Commit | Line | Data |
---|---|---|
571ecf67 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
5 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
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 | ||
c6a1fa12 JB |
29 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
30 | struct tid_ampdu_rx *tid_agg_rx, | |
31 | struct sk_buff *skb, | |
32 | u16 mpdu_seq_num, | |
33 | int bar_req); | |
b2e7771e JB |
34 | /* |
35 | * monitor mode reception | |
36 | * | |
37 | * This function cleans up the SKB, i.e. it removes all the stuff | |
38 | * only useful for monitoring. | |
39 | */ | |
40 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
41 | struct sk_buff *skb, | |
42 | int rtap_len) | |
43 | { | |
44 | skb_pull(skb, rtap_len); | |
45 | ||
46 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { | |
47 | if (likely(skb->len > FCS_LEN)) | |
48 | skb_trim(skb, skb->len - FCS_LEN); | |
49 | else { | |
50 | /* driver bug */ | |
51 | WARN_ON(1); | |
52 | dev_kfree_skb(skb); | |
53 | skb = NULL; | |
54 | } | |
55 | } | |
56 | ||
57 | return skb; | |
58 | } | |
59 | ||
60 | static inline int should_drop_frame(struct ieee80211_rx_status *status, | |
61 | struct sk_buff *skb, | |
62 | int present_fcs_len, | |
63 | int radiotap_len) | |
64 | { | |
182503ab | 65 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b2e7771e JB |
66 | |
67 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
68 | return 1; | |
69 | if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len)) | |
70 | return 1; | |
87228f57 HH |
71 | if (ieee80211_is_ctl(hdr->frame_control) && |
72 | !ieee80211_is_pspoll(hdr->frame_control) && | |
73 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
74 | return 1; |
75 | return 0; | |
76 | } | |
77 | ||
601ae7f2 BR |
78 | static int |
79 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
80 | struct ieee80211_rx_status *status) | |
81 | { | |
82 | int len; | |
83 | ||
84 | /* always present fields */ | |
85 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
86 | ||
87 | if (status->flag & RX_FLAG_TSFT) | |
88 | len += 8; | |
89 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DB || | |
90 | local->hw.flags & IEEE80211_HW_SIGNAL_DBM) | |
91 | len += 1; | |
92 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) | |
93 | len += 1; | |
94 | ||
95 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
96 | len++; | |
97 | ||
98 | /* make sure radiotap starts at a naturally aligned address */ | |
99 | if (len % 8) | |
100 | len = roundup(len, 8); | |
101 | ||
102 | return len; | |
103 | } | |
104 | ||
105 | /** | |
106 | * ieee80211_add_rx_radiotap_header - add radiotap header | |
107 | * | |
108 | * add a radiotap header containing all the fields which the hardware provided. | |
109 | */ | |
110 | static void | |
111 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
112 | struct sk_buff *skb, | |
113 | struct ieee80211_rx_status *status, | |
114 | struct ieee80211_rate *rate, | |
115 | int rtap_len) | |
116 | { | |
117 | struct ieee80211_radiotap_header *rthdr; | |
118 | unsigned char *pos; | |
119 | ||
120 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
121 | memset(rthdr, 0, rtap_len); | |
122 | ||
123 | /* radiotap header, set always present flags */ | |
124 | rthdr->it_present = | |
125 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
126 | (1 << IEEE80211_RADIOTAP_RATE) | | |
127 | (1 << IEEE80211_RADIOTAP_CHANNEL) | | |
128 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
129 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
130 | rthdr->it_len = cpu_to_le16(rtap_len); | |
131 | ||
132 | pos = (unsigned char *)(rthdr+1); | |
133 | ||
134 | /* the order of the following fields is important */ | |
135 | ||
136 | /* IEEE80211_RADIOTAP_TSFT */ | |
137 | if (status->flag & RX_FLAG_TSFT) { | |
138 | *(__le64 *)pos = cpu_to_le64(status->mactime); | |
139 | rthdr->it_present |= | |
140 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
141 | pos += 8; | |
142 | } | |
143 | ||
144 | /* IEEE80211_RADIOTAP_FLAGS */ | |
145 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
146 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
b4f28bbb BR |
147 | if (status->flag & RX_FLAG_SHORTPRE) |
148 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
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); | |
9deb1ae5 BR |
161 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
162 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
163 | IEEE80211_CHAN_2GHZ); | |
601ae7f2 | 164 | else |
9deb1ae5 | 165 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK | |
601ae7f2 BR |
166 | IEEE80211_CHAN_2GHZ); |
167 | pos += 2; | |
168 | ||
169 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
170 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
171 | *pos = status->signal; | |
172 | rthdr->it_present |= | |
173 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
174 | pos++; | |
175 | } | |
176 | ||
177 | /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ | |
178 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { | |
179 | *pos = status->noise; | |
180 | rthdr->it_present |= | |
181 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); | |
182 | pos++; | |
183 | } | |
184 | ||
185 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ | |
186 | ||
187 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
188 | *pos = status->antenna; | |
189 | pos++; | |
190 | ||
191 | /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */ | |
192 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) { | |
193 | *pos = status->signal; | |
194 | rthdr->it_present |= | |
195 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL); | |
196 | pos++; | |
197 | } | |
198 | ||
199 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ | |
200 | ||
201 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
202 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
203 | if ((pos - (unsigned char *)rthdr) & 1) | |
204 | pos++; | |
205 | /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */ | |
206 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
207 | *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS); | |
208 | pos += 2; | |
209 | } | |
210 | ||
b2e7771e JB |
211 | /* |
212 | * This function copies a received frame to all monitor interfaces and | |
213 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
214 | * radiotap header the driver might have added. | |
215 | */ | |
216 | static struct sk_buff * | |
217 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a JB |
218 | struct ieee80211_rx_status *status, |
219 | struct ieee80211_rate *rate) | |
b2e7771e JB |
220 | { |
221 | struct ieee80211_sub_if_data *sdata; | |
b2e7771e | 222 | int needed_headroom = 0; |
b2e7771e JB |
223 | struct sk_buff *skb, *skb2; |
224 | struct net_device *prev_dev = NULL; | |
225 | int present_fcs_len = 0; | |
226 | int rtap_len = 0; | |
227 | ||
228 | /* | |
229 | * First, we may need to make a copy of the skb because | |
230 | * (1) we need to modify it for radiotap (if not present), and | |
231 | * (2) the other RX handlers will modify the skb we got. | |
232 | * | |
233 | * We don't need to, of course, if we aren't going to return | |
234 | * the SKB because it has a bad FCS/PLCP checksum. | |
235 | */ | |
236 | if (status->flag & RX_FLAG_RADIOTAP) | |
237 | rtap_len = ieee80211_get_radiotap_len(origskb->data); | |
238 | else | |
601ae7f2 BR |
239 | /* room for the radiotap header based on driver features */ |
240 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
241 | |
242 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
243 | present_fcs_len = FCS_LEN; | |
244 | ||
245 | if (!local->monitors) { | |
246 | if (should_drop_frame(status, origskb, present_fcs_len, | |
247 | rtap_len)) { | |
248 | dev_kfree_skb(origskb); | |
249 | return NULL; | |
250 | } | |
251 | ||
252 | return remove_monitor_info(local, origskb, rtap_len); | |
253 | } | |
254 | ||
255 | if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) { | |
256 | /* only need to expand headroom if necessary */ | |
257 | skb = origskb; | |
258 | origskb = NULL; | |
259 | ||
260 | /* | |
261 | * This shouldn't trigger often because most devices have an | |
262 | * RX header they pull before we get here, and that should | |
263 | * be big enough for our radiotap information. We should | |
264 | * probably export the length to drivers so that we can have | |
265 | * them allocate enough headroom to start with. | |
266 | */ | |
267 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 268 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
269 | dev_kfree_skb(skb); |
270 | return NULL; | |
271 | } | |
272 | } else { | |
273 | /* | |
274 | * Need to make a copy and possibly remove radiotap header | |
275 | * and FCS from the original. | |
276 | */ | |
277 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
278 | ||
279 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
280 | ||
281 | if (!skb) | |
282 | return origskb; | |
283 | } | |
284 | ||
285 | /* if necessary, prepend radiotap information */ | |
601ae7f2 BR |
286 | if (!(status->flag & RX_FLAG_RADIOTAP)) |
287 | ieee80211_add_rx_radiotap_header(local, skb, status, rate, | |
288 | needed_headroom); | |
b2e7771e | 289 | |
ce3edf6d | 290 | skb_reset_mac_header(skb); |
b2e7771e JB |
291 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
292 | skb->pkt_type = PACKET_OTHERHOST; | |
293 | skb->protocol = htons(ETH_P_802_2); | |
294 | ||
295 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
296 | if (!netif_running(sdata->dev)) | |
297 | continue; | |
298 | ||
05c914fe | 299 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
300 | continue; |
301 | ||
3d30d949 MW |
302 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
303 | continue; | |
304 | ||
b2e7771e JB |
305 | if (prev_dev) { |
306 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
307 | if (skb2) { | |
308 | skb2->dev = prev_dev; | |
309 | netif_rx(skb2); | |
310 | } | |
311 | } | |
312 | ||
313 | prev_dev = sdata->dev; | |
314 | sdata->dev->stats.rx_packets++; | |
315 | sdata->dev->stats.rx_bytes += skb->len; | |
316 | } | |
317 | ||
318 | if (prev_dev) { | |
319 | skb->dev = prev_dev; | |
320 | netif_rx(skb); | |
321 | } else | |
322 | dev_kfree_skb(skb); | |
323 | ||
324 | return origskb; | |
325 | } | |
326 | ||
327 | ||
5cf121c3 | 328 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 329 | { |
238f74a2 | 330 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
331 | int tid; |
332 | ||
333 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
334 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
335 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 336 | /* frame has qos control */ |
238f74a2 HH |
337 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
338 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 339 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 340 | else |
5cf121c3 | 341 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 342 | } else { |
1411f9b5 JB |
343 | /* |
344 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
345 | * | |
346 | * Sequence numbers for management frames, QoS data | |
347 | * frames with a broadcast/multicast address in the | |
348 | * Address 1 field, and all non-QoS data frames sent | |
349 | * by QoS STAs are assigned using an additional single | |
350 | * modulo-4096 counter, [...] | |
351 | * | |
352 | * We also use that counter for non-QoS STAs. | |
353 | */ | |
354 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 355 | } |
52865dfd | 356 | |
5cf121c3 | 357 | rx->queue = tid; |
6e0d114d JB |
358 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
359 | * For now, set skb->priority to 0 for other cases. */ | |
360 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 361 | } |
6e0d114d | 362 | |
5cf121c3 | 363 | static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx) |
38f3714d JB |
364 | { |
365 | #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT | |
a7767f95 | 366 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
38f3714d JB |
367 | int hdrlen; |
368 | ||
a7767f95 | 369 | if (!ieee80211_is_data_present(hdr->frame_control)) |
38f3714d JB |
370 | return; |
371 | ||
372 | /* | |
373 | * Drivers are required to align the payload data in a way that | |
374 | * guarantees that the contained IP header is aligned to a four- | |
375 | * byte boundary. In the case of regular frames, this simply means | |
376 | * aligning the payload to a four-byte boundary (because either | |
377 | * the IP header is directly contained, or IV/RFC1042 headers that | |
378 | * have a length divisible by four are in front of it. | |
379 | * | |
380 | * With A-MSDU frames, however, the payload data address must | |
381 | * yield two modulo four because there are 14-byte 802.3 headers | |
382 | * within the A-MSDU frames that push the IP header further back | |
383 | * to a multiple of four again. Thankfully, the specs were sane | |
384 | * enough this time around to require padding each A-MSDU subframe | |
385 | * to a length that is a multiple of four. | |
386 | * | |
387 | * Padding like atheros hardware adds which is inbetween the 802.11 | |
388 | * header and the payload is not supported, the driver is required | |
389 | * to move the 802.11 header further back in that case. | |
390 | */ | |
a7767f95 | 391 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
5cf121c3 | 392 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d JB |
393 | hdrlen += ETH_HLEN; |
394 | WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3); | |
395 | #endif | |
6e0d114d JB |
396 | } |
397 | ||
6368e4b1 | 398 | |
571ecf67 JB |
399 | /* rx handlers */ |
400 | ||
49461622 | 401 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 402 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
403 | { |
404 | struct ieee80211_local *local = rx->local; | |
405 | struct sk_buff *skb = rx->skb; | |
406 | ||
c2b13452 JB |
407 | if (unlikely(local->hw_scanning)) |
408 | return ieee80211_scan_rx(rx->sdata, skb, rx->status); | |
ece8eddd | 409 | |
c2b13452 | 410 | if (unlikely(local->sw_scanning)) { |
ece8eddd | 411 | /* drop all the other packets during a software scan anyway */ |
c2b13452 | 412 | if (ieee80211_scan_rx(rx->sdata, skb, rx->status) |
9ae54c84 | 413 | != RX_QUEUED) |
ece8eddd | 414 | dev_kfree_skb(skb); |
9ae54c84 | 415 | return RX_QUEUED; |
571ecf67 JB |
416 | } |
417 | ||
5cf121c3 | 418 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
419 | /* scanning finished during invoking of handlers */ |
420 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 421 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
422 | } |
423 | ||
9ae54c84 | 424 | return RX_CONTINUE; |
571ecf67 JB |
425 | } |
426 | ||
33b64eb2 | 427 | static ieee80211_rx_result |
5cf121c3 | 428 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 429 | { |
a7767f95 HH |
430 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
431 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
d6d1a5a7 | 432 | |
a7767f95 HH |
433 | if (ieee80211_is_data(hdr->frame_control)) { |
434 | if (!ieee80211_has_a4(hdr->frame_control)) | |
33b64eb2 LCC |
435 | return RX_DROP_MONITOR; |
436 | if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0) | |
437 | return RX_DROP_MONITOR; | |
438 | } | |
439 | ||
440 | /* If there is not an established peer link and this is not a peer link | |
441 | * establisment frame, beacon or probe, drop the frame. | |
442 | */ | |
443 | ||
b4e08ea1 | 444 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 445 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 446 | |
a7767f95 | 447 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
448 | return RX_DROP_MONITOR; |
449 | ||
a7767f95 | 450 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 LCC |
451 | mgmt = (struct ieee80211_mgmt *)hdr; |
452 | if (mgmt->u.action.category != PLINK_CATEGORY) | |
453 | return RX_DROP_MONITOR; | |
33b64eb2 | 454 | return RX_CONTINUE; |
33b64eb2 LCC |
455 | } |
456 | ||
a7767f95 HH |
457 | if (ieee80211_is_probe_req(hdr->frame_control) || |
458 | ieee80211_is_probe_resp(hdr->frame_control) || | |
459 | ieee80211_is_beacon(hdr->frame_control)) | |
460 | return RX_CONTINUE; | |
461 | ||
462 | return RX_DROP_MONITOR; | |
463 | ||
464 | } | |
465 | ||
466 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
467 | ||
468 | if (ieee80211_is_data(hdr->frame_control) && | |
469 | is_multicast_ether_addr(hdr->addr1) && | |
f698d856 | 470 | mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 471 | return RX_DROP_MONITOR; |
902acc78 | 472 | #undef msh_h_get |
d6d1a5a7 | 473 | |
902acc78 JB |
474 | return RX_CONTINUE; |
475 | } | |
33b64eb2 LCC |
476 | |
477 | ||
49461622 | 478 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 479 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 480 | { |
a7767f95 | 481 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
482 | |
483 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
484 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 485 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 486 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 487 | hdr->seq_ctrl)) { |
5cf121c3 | 488 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
489 | rx->local->dot11FrameDuplicateCount++; |
490 | rx->sta->num_duplicates++; | |
491 | } | |
e4c26add | 492 | return RX_DROP_MONITOR; |
571ecf67 | 493 | } else |
5cf121c3 | 494 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
495 | } |
496 | ||
571ecf67 JB |
497 | if (unlikely(rx->skb->len < 16)) { |
498 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 499 | return RX_DROP_MONITOR; |
571ecf67 JB |
500 | } |
501 | ||
571ecf67 JB |
502 | /* Drop disallowed frame classes based on STA auth/assoc state; |
503 | * IEEE 802.11, Chap 5.5. | |
504 | * | |
ccd7b362 JB |
505 | * mac80211 filters only based on association state, i.e. it drops |
506 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
507 | * deauth/disassoc frames when needed. In addition, hostapd is |
508 | * responsible for filtering on both auth and assoc states. | |
509 | */ | |
33b64eb2 | 510 | |
902acc78 | 511 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 512 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 513 | |
a7767f95 HH |
514 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
515 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 516 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 517 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
518 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
519 | !ieee80211_has_tods(hdr->frame_control) && | |
520 | ieee80211_is_data(hdr->frame_control)) || | |
521 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
522 | /* Drop IBSS frames and frames for other hosts |
523 | * silently. */ | |
e4c26add | 524 | return RX_DROP_MONITOR; |
571ecf67 JB |
525 | } |
526 | ||
e4c26add | 527 | return RX_DROP_MONITOR; |
571ecf67 JB |
528 | } |
529 | ||
9ae54c84 | 530 | return RX_CONTINUE; |
570bd537 JB |
531 | } |
532 | ||
533 | ||
49461622 | 534 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 535 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 536 | { |
a7767f95 | 537 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
3017b80b JB |
538 | int keyidx; |
539 | int hdrlen; | |
e4c26add | 540 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 541 | struct ieee80211_key *stakey = NULL; |
570bd537 | 542 | |
3017b80b JB |
543 | /* |
544 | * Key selection 101 | |
545 | * | |
546 | * There are three types of keys: | |
547 | * - GTK (group keys) | |
548 | * - PTK (pairwise keys) | |
549 | * - STK (station-to-station pairwise keys) | |
550 | * | |
551 | * When selecting a key, we have to distinguish between multicast | |
552 | * (including broadcast) and unicast frames, the latter can only | |
553 | * use PTKs and STKs while the former always use GTKs. Unless, of | |
554 | * course, actual WEP keys ("pre-RSNA") are used, then unicast | |
555 | * frames can also use key indizes like GTKs. Hence, if we don't | |
556 | * have a PTK/STK we check the key index for a WEP key. | |
557 | * | |
8dc06a1c JB |
558 | * Note that in a regular BSS, multicast frames are sent by the |
559 | * AP only, associated stations unicast the frame to the AP first | |
560 | * which then multicasts it on their behalf. | |
561 | * | |
3017b80b JB |
562 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
563 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
564 | * The spec seems to expect that one negotiates the same key with |
565 | * every station but there's no such requirement; VLANs could be | |
566 | * possible. | |
3017b80b JB |
567 | */ |
568 | ||
a7767f95 | 569 | if (!ieee80211_has_protected(hdr->frame_control)) |
9ae54c84 | 570 | return RX_CONTINUE; |
571ecf67 | 571 | |
3017b80b | 572 | /* |
1990af8d | 573 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
574 | * addressed to us nor a multicast frame. |
575 | */ | |
5cf121c3 | 576 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 577 | return RX_CONTINUE; |
3017b80b | 578 | |
d4e46a3d JB |
579 | if (rx->sta) |
580 | stakey = rcu_dereference(rx->sta->key); | |
581 | ||
582 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { | |
583 | rx->key = stakey; | |
571ecf67 | 584 | } else { |
3017b80b JB |
585 | /* |
586 | * The device doesn't give us the IV so we won't be | |
587 | * able to look up the key. That's ok though, we | |
588 | * don't need to decrypt the frame, we just won't | |
589 | * be able to keep statistics accurate. | |
590 | * Except for key threshold notifications, should | |
591 | * we somehow allow the driver to tell us which key | |
592 | * the hardware used if this flag is set? | |
593 | */ | |
5cf121c3 JB |
594 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
595 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 596 | return RX_CONTINUE; |
3017b80b | 597 | |
a7767f95 | 598 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
599 | |
600 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 601 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
602 | |
603 | /* | |
604 | * no need to call ieee80211_wep_get_keyidx, | |
605 | * it verifies a bunch of things we've done already | |
606 | */ | |
607 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
608 | ||
d4e46a3d | 609 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
610 | |
611 | /* | |
612 | * RSNA-protected unicast frames should always be sent with | |
613 | * pairwise or station-to-station keys, but for WEP we allow | |
614 | * using a key index as well. | |
615 | */ | |
8f20fc24 | 616 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
617 | !is_multicast_ether_addr(hdr->addr1)) |
618 | rx->key = NULL; | |
571ecf67 JB |
619 | } |
620 | ||
3017b80b | 621 | if (rx->key) { |
571ecf67 | 622 | rx->key->tx_rx_count++; |
011bfcc4 | 623 | /* TODO: add threshold stuff again */ |
1990af8d | 624 | } else { |
e4c26add | 625 | return RX_DROP_MONITOR; |
70f08765 JB |
626 | } |
627 | ||
1990af8d JB |
628 | /* Check for weak IVs if possible */ |
629 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 630 | ieee80211_is_data(hdr->frame_control) && |
5cf121c3 JB |
631 | (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
632 | !(rx->status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
633 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
634 | rx->sta->wep_weak_iv_count++; | |
635 | ||
70f08765 JB |
636 | switch (rx->key->conf.alg) { |
637 | case ALG_WEP: | |
e2f036da MN |
638 | result = ieee80211_crypto_wep_decrypt(rx); |
639 | break; | |
70f08765 | 640 | case ALG_TKIP: |
e2f036da MN |
641 | result = ieee80211_crypto_tkip_decrypt(rx); |
642 | break; | |
70f08765 | 643 | case ALG_CCMP: |
e2f036da MN |
644 | result = ieee80211_crypto_ccmp_decrypt(rx); |
645 | break; | |
70f08765 JB |
646 | } |
647 | ||
e2f036da | 648 | /* either the frame has been decrypted or will be dropped */ |
5cf121c3 | 649 | rx->status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
650 | |
651 | return result; | |
70f08765 JB |
652 | } |
653 | ||
133b8226 | 654 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 655 | { |
133b8226 | 656 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
0795af57 | 657 | |
3e122be0 | 658 | atomic_inc(&sdata->bss->num_sta_ps); |
07346f81 | 659 | set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL); |
571ecf67 | 660 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
661 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
662 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 JB |
663 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
664 | } | |
665 | ||
133b8226 | 666 | static int ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 667 | { |
133b8226 JB |
668 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
669 | struct ieee80211_local *local = sdata->local; | |
571ecf67 JB |
670 | struct sk_buff *skb; |
671 | int sent = 0; | |
571ecf67 | 672 | |
3e122be0 | 673 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 674 | |
07346f81 | 675 | clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL); |
004c872e JB |
676 | |
677 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
678 | sta_info_clear_tim_bit(sta); | |
679 | ||
571ecf67 | 680 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
681 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
682 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 | 683 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 684 | |
571ecf67 JB |
685 | /* Send all buffered frames to the station */ |
686 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
571ecf67 | 687 | sent++; |
8b30b1fe | 688 | skb->requeue = 1; |
571ecf67 JB |
689 | dev_queue_xmit(skb); |
690 | } | |
691 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
571ecf67 JB |
692 | local->total_ps_buffered--; |
693 | sent++; | |
694 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 | 695 | printk(KERN_DEBUG "%s: STA %pM aid %d send PS frame " |
133b8226 | 696 | "since STA not sleeping anymore\n", sdata->dev->name, |
0c68ae26 | 697 | sta->sta.addr, sta->sta.aid); |
571ecf67 | 698 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
8b30b1fe | 699 | skb->requeue = 1; |
571ecf67 JB |
700 | dev_queue_xmit(skb); |
701 | } | |
702 | ||
703 | return sent; | |
704 | } | |
705 | ||
49461622 | 706 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 707 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
708 | { |
709 | struct sta_info *sta = rx->sta; | |
a7767f95 | 710 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
711 | |
712 | if (!sta) | |
9ae54c84 | 713 | return RX_CONTINUE; |
571ecf67 JB |
714 | |
715 | /* Update last_rx only for IBSS packets which are for the current | |
716 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
717 | * other STAs are using different BSSID. */ | |
05c914fe | 718 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 719 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 720 | NL80211_IFTYPE_ADHOC); |
571ecf67 JB |
721 | if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0) |
722 | sta->last_rx = jiffies; | |
723 | } else | |
724 | if (!is_multicast_ether_addr(hdr->addr1) || | |
05c914fe | 725 | rx->sdata->vif.type == NL80211_IFTYPE_STATION) { |
571ecf67 JB |
726 | /* Update last_rx only for unicast frames in order to prevent |
727 | * the Probe Request frames (the only broadcast frames from a | |
728 | * STA in infrastructure mode) from keeping a connection alive. | |
33b64eb2 LCC |
729 | * Mesh beacons will update last_rx when if they are found to |
730 | * match the current local configuration when processed. | |
571ecf67 JB |
731 | */ |
732 | sta->last_rx = jiffies; | |
733 | } | |
734 | ||
5cf121c3 | 735 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 736 | return RX_CONTINUE; |
571ecf67 JB |
737 | |
738 | sta->rx_fragments++; | |
739 | sta->rx_bytes += rx->skb->len; | |
5cf121c3 | 740 | sta->last_signal = rx->status->signal; |
566bfe5a | 741 | sta->last_qual = rx->status->qual; |
5cf121c3 | 742 | sta->last_noise = rx->status->noise; |
571ecf67 | 743 | |
72eaa43a JB |
744 | /* |
745 | * Change STA power saving mode only at the end of a frame | |
746 | * exchange sequence. | |
747 | */ | |
3e122be0 | 748 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
749 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
750 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
72eaa43a JB |
751 | if (test_sta_flags(sta, WLAN_STA_PS)) { |
752 | /* | |
753 | * Ignore doze->wake transitions that are | |
754 | * indicated by non-data frames, the standard | |
755 | * is unclear here, but for example going to | |
756 | * PS mode and then scanning would cause a | |
757 | * doze->wake transition for the probe request, | |
758 | * and that is clearly undesirable. | |
759 | */ | |
760 | if (ieee80211_is_data(hdr->frame_control) && | |
761 | !ieee80211_has_pm(hdr->frame_control)) | |
762 | rx->sent_ps_buffered += ap_sta_ps_end(sta); | |
763 | } else { | |
764 | if (ieee80211_has_pm(hdr->frame_control)) | |
765 | ap_sta_ps_start(sta); | |
766 | } | |
571ecf67 JB |
767 | } |
768 | ||
769 | /* Drop data::nullfunc frames silently, since they are used only to | |
770 | * control station power saving mode. */ | |
a7767f95 | 771 | if (ieee80211_is_nullfunc(hdr->frame_control)) { |
571ecf67 JB |
772 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
773 | /* Update counter and free packet here to avoid counting this | |
774 | * as a dropped packed. */ | |
775 | sta->rx_packets++; | |
776 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 777 | return RX_QUEUED; |
571ecf67 JB |
778 | } |
779 | ||
9ae54c84 | 780 | return RX_CONTINUE; |
571ecf67 JB |
781 | } /* ieee80211_rx_h_sta_process */ |
782 | ||
571ecf67 JB |
783 | static inline struct ieee80211_fragment_entry * |
784 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
785 | unsigned int frag, unsigned int seq, int rx_queue, | |
786 | struct sk_buff **skb) | |
787 | { | |
788 | struct ieee80211_fragment_entry *entry; | |
789 | int idx; | |
790 | ||
791 | idx = sdata->fragment_next; | |
792 | entry = &sdata->fragments[sdata->fragment_next++]; | |
793 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
794 | sdata->fragment_next = 0; | |
795 | ||
796 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 797 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
798 | struct ieee80211_hdr *hdr = |
799 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
800 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
801 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 802 | "addr1=%pM addr2=%pM\n", |
571ecf67 JB |
803 | sdata->dev->name, idx, |
804 | jiffies - entry->first_frag_time, entry->seq, | |
0c68ae26 | 805 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 806 | #endif |
571ecf67 JB |
807 | __skb_queue_purge(&entry->skb_list); |
808 | } | |
809 | ||
810 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
811 | *skb = NULL; | |
812 | entry->first_frag_time = jiffies; | |
813 | entry->seq = seq; | |
814 | entry->rx_queue = rx_queue; | |
815 | entry->last_frag = frag; | |
816 | entry->ccmp = 0; | |
817 | entry->extra_len = 0; | |
818 | ||
819 | return entry; | |
820 | } | |
821 | ||
822 | static inline struct ieee80211_fragment_entry * | |
823 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 824 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
825 | int rx_queue, struct ieee80211_hdr *hdr) |
826 | { | |
827 | struct ieee80211_fragment_entry *entry; | |
828 | int i, idx; | |
829 | ||
830 | idx = sdata->fragment_next; | |
831 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
832 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
833 | |
834 | idx--; | |
835 | if (idx < 0) | |
836 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
837 | ||
838 | entry = &sdata->fragments[idx]; | |
839 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
840 | entry->rx_queue != rx_queue || | |
841 | entry->last_frag + 1 != frag) | |
842 | continue; | |
843 | ||
b73d70ad | 844 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 845 | |
b73d70ad HH |
846 | /* |
847 | * Check ftype and addresses are equal, else check next fragment | |
848 | */ | |
849 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
850 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
851 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
852 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
853 | continue; | |
854 | ||
ab46623e | 855 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
856 | __skb_queue_purge(&entry->skb_list); |
857 | continue; | |
858 | } | |
859 | return entry; | |
860 | } | |
861 | ||
862 | return NULL; | |
863 | } | |
864 | ||
49461622 | 865 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 866 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
867 | { |
868 | struct ieee80211_hdr *hdr; | |
869 | u16 sc; | |
358c8d9d | 870 | __le16 fc; |
571ecf67 JB |
871 | unsigned int frag, seq; |
872 | struct ieee80211_fragment_entry *entry; | |
873 | struct sk_buff *skb; | |
874 | ||
b73d70ad | 875 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 876 | fc = hdr->frame_control; |
571ecf67 JB |
877 | sc = le16_to_cpu(hdr->seq_ctrl); |
878 | frag = sc & IEEE80211_SCTL_FRAG; | |
879 | ||
358c8d9d | 880 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
881 | (rx->skb)->len < 24 || |
882 | is_multicast_ether_addr(hdr->addr1))) { | |
883 | /* not fragmented */ | |
884 | goto out; | |
885 | } | |
886 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
887 | ||
888 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
889 | ||
890 | if (frag == 0) { | |
891 | /* This is the first fragment of a new frame. */ | |
892 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 893 | rx->queue, &(rx->skb)); |
8f20fc24 | 894 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 895 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
896 | /* Store CCMP PN so that we can verify that the next |
897 | * fragment has a sequential PN value. */ | |
898 | entry->ccmp = 1; | |
899 | memcpy(entry->last_pn, | |
5cf121c3 | 900 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
901 | CCMP_PN_LEN); |
902 | } | |
9ae54c84 | 903 | return RX_QUEUED; |
571ecf67 JB |
904 | } |
905 | ||
906 | /* This is a fragment for a frame that should already be pending in | |
907 | * fragment cache. Add this fragment to the end of the pending entry. | |
908 | */ | |
b73d70ad | 909 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
910 | if (!entry) { |
911 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 912 | return RX_DROP_MONITOR; |
571ecf67 JB |
913 | } |
914 | ||
915 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
916 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
917 | if (entry->ccmp) { | |
918 | int i; | |
919 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 920 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 921 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
922 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
923 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
924 | pn[i]++; | |
925 | if (pn[i]) | |
926 | break; | |
927 | } | |
5cf121c3 | 928 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 929 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 930 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
931 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
932 | } | |
933 | ||
358c8d9d | 934 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
935 | __skb_queue_tail(&entry->skb_list, rx->skb); |
936 | entry->last_frag = frag; | |
937 | entry->extra_len += rx->skb->len; | |
358c8d9d | 938 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 939 | rx->skb = NULL; |
9ae54c84 | 940 | return RX_QUEUED; |
571ecf67 JB |
941 | } |
942 | ||
943 | rx->skb = __skb_dequeue(&entry->skb_list); | |
944 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
945 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
946 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
947 | GFP_ATOMIC))) { | |
948 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
949 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 950 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
951 | } |
952 | } | |
953 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
954 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
955 | dev_kfree_skb(skb); | |
956 | } | |
957 | ||
958 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 959 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
960 | |
961 | out: | |
962 | if (rx->sta) | |
963 | rx->sta->rx_packets++; | |
964 | if (is_multicast_ether_addr(hdr->addr1)) | |
965 | rx->local->dot11MulticastReceivedFrameCount++; | |
966 | else | |
967 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 968 | return RX_CONTINUE; |
571ecf67 JB |
969 | } |
970 | ||
49461622 | 971 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 972 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 973 | { |
98f0b0a3 | 974 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
975 | struct sk_buff *skb; |
976 | int no_pending_pkts; | |
358c8d9d | 977 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 978 | |
358c8d9d | 979 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 980 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 981 | return RX_CONTINUE; |
571ecf67 | 982 | |
05c914fe JB |
983 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
984 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 985 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 986 | |
571ecf67 JB |
987 | skb = skb_dequeue(&rx->sta->tx_filtered); |
988 | if (!skb) { | |
989 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
990 | if (skb) | |
991 | rx->local->total_ps_buffered--; | |
992 | } | |
993 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
994 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
995 | ||
996 | if (skb) { | |
997 | struct ieee80211_hdr *hdr = | |
998 | (struct ieee80211_hdr *) skb->data; | |
999 | ||
4a9a66e9 JB |
1000 | /* |
1001 | * Tell TX path to send one frame even though the STA may | |
1002 | * still remain is PS mode after this frame exchange. | |
1003 | */ | |
07346f81 | 1004 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); |
571ecf67 JB |
1005 | |
1006 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 JB |
1007 | printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", |
1008 | rx->sta->sta.addr, rx->sta->sta.aid, | |
571ecf67 JB |
1009 | skb_queue_len(&rx->sta->ps_tx_buf)); |
1010 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
1011 | ||
1012 | /* Use MoreData flag to indicate whether there are more | |
1013 | * buffered frames for this STA */ | |
836341a7 | 1014 | if (no_pending_pkts) |
571ecf67 | 1015 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
836341a7 | 1016 | else |
571ecf67 JB |
1017 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
1018 | ||
1019 | dev_queue_xmit(skb); | |
1020 | ||
004c872e JB |
1021 | if (no_pending_pkts) |
1022 | sta_info_clear_tim_bit(rx->sta); | |
571ecf67 | 1023 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
5cf121c3 | 1024 | } else if (!rx->sent_ps_buffered) { |
004c872e JB |
1025 | /* |
1026 | * FIXME: This can be the result of a race condition between | |
1027 | * us expiring a frame and the station polling for it. | |
1028 | * Should we send it a null-func frame indicating we | |
1029 | * have nothing buffered for it? | |
1030 | */ | |
0c68ae26 | 1031 | printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " |
f4ea83dd | 1032 | "though there are no buffered frames for it\n", |
0c68ae26 | 1033 | rx->dev->name, rx->sta->sta.addr); |
571ecf67 | 1034 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
1035 | } |
1036 | ||
9ae54c84 | 1037 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1038 | * count as an dropped frame. */ |
1039 | dev_kfree_skb(rx->skb); | |
1040 | ||
9ae54c84 | 1041 | return RX_QUEUED; |
571ecf67 JB |
1042 | } |
1043 | ||
49461622 | 1044 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1045 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1046 | { |
6e0d114d | 1047 | u8 *data = rx->skb->data; |
238f74a2 | 1048 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1049 | |
238f74a2 | 1050 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1051 | return RX_CONTINUE; |
6e0d114d JB |
1052 | |
1053 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1054 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1055 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1056 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1057 | /* change frame type to non QOS */ |
238f74a2 | 1058 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1059 | |
9ae54c84 | 1060 | return RX_CONTINUE; |
6e0d114d JB |
1061 | } |
1062 | ||
76ee65bf | 1063 | static int |
5cf121c3 | 1064 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1065 | { |
07346f81 | 1066 | if (unlikely(!rx->sta || |
f4ea83dd | 1067 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1068 | return -EACCES; |
571ecf67 | 1069 | |
76ee65bf | 1070 | return 0; |
571ecf67 JB |
1071 | } |
1072 | ||
76ee65bf | 1073 | static int |
358c8d9d | 1074 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1075 | { |
3017b80b | 1076 | /* |
7848ba7d JB |
1077 | * Pass through unencrypted frames if the hardware has |
1078 | * decrypted them already. | |
3017b80b | 1079 | */ |
5cf121c3 | 1080 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1081 | return 0; |
571ecf67 JB |
1082 | |
1083 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1084 | if (unlikely(!ieee80211_has_protected(fc) && |
1085 | !ieee80211_is_nullfunc(fc) && | |
b3fc9c6c | 1086 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1087 | return -EACCES; |
b3fc9c6c | 1088 | |
76ee65bf | 1089 | return 0; |
571ecf67 JB |
1090 | } |
1091 | ||
76ee65bf | 1092 | static int |
5cf121c3 | 1093 | ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1094 | { |
1095 | struct net_device *dev = rx->dev; | |
571ecf67 | 1096 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; |
b73d70ad | 1097 | u16 hdrlen, ethertype; |
571ecf67 JB |
1098 | u8 *payload; |
1099 | u8 dst[ETH_ALEN]; | |
c97c23e3 | 1100 | u8 src[ETH_ALEN] __aligned(2); |
76ee65bf | 1101 | struct sk_buff *skb = rx->skb; |
571ecf67 JB |
1102 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1103 | ||
b73d70ad | 1104 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
76ee65bf | 1105 | return -1; |
571ecf67 | 1106 | |
b73d70ad | 1107 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1108 | |
1109 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
1110 | * header | |
1111 | * IEEE 802.11 address fields: | |
1112 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
1113 | * 0 0 DA SA BSSID n/a | |
1114 | * 0 1 DA BSSID SA n/a | |
1115 | * 1 0 BSSID SA DA n/a | |
1116 | * 1 1 RA TA DA SA | |
1117 | */ | |
b73d70ad HH |
1118 | memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); |
1119 | memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); | |
571ecf67 | 1120 | |
b73d70ad HH |
1121 | switch (hdr->frame_control & |
1122 | cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
1123 | case __constant_cpu_to_le16(IEEE80211_FCTL_TODS): | |
05c914fe JB |
1124 | if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP && |
1125 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
76ee65bf | 1126 | return -1; |
571ecf67 | 1127 | break; |
b73d70ad | 1128 | case __constant_cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): |
05c914fe JB |
1129 | if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS && |
1130 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT)) | |
76ee65bf | 1131 | return -1; |
79617dee Y |
1132 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
1133 | struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *) | |
1134 | (skb->data + hdrlen); | |
1135 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); | |
1136 | if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { | |
1137 | memcpy(dst, meshdr->eaddr1, ETH_ALEN); | |
1138 | memcpy(src, meshdr->eaddr2, ETH_ALEN); | |
1139 | } | |
1140 | } | |
571ecf67 | 1141 | break; |
b73d70ad | 1142 | case __constant_cpu_to_le16(IEEE80211_FCTL_FROMDS): |
05c914fe | 1143 | if (sdata->vif.type != NL80211_IFTYPE_STATION || |
b3316157 JL |
1144 | (is_multicast_ether_addr(dst) && |
1145 | !compare_ether_addr(src, dev->dev_addr))) | |
76ee65bf | 1146 | return -1; |
571ecf67 | 1147 | break; |
b73d70ad | 1148 | case __constant_cpu_to_le16(0): |
05c914fe | 1149 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
76ee65bf | 1150 | return -1; |
571ecf67 JB |
1151 | break; |
1152 | } | |
1153 | ||
f4ea83dd | 1154 | if (unlikely(skb->len - hdrlen < 8)) |
76ee65bf | 1155 | return -1; |
571ecf67 | 1156 | |
76ee65bf | 1157 | payload = skb->data + hdrlen; |
571ecf67 JB |
1158 | ethertype = (payload[6] << 8) | payload[7]; |
1159 | ||
1160 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1161 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1162 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1163 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1164 | * replace EtherType */ | |
1165 | skb_pull(skb, hdrlen + 6); | |
1166 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1167 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1168 | } else { | |
1169 | struct ethhdr *ehdr; | |
1170 | __be16 len; | |
ce3edf6d | 1171 | |
571ecf67 JB |
1172 | skb_pull(skb, hdrlen); |
1173 | len = htons(skb->len); | |
1174 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1175 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1176 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1177 | ehdr->h_proto = len; | |
1178 | } | |
76ee65bf RR |
1179 | return 0; |
1180 | } | |
571ecf67 | 1181 | |
ce3edf6d JB |
1182 | /* |
1183 | * requires that rx->skb is a frame with ethernet header | |
1184 | */ | |
358c8d9d | 1185 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1186 | { |
c97c23e3 | 1187 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1188 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1189 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1190 | ||
1191 | /* | |
1192 | * Allow EAPOL frames to us/the PAE group address regardless | |
1193 | * of whether the frame was encrypted or not. | |
1194 | */ | |
1195 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1196 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1197 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1198 | return true; | |
1199 | ||
1200 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1201 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1202 | return false; |
1203 | ||
1204 | return true; | |
1205 | } | |
1206 | ||
1207 | /* | |
1208 | * requires that rx->skb is a frame with ethernet header | |
1209 | */ | |
76ee65bf | 1210 | static void |
5cf121c3 | 1211 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1212 | { |
1213 | struct net_device *dev = rx->dev; | |
1214 | struct ieee80211_local *local = rx->local; | |
1215 | struct sk_buff *skb, *xmit_skb; | |
1216 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1217 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1218 | struct sta_info *dsta; | |
571ecf67 | 1219 | |
76ee65bf RR |
1220 | skb = rx->skb; |
1221 | xmit_skb = NULL; | |
571ecf67 | 1222 | |
05c914fe JB |
1223 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1224 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1225 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
5cf121c3 | 1226 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
ce3edf6d JB |
1227 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1228 | /* | |
1229 | * send multicast frames both to higher layers in | |
1230 | * local net stack and back to the wireless medium | |
1231 | */ | |
76ee65bf RR |
1232 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1233 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1234 | printk(KERN_DEBUG "%s: failed to clone " |
1235 | "multicast frame\n", dev->name); | |
1236 | } else { | |
571ecf67 | 1237 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1238 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1239 | /* |
1240 | * The destination station is associated to | |
1241 | * this AP (in this VLAN), so send the frame | |
1242 | * directly to it and do not pass it to local | |
1243 | * net stack. | |
571ecf67 | 1244 | */ |
76ee65bf | 1245 | xmit_skb = skb; |
571ecf67 JB |
1246 | skb = NULL; |
1247 | } | |
571ecf67 JB |
1248 | } |
1249 | } | |
1250 | ||
1251 | if (skb) { | |
1252 | /* deliver to local stack */ | |
1253 | skb->protocol = eth_type_trans(skb, dev); | |
1254 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1255 | netif_rx(skb); | |
1256 | } | |
1257 | ||
76ee65bf | 1258 | if (xmit_skb) { |
571ecf67 | 1259 | /* send to wireless media */ |
f831e909 | 1260 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1261 | skb_reset_network_header(xmit_skb); |
1262 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1263 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1264 | } |
76ee65bf RR |
1265 | } |
1266 | ||
49461622 | 1267 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1268 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f RR |
1269 | { |
1270 | struct net_device *dev = rx->dev; | |
1271 | struct ieee80211_local *local = rx->local; | |
358c8d9d | 1272 | u16 ethertype; |
fd4c7f2f RR |
1273 | u8 *payload; |
1274 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
358c8d9d HH |
1275 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1276 | __le16 fc = hdr->frame_control; | |
fd4c7f2f RR |
1277 | const struct ethhdr *eth; |
1278 | int remaining, err; | |
1279 | u8 dst[ETH_ALEN]; | |
1280 | u8 src[ETH_ALEN]; | |
fd4c7f2f | 1281 | |
358c8d9d | 1282 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1283 | return RX_CONTINUE; |
fd4c7f2f | 1284 | |
358c8d9d | 1285 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1286 | return RX_DROP_MONITOR; |
fd4c7f2f | 1287 | |
5cf121c3 | 1288 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1289 | return RX_CONTINUE; |
fd4c7f2f RR |
1290 | |
1291 | err = ieee80211_data_to_8023(rx); | |
1292 | if (unlikely(err)) | |
e4c26add | 1293 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1294 | |
1295 | skb->dev = dev; | |
1296 | ||
1297 | dev->stats.rx_packets++; | |
1298 | dev->stats.rx_bytes += skb->len; | |
1299 | ||
1300 | /* skip the wrapping header */ | |
1301 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1302 | if (!eth) | |
e4c26add | 1303 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1304 | |
1305 | while (skb != frame) { | |
1306 | u8 padding; | |
1307 | __be16 len = eth->h_proto; | |
1308 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1309 | ||
1310 | remaining = skb->len; | |
1311 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1312 | memcpy(src, eth->h_source, ETH_ALEN); | |
1313 | ||
1314 | padding = ((4 - subframe_len) & 0x3); | |
1315 | /* the last MSDU has no padding */ | |
f4ea83dd | 1316 | if (subframe_len > remaining) |
e4c26add | 1317 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1318 | |
1319 | skb_pull(skb, sizeof(struct ethhdr)); | |
1320 | /* if last subframe reuse skb */ | |
1321 | if (remaining <= subframe_len + padding) | |
1322 | frame = skb; | |
1323 | else { | |
1324 | frame = dev_alloc_skb(local->hw.extra_tx_headroom + | |
1325 | subframe_len); | |
1326 | ||
1327 | if (frame == NULL) | |
e4c26add | 1328 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1329 | |
1330 | skb_reserve(frame, local->hw.extra_tx_headroom + | |
1331 | sizeof(struct ethhdr)); | |
1332 | memcpy(skb_put(frame, ntohs(len)), skb->data, | |
1333 | ntohs(len)); | |
1334 | ||
1335 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1336 | padding); | |
1337 | if (!eth) { | |
fd4c7f2f | 1338 | dev_kfree_skb(frame); |
e4c26add | 1339 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1340 | } |
1341 | } | |
1342 | ||
ce3edf6d | 1343 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1344 | frame->dev = dev; |
1345 | frame->priority = skb->priority; | |
1346 | rx->skb = frame; | |
1347 | ||
fd4c7f2f RR |
1348 | payload = frame->data; |
1349 | ethertype = (payload[6] << 8) | payload[7]; | |
1350 | ||
1351 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1352 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1353 | compare_ether_addr(payload, | |
1354 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1355 | /* remove RFC1042 or Bridge-Tunnel |
1356 | * encapsulation and replace EtherType */ | |
1357 | skb_pull(frame, 6); | |
1358 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1359 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1360 | } else { | |
ce3edf6d JB |
1361 | memcpy(skb_push(frame, sizeof(__be16)), |
1362 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1363 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1364 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1365 | } | |
1366 | ||
358c8d9d | 1367 | if (!ieee80211_frame_allowed(rx, fc)) { |
ce3edf6d | 1368 | if (skb == frame) /* last frame */ |
e4c26add | 1369 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1370 | dev_kfree_skb(frame); |
1371 | continue; | |
1372 | } | |
fd4c7f2f RR |
1373 | |
1374 | ieee80211_deliver_skb(rx); | |
1375 | } | |
1376 | ||
9ae54c84 | 1377 | return RX_QUEUED; |
fd4c7f2f RR |
1378 | } |
1379 | ||
bf94e17b | 1380 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1381 | static ieee80211_rx_result |
e32f85f7 LCC |
1382 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1383 | { | |
1384 | struct ieee80211_hdr *hdr; | |
1385 | struct ieee80211s_hdr *mesh_hdr; | |
1386 | unsigned int hdrlen; | |
1387 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
1388 | ||
1389 | hdr = (struct ieee80211_hdr *) skb->data; | |
1390 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1391 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1392 | ||
1393 | if (!ieee80211_is_data(hdr->frame_control)) | |
1394 | return RX_CONTINUE; | |
1395 | ||
1396 | if (!mesh_hdr->ttl) | |
1397 | /* illegal frame */ | |
1398 | return RX_DROP_MONITOR; | |
1399 | ||
79617dee Y |
1400 | if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){ |
1401 | struct ieee80211_sub_if_data *sdata; | |
1402 | struct mesh_path *mppath; | |
1403 | ||
1404 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1405 | rcu_read_lock(); | |
1406 | mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata); | |
1407 | if (!mppath) { | |
1408 | mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata); | |
1409 | } else { | |
1410 | spin_lock_bh(&mppath->state_lock); | |
1411 | mppath->exp_time = jiffies; | |
1412 | if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0) | |
1413 | memcpy(mppath->mpp, hdr->addr4, ETH_ALEN); | |
1414 | spin_unlock_bh(&mppath->state_lock); | |
1415 | } | |
1416 | rcu_read_unlock(); | |
1417 | } | |
1418 | ||
e32f85f7 LCC |
1419 | if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0) |
1420 | return RX_CONTINUE; | |
1421 | ||
1422 | mesh_hdr->ttl--; | |
1423 | ||
1424 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1425 | if (!mesh_hdr->ttl) | |
472dbc45 | 1426 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1427 | dropped_frames_ttl); |
1428 | else { | |
1429 | struct ieee80211_hdr *fwd_hdr; | |
1430 | fwd_skb = skb_copy(skb, GFP_ATOMIC); | |
1431 | ||
1432 | if (!fwd_skb && net_ratelimit()) | |
1433 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
1434 | rx->dev->name); | |
1435 | ||
1436 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
1437 | /* | |
1438 | * Save TA to addr1 to send TA a path error if a | |
1439 | * suitable next hop is not found | |
1440 | */ | |
1441 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN); | |
1442 | memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN); | |
1443 | fwd_skb->dev = rx->local->mdev; | |
1444 | fwd_skb->iif = rx->dev->ifindex; | |
1445 | dev_queue_xmit(fwd_skb); | |
1446 | } | |
1447 | } | |
1448 | ||
1449 | if (is_multicast_ether_addr(hdr->addr3) || | |
1450 | rx->dev->flags & IFF_PROMISC) | |
1451 | return RX_CONTINUE; | |
1452 | else | |
1453 | return RX_DROP_MONITOR; | |
1454 | } | |
bf94e17b | 1455 | #endif |
e32f85f7 | 1456 | |
49461622 | 1457 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1458 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1459 | { |
1460 | struct net_device *dev = rx->dev; | |
358c8d9d HH |
1461 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1462 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1463 | int err; |
76ee65bf | 1464 | |
358c8d9d | 1465 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1466 | return RX_CONTINUE; |
76ee65bf | 1467 | |
358c8d9d | 1468 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1469 | return RX_DROP_MONITOR; |
76ee65bf | 1470 | |
76ee65bf RR |
1471 | err = ieee80211_data_to_8023(rx); |
1472 | if (unlikely(err)) | |
e4c26add | 1473 | return RX_DROP_UNUSABLE; |
76ee65bf | 1474 | |
358c8d9d | 1475 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1476 | return RX_DROP_MONITOR; |
ce3edf6d | 1477 | |
76ee65bf RR |
1478 | rx->skb->dev = dev; |
1479 | ||
1480 | dev->stats.rx_packets++; | |
1481 | dev->stats.rx_bytes += rx->skb->len; | |
1482 | ||
1483 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1484 | |
9ae54c84 | 1485 | return RX_QUEUED; |
571ecf67 JB |
1486 | } |
1487 | ||
49461622 | 1488 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1489 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1490 | { |
1491 | struct ieee80211_local *local = rx->local; | |
1492 | struct ieee80211_hw *hw = &local->hw; | |
1493 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1494 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1495 | struct tid_ampdu_rx *tid_agg_rx; |
1496 | u16 start_seq_num; | |
1497 | u16 tid; | |
1498 | ||
a7767f95 | 1499 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1500 | return RX_CONTINUE; |
71364716 | 1501 | |
a7767f95 | 1502 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1503 | if (!rx->sta) |
9ae54c84 | 1504 | return RX_CONTINUE; |
71364716 | 1505 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1506 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1507 | != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1508 | return RX_CONTINUE; |
cee24a3e | 1509 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1510 | |
1511 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1512 | ||
1513 | /* reset session timer */ | |
1514 | if (tid_agg_rx->timeout) { | |
1515 | unsigned long expires = | |
1516 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
1517 | mod_timer(&tid_agg_rx->session_timer, expires); | |
1518 | } | |
1519 | ||
1520 | /* manage reordering buffer according to requested */ | |
1521 | /* sequence number */ | |
1522 | rcu_read_lock(); | |
1523 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, | |
1524 | start_seq_num, 1); | |
1525 | rcu_read_unlock(); | |
e4c26add | 1526 | return RX_DROP_UNUSABLE; |
71364716 RR |
1527 | } |
1528 | ||
9ae54c84 | 1529 | return RX_CONTINUE; |
71364716 RR |
1530 | } |
1531 | ||
de1ede7a JB |
1532 | static ieee80211_rx_result debug_noinline |
1533 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1534 | { | |
1535 | struct ieee80211_local *local = rx->local; | |
1536 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1537 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
1538 | int len = rx->skb->len; | |
1539 | ||
1540 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1541 | return RX_CONTINUE; | |
1542 | ||
1543 | if (!rx->sta) | |
1544 | return RX_DROP_MONITOR; | |
1545 | ||
1546 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) | |
1547 | return RX_DROP_MONITOR; | |
1548 | ||
1549 | /* all categories we currently handle have action_code */ | |
1550 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1551 | return RX_DROP_MONITOR; | |
1552 | ||
de1ede7a JB |
1553 | switch (mgmt->u.action.category) { |
1554 | case WLAN_CATEGORY_BACK: | |
1555 | switch (mgmt->u.action.u.addba_req.action_code) { | |
1556 | case WLAN_ACTION_ADDBA_REQ: | |
1557 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1558 | sizeof(mgmt->u.action.u.addba_req))) | |
1559 | return RX_DROP_MONITOR; | |
1560 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
1561 | break; | |
1562 | case WLAN_ACTION_ADDBA_RESP: | |
1563 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1564 | sizeof(mgmt->u.action.u.addba_resp))) | |
1565 | return RX_DROP_MONITOR; | |
1566 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); | |
1567 | break; | |
1568 | case WLAN_ACTION_DELBA: | |
1569 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1570 | sizeof(mgmt->u.action.u.delba))) | |
1571 | return RX_DROP_MONITOR; | |
1572 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); | |
1573 | break; | |
1574 | } | |
39192c0b JB |
1575 | break; |
1576 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1577 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
1578 | return RX_DROP_MONITOR; | |
1579 | switch (mgmt->u.action.u.measurement.action_code) { | |
1580 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1581 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1582 | sizeof(mgmt->u.action.u.measurement))) | |
1583 | return RX_DROP_MONITOR; | |
1584 | ieee80211_process_measurement_req(sdata, mgmt, len); | |
1585 | break; | |
1586 | } | |
1587 | break; | |
1588 | default: | |
1589 | return RX_CONTINUE; | |
de1ede7a JB |
1590 | } |
1591 | ||
39192c0b JB |
1592 | rx->sta->rx_packets++; |
1593 | dev_kfree_skb(rx->skb); | |
1594 | return RX_QUEUED; | |
de1ede7a JB |
1595 | } |
1596 | ||
49461622 | 1597 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1598 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 1599 | { |
759ef3eb | 1600 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 | 1601 | |
5cf121c3 | 1602 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1603 | return RX_DROP_MONITOR; |
571ecf67 | 1604 | |
472dbc45 JB |
1605 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1606 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status); | |
1607 | ||
05c914fe JB |
1608 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
1609 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
759ef3eb JB |
1610 | return RX_DROP_MONITOR; |
1611 | ||
1612 | if (sdata->flags & IEEE80211_SDATA_USERSPACE_MLME) | |
e4c26add | 1613 | return RX_DROP_MONITOR; |
f9d540ee | 1614 | |
759ef3eb | 1615 | ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status); |
9ae54c84 | 1616 | return RX_QUEUED; |
571ecf67 JB |
1617 | } |
1618 | ||
571ecf67 JB |
1619 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, |
1620 | struct ieee80211_hdr *hdr, | |
5cf121c3 | 1621 | struct ieee80211_rx_data *rx) |
571ecf67 | 1622 | { |
a7767f95 HH |
1623 | int keyidx; |
1624 | unsigned int hdrlen; | |
571ecf67 | 1625 | |
a7767f95 | 1626 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1627 | if (rx->skb->len >= hdrlen + 4) |
1628 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1629 | else | |
1630 | keyidx = -1; | |
1631 | ||
8944b79f | 1632 | if (!rx->sta) { |
aa0daf0e JB |
1633 | /* |
1634 | * Some hardware seem to generate incorrect Michael MIC | |
1635 | * reports; ignore them to avoid triggering countermeasures. | |
1636 | */ | |
571ecf67 JB |
1637 | goto ignore; |
1638 | } | |
1639 | ||
a7767f95 | 1640 | if (!ieee80211_has_protected(hdr->frame_control)) |
571ecf67 | 1641 | goto ignore; |
571ecf67 | 1642 | |
05c914fe | 1643 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
1644 | /* |
1645 | * APs with pairwise keys should never receive Michael MIC | |
1646 | * errors for non-zero keyidx because these are reserved for | |
1647 | * group keys and only the AP is sending real multicast | |
1648 | * frames in the BSS. | |
1649 | */ | |
eb063c17 | 1650 | goto ignore; |
571ecf67 JB |
1651 | } |
1652 | ||
a7767f95 HH |
1653 | if (!ieee80211_is_data(hdr->frame_control) && |
1654 | !ieee80211_is_auth(hdr->frame_control)) | |
571ecf67 | 1655 | goto ignore; |
571ecf67 | 1656 | |
f698d856 | 1657 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr); |
571ecf67 JB |
1658 | ignore: |
1659 | dev_kfree_skb(rx->skb); | |
1660 | rx->skb = NULL; | |
1661 | } | |
1662 | ||
5cf121c3 JB |
1663 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
1664 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) | |
3d30d949 MW |
1665 | { |
1666 | struct ieee80211_sub_if_data *sdata; | |
1667 | struct ieee80211_local *local = rx->local; | |
1668 | struct ieee80211_rtap_hdr { | |
1669 | struct ieee80211_radiotap_header hdr; | |
1670 | u8 flags; | |
1671 | u8 rate; | |
1672 | __le16 chan_freq; | |
1673 | __le16 chan_flags; | |
1674 | } __attribute__ ((packed)) *rthdr; | |
1675 | struct sk_buff *skb = rx->skb, *skb2; | |
1676 | struct net_device *prev_dev = NULL; | |
5cf121c3 | 1677 | struct ieee80211_rx_status *status = rx->status; |
3d30d949 | 1678 | |
5cf121c3 | 1679 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1680 | goto out_free_skb; |
1681 | ||
1682 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1683 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1684 | goto out_free_skb; | |
1685 | ||
1686 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1687 | memset(rthdr, 0, sizeof(*rthdr)); | |
1688 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1689 | rthdr->hdr.it_present = | |
1690 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1691 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1692 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1693 | ||
5cf121c3 | 1694 | rthdr->rate = rx->rate->bitrate / 5; |
3d30d949 MW |
1695 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1696 | ||
1697 | if (status->band == IEEE80211_BAND_5GHZ) | |
1698 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1699 | IEEE80211_CHAN_5GHZ); | |
1700 | else | |
1701 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1702 | IEEE80211_CHAN_2GHZ); | |
1703 | ||
1704 | skb_set_mac_header(skb, 0); | |
1705 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1706 | skb->pkt_type = PACKET_OTHERHOST; | |
1707 | skb->protocol = htons(ETH_P_802_2); | |
1708 | ||
1709 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1710 | if (!netif_running(sdata->dev)) | |
1711 | continue; | |
1712 | ||
05c914fe | 1713 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
1714 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
1715 | continue; | |
1716 | ||
1717 | if (prev_dev) { | |
1718 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1719 | if (skb2) { | |
1720 | skb2->dev = prev_dev; | |
1721 | netif_rx(skb2); | |
1722 | } | |
1723 | } | |
1724 | ||
1725 | prev_dev = sdata->dev; | |
1726 | sdata->dev->stats.rx_packets++; | |
1727 | sdata->dev->stats.rx_bytes += skb->len; | |
1728 | } | |
1729 | ||
1730 | if (prev_dev) { | |
1731 | skb->dev = prev_dev; | |
1732 | netif_rx(skb); | |
1733 | skb = NULL; | |
1734 | } else | |
1735 | goto out_free_skb; | |
1736 | ||
5cf121c3 | 1737 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
1738 | return; |
1739 | ||
1740 | out_free_skb: | |
1741 | dev_kfree_skb(skb); | |
1742 | } | |
1743 | ||
571ecf67 | 1744 | |
8944b79f | 1745 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1746 | struct ieee80211_rx_data *rx, |
8944b79f | 1747 | struct sk_buff *skb) |
58905290 | 1748 | { |
58905290 JB |
1749 | ieee80211_rx_result res = RX_DROP_MONITOR; |
1750 | ||
8944b79f JB |
1751 | rx->skb = skb; |
1752 | rx->sdata = sdata; | |
1753 | rx->dev = sdata->dev; | |
1754 | ||
e32f85f7 LCC |
1755 | #define CALL_RXH(rxh) \ |
1756 | do { \ | |
1757 | res = rxh(rx); \ | |
1758 | if (res != RX_CONTINUE) \ | |
1759 | goto rxh_done; \ | |
1760 | } while (0); | |
49461622 JB |
1761 | |
1762 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
1763 | CALL_RXH(ieee80211_rx_h_check) | |
1764 | CALL_RXH(ieee80211_rx_h_decrypt) | |
1765 | CALL_RXH(ieee80211_rx_h_sta_process) | |
1766 | CALL_RXH(ieee80211_rx_h_defragment) | |
1767 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
1768 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
1769 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
1770 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
1771 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 1772 | #ifdef CONFIG_MAC80211_MESH |
e32f85f7 LCC |
1773 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1774 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 1775 | #endif |
49461622 JB |
1776 | CALL_RXH(ieee80211_rx_h_data) |
1777 | CALL_RXH(ieee80211_rx_h_ctrl) | |
de1ede7a | 1778 | CALL_RXH(ieee80211_rx_h_action) |
49461622 JB |
1779 | CALL_RXH(ieee80211_rx_h_mgmt) |
1780 | ||
1781 | #undef CALL_RXH | |
1782 | ||
1783 | rxh_done: | |
58905290 JB |
1784 | switch (res) { |
1785 | case RX_DROP_MONITOR: | |
49461622 JB |
1786 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1787 | if (rx->sta) | |
1788 | rx->sta->rx_dropped++; | |
1789 | /* fall through */ | |
1790 | case RX_CONTINUE: | |
3d30d949 MW |
1791 | ieee80211_rx_cooked_monitor(rx); |
1792 | break; | |
58905290 | 1793 | case RX_DROP_UNUSABLE: |
49461622 JB |
1794 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1795 | if (rx->sta) | |
1796 | rx->sta->rx_dropped++; | |
58905290 JB |
1797 | dev_kfree_skb(rx->skb); |
1798 | break; | |
49461622 JB |
1799 | case RX_QUEUED: |
1800 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
1801 | break; | |
58905290 JB |
1802 | } |
1803 | } | |
1804 | ||
571ecf67 JB |
1805 | /* main receive path */ |
1806 | ||
23a24def | 1807 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1808 | u8 *bssid, struct ieee80211_rx_data *rx, |
23a24def JB |
1809 | struct ieee80211_hdr *hdr) |
1810 | { | |
1811 | int multicast = is_multicast_ether_addr(hdr->addr1); | |
1812 | ||
51fb61e7 | 1813 | switch (sdata->vif.type) { |
05c914fe | 1814 | case NL80211_IFTYPE_STATION: |
23a24def JB |
1815 | if (!bssid) |
1816 | return 0; | |
1817 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
5cf121c3 | 1818 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1819 | return 0; |
5cf121c3 | 1820 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1821 | } else if (!multicast && |
1822 | compare_ether_addr(sdata->dev->dev_addr, | |
1823 | hdr->addr1) != 0) { | |
4150c572 | 1824 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1825 | return 0; |
5cf121c3 | 1826 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1827 | } |
1828 | break; | |
05c914fe | 1829 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
1830 | if (!bssid) |
1831 | return 0; | |
a7767f95 | 1832 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 1833 | return 1; |
87291c02 | 1834 | } |
9d9bf77d | 1835 | else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { |
5cf121c3 | 1836 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1837 | return 0; |
5cf121c3 | 1838 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1839 | } else if (!multicast && |
1840 | compare_ether_addr(sdata->dev->dev_addr, | |
1841 | hdr->addr1) != 0) { | |
4150c572 | 1842 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1843 | return 0; |
5cf121c3 | 1844 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 1845 | } else if (!rx->sta) |
f698d856 | 1846 | rx->sta = ieee80211_ibss_add_sta(sdata, rx->skb, |
87291c02 VK |
1847 | bssid, hdr->addr2, |
1848 | BIT(rx->status->rate_idx)); | |
23a24def | 1849 | break; |
05c914fe | 1850 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 JB |
1851 | if (!multicast && |
1852 | compare_ether_addr(sdata->dev->dev_addr, | |
1853 | hdr->addr1) != 0) { | |
1854 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
1855 | return 0; | |
1856 | ||
5cf121c3 | 1857 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
1858 | } |
1859 | break; | |
05c914fe JB |
1860 | case NL80211_IFTYPE_AP_VLAN: |
1861 | case NL80211_IFTYPE_AP: | |
23a24def JB |
1862 | if (!bssid) { |
1863 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1864 | hdr->addr1)) | |
1865 | return 0; | |
1866 | } else if (!ieee80211_bssid_match(bssid, | |
1867 | sdata->dev->dev_addr)) { | |
5cf121c3 | 1868 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1869 | return 0; |
5cf121c3 | 1870 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 1871 | } |
23a24def | 1872 | break; |
05c914fe | 1873 | case NL80211_IFTYPE_WDS: |
a7767f95 | 1874 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
1875 | return 0; |
1876 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
1877 | return 0; | |
1878 | break; | |
05c914fe | 1879 | case NL80211_IFTYPE_MONITOR: |
fb1c1cd6 JB |
1880 | /* take everything */ |
1881 | break; | |
05c914fe JB |
1882 | case NL80211_IFTYPE_UNSPECIFIED: |
1883 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
1884 | /* should never get here */ |
1885 | WARN_ON(1); | |
1886 | break; | |
23a24def JB |
1887 | } |
1888 | ||
1889 | return 1; | |
1890 | } | |
1891 | ||
571ecf67 | 1892 | /* |
6368e4b1 RR |
1893 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
1894 | * be called with rcu_read_lock protection. | |
571ecf67 | 1895 | */ |
71ebb4aa RR |
1896 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
1897 | struct sk_buff *skb, | |
1898 | struct ieee80211_rx_status *status, | |
8318d78a | 1899 | struct ieee80211_rate *rate) |
571ecf67 JB |
1900 | { |
1901 | struct ieee80211_local *local = hw_to_local(hw); | |
1902 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 1903 | struct ieee80211_hdr *hdr; |
5cf121c3 | 1904 | struct ieee80211_rx_data rx; |
6368e4b1 | 1905 | int prepares; |
8e6f0032 JB |
1906 | struct ieee80211_sub_if_data *prev = NULL; |
1907 | struct sk_buff *skb_new; | |
1908 | u8 *bssid; | |
571ecf67 | 1909 | |
358c8d9d | 1910 | hdr = (struct ieee80211_hdr *)skb->data; |
571ecf67 JB |
1911 | memset(&rx, 0, sizeof(rx)); |
1912 | rx.skb = skb; | |
1913 | rx.local = local; | |
1914 | ||
5cf121c3 | 1915 | rx.status = status; |
5cf121c3 | 1916 | rx.rate = rate; |
72abd81b | 1917 | |
358c8d9d | 1918 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
571ecf67 | 1919 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 1920 | |
8944b79f JB |
1921 | rx.sta = sta_info_get(local, hdr->addr2); |
1922 | if (rx.sta) { | |
d0709a65 JB |
1923 | rx.sdata = rx.sta->sdata; |
1924 | rx.dev = rx.sta->sdata->dev; | |
b2e7771e | 1925 | } |
571ecf67 | 1926 | |
571ecf67 | 1927 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
8944b79f | 1928 | ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx); |
d0709a65 | 1929 | return; |
571ecf67 JB |
1930 | } |
1931 | ||
c2b13452 | 1932 | if (unlikely(local->sw_scanning || local->hw_scanning)) |
5cf121c3 | 1933 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 1934 | |
38f3714d JB |
1935 | ieee80211_parse_qos(&rx); |
1936 | ieee80211_verify_ip_alignment(&rx); | |
1937 | ||
571ecf67 JB |
1938 | skb = rx.skb; |
1939 | ||
79010420 | 1940 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
1941 | if (!netif_running(sdata->dev)) |
1942 | continue; | |
1943 | ||
05c914fe | 1944 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
1945 | continue; |
1946 | ||
51fb61e7 | 1947 | bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); |
5cf121c3 | 1948 | rx.flags |= IEEE80211_RX_RA_MATCH; |
6368e4b1 | 1949 | prepares = prepare_for_handlers(sdata, bssid, &rx, hdr); |
23a24def | 1950 | |
6368e4b1 | 1951 | if (!prepares) |
23a24def | 1952 | continue; |
8e6f0032 | 1953 | |
340e11f3 JB |
1954 | /* |
1955 | * frame is destined for this interface, but if it's not | |
1956 | * also for the previous one we handle that after the | |
1957 | * loop to avoid copying the SKB once too much | |
1958 | */ | |
1959 | ||
1960 | if (!prev) { | |
1961 | prev = sdata; | |
1962 | continue; | |
8e6f0032 | 1963 | } |
340e11f3 JB |
1964 | |
1965 | /* | |
1966 | * frame was destined for the previous interface | |
1967 | * so invoke RX handlers for it | |
1968 | */ | |
1969 | ||
1970 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
1971 | if (!skb_new) { | |
1972 | if (net_ratelimit()) | |
1973 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 1974 | "multicast frame for %s\n", |
dd1cd4c6 JB |
1975 | wiphy_name(local->hw.wiphy), |
1976 | prev->dev->name); | |
340e11f3 JB |
1977 | continue; |
1978 | } | |
8944b79f | 1979 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 1980 | prev = sdata; |
571ecf67 | 1981 | } |
a4b7d7bd | 1982 | if (prev) |
8944b79f | 1983 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
a4b7d7bd | 1984 | else |
8e6f0032 | 1985 | dev_kfree_skb(skb); |
571ecf67 | 1986 | } |
6368e4b1 | 1987 | |
b580781e RR |
1988 | #define SEQ_MODULO 0x1000 |
1989 | #define SEQ_MASK 0xfff | |
1990 | ||
1991 | static inline int seq_less(u16 sq1, u16 sq2) | |
1992 | { | |
c6a1fa12 | 1993 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); |
b580781e RR |
1994 | } |
1995 | ||
1996 | static inline u16 seq_inc(u16 sq) | |
1997 | { | |
c6a1fa12 | 1998 | return (sq + 1) & SEQ_MASK; |
b580781e RR |
1999 | } |
2000 | ||
2001 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
2002 | { | |
c6a1fa12 | 2003 | return (sq1 - sq2) & SEQ_MASK; |
b580781e RR |
2004 | } |
2005 | ||
2006 | ||
71364716 RR |
2007 | /* |
2008 | * As it function blongs to Rx path it must be called with | |
2009 | * the proper rcu_read_lock protection for its flow. | |
2010 | */ | |
c6a1fa12 JB |
2011 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
2012 | struct tid_ampdu_rx *tid_agg_rx, | |
2013 | struct sk_buff *skb, | |
2014 | u16 mpdu_seq_num, | |
2015 | int bar_req) | |
b580781e RR |
2016 | { |
2017 | struct ieee80211_local *local = hw_to_local(hw); | |
2018 | struct ieee80211_rx_status status; | |
2019 | u16 head_seq_num, buf_size; | |
2020 | int index; | |
8318d78a JB |
2021 | struct ieee80211_supported_band *sband; |
2022 | struct ieee80211_rate *rate; | |
b580781e RR |
2023 | |
2024 | buf_size = tid_agg_rx->buf_size; | |
2025 | head_seq_num = tid_agg_rx->head_seq_num; | |
2026 | ||
2027 | /* frame with out of date sequence number */ | |
2028 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
2029 | dev_kfree_skb(skb); | |
2030 | return 1; | |
2031 | } | |
2032 | ||
2033 | /* if frame sequence number exceeds our buffering window size or | |
2034 | * block Ack Request arrived - release stored frames */ | |
2035 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
2036 | /* new head to the ordering buffer */ | |
2037 | if (bar_req) | |
2038 | head_seq_num = mpdu_seq_num; | |
2039 | else | |
2040 | head_seq_num = | |
2041 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
2042 | /* release stored frames up to new head to stack */ | |
2043 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
2044 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2045 | tid_agg_rx->ssn) | |
2046 | % tid_agg_rx->buf_size; | |
2047 | ||
2048 | if (tid_agg_rx->reorder_buf[index]) { | |
2049 | /* release the reordered frames to stack */ | |
2050 | memcpy(&status, | |
2051 | tid_agg_rx->reorder_buf[index]->cb, | |
2052 | sizeof(status)); | |
8318d78a JB |
2053 | sband = local->hw.wiphy->bands[status.band]; |
2054 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e RR |
2055 | __ieee80211_rx_handle_packet(hw, |
2056 | tid_agg_rx->reorder_buf[index], | |
9e72ebd6 | 2057 | &status, rate); |
b580781e RR |
2058 | tid_agg_rx->stored_mpdu_num--; |
2059 | tid_agg_rx->reorder_buf[index] = NULL; | |
2060 | } | |
2061 | tid_agg_rx->head_seq_num = | |
2062 | seq_inc(tid_agg_rx->head_seq_num); | |
2063 | } | |
2064 | if (bar_req) | |
2065 | return 1; | |
2066 | } | |
2067 | ||
2068 | /* now the new frame is always in the range of the reordering */ | |
2069 | /* buffer window */ | |
2070 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
2071 | % tid_agg_rx->buf_size; | |
2072 | /* check if we already stored this frame */ | |
2073 | if (tid_agg_rx->reorder_buf[index]) { | |
2074 | dev_kfree_skb(skb); | |
2075 | return 1; | |
2076 | } | |
2077 | ||
2078 | /* if arrived mpdu is in the right order and nothing else stored */ | |
2079 | /* release it immediately */ | |
2080 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
2081 | tid_agg_rx->stored_mpdu_num == 0) { | |
2082 | tid_agg_rx->head_seq_num = | |
2083 | seq_inc(tid_agg_rx->head_seq_num); | |
2084 | return 0; | |
2085 | } | |
2086 | ||
2087 | /* put the frame in the reordering buffer */ | |
2088 | tid_agg_rx->reorder_buf[index] = skb; | |
2089 | tid_agg_rx->stored_mpdu_num++; | |
2090 | /* release the buffer until next missing frame */ | |
2091 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
2092 | % tid_agg_rx->buf_size; | |
2093 | while (tid_agg_rx->reorder_buf[index]) { | |
2094 | /* release the reordered frame back to stack */ | |
2095 | memcpy(&status, tid_agg_rx->reorder_buf[index]->cb, | |
2096 | sizeof(status)); | |
8318d78a JB |
2097 | sband = local->hw.wiphy->bands[status.band]; |
2098 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e | 2099 | __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index], |
9e72ebd6 | 2100 | &status, rate); |
b580781e RR |
2101 | tid_agg_rx->stored_mpdu_num--; |
2102 | tid_agg_rx->reorder_buf[index] = NULL; | |
2103 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2104 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2105 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2106 | } | |
2107 | return 1; | |
2108 | } | |
2109 | ||
71ebb4aa RR |
2110 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
2111 | struct sk_buff *skb) | |
b580781e RR |
2112 | { |
2113 | struct ieee80211_hw *hw = &local->hw; | |
2114 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2115 | struct sta_info *sta; | |
2116 | struct tid_ampdu_rx *tid_agg_rx; | |
87228f57 | 2117 | u16 sc; |
b580781e | 2118 | u16 mpdu_seq_num; |
182503ab | 2119 | u8 ret = 0; |
b580781e RR |
2120 | int tid; |
2121 | ||
2122 | sta = sta_info_get(local, hdr->addr2); | |
2123 | if (!sta) | |
2124 | return ret; | |
2125 | ||
b580781e RR |
2126 | /* filter the QoS data rx stream according to |
2127 | * STA/TID and check if this STA/TID is on aggregation */ | |
87228f57 | 2128 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
b580781e RR |
2129 | goto end_reorder; |
2130 | ||
238f74a2 | 2131 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
b580781e | 2132 | |
cee24a3e | 2133 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
b580781e RR |
2134 | goto end_reorder; |
2135 | ||
cee24a3e RR |
2136 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2137 | ||
2560b6e2 EG |
2138 | /* qos null data frames are excluded */ |
2139 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
b580781e RR |
2140 | goto end_reorder; |
2141 | ||
2142 | /* new un-ordered ampdu frame - process it */ | |
2143 | ||
2144 | /* reset session timer */ | |
2145 | if (tid_agg_rx->timeout) { | |
2146 | unsigned long expires = | |
2147 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
2148 | mod_timer(&tid_agg_rx->session_timer, expires); | |
2149 | } | |
2150 | ||
2151 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2152 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2153 | if (sc & IEEE80211_SCTL_FRAG) { | |
17741cdc | 2154 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
b580781e RR |
2155 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
2156 | ret = 1; | |
2157 | goto end_reorder; | |
2158 | } | |
2159 | ||
2160 | /* according to mpdu sequence number deal with reordering buffer */ | |
2161 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
2162 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, | |
2163 | mpdu_seq_num, 0); | |
d0709a65 | 2164 | end_reorder: |
b580781e RR |
2165 | return ret; |
2166 | } | |
2167 | ||
6368e4b1 RR |
2168 | /* |
2169 | * This is the receive path handler. It is called by a low level driver when an | |
2170 | * 802.11 MPDU is received from the hardware. | |
2171 | */ | |
2172 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2173 | struct ieee80211_rx_status *status) | |
2174 | { | |
2175 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2176 | struct ieee80211_rate *rate = NULL; |
2177 | struct ieee80211_supported_band *sband; | |
2178 | ||
2179 | if (status->band < 0 || | |
13d8fd2d | 2180 | status->band >= IEEE80211_NUM_BANDS) { |
8318d78a JB |
2181 | WARN_ON(1); |
2182 | return; | |
2183 | } | |
2184 | ||
2185 | sband = local->hw.wiphy->bands[status->band]; | |
2186 | ||
2187 | if (!sband || | |
2188 | status->rate_idx < 0 || | |
2189 | status->rate_idx >= sband->n_bitrates) { | |
2190 | WARN_ON(1); | |
2191 | return; | |
2192 | } | |
2193 | ||
2194 | rate = &sband->bitrates[status->rate_idx]; | |
6368e4b1 RR |
2195 | |
2196 | /* | |
2197 | * key references and virtual interfaces are protected using RCU | |
2198 | * and this requires that we are in a read-side RCU section during | |
2199 | * receive processing | |
2200 | */ | |
2201 | rcu_read_lock(); | |
2202 | ||
2203 | /* | |
2204 | * Frames with failed FCS/PLCP checksum are not returned, | |
2205 | * all other frames are returned without radiotap header | |
2206 | * if it was previously present. | |
2207 | * Also, frames with less than 16 bytes are dropped. | |
2208 | */ | |
8318d78a | 2209 | skb = ieee80211_rx_monitor(local, skb, status, rate); |
6368e4b1 RR |
2210 | if (!skb) { |
2211 | rcu_read_unlock(); | |
2212 | return; | |
2213 | } | |
2214 | ||
b580781e | 2215 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
9e72ebd6 | 2216 | __ieee80211_rx_handle_packet(hw, skb, status, rate); |
6368e4b1 RR |
2217 | |
2218 | rcu_read_unlock(); | |
2219 | } | |
571ecf67 JB |
2220 | EXPORT_SYMBOL(__ieee80211_rx); |
2221 | ||
2222 | /* This is a version of the rx handler that can be called from hard irq | |
2223 | * context. Post the skb on the queue and schedule the tasklet */ | |
2224 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2225 | struct ieee80211_rx_status *status) | |
2226 | { | |
2227 | struct ieee80211_local *local = hw_to_local(hw); | |
2228 | ||
2229 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2230 | ||
2231 | skb->dev = local->mdev; | |
2232 | /* copy status into skb->cb for use by tasklet */ | |
2233 | memcpy(skb->cb, status, sizeof(*status)); | |
2234 | skb->pkt_type = IEEE80211_RX_MSG; | |
2235 | skb_queue_tail(&local->skb_queue, skb); | |
2236 | tasklet_schedule(&local->tasklet); | |
2237 | } | |
2238 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |