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Commit | Line | Data |
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571ecf67 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
5 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
ab46623e | 12 | #include <linux/jiffies.h> |
571ecf67 JB |
13 | #include <linux/kernel.h> |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/etherdevice.h> | |
d4e46a3d | 17 | #include <linux/rcupdate.h> |
571ecf67 JB |
18 | #include <net/mac80211.h> |
19 | #include <net/ieee80211_radiotap.h> | |
20 | ||
21 | #include "ieee80211_i.h" | |
22 | #include "ieee80211_led.h" | |
571ecf67 JB |
23 | #include "wep.h" |
24 | #include "wpa.h" | |
25 | #include "tkip.h" | |
26 | #include "wme.h" | |
27 | ||
71364716 RR |
28 | u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
29 | struct tid_ampdu_rx *tid_agg_rx, | |
30 | struct sk_buff *skb, u16 mpdu_seq_num, | |
31 | int bar_req); | |
b2e7771e JB |
32 | /* |
33 | * monitor mode reception | |
34 | * | |
35 | * This function cleans up the SKB, i.e. it removes all the stuff | |
36 | * only useful for monitoring. | |
37 | */ | |
38 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
39 | struct sk_buff *skb, | |
40 | int rtap_len) | |
41 | { | |
42 | skb_pull(skb, rtap_len); | |
43 | ||
44 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { | |
45 | if (likely(skb->len > FCS_LEN)) | |
46 | skb_trim(skb, skb->len - FCS_LEN); | |
47 | else { | |
48 | /* driver bug */ | |
49 | WARN_ON(1); | |
50 | dev_kfree_skb(skb); | |
51 | skb = NULL; | |
52 | } | |
53 | } | |
54 | ||
55 | return skb; | |
56 | } | |
57 | ||
58 | static inline int should_drop_frame(struct ieee80211_rx_status *status, | |
59 | struct sk_buff *skb, | |
60 | int present_fcs_len, | |
61 | int radiotap_len) | |
62 | { | |
63 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
64 | ||
65 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
66 | return 1; | |
67 | if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len)) | |
68 | return 1; | |
98f0b0a3 RR |
69 | if (((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FTYPE)) == |
70 | cpu_to_le16(IEEE80211_FTYPE_CTL)) && | |
71 | ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE)) != | |
71364716 RR |
72 | cpu_to_le16(IEEE80211_STYPE_PSPOLL)) && |
73 | ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE)) != | |
74 | cpu_to_le16(IEEE80211_STYPE_BACK_REQ))) | |
b2e7771e JB |
75 | return 1; |
76 | return 0; | |
77 | } | |
78 | ||
79 | /* | |
80 | * This function copies a received frame to all monitor interfaces and | |
81 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
82 | * radiotap header the driver might have added. | |
83 | */ | |
84 | static struct sk_buff * | |
85 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a JB |
86 | struct ieee80211_rx_status *status, |
87 | struct ieee80211_rate *rate) | |
b2e7771e JB |
88 | { |
89 | struct ieee80211_sub_if_data *sdata; | |
b2e7771e | 90 | int needed_headroom = 0; |
c49e5ea3 JB |
91 | struct ieee80211_radiotap_header *rthdr; |
92 | __le64 *rttsft = NULL; | |
93 | struct ieee80211_rtap_fixed_data { | |
b2e7771e JB |
94 | u8 flags; |
95 | u8 rate; | |
96 | __le16 chan_freq; | |
97 | __le16 chan_flags; | |
98 | u8 antsignal; | |
99 | u8 padding_for_rxflags; | |
100 | __le16 rx_flags; | |
c49e5ea3 | 101 | } __attribute__ ((packed)) *rtfixed; |
b2e7771e JB |
102 | struct sk_buff *skb, *skb2; |
103 | struct net_device *prev_dev = NULL; | |
104 | int present_fcs_len = 0; | |
105 | int rtap_len = 0; | |
106 | ||
107 | /* | |
108 | * First, we may need to make a copy of the skb because | |
109 | * (1) we need to modify it for radiotap (if not present), and | |
110 | * (2) the other RX handlers will modify the skb we got. | |
111 | * | |
112 | * We don't need to, of course, if we aren't going to return | |
113 | * the SKB because it has a bad FCS/PLCP checksum. | |
114 | */ | |
115 | if (status->flag & RX_FLAG_RADIOTAP) | |
116 | rtap_len = ieee80211_get_radiotap_len(origskb->data); | |
117 | else | |
c49e5ea3 JB |
118 | /* room for radiotap header, always present fields and TSFT */ |
119 | needed_headroom = sizeof(*rthdr) + sizeof(*rtfixed) + 8; | |
b2e7771e JB |
120 | |
121 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
122 | present_fcs_len = FCS_LEN; | |
123 | ||
124 | if (!local->monitors) { | |
125 | if (should_drop_frame(status, origskb, present_fcs_len, | |
126 | rtap_len)) { | |
127 | dev_kfree_skb(origskb); | |
128 | return NULL; | |
129 | } | |
130 | ||
131 | return remove_monitor_info(local, origskb, rtap_len); | |
132 | } | |
133 | ||
134 | if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) { | |
135 | /* only need to expand headroom if necessary */ | |
136 | skb = origskb; | |
137 | origskb = NULL; | |
138 | ||
139 | /* | |
140 | * This shouldn't trigger often because most devices have an | |
141 | * RX header they pull before we get here, and that should | |
142 | * be big enough for our radiotap information. We should | |
143 | * probably export the length to drivers so that we can have | |
144 | * them allocate enough headroom to start with. | |
145 | */ | |
146 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 147 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
148 | dev_kfree_skb(skb); |
149 | return NULL; | |
150 | } | |
151 | } else { | |
152 | /* | |
153 | * Need to make a copy and possibly remove radiotap header | |
154 | * and FCS from the original. | |
155 | */ | |
156 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
157 | ||
158 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
159 | ||
160 | if (!skb) | |
161 | return origskb; | |
162 | } | |
163 | ||
164 | /* if necessary, prepend radiotap information */ | |
165 | if (!(status->flag & RX_FLAG_RADIOTAP)) { | |
c49e5ea3 JB |
166 | rtfixed = (void *) skb_push(skb, sizeof(*rtfixed)); |
167 | rtap_len = sizeof(*rthdr) + sizeof(*rtfixed); | |
168 | if (status->flag & RX_FLAG_TSFT) { | |
169 | rttsft = (void *) skb_push(skb, sizeof(*rttsft)); | |
170 | rtap_len += 8; | |
171 | } | |
b2e7771e JB |
172 | rthdr = (void *) skb_push(skb, sizeof(*rthdr)); |
173 | memset(rthdr, 0, sizeof(*rthdr)); | |
c49e5ea3 JB |
174 | memset(rtfixed, 0, sizeof(*rtfixed)); |
175 | rthdr->it_present = | |
b2e7771e JB |
176 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | |
177 | (1 << IEEE80211_RADIOTAP_RATE) | | |
178 | (1 << IEEE80211_RADIOTAP_CHANNEL) | | |
179 | (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL) | | |
180 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
c49e5ea3 JB |
181 | rtfixed->flags = 0; |
182 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
183 | rtfixed->flags |= IEEE80211_RADIOTAP_F_FCS; | |
184 | ||
185 | if (rttsft) { | |
186 | *rttsft = cpu_to_le64(status->mactime); | |
187 | rthdr->it_present |= | |
188 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
189 | } | |
b2e7771e JB |
190 | |
191 | /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */ | |
c49e5ea3 | 192 | rtfixed->rx_flags = 0; |
b2e7771e JB |
193 | if (status->flag & |
194 | (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
c49e5ea3 | 195 | rtfixed->rx_flags |= |
b2e7771e JB |
196 | cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS); |
197 | ||
8318d78a | 198 | rtfixed->rate = rate->bitrate / 5; |
b2e7771e | 199 | |
c49e5ea3 | 200 | rtfixed->chan_freq = cpu_to_le16(status->freq); |
b2e7771e | 201 | |
8318d78a | 202 | if (status->band == IEEE80211_BAND_5GHZ) |
c49e5ea3 | 203 | rtfixed->chan_flags = |
b2e7771e JB |
204 | cpu_to_le16(IEEE80211_CHAN_OFDM | |
205 | IEEE80211_CHAN_5GHZ); | |
206 | else | |
c49e5ea3 | 207 | rtfixed->chan_flags = |
b2e7771e JB |
208 | cpu_to_le16(IEEE80211_CHAN_DYN | |
209 | IEEE80211_CHAN_2GHZ); | |
210 | ||
c49e5ea3 JB |
211 | rtfixed->antsignal = status->ssi; |
212 | rthdr->it_len = cpu_to_le16(rtap_len); | |
b2e7771e JB |
213 | } |
214 | ||
ce3edf6d | 215 | skb_reset_mac_header(skb); |
b2e7771e JB |
216 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
217 | skb->pkt_type = PACKET_OTHERHOST; | |
218 | skb->protocol = htons(ETH_P_802_2); | |
219 | ||
220 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
221 | if (!netif_running(sdata->dev)) | |
222 | continue; | |
223 | ||
51fb61e7 | 224 | if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR) |
b2e7771e JB |
225 | continue; |
226 | ||
3d30d949 MW |
227 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
228 | continue; | |
229 | ||
b2e7771e JB |
230 | if (prev_dev) { |
231 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
232 | if (skb2) { | |
233 | skb2->dev = prev_dev; | |
234 | netif_rx(skb2); | |
235 | } | |
236 | } | |
237 | ||
238 | prev_dev = sdata->dev; | |
239 | sdata->dev->stats.rx_packets++; | |
240 | sdata->dev->stats.rx_bytes += skb->len; | |
241 | } | |
242 | ||
243 | if (prev_dev) { | |
244 | skb->dev = prev_dev; | |
245 | netif_rx(skb); | |
246 | } else | |
247 | dev_kfree_skb(skb); | |
248 | ||
249 | return origskb; | |
250 | } | |
251 | ||
252 | ||
38f3714d | 253 | static void ieee80211_parse_qos(struct ieee80211_txrx_data *rx) |
6e0d114d JB |
254 | { |
255 | u8 *data = rx->skb->data; | |
256 | int tid; | |
257 | ||
258 | /* does the frame have a qos control field? */ | |
259 | if (WLAN_FC_IS_QOS_DATA(rx->fc)) { | |
260 | u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN; | |
261 | /* frame has qos control */ | |
262 | tid = qc[0] & QOS_CONTROL_TID_MASK; | |
fd4c7f2f | 263 | if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) |
64bd4b69 | 264 | rx->flags |= IEEE80211_TXRXD_RX_AMSDU; |
fd4c7f2f | 265 | else |
64bd4b69 | 266 | rx->flags &= ~IEEE80211_TXRXD_RX_AMSDU; |
6e0d114d JB |
267 | } else { |
268 | if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) { | |
269 | /* Separate TID for management frames */ | |
270 | tid = NUM_RX_DATA_QUEUES - 1; | |
271 | } else { | |
272 | /* no qos control present */ | |
273 | tid = 0; /* 802.1d - Best Effort */ | |
274 | } | |
275 | } | |
52865dfd | 276 | |
6e0d114d | 277 | I802_DEBUG_INC(rx->local->wme_rx_queue[tid]); |
52865dfd JB |
278 | /* only a debug counter, sta might not be assigned properly yet */ |
279 | if (rx->sta) | |
6e0d114d | 280 | I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]); |
6e0d114d JB |
281 | |
282 | rx->u.rx.queue = tid; | |
283 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. | |
284 | * For now, set skb->priority to 0 for other cases. */ | |
285 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 286 | } |
6e0d114d | 287 | |
38f3714d JB |
288 | static void ieee80211_verify_ip_alignment(struct ieee80211_txrx_data *rx) |
289 | { | |
290 | #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT | |
291 | int hdrlen; | |
292 | ||
293 | if (!WLAN_FC_DATA_PRESENT(rx->fc)) | |
294 | return; | |
295 | ||
296 | /* | |
297 | * Drivers are required to align the payload data in a way that | |
298 | * guarantees that the contained IP header is aligned to a four- | |
299 | * byte boundary. In the case of regular frames, this simply means | |
300 | * aligning the payload to a four-byte boundary (because either | |
301 | * the IP header is directly contained, or IV/RFC1042 headers that | |
302 | * have a length divisible by four are in front of it. | |
303 | * | |
304 | * With A-MSDU frames, however, the payload data address must | |
305 | * yield two modulo four because there are 14-byte 802.3 headers | |
306 | * within the A-MSDU frames that push the IP header further back | |
307 | * to a multiple of four again. Thankfully, the specs were sane | |
308 | * enough this time around to require padding each A-MSDU subframe | |
309 | * to a length that is a multiple of four. | |
310 | * | |
311 | * Padding like atheros hardware adds which is inbetween the 802.11 | |
312 | * header and the payload is not supported, the driver is required | |
313 | * to move the 802.11 header further back in that case. | |
314 | */ | |
315 | hdrlen = ieee80211_get_hdrlen(rx->fc); | |
316 | if (rx->flags & IEEE80211_TXRXD_RX_AMSDU) | |
317 | hdrlen += ETH_HLEN; | |
318 | WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3); | |
319 | #endif | |
6e0d114d JB |
320 | } |
321 | ||
6368e4b1 | 322 | |
71ebb4aa | 323 | static u32 ieee80211_rx_load_stats(struct ieee80211_local *local, |
8318d78a JB |
324 | struct sk_buff *skb, |
325 | struct ieee80211_rx_status *status, | |
326 | struct ieee80211_rate *rate) | |
571ecf67 | 327 | { |
571ecf67 JB |
328 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
329 | u32 load = 0, hdrtime; | |
571ecf67 JB |
330 | |
331 | /* Estimate total channel use caused by this frame */ | |
332 | ||
571ecf67 JB |
333 | /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values, |
334 | * 1 usec = 1/8 * (1080 / 10) = 13.5 */ | |
335 | ||
8318d78a JB |
336 | if (status->band == IEEE80211_BAND_5GHZ || |
337 | (status->band == IEEE80211_BAND_5GHZ && | |
338 | rate->flags & IEEE80211_RATE_ERP_G)) | |
571ecf67 JB |
339 | hdrtime = CHAN_UTIL_HDR_SHORT; |
340 | else | |
341 | hdrtime = CHAN_UTIL_HDR_LONG; | |
342 | ||
343 | load = hdrtime; | |
344 | if (!is_multicast_ether_addr(hdr->addr1)) | |
345 | load += hdrtime; | |
346 | ||
8318d78a JB |
347 | /* TODO: optimise again */ |
348 | load += skb->len * CHAN_UTIL_RATE_LCM / rate->bitrate; | |
571ecf67 JB |
349 | |
350 | /* Divide channel_use by 8 to avoid wrapping around the counter */ | |
351 | load >>= CHAN_UTIL_SHIFT; | |
571ecf67 | 352 | |
6368e4b1 | 353 | return load; |
571ecf67 JB |
354 | } |
355 | ||
571ecf67 JB |
356 | /* rx handlers */ |
357 | ||
9ae54c84 | 358 | static ieee80211_rx_result |
571ecf67 JB |
359 | ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx) |
360 | { | |
52865dfd JB |
361 | if (rx->sta) |
362 | rx->sta->channel_use_raw += rx->u.rx.load; | |
571ecf67 | 363 | rx->sdata->channel_use_raw += rx->u.rx.load; |
9ae54c84 | 364 | return RX_CONTINUE; |
571ecf67 JB |
365 | } |
366 | ||
9ae54c84 | 367 | static ieee80211_rx_result |
571ecf67 JB |
368 | ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx) |
369 | { | |
370 | struct ieee80211_local *local = rx->local; | |
371 | struct sk_buff *skb = rx->skb; | |
372 | ||
ece8eddd ZY |
373 | if (unlikely(local->sta_hw_scanning)) |
374 | return ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status); | |
375 | ||
376 | if (unlikely(local->sta_sw_scanning)) { | |
377 | /* drop all the other packets during a software scan anyway */ | |
378 | if (ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status) | |
9ae54c84 | 379 | != RX_QUEUED) |
ece8eddd | 380 | dev_kfree_skb(skb); |
9ae54c84 | 381 | return RX_QUEUED; |
571ecf67 JB |
382 | } |
383 | ||
badffb72 | 384 | if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) { |
571ecf67 JB |
385 | /* scanning finished during invoking of handlers */ |
386 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 387 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
388 | } |
389 | ||
9ae54c84 | 390 | return RX_CONTINUE; |
571ecf67 JB |
391 | } |
392 | ||
9ae54c84 | 393 | static ieee80211_rx_result |
571ecf67 JB |
394 | ieee80211_rx_h_check(struct ieee80211_txrx_data *rx) |
395 | { | |
396 | struct ieee80211_hdr *hdr; | |
571ecf67 JB |
397 | hdr = (struct ieee80211_hdr *) rx->skb->data; |
398 | ||
399 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
400 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
401 | if (unlikely(rx->fc & IEEE80211_FCTL_RETRY && | |
402 | rx->sta->last_seq_ctrl[rx->u.rx.queue] == | |
403 | hdr->seq_ctrl)) { | |
badffb72 | 404 | if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) { |
571ecf67 JB |
405 | rx->local->dot11FrameDuplicateCount++; |
406 | rx->sta->num_duplicates++; | |
407 | } | |
e4c26add | 408 | return RX_DROP_MONITOR; |
571ecf67 JB |
409 | } else |
410 | rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl; | |
411 | } | |
412 | ||
571ecf67 JB |
413 | if (unlikely(rx->skb->len < 16)) { |
414 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 415 | return RX_DROP_MONITOR; |
571ecf67 JB |
416 | } |
417 | ||
571ecf67 JB |
418 | /* Drop disallowed frame classes based on STA auth/assoc state; |
419 | * IEEE 802.11, Chap 5.5. | |
420 | * | |
421 | * 80211.o does filtering only based on association state, i.e., it | |
422 | * drops Class 3 frames from not associated stations. hostapd sends | |
423 | * deauth/disassoc frames when needed. In addition, hostapd is | |
424 | * responsible for filtering on both auth and assoc states. | |
425 | */ | |
426 | if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA || | |
427 | ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL && | |
428 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) && | |
51fb61e7 | 429 | rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS && |
571ecf67 JB |
430 | (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) { |
431 | if ((!(rx->fc & IEEE80211_FCTL_FROMDS) && | |
432 | !(rx->fc & IEEE80211_FCTL_TODS) && | |
433 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) | |
badffb72 | 434 | || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) { |
571ecf67 JB |
435 | /* Drop IBSS frames and frames for other hosts |
436 | * silently. */ | |
e4c26add | 437 | return RX_DROP_MONITOR; |
571ecf67 JB |
438 | } |
439 | ||
e4c26add | 440 | return RX_DROP_MONITOR; |
571ecf67 JB |
441 | } |
442 | ||
9ae54c84 | 443 | return RX_CONTINUE; |
570bd537 JB |
444 | } |
445 | ||
446 | ||
9ae54c84 | 447 | static ieee80211_rx_result |
1990af8d | 448 | ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx) |
570bd537 JB |
449 | { |
450 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
3017b80b JB |
451 | int keyidx; |
452 | int hdrlen; | |
e4c26add | 453 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 454 | struct ieee80211_key *stakey = NULL; |
570bd537 | 455 | |
3017b80b JB |
456 | /* |
457 | * Key selection 101 | |
458 | * | |
459 | * There are three types of keys: | |
460 | * - GTK (group keys) | |
461 | * - PTK (pairwise keys) | |
462 | * - STK (station-to-station pairwise keys) | |
463 | * | |
464 | * When selecting a key, we have to distinguish between multicast | |
465 | * (including broadcast) and unicast frames, the latter can only | |
466 | * use PTKs and STKs while the former always use GTKs. Unless, of | |
467 | * course, actual WEP keys ("pre-RSNA") are used, then unicast | |
468 | * frames can also use key indizes like GTKs. Hence, if we don't | |
469 | * have a PTK/STK we check the key index for a WEP key. | |
470 | * | |
8dc06a1c JB |
471 | * Note that in a regular BSS, multicast frames are sent by the |
472 | * AP only, associated stations unicast the frame to the AP first | |
473 | * which then multicasts it on their behalf. | |
474 | * | |
3017b80b JB |
475 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
476 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
477 | * The spec seems to expect that one negotiates the same key with |
478 | * every station but there's no such requirement; VLANs could be | |
479 | * possible. | |
3017b80b JB |
480 | */ |
481 | ||
482 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) | |
9ae54c84 | 483 | return RX_CONTINUE; |
571ecf67 | 484 | |
3017b80b | 485 | /* |
1990af8d | 486 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
487 | * addressed to us nor a multicast frame. |
488 | */ | |
badffb72 | 489 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
9ae54c84 | 490 | return RX_CONTINUE; |
3017b80b | 491 | |
d4e46a3d JB |
492 | if (rx->sta) |
493 | stakey = rcu_dereference(rx->sta->key); | |
494 | ||
495 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { | |
496 | rx->key = stakey; | |
571ecf67 | 497 | } else { |
3017b80b JB |
498 | /* |
499 | * The device doesn't give us the IV so we won't be | |
500 | * able to look up the key. That's ok though, we | |
501 | * don't need to decrypt the frame, we just won't | |
502 | * be able to keep statistics accurate. | |
503 | * Except for key threshold notifications, should | |
504 | * we somehow allow the driver to tell us which key | |
505 | * the hardware used if this flag is set? | |
506 | */ | |
7848ba7d JB |
507 | if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) && |
508 | (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 509 | return RX_CONTINUE; |
3017b80b JB |
510 | |
511 | hdrlen = ieee80211_get_hdrlen(rx->fc); | |
512 | ||
513 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 514 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
515 | |
516 | /* | |
517 | * no need to call ieee80211_wep_get_keyidx, | |
518 | * it verifies a bunch of things we've done already | |
519 | */ | |
520 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
521 | ||
d4e46a3d | 522 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
523 | |
524 | /* | |
525 | * RSNA-protected unicast frames should always be sent with | |
526 | * pairwise or station-to-station keys, but for WEP we allow | |
527 | * using a key index as well. | |
528 | */ | |
8f20fc24 | 529 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
530 | !is_multicast_ether_addr(hdr->addr1)) |
531 | rx->key = NULL; | |
571ecf67 JB |
532 | } |
533 | ||
3017b80b | 534 | if (rx->key) { |
571ecf67 | 535 | rx->key->tx_rx_count++; |
011bfcc4 | 536 | /* TODO: add threshold stuff again */ |
1990af8d | 537 | } else { |
7f3ad894 | 538 | #ifdef CONFIG_MAC80211_DEBUG |
70f08765 JB |
539 | if (net_ratelimit()) |
540 | printk(KERN_DEBUG "%s: RX protected frame," | |
541 | " but have no key\n", rx->dev->name); | |
7f3ad894 | 542 | #endif /* CONFIG_MAC80211_DEBUG */ |
e4c26add | 543 | return RX_DROP_MONITOR; |
70f08765 JB |
544 | } |
545 | ||
1990af8d JB |
546 | /* Check for weak IVs if possible */ |
547 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
548 | ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) && | |
549 | (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) || | |
550 | !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) && | |
551 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) | |
552 | rx->sta->wep_weak_iv_count++; | |
553 | ||
70f08765 JB |
554 | switch (rx->key->conf.alg) { |
555 | case ALG_WEP: | |
e2f036da MN |
556 | result = ieee80211_crypto_wep_decrypt(rx); |
557 | break; | |
70f08765 | 558 | case ALG_TKIP: |
e2f036da MN |
559 | result = ieee80211_crypto_tkip_decrypt(rx); |
560 | break; | |
70f08765 | 561 | case ALG_CCMP: |
e2f036da MN |
562 | result = ieee80211_crypto_ccmp_decrypt(rx); |
563 | break; | |
70f08765 JB |
564 | } |
565 | ||
e2f036da MN |
566 | /* either the frame has been decrypted or will be dropped */ |
567 | rx->u.rx.status->flag |= RX_FLAG_DECRYPTED; | |
568 | ||
569 | return result; | |
70f08765 JB |
570 | } |
571 | ||
571ecf67 JB |
572 | static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta) |
573 | { | |
574 | struct ieee80211_sub_if_data *sdata; | |
0795af57 JP |
575 | DECLARE_MAC_BUF(mac); |
576 | ||
571ecf67 JB |
577 | sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); |
578 | ||
579 | if (sdata->bss) | |
580 | atomic_inc(&sdata->bss->num_sta_ps); | |
581 | sta->flags |= WLAN_STA_PS; | |
4a9a66e9 | 582 | sta->flags &= ~WLAN_STA_PSPOLL; |
571ecf67 | 583 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0795af57 JP |
584 | printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n", |
585 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 JB |
586 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
587 | } | |
588 | ||
589 | static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta) | |
590 | { | |
591 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
592 | struct sk_buff *skb; | |
593 | int sent = 0; | |
594 | struct ieee80211_sub_if_data *sdata; | |
595 | struct ieee80211_tx_packet_data *pkt_data; | |
0795af57 | 596 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
597 | |
598 | sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); | |
004c872e | 599 | |
571ecf67 JB |
600 | if (sdata->bss) |
601 | atomic_dec(&sdata->bss->num_sta_ps); | |
004c872e | 602 | |
836341a7 | 603 | sta->flags &= ~(WLAN_STA_PS | WLAN_STA_PSPOLL); |
004c872e JB |
604 | |
605 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
606 | sta_info_clear_tim_bit(sta); | |
607 | ||
571ecf67 | 608 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0795af57 JP |
609 | printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n", |
610 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 | 611 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 612 | |
571ecf67 JB |
613 | /* Send all buffered frames to the station */ |
614 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
615 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; | |
616 | sent++; | |
e8bf9649 | 617 | pkt_data->flags |= IEEE80211_TXPD_REQUEUE; |
571ecf67 JB |
618 | dev_queue_xmit(skb); |
619 | } | |
620 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
621 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; | |
622 | local->total_ps_buffered--; | |
623 | sent++; | |
624 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 | 625 | printk(KERN_DEBUG "%s: STA %s aid %d send PS frame " |
571ecf67 | 626 | "since STA not sleeping anymore\n", dev->name, |
0795af57 | 627 | print_mac(mac, sta->addr), sta->aid); |
571ecf67 | 628 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
e8bf9649 | 629 | pkt_data->flags |= IEEE80211_TXPD_REQUEUE; |
571ecf67 JB |
630 | dev_queue_xmit(skb); |
631 | } | |
632 | ||
633 | return sent; | |
634 | } | |
635 | ||
9ae54c84 | 636 | static ieee80211_rx_result |
571ecf67 JB |
637 | ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx) |
638 | { | |
639 | struct sta_info *sta = rx->sta; | |
640 | struct net_device *dev = rx->dev; | |
641 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
642 | ||
643 | if (!sta) | |
9ae54c84 | 644 | return RX_CONTINUE; |
571ecf67 JB |
645 | |
646 | /* Update last_rx only for IBSS packets which are for the current | |
647 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
648 | * other STAs are using different BSSID. */ | |
51fb61e7 | 649 | if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) { |
71364716 RR |
650 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
651 | IEEE80211_IF_TYPE_IBSS); | |
571ecf67 JB |
652 | if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0) |
653 | sta->last_rx = jiffies; | |
654 | } else | |
655 | if (!is_multicast_ether_addr(hdr->addr1) || | |
51fb61e7 | 656 | rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) { |
571ecf67 JB |
657 | /* Update last_rx only for unicast frames in order to prevent |
658 | * the Probe Request frames (the only broadcast frames from a | |
659 | * STA in infrastructure mode) from keeping a connection alive. | |
660 | */ | |
661 | sta->last_rx = jiffies; | |
662 | } | |
663 | ||
badffb72 | 664 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
9ae54c84 | 665 | return RX_CONTINUE; |
571ecf67 JB |
666 | |
667 | sta->rx_fragments++; | |
668 | sta->rx_bytes += rx->skb->len; | |
6c55aa97 LF |
669 | sta->last_rssi = rx->u.rx.status->ssi; |
670 | sta->last_signal = rx->u.rx.status->signal; | |
671 | sta->last_noise = rx->u.rx.status->noise; | |
571ecf67 JB |
672 | |
673 | if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) { | |
674 | /* Change STA power saving mode only in the end of a frame | |
675 | * exchange sequence */ | |
676 | if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM)) | |
677 | rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta); | |
678 | else if (!(sta->flags & WLAN_STA_PS) && | |
679 | (rx->fc & IEEE80211_FCTL_PM)) | |
680 | ap_sta_ps_start(dev, sta); | |
681 | } | |
682 | ||
683 | /* Drop data::nullfunc frames silently, since they are used only to | |
684 | * control station power saving mode. */ | |
685 | if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
686 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) { | |
687 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); | |
688 | /* Update counter and free packet here to avoid counting this | |
689 | * as a dropped packed. */ | |
690 | sta->rx_packets++; | |
691 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 692 | return RX_QUEUED; |
571ecf67 JB |
693 | } |
694 | ||
9ae54c84 | 695 | return RX_CONTINUE; |
571ecf67 JB |
696 | } /* ieee80211_rx_h_sta_process */ |
697 | ||
571ecf67 JB |
698 | static inline struct ieee80211_fragment_entry * |
699 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
700 | unsigned int frag, unsigned int seq, int rx_queue, | |
701 | struct sk_buff **skb) | |
702 | { | |
703 | struct ieee80211_fragment_entry *entry; | |
704 | int idx; | |
705 | ||
706 | idx = sdata->fragment_next; | |
707 | entry = &sdata->fragments[sdata->fragment_next++]; | |
708 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
709 | sdata->fragment_next = 0; | |
710 | ||
711 | if (!skb_queue_empty(&entry->skb_list)) { | |
712 | #ifdef CONFIG_MAC80211_DEBUG | |
713 | struct ieee80211_hdr *hdr = | |
714 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
0795af57 JP |
715 | DECLARE_MAC_BUF(mac); |
716 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
717 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " |
718 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0795af57 | 719 | "addr1=%s addr2=%s\n", |
571ecf67 JB |
720 | sdata->dev->name, idx, |
721 | jiffies - entry->first_frag_time, entry->seq, | |
0795af57 JP |
722 | entry->last_frag, print_mac(mac, hdr->addr1), |
723 | print_mac(mac2, hdr->addr2)); | |
571ecf67 JB |
724 | #endif /* CONFIG_MAC80211_DEBUG */ |
725 | __skb_queue_purge(&entry->skb_list); | |
726 | } | |
727 | ||
728 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
729 | *skb = NULL; | |
730 | entry->first_frag_time = jiffies; | |
731 | entry->seq = seq; | |
732 | entry->rx_queue = rx_queue; | |
733 | entry->last_frag = frag; | |
734 | entry->ccmp = 0; | |
735 | entry->extra_len = 0; | |
736 | ||
737 | return entry; | |
738 | } | |
739 | ||
740 | static inline struct ieee80211_fragment_entry * | |
741 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
742 | u16 fc, unsigned int frag, unsigned int seq, | |
743 | int rx_queue, struct ieee80211_hdr *hdr) | |
744 | { | |
745 | struct ieee80211_fragment_entry *entry; | |
746 | int i, idx; | |
747 | ||
748 | idx = sdata->fragment_next; | |
749 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
750 | struct ieee80211_hdr *f_hdr; | |
751 | u16 f_fc; | |
752 | ||
753 | idx--; | |
754 | if (idx < 0) | |
755 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
756 | ||
757 | entry = &sdata->fragments[idx]; | |
758 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
759 | entry->rx_queue != rx_queue || | |
760 | entry->last_frag + 1 != frag) | |
761 | continue; | |
762 | ||
763 | f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data; | |
764 | f_fc = le16_to_cpu(f_hdr->frame_control); | |
765 | ||
766 | if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) || | |
767 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || | |
768 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
769 | continue; | |
770 | ||
ab46623e | 771 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
772 | __skb_queue_purge(&entry->skb_list); |
773 | continue; | |
774 | } | |
775 | return entry; | |
776 | } | |
777 | ||
778 | return NULL; | |
779 | } | |
780 | ||
9ae54c84 | 781 | static ieee80211_rx_result |
571ecf67 JB |
782 | ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx) |
783 | { | |
784 | struct ieee80211_hdr *hdr; | |
785 | u16 sc; | |
786 | unsigned int frag, seq; | |
787 | struct ieee80211_fragment_entry *entry; | |
788 | struct sk_buff *skb; | |
0795af57 | 789 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
790 | |
791 | hdr = (struct ieee80211_hdr *) rx->skb->data; | |
792 | sc = le16_to_cpu(hdr->seq_ctrl); | |
793 | frag = sc & IEEE80211_SCTL_FRAG; | |
794 | ||
795 | if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) || | |
796 | (rx->skb)->len < 24 || | |
797 | is_multicast_ether_addr(hdr->addr1))) { | |
798 | /* not fragmented */ | |
799 | goto out; | |
800 | } | |
801 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
802 | ||
803 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
804 | ||
805 | if (frag == 0) { | |
806 | /* This is the first fragment of a new frame. */ | |
807 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
808 | rx->u.rx.queue, &(rx->skb)); | |
8f20fc24 | 809 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
571ecf67 JB |
810 | (rx->fc & IEEE80211_FCTL_PROTECTED)) { |
811 | /* Store CCMP PN so that we can verify that the next | |
812 | * fragment has a sequential PN value. */ | |
813 | entry->ccmp = 1; | |
814 | memcpy(entry->last_pn, | |
815 | rx->key->u.ccmp.rx_pn[rx->u.rx.queue], | |
816 | CCMP_PN_LEN); | |
817 | } | |
9ae54c84 | 818 | return RX_QUEUED; |
571ecf67 JB |
819 | } |
820 | ||
821 | /* This is a fragment for a frame that should already be pending in | |
822 | * fragment cache. Add this fragment to the end of the pending entry. | |
823 | */ | |
824 | entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq, | |
825 | rx->u.rx.queue, hdr); | |
826 | if (!entry) { | |
827 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 828 | return RX_DROP_MONITOR; |
571ecf67 JB |
829 | } |
830 | ||
831 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
832 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
833 | if (entry->ccmp) { | |
834 | int i; | |
835 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 836 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 837 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
838 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
839 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
840 | pn[i]++; | |
841 | if (pn[i]) | |
842 | break; | |
843 | } | |
844 | rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue]; | |
845 | if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) { | |
1a84f3fd JB |
846 | if (net_ratelimit()) |
847 | printk(KERN_DEBUG "%s: defrag: CCMP PN not " | |
0795af57 | 848 | "sequential A2=%s" |
1a84f3fd JB |
849 | " PN=%02x%02x%02x%02x%02x%02x " |
850 | "(expected %02x%02x%02x%02x%02x%02x)\n", | |
0795af57 | 851 | rx->dev->name, print_mac(mac, hdr->addr2), |
1a84f3fd JB |
852 | rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], |
853 | rpn[5], pn[0], pn[1], pn[2], pn[3], | |
854 | pn[4], pn[5]); | |
e4c26add | 855 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
856 | } |
857 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); | |
858 | } | |
859 | ||
860 | skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc)); | |
861 | __skb_queue_tail(&entry->skb_list, rx->skb); | |
862 | entry->last_frag = frag; | |
863 | entry->extra_len += rx->skb->len; | |
864 | if (rx->fc & IEEE80211_FCTL_MOREFRAGS) { | |
865 | rx->skb = NULL; | |
9ae54c84 | 866 | return RX_QUEUED; |
571ecf67 JB |
867 | } |
868 | ||
869 | rx->skb = __skb_dequeue(&entry->skb_list); | |
870 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
871 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
872 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
873 | GFP_ATOMIC))) { | |
874 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
875 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 876 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
877 | } |
878 | } | |
879 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
880 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
881 | dev_kfree_skb(skb); | |
882 | } | |
883 | ||
884 | /* Complete frame has been reassembled - process it now */ | |
badffb72 | 885 | rx->flags |= IEEE80211_TXRXD_FRAGMENTED; |
571ecf67 JB |
886 | |
887 | out: | |
888 | if (rx->sta) | |
889 | rx->sta->rx_packets++; | |
890 | if (is_multicast_ether_addr(hdr->addr1)) | |
891 | rx->local->dot11MulticastReceivedFrameCount++; | |
892 | else | |
893 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 894 | return RX_CONTINUE; |
571ecf67 JB |
895 | } |
896 | ||
9ae54c84 | 897 | static ieee80211_rx_result |
571ecf67 JB |
898 | ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx) |
899 | { | |
98f0b0a3 | 900 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
901 | struct sk_buff *skb; |
902 | int no_pending_pkts; | |
0795af57 | 903 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
904 | |
905 | if (likely(!rx->sta || | |
906 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL || | |
907 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL || | |
badffb72 | 908 | !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))) |
9ae54c84 | 909 | return RX_CONTINUE; |
571ecf67 | 910 | |
51fb61e7 JB |
911 | if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) && |
912 | (sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) | |
e4c26add | 913 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 914 | |
571ecf67 JB |
915 | skb = skb_dequeue(&rx->sta->tx_filtered); |
916 | if (!skb) { | |
917 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
918 | if (skb) | |
919 | rx->local->total_ps_buffered--; | |
920 | } | |
921 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
922 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
923 | ||
924 | if (skb) { | |
925 | struct ieee80211_hdr *hdr = | |
926 | (struct ieee80211_hdr *) skb->data; | |
927 | ||
4a9a66e9 JB |
928 | /* |
929 | * Tell TX path to send one frame even though the STA may | |
930 | * still remain is PS mode after this frame exchange. | |
931 | */ | |
932 | rx->sta->flags |= WLAN_STA_PSPOLL; | |
571ecf67 JB |
933 | |
934 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
935 | printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n", |
936 | print_mac(mac, rx->sta->addr), rx->sta->aid, | |
571ecf67 JB |
937 | skb_queue_len(&rx->sta->ps_tx_buf)); |
938 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
939 | ||
940 | /* Use MoreData flag to indicate whether there are more | |
941 | * buffered frames for this STA */ | |
836341a7 | 942 | if (no_pending_pkts) |
571ecf67 | 943 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
836341a7 | 944 | else |
571ecf67 JB |
945 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
946 | ||
947 | dev_queue_xmit(skb); | |
948 | ||
004c872e JB |
949 | if (no_pending_pkts) |
950 | sta_info_clear_tim_bit(rx->sta); | |
571ecf67 JB |
951 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
952 | } else if (!rx->u.rx.sent_ps_buffered) { | |
004c872e JB |
953 | /* |
954 | * FIXME: This can be the result of a race condition between | |
955 | * us expiring a frame and the station polling for it. | |
956 | * Should we send it a null-func frame indicating we | |
957 | * have nothing buffered for it? | |
958 | */ | |
0795af57 | 959 | printk(KERN_DEBUG "%s: STA %s sent PS Poll even " |
571ecf67 | 960 | "though there is no buffered frames for it\n", |
0795af57 | 961 | rx->dev->name, print_mac(mac, rx->sta->addr)); |
571ecf67 | 962 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
963 | } |
964 | ||
9ae54c84 | 965 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
966 | * count as an dropped frame. */ |
967 | dev_kfree_skb(rx->skb); | |
968 | ||
9ae54c84 | 969 | return RX_QUEUED; |
571ecf67 JB |
970 | } |
971 | ||
9ae54c84 | 972 | static ieee80211_rx_result |
6e0d114d JB |
973 | ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx) |
974 | { | |
975 | u16 fc = rx->fc; | |
976 | u8 *data = rx->skb->data; | |
977 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data; | |
978 | ||
979 | if (!WLAN_FC_IS_QOS_DATA(fc)) | |
9ae54c84 | 980 | return RX_CONTINUE; |
6e0d114d JB |
981 | |
982 | /* remove the qos control field, update frame type and meta-data */ | |
983 | memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2); | |
984 | hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2); | |
985 | /* change frame type to non QOS */ | |
986 | rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA; | |
987 | hdr->frame_control = cpu_to_le16(fc); | |
988 | ||
9ae54c84 | 989 | return RX_CONTINUE; |
6e0d114d JB |
990 | } |
991 | ||
76ee65bf | 992 | static int |
ce3edf6d | 993 | ieee80211_802_1x_port_control(struct ieee80211_txrx_data *rx) |
571ecf67 | 994 | { |
238814fd | 995 | if (unlikely(!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED))) { |
571ecf67 | 996 | #ifdef CONFIG_MAC80211_DEBUG |
238814fd JB |
997 | if (net_ratelimit()) |
998 | printk(KERN_DEBUG "%s: dropped frame " | |
999 | "(unauthorized port)\n", rx->dev->name); | |
571ecf67 | 1000 | #endif /* CONFIG_MAC80211_DEBUG */ |
76ee65bf | 1001 | return -EACCES; |
571ecf67 JB |
1002 | } |
1003 | ||
76ee65bf | 1004 | return 0; |
571ecf67 JB |
1005 | } |
1006 | ||
76ee65bf | 1007 | static int |
ce3edf6d | 1008 | ieee80211_drop_unencrypted(struct ieee80211_txrx_data *rx) |
571ecf67 | 1009 | { |
3017b80b | 1010 | /* |
7848ba7d JB |
1011 | * Pass through unencrypted frames if the hardware has |
1012 | * decrypted them already. | |
3017b80b | 1013 | */ |
7848ba7d | 1014 | if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1015 | return 0; |
571ecf67 JB |
1016 | |
1017 | /* Drop unencrypted frames if key is set. */ | |
1018 | if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) && | |
1019 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
1020 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC && | |
ce3edf6d | 1021 | (rx->key || rx->sdata->drop_unencrypted))) { |
1a84f3fd JB |
1022 | if (net_ratelimit()) |
1023 | printk(KERN_DEBUG "%s: RX non-WEP frame, but expected " | |
1024 | "encryption\n", rx->dev->name); | |
76ee65bf | 1025 | return -EACCES; |
571ecf67 | 1026 | } |
76ee65bf | 1027 | return 0; |
571ecf67 JB |
1028 | } |
1029 | ||
76ee65bf RR |
1030 | static int |
1031 | ieee80211_data_to_8023(struct ieee80211_txrx_data *rx) | |
571ecf67 JB |
1032 | { |
1033 | struct net_device *dev = rx->dev; | |
571ecf67 JB |
1034 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; |
1035 | u16 fc, hdrlen, ethertype; | |
1036 | u8 *payload; | |
1037 | u8 dst[ETH_ALEN]; | |
1038 | u8 src[ETH_ALEN]; | |
76ee65bf | 1039 | struct sk_buff *skb = rx->skb; |
571ecf67 | 1040 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
0795af57 JP |
1041 | DECLARE_MAC_BUF(mac); |
1042 | DECLARE_MAC_BUF(mac2); | |
1043 | DECLARE_MAC_BUF(mac3); | |
1044 | DECLARE_MAC_BUF(mac4); | |
571ecf67 JB |
1045 | |
1046 | fc = rx->fc; | |
571ecf67 JB |
1047 | |
1048 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
76ee65bf | 1049 | return -1; |
571ecf67 JB |
1050 | |
1051 | hdrlen = ieee80211_get_hdrlen(fc); | |
1052 | ||
1053 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
1054 | * header | |
1055 | * IEEE 802.11 address fields: | |
1056 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
1057 | * 0 0 DA SA BSSID n/a | |
1058 | * 0 1 DA BSSID SA n/a | |
1059 | * 1 0 BSSID SA DA n/a | |
1060 | * 1 1 RA TA DA SA | |
1061 | */ | |
1062 | ||
1063 | switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
1064 | case IEEE80211_FCTL_TODS: | |
1065 | /* BSSID SA DA */ | |
1066 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1067 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1068 | ||
51fb61e7 JB |
1069 | if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP && |
1070 | sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) { | |
1a84f3fd JB |
1071 | if (net_ratelimit()) |
1072 | printk(KERN_DEBUG "%s: dropped ToDS frame " | |
0795af57 | 1073 | "(BSSID=%s SA=%s DA=%s)\n", |
1a84f3fd | 1074 | dev->name, |
0795af57 JP |
1075 | print_mac(mac, hdr->addr1), |
1076 | print_mac(mac2, hdr->addr2), | |
1077 | print_mac(mac3, hdr->addr3)); | |
76ee65bf | 1078 | return -1; |
571ecf67 JB |
1079 | } |
1080 | break; | |
1081 | case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
1082 | /* RA TA DA SA */ | |
1083 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1084 | memcpy(src, hdr->addr4, ETH_ALEN); | |
1085 | ||
51fb61e7 | 1086 | if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS)) { |
1a84f3fd JB |
1087 | if (net_ratelimit()) |
1088 | printk(KERN_DEBUG "%s: dropped FromDS&ToDS " | |
0795af57 | 1089 | "frame (RA=%s TA=%s DA=%s SA=%s)\n", |
1a84f3fd | 1090 | rx->dev->name, |
0795af57 JP |
1091 | print_mac(mac, hdr->addr1), |
1092 | print_mac(mac2, hdr->addr2), | |
1093 | print_mac(mac3, hdr->addr3), | |
1094 | print_mac(mac4, hdr->addr4)); | |
76ee65bf | 1095 | return -1; |
571ecf67 JB |
1096 | } |
1097 | break; | |
1098 | case IEEE80211_FCTL_FROMDS: | |
1099 | /* DA BSSID SA */ | |
1100 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1101 | memcpy(src, hdr->addr3, ETH_ALEN); | |
1102 | ||
51fb61e7 | 1103 | if (sdata->vif.type != IEEE80211_IF_TYPE_STA || |
b3316157 JL |
1104 | (is_multicast_ether_addr(dst) && |
1105 | !compare_ether_addr(src, dev->dev_addr))) | |
76ee65bf | 1106 | return -1; |
571ecf67 JB |
1107 | break; |
1108 | case 0: | |
1109 | /* DA SA BSSID */ | |
1110 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1111 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1112 | ||
51fb61e7 | 1113 | if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS) { |
571ecf67 | 1114 | if (net_ratelimit()) { |
0795af57 JP |
1115 | printk(KERN_DEBUG "%s: dropped IBSS frame " |
1116 | "(DA=%s SA=%s BSSID=%s)\n", | |
1117 | dev->name, | |
1118 | print_mac(mac, hdr->addr1), | |
1119 | print_mac(mac2, hdr->addr2), | |
1120 | print_mac(mac3, hdr->addr3)); | |
571ecf67 | 1121 | } |
76ee65bf | 1122 | return -1; |
571ecf67 JB |
1123 | } |
1124 | break; | |
1125 | } | |
1126 | ||
571ecf67 JB |
1127 | if (unlikely(skb->len - hdrlen < 8)) { |
1128 | if (net_ratelimit()) { | |
1129 | printk(KERN_DEBUG "%s: RX too short data frame " | |
1130 | "payload\n", dev->name); | |
1131 | } | |
76ee65bf | 1132 | return -1; |
571ecf67 JB |
1133 | } |
1134 | ||
76ee65bf | 1135 | payload = skb->data + hdrlen; |
571ecf67 JB |
1136 | ethertype = (payload[6] << 8) | payload[7]; |
1137 | ||
1138 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1139 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1140 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1141 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1142 | * replace EtherType */ | |
1143 | skb_pull(skb, hdrlen + 6); | |
1144 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1145 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1146 | } else { | |
1147 | struct ethhdr *ehdr; | |
1148 | __be16 len; | |
ce3edf6d | 1149 | |
571ecf67 JB |
1150 | skb_pull(skb, hdrlen); |
1151 | len = htons(skb->len); | |
1152 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1153 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1154 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1155 | ehdr->h_proto = len; | |
1156 | } | |
76ee65bf RR |
1157 | return 0; |
1158 | } | |
571ecf67 | 1159 | |
ce3edf6d JB |
1160 | /* |
1161 | * requires that rx->skb is a frame with ethernet header | |
1162 | */ | |
1163 | static bool ieee80211_frame_allowed(struct ieee80211_txrx_data *rx) | |
1164 | { | |
1165 | static const u8 pae_group_addr[ETH_ALEN] | |
1166 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; | |
1167 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1168 | ||
1169 | /* | |
1170 | * Allow EAPOL frames to us/the PAE group address regardless | |
1171 | * of whether the frame was encrypted or not. | |
1172 | */ | |
1173 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1174 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1175 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1176 | return true; | |
1177 | ||
1178 | if (ieee80211_802_1x_port_control(rx) || | |
1179 | ieee80211_drop_unencrypted(rx)) | |
1180 | return false; | |
1181 | ||
1182 | return true; | |
1183 | } | |
1184 | ||
1185 | /* | |
1186 | * requires that rx->skb is a frame with ethernet header | |
1187 | */ | |
76ee65bf RR |
1188 | static void |
1189 | ieee80211_deliver_skb(struct ieee80211_txrx_data *rx) | |
1190 | { | |
1191 | struct net_device *dev = rx->dev; | |
1192 | struct ieee80211_local *local = rx->local; | |
1193 | struct sk_buff *skb, *xmit_skb; | |
1194 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1195 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1196 | struct sta_info *dsta; | |
571ecf67 | 1197 | |
76ee65bf RR |
1198 | skb = rx->skb; |
1199 | xmit_skb = NULL; | |
571ecf67 | 1200 | |
51fb61e7 JB |
1201 | if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP || |
1202 | sdata->vif.type == IEEE80211_IF_TYPE_VLAN) && | |
badffb72 | 1203 | (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) { |
ce3edf6d JB |
1204 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1205 | /* | |
1206 | * send multicast frames both to higher layers in | |
1207 | * local net stack and back to the wireless medium | |
1208 | */ | |
76ee65bf RR |
1209 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1210 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1211 | printk(KERN_DEBUG "%s: failed to clone " |
1212 | "multicast frame\n", dev->name); | |
1213 | } else { | |
571ecf67 | 1214 | dsta = sta_info_get(local, skb->data); |
ce3edf6d JB |
1215 | if (dsta && dsta->dev == dev) { |
1216 | /* | |
1217 | * The destination station is associated to | |
1218 | * this AP (in this VLAN), so send the frame | |
1219 | * directly to it and do not pass it to local | |
1220 | * net stack. | |
571ecf67 | 1221 | */ |
76ee65bf | 1222 | xmit_skb = skb; |
571ecf67 JB |
1223 | skb = NULL; |
1224 | } | |
1225 | if (dsta) | |
1226 | sta_info_put(dsta); | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | if (skb) { | |
1231 | /* deliver to local stack */ | |
1232 | skb->protocol = eth_type_trans(skb, dev); | |
1233 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1234 | netif_rx(skb); | |
1235 | } | |
1236 | ||
76ee65bf | 1237 | if (xmit_skb) { |
571ecf67 | 1238 | /* send to wireless media */ |
f831e909 | 1239 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1240 | skb_reset_network_header(xmit_skb); |
1241 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1242 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1243 | } |
76ee65bf RR |
1244 | } |
1245 | ||
9ae54c84 | 1246 | static ieee80211_rx_result |
fd4c7f2f RR |
1247 | ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx) |
1248 | { | |
1249 | struct net_device *dev = rx->dev; | |
1250 | struct ieee80211_local *local = rx->local; | |
1251 | u16 fc, ethertype; | |
1252 | u8 *payload; | |
1253 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
1254 | const struct ethhdr *eth; | |
1255 | int remaining, err; | |
1256 | u8 dst[ETH_ALEN]; | |
1257 | u8 src[ETH_ALEN]; | |
1258 | DECLARE_MAC_BUF(mac); | |
1259 | ||
1260 | fc = rx->fc; | |
1261 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
9ae54c84 | 1262 | return RX_CONTINUE; |
fd4c7f2f RR |
1263 | |
1264 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
e4c26add | 1265 | return RX_DROP_MONITOR; |
fd4c7f2f | 1266 | |
64bd4b69 | 1267 | if (!(rx->flags & IEEE80211_TXRXD_RX_AMSDU)) |
9ae54c84 | 1268 | return RX_CONTINUE; |
fd4c7f2f RR |
1269 | |
1270 | err = ieee80211_data_to_8023(rx); | |
1271 | if (unlikely(err)) | |
e4c26add | 1272 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1273 | |
1274 | skb->dev = dev; | |
1275 | ||
1276 | dev->stats.rx_packets++; | |
1277 | dev->stats.rx_bytes += skb->len; | |
1278 | ||
1279 | /* skip the wrapping header */ | |
1280 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1281 | if (!eth) | |
e4c26add | 1282 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1283 | |
1284 | while (skb != frame) { | |
1285 | u8 padding; | |
1286 | __be16 len = eth->h_proto; | |
1287 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1288 | ||
1289 | remaining = skb->len; | |
1290 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1291 | memcpy(src, eth->h_source, ETH_ALEN); | |
1292 | ||
1293 | padding = ((4 - subframe_len) & 0x3); | |
1294 | /* the last MSDU has no padding */ | |
1295 | if (subframe_len > remaining) { | |
1296 | printk(KERN_DEBUG "%s: wrong buffer size", dev->name); | |
e4c26add | 1297 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1298 | } |
1299 | ||
1300 | skb_pull(skb, sizeof(struct ethhdr)); | |
1301 | /* if last subframe reuse skb */ | |
1302 | if (remaining <= subframe_len + padding) | |
1303 | frame = skb; | |
1304 | else { | |
1305 | frame = dev_alloc_skb(local->hw.extra_tx_headroom + | |
1306 | subframe_len); | |
1307 | ||
1308 | if (frame == NULL) | |
e4c26add | 1309 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1310 | |
1311 | skb_reserve(frame, local->hw.extra_tx_headroom + | |
1312 | sizeof(struct ethhdr)); | |
1313 | memcpy(skb_put(frame, ntohs(len)), skb->data, | |
1314 | ntohs(len)); | |
1315 | ||
1316 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1317 | padding); | |
1318 | if (!eth) { | |
1319 | printk(KERN_DEBUG "%s: wrong buffer size ", | |
1320 | dev->name); | |
1321 | dev_kfree_skb(frame); | |
e4c26add | 1322 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1323 | } |
1324 | } | |
1325 | ||
ce3edf6d | 1326 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1327 | frame->dev = dev; |
1328 | frame->priority = skb->priority; | |
1329 | rx->skb = frame; | |
1330 | ||
fd4c7f2f RR |
1331 | payload = frame->data; |
1332 | ethertype = (payload[6] << 8) | payload[7]; | |
1333 | ||
1334 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1335 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1336 | compare_ether_addr(payload, | |
1337 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1338 | /* remove RFC1042 or Bridge-Tunnel |
1339 | * encapsulation and replace EtherType */ | |
1340 | skb_pull(frame, 6); | |
1341 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1342 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1343 | } else { | |
ce3edf6d JB |
1344 | memcpy(skb_push(frame, sizeof(__be16)), |
1345 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1346 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1347 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1348 | } | |
1349 | ||
ce3edf6d JB |
1350 | if (!ieee80211_frame_allowed(rx)) { |
1351 | if (skb == frame) /* last frame */ | |
e4c26add | 1352 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1353 | dev_kfree_skb(frame); |
1354 | continue; | |
1355 | } | |
fd4c7f2f RR |
1356 | |
1357 | ieee80211_deliver_skb(rx); | |
1358 | } | |
1359 | ||
9ae54c84 | 1360 | return RX_QUEUED; |
fd4c7f2f RR |
1361 | } |
1362 | ||
9ae54c84 | 1363 | static ieee80211_rx_result |
76ee65bf RR |
1364 | ieee80211_rx_h_data(struct ieee80211_txrx_data *rx) |
1365 | { | |
1366 | struct net_device *dev = rx->dev; | |
1367 | u16 fc; | |
ce3edf6d | 1368 | int err; |
76ee65bf RR |
1369 | |
1370 | fc = rx->fc; | |
1371 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
9ae54c84 | 1372 | return RX_CONTINUE; |
76ee65bf RR |
1373 | |
1374 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
e4c26add | 1375 | return RX_DROP_MONITOR; |
76ee65bf | 1376 | |
76ee65bf RR |
1377 | err = ieee80211_data_to_8023(rx); |
1378 | if (unlikely(err)) | |
e4c26add | 1379 | return RX_DROP_UNUSABLE; |
76ee65bf | 1380 | |
ce3edf6d | 1381 | if (!ieee80211_frame_allowed(rx)) |
e4c26add | 1382 | return RX_DROP_MONITOR; |
ce3edf6d | 1383 | |
76ee65bf RR |
1384 | rx->skb->dev = dev; |
1385 | ||
1386 | dev->stats.rx_packets++; | |
1387 | dev->stats.rx_bytes += rx->skb->len; | |
1388 | ||
1389 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1390 | |
9ae54c84 | 1391 | return RX_QUEUED; |
571ecf67 JB |
1392 | } |
1393 | ||
9ae54c84 | 1394 | static ieee80211_rx_result |
71364716 RR |
1395 | ieee80211_rx_h_ctrl(struct ieee80211_txrx_data *rx) |
1396 | { | |
1397 | struct ieee80211_local *local = rx->local; | |
1398 | struct ieee80211_hw *hw = &local->hw; | |
1399 | struct sk_buff *skb = rx->skb; | |
1400 | struct ieee80211_bar *bar = (struct ieee80211_bar *) skb->data; | |
1401 | struct tid_ampdu_rx *tid_agg_rx; | |
1402 | u16 start_seq_num; | |
1403 | u16 tid; | |
1404 | ||
1405 | if (likely((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL)) | |
9ae54c84 | 1406 | return RX_CONTINUE; |
71364716 RR |
1407 | |
1408 | if ((rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BACK_REQ) { | |
1409 | if (!rx->sta) | |
9ae54c84 | 1410 | return RX_CONTINUE; |
71364716 RR |
1411 | tid = le16_to_cpu(bar->control) >> 12; |
1412 | tid_agg_rx = &(rx->sta->ampdu_mlme.tid_rx[tid]); | |
1413 | if (tid_agg_rx->state != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1414 | return RX_CONTINUE; |
71364716 RR |
1415 | |
1416 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1417 | ||
1418 | /* reset session timer */ | |
1419 | if (tid_agg_rx->timeout) { | |
1420 | unsigned long expires = | |
1421 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
1422 | mod_timer(&tid_agg_rx->session_timer, expires); | |
1423 | } | |
1424 | ||
1425 | /* manage reordering buffer according to requested */ | |
1426 | /* sequence number */ | |
1427 | rcu_read_lock(); | |
1428 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, | |
1429 | start_seq_num, 1); | |
1430 | rcu_read_unlock(); | |
e4c26add | 1431 | return RX_DROP_UNUSABLE; |
71364716 RR |
1432 | } |
1433 | ||
9ae54c84 | 1434 | return RX_CONTINUE; |
71364716 RR |
1435 | } |
1436 | ||
9ae54c84 | 1437 | static ieee80211_rx_result |
571ecf67 JB |
1438 | ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx) |
1439 | { | |
1440 | struct ieee80211_sub_if_data *sdata; | |
1441 | ||
badffb72 | 1442 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
e4c26add | 1443 | return RX_DROP_MONITOR; |
571ecf67 JB |
1444 | |
1445 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
51fb61e7 JB |
1446 | if ((sdata->vif.type == IEEE80211_IF_TYPE_STA || |
1447 | sdata->vif.type == IEEE80211_IF_TYPE_IBSS) && | |
ddd3d2be | 1448 | !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)) |
571ecf67 | 1449 | ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status); |
f9d540ee | 1450 | else |
e4c26add | 1451 | return RX_DROP_MONITOR; |
f9d540ee | 1452 | |
9ae54c84 | 1453 | return RX_QUEUED; |
571ecf67 JB |
1454 | } |
1455 | ||
571ecf67 JB |
1456 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, |
1457 | struct ieee80211_hdr *hdr, | |
571ecf67 JB |
1458 | struct ieee80211_txrx_data *rx) |
1459 | { | |
1460 | int keyidx, hdrlen; | |
0795af57 JP |
1461 | DECLARE_MAC_BUF(mac); |
1462 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
1463 | |
1464 | hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb); | |
1465 | if (rx->skb->len >= hdrlen + 4) | |
1466 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1467 | else | |
1468 | keyidx = -1; | |
1469 | ||
1a84f3fd JB |
1470 | if (net_ratelimit()) |
1471 | printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC " | |
0795af57 JP |
1472 | "failure from %s to %s keyidx=%d\n", |
1473 | dev->name, print_mac(mac, hdr->addr2), | |
1474 | print_mac(mac2, hdr->addr1), keyidx); | |
571ecf67 | 1475 | |
8944b79f | 1476 | if (!rx->sta) { |
aa0daf0e JB |
1477 | /* |
1478 | * Some hardware seem to generate incorrect Michael MIC | |
1479 | * reports; ignore them to avoid triggering countermeasures. | |
1480 | */ | |
1a84f3fd JB |
1481 | if (net_ratelimit()) |
1482 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
0795af57 JP |
1483 | "error for unknown address %s\n", |
1484 | dev->name, print_mac(mac, hdr->addr2)); | |
571ecf67 JB |
1485 | goto ignore; |
1486 | } | |
1487 | ||
1488 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) { | |
1a84f3fd JB |
1489 | if (net_ratelimit()) |
1490 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
aa0daf0e | 1491 | "error for a frame with no PROTECTED flag (src " |
0795af57 | 1492 | "%s)\n", dev->name, print_mac(mac, hdr->addr2)); |
571ecf67 JB |
1493 | goto ignore; |
1494 | } | |
1495 | ||
51fb61e7 | 1496 | if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) { |
aa0daf0e JB |
1497 | /* |
1498 | * APs with pairwise keys should never receive Michael MIC | |
1499 | * errors for non-zero keyidx because these are reserved for | |
1500 | * group keys and only the AP is sending real multicast | |
1501 | * frames in the BSS. | |
1502 | */ | |
eb063c17 JB |
1503 | if (net_ratelimit()) |
1504 | printk(KERN_DEBUG "%s: ignored Michael MIC error for " | |
1505 | "a frame with non-zero keyidx (%d)" | |
0795af57 JP |
1506 | " (src %s)\n", dev->name, keyidx, |
1507 | print_mac(mac, hdr->addr2)); | |
eb063c17 | 1508 | goto ignore; |
571ecf67 JB |
1509 | } |
1510 | ||
1511 | if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA && | |
1512 | ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || | |
1513 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) { | |
1a84f3fd JB |
1514 | if (net_ratelimit()) |
1515 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
1516 | "error for a frame that cannot be encrypted " | |
0795af57 JP |
1517 | "(fc=0x%04x) (src %s)\n", |
1518 | dev->name, rx->fc, print_mac(mac, hdr->addr2)); | |
571ecf67 JB |
1519 | goto ignore; |
1520 | } | |
1521 | ||
eb063c17 | 1522 | mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr); |
571ecf67 JB |
1523 | ignore: |
1524 | dev_kfree_skb(rx->skb); | |
1525 | rx->skb = NULL; | |
1526 | } | |
1527 | ||
3d30d949 MW |
1528 | static void ieee80211_rx_cooked_monitor(struct ieee80211_txrx_data *rx) |
1529 | { | |
1530 | struct ieee80211_sub_if_data *sdata; | |
1531 | struct ieee80211_local *local = rx->local; | |
1532 | struct ieee80211_rtap_hdr { | |
1533 | struct ieee80211_radiotap_header hdr; | |
1534 | u8 flags; | |
1535 | u8 rate; | |
1536 | __le16 chan_freq; | |
1537 | __le16 chan_flags; | |
1538 | } __attribute__ ((packed)) *rthdr; | |
1539 | struct sk_buff *skb = rx->skb, *skb2; | |
1540 | struct net_device *prev_dev = NULL; | |
1541 | struct ieee80211_rx_status *status = rx->u.rx.status; | |
1542 | ||
1543 | if (rx->flags & IEEE80211_TXRXD_RX_CMNTR_REPORTED) | |
1544 | goto out_free_skb; | |
1545 | ||
1546 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1547 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1548 | goto out_free_skb; | |
1549 | ||
1550 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1551 | memset(rthdr, 0, sizeof(*rthdr)); | |
1552 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1553 | rthdr->hdr.it_present = | |
1554 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1555 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1556 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1557 | ||
1558 | rthdr->rate = rx->u.rx.rate->bitrate / 5; | |
1559 | rthdr->chan_freq = cpu_to_le16(status->freq); | |
1560 | ||
1561 | if (status->band == IEEE80211_BAND_5GHZ) | |
1562 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1563 | IEEE80211_CHAN_5GHZ); | |
1564 | else | |
1565 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1566 | IEEE80211_CHAN_2GHZ); | |
1567 | ||
1568 | skb_set_mac_header(skb, 0); | |
1569 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1570 | skb->pkt_type = PACKET_OTHERHOST; | |
1571 | skb->protocol = htons(ETH_P_802_2); | |
1572 | ||
1573 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1574 | if (!netif_running(sdata->dev)) | |
1575 | continue; | |
1576 | ||
1577 | if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR || | |
1578 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) | |
1579 | continue; | |
1580 | ||
1581 | if (prev_dev) { | |
1582 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1583 | if (skb2) { | |
1584 | skb2->dev = prev_dev; | |
1585 | netif_rx(skb2); | |
1586 | } | |
1587 | } | |
1588 | ||
1589 | prev_dev = sdata->dev; | |
1590 | sdata->dev->stats.rx_packets++; | |
1591 | sdata->dev->stats.rx_bytes += skb->len; | |
1592 | } | |
1593 | ||
1594 | if (prev_dev) { | |
1595 | skb->dev = prev_dev; | |
1596 | netif_rx(skb); | |
1597 | skb = NULL; | |
1598 | } else | |
1599 | goto out_free_skb; | |
1600 | ||
1601 | rx->flags |= IEEE80211_TXRXD_RX_CMNTR_REPORTED; | |
1602 | return; | |
1603 | ||
1604 | out_free_skb: | |
1605 | dev_kfree_skb(skb); | |
1606 | } | |
1607 | ||
58905290 JB |
1608 | typedef ieee80211_rx_result (*ieee80211_rx_handler)(struct ieee80211_txrx_data *); |
1609 | static ieee80211_rx_handler ieee80211_rx_handlers[] = | |
571ecf67 JB |
1610 | { |
1611 | ieee80211_rx_h_if_stats, | |
571ecf67 JB |
1612 | ieee80211_rx_h_passive_scan, |
1613 | ieee80211_rx_h_check, | |
4f0d18e2 | 1614 | ieee80211_rx_h_decrypt, |
70f08765 | 1615 | ieee80211_rx_h_sta_process, |
571ecf67 JB |
1616 | ieee80211_rx_h_defragment, |
1617 | ieee80211_rx_h_ps_poll, | |
1618 | ieee80211_rx_h_michael_mic_verify, | |
1619 | /* this must be after decryption - so header is counted in MPDU mic | |
1620 | * must be before pae and data, so QOS_DATA format frames | |
1621 | * are not passed to user space by these functions | |
1622 | */ | |
1623 | ieee80211_rx_h_remove_qos_control, | |
fd4c7f2f | 1624 | ieee80211_rx_h_amsdu, |
571ecf67 | 1625 | ieee80211_rx_h_data, |
71364716 | 1626 | ieee80211_rx_h_ctrl, |
571ecf67 JB |
1627 | ieee80211_rx_h_mgmt, |
1628 | NULL | |
1629 | }; | |
1630 | ||
8944b79f | 1631 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
58905290 | 1632 | struct ieee80211_txrx_data *rx, |
8944b79f | 1633 | struct sk_buff *skb) |
58905290 JB |
1634 | { |
1635 | ieee80211_rx_handler *handler; | |
1636 | ieee80211_rx_result res = RX_DROP_MONITOR; | |
1637 | ||
8944b79f JB |
1638 | rx->skb = skb; |
1639 | rx->sdata = sdata; | |
1640 | rx->dev = sdata->dev; | |
1641 | ||
58905290 JB |
1642 | for (handler = ieee80211_rx_handlers; *handler != NULL; handler++) { |
1643 | res = (*handler)(rx); | |
1644 | ||
1645 | switch (res) { | |
1646 | case RX_CONTINUE: | |
1647 | continue; | |
1648 | case RX_DROP_UNUSABLE: | |
1649 | case RX_DROP_MONITOR: | |
8944b79f JB |
1650 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1651 | if (rx->sta) | |
1652 | rx->sta->rx_dropped++; | |
58905290 JB |
1653 | break; |
1654 | case RX_QUEUED: | |
8944b79f | 1655 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); |
58905290 JB |
1656 | break; |
1657 | } | |
1658 | break; | |
1659 | } | |
1660 | ||
1661 | switch (res) { | |
3d30d949 | 1662 | case RX_CONTINUE: |
58905290 | 1663 | case RX_DROP_MONITOR: |
3d30d949 MW |
1664 | ieee80211_rx_cooked_monitor(rx); |
1665 | break; | |
58905290 | 1666 | case RX_DROP_UNUSABLE: |
58905290 JB |
1667 | dev_kfree_skb(rx->skb); |
1668 | break; | |
1669 | } | |
1670 | } | |
1671 | ||
571ecf67 JB |
1672 | /* main receive path */ |
1673 | ||
23a24def JB |
1674 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
1675 | u8 *bssid, struct ieee80211_txrx_data *rx, | |
1676 | struct ieee80211_hdr *hdr) | |
1677 | { | |
1678 | int multicast = is_multicast_ether_addr(hdr->addr1); | |
1679 | ||
51fb61e7 | 1680 | switch (sdata->vif.type) { |
23a24def JB |
1681 | case IEEE80211_IF_TYPE_STA: |
1682 | if (!bssid) | |
1683 | return 0; | |
1684 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
badffb72 | 1685 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1686 | return 0; |
badffb72 | 1687 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1688 | } else if (!multicast && |
1689 | compare_ether_addr(sdata->dev->dev_addr, | |
1690 | hdr->addr1) != 0) { | |
4150c572 | 1691 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1692 | return 0; |
badffb72 | 1693 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1694 | } |
1695 | break; | |
1696 | case IEEE80211_IF_TYPE_IBSS: | |
1697 | if (!bssid) | |
1698 | return 0; | |
9d9bf77d BR |
1699 | if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT && |
1700 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) | |
1701 | return 1; | |
1702 | else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
badffb72 | 1703 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1704 | return 0; |
badffb72 | 1705 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1706 | } else if (!multicast && |
1707 | compare_ether_addr(sdata->dev->dev_addr, | |
1708 | hdr->addr1) != 0) { | |
4150c572 | 1709 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1710 | return 0; |
badffb72 | 1711 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1712 | } else if (!rx->sta) |
1713 | rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb, | |
1714 | bssid, hdr->addr2); | |
1715 | break; | |
fb1c1cd6 | 1716 | case IEEE80211_IF_TYPE_VLAN: |
23a24def JB |
1717 | case IEEE80211_IF_TYPE_AP: |
1718 | if (!bssid) { | |
1719 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1720 | hdr->addr1)) | |
1721 | return 0; | |
1722 | } else if (!ieee80211_bssid_match(bssid, | |
1723 | sdata->dev->dev_addr)) { | |
badffb72 | 1724 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1725 | return 0; |
badffb72 | 1726 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def | 1727 | } |
badffb72 JS |
1728 | if (sdata->dev == sdata->local->mdev && |
1729 | !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) | |
23a24def JB |
1730 | /* do not receive anything via |
1731 | * master device when not scanning */ | |
1732 | return 0; | |
1733 | break; | |
1734 | case IEEE80211_IF_TYPE_WDS: | |
1735 | if (bssid || | |
1736 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) | |
1737 | return 0; | |
1738 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
1739 | return 0; | |
1740 | break; | |
fb1c1cd6 JB |
1741 | case IEEE80211_IF_TYPE_MNTR: |
1742 | /* take everything */ | |
1743 | break; | |
a2897552 | 1744 | case IEEE80211_IF_TYPE_INVALID: |
fb1c1cd6 JB |
1745 | /* should never get here */ |
1746 | WARN_ON(1); | |
1747 | break; | |
23a24def JB |
1748 | } |
1749 | ||
1750 | return 1; | |
1751 | } | |
1752 | ||
571ecf67 | 1753 | /* |
6368e4b1 RR |
1754 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
1755 | * be called with rcu_read_lock protection. | |
571ecf67 | 1756 | */ |
71ebb4aa RR |
1757 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
1758 | struct sk_buff *skb, | |
1759 | struct ieee80211_rx_status *status, | |
8318d78a JB |
1760 | u32 load, |
1761 | struct ieee80211_rate *rate) | |
571ecf67 JB |
1762 | { |
1763 | struct ieee80211_local *local = hw_to_local(hw); | |
1764 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 JB |
1765 | struct ieee80211_hdr *hdr; |
1766 | struct ieee80211_txrx_data rx; | |
1767 | u16 type; | |
6368e4b1 | 1768 | int prepares; |
8e6f0032 JB |
1769 | struct ieee80211_sub_if_data *prev = NULL; |
1770 | struct sk_buff *skb_new; | |
1771 | u8 *bssid; | |
571ecf67 JB |
1772 | |
1773 | hdr = (struct ieee80211_hdr *) skb->data; | |
1774 | memset(&rx, 0, sizeof(rx)); | |
1775 | rx.skb = skb; | |
1776 | rx.local = local; | |
1777 | ||
1778 | rx.u.rx.status = status; | |
6368e4b1 | 1779 | rx.u.rx.load = load; |
8318d78a | 1780 | rx.u.rx.rate = rate; |
b2e7771e | 1781 | rx.fc = le16_to_cpu(hdr->frame_control); |
571ecf67 | 1782 | type = rx.fc & IEEE80211_FCTL_FTYPE; |
72abd81b | 1783 | |
b2e7771e | 1784 | if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT) |
571ecf67 | 1785 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 1786 | |
8944b79f JB |
1787 | rx.sta = sta_info_get(local, hdr->addr2); |
1788 | if (rx.sta) { | |
b2e7771e JB |
1789 | rx.dev = rx.sta->dev; |
1790 | rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev); | |
1791 | } | |
571ecf67 | 1792 | |
571ecf67 | 1793 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
8944b79f | 1794 | ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx); |
571ecf67 JB |
1795 | goto end; |
1796 | } | |
1797 | ||
ece8eddd | 1798 | if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning)) |
badffb72 | 1799 | rx.flags |= IEEE80211_TXRXD_RXIN_SCAN; |
571ecf67 | 1800 | |
38f3714d JB |
1801 | ieee80211_parse_qos(&rx); |
1802 | ieee80211_verify_ip_alignment(&rx); | |
1803 | ||
571ecf67 JB |
1804 | skb = rx.skb; |
1805 | ||
79010420 | 1806 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
1807 | if (!netif_running(sdata->dev)) |
1808 | continue; | |
1809 | ||
51fb61e7 | 1810 | if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) |
b2e7771e JB |
1811 | continue; |
1812 | ||
51fb61e7 | 1813 | bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); |
b2e7771e | 1814 | rx.flags |= IEEE80211_TXRXD_RXRA_MATCH; |
6368e4b1 | 1815 | prepares = prepare_for_handlers(sdata, bssid, &rx, hdr); |
23a24def | 1816 | |
6368e4b1 | 1817 | if (!prepares) |
23a24def | 1818 | continue; |
8e6f0032 | 1819 | |
340e11f3 JB |
1820 | /* |
1821 | * frame is destined for this interface, but if it's not | |
1822 | * also for the previous one we handle that after the | |
1823 | * loop to avoid copying the SKB once too much | |
1824 | */ | |
1825 | ||
1826 | if (!prev) { | |
1827 | prev = sdata; | |
1828 | continue; | |
8e6f0032 | 1829 | } |
340e11f3 JB |
1830 | |
1831 | /* | |
1832 | * frame was destined for the previous interface | |
1833 | * so invoke RX handlers for it | |
1834 | */ | |
1835 | ||
1836 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
1837 | if (!skb_new) { | |
1838 | if (net_ratelimit()) | |
1839 | printk(KERN_DEBUG "%s: failed to copy " | |
1840 | "multicast frame for %s", | |
dd1cd4c6 JB |
1841 | wiphy_name(local->hw.wiphy), |
1842 | prev->dev->name); | |
340e11f3 JB |
1843 | continue; |
1844 | } | |
69f817b6 | 1845 | rx.fc = le16_to_cpu(hdr->frame_control); |
8944b79f | 1846 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 1847 | prev = sdata; |
571ecf67 | 1848 | } |
8e6f0032 | 1849 | if (prev) { |
69f817b6 | 1850 | rx.fc = le16_to_cpu(hdr->frame_control); |
8944b79f | 1851 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
8e6f0032 JB |
1852 | } else |
1853 | dev_kfree_skb(skb); | |
571ecf67 | 1854 | |
8e6f0032 | 1855 | end: |
8944b79f JB |
1856 | if (rx.sta) |
1857 | sta_info_put(rx.sta); | |
571ecf67 | 1858 | } |
6368e4b1 | 1859 | |
b580781e RR |
1860 | #define SEQ_MODULO 0x1000 |
1861 | #define SEQ_MASK 0xfff | |
1862 | ||
1863 | static inline int seq_less(u16 sq1, u16 sq2) | |
1864 | { | |
1865 | return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1)); | |
1866 | } | |
1867 | ||
1868 | static inline u16 seq_inc(u16 sq) | |
1869 | { | |
1870 | return ((sq + 1) & SEQ_MASK); | |
1871 | } | |
1872 | ||
1873 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
1874 | { | |
1875 | return ((sq1 - sq2) & SEQ_MASK); | |
1876 | } | |
1877 | ||
1878 | ||
71364716 RR |
1879 | /* |
1880 | * As it function blongs to Rx path it must be called with | |
1881 | * the proper rcu_read_lock protection for its flow. | |
1882 | */ | |
b580781e RR |
1883 | u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
1884 | struct tid_ampdu_rx *tid_agg_rx, | |
1885 | struct sk_buff *skb, u16 mpdu_seq_num, | |
1886 | int bar_req) | |
1887 | { | |
1888 | struct ieee80211_local *local = hw_to_local(hw); | |
1889 | struct ieee80211_rx_status status; | |
1890 | u16 head_seq_num, buf_size; | |
1891 | int index; | |
1892 | u32 pkt_load; | |
8318d78a JB |
1893 | struct ieee80211_supported_band *sband; |
1894 | struct ieee80211_rate *rate; | |
b580781e RR |
1895 | |
1896 | buf_size = tid_agg_rx->buf_size; | |
1897 | head_seq_num = tid_agg_rx->head_seq_num; | |
1898 | ||
1899 | /* frame with out of date sequence number */ | |
1900 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
1901 | dev_kfree_skb(skb); | |
1902 | return 1; | |
1903 | } | |
1904 | ||
1905 | /* if frame sequence number exceeds our buffering window size or | |
1906 | * block Ack Request arrived - release stored frames */ | |
1907 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
1908 | /* new head to the ordering buffer */ | |
1909 | if (bar_req) | |
1910 | head_seq_num = mpdu_seq_num; | |
1911 | else | |
1912 | head_seq_num = | |
1913 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
1914 | /* release stored frames up to new head to stack */ | |
1915 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
1916 | index = seq_sub(tid_agg_rx->head_seq_num, | |
1917 | tid_agg_rx->ssn) | |
1918 | % tid_agg_rx->buf_size; | |
1919 | ||
1920 | if (tid_agg_rx->reorder_buf[index]) { | |
1921 | /* release the reordered frames to stack */ | |
1922 | memcpy(&status, | |
1923 | tid_agg_rx->reorder_buf[index]->cb, | |
1924 | sizeof(status)); | |
8318d78a JB |
1925 | sband = local->hw.wiphy->bands[status.band]; |
1926 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e RR |
1927 | pkt_load = ieee80211_rx_load_stats(local, |
1928 | tid_agg_rx->reorder_buf[index], | |
8318d78a | 1929 | &status, rate); |
b580781e RR |
1930 | __ieee80211_rx_handle_packet(hw, |
1931 | tid_agg_rx->reorder_buf[index], | |
8318d78a | 1932 | &status, pkt_load, rate); |
b580781e RR |
1933 | tid_agg_rx->stored_mpdu_num--; |
1934 | tid_agg_rx->reorder_buf[index] = NULL; | |
1935 | } | |
1936 | tid_agg_rx->head_seq_num = | |
1937 | seq_inc(tid_agg_rx->head_seq_num); | |
1938 | } | |
1939 | if (bar_req) | |
1940 | return 1; | |
1941 | } | |
1942 | ||
1943 | /* now the new frame is always in the range of the reordering */ | |
1944 | /* buffer window */ | |
1945 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
1946 | % tid_agg_rx->buf_size; | |
1947 | /* check if we already stored this frame */ | |
1948 | if (tid_agg_rx->reorder_buf[index]) { | |
1949 | dev_kfree_skb(skb); | |
1950 | return 1; | |
1951 | } | |
1952 | ||
1953 | /* if arrived mpdu is in the right order and nothing else stored */ | |
1954 | /* release it immediately */ | |
1955 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
1956 | tid_agg_rx->stored_mpdu_num == 0) { | |
1957 | tid_agg_rx->head_seq_num = | |
1958 | seq_inc(tid_agg_rx->head_seq_num); | |
1959 | return 0; | |
1960 | } | |
1961 | ||
1962 | /* put the frame in the reordering buffer */ | |
1963 | tid_agg_rx->reorder_buf[index] = skb; | |
1964 | tid_agg_rx->stored_mpdu_num++; | |
1965 | /* release the buffer until next missing frame */ | |
1966 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
1967 | % tid_agg_rx->buf_size; | |
1968 | while (tid_agg_rx->reorder_buf[index]) { | |
1969 | /* release the reordered frame back to stack */ | |
1970 | memcpy(&status, tid_agg_rx->reorder_buf[index]->cb, | |
1971 | sizeof(status)); | |
8318d78a JB |
1972 | sband = local->hw.wiphy->bands[status.band]; |
1973 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e RR |
1974 | pkt_load = ieee80211_rx_load_stats(local, |
1975 | tid_agg_rx->reorder_buf[index], | |
8318d78a | 1976 | &status, rate); |
b580781e | 1977 | __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index], |
8318d78a | 1978 | &status, pkt_load, rate); |
b580781e RR |
1979 | tid_agg_rx->stored_mpdu_num--; |
1980 | tid_agg_rx->reorder_buf[index] = NULL; | |
1981 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
1982 | index = seq_sub(tid_agg_rx->head_seq_num, | |
1983 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
1984 | } | |
1985 | return 1; | |
1986 | } | |
1987 | ||
71ebb4aa RR |
1988 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
1989 | struct sk_buff *skb) | |
b580781e RR |
1990 | { |
1991 | struct ieee80211_hw *hw = &local->hw; | |
1992 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1993 | struct sta_info *sta; | |
1994 | struct tid_ampdu_rx *tid_agg_rx; | |
1995 | u16 fc, sc; | |
1996 | u16 mpdu_seq_num; | |
1997 | u8 ret = 0, *qc; | |
1998 | int tid; | |
1999 | ||
2000 | sta = sta_info_get(local, hdr->addr2); | |
2001 | if (!sta) | |
2002 | return ret; | |
2003 | ||
2004 | fc = le16_to_cpu(hdr->frame_control); | |
2005 | ||
2006 | /* filter the QoS data rx stream according to | |
2007 | * STA/TID and check if this STA/TID is on aggregation */ | |
2008 | if (!WLAN_FC_IS_QOS_DATA(fc)) | |
2009 | goto end_reorder; | |
2010 | ||
2011 | qc = skb->data + ieee80211_get_hdrlen(fc) - QOS_CONTROL_LEN; | |
2012 | tid = qc[0] & QOS_CONTROL_TID_MASK; | |
2013 | tid_agg_rx = &(sta->ampdu_mlme.tid_rx[tid]); | |
2014 | ||
2015 | if (tid_agg_rx->state != HT_AGG_STATE_OPERATIONAL) | |
2016 | goto end_reorder; | |
2017 | ||
2018 | /* null data frames are excluded */ | |
8b6bbe75 | 2019 | if (unlikely(fc & IEEE80211_STYPE_NULLFUNC)) |
b580781e RR |
2020 | goto end_reorder; |
2021 | ||
2022 | /* new un-ordered ampdu frame - process it */ | |
2023 | ||
2024 | /* reset session timer */ | |
2025 | if (tid_agg_rx->timeout) { | |
2026 | unsigned long expires = | |
2027 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
2028 | mod_timer(&tid_agg_rx->session_timer, expires); | |
2029 | } | |
2030 | ||
2031 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2032 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2033 | if (sc & IEEE80211_SCTL_FRAG) { | |
2034 | ieee80211_sta_stop_rx_ba_session(sta->dev, sta->addr, | |
2035 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); | |
2036 | ret = 1; | |
2037 | goto end_reorder; | |
2038 | } | |
2039 | ||
2040 | /* according to mpdu sequence number deal with reordering buffer */ | |
2041 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
2042 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, | |
2043 | mpdu_seq_num, 0); | |
2044 | end_reorder: | |
2045 | if (sta) | |
2046 | sta_info_put(sta); | |
2047 | return ret; | |
2048 | } | |
2049 | ||
6368e4b1 RR |
2050 | /* |
2051 | * This is the receive path handler. It is called by a low level driver when an | |
2052 | * 802.11 MPDU is received from the hardware. | |
2053 | */ | |
2054 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2055 | struct ieee80211_rx_status *status) | |
2056 | { | |
2057 | struct ieee80211_local *local = hw_to_local(hw); | |
2058 | u32 pkt_load; | |
8318d78a JB |
2059 | struct ieee80211_rate *rate = NULL; |
2060 | struct ieee80211_supported_band *sband; | |
2061 | ||
2062 | if (status->band < 0 || | |
2063 | status->band > IEEE80211_NUM_BANDS) { | |
2064 | WARN_ON(1); | |
2065 | return; | |
2066 | } | |
2067 | ||
2068 | sband = local->hw.wiphy->bands[status->band]; | |
2069 | ||
2070 | if (!sband || | |
2071 | status->rate_idx < 0 || | |
2072 | status->rate_idx >= sband->n_bitrates) { | |
2073 | WARN_ON(1); | |
2074 | return; | |
2075 | } | |
2076 | ||
2077 | rate = &sband->bitrates[status->rate_idx]; | |
6368e4b1 RR |
2078 | |
2079 | /* | |
2080 | * key references and virtual interfaces are protected using RCU | |
2081 | * and this requires that we are in a read-side RCU section during | |
2082 | * receive processing | |
2083 | */ | |
2084 | rcu_read_lock(); | |
2085 | ||
2086 | /* | |
2087 | * Frames with failed FCS/PLCP checksum are not returned, | |
2088 | * all other frames are returned without radiotap header | |
2089 | * if it was previously present. | |
2090 | * Also, frames with less than 16 bytes are dropped. | |
2091 | */ | |
8318d78a | 2092 | skb = ieee80211_rx_monitor(local, skb, status, rate); |
6368e4b1 RR |
2093 | if (!skb) { |
2094 | rcu_read_unlock(); | |
2095 | return; | |
2096 | } | |
2097 | ||
8318d78a | 2098 | pkt_load = ieee80211_rx_load_stats(local, skb, status, rate); |
b580781e | 2099 | local->channel_use_raw += pkt_load; |
6368e4b1 | 2100 | |
b580781e | 2101 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
8318d78a | 2102 | __ieee80211_rx_handle_packet(hw, skb, status, pkt_load, rate); |
6368e4b1 RR |
2103 | |
2104 | rcu_read_unlock(); | |
2105 | } | |
571ecf67 JB |
2106 | EXPORT_SYMBOL(__ieee80211_rx); |
2107 | ||
2108 | /* This is a version of the rx handler that can be called from hard irq | |
2109 | * context. Post the skb on the queue and schedule the tasklet */ | |
2110 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2111 | struct ieee80211_rx_status *status) | |
2112 | { | |
2113 | struct ieee80211_local *local = hw_to_local(hw); | |
2114 | ||
2115 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2116 | ||
2117 | skb->dev = local->mdev; | |
2118 | /* copy status into skb->cb for use by tasklet */ | |
2119 | memcpy(skb->cb, status, sizeof(*status)); | |
2120 | skb->pkt_type = IEEE80211_RX_MSG; | |
2121 | skb_queue_tail(&local->skb_queue, skb); | |
2122 | tasklet_schedule(&local->tasklet); | |
2123 | } | |
2124 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |