2 * Original code based Host AP (software wireless LAN access point) driver
3 * for Intersil Prism2/2.5/3 - hostap.o module, common routines
5 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
7 * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
8 * Copyright (c) 2004, Intel Corporation
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
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>
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/netdevice.h>
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>
37 #include <net/ieee80211.h>
39 static inline void ieee80211_monitor_rx(struct ieee80211_device
*ieee
,
41 struct ieee80211_rx_stats
*rx_stats
)
43 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
44 u16 fc
= le16_to_cpu(hdr
->frame_ctl
);
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
));
55 /* Called only as a tasklet (software IRQ) */
56 static struct ieee80211_frag_entry
*ieee80211_frag_cache_find(struct
64 struct ieee80211_frag_entry
*entry
;
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
)) {
71 IEEE80211_DEBUG_FRAG("expiring fragment cache entry "
72 "seq=%u last_frag=%u\n",
73 entry
->seq
, entry
->last_frag
);
74 dev_kfree_skb_any(entry
->skb
);
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)
88 /* Called only as a tasklet (software IRQ) */
89 static struct sk_buff
*ieee80211_frag_cache_get(struct ieee80211_device
*ieee
,
90 struct ieee80211_hdr
*hdr
)
92 struct sk_buff
*skb
= NULL
;
94 unsigned int frag
, seq
;
95 struct ieee80211_frag_entry
*entry
;
97 sc
= le16_to_cpu(hdr
->seq_ctl
);
98 frag
= WLAN_GET_SEQ_FRAG(sc
);
99 seq
= WLAN_GET_SEQ_SEQ(sc
);
102 /* Reserve enough space to fit maximum frame length */
103 skb
= dev_alloc_skb(ieee
->dev
->mtu
+
104 sizeof(struct ieee80211_hdr
) +
107 8 /* WEP */ + ETH_ALEN
/* WDS */ );
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;
116 if (entry
->skb
!= NULL
)
117 dev_kfree_skb_any(entry
->skb
);
119 entry
->first_frag_time
= jiffies
;
121 entry
->last_frag
= frag
;
123 memcpy(entry
->src_addr
, hdr
->addr2
, ETH_ALEN
);
124 memcpy(entry
->dst_addr
, hdr
->addr1
, ETH_ALEN
);
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
,
131 entry
->last_frag
= frag
;
139 /* Called only as a tasklet (software IRQ) */
140 static int ieee80211_frag_cache_invalidate(struct ieee80211_device
*ieee
,
141 struct ieee80211_hdr
*hdr
)
145 struct ieee80211_frag_entry
*entry
;
147 sc
= le16_to_cpu(hdr
->seq_ctl
);
148 seq
= WLAN_GET_SEQ_SEQ(sc
);
150 entry
= ieee80211_frag_cache_find(ieee
, seq
, -1, hdr
->addr2
,
154 IEEE80211_DEBUG_FRAG("could not invalidate fragment cache "
155 "entry (seq=%u)\n", seq
);
164 /* ieee80211_rx_frame_mgtmt
166 * Responsible for handling management control frames
168 * Called by ieee80211_rx */
170 ieee80211_rx_frame_mgmt(struct ieee80211_device
*ieee
, struct sk_buff
*skb
,
171 struct ieee80211_rx_stats
*rx_stats
, u16 type
,
174 if (ieee
->iw_mode
== IW_MODE_MASTER
) {
175 printk(KERN_DEBUG
"%s: Master mode not yet suppported.\n",
179 hostap_update_sta_ps(ieee, (struct hostap_ieee80211_hdr *)
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
);
191 hostap_rx(skb2
->dev
, skb2
, rx_stats
);
194 /* send management frames to the user space daemon for
196 ieee
->apdevstats
.rx_packets
++;
197 ieee
->apdevstats
.rx_bytes
+= skb
->len
;
198 prism2_rx_80211(ieee
->apdev
, skb
, rx_stats
, PRISM2_RX_MGMT
);
202 if (ieee
->iw_mode
== IW_MODE_MASTER
) {
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
);
210 hostap_rx(skb
->dev
, skb
, rx_stats
);
214 printk(KERN_DEBUG
"%s: hostap_rx_frame_mgmt: management frame "
215 "received in non-Host AP mode\n", skb
->dev
->name
);
220 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
221 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
222 static unsigned char rfc1042_header
[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
224 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
225 static unsigned char bridge_tunnel_header
[] =
226 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
227 /* No encapsulation header if EtherType < 0x600 (=length) */
229 /* Called by ieee80211_rx_frame_decrypt */
230 static int ieee80211_is_eapol_frame(struct ieee80211_device
*ieee
,
233 struct net_device
*dev
= ieee
->dev
;
235 struct ieee80211_hdr
*hdr
;
241 hdr
= (struct ieee80211_hdr
*)skb
->data
;
242 fc
= le16_to_cpu(hdr
->frame_ctl
);
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 */
257 if (skb
->len
< 24 + 8)
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
)
269 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
271 ieee80211_rx_frame_decrypt(struct ieee80211_device
*ieee
, struct sk_buff
*skb
,
272 struct ieee80211_crypt_data
*crypt
)
274 struct ieee80211_hdr
*hdr
;
277 if (crypt
== NULL
|| crypt
->ops
->decrypt_mpdu
== NULL
)
280 hdr
= (struct ieee80211_hdr
*)skb
->data
;
281 hdrlen
= ieee80211_get_hdrlen(le16_to_cpu(hdr
->frame_ctl
));
283 #ifdef CONFIG_IEEE80211_CRYPT_TKIP
284 if (ieee
->tkip_countermeasures
&& strcmp(crypt
->ops
->name
, "TKIP") == 0) {
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
));
294 atomic_inc(&crypt
->refcnt
);
295 res
= crypt
->ops
->decrypt_mpdu(skb
, hdrlen
, crypt
->priv
);
296 atomic_dec(&crypt
->refcnt
);
298 IEEE80211_DEBUG_DROP("decryption failed (SA=" MAC_FMT
299 ") res=%d\n", MAC_ARG(hdr
->addr2
), res
);
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
++;
311 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
313 ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device
*ieee
,
314 struct sk_buff
*skb
, int keyidx
,
315 struct ieee80211_crypt_data
*crypt
)
317 struct ieee80211_hdr
*hdr
;
320 if (crypt
== NULL
|| crypt
->ops
->decrypt_msdu
== NULL
)
323 hdr
= (struct ieee80211_hdr
*)skb
->data
;
324 hdrlen
= ieee80211_get_hdrlen(le16_to_cpu(hdr
->frame_ctl
));
326 atomic_inc(&crypt
->refcnt
);
327 res
= crypt
->ops
->decrypt_msdu(skb
, keyidx
, hdrlen
, crypt
->priv
);
328 atomic_dec(&crypt
->refcnt
);
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
);
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
)
345 struct net_device
*dev
= ieee
->dev
;
346 struct ieee80211_hdr
*hdr
;
348 u16 fc
, type
, stype
, sc
;
349 struct net_device_stats
*stats
;
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;
363 struct ieee80211_crypt_data
*crypt
= NULL
;
366 hdr
= (struct ieee80211_hdr
*)skb
->data
;
367 stats
= &ieee
->stats
;
370 printk(KERN_INFO
"%s: SKB length < 10\n", dev
->name
);
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
);
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
);
395 #endif /* IW_WIRELESS_SPY */
396 #endif /* WIRELESS_EXT > 15 */
397 hostap_update_rx_stats(local
->ap
, hdr
, rx_stats
);
400 #if WIRELESS_EXT > 15
401 if (ieee
->iw_mode
== IW_MODE_MONITOR
) {
402 ieee80211_monitor_rx(ieee
, skb
, rx_stats
);
404 stats
->rx_bytes
+= skb
->len
;
409 if (ieee
->host_decrypt
) {
411 if (skb
->len
>= hdrlen
+ 3)
412 idx
= skb
->data
[hdrlen
+ 3] >> 6;
413 crypt
= ieee
->crypt
[idx
];
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). */
424 if (!(hdr
->addr1
[0] & 0x01) || local
->bcrx_sta_key
)
425 (void)hostap_handle_sta_crypto(local
, hdr
, &crypt
,
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
))
435 if (!crypt
&& (fc
& IEEE80211_FCTL_PROTECTED
)) {
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
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
++;
448 if (type
!= WLAN_FC_TYPE_DATA
) {
449 if (type
== WLAN_FC_TYPE_MGMT
&& stype
== WLAN_FC_STYPE_AUTH
&&
450 fc
& IEEE80211_FCTL_PROTECTED
&& ieee
->host_decrypt
&&
451 (keyidx
= hostap_rx_frame_decrypt(ieee
, skb
, crypt
)) < 0) {
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 */
460 if (ieee80211_rx_frame_mgmt(ieee
, skb
, rx_stats
, type
, stype
))
467 /* Data frame - extract src/dst addresses */
468 if (skb
->len
< IEEE80211_3ADDR_LEN
)
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
);
476 case IEEE80211_FCTL_TODS
:
477 memcpy(dst
, hdr
->addr3
, ETH_ALEN
);
478 memcpy(src
, hdr
->addr2
, ETH_ALEN
);
480 case IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
:
481 if (skb
->len
< IEEE80211_4ADDR_LEN
)
483 memcpy(dst
, hdr
->addr3
, ETH_ALEN
);
484 memcpy(src
, hdr
->addr4
, ETH_ALEN
);
487 memcpy(dst
, hdr
->addr1
, ETH_ALEN
);
488 memcpy(src
, hdr
->addr2
, ETH_ALEN
);
493 if (hostap_rx_frame_wds(ieee
, hdr
, fc
, &wds
))
496 skb
->dev
= dev
= wds
;
497 stats
= hostap_get_stats(dev
);
500 if (ieee
->iw_mode
== IW_MODE_MASTER
&& !wds
&&
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) {
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
);
511 dev
->last_rx
= jiffies
;
514 if ((ieee
->iw_mode
== IW_MODE_MASTER
||
515 ieee
->iw_mode
== IW_MODE_REPEAT
) && !from_assoc_ap
) {
516 switch (hostap_handle_sta_rx(ieee
, dev
, skb
, rx_stats
,
518 case AP_RX_CONTINUE_NOT_AUTHORIZED
:
519 frame_authorized
= 0;
522 frame_authorized
= 1;
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
)
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
);
546 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
548 if (ieee
->host_decrypt
&& (fc
& IEEE80211_FCTL_PROTECTED
) &&
549 (keyidx
= ieee80211_rx_frame_decrypt(ieee
, skb
, crypt
)) < 0)
552 hdr
= (struct ieee80211_hdr
*)skb
->data
;
554 /* skb: hdr + (possibly fragmented) plaintext payload */
555 // PR: FIXME: hostap has additional conditions in the "if" below:
556 // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
557 if ((frag
!= 0 || (fc
& IEEE80211_FCTL_MOREFRAGS
))) {
559 struct sk_buff
*frag_skb
= ieee80211_frag_cache_get(ieee
, hdr
);
560 IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag
);
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
);
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",
579 ieee80211_frag_cache_invalidate(ieee
, hdr
);
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
);
588 /* append frame payload to the end of the fragment
590 memcpy(skb_put(frag_skb
, flen
), skb
->data
+ hdrlen
,
593 dev_kfree_skb_any(skb
);
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 */
603 /* this was the last fragment and the frame will be
604 * delivered, so remove skb from fragment cache */
606 hdr
= (struct ieee80211_hdr
*)skb
->data
;
607 ieee80211_frag_cache_invalidate(ieee
, hdr
);
610 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
611 * encrypted/authenticated */
612 if (ieee
->host_decrypt
&& (fc
& IEEE80211_FCTL_PROTECTED
) &&
613 ieee80211_rx_frame_decrypt_msdu(ieee
, skb
, keyidx
, crypt
))
616 hdr
= (struct ieee80211_hdr
*)skb
->data
;
617 if (crypt
&& !(fc
& IEEE80211_FCTL_PROTECTED
) && !ieee
->open_wep
) {
618 if ( /*ieee->ieee802_1x && */
619 ieee80211_is_eapol_frame(ieee
, skb
)) {
620 /* pass unencrypted EAPOL frames even if encryption is
623 IEEE80211_DEBUG_DROP("encryption configured, but RX "
624 "frame not encrypted (SA=" MAC_FMT
625 ")\n", MAC_ARG(hdr
->addr2
));
630 if (crypt
&& !(fc
& IEEE80211_FCTL_PROTECTED
) && !ieee
->open_wep
&&
631 !ieee80211_is_eapol_frame(ieee
, skb
)) {
632 IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
633 "frame from " MAC_FMT
634 " (drop_unencrypted=1)\n",
635 MAC_ARG(hdr
->addr2
));
639 /* skb: hdr + (possible reassembled) full plaintext payload */
641 payload
= skb
->data
+ hdrlen
;
642 ethertype
= (payload
[6] << 8) | payload
[7];
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",
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
,
656 ieee
->apdevstats
.rx_packets
++;
657 ieee
->apdevstats
.rx_bytes
+= skb
->len
;
660 } else if (!frame_authorized
) {
661 printk(KERN_DEBUG
"%s: dropped frame from "
662 "unauthorized port (IEEE 802.1X): "
663 "ethertype=0x%04x\n", dev
->name
, ethertype
);
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
);
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
);
690 if (wds
&& ((fc
& (IEEE80211_FCTL_TODS
| IEEE80211_FCTL_FROMDS
)) ==
691 IEEE80211_FCTL_TODS
) && skb
->len
>= ETH_HLEN
+ ETH_ALEN
) {
692 /* Non-standard frame: get addr4 from its bogus location after
694 memcpy(skb
->data
+ ETH_ALEN
,
695 skb
->data
+ skb
->len
- ETH_ALEN
, ETH_ALEN
);
696 skb_trim(skb
, skb
->len
- ETH_ALEN
);
701 stats
->rx_bytes
+= skb
->len
;
704 if (ieee
->iw_mode
== IW_MODE_MASTER
&& !wds
&& ieee
->ap
->bridge_packets
) {
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
);
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
++;
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; */
728 dev_queue_xmit(skb2
);
733 skb
->protocol
= eth_type_trans(skb
, dev
);
734 memset(skb
->cb
, 0, sizeof(skb
->cb
));
736 skb
->ip_summed
= CHECKSUM_NONE
; /* 802.11 crc not sufficient */
743 hostap_handle_sta_release(sta
);
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 */
756 #define MGMT_FRAME_FIXED_PART_LENGTH 0x24
758 static inline int ieee80211_is_ofdm_rate(u8 rate
)
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
:
774 static inline int ieee80211_network_init(struct ieee80211_device
*ieee
,
775 struct ieee80211_probe_response
777 struct ieee80211_network
*network
,
778 struct ieee80211_rx_stats
*stats
)
780 #ifdef CONFIG_IEEE80211_DEBUG
784 struct ieee80211_info_element
*info_element
;
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
;
795 /* Where to pull this? beacon->listen_interval; */
796 network
->listen_interval
= 0x0A;
797 network
->rates_len
= network
->rates_ex_len
= 0;
798 network
->last_associate
= 0;
799 network
->ssid_len
= 0;
801 network
->atim_window
= 0;
803 if (stats
->freq
== IEEE80211_52GHZ_BAND
) {
804 /* for A band (No DS info) */
805 network
->channel
= stats
->received_channel
;
807 network
->flags
|= NETWORK_HAS_CCK
;
809 network
->wpa_ie_len
= 0;
810 network
->rsn_ie_len
= 0;
812 info_element
= &beacon
->info_element
;
813 left
= stats
->len
- ((void *)info_element
- (void *)beacon
);
814 while (left
>= sizeof(struct ieee80211_info_element_hdr
)) {
815 if (sizeof(struct ieee80211_info_element_hdr
) +
816 info_element
->len
> left
) {
818 ("SCAN: parse failed: info_element->len + 2 > left : info_element->len+2=%Zd left=%d.\n",
820 sizeof(struct ieee80211_info_element
), left
);
824 switch (info_element
->id
) {
826 if (ieee80211_is_empty_essid(info_element
->data
,
827 info_element
->len
)) {
828 network
->flags
|= NETWORK_EMPTY_ESSID
;
832 network
->ssid_len
= min(info_element
->len
,
833 (u8
) IW_ESSID_MAX_SIZE
);
834 memcpy(network
->ssid
, info_element
->data
,
836 if (network
->ssid_len
< IW_ESSID_MAX_SIZE
)
837 memset(network
->ssid
+ network
->ssid_len
, 0,
838 IW_ESSID_MAX_SIZE
- network
->ssid_len
);
840 IEEE80211_DEBUG_SCAN("MFIE_TYPE_SSID: '%s' len=%d.\n",
841 network
->ssid
, network
->ssid_len
);
844 case MFIE_TYPE_RATES
:
845 #ifdef CONFIG_IEEE80211_DEBUG
849 min(info_element
->len
, MAX_RATES_LENGTH
);
850 for (i
= 0; i
< network
->rates_len
; i
++) {
851 network
->rates
[i
] = info_element
->data
[i
];
852 #ifdef CONFIG_IEEE80211_DEBUG
854 sizeof(rates_str
) - (p
-
856 "%02X ", network
->rates
[i
]);
858 if (ieee80211_is_ofdm_rate
859 (info_element
->data
[i
])) {
860 network
->flags
|= NETWORK_HAS_OFDM
;
861 if (info_element
->data
[i
] &
862 IEEE80211_BASIC_RATE_MASK
)
868 IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES: '%s' (%d)\n",
869 rates_str
, network
->rates_len
);
872 case MFIE_TYPE_RATES_EX
:
873 #ifdef CONFIG_IEEE80211_DEBUG
876 network
->rates_ex_len
=
877 min(info_element
->len
, MAX_RATES_EX_LENGTH
);
878 for (i
= 0; i
< network
->rates_ex_len
; i
++) {
879 network
->rates_ex
[i
] = info_element
->data
[i
];
880 #ifdef CONFIG_IEEE80211_DEBUG
882 sizeof(rates_str
) - (p
-
884 "%02X ", network
->rates
[i
]);
886 if (ieee80211_is_ofdm_rate
887 (info_element
->data
[i
])) {
888 network
->flags
|= NETWORK_HAS_OFDM
;
889 if (info_element
->data
[i
] &
890 IEEE80211_BASIC_RATE_MASK
)
896 IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
897 rates_str
, network
->rates_ex_len
);
900 case MFIE_TYPE_DS_SET
:
901 IEEE80211_DEBUG_SCAN("MFIE_TYPE_DS_SET: %d\n",
902 info_element
->data
[0]);
903 if (stats
->freq
== IEEE80211_24GHZ_BAND
)
904 network
->channel
= info_element
->data
[0];
907 case MFIE_TYPE_FH_SET
:
908 IEEE80211_DEBUG_SCAN("MFIE_TYPE_FH_SET: ignored\n");
911 case MFIE_TYPE_CF_SET
:
912 IEEE80211_DEBUG_SCAN("MFIE_TYPE_CF_SET: ignored\n");
916 IEEE80211_DEBUG_SCAN("MFIE_TYPE_TIM: ignored\n");
919 case MFIE_TYPE_IBSS_SET
:
920 IEEE80211_DEBUG_SCAN("MFIE_TYPE_IBSS_SET: ignored\n");
923 case MFIE_TYPE_CHALLENGE
:
924 IEEE80211_DEBUG_SCAN("MFIE_TYPE_CHALLENGE: ignored\n");
927 case MFIE_TYPE_GENERIC
:
928 IEEE80211_DEBUG_SCAN("MFIE_TYPE_GENERIC: %d bytes\n",
930 if (info_element
->len
>= 4 &&
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,
937 memcpy(network
->wpa_ie
, info_element
,
938 network
->wpa_ie_len
);
943 IEEE80211_DEBUG_SCAN("MFIE_TYPE_RSN: %d bytes\n",
945 network
->rsn_ie_len
= min(info_element
->len
+ 2,
947 memcpy(network
->rsn_ie
, info_element
,
948 network
->rsn_ie_len
);
952 IEEE80211_DEBUG_SCAN("unsupported IE %d\n",
957 left
-= sizeof(struct ieee80211_info_element_hdr
) +
959 info_element
= (struct ieee80211_info_element
*)
960 &info_element
->data
[info_element
->len
];
964 if (stats
->freq
== IEEE80211_52GHZ_BAND
)
965 network
->mode
= IEEE_A
;
967 if (network
->flags
& NETWORK_HAS_OFDM
)
968 network
->mode
|= IEEE_G
;
969 if (network
->flags
& NETWORK_HAS_CCK
)
970 network
->mode
|= IEEE_B
;
973 if (network
->mode
== 0) {
974 IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT
")' "
976 escape_essid(network
->ssid
,
978 MAC_ARG(network
->bssid
));
982 if (ieee80211_is_empty_essid(network
->ssid
, network
->ssid_len
))
983 network
->flags
|= NETWORK_EMPTY_ESSID
;
985 memcpy(&network
->stats
, stats
, sizeof(network
->stats
));
990 static inline int is_same_network(struct ieee80211_network
*src
,
991 struct ieee80211_network
*dst
)
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
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
));
1002 static inline void update_network(struct ieee80211_network
*dst
,
1003 struct ieee80211_network
*src
)
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
;
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];
1017 dst
->beacon_interval
= src
->beacon_interval
;
1018 dst
->listen_interval
= src
->listen_interval
;
1019 dst
->atim_window
= src
->atim_window
;
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
;
1026 dst
->last_scanned
= jiffies
;
1027 /* dst->last_associate is not overwritten */
1030 static inline void ieee80211_process_probe_response(struct ieee80211_device
1033 ieee80211_probe_response
1035 struct ieee80211_rx_stats
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
;
1044 unsigned long flags
;
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
,
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');
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
,
1072 MAC_ARG(beacon
->header
.addr3
),
1073 WLAN_FC_GET_STYPE(beacon
->header
.
1075 IEEE80211_STYPE_PROBE_RESP
?
1076 "PROBE RESPONSE" : "BEACON");
1080 /* The network parsed correctly -- so now we scan our known networks
1081 * to see if we can find it in our list.
1083 * NOTE: This search is definitely not optimized. Once its doing
1084 * the "right thing" we'll optimize it for efficiency if
1087 /* Search for this entry in the list and update it if it is
1090 spin_lock_irqsave(&ieee
->lock
, flags
);
1092 list_for_each_entry(target
, &ieee
->network_list
, list
) {
1093 if (is_same_network(target
, &network
))
1096 if ((oldest
== NULL
) ||
1097 (target
->last_scanned
< oldest
->last_scanned
))
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
);
1108 IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT
") from "
1110 escape_essid(target
->ssid
,
1112 MAC_ARG(target
->bssid
));
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
);
1120 #ifdef CONFIG_IEEE80211_DEBUG
1121 IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT
") via %s.\n",
1122 escape_essid(network
.ssid
,
1124 MAC_ARG(network
.bssid
),
1125 WLAN_FC_GET_STYPE(beacon
->header
.
1127 IEEE80211_STYPE_PROBE_RESP
?
1128 "PROBE RESPONSE" : "BEACON");
1130 memcpy(target
, &network
, sizeof(*target
));
1131 list_add_tail(&target
->list
, &ieee
->network_list
);
1133 IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT
") via %s.\n",
1134 escape_essid(target
->ssid
,
1136 MAC_ARG(target
->bssid
),
1137 WLAN_FC_GET_STYPE(beacon
->header
.
1139 IEEE80211_STYPE_PROBE_RESP
?
1140 "PROBE RESPONSE" : "BEACON");
1141 update_network(target
, &network
);
1144 spin_unlock_irqrestore(&ieee
->lock
, flags
);
1147 void ieee80211_rx_mgt(struct ieee80211_device
*ieee
,
1148 struct ieee80211_hdr
*header
,
1149 struct ieee80211_rx_stats
*stats
)
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
));
1157 case IEEE80211_STYPE_REASSOC_RESP
:
1158 IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1159 WLAN_FC_GET_STYPE(header
->frame_ctl
));
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");
1166 ieee80211_process_probe_response(ieee
,
1168 ieee80211_probe_response
*)
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");
1176 ieee80211_process_probe_response(ieee
,
1178 ieee80211_probe_response
*)
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",
1187 WLAN_FC_GET_STYPE(header
->frame_ctl
));
1192 EXPORT_SYMBOL(ieee80211_rx_mgt
);
1193 EXPORT_SYMBOL(ieee80211_rx
);