summaryrefslogtreecommitdiffstats
path: root/net/mac802154/wpan.c
blob: 3c3069fd69718277fc719e82d7bf2c51bb9747db (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
/*
 * Copyright 2007-2012 Siemens AG
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Written by:
 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
 * Sergey Lapin <slapin@ossfans.org>
 * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
 */

#include <linux/netdevice.h>
#include <linux/module.h>
#include <linux/if_arp.h>

#include <net/rtnetlink.h>
#include <linux/nl802154.h>
#include <net/af_ieee802154.h>
#include <net/mac802154.h>
#include <net/ieee802154_netdev.h>
#include <net/ieee802154.h>
#include <net/wpan-phy.h>

#include "mac802154.h"

static int mac802154_wpan_update_llsec(struct net_device *dev)
{
	struct mac802154_sub_if_data *priv = netdev_priv(dev);
	struct ieee802154_mlme_ops *ops = ieee802154_mlme_ops(dev);
	int rc = 0;

	if (ops->llsec) {
		struct ieee802154_llsec_params params;
		int changed = 0;

		params.pan_id = priv->pan_id;
		changed |= IEEE802154_LLSEC_PARAM_PAN_ID;

		params.hwaddr = priv->extended_addr;
		changed |= IEEE802154_LLSEC_PARAM_HWADDR;

		rc = ops->llsec->set_params(dev, &params, changed);
	}

	return rc;
}

static int
mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	struct mac802154_sub_if_data *priv = netdev_priv(dev);
	struct sockaddr_ieee802154 *sa =
		(struct sockaddr_ieee802154 *)&ifr->ifr_addr;
	int err = -ENOIOCTLCMD;

	spin_lock_bh(&priv->mib_lock);

	switch (cmd) {
	case SIOCGIFADDR:
	{
		u16 pan_id, short_addr;

		pan_id = le16_to_cpu(priv->pan_id);
		short_addr = le16_to_cpu(priv->short_addr);
		if (pan_id == IEEE802154_PANID_BROADCAST ||
		    short_addr == IEEE802154_ADDR_BROADCAST) {
			err = -EADDRNOTAVAIL;
			break;
		}

		sa->family = AF_IEEE802154;
		sa->addr.addr_type = IEEE802154_ADDR_SHORT;
		sa->addr.pan_id = pan_id;
		sa->addr.short_addr = short_addr;

		err = 0;
		break;
	}
	case SIOCSIFADDR:
		dev_warn(&dev->dev,
			 "Using DEBUGing ioctl SIOCSIFADDR isn't recommened!\n");
		if (sa->family != AF_IEEE802154 ||
		    sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
		    sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
		    sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
		    sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
			err = -EINVAL;
			break;
		}

		priv->pan_id = cpu_to_le16(sa->addr.pan_id);
		priv->short_addr = cpu_to_le16(sa->addr.short_addr);

		err = mac802154_wpan_update_llsec(dev);
		break;
	}

	spin_unlock_bh(&priv->mib_lock);
	return err;
}

static int mac802154_wpan_mac_addr(struct net_device *dev, void *p)
{
	struct sockaddr *addr = p;

	if (netif_running(dev))
		return -EBUSY;

	/* FIXME: validate addr */
	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
	mac802154_dev_set_ieee_addr(dev);
	return mac802154_wpan_update_llsec(dev);
}

int mac802154_set_mac_params(struct net_device *dev,
			     const struct ieee802154_mac_params *params)
{
	struct mac802154_sub_if_data *priv = netdev_priv(dev);

	mutex_lock(&priv->hw->slaves_mtx);
	priv->mac_params = *params;
	mutex_unlock(&priv->hw->slaves_mtx);

	return 0;
}

void mac802154_get_mac_params(struct net_device *dev,
			      struct ieee802154_mac_params *params)
{
	struct mac802154_sub_if_data *priv = netdev_priv(dev);

	mutex_lock(&priv->hw->slaves_mtx);
	*params = priv->mac_params;
	mutex_unlock(&priv->hw->slaves_mtx);
}

static int mac802154_wpan_open(struct net_device *dev)
{
	int rc;
	struct mac802154_sub_if_data *priv = netdev_priv(dev);
	struct wpan_phy *phy = priv->hw->phy;

	rc = mac802154_slave_open(dev);
	if (rc < 0)
		return rc;

	mutex_lock(&phy->pib_lock);

	if (phy->set_txpower) {
		rc = phy->set_txpower(phy, priv->mac_params.transmit_power);
		if (rc < 0)
			goto out;
	}

	if (phy->set_lbt) {
		rc = phy->set_lbt(phy, priv->mac_params.lbt);
		if (rc < 0)
			goto out;
	}

	if (phy->set_cca_mode) {
		rc = phy->set_cca_mode(phy, priv->mac_params.cca_mode);
		if (rc < 0)
			goto out;
	}

	if (phy->set_cca_ed_level) {
		rc = phy->set_cca_ed_level(phy, priv->mac_params.cca_ed_level);
		if (rc < 0)
			goto out;
	}

	if (phy->set_csma_params) {
		rc = phy->set_csma_params(phy, priv->mac_params.min_be,
					  priv->mac_params.max_be,
					  priv->mac_params.csma_retries);
		if (rc < 0)
			goto out;
	}

	if (phy->set_frame_retries) {
		rc = phy->set_frame_retries(phy,
					    priv->mac_params.frame_retries);
		if (rc < 0)
			goto out;
	}

	mutex_unlock(&phy->pib_lock);
	return 0;

out:
	mutex_unlock(&phy->pib_lock);
	return rc;
}

static int mac802154_set_header_security(struct mac802154_sub_if_data *priv,
					 struct ieee802154_hdr *hdr,
					 const struct ieee802154_mac_cb *cb)
{
	struct ieee802154_llsec_params params;
	u8 level;

	mac802154_llsec_get_params(&priv->sec, &params);

	if (!params.enabled && cb->secen_override && cb->secen)
		return -EINVAL;
	if (!params.enabled ||
	    (cb->secen_override && !cb->secen) ||
	    !params.out_level)
		return 0;
	if (cb->seclevel_override && !cb->seclevel)
		return -EINVAL;

	level = cb->seclevel_override ? cb->seclevel : params.out_level;

	hdr->fc.security_enabled = 1;
	hdr->sec.level = level;
	hdr->sec.key_id_mode = params.out_key.mode;
	if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
		hdr->sec.short_src = params.out_key.short_source;
	else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
		hdr->sec.extended_src = params.out_key.extended_source;
	hdr->sec.key_id = params.out_key.id;

	return 0;
}

static int mac802154_header_create(struct sk_buff *skb,
				   struct net_device *dev,
				   unsigned short type,
				   const void *daddr,
				   const void *saddr,
				   unsigned len)
{
	struct ieee802154_hdr hdr;
	struct mac802154_sub_if_data *priv = netdev_priv(dev);
	struct ieee802154_mac_cb *cb = mac_cb(skb);
	int hlen;

	if (!daddr)
		return -EINVAL;

	memset(&hdr.fc, 0, sizeof(hdr.fc));
	hdr.fc.type = cb->type;
	hdr.fc.security_enabled = cb->secen;
	hdr.fc.ack_request = cb->ackreq;
	hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);

	if (mac802154_set_header_security(priv, &hdr, cb) < 0)
		return -EINVAL;

	if (!saddr) {
		spin_lock_bh(&priv->mib_lock);

		if (priv->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
		    priv->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
		    priv->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
			hdr.source.mode = IEEE802154_ADDR_LONG;
			hdr.source.extended_addr = priv->extended_addr;
		} else {
			hdr.source.mode = IEEE802154_ADDR_SHORT;
			hdr.source.short_addr = priv->short_addr;
		}

		hdr.source.pan_id = priv->pan_id;

		spin_unlock_bh(&priv->mib_lock);
	} else {
		hdr.source = *(const struct ieee802154_addr *)saddr;
	}

	hdr.dest = *(const struct ieee802154_addr *)daddr;

	hlen = ieee802154_hdr_push(skb, &hdr);
	if (hlen < 0)
		return -EINVAL;

	skb_reset_mac_header(skb);
	skb->mac_len = hlen;

	if (len > ieee802154_max_payload(&hdr))
		return -EMSGSIZE;

	return hlen;
}

static int
mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
{
	struct ieee802154_hdr hdr;
	struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;

	if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
		pr_debug("malformed packet\n");
		return 0;
	}

	*addr = hdr.source;
	return sizeof(*addr);
}

static netdev_tx_t
mac802154_wpan_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct mac802154_sub_if_data *priv;
	u8 chan, page;
	int rc;

	priv = netdev_priv(dev);

	spin_lock_bh(&priv->mib_lock);
	chan = priv->chan;
	page = priv->page;
	spin_unlock_bh(&priv->mib_lock);

	if (chan == MAC802154_CHAN_NONE ||
	    page >= WPAN_NUM_PAGES ||
	    chan >= WPAN_NUM_CHANNELS) {
		kfree_skb(skb);
		return NETDEV_TX_OK;
	}

	rc = mac802154_llsec_encrypt(&priv->sec, skb);
	if (rc) {
		pr_warn("encryption failed: %i\n", rc);
		kfree_skb(skb);
		return NETDEV_TX_OK;
	}

	skb->skb_iif = dev->ifindex;
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;

	return mac802154_tx(priv->hw, skb, page, chan);
}

static struct header_ops mac802154_header_ops = {
	.create		= mac802154_header_create,
	.parse		= mac802154_header_parse,
};

static const struct net_device_ops mac802154_wpan_ops = {
	.ndo_open		= mac802154_wpan_open,
	.ndo_stop		= mac802154_slave_close,
	.ndo_start_xmit		= mac802154_wpan_xmit,
	.ndo_do_ioctl		= mac802154_wpan_ioctl,
	.ndo_set_mac_address	= mac802154_wpan_mac_addr,
};

static void mac802154_wpan_free(struct net_device *dev)
{
	struct mac802154_sub_if_data *priv = netdev_priv(dev);

	mac802154_llsec_destroy(&priv->sec);

	free_netdev(dev);
}

void mac802154_wpan_setup(struct net_device *dev)
{
	struct mac802154_sub_if_data *priv;

	dev->addr_len		= IEEE802154_ADDR_LEN;
	memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);

	dev->hard_header_len	= MAC802154_FRAME_HARD_HEADER_LEN;
	dev->header_ops		= &mac802154_header_ops;
	dev->needed_tailroom	= 2 + 16; /* FCS + MIC */
	dev->mtu		= IEEE802154_MTU;
	dev->tx_queue_len	= 300;
	dev->type		= ARPHRD_IEEE802154;
	dev->flags		= IFF_NOARP | IFF_BROADCAST;
	dev->watchdog_timeo	= 0;

	dev->destructor		= mac802154_wpan_free;
	dev->netdev_ops		= &mac802154_wpan_ops;
	dev->ml_priv		= &mac802154_mlme_wpan;

	priv = netdev_priv(dev);
	priv->type = IEEE802154_DEV_WPAN;

	priv->chan = MAC802154_CHAN_NONE;
	priv->page = 0;

	spin_lock_init(&priv->mib_lock);
	mutex_init(&priv->sec_mtx);

	get_random_bytes(&priv->bsn, 1);
	get_random_bytes(&priv->dsn, 1);

	/* defaults per 802.15.4-2011 */
	priv->mac_params.min_be = 3;
	priv->mac_params.max_be = 5;
	priv->mac_params.csma_retries = 4;
	priv->mac_params.frame_retries = -1; /* for compatibility, actual default is 3 */

	priv->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
	priv->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);

	mac802154_llsec_init(&priv->sec);
}

static int mac802154_process_data(struct net_device *dev, struct sk_buff *skb)
{
	return netif_rx_ni(skb);
}

static int
mac802154_subif_frame(struct mac802154_sub_if_data *sdata, struct sk_buff *skb,
		      const struct ieee802154_hdr *hdr)
{
	__le16 span, sshort;
	int rc;

	pr_debug("getting packet via slave interface %s\n", sdata->dev->name);

	spin_lock_bh(&sdata->mib_lock);

	span = sdata->pan_id;
	sshort = sdata->short_addr;

	switch (mac_cb(skb)->dest.mode) {
	case IEEE802154_ADDR_NONE:
		if (mac_cb(skb)->dest.mode != IEEE802154_ADDR_NONE)
			/* FIXME: check if we are PAN coordinator */
			skb->pkt_type = PACKET_OTHERHOST;
		else
			/* ACK comes with both addresses empty */
			skb->pkt_type = PACKET_HOST;
		break;
	case IEEE802154_ADDR_LONG:
		if (mac_cb(skb)->dest.pan_id != span &&
		    mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
			skb->pkt_type = PACKET_OTHERHOST;
		else if (mac_cb(skb)->dest.extended_addr == sdata->extended_addr)
			skb->pkt_type = PACKET_HOST;
		else
			skb->pkt_type = PACKET_OTHERHOST;
		break;
	case IEEE802154_ADDR_SHORT:
		if (mac_cb(skb)->dest.pan_id != span &&
		    mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
			skb->pkt_type = PACKET_OTHERHOST;
		else if (mac_cb(skb)->dest.short_addr == sshort)
			skb->pkt_type = PACKET_HOST;
		else if (mac_cb(skb)->dest.short_addr ==
			  cpu_to_le16(IEEE802154_ADDR_BROADCAST))
			skb->pkt_type = PACKET_BROADCAST;
		else
			skb->pkt_type = PACKET_OTHERHOST;
		break;
	default:
		break;
	}

	spin_unlock_bh(&sdata->mib_lock);

	skb->dev = sdata->dev;

	rc = mac802154_llsec_decrypt(&sdata->sec, skb);
	if (rc) {
		pr_debug("decryption failed: %i\n", rc);
		kfree_skb(skb);
		return NET_RX_DROP;
	}

	sdata->dev->stats.rx_packets++;
	sdata->dev->stats.rx_bytes += skb->len;

	switch (mac_cb(skb)->type) {
	case IEEE802154_FC_TYPE_DATA:
		return mac802154_process_data(sdata->dev, skb);
	default:
		pr_warn("ieee802154: bad frame received (type = %d)\n",
			mac_cb(skb)->type);
		kfree_skb(skb);
		return NET_RX_DROP;
	}
}

static void mac802154_print_addr(const char *name,
				 const struct ieee802154_addr *addr)
{
	if (addr->mode == IEEE802154_ADDR_NONE)
		pr_debug("%s not present\n", name);

	pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id));
	if (addr->mode == IEEE802154_ADDR_SHORT) {
		pr_debug("%s is short: %04x\n", name,
			 le16_to_cpu(addr->short_addr));
	} else {
		u64 hw = swab64((__force u64) addr->extended_addr);

		pr_debug("%s is hardware: %8phC\n", name, &hw);
	}
}

static int mac802154_parse_frame_start(struct sk_buff *skb,
				       struct ieee802154_hdr *hdr)
{
	int hlen;
	struct ieee802154_mac_cb *cb = mac_cb_init(skb);

	hlen = ieee802154_hdr_pull(skb, hdr);
	if (hlen < 0)
		return -EINVAL;

	skb->mac_len = hlen;

	pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc),
		 hdr->seq);

	cb->type = hdr->fc.type;
	cb->ackreq = hdr->fc.ack_request;
	cb->secen = hdr->fc.security_enabled;

	mac802154_print_addr("destination", &hdr->dest);
	mac802154_print_addr("source", &hdr->source);

	cb->source = hdr->source;
	cb->dest = hdr->dest;

	if (hdr->fc.security_enabled) {
		u64 key;

		pr_debug("seclevel %i\n", hdr->sec.level);

		switch (hdr->sec.key_id_mode) {
		case IEEE802154_SCF_KEY_IMPLICIT:
			pr_debug("implicit key\n");
			break;

		case IEEE802154_SCF_KEY_INDEX:
			pr_debug("key %02x\n", hdr->sec.key_id);
			break;

		case IEEE802154_SCF_KEY_SHORT_INDEX:
			pr_debug("key %04x:%04x %02x\n",
				 le32_to_cpu(hdr->sec.short_src) >> 16,
				 le32_to_cpu(hdr->sec.short_src) & 0xffff,
				 hdr->sec.key_id);
			break;

		case IEEE802154_SCF_KEY_HW_INDEX:
			key = swab64((__force u64) hdr->sec.extended_src);
			pr_debug("key source %8phC %02x\n", &key,
				 hdr->sec.key_id);
			break;
		}
	}

	return 0;
}

void mac802154_wpans_rx(struct mac802154_priv *priv, struct sk_buff *skb)
{
	int ret;
	struct mac802154_sub_if_data *sdata;
	struct ieee802154_hdr hdr;

	ret = mac802154_parse_frame_start(skb, &hdr);
	if (ret) {
		pr_debug("got invalid frame\n");
		return;
	}

	rcu_read_lock();
	list_for_each_entry_rcu(sdata, &priv->slaves, list) {
		if (sdata->type != IEEE802154_DEV_WPAN ||
		    !netif_running(sdata->dev))
			continue;

		mac802154_subif_frame(sdata, skb, &hdr);
		skb = NULL;
		break;
	}
	rcu_read_unlock();

	if (skb)
		kfree_skb(skb);
}
OpenPOWER on IntegriCloud