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Diffstat (limited to 'drivers/net/wireless/bcm43xx/bcm43xx_xmit.c')
-rw-r--r--drivers/net/wireless/bcm43xx/bcm43xx_xmit.c582
1 files changed, 582 insertions, 0 deletions
diff --git a/drivers/net/wireless/bcm43xx/bcm43xx_xmit.c b/drivers/net/wireless/bcm43xx/bcm43xx_xmit.c
new file mode 100644
index 000000000000..d8ece28c079f
--- /dev/null
+++ b/drivers/net/wireless/bcm43xx/bcm43xx_xmit.c
@@ -0,0 +1,582 @@
1/*
2
3 Broadcom BCM43xx wireless driver
4
5 Transmission (TX/RX) related functions.
6
7 Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>,
8 Stefano Brivio <st3@riseup.net>
9 Michael Buesch <mbuesch@freenet.de>
10 Danny van Dyk <kugelfang@gentoo.org>
11 Andreas Jaggi <andreas.jaggi@waterwave.ch>
12
13 This program is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2 of the License, or
16 (at your option) any later version.
17
18 This program is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 GNU General Public License for more details.
22
23 You should have received a copy of the GNU General Public License
24 along with this program; see the file COPYING. If not, write to
25 the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
26 Boston, MA 02110-1301, USA.
27
28*/
29
30#include "bcm43xx_xmit.h"
31
32#include <linux/etherdevice.h>
33
34
35/* Extract the bitrate out of a CCK PLCP header. */
36static u8 bcm43xx_plcp_get_bitrate_cck(struct bcm43xx_plcp_hdr4 *plcp)
37{
38 switch (plcp->raw[0]) {
39 case 0x0A:
40 return IEEE80211_CCK_RATE_1MB;
41 case 0x14:
42 return IEEE80211_CCK_RATE_2MB;
43 case 0x37:
44 return IEEE80211_CCK_RATE_5MB;
45 case 0x6E:
46 return IEEE80211_CCK_RATE_11MB;
47 }
48 assert(0);
49 return 0;
50}
51
52/* Extract the bitrate out of an OFDM PLCP header. */
53static u8 bcm43xx_plcp_get_bitrate_ofdm(struct bcm43xx_plcp_hdr4 *plcp)
54{
55 switch (plcp->raw[0] & 0xF) {
56 case 0xB:
57 return IEEE80211_OFDM_RATE_6MB;
58 case 0xF:
59 return IEEE80211_OFDM_RATE_9MB;
60 case 0xA:
61 return IEEE80211_OFDM_RATE_12MB;
62 case 0xE:
63 return IEEE80211_OFDM_RATE_18MB;
64 case 0x9:
65 return IEEE80211_OFDM_RATE_24MB;
66 case 0xD:
67 return IEEE80211_OFDM_RATE_36MB;
68 case 0x8:
69 return IEEE80211_OFDM_RATE_48MB;
70 case 0xC:
71 return IEEE80211_OFDM_RATE_54MB;
72 }
73 assert(0);
74 return 0;
75}
76
77u8 bcm43xx_plcp_get_ratecode_cck(const u8 bitrate)
78{
79 switch (bitrate) {
80 case IEEE80211_CCK_RATE_1MB:
81 return 0x0A;
82 case IEEE80211_CCK_RATE_2MB:
83 return 0x14;
84 case IEEE80211_CCK_RATE_5MB:
85 return 0x37;
86 case IEEE80211_CCK_RATE_11MB:
87 return 0x6E;
88 }
89 assert(0);
90 return 0;
91}
92
93u8 bcm43xx_plcp_get_ratecode_ofdm(const u8 bitrate)
94{
95 switch (bitrate) {
96 case IEEE80211_OFDM_RATE_6MB:
97 return 0xB;
98 case IEEE80211_OFDM_RATE_9MB:
99 return 0xF;
100 case IEEE80211_OFDM_RATE_12MB:
101 return 0xA;
102 case IEEE80211_OFDM_RATE_18MB:
103 return 0xE;
104 case IEEE80211_OFDM_RATE_24MB:
105 return 0x9;
106 case IEEE80211_OFDM_RATE_36MB:
107 return 0xD;
108 case IEEE80211_OFDM_RATE_48MB:
109 return 0x8;
110 case IEEE80211_OFDM_RATE_54MB:
111 return 0xC;
112 }
113 assert(0);
114 return 0;
115}
116
117static void bcm43xx_generate_plcp_hdr(struct bcm43xx_plcp_hdr4 *plcp,
118 const u16 octets, const u8 bitrate,
119 const int ofdm_modulation)
120{
121 __le32 *data = &(plcp->data);
122 __u8 *raw = plcp->raw;
123
124 if (ofdm_modulation) {
125 *data = bcm43xx_plcp_get_ratecode_ofdm(bitrate);
126 assert(!(octets & 0xF000));
127 *data |= (octets << 5);
128 *data = cpu_to_le32(*data);
129 } else {
130 u32 plen;
131
132 plen = octets * 16 / bitrate;
133 if ((octets * 16 % bitrate) > 0) {
134 plen++;
135 if ((bitrate == IEEE80211_CCK_RATE_11MB)
136 && ((octets * 8 % 11) < 4)) {
137 raw[1] = 0x84;
138 } else
139 raw[1] = 0x04;
140 } else
141 raw[1] = 0x04;
142 *data |= cpu_to_le32(plen << 16);
143 raw[0] = bcm43xx_plcp_get_ratecode_cck(bitrate);
144 }
145}
146
147static u8 bcm43xx_calc_fallback_rate(u8 bitrate)
148{
149 switch (bitrate) {
150 case IEEE80211_CCK_RATE_1MB:
151 return IEEE80211_CCK_RATE_1MB;
152 case IEEE80211_CCK_RATE_2MB:
153 return IEEE80211_CCK_RATE_1MB;
154 case IEEE80211_CCK_RATE_5MB:
155 return IEEE80211_CCK_RATE_2MB;
156 case IEEE80211_CCK_RATE_11MB:
157 return IEEE80211_CCK_RATE_5MB;
158 case IEEE80211_OFDM_RATE_6MB:
159 return IEEE80211_CCK_RATE_5MB;
160 case IEEE80211_OFDM_RATE_9MB:
161 return IEEE80211_OFDM_RATE_6MB;
162 case IEEE80211_OFDM_RATE_12MB:
163 return IEEE80211_OFDM_RATE_9MB;
164 case IEEE80211_OFDM_RATE_18MB:
165 return IEEE80211_OFDM_RATE_12MB;
166 case IEEE80211_OFDM_RATE_24MB:
167 return IEEE80211_OFDM_RATE_18MB;
168 case IEEE80211_OFDM_RATE_36MB:
169 return IEEE80211_OFDM_RATE_24MB;
170 case IEEE80211_OFDM_RATE_48MB:
171 return IEEE80211_OFDM_RATE_36MB;
172 case IEEE80211_OFDM_RATE_54MB:
173 return IEEE80211_OFDM_RATE_48MB;
174 }
175 assert(0);
176 return 0;
177}
178
179static
180__le16 bcm43xx_calc_duration_id(const struct ieee80211_hdr *wireless_header,
181 u8 bitrate)
182{
183 const u16 frame_ctl = le16_to_cpu(wireless_header->frame_ctl);
184 __le16 duration_id = wireless_header->duration_id;
185
186 switch (WLAN_FC_GET_TYPE(frame_ctl)) {
187 case IEEE80211_FTYPE_DATA:
188 case IEEE80211_FTYPE_MGMT:
189 //TODO: Steal the code from ieee80211, once it is completed there.
190 break;
191 case IEEE80211_FTYPE_CTL:
192 /* Use the original duration/id. */
193 break;
194 default:
195 assert(0);
196 }
197
198 return duration_id;
199}
200
201static inline
202u16 ceiling_div(u16 dividend, u16 divisor)
203{
204 return ((dividend + divisor - 1) / divisor);
205}
206
207static void bcm43xx_generate_rts(const struct bcm43xx_phyinfo *phy,
208 struct bcm43xx_txhdr *txhdr,
209 u16 *flags,
210 u8 bitrate,
211 const struct ieee80211_hdr_4addr *wlhdr)
212{
213 u16 fctl;
214 u16 dur;
215 u8 fallback_bitrate;
216 int ofdm_modulation;
217 int fallback_ofdm_modulation;
218// u8 *sa, *da;
219 u16 flen;
220
221//FIXME sa = ieee80211_get_SA((struct ieee80211_hdr *)wlhdr);
222//FIXME da = ieee80211_get_DA((struct ieee80211_hdr *)wlhdr);
223 fallback_bitrate = bcm43xx_calc_fallback_rate(bitrate);
224 ofdm_modulation = !(ieee80211_is_cck_rate(bitrate));
225 fallback_ofdm_modulation = !(ieee80211_is_cck_rate(fallback_bitrate));
226
227 flen = sizeof(u16) + sizeof(u16) + ETH_ALEN + ETH_ALEN + IEEE80211_FCS_LEN,
228 bcm43xx_generate_plcp_hdr((struct bcm43xx_plcp_hdr4 *)(&txhdr->rts_cts_plcp),
229 flen, bitrate,
230 !ieee80211_is_cck_rate(bitrate));
231 bcm43xx_generate_plcp_hdr((struct bcm43xx_plcp_hdr4 *)(&txhdr->rts_cts_fallback_plcp),
232 flen, fallback_bitrate,
233 !ieee80211_is_cck_rate(fallback_bitrate));
234 fctl = IEEE80211_FTYPE_CTL;
235 fctl |= IEEE80211_STYPE_RTS;
236 dur = le16_to_cpu(wlhdr->duration_id);
237/*FIXME: should we test for dur==0 here and let it unmodified in this case?
238 * The following assert checks for this case...
239 */
240assert(dur);
241/*FIXME: The duration calculation is not really correct.
242 * I am not 100% sure which bitrate to use. We use the RTS rate here,
243 * but this is likely to be wrong.
244 */
245 if (phy->type == BCM43xx_PHYTYPE_A) {
246 /* Three times SIFS */
247 dur += 16 * 3;
248 /* Add ACK duration. */
249 dur += ceiling_div((16 + 8 * (14 /*bytes*/) + 6) * 10,
250 bitrate * 4);
251 /* Add CTS duration. */
252 dur += ceiling_div((16 + 8 * (14 /*bytes*/) + 6) * 10,
253 bitrate * 4);
254 } else {
255 /* Three times SIFS */
256 dur += 10 * 3;
257 /* Add ACK duration. */
258 dur += ceiling_div(8 * (14 /*bytes*/) * 10,
259 bitrate);
260 /* Add CTS duration. */
261 dur += ceiling_div(8 * (14 /*bytes*/) * 10,
262 bitrate);
263 }
264
265 txhdr->rts_cts_frame_control = cpu_to_le16(fctl);
266 txhdr->rts_cts_dur = cpu_to_le16(dur);
267//printk(BCM43xx_MACFMT " " BCM43xx_MACFMT " " BCM43xx_MACFMT "\n", BCM43xx_MACARG(wlhdr->addr1), BCM43xx_MACARG(wlhdr->addr2), BCM43xx_MACARG(wlhdr->addr3));
268//printk(BCM43xx_MACFMT " " BCM43xx_MACFMT "\n", BCM43xx_MACARG(sa), BCM43xx_MACARG(da));
269 memcpy(txhdr->rts_cts_mac1, wlhdr->addr1, ETH_ALEN);//FIXME!
270// memcpy(txhdr->rts_cts_mac2, sa, ETH_ALEN);
271
272 *flags |= BCM43xx_TXHDRFLAG_RTSCTS;
273 *flags |= BCM43xx_TXHDRFLAG_RTS;
274 if (ofdm_modulation)
275 *flags |= BCM43xx_TXHDRFLAG_RTSCTS_OFDM;
276 if (fallback_ofdm_modulation)
277 *flags |= BCM43xx_TXHDRFLAG_RTSCTSFALLBACK_OFDM;
278}
279
280void bcm43xx_generate_txhdr(struct bcm43xx_private *bcm,
281 struct bcm43xx_txhdr *txhdr,
282 const unsigned char *fragment_data,
283 const unsigned int fragment_len,
284 const int is_first_fragment,
285 const u16 cookie)
286{
287 const struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
288 const struct ieee80211_hdr_4addr *wireless_header = (const struct ieee80211_hdr_4addr *)fragment_data;
289 const struct ieee80211_security *secinfo = &bcm->ieee->sec;
290 u8 bitrate;
291 u8 fallback_bitrate;
292 int ofdm_modulation;
293 int fallback_ofdm_modulation;
294 u16 plcp_fragment_len = fragment_len;
295 u16 flags = 0;
296 u16 control = 0;
297 u16 wsec_rate = 0;
298 u16 encrypt_frame;
299
300 /* Now construct the TX header. */
301 memset(txhdr, 0, sizeof(*txhdr));
302
303 bitrate = bcm->softmac->txrates.default_rate;
304 ofdm_modulation = !(ieee80211_is_cck_rate(bitrate));
305 fallback_bitrate = bcm43xx_calc_fallback_rate(bitrate);
306 fallback_ofdm_modulation = !(ieee80211_is_cck_rate(fallback_bitrate));
307
308 /* Set Frame Control from 80211 header. */
309 txhdr->frame_control = wireless_header->frame_ctl;
310 /* Copy address1 from 80211 header. */
311 memcpy(txhdr->mac1, wireless_header->addr1, 6);
312 /* Set the fallback duration ID. */
313 txhdr->fallback_dur_id = bcm43xx_calc_duration_id((const struct ieee80211_hdr *)wireless_header,
314 fallback_bitrate);
315 /* Set the cookie (used as driver internal ID for the frame) */
316 txhdr->cookie = cpu_to_le16(cookie);
317
318 /* Hardware appends FCS. */
319 plcp_fragment_len += IEEE80211_FCS_LEN;
320
321 /* Hardware encryption. */
322 encrypt_frame = le16_to_cpup(&wireless_header->frame_ctl) & IEEE80211_FCTL_PROTECTED;
323 if (encrypt_frame && !bcm->ieee->host_encrypt) {
324 const struct ieee80211_hdr_3addr *hdr = (struct ieee80211_hdr_3addr *)wireless_header;
325 memcpy(txhdr->wep_iv, hdr->payload, 4);
326 /* Hardware appends ICV. */
327 plcp_fragment_len += 4;
328
329 wsec_rate |= (bcm->key[secinfo->active_key].algorithm << BCM43xx_TXHDR_WSEC_ALGO_SHIFT)
330 & BCM43xx_TXHDR_WSEC_ALGO_MASK;
331 wsec_rate |= (secinfo->active_key << BCM43xx_TXHDR_WSEC_KEYINDEX_SHIFT)
332 & BCM43xx_TXHDR_WSEC_KEYINDEX_MASK;
333 }
334
335 /* Generate the PLCP header and the fallback PLCP header. */
336 bcm43xx_generate_plcp_hdr((struct bcm43xx_plcp_hdr4 *)(&txhdr->plcp),
337 plcp_fragment_len,
338 bitrate, ofdm_modulation);
339 bcm43xx_generate_plcp_hdr(&txhdr->fallback_plcp, plcp_fragment_len,
340 fallback_bitrate, fallback_ofdm_modulation);
341
342 /* Set the CONTROL field */
343 if (ofdm_modulation)
344 control |= BCM43xx_TXHDRCTL_OFDM;
345 if (bcm->short_preamble) //FIXME: could be the other way around, please test
346 control |= BCM43xx_TXHDRCTL_SHORT_PREAMBLE;
347 control |= (phy->antenna_diversity << BCM43xx_TXHDRCTL_ANTENNADIV_SHIFT)
348 & BCM43xx_TXHDRCTL_ANTENNADIV_MASK;
349
350 /* Set the FLAGS field */
351 if (!is_multicast_ether_addr(wireless_header->addr1) &&
352 !is_broadcast_ether_addr(wireless_header->addr1))
353 flags |= BCM43xx_TXHDRFLAG_EXPECTACK;
354 if (1 /* FIXME: PS poll?? */)
355 flags |= 0x10; // FIXME: unknown meaning.
356 if (fallback_ofdm_modulation)
357 flags |= BCM43xx_TXHDRFLAG_FALLBACKOFDM;
358 if (is_first_fragment)
359 flags |= BCM43xx_TXHDRFLAG_FIRSTFRAGMENT;
360
361 /* Set WSEC/RATE field */
362 wsec_rate |= (txhdr->plcp.raw[0] << BCM43xx_TXHDR_RATE_SHIFT)
363 & BCM43xx_TXHDR_RATE_MASK;
364
365 /* Generate the RTS/CTS packet, if required. */
366 /* FIXME: We should first try with CTS-to-self,
367 * if we are on 80211g. If we get too many
368 * failures (hidden nodes), we should switch back to RTS/CTS.
369 */
370 if (0/*FIXME txctl->use_rts_cts*/) {
371 bcm43xx_generate_rts(phy, txhdr, &flags,
372 0/*FIXME txctl->rts_cts_rate*/,
373 wireless_header);
374 }
375
376 txhdr->flags = cpu_to_le16(flags);
377 txhdr->control = cpu_to_le16(control);
378 txhdr->wsec_rate = cpu_to_le16(wsec_rate);
379}
380
381static s8 bcm43xx_rssi_postprocess(struct bcm43xx_private *bcm,
382 u8 in_rssi, int ofdm,
383 int adjust_2053, int adjust_2050)
384{
385 struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
386 struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
387 s32 tmp;
388
389 switch (radio->version) {
390 case 0x2050:
391 if (ofdm) {
392 tmp = in_rssi;
393 if (tmp > 127)
394 tmp -= 256;
395 tmp *= 73;
396 tmp /= 64;
397 if (adjust_2050)
398 tmp += 25;
399 else
400 tmp -= 3;
401 } else {
402 if (bcm->sprom.boardflags & BCM43xx_BFL_RSSI) {
403 if (in_rssi > 63)
404 in_rssi = 63;
405 tmp = radio->nrssi_lt[in_rssi];
406 tmp = 31 - tmp;
407 tmp *= -131;
408 tmp /= 128;
409 tmp -= 57;
410 } else {
411 tmp = in_rssi;
412 tmp = 31 - tmp;
413 tmp *= -149;
414 tmp /= 128;
415 tmp -= 68;
416 }
417 if (phy->type == BCM43xx_PHYTYPE_G &&
418 adjust_2050)
419 tmp += 25;
420 }
421 break;
422 case 0x2060:
423 if (in_rssi > 127)
424 tmp = in_rssi - 256;
425 else
426 tmp = in_rssi;
427 break;
428 default:
429 tmp = in_rssi;
430 tmp -= 11;
431 tmp *= 103;
432 tmp /= 64;
433 if (adjust_2053)
434 tmp -= 109;
435 else
436 tmp -= 83;
437 }
438
439 return (s8)tmp;
440}
441
442//TODO
443#if 0
444static s8 bcm43xx_rssinoise_postprocess(struct bcm43xx_private *bcm,
445 u8 in_rssi)
446{
447 struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
448 s8 ret;
449
450 if (phy->type == BCM43xx_PHYTYPE_A) {
451 //TODO: Incomplete specs.
452 ret = 0;
453 } else
454 ret = bcm43xx_rssi_postprocess(bcm, in_rssi, 0, 1, 1);
455
456 return ret;
457}
458#endif
459
460int bcm43xx_rx(struct bcm43xx_private *bcm,
461 struct sk_buff *skb,
462 struct bcm43xx_rxhdr *rxhdr)
463{
464 struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
465 struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
466 struct bcm43xx_plcp_hdr4 *plcp;
467 struct ieee80211_rx_stats stats;
468 struct ieee80211_hdr_4addr *wlhdr;
469 u16 frame_ctl;
470 int is_packet_for_us = 0;
471 int err = -EINVAL;
472 const u16 rxflags1 = le16_to_cpu(rxhdr->flags1);
473 const u16 rxflags2 = le16_to_cpu(rxhdr->flags2);
474 const u16 rxflags3 = le16_to_cpu(rxhdr->flags3);
475 const int is_ofdm = !!(rxflags1 & BCM43xx_RXHDR_FLAGS1_OFDM);
476
477 if (rxflags2 & BCM43xx_RXHDR_FLAGS2_TYPE2FRAME) {
478 plcp = (struct bcm43xx_plcp_hdr4 *)(skb->data + 2);
479 /* Skip two unknown bytes and the PLCP header. */
480 skb_pull(skb, 2 + sizeof(struct bcm43xx_plcp_hdr6));
481 } else {
482 plcp = (struct bcm43xx_plcp_hdr4 *)(skb->data);
483 /* Skip the PLCP header. */
484 skb_pull(skb, sizeof(struct bcm43xx_plcp_hdr6));
485 }
486 /* The SKB contains the PAYLOAD (wireless header + data)
487 * at this point. The FCS at the end is stripped.
488 */
489
490 memset(&stats, 0, sizeof(stats));
491 stats.mac_time = le16_to_cpu(rxhdr->mactime);
492 stats.rssi = bcm43xx_rssi_postprocess(bcm, rxhdr->rssi, is_ofdm,
493 !!(rxflags1 & BCM43xx_RXHDR_FLAGS1_2053RSSIADJ),
494 !!(rxflags3 & BCM43xx_RXHDR_FLAGS3_2050RSSIADJ));
495 stats.signal = rxhdr->signal_quality; //FIXME
496//TODO stats.noise =
497 if (is_ofdm)
498 stats.rate = bcm43xx_plcp_get_bitrate_ofdm(plcp);
499 else
500 stats.rate = bcm43xx_plcp_get_bitrate_cck(plcp);
501//printk("RX ofdm %d, rate == %u\n", is_ofdm, stats.rate);
502 stats.received_channel = radio->channel;
503//TODO stats.control =
504 stats.mask = IEEE80211_STATMASK_SIGNAL |
505//TODO IEEE80211_STATMASK_NOISE |
506 IEEE80211_STATMASK_RATE |
507 IEEE80211_STATMASK_RSSI;
508 if (phy->type == BCM43xx_PHYTYPE_A)
509 stats.freq = IEEE80211_52GHZ_BAND;
510 else
511 stats.freq = IEEE80211_24GHZ_BAND;
512 stats.len = skb->len;
513
514 bcm->stats.last_rx = jiffies;
515 if (bcm->ieee->iw_mode == IW_MODE_MONITOR) {
516 err = ieee80211_rx(bcm->ieee, skb, &stats);
517 return (err == 0) ? -EINVAL : 0;
518 }
519
520 wlhdr = (struct ieee80211_hdr_4addr *)(skb->data);
521
522 switch (bcm->ieee->iw_mode) {
523 case IW_MODE_ADHOC:
524 if (memcmp(wlhdr->addr1, bcm->net_dev->dev_addr, ETH_ALEN) == 0 ||
525 memcmp(wlhdr->addr3, bcm->ieee->bssid, ETH_ALEN) == 0 ||
526 is_broadcast_ether_addr(wlhdr->addr1) ||
527 is_multicast_ether_addr(wlhdr->addr1) ||
528 bcm->net_dev->flags & IFF_PROMISC)
529 is_packet_for_us = 1;
530 break;
531 case IW_MODE_INFRA:
532 default:
533 /* When receiving multicast or broadcast packets, filter out
534 the packets we send ourself; we shouldn't see those */
535 if (memcmp(wlhdr->addr3, bcm->ieee->bssid, ETH_ALEN) == 0 ||
536 memcmp(wlhdr->addr1, bcm->net_dev->dev_addr, ETH_ALEN) == 0 ||
537 (memcmp(wlhdr->addr3, bcm->net_dev->dev_addr, ETH_ALEN) &&
538 (is_broadcast_ether_addr(wlhdr->addr1) ||
539 is_multicast_ether_addr(wlhdr->addr1) ||
540 bcm->net_dev->flags & IFF_PROMISC)))
541 is_packet_for_us = 1;
542 break;
543 }
544
545 frame_ctl = le16_to_cpu(wlhdr->frame_ctl);
546 if ((frame_ctl & IEEE80211_FCTL_PROTECTED) && !bcm->ieee->host_decrypt) {
547 frame_ctl &= ~IEEE80211_FCTL_PROTECTED;
548 wlhdr->frame_ctl = cpu_to_le16(frame_ctl);
549 /* trim IV and ICV */
550 /* FIXME: this must be done only for WEP encrypted packets */
551 if (skb->len < 32) {
552 dprintkl(KERN_ERR PFX "RX packet dropped (PROTECTED flag "
553 "set and length < 32)\n");
554 return -EINVAL;
555 } else {
556 memmove(skb->data + 4, skb->data, 24);
557 skb_pull(skb, 4);
558 skb_trim(skb, skb->len - 4);
559 stats.len -= 8;
560 }
561 wlhdr = (struct ieee80211_hdr_4addr *)(skb->data);
562 }
563
564 switch (WLAN_FC_GET_TYPE(frame_ctl)) {
565 case IEEE80211_FTYPE_MGMT:
566 ieee80211_rx_mgt(bcm->ieee, wlhdr, &stats);
567 break;
568 case IEEE80211_FTYPE_DATA:
569 if (is_packet_for_us) {
570 err = ieee80211_rx(bcm->ieee, skb, &stats);
571 err = (err == 0) ? -EINVAL : 0;
572 }
573 break;
574 case IEEE80211_FTYPE_CTL:
575 break;
576 default:
577 assert(0);
578 return -EINVAL;
579 }
580
581 return err;
582}
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