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 
mac802154_wpan_update_llsec(struct net_device * dev)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
mac802154_wpan_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)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 
mac802154_wpan_mac_addr(struct net_device * dev,void * p)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 	dev_addr_set(dev, addr->sa_data);
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 		dev_addr_set(sdata->wpan_dev.lowpan_dev, dev->dev_addr);
140 
141 	return mac802154_wpan_update_llsec(dev);
142 }
143 
ieee802154_setup_hw(struct ieee802154_sub_if_data * sdata)144 static int ieee802154_setup_hw(struct ieee802154_sub_if_data *sdata)
145 {
146 	struct ieee802154_local *local = sdata->local;
147 	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
148 	int ret;
149 
150 	if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
151 		ret = drv_set_promiscuous_mode(local,
152 					       wpan_dev->promiscuous_mode);
153 		if (ret < 0)
154 			return ret;
155 	}
156 
157 	if (local->hw.flags & IEEE802154_HW_AFILT) {
158 		ret = drv_set_pan_id(local, wpan_dev->pan_id);
159 		if (ret < 0)
160 			return ret;
161 
162 		ret = drv_set_extended_addr(local, wpan_dev->extended_addr);
163 		if (ret < 0)
164 			return ret;
165 
166 		ret = drv_set_short_addr(local, wpan_dev->short_addr);
167 		if (ret < 0)
168 			return ret;
169 	}
170 
171 	if (local->hw.flags & IEEE802154_HW_LBT) {
172 		ret = drv_set_lbt_mode(local, wpan_dev->lbt);
173 		if (ret < 0)
174 			return ret;
175 	}
176 
177 	if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
178 		ret = drv_set_csma_params(local, wpan_dev->min_be,
179 					  wpan_dev->max_be,
180 					  wpan_dev->csma_retries);
181 		if (ret < 0)
182 			return ret;
183 	}
184 
185 	if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
186 		ret = drv_set_max_frame_retries(local, wpan_dev->frame_retries);
187 		if (ret < 0)
188 			return ret;
189 	}
190 
191 	return 0;
192 }
193 
mac802154_slave_open(struct net_device * dev)194 static int mac802154_slave_open(struct net_device *dev)
195 {
196 	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
197 	struct ieee802154_local *local = sdata->local;
198 	int res;
199 
200 	ASSERT_RTNL();
201 
202 	set_bit(SDATA_STATE_RUNNING, &sdata->state);
203 
204 	if (!local->open_count) {
205 		res = ieee802154_setup_hw(sdata);
206 		if (res)
207 			goto err;
208 
209 		res = drv_start(local);
210 		if (res)
211 			goto err;
212 	}
213 
214 	local->open_count++;
215 	netif_start_queue(dev);
216 	return 0;
217 err:
218 	/* might already be clear but that doesn't matter */
219 	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
220 
221 	return res;
222 }
223 
224 static int
ieee802154_check_mac_settings(struct ieee802154_local * local,struct wpan_dev * wpan_dev,struct wpan_dev * nwpan_dev)225 ieee802154_check_mac_settings(struct ieee802154_local *local,
226 			      struct wpan_dev *wpan_dev,
227 			      struct wpan_dev *nwpan_dev)
228 {
229 	ASSERT_RTNL();
230 
231 	if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
232 		if (wpan_dev->promiscuous_mode != nwpan_dev->promiscuous_mode)
233 			return -EBUSY;
234 	}
235 
236 	if (local->hw.flags & IEEE802154_HW_AFILT) {
237 		if (wpan_dev->pan_id != nwpan_dev->pan_id ||
238 		    wpan_dev->short_addr != nwpan_dev->short_addr ||
239 		    wpan_dev->extended_addr != nwpan_dev->extended_addr)
240 			return -EBUSY;
241 	}
242 
243 	if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
244 		if (wpan_dev->min_be != nwpan_dev->min_be ||
245 		    wpan_dev->max_be != nwpan_dev->max_be ||
246 		    wpan_dev->csma_retries != nwpan_dev->csma_retries)
247 			return -EBUSY;
248 	}
249 
250 	if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
251 		if (wpan_dev->frame_retries != nwpan_dev->frame_retries)
252 			return -EBUSY;
253 	}
254 
255 	if (local->hw.flags & IEEE802154_HW_LBT) {
256 		if (wpan_dev->lbt != nwpan_dev->lbt)
257 			return -EBUSY;
258 	}
259 
260 	return 0;
261 }
262 
263 static int
ieee802154_check_concurrent_iface(struct ieee802154_sub_if_data * sdata,enum nl802154_iftype iftype)264 ieee802154_check_concurrent_iface(struct ieee802154_sub_if_data *sdata,
265 				  enum nl802154_iftype iftype)
266 {
267 	struct ieee802154_local *local = sdata->local;
268 	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
269 	struct ieee802154_sub_if_data *nsdata;
270 
271 	/* we hold the RTNL here so can safely walk the list */
272 	list_for_each_entry(nsdata, &local->interfaces, list) {
273 		if (nsdata != sdata && ieee802154_sdata_running(nsdata)) {
274 			int ret;
275 
276 			/* TODO currently we don't support multiple node types
277 			 * we need to run skb_clone at rx path. Check if there
278 			 * exist really an use case if we need to support
279 			 * multiple node types at the same time.
280 			 */
281 			if (wpan_dev->iftype == NL802154_IFTYPE_NODE &&
282 			    nsdata->wpan_dev.iftype == NL802154_IFTYPE_NODE)
283 				return -EBUSY;
284 
285 			/* check all phy mac sublayer settings are the same.
286 			 * We have only one phy, different values makes trouble.
287 			 */
288 			ret = ieee802154_check_mac_settings(local, wpan_dev,
289 							    &nsdata->wpan_dev);
290 			if (ret < 0)
291 				return ret;
292 		}
293 	}
294 
295 	return 0;
296 }
297 
mac802154_wpan_open(struct net_device * dev)298 static int mac802154_wpan_open(struct net_device *dev)
299 {
300 	int rc;
301 	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
302 	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
303 
304 	rc = ieee802154_check_concurrent_iface(sdata, wpan_dev->iftype);
305 	if (rc < 0)
306 		return rc;
307 
308 	return mac802154_slave_open(dev);
309 }
310 
mac802154_slave_close(struct net_device * dev)311 static int mac802154_slave_close(struct net_device *dev)
312 {
313 	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
314 	struct ieee802154_local *local = sdata->local;
315 
316 	ASSERT_RTNL();
317 
318 	netif_stop_queue(dev);
319 	local->open_count--;
320 
321 	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
322 
323 	if (!local->open_count)
324 		ieee802154_stop_device(local);
325 
326 	return 0;
327 }
328 
mac802154_set_header_security(struct ieee802154_sub_if_data * sdata,struct ieee802154_hdr * hdr,const struct ieee802154_mac_cb * cb)329 static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
330 					 struct ieee802154_hdr *hdr,
331 					 const struct ieee802154_mac_cb *cb)
332 {
333 	struct ieee802154_llsec_params params;
334 	u8 level;
335 
336 	mac802154_llsec_get_params(&sdata->sec, &params);
337 
338 	if (!params.enabled && cb->secen_override && cb->secen)
339 		return -EINVAL;
340 	if (!params.enabled ||
341 	    (cb->secen_override && !cb->secen) ||
342 	    !params.out_level)
343 		return 0;
344 	if (cb->seclevel_override && !cb->seclevel)
345 		return -EINVAL;
346 
347 	level = cb->seclevel_override ? cb->seclevel : params.out_level;
348 
349 	hdr->fc.security_enabled = 1;
350 	hdr->sec.level = level;
351 	hdr->sec.key_id_mode = params.out_key.mode;
352 	if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
353 		hdr->sec.short_src = params.out_key.short_source;
354 	else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
355 		hdr->sec.extended_src = params.out_key.extended_source;
356 	hdr->sec.key_id = params.out_key.id;
357 
358 	return 0;
359 }
360 
ieee802154_header_create(struct sk_buff * skb,struct net_device * dev,const struct ieee802154_addr * daddr,const struct ieee802154_addr * saddr,unsigned len)361 static int ieee802154_header_create(struct sk_buff *skb,
362 				    struct net_device *dev,
363 				    const struct ieee802154_addr *daddr,
364 				    const struct ieee802154_addr *saddr,
365 				    unsigned len)
366 {
367 	struct ieee802154_hdr hdr;
368 	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
369 	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
370 	struct ieee802154_mac_cb *cb = mac_cb(skb);
371 	int hlen;
372 
373 	if (!daddr)
374 		return -EINVAL;
375 
376 	memset(&hdr.fc, 0, sizeof(hdr.fc));
377 	hdr.fc.type = cb->type;
378 	hdr.fc.security_enabled = cb->secen;
379 	hdr.fc.ack_request = cb->ackreq;
380 	hdr.seq = atomic_inc_return(&dev->ieee802154_ptr->dsn) & 0xFF;
381 
382 	if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
383 		return -EINVAL;
384 
385 	if (!saddr) {
386 		if (wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
387 		    wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
388 		    wpan_dev->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
389 			hdr.source.mode = IEEE802154_ADDR_LONG;
390 			hdr.source.extended_addr = wpan_dev->extended_addr;
391 		} else {
392 			hdr.source.mode = IEEE802154_ADDR_SHORT;
393 			hdr.source.short_addr = wpan_dev->short_addr;
394 		}
395 
396 		hdr.source.pan_id = wpan_dev->pan_id;
397 	} else {
398 		hdr.source = *(const struct ieee802154_addr *)saddr;
399 	}
400 
401 	hdr.dest = *(const struct ieee802154_addr *)daddr;
402 
403 	hlen = ieee802154_hdr_push(skb, &hdr);
404 	if (hlen < 0)
405 		return -EINVAL;
406 
407 	skb_reset_mac_header(skb);
408 	skb->mac_len = hlen;
409 
410 	if (len > ieee802154_max_payload(&hdr))
411 		return -EMSGSIZE;
412 
413 	return hlen;
414 }
415 
416 static const struct wpan_dev_header_ops ieee802154_header_ops = {
417 	.create		= ieee802154_header_create,
418 };
419 
420 /* This header create functionality assumes a 8 byte array for
421  * source and destination pointer at maximum. To adapt this for
422  * the 802.15.4 dataframe header we use extended address handling
423  * here only and intra pan connection. fc fields are mostly fallback
424  * handling. For provide dev_hard_header for dgram sockets.
425  */
mac802154_header_create(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned len)426 static int mac802154_header_create(struct sk_buff *skb,
427 				   struct net_device *dev,
428 				   unsigned short type,
429 				   const void *daddr,
430 				   const void *saddr,
431 				   unsigned len)
432 {
433 	struct ieee802154_hdr hdr;
434 	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
435 	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
436 	struct ieee802154_mac_cb cb = { };
437 	int hlen;
438 
439 	if (!daddr)
440 		return -EINVAL;
441 
442 	memset(&hdr.fc, 0, sizeof(hdr.fc));
443 	hdr.fc.type = IEEE802154_FC_TYPE_DATA;
444 	hdr.fc.ack_request = wpan_dev->ackreq;
445 	hdr.seq = atomic_inc_return(&dev->ieee802154_ptr->dsn) & 0xFF;
446 
447 	/* TODO currently a workaround to give zero cb block to set
448 	 * security parameters defaults according MIB.
449 	 */
450 	if (mac802154_set_header_security(sdata, &hdr, &cb) < 0)
451 		return -EINVAL;
452 
453 	hdr.dest.pan_id = wpan_dev->pan_id;
454 	hdr.dest.mode = IEEE802154_ADDR_LONG;
455 	ieee802154_be64_to_le64(&hdr.dest.extended_addr, daddr);
456 
457 	hdr.source.pan_id = hdr.dest.pan_id;
458 	hdr.source.mode = IEEE802154_ADDR_LONG;
459 
460 	if (!saddr)
461 		hdr.source.extended_addr = wpan_dev->extended_addr;
462 	else
463 		ieee802154_be64_to_le64(&hdr.source.extended_addr, saddr);
464 
465 	hlen = ieee802154_hdr_push(skb, &hdr);
466 	if (hlen < 0)
467 		return -EINVAL;
468 
469 	skb_reset_mac_header(skb);
470 	skb->mac_len = hlen;
471 
472 	if (len > ieee802154_max_payload(&hdr))
473 		return -EMSGSIZE;
474 
475 	return hlen;
476 }
477 
478 static int
mac802154_header_parse(const struct sk_buff * skb,unsigned char * haddr)479 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
480 {
481 	struct ieee802154_hdr hdr;
482 
483 	if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
484 		pr_debug("malformed packet\n");
485 		return 0;
486 	}
487 
488 	if (hdr.source.mode == IEEE802154_ADDR_LONG) {
489 		ieee802154_le64_to_be64(haddr, &hdr.source.extended_addr);
490 		return IEEE802154_EXTENDED_ADDR_LEN;
491 	}
492 
493 	return 0;
494 }
495 
496 static const struct header_ops mac802154_header_ops = {
497 	.create         = mac802154_header_create,
498 	.parse          = mac802154_header_parse,
499 };
500 
501 static const struct net_device_ops mac802154_wpan_ops = {
502 	.ndo_open		= mac802154_wpan_open,
503 	.ndo_stop		= mac802154_slave_close,
504 	.ndo_start_xmit		= ieee802154_subif_start_xmit,
505 	.ndo_do_ioctl		= mac802154_wpan_ioctl,
506 	.ndo_set_mac_address	= mac802154_wpan_mac_addr,
507 };
508 
509 static const struct net_device_ops mac802154_monitor_ops = {
510 	.ndo_open		= mac802154_wpan_open,
511 	.ndo_stop		= mac802154_slave_close,
512 	.ndo_start_xmit		= ieee802154_monitor_start_xmit,
513 };
514 
mac802154_wpan_free(struct net_device * dev)515 static void mac802154_wpan_free(struct net_device *dev)
516 {
517 	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
518 
519 	mac802154_llsec_destroy(&sdata->sec);
520 }
521 
ieee802154_if_setup(struct net_device * dev)522 static void ieee802154_if_setup(struct net_device *dev)
523 {
524 	dev->addr_len		= IEEE802154_EXTENDED_ADDR_LEN;
525 	memset(dev->broadcast, 0xff, IEEE802154_EXTENDED_ADDR_LEN);
526 
527 	/* Let hard_header_len set to IEEE802154_MIN_HEADER_LEN. AF_PACKET
528 	 * will not send frames without any payload, but ack frames
529 	 * has no payload, so substract one that we can send a 3 bytes
530 	 * frame. The xmit callback assumes at least a hard header where two
531 	 * bytes fc and sequence field are set.
532 	 */
533 	dev->hard_header_len	= IEEE802154_MIN_HEADER_LEN - 1;
534 	/* The auth_tag header is for security and places in private payload
535 	 * room of mac frame which stucks between payload and FCS field.
536 	 */
537 	dev->needed_tailroom	= IEEE802154_MAX_AUTH_TAG_LEN +
538 				  IEEE802154_FCS_LEN;
539 	/* The mtu size is the payload without mac header in this case.
540 	 * We have a dynamic length header with a minimum header length
541 	 * which is hard_header_len. In this case we let mtu to the size
542 	 * of maximum payload which is IEEE802154_MTU - IEEE802154_FCS_LEN -
543 	 * hard_header_len. The FCS which is set by hardware or ndo_start_xmit
544 	 * and the minimum mac header which can be evaluated inside driver
545 	 * layer. The rest of mac header will be part of payload if greater
546 	 * than hard_header_len.
547 	 */
548 	dev->mtu		= IEEE802154_MTU - IEEE802154_FCS_LEN -
549 				  dev->hard_header_len;
550 	dev->tx_queue_len	= 300;
551 	dev->flags		= IFF_NOARP | IFF_BROADCAST;
552 }
553 
554 static int
ieee802154_setup_sdata(struct ieee802154_sub_if_data * sdata,enum nl802154_iftype type)555 ieee802154_setup_sdata(struct ieee802154_sub_if_data *sdata,
556 		       enum nl802154_iftype type)
557 {
558 	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
559 	int ret;
560 	u8 tmp;
561 
562 	/* set some type-dependent values */
563 	sdata->wpan_dev.iftype = type;
564 
565 	get_random_bytes(&tmp, sizeof(tmp));
566 	atomic_set(&wpan_dev->bsn, tmp);
567 	get_random_bytes(&tmp, sizeof(tmp));
568 	atomic_set(&wpan_dev->dsn, tmp);
569 
570 	/* defaults per 802.15.4-2011 */
571 	wpan_dev->min_be = 3;
572 	wpan_dev->max_be = 5;
573 	wpan_dev->csma_retries = 4;
574 	wpan_dev->frame_retries = 3;
575 
576 	wpan_dev->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
577 	wpan_dev->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
578 
579 	switch (type) {
580 	case NL802154_IFTYPE_NODE:
581 		ieee802154_be64_to_le64(&wpan_dev->extended_addr,
582 					sdata->dev->dev_addr);
583 
584 		sdata->dev->header_ops = &mac802154_header_ops;
585 		sdata->dev->needs_free_netdev = true;
586 		sdata->dev->priv_destructor = mac802154_wpan_free;
587 		sdata->dev->netdev_ops = &mac802154_wpan_ops;
588 		sdata->dev->ml_priv = &mac802154_mlme_wpan;
589 		wpan_dev->promiscuous_mode = false;
590 		wpan_dev->header_ops = &ieee802154_header_ops;
591 
592 		mutex_init(&sdata->sec_mtx);
593 
594 		mac802154_llsec_init(&sdata->sec);
595 		ret = mac802154_wpan_update_llsec(sdata->dev);
596 		if (ret < 0)
597 			return ret;
598 
599 		break;
600 	case NL802154_IFTYPE_MONITOR:
601 		sdata->dev->needs_free_netdev = true;
602 		sdata->dev->netdev_ops = &mac802154_monitor_ops;
603 		wpan_dev->promiscuous_mode = true;
604 		break;
605 	default:
606 		BUG();
607 	}
608 
609 	return 0;
610 }
611 
612 struct net_device *
ieee802154_if_add(struct ieee802154_local * local,const char * name,unsigned char name_assign_type,enum nl802154_iftype type,__le64 extended_addr)613 ieee802154_if_add(struct ieee802154_local *local, const char *name,
614 		  unsigned char name_assign_type, enum nl802154_iftype type,
615 		  __le64 extended_addr)
616 {
617 	u8 addr[IEEE802154_EXTENDED_ADDR_LEN];
618 	struct net_device *ndev = NULL;
619 	struct ieee802154_sub_if_data *sdata = NULL;
620 	int ret;
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(addr, &extended_addr);
643 			dev_addr_set(ndev, addr);
644 		} else {
645 			dev_addr_set(ndev, ndev->perm_addr);
646 		}
647 		break;
648 	case NL802154_IFTYPE_MONITOR:
649 		ndev->type = ARPHRD_IEEE802154_MONITOR;
650 		break;
651 	default:
652 		ret = -EINVAL;
653 		goto err;
654 	}
655 
656 	/* TODO check this */
657 	SET_NETDEV_DEV(ndev, &local->phy->dev);
658 	dev_net_set(ndev, wpan_phy_net(local->hw.phy));
659 	sdata = netdev_priv(ndev);
660 	ndev->ieee802154_ptr = &sdata->wpan_dev;
661 	memcpy(sdata->name, ndev->name, IFNAMSIZ);
662 	sdata->dev = ndev;
663 	sdata->wpan_dev.wpan_phy = local->hw.phy;
664 	sdata->local = local;
665 
666 	/* setup type-dependent data */
667 	ret = ieee802154_setup_sdata(sdata, type);
668 	if (ret)
669 		goto err;
670 
671 	ret = register_netdevice(ndev);
672 	if (ret < 0)
673 		goto err;
674 
675 	mutex_lock(&local->iflist_mtx);
676 	list_add_tail_rcu(&sdata->list, &local->interfaces);
677 	mutex_unlock(&local->iflist_mtx);
678 
679 	return ndev;
680 
681 err:
682 	free_netdev(ndev);
683 	return ERR_PTR(ret);
684 }
685 
ieee802154_if_remove(struct ieee802154_sub_if_data * sdata)686 void ieee802154_if_remove(struct ieee802154_sub_if_data *sdata)
687 {
688 	ASSERT_RTNL();
689 
690 	mutex_lock(&sdata->local->iflist_mtx);
691 	list_del_rcu(&sdata->list);
692 	mutex_unlock(&sdata->local->iflist_mtx);
693 
694 	synchronize_rcu();
695 	unregister_netdevice(sdata->dev);
696 }
697 
ieee802154_remove_interfaces(struct ieee802154_local * local)698 void ieee802154_remove_interfaces(struct ieee802154_local *local)
699 {
700 	struct ieee802154_sub_if_data *sdata, *tmp;
701 
702 	mutex_lock(&local->iflist_mtx);
703 	list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
704 		list_del(&sdata->list);
705 
706 		unregister_netdevice(sdata->dev);
707 	}
708 	mutex_unlock(&local->iflist_mtx);
709 }
710 
netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)711 static int netdev_notify(struct notifier_block *nb,
712 			 unsigned long state, void *ptr)
713 {
714 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
715 	struct ieee802154_sub_if_data *sdata;
716 
717 	if (state != NETDEV_CHANGENAME)
718 		return NOTIFY_DONE;
719 
720 	if (!dev->ieee802154_ptr || !dev->ieee802154_ptr->wpan_phy)
721 		return NOTIFY_DONE;
722 
723 	if (dev->ieee802154_ptr->wpan_phy->privid != mac802154_wpan_phy_privid)
724 		return NOTIFY_DONE;
725 
726 	sdata = IEEE802154_DEV_TO_SUB_IF(dev);
727 	memcpy(sdata->name, dev->name, IFNAMSIZ);
728 
729 	return NOTIFY_OK;
730 }
731 
732 static struct notifier_block mac802154_netdev_notifier = {
733 	.notifier_call = netdev_notify,
734 };
735 
ieee802154_iface_init(void)736 int ieee802154_iface_init(void)
737 {
738 	return register_netdevice_notifier(&mac802154_netdev_notifier);
739 }
740 
ieee802154_iface_exit(void)741 void ieee802154_iface_exit(void)
742 {
743 	unregister_netdevice_notifier(&mac802154_netdev_notifier);
744 }
745