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 | ||
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 | { | |
182503ab | 64 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b2e7771e JB |
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; | |
87228f57 HH |
70 | if (ieee80211_is_ctl(hdr->frame_control) && |
71 | !ieee80211_is_pspoll(hdr->frame_control) && | |
72 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
73 | return 1; |
74 | return 0; | |
75 | } | |
76 | ||
601ae7f2 BR |
77 | static int |
78 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
79 | struct ieee80211_rx_status *status) | |
80 | { | |
81 | int len; | |
82 | ||
83 | /* always present fields */ | |
84 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
85 | ||
86 | if (status->flag & RX_FLAG_TSFT) | |
87 | len += 8; | |
88 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DB || | |
89 | local->hw.flags & IEEE80211_HW_SIGNAL_DBM) | |
90 | len += 1; | |
91 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) | |
92 | len += 1; | |
93 | ||
94 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
95 | len++; | |
96 | ||
97 | /* make sure radiotap starts at a naturally aligned address */ | |
98 | if (len % 8) | |
99 | len = roundup(len, 8); | |
100 | ||
101 | return len; | |
102 | } | |
103 | ||
104 | /** | |
105 | * ieee80211_add_rx_radiotap_header - add radiotap header | |
106 | * | |
107 | * add a radiotap header containing all the fields which the hardware provided. | |
108 | */ | |
109 | static void | |
110 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
111 | struct sk_buff *skb, | |
112 | struct ieee80211_rx_status *status, | |
113 | struct ieee80211_rate *rate, | |
114 | int rtap_len) | |
115 | { | |
116 | struct ieee80211_radiotap_header *rthdr; | |
117 | unsigned char *pos; | |
118 | ||
119 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
120 | memset(rthdr, 0, rtap_len); | |
121 | ||
122 | /* radiotap header, set always present flags */ | |
123 | rthdr->it_present = | |
124 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
125 | (1 << IEEE80211_RADIOTAP_RATE) | | |
126 | (1 << IEEE80211_RADIOTAP_CHANNEL) | | |
127 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
128 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
129 | rthdr->it_len = cpu_to_le16(rtap_len); | |
130 | ||
131 | pos = (unsigned char *)(rthdr+1); | |
132 | ||
133 | /* the order of the following fields is important */ | |
134 | ||
135 | /* IEEE80211_RADIOTAP_TSFT */ | |
136 | if (status->flag & RX_FLAG_TSFT) { | |
137 | *(__le64 *)pos = cpu_to_le64(status->mactime); | |
138 | rthdr->it_present |= | |
139 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
140 | pos += 8; | |
141 | } | |
142 | ||
143 | /* IEEE80211_RADIOTAP_FLAGS */ | |
144 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
145 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
146 | pos++; | |
147 | ||
148 | /* IEEE80211_RADIOTAP_RATE */ | |
149 | *pos = rate->bitrate / 5; | |
150 | pos++; | |
151 | ||
152 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
153 | *(__le16 *)pos = cpu_to_le16(status->freq); | |
154 | pos += 2; | |
155 | if (status->band == IEEE80211_BAND_5GHZ) | |
156 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
157 | IEEE80211_CHAN_5GHZ); | |
158 | else | |
159 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_DYN | | |
160 | IEEE80211_CHAN_2GHZ); | |
161 | pos += 2; | |
162 | ||
163 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
164 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
165 | *pos = status->signal; | |
166 | rthdr->it_present |= | |
167 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
168 | pos++; | |
169 | } | |
170 | ||
171 | /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ | |
172 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { | |
173 | *pos = status->noise; | |
174 | rthdr->it_present |= | |
175 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); | |
176 | pos++; | |
177 | } | |
178 | ||
179 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ | |
180 | ||
181 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
182 | *pos = status->antenna; | |
183 | pos++; | |
184 | ||
185 | /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */ | |
186 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) { | |
187 | *pos = status->signal; | |
188 | rthdr->it_present |= | |
189 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL); | |
190 | pos++; | |
191 | } | |
192 | ||
193 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ | |
194 | ||
195 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
196 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
197 | if ((pos - (unsigned char *)rthdr) & 1) | |
198 | pos++; | |
199 | /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */ | |
200 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
201 | *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS); | |
202 | pos += 2; | |
203 | } | |
204 | ||
b2e7771e JB |
205 | /* |
206 | * This function copies a received frame to all monitor interfaces and | |
207 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
208 | * radiotap header the driver might have added. | |
209 | */ | |
210 | static struct sk_buff * | |
211 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a JB |
212 | struct ieee80211_rx_status *status, |
213 | struct ieee80211_rate *rate) | |
b2e7771e JB |
214 | { |
215 | struct ieee80211_sub_if_data *sdata; | |
b2e7771e | 216 | int needed_headroom = 0; |
b2e7771e JB |
217 | struct sk_buff *skb, *skb2; |
218 | struct net_device *prev_dev = NULL; | |
219 | int present_fcs_len = 0; | |
220 | int rtap_len = 0; | |
221 | ||
222 | /* | |
223 | * First, we may need to make a copy of the skb because | |
224 | * (1) we need to modify it for radiotap (if not present), and | |
225 | * (2) the other RX handlers will modify the skb we got. | |
226 | * | |
227 | * We don't need to, of course, if we aren't going to return | |
228 | * the SKB because it has a bad FCS/PLCP checksum. | |
229 | */ | |
230 | if (status->flag & RX_FLAG_RADIOTAP) | |
231 | rtap_len = ieee80211_get_radiotap_len(origskb->data); | |
232 | else | |
601ae7f2 BR |
233 | /* room for the radiotap header based on driver features */ |
234 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
235 | |
236 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
237 | present_fcs_len = FCS_LEN; | |
238 | ||
239 | if (!local->monitors) { | |
240 | if (should_drop_frame(status, origskb, present_fcs_len, | |
241 | rtap_len)) { | |
242 | dev_kfree_skb(origskb); | |
243 | return NULL; | |
244 | } | |
245 | ||
246 | return remove_monitor_info(local, origskb, rtap_len); | |
247 | } | |
248 | ||
249 | if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) { | |
250 | /* only need to expand headroom if necessary */ | |
251 | skb = origskb; | |
252 | origskb = NULL; | |
253 | ||
254 | /* | |
255 | * This shouldn't trigger often because most devices have an | |
256 | * RX header they pull before we get here, and that should | |
257 | * be big enough for our radiotap information. We should | |
258 | * probably export the length to drivers so that we can have | |
259 | * them allocate enough headroom to start with. | |
260 | */ | |
261 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 262 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
263 | dev_kfree_skb(skb); |
264 | return NULL; | |
265 | } | |
266 | } else { | |
267 | /* | |
268 | * Need to make a copy and possibly remove radiotap header | |
269 | * and FCS from the original. | |
270 | */ | |
271 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
272 | ||
273 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
274 | ||
275 | if (!skb) | |
276 | return origskb; | |
277 | } | |
278 | ||
279 | /* if necessary, prepend radiotap information */ | |
601ae7f2 BR |
280 | if (!(status->flag & RX_FLAG_RADIOTAP)) |
281 | ieee80211_add_rx_radiotap_header(local, skb, status, rate, | |
282 | needed_headroom); | |
b2e7771e | 283 | |
ce3edf6d | 284 | skb_reset_mac_header(skb); |
b2e7771e JB |
285 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
286 | skb->pkt_type = PACKET_OTHERHOST; | |
287 | skb->protocol = htons(ETH_P_802_2); | |
288 | ||
289 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
290 | if (!netif_running(sdata->dev)) | |
291 | continue; | |
292 | ||
51fb61e7 | 293 | if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR) |
b2e7771e JB |
294 | continue; |
295 | ||
3d30d949 MW |
296 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
297 | continue; | |
298 | ||
b2e7771e JB |
299 | if (prev_dev) { |
300 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
301 | if (skb2) { | |
302 | skb2->dev = prev_dev; | |
303 | netif_rx(skb2); | |
304 | } | |
305 | } | |
306 | ||
307 | prev_dev = sdata->dev; | |
308 | sdata->dev->stats.rx_packets++; | |
309 | sdata->dev->stats.rx_bytes += skb->len; | |
310 | } | |
311 | ||
312 | if (prev_dev) { | |
313 | skb->dev = prev_dev; | |
314 | netif_rx(skb); | |
315 | } else | |
316 | dev_kfree_skb(skb); | |
317 | ||
318 | return origskb; | |
319 | } | |
320 | ||
321 | ||
5cf121c3 | 322 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 323 | { |
238f74a2 | 324 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
325 | int tid; |
326 | ||
327 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
328 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
329 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 330 | /* frame has qos control */ |
238f74a2 HH |
331 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
332 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 333 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 334 | else |
5cf121c3 | 335 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 336 | } else { |
238f74a2 | 337 | if (unlikely(ieee80211_is_mgmt(hdr->frame_control))) { |
6e0d114d JB |
338 | /* Separate TID for management frames */ |
339 | tid = NUM_RX_DATA_QUEUES - 1; | |
340 | } else { | |
341 | /* no qos control present */ | |
342 | tid = 0; /* 802.1d - Best Effort */ | |
343 | } | |
344 | } | |
52865dfd | 345 | |
5cf121c3 | 346 | rx->queue = tid; |
6e0d114d JB |
347 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
348 | * For now, set skb->priority to 0 for other cases. */ | |
349 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 350 | } |
6e0d114d | 351 | |
5cf121c3 | 352 | static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx) |
38f3714d JB |
353 | { |
354 | #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT | |
a7767f95 | 355 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
38f3714d JB |
356 | int hdrlen; |
357 | ||
a7767f95 | 358 | if (!ieee80211_is_data_present(hdr->frame_control)) |
38f3714d JB |
359 | return; |
360 | ||
361 | /* | |
362 | * Drivers are required to align the payload data in a way that | |
363 | * guarantees that the contained IP header is aligned to a four- | |
364 | * byte boundary. In the case of regular frames, this simply means | |
365 | * aligning the payload to a four-byte boundary (because either | |
366 | * the IP header is directly contained, or IV/RFC1042 headers that | |
367 | * have a length divisible by four are in front of it. | |
368 | * | |
369 | * With A-MSDU frames, however, the payload data address must | |
370 | * yield two modulo four because there are 14-byte 802.3 headers | |
371 | * within the A-MSDU frames that push the IP header further back | |
372 | * to a multiple of four again. Thankfully, the specs were sane | |
373 | * enough this time around to require padding each A-MSDU subframe | |
374 | * to a length that is a multiple of four. | |
375 | * | |
376 | * Padding like atheros hardware adds which is inbetween the 802.11 | |
377 | * header and the payload is not supported, the driver is required | |
378 | * to move the 802.11 header further back in that case. | |
379 | */ | |
a7767f95 | 380 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
5cf121c3 | 381 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d JB |
382 | hdrlen += ETH_HLEN; |
383 | WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3); | |
384 | #endif | |
6e0d114d JB |
385 | } |
386 | ||
6368e4b1 | 387 | |
571ecf67 JB |
388 | /* rx handlers */ |
389 | ||
49461622 | 390 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 391 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
392 | { |
393 | struct ieee80211_local *local = rx->local; | |
394 | struct sk_buff *skb = rx->skb; | |
395 | ||
ece8eddd | 396 | if (unlikely(local->sta_hw_scanning)) |
5cf121c3 | 397 | return ieee80211_sta_rx_scan(rx->dev, skb, rx->status); |
ece8eddd ZY |
398 | |
399 | if (unlikely(local->sta_sw_scanning)) { | |
400 | /* drop all the other packets during a software scan anyway */ | |
5cf121c3 | 401 | if (ieee80211_sta_rx_scan(rx->dev, skb, rx->status) |
9ae54c84 | 402 | != RX_QUEUED) |
ece8eddd | 403 | dev_kfree_skb(skb); |
9ae54c84 | 404 | return RX_QUEUED; |
571ecf67 JB |
405 | } |
406 | ||
5cf121c3 | 407 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
408 | /* scanning finished during invoking of handlers */ |
409 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 410 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
411 | } |
412 | ||
9ae54c84 | 413 | return RX_CONTINUE; |
571ecf67 JB |
414 | } |
415 | ||
33b64eb2 | 416 | static ieee80211_rx_result |
5cf121c3 | 417 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 418 | { |
a7767f95 HH |
419 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
420 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
d6d1a5a7 | 421 | |
a7767f95 HH |
422 | if (ieee80211_is_data(hdr->frame_control)) { |
423 | if (!ieee80211_has_a4(hdr->frame_control)) | |
33b64eb2 LCC |
424 | return RX_DROP_MONITOR; |
425 | if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0) | |
426 | return RX_DROP_MONITOR; | |
427 | } | |
428 | ||
429 | /* If there is not an established peer link and this is not a peer link | |
430 | * establisment frame, beacon or probe, drop the frame. | |
431 | */ | |
432 | ||
b4e08ea1 | 433 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 434 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 435 | |
a7767f95 | 436 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
437 | return RX_DROP_MONITOR; |
438 | ||
a7767f95 | 439 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 LCC |
440 | mgmt = (struct ieee80211_mgmt *)hdr; |
441 | if (mgmt->u.action.category != PLINK_CATEGORY) | |
442 | return RX_DROP_MONITOR; | |
33b64eb2 | 443 | return RX_CONTINUE; |
33b64eb2 LCC |
444 | } |
445 | ||
a7767f95 HH |
446 | if (ieee80211_is_probe_req(hdr->frame_control) || |
447 | ieee80211_is_probe_resp(hdr->frame_control) || | |
448 | ieee80211_is_beacon(hdr->frame_control)) | |
449 | return RX_CONTINUE; | |
450 | ||
451 | return RX_DROP_MONITOR; | |
452 | ||
453 | } | |
454 | ||
455 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
456 | ||
457 | if (ieee80211_is_data(hdr->frame_control) && | |
458 | is_multicast_ether_addr(hdr->addr1) && | |
459 | mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->dev)) | |
33b64eb2 | 460 | return RX_DROP_MONITOR; |
902acc78 | 461 | #undef msh_h_get |
d6d1a5a7 | 462 | |
902acc78 JB |
463 | return RX_CONTINUE; |
464 | } | |
33b64eb2 LCC |
465 | |
466 | ||
49461622 | 467 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 468 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 469 | { |
a7767f95 | 470 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
471 | |
472 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
473 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 474 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 475 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 476 | hdr->seq_ctrl)) { |
5cf121c3 | 477 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
478 | rx->local->dot11FrameDuplicateCount++; |
479 | rx->sta->num_duplicates++; | |
480 | } | |
e4c26add | 481 | return RX_DROP_MONITOR; |
571ecf67 | 482 | } else |
5cf121c3 | 483 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
484 | } |
485 | ||
571ecf67 JB |
486 | if (unlikely(rx->skb->len < 16)) { |
487 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 488 | return RX_DROP_MONITOR; |
571ecf67 JB |
489 | } |
490 | ||
571ecf67 JB |
491 | /* Drop disallowed frame classes based on STA auth/assoc state; |
492 | * IEEE 802.11, Chap 5.5. | |
493 | * | |
494 | * 80211.o does filtering only based on association state, i.e., it | |
495 | * drops Class 3 frames from not associated stations. hostapd sends | |
496 | * deauth/disassoc frames when needed. In addition, hostapd is | |
497 | * responsible for filtering on both auth and assoc states. | |
498 | */ | |
33b64eb2 | 499 | |
902acc78 | 500 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 501 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 502 | |
a7767f95 HH |
503 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
504 | ieee80211_is_pspoll(hdr->frame_control)) && | |
51fb61e7 | 505 | rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS && |
07346f81 | 506 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
507 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
508 | !ieee80211_has_tods(hdr->frame_control) && | |
509 | ieee80211_is_data(hdr->frame_control)) || | |
510 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
511 | /* Drop IBSS frames and frames for other hosts |
512 | * silently. */ | |
e4c26add | 513 | return RX_DROP_MONITOR; |
571ecf67 JB |
514 | } |
515 | ||
e4c26add | 516 | return RX_DROP_MONITOR; |
571ecf67 JB |
517 | } |
518 | ||
9ae54c84 | 519 | return RX_CONTINUE; |
570bd537 JB |
520 | } |
521 | ||
522 | ||
49461622 | 523 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 524 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 525 | { |
a7767f95 | 526 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
3017b80b JB |
527 | int keyidx; |
528 | int hdrlen; | |
e4c26add | 529 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 530 | struct ieee80211_key *stakey = NULL; |
570bd537 | 531 | |
3017b80b JB |
532 | /* |
533 | * Key selection 101 | |
534 | * | |
535 | * There are three types of keys: | |
536 | * - GTK (group keys) | |
537 | * - PTK (pairwise keys) | |
538 | * - STK (station-to-station pairwise keys) | |
539 | * | |
540 | * When selecting a key, we have to distinguish between multicast | |
541 | * (including broadcast) and unicast frames, the latter can only | |
542 | * use PTKs and STKs while the former always use GTKs. Unless, of | |
543 | * course, actual WEP keys ("pre-RSNA") are used, then unicast | |
544 | * frames can also use key indizes like GTKs. Hence, if we don't | |
545 | * have a PTK/STK we check the key index for a WEP key. | |
546 | * | |
8dc06a1c JB |
547 | * Note that in a regular BSS, multicast frames are sent by the |
548 | * AP only, associated stations unicast the frame to the AP first | |
549 | * which then multicasts it on their behalf. | |
550 | * | |
3017b80b JB |
551 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
552 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
553 | * The spec seems to expect that one negotiates the same key with |
554 | * every station but there's no such requirement; VLANs could be | |
555 | * possible. | |
3017b80b JB |
556 | */ |
557 | ||
a7767f95 | 558 | if (!ieee80211_has_protected(hdr->frame_control)) |
9ae54c84 | 559 | return RX_CONTINUE; |
571ecf67 | 560 | |
3017b80b | 561 | /* |
1990af8d | 562 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
563 | * addressed to us nor a multicast frame. |
564 | */ | |
5cf121c3 | 565 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 566 | return RX_CONTINUE; |
3017b80b | 567 | |
d4e46a3d JB |
568 | if (rx->sta) |
569 | stakey = rcu_dereference(rx->sta->key); | |
570 | ||
571 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { | |
572 | rx->key = stakey; | |
571ecf67 | 573 | } else { |
3017b80b JB |
574 | /* |
575 | * The device doesn't give us the IV so we won't be | |
576 | * able to look up the key. That's ok though, we | |
577 | * don't need to decrypt the frame, we just won't | |
578 | * be able to keep statistics accurate. | |
579 | * Except for key threshold notifications, should | |
580 | * we somehow allow the driver to tell us which key | |
581 | * the hardware used if this flag is set? | |
582 | */ | |
5cf121c3 JB |
583 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
584 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 585 | return RX_CONTINUE; |
3017b80b | 586 | |
a7767f95 | 587 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
588 | |
589 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 590 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
591 | |
592 | /* | |
593 | * no need to call ieee80211_wep_get_keyidx, | |
594 | * it verifies a bunch of things we've done already | |
595 | */ | |
596 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
597 | ||
d4e46a3d | 598 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
599 | |
600 | /* | |
601 | * RSNA-protected unicast frames should always be sent with | |
602 | * pairwise or station-to-station keys, but for WEP we allow | |
603 | * using a key index as well. | |
604 | */ | |
8f20fc24 | 605 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
606 | !is_multicast_ether_addr(hdr->addr1)) |
607 | rx->key = NULL; | |
571ecf67 JB |
608 | } |
609 | ||
3017b80b | 610 | if (rx->key) { |
571ecf67 | 611 | rx->key->tx_rx_count++; |
011bfcc4 | 612 | /* TODO: add threshold stuff again */ |
1990af8d | 613 | } else { |
e4c26add | 614 | return RX_DROP_MONITOR; |
70f08765 JB |
615 | } |
616 | ||
1990af8d JB |
617 | /* Check for weak IVs if possible */ |
618 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 619 | ieee80211_is_data(hdr->frame_control) && |
5cf121c3 JB |
620 | (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
621 | !(rx->status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
622 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
623 | rx->sta->wep_weak_iv_count++; | |
624 | ||
70f08765 JB |
625 | switch (rx->key->conf.alg) { |
626 | case ALG_WEP: | |
e2f036da MN |
627 | result = ieee80211_crypto_wep_decrypt(rx); |
628 | break; | |
70f08765 | 629 | case ALG_TKIP: |
e2f036da MN |
630 | result = ieee80211_crypto_tkip_decrypt(rx); |
631 | break; | |
70f08765 | 632 | case ALG_CCMP: |
e2f036da MN |
633 | result = ieee80211_crypto_ccmp_decrypt(rx); |
634 | break; | |
70f08765 JB |
635 | } |
636 | ||
e2f036da | 637 | /* either the frame has been decrypted or will be dropped */ |
5cf121c3 | 638 | rx->status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
639 | |
640 | return result; | |
70f08765 JB |
641 | } |
642 | ||
571ecf67 JB |
643 | static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta) |
644 | { | |
645 | struct ieee80211_sub_if_data *sdata; | |
0795af57 JP |
646 | DECLARE_MAC_BUF(mac); |
647 | ||
d0709a65 | 648 | sdata = sta->sdata; |
571ecf67 JB |
649 | |
650 | if (sdata->bss) | |
651 | atomic_inc(&sdata->bss->num_sta_ps); | |
07346f81 | 652 | set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL); |
571ecf67 | 653 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0795af57 JP |
654 | printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n", |
655 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 JB |
656 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
657 | } | |
658 | ||
659 | static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta) | |
660 | { | |
661 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
662 | struct sk_buff *skb; | |
663 | int sent = 0; | |
664 | struct ieee80211_sub_if_data *sdata; | |
e039fa4a | 665 | struct ieee80211_tx_info *info; |
0795af57 | 666 | DECLARE_MAC_BUF(mac); |
571ecf67 | 667 | |
d0709a65 | 668 | sdata = sta->sdata; |
004c872e | 669 | |
571ecf67 JB |
670 | if (sdata->bss) |
671 | atomic_dec(&sdata->bss->num_sta_ps); | |
004c872e | 672 | |
07346f81 | 673 | clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL); |
004c872e JB |
674 | |
675 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
676 | sta_info_clear_tim_bit(sta); | |
677 | ||
571ecf67 | 678 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0795af57 JP |
679 | printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n", |
680 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 | 681 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 682 | |
571ecf67 JB |
683 | /* Send all buffered frames to the station */ |
684 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
e039fa4a | 685 | info = IEEE80211_SKB_CB(skb); |
571ecf67 | 686 | sent++; |
e039fa4a | 687 | info->flags |= IEEE80211_TX_CTL_REQUEUE; |
571ecf67 JB |
688 | dev_queue_xmit(skb); |
689 | } | |
690 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
e039fa4a | 691 | info = IEEE80211_SKB_CB(skb); |
571ecf67 JB |
692 | local->total_ps_buffered--; |
693 | sent++; | |
694 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 | 695 | printk(KERN_DEBUG "%s: STA %s aid %d send PS frame " |
571ecf67 | 696 | "since STA not sleeping anymore\n", dev->name, |
0795af57 | 697 | print_mac(mac, sta->addr), sta->aid); |
571ecf67 | 698 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
e039fa4a | 699 | info->flags |= IEEE80211_TX_CTL_REQUEUE; |
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; | |
710 | struct net_device *dev = rx->dev; | |
a7767f95 | 711 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
712 | |
713 | if (!sta) | |
9ae54c84 | 714 | return RX_CONTINUE; |
571ecf67 JB |
715 | |
716 | /* Update last_rx only for IBSS packets which are for the current | |
717 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
718 | * other STAs are using different BSSID. */ | |
51fb61e7 | 719 | if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) { |
71364716 RR |
720 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
721 | IEEE80211_IF_TYPE_IBSS); | |
571ecf67 JB |
722 | if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0) |
723 | sta->last_rx = jiffies; | |
724 | } else | |
725 | if (!is_multicast_ether_addr(hdr->addr1) || | |
51fb61e7 | 726 | rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) { |
571ecf67 JB |
727 | /* Update last_rx only for unicast frames in order to prevent |
728 | * the Probe Request frames (the only broadcast frames from a | |
729 | * STA in infrastructure mode) from keeping a connection alive. | |
33b64eb2 LCC |
730 | * Mesh beacons will update last_rx when if they are found to |
731 | * match the current local configuration when processed. | |
571ecf67 JB |
732 | */ |
733 | sta->last_rx = jiffies; | |
734 | } | |
735 | ||
5cf121c3 | 736 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 737 | return RX_CONTINUE; |
571ecf67 JB |
738 | |
739 | sta->rx_fragments++; | |
740 | sta->rx_bytes += rx->skb->len; | |
5cf121c3 | 741 | sta->last_signal = rx->status->signal; |
566bfe5a | 742 | sta->last_qual = rx->status->qual; |
5cf121c3 | 743 | sta->last_noise = rx->status->noise; |
571ecf67 | 744 | |
a7767f95 | 745 | if (!ieee80211_has_morefrags(hdr->frame_control)) { |
571ecf67 JB |
746 | /* Change STA power saving mode only in the end of a frame |
747 | * exchange sequence */ | |
07346f81 | 748 | if (test_sta_flags(sta, WLAN_STA_PS) && |
a7767f95 | 749 | !ieee80211_has_pm(hdr->frame_control)) |
5cf121c3 | 750 | rx->sent_ps_buffered += ap_sta_ps_end(dev, sta); |
07346f81 | 751 | else if (!test_sta_flags(sta, WLAN_STA_PS) && |
a7767f95 | 752 | ieee80211_has_pm(hdr->frame_control)) |
571ecf67 JB |
753 | ap_sta_ps_start(dev, sta); |
754 | } | |
755 | ||
756 | /* Drop data::nullfunc frames silently, since they are used only to | |
757 | * control station power saving mode. */ | |
a7767f95 | 758 | if (ieee80211_is_nullfunc(hdr->frame_control)) { |
571ecf67 JB |
759 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
760 | /* Update counter and free packet here to avoid counting this | |
761 | * as a dropped packed. */ | |
762 | sta->rx_packets++; | |
763 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 764 | return RX_QUEUED; |
571ecf67 JB |
765 | } |
766 | ||
9ae54c84 | 767 | return RX_CONTINUE; |
571ecf67 JB |
768 | } /* ieee80211_rx_h_sta_process */ |
769 | ||
571ecf67 JB |
770 | static inline struct ieee80211_fragment_entry * |
771 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
772 | unsigned int frag, unsigned int seq, int rx_queue, | |
773 | struct sk_buff **skb) | |
774 | { | |
775 | struct ieee80211_fragment_entry *entry; | |
776 | int idx; | |
777 | ||
778 | idx = sdata->fragment_next; | |
779 | entry = &sdata->fragments[sdata->fragment_next++]; | |
780 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
781 | sdata->fragment_next = 0; | |
782 | ||
783 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 784 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
785 | struct ieee80211_hdr *hdr = |
786 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
0795af57 JP |
787 | DECLARE_MAC_BUF(mac); |
788 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
789 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " |
790 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0795af57 | 791 | "addr1=%s addr2=%s\n", |
571ecf67 JB |
792 | sdata->dev->name, idx, |
793 | jiffies - entry->first_frag_time, entry->seq, | |
0795af57 JP |
794 | entry->last_frag, print_mac(mac, hdr->addr1), |
795 | print_mac(mac2, hdr->addr2)); | |
f4ea83dd | 796 | #endif |
571ecf67 JB |
797 | __skb_queue_purge(&entry->skb_list); |
798 | } | |
799 | ||
800 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
801 | *skb = NULL; | |
802 | entry->first_frag_time = jiffies; | |
803 | entry->seq = seq; | |
804 | entry->rx_queue = rx_queue; | |
805 | entry->last_frag = frag; | |
806 | entry->ccmp = 0; | |
807 | entry->extra_len = 0; | |
808 | ||
809 | return entry; | |
810 | } | |
811 | ||
812 | static inline struct ieee80211_fragment_entry * | |
813 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
814 | u16 fc, unsigned int frag, unsigned int seq, | |
815 | int rx_queue, struct ieee80211_hdr *hdr) | |
816 | { | |
817 | struct ieee80211_fragment_entry *entry; | |
818 | int i, idx; | |
819 | ||
820 | idx = sdata->fragment_next; | |
821 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
822 | struct ieee80211_hdr *f_hdr; | |
823 | u16 f_fc; | |
824 | ||
825 | idx--; | |
826 | if (idx < 0) | |
827 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
828 | ||
829 | entry = &sdata->fragments[idx]; | |
830 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
831 | entry->rx_queue != rx_queue || | |
832 | entry->last_frag + 1 != frag) | |
833 | continue; | |
834 | ||
835 | f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data; | |
836 | f_fc = le16_to_cpu(f_hdr->frame_control); | |
837 | ||
838 | if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) || | |
839 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || | |
840 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
841 | continue; | |
842 | ||
ab46623e | 843 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
844 | __skb_queue_purge(&entry->skb_list); |
845 | continue; | |
846 | } | |
847 | return entry; | |
848 | } | |
849 | ||
850 | return NULL; | |
851 | } | |
852 | ||
49461622 | 853 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 854 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
855 | { |
856 | struct ieee80211_hdr *hdr; | |
857 | u16 sc; | |
858 | unsigned int frag, seq; | |
859 | struct ieee80211_fragment_entry *entry; | |
860 | struct sk_buff *skb; | |
0795af57 | 861 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
862 | |
863 | hdr = (struct ieee80211_hdr *) rx->skb->data; | |
864 | sc = le16_to_cpu(hdr->seq_ctrl); | |
865 | frag = sc & IEEE80211_SCTL_FRAG; | |
866 | ||
867 | if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) || | |
868 | (rx->skb)->len < 24 || | |
869 | is_multicast_ether_addr(hdr->addr1))) { | |
870 | /* not fragmented */ | |
871 | goto out; | |
872 | } | |
873 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
874 | ||
875 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
876 | ||
877 | if (frag == 0) { | |
878 | /* This is the first fragment of a new frame. */ | |
879 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 880 | rx->queue, &(rx->skb)); |
8f20fc24 | 881 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
571ecf67 JB |
882 | (rx->fc & IEEE80211_FCTL_PROTECTED)) { |
883 | /* Store CCMP PN so that we can verify that the next | |
884 | * fragment has a sequential PN value. */ | |
885 | entry->ccmp = 1; | |
886 | memcpy(entry->last_pn, | |
5cf121c3 | 887 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
888 | CCMP_PN_LEN); |
889 | } | |
9ae54c84 | 890 | return RX_QUEUED; |
571ecf67 JB |
891 | } |
892 | ||
893 | /* This is a fragment for a frame that should already be pending in | |
894 | * fragment cache. Add this fragment to the end of the pending entry. | |
895 | */ | |
896 | entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq, | |
5cf121c3 | 897 | rx->queue, hdr); |
571ecf67 JB |
898 | if (!entry) { |
899 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 900 | return RX_DROP_MONITOR; |
571ecf67 JB |
901 | } |
902 | ||
903 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
904 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
905 | if (entry->ccmp) { | |
906 | int i; | |
907 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 908 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 909 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
910 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
911 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
912 | pn[i]++; | |
913 | if (pn[i]) | |
914 | break; | |
915 | } | |
5cf121c3 | 916 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 917 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 918 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
919 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
920 | } | |
921 | ||
922 | skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc)); | |
923 | __skb_queue_tail(&entry->skb_list, rx->skb); | |
924 | entry->last_frag = frag; | |
925 | entry->extra_len += rx->skb->len; | |
926 | if (rx->fc & IEEE80211_FCTL_MOREFRAGS) { | |
927 | rx->skb = NULL; | |
9ae54c84 | 928 | return RX_QUEUED; |
571ecf67 JB |
929 | } |
930 | ||
931 | rx->skb = __skb_dequeue(&entry->skb_list); | |
932 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
933 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
934 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
935 | GFP_ATOMIC))) { | |
936 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
937 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 938 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
939 | } |
940 | } | |
941 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
942 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
943 | dev_kfree_skb(skb); | |
944 | } | |
945 | ||
946 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 947 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
948 | |
949 | out: | |
950 | if (rx->sta) | |
951 | rx->sta->rx_packets++; | |
952 | if (is_multicast_ether_addr(hdr->addr1)) | |
953 | rx->local->dot11MulticastReceivedFrameCount++; | |
954 | else | |
955 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 956 | return RX_CONTINUE; |
571ecf67 JB |
957 | } |
958 | ||
49461622 | 959 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 960 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 961 | { |
98f0b0a3 | 962 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
963 | struct sk_buff *skb; |
964 | int no_pending_pkts; | |
0795af57 | 965 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
966 | |
967 | if (likely(!rx->sta || | |
968 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL || | |
969 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL || | |
5cf121c3 | 970 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 971 | return RX_CONTINUE; |
571ecf67 | 972 | |
51fb61e7 JB |
973 | if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) && |
974 | (sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) | |
e4c26add | 975 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 976 | |
571ecf67 JB |
977 | skb = skb_dequeue(&rx->sta->tx_filtered); |
978 | if (!skb) { | |
979 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
980 | if (skb) | |
981 | rx->local->total_ps_buffered--; | |
982 | } | |
983 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
984 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
985 | ||
986 | if (skb) { | |
987 | struct ieee80211_hdr *hdr = | |
988 | (struct ieee80211_hdr *) skb->data; | |
989 | ||
4a9a66e9 JB |
990 | /* |
991 | * Tell TX path to send one frame even though the STA may | |
992 | * still remain is PS mode after this frame exchange. | |
993 | */ | |
07346f81 | 994 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); |
571ecf67 JB |
995 | |
996 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
997 | printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n", |
998 | print_mac(mac, rx->sta->addr), rx->sta->aid, | |
571ecf67 JB |
999 | skb_queue_len(&rx->sta->ps_tx_buf)); |
1000 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
1001 | ||
1002 | /* Use MoreData flag to indicate whether there are more | |
1003 | * buffered frames for this STA */ | |
836341a7 | 1004 | if (no_pending_pkts) |
571ecf67 | 1005 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
836341a7 | 1006 | else |
571ecf67 JB |
1007 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
1008 | ||
1009 | dev_queue_xmit(skb); | |
1010 | ||
004c872e JB |
1011 | if (no_pending_pkts) |
1012 | sta_info_clear_tim_bit(rx->sta); | |
571ecf67 | 1013 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
5cf121c3 | 1014 | } else if (!rx->sent_ps_buffered) { |
004c872e JB |
1015 | /* |
1016 | * FIXME: This can be the result of a race condition between | |
1017 | * us expiring a frame and the station polling for it. | |
1018 | * Should we send it a null-func frame indicating we | |
1019 | * have nothing buffered for it? | |
1020 | */ | |
0795af57 | 1021 | printk(KERN_DEBUG "%s: STA %s sent PS Poll even " |
f4ea83dd | 1022 | "though there are no buffered frames for it\n", |
0795af57 | 1023 | rx->dev->name, print_mac(mac, rx->sta->addr)); |
571ecf67 | 1024 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
1025 | } |
1026 | ||
9ae54c84 | 1027 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1028 | * count as an dropped frame. */ |
1029 | dev_kfree_skb(rx->skb); | |
1030 | ||
9ae54c84 | 1031 | return RX_QUEUED; |
571ecf67 JB |
1032 | } |
1033 | ||
49461622 | 1034 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1035 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1036 | { |
6e0d114d | 1037 | u8 *data = rx->skb->data; |
238f74a2 | 1038 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1039 | |
238f74a2 | 1040 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1041 | return RX_CONTINUE; |
6e0d114d JB |
1042 | |
1043 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1044 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1045 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1046 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1047 | /* change frame type to non QOS */ |
238f74a2 HH |
1048 | rx->fc &= ~IEEE80211_STYPE_QOS_DATA; |
1049 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); | |
6e0d114d | 1050 | |
9ae54c84 | 1051 | return RX_CONTINUE; |
6e0d114d JB |
1052 | } |
1053 | ||
76ee65bf | 1054 | static int |
5cf121c3 | 1055 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1056 | { |
07346f81 | 1057 | if (unlikely(!rx->sta || |
f4ea83dd | 1058 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1059 | return -EACCES; |
571ecf67 | 1060 | |
76ee65bf | 1061 | return 0; |
571ecf67 JB |
1062 | } |
1063 | ||
76ee65bf | 1064 | static int |
5cf121c3 | 1065 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx) |
571ecf67 | 1066 | { |
3017b80b | 1067 | /* |
7848ba7d JB |
1068 | * Pass through unencrypted frames if the hardware has |
1069 | * decrypted them already. | |
3017b80b | 1070 | */ |
5cf121c3 | 1071 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1072 | return 0; |
571ecf67 JB |
1073 | |
1074 | /* Drop unencrypted frames if key is set. */ | |
1075 | if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) && | |
1076 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
1077 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC && | |
b3fc9c6c | 1078 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1079 | return -EACCES; |
b3fc9c6c | 1080 | |
76ee65bf | 1081 | return 0; |
571ecf67 JB |
1082 | } |
1083 | ||
76ee65bf | 1084 | static int |
5cf121c3 | 1085 | ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1086 | { |
1087 | struct net_device *dev = rx->dev; | |
571ecf67 JB |
1088 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; |
1089 | u16 fc, hdrlen, ethertype; | |
1090 | u8 *payload; | |
1091 | u8 dst[ETH_ALEN]; | |
c97c23e3 | 1092 | u8 src[ETH_ALEN] __aligned(2); |
76ee65bf | 1093 | struct sk_buff *skb = rx->skb; |
571ecf67 | 1094 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
0795af57 JP |
1095 | DECLARE_MAC_BUF(mac); |
1096 | DECLARE_MAC_BUF(mac2); | |
1097 | DECLARE_MAC_BUF(mac3); | |
1098 | DECLARE_MAC_BUF(mac4); | |
571ecf67 JB |
1099 | |
1100 | fc = rx->fc; | |
571ecf67 JB |
1101 | |
1102 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
76ee65bf | 1103 | return -1; |
571ecf67 JB |
1104 | |
1105 | hdrlen = ieee80211_get_hdrlen(fc); | |
1106 | ||
902acc78 | 1107 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
33b64eb2 LCC |
1108 | int meshhdrlen = ieee80211_get_mesh_hdrlen( |
1109 | (struct ieee80211s_hdr *) (skb->data + hdrlen)); | |
1110 | /* Copy on cb: | |
1111 | * - mesh header: to be used for mesh forwarding | |
1112 | * decision. It will also be used as mesh header template at | |
1113 | * tx.c:ieee80211_subif_start_xmit() if interface | |
1114 | * type is mesh and skb->pkt_type == PACKET_OTHERHOST | |
1115 | * - ta: to be used if a RERR needs to be sent. | |
1116 | */ | |
1117 | memcpy(skb->cb, skb->data + hdrlen, meshhdrlen); | |
1118 | memcpy(MESH_PREQ(skb), hdr->addr2, ETH_ALEN); | |
1119 | hdrlen += meshhdrlen; | |
1120 | } | |
33b64eb2 | 1121 | |
571ecf67 JB |
1122 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet |
1123 | * header | |
1124 | * IEEE 802.11 address fields: | |
1125 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
1126 | * 0 0 DA SA BSSID n/a | |
1127 | * 0 1 DA BSSID SA n/a | |
1128 | * 1 0 BSSID SA DA n/a | |
1129 | * 1 1 RA TA DA SA | |
1130 | */ | |
1131 | ||
1132 | switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
1133 | case IEEE80211_FCTL_TODS: | |
1134 | /* BSSID SA DA */ | |
1135 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1136 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1137 | ||
51fb61e7 | 1138 | if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP && |
f4ea83dd | 1139 | sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) |
76ee65bf | 1140 | return -1; |
571ecf67 JB |
1141 | break; |
1142 | case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
1143 | /* RA TA DA SA */ | |
1144 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1145 | memcpy(src, hdr->addr4, ETH_ALEN); | |
1146 | ||
33b64eb2 | 1147 | if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS && |
f4ea83dd | 1148 | sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT)) |
76ee65bf | 1149 | return -1; |
571ecf67 JB |
1150 | break; |
1151 | case IEEE80211_FCTL_FROMDS: | |
1152 | /* DA BSSID SA */ | |
1153 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1154 | memcpy(src, hdr->addr3, ETH_ALEN); | |
1155 | ||
51fb61e7 | 1156 | if (sdata->vif.type != IEEE80211_IF_TYPE_STA || |
b3316157 JL |
1157 | (is_multicast_ether_addr(dst) && |
1158 | !compare_ether_addr(src, dev->dev_addr))) | |
76ee65bf | 1159 | return -1; |
571ecf67 JB |
1160 | break; |
1161 | case 0: | |
1162 | /* DA SA BSSID */ | |
1163 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1164 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1165 | ||
f4ea83dd | 1166 | if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS) |
76ee65bf | 1167 | return -1; |
571ecf67 JB |
1168 | break; |
1169 | } | |
1170 | ||
f4ea83dd | 1171 | if (unlikely(skb->len - hdrlen < 8)) |
76ee65bf | 1172 | return -1; |
571ecf67 | 1173 | |
76ee65bf | 1174 | payload = skb->data + hdrlen; |
571ecf67 JB |
1175 | ethertype = (payload[6] << 8) | payload[7]; |
1176 | ||
1177 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1178 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1179 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1180 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1181 | * replace EtherType */ | |
1182 | skb_pull(skb, hdrlen + 6); | |
1183 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1184 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1185 | } else { | |
1186 | struct ethhdr *ehdr; | |
1187 | __be16 len; | |
ce3edf6d | 1188 | |
571ecf67 JB |
1189 | skb_pull(skb, hdrlen); |
1190 | len = htons(skb->len); | |
1191 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1192 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1193 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1194 | ehdr->h_proto = len; | |
1195 | } | |
76ee65bf RR |
1196 | return 0; |
1197 | } | |
571ecf67 | 1198 | |
ce3edf6d JB |
1199 | /* |
1200 | * requires that rx->skb is a frame with ethernet header | |
1201 | */ | |
5cf121c3 | 1202 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx) |
ce3edf6d | 1203 | { |
c97c23e3 | 1204 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1205 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1206 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1207 | ||
1208 | /* | |
1209 | * Allow EAPOL frames to us/the PAE group address regardless | |
1210 | * of whether the frame was encrypted or not. | |
1211 | */ | |
1212 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1213 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1214 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1215 | return true; | |
1216 | ||
1217 | if (ieee80211_802_1x_port_control(rx) || | |
1218 | ieee80211_drop_unencrypted(rx)) | |
1219 | return false; | |
1220 | ||
1221 | return true; | |
1222 | } | |
1223 | ||
1224 | /* | |
1225 | * requires that rx->skb is a frame with ethernet header | |
1226 | */ | |
76ee65bf | 1227 | static void |
5cf121c3 | 1228 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1229 | { |
1230 | struct net_device *dev = rx->dev; | |
1231 | struct ieee80211_local *local = rx->local; | |
1232 | struct sk_buff *skb, *xmit_skb; | |
1233 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1234 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1235 | struct sta_info *dsta; | |
571ecf67 | 1236 | |
76ee65bf RR |
1237 | skb = rx->skb; |
1238 | xmit_skb = NULL; | |
571ecf67 | 1239 | |
51fb61e7 JB |
1240 | if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP || |
1241 | sdata->vif.type == IEEE80211_IF_TYPE_VLAN) && | |
5cf121c3 | 1242 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
ce3edf6d JB |
1243 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1244 | /* | |
1245 | * send multicast frames both to higher layers in | |
1246 | * local net stack and back to the wireless medium | |
1247 | */ | |
76ee65bf RR |
1248 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1249 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1250 | printk(KERN_DEBUG "%s: failed to clone " |
1251 | "multicast frame\n", dev->name); | |
1252 | } else { | |
571ecf67 | 1253 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1254 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1255 | /* |
1256 | * The destination station is associated to | |
1257 | * this AP (in this VLAN), so send the frame | |
1258 | * directly to it and do not pass it to local | |
1259 | * net stack. | |
571ecf67 | 1260 | */ |
76ee65bf | 1261 | xmit_skb = skb; |
571ecf67 JB |
1262 | skb = NULL; |
1263 | } | |
571ecf67 JB |
1264 | } |
1265 | } | |
1266 | ||
33b64eb2 | 1267 | /* Mesh forwarding */ |
902acc78 | 1268 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
33b64eb2 LCC |
1269 | u8 *mesh_ttl = &((struct ieee80211s_hdr *)skb->cb)->ttl; |
1270 | (*mesh_ttl)--; | |
1271 | ||
1272 | if (is_multicast_ether_addr(skb->data)) { | |
1273 | if (*mesh_ttl > 0) { | |
1274 | xmit_skb = skb_copy(skb, GFP_ATOMIC); | |
69687a0b LCC |
1275 | if (xmit_skb) |
1276 | xmit_skb->pkt_type = PACKET_OTHERHOST; | |
1277 | else if (net_ratelimit()) | |
33b64eb2 LCC |
1278 | printk(KERN_DEBUG "%s: failed to clone " |
1279 | "multicast frame\n", dev->name); | |
33b64eb2 | 1280 | } else |
902acc78 JB |
1281 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta, |
1282 | dropped_frames_ttl); | |
33b64eb2 LCC |
1283 | } else if (skb->pkt_type != PACKET_OTHERHOST && |
1284 | compare_ether_addr(dev->dev_addr, skb->data) != 0) { | |
1285 | if (*mesh_ttl == 0) { | |
902acc78 JB |
1286 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta, |
1287 | dropped_frames_ttl); | |
33b64eb2 LCC |
1288 | dev_kfree_skb(skb); |
1289 | skb = NULL; | |
1290 | } else { | |
1291 | xmit_skb = skb; | |
1292 | xmit_skb->pkt_type = PACKET_OTHERHOST; | |
1293 | if (!(dev->flags & IFF_PROMISC)) | |
1294 | skb = NULL; | |
1295 | } | |
1296 | } | |
1297 | } | |
33b64eb2 | 1298 | |
571ecf67 JB |
1299 | if (skb) { |
1300 | /* deliver to local stack */ | |
1301 | skb->protocol = eth_type_trans(skb, dev); | |
1302 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1303 | netif_rx(skb); | |
1304 | } | |
1305 | ||
76ee65bf | 1306 | if (xmit_skb) { |
571ecf67 | 1307 | /* send to wireless media */ |
f831e909 | 1308 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1309 | skb_reset_network_header(xmit_skb); |
1310 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1311 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1312 | } |
76ee65bf RR |
1313 | } |
1314 | ||
49461622 | 1315 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1316 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f RR |
1317 | { |
1318 | struct net_device *dev = rx->dev; | |
1319 | struct ieee80211_local *local = rx->local; | |
1320 | u16 fc, ethertype; | |
1321 | u8 *payload; | |
1322 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
1323 | const struct ethhdr *eth; | |
1324 | int remaining, err; | |
1325 | u8 dst[ETH_ALEN]; | |
1326 | u8 src[ETH_ALEN]; | |
1327 | DECLARE_MAC_BUF(mac); | |
1328 | ||
1329 | fc = rx->fc; | |
1330 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
9ae54c84 | 1331 | return RX_CONTINUE; |
fd4c7f2f RR |
1332 | |
1333 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
e4c26add | 1334 | return RX_DROP_MONITOR; |
fd4c7f2f | 1335 | |
5cf121c3 | 1336 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1337 | return RX_CONTINUE; |
fd4c7f2f RR |
1338 | |
1339 | err = ieee80211_data_to_8023(rx); | |
1340 | if (unlikely(err)) | |
e4c26add | 1341 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1342 | |
1343 | skb->dev = dev; | |
1344 | ||
1345 | dev->stats.rx_packets++; | |
1346 | dev->stats.rx_bytes += skb->len; | |
1347 | ||
1348 | /* skip the wrapping header */ | |
1349 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1350 | if (!eth) | |
e4c26add | 1351 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1352 | |
1353 | while (skb != frame) { | |
1354 | u8 padding; | |
1355 | __be16 len = eth->h_proto; | |
1356 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1357 | ||
1358 | remaining = skb->len; | |
1359 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1360 | memcpy(src, eth->h_source, ETH_ALEN); | |
1361 | ||
1362 | padding = ((4 - subframe_len) & 0x3); | |
1363 | /* the last MSDU has no padding */ | |
f4ea83dd | 1364 | if (subframe_len > remaining) |
e4c26add | 1365 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1366 | |
1367 | skb_pull(skb, sizeof(struct ethhdr)); | |
1368 | /* if last subframe reuse skb */ | |
1369 | if (remaining <= subframe_len + padding) | |
1370 | frame = skb; | |
1371 | else { | |
1372 | frame = dev_alloc_skb(local->hw.extra_tx_headroom + | |
1373 | subframe_len); | |
1374 | ||
1375 | if (frame == NULL) | |
e4c26add | 1376 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1377 | |
1378 | skb_reserve(frame, local->hw.extra_tx_headroom + | |
1379 | sizeof(struct ethhdr)); | |
1380 | memcpy(skb_put(frame, ntohs(len)), skb->data, | |
1381 | ntohs(len)); | |
1382 | ||
1383 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1384 | padding); | |
1385 | if (!eth) { | |
fd4c7f2f | 1386 | dev_kfree_skb(frame); |
e4c26add | 1387 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1388 | } |
1389 | } | |
1390 | ||
ce3edf6d | 1391 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1392 | frame->dev = dev; |
1393 | frame->priority = skb->priority; | |
1394 | rx->skb = frame; | |
1395 | ||
fd4c7f2f RR |
1396 | payload = frame->data; |
1397 | ethertype = (payload[6] << 8) | payload[7]; | |
1398 | ||
1399 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1400 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1401 | compare_ether_addr(payload, | |
1402 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1403 | /* remove RFC1042 or Bridge-Tunnel |
1404 | * encapsulation and replace EtherType */ | |
1405 | skb_pull(frame, 6); | |
1406 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1407 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1408 | } else { | |
ce3edf6d JB |
1409 | memcpy(skb_push(frame, sizeof(__be16)), |
1410 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1411 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1412 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1413 | } | |
1414 | ||
ce3edf6d JB |
1415 | if (!ieee80211_frame_allowed(rx)) { |
1416 | if (skb == frame) /* last frame */ | |
e4c26add | 1417 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1418 | dev_kfree_skb(frame); |
1419 | continue; | |
1420 | } | |
fd4c7f2f RR |
1421 | |
1422 | ieee80211_deliver_skb(rx); | |
1423 | } | |
1424 | ||
9ae54c84 | 1425 | return RX_QUEUED; |
fd4c7f2f RR |
1426 | } |
1427 | ||
49461622 | 1428 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1429 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1430 | { |
1431 | struct net_device *dev = rx->dev; | |
1432 | u16 fc; | |
ce3edf6d | 1433 | int err; |
76ee65bf RR |
1434 | |
1435 | fc = rx->fc; | |
1436 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
9ae54c84 | 1437 | return RX_CONTINUE; |
76ee65bf RR |
1438 | |
1439 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
e4c26add | 1440 | return RX_DROP_MONITOR; |
76ee65bf | 1441 | |
76ee65bf RR |
1442 | err = ieee80211_data_to_8023(rx); |
1443 | if (unlikely(err)) | |
e4c26add | 1444 | return RX_DROP_UNUSABLE; |
76ee65bf | 1445 | |
ce3edf6d | 1446 | if (!ieee80211_frame_allowed(rx)) |
e4c26add | 1447 | return RX_DROP_MONITOR; |
ce3edf6d | 1448 | |
76ee65bf RR |
1449 | rx->skb->dev = dev; |
1450 | ||
1451 | dev->stats.rx_packets++; | |
1452 | dev->stats.rx_bytes += rx->skb->len; | |
1453 | ||
1454 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1455 | |
9ae54c84 | 1456 | return RX_QUEUED; |
571ecf67 JB |
1457 | } |
1458 | ||
49461622 | 1459 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1460 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1461 | { |
1462 | struct ieee80211_local *local = rx->local; | |
1463 | struct ieee80211_hw *hw = &local->hw; | |
1464 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1465 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1466 | struct tid_ampdu_rx *tid_agg_rx; |
1467 | u16 start_seq_num; | |
1468 | u16 tid; | |
1469 | ||
a7767f95 | 1470 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1471 | return RX_CONTINUE; |
71364716 | 1472 | |
a7767f95 | 1473 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1474 | if (!rx->sta) |
9ae54c84 | 1475 | return RX_CONTINUE; |
71364716 | 1476 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1477 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1478 | != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1479 | return RX_CONTINUE; |
cee24a3e | 1480 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1481 | |
1482 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1483 | ||
1484 | /* reset session timer */ | |
1485 | if (tid_agg_rx->timeout) { | |
1486 | unsigned long expires = | |
1487 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
1488 | mod_timer(&tid_agg_rx->session_timer, expires); | |
1489 | } | |
1490 | ||
1491 | /* manage reordering buffer according to requested */ | |
1492 | /* sequence number */ | |
1493 | rcu_read_lock(); | |
1494 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, | |
1495 | start_seq_num, 1); | |
1496 | rcu_read_unlock(); | |
e4c26add | 1497 | return RX_DROP_UNUSABLE; |
71364716 RR |
1498 | } |
1499 | ||
9ae54c84 | 1500 | return RX_CONTINUE; |
71364716 RR |
1501 | } |
1502 | ||
49461622 | 1503 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1504 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1505 | { |
1506 | struct ieee80211_sub_if_data *sdata; | |
1507 | ||
5cf121c3 | 1508 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1509 | return RX_DROP_MONITOR; |
571ecf67 JB |
1510 | |
1511 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
51fb61e7 | 1512 | if ((sdata->vif.type == IEEE80211_IF_TYPE_STA || |
33b64eb2 LCC |
1513 | sdata->vif.type == IEEE80211_IF_TYPE_IBSS || |
1514 | sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) && | |
ddd3d2be | 1515 | !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)) |
5cf121c3 | 1516 | ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->status); |
f9d540ee | 1517 | else |
e4c26add | 1518 | return RX_DROP_MONITOR; |
f9d540ee | 1519 | |
9ae54c84 | 1520 | return RX_QUEUED; |
571ecf67 JB |
1521 | } |
1522 | ||
571ecf67 JB |
1523 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, |
1524 | struct ieee80211_hdr *hdr, | |
5cf121c3 | 1525 | struct ieee80211_rx_data *rx) |
571ecf67 | 1526 | { |
a7767f95 HH |
1527 | int keyidx; |
1528 | unsigned int hdrlen; | |
0795af57 JP |
1529 | DECLARE_MAC_BUF(mac); |
1530 | DECLARE_MAC_BUF(mac2); | |
571ecf67 | 1531 | |
a7767f95 | 1532 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1533 | if (rx->skb->len >= hdrlen + 4) |
1534 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1535 | else | |
1536 | keyidx = -1; | |
1537 | ||
8944b79f | 1538 | if (!rx->sta) { |
aa0daf0e JB |
1539 | /* |
1540 | * Some hardware seem to generate incorrect Michael MIC | |
1541 | * reports; ignore them to avoid triggering countermeasures. | |
1542 | */ | |
571ecf67 JB |
1543 | goto ignore; |
1544 | } | |
1545 | ||
a7767f95 | 1546 | if (!ieee80211_has_protected(hdr->frame_control)) |
571ecf67 | 1547 | goto ignore; |
571ecf67 | 1548 | |
51fb61e7 | 1549 | if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) { |
aa0daf0e JB |
1550 | /* |
1551 | * APs with pairwise keys should never receive Michael MIC | |
1552 | * errors for non-zero keyidx because these are reserved for | |
1553 | * group keys and only the AP is sending real multicast | |
1554 | * frames in the BSS. | |
1555 | */ | |
eb063c17 | 1556 | goto ignore; |
571ecf67 JB |
1557 | } |
1558 | ||
a7767f95 HH |
1559 | if (!ieee80211_is_data(hdr->frame_control) && |
1560 | !ieee80211_is_auth(hdr->frame_control)) | |
571ecf67 | 1561 | goto ignore; |
571ecf67 | 1562 | |
eb063c17 | 1563 | mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr); |
571ecf67 JB |
1564 | ignore: |
1565 | dev_kfree_skb(rx->skb); | |
1566 | rx->skb = NULL; | |
1567 | } | |
1568 | ||
5cf121c3 JB |
1569 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
1570 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) | |
3d30d949 MW |
1571 | { |
1572 | struct ieee80211_sub_if_data *sdata; | |
1573 | struct ieee80211_local *local = rx->local; | |
1574 | struct ieee80211_rtap_hdr { | |
1575 | struct ieee80211_radiotap_header hdr; | |
1576 | u8 flags; | |
1577 | u8 rate; | |
1578 | __le16 chan_freq; | |
1579 | __le16 chan_flags; | |
1580 | } __attribute__ ((packed)) *rthdr; | |
1581 | struct sk_buff *skb = rx->skb, *skb2; | |
1582 | struct net_device *prev_dev = NULL; | |
5cf121c3 | 1583 | struct ieee80211_rx_status *status = rx->status; |
3d30d949 | 1584 | |
5cf121c3 | 1585 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1586 | goto out_free_skb; |
1587 | ||
1588 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1589 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1590 | goto out_free_skb; | |
1591 | ||
1592 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1593 | memset(rthdr, 0, sizeof(*rthdr)); | |
1594 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1595 | rthdr->hdr.it_present = | |
1596 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1597 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1598 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1599 | ||
5cf121c3 | 1600 | rthdr->rate = rx->rate->bitrate / 5; |
3d30d949 MW |
1601 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1602 | ||
1603 | if (status->band == IEEE80211_BAND_5GHZ) | |
1604 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1605 | IEEE80211_CHAN_5GHZ); | |
1606 | else | |
1607 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1608 | IEEE80211_CHAN_2GHZ); | |
1609 | ||
1610 | skb_set_mac_header(skb, 0); | |
1611 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1612 | skb->pkt_type = PACKET_OTHERHOST; | |
1613 | skb->protocol = htons(ETH_P_802_2); | |
1614 | ||
1615 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1616 | if (!netif_running(sdata->dev)) | |
1617 | continue; | |
1618 | ||
1619 | if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR || | |
1620 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) | |
1621 | continue; | |
1622 | ||
1623 | if (prev_dev) { | |
1624 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1625 | if (skb2) { | |
1626 | skb2->dev = prev_dev; | |
1627 | netif_rx(skb2); | |
1628 | } | |
1629 | } | |
1630 | ||
1631 | prev_dev = sdata->dev; | |
1632 | sdata->dev->stats.rx_packets++; | |
1633 | sdata->dev->stats.rx_bytes += skb->len; | |
1634 | } | |
1635 | ||
1636 | if (prev_dev) { | |
1637 | skb->dev = prev_dev; | |
1638 | netif_rx(skb); | |
1639 | skb = NULL; | |
1640 | } else | |
1641 | goto out_free_skb; | |
1642 | ||
5cf121c3 | 1643 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
1644 | return; |
1645 | ||
1646 | out_free_skb: | |
1647 | dev_kfree_skb(skb); | |
1648 | } | |
1649 | ||
571ecf67 | 1650 | |
8944b79f | 1651 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1652 | struct ieee80211_rx_data *rx, |
8944b79f | 1653 | struct sk_buff *skb) |
58905290 | 1654 | { |
58905290 JB |
1655 | ieee80211_rx_result res = RX_DROP_MONITOR; |
1656 | ||
8944b79f JB |
1657 | rx->skb = skb; |
1658 | rx->sdata = sdata; | |
1659 | rx->dev = sdata->dev; | |
1660 | ||
49461622 JB |
1661 | #define CALL_RXH(rxh) \ |
1662 | res = rxh(rx); \ | |
1663 | if (res != RX_CONTINUE) \ | |
1664 | goto rxh_done; | |
1665 | ||
1666 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
1667 | CALL_RXH(ieee80211_rx_h_check) | |
1668 | CALL_RXH(ieee80211_rx_h_decrypt) | |
1669 | CALL_RXH(ieee80211_rx_h_sta_process) | |
1670 | CALL_RXH(ieee80211_rx_h_defragment) | |
1671 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
1672 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
1673 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
1674 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
1675 | CALL_RXH(ieee80211_rx_h_amsdu) | |
1676 | CALL_RXH(ieee80211_rx_h_data) | |
1677 | CALL_RXH(ieee80211_rx_h_ctrl) | |
1678 | CALL_RXH(ieee80211_rx_h_mgmt) | |
1679 | ||
1680 | #undef CALL_RXH | |
1681 | ||
1682 | rxh_done: | |
58905290 JB |
1683 | switch (res) { |
1684 | case RX_DROP_MONITOR: | |
49461622 JB |
1685 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1686 | if (rx->sta) | |
1687 | rx->sta->rx_dropped++; | |
1688 | /* fall through */ | |
1689 | case RX_CONTINUE: | |
3d30d949 MW |
1690 | ieee80211_rx_cooked_monitor(rx); |
1691 | break; | |
58905290 | 1692 | case RX_DROP_UNUSABLE: |
49461622 JB |
1693 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1694 | if (rx->sta) | |
1695 | rx->sta->rx_dropped++; | |
58905290 JB |
1696 | dev_kfree_skb(rx->skb); |
1697 | break; | |
49461622 JB |
1698 | case RX_QUEUED: |
1699 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
1700 | break; | |
58905290 JB |
1701 | } |
1702 | } | |
1703 | ||
571ecf67 JB |
1704 | /* main receive path */ |
1705 | ||
23a24def | 1706 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1707 | u8 *bssid, struct ieee80211_rx_data *rx, |
23a24def JB |
1708 | struct ieee80211_hdr *hdr) |
1709 | { | |
1710 | int multicast = is_multicast_ether_addr(hdr->addr1); | |
1711 | ||
51fb61e7 | 1712 | switch (sdata->vif.type) { |
23a24def JB |
1713 | case IEEE80211_IF_TYPE_STA: |
1714 | if (!bssid) | |
1715 | return 0; | |
1716 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
5cf121c3 | 1717 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1718 | return 0; |
5cf121c3 | 1719 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1720 | } else if (!multicast && |
1721 | compare_ether_addr(sdata->dev->dev_addr, | |
1722 | hdr->addr1) != 0) { | |
4150c572 | 1723 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1724 | return 0; |
5cf121c3 | 1725 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1726 | } |
1727 | break; | |
1728 | case IEEE80211_IF_TYPE_IBSS: | |
1729 | if (!bssid) | |
1730 | return 0; | |
a7767f95 | 1731 | if (ieee80211_is_beacon(hdr->frame_control)) { |
87291c02 VK |
1732 | if (!rx->sta) |
1733 | rx->sta = ieee80211_ibss_add_sta(sdata->dev, | |
1734 | rx->skb, bssid, hdr->addr2, | |
1735 | BIT(rx->status->rate_idx)); | |
9d9bf77d | 1736 | return 1; |
87291c02 | 1737 | } |
9d9bf77d | 1738 | else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { |
5cf121c3 | 1739 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1740 | return 0; |
5cf121c3 | 1741 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1742 | } else if (!multicast && |
1743 | compare_ether_addr(sdata->dev->dev_addr, | |
1744 | hdr->addr1) != 0) { | |
4150c572 | 1745 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1746 | return 0; |
5cf121c3 | 1747 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1748 | } else if (!rx->sta) |
1749 | rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb, | |
87291c02 VK |
1750 | bssid, hdr->addr2, |
1751 | BIT(rx->status->rate_idx)); | |
23a24def | 1752 | break; |
6032f934 JB |
1753 | case IEEE80211_IF_TYPE_MESH_POINT: |
1754 | if (!multicast && | |
1755 | compare_ether_addr(sdata->dev->dev_addr, | |
1756 | hdr->addr1) != 0) { | |
1757 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
1758 | return 0; | |
1759 | ||
5cf121c3 | 1760 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
1761 | } |
1762 | break; | |
fb1c1cd6 | 1763 | case IEEE80211_IF_TYPE_VLAN: |
23a24def JB |
1764 | case IEEE80211_IF_TYPE_AP: |
1765 | if (!bssid) { | |
1766 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1767 | hdr->addr1)) | |
1768 | return 0; | |
1769 | } else if (!ieee80211_bssid_match(bssid, | |
1770 | sdata->dev->dev_addr)) { | |
5cf121c3 | 1771 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1772 | return 0; |
5cf121c3 | 1773 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 1774 | } |
badffb72 | 1775 | if (sdata->dev == sdata->local->mdev && |
5cf121c3 | 1776 | !(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def JB |
1777 | /* do not receive anything via |
1778 | * master device when not scanning */ | |
1779 | return 0; | |
1780 | break; | |
1781 | case IEEE80211_IF_TYPE_WDS: | |
a7767f95 | 1782 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
1783 | return 0; |
1784 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
1785 | return 0; | |
1786 | break; | |
fb1c1cd6 JB |
1787 | case IEEE80211_IF_TYPE_MNTR: |
1788 | /* take everything */ | |
1789 | break; | |
a2897552 | 1790 | case IEEE80211_IF_TYPE_INVALID: |
fb1c1cd6 JB |
1791 | /* should never get here */ |
1792 | WARN_ON(1); | |
1793 | break; | |
23a24def JB |
1794 | } |
1795 | ||
1796 | return 1; | |
1797 | } | |
1798 | ||
571ecf67 | 1799 | /* |
6368e4b1 RR |
1800 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
1801 | * be called with rcu_read_lock protection. | |
571ecf67 | 1802 | */ |
71ebb4aa RR |
1803 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
1804 | struct sk_buff *skb, | |
1805 | struct ieee80211_rx_status *status, | |
8318d78a | 1806 | struct ieee80211_rate *rate) |
571ecf67 JB |
1807 | { |
1808 | struct ieee80211_local *local = hw_to_local(hw); | |
1809 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 1810 | struct ieee80211_hdr *hdr; |
5cf121c3 | 1811 | struct ieee80211_rx_data rx; |
571ecf67 | 1812 | u16 type; |
6368e4b1 | 1813 | int prepares; |
8e6f0032 JB |
1814 | struct ieee80211_sub_if_data *prev = NULL; |
1815 | struct sk_buff *skb_new; | |
1816 | u8 *bssid; | |
571ecf67 JB |
1817 | |
1818 | hdr = (struct ieee80211_hdr *) skb->data; | |
1819 | memset(&rx, 0, sizeof(rx)); | |
1820 | rx.skb = skb; | |
1821 | rx.local = local; | |
1822 | ||
5cf121c3 | 1823 | rx.status = status; |
5cf121c3 | 1824 | rx.rate = rate; |
b2e7771e | 1825 | rx.fc = le16_to_cpu(hdr->frame_control); |
571ecf67 | 1826 | type = rx.fc & IEEE80211_FCTL_FTYPE; |
72abd81b | 1827 | |
b2e7771e | 1828 | if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT) |
571ecf67 | 1829 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 1830 | |
8944b79f JB |
1831 | rx.sta = sta_info_get(local, hdr->addr2); |
1832 | if (rx.sta) { | |
d0709a65 JB |
1833 | rx.sdata = rx.sta->sdata; |
1834 | rx.dev = rx.sta->sdata->dev; | |
b2e7771e | 1835 | } |
571ecf67 | 1836 | |
571ecf67 | 1837 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
8944b79f | 1838 | ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx); |
d0709a65 | 1839 | return; |
571ecf67 JB |
1840 | } |
1841 | ||
ece8eddd | 1842 | if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning)) |
5cf121c3 | 1843 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 1844 | |
38f3714d JB |
1845 | ieee80211_parse_qos(&rx); |
1846 | ieee80211_verify_ip_alignment(&rx); | |
1847 | ||
571ecf67 JB |
1848 | skb = rx.skb; |
1849 | ||
79010420 | 1850 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
1851 | if (!netif_running(sdata->dev)) |
1852 | continue; | |
1853 | ||
51fb61e7 | 1854 | if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) |
b2e7771e JB |
1855 | continue; |
1856 | ||
51fb61e7 | 1857 | bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); |
5cf121c3 | 1858 | rx.flags |= IEEE80211_RX_RA_MATCH; |
6368e4b1 | 1859 | prepares = prepare_for_handlers(sdata, bssid, &rx, hdr); |
23a24def | 1860 | |
6368e4b1 | 1861 | if (!prepares) |
23a24def | 1862 | continue; |
8e6f0032 | 1863 | |
340e11f3 JB |
1864 | /* |
1865 | * frame is destined for this interface, but if it's not | |
1866 | * also for the previous one we handle that after the | |
1867 | * loop to avoid copying the SKB once too much | |
1868 | */ | |
1869 | ||
1870 | if (!prev) { | |
1871 | prev = sdata; | |
1872 | continue; | |
8e6f0032 | 1873 | } |
340e11f3 JB |
1874 | |
1875 | /* | |
1876 | * frame was destined for the previous interface | |
1877 | * so invoke RX handlers for it | |
1878 | */ | |
1879 | ||
1880 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
1881 | if (!skb_new) { | |
1882 | if (net_ratelimit()) | |
1883 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 1884 | "multicast frame for %s\n", |
dd1cd4c6 JB |
1885 | wiphy_name(local->hw.wiphy), |
1886 | prev->dev->name); | |
340e11f3 JB |
1887 | continue; |
1888 | } | |
69f817b6 | 1889 | rx.fc = le16_to_cpu(hdr->frame_control); |
8944b79f | 1890 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 1891 | prev = sdata; |
571ecf67 | 1892 | } |
8e6f0032 | 1893 | if (prev) { |
69f817b6 | 1894 | rx.fc = le16_to_cpu(hdr->frame_control); |
8944b79f | 1895 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
8e6f0032 JB |
1896 | } else |
1897 | dev_kfree_skb(skb); | |
571ecf67 | 1898 | } |
6368e4b1 | 1899 | |
b580781e RR |
1900 | #define SEQ_MODULO 0x1000 |
1901 | #define SEQ_MASK 0xfff | |
1902 | ||
1903 | static inline int seq_less(u16 sq1, u16 sq2) | |
1904 | { | |
1905 | return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1)); | |
1906 | } | |
1907 | ||
1908 | static inline u16 seq_inc(u16 sq) | |
1909 | { | |
1910 | return ((sq + 1) & SEQ_MASK); | |
1911 | } | |
1912 | ||
1913 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
1914 | { | |
1915 | return ((sq1 - sq2) & SEQ_MASK); | |
1916 | } | |
1917 | ||
1918 | ||
71364716 RR |
1919 | /* |
1920 | * As it function blongs to Rx path it must be called with | |
1921 | * the proper rcu_read_lock protection for its flow. | |
1922 | */ | |
b580781e RR |
1923 | u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
1924 | struct tid_ampdu_rx *tid_agg_rx, | |
1925 | struct sk_buff *skb, u16 mpdu_seq_num, | |
1926 | int bar_req) | |
1927 | { | |
1928 | struct ieee80211_local *local = hw_to_local(hw); | |
1929 | struct ieee80211_rx_status status; | |
1930 | u16 head_seq_num, buf_size; | |
1931 | int index; | |
8318d78a JB |
1932 | struct ieee80211_supported_band *sband; |
1933 | struct ieee80211_rate *rate; | |
b580781e RR |
1934 | |
1935 | buf_size = tid_agg_rx->buf_size; | |
1936 | head_seq_num = tid_agg_rx->head_seq_num; | |
1937 | ||
1938 | /* frame with out of date sequence number */ | |
1939 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
1940 | dev_kfree_skb(skb); | |
1941 | return 1; | |
1942 | } | |
1943 | ||
1944 | /* if frame sequence number exceeds our buffering window size or | |
1945 | * block Ack Request arrived - release stored frames */ | |
1946 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
1947 | /* new head to the ordering buffer */ | |
1948 | if (bar_req) | |
1949 | head_seq_num = mpdu_seq_num; | |
1950 | else | |
1951 | head_seq_num = | |
1952 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
1953 | /* release stored frames up to new head to stack */ | |
1954 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
1955 | index = seq_sub(tid_agg_rx->head_seq_num, | |
1956 | tid_agg_rx->ssn) | |
1957 | % tid_agg_rx->buf_size; | |
1958 | ||
1959 | if (tid_agg_rx->reorder_buf[index]) { | |
1960 | /* release the reordered frames to stack */ | |
1961 | memcpy(&status, | |
1962 | tid_agg_rx->reorder_buf[index]->cb, | |
1963 | sizeof(status)); | |
8318d78a JB |
1964 | sband = local->hw.wiphy->bands[status.band]; |
1965 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e RR |
1966 | __ieee80211_rx_handle_packet(hw, |
1967 | tid_agg_rx->reorder_buf[index], | |
9e72ebd6 | 1968 | &status, rate); |
b580781e RR |
1969 | tid_agg_rx->stored_mpdu_num--; |
1970 | tid_agg_rx->reorder_buf[index] = NULL; | |
1971 | } | |
1972 | tid_agg_rx->head_seq_num = | |
1973 | seq_inc(tid_agg_rx->head_seq_num); | |
1974 | } | |
1975 | if (bar_req) | |
1976 | return 1; | |
1977 | } | |
1978 | ||
1979 | /* now the new frame is always in the range of the reordering */ | |
1980 | /* buffer window */ | |
1981 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
1982 | % tid_agg_rx->buf_size; | |
1983 | /* check if we already stored this frame */ | |
1984 | if (tid_agg_rx->reorder_buf[index]) { | |
1985 | dev_kfree_skb(skb); | |
1986 | return 1; | |
1987 | } | |
1988 | ||
1989 | /* if arrived mpdu is in the right order and nothing else stored */ | |
1990 | /* release it immediately */ | |
1991 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
1992 | tid_agg_rx->stored_mpdu_num == 0) { | |
1993 | tid_agg_rx->head_seq_num = | |
1994 | seq_inc(tid_agg_rx->head_seq_num); | |
1995 | return 0; | |
1996 | } | |
1997 | ||
1998 | /* put the frame in the reordering buffer */ | |
1999 | tid_agg_rx->reorder_buf[index] = skb; | |
2000 | tid_agg_rx->stored_mpdu_num++; | |
2001 | /* release the buffer until next missing frame */ | |
2002 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
2003 | % tid_agg_rx->buf_size; | |
2004 | while (tid_agg_rx->reorder_buf[index]) { | |
2005 | /* release the reordered frame back to stack */ | |
2006 | memcpy(&status, tid_agg_rx->reorder_buf[index]->cb, | |
2007 | sizeof(status)); | |
8318d78a JB |
2008 | sband = local->hw.wiphy->bands[status.band]; |
2009 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e | 2010 | __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index], |
9e72ebd6 | 2011 | &status, rate); |
b580781e RR |
2012 | tid_agg_rx->stored_mpdu_num--; |
2013 | tid_agg_rx->reorder_buf[index] = NULL; | |
2014 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2015 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2016 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2017 | } | |
2018 | return 1; | |
2019 | } | |
2020 | ||
71ebb4aa RR |
2021 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
2022 | struct sk_buff *skb) | |
b580781e RR |
2023 | { |
2024 | struct ieee80211_hw *hw = &local->hw; | |
2025 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2026 | struct sta_info *sta; | |
2027 | struct tid_ampdu_rx *tid_agg_rx; | |
87228f57 | 2028 | u16 sc; |
b580781e | 2029 | u16 mpdu_seq_num; |
182503ab | 2030 | u8 ret = 0; |
b580781e RR |
2031 | int tid; |
2032 | ||
2033 | sta = sta_info_get(local, hdr->addr2); | |
2034 | if (!sta) | |
2035 | return ret; | |
2036 | ||
b580781e RR |
2037 | /* filter the QoS data rx stream according to |
2038 | * STA/TID and check if this STA/TID is on aggregation */ | |
87228f57 | 2039 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
b580781e RR |
2040 | goto end_reorder; |
2041 | ||
238f74a2 | 2042 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
b580781e | 2043 | |
cee24a3e | 2044 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
b580781e RR |
2045 | goto end_reorder; |
2046 | ||
cee24a3e RR |
2047 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2048 | ||
b580781e | 2049 | /* null data frames are excluded */ |
87228f57 | 2050 | if (unlikely(ieee80211_is_nullfunc(hdr->frame_control))) |
b580781e RR |
2051 | goto end_reorder; |
2052 | ||
2053 | /* new un-ordered ampdu frame - process it */ | |
2054 | ||
2055 | /* reset session timer */ | |
2056 | if (tid_agg_rx->timeout) { | |
2057 | unsigned long expires = | |
2058 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
2059 | mod_timer(&tid_agg_rx->session_timer, expires); | |
2060 | } | |
2061 | ||
2062 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2063 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2064 | if (sc & IEEE80211_SCTL_FRAG) { | |
d0709a65 | 2065 | ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr, |
b580781e RR |
2066 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
2067 | ret = 1; | |
2068 | goto end_reorder; | |
2069 | } | |
2070 | ||
2071 | /* according to mpdu sequence number deal with reordering buffer */ | |
2072 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
2073 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, | |
2074 | mpdu_seq_num, 0); | |
d0709a65 | 2075 | end_reorder: |
b580781e RR |
2076 | return ret; |
2077 | } | |
2078 | ||
6368e4b1 RR |
2079 | /* |
2080 | * This is the receive path handler. It is called by a low level driver when an | |
2081 | * 802.11 MPDU is received from the hardware. | |
2082 | */ | |
2083 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2084 | struct ieee80211_rx_status *status) | |
2085 | { | |
2086 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2087 | struct ieee80211_rate *rate = NULL; |
2088 | struct ieee80211_supported_band *sband; | |
2089 | ||
2090 | if (status->band < 0 || | |
13d8fd2d | 2091 | status->band >= IEEE80211_NUM_BANDS) { |
8318d78a JB |
2092 | WARN_ON(1); |
2093 | return; | |
2094 | } | |
2095 | ||
2096 | sband = local->hw.wiphy->bands[status->band]; | |
2097 | ||
2098 | if (!sband || | |
2099 | status->rate_idx < 0 || | |
2100 | status->rate_idx >= sband->n_bitrates) { | |
2101 | WARN_ON(1); | |
2102 | return; | |
2103 | } | |
2104 | ||
2105 | rate = &sband->bitrates[status->rate_idx]; | |
6368e4b1 RR |
2106 | |
2107 | /* | |
2108 | * key references and virtual interfaces are protected using RCU | |
2109 | * and this requires that we are in a read-side RCU section during | |
2110 | * receive processing | |
2111 | */ | |
2112 | rcu_read_lock(); | |
2113 | ||
2114 | /* | |
2115 | * Frames with failed FCS/PLCP checksum are not returned, | |
2116 | * all other frames are returned without radiotap header | |
2117 | * if it was previously present. | |
2118 | * Also, frames with less than 16 bytes are dropped. | |
2119 | */ | |
8318d78a | 2120 | skb = ieee80211_rx_monitor(local, skb, status, rate); |
6368e4b1 RR |
2121 | if (!skb) { |
2122 | rcu_read_unlock(); | |
2123 | return; | |
2124 | } | |
2125 | ||
b580781e | 2126 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
9e72ebd6 | 2127 | __ieee80211_rx_handle_packet(hw, skb, status, rate); |
6368e4b1 RR |
2128 | |
2129 | rcu_read_unlock(); | |
2130 | } | |
571ecf67 JB |
2131 | EXPORT_SYMBOL(__ieee80211_rx); |
2132 | ||
2133 | /* This is a version of the rx handler that can be called from hard irq | |
2134 | * context. Post the skb on the queue and schedule the tasklet */ | |
2135 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2136 | struct ieee80211_rx_status *status) | |
2137 | { | |
2138 | struct ieee80211_local *local = hw_to_local(hw); | |
2139 | ||
2140 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2141 | ||
2142 | skb->dev = local->mdev; | |
2143 | /* copy status into skb->cb for use by tasklet */ | |
2144 | memcpy(skb->cb, status, sizeof(*status)); | |
2145 | skb->pkt_type = IEEE80211_RX_MSG; | |
2146 | skb_queue_tail(&local->skb_queue, skb); | |
2147 | tasklet_schedule(&local->tasklet); | |
2148 | } | |
2149 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |