iface.c 46 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991001011021031041051061071081091101111121131141151161171181191201211221231241251261271281291301311321331341351361371381391401411421431441451461471481491501511521531541551561571581591601611621631641651661671681691701711721731741751761771781791801811821831841851861871881891901911921931941951961971981992002012022032042052062072082092102112122132142152162172182192202212222232242252262272282292302312322332342352362372382392402412422432442452462472482492502512522532542552562572582592602612622632642652662672682692702712722732742752762772782792802812822832842852862872882892902912922932942952962972982993003013023033043053063073083093103113123133143153163173183193203213223233243253263273283293303313323333343353363373383393403413423433443453463473483493503513523533543553563573583593603613623633643653663673683693703713723733743753763773783793803813823833843853863873883893903913923933943953963973983994004014024034044054064074084094104114124134144154164174184194204214224234244254264274284294304314324334344354364374384394404414424434444454464474484494504514524534544554564574584594604614624634644654664674684694704714724734744754764774784794804814824834844854864874884894904914924934944954964974984995005015025035045055065075085095105115125135145155165175185195205215225235245255265275285295305315325335345355365375385395405415425435445455465475485495505515525535545555565575585595605615625635645655665675685695705715725735745755765775785795805815825835845855865875885895905915925935945955965975985996006016026036046056066076086096106116126136146156166176186196206216226236246256266276286296306316326336346356366376386396406416426436446456466476486496506516526536546556566576586596606616626636646656666676686696706716726736746756766776786796806816826836846856866876886896906916926936946956966976986997007017027037047057067077087097107117127137147157167177187197207217227237247257267277287297307317327337347357367377387397407417427437447457467477487497507517527537547557567577587597607617627637647657667677687697707717727737747757767777787797807817827837847857867877887897907917927937947957967977987998008018028038048058068078088098108118128138148158168178188198208218228238248258268278288298308318328338348358368378388398408418428438448458468478488498508518528538548558568578588598608618628638648658668678688698708718728738748758768778788798808818828838848858868878888898908918928938948958968978988999009019029039049059069079089099109119129139149159169179189199209219229239249259269279289299309319329339349359369379389399409419429439449459469479489499509519529539549559569579589599609619629639649659669679689699709719729739749759769779789799809819829839849859869879889899909919929939949959969979989991000100110021003100410051006100710081009101010111012101310141015101610171018101910201021102210231024102510261027102810291030103110321033103410351036103710381039104010411042104310441045104610471048104910501051105210531054105510561057105810591060106110621063106410651066106710681069107010711072107310741075107610771078107910801081108210831084108510861087108810891090109110921093109410951096109710981099110011011102110311041105110611071108110911101111111211131114111511161117111811191120112111221123112411251126112711281129113011311132113311341135113611371138113911401141114211431144114511461147114811491150115111521153115411551156115711581159116011611162116311641165116611671168116911701171117211731174117511761177117811791180118111821183118411851186118711881189119011911192119311941195119611971198119912001201120212031204120512061207120812091210121112121213121412151216121712181219122012211222122312241225122612271228122912301231123212331234123512361237123812391240124112421243124412451246124712481249125012511252125312541255125612571258125912601261126212631264126512661267126812691270127112721273127412751276127712781279128012811282128312841285128612871288128912901291129212931294129512961297129812991300130113021303130413051306130713081309131013111312131313141315131613171318131913201321132213231324132513261327132813291330133113321333133413351336133713381339134013411342134313441345134613471348134913501351135213531354135513561357135813591360136113621363136413651366136713681369137013711372137313741375137613771378137913801381138213831384138513861387138813891390139113921393139413951396139713981399140014011402140314041405140614071408140914101411141214131414141514161417141814191420142114221423142414251426142714281429143014311432143314341435143614371438143914401441144214431444144514461447144814491450145114521453145414551456145714581459146014611462146314641465146614671468146914701471147214731474147514761477147814791480148114821483148414851486148714881489149014911492149314941495149614971498149915001501150215031504150515061507150815091510151115121513151415151516151715181519152015211522152315241525152615271528152915301531153215331534153515361537153815391540154115421543154415451546154715481549155015511552155315541555155615571558155915601561156215631564156515661567156815691570157115721573157415751576157715781579158015811582158315841585158615871588158915901591159215931594159515961597159815991600160116021603160416051606160716081609161016111612161316141615161616171618161916201621162216231624162516261627162816291630163116321633163416351636163716381639164016411642164316441645164616471648164916501651165216531654165516561657165816591660166116621663166416651666166716681669167016711672167316741675167616771678167916801681168216831684168516861687168816891690169116921693169416951696169716981699170017011702170317041705170617071708170917101711171217131714171517161717171817191720172117221723172417251726172717281729173017311732173317341735173617371738173917401741174217431744174517461747174817491750175117521753175417551756175717581759176017611762176317641765176617671768176917701771177217731774177517761777177817791780178117821783178417851786178717881789179017911792179317941795179617971798179918001801
  1. /*
  2. * Interface handling
  3. *
  4. * Copyright 2002-2005, Instant802 Networks, Inc.
  5. * Copyright 2005-2006, Devicescape Software, Inc.
  6. * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
  7. * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
  8. *
  9. * This program is free software; you can redistribute it and/or modify
  10. * it under the terms of the GNU General Public License version 2 as
  11. * published by the Free Software Foundation.
  12. */
  13. #include <linux/slab.h>
  14. #include <linux/kernel.h>
  15. #include <linux/if_arp.h>
  16. #include <linux/netdevice.h>
  17. #include <linux/rtnetlink.h>
  18. #include <net/mac80211.h>
  19. #include <net/ieee80211_radiotap.h>
  20. #include "ieee80211_i.h"
  21. #include "sta_info.h"
  22. #include "debugfs_netdev.h"
  23. #include "mesh.h"
  24. #include "led.h"
  25. #include "driver-ops.h"
  26. #include "wme.h"
  27. #include "rate.h"
  28. /**
  29. * DOC: Interface list locking
  30. *
  31. * The interface list in each struct ieee80211_local is protected
  32. * three-fold:
  33. *
  34. * (1) modifications may only be done under the RTNL
  35. * (2) modifications and readers are protected against each other by
  36. * the iflist_mtx.
  37. * (3) modifications are done in an RCU manner so atomic readers
  38. * can traverse the list in RCU-safe blocks.
  39. *
  40. * As a consequence, reads (traversals) of the list can be protected
  41. * by either the RTNL, the iflist_mtx or RCU.
  42. */
  43. bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  44. {
  45. struct ieee80211_chanctx_conf *chanctx_conf;
  46. int power;
  47. rcu_read_lock();
  48. chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  49. if (!chanctx_conf) {
  50. rcu_read_unlock();
  51. return false;
  52. }
  53. power = chanctx_conf->def.chan->max_power;
  54. rcu_read_unlock();
  55. if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  56. power = min(power, sdata->user_power_level);
  57. if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  58. power = min(power, sdata->ap_power_level);
  59. if (power != sdata->vif.bss_conf.txpower) {
  60. sdata->vif.bss_conf.txpower = power;
  61. ieee80211_hw_config(sdata->local, 0);
  62. return true;
  63. }
  64. return false;
  65. }
  66. void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  67. {
  68. if (__ieee80211_recalc_txpower(sdata))
  69. ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  70. }
  71. static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  72. {
  73. if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  74. return 0;
  75. local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  76. return IEEE80211_CONF_CHANGE_IDLE;
  77. }
  78. static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  79. {
  80. if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  81. return 0;
  82. ieee80211_flush_queues(local, NULL);
  83. local->hw.conf.flags |= IEEE80211_CONF_IDLE;
  84. return IEEE80211_CONF_CHANGE_IDLE;
  85. }
  86. static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
  87. bool force_active)
  88. {
  89. bool working = false, scanning, active;
  90. unsigned int led_trig_start = 0, led_trig_stop = 0;
  91. struct ieee80211_roc_work *roc;
  92. lockdep_assert_held(&local->mtx);
  93. active = force_active ||
  94. !list_empty(&local->chanctx_list) ||
  95. local->monitors;
  96. if (!local->ops->remain_on_channel) {
  97. list_for_each_entry(roc, &local->roc_list, list) {
  98. working = true;
  99. break;
  100. }
  101. }
  102. scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
  103. test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
  104. if (working || scanning)
  105. led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
  106. else
  107. led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
  108. if (active)
  109. led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
  110. else
  111. led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
  112. ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
  113. if (working || scanning || active)
  114. return __ieee80211_idle_off(local);
  115. return __ieee80211_idle_on(local);
  116. }
  117. u32 ieee80211_idle_off(struct ieee80211_local *local)
  118. {
  119. return __ieee80211_recalc_idle(local, true);
  120. }
  121. void ieee80211_recalc_idle(struct ieee80211_local *local)
  122. {
  123. u32 change = __ieee80211_recalc_idle(local, false);
  124. if (change)
  125. ieee80211_hw_config(local, change);
  126. }
  127. static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  128. {
  129. if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
  130. return -EINVAL;
  131. dev->mtu = new_mtu;
  132. return 0;
  133. }
  134. static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
  135. bool check_dup)
  136. {
  137. struct ieee80211_local *local = sdata->local;
  138. struct ieee80211_sub_if_data *iter;
  139. u64 new, mask, tmp;
  140. u8 *m;
  141. int ret = 0;
  142. if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
  143. return 0;
  144. m = addr;
  145. new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
  146. ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
  147. ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
  148. m = local->hw.wiphy->addr_mask;
  149. mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
  150. ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
  151. ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
  152. if (!check_dup)
  153. return ret;
  154. mutex_lock(&local->iflist_mtx);
  155. list_for_each_entry(iter, &local->interfaces, list) {
  156. if (iter == sdata)
  157. continue;
  158. if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
  159. !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
  160. continue;
  161. m = iter->vif.addr;
  162. tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
  163. ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
  164. ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
  165. if ((new & ~mask) != (tmp & ~mask)) {
  166. ret = -EINVAL;
  167. break;
  168. }
  169. }
  170. mutex_unlock(&local->iflist_mtx);
  171. return ret;
  172. }
  173. static int ieee80211_change_mac(struct net_device *dev, void *addr)
  174. {
  175. struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  176. struct sockaddr *sa = addr;
  177. bool check_dup = true;
  178. int ret;
  179. if (ieee80211_sdata_running(sdata))
  180. return -EBUSY;
  181. if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
  182. !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
  183. check_dup = false;
  184. ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
  185. if (ret)
  186. return ret;
  187. ret = eth_mac_addr(dev, sa);
  188. if (ret == 0)
  189. memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
  190. return ret;
  191. }
  192. static inline int identical_mac_addr_allowed(int type1, int type2)
  193. {
  194. return type1 == NL80211_IFTYPE_MONITOR ||
  195. type2 == NL80211_IFTYPE_MONITOR ||
  196. type1 == NL80211_IFTYPE_P2P_DEVICE ||
  197. type2 == NL80211_IFTYPE_P2P_DEVICE ||
  198. (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  199. (type1 == NL80211_IFTYPE_WDS &&
  200. (type2 == NL80211_IFTYPE_WDS ||
  201. type2 == NL80211_IFTYPE_AP)) ||
  202. (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  203. (type1 == NL80211_IFTYPE_AP_VLAN &&
  204. (type2 == NL80211_IFTYPE_AP ||
  205. type2 == NL80211_IFTYPE_AP_VLAN));
  206. }
  207. static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
  208. enum nl80211_iftype iftype)
  209. {
  210. struct ieee80211_local *local = sdata->local;
  211. struct ieee80211_sub_if_data *nsdata;
  212. ASSERT_RTNL();
  213. /* we hold the RTNL here so can safely walk the list */
  214. list_for_each_entry(nsdata, &local->interfaces, list) {
  215. if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
  216. /*
  217. * Allow only a single IBSS interface to be up at any
  218. * time. This is restricted because beacon distribution
  219. * cannot work properly if both are in the same IBSS.
  220. *
  221. * To remove this restriction we'd have to disallow them
  222. * from setting the same SSID on different IBSS interfaces
  223. * belonging to the same hardware. Then, however, we're
  224. * faced with having to adopt two different TSF timers...
  225. */
  226. if (iftype == NL80211_IFTYPE_ADHOC &&
  227. nsdata->vif.type == NL80211_IFTYPE_ADHOC)
  228. return -EBUSY;
  229. /*
  230. * The remaining checks are only performed for interfaces
  231. * with the same MAC address.
  232. */
  233. if (!ether_addr_equal(sdata->vif.addr,
  234. nsdata->vif.addr))
  235. continue;
  236. /*
  237. * check whether it may have the same address
  238. */
  239. if (!identical_mac_addr_allowed(iftype,
  240. nsdata->vif.type))
  241. return -ENOTUNIQ;
  242. /*
  243. * can only add VLANs to enabled APs
  244. */
  245. if (iftype == NL80211_IFTYPE_AP_VLAN &&
  246. nsdata->vif.type == NL80211_IFTYPE_AP)
  247. sdata->bss = &nsdata->u.ap;
  248. }
  249. }
  250. return 0;
  251. }
  252. static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
  253. {
  254. int n_queues = sdata->local->hw.queues;
  255. int i;
  256. if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
  257. for (i = 0; i < IEEE80211_NUM_ACS; i++) {
  258. if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
  259. IEEE80211_INVAL_HW_QUEUE))
  260. return -EINVAL;
  261. if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
  262. n_queues))
  263. return -EINVAL;
  264. }
  265. }
  266. if ((sdata->vif.type != NL80211_IFTYPE_AP &&
  267. sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
  268. !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
  269. sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
  270. return 0;
  271. }
  272. if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
  273. return -EINVAL;
  274. if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
  275. return -EINVAL;
  276. return 0;
  277. }
  278. void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
  279. const int offset)
  280. {
  281. struct ieee80211_local *local = sdata->local;
  282. u32 flags = sdata->u.mntr_flags;
  283. #define ADJUST(_f, _s) do { \
  284. if (flags & MONITOR_FLAG_##_f) \
  285. local->fif_##_s += offset; \
  286. } while (0)
  287. ADJUST(FCSFAIL, fcsfail);
  288. ADJUST(PLCPFAIL, plcpfail);
  289. ADJUST(CONTROL, control);
  290. ADJUST(CONTROL, pspoll);
  291. ADJUST(OTHER_BSS, other_bss);
  292. #undef ADJUST
  293. }
  294. static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
  295. {
  296. struct ieee80211_local *local = sdata->local;
  297. int i;
  298. for (i = 0; i < IEEE80211_NUM_ACS; i++) {
  299. if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
  300. sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
  301. else if (local->hw.queues >= IEEE80211_NUM_ACS)
  302. sdata->vif.hw_queue[i] = i;
  303. else
  304. sdata->vif.hw_queue[i] = 0;
  305. }
  306. sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
  307. }
  308. int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
  309. {
  310. struct ieee80211_sub_if_data *sdata;
  311. int ret;
  312. if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
  313. return 0;
  314. ASSERT_RTNL();
  315. if (local->monitor_sdata)
  316. return 0;
  317. sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
  318. if (!sdata)
  319. return -ENOMEM;
  320. /* set up data */
  321. sdata->local = local;
  322. sdata->vif.type = NL80211_IFTYPE_MONITOR;
  323. snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
  324. wiphy_name(local->hw.wiphy));
  325. ieee80211_set_default_queues(sdata);
  326. ret = drv_add_interface(local, sdata);
  327. if (WARN_ON(ret)) {
  328. /* ok .. stupid driver, it asked for this! */
  329. kfree(sdata);
  330. return ret;
  331. }
  332. ret = ieee80211_check_queues(sdata);
  333. if (ret) {
  334. kfree(sdata);
  335. return ret;
  336. }
  337. ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
  338. IEEE80211_CHANCTX_EXCLUSIVE);
  339. if (ret) {
  340. drv_remove_interface(local, sdata);
  341. kfree(sdata);
  342. return ret;
  343. }
  344. mutex_lock(&local->iflist_mtx);
  345. rcu_assign_pointer(local->monitor_sdata, sdata);
  346. mutex_unlock(&local->iflist_mtx);
  347. return 0;
  348. }
  349. void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
  350. {
  351. struct ieee80211_sub_if_data *sdata;
  352. if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
  353. return;
  354. ASSERT_RTNL();
  355. mutex_lock(&local->iflist_mtx);
  356. sdata = rcu_dereference_protected(local->monitor_sdata,
  357. lockdep_is_held(&local->iflist_mtx));
  358. if (!sdata) {
  359. mutex_unlock(&local->iflist_mtx);
  360. return;
  361. }
  362. rcu_assign_pointer(local->monitor_sdata, NULL);
  363. mutex_unlock(&local->iflist_mtx);
  364. synchronize_net();
  365. ieee80211_vif_release_channel(sdata);
  366. drv_remove_interface(local, sdata);
  367. kfree(sdata);
  368. }
  369. /*
  370. * NOTE: Be very careful when changing this function, it must NOT return
  371. * an error on interface type changes that have been pre-checked, so most
  372. * checks should be in ieee80211_check_concurrent_iface.
  373. */
  374. int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
  375. {
  376. struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
  377. struct net_device *dev = wdev->netdev;
  378. struct ieee80211_local *local = sdata->local;
  379. struct sta_info *sta;
  380. u32 changed = 0;
  381. int res;
  382. u32 hw_reconf_flags = 0;
  383. switch (sdata->vif.type) {
  384. case NL80211_IFTYPE_WDS:
  385. if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
  386. return -ENOLINK;
  387. break;
  388. case NL80211_IFTYPE_AP_VLAN: {
  389. struct ieee80211_sub_if_data *master;
  390. if (!sdata->bss)
  391. return -ENOLINK;
  392. list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
  393. master = container_of(sdata->bss,
  394. struct ieee80211_sub_if_data, u.ap);
  395. sdata->control_port_protocol =
  396. master->control_port_protocol;
  397. sdata->control_port_no_encrypt =
  398. master->control_port_no_encrypt;
  399. sdata->vif.cab_queue = master->vif.cab_queue;
  400. memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
  401. sizeof(sdata->vif.hw_queue));
  402. break;
  403. }
  404. case NL80211_IFTYPE_AP:
  405. sdata->bss = &sdata->u.ap;
  406. break;
  407. case NL80211_IFTYPE_MESH_POINT:
  408. case NL80211_IFTYPE_STATION:
  409. case NL80211_IFTYPE_MONITOR:
  410. case NL80211_IFTYPE_ADHOC:
  411. case NL80211_IFTYPE_P2P_DEVICE:
  412. /* no special treatment */
  413. break;
  414. case NL80211_IFTYPE_UNSPECIFIED:
  415. case NUM_NL80211_IFTYPES:
  416. case NL80211_IFTYPE_P2P_CLIENT:
  417. case NL80211_IFTYPE_P2P_GO:
  418. /* cannot happen */
  419. WARN_ON(1);
  420. break;
  421. }
  422. if (local->open_count == 0) {
  423. res = drv_start(local);
  424. if (res)
  425. goto err_del_bss;
  426. /* we're brought up, everything changes */
  427. hw_reconf_flags = ~0;
  428. ieee80211_led_radio(local, true);
  429. ieee80211_mod_tpt_led_trig(local,
  430. IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
  431. }
  432. /*
  433. * Copy the hopefully now-present MAC address to
  434. * this interface, if it has the special null one.
  435. */
  436. if (dev && is_zero_ether_addr(dev->dev_addr)) {
  437. memcpy(dev->dev_addr,
  438. local->hw.wiphy->perm_addr,
  439. ETH_ALEN);
  440. memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
  441. if (!is_valid_ether_addr(dev->dev_addr)) {
  442. res = -EADDRNOTAVAIL;
  443. goto err_stop;
  444. }
  445. }
  446. switch (sdata->vif.type) {
  447. case NL80211_IFTYPE_AP_VLAN:
  448. /* no need to tell driver, but set carrier and chanctx */
  449. if (rtnl_dereference(sdata->bss->beacon)) {
  450. ieee80211_vif_vlan_copy_chanctx(sdata);
  451. netif_carrier_on(dev);
  452. } else {
  453. netif_carrier_off(dev);
  454. }
  455. break;
  456. case NL80211_IFTYPE_MONITOR:
  457. if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
  458. local->cooked_mntrs++;
  459. break;
  460. }
  461. if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
  462. res = drv_add_interface(local, sdata);
  463. if (res)
  464. goto err_stop;
  465. } else if (local->monitors == 0 && local->open_count == 0) {
  466. res = ieee80211_add_virtual_monitor(local);
  467. if (res)
  468. goto err_stop;
  469. }
  470. /* must be before the call to ieee80211_configure_filter */
  471. local->monitors++;
  472. if (local->monitors == 1) {
  473. local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
  474. hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
  475. }
  476. ieee80211_adjust_monitor_flags(sdata, 1);
  477. ieee80211_configure_filter(local);
  478. mutex_lock(&local->mtx);
  479. ieee80211_recalc_idle(local);
  480. mutex_unlock(&local->mtx);
  481. netif_carrier_on(dev);
  482. break;
  483. default:
  484. if (coming_up) {
  485. ieee80211_del_virtual_monitor(local);
  486. res = drv_add_interface(local, sdata);
  487. if (res)
  488. goto err_stop;
  489. res = ieee80211_check_queues(sdata);
  490. if (res)
  491. goto err_del_interface;
  492. }
  493. if (sdata->vif.type == NL80211_IFTYPE_AP) {
  494. local->fif_pspoll++;
  495. local->fif_probe_req++;
  496. ieee80211_configure_filter(local);
  497. } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
  498. local->fif_probe_req++;
  499. }
  500. if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
  501. changed |= ieee80211_reset_erp_info(sdata);
  502. ieee80211_bss_info_change_notify(sdata, changed);
  503. switch (sdata->vif.type) {
  504. case NL80211_IFTYPE_STATION:
  505. case NL80211_IFTYPE_ADHOC:
  506. case NL80211_IFTYPE_AP:
  507. case NL80211_IFTYPE_MESH_POINT:
  508. netif_carrier_off(dev);
  509. break;
  510. case NL80211_IFTYPE_WDS:
  511. case NL80211_IFTYPE_P2P_DEVICE:
  512. break;
  513. default:
  514. /* not reached */
  515. WARN_ON(1);
  516. }
  517. /*
  518. * set default queue parameters so drivers don't
  519. * need to initialise the hardware if the hardware
  520. * doesn't start up with sane defaults
  521. */
  522. ieee80211_set_wmm_default(sdata, true);
  523. }
  524. set_bit(SDATA_STATE_RUNNING, &sdata->state);
  525. if (sdata->vif.type == NL80211_IFTYPE_WDS) {
  526. /* Create STA entry for the WDS peer */
  527. sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
  528. GFP_KERNEL);
  529. if (!sta) {
  530. res = -ENOMEM;
  531. goto err_del_interface;
  532. }
  533. sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
  534. sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
  535. sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
  536. res = sta_info_insert(sta);
  537. if (res) {
  538. /* STA has been freed */
  539. goto err_del_interface;
  540. }
  541. rate_control_rate_init(sta);
  542. netif_carrier_on(dev);
  543. } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
  544. rcu_assign_pointer(local->p2p_sdata, sdata);
  545. }
  546. /*
  547. * set_multicast_list will be invoked by the networking core
  548. * which will check whether any increments here were done in
  549. * error and sync them down to the hardware as filter flags.
  550. */
  551. if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
  552. atomic_inc(&local->iff_allmultis);
  553. if (sdata->flags & IEEE80211_SDATA_PROMISC)
  554. atomic_inc(&local->iff_promiscs);
  555. if (coming_up)
  556. local->open_count++;
  557. if (hw_reconf_flags)
  558. ieee80211_hw_config(local, hw_reconf_flags);
  559. ieee80211_recalc_ps(local, -1);
  560. if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
  561. sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
  562. /* XXX: for AP_VLAN, actually track AP queues */
  563. netif_tx_start_all_queues(dev);
  564. } else if (dev) {
  565. unsigned long flags;
  566. int n_acs = IEEE80211_NUM_ACS;
  567. int ac;
  568. if (local->hw.queues < IEEE80211_NUM_ACS)
  569. n_acs = 1;
  570. spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
  571. if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
  572. (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
  573. skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
  574. for (ac = 0; ac < n_acs; ac++) {
  575. int ac_queue = sdata->vif.hw_queue[ac];
  576. if (local->queue_stop_reasons[ac_queue] == 0 &&
  577. skb_queue_empty(&local->pending[ac_queue]))
  578. netif_start_subqueue(dev, ac);
  579. }
  580. }
  581. spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
  582. }
  583. return 0;
  584. err_del_interface:
  585. drv_remove_interface(local, sdata);
  586. err_stop:
  587. if (!local->open_count)
  588. drv_stop(local);
  589. err_del_bss:
  590. sdata->bss = NULL;
  591. if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
  592. list_del(&sdata->u.vlan.list);
  593. /* might already be clear but that doesn't matter */
  594. clear_bit(SDATA_STATE_RUNNING, &sdata->state);
  595. return res;
  596. }
  597. static int ieee80211_open(struct net_device *dev)
  598. {
  599. struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  600. int err;
  601. /* fail early if user set an invalid address */
  602. if (!is_valid_ether_addr(dev->dev_addr))
  603. return -EADDRNOTAVAIL;
  604. err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
  605. if (err)
  606. return err;
  607. return ieee80211_do_open(&sdata->wdev, true);
  608. }
  609. static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
  610. bool going_down)
  611. {
  612. struct ieee80211_local *local = sdata->local;
  613. unsigned long flags;
  614. struct sk_buff *skb, *tmp;
  615. u32 hw_reconf_flags = 0;
  616. int i, flushed;
  617. struct ps_data *ps;
  618. clear_bit(SDATA_STATE_RUNNING, &sdata->state);
  619. if (rcu_access_pointer(local->scan_sdata) == sdata)
  620. ieee80211_scan_cancel(local);
  621. /*
  622. * Stop TX on this interface first.
  623. */
  624. if (sdata->dev)
  625. netif_tx_stop_all_queues(sdata->dev);
  626. ieee80211_roc_purge(local, sdata);
  627. if (sdata->vif.type == NL80211_IFTYPE_STATION)
  628. ieee80211_mgd_stop(sdata);
  629. /*
  630. * Remove all stations associated with this interface.
  631. *
  632. * This must be done before calling ops->remove_interface()
  633. * because otherwise we can later invoke ops->sta_notify()
  634. * whenever the STAs are removed, and that invalidates driver
  635. * assumptions about always getting a vif pointer that is valid
  636. * (because if we remove a STA after ops->remove_interface()
  637. * the driver will have removed the vif info already!)
  638. *
  639. * This is relevant only in WDS mode, in all other modes we've
  640. * already removed all stations when disconnecting or similar,
  641. * so warn otherwise.
  642. *
  643. * We call sta_info_flush_cleanup() later, to combine RCU waits.
  644. */
  645. flushed = sta_info_flush_defer(sdata);
  646. WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
  647. (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
  648. /* don't count this interface for promisc/allmulti while it is down */
  649. if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
  650. atomic_dec(&local->iff_allmultis);
  651. if (sdata->flags & IEEE80211_SDATA_PROMISC)
  652. atomic_dec(&local->iff_promiscs);
  653. if (sdata->vif.type == NL80211_IFTYPE_AP) {
  654. local->fif_pspoll--;
  655. local->fif_probe_req--;
  656. } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
  657. local->fif_probe_req--;
  658. }
  659. if (sdata->dev) {
  660. netif_addr_lock_bh(sdata->dev);
  661. spin_lock_bh(&local->filter_lock);
  662. __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
  663. sdata->dev->addr_len);
  664. spin_unlock_bh(&local->filter_lock);
  665. netif_addr_unlock_bh(sdata->dev);
  666. }
  667. del_timer_sync(&local->dynamic_ps_timer);
  668. cancel_work_sync(&local->dynamic_ps_enable_work);
  669. cancel_work_sync(&sdata->recalc_smps);
  670. cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
  671. if (sdata->wdev.cac_started) {
  672. WARN_ON(local->suspended);
  673. mutex_lock(&local->iflist_mtx);
  674. ieee80211_vif_release_channel(sdata);
  675. mutex_unlock(&local->iflist_mtx);
  676. cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
  677. GFP_KERNEL);
  678. }
  679. /* APs need special treatment */
  680. if (sdata->vif.type == NL80211_IFTYPE_AP) {
  681. struct ieee80211_sub_if_data *vlan, *tmpsdata;
  682. /* down all dependent devices, that is VLANs */
  683. list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
  684. u.vlan.list)
  685. dev_close(vlan->dev);
  686. WARN_ON(!list_empty(&sdata->u.ap.vlans));
  687. } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
  688. /* remove all packets in parent bc_buf pointing to this dev */
  689. ps = &sdata->bss->ps;
  690. spin_lock_irqsave(&ps->bc_buf.lock, flags);
  691. skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
  692. if (skb->dev == sdata->dev) {
  693. __skb_unlink(skb, &ps->bc_buf);
  694. local->total_ps_buffered--;
  695. ieee80211_free_txskb(&local->hw, skb);
  696. }
  697. }
  698. spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
  699. }
  700. if (going_down)
  701. local->open_count--;
  702. switch (sdata->vif.type) {
  703. case NL80211_IFTYPE_AP_VLAN:
  704. list_del(&sdata->u.vlan.list);
  705. rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
  706. /* no need to tell driver */
  707. break;
  708. case NL80211_IFTYPE_MONITOR:
  709. if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
  710. local->cooked_mntrs--;
  711. break;
  712. }
  713. local->monitors--;
  714. if (local->monitors == 0) {
  715. local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
  716. hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
  717. }
  718. ieee80211_adjust_monitor_flags(sdata, -1);
  719. break;
  720. case NL80211_IFTYPE_P2P_DEVICE:
  721. /* relies on synchronize_rcu() below */
  722. rcu_assign_pointer(local->p2p_sdata, NULL);
  723. /* fall through */
  724. default:
  725. cancel_work_sync(&sdata->work);
  726. /*
  727. * When we get here, the interface is marked down.
  728. *
  729. * sta_info_flush_cleanup() requires rcu_barrier()
  730. * first to wait for the station call_rcu() calls
  731. * to complete, and we also need synchronize_rcu()
  732. * to wait for the RX path in case it is using the
  733. * interface and enqueuing frames at this very time on
  734. * another CPU.
  735. */
  736. synchronize_rcu();
  737. rcu_barrier();
  738. sta_info_flush_cleanup(sdata);
  739. /*
  740. * Free all remaining keys, there shouldn't be any,
  741. * except maybe in WDS mode?
  742. */
  743. ieee80211_free_keys(sdata);
  744. /* fall through */
  745. case NL80211_IFTYPE_AP:
  746. skb_queue_purge(&sdata->skb_queue);
  747. }
  748. sdata->bss = NULL;
  749. spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
  750. for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
  751. skb_queue_walk_safe(&local->pending[i], skb, tmp) {
  752. struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  753. if (info->control.vif == &sdata->vif) {
  754. __skb_unlink(skb, &local->pending[i]);
  755. ieee80211_free_txskb(&local->hw, skb);
  756. }
  757. }
  758. }
  759. spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
  760. if (local->open_count == 0)
  761. ieee80211_clear_tx_pending(local);
  762. /*
  763. * If the interface goes down while suspended, presumably because
  764. * the device was unplugged and that happens before our resume,
  765. * then the driver is already unconfigured and the remainder of
  766. * this function isn't needed.
  767. * XXX: what about WoWLAN? If the device has software state, e.g.
  768. * memory allocated, it might expect teardown commands from
  769. * mac80211 here?
  770. */
  771. if (local->suspended) {
  772. WARN_ON(local->wowlan);
  773. WARN_ON(rtnl_dereference(local->monitor_sdata));
  774. return;
  775. }
  776. switch (sdata->vif.type) {
  777. case NL80211_IFTYPE_AP_VLAN:
  778. break;
  779. case NL80211_IFTYPE_MONITOR:
  780. if (local->monitors == 0)
  781. ieee80211_del_virtual_monitor(local);
  782. mutex_lock(&local->mtx);
  783. ieee80211_recalc_idle(local);
  784. mutex_unlock(&local->mtx);
  785. if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
  786. break;
  787. /* fall through */
  788. default:
  789. if (going_down)
  790. drv_remove_interface(local, sdata);
  791. }
  792. ieee80211_recalc_ps(local, -1);
  793. if (local->open_count == 0) {
  794. ieee80211_stop_device(local);
  795. /* no reconfiguring after stop! */
  796. return;
  797. }
  798. /* do after stop to avoid reconfiguring when we stop anyway */
  799. ieee80211_configure_filter(local);
  800. ieee80211_hw_config(local, hw_reconf_flags);
  801. if (local->monitors == local->open_count)
  802. ieee80211_add_virtual_monitor(local);
  803. }
  804. static int ieee80211_stop(struct net_device *dev)
  805. {
  806. struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  807. ieee80211_do_stop(sdata, true);
  808. return 0;
  809. }
  810. static void ieee80211_set_multicast_list(struct net_device *dev)
  811. {
  812. struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  813. struct ieee80211_local *local = sdata->local;
  814. int allmulti, promisc, sdata_allmulti, sdata_promisc;
  815. allmulti = !!(dev->flags & IFF_ALLMULTI);
  816. promisc = !!(dev->flags & IFF_PROMISC);
  817. sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
  818. sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
  819. if (allmulti != sdata_allmulti) {
  820. if (dev->flags & IFF_ALLMULTI)
  821. atomic_inc(&local->iff_allmultis);
  822. else
  823. atomic_dec(&local->iff_allmultis);
  824. sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
  825. }
  826. if (promisc != sdata_promisc) {
  827. if (dev->flags & IFF_PROMISC)
  828. atomic_inc(&local->iff_promiscs);
  829. else
  830. atomic_dec(&local->iff_promiscs);
  831. sdata->flags ^= IEEE80211_SDATA_PROMISC;
  832. }
  833. /*
  834. * TODO: If somebody needs this on AP interfaces,
  835. * it can be enabled easily but multicast
  836. * addresses from VLANs need to be synced.
  837. */
  838. if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
  839. sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
  840. sdata->vif.type != NL80211_IFTYPE_AP)
  841. drv_set_multicast_list(local, sdata, &dev->mc);
  842. spin_lock_bh(&local->filter_lock);
  843. __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
  844. spin_unlock_bh(&local->filter_lock);
  845. ieee80211_queue_work(&local->hw, &local->reconfig_filter);
  846. }
  847. /*
  848. * Called when the netdev is removed or, by the code below, before
  849. * the interface type changes.
  850. */
  851. static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
  852. {
  853. int flushed;
  854. int i;
  855. /* free extra data */
  856. ieee80211_free_keys(sdata);
  857. ieee80211_debugfs_remove_netdev(sdata);
  858. for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
  859. __skb_queue_purge(&sdata->fragments[i].skb_list);
  860. sdata->fragment_next = 0;
  861. if (ieee80211_vif_is_mesh(&sdata->vif))
  862. mesh_rmc_free(sdata);
  863. flushed = sta_info_flush(sdata);
  864. WARN_ON(flushed);
  865. }
  866. static void ieee80211_uninit(struct net_device *dev)
  867. {
  868. ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
  869. }
  870. static u16 ieee80211_netdev_select_queue(struct net_device *dev,
  871. struct sk_buff *skb)
  872. {
  873. return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
  874. }
  875. static const struct net_device_ops ieee80211_dataif_ops = {
  876. .ndo_open = ieee80211_open,
  877. .ndo_stop = ieee80211_stop,
  878. .ndo_uninit = ieee80211_uninit,
  879. .ndo_start_xmit = ieee80211_subif_start_xmit,
  880. .ndo_set_rx_mode = ieee80211_set_multicast_list,
  881. .ndo_change_mtu = ieee80211_change_mtu,
  882. .ndo_set_mac_address = ieee80211_change_mac,
  883. .ndo_select_queue = ieee80211_netdev_select_queue,
  884. };
  885. static u16 ieee80211_monitor_select_queue(struct net_device *dev,
  886. struct sk_buff *skb)
  887. {
  888. struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  889. struct ieee80211_local *local = sdata->local;
  890. struct ieee80211_hdr *hdr;
  891. struct ieee80211_radiotap_header *rtap = (void *)skb->data;
  892. if (local->hw.queues < IEEE80211_NUM_ACS)
  893. return 0;
  894. if (skb->len < 4 ||
  895. skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
  896. return 0; /* doesn't matter, frame will be dropped */
  897. hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
  898. return ieee80211_select_queue_80211(sdata, skb, hdr);
  899. }
  900. static const struct net_device_ops ieee80211_monitorif_ops = {
  901. .ndo_open = ieee80211_open,
  902. .ndo_stop = ieee80211_stop,
  903. .ndo_uninit = ieee80211_uninit,
  904. .ndo_start_xmit = ieee80211_monitor_start_xmit,
  905. .ndo_set_rx_mode = ieee80211_set_multicast_list,
  906. .ndo_change_mtu = ieee80211_change_mtu,
  907. .ndo_set_mac_address = ieee80211_change_mac,
  908. .ndo_select_queue = ieee80211_monitor_select_queue,
  909. };
  910. static void ieee80211_if_setup(struct net_device *dev)
  911. {
  912. ether_setup(dev);
  913. dev->priv_flags &= ~IFF_TX_SKB_SHARING;
  914. dev->netdev_ops = &ieee80211_dataif_ops;
  915. dev->destructor = free_netdev;
  916. }
  917. static void ieee80211_iface_work(struct work_struct *work)
  918. {
  919. struct ieee80211_sub_if_data *sdata =
  920. container_of(work, struct ieee80211_sub_if_data, work);
  921. struct ieee80211_local *local = sdata->local;
  922. struct sk_buff *skb;
  923. struct sta_info *sta;
  924. struct ieee80211_ra_tid *ra_tid;
  925. if (!ieee80211_sdata_running(sdata))
  926. return;
  927. if (local->scanning)
  928. return;
  929. /*
  930. * ieee80211_queue_work() should have picked up most cases,
  931. * here we'll pick the rest.
  932. */
  933. if (WARN(local->suspended,
  934. "interface work scheduled while going to suspend\n"))
  935. return;
  936. /* first process frames */
  937. while ((skb = skb_dequeue(&sdata->skb_queue))) {
  938. struct ieee80211_mgmt *mgmt = (void *)skb->data;
  939. if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
  940. ra_tid = (void *)&skb->cb;
  941. ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
  942. ra_tid->tid);
  943. } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
  944. ra_tid = (void *)&skb->cb;
  945. ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
  946. ra_tid->tid);
  947. } else if (ieee80211_is_action(mgmt->frame_control) &&
  948. mgmt->u.action.category == WLAN_CATEGORY_BACK) {
  949. int len = skb->len;
  950. mutex_lock(&local->sta_mtx);
  951. sta = sta_info_get_bss(sdata, mgmt->sa);
  952. if (sta) {
  953. switch (mgmt->u.action.u.addba_req.action_code) {
  954. case WLAN_ACTION_ADDBA_REQ:
  955. ieee80211_process_addba_request(
  956. local, sta, mgmt, len);
  957. break;
  958. case WLAN_ACTION_ADDBA_RESP:
  959. ieee80211_process_addba_resp(local, sta,
  960. mgmt, len);
  961. break;
  962. case WLAN_ACTION_DELBA:
  963. ieee80211_process_delba(sdata, sta,
  964. mgmt, len);
  965. break;
  966. default:
  967. WARN_ON(1);
  968. break;
  969. }
  970. }
  971. mutex_unlock(&local->sta_mtx);
  972. } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
  973. struct ieee80211_hdr *hdr = (void *)mgmt;
  974. /*
  975. * So the frame isn't mgmt, but frame_control
  976. * is at the right place anyway, of course, so
  977. * the if statement is correct.
  978. *
  979. * Warn if we have other data frame types here,
  980. * they must not get here.
  981. */
  982. WARN_ON(hdr->frame_control &
  983. cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
  984. WARN_ON(!(hdr->seq_ctrl &
  985. cpu_to_le16(IEEE80211_SCTL_FRAG)));
  986. /*
  987. * This was a fragment of a frame, received while
  988. * a block-ack session was active. That cannot be
  989. * right, so terminate the session.
  990. */
  991. mutex_lock(&local->sta_mtx);
  992. sta = sta_info_get_bss(sdata, mgmt->sa);
  993. if (sta) {
  994. u16 tid = *ieee80211_get_qos_ctl(hdr) &
  995. IEEE80211_QOS_CTL_TID_MASK;
  996. __ieee80211_stop_rx_ba_session(
  997. sta, tid, WLAN_BACK_RECIPIENT,
  998. WLAN_REASON_QSTA_REQUIRE_SETUP,
  999. true);
  1000. }
  1001. mutex_unlock(&local->sta_mtx);
  1002. } else switch (sdata->vif.type) {
  1003. case NL80211_IFTYPE_STATION:
  1004. ieee80211_sta_rx_queued_mgmt(sdata, skb);
  1005. break;
  1006. case NL80211_IFTYPE_ADHOC:
  1007. ieee80211_ibss_rx_queued_mgmt(sdata, skb);
  1008. break;
  1009. case NL80211_IFTYPE_MESH_POINT:
  1010. if (!ieee80211_vif_is_mesh(&sdata->vif))
  1011. break;
  1012. ieee80211_mesh_rx_queued_mgmt(sdata, skb);
  1013. break;
  1014. default:
  1015. WARN(1, "frame for unexpected interface type");
  1016. break;
  1017. }
  1018. kfree_skb(skb);
  1019. }
  1020. /* then other type-dependent work */
  1021. switch (sdata->vif.type) {
  1022. case NL80211_IFTYPE_STATION:
  1023. ieee80211_sta_work(sdata);
  1024. break;
  1025. case NL80211_IFTYPE_ADHOC:
  1026. ieee80211_ibss_work(sdata);
  1027. break;
  1028. case NL80211_IFTYPE_MESH_POINT:
  1029. if (!ieee80211_vif_is_mesh(&sdata->vif))
  1030. break;
  1031. ieee80211_mesh_work(sdata);
  1032. break;
  1033. default:
  1034. break;
  1035. }
  1036. }
  1037. static void ieee80211_recalc_smps_work(struct work_struct *work)
  1038. {
  1039. struct ieee80211_sub_if_data *sdata =
  1040. container_of(work, struct ieee80211_sub_if_data, recalc_smps);
  1041. ieee80211_recalc_smps(sdata);
  1042. }
  1043. /*
  1044. * Helper function to initialise an interface to a specific type.
  1045. */
  1046. static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
  1047. enum nl80211_iftype type)
  1048. {
  1049. /* clear type-dependent union */
  1050. memset(&sdata->u, 0, sizeof(sdata->u));
  1051. /* and set some type-dependent values */
  1052. sdata->vif.type = type;
  1053. sdata->vif.p2p = false;
  1054. sdata->wdev.iftype = type;
  1055. sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
  1056. sdata->control_port_no_encrypt = false;
  1057. sdata->noack_map = 0;
  1058. /* only monitor/p2p-device differ */
  1059. if (sdata->dev) {
  1060. sdata->dev->netdev_ops = &ieee80211_dataif_ops;
  1061. sdata->dev->type = ARPHRD_ETHER;
  1062. }
  1063. skb_queue_head_init(&sdata->skb_queue);
  1064. INIT_WORK(&sdata->work, ieee80211_iface_work);
  1065. INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
  1066. switch (type) {
  1067. case NL80211_IFTYPE_P2P_GO:
  1068. type = NL80211_IFTYPE_AP;
  1069. sdata->vif.type = type;
  1070. sdata->vif.p2p = true;
  1071. /* fall through */
  1072. case NL80211_IFTYPE_AP:
  1073. skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
  1074. INIT_LIST_HEAD(&sdata->u.ap.vlans);
  1075. sdata->vif.bss_conf.bssid = sdata->vif.addr;
  1076. break;
  1077. case NL80211_IFTYPE_P2P_CLIENT:
  1078. type = NL80211_IFTYPE_STATION;
  1079. sdata->vif.type = type;
  1080. sdata->vif.p2p = true;
  1081. /* fall through */
  1082. case NL80211_IFTYPE_STATION:
  1083. sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
  1084. ieee80211_sta_setup_sdata(sdata);
  1085. break;
  1086. case NL80211_IFTYPE_ADHOC:
  1087. sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
  1088. ieee80211_ibss_setup_sdata(sdata);
  1089. break;
  1090. case NL80211_IFTYPE_MESH_POINT:
  1091. if (ieee80211_vif_is_mesh(&sdata->vif))
  1092. ieee80211_mesh_init_sdata(sdata);
  1093. break;
  1094. case NL80211_IFTYPE_MONITOR:
  1095. sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
  1096. sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
  1097. sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
  1098. MONITOR_FLAG_OTHER_BSS;
  1099. break;
  1100. case NL80211_IFTYPE_WDS:
  1101. sdata->vif.bss_conf.bssid = NULL;
  1102. break;
  1103. case NL80211_IFTYPE_AP_VLAN:
  1104. break;
  1105. case NL80211_IFTYPE_P2P_DEVICE:
  1106. sdata->vif.bss_conf.bssid = sdata->vif.addr;
  1107. break;
  1108. case NL80211_IFTYPE_UNSPECIFIED:
  1109. case NUM_NL80211_IFTYPES:
  1110. BUG();
  1111. break;
  1112. }
  1113. ieee80211_debugfs_add_netdev(sdata);
  1114. }
  1115. static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
  1116. enum nl80211_iftype type)
  1117. {
  1118. struct ieee80211_local *local = sdata->local;
  1119. int ret, err;
  1120. enum nl80211_iftype internal_type = type;
  1121. bool p2p = false;
  1122. ASSERT_RTNL();
  1123. if (!local->ops->change_interface)
  1124. return -EBUSY;
  1125. switch (sdata->vif.type) {
  1126. case NL80211_IFTYPE_AP:
  1127. case NL80211_IFTYPE_STATION:
  1128. case NL80211_IFTYPE_ADHOC:
  1129. /*
  1130. * Could maybe also all others here?
  1131. * Just not sure how that interacts
  1132. * with the RX/config path e.g. for
  1133. * mesh.
  1134. */
  1135. break;
  1136. default:
  1137. return -EBUSY;
  1138. }
  1139. switch (type) {
  1140. case NL80211_IFTYPE_AP:
  1141. case NL80211_IFTYPE_STATION:
  1142. case NL80211_IFTYPE_ADHOC:
  1143. /*
  1144. * Could probably support everything
  1145. * but WDS here (WDS do_open can fail
  1146. * under memory pressure, which this
  1147. * code isn't prepared to handle).
  1148. */
  1149. break;
  1150. case NL80211_IFTYPE_P2P_CLIENT:
  1151. p2p = true;
  1152. internal_type = NL80211_IFTYPE_STATION;
  1153. break;
  1154. case NL80211_IFTYPE_P2P_GO:
  1155. p2p = true;
  1156. internal_type = NL80211_IFTYPE_AP;
  1157. break;
  1158. default:
  1159. return -EBUSY;
  1160. }
  1161. ret = ieee80211_check_concurrent_iface(sdata, internal_type);
  1162. if (ret)
  1163. return ret;
  1164. ieee80211_do_stop(sdata, false);
  1165. ieee80211_teardown_sdata(sdata);
  1166. ret = drv_change_interface(local, sdata, internal_type, p2p);
  1167. if (ret)
  1168. type = sdata->vif.type;
  1169. /*
  1170. * Ignore return value here, there's not much we can do since
  1171. * the driver changed the interface type internally already.
  1172. * The warnings will hopefully make driver authors fix it :-)
  1173. */
  1174. ieee80211_check_queues(sdata);
  1175. ieee80211_setup_sdata(sdata, type);
  1176. err = ieee80211_do_open(&sdata->wdev, false);
  1177. WARN(err, "type change: do_open returned %d", err);
  1178. return ret;
  1179. }
  1180. int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
  1181. enum nl80211_iftype type)
  1182. {
  1183. int ret;
  1184. ASSERT_RTNL();
  1185. if (type == ieee80211_vif_type_p2p(&sdata->vif))
  1186. return 0;
  1187. if (ieee80211_sdata_running(sdata)) {
  1188. ret = ieee80211_runtime_change_iftype(sdata, type);
  1189. if (ret)
  1190. return ret;
  1191. } else {
  1192. /* Purge and reset type-dependent state. */
  1193. ieee80211_teardown_sdata(sdata);
  1194. ieee80211_setup_sdata(sdata, type);
  1195. }
  1196. /* reset some values that shouldn't be kept across type changes */
  1197. sdata->drop_unencrypted = 0;
  1198. if (type == NL80211_IFTYPE_STATION)
  1199. sdata->u.mgd.use_4addr = false;
  1200. return 0;
  1201. }
  1202. static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
  1203. u8 *perm_addr, enum nl80211_iftype type)
  1204. {
  1205. struct ieee80211_sub_if_data *sdata;
  1206. u64 mask, start, addr, val, inc;
  1207. u8 *m;
  1208. u8 tmp_addr[ETH_ALEN];
  1209. int i;
  1210. /* default ... something at least */
  1211. memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
  1212. if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
  1213. local->hw.wiphy->n_addresses <= 1)
  1214. return;
  1215. mutex_lock(&local->iflist_mtx);
  1216. switch (type) {
  1217. case NL80211_IFTYPE_MONITOR:
  1218. /* doesn't matter */
  1219. break;
  1220. case NL80211_IFTYPE_WDS:
  1221. case NL80211_IFTYPE_AP_VLAN:
  1222. /* match up with an AP interface */
  1223. list_for_each_entry(sdata, &local->interfaces, list) {
  1224. if (sdata->vif.type != NL80211_IFTYPE_AP)
  1225. continue;
  1226. memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
  1227. break;
  1228. }
  1229. /* keep default if no AP interface present */
  1230. break;
  1231. case NL80211_IFTYPE_P2P_CLIENT:
  1232. case NL80211_IFTYPE_P2P_GO:
  1233. if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
  1234. list_for_each_entry(sdata, &local->interfaces, list) {
  1235. if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
  1236. continue;
  1237. if (!ieee80211_sdata_running(sdata))
  1238. continue;
  1239. memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
  1240. goto out_unlock;
  1241. }
  1242. }
  1243. /* otherwise fall through */
  1244. default:
  1245. /* assign a new address if possible -- try n_addresses first */
  1246. for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
  1247. bool used = false;
  1248. list_for_each_entry(sdata, &local->interfaces, list) {
  1249. if (memcmp(local->hw.wiphy->addresses[i].addr,
  1250. sdata->vif.addr, ETH_ALEN) == 0) {
  1251. used = true;
  1252. break;
  1253. }
  1254. }
  1255. if (!used) {
  1256. memcpy(perm_addr,
  1257. local->hw.wiphy->addresses[i].addr,
  1258. ETH_ALEN);
  1259. break;
  1260. }
  1261. }
  1262. /* try mask if available */
  1263. if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
  1264. break;
  1265. m = local->hw.wiphy->addr_mask;
  1266. mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
  1267. ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
  1268. ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
  1269. if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
  1270. /* not a contiguous mask ... not handled now! */
  1271. pr_info("not contiguous\n");
  1272. break;
  1273. }
  1274. /*
  1275. * Pick address of existing interface in case user changed
  1276. * MAC address manually, default to perm_addr.
  1277. */
  1278. m = local->hw.wiphy->perm_addr;
  1279. list_for_each_entry(sdata, &local->interfaces, list) {
  1280. if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
  1281. continue;
  1282. m = sdata->vif.addr;
  1283. break;
  1284. }
  1285. start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
  1286. ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
  1287. ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
  1288. inc = 1ULL<<__ffs64(mask);
  1289. val = (start & mask);
  1290. addr = (start & ~mask) | (val & mask);
  1291. do {
  1292. bool used = false;
  1293. tmp_addr[5] = addr >> 0*8;
  1294. tmp_addr[4] = addr >> 1*8;
  1295. tmp_addr[3] = addr >> 2*8;
  1296. tmp_addr[2] = addr >> 3*8;
  1297. tmp_addr[1] = addr >> 4*8;
  1298. tmp_addr[0] = addr >> 5*8;
  1299. val += inc;
  1300. list_for_each_entry(sdata, &local->interfaces, list) {
  1301. if (memcmp(tmp_addr, sdata->vif.addr,
  1302. ETH_ALEN) == 0) {
  1303. used = true;
  1304. break;
  1305. }
  1306. }
  1307. if (!used) {
  1308. memcpy(perm_addr, tmp_addr, ETH_ALEN);
  1309. break;
  1310. }
  1311. addr = (start & ~mask) | (val & mask);
  1312. } while (addr != start);
  1313. break;
  1314. }
  1315. out_unlock:
  1316. mutex_unlock(&local->iflist_mtx);
  1317. }
  1318. static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
  1319. {
  1320. struct ieee80211_sub_if_data *sdata;
  1321. sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
  1322. ieee80211_cleanup_sdata_stas(sdata);
  1323. }
  1324. int ieee80211_if_add(struct ieee80211_local *local, const char *name,
  1325. struct wireless_dev **new_wdev, enum nl80211_iftype type,
  1326. struct vif_params *params)
  1327. {
  1328. struct net_device *ndev = NULL;
  1329. struct ieee80211_sub_if_data *sdata = NULL;
  1330. int ret, i;
  1331. int txqs = 1;
  1332. ASSERT_RTNL();
  1333. if (type == NL80211_IFTYPE_P2P_DEVICE) {
  1334. struct wireless_dev *wdev;
  1335. sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
  1336. GFP_KERNEL);
  1337. if (!sdata)
  1338. return -ENOMEM;
  1339. wdev = &sdata->wdev;
  1340. sdata->dev = NULL;
  1341. strlcpy(sdata->name, name, IFNAMSIZ);
  1342. ieee80211_assign_perm_addr(local, wdev->address, type);
  1343. memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
  1344. } else {
  1345. if (local->hw.queues >= IEEE80211_NUM_ACS)
  1346. txqs = IEEE80211_NUM_ACS;
  1347. ndev = alloc_netdev_mqs(sizeof(*sdata) +
  1348. local->hw.vif_data_size,
  1349. name, ieee80211_if_setup, txqs, 1);
  1350. if (!ndev)
  1351. return -ENOMEM;
  1352. dev_net_set(ndev, wiphy_net(local->hw.wiphy));
  1353. ndev->needed_headroom = local->tx_headroom +
  1354. 4*6 /* four MAC addresses */
  1355. + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
  1356. + 6 /* mesh */
  1357. + 8 /* rfc1042/bridge tunnel */
  1358. - ETH_HLEN /* ethernet hard_header_len */
  1359. + IEEE80211_ENCRYPT_HEADROOM;
  1360. ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
  1361. ret = dev_alloc_name(ndev, ndev->name);
  1362. if (ret < 0) {
  1363. free_netdev(ndev);
  1364. return ret;
  1365. }
  1366. ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
  1367. memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
  1368. SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
  1369. /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
  1370. sdata = netdev_priv(ndev);
  1371. ndev->ieee80211_ptr = &sdata->wdev;
  1372. memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
  1373. memcpy(sdata->name, ndev->name, IFNAMSIZ);
  1374. sdata->dev = ndev;
  1375. }
  1376. /* initialise type-independent data */
  1377. sdata->wdev.wiphy = local->hw.wiphy;
  1378. sdata->local = local;
  1379. for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
  1380. skb_queue_head_init(&sdata->fragments[i].skb_list);
  1381. INIT_LIST_HEAD(&sdata->key_list);
  1382. spin_lock_init(&sdata->cleanup_stations_lock);
  1383. INIT_LIST_HEAD(&sdata->cleanup_stations);
  1384. INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
  1385. INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
  1386. ieee80211_dfs_cac_timer_work);
  1387. INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
  1388. ieee80211_delayed_tailroom_dec);
  1389. for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
  1390. struct ieee80211_supported_band *sband;
  1391. sband = local->hw.wiphy->bands[i];
  1392. sdata->rc_rateidx_mask[i] =
  1393. sband ? (1 << sband->n_bitrates) - 1 : 0;
  1394. if (sband)
  1395. memcpy(sdata->rc_rateidx_mcs_mask[i],
  1396. sband->ht_cap.mcs.rx_mask,
  1397. sizeof(sdata->rc_rateidx_mcs_mask[i]));
  1398. else
  1399. memset(sdata->rc_rateidx_mcs_mask[i], 0,
  1400. sizeof(sdata->rc_rateidx_mcs_mask[i]));
  1401. }
  1402. ieee80211_set_default_queues(sdata);
  1403. sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
  1404. sdata->user_power_level = local->user_power_level;
  1405. /* setup type-dependent data */
  1406. ieee80211_setup_sdata(sdata, type);
  1407. if (ndev) {
  1408. if (params) {
  1409. ndev->ieee80211_ptr->use_4addr = params->use_4addr;
  1410. if (type == NL80211_IFTYPE_STATION)
  1411. sdata->u.mgd.use_4addr = params->use_4addr;
  1412. }
  1413. ndev->features |= local->hw.netdev_features;
  1414. ret = register_netdevice(ndev);
  1415. if (ret) {
  1416. free_netdev(ndev);
  1417. return ret;
  1418. }
  1419. }
  1420. mutex_lock(&local->iflist_mtx);
  1421. list_add_tail_rcu(&sdata->list, &local->interfaces);
  1422. mutex_unlock(&local->iflist_mtx);
  1423. if (new_wdev)
  1424. *new_wdev = &sdata->wdev;
  1425. return 0;
  1426. }
  1427. void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
  1428. {
  1429. ASSERT_RTNL();
  1430. mutex_lock(&sdata->local->iflist_mtx);
  1431. list_del_rcu(&sdata->list);
  1432. mutex_unlock(&sdata->local->iflist_mtx);
  1433. synchronize_rcu();
  1434. if (sdata->dev) {
  1435. unregister_netdevice(sdata->dev);
  1436. } else {
  1437. cfg80211_unregister_wdev(&sdata->wdev);
  1438. kfree(sdata);
  1439. }
  1440. }
  1441. void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
  1442. {
  1443. if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
  1444. return;
  1445. ieee80211_do_stop(sdata, true);
  1446. ieee80211_teardown_sdata(sdata);
  1447. }
  1448. /*
  1449. * Remove all interfaces, may only be called at hardware unregistration
  1450. * time because it doesn't do RCU-safe list removals.
  1451. */
  1452. void ieee80211_remove_interfaces(struct ieee80211_local *local)
  1453. {
  1454. struct ieee80211_sub_if_data *sdata, *tmp;
  1455. LIST_HEAD(unreg_list);
  1456. LIST_HEAD(wdev_list);
  1457. ASSERT_RTNL();
  1458. /*
  1459. * Close all AP_VLAN interfaces first, as otherwise they
  1460. * might be closed while the AP interface they belong to
  1461. * is closed, causing unregister_netdevice_many() to crash.
  1462. */
  1463. list_for_each_entry(sdata, &local->interfaces, list)
  1464. if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
  1465. dev_close(sdata->dev);
  1466. mutex_lock(&local->iflist_mtx);
  1467. list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
  1468. list_del(&sdata->list);
  1469. if (sdata->dev)
  1470. unregister_netdevice_queue(sdata->dev, &unreg_list);
  1471. else
  1472. list_add(&sdata->list, &wdev_list);
  1473. }
  1474. mutex_unlock(&local->iflist_mtx);
  1475. unregister_netdevice_many(&unreg_list);
  1476. list_del(&unreg_list);
  1477. list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
  1478. list_del(&sdata->list);
  1479. cfg80211_unregister_wdev(&sdata->wdev);
  1480. kfree(sdata);
  1481. }
  1482. }
  1483. static int netdev_notify(struct notifier_block *nb,
  1484. unsigned long state, void *ptr)
  1485. {
  1486. struct net_device *dev = netdev_notifier_info_to_dev(ptr);
  1487. struct ieee80211_sub_if_data *sdata;
  1488. if (state != NETDEV_CHANGENAME)
  1489. return 0;
  1490. if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
  1491. return 0;
  1492. if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
  1493. return 0;
  1494. sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  1495. memcpy(sdata->name, dev->name, IFNAMSIZ);
  1496. ieee80211_debugfs_rename_netdev(sdata);
  1497. return 0;
  1498. }
  1499. static struct notifier_block mac80211_netdev_notifier = {
  1500. .notifier_call = netdev_notify,
  1501. };
  1502. int ieee80211_iface_init(void)
  1503. {
  1504. return register_netdevice_notifier(&mac80211_netdev_notifier);
  1505. }
  1506. void ieee80211_iface_exit(void)
  1507. {
  1508. unregister_netdevice_notifier(&mac80211_netdev_notifier);
  1509. }