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))
34 static const char * const mplstates[] = {
35 [NL80211_PLINK_LISTEN] = "LISTEN",
36 [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
37 [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
38 [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
39 [NL80211_PLINK_ESTAB] = "ESTAB",
40 [NL80211_PLINK_HOLDING] = "HOLDING",
41 [NL80211_PLINK_BLOCKED] = "BLOCKED"
44 static const char * const mplevents[] = {
45 [PLINK_UNDEFINED] = "NONE",
46 [OPN_ACPT] = "OPN_ACPT",
47 [OPN_RJCT] = "OPN_RJCT",
48 [OPN_IGNR] = "OPN_IGNR",
49 [CNF_ACPT] = "CNF_ACPT",
50 [CNF_RJCT] = "CNF_RJCT",
51 [CNF_IGNR] = "CNF_IGNR",
52 [CLS_ACPT] = "CLS_ACPT",
53 [CLS_IGNR] = "CLS_IGNR"
56 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
57 enum ieee80211_self_protected_actioncode action,
58 u8 *da, u16 llid, u16 plid, u16 reason);
61 /* We only need a valid sta if user configured a minimum rssi_threshold. */
62 static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
65 s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
66 return rssi_threshold == 0 ||
67 (sta && (s8) -ewma_read(&sta->avg_signal) > rssi_threshold);
71 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
73 * @sta: mesh peer link to restart
75 * Locking: this function must be called holding sta->lock
77 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
79 sta->plink_state = NL80211_PLINK_LISTEN;
80 sta->llid = sta->plid = sta->reason = 0;
81 sta->plink_retries = 0;
85 * mesh_set_short_slot_time - enable / disable ERP short slot time.
87 * The standard indirectly mandates mesh STAs to turn off short slot time by
88 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
89 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
90 * MBSS support ERP rates.
92 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
94 static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
96 struct ieee80211_local *local = sdata->local;
97 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
98 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
100 u32 erp_rates = 0, changed = 0;
102 bool short_slot = false;
104 if (band == IEEE80211_BAND_5GHZ) {
105 /* (IEEE 802.11-2012 19.4.5) */
108 } else if (band != IEEE80211_BAND_2GHZ ||
109 (band == IEEE80211_BAND_2GHZ &&
110 local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
113 for (i = 0; i < sband->n_bitrates; i++)
114 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
121 list_for_each_entry_rcu(sta, &local->sta_list, list) {
122 if (sdata != sta->sdata ||
123 sta->plink_state != NL80211_PLINK_ESTAB)
127 if (erp_rates & sta->sta.supp_rates[band])
135 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
136 sdata->vif.bss_conf.use_short_slot = short_slot;
137 changed = BSS_CHANGED_ERP_SLOT;
138 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
139 sdata->vif.addr, short_slot);
145 * mesh_set_ht_prot_mode - set correct HT protection mode
147 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
148 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
149 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
150 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
151 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
152 * HT20 peer is present. Otherwise no-protection mode is selected.
154 static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
156 struct ieee80211_local *local = sdata->local;
157 struct sta_info *sta;
159 bool non_ht_sta = false, ht20_sta = false;
161 switch (sdata->vif.bss_conf.chandef.width) {
162 case NL80211_CHAN_WIDTH_20_NOHT:
163 case NL80211_CHAN_WIDTH_5:
164 case NL80211_CHAN_WIDTH_10:
171 list_for_each_entry_rcu(sta, &local->sta_list, list) {
172 if (sdata != sta->sdata ||
173 sta->plink_state != NL80211_PLINK_ESTAB)
176 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
179 if (!sta->sta.ht_cap.ht_supported) {
180 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
186 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
192 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
194 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
195 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
197 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
199 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
202 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
203 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
204 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
205 return BSS_CHANGED_HT;
209 * __mesh_plink_deactivate - deactivate mesh peer link
211 * @sta: mesh peer link to deactivate
213 * All mesh paths with this peer as next hop will be flushed
214 * Returns beacon changed flag if the beacon content changed.
216 * Locking: the caller must hold sta->lock
218 static u32 __mesh_plink_deactivate(struct sta_info *sta)
220 struct ieee80211_sub_if_data *sdata = sta->sdata;
223 if (sta->plink_state == NL80211_PLINK_ESTAB)
224 changed = mesh_plink_dec_estab_count(sdata);
225 sta->plink_state = NL80211_PLINK_BLOCKED;
226 mesh_path_flush_by_nexthop(sta);
228 ieee80211_mps_sta_status_update(sta);
229 changed |= ieee80211_mps_set_sta_local_pm(sta,
230 NL80211_MESH_POWER_UNKNOWN);
236 * mesh_plink_deactivate - deactivate mesh peer link
238 * @sta: mesh peer link to deactivate
240 * All mesh paths with this peer as next hop will be flushed
242 u32 mesh_plink_deactivate(struct sta_info *sta)
244 struct ieee80211_sub_if_data *sdata = sta->sdata;
247 spin_lock_bh(&sta->lock);
248 changed = __mesh_plink_deactivate(sta);
249 sta->reason = WLAN_REASON_MESH_PEER_CANCELED;
250 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
251 sta->sta.addr, sta->llid, sta->plid,
253 spin_unlock_bh(&sta->lock);
258 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
259 enum ieee80211_self_protected_actioncode action,
260 u8 *da, u16 llid, u16 plid, u16 reason)
262 struct ieee80211_local *local = sdata->local;
264 struct ieee80211_tx_info *info;
265 struct ieee80211_mgmt *mgmt;
266 bool include_plid = false;
267 u16 peering_proto = 0;
269 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
270 sizeof(mgmt->u.action.u.self_prot);
273 skb = dev_alloc_skb(local->tx_headroom +
275 2 + /* capability info */
277 2 + 8 + /* supported rates */
278 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
279 2 + sdata->u.mesh.mesh_id_len +
280 2 + sizeof(struct ieee80211_meshconf_ie) +
281 2 + sizeof(struct ieee80211_ht_cap) +
282 2 + sizeof(struct ieee80211_ht_operation) +
283 2 + 8 + /* peering IE */
284 sdata->u.mesh.ie_len);
287 info = IEEE80211_SKB_CB(skb);
288 skb_reserve(skb, local->tx_headroom);
289 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
290 memset(mgmt, 0, hdr_len);
291 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
292 IEEE80211_STYPE_ACTION);
293 memcpy(mgmt->da, da, ETH_ALEN);
294 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
295 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
296 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
297 mgmt->u.action.u.self_prot.action_code = action;
299 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
300 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
302 /* capability info */
303 pos = skb_put(skb, 2);
305 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
307 pos = skb_put(skb, 2);
308 put_unaligned_le16(plid, pos + 2);
310 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
311 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
312 mesh_add_rsn_ie(sdata, skb) ||
313 mesh_add_meshid_ie(sdata, skb) ||
314 mesh_add_meshconf_ie(sdata, skb))
316 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
317 info->flags |= IEEE80211_TX_CTL_NO_ACK;
318 if (mesh_add_meshid_ie(sdata, skb))
322 /* Add Mesh Peering Management element */
324 case WLAN_SP_MESH_PEERING_OPEN:
326 case WLAN_SP_MESH_PEERING_CONFIRM:
330 case WLAN_SP_MESH_PEERING_CLOSE:
335 ie_len += 2; /* reason code */
342 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
345 pos = skb_put(skb, 2 + ie_len);
346 *pos++ = WLAN_EID_PEER_MGMT;
348 memcpy(pos, &peering_proto, 2);
350 put_unaligned_le16(llid, pos);
353 put_unaligned_le16(plid, pos);
356 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
357 put_unaligned_le16(reason, pos);
361 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
362 if (mesh_add_ht_cap_ie(sdata, skb) ||
363 mesh_add_ht_oper_ie(sdata, skb))
367 if (mesh_add_vendor_ies(sdata, skb))
370 ieee80211_tx_skb(sdata, skb);
377 static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
378 struct sta_info *sta,
379 struct ieee802_11_elems *elems, bool insert)
381 struct ieee80211_local *local = sdata->local;
382 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
383 struct ieee80211_supported_band *sband;
384 u32 rates, basic_rates = 0, changed = 0;
386 sband = local->hw.wiphy->bands[band];
387 rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates);
389 spin_lock_bh(&sta->lock);
390 sta->last_rx = jiffies;
392 /* rates and capabilities don't change during peering */
393 if (sta->plink_state == NL80211_PLINK_ESTAB)
396 if (sta->sta.supp_rates[band] != rates)
397 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
398 sta->sta.supp_rates[band] = rates;
400 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
401 elems->ht_cap_elem, sta))
402 changed |= IEEE80211_RC_BW_CHANGED;
404 /* HT peer is operating 20MHz-only */
405 if (elems->ht_operation &&
406 !(elems->ht_operation->ht_param &
407 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
408 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
409 changed |= IEEE80211_RC_BW_CHANGED;
410 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
414 rate_control_rate_init(sta);
416 rate_control_rate_update(local, sband, sta, changed);
418 spin_unlock_bh(&sta->lock);
421 static struct sta_info *
422 __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
424 struct sta_info *sta;
426 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
429 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
433 sta->plink_state = NL80211_PLINK_LISTEN;
435 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
436 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
437 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
439 set_sta_flag(sta, WLAN_STA_WME);
445 static struct sta_info *
446 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
447 struct ieee802_11_elems *elems)
449 struct sta_info *sta = NULL;
451 /* Userspace handles station allocation */
452 if (sdata->u.mesh.user_mpm ||
453 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
454 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
459 sta = __mesh_sta_info_alloc(sdata, addr);
465 * mesh_sta_info_get - return mesh sta info entry for @addr.
467 * @sdata: local meshif
468 * @addr: peer's address
469 * @elems: IEs from beacon or mesh peering frame.
471 * Return existing or newly allocated sta_info under RCU read lock.
472 * (re)initialize with given IEs.
474 static struct sta_info *
475 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
476 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
478 struct sta_info *sta = NULL;
481 sta = sta_info_get(sdata, addr);
483 mesh_sta_info_init(sdata, sta, elems, false);
486 /* can't run atomic */
487 sta = mesh_sta_info_alloc(sdata, addr, elems);
493 mesh_sta_info_init(sdata, sta, elems, true);
495 if (sta_info_insert_rcu(sta))
503 * mesh_neighbour_update - update or initialize new mesh neighbor.
505 * @sdata: local meshif
506 * @addr: peer's address
507 * @elems: IEs from beacon or mesh peering frame
509 * Initiates peering if appropriate.
511 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
513 struct ieee802_11_elems *elems)
515 struct sta_info *sta;
518 sta = mesh_sta_info_get(sdata, hw_addr, elems);
522 if (mesh_peer_accepts_plinks(elems) &&
523 sta->plink_state == NL80211_PLINK_LISTEN &&
524 sdata->u.mesh.accepting_plinks &&
525 sdata->u.mesh.mshcfg.auto_open_plinks &&
526 rssi_threshold_check(sdata, sta))
527 changed = mesh_plink_open(sta);
529 ieee80211_mps_frame_release(sta, elems);
532 ieee80211_mbss_info_change_notify(sdata, changed);
535 static void mesh_plink_timer(unsigned long data)
537 struct sta_info *sta;
539 struct ieee80211_sub_if_data *sdata;
540 struct mesh_config *mshcfg;
541 enum ieee80211_self_protected_actioncode action = 0;
544 * This STA is valid because sta_info_destroy() will
545 * del_timer_sync() this timer after having made sure
546 * it cannot be readded (by deleting the plink.)
548 sta = (struct sta_info *) data;
550 if (sta->sdata->local->quiescing)
553 spin_lock_bh(&sta->lock);
555 /* If a timer fires just before a state transition on another CPU,
556 * we may have already extended the timeout and changed state by the
557 * time we've acquired the lock and arrived here. In that case,
558 * skip this timer and wait for the new one.
560 if (time_before(jiffies, sta->plink_timer.expires)) {
562 "Ignoring timer for %pM in state %s (timer adjusted)",
563 sta->sta.addr, mplstates[sta->plink_state]);
564 spin_unlock_bh(&sta->lock);
568 /* del_timer() and handler may race when entering these states */
569 if (sta->plink_state == NL80211_PLINK_LISTEN ||
570 sta->plink_state == NL80211_PLINK_ESTAB) {
572 "Ignoring timer for %pM in state %s (timer deleted)",
573 sta->sta.addr, mplstates[sta->plink_state]);
574 spin_unlock_bh(&sta->lock);
579 "Mesh plink timer for %pM fired on state %s\n",
580 sta->sta.addr, mplstates[sta->plink_state]);
582 mshcfg = &sdata->u.mesh.mshcfg;
584 switch (sta->plink_state) {
585 case NL80211_PLINK_OPN_RCVD:
586 case NL80211_PLINK_OPN_SNT:
588 if (sta->plink_retries < mshcfg->dot11MeshMaxRetries) {
591 "Mesh plink for %pM (retry, timeout): %d %d\n",
592 sta->sta.addr, sta->plink_retries,
594 get_random_bytes(&rand, sizeof(u32));
595 sta->plink_timeout = sta->plink_timeout +
596 rand % sta->plink_timeout;
597 ++sta->plink_retries;
598 mod_plink_timer(sta, sta->plink_timeout);
599 action = WLAN_SP_MESH_PEERING_OPEN;
602 reason = WLAN_REASON_MESH_MAX_RETRIES;
603 /* fall through on else */
604 case NL80211_PLINK_CNF_RCVD:
607 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
608 sta->plink_state = NL80211_PLINK_HOLDING;
609 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
610 action = WLAN_SP_MESH_PEERING_CLOSE;
612 case NL80211_PLINK_HOLDING:
614 del_timer(&sta->plink_timer);
615 mesh_plink_fsm_restart(sta);
620 spin_unlock_bh(&sta->lock);
622 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
623 sta->llid, sta->plid, reason);
626 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
628 sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
629 sta->plink_timer.data = (unsigned long) sta;
630 sta->plink_timer.function = mesh_plink_timer;
631 sta->plink_timeout = timeout;
632 add_timer(&sta->plink_timer);
635 static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
638 struct ieee80211_local *local = sdata->local;
640 struct sta_info *sta;
643 list_for_each_entry_rcu(sta, &local->sta_list, list) {
644 if (!memcmp(&sta->llid, &llid, sizeof(llid))) {
654 static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
659 get_random_bytes(&llid, sizeof(llid));
660 /* for mesh PS we still only have the AID range for TIM bits */
661 llid = (llid % IEEE80211_MAX_AID) + 1;
662 } while (llid_in_use(sdata, llid));
667 u32 mesh_plink_open(struct sta_info *sta)
669 struct ieee80211_sub_if_data *sdata = sta->sdata;
672 if (!test_sta_flag(sta, WLAN_STA_AUTH))
675 spin_lock_bh(&sta->lock);
676 sta->llid = mesh_get_new_llid(sdata);
677 if (sta->plink_state != NL80211_PLINK_LISTEN &&
678 sta->plink_state != NL80211_PLINK_BLOCKED) {
679 spin_unlock_bh(&sta->lock);
682 sta->plink_state = NL80211_PLINK_OPN_SNT;
683 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
684 spin_unlock_bh(&sta->lock);
686 "Mesh plink: starting establishment with %pM\n",
689 /* set the non-peer mode to active during peering */
690 changed = ieee80211_mps_local_status_update(sdata);
692 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
693 sta->sta.addr, sta->llid, 0, 0);
697 u32 mesh_plink_block(struct sta_info *sta)
701 spin_lock_bh(&sta->lock);
702 changed = __mesh_plink_deactivate(sta);
703 sta->plink_state = NL80211_PLINK_BLOCKED;
704 spin_unlock_bh(&sta->lock);
709 static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
710 struct sta_info *sta,
711 enum plink_event event)
713 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
715 u16 reason = (event == CLS_ACPT) ?
716 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
718 sta->reason = reason;
719 sta->plink_state = NL80211_PLINK_HOLDING;
720 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
723 static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
724 struct sta_info *sta)
726 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
729 del_timer(&sta->plink_timer);
730 sta->plink_state = NL80211_PLINK_ESTAB;
731 changed |= mesh_plink_inc_estab_count(sdata);
732 changed |= mesh_set_ht_prot_mode(sdata);
733 changed |= mesh_set_short_slot_time(sdata);
734 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
735 ieee80211_mps_sta_status_update(sta);
736 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
741 * mesh_plink_fsm - step @sta MPM based on @event
744 * @sta: mesh neighbor
745 * @event: peering event
747 * Return: changed MBSS flags
749 static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
750 struct sta_info *sta, enum plink_event event)
752 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
753 enum ieee80211_self_protected_actioncode action = 0;
756 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
757 mplstates[sta->plink_state], mplevents[event]);
759 spin_lock_bh(&sta->lock);
760 switch (sta->plink_state) {
761 case NL80211_PLINK_LISTEN:
764 mesh_plink_fsm_restart(sta);
767 sta->plink_state = NL80211_PLINK_OPN_RCVD;
768 sta->llid = mesh_get_new_llid(sdata);
769 mesh_plink_timer_set(sta,
770 mshcfg->dot11MeshRetryTimeout);
772 /* set the non-peer mode to active during peering */
773 changed |= ieee80211_mps_local_status_update(sdata);
774 action = WLAN_SP_MESH_PEERING_OPEN;
780 case NL80211_PLINK_OPN_SNT:
785 mesh_plink_close(sdata, sta, event);
786 action = WLAN_SP_MESH_PEERING_CLOSE;
789 /* retry timer is left untouched */
790 sta->plink_state = NL80211_PLINK_OPN_RCVD;
791 action = WLAN_SP_MESH_PEERING_CONFIRM;
794 sta->plink_state = NL80211_PLINK_CNF_RCVD;
795 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
801 case NL80211_PLINK_OPN_RCVD:
806 mesh_plink_close(sdata, sta, event);
807 action = WLAN_SP_MESH_PEERING_CLOSE;
810 action = WLAN_SP_MESH_PEERING_CONFIRM;
813 changed |= mesh_plink_establish(sdata, sta);
819 case NL80211_PLINK_CNF_RCVD:
824 mesh_plink_close(sdata, sta, event);
825 action = WLAN_SP_MESH_PEERING_CLOSE;
828 changed |= mesh_plink_establish(sdata, sta);
829 action = WLAN_SP_MESH_PEERING_CONFIRM;
835 case NL80211_PLINK_ESTAB:
838 changed |= __mesh_plink_deactivate(sta);
839 changed |= mesh_set_ht_prot_mode(sdata);
840 changed |= mesh_set_short_slot_time(sdata);
841 mesh_plink_close(sdata, sta, event);
842 action = WLAN_SP_MESH_PEERING_CLOSE;
845 action = WLAN_SP_MESH_PEERING_CONFIRM;
851 case NL80211_PLINK_HOLDING:
854 del_timer(&sta->plink_timer);
855 mesh_plink_fsm_restart(sta);
861 action = WLAN_SP_MESH_PEERING_CLOSE;
868 /* should not get here, PLINK_BLOCKED is dealt with at the
869 * beginning of the function
873 spin_unlock_bh(&sta->lock);
875 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
876 sta->llid, sta->plid, sta->reason);
878 /* also send confirm in open case */
879 if (action == WLAN_SP_MESH_PEERING_OPEN) {
880 mesh_plink_frame_tx(sdata,
881 WLAN_SP_MESH_PEERING_CONFIRM,
882 sta->sta.addr, sta->llid,
891 * mesh_plink_get_event - get correct MPM event
894 * @sta: peer, leave NULL if processing a frame from a new suitable peer
895 * @elems: peering management IEs
897 * @llid: peer's peer link ID
898 * @plid: peer's local link ID
900 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
903 static enum plink_event
904 mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
905 struct sta_info *sta,
906 struct ieee802_11_elems *elems,
907 enum ieee80211_self_protected_actioncode ftype,
910 enum plink_event event = PLINK_UNDEFINED;
911 u8 ie_len = elems->peering_len;
914 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
915 mesh_matches_local(sdata, elems));
917 /* deny open request from non-matching peer */
918 if (!matches_local && !sta) {
924 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
925 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
928 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
929 if (!mesh_plink_free_count(sdata)) {
930 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
934 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
935 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
938 if (sta->plink_state == NL80211_PLINK_BLOCKED)
942 /* new matching peer */
949 case WLAN_SP_MESH_PEERING_OPEN:
952 if (!mesh_plink_free_count(sdata) ||
953 (sta->plid && sta->plid != plid))
958 case WLAN_SP_MESH_PEERING_CONFIRM:
961 if (!mesh_plink_free_count(sdata) ||
963 (sta->plid && sta->plid != plid))
968 case WLAN_SP_MESH_PEERING_CLOSE:
969 if (sta->plink_state == NL80211_PLINK_ESTAB)
970 /* Do not check for llid or plid. This does not
971 * follow the standard but since multiple plinks
972 * per sta are not supported, it is necessary in
973 * order to avoid a livelock when MP A sees an
974 * establish peer link to MP B but MP B does not
975 * see it. This can be caused by a timeout in
976 * B's peer link establishment or B beign
980 else if (sta->plid != plid)
982 else if (ie_len == 8 && sta->llid != llid)
988 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
997 mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
998 struct ieee80211_mgmt *mgmt,
999 struct ieee802_11_elems *elems)
1002 struct sta_info *sta;
1003 enum plink_event event;
1004 enum ieee80211_self_protected_actioncode ftype;
1006 u8 ie_len = elems->peering_len;
1007 __le16 _plid, _llid;
1010 if (!elems->peering) {
1012 "Mesh plink: missing necessary peer link ie\n");
1016 if (elems->rsn_len &&
1017 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1019 "Mesh plink: can't establish link with secure peer\n");
1023 ftype = mgmt->u.action.u.self_prot.action_code;
1024 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1025 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1026 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1029 "Mesh plink: incorrect plink ie length %d %d\n",
1034 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1035 (!elems->mesh_id || !elems->mesh_config)) {
1036 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1039 /* Note the lines below are correct, the llid in the frame is the plid
1040 * from the point of view of this host.
1042 memcpy(&_plid, PLINK_GET_LLID(elems->peering), sizeof(__le16));
1043 plid = le16_to_cpu(_plid);
1044 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1045 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8)) {
1046 memcpy(&_llid, PLINK_GET_PLID(elems->peering), sizeof(__le16));
1047 llid = le16_to_cpu(_llid);
1050 /* WARNING: Only for sta pointer, is dropped & re-acquired */
1053 sta = sta_info_get(sdata, mgmt->sa);
1055 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1056 !rssi_threshold_check(sdata, sta)) {
1057 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1062 /* Now we will figure out the appropriate event... */
1063 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1065 if (event == OPN_ACPT) {
1067 /* allocate sta entry if necessary and update info */
1068 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
1070 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1074 } else if (!sta && event == OPN_RJCT) {
1075 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
1077 WLAN_REASON_MESH_CONFIG);
1079 } else if (!sta || event == PLINK_UNDEFINED) {
1080 /* something went wrong */
1084 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1085 if (!sta->plid && event == CNF_ACPT)
1088 changed |= mesh_plink_fsm(sdata, sta, event);
1094 ieee80211_mbss_info_change_notify(sdata, changed);
1097 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1098 struct ieee80211_mgmt *mgmt, size_t len,
1099 struct ieee80211_rx_status *rx_status)
1101 struct ieee802_11_elems elems;
1105 /* need action_code, aux */
1106 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1109 if (sdata->u.mesh.user_mpm)
1110 /* userspace must register for these */
1113 if (is_multicast_ether_addr(mgmt->da)) {
1115 "Mesh plink: ignore frame from multicast address\n");
1119 baseaddr = mgmt->u.action.u.self_prot.variable;
1120 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1121 if (mgmt->u.action.u.self_prot.action_code ==
1122 WLAN_SP_MESH_PEERING_CONFIRM) {
1126 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1127 mesh_process_plink_frame(sdata, mgmt, &elems);