Commit | Line | Data |
---|---|---|
b453872c JG |
1 | /* |
2 | * Original code based Host AP (software wireless LAN access point) driver | |
3 | * for Intersil Prism2/2.5/3 - hostap.o module, common routines | |
4 | * | |
5 | * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen | |
6 | * <jkmaline@cc.hut.fi> | |
7 | * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi> | |
8 | * Copyright (c) 2004, Intel Corporation | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. See README and COPYING for | |
13 | * more details. | |
14 | */ | |
15 | ||
16 | #include <linux/compiler.h> | |
17 | #include <linux/config.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/if_arp.h> | |
20 | #include <linux/in6.h> | |
21 | #include <linux/in.h> | |
22 | #include <linux/ip.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/netdevice.h> | |
b453872c JG |
26 | #include <linux/proc_fs.h> |
27 | #include <linux/skbuff.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/tcp.h> | |
30 | #include <linux/types.h> | |
31 | #include <linux/version.h> | |
32 | #include <linux/wireless.h> | |
33 | #include <linux/etherdevice.h> | |
34 | #include <asm/uaccess.h> | |
35 | #include <linux/ctype.h> | |
36 | ||
37 | #include <net/ieee80211.h> | |
38 | ||
39 | static inline void ieee80211_monitor_rx(struct ieee80211_device *ieee, | |
40 | struct sk_buff *skb, | |
41 | struct ieee80211_rx_stats *rx_stats) | |
42 | { | |
43 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
44 | u16 fc = le16_to_cpu(hdr->frame_ctl); | |
45 | ||
46 | skb->dev = ieee->dev; | |
47 | skb->mac.raw = skb->data; | |
48 | skb_pull(skb, ieee80211_get_hdrlen(fc)); | |
49 | skb->pkt_type = PACKET_OTHERHOST; | |
50 | skb->protocol = __constant_htons(ETH_P_80211_RAW); | |
51 | memset(skb->cb, 0, sizeof(skb->cb)); | |
52 | netif_rx(skb); | |
53 | } | |
54 | ||
b453872c | 55 | /* Called only as a tasklet (software IRQ) */ |
0edd5b44 JG |
56 | static struct ieee80211_frag_entry *ieee80211_frag_cache_find(struct |
57 | ieee80211_device | |
58 | *ieee, | |
59 | unsigned int seq, | |
60 | unsigned int frag, | |
61 | u8 * src, | |
62 | u8 * dst) | |
b453872c JG |
63 | { |
64 | struct ieee80211_frag_entry *entry; | |
65 | int i; | |
66 | ||
67 | for (i = 0; i < IEEE80211_FRAG_CACHE_LEN; i++) { | |
68 | entry = &ieee->frag_cache[i]; | |
69 | if (entry->skb != NULL && | |
70 | time_after(jiffies, entry->first_frag_time + 2 * HZ)) { | |
0edd5b44 JG |
71 | IEEE80211_DEBUG_FRAG("expiring fragment cache entry " |
72 | "seq=%u last_frag=%u\n", | |
73 | entry->seq, entry->last_frag); | |
b453872c JG |
74 | dev_kfree_skb_any(entry->skb); |
75 | entry->skb = NULL; | |
76 | } | |
77 | ||
78 | if (entry->skb != NULL && entry->seq == seq && | |
79 | (entry->last_frag + 1 == frag || frag == -1) && | |
80 | memcmp(entry->src_addr, src, ETH_ALEN) == 0 && | |
81 | memcmp(entry->dst_addr, dst, ETH_ALEN) == 0) | |
82 | return entry; | |
83 | } | |
84 | ||
85 | return NULL; | |
86 | } | |
87 | ||
88 | /* Called only as a tasklet (software IRQ) */ | |
0edd5b44 JG |
89 | static struct sk_buff *ieee80211_frag_cache_get(struct ieee80211_device *ieee, |
90 | struct ieee80211_hdr *hdr) | |
b453872c JG |
91 | { |
92 | struct sk_buff *skb = NULL; | |
93 | u16 sc; | |
94 | unsigned int frag, seq; | |
95 | struct ieee80211_frag_entry *entry; | |
96 | ||
97 | sc = le16_to_cpu(hdr->seq_ctl); | |
98 | frag = WLAN_GET_SEQ_FRAG(sc); | |
99 | seq = WLAN_GET_SEQ_SEQ(sc); | |
100 | ||
101 | if (frag == 0) { | |
102 | /* Reserve enough space to fit maximum frame length */ | |
103 | skb = dev_alloc_skb(ieee->dev->mtu + | |
104 | sizeof(struct ieee80211_hdr) + | |
0edd5b44 JG |
105 | 8 /* LLC */ + |
106 | 2 /* alignment */ + | |
107 | 8 /* WEP */ + ETH_ALEN /* WDS */ ); | |
b453872c JG |
108 | if (skb == NULL) |
109 | return NULL; | |
110 | ||
111 | entry = &ieee->frag_cache[ieee->frag_next_idx]; | |
112 | ieee->frag_next_idx++; | |
113 | if (ieee->frag_next_idx >= IEEE80211_FRAG_CACHE_LEN) | |
114 | ieee->frag_next_idx = 0; | |
115 | ||
116 | if (entry->skb != NULL) | |
117 | dev_kfree_skb_any(entry->skb); | |
118 | ||
119 | entry->first_frag_time = jiffies; | |
120 | entry->seq = seq; | |
121 | entry->last_frag = frag; | |
122 | entry->skb = skb; | |
123 | memcpy(entry->src_addr, hdr->addr2, ETH_ALEN); | |
124 | memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN); | |
125 | } else { | |
126 | /* received a fragment of a frame for which the head fragment | |
127 | * should have already been received */ | |
128 | entry = ieee80211_frag_cache_find(ieee, seq, frag, hdr->addr2, | |
129 | hdr->addr1); | |
130 | if (entry != NULL) { | |
131 | entry->last_frag = frag; | |
132 | skb = entry->skb; | |
133 | } | |
134 | } | |
135 | ||
136 | return skb; | |
137 | } | |
138 | ||
b453872c JG |
139 | /* Called only as a tasklet (software IRQ) */ |
140 | static int ieee80211_frag_cache_invalidate(struct ieee80211_device *ieee, | |
141 | struct ieee80211_hdr *hdr) | |
142 | { | |
143 | u16 sc; | |
144 | unsigned int seq; | |
145 | struct ieee80211_frag_entry *entry; | |
146 | ||
147 | sc = le16_to_cpu(hdr->seq_ctl); | |
148 | seq = WLAN_GET_SEQ_SEQ(sc); | |
149 | ||
150 | entry = ieee80211_frag_cache_find(ieee, seq, -1, hdr->addr2, | |
151 | hdr->addr1); | |
152 | ||
153 | if (entry == NULL) { | |
0edd5b44 JG |
154 | IEEE80211_DEBUG_FRAG("could not invalidate fragment cache " |
155 | "entry (seq=%u)\n", seq); | |
b453872c JG |
156 | return -1; |
157 | } | |
158 | ||
159 | entry->skb = NULL; | |
160 | return 0; | |
161 | } | |
162 | ||
b453872c JG |
163 | #ifdef NOT_YET |
164 | /* ieee80211_rx_frame_mgtmt | |
165 | * | |
166 | * Responsible for handling management control frames | |
167 | * | |
168 | * Called by ieee80211_rx */ | |
169 | static inline int | |
170 | ieee80211_rx_frame_mgmt(struct ieee80211_device *ieee, struct sk_buff *skb, | |
171 | struct ieee80211_rx_stats *rx_stats, u16 type, | |
172 | u16 stype) | |
173 | { | |
174 | if (ieee->iw_mode == IW_MODE_MASTER) { | |
175 | printk(KERN_DEBUG "%s: Master mode not yet suppported.\n", | |
176 | ieee->dev->name); | |
177 | return 0; | |
178 | /* | |
179 | hostap_update_sta_ps(ieee, (struct hostap_ieee80211_hdr *) | |
180 | skb->data);*/ | |
181 | } | |
182 | ||
183 | if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) { | |
184 | if (stype == WLAN_FC_STYPE_BEACON && | |
185 | ieee->iw_mode == IW_MODE_MASTER) { | |
186 | struct sk_buff *skb2; | |
187 | /* Process beacon frames also in kernel driver to | |
188 | * update STA(AP) table statistics */ | |
189 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
190 | if (skb2) | |
191 | hostap_rx(skb2->dev, skb2, rx_stats); | |
192 | } | |
193 | ||
194 | /* send management frames to the user space daemon for | |
195 | * processing */ | |
196 | ieee->apdevstats.rx_packets++; | |
197 | ieee->apdevstats.rx_bytes += skb->len; | |
198 | prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT); | |
199 | return 0; | |
200 | } | |
201 | ||
0edd5b44 | 202 | if (ieee->iw_mode == IW_MODE_MASTER) { |
b453872c JG |
203 | if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) { |
204 | printk(KERN_DEBUG "%s: unknown management frame " | |
205 | "(type=0x%02x, stype=0x%02x) dropped\n", | |
206 | skb->dev->name, type, stype); | |
207 | return -1; | |
208 | } | |
209 | ||
210 | hostap_rx(skb->dev, skb, rx_stats); | |
211 | return 0; | |
212 | } | |
213 | ||
214 | printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame " | |
215 | "received in non-Host AP mode\n", skb->dev->name); | |
216 | return -1; | |
217 | } | |
218 | #endif | |
219 | ||
b453872c JG |
220 | /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ |
221 | /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ | |
0edd5b44 JG |
222 | static unsigned char rfc1042_header[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; |
223 | ||
b453872c JG |
224 | /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ |
225 | static unsigned char bridge_tunnel_header[] = | |
0edd5b44 | 226 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; |
b453872c JG |
227 | /* No encapsulation header if EtherType < 0x600 (=length) */ |
228 | ||
229 | /* Called by ieee80211_rx_frame_decrypt */ | |
230 | static int ieee80211_is_eapol_frame(struct ieee80211_device *ieee, | |
231 | struct sk_buff *skb) | |
232 | { | |
233 | struct net_device *dev = ieee->dev; | |
234 | u16 fc, ethertype; | |
235 | struct ieee80211_hdr *hdr; | |
236 | u8 *pos; | |
237 | ||
238 | if (skb->len < 24) | |
239 | return 0; | |
240 | ||
0edd5b44 | 241 | hdr = (struct ieee80211_hdr *)skb->data; |
b453872c JG |
242 | fc = le16_to_cpu(hdr->frame_ctl); |
243 | ||
244 | /* check that the frame is unicast frame to us */ | |
245 | if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == | |
246 | IEEE80211_FCTL_TODS && | |
247 | memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 && | |
248 | memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) { | |
249 | /* ToDS frame with own addr BSSID and DA */ | |
250 | } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == | |
251 | IEEE80211_FCTL_FROMDS && | |
252 | memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) { | |
253 | /* FromDS frame with own addr as DA */ | |
254 | } else | |
255 | return 0; | |
256 | ||
257 | if (skb->len < 24 + 8) | |
258 | return 0; | |
259 | ||
260 | /* check for port access entity Ethernet type */ | |
261 | pos = skb->data + 24; | |
262 | ethertype = (pos[6] << 8) | pos[7]; | |
263 | if (ethertype == ETH_P_PAE) | |
264 | return 1; | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | /* Called only as a tasklet (software IRQ), by ieee80211_rx */ | |
270 | static inline int | |
0edd5b44 | 271 | ieee80211_rx_frame_decrypt(struct ieee80211_device *ieee, struct sk_buff *skb, |
b453872c JG |
272 | struct ieee80211_crypt_data *crypt) |
273 | { | |
274 | struct ieee80211_hdr *hdr; | |
275 | int res, hdrlen; | |
276 | ||
277 | if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL) | |
278 | return 0; | |
279 | ||
0edd5b44 | 280 | hdr = (struct ieee80211_hdr *)skb->data; |
b453872c JG |
281 | hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl)); |
282 | ||
283 | #ifdef CONFIG_IEEE80211_CRYPT_TKIP | |
0edd5b44 | 284 | if (ieee->tkip_countermeasures && strcmp(crypt->ops->name, "TKIP") == 0) { |
b453872c JG |
285 | if (net_ratelimit()) { |
286 | printk(KERN_DEBUG "%s: TKIP countermeasures: dropped " | |
287 | "received packet from " MAC_FMT "\n", | |
288 | ieee->dev->name, MAC_ARG(hdr->addr2)); | |
289 | } | |
290 | return -1; | |
291 | } | |
292 | #endif | |
293 | ||
294 | atomic_inc(&crypt->refcnt); | |
295 | res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv); | |
296 | atomic_dec(&crypt->refcnt); | |
297 | if (res < 0) { | |
0edd5b44 JG |
298 | IEEE80211_DEBUG_DROP("decryption failed (SA=" MAC_FMT |
299 | ") res=%d\n", MAC_ARG(hdr->addr2), res); | |
b453872c JG |
300 | if (res == -2) |
301 | IEEE80211_DEBUG_DROP("Decryption failed ICV " | |
302 | "mismatch (key %d)\n", | |
303 | skb->data[hdrlen + 3] >> 6); | |
304 | ieee->ieee_stats.rx_discards_undecryptable++; | |
305 | return -1; | |
306 | } | |
307 | ||
308 | return res; | |
309 | } | |
310 | ||
b453872c JG |
311 | /* Called only as a tasklet (software IRQ), by ieee80211_rx */ |
312 | static inline int | |
0edd5b44 JG |
313 | ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device *ieee, |
314 | struct sk_buff *skb, int keyidx, | |
315 | struct ieee80211_crypt_data *crypt) | |
b453872c JG |
316 | { |
317 | struct ieee80211_hdr *hdr; | |
318 | int res, hdrlen; | |
319 | ||
320 | if (crypt == NULL || crypt->ops->decrypt_msdu == NULL) | |
321 | return 0; | |
322 | ||
0edd5b44 | 323 | hdr = (struct ieee80211_hdr *)skb->data; |
b453872c JG |
324 | hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl)); |
325 | ||
326 | atomic_inc(&crypt->refcnt); | |
327 | res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv); | |
328 | atomic_dec(&crypt->refcnt); | |
329 | if (res < 0) { | |
330 | printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed" | |
331 | " (SA=" MAC_FMT " keyidx=%d)\n", | |
332 | ieee->dev->name, MAC_ARG(hdr->addr2), keyidx); | |
333 | return -1; | |
334 | } | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
b453872c JG |
339 | /* All received frames are sent to this function. @skb contains the frame in |
340 | * IEEE 802.11 format, i.e., in the format it was sent over air. | |
341 | * This function is called only as a tasklet (software IRQ). */ | |
342 | int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb, | |
343 | struct ieee80211_rx_stats *rx_stats) | |
344 | { | |
345 | struct net_device *dev = ieee->dev; | |
346 | struct ieee80211_hdr *hdr; | |
347 | size_t hdrlen; | |
348 | u16 fc, type, stype, sc; | |
349 | struct net_device_stats *stats; | |
350 | unsigned int frag; | |
351 | u8 *payload; | |
352 | u16 ethertype; | |
353 | #ifdef NOT_YET | |
354 | struct net_device *wds = NULL; | |
355 | struct sk_buff *skb2 = NULL; | |
356 | struct net_device *wds = NULL; | |
357 | int frame_authorized = 0; | |
358 | int from_assoc_ap = 0; | |
359 | void *sta = NULL; | |
360 | #endif | |
361 | u8 dst[ETH_ALEN]; | |
362 | u8 src[ETH_ALEN]; | |
363 | struct ieee80211_crypt_data *crypt = NULL; | |
364 | int keyidx = 0; | |
365 | ||
366 | hdr = (struct ieee80211_hdr *)skb->data; | |
367 | stats = &ieee->stats; | |
368 | ||
369 | if (skb->len < 10) { | |
0edd5b44 | 370 | printk(KERN_INFO "%s: SKB length < 10\n", dev->name); |
b453872c JG |
371 | goto rx_dropped; |
372 | } | |
373 | ||
374 | fc = le16_to_cpu(hdr->frame_ctl); | |
375 | type = WLAN_FC_GET_TYPE(fc); | |
376 | stype = WLAN_FC_GET_STYPE(fc); | |
377 | sc = le16_to_cpu(hdr->seq_ctl); | |
378 | frag = WLAN_GET_SEQ_FRAG(sc); | |
379 | hdrlen = ieee80211_get_hdrlen(fc); | |
380 | ||
381 | #ifdef NOT_YET | |
382 | #if WIRELESS_EXT > 15 | |
383 | /* Put this code here so that we avoid duplicating it in all | |
384 | * Rx paths. - Jean II */ | |
385 | #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */ | |
386 | /* If spy monitoring on */ | |
387 | if (iface->spy_data.spy_number > 0) { | |
388 | struct iw_quality wstats; | |
389 | wstats.level = rx_stats->signal; | |
390 | wstats.noise = rx_stats->noise; | |
391 | wstats.updated = 6; /* No qual value */ | |
392 | /* Update spy records */ | |
393 | wireless_spy_update(dev, hdr->addr2, &wstats); | |
394 | } | |
0edd5b44 JG |
395 | #endif /* IW_WIRELESS_SPY */ |
396 | #endif /* WIRELESS_EXT > 15 */ | |
b453872c JG |
397 | hostap_update_rx_stats(local->ap, hdr, rx_stats); |
398 | #endif | |
399 | ||
400 | #if WIRELESS_EXT > 15 | |
401 | if (ieee->iw_mode == IW_MODE_MONITOR) { | |
402 | ieee80211_monitor_rx(ieee, skb, rx_stats); | |
403 | stats->rx_packets++; | |
404 | stats->rx_bytes += skb->len; | |
405 | return 1; | |
406 | } | |
407 | #endif | |
408 | ||
409 | if (ieee->host_decrypt) { | |
410 | int idx = 0; | |
411 | if (skb->len >= hdrlen + 3) | |
412 | idx = skb->data[hdrlen + 3] >> 6; | |
413 | crypt = ieee->crypt[idx]; | |
414 | #ifdef NOT_YET | |
415 | sta = NULL; | |
416 | ||
417 | /* Use station specific key to override default keys if the | |
418 | * receiver address is a unicast address ("individual RA"). If | |
419 | * bcrx_sta_key parameter is set, station specific key is used | |
420 | * even with broad/multicast targets (this is against IEEE | |
421 | * 802.11, but makes it easier to use different keys with | |
422 | * stations that do not support WEP key mapping). */ | |
423 | ||
424 | if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key) | |
0edd5b44 JG |
425 | (void)hostap_handle_sta_crypto(local, hdr, &crypt, |
426 | &sta); | |
b453872c JG |
427 | #endif |
428 | ||
429 | /* allow NULL decrypt to indicate an station specific override | |
430 | * for default encryption */ | |
431 | if (crypt && (crypt->ops == NULL || | |
432 | crypt->ops->decrypt_mpdu == NULL)) | |
433 | crypt = NULL; | |
434 | ||
f13baae4 | 435 | if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) { |
b453872c JG |
436 | /* This seems to be triggered by some (multicast?) |
437 | * frames from other than current BSS, so just drop the | |
438 | * frames silently instead of filling system log with | |
439 | * these reports. */ | |
440 | IEEE80211_DEBUG_DROP("Decryption failed (not set)" | |
441 | " (SA=" MAC_FMT ")\n", | |
442 | MAC_ARG(hdr->addr2)); | |
443 | ieee->ieee_stats.rx_discards_undecryptable++; | |
444 | goto rx_dropped; | |
445 | } | |
446 | } | |
b453872c JG |
447 | #ifdef NOT_YET |
448 | if (type != WLAN_FC_TYPE_DATA) { | |
449 | if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH && | |
f13baae4 | 450 | fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt && |
0edd5b44 | 451 | (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) { |
b453872c JG |
452 | printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth " |
453 | "from " MAC_FMT "\n", dev->name, | |
454 | MAC_ARG(hdr->addr2)); | |
455 | /* TODO: could inform hostapd about this so that it | |
456 | * could send auth failure report */ | |
457 | goto rx_dropped; | |
458 | } | |
459 | ||
460 | if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype)) | |
461 | goto rx_dropped; | |
462 | else | |
463 | goto rx_exit; | |
464 | } | |
465 | #endif | |
466 | ||
467 | /* Data frame - extract src/dst addresses */ | |
286d9747 | 468 | if (skb->len < IEEE80211_3ADDR_LEN) |
b453872c JG |
469 | goto rx_dropped; |
470 | ||
471 | switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) { | |
472 | case IEEE80211_FCTL_FROMDS: | |
473 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
474 | memcpy(src, hdr->addr3, ETH_ALEN); | |
475 | break; | |
476 | case IEEE80211_FCTL_TODS: | |
477 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
478 | memcpy(src, hdr->addr2, ETH_ALEN); | |
479 | break; | |
480 | case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS: | |
286d9747 | 481 | if (skb->len < IEEE80211_4ADDR_LEN) |
b453872c JG |
482 | goto rx_dropped; |
483 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
484 | memcpy(src, hdr->addr4, ETH_ALEN); | |
485 | break; | |
486 | case 0: | |
487 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
488 | memcpy(src, hdr->addr2, ETH_ALEN); | |
489 | break; | |
490 | } | |
491 | ||
492 | #ifdef NOT_YET | |
493 | if (hostap_rx_frame_wds(ieee, hdr, fc, &wds)) | |
494 | goto rx_dropped; | |
495 | if (wds) { | |
496 | skb->dev = dev = wds; | |
497 | stats = hostap_get_stats(dev); | |
498 | } | |
499 | ||
500 | if (ieee->iw_mode == IW_MODE_MASTER && !wds && | |
0edd5b44 JG |
501 | (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == |
502 | IEEE80211_FCTL_FROMDS && ieee->stadev | |
503 | && memcmp(hdr->addr2, ieee->assoc_ap_addr, ETH_ALEN) == 0) { | |
b453872c JG |
504 | /* Frame from BSSID of the AP for which we are a client */ |
505 | skb->dev = dev = ieee->stadev; | |
506 | stats = hostap_get_stats(dev); | |
507 | from_assoc_ap = 1; | |
508 | } | |
509 | #endif | |
510 | ||
511 | dev->last_rx = jiffies; | |
512 | ||
513 | #ifdef NOT_YET | |
514 | if ((ieee->iw_mode == IW_MODE_MASTER || | |
0edd5b44 | 515 | ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) { |
b453872c JG |
516 | switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats, |
517 | wds != NULL)) { | |
518 | case AP_RX_CONTINUE_NOT_AUTHORIZED: | |
519 | frame_authorized = 0; | |
520 | break; | |
521 | case AP_RX_CONTINUE: | |
522 | frame_authorized = 1; | |
523 | break; | |
524 | case AP_RX_DROP: | |
525 | goto rx_dropped; | |
526 | case AP_RX_EXIT: | |
527 | goto rx_exit; | |
528 | } | |
529 | } | |
530 | #endif | |
531 | ||
532 | /* Nullfunc frames may have PS-bit set, so they must be passed to | |
533 | * hostap_handle_sta_rx() before being dropped here. */ | |
534 | if (stype != IEEE80211_STYPE_DATA && | |
535 | stype != IEEE80211_STYPE_DATA_CFACK && | |
536 | stype != IEEE80211_STYPE_DATA_CFPOLL && | |
537 | stype != IEEE80211_STYPE_DATA_CFACKPOLL) { | |
538 | if (stype != IEEE80211_STYPE_NULLFUNC) | |
0edd5b44 JG |
539 | IEEE80211_DEBUG_DROP("RX: dropped data frame " |
540 | "with no data (type=0x%02x, " | |
541 | "subtype=0x%02x, len=%d)\n", | |
542 | type, stype, skb->len); | |
b453872c JG |
543 | goto rx_dropped; |
544 | } | |
545 | ||
546 | /* skb: hdr + (possibly fragmented, possibly encrypted) payload */ | |
547 | ||
f13baae4 | 548 | if (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && |
b453872c JG |
549 | (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0) |
550 | goto rx_dropped; | |
551 | ||
0edd5b44 | 552 | hdr = (struct ieee80211_hdr *)skb->data; |
b453872c JG |
553 | |
554 | /* skb: hdr + (possibly fragmented) plaintext payload */ | |
555 | // PR: FIXME: hostap has additional conditions in the "if" below: | |
f13baae4 | 556 | // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && |
b453872c JG |
557 | if ((frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) { |
558 | int flen; | |
559 | struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr); | |
560 | IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag); | |
561 | ||
562 | if (!frag_skb) { | |
563 | IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG, | |
564 | "Rx cannot get skb from fragment " | |
565 | "cache (morefrag=%d seq=%u frag=%u)\n", | |
566 | (fc & IEEE80211_FCTL_MOREFRAGS) != 0, | |
567 | WLAN_GET_SEQ_SEQ(sc), frag); | |
568 | goto rx_dropped; | |
569 | } | |
570 | ||
571 | flen = skb->len; | |
572 | if (frag != 0) | |
573 | flen -= hdrlen; | |
574 | ||
575 | if (frag_skb->tail + flen > frag_skb->end) { | |
576 | printk(KERN_WARNING "%s: host decrypted and " | |
577 | "reassembled frame did not fit skb\n", | |
578 | dev->name); | |
579 | ieee80211_frag_cache_invalidate(ieee, hdr); | |
580 | goto rx_dropped; | |
581 | } | |
582 | ||
583 | if (frag == 0) { | |
584 | /* copy first fragment (including full headers) into | |
585 | * beginning of the fragment cache skb */ | |
586 | memcpy(skb_put(frag_skb, flen), skb->data, flen); | |
587 | } else { | |
588 | /* append frame payload to the end of the fragment | |
589 | * cache skb */ | |
590 | memcpy(skb_put(frag_skb, flen), skb->data + hdrlen, | |
591 | flen); | |
592 | } | |
593 | dev_kfree_skb_any(skb); | |
594 | skb = NULL; | |
595 | ||
596 | if (fc & IEEE80211_FCTL_MOREFRAGS) { | |
597 | /* more fragments expected - leave the skb in fragment | |
598 | * cache for now; it will be delivered to upper layers | |
599 | * after all fragments have been received */ | |
600 | goto rx_exit; | |
601 | } | |
602 | ||
603 | /* this was the last fragment and the frame will be | |
604 | * delivered, so remove skb from fragment cache */ | |
605 | skb = frag_skb; | |
0edd5b44 | 606 | hdr = (struct ieee80211_hdr *)skb->data; |
b453872c JG |
607 | ieee80211_frag_cache_invalidate(ieee, hdr); |
608 | } | |
609 | ||
610 | /* skb: hdr + (possible reassembled) full MSDU payload; possibly still | |
611 | * encrypted/authenticated */ | |
f13baae4 | 612 | if (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && |
b453872c JG |
613 | ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt)) |
614 | goto rx_dropped; | |
615 | ||
0edd5b44 | 616 | hdr = (struct ieee80211_hdr *)skb->data; |
f13baae4 | 617 | if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) { |
0edd5b44 JG |
618 | if ( /*ieee->ieee802_1x && */ |
619 | ieee80211_is_eapol_frame(ieee, skb)) { | |
b453872c JG |
620 | /* pass unencrypted EAPOL frames even if encryption is |
621 | * configured */ | |
b453872c | 622 | } else { |
0edd5b44 JG |
623 | IEEE80211_DEBUG_DROP("encryption configured, but RX " |
624 | "frame not encrypted (SA=" MAC_FMT | |
625 | ")\n", MAC_ARG(hdr->addr2)); | |
b453872c JG |
626 | goto rx_dropped; |
627 | } | |
628 | } | |
629 | ||
f13baae4 | 630 | if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep && |
b453872c | 631 | !ieee80211_is_eapol_frame(ieee, skb)) { |
0edd5b44 JG |
632 | IEEE80211_DEBUG_DROP("dropped unencrypted RX data " |
633 | "frame from " MAC_FMT | |
634 | " (drop_unencrypted=1)\n", | |
635 | MAC_ARG(hdr->addr2)); | |
b453872c JG |
636 | goto rx_dropped; |
637 | } | |
638 | ||
639 | /* skb: hdr + (possible reassembled) full plaintext payload */ | |
640 | ||
641 | payload = skb->data + hdrlen; | |
642 | ethertype = (payload[6] << 8) | payload[7]; | |
643 | ||
644 | #ifdef NOT_YET | |
645 | /* If IEEE 802.1X is used, check whether the port is authorized to send | |
646 | * the received frame. */ | |
647 | if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) { | |
648 | if (ethertype == ETH_P_PAE) { | |
649 | printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n", | |
650 | dev->name); | |
651 | if (ieee->hostapd && ieee->apdev) { | |
652 | /* Send IEEE 802.1X frames to the user | |
653 | * space daemon for processing */ | |
654 | prism2_rx_80211(ieee->apdev, skb, rx_stats, | |
655 | PRISM2_RX_MGMT); | |
656 | ieee->apdevstats.rx_packets++; | |
657 | ieee->apdevstats.rx_bytes += skb->len; | |
658 | goto rx_exit; | |
659 | } | |
660 | } else if (!frame_authorized) { | |
661 | printk(KERN_DEBUG "%s: dropped frame from " | |
662 | "unauthorized port (IEEE 802.1X): " | |
0edd5b44 | 663 | "ethertype=0x%04x\n", dev->name, ethertype); |
b453872c JG |
664 | goto rx_dropped; |
665 | } | |
666 | } | |
667 | #endif | |
668 | ||
669 | /* convert hdr + possible LLC headers into Ethernet header */ | |
670 | if (skb->len - hdrlen >= 8 && | |
671 | ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 && | |
672 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
673 | memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) { | |
674 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
675 | * replace EtherType */ | |
676 | skb_pull(skb, hdrlen + SNAP_SIZE); | |
677 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
678 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
679 | } else { | |
680 | u16 len; | |
681 | /* Leave Ethernet header part of hdr and full payload */ | |
682 | skb_pull(skb, hdrlen); | |
683 | len = htons(skb->len); | |
684 | memcpy(skb_push(skb, 2), &len, 2); | |
685 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
686 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
687 | } | |
688 | ||
689 | #ifdef NOT_YET | |
690 | if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == | |
0edd5b44 | 691 | IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) { |
b453872c JG |
692 | /* Non-standard frame: get addr4 from its bogus location after |
693 | * the payload */ | |
694 | memcpy(skb->data + ETH_ALEN, | |
695 | skb->data + skb->len - ETH_ALEN, ETH_ALEN); | |
696 | skb_trim(skb, skb->len - ETH_ALEN); | |
697 | } | |
698 | #endif | |
699 | ||
700 | stats->rx_packets++; | |
701 | stats->rx_bytes += skb->len; | |
702 | ||
703 | #ifdef NOT_YET | |
0edd5b44 | 704 | if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) { |
b453872c JG |
705 | if (dst[0] & 0x01) { |
706 | /* copy multicast frame both to the higher layers and | |
707 | * to the wireless media */ | |
708 | ieee->ap->bridged_multicast++; | |
709 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
710 | if (skb2 == NULL) | |
711 | printk(KERN_DEBUG "%s: skb_clone failed for " | |
712 | "multicast frame\n", dev->name); | |
713 | } else if (hostap_is_sta_assoc(ieee->ap, dst)) { | |
714 | /* send frame directly to the associated STA using | |
715 | * wireless media and not passing to higher layers */ | |
716 | ieee->ap->bridged_unicast++; | |
717 | skb2 = skb; | |
718 | skb = NULL; | |
719 | } | |
720 | } | |
721 | ||
722 | if (skb2 != NULL) { | |
723 | /* send to wireless media */ | |
724 | skb2->protocol = __constant_htons(ETH_P_802_3); | |
725 | skb2->mac.raw = skb2->nh.raw = skb2->data; | |
726 | /* skb2->nh.raw = skb2->data + ETH_HLEN; */ | |
727 | skb2->dev = dev; | |
728 | dev_queue_xmit(skb2); | |
729 | } | |
b453872c JG |
730 | #endif |
731 | ||
732 | if (skb) { | |
733 | skb->protocol = eth_type_trans(skb, dev); | |
734 | memset(skb->cb, 0, sizeof(skb->cb)); | |
735 | skb->dev = dev; | |
0edd5b44 | 736 | skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */ |
b453872c JG |
737 | netif_rx(skb); |
738 | } | |
739 | ||
0edd5b44 | 740 | rx_exit: |
b453872c JG |
741 | #ifdef NOT_YET |
742 | if (sta) | |
743 | hostap_handle_sta_release(sta); | |
744 | #endif | |
745 | return 1; | |
746 | ||
0edd5b44 | 747 | rx_dropped: |
b453872c JG |
748 | stats->rx_dropped++; |
749 | ||
750 | /* Returning 0 indicates to caller that we have not handled the SKB-- | |
751 | * so it is still allocated and can be used again by underlying | |
752 | * hardware as a DMA target */ | |
753 | return 0; | |
754 | } | |
755 | ||
756 | #define MGMT_FRAME_FIXED_PART_LENGTH 0x24 | |
757 | ||
758 | static inline int ieee80211_is_ofdm_rate(u8 rate) | |
759 | { | |
760 | switch (rate & ~IEEE80211_BASIC_RATE_MASK) { | |
761 | case IEEE80211_OFDM_RATE_6MB: | |
762 | case IEEE80211_OFDM_RATE_9MB: | |
763 | case IEEE80211_OFDM_RATE_12MB: | |
764 | case IEEE80211_OFDM_RATE_18MB: | |
765 | case IEEE80211_OFDM_RATE_24MB: | |
766 | case IEEE80211_OFDM_RATE_36MB: | |
767 | case IEEE80211_OFDM_RATE_48MB: | |
768 | case IEEE80211_OFDM_RATE_54MB: | |
769 | return 1; | |
770 | } | |
0edd5b44 | 771 | return 0; |
b453872c JG |
772 | } |
773 | ||
0edd5b44 JG |
774 | static inline int ieee80211_network_init(struct ieee80211_device *ieee, |
775 | struct ieee80211_probe_response | |
776 | *beacon, | |
777 | struct ieee80211_network *network, | |
778 | struct ieee80211_rx_stats *stats) | |
b453872c JG |
779 | { |
780 | #ifdef CONFIG_IEEE80211_DEBUG | |
781 | char rates_str[64]; | |
782 | char *p; | |
783 | #endif | |
784 | struct ieee80211_info_element *info_element; | |
0edd5b44 | 785 | u16 left; |
b453872c JG |
786 | u8 i; |
787 | ||
788 | /* Pull out fixed field data */ | |
789 | memcpy(network->bssid, beacon->header.addr3, ETH_ALEN); | |
790 | network->capability = beacon->capability; | |
791 | network->last_scanned = jiffies; | |
792 | network->time_stamp[0] = beacon->time_stamp[0]; | |
793 | network->time_stamp[1] = beacon->time_stamp[1]; | |
794 | network->beacon_interval = beacon->beacon_interval; | |
0edd5b44 | 795 | /* Where to pull this? beacon->listen_interval; */ |
b453872c JG |
796 | network->listen_interval = 0x0A; |
797 | network->rates_len = network->rates_ex_len = 0; | |
798 | network->last_associate = 0; | |
799 | network->ssid_len = 0; | |
800 | network->flags = 0; | |
801 | network->atim_window = 0; | |
802 | ||
803 | if (stats->freq == IEEE80211_52GHZ_BAND) { | |
804 | /* for A band (No DS info) */ | |
805 | network->channel = stats->received_channel; | |
806 | } else | |
807 | network->flags |= NETWORK_HAS_CCK; | |
808 | ||
0edd5b44 JG |
809 | network->wpa_ie_len = 0; |
810 | network->rsn_ie_len = 0; | |
b453872c | 811 | |
0edd5b44 | 812 | info_element = &beacon->info_element; |
b453872c JG |
813 | left = stats->len - ((void *)info_element - (void *)beacon); |
814 | while (left >= sizeof(struct ieee80211_info_element_hdr)) { | |
0edd5b44 JG |
815 | if (sizeof(struct ieee80211_info_element_hdr) + |
816 | info_element->len > left) { | |
817 | IEEE80211_DEBUG_SCAN | |
818 | ("SCAN: parse failed: info_element->len + 2 > left : info_element->len+2=%Zd left=%d.\n", | |
819 | info_element->len + | |
820 | sizeof(struct ieee80211_info_element), left); | |
b453872c | 821 | return 1; |
0edd5b44 | 822 | } |
b453872c JG |
823 | |
824 | switch (info_element->id) { | |
825 | case MFIE_TYPE_SSID: | |
826 | if (ieee80211_is_empty_essid(info_element->data, | |
827 | info_element->len)) { | |
828 | network->flags |= NETWORK_EMPTY_ESSID; | |
829 | break; | |
830 | } | |
831 | ||
832 | network->ssid_len = min(info_element->len, | |
0edd5b44 JG |
833 | (u8) IW_ESSID_MAX_SIZE); |
834 | memcpy(network->ssid, info_element->data, | |
835 | network->ssid_len); | |
836 | if (network->ssid_len < IW_ESSID_MAX_SIZE) | |
837 | memset(network->ssid + network->ssid_len, 0, | |
b453872c JG |
838 | IW_ESSID_MAX_SIZE - network->ssid_len); |
839 | ||
840 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_SSID: '%s' len=%d.\n", | |
841 | network->ssid, network->ssid_len); | |
842 | break; | |
843 | ||
844 | case MFIE_TYPE_RATES: | |
845 | #ifdef CONFIG_IEEE80211_DEBUG | |
846 | p = rates_str; | |
847 | #endif | |
0edd5b44 JG |
848 | network->rates_len = |
849 | min(info_element->len, MAX_RATES_LENGTH); | |
b453872c JG |
850 | for (i = 0; i < network->rates_len; i++) { |
851 | network->rates[i] = info_element->data[i]; | |
852 | #ifdef CONFIG_IEEE80211_DEBUG | |
0edd5b44 JG |
853 | p += snprintf(p, |
854 | sizeof(rates_str) - (p - | |
855 | rates_str), | |
856 | "%02X ", network->rates[i]); | |
b453872c | 857 | #endif |
0edd5b44 JG |
858 | if (ieee80211_is_ofdm_rate |
859 | (info_element->data[i])) { | |
b453872c JG |
860 | network->flags |= NETWORK_HAS_OFDM; |
861 | if (info_element->data[i] & | |
862 | IEEE80211_BASIC_RATE_MASK) | |
863 | network->flags &= | |
0edd5b44 | 864 | ~NETWORK_HAS_CCK; |
b453872c JG |
865 | } |
866 | } | |
867 | ||
868 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES: '%s' (%d)\n", | |
869 | rates_str, network->rates_len); | |
870 | break; | |
871 | ||
872 | case MFIE_TYPE_RATES_EX: | |
873 | #ifdef CONFIG_IEEE80211_DEBUG | |
874 | p = rates_str; | |
875 | #endif | |
0edd5b44 JG |
876 | network->rates_ex_len = |
877 | min(info_element->len, MAX_RATES_EX_LENGTH); | |
b453872c JG |
878 | for (i = 0; i < network->rates_ex_len; i++) { |
879 | network->rates_ex[i] = info_element->data[i]; | |
880 | #ifdef CONFIG_IEEE80211_DEBUG | |
0edd5b44 JG |
881 | p += snprintf(p, |
882 | sizeof(rates_str) - (p - | |
883 | rates_str), | |
884 | "%02X ", network->rates[i]); | |
b453872c | 885 | #endif |
0edd5b44 JG |
886 | if (ieee80211_is_ofdm_rate |
887 | (info_element->data[i])) { | |
b453872c JG |
888 | network->flags |= NETWORK_HAS_OFDM; |
889 | if (info_element->data[i] & | |
890 | IEEE80211_BASIC_RATE_MASK) | |
891 | network->flags &= | |
0edd5b44 | 892 | ~NETWORK_HAS_CCK; |
b453872c JG |
893 | } |
894 | } | |
895 | ||
896 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES_EX: '%s' (%d)\n", | |
897 | rates_str, network->rates_ex_len); | |
898 | break; | |
899 | ||
900 | case MFIE_TYPE_DS_SET: | |
0edd5b44 | 901 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_DS_SET: %d\n", |
b453872c JG |
902 | info_element->data[0]); |
903 | if (stats->freq == IEEE80211_24GHZ_BAND) | |
904 | network->channel = info_element->data[0]; | |
905 | break; | |
906 | ||
0edd5b44 JG |
907 | case MFIE_TYPE_FH_SET: |
908 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_FH_SET: ignored\n"); | |
b453872c JG |
909 | break; |
910 | ||
911 | case MFIE_TYPE_CF_SET: | |
912 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_CF_SET: ignored\n"); | |
913 | break; | |
914 | ||
915 | case MFIE_TYPE_TIM: | |
916 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_TIM: ignored\n"); | |
917 | break; | |
918 | ||
919 | case MFIE_TYPE_IBSS_SET: | |
920 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_IBSS_SET: ignored\n"); | |
921 | break; | |
922 | ||
923 | case MFIE_TYPE_CHALLENGE: | |
924 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_CHALLENGE: ignored\n"); | |
925 | break; | |
926 | ||
927 | case MFIE_TYPE_GENERIC: | |
928 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_GENERIC: %d bytes\n", | |
929 | info_element->len); | |
0edd5b44 | 930 | if (info_element->len >= 4 && |
b453872c JG |
931 | info_element->data[0] == 0x00 && |
932 | info_element->data[1] == 0x50 && | |
933 | info_element->data[2] == 0xf2 && | |
934 | info_element->data[3] == 0x01) { | |
935 | network->wpa_ie_len = min(info_element->len + 2, | |
0edd5b44 | 936 | MAX_WPA_IE_LEN); |
b453872c JG |
937 | memcpy(network->wpa_ie, info_element, |
938 | network->wpa_ie_len); | |
939 | } | |
940 | break; | |
941 | ||
942 | case MFIE_TYPE_RSN: | |
943 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_RSN: %d bytes\n", | |
944 | info_element->len); | |
945 | network->rsn_ie_len = min(info_element->len + 2, | |
0edd5b44 | 946 | MAX_WPA_IE_LEN); |
b453872c JG |
947 | memcpy(network->rsn_ie, info_element, |
948 | network->rsn_ie_len); | |
949 | break; | |
950 | ||
951 | default: | |
952 | IEEE80211_DEBUG_SCAN("unsupported IE %d\n", | |
953 | info_element->id); | |
0edd5b44 JG |
954 | break; |
955 | } | |
b453872c JG |
956 | |
957 | left -= sizeof(struct ieee80211_info_element_hdr) + | |
0edd5b44 | 958 | info_element->len; |
b453872c | 959 | info_element = (struct ieee80211_info_element *) |
0edd5b44 JG |
960 | &info_element->data[info_element->len]; |
961 | } | |
b453872c JG |
962 | |
963 | network->mode = 0; | |
964 | if (stats->freq == IEEE80211_52GHZ_BAND) | |
965 | network->mode = IEEE_A; | |
966 | else { | |
967 | if (network->flags & NETWORK_HAS_OFDM) | |
968 | network->mode |= IEEE_G; | |
969 | if (network->flags & NETWORK_HAS_CCK) | |
970 | network->mode |= IEEE_B; | |
971 | } | |
972 | ||
973 | if (network->mode == 0) { | |
974 | IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT ")' " | |
975 | "network.\n", | |
976 | escape_essid(network->ssid, | |
977 | network->ssid_len), | |
978 | MAC_ARG(network->bssid)); | |
979 | return 1; | |
980 | } | |
981 | ||
982 | if (ieee80211_is_empty_essid(network->ssid, network->ssid_len)) | |
983 | network->flags |= NETWORK_EMPTY_ESSID; | |
984 | ||
985 | memcpy(&network->stats, stats, sizeof(network->stats)); | |
986 | ||
987 | return 0; | |
988 | } | |
989 | ||
990 | static inline int is_same_network(struct ieee80211_network *src, | |
991 | struct ieee80211_network *dst) | |
992 | { | |
993 | /* A network is only a duplicate if the channel, BSSID, and ESSID | |
994 | * all match. We treat all <hidden> with the same BSSID and channel | |
995 | * as one network */ | |
996 | return ((src->ssid_len == dst->ssid_len) && | |
997 | (src->channel == dst->channel) && | |
998 | !memcmp(src->bssid, dst->bssid, ETH_ALEN) && | |
999 | !memcmp(src->ssid, dst->ssid, src->ssid_len)); | |
1000 | } | |
1001 | ||
1002 | static inline void update_network(struct ieee80211_network *dst, | |
1003 | struct ieee80211_network *src) | |
1004 | { | |
1005 | memcpy(&dst->stats, &src->stats, sizeof(struct ieee80211_rx_stats)); | |
1006 | dst->capability = src->capability; | |
1007 | memcpy(dst->rates, src->rates, src->rates_len); | |
1008 | dst->rates_len = src->rates_len; | |
1009 | memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len); | |
1010 | dst->rates_ex_len = src->rates_ex_len; | |
1011 | ||
1012 | dst->mode = src->mode; | |
1013 | dst->flags = src->flags; | |
1014 | dst->time_stamp[0] = src->time_stamp[0]; | |
1015 | dst->time_stamp[1] = src->time_stamp[1]; | |
1016 | ||
1017 | dst->beacon_interval = src->beacon_interval; | |
1018 | dst->listen_interval = src->listen_interval; | |
1019 | dst->atim_window = src->atim_window; | |
1020 | ||
1021 | memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len); | |
1022 | dst->wpa_ie_len = src->wpa_ie_len; | |
1023 | memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len); | |
1024 | dst->rsn_ie_len = src->rsn_ie_len; | |
1025 | ||
1026 | dst->last_scanned = jiffies; | |
1027 | /* dst->last_associate is not overwritten */ | |
1028 | } | |
1029 | ||
0edd5b44 JG |
1030 | static inline void ieee80211_process_probe_response(struct ieee80211_device |
1031 | *ieee, | |
1032 | struct | |
1033 | ieee80211_probe_response | |
1034 | *beacon, | |
1035 | struct ieee80211_rx_stats | |
1036 | *stats) | |
b453872c JG |
1037 | { |
1038 | struct ieee80211_network network; | |
1039 | struct ieee80211_network *target; | |
1040 | struct ieee80211_network *oldest = NULL; | |
1041 | #ifdef CONFIG_IEEE80211_DEBUG | |
1042 | struct ieee80211_info_element *info_element = &beacon->info_element; | |
1043 | #endif | |
1044 | unsigned long flags; | |
1045 | ||
0edd5b44 JG |
1046 | IEEE80211_DEBUG_SCAN("'%s' (" MAC_FMT |
1047 | "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n", | |
1048 | escape_essid(info_element->data, | |
1049 | info_element->len), | |
1050 | MAC_ARG(beacon->header.addr3), | |
1051 | (beacon->capability & (1 << 0xf)) ? '1' : '0', | |
1052 | (beacon->capability & (1 << 0xe)) ? '1' : '0', | |
1053 | (beacon->capability & (1 << 0xd)) ? '1' : '0', | |
1054 | (beacon->capability & (1 << 0xc)) ? '1' : '0', | |
1055 | (beacon->capability & (1 << 0xb)) ? '1' : '0', | |
1056 | (beacon->capability & (1 << 0xa)) ? '1' : '0', | |
1057 | (beacon->capability & (1 << 0x9)) ? '1' : '0', | |
1058 | (beacon->capability & (1 << 0x8)) ? '1' : '0', | |
1059 | (beacon->capability & (1 << 0x7)) ? '1' : '0', | |
1060 | (beacon->capability & (1 << 0x6)) ? '1' : '0', | |
1061 | (beacon->capability & (1 << 0x5)) ? '1' : '0', | |
1062 | (beacon->capability & (1 << 0x4)) ? '1' : '0', | |
1063 | (beacon->capability & (1 << 0x3)) ? '1' : '0', | |
1064 | (beacon->capability & (1 << 0x2)) ? '1' : '0', | |
1065 | (beacon->capability & (1 << 0x1)) ? '1' : '0', | |
1066 | (beacon->capability & (1 << 0x0)) ? '1' : '0'); | |
b453872c JG |
1067 | |
1068 | if (ieee80211_network_init(ieee, beacon, &network, stats)) { | |
1069 | IEEE80211_DEBUG_SCAN("Dropped '%s' (" MAC_FMT ") via %s.\n", | |
1070 | escape_essid(info_element->data, | |
1071 | info_element->len), | |
1072 | MAC_ARG(beacon->header.addr3), | |
0edd5b44 JG |
1073 | WLAN_FC_GET_STYPE(beacon->header. |
1074 | frame_ctl) == | |
b453872c JG |
1075 | IEEE80211_STYPE_PROBE_RESP ? |
1076 | "PROBE RESPONSE" : "BEACON"); | |
1077 | return; | |
1078 | } | |
1079 | ||
1080 | /* The network parsed correctly -- so now we scan our known networks | |
1081 | * to see if we can find it in our list. | |
1082 | * | |
1083 | * NOTE: This search is definitely not optimized. Once its doing | |
1084 | * the "right thing" we'll optimize it for efficiency if | |
1085 | * necessary */ | |
1086 | ||
1087 | /* Search for this entry in the list and update it if it is | |
1088 | * already there. */ | |
1089 | ||
1090 | spin_lock_irqsave(&ieee->lock, flags); | |
1091 | ||
1092 | list_for_each_entry(target, &ieee->network_list, list) { | |
1093 | if (is_same_network(target, &network)) | |
1094 | break; | |
1095 | ||
1096 | if ((oldest == NULL) || | |
1097 | (target->last_scanned < oldest->last_scanned)) | |
1098 | oldest = target; | |
1099 | } | |
1100 | ||
1101 | /* If we didn't find a match, then get a new network slot to initialize | |
1102 | * with this beacon's information */ | |
1103 | if (&target->list == &ieee->network_list) { | |
1104 | if (list_empty(&ieee->network_free_list)) { | |
1105 | /* If there are no more slots, expire the oldest */ | |
1106 | list_del(&oldest->list); | |
1107 | target = oldest; | |
1108 | IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT ") from " | |
1109 | "network list.\n", | |
1110 | escape_essid(target->ssid, | |
1111 | target->ssid_len), | |
1112 | MAC_ARG(target->bssid)); | |
1113 | } else { | |
1114 | /* Otherwise just pull from the free list */ | |
1115 | target = list_entry(ieee->network_free_list.next, | |
1116 | struct ieee80211_network, list); | |
1117 | list_del(ieee->network_free_list.next); | |
1118 | } | |
1119 | ||
b453872c JG |
1120 | #ifdef CONFIG_IEEE80211_DEBUG |
1121 | IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT ") via %s.\n", | |
1122 | escape_essid(network.ssid, | |
1123 | network.ssid_len), | |
1124 | MAC_ARG(network.bssid), | |
0edd5b44 JG |
1125 | WLAN_FC_GET_STYPE(beacon->header. |
1126 | frame_ctl) == | |
b453872c JG |
1127 | IEEE80211_STYPE_PROBE_RESP ? |
1128 | "PROBE RESPONSE" : "BEACON"); | |
1129 | #endif | |
1130 | memcpy(target, &network, sizeof(*target)); | |
1131 | list_add_tail(&target->list, &ieee->network_list); | |
1132 | } else { | |
1133 | IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n", | |
1134 | escape_essid(target->ssid, | |
1135 | target->ssid_len), | |
1136 | MAC_ARG(target->bssid), | |
0edd5b44 JG |
1137 | WLAN_FC_GET_STYPE(beacon->header. |
1138 | frame_ctl) == | |
b453872c JG |
1139 | IEEE80211_STYPE_PROBE_RESP ? |
1140 | "PROBE RESPONSE" : "BEACON"); | |
1141 | update_network(target, &network); | |
1142 | } | |
1143 | ||
1144 | spin_unlock_irqrestore(&ieee->lock, flags); | |
1145 | } | |
1146 | ||
1147 | void ieee80211_rx_mgt(struct ieee80211_device *ieee, | |
1148 | struct ieee80211_hdr *header, | |
1149 | struct ieee80211_rx_stats *stats) | |
1150 | { | |
1151 | switch (WLAN_FC_GET_STYPE(header->frame_ctl)) { | |
1152 | case IEEE80211_STYPE_ASSOC_RESP: | |
1153 | IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n", | |
1154 | WLAN_FC_GET_STYPE(header->frame_ctl)); | |
1155 | break; | |
1156 | ||
1157 | case IEEE80211_STYPE_REASSOC_RESP: | |
1158 | IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n", | |
1159 | WLAN_FC_GET_STYPE(header->frame_ctl)); | |
1160 | break; | |
1161 | ||
1162 | case IEEE80211_STYPE_PROBE_RESP: | |
1163 | IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n", | |
1164 | WLAN_FC_GET_STYPE(header->frame_ctl)); | |
1165 | IEEE80211_DEBUG_SCAN("Probe response\n"); | |
0edd5b44 JG |
1166 | ieee80211_process_probe_response(ieee, |
1167 | (struct | |
1168 | ieee80211_probe_response *) | |
1169 | header, stats); | |
b453872c JG |
1170 | break; |
1171 | ||
1172 | case IEEE80211_STYPE_BEACON: | |
1173 | IEEE80211_DEBUG_MGMT("received BEACON (%d)\n", | |
1174 | WLAN_FC_GET_STYPE(header->frame_ctl)); | |
1175 | IEEE80211_DEBUG_SCAN("Beacon\n"); | |
0edd5b44 JG |
1176 | ieee80211_process_probe_response(ieee, |
1177 | (struct | |
1178 | ieee80211_probe_response *) | |
1179 | header, stats); | |
b453872c JG |
1180 | break; |
1181 | ||
1182 | default: | |
1183 | IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n", | |
1184 | WLAN_FC_GET_STYPE(header->frame_ctl)); | |
1185 | IEEE80211_WARNING("%s: Unknown management packet: %d\n", | |
1186 | ieee->dev->name, | |
1187 | WLAN_FC_GET_STYPE(header->frame_ctl)); | |
1188 | break; | |
1189 | } | |
1190 | } | |
1191 | ||
b453872c JG |
1192 | EXPORT_SYMBOL(ieee80211_rx_mgt); |
1193 | EXPORT_SYMBOL(ieee80211_rx); |