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 = offsetofend(struct ieee80211_mgmt, u.action.u.self_prot);
226 skb = dev_alloc_skb(local->tx_headroom +
228 2 + /* capability info */
230 2 + 8 + /* supported rates */
231 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
232 2 + sdata->u.mesh.mesh_id_len +
233 2 + sizeof(struct ieee80211_meshconf_ie) +
234 2 + sizeof(struct ieee80211_ht_cap) +
235 2 + sizeof(struct ieee80211_ht_operation) +
236 2 + sizeof(struct ieee80211_vht_cap) +
237 2 + sizeof(struct ieee80211_vht_operation) +
238 2 + 8 + /* peering IE */
239 sdata->u.mesh.ie_len);
242 info = IEEE80211_SKB_CB(skb);
243 skb_reserve(skb, local->tx_headroom);
244 mgmt = skb_put_zero(skb, hdr_len);
245 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
246 IEEE80211_STYPE_ACTION);
247 memcpy(mgmt->da, da, ETH_ALEN);
248 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
249 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
250 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
251 mgmt->u.action.u.self_prot.action_code = action;
253 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
254 struct ieee80211_supported_band *sband;
255 enum nl80211_band band;
257 sband = ieee80211_get_sband(sdata);
264 /* capability info */
265 pos = skb_put_zero(skb, 2);
266 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
268 pos = skb_put(skb, 2);
269 put_unaligned_le16(sta->sta.aid, pos);
271 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
272 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
273 mesh_add_rsn_ie(sdata, skb) ||
274 mesh_add_meshid_ie(sdata, skb) ||
275 mesh_add_meshconf_ie(sdata, skb))
277 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
278 info->flags |= IEEE80211_TX_CTL_NO_ACK;
279 if (mesh_add_meshid_ie(sdata, skb))
283 /* Add Mesh Peering Management element */
285 case WLAN_SP_MESH_PEERING_OPEN:
287 case WLAN_SP_MESH_PEERING_CONFIRM:
291 case WLAN_SP_MESH_PEERING_CLOSE:
296 ie_len += 2; /* reason code */
303 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
306 pos = skb_put(skb, 2 + ie_len);
307 *pos++ = WLAN_EID_PEER_MGMT;
309 memcpy(pos, &peering_proto, 2);
311 put_unaligned_le16(llid, pos);
314 put_unaligned_le16(plid, pos);
317 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
318 put_unaligned_le16(reason, pos);
322 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
323 if (mesh_add_ht_cap_ie(sdata, skb) ||
324 mesh_add_ht_oper_ie(sdata, skb) ||
325 mesh_add_vht_cap_ie(sdata, skb) ||
326 mesh_add_vht_oper_ie(sdata, skb))
330 if (mesh_add_vendor_ies(sdata, skb))
333 ieee80211_tx_skb(sdata, skb);
341 * __mesh_plink_deactivate - deactivate mesh peer link
343 * @sta: mesh peer link to deactivate
345 * Mesh paths with this peer as next hop should be flushed
346 * by the caller outside of plink_lock.
348 * Returns beacon changed flag if the beacon content changed.
350 * Locking: the caller must hold sta->mesh->plink_lock
352 static u32 __mesh_plink_deactivate(struct sta_info *sta)
354 struct ieee80211_sub_if_data *sdata = sta->sdata;
357 lockdep_assert_held(&sta->mesh->plink_lock);
359 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
360 changed = mesh_plink_dec_estab_count(sdata);
361 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
363 ieee80211_mps_sta_status_update(sta);
364 changed |= ieee80211_mps_set_sta_local_pm(sta,
365 NL80211_MESH_POWER_UNKNOWN);
371 * mesh_plink_deactivate - deactivate mesh peer link
373 * @sta: mesh peer link to deactivate
375 * All mesh paths with this peer as next hop will be flushed
377 u32 mesh_plink_deactivate(struct sta_info *sta)
379 struct ieee80211_sub_if_data *sdata = sta->sdata;
382 spin_lock_bh(&sta->mesh->plink_lock);
383 changed = __mesh_plink_deactivate(sta);
385 if (!sdata->u.mesh.user_mpm) {
386 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
387 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
388 sta->sta.addr, sta->mesh->llid,
389 sta->mesh->plid, sta->mesh->reason);
391 spin_unlock_bh(&sta->mesh->plink_lock);
392 if (!sdata->u.mesh.user_mpm)
393 del_timer_sync(&sta->mesh->plink_timer);
394 mesh_path_flush_by_nexthop(sta);
396 /* make sure no readers can access nexthop sta from here on */
402 static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
403 struct sta_info *sta,
404 struct ieee802_11_elems *elems)
406 struct ieee80211_local *local = sdata->local;
407 struct ieee80211_supported_band *sband;
408 u32 rates, basic_rates = 0, changed = 0;
409 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
411 sband = ieee80211_get_sband(sdata);
415 rates = ieee80211_sta_get_rates(sdata, elems, sband->band,
418 spin_lock_bh(&sta->mesh->plink_lock);
419 sta->rx_stats.last_rx = jiffies;
421 /* rates and capabilities don't change during peering */
422 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
423 sta->mesh->processed_beacon)
425 sta->mesh->processed_beacon = true;
427 if (sta->sta.supp_rates[sband->band] != rates)
428 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
429 sta->sta.supp_rates[sband->band] = rates;
431 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
432 elems->ht_cap_elem, sta))
433 changed |= IEEE80211_RC_BW_CHANGED;
435 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
436 elems->vht_cap_elem, sta);
438 if (bw != sta->sta.bandwidth)
439 changed |= IEEE80211_RC_BW_CHANGED;
441 /* HT peer is operating 20MHz-only */
442 if (elems->ht_operation &&
443 !(elems->ht_operation->ht_param &
444 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
445 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
446 changed |= IEEE80211_RC_BW_CHANGED;
447 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
450 if (!test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
451 rate_control_rate_init(sta);
453 rate_control_rate_update(local, sband, sta, changed);
455 spin_unlock_bh(&sta->mesh->plink_lock);
458 static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
460 struct sta_info *sta;
461 unsigned long *aid_map;
464 aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
465 sizeof(*aid_map), GFP_KERNEL);
469 /* reserve aid 0 for mcast indication */
470 __set_bit(0, aid_map);
473 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
474 __set_bit(sta->sta.aid, aid_map);
477 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
480 if (aid > IEEE80211_MAX_AID)
486 static struct sta_info *
487 __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
489 struct sta_info *sta;
492 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
495 aid = mesh_allocate_aid(sdata);
499 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
503 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
507 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
508 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
509 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
514 static struct sta_info *
515 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
516 struct ieee802_11_elems *elems,
517 struct ieee80211_rx_status *rx_status)
519 struct sta_info *sta = NULL;
521 /* Userspace handles station allocation */
522 if (sdata->u.mesh.user_mpm ||
523 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
524 if (mesh_peer_accepts_plinks(elems) &&
525 mesh_plink_availables(sdata)) {
528 if (ieee80211_hw_check(&sdata->local->hw, SIGNAL_DBM))
529 sig = rx_status->signal;
531 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
537 sta = __mesh_sta_info_alloc(sdata, addr);
543 * mesh_sta_info_get - return mesh sta info entry for @addr.
545 * @sdata: local meshif
546 * @addr: peer's address
547 * @elems: IEs from beacon or mesh peering frame.
548 * @rx_status: rx status for the frame for signal reporting
550 * Return existing or newly allocated sta_info under RCU read lock.
551 * (re)initialize with given IEs.
553 static struct sta_info *
554 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
555 u8 *addr, struct ieee802_11_elems *elems,
556 struct ieee80211_rx_status *rx_status) __acquires(RCU)
558 struct sta_info *sta = NULL;
561 sta = sta_info_get(sdata, addr);
563 mesh_sta_info_init(sdata, sta, elems);
566 /* can't run atomic */
567 sta = mesh_sta_info_alloc(sdata, addr, elems, rx_status);
573 mesh_sta_info_init(sdata, sta, elems);
575 if (sta_info_insert_rcu(sta))
583 * mesh_neighbour_update - update or initialize new mesh neighbor.
585 * @sdata: local meshif
586 * @addr: peer's address
587 * @elems: IEs from beacon or mesh peering frame
588 * @rx_status: rx status for the frame for signal reporting
590 * Initiates peering if appropriate.
592 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
594 struct ieee802_11_elems *elems,
595 struct ieee80211_rx_status *rx_status)
597 struct sta_info *sta;
600 sta = mesh_sta_info_get(sdata, hw_addr, elems, rx_status);
604 sta->mesh->connected_to_gate = elems->mesh_config->meshconf_form &
605 IEEE80211_MESHCONF_FORM_CONNECTED_TO_GATE;
607 if (mesh_peer_accepts_plinks(elems) &&
608 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
609 sdata->u.mesh.accepting_plinks &&
610 sdata->u.mesh.mshcfg.auto_open_plinks &&
611 rssi_threshold_check(sdata, sta))
612 changed = mesh_plink_open(sta);
614 ieee80211_mps_frame_release(sta, elems);
617 ieee80211_mbss_info_change_notify(sdata, changed);
620 void mesh_plink_timer(struct timer_list *t)
622 struct mesh_sta *mesh = from_timer(mesh, t, plink_timer);
623 struct sta_info *sta;
625 struct ieee80211_sub_if_data *sdata;
626 struct mesh_config *mshcfg;
627 enum ieee80211_self_protected_actioncode action = 0;
630 * This STA is valid because sta_info_destroy() will
631 * del_timer_sync() this timer after having made sure
632 * it cannot be readded (by deleting the plink.)
634 sta = mesh->plink_sta;
636 if (sta->sdata->local->quiescing)
639 spin_lock_bh(&sta->mesh->plink_lock);
641 /* If a timer fires just before a state transition on another CPU,
642 * we may have already extended the timeout and changed state by the
643 * time we've acquired the lock and arrived here. In that case,
644 * skip this timer and wait for the new one.
646 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
648 "Ignoring timer for %pM in state %s (timer adjusted)",
649 sta->sta.addr, mplstates[sta->mesh->plink_state]);
650 spin_unlock_bh(&sta->mesh->plink_lock);
654 /* del_timer() and handler may race when entering these states */
655 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
656 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
658 "Ignoring timer for %pM in state %s (timer deleted)",
659 sta->sta.addr, mplstates[sta->mesh->plink_state]);
660 spin_unlock_bh(&sta->mesh->plink_lock);
665 "Mesh plink timer for %pM fired on state %s\n",
666 sta->sta.addr, mplstates[sta->mesh->plink_state]);
668 mshcfg = &sdata->u.mesh.mshcfg;
670 switch (sta->mesh->plink_state) {
671 case NL80211_PLINK_OPN_RCVD:
672 case NL80211_PLINK_OPN_SNT:
674 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
677 "Mesh plink for %pM (retry, timeout): %d %d\n",
678 sta->sta.addr, sta->mesh->plink_retries,
679 sta->mesh->plink_timeout);
680 get_random_bytes(&rand, sizeof(u32));
681 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
682 rand % sta->mesh->plink_timeout;
683 ++sta->mesh->plink_retries;
684 mod_plink_timer(sta, sta->mesh->plink_timeout);
685 action = WLAN_SP_MESH_PEERING_OPEN;
688 reason = WLAN_REASON_MESH_MAX_RETRIES;
690 case NL80211_PLINK_CNF_RCVD:
693 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
694 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
695 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
696 action = WLAN_SP_MESH_PEERING_CLOSE;
698 case NL80211_PLINK_HOLDING:
700 del_timer(&sta->mesh->plink_timer);
701 mesh_plink_fsm_restart(sta);
706 spin_unlock_bh(&sta->mesh->plink_lock);
708 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
709 sta->mesh->llid, sta->mesh->plid, reason);
712 static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
714 sta->mesh->plink_timeout = timeout;
715 mod_timer(&sta->mesh->plink_timer, jiffies + msecs_to_jiffies(timeout));
718 static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
721 struct ieee80211_local *local = sdata->local;
723 struct sta_info *sta;
726 list_for_each_entry_rcu(sta, &local->sta_list, list) {
727 if (sdata != sta->sdata)
730 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
740 static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
745 get_random_bytes(&llid, sizeof(llid));
746 } while (llid_in_use(sdata, llid));
751 u32 mesh_plink_open(struct sta_info *sta)
753 struct ieee80211_sub_if_data *sdata = sta->sdata;
756 if (!test_sta_flag(sta, WLAN_STA_AUTH))
759 spin_lock_bh(&sta->mesh->plink_lock);
760 sta->mesh->llid = mesh_get_new_llid(sdata);
761 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
762 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
763 spin_unlock_bh(&sta->mesh->plink_lock);
766 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
767 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
768 spin_unlock_bh(&sta->mesh->plink_lock);
770 "Mesh plink: starting establishment with %pM\n",
773 /* set the non-peer mode to active during peering */
774 changed = ieee80211_mps_local_status_update(sdata);
776 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
777 sta->sta.addr, sta->mesh->llid, 0, 0);
781 u32 mesh_plink_block(struct sta_info *sta)
785 spin_lock_bh(&sta->mesh->plink_lock);
786 changed = __mesh_plink_deactivate(sta);
787 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
788 spin_unlock_bh(&sta->mesh->plink_lock);
789 mesh_path_flush_by_nexthop(sta);
794 static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
795 struct sta_info *sta,
796 enum plink_event event)
798 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
799 u16 reason = (event == CLS_ACPT) ?
800 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
802 sta->mesh->reason = reason;
803 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
804 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
807 static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
808 struct sta_info *sta)
810 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
813 del_timer(&sta->mesh->plink_timer);
814 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
815 changed |= mesh_plink_inc_estab_count(sdata);
816 changed |= mesh_set_ht_prot_mode(sdata);
817 changed |= mesh_set_short_slot_time(sdata);
818 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
819 ieee80211_mps_sta_status_update(sta);
820 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
825 * mesh_plink_fsm - step @sta MPM based on @event
828 * @sta: mesh neighbor
829 * @event: peering event
831 * Return: changed MBSS flags
833 static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
834 struct sta_info *sta, enum plink_event event)
836 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
837 enum ieee80211_self_protected_actioncode action = 0;
841 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
842 mplstates[sta->mesh->plink_state], mplevents[event]);
844 spin_lock_bh(&sta->mesh->plink_lock);
845 switch (sta->mesh->plink_state) {
846 case NL80211_PLINK_LISTEN:
849 mesh_plink_fsm_restart(sta);
852 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
853 sta->mesh->llid = mesh_get_new_llid(sdata);
854 mesh_plink_timer_set(sta,
855 mshcfg->dot11MeshRetryTimeout);
857 /* set the non-peer mode to active during peering */
858 changed |= ieee80211_mps_local_status_update(sdata);
859 action = WLAN_SP_MESH_PEERING_OPEN;
865 case NL80211_PLINK_OPN_SNT:
870 mesh_plink_close(sdata, sta, event);
871 action = WLAN_SP_MESH_PEERING_CLOSE;
874 /* retry timer is left untouched */
875 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
876 action = WLAN_SP_MESH_PEERING_CONFIRM;
879 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
880 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
886 case NL80211_PLINK_OPN_RCVD:
891 mesh_plink_close(sdata, sta, event);
892 action = WLAN_SP_MESH_PEERING_CLOSE;
895 action = WLAN_SP_MESH_PEERING_CONFIRM;
898 changed |= mesh_plink_establish(sdata, sta);
904 case NL80211_PLINK_CNF_RCVD:
909 mesh_plink_close(sdata, sta, event);
910 action = WLAN_SP_MESH_PEERING_CLOSE;
913 changed |= mesh_plink_establish(sdata, sta);
914 action = WLAN_SP_MESH_PEERING_CONFIRM;
920 case NL80211_PLINK_ESTAB:
923 changed |= __mesh_plink_deactivate(sta);
924 changed |= mesh_set_ht_prot_mode(sdata);
925 changed |= mesh_set_short_slot_time(sdata);
926 mesh_plink_close(sdata, sta, event);
927 action = WLAN_SP_MESH_PEERING_CLOSE;
931 action = WLAN_SP_MESH_PEERING_CONFIRM;
937 case NL80211_PLINK_HOLDING:
940 del_timer(&sta->mesh->plink_timer);
941 mesh_plink_fsm_restart(sta);
947 action = WLAN_SP_MESH_PEERING_CLOSE;
954 /* should not get here, PLINK_BLOCKED is dealt with at the
955 * beginning of the function
959 spin_unlock_bh(&sta->mesh->plink_lock);
961 mesh_path_flush_by_nexthop(sta);
963 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
964 sta->mesh->llid, sta->mesh->plid,
967 /* also send confirm in open case */
968 if (action == WLAN_SP_MESH_PEERING_OPEN) {
969 mesh_plink_frame_tx(sdata, sta,
970 WLAN_SP_MESH_PEERING_CONFIRM,
971 sta->sta.addr, sta->mesh->llid,
980 * mesh_plink_get_event - get correct MPM event
983 * @sta: peer, leave NULL if processing a frame from a new suitable peer
984 * @elems: peering management IEs
986 * @llid: peer's peer link ID
987 * @plid: peer's local link ID
989 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
992 static enum plink_event
993 mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
994 struct sta_info *sta,
995 struct ieee802_11_elems *elems,
996 enum ieee80211_self_protected_actioncode ftype,
999 enum plink_event event = PLINK_UNDEFINED;
1000 u8 ie_len = elems->peering_len;
1003 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
1004 mesh_matches_local(sdata, elems));
1006 /* deny open request from non-matching peer */
1007 if (!matches_local && !sta) {
1013 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1014 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1017 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1018 if (!mesh_plink_free_count(sdata)) {
1019 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1023 /* new matching peer */
1027 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1028 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1031 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
1036 case WLAN_SP_MESH_PEERING_OPEN:
1039 if (!mesh_plink_free_count(sdata) ||
1040 (sta->mesh->plid && sta->mesh->plid != plid))
1045 case WLAN_SP_MESH_PEERING_CONFIRM:
1048 if (!mesh_plink_free_count(sdata) ||
1049 sta->mesh->llid != llid ||
1050 (sta->mesh->plid && sta->mesh->plid != plid))
1055 case WLAN_SP_MESH_PEERING_CLOSE:
1056 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
1057 /* Do not check for llid or plid. This does not
1058 * follow the standard but since multiple plinks
1059 * per sta are not supported, it is necessary in
1060 * order to avoid a livelock when MP A sees an
1061 * establish peer link to MP B but MP B does not
1062 * see it. This can be caused by a timeout in
1063 * B's peer link establishment or B beign
1067 else if (sta->mesh->plid != plid)
1069 else if (ie_len == 8 && sta->mesh->llid != llid)
1075 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1084 mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1085 struct ieee80211_mgmt *mgmt,
1086 struct ieee802_11_elems *elems,
1087 struct ieee80211_rx_status *rx_status)
1090 struct sta_info *sta;
1091 enum plink_event event;
1092 enum ieee80211_self_protected_actioncode ftype;
1094 u8 ie_len = elems->peering_len;
1097 if (!elems->peering) {
1099 "Mesh plink: missing necessary peer link ie\n");
1103 if (elems->rsn_len &&
1104 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1106 "Mesh plink: can't establish link with secure peer\n");
1110 ftype = mgmt->u.action.u.self_prot.action_code;
1111 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1112 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1113 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1116 "Mesh plink: incorrect plink ie length %d %d\n",
1121 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1122 (!elems->mesh_id || !elems->mesh_config)) {
1123 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1126 /* Note the lines below are correct, the llid in the frame is the plid
1127 * from the point of view of this host.
1129 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
1130 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1131 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1132 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
1134 /* WARNING: Only for sta pointer, is dropped & re-acquired */
1137 sta = sta_info_get(sdata, mgmt->sa);
1139 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1140 !rssi_threshold_check(sdata, sta)) {
1141 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1146 /* Now we will figure out the appropriate event... */
1147 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1149 if (event == OPN_ACPT) {
1151 /* allocate sta entry if necessary and update info */
1152 sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status);
1154 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1157 sta->mesh->plid = plid;
1158 } else if (!sta && event == OPN_RJCT) {
1159 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
1161 WLAN_REASON_MESH_CONFIG);
1163 } else if (!sta || event == PLINK_UNDEFINED) {
1164 /* something went wrong */
1168 if (event == CNF_ACPT) {
1169 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1170 if (!sta->mesh->plid)
1171 sta->mesh->plid = plid;
1173 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1176 changed |= mesh_plink_fsm(sdata, sta, event);
1182 ieee80211_mbss_info_change_notify(sdata, changed);
1185 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1186 struct ieee80211_mgmt *mgmt, size_t len,
1187 struct ieee80211_rx_status *rx_status)
1189 struct ieee802_11_elems elems;
1193 /* need action_code, aux */
1194 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1197 if (sdata->u.mesh.user_mpm)
1198 /* userspace must register for these */
1201 if (is_multicast_ether_addr(mgmt->da)) {
1203 "Mesh plink: ignore frame from multicast address\n");
1207 baseaddr = mgmt->u.action.u.self_prot.variable;
1208 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1209 if (mgmt->u.action.u.self_prot.action_code ==
1210 WLAN_SP_MESH_PEERING_CONFIRM) {
1217 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1218 mesh_process_plink_frame(sdata, mgmt, &elems, rx_status);