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 <linux/rculist.h>
14 #include "ieee80211_i.h"
18 #define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2)
19 #define PLINK_GET_LLID(p) (p + 2)
20 #define PLINK_GET_PLID(p) (p + 4)
22 #define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \
23 jiffies + msecs_to_jiffies(t)))
37 static const char * const mplstates[] = {
38 [NL80211_PLINK_LISTEN] = "LISTEN",
39 [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
40 [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
41 [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
42 [NL80211_PLINK_ESTAB] = "ESTAB",
43 [NL80211_PLINK_HOLDING] = "HOLDING",
44 [NL80211_PLINK_BLOCKED] = "BLOCKED"
47 static const char * const mplevents[] = {
48 [PLINK_UNDEFINED] = "NONE",
49 [OPN_ACPT] = "OPN_ACPT",
50 [OPN_RJCT] = "OPN_RJCT",
51 [OPN_IGNR] = "OPN_IGNR",
52 [CNF_ACPT] = "CNF_ACPT",
53 [CNF_RJCT] = "CNF_RJCT",
54 [CNF_IGNR] = "CNF_IGNR",
55 [CLS_ACPT] = "CLS_ACPT",
56 [CLS_IGNR] = "CLS_IGNR"
59 /* We only need a valid sta if user configured a minimum rssi_threshold. */
60 static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
63 s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
64 return rssi_threshold == 0 ||
66 (s8)-ewma_signal_read(&sta->rx_stats_avg.signal) >
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->mesh->plink_lock
77 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
79 lockdep_assert_held(&sta->mesh->plink_lock);
80 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
81 sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0;
82 sta->mesh->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 struct ieee80211_supported_band *sband;
100 u32 erp_rates = 0, changed = 0;
102 bool short_slot = false;
104 sband = ieee80211_get_sband(sdata);
108 if (sband->band == NL80211_BAND_5GHZ) {
109 /* (IEEE 802.11-2012 19.4.5) */
112 } else if (sband->band != NL80211_BAND_2GHZ) {
116 for (i = 0; i < sband->n_bitrates; i++)
117 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
124 list_for_each_entry_rcu(sta, &local->sta_list, list) {
125 if (sdata != sta->sdata ||
126 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
130 if (erp_rates & sta->sta.supp_rates[sband->band])
138 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
139 sdata->vif.bss_conf.use_short_slot = short_slot;
140 changed = BSS_CHANGED_ERP_SLOT;
141 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
142 sdata->vif.addr, short_slot);
148 * mesh_set_ht_prot_mode - set correct HT protection mode
150 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
151 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
152 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
153 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
154 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
155 * HT20 peer is present. Otherwise no-protection mode is selected.
157 static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
159 struct ieee80211_local *local = sdata->local;
160 struct sta_info *sta;
162 bool non_ht_sta = false, ht20_sta = false;
164 switch (sdata->vif.bss_conf.chandef.width) {
165 case NL80211_CHAN_WIDTH_20_NOHT:
166 case NL80211_CHAN_WIDTH_5:
167 case NL80211_CHAN_WIDTH_10:
174 list_for_each_entry_rcu(sta, &local->sta_list, list) {
175 if (sdata != sta->sdata ||
176 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
179 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
182 if (!sta->sta.ht_cap.ht_supported) {
183 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
189 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
195 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
197 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
198 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
200 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
202 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
205 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
206 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
207 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
208 return BSS_CHANGED_HT;
211 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
212 struct sta_info *sta,
213 enum ieee80211_self_protected_actioncode action,
214 u8 *da, u16 llid, u16 plid, u16 reason)
216 struct ieee80211_local *local = sdata->local;
218 struct ieee80211_tx_info *info;
219 struct ieee80211_mgmt *mgmt;
220 bool include_plid = false;
221 u16 peering_proto = 0;
223 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
224 sizeof(mgmt->u.action.u.self_prot);
227 skb = dev_alloc_skb(local->tx_headroom +
229 2 + /* capability info */
231 2 + 8 + /* supported rates */
232 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
233 2 + sdata->u.mesh.mesh_id_len +
234 2 + sizeof(struct ieee80211_meshconf_ie) +
235 2 + sizeof(struct ieee80211_ht_cap) +
236 2 + sizeof(struct ieee80211_ht_operation) +
237 2 + sizeof(struct ieee80211_vht_cap) +
238 2 + sizeof(struct ieee80211_vht_operation) +
239 2 + 8 + /* peering IE */
240 sdata->u.mesh.ie_len);
243 info = IEEE80211_SKB_CB(skb);
244 skb_reserve(skb, local->tx_headroom);
245 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
246 memset(mgmt, 0, hdr_len);
247 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
248 IEEE80211_STYPE_ACTION);
249 memcpy(mgmt->da, da, ETH_ALEN);
250 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
251 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
252 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
253 mgmt->u.action.u.self_prot.action_code = action;
255 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
256 struct ieee80211_supported_band *sband;
257 enum nl80211_band band;
259 sband = ieee80211_get_sband(sdata);
266 /* capability info */
267 pos = skb_put_zero(skb, 2);
268 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
270 pos = skb_put(skb, 2);
271 put_unaligned_le16(sta->sta.aid, pos);
273 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
274 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
275 mesh_add_rsn_ie(sdata, skb) ||
276 mesh_add_meshid_ie(sdata, skb) ||
277 mesh_add_meshconf_ie(sdata, skb))
279 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
280 info->flags |= IEEE80211_TX_CTL_NO_ACK;
281 if (mesh_add_meshid_ie(sdata, skb))
285 /* Add Mesh Peering Management element */
287 case WLAN_SP_MESH_PEERING_OPEN:
289 case WLAN_SP_MESH_PEERING_CONFIRM:
293 case WLAN_SP_MESH_PEERING_CLOSE:
298 ie_len += 2; /* reason code */
305 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
308 pos = skb_put(skb, 2 + ie_len);
309 *pos++ = WLAN_EID_PEER_MGMT;
311 memcpy(pos, &peering_proto, 2);
313 put_unaligned_le16(llid, pos);
316 put_unaligned_le16(plid, pos);
319 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
320 put_unaligned_le16(reason, pos);
324 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
325 if (mesh_add_ht_cap_ie(sdata, skb) ||
326 mesh_add_ht_oper_ie(sdata, skb) ||
327 mesh_add_vht_cap_ie(sdata, skb) ||
328 mesh_add_vht_oper_ie(sdata, skb))
332 if (mesh_add_vendor_ies(sdata, skb))
335 ieee80211_tx_skb(sdata, skb);
343 * __mesh_plink_deactivate - deactivate mesh peer link
345 * @sta: mesh peer link to deactivate
347 * Mesh paths with this peer as next hop should be flushed
348 * by the caller outside of plink_lock.
350 * Returns beacon changed flag if the beacon content changed.
352 * Locking: the caller must hold sta->mesh->plink_lock
354 static u32 __mesh_plink_deactivate(struct sta_info *sta)
356 struct ieee80211_sub_if_data *sdata = sta->sdata;
359 lockdep_assert_held(&sta->mesh->plink_lock);
361 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
362 changed = mesh_plink_dec_estab_count(sdata);
363 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
365 ieee80211_mps_sta_status_update(sta);
366 changed |= ieee80211_mps_set_sta_local_pm(sta,
367 NL80211_MESH_POWER_UNKNOWN);
373 * mesh_plink_deactivate - deactivate mesh peer link
375 * @sta: mesh peer link to deactivate
377 * All mesh paths with this peer as next hop will be flushed
379 u32 mesh_plink_deactivate(struct sta_info *sta)
381 struct ieee80211_sub_if_data *sdata = sta->sdata;
384 spin_lock_bh(&sta->mesh->plink_lock);
385 changed = __mesh_plink_deactivate(sta);
387 if (!sdata->u.mesh.user_mpm) {
388 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
389 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
390 sta->sta.addr, sta->mesh->llid,
391 sta->mesh->plid, sta->mesh->reason);
393 spin_unlock_bh(&sta->mesh->plink_lock);
394 if (!sdata->u.mesh.user_mpm)
395 del_timer_sync(&sta->mesh->plink_timer);
396 mesh_path_flush_by_nexthop(sta);
398 /* make sure no readers can access nexthop sta from here on */
404 static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
405 struct sta_info *sta,
406 struct ieee802_11_elems *elems, bool insert)
408 struct ieee80211_local *local = sdata->local;
409 struct ieee80211_supported_band *sband;
410 u32 rates, basic_rates = 0, changed = 0;
411 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
413 sband = ieee80211_get_sband(sdata);
417 rates = ieee80211_sta_get_rates(sdata, elems, sband->band,
420 spin_lock_bh(&sta->mesh->plink_lock);
421 sta->rx_stats.last_rx = jiffies;
423 /* rates and capabilities don't change during peering */
424 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
425 sta->mesh->processed_beacon)
427 sta->mesh->processed_beacon = true;
429 if (sta->sta.supp_rates[sband->band] != rates)
430 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
431 sta->sta.supp_rates[sband->band] = rates;
433 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
434 elems->ht_cap_elem, sta))
435 changed |= IEEE80211_RC_BW_CHANGED;
437 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
438 elems->vht_cap_elem, sta);
440 if (bw != sta->sta.bandwidth)
441 changed |= IEEE80211_RC_BW_CHANGED;
443 /* HT peer is operating 20MHz-only */
444 if (elems->ht_operation &&
445 !(elems->ht_operation->ht_param &
446 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
447 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
448 changed |= IEEE80211_RC_BW_CHANGED;
449 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
453 rate_control_rate_init(sta);
455 rate_control_rate_update(local, sband, sta, changed);
457 spin_unlock_bh(&sta->mesh->plink_lock);
460 static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
462 struct sta_info *sta;
463 unsigned long *aid_map;
466 aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
467 sizeof(*aid_map), GFP_KERNEL);
471 /* reserve aid 0 for mcast indication */
472 __set_bit(0, aid_map);
475 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
476 __set_bit(sta->sta.aid, aid_map);
479 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
482 if (aid > IEEE80211_MAX_AID)
488 static struct sta_info *
489 __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
491 struct sta_info *sta;
494 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
497 aid = mesh_allocate_aid(sdata);
501 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
505 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
509 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
510 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
511 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
516 static struct sta_info *
517 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
518 struct ieee802_11_elems *elems)
520 struct sta_info *sta = NULL;
522 /* Userspace handles station allocation */
523 if (sdata->u.mesh.user_mpm ||
524 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
525 if (mesh_peer_accepts_plinks(elems) &&
526 mesh_plink_availables(sdata))
527 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
532 sta = __mesh_sta_info_alloc(sdata, addr);
538 * mesh_sta_info_get - return mesh sta info entry for @addr.
540 * @sdata: local meshif
541 * @addr: peer's address
542 * @elems: IEs from beacon or mesh peering frame.
544 * Return existing or newly allocated sta_info under RCU read lock.
545 * (re)initialize with given IEs.
547 static struct sta_info *
548 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
549 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
551 struct sta_info *sta = NULL;
554 sta = sta_info_get(sdata, addr);
556 mesh_sta_info_init(sdata, sta, elems, false);
559 /* can't run atomic */
560 sta = mesh_sta_info_alloc(sdata, addr, elems);
566 mesh_sta_info_init(sdata, sta, elems, true);
568 if (sta_info_insert_rcu(sta))
576 * mesh_neighbour_update - update or initialize new mesh neighbor.
578 * @sdata: local meshif
579 * @addr: peer's address
580 * @elems: IEs from beacon or mesh peering frame
582 * Initiates peering if appropriate.
584 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
586 struct ieee802_11_elems *elems)
588 struct sta_info *sta;
591 sta = mesh_sta_info_get(sdata, hw_addr, elems);
595 if (mesh_peer_accepts_plinks(elems) &&
596 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
597 sdata->u.mesh.accepting_plinks &&
598 sdata->u.mesh.mshcfg.auto_open_plinks &&
599 rssi_threshold_check(sdata, sta))
600 changed = mesh_plink_open(sta);
602 ieee80211_mps_frame_release(sta, elems);
605 ieee80211_mbss_info_change_notify(sdata, changed);
608 static void mesh_plink_timer(unsigned long data)
610 struct sta_info *sta;
612 struct ieee80211_sub_if_data *sdata;
613 struct mesh_config *mshcfg;
614 enum ieee80211_self_protected_actioncode action = 0;
617 * This STA is valid because sta_info_destroy() will
618 * del_timer_sync() this timer after having made sure
619 * it cannot be readded (by deleting the plink.)
621 sta = (struct sta_info *) data;
623 if (sta->sdata->local->quiescing)
626 spin_lock_bh(&sta->mesh->plink_lock);
628 /* If a timer fires just before a state transition on another CPU,
629 * we may have already extended the timeout and changed state by the
630 * time we've acquired the lock and arrived here. In that case,
631 * skip this timer and wait for the new one.
633 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
635 "Ignoring timer for %pM in state %s (timer adjusted)",
636 sta->sta.addr, mplstates[sta->mesh->plink_state]);
637 spin_unlock_bh(&sta->mesh->plink_lock);
641 /* del_timer() and handler may race when entering these states */
642 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
643 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
645 "Ignoring timer for %pM in state %s (timer deleted)",
646 sta->sta.addr, mplstates[sta->mesh->plink_state]);
647 spin_unlock_bh(&sta->mesh->plink_lock);
652 "Mesh plink timer for %pM fired on state %s\n",
653 sta->sta.addr, mplstates[sta->mesh->plink_state]);
655 mshcfg = &sdata->u.mesh.mshcfg;
657 switch (sta->mesh->plink_state) {
658 case NL80211_PLINK_OPN_RCVD:
659 case NL80211_PLINK_OPN_SNT:
661 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
664 "Mesh plink for %pM (retry, timeout): %d %d\n",
665 sta->sta.addr, sta->mesh->plink_retries,
666 sta->mesh->plink_timeout);
667 get_random_bytes(&rand, sizeof(u32));
668 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
669 rand % sta->mesh->plink_timeout;
670 ++sta->mesh->plink_retries;
671 mod_plink_timer(sta, sta->mesh->plink_timeout);
672 action = WLAN_SP_MESH_PEERING_OPEN;
675 reason = WLAN_REASON_MESH_MAX_RETRIES;
676 /* fall through on else */
677 case NL80211_PLINK_CNF_RCVD:
680 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
681 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
682 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
683 action = WLAN_SP_MESH_PEERING_CLOSE;
685 case NL80211_PLINK_HOLDING:
687 del_timer(&sta->mesh->plink_timer);
688 mesh_plink_fsm_restart(sta);
693 spin_unlock_bh(&sta->mesh->plink_lock);
695 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
696 sta->mesh->llid, sta->mesh->plid, reason);
699 static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
701 sta->mesh->plink_timer.expires = jiffies + msecs_to_jiffies(timeout);
702 sta->mesh->plink_timer.data = (unsigned long) sta;
703 sta->mesh->plink_timer.function = mesh_plink_timer;
704 sta->mesh->plink_timeout = timeout;
705 add_timer(&sta->mesh->plink_timer);
708 static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
711 struct ieee80211_local *local = sdata->local;
713 struct sta_info *sta;
716 list_for_each_entry_rcu(sta, &local->sta_list, list) {
717 if (sdata != sta->sdata)
720 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
730 static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
735 get_random_bytes(&llid, sizeof(llid));
736 } while (llid_in_use(sdata, llid));
741 u32 mesh_plink_open(struct sta_info *sta)
743 struct ieee80211_sub_if_data *sdata = sta->sdata;
746 if (!test_sta_flag(sta, WLAN_STA_AUTH))
749 spin_lock_bh(&sta->mesh->plink_lock);
750 sta->mesh->llid = mesh_get_new_llid(sdata);
751 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
752 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
753 spin_unlock_bh(&sta->mesh->plink_lock);
756 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
757 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
758 spin_unlock_bh(&sta->mesh->plink_lock);
760 "Mesh plink: starting establishment with %pM\n",
763 /* set the non-peer mode to active during peering */
764 changed = ieee80211_mps_local_status_update(sdata);
766 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
767 sta->sta.addr, sta->mesh->llid, 0, 0);
771 u32 mesh_plink_block(struct sta_info *sta)
775 spin_lock_bh(&sta->mesh->plink_lock);
776 changed = __mesh_plink_deactivate(sta);
777 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
778 spin_unlock_bh(&sta->mesh->plink_lock);
779 mesh_path_flush_by_nexthop(sta);
784 static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
785 struct sta_info *sta,
786 enum plink_event event)
788 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
789 u16 reason = (event == CLS_ACPT) ?
790 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
792 sta->mesh->reason = reason;
793 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
794 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
797 static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
798 struct sta_info *sta)
800 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
803 del_timer(&sta->mesh->plink_timer);
804 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
805 changed |= mesh_plink_inc_estab_count(sdata);
806 changed |= mesh_set_ht_prot_mode(sdata);
807 changed |= mesh_set_short_slot_time(sdata);
808 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
809 ieee80211_mps_sta_status_update(sta);
810 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
815 * mesh_plink_fsm - step @sta MPM based on @event
818 * @sta: mesh neighbor
819 * @event: peering event
821 * Return: changed MBSS flags
823 static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
824 struct sta_info *sta, enum plink_event event)
826 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
827 enum ieee80211_self_protected_actioncode action = 0;
831 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
832 mplstates[sta->mesh->plink_state], mplevents[event]);
834 spin_lock_bh(&sta->mesh->plink_lock);
835 switch (sta->mesh->plink_state) {
836 case NL80211_PLINK_LISTEN:
839 mesh_plink_fsm_restart(sta);
842 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
843 sta->mesh->llid = mesh_get_new_llid(sdata);
844 mesh_plink_timer_set(sta,
845 mshcfg->dot11MeshRetryTimeout);
847 /* set the non-peer mode to active during peering */
848 changed |= ieee80211_mps_local_status_update(sdata);
849 action = WLAN_SP_MESH_PEERING_OPEN;
855 case NL80211_PLINK_OPN_SNT:
860 mesh_plink_close(sdata, sta, event);
861 action = WLAN_SP_MESH_PEERING_CLOSE;
864 /* retry timer is left untouched */
865 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
866 action = WLAN_SP_MESH_PEERING_CONFIRM;
869 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
870 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
876 case NL80211_PLINK_OPN_RCVD:
881 mesh_plink_close(sdata, sta, event);
882 action = WLAN_SP_MESH_PEERING_CLOSE;
885 action = WLAN_SP_MESH_PEERING_CONFIRM;
888 changed |= mesh_plink_establish(sdata, sta);
894 case NL80211_PLINK_CNF_RCVD:
899 mesh_plink_close(sdata, sta, event);
900 action = WLAN_SP_MESH_PEERING_CLOSE;
903 changed |= mesh_plink_establish(sdata, sta);
904 action = WLAN_SP_MESH_PEERING_CONFIRM;
910 case NL80211_PLINK_ESTAB:
913 changed |= __mesh_plink_deactivate(sta);
914 changed |= mesh_set_ht_prot_mode(sdata);
915 changed |= mesh_set_short_slot_time(sdata);
916 mesh_plink_close(sdata, sta, event);
917 action = WLAN_SP_MESH_PEERING_CLOSE;
921 action = WLAN_SP_MESH_PEERING_CONFIRM;
927 case NL80211_PLINK_HOLDING:
930 del_timer(&sta->mesh->plink_timer);
931 mesh_plink_fsm_restart(sta);
937 action = WLAN_SP_MESH_PEERING_CLOSE;
944 /* should not get here, PLINK_BLOCKED is dealt with at the
945 * beginning of the function
949 spin_unlock_bh(&sta->mesh->plink_lock);
951 mesh_path_flush_by_nexthop(sta);
953 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
954 sta->mesh->llid, sta->mesh->plid,
957 /* also send confirm in open case */
958 if (action == WLAN_SP_MESH_PEERING_OPEN) {
959 mesh_plink_frame_tx(sdata, sta,
960 WLAN_SP_MESH_PEERING_CONFIRM,
961 sta->sta.addr, sta->mesh->llid,
970 * mesh_plink_get_event - get correct MPM event
973 * @sta: peer, leave NULL if processing a frame from a new suitable peer
974 * @elems: peering management IEs
976 * @llid: peer's peer link ID
977 * @plid: peer's local link ID
979 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
982 static enum plink_event
983 mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
984 struct sta_info *sta,
985 struct ieee802_11_elems *elems,
986 enum ieee80211_self_protected_actioncode ftype,
989 enum plink_event event = PLINK_UNDEFINED;
990 u8 ie_len = elems->peering_len;
993 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
994 mesh_matches_local(sdata, elems));
996 /* deny open request from non-matching peer */
997 if (!matches_local && !sta) {
1003 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1004 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1007 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1008 if (!mesh_plink_free_count(sdata)) {
1009 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1013 /* new matching peer */
1017 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1018 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1021 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
1026 case WLAN_SP_MESH_PEERING_OPEN:
1029 if (!mesh_plink_free_count(sdata) ||
1030 (sta->mesh->plid && sta->mesh->plid != plid))
1035 case WLAN_SP_MESH_PEERING_CONFIRM:
1038 if (!mesh_plink_free_count(sdata) ||
1039 sta->mesh->llid != llid ||
1040 (sta->mesh->plid && sta->mesh->plid != plid))
1045 case WLAN_SP_MESH_PEERING_CLOSE:
1046 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
1047 /* Do not check for llid or plid. This does not
1048 * follow the standard but since multiple plinks
1049 * per sta are not supported, it is necessary in
1050 * order to avoid a livelock when MP A sees an
1051 * establish peer link to MP B but MP B does not
1052 * see it. This can be caused by a timeout in
1053 * B's peer link establishment or B beign
1057 else if (sta->mesh->plid != plid)
1059 else if (ie_len == 8 && sta->mesh->llid != llid)
1065 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1074 mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1075 struct ieee80211_mgmt *mgmt,
1076 struct ieee802_11_elems *elems)
1079 struct sta_info *sta;
1080 enum plink_event event;
1081 enum ieee80211_self_protected_actioncode ftype;
1083 u8 ie_len = elems->peering_len;
1086 if (!elems->peering) {
1088 "Mesh plink: missing necessary peer link ie\n");
1092 if (elems->rsn_len &&
1093 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1095 "Mesh plink: can't establish link with secure peer\n");
1099 ftype = mgmt->u.action.u.self_prot.action_code;
1100 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1101 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1102 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1105 "Mesh plink: incorrect plink ie length %d %d\n",
1110 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1111 (!elems->mesh_id || !elems->mesh_config)) {
1112 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1115 /* Note the lines below are correct, the llid in the frame is the plid
1116 * from the point of view of this host.
1118 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
1119 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1120 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1121 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
1123 /* WARNING: Only for sta pointer, is dropped & re-acquired */
1126 sta = sta_info_get(sdata, mgmt->sa);
1128 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1129 !rssi_threshold_check(sdata, sta)) {
1130 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1135 /* Now we will figure out the appropriate event... */
1136 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1138 if (event == OPN_ACPT) {
1140 /* allocate sta entry if necessary and update info */
1141 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
1143 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1146 sta->mesh->plid = plid;
1147 } else if (!sta && event == OPN_RJCT) {
1148 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
1150 WLAN_REASON_MESH_CONFIG);
1152 } else if (!sta || event == PLINK_UNDEFINED) {
1153 /* something went wrong */
1157 if (event == CNF_ACPT) {
1158 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1159 if (!sta->mesh->plid)
1160 sta->mesh->plid = plid;
1162 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1165 changed |= mesh_plink_fsm(sdata, sta, event);
1171 ieee80211_mbss_info_change_notify(sdata, changed);
1174 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1175 struct ieee80211_mgmt *mgmt, size_t len,
1176 struct ieee80211_rx_status *rx_status)
1178 struct ieee802_11_elems elems;
1182 /* need action_code, aux */
1183 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1186 if (sdata->u.mesh.user_mpm)
1187 /* userspace must register for these */
1190 if (is_multicast_ether_addr(mgmt->da)) {
1192 "Mesh plink: ignore frame from multicast address\n");
1196 baseaddr = mgmt->u.action.u.self_prot.variable;
1197 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1198 if (mgmt->u.action.u.self_prot.action_code ==
1199 WLAN_SP_MESH_PEERING_CONFIRM) {
1206 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1207 mesh_process_plink_frame(sdata, mgmt, &elems);