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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 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/skbuff.h> | |
14 | #include <linux/netdevice.h> | |
15 | #include <linux/etherdevice.h> | |
d4e46a3d | 16 | #include <linux/rcupdate.h> |
571ecf67 JB |
17 | #include <net/mac80211.h> |
18 | #include <net/ieee80211_radiotap.h> | |
19 | ||
20 | #include "ieee80211_i.h" | |
21 | #include "ieee80211_led.h" | |
571ecf67 JB |
22 | #include "wep.h" |
23 | #include "wpa.h" | |
24 | #include "tkip.h" | |
25 | #include "wme.h" | |
26 | ||
71364716 RR |
27 | u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
28 | struct tid_ampdu_rx *tid_agg_rx, | |
29 | struct sk_buff *skb, u16 mpdu_seq_num, | |
30 | int bar_req); | |
b2e7771e JB |
31 | /* |
32 | * monitor mode reception | |
33 | * | |
34 | * This function cleans up the SKB, i.e. it removes all the stuff | |
35 | * only useful for monitoring. | |
36 | */ | |
37 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
38 | struct sk_buff *skb, | |
39 | int rtap_len) | |
40 | { | |
41 | skb_pull(skb, rtap_len); | |
42 | ||
43 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { | |
44 | if (likely(skb->len > FCS_LEN)) | |
45 | skb_trim(skb, skb->len - FCS_LEN); | |
46 | else { | |
47 | /* driver bug */ | |
48 | WARN_ON(1); | |
49 | dev_kfree_skb(skb); | |
50 | skb = NULL; | |
51 | } | |
52 | } | |
53 | ||
54 | return skb; | |
55 | } | |
56 | ||
57 | static inline int should_drop_frame(struct ieee80211_rx_status *status, | |
58 | struct sk_buff *skb, | |
59 | int present_fcs_len, | |
60 | int radiotap_len) | |
61 | { | |
62 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
63 | ||
64 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
65 | return 1; | |
66 | if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len)) | |
67 | return 1; | |
98f0b0a3 RR |
68 | if (((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FTYPE)) == |
69 | cpu_to_le16(IEEE80211_FTYPE_CTL)) && | |
70 | ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE)) != | |
71364716 RR |
71 | cpu_to_le16(IEEE80211_STYPE_PSPOLL)) && |
72 | ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE)) != | |
73 | cpu_to_le16(IEEE80211_STYPE_BACK_REQ))) | |
b2e7771e JB |
74 | return 1; |
75 | return 0; | |
76 | } | |
77 | ||
78 | /* | |
79 | * This function copies a received frame to all monitor interfaces and | |
80 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
81 | * radiotap header the driver might have added. | |
82 | */ | |
83 | static struct sk_buff * | |
84 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
85 | struct ieee80211_rx_status *status) | |
86 | { | |
87 | struct ieee80211_sub_if_data *sdata; | |
88 | struct ieee80211_rate *rate; | |
89 | int needed_headroom = 0; | |
c49e5ea3 JB |
90 | struct ieee80211_radiotap_header *rthdr; |
91 | __le64 *rttsft = NULL; | |
92 | struct ieee80211_rtap_fixed_data { | |
b2e7771e JB |
93 | u8 flags; |
94 | u8 rate; | |
95 | __le16 chan_freq; | |
96 | __le16 chan_flags; | |
97 | u8 antsignal; | |
98 | u8 padding_for_rxflags; | |
99 | __le16 rx_flags; | |
c49e5ea3 | 100 | } __attribute__ ((packed)) *rtfixed; |
b2e7771e JB |
101 | struct sk_buff *skb, *skb2; |
102 | struct net_device *prev_dev = NULL; | |
103 | int present_fcs_len = 0; | |
104 | int rtap_len = 0; | |
105 | ||
106 | /* | |
107 | * First, we may need to make a copy of the skb because | |
108 | * (1) we need to modify it for radiotap (if not present), and | |
109 | * (2) the other RX handlers will modify the skb we got. | |
110 | * | |
111 | * We don't need to, of course, if we aren't going to return | |
112 | * the SKB because it has a bad FCS/PLCP checksum. | |
113 | */ | |
114 | if (status->flag & RX_FLAG_RADIOTAP) | |
115 | rtap_len = ieee80211_get_radiotap_len(origskb->data); | |
116 | else | |
c49e5ea3 JB |
117 | /* room for radiotap header, always present fields and TSFT */ |
118 | needed_headroom = sizeof(*rthdr) + sizeof(*rtfixed) + 8; | |
b2e7771e JB |
119 | |
120 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
121 | present_fcs_len = FCS_LEN; | |
122 | ||
123 | if (!local->monitors) { | |
124 | if (should_drop_frame(status, origskb, present_fcs_len, | |
125 | rtap_len)) { | |
126 | dev_kfree_skb(origskb); | |
127 | return NULL; | |
128 | } | |
129 | ||
130 | return remove_monitor_info(local, origskb, rtap_len); | |
131 | } | |
132 | ||
133 | if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) { | |
134 | /* only need to expand headroom if necessary */ | |
135 | skb = origskb; | |
136 | origskb = NULL; | |
137 | ||
138 | /* | |
139 | * This shouldn't trigger often because most devices have an | |
140 | * RX header they pull before we get here, and that should | |
141 | * be big enough for our radiotap information. We should | |
142 | * probably export the length to drivers so that we can have | |
143 | * them allocate enough headroom to start with. | |
144 | */ | |
145 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 146 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
147 | dev_kfree_skb(skb); |
148 | return NULL; | |
149 | } | |
150 | } else { | |
151 | /* | |
152 | * Need to make a copy and possibly remove radiotap header | |
153 | * and FCS from the original. | |
154 | */ | |
155 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
156 | ||
157 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
158 | ||
159 | if (!skb) | |
160 | return origskb; | |
161 | } | |
162 | ||
163 | /* if necessary, prepend radiotap information */ | |
164 | if (!(status->flag & RX_FLAG_RADIOTAP)) { | |
c49e5ea3 JB |
165 | rtfixed = (void *) skb_push(skb, sizeof(*rtfixed)); |
166 | rtap_len = sizeof(*rthdr) + sizeof(*rtfixed); | |
167 | if (status->flag & RX_FLAG_TSFT) { | |
168 | rttsft = (void *) skb_push(skb, sizeof(*rttsft)); | |
169 | rtap_len += 8; | |
170 | } | |
b2e7771e JB |
171 | rthdr = (void *) skb_push(skb, sizeof(*rthdr)); |
172 | memset(rthdr, 0, sizeof(*rthdr)); | |
c49e5ea3 JB |
173 | memset(rtfixed, 0, sizeof(*rtfixed)); |
174 | rthdr->it_present = | |
b2e7771e JB |
175 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | |
176 | (1 << IEEE80211_RADIOTAP_RATE) | | |
177 | (1 << IEEE80211_RADIOTAP_CHANNEL) | | |
178 | (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL) | | |
179 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
c49e5ea3 JB |
180 | rtfixed->flags = 0; |
181 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
182 | rtfixed->flags |= IEEE80211_RADIOTAP_F_FCS; | |
183 | ||
184 | if (rttsft) { | |
185 | *rttsft = cpu_to_le64(status->mactime); | |
186 | rthdr->it_present |= | |
187 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
188 | } | |
b2e7771e JB |
189 | |
190 | /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */ | |
c49e5ea3 | 191 | rtfixed->rx_flags = 0; |
b2e7771e JB |
192 | if (status->flag & |
193 | (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
c49e5ea3 | 194 | rtfixed->rx_flags |= |
b2e7771e JB |
195 | cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS); |
196 | ||
197 | rate = ieee80211_get_rate(local, status->phymode, | |
198 | status->rate); | |
199 | if (rate) | |
c49e5ea3 | 200 | rtfixed->rate = rate->rate / 5; |
b2e7771e | 201 | |
c49e5ea3 | 202 | rtfixed->chan_freq = cpu_to_le16(status->freq); |
b2e7771e JB |
203 | |
204 | if (status->phymode == MODE_IEEE80211A) | |
c49e5ea3 | 205 | rtfixed->chan_flags = |
b2e7771e JB |
206 | cpu_to_le16(IEEE80211_CHAN_OFDM | |
207 | IEEE80211_CHAN_5GHZ); | |
208 | else | |
c49e5ea3 | 209 | rtfixed->chan_flags = |
b2e7771e JB |
210 | cpu_to_le16(IEEE80211_CHAN_DYN | |
211 | IEEE80211_CHAN_2GHZ); | |
212 | ||
c49e5ea3 JB |
213 | rtfixed->antsignal = status->ssi; |
214 | rthdr->it_len = cpu_to_le16(rtap_len); | |
b2e7771e JB |
215 | } |
216 | ||
ce3edf6d | 217 | skb_reset_mac_header(skb); |
b2e7771e JB |
218 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
219 | skb->pkt_type = PACKET_OTHERHOST; | |
220 | skb->protocol = htons(ETH_P_802_2); | |
221 | ||
222 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
223 | if (!netif_running(sdata->dev)) | |
224 | continue; | |
225 | ||
51fb61e7 | 226 | if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR) |
b2e7771e JB |
227 | continue; |
228 | ||
229 | if (prev_dev) { | |
230 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
231 | if (skb2) { | |
232 | skb2->dev = prev_dev; | |
233 | netif_rx(skb2); | |
234 | } | |
235 | } | |
236 | ||
237 | prev_dev = sdata->dev; | |
238 | sdata->dev->stats.rx_packets++; | |
239 | sdata->dev->stats.rx_bytes += skb->len; | |
240 | } | |
241 | ||
242 | if (prev_dev) { | |
243 | skb->dev = prev_dev; | |
244 | netif_rx(skb); | |
245 | } else | |
246 | dev_kfree_skb(skb); | |
247 | ||
248 | return origskb; | |
249 | } | |
250 | ||
251 | ||
571ecf67 JB |
252 | /* pre-rx handlers |
253 | * | |
254 | * these don't have dev/sdata fields in the rx data | |
52865dfd JB |
255 | * The sta value should also not be used because it may |
256 | * be NULL even though a STA (in IBSS mode) will be added. | |
571ecf67 JB |
257 | */ |
258 | ||
6e0d114d JB |
259 | static ieee80211_txrx_result |
260 | ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx) | |
261 | { | |
262 | u8 *data = rx->skb->data; | |
263 | int tid; | |
264 | ||
265 | /* does the frame have a qos control field? */ | |
266 | if (WLAN_FC_IS_QOS_DATA(rx->fc)) { | |
267 | u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN; | |
268 | /* frame has qos control */ | |
269 | tid = qc[0] & QOS_CONTROL_TID_MASK; | |
fd4c7f2f | 270 | if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) |
64bd4b69 | 271 | rx->flags |= IEEE80211_TXRXD_RX_AMSDU; |
fd4c7f2f | 272 | else |
64bd4b69 | 273 | rx->flags &= ~IEEE80211_TXRXD_RX_AMSDU; |
6e0d114d JB |
274 | } else { |
275 | if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) { | |
276 | /* Separate TID for management frames */ | |
277 | tid = NUM_RX_DATA_QUEUES - 1; | |
278 | } else { | |
279 | /* no qos control present */ | |
280 | tid = 0; /* 802.1d - Best Effort */ | |
281 | } | |
282 | } | |
52865dfd | 283 | |
6e0d114d | 284 | I802_DEBUG_INC(rx->local->wme_rx_queue[tid]); |
52865dfd JB |
285 | /* only a debug counter, sta might not be assigned properly yet */ |
286 | if (rx->sta) | |
6e0d114d | 287 | I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]); |
6e0d114d JB |
288 | |
289 | rx->u.rx.queue = tid; | |
290 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. | |
291 | * For now, set skb->priority to 0 for other cases. */ | |
292 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
293 | ||
294 | return TXRX_CONTINUE; | |
295 | } | |
296 | ||
6368e4b1 | 297 | |
71ebb4aa | 298 | static u32 ieee80211_rx_load_stats(struct ieee80211_local *local, |
6368e4b1 RR |
299 | struct sk_buff *skb, |
300 | struct ieee80211_rx_status *status) | |
571ecf67 | 301 | { |
571ecf67 JB |
302 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
303 | u32 load = 0, hdrtime; | |
304 | struct ieee80211_rate *rate; | |
305 | struct ieee80211_hw_mode *mode = local->hw.conf.mode; | |
306 | int i; | |
307 | ||
308 | /* Estimate total channel use caused by this frame */ | |
309 | ||
310 | if (unlikely(mode->num_rates < 0)) | |
311 | return TXRX_CONTINUE; | |
312 | ||
313 | rate = &mode->rates[0]; | |
314 | for (i = 0; i < mode->num_rates; i++) { | |
6368e4b1 | 315 | if (mode->rates[i].val == status->rate) { |
571ecf67 JB |
316 | rate = &mode->rates[i]; |
317 | break; | |
318 | } | |
319 | } | |
320 | ||
321 | /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values, | |
322 | * 1 usec = 1/8 * (1080 / 10) = 13.5 */ | |
323 | ||
324 | if (mode->mode == MODE_IEEE80211A || | |
571ecf67 JB |
325 | (mode->mode == MODE_IEEE80211G && |
326 | rate->flags & IEEE80211_RATE_ERP)) | |
327 | hdrtime = CHAN_UTIL_HDR_SHORT; | |
328 | else | |
329 | hdrtime = CHAN_UTIL_HDR_LONG; | |
330 | ||
331 | load = hdrtime; | |
332 | if (!is_multicast_ether_addr(hdr->addr1)) | |
333 | load += hdrtime; | |
334 | ||
335 | load += skb->len * rate->rate_inv; | |
336 | ||
337 | /* Divide channel_use by 8 to avoid wrapping around the counter */ | |
338 | load >>= CHAN_UTIL_SHIFT; | |
571ecf67 | 339 | |
6368e4b1 | 340 | return load; |
571ecf67 JB |
341 | } |
342 | ||
691ba234 JB |
343 | static ieee80211_txrx_result |
344 | ieee80211_rx_h_verify_ip_alignment(struct ieee80211_txrx_data *rx) | |
345 | { | |
346 | int hdrlen; | |
347 | ||
348 | /* | |
349 | * Drivers are required to align the payload data in a way that | |
350 | * guarantees that the contained IP header is aligned to a four- | |
351 | * byte boundary. In the case of regular frames, this simply means | |
352 | * aligning the payload to a four-byte boundary (because either | |
353 | * the IP header is directly contained, or IV/RFC1042 headers that | |
354 | * have a length divisible by four are in front of it. | |
355 | * | |
356 | * With A-MSDU frames, however, the payload data address must | |
357 | * yield two modulo four because there are 14-byte 802.3 headers | |
358 | * within the A-MSDU frames that push the IP header further back | |
359 | * to a multiple of four again. Thankfully, the specs were sane | |
360 | * enough this time around to require padding each A-MSDU subframe | |
361 | * to a length that is a multiple of four. | |
362 | * | |
363 | * Padding like atheros hardware adds which is inbetween the 802.11 | |
364 | * header and the payload is not supported, the driver is required | |
365 | * to move the 802.11 header further back in that case. | |
366 | */ | |
367 | hdrlen = ieee80211_get_hdrlen(rx->fc); | |
368 | if (rx->flags & IEEE80211_TXRXD_RX_AMSDU) | |
369 | hdrlen += ETH_HLEN; | |
370 | WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3); | |
371 | ||
372 | return TXRX_CONTINUE; | |
373 | } | |
374 | ||
571ecf67 JB |
375 | ieee80211_rx_handler ieee80211_rx_pre_handlers[] = |
376 | { | |
377 | ieee80211_rx_h_parse_qos, | |
691ba234 | 378 | ieee80211_rx_h_verify_ip_alignment, |
571ecf67 JB |
379 | NULL |
380 | }; | |
381 | ||
382 | /* rx handlers */ | |
383 | ||
384 | static ieee80211_txrx_result | |
385 | ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx) | |
386 | { | |
52865dfd JB |
387 | if (rx->sta) |
388 | rx->sta->channel_use_raw += rx->u.rx.load; | |
571ecf67 JB |
389 | rx->sdata->channel_use_raw += rx->u.rx.load; |
390 | return TXRX_CONTINUE; | |
391 | } | |
392 | ||
571ecf67 JB |
393 | static ieee80211_txrx_result |
394 | ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx) | |
395 | { | |
396 | struct ieee80211_local *local = rx->local; | |
397 | struct sk_buff *skb = rx->skb; | |
398 | ||
ece8eddd ZY |
399 | if (unlikely(local->sta_hw_scanning)) |
400 | return ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status); | |
401 | ||
402 | if (unlikely(local->sta_sw_scanning)) { | |
403 | /* drop all the other packets during a software scan anyway */ | |
404 | if (ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status) | |
405 | != TXRX_QUEUED) | |
406 | dev_kfree_skb(skb); | |
571ecf67 JB |
407 | return TXRX_QUEUED; |
408 | } | |
409 | ||
badffb72 | 410 | if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) { |
571ecf67 JB |
411 | /* scanning finished during invoking of handlers */ |
412 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
413 | return TXRX_DROP; | |
414 | } | |
415 | ||
416 | return TXRX_CONTINUE; | |
417 | } | |
418 | ||
419 | static ieee80211_txrx_result | |
420 | ieee80211_rx_h_check(struct ieee80211_txrx_data *rx) | |
421 | { | |
422 | struct ieee80211_hdr *hdr; | |
571ecf67 JB |
423 | hdr = (struct ieee80211_hdr *) rx->skb->data; |
424 | ||
425 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
426 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
427 | if (unlikely(rx->fc & IEEE80211_FCTL_RETRY && | |
428 | rx->sta->last_seq_ctrl[rx->u.rx.queue] == | |
429 | hdr->seq_ctrl)) { | |
badffb72 | 430 | if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) { |
571ecf67 JB |
431 | rx->local->dot11FrameDuplicateCount++; |
432 | rx->sta->num_duplicates++; | |
433 | } | |
434 | return TXRX_DROP; | |
435 | } else | |
436 | rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl; | |
437 | } | |
438 | ||
571ecf67 JB |
439 | if (unlikely(rx->skb->len < 16)) { |
440 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
441 | return TXRX_DROP; | |
442 | } | |
443 | ||
571ecf67 JB |
444 | /* Drop disallowed frame classes based on STA auth/assoc state; |
445 | * IEEE 802.11, Chap 5.5. | |
446 | * | |
447 | * 80211.o does filtering only based on association state, i.e., it | |
448 | * drops Class 3 frames from not associated stations. hostapd sends | |
449 | * deauth/disassoc frames when needed. In addition, hostapd is | |
450 | * responsible for filtering on both auth and assoc states. | |
451 | */ | |
452 | if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA || | |
453 | ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL && | |
454 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) && | |
51fb61e7 | 455 | rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS && |
571ecf67 JB |
456 | (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) { |
457 | if ((!(rx->fc & IEEE80211_FCTL_FROMDS) && | |
458 | !(rx->fc & IEEE80211_FCTL_TODS) && | |
459 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) | |
badffb72 | 460 | || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) { |
571ecf67 JB |
461 | /* Drop IBSS frames and frames for other hosts |
462 | * silently. */ | |
463 | return TXRX_DROP; | |
464 | } | |
465 | ||
f9d540ee | 466 | return TXRX_DROP; |
571ecf67 JB |
467 | } |
468 | ||
570bd537 JB |
469 | return TXRX_CONTINUE; |
470 | } | |
471 | ||
472 | ||
473 | static ieee80211_txrx_result | |
1990af8d | 474 | ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx) |
570bd537 JB |
475 | { |
476 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
3017b80b JB |
477 | int keyidx; |
478 | int hdrlen; | |
e2f036da | 479 | ieee80211_txrx_result result = TXRX_DROP; |
d4e46a3d | 480 | struct ieee80211_key *stakey = NULL; |
570bd537 | 481 | |
3017b80b JB |
482 | /* |
483 | * Key selection 101 | |
484 | * | |
485 | * There are three types of keys: | |
486 | * - GTK (group keys) | |
487 | * - PTK (pairwise keys) | |
488 | * - STK (station-to-station pairwise keys) | |
489 | * | |
490 | * When selecting a key, we have to distinguish between multicast | |
491 | * (including broadcast) and unicast frames, the latter can only | |
492 | * use PTKs and STKs while the former always use GTKs. Unless, of | |
493 | * course, actual WEP keys ("pre-RSNA") are used, then unicast | |
494 | * frames can also use key indizes like GTKs. Hence, if we don't | |
495 | * have a PTK/STK we check the key index for a WEP key. | |
496 | * | |
8dc06a1c JB |
497 | * Note that in a regular BSS, multicast frames are sent by the |
498 | * AP only, associated stations unicast the frame to the AP first | |
499 | * which then multicasts it on their behalf. | |
500 | * | |
3017b80b JB |
501 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
502 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
503 | * The spec seems to expect that one negotiates the same key with |
504 | * every station but there's no such requirement; VLANs could be | |
505 | * possible. | |
3017b80b JB |
506 | */ |
507 | ||
508 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) | |
509 | return TXRX_CONTINUE; | |
571ecf67 | 510 | |
3017b80b | 511 | /* |
1990af8d | 512 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
513 | * addressed to us nor a multicast frame. |
514 | */ | |
badffb72 | 515 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
3017b80b JB |
516 | return TXRX_CONTINUE; |
517 | ||
d4e46a3d JB |
518 | if (rx->sta) |
519 | stakey = rcu_dereference(rx->sta->key); | |
520 | ||
521 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { | |
522 | rx->key = stakey; | |
571ecf67 | 523 | } else { |
3017b80b JB |
524 | /* |
525 | * The device doesn't give us the IV so we won't be | |
526 | * able to look up the key. That's ok though, we | |
527 | * don't need to decrypt the frame, we just won't | |
528 | * be able to keep statistics accurate. | |
529 | * Except for key threshold notifications, should | |
530 | * we somehow allow the driver to tell us which key | |
531 | * the hardware used if this flag is set? | |
532 | */ | |
7848ba7d JB |
533 | if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) && |
534 | (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED)) | |
3017b80b JB |
535 | return TXRX_CONTINUE; |
536 | ||
537 | hdrlen = ieee80211_get_hdrlen(rx->fc); | |
538 | ||
539 | if (rx->skb->len < 8 + hdrlen) | |
540 | return TXRX_DROP; /* TODO: count this? */ | |
541 | ||
542 | /* | |
543 | * no need to call ieee80211_wep_get_keyidx, | |
544 | * it verifies a bunch of things we've done already | |
545 | */ | |
546 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
547 | ||
d4e46a3d | 548 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
549 | |
550 | /* | |
551 | * RSNA-protected unicast frames should always be sent with | |
552 | * pairwise or station-to-station keys, but for WEP we allow | |
553 | * using a key index as well. | |
554 | */ | |
8f20fc24 | 555 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
556 | !is_multicast_ether_addr(hdr->addr1)) |
557 | rx->key = NULL; | |
571ecf67 JB |
558 | } |
559 | ||
3017b80b | 560 | if (rx->key) { |
571ecf67 | 561 | rx->key->tx_rx_count++; |
011bfcc4 | 562 | /* TODO: add threshold stuff again */ |
1990af8d | 563 | } else { |
7f3ad894 | 564 | #ifdef CONFIG_MAC80211_DEBUG |
70f08765 JB |
565 | if (net_ratelimit()) |
566 | printk(KERN_DEBUG "%s: RX protected frame," | |
567 | " but have no key\n", rx->dev->name); | |
7f3ad894 | 568 | #endif /* CONFIG_MAC80211_DEBUG */ |
70f08765 JB |
569 | return TXRX_DROP; |
570 | } | |
571 | ||
1990af8d JB |
572 | /* Check for weak IVs if possible */ |
573 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
574 | ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) && | |
575 | (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) || | |
576 | !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) && | |
577 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) | |
578 | rx->sta->wep_weak_iv_count++; | |
579 | ||
70f08765 JB |
580 | switch (rx->key->conf.alg) { |
581 | case ALG_WEP: | |
e2f036da MN |
582 | result = ieee80211_crypto_wep_decrypt(rx); |
583 | break; | |
70f08765 | 584 | case ALG_TKIP: |
e2f036da MN |
585 | result = ieee80211_crypto_tkip_decrypt(rx); |
586 | break; | |
70f08765 | 587 | case ALG_CCMP: |
e2f036da MN |
588 | result = ieee80211_crypto_ccmp_decrypt(rx); |
589 | break; | |
70f08765 JB |
590 | } |
591 | ||
e2f036da MN |
592 | /* either the frame has been decrypted or will be dropped */ |
593 | rx->u.rx.status->flag |= RX_FLAG_DECRYPTED; | |
594 | ||
595 | return result; | |
70f08765 JB |
596 | } |
597 | ||
571ecf67 JB |
598 | static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta) |
599 | { | |
600 | struct ieee80211_sub_if_data *sdata; | |
0795af57 JP |
601 | DECLARE_MAC_BUF(mac); |
602 | ||
571ecf67 JB |
603 | sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); |
604 | ||
605 | if (sdata->bss) | |
606 | atomic_inc(&sdata->bss->num_sta_ps); | |
607 | sta->flags |= WLAN_STA_PS; | |
608 | sta->pspoll = 0; | |
609 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
610 | printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n", |
611 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 JB |
612 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
613 | } | |
614 | ||
615 | static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta) | |
616 | { | |
617 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
618 | struct sk_buff *skb; | |
619 | int sent = 0; | |
620 | struct ieee80211_sub_if_data *sdata; | |
621 | struct ieee80211_tx_packet_data *pkt_data; | |
0795af57 | 622 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
623 | |
624 | sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); | |
625 | if (sdata->bss) | |
626 | atomic_dec(&sdata->bss->num_sta_ps); | |
627 | sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM); | |
628 | sta->pspoll = 0; | |
629 | if (!skb_queue_empty(&sta->ps_tx_buf)) { | |
630 | if (local->ops->set_tim) | |
631 | local->ops->set_tim(local_to_hw(local), sta->aid, 0); | |
632 | if (sdata->bss) | |
633 | bss_tim_clear(local, sdata->bss, sta->aid); | |
634 | } | |
635 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
636 | printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n", |
637 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 JB |
638 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
639 | /* Send all buffered frames to the station */ | |
640 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
641 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; | |
642 | sent++; | |
e8bf9649 | 643 | pkt_data->flags |= IEEE80211_TXPD_REQUEUE; |
571ecf67 JB |
644 | dev_queue_xmit(skb); |
645 | } | |
646 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
647 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; | |
648 | local->total_ps_buffered--; | |
649 | sent++; | |
650 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 | 651 | printk(KERN_DEBUG "%s: STA %s aid %d send PS frame " |
571ecf67 | 652 | "since STA not sleeping anymore\n", dev->name, |
0795af57 | 653 | print_mac(mac, sta->addr), sta->aid); |
571ecf67 | 654 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
e8bf9649 | 655 | pkt_data->flags |= IEEE80211_TXPD_REQUEUE; |
571ecf67 JB |
656 | dev_queue_xmit(skb); |
657 | } | |
658 | ||
659 | return sent; | |
660 | } | |
661 | ||
662 | static ieee80211_txrx_result | |
663 | ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx) | |
664 | { | |
665 | struct sta_info *sta = rx->sta; | |
666 | struct net_device *dev = rx->dev; | |
667 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
668 | ||
669 | if (!sta) | |
670 | return TXRX_CONTINUE; | |
671 | ||
672 | /* Update last_rx only for IBSS packets which are for the current | |
673 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
674 | * other STAs are using different BSSID. */ | |
51fb61e7 | 675 | if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) { |
71364716 RR |
676 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
677 | IEEE80211_IF_TYPE_IBSS); | |
571ecf67 JB |
678 | if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0) |
679 | sta->last_rx = jiffies; | |
680 | } else | |
681 | if (!is_multicast_ether_addr(hdr->addr1) || | |
51fb61e7 | 682 | rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) { |
571ecf67 JB |
683 | /* Update last_rx only for unicast frames in order to prevent |
684 | * the Probe Request frames (the only broadcast frames from a | |
685 | * STA in infrastructure mode) from keeping a connection alive. | |
686 | */ | |
687 | sta->last_rx = jiffies; | |
688 | } | |
689 | ||
badffb72 | 690 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
571ecf67 JB |
691 | return TXRX_CONTINUE; |
692 | ||
693 | sta->rx_fragments++; | |
694 | sta->rx_bytes += rx->skb->len; | |
6c55aa97 LF |
695 | sta->last_rssi = rx->u.rx.status->ssi; |
696 | sta->last_signal = rx->u.rx.status->signal; | |
697 | sta->last_noise = rx->u.rx.status->noise; | |
571ecf67 JB |
698 | |
699 | if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) { | |
700 | /* Change STA power saving mode only in the end of a frame | |
701 | * exchange sequence */ | |
702 | if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM)) | |
703 | rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta); | |
704 | else if (!(sta->flags & WLAN_STA_PS) && | |
705 | (rx->fc & IEEE80211_FCTL_PM)) | |
706 | ap_sta_ps_start(dev, sta); | |
707 | } | |
708 | ||
709 | /* Drop data::nullfunc frames silently, since they are used only to | |
710 | * control station power saving mode. */ | |
711 | if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
712 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) { | |
713 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); | |
714 | /* Update counter and free packet here to avoid counting this | |
715 | * as a dropped packed. */ | |
716 | sta->rx_packets++; | |
717 | dev_kfree_skb(rx->skb); | |
718 | return TXRX_QUEUED; | |
719 | } | |
720 | ||
721 | return TXRX_CONTINUE; | |
722 | } /* ieee80211_rx_h_sta_process */ | |
723 | ||
571ecf67 JB |
724 | static inline struct ieee80211_fragment_entry * |
725 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
726 | unsigned int frag, unsigned int seq, int rx_queue, | |
727 | struct sk_buff **skb) | |
728 | { | |
729 | struct ieee80211_fragment_entry *entry; | |
730 | int idx; | |
731 | ||
732 | idx = sdata->fragment_next; | |
733 | entry = &sdata->fragments[sdata->fragment_next++]; | |
734 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
735 | sdata->fragment_next = 0; | |
736 | ||
737 | if (!skb_queue_empty(&entry->skb_list)) { | |
738 | #ifdef CONFIG_MAC80211_DEBUG | |
739 | struct ieee80211_hdr *hdr = | |
740 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
0795af57 JP |
741 | DECLARE_MAC_BUF(mac); |
742 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
743 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " |
744 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0795af57 | 745 | "addr1=%s addr2=%s\n", |
571ecf67 JB |
746 | sdata->dev->name, idx, |
747 | jiffies - entry->first_frag_time, entry->seq, | |
0795af57 JP |
748 | entry->last_frag, print_mac(mac, hdr->addr1), |
749 | print_mac(mac2, hdr->addr2)); | |
571ecf67 JB |
750 | #endif /* CONFIG_MAC80211_DEBUG */ |
751 | __skb_queue_purge(&entry->skb_list); | |
752 | } | |
753 | ||
754 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
755 | *skb = NULL; | |
756 | entry->first_frag_time = jiffies; | |
757 | entry->seq = seq; | |
758 | entry->rx_queue = rx_queue; | |
759 | entry->last_frag = frag; | |
760 | entry->ccmp = 0; | |
761 | entry->extra_len = 0; | |
762 | ||
763 | return entry; | |
764 | } | |
765 | ||
766 | static inline struct ieee80211_fragment_entry * | |
767 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
768 | u16 fc, unsigned int frag, unsigned int seq, | |
769 | int rx_queue, struct ieee80211_hdr *hdr) | |
770 | { | |
771 | struct ieee80211_fragment_entry *entry; | |
772 | int i, idx; | |
773 | ||
774 | idx = sdata->fragment_next; | |
775 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
776 | struct ieee80211_hdr *f_hdr; | |
777 | u16 f_fc; | |
778 | ||
779 | idx--; | |
780 | if (idx < 0) | |
781 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
782 | ||
783 | entry = &sdata->fragments[idx]; | |
784 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
785 | entry->rx_queue != rx_queue || | |
786 | entry->last_frag + 1 != frag) | |
787 | continue; | |
788 | ||
789 | f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data; | |
790 | f_fc = le16_to_cpu(f_hdr->frame_control); | |
791 | ||
792 | if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) || | |
793 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || | |
794 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
795 | continue; | |
796 | ||
797 | if (entry->first_frag_time + 2 * HZ < jiffies) { | |
798 | __skb_queue_purge(&entry->skb_list); | |
799 | continue; | |
800 | } | |
801 | return entry; | |
802 | } | |
803 | ||
804 | return NULL; | |
805 | } | |
806 | ||
807 | static ieee80211_txrx_result | |
808 | ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx) | |
809 | { | |
810 | struct ieee80211_hdr *hdr; | |
811 | u16 sc; | |
812 | unsigned int frag, seq; | |
813 | struct ieee80211_fragment_entry *entry; | |
814 | struct sk_buff *skb; | |
0795af57 | 815 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
816 | |
817 | hdr = (struct ieee80211_hdr *) rx->skb->data; | |
818 | sc = le16_to_cpu(hdr->seq_ctrl); | |
819 | frag = sc & IEEE80211_SCTL_FRAG; | |
820 | ||
821 | if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) || | |
822 | (rx->skb)->len < 24 || | |
823 | is_multicast_ether_addr(hdr->addr1))) { | |
824 | /* not fragmented */ | |
825 | goto out; | |
826 | } | |
827 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
828 | ||
829 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
830 | ||
831 | if (frag == 0) { | |
832 | /* This is the first fragment of a new frame. */ | |
833 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
834 | rx->u.rx.queue, &(rx->skb)); | |
8f20fc24 | 835 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
571ecf67 JB |
836 | (rx->fc & IEEE80211_FCTL_PROTECTED)) { |
837 | /* Store CCMP PN so that we can verify that the next | |
838 | * fragment has a sequential PN value. */ | |
839 | entry->ccmp = 1; | |
840 | memcpy(entry->last_pn, | |
841 | rx->key->u.ccmp.rx_pn[rx->u.rx.queue], | |
842 | CCMP_PN_LEN); | |
843 | } | |
844 | return TXRX_QUEUED; | |
845 | } | |
846 | ||
847 | /* This is a fragment for a frame that should already be pending in | |
848 | * fragment cache. Add this fragment to the end of the pending entry. | |
849 | */ | |
850 | entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq, | |
851 | rx->u.rx.queue, hdr); | |
852 | if (!entry) { | |
853 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
854 | return TXRX_DROP; | |
855 | } | |
856 | ||
857 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
858 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
859 | if (entry->ccmp) { | |
860 | int i; | |
861 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 862 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
571ecf67 JB |
863 | return TXRX_DROP; |
864 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); | |
865 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
866 | pn[i]++; | |
867 | if (pn[i]) | |
868 | break; | |
869 | } | |
870 | rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue]; | |
871 | if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) { | |
1a84f3fd JB |
872 | if (net_ratelimit()) |
873 | printk(KERN_DEBUG "%s: defrag: CCMP PN not " | |
0795af57 | 874 | "sequential A2=%s" |
1a84f3fd JB |
875 | " PN=%02x%02x%02x%02x%02x%02x " |
876 | "(expected %02x%02x%02x%02x%02x%02x)\n", | |
0795af57 | 877 | rx->dev->name, print_mac(mac, hdr->addr2), |
1a84f3fd JB |
878 | rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], |
879 | rpn[5], pn[0], pn[1], pn[2], pn[3], | |
880 | pn[4], pn[5]); | |
571ecf67 JB |
881 | return TXRX_DROP; |
882 | } | |
883 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); | |
884 | } | |
885 | ||
886 | skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc)); | |
887 | __skb_queue_tail(&entry->skb_list, rx->skb); | |
888 | entry->last_frag = frag; | |
889 | entry->extra_len += rx->skb->len; | |
890 | if (rx->fc & IEEE80211_FCTL_MOREFRAGS) { | |
891 | rx->skb = NULL; | |
892 | return TXRX_QUEUED; | |
893 | } | |
894 | ||
895 | rx->skb = __skb_dequeue(&entry->skb_list); | |
896 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
897 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
898 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
899 | GFP_ATOMIC))) { | |
900 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
901 | __skb_queue_purge(&entry->skb_list); | |
902 | return TXRX_DROP; | |
903 | } | |
904 | } | |
905 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
906 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
907 | dev_kfree_skb(skb); | |
908 | } | |
909 | ||
910 | /* Complete frame has been reassembled - process it now */ | |
badffb72 | 911 | rx->flags |= IEEE80211_TXRXD_FRAGMENTED; |
571ecf67 JB |
912 | |
913 | out: | |
914 | if (rx->sta) | |
915 | rx->sta->rx_packets++; | |
916 | if (is_multicast_ether_addr(hdr->addr1)) | |
917 | rx->local->dot11MulticastReceivedFrameCount++; | |
918 | else | |
919 | ieee80211_led_rx(rx->local); | |
920 | return TXRX_CONTINUE; | |
921 | } | |
922 | ||
923 | static ieee80211_txrx_result | |
924 | ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx) | |
925 | { | |
98f0b0a3 | 926 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
927 | struct sk_buff *skb; |
928 | int no_pending_pkts; | |
0795af57 | 929 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
930 | |
931 | if (likely(!rx->sta || | |
932 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL || | |
933 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL || | |
badffb72 | 934 | !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))) |
571ecf67 JB |
935 | return TXRX_CONTINUE; |
936 | ||
51fb61e7 JB |
937 | if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) && |
938 | (sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) | |
98f0b0a3 RR |
939 | return TXRX_DROP; |
940 | ||
571ecf67 JB |
941 | skb = skb_dequeue(&rx->sta->tx_filtered); |
942 | if (!skb) { | |
943 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
944 | if (skb) | |
945 | rx->local->total_ps_buffered--; | |
946 | } | |
947 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
948 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
949 | ||
950 | if (skb) { | |
951 | struct ieee80211_hdr *hdr = | |
952 | (struct ieee80211_hdr *) skb->data; | |
953 | ||
954 | /* tell TX path to send one frame even though the STA may | |
955 | * still remain is PS mode after this frame exchange */ | |
956 | rx->sta->pspoll = 1; | |
957 | ||
958 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
959 | printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n", |
960 | print_mac(mac, rx->sta->addr), rx->sta->aid, | |
571ecf67 JB |
961 | skb_queue_len(&rx->sta->ps_tx_buf)); |
962 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
963 | ||
964 | /* Use MoreData flag to indicate whether there are more | |
965 | * buffered frames for this STA */ | |
966 | if (no_pending_pkts) { | |
967 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); | |
968 | rx->sta->flags &= ~WLAN_STA_TIM; | |
969 | } else | |
970 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
971 | ||
972 | dev_queue_xmit(skb); | |
973 | ||
974 | if (no_pending_pkts) { | |
975 | if (rx->local->ops->set_tim) | |
976 | rx->local->ops->set_tim(local_to_hw(rx->local), | |
977 | rx->sta->aid, 0); | |
978 | if (rx->sdata->bss) | |
979 | bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid); | |
980 | } | |
981 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
982 | } else if (!rx->u.rx.sent_ps_buffered) { | |
0795af57 | 983 | printk(KERN_DEBUG "%s: STA %s sent PS Poll even " |
571ecf67 | 984 | "though there is no buffered frames for it\n", |
0795af57 | 985 | rx->dev->name, print_mac(mac, rx->sta->addr)); |
571ecf67 JB |
986 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
987 | ||
988 | } | |
989 | ||
990 | /* Free PS Poll skb here instead of returning TXRX_DROP that would | |
991 | * count as an dropped frame. */ | |
992 | dev_kfree_skb(rx->skb); | |
993 | ||
994 | return TXRX_QUEUED; | |
995 | } | |
996 | ||
6e0d114d JB |
997 | static ieee80211_txrx_result |
998 | ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx) | |
999 | { | |
1000 | u16 fc = rx->fc; | |
1001 | u8 *data = rx->skb->data; | |
1002 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data; | |
1003 | ||
1004 | if (!WLAN_FC_IS_QOS_DATA(fc)) | |
1005 | return TXRX_CONTINUE; | |
1006 | ||
1007 | /* remove the qos control field, update frame type and meta-data */ | |
1008 | memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2); | |
1009 | hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2); | |
1010 | /* change frame type to non QOS */ | |
1011 | rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA; | |
1012 | hdr->frame_control = cpu_to_le16(fc); | |
1013 | ||
1014 | return TXRX_CONTINUE; | |
1015 | } | |
1016 | ||
76ee65bf | 1017 | static int |
ce3edf6d | 1018 | ieee80211_802_1x_port_control(struct ieee80211_txrx_data *rx) |
571ecf67 | 1019 | { |
ce3edf6d JB |
1020 | if (unlikely(rx->sdata->ieee802_1x_pac && |
1021 | (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)))) { | |
571ecf67 | 1022 | #ifdef CONFIG_MAC80211_DEBUG |
76ee65bf RR |
1023 | printk(KERN_DEBUG "%s: dropped frame " |
1024 | "(unauthorized port)\n", rx->dev->name); | |
571ecf67 | 1025 | #endif /* CONFIG_MAC80211_DEBUG */ |
76ee65bf | 1026 | return -EACCES; |
571ecf67 JB |
1027 | } |
1028 | ||
76ee65bf | 1029 | return 0; |
571ecf67 JB |
1030 | } |
1031 | ||
76ee65bf | 1032 | static int |
ce3edf6d | 1033 | ieee80211_drop_unencrypted(struct ieee80211_txrx_data *rx) |
571ecf67 | 1034 | { |
3017b80b | 1035 | /* |
7848ba7d JB |
1036 | * Pass through unencrypted frames if the hardware has |
1037 | * decrypted them already. | |
3017b80b | 1038 | */ |
7848ba7d | 1039 | if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1040 | return 0; |
571ecf67 JB |
1041 | |
1042 | /* Drop unencrypted frames if key is set. */ | |
1043 | if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) && | |
1044 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
1045 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC && | |
ce3edf6d | 1046 | (rx->key || rx->sdata->drop_unencrypted))) { |
1a84f3fd JB |
1047 | if (net_ratelimit()) |
1048 | printk(KERN_DEBUG "%s: RX non-WEP frame, but expected " | |
1049 | "encryption\n", rx->dev->name); | |
76ee65bf | 1050 | return -EACCES; |
571ecf67 | 1051 | } |
76ee65bf | 1052 | return 0; |
571ecf67 JB |
1053 | } |
1054 | ||
76ee65bf RR |
1055 | static int |
1056 | ieee80211_data_to_8023(struct ieee80211_txrx_data *rx) | |
571ecf67 JB |
1057 | { |
1058 | struct net_device *dev = rx->dev; | |
571ecf67 JB |
1059 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; |
1060 | u16 fc, hdrlen, ethertype; | |
1061 | u8 *payload; | |
1062 | u8 dst[ETH_ALEN]; | |
1063 | u8 src[ETH_ALEN]; | |
76ee65bf | 1064 | struct sk_buff *skb = rx->skb; |
571ecf67 | 1065 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
0795af57 JP |
1066 | DECLARE_MAC_BUF(mac); |
1067 | DECLARE_MAC_BUF(mac2); | |
1068 | DECLARE_MAC_BUF(mac3); | |
1069 | DECLARE_MAC_BUF(mac4); | |
571ecf67 JB |
1070 | |
1071 | fc = rx->fc; | |
571ecf67 JB |
1072 | |
1073 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
76ee65bf | 1074 | return -1; |
571ecf67 JB |
1075 | |
1076 | hdrlen = ieee80211_get_hdrlen(fc); | |
1077 | ||
1078 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
1079 | * header | |
1080 | * IEEE 802.11 address fields: | |
1081 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
1082 | * 0 0 DA SA BSSID n/a | |
1083 | * 0 1 DA BSSID SA n/a | |
1084 | * 1 0 BSSID SA DA n/a | |
1085 | * 1 1 RA TA DA SA | |
1086 | */ | |
1087 | ||
1088 | switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
1089 | case IEEE80211_FCTL_TODS: | |
1090 | /* BSSID SA DA */ | |
1091 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1092 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1093 | ||
51fb61e7 JB |
1094 | if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP && |
1095 | sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) { | |
1a84f3fd JB |
1096 | if (net_ratelimit()) |
1097 | printk(KERN_DEBUG "%s: dropped ToDS frame " | |
0795af57 | 1098 | "(BSSID=%s SA=%s DA=%s)\n", |
1a84f3fd | 1099 | dev->name, |
0795af57 JP |
1100 | print_mac(mac, hdr->addr1), |
1101 | print_mac(mac2, hdr->addr2), | |
1102 | print_mac(mac3, hdr->addr3)); | |
76ee65bf | 1103 | return -1; |
571ecf67 JB |
1104 | } |
1105 | break; | |
1106 | case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
1107 | /* RA TA DA SA */ | |
1108 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1109 | memcpy(src, hdr->addr4, ETH_ALEN); | |
1110 | ||
51fb61e7 | 1111 | if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS)) { |
1a84f3fd JB |
1112 | if (net_ratelimit()) |
1113 | printk(KERN_DEBUG "%s: dropped FromDS&ToDS " | |
0795af57 | 1114 | "frame (RA=%s TA=%s DA=%s SA=%s)\n", |
1a84f3fd | 1115 | rx->dev->name, |
0795af57 JP |
1116 | print_mac(mac, hdr->addr1), |
1117 | print_mac(mac2, hdr->addr2), | |
1118 | print_mac(mac3, hdr->addr3), | |
1119 | print_mac(mac4, hdr->addr4)); | |
76ee65bf | 1120 | return -1; |
571ecf67 JB |
1121 | } |
1122 | break; | |
1123 | case IEEE80211_FCTL_FROMDS: | |
1124 | /* DA BSSID SA */ | |
1125 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1126 | memcpy(src, hdr->addr3, ETH_ALEN); | |
1127 | ||
51fb61e7 | 1128 | if (sdata->vif.type != IEEE80211_IF_TYPE_STA || |
b3316157 JL |
1129 | (is_multicast_ether_addr(dst) && |
1130 | !compare_ether_addr(src, dev->dev_addr))) | |
76ee65bf | 1131 | return -1; |
571ecf67 JB |
1132 | break; |
1133 | case 0: | |
1134 | /* DA SA BSSID */ | |
1135 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1136 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1137 | ||
51fb61e7 | 1138 | if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS) { |
571ecf67 | 1139 | if (net_ratelimit()) { |
0795af57 JP |
1140 | printk(KERN_DEBUG "%s: dropped IBSS frame " |
1141 | "(DA=%s SA=%s BSSID=%s)\n", | |
1142 | dev->name, | |
1143 | print_mac(mac, hdr->addr1), | |
1144 | print_mac(mac2, hdr->addr2), | |
1145 | print_mac(mac3, hdr->addr3)); | |
571ecf67 | 1146 | } |
76ee65bf | 1147 | return -1; |
571ecf67 JB |
1148 | } |
1149 | break; | |
1150 | } | |
1151 | ||
571ecf67 JB |
1152 | if (unlikely(skb->len - hdrlen < 8)) { |
1153 | if (net_ratelimit()) { | |
1154 | printk(KERN_DEBUG "%s: RX too short data frame " | |
1155 | "payload\n", dev->name); | |
1156 | } | |
76ee65bf | 1157 | return -1; |
571ecf67 JB |
1158 | } |
1159 | ||
76ee65bf | 1160 | payload = skb->data + hdrlen; |
571ecf67 JB |
1161 | ethertype = (payload[6] << 8) | payload[7]; |
1162 | ||
1163 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1164 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1165 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1166 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1167 | * replace EtherType */ | |
1168 | skb_pull(skb, hdrlen + 6); | |
1169 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1170 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1171 | } else { | |
1172 | struct ethhdr *ehdr; | |
1173 | __be16 len; | |
ce3edf6d | 1174 | |
571ecf67 JB |
1175 | skb_pull(skb, hdrlen); |
1176 | len = htons(skb->len); | |
1177 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1178 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1179 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1180 | ehdr->h_proto = len; | |
1181 | } | |
76ee65bf RR |
1182 | return 0; |
1183 | } | |
571ecf67 | 1184 | |
ce3edf6d JB |
1185 | /* |
1186 | * requires that rx->skb is a frame with ethernet header | |
1187 | */ | |
1188 | static bool ieee80211_frame_allowed(struct ieee80211_txrx_data *rx) | |
1189 | { | |
1190 | static const u8 pae_group_addr[ETH_ALEN] | |
1191 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; | |
1192 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1193 | ||
1194 | /* | |
1195 | * Allow EAPOL frames to us/the PAE group address regardless | |
1196 | * of whether the frame was encrypted or not. | |
1197 | */ | |
1198 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1199 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1200 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1201 | return true; | |
1202 | ||
1203 | if (ieee80211_802_1x_port_control(rx) || | |
1204 | ieee80211_drop_unencrypted(rx)) | |
1205 | return false; | |
1206 | ||
1207 | return true; | |
1208 | } | |
1209 | ||
1210 | /* | |
1211 | * requires that rx->skb is a frame with ethernet header | |
1212 | */ | |
76ee65bf RR |
1213 | static void |
1214 | ieee80211_deliver_skb(struct ieee80211_txrx_data *rx) | |
1215 | { | |
1216 | struct net_device *dev = rx->dev; | |
1217 | struct ieee80211_local *local = rx->local; | |
1218 | struct sk_buff *skb, *xmit_skb; | |
1219 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1220 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1221 | struct sta_info *dsta; | |
571ecf67 | 1222 | |
76ee65bf RR |
1223 | skb = rx->skb; |
1224 | xmit_skb = NULL; | |
571ecf67 | 1225 | |
51fb61e7 JB |
1226 | if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP || |
1227 | sdata->vif.type == IEEE80211_IF_TYPE_VLAN) && | |
badffb72 | 1228 | (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) { |
ce3edf6d JB |
1229 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1230 | /* | |
1231 | * send multicast frames both to higher layers in | |
1232 | * local net stack and back to the wireless medium | |
1233 | */ | |
76ee65bf RR |
1234 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1235 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1236 | printk(KERN_DEBUG "%s: failed to clone " |
1237 | "multicast frame\n", dev->name); | |
1238 | } else { | |
571ecf67 | 1239 | dsta = sta_info_get(local, skb->data); |
ce3edf6d JB |
1240 | if (dsta && dsta->dev == dev) { |
1241 | /* | |
1242 | * The destination station is associated to | |
1243 | * this AP (in this VLAN), so send the frame | |
1244 | * directly to it and do not pass it to local | |
1245 | * net stack. | |
571ecf67 | 1246 | */ |
76ee65bf | 1247 | xmit_skb = skb; |
571ecf67 JB |
1248 | skb = NULL; |
1249 | } | |
1250 | if (dsta) | |
1251 | sta_info_put(dsta); | |
1252 | } | |
1253 | } | |
1254 | ||
1255 | if (skb) { | |
1256 | /* deliver to local stack */ | |
1257 | skb->protocol = eth_type_trans(skb, dev); | |
1258 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1259 | netif_rx(skb); | |
1260 | } | |
1261 | ||
76ee65bf | 1262 | if (xmit_skb) { |
571ecf67 | 1263 | /* send to wireless media */ |
f831e909 | 1264 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1265 | skb_reset_network_header(xmit_skb); |
1266 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1267 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1268 | } |
76ee65bf RR |
1269 | } |
1270 | ||
fd4c7f2f RR |
1271 | static ieee80211_txrx_result |
1272 | ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx) | |
1273 | { | |
1274 | struct net_device *dev = rx->dev; | |
1275 | struct ieee80211_local *local = rx->local; | |
1276 | u16 fc, ethertype; | |
1277 | u8 *payload; | |
1278 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
1279 | const struct ethhdr *eth; | |
1280 | int remaining, err; | |
1281 | u8 dst[ETH_ALEN]; | |
1282 | u8 src[ETH_ALEN]; | |
1283 | DECLARE_MAC_BUF(mac); | |
1284 | ||
1285 | fc = rx->fc; | |
1286 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
1287 | return TXRX_CONTINUE; | |
1288 | ||
1289 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
1290 | return TXRX_DROP; | |
1291 | ||
64bd4b69 | 1292 | if (!(rx->flags & IEEE80211_TXRXD_RX_AMSDU)) |
fd4c7f2f RR |
1293 | return TXRX_CONTINUE; |
1294 | ||
1295 | err = ieee80211_data_to_8023(rx); | |
1296 | if (unlikely(err)) | |
1297 | return TXRX_DROP; | |
1298 | ||
1299 | skb->dev = dev; | |
1300 | ||
1301 | dev->stats.rx_packets++; | |
1302 | dev->stats.rx_bytes += skb->len; | |
1303 | ||
1304 | /* skip the wrapping header */ | |
1305 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1306 | if (!eth) | |
1307 | return TXRX_DROP; | |
1308 | ||
1309 | while (skb != frame) { | |
1310 | u8 padding; | |
1311 | __be16 len = eth->h_proto; | |
1312 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1313 | ||
1314 | remaining = skb->len; | |
1315 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1316 | memcpy(src, eth->h_source, ETH_ALEN); | |
1317 | ||
1318 | padding = ((4 - subframe_len) & 0x3); | |
1319 | /* the last MSDU has no padding */ | |
1320 | if (subframe_len > remaining) { | |
1321 | printk(KERN_DEBUG "%s: wrong buffer size", dev->name); | |
1322 | return TXRX_DROP; | |
1323 | } | |
1324 | ||
1325 | skb_pull(skb, sizeof(struct ethhdr)); | |
1326 | /* if last subframe reuse skb */ | |
1327 | if (remaining <= subframe_len + padding) | |
1328 | frame = skb; | |
1329 | else { | |
1330 | frame = dev_alloc_skb(local->hw.extra_tx_headroom + | |
1331 | subframe_len); | |
1332 | ||
1333 | if (frame == NULL) | |
1334 | return TXRX_DROP; | |
1335 | ||
1336 | skb_reserve(frame, local->hw.extra_tx_headroom + | |
1337 | sizeof(struct ethhdr)); | |
1338 | memcpy(skb_put(frame, ntohs(len)), skb->data, | |
1339 | ntohs(len)); | |
1340 | ||
1341 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1342 | padding); | |
1343 | if (!eth) { | |
1344 | printk(KERN_DEBUG "%s: wrong buffer size ", | |
1345 | dev->name); | |
1346 | dev_kfree_skb(frame); | |
1347 | return TXRX_DROP; | |
1348 | } | |
1349 | } | |
1350 | ||
ce3edf6d | 1351 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1352 | frame->dev = dev; |
1353 | frame->priority = skb->priority; | |
1354 | rx->skb = frame; | |
1355 | ||
fd4c7f2f RR |
1356 | payload = frame->data; |
1357 | ethertype = (payload[6] << 8) | payload[7]; | |
1358 | ||
1359 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1360 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1361 | compare_ether_addr(payload, | |
1362 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1363 | /* remove RFC1042 or Bridge-Tunnel |
1364 | * encapsulation and replace EtherType */ | |
1365 | skb_pull(frame, 6); | |
1366 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1367 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1368 | } else { | |
ce3edf6d JB |
1369 | memcpy(skb_push(frame, sizeof(__be16)), |
1370 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1371 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1372 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1373 | } | |
1374 | ||
ce3edf6d JB |
1375 | if (!ieee80211_frame_allowed(rx)) { |
1376 | if (skb == frame) /* last frame */ | |
1377 | return TXRX_DROP; | |
1378 | dev_kfree_skb(frame); | |
1379 | continue; | |
1380 | } | |
fd4c7f2f RR |
1381 | |
1382 | ieee80211_deliver_skb(rx); | |
1383 | } | |
1384 | ||
1385 | return TXRX_QUEUED; | |
1386 | } | |
1387 | ||
76ee65bf RR |
1388 | static ieee80211_txrx_result |
1389 | ieee80211_rx_h_data(struct ieee80211_txrx_data *rx) | |
1390 | { | |
1391 | struct net_device *dev = rx->dev; | |
1392 | u16 fc; | |
ce3edf6d | 1393 | int err; |
76ee65bf RR |
1394 | |
1395 | fc = rx->fc; | |
1396 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
1397 | return TXRX_CONTINUE; | |
1398 | ||
1399 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
1400 | return TXRX_DROP; | |
1401 | ||
76ee65bf RR |
1402 | err = ieee80211_data_to_8023(rx); |
1403 | if (unlikely(err)) | |
1404 | return TXRX_DROP; | |
1405 | ||
ce3edf6d JB |
1406 | if (!ieee80211_frame_allowed(rx)) |
1407 | return TXRX_DROP; | |
1408 | ||
76ee65bf RR |
1409 | rx->skb->dev = dev; |
1410 | ||
1411 | dev->stats.rx_packets++; | |
1412 | dev->stats.rx_bytes += rx->skb->len; | |
1413 | ||
1414 | ieee80211_deliver_skb(rx); | |
571ecf67 JB |
1415 | |
1416 | return TXRX_QUEUED; | |
1417 | } | |
1418 | ||
71364716 RR |
1419 | static ieee80211_txrx_result |
1420 | ieee80211_rx_h_ctrl(struct ieee80211_txrx_data *rx) | |
1421 | { | |
1422 | struct ieee80211_local *local = rx->local; | |
1423 | struct ieee80211_hw *hw = &local->hw; | |
1424 | struct sk_buff *skb = rx->skb; | |
1425 | struct ieee80211_bar *bar = (struct ieee80211_bar *) skb->data; | |
1426 | struct tid_ampdu_rx *tid_agg_rx; | |
1427 | u16 start_seq_num; | |
1428 | u16 tid; | |
1429 | ||
1430 | if (likely((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL)) | |
1431 | return TXRX_CONTINUE; | |
1432 | ||
1433 | if ((rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BACK_REQ) { | |
1434 | if (!rx->sta) | |
1435 | return TXRX_CONTINUE; | |
1436 | tid = le16_to_cpu(bar->control) >> 12; | |
1437 | tid_agg_rx = &(rx->sta->ampdu_mlme.tid_rx[tid]); | |
1438 | if (tid_agg_rx->state != HT_AGG_STATE_OPERATIONAL) | |
1439 | return TXRX_CONTINUE; | |
1440 | ||
1441 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1442 | ||
1443 | /* reset session timer */ | |
1444 | if (tid_agg_rx->timeout) { | |
1445 | unsigned long expires = | |
1446 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
1447 | mod_timer(&tid_agg_rx->session_timer, expires); | |
1448 | } | |
1449 | ||
1450 | /* manage reordering buffer according to requested */ | |
1451 | /* sequence number */ | |
1452 | rcu_read_lock(); | |
1453 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, | |
1454 | start_seq_num, 1); | |
1455 | rcu_read_unlock(); | |
1456 | return TXRX_DROP; | |
1457 | } | |
1458 | ||
1459 | return TXRX_CONTINUE; | |
1460 | } | |
1461 | ||
571ecf67 JB |
1462 | static ieee80211_txrx_result |
1463 | ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx) | |
1464 | { | |
1465 | struct ieee80211_sub_if_data *sdata; | |
1466 | ||
badffb72 | 1467 | if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) |
571ecf67 JB |
1468 | return TXRX_DROP; |
1469 | ||
1470 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
51fb61e7 JB |
1471 | if ((sdata->vif.type == IEEE80211_IF_TYPE_STA || |
1472 | sdata->vif.type == IEEE80211_IF_TYPE_IBSS) && | |
ddd3d2be | 1473 | !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)) |
571ecf67 | 1474 | ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status); |
f9d540ee JB |
1475 | else |
1476 | return TXRX_DROP; | |
1477 | ||
571ecf67 JB |
1478 | return TXRX_QUEUED; |
1479 | } | |
1480 | ||
1481 | static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers( | |
1482 | struct ieee80211_local *local, | |
1483 | ieee80211_rx_handler *handlers, | |
1484 | struct ieee80211_txrx_data *rx, | |
1485 | struct sta_info *sta) | |
1486 | { | |
1487 | ieee80211_rx_handler *handler; | |
1488 | ieee80211_txrx_result res = TXRX_DROP; | |
1489 | ||
1490 | for (handler = handlers; *handler != NULL; handler++) { | |
1491 | res = (*handler)(rx); | |
8e6f0032 JB |
1492 | |
1493 | switch (res) { | |
1494 | case TXRX_CONTINUE: | |
1495 | continue; | |
1496 | case TXRX_DROP: | |
1497 | I802_DEBUG_INC(local->rx_handlers_drop); | |
1498 | if (sta) | |
1499 | sta->rx_dropped++; | |
1500 | break; | |
1501 | case TXRX_QUEUED: | |
1502 | I802_DEBUG_INC(local->rx_handlers_queued); | |
571ecf67 JB |
1503 | break; |
1504 | } | |
8e6f0032 | 1505 | break; |
571ecf67 JB |
1506 | } |
1507 | ||
8e6f0032 | 1508 | if (res == TXRX_DROP) |
571ecf67 | 1509 | dev_kfree_skb(rx->skb); |
571ecf67 JB |
1510 | return res; |
1511 | } | |
1512 | ||
1513 | static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local, | |
1514 | ieee80211_rx_handler *handlers, | |
1515 | struct ieee80211_txrx_data *rx, | |
1516 | struct sta_info *sta) | |
1517 | { | |
1518 | if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) == | |
1519 | TXRX_CONTINUE) | |
1520 | dev_kfree_skb(rx->skb); | |
1521 | } | |
1522 | ||
1523 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, | |
1524 | struct ieee80211_hdr *hdr, | |
1525 | struct sta_info *sta, | |
1526 | struct ieee80211_txrx_data *rx) | |
1527 | { | |
1528 | int keyidx, hdrlen; | |
0795af57 JP |
1529 | DECLARE_MAC_BUF(mac); |
1530 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
1531 | |
1532 | hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb); | |
1533 | if (rx->skb->len >= hdrlen + 4) | |
1534 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1535 | else | |
1536 | keyidx = -1; | |
1537 | ||
1a84f3fd JB |
1538 | if (net_ratelimit()) |
1539 | printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC " | |
0795af57 JP |
1540 | "failure from %s to %s keyidx=%d\n", |
1541 | dev->name, print_mac(mac, hdr->addr2), | |
1542 | print_mac(mac2, hdr->addr1), keyidx); | |
571ecf67 JB |
1543 | |
1544 | if (!sta) { | |
aa0daf0e JB |
1545 | /* |
1546 | * Some hardware seem to generate incorrect Michael MIC | |
1547 | * reports; ignore them to avoid triggering countermeasures. | |
1548 | */ | |
1a84f3fd JB |
1549 | if (net_ratelimit()) |
1550 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
0795af57 JP |
1551 | "error for unknown address %s\n", |
1552 | dev->name, print_mac(mac, hdr->addr2)); | |
571ecf67 JB |
1553 | goto ignore; |
1554 | } | |
1555 | ||
1556 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) { | |
1a84f3fd JB |
1557 | if (net_ratelimit()) |
1558 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
aa0daf0e | 1559 | "error for a frame with no PROTECTED flag (src " |
0795af57 | 1560 | "%s)\n", dev->name, print_mac(mac, hdr->addr2)); |
571ecf67 JB |
1561 | goto ignore; |
1562 | } | |
1563 | ||
51fb61e7 | 1564 | if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) { |
aa0daf0e JB |
1565 | /* |
1566 | * APs with pairwise keys should never receive Michael MIC | |
1567 | * errors for non-zero keyidx because these are reserved for | |
1568 | * group keys and only the AP is sending real multicast | |
1569 | * frames in the BSS. | |
1570 | */ | |
eb063c17 JB |
1571 | if (net_ratelimit()) |
1572 | printk(KERN_DEBUG "%s: ignored Michael MIC error for " | |
1573 | "a frame with non-zero keyidx (%d)" | |
0795af57 JP |
1574 | " (src %s)\n", dev->name, keyidx, |
1575 | print_mac(mac, hdr->addr2)); | |
eb063c17 | 1576 | goto ignore; |
571ecf67 JB |
1577 | } |
1578 | ||
1579 | if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA && | |
1580 | ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || | |
1581 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) { | |
1a84f3fd JB |
1582 | if (net_ratelimit()) |
1583 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
1584 | "error for a frame that cannot be encrypted " | |
0795af57 JP |
1585 | "(fc=0x%04x) (src %s)\n", |
1586 | dev->name, rx->fc, print_mac(mac, hdr->addr2)); | |
571ecf67 JB |
1587 | goto ignore; |
1588 | } | |
1589 | ||
eb063c17 | 1590 | mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr); |
571ecf67 JB |
1591 | ignore: |
1592 | dev_kfree_skb(rx->skb); | |
1593 | rx->skb = NULL; | |
1594 | } | |
1595 | ||
1596 | ieee80211_rx_handler ieee80211_rx_handlers[] = | |
1597 | { | |
1598 | ieee80211_rx_h_if_stats, | |
571ecf67 JB |
1599 | ieee80211_rx_h_passive_scan, |
1600 | ieee80211_rx_h_check, | |
4f0d18e2 | 1601 | ieee80211_rx_h_decrypt, |
70f08765 | 1602 | ieee80211_rx_h_sta_process, |
571ecf67 JB |
1603 | ieee80211_rx_h_defragment, |
1604 | ieee80211_rx_h_ps_poll, | |
1605 | ieee80211_rx_h_michael_mic_verify, | |
1606 | /* this must be after decryption - so header is counted in MPDU mic | |
1607 | * must be before pae and data, so QOS_DATA format frames | |
1608 | * are not passed to user space by these functions | |
1609 | */ | |
1610 | ieee80211_rx_h_remove_qos_control, | |
fd4c7f2f | 1611 | ieee80211_rx_h_amsdu, |
571ecf67 | 1612 | ieee80211_rx_h_data, |
71364716 | 1613 | ieee80211_rx_h_ctrl, |
571ecf67 JB |
1614 | ieee80211_rx_h_mgmt, |
1615 | NULL | |
1616 | }; | |
1617 | ||
1618 | /* main receive path */ | |
1619 | ||
23a24def JB |
1620 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
1621 | u8 *bssid, struct ieee80211_txrx_data *rx, | |
1622 | struct ieee80211_hdr *hdr) | |
1623 | { | |
1624 | int multicast = is_multicast_ether_addr(hdr->addr1); | |
1625 | ||
51fb61e7 | 1626 | switch (sdata->vif.type) { |
23a24def JB |
1627 | case IEEE80211_IF_TYPE_STA: |
1628 | if (!bssid) | |
1629 | return 0; | |
1630 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
badffb72 | 1631 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1632 | return 0; |
badffb72 | 1633 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1634 | } else if (!multicast && |
1635 | compare_ether_addr(sdata->dev->dev_addr, | |
1636 | hdr->addr1) != 0) { | |
4150c572 | 1637 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1638 | return 0; |
badffb72 | 1639 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1640 | } |
1641 | break; | |
1642 | case IEEE80211_IF_TYPE_IBSS: | |
1643 | if (!bssid) | |
1644 | return 0; | |
1645 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
badffb72 | 1646 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1647 | return 0; |
badffb72 | 1648 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1649 | } else if (!multicast && |
1650 | compare_ether_addr(sdata->dev->dev_addr, | |
1651 | hdr->addr1) != 0) { | |
4150c572 | 1652 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1653 | return 0; |
badffb72 | 1654 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def JB |
1655 | } else if (!rx->sta) |
1656 | rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb, | |
1657 | bssid, hdr->addr2); | |
1658 | break; | |
fb1c1cd6 | 1659 | case IEEE80211_IF_TYPE_VLAN: |
23a24def JB |
1660 | case IEEE80211_IF_TYPE_AP: |
1661 | if (!bssid) { | |
1662 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1663 | hdr->addr1)) | |
1664 | return 0; | |
1665 | } else if (!ieee80211_bssid_match(bssid, | |
1666 | sdata->dev->dev_addr)) { | |
badffb72 | 1667 | if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) |
23a24def | 1668 | return 0; |
badffb72 | 1669 | rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH; |
23a24def | 1670 | } |
badffb72 JS |
1671 | if (sdata->dev == sdata->local->mdev && |
1672 | !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) | |
23a24def JB |
1673 | /* do not receive anything via |
1674 | * master device when not scanning */ | |
1675 | return 0; | |
1676 | break; | |
1677 | case IEEE80211_IF_TYPE_WDS: | |
1678 | if (bssid || | |
1679 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) | |
1680 | return 0; | |
1681 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
1682 | return 0; | |
1683 | break; | |
fb1c1cd6 JB |
1684 | case IEEE80211_IF_TYPE_MNTR: |
1685 | /* take everything */ | |
1686 | break; | |
a2897552 | 1687 | case IEEE80211_IF_TYPE_INVALID: |
fb1c1cd6 JB |
1688 | /* should never get here */ |
1689 | WARN_ON(1); | |
1690 | break; | |
23a24def JB |
1691 | } |
1692 | ||
1693 | return 1; | |
1694 | } | |
1695 | ||
571ecf67 | 1696 | /* |
6368e4b1 RR |
1697 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
1698 | * be called with rcu_read_lock protection. | |
571ecf67 | 1699 | */ |
71ebb4aa RR |
1700 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
1701 | struct sk_buff *skb, | |
1702 | struct ieee80211_rx_status *status, | |
1703 | u32 load) | |
571ecf67 JB |
1704 | { |
1705 | struct ieee80211_local *local = hw_to_local(hw); | |
1706 | struct ieee80211_sub_if_data *sdata; | |
1707 | struct sta_info *sta; | |
1708 | struct ieee80211_hdr *hdr; | |
1709 | struct ieee80211_txrx_data rx; | |
1710 | u16 type; | |
6368e4b1 | 1711 | int prepares; |
8e6f0032 JB |
1712 | struct ieee80211_sub_if_data *prev = NULL; |
1713 | struct sk_buff *skb_new; | |
1714 | u8 *bssid; | |
571ecf67 JB |
1715 | |
1716 | hdr = (struct ieee80211_hdr *) skb->data; | |
1717 | memset(&rx, 0, sizeof(rx)); | |
1718 | rx.skb = skb; | |
1719 | rx.local = local; | |
1720 | ||
1721 | rx.u.rx.status = status; | |
6368e4b1 | 1722 | rx.u.rx.load = load; |
b2e7771e | 1723 | rx.fc = le16_to_cpu(hdr->frame_control); |
571ecf67 | 1724 | type = rx.fc & IEEE80211_FCTL_FTYPE; |
72abd81b | 1725 | |
b2e7771e | 1726 | if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT) |
571ecf67 | 1727 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 1728 | |
b2e7771e JB |
1729 | sta = rx.sta = sta_info_get(local, hdr->addr2); |
1730 | if (sta) { | |
1731 | rx.dev = rx.sta->dev; | |
1732 | rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev); | |
1733 | } | |
571ecf67 | 1734 | |
571ecf67 JB |
1735 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
1736 | ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx); | |
1737 | goto end; | |
1738 | } | |
1739 | ||
ece8eddd | 1740 | if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning)) |
badffb72 | 1741 | rx.flags |= IEEE80211_TXRXD_RXIN_SCAN; |
571ecf67 JB |
1742 | |
1743 | if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx, | |
1744 | sta) != TXRX_CONTINUE) | |
1745 | goto end; | |
1746 | skb = rx.skb; | |
1747 | ||
c9ee23df | 1748 | if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) && |
53918994 JB |
1749 | !atomic_read(&local->iff_promiscs) && |
1750 | !is_multicast_ether_addr(hdr->addr1)) { | |
badffb72 | 1751 | rx.flags |= IEEE80211_TXRXD_RXRA_MATCH; |
571ecf67 | 1752 | ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx, |
23a24def | 1753 | rx.sta); |
8e6f0032 JB |
1754 | sta_info_put(sta); |
1755 | return; | |
1756 | } | |
1757 | ||
79010420 | 1758 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
1759 | if (!netif_running(sdata->dev)) |
1760 | continue; | |
1761 | ||
51fb61e7 | 1762 | if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) |
b2e7771e JB |
1763 | continue; |
1764 | ||
51fb61e7 | 1765 | bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); |
b2e7771e | 1766 | rx.flags |= IEEE80211_TXRXD_RXRA_MATCH; |
6368e4b1 | 1767 | prepares = prepare_for_handlers(sdata, bssid, &rx, hdr); |
23a24def JB |
1768 | /* prepare_for_handlers can change sta */ |
1769 | sta = rx.sta; | |
1770 | ||
6368e4b1 | 1771 | if (!prepares) |
23a24def | 1772 | continue; |
8e6f0032 | 1773 | |
340e11f3 JB |
1774 | /* |
1775 | * frame is destined for this interface, but if it's not | |
1776 | * also for the previous one we handle that after the | |
1777 | * loop to avoid copying the SKB once too much | |
1778 | */ | |
1779 | ||
1780 | if (!prev) { | |
1781 | prev = sdata; | |
1782 | continue; | |
8e6f0032 | 1783 | } |
340e11f3 JB |
1784 | |
1785 | /* | |
1786 | * frame was destined for the previous interface | |
1787 | * so invoke RX handlers for it | |
1788 | */ | |
1789 | ||
1790 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
1791 | if (!skb_new) { | |
1792 | if (net_ratelimit()) | |
1793 | printk(KERN_DEBUG "%s: failed to copy " | |
1794 | "multicast frame for %s", | |
dd1cd4c6 JB |
1795 | wiphy_name(local->hw.wiphy), |
1796 | prev->dev->name); | |
340e11f3 JB |
1797 | continue; |
1798 | } | |
69f817b6 | 1799 | rx.fc = le16_to_cpu(hdr->frame_control); |
340e11f3 JB |
1800 | rx.skb = skb_new; |
1801 | rx.dev = prev->dev; | |
1802 | rx.sdata = prev; | |
1803 | ieee80211_invoke_rx_handlers(local, local->rx_handlers, | |
1804 | &rx, sta); | |
8e6f0032 | 1805 | prev = sdata; |
571ecf67 | 1806 | } |
8e6f0032 | 1807 | if (prev) { |
69f817b6 | 1808 | rx.fc = le16_to_cpu(hdr->frame_control); |
8e6f0032 JB |
1809 | rx.skb = skb; |
1810 | rx.dev = prev->dev; | |
1811 | rx.sdata = prev; | |
1812 | ieee80211_invoke_rx_handlers(local, local->rx_handlers, | |
1813 | &rx, sta); | |
1814 | } else | |
1815 | dev_kfree_skb(skb); | |
571ecf67 | 1816 | |
8e6f0032 | 1817 | end: |
571ecf67 JB |
1818 | if (sta) |
1819 | sta_info_put(sta); | |
1820 | } | |
6368e4b1 | 1821 | |
b580781e RR |
1822 | #define SEQ_MODULO 0x1000 |
1823 | #define SEQ_MASK 0xfff | |
1824 | ||
1825 | static inline int seq_less(u16 sq1, u16 sq2) | |
1826 | { | |
1827 | return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1)); | |
1828 | } | |
1829 | ||
1830 | static inline u16 seq_inc(u16 sq) | |
1831 | { | |
1832 | return ((sq + 1) & SEQ_MASK); | |
1833 | } | |
1834 | ||
1835 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
1836 | { | |
1837 | return ((sq1 - sq2) & SEQ_MASK); | |
1838 | } | |
1839 | ||
1840 | ||
71364716 RR |
1841 | /* |
1842 | * As it function blongs to Rx path it must be called with | |
1843 | * the proper rcu_read_lock protection for its flow. | |
1844 | */ | |
b580781e RR |
1845 | u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
1846 | struct tid_ampdu_rx *tid_agg_rx, | |
1847 | struct sk_buff *skb, u16 mpdu_seq_num, | |
1848 | int bar_req) | |
1849 | { | |
1850 | struct ieee80211_local *local = hw_to_local(hw); | |
1851 | struct ieee80211_rx_status status; | |
1852 | u16 head_seq_num, buf_size; | |
1853 | int index; | |
1854 | u32 pkt_load; | |
1855 | ||
1856 | buf_size = tid_agg_rx->buf_size; | |
1857 | head_seq_num = tid_agg_rx->head_seq_num; | |
1858 | ||
1859 | /* frame with out of date sequence number */ | |
1860 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
1861 | dev_kfree_skb(skb); | |
1862 | return 1; | |
1863 | } | |
1864 | ||
1865 | /* if frame sequence number exceeds our buffering window size or | |
1866 | * block Ack Request arrived - release stored frames */ | |
1867 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
1868 | /* new head to the ordering buffer */ | |
1869 | if (bar_req) | |
1870 | head_seq_num = mpdu_seq_num; | |
1871 | else | |
1872 | head_seq_num = | |
1873 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
1874 | /* release stored frames up to new head to stack */ | |
1875 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
1876 | index = seq_sub(tid_agg_rx->head_seq_num, | |
1877 | tid_agg_rx->ssn) | |
1878 | % tid_agg_rx->buf_size; | |
1879 | ||
1880 | if (tid_agg_rx->reorder_buf[index]) { | |
1881 | /* release the reordered frames to stack */ | |
1882 | memcpy(&status, | |
1883 | tid_agg_rx->reorder_buf[index]->cb, | |
1884 | sizeof(status)); | |
1885 | pkt_load = ieee80211_rx_load_stats(local, | |
1886 | tid_agg_rx->reorder_buf[index], | |
1887 | &status); | |
1888 | __ieee80211_rx_handle_packet(hw, | |
1889 | tid_agg_rx->reorder_buf[index], | |
1890 | &status, pkt_load); | |
1891 | tid_agg_rx->stored_mpdu_num--; | |
1892 | tid_agg_rx->reorder_buf[index] = NULL; | |
1893 | } | |
1894 | tid_agg_rx->head_seq_num = | |
1895 | seq_inc(tid_agg_rx->head_seq_num); | |
1896 | } | |
1897 | if (bar_req) | |
1898 | return 1; | |
1899 | } | |
1900 | ||
1901 | /* now the new frame is always in the range of the reordering */ | |
1902 | /* buffer window */ | |
1903 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
1904 | % tid_agg_rx->buf_size; | |
1905 | /* check if we already stored this frame */ | |
1906 | if (tid_agg_rx->reorder_buf[index]) { | |
1907 | dev_kfree_skb(skb); | |
1908 | return 1; | |
1909 | } | |
1910 | ||
1911 | /* if arrived mpdu is in the right order and nothing else stored */ | |
1912 | /* release it immediately */ | |
1913 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
1914 | tid_agg_rx->stored_mpdu_num == 0) { | |
1915 | tid_agg_rx->head_seq_num = | |
1916 | seq_inc(tid_agg_rx->head_seq_num); | |
1917 | return 0; | |
1918 | } | |
1919 | ||
1920 | /* put the frame in the reordering buffer */ | |
1921 | tid_agg_rx->reorder_buf[index] = skb; | |
1922 | tid_agg_rx->stored_mpdu_num++; | |
1923 | /* release the buffer until next missing frame */ | |
1924 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
1925 | % tid_agg_rx->buf_size; | |
1926 | while (tid_agg_rx->reorder_buf[index]) { | |
1927 | /* release the reordered frame back to stack */ | |
1928 | memcpy(&status, tid_agg_rx->reorder_buf[index]->cb, | |
1929 | sizeof(status)); | |
1930 | pkt_load = ieee80211_rx_load_stats(local, | |
1931 | tid_agg_rx->reorder_buf[index], | |
1932 | &status); | |
1933 | __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index], | |
1934 | &status, pkt_load); | |
1935 | tid_agg_rx->stored_mpdu_num--; | |
1936 | tid_agg_rx->reorder_buf[index] = NULL; | |
1937 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
1938 | index = seq_sub(tid_agg_rx->head_seq_num, | |
1939 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
1940 | } | |
1941 | return 1; | |
1942 | } | |
1943 | ||
71ebb4aa RR |
1944 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
1945 | struct sk_buff *skb) | |
b580781e RR |
1946 | { |
1947 | struct ieee80211_hw *hw = &local->hw; | |
1948 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1949 | struct sta_info *sta; | |
1950 | struct tid_ampdu_rx *tid_agg_rx; | |
1951 | u16 fc, sc; | |
1952 | u16 mpdu_seq_num; | |
1953 | u8 ret = 0, *qc; | |
1954 | int tid; | |
1955 | ||
1956 | sta = sta_info_get(local, hdr->addr2); | |
1957 | if (!sta) | |
1958 | return ret; | |
1959 | ||
1960 | fc = le16_to_cpu(hdr->frame_control); | |
1961 | ||
1962 | /* filter the QoS data rx stream according to | |
1963 | * STA/TID and check if this STA/TID is on aggregation */ | |
1964 | if (!WLAN_FC_IS_QOS_DATA(fc)) | |
1965 | goto end_reorder; | |
1966 | ||
1967 | qc = skb->data + ieee80211_get_hdrlen(fc) - QOS_CONTROL_LEN; | |
1968 | tid = qc[0] & QOS_CONTROL_TID_MASK; | |
1969 | tid_agg_rx = &(sta->ampdu_mlme.tid_rx[tid]); | |
1970 | ||
1971 | if (tid_agg_rx->state != HT_AGG_STATE_OPERATIONAL) | |
1972 | goto end_reorder; | |
1973 | ||
1974 | /* null data frames are excluded */ | |
1975 | if (unlikely(fc & IEEE80211_STYPE_QOS_NULLFUNC)) | |
1976 | goto end_reorder; | |
1977 | ||
1978 | /* new un-ordered ampdu frame - process it */ | |
1979 | ||
1980 | /* reset session timer */ | |
1981 | if (tid_agg_rx->timeout) { | |
1982 | unsigned long expires = | |
1983 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
1984 | mod_timer(&tid_agg_rx->session_timer, expires); | |
1985 | } | |
1986 | ||
1987 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
1988 | sc = le16_to_cpu(hdr->seq_ctrl); | |
1989 | if (sc & IEEE80211_SCTL_FRAG) { | |
1990 | ieee80211_sta_stop_rx_ba_session(sta->dev, sta->addr, | |
1991 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); | |
1992 | ret = 1; | |
1993 | goto end_reorder; | |
1994 | } | |
1995 | ||
1996 | /* according to mpdu sequence number deal with reordering buffer */ | |
1997 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
1998 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, | |
1999 | mpdu_seq_num, 0); | |
2000 | end_reorder: | |
2001 | if (sta) | |
2002 | sta_info_put(sta); | |
2003 | return ret; | |
2004 | } | |
2005 | ||
6368e4b1 RR |
2006 | /* |
2007 | * This is the receive path handler. It is called by a low level driver when an | |
2008 | * 802.11 MPDU is received from the hardware. | |
2009 | */ | |
2010 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2011 | struct ieee80211_rx_status *status) | |
2012 | { | |
2013 | struct ieee80211_local *local = hw_to_local(hw); | |
2014 | u32 pkt_load; | |
2015 | ||
2016 | /* | |
2017 | * key references and virtual interfaces are protected using RCU | |
2018 | * and this requires that we are in a read-side RCU section during | |
2019 | * receive processing | |
2020 | */ | |
2021 | rcu_read_lock(); | |
2022 | ||
2023 | /* | |
2024 | * Frames with failed FCS/PLCP checksum are not returned, | |
2025 | * all other frames are returned without radiotap header | |
2026 | * if it was previously present. | |
2027 | * Also, frames with less than 16 bytes are dropped. | |
2028 | */ | |
2029 | skb = ieee80211_rx_monitor(local, skb, status); | |
2030 | if (!skb) { | |
2031 | rcu_read_unlock(); | |
2032 | return; | |
2033 | } | |
2034 | ||
2035 | pkt_load = ieee80211_rx_load_stats(local, skb, status); | |
b580781e | 2036 | local->channel_use_raw += pkt_load; |
6368e4b1 | 2037 | |
b580781e RR |
2038 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
2039 | __ieee80211_rx_handle_packet(hw, skb, status, pkt_load); | |
6368e4b1 RR |
2040 | |
2041 | rcu_read_unlock(); | |
2042 | } | |
571ecf67 JB |
2043 | EXPORT_SYMBOL(__ieee80211_rx); |
2044 | ||
2045 | /* This is a version of the rx handler that can be called from hard irq | |
2046 | * context. Post the skb on the queue and schedule the tasklet */ | |
2047 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2048 | struct ieee80211_rx_status *status) | |
2049 | { | |
2050 | struct ieee80211_local *local = hw_to_local(hw); | |
2051 | ||
2052 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2053 | ||
2054 | skb->dev = local->mdev; | |
2055 | /* copy status into skb->cb for use by tasklet */ | |
2056 | memcpy(skb->cb, status, sizeof(*status)); | |
2057 | skb->pkt_type = IEEE80211_RX_MSG; | |
2058 | skb_queue_tail(&local->skb_queue, skb); | |
2059 | tasklet_schedule(&local->tasklet); | |
2060 | } | |
2061 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |