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" | |
24487981 | 22 | #include "driver-ops.h" |
2c8dccc7 | 23 | #include "led.h" |
33b64eb2 | 24 | #include "mesh.h" |
571ecf67 JB |
25 | #include "wep.h" |
26 | #include "wpa.h" | |
27 | #include "tkip.h" | |
28 | #include "wme.h" | |
29 | ||
c6a1fa12 JB |
30 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
31 | struct tid_ampdu_rx *tid_agg_rx, | |
32 | struct sk_buff *skb, | |
33 | u16 mpdu_seq_num, | |
34 | int bar_req); | |
b2e7771e JB |
35 | /* |
36 | * monitor mode reception | |
37 | * | |
38 | * This function cleans up the SKB, i.e. it removes all the stuff | |
39 | * only useful for monitoring. | |
40 | */ | |
41 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
42 | struct sk_buff *skb, | |
43 | int rtap_len) | |
44 | { | |
45 | skb_pull(skb, rtap_len); | |
46 | ||
47 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { | |
48 | if (likely(skb->len > FCS_LEN)) | |
49 | skb_trim(skb, skb->len - FCS_LEN); | |
50 | else { | |
51 | /* driver bug */ | |
52 | WARN_ON(1); | |
53 | dev_kfree_skb(skb); | |
54 | skb = NULL; | |
55 | } | |
56 | } | |
57 | ||
58 | return skb; | |
59 | } | |
60 | ||
f1d58c25 | 61 | static inline int should_drop_frame(struct sk_buff *skb, |
b2e7771e JB |
62 | int present_fcs_len, |
63 | int radiotap_len) | |
64 | { | |
f1d58c25 | 65 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
182503ab | 66 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b2e7771e JB |
67 | |
68 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
69 | return 1; | |
70 | if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len)) | |
71 | return 1; | |
87228f57 HH |
72 | if (ieee80211_is_ctl(hdr->frame_control) && |
73 | !ieee80211_is_pspoll(hdr->frame_control) && | |
74 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
75 | return 1; |
76 | return 0; | |
77 | } | |
78 | ||
601ae7f2 BR |
79 | static int |
80 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
81 | struct ieee80211_rx_status *status) | |
82 | { | |
83 | int len; | |
84 | ||
85 | /* always present fields */ | |
86 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
87 | ||
88 | if (status->flag & RX_FLAG_TSFT) | |
89 | len += 8; | |
7fee5372 | 90 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
601ae7f2 BR |
91 | len += 1; |
92 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) | |
93 | len += 1; | |
94 | ||
95 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
96 | len++; | |
97 | ||
98 | /* make sure radiotap starts at a naturally aligned address */ | |
99 | if (len % 8) | |
100 | len = roundup(len, 8); | |
101 | ||
102 | return len; | |
103 | } | |
104 | ||
d1c3a37c | 105 | /* |
601ae7f2 BR |
106 | * ieee80211_add_rx_radiotap_header - add radiotap header |
107 | * | |
108 | * add a radiotap header containing all the fields which the hardware provided. | |
109 | */ | |
110 | static void | |
111 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
112 | struct sk_buff *skb, | |
601ae7f2 BR |
113 | struct ieee80211_rate *rate, |
114 | int rtap_len) | |
115 | { | |
f1d58c25 | 116 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
601ae7f2 BR |
117 | struct ieee80211_radiotap_header *rthdr; |
118 | unsigned char *pos; | |
119 | ||
120 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
121 | memset(rthdr, 0, rtap_len); | |
122 | ||
123 | /* radiotap header, set always present flags */ | |
124 | rthdr->it_present = | |
125 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
601ae7f2 BR |
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; | |
aae89831 JB |
146 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
147 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; | |
b4f28bbb BR |
148 | if (status->flag & RX_FLAG_SHORTPRE) |
149 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
150 | pos++; |
151 | ||
152 | /* IEEE80211_RADIOTAP_RATE */ | |
0fb8ca45 JM |
153 | if (status->flag & RX_FLAG_HT) { |
154 | /* | |
155 | * TODO: add following information into radiotap header once | |
156 | * suitable fields are defined for it: | |
157 | * - MCS index (status->rate_idx) | |
158 | * - HT40 (status->flag & RX_FLAG_40MHZ) | |
159 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) | |
160 | */ | |
161 | *pos = 0; | |
8d6f658e | 162 | } else { |
ebe6c7ba | 163 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
0fb8ca45 | 164 | *pos = rate->bitrate / 5; |
8d6f658e | 165 | } |
601ae7f2 BR |
166 | pos++; |
167 | ||
168 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
169 | *(__le16 *)pos = cpu_to_le16(status->freq); | |
170 | pos += 2; | |
171 | if (status->band == IEEE80211_BAND_5GHZ) | |
172 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
173 | IEEE80211_CHAN_5GHZ); | |
9deb1ae5 BR |
174 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
175 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
176 | IEEE80211_CHAN_2GHZ); | |
601ae7f2 | 177 | else |
9deb1ae5 | 178 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK | |
601ae7f2 BR |
179 | IEEE80211_CHAN_2GHZ); |
180 | pos += 2; | |
181 | ||
182 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
183 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
184 | *pos = status->signal; | |
185 | rthdr->it_present |= | |
186 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
187 | pos++; | |
188 | } | |
189 | ||
190 | /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ | |
191 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { | |
192 | *pos = status->noise; | |
193 | rthdr->it_present |= | |
194 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); | |
195 | pos++; | |
196 | } | |
197 | ||
198 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ | |
199 | ||
200 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
201 | *pos = status->antenna; | |
202 | pos++; | |
203 | ||
601ae7f2 BR |
204 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
205 | ||
206 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
207 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
208 | if ((pos - (unsigned char *)rthdr) & 1) | |
209 | pos++; | |
aae89831 JB |
210 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
211 | *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADPLCP); | |
601ae7f2 BR |
212 | pos += 2; |
213 | } | |
214 | ||
b2e7771e JB |
215 | /* |
216 | * This function copies a received frame to all monitor interfaces and | |
217 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
218 | * radiotap header the driver might have added. | |
219 | */ | |
220 | static struct sk_buff * | |
221 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a | 222 | struct ieee80211_rate *rate) |
b2e7771e | 223 | { |
f1d58c25 | 224 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
b2e7771e | 225 | struct ieee80211_sub_if_data *sdata; |
b2e7771e | 226 | int needed_headroom = 0; |
b2e7771e JB |
227 | struct sk_buff *skb, *skb2; |
228 | struct net_device *prev_dev = NULL; | |
229 | int present_fcs_len = 0; | |
230 | int rtap_len = 0; | |
231 | ||
232 | /* | |
233 | * First, we may need to make a copy of the skb because | |
234 | * (1) we need to modify it for radiotap (if not present), and | |
235 | * (2) the other RX handlers will modify the skb we got. | |
236 | * | |
237 | * We don't need to, of course, if we aren't going to return | |
238 | * the SKB because it has a bad FCS/PLCP checksum. | |
239 | */ | |
240 | if (status->flag & RX_FLAG_RADIOTAP) | |
241 | rtap_len = ieee80211_get_radiotap_len(origskb->data); | |
242 | else | |
601ae7f2 BR |
243 | /* room for the radiotap header based on driver features */ |
244 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
245 | |
246 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
247 | present_fcs_len = FCS_LEN; | |
248 | ||
249 | if (!local->monitors) { | |
f1d58c25 | 250 | if (should_drop_frame(origskb, present_fcs_len, rtap_len)) { |
b2e7771e JB |
251 | dev_kfree_skb(origskb); |
252 | return NULL; | |
253 | } | |
254 | ||
255 | return remove_monitor_info(local, origskb, rtap_len); | |
256 | } | |
257 | ||
f1d58c25 | 258 | if (should_drop_frame(origskb, present_fcs_len, rtap_len)) { |
b2e7771e JB |
259 | /* only need to expand headroom if necessary */ |
260 | skb = origskb; | |
261 | origskb = NULL; | |
262 | ||
263 | /* | |
264 | * This shouldn't trigger often because most devices have an | |
265 | * RX header they pull before we get here, and that should | |
266 | * be big enough for our radiotap information. We should | |
267 | * probably export the length to drivers so that we can have | |
268 | * them allocate enough headroom to start with. | |
269 | */ | |
270 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 271 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
272 | dev_kfree_skb(skb); |
273 | return NULL; | |
274 | } | |
275 | } else { | |
276 | /* | |
277 | * Need to make a copy and possibly remove radiotap header | |
278 | * and FCS from the original. | |
279 | */ | |
280 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
281 | ||
282 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
283 | ||
284 | if (!skb) | |
285 | return origskb; | |
286 | } | |
287 | ||
288 | /* if necessary, prepend radiotap information */ | |
601ae7f2 | 289 | if (!(status->flag & RX_FLAG_RADIOTAP)) |
f1d58c25 | 290 | ieee80211_add_rx_radiotap_header(local, skb, rate, |
601ae7f2 | 291 | needed_headroom); |
b2e7771e | 292 | |
ce3edf6d | 293 | skb_reset_mac_header(skb); |
b2e7771e JB |
294 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
295 | skb->pkt_type = PACKET_OTHERHOST; | |
296 | skb->protocol = htons(ETH_P_802_2); | |
297 | ||
298 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
299 | if (!netif_running(sdata->dev)) | |
300 | continue; | |
301 | ||
05c914fe | 302 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
303 | continue; |
304 | ||
3d30d949 MW |
305 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
306 | continue; | |
307 | ||
b2e7771e JB |
308 | if (prev_dev) { |
309 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
310 | if (skb2) { | |
311 | skb2->dev = prev_dev; | |
312 | netif_rx(skb2); | |
313 | } | |
314 | } | |
315 | ||
316 | prev_dev = sdata->dev; | |
317 | sdata->dev->stats.rx_packets++; | |
318 | sdata->dev->stats.rx_bytes += skb->len; | |
319 | } | |
320 | ||
321 | if (prev_dev) { | |
322 | skb->dev = prev_dev; | |
323 | netif_rx(skb); | |
324 | } else | |
325 | dev_kfree_skb(skb); | |
326 | ||
327 | return origskb; | |
328 | } | |
329 | ||
330 | ||
5cf121c3 | 331 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 332 | { |
238f74a2 | 333 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
334 | int tid; |
335 | ||
336 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
337 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
338 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 339 | /* frame has qos control */ |
238f74a2 HH |
340 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
341 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 342 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 343 | else |
5cf121c3 | 344 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 345 | } else { |
1411f9b5 JB |
346 | /* |
347 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
348 | * | |
349 | * Sequence numbers for management frames, QoS data | |
350 | * frames with a broadcast/multicast address in the | |
351 | * Address 1 field, and all non-QoS data frames sent | |
352 | * by QoS STAs are assigned using an additional single | |
353 | * modulo-4096 counter, [...] | |
354 | * | |
355 | * We also use that counter for non-QoS STAs. | |
356 | */ | |
357 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 358 | } |
52865dfd | 359 | |
5cf121c3 | 360 | rx->queue = tid; |
6e0d114d JB |
361 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
362 | * For now, set skb->priority to 0 for other cases. */ | |
363 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 364 | } |
6e0d114d | 365 | |
d1c3a37c JB |
366 | /** |
367 | * DOC: Packet alignment | |
368 | * | |
369 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
370 | * to the stack. | |
371 | * | |
372 | * Additionally, should, if possible, align the payload data in a way that | |
373 | * guarantees that the contained IP header is aligned to a four-byte | |
374 | * boundary. In the case of regular frames, this simply means aligning the | |
375 | * payload to a four-byte boundary (because either the IP header is directly | |
376 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
377 | * in front of it). | |
378 | * | |
379 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
380 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
381 | * push the IP header further back to a multiple of four again. Thankfully, the | |
382 | * specs were sane enough this time around to require padding each A-MSDU | |
383 | * subframe to a length that is a multiple of four. | |
384 | * | |
385 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
386 | * the payload is not supported, the driver is required to move the 802.11 | |
387 | * header to be directly in front of the payload in that case. | |
388 | */ | |
389 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 390 | { |
a7767f95 | 391 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
38f3714d JB |
392 | int hdrlen; |
393 | ||
d1c3a37c JB |
394 | #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT |
395 | return; | |
396 | #endif | |
397 | ||
398 | if (WARN_ONCE((unsigned long)rx->skb->data & 1, | |
399 | "unaligned packet at 0x%p\n", rx->skb->data)) | |
400 | return; | |
401 | ||
a7767f95 | 402 | if (!ieee80211_is_data_present(hdr->frame_control)) |
38f3714d JB |
403 | return; |
404 | ||
a7767f95 | 405 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
5cf121c3 | 406 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d | 407 | hdrlen += ETH_HLEN; |
d1c3a37c JB |
408 | WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3, |
409 | "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen); | |
6e0d114d JB |
410 | } |
411 | ||
6368e4b1 | 412 | |
571ecf67 JB |
413 | /* rx handlers */ |
414 | ||
49461622 | 415 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 416 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
417 | { |
418 | struct ieee80211_local *local = rx->local; | |
419 | struct sk_buff *skb = rx->skb; | |
420 | ||
c2b13452 | 421 | if (unlikely(local->hw_scanning)) |
f1d58c25 | 422 | return ieee80211_scan_rx(rx->sdata, skb); |
ece8eddd | 423 | |
c2b13452 | 424 | if (unlikely(local->sw_scanning)) { |
ece8eddd | 425 | /* drop all the other packets during a software scan anyway */ |
f1d58c25 | 426 | if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) |
ece8eddd | 427 | dev_kfree_skb(skb); |
9ae54c84 | 428 | return RX_QUEUED; |
571ecf67 JB |
429 | } |
430 | ||
5cf121c3 | 431 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
432 | /* scanning finished during invoking of handlers */ |
433 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 434 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
435 | } |
436 | ||
9ae54c84 | 437 | return RX_CONTINUE; |
571ecf67 JB |
438 | } |
439 | ||
3cfcf6ac JM |
440 | |
441 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
442 | { | |
443 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
444 | ||
445 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
446 | return 0; | |
447 | ||
448 | return ieee80211_is_robust_mgmt_frame(hdr); | |
449 | } | |
450 | ||
451 | ||
452 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
453 | { | |
454 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
455 | ||
456 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
457 | return 0; | |
458 | ||
459 | return ieee80211_is_robust_mgmt_frame(hdr); | |
460 | } | |
461 | ||
462 | ||
463 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
464 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
465 | { | |
466 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
467 | struct ieee80211_mmie *mmie; | |
468 | ||
469 | if (skb->len < 24 + sizeof(*mmie) || | |
470 | !is_multicast_ether_addr(hdr->da)) | |
471 | return -1; | |
472 | ||
473 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
474 | return -1; /* not a robust management frame */ | |
475 | ||
476 | mmie = (struct ieee80211_mmie *) | |
477 | (skb->data + skb->len - sizeof(*mmie)); | |
478 | if (mmie->element_id != WLAN_EID_MMIE || | |
479 | mmie->length != sizeof(*mmie) - 2) | |
480 | return -1; | |
481 | ||
482 | return le16_to_cpu(mmie->key_id); | |
483 | } | |
484 | ||
485 | ||
33b64eb2 | 486 | static ieee80211_rx_result |
5cf121c3 | 487 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 488 | { |
a7767f95 HH |
489 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
490 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
d6d1a5a7 | 491 | |
a7767f95 HH |
492 | if (ieee80211_is_data(hdr->frame_control)) { |
493 | if (!ieee80211_has_a4(hdr->frame_control)) | |
33b64eb2 LCC |
494 | return RX_DROP_MONITOR; |
495 | if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0) | |
496 | return RX_DROP_MONITOR; | |
497 | } | |
498 | ||
499 | /* If there is not an established peer link and this is not a peer link | |
500 | * establisment frame, beacon or probe, drop the frame. | |
501 | */ | |
502 | ||
b4e08ea1 | 503 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 504 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 505 | |
a7767f95 | 506 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
507 | return RX_DROP_MONITOR; |
508 | ||
a7767f95 | 509 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 LCC |
510 | mgmt = (struct ieee80211_mgmt *)hdr; |
511 | if (mgmt->u.action.category != PLINK_CATEGORY) | |
512 | return RX_DROP_MONITOR; | |
33b64eb2 | 513 | return RX_CONTINUE; |
33b64eb2 LCC |
514 | } |
515 | ||
a7767f95 HH |
516 | if (ieee80211_is_probe_req(hdr->frame_control) || |
517 | ieee80211_is_probe_resp(hdr->frame_control) || | |
518 | ieee80211_is_beacon(hdr->frame_control)) | |
519 | return RX_CONTINUE; | |
520 | ||
521 | return RX_DROP_MONITOR; | |
522 | ||
523 | } | |
524 | ||
525 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
526 | ||
527 | if (ieee80211_is_data(hdr->frame_control) && | |
528 | is_multicast_ether_addr(hdr->addr1) && | |
f698d856 | 529 | mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 530 | return RX_DROP_MONITOR; |
902acc78 | 531 | #undef msh_h_get |
d6d1a5a7 | 532 | |
902acc78 JB |
533 | return RX_CONTINUE; |
534 | } | |
33b64eb2 LCC |
535 | |
536 | ||
49461622 | 537 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 538 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 539 | { |
a7767f95 | 540 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
541 | |
542 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
543 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 544 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 545 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 546 | hdr->seq_ctrl)) { |
5cf121c3 | 547 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
548 | rx->local->dot11FrameDuplicateCount++; |
549 | rx->sta->num_duplicates++; | |
550 | } | |
e4c26add | 551 | return RX_DROP_MONITOR; |
571ecf67 | 552 | } else |
5cf121c3 | 553 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
554 | } |
555 | ||
571ecf67 JB |
556 | if (unlikely(rx->skb->len < 16)) { |
557 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 558 | return RX_DROP_MONITOR; |
571ecf67 JB |
559 | } |
560 | ||
571ecf67 JB |
561 | /* Drop disallowed frame classes based on STA auth/assoc state; |
562 | * IEEE 802.11, Chap 5.5. | |
563 | * | |
ccd7b362 JB |
564 | * mac80211 filters only based on association state, i.e. it drops |
565 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
566 | * deauth/disassoc frames when needed. In addition, hostapd is |
567 | * responsible for filtering on both auth and assoc states. | |
568 | */ | |
33b64eb2 | 569 | |
902acc78 | 570 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 571 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 572 | |
a7767f95 HH |
573 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
574 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 575 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 576 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
577 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
578 | !ieee80211_has_tods(hdr->frame_control) && | |
579 | ieee80211_is_data(hdr->frame_control)) || | |
580 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
581 | /* Drop IBSS frames and frames for other hosts |
582 | * silently. */ | |
e4c26add | 583 | return RX_DROP_MONITOR; |
571ecf67 JB |
584 | } |
585 | ||
e4c26add | 586 | return RX_DROP_MONITOR; |
571ecf67 JB |
587 | } |
588 | ||
9ae54c84 | 589 | return RX_CONTINUE; |
570bd537 JB |
590 | } |
591 | ||
592 | ||
49461622 | 593 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 594 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 595 | { |
a7767f95 | 596 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
3017b80b JB |
597 | int keyidx; |
598 | int hdrlen; | |
e4c26add | 599 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 600 | struct ieee80211_key *stakey = NULL; |
3cfcf6ac | 601 | int mmie_keyidx = -1; |
570bd537 | 602 | |
3017b80b JB |
603 | /* |
604 | * Key selection 101 | |
605 | * | |
3cfcf6ac | 606 | * There are four types of keys: |
3017b80b | 607 | * - GTK (group keys) |
3cfcf6ac | 608 | * - IGTK (group keys for management frames) |
3017b80b JB |
609 | * - PTK (pairwise keys) |
610 | * - STK (station-to-station pairwise keys) | |
611 | * | |
612 | * When selecting a key, we have to distinguish between multicast | |
613 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
614 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
615 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
616 | * unicast frames can also use key indices like GTKs. Hence, if we | |
617 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 618 | * |
8dc06a1c JB |
619 | * Note that in a regular BSS, multicast frames are sent by the |
620 | * AP only, associated stations unicast the frame to the AP first | |
621 | * which then multicasts it on their behalf. | |
622 | * | |
3017b80b JB |
623 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
624 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
625 | * The spec seems to expect that one negotiates the same key with |
626 | * every station but there's no such requirement; VLANs could be | |
627 | * possible. | |
3017b80b JB |
628 | */ |
629 | ||
3017b80b | 630 | /* |
1990af8d | 631 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
632 | * addressed to us nor a multicast frame. |
633 | */ | |
5cf121c3 | 634 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 635 | return RX_CONTINUE; |
3017b80b | 636 | |
d4e46a3d JB |
637 | if (rx->sta) |
638 | stakey = rcu_dereference(rx->sta->key); | |
639 | ||
0c7c10c7 JM |
640 | if (!ieee80211_has_protected(hdr->frame_control)) |
641 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); | |
642 | ||
d4e46a3d JB |
643 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { |
644 | rx->key = stakey; | |
0c7c10c7 JM |
645 | /* Skip decryption if the frame is not protected. */ |
646 | if (!ieee80211_has_protected(hdr->frame_control)) | |
647 | return RX_CONTINUE; | |
3cfcf6ac JM |
648 | } else if (mmie_keyidx >= 0) { |
649 | /* Broadcast/multicast robust management frame / BIP */ | |
650 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && | |
651 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
652 | return RX_CONTINUE; | |
653 | ||
654 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
655 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
656 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
657 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
0c7c10c7 JM |
658 | } else if (!ieee80211_has_protected(hdr->frame_control)) { |
659 | /* | |
660 | * The frame was not protected, so skip decryption. However, we | |
661 | * need to set rx->key if there is a key that could have been | |
662 | * used so that the frame may be dropped if encryption would | |
663 | * have been expected. | |
664 | */ | |
665 | struct ieee80211_key *key = NULL; | |
666 | if (ieee80211_is_mgmt(hdr->frame_control) && | |
667 | is_multicast_ether_addr(hdr->addr1) && | |
668 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
669 | rx->key = key; | |
670 | else if ((key = rcu_dereference(rx->sdata->default_key))) | |
671 | rx->key = key; | |
672 | return RX_CONTINUE; | |
571ecf67 | 673 | } else { |
3017b80b JB |
674 | /* |
675 | * The device doesn't give us the IV so we won't be | |
676 | * able to look up the key. That's ok though, we | |
677 | * don't need to decrypt the frame, we just won't | |
678 | * be able to keep statistics accurate. | |
679 | * Except for key threshold notifications, should | |
680 | * we somehow allow the driver to tell us which key | |
681 | * the hardware used if this flag is set? | |
682 | */ | |
5cf121c3 JB |
683 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
684 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 685 | return RX_CONTINUE; |
3017b80b | 686 | |
a7767f95 | 687 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
688 | |
689 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 690 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
691 | |
692 | /* | |
693 | * no need to call ieee80211_wep_get_keyidx, | |
694 | * it verifies a bunch of things we've done already | |
695 | */ | |
696 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
697 | ||
d4e46a3d | 698 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
699 | |
700 | /* | |
701 | * RSNA-protected unicast frames should always be sent with | |
702 | * pairwise or station-to-station keys, but for WEP we allow | |
703 | * using a key index as well. | |
704 | */ | |
8f20fc24 | 705 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
706 | !is_multicast_ether_addr(hdr->addr1)) |
707 | rx->key = NULL; | |
571ecf67 JB |
708 | } |
709 | ||
3017b80b | 710 | if (rx->key) { |
571ecf67 | 711 | rx->key->tx_rx_count++; |
011bfcc4 | 712 | /* TODO: add threshold stuff again */ |
1990af8d | 713 | } else { |
e4c26add | 714 | return RX_DROP_MONITOR; |
70f08765 JB |
715 | } |
716 | ||
1990af8d JB |
717 | /* Check for weak IVs if possible */ |
718 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 719 | ieee80211_is_data(hdr->frame_control) && |
5cf121c3 JB |
720 | (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
721 | !(rx->status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
722 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
723 | rx->sta->wep_weak_iv_count++; | |
724 | ||
70f08765 JB |
725 | switch (rx->key->conf.alg) { |
726 | case ALG_WEP: | |
e2f036da MN |
727 | result = ieee80211_crypto_wep_decrypt(rx); |
728 | break; | |
70f08765 | 729 | case ALG_TKIP: |
e2f036da MN |
730 | result = ieee80211_crypto_tkip_decrypt(rx); |
731 | break; | |
70f08765 | 732 | case ALG_CCMP: |
e2f036da MN |
733 | result = ieee80211_crypto_ccmp_decrypt(rx); |
734 | break; | |
3cfcf6ac JM |
735 | case ALG_AES_CMAC: |
736 | result = ieee80211_crypto_aes_cmac_decrypt(rx); | |
737 | break; | |
70f08765 JB |
738 | } |
739 | ||
e2f036da | 740 | /* either the frame has been decrypted or will be dropped */ |
5cf121c3 | 741 | rx->status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
742 | |
743 | return result; | |
70f08765 JB |
744 | } |
745 | ||
572e0012 KV |
746 | static ieee80211_rx_result debug_noinline |
747 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
748 | { | |
749 | struct ieee80211_local *local; | |
750 | struct ieee80211_hdr *hdr; | |
751 | struct sk_buff *skb; | |
752 | ||
753 | local = rx->local; | |
754 | skb = rx->skb; | |
755 | hdr = (struct ieee80211_hdr *) skb->data; | |
756 | ||
757 | if (!local->pspolling) | |
758 | return RX_CONTINUE; | |
759 | ||
760 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
761 | /* this is not from AP */ | |
762 | return RX_CONTINUE; | |
763 | ||
764 | if (!ieee80211_is_data(hdr->frame_control)) | |
765 | return RX_CONTINUE; | |
766 | ||
767 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
768 | /* AP has no more frames buffered for us */ | |
769 | local->pspolling = false; | |
770 | return RX_CONTINUE; | |
771 | } | |
772 | ||
773 | /* more data bit is set, let's request a new frame from the AP */ | |
774 | ieee80211_send_pspoll(local, rx->sdata); | |
775 | ||
776 | return RX_CONTINUE; | |
777 | } | |
778 | ||
133b8226 | 779 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 780 | { |
133b8226 | 781 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 782 | struct ieee80211_local *local = sdata->local; |
0795af57 | 783 | |
3e122be0 | 784 | atomic_inc(&sdata->bss->num_sta_ps); |
07346f81 | 785 | set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL); |
24487981 | 786 | drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta); |
571ecf67 | 787 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
788 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
789 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 JB |
790 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
791 | } | |
792 | ||
133b8226 | 793 | static int ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 794 | { |
133b8226 JB |
795 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
796 | struct ieee80211_local *local = sdata->local; | |
8f77f384 | 797 | int sent, buffered; |
571ecf67 | 798 | |
3e122be0 | 799 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 800 | |
07346f81 | 801 | clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL); |
24487981 | 802 | drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta); |
004c872e JB |
803 | |
804 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
805 | sta_info_clear_tim_bit(sta); | |
806 | ||
571ecf67 | 807 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
808 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
809 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 | 810 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 811 | |
571ecf67 | 812 | /* Send all buffered frames to the station */ |
8f77f384 JB |
813 | sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered); |
814 | buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf); | |
815 | sent += buffered; | |
816 | local->total_ps_buffered -= buffered; | |
817 | ||
571ecf67 | 818 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
8f77f384 JB |
819 | printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames " |
820 | "since STA not sleeping anymore\n", sdata->dev->name, | |
821 | sta->sta.addr, sta->sta.aid, sent - buffered, buffered); | |
571ecf67 | 822 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
823 | |
824 | return sent; | |
825 | } | |
826 | ||
49461622 | 827 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 828 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
829 | { |
830 | struct sta_info *sta = rx->sta; | |
a7767f95 | 831 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
832 | |
833 | if (!sta) | |
9ae54c84 | 834 | return RX_CONTINUE; |
571ecf67 JB |
835 | |
836 | /* Update last_rx only for IBSS packets which are for the current | |
837 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
838 | * other STAs are using different BSSID. */ | |
05c914fe | 839 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 840 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 841 | NL80211_IFTYPE_ADHOC); |
46900298 | 842 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 JB |
843 | sta->last_rx = jiffies; |
844 | } else | |
845 | if (!is_multicast_ether_addr(hdr->addr1) || | |
05c914fe | 846 | rx->sdata->vif.type == NL80211_IFTYPE_STATION) { |
571ecf67 JB |
847 | /* Update last_rx only for unicast frames in order to prevent |
848 | * the Probe Request frames (the only broadcast frames from a | |
849 | * STA in infrastructure mode) from keeping a connection alive. | |
33b64eb2 LCC |
850 | * Mesh beacons will update last_rx when if they are found to |
851 | * match the current local configuration when processed. | |
571ecf67 | 852 | */ |
15b7b062 KV |
853 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION && |
854 | ieee80211_is_beacon(hdr->frame_control)) { | |
855 | rx->sdata->u.mgd.last_beacon = jiffies; | |
856 | } else | |
857 | sta->last_rx = jiffies; | |
571ecf67 JB |
858 | } |
859 | ||
5cf121c3 | 860 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 861 | return RX_CONTINUE; |
571ecf67 | 862 | |
3cf335d5 KV |
863 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
864 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
865 | ||
571ecf67 JB |
866 | sta->rx_fragments++; |
867 | sta->rx_bytes += rx->skb->len; | |
5cf121c3 | 868 | sta->last_signal = rx->status->signal; |
566bfe5a | 869 | sta->last_qual = rx->status->qual; |
5cf121c3 | 870 | sta->last_noise = rx->status->noise; |
571ecf67 | 871 | |
72eaa43a JB |
872 | /* |
873 | * Change STA power saving mode only at the end of a frame | |
874 | * exchange sequence. | |
875 | */ | |
3e122be0 | 876 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
877 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
878 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
72eaa43a JB |
879 | if (test_sta_flags(sta, WLAN_STA_PS)) { |
880 | /* | |
881 | * Ignore doze->wake transitions that are | |
882 | * indicated by non-data frames, the standard | |
883 | * is unclear here, but for example going to | |
884 | * PS mode and then scanning would cause a | |
885 | * doze->wake transition for the probe request, | |
886 | * and that is clearly undesirable. | |
887 | */ | |
888 | if (ieee80211_is_data(hdr->frame_control) && | |
889 | !ieee80211_has_pm(hdr->frame_control)) | |
890 | rx->sent_ps_buffered += ap_sta_ps_end(sta); | |
891 | } else { | |
892 | if (ieee80211_has_pm(hdr->frame_control)) | |
893 | ap_sta_ps_start(sta); | |
894 | } | |
571ecf67 JB |
895 | } |
896 | ||
897 | /* Drop data::nullfunc frames silently, since they are used only to | |
898 | * control station power saving mode. */ | |
a7767f95 | 899 | if (ieee80211_is_nullfunc(hdr->frame_control)) { |
571ecf67 JB |
900 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
901 | /* Update counter and free packet here to avoid counting this | |
902 | * as a dropped packed. */ | |
903 | sta->rx_packets++; | |
904 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 905 | return RX_QUEUED; |
571ecf67 JB |
906 | } |
907 | ||
9ae54c84 | 908 | return RX_CONTINUE; |
571ecf67 JB |
909 | } /* ieee80211_rx_h_sta_process */ |
910 | ||
571ecf67 JB |
911 | static inline struct ieee80211_fragment_entry * |
912 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
913 | unsigned int frag, unsigned int seq, int rx_queue, | |
914 | struct sk_buff **skb) | |
915 | { | |
916 | struct ieee80211_fragment_entry *entry; | |
917 | int idx; | |
918 | ||
919 | idx = sdata->fragment_next; | |
920 | entry = &sdata->fragments[sdata->fragment_next++]; | |
921 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
922 | sdata->fragment_next = 0; | |
923 | ||
924 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 925 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
926 | struct ieee80211_hdr *hdr = |
927 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
928 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
929 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 930 | "addr1=%pM addr2=%pM\n", |
571ecf67 JB |
931 | sdata->dev->name, idx, |
932 | jiffies - entry->first_frag_time, entry->seq, | |
0c68ae26 | 933 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 934 | #endif |
571ecf67 JB |
935 | __skb_queue_purge(&entry->skb_list); |
936 | } | |
937 | ||
938 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
939 | *skb = NULL; | |
940 | entry->first_frag_time = jiffies; | |
941 | entry->seq = seq; | |
942 | entry->rx_queue = rx_queue; | |
943 | entry->last_frag = frag; | |
944 | entry->ccmp = 0; | |
945 | entry->extra_len = 0; | |
946 | ||
947 | return entry; | |
948 | } | |
949 | ||
950 | static inline struct ieee80211_fragment_entry * | |
951 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 952 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
953 | int rx_queue, struct ieee80211_hdr *hdr) |
954 | { | |
955 | struct ieee80211_fragment_entry *entry; | |
956 | int i, idx; | |
957 | ||
958 | idx = sdata->fragment_next; | |
959 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
960 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
961 | |
962 | idx--; | |
963 | if (idx < 0) | |
964 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
965 | ||
966 | entry = &sdata->fragments[idx]; | |
967 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
968 | entry->rx_queue != rx_queue || | |
969 | entry->last_frag + 1 != frag) | |
970 | continue; | |
971 | ||
b73d70ad | 972 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 973 | |
b73d70ad HH |
974 | /* |
975 | * Check ftype and addresses are equal, else check next fragment | |
976 | */ | |
977 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
978 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
979 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
980 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
981 | continue; | |
982 | ||
ab46623e | 983 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
984 | __skb_queue_purge(&entry->skb_list); |
985 | continue; | |
986 | } | |
987 | return entry; | |
988 | } | |
989 | ||
990 | return NULL; | |
991 | } | |
992 | ||
49461622 | 993 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 994 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
995 | { |
996 | struct ieee80211_hdr *hdr; | |
997 | u16 sc; | |
358c8d9d | 998 | __le16 fc; |
571ecf67 JB |
999 | unsigned int frag, seq; |
1000 | struct ieee80211_fragment_entry *entry; | |
1001 | struct sk_buff *skb; | |
1002 | ||
b73d70ad | 1003 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 1004 | fc = hdr->frame_control; |
571ecf67 JB |
1005 | sc = le16_to_cpu(hdr->seq_ctrl); |
1006 | frag = sc & IEEE80211_SCTL_FRAG; | |
1007 | ||
358c8d9d | 1008 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1009 | (rx->skb)->len < 24 || |
1010 | is_multicast_ether_addr(hdr->addr1))) { | |
1011 | /* not fragmented */ | |
1012 | goto out; | |
1013 | } | |
1014 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1015 | ||
1016 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
1017 | ||
1018 | if (frag == 0) { | |
1019 | /* This is the first fragment of a new frame. */ | |
1020 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1021 | rx->queue, &(rx->skb)); |
8f20fc24 | 1022 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 1023 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
1024 | /* Store CCMP PN so that we can verify that the next |
1025 | * fragment has a sequential PN value. */ | |
1026 | entry->ccmp = 1; | |
1027 | memcpy(entry->last_pn, | |
5cf121c3 | 1028 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
1029 | CCMP_PN_LEN); |
1030 | } | |
9ae54c84 | 1031 | return RX_QUEUED; |
571ecf67 JB |
1032 | } |
1033 | ||
1034 | /* This is a fragment for a frame that should already be pending in | |
1035 | * fragment cache. Add this fragment to the end of the pending entry. | |
1036 | */ | |
b73d70ad | 1037 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1038 | if (!entry) { |
1039 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1040 | return RX_DROP_MONITOR; |
571ecf67 JB |
1041 | } |
1042 | ||
1043 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1044 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1045 | if (entry->ccmp) { | |
1046 | int i; | |
1047 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 1048 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 1049 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1050 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1051 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1052 | pn[i]++; | |
1053 | if (pn[i]) | |
1054 | break; | |
1055 | } | |
5cf121c3 | 1056 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 1057 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1058 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1059 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1060 | } | |
1061 | ||
358c8d9d | 1062 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1063 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1064 | entry->last_frag = frag; | |
1065 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1066 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1067 | rx->skb = NULL; |
9ae54c84 | 1068 | return RX_QUEUED; |
571ecf67 JB |
1069 | } |
1070 | ||
1071 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1072 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1073 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1074 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1075 | GFP_ATOMIC))) { | |
1076 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1077 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1078 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1079 | } |
1080 | } | |
1081 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1082 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1083 | dev_kfree_skb(skb); | |
1084 | } | |
1085 | ||
1086 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 1087 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
1088 | |
1089 | out: | |
1090 | if (rx->sta) | |
1091 | rx->sta->rx_packets++; | |
1092 | if (is_multicast_ether_addr(hdr->addr1)) | |
1093 | rx->local->dot11MulticastReceivedFrameCount++; | |
1094 | else | |
1095 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1096 | return RX_CONTINUE; |
571ecf67 JB |
1097 | } |
1098 | ||
49461622 | 1099 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1100 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1101 | { |
98f0b0a3 | 1102 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
1103 | struct sk_buff *skb; |
1104 | int no_pending_pkts; | |
358c8d9d | 1105 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 1106 | |
358c8d9d | 1107 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 1108 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1109 | return RX_CONTINUE; |
571ecf67 | 1110 | |
05c914fe JB |
1111 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1112 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1113 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1114 | |
571ecf67 JB |
1115 | skb = skb_dequeue(&rx->sta->tx_filtered); |
1116 | if (!skb) { | |
1117 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
1118 | if (skb) | |
1119 | rx->local->total_ps_buffered--; | |
1120 | } | |
1121 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
1122 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
1123 | ||
1124 | if (skb) { | |
1125 | struct ieee80211_hdr *hdr = | |
1126 | (struct ieee80211_hdr *) skb->data; | |
1127 | ||
4a9a66e9 JB |
1128 | /* |
1129 | * Tell TX path to send one frame even though the STA may | |
1130 | * still remain is PS mode after this frame exchange. | |
1131 | */ | |
07346f81 | 1132 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); |
571ecf67 JB |
1133 | |
1134 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 JB |
1135 | printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", |
1136 | rx->sta->sta.addr, rx->sta->sta.aid, | |
571ecf67 JB |
1137 | skb_queue_len(&rx->sta->ps_tx_buf)); |
1138 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
1139 | ||
1140 | /* Use MoreData flag to indicate whether there are more | |
1141 | * buffered frames for this STA */ | |
836341a7 | 1142 | if (no_pending_pkts) |
571ecf67 | 1143 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
836341a7 | 1144 | else |
571ecf67 JB |
1145 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
1146 | ||
1147 | dev_queue_xmit(skb); | |
1148 | ||
004c872e JB |
1149 | if (no_pending_pkts) |
1150 | sta_info_clear_tim_bit(rx->sta); | |
571ecf67 | 1151 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
5cf121c3 | 1152 | } else if (!rx->sent_ps_buffered) { |
004c872e JB |
1153 | /* |
1154 | * FIXME: This can be the result of a race condition between | |
1155 | * us expiring a frame and the station polling for it. | |
1156 | * Should we send it a null-func frame indicating we | |
1157 | * have nothing buffered for it? | |
1158 | */ | |
0c68ae26 | 1159 | printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " |
f4ea83dd | 1160 | "though there are no buffered frames for it\n", |
0c68ae26 | 1161 | rx->dev->name, rx->sta->sta.addr); |
571ecf67 | 1162 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
1163 | } |
1164 | ||
9ae54c84 | 1165 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1166 | * count as an dropped frame. */ |
1167 | dev_kfree_skb(rx->skb); | |
1168 | ||
9ae54c84 | 1169 | return RX_QUEUED; |
571ecf67 JB |
1170 | } |
1171 | ||
49461622 | 1172 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1173 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1174 | { |
6e0d114d | 1175 | u8 *data = rx->skb->data; |
238f74a2 | 1176 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1177 | |
238f74a2 | 1178 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1179 | return RX_CONTINUE; |
6e0d114d JB |
1180 | |
1181 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1182 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1183 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1184 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1185 | /* change frame type to non QOS */ |
238f74a2 | 1186 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1187 | |
9ae54c84 | 1188 | return RX_CONTINUE; |
6e0d114d JB |
1189 | } |
1190 | ||
76ee65bf | 1191 | static int |
5cf121c3 | 1192 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1193 | { |
07346f81 | 1194 | if (unlikely(!rx->sta || |
f4ea83dd | 1195 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1196 | return -EACCES; |
571ecf67 | 1197 | |
76ee65bf | 1198 | return 0; |
571ecf67 JB |
1199 | } |
1200 | ||
76ee65bf | 1201 | static int |
358c8d9d | 1202 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1203 | { |
3017b80b | 1204 | /* |
7848ba7d JB |
1205 | * Pass through unencrypted frames if the hardware has |
1206 | * decrypted them already. | |
3017b80b | 1207 | */ |
5cf121c3 | 1208 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1209 | return 0; |
571ecf67 JB |
1210 | |
1211 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1212 | if (unlikely(!ieee80211_has_protected(fc) && |
1213 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1214 | ieee80211_is_data(fc) && |
b3fc9c6c | 1215 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1216 | return -EACCES; |
f2ca3ea4 JM |
1217 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
1218 | if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
1219 | rx->key)) | |
1220 | return -EACCES; | |
1221 | /* BIP does not use Protected field, so need to check MMIE */ | |
1222 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) | |
1223 | && ieee80211_get_mmie_keyidx(rx->skb) < 0 && | |
1224 | rx->key)) | |
1225 | return -EACCES; | |
1226 | /* | |
1227 | * When using MFP, Action frames are not allowed prior to | |
1228 | * having configured keys. | |
1229 | */ | |
1230 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1231 | ieee80211_is_robust_mgmt_frame( | |
1232 | (struct ieee80211_hdr *) rx->skb->data))) | |
1233 | return -EACCES; | |
1234 | } | |
b3fc9c6c | 1235 | |
76ee65bf | 1236 | return 0; |
571ecf67 JB |
1237 | } |
1238 | ||
76ee65bf | 1239 | static int |
e31a16d6 | 1240 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1241 | { |
1242 | struct net_device *dev = rx->dev; | |
571ecf67 JB |
1243 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1244 | ||
e31a16d6 | 1245 | return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type); |
76ee65bf | 1246 | } |
571ecf67 | 1247 | |
ce3edf6d JB |
1248 | /* |
1249 | * requires that rx->skb is a frame with ethernet header | |
1250 | */ | |
358c8d9d | 1251 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1252 | { |
c97c23e3 | 1253 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1254 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1255 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1256 | ||
1257 | /* | |
1258 | * Allow EAPOL frames to us/the PAE group address regardless | |
1259 | * of whether the frame was encrypted or not. | |
1260 | */ | |
1261 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1262 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1263 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1264 | return true; | |
1265 | ||
1266 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1267 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1268 | return false; |
1269 | ||
1270 | return true; | |
1271 | } | |
1272 | ||
1273 | /* | |
1274 | * requires that rx->skb is a frame with ethernet header | |
1275 | */ | |
76ee65bf | 1276 | static void |
5cf121c3 | 1277 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1278 | { |
1279 | struct net_device *dev = rx->dev; | |
1280 | struct ieee80211_local *local = rx->local; | |
1281 | struct sk_buff *skb, *xmit_skb; | |
1282 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1283 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1284 | struct sta_info *dsta; | |
571ecf67 | 1285 | |
76ee65bf RR |
1286 | skb = rx->skb; |
1287 | xmit_skb = NULL; | |
571ecf67 | 1288 | |
05c914fe JB |
1289 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1290 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1291 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
5cf121c3 | 1292 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
ce3edf6d JB |
1293 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1294 | /* | |
1295 | * send multicast frames both to higher layers in | |
1296 | * local net stack and back to the wireless medium | |
1297 | */ | |
76ee65bf RR |
1298 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1299 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1300 | printk(KERN_DEBUG "%s: failed to clone " |
1301 | "multicast frame\n", dev->name); | |
1302 | } else { | |
571ecf67 | 1303 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1304 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1305 | /* |
1306 | * The destination station is associated to | |
1307 | * this AP (in this VLAN), so send the frame | |
1308 | * directly to it and do not pass it to local | |
1309 | * net stack. | |
571ecf67 | 1310 | */ |
76ee65bf | 1311 | xmit_skb = skb; |
571ecf67 JB |
1312 | skb = NULL; |
1313 | } | |
571ecf67 JB |
1314 | } |
1315 | } | |
1316 | ||
1317 | if (skb) { | |
d1c3a37c JB |
1318 | int align __maybe_unused; |
1319 | ||
1320 | #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
1321 | /* | |
1322 | * 'align' will only take the values 0 or 2 here | |
1323 | * since all frames are required to be aligned | |
1324 | * to 2-byte boundaries when being passed to | |
1325 | * mac80211. That also explains the __skb_push() | |
1326 | * below. | |
1327 | */ | |
dacb6f1d | 1328 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1329 | if (align) { |
1330 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1331 | dev_kfree_skb(skb); | |
1332 | skb = NULL; | |
1333 | } else { | |
1334 | u8 *data = skb->data; | |
1335 | size_t len = skb->len; | |
1336 | u8 *new = __skb_push(skb, align); | |
1337 | memmove(new, data, len); | |
1338 | __skb_trim(skb, len); | |
1339 | } | |
1340 | } | |
1341 | #endif | |
1342 | ||
1343 | if (skb) { | |
1344 | /* deliver to local stack */ | |
1345 | skb->protocol = eth_type_trans(skb, dev); | |
1346 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1347 | netif_rx(skb); | |
1348 | } | |
571ecf67 JB |
1349 | } |
1350 | ||
76ee65bf | 1351 | if (xmit_skb) { |
571ecf67 | 1352 | /* send to wireless media */ |
f831e909 | 1353 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1354 | skb_reset_network_header(xmit_skb); |
1355 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1356 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1357 | } |
76ee65bf RR |
1358 | } |
1359 | ||
49461622 | 1360 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1361 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f RR |
1362 | { |
1363 | struct net_device *dev = rx->dev; | |
1364 | struct ieee80211_local *local = rx->local; | |
358c8d9d | 1365 | u16 ethertype; |
fd4c7f2f RR |
1366 | u8 *payload; |
1367 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
358c8d9d HH |
1368 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1369 | __le16 fc = hdr->frame_control; | |
fd4c7f2f RR |
1370 | const struct ethhdr *eth; |
1371 | int remaining, err; | |
1372 | u8 dst[ETH_ALEN]; | |
1373 | u8 src[ETH_ALEN]; | |
fd4c7f2f | 1374 | |
358c8d9d | 1375 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1376 | return RX_CONTINUE; |
fd4c7f2f | 1377 | |
358c8d9d | 1378 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1379 | return RX_DROP_MONITOR; |
fd4c7f2f | 1380 | |
5cf121c3 | 1381 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1382 | return RX_CONTINUE; |
fd4c7f2f | 1383 | |
e31a16d6 | 1384 | err = __ieee80211_data_to_8023(rx); |
fd4c7f2f | 1385 | if (unlikely(err)) |
e4c26add | 1386 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1387 | |
1388 | skb->dev = dev; | |
1389 | ||
1390 | dev->stats.rx_packets++; | |
1391 | dev->stats.rx_bytes += skb->len; | |
1392 | ||
1393 | /* skip the wrapping header */ | |
1394 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1395 | if (!eth) | |
e4c26add | 1396 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1397 | |
1398 | while (skb != frame) { | |
1399 | u8 padding; | |
1400 | __be16 len = eth->h_proto; | |
1401 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1402 | ||
1403 | remaining = skb->len; | |
1404 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1405 | memcpy(src, eth->h_source, ETH_ALEN); | |
1406 | ||
1407 | padding = ((4 - subframe_len) & 0x3); | |
1408 | /* the last MSDU has no padding */ | |
f4ea83dd | 1409 | if (subframe_len > remaining) |
e4c26add | 1410 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1411 | |
1412 | skb_pull(skb, sizeof(struct ethhdr)); | |
1413 | /* if last subframe reuse skb */ | |
1414 | if (remaining <= subframe_len + padding) | |
1415 | frame = skb; | |
1416 | else { | |
d1c3a37c JB |
1417 | /* |
1418 | * Allocate and reserve two bytes more for payload | |
1419 | * alignment since sizeof(struct ethhdr) is 14. | |
1420 | */ | |
1421 | frame = dev_alloc_skb( | |
1422 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1423 | subframe_len + 2); | |
fd4c7f2f RR |
1424 | |
1425 | if (frame == NULL) | |
e4c26add | 1426 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1427 | |
d1c3a37c JB |
1428 | skb_reserve(frame, |
1429 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1430 | sizeof(struct ethhdr) + 2); | |
fd4c7f2f RR |
1431 | memcpy(skb_put(frame, ntohs(len)), skb->data, |
1432 | ntohs(len)); | |
1433 | ||
1434 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1435 | padding); | |
1436 | if (!eth) { | |
fd4c7f2f | 1437 | dev_kfree_skb(frame); |
e4c26add | 1438 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1439 | } |
1440 | } | |
1441 | ||
ce3edf6d | 1442 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1443 | frame->dev = dev; |
1444 | frame->priority = skb->priority; | |
1445 | rx->skb = frame; | |
1446 | ||
fd4c7f2f RR |
1447 | payload = frame->data; |
1448 | ethertype = (payload[6] << 8) | payload[7]; | |
1449 | ||
1450 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1451 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1452 | compare_ether_addr(payload, | |
1453 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1454 | /* remove RFC1042 or Bridge-Tunnel |
1455 | * encapsulation and replace EtherType */ | |
1456 | skb_pull(frame, 6); | |
1457 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1458 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1459 | } else { | |
ce3edf6d JB |
1460 | memcpy(skb_push(frame, sizeof(__be16)), |
1461 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1462 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1463 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1464 | } | |
1465 | ||
358c8d9d | 1466 | if (!ieee80211_frame_allowed(rx, fc)) { |
ce3edf6d | 1467 | if (skb == frame) /* last frame */ |
e4c26add | 1468 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1469 | dev_kfree_skb(frame); |
1470 | continue; | |
1471 | } | |
fd4c7f2f RR |
1472 | |
1473 | ieee80211_deliver_skb(rx); | |
1474 | } | |
1475 | ||
9ae54c84 | 1476 | return RX_QUEUED; |
fd4c7f2f RR |
1477 | } |
1478 | ||
bf94e17b | 1479 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1480 | static ieee80211_rx_result |
e32f85f7 LCC |
1481 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1482 | { | |
1483 | struct ieee80211_hdr *hdr; | |
1484 | struct ieee80211s_hdr *mesh_hdr; | |
1485 | unsigned int hdrlen; | |
1486 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
1487 | ||
1488 | hdr = (struct ieee80211_hdr *) skb->data; | |
1489 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1490 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1491 | ||
1492 | if (!ieee80211_is_data(hdr->frame_control)) | |
1493 | return RX_CONTINUE; | |
1494 | ||
1495 | if (!mesh_hdr->ttl) | |
1496 | /* illegal frame */ | |
1497 | return RX_DROP_MONITOR; | |
1498 | ||
79617dee Y |
1499 | if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){ |
1500 | struct ieee80211_sub_if_data *sdata; | |
1501 | struct mesh_path *mppath; | |
1502 | ||
1503 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1504 | rcu_read_lock(); | |
1505 | mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata); | |
1506 | if (!mppath) { | |
1507 | mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata); | |
1508 | } else { | |
1509 | spin_lock_bh(&mppath->state_lock); | |
1510 | mppath->exp_time = jiffies; | |
1511 | if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0) | |
1512 | memcpy(mppath->mpp, hdr->addr4, ETH_ALEN); | |
1513 | spin_unlock_bh(&mppath->state_lock); | |
1514 | } | |
1515 | rcu_read_unlock(); | |
1516 | } | |
1517 | ||
e32f85f7 LCC |
1518 | if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0) |
1519 | return RX_CONTINUE; | |
1520 | ||
1521 | mesh_hdr->ttl--; | |
1522 | ||
1523 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1524 | if (!mesh_hdr->ttl) | |
472dbc45 | 1525 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1526 | dropped_frames_ttl); |
1527 | else { | |
1528 | struct ieee80211_hdr *fwd_hdr; | |
1529 | fwd_skb = skb_copy(skb, GFP_ATOMIC); | |
1530 | ||
1531 | if (!fwd_skb && net_ratelimit()) | |
1532 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
1533 | rx->dev->name); | |
1534 | ||
1535 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
1536 | /* | |
1537 | * Save TA to addr1 to send TA a path error if a | |
1538 | * suitable next hop is not found | |
1539 | */ | |
1540 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN); | |
1541 | memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN); | |
1542 | fwd_skb->dev = rx->local->mdev; | |
1543 | fwd_skb->iif = rx->dev->ifindex; | |
1544 | dev_queue_xmit(fwd_skb); | |
1545 | } | |
1546 | } | |
1547 | ||
1548 | if (is_multicast_ether_addr(hdr->addr3) || | |
1549 | rx->dev->flags & IFF_PROMISC) | |
1550 | return RX_CONTINUE; | |
1551 | else | |
1552 | return RX_DROP_MONITOR; | |
1553 | } | |
bf94e17b | 1554 | #endif |
e32f85f7 | 1555 | |
49461622 | 1556 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1557 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1558 | { |
1559 | struct net_device *dev = rx->dev; | |
358c8d9d HH |
1560 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1561 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1562 | int err; |
76ee65bf | 1563 | |
358c8d9d | 1564 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1565 | return RX_CONTINUE; |
76ee65bf | 1566 | |
358c8d9d | 1567 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1568 | return RX_DROP_MONITOR; |
76ee65bf | 1569 | |
e31a16d6 | 1570 | err = __ieee80211_data_to_8023(rx); |
76ee65bf | 1571 | if (unlikely(err)) |
e4c26add | 1572 | return RX_DROP_UNUSABLE; |
76ee65bf | 1573 | |
358c8d9d | 1574 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1575 | return RX_DROP_MONITOR; |
ce3edf6d | 1576 | |
76ee65bf RR |
1577 | rx->skb->dev = dev; |
1578 | ||
1579 | dev->stats.rx_packets++; | |
1580 | dev->stats.rx_bytes += rx->skb->len; | |
1581 | ||
1582 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1583 | |
9ae54c84 | 1584 | return RX_QUEUED; |
571ecf67 JB |
1585 | } |
1586 | ||
49461622 | 1587 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1588 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1589 | { |
1590 | struct ieee80211_local *local = rx->local; | |
1591 | struct ieee80211_hw *hw = &local->hw; | |
1592 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1593 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1594 | struct tid_ampdu_rx *tid_agg_rx; |
1595 | u16 start_seq_num; | |
1596 | u16 tid; | |
1597 | ||
a7767f95 | 1598 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1599 | return RX_CONTINUE; |
71364716 | 1600 | |
a7767f95 | 1601 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1602 | if (!rx->sta) |
9ae54c84 | 1603 | return RX_CONTINUE; |
71364716 | 1604 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1605 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1606 | != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1607 | return RX_CONTINUE; |
cee24a3e | 1608 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1609 | |
1610 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1611 | ||
1612 | /* reset session timer */ | |
20ad19d0 JB |
1613 | if (tid_agg_rx->timeout) |
1614 | mod_timer(&tid_agg_rx->session_timer, | |
1615 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 RR |
1616 | |
1617 | /* manage reordering buffer according to requested */ | |
1618 | /* sequence number */ | |
1619 | rcu_read_lock(); | |
f1d58c25 | 1620 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, |
71364716 RR |
1621 | start_seq_num, 1); |
1622 | rcu_read_unlock(); | |
e4c26add | 1623 | return RX_DROP_UNUSABLE; |
71364716 RR |
1624 | } |
1625 | ||
9ae54c84 | 1626 | return RX_CONTINUE; |
71364716 RR |
1627 | } |
1628 | ||
f4f727a6 JM |
1629 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1630 | struct ieee80211_mgmt *mgmt, | |
1631 | size_t len) | |
fea14732 JM |
1632 | { |
1633 | struct ieee80211_local *local = sdata->local; | |
1634 | struct sk_buff *skb; | |
1635 | struct ieee80211_mgmt *resp; | |
1636 | ||
1637 | if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) { | |
1638 | /* Not to own unicast address */ | |
1639 | return; | |
1640 | } | |
1641 | ||
46900298 JB |
1642 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
1643 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 1644 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
1645 | return; |
1646 | } | |
1647 | ||
1648 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
1649 | /* Too short SA Query request frame */ | |
1650 | return; | |
1651 | } | |
1652 | ||
1653 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
1654 | if (skb == NULL) | |
1655 | return; | |
1656 | ||
1657 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1658 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
1659 | memset(resp, 0, 24); | |
1660 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
1661 | memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN); | |
46900298 | 1662 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
1663 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1664 | IEEE80211_STYPE_ACTION); | |
1665 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
1666 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
1667 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
1668 | memcpy(resp->u.action.u.sa_query.trans_id, | |
1669 | mgmt->u.action.u.sa_query.trans_id, | |
1670 | WLAN_SA_QUERY_TR_ID_LEN); | |
1671 | ||
1672 | ieee80211_tx_skb(sdata, skb, 1); | |
1673 | } | |
1674 | ||
de1ede7a JB |
1675 | static ieee80211_rx_result debug_noinline |
1676 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1677 | { | |
1678 | struct ieee80211_local *local = rx->local; | |
1679 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1680 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
1681 | int len = rx->skb->len; | |
1682 | ||
1683 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1684 | return RX_CONTINUE; | |
1685 | ||
1686 | if (!rx->sta) | |
1687 | return RX_DROP_MONITOR; | |
1688 | ||
1689 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) | |
1690 | return RX_DROP_MONITOR; | |
1691 | ||
97ebe12a JM |
1692 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1693 | return RX_DROP_MONITOR; | |
1694 | ||
de1ede7a JB |
1695 | /* all categories we currently handle have action_code */ |
1696 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1697 | return RX_DROP_MONITOR; | |
1698 | ||
de1ede7a JB |
1699 | switch (mgmt->u.action.category) { |
1700 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
1701 | /* |
1702 | * The aggregation code is not prepared to handle | |
1703 | * anything but STA/AP due to the BSSID handling; | |
1704 | * IBSS could work in the code but isn't supported | |
1705 | * by drivers or the standard. | |
1706 | */ | |
1707 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
1708 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
1709 | sdata->vif.type != NL80211_IFTYPE_AP) | |
1710 | return RX_DROP_MONITOR; | |
1711 | ||
de1ede7a JB |
1712 | switch (mgmt->u.action.u.addba_req.action_code) { |
1713 | case WLAN_ACTION_ADDBA_REQ: | |
1714 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1715 | sizeof(mgmt->u.action.u.addba_req))) | |
1716 | return RX_DROP_MONITOR; | |
1717 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
1718 | break; | |
1719 | case WLAN_ACTION_ADDBA_RESP: | |
1720 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1721 | sizeof(mgmt->u.action.u.addba_resp))) | |
1722 | return RX_DROP_MONITOR; | |
1723 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); | |
1724 | break; | |
1725 | case WLAN_ACTION_DELBA: | |
1726 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1727 | sizeof(mgmt->u.action.u.delba))) | |
1728 | return RX_DROP_MONITOR; | |
1729 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); | |
1730 | break; | |
1731 | } | |
39192c0b JB |
1732 | break; |
1733 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1734 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
1735 | return RX_DROP_MONITOR; | |
46900298 JB |
1736 | |
1737 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1738 | return RX_DROP_MONITOR; | |
1739 | ||
39192c0b JB |
1740 | switch (mgmt->u.action.u.measurement.action_code) { |
1741 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1742 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1743 | sizeof(mgmt->u.action.u.measurement))) | |
1744 | return RX_DROP_MONITOR; | |
1745 | ieee80211_process_measurement_req(sdata, mgmt, len); | |
1746 | break; | |
c481ec97 S |
1747 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
1748 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1749 | sizeof(mgmt->u.action.u.chan_switch))) | |
1750 | return RX_DROP_MONITOR; | |
1751 | ||
cc32abd4 JB |
1752 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
1753 | return RX_DROP_MONITOR; | |
1754 | ||
46900298 | 1755 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
c481ec97 S |
1756 | return RX_DROP_MONITOR; |
1757 | ||
77fdaa12 | 1758 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
39192c0b JB |
1759 | } |
1760 | break; | |
fea14732 JM |
1761 | case WLAN_CATEGORY_SA_QUERY: |
1762 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1763 | sizeof(mgmt->u.action.u.sa_query))) | |
1764 | return RX_DROP_MONITOR; | |
1765 | switch (mgmt->u.action.u.sa_query.action) { | |
1766 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
1767 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1768 | return RX_DROP_MONITOR; | |
1769 | ieee80211_process_sa_query_req(sdata, mgmt, len); | |
1770 | break; | |
1771 | case WLAN_ACTION_SA_QUERY_RESPONSE: | |
1772 | /* | |
1773 | * SA Query response is currently only used in AP mode | |
1774 | * and it is processed in user space. | |
1775 | */ | |
1776 | return RX_CONTINUE; | |
1777 | } | |
1778 | break; | |
39192c0b JB |
1779 | default: |
1780 | return RX_CONTINUE; | |
de1ede7a JB |
1781 | } |
1782 | ||
39192c0b JB |
1783 | rx->sta->rx_packets++; |
1784 | dev_kfree_skb(rx->skb); | |
1785 | return RX_QUEUED; | |
de1ede7a JB |
1786 | } |
1787 | ||
49461622 | 1788 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1789 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 1790 | { |
759ef3eb | 1791 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
97ebe12a | 1792 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
571ecf67 | 1793 | |
5cf121c3 | 1794 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1795 | return RX_DROP_MONITOR; |
571ecf67 | 1796 | |
97ebe12a JM |
1797 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1798 | return RX_DROP_MONITOR; | |
1799 | ||
472dbc45 | 1800 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
f1d58c25 | 1801 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb); |
472dbc45 | 1802 | |
3832c287 | 1803 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
f1d58c25 | 1804 | return ieee80211_ibss_rx_mgmt(sdata, rx->skb); |
f9d540ee | 1805 | |
7986cf95 | 1806 | if (sdata->vif.type == NL80211_IFTYPE_STATION) |
f1d58c25 | 1807 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
46900298 | 1808 | |
7986cf95 | 1809 | return RX_DROP_MONITOR; |
571ecf67 JB |
1810 | } |
1811 | ||
571ecf67 JB |
1812 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, |
1813 | struct ieee80211_hdr *hdr, | |
5cf121c3 | 1814 | struct ieee80211_rx_data *rx) |
571ecf67 | 1815 | { |
a7767f95 HH |
1816 | int keyidx; |
1817 | unsigned int hdrlen; | |
571ecf67 | 1818 | |
a7767f95 | 1819 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1820 | if (rx->skb->len >= hdrlen + 4) |
1821 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1822 | else | |
1823 | keyidx = -1; | |
1824 | ||
8944b79f | 1825 | if (!rx->sta) { |
aa0daf0e JB |
1826 | /* |
1827 | * Some hardware seem to generate incorrect Michael MIC | |
1828 | * reports; ignore them to avoid triggering countermeasures. | |
1829 | */ | |
571ecf67 JB |
1830 | goto ignore; |
1831 | } | |
1832 | ||
a7767f95 | 1833 | if (!ieee80211_has_protected(hdr->frame_control)) |
571ecf67 | 1834 | goto ignore; |
571ecf67 | 1835 | |
05c914fe | 1836 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
1837 | /* |
1838 | * APs with pairwise keys should never receive Michael MIC | |
1839 | * errors for non-zero keyidx because these are reserved for | |
1840 | * group keys and only the AP is sending real multicast | |
1841 | * frames in the BSS. | |
1842 | */ | |
eb063c17 | 1843 | goto ignore; |
571ecf67 JB |
1844 | } |
1845 | ||
a7767f95 HH |
1846 | if (!ieee80211_is_data(hdr->frame_control) && |
1847 | !ieee80211_is_auth(hdr->frame_control)) | |
571ecf67 | 1848 | goto ignore; |
571ecf67 | 1849 | |
e6d6e342 JB |
1850 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
1851 | GFP_ATOMIC); | |
571ecf67 JB |
1852 | ignore: |
1853 | dev_kfree_skb(rx->skb); | |
1854 | rx->skb = NULL; | |
1855 | } | |
1856 | ||
5cf121c3 JB |
1857 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
1858 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) | |
3d30d949 MW |
1859 | { |
1860 | struct ieee80211_sub_if_data *sdata; | |
1861 | struct ieee80211_local *local = rx->local; | |
1862 | struct ieee80211_rtap_hdr { | |
1863 | struct ieee80211_radiotap_header hdr; | |
1864 | u8 flags; | |
1865 | u8 rate; | |
1866 | __le16 chan_freq; | |
1867 | __le16 chan_flags; | |
1868 | } __attribute__ ((packed)) *rthdr; | |
1869 | struct sk_buff *skb = rx->skb, *skb2; | |
1870 | struct net_device *prev_dev = NULL; | |
5cf121c3 | 1871 | struct ieee80211_rx_status *status = rx->status; |
3d30d949 | 1872 | |
5cf121c3 | 1873 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1874 | goto out_free_skb; |
1875 | ||
1876 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1877 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1878 | goto out_free_skb; | |
1879 | ||
1880 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1881 | memset(rthdr, 0, sizeof(*rthdr)); | |
1882 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1883 | rthdr->hdr.it_present = | |
1884 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1885 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1886 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1887 | ||
5cf121c3 | 1888 | rthdr->rate = rx->rate->bitrate / 5; |
3d30d949 MW |
1889 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1890 | ||
1891 | if (status->band == IEEE80211_BAND_5GHZ) | |
1892 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1893 | IEEE80211_CHAN_5GHZ); | |
1894 | else | |
1895 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1896 | IEEE80211_CHAN_2GHZ); | |
1897 | ||
1898 | skb_set_mac_header(skb, 0); | |
1899 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1900 | skb->pkt_type = PACKET_OTHERHOST; | |
1901 | skb->protocol = htons(ETH_P_802_2); | |
1902 | ||
1903 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1904 | if (!netif_running(sdata->dev)) | |
1905 | continue; | |
1906 | ||
05c914fe | 1907 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
1908 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
1909 | continue; | |
1910 | ||
1911 | if (prev_dev) { | |
1912 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1913 | if (skb2) { | |
1914 | skb2->dev = prev_dev; | |
1915 | netif_rx(skb2); | |
1916 | } | |
1917 | } | |
1918 | ||
1919 | prev_dev = sdata->dev; | |
1920 | sdata->dev->stats.rx_packets++; | |
1921 | sdata->dev->stats.rx_bytes += skb->len; | |
1922 | } | |
1923 | ||
1924 | if (prev_dev) { | |
1925 | skb->dev = prev_dev; | |
1926 | netif_rx(skb); | |
1927 | skb = NULL; | |
1928 | } else | |
1929 | goto out_free_skb; | |
1930 | ||
5cf121c3 | 1931 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
1932 | return; |
1933 | ||
1934 | out_free_skb: | |
1935 | dev_kfree_skb(skb); | |
1936 | } | |
1937 | ||
571ecf67 | 1938 | |
8944b79f | 1939 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1940 | struct ieee80211_rx_data *rx, |
8944b79f | 1941 | struct sk_buff *skb) |
58905290 | 1942 | { |
58905290 JB |
1943 | ieee80211_rx_result res = RX_DROP_MONITOR; |
1944 | ||
8944b79f JB |
1945 | rx->skb = skb; |
1946 | rx->sdata = sdata; | |
1947 | rx->dev = sdata->dev; | |
1948 | ||
e32f85f7 LCC |
1949 | #define CALL_RXH(rxh) \ |
1950 | do { \ | |
1951 | res = rxh(rx); \ | |
1952 | if (res != RX_CONTINUE) \ | |
1953 | goto rxh_done; \ | |
1954 | } while (0); | |
49461622 JB |
1955 | |
1956 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
1957 | CALL_RXH(ieee80211_rx_h_check) | |
1958 | CALL_RXH(ieee80211_rx_h_decrypt) | |
572e0012 | 1959 | CALL_RXH(ieee80211_rx_h_check_more_data) |
49461622 JB |
1960 | CALL_RXH(ieee80211_rx_h_sta_process) |
1961 | CALL_RXH(ieee80211_rx_h_defragment) | |
1962 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
1963 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
1964 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
1965 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
1966 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 1967 | #ifdef CONFIG_MAC80211_MESH |
e32f85f7 LCC |
1968 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1969 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 1970 | #endif |
49461622 JB |
1971 | CALL_RXH(ieee80211_rx_h_data) |
1972 | CALL_RXH(ieee80211_rx_h_ctrl) | |
de1ede7a | 1973 | CALL_RXH(ieee80211_rx_h_action) |
49461622 JB |
1974 | CALL_RXH(ieee80211_rx_h_mgmt) |
1975 | ||
1976 | #undef CALL_RXH | |
1977 | ||
1978 | rxh_done: | |
58905290 JB |
1979 | switch (res) { |
1980 | case RX_DROP_MONITOR: | |
49461622 JB |
1981 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1982 | if (rx->sta) | |
1983 | rx->sta->rx_dropped++; | |
1984 | /* fall through */ | |
1985 | case RX_CONTINUE: | |
3d30d949 MW |
1986 | ieee80211_rx_cooked_monitor(rx); |
1987 | break; | |
58905290 | 1988 | case RX_DROP_UNUSABLE: |
49461622 JB |
1989 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1990 | if (rx->sta) | |
1991 | rx->sta->rx_dropped++; | |
58905290 JB |
1992 | dev_kfree_skb(rx->skb); |
1993 | break; | |
49461622 JB |
1994 | case RX_QUEUED: |
1995 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
1996 | break; | |
58905290 JB |
1997 | } |
1998 | } | |
1999 | ||
571ecf67 JB |
2000 | /* main receive path */ |
2001 | ||
23a24def | 2002 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
7ab17c45 | 2003 | struct ieee80211_rx_data *rx, |
23a24def JB |
2004 | struct ieee80211_hdr *hdr) |
2005 | { | |
7ab17c45 | 2006 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type); |
23a24def JB |
2007 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2008 | ||
51fb61e7 | 2009 | switch (sdata->vif.type) { |
05c914fe | 2010 | case NL80211_IFTYPE_STATION: |
23a24def JB |
2011 | if (!bssid) |
2012 | return 0; | |
77fdaa12 JB |
2013 | if (!multicast && |
2014 | compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) { | |
4150c572 | 2015 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2016 | return 0; |
5cf121c3 | 2017 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2018 | } |
2019 | break; | |
05c914fe | 2020 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2021 | if (!bssid) |
2022 | return 0; | |
a7767f95 | 2023 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2024 | return 1; |
87291c02 | 2025 | } |
46900298 | 2026 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
5cf121c3 | 2027 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2028 | return 0; |
5cf121c3 | 2029 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2030 | } else if (!multicast && |
2031 | compare_ether_addr(sdata->dev->dev_addr, | |
2032 | hdr->addr1) != 0) { | |
4150c572 | 2033 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2034 | return 0; |
5cf121c3 | 2035 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2036 | } else if (!rx->sta) { |
2037 | int rate_idx; | |
2038 | if (rx->status->flag & RX_FLAG_HT) | |
2039 | rate_idx = 0; /* TODO: HT rates */ | |
2040 | else | |
2041 | rate_idx = rx->status->rate_idx; | |
ab1f5c0b | 2042 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2, |
0fb8ca45 JM |
2043 | BIT(rate_idx)); |
2044 | } | |
23a24def | 2045 | break; |
05c914fe | 2046 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 JB |
2047 | if (!multicast && |
2048 | compare_ether_addr(sdata->dev->dev_addr, | |
2049 | hdr->addr1) != 0) { | |
2050 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2051 | return 0; | |
2052 | ||
5cf121c3 | 2053 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2054 | } |
2055 | break; | |
05c914fe JB |
2056 | case NL80211_IFTYPE_AP_VLAN: |
2057 | case NL80211_IFTYPE_AP: | |
23a24def JB |
2058 | if (!bssid) { |
2059 | if (compare_ether_addr(sdata->dev->dev_addr, | |
2060 | hdr->addr1)) | |
2061 | return 0; | |
2062 | } else if (!ieee80211_bssid_match(bssid, | |
2063 | sdata->dev->dev_addr)) { | |
5cf121c3 | 2064 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2065 | return 0; |
5cf121c3 | 2066 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2067 | } |
23a24def | 2068 | break; |
05c914fe | 2069 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2070 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2071 | return 0; |
2072 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2073 | return 0; | |
2074 | break; | |
05c914fe | 2075 | case NL80211_IFTYPE_MONITOR: |
fb1c1cd6 JB |
2076 | /* take everything */ |
2077 | break; | |
05c914fe JB |
2078 | case NL80211_IFTYPE_UNSPECIFIED: |
2079 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
2080 | /* should never get here */ |
2081 | WARN_ON(1); | |
2082 | break; | |
23a24def JB |
2083 | } |
2084 | ||
2085 | return 1; | |
2086 | } | |
2087 | ||
571ecf67 | 2088 | /* |
6368e4b1 RR |
2089 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2090 | * be called with rcu_read_lock protection. | |
571ecf67 | 2091 | */ |
71ebb4aa RR |
2092 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
2093 | struct sk_buff *skb, | |
8318d78a | 2094 | struct ieee80211_rate *rate) |
571ecf67 | 2095 | { |
f1d58c25 | 2096 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2097 | struct ieee80211_local *local = hw_to_local(hw); |
2098 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2099 | struct ieee80211_hdr *hdr; |
5cf121c3 | 2100 | struct ieee80211_rx_data rx; |
6368e4b1 | 2101 | int prepares; |
8e6f0032 JB |
2102 | struct ieee80211_sub_if_data *prev = NULL; |
2103 | struct sk_buff *skb_new; | |
571ecf67 | 2104 | |
358c8d9d | 2105 | hdr = (struct ieee80211_hdr *)skb->data; |
571ecf67 JB |
2106 | memset(&rx, 0, sizeof(rx)); |
2107 | rx.skb = skb; | |
2108 | rx.local = local; | |
2109 | ||
5cf121c3 | 2110 | rx.status = status; |
5cf121c3 | 2111 | rx.rate = rate; |
72abd81b | 2112 | |
358c8d9d | 2113 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
571ecf67 | 2114 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2115 | |
8944b79f JB |
2116 | rx.sta = sta_info_get(local, hdr->addr2); |
2117 | if (rx.sta) { | |
d0709a65 JB |
2118 | rx.sdata = rx.sta->sdata; |
2119 | rx.dev = rx.sta->sdata->dev; | |
b2e7771e | 2120 | } |
571ecf67 | 2121 | |
571ecf67 | 2122 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
8944b79f | 2123 | ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx); |
d0709a65 | 2124 | return; |
571ecf67 JB |
2125 | } |
2126 | ||
c2b13452 | 2127 | if (unlikely(local->sw_scanning || local->hw_scanning)) |
5cf121c3 | 2128 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2129 | |
38f3714d | 2130 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2131 | ieee80211_verify_alignment(&rx); |
38f3714d | 2132 | |
571ecf67 JB |
2133 | skb = rx.skb; |
2134 | ||
79010420 | 2135 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
2136 | if (!netif_running(sdata->dev)) |
2137 | continue; | |
2138 | ||
05c914fe | 2139 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
2140 | continue; |
2141 | ||
5cf121c3 | 2142 | rx.flags |= IEEE80211_RX_RA_MATCH; |
7ab17c45 | 2143 | prepares = prepare_for_handlers(sdata, &rx, hdr); |
23a24def | 2144 | |
6368e4b1 | 2145 | if (!prepares) |
23a24def | 2146 | continue; |
8e6f0032 | 2147 | |
340e11f3 JB |
2148 | /* |
2149 | * frame is destined for this interface, but if it's not | |
2150 | * also for the previous one we handle that after the | |
2151 | * loop to avoid copying the SKB once too much | |
2152 | */ | |
2153 | ||
2154 | if (!prev) { | |
2155 | prev = sdata; | |
2156 | continue; | |
8e6f0032 | 2157 | } |
340e11f3 JB |
2158 | |
2159 | /* | |
2160 | * frame was destined for the previous interface | |
2161 | * so invoke RX handlers for it | |
2162 | */ | |
2163 | ||
2164 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2165 | if (!skb_new) { | |
2166 | if (net_ratelimit()) | |
2167 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 2168 | "multicast frame for %s\n", |
dd1cd4c6 JB |
2169 | wiphy_name(local->hw.wiphy), |
2170 | prev->dev->name); | |
340e11f3 JB |
2171 | continue; |
2172 | } | |
8944b79f | 2173 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 2174 | prev = sdata; |
571ecf67 | 2175 | } |
a4b7d7bd | 2176 | if (prev) |
8944b79f | 2177 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
a4b7d7bd | 2178 | else |
8e6f0032 | 2179 | dev_kfree_skb(skb); |
571ecf67 | 2180 | } |
6368e4b1 | 2181 | |
b580781e RR |
2182 | #define SEQ_MODULO 0x1000 |
2183 | #define SEQ_MASK 0xfff | |
2184 | ||
2185 | static inline int seq_less(u16 sq1, u16 sq2) | |
2186 | { | |
c6a1fa12 | 2187 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); |
b580781e RR |
2188 | } |
2189 | ||
2190 | static inline u16 seq_inc(u16 sq) | |
2191 | { | |
c6a1fa12 | 2192 | return (sq + 1) & SEQ_MASK; |
b580781e RR |
2193 | } |
2194 | ||
2195 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
2196 | { | |
c6a1fa12 | 2197 | return (sq1 - sq2) & SEQ_MASK; |
b580781e RR |
2198 | } |
2199 | ||
2200 | ||
2d3babd1 JM |
2201 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, |
2202 | struct tid_ampdu_rx *tid_agg_rx, | |
2203 | int index) | |
2204 | { | |
2205 | struct ieee80211_supported_band *sband; | |
2206 | struct ieee80211_rate *rate; | |
f1d58c25 JB |
2207 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; |
2208 | struct ieee80211_rx_status *status; | |
2d3babd1 | 2209 | |
f1d58c25 | 2210 | if (!skb) |
2d3babd1 JM |
2211 | goto no_frame; |
2212 | ||
f1d58c25 JB |
2213 | status = IEEE80211_SKB_RXCB(skb); |
2214 | ||
2d3babd1 | 2215 | /* release the reordered frames to stack */ |
f1d58c25 JB |
2216 | sband = hw->wiphy->bands[status->band]; |
2217 | if (status->flag & RX_FLAG_HT) | |
2d3babd1 JM |
2218 | rate = sband->bitrates; /* TODO: HT rates */ |
2219 | else | |
f1d58c25 JB |
2220 | rate = &sband->bitrates[status->rate_idx]; |
2221 | __ieee80211_rx_handle_packet(hw, skb, rate); | |
2d3babd1 JM |
2222 | tid_agg_rx->stored_mpdu_num--; |
2223 | tid_agg_rx->reorder_buf[index] = NULL; | |
2224 | ||
2225 | no_frame: | |
2226 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2227 | } | |
2228 | ||
2229 | ||
4d050f1d JM |
2230 | /* |
2231 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
2232 | * the skb was added to the buffer longer than this time ago, the earlier | |
2233 | * frames that have not yet been received are assumed to be lost and the skb | |
2234 | * can be released for processing. This may also release other skb's from the | |
2235 | * reorder buffer if there are no additional gaps between the frames. | |
2236 | */ | |
2237 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
2238 | ||
71364716 RR |
2239 | /* |
2240 | * As it function blongs to Rx path it must be called with | |
2241 | * the proper rcu_read_lock protection for its flow. | |
2242 | */ | |
c6a1fa12 JB |
2243 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
2244 | struct tid_ampdu_rx *tid_agg_rx, | |
2245 | struct sk_buff *skb, | |
2246 | u16 mpdu_seq_num, | |
2247 | int bar_req) | |
b580781e | 2248 | { |
b580781e RR |
2249 | u16 head_seq_num, buf_size; |
2250 | int index; | |
b580781e RR |
2251 | |
2252 | buf_size = tid_agg_rx->buf_size; | |
2253 | head_seq_num = tid_agg_rx->head_seq_num; | |
2254 | ||
2255 | /* frame with out of date sequence number */ | |
2256 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
2257 | dev_kfree_skb(skb); | |
2258 | return 1; | |
2259 | } | |
2260 | ||
2261 | /* if frame sequence number exceeds our buffering window size or | |
2262 | * block Ack Request arrived - release stored frames */ | |
2263 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
2264 | /* new head to the ordering buffer */ | |
2265 | if (bar_req) | |
2266 | head_seq_num = mpdu_seq_num; | |
2267 | else | |
2268 | head_seq_num = | |
2269 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
2270 | /* release stored frames up to new head to stack */ | |
2271 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
2272 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2273 | tid_agg_rx->ssn) | |
2274 | % tid_agg_rx->buf_size; | |
2d3babd1 JM |
2275 | ieee80211_release_reorder_frame(hw, tid_agg_rx, |
2276 | index); | |
b580781e RR |
2277 | } |
2278 | if (bar_req) | |
2279 | return 1; | |
2280 | } | |
2281 | ||
2282 | /* now the new frame is always in the range of the reordering */ | |
2283 | /* buffer window */ | |
2284 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
2285 | % tid_agg_rx->buf_size; | |
2286 | /* check if we already stored this frame */ | |
2287 | if (tid_agg_rx->reorder_buf[index]) { | |
2288 | dev_kfree_skb(skb); | |
2289 | return 1; | |
2290 | } | |
2291 | ||
2292 | /* if arrived mpdu is in the right order and nothing else stored */ | |
2293 | /* release it immediately */ | |
2294 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
2295 | tid_agg_rx->stored_mpdu_num == 0) { | |
2296 | tid_agg_rx->head_seq_num = | |
2297 | seq_inc(tid_agg_rx->head_seq_num); | |
2298 | return 0; | |
2299 | } | |
2300 | ||
2301 | /* put the frame in the reordering buffer */ | |
2302 | tid_agg_rx->reorder_buf[index] = skb; | |
4d050f1d | 2303 | tid_agg_rx->reorder_time[index] = jiffies; |
b580781e RR |
2304 | tid_agg_rx->stored_mpdu_num++; |
2305 | /* release the buffer until next missing frame */ | |
2306 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
2307 | % tid_agg_rx->buf_size; | |
4d050f1d JM |
2308 | if (!tid_agg_rx->reorder_buf[index] && |
2309 | tid_agg_rx->stored_mpdu_num > 1) { | |
2310 | /* | |
2311 | * No buffers ready to be released, but check whether any | |
2312 | * frames in the reorder buffer have timed out. | |
2313 | */ | |
2314 | int j; | |
2315 | int skipped = 1; | |
2316 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
2317 | j = (j + 1) % tid_agg_rx->buf_size) { | |
2318 | if (tid_agg_rx->reorder_buf[j] == NULL) { | |
2319 | skipped++; | |
2320 | continue; | |
2321 | } | |
2322 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
2323 | HZ / 10)) | |
2324 | break; | |
2325 | ||
2326 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
2327 | if (net_ratelimit()) | |
2328 | printk(KERN_DEBUG "%s: release an RX reorder " | |
2329 | "frame due to timeout on earlier " | |
2330 | "frames\n", | |
2331 | wiphy_name(hw->wiphy)); | |
2332 | #endif | |
2333 | ieee80211_release_reorder_frame(hw, tid_agg_rx, j); | |
2334 | ||
2335 | /* | |
2336 | * Increment the head seq# also for the skipped slots. | |
2337 | */ | |
2338 | tid_agg_rx->head_seq_num = | |
2339 | (tid_agg_rx->head_seq_num + skipped) & | |
2340 | SEQ_MASK; | |
2341 | skipped = 0; | |
2342 | } | |
2343 | } else while (tid_agg_rx->reorder_buf[index]) { | |
2d3babd1 | 2344 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
b580781e RR |
2345 | index = seq_sub(tid_agg_rx->head_seq_num, |
2346 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2347 | } | |
2348 | return 1; | |
2349 | } | |
2350 | ||
71ebb4aa | 2351 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
f1d58c25 | 2352 | struct sk_buff *skb) |
b580781e RR |
2353 | { |
2354 | struct ieee80211_hw *hw = &local->hw; | |
2355 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2356 | struct sta_info *sta; | |
2357 | struct tid_ampdu_rx *tid_agg_rx; | |
87228f57 | 2358 | u16 sc; |
b580781e | 2359 | u16 mpdu_seq_num; |
182503ab | 2360 | u8 ret = 0; |
b580781e RR |
2361 | int tid; |
2362 | ||
2363 | sta = sta_info_get(local, hdr->addr2); | |
2364 | if (!sta) | |
2365 | return ret; | |
2366 | ||
b580781e RR |
2367 | /* filter the QoS data rx stream according to |
2368 | * STA/TID and check if this STA/TID is on aggregation */ | |
87228f57 | 2369 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
b580781e RR |
2370 | goto end_reorder; |
2371 | ||
238f74a2 | 2372 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
b580781e | 2373 | |
cee24a3e | 2374 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
b580781e RR |
2375 | goto end_reorder; |
2376 | ||
cee24a3e RR |
2377 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2378 | ||
2560b6e2 EG |
2379 | /* qos null data frames are excluded */ |
2380 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
b580781e RR |
2381 | goto end_reorder; |
2382 | ||
2383 | /* new un-ordered ampdu frame - process it */ | |
2384 | ||
2385 | /* reset session timer */ | |
20ad19d0 JB |
2386 | if (tid_agg_rx->timeout) |
2387 | mod_timer(&tid_agg_rx->session_timer, | |
2388 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
b580781e RR |
2389 | |
2390 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2391 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2392 | if (sc & IEEE80211_SCTL_FRAG) { | |
17741cdc | 2393 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
b580781e RR |
2394 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
2395 | ret = 1; | |
2396 | goto end_reorder; | |
2397 | } | |
2398 | ||
2399 | /* according to mpdu sequence number deal with reordering buffer */ | |
2400 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
f1d58c25 | 2401 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, |
b580781e | 2402 | mpdu_seq_num, 0); |
d0709a65 | 2403 | end_reorder: |
b580781e RR |
2404 | return ret; |
2405 | } | |
2406 | ||
6368e4b1 RR |
2407 | /* |
2408 | * This is the receive path handler. It is called by a low level driver when an | |
2409 | * 802.11 MPDU is received from the hardware. | |
2410 | */ | |
f1d58c25 | 2411 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
2412 | { |
2413 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2414 | struct ieee80211_rate *rate = NULL; |
2415 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 2416 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a JB |
2417 | |
2418 | if (status->band < 0 || | |
13d8fd2d | 2419 | status->band >= IEEE80211_NUM_BANDS) { |
8318d78a JB |
2420 | WARN_ON(1); |
2421 | return; | |
2422 | } | |
2423 | ||
2424 | sband = local->hw.wiphy->bands[status->band]; | |
0fb8ca45 | 2425 | if (!sband) { |
8318d78a JB |
2426 | WARN_ON(1); |
2427 | return; | |
2428 | } | |
2429 | ||
0fb8ca45 JM |
2430 | if (status->flag & RX_FLAG_HT) { |
2431 | /* rate_idx is MCS index */ | |
2432 | if (WARN_ON(status->rate_idx < 0 || | |
2433 | status->rate_idx >= 76)) | |
2434 | return; | |
2435 | /* HT rates are not in the table - use the highest legacy rate | |
2436 | * for now since other parts of mac80211 may not yet be fully | |
2437 | * MCS aware. */ | |
2438 | rate = &sband->bitrates[sband->n_bitrates - 1]; | |
2439 | } else { | |
2440 | if (WARN_ON(status->rate_idx < 0 || | |
2441 | status->rate_idx >= sband->n_bitrates)) | |
2442 | return; | |
2443 | rate = &sband->bitrates[status->rate_idx]; | |
2444 | } | |
6368e4b1 RR |
2445 | |
2446 | /* | |
2447 | * key references and virtual interfaces are protected using RCU | |
2448 | * and this requires that we are in a read-side RCU section during | |
2449 | * receive processing | |
2450 | */ | |
2451 | rcu_read_lock(); | |
2452 | ||
2453 | /* | |
2454 | * Frames with failed FCS/PLCP checksum are not returned, | |
2455 | * all other frames are returned without radiotap header | |
2456 | * if it was previously present. | |
2457 | * Also, frames with less than 16 bytes are dropped. | |
2458 | */ | |
f1d58c25 | 2459 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
2460 | if (!skb) { |
2461 | rcu_read_unlock(); | |
2462 | return; | |
2463 | } | |
2464 | ||
aec67952 JM |
2465 | /* |
2466 | * In theory, the block ack reordering should happen after duplicate | |
2467 | * removal (ieee80211_rx_h_check(), which is an RX handler). As such, | |
2468 | * the call to ieee80211_rx_reorder_ampdu() should really be moved to | |
2469 | * happen as a new RX handler between ieee80211_rx_h_check and | |
2470 | * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for | |
2471 | * the time being, the call can be here since RX reorder buf processing | |
2472 | * will implicitly skip duplicates. We could, in theory at least, | |
2473 | * process frames that ieee80211_rx_h_passive_scan would drop (e.g., | |
2474 | * frames from other than operational channel), but that should not | |
2475 | * happen in normal networks. | |
2476 | */ | |
f1d58c25 JB |
2477 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
2478 | __ieee80211_rx_handle_packet(hw, skb, rate); | |
6368e4b1 RR |
2479 | |
2480 | rcu_read_unlock(); | |
2481 | } | |
571ecf67 JB |
2482 | EXPORT_SYMBOL(__ieee80211_rx); |
2483 | ||
2484 | /* This is a version of the rx handler that can be called from hard irq | |
2485 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 2486 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
2487 | { |
2488 | struct ieee80211_local *local = hw_to_local(hw); | |
2489 | ||
2490 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2491 | ||
2492 | skb->dev = local->mdev; | |
571ecf67 JB |
2493 | skb->pkt_type = IEEE80211_RX_MSG; |
2494 | skb_queue_tail(&local->skb_queue, skb); | |
2495 | tasklet_schedule(&local->tasklet); | |
2496 | } | |
2497 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |