[NET]: Undo code bloat in hot paths due to print_mac().
[sfrench/cifs-2.6.git] / drivers / net / wireless / hostap / hostap_80211_rx.c
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
639         if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
640                 return 0;
641
642         hdr = (struct ieee80211_hdr_4addr *) skb->data;
643         hdrlen = hostap_80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
644
645         if (local->tkip_countermeasures &&
646             strcmp(crypt->ops->name, "TKIP") == 0) {
647                 if (net_ratelimit()) {
648                         printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
649                                "received packet from " MAC_FMT "\n",
650                                local->dev->name,
651                                hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
652                                hdr->addr2[3], hdr->addr2[4], hdr->addr2[5]);
653                 }
654                 return -1;
655         }
656
657         atomic_inc(&crypt->refcnt);
658         res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
659         atomic_dec(&crypt->refcnt);
660         if (res < 0) {
661                 printk(KERN_DEBUG "%s: decryption failed (SA=" MAC_FMT
662                        ") res=%d\n",
663                        local->dev->name,
664                        hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
665                        hdr->addr2[3], hdr->addr2[4], hdr->addr2[5],
666                        res);
667                 local->comm_tallies.rx_discards_wep_undecryptable++;
668                 return -1;
669         }
670
671         return res;
672 }
673
674
675 /* Called only as a tasklet (software IRQ) */
676 static int
677 hostap_rx_frame_decrypt_msdu(local_info_t *local, struct sk_buff *skb,
678                              int keyidx, struct ieee80211_crypt_data *crypt)
679 {
680         struct ieee80211_hdr_4addr *hdr;
681         int res, hdrlen;
682         DECLARE_MAC_BUF(mac);
683
684         if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
685                 return 0;
686
687         hdr = (struct ieee80211_hdr_4addr *) skb->data;
688         hdrlen = hostap_80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
689
690         atomic_inc(&crypt->refcnt);
691         res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
692         atomic_dec(&crypt->refcnt);
693         if (res < 0) {
694                 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
695                        " (SA=%s keyidx=%d)\n",
696                        local->dev->name, print_mac(mac, hdr->addr2), keyidx);
697                 return -1;
698         }
699
700         return 0;
701 }
702
703
704 /* All received frames are sent to this function. @skb contains the frame in
705  * IEEE 802.11 format, i.e., in the format it was sent over air.
706  * This function is called only as a tasklet (software IRQ). */
707 void hostap_80211_rx(struct net_device *dev, struct sk_buff *skb,
708                      struct hostap_80211_rx_status *rx_stats)
709 {
710         struct hostap_interface *iface;
711         local_info_t *local;
712         struct ieee80211_hdr_4addr *hdr;
713         size_t hdrlen;
714         u16 fc, type, stype, sc;
715         struct net_device *wds = NULL;
716         struct net_device_stats *stats;
717         unsigned int frag;
718         u8 *payload;
719         struct sk_buff *skb2 = NULL;
720         u16 ethertype;
721         int frame_authorized = 0;
722         int from_assoc_ap = 0;
723         u8 dst[ETH_ALEN];
724         u8 src[ETH_ALEN];
725         struct ieee80211_crypt_data *crypt = NULL;
726         void *sta = NULL;
727         int keyidx = 0;
728
729         iface = netdev_priv(dev);
730         local = iface->local;
731         iface->stats.rx_packets++;
732         iface->stats.rx_bytes += skb->len;
733
734         /* dev is the master radio device; change this to be the default
735          * virtual interface (this may be changed to WDS device below) */
736         dev = local->ddev;
737         iface = netdev_priv(dev);
738
739         hdr = (struct ieee80211_hdr_4addr *) skb->data;
740         stats = hostap_get_stats(dev);
741
742         if (skb->len < 10)
743                 goto rx_dropped;
744
745         fc = le16_to_cpu(hdr->frame_ctl);
746         type = WLAN_FC_GET_TYPE(fc);
747         stype = WLAN_FC_GET_STYPE(fc);
748         sc = le16_to_cpu(hdr->seq_ctl);
749         frag = WLAN_GET_SEQ_FRAG(sc);
750         hdrlen = hostap_80211_get_hdrlen(fc);
751
752         /* Put this code here so that we avoid duplicating it in all
753          * Rx paths. - Jean II */
754 #ifdef IW_WIRELESS_SPY          /* defined in iw_handler.h */
755         /* If spy monitoring on */
756         if (iface->spy_data.spy_number > 0) {
757                 struct iw_quality wstats;
758                 wstats.level = rx_stats->signal;
759                 wstats.noise = rx_stats->noise;
760                 wstats.updated = IW_QUAL_LEVEL_UPDATED | IW_QUAL_NOISE_UPDATED
761                         | IW_QUAL_QUAL_INVALID | IW_QUAL_DBM;
762                 /* Update spy records */
763                 wireless_spy_update(dev, hdr->addr2, &wstats);
764         }
765 #endif /* IW_WIRELESS_SPY */
766         hostap_update_rx_stats(local->ap, hdr, rx_stats);
767
768         if (local->iw_mode == IW_MODE_MONITOR) {
769                 monitor_rx(dev, skb, rx_stats);
770                 return;
771         }
772
773         if (local->host_decrypt) {
774                 int idx = 0;
775                 if (skb->len >= hdrlen + 3)
776                         idx = skb->data[hdrlen + 3] >> 6;
777                 crypt = local->crypt[idx];
778                 sta = NULL;
779
780                 /* Use station specific key to override default keys if the
781                  * receiver address is a unicast address ("individual RA"). If
782                  * bcrx_sta_key parameter is set, station specific key is used
783                  * even with broad/multicast targets (this is against IEEE
784                  * 802.11, but makes it easier to use different keys with
785                  * stations that do not support WEP key mapping). */
786
787                 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
788                         (void) hostap_handle_sta_crypto(local, hdr, &crypt,
789                                                         &sta);
790
791                 /* allow NULL decrypt to indicate an station specific override
792                  * for default encryption */
793                 if (crypt && (crypt->ops == NULL ||
794                               crypt->ops->decrypt_mpdu == NULL))
795                         crypt = NULL;
796
797                 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
798 #if 0
799                         /* This seems to be triggered by some (multicast?)
800                          * frames from other than current BSS, so just drop the
801                          * frames silently instead of filling system log with
802                          * these reports. */
803                         printk(KERN_DEBUG "%s: WEP decryption failed (not set)"
804                                " (SA=" MAC_FMT ")\n",
805                                local->dev->name,
806                                hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
807                                hdr->addr2[3], hdr->addr2[4], hdr->addr2[5]);
808 #endif
809                         local->comm_tallies.rx_discards_wep_undecryptable++;
810                         goto rx_dropped;
811                 }
812         }
813
814         if (type != IEEE80211_FTYPE_DATA) {
815                 if (type == IEEE80211_FTYPE_MGMT &&
816                     stype == IEEE80211_STYPE_AUTH &&
817                     fc & IEEE80211_FCTL_PROTECTED && local->host_decrypt &&
818                     (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0)
819                 {
820                         printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
821                                "from " MAC_FMT "\n", dev->name,
822                                hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
823                                hdr->addr2[3], hdr->addr2[4], hdr->addr2[5]);
824                         /* TODO: could inform hostapd about this so that it
825                          * could send auth failure report */
826                         goto rx_dropped;
827                 }
828
829                 if (hostap_rx_frame_mgmt(local, skb, rx_stats, type, stype))
830                         goto rx_dropped;
831                 else
832                         goto rx_exit;
833         }
834
835         /* Data frame - extract src/dst addresses */
836         if (skb->len < IEEE80211_DATA_HDR3_LEN)
837                 goto rx_dropped;
838
839         switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
840         case IEEE80211_FCTL_FROMDS:
841                 memcpy(dst, hdr->addr1, ETH_ALEN);
842                 memcpy(src, hdr->addr3, ETH_ALEN);
843                 break;
844         case IEEE80211_FCTL_TODS:
845                 memcpy(dst, hdr->addr3, ETH_ALEN);
846                 memcpy(src, hdr->addr2, ETH_ALEN);
847                 break;
848         case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
849                 if (skb->len < IEEE80211_DATA_HDR4_LEN)
850                         goto rx_dropped;
851                 memcpy(dst, hdr->addr3, ETH_ALEN);
852                 memcpy(src, hdr->addr4, ETH_ALEN);
853                 break;
854         case 0:
855                 memcpy(dst, hdr->addr1, ETH_ALEN);
856                 memcpy(src, hdr->addr2, ETH_ALEN);
857                 break;
858         }
859
860         if (hostap_rx_frame_wds(local, hdr, fc, &wds))
861                 goto rx_dropped;
862         if (wds) {
863                 skb->dev = dev = wds;
864                 stats = hostap_get_stats(dev);
865         }
866
867         if (local->iw_mode == IW_MODE_MASTER && !wds &&
868             (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
869             IEEE80211_FCTL_FROMDS &&
870             local->stadev &&
871             memcmp(hdr->addr2, local->assoc_ap_addr, ETH_ALEN) == 0) {
872                 /* Frame from BSSID of the AP for which we are a client */
873                 skb->dev = dev = local->stadev;
874                 stats = hostap_get_stats(dev);
875                 from_assoc_ap = 1;
876         }
877
878         dev->last_rx = jiffies;
879
880         if ((local->iw_mode == IW_MODE_MASTER ||
881              local->iw_mode == IW_MODE_REPEAT) &&
882             !from_assoc_ap) {
883                 switch (hostap_handle_sta_rx(local, dev, skb, rx_stats,
884                                              wds != NULL)) {
885                 case AP_RX_CONTINUE_NOT_AUTHORIZED:
886                         frame_authorized = 0;
887                         break;
888                 case AP_RX_CONTINUE:
889                         frame_authorized = 1;
890                         break;
891                 case AP_RX_DROP:
892                         goto rx_dropped;
893                 case AP_RX_EXIT:
894                         goto rx_exit;
895                 }
896         }
897
898         /* Nullfunc frames may have PS-bit set, so they must be passed to
899          * hostap_handle_sta_rx() before being dropped here. */
900         if (stype != IEEE80211_STYPE_DATA &&
901             stype != IEEE80211_STYPE_DATA_CFACK &&
902             stype != IEEE80211_STYPE_DATA_CFPOLL &&
903             stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
904                 if (stype != IEEE80211_STYPE_NULLFUNC)
905                         printk(KERN_DEBUG "%s: RX: dropped data frame "
906                                "with no data (type=0x%02x, subtype=0x%02x)\n",
907                                dev->name, type >> 2, stype >> 4);
908                 goto rx_dropped;
909         }
910
911         /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
912
913         if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
914             (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0)
915                 goto rx_dropped;
916         hdr = (struct ieee80211_hdr_4addr *) skb->data;
917
918         /* skb: hdr + (possibly fragmented) plaintext payload */
919
920         if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
921             (frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
922                 int flen;
923                 struct sk_buff *frag_skb =
924                         prism2_frag_cache_get(local, hdr);
925                 if (!frag_skb) {
926                         printk(KERN_DEBUG "%s: Rx cannot get skb from "
927                                "fragment cache (morefrag=%d seq=%u frag=%u)\n",
928                                dev->name, (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
929                                WLAN_GET_SEQ_SEQ(sc) >> 4, frag);
930                         goto rx_dropped;
931                 }
932
933                 flen = skb->len;
934                 if (frag != 0)
935                         flen -= hdrlen;
936
937                 if (frag_skb->tail + flen > frag_skb->end) {
938                         printk(KERN_WARNING "%s: host decrypted and "
939                                "reassembled frame did not fit skb\n",
940                                dev->name);
941                         prism2_frag_cache_invalidate(local, hdr);
942                         goto rx_dropped;
943                 }
944
945                 if (frag == 0) {
946                         /* copy first fragment (including full headers) into
947                          * beginning of the fragment cache skb */
948                         skb_copy_from_linear_data(skb, skb_put(frag_skb, flen),
949                                                   flen);
950                 } else {
951                         /* append frame payload to the end of the fragment
952                          * cache skb */
953                         skb_copy_from_linear_data_offset(skb, hdrlen,
954                                                          skb_put(frag_skb,
955                                                                  flen), flen);
956                 }
957                 dev_kfree_skb(skb);
958                 skb = NULL;
959
960                 if (fc & IEEE80211_FCTL_MOREFRAGS) {
961                         /* more fragments expected - leave the skb in fragment
962                          * cache for now; it will be delivered to upper layers
963                          * after all fragments have been received */
964                         goto rx_exit;
965                 }
966
967                 /* this was the last fragment and the frame will be
968                  * delivered, so remove skb from fragment cache */
969                 skb = frag_skb;
970                 hdr = (struct ieee80211_hdr_4addr *) skb->data;
971                 prism2_frag_cache_invalidate(local, hdr);
972         }
973
974         /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
975          * encrypted/authenticated */
976
977         if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
978             hostap_rx_frame_decrypt_msdu(local, skb, keyidx, crypt))
979                 goto rx_dropped;
980
981         hdr = (struct ieee80211_hdr_4addr *) skb->data;
982         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !local->open_wep) {
983                 if (local->ieee_802_1x &&
984                     hostap_is_eapol_frame(local, skb)) {
985                         /* pass unencrypted EAPOL frames even if encryption is
986                          * configured */
987                         PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X - passing "
988                                "unencrypted EAPOL frame\n", local->dev->name);
989                 } else {
990                         printk(KERN_DEBUG "%s: encryption configured, but RX "
991                                "frame not encrypted (SA=" MAC_FMT ")\n",
992                                local->dev->name,
993                                hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
994                                hdr->addr2[3], hdr->addr2[4], hdr->addr2[5]);
995                         goto rx_dropped;
996                 }
997         }
998
999         if (local->drop_unencrypted && !(fc & IEEE80211_FCTL_PROTECTED) &&
1000             !hostap_is_eapol_frame(local, skb)) {
1001                 if (net_ratelimit()) {
1002                         printk(KERN_DEBUG "%s: dropped unencrypted RX data "
1003                                "frame from " MAC_FMT " (drop_unencrypted=1)\n",
1004                                dev->name,
1005                                hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
1006                                hdr->addr2[3], hdr->addr2[4], hdr->addr2[5]);
1007                 }
1008                 goto rx_dropped;
1009         }
1010
1011         /* skb: hdr + (possible reassembled) full plaintext payload */
1012
1013         payload = skb->data + hdrlen;
1014         ethertype = (payload[6] << 8) | payload[7];
1015
1016         /* If IEEE 802.1X is used, check whether the port is authorized to send
1017          * the received frame. */
1018         if (local->ieee_802_1x && local->iw_mode == IW_MODE_MASTER) {
1019                 if (ethertype == ETH_P_PAE) {
1020                         PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X frame\n",
1021                                dev->name);
1022                         if (local->hostapd && local->apdev) {
1023                                 /* Send IEEE 802.1X frames to the user
1024                                  * space daemon for processing */
1025                                 prism2_rx_80211(local->apdev, skb, rx_stats,
1026                                                 PRISM2_RX_MGMT);
1027                                 local->apdevstats.rx_packets++;
1028                                 local->apdevstats.rx_bytes += skb->len;
1029                                 goto rx_exit;
1030                         }
1031                 } else if (!frame_authorized) {
1032                         printk(KERN_DEBUG "%s: dropped frame from "
1033                                "unauthorized port (IEEE 802.1X): "
1034                                "ethertype=0x%04x\n",
1035                                dev->name, ethertype);
1036                         goto rx_dropped;
1037                 }
1038         }
1039
1040         /* convert hdr + possible LLC headers into Ethernet header */
1041         if (skb->len - hdrlen >= 8 &&
1042             ((memcmp(payload, rfc1042_header, 6) == 0 &&
1043               ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1044              memcmp(payload, bridge_tunnel_header, 6) == 0)) {
1045                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1046                  * replace EtherType */
1047                 skb_pull(skb, hdrlen + 6);
1048                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1049                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1050         } else {
1051                 __be16 len;
1052                 /* Leave Ethernet header part of hdr and full payload */
1053                 skb_pull(skb, hdrlen);
1054                 len = htons(skb->len);
1055                 memcpy(skb_push(skb, 2), &len, 2);
1056                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1057                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1058         }
1059
1060         if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
1061                     IEEE80211_FCTL_TODS) &&
1062             skb->len >= ETH_HLEN + ETH_ALEN) {
1063                 /* Non-standard frame: get addr4 from its bogus location after
1064                  * the payload */
1065                 skb_copy_from_linear_data_offset(skb, skb->len - ETH_ALEN,
1066                                                  skb->data + ETH_ALEN,
1067                                                  ETH_ALEN);
1068                 skb_trim(skb, skb->len - ETH_ALEN);
1069         }
1070
1071         stats->rx_packets++;
1072         stats->rx_bytes += skb->len;
1073
1074         if (local->iw_mode == IW_MODE_MASTER && !wds &&
1075             local->ap->bridge_packets) {
1076                 if (dst[0] & 0x01) {
1077                         /* copy multicast frame both to the higher layers and
1078                          * to the wireless media */
1079                         local->ap->bridged_multicast++;
1080                         skb2 = skb_clone(skb, GFP_ATOMIC);
1081                         if (skb2 == NULL)
1082                                 printk(KERN_DEBUG "%s: skb_clone failed for "
1083                                        "multicast frame\n", dev->name);
1084                 } else if (hostap_is_sta_authorized(local->ap, dst)) {
1085                         /* send frame directly to the associated STA using
1086                          * wireless media and not passing to higher layers */
1087                         local->ap->bridged_unicast++;
1088                         skb2 = skb;
1089                         skb = NULL;
1090                 }
1091         }
1092
1093         if (skb2 != NULL) {
1094                 /* send to wireless media */
1095                 skb2->dev = dev;
1096                 skb2->protocol = __constant_htons(ETH_P_802_3);
1097                 skb_reset_mac_header(skb2);
1098                 skb_reset_network_header(skb2);
1099                 /* skb2->network_header += ETH_HLEN; */
1100                 dev_queue_xmit(skb2);
1101         }
1102
1103         if (skb) {
1104                 skb->protocol = eth_type_trans(skb, dev);
1105                 memset(skb->cb, 0, sizeof(skb->cb));
1106                 netif_rx(skb);
1107         }
1108
1109  rx_exit:
1110         if (sta)
1111                 hostap_handle_sta_release(sta);
1112         return;
1113
1114  rx_dropped:
1115         dev_kfree_skb(skb);
1116
1117         stats->rx_dropped++;
1118         goto rx_exit;
1119 }
1120
1121
1122 EXPORT_SYMBOL(hostap_80211_rx);