2 * Copyright (c) 2008, 2009 open80211s Ltd.
3 * Author: Luis Carlos Cobo <luisca@cozybit.com>
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.
10 #include <linux/kernel.h>
11 #include <linux/random.h>
12 #include "ieee80211_i.h"
16 #define PLINK_GET_LLID(p) (p + 2)
17 #define PLINK_GET_PLID(p) (p + 4)
19 #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \
20 jiffies + HZ * t / 1000))
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))
40 static const char * const mplstates[] = {
41 [NL80211_PLINK_LISTEN] = "LISTEN",
42 [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
43 [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
44 [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
45 [NL80211_PLINK_ESTAB] = "ESTAB",
46 [NL80211_PLINK_HOLDING] = "HOLDING",
47 [NL80211_PLINK_BLOCKED] = "BLOCKED"
50 static const char * const mplevents[] = {
51 [PLINK_UNDEFINED] = "NONE",
52 [OPN_ACPT] = "OPN_ACPT",
53 [OPN_RJCT] = "OPN_RJCT",
54 [OPN_IGNR] = "OPN_IGNR",
55 [CNF_ACPT] = "CNF_ACPT",
56 [CNF_RJCT] = "CNF_RJCT",
57 [CNF_IGNR] = "CNF_IGNR",
58 [CLS_ACPT] = "CLS_ACPT",
59 [CLS_IGNR] = "CLS_IGNR"
62 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
63 enum ieee80211_self_protected_actioncode action,
64 u8 *da, __le16 llid, __le16 plid, __le16 reason);
67 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
69 * @sta: mesh peer link to restart
71 * Locking: this function must be called holding sta->lock
73 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
75 sta->plink_state = NL80211_PLINK_LISTEN;
76 sta->llid = sta->plid = sta->reason = 0;
77 sta->plink_retries = 0;
81 * mesh_set_short_slot_time - enable / disable ERP short slot time.
83 * The standard indirectly mandates mesh STAs to turn off short slot time by
84 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
85 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
86 * MBSS support ERP rates.
88 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
90 static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
92 struct ieee80211_local *local = sdata->local;
93 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
94 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
96 u32 erp_rates = 0, changed = 0;
98 bool short_slot = false;
100 if (band == IEEE80211_BAND_5GHZ) {
101 /* (IEEE 802.11-2012 19.4.5) */
104 } else if (band != IEEE80211_BAND_2GHZ ||
105 (band == IEEE80211_BAND_2GHZ &&
106 local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
109 for (i = 0; i < sband->n_bitrates; i++)
110 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
117 list_for_each_entry_rcu(sta, &local->sta_list, list) {
118 if (sdata != sta->sdata ||
119 sta->plink_state != NL80211_PLINK_ESTAB)
123 if (erp_rates & sta->sta.supp_rates[band])
131 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
132 sdata->vif.bss_conf.use_short_slot = short_slot;
133 changed = BSS_CHANGED_ERP_SLOT;
134 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
135 sdata->vif.addr, short_slot);
141 * mesh_set_ht_prot_mode - set correct HT protection mode
143 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
144 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
145 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
146 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
147 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
148 * HT20 peer is present. Otherwise no-protection mode is selected.
150 static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
152 struct ieee80211_local *local = sdata->local;
153 struct sta_info *sta;
155 bool non_ht_sta = false, ht20_sta = false;
157 switch (sdata->vif.bss_conf.chandef.width) {
158 case NL80211_CHAN_WIDTH_20_NOHT:
159 case NL80211_CHAN_WIDTH_5:
160 case NL80211_CHAN_WIDTH_10:
167 list_for_each_entry_rcu(sta, &local->sta_list, list) {
168 if (sdata != sta->sdata ||
169 sta->plink_state != NL80211_PLINK_ESTAB)
172 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
175 if (!sta->sta.ht_cap.ht_supported) {
176 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
182 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
188 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
190 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
191 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
193 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
195 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
198 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
199 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
200 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
201 return BSS_CHANGED_HT;
205 * __mesh_plink_deactivate - deactivate mesh peer link
207 * @sta: mesh peer link to deactivate
209 * All mesh paths with this peer as next hop will be flushed
210 * Returns beacon changed flag if the beacon content changed.
212 * Locking: the caller must hold sta->lock
214 static u32 __mesh_plink_deactivate(struct sta_info *sta)
216 struct ieee80211_sub_if_data *sdata = sta->sdata;
219 if (sta->plink_state == NL80211_PLINK_ESTAB)
220 changed = mesh_plink_dec_estab_count(sdata);
221 sta->plink_state = NL80211_PLINK_BLOCKED;
222 mesh_path_flush_by_nexthop(sta);
224 ieee80211_mps_sta_status_update(sta);
225 changed |= ieee80211_mps_set_sta_local_pm(sta,
226 NL80211_MESH_POWER_UNKNOWN);
232 * mesh_plink_deactivate - deactivate mesh peer link
234 * @sta: mesh peer link to deactivate
236 * All mesh paths with this peer as next hop will be flushed
238 u32 mesh_plink_deactivate(struct sta_info *sta)
240 struct ieee80211_sub_if_data *sdata = sta->sdata;
243 spin_lock_bh(&sta->lock);
244 changed = __mesh_plink_deactivate(sta);
245 sta->reason = cpu_to_le16(WLAN_REASON_MESH_PEER_CANCELED);
246 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
247 sta->sta.addr, sta->llid, sta->plid,
249 spin_unlock_bh(&sta->lock);
254 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
255 enum ieee80211_self_protected_actioncode action,
256 u8 *da, __le16 llid, __le16 plid, __le16 reason)
258 struct ieee80211_local *local = sdata->local;
260 struct ieee80211_tx_info *info;
261 struct ieee80211_mgmt *mgmt;
262 bool include_plid = false;
263 u16 peering_proto = 0;
265 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
266 sizeof(mgmt->u.action.u.self_prot);
269 skb = dev_alloc_skb(local->tx_headroom +
271 2 + /* capability info */
273 2 + 8 + /* supported rates */
274 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
275 2 + sdata->u.mesh.mesh_id_len +
276 2 + sizeof(struct ieee80211_meshconf_ie) +
277 2 + sizeof(struct ieee80211_ht_cap) +
278 2 + sizeof(struct ieee80211_ht_operation) +
279 2 + 8 + /* peering IE */
280 sdata->u.mesh.ie_len);
283 info = IEEE80211_SKB_CB(skb);
284 skb_reserve(skb, local->tx_headroom);
285 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
286 memset(mgmt, 0, hdr_len);
287 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
288 IEEE80211_STYPE_ACTION);
289 memcpy(mgmt->da, da, ETH_ALEN);
290 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
291 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
292 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
293 mgmt->u.action.u.self_prot.action_code = action;
295 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
296 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
298 /* capability info */
299 pos = skb_put(skb, 2);
301 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
303 pos = skb_put(skb, 2);
304 memcpy(pos + 2, &plid, 2);
306 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
307 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
308 mesh_add_rsn_ie(sdata, skb) ||
309 mesh_add_meshid_ie(sdata, skb) ||
310 mesh_add_meshconf_ie(sdata, skb))
312 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
313 info->flags |= IEEE80211_TX_CTL_NO_ACK;
314 if (mesh_add_meshid_ie(sdata, skb))
318 /* Add Mesh Peering Management element */
320 case WLAN_SP_MESH_PEERING_OPEN:
322 case WLAN_SP_MESH_PEERING_CONFIRM:
326 case WLAN_SP_MESH_PEERING_CLOSE:
331 ie_len += 2; /* reason code */
338 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
341 pos = skb_put(skb, 2 + ie_len);
342 *pos++ = WLAN_EID_PEER_MGMT;
344 memcpy(pos, &peering_proto, 2);
346 memcpy(pos, &llid, 2);
349 memcpy(pos, &plid, 2);
352 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
353 memcpy(pos, &reason, 2);
357 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
358 if (mesh_add_ht_cap_ie(sdata, skb) ||
359 mesh_add_ht_oper_ie(sdata, skb))
363 if (mesh_add_vendor_ies(sdata, skb))
366 ieee80211_tx_skb(sdata, skb);
373 static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
374 struct sta_info *sta,
375 struct ieee802_11_elems *elems, bool insert)
377 struct ieee80211_local *local = sdata->local;
378 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
379 struct ieee80211_supported_band *sband;
380 u32 rates, basic_rates = 0, changed = 0;
382 sband = local->hw.wiphy->bands[band];
383 rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates);
385 spin_lock_bh(&sta->lock);
386 sta->last_rx = jiffies;
388 /* rates and capabilities don't change during peering */
389 if (sta->plink_state == NL80211_PLINK_ESTAB)
392 if (sta->sta.supp_rates[band] != rates)
393 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
394 sta->sta.supp_rates[band] = rates;
396 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
397 elems->ht_cap_elem, sta))
398 changed |= IEEE80211_RC_BW_CHANGED;
400 /* HT peer is operating 20MHz-only */
401 if (elems->ht_operation &&
402 !(elems->ht_operation->ht_param &
403 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
404 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
405 changed |= IEEE80211_RC_BW_CHANGED;
406 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
410 rate_control_rate_init(sta);
412 rate_control_rate_update(local, sband, sta, changed);
414 spin_unlock_bh(&sta->lock);
417 static struct sta_info *
418 __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
420 struct sta_info *sta;
422 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
425 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
429 sta->plink_state = NL80211_PLINK_LISTEN;
431 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
432 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
433 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
435 set_sta_flag(sta, WLAN_STA_WME);
440 static struct sta_info *
441 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
442 struct ieee802_11_elems *elems)
444 struct sta_info *sta = NULL;
446 /* Userspace handles station allocation */
447 if (sdata->u.mesh.user_mpm ||
448 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
449 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
454 sta = __mesh_sta_info_alloc(sdata, addr);
460 * mesh_sta_info_get - return mesh sta info entry for @addr.
462 * @sdata: local meshif
463 * @addr: peer's address
464 * @elems: IEs from beacon or mesh peering frame.
466 * Return existing or newly allocated sta_info under RCU read lock.
467 * (re)initialize with given IEs.
469 static struct sta_info *
470 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
471 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
473 struct sta_info *sta = NULL;
476 sta = sta_info_get(sdata, addr);
478 mesh_sta_info_init(sdata, sta, elems, false);
481 /* can't run atomic */
482 sta = mesh_sta_info_alloc(sdata, addr, elems);
488 mesh_sta_info_init(sdata, sta, elems, true);
490 if (sta_info_insert_rcu(sta))
498 * mesh_neighbour_update - update or initialize new mesh neighbor.
500 * @sdata: local meshif
501 * @addr: peer's address
502 * @elems: IEs from beacon or mesh peering frame
504 * Initiates peering if appropriate.
506 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
508 struct ieee802_11_elems *elems)
510 struct sta_info *sta;
513 sta = mesh_sta_info_get(sdata, hw_addr, elems);
517 if (mesh_peer_accepts_plinks(elems) &&
518 sta->plink_state == NL80211_PLINK_LISTEN &&
519 sdata->u.mesh.accepting_plinks &&
520 sdata->u.mesh.mshcfg.auto_open_plinks &&
521 rssi_threshold_check(sta, sdata))
522 changed = mesh_plink_open(sta);
524 ieee80211_mps_frame_release(sta, elems);
527 ieee80211_mbss_info_change_notify(sdata, changed);
530 static void mesh_plink_timer(unsigned long data)
532 struct sta_info *sta;
533 __le16 llid, plid, reason;
534 struct ieee80211_sub_if_data *sdata;
535 struct mesh_config *mshcfg;
536 enum ieee80211_self_protected_actioncode action = 0;
539 * This STA is valid because sta_info_destroy() will
540 * del_timer_sync() this timer after having made sure
541 * it cannot be readded (by deleting the plink.)
543 sta = (struct sta_info *) data;
545 if (sta->sdata->local->quiescing)
548 spin_lock_bh(&sta->lock);
549 if (sta->ignore_plink_timer) {
550 sta->ignore_plink_timer = false;
551 spin_unlock_bh(&sta->lock);
555 "Mesh plink timer for %pM fired on state %s\n",
556 sta->sta.addr, mplstates[sta->plink_state]);
561 mshcfg = &sdata->u.mesh.mshcfg;
563 switch (sta->plink_state) {
564 case NL80211_PLINK_OPN_RCVD:
565 case NL80211_PLINK_OPN_SNT:
567 if (sta->plink_retries < mshcfg->dot11MeshMaxRetries) {
570 "Mesh plink for %pM (retry, timeout): %d %d\n",
571 sta->sta.addr, sta->plink_retries,
573 get_random_bytes(&rand, sizeof(u32));
574 sta->plink_timeout = sta->plink_timeout +
575 rand % sta->plink_timeout;
576 ++sta->plink_retries;
577 mod_plink_timer(sta, sta->plink_timeout);
578 action = WLAN_SP_MESH_PEERING_OPEN;
581 reason = cpu_to_le16(WLAN_REASON_MESH_MAX_RETRIES);
582 /* fall through on else */
583 case NL80211_PLINK_CNF_RCVD:
586 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIRM_TIMEOUT);
587 sta->plink_state = NL80211_PLINK_HOLDING;
588 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
589 action = WLAN_SP_MESH_PEERING_CLOSE;
591 case NL80211_PLINK_HOLDING:
593 del_timer(&sta->plink_timer);
594 mesh_plink_fsm_restart(sta);
599 spin_unlock_bh(&sta->lock);
601 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
605 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
607 sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
608 sta->plink_timer.data = (unsigned long) sta;
609 sta->plink_timer.function = mesh_plink_timer;
610 sta->plink_timeout = timeout;
611 add_timer(&sta->plink_timer);
614 u32 mesh_plink_open(struct sta_info *sta)
617 struct ieee80211_sub_if_data *sdata = sta->sdata;
620 if (!test_sta_flag(sta, WLAN_STA_AUTH))
623 spin_lock_bh(&sta->lock);
624 get_random_bytes(&llid, 2);
626 if (sta->plink_state != NL80211_PLINK_LISTEN &&
627 sta->plink_state != NL80211_PLINK_BLOCKED) {
628 spin_unlock_bh(&sta->lock);
631 sta->plink_state = NL80211_PLINK_OPN_SNT;
632 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
633 spin_unlock_bh(&sta->lock);
635 "Mesh plink: starting establishment with %pM\n",
638 /* set the non-peer mode to active during peering */
639 changed = ieee80211_mps_local_status_update(sdata);
641 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
642 sta->sta.addr, llid, 0, 0);
646 u32 mesh_plink_block(struct sta_info *sta)
650 spin_lock_bh(&sta->lock);
651 changed = __mesh_plink_deactivate(sta);
652 sta->plink_state = NL80211_PLINK_BLOCKED;
653 spin_unlock_bh(&sta->lock);
658 static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
659 struct sta_info *sta,
660 enum plink_event event)
662 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
664 __le16 reason = (event == CLS_ACPT) ?
665 cpu_to_le16(WLAN_REASON_MESH_CLOSE) :
666 cpu_to_le16(WLAN_REASON_MESH_CONFIG);
668 sta->reason = reason;
669 sta->plink_state = NL80211_PLINK_HOLDING;
670 if (!mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout))
671 sta->ignore_plink_timer = true;
674 static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
675 struct sta_info *sta)
677 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
680 del_timer(&sta->plink_timer);
681 sta->plink_state = NL80211_PLINK_ESTAB;
682 changed |= mesh_plink_inc_estab_count(sdata);
683 changed |= mesh_set_ht_prot_mode(sdata);
684 changed |= mesh_set_short_slot_time(sdata);
685 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
686 ieee80211_mps_sta_status_update(sta);
687 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
692 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
693 struct ieee80211_mgmt *mgmt, size_t len,
694 struct ieee80211_rx_status *rx_status)
696 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
697 enum ieee80211_self_protected_actioncode action = 0;
698 struct ieee802_11_elems elems;
699 struct sta_info *sta;
700 enum plink_event event;
701 enum ieee80211_self_protected_actioncode ftype;
703 bool matches_local = true;
709 /* need action_code, aux */
710 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
713 if (sdata->u.mesh.user_mpm)
714 /* userspace must register for these */
717 if (is_multicast_ether_addr(mgmt->da)) {
719 "Mesh plink: ignore frame from multicast address\n");
723 baseaddr = mgmt->u.action.u.self_prot.variable;
724 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
725 if (mgmt->u.action.u.self_prot.action_code ==
726 WLAN_SP_MESH_PEERING_CONFIRM) {
730 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
732 if (!elems.peering) {
734 "Mesh plink: missing necessary peer link ie\n");
739 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
741 "Mesh plink: can't establish link with secure peer\n");
745 ftype = mgmt->u.action.u.self_prot.action_code;
746 ie_len = elems.peering_len;
747 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
748 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
749 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
752 "Mesh plink: incorrect plink ie length %d %d\n",
757 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
758 (!elems.mesh_id || !elems.mesh_config)) {
759 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
762 /* Note the lines below are correct, the llid in the frame is the plid
763 * from the point of view of this host.
765 memcpy(&plid, PLINK_GET_LLID(elems.peering), 2);
766 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
767 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
768 memcpy(&llid, PLINK_GET_PLID(elems.peering), 2);
770 /* WARNING: Only for sta pointer, is dropped & re-acquired */
773 sta = sta_info_get(sdata, mgmt->sa);
774 if (!sta && ftype != WLAN_SP_MESH_PEERING_OPEN) {
775 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
780 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
781 !rssi_threshold_check(sta, sdata)) {
782 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
788 if (sta && !test_sta_flag(sta, WLAN_STA_AUTH)) {
789 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
794 if (sta && sta->plink_state == NL80211_PLINK_BLOCKED) {
799 /* Now we will figure out the appropriate event... */
800 event = PLINK_UNDEFINED;
801 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
802 !mesh_matches_local(sdata, &elems)) {
803 matches_local = false;
805 case WLAN_SP_MESH_PEERING_OPEN:
808 case WLAN_SP_MESH_PEERING_CONFIRM:
816 if (!sta && !matches_local) {
819 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
820 mgmt->sa, llid, plid,
821 cpu_to_le16(WLAN_REASON_MESH_CONFIG));
824 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
825 if (!mesh_plink_free_count(sdata)) {
826 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
831 } else if (matches_local) {
833 case WLAN_SP_MESH_PEERING_OPEN:
834 if (!mesh_plink_free_count(sdata) ||
835 (sta->plid && sta->plid != plid))
840 case WLAN_SP_MESH_PEERING_CONFIRM:
841 if (!mesh_plink_free_count(sdata) ||
842 (sta->llid != llid || sta->plid != plid))
847 case WLAN_SP_MESH_PEERING_CLOSE:
848 if (sta->plink_state == NL80211_PLINK_ESTAB)
849 /* Do not check for llid or plid. This does not
850 * follow the standard but since multiple plinks
851 * per sta are not supported, it is necessary in
852 * order to avoid a livelock when MP A sees an
853 * establish peer link to MP B but MP B does not
854 * see it. This can be caused by a timeout in
855 * B's peer link establishment or B beign
859 else if (sta->plid != plid)
861 else if (ie_len == 8 && sta->llid != llid)
867 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
873 if (event == OPN_ACPT) {
875 /* allocate sta entry if necessary and update info */
876 sta = mesh_sta_info_get(sdata, mgmt->sa, &elems);
878 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
884 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", mgmt->sa,
885 mplstates[sta->plink_state], mplevents[event]);
886 spin_lock_bh(&sta->lock);
887 switch (sta->plink_state) {
888 case NL80211_PLINK_LISTEN:
891 mesh_plink_fsm_restart(sta);
894 sta->plink_state = NL80211_PLINK_OPN_RCVD;
896 get_random_bytes(&llid, 2);
898 mesh_plink_timer_set(sta,
899 mshcfg->dot11MeshRetryTimeout);
901 /* set the non-peer mode to active during peering */
902 changed |= ieee80211_mps_local_status_update(sdata);
904 action = WLAN_SP_MESH_PEERING_OPEN;
911 case NL80211_PLINK_OPN_SNT:
916 mesh_plink_close(sdata, sta, event);
917 action = WLAN_SP_MESH_PEERING_CLOSE;
921 /* retry timer is left untouched */
922 sta->plink_state = NL80211_PLINK_OPN_RCVD;
924 action = WLAN_SP_MESH_PEERING_CONFIRM;
927 sta->plink_state = NL80211_PLINK_CNF_RCVD;
928 if (!mod_plink_timer(sta,
929 mshcfg->dot11MeshConfirmTimeout))
930 sta->ignore_plink_timer = true;
938 case NL80211_PLINK_OPN_RCVD:
943 mesh_plink_close(sdata, sta, event);
944 action = WLAN_SP_MESH_PEERING_CLOSE;
947 action = WLAN_SP_MESH_PEERING_CONFIRM;
950 changed |= mesh_plink_establish(sdata, sta);
957 case NL80211_PLINK_CNF_RCVD:
962 mesh_plink_close(sdata, sta, event);
963 action = WLAN_SP_MESH_PEERING_CLOSE;
966 changed |= mesh_plink_establish(sdata, sta);
967 action = WLAN_SP_MESH_PEERING_CONFIRM;
974 case NL80211_PLINK_ESTAB:
977 changed |= __mesh_plink_deactivate(sta);
978 changed |= mesh_set_ht_prot_mode(sdata);
979 changed |= mesh_set_short_slot_time(sdata);
980 mesh_plink_close(sdata, sta, event);
981 action = WLAN_SP_MESH_PEERING_CLOSE;
984 action = WLAN_SP_MESH_PEERING_CONFIRM;
990 case NL80211_PLINK_HOLDING:
993 if (del_timer(&sta->plink_timer))
994 sta->ignore_plink_timer = 1;
995 mesh_plink_fsm_restart(sta);
1001 action = WLAN_SP_MESH_PEERING_CLOSE;
1008 /* should not get here, PLINK_BLOCKED is dealt with at the
1009 * beginning of the function
1013 spin_unlock_bh(&sta->lock);
1015 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
1016 sta->llid, sta->plid, sta->reason);
1018 /* also send confirm in open case */
1019 if (action == WLAN_SP_MESH_PEERING_OPEN) {
1020 mesh_plink_frame_tx(sdata,
1021 WLAN_SP_MESH_PEERING_CONFIRM,
1022 sta->sta.addr, sta->llid,
1030 ieee80211_mbss_info_change_notify(sdata, changed);