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 + msecs_to_jiffies(t)))
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->plink_lock
77 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
79 lockdep_assert_held(&sta->plink_lock);
80 sta->plink_state = NL80211_PLINK_LISTEN;
81 sta->llid = sta->plid = sta->reason = 0;
82 sta->plink_retries = 0;
86 * mesh_set_short_slot_time - enable / disable ERP short slot time.
88 * The standard indirectly mandates mesh STAs to turn off short slot time by
89 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
90 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
91 * MBSS support ERP rates.
93 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
95 static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
97 struct ieee80211_local *local = sdata->local;
98 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
99 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
100 struct sta_info *sta;
101 u32 erp_rates = 0, changed = 0;
103 bool short_slot = false;
105 if (band == IEEE80211_BAND_5GHZ) {
106 /* (IEEE 802.11-2012 19.4.5) */
109 } else if (band != IEEE80211_BAND_2GHZ)
112 for (i = 0; i < sband->n_bitrates; i++)
113 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
120 list_for_each_entry_rcu(sta, &local->sta_list, list) {
121 if (sdata != sta->sdata ||
122 sta->plink_state != NL80211_PLINK_ESTAB)
126 if (erp_rates & sta->sta.supp_rates[band])
134 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
135 sdata->vif.bss_conf.use_short_slot = short_slot;
136 changed = BSS_CHANGED_ERP_SLOT;
137 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
138 sdata->vif.addr, short_slot);
144 * mesh_set_ht_prot_mode - set correct HT protection mode
146 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
147 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
148 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
149 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
150 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
151 * HT20 peer is present. Otherwise no-protection mode is selected.
153 static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
155 struct ieee80211_local *local = sdata->local;
156 struct sta_info *sta;
158 bool non_ht_sta = false, ht20_sta = false;
160 switch (sdata->vif.bss_conf.chandef.width) {
161 case NL80211_CHAN_WIDTH_20_NOHT:
162 case NL80211_CHAN_WIDTH_5:
163 case NL80211_CHAN_WIDTH_10:
170 list_for_each_entry_rcu(sta, &local->sta_list, list) {
171 if (sdata != sta->sdata ||
172 sta->plink_state != NL80211_PLINK_ESTAB)
175 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
178 if (!sta->sta.ht_cap.ht_supported) {
179 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
185 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
191 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
193 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
194 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
196 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
198 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
201 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
202 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
203 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
204 return BSS_CHANGED_HT;
208 * __mesh_plink_deactivate - deactivate mesh peer link
210 * @sta: mesh peer link to deactivate
212 * All mesh paths with this peer as next hop will be flushed
213 * Returns beacon changed flag if the beacon content changed.
215 * Locking: the caller must hold sta->plink_lock
217 static u32 __mesh_plink_deactivate(struct sta_info *sta)
219 struct ieee80211_sub_if_data *sdata = sta->sdata;
222 lockdep_assert_held(&sta->plink_lock);
224 if (sta->plink_state == NL80211_PLINK_ESTAB)
225 changed = mesh_plink_dec_estab_count(sdata);
226 sta->plink_state = NL80211_PLINK_BLOCKED;
227 mesh_path_flush_by_nexthop(sta);
229 ieee80211_mps_sta_status_update(sta);
230 changed |= ieee80211_mps_set_sta_local_pm(sta,
231 NL80211_MESH_POWER_UNKNOWN);
237 * mesh_plink_deactivate - deactivate mesh peer link
239 * @sta: mesh peer link to deactivate
241 * All mesh paths with this peer as next hop will be flushed
243 u32 mesh_plink_deactivate(struct sta_info *sta)
245 struct ieee80211_sub_if_data *sdata = sta->sdata;
248 spin_lock_bh(&sta->plink_lock);
249 changed = __mesh_plink_deactivate(sta);
250 sta->reason = WLAN_REASON_MESH_PEER_CANCELED;
251 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
252 sta->sta.addr, sta->llid, sta->plid,
254 spin_unlock_bh(&sta->plink_lock);
259 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
260 enum ieee80211_self_protected_actioncode action,
261 u8 *da, u16 llid, u16 plid, u16 reason)
263 struct ieee80211_local *local = sdata->local;
265 struct ieee80211_tx_info *info;
266 struct ieee80211_mgmt *mgmt;
267 bool include_plid = false;
268 u16 peering_proto = 0;
270 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
271 sizeof(mgmt->u.action.u.self_prot);
274 skb = dev_alloc_skb(local->tx_headroom +
276 2 + /* capability info */
278 2 + 8 + /* supported rates */
279 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
280 2 + sdata->u.mesh.mesh_id_len +
281 2 + sizeof(struct ieee80211_meshconf_ie) +
282 2 + sizeof(struct ieee80211_ht_cap) +
283 2 + sizeof(struct ieee80211_ht_operation) +
284 2 + 8 + /* peering IE */
285 sdata->u.mesh.ie_len);
288 info = IEEE80211_SKB_CB(skb);
289 skb_reserve(skb, local->tx_headroom);
290 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
291 memset(mgmt, 0, hdr_len);
292 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
293 IEEE80211_STYPE_ACTION);
294 memcpy(mgmt->da, da, ETH_ALEN);
295 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
296 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
297 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
298 mgmt->u.action.u.self_prot.action_code = action;
300 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
301 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
303 /* capability info */
304 pos = skb_put(skb, 2);
306 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
308 pos = skb_put(skb, 2);
309 put_unaligned_le16(plid, pos + 2);
311 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
312 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
313 mesh_add_rsn_ie(sdata, skb) ||
314 mesh_add_meshid_ie(sdata, skb) ||
315 mesh_add_meshconf_ie(sdata, skb))
317 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
318 info->flags |= IEEE80211_TX_CTL_NO_ACK;
319 if (mesh_add_meshid_ie(sdata, skb))
323 /* Add Mesh Peering Management element */
325 case WLAN_SP_MESH_PEERING_OPEN:
327 case WLAN_SP_MESH_PEERING_CONFIRM:
331 case WLAN_SP_MESH_PEERING_CLOSE:
336 ie_len += 2; /* reason code */
343 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
346 pos = skb_put(skb, 2 + ie_len);
347 *pos++ = WLAN_EID_PEER_MGMT;
349 memcpy(pos, &peering_proto, 2);
351 put_unaligned_le16(llid, pos);
354 put_unaligned_le16(plid, pos);
357 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
358 put_unaligned_le16(reason, pos);
362 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
363 if (mesh_add_ht_cap_ie(sdata, skb) ||
364 mesh_add_ht_oper_ie(sdata, skb))
368 if (mesh_add_vendor_ies(sdata, skb))
371 ieee80211_tx_skb(sdata, skb);
378 static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
379 struct sta_info *sta,
380 struct ieee802_11_elems *elems, bool insert)
382 struct ieee80211_local *local = sdata->local;
383 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
384 struct ieee80211_supported_band *sband;
385 u32 rates, basic_rates = 0, changed = 0;
386 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
388 sband = local->hw.wiphy->bands[band];
389 rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates);
391 spin_lock_bh(&sta->plink_lock);
392 sta->last_rx = jiffies;
394 /* rates and capabilities don't change during peering */
395 if (sta->plink_state == NL80211_PLINK_ESTAB && sta->processed_beacon)
397 sta->processed_beacon = true;
399 if (sta->sta.supp_rates[band] != rates)
400 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
401 sta->sta.supp_rates[band] = rates;
403 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
404 elems->ht_cap_elem, sta))
405 changed |= IEEE80211_RC_BW_CHANGED;
407 if (bw != sta->sta.bandwidth)
408 changed |= IEEE80211_RC_BW_CHANGED;
410 /* HT peer is operating 20MHz-only */
411 if (elems->ht_operation &&
412 !(elems->ht_operation->ht_param &
413 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
414 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
415 changed |= IEEE80211_RC_BW_CHANGED;
416 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
420 rate_control_rate_init(sta);
422 rate_control_rate_update(local, sband, sta, changed);
424 spin_unlock_bh(&sta->plink_lock);
427 static struct sta_info *
428 __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
430 struct sta_info *sta;
432 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
435 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
439 sta->plink_state = NL80211_PLINK_LISTEN;
442 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
443 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
444 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
449 static struct sta_info *
450 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
451 struct ieee802_11_elems *elems)
453 struct sta_info *sta = NULL;
455 /* Userspace handles station allocation */
456 if (sdata->u.mesh.user_mpm ||
457 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
458 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
463 sta = __mesh_sta_info_alloc(sdata, addr);
469 * mesh_sta_info_get - return mesh sta info entry for @addr.
471 * @sdata: local meshif
472 * @addr: peer's address
473 * @elems: IEs from beacon or mesh peering frame.
475 * Return existing or newly allocated sta_info under RCU read lock.
476 * (re)initialize with given IEs.
478 static struct sta_info *
479 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
480 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
482 struct sta_info *sta = NULL;
485 sta = sta_info_get(sdata, addr);
487 mesh_sta_info_init(sdata, sta, elems, false);
490 /* can't run atomic */
491 sta = mesh_sta_info_alloc(sdata, addr, elems);
497 mesh_sta_info_init(sdata, sta, elems, true);
499 if (sta_info_insert_rcu(sta))
507 * mesh_neighbour_update - update or initialize new mesh neighbor.
509 * @sdata: local meshif
510 * @addr: peer's address
511 * @elems: IEs from beacon or mesh peering frame
513 * Initiates peering if appropriate.
515 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
517 struct ieee802_11_elems *elems)
519 struct sta_info *sta;
522 sta = mesh_sta_info_get(sdata, hw_addr, elems);
526 if (mesh_peer_accepts_plinks(elems) &&
527 sta->plink_state == NL80211_PLINK_LISTEN &&
528 sdata->u.mesh.accepting_plinks &&
529 sdata->u.mesh.mshcfg.auto_open_plinks &&
530 rssi_threshold_check(sdata, sta))
531 changed = mesh_plink_open(sta);
533 ieee80211_mps_frame_release(sta, elems);
536 ieee80211_mbss_info_change_notify(sdata, changed);
539 static void mesh_plink_timer(unsigned long data)
541 struct sta_info *sta;
543 struct ieee80211_sub_if_data *sdata;
544 struct mesh_config *mshcfg;
545 enum ieee80211_self_protected_actioncode action = 0;
548 * This STA is valid because sta_info_destroy() will
549 * del_timer_sync() this timer after having made sure
550 * it cannot be readded (by deleting the plink.)
552 sta = (struct sta_info *) data;
554 if (sta->sdata->local->quiescing)
557 spin_lock_bh(&sta->plink_lock);
559 /* If a timer fires just before a state transition on another CPU,
560 * we may have already extended the timeout and changed state by the
561 * time we've acquired the lock and arrived here. In that case,
562 * skip this timer and wait for the new one.
564 if (time_before(jiffies, sta->plink_timer.expires)) {
566 "Ignoring timer for %pM in state %s (timer adjusted)",
567 sta->sta.addr, mplstates[sta->plink_state]);
568 spin_unlock_bh(&sta->plink_lock);
572 /* del_timer() and handler may race when entering these states */
573 if (sta->plink_state == NL80211_PLINK_LISTEN ||
574 sta->plink_state == NL80211_PLINK_ESTAB) {
576 "Ignoring timer for %pM in state %s (timer deleted)",
577 sta->sta.addr, mplstates[sta->plink_state]);
578 spin_unlock_bh(&sta->plink_lock);
583 "Mesh plink timer for %pM fired on state %s\n",
584 sta->sta.addr, mplstates[sta->plink_state]);
586 mshcfg = &sdata->u.mesh.mshcfg;
588 switch (sta->plink_state) {
589 case NL80211_PLINK_OPN_RCVD:
590 case NL80211_PLINK_OPN_SNT:
592 if (sta->plink_retries < mshcfg->dot11MeshMaxRetries) {
595 "Mesh plink for %pM (retry, timeout): %d %d\n",
596 sta->sta.addr, sta->plink_retries,
598 get_random_bytes(&rand, sizeof(u32));
599 sta->plink_timeout = sta->plink_timeout +
600 rand % sta->plink_timeout;
601 ++sta->plink_retries;
602 mod_plink_timer(sta, sta->plink_timeout);
603 action = WLAN_SP_MESH_PEERING_OPEN;
606 reason = WLAN_REASON_MESH_MAX_RETRIES;
607 /* fall through on else */
608 case NL80211_PLINK_CNF_RCVD:
611 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
612 sta->plink_state = NL80211_PLINK_HOLDING;
613 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
614 action = WLAN_SP_MESH_PEERING_CLOSE;
616 case NL80211_PLINK_HOLDING:
618 del_timer(&sta->plink_timer);
619 mesh_plink_fsm_restart(sta);
624 spin_unlock_bh(&sta->plink_lock);
626 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
627 sta->llid, sta->plid, reason);
630 static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
632 sta->plink_timer.expires = jiffies + msecs_to_jiffies(timeout);
633 sta->plink_timer.data = (unsigned long) sta;
634 sta->plink_timer.function = mesh_plink_timer;
635 sta->plink_timeout = timeout;
636 add_timer(&sta->plink_timer);
639 static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
642 struct ieee80211_local *local = sdata->local;
644 struct sta_info *sta;
647 list_for_each_entry_rcu(sta, &local->sta_list, list) {
648 if (!memcmp(&sta->llid, &llid, sizeof(llid))) {
658 static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
663 get_random_bytes(&llid, sizeof(llid));
664 /* for mesh PS we still only have the AID range for TIM bits */
665 llid = (llid % IEEE80211_MAX_AID) + 1;
666 } while (llid_in_use(sdata, llid));
671 u32 mesh_plink_open(struct sta_info *sta)
673 struct ieee80211_sub_if_data *sdata = sta->sdata;
676 if (!test_sta_flag(sta, WLAN_STA_AUTH))
679 spin_lock_bh(&sta->plink_lock);
680 sta->llid = mesh_get_new_llid(sdata);
681 if (sta->plink_state != NL80211_PLINK_LISTEN &&
682 sta->plink_state != NL80211_PLINK_BLOCKED) {
683 spin_unlock_bh(&sta->plink_lock);
686 sta->plink_state = NL80211_PLINK_OPN_SNT;
687 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
688 spin_unlock_bh(&sta->plink_lock);
690 "Mesh plink: starting establishment with %pM\n",
693 /* set the non-peer mode to active during peering */
694 changed = ieee80211_mps_local_status_update(sdata);
696 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
697 sta->sta.addr, sta->llid, 0, 0);
701 u32 mesh_plink_block(struct sta_info *sta)
705 spin_lock_bh(&sta->plink_lock);
706 changed = __mesh_plink_deactivate(sta);
707 sta->plink_state = NL80211_PLINK_BLOCKED;
708 spin_unlock_bh(&sta->plink_lock);
713 static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
714 struct sta_info *sta,
715 enum plink_event event)
717 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
719 u16 reason = (event == CLS_ACPT) ?
720 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
722 sta->reason = reason;
723 sta->plink_state = NL80211_PLINK_HOLDING;
724 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
727 static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
728 struct sta_info *sta)
730 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
733 del_timer(&sta->plink_timer);
734 sta->plink_state = NL80211_PLINK_ESTAB;
735 changed |= mesh_plink_inc_estab_count(sdata);
736 changed |= mesh_set_ht_prot_mode(sdata);
737 changed |= mesh_set_short_slot_time(sdata);
738 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
739 ieee80211_mps_sta_status_update(sta);
740 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
745 * mesh_plink_fsm - step @sta MPM based on @event
748 * @sta: mesh neighbor
749 * @event: peering event
751 * Return: changed MBSS flags
753 static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
754 struct sta_info *sta, enum plink_event event)
756 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
757 enum ieee80211_self_protected_actioncode action = 0;
760 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
761 mplstates[sta->plink_state], mplevents[event]);
763 spin_lock_bh(&sta->plink_lock);
764 switch (sta->plink_state) {
765 case NL80211_PLINK_LISTEN:
768 mesh_plink_fsm_restart(sta);
771 sta->plink_state = NL80211_PLINK_OPN_RCVD;
772 sta->llid = mesh_get_new_llid(sdata);
773 mesh_plink_timer_set(sta,
774 mshcfg->dot11MeshRetryTimeout);
776 /* set the non-peer mode to active during peering */
777 changed |= ieee80211_mps_local_status_update(sdata);
778 action = WLAN_SP_MESH_PEERING_OPEN;
784 case NL80211_PLINK_OPN_SNT:
789 mesh_plink_close(sdata, sta, event);
790 action = WLAN_SP_MESH_PEERING_CLOSE;
793 /* retry timer is left untouched */
794 sta->plink_state = NL80211_PLINK_OPN_RCVD;
795 action = WLAN_SP_MESH_PEERING_CONFIRM;
798 sta->plink_state = NL80211_PLINK_CNF_RCVD;
799 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
805 case NL80211_PLINK_OPN_RCVD:
810 mesh_plink_close(sdata, sta, event);
811 action = WLAN_SP_MESH_PEERING_CLOSE;
814 action = WLAN_SP_MESH_PEERING_CONFIRM;
817 changed |= mesh_plink_establish(sdata, sta);
823 case NL80211_PLINK_CNF_RCVD:
828 mesh_plink_close(sdata, sta, event);
829 action = WLAN_SP_MESH_PEERING_CLOSE;
832 changed |= mesh_plink_establish(sdata, sta);
833 action = WLAN_SP_MESH_PEERING_CONFIRM;
839 case NL80211_PLINK_ESTAB:
842 changed |= __mesh_plink_deactivate(sta);
843 changed |= mesh_set_ht_prot_mode(sdata);
844 changed |= mesh_set_short_slot_time(sdata);
845 mesh_plink_close(sdata, sta, event);
846 action = WLAN_SP_MESH_PEERING_CLOSE;
849 action = WLAN_SP_MESH_PEERING_CONFIRM;
855 case NL80211_PLINK_HOLDING:
858 del_timer(&sta->plink_timer);
859 mesh_plink_fsm_restart(sta);
865 action = WLAN_SP_MESH_PEERING_CLOSE;
872 /* should not get here, PLINK_BLOCKED is dealt with at the
873 * beginning of the function
877 spin_unlock_bh(&sta->plink_lock);
879 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
880 sta->llid, sta->plid, sta->reason);
882 /* also send confirm in open case */
883 if (action == WLAN_SP_MESH_PEERING_OPEN) {
884 mesh_plink_frame_tx(sdata,
885 WLAN_SP_MESH_PEERING_CONFIRM,
886 sta->sta.addr, sta->llid,
895 * mesh_plink_get_event - get correct MPM event
898 * @sta: peer, leave NULL if processing a frame from a new suitable peer
899 * @elems: peering management IEs
901 * @llid: peer's peer link ID
902 * @plid: peer's local link ID
904 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
907 static enum plink_event
908 mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
909 struct sta_info *sta,
910 struct ieee802_11_elems *elems,
911 enum ieee80211_self_protected_actioncode ftype,
914 enum plink_event event = PLINK_UNDEFINED;
915 u8 ie_len = elems->peering_len;
918 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
919 mesh_matches_local(sdata, elems));
921 /* deny open request from non-matching peer */
922 if (!matches_local && !sta) {
928 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
929 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
932 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
933 if (!mesh_plink_free_count(sdata)) {
934 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
938 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
939 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
942 if (sta->plink_state == NL80211_PLINK_BLOCKED)
946 /* new matching peer */
953 case WLAN_SP_MESH_PEERING_OPEN:
956 if (!mesh_plink_free_count(sdata) ||
957 (sta->plid && sta->plid != plid))
962 case WLAN_SP_MESH_PEERING_CONFIRM:
965 if (!mesh_plink_free_count(sdata) ||
967 (sta->plid && sta->plid != plid))
972 case WLAN_SP_MESH_PEERING_CLOSE:
973 if (sta->plink_state == NL80211_PLINK_ESTAB)
974 /* Do not check for llid or plid. This does not
975 * follow the standard but since multiple plinks
976 * per sta are not supported, it is necessary in
977 * order to avoid a livelock when MP A sees an
978 * establish peer link to MP B but MP B does not
979 * see it. This can be caused by a timeout in
980 * B's peer link establishment or B beign
984 else if (sta->plid != plid)
986 else if (ie_len == 8 && sta->llid != llid)
992 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1001 mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1002 struct ieee80211_mgmt *mgmt,
1003 struct ieee802_11_elems *elems)
1006 struct sta_info *sta;
1007 enum plink_event event;
1008 enum ieee80211_self_protected_actioncode ftype;
1010 u8 ie_len = elems->peering_len;
1013 if (!elems->peering) {
1015 "Mesh plink: missing necessary peer link ie\n");
1019 if (elems->rsn_len &&
1020 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1022 "Mesh plink: can't establish link with secure peer\n");
1026 ftype = mgmt->u.action.u.self_prot.action_code;
1027 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1028 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1029 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1032 "Mesh plink: incorrect plink ie length %d %d\n",
1037 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1038 (!elems->mesh_id || !elems->mesh_config)) {
1039 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1042 /* Note the lines below are correct, the llid in the frame is the plid
1043 * from the point of view of this host.
1045 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
1046 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1047 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1048 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
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);