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_pathtbl_init();
29 mesh_allocated = 1;
30 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
31 0, 0, NULL);
32 }
33
ieee80211s_stop(void)34 void ieee80211s_stop(void)
35 {
36 if (!mesh_allocated)
37 return;
38 mesh_pathtbl_unregister();
39 kmem_cache_destroy(rm_cache);
40 }
41
ieee80211_mesh_housekeeping_timer(unsigned long data)42 static 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 */
mesh_matches_local(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * ie)62 bool 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 ieee80211_ht_oper_to_chandef(sdata->vif.bss_conf.chandef.chan,
95 ie->ht_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 */
mesh_peer_accepts_plinks(struct ieee802_11_elems * ie)109 bool 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 */
mesh_accept_plinks_update(struct ieee80211_sub_if_data * sdata)122 u32 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 */
mesh_sta_cleanup(struct sta_info * sta)148 void mesh_sta_cleanup(struct sta_info *sta)
149 {
150 struct ieee80211_sub_if_data *sdata = sta->sdata;
151 u32 changed;
152
153 /*
154 * maybe userspace handles peer allocation and peering, but in either
155 * case the beacon is still generated by the kernel and we might need
156 * an update.
157 */
158 changed = mesh_accept_plinks_update(sdata);
159 if (!sdata->u.mesh.user_mpm) {
160 changed |= mesh_plink_deactivate(sta);
161 del_timer_sync(&sta->plink_timer);
162 }
163
164 /* make sure no readers can access nexthop sta from here on */
165 mesh_path_flush_by_nexthop(sta);
166 synchronize_net();
167
168 if (changed)
169 ieee80211_mbss_info_change_notify(sdata, changed);
170 }
171
mesh_rmc_init(struct ieee80211_sub_if_data * sdata)172 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
173 {
174 int i;
175
176 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
177 if (!sdata->u.mesh.rmc)
178 return -ENOMEM;
179 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
180 for (i = 0; i < RMC_BUCKETS; i++)
181 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
182 return 0;
183 }
184
mesh_rmc_free(struct ieee80211_sub_if_data * sdata)185 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
186 {
187 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
188 struct rmc_entry *p, *n;
189 int i;
190
191 if (!sdata->u.mesh.rmc)
192 return;
193
194 for (i = 0; i < RMC_BUCKETS; i++) {
195 list_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
196 list_del(&p->list);
197 kmem_cache_free(rm_cache, p);
198 }
199 }
200
201 kfree(rmc);
202 sdata->u.mesh.rmc = NULL;
203 }
204
205 /**
206 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
207 *
208 * @sdata: interface
209 * @sa: source address
210 * @mesh_hdr: mesh_header
211 *
212 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
213 *
214 * Checks using the source address and the mesh sequence number if we have
215 * received this frame lately. If the frame is not in the cache, it is added to
216 * it.
217 */
mesh_rmc_check(struct ieee80211_sub_if_data * sdata,const u8 * sa,struct ieee80211s_hdr * mesh_hdr)218 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
219 const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
220 {
221 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
222 u32 seqnum = 0;
223 int entries = 0;
224 u8 idx;
225 struct rmc_entry *p, *n;
226
227 /* Don't care about endianness since only match matters */
228 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
229 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
230 list_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
231 ++entries;
232 if (time_after(jiffies, p->exp_time) ||
233 entries == RMC_QUEUE_MAX_LEN) {
234 list_del(&p->list);
235 kmem_cache_free(rm_cache, p);
236 --entries;
237 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
238 return -1;
239 }
240
241 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
242 if (!p)
243 return 0;
244
245 p->seqnum = seqnum;
246 p->exp_time = jiffies + RMC_TIMEOUT;
247 memcpy(p->sa, sa, ETH_ALEN);
248 list_add(&p->list, &rmc->bucket[idx]);
249 return 0;
250 }
251
mesh_add_meshconf_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)252 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
253 struct sk_buff *skb)
254 {
255 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
256 u8 *pos, neighbors;
257 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
258
259 if (skb_tailroom(skb) < 2 + meshconf_len)
260 return -ENOMEM;
261
262 pos = skb_put(skb, 2 + meshconf_len);
263 *pos++ = WLAN_EID_MESH_CONFIG;
264 *pos++ = meshconf_len;
265
266 /* save a pointer for quick updates in pre-tbtt */
267 ifmsh->meshconf_offset = pos - skb->data;
268
269 /* Active path selection protocol ID */
270 *pos++ = ifmsh->mesh_pp_id;
271 /* Active path selection metric ID */
272 *pos++ = ifmsh->mesh_pm_id;
273 /* Congestion control mode identifier */
274 *pos++ = ifmsh->mesh_cc_id;
275 /* Synchronization protocol identifier */
276 *pos++ = ifmsh->mesh_sp_id;
277 /* Authentication Protocol identifier */
278 *pos++ = ifmsh->mesh_auth_id;
279 /* Mesh Formation Info - number of neighbors */
280 neighbors = atomic_read(&ifmsh->estab_plinks);
281 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
282 *pos++ = neighbors << 1;
283 /* Mesh capability */
284 *pos = 0x00;
285 *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
286 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
287 *pos |= ifmsh->accepting_plinks ?
288 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
289 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
290 *pos |= ifmsh->ps_peers_deep_sleep ?
291 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
292 *pos++ |= ifmsh->adjusting_tbtt ?
293 IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
294 *pos++ = 0x00;
295
296 return 0;
297 }
298
mesh_add_meshid_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)299 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
300 {
301 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
302 u8 *pos;
303
304 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
305 return -ENOMEM;
306
307 pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
308 *pos++ = WLAN_EID_MESH_ID;
309 *pos++ = ifmsh->mesh_id_len;
310 if (ifmsh->mesh_id_len)
311 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
312
313 return 0;
314 }
315
mesh_add_awake_window_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)316 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
317 struct sk_buff *skb)
318 {
319 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
320 u8 *pos;
321
322 /* see IEEE802.11-2012 13.14.6 */
323 if (ifmsh->ps_peers_light_sleep == 0 &&
324 ifmsh->ps_peers_deep_sleep == 0 &&
325 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
326 return 0;
327
328 if (skb_tailroom(skb) < 4)
329 return -ENOMEM;
330
331 pos = skb_put(skb, 2 + 2);
332 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
333 *pos++ = 2;
334 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
335
336 return 0;
337 }
338
mesh_add_vendor_ies(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)339 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
340 struct sk_buff *skb)
341 {
342 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
343 u8 offset, len;
344 const u8 *data;
345
346 if (!ifmsh->ie || !ifmsh->ie_len)
347 return 0;
348
349 /* fast-forward to vendor IEs */
350 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
351
352 if (offset) {
353 len = ifmsh->ie_len - offset;
354 data = ifmsh->ie + offset;
355 if (skb_tailroom(skb) < len)
356 return -ENOMEM;
357 memcpy(skb_put(skb, len), data, len);
358 }
359
360 return 0;
361 }
362
mesh_add_rsn_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)363 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
364 {
365 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
366 u8 len = 0;
367 const u8 *data;
368
369 if (!ifmsh->ie || !ifmsh->ie_len)
370 return 0;
371
372 /* find RSN IE */
373 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
374 if (!data)
375 return 0;
376
377 len = data[1] + 2;
378
379 if (skb_tailroom(skb) < len)
380 return -ENOMEM;
381 memcpy(skb_put(skb, len), data, len);
382
383 return 0;
384 }
385
mesh_add_ds_params_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)386 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
387 struct sk_buff *skb)
388 {
389 struct ieee80211_chanctx_conf *chanctx_conf;
390 struct ieee80211_channel *chan;
391 u8 *pos;
392
393 if (skb_tailroom(skb) < 3)
394 return -ENOMEM;
395
396 rcu_read_lock();
397 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
398 if (WARN_ON(!chanctx_conf)) {
399 rcu_read_unlock();
400 return -EINVAL;
401 }
402 chan = chanctx_conf->def.chan;
403 rcu_read_unlock();
404
405 pos = skb_put(skb, 2 + 1);
406 *pos++ = WLAN_EID_DS_PARAMS;
407 *pos++ = 1;
408 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
409
410 return 0;
411 }
412
mesh_add_ht_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)413 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
414 struct sk_buff *skb)
415 {
416 struct ieee80211_local *local = sdata->local;
417 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
418 struct ieee80211_supported_band *sband;
419 u8 *pos;
420
421 sband = local->hw.wiphy->bands[band];
422 if (!sband->ht_cap.ht_supported ||
423 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
424 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
425 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
426 return 0;
427
428 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
429 return -ENOMEM;
430
431 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
432 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
433
434 return 0;
435 }
436
mesh_add_ht_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)437 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
438 struct sk_buff *skb)
439 {
440 struct ieee80211_local *local = sdata->local;
441 struct ieee80211_chanctx_conf *chanctx_conf;
442 struct ieee80211_channel *channel;
443 enum nl80211_channel_type channel_type =
444 cfg80211_get_chandef_type(&sdata->vif.bss_conf.chandef);
445 struct ieee80211_supported_band *sband;
446 struct ieee80211_sta_ht_cap *ht_cap;
447 u8 *pos;
448
449 rcu_read_lock();
450 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
451 if (WARN_ON(!chanctx_conf)) {
452 rcu_read_unlock();
453 return -EINVAL;
454 }
455 channel = chanctx_conf->def.chan;
456 rcu_read_unlock();
457
458 sband = local->hw.wiphy->bands[channel->band];
459 ht_cap = &sband->ht_cap;
460
461 if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
462 return 0;
463
464 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
465 return -ENOMEM;
466
467 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
468 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
469 sdata->vif.bss_conf.ht_operation_mode);
470
471 return 0;
472 }
473
ieee80211_mesh_path_timer(unsigned long data)474 static void ieee80211_mesh_path_timer(unsigned long data)
475 {
476 struct ieee80211_sub_if_data *sdata =
477 (struct ieee80211_sub_if_data *) data;
478
479 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
480 }
481
ieee80211_mesh_path_root_timer(unsigned long data)482 static void ieee80211_mesh_path_root_timer(unsigned long data)
483 {
484 struct ieee80211_sub_if_data *sdata =
485 (struct ieee80211_sub_if_data *) data;
486 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
487
488 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
489
490 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
491 }
492
ieee80211_mesh_root_setup(struct ieee80211_if_mesh * ifmsh)493 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
494 {
495 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
496 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
497 else {
498 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
499 /* stop running timer */
500 del_timer_sync(&ifmsh->mesh_path_root_timer);
501 }
502 }
503
504 /**
505 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
506 * @hdr: 802.11 frame header
507 * @fc: frame control field
508 * @meshda: destination address in the mesh
509 * @meshsa: source address address in the mesh. Same as TA, as frame is
510 * locally originated.
511 *
512 * Return the length of the 802.11 (does not include a mesh control header)
513 */
ieee80211_fill_mesh_addresses(struct ieee80211_hdr * hdr,__le16 * fc,const u8 * meshda,const u8 * meshsa)514 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
515 const u8 *meshda, const u8 *meshsa)
516 {
517 if (is_multicast_ether_addr(meshda)) {
518 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
519 /* DA TA SA */
520 memcpy(hdr->addr1, meshda, ETH_ALEN);
521 memcpy(hdr->addr2, meshsa, ETH_ALEN);
522 memcpy(hdr->addr3, meshsa, ETH_ALEN);
523 return 24;
524 } else {
525 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
526 /* RA TA DA SA */
527 eth_zero_addr(hdr->addr1); /* RA is resolved later */
528 memcpy(hdr->addr2, meshsa, ETH_ALEN);
529 memcpy(hdr->addr3, meshda, ETH_ALEN);
530 memcpy(hdr->addr4, meshsa, ETH_ALEN);
531 return 30;
532 }
533 }
534
535 /**
536 * ieee80211_new_mesh_header - create a new mesh header
537 * @sdata: mesh interface to be used
538 * @meshhdr: uninitialized mesh header
539 * @addr4or5: 1st address in the ae header, which may correspond to address 4
540 * (if addr6 is NULL) or address 5 (if addr6 is present). It may
541 * be NULL.
542 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
543 * mesh frame
544 *
545 * Return the header length.
546 */
ieee80211_new_mesh_header(struct ieee80211_sub_if_data * sdata,struct ieee80211s_hdr * meshhdr,const char * addr4or5,const char * addr6)547 int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
548 struct ieee80211s_hdr *meshhdr,
549 const char *addr4or5, const char *addr6)
550 {
551 if (WARN_ON(!addr4or5 && addr6))
552 return 0;
553
554 memset(meshhdr, 0, sizeof(*meshhdr));
555
556 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
557
558 /* FIXME: racy -- TX on multiple queues can be concurrent */
559 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
560 sdata->u.mesh.mesh_seqnum++;
561
562 if (addr4or5 && !addr6) {
563 meshhdr->flags |= MESH_FLAGS_AE_A4;
564 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
565 return 2 * ETH_ALEN;
566 } else if (addr4or5 && addr6) {
567 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
568 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
569 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
570 return 3 * ETH_ALEN;
571 }
572
573 return ETH_ALEN;
574 }
575
ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data * sdata)576 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
577 {
578 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
579 u32 changed;
580
581 if (ifmsh->mshcfg.plink_timeout > 0)
582 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
583 mesh_path_expire(sdata);
584
585 changed = mesh_accept_plinks_update(sdata);
586 ieee80211_mbss_info_change_notify(sdata, changed);
587
588 mod_timer(&ifmsh->housekeeping_timer,
589 round_jiffies(jiffies +
590 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
591 }
592
ieee80211_mesh_rootpath(struct ieee80211_sub_if_data * sdata)593 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
594 {
595 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
596 u32 interval;
597
598 mesh_path_tx_root_frame(sdata);
599
600 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
601 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
602 else
603 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
604
605 mod_timer(&ifmsh->mesh_path_root_timer,
606 round_jiffies(TU_TO_EXP_TIME(interval)));
607 }
608
609 static int
ieee80211_mesh_build_beacon(struct ieee80211_if_mesh * ifmsh)610 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
611 {
612 struct beacon_data *bcn;
613 int head_len, tail_len;
614 struct sk_buff *skb;
615 struct ieee80211_mgmt *mgmt;
616 struct ieee80211_chanctx_conf *chanctx_conf;
617 struct mesh_csa_settings *csa;
618 enum ieee80211_band band;
619 u8 *pos;
620 struct ieee80211_sub_if_data *sdata;
621 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
622 sizeof(mgmt->u.beacon);
623
624 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
625 rcu_read_lock();
626 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
627 band = chanctx_conf->def.chan->band;
628 rcu_read_unlock();
629
630 head_len = hdr_len +
631 2 + /* NULL SSID */
632 /* Channel Switch Announcement */
633 2 + sizeof(struct ieee80211_channel_sw_ie) +
634 /* Mesh Channel Swith Parameters */
635 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
636 2 + 8 + /* supported rates */
637 2 + 3; /* DS params */
638 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
639 2 + sizeof(struct ieee80211_ht_cap) +
640 2 + sizeof(struct ieee80211_ht_operation) +
641 2 + ifmsh->mesh_id_len +
642 2 + sizeof(struct ieee80211_meshconf_ie) +
643 2 + sizeof(__le16) + /* awake window */
644 ifmsh->ie_len;
645
646 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
647 /* need an skb for IE builders to operate on */
648 skb = dev_alloc_skb(max(head_len, tail_len));
649
650 if (!bcn || !skb)
651 goto out_free;
652
653 /*
654 * pointers go into the block we allocated,
655 * memory is | beacon_data | head | tail |
656 */
657 bcn->head = ((u8 *) bcn) + sizeof(*bcn);
658
659 /* fill in the head */
660 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
661 memset(mgmt, 0, hdr_len);
662 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
663 IEEE80211_STYPE_BEACON);
664 eth_broadcast_addr(mgmt->da);
665 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
666 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
667 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
668 mgmt->u.beacon.beacon_int =
669 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
670 mgmt->u.beacon.capab_info |= cpu_to_le16(
671 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
672
673 pos = skb_put(skb, 2);
674 *pos++ = WLAN_EID_SSID;
675 *pos++ = 0x0;
676
677 rcu_read_lock();
678 csa = rcu_dereference(ifmsh->csa);
679 if (csa) {
680 pos = skb_put(skb, 13);
681 memset(pos, 0, 13);
682 *pos++ = WLAN_EID_CHANNEL_SWITCH;
683 *pos++ = 3;
684 *pos++ = 0x0;
685 *pos++ = ieee80211_frequency_to_channel(
686 csa->settings.chandef.chan->center_freq);
687 bcn->csa_current_counter = csa->settings.count;
688 bcn->csa_counter_offsets[0] = hdr_len + 6;
689 *pos++ = csa->settings.count;
690 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
691 *pos++ = 6;
692 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
693 *pos++ = ifmsh->mshcfg.dot11MeshTTL;
694 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
695 } else {
696 *pos++ = ifmsh->chsw_ttl;
697 }
698 *pos++ |= csa->settings.block_tx ?
699 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
700 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
701 pos += 2;
702 put_unaligned_le16(ifmsh->pre_value, pos);
703 pos += 2;
704 }
705 rcu_read_unlock();
706
707 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
708 mesh_add_ds_params_ie(sdata, skb))
709 goto out_free;
710
711 bcn->head_len = skb->len;
712 memcpy(bcn->head, skb->data, bcn->head_len);
713
714 /* now the tail */
715 skb_trim(skb, 0);
716 bcn->tail = bcn->head + bcn->head_len;
717
718 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
719 mesh_add_rsn_ie(sdata, skb) ||
720 mesh_add_ht_cap_ie(sdata, skb) ||
721 mesh_add_ht_oper_ie(sdata, skb) ||
722 mesh_add_meshid_ie(sdata, skb) ||
723 mesh_add_meshconf_ie(sdata, skb) ||
724 mesh_add_awake_window_ie(sdata, skb) ||
725 mesh_add_vendor_ies(sdata, skb))
726 goto out_free;
727
728 bcn->tail_len = skb->len;
729 memcpy(bcn->tail, skb->data, bcn->tail_len);
730 bcn->meshconf = (struct ieee80211_meshconf_ie *)
731 (bcn->tail + ifmsh->meshconf_offset);
732
733 dev_kfree_skb(skb);
734 rcu_assign_pointer(ifmsh->beacon, bcn);
735 return 0;
736 out_free:
737 kfree(bcn);
738 dev_kfree_skb(skb);
739 return -ENOMEM;
740 }
741
742 static int
ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data * sdata)743 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
744 {
745 struct beacon_data *old_bcn;
746 int ret;
747
748 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
749 lockdep_is_held(&sdata->wdev.mtx));
750 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
751 if (ret)
752 /* just reuse old beacon */
753 return ret;
754
755 if (old_bcn)
756 kfree_rcu(old_bcn, rcu_head);
757 return 0;
758 }
759
ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data * sdata,u32 changed)760 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
761 u32 changed)
762 {
763 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
764 unsigned long bits = changed;
765 u32 bit;
766
767 if (!bits)
768 return;
769
770 /* if we race with running work, worst case this work becomes a noop */
771 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
772 set_bit(bit, &ifmsh->mbss_changed);
773 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
774 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
775 }
776
ieee80211_start_mesh(struct ieee80211_sub_if_data * sdata)777 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
778 {
779 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
780 struct ieee80211_local *local = sdata->local;
781 u32 changed = BSS_CHANGED_BEACON |
782 BSS_CHANGED_BEACON_ENABLED |
783 BSS_CHANGED_HT |
784 BSS_CHANGED_BASIC_RATES |
785 BSS_CHANGED_BEACON_INT;
786
787 local->fif_other_bss++;
788 /* mesh ifaces must set allmulti to forward mcast traffic */
789 atomic_inc(&local->iff_allmultis);
790 ieee80211_configure_filter(local);
791
792 ifmsh->mesh_cc_id = 0; /* Disabled */
793 /* register sync ops from extensible synchronization framework */
794 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
795 ifmsh->adjusting_tbtt = false;
796 ifmsh->sync_offset_clockdrift_max = 0;
797 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
798 ieee80211_mesh_root_setup(ifmsh);
799 ieee80211_queue_work(&local->hw, &sdata->work);
800 sdata->vif.bss_conf.ht_operation_mode =
801 ifmsh->mshcfg.ht_opmode;
802 sdata->vif.bss_conf.enable_beacon = true;
803
804 changed |= ieee80211_mps_local_status_update(sdata);
805
806 if (ieee80211_mesh_build_beacon(ifmsh)) {
807 ieee80211_stop_mesh(sdata);
808 return -ENOMEM;
809 }
810
811 ieee80211_recalc_dtim(local, sdata);
812 ieee80211_bss_info_change_notify(sdata, changed);
813
814 netif_carrier_on(sdata->dev);
815 return 0;
816 }
817
ieee80211_stop_mesh(struct ieee80211_sub_if_data * sdata)818 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
819 {
820 struct ieee80211_local *local = sdata->local;
821 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
822 struct beacon_data *bcn;
823
824 netif_carrier_off(sdata->dev);
825
826 /* stop the beacon */
827 ifmsh->mesh_id_len = 0;
828 sdata->vif.bss_conf.enable_beacon = false;
829 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
830 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
831 bcn = rcu_dereference_protected(ifmsh->beacon,
832 lockdep_is_held(&sdata->wdev.mtx));
833 RCU_INIT_POINTER(ifmsh->beacon, NULL);
834 kfree_rcu(bcn, rcu_head);
835
836 /* flush STAs and mpaths on this iface */
837 sta_info_flush(sdata);
838 mesh_path_flush_by_iface(sdata);
839
840 /* free all potentially still buffered group-addressed frames */
841 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
842 skb_queue_purge(&ifmsh->ps.bc_buf);
843
844 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
845 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
846 del_timer_sync(&sdata->u.mesh.mesh_path_timer);
847
848 /* clear any mesh work (for next join) we may have accrued */
849 ifmsh->wrkq_flags = 0;
850 ifmsh->mbss_changed = 0;
851
852 local->fif_other_bss--;
853 atomic_dec(&local->iff_allmultis);
854 ieee80211_configure_filter(local);
855 }
856
857 static bool
ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,bool beacon)858 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
859 struct ieee802_11_elems *elems, bool beacon)
860 {
861 struct cfg80211_csa_settings params;
862 struct ieee80211_csa_ie csa_ie;
863 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
864 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
865 int err;
866 u32 sta_flags;
867
868 sdata_assert_lock(sdata);
869
870 sta_flags = IEEE80211_STA_DISABLE_VHT;
871 switch (sdata->vif.bss_conf.chandef.width) {
872 case NL80211_CHAN_WIDTH_20_NOHT:
873 sta_flags |= IEEE80211_STA_DISABLE_HT;
874 case NL80211_CHAN_WIDTH_20:
875 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
876 break;
877 default:
878 break;
879 }
880
881 memset(¶ms, 0, sizeof(params));
882 memset(&csa_ie, 0, sizeof(csa_ie));
883 err = ieee80211_parse_ch_switch_ie(sdata, elems, band,
884 sta_flags, sdata->vif.addr,
885 &csa_ie);
886 if (err < 0)
887 return false;
888 if (err)
889 return false;
890
891 params.chandef = csa_ie.chandef;
892 params.count = csa_ie.count;
893
894 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef,
895 IEEE80211_CHAN_DISABLED)) {
896 sdata_info(sdata,
897 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
898 sdata->vif.addr,
899 params.chandef.chan->center_freq,
900 params.chandef.width,
901 params.chandef.center_freq1,
902 params.chandef.center_freq2);
903 return false;
904 }
905
906 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
907 ¶ms.chandef,
908 NL80211_IFTYPE_MESH_POINT);
909 if (err < 0)
910 return false;
911 if (err > 0)
912 /* TODO: DFS not (yet) supported */
913 return false;
914
915 params.radar_required = err;
916
917 if (cfg80211_chandef_identical(¶ms.chandef,
918 &sdata->vif.bss_conf.chandef)) {
919 mcsa_dbg(sdata,
920 "received csa with an identical chandef, ignoring\n");
921 return true;
922 }
923
924 mcsa_dbg(sdata,
925 "received channel switch announcement to go to channel %d MHz\n",
926 params.chandef.chan->center_freq);
927
928 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
929 if (beacon) {
930 ifmsh->chsw_ttl = csa_ie.ttl - 1;
931 if (ifmsh->pre_value >= csa_ie.pre_value)
932 return false;
933 ifmsh->pre_value = csa_ie.pre_value;
934 }
935
936 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
937 return false;
938
939 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
940
941 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
942 ¶ms) < 0)
943 return false;
944
945 return true;
946 }
947
948 static void
ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)949 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
950 struct ieee80211_mgmt *mgmt, size_t len)
951 {
952 struct ieee80211_local *local = sdata->local;
953 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
954 struct sk_buff *presp;
955 struct beacon_data *bcn;
956 struct ieee80211_mgmt *hdr;
957 struct ieee802_11_elems elems;
958 size_t baselen;
959 u8 *pos;
960
961 pos = mgmt->u.probe_req.variable;
962 baselen = (u8 *) pos - (u8 *) mgmt;
963 if (baselen > len)
964 return;
965
966 ieee802_11_parse_elems(pos, len - baselen, false, &elems);
967
968 if (!elems.mesh_id)
969 return;
970
971 /* 802.11-2012 10.1.4.3.2 */
972 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
973 !is_broadcast_ether_addr(mgmt->da)) ||
974 elems.ssid_len != 0)
975 return;
976
977 if (elems.mesh_id_len != 0 &&
978 (elems.mesh_id_len != ifmsh->mesh_id_len ||
979 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
980 return;
981
982 rcu_read_lock();
983 bcn = rcu_dereference(ifmsh->beacon);
984
985 if (!bcn)
986 goto out;
987
988 presp = dev_alloc_skb(local->tx_headroom +
989 bcn->head_len + bcn->tail_len);
990 if (!presp)
991 goto out;
992
993 skb_reserve(presp, local->tx_headroom);
994 memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
995 memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
996 hdr = (struct ieee80211_mgmt *) presp->data;
997 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
998 IEEE80211_STYPE_PROBE_RESP);
999 memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1000 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1001 ieee80211_tx_skb(sdata, presp);
1002 out:
1003 rcu_read_unlock();
1004 }
1005
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)1006 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1007 u16 stype,
1008 struct ieee80211_mgmt *mgmt,
1009 size_t len,
1010 struct ieee80211_rx_status *rx_status)
1011 {
1012 struct ieee80211_local *local = sdata->local;
1013 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1014 struct ieee802_11_elems elems;
1015 struct ieee80211_channel *channel;
1016 size_t baselen;
1017 int freq;
1018 enum ieee80211_band band = rx_status->band;
1019
1020 /* ignore ProbeResp to foreign address */
1021 if (stype == IEEE80211_STYPE_PROBE_RESP &&
1022 !ether_addr_equal(mgmt->da, sdata->vif.addr))
1023 return;
1024
1025 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1026 if (baselen > len)
1027 return;
1028
1029 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1030 false, &elems);
1031
1032 /* ignore non-mesh or secure / unsecure mismatch */
1033 if ((!elems.mesh_id || !elems.mesh_config) ||
1034 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1035 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1036 return;
1037
1038 if (elems.ds_params)
1039 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1040 else
1041 freq = rx_status->freq;
1042
1043 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1044
1045 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1046 return;
1047
1048 if (mesh_matches_local(sdata, &elems))
1049 mesh_neighbour_update(sdata, mgmt->sa, &elems);
1050
1051 if (ifmsh->sync_ops)
1052 ifmsh->sync_ops->rx_bcn_presp(sdata,
1053 stype, mgmt, &elems, rx_status);
1054
1055 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1056 !sdata->vif.csa_active)
1057 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1058 }
1059
ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data * sdata)1060 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1061 {
1062 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1063 struct mesh_csa_settings *tmp_csa_settings;
1064 int ret = 0;
1065 int changed = 0;
1066
1067 /* Reset the TTL value and Initiator flag */
1068 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1069 ifmsh->chsw_ttl = 0;
1070
1071 /* Remove the CSA and MCSP elements from the beacon */
1072 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1073 RCU_INIT_POINTER(ifmsh->csa, NULL);
1074 if (tmp_csa_settings)
1075 kfree_rcu(tmp_csa_settings, rcu_head);
1076 ret = ieee80211_mesh_rebuild_beacon(sdata);
1077 if (ret)
1078 return -EINVAL;
1079
1080 changed |= BSS_CHANGED_BEACON;
1081
1082 mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1083 sdata->vif.bss_conf.chandef.chan->center_freq);
1084 return changed;
1085 }
1086
ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data * sdata,struct cfg80211_csa_settings * csa_settings)1087 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1088 struct cfg80211_csa_settings *csa_settings)
1089 {
1090 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1091 struct mesh_csa_settings *tmp_csa_settings;
1092 int ret = 0;
1093
1094 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1095 GFP_ATOMIC);
1096 if (!tmp_csa_settings)
1097 return -ENOMEM;
1098
1099 memcpy(&tmp_csa_settings->settings, csa_settings,
1100 sizeof(struct cfg80211_csa_settings));
1101
1102 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1103
1104 ret = ieee80211_mesh_rebuild_beacon(sdata);
1105 if (ret) {
1106 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1107 RCU_INIT_POINTER(ifmsh->csa, NULL);
1108 kfree_rcu(tmp_csa_settings, rcu_head);
1109 return ret;
1110 }
1111
1112 return BSS_CHANGED_BEACON;
1113 }
1114
mesh_fwd_csa_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1115 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1116 struct ieee80211_mgmt *mgmt, size_t len)
1117 {
1118 struct ieee80211_mgmt *mgmt_fwd;
1119 struct sk_buff *skb;
1120 struct ieee80211_local *local = sdata->local;
1121 u8 *pos = mgmt->u.action.u.chan_switch.variable;
1122 size_t offset_ttl;
1123
1124 skb = dev_alloc_skb(local->tx_headroom + len);
1125 if (!skb)
1126 return -ENOMEM;
1127 skb_reserve(skb, local->tx_headroom);
1128 mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len);
1129
1130 /* offset_ttl is based on whether the secondary channel
1131 * offset is available or not. Subtract 1 from the mesh TTL
1132 * and disable the initiator flag before forwarding.
1133 */
1134 offset_ttl = (len < 42) ? 7 : 10;
1135 *(pos + offset_ttl) -= 1;
1136 *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1137
1138 memcpy(mgmt_fwd, mgmt, len);
1139 eth_broadcast_addr(mgmt_fwd->da);
1140 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1141 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1142
1143 ieee80211_tx_skb(sdata, skb);
1144 return 0;
1145 }
1146
mesh_rx_csa_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1147 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1148 struct ieee80211_mgmt *mgmt, size_t len)
1149 {
1150 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1151 struct ieee802_11_elems elems;
1152 u16 pre_value;
1153 bool fwd_csa = true;
1154 size_t baselen;
1155 u8 *pos;
1156
1157 if (mgmt->u.action.u.measurement.action_code !=
1158 WLAN_ACTION_SPCT_CHL_SWITCH)
1159 return;
1160
1161 pos = mgmt->u.action.u.chan_switch.variable;
1162 baselen = offsetof(struct ieee80211_mgmt,
1163 u.action.u.chan_switch.variable);
1164 ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1165
1166 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1167 if (!--ifmsh->chsw_ttl)
1168 fwd_csa = false;
1169
1170 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1171 if (ifmsh->pre_value >= pre_value)
1172 return;
1173
1174 ifmsh->pre_value = pre_value;
1175
1176 if (!sdata->vif.csa_active &&
1177 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1178 mcsa_dbg(sdata, "Failed to process CSA action frame");
1179 return;
1180 }
1181
1182 /* forward or re-broadcast the CSA frame */
1183 if (fwd_csa) {
1184 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0)
1185 mcsa_dbg(sdata, "Failed to forward the CSA frame");
1186 }
1187 }
1188
ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1189 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1190 struct ieee80211_mgmt *mgmt,
1191 size_t len,
1192 struct ieee80211_rx_status *rx_status)
1193 {
1194 switch (mgmt->u.action.category) {
1195 case WLAN_CATEGORY_SELF_PROTECTED:
1196 switch (mgmt->u.action.u.self_prot.action_code) {
1197 case WLAN_SP_MESH_PEERING_OPEN:
1198 case WLAN_SP_MESH_PEERING_CLOSE:
1199 case WLAN_SP_MESH_PEERING_CONFIRM:
1200 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1201 break;
1202 }
1203 break;
1204 case WLAN_CATEGORY_MESH_ACTION:
1205 if (mesh_action_is_path_sel(mgmt))
1206 mesh_rx_path_sel_frame(sdata, mgmt, len);
1207 break;
1208 case WLAN_CATEGORY_SPECTRUM_MGMT:
1209 mesh_rx_csa_frame(sdata, mgmt, len);
1210 break;
1211 }
1212 }
1213
ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1214 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1215 struct sk_buff *skb)
1216 {
1217 struct ieee80211_rx_status *rx_status;
1218 struct ieee80211_mgmt *mgmt;
1219 u16 stype;
1220
1221 sdata_lock(sdata);
1222
1223 /* mesh already went down */
1224 if (!sdata->u.mesh.mesh_id_len)
1225 goto out;
1226
1227 rx_status = IEEE80211_SKB_RXCB(skb);
1228 mgmt = (struct ieee80211_mgmt *) skb->data;
1229 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1230
1231 switch (stype) {
1232 case IEEE80211_STYPE_PROBE_RESP:
1233 case IEEE80211_STYPE_BEACON:
1234 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1235 rx_status);
1236 break;
1237 case IEEE80211_STYPE_PROBE_REQ:
1238 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1239 break;
1240 case IEEE80211_STYPE_ACTION:
1241 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1242 break;
1243 }
1244 out:
1245 sdata_unlock(sdata);
1246 }
1247
mesh_bss_info_changed(struct ieee80211_sub_if_data * sdata)1248 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1249 {
1250 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1251 u32 bit, changed = 0;
1252
1253 for_each_set_bit(bit, &ifmsh->mbss_changed,
1254 sizeof(changed) * BITS_PER_BYTE) {
1255 clear_bit(bit, &ifmsh->mbss_changed);
1256 changed |= BIT(bit);
1257 }
1258
1259 if (sdata->vif.bss_conf.enable_beacon &&
1260 (changed & (BSS_CHANGED_BEACON |
1261 BSS_CHANGED_HT |
1262 BSS_CHANGED_BASIC_RATES |
1263 BSS_CHANGED_BEACON_INT)))
1264 if (ieee80211_mesh_rebuild_beacon(sdata))
1265 return;
1266
1267 ieee80211_bss_info_change_notify(sdata, changed);
1268 }
1269
ieee80211_mesh_work(struct ieee80211_sub_if_data * sdata)1270 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1271 {
1272 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1273
1274 sdata_lock(sdata);
1275
1276 /* mesh already went down */
1277 if (!sdata->u.mesh.mesh_id_len)
1278 goto out;
1279
1280 if (ifmsh->preq_queue_len &&
1281 time_after(jiffies,
1282 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1283 mesh_path_start_discovery(sdata);
1284
1285 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
1286 mesh_mpath_table_grow();
1287
1288 if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
1289 mesh_mpp_table_grow();
1290
1291 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1292 ieee80211_mesh_housekeeping(sdata);
1293
1294 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1295 ieee80211_mesh_rootpath(sdata);
1296
1297 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1298 mesh_sync_adjust_tbtt(sdata);
1299
1300 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1301 mesh_bss_info_changed(sdata);
1302 out:
1303 sdata_unlock(sdata);
1304 }
1305
1306
ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data * sdata)1307 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1308 {
1309 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1310 static u8 zero_addr[ETH_ALEN] = {};
1311
1312 setup_timer(&ifmsh->housekeeping_timer,
1313 ieee80211_mesh_housekeeping_timer,
1314 (unsigned long) sdata);
1315
1316 ifmsh->accepting_plinks = true;
1317 atomic_set(&ifmsh->mpaths, 0);
1318 mesh_rmc_init(sdata);
1319 ifmsh->last_preq = jiffies;
1320 ifmsh->next_perr = jiffies;
1321 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1322 /* Allocate all mesh structures when creating the first mesh interface. */
1323 if (!mesh_allocated)
1324 ieee80211s_init();
1325 setup_timer(&ifmsh->mesh_path_timer,
1326 ieee80211_mesh_path_timer,
1327 (unsigned long) sdata);
1328 setup_timer(&ifmsh->mesh_path_root_timer,
1329 ieee80211_mesh_path_root_timer,
1330 (unsigned long) sdata);
1331 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1332 skb_queue_head_init(&ifmsh->ps.bc_buf);
1333 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1334 spin_lock_init(&ifmsh->sync_offset_lock);
1335 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1336
1337 sdata->vif.bss_conf.bssid = zero_addr;
1338 }
1339