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cfg80211/nl80211: add API for MAC address ACLs
[deliverable/linux.git] / net / mac80211 / mesh_plink.c
1 /*
2 * Copyright (c) 2008, 2009 open80211s Ltd.
3 * Author: Luis Carlos Cobo <luisca@cozybit.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9 #include <linux/gfp.h>
10 #include <linux/kernel.h>
11 #include <linux/random.h>
12 #include "ieee80211_i.h"
13 #include "rate.h"
14 #include "mesh.h"
15
16 #define PLINK_GET_LLID(p) (p + 2)
17 #define PLINK_GET_PLID(p) (p + 4)
18
19 #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \
20 jiffies + HZ * t / 1000))
21
22 /* We only need a valid sta if user configured a minimum rssi_threshold. */
23 #define rssi_threshold_check(sta, sdata) \
24 (sdata->u.mesh.mshcfg.rssi_threshold == 0 ||\
25 (sta && (s8) -ewma_read(&sta->avg_signal) > \
26 sdata->u.mesh.mshcfg.rssi_threshold))
27
28 enum plink_event {
29 PLINK_UNDEFINED,
30 OPN_ACPT,
31 OPN_RJCT,
32 OPN_IGNR,
33 CNF_ACPT,
34 CNF_RJCT,
35 CNF_IGNR,
36 CLS_ACPT,
37 CLS_IGNR
38 };
39
40 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
41 enum ieee80211_self_protected_actioncode action,
42 u8 *da, __le16 llid, __le16 plid, __le16 reason);
43
44 /**
45 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
46 *
47 * @sta: mesh peer link to restart
48 *
49 * Locking: this function must be called holding sta->lock
50 */
51 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
52 {
53 sta->plink_state = NL80211_PLINK_LISTEN;
54 sta->llid = sta->plid = sta->reason = 0;
55 sta->plink_retries = 0;
56 }
57
58 /**
59 * mesh_set_ht_prot_mode - set correct HT protection mode
60 *
61 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
62 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
63 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
64 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
65 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
66 * HT20 peer is present. Otherwise no-protection mode is selected.
67 */
68 static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
69 {
70 struct ieee80211_local *local = sdata->local;
71 struct sta_info *sta;
72 u32 changed = 0;
73 u16 ht_opmode;
74 bool non_ht_sta = false, ht20_sta = false;
75
76 if (sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT)
77 return 0;
78
79 rcu_read_lock();
80 list_for_each_entry_rcu(sta, &local->sta_list, list) {
81 if (sdata != sta->sdata ||
82 sta->plink_state != NL80211_PLINK_ESTAB)
83 continue;
84
85 switch (sta->ch_width) {
86 case NL80211_CHAN_WIDTH_20_NOHT:
87 mpl_dbg(sdata,
88 "mesh_plink %pM: nonHT sta (%pM) is present\n",
89 sdata->vif.addr, sta->sta.addr);
90 non_ht_sta = true;
91 goto out;
92 case NL80211_CHAN_WIDTH_20:
93 mpl_dbg(sdata,
94 "mesh_plink %pM: HT20 sta (%pM) is present\n",
95 sdata->vif.addr, sta->sta.addr);
96 ht20_sta = true;
97 default:
98 break;
99 }
100 }
101 out:
102 rcu_read_unlock();
103
104 if (non_ht_sta)
105 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
106 else if (ht20_sta &&
107 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
108 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
109 else
110 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
111
112 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
113 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
114 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
115 changed = BSS_CHANGED_HT;
116 mpl_dbg(sdata,
117 "mesh_plink %pM: protection mode changed to %d\n",
118 sdata->vif.addr, ht_opmode);
119 }
120
121 return changed;
122 }
123
124 /**
125 * __mesh_plink_deactivate - deactivate mesh peer link
126 *
127 * @sta: mesh peer link to deactivate
128 *
129 * All mesh paths with this peer as next hop will be flushed
130 * Returns beacon changed flag if the beacon content changed.
131 *
132 * Locking: the caller must hold sta->lock
133 */
134 static u32 __mesh_plink_deactivate(struct sta_info *sta)
135 {
136 struct ieee80211_sub_if_data *sdata = sta->sdata;
137 u32 changed = 0;
138
139 if (sta->plink_state == NL80211_PLINK_ESTAB)
140 changed = mesh_plink_dec_estab_count(sdata);
141 sta->plink_state = NL80211_PLINK_BLOCKED;
142 mesh_path_flush_by_nexthop(sta);
143
144 return changed;
145 }
146
147 /**
148 * mesh_plink_deactivate - deactivate mesh peer link
149 *
150 * @sta: mesh peer link to deactivate
151 *
152 * All mesh paths with this peer as next hop will be flushed
153 */
154 void mesh_plink_deactivate(struct sta_info *sta)
155 {
156 struct ieee80211_sub_if_data *sdata = sta->sdata;
157 u32 changed;
158
159 spin_lock_bh(&sta->lock);
160 changed = __mesh_plink_deactivate(sta);
161 sta->reason = cpu_to_le16(WLAN_REASON_MESH_PEER_CANCELED);
162 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
163 sta->sta.addr, sta->llid, sta->plid,
164 sta->reason);
165 spin_unlock_bh(&sta->lock);
166
167 ieee80211_bss_info_change_notify(sdata, changed);
168 }
169
170 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
171 enum ieee80211_self_protected_actioncode action,
172 u8 *da, __le16 llid, __le16 plid, __le16 reason) {
173 struct ieee80211_local *local = sdata->local;
174 struct sk_buff *skb;
175 struct ieee80211_tx_info *info;
176 struct ieee80211_mgmt *mgmt;
177 bool include_plid = false;
178 u16 peering_proto = 0;
179 u8 *pos, ie_len = 4;
180 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
181 sizeof(mgmt->u.action.u.self_prot);
182 int err = -ENOMEM;
183
184 skb = dev_alloc_skb(local->tx_headroom +
185 hdr_len +
186 2 + /* capability info */
187 2 + /* AID */
188 2 + 8 + /* supported rates */
189 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
190 2 + sdata->u.mesh.mesh_id_len +
191 2 + sizeof(struct ieee80211_meshconf_ie) +
192 2 + sizeof(struct ieee80211_ht_cap) +
193 2 + sizeof(struct ieee80211_ht_operation) +
194 2 + 8 + /* peering IE */
195 sdata->u.mesh.ie_len);
196 if (!skb)
197 return -1;
198 info = IEEE80211_SKB_CB(skb);
199 skb_reserve(skb, local->tx_headroom);
200 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
201 memset(mgmt, 0, hdr_len);
202 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
203 IEEE80211_STYPE_ACTION);
204 memcpy(mgmt->da, da, ETH_ALEN);
205 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
206 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
207 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
208 mgmt->u.action.u.self_prot.action_code = action;
209
210 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
211 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
212
213 /* capability info */
214 pos = skb_put(skb, 2);
215 memset(pos, 0, 2);
216 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
217 /* AID */
218 pos = skb_put(skb, 2);
219 memcpy(pos + 2, &plid, 2);
220 }
221 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
222 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
223 mesh_add_rsn_ie(skb, sdata) ||
224 mesh_add_meshid_ie(skb, sdata) ||
225 mesh_add_meshconf_ie(skb, sdata))
226 goto free;
227 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
228 info->flags |= IEEE80211_TX_CTL_NO_ACK;
229 if (mesh_add_meshid_ie(skb, sdata))
230 goto free;
231 }
232
233 /* Add Mesh Peering Management element */
234 switch (action) {
235 case WLAN_SP_MESH_PEERING_OPEN:
236 break;
237 case WLAN_SP_MESH_PEERING_CONFIRM:
238 ie_len += 2;
239 include_plid = true;
240 break;
241 case WLAN_SP_MESH_PEERING_CLOSE:
242 if (plid) {
243 ie_len += 2;
244 include_plid = true;
245 }
246 ie_len += 2; /* reason code */
247 break;
248 default:
249 err = -EINVAL;
250 goto free;
251 }
252
253 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
254 goto free;
255
256 pos = skb_put(skb, 2 + ie_len);
257 *pos++ = WLAN_EID_PEER_MGMT;
258 *pos++ = ie_len;
259 memcpy(pos, &peering_proto, 2);
260 pos += 2;
261 memcpy(pos, &llid, 2);
262 pos += 2;
263 if (include_plid) {
264 memcpy(pos, &plid, 2);
265 pos += 2;
266 }
267 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
268 memcpy(pos, &reason, 2);
269 pos += 2;
270 }
271
272 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
273 if (mesh_add_ht_cap_ie(skb, sdata) ||
274 mesh_add_ht_oper_ie(skb, sdata))
275 goto free;
276 }
277
278 if (mesh_add_vendor_ies(skb, sdata))
279 goto free;
280
281 ieee80211_tx_skb(sdata, skb);
282 return 0;
283 free:
284 kfree_skb(skb);
285 return err;
286 }
287
288 static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
289 struct sta_info *sta,
290 struct ieee802_11_elems *elems, bool insert)
291 {
292 struct ieee80211_local *local = sdata->local;
293 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
294 struct ieee80211_supported_band *sband;
295 u32 rates, basic_rates = 0, changed = 0;
296
297 sband = local->hw.wiphy->bands[band];
298 rates = ieee80211_sta_get_rates(local, elems, band, &basic_rates);
299
300 spin_lock_bh(&sta->lock);
301 sta->last_rx = jiffies;
302
303 /* rates and capabilities don't change during peering */
304 if (sta->plink_state == NL80211_PLINK_ESTAB)
305 goto out;
306
307 if (sta->sta.supp_rates[band] != rates)
308 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
309 sta->sta.supp_rates[band] = rates;
310 if (elems->ht_cap_elem &&
311 sdata->vif.bss_conf.chandef.width != NL80211_CHAN_WIDTH_20_NOHT)
312 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
313 elems->ht_cap_elem,
314 &sta->sta.ht_cap);
315 else
316 memset(&sta->sta.ht_cap, 0, sizeof(sta->sta.ht_cap));
317
318 if (elems->ht_operation) {
319 struct cfg80211_chan_def chandef;
320
321 if (!(elems->ht_operation->ht_param &
322 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
323 sta->sta.ht_cap.cap &=
324 ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
325 ieee80211_ht_oper_to_chandef(sdata->vif.bss_conf.chandef.chan,
326 elems->ht_operation, &chandef);
327 if (sta->ch_width != chandef.width)
328 changed |= IEEE80211_RC_BW_CHANGED;
329 sta->ch_width = chandef.width;
330 }
331
332 if (insert)
333 rate_control_rate_init(sta);
334 else
335 rate_control_rate_update(local, sband, sta, changed);
336 out:
337 spin_unlock_bh(&sta->lock);
338 }
339
340 static struct sta_info *
341 __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
342 {
343 struct sta_info *sta;
344
345 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
346 return NULL;
347
348 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
349 if (!sta)
350 return NULL;
351
352 sta->plink_state = NL80211_PLINK_LISTEN;
353 init_timer(&sta->plink_timer);
354
355 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
356 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
357 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
358
359 set_sta_flag(sta, WLAN_STA_WME);
360
361 return sta;
362 }
363
364 static struct sta_info *
365 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
366 struct ieee802_11_elems *elems)
367 {
368 struct sta_info *sta = NULL;
369
370 /* Userspace handles peer allocation when security is enabled */
371 if (sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
372 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
373 elems->ie_start,
374 elems->total_len,
375 GFP_KERNEL);
376 else
377 sta = __mesh_sta_info_alloc(sdata, addr);
378
379 return sta;
380 }
381
382 /*
383 * mesh_sta_info_get - return mesh sta info entry for @addr.
384 *
385 * @sdata: local meshif
386 * @addr: peer's address
387 * @elems: IEs from beacon or mesh peering frame.
388 *
389 * Return existing or newly allocated sta_info under RCU read lock.
390 * (re)initialize with given IEs.
391 */
392 static struct sta_info *
393 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
394 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
395 {
396 struct sta_info *sta = NULL;
397
398 rcu_read_lock();
399 sta = sta_info_get(sdata, addr);
400 if (sta) {
401 mesh_sta_info_init(sdata, sta, elems, false);
402 } else {
403 rcu_read_unlock();
404 /* can't run atomic */
405 sta = mesh_sta_info_alloc(sdata, addr, elems);
406 if (!sta) {
407 rcu_read_lock();
408 return NULL;
409 }
410
411 if (sta_info_insert_rcu(sta))
412 return NULL;
413 }
414
415 return sta;
416 }
417
418 /*
419 * mesh_neighbour_update - update or initialize new mesh neighbor.
420 *
421 * @sdata: local meshif
422 * @addr: peer's address
423 * @elems: IEs from beacon or mesh peering frame
424 *
425 * Initiates peering if appropriate.
426 */
427 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
428 u8 *hw_addr,
429 struct ieee802_11_elems *elems)
430 {
431 struct sta_info *sta;
432
433 sta = mesh_sta_info_get(sdata, hw_addr, elems);
434 if (!sta)
435 goto out;
436
437 if (mesh_peer_accepts_plinks(elems) &&
438 sta->plink_state == NL80211_PLINK_LISTEN &&
439 sdata->u.mesh.accepting_plinks &&
440 sdata->u.mesh.mshcfg.auto_open_plinks &&
441 rssi_threshold_check(sta, sdata))
442 mesh_plink_open(sta);
443
444 out:
445 rcu_read_unlock();
446 }
447
448 static void mesh_plink_timer(unsigned long data)
449 {
450 struct sta_info *sta;
451 __le16 llid, plid, reason;
452 struct ieee80211_sub_if_data *sdata;
453 struct mesh_config *mshcfg;
454
455 /*
456 * This STA is valid because sta_info_destroy() will
457 * del_timer_sync() this timer after having made sure
458 * it cannot be readded (by deleting the plink.)
459 */
460 sta = (struct sta_info *) data;
461
462 if (sta->sdata->local->quiescing) {
463 sta->plink_timer_was_running = true;
464 return;
465 }
466
467 spin_lock_bh(&sta->lock);
468 if (sta->ignore_plink_timer) {
469 sta->ignore_plink_timer = false;
470 spin_unlock_bh(&sta->lock);
471 return;
472 }
473 mpl_dbg(sta->sdata,
474 "Mesh plink timer for %pM fired on state %d\n",
475 sta->sta.addr, sta->plink_state);
476 reason = 0;
477 llid = sta->llid;
478 plid = sta->plid;
479 sdata = sta->sdata;
480 mshcfg = &sdata->u.mesh.mshcfg;
481
482 switch (sta->plink_state) {
483 case NL80211_PLINK_OPN_RCVD:
484 case NL80211_PLINK_OPN_SNT:
485 /* retry timer */
486 if (sta->plink_retries < mshcfg->dot11MeshMaxRetries) {
487 u32 rand;
488 mpl_dbg(sta->sdata,
489 "Mesh plink for %pM (retry, timeout): %d %d\n",
490 sta->sta.addr, sta->plink_retries,
491 sta->plink_timeout);
492 get_random_bytes(&rand, sizeof(u32));
493 sta->plink_timeout = sta->plink_timeout +
494 rand % sta->plink_timeout;
495 ++sta->plink_retries;
496 mod_plink_timer(sta, sta->plink_timeout);
497 spin_unlock_bh(&sta->lock);
498 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
499 sta->sta.addr, llid, 0, 0);
500 break;
501 }
502 reason = cpu_to_le16(WLAN_REASON_MESH_MAX_RETRIES);
503 /* fall through on else */
504 case NL80211_PLINK_CNF_RCVD:
505 /* confirm timer */
506 if (!reason)
507 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIRM_TIMEOUT);
508 sta->plink_state = NL80211_PLINK_HOLDING;
509 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
510 spin_unlock_bh(&sta->lock);
511 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
512 sta->sta.addr, llid, plid, reason);
513 break;
514 case NL80211_PLINK_HOLDING:
515 /* holding timer */
516 del_timer(&sta->plink_timer);
517 mesh_plink_fsm_restart(sta);
518 spin_unlock_bh(&sta->lock);
519 break;
520 default:
521 spin_unlock_bh(&sta->lock);
522 break;
523 }
524 }
525
526 #ifdef CONFIG_PM
527 void mesh_plink_quiesce(struct sta_info *sta)
528 {
529 if (del_timer_sync(&sta->plink_timer))
530 sta->plink_timer_was_running = true;
531 }
532
533 void mesh_plink_restart(struct sta_info *sta)
534 {
535 if (sta->plink_timer_was_running) {
536 add_timer(&sta->plink_timer);
537 sta->plink_timer_was_running = false;
538 }
539 }
540 #endif
541
542 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
543 {
544 sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
545 sta->plink_timer.data = (unsigned long) sta;
546 sta->plink_timer.function = mesh_plink_timer;
547 sta->plink_timeout = timeout;
548 add_timer(&sta->plink_timer);
549 }
550
551 int mesh_plink_open(struct sta_info *sta)
552 {
553 __le16 llid;
554 struct ieee80211_sub_if_data *sdata = sta->sdata;
555
556 if (!test_sta_flag(sta, WLAN_STA_AUTH))
557 return -EPERM;
558
559 spin_lock_bh(&sta->lock);
560 get_random_bytes(&llid, 2);
561 sta->llid = llid;
562 if (sta->plink_state != NL80211_PLINK_LISTEN &&
563 sta->plink_state != NL80211_PLINK_BLOCKED) {
564 spin_unlock_bh(&sta->lock);
565 return -EBUSY;
566 }
567 sta->plink_state = NL80211_PLINK_OPN_SNT;
568 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
569 spin_unlock_bh(&sta->lock);
570 mpl_dbg(sdata,
571 "Mesh plink: starting establishment with %pM\n",
572 sta->sta.addr);
573
574 return mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
575 sta->sta.addr, llid, 0, 0);
576 }
577
578 void mesh_plink_block(struct sta_info *sta)
579 {
580 struct ieee80211_sub_if_data *sdata = sta->sdata;
581 u32 changed;
582
583 spin_lock_bh(&sta->lock);
584 changed = __mesh_plink_deactivate(sta);
585 sta->plink_state = NL80211_PLINK_BLOCKED;
586 spin_unlock_bh(&sta->lock);
587
588 ieee80211_bss_info_change_notify(sdata, changed);
589 }
590
591
592 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt,
593 size_t len, struct ieee80211_rx_status *rx_status)
594 {
595 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
596 struct ieee802_11_elems elems;
597 struct sta_info *sta;
598 enum plink_event event;
599 enum ieee80211_self_protected_actioncode ftype;
600 size_t baselen;
601 bool matches_local = true;
602 u8 ie_len;
603 u8 *baseaddr;
604 u32 changed = 0;
605 __le16 plid, llid, reason;
606 static const char *mplstates[] = {
607 [NL80211_PLINK_LISTEN] = "LISTEN",
608 [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
609 [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
610 [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
611 [NL80211_PLINK_ESTAB] = "ESTAB",
612 [NL80211_PLINK_HOLDING] = "HOLDING",
613 [NL80211_PLINK_BLOCKED] = "BLOCKED"
614 };
615
616 /* need action_code, aux */
617 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
618 return;
619
620 if (is_multicast_ether_addr(mgmt->da)) {
621 mpl_dbg(sdata,
622 "Mesh plink: ignore frame from multicast address\n");
623 return;
624 }
625
626 baseaddr = mgmt->u.action.u.self_prot.variable;
627 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
628 if (mgmt->u.action.u.self_prot.action_code ==
629 WLAN_SP_MESH_PEERING_CONFIRM) {
630 baseaddr += 4;
631 baselen += 4;
632 }
633 ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
634 if (!elems.peering) {
635 mpl_dbg(sdata,
636 "Mesh plink: missing necessary peer link ie\n");
637 return;
638 }
639 if (elems.rsn_len &&
640 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
641 mpl_dbg(sdata,
642 "Mesh plink: can't establish link with secure peer\n");
643 return;
644 }
645
646 ftype = mgmt->u.action.u.self_prot.action_code;
647 ie_len = elems.peering_len;
648 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
649 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
650 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
651 && ie_len != 8)) {
652 mpl_dbg(sdata,
653 "Mesh plink: incorrect plink ie length %d %d\n",
654 ftype, ie_len);
655 return;
656 }
657
658 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
659 (!elems.mesh_id || !elems.mesh_config)) {
660 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
661 return;
662 }
663 /* Note the lines below are correct, the llid in the frame is the plid
664 * from the point of view of this host.
665 */
666 memcpy(&plid, PLINK_GET_LLID(elems.peering), 2);
667 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
668 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
669 memcpy(&llid, PLINK_GET_PLID(elems.peering), 2);
670
671 /* WARNING: Only for sta pointer, is dropped & re-acquired */
672 rcu_read_lock();
673
674 sta = sta_info_get(sdata, mgmt->sa);
675 if (!sta && ftype != WLAN_SP_MESH_PEERING_OPEN) {
676 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
677 rcu_read_unlock();
678 return;
679 }
680
681 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
682 !rssi_threshold_check(sta, sdata)) {
683 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
684 mgmt->sa);
685 rcu_read_unlock();
686 return;
687 }
688
689 if (sta && !test_sta_flag(sta, WLAN_STA_AUTH)) {
690 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
691 rcu_read_unlock();
692 return;
693 }
694
695 if (sta && sta->plink_state == NL80211_PLINK_BLOCKED) {
696 rcu_read_unlock();
697 return;
698 }
699
700 /* Now we will figure out the appropriate event... */
701 event = PLINK_UNDEFINED;
702 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
703 !mesh_matches_local(sdata, &elems)) {
704 matches_local = false;
705 switch (ftype) {
706 case WLAN_SP_MESH_PEERING_OPEN:
707 event = OPN_RJCT;
708 break;
709 case WLAN_SP_MESH_PEERING_CONFIRM:
710 event = CNF_RJCT;
711 break;
712 default:
713 break;
714 }
715 }
716
717 if (!sta && !matches_local) {
718 rcu_read_unlock();
719 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
720 llid = 0;
721 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
722 mgmt->sa, llid, plid, reason);
723 return;
724 } else if (!sta) {
725 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
726 if (!mesh_plink_free_count(sdata)) {
727 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
728 rcu_read_unlock();
729 return;
730 }
731 event = OPN_ACPT;
732 } else if (matches_local) {
733 switch (ftype) {
734 case WLAN_SP_MESH_PEERING_OPEN:
735 if (!mesh_plink_free_count(sdata) ||
736 (sta->plid && sta->plid != plid))
737 event = OPN_IGNR;
738 else
739 event = OPN_ACPT;
740 break;
741 case WLAN_SP_MESH_PEERING_CONFIRM:
742 if (!mesh_plink_free_count(sdata) ||
743 (sta->llid != llid || sta->plid != plid))
744 event = CNF_IGNR;
745 else
746 event = CNF_ACPT;
747 break;
748 case WLAN_SP_MESH_PEERING_CLOSE:
749 if (sta->plink_state == NL80211_PLINK_ESTAB)
750 /* Do not check for llid or plid. This does not
751 * follow the standard but since multiple plinks
752 * per sta are not supported, it is necessary in
753 * order to avoid a livelock when MP A sees an
754 * establish peer link to MP B but MP B does not
755 * see it. This can be caused by a timeout in
756 * B's peer link establishment or B beign
757 * restarted.
758 */
759 event = CLS_ACPT;
760 else if (sta->plid != plid)
761 event = CLS_IGNR;
762 else if (ie_len == 7 && sta->llid != llid)
763 event = CLS_IGNR;
764 else
765 event = CLS_ACPT;
766 break;
767 default:
768 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
769 rcu_read_unlock();
770 return;
771 }
772 }
773
774 if (event == OPN_ACPT) {
775 rcu_read_unlock();
776 /* allocate sta entry if necessary and update info */
777 sta = mesh_sta_info_get(sdata, mgmt->sa, &elems);
778 if (!sta) {
779 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
780 rcu_read_unlock();
781 return;
782 }
783 }
784
785 mpl_dbg(sdata,
786 "Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n",
787 mgmt->sa, mplstates[sta->plink_state],
788 le16_to_cpu(sta->llid), le16_to_cpu(sta->plid),
789 event);
790 reason = 0;
791 spin_lock_bh(&sta->lock);
792 switch (sta->plink_state) {
793 /* spin_unlock as soon as state is updated at each case */
794 case NL80211_PLINK_LISTEN:
795 switch (event) {
796 case CLS_ACPT:
797 mesh_plink_fsm_restart(sta);
798 spin_unlock_bh(&sta->lock);
799 break;
800 case OPN_ACPT:
801 sta->plink_state = NL80211_PLINK_OPN_RCVD;
802 sta->plid = plid;
803 get_random_bytes(&llid, 2);
804 sta->llid = llid;
805 mesh_plink_timer_set(sta,
806 mshcfg->dot11MeshRetryTimeout);
807 spin_unlock_bh(&sta->lock);
808 mesh_plink_frame_tx(sdata,
809 WLAN_SP_MESH_PEERING_OPEN,
810 sta->sta.addr, llid, 0, 0);
811 mesh_plink_frame_tx(sdata,
812 WLAN_SP_MESH_PEERING_CONFIRM,
813 sta->sta.addr, llid, plid, 0);
814 break;
815 default:
816 spin_unlock_bh(&sta->lock);
817 break;
818 }
819 break;
820
821 case NL80211_PLINK_OPN_SNT:
822 switch (event) {
823 case OPN_RJCT:
824 case CNF_RJCT:
825 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
826 case CLS_ACPT:
827 if (!reason)
828 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
829 sta->reason = reason;
830 sta->plink_state = NL80211_PLINK_HOLDING;
831 if (!mod_plink_timer(sta,
832 mshcfg->dot11MeshHoldingTimeout))
833 sta->ignore_plink_timer = true;
834
835 llid = sta->llid;
836 spin_unlock_bh(&sta->lock);
837 mesh_plink_frame_tx(sdata,
838 WLAN_SP_MESH_PEERING_CLOSE,
839 sta->sta.addr, llid, plid, reason);
840 break;
841 case OPN_ACPT:
842 /* retry timer is left untouched */
843 sta->plink_state = NL80211_PLINK_OPN_RCVD;
844 sta->plid = plid;
845 llid = sta->llid;
846 spin_unlock_bh(&sta->lock);
847 mesh_plink_frame_tx(sdata,
848 WLAN_SP_MESH_PEERING_CONFIRM,
849 sta->sta.addr, llid, plid, 0);
850 break;
851 case CNF_ACPT:
852 sta->plink_state = NL80211_PLINK_CNF_RCVD;
853 if (!mod_plink_timer(sta,
854 mshcfg->dot11MeshConfirmTimeout))
855 sta->ignore_plink_timer = true;
856
857 spin_unlock_bh(&sta->lock);
858 break;
859 default:
860 spin_unlock_bh(&sta->lock);
861 break;
862 }
863 break;
864
865 case NL80211_PLINK_OPN_RCVD:
866 switch (event) {
867 case OPN_RJCT:
868 case CNF_RJCT:
869 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
870 case CLS_ACPT:
871 if (!reason)
872 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
873 sta->reason = reason;
874 sta->plink_state = NL80211_PLINK_HOLDING;
875 if (!mod_plink_timer(sta,
876 mshcfg->dot11MeshHoldingTimeout))
877 sta->ignore_plink_timer = true;
878
879 llid = sta->llid;
880 spin_unlock_bh(&sta->lock);
881 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
882 sta->sta.addr, llid, plid, reason);
883 break;
884 case OPN_ACPT:
885 llid = sta->llid;
886 spin_unlock_bh(&sta->lock);
887 mesh_plink_frame_tx(sdata,
888 WLAN_SP_MESH_PEERING_CONFIRM,
889 sta->sta.addr, llid, plid, 0);
890 break;
891 case CNF_ACPT:
892 del_timer(&sta->plink_timer);
893 sta->plink_state = NL80211_PLINK_ESTAB;
894 spin_unlock_bh(&sta->lock);
895 changed |= mesh_plink_inc_estab_count(sdata);
896 changed |= mesh_set_ht_prot_mode(sdata);
897 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n",
898 sta->sta.addr);
899 break;
900 default:
901 spin_unlock_bh(&sta->lock);
902 break;
903 }
904 break;
905
906 case NL80211_PLINK_CNF_RCVD:
907 switch (event) {
908 case OPN_RJCT:
909 case CNF_RJCT:
910 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
911 case CLS_ACPT:
912 if (!reason)
913 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
914 sta->reason = reason;
915 sta->plink_state = NL80211_PLINK_HOLDING;
916 if (!mod_plink_timer(sta,
917 mshcfg->dot11MeshHoldingTimeout))
918 sta->ignore_plink_timer = true;
919
920 llid = sta->llid;
921 spin_unlock_bh(&sta->lock);
922 mesh_plink_frame_tx(sdata,
923 WLAN_SP_MESH_PEERING_CLOSE,
924 sta->sta.addr, llid, plid, reason);
925 break;
926 case OPN_ACPT:
927 del_timer(&sta->plink_timer);
928 sta->plink_state = NL80211_PLINK_ESTAB;
929 spin_unlock_bh(&sta->lock);
930 changed |= mesh_plink_inc_estab_count(sdata);
931 changed |= mesh_set_ht_prot_mode(sdata);
932 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n",
933 sta->sta.addr);
934 mesh_plink_frame_tx(sdata,
935 WLAN_SP_MESH_PEERING_CONFIRM,
936 sta->sta.addr, llid, plid, 0);
937 break;
938 default:
939 spin_unlock_bh(&sta->lock);
940 break;
941 }
942 break;
943
944 case NL80211_PLINK_ESTAB:
945 switch (event) {
946 case CLS_ACPT:
947 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
948 sta->reason = reason;
949 changed |= __mesh_plink_deactivate(sta);
950 sta->plink_state = NL80211_PLINK_HOLDING;
951 llid = sta->llid;
952 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
953 spin_unlock_bh(&sta->lock);
954 changed |= mesh_set_ht_prot_mode(sdata);
955 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
956 sta->sta.addr, llid, plid, reason);
957 break;
958 case OPN_ACPT:
959 llid = sta->llid;
960 spin_unlock_bh(&sta->lock);
961 mesh_plink_frame_tx(sdata,
962 WLAN_SP_MESH_PEERING_CONFIRM,
963 sta->sta.addr, llid, plid, 0);
964 break;
965 default:
966 spin_unlock_bh(&sta->lock);
967 break;
968 }
969 break;
970 case NL80211_PLINK_HOLDING:
971 switch (event) {
972 case CLS_ACPT:
973 if (del_timer(&sta->plink_timer))
974 sta->ignore_plink_timer = 1;
975 mesh_plink_fsm_restart(sta);
976 spin_unlock_bh(&sta->lock);
977 break;
978 case OPN_ACPT:
979 case CNF_ACPT:
980 case OPN_RJCT:
981 case CNF_RJCT:
982 llid = sta->llid;
983 reason = sta->reason;
984 spin_unlock_bh(&sta->lock);
985 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
986 sta->sta.addr, llid, plid, reason);
987 break;
988 default:
989 spin_unlock_bh(&sta->lock);
990 }
991 break;
992 default:
993 /* should not get here, PLINK_BLOCKED is dealt with at the
994 * beginning of the function
995 */
996 spin_unlock_bh(&sta->lock);
997 break;
998 }
999
1000 rcu_read_unlock();
1001
1002 if (changed)
1003 ieee80211_bss_info_change_notify(sdata, changed);
1004 }
Linux kernel - Deliverables
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