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Merge tag 'cramfs_fixes' of git://git.linaro.org/people/nicolas.pitre/linux
[linux-2.6-block.git] / net / mac80211 / mesh_plink.c
CommitLineData
c3896d2c 1/*
264d9b7d 2 * Copyright (c) 2008, 2009 open80211s Ltd.
c3896d2c
LCC		 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 */
5a0e3ad6 9#include <linux/gfp.h>
902acc78
JB		 10#include <linux/kernel.h>
11#include <linux/random.h>
b2d09103
IM		 12#include <linux/rculist.h>
13
c3896d2c 14#include "ieee80211_i.h"
2c8dccc7 15#include "rate.h"
c3896d2c 16#include "mesh.h"
c3896d2c 17
a69bd8e6 18#define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2)
8db09850
TP		 19#define PLINK_GET_LLID(p) (p + 2)
20#define PLINK_GET_PLID(p) (p + 4)
c3896d2c 21
433f5bc1 22#define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \
cc57ac53 23 jiffies + msecs_to_jiffies(t)))
c3896d2c 24
c3896d2c
LCC		 25enum plink_event {
26 PLINK_UNDEFINED,
27 OPN_ACPT,
28 OPN_RJCT,
29 OPN_IGNR,
30 CNF_ACPT,
31 CNF_RJCT,
32 CNF_IGNR,
33 CLS_ACPT,
34 CLS_IGNR
35};
36
95e48add
TP		 37static const char * const mplstates[] = {
38 [NL80211_PLINK_LISTEN] = "LISTEN",
39 [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
40 [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
41 [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
42 [NL80211_PLINK_ESTAB] = "ESTAB",
43 [NL80211_PLINK_HOLDING] = "HOLDING",
44 [NL80211_PLINK_BLOCKED] = "BLOCKED"
45};
46
47static const char * const mplevents[] = {
48 [PLINK_UNDEFINED] = "NONE",
49 [OPN_ACPT] = "OPN_ACPT",
50 [OPN_RJCT] = "OPN_RJCT",
51 [OPN_IGNR] = "OPN_IGNR",
52 [CNF_ACPT] = "CNF_ACPT",
53 [CNF_RJCT] = "CNF_RJCT",
54 [CNF_IGNR] = "CNF_IGNR",
55 [CLS_ACPT] = "CLS_ACPT",
56 [CLS_IGNR] = "CLS_IGNR"
57};
58
36c9bb29
BC		 59/* We only need a valid sta if user configured a minimum rssi_threshold. */
60static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
61 struct sta_info *sta)
62{
63 s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
64 return rssi_threshold == 0 ||
e5a9f8d0 65 (sta &&
0be6ed13 66 (s8)-ewma_signal_read(&sta->rx_stats_avg.signal) >
e5a9f8d0 67 rssi_threshold);
36c9bb29
BC		 68}
69
c3896d2c
LCC		 70/**
71 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
72 *
23c7a29c 73 * @sta: mesh peer link to restart
c3896d2c 74 *
433f5bc1 75 * Locking: this function must be called holding sta->mesh->plink_lock
c3896d2c
LCC		 76 */
77static inline void mesh_plink_fsm_restart(struct sta_info *sta)
78{
433f5bc1
JB		 79 lockdep_assert_held(&sta->mesh->plink_lock);
80 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
81 sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0;
82 sta->mesh->plink_retries = 0;
c3896d2c
LCC		 83}
84
3b144658
TP		 85/*
86 * mesh_set_short_slot_time - enable / disable ERP short slot time.
87 *
88 * The standard indirectly mandates mesh STAs to turn off short slot time by
89 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
90 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
91 * MBSS support ERP rates.
92 *
93 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
94 */
95static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
96{
97 struct ieee80211_local *local = sdata->local;
21a8e9dd 98 struct ieee80211_supported_band *sband;
3b144658
TP		 99 struct sta_info *sta;
100 u32 erp_rates = 0, changed = 0;
101 int i;
102 bool short_slot = false;
103
21a8e9dd
MSS		 104 sband = ieee80211_get_sband(sdata);
105 if (!sband)
106 return changed;
107
108 if (sband->band == NL80211_BAND_5GHZ) {
3b144658
TP		 109 /* (IEEE 802.11-2012 19.4.5) */
110 short_slot = true;
111 goto out;
21a8e9dd 112 } else if (sband->band != NL80211_BAND_2GHZ) {
3b144658 113 goto out;
21a8e9dd 114 }
3b144658
TP		 115
116 for (i = 0; i < sband->n_bitrates; i++)
117 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
118 erp_rates |= BIT(i);
119
120 if (!erp_rates)
121 goto out;
122
123 rcu_read_lock();
124 list_for_each_entry_rcu(sta, &local->sta_list, list) {
125 if (sdata != sta->sdata ||
433f5bc1 126 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
3b144658
TP		 127 continue;
128
129 short_slot = false;
21a8e9dd 130 if (erp_rates & sta->sta.supp_rates[sband->band])
3b144658
TP		 131 short_slot = true;
132 else
133 break;
134 }
135 rcu_read_unlock();
136
137out:
138 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
139 sdata->vif.bss_conf.use_short_slot = short_slot;
140 changed = BSS_CHANGED_ERP_SLOT;
141 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
142 sdata->vif.addr, short_slot);
143 }
144 return changed;
145}
146
2c53040f 147/**
cbf9322e 148 * mesh_set_ht_prot_mode - set correct HT protection mode
57aac7c5 149 *
cbf9322e
AN		 150 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
151 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
152 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
153 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
154 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
155 * HT20 peer is present. Otherwise no-protection mode is selected.
57aac7c5
AN		 156 */
157static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
158{
159 struct ieee80211_local *local = sdata->local;
160 struct sta_info *sta;
57aac7c5
AN		 161 u16 ht_opmode;
162 bool non_ht_sta = false, ht20_sta = false;
163
0418a445
SW		 164 switch (sdata->vif.bss_conf.chandef.width) {
165 case NL80211_CHAN_WIDTH_20_NOHT:
166 case NL80211_CHAN_WIDTH_5:
167 case NL80211_CHAN_WIDTH_10:
57aac7c5 168 return 0;
0418a445
SW		 169 default:
170 break;
171 }
57aac7c5
AN		 172
173 rcu_read_lock();
174 list_for_each_entry_rcu(sta, &local->sta_list, list) {
cbf9322e 175 if (sdata != sta->sdata ||
433f5bc1 176 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
cbf9322e
AN		 177 continue;
178
52ac8c48
TP		 179 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
180 continue;
181
182 if (!sta->sta.ht_cap.ht_supported) {
183 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
184 sta->sta.addr);
cbf9322e 185 non_ht_sta = true;
cbf9322e 186 break;
57aac7c5 187 }
52ac8c48
TP		 188
189 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
190 ht20_sta = true;
57aac7c5 191 }
57aac7c5
AN		 192 rcu_read_unlock();
193
194 if (non_ht_sta)
195 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
466f310d 196 else if (ht20_sta &&
4bf88530 197 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
57aac7c5
AN		 198 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
199 else
200 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
201
52ac8c48
TP		 202 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
203 return 0;
57aac7c5 204
52ac8c48
TP		 205 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
206 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
207 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
208 return BSS_CHANGED_HT;
57aac7c5
AN		 209}
210
f698d856 211static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
a69bd8e6 212 struct sta_info *sta,
bf7cd94d 213 enum ieee80211_self_protected_actioncode action,
6f101ef0 214 u8 *da, u16 llid, u16 plid, u16 reason)
bf7cd94d 215{
f698d856 216 struct ieee80211_local *local = sdata->local;
3b69a9c5 217 struct sk_buff *skb;
e7570dfb 218 struct ieee80211_tx_info *info;
c3896d2c
LCC		 219 struct ieee80211_mgmt *mgmt;
220 bool include_plid = false;
8db09850 221 u16 peering_proto = 0;
3b69a9c5 222 u8 *pos, ie_len = 4;
4c121fd6 223 int hdr_len = offsetofend(struct ieee80211_mgmt, u.action.u.self_prot);
f609a43d 224 int err = -ENOMEM;
3b69a9c5 225
65e8b0cc 226 skb = dev_alloc_skb(local->tx_headroom +
3b69a9c5
TP		 227 hdr_len +
228 2 + /* capability info */
229 2 + /* AID */
230 2 + 8 + /* supported rates */
231 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
232 2 + sdata->u.mesh.mesh_id_len +
233 2 + sizeof(struct ieee80211_meshconf_ie) +
176f3608 234 2 + sizeof(struct ieee80211_ht_cap) +
074d46d1 235 2 + sizeof(struct ieee80211_ht_operation) +
c85fb53c
BC		 236 2 + sizeof(struct ieee80211_vht_cap) +
237 2 + sizeof(struct ieee80211_vht_operation) +
3b69a9c5
TP		 238 2 + 8 + /* peering IE */
239 sdata->u.mesh.ie_len);
c3896d2c 240 if (!skb)
87d84c45 241 return err;
e7570dfb 242 info = IEEE80211_SKB_CB(skb);
65e8b0cc 243 skb_reserve(skb, local->tx_headroom);
b080db58 244 mgmt = skb_put_zero(skb, hdr_len);
e7827a70
HH		 245 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
246 IEEE80211_STYPE_ACTION);
c3896d2c 247 memcpy(mgmt->da, da, ETH_ALEN);
47846c9b 248 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
915b5c50 249 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
8db09850
TP		 250 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
251 mgmt->u.action.u.self_prot.action_code = action;
c3896d2c 252
8db09850 253 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
21a8e9dd
MSS		 254 struct ieee80211_supported_band *sband;
255 enum nl80211_band band;
256
257 sband = ieee80211_get_sband(sdata);
258 if (!sband) {
259 err = -EINVAL;
260 goto free;
261 }
262 band = sband->band;
55de908a 263
8db09850 264 /* capability info */
e45a79da 265 pos = skb_put_zero(skb, 2);
54ef656b 266 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
8db09850
TP		 267 /* AID */
268 pos = skb_put(skb, 2);
a69bd8e6 269 put_unaligned_le16(sta->sta.aid, pos);
c3896d2c 270 }
55de908a
JB		 271 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
272 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
bf7cd94d
JB		 273 mesh_add_rsn_ie(sdata, skb) ||
274 mesh_add_meshid_ie(sdata, skb) ||
275 mesh_add_meshconf_ie(sdata, skb))
f609a43d 276 goto free;
8db09850 277 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
e7570dfb 278 info->flags |= IEEE80211_TX_CTL_NO_ACK;
bf7cd94d 279 if (mesh_add_meshid_ie(sdata, skb))
f609a43d 280 goto free;
c3896d2c
LCC		 281 }
282
8db09850 283 /* Add Mesh Peering Management element */
c3896d2c 284 switch (action) {
54ef656b 285 case WLAN_SP_MESH_PEERING_OPEN:
c3896d2c 286 break;
54ef656b 287 case WLAN_SP_MESH_PEERING_CONFIRM:
8db09850 288 ie_len += 2;
c3896d2c
LCC		 289 include_plid = true;
290 break;
54ef656b 291 case WLAN_SP_MESH_PEERING_CLOSE:
8db09850
TP		 292 if (plid) {
293 ie_len += 2;
c3896d2c
LCC		 294 include_plid = true;
295 }
8db09850 296 ie_len += 2; /* reason code */
c3896d2c 297 break;
8db09850 298 default:
f609a43d
TP		 299 err = -EINVAL;
300 goto free;
c3896d2c
LCC		 301 }
302
8db09850 303 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
f609a43d 304 goto free;
8db09850 305
c3896d2c 306 pos = skb_put(skb, 2 + ie_len);
8db09850 307 *pos++ = WLAN_EID_PEER_MGMT;
c3896d2c 308 *pos++ = ie_len;
8db09850
TP		 309 memcpy(pos, &peering_proto, 2);
310 pos += 2;
6f101ef0 311 put_unaligned_le16(llid, pos);
8db09850 312 pos += 2;
c3896d2c 313 if (include_plid) {
6f101ef0 314 put_unaligned_le16(plid, pos);
8db09850 315 pos += 2;
c3896d2c 316 }
54ef656b 317 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
6f101ef0 318 put_unaligned_le16(reason, pos);
8db09850 319 pos += 2;
c3896d2c 320 }
176f3608
TP		 321
322 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
bf7cd94d 323 if (mesh_add_ht_cap_ie(sdata, skb) ||
c85fb53c
BC		 324 mesh_add_ht_oper_ie(sdata, skb) ||
325 mesh_add_vht_cap_ie(sdata, skb) ||
326 mesh_add_vht_oper_ie(sdata, skb))
f609a43d 327 goto free;
176f3608
TP		 328 }
329
bf7cd94d 330 if (mesh_add_vendor_ies(sdata, skb))
f609a43d 331 goto free;
c3896d2c 332
62ae67be 333 ieee80211_tx_skb(sdata, skb);
c3896d2c 334 return 0;
f609a43d
TP		 335free:
336 kfree_skb(skb);
337 return err;
c3896d2c
LCC		 338}
339
fa87a656
BC		 340/**
341 * __mesh_plink_deactivate - deactivate mesh peer link
342 *
343 * @sta: mesh peer link to deactivate
344 *
e596af82
BC		 345 * Mesh paths with this peer as next hop should be flushed
346 * by the caller outside of plink_lock.
347 *
fa87a656
BC		 348 * Returns beacon changed flag if the beacon content changed.
349 *
350 * Locking: the caller must hold sta->mesh->plink_lock
351 */
352static u32 __mesh_plink_deactivate(struct sta_info *sta)
353{
354 struct ieee80211_sub_if_data *sdata = sta->sdata;
355 u32 changed = 0;
356
357 lockdep_assert_held(&sta->mesh->plink_lock);
358
359 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
360 changed = mesh_plink_dec_estab_count(sdata);
361 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
fa87a656
BC		 362
363 ieee80211_mps_sta_status_update(sta);
364 changed |= ieee80211_mps_set_sta_local_pm(sta,
365 NL80211_MESH_POWER_UNKNOWN);
366
367 return changed;
368}
369
370/**
371 * mesh_plink_deactivate - deactivate mesh peer link
372 *
373 * @sta: mesh peer link to deactivate
374 *
375 * All mesh paths with this peer as next hop will be flushed
376 */
377u32 mesh_plink_deactivate(struct sta_info *sta)
378{
379 struct ieee80211_sub_if_data *sdata = sta->sdata;
380 u32 changed;
381
382 spin_lock_bh(&sta->mesh->plink_lock);
383 changed = __mesh_plink_deactivate(sta);
efc401f4
BC		 384
385 if (!sdata->u.mesh.user_mpm) {
386 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
387 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
388 sta->sta.addr, sta->mesh->llid,
389 sta->mesh->plid, sta->mesh->reason);
390 }
fa87a656 391 spin_unlock_bh(&sta->mesh->plink_lock);
efc401f4
BC		 392 if (!sdata->u.mesh.user_mpm)
393 del_timer_sync(&sta->mesh->plink_timer);
e596af82 394 mesh_path_flush_by_nexthop(sta);
fa87a656 395
efc401f4
BC		 396 /* make sure no readers can access nexthop sta from here on */
397 synchronize_net();
398
fa87a656
BC		 399 return changed;
400}
401
296fcba3
TP		 402static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
403 struct sta_info *sta,
1d6741d8 404 struct ieee802_11_elems *elems)
c3896d2c 405{
f698d856 406 struct ieee80211_local *local = sdata->local;
54ab1ffb 407 struct ieee80211_supported_band *sband;
f68d776a 408 u32 rates, basic_rates = 0, changed = 0;
abcff6ef 409 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
c3896d2c 410
21a8e9dd
MSS		 411 sband = ieee80211_get_sband(sdata);
412 if (!sband)
413 return;
414
415 rates = ieee80211_sta_get_rates(sdata, elems, sband->band,
416 &basic_rates);
d0709a65 417
433f5bc1 418 spin_lock_bh(&sta->mesh->plink_lock);
e5a9f8d0 419 sta->rx_stats.last_rx = jiffies;
296fcba3
TP		 420
421 /* rates and capabilities don't change during peering */
433f5bc1
JB		 422 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
423 sta->mesh->processed_beacon)
296fcba3 424 goto out;
433f5bc1 425 sta->mesh->processed_beacon = true;
bae35d92 426
21a8e9dd 427 if (sta->sta.supp_rates[sband->band] != rates)
f68d776a 428 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
21a8e9dd 429 sta->sta.supp_rates[sband->band] = rates;
54ab1ffb 430
52ac8c48
TP		 431 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
432 elems->ht_cap_elem, sta))
433 changed |= IEEE80211_RC_BW_CHANGED;
4bf88530 434
c85fb53c
BC		 435 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
436 elems->vht_cap_elem, sta);
437
abcff6ef
JD		 438 if (bw != sta->sta.bandwidth)
439 changed |= IEEE80211_RC_BW_CHANGED;
440
52ac8c48
TP		 441 /* HT peer is operating 20MHz-only */
442 if (elems->ht_operation &&
443 !(elems->ht_operation->ht_param &
444 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
445 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
f68d776a 446 changed |= IEEE80211_RC_BW_CHANGED;
52ac8c48 447 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
57aac7c5 448 }
c7d25828 449
1d6741d8 450 if (!test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
59cf1d65 451 rate_control_rate_init(sta);
f68d776a
TP		 452 else
453 rate_control_rate_update(local, sband, sta, changed);
296fcba3 454out:
433f5bc1 455 spin_unlock_bh(&sta->mesh->plink_lock);
296fcba3
TP		 456}
457
0e0060fc
BC		 458static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
459{
460 struct sta_info *sta;
461 unsigned long *aid_map;
462 int aid;
463
464 aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
465 sizeof(*aid_map), GFP_KERNEL);
466 if (!aid_map)
467 return -ENOMEM;
468
469 /* reserve aid 0 for mcast indication */
470 __set_bit(0, aid_map);
471
472 rcu_read_lock();
473 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
474 __set_bit(sta->sta.aid, aid_map);
475 rcu_read_unlock();
476
477 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
478 kfree(aid_map);
479
480 if (aid > IEEE80211_MAX_AID)
481 return -ENOBUFS;
482
483 return aid;
484}
485
296fcba3
TP		 486static struct sta_info *
487__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
488{
489 struct sta_info *sta;
0e0060fc 490 int aid;
54ab1ffb 491
296fcba3 492 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
e87278e7
TP		 493 return NULL;
494
0e0060fc
BC		 495 aid = mesh_allocate_aid(sdata);
496 if (aid < 0)
497 return NULL;
498
296fcba3
TP		 499 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
500 if (!sta)
501 return NULL;
502
433f5bc1 503 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
a74a8c84 504 sta->sta.wme = true;
0e0060fc 505 sta->sta.aid = aid;
296fcba3
TP		 506
507 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
508 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
509 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
510
296fcba3
TP		 511 return sta;
512}
513
514static struct sta_info *
515mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
516 struct ieee802_11_elems *elems)
517{
518 struct sta_info *sta = NULL;
519
a6dad6a2
TP		 520 /* Userspace handles station allocation */
521 if (sdata->u.mesh.user_mpm ||
11197d00
MH		 522 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
523 if (mesh_peer_accepts_plinks(elems) &&
524 mesh_plink_availables(sdata))
525 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
526 elems->ie_start,
527 elems->total_len,
528 GFP_KERNEL);
529 } else
296fcba3
TP		 530 sta = __mesh_sta_info_alloc(sdata, addr);
531
54ab1ffb
TP		 532 return sta;
533}
534
296fcba3
TP		 535/*
536 * mesh_sta_info_get - return mesh sta info entry for @addr.
537 *
538 * @sdata: local meshif
539 * @addr: peer's address
540 * @elems: IEs from beacon or mesh peering frame.
541 *
542 * Return existing or newly allocated sta_info under RCU read lock.
543 * (re)initialize with given IEs.
544 */
545static struct sta_info *
546mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
547 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
548{
549 struct sta_info *sta = NULL;
550
551 rcu_read_lock();
552 sta = sta_info_get(sdata, addr);
553 if (sta) {
1d6741d8 554 mesh_sta_info_init(sdata, sta, elems);
296fcba3
TP		 555 } else {
556 rcu_read_unlock();
557 /* can't run atomic */
558 sta = mesh_sta_info_alloc(sdata, addr, elems);
559 if (!sta) {
560 rcu_read_lock();
561 return NULL;
562 }
563
1d6741d8 564 mesh_sta_info_init(sdata, sta, elems);
3b4797bc 565
296fcba3
TP		 566 if (sta_info_insert_rcu(sta))
567 return NULL;
568 }
569
570 return sta;
571}
572
573/*
574 * mesh_neighbour_update - update or initialize new mesh neighbor.
575 *
576 * @sdata: local meshif
577 * @addr: peer's address
578 * @elems: IEs from beacon or mesh peering frame
579 *
580 * Initiates peering if appropriate.
581 */
f743ff49
TP		 582void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
583 u8 *hw_addr,
54ab1ffb
TP		 584 struct ieee802_11_elems *elems)
585{
586 struct sta_info *sta;
39886b61 587 u32 changed = 0;
54ab1ffb 588
296fcba3 589 sta = mesh_sta_info_get(sdata, hw_addr, elems);
54ab1ffb
TP		 590 if (!sta)
591 goto out;
592
1570ca59 593 if (mesh_peer_accepts_plinks(elems) &&
433f5bc1 594 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
54ab1ffb
TP		 595 sdata->u.mesh.accepting_plinks &&
596 sdata->u.mesh.mshcfg.auto_open_plinks &&
36c9bb29 597 rssi_threshold_check(sdata, sta))
39886b61 598 changed = mesh_plink_open(sta);
c3896d2c 599
3f52b7e3 600 ieee80211_mps_frame_release(sta, elems);
54ab1ffb 601out:
d0709a65 602 rcu_read_unlock();
2b5e1967 603 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c
LCC		 604}
605
4c02d62f 606void mesh_plink_timer(struct timer_list *t)
c3896d2c 607{
4c02d62f 608 struct mesh_sta *mesh = from_timer(mesh, t, plink_timer);
c3896d2c 609 struct sta_info *sta;
6f101ef0 610 u16 reason = 0;
c3896d2c 611 struct ieee80211_sub_if_data *sdata;
453e66f2 612 struct mesh_config *mshcfg;
4efec451 613 enum ieee80211_self_protected_actioncode action = 0;
c3896d2c 614
d0709a65
JB		 615 /*
616 * This STA is valid because sta_info_destroy() will
617 * del_timer_sync() this timer after having made sure
618 * it cannot be readded (by deleting the plink.)
619 */
4c02d62f 620 sta = mesh->plink_sta;
c3896d2c 621
690205f1 622 if (sta->sdata->local->quiescing)
5bb644a0 623 return;
5bb644a0 624
433f5bc1 625 spin_lock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 626
627 /* If a timer fires just before a state transition on another CPU,
628 * we may have already extended the timeout and changed state by the
629 * time we've acquired the lock and arrived here. In that case,
630 * skip this timer and wait for the new one.
631 */
433f5bc1 632 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
2b470c39
BC		 633 mpl_dbg(sta->sdata,
634 "Ignoring timer for %pM in state %s (timer adjusted)",
433f5bc1
JB		 635 sta->sta.addr, mplstates[sta->mesh->plink_state]);
636 spin_unlock_bh(&sta->mesh->plink_lock);
c3896d2c
LCC		 637 return;
638 }
2b470c39
BC		 639
640 /* del_timer() and handler may race when entering these states */
433f5bc1
JB		 641 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
642 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
2b470c39
BC		 643 mpl_dbg(sta->sdata,
644 "Ignoring timer for %pM in state %s (timer deleted)",
433f5bc1
JB		 645 sta->sta.addr, mplstates[sta->mesh->plink_state]);
646 spin_unlock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 647 return;
648 }
649
bdcbd8e0 650 mpl_dbg(sta->sdata,
3088f7d2 651 "Mesh plink timer for %pM fired on state %s\n",
433f5bc1 652 sta->sta.addr, mplstates[sta->mesh->plink_state]);
d0709a65 653 sdata = sta->sdata;
453e66f2 654 mshcfg = &sdata->u.mesh.mshcfg;
c3896d2c 655
433f5bc1 656 switch (sta->mesh->plink_state) {
57cf8043
JC		 657 case NL80211_PLINK_OPN_RCVD:
658 case NL80211_PLINK_OPN_SNT:
c3896d2c 659 /* retry timer */
433f5bc1 660 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
c3896d2c 661 u32 rand;
bdcbd8e0
JB		 662 mpl_dbg(sta->sdata,
663 "Mesh plink for %pM (retry, timeout): %d %d\n",
433f5bc1
JB		 664 sta->sta.addr, sta->mesh->plink_retries,
665 sta->mesh->plink_timeout);
c3896d2c 666 get_random_bytes(&rand, sizeof(u32));
433f5bc1
JB		 667 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
668 rand % sta->mesh->plink_timeout;
669 ++sta->mesh->plink_retries;
670 mod_plink_timer(sta, sta->mesh->plink_timeout);
4efec451 671 action = WLAN_SP_MESH_PEERING_OPEN;
c3896d2c
LCC		 672 break;
673 }
6f101ef0 674 reason = WLAN_REASON_MESH_MAX_RETRIES;
02049ce2 675 /* fall through */
57cf8043 676 case NL80211_PLINK_CNF_RCVD:
c3896d2c
LCC		 677 /* confirm timer */
678 if (!reason)
6f101ef0 679 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
433f5bc1 680 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
453e66f2 681 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
4efec451 682 action = WLAN_SP_MESH_PEERING_CLOSE;
c3896d2c 683 break;
57cf8043 684 case NL80211_PLINK_HOLDING:
c3896d2c 685 /* holding timer */
433f5bc1 686 del_timer(&sta->mesh->plink_timer);
c3896d2c 687 mesh_plink_fsm_restart(sta);
c3896d2c
LCC		 688 break;
689 default:
c3896d2c
LCC		 690 break;
691 }
433f5bc1 692 spin_unlock_bh(&sta->mesh->plink_lock);
4efec451 693 if (action)
a69bd8e6 694 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1 695 sta->mesh->llid, sta->mesh->plid, reason);
c3896d2c
LCC		 696}
697
0df2f6c1 698static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
c3896d2c 699{
433f5bc1 700 sta->mesh->plink_timeout = timeout;
4c02d62f 701 mod_timer(&sta->mesh->plink_timer, jiffies + msecs_to_jiffies(timeout));
c3896d2c
LCC		 702}
703
204d1304 704static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
6f101ef0 705 u16 llid)
204d1304
TP		 706{
707 struct ieee80211_local *local = sdata->local;
708 bool in_use = false;
709 struct sta_info *sta;
710
711 rcu_read_lock();
712 list_for_each_entry_rcu(sta, &local->sta_list, list) {
520c75dc
MS		 713 if (sdata != sta->sdata)
714 continue;
715
433f5bc1 716 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
204d1304
TP		 717 in_use = true;
718 break;
719 }
720 }
721 rcu_read_unlock();
722
723 return in_use;
724}
725
6f101ef0 726static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
204d1304
TP		 727{
728 u16 llid;
729
730 do {
731 get_random_bytes(&llid, sizeof(llid));
6f101ef0 732 } while (llid_in_use(sdata, llid));
204d1304 733
6f101ef0 734 return llid;
204d1304
TP		 735}
736
39886b61 737u32 mesh_plink_open(struct sta_info *sta)
c3896d2c 738{
d0709a65 739 struct ieee80211_sub_if_data *sdata = sta->sdata;
39886b61 740 u32 changed;
c3896d2c 741
c2c98fde 742 if (!test_sta_flag(sta, WLAN_STA_AUTH))
39886b61 743 return 0;
53e80511 744
433f5bc1
JB		 745 spin_lock_bh(&sta->mesh->plink_lock);
746 sta->mesh->llid = mesh_get_new_llid(sdata);
747 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
748 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
749 spin_unlock_bh(&sta->mesh->plink_lock);
39886b61 750 return 0;
c3896d2c 751 }
433f5bc1 752 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
453e66f2 753 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
433f5bc1 754 spin_unlock_bh(&sta->mesh->plink_lock);
bdcbd8e0
JB		 755 mpl_dbg(sdata,
756 "Mesh plink: starting establishment with %pM\n",
0c68ae26 757 sta->sta.addr);
c3896d2c 758
3f52b7e3 759 /* set the non-peer mode to active during peering */
39886b61 760 changed = ieee80211_mps_local_status_update(sdata);
3f52b7e3 761
a69bd8e6 762 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
433f5bc1 763 sta->sta.addr, sta->mesh->llid, 0, 0);
39886b61 764 return changed;
c3896d2c
LCC		 765}
766
39886b61 767u32 mesh_plink_block(struct sta_info *sta)
c3896d2c 768{
df323818 769 u32 changed;
c9370197 770
433f5bc1 771 spin_lock_bh(&sta->mesh->plink_lock);
df323818 772 changed = __mesh_plink_deactivate(sta);
433f5bc1
JB		 773 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
774 spin_unlock_bh(&sta->mesh->plink_lock);
e596af82 775 mesh_path_flush_by_nexthop(sta);
c9370197 776
39886b61 777 return changed;
c3896d2c
LCC		 778}
779
e76d67f0
BC		 780static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
781 struct sta_info *sta,
782 enum plink_event event)
783{
784 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
6f101ef0
CYY		 785 u16 reason = (event == CLS_ACPT) ?
786 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
e76d67f0 787
433f5bc1
JB		 788 sta->mesh->reason = reason;
789 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
272a9e26 790 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
e76d67f0
BC		 791}
792
793static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
794 struct sta_info *sta)
795{
796 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
797 u32 changed = 0;
798
433f5bc1
JB		 799 del_timer(&sta->mesh->plink_timer);
800 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
e76d67f0
BC		 801 changed |= mesh_plink_inc_estab_count(sdata);
802 changed |= mesh_set_ht_prot_mode(sdata);
803 changed |= mesh_set_short_slot_time(sdata);
804 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
805 ieee80211_mps_sta_status_update(sta);
806 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
807 return changed;
808}
809
c7e67811
TP		 810/**
811 * mesh_plink_fsm - step @sta MPM based on @event
812 *
813 * @sdata: interface
814 * @sta: mesh neighbor
815 * @event: peering event
816 *
817 * Return: changed MBSS flags
818 */
819static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
820 struct sta_info *sta, enum plink_event event)
821{
822 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
823 enum ieee80211_self_protected_actioncode action = 0;
824 u32 changed = 0;
e596af82 825 bool flush = false;
c7e67811
TP		 826
827 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
433f5bc1 828 mplstates[sta->mesh->plink_state], mplevents[event]);
c7e67811 829
433f5bc1
JB		 830 spin_lock_bh(&sta->mesh->plink_lock);
831 switch (sta->mesh->plink_state) {
c7e67811
TP		 832 case NL80211_PLINK_LISTEN:
833 switch (event) {
834 case CLS_ACPT:
835 mesh_plink_fsm_restart(sta);
836 break;
837 case OPN_ACPT:
433f5bc1
JB		 838 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
839 sta->mesh->llid = mesh_get_new_llid(sdata);
c7e67811
TP		 840 mesh_plink_timer_set(sta,
841 mshcfg->dot11MeshRetryTimeout);
842
843 /* set the non-peer mode to active during peering */
844 changed |= ieee80211_mps_local_status_update(sdata);
845 action = WLAN_SP_MESH_PEERING_OPEN;
846 break;
847 default:
848 break;
849 }
850 break;
851 case NL80211_PLINK_OPN_SNT:
852 switch (event) {
853 case OPN_RJCT:
854 case CNF_RJCT:
855 case CLS_ACPT:
856 mesh_plink_close(sdata, sta, event);
857 action = WLAN_SP_MESH_PEERING_CLOSE;
858 break;
859 case OPN_ACPT:
860 /* retry timer is left untouched */
433f5bc1 861 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
c7e67811
TP		 862 action = WLAN_SP_MESH_PEERING_CONFIRM;
863 break;
864 case CNF_ACPT:
433f5bc1 865 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
2b470c39 866 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
c7e67811
TP		 867 break;
868 default:
869 break;
870 }
871 break;
872 case NL80211_PLINK_OPN_RCVD:
873 switch (event) {
874 case OPN_RJCT:
875 case CNF_RJCT:
876 case CLS_ACPT:
877 mesh_plink_close(sdata, sta, event);
878 action = WLAN_SP_MESH_PEERING_CLOSE;
879 break;
880 case OPN_ACPT:
881 action = WLAN_SP_MESH_PEERING_CONFIRM;
882 break;
883 case CNF_ACPT:
884 changed |= mesh_plink_establish(sdata, sta);
885 break;
886 default:
887 break;
888 }
889 break;
890 case NL80211_PLINK_CNF_RCVD:
891 switch (event) {
892 case OPN_RJCT:
893 case CNF_RJCT:
894 case CLS_ACPT:
895 mesh_plink_close(sdata, sta, event);
896 action = WLAN_SP_MESH_PEERING_CLOSE;
897 break;
898 case OPN_ACPT:
899 changed |= mesh_plink_establish(sdata, sta);
900 action = WLAN_SP_MESH_PEERING_CONFIRM;
901 break;
902 default:
903 break;
904 }
905 break;
906 case NL80211_PLINK_ESTAB:
907 switch (event) {
908 case CLS_ACPT:
909 changed |= __mesh_plink_deactivate(sta);
910 changed |= mesh_set_ht_prot_mode(sdata);
911 changed |= mesh_set_short_slot_time(sdata);
912 mesh_plink_close(sdata, sta, event);
913 action = WLAN_SP_MESH_PEERING_CLOSE;
e596af82 914 flush = true;
c7e67811
TP		 915 break;
916 case OPN_ACPT:
917 action = WLAN_SP_MESH_PEERING_CONFIRM;
918 break;
919 default:
920 break;
921 }
922 break;
923 case NL80211_PLINK_HOLDING:
924 switch (event) {
925 case CLS_ACPT:
433f5bc1 926 del_timer(&sta->mesh->plink_timer);
c7e67811
TP		 927 mesh_plink_fsm_restart(sta);
928 break;
929 case OPN_ACPT:
930 case CNF_ACPT:
931 case OPN_RJCT:
932 case CNF_RJCT:
933 action = WLAN_SP_MESH_PEERING_CLOSE;
934 break;
935 default:
936 break;
937 }
938 break;
939 default:
940 /* should not get here, PLINK_BLOCKED is dealt with at the
941 * beginning of the function
942 */
943 break;
944 }
433f5bc1 945 spin_unlock_bh(&sta->mesh->plink_lock);
e596af82
BC		 946 if (flush)
947 mesh_path_flush_by_nexthop(sta);
c7e67811 948 if (action) {
a69bd8e6 949 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1
JB		 950 sta->mesh->llid, sta->mesh->plid,
951 sta->mesh->reason);
c7e67811
TP		 952
953 /* also send confirm in open case */
954 if (action == WLAN_SP_MESH_PEERING_OPEN) {
a69bd8e6 955 mesh_plink_frame_tx(sdata, sta,
c7e67811 956 WLAN_SP_MESH_PEERING_CONFIRM,
433f5bc1
JB		 957 sta->sta.addr, sta->mesh->llid,
958 sta->mesh->plid, 0);
c7e67811
TP		 959 }
960 }
961
962 return changed;
963}
964
c99a89ed
TP		 965/*
966 * mesh_plink_get_event - get correct MPM event
967 *
968 * @sdata: interface
969 * @sta: peer, leave NULL if processing a frame from a new suitable peer
970 * @elems: peering management IEs
971 * @ftype: frame type
972 * @llid: peer's peer link ID
973 * @plid: peer's local link ID
974 *
975 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
976 * an error.
977 */
978static enum plink_event
979mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
980 struct sta_info *sta,
981 struct ieee802_11_elems *elems,
982 enum ieee80211_self_protected_actioncode ftype,
6f101ef0 983 u16 llid, u16 plid)
c99a89ed
TP		 984{
985 enum plink_event event = PLINK_UNDEFINED;
986 u8 ie_len = elems->peering_len;
987 bool matches_local;
988
989 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
990 mesh_matches_local(sdata, elems));
991
992 /* deny open request from non-matching peer */
993 if (!matches_local && !sta) {
994 event = OPN_RJCT;
995 goto out;
996 }
997
998 if (!sta) {
999 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1000 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1001 goto out;
1002 }
1003 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1004 if (!mesh_plink_free_count(sdata)) {
1005 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1006 goto out;
1007 }
b8631c00
SS		 1008
1009 /* new matching peer */
1010 event = OPN_ACPT;
1011 goto out;
c99a89ed
TP		 1012 } else {
1013 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1014 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1015 goto out;
1016 }
433f5bc1 1017 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
c99a89ed
TP		 1018 goto out;
1019 }
1020
c99a89ed
TP		 1021 switch (ftype) {
1022 case WLAN_SP_MESH_PEERING_OPEN:
1023 if (!matches_local)
1024 event = OPN_RJCT;
1025 if (!mesh_plink_free_count(sdata) ||
433f5bc1 1026 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 1027 event = OPN_IGNR;
1028 else
1029 event = OPN_ACPT;
1030 break;
1031 case WLAN_SP_MESH_PEERING_CONFIRM:
1032 if (!matches_local)
1033 event = CNF_RJCT;
1034 if (!mesh_plink_free_count(sdata) ||
433f5bc1
JB		 1035 sta->mesh->llid != llid ||
1036 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 1037 event = CNF_IGNR;
1038 else
1039 event = CNF_ACPT;
1040 break;
1041 case WLAN_SP_MESH_PEERING_CLOSE:
433f5bc1 1042 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
c99a89ed
TP		 1043 /* Do not check for llid or plid. This does not
1044 * follow the standard but since multiple plinks
1045 * per sta are not supported, it is necessary in
1046 * order to avoid a livelock when MP A sees an
1047 * establish peer link to MP B but MP B does not
1048 * see it. This can be caused by a timeout in
1049 * B's peer link establishment or B beign
1050 * restarted.
1051 */
1052 event = CLS_ACPT;
433f5bc1 1053 else if (sta->mesh->plid != plid)
c99a89ed 1054 event = CLS_IGNR;
433f5bc1 1055 else if (ie_len == 8 && sta->mesh->llid != llid)
c99a89ed
TP		 1056 event = CLS_IGNR;
1057 else
1058 event = CLS_ACPT;
1059 break;
1060 default:
1061 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1062 break;
1063 }
1064
1065out:
1066 return event;
1067}
1068
05a23ae9
TP		 1069static void
1070mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1071 struct ieee80211_mgmt *mgmt,
1072 struct ieee802_11_elems *elems)
c3896d2c 1073{
05a23ae9 1074
c3896d2c
LCC		 1075 struct sta_info *sta;
1076 enum plink_event event;
54ef656b 1077 enum ieee80211_self_protected_actioncode ftype;
57aac7c5 1078 u32 changed = 0;
c99a89ed 1079 u8 ie_len = elems->peering_len;
6f101ef0 1080 u16 plid, llid = 0;
c3896d2c 1081
05a23ae9 1082 if (!elems->peering) {
bdcbd8e0
JB		 1083 mpl_dbg(sdata,
1084 "Mesh plink: missing necessary peer link ie\n");
c3896d2c
LCC		 1085 return;
1086 }
bf7cd94d 1087
05a23ae9 1088 if (elems->rsn_len &&
bf7cd94d 1089 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
bdcbd8e0
JB		 1090 mpl_dbg(sdata,
1091 "Mesh plink: can't establish link with secure peer\n");
5cff5e01
JC		 1092 return;
1093 }
c3896d2c 1094
8db09850 1095 ftype = mgmt->u.action.u.self_prot.action_code;
8db09850
TP		 1096 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1097 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1098 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1099 && ie_len != 8)) {
bdcbd8e0
JB		 1100 mpl_dbg(sdata,
1101 "Mesh plink: incorrect plink ie length %d %d\n",
1102 ftype, ie_len);
c3896d2c
LCC		 1103 return;
1104 }
1105
54ef656b 1106 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
05a23ae9 1107 (!elems->mesh_id || !elems->mesh_config)) {
bdcbd8e0 1108 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
c3896d2c
LCC		 1109 return;
1110 }
1111 /* Note the lines below are correct, the llid in the frame is the plid
1112 * from the point of view of this host.
1113 */
f8134fed 1114 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
54ef656b 1115 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
f8134fed
BC		 1116 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1117 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
c3896d2c 1118
296fcba3 1119 /* WARNING: Only for sta pointer, is dropped & re-acquired */
d0709a65
JB		 1120 rcu_read_lock();
1121
abe60632 1122 sta = sta_info_get(sdata, mgmt->sa);
32cb05bf 1123
55335137 1124 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
36c9bb29 1125 !rssi_threshold_check(sdata, sta)) {
bdcbd8e0 1126 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
3d4f9699 1127 mgmt->sa);
fc10302e 1128 goto unlock_rcu;
55335137
AN		 1129 }
1130
c3896d2c 1131 /* Now we will figure out the appropriate event... */
c99a89ed 1132 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
54ab1ffb
TP		 1133
1134 if (event == OPN_ACPT) {
296fcba3 1135 rcu_read_unlock();
54ab1ffb 1136 /* allocate sta entry if necessary and update info */
05a23ae9 1137 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
54ab1ffb 1138 if (!sta) {
bdcbd8e0 1139 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
fc10302e 1140 goto unlock_rcu;
54ab1ffb 1141 }
433f5bc1 1142 sta->mesh->plid = plid;
c99a89ed 1143 } else if (!sta && event == OPN_RJCT) {
a69bd8e6 1144 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
c99a89ed 1145 mgmt->sa, 0, plid,
6f101ef0 1146 WLAN_REASON_MESH_CONFIG);
c99a89ed
TP		 1147 goto unlock_rcu;
1148 } else if (!sta || event == PLINK_UNDEFINED) {
1149 /* something went wrong */
1150 goto unlock_rcu;
c3896d2c
LCC		 1151 }
1152
a69bd8e6
BC		 1153 if (event == CNF_ACPT) {
1154 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
0e0060fc 1155 if (!sta->mesh->plid)
a69bd8e6 1156 sta->mesh->plid = plid;
a69bd8e6
BC		 1157
1158 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1159 }
6c6fa496 1160
c7e67811 1161 changed |= mesh_plink_fsm(sdata, sta, event);
d0709a65 1162
fc10302e 1163unlock_rcu:
d0709a65 1164 rcu_read_unlock();
57aac7c5 1165
ecccd072 1166 if (changed)
2b5e1967 1167 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c 1168}
05a23ae9
TP		 1169
1170void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1171 struct ieee80211_mgmt *mgmt, size_t len,
1172 struct ieee80211_rx_status *rx_status)
1173{
1174 struct ieee802_11_elems elems;
1175 size_t baselen;
1176 u8 *baseaddr;
1177
1178 /* need action_code, aux */
1179 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1180 return;
1181
1182 if (sdata->u.mesh.user_mpm)
1183 /* userspace must register for these */
1184 return;
1185
1186 if (is_multicast_ether_addr(mgmt->da)) {
1187 mpl_dbg(sdata,
1188 "Mesh plink: ignore frame from multicast address\n");
1189 return;
1190 }
1191
1192 baseaddr = mgmt->u.action.u.self_prot.variable;
1193 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1194 if (mgmt->u.action.u.self_prot.action_code ==
1195 WLAN_SP_MESH_PEERING_CONFIRM) {
1196 baseaddr += 4;
1197 baselen += 4;
b3e7de87
BC		 1198
1199 if (baselen > len)
1200 return;
05a23ae9
TP		 1201 }
1202 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1203 mesh_process_plink_frame(sdata, mgmt, &elems);
1204}
Linux 6.x block layer and io_uring tree(s)