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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[deliverable/linux.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>
c3896d2c 12#include "ieee80211_i.h"
2c8dccc7 13#include "rate.h"
c3896d2c 14#include "mesh.h"
c3896d2c 15
a69bd8e6 16#define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2)
8db09850
TP		 17#define PLINK_GET_LLID(p) (p + 2)
18#define PLINK_GET_PLID(p) (p + 4)
c3896d2c 19
433f5bc1 20#define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \
cc57ac53 21 jiffies + msecs_to_jiffies(t)))
c3896d2c 22
c3896d2c
LCC		 23enum plink_event {
24 PLINK_UNDEFINED,
25 OPN_ACPT,
26 OPN_RJCT,
27 OPN_IGNR,
28 CNF_ACPT,
29 CNF_RJCT,
30 CNF_IGNR,
31 CLS_ACPT,
32 CLS_IGNR
33};
34
95e48add
TP		 35static const char * const mplstates[] = {
36 [NL80211_PLINK_LISTEN] = "LISTEN",
37 [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
38 [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
39 [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
40 [NL80211_PLINK_ESTAB] = "ESTAB",
41 [NL80211_PLINK_HOLDING] = "HOLDING",
42 [NL80211_PLINK_BLOCKED] = "BLOCKED"
43};
44
45static const char * const mplevents[] = {
46 [PLINK_UNDEFINED] = "NONE",
47 [OPN_ACPT] = "OPN_ACPT",
48 [OPN_RJCT] = "OPN_RJCT",
49 [OPN_IGNR] = "OPN_IGNR",
50 [CNF_ACPT] = "CNF_ACPT",
51 [CNF_RJCT] = "CNF_RJCT",
52 [CNF_IGNR] = "CNF_IGNR",
53 [CLS_ACPT] = "CLS_ACPT",
54 [CLS_IGNR] = "CLS_IGNR"
55};
56
36c9bb29
BC		 57/* We only need a valid sta if user configured a minimum rssi_threshold. */
58static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
59 struct sta_info *sta)
60{
61 s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
62 return rssi_threshold == 0 ||
e5a9f8d0 63 (sta &&
0be6ed13 64 (s8)-ewma_signal_read(&sta->rx_stats_avg.signal) >
e5a9f8d0 65 rssi_threshold);
36c9bb29
BC		 66}
67
c3896d2c
LCC		 68/**
69 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
70 *
23c7a29c 71 * @sta: mesh peer link to restart
c3896d2c 72 *
433f5bc1 73 * Locking: this function must be called holding sta->mesh->plink_lock
c3896d2c
LCC		 74 */
75static inline void mesh_plink_fsm_restart(struct sta_info *sta)
76{
433f5bc1
JB		 77 lockdep_assert_held(&sta->mesh->plink_lock);
78 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
79 sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0;
80 sta->mesh->plink_retries = 0;
c3896d2c
LCC		 81}
82
3b144658
TP		 83/*
84 * mesh_set_short_slot_time - enable / disable ERP short slot time.
85 *
86 * The standard indirectly mandates mesh STAs to turn off short slot time by
87 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
88 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
89 * MBSS support ERP rates.
90 *
91 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
92 */
93static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
94{
95 struct ieee80211_local *local = sdata->local;
57fbcce3 96 enum nl80211_band band = ieee80211_get_sdata_band(sdata);
3b144658
TP		 97 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
98 struct sta_info *sta;
99 u32 erp_rates = 0, changed = 0;
100 int i;
101 bool short_slot = false;
102
57fbcce3 103 if (band == NL80211_BAND_5GHZ) {
3b144658
TP		 104 /* (IEEE 802.11-2012 19.4.5) */
105 short_slot = true;
106 goto out;
57fbcce3 107 } else if (band != NL80211_BAND_2GHZ)
3b144658
TP		 108 goto out;
109
110 for (i = 0; i < sband->n_bitrates; i++)
111 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
112 erp_rates |= BIT(i);
113
114 if (!erp_rates)
115 goto out;
116
117 rcu_read_lock();
118 list_for_each_entry_rcu(sta, &local->sta_list, list) {
119 if (sdata != sta->sdata ||
433f5bc1 120 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
3b144658
TP		 121 continue;
122
123 short_slot = false;
124 if (erp_rates & sta->sta.supp_rates[band])
125 short_slot = true;
126 else
127 break;
128 }
129 rcu_read_unlock();
130
131out:
132 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
133 sdata->vif.bss_conf.use_short_slot = short_slot;
134 changed = BSS_CHANGED_ERP_SLOT;
135 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
136 sdata->vif.addr, short_slot);
137 }
138 return changed;
139}
140
2c53040f 141/**
cbf9322e 142 * mesh_set_ht_prot_mode - set correct HT protection mode
57aac7c5 143 *
cbf9322e
AN		 144 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
145 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
146 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
147 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
148 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
149 * HT20 peer is present. Otherwise no-protection mode is selected.
57aac7c5
AN		 150 */
151static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
152{
153 struct ieee80211_local *local = sdata->local;
154 struct sta_info *sta;
57aac7c5
AN		 155 u16 ht_opmode;
156 bool non_ht_sta = false, ht20_sta = false;
157
0418a445
SW		 158 switch (sdata->vif.bss_conf.chandef.width) {
159 case NL80211_CHAN_WIDTH_20_NOHT:
160 case NL80211_CHAN_WIDTH_5:
161 case NL80211_CHAN_WIDTH_10:
57aac7c5 162 return 0;
0418a445
SW		 163 default:
164 break;
165 }
57aac7c5
AN		 166
167 rcu_read_lock();
168 list_for_each_entry_rcu(sta, &local->sta_list, list) {
cbf9322e 169 if (sdata != sta->sdata ||
433f5bc1 170 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
cbf9322e
AN		 171 continue;
172
52ac8c48
TP		 173 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
174 continue;
175
176 if (!sta->sta.ht_cap.ht_supported) {
177 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
178 sta->sta.addr);
cbf9322e 179 non_ht_sta = true;
cbf9322e 180 break;
57aac7c5 181 }
52ac8c48
TP		 182
183 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
184 ht20_sta = true;
57aac7c5 185 }
57aac7c5
AN		 186 rcu_read_unlock();
187
188 if (non_ht_sta)
189 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
466f310d 190 else if (ht20_sta &&
4bf88530 191 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
57aac7c5
AN		 192 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
193 else
194 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
195
52ac8c48
TP		 196 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
197 return 0;
57aac7c5 198
52ac8c48
TP		 199 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
200 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
201 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
202 return BSS_CHANGED_HT;
57aac7c5
AN		 203}
204
f698d856 205static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
a69bd8e6 206 struct sta_info *sta,
bf7cd94d 207 enum ieee80211_self_protected_actioncode action,
6f101ef0 208 u8 *da, u16 llid, u16 plid, u16 reason)
bf7cd94d 209{
f698d856 210 struct ieee80211_local *local = sdata->local;
3b69a9c5 211 struct sk_buff *skb;
e7570dfb 212 struct ieee80211_tx_info *info;
c3896d2c
LCC		 213 struct ieee80211_mgmt *mgmt;
214 bool include_plid = false;
8db09850 215 u16 peering_proto = 0;
3b69a9c5
TP		 216 u8 *pos, ie_len = 4;
217 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
218 sizeof(mgmt->u.action.u.self_prot);
f609a43d 219 int err = -ENOMEM;
3b69a9c5 220
65e8b0cc 221 skb = dev_alloc_skb(local->tx_headroom +
3b69a9c5
TP		 222 hdr_len +
223 2 + /* capability info */
224 2 + /* AID */
225 2 + 8 + /* supported rates */
226 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
227 2 + sdata->u.mesh.mesh_id_len +
228 2 + sizeof(struct ieee80211_meshconf_ie) +
176f3608 229 2 + sizeof(struct ieee80211_ht_cap) +
074d46d1 230 2 + sizeof(struct ieee80211_ht_operation) +
c85fb53c
BC		 231 2 + sizeof(struct ieee80211_vht_cap) +
232 2 + sizeof(struct ieee80211_vht_operation) +
3b69a9c5
TP		 233 2 + 8 + /* peering IE */
234 sdata->u.mesh.ie_len);
c3896d2c 235 if (!skb)
87d84c45 236 return err;
e7570dfb 237 info = IEEE80211_SKB_CB(skb);
65e8b0cc 238 skb_reserve(skb, local->tx_headroom);
3b69a9c5
TP		 239 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
240 memset(mgmt, 0, hdr_len);
e7827a70
HH		 241 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
242 IEEE80211_STYPE_ACTION);
c3896d2c 243 memcpy(mgmt->da, da, ETH_ALEN);
47846c9b 244 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
915b5c50 245 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
8db09850
TP		 246 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
247 mgmt->u.action.u.self_prot.action_code = action;
c3896d2c 248
8db09850 249 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
57fbcce3 250 enum nl80211_band band = ieee80211_get_sdata_band(sdata);
55de908a 251
8db09850
TP		 252 /* capability info */
253 pos = skb_put(skb, 2);
254 memset(pos, 0, 2);
54ef656b 255 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
8db09850
TP		 256 /* AID */
257 pos = skb_put(skb, 2);
a69bd8e6 258 put_unaligned_le16(sta->sta.aid, pos);
c3896d2c 259 }
55de908a
JB		 260 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
261 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
bf7cd94d
JB		 262 mesh_add_rsn_ie(sdata, skb) ||
263 mesh_add_meshid_ie(sdata, skb) ||
264 mesh_add_meshconf_ie(sdata, skb))
f609a43d 265 goto free;
8db09850 266 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
e7570dfb 267 info->flags |= IEEE80211_TX_CTL_NO_ACK;
bf7cd94d 268 if (mesh_add_meshid_ie(sdata, skb))
f609a43d 269 goto free;
c3896d2c
LCC		 270 }
271
8db09850 272 /* Add Mesh Peering Management element */
c3896d2c 273 switch (action) {
54ef656b 274 case WLAN_SP_MESH_PEERING_OPEN:
c3896d2c 275 break;
54ef656b 276 case WLAN_SP_MESH_PEERING_CONFIRM:
8db09850 277 ie_len += 2;
c3896d2c
LCC		 278 include_plid = true;
279 break;
54ef656b 280 case WLAN_SP_MESH_PEERING_CLOSE:
8db09850
TP		 281 if (plid) {
282 ie_len += 2;
c3896d2c
LCC		 283 include_plid = true;
284 }
8db09850 285 ie_len += 2; /* reason code */
c3896d2c 286 break;
8db09850 287 default:
f609a43d
TP		 288 err = -EINVAL;
289 goto free;
c3896d2c
LCC		 290 }
291
8db09850 292 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
f609a43d 293 goto free;
8db09850 294
c3896d2c 295 pos = skb_put(skb, 2 + ie_len);
8db09850 296 *pos++ = WLAN_EID_PEER_MGMT;
c3896d2c 297 *pos++ = ie_len;
8db09850
TP		 298 memcpy(pos, &peering_proto, 2);
299 pos += 2;
6f101ef0 300 put_unaligned_le16(llid, pos);
8db09850 301 pos += 2;
c3896d2c 302 if (include_plid) {
6f101ef0 303 put_unaligned_le16(plid, pos);
8db09850 304 pos += 2;
c3896d2c 305 }
54ef656b 306 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
6f101ef0 307 put_unaligned_le16(reason, pos);
8db09850 308 pos += 2;
c3896d2c 309 }
176f3608
TP		 310
311 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
bf7cd94d 312 if (mesh_add_ht_cap_ie(sdata, skb) ||
c85fb53c
BC		 313 mesh_add_ht_oper_ie(sdata, skb) ||
314 mesh_add_vht_cap_ie(sdata, skb) ||
315 mesh_add_vht_oper_ie(sdata, skb))
f609a43d 316 goto free;
176f3608
TP		 317 }
318
bf7cd94d 319 if (mesh_add_vendor_ies(sdata, skb))
f609a43d 320 goto free;
c3896d2c 321
62ae67be 322 ieee80211_tx_skb(sdata, skb);
c3896d2c 323 return 0;
f609a43d
TP		 324free:
325 kfree_skb(skb);
326 return err;
c3896d2c
LCC		 327}
328
fa87a656
BC		 329/**
330 * __mesh_plink_deactivate - deactivate mesh peer link
331 *
332 * @sta: mesh peer link to deactivate
333 *
e596af82
BC		 334 * Mesh paths with this peer as next hop should be flushed
335 * by the caller outside of plink_lock.
336 *
fa87a656
BC		 337 * Returns beacon changed flag if the beacon content changed.
338 *
339 * Locking: the caller must hold sta->mesh->plink_lock
340 */
341static u32 __mesh_plink_deactivate(struct sta_info *sta)
342{
343 struct ieee80211_sub_if_data *sdata = sta->sdata;
344 u32 changed = 0;
345
346 lockdep_assert_held(&sta->mesh->plink_lock);
347
348 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
349 changed = mesh_plink_dec_estab_count(sdata);
350 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
fa87a656
BC		 351
352 ieee80211_mps_sta_status_update(sta);
353 changed |= ieee80211_mps_set_sta_local_pm(sta,
354 NL80211_MESH_POWER_UNKNOWN);
355
356 return changed;
357}
358
359/**
360 * mesh_plink_deactivate - deactivate mesh peer link
361 *
362 * @sta: mesh peer link to deactivate
363 *
364 * All mesh paths with this peer as next hop will be flushed
365 */
366u32 mesh_plink_deactivate(struct sta_info *sta)
367{
368 struct ieee80211_sub_if_data *sdata = sta->sdata;
369 u32 changed;
370
371 spin_lock_bh(&sta->mesh->plink_lock);
372 changed = __mesh_plink_deactivate(sta);
373 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
a69bd8e6 374 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
fa87a656
BC		 375 sta->sta.addr, sta->mesh->llid, sta->mesh->plid,
376 sta->mesh->reason);
377 spin_unlock_bh(&sta->mesh->plink_lock);
e596af82 378 mesh_path_flush_by_nexthop(sta);
fa87a656
BC		 379
380 return changed;
381}
382
296fcba3
TP		 383static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
384 struct sta_info *sta,
385 struct ieee802_11_elems *elems, bool insert)
c3896d2c 386{
f698d856 387 struct ieee80211_local *local = sdata->local;
57fbcce3 388 enum nl80211_band band = ieee80211_get_sdata_band(sdata);
54ab1ffb 389 struct ieee80211_supported_band *sband;
f68d776a 390 u32 rates, basic_rates = 0, changed = 0;
abcff6ef 391 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
c3896d2c 392
f743ff49 393 sband = local->hw.wiphy->bands[band];
2103dec1 394 rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates);
d0709a65 395
433f5bc1 396 spin_lock_bh(&sta->mesh->plink_lock);
e5a9f8d0 397 sta->rx_stats.last_rx = jiffies;
296fcba3
TP		 398
399 /* rates and capabilities don't change during peering */
433f5bc1
JB		 400 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
401 sta->mesh->processed_beacon)
296fcba3 402 goto out;
433f5bc1 403 sta->mesh->processed_beacon = true;
bae35d92 404
f68d776a
TP		 405 if (sta->sta.supp_rates[band] != rates)
406 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
f743ff49 407 sta->sta.supp_rates[band] = rates;
54ab1ffb 408
52ac8c48
TP		 409 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
410 elems->ht_cap_elem, sta))
411 changed |= IEEE80211_RC_BW_CHANGED;
4bf88530 412
c85fb53c
BC		 413 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
414 elems->vht_cap_elem, sta);
415
abcff6ef
JD		 416 if (bw != sta->sta.bandwidth)
417 changed |= IEEE80211_RC_BW_CHANGED;
418
52ac8c48
TP		 419 /* HT peer is operating 20MHz-only */
420 if (elems->ht_operation &&
421 !(elems->ht_operation->ht_param &
422 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
423 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
f68d776a 424 changed |= IEEE80211_RC_BW_CHANGED;
52ac8c48 425 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
57aac7c5 426 }
c7d25828 427
59cf1d65
HS		 428 if (insert)
429 rate_control_rate_init(sta);
f68d776a
TP		 430 else
431 rate_control_rate_update(local, sband, sta, changed);
296fcba3 432out:
433f5bc1 433 spin_unlock_bh(&sta->mesh->plink_lock);
296fcba3
TP		 434}
435
0e0060fc
BC		 436static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
437{
438 struct sta_info *sta;
439 unsigned long *aid_map;
440 int aid;
441
442 aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
443 sizeof(*aid_map), GFP_KERNEL);
444 if (!aid_map)
445 return -ENOMEM;
446
447 /* reserve aid 0 for mcast indication */
448 __set_bit(0, aid_map);
449
450 rcu_read_lock();
451 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
452 __set_bit(sta->sta.aid, aid_map);
453 rcu_read_unlock();
454
455 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
456 kfree(aid_map);
457
458 if (aid > IEEE80211_MAX_AID)
459 return -ENOBUFS;
460
461 return aid;
462}
463
296fcba3
TP		 464static struct sta_info *
465__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
466{
467 struct sta_info *sta;
0e0060fc 468 int aid;
54ab1ffb 469
296fcba3 470 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
e87278e7
TP		 471 return NULL;
472
0e0060fc
BC		 473 aid = mesh_allocate_aid(sdata);
474 if (aid < 0)
475 return NULL;
476
296fcba3
TP		 477 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
478 if (!sta)
479 return NULL;
480
433f5bc1 481 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
a74a8c84 482 sta->sta.wme = true;
0e0060fc 483 sta->sta.aid = aid;
296fcba3
TP		 484
485 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
486 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
487 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
488
296fcba3
TP		 489 return sta;
490}
491
492static struct sta_info *
493mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
494 struct ieee802_11_elems *elems)
495{
496 struct sta_info *sta = NULL;
497
a6dad6a2
TP		 498 /* Userspace handles station allocation */
499 if (sdata->u.mesh.user_mpm ||
500 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
296fcba3
TP		 501 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
502 elems->ie_start,
503 elems->total_len,
504 GFP_KERNEL);
505 else
506 sta = __mesh_sta_info_alloc(sdata, addr);
507
54ab1ffb
TP		 508 return sta;
509}
510
296fcba3
TP		 511/*
512 * mesh_sta_info_get - return mesh sta info entry for @addr.
513 *
514 * @sdata: local meshif
515 * @addr: peer's address
516 * @elems: IEs from beacon or mesh peering frame.
517 *
518 * Return existing or newly allocated sta_info under RCU read lock.
519 * (re)initialize with given IEs.
520 */
521static struct sta_info *
522mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
523 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
524{
525 struct sta_info *sta = NULL;
526
527 rcu_read_lock();
528 sta = sta_info_get(sdata, addr);
529 if (sta) {
530 mesh_sta_info_init(sdata, sta, elems, false);
531 } else {
532 rcu_read_unlock();
533 /* can't run atomic */
534 sta = mesh_sta_info_alloc(sdata, addr, elems);
535 if (!sta) {
536 rcu_read_lock();
537 return NULL;
538 }
539
3b4797bc
TP		 540 mesh_sta_info_init(sdata, sta, elems, true);
541
296fcba3
TP		 542 if (sta_info_insert_rcu(sta))
543 return NULL;
544 }
545
546 return sta;
547}
548
549/*
550 * mesh_neighbour_update - update or initialize new mesh neighbor.
551 *
552 * @sdata: local meshif
553 * @addr: peer's address
554 * @elems: IEs from beacon or mesh peering frame
555 *
556 * Initiates peering if appropriate.
557 */
f743ff49
TP		 558void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
559 u8 *hw_addr,
54ab1ffb
TP		 560 struct ieee802_11_elems *elems)
561{
562 struct sta_info *sta;
39886b61 563 u32 changed = 0;
54ab1ffb 564
296fcba3 565 sta = mesh_sta_info_get(sdata, hw_addr, elems);
54ab1ffb
TP		 566 if (!sta)
567 goto out;
568
1570ca59 569 if (mesh_peer_accepts_plinks(elems) &&
433f5bc1 570 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
54ab1ffb
TP		 571 sdata->u.mesh.accepting_plinks &&
572 sdata->u.mesh.mshcfg.auto_open_plinks &&
36c9bb29 573 rssi_threshold_check(sdata, sta))
39886b61 574 changed = mesh_plink_open(sta);
c3896d2c 575
3f52b7e3 576 ieee80211_mps_frame_release(sta, elems);
54ab1ffb 577out:
d0709a65 578 rcu_read_unlock();
2b5e1967 579 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c
LCC		 580}
581
582static void mesh_plink_timer(unsigned long data)
583{
584 struct sta_info *sta;
6f101ef0 585 u16 reason = 0;
c3896d2c 586 struct ieee80211_sub_if_data *sdata;
453e66f2 587 struct mesh_config *mshcfg;
4efec451 588 enum ieee80211_self_protected_actioncode action = 0;
c3896d2c 589
d0709a65
JB		 590 /*
591 * This STA is valid because sta_info_destroy() will
592 * del_timer_sync() this timer after having made sure
593 * it cannot be readded (by deleting the plink.)
594 */
c3896d2c
LCC		 595 sta = (struct sta_info *) data;
596
690205f1 597 if (sta->sdata->local->quiescing)
5bb644a0 598 return;
5bb644a0 599
433f5bc1 600 spin_lock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 601
602 /* If a timer fires just before a state transition on another CPU,
603 * we may have already extended the timeout and changed state by the
604 * time we've acquired the lock and arrived here. In that case,
605 * skip this timer and wait for the new one.
606 */
433f5bc1 607 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
2b470c39
BC		 608 mpl_dbg(sta->sdata,
609 "Ignoring timer for %pM in state %s (timer adjusted)",
433f5bc1
JB		 610 sta->sta.addr, mplstates[sta->mesh->plink_state]);
611 spin_unlock_bh(&sta->mesh->plink_lock);
c3896d2c
LCC		 612 return;
613 }
2b470c39
BC		 614
615 /* del_timer() and handler may race when entering these states */
433f5bc1
JB		 616 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
617 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
2b470c39
BC		 618 mpl_dbg(sta->sdata,
619 "Ignoring timer for %pM in state %s (timer deleted)",
433f5bc1
JB		 620 sta->sta.addr, mplstates[sta->mesh->plink_state]);
621 spin_unlock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 622 return;
623 }
624
bdcbd8e0 625 mpl_dbg(sta->sdata,
3088f7d2 626 "Mesh plink timer for %pM fired on state %s\n",
433f5bc1 627 sta->sta.addr, mplstates[sta->mesh->plink_state]);
d0709a65 628 sdata = sta->sdata;
453e66f2 629 mshcfg = &sdata->u.mesh.mshcfg;
c3896d2c 630
433f5bc1 631 switch (sta->mesh->plink_state) {
57cf8043
JC		 632 case NL80211_PLINK_OPN_RCVD:
633 case NL80211_PLINK_OPN_SNT:
c3896d2c 634 /* retry timer */
433f5bc1 635 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
c3896d2c 636 u32 rand;
bdcbd8e0
JB		 637 mpl_dbg(sta->sdata,
638 "Mesh plink for %pM (retry, timeout): %d %d\n",
433f5bc1
JB		 639 sta->sta.addr, sta->mesh->plink_retries,
640 sta->mesh->plink_timeout);
c3896d2c 641 get_random_bytes(&rand, sizeof(u32));
433f5bc1
JB		 642 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
643 rand % sta->mesh->plink_timeout;
644 ++sta->mesh->plink_retries;
645 mod_plink_timer(sta, sta->mesh->plink_timeout);
4efec451 646 action = WLAN_SP_MESH_PEERING_OPEN;
c3896d2c
LCC		 647 break;
648 }
6f101ef0 649 reason = WLAN_REASON_MESH_MAX_RETRIES;
c3896d2c 650 /* fall through on else */
57cf8043 651 case NL80211_PLINK_CNF_RCVD:
c3896d2c
LCC		 652 /* confirm timer */
653 if (!reason)
6f101ef0 654 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
433f5bc1 655 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
453e66f2 656 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
4efec451 657 action = WLAN_SP_MESH_PEERING_CLOSE;
c3896d2c 658 break;
57cf8043 659 case NL80211_PLINK_HOLDING:
c3896d2c 660 /* holding timer */
433f5bc1 661 del_timer(&sta->mesh->plink_timer);
c3896d2c 662 mesh_plink_fsm_restart(sta);
c3896d2c
LCC		 663 break;
664 default:
c3896d2c
LCC		 665 break;
666 }
433f5bc1 667 spin_unlock_bh(&sta->mesh->plink_lock);
4efec451 668 if (action)
a69bd8e6 669 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1 670 sta->mesh->llid, sta->mesh->plid, reason);
c3896d2c
LCC		 671}
672
0df2f6c1 673static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
c3896d2c 674{
433f5bc1
JB		 675 sta->mesh->plink_timer.expires = jiffies + msecs_to_jiffies(timeout);
676 sta->mesh->plink_timer.data = (unsigned long) sta;
677 sta->mesh->plink_timer.function = mesh_plink_timer;
678 sta->mesh->plink_timeout = timeout;
679 add_timer(&sta->mesh->plink_timer);
c3896d2c
LCC		 680}
681
204d1304 682static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
6f101ef0 683 u16 llid)
204d1304
TP		 684{
685 struct ieee80211_local *local = sdata->local;
686 bool in_use = false;
687 struct sta_info *sta;
688
689 rcu_read_lock();
690 list_for_each_entry_rcu(sta, &local->sta_list, list) {
520c75dc
MS		 691 if (sdata != sta->sdata)
692 continue;
693
433f5bc1 694 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
204d1304
TP		 695 in_use = true;
696 break;
697 }
698 }
699 rcu_read_unlock();
700
701 return in_use;
702}
703
6f101ef0 704static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
204d1304
TP		 705{
706 u16 llid;
707
708 do {
709 get_random_bytes(&llid, sizeof(llid));
6f101ef0 710 } while (llid_in_use(sdata, llid));
204d1304 711
6f101ef0 712 return llid;
204d1304
TP		 713}
714
39886b61 715u32 mesh_plink_open(struct sta_info *sta)
c3896d2c 716{
d0709a65 717 struct ieee80211_sub_if_data *sdata = sta->sdata;
39886b61 718 u32 changed;
c3896d2c 719
c2c98fde 720 if (!test_sta_flag(sta, WLAN_STA_AUTH))
39886b61 721 return 0;
53e80511 722
433f5bc1
JB		 723 spin_lock_bh(&sta->mesh->plink_lock);
724 sta->mesh->llid = mesh_get_new_llid(sdata);
725 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
726 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
727 spin_unlock_bh(&sta->mesh->plink_lock);
39886b61 728 return 0;
c3896d2c 729 }
433f5bc1 730 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
453e66f2 731 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
433f5bc1 732 spin_unlock_bh(&sta->mesh->plink_lock);
bdcbd8e0
JB		 733 mpl_dbg(sdata,
734 "Mesh plink: starting establishment with %pM\n",
0c68ae26 735 sta->sta.addr);
c3896d2c 736
3f52b7e3 737 /* set the non-peer mode to active during peering */
39886b61 738 changed = ieee80211_mps_local_status_update(sdata);
3f52b7e3 739
a69bd8e6 740 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
433f5bc1 741 sta->sta.addr, sta->mesh->llid, 0, 0);
39886b61 742 return changed;
c3896d2c
LCC		 743}
744
39886b61 745u32 mesh_plink_block(struct sta_info *sta)
c3896d2c 746{
df323818 747 u32 changed;
c9370197 748
433f5bc1 749 spin_lock_bh(&sta->mesh->plink_lock);
df323818 750 changed = __mesh_plink_deactivate(sta);
433f5bc1
JB		 751 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
752 spin_unlock_bh(&sta->mesh->plink_lock);
e596af82 753 mesh_path_flush_by_nexthop(sta);
c9370197 754
39886b61 755 return changed;
c3896d2c
LCC		 756}
757
e76d67f0
BC		 758static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
759 struct sta_info *sta,
760 enum plink_event event)
761{
762 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
6f101ef0
CYY		 763 u16 reason = (event == CLS_ACPT) ?
764 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
e76d67f0 765
433f5bc1
JB		 766 sta->mesh->reason = reason;
767 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
272a9e26 768 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
e76d67f0
BC		 769}
770
771static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
772 struct sta_info *sta)
773{
774 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
775 u32 changed = 0;
776
433f5bc1
JB		 777 del_timer(&sta->mesh->plink_timer);
778 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
e76d67f0
BC		 779 changed |= mesh_plink_inc_estab_count(sdata);
780 changed |= mesh_set_ht_prot_mode(sdata);
781 changed |= mesh_set_short_slot_time(sdata);
782 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
783 ieee80211_mps_sta_status_update(sta);
784 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
785 return changed;
786}
787
c7e67811
TP		 788/**
789 * mesh_plink_fsm - step @sta MPM based on @event
790 *
791 * @sdata: interface
792 * @sta: mesh neighbor
793 * @event: peering event
794 *
795 * Return: changed MBSS flags
796 */
797static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
798 struct sta_info *sta, enum plink_event event)
799{
800 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
801 enum ieee80211_self_protected_actioncode action = 0;
802 u32 changed = 0;
e596af82 803 bool flush = false;
c7e67811
TP		 804
805 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
433f5bc1 806 mplstates[sta->mesh->plink_state], mplevents[event]);
c7e67811 807
433f5bc1
JB		 808 spin_lock_bh(&sta->mesh->plink_lock);
809 switch (sta->mesh->plink_state) {
c7e67811
TP		 810 case NL80211_PLINK_LISTEN:
811 switch (event) {
812 case CLS_ACPT:
813 mesh_plink_fsm_restart(sta);
814 break;
815 case OPN_ACPT:
433f5bc1
JB		 816 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
817 sta->mesh->llid = mesh_get_new_llid(sdata);
c7e67811
TP		 818 mesh_plink_timer_set(sta,
819 mshcfg->dot11MeshRetryTimeout);
820
821 /* set the non-peer mode to active during peering */
822 changed |= ieee80211_mps_local_status_update(sdata);
823 action = WLAN_SP_MESH_PEERING_OPEN;
824 break;
825 default:
826 break;
827 }
828 break;
829 case NL80211_PLINK_OPN_SNT:
830 switch (event) {
831 case OPN_RJCT:
832 case CNF_RJCT:
833 case CLS_ACPT:
834 mesh_plink_close(sdata, sta, event);
835 action = WLAN_SP_MESH_PEERING_CLOSE;
836 break;
837 case OPN_ACPT:
838 /* retry timer is left untouched */
433f5bc1 839 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
c7e67811
TP		 840 action = WLAN_SP_MESH_PEERING_CONFIRM;
841 break;
842 case CNF_ACPT:
433f5bc1 843 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
2b470c39 844 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
c7e67811
TP		 845 break;
846 default:
847 break;
848 }
849 break;
850 case NL80211_PLINK_OPN_RCVD:
851 switch (event) {
852 case OPN_RJCT:
853 case CNF_RJCT:
854 case CLS_ACPT:
855 mesh_plink_close(sdata, sta, event);
856 action = WLAN_SP_MESH_PEERING_CLOSE;
857 break;
858 case OPN_ACPT:
859 action = WLAN_SP_MESH_PEERING_CONFIRM;
860 break;
861 case CNF_ACPT:
862 changed |= mesh_plink_establish(sdata, sta);
863 break;
864 default:
865 break;
866 }
867 break;
868 case NL80211_PLINK_CNF_RCVD:
869 switch (event) {
870 case OPN_RJCT:
871 case CNF_RJCT:
872 case CLS_ACPT:
873 mesh_plink_close(sdata, sta, event);
874 action = WLAN_SP_MESH_PEERING_CLOSE;
875 break;
876 case OPN_ACPT:
877 changed |= mesh_plink_establish(sdata, sta);
878 action = WLAN_SP_MESH_PEERING_CONFIRM;
879 break;
880 default:
881 break;
882 }
883 break;
884 case NL80211_PLINK_ESTAB:
885 switch (event) {
886 case CLS_ACPT:
887 changed |= __mesh_plink_deactivate(sta);
888 changed |= mesh_set_ht_prot_mode(sdata);
889 changed |= mesh_set_short_slot_time(sdata);
890 mesh_plink_close(sdata, sta, event);
891 action = WLAN_SP_MESH_PEERING_CLOSE;
e596af82 892 flush = true;
c7e67811
TP		 893 break;
894 case OPN_ACPT:
895 action = WLAN_SP_MESH_PEERING_CONFIRM;
896 break;
897 default:
898 break;
899 }
900 break;
901 case NL80211_PLINK_HOLDING:
902 switch (event) {
903 case CLS_ACPT:
433f5bc1 904 del_timer(&sta->mesh->plink_timer);
c7e67811
TP		 905 mesh_plink_fsm_restart(sta);
906 break;
907 case OPN_ACPT:
908 case CNF_ACPT:
909 case OPN_RJCT:
910 case CNF_RJCT:
911 action = WLAN_SP_MESH_PEERING_CLOSE;
912 break;
913 default:
914 break;
915 }
916 break;
917 default:
918 /* should not get here, PLINK_BLOCKED is dealt with at the
919 * beginning of the function
920 */
921 break;
922 }
433f5bc1 923 spin_unlock_bh(&sta->mesh->plink_lock);
e596af82
BC		 924 if (flush)
925 mesh_path_flush_by_nexthop(sta);
c7e67811 926 if (action) {
a69bd8e6 927 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1
JB		 928 sta->mesh->llid, sta->mesh->plid,
929 sta->mesh->reason);
c7e67811
TP		 930
931 /* also send confirm in open case */
932 if (action == WLAN_SP_MESH_PEERING_OPEN) {
a69bd8e6 933 mesh_plink_frame_tx(sdata, sta,
c7e67811 934 WLAN_SP_MESH_PEERING_CONFIRM,
433f5bc1
JB		 935 sta->sta.addr, sta->mesh->llid,
936 sta->mesh->plid, 0);
c7e67811
TP		 937 }
938 }
939
940 return changed;
941}
942
c99a89ed
TP		 943/*
944 * mesh_plink_get_event - get correct MPM event
945 *
946 * @sdata: interface
947 * @sta: peer, leave NULL if processing a frame from a new suitable peer
948 * @elems: peering management IEs
949 * @ftype: frame type
950 * @llid: peer's peer link ID
951 * @plid: peer's local link ID
952 *
953 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
954 * an error.
955 */
956static enum plink_event
957mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
958 struct sta_info *sta,
959 struct ieee802_11_elems *elems,
960 enum ieee80211_self_protected_actioncode ftype,
6f101ef0 961 u16 llid, u16 plid)
c99a89ed
TP		 962{
963 enum plink_event event = PLINK_UNDEFINED;
964 u8 ie_len = elems->peering_len;
965 bool matches_local;
966
967 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
968 mesh_matches_local(sdata, elems));
969
970 /* deny open request from non-matching peer */
971 if (!matches_local && !sta) {
972 event = OPN_RJCT;
973 goto out;
974 }
975
976 if (!sta) {
977 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
978 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
979 goto out;
980 }
981 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
982 if (!mesh_plink_free_count(sdata)) {
983 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
984 goto out;
985 }
b8631c00
SS		 986
987 /* new matching peer */
988 event = OPN_ACPT;
989 goto out;
c99a89ed
TP		 990 } else {
991 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
992 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
993 goto out;
994 }
433f5bc1 995 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
c99a89ed
TP		 996 goto out;
997 }
998
c99a89ed
TP		 999 switch (ftype) {
1000 case WLAN_SP_MESH_PEERING_OPEN:
1001 if (!matches_local)
1002 event = OPN_RJCT;
1003 if (!mesh_plink_free_count(sdata) ||
433f5bc1 1004 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 1005 event = OPN_IGNR;
1006 else
1007 event = OPN_ACPT;
1008 break;
1009 case WLAN_SP_MESH_PEERING_CONFIRM:
1010 if (!matches_local)
1011 event = CNF_RJCT;
1012 if (!mesh_plink_free_count(sdata) ||
433f5bc1
JB		 1013 sta->mesh->llid != llid ||
1014 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 1015 event = CNF_IGNR;
1016 else
1017 event = CNF_ACPT;
1018 break;
1019 case WLAN_SP_MESH_PEERING_CLOSE:
433f5bc1 1020 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
c99a89ed
TP		 1021 /* Do not check for llid or plid. This does not
1022 * follow the standard but since multiple plinks
1023 * per sta are not supported, it is necessary in
1024 * order to avoid a livelock when MP A sees an
1025 * establish peer link to MP B but MP B does not
1026 * see it. This can be caused by a timeout in
1027 * B's peer link establishment or B beign
1028 * restarted.
1029 */
1030 event = CLS_ACPT;
433f5bc1 1031 else if (sta->mesh->plid != plid)
c99a89ed 1032 event = CLS_IGNR;
433f5bc1 1033 else if (ie_len == 8 && sta->mesh->llid != llid)
c99a89ed
TP		 1034 event = CLS_IGNR;
1035 else
1036 event = CLS_ACPT;
1037 break;
1038 default:
1039 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1040 break;
1041 }
1042
1043out:
1044 return event;
1045}
1046
05a23ae9
TP		 1047static void
1048mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1049 struct ieee80211_mgmt *mgmt,
1050 struct ieee802_11_elems *elems)
c3896d2c 1051{
05a23ae9 1052
c3896d2c
LCC		 1053 struct sta_info *sta;
1054 enum plink_event event;
54ef656b 1055 enum ieee80211_self_protected_actioncode ftype;
57aac7c5 1056 u32 changed = 0;
c99a89ed 1057 u8 ie_len = elems->peering_len;
6f101ef0 1058 u16 plid, llid = 0;
c3896d2c 1059
05a23ae9 1060 if (!elems->peering) {
bdcbd8e0
JB		 1061 mpl_dbg(sdata,
1062 "Mesh plink: missing necessary peer link ie\n");
c3896d2c
LCC		 1063 return;
1064 }
bf7cd94d 1065
05a23ae9 1066 if (elems->rsn_len &&
bf7cd94d 1067 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
bdcbd8e0
JB		 1068 mpl_dbg(sdata,
1069 "Mesh plink: can't establish link with secure peer\n");
5cff5e01
JC		 1070 return;
1071 }
c3896d2c 1072
8db09850 1073 ftype = mgmt->u.action.u.self_prot.action_code;
8db09850
TP		 1074 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1075 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1076 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1077 && ie_len != 8)) {
bdcbd8e0
JB		 1078 mpl_dbg(sdata,
1079 "Mesh plink: incorrect plink ie length %d %d\n",
1080 ftype, ie_len);
c3896d2c
LCC		 1081 return;
1082 }
1083
54ef656b 1084 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
05a23ae9 1085 (!elems->mesh_id || !elems->mesh_config)) {
bdcbd8e0 1086 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
c3896d2c
LCC		 1087 return;
1088 }
1089 /* Note the lines below are correct, the llid in the frame is the plid
1090 * from the point of view of this host.
1091 */
f8134fed 1092 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
54ef656b 1093 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
f8134fed
BC		 1094 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1095 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
c3896d2c 1096
296fcba3 1097 /* WARNING: Only for sta pointer, is dropped & re-acquired */
d0709a65
JB		 1098 rcu_read_lock();
1099
abe60632 1100 sta = sta_info_get(sdata, mgmt->sa);
32cb05bf 1101
55335137 1102 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
36c9bb29 1103 !rssi_threshold_check(sdata, sta)) {
bdcbd8e0 1104 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
3d4f9699 1105 mgmt->sa);
fc10302e 1106 goto unlock_rcu;
55335137
AN		 1107 }
1108
c3896d2c 1109 /* Now we will figure out the appropriate event... */
c99a89ed 1110 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
54ab1ffb
TP		 1111
1112 if (event == OPN_ACPT) {
296fcba3 1113 rcu_read_unlock();
54ab1ffb 1114 /* allocate sta entry if necessary and update info */
05a23ae9 1115 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
54ab1ffb 1116 if (!sta) {
bdcbd8e0 1117 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
fc10302e 1118 goto unlock_rcu;
54ab1ffb 1119 }
433f5bc1 1120 sta->mesh->plid = plid;
c99a89ed 1121 } else if (!sta && event == OPN_RJCT) {
a69bd8e6 1122 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
c99a89ed 1123 mgmt->sa, 0, plid,
6f101ef0 1124 WLAN_REASON_MESH_CONFIG);
c99a89ed
TP		 1125 goto unlock_rcu;
1126 } else if (!sta || event == PLINK_UNDEFINED) {
1127 /* something went wrong */
1128 goto unlock_rcu;
c3896d2c
LCC		 1129 }
1130
a69bd8e6
BC		 1131 if (event == CNF_ACPT) {
1132 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
0e0060fc 1133 if (!sta->mesh->plid)
a69bd8e6 1134 sta->mesh->plid = plid;
a69bd8e6
BC		 1135
1136 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1137 }
6c6fa496 1138
c7e67811 1139 changed |= mesh_plink_fsm(sdata, sta, event);
d0709a65 1140
fc10302e 1141unlock_rcu:
d0709a65 1142 rcu_read_unlock();
57aac7c5 1143
ecccd072 1144 if (changed)
2b5e1967 1145 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c 1146}
05a23ae9
TP		 1147
1148void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1149 struct ieee80211_mgmt *mgmt, size_t len,
1150 struct ieee80211_rx_status *rx_status)
1151{
1152 struct ieee802_11_elems elems;
1153 size_t baselen;
1154 u8 *baseaddr;
1155
1156 /* need action_code, aux */
1157 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1158 return;
1159
1160 if (sdata->u.mesh.user_mpm)
1161 /* userspace must register for these */
1162 return;
1163
1164 if (is_multicast_ether_addr(mgmt->da)) {
1165 mpl_dbg(sdata,
1166 "Mesh plink: ignore frame from multicast address\n");
1167 return;
1168 }
1169
1170 baseaddr = mgmt->u.action.u.self_prot.variable;
1171 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1172 if (mgmt->u.action.u.self_prot.action_code ==
1173 WLAN_SP_MESH_PEERING_CONFIRM) {
1174 baseaddr += 4;
1175 baselen += 4;
b3e7de87
BC		 1176
1177 if (baselen > len)
1178 return;
05a23ae9
TP		 1179 }
1180 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1181 mesh_process_plink_frame(sdata, mgmt, &elems);
1182}
Linux kernel - Deliverables
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