blob: 372d8a222b9184e2881d108a087cf9ebaad768e6 [file] [log] [blame]
alex.bluesman.smirnov@gmail.com32bad7e2012-06-25 23:24:48 +00001/*
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
38static 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];
Alexander Aringf458c642013-02-05 04:25:35 +000044 skb_pull(skb, 1);
alex.bluesman.smirnov@gmail.com32bad7e2012-06-25 23:24:48 +000045
46 return 0;
47}
48
49static 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
60static 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
67static int
68mac802154_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
115static 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
128static 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;
Alexander Aring25060d82013-02-05 10:23:44 +0000140 u8 head[MAC802154_FRAME_HARD_HEADER_LEN];
alex.bluesman.smirnov@gmail.com32bad7e2012-06-25 23:24:48 +0000141 u16 fc;
142
143 if (!daddr)
144 return -EINVAL;
145
alex.bluesman.smirnov@gmail.com32bad7e2012-06-25 23:24:48 +0000146 head[pos++] = mac_cb(skb)->seq; /* DSN/BSN */
147 fc = mac_cb_type(skb);
Tony Cheneaucf692062013-03-25 17:59:24 +0000148 if (mac_cb_is_ackreq(skb))
149 fc |= IEEE802154_FC_ACK_REQ;
alex.bluesman.smirnov@gmail.com32bad7e2012-06-25 23:24:48 +0000150
151 if (!saddr) {
152 spin_lock_bh(&priv->mib_lock);
153
154 if (priv->short_addr == IEEE802154_ADDR_BROADCAST ||
155 priv->short_addr == IEEE802154_ADDR_UNDEF ||
156 priv->pan_id == IEEE802154_PANID_BROADCAST) {
157 dev_addr.addr_type = IEEE802154_ADDR_LONG;
158 memcpy(dev_addr.hwaddr, dev->dev_addr,
159 IEEE802154_ADDR_LEN);
160 } else {
161 dev_addr.addr_type = IEEE802154_ADDR_SHORT;
162 dev_addr.short_addr = priv->short_addr;
163 }
164
165 dev_addr.pan_id = priv->pan_id;
166 saddr = &dev_addr;
167
168 spin_unlock_bh(&priv->mib_lock);
169 }
170
171 if (daddr->addr_type != IEEE802154_ADDR_NONE) {
172 fc |= (daddr->addr_type << IEEE802154_FC_DAMODE_SHIFT);
173
174 head[pos++] = daddr->pan_id & 0xff;
175 head[pos++] = daddr->pan_id >> 8;
176
177 if (daddr->addr_type == IEEE802154_ADDR_SHORT) {
178 head[pos++] = daddr->short_addr & 0xff;
179 head[pos++] = daddr->short_addr >> 8;
180 } else {
181 mac802154_haddr_copy_swap(head + pos, daddr->hwaddr);
182 pos += IEEE802154_ADDR_LEN;
183 }
184 }
185
186 if (saddr->addr_type != IEEE802154_ADDR_NONE) {
187 fc |= (saddr->addr_type << IEEE802154_FC_SAMODE_SHIFT);
188
189 if ((saddr->pan_id == daddr->pan_id) &&
190 (saddr->pan_id != IEEE802154_PANID_BROADCAST)) {
191 /* PANID compression/intra PAN */
192 fc |= IEEE802154_FC_INTRA_PAN;
193 } else {
194 head[pos++] = saddr->pan_id & 0xff;
195 head[pos++] = saddr->pan_id >> 8;
196 }
197
198 if (saddr->addr_type == IEEE802154_ADDR_SHORT) {
199 head[pos++] = saddr->short_addr & 0xff;
200 head[pos++] = saddr->short_addr >> 8;
201 } else {
202 mac802154_haddr_copy_swap(head + pos, saddr->hwaddr);
203 pos += IEEE802154_ADDR_LEN;
204 }
205 }
206
207 head[0] = fc;
208 head[1] = fc >> 8;
209
210 memcpy(skb_push(skb, pos), head, pos);
Alexander Aring3e691622013-10-30 09:18:22 +0100211 skb_reset_mac_header(skb);
212 skb->mac_len = pos;
alex.bluesman.smirnov@gmail.com32bad7e2012-06-25 23:24:48 +0000213
214 return pos;
215}
216
217static int
218mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
219{
220 const u8 *hdr = skb_mac_header(skb);
221 const u8 *tail = skb_tail_pointer(skb);
222 struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
223 u16 fc;
224 int da_type;
225
226 if (hdr + 3 > tail)
227 goto malformed;
228
229 fc = hdr[0] | (hdr[1] << 8);
230
231 hdr += 3;
232
233 da_type = IEEE802154_FC_DAMODE(fc);
234 addr->addr_type = IEEE802154_FC_SAMODE(fc);
235
236 switch (da_type) {
237 case IEEE802154_ADDR_NONE:
238 if (fc & IEEE802154_FC_INTRA_PAN)
239 goto malformed;
240 break;
241 case IEEE802154_ADDR_LONG:
242 if (fc & IEEE802154_FC_INTRA_PAN) {
243 if (hdr + 2 > tail)
244 goto malformed;
245 addr->pan_id = hdr[0] | (hdr[1] << 8);
246 hdr += 2;
247 }
248
249 if (hdr + IEEE802154_ADDR_LEN > tail)
250 goto malformed;
251
252 hdr += IEEE802154_ADDR_LEN;
253 break;
254 case IEEE802154_ADDR_SHORT:
255 if (fc & IEEE802154_FC_INTRA_PAN) {
256 if (hdr + 2 > tail)
257 goto malformed;
258 addr->pan_id = hdr[0] | (hdr[1] << 8);
259 hdr += 2;
260 }
261
262 if (hdr + 2 > tail)
263 goto malformed;
264
265 hdr += 2;
266 break;
267 default:
268 goto malformed;
269
270 }
271
272 switch (addr->addr_type) {
273 case IEEE802154_ADDR_NONE:
274 break;
275 case IEEE802154_ADDR_LONG:
276 if (!(fc & IEEE802154_FC_INTRA_PAN)) {
277 if (hdr + 2 > tail)
278 goto malformed;
279 addr->pan_id = hdr[0] | (hdr[1] << 8);
280 hdr += 2;
281 }
282
283 if (hdr + IEEE802154_ADDR_LEN > tail)
284 goto malformed;
285
286 mac802154_haddr_copy_swap(addr->hwaddr, hdr);
287 hdr += IEEE802154_ADDR_LEN;
288 break;
289 case IEEE802154_ADDR_SHORT:
290 if (!(fc & IEEE802154_FC_INTRA_PAN)) {
291 if (hdr + 2 > tail)
292 goto malformed;
293 addr->pan_id = hdr[0] | (hdr[1] << 8);
294 hdr += 2;
295 }
296
297 if (hdr + 2 > tail)
298 goto malformed;
299
300 addr->short_addr = hdr[0] | (hdr[1] << 8);
301 hdr += 2;
302 break;
303 default:
304 goto malformed;
305 }
306
307 return sizeof(struct ieee802154_addr);
308
309malformed:
310 pr_debug("malformed packet\n");
311 return 0;
312}
313
314static netdev_tx_t
315mac802154_wpan_xmit(struct sk_buff *skb, struct net_device *dev)
316{
317 struct mac802154_sub_if_data *priv;
318 u8 chan, page;
319
320 priv = netdev_priv(dev);
321
322 spin_lock_bh(&priv->mib_lock);
323 chan = priv->chan;
324 page = priv->page;
325 spin_unlock_bh(&priv->mib_lock);
326
327 if (chan == MAC802154_CHAN_NONE ||
328 page >= WPAN_NUM_PAGES ||
Alan Ottfcefbe92012-11-29 18:25:10 +0000329 chan >= WPAN_NUM_CHANNELS) {
330 kfree_skb(skb);
alex.bluesman.smirnov@gmail.com32bad7e2012-06-25 23:24:48 +0000331 return NETDEV_TX_OK;
Alan Ottfcefbe92012-11-29 18:25:10 +0000332 }
alex.bluesman.smirnov@gmail.com32bad7e2012-06-25 23:24:48 +0000333
334 skb->skb_iif = dev->ifindex;
335 dev->stats.tx_packets++;
336 dev->stats.tx_bytes += skb->len;
337
338 return mac802154_tx(priv->hw, skb, page, chan);
339}
340
341static struct header_ops mac802154_header_ops = {
342 .create = mac802154_header_create,
343 .parse = mac802154_header_parse,
344};
345
346static const struct net_device_ops mac802154_wpan_ops = {
347 .ndo_open = mac802154_slave_open,
348 .ndo_stop = mac802154_slave_close,
349 .ndo_start_xmit = mac802154_wpan_xmit,
350 .ndo_do_ioctl = mac802154_wpan_ioctl,
351 .ndo_set_mac_address = mac802154_wpan_mac_addr,
352};
353
354void mac802154_wpan_setup(struct net_device *dev)
355{
356 struct mac802154_sub_if_data *priv;
357
358 dev->addr_len = IEEE802154_ADDR_LEN;
359 memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
360
361 dev->hard_header_len = MAC802154_FRAME_HARD_HEADER_LEN;
362 dev->header_ops = &mac802154_header_ops;
363 dev->needed_tailroom = 2; /* FCS */
364 dev->mtu = IEEE802154_MTU;
Alan Otte937f5832013-04-03 04:00:57 +0000365 dev->tx_queue_len = 300;
alex.bluesman.smirnov@gmail.com32bad7e2012-06-25 23:24:48 +0000366 dev->type = ARPHRD_IEEE802154;
367 dev->flags = IFF_NOARP | IFF_BROADCAST;
368 dev->watchdog_timeo = 0;
369
370 dev->destructor = free_netdev;
371 dev->netdev_ops = &mac802154_wpan_ops;
372 dev->ml_priv = &mac802154_mlme_wpan;
373
374 priv = netdev_priv(dev);
375 priv->type = IEEE802154_DEV_WPAN;
376
377 priv->chan = MAC802154_CHAN_NONE;
378 priv->page = 0;
379
380 spin_lock_init(&priv->mib_lock);
381
382 get_random_bytes(&priv->bsn, 1);
383 get_random_bytes(&priv->dsn, 1);
384
385 priv->pan_id = IEEE802154_PANID_BROADCAST;
386 priv->short_addr = IEEE802154_ADDR_BROADCAST;
387}
388
389static int mac802154_process_data(struct net_device *dev, struct sk_buff *skb)
390{
Alexander Aring5ff3fec2013-01-02 01:01:10 +0000391 return netif_rx_ni(skb);
alex.bluesman.smirnov@gmail.com32bad7e2012-06-25 23:24:48 +0000392}
393
394static int
395mac802154_subif_frame(struct mac802154_sub_if_data *sdata, struct sk_buff *skb)
396{
397 pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
398
399 spin_lock_bh(&sdata->mib_lock);
400
401 switch (mac_cb(skb)->da.addr_type) {
402 case IEEE802154_ADDR_NONE:
403 if (mac_cb(skb)->sa.addr_type != IEEE802154_ADDR_NONE)
404 /* FIXME: check if we are PAN coordinator */
405 skb->pkt_type = PACKET_OTHERHOST;
406 else
407 /* ACK comes with both addresses empty */
408 skb->pkt_type = PACKET_HOST;
409 break;
410 case IEEE802154_ADDR_LONG:
411 if (mac_cb(skb)->da.pan_id != sdata->pan_id &&
412 mac_cb(skb)->da.pan_id != IEEE802154_PANID_BROADCAST)
413 skb->pkt_type = PACKET_OTHERHOST;
414 else if (!memcmp(mac_cb(skb)->da.hwaddr, sdata->dev->dev_addr,
415 IEEE802154_ADDR_LEN))
416 skb->pkt_type = PACKET_HOST;
417 else
418 skb->pkt_type = PACKET_OTHERHOST;
419 break;
420 case IEEE802154_ADDR_SHORT:
421 if (mac_cb(skb)->da.pan_id != sdata->pan_id &&
422 mac_cb(skb)->da.pan_id != IEEE802154_PANID_BROADCAST)
423 skb->pkt_type = PACKET_OTHERHOST;
424 else if (mac_cb(skb)->da.short_addr == sdata->short_addr)
425 skb->pkt_type = PACKET_HOST;
426 else if (mac_cb(skb)->da.short_addr ==
427 IEEE802154_ADDR_BROADCAST)
428 skb->pkt_type = PACKET_BROADCAST;
429 else
430 skb->pkt_type = PACKET_OTHERHOST;
431 break;
432 default:
433 break;
434 }
435
436 spin_unlock_bh(&sdata->mib_lock);
437
438 skb->dev = sdata->dev;
439
440 sdata->dev->stats.rx_packets++;
441 sdata->dev->stats.rx_bytes += skb->len;
442
443 switch (mac_cb_type(skb)) {
444 case IEEE802154_FC_TYPE_DATA:
445 return mac802154_process_data(sdata->dev, skb);
446 default:
Weilong Chen2cc33c72013-12-19 09:22:26 +0800447 pr_warn("ieee802154: bad frame received (type = %d)\n",
448 mac_cb_type(skb));
alex.bluesman.smirnov@gmail.com32bad7e2012-06-25 23:24:48 +0000449 kfree_skb(skb);
450 return NET_RX_DROP;
451 }
452}
453
454static int mac802154_parse_frame_start(struct sk_buff *skb)
455{
456 u8 *head = skb->data;
457 u16 fc;
458
459 if (mac802154_fetch_skb_u16(skb, &fc) ||
460 mac802154_fetch_skb_u8(skb, &(mac_cb(skb)->seq)))
461 goto err;
462
463 pr_debug("fc: %04x dsn: %02x\n", fc, head[2]);
464
465 mac_cb(skb)->flags = IEEE802154_FC_TYPE(fc);
466 mac_cb(skb)->sa.addr_type = IEEE802154_FC_SAMODE(fc);
467 mac_cb(skb)->da.addr_type = IEEE802154_FC_DAMODE(fc);
468
469 if (fc & IEEE802154_FC_INTRA_PAN)
470 mac_cb(skb)->flags |= MAC_CB_FLAG_INTRAPAN;
471
472 if (mac_cb(skb)->da.addr_type != IEEE802154_ADDR_NONE) {
473 if (mac802154_fetch_skb_u16(skb, &(mac_cb(skb)->da.pan_id)))
474 goto err;
475
476 /* source PAN id compression */
477 if (mac_cb_is_intrapan(skb))
478 mac_cb(skb)->sa.pan_id = mac_cb(skb)->da.pan_id;
479
480 pr_debug("dest PAN addr: %04x\n", mac_cb(skb)->da.pan_id);
481
482 if (mac_cb(skb)->da.addr_type == IEEE802154_ADDR_SHORT) {
483 u16 *da = &(mac_cb(skb)->da.short_addr);
484
485 if (mac802154_fetch_skb_u16(skb, da))
486 goto err;
487
488 pr_debug("destination address is short: %04x\n",
489 mac_cb(skb)->da.short_addr);
490 } else {
491 if (!pskb_may_pull(skb, IEEE802154_ADDR_LEN))
492 goto err;
493
494 mac802154_haddr_copy_swap(mac_cb(skb)->da.hwaddr,
495 skb->data);
496 skb_pull(skb, IEEE802154_ADDR_LEN);
497
498 pr_debug("destination address is hardware\n");
499 }
500 }
501
502 if (mac_cb(skb)->sa.addr_type != IEEE802154_ADDR_NONE) {
503 /* non PAN-compression, fetch source address id */
504 if (!(mac_cb_is_intrapan(skb))) {
505 u16 *sa_pan = &(mac_cb(skb)->sa.pan_id);
506
507 if (mac802154_fetch_skb_u16(skb, sa_pan))
508 goto err;
509 }
510
511 pr_debug("source PAN addr: %04x\n", mac_cb(skb)->da.pan_id);
512
513 if (mac_cb(skb)->sa.addr_type == IEEE802154_ADDR_SHORT) {
514 u16 *sa = &(mac_cb(skb)->sa.short_addr);
515
516 if (mac802154_fetch_skb_u16(skb, sa))
517 goto err;
518
519 pr_debug("source address is short: %04x\n",
520 mac_cb(skb)->sa.short_addr);
521 } else {
522 if (!pskb_may_pull(skb, IEEE802154_ADDR_LEN))
523 goto err;
524
525 mac802154_haddr_copy_swap(mac_cb(skb)->sa.hwaddr,
526 skb->data);
527 skb_pull(skb, IEEE802154_ADDR_LEN);
528
529 pr_debug("source address is hardware\n");
530 }
531 }
532
533 return 0;
534err:
535 return -EINVAL;
536}
537
538void mac802154_wpans_rx(struct mac802154_priv *priv, struct sk_buff *skb)
539{
540 int ret;
541 struct sk_buff *sskb;
542 struct mac802154_sub_if_data *sdata;
543
544 ret = mac802154_parse_frame_start(skb);
545 if (ret) {
546 pr_debug("got invalid frame\n");
547 return;
548 }
549
550 rcu_read_lock();
551 list_for_each_entry_rcu(sdata, &priv->slaves, list) {
552 if (sdata->type != IEEE802154_DEV_WPAN)
553 continue;
554
555 sskb = skb_clone(skb, GFP_ATOMIC);
556 if (sskb)
557 mac802154_subif_frame(sdata, sskb);
558 }
559 rcu_read_unlock();
560}