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