1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2008, 2009 open80211s Ltd.
4 * Copyright (C) 2019 Intel Corporation
5 * Author: Luis Carlos Cobo <luisca@cozybit.com>
8 #include <linux/kernel.h>
9 #include <linux/random.h>
10 #include <linux/rculist.h>
12 #include "ieee80211_i.h"
16 #define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2)
17 #define PLINK_GET_LLID(p) (p + 2)
18 #define PLINK_GET_PLID(p) (p + 4)
20 #define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \
21 jiffies + msecs_to_jiffies(t)))
35 static const char * const mplstates[] = {
36 [NL80211_PLINK_LISTEN] = "LISTEN",
37 [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
38 [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
39 [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
40 [NL80211_PLINK_ESTAB] = "ESTAB",
41 [NL80211_PLINK_HOLDING] = "HOLDING",
42 [NL80211_PLINK_BLOCKED] = "BLOCKED"
45 static const char * const mplevents[] = {
46 [PLINK_UNDEFINED] = "NONE",
47 [OPN_ACPT] = "OPN_ACPT",
48 [OPN_RJCT] = "OPN_RJCT",
49 [OPN_IGNR] = "OPN_IGNR",
50 [CNF_ACPT] = "CNF_ACPT",
51 [CNF_RJCT] = "CNF_RJCT",
52 [CNF_IGNR] = "CNF_IGNR",
53 [CLS_ACPT] = "CLS_ACPT",
54 [CLS_IGNR] = "CLS_IGNR"
57 /* We only need a valid sta if user configured a minimum rssi_threshold. */
58 static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
61 s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
62 return rssi_threshold == 0 ||
64 (s8)-ewma_signal_read(&sta->rx_stats_avg.signal) >
69 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
71 * @sta: mesh peer link to restart
73 * Locking: this function must be called holding sta->mesh->plink_lock
75 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
77 lockdep_assert_held(&sta->mesh->plink_lock);
78 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
79 sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0;
80 sta->mesh->plink_retries = 0;
84 * mesh_set_short_slot_time - enable / disable ERP short slot time.
86 * The standard indirectly mandates mesh STAs to turn off short slot time by
87 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
88 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
89 * MBSS support ERP rates.
91 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
93 static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
95 struct ieee80211_local *local = sdata->local;
96 struct ieee80211_supported_band *sband;
98 u32 erp_rates = 0, changed = 0;
100 bool short_slot = false;
102 sband = ieee80211_get_sband(sdata);
106 if (sband->band == NL80211_BAND_5GHZ) {
107 /* (IEEE 802.11-2012 19.4.5) */
110 } else if (sband->band != NL80211_BAND_2GHZ) {
114 for (i = 0; i < sband->n_bitrates; i++)
115 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
122 list_for_each_entry_rcu(sta, &local->sta_list, list) {
123 if (sdata != sta->sdata ||
124 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
128 if (erp_rates & sta->sta.supp_rates[sband->band])
136 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
137 sdata->vif.bss_conf.use_short_slot = short_slot;
138 changed = BSS_CHANGED_ERP_SLOT;
139 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
140 sdata->vif.addr, short_slot);
146 * mesh_set_ht_prot_mode - set correct HT protection mode
148 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
149 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
150 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
151 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
152 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
153 * HT20 peer is present. Otherwise no-protection mode is selected.
155 static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
157 struct ieee80211_local *local = sdata->local;
158 struct sta_info *sta;
160 bool non_ht_sta = false, ht20_sta = false;
162 switch (sdata->vif.bss_conf.chandef.width) {
163 case NL80211_CHAN_WIDTH_20_NOHT:
164 case NL80211_CHAN_WIDTH_5:
165 case NL80211_CHAN_WIDTH_10:
172 list_for_each_entry_rcu(sta, &local->sta_list, list) {
173 if (sdata != sta->sdata ||
174 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
177 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
180 if (!sta->sta.ht_cap.ht_supported) {
181 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
187 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
193 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
195 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
196 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
198 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
200 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
203 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
204 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
205 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
206 return BSS_CHANGED_HT;
209 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
210 struct sta_info *sta,
211 enum ieee80211_self_protected_actioncode action,
212 u8 *da, u16 llid, u16 plid, u16 reason)
214 struct ieee80211_local *local = sdata->local;
216 struct ieee80211_tx_info *info;
217 struct ieee80211_mgmt *mgmt;
218 bool include_plid = false;
219 u16 peering_proto = 0;
222 int hdr_len = offsetofend(struct ieee80211_mgmt, u.action.u.self_prot);
225 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
226 NL80211_IFTYPE_MESH_POINT);
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) +
240 2 + 1 + sizeof(struct ieee80211_he_operation) +
241 sizeof(struct ieee80211_he_6ghz_oper) +
242 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
243 2 + 8 + /* peering IE */
244 sdata->u.mesh.ie_len);
247 info = IEEE80211_SKB_CB(skb);
248 skb_reserve(skb, local->tx_headroom);
249 mgmt = skb_put_zero(skb, hdr_len);
250 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
251 IEEE80211_STYPE_ACTION);
252 memcpy(mgmt->da, da, ETH_ALEN);
253 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
254 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
255 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
256 mgmt->u.action.u.self_prot.action_code = action;
258 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
259 struct ieee80211_supported_band *sband;
260 enum nl80211_band band;
262 sband = ieee80211_get_sband(sdata);
269 /* capability info */
270 pos = skb_put_zero(skb, 2);
271 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
273 pos = skb_put(skb, 2);
274 put_unaligned_le16(sta->sta.aid, pos);
276 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
277 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
278 mesh_add_rsn_ie(sdata, skb) ||
279 mesh_add_meshid_ie(sdata, skb) ||
280 mesh_add_meshconf_ie(sdata, skb))
282 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
283 info->flags |= IEEE80211_TX_CTL_NO_ACK;
284 if (mesh_add_meshid_ie(sdata, skb))
288 /* Add Mesh Peering Management element */
290 case WLAN_SP_MESH_PEERING_OPEN:
292 case WLAN_SP_MESH_PEERING_CONFIRM:
296 case WLAN_SP_MESH_PEERING_CLOSE:
301 ie_len += 2; /* reason code */
308 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
311 pos = skb_put(skb, 2 + ie_len);
312 *pos++ = WLAN_EID_PEER_MGMT;
314 memcpy(pos, &peering_proto, 2);
316 put_unaligned_le16(llid, pos);
319 put_unaligned_le16(plid, pos);
322 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
323 put_unaligned_le16(reason, pos);
327 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
328 if (mesh_add_ht_cap_ie(sdata, skb) ||
329 mesh_add_ht_oper_ie(sdata, skb) ||
330 mesh_add_vht_cap_ie(sdata, skb) ||
331 mesh_add_vht_oper_ie(sdata, skb) ||
332 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
333 mesh_add_he_oper_ie(sdata, skb) ||
334 mesh_add_he_6ghz_cap_ie(sdata, skb))
338 if (mesh_add_vendor_ies(sdata, skb))
341 ieee80211_tx_skb(sdata, skb);
349 * __mesh_plink_deactivate - deactivate mesh peer link
351 * @sta: mesh peer link to deactivate
353 * Mesh paths with this peer as next hop should be flushed
354 * by the caller outside of plink_lock.
356 * Returns beacon changed flag if the beacon content changed.
358 * Locking: the caller must hold sta->mesh->plink_lock
360 static u32 __mesh_plink_deactivate(struct sta_info *sta)
362 struct ieee80211_sub_if_data *sdata = sta->sdata;
365 lockdep_assert_held(&sta->mesh->plink_lock);
367 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
368 changed = mesh_plink_dec_estab_count(sdata);
369 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
371 ieee80211_mps_sta_status_update(sta);
372 changed |= ieee80211_mps_set_sta_local_pm(sta,
373 NL80211_MESH_POWER_UNKNOWN);
379 * mesh_plink_deactivate - deactivate mesh peer link
381 * @sta: mesh peer link to deactivate
383 * All mesh paths with this peer as next hop will be flushed
385 u32 mesh_plink_deactivate(struct sta_info *sta)
387 struct ieee80211_sub_if_data *sdata = sta->sdata;
390 spin_lock_bh(&sta->mesh->plink_lock);
391 changed = __mesh_plink_deactivate(sta);
393 if (!sdata->u.mesh.user_mpm) {
394 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
395 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
396 sta->sta.addr, sta->mesh->llid,
397 sta->mesh->plid, sta->mesh->reason);
399 spin_unlock_bh(&sta->mesh->plink_lock);
400 if (!sdata->u.mesh.user_mpm)
401 del_timer_sync(&sta->mesh->plink_timer);
402 mesh_path_flush_by_nexthop(sta);
404 /* make sure no readers can access nexthop sta from here on */
410 static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
411 struct sta_info *sta,
412 struct ieee802_11_elems *elems)
414 struct ieee80211_local *local = sdata->local;
415 struct ieee80211_supported_band *sband;
416 u32 rates, basic_rates = 0, changed = 0;
417 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
419 sband = ieee80211_get_sband(sdata);
423 rates = ieee80211_sta_get_rates(sdata, elems, sband->band,
426 spin_lock_bh(&sta->mesh->plink_lock);
427 sta->rx_stats.last_rx = jiffies;
429 /* rates and capabilities don't change during peering */
430 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
431 sta->mesh->processed_beacon)
433 sta->mesh->processed_beacon = true;
435 if (sta->sta.supp_rates[sband->band] != rates)
436 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
437 sta->sta.supp_rates[sband->band] = rates;
439 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
440 elems->ht_cap_elem, sta))
441 changed |= IEEE80211_RC_BW_CHANGED;
443 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
444 elems->vht_cap_elem, sta);
446 ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband, elems->he_cap,
451 if (bw != sta->sta.bandwidth)
452 changed |= IEEE80211_RC_BW_CHANGED;
454 /* HT peer is operating 20MHz-only */
455 if (elems->ht_operation &&
456 !(elems->ht_operation->ht_param &
457 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
458 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
459 changed |= IEEE80211_RC_BW_CHANGED;
460 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
463 if (!test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
464 rate_control_rate_init(sta);
466 rate_control_rate_update(local, sband, sta, changed);
468 spin_unlock_bh(&sta->mesh->plink_lock);
471 static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
473 struct sta_info *sta;
474 unsigned long *aid_map;
477 aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
478 sizeof(*aid_map), GFP_KERNEL);
482 /* reserve aid 0 for mcast indication */
483 __set_bit(0, aid_map);
486 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
487 __set_bit(sta->sta.aid, aid_map);
490 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
493 if (aid > IEEE80211_MAX_AID)
499 static struct sta_info *
500 __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
502 struct sta_info *sta;
505 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
508 aid = mesh_allocate_aid(sdata);
512 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
516 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
520 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
521 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
522 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
527 static struct sta_info *
528 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
529 struct ieee802_11_elems *elems,
530 struct ieee80211_rx_status *rx_status)
532 struct sta_info *sta = NULL;
534 /* Userspace handles station allocation */
535 if (sdata->u.mesh.user_mpm ||
536 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
537 if (mesh_peer_accepts_plinks(elems) &&
538 mesh_plink_availables(sdata)) {
541 if (ieee80211_hw_check(&sdata->local->hw, SIGNAL_DBM))
542 sig = rx_status->signal;
544 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
550 sta = __mesh_sta_info_alloc(sdata, addr);
556 * mesh_sta_info_get - return mesh sta info entry for @addr.
558 * @sdata: local meshif
559 * @addr: peer's address
560 * @elems: IEs from beacon or mesh peering frame.
561 * @rx_status: rx status for the frame for signal reporting
563 * Return existing or newly allocated sta_info under RCU read lock.
564 * (re)initialize with given IEs.
566 static struct sta_info *
567 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
568 u8 *addr, struct ieee802_11_elems *elems,
569 struct ieee80211_rx_status *rx_status) __acquires(RCU)
571 struct sta_info *sta = NULL;
574 sta = sta_info_get(sdata, addr);
576 mesh_sta_info_init(sdata, sta, elems);
579 /* can't run atomic */
580 sta = mesh_sta_info_alloc(sdata, addr, elems, rx_status);
586 mesh_sta_info_init(sdata, sta, elems);
588 if (sta_info_insert_rcu(sta))
596 * mesh_neighbour_update - update or initialize new mesh neighbor.
598 * @sdata: local meshif
599 * @addr: peer's address
600 * @elems: IEs from beacon or mesh peering frame
601 * @rx_status: rx status for the frame for signal reporting
603 * Initiates peering if appropriate.
605 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
607 struct ieee802_11_elems *elems,
608 struct ieee80211_rx_status *rx_status)
610 struct sta_info *sta;
613 sta = mesh_sta_info_get(sdata, hw_addr, elems, rx_status);
617 sta->mesh->connected_to_gate = elems->mesh_config->meshconf_form &
618 IEEE80211_MESHCONF_FORM_CONNECTED_TO_GATE;
620 if (mesh_peer_accepts_plinks(elems) &&
621 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
622 sdata->u.mesh.accepting_plinks &&
623 sdata->u.mesh.mshcfg.auto_open_plinks &&
624 rssi_threshold_check(sdata, sta))
625 changed = mesh_plink_open(sta);
627 ieee80211_mps_frame_release(sta, elems);
630 ieee80211_mbss_info_change_notify(sdata, changed);
633 void mesh_plink_timer(struct timer_list *t)
635 struct mesh_sta *mesh = from_timer(mesh, t, plink_timer);
636 struct sta_info *sta;
638 struct ieee80211_sub_if_data *sdata;
639 struct mesh_config *mshcfg;
640 enum ieee80211_self_protected_actioncode action = 0;
643 * This STA is valid because sta_info_destroy() will
644 * del_timer_sync() this timer after having made sure
645 * it cannot be readded (by deleting the plink.)
647 sta = mesh->plink_sta;
649 if (sta->sdata->local->quiescing)
652 spin_lock_bh(&sta->mesh->plink_lock);
654 /* If a timer fires just before a state transition on another CPU,
655 * we may have already extended the timeout and changed state by the
656 * time we've acquired the lock and arrived here. In that case,
657 * skip this timer and wait for the new one.
659 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
661 "Ignoring timer for %pM in state %s (timer adjusted)",
662 sta->sta.addr, mplstates[sta->mesh->plink_state]);
663 spin_unlock_bh(&sta->mesh->plink_lock);
667 /* del_timer() and handler may race when entering these states */
668 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
669 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
671 "Ignoring timer for %pM in state %s (timer deleted)",
672 sta->sta.addr, mplstates[sta->mesh->plink_state]);
673 spin_unlock_bh(&sta->mesh->plink_lock);
678 "Mesh plink timer for %pM fired on state %s\n",
679 sta->sta.addr, mplstates[sta->mesh->plink_state]);
681 mshcfg = &sdata->u.mesh.mshcfg;
683 switch (sta->mesh->plink_state) {
684 case NL80211_PLINK_OPN_RCVD:
685 case NL80211_PLINK_OPN_SNT:
687 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
690 "Mesh plink for %pM (retry, timeout): %d %d\n",
691 sta->sta.addr, sta->mesh->plink_retries,
692 sta->mesh->plink_timeout);
693 get_random_bytes(&rand, sizeof(u32));
694 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
695 rand % sta->mesh->plink_timeout;
696 ++sta->mesh->plink_retries;
697 mod_plink_timer(sta, sta->mesh->plink_timeout);
698 action = WLAN_SP_MESH_PEERING_OPEN;
701 reason = WLAN_REASON_MESH_MAX_RETRIES;
703 case NL80211_PLINK_CNF_RCVD:
706 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
707 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
708 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
709 action = WLAN_SP_MESH_PEERING_CLOSE;
711 case NL80211_PLINK_HOLDING:
713 del_timer(&sta->mesh->plink_timer);
714 mesh_plink_fsm_restart(sta);
719 spin_unlock_bh(&sta->mesh->plink_lock);
721 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
722 sta->mesh->llid, sta->mesh->plid, reason);
725 static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
727 sta->mesh->plink_timeout = timeout;
728 mod_timer(&sta->mesh->plink_timer, jiffies + msecs_to_jiffies(timeout));
731 static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
734 struct ieee80211_local *local = sdata->local;
736 struct sta_info *sta;
739 list_for_each_entry_rcu(sta, &local->sta_list, list) {
740 if (sdata != sta->sdata)
743 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
753 static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
758 get_random_bytes(&llid, sizeof(llid));
759 } while (llid_in_use(sdata, llid));
764 u32 mesh_plink_open(struct sta_info *sta)
766 struct ieee80211_sub_if_data *sdata = sta->sdata;
769 if (!test_sta_flag(sta, WLAN_STA_AUTH))
772 spin_lock_bh(&sta->mesh->plink_lock);
773 sta->mesh->llid = mesh_get_new_llid(sdata);
774 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
775 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
776 spin_unlock_bh(&sta->mesh->plink_lock);
779 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
780 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
781 spin_unlock_bh(&sta->mesh->plink_lock);
783 "Mesh plink: starting establishment with %pM\n",
786 /* set the non-peer mode to active during peering */
787 changed = ieee80211_mps_local_status_update(sdata);
789 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
790 sta->sta.addr, sta->mesh->llid, 0, 0);
794 u32 mesh_plink_block(struct sta_info *sta)
798 spin_lock_bh(&sta->mesh->plink_lock);
799 changed = __mesh_plink_deactivate(sta);
800 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
801 spin_unlock_bh(&sta->mesh->plink_lock);
802 mesh_path_flush_by_nexthop(sta);
807 static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
808 struct sta_info *sta,
809 enum plink_event event)
811 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
812 u16 reason = (event == CLS_ACPT) ?
813 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
815 sta->mesh->reason = reason;
816 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
817 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
820 static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
821 struct sta_info *sta)
823 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
826 del_timer(&sta->mesh->plink_timer);
827 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
828 changed |= mesh_plink_inc_estab_count(sdata);
829 changed |= mesh_set_ht_prot_mode(sdata);
830 changed |= mesh_set_short_slot_time(sdata);
831 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
832 ieee80211_mps_sta_status_update(sta);
833 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
838 * mesh_plink_fsm - step @sta MPM based on @event
841 * @sta: mesh neighbor
842 * @event: peering event
844 * Return: changed MBSS flags
846 static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
847 struct sta_info *sta, enum plink_event event)
849 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
850 enum ieee80211_self_protected_actioncode action = 0;
854 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
855 mplstates[sta->mesh->plink_state], mplevents[event]);
857 spin_lock_bh(&sta->mesh->plink_lock);
858 switch (sta->mesh->plink_state) {
859 case NL80211_PLINK_LISTEN:
862 mesh_plink_fsm_restart(sta);
865 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
866 sta->mesh->llid = mesh_get_new_llid(sdata);
867 mesh_plink_timer_set(sta,
868 mshcfg->dot11MeshRetryTimeout);
870 /* set the non-peer mode to active during peering */
871 changed |= ieee80211_mps_local_status_update(sdata);
872 action = WLAN_SP_MESH_PEERING_OPEN;
878 case NL80211_PLINK_OPN_SNT:
883 mesh_plink_close(sdata, sta, event);
884 action = WLAN_SP_MESH_PEERING_CLOSE;
887 /* retry timer is left untouched */
888 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
889 action = WLAN_SP_MESH_PEERING_CONFIRM;
892 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
893 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
899 case NL80211_PLINK_OPN_RCVD:
904 mesh_plink_close(sdata, sta, event);
905 action = WLAN_SP_MESH_PEERING_CLOSE;
908 action = WLAN_SP_MESH_PEERING_CONFIRM;
911 changed |= mesh_plink_establish(sdata, sta);
917 case NL80211_PLINK_CNF_RCVD:
922 mesh_plink_close(sdata, sta, event);
923 action = WLAN_SP_MESH_PEERING_CLOSE;
926 changed |= mesh_plink_establish(sdata, sta);
927 action = WLAN_SP_MESH_PEERING_CONFIRM;
933 case NL80211_PLINK_ESTAB:
936 changed |= __mesh_plink_deactivate(sta);
937 changed |= mesh_set_ht_prot_mode(sdata);
938 changed |= mesh_set_short_slot_time(sdata);
939 mesh_plink_close(sdata, sta, event);
940 action = WLAN_SP_MESH_PEERING_CLOSE;
944 action = WLAN_SP_MESH_PEERING_CONFIRM;
950 case NL80211_PLINK_HOLDING:
953 del_timer(&sta->mesh->plink_timer);
954 mesh_plink_fsm_restart(sta);
960 action = WLAN_SP_MESH_PEERING_CLOSE;
967 /* should not get here, PLINK_BLOCKED is dealt with at the
968 * beginning of the function
972 spin_unlock_bh(&sta->mesh->plink_lock);
974 mesh_path_flush_by_nexthop(sta);
976 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
977 sta->mesh->llid, sta->mesh->plid,
980 /* also send confirm in open case */
981 if (action == WLAN_SP_MESH_PEERING_OPEN) {
982 mesh_plink_frame_tx(sdata, sta,
983 WLAN_SP_MESH_PEERING_CONFIRM,
984 sta->sta.addr, sta->mesh->llid,
993 * mesh_plink_get_event - get correct MPM event
996 * @sta: peer, leave NULL if processing a frame from a new suitable peer
997 * @elems: peering management IEs
999 * @llid: peer's peer link ID
1000 * @plid: peer's local link ID
1002 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
1005 static enum plink_event
1006 mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
1007 struct sta_info *sta,
1008 struct ieee802_11_elems *elems,
1009 enum ieee80211_self_protected_actioncode ftype,
1012 enum plink_event event = PLINK_UNDEFINED;
1013 u8 ie_len = elems->peering_len;
1016 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
1017 mesh_matches_local(sdata, elems));
1019 /* deny open request from non-matching peer */
1020 if (!matches_local && !sta) {
1026 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1027 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1030 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1031 if (!mesh_plink_free_count(sdata)) {
1032 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1036 /* new matching peer */
1040 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1041 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1044 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
1049 case WLAN_SP_MESH_PEERING_OPEN:
1052 if (!mesh_plink_free_count(sdata) ||
1053 (sta->mesh->plid && sta->mesh->plid != plid))
1058 case WLAN_SP_MESH_PEERING_CONFIRM:
1061 if (!mesh_plink_free_count(sdata) ||
1062 sta->mesh->llid != llid ||
1063 (sta->mesh->plid && sta->mesh->plid != plid))
1068 case WLAN_SP_MESH_PEERING_CLOSE:
1069 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
1070 /* Do not check for llid or plid. This does not
1071 * follow the standard but since multiple plinks
1072 * per sta are not supported, it is necessary in
1073 * order to avoid a livelock when MP A sees an
1074 * establish peer link to MP B but MP B does not
1075 * see it. This can be caused by a timeout in
1076 * B's peer link establishment or B beign
1080 else if (sta->mesh->plid != plid)
1082 else if (ie_len == 8 && sta->mesh->llid != llid)
1088 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1097 mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1098 struct ieee80211_mgmt *mgmt,
1099 struct ieee802_11_elems *elems,
1100 struct ieee80211_rx_status *rx_status)
1103 struct sta_info *sta;
1104 enum plink_event event;
1105 enum ieee80211_self_protected_actioncode ftype;
1107 u8 ie_len = elems->peering_len;
1110 if (!elems->peering) {
1112 "Mesh plink: missing necessary peer link ie\n");
1116 if (elems->rsn_len &&
1117 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1119 "Mesh plink: can't establish link with secure peer\n");
1123 ftype = mgmt->u.action.u.self_prot.action_code;
1124 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1125 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1126 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1129 "Mesh plink: incorrect plink ie length %d %d\n",
1134 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1135 (!elems->mesh_id || !elems->mesh_config)) {
1136 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1139 /* Note the lines below are correct, the llid in the frame is the plid
1140 * from the point of view of this host.
1142 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
1143 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1144 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1145 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
1147 /* WARNING: Only for sta pointer, is dropped & re-acquired */
1150 sta = sta_info_get(sdata, mgmt->sa);
1152 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1153 !rssi_threshold_check(sdata, sta)) {
1154 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1159 /* Now we will figure out the appropriate event... */
1160 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1162 if (event == OPN_ACPT) {
1164 /* allocate sta entry if necessary and update info */
1165 sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status);
1167 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1170 sta->mesh->plid = plid;
1171 } else if (!sta && event == OPN_RJCT) {
1172 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
1174 WLAN_REASON_MESH_CONFIG);
1176 } else if (!sta || event == PLINK_UNDEFINED) {
1177 /* something went wrong */
1181 if (event == CNF_ACPT) {
1182 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1183 if (!sta->mesh->plid)
1184 sta->mesh->plid = plid;
1186 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1189 changed |= mesh_plink_fsm(sdata, sta, event);
1195 ieee80211_mbss_info_change_notify(sdata, changed);
1198 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1199 struct ieee80211_mgmt *mgmt, size_t len,
1200 struct ieee80211_rx_status *rx_status)
1202 struct ieee802_11_elems elems;
1206 /* need action_code, aux */
1207 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1210 if (sdata->u.mesh.user_mpm)
1211 /* userspace must register for these */
1214 if (is_multicast_ether_addr(mgmt->da)) {
1216 "Mesh plink: ignore frame from multicast address\n");
1220 baseaddr = mgmt->u.action.u.self_prot.variable;
1221 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1222 if (mgmt->u.action.u.self_prot.action_code ==
1223 WLAN_SP_MESH_PEERING_CONFIRM) {
1230 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems,
1232 mesh_process_plink_frame(sdata, mgmt, &elems, rx_status);