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Chinese: add translation of oops-tracing.txt
[pv_ops_mirror.git] / drivers / net / wireless / hostap / hostap_80211_rx.c
blobef084df3d48eb87d78204c014795b75a7970467e
1 #include <linux/etherdevice.h>
2 #include <net/ieee80211_crypt.h>
3
4 #include "hostap_80211.h"
5 #include "hostap.h"
6 #include "hostap_ap.h"
7
8 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
9 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
10 static unsigned char rfc1042_header[] =
11 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
12 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
13 static unsigned char bridge_tunnel_header[] =
14 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
15 /* No encapsulation header if EtherType < 0x600 (=length) */
16
17 void hostap_dump_rx_80211(const char *name, struct sk_buff *skb,
18 struct hostap_80211_rx_status *rx_stats)
19 {
20 struct ieee80211_hdr_4addr *hdr;
21 u16 fc;
22 DECLARE_MAC_BUF(mac);
23
24 hdr = (struct ieee80211_hdr_4addr *) skb->data;
25
26 printk(KERN_DEBUG "%s: RX signal=%d noise=%d rate=%d len=%d "
27 "jiffies=%ld\n",
28 name, rx_stats->signal, rx_stats->noise, rx_stats->rate,
29 skb->len, jiffies);
30
31 if (skb->len < 2)
32 return;
33
34 fc = le16_to_cpu(hdr->frame_ctl);
35 printk(KERN_DEBUG " FC=0x%04x (type=%d:%d)%s%s",
36 fc, WLAN_FC_GET_TYPE(fc) >> 2, WLAN_FC_GET_STYPE(fc) >> 4,
37 fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "",
38 fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : "");
39
40 if (skb->len < IEEE80211_DATA_HDR3_LEN) {
41 printk("\n");
42 return;
43 }
44
45 printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id),
46 le16_to_cpu(hdr->seq_ctl));
47
48 printk(KERN_DEBUG " A1=%s", print_mac(mac, hdr->addr1));
49 printk(" A2=%s", print_mac(mac, hdr->addr2));
50 printk(" A3=%s", print_mac(mac, hdr->addr3));
51 if (skb->len >= 30)
52 printk(" A4=%s", print_mac(mac, hdr->addr4));
53 printk("\n");
54 }
55
56
57 /* Send RX frame to netif with 802.11 (and possible prism) header.
58 * Called from hardware or software IRQ context. */
59 int prism2_rx_80211(struct net_device *dev, struct sk_buff *skb,
60 struct hostap_80211_rx_status *rx_stats, int type)
61 {
62 struct hostap_interface *iface;
63 local_info_t *local;
64 int hdrlen, phdrlen, head_need, tail_need;
65 u16 fc;
66 int prism_header, ret;
67 struct ieee80211_hdr_4addr *hdr;
68
69 iface = netdev_priv(dev);
70 local = iface->local;
71 dev->last_rx = jiffies;
72
73 if (dev->type == ARPHRD_IEEE80211_PRISM) {
74 if (local->monitor_type == PRISM2_MONITOR_PRISM) {
75 prism_header = 1;
76 phdrlen = sizeof(struct linux_wlan_ng_prism_hdr);
77 } else { /* local->monitor_type == PRISM2_MONITOR_CAPHDR */
78 prism_header = 2;
79 phdrlen = sizeof(struct linux_wlan_ng_cap_hdr);
80 }
81 } else {
82 prism_header = 0;
83 phdrlen = 0;
84 }
85
86 hdr = (struct ieee80211_hdr_4addr *) skb->data;
87 fc = le16_to_cpu(hdr->frame_ctl);
88
89 if (type == PRISM2_RX_MGMT && (fc & IEEE80211_FCTL_VERS)) {
90 printk(KERN_DEBUG "%s: dropped management frame with header "
91 "version %d\n", dev->name, fc & IEEE80211_FCTL_VERS);
92 dev_kfree_skb_any(skb);
93 return 0;
94 }
95
96 hdrlen = hostap_80211_get_hdrlen(fc);
97
98 /* check if there is enough room for extra data; if not, expand skb
99 * buffer to be large enough for the changes */
100 head_need = phdrlen;
101 tail_need = 0;
102 #ifdef PRISM2_ADD_BOGUS_CRC
103 tail_need += 4;
104 #endif /* PRISM2_ADD_BOGUS_CRC */
105
106 head_need -= skb_headroom(skb);
107 tail_need -= skb_tailroom(skb);
108
109 if (head_need > 0 || tail_need > 0) {
110 if (pskb_expand_head(skb, head_need > 0 ? head_need : 0,
111 tail_need > 0 ? tail_need : 0,
112 GFP_ATOMIC)) {
113 printk(KERN_DEBUG "%s: prism2_rx_80211 failed to "
114 "reallocate skb buffer\n", dev->name);
115 dev_kfree_skb_any(skb);
116 return 0;
117 }
118 }
119
120 /* We now have an skb with enough head and tail room, so just insert
121 * the extra data */
122
123 #ifdef PRISM2_ADD_BOGUS_CRC
124 memset(skb_put(skb, 4), 0xff, 4); /* Prism2 strips CRC */
125 #endif /* PRISM2_ADD_BOGUS_CRC */
126
127 if (prism_header == 1) {
128 struct linux_wlan_ng_prism_hdr *hdr;
129 hdr = (struct linux_wlan_ng_prism_hdr *)
130 skb_push(skb, phdrlen);
131 memset(hdr, 0, phdrlen);
132 hdr->msgcode = LWNG_CAP_DID_BASE;
133 hdr->msglen = sizeof(*hdr);
134 memcpy(hdr->devname, dev->name, sizeof(hdr->devname));
135 #define LWNG_SETVAL(f,i,s,l,d) \
136 hdr->f.did = LWNG_CAP_DID_BASE | (i << 12); \
137 hdr->f.status = s; hdr->f.len = l; hdr->f.data = d
138 LWNG_SETVAL(hosttime, 1, 0, 4, jiffies);
139 LWNG_SETVAL(mactime, 2, 0, 4, rx_stats->mac_time);
140 LWNG_SETVAL(channel, 3, 1 /* no value */, 4, 0);
141 LWNG_SETVAL(rssi, 4, 1 /* no value */, 4, 0);
142 LWNG_SETVAL(sq, 5, 1 /* no value */, 4, 0);
143 LWNG_SETVAL(signal, 6, 0, 4, rx_stats->signal);
144 LWNG_SETVAL(noise, 7, 0, 4, rx_stats->noise);
145 LWNG_SETVAL(rate, 8, 0, 4, rx_stats->rate / 5);
146 LWNG_SETVAL(istx, 9, 0, 4, 0);
147 LWNG_SETVAL(frmlen, 10, 0, 4, skb->len - phdrlen);
148 #undef LWNG_SETVAL
149 } else if (prism_header == 2) {
150 struct linux_wlan_ng_cap_hdr *hdr;
151 hdr = (struct linux_wlan_ng_cap_hdr *)
152 skb_push(skb, phdrlen);
153 memset(hdr, 0, phdrlen);
154 hdr->version = htonl(LWNG_CAPHDR_VERSION);
155 hdr->length = htonl(phdrlen);
156 hdr->mactime = __cpu_to_be64(rx_stats->mac_time);
157 hdr->hosttime = __cpu_to_be64(jiffies);
158 hdr->phytype = htonl(4); /* dss_dot11_b */
159 hdr->channel = htonl(local->channel);
160 hdr->datarate = htonl(rx_stats->rate);
161 hdr->antenna = htonl(0); /* unknown */
162 hdr->priority = htonl(0); /* unknown */
163 hdr->ssi_type = htonl(3); /* raw */
164 hdr->ssi_signal = htonl(rx_stats->signal);
165 hdr->ssi_noise = htonl(rx_stats->noise);
166 hdr->preamble = htonl(0); /* unknown */
167 hdr->encoding = htonl(1); /* cck */
168 }
169
170 ret = skb->len - phdrlen;
171 skb->dev = dev;
172 skb_reset_mac_header(skb);
173 skb_pull(skb, hdrlen);
174 if (prism_header)
175 skb_pull(skb, phdrlen);
176 skb->pkt_type = PACKET_OTHERHOST;
177 skb->protocol = __constant_htons(ETH_P_802_2);
178 memset(skb->cb, 0, sizeof(skb->cb));
179 netif_rx(skb);
180
181 return ret;
182 }
183
184
185 /* Called only as a tasklet (software IRQ) */
186 static void monitor_rx(struct net_device *dev, struct sk_buff *skb,
187 struct hostap_80211_rx_status *rx_stats)
188 {
189 struct net_device_stats *stats;
190 int len;
191
192 len = prism2_rx_80211(dev, skb, rx_stats, PRISM2_RX_MONITOR);
193 stats = hostap_get_stats(dev);
194 stats->rx_packets++;
195 stats->rx_bytes += len;
196 }
197
198
199 /* Called only as a tasklet (software IRQ) */
200 static struct prism2_frag_entry *
201 prism2_frag_cache_find(local_info_t *local, unsigned int seq,
202 unsigned int frag, u8 *src, u8 *dst)
203 {
204 struct prism2_frag_entry *entry;
205 int i;
206
207 for (i = 0; i < PRISM2_FRAG_CACHE_LEN; i++) {
208 entry = &local->frag_cache[i];
209 if (entry->skb != NULL &&
210 time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
211 printk(KERN_DEBUG "%s: expiring fragment cache entry "
212 "seq=%u last_frag=%u\n",
213 local->dev->name, entry->seq, entry->last_frag);
214 dev_kfree_skb(entry->skb);
215 entry->skb = NULL;
216 }
217
218 if (entry->skb != NULL && entry->seq == seq &&
219 (entry->last_frag + 1 == frag || frag == -1) &&
220 memcmp(entry->src_addr, src, ETH_ALEN) == 0 &&
221 memcmp(entry->dst_addr, dst, ETH_ALEN) == 0)
222 return entry;
223 }
224
225 return NULL;
226 }
227
228
229 /* Called only as a tasklet (software IRQ) */
230 static struct sk_buff *
231 prism2_frag_cache_get(local_info_t *local, struct ieee80211_hdr_4addr *hdr)
232 {
233 struct sk_buff *skb = NULL;
234 u16 sc;
235 unsigned int frag, seq;
236 struct prism2_frag_entry *entry;
237
238 sc = le16_to_cpu(hdr->seq_ctl);
239 frag = WLAN_GET_SEQ_FRAG(sc);
240 seq = WLAN_GET_SEQ_SEQ(sc) >> 4;
241
242 if (frag == 0) {
243 /* Reserve enough space to fit maximum frame length */
244 skb = dev_alloc_skb(local->dev->mtu +
245 sizeof(struct ieee80211_hdr_4addr) +
246 8 /* LLC */ +
247 2 /* alignment */ +
248 8 /* WEP */ + ETH_ALEN /* WDS */);
249 if (skb == NULL)
250 return NULL;
251
252 entry = &local->frag_cache[local->frag_next_idx];
253 local->frag_next_idx++;
254 if (local->frag_next_idx >= PRISM2_FRAG_CACHE_LEN)
255 local->frag_next_idx = 0;
256
257 if (entry->skb != NULL)
258 dev_kfree_skb(entry->skb);
259
260 entry->first_frag_time = jiffies;
261 entry->seq = seq;
262 entry->last_frag = frag;
263 entry->skb = skb;
264 memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
265 memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
266 } else {
267 /* received a fragment of a frame for which the head fragment
268 * should have already been received */
269 entry = prism2_frag_cache_find(local, seq, frag, hdr->addr2,
270 hdr->addr1);
271 if (entry != NULL) {
272 entry->last_frag = frag;
273 skb = entry->skb;
274 }
275 }
276
277 return skb;
278 }
279
280
281 /* Called only as a tasklet (software IRQ) */
282 static int prism2_frag_cache_invalidate(local_info_t *local,
283 struct ieee80211_hdr_4addr *hdr)
284 {
285 u16 sc;
286 unsigned int seq;
287 struct prism2_frag_entry *entry;
288
289 sc = le16_to_cpu(hdr->seq_ctl);
290 seq = WLAN_GET_SEQ_SEQ(sc) >> 4;
291
292 entry = prism2_frag_cache_find(local, seq, -1, hdr->addr2, hdr->addr1);
293
294 if (entry == NULL) {
295 printk(KERN_DEBUG "%s: could not invalidate fragment cache "
296 "entry (seq=%u)\n",
297 local->dev->name, seq);
298 return -1;
299 }
300
301 entry->skb = NULL;
302 return 0;
303 }
304
305
306 static struct hostap_bss_info *__hostap_get_bss(local_info_t *local, u8 *bssid,
307 u8 *ssid, size_t ssid_len)
308 {
309 struct list_head *ptr;
310 struct hostap_bss_info *bss;
311
312 list_for_each(ptr, &local->bss_list) {
313 bss = list_entry(ptr, struct hostap_bss_info, list);
314 if (memcmp(bss->bssid, bssid, ETH_ALEN) == 0 &&
315 (ssid == NULL ||
316 (ssid_len == bss->ssid_len &&
317 memcmp(ssid, bss->ssid, ssid_len) == 0))) {
318 list_move(&bss->list, &local->bss_list);
319 return bss;
320 }
321 }
322
323 return NULL;
324 }
325
326
327 static struct hostap_bss_info *__hostap_add_bss(local_info_t *local, u8 *bssid,
328 u8 *ssid, size_t ssid_len)
329 {
330 struct hostap_bss_info *bss;
331
332 if (local->num_bss_info >= HOSTAP_MAX_BSS_COUNT) {
333 bss = list_entry(local->bss_list.prev,
334 struct hostap_bss_info, list);
335 list_del(&bss->list);
336 local->num_bss_info--;
337 } else {
338 bss = (struct hostap_bss_info *)
339 kmalloc(sizeof(*bss), GFP_ATOMIC);
340 if (bss == NULL)
341 return NULL;
342 }
343
344 memset(bss, 0, sizeof(*bss));
345 memcpy(bss->bssid, bssid, ETH_ALEN);
346 memcpy(bss->ssid, ssid, ssid_len);
347 bss->ssid_len = ssid_len;
348 local->num_bss_info++;
349 list_add(&bss->list, &local->bss_list);
350 return bss;
351 }
352
353
354 static void __hostap_expire_bss(local_info_t *local)
355 {
356 struct hostap_bss_info *bss;
357
358 while (local->num_bss_info > 0) {
359 bss = list_entry(local->bss_list.prev,
360 struct hostap_bss_info, list);
361 if (!time_after(jiffies, bss->last_update + 60 * HZ))
362 break;
363
364 list_del(&bss->list);
365 local->num_bss_info--;
366 kfree(bss);
367 }
368 }
369
370
371 /* Both IEEE 802.11 Beacon and Probe Response frames have similar structure, so
372 * the same routine can be used to parse both of them. */
373 static void hostap_rx_sta_beacon(local_info_t *local, struct sk_buff *skb,
374 int stype)
375 {
376 struct hostap_ieee80211_mgmt *mgmt;
377 int left, chan = 0;
378 u8 *pos;
379 u8 *ssid = NULL, *wpa = NULL, *rsn = NULL;
380 size_t ssid_len = 0, wpa_len = 0, rsn_len = 0;
381 struct hostap_bss_info *bss;
382
383 if (skb->len < IEEE80211_MGMT_HDR_LEN + sizeof(mgmt->u.beacon))
384 return;
385
386 mgmt = (struct hostap_ieee80211_mgmt *) skb->data;
387 pos = mgmt->u.beacon.variable;
388 left = skb->len - (pos - skb->data);
389
390 while (left >= 2) {
391 if (2 + pos[1] > left)
392 return; /* parse failed */
393 switch (*pos) {
394 case WLAN_EID_SSID:
395 ssid = pos + 2;
396 ssid_len = pos[1];
397 break;
398 case WLAN_EID_GENERIC:
399 if (pos[1] >= 4 &&
400 pos[2] == 0x00 && pos[3] == 0x50 &&
401 pos[4] == 0xf2 && pos[5] == 1) {
402 wpa = pos;
403 wpa_len = pos[1] + 2;
404 }
405 break;
406 case WLAN_EID_RSN:
407 rsn = pos;
408 rsn_len = pos[1] + 2;
409 break;
410 case WLAN_EID_DS_PARAMS:
411 if (pos[1] >= 1)
412 chan = pos[2];
413 break;
414 }
415 left -= 2 + pos[1];
416 pos += 2 + pos[1];
417 }
418
419 if (wpa_len > MAX_WPA_IE_LEN)
420 wpa_len = MAX_WPA_IE_LEN;
421 if (rsn_len > MAX_WPA_IE_LEN)
422 rsn_len = MAX_WPA_IE_LEN;
423 if (ssid_len > sizeof(bss->ssid))
424 ssid_len = sizeof(bss->ssid);
425
426 spin_lock(&local->lock);
427 bss = __hostap_get_bss(local, mgmt->bssid, ssid, ssid_len);
428 if (bss == NULL)
429 bss = __hostap_add_bss(local, mgmt->bssid, ssid, ssid_len);
430 if (bss) {
431 bss->last_update = jiffies;
432 bss->count++;
433 bss->capab_info = le16_to_cpu(mgmt->u.beacon.capab_info);
434 if (wpa) {
435 memcpy(bss->wpa_ie, wpa, wpa_len);
436 bss->wpa_ie_len = wpa_len;
437 } else
438 bss->wpa_ie_len = 0;
439 if (rsn) {
440 memcpy(bss->rsn_ie, rsn, rsn_len);
441 bss->rsn_ie_len = rsn_len;
442 } else
443 bss->rsn_ie_len = 0;
444 bss->chan = chan;
445 }
446 __hostap_expire_bss(local);
447 spin_unlock(&local->lock);
448 }
449
450
451 static int
452 hostap_rx_frame_mgmt(local_info_t *local, struct sk_buff *skb,
453 struct hostap_80211_rx_status *rx_stats, u16 type,
454 u16 stype)
455 {
456 if (local->iw_mode == IW_MODE_MASTER) {
457 hostap_update_sta_ps(local, (struct ieee80211_hdr_4addr *)
458 skb->data);
459 }
460
461 if (local->hostapd && type == IEEE80211_FTYPE_MGMT) {
462 if (stype == IEEE80211_STYPE_BEACON &&
463 local->iw_mode == IW_MODE_MASTER) {
464 struct sk_buff *skb2;
465 /* Process beacon frames also in kernel driver to
466 * update STA(AP) table statistics */
467 skb2 = skb_clone(skb, GFP_ATOMIC);
468 if (skb2)
469 hostap_rx(skb2->dev, skb2, rx_stats);
470 }
471
472 /* send management frames to the user space daemon for
473 * processing */
474 local->apdevstats.rx_packets++;
475 local->apdevstats.rx_bytes += skb->len;
476 if (local->apdev == NULL)
477 return -1;
478 prism2_rx_80211(local->apdev, skb, rx_stats, PRISM2_RX_MGMT);
479 return 0;
480 }
481
482 if (local->iw_mode == IW_MODE_MASTER) {
483 if (type != IEEE80211_FTYPE_MGMT &&
484 type != IEEE80211_FTYPE_CTL) {
485 printk(KERN_DEBUG "%s: unknown management frame "
486 "(type=0x%02x, stype=0x%02x) dropped\n",
487 skb->dev->name, type >> 2, stype >> 4);
488 return -1;
489 }
490
491 hostap_rx(skb->dev, skb, rx_stats);
492 return 0;
493 } else if (type == IEEE80211_FTYPE_MGMT &&
494 (stype == IEEE80211_STYPE_BEACON ||
495 stype == IEEE80211_STYPE_PROBE_RESP)) {
496 hostap_rx_sta_beacon(local, skb, stype);
497 return -1;
498 } else if (type == IEEE80211_FTYPE_MGMT &&
499 (stype == IEEE80211_STYPE_ASSOC_RESP ||
500 stype == IEEE80211_STYPE_REASSOC_RESP)) {
501 /* Ignore (Re)AssocResp silently since these are not currently
502 * needed but are still received when WPA/RSN mode is enabled.
503 */
504 return -1;
505 } else {
506 printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: dropped unhandled"
507 " management frame in non-Host AP mode (type=%d:%d)\n",
508 skb->dev->name, type >> 2, stype >> 4);
509 return -1;
510 }
511 }
512
513
514 /* Called only as a tasklet (software IRQ) */
515 static struct net_device *prism2_rx_get_wds(local_info_t *local,
516 u8 *addr)
517 {
518 struct hostap_interface *iface = NULL;
519 struct list_head *ptr;
520
521 read_lock_bh(&local->iface_lock);
522 list_for_each(ptr, &local->hostap_interfaces) {
523 iface = list_entry(ptr, struct hostap_interface, list);
524 if (iface->type == HOSTAP_INTERFACE_WDS &&
525 memcmp(iface->u.wds.remote_addr, addr, ETH_ALEN) == 0)
526 break;
527 iface = NULL;
528 }
529 read_unlock_bh(&local->iface_lock);
530
531 return iface ? iface->dev : NULL;
532 }
533
534
535 static int
536 hostap_rx_frame_wds(local_info_t *local, struct ieee80211_hdr_4addr *hdr,
537 u16 fc, struct net_device **wds)
538 {
539 DECLARE_MAC_BUF(mac);
540 /* FIX: is this really supposed to accept WDS frames only in Master
541 * mode? What about Repeater or Managed with WDS frames? */
542 if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) !=
543 (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS) &&
544 (local->iw_mode != IW_MODE_MASTER || !(fc & IEEE80211_FCTL_TODS)))
545 return 0; /* not a WDS frame */
546
547 /* Possible WDS frame: either IEEE 802.11 compliant (if FromDS)
548 * or own non-standard frame with 4th address after payload */
549 if (memcmp(hdr->addr1, local->dev->dev_addr, ETH_ALEN) != 0 &&
550 (hdr->addr1[0] != 0xff || hdr->addr1[1] != 0xff ||
551 hdr->addr1[2] != 0xff || hdr->addr1[3] != 0xff ||
552 hdr->addr1[4] != 0xff || hdr->addr1[5] != 0xff)) {
553 /* RA (or BSSID) is not ours - drop */
554 PDEBUG(DEBUG_EXTRA, "%s: received WDS frame with "
555 "not own or broadcast %s=%s\n",
556 local->dev->name,
557 fc & IEEE80211_FCTL_FROMDS ? "RA" : "BSSID",
558 print_mac(mac, hdr->addr1));
559 return -1;
560 }
561
562 /* check if the frame came from a registered WDS connection */
563 *wds = prism2_rx_get_wds(local, hdr->addr2);
564 if (*wds == NULL && fc & IEEE80211_FCTL_FROMDS &&
565 (local->iw_mode != IW_MODE_INFRA ||
566 !(local->wds_type & HOSTAP_WDS_AP_CLIENT) ||
567 memcmp(hdr->addr2, local->bssid, ETH_ALEN) != 0)) {
568 /* require that WDS link has been registered with TA or the
569 * frame is from current AP when using 'AP client mode' */
570 PDEBUG(DEBUG_EXTRA, "%s: received WDS[4 addr] frame "
571 "from unknown TA=%s\n",
572 local->dev->name, print_mac(mac, hdr->addr2));
573 if (local->ap && local->ap->autom_ap_wds)
574 hostap_wds_link_oper(local, hdr->addr2, WDS_ADD);
575 return -1;
576 }
577
578 if (*wds && !(fc & IEEE80211_FCTL_FROMDS) && local->ap &&
579 hostap_is_sta_assoc(local->ap, hdr->addr2)) {
580 /* STA is actually associated with us even though it has a
581 * registered WDS link. Assume it is in 'AP client' mode.
582 * Since this is a 3-addr frame, assume it is not (bogus) WDS
583 * frame and process it like any normal ToDS frame from
584 * associated STA. */
585 *wds = NULL;
586 }
587
588 return 0;
589 }
590
591
592 static int hostap_is_eapol_frame(local_info_t *local, struct sk_buff *skb)
593 {
594 struct net_device *dev = local->dev;
595 u16 fc, ethertype;
596 struct ieee80211_hdr_4addr *hdr;
597 u8 *pos;
598
599 if (skb->len < 24)
600 return 0;
601
602 hdr = (struct ieee80211_hdr_4addr *) skb->data;
603 fc = le16_to_cpu(hdr->frame_ctl);
604
605 /* check that the frame is unicast frame to us */
606 if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
607 IEEE80211_FCTL_TODS &&
608 memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
609 memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
610 /* ToDS frame with own addr BSSID and DA */
611 } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
612 IEEE80211_FCTL_FROMDS &&
613 memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
614 /* FromDS frame with own addr as DA */
615 } else
616 return 0;
617
618 if (skb->len < 24 + 8)
619 return 0;
620
621 /* check for port access entity Ethernet type */
622 pos = skb->data + 24;
623 ethertype = (pos[6] << 8) | pos[7];
624 if (ethertype == ETH_P_PAE)
625 return 1;
626
627 return 0;
628 }
629
630
631 /* Called only as a tasklet (software IRQ) */
632 static int
633 hostap_rx_frame_decrypt(local_info_t *local, struct sk_buff *skb,
634 struct ieee80211_crypt_data *crypt)
635 {
636 struct ieee80211_hdr_4addr *hdr;
637 int res, hdrlen;
638 DECLARE_MAC_BUF(mac);
639
640 if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
641 return 0;
642
643 hdr = (struct ieee80211_hdr_4addr *) skb->data;
644 hdrlen = hostap_80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
645
646 if (local->tkip_countermeasures &&
647 strcmp(crypt->ops->name, "TKIP") == 0) {
648 if (net_ratelimit()) {
649 printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
650 "received packet from %s\n",
651 local->dev->name, print_mac(mac, hdr->addr2));
652 }
653 return -1;
654 }
655
656 atomic_inc(&crypt->refcnt);
657 res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
658 atomic_dec(&crypt->refcnt);
659 if (res < 0) {
660 printk(KERN_DEBUG "%s: decryption failed (SA=%s"
661 ") res=%d\n",
662 local->dev->name, print_mac(mac, hdr->addr2), res);
663 local->comm_tallies.rx_discards_wep_undecryptable++;
664 return -1;
665 }
666
667 return res;
668 }
669
670
671 /* Called only as a tasklet (software IRQ) */
672 static int
673 hostap_rx_frame_decrypt_msdu(local_info_t *local, struct sk_buff *skb,
674 int keyidx, struct ieee80211_crypt_data *crypt)
675 {
676 struct ieee80211_hdr_4addr *hdr;
677 int res, hdrlen;
678 DECLARE_MAC_BUF(mac);
679
680 if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
681 return 0;
682
683 hdr = (struct ieee80211_hdr_4addr *) skb->data;
684 hdrlen = hostap_80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
685
686 atomic_inc(&crypt->refcnt);
687 res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
688 atomic_dec(&crypt->refcnt);
689 if (res < 0) {
690 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
691 " (SA=%s keyidx=%d)\n",
692 local->dev->name, print_mac(mac, hdr->addr2), keyidx);
693 return -1;
694 }
695
696 return 0;
697 }
698
699
700 /* All received frames are sent to this function. @skb contains the frame in
701 * IEEE 802.11 format, i.e., in the format it was sent over air.
702 * This function is called only as a tasklet (software IRQ). */
703 void hostap_80211_rx(struct net_device *dev, struct sk_buff *skb,
704 struct hostap_80211_rx_status *rx_stats)
705 {
706 struct hostap_interface *iface;
707 local_info_t *local;
708 struct ieee80211_hdr_4addr *hdr;
709 size_t hdrlen;
710 u16 fc, type, stype, sc;
711 struct net_device *wds = NULL;
712 struct net_device_stats *stats;
713 unsigned int frag;
714 u8 *payload;
715 struct sk_buff *skb2 = NULL;
716 u16 ethertype;
717 int frame_authorized = 0;
718 int from_assoc_ap = 0;
719 u8 dst[ETH_ALEN];
720 u8 src[ETH_ALEN];
721 struct ieee80211_crypt_data *crypt = NULL;
722 void *sta = NULL;
723 int keyidx = 0;
724 DECLARE_MAC_BUF(mac);
725
726 iface = netdev_priv(dev);
727 local = iface->local;
728 iface->stats.rx_packets++;
729 iface->stats.rx_bytes += skb->len;
730
731 /* dev is the master radio device; change this to be the default
732 * virtual interface (this may be changed to WDS device below) */
733 dev = local->ddev;
734 iface = netdev_priv(dev);
735
736 hdr = (struct ieee80211_hdr_4addr *) skb->data;
737 stats = hostap_get_stats(dev);
738
739 if (skb->len < 10)
740 goto rx_dropped;
741
742 fc = le16_to_cpu(hdr->frame_ctl);
743 type = WLAN_FC_GET_TYPE(fc);
744 stype = WLAN_FC_GET_STYPE(fc);
745 sc = le16_to_cpu(hdr->seq_ctl);
746 frag = WLAN_GET_SEQ_FRAG(sc);
747 hdrlen = hostap_80211_get_hdrlen(fc);
748
749 /* Put this code here so that we avoid duplicating it in all
750 * Rx paths. - Jean II */
751 #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */
752 /* If spy monitoring on */
753 if (iface->spy_data.spy_number > 0) {
754 struct iw_quality wstats;
755 wstats.level = rx_stats->signal;
756 wstats.noise = rx_stats->noise;
757 wstats.updated = IW_QUAL_LEVEL_UPDATED | IW_QUAL_NOISE_UPDATED
758 | IW_QUAL_QUAL_INVALID | IW_QUAL_DBM;
759 /* Update spy records */
760 wireless_spy_update(dev, hdr->addr2, &wstats);
761 }
762 #endif /* IW_WIRELESS_SPY */
763 hostap_update_rx_stats(local->ap, hdr, rx_stats);
764
765 if (local->iw_mode == IW_MODE_MONITOR) {
766 monitor_rx(dev, skb, rx_stats);
767 return;
768 }
769
770 if (local->host_decrypt) {
771 int idx = 0;
772 if (skb->len >= hdrlen + 3)
773 idx = skb->data[hdrlen + 3] >> 6;
774 crypt = local->crypt[idx];
775 sta = NULL;
776
777 /* Use station specific key to override default keys if the
778 * receiver address is a unicast address ("individual RA"). If
779 * bcrx_sta_key parameter is set, station specific key is used
780 * even with broad/multicast targets (this is against IEEE
781 * 802.11, but makes it easier to use different keys with
782 * stations that do not support WEP key mapping). */
783
784 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
785 (void) hostap_handle_sta_crypto(local, hdr, &crypt,
786 &sta);
787
788 /* allow NULL decrypt to indicate an station specific override
789 * for default encryption */
790 if (crypt && (crypt->ops == NULL ||
791 crypt->ops->decrypt_mpdu == NULL))
792 crypt = NULL;
793
794 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
795 #if 0
796 /* This seems to be triggered by some (multicast?)
797 * frames from other than current BSS, so just drop the
798 * frames silently instead of filling system log with
799 * these reports. */
800 printk(KERN_DEBUG "%s: WEP decryption failed (not set)"
801 " (SA=%s)\n",
802 local->dev->name, print_mac(mac, hdr->addr2));
803 #endif
804 local->comm_tallies.rx_discards_wep_undecryptable++;
805 goto rx_dropped;
806 }
807 }
808
809 if (type != IEEE80211_FTYPE_DATA) {
810 if (type == IEEE80211_FTYPE_MGMT &&
811 stype == IEEE80211_STYPE_AUTH &&
812 fc & IEEE80211_FCTL_PROTECTED && local->host_decrypt &&
813 (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0)
814 {
815 printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
816 "from %s\n", dev->name,
817 print_mac(mac, hdr->addr2));
818 /* TODO: could inform hostapd about this so that it
819 * could send auth failure report */
820 goto rx_dropped;
821 }
822
823 if (hostap_rx_frame_mgmt(local, skb, rx_stats, type, stype))
824 goto rx_dropped;
825 else
826 goto rx_exit;
827 }
828
829 /* Data frame - extract src/dst addresses */
830 if (skb->len < IEEE80211_DATA_HDR3_LEN)
831 goto rx_dropped;
832
833 switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
834 case IEEE80211_FCTL_FROMDS:
835 memcpy(dst, hdr->addr1, ETH_ALEN);
836 memcpy(src, hdr->addr3, ETH_ALEN);
837 break;
838 case IEEE80211_FCTL_TODS:
839 memcpy(dst, hdr->addr3, ETH_ALEN);
840 memcpy(src, hdr->addr2, ETH_ALEN);
841 break;
842 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
843 if (skb->len < IEEE80211_DATA_HDR4_LEN)
844 goto rx_dropped;
845 memcpy(dst, hdr->addr3, ETH_ALEN);
846 memcpy(src, hdr->addr4, ETH_ALEN);
847 break;
848 case 0:
849 memcpy(dst, hdr->addr1, ETH_ALEN);
850 memcpy(src, hdr->addr2, ETH_ALEN);
851 break;
852 }
853
854 if (hostap_rx_frame_wds(local, hdr, fc, &wds))
855 goto rx_dropped;
856 if (wds) {
857 skb->dev = dev = wds;
858 stats = hostap_get_stats(dev);
859 }
860
861 if (local->iw_mode == IW_MODE_MASTER && !wds &&
862 (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
863 IEEE80211_FCTL_FROMDS &&
864 local->stadev &&
865 memcmp(hdr->addr2, local->assoc_ap_addr, ETH_ALEN) == 0) {
866 /* Frame from BSSID of the AP for which we are a client */
867 skb->dev = dev = local->stadev;
868 stats = hostap_get_stats(dev);
869 from_assoc_ap = 1;
870 }
871
872 dev->last_rx = jiffies;
873
874 if ((local->iw_mode == IW_MODE_MASTER ||
875 local->iw_mode == IW_MODE_REPEAT) &&
876 !from_assoc_ap) {
877 switch (hostap_handle_sta_rx(local, dev, skb, rx_stats,
878 wds != NULL)) {
879 case AP_RX_CONTINUE_NOT_AUTHORIZED:
880 frame_authorized = 0;
881 break;
882 case AP_RX_CONTINUE:
883 frame_authorized = 1;
884 break;
885 case AP_RX_DROP:
886 goto rx_dropped;
887 case AP_RX_EXIT:
888 goto rx_exit;
889 }
890 }
891
892 /* Nullfunc frames may have PS-bit set, so they must be passed to
893 * hostap_handle_sta_rx() before being dropped here. */
894 if (stype != IEEE80211_STYPE_DATA &&
895 stype != IEEE80211_STYPE_DATA_CFACK &&
896 stype != IEEE80211_STYPE_DATA_CFPOLL &&
897 stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
898 if (stype != IEEE80211_STYPE_NULLFUNC)
899 printk(KERN_DEBUG "%s: RX: dropped data frame "
900 "with no data (type=0x%02x, subtype=0x%02x)\n",
901 dev->name, type >> 2, stype >> 4);
902 goto rx_dropped;
903 }
904
905 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
906
907 if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
908 (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0)
909 goto rx_dropped;
910 hdr = (struct ieee80211_hdr_4addr *) skb->data;
911
912 /* skb: hdr + (possibly fragmented) plaintext payload */
913
914 if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
915 (frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
916 int flen;
917 struct sk_buff *frag_skb =
918 prism2_frag_cache_get(local, hdr);
919 if (!frag_skb) {
920 printk(KERN_DEBUG "%s: Rx cannot get skb from "
921 "fragment cache (morefrag=%d seq=%u frag=%u)\n",
922 dev->name, (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
923 WLAN_GET_SEQ_SEQ(sc) >> 4, frag);
924 goto rx_dropped;
925 }
926
927 flen = skb->len;
928 if (frag != 0)
929 flen -= hdrlen;
930
931 if (frag_skb->tail + flen > frag_skb->end) {
932 printk(KERN_WARNING "%s: host decrypted and "
933 "reassembled frame did not fit skb\n",
934 dev->name);
935 prism2_frag_cache_invalidate(local, hdr);
936 goto rx_dropped;
937 }
938
939 if (frag == 0) {
940 /* copy first fragment (including full headers) into
941 * beginning of the fragment cache skb */
942 skb_copy_from_linear_data(skb, skb_put(frag_skb, flen),
943 flen);
944 } else {
945 /* append frame payload to the end of the fragment
946 * cache skb */
947 skb_copy_from_linear_data_offset(skb, hdrlen,
948 skb_put(frag_skb,
949 flen), flen);
950 }
951 dev_kfree_skb(skb);
952 skb = NULL;
953
954 if (fc & IEEE80211_FCTL_MOREFRAGS) {
955 /* more fragments expected - leave the skb in fragment
956 * cache for now; it will be delivered to upper layers
957 * after all fragments have been received */
958 goto rx_exit;
959 }
960
961 /* this was the last fragment and the frame will be
962 * delivered, so remove skb from fragment cache */
963 skb = frag_skb;
964 hdr = (struct ieee80211_hdr_4addr *) skb->data;
965 prism2_frag_cache_invalidate(local, hdr);
966 }
967
968 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
969 * encrypted/authenticated */
970
971 if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
972 hostap_rx_frame_decrypt_msdu(local, skb, keyidx, crypt))
973 goto rx_dropped;
974
975 hdr = (struct ieee80211_hdr_4addr *) skb->data;
976 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !local->open_wep) {
977 if (local->ieee_802_1x &&
978 hostap_is_eapol_frame(local, skb)) {
979 /* pass unencrypted EAPOL frames even if encryption is
980 * configured */
981 PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X - passing "
982 "unencrypted EAPOL frame\n", local->dev->name);
983 } else {
984 printk(KERN_DEBUG "%s: encryption configured, but RX "
985 "frame not encrypted (SA=%s)\n",
986 local->dev->name, print_mac(mac, hdr->addr2));
987 goto rx_dropped;
988 }
989 }
990
991 if (local->drop_unencrypted && !(fc & IEEE80211_FCTL_PROTECTED) &&
992 !hostap_is_eapol_frame(local, skb)) {
993 if (net_ratelimit()) {
994 printk(KERN_DEBUG "%s: dropped unencrypted RX data "
995 "frame from %s"
996 " (drop_unencrypted=1)\n",
997 dev->name, print_mac(mac, hdr->addr2));
998 }
999 goto rx_dropped;
1000 }
1001
1002 /* skb: hdr + (possible reassembled) full plaintext payload */
1003
1004 payload = skb->data + hdrlen;
1005 ethertype = (payload[6] << 8) | payload[7];
1006
1007 /* If IEEE 802.1X is used, check whether the port is authorized to send
1008 * the received frame. */
1009 if (local->ieee_802_1x && local->iw_mode == IW_MODE_MASTER) {
1010 if (ethertype == ETH_P_PAE) {
1011 PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X frame\n",
1012 dev->name);
1013 if (local->hostapd && local->apdev) {
1014 /* Send IEEE 802.1X frames to the user
1015 * space daemon for processing */
1016 prism2_rx_80211(local->apdev, skb, rx_stats,
1017 PRISM2_RX_MGMT);
1018 local->apdevstats.rx_packets++;
1019 local->apdevstats.rx_bytes += skb->len;
1020 goto rx_exit;
1021 }
1022 } else if (!frame_authorized) {
1023 printk(KERN_DEBUG "%s: dropped frame from "
1024 "unauthorized port (IEEE 802.1X): "
1025 "ethertype=0x%04x\n",
1026 dev->name, ethertype);
1027 goto rx_dropped;
1028 }
1029 }
1030
1031 /* convert hdr + possible LLC headers into Ethernet header */
1032 if (skb->len - hdrlen >= 8 &&
1033 ((memcmp(payload, rfc1042_header, 6) == 0 &&
1034 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1035 memcmp(payload, bridge_tunnel_header, 6) == 0)) {
1036 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1037 * replace EtherType */
1038 skb_pull(skb, hdrlen + 6);
1039 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1040 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1041 } else {
1042 u16 len;
1043 /* Leave Ethernet header part of hdr and full payload */
1044 skb_pull(skb, hdrlen);
1045 len = htons(skb->len);
1046 memcpy(skb_push(skb, 2), &len, 2);
1047 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1048 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1049 }
1050
1051 if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
1052 IEEE80211_FCTL_TODS) &&
1053 skb->len >= ETH_HLEN + ETH_ALEN) {
1054 /* Non-standard frame: get addr4 from its bogus location after
1055 * the payload */
1056 skb_copy_from_linear_data_offset(skb, skb->len - ETH_ALEN,
1057 skb->data + ETH_ALEN,
1058 ETH_ALEN);
1059 skb_trim(skb, skb->len - ETH_ALEN);
1060 }
1061
1062 stats->rx_packets++;
1063 stats->rx_bytes += skb->len;
1064
1065 if (local->iw_mode == IW_MODE_MASTER && !wds &&
1066 local->ap->bridge_packets) {
1067 if (dst[0] & 0x01) {
1068 /* copy multicast frame both to the higher layers and
1069 * to the wireless media */
1070 local->ap->bridged_multicast++;
1071 skb2 = skb_clone(skb, GFP_ATOMIC);
1072 if (skb2 == NULL)
1073 printk(KERN_DEBUG "%s: skb_clone failed for "
1074 "multicast frame\n", dev->name);
1075 } else if (hostap_is_sta_authorized(local->ap, dst)) {
1076 /* send frame directly to the associated STA using
1077 * wireless media and not passing to higher layers */
1078 local->ap->bridged_unicast++;
1079 skb2 = skb;
1080 skb = NULL;
1081 }
1082 }
1083
1084 if (skb2 != NULL) {
1085 /* send to wireless media */
1086 skb2->dev = dev;
1087 skb2->protocol = __constant_htons(ETH_P_802_3);
1088 skb_reset_mac_header(skb2);
1089 skb_reset_network_header(skb2);
1090 /* skb2->network_header += ETH_HLEN; */
1091 dev_queue_xmit(skb2);
1092 }
1093
1094 if (skb) {
1095 skb->protocol = eth_type_trans(skb, dev);
1096 memset(skb->cb, 0, sizeof(skb->cb));
1097 netif_rx(skb);
1098 }
1099
1100 rx_exit:
1101 if (sta)
1102 hostap_handle_sta_release(sta);
1103 return;
1104
1105 rx_dropped:
1106 dev_kfree_skb(skb);
1107
1108 stats->rx_dropped++;
1109 goto rx_exit;
1110 }
1111
1112
1113 EXPORT_SYMBOL(hostap_80211_rx);
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