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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
17static int mesh_allocated;
18static struct kmem_cache *rm_cache;
19
20bool 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
26void 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
33void ieee80211s_stop(void)
34{
35 if (!mesh_allocated)
36 return;
37 kmem_cache_destroy(rm_cache);
38}
39
40static void ieee80211_mesh_housekeeping_timer(unsigned long data)
41{
42 struct ieee80211_sub_if_data *sdata = (void *) data;
43 struct ieee80211_local *local = sdata->local;
44 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
45
46 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
47
48 ieee80211_queue_work(&local->hw, &sdata->work);
49}
50
51/**
52 * mesh_matches_local - check if the config of a mesh point matches ours
53 *
54 * @sdata: local mesh subif
55 * @ie: information elements of a management frame from the mesh peer
56 *
57 * This function checks if the mesh configuration of a mesh point matches the
58 * local mesh configuration, i.e. if both nodes belong to the same mesh network.
59 */
60bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
61 struct ieee802_11_elems *ie)
62{
63 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
64 u32 basic_rates = 0;
65 struct cfg80211_chan_def sta_chan_def;
66
67 /*
68 * As support for each feature is added, check for matching
69 * - On mesh config capabilities
70 * - Power Save Support En
71 * - Sync support enabled
72 * - Sync support active
73 * - Sync support required from peer
74 * - MDA enabled
75 * - Power management control on fc
76 */
77 if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
78 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
79 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
80 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
81 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
82 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
83 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
84 return false;
85
86 ieee80211_sta_get_rates(sdata, ie, ieee80211_get_sdata_band(sdata),
87 &basic_rates);
88
89 if (sdata->vif.bss_conf.basic_rates != basic_rates)
90 return false;
91
92 cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
93 NL80211_CHAN_NO_HT);
94 ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
95 ieee80211_chandef_vht_oper(ie->vht_operation, &sta_chan_def);
96
97 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
98 &sta_chan_def))
99 return false;
100
101 return true;
102}
103
104/**
105 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
106 *
107 * @ie: information elements of a management frame from the mesh peer
108 */
109bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
110{
111 return (ie->mesh_config->meshconf_cap &
112 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
113}
114
115/**
116 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
117 *
118 * @sdata: mesh interface in which mesh beacons are going to be updated
119 *
120 * Returns: beacon changed flag if the beacon content changed.
121 */
122u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
123{
124 bool free_plinks;
125 u32 changed = 0;
126
127 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
128 * the mesh interface might be able to establish plinks with peers that
129 * are already on the table but are not on PLINK_ESTAB state. However,
130 * in general the mesh interface is not accepting peer link requests
131 * from new peers, and that must be reflected in the beacon
132 */
133 free_plinks = mesh_plink_availables(sdata);
134
135 if (free_plinks != sdata->u.mesh.accepting_plinks) {
136 sdata->u.mesh.accepting_plinks = free_plinks;
137 changed = BSS_CHANGED_BEACON;
138 }
139
140 return changed;
141}
142
143/*
144 * mesh_sta_cleanup - clean up any mesh sta state
145 *
146 * @sta: mesh sta to clean up.
147 */
148void mesh_sta_cleanup(struct sta_info *sta)
149{
150 struct ieee80211_sub_if_data *sdata = sta->sdata;
151 u32 changed = mesh_plink_deactivate(sta);
152
153 if (changed)
154 ieee80211_mbss_info_change_notify(sdata, changed);
155}
156
157int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
158{
159 int i;
160
161 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
162 if (!sdata->u.mesh.rmc)
163 return -ENOMEM;
164 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
165 for (i = 0; i < RMC_BUCKETS; i++)
166 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
167 return 0;
168}
169
170void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
171{
172 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
173 struct rmc_entry *p;
174 struct hlist_node *n;
175 int i;
176
177 if (!sdata->u.mesh.rmc)
178 return;
179
180 for (i = 0; i < RMC_BUCKETS; i++) {
181 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
182 hlist_del(&p->list);
183 kmem_cache_free(rm_cache, p);
184 }
185 }
186
187 kfree(rmc);
188 sdata->u.mesh.rmc = NULL;
189}
190
191/**
192 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
193 *
194 * @sdata: interface
195 * @sa: source address
196 * @mesh_hdr: mesh_header
197 *
198 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
199 *
200 * Checks using the source address and the mesh sequence number if we have
201 * received this frame lately. If the frame is not in the cache, it is added to
202 * it.
203 */
204int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
205 const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
206{
207 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
208 u32 seqnum = 0;
209 int entries = 0;
210 u8 idx;
211 struct rmc_entry *p;
212 struct hlist_node *n;
213
214 if (!rmc)
215 return -1;
216
217 /* Don't care about endianness since only match matters */
218 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
219 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
220 hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
221 ++entries;
222 if (time_after(jiffies, p->exp_time) ||
223 entries == RMC_QUEUE_MAX_LEN) {
224 hlist_del(&p->list);
225 kmem_cache_free(rm_cache, p);
226 --entries;
227 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
228 return -1;
229 }
230
231 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
232 if (!p)
233 return 0;
234
235 p->seqnum = seqnum;
236 p->exp_time = jiffies + RMC_TIMEOUT;
237 memcpy(p->sa, sa, ETH_ALEN);
238 hlist_add_head(&p->list, &rmc->bucket[idx]);
239 return 0;
240}
241
242int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
243 struct sk_buff *skb)
244{
245 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
246 u8 *pos, neighbors;
247 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
248
249 if (skb_tailroom(skb) < 2 + meshconf_len)
250 return -ENOMEM;
251
252 pos = skb_put(skb, 2 + meshconf_len);
253 *pos++ = WLAN_EID_MESH_CONFIG;
254 *pos++ = meshconf_len;
255
256 /* save a pointer for quick updates in pre-tbtt */
257 ifmsh->meshconf_offset = pos - skb->data;
258
259 /* Active path selection protocol ID */
260 *pos++ = ifmsh->mesh_pp_id;
261 /* Active path selection metric ID */
262 *pos++ = ifmsh->mesh_pm_id;
263 /* Congestion control mode identifier */
264 *pos++ = ifmsh->mesh_cc_id;
265 /* Synchronization protocol identifier */
266 *pos++ = ifmsh->mesh_sp_id;
267 /* Authentication Protocol identifier */
268 *pos++ = ifmsh->mesh_auth_id;
269 /* Mesh Formation Info - number of neighbors */
270 neighbors = atomic_read(&ifmsh->estab_plinks);
271 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
272 *pos++ = neighbors << 1;
273 /* Mesh capability */
274 *pos = 0x00;
275 *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
276 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
277 *pos |= ifmsh->accepting_plinks ?
278 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
279 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
280 *pos |= ifmsh->ps_peers_deep_sleep ?
281 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
282 *pos++ |= ifmsh->adjusting_tbtt ?
283 IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
284 *pos++ = 0x00;
285
286 return 0;
287}
288
289int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
290{
291 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
292 u8 *pos;
293
294 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
295 return -ENOMEM;
296
297 pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
298 *pos++ = WLAN_EID_MESH_ID;
299 *pos++ = ifmsh->mesh_id_len;
300 if (ifmsh->mesh_id_len)
301 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
302
303 return 0;
304}
305
306static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
307 struct sk_buff *skb)
308{
309 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
310 u8 *pos;
311
312 /* see IEEE802.11-2012 13.14.6 */
313 if (ifmsh->ps_peers_light_sleep == 0 &&
314 ifmsh->ps_peers_deep_sleep == 0 &&
315 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
316 return 0;
317
318 if (skb_tailroom(skb) < 4)
319 return -ENOMEM;
320
321 pos = skb_put(skb, 2 + 2);
322 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
323 *pos++ = 2;
324 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
325
326 return 0;
327}
328
329int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
330 struct sk_buff *skb)
331{
332 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
333 u8 offset, len;
334 const u8 *data;
335
336 if (!ifmsh->ie || !ifmsh->ie_len)
337 return 0;
338
339 /* fast-forward to vendor IEs */
340 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
341
342 if (offset < ifmsh->ie_len) {
343 len = ifmsh->ie_len - offset;
344 data = ifmsh->ie + offset;
345 if (skb_tailroom(skb) < len)
346 return -ENOMEM;
347 memcpy(skb_put(skb, len), data, len);
348 }
349
350 return 0;
351}
352
353int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
354{
355 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
356 u8 len = 0;
357 const u8 *data;
358
359 if (!ifmsh->ie || !ifmsh->ie_len)
360 return 0;
361
362 /* find RSN IE */
363 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
364 if (!data)
365 return 0;
366
367 len = data[1] + 2;
368
369 if (skb_tailroom(skb) < len)
370 return -ENOMEM;
371 memcpy(skb_put(skb, len), data, len);
372
373 return 0;
374}
375
376static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
377 struct sk_buff *skb)
378{
379 struct ieee80211_chanctx_conf *chanctx_conf;
380 struct ieee80211_channel *chan;
381 u8 *pos;
382
383 if (skb_tailroom(skb) < 3)
384 return -ENOMEM;
385
386 rcu_read_lock();
387 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
388 if (WARN_ON(!chanctx_conf)) {
389 rcu_read_unlock();
390 return -EINVAL;
391 }
392 chan = chanctx_conf->def.chan;
393 rcu_read_unlock();
394
395 pos = skb_put(skb, 2 + 1);
396 *pos++ = WLAN_EID_DS_PARAMS;
397 *pos++ = 1;
398 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
399
400 return 0;
401}
402
403int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
404 struct sk_buff *skb)
405{
406 struct ieee80211_local *local = sdata->local;
407 enum nl80211_band band = ieee80211_get_sdata_band(sdata);
408 struct ieee80211_supported_band *sband;
409 u8 *pos;
410
411 sband = local->hw.wiphy->bands[band];
412 if (!sband->ht_cap.ht_supported ||
413 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
414 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
415 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
416 return 0;
417
418 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
419 return -ENOMEM;
420
421 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
422 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
423
424 return 0;
425}
426
427int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
428 struct sk_buff *skb)
429{
430 struct ieee80211_local *local = sdata->local;
431 struct ieee80211_chanctx_conf *chanctx_conf;
432 struct ieee80211_channel *channel;
433 struct ieee80211_supported_band *sband;
434 struct ieee80211_sta_ht_cap *ht_cap;
435 u8 *pos;
436
437 rcu_read_lock();
438 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
439 if (WARN_ON(!chanctx_conf)) {
440 rcu_read_unlock();
441 return -EINVAL;
442 }
443 channel = chanctx_conf->def.chan;
444 rcu_read_unlock();
445
446 sband = local->hw.wiphy->bands[channel->band];
447 ht_cap = &sband->ht_cap;
448
449 if (!ht_cap->ht_supported ||
450 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
451 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
452 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
453 return 0;
454
455 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
456 return -ENOMEM;
457
458 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
459 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
460 sdata->vif.bss_conf.ht_operation_mode,
461 false);
462
463 return 0;
464}
465
466int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
467 struct sk_buff *skb)
468{
469 struct ieee80211_local *local = sdata->local;
470 enum nl80211_band band = ieee80211_get_sdata_band(sdata);
471 struct ieee80211_supported_band *sband;
472 u8 *pos;
473
474 sband = local->hw.wiphy->bands[band];
475 if (!sband->vht_cap.vht_supported ||
476 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
477 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
478 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
479 return 0;
480
481 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
482 return -ENOMEM;
483
484 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
485 ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
486
487 return 0;
488}
489
490int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
491 struct sk_buff *skb)
492{
493 struct ieee80211_local *local = sdata->local;
494 struct ieee80211_chanctx_conf *chanctx_conf;
495 struct ieee80211_channel *channel;
496 struct ieee80211_supported_band *sband;
497 struct ieee80211_sta_vht_cap *vht_cap;
498 u8 *pos;
499
500 rcu_read_lock();
501 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
502 if (WARN_ON(!chanctx_conf)) {
503 rcu_read_unlock();
504 return -EINVAL;
505 }
506 channel = chanctx_conf->def.chan;
507 rcu_read_unlock();
508
509 sband = local->hw.wiphy->bands[channel->band];
510 vht_cap = &sband->vht_cap;
511
512 if (!vht_cap->vht_supported ||
513 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
514 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
515 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
516 return 0;
517
518 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
519 return -ENOMEM;
520
521 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
522 ieee80211_ie_build_vht_oper(pos, vht_cap,
523 &sdata->vif.bss_conf.chandef);
524
525 return 0;
526}
527
528static void ieee80211_mesh_path_timer(unsigned long data)
529{
530 struct ieee80211_sub_if_data *sdata =
531 (struct ieee80211_sub_if_data *) data;
532
533 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
534}
535
536static void ieee80211_mesh_path_root_timer(unsigned long data)
537{
538 struct ieee80211_sub_if_data *sdata =
539 (struct ieee80211_sub_if_data *) data;
540 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
541
542 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
543
544 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
545}
546
547void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
548{
549 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
550 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
551 else {
552 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
553 /* stop running timer */
554 del_timer_sync(&ifmsh->mesh_path_root_timer);
555 }
556}
557
558/**
559 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
560 * @hdr: 802.11 frame header
561 * @fc: frame control field
562 * @meshda: destination address in the mesh
563 * @meshsa: source address address in the mesh. Same as TA, as frame is
564 * locally originated.
565 *
566 * Return the length of the 802.11 (does not include a mesh control header)
567 */
568int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
569 const u8 *meshda, const u8 *meshsa)
570{
571 if (is_multicast_ether_addr(meshda)) {
572 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
573 /* DA TA SA */
574 memcpy(hdr->addr1, meshda, ETH_ALEN);
575 memcpy(hdr->addr2, meshsa, ETH_ALEN);
576 memcpy(hdr->addr3, meshsa, ETH_ALEN);
577 return 24;
578 } else {
579 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
580 /* RA TA DA SA */
581 eth_zero_addr(hdr->addr1); /* RA is resolved later */
582 memcpy(hdr->addr2, meshsa, ETH_ALEN);
583 memcpy(hdr->addr3, meshda, ETH_ALEN);
584 memcpy(hdr->addr4, meshsa, ETH_ALEN);
585 return 30;
586 }
587}
588
589/**
590 * ieee80211_new_mesh_header - create a new mesh header
591 * @sdata: mesh interface to be used
592 * @meshhdr: uninitialized mesh header
593 * @addr4or5: 1st address in the ae header, which may correspond to address 4
594 * (if addr6 is NULL) or address 5 (if addr6 is present). It may
595 * be NULL.
596 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
597 * mesh frame
598 *
599 * Return the header length.
600 */
601unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
602 struct ieee80211s_hdr *meshhdr,
603 const char *addr4or5, const char *addr6)
604{
605 if (WARN_ON(!addr4or5 && addr6))
606 return 0;
607
608 memset(meshhdr, 0, sizeof(*meshhdr));
609
610 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
611
612 /* FIXME: racy -- TX on multiple queues can be concurrent */
613 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
614 sdata->u.mesh.mesh_seqnum++;
615
616 if (addr4or5 && !addr6) {
617 meshhdr->flags |= MESH_FLAGS_AE_A4;
618 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
619 return 2 * ETH_ALEN;
620 } else if (addr4or5 && addr6) {
621 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
622 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
623 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
624 return 3 * ETH_ALEN;
625 }
626
627 return ETH_ALEN;
628}
629
630static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
631{
632 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
633 u32 changed;
634
635 if (ifmsh->mshcfg.plink_timeout > 0)
636 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
637 mesh_path_expire(sdata);
638
639 changed = mesh_accept_plinks_update(sdata);
640 ieee80211_mbss_info_change_notify(sdata, changed);
641
642 mod_timer(&ifmsh->housekeeping_timer,
643 round_jiffies(jiffies +
644 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
645}
646
647static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
648{
649 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
650 u32 interval;
651
652 mesh_path_tx_root_frame(sdata);
653
654 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
655 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
656 else
657 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
658
659 mod_timer(&ifmsh->mesh_path_root_timer,
660 round_jiffies(TU_TO_EXP_TIME(interval)));
661}
662
663static int
664ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
665{
666 struct beacon_data *bcn;
667 int head_len, tail_len;
668 struct sk_buff *skb;
669 struct ieee80211_mgmt *mgmt;
670 struct ieee80211_chanctx_conf *chanctx_conf;
671 struct mesh_csa_settings *csa;
672 enum nl80211_band band;
673 u8 *pos;
674 struct ieee80211_sub_if_data *sdata;
675 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
676 sizeof(mgmt->u.beacon);
677
678 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
679 rcu_read_lock();
680 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
681 band = chanctx_conf->def.chan->band;
682 rcu_read_unlock();
683
684 head_len = hdr_len +
685 2 + /* NULL SSID */
686 /* Channel Switch Announcement */
687 2 + sizeof(struct ieee80211_channel_sw_ie) +
688 /* Mesh Channel Swith Parameters */
689 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
690 2 + 8 + /* supported rates */
691 2 + 3; /* DS params */
692 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
693 2 + sizeof(struct ieee80211_ht_cap) +
694 2 + sizeof(struct ieee80211_ht_operation) +
695 2 + ifmsh->mesh_id_len +
696 2 + sizeof(struct ieee80211_meshconf_ie) +
697 2 + sizeof(__le16) + /* awake window */
698 2 + sizeof(struct ieee80211_vht_cap) +
699 2 + sizeof(struct ieee80211_vht_operation) +
700 ifmsh->ie_len;
701
702 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
703 /* need an skb for IE builders to operate on */
704 skb = dev_alloc_skb(max(head_len, tail_len));
705
706 if (!bcn || !skb)
707 goto out_free;
708
709 /*
710 * pointers go into the block we allocated,
711 * memory is | beacon_data | head | tail |
712 */
713 bcn->head = ((u8 *) bcn) + sizeof(*bcn);
714
715 /* fill in the head */
716 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
717 memset(mgmt, 0, hdr_len);
718 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
719 IEEE80211_STYPE_BEACON);
720 eth_broadcast_addr(mgmt->da);
721 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
722 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
723 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
724 mgmt->u.beacon.beacon_int =
725 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
726 mgmt->u.beacon.capab_info |= cpu_to_le16(
727 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
728
729 pos = skb_put(skb, 2);
730 *pos++ = WLAN_EID_SSID;
731 *pos++ = 0x0;
732
733 rcu_read_lock();
734 csa = rcu_dereference(ifmsh->csa);
735 if (csa) {
736 pos = skb_put(skb, 13);
737 memset(pos, 0, 13);
738 *pos++ = WLAN_EID_CHANNEL_SWITCH;
739 *pos++ = 3;
740 *pos++ = 0x0;
741 *pos++ = ieee80211_frequency_to_channel(
742 csa->settings.chandef.chan->center_freq);
743 bcn->csa_current_counter = csa->settings.count;
744 bcn->csa_counter_offsets[0] = hdr_len + 6;
745 *pos++ = csa->settings.count;
746 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
747 *pos++ = 6;
748 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
749 *pos++ = ifmsh->mshcfg.dot11MeshTTL;
750 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
751 } else {
752 *pos++ = ifmsh->chsw_ttl;
753 }
754 *pos++ |= csa->settings.block_tx ?
755 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
756 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
757 pos += 2;
758 put_unaligned_le16(ifmsh->pre_value, pos);
759 pos += 2;
760 }
761 rcu_read_unlock();
762
763 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
764 mesh_add_ds_params_ie(sdata, skb))
765 goto out_free;
766
767 bcn->head_len = skb->len;
768 memcpy(bcn->head, skb->data, bcn->head_len);
769
770 /* now the tail */
771 skb_trim(skb, 0);
772 bcn->tail = bcn->head + bcn->head_len;
773
774 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
775 mesh_add_rsn_ie(sdata, skb) ||
776 mesh_add_ht_cap_ie(sdata, skb) ||
777 mesh_add_ht_oper_ie(sdata, skb) ||
778 mesh_add_meshid_ie(sdata, skb) ||
779 mesh_add_meshconf_ie(sdata, skb) ||
780 mesh_add_awake_window_ie(sdata, skb) ||
781 mesh_add_vht_cap_ie(sdata, skb) ||
782 mesh_add_vht_oper_ie(sdata, skb) ||
783 mesh_add_vendor_ies(sdata, skb))
784 goto out_free;
785
786 bcn->tail_len = skb->len;
787 memcpy(bcn->tail, skb->data, bcn->tail_len);
788 bcn->meshconf = (struct ieee80211_meshconf_ie *)
789 (bcn->tail + ifmsh->meshconf_offset);
790
791 dev_kfree_skb(skb);
792 rcu_assign_pointer(ifmsh->beacon, bcn);
793 return 0;
794out_free:
795 kfree(bcn);
796 dev_kfree_skb(skb);
797 return -ENOMEM;
798}
799
800static int
801ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
802{
803 struct beacon_data *old_bcn;
804 int ret;
805
806 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
807 lockdep_is_held(&sdata->wdev.mtx));
808 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
809 if (ret)
810 /* just reuse old beacon */
811 return ret;
812
813 if (old_bcn)
814 kfree_rcu(old_bcn, rcu_head);
815 return 0;
816}
817
818void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
819 u32 changed)
820{
821 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
822 unsigned long bits = changed;
823 u32 bit;
824
825 if (!bits)
826 return;
827
828 /* if we race with running work, worst case this work becomes a noop */
829 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
830 set_bit(bit, &ifmsh->mbss_changed);
831 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
832 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
833}
834
835int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
836{
837 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
838 struct ieee80211_local *local = sdata->local;
839 u32 changed = BSS_CHANGED_BEACON |
840 BSS_CHANGED_BEACON_ENABLED |
841 BSS_CHANGED_HT |
842 BSS_CHANGED_BASIC_RATES |
843 BSS_CHANGED_BEACON_INT;
844
845 local->fif_other_bss++;
846 /* mesh ifaces must set allmulti to forward mcast traffic */
847 atomic_inc(&local->iff_allmultis);
848 ieee80211_configure_filter(local);
849
850 ifmsh->mesh_cc_id = 0; /* Disabled */
851 /* register sync ops from extensible synchronization framework */
852 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
853 ifmsh->adjusting_tbtt = false;
854 ifmsh->sync_offset_clockdrift_max = 0;
855 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
856 ieee80211_mesh_root_setup(ifmsh);
857 ieee80211_queue_work(&local->hw, &sdata->work);
858 sdata->vif.bss_conf.ht_operation_mode =
859 ifmsh->mshcfg.ht_opmode;
860 sdata->vif.bss_conf.enable_beacon = true;
861
862 changed |= ieee80211_mps_local_status_update(sdata);
863
864 if (ieee80211_mesh_build_beacon(ifmsh)) {
865 ieee80211_stop_mesh(sdata);
866 return -ENOMEM;
867 }
868
869 ieee80211_recalc_dtim(local, sdata);
870 ieee80211_bss_info_change_notify(sdata, changed);
871
872 netif_carrier_on(sdata->dev);
873 return 0;
874}
875
876void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
877{
878 struct ieee80211_local *local = sdata->local;
879 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
880 struct beacon_data *bcn;
881
882 netif_carrier_off(sdata->dev);
883
884 /* flush STAs and mpaths on this iface */
885 sta_info_flush(sdata);
886 mesh_path_flush_by_iface(sdata);
887
888 /* stop the beacon */
889 ifmsh->mesh_id_len = 0;
890 sdata->vif.bss_conf.enable_beacon = false;
891 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
892 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
893
894 /* remove beacon */
895 bcn = rcu_dereference_protected(ifmsh->beacon,
896 lockdep_is_held(&sdata->wdev.mtx));
897 RCU_INIT_POINTER(ifmsh->beacon, NULL);
898 kfree_rcu(bcn, rcu_head);
899
900 /* free all potentially still buffered group-addressed frames */
901 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
902 skb_queue_purge(&ifmsh->ps.bc_buf);
903
904 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
905 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
906 del_timer_sync(&sdata->u.mesh.mesh_path_timer);
907
908 /* clear any mesh work (for next join) we may have accrued */
909 ifmsh->wrkq_flags = 0;
910 ifmsh->mbss_changed = 0;
911
912 local->fif_other_bss--;
913 atomic_dec(&local->iff_allmultis);
914 ieee80211_configure_filter(local);
915}
916
917static bool
918ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
919 struct ieee802_11_elems *elems, bool beacon)
920{
921 struct cfg80211_csa_settings params;
922 struct ieee80211_csa_ie csa_ie;
923 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
924 enum nl80211_band band = ieee80211_get_sdata_band(sdata);
925 int err;
926 u32 sta_flags;
927
928 sdata_assert_lock(sdata);
929
930 sta_flags = IEEE80211_STA_DISABLE_VHT;
931 switch (sdata->vif.bss_conf.chandef.width) {
932 case NL80211_CHAN_WIDTH_20_NOHT:
933 sta_flags |= IEEE80211_STA_DISABLE_HT;
934 case NL80211_CHAN_WIDTH_20:
935 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
936 break;
937 default:
938 break;
939 }
940
941 memset(¶ms, 0, sizeof(params));
942 memset(&csa_ie, 0, sizeof(csa_ie));
943 err = ieee80211_parse_ch_switch_ie(sdata, elems, band,
944 sta_flags, sdata->vif.addr,
945 &csa_ie);
946 if (err < 0)
947 return false;
948 if (err)
949 return false;
950
951 params.chandef = csa_ie.chandef;
952 params.count = csa_ie.count;
953
954 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef,
955 IEEE80211_CHAN_DISABLED)) {
956 sdata_info(sdata,
957 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
958 sdata->vif.addr,
959 params.chandef.chan->center_freq,
960 params.chandef.width,
961 params.chandef.center_freq1,
962 params.chandef.center_freq2);
963 return false;
964 }
965
966 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
967 ¶ms.chandef,
968 NL80211_IFTYPE_MESH_POINT);
969 if (err < 0)
970 return false;
971 if (err > 0)
972 /* TODO: DFS not (yet) supported */
973 return false;
974
975 params.radar_required = err;
976
977 if (cfg80211_chandef_identical(¶ms.chandef,
978 &sdata->vif.bss_conf.chandef)) {
979 mcsa_dbg(sdata,
980 "received csa with an identical chandef, ignoring\n");
981 return true;
982 }
983
984 mcsa_dbg(sdata,
985 "received channel switch announcement to go to channel %d MHz\n",
986 params.chandef.chan->center_freq);
987
988 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
989 if (beacon) {
990 ifmsh->chsw_ttl = csa_ie.ttl - 1;
991 if (ifmsh->pre_value >= csa_ie.pre_value)
992 return false;
993 ifmsh->pre_value = csa_ie.pre_value;
994 }
995
996 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
997 return false;
998
999 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1000
1001 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1002 ¶ms) < 0)
1003 return false;
1004
1005 return true;
1006}
1007
1008static void
1009ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1010 struct ieee80211_mgmt *mgmt, size_t len)
1011{
1012 struct ieee80211_local *local = sdata->local;
1013 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1014 struct sk_buff *presp;
1015 struct beacon_data *bcn;
1016 struct ieee80211_mgmt *hdr;
1017 struct ieee802_11_elems elems;
1018 size_t baselen;
1019 u8 *pos;
1020
1021 pos = mgmt->u.probe_req.variable;
1022 baselen = (u8 *) pos - (u8 *) mgmt;
1023 if (baselen > len)
1024 return;
1025
1026 ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1027
1028 if (!elems.mesh_id)
1029 return;
1030
1031 /* 802.11-2012 10.1.4.3.2 */
1032 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1033 !is_broadcast_ether_addr(mgmt->da)) ||
1034 elems.ssid_len != 0)
1035 return;
1036
1037 if (elems.mesh_id_len != 0 &&
1038 (elems.mesh_id_len != ifmsh->mesh_id_len ||
1039 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1040 return;
1041
1042 rcu_read_lock();
1043 bcn = rcu_dereference(ifmsh->beacon);
1044
1045 if (!bcn)
1046 goto out;
1047
1048 presp = dev_alloc_skb(local->tx_headroom +
1049 bcn->head_len + bcn->tail_len);
1050 if (!presp)
1051 goto out;
1052
1053 skb_reserve(presp, local->tx_headroom);
1054 memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
1055 memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
1056 hdr = (struct ieee80211_mgmt *) presp->data;
1057 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1058 IEEE80211_STYPE_PROBE_RESP);
1059 memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1060 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1061 ieee80211_tx_skb(sdata, presp);
1062out:
1063 rcu_read_unlock();
1064}
1065
1066static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1067 u16 stype,
1068 struct ieee80211_mgmt *mgmt,
1069 size_t len,
1070 struct ieee80211_rx_status *rx_status)
1071{
1072 struct ieee80211_local *local = sdata->local;
1073 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1074 struct ieee802_11_elems elems;
1075 struct ieee80211_channel *channel;
1076 size_t baselen;
1077 int freq;
1078 enum nl80211_band band = rx_status->band;
1079
1080 /* ignore ProbeResp to foreign address */
1081 if (stype == IEEE80211_STYPE_PROBE_RESP &&
1082 !ether_addr_equal(mgmt->da, sdata->vif.addr))
1083 return;
1084
1085 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1086 if (baselen > len)
1087 return;
1088
1089 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1090 false, &elems);
1091
1092 /* ignore non-mesh or secure / unsecure mismatch */
1093 if ((!elems.mesh_id || !elems.mesh_config) ||
1094 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1095 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1096 return;
1097
1098 if (elems.ds_params)
1099 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1100 else
1101 freq = rx_status->freq;
1102
1103 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1104
1105 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1106 return;
1107
1108 if (mesh_matches_local(sdata, &elems))
1109 mesh_neighbour_update(sdata, mgmt->sa, &elems);
1110
1111 if (ifmsh->sync_ops)
1112 ifmsh->sync_ops->rx_bcn_presp(sdata,
1113 stype, mgmt, &elems, rx_status);
1114
1115 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1116 !sdata->vif.csa_active)
1117 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1118}
1119
1120int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1121{
1122 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1123 struct mesh_csa_settings *tmp_csa_settings;
1124 int ret = 0;
1125 int changed = 0;
1126
1127 /* Reset the TTL value and Initiator flag */
1128 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1129 ifmsh->chsw_ttl = 0;
1130
1131 /* Remove the CSA and MCSP elements from the beacon */
1132 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1133 RCU_INIT_POINTER(ifmsh->csa, NULL);
1134 if (tmp_csa_settings)
1135 kfree_rcu(tmp_csa_settings, rcu_head);
1136 ret = ieee80211_mesh_rebuild_beacon(sdata);
1137 if (ret)
1138 return -EINVAL;
1139
1140 changed |= BSS_CHANGED_BEACON;
1141
1142 mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1143 sdata->vif.bss_conf.chandef.chan->center_freq);
1144 return changed;
1145}
1146
1147int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1148 struct cfg80211_csa_settings *csa_settings)
1149{
1150 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1151 struct mesh_csa_settings *tmp_csa_settings;
1152 int ret = 0;
1153
1154 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1155 GFP_ATOMIC);
1156 if (!tmp_csa_settings)
1157 return -ENOMEM;
1158
1159 memcpy(&tmp_csa_settings->settings, csa_settings,
1160 sizeof(struct cfg80211_csa_settings));
1161
1162 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1163
1164 ret = ieee80211_mesh_rebuild_beacon(sdata);
1165 if (ret) {
1166 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1167 RCU_INIT_POINTER(ifmsh->csa, NULL);
1168 kfree_rcu(tmp_csa_settings, rcu_head);
1169 return ret;
1170 }
1171
1172 return BSS_CHANGED_BEACON;
1173}
1174
1175static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1176 struct ieee80211_mgmt *mgmt, size_t len)
1177{
1178 struct ieee80211_mgmt *mgmt_fwd;
1179 struct sk_buff *skb;
1180 struct ieee80211_local *local = sdata->local;
1181 u8 *pos = mgmt->u.action.u.chan_switch.variable;
1182 size_t offset_ttl;
1183
1184 skb = dev_alloc_skb(local->tx_headroom + len);
1185 if (!skb)
1186 return -ENOMEM;
1187 skb_reserve(skb, local->tx_headroom);
1188 mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len);
1189
1190 /* offset_ttl is based on whether the secondary channel
1191 * offset is available or not. Subtract 1 from the mesh TTL
1192 * and disable the initiator flag before forwarding.
1193 */
1194 offset_ttl = (len < 42) ? 7 : 10;
1195 *(pos + offset_ttl) -= 1;
1196 *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1197
1198 memcpy(mgmt_fwd, mgmt, len);
1199 eth_broadcast_addr(mgmt_fwd->da);
1200 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1201 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1202
1203 ieee80211_tx_skb(sdata, skb);
1204 return 0;
1205}
1206
1207static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1208 struct ieee80211_mgmt *mgmt, size_t len)
1209{
1210 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1211 struct ieee802_11_elems elems;
1212 u16 pre_value;
1213 bool fwd_csa = true;
1214 size_t baselen;
1215 u8 *pos;
1216
1217 if (mgmt->u.action.u.measurement.action_code !=
1218 WLAN_ACTION_SPCT_CHL_SWITCH)
1219 return;
1220
1221 pos = mgmt->u.action.u.chan_switch.variable;
1222 baselen = offsetof(struct ieee80211_mgmt,
1223 u.action.u.chan_switch.variable);
1224 ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1225
1226 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1227 if (!--ifmsh->chsw_ttl)
1228 fwd_csa = false;
1229
1230 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1231 if (ifmsh->pre_value >= pre_value)
1232 return;
1233
1234 ifmsh->pre_value = pre_value;
1235
1236 if (!sdata->vif.csa_active &&
1237 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1238 mcsa_dbg(sdata, "Failed to process CSA action frame");
1239 return;
1240 }
1241
1242 /* forward or re-broadcast the CSA frame */
1243 if (fwd_csa) {
1244 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0)
1245 mcsa_dbg(sdata, "Failed to forward the CSA frame");
1246 }
1247}
1248
1249static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1250 struct ieee80211_mgmt *mgmt,
1251 size_t len,
1252 struct ieee80211_rx_status *rx_status)
1253{
1254 switch (mgmt->u.action.category) {
1255 case WLAN_CATEGORY_SELF_PROTECTED:
1256 switch (mgmt->u.action.u.self_prot.action_code) {
1257 case WLAN_SP_MESH_PEERING_OPEN:
1258 case WLAN_SP_MESH_PEERING_CLOSE:
1259 case WLAN_SP_MESH_PEERING_CONFIRM:
1260 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1261 break;
1262 }
1263 break;
1264 case WLAN_CATEGORY_MESH_ACTION:
1265 if (mesh_action_is_path_sel(mgmt))
1266 mesh_rx_path_sel_frame(sdata, mgmt, len);
1267 break;
1268 case WLAN_CATEGORY_SPECTRUM_MGMT:
1269 mesh_rx_csa_frame(sdata, mgmt, len);
1270 break;
1271 }
1272}
1273
1274void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1275 struct sk_buff *skb)
1276{
1277 struct ieee80211_rx_status *rx_status;
1278 struct ieee80211_mgmt *mgmt;
1279 u16 stype;
1280
1281 sdata_lock(sdata);
1282
1283 /* mesh already went down */
1284 if (!sdata->u.mesh.mesh_id_len)
1285 goto out;
1286
1287 rx_status = IEEE80211_SKB_RXCB(skb);
1288 mgmt = (struct ieee80211_mgmt *) skb->data;
1289 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1290
1291 switch (stype) {
1292 case IEEE80211_STYPE_PROBE_RESP:
1293 case IEEE80211_STYPE_BEACON:
1294 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1295 rx_status);
1296 break;
1297 case IEEE80211_STYPE_PROBE_REQ:
1298 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1299 break;
1300 case IEEE80211_STYPE_ACTION:
1301 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1302 break;
1303 }
1304out:
1305 sdata_unlock(sdata);
1306}
1307
1308static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1309{
1310 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1311 u32 bit, changed = 0;
1312
1313 for_each_set_bit(bit, &ifmsh->mbss_changed,
1314 sizeof(changed) * BITS_PER_BYTE) {
1315 clear_bit(bit, &ifmsh->mbss_changed);
1316 changed |= BIT(bit);
1317 }
1318
1319 if (sdata->vif.bss_conf.enable_beacon &&
1320 (changed & (BSS_CHANGED_BEACON |
1321 BSS_CHANGED_HT |
1322 BSS_CHANGED_BASIC_RATES |
1323 BSS_CHANGED_BEACON_INT)))
1324 if (ieee80211_mesh_rebuild_beacon(sdata))
1325 return;
1326
1327 ieee80211_bss_info_change_notify(sdata, changed);
1328}
1329
1330void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1331{
1332 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1333
1334 sdata_lock(sdata);
1335
1336 /* mesh already went down */
1337 if (!sdata->u.mesh.mesh_id_len)
1338 goto out;
1339
1340 if (ifmsh->preq_queue_len &&
1341 time_after(jiffies,
1342 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1343 mesh_path_start_discovery(sdata);
1344
1345 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1346 ieee80211_mesh_housekeeping(sdata);
1347
1348 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1349 ieee80211_mesh_rootpath(sdata);
1350
1351 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1352 mesh_sync_adjust_tbtt(sdata);
1353
1354 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1355 mesh_bss_info_changed(sdata);
1356out:
1357 sdata_unlock(sdata);
1358}
1359
1360
1361void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1362{
1363 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1364 static u8 zero_addr[ETH_ALEN] = {};
1365
1366 setup_timer(&ifmsh->housekeeping_timer,
1367 ieee80211_mesh_housekeeping_timer,
1368 (unsigned long) sdata);
1369
1370 ifmsh->accepting_plinks = true;
1371 atomic_set(&ifmsh->mpaths, 0);
1372 mesh_rmc_init(sdata);
1373 ifmsh->last_preq = jiffies;
1374 ifmsh->next_perr = jiffies;
1375 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1376 /* Allocate all mesh structures when creating the first mesh interface. */
1377 if (!mesh_allocated)
1378 ieee80211s_init();
1379
1380 mesh_pathtbl_init(sdata);
1381
1382 setup_timer(&ifmsh->mesh_path_timer,
1383 ieee80211_mesh_path_timer,
1384 (unsigned long) sdata);
1385 setup_timer(&ifmsh->mesh_path_root_timer,
1386 ieee80211_mesh_path_root_timer,
1387 (unsigned long) sdata);
1388 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1389 skb_queue_head_init(&ifmsh->ps.bc_buf);
1390 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1391 spin_lock_init(&ifmsh->sync_offset_lock);
1392 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1393
1394 sdata->vif.bss_conf.bssid = zero_addr;
1395}
1396
1397void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1398{
1399 mesh_rmc_free(sdata);
1400 mesh_pathtbl_unregister(sdata);
1401}
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
17static int mesh_allocated;
18static struct kmem_cache *rm_cache;
19
20bool 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
26void ieee80211s_init(void)
27{
28 mesh_pathtbl_init();
29 mesh_allocated = 1;
30 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
31 0, 0, NULL);
32}
33
34void ieee80211s_stop(void)
35{
36 if (!mesh_allocated)
37 return;
38 mesh_pathtbl_unregister();
39 kmem_cache_destroy(rm_cache);
40}
41
42static void ieee80211_mesh_housekeeping_timer(unsigned long data)
43{
44 struct ieee80211_sub_if_data *sdata = (void *) data;
45 struct ieee80211_local *local = sdata->local;
46 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
47
48 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
49
50 ieee80211_queue_work(&local->hw, &sdata->work);
51}
52
53/**
54 * mesh_matches_local - check if the config of a mesh point matches ours
55 *
56 * @sdata: local mesh subif
57 * @ie: information elements of a management frame from the mesh peer
58 *
59 * This function checks if the mesh configuration of a mesh point matches the
60 * local mesh configuration, i.e. if both nodes belong to the same mesh network.
61 */
62bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
63 struct ieee802_11_elems *ie)
64{
65 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
66 u32 basic_rates = 0;
67 struct cfg80211_chan_def sta_chan_def;
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 ieee80211_sta_get_rates(sdata, ie, ieee80211_get_sdata_band(sdata),
89 &basic_rates);
90
91 if (sdata->vif.bss_conf.basic_rates != basic_rates)
92 return false;
93
94 cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
95 NL80211_CHAN_NO_HT);
96 ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
97 ieee80211_chandef_vht_oper(ie->vht_operation, &sta_chan_def);
98
99 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
100 &sta_chan_def))
101 return false;
102
103 return true;
104}
105
106/**
107 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
108 *
109 * @ie: information elements of a management frame from the mesh peer
110 */
111bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
112{
113 return (ie->mesh_config->meshconf_cap &
114 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
115}
116
117/**
118 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
119 *
120 * @sdata: mesh interface in which mesh beacons are going to be updated
121 *
122 * Returns: beacon changed flag if the beacon content changed.
123 */
124u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
125{
126 bool free_plinks;
127 u32 changed = 0;
128
129 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
130 * the mesh interface might be able to establish plinks with peers that
131 * are already on the table but are not on PLINK_ESTAB state. However,
132 * in general the mesh interface is not accepting peer link requests
133 * from new peers, and that must be reflected in the beacon
134 */
135 free_plinks = mesh_plink_availables(sdata);
136
137 if (free_plinks != sdata->u.mesh.accepting_plinks) {
138 sdata->u.mesh.accepting_plinks = free_plinks;
139 changed = BSS_CHANGED_BEACON;
140 }
141
142 return changed;
143}
144
145/*
146 * mesh_sta_cleanup - clean up any mesh sta state
147 *
148 * @sta: mesh sta to clean up.
149 */
150void mesh_sta_cleanup(struct sta_info *sta)
151{
152 struct ieee80211_sub_if_data *sdata = sta->sdata;
153 u32 changed;
154
155 /*
156 * maybe userspace handles peer allocation and peering, but in either
157 * case the beacon is still generated by the kernel and we might need
158 * an update.
159 */
160 changed = mesh_accept_plinks_update(sdata);
161 if (!sdata->u.mesh.user_mpm) {
162 changed |= mesh_plink_deactivate(sta);
163 del_timer_sync(&sta->mesh->plink_timer);
164 }
165
166 if (changed)
167 ieee80211_mbss_info_change_notify(sdata, changed);
168}
169
170int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
171{
172 int i;
173
174 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
175 if (!sdata->u.mesh.rmc)
176 return -ENOMEM;
177 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
178 for (i = 0; i < RMC_BUCKETS; i++)
179 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
180 return 0;
181}
182
183void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
184{
185 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
186 struct rmc_entry *p, *n;
187 int i;
188
189 if (!sdata->u.mesh.rmc)
190 return;
191
192 for (i = 0; i < RMC_BUCKETS; i++) {
193 list_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
194 list_del(&p->list);
195 kmem_cache_free(rm_cache, p);
196 }
197 }
198
199 kfree(rmc);
200 sdata->u.mesh.rmc = NULL;
201}
202
203/**
204 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
205 *
206 * @sdata: interface
207 * @sa: source address
208 * @mesh_hdr: mesh_header
209 *
210 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
211 *
212 * Checks using the source address and the mesh sequence number if we have
213 * received this frame lately. If the frame is not in the cache, it is added to
214 * it.
215 */
216int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
217 const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
218{
219 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
220 u32 seqnum = 0;
221 int entries = 0;
222 u8 idx;
223 struct rmc_entry *p, *n;
224
225 /* Don't care about endianness since only match matters */
226 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
227 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
228 list_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
229 ++entries;
230 if (time_after(jiffies, p->exp_time) ||
231 entries == RMC_QUEUE_MAX_LEN) {
232 list_del(&p->list);
233 kmem_cache_free(rm_cache, p);
234 --entries;
235 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
236 return -1;
237 }
238
239 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
240 if (!p)
241 return 0;
242
243 p->seqnum = seqnum;
244 p->exp_time = jiffies + RMC_TIMEOUT;
245 memcpy(p->sa, sa, ETH_ALEN);
246 list_add(&p->list, &rmc->bucket[idx]);
247 return 0;
248}
249
250int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
251 struct sk_buff *skb)
252{
253 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
254 u8 *pos, neighbors;
255 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
256
257 if (skb_tailroom(skb) < 2 + meshconf_len)
258 return -ENOMEM;
259
260 pos = skb_put(skb, 2 + meshconf_len);
261 *pos++ = WLAN_EID_MESH_CONFIG;
262 *pos++ = meshconf_len;
263
264 /* save a pointer for quick updates in pre-tbtt */
265 ifmsh->meshconf_offset = pos - skb->data;
266
267 /* Active path selection protocol ID */
268 *pos++ = ifmsh->mesh_pp_id;
269 /* Active path selection metric ID */
270 *pos++ = ifmsh->mesh_pm_id;
271 /* Congestion control mode identifier */
272 *pos++ = ifmsh->mesh_cc_id;
273 /* Synchronization protocol identifier */
274 *pos++ = ifmsh->mesh_sp_id;
275 /* Authentication Protocol identifier */
276 *pos++ = ifmsh->mesh_auth_id;
277 /* Mesh Formation Info - number of neighbors */
278 neighbors = atomic_read(&ifmsh->estab_plinks);
279 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
280 *pos++ = neighbors << 1;
281 /* Mesh capability */
282 *pos = 0x00;
283 *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
284 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
285 *pos |= ifmsh->accepting_plinks ?
286 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
287 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
288 *pos |= ifmsh->ps_peers_deep_sleep ?
289 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
290 *pos++ |= ifmsh->adjusting_tbtt ?
291 IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
292 *pos++ = 0x00;
293
294 return 0;
295}
296
297int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
298{
299 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
300 u8 *pos;
301
302 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
303 return -ENOMEM;
304
305 pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
306 *pos++ = WLAN_EID_MESH_ID;
307 *pos++ = ifmsh->mesh_id_len;
308 if (ifmsh->mesh_id_len)
309 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
310
311 return 0;
312}
313
314static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
315 struct sk_buff *skb)
316{
317 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
318 u8 *pos;
319
320 /* see IEEE802.11-2012 13.14.6 */
321 if (ifmsh->ps_peers_light_sleep == 0 &&
322 ifmsh->ps_peers_deep_sleep == 0 &&
323 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
324 return 0;
325
326 if (skb_tailroom(skb) < 4)
327 return -ENOMEM;
328
329 pos = skb_put(skb, 2 + 2);
330 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
331 *pos++ = 2;
332 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
333
334 return 0;
335}
336
337int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
338 struct sk_buff *skb)
339{
340 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
341 u8 offset, len;
342 const u8 *data;
343
344 if (!ifmsh->ie || !ifmsh->ie_len)
345 return 0;
346
347 /* fast-forward to vendor IEs */
348 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
349
350 if (offset) {
351 len = ifmsh->ie_len - offset;
352 data = ifmsh->ie + offset;
353 if (skb_tailroom(skb) < len)
354 return -ENOMEM;
355 memcpy(skb_put(skb, len), data, len);
356 }
357
358 return 0;
359}
360
361int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
362{
363 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
364 u8 len = 0;
365 const u8 *data;
366
367 if (!ifmsh->ie || !ifmsh->ie_len)
368 return 0;
369
370 /* find RSN IE */
371 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
372 if (!data)
373 return 0;
374
375 len = data[1] + 2;
376
377 if (skb_tailroom(skb) < len)
378 return -ENOMEM;
379 memcpy(skb_put(skb, len), data, len);
380
381 return 0;
382}
383
384static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
385 struct sk_buff *skb)
386{
387 struct ieee80211_chanctx_conf *chanctx_conf;
388 struct ieee80211_channel *chan;
389 u8 *pos;
390
391 if (skb_tailroom(skb) < 3)
392 return -ENOMEM;
393
394 rcu_read_lock();
395 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
396 if (WARN_ON(!chanctx_conf)) {
397 rcu_read_unlock();
398 return -EINVAL;
399 }
400 chan = chanctx_conf->def.chan;
401 rcu_read_unlock();
402
403 pos = skb_put(skb, 2 + 1);
404 *pos++ = WLAN_EID_DS_PARAMS;
405 *pos++ = 1;
406 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
407
408 return 0;
409}
410
411int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
412 struct sk_buff *skb)
413{
414 struct ieee80211_local *local = sdata->local;
415 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
416 struct ieee80211_supported_band *sband;
417 u8 *pos;
418
419 sband = local->hw.wiphy->bands[band];
420 if (!sband->ht_cap.ht_supported ||
421 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
422 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
423 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
424 return 0;
425
426 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
427 return -ENOMEM;
428
429 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
430 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
431
432 return 0;
433}
434
435int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
436 struct sk_buff *skb)
437{
438 struct ieee80211_local *local = sdata->local;
439 struct ieee80211_chanctx_conf *chanctx_conf;
440 struct ieee80211_channel *channel;
441 struct ieee80211_supported_band *sband;
442 struct ieee80211_sta_ht_cap *ht_cap;
443 u8 *pos;
444
445 rcu_read_lock();
446 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
447 if (WARN_ON(!chanctx_conf)) {
448 rcu_read_unlock();
449 return -EINVAL;
450 }
451 channel = chanctx_conf->def.chan;
452 rcu_read_unlock();
453
454 sband = local->hw.wiphy->bands[channel->band];
455 ht_cap = &sband->ht_cap;
456
457 if (!ht_cap->ht_supported ||
458 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
459 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
460 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
461 return 0;
462
463 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
464 return -ENOMEM;
465
466 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
467 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
468 sdata->vif.bss_conf.ht_operation_mode,
469 false);
470
471 return 0;
472}
473
474int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
475 struct sk_buff *skb)
476{
477 struct ieee80211_local *local = sdata->local;
478 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
479 struct ieee80211_supported_band *sband;
480 u8 *pos;
481
482 sband = local->hw.wiphy->bands[band];
483 if (!sband->vht_cap.vht_supported ||
484 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
485 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
486 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
487 return 0;
488
489 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
490 return -ENOMEM;
491
492 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
493 ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
494
495 return 0;
496}
497
498int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
499 struct sk_buff *skb)
500{
501 struct ieee80211_local *local = sdata->local;
502 struct ieee80211_chanctx_conf *chanctx_conf;
503 struct ieee80211_channel *channel;
504 struct ieee80211_supported_band *sband;
505 struct ieee80211_sta_vht_cap *vht_cap;
506 u8 *pos;
507
508 rcu_read_lock();
509 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
510 if (WARN_ON(!chanctx_conf)) {
511 rcu_read_unlock();
512 return -EINVAL;
513 }
514 channel = chanctx_conf->def.chan;
515 rcu_read_unlock();
516
517 sband = local->hw.wiphy->bands[channel->band];
518 vht_cap = &sband->vht_cap;
519
520 if (!vht_cap->vht_supported ||
521 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
522 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
523 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
524 return 0;
525
526 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
527 return -ENOMEM;
528
529 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
530 ieee80211_ie_build_vht_oper(pos, vht_cap,
531 &sdata->vif.bss_conf.chandef);
532
533 return 0;
534}
535
536static void ieee80211_mesh_path_timer(unsigned long data)
537{
538 struct ieee80211_sub_if_data *sdata =
539 (struct ieee80211_sub_if_data *) data;
540
541 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
542}
543
544static void ieee80211_mesh_path_root_timer(unsigned long data)
545{
546 struct ieee80211_sub_if_data *sdata =
547 (struct ieee80211_sub_if_data *) data;
548 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
549
550 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
551
552 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
553}
554
555void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
556{
557 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
558 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
559 else {
560 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
561 /* stop running timer */
562 del_timer_sync(&ifmsh->mesh_path_root_timer);
563 }
564}
565
566/**
567 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
568 * @hdr: 802.11 frame header
569 * @fc: frame control field
570 * @meshda: destination address in the mesh
571 * @meshsa: source address address in the mesh. Same as TA, as frame is
572 * locally originated.
573 *
574 * Return the length of the 802.11 (does not include a mesh control header)
575 */
576int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
577 const u8 *meshda, const u8 *meshsa)
578{
579 if (is_multicast_ether_addr(meshda)) {
580 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
581 /* DA TA SA */
582 memcpy(hdr->addr1, meshda, ETH_ALEN);
583 memcpy(hdr->addr2, meshsa, ETH_ALEN);
584 memcpy(hdr->addr3, meshsa, ETH_ALEN);
585 return 24;
586 } else {
587 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
588 /* RA TA DA SA */
589 eth_zero_addr(hdr->addr1); /* RA is resolved later */
590 memcpy(hdr->addr2, meshsa, ETH_ALEN);
591 memcpy(hdr->addr3, meshda, ETH_ALEN);
592 memcpy(hdr->addr4, meshsa, ETH_ALEN);
593 return 30;
594 }
595}
596
597/**
598 * ieee80211_new_mesh_header - create a new mesh header
599 * @sdata: mesh interface to be used
600 * @meshhdr: uninitialized mesh header
601 * @addr4or5: 1st address in the ae header, which may correspond to address 4
602 * (if addr6 is NULL) or address 5 (if addr6 is present). It may
603 * be NULL.
604 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
605 * mesh frame
606 *
607 * Return the header length.
608 */
609unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
610 struct ieee80211s_hdr *meshhdr,
611 const char *addr4or5, const char *addr6)
612{
613 if (WARN_ON(!addr4or5 && addr6))
614 return 0;
615
616 memset(meshhdr, 0, sizeof(*meshhdr));
617
618 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
619
620 /* FIXME: racy -- TX on multiple queues can be concurrent */
621 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
622 sdata->u.mesh.mesh_seqnum++;
623
624 if (addr4or5 && !addr6) {
625 meshhdr->flags |= MESH_FLAGS_AE_A4;
626 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
627 return 2 * ETH_ALEN;
628 } else if (addr4or5 && addr6) {
629 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
630 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
631 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
632 return 3 * ETH_ALEN;
633 }
634
635 return ETH_ALEN;
636}
637
638static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
639{
640 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
641 u32 changed;
642
643 if (ifmsh->mshcfg.plink_timeout > 0)
644 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
645 mesh_path_expire(sdata);
646
647 changed = mesh_accept_plinks_update(sdata);
648 ieee80211_mbss_info_change_notify(sdata, changed);
649
650 mod_timer(&ifmsh->housekeeping_timer,
651 round_jiffies(jiffies +
652 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
653}
654
655static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
656{
657 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
658 u32 interval;
659
660 mesh_path_tx_root_frame(sdata);
661
662 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
663 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
664 else
665 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
666
667 mod_timer(&ifmsh->mesh_path_root_timer,
668 round_jiffies(TU_TO_EXP_TIME(interval)));
669}
670
671static int
672ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
673{
674 struct beacon_data *bcn;
675 int head_len, tail_len;
676 struct sk_buff *skb;
677 struct ieee80211_mgmt *mgmt;
678 struct ieee80211_chanctx_conf *chanctx_conf;
679 struct mesh_csa_settings *csa;
680 enum ieee80211_band band;
681 u8 *pos;
682 struct ieee80211_sub_if_data *sdata;
683 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
684 sizeof(mgmt->u.beacon);
685
686 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
687 rcu_read_lock();
688 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
689 band = chanctx_conf->def.chan->band;
690 rcu_read_unlock();
691
692 head_len = hdr_len +
693 2 + /* NULL SSID */
694 /* Channel Switch Announcement */
695 2 + sizeof(struct ieee80211_channel_sw_ie) +
696 /* Mesh Channel Swith Parameters */
697 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
698 2 + 8 + /* supported rates */
699 2 + 3; /* DS params */
700 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
701 2 + sizeof(struct ieee80211_ht_cap) +
702 2 + sizeof(struct ieee80211_ht_operation) +
703 2 + ifmsh->mesh_id_len +
704 2 + sizeof(struct ieee80211_meshconf_ie) +
705 2 + sizeof(__le16) + /* awake window */
706 2 + sizeof(struct ieee80211_vht_cap) +
707 2 + sizeof(struct ieee80211_vht_operation) +
708 ifmsh->ie_len;
709
710 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
711 /* need an skb for IE builders to operate on */
712 skb = dev_alloc_skb(max(head_len, tail_len));
713
714 if (!bcn || !skb)
715 goto out_free;
716
717 /*
718 * pointers go into the block we allocated,
719 * memory is | beacon_data | head | tail |
720 */
721 bcn->head = ((u8 *) bcn) + sizeof(*bcn);
722
723 /* fill in the head */
724 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
725 memset(mgmt, 0, hdr_len);
726 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
727 IEEE80211_STYPE_BEACON);
728 eth_broadcast_addr(mgmt->da);
729 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
730 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
731 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
732 mgmt->u.beacon.beacon_int =
733 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
734 mgmt->u.beacon.capab_info |= cpu_to_le16(
735 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
736
737 pos = skb_put(skb, 2);
738 *pos++ = WLAN_EID_SSID;
739 *pos++ = 0x0;
740
741 rcu_read_lock();
742 csa = rcu_dereference(ifmsh->csa);
743 if (csa) {
744 pos = skb_put(skb, 13);
745 memset(pos, 0, 13);
746 *pos++ = WLAN_EID_CHANNEL_SWITCH;
747 *pos++ = 3;
748 *pos++ = 0x0;
749 *pos++ = ieee80211_frequency_to_channel(
750 csa->settings.chandef.chan->center_freq);
751 bcn->csa_current_counter = csa->settings.count;
752 bcn->csa_counter_offsets[0] = hdr_len + 6;
753 *pos++ = csa->settings.count;
754 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
755 *pos++ = 6;
756 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
757 *pos++ = ifmsh->mshcfg.dot11MeshTTL;
758 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
759 } else {
760 *pos++ = ifmsh->chsw_ttl;
761 }
762 *pos++ |= csa->settings.block_tx ?
763 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
764 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
765 pos += 2;
766 put_unaligned_le16(ifmsh->pre_value, pos);
767 pos += 2;
768 }
769 rcu_read_unlock();
770
771 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
772 mesh_add_ds_params_ie(sdata, skb))
773 goto out_free;
774
775 bcn->head_len = skb->len;
776 memcpy(bcn->head, skb->data, bcn->head_len);
777
778 /* now the tail */
779 skb_trim(skb, 0);
780 bcn->tail = bcn->head + bcn->head_len;
781
782 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
783 mesh_add_rsn_ie(sdata, skb) ||
784 mesh_add_ht_cap_ie(sdata, skb) ||
785 mesh_add_ht_oper_ie(sdata, skb) ||
786 mesh_add_meshid_ie(sdata, skb) ||
787 mesh_add_meshconf_ie(sdata, skb) ||
788 mesh_add_awake_window_ie(sdata, skb) ||
789 mesh_add_vht_cap_ie(sdata, skb) ||
790 mesh_add_vht_oper_ie(sdata, skb) ||
791 mesh_add_vendor_ies(sdata, skb))
792 goto out_free;
793
794 bcn->tail_len = skb->len;
795 memcpy(bcn->tail, skb->data, bcn->tail_len);
796 bcn->meshconf = (struct ieee80211_meshconf_ie *)
797 (bcn->tail + ifmsh->meshconf_offset);
798
799 dev_kfree_skb(skb);
800 rcu_assign_pointer(ifmsh->beacon, bcn);
801 return 0;
802out_free:
803 kfree(bcn);
804 dev_kfree_skb(skb);
805 return -ENOMEM;
806}
807
808static int
809ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
810{
811 struct beacon_data *old_bcn;
812 int ret;
813
814 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
815 lockdep_is_held(&sdata->wdev.mtx));
816 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
817 if (ret)
818 /* just reuse old beacon */
819 return ret;
820
821 if (old_bcn)
822 kfree_rcu(old_bcn, rcu_head);
823 return 0;
824}
825
826void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
827 u32 changed)
828{
829 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
830 unsigned long bits = changed;
831 u32 bit;
832
833 if (!bits)
834 return;
835
836 /* if we race with running work, worst case this work becomes a noop */
837 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
838 set_bit(bit, &ifmsh->mbss_changed);
839 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
840 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
841}
842
843int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
844{
845 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
846 struct ieee80211_local *local = sdata->local;
847 u32 changed = BSS_CHANGED_BEACON |
848 BSS_CHANGED_BEACON_ENABLED |
849 BSS_CHANGED_HT |
850 BSS_CHANGED_BASIC_RATES |
851 BSS_CHANGED_BEACON_INT;
852
853 local->fif_other_bss++;
854 /* mesh ifaces must set allmulti to forward mcast traffic */
855 atomic_inc(&local->iff_allmultis);
856 ieee80211_configure_filter(local);
857
858 ifmsh->mesh_cc_id = 0; /* Disabled */
859 /* register sync ops from extensible synchronization framework */
860 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
861 ifmsh->adjusting_tbtt = false;
862 ifmsh->sync_offset_clockdrift_max = 0;
863 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
864 ieee80211_mesh_root_setup(ifmsh);
865 ieee80211_queue_work(&local->hw, &sdata->work);
866 sdata->vif.bss_conf.ht_operation_mode =
867 ifmsh->mshcfg.ht_opmode;
868 sdata->vif.bss_conf.enable_beacon = true;
869
870 changed |= ieee80211_mps_local_status_update(sdata);
871
872 if (ieee80211_mesh_build_beacon(ifmsh)) {
873 ieee80211_stop_mesh(sdata);
874 return -ENOMEM;
875 }
876
877 ieee80211_recalc_dtim(local, sdata);
878 ieee80211_bss_info_change_notify(sdata, changed);
879
880 netif_carrier_on(sdata->dev);
881 return 0;
882}
883
884void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
885{
886 struct ieee80211_local *local = sdata->local;
887 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
888 struct beacon_data *bcn;
889
890 netif_carrier_off(sdata->dev);
891
892 /* stop the beacon */
893 ifmsh->mesh_id_len = 0;
894 sdata->vif.bss_conf.enable_beacon = false;
895 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
896 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
897 bcn = rcu_dereference_protected(ifmsh->beacon,
898 lockdep_is_held(&sdata->wdev.mtx));
899 RCU_INIT_POINTER(ifmsh->beacon, NULL);
900 kfree_rcu(bcn, rcu_head);
901
902 /* flush STAs and mpaths on this iface */
903 sta_info_flush(sdata);
904 mesh_path_flush_by_iface(sdata);
905
906 /* free all potentially still buffered group-addressed frames */
907 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
908 skb_queue_purge(&ifmsh->ps.bc_buf);
909
910 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
911 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
912 del_timer_sync(&sdata->u.mesh.mesh_path_timer);
913
914 /* clear any mesh work (for next join) we may have accrued */
915 ifmsh->wrkq_flags = 0;
916 ifmsh->mbss_changed = 0;
917
918 local->fif_other_bss--;
919 atomic_dec(&local->iff_allmultis);
920 ieee80211_configure_filter(local);
921}
922
923static bool
924ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
925 struct ieee802_11_elems *elems, bool beacon)
926{
927 struct cfg80211_csa_settings params;
928 struct ieee80211_csa_ie csa_ie;
929 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
930 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
931 int err;
932 u32 sta_flags;
933
934 sdata_assert_lock(sdata);
935
936 sta_flags = IEEE80211_STA_DISABLE_VHT;
937 switch (sdata->vif.bss_conf.chandef.width) {
938 case NL80211_CHAN_WIDTH_20_NOHT:
939 sta_flags |= IEEE80211_STA_DISABLE_HT;
940 case NL80211_CHAN_WIDTH_20:
941 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
942 break;
943 default:
944 break;
945 }
946
947 memset(¶ms, 0, sizeof(params));
948 memset(&csa_ie, 0, sizeof(csa_ie));
949 err = ieee80211_parse_ch_switch_ie(sdata, elems, band,
950 sta_flags, sdata->vif.addr,
951 &csa_ie);
952 if (err < 0)
953 return false;
954 if (err)
955 return false;
956
957 params.chandef = csa_ie.chandef;
958 params.count = csa_ie.count;
959
960 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef,
961 IEEE80211_CHAN_DISABLED)) {
962 sdata_info(sdata,
963 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
964 sdata->vif.addr,
965 params.chandef.chan->center_freq,
966 params.chandef.width,
967 params.chandef.center_freq1,
968 params.chandef.center_freq2);
969 return false;
970 }
971
972 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
973 ¶ms.chandef,
974 NL80211_IFTYPE_MESH_POINT);
975 if (err < 0)
976 return false;
977 if (err > 0)
978 /* TODO: DFS not (yet) supported */
979 return false;
980
981 params.radar_required = err;
982
983 if (cfg80211_chandef_identical(¶ms.chandef,
984 &sdata->vif.bss_conf.chandef)) {
985 mcsa_dbg(sdata,
986 "received csa with an identical chandef, ignoring\n");
987 return true;
988 }
989
990 mcsa_dbg(sdata,
991 "received channel switch announcement to go to channel %d MHz\n",
992 params.chandef.chan->center_freq);
993
994 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
995 if (beacon) {
996 ifmsh->chsw_ttl = csa_ie.ttl - 1;
997 if (ifmsh->pre_value >= csa_ie.pre_value)
998 return false;
999 ifmsh->pre_value = csa_ie.pre_value;
1000 }
1001
1002 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1003 return false;
1004
1005 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1006
1007 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1008 ¶ms) < 0)
1009 return false;
1010
1011 return true;
1012}
1013
1014static void
1015ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1016 struct ieee80211_mgmt *mgmt, size_t len)
1017{
1018 struct ieee80211_local *local = sdata->local;
1019 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1020 struct sk_buff *presp;
1021 struct beacon_data *bcn;
1022 struct ieee80211_mgmt *hdr;
1023 struct ieee802_11_elems elems;
1024 size_t baselen;
1025 u8 *pos;
1026
1027 pos = mgmt->u.probe_req.variable;
1028 baselen = (u8 *) pos - (u8 *) mgmt;
1029 if (baselen > len)
1030 return;
1031
1032 ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1033
1034 if (!elems.mesh_id)
1035 return;
1036
1037 /* 802.11-2012 10.1.4.3.2 */
1038 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1039 !is_broadcast_ether_addr(mgmt->da)) ||
1040 elems.ssid_len != 0)
1041 return;
1042
1043 if (elems.mesh_id_len != 0 &&
1044 (elems.mesh_id_len != ifmsh->mesh_id_len ||
1045 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1046 return;
1047
1048 rcu_read_lock();
1049 bcn = rcu_dereference(ifmsh->beacon);
1050
1051 if (!bcn)
1052 goto out;
1053
1054 presp = dev_alloc_skb(local->tx_headroom +
1055 bcn->head_len + bcn->tail_len);
1056 if (!presp)
1057 goto out;
1058
1059 skb_reserve(presp, local->tx_headroom);
1060 memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
1061 memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
1062 hdr = (struct ieee80211_mgmt *) presp->data;
1063 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1064 IEEE80211_STYPE_PROBE_RESP);
1065 memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1066 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1067 ieee80211_tx_skb(sdata, presp);
1068out:
1069 rcu_read_unlock();
1070}
1071
1072static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1073 u16 stype,
1074 struct ieee80211_mgmt *mgmt,
1075 size_t len,
1076 struct ieee80211_rx_status *rx_status)
1077{
1078 struct ieee80211_local *local = sdata->local;
1079 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1080 struct ieee802_11_elems elems;
1081 struct ieee80211_channel *channel;
1082 size_t baselen;
1083 int freq;
1084 enum ieee80211_band band = rx_status->band;
1085
1086 /* ignore ProbeResp to foreign address */
1087 if (stype == IEEE80211_STYPE_PROBE_RESP &&
1088 !ether_addr_equal(mgmt->da, sdata->vif.addr))
1089 return;
1090
1091 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1092 if (baselen > len)
1093 return;
1094
1095 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1096 false, &elems);
1097
1098 /* ignore non-mesh or secure / unsecure mismatch */
1099 if ((!elems.mesh_id || !elems.mesh_config) ||
1100 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1101 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1102 return;
1103
1104 if (elems.ds_params)
1105 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1106 else
1107 freq = rx_status->freq;
1108
1109 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1110
1111 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1112 return;
1113
1114 if (mesh_matches_local(sdata, &elems))
1115 mesh_neighbour_update(sdata, mgmt->sa, &elems);
1116
1117 if (ifmsh->sync_ops)
1118 ifmsh->sync_ops->rx_bcn_presp(sdata,
1119 stype, mgmt, &elems, rx_status);
1120
1121 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1122 !sdata->vif.csa_active)
1123 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1124}
1125
1126int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1127{
1128 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1129 struct mesh_csa_settings *tmp_csa_settings;
1130 int ret = 0;
1131 int changed = 0;
1132
1133 /* Reset the TTL value and Initiator flag */
1134 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1135 ifmsh->chsw_ttl = 0;
1136
1137 /* Remove the CSA and MCSP elements from the beacon */
1138 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1139 RCU_INIT_POINTER(ifmsh->csa, NULL);
1140 if (tmp_csa_settings)
1141 kfree_rcu(tmp_csa_settings, rcu_head);
1142 ret = ieee80211_mesh_rebuild_beacon(sdata);
1143 if (ret)
1144 return -EINVAL;
1145
1146 changed |= BSS_CHANGED_BEACON;
1147
1148 mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1149 sdata->vif.bss_conf.chandef.chan->center_freq);
1150 return changed;
1151}
1152
1153int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1154 struct cfg80211_csa_settings *csa_settings)
1155{
1156 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1157 struct mesh_csa_settings *tmp_csa_settings;
1158 int ret = 0;
1159
1160 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1161 GFP_ATOMIC);
1162 if (!tmp_csa_settings)
1163 return -ENOMEM;
1164
1165 memcpy(&tmp_csa_settings->settings, csa_settings,
1166 sizeof(struct cfg80211_csa_settings));
1167
1168 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1169
1170 ret = ieee80211_mesh_rebuild_beacon(sdata);
1171 if (ret) {
1172 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1173 RCU_INIT_POINTER(ifmsh->csa, NULL);
1174 kfree_rcu(tmp_csa_settings, rcu_head);
1175 return ret;
1176 }
1177
1178 return BSS_CHANGED_BEACON;
1179}
1180
1181static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1182 struct ieee80211_mgmt *mgmt, size_t len)
1183{
1184 struct ieee80211_mgmt *mgmt_fwd;
1185 struct sk_buff *skb;
1186 struct ieee80211_local *local = sdata->local;
1187 u8 *pos = mgmt->u.action.u.chan_switch.variable;
1188 size_t offset_ttl;
1189
1190 skb = dev_alloc_skb(local->tx_headroom + len);
1191 if (!skb)
1192 return -ENOMEM;
1193 skb_reserve(skb, local->tx_headroom);
1194 mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len);
1195
1196 /* offset_ttl is based on whether the secondary channel
1197 * offset is available or not. Subtract 1 from the mesh TTL
1198 * and disable the initiator flag before forwarding.
1199 */
1200 offset_ttl = (len < 42) ? 7 : 10;
1201 *(pos + offset_ttl) -= 1;
1202 *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1203
1204 memcpy(mgmt_fwd, mgmt, len);
1205 eth_broadcast_addr(mgmt_fwd->da);
1206 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1207 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1208
1209 ieee80211_tx_skb(sdata, skb);
1210 return 0;
1211}
1212
1213static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1214 struct ieee80211_mgmt *mgmt, size_t len)
1215{
1216 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1217 struct ieee802_11_elems elems;
1218 u16 pre_value;
1219 bool fwd_csa = true;
1220 size_t baselen;
1221 u8 *pos;
1222
1223 if (mgmt->u.action.u.measurement.action_code !=
1224 WLAN_ACTION_SPCT_CHL_SWITCH)
1225 return;
1226
1227 pos = mgmt->u.action.u.chan_switch.variable;
1228 baselen = offsetof(struct ieee80211_mgmt,
1229 u.action.u.chan_switch.variable);
1230 ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1231
1232 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1233 if (!--ifmsh->chsw_ttl)
1234 fwd_csa = false;
1235
1236 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1237 if (ifmsh->pre_value >= pre_value)
1238 return;
1239
1240 ifmsh->pre_value = pre_value;
1241
1242 if (!sdata->vif.csa_active &&
1243 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1244 mcsa_dbg(sdata, "Failed to process CSA action frame");
1245 return;
1246 }
1247
1248 /* forward or re-broadcast the CSA frame */
1249 if (fwd_csa) {
1250 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0)
1251 mcsa_dbg(sdata, "Failed to forward the CSA frame");
1252 }
1253}
1254
1255static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1256 struct ieee80211_mgmt *mgmt,
1257 size_t len,
1258 struct ieee80211_rx_status *rx_status)
1259{
1260 switch (mgmt->u.action.category) {
1261 case WLAN_CATEGORY_SELF_PROTECTED:
1262 switch (mgmt->u.action.u.self_prot.action_code) {
1263 case WLAN_SP_MESH_PEERING_OPEN:
1264 case WLAN_SP_MESH_PEERING_CLOSE:
1265 case WLAN_SP_MESH_PEERING_CONFIRM:
1266 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1267 break;
1268 }
1269 break;
1270 case WLAN_CATEGORY_MESH_ACTION:
1271 if (mesh_action_is_path_sel(mgmt))
1272 mesh_rx_path_sel_frame(sdata, mgmt, len);
1273 break;
1274 case WLAN_CATEGORY_SPECTRUM_MGMT:
1275 mesh_rx_csa_frame(sdata, mgmt, len);
1276 break;
1277 }
1278}
1279
1280void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1281 struct sk_buff *skb)
1282{
1283 struct ieee80211_rx_status *rx_status;
1284 struct ieee80211_mgmt *mgmt;
1285 u16 stype;
1286
1287 sdata_lock(sdata);
1288
1289 /* mesh already went down */
1290 if (!sdata->u.mesh.mesh_id_len)
1291 goto out;
1292
1293 rx_status = IEEE80211_SKB_RXCB(skb);
1294 mgmt = (struct ieee80211_mgmt *) skb->data;
1295 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1296
1297 switch (stype) {
1298 case IEEE80211_STYPE_PROBE_RESP:
1299 case IEEE80211_STYPE_BEACON:
1300 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1301 rx_status);
1302 break;
1303 case IEEE80211_STYPE_PROBE_REQ:
1304 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1305 break;
1306 case IEEE80211_STYPE_ACTION:
1307 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1308 break;
1309 }
1310out:
1311 sdata_unlock(sdata);
1312}
1313
1314static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1315{
1316 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1317 u32 bit, changed = 0;
1318
1319 for_each_set_bit(bit, &ifmsh->mbss_changed,
1320 sizeof(changed) * BITS_PER_BYTE) {
1321 clear_bit(bit, &ifmsh->mbss_changed);
1322 changed |= BIT(bit);
1323 }
1324
1325 if (sdata->vif.bss_conf.enable_beacon &&
1326 (changed & (BSS_CHANGED_BEACON |
1327 BSS_CHANGED_HT |
1328 BSS_CHANGED_BASIC_RATES |
1329 BSS_CHANGED_BEACON_INT)))
1330 if (ieee80211_mesh_rebuild_beacon(sdata))
1331 return;
1332
1333 ieee80211_bss_info_change_notify(sdata, changed);
1334}
1335
1336void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1337{
1338 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1339
1340 sdata_lock(sdata);
1341
1342 /* mesh already went down */
1343 if (!sdata->u.mesh.mesh_id_len)
1344 goto out;
1345
1346 if (ifmsh->preq_queue_len &&
1347 time_after(jiffies,
1348 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1349 mesh_path_start_discovery(sdata);
1350
1351 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
1352 mesh_mpath_table_grow();
1353
1354 if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
1355 mesh_mpp_table_grow();
1356
1357 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1358 ieee80211_mesh_housekeeping(sdata);
1359
1360 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1361 ieee80211_mesh_rootpath(sdata);
1362
1363 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1364 mesh_sync_adjust_tbtt(sdata);
1365
1366 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1367 mesh_bss_info_changed(sdata);
1368out:
1369 sdata_unlock(sdata);
1370}
1371
1372
1373void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1374{
1375 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1376 static u8 zero_addr[ETH_ALEN] = {};
1377
1378 setup_timer(&ifmsh->housekeeping_timer,
1379 ieee80211_mesh_housekeeping_timer,
1380 (unsigned long) sdata);
1381
1382 ifmsh->accepting_plinks = true;
1383 atomic_set(&ifmsh->mpaths, 0);
1384 mesh_rmc_init(sdata);
1385 ifmsh->last_preq = jiffies;
1386 ifmsh->next_perr = jiffies;
1387 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1388 /* Allocate all mesh structures when creating the first mesh interface. */
1389 if (!mesh_allocated)
1390 ieee80211s_init();
1391 setup_timer(&ifmsh->mesh_path_timer,
1392 ieee80211_mesh_path_timer,
1393 (unsigned long) sdata);
1394 setup_timer(&ifmsh->mesh_path_root_timer,
1395 ieee80211_mesh_path_root_timer,
1396 (unsigned long) sdata);
1397 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1398 skb_queue_head_init(&ifmsh->ps.bc_buf);
1399 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1400 spin_lock_init(&ifmsh->sync_offset_lock);
1401 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1402
1403 sdata->vif.bss_conf.bssid = zero_addr;
1404}