1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2008, 2009 open80211s Ltd.
4 * Copyright (C) 2019, 2021-2023 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->deflink.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 u64 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
95 struct ieee80211_local *local = sdata->local;
96 struct ieee80211_supported_band *sband;
101 bool short_slot = false;
103 sband = ieee80211_get_sband(sdata);
107 if (sband->band == NL80211_BAND_5GHZ) {
108 /* (IEEE 802.11-2012 19.4.5) */
111 } else if (sband->band != NL80211_BAND_2GHZ) {
115 for (i = 0; i < sband->n_bitrates; i++)
116 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
123 list_for_each_entry_rcu(sta, &local->sta_list, list) {
124 if (sdata != sta->sdata ||
125 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
129 if (erp_rates & sta->sta.deflink.supp_rates[sband->band])
137 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
138 sdata->vif.bss_conf.use_short_slot = short_slot;
139 changed = BSS_CHANGED_ERP_SLOT;
140 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
141 sdata->vif.addr, short_slot);
147 * mesh_set_ht_prot_mode - set correct HT protection mode
148 * @sdata: the (mesh) interface to handle
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 at least one
155 * HT20 peer is present. Otherwise no-protection mode is selected.
157 * Returns: BSS_CHANGED_HT or 0 for no change
159 static u64 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
161 struct ieee80211_local *local = sdata->local;
162 struct sta_info *sta;
164 bool non_ht_sta = false, ht20_sta = false;
166 switch (sdata->vif.bss_conf.chandef.width) {
167 case NL80211_CHAN_WIDTH_20_NOHT:
168 case NL80211_CHAN_WIDTH_5:
169 case NL80211_CHAN_WIDTH_10:
176 list_for_each_entry_rcu(sta, &local->sta_list, list) {
177 if (sdata != sta->sdata ||
178 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
181 if (sta->sta.deflink.bandwidth > IEEE80211_STA_RX_BW_20)
184 if (!sta->sta.deflink.ht_cap.ht_supported) {
185 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
191 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
197 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
199 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
200 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
202 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
204 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
207 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
208 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
209 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
210 return BSS_CHANGED_HT;
213 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
214 struct sta_info *sta,
215 enum ieee80211_self_protected_actioncode action,
216 u8 *da, u16 llid, u16 plid, u16 reason)
218 struct ieee80211_local *local = sdata->local;
220 struct ieee80211_tx_info *info;
221 struct ieee80211_mgmt *mgmt;
222 bool include_plid = false;
223 u16 peering_proto = 0;
225 u8 ie_len_he_cap, ie_len_eht_cap;
226 int hdr_len = offsetofend(struct ieee80211_mgmt, u.action.u.self_prot);
229 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
230 NL80211_IFTYPE_MESH_POINT);
231 ie_len_eht_cap = ieee80211_ie_len_eht_cap(sdata,
232 NL80211_IFTYPE_MESH_POINT);
233 skb = dev_alloc_skb(local->tx_headroom +
235 2 + /* capability info */
237 2 + 8 + /* supported rates */
238 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
239 2 + sdata->u.mesh.mesh_id_len +
240 2 + sizeof(struct ieee80211_meshconf_ie) +
241 2 + sizeof(struct ieee80211_ht_cap) +
242 2 + sizeof(struct ieee80211_ht_operation) +
243 2 + sizeof(struct ieee80211_vht_cap) +
244 2 + sizeof(struct ieee80211_vht_operation) +
246 2 + 1 + sizeof(struct ieee80211_he_operation) +
247 sizeof(struct ieee80211_he_6ghz_oper) +
248 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
250 2 + 1 + offsetof(struct ieee80211_eht_operation, optional) +
251 offsetof(struct ieee80211_eht_operation_info, optional) +
252 2 + 8 + /* peering IE */
253 sdata->u.mesh.ie_len);
256 info = IEEE80211_SKB_CB(skb);
257 skb_reserve(skb, local->tx_headroom);
258 mgmt = skb_put_zero(skb, hdr_len);
259 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
260 IEEE80211_STYPE_ACTION);
261 memcpy(mgmt->da, da, ETH_ALEN);
262 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
263 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
264 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
265 mgmt->u.action.u.self_prot.action_code = action;
267 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
268 struct ieee80211_supported_band *sband;
269 enum nl80211_band band;
271 sband = ieee80211_get_sband(sdata);
278 /* capability info */
279 pos = skb_put_zero(skb, 2);
280 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
282 pos = skb_put(skb, 2);
283 put_unaligned_le16(sta->sta.aid, pos);
285 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
286 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
287 mesh_add_rsn_ie(sdata, skb) ||
288 mesh_add_meshid_ie(sdata, skb) ||
289 mesh_add_meshconf_ie(sdata, skb))
291 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
292 info->flags |= IEEE80211_TX_CTL_NO_ACK;
293 if (mesh_add_meshid_ie(sdata, skb))
297 /* Add Mesh Peering Management element */
299 case WLAN_SP_MESH_PEERING_OPEN:
301 case WLAN_SP_MESH_PEERING_CONFIRM:
305 case WLAN_SP_MESH_PEERING_CLOSE:
310 ie_len += 2; /* reason code */
317 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
320 pos = skb_put(skb, 2 + ie_len);
321 *pos++ = WLAN_EID_PEER_MGMT;
323 memcpy(pos, &peering_proto, 2);
325 put_unaligned_le16(llid, pos);
328 put_unaligned_le16(plid, pos);
331 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
332 put_unaligned_le16(reason, pos);
336 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
337 if (mesh_add_ht_cap_ie(sdata, skb) ||
338 mesh_add_ht_oper_ie(sdata, skb) ||
339 mesh_add_vht_cap_ie(sdata, skb) ||
340 mesh_add_vht_oper_ie(sdata, skb) ||
341 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
342 mesh_add_he_oper_ie(sdata, skb) ||
343 mesh_add_he_6ghz_cap_ie(sdata, skb) ||
344 mesh_add_eht_cap_ie(sdata, skb, ie_len_eht_cap) ||
345 mesh_add_eht_oper_ie(sdata, skb))
349 if (mesh_add_vendor_ies(sdata, skb))
352 ieee80211_tx_skb(sdata, skb);
360 * __mesh_plink_deactivate - deactivate mesh peer link
362 * @sta: mesh peer link to deactivate
364 * Mesh paths with this peer as next hop should be flushed
365 * by the caller outside of plink_lock.
367 * Returns: beacon changed flag if the beacon content changed.
369 * Locking: the caller must hold sta->mesh->plink_lock
371 static u64 __mesh_plink_deactivate(struct sta_info *sta)
373 struct ieee80211_sub_if_data *sdata = sta->sdata;
376 lockdep_assert_held(&sta->mesh->plink_lock);
378 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
379 changed = mesh_plink_dec_estab_count(sdata);
380 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
382 ieee80211_mps_sta_status_update(sta);
383 changed |= ieee80211_mps_set_sta_local_pm(sta,
384 NL80211_MESH_POWER_UNKNOWN);
390 * mesh_plink_deactivate - deactivate mesh peer link
392 * @sta: mesh peer link to deactivate
394 * All mesh paths with this peer as next hop will be flushed
396 * Returns: beacon changed flag if the beacon content changed.
398 u64 mesh_plink_deactivate(struct sta_info *sta)
400 struct ieee80211_sub_if_data *sdata = sta->sdata;
403 spin_lock_bh(&sta->mesh->plink_lock);
404 changed = __mesh_plink_deactivate(sta);
406 if (!sdata->u.mesh.user_mpm) {
407 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
408 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
409 sta->sta.addr, sta->mesh->llid,
410 sta->mesh->plid, sta->mesh->reason);
412 spin_unlock_bh(&sta->mesh->plink_lock);
413 if (!sdata->u.mesh.user_mpm)
414 del_timer_sync(&sta->mesh->plink_timer);
415 mesh_path_flush_by_nexthop(sta);
417 /* make sure no readers can access nexthop sta from here on */
423 static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
424 struct sta_info *sta,
425 struct ieee802_11_elems *elems)
427 struct ieee80211_local *local = sdata->local;
428 struct ieee80211_supported_band *sband;
429 u32 rates, basic_rates = 0, changed = 0;
430 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
432 sband = ieee80211_get_sband(sdata);
436 rates = ieee80211_sta_get_rates(sdata, elems, sband->band,
439 spin_lock_bh(&sta->mesh->plink_lock);
440 sta->deflink.rx_stats.last_rx = jiffies;
442 /* rates and capabilities don't change during peering */
443 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
444 sta->mesh->processed_beacon)
446 sta->mesh->processed_beacon = true;
448 if (sta->sta.deflink.supp_rates[sband->band] != rates)
449 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
450 sta->sta.deflink.supp_rates[sband->band] = rates;
452 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
455 changed |= IEEE80211_RC_BW_CHANGED;
457 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
458 elems->vht_cap_elem, NULL,
461 ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband, elems->he_cap,
466 ieee80211_eht_cap_ie_to_sta_eht_cap(sdata, sband, elems->he_cap,
468 elems->eht_cap, elems->eht_cap_len,
471 if (bw != sta->sta.deflink.bandwidth)
472 changed |= IEEE80211_RC_BW_CHANGED;
474 /* HT peer is operating 20MHz-only */
475 if (elems->ht_operation &&
476 !(elems->ht_operation->ht_param &
477 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
478 if (sta->sta.deflink.bandwidth != IEEE80211_STA_RX_BW_20)
479 changed |= IEEE80211_RC_BW_CHANGED;
480 sta->sta.deflink.bandwidth = IEEE80211_STA_RX_BW_20;
483 if (!test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
484 rate_control_rate_init(sta);
486 rate_control_rate_update(local, sband, sta, 0, changed);
488 spin_unlock_bh(&sta->mesh->plink_lock);
491 static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
493 struct sta_info *sta;
494 unsigned long *aid_map;
497 aid_map = bitmap_zalloc(IEEE80211_MAX_AID + 1, GFP_KERNEL);
501 /* reserve aid 0 for mcast indication */
502 __set_bit(0, aid_map);
505 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
506 __set_bit(sta->sta.aid, aid_map);
509 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
510 bitmap_free(aid_map);
512 if (aid > IEEE80211_MAX_AID)
518 static struct sta_info *
519 __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
521 struct sta_info *sta;
524 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
527 aid = mesh_allocate_aid(sdata);
531 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
535 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
539 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
540 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
541 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
546 static struct sta_info *
547 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
548 struct ieee802_11_elems *elems,
549 struct ieee80211_rx_status *rx_status)
551 struct sta_info *sta = NULL;
553 /* Userspace handles station allocation */
554 if (sdata->u.mesh.user_mpm ||
555 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
556 if (mesh_peer_accepts_plinks(elems) &&
557 mesh_plink_availables(sdata)) {
560 if (ieee80211_hw_check(&sdata->local->hw, SIGNAL_DBM))
561 sig = rx_status->signal;
563 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
569 sta = __mesh_sta_info_alloc(sdata, addr);
575 * mesh_sta_info_get - return mesh sta info entry for @addr.
577 * @sdata: local meshif
578 * @addr: peer's address
579 * @elems: IEs from beacon or mesh peering frame.
580 * @rx_status: rx status for the frame for signal reporting
582 * Return existing or newly allocated sta_info under RCU read lock.
583 * (re)initialize with given IEs.
585 static struct sta_info *
586 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
587 u8 *addr, struct ieee802_11_elems *elems,
588 struct ieee80211_rx_status *rx_status) __acquires(RCU)
590 struct sta_info *sta = NULL;
593 sta = sta_info_get(sdata, addr);
595 mesh_sta_info_init(sdata, sta, elems);
598 /* can't run atomic */
599 sta = mesh_sta_info_alloc(sdata, addr, elems, rx_status);
605 mesh_sta_info_init(sdata, sta, elems);
607 if (sta_info_insert_rcu(sta))
615 * mesh_neighbour_update - update or initialize new mesh neighbor.
617 * @sdata: local meshif
618 * @addr: peer's address
619 * @elems: IEs from beacon or mesh peering frame
620 * @rx_status: rx status for the frame for signal reporting
622 * Initiates peering if appropriate.
624 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
626 struct ieee802_11_elems *elems,
627 struct ieee80211_rx_status *rx_status)
629 struct sta_info *sta;
632 sta = mesh_sta_info_get(sdata, hw_addr, elems, rx_status);
636 sta->mesh->connected_to_gate = elems->mesh_config->meshconf_form &
637 IEEE80211_MESHCONF_FORM_CONNECTED_TO_GATE;
639 if (mesh_peer_accepts_plinks(elems) &&
640 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
641 sdata->u.mesh.accepting_plinks &&
642 sdata->u.mesh.mshcfg.auto_open_plinks &&
643 rssi_threshold_check(sdata, sta))
644 changed = mesh_plink_open(sta);
646 ieee80211_mps_frame_release(sta, elems);
649 ieee80211_mbss_info_change_notify(sdata, changed);
652 void mesh_plink_timer(struct timer_list *t)
654 struct mesh_sta *mesh = from_timer(mesh, t, plink_timer);
655 struct sta_info *sta;
657 struct ieee80211_sub_if_data *sdata;
658 struct mesh_config *mshcfg;
659 enum ieee80211_self_protected_actioncode action = 0;
662 * This STA is valid because sta_info_destroy() will
663 * del_timer_sync() this timer after having made sure
664 * it cannot be readded (by deleting the plink.)
666 sta = mesh->plink_sta;
668 if (sta->sdata->local->quiescing)
671 spin_lock_bh(&sta->mesh->plink_lock);
673 /* If a timer fires just before a state transition on another CPU,
674 * we may have already extended the timeout and changed state by the
675 * time we've acquired the lock and arrived here. In that case,
676 * skip this timer and wait for the new one.
678 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
680 "Ignoring timer for %pM in state %s (timer adjusted)",
681 sta->sta.addr, mplstates[sta->mesh->plink_state]);
682 spin_unlock_bh(&sta->mesh->plink_lock);
686 /* del_timer() and handler may race when entering these states */
687 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
688 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
690 "Ignoring timer for %pM in state %s (timer deleted)",
691 sta->sta.addr, mplstates[sta->mesh->plink_state]);
692 spin_unlock_bh(&sta->mesh->plink_lock);
697 "Mesh plink timer for %pM fired on state %s\n",
698 sta->sta.addr, mplstates[sta->mesh->plink_state]);
700 mshcfg = &sdata->u.mesh.mshcfg;
702 switch (sta->mesh->plink_state) {
703 case NL80211_PLINK_OPN_RCVD:
704 case NL80211_PLINK_OPN_SNT:
706 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
709 "Mesh plink for %pM (retry, timeout): %d %d\n",
710 sta->sta.addr, sta->mesh->plink_retries,
711 sta->mesh->plink_timeout);
712 get_random_bytes(&rand, sizeof(u32));
713 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
714 rand % sta->mesh->plink_timeout;
715 ++sta->mesh->plink_retries;
716 mod_plink_timer(sta, sta->mesh->plink_timeout);
717 action = WLAN_SP_MESH_PEERING_OPEN;
720 reason = WLAN_REASON_MESH_MAX_RETRIES;
722 case NL80211_PLINK_CNF_RCVD:
725 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
726 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
727 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
728 action = WLAN_SP_MESH_PEERING_CLOSE;
730 case NL80211_PLINK_HOLDING:
732 del_timer(&sta->mesh->plink_timer);
733 mesh_plink_fsm_restart(sta);
738 spin_unlock_bh(&sta->mesh->plink_lock);
740 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
741 sta->mesh->llid, sta->mesh->plid, reason);
744 static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
746 sta->mesh->plink_timeout = timeout;
747 mod_timer(&sta->mesh->plink_timer, jiffies + msecs_to_jiffies(timeout));
750 static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
753 struct ieee80211_local *local = sdata->local;
755 struct sta_info *sta;
758 list_for_each_entry_rcu(sta, &local->sta_list, list) {
759 if (sdata != sta->sdata)
762 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
772 static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
777 get_random_bytes(&llid, sizeof(llid));
778 } while (llid_in_use(sdata, llid));
783 u64 mesh_plink_open(struct sta_info *sta)
785 struct ieee80211_sub_if_data *sdata = sta->sdata;
788 if (!test_sta_flag(sta, WLAN_STA_AUTH))
791 spin_lock_bh(&sta->mesh->plink_lock);
792 sta->mesh->llid = mesh_get_new_llid(sdata);
793 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
794 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
795 spin_unlock_bh(&sta->mesh->plink_lock);
798 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
799 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
800 spin_unlock_bh(&sta->mesh->plink_lock);
802 "Mesh plink: starting establishment with %pM\n",
805 /* set the non-peer mode to active during peering */
806 changed = ieee80211_mps_local_status_update(sdata);
808 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
809 sta->sta.addr, sta->mesh->llid, 0, 0);
813 u64 mesh_plink_block(struct sta_info *sta)
817 spin_lock_bh(&sta->mesh->plink_lock);
818 changed = __mesh_plink_deactivate(sta);
819 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
820 spin_unlock_bh(&sta->mesh->plink_lock);
821 mesh_path_flush_by_nexthop(sta);
826 static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
827 struct sta_info *sta,
828 enum plink_event event)
830 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
831 u16 reason = (event == CLS_ACPT) ?
832 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
834 sta->mesh->reason = reason;
835 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
836 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
839 static u64 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
840 struct sta_info *sta)
842 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
845 del_timer(&sta->mesh->plink_timer);
846 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
847 changed |= mesh_plink_inc_estab_count(sdata);
848 changed |= mesh_set_ht_prot_mode(sdata);
849 changed |= mesh_set_short_slot_time(sdata);
850 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
851 ieee80211_mps_sta_status_update(sta);
852 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
857 * mesh_plink_fsm - step @sta MPM based on @event
860 * @sta: mesh neighbor
861 * @event: peering event
863 * Return: changed MBSS flags
865 static u64 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
866 struct sta_info *sta, enum plink_event event)
868 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
869 enum ieee80211_self_protected_actioncode action = 0;
873 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
874 mplstates[sta->mesh->plink_state], mplevents[event]);
876 spin_lock_bh(&sta->mesh->plink_lock);
877 switch (sta->mesh->plink_state) {
878 case NL80211_PLINK_LISTEN:
881 mesh_plink_fsm_restart(sta);
884 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
885 sta->mesh->llid = mesh_get_new_llid(sdata);
886 mesh_plink_timer_set(sta,
887 mshcfg->dot11MeshRetryTimeout);
889 /* set the non-peer mode to active during peering */
890 changed |= ieee80211_mps_local_status_update(sdata);
891 action = WLAN_SP_MESH_PEERING_OPEN;
897 case NL80211_PLINK_OPN_SNT:
902 mesh_plink_close(sdata, sta, event);
903 action = WLAN_SP_MESH_PEERING_CLOSE;
906 /* retry timer is left untouched */
907 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
908 action = WLAN_SP_MESH_PEERING_CONFIRM;
911 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
912 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
918 case NL80211_PLINK_OPN_RCVD:
923 mesh_plink_close(sdata, sta, event);
924 action = WLAN_SP_MESH_PEERING_CLOSE;
927 action = WLAN_SP_MESH_PEERING_CONFIRM;
930 changed |= mesh_plink_establish(sdata, sta);
936 case NL80211_PLINK_CNF_RCVD:
941 mesh_plink_close(sdata, sta, event);
942 action = WLAN_SP_MESH_PEERING_CLOSE;
945 changed |= mesh_plink_establish(sdata, sta);
946 action = WLAN_SP_MESH_PEERING_CONFIRM;
952 case NL80211_PLINK_ESTAB:
955 changed |= __mesh_plink_deactivate(sta);
956 changed |= mesh_set_ht_prot_mode(sdata);
957 changed |= mesh_set_short_slot_time(sdata);
958 mesh_plink_close(sdata, sta, event);
959 action = WLAN_SP_MESH_PEERING_CLOSE;
963 action = WLAN_SP_MESH_PEERING_CONFIRM;
969 case NL80211_PLINK_HOLDING:
972 del_timer(&sta->mesh->plink_timer);
973 mesh_plink_fsm_restart(sta);
979 action = WLAN_SP_MESH_PEERING_CLOSE;
986 /* should not get here, PLINK_BLOCKED is dealt with at the
987 * beginning of the function
991 spin_unlock_bh(&sta->mesh->plink_lock);
993 mesh_path_flush_by_nexthop(sta);
995 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
996 sta->mesh->llid, sta->mesh->plid,
999 /* also send confirm in open case */
1000 if (action == WLAN_SP_MESH_PEERING_OPEN) {
1001 mesh_plink_frame_tx(sdata, sta,
1002 WLAN_SP_MESH_PEERING_CONFIRM,
1003 sta->sta.addr, sta->mesh->llid,
1004 sta->mesh->plid, 0);
1012 * mesh_plink_get_event - get correct MPM event
1015 * @sta: peer, leave NULL if processing a frame from a new suitable peer
1016 * @elems: peering management IEs
1017 * @ftype: frame type
1018 * @llid: peer's peer link ID
1019 * @plid: peer's local link ID
1021 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
1024 static enum plink_event
1025 mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
1026 struct sta_info *sta,
1027 struct ieee802_11_elems *elems,
1028 enum ieee80211_self_protected_actioncode ftype,
1031 enum plink_event event = PLINK_UNDEFINED;
1032 u8 ie_len = elems->peering_len;
1035 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
1036 mesh_matches_local(sdata, elems));
1038 /* deny open request from non-matching peer */
1039 if (!matches_local && !sta) {
1045 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1046 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1049 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1050 if (!mesh_plink_free_count(sdata)) {
1051 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1055 /* new matching peer */
1059 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1060 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1063 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
1068 case WLAN_SP_MESH_PEERING_OPEN:
1071 else if (!mesh_plink_free_count(sdata) ||
1072 (sta->mesh->plid && sta->mesh->plid != plid))
1077 case WLAN_SP_MESH_PEERING_CONFIRM:
1080 else if (!mesh_plink_free_count(sdata) ||
1081 sta->mesh->llid != llid ||
1082 (sta->mesh->plid && sta->mesh->plid != plid))
1087 case WLAN_SP_MESH_PEERING_CLOSE:
1088 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
1089 /* Do not check for llid or plid. This does not
1090 * follow the standard but since multiple plinks
1091 * per sta are not supported, it is necessary in
1092 * order to avoid a livelock when MP A sees an
1093 * establish peer link to MP B but MP B does not
1094 * see it. This can be caused by a timeout in
1095 * B's peer link establishment or B beign
1099 else if (sta->mesh->plid != plid)
1101 else if (ie_len == 8 && sta->mesh->llid != llid)
1107 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1116 mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1117 struct ieee80211_mgmt *mgmt,
1118 struct ieee802_11_elems *elems,
1119 struct ieee80211_rx_status *rx_status)
1122 struct sta_info *sta;
1123 enum plink_event event;
1124 enum ieee80211_self_protected_actioncode ftype;
1126 u8 ie_len = elems->peering_len;
1129 if (!elems->peering) {
1131 "Mesh plink: missing necessary peer link ie\n");
1135 if (elems->rsn_len &&
1136 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1138 "Mesh plink: can't establish link with secure peer\n");
1142 ftype = mgmt->u.action.u.self_prot.action_code;
1143 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1144 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1145 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1148 "Mesh plink: incorrect plink ie length %d %d\n",
1153 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1154 (!elems->mesh_id || !elems->mesh_config)) {
1155 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1158 /* Note the lines below are correct, the llid in the frame is the plid
1159 * from the point of view of this host.
1161 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
1162 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1163 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1164 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
1166 /* WARNING: Only for sta pointer, is dropped & re-acquired */
1169 sta = sta_info_get(sdata, mgmt->sa);
1171 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1172 !rssi_threshold_check(sdata, sta)) {
1173 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1178 /* Now we will figure out the appropriate event... */
1179 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1181 if (event == OPN_ACPT) {
1183 /* allocate sta entry if necessary and update info */
1184 sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status);
1186 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1189 sta->mesh->plid = plid;
1190 } else if (!sta && event == OPN_RJCT) {
1191 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
1193 WLAN_REASON_MESH_CONFIG);
1195 } else if (!sta || event == PLINK_UNDEFINED) {
1196 /* something went wrong */
1200 if (event == CNF_ACPT) {
1201 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1202 if (!sta->mesh->plid)
1203 sta->mesh->plid = plid;
1205 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1208 changed |= mesh_plink_fsm(sdata, sta, event);
1214 ieee80211_mbss_info_change_notify(sdata, changed);
1217 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1218 struct ieee80211_mgmt *mgmt, size_t len,
1219 struct ieee80211_rx_status *rx_status)
1221 struct ieee802_11_elems *elems;
1225 /* need action_code, aux */
1226 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1229 if (sdata->u.mesh.user_mpm)
1230 /* userspace must register for these */
1233 if (is_multicast_ether_addr(mgmt->da)) {
1235 "Mesh plink: ignore frame from multicast address\n");
1239 baseaddr = mgmt->u.action.u.self_prot.variable;
1240 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1241 if (mgmt->u.action.u.self_prot.action_code ==
1242 WLAN_SP_MESH_PEERING_CONFIRM) {
1249 elems = ieee802_11_parse_elems(baseaddr, len - baselen, true, NULL);
1251 mesh_process_plink_frame(sdata, mgmt, elems, rx_status);