xref: /linux/net/mac802154/iface.c (revision 37744feebc086908fd89760650f458ab19071750)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2007-2012 Siemens AG
4  *
5  * Written by:
6  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
7  * Sergey Lapin <slapin@ossfans.org>
8  * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
9  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
10  */
11 
12 #include <linux/netdevice.h>
13 #include <linux/module.h>
14 #include <linux/if_arp.h>
15 #include <linux/ieee802154.h>
16 
17 #include <net/nl802154.h>
18 #include <net/mac802154.h>
19 #include <net/ieee802154_netdev.h>
20 #include <net/cfg802154.h>
21 
22 #include "ieee802154_i.h"
23 #include "driver-ops.h"
24 
25 int mac802154_wpan_update_llsec(struct net_device *dev)
26 {
27 	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
28 	struct ieee802154_mlme_ops *ops = ieee802154_mlme_ops(dev);
29 	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
30 	int rc = 0;
31 
32 	if (ops->llsec) {
33 		struct ieee802154_llsec_params params;
34 		int changed = 0;
35 
36 		params.pan_id = wpan_dev->pan_id;
37 		changed |= IEEE802154_LLSEC_PARAM_PAN_ID;
38 
39 		params.hwaddr = wpan_dev->extended_addr;
40 		changed |= IEEE802154_LLSEC_PARAM_HWADDR;
41 
42 		rc = ops->llsec->set_params(dev, &params, changed);
43 	}
44 
45 	return rc;
46 }
47 
48 static int
49 mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
50 {
51 	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
52 	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
53 	struct sockaddr_ieee802154 *sa =
54 		(struct sockaddr_ieee802154 *)&ifr->ifr_addr;
55 	int err = -ENOIOCTLCMD;
56 
57 	if (cmd != SIOCGIFADDR && cmd != SIOCSIFADDR)
58 		return err;
59 
60 	rtnl_lock();
61 
62 	switch (cmd) {
63 	case SIOCGIFADDR:
64 	{
65 		u16 pan_id, short_addr;
66 
67 		pan_id = le16_to_cpu(wpan_dev->pan_id);
68 		short_addr = le16_to_cpu(wpan_dev->short_addr);
69 		if (pan_id == IEEE802154_PANID_BROADCAST ||
70 		    short_addr == IEEE802154_ADDR_BROADCAST) {
71 			err = -EADDRNOTAVAIL;
72 			break;
73 		}
74 
75 		sa->family = AF_IEEE802154;
76 		sa->addr.addr_type = IEEE802154_ADDR_SHORT;
77 		sa->addr.pan_id = pan_id;
78 		sa->addr.short_addr = short_addr;
79 
80 		err = 0;
81 		break;
82 	}
83 	case SIOCSIFADDR:
84 		if (netif_running(dev)) {
85 			rtnl_unlock();
86 			return -EBUSY;
87 		}
88 
89 		dev_warn(&dev->dev,
90 			 "Using DEBUGing ioctl SIOCSIFADDR isn't recommended!\n");
91 		if (sa->family != AF_IEEE802154 ||
92 		    sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
93 		    sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
94 		    sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
95 		    sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
96 			err = -EINVAL;
97 			break;
98 		}
99 
100 		wpan_dev->pan_id = cpu_to_le16(sa->addr.pan_id);
101 		wpan_dev->short_addr = cpu_to_le16(sa->addr.short_addr);
102 
103 		err = mac802154_wpan_update_llsec(dev);
104 		break;
105 	}
106 
107 	rtnl_unlock();
108 	return err;
109 }
110 
111 static int mac802154_wpan_mac_addr(struct net_device *dev, void *p)
112 {
113 	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
114 	struct sockaddr *addr = p;
115 	__le64 extended_addr;
116 
117 	if (netif_running(dev))
118 		return -EBUSY;
119 
120 	/* lowpan need to be down for update
121 	 * SLAAC address after ifup
122 	 */
123 	if (sdata->wpan_dev.lowpan_dev) {
124 		if (netif_running(sdata->wpan_dev.lowpan_dev))
125 			return -EBUSY;
126 	}
127 
128 	ieee802154_be64_to_le64(&extended_addr, addr->sa_data);
129 	if (!ieee802154_is_valid_extended_unicast_addr(extended_addr))
130 		return -EINVAL;
131 
132 	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
133 	sdata->wpan_dev.extended_addr = extended_addr;
134 
135 	/* update lowpan interface mac address when
136 	 * wpan mac has been changed
137 	 */
138 	if (sdata->wpan_dev.lowpan_dev)
139 		memcpy(sdata->wpan_dev.lowpan_dev->dev_addr, dev->dev_addr,
140 		       dev->addr_len);
141 
142 	return mac802154_wpan_update_llsec(dev);
143 }
144 
145 static int ieee802154_setup_hw(struct ieee802154_sub_if_data *sdata)
146 {
147 	struct ieee802154_local *local = sdata->local;
148 	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
149 	int ret;
150 
151 	if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
152 		ret = drv_set_promiscuous_mode(local,
153 					       wpan_dev->promiscuous_mode);
154 		if (ret < 0)
155 			return ret;
156 	}
157 
158 	if (local->hw.flags & IEEE802154_HW_AFILT) {
159 		ret = drv_set_pan_id(local, wpan_dev->pan_id);
160 		if (ret < 0)
161 			return ret;
162 
163 		ret = drv_set_extended_addr(local, wpan_dev->extended_addr);
164 		if (ret < 0)
165 			return ret;
166 
167 		ret = drv_set_short_addr(local, wpan_dev->short_addr);
168 		if (ret < 0)
169 			return ret;
170 	}
171 
172 	if (local->hw.flags & IEEE802154_HW_LBT) {
173 		ret = drv_set_lbt_mode(local, wpan_dev->lbt);
174 		if (ret < 0)
175 			return ret;
176 	}
177 
178 	if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
179 		ret = drv_set_csma_params(local, wpan_dev->min_be,
180 					  wpan_dev->max_be,
181 					  wpan_dev->csma_retries);
182 		if (ret < 0)
183 			return ret;
184 	}
185 
186 	if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
187 		ret = drv_set_max_frame_retries(local, wpan_dev->frame_retries);
188 		if (ret < 0)
189 			return ret;
190 	}
191 
192 	return 0;
193 }
194 
195 static int mac802154_slave_open(struct net_device *dev)
196 {
197 	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
198 	struct ieee802154_local *local = sdata->local;
199 	int res;
200 
201 	ASSERT_RTNL();
202 
203 	set_bit(SDATA_STATE_RUNNING, &sdata->state);
204 
205 	if (!local->open_count) {
206 		res = ieee802154_setup_hw(sdata);
207 		if (res)
208 			goto err;
209 
210 		res = drv_start(local);
211 		if (res)
212 			goto err;
213 	}
214 
215 	local->open_count++;
216 	netif_start_queue(dev);
217 	return 0;
218 err:
219 	/* might already be clear but that doesn't matter */
220 	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
221 
222 	return res;
223 }
224 
225 static int
226 ieee802154_check_mac_settings(struct ieee802154_local *local,
227 			      struct wpan_dev *wpan_dev,
228 			      struct wpan_dev *nwpan_dev)
229 {
230 	ASSERT_RTNL();
231 
232 	if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
233 		if (wpan_dev->promiscuous_mode != nwpan_dev->promiscuous_mode)
234 			return -EBUSY;
235 	}
236 
237 	if (local->hw.flags & IEEE802154_HW_AFILT) {
238 		if (wpan_dev->pan_id != nwpan_dev->pan_id ||
239 		    wpan_dev->short_addr != nwpan_dev->short_addr ||
240 		    wpan_dev->extended_addr != nwpan_dev->extended_addr)
241 			return -EBUSY;
242 	}
243 
244 	if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
245 		if (wpan_dev->min_be != nwpan_dev->min_be ||
246 		    wpan_dev->max_be != nwpan_dev->max_be ||
247 		    wpan_dev->csma_retries != nwpan_dev->csma_retries)
248 			return -EBUSY;
249 	}
250 
251 	if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
252 		if (wpan_dev->frame_retries != nwpan_dev->frame_retries)
253 			return -EBUSY;
254 	}
255 
256 	if (local->hw.flags & IEEE802154_HW_LBT) {
257 		if (wpan_dev->lbt != nwpan_dev->lbt)
258 			return -EBUSY;
259 	}
260 
261 	return 0;
262 }
263 
264 static int
265 ieee802154_check_concurrent_iface(struct ieee802154_sub_if_data *sdata,
266 				  enum nl802154_iftype iftype)
267 {
268 	struct ieee802154_local *local = sdata->local;
269 	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
270 	struct ieee802154_sub_if_data *nsdata;
271 
272 	/* we hold the RTNL here so can safely walk the list */
273 	list_for_each_entry(nsdata, &local->interfaces, list) {
274 		if (nsdata != sdata && ieee802154_sdata_running(nsdata)) {
275 			int ret;
276 
277 			/* TODO currently we don't support multiple node types
278 			 * we need to run skb_clone at rx path. Check if there
279 			 * exist really an use case if we need to support
280 			 * multiple node types at the same time.
281 			 */
282 			if (wpan_dev->iftype == NL802154_IFTYPE_NODE &&
283 			    nsdata->wpan_dev.iftype == NL802154_IFTYPE_NODE)
284 				return -EBUSY;
285 
286 			/* check all phy mac sublayer settings are the same.
287 			 * We have only one phy, different values makes trouble.
288 			 */
289 			ret = ieee802154_check_mac_settings(local, wpan_dev,
290 							    &nsdata->wpan_dev);
291 			if (ret < 0)
292 				return ret;
293 		}
294 	}
295 
296 	return 0;
297 }
298 
299 static int mac802154_wpan_open(struct net_device *dev)
300 {
301 	int rc;
302 	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
303 	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
304 
305 	rc = ieee802154_check_concurrent_iface(sdata, wpan_dev->iftype);
306 	if (rc < 0)
307 		return rc;
308 
309 	return mac802154_slave_open(dev);
310 }
311 
312 static int mac802154_slave_close(struct net_device *dev)
313 {
314 	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
315 	struct ieee802154_local *local = sdata->local;
316 
317 	ASSERT_RTNL();
318 
319 	netif_stop_queue(dev);
320 	local->open_count--;
321 
322 	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
323 
324 	if (!local->open_count)
325 		ieee802154_stop_device(local);
326 
327 	return 0;
328 }
329 
330 static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
331 					 struct ieee802154_hdr *hdr,
332 					 const struct ieee802154_mac_cb *cb)
333 {
334 	struct ieee802154_llsec_params params;
335 	u8 level;
336 
337 	mac802154_llsec_get_params(&sdata->sec, &params);
338 
339 	if (!params.enabled && cb->secen_override && cb->secen)
340 		return -EINVAL;
341 	if (!params.enabled ||
342 	    (cb->secen_override && !cb->secen) ||
343 	    !params.out_level)
344 		return 0;
345 	if (cb->seclevel_override && !cb->seclevel)
346 		return -EINVAL;
347 
348 	level = cb->seclevel_override ? cb->seclevel : params.out_level;
349 
350 	hdr->fc.security_enabled = 1;
351 	hdr->sec.level = level;
352 	hdr->sec.key_id_mode = params.out_key.mode;
353 	if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
354 		hdr->sec.short_src = params.out_key.short_source;
355 	else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
356 		hdr->sec.extended_src = params.out_key.extended_source;
357 	hdr->sec.key_id = params.out_key.id;
358 
359 	return 0;
360 }
361 
362 static int ieee802154_header_create(struct sk_buff *skb,
363 				    struct net_device *dev,
364 				    const struct ieee802154_addr *daddr,
365 				    const struct ieee802154_addr *saddr,
366 				    unsigned len)
367 {
368 	struct ieee802154_hdr hdr;
369 	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
370 	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
371 	struct ieee802154_mac_cb *cb = mac_cb(skb);
372 	int hlen;
373 
374 	if (!daddr)
375 		return -EINVAL;
376 
377 	memset(&hdr.fc, 0, sizeof(hdr.fc));
378 	hdr.fc.type = cb->type;
379 	hdr.fc.security_enabled = cb->secen;
380 	hdr.fc.ack_request = cb->ackreq;
381 	hdr.seq = atomic_inc_return(&dev->ieee802154_ptr->dsn) & 0xFF;
382 
383 	if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
384 		return -EINVAL;
385 
386 	if (!saddr) {
387 		if (wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
388 		    wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
389 		    wpan_dev->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
390 			hdr.source.mode = IEEE802154_ADDR_LONG;
391 			hdr.source.extended_addr = wpan_dev->extended_addr;
392 		} else {
393 			hdr.source.mode = IEEE802154_ADDR_SHORT;
394 			hdr.source.short_addr = wpan_dev->short_addr;
395 		}
396 
397 		hdr.source.pan_id = wpan_dev->pan_id;
398 	} else {
399 		hdr.source = *(const struct ieee802154_addr *)saddr;
400 	}
401 
402 	hdr.dest = *(const struct ieee802154_addr *)daddr;
403 
404 	hlen = ieee802154_hdr_push(skb, &hdr);
405 	if (hlen < 0)
406 		return -EINVAL;
407 
408 	skb_reset_mac_header(skb);
409 	skb->mac_len = hlen;
410 
411 	if (len > ieee802154_max_payload(&hdr))
412 		return -EMSGSIZE;
413 
414 	return hlen;
415 }
416 
417 static const struct wpan_dev_header_ops ieee802154_header_ops = {
418 	.create		= ieee802154_header_create,
419 };
420 
421 /* This header create functionality assumes a 8 byte array for
422  * source and destination pointer at maximum. To adapt this for
423  * the 802.15.4 dataframe header we use extended address handling
424  * here only and intra pan connection. fc fields are mostly fallback
425  * handling. For provide dev_hard_header for dgram sockets.
426  */
427 static int mac802154_header_create(struct sk_buff *skb,
428 				   struct net_device *dev,
429 				   unsigned short type,
430 				   const void *daddr,
431 				   const void *saddr,
432 				   unsigned len)
433 {
434 	struct ieee802154_hdr hdr;
435 	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
436 	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
437 	struct ieee802154_mac_cb cb = { };
438 	int hlen;
439 
440 	if (!daddr)
441 		return -EINVAL;
442 
443 	memset(&hdr.fc, 0, sizeof(hdr.fc));
444 	hdr.fc.type = IEEE802154_FC_TYPE_DATA;
445 	hdr.fc.ack_request = wpan_dev->ackreq;
446 	hdr.seq = atomic_inc_return(&dev->ieee802154_ptr->dsn) & 0xFF;
447 
448 	/* TODO currently a workaround to give zero cb block to set
449 	 * security parameters defaults according MIB.
450 	 */
451 	if (mac802154_set_header_security(sdata, &hdr, &cb) < 0)
452 		return -EINVAL;
453 
454 	hdr.dest.pan_id = wpan_dev->pan_id;
455 	hdr.dest.mode = IEEE802154_ADDR_LONG;
456 	ieee802154_be64_to_le64(&hdr.dest.extended_addr, daddr);
457 
458 	hdr.source.pan_id = hdr.dest.pan_id;
459 	hdr.source.mode = IEEE802154_ADDR_LONG;
460 
461 	if (!saddr)
462 		hdr.source.extended_addr = wpan_dev->extended_addr;
463 	else
464 		ieee802154_be64_to_le64(&hdr.source.extended_addr, saddr);
465 
466 	hlen = ieee802154_hdr_push(skb, &hdr);
467 	if (hlen < 0)
468 		return -EINVAL;
469 
470 	skb_reset_mac_header(skb);
471 	skb->mac_len = hlen;
472 
473 	if (len > ieee802154_max_payload(&hdr))
474 		return -EMSGSIZE;
475 
476 	return hlen;
477 }
478 
479 static int
480 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
481 {
482 	struct ieee802154_hdr hdr;
483 
484 	if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
485 		pr_debug("malformed packet\n");
486 		return 0;
487 	}
488 
489 	if (hdr.source.mode == IEEE802154_ADDR_LONG) {
490 		ieee802154_le64_to_be64(haddr, &hdr.source.extended_addr);
491 		return IEEE802154_EXTENDED_ADDR_LEN;
492 	}
493 
494 	return 0;
495 }
496 
497 static const struct header_ops mac802154_header_ops = {
498 	.create         = mac802154_header_create,
499 	.parse          = mac802154_header_parse,
500 };
501 
502 static const struct net_device_ops mac802154_wpan_ops = {
503 	.ndo_open		= mac802154_wpan_open,
504 	.ndo_stop		= mac802154_slave_close,
505 	.ndo_start_xmit		= ieee802154_subif_start_xmit,
506 	.ndo_do_ioctl		= mac802154_wpan_ioctl,
507 	.ndo_set_mac_address	= mac802154_wpan_mac_addr,
508 };
509 
510 static const struct net_device_ops mac802154_monitor_ops = {
511 	.ndo_open		= mac802154_wpan_open,
512 	.ndo_stop		= mac802154_slave_close,
513 	.ndo_start_xmit		= ieee802154_monitor_start_xmit,
514 };
515 
516 static void mac802154_wpan_free(struct net_device *dev)
517 {
518 	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
519 
520 	mac802154_llsec_destroy(&sdata->sec);
521 }
522 
523 static void ieee802154_if_setup(struct net_device *dev)
524 {
525 	dev->addr_len		= IEEE802154_EXTENDED_ADDR_LEN;
526 	memset(dev->broadcast, 0xff, IEEE802154_EXTENDED_ADDR_LEN);
527 
528 	/* Let hard_header_len set to IEEE802154_MIN_HEADER_LEN. AF_PACKET
529 	 * will not send frames without any payload, but ack frames
530 	 * has no payload, so substract one that we can send a 3 bytes
531 	 * frame. The xmit callback assumes at least a hard header where two
532 	 * bytes fc and sequence field are set.
533 	 */
534 	dev->hard_header_len	= IEEE802154_MIN_HEADER_LEN - 1;
535 	/* The auth_tag header is for security and places in private payload
536 	 * room of mac frame which stucks between payload and FCS field.
537 	 */
538 	dev->needed_tailroom	= IEEE802154_MAX_AUTH_TAG_LEN +
539 				  IEEE802154_FCS_LEN;
540 	/* The mtu size is the payload without mac header in this case.
541 	 * We have a dynamic length header with a minimum header length
542 	 * which is hard_header_len. In this case we let mtu to the size
543 	 * of maximum payload which is IEEE802154_MTU - IEEE802154_FCS_LEN -
544 	 * hard_header_len. The FCS which is set by hardware or ndo_start_xmit
545 	 * and the minimum mac header which can be evaluated inside driver
546 	 * layer. The rest of mac header will be part of payload if greater
547 	 * than hard_header_len.
548 	 */
549 	dev->mtu		= IEEE802154_MTU - IEEE802154_FCS_LEN -
550 				  dev->hard_header_len;
551 	dev->tx_queue_len	= 300;
552 	dev->flags		= IFF_NOARP | IFF_BROADCAST;
553 }
554 
555 static int
556 ieee802154_setup_sdata(struct ieee802154_sub_if_data *sdata,
557 		       enum nl802154_iftype type)
558 {
559 	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
560 	int ret;
561 	u8 tmp;
562 
563 	/* set some type-dependent values */
564 	sdata->wpan_dev.iftype = type;
565 
566 	get_random_bytes(&tmp, sizeof(tmp));
567 	atomic_set(&wpan_dev->bsn, tmp);
568 	get_random_bytes(&tmp, sizeof(tmp));
569 	atomic_set(&wpan_dev->dsn, tmp);
570 
571 	/* defaults per 802.15.4-2011 */
572 	wpan_dev->min_be = 3;
573 	wpan_dev->max_be = 5;
574 	wpan_dev->csma_retries = 4;
575 	wpan_dev->frame_retries = 3;
576 
577 	wpan_dev->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
578 	wpan_dev->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
579 
580 	switch (type) {
581 	case NL802154_IFTYPE_NODE:
582 		ieee802154_be64_to_le64(&wpan_dev->extended_addr,
583 					sdata->dev->dev_addr);
584 
585 		sdata->dev->header_ops = &mac802154_header_ops;
586 		sdata->dev->needs_free_netdev = true;
587 		sdata->dev->priv_destructor = mac802154_wpan_free;
588 		sdata->dev->netdev_ops = &mac802154_wpan_ops;
589 		sdata->dev->ml_priv = &mac802154_mlme_wpan;
590 		wpan_dev->promiscuous_mode = false;
591 		wpan_dev->header_ops = &ieee802154_header_ops;
592 
593 		mutex_init(&sdata->sec_mtx);
594 
595 		mac802154_llsec_init(&sdata->sec);
596 		ret = mac802154_wpan_update_llsec(sdata->dev);
597 		if (ret < 0)
598 			return ret;
599 
600 		break;
601 	case NL802154_IFTYPE_MONITOR:
602 		sdata->dev->needs_free_netdev = true;
603 		sdata->dev->netdev_ops = &mac802154_monitor_ops;
604 		wpan_dev->promiscuous_mode = true;
605 		break;
606 	default:
607 		BUG();
608 	}
609 
610 	return 0;
611 }
612 
613 struct net_device *
614 ieee802154_if_add(struct ieee802154_local *local, const char *name,
615 		  unsigned char name_assign_type, enum nl802154_iftype type,
616 		  __le64 extended_addr)
617 {
618 	struct net_device *ndev = NULL;
619 	struct ieee802154_sub_if_data *sdata = NULL;
620 	int ret = -ENOMEM;
621 
622 	ASSERT_RTNL();
623 
624 	ndev = alloc_netdev(sizeof(*sdata), name,
625 			    name_assign_type, ieee802154_if_setup);
626 	if (!ndev)
627 		return ERR_PTR(-ENOMEM);
628 
629 	ndev->needed_headroom = local->hw.extra_tx_headroom +
630 				IEEE802154_MAX_HEADER_LEN;
631 
632 	ret = dev_alloc_name(ndev, ndev->name);
633 	if (ret < 0)
634 		goto err;
635 
636 	ieee802154_le64_to_be64(ndev->perm_addr,
637 				&local->hw.phy->perm_extended_addr);
638 	switch (type) {
639 	case NL802154_IFTYPE_NODE:
640 		ndev->type = ARPHRD_IEEE802154;
641 		if (ieee802154_is_valid_extended_unicast_addr(extended_addr))
642 			ieee802154_le64_to_be64(ndev->dev_addr, &extended_addr);
643 		else
644 			memcpy(ndev->dev_addr, ndev->perm_addr,
645 			       IEEE802154_EXTENDED_ADDR_LEN);
646 		break;
647 	case NL802154_IFTYPE_MONITOR:
648 		ndev->type = ARPHRD_IEEE802154_MONITOR;
649 		break;
650 	default:
651 		ret = -EINVAL;
652 		goto err;
653 	}
654 
655 	/* TODO check this */
656 	SET_NETDEV_DEV(ndev, &local->phy->dev);
657 	dev_net_set(ndev, wpan_phy_net(local->hw.phy));
658 	sdata = netdev_priv(ndev);
659 	ndev->ieee802154_ptr = &sdata->wpan_dev;
660 	memcpy(sdata->name, ndev->name, IFNAMSIZ);
661 	sdata->dev = ndev;
662 	sdata->wpan_dev.wpan_phy = local->hw.phy;
663 	sdata->local = local;
664 
665 	/* setup type-dependent data */
666 	ret = ieee802154_setup_sdata(sdata, type);
667 	if (ret)
668 		goto err;
669 
670 	ret = register_netdevice(ndev);
671 	if (ret < 0)
672 		goto err;
673 
674 	mutex_lock(&local->iflist_mtx);
675 	list_add_tail_rcu(&sdata->list, &local->interfaces);
676 	mutex_unlock(&local->iflist_mtx);
677 
678 	return ndev;
679 
680 err:
681 	free_netdev(ndev);
682 	return ERR_PTR(ret);
683 }
684 
685 void ieee802154_if_remove(struct ieee802154_sub_if_data *sdata)
686 {
687 	ASSERT_RTNL();
688 
689 	mutex_lock(&sdata->local->iflist_mtx);
690 	list_del_rcu(&sdata->list);
691 	mutex_unlock(&sdata->local->iflist_mtx);
692 
693 	synchronize_rcu();
694 	unregister_netdevice(sdata->dev);
695 }
696 
697 void ieee802154_remove_interfaces(struct ieee802154_local *local)
698 {
699 	struct ieee802154_sub_if_data *sdata, *tmp;
700 
701 	mutex_lock(&local->iflist_mtx);
702 	list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
703 		list_del(&sdata->list);
704 
705 		unregister_netdevice(sdata->dev);
706 	}
707 	mutex_unlock(&local->iflist_mtx);
708 }
709 
710 static int netdev_notify(struct notifier_block *nb,
711 			 unsigned long state, void *ptr)
712 {
713 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
714 	struct ieee802154_sub_if_data *sdata;
715 
716 	if (state != NETDEV_CHANGENAME)
717 		return NOTIFY_DONE;
718 
719 	if (!dev->ieee802154_ptr || !dev->ieee802154_ptr->wpan_phy)
720 		return NOTIFY_DONE;
721 
722 	if (dev->ieee802154_ptr->wpan_phy->privid != mac802154_wpan_phy_privid)
723 		return NOTIFY_DONE;
724 
725 	sdata = IEEE802154_DEV_TO_SUB_IF(dev);
726 	memcpy(sdata->name, dev->name, IFNAMSIZ);
727 
728 	return NOTIFY_OK;
729 }
730 
731 static struct notifier_block mac802154_netdev_notifier = {
732 	.notifier_call = netdev_notify,
733 };
734 
735 int ieee802154_iface_init(void)
736 {
737 	return register_netdevice_notifier(&mac802154_netdev_notifier);
738 }
739 
740 void ieee802154_iface_exit(void)
741 {
742 	unregister_netdevice_notifier(&mac802154_netdev_notifier);
743 }
744