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 if (sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT)
161 list_for_each_entry_rcu(sta, &local->sta_list, list) {
162 if (sdata != sta->sdata ||
163 sta->plink_state != NL80211_PLINK_ESTAB)
166 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
169 if (!sta->sta.ht_cap.ht_supported) {
170 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
176 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
182 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
184 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
185 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
187 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
189 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
192 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
193 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
194 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
195 return BSS_CHANGED_HT;
199 * __mesh_plink_deactivate - deactivate mesh peer link
201 * @sta: mesh peer link to deactivate
203 * All mesh paths with this peer as next hop will be flushed
204 * Returns beacon changed flag if the beacon content changed.
206 * Locking: the caller must hold sta->lock
208 static u32 __mesh_plink_deactivate(struct sta_info *sta)
210 struct ieee80211_sub_if_data *sdata = sta->sdata;
213 if (sta->plink_state == NL80211_PLINK_ESTAB)
214 changed = mesh_plink_dec_estab_count(sdata);
215 sta->plink_state = NL80211_PLINK_BLOCKED;
216 mesh_path_flush_by_nexthop(sta);
218 ieee80211_mps_sta_status_update(sta);
219 changed |= ieee80211_mps_local_status_update(sdata);
225 * mesh_plink_deactivate - deactivate mesh peer link
227 * @sta: mesh peer link to deactivate
229 * All mesh paths with this peer as next hop will be flushed
231 u32 mesh_plink_deactivate(struct sta_info *sta)
233 struct ieee80211_sub_if_data *sdata = sta->sdata;
236 spin_lock_bh(&sta->lock);
237 changed = __mesh_plink_deactivate(sta);
238 sta->reason = cpu_to_le16(WLAN_REASON_MESH_PEER_CANCELED);
239 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
240 sta->sta.addr, sta->llid, sta->plid,
242 spin_unlock_bh(&sta->lock);
247 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
248 enum ieee80211_self_protected_actioncode action,
249 u8 *da, __le16 llid, __le16 plid, __le16 reason)
251 struct ieee80211_local *local = sdata->local;
253 struct ieee80211_tx_info *info;
254 struct ieee80211_mgmt *mgmt;
255 bool include_plid = false;
256 u16 peering_proto = 0;
258 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
259 sizeof(mgmt->u.action.u.self_prot);
262 skb = dev_alloc_skb(local->tx_headroom +
264 2 + /* capability info */
266 2 + 8 + /* supported rates */
267 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
268 2 + sdata->u.mesh.mesh_id_len +
269 2 + sizeof(struct ieee80211_meshconf_ie) +
270 2 + sizeof(struct ieee80211_ht_cap) +
271 2 + sizeof(struct ieee80211_ht_operation) +
272 2 + 8 + /* peering IE */
273 sdata->u.mesh.ie_len);
276 info = IEEE80211_SKB_CB(skb);
277 skb_reserve(skb, local->tx_headroom);
278 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
279 memset(mgmt, 0, hdr_len);
280 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
281 IEEE80211_STYPE_ACTION);
282 memcpy(mgmt->da, da, ETH_ALEN);
283 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
284 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
285 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
286 mgmt->u.action.u.self_prot.action_code = action;
288 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
289 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
291 /* capability info */
292 pos = skb_put(skb, 2);
294 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
296 pos = skb_put(skb, 2);
297 memcpy(pos + 2, &plid, 2);
299 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
300 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
301 mesh_add_rsn_ie(sdata, skb) ||
302 mesh_add_meshid_ie(sdata, skb) ||
303 mesh_add_meshconf_ie(sdata, skb))
305 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
306 info->flags |= IEEE80211_TX_CTL_NO_ACK;
307 if (mesh_add_meshid_ie(sdata, skb))
311 /* Add Mesh Peering Management element */
313 case WLAN_SP_MESH_PEERING_OPEN:
315 case WLAN_SP_MESH_PEERING_CONFIRM:
319 case WLAN_SP_MESH_PEERING_CLOSE:
324 ie_len += 2; /* reason code */
331 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
334 pos = skb_put(skb, 2 + ie_len);
335 *pos++ = WLAN_EID_PEER_MGMT;
337 memcpy(pos, &peering_proto, 2);
339 memcpy(pos, &llid, 2);
342 memcpy(pos, &plid, 2);
345 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
346 memcpy(pos, &reason, 2);
350 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
351 if (mesh_add_ht_cap_ie(sdata, skb) ||
352 mesh_add_ht_oper_ie(sdata, skb))
356 if (mesh_add_vendor_ies(sdata, skb))
359 ieee80211_tx_skb(sdata, skb);
366 static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
367 struct sta_info *sta,
368 struct ieee802_11_elems *elems, bool insert)
370 struct ieee80211_local *local = sdata->local;
371 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
372 struct ieee80211_supported_band *sband;
373 u32 rates, basic_rates = 0, changed = 0;
375 sband = local->hw.wiphy->bands[band];
376 rates = ieee80211_sta_get_rates(local, elems, band, &basic_rates);
378 spin_lock_bh(&sta->lock);
379 sta->last_rx = jiffies;
381 /* rates and capabilities don't change during peering */
382 if (sta->plink_state == NL80211_PLINK_ESTAB)
385 if (sta->sta.supp_rates[band] != rates)
386 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
387 sta->sta.supp_rates[band] = rates;
389 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
390 elems->ht_cap_elem, sta))
391 changed |= IEEE80211_RC_BW_CHANGED;
393 /* HT peer is operating 20MHz-only */
394 if (elems->ht_operation &&
395 !(elems->ht_operation->ht_param &
396 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
397 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
398 changed |= IEEE80211_RC_BW_CHANGED;
399 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
403 rate_control_rate_init(sta);
405 rate_control_rate_update(local, sband, sta, changed);
407 spin_unlock_bh(&sta->lock);
410 static struct sta_info *
411 __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
413 struct sta_info *sta;
415 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
418 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
422 sta->plink_state = NL80211_PLINK_LISTEN;
423 init_timer(&sta->plink_timer);
425 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
426 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
427 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
429 set_sta_flag(sta, WLAN_STA_WME);
434 static struct sta_info *
435 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
436 struct ieee802_11_elems *elems)
438 struct sta_info *sta = NULL;
440 /* Userspace handles station allocation */
441 if (sdata->u.mesh.user_mpm ||
442 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
443 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
448 sta = __mesh_sta_info_alloc(sdata, addr);
454 * mesh_sta_info_get - return mesh sta info entry for @addr.
456 * @sdata: local meshif
457 * @addr: peer's address
458 * @elems: IEs from beacon or mesh peering frame.
460 * Return existing or newly allocated sta_info under RCU read lock.
461 * (re)initialize with given IEs.
463 static struct sta_info *
464 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
465 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
467 struct sta_info *sta = NULL;
470 sta = sta_info_get(sdata, addr);
472 mesh_sta_info_init(sdata, sta, elems, false);
475 /* can't run atomic */
476 sta = mesh_sta_info_alloc(sdata, addr, elems);
482 mesh_sta_info_init(sdata, sta, elems, true);
484 if (sta_info_insert_rcu(sta))
492 * mesh_neighbour_update - update or initialize new mesh neighbor.
494 * @sdata: local meshif
495 * @addr: peer's address
496 * @elems: IEs from beacon or mesh peering frame
498 * Initiates peering if appropriate.
500 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
502 struct ieee802_11_elems *elems)
504 struct sta_info *sta;
507 sta = mesh_sta_info_get(sdata, hw_addr, elems);
511 if (mesh_peer_accepts_plinks(elems) &&
512 sta->plink_state == NL80211_PLINK_LISTEN &&
513 sdata->u.mesh.accepting_plinks &&
514 sdata->u.mesh.mshcfg.auto_open_plinks &&
515 rssi_threshold_check(sta, sdata))
516 changed = mesh_plink_open(sta);
518 ieee80211_mps_frame_release(sta, elems);
521 ieee80211_mbss_info_change_notify(sdata, changed);
524 static void mesh_plink_timer(unsigned long data)
526 struct sta_info *sta;
527 __le16 llid, plid, reason;
528 struct ieee80211_sub_if_data *sdata;
529 struct mesh_config *mshcfg;
532 * This STA is valid because sta_info_destroy() will
533 * del_timer_sync() this timer after having made sure
534 * it cannot be readded (by deleting the plink.)
536 sta = (struct sta_info *) data;
538 if (sta->sdata->local->quiescing)
541 spin_lock_bh(&sta->lock);
542 if (sta->ignore_plink_timer) {
543 sta->ignore_plink_timer = false;
544 spin_unlock_bh(&sta->lock);
548 "Mesh plink timer for %pM fired on state %d\n",
549 sta->sta.addr, sta->plink_state);
554 mshcfg = &sdata->u.mesh.mshcfg;
556 switch (sta->plink_state) {
557 case NL80211_PLINK_OPN_RCVD:
558 case NL80211_PLINK_OPN_SNT:
560 if (sta->plink_retries < mshcfg->dot11MeshMaxRetries) {
563 "Mesh plink for %pM (retry, timeout): %d %d\n",
564 sta->sta.addr, sta->plink_retries,
566 get_random_bytes(&rand, sizeof(u32));
567 sta->plink_timeout = sta->plink_timeout +
568 rand % sta->plink_timeout;
569 ++sta->plink_retries;
570 mod_plink_timer(sta, sta->plink_timeout);
571 spin_unlock_bh(&sta->lock);
572 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
573 sta->sta.addr, llid, 0, 0);
576 reason = cpu_to_le16(WLAN_REASON_MESH_MAX_RETRIES);
577 /* fall through on else */
578 case NL80211_PLINK_CNF_RCVD:
581 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIRM_TIMEOUT);
582 sta->plink_state = NL80211_PLINK_HOLDING;
583 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
584 spin_unlock_bh(&sta->lock);
585 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
586 sta->sta.addr, llid, plid, reason);
588 case NL80211_PLINK_HOLDING:
590 del_timer(&sta->plink_timer);
591 mesh_plink_fsm_restart(sta);
592 spin_unlock_bh(&sta->lock);
595 spin_unlock_bh(&sta->lock);
600 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
602 sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
603 sta->plink_timer.data = (unsigned long) sta;
604 sta->plink_timer.function = mesh_plink_timer;
605 sta->plink_timeout = timeout;
606 add_timer(&sta->plink_timer);
609 u32 mesh_plink_open(struct sta_info *sta)
612 struct ieee80211_sub_if_data *sdata = sta->sdata;
615 if (!test_sta_flag(sta, WLAN_STA_AUTH))
618 spin_lock_bh(&sta->lock);
619 get_random_bytes(&llid, 2);
621 if (sta->plink_state != NL80211_PLINK_LISTEN &&
622 sta->plink_state != NL80211_PLINK_BLOCKED) {
623 spin_unlock_bh(&sta->lock);
626 sta->plink_state = NL80211_PLINK_OPN_SNT;
627 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
628 spin_unlock_bh(&sta->lock);
630 "Mesh plink: starting establishment with %pM\n",
633 /* set the non-peer mode to active during peering */
634 changed = ieee80211_mps_local_status_update(sdata);
636 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
637 sta->sta.addr, llid, 0, 0);
641 u32 mesh_plink_block(struct sta_info *sta)
645 spin_lock_bh(&sta->lock);
646 changed = __mesh_plink_deactivate(sta);
647 sta->plink_state = NL80211_PLINK_BLOCKED;
648 spin_unlock_bh(&sta->lock);
654 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
655 struct ieee80211_mgmt *mgmt, size_t len,
656 struct ieee80211_rx_status *rx_status)
658 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
659 struct ieee802_11_elems elems;
660 struct sta_info *sta;
661 enum plink_event event;
662 enum ieee80211_self_protected_actioncode ftype;
664 bool matches_local = true;
668 __le16 plid, llid, reason;
670 /* need action_code, aux */
671 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
674 if (sdata->u.mesh.user_mpm)
675 /* userspace must register for these */
678 if (is_multicast_ether_addr(mgmt->da)) {
680 "Mesh plink: ignore frame from multicast address\n");
684 baseaddr = mgmt->u.action.u.self_prot.variable;
685 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
686 if (mgmt->u.action.u.self_prot.action_code ==
687 WLAN_SP_MESH_PEERING_CONFIRM) {
691 ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
693 if (!elems.peering) {
695 "Mesh plink: missing necessary peer link ie\n");
700 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
702 "Mesh plink: can't establish link with secure peer\n");
706 ftype = mgmt->u.action.u.self_prot.action_code;
707 ie_len = elems.peering_len;
708 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
709 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
710 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
713 "Mesh plink: incorrect plink ie length %d %d\n",
718 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
719 (!elems.mesh_id || !elems.mesh_config)) {
720 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
723 /* Note the lines below are correct, the llid in the frame is the plid
724 * from the point of view of this host.
726 memcpy(&plid, PLINK_GET_LLID(elems.peering), 2);
727 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
728 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
729 memcpy(&llid, PLINK_GET_PLID(elems.peering), 2);
731 /* WARNING: Only for sta pointer, is dropped & re-acquired */
734 sta = sta_info_get(sdata, mgmt->sa);
735 if (!sta && ftype != WLAN_SP_MESH_PEERING_OPEN) {
736 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
741 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
742 !rssi_threshold_check(sta, sdata)) {
743 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
749 if (sta && !test_sta_flag(sta, WLAN_STA_AUTH)) {
750 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
755 if (sta && sta->plink_state == NL80211_PLINK_BLOCKED) {
760 /* Now we will figure out the appropriate event... */
761 event = PLINK_UNDEFINED;
762 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
763 !mesh_matches_local(sdata, &elems)) {
764 matches_local = false;
766 case WLAN_SP_MESH_PEERING_OPEN:
769 case WLAN_SP_MESH_PEERING_CONFIRM:
777 if (!sta && !matches_local) {
779 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
781 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
782 mgmt->sa, llid, plid, reason);
785 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
786 if (!mesh_plink_free_count(sdata)) {
787 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
792 } else if (matches_local) {
794 case WLAN_SP_MESH_PEERING_OPEN:
795 if (!mesh_plink_free_count(sdata) ||
796 (sta->plid && sta->plid != plid))
801 case WLAN_SP_MESH_PEERING_CONFIRM:
802 if (!mesh_plink_free_count(sdata) ||
803 (sta->llid != llid || sta->plid != plid))
808 case WLAN_SP_MESH_PEERING_CLOSE:
809 if (sta->plink_state == NL80211_PLINK_ESTAB)
810 /* Do not check for llid or plid. This does not
811 * follow the standard but since multiple plinks
812 * per sta are not supported, it is necessary in
813 * order to avoid a livelock when MP A sees an
814 * establish peer link to MP B but MP B does not
815 * see it. This can be caused by a timeout in
816 * B's peer link establishment or B beign
820 else if (sta->plid != plid)
822 else if (ie_len == 7 && sta->llid != llid)
828 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
834 if (event == OPN_ACPT) {
836 /* allocate sta entry if necessary and update info */
837 sta = mesh_sta_info_get(sdata, mgmt->sa, &elems);
839 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
845 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", mgmt->sa,
846 mplstates[sta->plink_state], mplevents[event]);
848 spin_lock_bh(&sta->lock);
849 switch (sta->plink_state) {
850 /* spin_unlock as soon as state is updated at each case */
851 case NL80211_PLINK_LISTEN:
854 mesh_plink_fsm_restart(sta);
855 spin_unlock_bh(&sta->lock);
858 sta->plink_state = NL80211_PLINK_OPN_RCVD;
860 get_random_bytes(&llid, 2);
862 mesh_plink_timer_set(sta,
863 mshcfg->dot11MeshRetryTimeout);
865 /* set the non-peer mode to active during peering */
866 changed |= ieee80211_mps_local_status_update(sdata);
868 spin_unlock_bh(&sta->lock);
869 mesh_plink_frame_tx(sdata,
870 WLAN_SP_MESH_PEERING_OPEN,
871 sta->sta.addr, llid, 0, 0);
872 mesh_plink_frame_tx(sdata,
873 WLAN_SP_MESH_PEERING_CONFIRM,
874 sta->sta.addr, llid, plid, 0);
877 spin_unlock_bh(&sta->lock);
882 case NL80211_PLINK_OPN_SNT:
886 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
889 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
890 sta->reason = reason;
891 sta->plink_state = NL80211_PLINK_HOLDING;
892 if (!mod_plink_timer(sta,
893 mshcfg->dot11MeshHoldingTimeout))
894 sta->ignore_plink_timer = true;
897 spin_unlock_bh(&sta->lock);
898 mesh_plink_frame_tx(sdata,
899 WLAN_SP_MESH_PEERING_CLOSE,
900 sta->sta.addr, llid, plid, reason);
903 /* retry timer is left untouched */
904 sta->plink_state = NL80211_PLINK_OPN_RCVD;
907 spin_unlock_bh(&sta->lock);
908 mesh_plink_frame_tx(sdata,
909 WLAN_SP_MESH_PEERING_CONFIRM,
910 sta->sta.addr, llid, plid, 0);
913 sta->plink_state = NL80211_PLINK_CNF_RCVD;
914 if (!mod_plink_timer(sta,
915 mshcfg->dot11MeshConfirmTimeout))
916 sta->ignore_plink_timer = true;
918 spin_unlock_bh(&sta->lock);
921 spin_unlock_bh(&sta->lock);
926 case NL80211_PLINK_OPN_RCVD:
930 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
933 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
934 sta->reason = reason;
935 sta->plink_state = NL80211_PLINK_HOLDING;
936 if (!mod_plink_timer(sta,
937 mshcfg->dot11MeshHoldingTimeout))
938 sta->ignore_plink_timer = true;
941 spin_unlock_bh(&sta->lock);
942 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
943 sta->sta.addr, llid, plid, reason);
947 spin_unlock_bh(&sta->lock);
948 mesh_plink_frame_tx(sdata,
949 WLAN_SP_MESH_PEERING_CONFIRM,
950 sta->sta.addr, llid, plid, 0);
953 del_timer(&sta->plink_timer);
954 sta->plink_state = NL80211_PLINK_ESTAB;
955 spin_unlock_bh(&sta->lock);
956 changed |= mesh_plink_inc_estab_count(sdata);
957 changed |= mesh_set_ht_prot_mode(sdata);
958 changed |= mesh_set_short_slot_time(sdata);
959 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n",
961 ieee80211_mps_sta_status_update(sta);
962 changed |= ieee80211_mps_set_sta_local_pm(sta,
966 spin_unlock_bh(&sta->lock);
971 case NL80211_PLINK_CNF_RCVD:
975 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
978 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
979 sta->reason = reason;
980 sta->plink_state = NL80211_PLINK_HOLDING;
981 if (!mod_plink_timer(sta,
982 mshcfg->dot11MeshHoldingTimeout))
983 sta->ignore_plink_timer = true;
986 spin_unlock_bh(&sta->lock);
987 mesh_plink_frame_tx(sdata,
988 WLAN_SP_MESH_PEERING_CLOSE,
989 sta->sta.addr, llid, plid, reason);
992 del_timer(&sta->plink_timer);
993 sta->plink_state = NL80211_PLINK_ESTAB;
994 spin_unlock_bh(&sta->lock);
995 changed |= mesh_plink_inc_estab_count(sdata);
996 changed |= mesh_set_ht_prot_mode(sdata);
997 changed |= mesh_set_short_slot_time(sdata);
998 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n",
1000 mesh_plink_frame_tx(sdata,
1001 WLAN_SP_MESH_PEERING_CONFIRM,
1002 sta->sta.addr, llid, plid, 0);
1003 ieee80211_mps_sta_status_update(sta);
1004 changed |= ieee80211_mps_set_sta_local_pm(sta,
1005 mshcfg->power_mode);
1008 spin_unlock_bh(&sta->lock);
1013 case NL80211_PLINK_ESTAB:
1016 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
1017 sta->reason = reason;
1018 changed |= __mesh_plink_deactivate(sta);
1019 sta->plink_state = NL80211_PLINK_HOLDING;
1021 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
1022 spin_unlock_bh(&sta->lock);
1023 changed |= mesh_set_ht_prot_mode(sdata);
1024 changed |= mesh_set_short_slot_time(sdata);
1025 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
1026 sta->sta.addr, llid, plid, reason);
1030 spin_unlock_bh(&sta->lock);
1031 mesh_plink_frame_tx(sdata,
1032 WLAN_SP_MESH_PEERING_CONFIRM,
1033 sta->sta.addr, llid, plid, 0);
1036 spin_unlock_bh(&sta->lock);
1040 case NL80211_PLINK_HOLDING:
1043 if (del_timer(&sta->plink_timer))
1044 sta->ignore_plink_timer = 1;
1045 mesh_plink_fsm_restart(sta);
1046 spin_unlock_bh(&sta->lock);
1053 reason = sta->reason;
1054 spin_unlock_bh(&sta->lock);
1055 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
1056 sta->sta.addr, llid, plid, reason);
1059 spin_unlock_bh(&sta->lock);
1063 /* should not get here, PLINK_BLOCKED is dealt with at the
1064 * beginning of the function
1066 spin_unlock_bh(&sta->lock);
1073 ieee80211_mbss_info_change_notify(sdata, changed);