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 "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 ||
63 (sta && (s8) -ewma_signal_read(&sta->avg_signal) > rssi_threshold);
67 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
69 * @sta: mesh peer link to restart
71 * Locking: this function must be called holding sta->mesh->plink_lock
73 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
75 lockdep_assert_held(&sta->mesh->plink_lock);
76 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
77 sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0;
78 sta->mesh->plink_retries = 0;
82 * mesh_set_short_slot_time - enable / disable ERP short slot time.
84 * The standard indirectly mandates mesh STAs to turn off short slot time by
85 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
86 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
87 * MBSS support ERP rates.
89 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
91 static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
93 struct ieee80211_local *local = sdata->local;
94 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
95 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
97 u32 erp_rates = 0, changed = 0;
99 bool short_slot = false;
101 if (band == IEEE80211_BAND_5GHZ) {
102 /* (IEEE 802.11-2012 19.4.5) */
105 } else if (band != IEEE80211_BAND_2GHZ)
108 for (i = 0; i < sband->n_bitrates; i++)
109 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
116 list_for_each_entry_rcu(sta, &local->sta_list, list) {
117 if (sdata != sta->sdata ||
118 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
122 if (erp_rates & sta->sta.supp_rates[band])
130 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
131 sdata->vif.bss_conf.use_short_slot = short_slot;
132 changed = BSS_CHANGED_ERP_SLOT;
133 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
134 sdata->vif.addr, short_slot);
140 * mesh_set_ht_prot_mode - set correct HT protection mode
142 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
143 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
144 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
145 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
146 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
147 * HT20 peer is present. Otherwise no-protection mode is selected.
149 static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
151 struct ieee80211_local *local = sdata->local;
152 struct sta_info *sta;
154 bool non_ht_sta = false, ht20_sta = false;
156 switch (sdata->vif.bss_conf.chandef.width) {
157 case NL80211_CHAN_WIDTH_20_NOHT:
158 case NL80211_CHAN_WIDTH_5:
159 case NL80211_CHAN_WIDTH_10:
166 list_for_each_entry_rcu(sta, &local->sta_list, list) {
167 if (sdata != sta->sdata ||
168 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
171 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
174 if (!sta->sta.ht_cap.ht_supported) {
175 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
181 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
187 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
189 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
190 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
192 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
194 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
197 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
198 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
199 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
200 return BSS_CHANGED_HT;
203 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
204 struct sta_info *sta,
205 enum ieee80211_self_protected_actioncode action,
206 u8 *da, u16 llid, u16 plid, u16 reason)
208 struct ieee80211_local *local = sdata->local;
210 struct ieee80211_tx_info *info;
211 struct ieee80211_mgmt *mgmt;
212 bool include_plid = false;
213 u16 peering_proto = 0;
215 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
216 sizeof(mgmt->u.action.u.self_prot);
219 skb = dev_alloc_skb(local->tx_headroom +
221 2 + /* capability info */
223 2 + 8 + /* supported rates */
224 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
225 2 + sdata->u.mesh.mesh_id_len +
226 2 + sizeof(struct ieee80211_meshconf_ie) +
227 2 + sizeof(struct ieee80211_ht_cap) +
228 2 + sizeof(struct ieee80211_ht_operation) +
229 2 + sizeof(struct ieee80211_vht_cap) +
230 2 + sizeof(struct ieee80211_vht_operation) +
231 2 + 8 + /* peering IE */
232 sdata->u.mesh.ie_len);
235 info = IEEE80211_SKB_CB(skb);
236 skb_reserve(skb, local->tx_headroom);
237 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
238 memset(mgmt, 0, hdr_len);
239 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
240 IEEE80211_STYPE_ACTION);
241 memcpy(mgmt->da, da, ETH_ALEN);
242 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
243 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
244 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
245 mgmt->u.action.u.self_prot.action_code = action;
247 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
248 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
250 /* capability info */
251 pos = skb_put(skb, 2);
253 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
255 pos = skb_put(skb, 2);
256 put_unaligned_le16(sta->sta.aid, pos);
258 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
259 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
260 mesh_add_rsn_ie(sdata, skb) ||
261 mesh_add_meshid_ie(sdata, skb) ||
262 mesh_add_meshconf_ie(sdata, skb))
264 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
265 info->flags |= IEEE80211_TX_CTL_NO_ACK;
266 if (mesh_add_meshid_ie(sdata, skb))
270 /* Add Mesh Peering Management element */
272 case WLAN_SP_MESH_PEERING_OPEN:
274 case WLAN_SP_MESH_PEERING_CONFIRM:
278 case WLAN_SP_MESH_PEERING_CLOSE:
283 ie_len += 2; /* reason code */
290 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
293 pos = skb_put(skb, 2 + ie_len);
294 *pos++ = WLAN_EID_PEER_MGMT;
296 memcpy(pos, &peering_proto, 2);
298 put_unaligned_le16(llid, pos);
301 put_unaligned_le16(plid, pos);
304 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
305 put_unaligned_le16(reason, pos);
309 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
310 if (mesh_add_ht_cap_ie(sdata, skb) ||
311 mesh_add_ht_oper_ie(sdata, skb) ||
312 mesh_add_vht_cap_ie(sdata, skb) ||
313 mesh_add_vht_oper_ie(sdata, skb))
317 if (mesh_add_vendor_ies(sdata, skb))
320 ieee80211_tx_skb(sdata, skb);
328 * __mesh_plink_deactivate - deactivate mesh peer link
330 * @sta: mesh peer link to deactivate
332 * All mesh paths with this peer as next hop will be flushed
333 * Returns beacon changed flag if the beacon content changed.
335 * Locking: the caller must hold sta->mesh->plink_lock
337 static u32 __mesh_plink_deactivate(struct sta_info *sta)
339 struct ieee80211_sub_if_data *sdata = sta->sdata;
342 lockdep_assert_held(&sta->mesh->plink_lock);
344 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
345 changed = mesh_plink_dec_estab_count(sdata);
346 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
347 mesh_path_flush_by_nexthop(sta);
349 ieee80211_mps_sta_status_update(sta);
350 changed |= ieee80211_mps_set_sta_local_pm(sta,
351 NL80211_MESH_POWER_UNKNOWN);
357 * mesh_plink_deactivate - deactivate mesh peer link
359 * @sta: mesh peer link to deactivate
361 * All mesh paths with this peer as next hop will be flushed
363 u32 mesh_plink_deactivate(struct sta_info *sta)
365 struct ieee80211_sub_if_data *sdata = sta->sdata;
368 spin_lock_bh(&sta->mesh->plink_lock);
369 changed = __mesh_plink_deactivate(sta);
370 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
371 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
372 sta->sta.addr, sta->mesh->llid, sta->mesh->plid,
374 spin_unlock_bh(&sta->mesh->plink_lock);
379 static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
380 struct sta_info *sta,
381 struct ieee802_11_elems *elems, bool insert)
383 struct ieee80211_local *local = sdata->local;
384 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
385 struct ieee80211_supported_band *sband;
386 u32 rates, basic_rates = 0, changed = 0;
387 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
389 sband = local->hw.wiphy->bands[band];
390 rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates);
392 spin_lock_bh(&sta->mesh->plink_lock);
393 sta->last_rx = jiffies;
395 /* rates and capabilities don't change during peering */
396 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
397 sta->mesh->processed_beacon)
399 sta->mesh->processed_beacon = true;
401 if (sta->sta.supp_rates[band] != rates)
402 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
403 sta->sta.supp_rates[band] = rates;
405 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
406 elems->ht_cap_elem, sta))
407 changed |= IEEE80211_RC_BW_CHANGED;
409 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
410 elems->vht_cap_elem, sta);
412 if (bw != sta->sta.bandwidth)
413 changed |= IEEE80211_RC_BW_CHANGED;
415 /* HT peer is operating 20MHz-only */
416 if (elems->ht_operation &&
417 !(elems->ht_operation->ht_param &
418 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
419 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
420 changed |= IEEE80211_RC_BW_CHANGED;
421 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
425 rate_control_rate_init(sta);
427 rate_control_rate_update(local, sband, sta, changed);
429 spin_unlock_bh(&sta->mesh->plink_lock);
432 static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
434 struct sta_info *sta;
435 unsigned long *aid_map;
438 aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
439 sizeof(*aid_map), GFP_KERNEL);
443 /* reserve aid 0 for mcast indication */
444 __set_bit(0, aid_map);
447 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
448 __set_bit(sta->sta.aid, aid_map);
451 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
454 if (aid > IEEE80211_MAX_AID)
460 static struct sta_info *
461 __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
463 struct sta_info *sta;
466 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
469 aid = mesh_allocate_aid(sdata);
473 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
477 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
481 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
482 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
483 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
488 static struct sta_info *
489 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
490 struct ieee802_11_elems *elems)
492 struct sta_info *sta = NULL;
494 /* Userspace handles station allocation */
495 if (sdata->u.mesh.user_mpm ||
496 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
497 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
502 sta = __mesh_sta_info_alloc(sdata, addr);
508 * mesh_sta_info_get - return mesh sta info entry for @addr.
510 * @sdata: local meshif
511 * @addr: peer's address
512 * @elems: IEs from beacon or mesh peering frame.
514 * Return existing or newly allocated sta_info under RCU read lock.
515 * (re)initialize with given IEs.
517 static struct sta_info *
518 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
519 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
521 struct sta_info *sta = NULL;
524 sta = sta_info_get(sdata, addr);
526 mesh_sta_info_init(sdata, sta, elems, false);
529 /* can't run atomic */
530 sta = mesh_sta_info_alloc(sdata, addr, elems);
536 mesh_sta_info_init(sdata, sta, elems, true);
538 if (sta_info_insert_rcu(sta))
546 * mesh_neighbour_update - update or initialize new mesh neighbor.
548 * @sdata: local meshif
549 * @addr: peer's address
550 * @elems: IEs from beacon or mesh peering frame
552 * Initiates peering if appropriate.
554 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
556 struct ieee802_11_elems *elems)
558 struct sta_info *sta;
561 sta = mesh_sta_info_get(sdata, hw_addr, elems);
565 if (mesh_peer_accepts_plinks(elems) &&
566 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
567 sdata->u.mesh.accepting_plinks &&
568 sdata->u.mesh.mshcfg.auto_open_plinks &&
569 rssi_threshold_check(sdata, sta))
570 changed = mesh_plink_open(sta);
572 ieee80211_mps_frame_release(sta, elems);
575 ieee80211_mbss_info_change_notify(sdata, changed);
578 static void mesh_plink_timer(unsigned long data)
580 struct sta_info *sta;
582 struct ieee80211_sub_if_data *sdata;
583 struct mesh_config *mshcfg;
584 enum ieee80211_self_protected_actioncode action = 0;
587 * This STA is valid because sta_info_destroy() will
588 * del_timer_sync() this timer after having made sure
589 * it cannot be readded (by deleting the plink.)
591 sta = (struct sta_info *) data;
593 if (sta->sdata->local->quiescing)
596 spin_lock_bh(&sta->mesh->plink_lock);
598 /* If a timer fires just before a state transition on another CPU,
599 * we may have already extended the timeout and changed state by the
600 * time we've acquired the lock and arrived here. In that case,
601 * skip this timer and wait for the new one.
603 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
605 "Ignoring timer for %pM in state %s (timer adjusted)",
606 sta->sta.addr, mplstates[sta->mesh->plink_state]);
607 spin_unlock_bh(&sta->mesh->plink_lock);
611 /* del_timer() and handler may race when entering these states */
612 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
613 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
615 "Ignoring timer for %pM in state %s (timer deleted)",
616 sta->sta.addr, mplstates[sta->mesh->plink_state]);
617 spin_unlock_bh(&sta->mesh->plink_lock);
622 "Mesh plink timer for %pM fired on state %s\n",
623 sta->sta.addr, mplstates[sta->mesh->plink_state]);
625 mshcfg = &sdata->u.mesh.mshcfg;
627 switch (sta->mesh->plink_state) {
628 case NL80211_PLINK_OPN_RCVD:
629 case NL80211_PLINK_OPN_SNT:
631 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
634 "Mesh plink for %pM (retry, timeout): %d %d\n",
635 sta->sta.addr, sta->mesh->plink_retries,
636 sta->mesh->plink_timeout);
637 get_random_bytes(&rand, sizeof(u32));
638 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
639 rand % sta->mesh->plink_timeout;
640 ++sta->mesh->plink_retries;
641 mod_plink_timer(sta, sta->mesh->plink_timeout);
642 action = WLAN_SP_MESH_PEERING_OPEN;
645 reason = WLAN_REASON_MESH_MAX_RETRIES;
646 /* fall through on else */
647 case NL80211_PLINK_CNF_RCVD:
650 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
651 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
652 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
653 action = WLAN_SP_MESH_PEERING_CLOSE;
655 case NL80211_PLINK_HOLDING:
657 del_timer(&sta->mesh->plink_timer);
658 mesh_plink_fsm_restart(sta);
663 spin_unlock_bh(&sta->mesh->plink_lock);
665 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
666 sta->mesh->llid, sta->mesh->plid, reason);
669 static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
671 sta->mesh->plink_timer.expires = jiffies + msecs_to_jiffies(timeout);
672 sta->mesh->plink_timer.data = (unsigned long) sta;
673 sta->mesh->plink_timer.function = mesh_plink_timer;
674 sta->mesh->plink_timeout = timeout;
675 add_timer(&sta->mesh->plink_timer);
678 static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
681 struct ieee80211_local *local = sdata->local;
683 struct sta_info *sta;
686 list_for_each_entry_rcu(sta, &local->sta_list, list) {
687 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
697 static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
702 get_random_bytes(&llid, sizeof(llid));
703 } while (llid_in_use(sdata, llid));
708 u32 mesh_plink_open(struct sta_info *sta)
710 struct ieee80211_sub_if_data *sdata = sta->sdata;
713 if (!test_sta_flag(sta, WLAN_STA_AUTH))
716 spin_lock_bh(&sta->mesh->plink_lock);
717 sta->mesh->llid = mesh_get_new_llid(sdata);
718 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
719 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
720 spin_unlock_bh(&sta->mesh->plink_lock);
723 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
724 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
725 spin_unlock_bh(&sta->mesh->plink_lock);
727 "Mesh plink: starting establishment with %pM\n",
730 /* set the non-peer mode to active during peering */
731 changed = ieee80211_mps_local_status_update(sdata);
733 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
734 sta->sta.addr, sta->mesh->llid, 0, 0);
738 u32 mesh_plink_block(struct sta_info *sta)
742 spin_lock_bh(&sta->mesh->plink_lock);
743 changed = __mesh_plink_deactivate(sta);
744 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
745 spin_unlock_bh(&sta->mesh->plink_lock);
750 static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
751 struct sta_info *sta,
752 enum plink_event event)
754 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
755 u16 reason = (event == CLS_ACPT) ?
756 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
758 sta->mesh->reason = reason;
759 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
760 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
763 static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
764 struct sta_info *sta)
766 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
769 del_timer(&sta->mesh->plink_timer);
770 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
771 changed |= mesh_plink_inc_estab_count(sdata);
772 changed |= mesh_set_ht_prot_mode(sdata);
773 changed |= mesh_set_short_slot_time(sdata);
774 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
775 ieee80211_mps_sta_status_update(sta);
776 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
781 * mesh_plink_fsm - step @sta MPM based on @event
784 * @sta: mesh neighbor
785 * @event: peering event
787 * Return: changed MBSS flags
789 static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
790 struct sta_info *sta, enum plink_event event)
792 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
793 enum ieee80211_self_protected_actioncode action = 0;
796 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
797 mplstates[sta->mesh->plink_state], mplevents[event]);
799 spin_lock_bh(&sta->mesh->plink_lock);
800 switch (sta->mesh->plink_state) {
801 case NL80211_PLINK_LISTEN:
804 mesh_plink_fsm_restart(sta);
807 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
808 sta->mesh->llid = mesh_get_new_llid(sdata);
809 mesh_plink_timer_set(sta,
810 mshcfg->dot11MeshRetryTimeout);
812 /* set the non-peer mode to active during peering */
813 changed |= ieee80211_mps_local_status_update(sdata);
814 action = WLAN_SP_MESH_PEERING_OPEN;
820 case NL80211_PLINK_OPN_SNT:
825 mesh_plink_close(sdata, sta, event);
826 action = WLAN_SP_MESH_PEERING_CLOSE;
829 /* retry timer is left untouched */
830 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
831 action = WLAN_SP_MESH_PEERING_CONFIRM;
834 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
835 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
841 case NL80211_PLINK_OPN_RCVD:
846 mesh_plink_close(sdata, sta, event);
847 action = WLAN_SP_MESH_PEERING_CLOSE;
850 action = WLAN_SP_MESH_PEERING_CONFIRM;
853 changed |= mesh_plink_establish(sdata, sta);
859 case NL80211_PLINK_CNF_RCVD:
864 mesh_plink_close(sdata, sta, event);
865 action = WLAN_SP_MESH_PEERING_CLOSE;
868 changed |= mesh_plink_establish(sdata, sta);
869 action = WLAN_SP_MESH_PEERING_CONFIRM;
875 case NL80211_PLINK_ESTAB:
878 changed |= __mesh_plink_deactivate(sta);
879 changed |= mesh_set_ht_prot_mode(sdata);
880 changed |= mesh_set_short_slot_time(sdata);
881 mesh_plink_close(sdata, sta, event);
882 action = WLAN_SP_MESH_PEERING_CLOSE;
885 action = WLAN_SP_MESH_PEERING_CONFIRM;
891 case NL80211_PLINK_HOLDING:
894 del_timer(&sta->mesh->plink_timer);
895 mesh_plink_fsm_restart(sta);
901 action = WLAN_SP_MESH_PEERING_CLOSE;
908 /* should not get here, PLINK_BLOCKED is dealt with at the
909 * beginning of the function
913 spin_unlock_bh(&sta->mesh->plink_lock);
915 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
916 sta->mesh->llid, sta->mesh->plid,
919 /* also send confirm in open case */
920 if (action == WLAN_SP_MESH_PEERING_OPEN) {
921 mesh_plink_frame_tx(sdata, sta,
922 WLAN_SP_MESH_PEERING_CONFIRM,
923 sta->sta.addr, sta->mesh->llid,
932 * mesh_plink_get_event - get correct MPM event
935 * @sta: peer, leave NULL if processing a frame from a new suitable peer
936 * @elems: peering management IEs
938 * @llid: peer's peer link ID
939 * @plid: peer's local link ID
941 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
944 static enum plink_event
945 mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
946 struct sta_info *sta,
947 struct ieee802_11_elems *elems,
948 enum ieee80211_self_protected_actioncode ftype,
951 enum plink_event event = PLINK_UNDEFINED;
952 u8 ie_len = elems->peering_len;
955 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
956 mesh_matches_local(sdata, elems));
958 /* deny open request from non-matching peer */
959 if (!matches_local && !sta) {
965 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
966 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
969 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
970 if (!mesh_plink_free_count(sdata)) {
971 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
975 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
976 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
979 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
983 /* new matching peer */
990 case WLAN_SP_MESH_PEERING_OPEN:
993 if (!mesh_plink_free_count(sdata) ||
994 (sta->mesh->plid && sta->mesh->plid != plid))
999 case WLAN_SP_MESH_PEERING_CONFIRM:
1002 if (!mesh_plink_free_count(sdata) ||
1003 sta->mesh->llid != llid ||
1004 (sta->mesh->plid && sta->mesh->plid != plid))
1009 case WLAN_SP_MESH_PEERING_CLOSE:
1010 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
1011 /* Do not check for llid or plid. This does not
1012 * follow the standard but since multiple plinks
1013 * per sta are not supported, it is necessary in
1014 * order to avoid a livelock when MP A sees an
1015 * establish peer link to MP B but MP B does not
1016 * see it. This can be caused by a timeout in
1017 * B's peer link establishment or B beign
1021 else if (sta->mesh->plid != plid)
1023 else if (ie_len == 8 && sta->mesh->llid != llid)
1029 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1038 mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1039 struct ieee80211_mgmt *mgmt,
1040 struct ieee802_11_elems *elems)
1043 struct sta_info *sta;
1044 enum plink_event event;
1045 enum ieee80211_self_protected_actioncode ftype;
1047 u8 ie_len = elems->peering_len;
1050 if (!elems->peering) {
1052 "Mesh plink: missing necessary peer link ie\n");
1056 if (elems->rsn_len &&
1057 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1059 "Mesh plink: can't establish link with secure peer\n");
1063 ftype = mgmt->u.action.u.self_prot.action_code;
1064 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1065 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1066 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1069 "Mesh plink: incorrect plink ie length %d %d\n",
1074 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1075 (!elems->mesh_id || !elems->mesh_config)) {
1076 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1079 /* Note the lines below are correct, the llid in the frame is the plid
1080 * from the point of view of this host.
1082 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
1083 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1084 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1085 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
1087 /* WARNING: Only for sta pointer, is dropped & re-acquired */
1090 sta = sta_info_get(sdata, mgmt->sa);
1092 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1093 !rssi_threshold_check(sdata, sta)) {
1094 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1099 /* Now we will figure out the appropriate event... */
1100 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1102 if (event == OPN_ACPT) {
1104 /* allocate sta entry if necessary and update info */
1105 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
1107 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1110 sta->mesh->plid = plid;
1111 } else if (!sta && event == OPN_RJCT) {
1112 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
1114 WLAN_REASON_MESH_CONFIG);
1116 } else if (!sta || event == PLINK_UNDEFINED) {
1117 /* something went wrong */
1121 if (event == CNF_ACPT) {
1122 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1123 if (!sta->mesh->plid)
1124 sta->mesh->plid = plid;
1126 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1129 changed |= mesh_plink_fsm(sdata, sta, event);
1135 ieee80211_mbss_info_change_notify(sdata, changed);
1138 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1139 struct ieee80211_mgmt *mgmt, size_t len,
1140 struct ieee80211_rx_status *rx_status)
1142 struct ieee802_11_elems elems;
1146 /* need action_code, aux */
1147 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1150 if (sdata->u.mesh.user_mpm)
1151 /* userspace must register for these */
1154 if (is_multicast_ether_addr(mgmt->da)) {
1156 "Mesh plink: ignore frame from multicast address\n");
1160 baseaddr = mgmt->u.action.u.self_prot.variable;
1161 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1162 if (mgmt->u.action.u.self_prot.action_code ==
1163 WLAN_SP_MESH_PEERING_CONFIRM) {
1170 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1171 mesh_process_plink_frame(sdata, mgmt, &elems);