Commit | Line | Data |
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571ecf67 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
5 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
ab46623e | 12 | #include <linux/jiffies.h> |
571ecf67 JB |
13 | #include <linux/kernel.h> |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/etherdevice.h> | |
d4e46a3d | 17 | #include <linux/rcupdate.h> |
571ecf67 JB |
18 | #include <net/mac80211.h> |
19 | #include <net/ieee80211_radiotap.h> | |
20 | ||
21 | #include "ieee80211_i.h" | |
2c8dccc7 | 22 | #include "led.h" |
33b64eb2 | 23 | #include "mesh.h" |
571ecf67 JB |
24 | #include "wep.h" |
25 | #include "wpa.h" | |
26 | #include "tkip.h" | |
27 | #include "wme.h" | |
28 | ||
71364716 RR |
29 | u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
30 | struct tid_ampdu_rx *tid_agg_rx, | |
31 | struct sk_buff *skb, u16 mpdu_seq_num, | |
32 | int bar_req); | |
b2e7771e JB |
33 | /* |
34 | * monitor mode reception | |
35 | * | |
36 | * This function cleans up the SKB, i.e. it removes all the stuff | |
37 | * only useful for monitoring. | |
38 | */ | |
39 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
40 | struct sk_buff *skb, | |
41 | int rtap_len) | |
42 | { | |
43 | skb_pull(skb, rtap_len); | |
44 | ||
45 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { | |
46 | if (likely(skb->len > FCS_LEN)) | |
47 | skb_trim(skb, skb->len - FCS_LEN); | |
48 | else { | |
49 | /* driver bug */ | |
50 | WARN_ON(1); | |
51 | dev_kfree_skb(skb); | |
52 | skb = NULL; | |
53 | } | |
54 | } | |
55 | ||
56 | return skb; | |
57 | } | |
58 | ||
59 | static inline int should_drop_frame(struct ieee80211_rx_status *status, | |
60 | struct sk_buff *skb, | |
61 | int present_fcs_len, | |
62 | int radiotap_len) | |
63 | { | |
64 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
65 | ||
66 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
67 | return 1; | |
68 | if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len)) | |
69 | return 1; | |
98f0b0a3 RR |
70 | if (((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FTYPE)) == |
71 | cpu_to_le16(IEEE80211_FTYPE_CTL)) && | |
72 | ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE)) != | |
71364716 RR |
73 | cpu_to_le16(IEEE80211_STYPE_PSPOLL)) && |
74 | ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE)) != | |
75 | cpu_to_le16(IEEE80211_STYPE_BACK_REQ))) | |
b2e7771e JB |
76 | return 1; |
77 | return 0; | |
78 | } | |
79 | ||
601ae7f2 BR |
80 | static int |
81 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
82 | struct ieee80211_rx_status *status) | |
83 | { | |
84 | int len; | |
85 | ||
86 | /* always present fields */ | |
87 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
88 | ||
89 | if (status->flag & RX_FLAG_TSFT) | |
90 | len += 8; | |
91 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DB || | |
92 | local->hw.flags & IEEE80211_HW_SIGNAL_DBM) | |
93 | len += 1; | |
94 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) | |
95 | len += 1; | |
96 | ||
97 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
98 | len++; | |
99 | ||
100 | /* make sure radiotap starts at a naturally aligned address */ | |
101 | if (len % 8) | |
102 | len = roundup(len, 8); | |
103 | ||
104 | return len; | |
105 | } | |
106 | ||
107 | /** | |
108 | * ieee80211_add_rx_radiotap_header - add radiotap header | |
109 | * | |
110 | * add a radiotap header containing all the fields which the hardware provided. | |
111 | */ | |
112 | static void | |
113 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
114 | struct sk_buff *skb, | |
115 | struct ieee80211_rx_status *status, | |
116 | struct ieee80211_rate *rate, | |
117 | int rtap_len) | |
118 | { | |
119 | struct ieee80211_radiotap_header *rthdr; | |
120 | unsigned char *pos; | |
121 | ||
122 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
123 | memset(rthdr, 0, rtap_len); | |
124 | ||
125 | /* radiotap header, set always present flags */ | |
126 | rthdr->it_present = | |
127 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
128 | (1 << IEEE80211_RADIOTAP_RATE) | | |
129 | (1 << IEEE80211_RADIOTAP_CHANNEL) | | |
130 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
131 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
132 | rthdr->it_len = cpu_to_le16(rtap_len); | |
133 | ||
134 | pos = (unsigned char *)(rthdr+1); | |
135 | ||
136 | /* the order of the following fields is important */ | |
137 | ||
138 | /* IEEE80211_RADIOTAP_TSFT */ | |
139 | if (status->flag & RX_FLAG_TSFT) { | |
140 | *(__le64 *)pos = cpu_to_le64(status->mactime); | |
141 | rthdr->it_present |= | |
142 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
143 | pos += 8; | |
144 | } | |
145 | ||
146 | /* IEEE80211_RADIOTAP_FLAGS */ | |
147 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
148 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
149 | pos++; | |
150 | ||
151 | /* IEEE80211_RADIOTAP_RATE */ | |
152 | *pos = rate->bitrate / 5; | |
153 | pos++; | |
154 | ||
155 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
156 | *(__le16 *)pos = cpu_to_le16(status->freq); | |
157 | pos += 2; | |
158 | if (status->band == IEEE80211_BAND_5GHZ) | |
159 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
160 | IEEE80211_CHAN_5GHZ); | |
161 | else | |
162 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_DYN | | |
163 | IEEE80211_CHAN_2GHZ); | |
164 | pos += 2; | |
165 | ||
166 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
167 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
168 | *pos = status->signal; | |
169 | rthdr->it_present |= | |
170 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
171 | pos++; | |
172 | } | |
173 | ||
174 | /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ | |
175 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { | |
176 | *pos = status->noise; | |
177 | rthdr->it_present |= | |
178 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); | |
179 | pos++; | |
180 | } | |
181 | ||
182 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ | |
183 | ||
184 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
185 | *pos = status->antenna; | |
186 | pos++; | |
187 | ||
188 | /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */ | |
189 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) { | |
190 | *pos = status->signal; | |
191 | rthdr->it_present |= | |
192 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL); | |
193 | pos++; | |
194 | } | |
195 | ||
196 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ | |
197 | ||
198 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
199 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
200 | if ((pos - (unsigned char *)rthdr) & 1) | |
201 | pos++; | |
202 | /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */ | |
203 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
204 | *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS); | |
205 | pos += 2; | |
206 | } | |
207 | ||
b2e7771e JB |
208 | /* |
209 | * This function copies a received frame to all monitor interfaces and | |
210 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
211 | * radiotap header the driver might have added. | |
212 | */ | |
213 | static struct sk_buff * | |
214 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a JB |
215 | struct ieee80211_rx_status *status, |
216 | struct ieee80211_rate *rate) | |
b2e7771e JB |
217 | { |
218 | struct ieee80211_sub_if_data *sdata; | |
b2e7771e | 219 | int needed_headroom = 0; |
b2e7771e JB |
220 | struct sk_buff *skb, *skb2; |
221 | struct net_device *prev_dev = NULL; | |
222 | int present_fcs_len = 0; | |
223 | int rtap_len = 0; | |
224 | ||
225 | /* | |
226 | * First, we may need to make a copy of the skb because | |
227 | * (1) we need to modify it for radiotap (if not present), and | |
228 | * (2) the other RX handlers will modify the skb we got. | |
229 | * | |
230 | * We don't need to, of course, if we aren't going to return | |
231 | * the SKB because it has a bad FCS/PLCP checksum. | |
232 | */ | |
233 | if (status->flag & RX_FLAG_RADIOTAP) | |
234 | rtap_len = ieee80211_get_radiotap_len(origskb->data); | |
235 | else | |
601ae7f2 BR |
236 | /* room for the radiotap header based on driver features */ |
237 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
238 | |
239 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
240 | present_fcs_len = FCS_LEN; | |
241 | ||
242 | if (!local->monitors) { | |
243 | if (should_drop_frame(status, origskb, present_fcs_len, | |
244 | rtap_len)) { | |
245 | dev_kfree_skb(origskb); | |
246 | return NULL; | |
247 | } | |
248 | ||
249 | return remove_monitor_info(local, origskb, rtap_len); | |
250 | } | |
251 | ||
252 | if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) { | |
253 | /* only need to expand headroom if necessary */ | |
254 | skb = origskb; | |
255 | origskb = NULL; | |
256 | ||
257 | /* | |
258 | * This shouldn't trigger often because most devices have an | |
259 | * RX header they pull before we get here, and that should | |
260 | * be big enough for our radiotap information. We should | |
261 | * probably export the length to drivers so that we can have | |
262 | * them allocate enough headroom to start with. | |
263 | */ | |
264 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 265 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
266 | dev_kfree_skb(skb); |
267 | return NULL; | |
268 | } | |
269 | } else { | |
270 | /* | |
271 | * Need to make a copy and possibly remove radiotap header | |
272 | * and FCS from the original. | |
273 | */ | |
274 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
275 | ||
276 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
277 | ||
278 | if (!skb) | |
279 | return origskb; | |
280 | } | |
281 | ||
282 | /* if necessary, prepend radiotap information */ | |
601ae7f2 BR |
283 | if (!(status->flag & RX_FLAG_RADIOTAP)) |
284 | ieee80211_add_rx_radiotap_header(local, skb, status, rate, | |
285 | needed_headroom); | |
b2e7771e | 286 | |
ce3edf6d | 287 | skb_reset_mac_header(skb); |
b2e7771e JB |
288 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
289 | skb->pkt_type = PACKET_OTHERHOST; | |
290 | skb->protocol = htons(ETH_P_802_2); | |
291 | ||
292 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
293 | if (!netif_running(sdata->dev)) | |
294 | continue; | |
295 | ||
51fb61e7 | 296 | if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR) |
b2e7771e JB |
297 | continue; |
298 | ||
3d30d949 MW |
299 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
300 | continue; | |
301 | ||
b2e7771e JB |
302 | if (prev_dev) { |
303 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
304 | if (skb2) { | |
305 | skb2->dev = prev_dev; | |
306 | netif_rx(skb2); | |
307 | } | |
308 | } | |
309 | ||
310 | prev_dev = sdata->dev; | |
311 | sdata->dev->stats.rx_packets++; | |
312 | sdata->dev->stats.rx_bytes += skb->len; | |
313 | } | |
314 | ||
315 | if (prev_dev) { | |
316 | skb->dev = prev_dev; | |
317 | netif_rx(skb); | |
318 | } else | |
319 | dev_kfree_skb(skb); | |
320 | ||
321 | return origskb; | |
322 | } | |
323 | ||
324 | ||
5cf121c3 | 325 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d JB |
326 | { |
327 | u8 *data = rx->skb->data; | |
328 | int tid; | |
329 | ||
330 | /* does the frame have a qos control field? */ | |
331 | if (WLAN_FC_IS_QOS_DATA(rx->fc)) { | |
332 | u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN; | |
333 | /* frame has qos control */ | |
334 | tid = qc[0] & QOS_CONTROL_TID_MASK; | |
fd4c7f2f | 335 | if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) |
5cf121c3 | 336 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 337 | else |
5cf121c3 | 338 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d JB |
339 | } else { |
340 | if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) { | |
341 | /* Separate TID for management frames */ | |
342 | tid = NUM_RX_DATA_QUEUES - 1; | |
343 | } else { | |
344 | /* no qos control present */ | |
345 | tid = 0; /* 802.1d - Best Effort */ | |
346 | } | |
347 | } | |
52865dfd | 348 | |
5cf121c3 | 349 | rx->queue = tid; |
6e0d114d JB |
350 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
351 | * For now, set skb->priority to 0 for other cases. */ | |
352 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 353 | } |
6e0d114d | 354 | |
5cf121c3 | 355 | static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx) |
38f3714d JB |
356 | { |
357 | #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT | |
358 | int hdrlen; | |
359 | ||
360 | if (!WLAN_FC_DATA_PRESENT(rx->fc)) | |
361 | return; | |
362 | ||
363 | /* | |
364 | * Drivers are required to align the payload data in a way that | |
365 | * guarantees that the contained IP header is aligned to a four- | |
366 | * byte boundary. In the case of regular frames, this simply means | |
367 | * aligning the payload to a four-byte boundary (because either | |
368 | * the IP header is directly contained, or IV/RFC1042 headers that | |
369 | * have a length divisible by four are in front of it. | |
370 | * | |
371 | * With A-MSDU frames, however, the payload data address must | |
372 | * yield two modulo four because there are 14-byte 802.3 headers | |
373 | * within the A-MSDU frames that push the IP header further back | |
374 | * to a multiple of four again. Thankfully, the specs were sane | |
375 | * enough this time around to require padding each A-MSDU subframe | |
376 | * to a length that is a multiple of four. | |
377 | * | |
378 | * Padding like atheros hardware adds which is inbetween the 802.11 | |
379 | * header and the payload is not supported, the driver is required | |
380 | * to move the 802.11 header further back in that case. | |
381 | */ | |
382 | hdrlen = ieee80211_get_hdrlen(rx->fc); | |
5cf121c3 | 383 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d JB |
384 | hdrlen += ETH_HLEN; |
385 | WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3); | |
386 | #endif | |
6e0d114d JB |
387 | } |
388 | ||
6368e4b1 | 389 | |
71ebb4aa | 390 | static u32 ieee80211_rx_load_stats(struct ieee80211_local *local, |
8318d78a JB |
391 | struct sk_buff *skb, |
392 | struct ieee80211_rx_status *status, | |
393 | struct ieee80211_rate *rate) | |
571ecf67 | 394 | { |
571ecf67 JB |
395 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
396 | u32 load = 0, hdrtime; | |
571ecf67 JB |
397 | |
398 | /* Estimate total channel use caused by this frame */ | |
399 | ||
571ecf67 JB |
400 | /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values, |
401 | * 1 usec = 1/8 * (1080 / 10) = 13.5 */ | |
402 | ||
8318d78a JB |
403 | if (status->band == IEEE80211_BAND_5GHZ || |
404 | (status->band == IEEE80211_BAND_5GHZ && | |
405 | rate->flags & IEEE80211_RATE_ERP_G)) | |
571ecf67 JB |
406 | hdrtime = CHAN_UTIL_HDR_SHORT; |
407 | else | |
408 | hdrtime = CHAN_UTIL_HDR_LONG; | |
409 | ||
410 | load = hdrtime; | |
411 | if (!is_multicast_ether_addr(hdr->addr1)) | |
412 | load += hdrtime; | |
413 | ||
8318d78a JB |
414 | /* TODO: optimise again */ |
415 | load += skb->len * CHAN_UTIL_RATE_LCM / rate->bitrate; | |
571ecf67 JB |
416 | |
417 | /* Divide channel_use by 8 to avoid wrapping around the counter */ | |
418 | load >>= CHAN_UTIL_SHIFT; | |
571ecf67 | 419 | |
6368e4b1 | 420 | return load; |
571ecf67 JB |
421 | } |
422 | ||
571ecf67 JB |
423 | /* rx handlers */ |
424 | ||
9ae54c84 | 425 | static ieee80211_rx_result |
5cf121c3 | 426 | ieee80211_rx_h_if_stats(struct ieee80211_rx_data *rx) |
571ecf67 | 427 | { |
52865dfd | 428 | if (rx->sta) |
5cf121c3 JB |
429 | rx->sta->channel_use_raw += rx->load; |
430 | rx->sdata->channel_use_raw += rx->load; | |
9ae54c84 | 431 | return RX_CONTINUE; |
571ecf67 JB |
432 | } |
433 | ||
9ae54c84 | 434 | static ieee80211_rx_result |
5cf121c3 | 435 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
436 | { |
437 | struct ieee80211_local *local = rx->local; | |
438 | struct sk_buff *skb = rx->skb; | |
439 | ||
ece8eddd | 440 | if (unlikely(local->sta_hw_scanning)) |
5cf121c3 | 441 | return ieee80211_sta_rx_scan(rx->dev, skb, rx->status); |
ece8eddd ZY |
442 | |
443 | if (unlikely(local->sta_sw_scanning)) { | |
444 | /* drop all the other packets during a software scan anyway */ | |
5cf121c3 | 445 | if (ieee80211_sta_rx_scan(rx->dev, skb, rx->status) |
9ae54c84 | 446 | != RX_QUEUED) |
ece8eddd | 447 | dev_kfree_skb(skb); |
9ae54c84 | 448 | return RX_QUEUED; |
571ecf67 JB |
449 | } |
450 | ||
5cf121c3 | 451 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
452 | /* scanning finished during invoking of handlers */ |
453 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 454 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
455 | } |
456 | ||
9ae54c84 | 457 | return RX_CONTINUE; |
571ecf67 JB |
458 | } |
459 | ||
33b64eb2 | 460 | static ieee80211_rx_result |
5cf121c3 | 461 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 LCC |
462 | { |
463 | int hdrlen = ieee80211_get_hdrlen(rx->fc); | |
464 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
d6d1a5a7 JB |
465 | |
466 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
467 | ||
33b64eb2 LCC |
468 | if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) { |
469 | if (!((rx->fc & IEEE80211_FCTL_FROMDS) && | |
470 | (rx->fc & IEEE80211_FCTL_TODS))) | |
471 | return RX_DROP_MONITOR; | |
472 | if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0) | |
473 | return RX_DROP_MONITOR; | |
474 | } | |
475 | ||
476 | /* If there is not an established peer link and this is not a peer link | |
477 | * establisment frame, beacon or probe, drop the frame. | |
478 | */ | |
479 | ||
b4e08ea1 | 480 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 481 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 482 | |
33b64eb2 LCC |
483 | if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT) |
484 | return RX_DROP_MONITOR; | |
485 | ||
486 | switch (rx->fc & IEEE80211_FCTL_STYPE) { | |
487 | case IEEE80211_STYPE_ACTION: | |
488 | mgmt = (struct ieee80211_mgmt *)hdr; | |
489 | if (mgmt->u.action.category != PLINK_CATEGORY) | |
490 | return RX_DROP_MONITOR; | |
491 | /* fall through on else */ | |
492 | case IEEE80211_STYPE_PROBE_REQ: | |
493 | case IEEE80211_STYPE_PROBE_RESP: | |
494 | case IEEE80211_STYPE_BEACON: | |
495 | return RX_CONTINUE; | |
496 | break; | |
497 | default: | |
498 | return RX_DROP_MONITOR; | |
499 | } | |
500 | ||
501 | } else if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
966a5428 | 502 | is_multicast_ether_addr(hdr->addr1) && |
33b64eb2 LCC |
503 | mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->dev)) |
504 | return RX_DROP_MONITOR; | |
902acc78 | 505 | #undef msh_h_get |
d6d1a5a7 | 506 | |
902acc78 JB |
507 | return RX_CONTINUE; |
508 | } | |
33b64eb2 LCC |
509 | |
510 | ||
9ae54c84 | 511 | static ieee80211_rx_result |
5cf121c3 | 512 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 JB |
513 | { |
514 | struct ieee80211_hdr *hdr; | |
33b64eb2 | 515 | |
571ecf67 JB |
516 | hdr = (struct ieee80211_hdr *) rx->skb->data; |
517 | ||
518 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
519 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
520 | if (unlikely(rx->fc & IEEE80211_FCTL_RETRY && | |
5cf121c3 | 521 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 522 | hdr->seq_ctrl)) { |
5cf121c3 | 523 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
524 | rx->local->dot11FrameDuplicateCount++; |
525 | rx->sta->num_duplicates++; | |
526 | } | |
e4c26add | 527 | return RX_DROP_MONITOR; |
571ecf67 | 528 | } else |
5cf121c3 | 529 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
530 | } |
531 | ||
571ecf67 JB |
532 | if (unlikely(rx->skb->len < 16)) { |
533 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 534 | return RX_DROP_MONITOR; |
571ecf67 JB |
535 | } |
536 | ||
571ecf67 JB |
537 | /* Drop disallowed frame classes based on STA auth/assoc state; |
538 | * IEEE 802.11, Chap 5.5. | |
539 | * | |
540 | * 80211.o does filtering only based on association state, i.e., it | |
541 | * drops Class 3 frames from not associated stations. hostapd sends | |
542 | * deauth/disassoc frames when needed. In addition, hostapd is | |
543 | * responsible for filtering on both auth and assoc states. | |
544 | */ | |
33b64eb2 | 545 | |
902acc78 | 546 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 547 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 548 | |
571ecf67 JB |
549 | if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA || |
550 | ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL && | |
551 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) && | |
51fb61e7 | 552 | rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS && |
07346f81 | 553 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
571ecf67 JB |
554 | if ((!(rx->fc & IEEE80211_FCTL_FROMDS) && |
555 | !(rx->fc & IEEE80211_FCTL_TODS) && | |
556 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) | |
5cf121c3 | 557 | || !(rx->flags & IEEE80211_RX_RA_MATCH)) { |
571ecf67 JB |
558 | /* Drop IBSS frames and frames for other hosts |
559 | * silently. */ | |
e4c26add | 560 | return RX_DROP_MONITOR; |
571ecf67 JB |
561 | } |
562 | ||
e4c26add | 563 | return RX_DROP_MONITOR; |
571ecf67 JB |
564 | } |
565 | ||
9ae54c84 | 566 | return RX_CONTINUE; |
570bd537 JB |
567 | } |
568 | ||
569 | ||
9ae54c84 | 570 | static ieee80211_rx_result |
5cf121c3 | 571 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 JB |
572 | { |
573 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
3017b80b JB |
574 | int keyidx; |
575 | int hdrlen; | |
e4c26add | 576 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 577 | struct ieee80211_key *stakey = NULL; |
570bd537 | 578 | |
3017b80b JB |
579 | /* |
580 | * Key selection 101 | |
581 | * | |
582 | * There are three types of keys: | |
583 | * - GTK (group keys) | |
584 | * - PTK (pairwise keys) | |
585 | * - STK (station-to-station pairwise keys) | |
586 | * | |
587 | * When selecting a key, we have to distinguish between multicast | |
588 | * (including broadcast) and unicast frames, the latter can only | |
589 | * use PTKs and STKs while the former always use GTKs. Unless, of | |
590 | * course, actual WEP keys ("pre-RSNA") are used, then unicast | |
591 | * frames can also use key indizes like GTKs. Hence, if we don't | |
592 | * have a PTK/STK we check the key index for a WEP key. | |
593 | * | |
8dc06a1c JB |
594 | * Note that in a regular BSS, multicast frames are sent by the |
595 | * AP only, associated stations unicast the frame to the AP first | |
596 | * which then multicasts it on their behalf. | |
597 | * | |
3017b80b JB |
598 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
599 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
600 | * The spec seems to expect that one negotiates the same key with |
601 | * every station but there's no such requirement; VLANs could be | |
602 | * possible. | |
3017b80b JB |
603 | */ |
604 | ||
605 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) | |
9ae54c84 | 606 | return RX_CONTINUE; |
571ecf67 | 607 | |
3017b80b | 608 | /* |
1990af8d | 609 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
610 | * addressed to us nor a multicast frame. |
611 | */ | |
5cf121c3 | 612 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 613 | return RX_CONTINUE; |
3017b80b | 614 | |
d4e46a3d JB |
615 | if (rx->sta) |
616 | stakey = rcu_dereference(rx->sta->key); | |
617 | ||
618 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { | |
619 | rx->key = stakey; | |
571ecf67 | 620 | } else { |
3017b80b JB |
621 | /* |
622 | * The device doesn't give us the IV so we won't be | |
623 | * able to look up the key. That's ok though, we | |
624 | * don't need to decrypt the frame, we just won't | |
625 | * be able to keep statistics accurate. | |
626 | * Except for key threshold notifications, should | |
627 | * we somehow allow the driver to tell us which key | |
628 | * the hardware used if this flag is set? | |
629 | */ | |
5cf121c3 JB |
630 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
631 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 632 | return RX_CONTINUE; |
3017b80b JB |
633 | |
634 | hdrlen = ieee80211_get_hdrlen(rx->fc); | |
635 | ||
636 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 637 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
638 | |
639 | /* | |
640 | * no need to call ieee80211_wep_get_keyidx, | |
641 | * it verifies a bunch of things we've done already | |
642 | */ | |
643 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
644 | ||
d4e46a3d | 645 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
646 | |
647 | /* | |
648 | * RSNA-protected unicast frames should always be sent with | |
649 | * pairwise or station-to-station keys, but for WEP we allow | |
650 | * using a key index as well. | |
651 | */ | |
8f20fc24 | 652 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
653 | !is_multicast_ether_addr(hdr->addr1)) |
654 | rx->key = NULL; | |
571ecf67 JB |
655 | } |
656 | ||
3017b80b | 657 | if (rx->key) { |
571ecf67 | 658 | rx->key->tx_rx_count++; |
011bfcc4 | 659 | /* TODO: add threshold stuff again */ |
1990af8d | 660 | } else { |
7f3ad894 | 661 | #ifdef CONFIG_MAC80211_DEBUG |
70f08765 JB |
662 | if (net_ratelimit()) |
663 | printk(KERN_DEBUG "%s: RX protected frame," | |
664 | " but have no key\n", rx->dev->name); | |
7f3ad894 | 665 | #endif /* CONFIG_MAC80211_DEBUG */ |
e4c26add | 666 | return RX_DROP_MONITOR; |
70f08765 JB |
667 | } |
668 | ||
1990af8d JB |
669 | /* Check for weak IVs if possible */ |
670 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
671 | ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) && | |
5cf121c3 JB |
672 | (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
673 | !(rx->status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
674 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
675 | rx->sta->wep_weak_iv_count++; | |
676 | ||
70f08765 JB |
677 | switch (rx->key->conf.alg) { |
678 | case ALG_WEP: | |
e2f036da MN |
679 | result = ieee80211_crypto_wep_decrypt(rx); |
680 | break; | |
70f08765 | 681 | case ALG_TKIP: |
e2f036da MN |
682 | result = ieee80211_crypto_tkip_decrypt(rx); |
683 | break; | |
70f08765 | 684 | case ALG_CCMP: |
e2f036da MN |
685 | result = ieee80211_crypto_ccmp_decrypt(rx); |
686 | break; | |
70f08765 JB |
687 | } |
688 | ||
e2f036da | 689 | /* either the frame has been decrypted or will be dropped */ |
5cf121c3 | 690 | rx->status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
691 | |
692 | return result; | |
70f08765 JB |
693 | } |
694 | ||
571ecf67 JB |
695 | static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta) |
696 | { | |
697 | struct ieee80211_sub_if_data *sdata; | |
0795af57 JP |
698 | DECLARE_MAC_BUF(mac); |
699 | ||
d0709a65 | 700 | sdata = sta->sdata; |
571ecf67 JB |
701 | |
702 | if (sdata->bss) | |
703 | atomic_inc(&sdata->bss->num_sta_ps); | |
07346f81 | 704 | set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL); |
571ecf67 | 705 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0795af57 JP |
706 | printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n", |
707 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 JB |
708 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
709 | } | |
710 | ||
711 | static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta) | |
712 | { | |
713 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
714 | struct sk_buff *skb; | |
715 | int sent = 0; | |
716 | struct ieee80211_sub_if_data *sdata; | |
e039fa4a | 717 | struct ieee80211_tx_info *info; |
0795af57 | 718 | DECLARE_MAC_BUF(mac); |
571ecf67 | 719 | |
d0709a65 | 720 | sdata = sta->sdata; |
004c872e | 721 | |
571ecf67 JB |
722 | if (sdata->bss) |
723 | atomic_dec(&sdata->bss->num_sta_ps); | |
004c872e | 724 | |
07346f81 | 725 | clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL); |
004c872e JB |
726 | |
727 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
728 | sta_info_clear_tim_bit(sta); | |
729 | ||
571ecf67 | 730 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0795af57 JP |
731 | printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n", |
732 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 | 733 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 734 | |
571ecf67 JB |
735 | /* Send all buffered frames to the station */ |
736 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
e039fa4a | 737 | info = IEEE80211_SKB_CB(skb); |
571ecf67 | 738 | sent++; |
e039fa4a | 739 | info->flags |= IEEE80211_TX_CTL_REQUEUE; |
571ecf67 JB |
740 | dev_queue_xmit(skb); |
741 | } | |
742 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
e039fa4a | 743 | info = IEEE80211_SKB_CB(skb); |
571ecf67 JB |
744 | local->total_ps_buffered--; |
745 | sent++; | |
746 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 | 747 | printk(KERN_DEBUG "%s: STA %s aid %d send PS frame " |
571ecf67 | 748 | "since STA not sleeping anymore\n", dev->name, |
0795af57 | 749 | print_mac(mac, sta->addr), sta->aid); |
571ecf67 | 750 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
e039fa4a | 751 | info->flags |= IEEE80211_TX_CTL_REQUEUE; |
571ecf67 JB |
752 | dev_queue_xmit(skb); |
753 | } | |
754 | ||
755 | return sent; | |
756 | } | |
757 | ||
9ae54c84 | 758 | static ieee80211_rx_result |
5cf121c3 | 759 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
760 | { |
761 | struct sta_info *sta = rx->sta; | |
762 | struct net_device *dev = rx->dev; | |
763 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
764 | ||
765 | if (!sta) | |
9ae54c84 | 766 | return RX_CONTINUE; |
571ecf67 JB |
767 | |
768 | /* Update last_rx only for IBSS packets which are for the current | |
769 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
770 | * other STAs are using different BSSID. */ | |
51fb61e7 | 771 | if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) { |
71364716 RR |
772 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
773 | IEEE80211_IF_TYPE_IBSS); | |
571ecf67 JB |
774 | if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0) |
775 | sta->last_rx = jiffies; | |
776 | } else | |
777 | if (!is_multicast_ether_addr(hdr->addr1) || | |
51fb61e7 | 778 | rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) { |
571ecf67 JB |
779 | /* Update last_rx only for unicast frames in order to prevent |
780 | * the Probe Request frames (the only broadcast frames from a | |
781 | * STA in infrastructure mode) from keeping a connection alive. | |
33b64eb2 LCC |
782 | * Mesh beacons will update last_rx when if they are found to |
783 | * match the current local configuration when processed. | |
571ecf67 JB |
784 | */ |
785 | sta->last_rx = jiffies; | |
786 | } | |
787 | ||
5cf121c3 | 788 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 789 | return RX_CONTINUE; |
571ecf67 JB |
790 | |
791 | sta->rx_fragments++; | |
792 | sta->rx_bytes += rx->skb->len; | |
5cf121c3 | 793 | sta->last_signal = rx->status->signal; |
566bfe5a | 794 | sta->last_qual = rx->status->qual; |
5cf121c3 | 795 | sta->last_noise = rx->status->noise; |
571ecf67 JB |
796 | |
797 | if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) { | |
798 | /* Change STA power saving mode only in the end of a frame | |
799 | * exchange sequence */ | |
07346f81 JB |
800 | if (test_sta_flags(sta, WLAN_STA_PS) && |
801 | !(rx->fc & IEEE80211_FCTL_PM)) | |
5cf121c3 | 802 | rx->sent_ps_buffered += ap_sta_ps_end(dev, sta); |
07346f81 | 803 | else if (!test_sta_flags(sta, WLAN_STA_PS) && |
571ecf67 JB |
804 | (rx->fc & IEEE80211_FCTL_PM)) |
805 | ap_sta_ps_start(dev, sta); | |
806 | } | |
807 | ||
808 | /* Drop data::nullfunc frames silently, since they are used only to | |
809 | * control station power saving mode. */ | |
810 | if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
811 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) { | |
812 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); | |
813 | /* Update counter and free packet here to avoid counting this | |
814 | * as a dropped packed. */ | |
815 | sta->rx_packets++; | |
816 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 817 | return RX_QUEUED; |
571ecf67 JB |
818 | } |
819 | ||
9ae54c84 | 820 | return RX_CONTINUE; |
571ecf67 JB |
821 | } /* ieee80211_rx_h_sta_process */ |
822 | ||
571ecf67 JB |
823 | static inline struct ieee80211_fragment_entry * |
824 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
825 | unsigned int frag, unsigned int seq, int rx_queue, | |
826 | struct sk_buff **skb) | |
827 | { | |
828 | struct ieee80211_fragment_entry *entry; | |
829 | int idx; | |
830 | ||
831 | idx = sdata->fragment_next; | |
832 | entry = &sdata->fragments[sdata->fragment_next++]; | |
833 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
834 | sdata->fragment_next = 0; | |
835 | ||
836 | if (!skb_queue_empty(&entry->skb_list)) { | |
837 | #ifdef CONFIG_MAC80211_DEBUG | |
838 | struct ieee80211_hdr *hdr = | |
839 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
0795af57 JP |
840 | DECLARE_MAC_BUF(mac); |
841 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
842 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " |
843 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0795af57 | 844 | "addr1=%s addr2=%s\n", |
571ecf67 JB |
845 | sdata->dev->name, idx, |
846 | jiffies - entry->first_frag_time, entry->seq, | |
0795af57 JP |
847 | entry->last_frag, print_mac(mac, hdr->addr1), |
848 | print_mac(mac2, hdr->addr2)); | |
571ecf67 JB |
849 | #endif /* CONFIG_MAC80211_DEBUG */ |
850 | __skb_queue_purge(&entry->skb_list); | |
851 | } | |
852 | ||
853 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
854 | *skb = NULL; | |
855 | entry->first_frag_time = jiffies; | |
856 | entry->seq = seq; | |
857 | entry->rx_queue = rx_queue; | |
858 | entry->last_frag = frag; | |
859 | entry->ccmp = 0; | |
860 | entry->extra_len = 0; | |
861 | ||
862 | return entry; | |
863 | } | |
864 | ||
865 | static inline struct ieee80211_fragment_entry * | |
866 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
867 | u16 fc, unsigned int frag, unsigned int seq, | |
868 | int rx_queue, struct ieee80211_hdr *hdr) | |
869 | { | |
870 | struct ieee80211_fragment_entry *entry; | |
871 | int i, idx; | |
872 | ||
873 | idx = sdata->fragment_next; | |
874 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
875 | struct ieee80211_hdr *f_hdr; | |
876 | u16 f_fc; | |
877 | ||
878 | idx--; | |
879 | if (idx < 0) | |
880 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
881 | ||
882 | entry = &sdata->fragments[idx]; | |
883 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
884 | entry->rx_queue != rx_queue || | |
885 | entry->last_frag + 1 != frag) | |
886 | continue; | |
887 | ||
888 | f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data; | |
889 | f_fc = le16_to_cpu(f_hdr->frame_control); | |
890 | ||
891 | if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) || | |
892 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || | |
893 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
894 | continue; | |
895 | ||
ab46623e | 896 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
897 | __skb_queue_purge(&entry->skb_list); |
898 | continue; | |
899 | } | |
900 | return entry; | |
901 | } | |
902 | ||
903 | return NULL; | |
904 | } | |
905 | ||
9ae54c84 | 906 | static ieee80211_rx_result |
5cf121c3 | 907 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
908 | { |
909 | struct ieee80211_hdr *hdr; | |
910 | u16 sc; | |
911 | unsigned int frag, seq; | |
912 | struct ieee80211_fragment_entry *entry; | |
913 | struct sk_buff *skb; | |
0795af57 | 914 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
915 | |
916 | hdr = (struct ieee80211_hdr *) rx->skb->data; | |
917 | sc = le16_to_cpu(hdr->seq_ctrl); | |
918 | frag = sc & IEEE80211_SCTL_FRAG; | |
919 | ||
920 | if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) || | |
921 | (rx->skb)->len < 24 || | |
922 | is_multicast_ether_addr(hdr->addr1))) { | |
923 | /* not fragmented */ | |
924 | goto out; | |
925 | } | |
926 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
927 | ||
928 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
929 | ||
930 | if (frag == 0) { | |
931 | /* This is the first fragment of a new frame. */ | |
932 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 933 | rx->queue, &(rx->skb)); |
8f20fc24 | 934 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
571ecf67 JB |
935 | (rx->fc & IEEE80211_FCTL_PROTECTED)) { |
936 | /* Store CCMP PN so that we can verify that the next | |
937 | * fragment has a sequential PN value. */ | |
938 | entry->ccmp = 1; | |
939 | memcpy(entry->last_pn, | |
5cf121c3 | 940 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
941 | CCMP_PN_LEN); |
942 | } | |
9ae54c84 | 943 | return RX_QUEUED; |
571ecf67 JB |
944 | } |
945 | ||
946 | /* This is a fragment for a frame that should already be pending in | |
947 | * fragment cache. Add this fragment to the end of the pending entry. | |
948 | */ | |
949 | entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq, | |
5cf121c3 | 950 | rx->queue, hdr); |
571ecf67 JB |
951 | if (!entry) { |
952 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 953 | return RX_DROP_MONITOR; |
571ecf67 JB |
954 | } |
955 | ||
956 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
957 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
958 | if (entry->ccmp) { | |
959 | int i; | |
960 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 961 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 962 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
963 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
964 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
965 | pn[i]++; | |
966 | if (pn[i]) | |
967 | break; | |
968 | } | |
5cf121c3 | 969 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
571ecf67 | 970 | if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) { |
1a84f3fd JB |
971 | if (net_ratelimit()) |
972 | printk(KERN_DEBUG "%s: defrag: CCMP PN not " | |
0795af57 | 973 | "sequential A2=%s" |
1a84f3fd JB |
974 | " PN=%02x%02x%02x%02x%02x%02x " |
975 | "(expected %02x%02x%02x%02x%02x%02x)\n", | |
0795af57 | 976 | rx->dev->name, print_mac(mac, hdr->addr2), |
1a84f3fd JB |
977 | rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], |
978 | rpn[5], pn[0], pn[1], pn[2], pn[3], | |
979 | pn[4], pn[5]); | |
e4c26add | 980 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
981 | } |
982 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); | |
983 | } | |
984 | ||
985 | skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc)); | |
986 | __skb_queue_tail(&entry->skb_list, rx->skb); | |
987 | entry->last_frag = frag; | |
988 | entry->extra_len += rx->skb->len; | |
989 | if (rx->fc & IEEE80211_FCTL_MOREFRAGS) { | |
990 | rx->skb = NULL; | |
9ae54c84 | 991 | return RX_QUEUED; |
571ecf67 JB |
992 | } |
993 | ||
994 | rx->skb = __skb_dequeue(&entry->skb_list); | |
995 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
996 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
997 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
998 | GFP_ATOMIC))) { | |
999 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1000 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1001 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1002 | } |
1003 | } | |
1004 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1005 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1006 | dev_kfree_skb(skb); | |
1007 | } | |
1008 | ||
1009 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 1010 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
1011 | |
1012 | out: | |
1013 | if (rx->sta) | |
1014 | rx->sta->rx_packets++; | |
1015 | if (is_multicast_ether_addr(hdr->addr1)) | |
1016 | rx->local->dot11MulticastReceivedFrameCount++; | |
1017 | else | |
1018 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1019 | return RX_CONTINUE; |
571ecf67 JB |
1020 | } |
1021 | ||
9ae54c84 | 1022 | static ieee80211_rx_result |
5cf121c3 | 1023 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1024 | { |
98f0b0a3 | 1025 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
1026 | struct sk_buff *skb; |
1027 | int no_pending_pkts; | |
0795af57 | 1028 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
1029 | |
1030 | if (likely(!rx->sta || | |
1031 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL || | |
1032 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL || | |
5cf121c3 | 1033 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1034 | return RX_CONTINUE; |
571ecf67 | 1035 | |
51fb61e7 JB |
1036 | if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) && |
1037 | (sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) | |
e4c26add | 1038 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1039 | |
571ecf67 JB |
1040 | skb = skb_dequeue(&rx->sta->tx_filtered); |
1041 | if (!skb) { | |
1042 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
1043 | if (skb) | |
1044 | rx->local->total_ps_buffered--; | |
1045 | } | |
1046 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
1047 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
1048 | ||
1049 | if (skb) { | |
1050 | struct ieee80211_hdr *hdr = | |
1051 | (struct ieee80211_hdr *) skb->data; | |
1052 | ||
4a9a66e9 JB |
1053 | /* |
1054 | * Tell TX path to send one frame even though the STA may | |
1055 | * still remain is PS mode after this frame exchange. | |
1056 | */ | |
07346f81 | 1057 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); |
571ecf67 JB |
1058 | |
1059 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
1060 | printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n", |
1061 | print_mac(mac, rx->sta->addr), rx->sta->aid, | |
571ecf67 JB |
1062 | skb_queue_len(&rx->sta->ps_tx_buf)); |
1063 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
1064 | ||
1065 | /* Use MoreData flag to indicate whether there are more | |
1066 | * buffered frames for this STA */ | |
836341a7 | 1067 | if (no_pending_pkts) |
571ecf67 | 1068 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
836341a7 | 1069 | else |
571ecf67 JB |
1070 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
1071 | ||
1072 | dev_queue_xmit(skb); | |
1073 | ||
004c872e JB |
1074 | if (no_pending_pkts) |
1075 | sta_info_clear_tim_bit(rx->sta); | |
571ecf67 | 1076 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
5cf121c3 | 1077 | } else if (!rx->sent_ps_buffered) { |
004c872e JB |
1078 | /* |
1079 | * FIXME: This can be the result of a race condition between | |
1080 | * us expiring a frame and the station polling for it. | |
1081 | * Should we send it a null-func frame indicating we | |
1082 | * have nothing buffered for it? | |
1083 | */ | |
0795af57 | 1084 | printk(KERN_DEBUG "%s: STA %s sent PS Poll even " |
571ecf67 | 1085 | "though there is no buffered frames for it\n", |
0795af57 | 1086 | rx->dev->name, print_mac(mac, rx->sta->addr)); |
571ecf67 | 1087 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
1088 | } |
1089 | ||
9ae54c84 | 1090 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1091 | * count as an dropped frame. */ |
1092 | dev_kfree_skb(rx->skb); | |
1093 | ||
9ae54c84 | 1094 | return RX_QUEUED; |
571ecf67 JB |
1095 | } |
1096 | ||
9ae54c84 | 1097 | static ieee80211_rx_result |
5cf121c3 | 1098 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d JB |
1099 | { |
1100 | u16 fc = rx->fc; | |
1101 | u8 *data = rx->skb->data; | |
1102 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data; | |
1103 | ||
1104 | if (!WLAN_FC_IS_QOS_DATA(fc)) | |
9ae54c84 | 1105 | return RX_CONTINUE; |
6e0d114d JB |
1106 | |
1107 | /* remove the qos control field, update frame type and meta-data */ | |
1108 | memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2); | |
1109 | hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2); | |
1110 | /* change frame type to non QOS */ | |
1111 | rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA; | |
1112 | hdr->frame_control = cpu_to_le16(fc); | |
1113 | ||
9ae54c84 | 1114 | return RX_CONTINUE; |
6e0d114d JB |
1115 | } |
1116 | ||
76ee65bf | 1117 | static int |
5cf121c3 | 1118 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1119 | { |
07346f81 JB |
1120 | if (unlikely(!rx->sta || |
1121 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) { | |
571ecf67 | 1122 | #ifdef CONFIG_MAC80211_DEBUG |
238814fd JB |
1123 | if (net_ratelimit()) |
1124 | printk(KERN_DEBUG "%s: dropped frame " | |
1125 | "(unauthorized port)\n", rx->dev->name); | |
571ecf67 | 1126 | #endif /* CONFIG_MAC80211_DEBUG */ |
76ee65bf | 1127 | return -EACCES; |
571ecf67 JB |
1128 | } |
1129 | ||
76ee65bf | 1130 | return 0; |
571ecf67 JB |
1131 | } |
1132 | ||
76ee65bf | 1133 | static int |
5cf121c3 | 1134 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx) |
571ecf67 | 1135 | { |
3017b80b | 1136 | /* |
7848ba7d JB |
1137 | * Pass through unencrypted frames if the hardware has |
1138 | * decrypted them already. | |
3017b80b | 1139 | */ |
5cf121c3 | 1140 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1141 | return 0; |
571ecf67 JB |
1142 | |
1143 | /* Drop unencrypted frames if key is set. */ | |
1144 | if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) && | |
1145 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
1146 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC && | |
b3fc9c6c | 1147 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1148 | return -EACCES; |
b3fc9c6c | 1149 | |
76ee65bf | 1150 | return 0; |
571ecf67 JB |
1151 | } |
1152 | ||
76ee65bf | 1153 | static int |
5cf121c3 | 1154 | ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1155 | { |
1156 | struct net_device *dev = rx->dev; | |
571ecf67 JB |
1157 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; |
1158 | u16 fc, hdrlen, ethertype; | |
1159 | u8 *payload; | |
1160 | u8 dst[ETH_ALEN]; | |
1161 | u8 src[ETH_ALEN]; | |
76ee65bf | 1162 | struct sk_buff *skb = rx->skb; |
571ecf67 | 1163 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
0795af57 JP |
1164 | DECLARE_MAC_BUF(mac); |
1165 | DECLARE_MAC_BUF(mac2); | |
1166 | DECLARE_MAC_BUF(mac3); | |
1167 | DECLARE_MAC_BUF(mac4); | |
571ecf67 JB |
1168 | |
1169 | fc = rx->fc; | |
571ecf67 JB |
1170 | |
1171 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
76ee65bf | 1172 | return -1; |
571ecf67 JB |
1173 | |
1174 | hdrlen = ieee80211_get_hdrlen(fc); | |
1175 | ||
902acc78 | 1176 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
33b64eb2 LCC |
1177 | int meshhdrlen = ieee80211_get_mesh_hdrlen( |
1178 | (struct ieee80211s_hdr *) (skb->data + hdrlen)); | |
1179 | /* Copy on cb: | |
1180 | * - mesh header: to be used for mesh forwarding | |
1181 | * decision. It will also be used as mesh header template at | |
1182 | * tx.c:ieee80211_subif_start_xmit() if interface | |
1183 | * type is mesh and skb->pkt_type == PACKET_OTHERHOST | |
1184 | * - ta: to be used if a RERR needs to be sent. | |
1185 | */ | |
1186 | memcpy(skb->cb, skb->data + hdrlen, meshhdrlen); | |
1187 | memcpy(MESH_PREQ(skb), hdr->addr2, ETH_ALEN); | |
1188 | hdrlen += meshhdrlen; | |
1189 | } | |
33b64eb2 | 1190 | |
571ecf67 JB |
1191 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet |
1192 | * header | |
1193 | * IEEE 802.11 address fields: | |
1194 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
1195 | * 0 0 DA SA BSSID n/a | |
1196 | * 0 1 DA BSSID SA n/a | |
1197 | * 1 0 BSSID SA DA n/a | |
1198 | * 1 1 RA TA DA SA | |
1199 | */ | |
1200 | ||
1201 | switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
1202 | case IEEE80211_FCTL_TODS: | |
1203 | /* BSSID SA DA */ | |
1204 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1205 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1206 | ||
51fb61e7 JB |
1207 | if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP && |
1208 | sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) { | |
1a84f3fd JB |
1209 | if (net_ratelimit()) |
1210 | printk(KERN_DEBUG "%s: dropped ToDS frame " | |
0795af57 | 1211 | "(BSSID=%s SA=%s DA=%s)\n", |
1a84f3fd | 1212 | dev->name, |
0795af57 JP |
1213 | print_mac(mac, hdr->addr1), |
1214 | print_mac(mac2, hdr->addr2), | |
1215 | print_mac(mac3, hdr->addr3)); | |
76ee65bf | 1216 | return -1; |
571ecf67 JB |
1217 | } |
1218 | break; | |
1219 | case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
1220 | /* RA TA DA SA */ | |
1221 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1222 | memcpy(src, hdr->addr4, ETH_ALEN); | |
1223 | ||
33b64eb2 LCC |
1224 | if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS && |
1225 | sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT)) { | |
1226 | if (net_ratelimit()) | |
1227 | printk(KERN_DEBUG "%s: dropped FromDS&ToDS " | |
0795af57 | 1228 | "frame (RA=%s TA=%s DA=%s SA=%s)\n", |
1a84f3fd | 1229 | rx->dev->name, |
0795af57 JP |
1230 | print_mac(mac, hdr->addr1), |
1231 | print_mac(mac2, hdr->addr2), | |
1232 | print_mac(mac3, hdr->addr3), | |
1233 | print_mac(mac4, hdr->addr4)); | |
76ee65bf | 1234 | return -1; |
571ecf67 JB |
1235 | } |
1236 | break; | |
1237 | case IEEE80211_FCTL_FROMDS: | |
1238 | /* DA BSSID SA */ | |
1239 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1240 | memcpy(src, hdr->addr3, ETH_ALEN); | |
1241 | ||
51fb61e7 | 1242 | if (sdata->vif.type != IEEE80211_IF_TYPE_STA || |
b3316157 JL |
1243 | (is_multicast_ether_addr(dst) && |
1244 | !compare_ether_addr(src, dev->dev_addr))) | |
76ee65bf | 1245 | return -1; |
571ecf67 JB |
1246 | break; |
1247 | case 0: | |
1248 | /* DA SA BSSID */ | |
1249 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1250 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1251 | ||
51fb61e7 | 1252 | if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS) { |
571ecf67 | 1253 | if (net_ratelimit()) { |
0795af57 JP |
1254 | printk(KERN_DEBUG "%s: dropped IBSS frame " |
1255 | "(DA=%s SA=%s BSSID=%s)\n", | |
1256 | dev->name, | |
1257 | print_mac(mac, hdr->addr1), | |
1258 | print_mac(mac2, hdr->addr2), | |
1259 | print_mac(mac3, hdr->addr3)); | |
571ecf67 | 1260 | } |
76ee65bf | 1261 | return -1; |
571ecf67 JB |
1262 | } |
1263 | break; | |
1264 | } | |
1265 | ||
571ecf67 JB |
1266 | if (unlikely(skb->len - hdrlen < 8)) { |
1267 | if (net_ratelimit()) { | |
1268 | printk(KERN_DEBUG "%s: RX too short data frame " | |
1269 | "payload\n", dev->name); | |
1270 | } | |
76ee65bf | 1271 | return -1; |
571ecf67 JB |
1272 | } |
1273 | ||
76ee65bf | 1274 | payload = skb->data + hdrlen; |
571ecf67 JB |
1275 | ethertype = (payload[6] << 8) | payload[7]; |
1276 | ||
1277 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1278 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1279 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1280 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1281 | * replace EtherType */ | |
1282 | skb_pull(skb, hdrlen + 6); | |
1283 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1284 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1285 | } else { | |
1286 | struct ethhdr *ehdr; | |
1287 | __be16 len; | |
ce3edf6d | 1288 | |
571ecf67 JB |
1289 | skb_pull(skb, hdrlen); |
1290 | len = htons(skb->len); | |
1291 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1292 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1293 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1294 | ehdr->h_proto = len; | |
1295 | } | |
76ee65bf RR |
1296 | return 0; |
1297 | } | |
571ecf67 | 1298 | |
ce3edf6d JB |
1299 | /* |
1300 | * requires that rx->skb is a frame with ethernet header | |
1301 | */ | |
5cf121c3 | 1302 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx) |
ce3edf6d JB |
1303 | { |
1304 | static const u8 pae_group_addr[ETH_ALEN] | |
1305 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; | |
1306 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1307 | ||
1308 | /* | |
1309 | * Allow EAPOL frames to us/the PAE group address regardless | |
1310 | * of whether the frame was encrypted or not. | |
1311 | */ | |
1312 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1313 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1314 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1315 | return true; | |
1316 | ||
1317 | if (ieee80211_802_1x_port_control(rx) || | |
1318 | ieee80211_drop_unencrypted(rx)) | |
1319 | return false; | |
1320 | ||
1321 | return true; | |
1322 | } | |
1323 | ||
1324 | /* | |
1325 | * requires that rx->skb is a frame with ethernet header | |
1326 | */ | |
76ee65bf | 1327 | static void |
5cf121c3 | 1328 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1329 | { |
1330 | struct net_device *dev = rx->dev; | |
1331 | struct ieee80211_local *local = rx->local; | |
1332 | struct sk_buff *skb, *xmit_skb; | |
1333 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1334 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1335 | struct sta_info *dsta; | |
571ecf67 | 1336 | |
76ee65bf RR |
1337 | skb = rx->skb; |
1338 | xmit_skb = NULL; | |
571ecf67 | 1339 | |
51fb61e7 JB |
1340 | if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP || |
1341 | sdata->vif.type == IEEE80211_IF_TYPE_VLAN) && | |
5cf121c3 | 1342 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
ce3edf6d JB |
1343 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1344 | /* | |
1345 | * send multicast frames both to higher layers in | |
1346 | * local net stack and back to the wireless medium | |
1347 | */ | |
76ee65bf RR |
1348 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1349 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1350 | printk(KERN_DEBUG "%s: failed to clone " |
1351 | "multicast frame\n", dev->name); | |
1352 | } else { | |
571ecf67 | 1353 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1354 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1355 | /* |
1356 | * The destination station is associated to | |
1357 | * this AP (in this VLAN), so send the frame | |
1358 | * directly to it and do not pass it to local | |
1359 | * net stack. | |
571ecf67 | 1360 | */ |
76ee65bf | 1361 | xmit_skb = skb; |
571ecf67 JB |
1362 | skb = NULL; |
1363 | } | |
571ecf67 JB |
1364 | } |
1365 | } | |
1366 | ||
33b64eb2 | 1367 | /* Mesh forwarding */ |
902acc78 | 1368 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
33b64eb2 LCC |
1369 | u8 *mesh_ttl = &((struct ieee80211s_hdr *)skb->cb)->ttl; |
1370 | (*mesh_ttl)--; | |
1371 | ||
1372 | if (is_multicast_ether_addr(skb->data)) { | |
1373 | if (*mesh_ttl > 0) { | |
1374 | xmit_skb = skb_copy(skb, GFP_ATOMIC); | |
69687a0b LCC |
1375 | if (xmit_skb) |
1376 | xmit_skb->pkt_type = PACKET_OTHERHOST; | |
1377 | else if (net_ratelimit()) | |
33b64eb2 LCC |
1378 | printk(KERN_DEBUG "%s: failed to clone " |
1379 | "multicast frame\n", dev->name); | |
33b64eb2 | 1380 | } else |
902acc78 JB |
1381 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta, |
1382 | dropped_frames_ttl); | |
33b64eb2 LCC |
1383 | } else if (skb->pkt_type != PACKET_OTHERHOST && |
1384 | compare_ether_addr(dev->dev_addr, skb->data) != 0) { | |
1385 | if (*mesh_ttl == 0) { | |
902acc78 JB |
1386 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta, |
1387 | dropped_frames_ttl); | |
33b64eb2 LCC |
1388 | dev_kfree_skb(skb); |
1389 | skb = NULL; | |
1390 | } else { | |
1391 | xmit_skb = skb; | |
1392 | xmit_skb->pkt_type = PACKET_OTHERHOST; | |
1393 | if (!(dev->flags & IFF_PROMISC)) | |
1394 | skb = NULL; | |
1395 | } | |
1396 | } | |
1397 | } | |
33b64eb2 | 1398 | |
571ecf67 JB |
1399 | if (skb) { |
1400 | /* deliver to local stack */ | |
1401 | skb->protocol = eth_type_trans(skb, dev); | |
1402 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1403 | netif_rx(skb); | |
1404 | } | |
1405 | ||
76ee65bf | 1406 | if (xmit_skb) { |
571ecf67 | 1407 | /* send to wireless media */ |
f831e909 | 1408 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1409 | skb_reset_network_header(xmit_skb); |
1410 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1411 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1412 | } |
76ee65bf RR |
1413 | } |
1414 | ||
9ae54c84 | 1415 | static ieee80211_rx_result |
5cf121c3 | 1416 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f RR |
1417 | { |
1418 | struct net_device *dev = rx->dev; | |
1419 | struct ieee80211_local *local = rx->local; | |
1420 | u16 fc, ethertype; | |
1421 | u8 *payload; | |
1422 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
1423 | const struct ethhdr *eth; | |
1424 | int remaining, err; | |
1425 | u8 dst[ETH_ALEN]; | |
1426 | u8 src[ETH_ALEN]; | |
1427 | DECLARE_MAC_BUF(mac); | |
1428 | ||
1429 | fc = rx->fc; | |
1430 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
9ae54c84 | 1431 | return RX_CONTINUE; |
fd4c7f2f RR |
1432 | |
1433 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
e4c26add | 1434 | return RX_DROP_MONITOR; |
fd4c7f2f | 1435 | |
5cf121c3 | 1436 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1437 | return RX_CONTINUE; |
fd4c7f2f RR |
1438 | |
1439 | err = ieee80211_data_to_8023(rx); | |
1440 | if (unlikely(err)) | |
e4c26add | 1441 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1442 | |
1443 | skb->dev = dev; | |
1444 | ||
1445 | dev->stats.rx_packets++; | |
1446 | dev->stats.rx_bytes += skb->len; | |
1447 | ||
1448 | /* skip the wrapping header */ | |
1449 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1450 | if (!eth) | |
e4c26add | 1451 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1452 | |
1453 | while (skb != frame) { | |
1454 | u8 padding; | |
1455 | __be16 len = eth->h_proto; | |
1456 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1457 | ||
1458 | remaining = skb->len; | |
1459 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1460 | memcpy(src, eth->h_source, ETH_ALEN); | |
1461 | ||
1462 | padding = ((4 - subframe_len) & 0x3); | |
1463 | /* the last MSDU has no padding */ | |
1464 | if (subframe_len > remaining) { | |
a4278e18 | 1465 | printk(KERN_DEBUG "%s: wrong buffer size\n", dev->name); |
e4c26add | 1466 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1467 | } |
1468 | ||
1469 | skb_pull(skb, sizeof(struct ethhdr)); | |
1470 | /* if last subframe reuse skb */ | |
1471 | if (remaining <= subframe_len + padding) | |
1472 | frame = skb; | |
1473 | else { | |
1474 | frame = dev_alloc_skb(local->hw.extra_tx_headroom + | |
1475 | subframe_len); | |
1476 | ||
1477 | if (frame == NULL) | |
e4c26add | 1478 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1479 | |
1480 | skb_reserve(frame, local->hw.extra_tx_headroom + | |
1481 | sizeof(struct ethhdr)); | |
1482 | memcpy(skb_put(frame, ntohs(len)), skb->data, | |
1483 | ntohs(len)); | |
1484 | ||
1485 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1486 | padding); | |
1487 | if (!eth) { | |
a4278e18 | 1488 | printk(KERN_DEBUG "%s: wrong buffer size\n", |
fd4c7f2f RR |
1489 | dev->name); |
1490 | dev_kfree_skb(frame); | |
e4c26add | 1491 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1492 | } |
1493 | } | |
1494 | ||
ce3edf6d | 1495 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1496 | frame->dev = dev; |
1497 | frame->priority = skb->priority; | |
1498 | rx->skb = frame; | |
1499 | ||
fd4c7f2f RR |
1500 | payload = frame->data; |
1501 | ethertype = (payload[6] << 8) | payload[7]; | |
1502 | ||
1503 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1504 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1505 | compare_ether_addr(payload, | |
1506 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1507 | /* remove RFC1042 or Bridge-Tunnel |
1508 | * encapsulation and replace EtherType */ | |
1509 | skb_pull(frame, 6); | |
1510 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1511 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1512 | } else { | |
ce3edf6d JB |
1513 | memcpy(skb_push(frame, sizeof(__be16)), |
1514 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1515 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1516 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1517 | } | |
1518 | ||
ce3edf6d JB |
1519 | if (!ieee80211_frame_allowed(rx)) { |
1520 | if (skb == frame) /* last frame */ | |
e4c26add | 1521 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1522 | dev_kfree_skb(frame); |
1523 | continue; | |
1524 | } | |
fd4c7f2f RR |
1525 | |
1526 | ieee80211_deliver_skb(rx); | |
1527 | } | |
1528 | ||
9ae54c84 | 1529 | return RX_QUEUED; |
fd4c7f2f RR |
1530 | } |
1531 | ||
9ae54c84 | 1532 | static ieee80211_rx_result |
5cf121c3 | 1533 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1534 | { |
1535 | struct net_device *dev = rx->dev; | |
1536 | u16 fc; | |
ce3edf6d | 1537 | int err; |
76ee65bf RR |
1538 | |
1539 | fc = rx->fc; | |
1540 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
9ae54c84 | 1541 | return RX_CONTINUE; |
76ee65bf RR |
1542 | |
1543 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
e4c26add | 1544 | return RX_DROP_MONITOR; |
76ee65bf | 1545 | |
76ee65bf RR |
1546 | err = ieee80211_data_to_8023(rx); |
1547 | if (unlikely(err)) | |
e4c26add | 1548 | return RX_DROP_UNUSABLE; |
76ee65bf | 1549 | |
ce3edf6d | 1550 | if (!ieee80211_frame_allowed(rx)) |
e4c26add | 1551 | return RX_DROP_MONITOR; |
ce3edf6d | 1552 | |
76ee65bf RR |
1553 | rx->skb->dev = dev; |
1554 | ||
1555 | dev->stats.rx_packets++; | |
1556 | dev->stats.rx_bytes += rx->skb->len; | |
1557 | ||
1558 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1559 | |
9ae54c84 | 1560 | return RX_QUEUED; |
571ecf67 JB |
1561 | } |
1562 | ||
9ae54c84 | 1563 | static ieee80211_rx_result |
5cf121c3 | 1564 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1565 | { |
1566 | struct ieee80211_local *local = rx->local; | |
1567 | struct ieee80211_hw *hw = &local->hw; | |
1568 | struct sk_buff *skb = rx->skb; | |
1569 | struct ieee80211_bar *bar = (struct ieee80211_bar *) skb->data; | |
1570 | struct tid_ampdu_rx *tid_agg_rx; | |
1571 | u16 start_seq_num; | |
1572 | u16 tid; | |
1573 | ||
1574 | if (likely((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL)) | |
9ae54c84 | 1575 | return RX_CONTINUE; |
71364716 RR |
1576 | |
1577 | if ((rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BACK_REQ) { | |
1578 | if (!rx->sta) | |
9ae54c84 | 1579 | return RX_CONTINUE; |
71364716 | 1580 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1581 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1582 | != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1583 | return RX_CONTINUE; |
cee24a3e | 1584 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1585 | |
1586 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1587 | ||
1588 | /* reset session timer */ | |
1589 | if (tid_agg_rx->timeout) { | |
1590 | unsigned long expires = | |
1591 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
1592 | mod_timer(&tid_agg_rx->session_timer, expires); | |
1593 | } | |
1594 | ||
1595 | /* manage reordering buffer according to requested */ | |
1596 | /* sequence number */ | |
1597 | rcu_read_lock(); | |
1598 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, | |
1599 | start_seq_num, 1); | |
1600 | rcu_read_unlock(); | |
e4c26add | 1601 | return RX_DROP_UNUSABLE; |
71364716 RR |
1602 | } |
1603 | ||
9ae54c84 | 1604 | return RX_CONTINUE; |
71364716 RR |
1605 | } |
1606 | ||
9ae54c84 | 1607 | static ieee80211_rx_result |
5cf121c3 | 1608 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1609 | { |
1610 | struct ieee80211_sub_if_data *sdata; | |
1611 | ||
5cf121c3 | 1612 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1613 | return RX_DROP_MONITOR; |
571ecf67 JB |
1614 | |
1615 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
51fb61e7 | 1616 | if ((sdata->vif.type == IEEE80211_IF_TYPE_STA || |
33b64eb2 LCC |
1617 | sdata->vif.type == IEEE80211_IF_TYPE_IBSS || |
1618 | sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) && | |
ddd3d2be | 1619 | !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)) |
5cf121c3 | 1620 | ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->status); |
f9d540ee | 1621 | else |
e4c26add | 1622 | return RX_DROP_MONITOR; |
f9d540ee | 1623 | |
9ae54c84 | 1624 | return RX_QUEUED; |
571ecf67 JB |
1625 | } |
1626 | ||
571ecf67 JB |
1627 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, |
1628 | struct ieee80211_hdr *hdr, | |
5cf121c3 | 1629 | struct ieee80211_rx_data *rx) |
571ecf67 JB |
1630 | { |
1631 | int keyidx, hdrlen; | |
0795af57 JP |
1632 | DECLARE_MAC_BUF(mac); |
1633 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
1634 | |
1635 | hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb); | |
1636 | if (rx->skb->len >= hdrlen + 4) | |
1637 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1638 | else | |
1639 | keyidx = -1; | |
1640 | ||
1a84f3fd JB |
1641 | if (net_ratelimit()) |
1642 | printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC " | |
0795af57 JP |
1643 | "failure from %s to %s keyidx=%d\n", |
1644 | dev->name, print_mac(mac, hdr->addr2), | |
1645 | print_mac(mac2, hdr->addr1), keyidx); | |
571ecf67 | 1646 | |
8944b79f | 1647 | if (!rx->sta) { |
aa0daf0e JB |
1648 | /* |
1649 | * Some hardware seem to generate incorrect Michael MIC | |
1650 | * reports; ignore them to avoid triggering countermeasures. | |
1651 | */ | |
1a84f3fd JB |
1652 | if (net_ratelimit()) |
1653 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
0795af57 JP |
1654 | "error for unknown address %s\n", |
1655 | dev->name, print_mac(mac, hdr->addr2)); | |
571ecf67 JB |
1656 | goto ignore; |
1657 | } | |
1658 | ||
1659 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) { | |
1a84f3fd JB |
1660 | if (net_ratelimit()) |
1661 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
aa0daf0e | 1662 | "error for a frame with no PROTECTED flag (src " |
0795af57 | 1663 | "%s)\n", dev->name, print_mac(mac, hdr->addr2)); |
571ecf67 JB |
1664 | goto ignore; |
1665 | } | |
1666 | ||
51fb61e7 | 1667 | if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) { |
aa0daf0e JB |
1668 | /* |
1669 | * APs with pairwise keys should never receive Michael MIC | |
1670 | * errors for non-zero keyidx because these are reserved for | |
1671 | * group keys and only the AP is sending real multicast | |
1672 | * frames in the BSS. | |
1673 | */ | |
eb063c17 JB |
1674 | if (net_ratelimit()) |
1675 | printk(KERN_DEBUG "%s: ignored Michael MIC error for " | |
1676 | "a frame with non-zero keyidx (%d)" | |
0795af57 JP |
1677 | " (src %s)\n", dev->name, keyidx, |
1678 | print_mac(mac, hdr->addr2)); | |
eb063c17 | 1679 | goto ignore; |
571ecf67 JB |
1680 | } |
1681 | ||
1682 | if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA && | |
1683 | ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || | |
1684 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) { | |
1a84f3fd JB |
1685 | if (net_ratelimit()) |
1686 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
1687 | "error for a frame that cannot be encrypted " | |
0795af57 JP |
1688 | "(fc=0x%04x) (src %s)\n", |
1689 | dev->name, rx->fc, print_mac(mac, hdr->addr2)); | |
571ecf67 JB |
1690 | goto ignore; |
1691 | } | |
1692 | ||
eb063c17 | 1693 | mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr); |
571ecf67 JB |
1694 | ignore: |
1695 | dev_kfree_skb(rx->skb); | |
1696 | rx->skb = NULL; | |
1697 | } | |
1698 | ||
5cf121c3 JB |
1699 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
1700 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) | |
3d30d949 MW |
1701 | { |
1702 | struct ieee80211_sub_if_data *sdata; | |
1703 | struct ieee80211_local *local = rx->local; | |
1704 | struct ieee80211_rtap_hdr { | |
1705 | struct ieee80211_radiotap_header hdr; | |
1706 | u8 flags; | |
1707 | u8 rate; | |
1708 | __le16 chan_freq; | |
1709 | __le16 chan_flags; | |
1710 | } __attribute__ ((packed)) *rthdr; | |
1711 | struct sk_buff *skb = rx->skb, *skb2; | |
1712 | struct net_device *prev_dev = NULL; | |
5cf121c3 | 1713 | struct ieee80211_rx_status *status = rx->status; |
3d30d949 | 1714 | |
5cf121c3 | 1715 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1716 | goto out_free_skb; |
1717 | ||
1718 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1719 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1720 | goto out_free_skb; | |
1721 | ||
1722 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1723 | memset(rthdr, 0, sizeof(*rthdr)); | |
1724 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1725 | rthdr->hdr.it_present = | |
1726 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1727 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1728 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1729 | ||
5cf121c3 | 1730 | rthdr->rate = rx->rate->bitrate / 5; |
3d30d949 MW |
1731 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1732 | ||
1733 | if (status->band == IEEE80211_BAND_5GHZ) | |
1734 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1735 | IEEE80211_CHAN_5GHZ); | |
1736 | else | |
1737 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1738 | IEEE80211_CHAN_2GHZ); | |
1739 | ||
1740 | skb_set_mac_header(skb, 0); | |
1741 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1742 | skb->pkt_type = PACKET_OTHERHOST; | |
1743 | skb->protocol = htons(ETH_P_802_2); | |
1744 | ||
1745 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1746 | if (!netif_running(sdata->dev)) | |
1747 | continue; | |
1748 | ||
1749 | if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR || | |
1750 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) | |
1751 | continue; | |
1752 | ||
1753 | if (prev_dev) { | |
1754 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1755 | if (skb2) { | |
1756 | skb2->dev = prev_dev; | |
1757 | netif_rx(skb2); | |
1758 | } | |
1759 | } | |
1760 | ||
1761 | prev_dev = sdata->dev; | |
1762 | sdata->dev->stats.rx_packets++; | |
1763 | sdata->dev->stats.rx_bytes += skb->len; | |
1764 | } | |
1765 | ||
1766 | if (prev_dev) { | |
1767 | skb->dev = prev_dev; | |
1768 | netif_rx(skb); | |
1769 | skb = NULL; | |
1770 | } else | |
1771 | goto out_free_skb; | |
1772 | ||
5cf121c3 | 1773 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
1774 | return; |
1775 | ||
1776 | out_free_skb: | |
1777 | dev_kfree_skb(skb); | |
1778 | } | |
1779 | ||
5cf121c3 | 1780 | typedef ieee80211_rx_result (*ieee80211_rx_handler)(struct ieee80211_rx_data *); |
58905290 | 1781 | static ieee80211_rx_handler ieee80211_rx_handlers[] = |
571ecf67 JB |
1782 | { |
1783 | ieee80211_rx_h_if_stats, | |
571ecf67 JB |
1784 | ieee80211_rx_h_passive_scan, |
1785 | ieee80211_rx_h_check, | |
4f0d18e2 | 1786 | ieee80211_rx_h_decrypt, |
70f08765 | 1787 | ieee80211_rx_h_sta_process, |
571ecf67 JB |
1788 | ieee80211_rx_h_defragment, |
1789 | ieee80211_rx_h_ps_poll, | |
1790 | ieee80211_rx_h_michael_mic_verify, | |
1791 | /* this must be after decryption - so header is counted in MPDU mic | |
1792 | * must be before pae and data, so QOS_DATA format frames | |
1793 | * are not passed to user space by these functions | |
1794 | */ | |
1795 | ieee80211_rx_h_remove_qos_control, | |
fd4c7f2f | 1796 | ieee80211_rx_h_amsdu, |
571ecf67 | 1797 | ieee80211_rx_h_data, |
71364716 | 1798 | ieee80211_rx_h_ctrl, |
571ecf67 JB |
1799 | ieee80211_rx_h_mgmt, |
1800 | NULL | |
1801 | }; | |
1802 | ||
8944b79f | 1803 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1804 | struct ieee80211_rx_data *rx, |
8944b79f | 1805 | struct sk_buff *skb) |
58905290 JB |
1806 | { |
1807 | ieee80211_rx_handler *handler; | |
1808 | ieee80211_rx_result res = RX_DROP_MONITOR; | |
1809 | ||
8944b79f JB |
1810 | rx->skb = skb; |
1811 | rx->sdata = sdata; | |
1812 | rx->dev = sdata->dev; | |
1813 | ||
58905290 JB |
1814 | for (handler = ieee80211_rx_handlers; *handler != NULL; handler++) { |
1815 | res = (*handler)(rx); | |
1816 | ||
1817 | switch (res) { | |
1818 | case RX_CONTINUE: | |
1819 | continue; | |
1820 | case RX_DROP_UNUSABLE: | |
1821 | case RX_DROP_MONITOR: | |
8944b79f JB |
1822 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1823 | if (rx->sta) | |
1824 | rx->sta->rx_dropped++; | |
58905290 JB |
1825 | break; |
1826 | case RX_QUEUED: | |
8944b79f | 1827 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); |
58905290 JB |
1828 | break; |
1829 | } | |
1830 | break; | |
1831 | } | |
1832 | ||
1833 | switch (res) { | |
3d30d949 | 1834 | case RX_CONTINUE: |
58905290 | 1835 | case RX_DROP_MONITOR: |
3d30d949 MW |
1836 | ieee80211_rx_cooked_monitor(rx); |
1837 | break; | |
58905290 | 1838 | case RX_DROP_UNUSABLE: |
58905290 JB |
1839 | dev_kfree_skb(rx->skb); |
1840 | break; | |
1841 | } | |
1842 | } | |
1843 | ||
571ecf67 JB |
1844 | /* main receive path */ |
1845 | ||
23a24def | 1846 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1847 | u8 *bssid, struct ieee80211_rx_data *rx, |
23a24def JB |
1848 | struct ieee80211_hdr *hdr) |
1849 | { | |
1850 | int multicast = is_multicast_ether_addr(hdr->addr1); | |
1851 | ||
51fb61e7 | 1852 | switch (sdata->vif.type) { |
23a24def JB |
1853 | case IEEE80211_IF_TYPE_STA: |
1854 | if (!bssid) | |
1855 | return 0; | |
1856 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
5cf121c3 | 1857 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1858 | return 0; |
5cf121c3 | 1859 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1860 | } else if (!multicast && |
1861 | compare_ether_addr(sdata->dev->dev_addr, | |
1862 | hdr->addr1) != 0) { | |
4150c572 | 1863 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1864 | return 0; |
5cf121c3 | 1865 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1866 | } |
1867 | break; | |
1868 | case IEEE80211_IF_TYPE_IBSS: | |
1869 | if (!bssid) | |
1870 | return 0; | |
9d9bf77d BR |
1871 | if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT && |
1872 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) | |
1873 | return 1; | |
1874 | else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
5cf121c3 | 1875 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1876 | return 0; |
5cf121c3 | 1877 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1878 | } else if (!multicast && |
1879 | compare_ether_addr(sdata->dev->dev_addr, | |
1880 | hdr->addr1) != 0) { | |
4150c572 | 1881 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1882 | return 0; |
5cf121c3 | 1883 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1884 | } else if (!rx->sta) |
1885 | rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb, | |
1886 | bssid, hdr->addr2); | |
1887 | break; | |
6032f934 JB |
1888 | case IEEE80211_IF_TYPE_MESH_POINT: |
1889 | if (!multicast && | |
1890 | compare_ether_addr(sdata->dev->dev_addr, | |
1891 | hdr->addr1) != 0) { | |
1892 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
1893 | return 0; | |
1894 | ||
5cf121c3 | 1895 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
1896 | } |
1897 | break; | |
fb1c1cd6 | 1898 | case IEEE80211_IF_TYPE_VLAN: |
23a24def JB |
1899 | case IEEE80211_IF_TYPE_AP: |
1900 | if (!bssid) { | |
1901 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1902 | hdr->addr1)) | |
1903 | return 0; | |
1904 | } else if (!ieee80211_bssid_match(bssid, | |
1905 | sdata->dev->dev_addr)) { | |
5cf121c3 | 1906 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1907 | return 0; |
5cf121c3 | 1908 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 1909 | } |
badffb72 | 1910 | if (sdata->dev == sdata->local->mdev && |
5cf121c3 | 1911 | !(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def JB |
1912 | /* do not receive anything via |
1913 | * master device when not scanning */ | |
1914 | return 0; | |
1915 | break; | |
1916 | case IEEE80211_IF_TYPE_WDS: | |
1917 | if (bssid || | |
1918 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) | |
1919 | return 0; | |
1920 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
1921 | return 0; | |
1922 | break; | |
fb1c1cd6 JB |
1923 | case IEEE80211_IF_TYPE_MNTR: |
1924 | /* take everything */ | |
1925 | break; | |
a2897552 | 1926 | case IEEE80211_IF_TYPE_INVALID: |
fb1c1cd6 JB |
1927 | /* should never get here */ |
1928 | WARN_ON(1); | |
1929 | break; | |
23a24def JB |
1930 | } |
1931 | ||
1932 | return 1; | |
1933 | } | |
1934 | ||
571ecf67 | 1935 | /* |
6368e4b1 RR |
1936 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
1937 | * be called with rcu_read_lock protection. | |
571ecf67 | 1938 | */ |
71ebb4aa RR |
1939 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
1940 | struct sk_buff *skb, | |
1941 | struct ieee80211_rx_status *status, | |
8318d78a JB |
1942 | u32 load, |
1943 | struct ieee80211_rate *rate) | |
571ecf67 JB |
1944 | { |
1945 | struct ieee80211_local *local = hw_to_local(hw); | |
1946 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 1947 | struct ieee80211_hdr *hdr; |
5cf121c3 | 1948 | struct ieee80211_rx_data rx; |
571ecf67 | 1949 | u16 type; |
6368e4b1 | 1950 | int prepares; |
8e6f0032 JB |
1951 | struct ieee80211_sub_if_data *prev = NULL; |
1952 | struct sk_buff *skb_new; | |
1953 | u8 *bssid; | |
571ecf67 JB |
1954 | |
1955 | hdr = (struct ieee80211_hdr *) skb->data; | |
1956 | memset(&rx, 0, sizeof(rx)); | |
1957 | rx.skb = skb; | |
1958 | rx.local = local; | |
1959 | ||
5cf121c3 JB |
1960 | rx.status = status; |
1961 | rx.load = load; | |
1962 | rx.rate = rate; | |
b2e7771e | 1963 | rx.fc = le16_to_cpu(hdr->frame_control); |
571ecf67 | 1964 | type = rx.fc & IEEE80211_FCTL_FTYPE; |
72abd81b | 1965 | |
b2e7771e | 1966 | if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT) |
571ecf67 | 1967 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 1968 | |
8944b79f JB |
1969 | rx.sta = sta_info_get(local, hdr->addr2); |
1970 | if (rx.sta) { | |
d0709a65 JB |
1971 | rx.sdata = rx.sta->sdata; |
1972 | rx.dev = rx.sta->sdata->dev; | |
b2e7771e | 1973 | } |
571ecf67 | 1974 | |
571ecf67 | 1975 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
8944b79f | 1976 | ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx); |
d0709a65 | 1977 | return; |
571ecf67 JB |
1978 | } |
1979 | ||
ece8eddd | 1980 | if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning)) |
5cf121c3 | 1981 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 1982 | |
38f3714d JB |
1983 | ieee80211_parse_qos(&rx); |
1984 | ieee80211_verify_ip_alignment(&rx); | |
1985 | ||
571ecf67 JB |
1986 | skb = rx.skb; |
1987 | ||
79010420 | 1988 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
1989 | if (!netif_running(sdata->dev)) |
1990 | continue; | |
1991 | ||
51fb61e7 | 1992 | if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) |
b2e7771e JB |
1993 | continue; |
1994 | ||
51fb61e7 | 1995 | bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); |
5cf121c3 | 1996 | rx.flags |= IEEE80211_RX_RA_MATCH; |
6368e4b1 | 1997 | prepares = prepare_for_handlers(sdata, bssid, &rx, hdr); |
23a24def | 1998 | |
6368e4b1 | 1999 | if (!prepares) |
23a24def | 2000 | continue; |
8e6f0032 | 2001 | |
340e11f3 JB |
2002 | /* |
2003 | * frame is destined for this interface, but if it's not | |
2004 | * also for the previous one we handle that after the | |
2005 | * loop to avoid copying the SKB once too much | |
2006 | */ | |
2007 | ||
2008 | if (!prev) { | |
2009 | prev = sdata; | |
2010 | continue; | |
8e6f0032 | 2011 | } |
340e11f3 JB |
2012 | |
2013 | /* | |
2014 | * frame was destined for the previous interface | |
2015 | * so invoke RX handlers for it | |
2016 | */ | |
2017 | ||
2018 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2019 | if (!skb_new) { | |
2020 | if (net_ratelimit()) | |
2021 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 2022 | "multicast frame for %s\n", |
dd1cd4c6 JB |
2023 | wiphy_name(local->hw.wiphy), |
2024 | prev->dev->name); | |
340e11f3 JB |
2025 | continue; |
2026 | } | |
69f817b6 | 2027 | rx.fc = le16_to_cpu(hdr->frame_control); |
8944b79f | 2028 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 2029 | prev = sdata; |
571ecf67 | 2030 | } |
8e6f0032 | 2031 | if (prev) { |
69f817b6 | 2032 | rx.fc = le16_to_cpu(hdr->frame_control); |
8944b79f | 2033 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
8e6f0032 JB |
2034 | } else |
2035 | dev_kfree_skb(skb); | |
571ecf67 | 2036 | } |
6368e4b1 | 2037 | |
b580781e RR |
2038 | #define SEQ_MODULO 0x1000 |
2039 | #define SEQ_MASK 0xfff | |
2040 | ||
2041 | static inline int seq_less(u16 sq1, u16 sq2) | |
2042 | { | |
2043 | return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1)); | |
2044 | } | |
2045 | ||
2046 | static inline u16 seq_inc(u16 sq) | |
2047 | { | |
2048 | return ((sq + 1) & SEQ_MASK); | |
2049 | } | |
2050 | ||
2051 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
2052 | { | |
2053 | return ((sq1 - sq2) & SEQ_MASK); | |
2054 | } | |
2055 | ||
2056 | ||
71364716 RR |
2057 | /* |
2058 | * As it function blongs to Rx path it must be called with | |
2059 | * the proper rcu_read_lock protection for its flow. | |
2060 | */ | |
b580781e RR |
2061 | u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
2062 | struct tid_ampdu_rx *tid_agg_rx, | |
2063 | struct sk_buff *skb, u16 mpdu_seq_num, | |
2064 | int bar_req) | |
2065 | { | |
2066 | struct ieee80211_local *local = hw_to_local(hw); | |
2067 | struct ieee80211_rx_status status; | |
2068 | u16 head_seq_num, buf_size; | |
2069 | int index; | |
2070 | u32 pkt_load; | |
8318d78a JB |
2071 | struct ieee80211_supported_band *sband; |
2072 | struct ieee80211_rate *rate; | |
b580781e RR |
2073 | |
2074 | buf_size = tid_agg_rx->buf_size; | |
2075 | head_seq_num = tid_agg_rx->head_seq_num; | |
2076 | ||
2077 | /* frame with out of date sequence number */ | |
2078 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
2079 | dev_kfree_skb(skb); | |
2080 | return 1; | |
2081 | } | |
2082 | ||
2083 | /* if frame sequence number exceeds our buffering window size or | |
2084 | * block Ack Request arrived - release stored frames */ | |
2085 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
2086 | /* new head to the ordering buffer */ | |
2087 | if (bar_req) | |
2088 | head_seq_num = mpdu_seq_num; | |
2089 | else | |
2090 | head_seq_num = | |
2091 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
2092 | /* release stored frames up to new head to stack */ | |
2093 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
2094 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2095 | tid_agg_rx->ssn) | |
2096 | % tid_agg_rx->buf_size; | |
2097 | ||
2098 | if (tid_agg_rx->reorder_buf[index]) { | |
2099 | /* release the reordered frames to stack */ | |
2100 | memcpy(&status, | |
2101 | tid_agg_rx->reorder_buf[index]->cb, | |
2102 | sizeof(status)); | |
8318d78a JB |
2103 | sband = local->hw.wiphy->bands[status.band]; |
2104 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e RR |
2105 | pkt_load = ieee80211_rx_load_stats(local, |
2106 | tid_agg_rx->reorder_buf[index], | |
8318d78a | 2107 | &status, rate); |
b580781e RR |
2108 | __ieee80211_rx_handle_packet(hw, |
2109 | tid_agg_rx->reorder_buf[index], | |
8318d78a | 2110 | &status, pkt_load, rate); |
b580781e RR |
2111 | tid_agg_rx->stored_mpdu_num--; |
2112 | tid_agg_rx->reorder_buf[index] = NULL; | |
2113 | } | |
2114 | tid_agg_rx->head_seq_num = | |
2115 | seq_inc(tid_agg_rx->head_seq_num); | |
2116 | } | |
2117 | if (bar_req) | |
2118 | return 1; | |
2119 | } | |
2120 | ||
2121 | /* now the new frame is always in the range of the reordering */ | |
2122 | /* buffer window */ | |
2123 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
2124 | % tid_agg_rx->buf_size; | |
2125 | /* check if we already stored this frame */ | |
2126 | if (tid_agg_rx->reorder_buf[index]) { | |
2127 | dev_kfree_skb(skb); | |
2128 | return 1; | |
2129 | } | |
2130 | ||
2131 | /* if arrived mpdu is in the right order and nothing else stored */ | |
2132 | /* release it immediately */ | |
2133 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
2134 | tid_agg_rx->stored_mpdu_num == 0) { | |
2135 | tid_agg_rx->head_seq_num = | |
2136 | seq_inc(tid_agg_rx->head_seq_num); | |
2137 | return 0; | |
2138 | } | |
2139 | ||
2140 | /* put the frame in the reordering buffer */ | |
2141 | tid_agg_rx->reorder_buf[index] = skb; | |
2142 | tid_agg_rx->stored_mpdu_num++; | |
2143 | /* release the buffer until next missing frame */ | |
2144 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
2145 | % tid_agg_rx->buf_size; | |
2146 | while (tid_agg_rx->reorder_buf[index]) { | |
2147 | /* release the reordered frame back to stack */ | |
2148 | memcpy(&status, tid_agg_rx->reorder_buf[index]->cb, | |
2149 | sizeof(status)); | |
8318d78a JB |
2150 | sband = local->hw.wiphy->bands[status.band]; |
2151 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e RR |
2152 | pkt_load = ieee80211_rx_load_stats(local, |
2153 | tid_agg_rx->reorder_buf[index], | |
8318d78a | 2154 | &status, rate); |
b580781e | 2155 | __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index], |
8318d78a | 2156 | &status, pkt_load, rate); |
b580781e RR |
2157 | tid_agg_rx->stored_mpdu_num--; |
2158 | tid_agg_rx->reorder_buf[index] = NULL; | |
2159 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2160 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2161 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2162 | } | |
2163 | return 1; | |
2164 | } | |
2165 | ||
71ebb4aa RR |
2166 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
2167 | struct sk_buff *skb) | |
b580781e RR |
2168 | { |
2169 | struct ieee80211_hw *hw = &local->hw; | |
2170 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2171 | struct sta_info *sta; | |
2172 | struct tid_ampdu_rx *tid_agg_rx; | |
2173 | u16 fc, sc; | |
2174 | u16 mpdu_seq_num; | |
2175 | u8 ret = 0, *qc; | |
2176 | int tid; | |
2177 | ||
2178 | sta = sta_info_get(local, hdr->addr2); | |
2179 | if (!sta) | |
2180 | return ret; | |
2181 | ||
2182 | fc = le16_to_cpu(hdr->frame_control); | |
2183 | ||
2184 | /* filter the QoS data rx stream according to | |
2185 | * STA/TID and check if this STA/TID is on aggregation */ | |
2186 | if (!WLAN_FC_IS_QOS_DATA(fc)) | |
2187 | goto end_reorder; | |
2188 | ||
2189 | qc = skb->data + ieee80211_get_hdrlen(fc) - QOS_CONTROL_LEN; | |
2190 | tid = qc[0] & QOS_CONTROL_TID_MASK; | |
b580781e | 2191 | |
cee24a3e | 2192 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
b580781e RR |
2193 | goto end_reorder; |
2194 | ||
cee24a3e RR |
2195 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2196 | ||
b580781e | 2197 | /* null data frames are excluded */ |
8b6bbe75 | 2198 | if (unlikely(fc & IEEE80211_STYPE_NULLFUNC)) |
b580781e RR |
2199 | goto end_reorder; |
2200 | ||
2201 | /* new un-ordered ampdu frame - process it */ | |
2202 | ||
2203 | /* reset session timer */ | |
2204 | if (tid_agg_rx->timeout) { | |
2205 | unsigned long expires = | |
2206 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
2207 | mod_timer(&tid_agg_rx->session_timer, expires); | |
2208 | } | |
2209 | ||
2210 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2211 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2212 | if (sc & IEEE80211_SCTL_FRAG) { | |
d0709a65 | 2213 | ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr, |
b580781e RR |
2214 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
2215 | ret = 1; | |
2216 | goto end_reorder; | |
2217 | } | |
2218 | ||
2219 | /* according to mpdu sequence number deal with reordering buffer */ | |
2220 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
2221 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, | |
2222 | mpdu_seq_num, 0); | |
d0709a65 | 2223 | end_reorder: |
b580781e RR |
2224 | return ret; |
2225 | } | |
2226 | ||
6368e4b1 RR |
2227 | /* |
2228 | * This is the receive path handler. It is called by a low level driver when an | |
2229 | * 802.11 MPDU is received from the hardware. | |
2230 | */ | |
2231 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2232 | struct ieee80211_rx_status *status) | |
2233 | { | |
2234 | struct ieee80211_local *local = hw_to_local(hw); | |
2235 | u32 pkt_load; | |
8318d78a JB |
2236 | struct ieee80211_rate *rate = NULL; |
2237 | struct ieee80211_supported_band *sband; | |
2238 | ||
2239 | if (status->band < 0 || | |
13d8fd2d | 2240 | status->band >= IEEE80211_NUM_BANDS) { |
8318d78a JB |
2241 | WARN_ON(1); |
2242 | return; | |
2243 | } | |
2244 | ||
2245 | sband = local->hw.wiphy->bands[status->band]; | |
2246 | ||
2247 | if (!sband || | |
2248 | status->rate_idx < 0 || | |
2249 | status->rate_idx >= sband->n_bitrates) { | |
2250 | WARN_ON(1); | |
2251 | return; | |
2252 | } | |
2253 | ||
2254 | rate = &sband->bitrates[status->rate_idx]; | |
6368e4b1 RR |
2255 | |
2256 | /* | |
2257 | * key references and virtual interfaces are protected using RCU | |
2258 | * and this requires that we are in a read-side RCU section during | |
2259 | * receive processing | |
2260 | */ | |
2261 | rcu_read_lock(); | |
2262 | ||
2263 | /* | |
2264 | * Frames with failed FCS/PLCP checksum are not returned, | |
2265 | * all other frames are returned without radiotap header | |
2266 | * if it was previously present. | |
2267 | * Also, frames with less than 16 bytes are dropped. | |
2268 | */ | |
8318d78a | 2269 | skb = ieee80211_rx_monitor(local, skb, status, rate); |
6368e4b1 RR |
2270 | if (!skb) { |
2271 | rcu_read_unlock(); | |
2272 | return; | |
2273 | } | |
2274 | ||
8318d78a | 2275 | pkt_load = ieee80211_rx_load_stats(local, skb, status, rate); |
b580781e | 2276 | local->channel_use_raw += pkt_load; |
6368e4b1 | 2277 | |
b580781e | 2278 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
8318d78a | 2279 | __ieee80211_rx_handle_packet(hw, skb, status, pkt_load, rate); |
6368e4b1 RR |
2280 | |
2281 | rcu_read_unlock(); | |
2282 | } | |
571ecf67 JB |
2283 | EXPORT_SYMBOL(__ieee80211_rx); |
2284 | ||
2285 | /* This is a version of the rx handler that can be called from hard irq | |
2286 | * context. Post the skb on the queue and schedule the tasklet */ | |
2287 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2288 | struct ieee80211_rx_status *status) | |
2289 | { | |
2290 | struct ieee80211_local *local = hw_to_local(hw); | |
2291 | ||
2292 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2293 | ||
2294 | skb->dev = local->mdev; | |
2295 | /* copy status into skb->cb for use by tasklet */ | |
2296 | memcpy(skb->cb, status, sizeof(*status)); | |
2297 | skb->pkt_type = IEEE80211_RX_MSG; | |
2298 | skb_queue_tail(&local->skb_queue, skb); | |
2299 | tasklet_schedule(&local->tasklet); | |
2300 | } | |
2301 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |