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 + 8 + /* peering IE */
230 sdata
->u
.mesh
.ie_len
);
233 info
= IEEE80211_SKB_CB(skb
);
234 skb_reserve(skb
, local
->tx_headroom
);
235 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, hdr_len
);
236 memset(mgmt
, 0, hdr_len
);
237 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
238 IEEE80211_STYPE_ACTION
);
239 memcpy(mgmt
->da
, da
, ETH_ALEN
);
240 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
241 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
242 mgmt
->u
.action
.category
= WLAN_CATEGORY_SELF_PROTECTED
;
243 mgmt
->u
.action
.u
.self_prot
.action_code
= action
;
245 if (action
!= WLAN_SP_MESH_PEERING_CLOSE
) {
246 enum ieee80211_band band
= ieee80211_get_sdata_band(sdata
);
248 /* capability info */
249 pos
= skb_put(skb
, 2);
251 if (action
== WLAN_SP_MESH_PEERING_CONFIRM
) {
253 pos
= skb_put(skb
, 2);
254 put_unaligned_le16(sta
->sta
.aid
, pos
);
256 if (ieee80211_add_srates_ie(sdata
, skb
, true, band
) ||
257 ieee80211_add_ext_srates_ie(sdata
, skb
, true, band
) ||
258 mesh_add_rsn_ie(sdata
, skb
) ||
259 mesh_add_meshid_ie(sdata
, skb
) ||
260 mesh_add_meshconf_ie(sdata
, skb
))
262 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
263 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
264 if (mesh_add_meshid_ie(sdata
, skb
))
268 /* Add Mesh Peering Management element */
270 case WLAN_SP_MESH_PEERING_OPEN
:
272 case WLAN_SP_MESH_PEERING_CONFIRM
:
276 case WLAN_SP_MESH_PEERING_CLOSE
:
281 ie_len
+= 2; /* reason code */
288 if (WARN_ON(skb_tailroom(skb
) < 2 + ie_len
))
291 pos
= skb_put(skb
, 2 + ie_len
);
292 *pos
++ = WLAN_EID_PEER_MGMT
;
294 memcpy(pos
, &peering_proto
, 2);
296 put_unaligned_le16(llid
, pos
);
299 put_unaligned_le16(plid
, pos
);
302 if (action
== WLAN_SP_MESH_PEERING_CLOSE
) {
303 put_unaligned_le16(reason
, pos
);
307 if (action
!= WLAN_SP_MESH_PEERING_CLOSE
) {
308 if (mesh_add_ht_cap_ie(sdata
, skb
) ||
309 mesh_add_ht_oper_ie(sdata
, skb
))
313 if (mesh_add_vendor_ies(sdata
, skb
))
316 ieee80211_tx_skb(sdata
, skb
);
324 * __mesh_plink_deactivate - deactivate mesh peer link
326 * @sta: mesh peer link to deactivate
328 * All mesh paths with this peer as next hop will be flushed
329 * Returns beacon changed flag if the beacon content changed.
331 * Locking: the caller must hold sta->mesh->plink_lock
333 static u32
__mesh_plink_deactivate(struct sta_info
*sta
)
335 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
338 lockdep_assert_held(&sta
->mesh
->plink_lock
);
340 if (sta
->mesh
->plink_state
== NL80211_PLINK_ESTAB
)
341 changed
= mesh_plink_dec_estab_count(sdata
);
342 sta
->mesh
->plink_state
= NL80211_PLINK_BLOCKED
;
343 mesh_path_flush_by_nexthop(sta
);
345 ieee80211_mps_sta_status_update(sta
);
346 changed
|= ieee80211_mps_set_sta_local_pm(sta
,
347 NL80211_MESH_POWER_UNKNOWN
);
353 * mesh_plink_deactivate - deactivate mesh peer link
355 * @sta: mesh peer link to deactivate
357 * All mesh paths with this peer as next hop will be flushed
359 u32
mesh_plink_deactivate(struct sta_info
*sta
)
361 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
364 spin_lock_bh(&sta
->mesh
->plink_lock
);
365 changed
= __mesh_plink_deactivate(sta
);
366 sta
->mesh
->reason
= WLAN_REASON_MESH_PEER_CANCELED
;
367 mesh_plink_frame_tx(sdata
, sta
, WLAN_SP_MESH_PEERING_CLOSE
,
368 sta
->sta
.addr
, sta
->mesh
->llid
, sta
->mesh
->plid
,
370 spin_unlock_bh(&sta
->mesh
->plink_lock
);
375 static void mesh_sta_info_init(struct ieee80211_sub_if_data
*sdata
,
376 struct sta_info
*sta
,
377 struct ieee802_11_elems
*elems
, bool insert
)
379 struct ieee80211_local
*local
= sdata
->local
;
380 enum ieee80211_band band
= ieee80211_get_sdata_band(sdata
);
381 struct ieee80211_supported_band
*sband
;
382 u32 rates
, basic_rates
= 0, changed
= 0;
383 enum ieee80211_sta_rx_bandwidth bw
= sta
->sta
.bandwidth
;
385 sband
= local
->hw
.wiphy
->bands
[band
];
386 rates
= ieee80211_sta_get_rates(sdata
, elems
, band
, &basic_rates
);
388 spin_lock_bh(&sta
->mesh
->plink_lock
);
389 sta
->last_rx
= jiffies
;
391 /* rates and capabilities don't change during peering */
392 if (sta
->mesh
->plink_state
== NL80211_PLINK_ESTAB
&&
393 sta
->mesh
->processed_beacon
)
395 sta
->mesh
->processed_beacon
= true;
397 if (sta
->sta
.supp_rates
[band
] != rates
)
398 changed
|= IEEE80211_RC_SUPP_RATES_CHANGED
;
399 sta
->sta
.supp_rates
[band
] = rates
;
401 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata
, sband
,
402 elems
->ht_cap_elem
, sta
))
403 changed
|= IEEE80211_RC_BW_CHANGED
;
405 if (bw
!= sta
->sta
.bandwidth
)
406 changed
|= IEEE80211_RC_BW_CHANGED
;
408 /* HT peer is operating 20MHz-only */
409 if (elems
->ht_operation
&&
410 !(elems
->ht_operation
->ht_param
&
411 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY
)) {
412 if (sta
->sta
.bandwidth
!= IEEE80211_STA_RX_BW_20
)
413 changed
|= IEEE80211_RC_BW_CHANGED
;
414 sta
->sta
.bandwidth
= IEEE80211_STA_RX_BW_20
;
418 rate_control_rate_init(sta
);
420 rate_control_rate_update(local
, sband
, sta
, changed
);
422 spin_unlock_bh(&sta
->mesh
->plink_lock
);
425 static int mesh_allocate_aid(struct ieee80211_sub_if_data
*sdata
)
427 struct sta_info
*sta
;
428 unsigned long *aid_map
;
431 aid_map
= kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID
+ 1),
432 sizeof(*aid_map
), GFP_KERNEL
);
436 /* reserve aid 0 for mcast indication */
437 __set_bit(0, aid_map
);
440 list_for_each_entry_rcu(sta
, &sdata
->local
->sta_list
, list
)
441 __set_bit(sta
->sta
.aid
, aid_map
);
444 aid
= find_first_zero_bit(aid_map
, IEEE80211_MAX_AID
+ 1);
447 if (aid
> IEEE80211_MAX_AID
)
453 static struct sta_info
*
454 __mesh_sta_info_alloc(struct ieee80211_sub_if_data
*sdata
, u8
*hw_addr
)
456 struct sta_info
*sta
;
459 if (sdata
->local
->num_sta
>= MESH_MAX_PLINKS
)
462 aid
= mesh_allocate_aid(sdata
);
466 sta
= sta_info_alloc(sdata
, hw_addr
, GFP_KERNEL
);
470 sta
->mesh
->plink_state
= NL80211_PLINK_LISTEN
;
474 sta_info_pre_move_state(sta
, IEEE80211_STA_AUTH
);
475 sta_info_pre_move_state(sta
, IEEE80211_STA_ASSOC
);
476 sta_info_pre_move_state(sta
, IEEE80211_STA_AUTHORIZED
);
481 static struct sta_info
*
482 mesh_sta_info_alloc(struct ieee80211_sub_if_data
*sdata
, u8
*addr
,
483 struct ieee802_11_elems
*elems
)
485 struct sta_info
*sta
= NULL
;
487 /* Userspace handles station allocation */
488 if (sdata
->u
.mesh
.user_mpm
||
489 sdata
->u
.mesh
.security
& IEEE80211_MESH_SEC_AUTHED
)
490 cfg80211_notify_new_peer_candidate(sdata
->dev
, addr
,
495 sta
= __mesh_sta_info_alloc(sdata
, addr
);
501 * mesh_sta_info_get - return mesh sta info entry for @addr.
503 * @sdata: local meshif
504 * @addr: peer's address
505 * @elems: IEs from beacon or mesh peering frame.
507 * Return existing or newly allocated sta_info under RCU read lock.
508 * (re)initialize with given IEs.
510 static struct sta_info
*
511 mesh_sta_info_get(struct ieee80211_sub_if_data
*sdata
,
512 u8
*addr
, struct ieee802_11_elems
*elems
) __acquires(RCU
)
514 struct sta_info
*sta
= NULL
;
517 sta
= sta_info_get(sdata
, addr
);
519 mesh_sta_info_init(sdata
, sta
, elems
, false);
522 /* can't run atomic */
523 sta
= mesh_sta_info_alloc(sdata
, addr
, elems
);
529 mesh_sta_info_init(sdata
, sta
, elems
, true);
531 if (sta_info_insert_rcu(sta
))
539 * mesh_neighbour_update - update or initialize new mesh neighbor.
541 * @sdata: local meshif
542 * @addr: peer's address
543 * @elems: IEs from beacon or mesh peering frame
545 * Initiates peering if appropriate.
547 void mesh_neighbour_update(struct ieee80211_sub_if_data
*sdata
,
549 struct ieee802_11_elems
*elems
)
551 struct sta_info
*sta
;
554 sta
= mesh_sta_info_get(sdata
, hw_addr
, elems
);
558 if (mesh_peer_accepts_plinks(elems
) &&
559 sta
->mesh
->plink_state
== NL80211_PLINK_LISTEN
&&
560 sdata
->u
.mesh
.accepting_plinks
&&
561 sdata
->u
.mesh
.mshcfg
.auto_open_plinks
&&
562 rssi_threshold_check(sdata
, sta
))
563 changed
= mesh_plink_open(sta
);
565 ieee80211_mps_frame_release(sta
, elems
);
568 ieee80211_mbss_info_change_notify(sdata
, changed
);
571 static void mesh_plink_timer(unsigned long data
)
573 struct sta_info
*sta
;
575 struct ieee80211_sub_if_data
*sdata
;
576 struct mesh_config
*mshcfg
;
577 enum ieee80211_self_protected_actioncode action
= 0;
580 * This STA is valid because sta_info_destroy() will
581 * del_timer_sync() this timer after having made sure
582 * it cannot be readded (by deleting the plink.)
584 sta
= (struct sta_info
*) data
;
586 if (sta
->sdata
->local
->quiescing
)
589 spin_lock_bh(&sta
->mesh
->plink_lock
);
591 /* If a timer fires just before a state transition on another CPU,
592 * we may have already extended the timeout and changed state by the
593 * time we've acquired the lock and arrived here. In that case,
594 * skip this timer and wait for the new one.
596 if (time_before(jiffies
, sta
->mesh
->plink_timer
.expires
)) {
598 "Ignoring timer for %pM in state %s (timer adjusted)",
599 sta
->sta
.addr
, mplstates
[sta
->mesh
->plink_state
]);
600 spin_unlock_bh(&sta
->mesh
->plink_lock
);
604 /* del_timer() and handler may race when entering these states */
605 if (sta
->mesh
->plink_state
== NL80211_PLINK_LISTEN
||
606 sta
->mesh
->plink_state
== NL80211_PLINK_ESTAB
) {
608 "Ignoring timer for %pM in state %s (timer deleted)",
609 sta
->sta
.addr
, mplstates
[sta
->mesh
->plink_state
]);
610 spin_unlock_bh(&sta
->mesh
->plink_lock
);
615 "Mesh plink timer for %pM fired on state %s\n",
616 sta
->sta
.addr
, mplstates
[sta
->mesh
->plink_state
]);
618 mshcfg
= &sdata
->u
.mesh
.mshcfg
;
620 switch (sta
->mesh
->plink_state
) {
621 case NL80211_PLINK_OPN_RCVD
:
622 case NL80211_PLINK_OPN_SNT
:
624 if (sta
->mesh
->plink_retries
< mshcfg
->dot11MeshMaxRetries
) {
627 "Mesh plink for %pM (retry, timeout): %d %d\n",
628 sta
->sta
.addr
, sta
->mesh
->plink_retries
,
629 sta
->mesh
->plink_timeout
);
630 get_random_bytes(&rand
, sizeof(u32
));
631 sta
->mesh
->plink_timeout
= sta
->mesh
->plink_timeout
+
632 rand
% sta
->mesh
->plink_timeout
;
633 ++sta
->mesh
->plink_retries
;
634 mod_plink_timer(sta
, sta
->mesh
->plink_timeout
);
635 action
= WLAN_SP_MESH_PEERING_OPEN
;
638 reason
= WLAN_REASON_MESH_MAX_RETRIES
;
639 /* fall through on else */
640 case NL80211_PLINK_CNF_RCVD
:
643 reason
= WLAN_REASON_MESH_CONFIRM_TIMEOUT
;
644 sta
->mesh
->plink_state
= NL80211_PLINK_HOLDING
;
645 mod_plink_timer(sta
, mshcfg
->dot11MeshHoldingTimeout
);
646 action
= WLAN_SP_MESH_PEERING_CLOSE
;
648 case NL80211_PLINK_HOLDING
:
650 del_timer(&sta
->mesh
->plink_timer
);
651 mesh_plink_fsm_restart(sta
);
656 spin_unlock_bh(&sta
->mesh
->plink_lock
);
658 mesh_plink_frame_tx(sdata
, sta
, action
, sta
->sta
.addr
,
659 sta
->mesh
->llid
, sta
->mesh
->plid
, reason
);
662 static inline void mesh_plink_timer_set(struct sta_info
*sta
, u32 timeout
)
664 sta
->mesh
->plink_timer
.expires
= jiffies
+ msecs_to_jiffies(timeout
);
665 sta
->mesh
->plink_timer
.data
= (unsigned long) sta
;
666 sta
->mesh
->plink_timer
.function
= mesh_plink_timer
;
667 sta
->mesh
->plink_timeout
= timeout
;
668 add_timer(&sta
->mesh
->plink_timer
);
671 static bool llid_in_use(struct ieee80211_sub_if_data
*sdata
,
674 struct ieee80211_local
*local
= sdata
->local
;
676 struct sta_info
*sta
;
679 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
680 if (!memcmp(&sta
->mesh
->llid
, &llid
, sizeof(llid
))) {
690 static u16
mesh_get_new_llid(struct ieee80211_sub_if_data
*sdata
)
695 get_random_bytes(&llid
, sizeof(llid
));
696 } while (llid_in_use(sdata
, llid
));
701 u32
mesh_plink_open(struct sta_info
*sta
)
703 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
706 if (!test_sta_flag(sta
, WLAN_STA_AUTH
))
709 spin_lock_bh(&sta
->mesh
->plink_lock
);
710 sta
->mesh
->llid
= mesh_get_new_llid(sdata
);
711 if (sta
->mesh
->plink_state
!= NL80211_PLINK_LISTEN
&&
712 sta
->mesh
->plink_state
!= NL80211_PLINK_BLOCKED
) {
713 spin_unlock_bh(&sta
->mesh
->plink_lock
);
716 sta
->mesh
->plink_state
= NL80211_PLINK_OPN_SNT
;
717 mesh_plink_timer_set(sta
, sdata
->u
.mesh
.mshcfg
.dot11MeshRetryTimeout
);
718 spin_unlock_bh(&sta
->mesh
->plink_lock
);
720 "Mesh plink: starting establishment with %pM\n",
723 /* set the non-peer mode to active during peering */
724 changed
= ieee80211_mps_local_status_update(sdata
);
726 mesh_plink_frame_tx(sdata
, sta
, WLAN_SP_MESH_PEERING_OPEN
,
727 sta
->sta
.addr
, sta
->mesh
->llid
, 0, 0);
731 u32
mesh_plink_block(struct sta_info
*sta
)
735 spin_lock_bh(&sta
->mesh
->plink_lock
);
736 changed
= __mesh_plink_deactivate(sta
);
737 sta
->mesh
->plink_state
= NL80211_PLINK_BLOCKED
;
738 spin_unlock_bh(&sta
->mesh
->plink_lock
);
743 static void mesh_plink_close(struct ieee80211_sub_if_data
*sdata
,
744 struct sta_info
*sta
,
745 enum plink_event event
)
747 struct mesh_config
*mshcfg
= &sdata
->u
.mesh
.mshcfg
;
748 u16 reason
= (event
== CLS_ACPT
) ?
749 WLAN_REASON_MESH_CLOSE
: WLAN_REASON_MESH_CONFIG
;
751 sta
->mesh
->reason
= reason
;
752 sta
->mesh
->plink_state
= NL80211_PLINK_HOLDING
;
753 mod_plink_timer(sta
, mshcfg
->dot11MeshHoldingTimeout
);
756 static u32
mesh_plink_establish(struct ieee80211_sub_if_data
*sdata
,
757 struct sta_info
*sta
)
759 struct mesh_config
*mshcfg
= &sdata
->u
.mesh
.mshcfg
;
762 del_timer(&sta
->mesh
->plink_timer
);
763 sta
->mesh
->plink_state
= NL80211_PLINK_ESTAB
;
764 changed
|= mesh_plink_inc_estab_count(sdata
);
765 changed
|= mesh_set_ht_prot_mode(sdata
);
766 changed
|= mesh_set_short_slot_time(sdata
);
767 mpl_dbg(sdata
, "Mesh plink with %pM ESTABLISHED\n", sta
->sta
.addr
);
768 ieee80211_mps_sta_status_update(sta
);
769 changed
|= ieee80211_mps_set_sta_local_pm(sta
, mshcfg
->power_mode
);
774 * mesh_plink_fsm - step @sta MPM based on @event
777 * @sta: mesh neighbor
778 * @event: peering event
780 * Return: changed MBSS flags
782 static u32
mesh_plink_fsm(struct ieee80211_sub_if_data
*sdata
,
783 struct sta_info
*sta
, enum plink_event event
)
785 struct mesh_config
*mshcfg
= &sdata
->u
.mesh
.mshcfg
;
786 enum ieee80211_self_protected_actioncode action
= 0;
789 mpl_dbg(sdata
, "peer %pM in state %s got event %s\n", sta
->sta
.addr
,
790 mplstates
[sta
->mesh
->plink_state
], mplevents
[event
]);
792 spin_lock_bh(&sta
->mesh
->plink_lock
);
793 switch (sta
->mesh
->plink_state
) {
794 case NL80211_PLINK_LISTEN
:
797 mesh_plink_fsm_restart(sta
);
800 sta
->mesh
->plink_state
= NL80211_PLINK_OPN_RCVD
;
801 sta
->mesh
->llid
= mesh_get_new_llid(sdata
);
802 mesh_plink_timer_set(sta
,
803 mshcfg
->dot11MeshRetryTimeout
);
805 /* set the non-peer mode to active during peering */
806 changed
|= ieee80211_mps_local_status_update(sdata
);
807 action
= WLAN_SP_MESH_PEERING_OPEN
;
813 case NL80211_PLINK_OPN_SNT
:
818 mesh_plink_close(sdata
, sta
, event
);
819 action
= WLAN_SP_MESH_PEERING_CLOSE
;
822 /* retry timer is left untouched */
823 sta
->mesh
->plink_state
= NL80211_PLINK_OPN_RCVD
;
824 action
= WLAN_SP_MESH_PEERING_CONFIRM
;
827 sta
->mesh
->plink_state
= NL80211_PLINK_CNF_RCVD
;
828 mod_plink_timer(sta
, mshcfg
->dot11MeshConfirmTimeout
);
834 case NL80211_PLINK_OPN_RCVD
:
839 mesh_plink_close(sdata
, sta
, event
);
840 action
= WLAN_SP_MESH_PEERING_CLOSE
;
843 action
= WLAN_SP_MESH_PEERING_CONFIRM
;
846 changed
|= mesh_plink_establish(sdata
, sta
);
852 case NL80211_PLINK_CNF_RCVD
:
857 mesh_plink_close(sdata
, sta
, event
);
858 action
= WLAN_SP_MESH_PEERING_CLOSE
;
861 changed
|= mesh_plink_establish(sdata
, sta
);
862 action
= WLAN_SP_MESH_PEERING_CONFIRM
;
868 case NL80211_PLINK_ESTAB
:
871 changed
|= __mesh_plink_deactivate(sta
);
872 changed
|= mesh_set_ht_prot_mode(sdata
);
873 changed
|= mesh_set_short_slot_time(sdata
);
874 mesh_plink_close(sdata
, sta
, event
);
875 action
= WLAN_SP_MESH_PEERING_CLOSE
;
878 action
= WLAN_SP_MESH_PEERING_CONFIRM
;
884 case NL80211_PLINK_HOLDING
:
887 del_timer(&sta
->mesh
->plink_timer
);
888 mesh_plink_fsm_restart(sta
);
894 action
= WLAN_SP_MESH_PEERING_CLOSE
;
901 /* should not get here, PLINK_BLOCKED is dealt with at the
902 * beginning of the function
906 spin_unlock_bh(&sta
->mesh
->plink_lock
);
908 mesh_plink_frame_tx(sdata
, sta
, action
, sta
->sta
.addr
,
909 sta
->mesh
->llid
, sta
->mesh
->plid
,
912 /* also send confirm in open case */
913 if (action
== WLAN_SP_MESH_PEERING_OPEN
) {
914 mesh_plink_frame_tx(sdata
, sta
,
915 WLAN_SP_MESH_PEERING_CONFIRM
,
916 sta
->sta
.addr
, sta
->mesh
->llid
,
925 * mesh_plink_get_event - get correct MPM event
928 * @sta: peer, leave NULL if processing a frame from a new suitable peer
929 * @elems: peering management IEs
931 * @llid: peer's peer link ID
932 * @plid: peer's local link ID
934 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
937 static enum plink_event
938 mesh_plink_get_event(struct ieee80211_sub_if_data
*sdata
,
939 struct sta_info
*sta
,
940 struct ieee802_11_elems
*elems
,
941 enum ieee80211_self_protected_actioncode ftype
,
944 enum plink_event event
= PLINK_UNDEFINED
;
945 u8 ie_len
= elems
->peering_len
;
948 matches_local
= (ftype
== WLAN_SP_MESH_PEERING_CLOSE
||
949 mesh_matches_local(sdata
, elems
));
951 /* deny open request from non-matching peer */
952 if (!matches_local
&& !sta
) {
958 if (ftype
!= WLAN_SP_MESH_PEERING_OPEN
) {
959 mpl_dbg(sdata
, "Mesh plink: cls or cnf from unknown peer\n");
962 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
963 if (!mesh_plink_free_count(sdata
)) {
964 mpl_dbg(sdata
, "Mesh plink error: no more free plinks\n");
968 if (!test_sta_flag(sta
, WLAN_STA_AUTH
)) {
969 mpl_dbg(sdata
, "Mesh plink: Action frame from non-authed peer\n");
972 if (sta
->mesh
->plink_state
== NL80211_PLINK_BLOCKED
)
976 /* new matching peer */
983 case WLAN_SP_MESH_PEERING_OPEN
:
986 if (!mesh_plink_free_count(sdata
) ||
987 (sta
->mesh
->plid
&& sta
->mesh
->plid
!= plid
))
992 case WLAN_SP_MESH_PEERING_CONFIRM
:
995 if (!mesh_plink_free_count(sdata
) ||
996 sta
->mesh
->llid
!= llid
||
997 (sta
->mesh
->plid
&& sta
->mesh
->plid
!= plid
))
1002 case WLAN_SP_MESH_PEERING_CLOSE
:
1003 if (sta
->mesh
->plink_state
== NL80211_PLINK_ESTAB
)
1004 /* Do not check for llid or plid. This does not
1005 * follow the standard but since multiple plinks
1006 * per sta are not supported, it is necessary in
1007 * order to avoid a livelock when MP A sees an
1008 * establish peer link to MP B but MP B does not
1009 * see it. This can be caused by a timeout in
1010 * B's peer link establishment or B beign
1014 else if (sta
->mesh
->plid
!= plid
)
1016 else if (ie_len
== 8 && sta
->mesh
->llid
!= llid
)
1022 mpl_dbg(sdata
, "Mesh plink: unknown frame subtype\n");
1031 mesh_process_plink_frame(struct ieee80211_sub_if_data
*sdata
,
1032 struct ieee80211_mgmt
*mgmt
,
1033 struct ieee802_11_elems
*elems
)
1036 struct sta_info
*sta
;
1037 enum plink_event event
;
1038 enum ieee80211_self_protected_actioncode ftype
;
1040 u8 ie_len
= elems
->peering_len
;
1043 if (!elems
->peering
) {
1045 "Mesh plink: missing necessary peer link ie\n");
1049 if (elems
->rsn_len
&&
1050 sdata
->u
.mesh
.security
== IEEE80211_MESH_SEC_NONE
) {
1052 "Mesh plink: can't establish link with secure peer\n");
1056 ftype
= mgmt
->u
.action
.u
.self_prot
.action_code
;
1057 if ((ftype
== WLAN_SP_MESH_PEERING_OPEN
&& ie_len
!= 4) ||
1058 (ftype
== WLAN_SP_MESH_PEERING_CONFIRM
&& ie_len
!= 6) ||
1059 (ftype
== WLAN_SP_MESH_PEERING_CLOSE
&& ie_len
!= 6
1062 "Mesh plink: incorrect plink ie length %d %d\n",
1067 if (ftype
!= WLAN_SP_MESH_PEERING_CLOSE
&&
1068 (!elems
->mesh_id
|| !elems
->mesh_config
)) {
1069 mpl_dbg(sdata
, "Mesh plink: missing necessary ie\n");
1072 /* Note the lines below are correct, the llid in the frame is the plid
1073 * from the point of view of this host.
1075 plid
= get_unaligned_le16(PLINK_GET_LLID(elems
->peering
));
1076 if (ftype
== WLAN_SP_MESH_PEERING_CONFIRM
||
1077 (ftype
== WLAN_SP_MESH_PEERING_CLOSE
&& ie_len
== 8))
1078 llid
= get_unaligned_le16(PLINK_GET_PLID(elems
->peering
));
1080 /* WARNING: Only for sta pointer, is dropped & re-acquired */
1083 sta
= sta_info_get(sdata
, mgmt
->sa
);
1085 if (ftype
== WLAN_SP_MESH_PEERING_OPEN
&&
1086 !rssi_threshold_check(sdata
, sta
)) {
1087 mpl_dbg(sdata
, "Mesh plink: %pM does not meet rssi threshold\n",
1092 /* Now we will figure out the appropriate event... */
1093 event
= mesh_plink_get_event(sdata
, sta
, elems
, ftype
, llid
, plid
);
1095 if (event
== OPN_ACPT
) {
1097 /* allocate sta entry if necessary and update info */
1098 sta
= mesh_sta_info_get(sdata
, mgmt
->sa
, elems
);
1100 mpl_dbg(sdata
, "Mesh plink: failed to init peer!\n");
1103 sta
->mesh
->plid
= plid
;
1104 } else if (!sta
&& event
== OPN_RJCT
) {
1105 mesh_plink_frame_tx(sdata
, NULL
, WLAN_SP_MESH_PEERING_CLOSE
,
1107 WLAN_REASON_MESH_CONFIG
);
1109 } else if (!sta
|| event
== PLINK_UNDEFINED
) {
1110 /* something went wrong */
1114 if (event
== CNF_ACPT
) {
1115 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1116 if (!sta
->mesh
->plid
)
1117 sta
->mesh
->plid
= plid
;
1119 sta
->mesh
->aid
= get_unaligned_le16(PLINK_CNF_AID(mgmt
));
1122 changed
|= mesh_plink_fsm(sdata
, sta
, event
);
1128 ieee80211_mbss_info_change_notify(sdata
, changed
);
1131 void mesh_rx_plink_frame(struct ieee80211_sub_if_data
*sdata
,
1132 struct ieee80211_mgmt
*mgmt
, size_t len
,
1133 struct ieee80211_rx_status
*rx_status
)
1135 struct ieee802_11_elems elems
;
1139 /* need action_code, aux */
1140 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 3)
1143 if (sdata
->u
.mesh
.user_mpm
)
1144 /* userspace must register for these */
1147 if (is_multicast_ether_addr(mgmt
->da
)) {
1149 "Mesh plink: ignore frame from multicast address\n");
1153 baseaddr
= mgmt
->u
.action
.u
.self_prot
.variable
;
1154 baselen
= (u8
*) mgmt
->u
.action
.u
.self_prot
.variable
- (u8
*) mgmt
;
1155 if (mgmt
->u
.action
.u
.self_prot
.action_code
==
1156 WLAN_SP_MESH_PEERING_CONFIRM
) {
1163 ieee802_11_parse_elems(baseaddr
, len
- baselen
, true, &elems
);
1164 mesh_process_plink_frame(sdata
, mgmt
, &elems
);