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Linux/net/mac802154/iface.c

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  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  * Written by:
 14  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
 15  * Sergey Lapin <slapin@ossfans.org>
 16  * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
 17  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
 18  */
 19 
 20 #include <linux/netdevice.h>
 21 #include <linux/module.h>
 22 #include <linux/if_arp.h>
 23 #include <linux/ieee802154.h>
 24 
 25 #include <net/nl802154.h>
 26 #include <net/mac802154.h>
 27 #include <net/ieee802154_netdev.h>
 28 #include <net/cfg802154.h>
 29 
 30 #include "ieee802154_i.h"
 31 #include "driver-ops.h"
 32 
 33 int mac802154_wpan_update_llsec(struct net_device *dev)
 34 {
 35         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 36         struct ieee802154_mlme_ops *ops = ieee802154_mlme_ops(dev);
 37         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 38         int rc = 0;
 39 
 40         if (ops->llsec) {
 41                 struct ieee802154_llsec_params params;
 42                 int changed = 0;
 43 
 44                 params.pan_id = wpan_dev->pan_id;
 45                 changed |= IEEE802154_LLSEC_PARAM_PAN_ID;
 46 
 47                 params.hwaddr = wpan_dev->extended_addr;
 48                 changed |= IEEE802154_LLSEC_PARAM_HWADDR;
 49 
 50                 rc = ops->llsec->set_params(dev, &params, changed);
 51         }
 52 
 53         return rc;
 54 }
 55 
 56 static int
 57 mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 58 {
 59         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 60         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 61         struct sockaddr_ieee802154 *sa =
 62                 (struct sockaddr_ieee802154 *)&ifr->ifr_addr;
 63         int err = -ENOIOCTLCMD;
 64 
 65         if (cmd != SIOCGIFADDR && cmd != SIOCSIFADDR)
 66                 return err;
 67 
 68         rtnl_lock();
 69 
 70         switch (cmd) {
 71         case SIOCGIFADDR:
 72         {
 73                 u16 pan_id, short_addr;
 74 
 75                 pan_id = le16_to_cpu(wpan_dev->pan_id);
 76                 short_addr = le16_to_cpu(wpan_dev->short_addr);
 77                 if (pan_id == IEEE802154_PANID_BROADCAST ||
 78                     short_addr == IEEE802154_ADDR_BROADCAST) {
 79                         err = -EADDRNOTAVAIL;
 80                         break;
 81                 }
 82 
 83                 sa->family = AF_IEEE802154;
 84                 sa->addr.addr_type = IEEE802154_ADDR_SHORT;
 85                 sa->addr.pan_id = pan_id;
 86                 sa->addr.short_addr = short_addr;
 87 
 88                 err = 0;
 89                 break;
 90         }
 91         case SIOCSIFADDR:
 92                 if (netif_running(dev)) {
 93                         rtnl_unlock();
 94                         return -EBUSY;
 95                 }
 96 
 97                 dev_warn(&dev->dev,
 98                          "Using DEBUGing ioctl SIOCSIFADDR isn't recommended!\n");
 99                 if (sa->family != AF_IEEE802154 ||
100                     sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
101                     sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
102                     sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
103                     sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
104                         err = -EINVAL;
105                         break;
106                 }
107 
108                 wpan_dev->pan_id = cpu_to_le16(sa->addr.pan_id);
109                 wpan_dev->short_addr = cpu_to_le16(sa->addr.short_addr);
110 
111                 err = mac802154_wpan_update_llsec(dev);
112                 break;
113         }
114 
115         rtnl_unlock();
116         return err;
117 }
118 
119 static int mac802154_wpan_mac_addr(struct net_device *dev, void *p)
120 {
121         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
122         struct sockaddr *addr = p;
123         __le64 extended_addr;
124 
125         if (netif_running(dev))
126                 return -EBUSY;
127 
128         /* lowpan need to be down for update
129          * SLAAC address after ifup
130          */
131         if (sdata->wpan_dev.lowpan_dev) {
132                 if (netif_running(sdata->wpan_dev.lowpan_dev))
133                         return -EBUSY;
134         }
135 
136         ieee802154_be64_to_le64(&extended_addr, addr->sa_data);
137         if (!ieee802154_is_valid_extended_unicast_addr(extended_addr))
138                 return -EINVAL;
139 
140         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
141         sdata->wpan_dev.extended_addr = extended_addr;
142 
143         /* update lowpan interface mac address when
144          * wpan mac has been changed
145          */
146         if (sdata->wpan_dev.lowpan_dev)
147                 memcpy(sdata->wpan_dev.lowpan_dev->dev_addr, dev->dev_addr,
148                        dev->addr_len);
149 
150         return mac802154_wpan_update_llsec(dev);
151 }
152 
153 static int ieee802154_setup_hw(struct ieee802154_sub_if_data *sdata)
154 {
155         struct ieee802154_local *local = sdata->local;
156         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
157         int ret;
158 
159         if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
160                 ret = drv_set_promiscuous_mode(local,
161                                                wpan_dev->promiscuous_mode);
162                 if (ret < 0)
163                         return ret;
164         }
165 
166         if (local->hw.flags & IEEE802154_HW_AFILT) {
167                 ret = drv_set_pan_id(local, wpan_dev->pan_id);
168                 if (ret < 0)
169                         return ret;
170 
171                 ret = drv_set_extended_addr(local, wpan_dev->extended_addr);
172                 if (ret < 0)
173                         return ret;
174 
175                 ret = drv_set_short_addr(local, wpan_dev->short_addr);
176                 if (ret < 0)
177                         return ret;
178         }
179 
180         if (local->hw.flags & IEEE802154_HW_LBT) {
181                 ret = drv_set_lbt_mode(local, wpan_dev->lbt);
182                 if (ret < 0)
183                         return ret;
184         }
185 
186         if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
187                 ret = drv_set_csma_params(local, wpan_dev->min_be,
188                                           wpan_dev->max_be,
189                                           wpan_dev->csma_retries);
190                 if (ret < 0)
191                         return ret;
192         }
193 
194         if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
195                 ret = drv_set_max_frame_retries(local, wpan_dev->frame_retries);
196                 if (ret < 0)
197                         return ret;
198         }
199 
200         return 0;
201 }
202 
203 static int mac802154_slave_open(struct net_device *dev)
204 {
205         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
206         struct ieee802154_local *local = sdata->local;
207         int res;
208 
209         ASSERT_RTNL();
210 
211         set_bit(SDATA_STATE_RUNNING, &sdata->state);
212 
213         if (!local->open_count) {
214                 res = ieee802154_setup_hw(sdata);
215                 if (res)
216                         goto err;
217 
218                 res = drv_start(local);
219                 if (res)
220                         goto err;
221         }
222 
223         local->open_count++;
224         netif_start_queue(dev);
225         return 0;
226 err:
227         /* might already be clear but that doesn't matter */
228         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
229 
230         return res;
231 }
232 
233 static int
234 ieee802154_check_mac_settings(struct ieee802154_local *local,
235                               struct wpan_dev *wpan_dev,
236                               struct wpan_dev *nwpan_dev)
237 {
238         ASSERT_RTNL();
239 
240         if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
241                 if (wpan_dev->promiscuous_mode != nwpan_dev->promiscuous_mode)
242                         return -EBUSY;
243         }
244 
245         if (local->hw.flags & IEEE802154_HW_AFILT) {
246                 if (wpan_dev->pan_id != nwpan_dev->pan_id ||
247                     wpan_dev->short_addr != nwpan_dev->short_addr ||
248                     wpan_dev->extended_addr != nwpan_dev->extended_addr)
249                         return -EBUSY;
250         }
251 
252         if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
253                 if (wpan_dev->min_be != nwpan_dev->min_be ||
254                     wpan_dev->max_be != nwpan_dev->max_be ||
255                     wpan_dev->csma_retries != nwpan_dev->csma_retries)
256                         return -EBUSY;
257         }
258 
259         if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
260                 if (wpan_dev->frame_retries != nwpan_dev->frame_retries)
261                         return -EBUSY;
262         }
263 
264         if (local->hw.flags & IEEE802154_HW_LBT) {
265                 if (wpan_dev->lbt != nwpan_dev->lbt)
266                         return -EBUSY;
267         }
268 
269         return 0;
270 }
271 
272 static int
273 ieee802154_check_concurrent_iface(struct ieee802154_sub_if_data *sdata,
274                                   enum nl802154_iftype iftype)
275 {
276         struct ieee802154_local *local = sdata->local;
277         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
278         struct ieee802154_sub_if_data *nsdata;
279 
280         /* we hold the RTNL here so can safely walk the list */
281         list_for_each_entry(nsdata, &local->interfaces, list) {
282                 if (nsdata != sdata && ieee802154_sdata_running(nsdata)) {
283                         int ret;
284 
285                         /* TODO currently we don't support multiple node types
286                          * we need to run skb_clone at rx path. Check if there
287                          * exist really an use case if we need to support
288                          * multiple node types at the same time.
289                          */
290                         if (wpan_dev->iftype == NL802154_IFTYPE_NODE &&
291                             nsdata->wpan_dev.iftype == NL802154_IFTYPE_NODE)
292                                 return -EBUSY;
293 
294                         /* check all phy mac sublayer settings are the same.
295                          * We have only one phy, different values makes trouble.
296                          */
297                         ret = ieee802154_check_mac_settings(local, wpan_dev,
298                                                             &nsdata->wpan_dev);
299                         if (ret < 0)
300                                 return ret;
301                 }
302         }
303 
304         return 0;
305 }
306 
307 static int mac802154_wpan_open(struct net_device *dev)
308 {
309         int rc;
310         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
311         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
312 
313         rc = ieee802154_check_concurrent_iface(sdata, wpan_dev->iftype);
314         if (rc < 0)
315                 return rc;
316 
317         return mac802154_slave_open(dev);
318 }
319 
320 static int mac802154_slave_close(struct net_device *dev)
321 {
322         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
323         struct ieee802154_local *local = sdata->local;
324 
325         ASSERT_RTNL();
326 
327         netif_stop_queue(dev);
328         local->open_count--;
329 
330         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
331 
332         if (!local->open_count)
333                 ieee802154_stop_device(local);
334 
335         return 0;
336 }
337 
338 static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
339                                          struct ieee802154_hdr *hdr,
340                                          const struct ieee802154_mac_cb *cb)
341 {
342         struct ieee802154_llsec_params params;
343         u8 level;
344 
345         mac802154_llsec_get_params(&sdata->sec, &params);
346 
347         if (!params.enabled && cb->secen_override && cb->secen)
348                 return -EINVAL;
349         if (!params.enabled ||
350             (cb->secen_override && !cb->secen) ||
351             !params.out_level)
352                 return 0;
353         if (cb->seclevel_override && !cb->seclevel)
354                 return -EINVAL;
355 
356         level = cb->seclevel_override ? cb->seclevel : params.out_level;
357 
358         hdr->fc.security_enabled = 1;
359         hdr->sec.level = level;
360         hdr->sec.key_id_mode = params.out_key.mode;
361         if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
362                 hdr->sec.short_src = params.out_key.short_source;
363         else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
364                 hdr->sec.extended_src = params.out_key.extended_source;
365         hdr->sec.key_id = params.out_key.id;
366 
367         return 0;
368 }
369 
370 static int ieee802154_header_create(struct sk_buff *skb,
371                                     struct net_device *dev,
372                                     const struct ieee802154_addr *daddr,
373                                     const struct ieee802154_addr *saddr,
374                                     unsigned len)
375 {
376         struct ieee802154_hdr hdr;
377         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
378         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
379         struct ieee802154_mac_cb *cb = mac_cb(skb);
380         int hlen;
381 
382         if (!daddr)
383                 return -EINVAL;
384 
385         memset(&hdr.fc, 0, sizeof(hdr.fc));
386         hdr.fc.type = cb->type;
387         hdr.fc.security_enabled = cb->secen;
388         hdr.fc.ack_request = cb->ackreq;
389         hdr.seq = atomic_inc_return(&dev->ieee802154_ptr->dsn) & 0xFF;
390 
391         if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
392                 return -EINVAL;
393 
394         if (!saddr) {
395                 if (wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
396                     wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
397                     wpan_dev->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
398                         hdr.source.mode = IEEE802154_ADDR_LONG;
399                         hdr.source.extended_addr = wpan_dev->extended_addr;
400                 } else {
401                         hdr.source.mode = IEEE802154_ADDR_SHORT;
402                         hdr.source.short_addr = wpan_dev->short_addr;
403                 }
404 
405                 hdr.source.pan_id = wpan_dev->pan_id;
406         } else {
407                 hdr.source = *(const struct ieee802154_addr *)saddr;
408         }
409 
410         hdr.dest = *(const struct ieee802154_addr *)daddr;
411 
412         hlen = ieee802154_hdr_push(skb, &hdr);
413         if (hlen < 0)
414                 return -EINVAL;
415 
416         skb_reset_mac_header(skb);
417         skb->mac_len = hlen;
418 
419         if (len > ieee802154_max_payload(&hdr))
420                 return -EMSGSIZE;
421 
422         return hlen;
423 }
424 
425 static const struct wpan_dev_header_ops ieee802154_header_ops = {
426         .create         = ieee802154_header_create,
427 };
428 
429 /* This header create functionality assumes a 8 byte array for
430  * source and destination pointer at maximum. To adapt this for
431  * the 802.15.4 dataframe header we use extended address handling
432  * here only and intra pan connection. fc fields are mostly fallback
433  * handling. For provide dev_hard_header for dgram sockets.
434  */
435 static int mac802154_header_create(struct sk_buff *skb,
436                                    struct net_device *dev,
437                                    unsigned short type,
438                                    const void *daddr,
439                                    const void *saddr,
440                                    unsigned len)
441 {
442         struct ieee802154_hdr hdr;
443         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
444         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
445         struct ieee802154_mac_cb cb = { };
446         int hlen;
447 
448         if (!daddr)
449                 return -EINVAL;
450 
451         memset(&hdr.fc, 0, sizeof(hdr.fc));
452         hdr.fc.type = IEEE802154_FC_TYPE_DATA;
453         hdr.fc.ack_request = wpan_dev->ackreq;
454         hdr.seq = atomic_inc_return(&dev->ieee802154_ptr->dsn) & 0xFF;
455 
456         /* TODO currently a workaround to give zero cb block to set
457          * security parameters defaults according MIB.
458          */
459         if (mac802154_set_header_security(sdata, &hdr, &cb) < 0)
460                 return -EINVAL;
461 
462         hdr.dest.pan_id = wpan_dev->pan_id;
463         hdr.dest.mode = IEEE802154_ADDR_LONG;
464         ieee802154_be64_to_le64(&hdr.dest.extended_addr, daddr);
465 
466         hdr.source.pan_id = hdr.dest.pan_id;
467         hdr.source.mode = IEEE802154_ADDR_LONG;
468 
469         if (!saddr)
470                 hdr.source.extended_addr = wpan_dev->extended_addr;
471         else
472                 ieee802154_be64_to_le64(&hdr.source.extended_addr, saddr);
473 
474         hlen = ieee802154_hdr_push(skb, &hdr);
475         if (hlen < 0)
476                 return -EINVAL;
477 
478         skb_reset_mac_header(skb);
479         skb->mac_len = hlen;
480 
481         if (len > ieee802154_max_payload(&hdr))
482                 return -EMSGSIZE;
483 
484         return hlen;
485 }
486 
487 static int
488 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
489 {
490         struct ieee802154_hdr hdr;
491 
492         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
493                 pr_debug("malformed packet\n");
494                 return 0;
495         }
496 
497         if (hdr.source.mode == IEEE802154_ADDR_LONG) {
498                 ieee802154_le64_to_be64(haddr, &hdr.source.extended_addr);
499                 return IEEE802154_EXTENDED_ADDR_LEN;
500         }
501 
502         return 0;
503 }
504 
505 static const struct header_ops mac802154_header_ops = {
506         .create         = mac802154_header_create,
507         .parse          = mac802154_header_parse,
508 };
509 
510 static const struct net_device_ops mac802154_wpan_ops = {
511         .ndo_open               = mac802154_wpan_open,
512         .ndo_stop               = mac802154_slave_close,
513         .ndo_start_xmit         = ieee802154_subif_start_xmit,
514         .ndo_do_ioctl           = mac802154_wpan_ioctl,
515         .ndo_set_mac_address    = mac802154_wpan_mac_addr,
516 };
517 
518 static const struct net_device_ops mac802154_monitor_ops = {
519         .ndo_open               = mac802154_wpan_open,
520         .ndo_stop               = mac802154_slave_close,
521         .ndo_start_xmit         = ieee802154_monitor_start_xmit,
522 };
523 
524 static void mac802154_wpan_free(struct net_device *dev)
525 {
526         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
527 
528         mac802154_llsec_destroy(&sdata->sec);
529 }
530 
531 static void ieee802154_if_setup(struct net_device *dev)
532 {
533         dev->addr_len           = IEEE802154_EXTENDED_ADDR_LEN;
534         memset(dev->broadcast, 0xff, IEEE802154_EXTENDED_ADDR_LEN);
535 
536         /* Let hard_header_len set to IEEE802154_MIN_HEADER_LEN. AF_PACKET
537          * will not send frames without any payload, but ack frames
538          * has no payload, so substract one that we can send a 3 bytes
539          * frame. The xmit callback assumes at least a hard header where two
540          * bytes fc and sequence field are set.
541          */
542         dev->hard_header_len    = IEEE802154_MIN_HEADER_LEN - 1;
543         /* The auth_tag header is for security and places in private payload
544          * room of mac frame which stucks between payload and FCS field.
545          */
546         dev->needed_tailroom    = IEEE802154_MAX_AUTH_TAG_LEN +
547                                   IEEE802154_FCS_LEN;
548         /* The mtu size is the payload without mac header in this case.
549          * We have a dynamic length header with a minimum header length
550          * which is hard_header_len. In this case we let mtu to the size
551          * of maximum payload which is IEEE802154_MTU - IEEE802154_FCS_LEN -
552          * hard_header_len. The FCS which is set by hardware or ndo_start_xmit
553          * and the minimum mac header which can be evaluated inside driver
554          * layer. The rest of mac header will be part of payload if greater
555          * than hard_header_len.
556          */
557         dev->mtu                = IEEE802154_MTU - IEEE802154_FCS_LEN -
558                                   dev->hard_header_len;
559         dev->tx_queue_len       = 300;
560         dev->flags              = IFF_NOARP | IFF_BROADCAST;
561 }
562 
563 static int
564 ieee802154_setup_sdata(struct ieee802154_sub_if_data *sdata,
565                        enum nl802154_iftype type)
566 {
567         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
568         int ret;
569         u8 tmp;
570 
571         /* set some type-dependent values */
572         sdata->wpan_dev.iftype = type;
573 
574         get_random_bytes(&tmp, sizeof(tmp));
575         atomic_set(&wpan_dev->bsn, tmp);
576         get_random_bytes(&tmp, sizeof(tmp));
577         atomic_set(&wpan_dev->dsn, tmp);
578 
579         /* defaults per 802.15.4-2011 */
580         wpan_dev->min_be = 3;
581         wpan_dev->max_be = 5;
582         wpan_dev->csma_retries = 4;
583         wpan_dev->frame_retries = 3;
584 
585         wpan_dev->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
586         wpan_dev->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
587 
588         switch (type) {
589         case NL802154_IFTYPE_NODE:
590                 ieee802154_be64_to_le64(&wpan_dev->extended_addr,
591                                         sdata->dev->dev_addr);
592 
593                 sdata->dev->header_ops = &mac802154_header_ops;
594                 sdata->dev->needs_free_netdev = true;
595                 sdata->dev->priv_destructor = mac802154_wpan_free;
596                 sdata->dev->netdev_ops = &mac802154_wpan_ops;
597                 sdata->dev->ml_priv = &mac802154_mlme_wpan;
598                 wpan_dev->promiscuous_mode = false;
599                 wpan_dev->header_ops = &ieee802154_header_ops;
600 
601                 mutex_init(&sdata->sec_mtx);
602 
603                 mac802154_llsec_init(&sdata->sec);
604                 ret = mac802154_wpan_update_llsec(sdata->dev);
605                 if (ret < 0)
606                         return ret;
607 
608                 break;
609         case NL802154_IFTYPE_MONITOR:
610                 sdata->dev->needs_free_netdev = true;
611                 sdata->dev->netdev_ops = &mac802154_monitor_ops;
612                 wpan_dev->promiscuous_mode = true;
613                 break;
614         default:
615                 BUG();
616         }
617 
618         return 0;
619 }
620 
621 struct net_device *
622 ieee802154_if_add(struct ieee802154_local *local, const char *name,
623                   unsigned char name_assign_type, enum nl802154_iftype type,
624                   __le64 extended_addr)
625 {
626         struct net_device *ndev = NULL;
627         struct ieee802154_sub_if_data *sdata = NULL;
628         int ret = -ENOMEM;
629 
630         ASSERT_RTNL();
631 
632         ndev = alloc_netdev(sizeof(*sdata), name,
633                             name_assign_type, ieee802154_if_setup);
634         if (!ndev)
635                 return ERR_PTR(-ENOMEM);
636 
637         ndev->needed_headroom = local->hw.extra_tx_headroom +
638                                 IEEE802154_MAX_HEADER_LEN;
639 
640         ret = dev_alloc_name(ndev, ndev->name);
641         if (ret < 0)
642                 goto err;
643 
644         ieee802154_le64_to_be64(ndev->perm_addr,
645                                 &local->hw.phy->perm_extended_addr);
646         switch (type) {
647         case NL802154_IFTYPE_NODE:
648                 ndev->type = ARPHRD_IEEE802154;
649                 if (ieee802154_is_valid_extended_unicast_addr(extended_addr))
650                         ieee802154_le64_to_be64(ndev->dev_addr, &extended_addr);
651                 else
652                         memcpy(ndev->dev_addr, ndev->perm_addr,
653                                IEEE802154_EXTENDED_ADDR_LEN);
654                 break;
655         case NL802154_IFTYPE_MONITOR:
656                 ndev->type = ARPHRD_IEEE802154_MONITOR;
657                 break;
658         default:
659                 ret = -EINVAL;
660                 goto err;
661         }
662 
663         /* TODO check this */
664         SET_NETDEV_DEV(ndev, &local->phy->dev);
665         dev_net_set(ndev, wpan_phy_net(local->hw.phy));
666         sdata = netdev_priv(ndev);
667         ndev->ieee802154_ptr = &sdata->wpan_dev;
668         memcpy(sdata->name, ndev->name, IFNAMSIZ);
669         sdata->dev = ndev;
670         sdata->wpan_dev.wpan_phy = local->hw.phy;
671         sdata->local = local;
672 
673         /* setup type-dependent data */
674         ret = ieee802154_setup_sdata(sdata, type);
675         if (ret)
676                 goto err;
677 
678         ret = register_netdevice(ndev);
679         if (ret < 0)
680                 goto err;
681 
682         mutex_lock(&local->iflist_mtx);
683         list_add_tail_rcu(&sdata->list, &local->interfaces);
684         mutex_unlock(&local->iflist_mtx);
685 
686         return ndev;
687 
688 err:
689         free_netdev(ndev);
690         return ERR_PTR(ret);
691 }
692 
693 void ieee802154_if_remove(struct ieee802154_sub_if_data *sdata)
694 {
695         ASSERT_RTNL();
696 
697         mutex_lock(&sdata->local->iflist_mtx);
698         list_del_rcu(&sdata->list);
699         mutex_unlock(&sdata->local->iflist_mtx);
700 
701         synchronize_rcu();
702         unregister_netdevice(sdata->dev);
703 }
704 
705 void ieee802154_remove_interfaces(struct ieee802154_local *local)
706 {
707         struct ieee802154_sub_if_data *sdata, *tmp;
708 
709         mutex_lock(&local->iflist_mtx);
710         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
711                 list_del(&sdata->list);
712 
713                 unregister_netdevice(sdata->dev);
714         }
715         mutex_unlock(&local->iflist_mtx);
716 }
717 
718 static int netdev_notify(struct notifier_block *nb,
719                          unsigned long state, void *ptr)
720 {
721         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
722         struct ieee802154_sub_if_data *sdata;
723 
724         if (state != NETDEV_CHANGENAME)
725                 return NOTIFY_DONE;
726 
727         if (!dev->ieee802154_ptr || !dev->ieee802154_ptr->wpan_phy)
728                 return NOTIFY_DONE;
729 
730         if (dev->ieee802154_ptr->wpan_phy->privid != mac802154_wpan_phy_privid)
731                 return NOTIFY_DONE;
732 
733         sdata = IEEE802154_DEV_TO_SUB_IF(dev);
734         memcpy(sdata->name, dev->name, IFNAMSIZ);
735 
736         return NOTIFY_OK;
737 }
738 
739 static struct notifier_block mac802154_netdev_notifier = {
740         .notifier_call = netdev_notify,
741 };
742 
743 int ieee802154_iface_init(void)
744 {
745         return register_netdevice_notifier(&mac802154_netdev_notifier);
746 }
747 
748 void ieee802154_iface_exit(void)
749 {
750         unregister_netdevice_notifier(&mac802154_netdev_notifier);
751 }
752 

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