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First Support on Ginger and OMAP TI
[linux-ginger.git] / drivers / staging / wlan-ng / p80211conv.c
blob5952c671073fc9d77bd9a2da2c1b4666e5254811
1 /* src/p80211/p80211conv.c
2 *
3 * Ether/802.11 conversions and packet buffer routines
4 *
5 * Copyright (C) 1999 AbsoluteValue Systems, Inc. All Rights Reserved.
6 * --------------------------------------------------------------------
7 *
8 * linux-wlan
9 *
10 * The contents of this file are subject to the Mozilla Public
11 * License Version 1.1 (the "License"); you may not use this file
12 * except in compliance with the License. You may obtain a copy of
13 * the License at http://www.mozilla.org/MPL/
14 *
15 * Software distributed under the License is distributed on an "AS
16 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
17 * implied. See the License for the specific language governing
18 * rights and limitations under the License.
19 *
20 * Alternatively, the contents of this file may be used under the
21 * terms of the GNU Public License version 2 (the "GPL"), in which
22 * case the provisions of the GPL are applicable instead of the
23 * above. If you wish to allow the use of your version of this file
24 * only under the terms of the GPL and not to allow others to use
25 * your version of this file under the MPL, indicate your decision
26 * by deleting the provisions above and replace them with the notice
27 * and other provisions required by the GPL. If you do not delete
28 * the provisions above, a recipient may use your version of this
29 * file under either the MPL or the GPL.
30 *
31 * --------------------------------------------------------------------
32 *
33 * Inquiries regarding the linux-wlan Open Source project can be
34 * made directly to:
35 *
36 * AbsoluteValue Systems Inc.
37 * info@linux-wlan.com
38 * http://www.linux-wlan.com
39 *
40 * --------------------------------------------------------------------
41 *
42 * Portions of the development of this software were funded by
43 * Intersil Corporation as part of PRISM(R) chipset product development.
44 *
45 * --------------------------------------------------------------------
46 *
47 * This file defines the functions that perform Ethernet to/from
48 * 802.11 frame conversions.
49 *
50 * --------------------------------------------------------------------
51 *
52 *================================================================ */
53
54 #include <linux/module.h>
55 #include <linux/kernel.h>
56 #include <linux/sched.h>
57 #include <linux/types.h>
58 #include <linux/skbuff.h>
59 #include <linux/slab.h>
60 #include <linux/wireless.h>
61 #include <linux/netdevice.h>
62 #include <linux/etherdevice.h>
63 #include <linux/if_ether.h>
64 #include <linux/byteorder/generic.h>
65
66 #include <asm/byteorder.h>
67
68 #include "p80211types.h"
69 #include "p80211hdr.h"
70 #include "p80211conv.h"
71 #include "p80211mgmt.h"
72 #include "p80211msg.h"
73 #include "p80211netdev.h"
74 #include "p80211ioctl.h"
75 #include "p80211req.h"
76
77 static u8 oui_rfc1042[] = { 0x00, 0x00, 0x00 };
78 static u8 oui_8021h[] = { 0x00, 0x00, 0xf8 };
79
80 /*----------------------------------------------------------------
81 * p80211pb_ether_to_80211
82 *
83 * Uses the contents of the ether frame and the etherconv setting
84 * to build the elements of the 802.11 frame.
85 *
86 * We don't actually set
87 * up the frame header here. That's the MAC's job. We're only handling
88 * conversion of DIXII or 802.3+LLC frames to something that works
89 * with 802.11.
90 *
91 * Note -- 802.11 header is NOT part of the skb. Likewise, the 802.11
92 * FCS is also not present and will need to be added elsewhere.
93 *
94 * Arguments:
95 * ethconv Conversion type to perform
96 * skb skbuff containing the ether frame
97 * p80211_hdr 802.11 header
98 *
99 * Returns:
100 * 0 on success, non-zero otherwise
101 *
102 * Call context:
103 * May be called in interrupt or non-interrupt context
104 ----------------------------------------------------------------*/
105 int skb_ether_to_p80211(wlandevice_t *wlandev, u32 ethconv,
106 struct sk_buff *skb, p80211_hdr_t *p80211_hdr,
107 p80211_metawep_t *p80211_wep)
108 {
109
110 u16 fc;
111 u16 proto;
112 wlan_ethhdr_t e_hdr;
113 wlan_llc_t *e_llc;
114 wlan_snap_t *e_snap;
115 int foo;
116
117 memcpy(&e_hdr, skb->data, sizeof(e_hdr));
118
119 if (skb->len <= 0) {
120 pr_debug("zero-length skb!\n");
121 return 1;
122 }
123
124 if (ethconv == WLAN_ETHCONV_ENCAP) { /* simplest case */
125 pr_debug("ENCAP len: %d\n", skb->len);
126 /* here, we don't care what kind of ether frm. Just stick it */
127 /* in the 80211 payload */
128 /* which is to say, leave the skb alone. */
129 } else {
130 /* step 1: classify ether frame, DIX or 802.3? */
131 proto = ntohs(e_hdr.type);
132 if (proto <= 1500) {
133 pr_debug("802.3 len: %d\n", skb->len);
134 /* codes <= 1500 reserved for 802.3 lengths */
135 /* it's 802.3, pass ether payload unchanged, */
136
137 /* trim off ethernet header */
138 skb_pull(skb, WLAN_ETHHDR_LEN);
139
140 /* leave off any PAD octets. */
141 skb_trim(skb, proto);
142 } else {
143 pr_debug("DIXII len: %d\n", skb->len);
144 /* it's DIXII, time for some conversion */
145
146 /* trim off ethernet header */
147 skb_pull(skb, WLAN_ETHHDR_LEN);
148
149 /* tack on SNAP */
150 e_snap =
151 (wlan_snap_t *) skb_push(skb, sizeof(wlan_snap_t));
152 e_snap->type = htons(proto);
153 if (ethconv == WLAN_ETHCONV_8021h
154 && p80211_stt_findproto(proto)) {
155 memcpy(e_snap->oui, oui_8021h,
156 WLAN_IEEE_OUI_LEN);
157 } else {
158 memcpy(e_snap->oui, oui_rfc1042,
159 WLAN_IEEE_OUI_LEN);
160 }
161
162 /* tack on llc */
163 e_llc =
164 (wlan_llc_t *) skb_push(skb, sizeof(wlan_llc_t));
165 e_llc->dsap = 0xAA; /* SNAP, see IEEE 802 */
166 e_llc->ssap = 0xAA;
167 e_llc->ctl = 0x03;
168
169 }
170 }
171
172 /* Set up the 802.11 header */
173 /* It's a data frame */
174 fc = cpu_to_le16(WLAN_SET_FC_FTYPE(WLAN_FTYPE_DATA) |
175 WLAN_SET_FC_FSTYPE(WLAN_FSTYPE_DATAONLY));
176
177 switch (wlandev->macmode) {
178 case WLAN_MACMODE_IBSS_STA:
179 memcpy(p80211_hdr->a3.a1, &e_hdr.daddr, ETH_ALEN);
180 memcpy(p80211_hdr->a3.a2, wlandev->netdev->dev_addr, ETH_ALEN);
181 memcpy(p80211_hdr->a3.a3, wlandev->bssid, ETH_ALEN);
182 break;
183 case WLAN_MACMODE_ESS_STA:
184 fc |= cpu_to_le16(WLAN_SET_FC_TODS(1));
185 memcpy(p80211_hdr->a3.a1, wlandev->bssid, ETH_ALEN);
186 memcpy(p80211_hdr->a3.a2, wlandev->netdev->dev_addr, ETH_ALEN);
187 memcpy(p80211_hdr->a3.a3, &e_hdr.daddr, ETH_ALEN);
188 break;
189 case WLAN_MACMODE_ESS_AP:
190 fc |= cpu_to_le16(WLAN_SET_FC_FROMDS(1));
191 memcpy(p80211_hdr->a3.a1, &e_hdr.daddr, ETH_ALEN);
192 memcpy(p80211_hdr->a3.a2, wlandev->bssid, ETH_ALEN);
193 memcpy(p80211_hdr->a3.a3, &e_hdr.saddr, ETH_ALEN);
194 break;
195 default:
196 printk(KERN_ERR
197 "Error: Converting eth to wlan in unknown mode.\n");
198 return 1;
199 break;
200 }
201
202 p80211_wep->data = NULL;
203
204 if ((wlandev->hostwep & HOSTWEP_PRIVACYINVOKED)
205 && (wlandev->hostwep & HOSTWEP_ENCRYPT)) {
206 /* XXXX need to pick keynum other than default? */
207
208 p80211_wep->data = kmalloc(skb->len, GFP_ATOMIC);
209
210 if ((foo = wep_encrypt(wlandev, skb->data, p80211_wep->data,
211 skb->len,
212 (wlandev->hostwep &
213 HOSTWEP_DEFAULTKEY_MASK),
214 p80211_wep->iv, p80211_wep->icv))) {
215 printk(KERN_WARNING
216 "Host en-WEP failed, dropping frame (%d).\n",
217 foo);
218 return 2;
219 }
220 fc |= cpu_to_le16(WLAN_SET_FC_ISWEP(1));
221 }
222
223 /* skb->nh.raw = skb->data; */
224
225 p80211_hdr->a3.fc = fc;
226 p80211_hdr->a3.dur = 0;
227 p80211_hdr->a3.seq = 0;
228
229 return 0;
230 }
231
232 /* jkriegl: from orinoco, modified */
233 static void orinoco_spy_gather(wlandevice_t *wlandev, char *mac,
234 p80211_rxmeta_t *rxmeta)
235 {
236 int i;
237
238 /* Gather wireless spy statistics: for each packet, compare the
239 * source address with out list, and if match, get the stats... */
240
241 for (i = 0; i < wlandev->spy_number; i++) {
242
243 if (!memcmp(wlandev->spy_address[i], mac, ETH_ALEN)) {
244 memcpy(wlandev->spy_address[i], mac, ETH_ALEN);
245 wlandev->spy_stat[i].level = rxmeta->signal;
246 wlandev->spy_stat[i].noise = rxmeta->noise;
247 wlandev->spy_stat[i].qual =
248 (rxmeta->signal >
249 rxmeta->noise) ? (rxmeta->signal -
250 rxmeta->noise) : 0;
251 wlandev->spy_stat[i].updated = 0x7;
252 }
253 }
254 }
255
256 /*----------------------------------------------------------------
257 * p80211pb_80211_to_ether
258 *
259 * Uses the contents of a received 802.11 frame and the etherconv
260 * setting to build an ether frame.
261 *
262 * This function extracts the src and dest address from the 802.11
263 * frame to use in the construction of the eth frame.
264 *
265 * Arguments:
266 * ethconv Conversion type to perform
267 * skb Packet buffer containing the 802.11 frame
268 *
269 * Returns:
270 * 0 on success, non-zero otherwise
271 *
272 * Call context:
273 * May be called in interrupt or non-interrupt context
274 ----------------------------------------------------------------*/
275 int skb_p80211_to_ether(wlandevice_t *wlandev, u32 ethconv,
276 struct sk_buff *skb)
277 {
278 netdevice_t *netdev = wlandev->netdev;
279 u16 fc;
280 unsigned int payload_length;
281 unsigned int payload_offset;
282 u8 daddr[WLAN_ETHADDR_LEN];
283 u8 saddr[WLAN_ETHADDR_LEN];
284 p80211_hdr_t *w_hdr;
285 wlan_ethhdr_t *e_hdr;
286 wlan_llc_t *e_llc;
287 wlan_snap_t *e_snap;
288
289 int foo;
290
291 payload_length = skb->len - WLAN_HDR_A3_LEN - WLAN_CRC_LEN;
292 payload_offset = WLAN_HDR_A3_LEN;
293
294 w_hdr = (p80211_hdr_t *) skb->data;
295
296 /* setup some vars for convenience */
297 fc = le16_to_cpu(w_hdr->a3.fc);
298 if ((WLAN_GET_FC_TODS(fc) == 0) && (WLAN_GET_FC_FROMDS(fc) == 0)) {
299 memcpy(daddr, w_hdr->a3.a1, WLAN_ETHADDR_LEN);
300 memcpy(saddr, w_hdr->a3.a2, WLAN_ETHADDR_LEN);
301 } else if ((WLAN_GET_FC_TODS(fc) == 0) && (WLAN_GET_FC_FROMDS(fc) == 1)) {
302 memcpy(daddr, w_hdr->a3.a1, WLAN_ETHADDR_LEN);
303 memcpy(saddr, w_hdr->a3.a3, WLAN_ETHADDR_LEN);
304 } else if ((WLAN_GET_FC_TODS(fc) == 1) && (WLAN_GET_FC_FROMDS(fc) == 0)) {
305 memcpy(daddr, w_hdr->a3.a3, WLAN_ETHADDR_LEN);
306 memcpy(saddr, w_hdr->a3.a2, WLAN_ETHADDR_LEN);
307 } else {
308 payload_offset = WLAN_HDR_A4_LEN;
309 if (payload_length < WLAN_HDR_A4_LEN - WLAN_HDR_A3_LEN) {
310 printk(KERN_ERR "A4 frame too short!\n");
311 return 1;
312 }
313 payload_length -= (WLAN_HDR_A4_LEN - WLAN_HDR_A3_LEN);
314 memcpy(daddr, w_hdr->a4.a3, WLAN_ETHADDR_LEN);
315 memcpy(saddr, w_hdr->a4.a4, WLAN_ETHADDR_LEN);
316 }
317
318 /* perform de-wep if necessary.. */
319 if ((wlandev->hostwep & HOSTWEP_PRIVACYINVOKED) && WLAN_GET_FC_ISWEP(fc)
320 && (wlandev->hostwep & HOSTWEP_DECRYPT)) {
321 if (payload_length <= 8) {
322 printk(KERN_ERR "WEP frame too short (%u).\n",
323 skb->len);
324 return 1;
325 }
326 if ((foo = wep_decrypt(wlandev, skb->data + payload_offset + 4,
327 payload_length - 8, -1,
328 skb->data + payload_offset,
329 skb->data + payload_offset +
330 payload_length - 4))) {
331 /* de-wep failed, drop skb. */
332 pr_debug("Host de-WEP failed, dropping frame (%d).\n",
333 foo);
334 wlandev->rx.decrypt_err++;
335 return 2;
336 }
337
338 /* subtract the IV+ICV length off the payload */
339 payload_length -= 8;
340 /* chop off the IV */
341 skb_pull(skb, 4);
342 /* chop off the ICV. */
343 skb_trim(skb, skb->len - 4);
344
345 wlandev->rx.decrypt++;
346 }
347
348 e_hdr = (wlan_ethhdr_t *) (skb->data + payload_offset);
349
350 e_llc = (wlan_llc_t *) (skb->data + payload_offset);
351 e_snap =
352 (wlan_snap_t *) (skb->data + payload_offset + sizeof(wlan_llc_t));
353
354 /* Test for the various encodings */
355 if ((payload_length >= sizeof(wlan_ethhdr_t)) &&
356 (e_llc->dsap != 0xaa || e_llc->ssap != 0xaa) &&
357 ((memcmp(daddr, e_hdr->daddr, WLAN_ETHADDR_LEN) == 0) ||
358 (memcmp(saddr, e_hdr->saddr, WLAN_ETHADDR_LEN) == 0))) {
359 pr_debug("802.3 ENCAP len: %d\n", payload_length);
360 /* 802.3 Encapsulated */
361 /* Test for an overlength frame */
362 if (payload_length > (netdev->mtu + WLAN_ETHHDR_LEN)) {
363 /* A bogus length ethfrm has been encap'd. */
364 /* Is someone trying an oflow attack? */
365 printk(KERN_ERR "ENCAP frame too large (%d > %d)\n",
366 payload_length, netdev->mtu + WLAN_ETHHDR_LEN);
367 return 1;
368 }
369
370 /* Chop off the 802.11 header. it's already sane. */
371 skb_pull(skb, payload_offset);
372 /* chop off the 802.11 CRC */
373 skb_trim(skb, skb->len - WLAN_CRC_LEN);
374
375 } else if ((payload_length >= sizeof(wlan_llc_t) + sizeof(wlan_snap_t))
376 && (e_llc->dsap == 0xaa) && (e_llc->ssap == 0xaa)
377 && (e_llc->ctl == 0x03)
378 &&
379 (((memcmp(e_snap->oui, oui_rfc1042, WLAN_IEEE_OUI_LEN) == 0)
380 && (ethconv == WLAN_ETHCONV_8021h)
381 && (p80211_stt_findproto(le16_to_cpu(e_snap->type))))
382 || (memcmp(e_snap->oui, oui_rfc1042, WLAN_IEEE_OUI_LEN) !=
383 0))) {
384 pr_debug("SNAP+RFC1042 len: %d\n", payload_length);
385 /* it's a SNAP + RFC1042 frame && protocol is in STT */
386 /* build 802.3 + RFC1042 */
387
388 /* Test for an overlength frame */
389 if (payload_length > netdev->mtu) {
390 /* A bogus length ethfrm has been sent. */
391 /* Is someone trying an oflow attack? */
392 printk(KERN_ERR "SNAP frame too large (%d > %d)\n",
393 payload_length, netdev->mtu);
394 return 1;
395 }
396
397 /* chop 802.11 header from skb. */
398 skb_pull(skb, payload_offset);
399
400 /* create 802.3 header at beginning of skb. */
401 e_hdr = (wlan_ethhdr_t *) skb_push(skb, WLAN_ETHHDR_LEN);
402 memcpy(e_hdr->daddr, daddr, WLAN_ETHADDR_LEN);
403 memcpy(e_hdr->saddr, saddr, WLAN_ETHADDR_LEN);
404 e_hdr->type = htons(payload_length);
405
406 /* chop off the 802.11 CRC */
407 skb_trim(skb, skb->len - WLAN_CRC_LEN);
408
409 } else if ((payload_length >= sizeof(wlan_llc_t) + sizeof(wlan_snap_t))
410 && (e_llc->dsap == 0xaa) && (e_llc->ssap == 0xaa)
411 && (e_llc->ctl == 0x03)) {
412 pr_debug("802.1h/RFC1042 len: %d\n", payload_length);
413 /* it's an 802.1h frame || (an RFC1042 && protocol is not in STT) */
414 /* build a DIXII + RFC894 */
415
416 /* Test for an overlength frame */
417 if ((payload_length - sizeof(wlan_llc_t) - sizeof(wlan_snap_t))
418 > netdev->mtu) {
419 /* A bogus length ethfrm has been sent. */
420 /* Is someone trying an oflow attack? */
421 printk(KERN_ERR "DIXII frame too large (%ld > %d)\n",
422 (long int)(payload_length - sizeof(wlan_llc_t) -
423 sizeof(wlan_snap_t)), netdev->mtu);
424 return 1;
425 }
426
427 /* chop 802.11 header from skb. */
428 skb_pull(skb, payload_offset);
429
430 /* chop llc header from skb. */
431 skb_pull(skb, sizeof(wlan_llc_t));
432
433 /* chop snap header from skb. */
434 skb_pull(skb, sizeof(wlan_snap_t));
435
436 /* create 802.3 header at beginning of skb. */
437 e_hdr = (wlan_ethhdr_t *) skb_push(skb, WLAN_ETHHDR_LEN);
438 e_hdr->type = e_snap->type;
439 memcpy(e_hdr->daddr, daddr, WLAN_ETHADDR_LEN);
440 memcpy(e_hdr->saddr, saddr, WLAN_ETHADDR_LEN);
441
442 /* chop off the 802.11 CRC */
443 skb_trim(skb, skb->len - WLAN_CRC_LEN);
444 } else {
445 pr_debug("NON-ENCAP len: %d\n", payload_length);
446 /* any NON-ENCAP */
447 /* it's a generic 80211+LLC or IPX 'Raw 802.3' */
448 /* build an 802.3 frame */
449 /* allocate space and setup hostbuf */
450
451 /* Test for an overlength frame */
452 if (payload_length > netdev->mtu) {
453 /* A bogus length ethfrm has been sent. */
454 /* Is someone trying an oflow attack? */
455 printk(KERN_ERR "OTHER frame too large (%d > %d)\n",
456 payload_length, netdev->mtu);
457 return 1;
458 }
459
460 /* Chop off the 802.11 header. */
461 skb_pull(skb, payload_offset);
462
463 /* create 802.3 header at beginning of skb. */
464 e_hdr = (wlan_ethhdr_t *) skb_push(skb, WLAN_ETHHDR_LEN);
465 memcpy(e_hdr->daddr, daddr, WLAN_ETHADDR_LEN);
466 memcpy(e_hdr->saddr, saddr, WLAN_ETHADDR_LEN);
467 e_hdr->type = htons(payload_length);
468
469 /* chop off the 802.11 CRC */
470 skb_trim(skb, skb->len - WLAN_CRC_LEN);
471
472 }
473
474 /*
475 * Note that eth_type_trans() expects an skb w/ skb->data pointing
476 * at the MAC header, it then sets the following skb members:
477 * skb->mac_header,
478 * skb->data, and
479 * skb->pkt_type.
480 * It then _returns_ the value that _we're_ supposed to stuff in
481 * skb->protocol. This is nuts.
482 */
483 skb->protocol = eth_type_trans(skb, netdev);
484
485 /* jkriegl: process signal and noise as set in hfa384x_int_rx() */
486 /* jkriegl: only process signal/noise if requested by iwspy */
487 if (wlandev->spy_number)
488 orinoco_spy_gather(wlandev, eth_hdr(skb)->h_source,
489 P80211SKB_RXMETA(skb));
490
491 /* Free the metadata */
492 p80211skb_rxmeta_detach(skb);
493
494 return 0;
495 }
496
497 /*----------------------------------------------------------------
498 * p80211_stt_findproto
499 *
500 * Searches the 802.1h Selective Translation Table for a given
501 * protocol.
502 *
503 * Arguments:
504 * proto protocl number (in host order) to search for.
505 *
506 * Returns:
507 * 1 - if the table is empty or a match is found.
508 * 0 - if the table is non-empty and a match is not found.
509 *
510 * Call context:
511 * May be called in interrupt or non-interrupt context
512 ----------------------------------------------------------------*/
513 int p80211_stt_findproto(u16 proto)
514 {
515 /* Always return found for now. This is the behavior used by the */
516 /* Zoom Win95 driver when 802.1h mode is selected */
517 /* TODO: If necessary, add an actual search we'll probably
518 need this to match the CMAC's way of doing things.
519 Need to do some testing to confirm.
520 */
521
522 if (proto == 0x80f3) /* APPLETALK */
523 return 1;
524
525 return 0;
526 }
527
528 /*----------------------------------------------------------------
529 * p80211skb_rxmeta_detach
530 *
531 * Disconnects the frmmeta and rxmeta from an skb.
532 *
533 * Arguments:
534 * wlandev The wlandev this skb belongs to.
535 * skb The skb we're attaching to.
536 *
537 * Returns:
538 * 0 on success, non-zero otherwise
539 *
540 * Call context:
541 * May be called in interrupt or non-interrupt context
542 ----------------------------------------------------------------*/
543 void p80211skb_rxmeta_detach(struct sk_buff *skb)
544 {
545 p80211_rxmeta_t *rxmeta;
546 p80211_frmmeta_t *frmmeta;
547
548 /* Sanity checks */
549 if (skb == NULL) { /* bad skb */
550 pr_debug("Called w/ null skb.\n");
551 goto exit;
552 }
553 frmmeta = P80211SKB_FRMMETA(skb);
554 if (frmmeta == NULL) { /* no magic */
555 pr_debug("Called w/ bad frmmeta magic.\n");
556 goto exit;
557 }
558 rxmeta = frmmeta->rx;
559 if (rxmeta == NULL) { /* bad meta ptr */
560 pr_debug("Called w/ bad rxmeta ptr.\n");
561 goto exit;
562 }
563
564 /* Free rxmeta */
565 kfree(rxmeta);
566
567 /* Clear skb->cb */
568 memset(skb->cb, 0, sizeof(skb->cb));
569 exit:
570 return;
571 }
572
573 /*----------------------------------------------------------------
574 * p80211skb_rxmeta_attach
575 *
576 * Allocates a p80211rxmeta structure, initializes it, and attaches
577 * it to an skb.
578 *
579 * Arguments:
580 * wlandev The wlandev this skb belongs to.
581 * skb The skb we're attaching to.
582 *
583 * Returns:
584 * 0 on success, non-zero otherwise
585 *
586 * Call context:
587 * May be called in interrupt or non-interrupt context
588 ----------------------------------------------------------------*/
589 int p80211skb_rxmeta_attach(struct wlandevice *wlandev, struct sk_buff *skb)
590 {
591 int result = 0;
592 p80211_rxmeta_t *rxmeta;
593 p80211_frmmeta_t *frmmeta;
594
595 /* If these already have metadata, we error out! */
596 if (P80211SKB_RXMETA(skb) != NULL) {
597 printk(KERN_ERR "%s: RXmeta already attached!\n",
598 wlandev->name);
599 result = 0;
600 goto exit;
601 }
602
603 /* Allocate the rxmeta */
604 rxmeta = kmalloc(sizeof(p80211_rxmeta_t), GFP_ATOMIC);
605
606 if (rxmeta == NULL) {
607 printk(KERN_ERR "%s: Failed to allocate rxmeta.\n",
608 wlandev->name);
609 result = 1;
610 goto exit;
611 }
612
613 /* Initialize the rxmeta */
614 memset(rxmeta, 0, sizeof(p80211_rxmeta_t));
615 rxmeta->wlandev = wlandev;
616 rxmeta->hosttime = jiffies;
617
618 /* Overlay a frmmeta_t onto skb->cb */
619 memset(skb->cb, 0, sizeof(p80211_frmmeta_t));
620 frmmeta = (p80211_frmmeta_t *) (skb->cb);
621 frmmeta->magic = P80211_FRMMETA_MAGIC;
622 frmmeta->rx = rxmeta;
623 exit:
624 return result;
625 }
626
627 /*----------------------------------------------------------------
628 * p80211skb_free
629 *
630 * Frees an entire p80211skb by checking and freeing the meta struct
631 * and then freeing the skb.
632 *
633 * Arguments:
634 * wlandev The wlandev this skb belongs to.
635 * skb The skb we're attaching to.
636 *
637 * Returns:
638 * 0 on success, non-zero otherwise
639 *
640 * Call context:
641 * May be called in interrupt or non-interrupt context
642 ----------------------------------------------------------------*/
643 void p80211skb_free(struct wlandevice *wlandev, struct sk_buff *skb)
644 {
645 p80211_frmmeta_t *meta;
646
647 meta = P80211SKB_FRMMETA(skb);
648 if (meta && meta->rx)
649 p80211skb_rxmeta_detach(skb);
650 else
651 printk(KERN_ERR "Freeing an skb (%p) w/ no frmmeta.\n", skb);
652 dev_kfree_skb(skb);
653 return;
654 }
Linux for Ginger Game Console