADIOTAP_RATE) | | |
171 | (1 << IEEE80211_RADIOTAP_CHANNEL) | | |
72abd81b JB |
172 | (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL) | |
173 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
571ecf67 JB |
174 | rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ? |
175 | IEEE80211_RADIOTAP_F_FCS : 0; | |
72abd81b JB |
176 | |
177 | /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */ | |
178 | rthdr->rx_flags = 0; | |
179 | if (status->flag & | |
180 | (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
181 | rthdr->rx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS); | |
182 | ||
571ecf67 JB |
183 | rate = ieee80211_get_rate(local, status->phymode, status->rate); |
184 | if (rate) | |
185 | rthdr->rate = rate->rate / 5; | |
72abd81b | 186 | |
571ecf67 JB |
187 | rthdr->chan_freq = cpu_to_le16(status->freq); |
188 | rthdr->chan_flags = | |
189 | status->phymode == MODE_IEEE80211A ? | |
190 | cpu_to_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ) : | |
191 | cpu_to_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ); | |
192 | rthdr->antsignal = status->ssi; | |
193 | ||
194 | out: | |
68aae116 SH |
195 | dev->stats.rx_packets++; |
196 | dev->stats.rx_bytes += skb->len; | |
571ecf67 JB |
197 | |
198 | skb_set_mac_header(skb, 0); | |
199 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
200 | skb->pkt_type = PACKET_OTHERHOST; | |
201 | skb->protocol = htons(ETH_P_802_2); | |
202 | memset(skb->cb, 0, sizeof(skb->cb)); | |
203 | netif_rx(skb); | |
204 | } | |
205 | ||
206 | static ieee80211_txrx_result | |
207 | ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx) | |
208 | { | |
209 | if (rx->sdata->type == IEEE80211_IF_TYPE_MNTR) { | |
210 | ieee80211_rx_monitor(rx->dev, rx->skb, rx->u.rx.status); | |
211 | return TXRX_QUEUED; | |
212 | } | |
213 | ||
72abd81b JB |
214 | /* |
215 | * Drop frames with failed FCS/PLCP checksums here, they are only | |
216 | * relevant for monitor mode, the rest of the stack should never | |
217 | * see them. | |
218 | */ | |
219 | if (rx->u.rx.status->flag & | |
220 | (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
221 | return TXRX_DROP; | |
222 | ||
571ecf67 JB |
223 | if (rx->u.rx.status->flag & RX_FLAG_RADIOTAP) |
224 | skb_pull(rx->skb, ieee80211_get_radiotap_len(rx->skb->data)); | |
225 | ||
226 | return TXRX_CONTINUE; | |
227 | } | |
228 | ||
229 | static ieee80211_txrx_result | |
230 | ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx) | |
231 | { | |
232 | struct ieee80211_local *local = rx->local; | |
233 | struct sk_buff *skb = rx->skb; | |
234 | ||
235 | if (unlikely(local->sta_scanning != 0)) { | |
236 | ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status); | |
237 | return TXRX_QUEUED; | |
238 | } | |
239 | ||
badffb72 | 240 | if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) { |
571ecf67 JB |
241 | /* scanning finished during invoking of handlers */ |
242 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
243 | return TXRX_DROP; | |
244 | } | |
245 | ||
246 | return TXRX_CONTINUE; | |
247 | } | |
248 | ||
249 | static ieee80211_txrx_result | |
250 | ieee80211_rx_h_check(struct ieee80211_txrx_data *rx) | |
251 | { | |
252 | struct ieee80211_hdr *hdr; | |
571ecf67 JB |
253 | hdr = (struct ieee80211_hdr *) rx->skb->data; |
254 | ||
255 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
256 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
257 | if (unlikely(rx->fc & IEEE80211_FCTL_RETRY && | |
258 | rx->sta->last_seq_ctrl[rx->u.rx.queue] == | |
259 | hdr->seq_ctrl)) { | |
badffb72 | 260 | if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) { |
571ecf67 JB |
261 | rx->local->dot11FrameDuplicateCount++; |
262 | rx->sta->num_duplicates++; | |
263 | } | |
264 | return TXRX_DROP; | |
265 | } else | |
266 | rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl; | |
267 | } | |
268 | ||
269 | if ((rx->local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) && | |
270 | rx->skb->len > FCS_LEN) | |
271 | skb_trim(rx->skb, rx->skb->len - FCS_LEN); | |
272 | ||
273 | if (unlikely(rx->skb->len < 16)) { | |
274 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
275 | return TXRX_DROP; | |
276 | } | |
277 | ||
badffb72 | 278 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
571ecf67 JB |
279 | rx->skb->pkt_type = PACKET_OTHERHOST; |
280 | else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0) | |
281 | rx->skb->pkt_type = PACKET_HOST; | |
282 | else if (is_multicast_ether_addr(hdr->addr1)) { | |
283 | if (is_broadcast_ether_addr(hdr->addr1)) | |
284 | rx->skb->pkt_type = PACKET_BROADCAST; | |
285 | else | |
286 | rx->skb->pkt_type = PACKET_MULTICAST; | |
287 | } else | |
288 | rx->skb->pkt_type = PACKET_OTHERHOST; | |
289 | ||
290 | /* Drop disallowed frame classes based on STA auth/assoc state; | |
291 | * IEEE 802.11, Chap 5.5. | |
292 | * | |
293 | * 80211.o does filtering only based on association state, i.e., it | |
294 | * drops Class 3 frames from not associated stations. hostapd sends | |
295 | * deauth/disassoc frames when needed. In addition, hostapd is | |
296 | * responsible for filtering on both auth and assoc states. | |
297 | */ | |
298 | if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA || | |
299 | ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL && | |
300 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) && | |
301 | rx->sdata->type != IEEE80211_IF_TYPE_IBSS && | |
302 | (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) { | |
303 | if ((!(rx->fc & IEEE80211_FCTL_FROMDS) && | |
304 | !(rx->fc & IEEE80211_FCTL_TODS) && | |
305 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) | |
badffb72 | 306 | || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) { |
571ecf67 JB |
307 | /* Drop IBSS frames and frames for other hosts |
308 | * silently. */ | |
309 | return TXRX_DROP; | |
310 | } | |
311 | ||
312 | if (!rx->local->apdev) | |
313 | return TXRX_DROP; | |
314 | ||
315 | ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status, | |
316 | ieee80211_msg_sta_not_assoc); | |
317 | return TXRX_QUEUED; | |
318 | } | |
319 | ||
570bd537 JB |
320 | return TXRX_CONTINUE; |
321 | } | |
322 | ||
323 | ||
324 | static ieee80211_txrx_result | |
325 | ieee80211_rx_h_load_key(struct ieee80211_txrx_data *rx) | |
326 | { | |
327 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
3017b80b JB |
328 | int keyidx; |
329 | int hdrlen; | |
d4e46a3d | 330 | struct ieee80211_key *stakey = NULL; |
570bd537 | 331 | |
3017b80b JB |
332 | /* |
333 | * Key selection 101 | |
334 | * | |
335 | * There are three types of keys: | |
336 | * - GTK (group keys) | |
337 | * - PTK (pairwise keys) | |
338 | * - STK (station-to-station pairwise keys) | |
339 | * | |
340 | * When selecting a key, we have to distinguish between multicast | |
341 | * (including broadcast) and unicast frames, the latter can only | |
342 | * use PTKs and STKs while the former always use GTKs. Unless, of | |
343 | * course, actual WEP keys ("pre-RSNA") are used, then unicast | |
344 | * frames can also use key indizes like GTKs. Hence, if we don't | |
345 | * have a PTK/STK we check the key index for a WEP key. | |
346 | * | |
8dc06a1c JB |
347 | * Note that in a regular BSS, multicast frames are sent by the |
348 | * AP only, associated stations unicast the frame to the AP first | |
349 | * which then multicasts it on their behalf. | |
350 | * | |
3017b80b JB |
351 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
352 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
353 | * The spec seems to expect that one negotiates the same key with |
354 | * every station but there's no such requirement; VLANs could be | |
355 | * possible. | |
3017b80b JB |
356 | */ |
357 | ||
358 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) | |
359 | return TXRX_CONTINUE; | |
571ecf67 | 360 | |
3017b80b JB |
361 | /* |
362 | * No point in finding a key if the frame is neither | |
363 | * addressed to us nor a multicast frame. | |
364 | */ | |
badffb72 | 365 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
3017b80b JB |
366 | return TXRX_CONTINUE; |
367 | ||
d4e46a3d JB |
368 | if (rx->sta) |
369 | stakey = rcu_dereference(rx->sta->key); | |
370 | ||
371 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { | |
372 | rx->key = stakey; | |
571ecf67 | 373 | } else { |
3017b80b JB |
374 | /* |
375 | * The device doesn't give us the IV so we won't be | |
376 | * able to look up the key. That's ok though, we | |
377 | * don't need to decrypt the frame, we just won't | |
378 | * be able to keep statistics accurate. | |
379 | * Except for key threshold notifications, should | |
380 | * we somehow allow the driver to tell us which key | |
381 | * the hardware used if this flag is set? | |
382 | */ | |
7848ba7d JB |
383 | if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) && |
384 | (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED)) | |
3017b80b JB |
385 | return TXRX_CONTINUE; |
386 | ||
387 | hdrlen = ieee80211_get_hdrlen(rx->fc); | |
388 | ||
389 | if (rx->skb->len < 8 + hdrlen) | |
390 | return TXRX_DROP; /* TODO: count this? */ | |
391 | ||
392 | /* | |
393 | * no need to call ieee80211_wep_get_keyidx, | |
394 | * it verifies a bunch of things we've done already | |
395 | */ | |
396 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
397 | ||
d4e46a3d | 398 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
399 | |
400 | /* | |
401 | * RSNA-protected unicast frames should always be sent with | |
402 | * pairwise or station-to-station keys, but for WEP we allow | |
403 | * using a key index as well. | |
404 | */ | |
8f20fc24 | 405 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
406 | !is_multicast_ether_addr(hdr->addr1)) |
407 | rx->key = NULL; | |
571ecf67 JB |
408 | } |
409 | ||
3017b80b | 410 | if (rx->key) { |
571ecf67 JB |
411 | rx->key->tx_rx_count++; |
412 | if (unlikely(rx->local->key_tx_rx_threshold && | |
413 | rx->key->tx_rx_count > | |
414 | rx->local->key_tx_rx_threshold)) { | |
415 | ieee80211_key_threshold_notify(rx->dev, rx->key, | |
416 | rx->sta); | |
417 | } | |
418 | } | |
419 | ||
420 | return TXRX_CONTINUE; | |
421 | } | |
422 | ||
423 | static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta) | |
424 | { | |
425 | struct ieee80211_sub_if_data *sdata; | |
0795af57 JP |
426 | DECLARE_MAC_BUF(mac); |
427 | ||
571ecf67 JB |
428 | sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); |
429 | ||
430 | if (sdata->bss) | |
431 | atomic_inc(&sdata->bss->num_sta_ps); | |
432 | sta->flags |= WLAN_STA_PS; | |
433 | sta->pspoll = 0; | |
434 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
435 | printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n", |
436 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 JB |
437 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
438 | } | |
439 | ||
440 | static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta) | |
441 | { | |
442 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
443 | struct sk_buff *skb; | |
444 | int sent = 0; | |
445 | struct ieee80211_sub_if_data *sdata; | |
446 | struct ieee80211_tx_packet_data *pkt_data; | |
0795af57 | 447 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
448 | |
449 | sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); | |
450 | if (sdata->bss) | |
451 | atomic_dec(&sdata->bss->num_sta_ps); | |
452 | sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM); | |
453 | sta->pspoll = 0; | |
454 | if (!skb_queue_empty(&sta->ps_tx_buf)) { | |
455 | if (local->ops->set_tim) | |
456 | local->ops->set_tim(local_to_hw(local), sta->aid, 0); | |
457 | if (sdata->bss) | |
458 | bss_tim_clear(local, sdata->bss, sta->aid); | |
459 | } | |
460 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
461 | printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n", |
462 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 JB |
463 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
464 | /* Send all buffered frames to the station */ | |
465 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
466 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; | |
467 | sent++; | |
e8bf9649 | 468 | pkt_data->flags |= IEEE80211_TXPD_REQUEUE; |
571ecf67 JB |
469 | dev_queue_xmit(skb); |
470 | } | |
471 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
472 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; | |
473 | local->total_ps_buffered--; | |
474 | sent++; | |
475 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 | 476 | printk(KERN_DEBUG "%s: STA %s aid %d send PS frame " |
571ecf67 | 477 | "since STA not sleeping anymore\n", dev->name, |
0795af57 | 478 | print_mac(mac, sta->addr), sta->aid); |
571ecf67 | 479 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
e8bf9649 | 480 | pkt_data->flags |= IEEE80211_TXPD_REQUEUE; |
571ecf67 JB |
481 | dev_queue_xmit(skb); |
482 | } | |
483 | ||
484 | return sent; | |
485 | } | |
486 | ||
487 | static ieee80211_txrx_result | |
488 | ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx) | |
489 | { | |
490 | struct sta_info *sta = rx->sta; | |
491 | struct net_device *dev = rx->dev; | |
492 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
493 | ||
494 | if (!sta) | |
495 | return TXRX_CONTINUE; | |
496 | ||
497 | /* Update last_rx only for IBSS packets which are for the current | |
498 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
499 | * other STAs are using different BSSID. */ | |
500 | if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) { | |
501 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len); | |
502 | if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0) | |
503 | sta->last_rx = jiffies; | |
504 | } else | |
505 | if (!is_multicast_ether_addr(hdr->addr1) || | |
506 | rx->sdata->type == IEEE80211_IF_TYPE_STA) { | |
507 | /* Update last_rx only for unicast frames in order to prevent | |
508 | * the Probe Request frames (the only broadcast frames from a | |
509 | * STA in infrastructure mode) from keeping a connection alive. | |
510 | */ | |
511 | sta->last_rx = jiffies; | |
512 | } | |
513 | ||
badffb72 | 514 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
571ecf67 JB |
515 | return TXRX_CONTINUE; |
516 | ||
517 | sta->rx_fragments++; | |
518 | sta->rx_bytes += rx->skb->len; | |
6c55aa97 LF |
519 | sta->last_rssi = rx->u.rx.status->ssi; |
520 | sta->last_signal = rx->u.rx.status->signal; | |
521 | sta->last_noise = rx->u.rx.status->noise; | |
571ecf67 JB |
522 | |
523 | if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) { | |
524 | /* Change STA power saving mode only in the end of a frame | |
525 | * exchange sequence */ | |
526 | if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM)) | |
527 | rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta); | |
528 | else if (!(sta->flags & WLAN_STA_PS) && | |
529 | (rx->fc & IEEE80211_FCTL_PM)) | |
530 | ap_sta_ps_start(dev, sta); | |
531 | } | |
532 | ||
533 | /* Drop data::nullfunc frames silently, since they are used only to | |
534 | * control station power saving mode. */ | |
535 | if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
536 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) { | |
537 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); | |
538 | /* Update counter and free packet here to avoid counting this | |
539 | * as a dropped packed. */ | |
540 | sta->rx_packets++; | |
541 | dev_kfree_skb(rx->skb); | |
542 | return TXRX_QUEUED; | |
543 | } | |
544 | ||
545 | return TXRX_CONTINUE; | |
546 | } /* ieee80211_rx_h_sta_process */ | |
547 | ||
548 | static ieee80211_txrx_result | |
549 | ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx) | |
550 | { | |
551 | if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) || | |
552 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA || | |
8f20fc24 | 553 | !rx->key || rx->key->conf.alg != ALG_WEP || |
badffb72 | 554 | !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
571ecf67 JB |
555 | return TXRX_CONTINUE; |
556 | ||
557 | /* Check for weak IVs, if hwaccel did not remove IV from the frame */ | |
7848ba7d JB |
558 | if (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) || |
559 | !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) | |
8f20fc24 | 560 | if (ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
571ecf67 | 561 | rx->sta->wep_weak_iv_count++; |
571ecf67 JB |
562 | |
563 | return TXRX_CONTINUE; | |
564 | } | |
565 | ||
566 | static ieee80211_txrx_result | |
567 | ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx) | |
568 | { | |
8f20fc24 | 569 | if ((rx->key && rx->key->conf.alg != ALG_WEP) || |
571ecf67 JB |
570 | !(rx->fc & IEEE80211_FCTL_PROTECTED) || |
571 | ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA && | |
572 | ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || | |
573 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH))) | |
574 | return TXRX_CONTINUE; | |
575 | ||
576 | if (!rx->key) { | |
1a84f3fd JB |
577 | if (net_ratelimit()) |
578 | printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n", | |
579 | rx->dev->name); | |
571ecf67 JB |
580 | return TXRX_DROP; |
581 | } | |
582 | ||
7848ba7d | 583 | if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) { |
571ecf67 | 584 | if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) { |
1a84f3fd JB |
585 | if (net_ratelimit()) |
586 | printk(KERN_DEBUG "%s: RX WEP frame, decrypt " | |
587 | "failed\n", rx->dev->name); | |
571ecf67 JB |
588 | return TXRX_DROP; |
589 | } | |
7848ba7d | 590 | } else if (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED)) { |
571ecf67 JB |
591 | ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key); |
592 | /* remove ICV */ | |
593 | skb_trim(rx->skb, rx->skb->len - 4); | |
594 | } | |
595 | ||
596 | return TXRX_CONTINUE; | |
597 | } | |
598 | ||
599 | static inline struct ieee80211_fragment_entry * | |
600 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
601 | unsigned int frag, unsigned int seq, int rx_queue, | |
602 | struct sk_buff **skb) | |
603 | { | |
604 | struct ieee80211_fragment_entry *entry; | |
605 | int idx; | |
606 | ||
607 | idx = sdata->fragment_next; | |
608 | entry = &sdata->fragments[sdata->fragment_next++]; | |
609 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
610 | sdata->fragment_next = 0; | |
611 | ||
612 | if (!skb_queue_empty(&entry->skb_list)) { | |
613 | #ifdef CONFIG_MAC80211_DEBUG | |
614 | struct ieee80211_hdr *hdr = | |
615 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
0795af57 JP |
616 | DECLARE_MAC_BUF(mac); |
617 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
618 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " |
619 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0795af57 | 620 | "addr1=%s addr2=%s\n", |
571ecf67 JB |
621 | sdata->dev->name, idx, |
622 | jiffies - entry->first_frag_time, entry->seq, | |
0795af57 JP |
623 | entry->last_frag, print_mac(mac, hdr->addr1), |
624 | print_mac(mac2, hdr->addr2)); | |
571ecf67 JB |
625 | #endif /* CONFIG_MAC80211_DEBUG */ |
626 | __skb_queue_purge(&entry->skb_list); | |
627 | } | |
628 | ||
629 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
630 | *skb = NULL; | |
631 | entry->first_frag_time = jiffies; | |
632 | entry->seq = seq; | |
633 | entry->rx_queue = rx_queue; | |
634 | entry->last_frag = frag; | |
635 | entry->ccmp = 0; | |
636 | entry->extra_len = 0; | |
637 | ||
638 | return entry; | |
639 | } | |
640 | ||
641 | static inline struct ieee80211_fragment_entry * | |
642 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
643 | u16 fc, unsigned int frag, unsigned int seq, | |
644 | int rx_queue, struct ieee80211_hdr *hdr) | |
645 | { | |
646 | struct ieee80211_fragment_entry *entry; | |
647 | int i, idx; | |
648 | ||
649 | idx = sdata->fragment_next; | |
650 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
651 | struct ieee80211_hdr *f_hdr; | |
652 | u16 f_fc; | |
653 | ||
654 | idx--; | |
655 | if (idx < 0) | |
656 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
657 | ||
658 | entry = &sdata->fragments[idx]; | |
659 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
660 | entry->rx_queue != rx_queue || | |
661 | entry->last_frag + 1 != frag) | |
662 | continue; | |
663 | ||
664 | f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data; | |
665 | f_fc = le16_to_cpu(f_hdr->frame_control); | |
666 | ||
667 | if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) || | |
668 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || | |
669 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
670 | continue; | |
671 | ||
672 | if (entry->first_frag_time + 2 * HZ < jiffies) { | |
673 | __skb_queue_purge(&entry->skb_list); | |
674 | continue; | |
675 | } | |
676 | return entry; | |
677 | } | |
678 | ||
679 | return NULL; | |
680 | } | |
681 | ||
682 | static ieee80211_txrx_result | |
683 | ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx) | |
684 | { | |
685 | struct ieee80211_hdr *hdr; | |
686 | u16 sc; | |
687 | unsigned int frag, seq; | |
688 | struct ieee80211_fragment_entry *entry; | |
689 | struct sk_buff *skb; | |
0795af57 | 690 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
691 | |
692 | hdr = (struct ieee80211_hdr *) rx->skb->data; | |
693 | sc = le16_to_cpu(hdr->seq_ctrl); | |
694 | frag = sc & IEEE80211_SCTL_FRAG; | |
695 | ||
696 | if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) || | |
697 | (rx->skb)->len < 24 || | |
698 | is_multicast_ether_addr(hdr->addr1))) { | |
699 | /* not fragmented */ | |
700 | goto out; | |
701 | } | |
702 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
703 | ||
704 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
705 | ||
706 | if (frag == 0) { | |
707 | /* This is the first fragment of a new frame. */ | |
708 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
709 | rx->u.rx.queue, &(rx->skb)); | |
8f20fc24 | 710 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
571ecf67 JB |
711 | (rx->fc & IEEE80211_FCTL_PROTECTED)) { |
712 | /* Store CCMP PN so that we can verify that the next | |
713 | * fragment has a sequential PN value. */ | |
714 | entry->ccmp = 1; | |
715 | memcpy(entry->last_pn, | |
716 | rx->key->u.ccmp.rx_pn[rx->u.rx.queue], | |
717 | CCMP_PN_LEN); | |
718 | } | |
719 | return TXRX_QUEUED; | |
720 | } | |
721 | ||
722 | /* This is a fragment for a frame that should already be pending in | |
723 | * fragment cache. Add this fragment to the end of the pending entry. | |
724 | */ | |
725 | entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq, | |
726 | rx->u.rx.queue, hdr); | |
727 | if (!entry) { | |
728 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
729 | return TXRX_DROP; | |
730 | } | |
731 | ||
732 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
733 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
734 | if (entry->ccmp) { | |
735 | int i; | |
736 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 737 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
571ecf67 JB |
738 | return TXRX_DROP; |
739 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); | |
740 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
741 | pn[i]++; | |
742 | if (pn[i]) | |
743 | break; | |
744 | } | |
745 | rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue]; | |
746 | if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) { | |
1a84f3fd JB |
747 | if (net_ratelimit()) |
748 | printk(KERN_DEBUG "%s: defrag: CCMP PN not " | |
0795af57 | 749 | "sequential A2=%s" |
1a84f3fd JB |
750 | " PN=%02x%02x%02x%02x%02x%02x " |
751 | "(expected %02x%02x%02x%02x%02x%02x)\n", | |
0795af57 | 752 | rx->dev->name, print_mac(mac, hdr->addr2), |
1a84f3fd JB |
753 | rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], |
754 | rpn[5], pn[0], pn[1], pn[2], pn[3], | |
755 | pn[4], pn[5]); | |
571ecf67 JB |
756 | return TXRX_DROP; |
757 | } | |
758 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); | |
759 | } | |
760 | ||
761 | skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc)); | |
762 | __skb_queue_tail(&entry->skb_list, rx->skb); | |
763 | entry->last_frag = frag; | |
764 | entry->extra_len += rx->skb->len; | |
765 | if (rx->fc & IEEE80211_FCTL_MOREFRAGS) { | |
766 | rx->skb = NULL; | |
767 | return TXRX_QUEUED; | |
768 | } | |
769 | ||
770 | rx->skb = __skb_dequeue(&entry->skb_list); | |
771 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
772 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
773 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
774 | GFP_ATOMIC))) { | |
775 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
776 | __skb_queue_purge(&entry->skb_list); | |
777 | return TXRX_DROP; | |
778 | } | |
779 | } | |
780 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
781 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
782 | dev_kfree_skb(skb); | |
783 | } | |
784 | ||
785 | /* Complete frame has been reassembled - process it now */ | |
badffb72 | 786 | rx->flags |= IEEE80211_TXRXD_FRAGMENTED; |
571ecf67 JB |
787 | |
788 | out: | |
789 | if (rx->sta) | |
790 | rx->sta->rx_packets++; | |
791 | if (is_multicast_ether_addr(hdr->addr1)) | |
792 | rx->local->dot11MulticastReceivedFrameCount++; | |
793 | else | |
794 | ieee80211_led_rx(rx->local); | |
795 | return TXRX_CONTINUE; | |
796 | } | |
797 | ||
798 | static ieee80211_txrx_result | |
799 | ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx) | |
800 | { | |
801 | struct sk_buff *skb; | |
802 | int no_pending_pkts; | |
0795af57 | 803 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
804 | |
805 | if (likely(!rx->sta || | |
806 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL || | |
807 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL || | |
badffb72 | 808 | !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))) |
571ecf67 JB |
809 | return TXRX_CONTINUE; |
810 | ||
811 | skb = skb_dequeue(&rx->sta->tx_filtered); | |
812 | if (!skb) { | |
813 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
814 | if (skb) | |
815 | rx->local->total_ps_buffered--; | |
816 | } | |
817 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
818 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
819 | ||
820 | if (skb) { | |
821 | struct ieee80211_hdr *hdr = | |
822 | (struct ieee80211_hdr *) skb->data; | |
823 | ||
824 | /* tell TX path to send one frame even though the STA may | |
825 | * still remain is PS mode after this frame exchange */ | |
826 | rx->sta->pspoll = 1; | |
827 | ||
828 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
829 | printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n", |
830 | print_mac(mac, rx->sta->addr), rx->sta->aid, | |
571ecf67 JB |
831 | skb_queue_len(&rx->sta->ps_tx_buf)); |
832 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
833 | ||
834 | /* Use MoreData flag to indicate whether there are more | |
835 | * buffered frames for this STA */ | |
836 | if (no_pending_pkts) { | |
837 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); | |
838 | rx->sta->flags &= ~WLAN_STA_TIM; | |
839 | } else | |
840 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
841 | ||
842 | dev_queue_xmit(skb); | |
843 | ||
844 | if (no_pending_pkts) { | |
845 | if (rx->local->ops->set_tim) | |
846 | rx->local->ops->set_tim(local_to_hw(rx->local), | |
847 | rx->sta->aid, 0); | |
848 | if (rx->sdata->bss) | |
849 | bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid); | |
850 | } | |
851 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
852 | } else if (!rx->u.rx.sent_ps_buffered) { | |
0795af57 | 853 | printk(KERN_DEBUG "%s: STA %s sent PS Poll even " |
571ecf67 | 854 | "though there is no buffered frames for it\n", |
0795af57 | 855 | rx->dev->name, print_mac(mac, rx->sta->addr)); |
571ecf67 JB |
856 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
857 | ||
858 | } | |
859 | ||
860 | /* Free PS Poll skb here instead of returning TXRX_DROP that would | |
861 | * count as an dropped frame. */ | |
862 | dev_kfree_skb(rx->skb); | |
863 | ||
864 | return TXRX_QUEUED; | |
865 | } | |
866 | ||
6e0d114d JB |
867 | static ieee80211_txrx_result |
868 | ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx) | |
869 | { | |
870 | u16 fc = rx->fc; | |
871 | u8 *data = rx->skb->data; | |
872 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data; | |
873 | ||
874 | if (!WLAN_FC_IS_QOS_DATA(fc)) | |
875 | return TXRX_CONTINUE; | |
876 | ||
877 | /* remove the qos control field, update frame type and meta-data */ | |
878 | memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2); | |
879 | hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2); | |
880 | /* change frame type to non QOS */ | |
881 | rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA; | |
882 | hdr->frame_control = cpu_to_le16(fc); | |
883 | ||
884 | return TXRX_CONTINUE; | |
885 | } | |
886 | ||
571ecf67 JB |
887 | static ieee80211_txrx_result |
888 | ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx) | |
889 | { | |
890 | if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) && | |
badffb72 JS |
891 | rx->sdata->type != IEEE80211_IF_TYPE_STA && |
892 | (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) { | |
571ecf67 JB |
893 | /* Pass both encrypted and unencrypted EAPOL frames to user |
894 | * space for processing. */ | |
895 | if (!rx->local->apdev) | |
896 | return TXRX_DROP; | |
897 | ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status, | |
898 | ieee80211_msg_normal); | |
899 | return TXRX_QUEUED; | |
900 | } | |
901 | ||
902 | if (unlikely(rx->sdata->ieee802_1x && | |
903 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
904 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC && | |
905 | (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) && | |
906 | !ieee80211_is_eapol(rx->skb))) { | |
907 | #ifdef CONFIG_MAC80211_DEBUG | |
908 | struct ieee80211_hdr *hdr = | |
909 | (struct ieee80211_hdr *) rx->skb->data; | |
0795af57 JP |
910 | DECLARE_MAC_BUF(mac); |
911 | printk(KERN_DEBUG "%s: dropped frame from %s" | |
571ecf67 | 912 | " (unauthorized port)\n", rx->dev->name, |
0795af57 | 913 | print_mac(mac, hdr->addr2)); |
571ecf67 JB |
914 | #endif /* CONFIG_MAC80211_DEBUG */ |
915 | return TXRX_DROP; | |
916 | } | |
917 | ||
918 | return TXRX_CONTINUE; | |
919 | } | |
920 | ||
921 | static ieee80211_txrx_result | |
922 | ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx) | |
923 | { | |
3017b80b | 924 | /* |
7848ba7d JB |
925 | * Pass through unencrypted frames if the hardware has |
926 | * decrypted them already. | |
3017b80b | 927 | */ |
7848ba7d | 928 | if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED) |
571ecf67 JB |
929 | return TXRX_CONTINUE; |
930 | ||
931 | /* Drop unencrypted frames if key is set. */ | |
932 | if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) && | |
933 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
934 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC && | |
935 | (rx->key || rx->sdata->drop_unencrypted) && | |
936 | (rx->sdata->eapol == 0 || | |
937 | !ieee80211_is_eapol(rx->skb)))) { | |
1a84f3fd JB |
938 | if (net_ratelimit()) |
939 | printk(KERN_DEBUG "%s: RX non-WEP frame, but expected " | |
940 | "encryption\n", rx->dev->name); | |
571ecf67 JB |
941 | return TXRX_DROP; |
942 | } | |
943 | return TXRX_CONTINUE; | |
944 | } | |
945 | ||
946 | static ieee80211_txrx_result | |
947 | ieee80211_rx_h_data(struct ieee80211_txrx_data *rx) | |
948 | { | |
949 | struct net_device *dev = rx->dev; | |
950 | struct ieee80211_local *local = rx->local; | |
951 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
952 | u16 fc, hdrlen, ethertype; | |
953 | u8 *payload; | |
954 | u8 dst[ETH_ALEN]; | |
955 | u8 src[ETH_ALEN]; | |
956 | struct sk_buff *skb = rx->skb, *skb2; | |
957 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
0795af57 JP |
958 | DECLARE_MAC_BUF(mac); |
959 | DECLARE_MAC_BUF(mac2); | |
960 | DECLARE_MAC_BUF(mac3); | |
961 | DECLARE_MAC_BUF(mac4); | |
571ecf67 JB |
962 | |
963 | fc = rx->fc; | |
964 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
965 | return TXRX_CONTINUE; | |
966 | ||
967 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
968 | return TXRX_DROP; | |
969 | ||
970 | hdrlen = ieee80211_get_hdrlen(fc); | |
971 | ||
972 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
973 | * header | |
974 | * IEEE 802.11 address fields: | |
975 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
976 | * 0 0 DA SA BSSID n/a | |
977 | * 0 1 DA BSSID SA n/a | |
978 | * 1 0 BSSID SA DA n/a | |
979 | * 1 1 RA TA DA SA | |
980 | */ | |
981 | ||
982 | switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
983 | case IEEE80211_FCTL_TODS: | |
984 | /* BSSID SA DA */ | |
985 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
986 | memcpy(src, hdr->addr2, ETH_ALEN); | |
987 | ||
988 | if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP && | |
989 | sdata->type != IEEE80211_IF_TYPE_VLAN)) { | |
1a84f3fd JB |
990 | if (net_ratelimit()) |
991 | printk(KERN_DEBUG "%s: dropped ToDS frame " | |
0795af57 | 992 | "(BSSID=%s SA=%s DA=%s)\n", |
1a84f3fd | 993 | dev->name, |
0795af57 JP |
994 | print_mac(mac, hdr->addr1), |
995 | print_mac(mac2, hdr->addr2), | |
996 | print_mac(mac3, hdr->addr3)); | |
571ecf67 JB |
997 | return TXRX_DROP; |
998 | } | |
999 | break; | |
1000 | case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
1001 | /* RA TA DA SA */ | |
1002 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1003 | memcpy(src, hdr->addr4, ETH_ALEN); | |
1004 | ||
1005 | if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) { | |
1a84f3fd JB |
1006 | if (net_ratelimit()) |
1007 | printk(KERN_DEBUG "%s: dropped FromDS&ToDS " | |
0795af57 | 1008 | "frame (RA=%s TA=%s DA=%s SA=%s)\n", |
1a84f3fd | 1009 | rx->dev->name, |
0795af57 JP |
1010 | print_mac(mac, hdr->addr1), |
1011 | print_mac(mac2, hdr->addr2), | |
1012 | print_mac(mac3, hdr->addr3), | |
1013 | print_mac(mac4, hdr->addr4)); | |
571ecf67 JB |
1014 | return TXRX_DROP; |
1015 | } | |
1016 | break; | |
1017 | case IEEE80211_FCTL_FROMDS: | |
1018 | /* DA BSSID SA */ | |
1019 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1020 | memcpy(src, hdr->addr3, ETH_ALEN); | |
1021 | ||
b3316157 JL |
1022 | if (sdata->type != IEEE80211_IF_TYPE_STA || |
1023 | (is_multicast_ether_addr(dst) && | |
1024 | !compare_ether_addr(src, dev->dev_addr))) | |
571ecf67 | 1025 | return TXRX_DROP; |
571ecf67 JB |
1026 | break; |
1027 | case 0: | |
1028 | /* DA SA BSSID */ | |
1029 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1030 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1031 | ||
1032 | if (sdata->type != IEEE80211_IF_TYPE_IBSS) { | |
1033 | if (net_ratelimit()) { | |
0795af57 JP |
1034 | printk(KERN_DEBUG "%s: dropped IBSS frame " |
1035 | "(DA=%s SA=%s BSSID=%s)\n", | |
1036 | dev->name, | |
1037 | print_mac(mac, hdr->addr1), | |
1038 | print_mac(mac2, hdr->addr2), | |
1039 | print_mac(mac3, hdr->addr3)); | |
571ecf67 JB |
1040 | } |
1041 | return TXRX_DROP; | |
1042 | } | |
1043 | break; | |
1044 | } | |
1045 | ||
1046 | payload = skb->data + hdrlen; | |
1047 | ||
1048 | if (unlikely(skb->len - hdrlen < 8)) { | |
1049 | if (net_ratelimit()) { | |
1050 | printk(KERN_DEBUG "%s: RX too short data frame " | |
1051 | "payload\n", dev->name); | |
1052 | } | |
1053 | return TXRX_DROP; | |
1054 | } | |
1055 | ||
1056 | ethertype = (payload[6] << 8) | payload[7]; | |
1057 | ||
1058 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1059 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1060 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1061 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1062 | * replace EtherType */ | |
1063 | skb_pull(skb, hdrlen + 6); | |
1064 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1065 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1066 | } else { | |
1067 | struct ethhdr *ehdr; | |
1068 | __be16 len; | |
1069 | skb_pull(skb, hdrlen); | |
1070 | len = htons(skb->len); | |
1071 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1072 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1073 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1074 | ehdr->h_proto = len; | |
1075 | } | |
1076 | skb->dev = dev; | |
1077 | ||
1078 | skb2 = NULL; | |
1079 | ||
68aae116 SH |
1080 | dev->stats.rx_packets++; |
1081 | dev->stats.rx_bytes += skb->len; | |
571ecf67 JB |
1082 | |
1083 | if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP | |
badffb72 JS |
1084 | || sdata->type == IEEE80211_IF_TYPE_VLAN) && |
1085 | (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) { | |
571ecf67 JB |
1086 | if (is_multicast_ether_addr(skb->data)) { |
1087 | /* send multicast frames both to higher layers in | |
1088 | * local net stack and back to the wireless media */ | |
1089 | skb2 = skb_copy(skb, GFP_ATOMIC); | |
1a84f3fd | 1090 | if (!skb2 && net_ratelimit()) |
571ecf67 JB |
1091 | printk(KERN_DEBUG "%s: failed to clone " |
1092 | "multicast frame\n", dev->name); | |
1093 | } else { | |
1094 | struct sta_info *dsta; | |
1095 | dsta = sta_info_get(local, skb->data); | |
1096 | if (dsta && !dsta->dev) { | |
1a84f3fd JB |
1097 | if (net_ratelimit()) |
1098 | printk(KERN_DEBUG "Station with null " | |
1099 | "dev structure!\n"); | |
571ecf67 JB |
1100 | } else if (dsta && dsta->dev == dev) { |
1101 | /* Destination station is associated to this | |
1102 | * AP, so send the frame directly to it and | |
1103 | * do not pass the frame to local net stack. | |
1104 | */ | |
1105 | skb2 = skb; | |
1106 | skb = NULL; | |
1107 | } | |
1108 | if (dsta) | |
1109 | sta_info_put(dsta); | |
1110 | } | |
1111 | } | |
1112 | ||
1113 | if (skb) { | |
1114 | /* deliver to local stack */ | |
1115 | skb->protocol = eth_type_trans(skb, dev); | |
1116 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1117 | netif_rx(skb); | |
1118 | } | |
1119 | ||
1120 | if (skb2) { | |
1121 | /* send to wireless media */ | |
1122 | skb2->protocol = __constant_htons(ETH_P_802_3); | |
1123 | skb_set_network_header(skb2, 0); | |
1124 | skb_set_mac_header(skb2, 0); | |
1125 | dev_queue_xmit(skb2); | |
1126 | } | |
1127 | ||
1128 | return TXRX_QUEUED; | |
1129 | } | |
1130 | ||
1131 | static ieee80211_txrx_result | |
1132 | ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx) | |
1133 | { | |
1134 | struct ieee80211_sub_if_data *sdata; | |
1135 | ||
badffb72 | 1136 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
571ecf67 JB |
1137 | return TXRX_DROP; |
1138 | ||
1139 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1140 | if ((sdata->type == IEEE80211_IF_TYPE_STA || | |
1141 | sdata->type == IEEE80211_IF_TYPE_IBSS) && | |
1142 | !rx->local->user_space_mlme) { | |
1143 | ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status); | |
1144 | } else { | |
1145 | /* Management frames are sent to hostapd for processing */ | |
1146 | if (!rx->local->apdev) | |
1147 | return TXRX_DROP; | |
1148 | ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status, | |
1149 | ieee80211_msg_normal); | |
1150 | } | |
1151 | return TXRX_QUEUED; | |
1152 | } | |
1153 | ||
1154 | static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers( | |
1155 | struct ieee80211_local *local, | |
1156 | ieee80211_rx_handler *handlers, | |
1157 | struct ieee80211_txrx_data *rx, | |
1158 | struct sta_info *sta) | |
1159 | { | |
1160 | ieee80211_rx_handler *handler; | |
1161 | ieee80211_txrx_result res = TXRX_DROP; | |
1162 | ||
1163 | for (handler = handlers; *handler != NULL; handler++) { | |
1164 | res = (*handler)(rx); | |
8e6f0032 JB |
1165 | |
1166 | switch (res) { | |
1167 | case TXRX_CONTINUE: | |
1168 | continue; | |
1169 | case TXRX_DROP: | |
1170 | I802_DEBUG_INC(local->rx_handlers_drop); | |
1171 | if (sta) | |
1172 | sta->rx_dropped++; | |
1173 | break; | |
1174 | case TXRX_QUEUED: | |
1175 | I802_DEBUG_INC(local->rx_handlers_queued); | |
571ecf67 JB |
1176 | break; |
1177 | } | |
8e6f0032 | 1178 | break; |
571ecf67 JB |
1179 | } |
1180 | ||
8e6f0032 | 1181 | if (res == TXRX_DROP) |
571ecf67 | 1182 | dev_kfree_skb(rx->skb); |
571ecf67 JB |
1183 | return res; |
1184 | } | |
1185 | ||
1186 | static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local, | |
1187 | ieee80211_rx_handler *handlers, | |
1188 | struct ieee80211_txrx_data *rx, | |
1189 | struct sta_info *sta) | |
1190 | { | |
1191 | if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) == | |
1192 | TXRX_CONTINUE) | |
1193 | dev_kfree_skb(rx->skb); | |
1194 | } | |
1195 | ||
1196 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, | |
1197 | struct ieee80211_hdr *hdr, | |
1198 | struct sta_info *sta, | |
1199 | struct ieee80211_txrx_data *rx) | |
1200 | { | |
1201 | int keyidx, hdrlen; | |
0795af57 JP |
1202 | DECLARE_MAC_BUF(mac); |
1203 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
1204 | |
1205 | hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb); | |
1206 | if (rx->skb->len >= hdrlen + 4) | |
1207 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1208 | else | |
1209 | keyidx = -1; | |
1210 | ||
1a84f3fd JB |
1211 | if (net_ratelimit()) |
1212 | printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC " | |
0795af57 JP |
1213 | "failure from %s to %s keyidx=%d\n", |
1214 | dev->name, print_mac(mac, hdr->addr2), | |
1215 | print_mac(mac2, hdr->addr1), keyidx); | |
571ecf67 JB |
1216 | |
1217 | if (!sta) { | |
aa0daf0e JB |
1218 | /* |
1219 | * Some hardware seem to generate incorrect Michael MIC | |
1220 | * reports; ignore them to avoid triggering countermeasures. | |
1221 | */ | |
1a84f3fd JB |
1222 | if (net_ratelimit()) |
1223 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
0795af57 JP |
1224 | "error for unknown address %s\n", |
1225 | dev->name, print_mac(mac, hdr->addr2)); | |
571ecf67 JB |
1226 | goto ignore; |
1227 | } | |
1228 | ||
1229 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) { | |
1a84f3fd JB |
1230 | if (net_ratelimit()) |
1231 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
aa0daf0e | 1232 | "error for a frame with no PROTECTED flag (src " |
0795af57 | 1233 | "%s)\n", dev->name, print_mac(mac, hdr->addr2)); |
571ecf67 JB |
1234 | goto ignore; |
1235 | } | |
1236 | ||
7848ba7d | 1237 | if (rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) { |
aa0daf0e JB |
1238 | /* |
1239 | * APs with pairwise keys should never receive Michael MIC | |
1240 | * errors for non-zero keyidx because these are reserved for | |
1241 | * group keys and only the AP is sending real multicast | |
1242 | * frames in the BSS. | |
1243 | */ | |
eb063c17 JB |
1244 | if (net_ratelimit()) |
1245 | printk(KERN_DEBUG "%s: ignored Michael MIC error for " | |
1246 | "a frame with non-zero keyidx (%d)" | |
0795af57 JP |
1247 | " (src %s)\n", dev->name, keyidx, |
1248 | print_mac(mac, hdr->addr2)); | |
eb063c17 | 1249 | goto ignore; |
571ecf67 JB |
1250 | } |
1251 | ||
1252 | if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA && | |
1253 | ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || | |
1254 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) { | |
1a84f3fd JB |
1255 | if (net_ratelimit()) |
1256 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
1257 | "error for a frame that cannot be encrypted " | |
0795af57 JP |
1258 | "(fc=0x%04x) (src %s)\n", |
1259 | dev->name, rx->fc, print_mac(mac, hdr->addr2)); | |
571ecf67 JB |
1260 | goto ignore; |
1261 | } | |
1262 | ||
eb063c17 | 1263 | mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr); |
571ecf67 JB |
1264 | ignore: |
1265 | dev_kfree_skb(rx->skb); | |
1266 | rx->skb = NULL; | |
1267 | } | |
1268 | ||
1269 | ieee80211_rx_handler ieee80211_rx_handlers[] = | |
1270 | { | |
1271 | ieee80211_rx_h_if_stats, | |
1272 | ieee80211_rx_h_monitor, | |
1273 | ieee80211_rx_h_passive_scan, | |
1274 | ieee80211_rx_h_check, | |
570bd537 | 1275 | ieee80211_rx_h_load_key, |
571ecf67 JB |
1276 | ieee80211_rx_h_sta_process, |
1277 | ieee80211_rx_h_ccmp_decrypt, | |
1278 | ieee80211_rx_h_tkip_decrypt, | |
1279 | ieee80211_rx_h_wep_weak_iv_detection, | |
1280 | ieee80211_rx_h_wep_decrypt, | |
1281 | ieee80211_rx_h_defragment, | |
1282 | ieee80211_rx_h_ps_poll, | |
1283 | ieee80211_rx_h_michael_mic_verify, | |
1284 | /* this must be after decryption - so header is counted in MPDU mic | |
1285 | * must be before pae and data, so QOS_DATA format frames | |
1286 | * are not passed to user space by these functions | |
1287 | */ | |
1288 | ieee80211_rx_h_remove_qos_control, | |
1289 | ieee80211_rx_h_802_1x_pae, | |
1290 | ieee80211_rx_h_drop_unencrypted, | |
1291 | ieee80211_rx_h_data, | |
1292 | ieee80211_rx_h_mgmt, | |
1293 | NULL | |
1294 | }; | |
1295 | ||
1296 | /* main receive path */ | |
1297 | ||
23a24def JB |
1298 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
1299 | u8 *bssid, struct ieee80211_txrx_data *rx, | |
1300 | struct ieee80211_hdr *hdr) | |
1301 | { | |
1302 | int multicast = is_multicast_ether_addr(hdr->addr1); | |
1303 | ||
1304 | switch (sdata->type) { | |
1305 | case IEEE80211_IF_TYPE_STA: | |
1306 | if (!bssid) | |
1307 | return 0; | |
1308 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
badffb72 | 1309 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1310 | return 0; |
badffb72 | 1311 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1312 | } else if (!multicast && |
1313 | compare_ether_addr(sdata->dev->dev_addr, | |
1314 | hdr->addr1) != 0) { | |
13262ffd | 1315 | if (!(sdata->flags & IEEE80211_SDATA_PROMISC)) |
23a24def | 1316 | return 0; |
badffb72 | 1317 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1318 | } |
1319 | break; | |
1320 | case IEEE80211_IF_TYPE_IBSS: | |
1321 | if (!bssid) | |
1322 | return 0; | |
1323 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
badffb72 | 1324 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1325 | return 0; |
badffb72 | 1326 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1327 | } else if (!multicast && |
1328 | compare_ether_addr(sdata->dev->dev_addr, | |
1329 | hdr->addr1) != 0) { | |
13262ffd | 1330 | if (!(sdata->flags & IEEE80211_SDATA_PROMISC)) |
23a24def | 1331 | return 0; |
badffb72 | 1332 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1333 | } else if (!rx->sta) |
1334 | rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb, | |
1335 | bssid, hdr->addr2); | |
1336 | break; | |
1337 | case IEEE80211_IF_TYPE_AP: | |
1338 | if (!bssid) { | |
1339 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1340 | hdr->addr1)) | |
1341 | return 0; | |
1342 | } else if (!ieee80211_bssid_match(bssid, | |
1343 | sdata->dev->dev_addr)) { | |
badffb72 | 1344 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1345 | return 0; |
badffb72 | 1346 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def | 1347 | } |
badffb72 JS |
1348 | if (sdata->dev == sdata->local->mdev && |
1349 | !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) | |
23a24def JB |
1350 | /* do not receive anything via |
1351 | * master device when not scanning */ | |
1352 | return 0; | |
1353 | break; | |
1354 | case IEEE80211_IF_TYPE_WDS: | |
1355 | if (bssid || | |
1356 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) | |
1357 | return 0; | |
1358 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
1359 | return 0; | |
1360 | break; | |
1361 | } | |
1362 | ||
1363 | return 1; | |
1364 | } | |
1365 | ||
571ecf67 JB |
1366 | /* |
1367 | * This is the receive path handler. It is called by a low level driver when an | |
1368 | * 802.11 MPDU is received from the hardware. | |
1369 | */ | |
1370 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
1371 | struct ieee80211_rx_status *status) | |
1372 | { | |
1373 | struct ieee80211_local *local = hw_to_local(hw); | |
1374 | struct ieee80211_sub_if_data *sdata; | |
1375 | struct sta_info *sta; | |
1376 | struct ieee80211_hdr *hdr; | |
1377 | struct ieee80211_txrx_data rx; | |
1378 | u16 type; | |
23a24def | 1379 | int radiotap_len = 0, prepres; |
8e6f0032 JB |
1380 | struct ieee80211_sub_if_data *prev = NULL; |
1381 | struct sk_buff *skb_new; | |
1382 | u8 *bssid; | |
72abd81b | 1383 | int bogon; |
571ecf67 JB |
1384 | |
1385 | if (status->flag & RX_FLAG_RADIOTAP) { | |
1386 | radiotap_len = ieee80211_get_radiotap_len(skb->data); | |
1387 | skb_pull(skb, radiotap_len); | |
1388 | } | |
1389 | ||
d4e46a3d JB |
1390 | /* |
1391 | * key references are protected using RCU and this requires that | |
1392 | * we are in a read-site RCU section during receive processing | |
1393 | */ | |
1394 | rcu_read_lock(); | |
1395 | ||
571ecf67 JB |
1396 | hdr = (struct ieee80211_hdr *) skb->data; |
1397 | memset(&rx, 0, sizeof(rx)); | |
1398 | rx.skb = skb; | |
1399 | rx.local = local; | |
1400 | ||
1401 | rx.u.rx.status = status; | |
1402 | rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0; | |
1403 | type = rx.fc & IEEE80211_FCTL_FTYPE; | |
72abd81b JB |
1404 | |
1405 | bogon = status->flag & (RX_FLAG_FAILED_FCS_CRC | | |
1406 | RX_FLAG_FAILED_PLCP_CRC); | |
1407 | ||
1408 | if (!bogon && (type == IEEE80211_FTYPE_DATA || | |
1409 | type == IEEE80211_FTYPE_MGMT)) | |
571ecf67 | 1410 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 1411 | |
72abd81b | 1412 | if (!bogon && skb->len >= 16) { |
571ecf67 | 1413 | sta = rx.sta = sta_info_get(local, hdr->addr2); |
23a24def JB |
1414 | if (sta) { |
1415 | rx.dev = rx.sta->dev; | |
1416 | rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev); | |
1417 | } | |
1418 | } else | |
571ecf67 JB |
1419 | sta = rx.sta = NULL; |
1420 | ||
571ecf67 JB |
1421 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
1422 | ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx); | |
1423 | goto end; | |
1424 | } | |
1425 | ||
1426 | if (unlikely(local->sta_scanning)) | |
badffb72 | 1427 | rx.flags |= IEEE80211_TXRXD_RXIN_SCAN; |
571ecf67 JB |
1428 | |
1429 | if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx, | |
1430 | sta) != TXRX_CONTINUE) | |
1431 | goto end; | |
1432 | skb = rx.skb; | |
1433 | ||
1434 | skb_push(skb, radiotap_len); | |
c9ee23df | 1435 | if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) && |
23a24def | 1436 | !local->iff_promiscs && !is_multicast_ether_addr(hdr->addr1)) { |
badffb72 | 1437 | rx.flags |= IEEE80211_TXRXD_RXRA_MATCH; |
571ecf67 | 1438 | ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx, |
23a24def | 1439 | rx.sta); |
8e6f0032 | 1440 | sta_info_put(sta); |
d4e46a3d | 1441 | rcu_read_unlock(); |
8e6f0032 JB |
1442 | return; |
1443 | } | |
1444 | ||
1445 | bssid = ieee80211_get_bssid(hdr, skb->len - radiotap_len); | |
1446 | ||
1447 | read_lock(&local->sub_if_lock); | |
1448 | list_for_each_entry(sdata, &local->sub_if_list, list) { | |
badffb72 | 1449 | rx.flags |= IEEE80211_TXRXD_RXRA_MATCH; |
23a24def | 1450 | |
2a8a9a88 JB |
1451 | if (!netif_running(sdata->dev)) |
1452 | continue; | |
1453 | ||
23a24def JB |
1454 | prepres = prepare_for_handlers(sdata, bssid, &rx, hdr); |
1455 | /* prepare_for_handlers can change sta */ | |
1456 | sta = rx.sta; | |
1457 | ||
1458 | if (!prepres) | |
1459 | continue; | |
8e6f0032 | 1460 | |
340e11f3 JB |
1461 | /* |
1462 | * frame is destined for this interface, but if it's not | |
1463 | * also for the previous one we handle that after the | |
1464 | * loop to avoid copying the SKB once too much | |
1465 | */ | |
1466 | ||
1467 | if (!prev) { | |
1468 | prev = sdata; | |
1469 | continue; | |
8e6f0032 | 1470 | } |
340e11f3 JB |
1471 | |
1472 | /* | |
1473 | * frame was destined for the previous interface | |
1474 | * so invoke RX handlers for it | |
1475 | */ | |
1476 | ||
1477 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
1478 | if (!skb_new) { | |
1479 | if (net_ratelimit()) | |
1480 | printk(KERN_DEBUG "%s: failed to copy " | |
1481 | "multicast frame for %s", | |
1482 | local->mdev->name, prev->dev->name); | |
1483 | continue; | |
1484 | } | |
1485 | rx.skb = skb_new; | |
1486 | rx.dev = prev->dev; | |
1487 | rx.sdata = prev; | |
1488 | ieee80211_invoke_rx_handlers(local, local->rx_handlers, | |
1489 | &rx, sta); | |
8e6f0032 | 1490 | prev = sdata; |
571ecf67 | 1491 | } |
8e6f0032 JB |
1492 | if (prev) { |
1493 | rx.skb = skb; | |
1494 | rx.dev = prev->dev; | |
1495 | rx.sdata = prev; | |
1496 | ieee80211_invoke_rx_handlers(local, local->rx_handlers, | |
1497 | &rx, sta); | |
1498 | } else | |
1499 | dev_kfree_skb(skb); | |
1500 | read_unlock(&local->sub_if_lock); | |
571ecf67 | 1501 | |
8e6f0032 | 1502 | end: |
d4e46a3d JB |
1503 | rcu_read_unlock(); |
1504 | ||
571ecf67 JB |
1505 | if (sta) |
1506 | sta_info_put(sta); | |
1507 | } | |
1508 | EXPORT_SYMBOL(__ieee80211_rx); | |
1509 | ||
1510 | /* This is a version of the rx handler that can be called from hard irq | |
1511 | * context. Post the skb on the queue and schedule the tasklet */ | |
1512 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
1513 | struct ieee80211_rx_status *status) | |
1514 | { | |
1515 | struct ieee80211_local *local = hw_to_local(hw); | |
1516 | ||
1517 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
1518 | ||
1519 | skb->dev = local->mdev; | |
1520 | /* copy status into skb->cb for use by tasklet */ | |
1521 | memcpy(skb->cb, status, sizeof(*status)); | |
1522 | skb->pkt_type = IEEE80211_RX_MSG; | |
1523 | skb_queue_tail(&local->skb_queue, skb); | |
1524 | tasklet_schedule(&local->tasklet); | |
1525 | } | |
1526 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |