iface.c 46 KB

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  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 = ieee80211_chandef_max_power(&chanctx_conf->def);
  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. * will not add another interface while any channel
  231. * switch is active.
  232. */
  233. if (nsdata->vif.csa_active)
  234. return -EBUSY;
  235. /*
  236. * The remaining checks are only performed for interfaces
  237. * with the same MAC address.
  238. */
  239. if (!ether_addr_equal(sdata->vif.addr,
  240. nsdata->vif.addr))
  241. continue;
  242. /*
  243. * check whether it may have the same address
  244. */
  245. if (!identical_mac_addr_allowed(iftype,
  246. nsdata->vif.type))
  247. return -ENOTUNIQ;
  248. /*
  249. * can only add VLANs to enabled APs
  250. */
  251. if (iftype == NL80211_IFTYPE_AP_VLAN &&
  252. nsdata->vif.type == NL80211_IFTYPE_AP)
  253. sdata->bss = &nsdata->u.ap;
  254. }
  255. }
  256. return 0;
  257. }
  258. static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
  259. enum nl80211_iftype iftype)
  260. {
  261. int n_queues = sdata->local->hw.queues;
  262. int i;
  263. if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
  264. for (i = 0; i < IEEE80211_NUM_ACS; i++) {
  265. if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
  266. IEEE80211_INVAL_HW_QUEUE))
  267. return -EINVAL;
  268. if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
  269. n_queues))
  270. return -EINVAL;
  271. }
  272. }
  273. if ((iftype != NL80211_IFTYPE_AP &&
  274. iftype != NL80211_IFTYPE_P2P_GO &&
  275. iftype != NL80211_IFTYPE_MESH_POINT) ||
  276. !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
  277. sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
  278. return 0;
  279. }
  280. if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
  281. return -EINVAL;
  282. if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
  283. return -EINVAL;
  284. return 0;
  285. }
  286. void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
  287. const int offset)
  288. {
  289. struct ieee80211_local *local = sdata->local;
  290. u32 flags = sdata->u.mntr_flags;
  291. #define ADJUST(_f, _s) do { \
  292. if (flags & MONITOR_FLAG_##_f) \
  293. local->fif_##_s += offset; \
  294. } while (0)
  295. ADJUST(FCSFAIL, fcsfail);
  296. ADJUST(PLCPFAIL, plcpfail);
  297. ADJUST(CONTROL, control);
  298. ADJUST(CONTROL, pspoll);
  299. ADJUST(OTHER_BSS, other_bss);
  300. #undef ADJUST
  301. }
  302. static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
  303. {
  304. struct ieee80211_local *local = sdata->local;
  305. int i;
  306. for (i = 0; i < IEEE80211_NUM_ACS; i++) {
  307. if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
  308. sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
  309. else if (local->hw.queues >= IEEE80211_NUM_ACS)
  310. sdata->vif.hw_queue[i] = i;
  311. else
  312. sdata->vif.hw_queue[i] = 0;
  313. }
  314. sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
  315. }
  316. int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
  317. {
  318. struct ieee80211_sub_if_data *sdata;
  319. int ret;
  320. if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
  321. return 0;
  322. ASSERT_RTNL();
  323. if (local->monitor_sdata)
  324. return 0;
  325. sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
  326. if (!sdata)
  327. return -ENOMEM;
  328. /* set up data */
  329. sdata->local = local;
  330. sdata->vif.type = NL80211_IFTYPE_MONITOR;
  331. snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
  332. wiphy_name(local->hw.wiphy));
  333. ieee80211_set_default_queues(sdata);
  334. ret = drv_add_interface(local, sdata);
  335. if (WARN_ON(ret)) {
  336. /* ok .. stupid driver, it asked for this! */
  337. kfree(sdata);
  338. return ret;
  339. }
  340. ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
  341. if (ret) {
  342. kfree(sdata);
  343. return ret;
  344. }
  345. ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
  346. IEEE80211_CHANCTX_EXCLUSIVE);
  347. if (ret) {
  348. drv_remove_interface(local, sdata);
  349. kfree(sdata);
  350. return ret;
  351. }
  352. mutex_lock(&local->iflist_mtx);
  353. rcu_assign_pointer(local->monitor_sdata, sdata);
  354. mutex_unlock(&local->iflist_mtx);
  355. return 0;
  356. }
  357. void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
  358. {
  359. struct ieee80211_sub_if_data *sdata;
  360. if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
  361. return;
  362. ASSERT_RTNL();
  363. mutex_lock(&local->iflist_mtx);
  364. sdata = rcu_dereference_protected(local->monitor_sdata,
  365. lockdep_is_held(&local->iflist_mtx));
  366. if (!sdata) {
  367. mutex_unlock(&local->iflist_mtx);
  368. return;
  369. }
  370. rcu_assign_pointer(local->monitor_sdata, NULL);
  371. mutex_unlock(&local->iflist_mtx);
  372. synchronize_net();
  373. ieee80211_vif_release_channel(sdata);
  374. drv_remove_interface(local, sdata);
  375. kfree(sdata);
  376. }
  377. /*
  378. * NOTE: Be very careful when changing this function, it must NOT return
  379. * an error on interface type changes that have been pre-checked, so most
  380. * checks should be in ieee80211_check_concurrent_iface.
  381. */
  382. int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
  383. {
  384. struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
  385. struct net_device *dev = wdev->netdev;
  386. struct ieee80211_local *local = sdata->local;
  387. struct sta_info *sta;
  388. u32 changed = 0;
  389. int res;
  390. u32 hw_reconf_flags = 0;
  391. switch (sdata->vif.type) {
  392. case NL80211_IFTYPE_WDS:
  393. if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
  394. return -ENOLINK;
  395. break;
  396. case NL80211_IFTYPE_AP_VLAN: {
  397. struct ieee80211_sub_if_data *master;
  398. if (!sdata->bss)
  399. return -ENOLINK;
  400. list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
  401. master = container_of(sdata->bss,
  402. struct ieee80211_sub_if_data, u.ap);
  403. sdata->control_port_protocol =
  404. master->control_port_protocol;
  405. sdata->control_port_no_encrypt =
  406. master->control_port_no_encrypt;
  407. sdata->vif.cab_queue = master->vif.cab_queue;
  408. memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
  409. sizeof(sdata->vif.hw_queue));
  410. break;
  411. }
  412. case NL80211_IFTYPE_AP:
  413. sdata->bss = &sdata->u.ap;
  414. break;
  415. case NL80211_IFTYPE_MESH_POINT:
  416. case NL80211_IFTYPE_STATION:
  417. case NL80211_IFTYPE_MONITOR:
  418. case NL80211_IFTYPE_ADHOC:
  419. case NL80211_IFTYPE_P2P_DEVICE:
  420. /* no special treatment */
  421. break;
  422. case NL80211_IFTYPE_UNSPECIFIED:
  423. case NUM_NL80211_IFTYPES:
  424. case NL80211_IFTYPE_P2P_CLIENT:
  425. case NL80211_IFTYPE_P2P_GO:
  426. /* cannot happen */
  427. WARN_ON(1);
  428. break;
  429. }
  430. if (local->open_count == 0) {
  431. res = drv_start(local);
  432. if (res)
  433. goto err_del_bss;
  434. /* we're brought up, everything changes */
  435. hw_reconf_flags = ~0;
  436. ieee80211_led_radio(local, true);
  437. ieee80211_mod_tpt_led_trig(local,
  438. IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
  439. }
  440. /*
  441. * Copy the hopefully now-present MAC address to
  442. * this interface, if it has the special null one.
  443. */
  444. if (dev && is_zero_ether_addr(dev->dev_addr)) {
  445. memcpy(dev->dev_addr,
  446. local->hw.wiphy->perm_addr,
  447. ETH_ALEN);
  448. memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
  449. if (!is_valid_ether_addr(dev->dev_addr)) {
  450. res = -EADDRNOTAVAIL;
  451. goto err_stop;
  452. }
  453. }
  454. switch (sdata->vif.type) {
  455. case NL80211_IFTYPE_AP_VLAN:
  456. /* no need to tell driver, but set carrier and chanctx */
  457. if (rtnl_dereference(sdata->bss->beacon)) {
  458. ieee80211_vif_vlan_copy_chanctx(sdata);
  459. netif_carrier_on(dev);
  460. } else {
  461. netif_carrier_off(dev);
  462. }
  463. break;
  464. case NL80211_IFTYPE_MONITOR:
  465. if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
  466. local->cooked_mntrs++;
  467. break;
  468. }
  469. if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
  470. res = drv_add_interface(local, sdata);
  471. if (res)
  472. goto err_stop;
  473. } else if (local->monitors == 0 && local->open_count == 0) {
  474. res = ieee80211_add_virtual_monitor(local);
  475. if (res)
  476. goto err_stop;
  477. }
  478. /* must be before the call to ieee80211_configure_filter */
  479. local->monitors++;
  480. if (local->monitors == 1) {
  481. local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
  482. hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
  483. }
  484. ieee80211_adjust_monitor_flags(sdata, 1);
  485. ieee80211_configure_filter(local);
  486. mutex_lock(&local->mtx);
  487. ieee80211_recalc_idle(local);
  488. mutex_unlock(&local->mtx);
  489. netif_carrier_on(dev);
  490. break;
  491. default:
  492. if (coming_up) {
  493. ieee80211_del_virtual_monitor(local);
  494. res = drv_add_interface(local, sdata);
  495. if (res)
  496. goto err_stop;
  497. res = ieee80211_check_queues(sdata,
  498. ieee80211_vif_type_p2p(&sdata->vif));
  499. if (res)
  500. goto err_del_interface;
  501. }
  502. if (sdata->vif.type == NL80211_IFTYPE_AP) {
  503. local->fif_pspoll++;
  504. local->fif_probe_req++;
  505. ieee80211_configure_filter(local);
  506. } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
  507. local->fif_probe_req++;
  508. }
  509. if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
  510. changed |= ieee80211_reset_erp_info(sdata);
  511. ieee80211_bss_info_change_notify(sdata, changed);
  512. switch (sdata->vif.type) {
  513. case NL80211_IFTYPE_STATION:
  514. case NL80211_IFTYPE_ADHOC:
  515. case NL80211_IFTYPE_AP:
  516. case NL80211_IFTYPE_MESH_POINT:
  517. netif_carrier_off(dev);
  518. break;
  519. case NL80211_IFTYPE_WDS:
  520. case NL80211_IFTYPE_P2P_DEVICE:
  521. break;
  522. default:
  523. /* not reached */
  524. WARN_ON(1);
  525. }
  526. /*
  527. * set default queue parameters so drivers don't
  528. * need to initialise the hardware if the hardware
  529. * doesn't start up with sane defaults
  530. */
  531. ieee80211_set_wmm_default(sdata, true);
  532. }
  533. set_bit(SDATA_STATE_RUNNING, &sdata->state);
  534. if (sdata->vif.type == NL80211_IFTYPE_WDS) {
  535. /* Create STA entry for the WDS peer */
  536. sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
  537. GFP_KERNEL);
  538. if (!sta) {
  539. res = -ENOMEM;
  540. goto err_del_interface;
  541. }
  542. sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
  543. sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
  544. sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
  545. res = sta_info_insert(sta);
  546. if (res) {
  547. /* STA has been freed */
  548. goto err_del_interface;
  549. }
  550. rate_control_rate_init(sta);
  551. netif_carrier_on(dev);
  552. } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
  553. rcu_assign_pointer(local->p2p_sdata, sdata);
  554. }
  555. /*
  556. * set_multicast_list will be invoked by the networking core
  557. * which will check whether any increments here were done in
  558. * error and sync them down to the hardware as filter flags.
  559. */
  560. if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
  561. atomic_inc(&local->iff_allmultis);
  562. if (sdata->flags & IEEE80211_SDATA_PROMISC)
  563. atomic_inc(&local->iff_promiscs);
  564. if (coming_up)
  565. local->open_count++;
  566. if (hw_reconf_flags)
  567. ieee80211_hw_config(local, hw_reconf_flags);
  568. ieee80211_recalc_ps(local, -1);
  569. if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
  570. sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
  571. /* XXX: for AP_VLAN, actually track AP queues */
  572. netif_tx_start_all_queues(dev);
  573. } else if (dev) {
  574. unsigned long flags;
  575. int n_acs = IEEE80211_NUM_ACS;
  576. int ac;
  577. if (local->hw.queues < IEEE80211_NUM_ACS)
  578. n_acs = 1;
  579. spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
  580. if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
  581. (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
  582. skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
  583. for (ac = 0; ac < n_acs; ac++) {
  584. int ac_queue = sdata->vif.hw_queue[ac];
  585. if (local->queue_stop_reasons[ac_queue] == 0 &&
  586. skb_queue_empty(&local->pending[ac_queue]))
  587. netif_start_subqueue(dev, ac);
  588. }
  589. }
  590. spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
  591. }
  592. return 0;
  593. err_del_interface:
  594. drv_remove_interface(local, sdata);
  595. err_stop:
  596. if (!local->open_count)
  597. drv_stop(local);
  598. err_del_bss:
  599. sdata->bss = NULL;
  600. if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
  601. list_del(&sdata->u.vlan.list);
  602. /* might already be clear but that doesn't matter */
  603. clear_bit(SDATA_STATE_RUNNING, &sdata->state);
  604. return res;
  605. }
  606. static int ieee80211_open(struct net_device *dev)
  607. {
  608. struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  609. int err;
  610. /* fail early if user set an invalid address */
  611. if (!is_valid_ether_addr(dev->dev_addr))
  612. return -EADDRNOTAVAIL;
  613. err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
  614. if (err)
  615. return err;
  616. return ieee80211_do_open(&sdata->wdev, true);
  617. }
  618. static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
  619. bool going_down)
  620. {
  621. struct ieee80211_local *local = sdata->local;
  622. unsigned long flags;
  623. struct sk_buff *skb, *tmp;
  624. u32 hw_reconf_flags = 0;
  625. int i, flushed;
  626. struct ps_data *ps;
  627. clear_bit(SDATA_STATE_RUNNING, &sdata->state);
  628. if (rcu_access_pointer(local->scan_sdata) == sdata)
  629. ieee80211_scan_cancel(local);
  630. /*
  631. * Stop TX on this interface first.
  632. */
  633. if (sdata->dev)
  634. netif_tx_stop_all_queues(sdata->dev);
  635. ieee80211_roc_purge(local, sdata);
  636. if (sdata->vif.type == NL80211_IFTYPE_STATION)
  637. ieee80211_mgd_stop(sdata);
  638. if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
  639. ieee80211_ibss_stop(sdata);
  640. /*
  641. * Remove all stations associated with this interface.
  642. *
  643. * This must be done before calling ops->remove_interface()
  644. * because otherwise we can later invoke ops->sta_notify()
  645. * whenever the STAs are removed, and that invalidates driver
  646. * assumptions about always getting a vif pointer that is valid
  647. * (because if we remove a STA after ops->remove_interface()
  648. * the driver will have removed the vif info already!)
  649. *
  650. * This is relevant only in WDS mode, in all other modes we've
  651. * already removed all stations when disconnecting or similar,
  652. * so warn otherwise.
  653. *
  654. * We call sta_info_flush_cleanup() later, to combine RCU waits.
  655. */
  656. flushed = sta_info_flush_defer(sdata);
  657. WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
  658. (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
  659. /* don't count this interface for promisc/allmulti while it is down */
  660. if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
  661. atomic_dec(&local->iff_allmultis);
  662. if (sdata->flags & IEEE80211_SDATA_PROMISC)
  663. atomic_dec(&local->iff_promiscs);
  664. if (sdata->vif.type == NL80211_IFTYPE_AP) {
  665. local->fif_pspoll--;
  666. local->fif_probe_req--;
  667. } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
  668. local->fif_probe_req--;
  669. }
  670. if (sdata->dev) {
  671. netif_addr_lock_bh(sdata->dev);
  672. spin_lock_bh(&local->filter_lock);
  673. __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
  674. sdata->dev->addr_len);
  675. spin_unlock_bh(&local->filter_lock);
  676. netif_addr_unlock_bh(sdata->dev);
  677. }
  678. del_timer_sync(&local->dynamic_ps_timer);
  679. cancel_work_sync(&local->dynamic_ps_enable_work);
  680. cancel_work_sync(&sdata->recalc_smps);
  681. sdata->vif.csa_active = false;
  682. cancel_work_sync(&sdata->csa_finalize_work);
  683. cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
  684. if (sdata->wdev.cac_started) {
  685. WARN_ON(local->suspended);
  686. mutex_lock(&local->iflist_mtx);
  687. ieee80211_vif_release_channel(sdata);
  688. mutex_unlock(&local->iflist_mtx);
  689. cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
  690. GFP_KERNEL);
  691. }
  692. /* APs need special treatment */
  693. if (sdata->vif.type == NL80211_IFTYPE_AP) {
  694. struct ieee80211_sub_if_data *vlan, *tmpsdata;
  695. /* down all dependent devices, that is VLANs */
  696. list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
  697. u.vlan.list)
  698. dev_close(vlan->dev);
  699. WARN_ON(!list_empty(&sdata->u.ap.vlans));
  700. } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
  701. /* remove all packets in parent bc_buf pointing to this dev */
  702. ps = &sdata->bss->ps;
  703. spin_lock_irqsave(&ps->bc_buf.lock, flags);
  704. skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
  705. if (skb->dev == sdata->dev) {
  706. __skb_unlink(skb, &ps->bc_buf);
  707. local->total_ps_buffered--;
  708. ieee80211_free_txskb(&local->hw, skb);
  709. }
  710. }
  711. spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
  712. }
  713. if (going_down)
  714. local->open_count--;
  715. switch (sdata->vif.type) {
  716. case NL80211_IFTYPE_AP_VLAN:
  717. list_del(&sdata->u.vlan.list);
  718. rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
  719. /* no need to tell driver */
  720. break;
  721. case NL80211_IFTYPE_MONITOR:
  722. if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
  723. local->cooked_mntrs--;
  724. break;
  725. }
  726. local->monitors--;
  727. if (local->monitors == 0) {
  728. local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
  729. hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
  730. }
  731. ieee80211_adjust_monitor_flags(sdata, -1);
  732. break;
  733. case NL80211_IFTYPE_P2P_DEVICE:
  734. /* relies on synchronize_rcu() below */
  735. rcu_assign_pointer(local->p2p_sdata, NULL);
  736. /* fall through */
  737. default:
  738. cancel_work_sync(&sdata->work);
  739. /*
  740. * When we get here, the interface is marked down.
  741. *
  742. * sta_info_flush_cleanup() requires rcu_barrier()
  743. * first to wait for the station call_rcu() calls
  744. * to complete, and we also need synchronize_rcu()
  745. * to wait for the RX path in case it is using the
  746. * interface and enqueuing frames at this very time on
  747. * another CPU.
  748. */
  749. synchronize_rcu();
  750. rcu_barrier();
  751. sta_info_flush_cleanup(sdata);
  752. /*
  753. * Free all remaining keys, there shouldn't be any,
  754. * except maybe in WDS mode?
  755. */
  756. ieee80211_free_keys(sdata);
  757. /* fall through */
  758. case NL80211_IFTYPE_AP:
  759. skb_queue_purge(&sdata->skb_queue);
  760. }
  761. sdata->bss = NULL;
  762. spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
  763. for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
  764. skb_queue_walk_safe(&local->pending[i], skb, tmp) {
  765. struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  766. if (info->control.vif == &sdata->vif) {
  767. __skb_unlink(skb, &local->pending[i]);
  768. ieee80211_free_txskb(&local->hw, skb);
  769. }
  770. }
  771. }
  772. spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
  773. if (local->open_count == 0)
  774. ieee80211_clear_tx_pending(local);
  775. /*
  776. * If the interface goes down while suspended, presumably because
  777. * the device was unplugged and that happens before our resume,
  778. * then the driver is already unconfigured and the remainder of
  779. * this function isn't needed.
  780. * XXX: what about WoWLAN? If the device has software state, e.g.
  781. * memory allocated, it might expect teardown commands from
  782. * mac80211 here?
  783. */
  784. if (local->suspended) {
  785. WARN_ON(local->wowlan);
  786. WARN_ON(rtnl_dereference(local->monitor_sdata));
  787. return;
  788. }
  789. switch (sdata->vif.type) {
  790. case NL80211_IFTYPE_AP_VLAN:
  791. break;
  792. case NL80211_IFTYPE_MONITOR:
  793. if (local->monitors == 0)
  794. ieee80211_del_virtual_monitor(local);
  795. mutex_lock(&local->mtx);
  796. ieee80211_recalc_idle(local);
  797. mutex_unlock(&local->mtx);
  798. if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
  799. break;
  800. /* fall through */
  801. default:
  802. if (going_down)
  803. drv_remove_interface(local, sdata);
  804. }
  805. ieee80211_recalc_ps(local, -1);
  806. if (local->open_count == 0) {
  807. ieee80211_stop_device(local);
  808. /* no reconfiguring after stop! */
  809. return;
  810. }
  811. /* do after stop to avoid reconfiguring when we stop anyway */
  812. ieee80211_configure_filter(local);
  813. ieee80211_hw_config(local, hw_reconf_flags);
  814. if (local->monitors == local->open_count)
  815. ieee80211_add_virtual_monitor(local);
  816. }
  817. static int ieee80211_stop(struct net_device *dev)
  818. {
  819. struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  820. ieee80211_do_stop(sdata, true);
  821. return 0;
  822. }
  823. static void ieee80211_set_multicast_list(struct net_device *dev)
  824. {
  825. struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  826. struct ieee80211_local *local = sdata->local;
  827. int allmulti, promisc, sdata_allmulti, sdata_promisc;
  828. allmulti = !!(dev->flags & IFF_ALLMULTI);
  829. promisc = !!(dev->flags & IFF_PROMISC);
  830. sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
  831. sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
  832. if (allmulti != sdata_allmulti) {
  833. if (dev->flags & IFF_ALLMULTI)
  834. atomic_inc(&local->iff_allmultis);
  835. else
  836. atomic_dec(&local->iff_allmultis);
  837. sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
  838. }
  839. if (promisc != sdata_promisc) {
  840. if (dev->flags & IFF_PROMISC)
  841. atomic_inc(&local->iff_promiscs);
  842. else
  843. atomic_dec(&local->iff_promiscs);
  844. sdata->flags ^= IEEE80211_SDATA_PROMISC;
  845. }
  846. /*
  847. * TODO: If somebody needs this on AP interfaces,
  848. * it can be enabled easily but multicast
  849. * addresses from VLANs need to be synced.
  850. */
  851. if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
  852. sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
  853. sdata->vif.type != NL80211_IFTYPE_AP)
  854. drv_set_multicast_list(local, sdata, &dev->mc);
  855. spin_lock_bh(&local->filter_lock);
  856. __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
  857. spin_unlock_bh(&local->filter_lock);
  858. ieee80211_queue_work(&local->hw, &local->reconfig_filter);
  859. }
  860. /*
  861. * Called when the netdev is removed or, by the code below, before
  862. * the interface type changes.
  863. */
  864. static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
  865. {
  866. int flushed;
  867. int i;
  868. /* free extra data */
  869. ieee80211_free_keys(sdata);
  870. ieee80211_debugfs_remove_netdev(sdata);
  871. for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
  872. __skb_queue_purge(&sdata->fragments[i].skb_list);
  873. sdata->fragment_next = 0;
  874. if (ieee80211_vif_is_mesh(&sdata->vif))
  875. mesh_rmc_free(sdata);
  876. flushed = sta_info_flush(sdata);
  877. WARN_ON(flushed);
  878. }
  879. static void ieee80211_uninit(struct net_device *dev)
  880. {
  881. ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
  882. }
  883. static u16 ieee80211_netdev_select_queue(struct net_device *dev,
  884. struct sk_buff *skb)
  885. {
  886. return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
  887. }
  888. static const struct net_device_ops ieee80211_dataif_ops = {
  889. .ndo_open = ieee80211_open,
  890. .ndo_stop = ieee80211_stop,
  891. .ndo_uninit = ieee80211_uninit,
  892. .ndo_start_xmit = ieee80211_subif_start_xmit,
  893. .ndo_set_rx_mode = ieee80211_set_multicast_list,
  894. .ndo_change_mtu = ieee80211_change_mtu,
  895. .ndo_set_mac_address = ieee80211_change_mac,
  896. .ndo_select_queue = ieee80211_netdev_select_queue,
  897. };
  898. static u16 ieee80211_monitor_select_queue(struct net_device *dev,
  899. struct sk_buff *skb)
  900. {
  901. struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  902. struct ieee80211_local *local = sdata->local;
  903. struct ieee80211_hdr *hdr;
  904. struct ieee80211_radiotap_header *rtap = (void *)skb->data;
  905. if (local->hw.queues < IEEE80211_NUM_ACS)
  906. return 0;
  907. if (skb->len < 4 ||
  908. skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
  909. return 0; /* doesn't matter, frame will be dropped */
  910. hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
  911. return ieee80211_select_queue_80211(sdata, skb, hdr);
  912. }
  913. static const struct net_device_ops ieee80211_monitorif_ops = {
  914. .ndo_open = ieee80211_open,
  915. .ndo_stop = ieee80211_stop,
  916. .ndo_uninit = ieee80211_uninit,
  917. .ndo_start_xmit = ieee80211_monitor_start_xmit,
  918. .ndo_set_rx_mode = ieee80211_set_multicast_list,
  919. .ndo_change_mtu = ieee80211_change_mtu,
  920. .ndo_set_mac_address = ieee80211_change_mac,
  921. .ndo_select_queue = ieee80211_monitor_select_queue,
  922. };
  923. static void ieee80211_if_setup(struct net_device *dev)
  924. {
  925. ether_setup(dev);
  926. dev->priv_flags &= ~IFF_TX_SKB_SHARING;
  927. dev->netdev_ops = &ieee80211_dataif_ops;
  928. dev->destructor = free_netdev;
  929. }
  930. static void ieee80211_iface_work(struct work_struct *work)
  931. {
  932. struct ieee80211_sub_if_data *sdata =
  933. container_of(work, struct ieee80211_sub_if_data, work);
  934. struct ieee80211_local *local = sdata->local;
  935. struct sk_buff *skb;
  936. struct sta_info *sta;
  937. struct ieee80211_ra_tid *ra_tid;
  938. if (!ieee80211_sdata_running(sdata))
  939. return;
  940. if (local->scanning)
  941. return;
  942. /*
  943. * ieee80211_queue_work() should have picked up most cases,
  944. * here we'll pick the rest.
  945. */
  946. if (WARN(local->suspended,
  947. "interface work scheduled while going to suspend\n"))
  948. return;
  949. /* first process frames */
  950. while ((skb = skb_dequeue(&sdata->skb_queue))) {
  951. struct ieee80211_mgmt *mgmt = (void *)skb->data;
  952. if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
  953. ra_tid = (void *)&skb->cb;
  954. ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
  955. ra_tid->tid);
  956. } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
  957. ra_tid = (void *)&skb->cb;
  958. ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
  959. ra_tid->tid);
  960. } else if (ieee80211_is_action(mgmt->frame_control) &&
  961. mgmt->u.action.category == WLAN_CATEGORY_BACK) {
  962. int len = skb->len;
  963. mutex_lock(&local->sta_mtx);
  964. sta = sta_info_get_bss(sdata, mgmt->sa);
  965. if (sta) {
  966. switch (mgmt->u.action.u.addba_req.action_code) {
  967. case WLAN_ACTION_ADDBA_REQ:
  968. ieee80211_process_addba_request(
  969. local, sta, mgmt, len);
  970. break;
  971. case WLAN_ACTION_ADDBA_RESP:
  972. ieee80211_process_addba_resp(local, sta,
  973. mgmt, len);
  974. break;
  975. case WLAN_ACTION_DELBA:
  976. ieee80211_process_delba(sdata, sta,
  977. mgmt, len);
  978. break;
  979. default:
  980. WARN_ON(1);
  981. break;
  982. }
  983. }
  984. mutex_unlock(&local->sta_mtx);
  985. } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
  986. struct ieee80211_hdr *hdr = (void *)mgmt;
  987. /*
  988. * So the frame isn't mgmt, but frame_control
  989. * is at the right place anyway, of course, so
  990. * the if statement is correct.
  991. *
  992. * Warn if we have other data frame types here,
  993. * they must not get here.
  994. */
  995. WARN_ON(hdr->frame_control &
  996. cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
  997. WARN_ON(!(hdr->seq_ctrl &
  998. cpu_to_le16(IEEE80211_SCTL_FRAG)));
  999. /*
  1000. * This was a fragment of a frame, received while
  1001. * a block-ack session was active. That cannot be
  1002. * right, so terminate the session.
  1003. */
  1004. mutex_lock(&local->sta_mtx);
  1005. sta = sta_info_get_bss(sdata, mgmt->sa);
  1006. if (sta) {
  1007. u16 tid = *ieee80211_get_qos_ctl(hdr) &
  1008. IEEE80211_QOS_CTL_TID_MASK;
  1009. __ieee80211_stop_rx_ba_session(
  1010. sta, tid, WLAN_BACK_RECIPIENT,
  1011. WLAN_REASON_QSTA_REQUIRE_SETUP,
  1012. true);
  1013. }
  1014. mutex_unlock(&local->sta_mtx);
  1015. } else switch (sdata->vif.type) {
  1016. case NL80211_IFTYPE_STATION:
  1017. ieee80211_sta_rx_queued_mgmt(sdata, skb);
  1018. break;
  1019. case NL80211_IFTYPE_ADHOC:
  1020. ieee80211_ibss_rx_queued_mgmt(sdata, skb);
  1021. break;
  1022. case NL80211_IFTYPE_MESH_POINT:
  1023. if (!ieee80211_vif_is_mesh(&sdata->vif))
  1024. break;
  1025. ieee80211_mesh_rx_queued_mgmt(sdata, skb);
  1026. break;
  1027. default:
  1028. WARN(1, "frame for unexpected interface type");
  1029. break;
  1030. }
  1031. kfree_skb(skb);
  1032. }
  1033. /* then other type-dependent work */
  1034. switch (sdata->vif.type) {
  1035. case NL80211_IFTYPE_STATION:
  1036. ieee80211_sta_work(sdata);
  1037. break;
  1038. case NL80211_IFTYPE_ADHOC:
  1039. ieee80211_ibss_work(sdata);
  1040. break;
  1041. case NL80211_IFTYPE_MESH_POINT:
  1042. if (!ieee80211_vif_is_mesh(&sdata->vif))
  1043. break;
  1044. ieee80211_mesh_work(sdata);
  1045. break;
  1046. default:
  1047. break;
  1048. }
  1049. }
  1050. static void ieee80211_recalc_smps_work(struct work_struct *work)
  1051. {
  1052. struct ieee80211_sub_if_data *sdata =
  1053. container_of(work, struct ieee80211_sub_if_data, recalc_smps);
  1054. ieee80211_recalc_smps(sdata);
  1055. }
  1056. /*
  1057. * Helper function to initialise an interface to a specific type.
  1058. */
  1059. static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
  1060. enum nl80211_iftype type)
  1061. {
  1062. /* clear type-dependent union */
  1063. memset(&sdata->u, 0, sizeof(sdata->u));
  1064. /* and set some type-dependent values */
  1065. sdata->vif.type = type;
  1066. sdata->vif.p2p = false;
  1067. sdata->wdev.iftype = type;
  1068. sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
  1069. sdata->control_port_no_encrypt = false;
  1070. sdata->noack_map = 0;
  1071. /* only monitor/p2p-device differ */
  1072. if (sdata->dev) {
  1073. sdata->dev->netdev_ops = &ieee80211_dataif_ops;
  1074. sdata->dev->type = ARPHRD_ETHER;
  1075. }
  1076. skb_queue_head_init(&sdata->skb_queue);
  1077. INIT_WORK(&sdata->work, ieee80211_iface_work);
  1078. INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
  1079. INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
  1080. switch (type) {
  1081. case NL80211_IFTYPE_P2P_GO:
  1082. type = NL80211_IFTYPE_AP;
  1083. sdata->vif.type = type;
  1084. sdata->vif.p2p = true;
  1085. /* fall through */
  1086. case NL80211_IFTYPE_AP:
  1087. skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
  1088. INIT_LIST_HEAD(&sdata->u.ap.vlans);
  1089. sdata->vif.bss_conf.bssid = sdata->vif.addr;
  1090. break;
  1091. case NL80211_IFTYPE_P2P_CLIENT:
  1092. type = NL80211_IFTYPE_STATION;
  1093. sdata->vif.type = type;
  1094. sdata->vif.p2p = true;
  1095. /* fall through */
  1096. case NL80211_IFTYPE_STATION:
  1097. sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
  1098. ieee80211_sta_setup_sdata(sdata);
  1099. break;
  1100. case NL80211_IFTYPE_ADHOC:
  1101. sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
  1102. ieee80211_ibss_setup_sdata(sdata);
  1103. break;
  1104. case NL80211_IFTYPE_MESH_POINT:
  1105. if (ieee80211_vif_is_mesh(&sdata->vif))
  1106. ieee80211_mesh_init_sdata(sdata);
  1107. break;
  1108. case NL80211_IFTYPE_MONITOR:
  1109. sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
  1110. sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
  1111. sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
  1112. MONITOR_FLAG_OTHER_BSS;
  1113. break;
  1114. case NL80211_IFTYPE_WDS:
  1115. sdata->vif.bss_conf.bssid = NULL;
  1116. break;
  1117. case NL80211_IFTYPE_AP_VLAN:
  1118. break;
  1119. case NL80211_IFTYPE_P2P_DEVICE:
  1120. sdata->vif.bss_conf.bssid = sdata->vif.addr;
  1121. break;
  1122. case NL80211_IFTYPE_UNSPECIFIED:
  1123. case NUM_NL80211_IFTYPES:
  1124. BUG();
  1125. break;
  1126. }
  1127. ieee80211_debugfs_add_netdev(sdata);
  1128. }
  1129. static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
  1130. enum nl80211_iftype type)
  1131. {
  1132. struct ieee80211_local *local = sdata->local;
  1133. int ret, err;
  1134. enum nl80211_iftype internal_type = type;
  1135. bool p2p = false;
  1136. ASSERT_RTNL();
  1137. if (!local->ops->change_interface)
  1138. return -EBUSY;
  1139. switch (sdata->vif.type) {
  1140. case NL80211_IFTYPE_AP:
  1141. case NL80211_IFTYPE_STATION:
  1142. case NL80211_IFTYPE_ADHOC:
  1143. /*
  1144. * Could maybe also all others here?
  1145. * Just not sure how that interacts
  1146. * with the RX/config path e.g. for
  1147. * mesh.
  1148. */
  1149. break;
  1150. default:
  1151. return -EBUSY;
  1152. }
  1153. switch (type) {
  1154. case NL80211_IFTYPE_AP:
  1155. case NL80211_IFTYPE_STATION:
  1156. case NL80211_IFTYPE_ADHOC:
  1157. /*
  1158. * Could probably support everything
  1159. * but WDS here (WDS do_open can fail
  1160. * under memory pressure, which this
  1161. * code isn't prepared to handle).
  1162. */
  1163. break;
  1164. case NL80211_IFTYPE_P2P_CLIENT:
  1165. p2p = true;
  1166. internal_type = NL80211_IFTYPE_STATION;
  1167. break;
  1168. case NL80211_IFTYPE_P2P_GO:
  1169. p2p = true;
  1170. internal_type = NL80211_IFTYPE_AP;
  1171. break;
  1172. default:
  1173. return -EBUSY;
  1174. }
  1175. ret = ieee80211_check_concurrent_iface(sdata, internal_type);
  1176. if (ret)
  1177. return ret;
  1178. ieee80211_do_stop(sdata, false);
  1179. ieee80211_teardown_sdata(sdata);
  1180. ret = drv_change_interface(local, sdata, internal_type, p2p);
  1181. if (ret)
  1182. type = ieee80211_vif_type_p2p(&sdata->vif);
  1183. /*
  1184. * Ignore return value here, there's not much we can do since
  1185. * the driver changed the interface type internally already.
  1186. * The warnings will hopefully make driver authors fix it :-)
  1187. */
  1188. ieee80211_check_queues(sdata, type);
  1189. ieee80211_setup_sdata(sdata, type);
  1190. err = ieee80211_do_open(&sdata->wdev, false);
  1191. WARN(err, "type change: do_open returned %d", err);
  1192. return ret;
  1193. }
  1194. int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
  1195. enum nl80211_iftype type)
  1196. {
  1197. int ret;
  1198. ASSERT_RTNL();
  1199. if (type == ieee80211_vif_type_p2p(&sdata->vif))
  1200. return 0;
  1201. if (ieee80211_sdata_running(sdata)) {
  1202. ret = ieee80211_runtime_change_iftype(sdata, type);
  1203. if (ret)
  1204. return ret;
  1205. } else {
  1206. /* Purge and reset type-dependent state. */
  1207. ieee80211_teardown_sdata(sdata);
  1208. ieee80211_setup_sdata(sdata, type);
  1209. }
  1210. /* reset some values that shouldn't be kept across type changes */
  1211. sdata->drop_unencrypted = 0;
  1212. if (type == NL80211_IFTYPE_STATION)
  1213. sdata->u.mgd.use_4addr = false;
  1214. return 0;
  1215. }
  1216. static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
  1217. u8 *perm_addr, enum nl80211_iftype type)
  1218. {
  1219. struct ieee80211_sub_if_data *sdata;
  1220. u64 mask, start, addr, val, inc;
  1221. u8 *m;
  1222. u8 tmp_addr[ETH_ALEN];
  1223. int i;
  1224. /* default ... something at least */
  1225. memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
  1226. if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
  1227. local->hw.wiphy->n_addresses <= 1)
  1228. return;
  1229. mutex_lock(&local->iflist_mtx);
  1230. switch (type) {
  1231. case NL80211_IFTYPE_MONITOR:
  1232. /* doesn't matter */
  1233. break;
  1234. case NL80211_IFTYPE_WDS:
  1235. case NL80211_IFTYPE_AP_VLAN:
  1236. /* match up with an AP interface */
  1237. list_for_each_entry(sdata, &local->interfaces, list) {
  1238. if (sdata->vif.type != NL80211_IFTYPE_AP)
  1239. continue;
  1240. memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
  1241. break;
  1242. }
  1243. /* keep default if no AP interface present */
  1244. break;
  1245. case NL80211_IFTYPE_P2P_CLIENT:
  1246. case NL80211_IFTYPE_P2P_GO:
  1247. if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
  1248. list_for_each_entry(sdata, &local->interfaces, list) {
  1249. if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
  1250. continue;
  1251. if (!ieee80211_sdata_running(sdata))
  1252. continue;
  1253. memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
  1254. goto out_unlock;
  1255. }
  1256. }
  1257. /* otherwise fall through */
  1258. default:
  1259. /* assign a new address if possible -- try n_addresses first */
  1260. for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
  1261. bool used = false;
  1262. list_for_each_entry(sdata, &local->interfaces, list) {
  1263. if (memcmp(local->hw.wiphy->addresses[i].addr,
  1264. sdata->vif.addr, ETH_ALEN) == 0) {
  1265. used = true;
  1266. break;
  1267. }
  1268. }
  1269. if (!used) {
  1270. memcpy(perm_addr,
  1271. local->hw.wiphy->addresses[i].addr,
  1272. ETH_ALEN);
  1273. break;
  1274. }
  1275. }
  1276. /* try mask if available */
  1277. if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
  1278. break;
  1279. m = local->hw.wiphy->addr_mask;
  1280. mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
  1281. ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
  1282. ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
  1283. if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
  1284. /* not a contiguous mask ... not handled now! */
  1285. pr_info("not contiguous\n");
  1286. break;
  1287. }
  1288. /*
  1289. * Pick address of existing interface in case user changed
  1290. * MAC address manually, default to perm_addr.
  1291. */
  1292. m = local->hw.wiphy->perm_addr;
  1293. list_for_each_entry(sdata, &local->interfaces, list) {
  1294. if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
  1295. continue;
  1296. m = sdata->vif.addr;
  1297. break;
  1298. }
  1299. start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
  1300. ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
  1301. ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
  1302. inc = 1ULL<<__ffs64(mask);
  1303. val = (start & mask);
  1304. addr = (start & ~mask) | (val & mask);
  1305. do {
  1306. bool used = false;
  1307. tmp_addr[5] = addr >> 0*8;
  1308. tmp_addr[4] = addr >> 1*8;
  1309. tmp_addr[3] = addr >> 2*8;
  1310. tmp_addr[2] = addr >> 3*8;
  1311. tmp_addr[1] = addr >> 4*8;
  1312. tmp_addr[0] = addr >> 5*8;
  1313. val += inc;
  1314. list_for_each_entry(sdata, &local->interfaces, list) {
  1315. if (memcmp(tmp_addr, sdata->vif.addr,
  1316. ETH_ALEN) == 0) {
  1317. used = true;
  1318. break;
  1319. }
  1320. }
  1321. if (!used) {
  1322. memcpy(perm_addr, tmp_addr, ETH_ALEN);
  1323. break;
  1324. }
  1325. addr = (start & ~mask) | (val & mask);
  1326. } while (addr != start);
  1327. break;
  1328. }
  1329. out_unlock:
  1330. mutex_unlock(&local->iflist_mtx);
  1331. }
  1332. static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
  1333. {
  1334. struct ieee80211_sub_if_data *sdata;
  1335. sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
  1336. ieee80211_cleanup_sdata_stas(sdata);
  1337. }
  1338. int ieee80211_if_add(struct ieee80211_local *local, const char *name,
  1339. struct wireless_dev **new_wdev, enum nl80211_iftype type,
  1340. struct vif_params *params)
  1341. {
  1342. struct net_device *ndev = NULL;
  1343. struct ieee80211_sub_if_data *sdata = NULL;
  1344. int ret, i;
  1345. int txqs = 1;
  1346. ASSERT_RTNL();
  1347. if (type == NL80211_IFTYPE_P2P_DEVICE) {
  1348. struct wireless_dev *wdev;
  1349. sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
  1350. GFP_KERNEL);
  1351. if (!sdata)
  1352. return -ENOMEM;
  1353. wdev = &sdata->wdev;
  1354. sdata->dev = NULL;
  1355. strlcpy(sdata->name, name, IFNAMSIZ);
  1356. ieee80211_assign_perm_addr(local, wdev->address, type);
  1357. memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
  1358. } else {
  1359. if (local->hw.queues >= IEEE80211_NUM_ACS)
  1360. txqs = IEEE80211_NUM_ACS;
  1361. ndev = alloc_netdev_mqs(sizeof(*sdata) +
  1362. local->hw.vif_data_size,
  1363. name, ieee80211_if_setup, txqs, 1);
  1364. if (!ndev)
  1365. return -ENOMEM;
  1366. dev_net_set(ndev, wiphy_net(local->hw.wiphy));
  1367. ndev->needed_headroom = local->tx_headroom +
  1368. 4*6 /* four MAC addresses */
  1369. + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
  1370. + 6 /* mesh */
  1371. + 8 /* rfc1042/bridge tunnel */
  1372. - ETH_HLEN /* ethernet hard_header_len */
  1373. + IEEE80211_ENCRYPT_HEADROOM;
  1374. ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
  1375. ret = dev_alloc_name(ndev, ndev->name);
  1376. if (ret < 0) {
  1377. free_netdev(ndev);
  1378. return ret;
  1379. }
  1380. ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
  1381. memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
  1382. SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
  1383. /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
  1384. sdata = netdev_priv(ndev);
  1385. ndev->ieee80211_ptr = &sdata->wdev;
  1386. memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
  1387. memcpy(sdata->name, ndev->name, IFNAMSIZ);
  1388. sdata->dev = ndev;
  1389. }
  1390. /* initialise type-independent data */
  1391. sdata->wdev.wiphy = local->hw.wiphy;
  1392. sdata->local = local;
  1393. for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
  1394. skb_queue_head_init(&sdata->fragments[i].skb_list);
  1395. INIT_LIST_HEAD(&sdata->key_list);
  1396. spin_lock_init(&sdata->cleanup_stations_lock);
  1397. INIT_LIST_HEAD(&sdata->cleanup_stations);
  1398. INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
  1399. INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
  1400. ieee80211_dfs_cac_timer_work);
  1401. INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
  1402. ieee80211_delayed_tailroom_dec);
  1403. for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
  1404. struct ieee80211_supported_band *sband;
  1405. sband = local->hw.wiphy->bands[i];
  1406. sdata->rc_rateidx_mask[i] =
  1407. sband ? (1 << sband->n_bitrates) - 1 : 0;
  1408. if (sband)
  1409. memcpy(sdata->rc_rateidx_mcs_mask[i],
  1410. sband->ht_cap.mcs.rx_mask,
  1411. sizeof(sdata->rc_rateidx_mcs_mask[i]));
  1412. else
  1413. memset(sdata->rc_rateidx_mcs_mask[i], 0,
  1414. sizeof(sdata->rc_rateidx_mcs_mask[i]));
  1415. }
  1416. ieee80211_set_default_queues(sdata);
  1417. sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
  1418. sdata->user_power_level = local->user_power_level;
  1419. /* setup type-dependent data */
  1420. ieee80211_setup_sdata(sdata, type);
  1421. if (ndev) {
  1422. if (params) {
  1423. ndev->ieee80211_ptr->use_4addr = params->use_4addr;
  1424. if (type == NL80211_IFTYPE_STATION)
  1425. sdata->u.mgd.use_4addr = params->use_4addr;
  1426. }
  1427. ndev->features |= local->hw.netdev_features;
  1428. ret = register_netdevice(ndev);
  1429. if (ret) {
  1430. free_netdev(ndev);
  1431. return ret;
  1432. }
  1433. }
  1434. mutex_lock(&local->iflist_mtx);
  1435. list_add_tail_rcu(&sdata->list, &local->interfaces);
  1436. mutex_unlock(&local->iflist_mtx);
  1437. if (new_wdev)
  1438. *new_wdev = &sdata->wdev;
  1439. return 0;
  1440. }
  1441. void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
  1442. {
  1443. ASSERT_RTNL();
  1444. mutex_lock(&sdata->local->iflist_mtx);
  1445. list_del_rcu(&sdata->list);
  1446. mutex_unlock(&sdata->local->iflist_mtx);
  1447. synchronize_rcu();
  1448. if (sdata->dev) {
  1449. unregister_netdevice(sdata->dev);
  1450. } else {
  1451. cfg80211_unregister_wdev(&sdata->wdev);
  1452. kfree(sdata);
  1453. }
  1454. }
  1455. void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
  1456. {
  1457. if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
  1458. return;
  1459. ieee80211_do_stop(sdata, true);
  1460. ieee80211_teardown_sdata(sdata);
  1461. }
  1462. /*
  1463. * Remove all interfaces, may only be called at hardware unregistration
  1464. * time because it doesn't do RCU-safe list removals.
  1465. */
  1466. void ieee80211_remove_interfaces(struct ieee80211_local *local)
  1467. {
  1468. struct ieee80211_sub_if_data *sdata, *tmp;
  1469. LIST_HEAD(unreg_list);
  1470. LIST_HEAD(wdev_list);
  1471. ASSERT_RTNL();
  1472. /*
  1473. * Close all AP_VLAN interfaces first, as otherwise they
  1474. * might be closed while the AP interface they belong to
  1475. * is closed, causing unregister_netdevice_many() to crash.
  1476. */
  1477. list_for_each_entry(sdata, &local->interfaces, list)
  1478. if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
  1479. dev_close(sdata->dev);
  1480. mutex_lock(&local->iflist_mtx);
  1481. list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
  1482. list_del(&sdata->list);
  1483. if (sdata->dev)
  1484. unregister_netdevice_queue(sdata->dev, &unreg_list);
  1485. else
  1486. list_add(&sdata->list, &wdev_list);
  1487. }
  1488. mutex_unlock(&local->iflist_mtx);
  1489. unregister_netdevice_many(&unreg_list);
  1490. list_del(&unreg_list);
  1491. list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
  1492. list_del(&sdata->list);
  1493. cfg80211_unregister_wdev(&sdata->wdev);
  1494. kfree(sdata);
  1495. }
  1496. }
  1497. static int netdev_notify(struct notifier_block *nb,
  1498. unsigned long state, void *ptr)
  1499. {
  1500. struct net_device *dev = netdev_notifier_info_to_dev(ptr);
  1501. struct ieee80211_sub_if_data *sdata;
  1502. if (state != NETDEV_CHANGENAME)
  1503. return 0;
  1504. if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
  1505. return 0;
  1506. if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
  1507. return 0;
  1508. sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  1509. memcpy(sdata->name, dev->name, IFNAMSIZ);
  1510. ieee80211_debugfs_rename_netdev(sdata);
  1511. return 0;
  1512. }
  1513. static struct notifier_block mac80211_netdev_notifier = {
  1514. .notifier_call = netdev_notify,
  1515. };
  1516. int ieee80211_iface_init(void)
  1517. {
  1518. return register_netdevice_notifier(&mac80211_netdev_notifier);
  1519. }
  1520. void ieee80211_iface_exit(void)
  1521. {
  1522. unregister_netdevice_notifier(&mac80211_netdev_notifier);
  1523. }