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(skb, 2);
269 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
271 pos = skb_put(skb, 2);
272 put_unaligned_le16(sta->sta.aid, pos);
274 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
275 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
276 mesh_add_rsn_ie(sdata, skb) ||
277 mesh_add_meshid_ie(sdata, skb) ||
278 mesh_add_meshconf_ie(sdata, skb))
280 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
281 info->flags |= IEEE80211_TX_CTL_NO_ACK;
282 if (mesh_add_meshid_ie(sdata, skb))
286 /* Add Mesh Peering Management element */
288 case WLAN_SP_MESH_PEERING_OPEN:
290 case WLAN_SP_MESH_PEERING_CONFIRM:
294 case WLAN_SP_MESH_PEERING_CLOSE:
299 ie_len += 2; /* reason code */
306 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
309 pos = skb_put(skb, 2 + ie_len);
310 *pos++ = WLAN_EID_PEER_MGMT;
312 memcpy(pos, &peering_proto, 2);
314 put_unaligned_le16(llid, pos);
317 put_unaligned_le16(plid, pos);
320 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
321 put_unaligned_le16(reason, pos);
325 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
326 if (mesh_add_ht_cap_ie(sdata, skb) ||
327 mesh_add_ht_oper_ie(sdata, skb) ||
328 mesh_add_vht_cap_ie(sdata, skb) ||
329 mesh_add_vht_oper_ie(sdata, skb))
333 if (mesh_add_vendor_ies(sdata, skb))
336 ieee80211_tx_skb(sdata, skb);
344 * __mesh_plink_deactivate - deactivate mesh peer link
346 * @sta: mesh peer link to deactivate
348 * Mesh paths with this peer as next hop should be flushed
349 * by the caller outside of plink_lock.
351 * Returns beacon changed flag if the beacon content changed.
353 * Locking: the caller must hold sta->mesh->plink_lock
355 static u32 __mesh_plink_deactivate(struct sta_info *sta)
357 struct ieee80211_sub_if_data *sdata = sta->sdata;
360 lockdep_assert_held(&sta->mesh->plink_lock);
362 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
363 changed = mesh_plink_dec_estab_count(sdata);
364 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
366 ieee80211_mps_sta_status_update(sta);
367 changed |= ieee80211_mps_set_sta_local_pm(sta,
368 NL80211_MESH_POWER_UNKNOWN);
374 * mesh_plink_deactivate - deactivate mesh peer link
376 * @sta: mesh peer link to deactivate
378 * All mesh paths with this peer as next hop will be flushed
380 u32 mesh_plink_deactivate(struct sta_info *sta)
382 struct ieee80211_sub_if_data *sdata = sta->sdata;
385 spin_lock_bh(&sta->mesh->plink_lock);
386 changed = __mesh_plink_deactivate(sta);
388 if (!sdata->u.mesh.user_mpm) {
389 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
390 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
391 sta->sta.addr, sta->mesh->llid,
392 sta->mesh->plid, sta->mesh->reason);
394 spin_unlock_bh(&sta->mesh->plink_lock);
395 if (!sdata->u.mesh.user_mpm)
396 del_timer_sync(&sta->mesh->plink_timer);
397 mesh_path_flush_by_nexthop(sta);
399 /* make sure no readers can access nexthop sta from here on */
405 static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
406 struct sta_info *sta,
407 struct ieee802_11_elems *elems, bool insert)
409 struct ieee80211_local *local = sdata->local;
410 struct ieee80211_supported_band *sband;
411 u32 rates, basic_rates = 0, changed = 0;
412 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
414 sband = ieee80211_get_sband(sdata);
418 rates = ieee80211_sta_get_rates(sdata, elems, sband->band,
421 spin_lock_bh(&sta->mesh->plink_lock);
422 sta->rx_stats.last_rx = jiffies;
424 /* rates and capabilities don't change during peering */
425 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
426 sta->mesh->processed_beacon)
428 sta->mesh->processed_beacon = true;
430 if (sta->sta.supp_rates[sband->band] != rates)
431 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
432 sta->sta.supp_rates[sband->band] = rates;
434 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
435 elems->ht_cap_elem, sta))
436 changed |= IEEE80211_RC_BW_CHANGED;
438 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
439 elems->vht_cap_elem, sta);
441 if (bw != sta->sta.bandwidth)
442 changed |= IEEE80211_RC_BW_CHANGED;
444 /* HT peer is operating 20MHz-only */
445 if (elems->ht_operation &&
446 !(elems->ht_operation->ht_param &
447 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
448 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
449 changed |= IEEE80211_RC_BW_CHANGED;
450 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
454 rate_control_rate_init(sta);
456 rate_control_rate_update(local, sband, sta, changed);
458 spin_unlock_bh(&sta->mesh->plink_lock);
461 static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
463 struct sta_info *sta;
464 unsigned long *aid_map;
467 aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
468 sizeof(*aid_map), GFP_KERNEL);
472 /* reserve aid 0 for mcast indication */
473 __set_bit(0, aid_map);
476 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
477 __set_bit(sta->sta.aid, aid_map);
480 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
483 if (aid > IEEE80211_MAX_AID)
489 static struct sta_info *
490 __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
492 struct sta_info *sta;
495 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
498 aid = mesh_allocate_aid(sdata);
502 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
506 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
510 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
511 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
512 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
517 static struct sta_info *
518 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
519 struct ieee802_11_elems *elems)
521 struct sta_info *sta = NULL;
523 /* Userspace handles station allocation */
524 if (sdata->u.mesh.user_mpm ||
525 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
526 if (mesh_peer_accepts_plinks(elems) &&
527 mesh_plink_availables(sdata))
528 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
533 sta = __mesh_sta_info_alloc(sdata, addr);
539 * mesh_sta_info_get - return mesh sta info entry for @addr.
541 * @sdata: local meshif
542 * @addr: peer's address
543 * @elems: IEs from beacon or mesh peering frame.
545 * Return existing or newly allocated sta_info under RCU read lock.
546 * (re)initialize with given IEs.
548 static struct sta_info *
549 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
550 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
552 struct sta_info *sta = NULL;
555 sta = sta_info_get(sdata, addr);
557 mesh_sta_info_init(sdata, sta, elems, false);
560 /* can't run atomic */
561 sta = mesh_sta_info_alloc(sdata, addr, elems);
567 mesh_sta_info_init(sdata, sta, elems, true);
569 if (sta_info_insert_rcu(sta))
577 * mesh_neighbour_update - update or initialize new mesh neighbor.
579 * @sdata: local meshif
580 * @addr: peer's address
581 * @elems: IEs from beacon or mesh peering frame
583 * Initiates peering if appropriate.
585 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
587 struct ieee802_11_elems *elems)
589 struct sta_info *sta;
592 sta = mesh_sta_info_get(sdata, hw_addr, elems);
596 if (mesh_peer_accepts_plinks(elems) &&
597 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
598 sdata->u.mesh.accepting_plinks &&
599 sdata->u.mesh.mshcfg.auto_open_plinks &&
600 rssi_threshold_check(sdata, sta))
601 changed = mesh_plink_open(sta);
603 ieee80211_mps_frame_release(sta, elems);
606 ieee80211_mbss_info_change_notify(sdata, changed);
609 static void mesh_plink_timer(unsigned long data)
611 struct sta_info *sta;
613 struct ieee80211_sub_if_data *sdata;
614 struct mesh_config *mshcfg;
615 enum ieee80211_self_protected_actioncode action = 0;
618 * This STA is valid because sta_info_destroy() will
619 * del_timer_sync() this timer after having made sure
620 * it cannot be readded (by deleting the plink.)
622 sta = (struct sta_info *) data;
624 if (sta->sdata->local->quiescing)
627 spin_lock_bh(&sta->mesh->plink_lock);
629 /* If a timer fires just before a state transition on another CPU,
630 * we may have already extended the timeout and changed state by the
631 * time we've acquired the lock and arrived here. In that case,
632 * skip this timer and wait for the new one.
634 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
636 "Ignoring timer for %pM in state %s (timer adjusted)",
637 sta->sta.addr, mplstates[sta->mesh->plink_state]);
638 spin_unlock_bh(&sta->mesh->plink_lock);
642 /* del_timer() and handler may race when entering these states */
643 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
644 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
646 "Ignoring timer for %pM in state %s (timer deleted)",
647 sta->sta.addr, mplstates[sta->mesh->plink_state]);
648 spin_unlock_bh(&sta->mesh->plink_lock);
653 "Mesh plink timer for %pM fired on state %s\n",
654 sta->sta.addr, mplstates[sta->mesh->plink_state]);
656 mshcfg = &sdata->u.mesh.mshcfg;
658 switch (sta->mesh->plink_state) {
659 case NL80211_PLINK_OPN_RCVD:
660 case NL80211_PLINK_OPN_SNT:
662 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
665 "Mesh plink for %pM (retry, timeout): %d %d\n",
666 sta->sta.addr, sta->mesh->plink_retries,
667 sta->mesh->plink_timeout);
668 get_random_bytes(&rand, sizeof(u32));
669 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
670 rand % sta->mesh->plink_timeout;
671 ++sta->mesh->plink_retries;
672 mod_plink_timer(sta, sta->mesh->plink_timeout);
673 action = WLAN_SP_MESH_PEERING_OPEN;
676 reason = WLAN_REASON_MESH_MAX_RETRIES;
677 /* fall through on else */
678 case NL80211_PLINK_CNF_RCVD:
681 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
682 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
683 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
684 action = WLAN_SP_MESH_PEERING_CLOSE;
686 case NL80211_PLINK_HOLDING:
688 del_timer(&sta->mesh->plink_timer);
689 mesh_plink_fsm_restart(sta);
694 spin_unlock_bh(&sta->mesh->plink_lock);
696 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
697 sta->mesh->llid, sta->mesh->plid, reason);
700 static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
702 sta->mesh->plink_timer.expires = jiffies + msecs_to_jiffies(timeout);
703 sta->mesh->plink_timer.data = (unsigned long) sta;
704 sta->mesh->plink_timer.function = mesh_plink_timer;
705 sta->mesh->plink_timeout = timeout;
706 add_timer(&sta->mesh->plink_timer);
709 static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
712 struct ieee80211_local *local = sdata->local;
714 struct sta_info *sta;
717 list_for_each_entry_rcu(sta, &local->sta_list, list) {
718 if (sdata != sta->sdata)
721 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
731 static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
736 get_random_bytes(&llid, sizeof(llid));
737 } while (llid_in_use(sdata, llid));
742 u32 mesh_plink_open(struct sta_info *sta)
744 struct ieee80211_sub_if_data *sdata = sta->sdata;
747 if (!test_sta_flag(sta, WLAN_STA_AUTH))
750 spin_lock_bh(&sta->mesh->plink_lock);
751 sta->mesh->llid = mesh_get_new_llid(sdata);
752 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
753 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
754 spin_unlock_bh(&sta->mesh->plink_lock);
757 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
758 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
759 spin_unlock_bh(&sta->mesh->plink_lock);
761 "Mesh plink: starting establishment with %pM\n",
764 /* set the non-peer mode to active during peering */
765 changed = ieee80211_mps_local_status_update(sdata);
767 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
768 sta->sta.addr, sta->mesh->llid, 0, 0);
772 u32 mesh_plink_block(struct sta_info *sta)
776 spin_lock_bh(&sta->mesh->plink_lock);
777 changed = __mesh_plink_deactivate(sta);
778 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
779 spin_unlock_bh(&sta->mesh->plink_lock);
780 mesh_path_flush_by_nexthop(sta);
785 static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
786 struct sta_info *sta,
787 enum plink_event event)
789 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
790 u16 reason = (event == CLS_ACPT) ?
791 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
793 sta->mesh->reason = reason;
794 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
795 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
798 static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
799 struct sta_info *sta)
801 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
804 del_timer(&sta->mesh->plink_timer);
805 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
806 changed |= mesh_plink_inc_estab_count(sdata);
807 changed |= mesh_set_ht_prot_mode(sdata);
808 changed |= mesh_set_short_slot_time(sdata);
809 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
810 ieee80211_mps_sta_status_update(sta);
811 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
816 * mesh_plink_fsm - step @sta MPM based on @event
819 * @sta: mesh neighbor
820 * @event: peering event
822 * Return: changed MBSS flags
824 static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
825 struct sta_info *sta, enum plink_event event)
827 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
828 enum ieee80211_self_protected_actioncode action = 0;
832 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
833 mplstates[sta->mesh->plink_state], mplevents[event]);
835 spin_lock_bh(&sta->mesh->plink_lock);
836 switch (sta->mesh->plink_state) {
837 case NL80211_PLINK_LISTEN:
840 mesh_plink_fsm_restart(sta);
843 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
844 sta->mesh->llid = mesh_get_new_llid(sdata);
845 mesh_plink_timer_set(sta,
846 mshcfg->dot11MeshRetryTimeout);
848 /* set the non-peer mode to active during peering */
849 changed |= ieee80211_mps_local_status_update(sdata);
850 action = WLAN_SP_MESH_PEERING_OPEN;
856 case NL80211_PLINK_OPN_SNT:
861 mesh_plink_close(sdata, sta, event);
862 action = WLAN_SP_MESH_PEERING_CLOSE;
865 /* retry timer is left untouched */
866 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
867 action = WLAN_SP_MESH_PEERING_CONFIRM;
870 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
871 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
877 case NL80211_PLINK_OPN_RCVD:
882 mesh_plink_close(sdata, sta, event);
883 action = WLAN_SP_MESH_PEERING_CLOSE;
886 action = WLAN_SP_MESH_PEERING_CONFIRM;
889 changed |= mesh_plink_establish(sdata, sta);
895 case NL80211_PLINK_CNF_RCVD:
900 mesh_plink_close(sdata, sta, event);
901 action = WLAN_SP_MESH_PEERING_CLOSE;
904 changed |= mesh_plink_establish(sdata, sta);
905 action = WLAN_SP_MESH_PEERING_CONFIRM;
911 case NL80211_PLINK_ESTAB:
914 changed |= __mesh_plink_deactivate(sta);
915 changed |= mesh_set_ht_prot_mode(sdata);
916 changed |= mesh_set_short_slot_time(sdata);
917 mesh_plink_close(sdata, sta, event);
918 action = WLAN_SP_MESH_PEERING_CLOSE;
922 action = WLAN_SP_MESH_PEERING_CONFIRM;
928 case NL80211_PLINK_HOLDING:
931 del_timer(&sta->mesh->plink_timer);
932 mesh_plink_fsm_restart(sta);
938 action = WLAN_SP_MESH_PEERING_CLOSE;
945 /* should not get here, PLINK_BLOCKED is dealt with at the
946 * beginning of the function
950 spin_unlock_bh(&sta->mesh->plink_lock);
952 mesh_path_flush_by_nexthop(sta);
954 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
955 sta->mesh->llid, sta->mesh->plid,
958 /* also send confirm in open case */
959 if (action == WLAN_SP_MESH_PEERING_OPEN) {
960 mesh_plink_frame_tx(sdata, sta,
961 WLAN_SP_MESH_PEERING_CONFIRM,
962 sta->sta.addr, sta->mesh->llid,
971 * mesh_plink_get_event - get correct MPM event
974 * @sta: peer, leave NULL if processing a frame from a new suitable peer
975 * @elems: peering management IEs
977 * @llid: peer's peer link ID
978 * @plid: peer's local link ID
980 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
983 static enum plink_event
984 mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
985 struct sta_info *sta,
986 struct ieee802_11_elems *elems,
987 enum ieee80211_self_protected_actioncode ftype,
990 enum plink_event event = PLINK_UNDEFINED;
991 u8 ie_len = elems->peering_len;
994 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
995 mesh_matches_local(sdata, elems));
997 /* deny open request from non-matching peer */
998 if (!matches_local && !sta) {
1004 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1005 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1008 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1009 if (!mesh_plink_free_count(sdata)) {
1010 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1014 /* new matching peer */
1018 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1019 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1022 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
1027 case WLAN_SP_MESH_PEERING_OPEN:
1030 if (!mesh_plink_free_count(sdata) ||
1031 (sta->mesh->plid && sta->mesh->plid != plid))
1036 case WLAN_SP_MESH_PEERING_CONFIRM:
1039 if (!mesh_plink_free_count(sdata) ||
1040 sta->mesh->llid != llid ||
1041 (sta->mesh->plid && sta->mesh->plid != plid))
1046 case WLAN_SP_MESH_PEERING_CLOSE:
1047 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
1048 /* Do not check for llid or plid. This does not
1049 * follow the standard but since multiple plinks
1050 * per sta are not supported, it is necessary in
1051 * order to avoid a livelock when MP A sees an
1052 * establish peer link to MP B but MP B does not
1053 * see it. This can be caused by a timeout in
1054 * B's peer link establishment or B beign
1058 else if (sta->mesh->plid != plid)
1060 else if (ie_len == 8 && sta->mesh->llid != llid)
1066 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1075 mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1076 struct ieee80211_mgmt *mgmt,
1077 struct ieee802_11_elems *elems)
1080 struct sta_info *sta;
1081 enum plink_event event;
1082 enum ieee80211_self_protected_actioncode ftype;
1084 u8 ie_len = elems->peering_len;
1087 if (!elems->peering) {
1089 "Mesh plink: missing necessary peer link ie\n");
1093 if (elems->rsn_len &&
1094 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1096 "Mesh plink: can't establish link with secure peer\n");
1100 ftype = mgmt->u.action.u.self_prot.action_code;
1101 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1102 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1103 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1106 "Mesh plink: incorrect plink ie length %d %d\n",
1111 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1112 (!elems->mesh_id || !elems->mesh_config)) {
1113 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1116 /* Note the lines below are correct, the llid in the frame is the plid
1117 * from the point of view of this host.
1119 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
1120 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1121 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1122 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
1124 /* WARNING: Only for sta pointer, is dropped & re-acquired */
1127 sta = sta_info_get(sdata, mgmt->sa);
1129 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1130 !rssi_threshold_check(sdata, sta)) {
1131 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1136 /* Now we will figure out the appropriate event... */
1137 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1139 if (event == OPN_ACPT) {
1141 /* allocate sta entry if necessary and update info */
1142 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
1144 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1147 sta->mesh->plid = plid;
1148 } else if (!sta && event == OPN_RJCT) {
1149 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
1151 WLAN_REASON_MESH_CONFIG);
1153 } else if (!sta || event == PLINK_UNDEFINED) {
1154 /* something went wrong */
1158 if (event == CNF_ACPT) {
1159 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1160 if (!sta->mesh->plid)
1161 sta->mesh->plid = plid;
1163 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1166 changed |= mesh_plink_fsm(sdata, sta, event);
1172 ieee80211_mbss_info_change_notify(sdata, changed);
1175 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1176 struct ieee80211_mgmt *mgmt, size_t len,
1177 struct ieee80211_rx_status *rx_status)
1179 struct ieee802_11_elems elems;
1183 /* need action_code, aux */
1184 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1187 if (sdata->u.mesh.user_mpm)
1188 /* userspace must register for these */
1191 if (is_multicast_ether_addr(mgmt->da)) {
1193 "Mesh plink: ignore frame from multicast address\n");
1197 baseaddr = mgmt->u.action.u.self_prot.variable;
1198 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1199 if (mgmt->u.action.u.self_prot.action_code ==
1200 WLAN_SP_MESH_PEERING_CONFIRM) {
1207 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1208 mesh_process_plink_frame(sdata, mgmt, &elems);