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; | |
b4f28bbb BR |
146 | if (status->flag & RX_FLAG_SHORTPRE) |
147 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
148 | pos++; |
149 | ||
150 | /* IEEE80211_RADIOTAP_RATE */ | |
151 | *pos = rate->bitrate / 5; | |
152 | pos++; | |
153 | ||
154 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
155 | *(__le16 *)pos = cpu_to_le16(status->freq); | |
156 | pos += 2; | |
157 | if (status->band == IEEE80211_BAND_5GHZ) | |
158 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
159 | IEEE80211_CHAN_5GHZ); | |
9deb1ae5 BR |
160 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
161 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
162 | IEEE80211_CHAN_2GHZ); | |
601ae7f2 | 163 | else |
9deb1ae5 | 164 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK | |
601ae7f2 BR |
165 | IEEE80211_CHAN_2GHZ); |
166 | pos += 2; | |
167 | ||
168 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
169 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
170 | *pos = status->signal; | |
171 | rthdr->it_present |= | |
172 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
173 | pos++; | |
174 | } | |
175 | ||
176 | /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ | |
177 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { | |
178 | *pos = status->noise; | |
179 | rthdr->it_present |= | |
180 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); | |
181 | pos++; | |
182 | } | |
183 | ||
184 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ | |
185 | ||
186 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
187 | *pos = status->antenna; | |
188 | pos++; | |
189 | ||
190 | /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */ | |
191 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) { | |
192 | *pos = status->signal; | |
193 | rthdr->it_present |= | |
194 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL); | |
195 | pos++; | |
196 | } | |
197 | ||
198 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ | |
199 | ||
200 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
201 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
202 | if ((pos - (unsigned char *)rthdr) & 1) | |
203 | pos++; | |
204 | /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */ | |
205 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
206 | *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS); | |
207 | pos += 2; | |
208 | } | |
209 | ||
b2e7771e JB |
210 | /* |
211 | * This function copies a received frame to all monitor interfaces and | |
212 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
213 | * radiotap header the driver might have added. | |
214 | */ | |
215 | static struct sk_buff * | |
216 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a JB |
217 | struct ieee80211_rx_status *status, |
218 | struct ieee80211_rate *rate) | |
b2e7771e JB |
219 | { |
220 | struct ieee80211_sub_if_data *sdata; | |
b2e7771e | 221 | int needed_headroom = 0; |
b2e7771e JB |
222 | struct sk_buff *skb, *skb2; |
223 | struct net_device *prev_dev = NULL; | |
224 | int present_fcs_len = 0; | |
225 | int rtap_len = 0; | |
226 | ||
227 | /* | |
228 | * First, we may need to make a copy of the skb because | |
229 | * (1) we need to modify it for radiotap (if not present), and | |
230 | * (2) the other RX handlers will modify the skb we got. | |
231 | * | |
232 | * We don't need to, of course, if we aren't going to return | |
233 | * the SKB because it has a bad FCS/PLCP checksum. | |
234 | */ | |
235 | if (status->flag & RX_FLAG_RADIOTAP) | |
236 | rtap_len = ieee80211_get_radiotap_len(origskb->data); | |
237 | else | |
601ae7f2 BR |
238 | /* room for the radiotap header based on driver features */ |
239 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
240 | |
241 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
242 | present_fcs_len = FCS_LEN; | |
243 | ||
244 | if (!local->monitors) { | |
245 | if (should_drop_frame(status, origskb, present_fcs_len, | |
246 | rtap_len)) { | |
247 | dev_kfree_skb(origskb); | |
248 | return NULL; | |
249 | } | |
250 | ||
251 | return remove_monitor_info(local, origskb, rtap_len); | |
252 | } | |
253 | ||
254 | if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) { | |
255 | /* only need to expand headroom if necessary */ | |
256 | skb = origskb; | |
257 | origskb = NULL; | |
258 | ||
259 | /* | |
260 | * This shouldn't trigger often because most devices have an | |
261 | * RX header they pull before we get here, and that should | |
262 | * be big enough for our radiotap information. We should | |
263 | * probably export the length to drivers so that we can have | |
264 | * them allocate enough headroom to start with. | |
265 | */ | |
266 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 267 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
268 | dev_kfree_skb(skb); |
269 | return NULL; | |
270 | } | |
271 | } else { | |
272 | /* | |
273 | * Need to make a copy and possibly remove radiotap header | |
274 | * and FCS from the original. | |
275 | */ | |
276 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
277 | ||
278 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
279 | ||
280 | if (!skb) | |
281 | return origskb; | |
282 | } | |
283 | ||
284 | /* if necessary, prepend radiotap information */ | |
601ae7f2 BR |
285 | if (!(status->flag & RX_FLAG_RADIOTAP)) |
286 | ieee80211_add_rx_radiotap_header(local, skb, status, rate, | |
287 | needed_headroom); | |
b2e7771e | 288 | |
ce3edf6d | 289 | skb_reset_mac_header(skb); |
b2e7771e JB |
290 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
291 | skb->pkt_type = PACKET_OTHERHOST; | |
292 | skb->protocol = htons(ETH_P_802_2); | |
293 | ||
294 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
295 | if (!netif_running(sdata->dev)) | |
296 | continue; | |
297 | ||
51fb61e7 | 298 | if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR) |
b2e7771e JB |
299 | continue; |
300 | ||
3d30d949 MW |
301 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
302 | continue; | |
303 | ||
b2e7771e JB |
304 | if (prev_dev) { |
305 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
306 | if (skb2) { | |
307 | skb2->dev = prev_dev; | |
308 | netif_rx(skb2); | |
309 | } | |
310 | } | |
311 | ||
312 | prev_dev = sdata->dev; | |
313 | sdata->dev->stats.rx_packets++; | |
314 | sdata->dev->stats.rx_bytes += skb->len; | |
315 | } | |
316 | ||
317 | if (prev_dev) { | |
318 | skb->dev = prev_dev; | |
319 | netif_rx(skb); | |
320 | } else | |
321 | dev_kfree_skb(skb); | |
322 | ||
323 | return origskb; | |
324 | } | |
325 | ||
326 | ||
5cf121c3 | 327 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 328 | { |
238f74a2 | 329 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
330 | int tid; |
331 | ||
332 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
333 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
334 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 335 | /* frame has qos control */ |
238f74a2 HH |
336 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
337 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 338 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 339 | else |
5cf121c3 | 340 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 341 | } else { |
1411f9b5 JB |
342 | /* |
343 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
344 | * | |
345 | * Sequence numbers for management frames, QoS data | |
346 | * frames with a broadcast/multicast address in the | |
347 | * Address 1 field, and all non-QoS data frames sent | |
348 | * by QoS STAs are assigned using an additional single | |
349 | * modulo-4096 counter, [...] | |
350 | * | |
351 | * We also use that counter for non-QoS STAs. | |
352 | */ | |
353 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 354 | } |
52865dfd | 355 | |
5cf121c3 | 356 | rx->queue = tid; |
6e0d114d JB |
357 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
358 | * For now, set skb->priority to 0 for other cases. */ | |
359 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 360 | } |
6e0d114d | 361 | |
5cf121c3 | 362 | static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx) |
38f3714d JB |
363 | { |
364 | #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT | |
a7767f95 | 365 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
38f3714d JB |
366 | int hdrlen; |
367 | ||
a7767f95 | 368 | if (!ieee80211_is_data_present(hdr->frame_control)) |
38f3714d JB |
369 | return; |
370 | ||
371 | /* | |
372 | * Drivers are required to align the payload data in a way that | |
373 | * guarantees that the contained IP header is aligned to a four- | |
374 | * byte boundary. In the case of regular frames, this simply means | |
375 | * aligning the payload to a four-byte boundary (because either | |
376 | * the IP header is directly contained, or IV/RFC1042 headers that | |
377 | * have a length divisible by four are in front of it. | |
378 | * | |
379 | * With A-MSDU frames, however, the payload data address must | |
380 | * yield two modulo four because there are 14-byte 802.3 headers | |
381 | * within the A-MSDU frames that push the IP header further back | |
382 | * to a multiple of four again. Thankfully, the specs were sane | |
383 | * enough this time around to require padding each A-MSDU subframe | |
384 | * to a length that is a multiple of four. | |
385 | * | |
386 | * Padding like atheros hardware adds which is inbetween the 802.11 | |
387 | * header and the payload is not supported, the driver is required | |
388 | * to move the 802.11 header further back in that case. | |
389 | */ | |
a7767f95 | 390 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
5cf121c3 | 391 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d JB |
392 | hdrlen += ETH_HLEN; |
393 | WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3); | |
394 | #endif | |
6e0d114d JB |
395 | } |
396 | ||
6368e4b1 | 397 | |
571ecf67 JB |
398 | /* rx handlers */ |
399 | ||
49461622 | 400 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 401 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
402 | { |
403 | struct ieee80211_local *local = rx->local; | |
404 | struct sk_buff *skb = rx->skb; | |
405 | ||
ece8eddd | 406 | if (unlikely(local->sta_hw_scanning)) |
5cf121c3 | 407 | return ieee80211_sta_rx_scan(rx->dev, skb, rx->status); |
ece8eddd ZY |
408 | |
409 | if (unlikely(local->sta_sw_scanning)) { | |
410 | /* drop all the other packets during a software scan anyway */ | |
5cf121c3 | 411 | if (ieee80211_sta_rx_scan(rx->dev, skb, rx->status) |
9ae54c84 | 412 | != RX_QUEUED) |
ece8eddd | 413 | dev_kfree_skb(skb); |
9ae54c84 | 414 | return RX_QUEUED; |
571ecf67 JB |
415 | } |
416 | ||
5cf121c3 | 417 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
418 | /* scanning finished during invoking of handlers */ |
419 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 420 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
421 | } |
422 | ||
9ae54c84 | 423 | return RX_CONTINUE; |
571ecf67 JB |
424 | } |
425 | ||
33b64eb2 | 426 | static ieee80211_rx_result |
5cf121c3 | 427 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 428 | { |
a7767f95 HH |
429 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
430 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
d6d1a5a7 | 431 | |
a7767f95 HH |
432 | if (ieee80211_is_data(hdr->frame_control)) { |
433 | if (!ieee80211_has_a4(hdr->frame_control)) | |
33b64eb2 LCC |
434 | return RX_DROP_MONITOR; |
435 | if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0) | |
436 | return RX_DROP_MONITOR; | |
437 | } | |
438 | ||
439 | /* If there is not an established peer link and this is not a peer link | |
440 | * establisment frame, beacon or probe, drop the frame. | |
441 | */ | |
442 | ||
b4e08ea1 | 443 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 444 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 445 | |
a7767f95 | 446 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
447 | return RX_DROP_MONITOR; |
448 | ||
a7767f95 | 449 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 LCC |
450 | mgmt = (struct ieee80211_mgmt *)hdr; |
451 | if (mgmt->u.action.category != PLINK_CATEGORY) | |
452 | return RX_DROP_MONITOR; | |
33b64eb2 | 453 | return RX_CONTINUE; |
33b64eb2 LCC |
454 | } |
455 | ||
a7767f95 HH |
456 | if (ieee80211_is_probe_req(hdr->frame_control) || |
457 | ieee80211_is_probe_resp(hdr->frame_control) || | |
458 | ieee80211_is_beacon(hdr->frame_control)) | |
459 | return RX_CONTINUE; | |
460 | ||
461 | return RX_DROP_MONITOR; | |
462 | ||
463 | } | |
464 | ||
465 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
466 | ||
467 | if (ieee80211_is_data(hdr->frame_control) && | |
468 | is_multicast_ether_addr(hdr->addr1) && | |
469 | mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->dev)) | |
33b64eb2 | 470 | return RX_DROP_MONITOR; |
902acc78 | 471 | #undef msh_h_get |
d6d1a5a7 | 472 | |
902acc78 JB |
473 | return RX_CONTINUE; |
474 | } | |
33b64eb2 LCC |
475 | |
476 | ||
49461622 | 477 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 478 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 479 | { |
a7767f95 | 480 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
481 | |
482 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
483 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 484 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 485 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 486 | hdr->seq_ctrl)) { |
5cf121c3 | 487 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
488 | rx->local->dot11FrameDuplicateCount++; |
489 | rx->sta->num_duplicates++; | |
490 | } | |
e4c26add | 491 | return RX_DROP_MONITOR; |
571ecf67 | 492 | } else |
5cf121c3 | 493 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
494 | } |
495 | ||
571ecf67 JB |
496 | if (unlikely(rx->skb->len < 16)) { |
497 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 498 | return RX_DROP_MONITOR; |
571ecf67 JB |
499 | } |
500 | ||
571ecf67 JB |
501 | /* Drop disallowed frame classes based on STA auth/assoc state; |
502 | * IEEE 802.11, Chap 5.5. | |
503 | * | |
504 | * 80211.o does filtering only based on association state, i.e., it | |
505 | * drops Class 3 frames from not associated stations. hostapd sends | |
506 | * deauth/disassoc frames when needed. In addition, hostapd is | |
507 | * responsible for filtering on both auth and assoc states. | |
508 | */ | |
33b64eb2 | 509 | |
902acc78 | 510 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 511 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 512 | |
a7767f95 HH |
513 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
514 | ieee80211_is_pspoll(hdr->frame_control)) && | |
51fb61e7 | 515 | rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS && |
07346f81 | 516 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
517 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
518 | !ieee80211_has_tods(hdr->frame_control) && | |
519 | ieee80211_is_data(hdr->frame_control)) || | |
520 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
521 | /* Drop IBSS frames and frames for other hosts |
522 | * silently. */ | |
e4c26add | 523 | return RX_DROP_MONITOR; |
571ecf67 JB |
524 | } |
525 | ||
e4c26add | 526 | return RX_DROP_MONITOR; |
571ecf67 JB |
527 | } |
528 | ||
9ae54c84 | 529 | return RX_CONTINUE; |
570bd537 JB |
530 | } |
531 | ||
532 | ||
49461622 | 533 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 534 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 535 | { |
a7767f95 | 536 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
3017b80b JB |
537 | int keyidx; |
538 | int hdrlen; | |
e4c26add | 539 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 540 | struct ieee80211_key *stakey = NULL; |
570bd537 | 541 | |
3017b80b JB |
542 | /* |
543 | * Key selection 101 | |
544 | * | |
545 | * There are three types of keys: | |
546 | * - GTK (group keys) | |
547 | * - PTK (pairwise keys) | |
548 | * - STK (station-to-station pairwise keys) | |
549 | * | |
550 | * When selecting a key, we have to distinguish between multicast | |
551 | * (including broadcast) and unicast frames, the latter can only | |
552 | * use PTKs and STKs while the former always use GTKs. Unless, of | |
553 | * course, actual WEP keys ("pre-RSNA") are used, then unicast | |
554 | * frames can also use key indizes like GTKs. Hence, if we don't | |
555 | * have a PTK/STK we check the key index for a WEP key. | |
556 | * | |
8dc06a1c JB |
557 | * Note that in a regular BSS, multicast frames are sent by the |
558 | * AP only, associated stations unicast the frame to the AP first | |
559 | * which then multicasts it on their behalf. | |
560 | * | |
3017b80b JB |
561 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
562 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
563 | * The spec seems to expect that one negotiates the same key with |
564 | * every station but there's no such requirement; VLANs could be | |
565 | * possible. | |
3017b80b JB |
566 | */ |
567 | ||
a7767f95 | 568 | if (!ieee80211_has_protected(hdr->frame_control)) |
9ae54c84 | 569 | return RX_CONTINUE; |
571ecf67 | 570 | |
3017b80b | 571 | /* |
1990af8d | 572 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
573 | * addressed to us nor a multicast frame. |
574 | */ | |
5cf121c3 | 575 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 576 | return RX_CONTINUE; |
3017b80b | 577 | |
d4e46a3d JB |
578 | if (rx->sta) |
579 | stakey = rcu_dereference(rx->sta->key); | |
580 | ||
581 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { | |
582 | rx->key = stakey; | |
571ecf67 | 583 | } else { |
3017b80b JB |
584 | /* |
585 | * The device doesn't give us the IV so we won't be | |
586 | * able to look up the key. That's ok though, we | |
587 | * don't need to decrypt the frame, we just won't | |
588 | * be able to keep statistics accurate. | |
589 | * Except for key threshold notifications, should | |
590 | * we somehow allow the driver to tell us which key | |
591 | * the hardware used if this flag is set? | |
592 | */ | |
5cf121c3 JB |
593 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
594 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 595 | return RX_CONTINUE; |
3017b80b | 596 | |
a7767f95 | 597 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
598 | |
599 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 600 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
601 | |
602 | /* | |
603 | * no need to call ieee80211_wep_get_keyidx, | |
604 | * it verifies a bunch of things we've done already | |
605 | */ | |
606 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
607 | ||
d4e46a3d | 608 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
609 | |
610 | /* | |
611 | * RSNA-protected unicast frames should always be sent with | |
612 | * pairwise or station-to-station keys, but for WEP we allow | |
613 | * using a key index as well. | |
614 | */ | |
8f20fc24 | 615 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
616 | !is_multicast_ether_addr(hdr->addr1)) |
617 | rx->key = NULL; | |
571ecf67 JB |
618 | } |
619 | ||
3017b80b | 620 | if (rx->key) { |
571ecf67 | 621 | rx->key->tx_rx_count++; |
011bfcc4 | 622 | /* TODO: add threshold stuff again */ |
1990af8d | 623 | } else { |
e4c26add | 624 | return RX_DROP_MONITOR; |
70f08765 JB |
625 | } |
626 | ||
1990af8d JB |
627 | /* Check for weak IVs if possible */ |
628 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 629 | ieee80211_is_data(hdr->frame_control) && |
5cf121c3 JB |
630 | (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
631 | !(rx->status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
632 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
633 | rx->sta->wep_weak_iv_count++; | |
634 | ||
70f08765 JB |
635 | switch (rx->key->conf.alg) { |
636 | case ALG_WEP: | |
e2f036da MN |
637 | result = ieee80211_crypto_wep_decrypt(rx); |
638 | break; | |
70f08765 | 639 | case ALG_TKIP: |
e2f036da MN |
640 | result = ieee80211_crypto_tkip_decrypt(rx); |
641 | break; | |
70f08765 | 642 | case ALG_CCMP: |
e2f036da MN |
643 | result = ieee80211_crypto_ccmp_decrypt(rx); |
644 | break; | |
70f08765 JB |
645 | } |
646 | ||
e2f036da | 647 | /* either the frame has been decrypted or will be dropped */ |
5cf121c3 | 648 | rx->status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
649 | |
650 | return result; | |
70f08765 JB |
651 | } |
652 | ||
571ecf67 JB |
653 | static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta) |
654 | { | |
655 | struct ieee80211_sub_if_data *sdata; | |
0795af57 JP |
656 | DECLARE_MAC_BUF(mac); |
657 | ||
d0709a65 | 658 | sdata = sta->sdata; |
571ecf67 | 659 | |
3e122be0 | 660 | atomic_inc(&sdata->bss->num_sta_ps); |
07346f81 | 661 | set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL); |
571ecf67 | 662 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0795af57 JP |
663 | printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n", |
664 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 JB |
665 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
666 | } | |
667 | ||
668 | static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta) | |
669 | { | |
670 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
671 | struct sk_buff *skb; | |
672 | int sent = 0; | |
673 | struct ieee80211_sub_if_data *sdata; | |
e039fa4a | 674 | struct ieee80211_tx_info *info; |
0795af57 | 675 | DECLARE_MAC_BUF(mac); |
571ecf67 | 676 | |
d0709a65 | 677 | sdata = sta->sdata; |
004c872e | 678 | |
3e122be0 | 679 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 680 | |
07346f81 | 681 | clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL); |
004c872e JB |
682 | |
683 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
684 | sta_info_clear_tim_bit(sta); | |
685 | ||
571ecf67 | 686 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0795af57 JP |
687 | printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n", |
688 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 | 689 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 690 | |
571ecf67 JB |
691 | /* Send all buffered frames to the station */ |
692 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
e039fa4a | 693 | info = IEEE80211_SKB_CB(skb); |
571ecf67 | 694 | sent++; |
e039fa4a | 695 | info->flags |= IEEE80211_TX_CTL_REQUEUE; |
571ecf67 JB |
696 | dev_queue_xmit(skb); |
697 | } | |
698 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
e039fa4a | 699 | info = IEEE80211_SKB_CB(skb); |
571ecf67 JB |
700 | local->total_ps_buffered--; |
701 | sent++; | |
702 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 | 703 | printk(KERN_DEBUG "%s: STA %s aid %d send PS frame " |
571ecf67 | 704 | "since STA not sleeping anymore\n", dev->name, |
0795af57 | 705 | print_mac(mac, sta->addr), sta->aid); |
571ecf67 | 706 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
e039fa4a | 707 | info->flags |= IEEE80211_TX_CTL_REQUEUE; |
571ecf67 JB |
708 | dev_queue_xmit(skb); |
709 | } | |
710 | ||
711 | return sent; | |
712 | } | |
713 | ||
49461622 | 714 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 715 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
716 | { |
717 | struct sta_info *sta = rx->sta; | |
718 | struct net_device *dev = rx->dev; | |
a7767f95 | 719 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
720 | |
721 | if (!sta) | |
9ae54c84 | 722 | return RX_CONTINUE; |
571ecf67 JB |
723 | |
724 | /* Update last_rx only for IBSS packets which are for the current | |
725 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
726 | * other STAs are using different BSSID. */ | |
51fb61e7 | 727 | if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) { |
71364716 RR |
728 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
729 | IEEE80211_IF_TYPE_IBSS); | |
571ecf67 JB |
730 | if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0) |
731 | sta->last_rx = jiffies; | |
732 | } else | |
733 | if (!is_multicast_ether_addr(hdr->addr1) || | |
51fb61e7 | 734 | rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) { |
571ecf67 JB |
735 | /* Update last_rx only for unicast frames in order to prevent |
736 | * the Probe Request frames (the only broadcast frames from a | |
737 | * STA in infrastructure mode) from keeping a connection alive. | |
33b64eb2 LCC |
738 | * Mesh beacons will update last_rx when if they are found to |
739 | * match the current local configuration when processed. | |
571ecf67 JB |
740 | */ |
741 | sta->last_rx = jiffies; | |
742 | } | |
743 | ||
5cf121c3 | 744 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 745 | return RX_CONTINUE; |
571ecf67 JB |
746 | |
747 | sta->rx_fragments++; | |
748 | sta->rx_bytes += rx->skb->len; | |
5cf121c3 | 749 | sta->last_signal = rx->status->signal; |
566bfe5a | 750 | sta->last_qual = rx->status->qual; |
5cf121c3 | 751 | sta->last_noise = rx->status->noise; |
571ecf67 | 752 | |
3e122be0 JB |
753 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
754 | (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP || | |
755 | rx->sdata->vif.type == IEEE80211_IF_TYPE_VLAN)) { | |
571ecf67 JB |
756 | /* Change STA power saving mode only in the end of a frame |
757 | * exchange sequence */ | |
07346f81 | 758 | if (test_sta_flags(sta, WLAN_STA_PS) && |
a7767f95 | 759 | !ieee80211_has_pm(hdr->frame_control)) |
5cf121c3 | 760 | rx->sent_ps_buffered += ap_sta_ps_end(dev, sta); |
07346f81 | 761 | else if (!test_sta_flags(sta, WLAN_STA_PS) && |
a7767f95 | 762 | ieee80211_has_pm(hdr->frame_control)) |
571ecf67 JB |
763 | ap_sta_ps_start(dev, sta); |
764 | } | |
765 | ||
766 | /* Drop data::nullfunc frames silently, since they are used only to | |
767 | * control station power saving mode. */ | |
a7767f95 | 768 | if (ieee80211_is_nullfunc(hdr->frame_control)) { |
571ecf67 JB |
769 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
770 | /* Update counter and free packet here to avoid counting this | |
771 | * as a dropped packed. */ | |
772 | sta->rx_packets++; | |
773 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 774 | return RX_QUEUED; |
571ecf67 JB |
775 | } |
776 | ||
9ae54c84 | 777 | return RX_CONTINUE; |
571ecf67 JB |
778 | } /* ieee80211_rx_h_sta_process */ |
779 | ||
571ecf67 JB |
780 | static inline struct ieee80211_fragment_entry * |
781 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
782 | unsigned int frag, unsigned int seq, int rx_queue, | |
783 | struct sk_buff **skb) | |
784 | { | |
785 | struct ieee80211_fragment_entry *entry; | |
786 | int idx; | |
787 | ||
788 | idx = sdata->fragment_next; | |
789 | entry = &sdata->fragments[sdata->fragment_next++]; | |
790 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
791 | sdata->fragment_next = 0; | |
792 | ||
793 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 794 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
795 | struct ieee80211_hdr *hdr = |
796 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
0795af57 JP |
797 | DECLARE_MAC_BUF(mac); |
798 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
799 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " |
800 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0795af57 | 801 | "addr1=%s addr2=%s\n", |
571ecf67 JB |
802 | sdata->dev->name, idx, |
803 | jiffies - entry->first_frag_time, entry->seq, | |
0795af57 JP |
804 | entry->last_frag, print_mac(mac, hdr->addr1), |
805 | print_mac(mac2, 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, | |
824 | u16 fc, unsigned int frag, unsigned int seq, | |
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; | |
833 | u16 f_fc; | |
834 | ||
835 | idx--; | |
836 | if (idx < 0) | |
837 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
838 | ||
839 | entry = &sdata->fragments[idx]; | |
840 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
841 | entry->rx_queue != rx_queue || | |
842 | entry->last_frag + 1 != frag) | |
843 | continue; | |
844 | ||
845 | f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data; | |
846 | f_fc = le16_to_cpu(f_hdr->frame_control); | |
847 | ||
848 | if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) || | |
849 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || | |
850 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
851 | continue; | |
852 | ||
ab46623e | 853 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
854 | __skb_queue_purge(&entry->skb_list); |
855 | continue; | |
856 | } | |
857 | return entry; | |
858 | } | |
859 | ||
860 | return NULL; | |
861 | } | |
862 | ||
49461622 | 863 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 864 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
865 | { |
866 | struct ieee80211_hdr *hdr; | |
867 | u16 sc; | |
868 | unsigned int frag, seq; | |
869 | struct ieee80211_fragment_entry *entry; | |
870 | struct sk_buff *skb; | |
0795af57 | 871 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
872 | |
873 | hdr = (struct ieee80211_hdr *) rx->skb->data; | |
874 | sc = le16_to_cpu(hdr->seq_ctrl); | |
875 | frag = sc & IEEE80211_SCTL_FRAG; | |
876 | ||
877 | if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) || | |
878 | (rx->skb)->len < 24 || | |
879 | is_multicast_ether_addr(hdr->addr1))) { | |
880 | /* not fragmented */ | |
881 | goto out; | |
882 | } | |
883 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
884 | ||
885 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
886 | ||
887 | if (frag == 0) { | |
888 | /* This is the first fragment of a new frame. */ | |
889 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 890 | rx->queue, &(rx->skb)); |
8f20fc24 | 891 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
571ecf67 JB |
892 | (rx->fc & IEEE80211_FCTL_PROTECTED)) { |
893 | /* Store CCMP PN so that we can verify that the next | |
894 | * fragment has a sequential PN value. */ | |
895 | entry->ccmp = 1; | |
896 | memcpy(entry->last_pn, | |
5cf121c3 | 897 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
898 | CCMP_PN_LEN); |
899 | } | |
9ae54c84 | 900 | return RX_QUEUED; |
571ecf67 JB |
901 | } |
902 | ||
903 | /* This is a fragment for a frame that should already be pending in | |
904 | * fragment cache. Add this fragment to the end of the pending entry. | |
905 | */ | |
906 | entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq, | |
5cf121c3 | 907 | rx->queue, hdr); |
571ecf67 JB |
908 | if (!entry) { |
909 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 910 | return RX_DROP_MONITOR; |
571ecf67 JB |
911 | } |
912 | ||
913 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
914 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
915 | if (entry->ccmp) { | |
916 | int i; | |
917 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 918 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 919 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
920 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
921 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
922 | pn[i]++; | |
923 | if (pn[i]) | |
924 | break; | |
925 | } | |
5cf121c3 | 926 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 927 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 928 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
929 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
930 | } | |
931 | ||
932 | skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc)); | |
933 | __skb_queue_tail(&entry->skb_list, rx->skb); | |
934 | entry->last_frag = frag; | |
935 | entry->extra_len += rx->skb->len; | |
936 | if (rx->fc & IEEE80211_FCTL_MOREFRAGS) { | |
937 | rx->skb = NULL; | |
9ae54c84 | 938 | return RX_QUEUED; |
571ecf67 JB |
939 | } |
940 | ||
941 | rx->skb = __skb_dequeue(&entry->skb_list); | |
942 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
943 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
944 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
945 | GFP_ATOMIC))) { | |
946 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
947 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 948 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
949 | } |
950 | } | |
951 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
952 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
953 | dev_kfree_skb(skb); | |
954 | } | |
955 | ||
956 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 957 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
958 | |
959 | out: | |
960 | if (rx->sta) | |
961 | rx->sta->rx_packets++; | |
962 | if (is_multicast_ether_addr(hdr->addr1)) | |
963 | rx->local->dot11MulticastReceivedFrameCount++; | |
964 | else | |
965 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 966 | return RX_CONTINUE; |
571ecf67 JB |
967 | } |
968 | ||
49461622 | 969 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 970 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 971 | { |
98f0b0a3 | 972 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
973 | struct sk_buff *skb; |
974 | int no_pending_pkts; | |
0795af57 | 975 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
976 | |
977 | if (likely(!rx->sta || | |
978 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL || | |
979 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL || | |
5cf121c3 | 980 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 981 | return RX_CONTINUE; |
571ecf67 | 982 | |
51fb61e7 JB |
983 | if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) && |
984 | (sdata->vif.type != IEEE80211_IF_TYPE_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 | |
0795af57 JP |
1007 | printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n", |
1008 | print_mac(mac, rx->sta->addr), rx->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 | */ | |
0795af57 | 1031 | printk(KERN_DEBUG "%s: STA %s sent PS Poll even " |
f4ea83dd | 1032 | "though there are no buffered frames for it\n", |
0795af57 | 1033 | rx->dev->name, print_mac(mac, rx->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 HH |
1058 | rx->fc &= ~IEEE80211_STYPE_QOS_DATA; |
1059 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); | |
6e0d114d | 1060 | |
9ae54c84 | 1061 | return RX_CONTINUE; |
6e0d114d JB |
1062 | } |
1063 | ||
76ee65bf | 1064 | static int |
5cf121c3 | 1065 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1066 | { |
07346f81 | 1067 | if (unlikely(!rx->sta || |
f4ea83dd | 1068 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1069 | return -EACCES; |
571ecf67 | 1070 | |
76ee65bf | 1071 | return 0; |
571ecf67 JB |
1072 | } |
1073 | ||
76ee65bf | 1074 | static int |
5cf121c3 | 1075 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx) |
571ecf67 | 1076 | { |
3017b80b | 1077 | /* |
7848ba7d JB |
1078 | * Pass through unencrypted frames if the hardware has |
1079 | * decrypted them already. | |
3017b80b | 1080 | */ |
5cf121c3 | 1081 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1082 | return 0; |
571ecf67 JB |
1083 | |
1084 | /* Drop unencrypted frames if key is set. */ | |
1085 | if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) && | |
1086 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
1087 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC && | |
b3fc9c6c | 1088 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1089 | return -EACCES; |
b3fc9c6c | 1090 | |
76ee65bf | 1091 | return 0; |
571ecf67 JB |
1092 | } |
1093 | ||
76ee65bf | 1094 | static int |
5cf121c3 | 1095 | ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1096 | { |
1097 | struct net_device *dev = rx->dev; | |
571ecf67 JB |
1098 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; |
1099 | u16 fc, hdrlen, ethertype; | |
1100 | u8 *payload; | |
1101 | u8 dst[ETH_ALEN]; | |
c97c23e3 | 1102 | u8 src[ETH_ALEN] __aligned(2); |
76ee65bf | 1103 | struct sk_buff *skb = rx->skb; |
571ecf67 | 1104 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
0795af57 JP |
1105 | DECLARE_MAC_BUF(mac); |
1106 | DECLARE_MAC_BUF(mac2); | |
1107 | DECLARE_MAC_BUF(mac3); | |
1108 | DECLARE_MAC_BUF(mac4); | |
571ecf67 JB |
1109 | |
1110 | fc = rx->fc; | |
571ecf67 JB |
1111 | |
1112 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
76ee65bf | 1113 | return -1; |
571ecf67 JB |
1114 | |
1115 | hdrlen = ieee80211_get_hdrlen(fc); | |
1116 | ||
e32f85f7 LCC |
1117 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1118 | hdrlen += ieee80211_get_mesh_hdrlen( | |
33b64eb2 | 1119 | (struct ieee80211s_hdr *) (skb->data + hdrlen)); |
33b64eb2 | 1120 | |
571ecf67 JB |
1121 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet |
1122 | * header | |
1123 | * IEEE 802.11 address fields: | |
1124 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
1125 | * 0 0 DA SA BSSID n/a | |
1126 | * 0 1 DA BSSID SA n/a | |
1127 | * 1 0 BSSID SA DA n/a | |
1128 | * 1 1 RA TA DA SA | |
1129 | */ | |
1130 | ||
1131 | switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
1132 | case IEEE80211_FCTL_TODS: | |
1133 | /* BSSID SA DA */ | |
1134 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1135 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1136 | ||
51fb61e7 | 1137 | if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP && |
f4ea83dd | 1138 | sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) |
76ee65bf | 1139 | return -1; |
571ecf67 JB |
1140 | break; |
1141 | case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
1142 | /* RA TA DA SA */ | |
1143 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1144 | memcpy(src, hdr->addr4, ETH_ALEN); | |
1145 | ||
33b64eb2 | 1146 | if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS && |
f4ea83dd | 1147 | sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT)) |
76ee65bf | 1148 | return -1; |
571ecf67 JB |
1149 | break; |
1150 | case IEEE80211_FCTL_FROMDS: | |
1151 | /* DA BSSID SA */ | |
1152 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1153 | memcpy(src, hdr->addr3, ETH_ALEN); | |
1154 | ||
51fb61e7 | 1155 | if (sdata->vif.type != IEEE80211_IF_TYPE_STA || |
b3316157 JL |
1156 | (is_multicast_ether_addr(dst) && |
1157 | !compare_ether_addr(src, dev->dev_addr))) | |
76ee65bf | 1158 | return -1; |
571ecf67 JB |
1159 | break; |
1160 | case 0: | |
1161 | /* DA SA BSSID */ | |
1162 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1163 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1164 | ||
f4ea83dd | 1165 | if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS) |
76ee65bf | 1166 | return -1; |
571ecf67 JB |
1167 | break; |
1168 | } | |
1169 | ||
f4ea83dd | 1170 | if (unlikely(skb->len - hdrlen < 8)) |
76ee65bf | 1171 | return -1; |
571ecf67 | 1172 | |
76ee65bf | 1173 | payload = skb->data + hdrlen; |
571ecf67 JB |
1174 | ethertype = (payload[6] << 8) | payload[7]; |
1175 | ||
1176 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1177 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1178 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1179 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1180 | * replace EtherType */ | |
1181 | skb_pull(skb, hdrlen + 6); | |
1182 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1183 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1184 | } else { | |
1185 | struct ethhdr *ehdr; | |
1186 | __be16 len; | |
ce3edf6d | 1187 | |
571ecf67 JB |
1188 | skb_pull(skb, hdrlen); |
1189 | len = htons(skb->len); | |
1190 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1191 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1192 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1193 | ehdr->h_proto = len; | |
1194 | } | |
76ee65bf RR |
1195 | return 0; |
1196 | } | |
571ecf67 | 1197 | |
ce3edf6d JB |
1198 | /* |
1199 | * requires that rx->skb is a frame with ethernet header | |
1200 | */ | |
5cf121c3 | 1201 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx) |
ce3edf6d | 1202 | { |
c97c23e3 | 1203 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1204 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1205 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1206 | ||
1207 | /* | |
1208 | * Allow EAPOL frames to us/the PAE group address regardless | |
1209 | * of whether the frame was encrypted or not. | |
1210 | */ | |
1211 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1212 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1213 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1214 | return true; | |
1215 | ||
1216 | if (ieee80211_802_1x_port_control(rx) || | |
1217 | ieee80211_drop_unencrypted(rx)) | |
1218 | return false; | |
1219 | ||
1220 | return true; | |
1221 | } | |
1222 | ||
1223 | /* | |
1224 | * requires that rx->skb is a frame with ethernet header | |
1225 | */ | |
76ee65bf | 1226 | static void |
5cf121c3 | 1227 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1228 | { |
1229 | struct net_device *dev = rx->dev; | |
1230 | struct ieee80211_local *local = rx->local; | |
1231 | struct sk_buff *skb, *xmit_skb; | |
1232 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1233 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1234 | struct sta_info *dsta; | |
571ecf67 | 1235 | |
76ee65bf RR |
1236 | skb = rx->skb; |
1237 | xmit_skb = NULL; | |
571ecf67 | 1238 | |
51fb61e7 JB |
1239 | if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP || |
1240 | sdata->vif.type == IEEE80211_IF_TYPE_VLAN) && | |
5cf121c3 | 1241 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
ce3edf6d JB |
1242 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1243 | /* | |
1244 | * send multicast frames both to higher layers in | |
1245 | * local net stack and back to the wireless medium | |
1246 | */ | |
76ee65bf RR |
1247 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1248 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1249 | printk(KERN_DEBUG "%s: failed to clone " |
1250 | "multicast frame\n", dev->name); | |
1251 | } else { | |
571ecf67 | 1252 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1253 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1254 | /* |
1255 | * The destination station is associated to | |
1256 | * this AP (in this VLAN), so send the frame | |
1257 | * directly to it and do not pass it to local | |
1258 | * net stack. | |
571ecf67 | 1259 | */ |
76ee65bf | 1260 | xmit_skb = skb; |
571ecf67 JB |
1261 | skb = NULL; |
1262 | } | |
571ecf67 JB |
1263 | } |
1264 | } | |
1265 | ||
1266 | if (skb) { | |
1267 | /* deliver to local stack */ | |
1268 | skb->protocol = eth_type_trans(skb, dev); | |
1269 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1270 | netif_rx(skb); | |
1271 | } | |
1272 | ||
76ee65bf | 1273 | if (xmit_skb) { |
571ecf67 | 1274 | /* send to wireless media */ |
f831e909 | 1275 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1276 | skb_reset_network_header(xmit_skb); |
1277 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1278 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1279 | } |
76ee65bf RR |
1280 | } |
1281 | ||
49461622 | 1282 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1283 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f RR |
1284 | { |
1285 | struct net_device *dev = rx->dev; | |
1286 | struct ieee80211_local *local = rx->local; | |
1287 | u16 fc, ethertype; | |
1288 | u8 *payload; | |
1289 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
1290 | const struct ethhdr *eth; | |
1291 | int remaining, err; | |
1292 | u8 dst[ETH_ALEN]; | |
1293 | u8 src[ETH_ALEN]; | |
1294 | DECLARE_MAC_BUF(mac); | |
1295 | ||
1296 | fc = rx->fc; | |
1297 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
9ae54c84 | 1298 | return RX_CONTINUE; |
fd4c7f2f RR |
1299 | |
1300 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
e4c26add | 1301 | return RX_DROP_MONITOR; |
fd4c7f2f | 1302 | |
5cf121c3 | 1303 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1304 | return RX_CONTINUE; |
fd4c7f2f RR |
1305 | |
1306 | err = ieee80211_data_to_8023(rx); | |
1307 | if (unlikely(err)) | |
e4c26add | 1308 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1309 | |
1310 | skb->dev = dev; | |
1311 | ||
1312 | dev->stats.rx_packets++; | |
1313 | dev->stats.rx_bytes += skb->len; | |
1314 | ||
1315 | /* skip the wrapping header */ | |
1316 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1317 | if (!eth) | |
e4c26add | 1318 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1319 | |
1320 | while (skb != frame) { | |
1321 | u8 padding; | |
1322 | __be16 len = eth->h_proto; | |
1323 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1324 | ||
1325 | remaining = skb->len; | |
1326 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1327 | memcpy(src, eth->h_source, ETH_ALEN); | |
1328 | ||
1329 | padding = ((4 - subframe_len) & 0x3); | |
1330 | /* the last MSDU has no padding */ | |
f4ea83dd | 1331 | if (subframe_len > remaining) |
e4c26add | 1332 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1333 | |
1334 | skb_pull(skb, sizeof(struct ethhdr)); | |
1335 | /* if last subframe reuse skb */ | |
1336 | if (remaining <= subframe_len + padding) | |
1337 | frame = skb; | |
1338 | else { | |
1339 | frame = dev_alloc_skb(local->hw.extra_tx_headroom + | |
1340 | subframe_len); | |
1341 | ||
1342 | if (frame == NULL) | |
e4c26add | 1343 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1344 | |
1345 | skb_reserve(frame, local->hw.extra_tx_headroom + | |
1346 | sizeof(struct ethhdr)); | |
1347 | memcpy(skb_put(frame, ntohs(len)), skb->data, | |
1348 | ntohs(len)); | |
1349 | ||
1350 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1351 | padding); | |
1352 | if (!eth) { | |
fd4c7f2f | 1353 | dev_kfree_skb(frame); |
e4c26add | 1354 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1355 | } |
1356 | } | |
1357 | ||
ce3edf6d | 1358 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1359 | frame->dev = dev; |
1360 | frame->priority = skb->priority; | |
1361 | rx->skb = frame; | |
1362 | ||
fd4c7f2f RR |
1363 | payload = frame->data; |
1364 | ethertype = (payload[6] << 8) | payload[7]; | |
1365 | ||
1366 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1367 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1368 | compare_ether_addr(payload, | |
1369 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1370 | /* remove RFC1042 or Bridge-Tunnel |
1371 | * encapsulation and replace EtherType */ | |
1372 | skb_pull(frame, 6); | |
1373 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1374 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1375 | } else { | |
ce3edf6d JB |
1376 | memcpy(skb_push(frame, sizeof(__be16)), |
1377 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1378 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1379 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1380 | } | |
1381 | ||
ce3edf6d JB |
1382 | if (!ieee80211_frame_allowed(rx)) { |
1383 | if (skb == frame) /* last frame */ | |
e4c26add | 1384 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1385 | dev_kfree_skb(frame); |
1386 | continue; | |
1387 | } | |
fd4c7f2f RR |
1388 | |
1389 | ieee80211_deliver_skb(rx); | |
1390 | } | |
1391 | ||
9ae54c84 | 1392 | return RX_QUEUED; |
fd4c7f2f RR |
1393 | } |
1394 | ||
e32f85f7 LCC |
1395 | static ieee80211_rx_result debug_noinline |
1396 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) | |
1397 | { | |
1398 | struct ieee80211_hdr *hdr; | |
1399 | struct ieee80211s_hdr *mesh_hdr; | |
1400 | unsigned int hdrlen; | |
1401 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
1402 | ||
1403 | hdr = (struct ieee80211_hdr *) skb->data; | |
1404 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1405 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1406 | ||
1407 | if (!ieee80211_is_data(hdr->frame_control)) | |
1408 | return RX_CONTINUE; | |
1409 | ||
1410 | if (!mesh_hdr->ttl) | |
1411 | /* illegal frame */ | |
1412 | return RX_DROP_MONITOR; | |
1413 | ||
1414 | if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0) | |
1415 | return RX_CONTINUE; | |
1416 | ||
1417 | mesh_hdr->ttl--; | |
1418 | ||
1419 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1420 | if (!mesh_hdr->ttl) | |
1421 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.sta, | |
1422 | dropped_frames_ttl); | |
1423 | else { | |
1424 | struct ieee80211_hdr *fwd_hdr; | |
1425 | fwd_skb = skb_copy(skb, GFP_ATOMIC); | |
1426 | ||
1427 | if (!fwd_skb && net_ratelimit()) | |
1428 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
1429 | rx->dev->name); | |
1430 | ||
1431 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
1432 | /* | |
1433 | * Save TA to addr1 to send TA a path error if a | |
1434 | * suitable next hop is not found | |
1435 | */ | |
1436 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN); | |
1437 | memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN); | |
1438 | fwd_skb->dev = rx->local->mdev; | |
1439 | fwd_skb->iif = rx->dev->ifindex; | |
1440 | dev_queue_xmit(fwd_skb); | |
1441 | } | |
1442 | } | |
1443 | ||
1444 | if (is_multicast_ether_addr(hdr->addr3) || | |
1445 | rx->dev->flags & IFF_PROMISC) | |
1446 | return RX_CONTINUE; | |
1447 | else | |
1448 | return RX_DROP_MONITOR; | |
1449 | } | |
1450 | ||
1451 | ||
49461622 | 1452 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1453 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1454 | { |
1455 | struct net_device *dev = rx->dev; | |
1456 | u16 fc; | |
ce3edf6d | 1457 | int err; |
76ee65bf RR |
1458 | |
1459 | fc = rx->fc; | |
1460 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
9ae54c84 | 1461 | return RX_CONTINUE; |
76ee65bf RR |
1462 | |
1463 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
e4c26add | 1464 | return RX_DROP_MONITOR; |
76ee65bf | 1465 | |
76ee65bf RR |
1466 | err = ieee80211_data_to_8023(rx); |
1467 | if (unlikely(err)) | |
e4c26add | 1468 | return RX_DROP_UNUSABLE; |
76ee65bf | 1469 | |
ce3edf6d | 1470 | if (!ieee80211_frame_allowed(rx)) |
e4c26add | 1471 | return RX_DROP_MONITOR; |
ce3edf6d | 1472 | |
76ee65bf RR |
1473 | rx->skb->dev = dev; |
1474 | ||
1475 | dev->stats.rx_packets++; | |
1476 | dev->stats.rx_bytes += rx->skb->len; | |
1477 | ||
1478 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1479 | |
9ae54c84 | 1480 | return RX_QUEUED; |
571ecf67 JB |
1481 | } |
1482 | ||
49461622 | 1483 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1484 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1485 | { |
1486 | struct ieee80211_local *local = rx->local; | |
1487 | struct ieee80211_hw *hw = &local->hw; | |
1488 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1489 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1490 | struct tid_ampdu_rx *tid_agg_rx; |
1491 | u16 start_seq_num; | |
1492 | u16 tid; | |
1493 | ||
a7767f95 | 1494 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1495 | return RX_CONTINUE; |
71364716 | 1496 | |
a7767f95 | 1497 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1498 | if (!rx->sta) |
9ae54c84 | 1499 | return RX_CONTINUE; |
71364716 | 1500 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1501 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1502 | != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1503 | return RX_CONTINUE; |
cee24a3e | 1504 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1505 | |
1506 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1507 | ||
1508 | /* reset session timer */ | |
1509 | if (tid_agg_rx->timeout) { | |
1510 | unsigned long expires = | |
1511 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
1512 | mod_timer(&tid_agg_rx->session_timer, expires); | |
1513 | } | |
1514 | ||
1515 | /* manage reordering buffer according to requested */ | |
1516 | /* sequence number */ | |
1517 | rcu_read_lock(); | |
1518 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, | |
1519 | start_seq_num, 1); | |
1520 | rcu_read_unlock(); | |
e4c26add | 1521 | return RX_DROP_UNUSABLE; |
71364716 RR |
1522 | } |
1523 | ||
9ae54c84 | 1524 | return RX_CONTINUE; |
71364716 RR |
1525 | } |
1526 | ||
49461622 | 1527 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1528 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1529 | { |
1530 | struct ieee80211_sub_if_data *sdata; | |
1531 | ||
5cf121c3 | 1532 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1533 | return RX_DROP_MONITOR; |
571ecf67 JB |
1534 | |
1535 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
51fb61e7 | 1536 | if ((sdata->vif.type == IEEE80211_IF_TYPE_STA || |
33b64eb2 LCC |
1537 | sdata->vif.type == IEEE80211_IF_TYPE_IBSS || |
1538 | sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) && | |
ddd3d2be | 1539 | !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)) |
5cf121c3 | 1540 | ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->status); |
f9d540ee | 1541 | else |
e4c26add | 1542 | return RX_DROP_MONITOR; |
f9d540ee | 1543 | |
9ae54c84 | 1544 | return RX_QUEUED; |
571ecf67 JB |
1545 | } |
1546 | ||
571ecf67 JB |
1547 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, |
1548 | struct ieee80211_hdr *hdr, | |
5cf121c3 | 1549 | struct ieee80211_rx_data *rx) |
571ecf67 | 1550 | { |
a7767f95 HH |
1551 | int keyidx; |
1552 | unsigned int hdrlen; | |
0795af57 JP |
1553 | DECLARE_MAC_BUF(mac); |
1554 | DECLARE_MAC_BUF(mac2); | |
571ecf67 | 1555 | |
a7767f95 | 1556 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1557 | if (rx->skb->len >= hdrlen + 4) |
1558 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1559 | else | |
1560 | keyidx = -1; | |
1561 | ||
8944b79f | 1562 | if (!rx->sta) { |
aa0daf0e JB |
1563 | /* |
1564 | * Some hardware seem to generate incorrect Michael MIC | |
1565 | * reports; ignore them to avoid triggering countermeasures. | |
1566 | */ | |
571ecf67 JB |
1567 | goto ignore; |
1568 | } | |
1569 | ||
a7767f95 | 1570 | if (!ieee80211_has_protected(hdr->frame_control)) |
571ecf67 | 1571 | goto ignore; |
571ecf67 | 1572 | |
51fb61e7 | 1573 | if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) { |
aa0daf0e JB |
1574 | /* |
1575 | * APs with pairwise keys should never receive Michael MIC | |
1576 | * errors for non-zero keyidx because these are reserved for | |
1577 | * group keys and only the AP is sending real multicast | |
1578 | * frames in the BSS. | |
1579 | */ | |
eb063c17 | 1580 | goto ignore; |
571ecf67 JB |
1581 | } |
1582 | ||
a7767f95 HH |
1583 | if (!ieee80211_is_data(hdr->frame_control) && |
1584 | !ieee80211_is_auth(hdr->frame_control)) | |
571ecf67 | 1585 | goto ignore; |
571ecf67 | 1586 | |
eb063c17 | 1587 | mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr); |
571ecf67 JB |
1588 | ignore: |
1589 | dev_kfree_skb(rx->skb); | |
1590 | rx->skb = NULL; | |
1591 | } | |
1592 | ||
5cf121c3 JB |
1593 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
1594 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) | |
3d30d949 MW |
1595 | { |
1596 | struct ieee80211_sub_if_data *sdata; | |
1597 | struct ieee80211_local *local = rx->local; | |
1598 | struct ieee80211_rtap_hdr { | |
1599 | struct ieee80211_radiotap_header hdr; | |
1600 | u8 flags; | |
1601 | u8 rate; | |
1602 | __le16 chan_freq; | |
1603 | __le16 chan_flags; | |
1604 | } __attribute__ ((packed)) *rthdr; | |
1605 | struct sk_buff *skb = rx->skb, *skb2; | |
1606 | struct net_device *prev_dev = NULL; | |
5cf121c3 | 1607 | struct ieee80211_rx_status *status = rx->status; |
3d30d949 | 1608 | |
5cf121c3 | 1609 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1610 | goto out_free_skb; |
1611 | ||
1612 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1613 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1614 | goto out_free_skb; | |
1615 | ||
1616 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1617 | memset(rthdr, 0, sizeof(*rthdr)); | |
1618 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1619 | rthdr->hdr.it_present = | |
1620 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1621 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1622 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1623 | ||
5cf121c3 | 1624 | rthdr->rate = rx->rate->bitrate / 5; |
3d30d949 MW |
1625 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1626 | ||
1627 | if (status->band == IEEE80211_BAND_5GHZ) | |
1628 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1629 | IEEE80211_CHAN_5GHZ); | |
1630 | else | |
1631 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1632 | IEEE80211_CHAN_2GHZ); | |
1633 | ||
1634 | skb_set_mac_header(skb, 0); | |
1635 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1636 | skb->pkt_type = PACKET_OTHERHOST; | |
1637 | skb->protocol = htons(ETH_P_802_2); | |
1638 | ||
1639 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1640 | if (!netif_running(sdata->dev)) | |
1641 | continue; | |
1642 | ||
1643 | if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR || | |
1644 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) | |
1645 | continue; | |
1646 | ||
1647 | if (prev_dev) { | |
1648 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1649 | if (skb2) { | |
1650 | skb2->dev = prev_dev; | |
1651 | netif_rx(skb2); | |
1652 | } | |
1653 | } | |
1654 | ||
1655 | prev_dev = sdata->dev; | |
1656 | sdata->dev->stats.rx_packets++; | |
1657 | sdata->dev->stats.rx_bytes += skb->len; | |
1658 | } | |
1659 | ||
1660 | if (prev_dev) { | |
1661 | skb->dev = prev_dev; | |
1662 | netif_rx(skb); | |
1663 | skb = NULL; | |
1664 | } else | |
1665 | goto out_free_skb; | |
1666 | ||
5cf121c3 | 1667 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
1668 | return; |
1669 | ||
1670 | out_free_skb: | |
1671 | dev_kfree_skb(skb); | |
1672 | } | |
1673 | ||
571ecf67 | 1674 | |
8944b79f | 1675 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1676 | struct ieee80211_rx_data *rx, |
8944b79f | 1677 | struct sk_buff *skb) |
58905290 | 1678 | { |
58905290 JB |
1679 | ieee80211_rx_result res = RX_DROP_MONITOR; |
1680 | ||
8944b79f JB |
1681 | rx->skb = skb; |
1682 | rx->sdata = sdata; | |
1683 | rx->dev = sdata->dev; | |
1684 | ||
e32f85f7 LCC |
1685 | #define CALL_RXH(rxh) \ |
1686 | do { \ | |
1687 | res = rxh(rx); \ | |
1688 | if (res != RX_CONTINUE) \ | |
1689 | goto rxh_done; \ | |
1690 | } while (0); | |
49461622 JB |
1691 | |
1692 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
1693 | CALL_RXH(ieee80211_rx_h_check) | |
1694 | CALL_RXH(ieee80211_rx_h_decrypt) | |
1695 | CALL_RXH(ieee80211_rx_h_sta_process) | |
1696 | CALL_RXH(ieee80211_rx_h_defragment) | |
1697 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
1698 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
1699 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
1700 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
1701 | CALL_RXH(ieee80211_rx_h_amsdu) | |
e32f85f7 LCC |
1702 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1703 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
49461622 JB |
1704 | CALL_RXH(ieee80211_rx_h_data) |
1705 | CALL_RXH(ieee80211_rx_h_ctrl) | |
1706 | CALL_RXH(ieee80211_rx_h_mgmt) | |
1707 | ||
1708 | #undef CALL_RXH | |
1709 | ||
1710 | rxh_done: | |
58905290 JB |
1711 | switch (res) { |
1712 | case RX_DROP_MONITOR: | |
49461622 JB |
1713 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1714 | if (rx->sta) | |
1715 | rx->sta->rx_dropped++; | |
1716 | /* fall through */ | |
1717 | case RX_CONTINUE: | |
3d30d949 MW |
1718 | ieee80211_rx_cooked_monitor(rx); |
1719 | break; | |
58905290 | 1720 | case RX_DROP_UNUSABLE: |
49461622 JB |
1721 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1722 | if (rx->sta) | |
1723 | rx->sta->rx_dropped++; | |
58905290 JB |
1724 | dev_kfree_skb(rx->skb); |
1725 | break; | |
49461622 JB |
1726 | case RX_QUEUED: |
1727 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
1728 | break; | |
58905290 JB |
1729 | } |
1730 | } | |
1731 | ||
571ecf67 JB |
1732 | /* main receive path */ |
1733 | ||
23a24def | 1734 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1735 | u8 *bssid, struct ieee80211_rx_data *rx, |
23a24def JB |
1736 | struct ieee80211_hdr *hdr) |
1737 | { | |
1738 | int multicast = is_multicast_ether_addr(hdr->addr1); | |
1739 | ||
51fb61e7 | 1740 | switch (sdata->vif.type) { |
23a24def JB |
1741 | case IEEE80211_IF_TYPE_STA: |
1742 | if (!bssid) | |
1743 | return 0; | |
1744 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
5cf121c3 | 1745 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1746 | return 0; |
5cf121c3 | 1747 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1748 | } else if (!multicast && |
1749 | compare_ether_addr(sdata->dev->dev_addr, | |
1750 | hdr->addr1) != 0) { | |
4150c572 | 1751 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1752 | return 0; |
5cf121c3 | 1753 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1754 | } |
1755 | break; | |
1756 | case IEEE80211_IF_TYPE_IBSS: | |
1757 | if (!bssid) | |
1758 | return 0; | |
a7767f95 | 1759 | if (ieee80211_is_beacon(hdr->frame_control)) { |
87291c02 VK |
1760 | if (!rx->sta) |
1761 | rx->sta = ieee80211_ibss_add_sta(sdata->dev, | |
1762 | rx->skb, bssid, hdr->addr2, | |
1763 | BIT(rx->status->rate_idx)); | |
9d9bf77d | 1764 | return 1; |
87291c02 | 1765 | } |
9d9bf77d | 1766 | else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { |
5cf121c3 | 1767 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1768 | return 0; |
5cf121c3 | 1769 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1770 | } else if (!multicast && |
1771 | compare_ether_addr(sdata->dev->dev_addr, | |
1772 | hdr->addr1) != 0) { | |
4150c572 | 1773 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1774 | return 0; |
5cf121c3 | 1775 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1776 | } else if (!rx->sta) |
1777 | rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb, | |
87291c02 VK |
1778 | bssid, hdr->addr2, |
1779 | BIT(rx->status->rate_idx)); | |
23a24def | 1780 | break; |
6032f934 JB |
1781 | case IEEE80211_IF_TYPE_MESH_POINT: |
1782 | if (!multicast && | |
1783 | compare_ether_addr(sdata->dev->dev_addr, | |
1784 | hdr->addr1) != 0) { | |
1785 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
1786 | return 0; | |
1787 | ||
5cf121c3 | 1788 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
1789 | } |
1790 | break; | |
fb1c1cd6 | 1791 | case IEEE80211_IF_TYPE_VLAN: |
23a24def JB |
1792 | case IEEE80211_IF_TYPE_AP: |
1793 | if (!bssid) { | |
1794 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1795 | hdr->addr1)) | |
1796 | return 0; | |
1797 | } else if (!ieee80211_bssid_match(bssid, | |
1798 | sdata->dev->dev_addr)) { | |
5cf121c3 | 1799 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1800 | return 0; |
5cf121c3 | 1801 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 1802 | } |
23a24def JB |
1803 | break; |
1804 | case IEEE80211_IF_TYPE_WDS: | |
a7767f95 | 1805 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
1806 | return 0; |
1807 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
1808 | return 0; | |
1809 | break; | |
fb1c1cd6 JB |
1810 | case IEEE80211_IF_TYPE_MNTR: |
1811 | /* take everything */ | |
1812 | break; | |
a2897552 | 1813 | case IEEE80211_IF_TYPE_INVALID: |
fb1c1cd6 JB |
1814 | /* should never get here */ |
1815 | WARN_ON(1); | |
1816 | break; | |
23a24def JB |
1817 | } |
1818 | ||
1819 | return 1; | |
1820 | } | |
1821 | ||
571ecf67 | 1822 | /* |
6368e4b1 RR |
1823 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
1824 | * be called with rcu_read_lock protection. | |
571ecf67 | 1825 | */ |
71ebb4aa RR |
1826 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
1827 | struct sk_buff *skb, | |
1828 | struct ieee80211_rx_status *status, | |
8318d78a | 1829 | struct ieee80211_rate *rate) |
571ecf67 JB |
1830 | { |
1831 | struct ieee80211_local *local = hw_to_local(hw); | |
1832 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 1833 | struct ieee80211_hdr *hdr; |
5cf121c3 | 1834 | struct ieee80211_rx_data rx; |
571ecf67 | 1835 | u16 type; |
6368e4b1 | 1836 | int prepares; |
8e6f0032 JB |
1837 | struct ieee80211_sub_if_data *prev = NULL; |
1838 | struct sk_buff *skb_new; | |
1839 | u8 *bssid; | |
571ecf67 JB |
1840 | |
1841 | hdr = (struct ieee80211_hdr *) skb->data; | |
1842 | memset(&rx, 0, sizeof(rx)); | |
1843 | rx.skb = skb; | |
1844 | rx.local = local; | |
1845 | ||
5cf121c3 | 1846 | rx.status = status; |
5cf121c3 | 1847 | rx.rate = rate; |
b2e7771e | 1848 | rx.fc = le16_to_cpu(hdr->frame_control); |
571ecf67 | 1849 | type = rx.fc & IEEE80211_FCTL_FTYPE; |
72abd81b | 1850 | |
b2e7771e | 1851 | if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT) |
571ecf67 | 1852 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 1853 | |
8944b79f JB |
1854 | rx.sta = sta_info_get(local, hdr->addr2); |
1855 | if (rx.sta) { | |
d0709a65 JB |
1856 | rx.sdata = rx.sta->sdata; |
1857 | rx.dev = rx.sta->sdata->dev; | |
b2e7771e | 1858 | } |
571ecf67 | 1859 | |
571ecf67 | 1860 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
8944b79f | 1861 | ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx); |
d0709a65 | 1862 | return; |
571ecf67 JB |
1863 | } |
1864 | ||
ece8eddd | 1865 | if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning)) |
5cf121c3 | 1866 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 1867 | |
38f3714d JB |
1868 | ieee80211_parse_qos(&rx); |
1869 | ieee80211_verify_ip_alignment(&rx); | |
1870 | ||
571ecf67 JB |
1871 | skb = rx.skb; |
1872 | ||
79010420 | 1873 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
1874 | if (!netif_running(sdata->dev)) |
1875 | continue; | |
1876 | ||
51fb61e7 | 1877 | if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) |
b2e7771e JB |
1878 | continue; |
1879 | ||
51fb61e7 | 1880 | bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); |
5cf121c3 | 1881 | rx.flags |= IEEE80211_RX_RA_MATCH; |
6368e4b1 | 1882 | prepares = prepare_for_handlers(sdata, bssid, &rx, hdr); |
23a24def | 1883 | |
6368e4b1 | 1884 | if (!prepares) |
23a24def | 1885 | continue; |
8e6f0032 | 1886 | |
340e11f3 JB |
1887 | /* |
1888 | * frame is destined for this interface, but if it's not | |
1889 | * also for the previous one we handle that after the | |
1890 | * loop to avoid copying the SKB once too much | |
1891 | */ | |
1892 | ||
1893 | if (!prev) { | |
1894 | prev = sdata; | |
1895 | continue; | |
8e6f0032 | 1896 | } |
340e11f3 JB |
1897 | |
1898 | /* | |
1899 | * frame was destined for the previous interface | |
1900 | * so invoke RX handlers for it | |
1901 | */ | |
1902 | ||
1903 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
1904 | if (!skb_new) { | |
1905 | if (net_ratelimit()) | |
1906 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 1907 | "multicast frame for %s\n", |
dd1cd4c6 JB |
1908 | wiphy_name(local->hw.wiphy), |
1909 | prev->dev->name); | |
340e11f3 JB |
1910 | continue; |
1911 | } | |
69f817b6 | 1912 | rx.fc = le16_to_cpu(hdr->frame_control); |
8944b79f | 1913 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 1914 | prev = sdata; |
571ecf67 | 1915 | } |
8e6f0032 | 1916 | if (prev) { |
69f817b6 | 1917 | rx.fc = le16_to_cpu(hdr->frame_control); |
8944b79f | 1918 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
8e6f0032 JB |
1919 | } else |
1920 | dev_kfree_skb(skb); | |
571ecf67 | 1921 | } |
6368e4b1 | 1922 | |
b580781e RR |
1923 | #define SEQ_MODULO 0x1000 |
1924 | #define SEQ_MASK 0xfff | |
1925 | ||
1926 | static inline int seq_less(u16 sq1, u16 sq2) | |
1927 | { | |
1928 | return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1)); | |
1929 | } | |
1930 | ||
1931 | static inline u16 seq_inc(u16 sq) | |
1932 | { | |
1933 | return ((sq + 1) & SEQ_MASK); | |
1934 | } | |
1935 | ||
1936 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
1937 | { | |
1938 | return ((sq1 - sq2) & SEQ_MASK); | |
1939 | } | |
1940 | ||
1941 | ||
71364716 RR |
1942 | /* |
1943 | * As it function blongs to Rx path it must be called with | |
1944 | * the proper rcu_read_lock protection for its flow. | |
1945 | */ | |
b580781e RR |
1946 | u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
1947 | struct tid_ampdu_rx *tid_agg_rx, | |
1948 | struct sk_buff *skb, u16 mpdu_seq_num, | |
1949 | int bar_req) | |
1950 | { | |
1951 | struct ieee80211_local *local = hw_to_local(hw); | |
1952 | struct ieee80211_rx_status status; | |
1953 | u16 head_seq_num, buf_size; | |
1954 | int index; | |
8318d78a JB |
1955 | struct ieee80211_supported_band *sband; |
1956 | struct ieee80211_rate *rate; | |
b580781e RR |
1957 | |
1958 | buf_size = tid_agg_rx->buf_size; | |
1959 | head_seq_num = tid_agg_rx->head_seq_num; | |
1960 | ||
1961 | /* frame with out of date sequence number */ | |
1962 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
1963 | dev_kfree_skb(skb); | |
1964 | return 1; | |
1965 | } | |
1966 | ||
1967 | /* if frame sequence number exceeds our buffering window size or | |
1968 | * block Ack Request arrived - release stored frames */ | |
1969 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
1970 | /* new head to the ordering buffer */ | |
1971 | if (bar_req) | |
1972 | head_seq_num = mpdu_seq_num; | |
1973 | else | |
1974 | head_seq_num = | |
1975 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
1976 | /* release stored frames up to new head to stack */ | |
1977 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
1978 | index = seq_sub(tid_agg_rx->head_seq_num, | |
1979 | tid_agg_rx->ssn) | |
1980 | % tid_agg_rx->buf_size; | |
1981 | ||
1982 | if (tid_agg_rx->reorder_buf[index]) { | |
1983 | /* release the reordered frames to stack */ | |
1984 | memcpy(&status, | |
1985 | tid_agg_rx->reorder_buf[index]->cb, | |
1986 | sizeof(status)); | |
8318d78a JB |
1987 | sband = local->hw.wiphy->bands[status.band]; |
1988 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e RR |
1989 | __ieee80211_rx_handle_packet(hw, |
1990 | tid_agg_rx->reorder_buf[index], | |
9e72ebd6 | 1991 | &status, rate); |
b580781e RR |
1992 | tid_agg_rx->stored_mpdu_num--; |
1993 | tid_agg_rx->reorder_buf[index] = NULL; | |
1994 | } | |
1995 | tid_agg_rx->head_seq_num = | |
1996 | seq_inc(tid_agg_rx->head_seq_num); | |
1997 | } | |
1998 | if (bar_req) | |
1999 | return 1; | |
2000 | } | |
2001 | ||
2002 | /* now the new frame is always in the range of the reordering */ | |
2003 | /* buffer window */ | |
2004 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
2005 | % tid_agg_rx->buf_size; | |
2006 | /* check if we already stored this frame */ | |
2007 | if (tid_agg_rx->reorder_buf[index]) { | |
2008 | dev_kfree_skb(skb); | |
2009 | return 1; | |
2010 | } | |
2011 | ||
2012 | /* if arrived mpdu is in the right order and nothing else stored */ | |
2013 | /* release it immediately */ | |
2014 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
2015 | tid_agg_rx->stored_mpdu_num == 0) { | |
2016 | tid_agg_rx->head_seq_num = | |
2017 | seq_inc(tid_agg_rx->head_seq_num); | |
2018 | return 0; | |
2019 | } | |
2020 | ||
2021 | /* put the frame in the reordering buffer */ | |
2022 | tid_agg_rx->reorder_buf[index] = skb; | |
2023 | tid_agg_rx->stored_mpdu_num++; | |
2024 | /* release the buffer until next missing frame */ | |
2025 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
2026 | % tid_agg_rx->buf_size; | |
2027 | while (tid_agg_rx->reorder_buf[index]) { | |
2028 | /* release the reordered frame back to stack */ | |
2029 | memcpy(&status, tid_agg_rx->reorder_buf[index]->cb, | |
2030 | sizeof(status)); | |
8318d78a JB |
2031 | sband = local->hw.wiphy->bands[status.band]; |
2032 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e | 2033 | __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index], |
9e72ebd6 | 2034 | &status, rate); |
b580781e RR |
2035 | tid_agg_rx->stored_mpdu_num--; |
2036 | tid_agg_rx->reorder_buf[index] = NULL; | |
2037 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2038 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2039 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2040 | } | |
2041 | return 1; | |
2042 | } | |
2043 | ||
71ebb4aa RR |
2044 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
2045 | struct sk_buff *skb) | |
b580781e RR |
2046 | { |
2047 | struct ieee80211_hw *hw = &local->hw; | |
2048 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2049 | struct sta_info *sta; | |
2050 | struct tid_ampdu_rx *tid_agg_rx; | |
87228f57 | 2051 | u16 sc; |
b580781e | 2052 | u16 mpdu_seq_num; |
182503ab | 2053 | u8 ret = 0; |
b580781e RR |
2054 | int tid; |
2055 | ||
2056 | sta = sta_info_get(local, hdr->addr2); | |
2057 | if (!sta) | |
2058 | return ret; | |
2059 | ||
b580781e RR |
2060 | /* filter the QoS data rx stream according to |
2061 | * STA/TID and check if this STA/TID is on aggregation */ | |
87228f57 | 2062 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
b580781e RR |
2063 | goto end_reorder; |
2064 | ||
238f74a2 | 2065 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
b580781e | 2066 | |
cee24a3e | 2067 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
b580781e RR |
2068 | goto end_reorder; |
2069 | ||
cee24a3e RR |
2070 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2071 | ||
2560b6e2 EG |
2072 | /* qos null data frames are excluded */ |
2073 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
b580781e RR |
2074 | goto end_reorder; |
2075 | ||
2076 | /* new un-ordered ampdu frame - process it */ | |
2077 | ||
2078 | /* reset session timer */ | |
2079 | if (tid_agg_rx->timeout) { | |
2080 | unsigned long expires = | |
2081 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
2082 | mod_timer(&tid_agg_rx->session_timer, expires); | |
2083 | } | |
2084 | ||
2085 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2086 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2087 | if (sc & IEEE80211_SCTL_FRAG) { | |
d0709a65 | 2088 | ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr, |
b580781e RR |
2089 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
2090 | ret = 1; | |
2091 | goto end_reorder; | |
2092 | } | |
2093 | ||
2094 | /* according to mpdu sequence number deal with reordering buffer */ | |
2095 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
2096 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, | |
2097 | mpdu_seq_num, 0); | |
d0709a65 | 2098 | end_reorder: |
b580781e RR |
2099 | return ret; |
2100 | } | |
2101 | ||
6368e4b1 RR |
2102 | /* |
2103 | * This is the receive path handler. It is called by a low level driver when an | |
2104 | * 802.11 MPDU is received from the hardware. | |
2105 | */ | |
2106 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2107 | struct ieee80211_rx_status *status) | |
2108 | { | |
2109 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2110 | struct ieee80211_rate *rate = NULL; |
2111 | struct ieee80211_supported_band *sband; | |
2112 | ||
2113 | if (status->band < 0 || | |
13d8fd2d | 2114 | status->band >= IEEE80211_NUM_BANDS) { |
8318d78a JB |
2115 | WARN_ON(1); |
2116 | return; | |
2117 | } | |
2118 | ||
2119 | sband = local->hw.wiphy->bands[status->band]; | |
2120 | ||
2121 | if (!sband || | |
2122 | status->rate_idx < 0 || | |
2123 | status->rate_idx >= sband->n_bitrates) { | |
2124 | WARN_ON(1); | |
2125 | return; | |
2126 | } | |
2127 | ||
2128 | rate = &sband->bitrates[status->rate_idx]; | |
6368e4b1 RR |
2129 | |
2130 | /* | |
2131 | * key references and virtual interfaces are protected using RCU | |
2132 | * and this requires that we are in a read-side RCU section during | |
2133 | * receive processing | |
2134 | */ | |
2135 | rcu_read_lock(); | |
2136 | ||
2137 | /* | |
2138 | * Frames with failed FCS/PLCP checksum are not returned, | |
2139 | * all other frames are returned without radiotap header | |
2140 | * if it was previously present. | |
2141 | * Also, frames with less than 16 bytes are dropped. | |
2142 | */ | |
8318d78a | 2143 | skb = ieee80211_rx_monitor(local, skb, status, rate); |
6368e4b1 RR |
2144 | if (!skb) { |
2145 | rcu_read_unlock(); | |
2146 | return; | |
2147 | } | |
2148 | ||
b580781e | 2149 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
9e72ebd6 | 2150 | __ieee80211_rx_handle_packet(hw, skb, status, rate); |
6368e4b1 RR |
2151 | |
2152 | rcu_read_unlock(); | |
2153 | } | |
571ecf67 JB |
2154 | EXPORT_SYMBOL(__ieee80211_rx); |
2155 | ||
2156 | /* This is a version of the rx handler that can be called from hard irq | |
2157 | * context. Post the skb on the queue and schedule the tasklet */ | |
2158 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2159 | struct ieee80211_rx_status *status) | |
2160 | { | |
2161 | struct ieee80211_local *local = hw_to_local(hw); | |
2162 | ||
2163 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2164 | ||
2165 | skb->dev = local->mdev; | |
2166 | /* copy status into skb->cb for use by tasklet */ | |
2167 | memcpy(skb->cb, status, sizeof(*status)); | |
2168 | skb->pkt_type = IEEE80211_RX_MSG; | |
2169 | skb_queue_tail(&local->skb_queue, skb); | |
2170 | tasklet_schedule(&local->tasklet); | |
2171 | } | |
2172 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |