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Linux 3.6-rc6
[linux/fpc-iii.git] / net / mac802154 / wpan.c
blobf30f6d4beea178ed46750131e5840decd8c5238a
1 /*
2 * Copyright 2007-2012 Siemens AG
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 *
17 * Written by:
18 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
19 * Sergey Lapin <slapin@ossfans.org>
20 * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
21 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
22 */
23
24 #include <linux/netdevice.h>
25 #include <linux/module.h>
26 #include <linux/if_arp.h>
27
28 #include <net/rtnetlink.h>
29 #include <linux/nl802154.h>
30 #include <net/af_ieee802154.h>
31 #include <net/mac802154.h>
32 #include <net/ieee802154_netdev.h>
33 #include <net/ieee802154.h>
34 #include <net/wpan-phy.h>
35
36 #include "mac802154.h"
37
38 static inline int mac802154_fetch_skb_u8(struct sk_buff *skb, u8 *val)
39 {
40 if (unlikely(!pskb_may_pull(skb, 1)))
41 return -EINVAL;
42
43 *val = skb->data[0];
44 skb_pull(skb, 1);
45
46 return 0;
47 }
48
49 static inline int mac802154_fetch_skb_u16(struct sk_buff *skb, u16 *val)
50 {
51 if (unlikely(!pskb_may_pull(skb, 2)))
52 return -EINVAL;
53
54 *val = skb->data[0] | (skb->data[1] << 8);
55 skb_pull(skb, 2);
56
57 return 0;
58 }
59
60 static inline void mac802154_haddr_copy_swap(u8 *dest, const u8 *src)
61 {
62 int i;
63 for (i = 0; i < IEEE802154_ADDR_LEN; i++)
64 dest[IEEE802154_ADDR_LEN - i - 1] = src[i];
65 }
66
67 static int
68 mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
69 {
70 struct mac802154_sub_if_data *priv = netdev_priv(dev);
71 struct sockaddr_ieee802154 *sa =
72 (struct sockaddr_ieee802154 *)&ifr->ifr_addr;
73 int err = -ENOIOCTLCMD;
74
75 spin_lock_bh(&priv->mib_lock);
76
77 switch (cmd) {
78 case SIOCGIFADDR:
79 if (priv->pan_id == IEEE802154_PANID_BROADCAST ||
80 priv->short_addr == IEEE802154_ADDR_BROADCAST) {
81 err = -EADDRNOTAVAIL;
82 break;
83 }
84
85 sa->family = AF_IEEE802154;
86 sa->addr.addr_type = IEEE802154_ADDR_SHORT;
87 sa->addr.pan_id = priv->pan_id;
88 sa->addr.short_addr = priv->short_addr;
89
90 err = 0;
91 break;
92 case SIOCSIFADDR:
93 dev_warn(&dev->dev,
94 "Using DEBUGing ioctl SIOCSIFADDR isn't recommened!\n");
95 if (sa->family != AF_IEEE802154 ||
96 sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
97 sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
98 sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
99 sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
100 err = -EINVAL;
101 break;
102 }
103
104 priv->pan_id = sa->addr.pan_id;
105 priv->short_addr = sa->addr.short_addr;
106
107 err = 0;
108 break;
109 }
110
111 spin_unlock_bh(&priv->mib_lock);
112 return err;
113 }
114
115 static int mac802154_wpan_mac_addr(struct net_device *dev, void *p)
116 {
117 struct sockaddr *addr = p;
118
119 if (netif_running(dev))
120 return -EBUSY;
121
122 /* FIXME: validate addr */
123 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
124 mac802154_dev_set_ieee_addr(dev);
125 return 0;
126 }
127
128 static int mac802154_header_create(struct sk_buff *skb,
129 struct net_device *dev,
130 unsigned short type,
131 const void *_daddr,
132 const void *_saddr,
133 unsigned len)
134 {
135 const struct ieee802154_addr *saddr = _saddr;
136 const struct ieee802154_addr *daddr = _daddr;
137 struct ieee802154_addr dev_addr;
138 struct mac802154_sub_if_data *priv = netdev_priv(dev);
139 int pos = 2;
140 u8 *head;
141 u16 fc;
142
143 if (!daddr)
144 return -EINVAL;
145
146 head = kzalloc(MAC802154_FRAME_HARD_HEADER_LEN, GFP_KERNEL);
147 if (head == NULL)
148 return -ENOMEM;
149
150 head[pos++] = mac_cb(skb)->seq; /* DSN/BSN */
151 fc = mac_cb_type(skb);
152
153 if (!saddr) {
154 spin_lock_bh(&priv->mib_lock);
155
156 if (priv->short_addr == IEEE802154_ADDR_BROADCAST ||
157 priv->short_addr == IEEE802154_ADDR_UNDEF ||
158 priv->pan_id == IEEE802154_PANID_BROADCAST) {
159 dev_addr.addr_type = IEEE802154_ADDR_LONG;
160 memcpy(dev_addr.hwaddr, dev->dev_addr,
161 IEEE802154_ADDR_LEN);
162 } else {
163 dev_addr.addr_type = IEEE802154_ADDR_SHORT;
164 dev_addr.short_addr = priv->short_addr;
165 }
166
167 dev_addr.pan_id = priv->pan_id;
168 saddr = &dev_addr;
169
170 spin_unlock_bh(&priv->mib_lock);
171 }
172
173 if (daddr->addr_type != IEEE802154_ADDR_NONE) {
174 fc |= (daddr->addr_type << IEEE802154_FC_DAMODE_SHIFT);
175
176 head[pos++] = daddr->pan_id & 0xff;
177 head[pos++] = daddr->pan_id >> 8;
178
179 if (daddr->addr_type == IEEE802154_ADDR_SHORT) {
180 head[pos++] = daddr->short_addr & 0xff;
181 head[pos++] = daddr->short_addr >> 8;
182 } else {
183 mac802154_haddr_copy_swap(head + pos, daddr->hwaddr);
184 pos += IEEE802154_ADDR_LEN;
185 }
186 }
187
188 if (saddr->addr_type != IEEE802154_ADDR_NONE) {
189 fc |= (saddr->addr_type << IEEE802154_FC_SAMODE_SHIFT);
190
191 if ((saddr->pan_id == daddr->pan_id) &&
192 (saddr->pan_id != IEEE802154_PANID_BROADCAST)) {
193 /* PANID compression/intra PAN */
194 fc |= IEEE802154_FC_INTRA_PAN;
195 } else {
196 head[pos++] = saddr->pan_id & 0xff;
197 head[pos++] = saddr->pan_id >> 8;
198 }
199
200 if (saddr->addr_type == IEEE802154_ADDR_SHORT) {
201 head[pos++] = saddr->short_addr & 0xff;
202 head[pos++] = saddr->short_addr >> 8;
203 } else {
204 mac802154_haddr_copy_swap(head + pos, saddr->hwaddr);
205 pos += IEEE802154_ADDR_LEN;
206 }
207 }
208
209 head[0] = fc;
210 head[1] = fc >> 8;
211
212 memcpy(skb_push(skb, pos), head, pos);
213 kfree(head);
214
215 return pos;
216 }
217
218 static int
219 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
220 {
221 const u8 *hdr = skb_mac_header(skb);
222 const u8 *tail = skb_tail_pointer(skb);
223 struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
224 u16 fc;
225 int da_type;
226
227 if (hdr + 3 > tail)
228 goto malformed;
229
230 fc = hdr[0] | (hdr[1] << 8);
231
232 hdr += 3;
233
234 da_type = IEEE802154_FC_DAMODE(fc);
235 addr->addr_type = IEEE802154_FC_SAMODE(fc);
236
237 switch (da_type) {
238 case IEEE802154_ADDR_NONE:
239 if (fc & IEEE802154_FC_INTRA_PAN)
240 goto malformed;
241 break;
242 case IEEE802154_ADDR_LONG:
243 if (fc & IEEE802154_FC_INTRA_PAN) {
244 if (hdr + 2 > tail)
245 goto malformed;
246 addr->pan_id = hdr[0] | (hdr[1] << 8);
247 hdr += 2;
248 }
249
250 if (hdr + IEEE802154_ADDR_LEN > tail)
251 goto malformed;
252
253 hdr += IEEE802154_ADDR_LEN;
254 break;
255 case IEEE802154_ADDR_SHORT:
256 if (fc & IEEE802154_FC_INTRA_PAN) {
257 if (hdr + 2 > tail)
258 goto malformed;
259 addr->pan_id = hdr[0] | (hdr[1] << 8);
260 hdr += 2;
261 }
262
263 if (hdr + 2 > tail)
264 goto malformed;
265
266 hdr += 2;
267 break;
268 default:
269 goto malformed;
270
271 }
272
273 switch (addr->addr_type) {
274 case IEEE802154_ADDR_NONE:
275 break;
276 case IEEE802154_ADDR_LONG:
277 if (!(fc & IEEE802154_FC_INTRA_PAN)) {
278 if (hdr + 2 > tail)
279 goto malformed;
280 addr->pan_id = hdr[0] | (hdr[1] << 8);
281 hdr += 2;
282 }
283
284 if (hdr + IEEE802154_ADDR_LEN > tail)
285 goto malformed;
286
287 mac802154_haddr_copy_swap(addr->hwaddr, hdr);
288 hdr += IEEE802154_ADDR_LEN;
289 break;
290 case IEEE802154_ADDR_SHORT:
291 if (!(fc & IEEE802154_FC_INTRA_PAN)) {
292 if (hdr + 2 > tail)
293 goto malformed;
294 addr->pan_id = hdr[0] | (hdr[1] << 8);
295 hdr += 2;
296 }
297
298 if (hdr + 2 > tail)
299 goto malformed;
300
301 addr->short_addr = hdr[0] | (hdr[1] << 8);
302 hdr += 2;
303 break;
304 default:
305 goto malformed;
306 }
307
308 return sizeof(struct ieee802154_addr);
309
310 malformed:
311 pr_debug("malformed packet\n");
312 return 0;
313 }
314
315 static netdev_tx_t
316 mac802154_wpan_xmit(struct sk_buff *skb, struct net_device *dev)
317 {
318 struct mac802154_sub_if_data *priv;
319 u8 chan, page;
320
321 priv = netdev_priv(dev);
322
323 spin_lock_bh(&priv->mib_lock);
324 chan = priv->chan;
325 page = priv->page;
326 spin_unlock_bh(&priv->mib_lock);
327
328 if (chan == MAC802154_CHAN_NONE ||
329 page >= WPAN_NUM_PAGES ||
330 chan >= WPAN_NUM_CHANNELS)
331 return NETDEV_TX_OK;
332
333 skb->skb_iif = dev->ifindex;
334 dev->stats.tx_packets++;
335 dev->stats.tx_bytes += skb->len;
336
337 return mac802154_tx(priv->hw, skb, page, chan);
338 }
339
340 static struct header_ops mac802154_header_ops = {
341 .create = mac802154_header_create,
342 .parse = mac802154_header_parse,
343 };
344
345 static const struct net_device_ops mac802154_wpan_ops = {
346 .ndo_open = mac802154_slave_open,
347 .ndo_stop = mac802154_slave_close,
348 .ndo_start_xmit = mac802154_wpan_xmit,
349 .ndo_do_ioctl = mac802154_wpan_ioctl,
350 .ndo_set_mac_address = mac802154_wpan_mac_addr,
351 };
352
353 void mac802154_wpan_setup(struct net_device *dev)
354 {
355 struct mac802154_sub_if_data *priv;
356
357 dev->addr_len = IEEE802154_ADDR_LEN;
358 memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
359
360 dev->hard_header_len = MAC802154_FRAME_HARD_HEADER_LEN;
361 dev->header_ops = &mac802154_header_ops;
362 dev->needed_tailroom = 2; /* FCS */
363 dev->mtu = IEEE802154_MTU;
364 dev->tx_queue_len = 10;
365 dev->type = ARPHRD_IEEE802154;
366 dev->flags = IFF_NOARP | IFF_BROADCAST;
367 dev->watchdog_timeo = 0;
368
369 dev->destructor = free_netdev;
370 dev->netdev_ops = &mac802154_wpan_ops;
371 dev->ml_priv = &mac802154_mlme_wpan;
372
373 priv = netdev_priv(dev);
374 priv->type = IEEE802154_DEV_WPAN;
375
376 priv->chan = MAC802154_CHAN_NONE;
377 priv->page = 0;
378
379 spin_lock_init(&priv->mib_lock);
380
381 get_random_bytes(&priv->bsn, 1);
382 get_random_bytes(&priv->dsn, 1);
383
384 priv->pan_id = IEEE802154_PANID_BROADCAST;
385 priv->short_addr = IEEE802154_ADDR_BROADCAST;
386 }
387
388 static int mac802154_process_data(struct net_device *dev, struct sk_buff *skb)
389 {
390 return netif_rx(skb);
391 }
392
393 static int
394 mac802154_subif_frame(struct mac802154_sub_if_data *sdata, struct sk_buff *skb)
395 {
396 pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
397
398 spin_lock_bh(&sdata->mib_lock);
399
400 switch (mac_cb(skb)->da.addr_type) {
401 case IEEE802154_ADDR_NONE:
402 if (mac_cb(skb)->sa.addr_type != IEEE802154_ADDR_NONE)
403 /* FIXME: check if we are PAN coordinator */
404 skb->pkt_type = PACKET_OTHERHOST;
405 else
406 /* ACK comes with both addresses empty */
407 skb->pkt_type = PACKET_HOST;
408 break;
409 case IEEE802154_ADDR_LONG:
410 if (mac_cb(skb)->da.pan_id != sdata->pan_id &&
411 mac_cb(skb)->da.pan_id != IEEE802154_PANID_BROADCAST)
412 skb->pkt_type = PACKET_OTHERHOST;
413 else if (!memcmp(mac_cb(skb)->da.hwaddr, sdata->dev->dev_addr,
414 IEEE802154_ADDR_LEN))
415 skb->pkt_type = PACKET_HOST;
416 else
417 skb->pkt_type = PACKET_OTHERHOST;
418 break;
419 case IEEE802154_ADDR_SHORT:
420 if (mac_cb(skb)->da.pan_id != sdata->pan_id &&
421 mac_cb(skb)->da.pan_id != IEEE802154_PANID_BROADCAST)
422 skb->pkt_type = PACKET_OTHERHOST;
423 else if (mac_cb(skb)->da.short_addr == sdata->short_addr)
424 skb->pkt_type = PACKET_HOST;
425 else if (mac_cb(skb)->da.short_addr ==
426 IEEE802154_ADDR_BROADCAST)
427 skb->pkt_type = PACKET_BROADCAST;
428 else
429 skb->pkt_type = PACKET_OTHERHOST;
430 break;
431 default:
432 break;
433 }
434
435 spin_unlock_bh(&sdata->mib_lock);
436
437 skb->dev = sdata->dev;
438
439 sdata->dev->stats.rx_packets++;
440 sdata->dev->stats.rx_bytes += skb->len;
441
442 switch (mac_cb_type(skb)) {
443 case IEEE802154_FC_TYPE_DATA:
444 return mac802154_process_data(sdata->dev, skb);
445 default:
446 pr_warning("ieee802154: bad frame received (type = %d)\n",
447 mac_cb_type(skb));
448 kfree_skb(skb);
449 return NET_RX_DROP;
450 }
451 }
452
453 static int mac802154_parse_frame_start(struct sk_buff *skb)
454 {
455 u8 *head = skb->data;
456 u16 fc;
457
458 if (mac802154_fetch_skb_u16(skb, &fc) ||
459 mac802154_fetch_skb_u8(skb, &(mac_cb(skb)->seq)))
460 goto err;
461
462 pr_debug("fc: %04x dsn: %02x\n", fc, head[2]);
463
464 mac_cb(skb)->flags = IEEE802154_FC_TYPE(fc);
465 mac_cb(skb)->sa.addr_type = IEEE802154_FC_SAMODE(fc);
466 mac_cb(skb)->da.addr_type = IEEE802154_FC_DAMODE(fc);
467
468 if (fc & IEEE802154_FC_INTRA_PAN)
469 mac_cb(skb)->flags |= MAC_CB_FLAG_INTRAPAN;
470
471 if (mac_cb(skb)->da.addr_type != IEEE802154_ADDR_NONE) {
472 if (mac802154_fetch_skb_u16(skb, &(mac_cb(skb)->da.pan_id)))
473 goto err;
474
475 /* source PAN id compression */
476 if (mac_cb_is_intrapan(skb))
477 mac_cb(skb)->sa.pan_id = mac_cb(skb)->da.pan_id;
478
479 pr_debug("dest PAN addr: %04x\n", mac_cb(skb)->da.pan_id);
480
481 if (mac_cb(skb)->da.addr_type == IEEE802154_ADDR_SHORT) {
482 u16 *da = &(mac_cb(skb)->da.short_addr);
483
484 if (mac802154_fetch_skb_u16(skb, da))
485 goto err;
486
487 pr_debug("destination address is short: %04x\n",
488 mac_cb(skb)->da.short_addr);
489 } else {
490 if (!pskb_may_pull(skb, IEEE802154_ADDR_LEN))
491 goto err;
492
493 mac802154_haddr_copy_swap(mac_cb(skb)->da.hwaddr,
494 skb->data);
495 skb_pull(skb, IEEE802154_ADDR_LEN);
496
497 pr_debug("destination address is hardware\n");
498 }
499 }
500
501 if (mac_cb(skb)->sa.addr_type != IEEE802154_ADDR_NONE) {
502 /* non PAN-compression, fetch source address id */
503 if (!(mac_cb_is_intrapan(skb))) {
504 u16 *sa_pan = &(mac_cb(skb)->sa.pan_id);
505
506 if (mac802154_fetch_skb_u16(skb, sa_pan))
507 goto err;
508 }
509
510 pr_debug("source PAN addr: %04x\n", mac_cb(skb)->da.pan_id);
511
512 if (mac_cb(skb)->sa.addr_type == IEEE802154_ADDR_SHORT) {
513 u16 *sa = &(mac_cb(skb)->sa.short_addr);
514
515 if (mac802154_fetch_skb_u16(skb, sa))
516 goto err;
517
518 pr_debug("source address is short: %04x\n",
519 mac_cb(skb)->sa.short_addr);
520 } else {
521 if (!pskb_may_pull(skb, IEEE802154_ADDR_LEN))
522 goto err;
523
524 mac802154_haddr_copy_swap(mac_cb(skb)->sa.hwaddr,
525 skb->data);
526 skb_pull(skb, IEEE802154_ADDR_LEN);
527
528 pr_debug("source address is hardware\n");
529 }
530 }
531
532 return 0;
533 err:
534 return -EINVAL;
535 }
536
537 void mac802154_wpans_rx(struct mac802154_priv *priv, struct sk_buff *skb)
538 {
539 int ret;
540 struct sk_buff *sskb;
541 struct mac802154_sub_if_data *sdata;
542
543 ret = mac802154_parse_frame_start(skb);
544 if (ret) {
545 pr_debug("got invalid frame\n");
546 return;
547 }
548
549 rcu_read_lock();
550 list_for_each_entry_rcu(sdata, &priv->slaves, list) {
551 if (sdata->type != IEEE802154_DEV_WPAN)
552 continue;
553
554 sskb = skb_clone(skb, GFP_ATOMIC);
555 if (sskb)
556 mac802154_subif_frame(sdata, sskb);
557 }
558 rcu_read_unlock();
559 }
Linux with added FPC-III support