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_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2)
17 #define PLINK_GET_LLID(p) (p + 2)
18 #define PLINK_GET_PLID(p) (p + 4)
20 #define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \
21 jiffies + msecs_to_jiffies(t)))
35 static 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"
45 static 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"
57 /* We only need a valid sta if user configured a minimum rssi_threshold. */
58 static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
61 s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
62 return rssi_threshold == 0 ||
63 (sta && (s8) -ewma_signal_read(&sta->avg_signal) > rssi_threshold);
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->mesh->plink_lock
73 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
75 lockdep_assert_held(&sta->mesh->plink_lock);
76 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
77 sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0;
78 sta->mesh->plink_retries = 0;
82 * mesh_set_short_slot_time - enable / disable ERP short slot time.
84 * The standard indirectly mandates mesh STAs to turn off short slot time by
85 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
86 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
87 * MBSS support ERP rates.
89 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
91 static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
93 struct ieee80211_local *local = sdata->local;
94 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
95 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
97 u32 erp_rates = 0, changed = 0;
99 bool short_slot = false;
101 if (band == IEEE80211_BAND_5GHZ) {
102 /* (IEEE 802.11-2012 19.4.5) */
105 } else if (band != IEEE80211_BAND_2GHZ)
108 for (i = 0; i < sband->n_bitrates; i++)
109 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
116 list_for_each_entry_rcu(sta, &local->sta_list, list) {
117 if (sdata != sta->sdata ||
118 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
122 if (erp_rates & sta->sta.supp_rates[band])
130 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
131 sdata->vif.bss_conf.use_short_slot = short_slot;
132 changed = BSS_CHANGED_ERP_SLOT;
133 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
134 sdata->vif.addr, short_slot);
140 * mesh_set_ht_prot_mode - set correct HT protection mode
142 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
143 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
144 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
145 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
146 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
147 * HT20 peer is present. Otherwise no-protection mode is selected.
149 static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
151 struct ieee80211_local *local = sdata->local;
152 struct sta_info *sta;
154 bool non_ht_sta = false, ht20_sta = false;
156 switch (sdata->vif.bss_conf.chandef.width) {
157 case NL80211_CHAN_WIDTH_20_NOHT:
158 case NL80211_CHAN_WIDTH_5:
159 case NL80211_CHAN_WIDTH_10:
166 list_for_each_entry_rcu(sta, &local->sta_list, list) {
167 if (sdata != sta->sdata ||
168 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
171 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
174 if (!sta->sta.ht_cap.ht_supported) {
175 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
181 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
187 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
189 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
190 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
192 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
194 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
197 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
198 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
199 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
200 return BSS_CHANGED_HT;
203 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
204 struct sta_info *sta,
205 enum ieee80211_self_protected_actioncode action,
206 u8 *da, u16 llid, u16 plid, u16 reason)
208 struct ieee80211_local *local = sdata->local;
210 struct ieee80211_tx_info *info;
211 struct ieee80211_mgmt *mgmt;
212 bool include_plid = false;
213 u16 peering_proto = 0;
215 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
216 sizeof(mgmt->u.action.u.self_prot);
219 skb = dev_alloc_skb(local->tx_headroom +
221 2 + /* capability info */
223 2 + 8 + /* supported rates */
224 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
225 2 + sdata->u.mesh.mesh_id_len +
226 2 + sizeof(struct ieee80211_meshconf_ie) +
227 2 + sizeof(struct ieee80211_ht_cap) +
228 2 + sizeof(struct ieee80211_ht_operation) +
229 2 + 8 + /* peering IE */
230 sdata->u.mesh.ie_len);
233 info = IEEE80211_SKB_CB(skb);
234 skb_reserve(skb, local->tx_headroom);
235 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
236 memset(mgmt, 0, hdr_len);
237 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
238 IEEE80211_STYPE_ACTION);
239 memcpy(mgmt->da, da, ETH_ALEN);
240 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
241 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
242 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
243 mgmt->u.action.u.self_prot.action_code = action;
245 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
246 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
248 /* capability info */
249 pos = skb_put(skb, 2);
251 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
253 pos = skb_put(skb, 2);
254 put_unaligned_le16(sta->sta.aid, pos);
256 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
257 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
258 mesh_add_rsn_ie(sdata, skb) ||
259 mesh_add_meshid_ie(sdata, skb) ||
260 mesh_add_meshconf_ie(sdata, skb))
262 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
263 info->flags |= IEEE80211_TX_CTL_NO_ACK;
264 if (mesh_add_meshid_ie(sdata, skb))
268 /* Add Mesh Peering Management element */
270 case WLAN_SP_MESH_PEERING_OPEN:
272 case WLAN_SP_MESH_PEERING_CONFIRM:
276 case WLAN_SP_MESH_PEERING_CLOSE:
281 ie_len += 2; /* reason code */
288 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
291 pos = skb_put(skb, 2 + ie_len);
292 *pos++ = WLAN_EID_PEER_MGMT;
294 memcpy(pos, &peering_proto, 2);
296 put_unaligned_le16(llid, pos);
299 put_unaligned_le16(plid, pos);
302 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
303 put_unaligned_le16(reason, pos);
307 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
308 if (mesh_add_ht_cap_ie(sdata, skb) ||
309 mesh_add_ht_oper_ie(sdata, skb))
313 if (mesh_add_vendor_ies(sdata, skb))
316 ieee80211_tx_skb(sdata, skb);
324 * __mesh_plink_deactivate - deactivate mesh peer link
326 * @sta: mesh peer link to deactivate
328 * All mesh paths with this peer as next hop will be flushed
329 * Returns beacon changed flag if the beacon content changed.
331 * Locking: the caller must hold sta->mesh->plink_lock
333 static u32 __mesh_plink_deactivate(struct sta_info *sta)
335 struct ieee80211_sub_if_data *sdata = sta->sdata;
338 lockdep_assert_held(&sta->mesh->plink_lock);
340 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
341 changed = mesh_plink_dec_estab_count(sdata);
342 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
343 mesh_path_flush_by_nexthop(sta);
345 ieee80211_mps_sta_status_update(sta);
346 changed |= ieee80211_mps_set_sta_local_pm(sta,
347 NL80211_MESH_POWER_UNKNOWN);
353 * mesh_plink_deactivate - deactivate mesh peer link
355 * @sta: mesh peer link to deactivate
357 * All mesh paths with this peer as next hop will be flushed
359 u32 mesh_plink_deactivate(struct sta_info *sta)
361 struct ieee80211_sub_if_data *sdata = sta->sdata;
364 spin_lock_bh(&sta->mesh->plink_lock);
365 changed = __mesh_plink_deactivate(sta);
366 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
367 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
368 sta->sta.addr, sta->mesh->llid, sta->mesh->plid,
370 spin_unlock_bh(&sta->mesh->plink_lock);
375 static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
376 struct sta_info *sta,
377 struct ieee802_11_elems *elems, bool insert)
379 struct ieee80211_local *local = sdata->local;
380 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
381 struct ieee80211_supported_band *sband;
382 u32 rates, basic_rates = 0, changed = 0;
383 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
385 sband = local->hw.wiphy->bands[band];
386 rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates);
388 spin_lock_bh(&sta->mesh->plink_lock);
389 sta->last_rx = jiffies;
391 /* rates and capabilities don't change during peering */
392 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
393 sta->mesh->processed_beacon)
395 sta->mesh->processed_beacon = true;
397 if (sta->sta.supp_rates[band] != rates)
398 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
399 sta->sta.supp_rates[band] = rates;
401 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
402 elems->ht_cap_elem, sta))
403 changed |= IEEE80211_RC_BW_CHANGED;
405 if (bw != sta->sta.bandwidth)
406 changed |= IEEE80211_RC_BW_CHANGED;
408 /* HT peer is operating 20MHz-only */
409 if (elems->ht_operation &&
410 !(elems->ht_operation->ht_param &
411 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
412 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
413 changed |= IEEE80211_RC_BW_CHANGED;
414 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
418 rate_control_rate_init(sta);
420 rate_control_rate_update(local, sband, sta, changed);
422 spin_unlock_bh(&sta->mesh->plink_lock);
425 static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
427 struct sta_info *sta;
428 unsigned long *aid_map;
431 aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
432 sizeof(*aid_map), GFP_KERNEL);
436 /* reserve aid 0 for mcast indication */
437 __set_bit(0, aid_map);
440 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
441 __set_bit(sta->sta.aid, aid_map);
444 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
447 if (aid > IEEE80211_MAX_AID)
453 static struct sta_info *
454 __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
456 struct sta_info *sta;
459 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
462 aid = mesh_allocate_aid(sdata);
466 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
470 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
474 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
475 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
476 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
481 static struct sta_info *
482 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
483 struct ieee802_11_elems *elems)
485 struct sta_info *sta = NULL;
487 /* Userspace handles station allocation */
488 if (sdata->u.mesh.user_mpm ||
489 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
490 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
495 sta = __mesh_sta_info_alloc(sdata, addr);
501 * mesh_sta_info_get - return mesh sta info entry for @addr.
503 * @sdata: local meshif
504 * @addr: peer's address
505 * @elems: IEs from beacon or mesh peering frame.
507 * Return existing or newly allocated sta_info under RCU read lock.
508 * (re)initialize with given IEs.
510 static struct sta_info *
511 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
512 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
514 struct sta_info *sta = NULL;
517 sta = sta_info_get(sdata, addr);
519 mesh_sta_info_init(sdata, sta, elems, false);
522 /* can't run atomic */
523 sta = mesh_sta_info_alloc(sdata, addr, elems);
529 mesh_sta_info_init(sdata, sta, elems, true);
531 if (sta_info_insert_rcu(sta))
539 * mesh_neighbour_update - update or initialize new mesh neighbor.
541 * @sdata: local meshif
542 * @addr: peer's address
543 * @elems: IEs from beacon or mesh peering frame
545 * Initiates peering if appropriate.
547 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
549 struct ieee802_11_elems *elems)
551 struct sta_info *sta;
554 sta = mesh_sta_info_get(sdata, hw_addr, elems);
558 if (mesh_peer_accepts_plinks(elems) &&
559 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
560 sdata->u.mesh.accepting_plinks &&
561 sdata->u.mesh.mshcfg.auto_open_plinks &&
562 rssi_threshold_check(sdata, sta))
563 changed = mesh_plink_open(sta);
565 ieee80211_mps_frame_release(sta, elems);
568 ieee80211_mbss_info_change_notify(sdata, changed);
571 static void mesh_plink_timer(unsigned long data)
573 struct sta_info *sta;
575 struct ieee80211_sub_if_data *sdata;
576 struct mesh_config *mshcfg;
577 enum ieee80211_self_protected_actioncode action = 0;
580 * This STA is valid because sta_info_destroy() will
581 * del_timer_sync() this timer after having made sure
582 * it cannot be readded (by deleting the plink.)
584 sta = (struct sta_info *) data;
586 if (sta->sdata->local->quiescing)
589 spin_lock_bh(&sta->mesh->plink_lock);
591 /* If a timer fires just before a state transition on another CPU,
592 * we may have already extended the timeout and changed state by the
593 * time we've acquired the lock and arrived here. In that case,
594 * skip this timer and wait for the new one.
596 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
598 "Ignoring timer for %pM in state %s (timer adjusted)",
599 sta->sta.addr, mplstates[sta->mesh->plink_state]);
600 spin_unlock_bh(&sta->mesh->plink_lock);
604 /* del_timer() and handler may race when entering these states */
605 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
606 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
608 "Ignoring timer for %pM in state %s (timer deleted)",
609 sta->sta.addr, mplstates[sta->mesh->plink_state]);
610 spin_unlock_bh(&sta->mesh->plink_lock);
615 "Mesh plink timer for %pM fired on state %s\n",
616 sta->sta.addr, mplstates[sta->mesh->plink_state]);
618 mshcfg = &sdata->u.mesh.mshcfg;
620 switch (sta->mesh->plink_state) {
621 case NL80211_PLINK_OPN_RCVD:
622 case NL80211_PLINK_OPN_SNT:
624 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
627 "Mesh plink for %pM (retry, timeout): %d %d\n",
628 sta->sta.addr, sta->mesh->plink_retries,
629 sta->mesh->plink_timeout);
630 get_random_bytes(&rand, sizeof(u32));
631 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
632 rand % sta->mesh->plink_timeout;
633 ++sta->mesh->plink_retries;
634 mod_plink_timer(sta, sta->mesh->plink_timeout);
635 action = WLAN_SP_MESH_PEERING_OPEN;
638 reason = WLAN_REASON_MESH_MAX_RETRIES;
639 /* fall through on else */
640 case NL80211_PLINK_CNF_RCVD:
643 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
644 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
645 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
646 action = WLAN_SP_MESH_PEERING_CLOSE;
648 case NL80211_PLINK_HOLDING:
650 del_timer(&sta->mesh->plink_timer);
651 mesh_plink_fsm_restart(sta);
656 spin_unlock_bh(&sta->mesh->plink_lock);
658 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
659 sta->mesh->llid, sta->mesh->plid, reason);
662 static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
664 sta->mesh->plink_timer.expires = jiffies + msecs_to_jiffies(timeout);
665 sta->mesh->plink_timer.data = (unsigned long) sta;
666 sta->mesh->plink_timer.function = mesh_plink_timer;
667 sta->mesh->plink_timeout = timeout;
668 add_timer(&sta->mesh->plink_timer);
671 static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
674 struct ieee80211_local *local = sdata->local;
676 struct sta_info *sta;
679 list_for_each_entry_rcu(sta, &local->sta_list, list) {
680 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
690 static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
695 get_random_bytes(&llid, sizeof(llid));
696 } while (llid_in_use(sdata, llid));
701 u32 mesh_plink_open(struct sta_info *sta)
703 struct ieee80211_sub_if_data *sdata = sta->sdata;
706 if (!test_sta_flag(sta, WLAN_STA_AUTH))
709 spin_lock_bh(&sta->mesh->plink_lock);
710 sta->mesh->llid = mesh_get_new_llid(sdata);
711 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
712 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
713 spin_unlock_bh(&sta->mesh->plink_lock);
716 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
717 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
718 spin_unlock_bh(&sta->mesh->plink_lock);
720 "Mesh plink: starting establishment with %pM\n",
723 /* set the non-peer mode to active during peering */
724 changed = ieee80211_mps_local_status_update(sdata);
726 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
727 sta->sta.addr, sta->mesh->llid, 0, 0);
731 u32 mesh_plink_block(struct sta_info *sta)
735 spin_lock_bh(&sta->mesh->plink_lock);
736 changed = __mesh_plink_deactivate(sta);
737 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
738 spin_unlock_bh(&sta->mesh->plink_lock);
743 static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
744 struct sta_info *sta,
745 enum plink_event event)
747 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
748 u16 reason = (event == CLS_ACPT) ?
749 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
751 sta->mesh->reason = reason;
752 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
753 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
756 static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
757 struct sta_info *sta)
759 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
762 del_timer(&sta->mesh->plink_timer);
763 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
764 changed |= mesh_plink_inc_estab_count(sdata);
765 changed |= mesh_set_ht_prot_mode(sdata);
766 changed |= mesh_set_short_slot_time(sdata);
767 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
768 ieee80211_mps_sta_status_update(sta);
769 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
774 * mesh_plink_fsm - step @sta MPM based on @event
777 * @sta: mesh neighbor
778 * @event: peering event
780 * Return: changed MBSS flags
782 static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
783 struct sta_info *sta, enum plink_event event)
785 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
786 enum ieee80211_self_protected_actioncode action = 0;
789 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
790 mplstates[sta->mesh->plink_state], mplevents[event]);
792 spin_lock_bh(&sta->mesh->plink_lock);
793 switch (sta->mesh->plink_state) {
794 case NL80211_PLINK_LISTEN:
797 mesh_plink_fsm_restart(sta);
800 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
801 sta->mesh->llid = mesh_get_new_llid(sdata);
802 mesh_plink_timer_set(sta,
803 mshcfg->dot11MeshRetryTimeout);
805 /* set the non-peer mode to active during peering */
806 changed |= ieee80211_mps_local_status_update(sdata);
807 action = WLAN_SP_MESH_PEERING_OPEN;
813 case NL80211_PLINK_OPN_SNT:
818 mesh_plink_close(sdata, sta, event);
819 action = WLAN_SP_MESH_PEERING_CLOSE;
822 /* retry timer is left untouched */
823 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
824 action = WLAN_SP_MESH_PEERING_CONFIRM;
827 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
828 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
834 case NL80211_PLINK_OPN_RCVD:
839 mesh_plink_close(sdata, sta, event);
840 action = WLAN_SP_MESH_PEERING_CLOSE;
843 action = WLAN_SP_MESH_PEERING_CONFIRM;
846 changed |= mesh_plink_establish(sdata, sta);
852 case NL80211_PLINK_CNF_RCVD:
857 mesh_plink_close(sdata, sta, event);
858 action = WLAN_SP_MESH_PEERING_CLOSE;
861 changed |= mesh_plink_establish(sdata, sta);
862 action = WLAN_SP_MESH_PEERING_CONFIRM;
868 case NL80211_PLINK_ESTAB:
871 changed |= __mesh_plink_deactivate(sta);
872 changed |= mesh_set_ht_prot_mode(sdata);
873 changed |= mesh_set_short_slot_time(sdata);
874 mesh_plink_close(sdata, sta, event);
875 action = WLAN_SP_MESH_PEERING_CLOSE;
878 action = WLAN_SP_MESH_PEERING_CONFIRM;
884 case NL80211_PLINK_HOLDING:
887 del_timer(&sta->mesh->plink_timer);
888 mesh_plink_fsm_restart(sta);
894 action = WLAN_SP_MESH_PEERING_CLOSE;
901 /* should not get here, PLINK_BLOCKED is dealt with at the
902 * beginning of the function
906 spin_unlock_bh(&sta->mesh->plink_lock);
908 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
909 sta->mesh->llid, sta->mesh->plid,
912 /* also send confirm in open case */
913 if (action == WLAN_SP_MESH_PEERING_OPEN) {
914 mesh_plink_frame_tx(sdata, sta,
915 WLAN_SP_MESH_PEERING_CONFIRM,
916 sta->sta.addr, sta->mesh->llid,
925 * mesh_plink_get_event - get correct MPM event
928 * @sta: peer, leave NULL if processing a frame from a new suitable peer
929 * @elems: peering management IEs
931 * @llid: peer's peer link ID
932 * @plid: peer's local link ID
934 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
937 static enum plink_event
938 mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
939 struct sta_info *sta,
940 struct ieee802_11_elems *elems,
941 enum ieee80211_self_protected_actioncode ftype,
944 enum plink_event event = PLINK_UNDEFINED;
945 u8 ie_len = elems->peering_len;
948 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
949 mesh_matches_local(sdata, elems));
951 /* deny open request from non-matching peer */
952 if (!matches_local && !sta) {
958 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
959 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
962 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
963 if (!mesh_plink_free_count(sdata)) {
964 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
968 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
969 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
972 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
976 /* new matching peer */
983 case WLAN_SP_MESH_PEERING_OPEN:
986 if (!mesh_plink_free_count(sdata) ||
987 (sta->mesh->plid && sta->mesh->plid != plid))
992 case WLAN_SP_MESH_PEERING_CONFIRM:
995 if (!mesh_plink_free_count(sdata) ||
996 sta->mesh->llid != llid ||
997 (sta->mesh->plid && sta->mesh->plid != plid))
1002 case WLAN_SP_MESH_PEERING_CLOSE:
1003 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
1004 /* Do not check for llid or plid. This does not
1005 * follow the standard but since multiple plinks
1006 * per sta are not supported, it is necessary in
1007 * order to avoid a livelock when MP A sees an
1008 * establish peer link to MP B but MP B does not
1009 * see it. This can be caused by a timeout in
1010 * B's peer link establishment or B beign
1014 else if (sta->mesh->plid != plid)
1016 else if (ie_len == 8 && sta->mesh->llid != llid)
1022 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1031 mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1032 struct ieee80211_mgmt *mgmt,
1033 struct ieee802_11_elems *elems)
1036 struct sta_info *sta;
1037 enum plink_event event;
1038 enum ieee80211_self_protected_actioncode ftype;
1040 u8 ie_len = elems->peering_len;
1043 if (!elems->peering) {
1045 "Mesh plink: missing necessary peer link ie\n");
1049 if (elems->rsn_len &&
1050 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1052 "Mesh plink: can't establish link with secure peer\n");
1056 ftype = mgmt->u.action.u.self_prot.action_code;
1057 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1058 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1059 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1062 "Mesh plink: incorrect plink ie length %d %d\n",
1067 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1068 (!elems->mesh_id || !elems->mesh_config)) {
1069 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1072 /* Note the lines below are correct, the llid in the frame is the plid
1073 * from the point of view of this host.
1075 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
1076 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1077 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1078 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
1080 /* WARNING: Only for sta pointer, is dropped & re-acquired */
1083 sta = sta_info_get(sdata, mgmt->sa);
1085 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1086 !rssi_threshold_check(sdata, sta)) {
1087 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1092 /* Now we will figure out the appropriate event... */
1093 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1095 if (event == OPN_ACPT) {
1097 /* allocate sta entry if necessary and update info */
1098 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
1100 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1103 sta->mesh->plid = plid;
1104 } else if (!sta && event == OPN_RJCT) {
1105 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
1107 WLAN_REASON_MESH_CONFIG);
1109 } else if (!sta || event == PLINK_UNDEFINED) {
1110 /* something went wrong */
1114 if (event == CNF_ACPT) {
1115 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1116 if (!sta->mesh->plid)
1117 sta->mesh->plid = plid;
1119 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1122 changed |= mesh_plink_fsm(sdata, sta, event);
1128 ieee80211_mbss_info_change_notify(sdata, changed);
1131 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1132 struct ieee80211_mgmt *mgmt, size_t len,
1133 struct ieee80211_rx_status *rx_status)
1135 struct ieee802_11_elems elems;
1139 /* need action_code, aux */
1140 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1143 if (sdata->u.mesh.user_mpm)
1144 /* userspace must register for these */
1147 if (is_multicast_ether_addr(mgmt->da)) {
1149 "Mesh plink: ignore frame from multicast address\n");
1153 baseaddr = mgmt->u.action.u.self_prot.variable;
1154 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1155 if (mgmt->u.action.u.self_prot.action_code ==
1156 WLAN_SP_MESH_PEERING_CONFIRM) {
1163 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1164 mesh_process_plink_frame(sdata, mgmt, &elems);