1 /*
2 * Copyright (c) 2008, 2009 open80211s Ltd.
3 * Authors: Luis Carlos Cobo <luisca@cozybit.com>
4 * Javier Cardona <javier@cozybit.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #include <linux/slab.h>
12 #include <asm/unaligned.h>
13 #include "ieee80211_i.h"
14 #include "mesh.h"
15 #include "driver-ops.h"
16
17 static int mesh_allocated;
18 static struct kmem_cache *rm_cache;
19
mesh_action_is_path_sel(struct ieee80211_mgmt * mgmt)20 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
21 {
22 return (mgmt->u.action.u.mesh_action.action_code ==
23 WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
24 }
25
ieee80211s_init(void)26 void ieee80211s_init(void)
27 {
28 mesh_allocated = 1;
29 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
30 0, 0, NULL);
31 }
32
ieee80211s_stop(void)33 void ieee80211s_stop(void)
34 {
35 if (!mesh_allocated)
36 return;
37 kmem_cache_destroy(rm_cache);
38 }
39
ieee80211_mesh_housekeeping_timer(struct timer_list * t)40 static void ieee80211_mesh_housekeeping_timer(struct timer_list *t)
41 {
42 struct ieee80211_sub_if_data *sdata =
43 from_timer(sdata, t, u.mesh.housekeeping_timer);
44 struct ieee80211_local *local = sdata->local;
45 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
46
47 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
48
49 ieee80211_queue_work(&local->hw, &sdata->work);
50 }
51
52 /**
53 * mesh_matches_local - check if the config of a mesh point matches ours
54 *
55 * @sdata: local mesh subif
56 * @ie: information elements of a management frame from the mesh peer
57 *
58 * This function checks if the mesh configuration of a mesh point matches the
59 * local mesh configuration, i.e. if both nodes belong to the same mesh network.
60 */
mesh_matches_local(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * ie)61 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
62 struct ieee802_11_elems *ie)
63 {
64 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
65 u32 basic_rates = 0;
66 struct cfg80211_chan_def sta_chan_def;
67 struct ieee80211_supported_band *sband;
68
69 /*
70 * As support for each feature is added, check for matching
71 * - On mesh config capabilities
72 * - Power Save Support En
73 * - Sync support enabled
74 * - Sync support active
75 * - Sync support required from peer
76 * - MDA enabled
77 * - Power management control on fc
78 */
79 if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
80 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
81 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
82 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
83 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
84 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
85 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
86 return false;
87
88 sband = ieee80211_get_sband(sdata);
89 if (!sband)
90 return false;
91
92 ieee80211_sta_get_rates(sdata, ie, sband->band,
93 &basic_rates);
94
95 if (sdata->vif.bss_conf.basic_rates != basic_rates)
96 return false;
97
98 cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
99 NL80211_CHAN_NO_HT);
100 ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
101 ieee80211_chandef_vht_oper(ie->vht_operation, &sta_chan_def);
102
103 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
104 &sta_chan_def))
105 return false;
106
107 return true;
108 }
109
110 /**
111 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
112 *
113 * @ie: information elements of a management frame from the mesh peer
114 */
mesh_peer_accepts_plinks(struct ieee802_11_elems * ie)115 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
116 {
117 return (ie->mesh_config->meshconf_cap &
118 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
119 }
120
121 /**
122 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
123 *
124 * @sdata: mesh interface in which mesh beacons are going to be updated
125 *
126 * Returns: beacon changed flag if the beacon content changed.
127 */
mesh_accept_plinks_update(struct ieee80211_sub_if_data * sdata)128 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
129 {
130 bool free_plinks;
131 u32 changed = 0;
132
133 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
134 * the mesh interface might be able to establish plinks with peers that
135 * are already on the table but are not on PLINK_ESTAB state. However,
136 * in general the mesh interface is not accepting peer link requests
137 * from new peers, and that must be reflected in the beacon
138 */
139 free_plinks = mesh_plink_availables(sdata);
140
141 if (free_plinks != sdata->u.mesh.accepting_plinks) {
142 sdata->u.mesh.accepting_plinks = free_plinks;
143 changed = BSS_CHANGED_BEACON;
144 }
145
146 return changed;
147 }
148
149 /*
150 * mesh_sta_cleanup - clean up any mesh sta state
151 *
152 * @sta: mesh sta to clean up.
153 */
mesh_sta_cleanup(struct sta_info * sta)154 void mesh_sta_cleanup(struct sta_info *sta)
155 {
156 struct ieee80211_sub_if_data *sdata = sta->sdata;
157 u32 changed = mesh_plink_deactivate(sta);
158
159 if (changed)
160 ieee80211_mbss_info_change_notify(sdata, changed);
161 }
162
mesh_rmc_init(struct ieee80211_sub_if_data * sdata)163 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
164 {
165 int i;
166
167 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
168 if (!sdata->u.mesh.rmc)
169 return -ENOMEM;
170 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
171 for (i = 0; i < RMC_BUCKETS; i++)
172 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
173 return 0;
174 }
175
mesh_rmc_free(struct ieee80211_sub_if_data * sdata)176 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
177 {
178 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
179 struct rmc_entry *p;
180 struct hlist_node *n;
181 int i;
182
183 if (!sdata->u.mesh.rmc)
184 return;
185
186 for (i = 0; i < RMC_BUCKETS; i++) {
187 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
188 hlist_del(&p->list);
189 kmem_cache_free(rm_cache, p);
190 }
191 }
192
193 kfree(rmc);
194 sdata->u.mesh.rmc = NULL;
195 }
196
197 /**
198 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
199 *
200 * @sdata: interface
201 * @sa: source address
202 * @mesh_hdr: mesh_header
203 *
204 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
205 *
206 * Checks using the source address and the mesh sequence number if we have
207 * received this frame lately. If the frame is not in the cache, it is added to
208 * it.
209 */
mesh_rmc_check(struct ieee80211_sub_if_data * sdata,const u8 * sa,struct ieee80211s_hdr * mesh_hdr)210 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
211 const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
212 {
213 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
214 u32 seqnum = 0;
215 int entries = 0;
216 u8 idx;
217 struct rmc_entry *p;
218 struct hlist_node *n;
219
220 if (!rmc)
221 return -1;
222
223 /* Don't care about endianness since only match matters */
224 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
225 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
226 hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
227 ++entries;
228 if (time_after(jiffies, p->exp_time) ||
229 entries == RMC_QUEUE_MAX_LEN) {
230 hlist_del(&p->list);
231 kmem_cache_free(rm_cache, p);
232 --entries;
233 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
234 return -1;
235 }
236
237 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
238 if (!p)
239 return 0;
240
241 p->seqnum = seqnum;
242 p->exp_time = jiffies + RMC_TIMEOUT;
243 memcpy(p->sa, sa, ETH_ALEN);
244 hlist_add_head(&p->list, &rmc->bucket[idx]);
245 return 0;
246 }
247
mesh_add_meshconf_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)248 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
249 struct sk_buff *skb)
250 {
251 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
252 u8 *pos, neighbors;
253 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
254
255 if (skb_tailroom(skb) < 2 + meshconf_len)
256 return -ENOMEM;
257
258 pos = skb_put(skb, 2 + meshconf_len);
259 *pos++ = WLAN_EID_MESH_CONFIG;
260 *pos++ = meshconf_len;
261
262 /* save a pointer for quick updates in pre-tbtt */
263 ifmsh->meshconf_offset = pos - skb->data;
264
265 /* Active path selection protocol ID */
266 *pos++ = ifmsh->mesh_pp_id;
267 /* Active path selection metric ID */
268 *pos++ = ifmsh->mesh_pm_id;
269 /* Congestion control mode identifier */
270 *pos++ = ifmsh->mesh_cc_id;
271 /* Synchronization protocol identifier */
272 *pos++ = ifmsh->mesh_sp_id;
273 /* Authentication Protocol identifier */
274 *pos++ = ifmsh->mesh_auth_id;
275 /* Mesh Formation Info - number of neighbors */
276 neighbors = atomic_read(&ifmsh->estab_plinks);
277 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
278 *pos++ = neighbors << 1;
279 /* Mesh capability */
280 *pos = 0x00;
281 *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
282 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
283 *pos |= ifmsh->accepting_plinks ?
284 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
285 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
286 *pos |= ifmsh->ps_peers_deep_sleep ?
287 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
288 return 0;
289 }
290
mesh_add_meshid_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)291 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
292 {
293 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
294 u8 *pos;
295
296 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
297 return -ENOMEM;
298
299 pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
300 *pos++ = WLAN_EID_MESH_ID;
301 *pos++ = ifmsh->mesh_id_len;
302 if (ifmsh->mesh_id_len)
303 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
304
305 return 0;
306 }
307
mesh_add_awake_window_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)308 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
309 struct sk_buff *skb)
310 {
311 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
312 u8 *pos;
313
314 /* see IEEE802.11-2012 13.14.6 */
315 if (ifmsh->ps_peers_light_sleep == 0 &&
316 ifmsh->ps_peers_deep_sleep == 0 &&
317 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
318 return 0;
319
320 if (skb_tailroom(skb) < 4)
321 return -ENOMEM;
322
323 pos = skb_put(skb, 2 + 2);
324 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
325 *pos++ = 2;
326 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
327
328 return 0;
329 }
330
mesh_add_vendor_ies(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)331 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
332 struct sk_buff *skb)
333 {
334 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
335 u8 offset, len;
336 const u8 *data;
337
338 if (!ifmsh->ie || !ifmsh->ie_len)
339 return 0;
340
341 /* fast-forward to vendor IEs */
342 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
343
344 if (offset < ifmsh->ie_len) {
345 len = ifmsh->ie_len - offset;
346 data = ifmsh->ie + offset;
347 if (skb_tailroom(skb) < len)
348 return -ENOMEM;
349 skb_put_data(skb, data, len);
350 }
351
352 return 0;
353 }
354
mesh_add_rsn_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)355 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
356 {
357 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
358 u8 len = 0;
359 const u8 *data;
360
361 if (!ifmsh->ie || !ifmsh->ie_len)
362 return 0;
363
364 /* find RSN IE */
365 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
366 if (!data)
367 return 0;
368
369 len = data[1] + 2;
370
371 if (skb_tailroom(skb) < len)
372 return -ENOMEM;
373 skb_put_data(skb, data, len);
374
375 return 0;
376 }
377
mesh_add_ds_params_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)378 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
379 struct sk_buff *skb)
380 {
381 struct ieee80211_chanctx_conf *chanctx_conf;
382 struct ieee80211_channel *chan;
383 u8 *pos;
384
385 if (skb_tailroom(skb) < 3)
386 return -ENOMEM;
387
388 rcu_read_lock();
389 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
390 if (WARN_ON(!chanctx_conf)) {
391 rcu_read_unlock();
392 return -EINVAL;
393 }
394 chan = chanctx_conf->def.chan;
395 rcu_read_unlock();
396
397 pos = skb_put(skb, 2 + 1);
398 *pos++ = WLAN_EID_DS_PARAMS;
399 *pos++ = 1;
400 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
401
402 return 0;
403 }
404
mesh_add_ht_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)405 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
406 struct sk_buff *skb)
407 {
408 struct ieee80211_supported_band *sband;
409 u8 *pos;
410
411 sband = ieee80211_get_sband(sdata);
412 if (!sband)
413 return -EINVAL;
414
415 if (!sband->ht_cap.ht_supported ||
416 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
417 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
418 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
419 return 0;
420
421 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
422 return -ENOMEM;
423
424 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
425 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
426
427 return 0;
428 }
429
mesh_add_ht_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)430 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
431 struct sk_buff *skb)
432 {
433 struct ieee80211_local *local = sdata->local;
434 struct ieee80211_chanctx_conf *chanctx_conf;
435 struct ieee80211_channel *channel;
436 struct ieee80211_supported_band *sband;
437 struct ieee80211_sta_ht_cap *ht_cap;
438 u8 *pos;
439
440 rcu_read_lock();
441 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
442 if (WARN_ON(!chanctx_conf)) {
443 rcu_read_unlock();
444 return -EINVAL;
445 }
446 channel = chanctx_conf->def.chan;
447 rcu_read_unlock();
448
449 sband = local->hw.wiphy->bands[channel->band];
450 ht_cap = &sband->ht_cap;
451
452 if (!ht_cap->ht_supported ||
453 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
454 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
455 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
456 return 0;
457
458 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
459 return -ENOMEM;
460
461 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
462 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
463 sdata->vif.bss_conf.ht_operation_mode,
464 false);
465
466 return 0;
467 }
468
mesh_add_vht_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)469 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
470 struct sk_buff *skb)
471 {
472 struct ieee80211_supported_band *sband;
473 u8 *pos;
474
475 sband = ieee80211_get_sband(sdata);
476 if (!sband)
477 return -EINVAL;
478
479 if (!sband->vht_cap.vht_supported ||
480 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
481 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
482 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
483 return 0;
484
485 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
486 return -ENOMEM;
487
488 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
489 ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
490
491 return 0;
492 }
493
mesh_add_vht_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)494 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
495 struct sk_buff *skb)
496 {
497 struct ieee80211_local *local = sdata->local;
498 struct ieee80211_chanctx_conf *chanctx_conf;
499 struct ieee80211_channel *channel;
500 struct ieee80211_supported_band *sband;
501 struct ieee80211_sta_vht_cap *vht_cap;
502 u8 *pos;
503
504 rcu_read_lock();
505 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
506 if (WARN_ON(!chanctx_conf)) {
507 rcu_read_unlock();
508 return -EINVAL;
509 }
510 channel = chanctx_conf->def.chan;
511 rcu_read_unlock();
512
513 sband = local->hw.wiphy->bands[channel->band];
514 vht_cap = &sband->vht_cap;
515
516 if (!vht_cap->vht_supported ||
517 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
518 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
519 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
520 return 0;
521
522 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
523 return -ENOMEM;
524
525 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
526 ieee80211_ie_build_vht_oper(pos, vht_cap,
527 &sdata->vif.bss_conf.chandef);
528
529 return 0;
530 }
531
ieee80211_mesh_path_timer(struct timer_list * t)532 static void ieee80211_mesh_path_timer(struct timer_list *t)
533 {
534 struct ieee80211_sub_if_data *sdata =
535 from_timer(sdata, t, u.mesh.mesh_path_timer);
536
537 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
538 }
539
ieee80211_mesh_path_root_timer(struct timer_list * t)540 static void ieee80211_mesh_path_root_timer(struct timer_list *t)
541 {
542 struct ieee80211_sub_if_data *sdata =
543 from_timer(sdata, t, u.mesh.mesh_path_root_timer);
544 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
545
546 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
547
548 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
549 }
550
ieee80211_mesh_root_setup(struct ieee80211_if_mesh * ifmsh)551 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
552 {
553 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
554 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
555 else {
556 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
557 /* stop running timer */
558 del_timer_sync(&ifmsh->mesh_path_root_timer);
559 }
560 }
561
562 /**
563 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
564 * @hdr: 802.11 frame header
565 * @fc: frame control field
566 * @meshda: destination address in the mesh
567 * @meshsa: source address address in the mesh. Same as TA, as frame is
568 * locally originated.
569 *
570 * Return the length of the 802.11 (does not include a mesh control header)
571 */
ieee80211_fill_mesh_addresses(struct ieee80211_hdr * hdr,__le16 * fc,const u8 * meshda,const u8 * meshsa)572 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
573 const u8 *meshda, const u8 *meshsa)
574 {
575 if (is_multicast_ether_addr(meshda)) {
576 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
577 /* DA TA SA */
578 memcpy(hdr->addr1, meshda, ETH_ALEN);
579 memcpy(hdr->addr2, meshsa, ETH_ALEN);
580 memcpy(hdr->addr3, meshsa, ETH_ALEN);
581 return 24;
582 } else {
583 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
584 /* RA TA DA SA */
585 eth_zero_addr(hdr->addr1); /* RA is resolved later */
586 memcpy(hdr->addr2, meshsa, ETH_ALEN);
587 memcpy(hdr->addr3, meshda, ETH_ALEN);
588 memcpy(hdr->addr4, meshsa, ETH_ALEN);
589 return 30;
590 }
591 }
592
593 /**
594 * ieee80211_new_mesh_header - create a new mesh header
595 * @sdata: mesh interface to be used
596 * @meshhdr: uninitialized mesh header
597 * @addr4or5: 1st address in the ae header, which may correspond to address 4
598 * (if addr6 is NULL) or address 5 (if addr6 is present). It may
599 * be NULL.
600 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
601 * mesh frame
602 *
603 * Return the header length.
604 */
ieee80211_new_mesh_header(struct ieee80211_sub_if_data * sdata,struct ieee80211s_hdr * meshhdr,const char * addr4or5,const char * addr6)605 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
606 struct ieee80211s_hdr *meshhdr,
607 const char *addr4or5, const char *addr6)
608 {
609 if (WARN_ON(!addr4or5 && addr6))
610 return 0;
611
612 memset(meshhdr, 0, sizeof(*meshhdr));
613
614 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
615
616 /* FIXME: racy -- TX on multiple queues can be concurrent */
617 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
618 sdata->u.mesh.mesh_seqnum++;
619
620 if (addr4or5 && !addr6) {
621 meshhdr->flags |= MESH_FLAGS_AE_A4;
622 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
623 return 2 * ETH_ALEN;
624 } else if (addr4or5 && addr6) {
625 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
626 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
627 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
628 return 3 * ETH_ALEN;
629 }
630
631 return ETH_ALEN;
632 }
633
ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data * sdata)634 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
635 {
636 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
637 u32 changed;
638
639 if (ifmsh->mshcfg.plink_timeout > 0)
640 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
641 mesh_path_expire(sdata);
642
643 changed = mesh_accept_plinks_update(sdata);
644 ieee80211_mbss_info_change_notify(sdata, changed);
645
646 mod_timer(&ifmsh->housekeeping_timer,
647 round_jiffies(jiffies +
648 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
649 }
650
ieee80211_mesh_rootpath(struct ieee80211_sub_if_data * sdata)651 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
652 {
653 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
654 u32 interval;
655
656 mesh_path_tx_root_frame(sdata);
657
658 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
659 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
660 else
661 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
662
663 mod_timer(&ifmsh->mesh_path_root_timer,
664 round_jiffies(TU_TO_EXP_TIME(interval)));
665 }
666
667 static int
ieee80211_mesh_build_beacon(struct ieee80211_if_mesh * ifmsh)668 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
669 {
670 struct beacon_data *bcn;
671 int head_len, tail_len;
672 struct sk_buff *skb;
673 struct ieee80211_mgmt *mgmt;
674 struct ieee80211_chanctx_conf *chanctx_conf;
675 struct mesh_csa_settings *csa;
676 enum nl80211_band band;
677 u8 *pos;
678 struct ieee80211_sub_if_data *sdata;
679 int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
680
681 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
682 rcu_read_lock();
683 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
684 band = chanctx_conf->def.chan->band;
685 rcu_read_unlock();
686
687 head_len = hdr_len +
688 2 + /* NULL SSID */
689 /* Channel Switch Announcement */
690 2 + sizeof(struct ieee80211_channel_sw_ie) +
691 /* Mesh Channel Switch Parameters */
692 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
693 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
694 2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
695 2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
696 2 + 8 + /* supported rates */
697 2 + 3; /* DS params */
698 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
699 2 + sizeof(struct ieee80211_ht_cap) +
700 2 + sizeof(struct ieee80211_ht_operation) +
701 2 + ifmsh->mesh_id_len +
702 2 + sizeof(struct ieee80211_meshconf_ie) +
703 2 + sizeof(__le16) + /* awake window */
704 2 + sizeof(struct ieee80211_vht_cap) +
705 2 + sizeof(struct ieee80211_vht_operation) +
706 ifmsh->ie_len;
707
708 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
709 /* need an skb for IE builders to operate on */
710 skb = dev_alloc_skb(max(head_len, tail_len));
711
712 if (!bcn || !skb)
713 goto out_free;
714
715 /*
716 * pointers go into the block we allocated,
717 * memory is | beacon_data | head | tail |
718 */
719 bcn->head = ((u8 *) bcn) + sizeof(*bcn);
720
721 /* fill in the head */
722 mgmt = skb_put_zero(skb, hdr_len);
723 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
724 IEEE80211_STYPE_BEACON);
725 eth_broadcast_addr(mgmt->da);
726 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
727 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
728 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
729 mgmt->u.beacon.beacon_int =
730 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
731 mgmt->u.beacon.capab_info |= cpu_to_le16(
732 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
733
734 pos = skb_put(skb, 2);
735 *pos++ = WLAN_EID_SSID;
736 *pos++ = 0x0;
737
738 rcu_read_lock();
739 csa = rcu_dereference(ifmsh->csa);
740 if (csa) {
741 enum nl80211_channel_type ct;
742 struct cfg80211_chan_def *chandef;
743 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
744 2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
745
746 pos = skb_put_zero(skb, ie_len);
747 *pos++ = WLAN_EID_CHANNEL_SWITCH;
748 *pos++ = 3;
749 *pos++ = 0x0;
750 *pos++ = ieee80211_frequency_to_channel(
751 csa->settings.chandef.chan->center_freq);
752 bcn->csa_current_counter = csa->settings.count;
753 bcn->csa_counter_offsets[0] = hdr_len + 6;
754 *pos++ = csa->settings.count;
755 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
756 *pos++ = 6;
757 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
758 *pos++ = ifmsh->mshcfg.dot11MeshTTL;
759 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
760 } else {
761 *pos++ = ifmsh->chsw_ttl;
762 }
763 *pos++ |= csa->settings.block_tx ?
764 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
765 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
766 pos += 2;
767 put_unaligned_le16(ifmsh->pre_value, pos);
768 pos += 2;
769
770 switch (csa->settings.chandef.width) {
771 case NL80211_CHAN_WIDTH_40:
772 ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
773 pos = skb_put_zero(skb, ie_len);
774
775 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
776 *pos++ = 1; /* len */
777 ct = cfg80211_get_chandef_type(&csa->settings.chandef);
778 if (ct == NL80211_CHAN_HT40PLUS)
779 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
780 else
781 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
782 break;
783 case NL80211_CHAN_WIDTH_80:
784 case NL80211_CHAN_WIDTH_80P80:
785 case NL80211_CHAN_WIDTH_160:
786 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
787 ie_len = 2 + 2 +
788 sizeof(struct ieee80211_wide_bw_chansw_ie);
789 pos = skb_put_zero(skb, ie_len);
790
791 *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
792 *pos++ = 5; /* len */
793 /* put sub IE */
794 chandef = &csa->settings.chandef;
795 ieee80211_ie_build_wide_bw_cs(pos, chandef);
796 break;
797 default:
798 break;
799 }
800 }
801 rcu_read_unlock();
802
803 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
804 mesh_add_ds_params_ie(sdata, skb))
805 goto out_free;
806
807 bcn->head_len = skb->len;
808 memcpy(bcn->head, skb->data, bcn->head_len);
809
810 /* now the tail */
811 skb_trim(skb, 0);
812 bcn->tail = bcn->head + bcn->head_len;
813
814 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
815 mesh_add_rsn_ie(sdata, skb) ||
816 mesh_add_ht_cap_ie(sdata, skb) ||
817 mesh_add_ht_oper_ie(sdata, skb) ||
818 mesh_add_meshid_ie(sdata, skb) ||
819 mesh_add_meshconf_ie(sdata, skb) ||
820 mesh_add_awake_window_ie(sdata, skb) ||
821 mesh_add_vht_cap_ie(sdata, skb) ||
822 mesh_add_vht_oper_ie(sdata, skb) ||
823 mesh_add_vendor_ies(sdata, skb))
824 goto out_free;
825
826 bcn->tail_len = skb->len;
827 memcpy(bcn->tail, skb->data, bcn->tail_len);
828 bcn->meshconf = (struct ieee80211_meshconf_ie *)
829 (bcn->tail + ifmsh->meshconf_offset);
830
831 dev_kfree_skb(skb);
832 rcu_assign_pointer(ifmsh->beacon, bcn);
833 return 0;
834 out_free:
835 kfree(bcn);
836 dev_kfree_skb(skb);
837 return -ENOMEM;
838 }
839
840 static int
ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data * sdata)841 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
842 {
843 struct beacon_data *old_bcn;
844 int ret;
845
846 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
847 lockdep_is_held(&sdata->wdev.mtx));
848 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
849 if (ret)
850 /* just reuse old beacon */
851 return ret;
852
853 if (old_bcn)
854 kfree_rcu(old_bcn, rcu_head);
855 return 0;
856 }
857
ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data * sdata,u32 changed)858 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
859 u32 changed)
860 {
861 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
862 unsigned long bits = changed;
863 u32 bit;
864
865 if (!bits)
866 return;
867
868 /* if we race with running work, worst case this work becomes a noop */
869 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
870 set_bit(bit, &ifmsh->mbss_changed);
871 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
872 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
873 }
874
ieee80211_start_mesh(struct ieee80211_sub_if_data * sdata)875 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
876 {
877 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
878 struct ieee80211_local *local = sdata->local;
879 u32 changed = BSS_CHANGED_BEACON |
880 BSS_CHANGED_BEACON_ENABLED |
881 BSS_CHANGED_HT |
882 BSS_CHANGED_BASIC_RATES |
883 BSS_CHANGED_BEACON_INT |
884 BSS_CHANGED_MCAST_RATE;
885
886 local->fif_other_bss++;
887 /* mesh ifaces must set allmulti to forward mcast traffic */
888 atomic_inc(&local->iff_allmultis);
889 ieee80211_configure_filter(local);
890
891 ifmsh->mesh_cc_id = 0; /* Disabled */
892 /* register sync ops from extensible synchronization framework */
893 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
894 ifmsh->sync_offset_clockdrift_max = 0;
895 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
896 ieee80211_mesh_root_setup(ifmsh);
897 ieee80211_queue_work(&local->hw, &sdata->work);
898 sdata->vif.bss_conf.ht_operation_mode =
899 ifmsh->mshcfg.ht_opmode;
900 sdata->vif.bss_conf.enable_beacon = true;
901
902 changed |= ieee80211_mps_local_status_update(sdata);
903
904 if (ieee80211_mesh_build_beacon(ifmsh)) {
905 ieee80211_stop_mesh(sdata);
906 return -ENOMEM;
907 }
908
909 ieee80211_recalc_dtim(local, sdata);
910 ieee80211_bss_info_change_notify(sdata, changed);
911
912 netif_carrier_on(sdata->dev);
913 return 0;
914 }
915
ieee80211_stop_mesh(struct ieee80211_sub_if_data * sdata)916 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
917 {
918 struct ieee80211_local *local = sdata->local;
919 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
920 struct beacon_data *bcn;
921
922 netif_carrier_off(sdata->dev);
923
924 /* flush STAs and mpaths on this iface */
925 sta_info_flush(sdata);
926 mesh_path_flush_by_iface(sdata);
927
928 /* stop the beacon */
929 ifmsh->mesh_id_len = 0;
930 sdata->vif.bss_conf.enable_beacon = false;
931 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
932 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
933
934 /* remove beacon */
935 bcn = rcu_dereference_protected(ifmsh->beacon,
936 lockdep_is_held(&sdata->wdev.mtx));
937 RCU_INIT_POINTER(ifmsh->beacon, NULL);
938 kfree_rcu(bcn, rcu_head);
939
940 /* free all potentially still buffered group-addressed frames */
941 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
942 skb_queue_purge(&ifmsh->ps.bc_buf);
943
944 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
945 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
946 del_timer_sync(&sdata->u.mesh.mesh_path_timer);
947
948 /* clear any mesh work (for next join) we may have accrued */
949 ifmsh->wrkq_flags = 0;
950 ifmsh->mbss_changed = 0;
951
952 local->fif_other_bss--;
953 atomic_dec(&local->iff_allmultis);
954 ieee80211_configure_filter(local);
955 }
956
ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data * sdata)957 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
958 {
959 int err;
960
961 /* if the current channel is a DFS channel, mark the channel as
962 * unavailable.
963 */
964 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
965 &sdata->vif.bss_conf.chandef,
966 NL80211_IFTYPE_MESH_POINT);
967 if (err > 0)
968 cfg80211_radar_event(sdata->local->hw.wiphy,
969 &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
970 }
971
972 static bool
ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,bool beacon)973 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
974 struct ieee802_11_elems *elems, bool beacon)
975 {
976 struct cfg80211_csa_settings params;
977 struct ieee80211_csa_ie csa_ie;
978 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
979 struct ieee80211_supported_band *sband;
980 int err;
981 u32 sta_flags;
982
983 sdata_assert_lock(sdata);
984
985 sband = ieee80211_get_sband(sdata);
986 if (!sband)
987 return false;
988
989 sta_flags = 0;
990 switch (sdata->vif.bss_conf.chandef.width) {
991 case NL80211_CHAN_WIDTH_20_NOHT:
992 sta_flags |= IEEE80211_STA_DISABLE_HT;
993 /* fall through */
994 case NL80211_CHAN_WIDTH_20:
995 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
996 /* fall through */
997 case NL80211_CHAN_WIDTH_40:
998 sta_flags |= IEEE80211_STA_DISABLE_VHT;
999 break;
1000 default:
1001 break;
1002 }
1003
1004 memset(¶ms, 0, sizeof(params));
1005 err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1006 sta_flags, sdata->vif.addr,
1007 &csa_ie);
1008 if (err < 0)
1009 return false;
1010 if (err)
1011 return false;
1012
1013 /* Mark the channel unavailable if the reason for the switch is
1014 * regulatory.
1015 */
1016 if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1017 ieee80211_mesh_csa_mark_radar(sdata);
1018
1019 params.chandef = csa_ie.chandef;
1020 params.count = csa_ie.count;
1021
1022 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef,
1023 IEEE80211_CHAN_DISABLED) ||
1024 !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
1025 NL80211_IFTYPE_MESH_POINT)) {
1026 sdata_info(sdata,
1027 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1028 sdata->vif.addr,
1029 params.chandef.chan->center_freq,
1030 params.chandef.width,
1031 params.chandef.center_freq1,
1032 params.chandef.center_freq2);
1033 return false;
1034 }
1035
1036 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1037 ¶ms.chandef,
1038 NL80211_IFTYPE_MESH_POINT);
1039 if (err < 0)
1040 return false;
1041 if (err > 0 && !ifmsh->userspace_handles_dfs) {
1042 sdata_info(sdata,
1043 "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1044 sdata->vif.addr,
1045 params.chandef.chan->center_freq,
1046 params.chandef.width,
1047 params.chandef.center_freq1,
1048 params.chandef.center_freq2);
1049 return false;
1050 }
1051
1052 params.radar_required = err;
1053
1054 if (cfg80211_chandef_identical(¶ms.chandef,
1055 &sdata->vif.bss_conf.chandef)) {
1056 mcsa_dbg(sdata,
1057 "received csa with an identical chandef, ignoring\n");
1058 return true;
1059 }
1060
1061 mcsa_dbg(sdata,
1062 "received channel switch announcement to go to channel %d MHz\n",
1063 params.chandef.chan->center_freq);
1064
1065 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1066 if (beacon) {
1067 ifmsh->chsw_ttl = csa_ie.ttl - 1;
1068 if (ifmsh->pre_value >= csa_ie.pre_value)
1069 return false;
1070 ifmsh->pre_value = csa_ie.pre_value;
1071 }
1072
1073 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1074 return false;
1075
1076 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1077
1078 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1079 ¶ms) < 0)
1080 return false;
1081
1082 return true;
1083 }
1084
1085 static void
ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1086 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1087 struct ieee80211_mgmt *mgmt, size_t len)
1088 {
1089 struct ieee80211_local *local = sdata->local;
1090 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1091 struct sk_buff *presp;
1092 struct beacon_data *bcn;
1093 struct ieee80211_mgmt *hdr;
1094 struct ieee802_11_elems elems;
1095 size_t baselen;
1096 u8 *pos;
1097
1098 pos = mgmt->u.probe_req.variable;
1099 baselen = (u8 *) pos - (u8 *) mgmt;
1100 if (baselen > len)
1101 return;
1102
1103 ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1104
1105 if (!elems.mesh_id)
1106 return;
1107
1108 /* 802.11-2012 10.1.4.3.2 */
1109 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1110 !is_broadcast_ether_addr(mgmt->da)) ||
1111 elems.ssid_len != 0)
1112 return;
1113
1114 if (elems.mesh_id_len != 0 &&
1115 (elems.mesh_id_len != ifmsh->mesh_id_len ||
1116 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1117 return;
1118
1119 rcu_read_lock();
1120 bcn = rcu_dereference(ifmsh->beacon);
1121
1122 if (!bcn)
1123 goto out;
1124
1125 presp = dev_alloc_skb(local->tx_headroom +
1126 bcn->head_len + bcn->tail_len);
1127 if (!presp)
1128 goto out;
1129
1130 skb_reserve(presp, local->tx_headroom);
1131 skb_put_data(presp, bcn->head, bcn->head_len);
1132 skb_put_data(presp, bcn->tail, bcn->tail_len);
1133 hdr = (struct ieee80211_mgmt *) presp->data;
1134 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1135 IEEE80211_STYPE_PROBE_RESP);
1136 memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1137 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1138 ieee80211_tx_skb(sdata, presp);
1139 out:
1140 rcu_read_unlock();
1141 }
1142
ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data * sdata,u16 stype,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1143 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1144 u16 stype,
1145 struct ieee80211_mgmt *mgmt,
1146 size_t len,
1147 struct ieee80211_rx_status *rx_status)
1148 {
1149 struct ieee80211_local *local = sdata->local;
1150 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1151 struct ieee802_11_elems elems;
1152 struct ieee80211_channel *channel;
1153 size_t baselen;
1154 int freq;
1155 enum nl80211_band band = rx_status->band;
1156
1157 /* ignore ProbeResp to foreign address */
1158 if (stype == IEEE80211_STYPE_PROBE_RESP &&
1159 !ether_addr_equal(mgmt->da, sdata->vif.addr))
1160 return;
1161
1162 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1163 if (baselen > len)
1164 return;
1165
1166 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1167 false, &elems);
1168
1169 /* ignore non-mesh or secure / unsecure mismatch */
1170 if ((!elems.mesh_id || !elems.mesh_config) ||
1171 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1172 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1173 return;
1174
1175 if (elems.ds_params)
1176 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1177 else
1178 freq = rx_status->freq;
1179
1180 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1181
1182 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1183 return;
1184
1185 if (mesh_matches_local(sdata, &elems)) {
1186 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1187 sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1188 if (!sdata->u.mesh.user_mpm ||
1189 sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1190 sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1191 mesh_neighbour_update(sdata, mgmt->sa, &elems);
1192 }
1193
1194 if (ifmsh->sync_ops)
1195 ifmsh->sync_ops->rx_bcn_presp(sdata,
1196 stype, mgmt, &elems, rx_status);
1197
1198 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1199 !sdata->vif.csa_active)
1200 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1201 }
1202
ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data * sdata)1203 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1204 {
1205 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1206 struct mesh_csa_settings *tmp_csa_settings;
1207 int ret = 0;
1208 int changed = 0;
1209
1210 /* Reset the TTL value and Initiator flag */
1211 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1212 ifmsh->chsw_ttl = 0;
1213
1214 /* Remove the CSA and MCSP elements from the beacon */
1215 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1216 RCU_INIT_POINTER(ifmsh->csa, NULL);
1217 if (tmp_csa_settings)
1218 kfree_rcu(tmp_csa_settings, rcu_head);
1219 ret = ieee80211_mesh_rebuild_beacon(sdata);
1220 if (ret)
1221 return -EINVAL;
1222
1223 changed |= BSS_CHANGED_BEACON;
1224
1225 mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1226 sdata->vif.bss_conf.chandef.chan->center_freq);
1227 return changed;
1228 }
1229
ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data * sdata,struct cfg80211_csa_settings * csa_settings)1230 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1231 struct cfg80211_csa_settings *csa_settings)
1232 {
1233 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1234 struct mesh_csa_settings *tmp_csa_settings;
1235 int ret = 0;
1236
1237 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1238 GFP_ATOMIC);
1239 if (!tmp_csa_settings)
1240 return -ENOMEM;
1241
1242 memcpy(&tmp_csa_settings->settings, csa_settings,
1243 sizeof(struct cfg80211_csa_settings));
1244
1245 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1246
1247 ret = ieee80211_mesh_rebuild_beacon(sdata);
1248 if (ret) {
1249 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1250 RCU_INIT_POINTER(ifmsh->csa, NULL);
1251 kfree_rcu(tmp_csa_settings, rcu_head);
1252 return ret;
1253 }
1254
1255 return BSS_CHANGED_BEACON;
1256 }
1257
mesh_fwd_csa_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee802_11_elems * elems)1258 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1259 struct ieee80211_mgmt *mgmt, size_t len,
1260 struct ieee802_11_elems *elems)
1261 {
1262 struct ieee80211_mgmt *mgmt_fwd;
1263 struct sk_buff *skb;
1264 struct ieee80211_local *local = sdata->local;
1265
1266 skb = dev_alloc_skb(local->tx_headroom + len);
1267 if (!skb)
1268 return -ENOMEM;
1269 skb_reserve(skb, local->tx_headroom);
1270 mgmt_fwd = skb_put(skb, len);
1271
1272 elems->mesh_chansw_params_ie->mesh_ttl--;
1273 elems->mesh_chansw_params_ie->mesh_flags &=
1274 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1275
1276 memcpy(mgmt_fwd, mgmt, len);
1277 eth_broadcast_addr(mgmt_fwd->da);
1278 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1279 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1280
1281 ieee80211_tx_skb(sdata, skb);
1282 return 0;
1283 }
1284
mesh_rx_csa_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1285 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1286 struct ieee80211_mgmt *mgmt, size_t len)
1287 {
1288 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1289 struct ieee802_11_elems elems;
1290 u16 pre_value;
1291 bool fwd_csa = true;
1292 size_t baselen;
1293 u8 *pos;
1294
1295 if (mgmt->u.action.u.measurement.action_code !=
1296 WLAN_ACTION_SPCT_CHL_SWITCH)
1297 return;
1298
1299 pos = mgmt->u.action.u.chan_switch.variable;
1300 baselen = offsetof(struct ieee80211_mgmt,
1301 u.action.u.chan_switch.variable);
1302 ieee802_11_parse_elems(pos, len - baselen, true, &elems);
1303
1304 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1305 if (!--ifmsh->chsw_ttl)
1306 fwd_csa = false;
1307
1308 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1309 if (ifmsh->pre_value >= pre_value)
1310 return;
1311
1312 ifmsh->pre_value = pre_value;
1313
1314 if (!sdata->vif.csa_active &&
1315 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1316 mcsa_dbg(sdata, "Failed to process CSA action frame");
1317 return;
1318 }
1319
1320 /* forward or re-broadcast the CSA frame */
1321 if (fwd_csa) {
1322 if (mesh_fwd_csa_frame(sdata, mgmt, len, &elems) < 0)
1323 mcsa_dbg(sdata, "Failed to forward the CSA frame");
1324 }
1325 }
1326
ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1327 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1328 struct ieee80211_mgmt *mgmt,
1329 size_t len,
1330 struct ieee80211_rx_status *rx_status)
1331 {
1332 switch (mgmt->u.action.category) {
1333 case WLAN_CATEGORY_SELF_PROTECTED:
1334 switch (mgmt->u.action.u.self_prot.action_code) {
1335 case WLAN_SP_MESH_PEERING_OPEN:
1336 case WLAN_SP_MESH_PEERING_CLOSE:
1337 case WLAN_SP_MESH_PEERING_CONFIRM:
1338 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1339 break;
1340 }
1341 break;
1342 case WLAN_CATEGORY_MESH_ACTION:
1343 if (mesh_action_is_path_sel(mgmt))
1344 mesh_rx_path_sel_frame(sdata, mgmt, len);
1345 break;
1346 case WLAN_CATEGORY_SPECTRUM_MGMT:
1347 mesh_rx_csa_frame(sdata, mgmt, len);
1348 break;
1349 }
1350 }
1351
ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1352 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1353 struct sk_buff *skb)
1354 {
1355 struct ieee80211_rx_status *rx_status;
1356 struct ieee80211_mgmt *mgmt;
1357 u16 stype;
1358
1359 sdata_lock(sdata);
1360
1361 /* mesh already went down */
1362 if (!sdata->u.mesh.mesh_id_len)
1363 goto out;
1364
1365 rx_status = IEEE80211_SKB_RXCB(skb);
1366 mgmt = (struct ieee80211_mgmt *) skb->data;
1367 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1368
1369 switch (stype) {
1370 case IEEE80211_STYPE_PROBE_RESP:
1371 case IEEE80211_STYPE_BEACON:
1372 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1373 rx_status);
1374 break;
1375 case IEEE80211_STYPE_PROBE_REQ:
1376 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1377 break;
1378 case IEEE80211_STYPE_ACTION:
1379 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1380 break;
1381 }
1382 out:
1383 sdata_unlock(sdata);
1384 }
1385
mesh_bss_info_changed(struct ieee80211_sub_if_data * sdata)1386 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1387 {
1388 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1389 u32 bit, changed = 0;
1390
1391 for_each_set_bit(bit, &ifmsh->mbss_changed,
1392 sizeof(changed) * BITS_PER_BYTE) {
1393 clear_bit(bit, &ifmsh->mbss_changed);
1394 changed |= BIT(bit);
1395 }
1396
1397 if (sdata->vif.bss_conf.enable_beacon &&
1398 (changed & (BSS_CHANGED_BEACON |
1399 BSS_CHANGED_HT |
1400 BSS_CHANGED_BASIC_RATES |
1401 BSS_CHANGED_BEACON_INT)))
1402 if (ieee80211_mesh_rebuild_beacon(sdata))
1403 return;
1404
1405 ieee80211_bss_info_change_notify(sdata, changed);
1406 }
1407
ieee80211_mesh_work(struct ieee80211_sub_if_data * sdata)1408 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1409 {
1410 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1411
1412 sdata_lock(sdata);
1413
1414 /* mesh already went down */
1415 if (!sdata->u.mesh.mesh_id_len)
1416 goto out;
1417
1418 if (ifmsh->preq_queue_len &&
1419 time_after(jiffies,
1420 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1421 mesh_path_start_discovery(sdata);
1422
1423 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1424 ieee80211_mesh_housekeeping(sdata);
1425
1426 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1427 ieee80211_mesh_rootpath(sdata);
1428
1429 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1430 mesh_sync_adjust_tsf(sdata);
1431
1432 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1433 mesh_bss_info_changed(sdata);
1434 out:
1435 sdata_unlock(sdata);
1436 }
1437
1438
ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data * sdata)1439 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1440 {
1441 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1442 static u8 zero_addr[ETH_ALEN] = {};
1443
1444 timer_setup(&ifmsh->housekeeping_timer,
1445 ieee80211_mesh_housekeeping_timer, 0);
1446
1447 ifmsh->accepting_plinks = true;
1448 atomic_set(&ifmsh->mpaths, 0);
1449 mesh_rmc_init(sdata);
1450 ifmsh->last_preq = jiffies;
1451 ifmsh->next_perr = jiffies;
1452 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1453 /* Allocate all mesh structures when creating the first mesh interface. */
1454 if (!mesh_allocated)
1455 ieee80211s_init();
1456
1457 mesh_pathtbl_init(sdata);
1458
1459 timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1460 timer_setup(&ifmsh->mesh_path_root_timer,
1461 ieee80211_mesh_path_root_timer, 0);
1462 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1463 skb_queue_head_init(&ifmsh->ps.bc_buf);
1464 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1465 spin_lock_init(&ifmsh->sync_offset_lock);
1466 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1467
1468 sdata->vif.bss_conf.bssid = zero_addr;
1469 }
1470
ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data * sdata)1471 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1472 {
1473 mesh_rmc_free(sdata);
1474 mesh_pathtbl_unregister(sdata);
1475 }
1476
