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;
436 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
437 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
438 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
443 static struct sta_info *
444 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
445 struct ieee802_11_elems *elems)
447 struct sta_info *sta = NULL;
449 /* Userspace handles station allocation */
450 if (sdata->u.mesh.user_mpm ||
451 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
452 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
457 sta = __mesh_sta_info_alloc(sdata, addr);
463 * mesh_sta_info_get - return mesh sta info entry for @addr.
465 * @sdata: local meshif
466 * @addr: peer's address
467 * @elems: IEs from beacon or mesh peering frame.
469 * Return existing or newly allocated sta_info under RCU read lock.
470 * (re)initialize with given IEs.
472 static struct sta_info *
473 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
474 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
476 struct sta_info *sta = NULL;
479 sta = sta_info_get(sdata, addr);
481 mesh_sta_info_init(sdata, sta, elems, false);
484 /* can't run atomic */
485 sta = mesh_sta_info_alloc(sdata, addr, elems);
491 mesh_sta_info_init(sdata, sta, elems, true);
493 if (sta_info_insert_rcu(sta))
501 * mesh_neighbour_update - update or initialize new mesh neighbor.
503 * @sdata: local meshif
504 * @addr: peer's address
505 * @elems: IEs from beacon or mesh peering frame
507 * Initiates peering if appropriate.
509 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
511 struct ieee802_11_elems *elems)
513 struct sta_info *sta;
516 sta = mesh_sta_info_get(sdata, hw_addr, elems);
520 if (mesh_peer_accepts_plinks(elems) &&
521 sta->plink_state == NL80211_PLINK_LISTEN &&
522 sdata->u.mesh.accepting_plinks &&
523 sdata->u.mesh.mshcfg.auto_open_plinks &&
524 rssi_threshold_check(sdata, sta))
525 changed = mesh_plink_open(sta);
527 ieee80211_mps_frame_release(sta, elems);
530 ieee80211_mbss_info_change_notify(sdata, changed);
533 static void mesh_plink_timer(unsigned long data)
535 struct sta_info *sta;
537 struct ieee80211_sub_if_data *sdata;
538 struct mesh_config *mshcfg;
539 enum ieee80211_self_protected_actioncode action = 0;
542 * This STA is valid because sta_info_destroy() will
543 * del_timer_sync() this timer after having made sure
544 * it cannot be readded (by deleting the plink.)
546 sta = (struct sta_info *) data;
548 if (sta->sdata->local->quiescing)
551 spin_lock_bh(&sta->lock);
553 /* If a timer fires just before a state transition on another CPU,
554 * we may have already extended the timeout and changed state by the
555 * time we've acquired the lock and arrived here. In that case,
556 * skip this timer and wait for the new one.
558 if (time_before(jiffies, sta->plink_timer.expires)) {
560 "Ignoring timer for %pM in state %s (timer adjusted)",
561 sta->sta.addr, mplstates[sta->plink_state]);
562 spin_unlock_bh(&sta->lock);
566 /* del_timer() and handler may race when entering these states */
567 if (sta->plink_state == NL80211_PLINK_LISTEN ||
568 sta->plink_state == NL80211_PLINK_ESTAB) {
570 "Ignoring timer for %pM in state %s (timer deleted)",
571 sta->sta.addr, mplstates[sta->plink_state]);
572 spin_unlock_bh(&sta->lock);
577 "Mesh plink timer for %pM fired on state %s\n",
578 sta->sta.addr, mplstates[sta->plink_state]);
580 mshcfg = &sdata->u.mesh.mshcfg;
582 switch (sta->plink_state) {
583 case NL80211_PLINK_OPN_RCVD:
584 case NL80211_PLINK_OPN_SNT:
586 if (sta->plink_retries < mshcfg->dot11MeshMaxRetries) {
589 "Mesh plink for %pM (retry, timeout): %d %d\n",
590 sta->sta.addr, sta->plink_retries,
592 get_random_bytes(&rand, sizeof(u32));
593 sta->plink_timeout = sta->plink_timeout +
594 rand % sta->plink_timeout;
595 ++sta->plink_retries;
596 mod_plink_timer(sta, sta->plink_timeout);
597 action = WLAN_SP_MESH_PEERING_OPEN;
600 reason = WLAN_REASON_MESH_MAX_RETRIES;
601 /* fall through on else */
602 case NL80211_PLINK_CNF_RCVD:
605 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
606 sta->plink_state = NL80211_PLINK_HOLDING;
607 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
608 action = WLAN_SP_MESH_PEERING_CLOSE;
610 case NL80211_PLINK_HOLDING:
612 del_timer(&sta->plink_timer);
613 mesh_plink_fsm_restart(sta);
618 spin_unlock_bh(&sta->lock);
620 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
621 sta->llid, sta->plid, reason);
624 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
626 sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
627 sta->plink_timer.data = (unsigned long) sta;
628 sta->plink_timer.function = mesh_plink_timer;
629 sta->plink_timeout = timeout;
630 add_timer(&sta->plink_timer);
633 static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
636 struct ieee80211_local *local = sdata->local;
638 struct sta_info *sta;
641 list_for_each_entry_rcu(sta, &local->sta_list, list) {
642 if (!memcmp(&sta->llid, &llid, sizeof(llid))) {
652 static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
657 get_random_bytes(&llid, sizeof(llid));
658 /* for mesh PS we still only have the AID range for TIM bits */
659 llid = (llid % IEEE80211_MAX_AID) + 1;
660 } while (llid_in_use(sdata, llid));
665 u32 mesh_plink_open(struct sta_info *sta)
667 struct ieee80211_sub_if_data *sdata = sta->sdata;
670 if (!test_sta_flag(sta, WLAN_STA_AUTH))
673 spin_lock_bh(&sta->lock);
674 sta->llid = mesh_get_new_llid(sdata);
675 if (sta->plink_state != NL80211_PLINK_LISTEN &&
676 sta->plink_state != NL80211_PLINK_BLOCKED) {
677 spin_unlock_bh(&sta->lock);
680 sta->plink_state = NL80211_PLINK_OPN_SNT;
681 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
682 spin_unlock_bh(&sta->lock);
684 "Mesh plink: starting establishment with %pM\n",
687 /* set the non-peer mode to active during peering */
688 changed = ieee80211_mps_local_status_update(sdata);
690 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
691 sta->sta.addr, sta->llid, 0, 0);
695 u32 mesh_plink_block(struct sta_info *sta)
699 spin_lock_bh(&sta->lock);
700 changed = __mesh_plink_deactivate(sta);
701 sta->plink_state = NL80211_PLINK_BLOCKED;
702 spin_unlock_bh(&sta->lock);
707 static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
708 struct sta_info *sta,
709 enum plink_event event)
711 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
713 u16 reason = (event == CLS_ACPT) ?
714 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
716 sta->reason = reason;
717 sta->plink_state = NL80211_PLINK_HOLDING;
718 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
721 static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
722 struct sta_info *sta)
724 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
727 del_timer(&sta->plink_timer);
728 sta->plink_state = NL80211_PLINK_ESTAB;
729 changed |= mesh_plink_inc_estab_count(sdata);
730 changed |= mesh_set_ht_prot_mode(sdata);
731 changed |= mesh_set_short_slot_time(sdata);
732 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
733 ieee80211_mps_sta_status_update(sta);
734 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
739 * mesh_plink_fsm - step @sta MPM based on @event
742 * @sta: mesh neighbor
743 * @event: peering event
745 * Return: changed MBSS flags
747 static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
748 struct sta_info *sta, enum plink_event event)
750 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
751 enum ieee80211_self_protected_actioncode action = 0;
754 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
755 mplstates[sta->plink_state], mplevents[event]);
757 spin_lock_bh(&sta->lock);
758 switch (sta->plink_state) {
759 case NL80211_PLINK_LISTEN:
762 mesh_plink_fsm_restart(sta);
765 sta->plink_state = NL80211_PLINK_OPN_RCVD;
766 sta->llid = mesh_get_new_llid(sdata);
767 mesh_plink_timer_set(sta,
768 mshcfg->dot11MeshRetryTimeout);
770 /* set the non-peer mode to active during peering */
771 changed |= ieee80211_mps_local_status_update(sdata);
772 action = WLAN_SP_MESH_PEERING_OPEN;
778 case NL80211_PLINK_OPN_SNT:
783 mesh_plink_close(sdata, sta, event);
784 action = WLAN_SP_MESH_PEERING_CLOSE;
787 /* retry timer is left untouched */
788 sta->plink_state = NL80211_PLINK_OPN_RCVD;
789 action = WLAN_SP_MESH_PEERING_CONFIRM;
792 sta->plink_state = NL80211_PLINK_CNF_RCVD;
793 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
799 case NL80211_PLINK_OPN_RCVD:
804 mesh_plink_close(sdata, sta, event);
805 action = WLAN_SP_MESH_PEERING_CLOSE;
808 action = WLAN_SP_MESH_PEERING_CONFIRM;
811 changed |= mesh_plink_establish(sdata, sta);
817 case NL80211_PLINK_CNF_RCVD:
822 mesh_plink_close(sdata, sta, event);
823 action = WLAN_SP_MESH_PEERING_CLOSE;
826 changed |= mesh_plink_establish(sdata, sta);
827 action = WLAN_SP_MESH_PEERING_CONFIRM;
833 case NL80211_PLINK_ESTAB:
836 changed |= __mesh_plink_deactivate(sta);
837 changed |= mesh_set_ht_prot_mode(sdata);
838 changed |= mesh_set_short_slot_time(sdata);
839 mesh_plink_close(sdata, sta, event);
840 action = WLAN_SP_MESH_PEERING_CLOSE;
843 action = WLAN_SP_MESH_PEERING_CONFIRM;
849 case NL80211_PLINK_HOLDING:
852 del_timer(&sta->plink_timer);
853 mesh_plink_fsm_restart(sta);
859 action = WLAN_SP_MESH_PEERING_CLOSE;
866 /* should not get here, PLINK_BLOCKED is dealt with at the
867 * beginning of the function
871 spin_unlock_bh(&sta->lock);
873 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
874 sta->llid, sta->plid, sta->reason);
876 /* also send confirm in open case */
877 if (action == WLAN_SP_MESH_PEERING_OPEN) {
878 mesh_plink_frame_tx(sdata,
879 WLAN_SP_MESH_PEERING_CONFIRM,
880 sta->sta.addr, sta->llid,
889 * mesh_plink_get_event - get correct MPM event
892 * @sta: peer, leave NULL if processing a frame from a new suitable peer
893 * @elems: peering management IEs
895 * @llid: peer's peer link ID
896 * @plid: peer's local link ID
898 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
901 static enum plink_event
902 mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
903 struct sta_info *sta,
904 struct ieee802_11_elems *elems,
905 enum ieee80211_self_protected_actioncode ftype,
908 enum plink_event event = PLINK_UNDEFINED;
909 u8 ie_len = elems->peering_len;
912 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
913 mesh_matches_local(sdata, elems));
915 /* deny open request from non-matching peer */
916 if (!matches_local && !sta) {
922 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
923 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
926 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
927 if (!mesh_plink_free_count(sdata)) {
928 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
932 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
933 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
936 if (sta->plink_state == NL80211_PLINK_BLOCKED)
940 /* new matching peer */
947 case WLAN_SP_MESH_PEERING_OPEN:
950 if (!mesh_plink_free_count(sdata) ||
951 (sta->plid && sta->plid != plid))
956 case WLAN_SP_MESH_PEERING_CONFIRM:
959 if (!mesh_plink_free_count(sdata) ||
961 (sta->plid && sta->plid != plid))
966 case WLAN_SP_MESH_PEERING_CLOSE:
967 if (sta->plink_state == NL80211_PLINK_ESTAB)
968 /* Do not check for llid or plid. This does not
969 * follow the standard but since multiple plinks
970 * per sta are not supported, it is necessary in
971 * order to avoid a livelock when MP A sees an
972 * establish peer link to MP B but MP B does not
973 * see it. This can be caused by a timeout in
974 * B's peer link establishment or B beign
978 else if (sta->plid != plid)
980 else if (ie_len == 8 && sta->llid != llid)
986 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
995 mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
996 struct ieee80211_mgmt *mgmt,
997 struct ieee802_11_elems *elems)
1000 struct sta_info *sta;
1001 enum plink_event event;
1002 enum ieee80211_self_protected_actioncode ftype;
1004 u8 ie_len = elems->peering_len;
1007 if (!elems->peering) {
1009 "Mesh plink: missing necessary peer link ie\n");
1013 if (elems->rsn_len &&
1014 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1016 "Mesh plink: can't establish link with secure peer\n");
1020 ftype = mgmt->u.action.u.self_prot.action_code;
1021 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1022 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1023 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1026 "Mesh plink: incorrect plink ie length %d %d\n",
1031 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1032 (!elems->mesh_id || !elems->mesh_config)) {
1033 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1036 /* Note the lines below are correct, the llid in the frame is the plid
1037 * from the point of view of this host.
1039 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
1040 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1041 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1042 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
1044 /* WARNING: Only for sta pointer, is dropped & re-acquired */
1047 sta = sta_info_get(sdata, mgmt->sa);
1049 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1050 !rssi_threshold_check(sdata, sta)) {
1051 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1056 /* Now we will figure out the appropriate event... */
1057 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1059 if (event == OPN_ACPT) {
1061 /* allocate sta entry if necessary and update info */
1062 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
1064 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1068 } else if (!sta && event == OPN_RJCT) {
1069 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
1071 WLAN_REASON_MESH_CONFIG);
1073 } else if (!sta || event == PLINK_UNDEFINED) {
1074 /* something went wrong */
1078 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1079 if (!sta->plid && event == CNF_ACPT)
1082 changed |= mesh_plink_fsm(sdata, sta, event);
1088 ieee80211_mbss_info_change_notify(sdata, changed);
1091 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1092 struct ieee80211_mgmt *mgmt, size_t len,
1093 struct ieee80211_rx_status *rx_status)
1095 struct ieee802_11_elems elems;
1099 /* need action_code, aux */
1100 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1103 if (sdata->u.mesh.user_mpm)
1104 /* userspace must register for these */
1107 if (is_multicast_ether_addr(mgmt->da)) {
1109 "Mesh plink: ignore frame from multicast address\n");
1113 baseaddr = mgmt->u.action.u.self_prot.variable;
1114 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1115 if (mgmt->u.action.u.self_prot.action_code ==
1116 WLAN_SP_MESH_PEERING_CONFIRM) {
1120 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1121 mesh_process_plink_frame(sdata, mgmt, &elems);