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_GET_LLID(p) (p + 2)
17 #define PLINK_GET_PLID(p) (p + 4)
19 #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \
20 jiffies + HZ * t / 1000))
22 /* We only need a valid sta if user configured a minimum rssi_threshold. */
23 #define rssi_threshold_check(sta, sdata) \
24 (sdata->u.mesh.mshcfg.rssi_threshold == 0 ||\
25 (sta && (s8) -ewma_read(&sta->avg_signal) > \
26 sdata->u.mesh.mshcfg.rssi_threshold))
40 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data
*sdata
,
41 enum ieee80211_self_protected_actioncode action
,
42 u8
*da
, __le16 llid
, __le16 plid
, __le16 reason
);
45 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
47 * @sta: mesh peer link to restart
49 * Locking: this function must be called holding sta->lock
51 static inline void mesh_plink_fsm_restart(struct sta_info
*sta
)
53 sta
->plink_state
= NL80211_PLINK_LISTEN
;
54 sta
->llid
= sta
->plid
= sta
->reason
= 0;
55 sta
->plink_retries
= 0;
59 * mesh_set_short_slot_time - enable / disable ERP short slot time.
61 * The standard indirectly mandates mesh STAs to turn off short slot time by
62 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
63 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
64 * MBSS support ERP rates.
66 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
68 static u32
mesh_set_short_slot_time(struct ieee80211_sub_if_data
*sdata
)
70 struct ieee80211_local
*local
= sdata
->local
;
71 enum ieee80211_band band
= ieee80211_get_sdata_band(sdata
);
72 struct ieee80211_supported_band
*sband
= local
->hw
.wiphy
->bands
[band
];
74 u32 erp_rates
= 0, changed
= 0;
76 bool short_slot
= false;
78 if (band
== IEEE80211_BAND_5GHZ
) {
79 /* (IEEE 802.11-2012 19.4.5) */
82 } else if (band
!= IEEE80211_BAND_2GHZ
||
83 (band
== IEEE80211_BAND_2GHZ
&&
84 local
->hw
.flags
& IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE
))
87 for (i
= 0; i
< sband
->n_bitrates
; i
++)
88 if (sband
->bitrates
[i
].flags
& IEEE80211_RATE_ERP_G
)
95 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
96 if (sdata
!= sta
->sdata
||
97 sta
->plink_state
!= NL80211_PLINK_ESTAB
)
101 if (erp_rates
& sta
->sta
.supp_rates
[band
])
109 if (sdata
->vif
.bss_conf
.use_short_slot
!= short_slot
) {
110 sdata
->vif
.bss_conf
.use_short_slot
= short_slot
;
111 changed
= BSS_CHANGED_ERP_SLOT
;
112 mpl_dbg(sdata
, "mesh_plink %pM: ERP short slot time %d\n",
113 sdata
->vif
.addr
, short_slot
);
119 * mesh_set_ht_prot_mode - set correct HT protection mode
121 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
122 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
123 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
124 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
125 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
126 * HT20 peer is present. Otherwise no-protection mode is selected.
128 static u32
mesh_set_ht_prot_mode(struct ieee80211_sub_if_data
*sdata
)
130 struct ieee80211_local
*local
= sdata
->local
;
131 struct sta_info
*sta
;
134 bool non_ht_sta
= false, ht20_sta
= false;
136 if (sdata
->vif
.bss_conf
.chandef
.width
== NL80211_CHAN_WIDTH_20_NOHT
)
140 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
141 if (sdata
!= sta
->sdata
||
142 sta
->plink_state
!= NL80211_PLINK_ESTAB
)
145 switch (sta
->ch_width
) {
146 case NL80211_CHAN_WIDTH_20_NOHT
:
148 "mesh_plink %pM: nonHT sta (%pM) is present\n",
149 sdata
->vif
.addr
, sta
->sta
.addr
);
152 case NL80211_CHAN_WIDTH_20
:
154 "mesh_plink %pM: HT20 sta (%pM) is present\n",
155 sdata
->vif
.addr
, sta
->sta
.addr
);
165 ht_opmode
= IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
;
167 sdata
->vif
.bss_conf
.chandef
.width
> NL80211_CHAN_WIDTH_20
)
168 ht_opmode
= IEEE80211_HT_OP_MODE_PROTECTION_20MHZ
;
170 ht_opmode
= IEEE80211_HT_OP_MODE_PROTECTION_NONE
;
172 if (sdata
->vif
.bss_conf
.ht_operation_mode
!= ht_opmode
) {
173 sdata
->vif
.bss_conf
.ht_operation_mode
= ht_opmode
;
174 sdata
->u
.mesh
.mshcfg
.ht_opmode
= ht_opmode
;
175 changed
= BSS_CHANGED_HT
;
177 "mesh_plink %pM: protection mode changed to %d\n",
178 sdata
->vif
.addr
, ht_opmode
);
185 * __mesh_plink_deactivate - deactivate mesh peer link
187 * @sta: mesh peer link to deactivate
189 * All mesh paths with this peer as next hop will be flushed
190 * Returns beacon changed flag if the beacon content changed.
192 * Locking: the caller must hold sta->lock
194 static u32
__mesh_plink_deactivate(struct sta_info
*sta
)
196 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
199 if (sta
->plink_state
== NL80211_PLINK_ESTAB
)
200 changed
= mesh_plink_dec_estab_count(sdata
);
201 sta
->plink_state
= NL80211_PLINK_BLOCKED
;
202 mesh_path_flush_by_nexthop(sta
);
204 ieee80211_mps_sta_status_update(sta
);
205 changed
|= ieee80211_mps_local_status_update(sdata
);
211 * mesh_plink_deactivate - deactivate mesh peer link
213 * @sta: mesh peer link to deactivate
215 * All mesh paths with this peer as next hop will be flushed
217 u32
mesh_plink_deactivate(struct sta_info
*sta
)
219 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
222 spin_lock_bh(&sta
->lock
);
223 changed
= __mesh_plink_deactivate(sta
);
224 sta
->reason
= cpu_to_le16(WLAN_REASON_MESH_PEER_CANCELED
);
225 mesh_plink_frame_tx(sdata
, WLAN_SP_MESH_PEERING_CLOSE
,
226 sta
->sta
.addr
, sta
->llid
, sta
->plid
,
228 spin_unlock_bh(&sta
->lock
);
233 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data
*sdata
,
234 enum ieee80211_self_protected_actioncode action
,
235 u8
*da
, __le16 llid
, __le16 plid
, __le16 reason
) {
236 struct ieee80211_local
*local
= sdata
->local
;
238 struct ieee80211_tx_info
*info
;
239 struct ieee80211_mgmt
*mgmt
;
240 bool include_plid
= false;
241 u16 peering_proto
= 0;
243 int hdr_len
= offsetof(struct ieee80211_mgmt
, u
.action
.u
.self_prot
) +
244 sizeof(mgmt
->u
.action
.u
.self_prot
);
247 skb
= dev_alloc_skb(local
->tx_headroom
+
249 2 + /* capability info */
251 2 + 8 + /* supported rates */
252 2 + (IEEE80211_MAX_SUPP_RATES
- 8) +
253 2 + sdata
->u
.mesh
.mesh_id_len
+
254 2 + sizeof(struct ieee80211_meshconf_ie
) +
255 2 + sizeof(struct ieee80211_ht_cap
) +
256 2 + sizeof(struct ieee80211_ht_operation
) +
257 2 + 8 + /* peering IE */
258 sdata
->u
.mesh
.ie_len
);
261 info
= IEEE80211_SKB_CB(skb
);
262 skb_reserve(skb
, local
->tx_headroom
);
263 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, hdr_len
);
264 memset(mgmt
, 0, hdr_len
);
265 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
266 IEEE80211_STYPE_ACTION
);
267 memcpy(mgmt
->da
, da
, ETH_ALEN
);
268 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
269 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
270 mgmt
->u
.action
.category
= WLAN_CATEGORY_SELF_PROTECTED
;
271 mgmt
->u
.action
.u
.self_prot
.action_code
= action
;
273 if (action
!= WLAN_SP_MESH_PEERING_CLOSE
) {
274 enum ieee80211_band band
= ieee80211_get_sdata_band(sdata
);
276 /* capability info */
277 pos
= skb_put(skb
, 2);
279 if (action
== WLAN_SP_MESH_PEERING_CONFIRM
) {
281 pos
= skb_put(skb
, 2);
282 memcpy(pos
+ 2, &plid
, 2);
284 if (ieee80211_add_srates_ie(sdata
, skb
, true, band
) ||
285 ieee80211_add_ext_srates_ie(sdata
, skb
, true, band
) ||
286 mesh_add_rsn_ie(skb
, sdata
) ||
287 mesh_add_meshid_ie(skb
, sdata
) ||
288 mesh_add_meshconf_ie(skb
, sdata
))
290 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
291 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
292 if (mesh_add_meshid_ie(skb
, sdata
))
296 /* Add Mesh Peering Management element */
298 case WLAN_SP_MESH_PEERING_OPEN
:
300 case WLAN_SP_MESH_PEERING_CONFIRM
:
304 case WLAN_SP_MESH_PEERING_CLOSE
:
309 ie_len
+= 2; /* reason code */
316 if (WARN_ON(skb_tailroom(skb
) < 2 + ie_len
))
319 pos
= skb_put(skb
, 2 + ie_len
);
320 *pos
++ = WLAN_EID_PEER_MGMT
;
322 memcpy(pos
, &peering_proto
, 2);
324 memcpy(pos
, &llid
, 2);
327 memcpy(pos
, &plid
, 2);
330 if (action
== WLAN_SP_MESH_PEERING_CLOSE
) {
331 memcpy(pos
, &reason
, 2);
335 if (action
!= WLAN_SP_MESH_PEERING_CLOSE
) {
336 if (mesh_add_ht_cap_ie(skb
, sdata
) ||
337 mesh_add_ht_oper_ie(skb
, sdata
))
341 if (mesh_add_vendor_ies(skb
, sdata
))
344 ieee80211_tx_skb(sdata
, skb
);
351 static void mesh_sta_info_init(struct ieee80211_sub_if_data
*sdata
,
352 struct sta_info
*sta
,
353 struct ieee802_11_elems
*elems
, bool insert
)
355 struct ieee80211_local
*local
= sdata
->local
;
356 enum ieee80211_band band
= ieee80211_get_sdata_band(sdata
);
357 struct ieee80211_supported_band
*sband
;
358 u32 rates
, basic_rates
= 0, changed
= 0;
360 sband
= local
->hw
.wiphy
->bands
[band
];
361 rates
= ieee80211_sta_get_rates(local
, elems
, band
, &basic_rates
);
363 spin_lock_bh(&sta
->lock
);
364 sta
->last_rx
= jiffies
;
366 /* rates and capabilities don't change during peering */
367 if (sta
->plink_state
== NL80211_PLINK_ESTAB
)
370 if (sta
->sta
.supp_rates
[band
] != rates
)
371 changed
|= IEEE80211_RC_SUPP_RATES_CHANGED
;
372 sta
->sta
.supp_rates
[band
] = rates
;
373 if (elems
->ht_cap_elem
&&
374 sdata
->vif
.bss_conf
.chandef
.width
!= NL80211_CHAN_WIDTH_20_NOHT
)
375 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata
, sband
,
379 memset(&sta
->sta
.ht_cap
, 0, sizeof(sta
->sta
.ht_cap
));
381 if (elems
->ht_operation
) {
382 struct cfg80211_chan_def chandef
;
384 if (!(elems
->ht_operation
->ht_param
&
385 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY
))
386 sta
->sta
.ht_cap
.cap
&=
387 ~IEEE80211_HT_CAP_SUP_WIDTH_20_40
;
388 ieee80211_ht_oper_to_chandef(sdata
->vif
.bss_conf
.chandef
.chan
,
389 elems
->ht_operation
, &chandef
);
390 if (sta
->ch_width
!= chandef
.width
)
391 changed
|= IEEE80211_RC_BW_CHANGED
;
392 sta
->ch_width
= chandef
.width
;
396 rate_control_rate_init(sta
);
398 rate_control_rate_update(local
, sband
, sta
, changed
);
400 spin_unlock_bh(&sta
->lock
);
403 static struct sta_info
*
404 __mesh_sta_info_alloc(struct ieee80211_sub_if_data
*sdata
, u8
*hw_addr
)
406 struct sta_info
*sta
;
408 if (sdata
->local
->num_sta
>= MESH_MAX_PLINKS
)
411 sta
= sta_info_alloc(sdata
, hw_addr
, GFP_KERNEL
);
415 sta
->plink_state
= NL80211_PLINK_LISTEN
;
416 init_timer(&sta
->plink_timer
);
418 sta_info_pre_move_state(sta
, IEEE80211_STA_AUTH
);
419 sta_info_pre_move_state(sta
, IEEE80211_STA_ASSOC
);
420 sta_info_pre_move_state(sta
, IEEE80211_STA_AUTHORIZED
);
422 set_sta_flag(sta
, WLAN_STA_WME
);
427 static struct sta_info
*
428 mesh_sta_info_alloc(struct ieee80211_sub_if_data
*sdata
, u8
*addr
,
429 struct ieee802_11_elems
*elems
)
431 struct sta_info
*sta
= NULL
;
433 /* Userspace handles peer allocation when security is enabled */
434 if (sdata
->u
.mesh
.security
& IEEE80211_MESH_SEC_AUTHED
)
435 cfg80211_notify_new_peer_candidate(sdata
->dev
, addr
,
440 sta
= __mesh_sta_info_alloc(sdata
, addr
);
446 * mesh_sta_info_get - return mesh sta info entry for @addr.
448 * @sdata: local meshif
449 * @addr: peer's address
450 * @elems: IEs from beacon or mesh peering frame.
452 * Return existing or newly allocated sta_info under RCU read lock.
453 * (re)initialize with given IEs.
455 static struct sta_info
*
456 mesh_sta_info_get(struct ieee80211_sub_if_data
*sdata
,
457 u8
*addr
, struct ieee802_11_elems
*elems
) __acquires(RCU
)
459 struct sta_info
*sta
= NULL
;
462 sta
= sta_info_get(sdata
, addr
);
464 mesh_sta_info_init(sdata
, sta
, elems
, false);
467 /* can't run atomic */
468 sta
= mesh_sta_info_alloc(sdata
, addr
, elems
);
474 mesh_sta_info_init(sdata
, sta
, elems
, true);
476 if (sta_info_insert_rcu(sta
))
484 * mesh_neighbour_update - update or initialize new mesh neighbor.
486 * @sdata: local meshif
487 * @addr: peer's address
488 * @elems: IEs from beacon or mesh peering frame
490 * Initiates peering if appropriate.
492 void mesh_neighbour_update(struct ieee80211_sub_if_data
*sdata
,
494 struct ieee802_11_elems
*elems
)
496 struct sta_info
*sta
;
499 sta
= mesh_sta_info_get(sdata
, hw_addr
, elems
);
503 if (mesh_peer_accepts_plinks(elems
) &&
504 sta
->plink_state
== NL80211_PLINK_LISTEN
&&
505 sdata
->u
.mesh
.accepting_plinks
&&
506 sdata
->u
.mesh
.mshcfg
.auto_open_plinks
&&
507 rssi_threshold_check(sta
, sdata
))
508 changed
= mesh_plink_open(sta
);
510 ieee80211_mps_frame_release(sta
, elems
);
513 ieee80211_bss_info_change_notify(sdata
, changed
);
516 static void mesh_plink_timer(unsigned long data
)
518 struct sta_info
*sta
;
519 __le16 llid
, plid
, reason
;
520 struct ieee80211_sub_if_data
*sdata
;
521 struct mesh_config
*mshcfg
;
524 * This STA is valid because sta_info_destroy() will
525 * del_timer_sync() this timer after having made sure
526 * it cannot be readded (by deleting the plink.)
528 sta
= (struct sta_info
*) data
;
530 if (sta
->sdata
->local
->quiescing
) {
531 sta
->plink_timer_was_running
= true;
535 spin_lock_bh(&sta
->lock
);
536 if (sta
->ignore_plink_timer
) {
537 sta
->ignore_plink_timer
= false;
538 spin_unlock_bh(&sta
->lock
);
542 "Mesh plink timer for %pM fired on state %d\n",
543 sta
->sta
.addr
, sta
->plink_state
);
548 mshcfg
= &sdata
->u
.mesh
.mshcfg
;
550 switch (sta
->plink_state
) {
551 case NL80211_PLINK_OPN_RCVD
:
552 case NL80211_PLINK_OPN_SNT
:
554 if (sta
->plink_retries
< mshcfg
->dot11MeshMaxRetries
) {
557 "Mesh plink for %pM (retry, timeout): %d %d\n",
558 sta
->sta
.addr
, sta
->plink_retries
,
560 get_random_bytes(&rand
, sizeof(u32
));
561 sta
->plink_timeout
= sta
->plink_timeout
+
562 rand
% sta
->plink_timeout
;
563 ++sta
->plink_retries
;
564 mod_plink_timer(sta
, sta
->plink_timeout
);
565 spin_unlock_bh(&sta
->lock
);
566 mesh_plink_frame_tx(sdata
, WLAN_SP_MESH_PEERING_OPEN
,
567 sta
->sta
.addr
, llid
, 0, 0);
570 reason
= cpu_to_le16(WLAN_REASON_MESH_MAX_RETRIES
);
571 /* fall through on else */
572 case NL80211_PLINK_CNF_RCVD
:
575 reason
= cpu_to_le16(WLAN_REASON_MESH_CONFIRM_TIMEOUT
);
576 sta
->plink_state
= NL80211_PLINK_HOLDING
;
577 mod_plink_timer(sta
, mshcfg
->dot11MeshHoldingTimeout
);
578 spin_unlock_bh(&sta
->lock
);
579 mesh_plink_frame_tx(sdata
, WLAN_SP_MESH_PEERING_CLOSE
,
580 sta
->sta
.addr
, llid
, plid
, reason
);
582 case NL80211_PLINK_HOLDING
:
584 del_timer(&sta
->plink_timer
);
585 mesh_plink_fsm_restart(sta
);
586 spin_unlock_bh(&sta
->lock
);
589 spin_unlock_bh(&sta
->lock
);
595 void mesh_plink_quiesce(struct sta_info
*sta
)
597 if (!ieee80211_vif_is_mesh(&sta
->sdata
->vif
))
600 /* no kernel mesh sta timers have been initialized */
601 if (sta
->sdata
->u
.mesh
.security
!= IEEE80211_MESH_SEC_NONE
)
604 if (del_timer_sync(&sta
->plink_timer
))
605 sta
->plink_timer_was_running
= true;
608 void mesh_plink_restart(struct sta_info
*sta
)
610 if (sta
->plink_timer_was_running
) {
611 add_timer(&sta
->plink_timer
);
612 sta
->plink_timer_was_running
= false;
617 static inline void mesh_plink_timer_set(struct sta_info
*sta
, int timeout
)
619 sta
->plink_timer
.expires
= jiffies
+ (HZ
* timeout
/ 1000);
620 sta
->plink_timer
.data
= (unsigned long) sta
;
621 sta
->plink_timer
.function
= mesh_plink_timer
;
622 sta
->plink_timeout
= timeout
;
623 add_timer(&sta
->plink_timer
);
626 u32
mesh_plink_open(struct sta_info
*sta
)
629 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
632 if (!test_sta_flag(sta
, WLAN_STA_AUTH
))
635 spin_lock_bh(&sta
->lock
);
636 get_random_bytes(&llid
, 2);
638 if (sta
->plink_state
!= NL80211_PLINK_LISTEN
&&
639 sta
->plink_state
!= NL80211_PLINK_BLOCKED
) {
640 spin_unlock_bh(&sta
->lock
);
643 sta
->plink_state
= NL80211_PLINK_OPN_SNT
;
644 mesh_plink_timer_set(sta
, sdata
->u
.mesh
.mshcfg
.dot11MeshRetryTimeout
);
645 spin_unlock_bh(&sta
->lock
);
647 "Mesh plink: starting establishment with %pM\n",
650 /* set the non-peer mode to active during peering */
651 changed
= ieee80211_mps_local_status_update(sdata
);
653 mesh_plink_frame_tx(sdata
, WLAN_SP_MESH_PEERING_OPEN
,
654 sta
->sta
.addr
, llid
, 0, 0);
658 u32
mesh_plink_block(struct sta_info
*sta
)
662 spin_lock_bh(&sta
->lock
);
663 changed
= __mesh_plink_deactivate(sta
);
664 sta
->plink_state
= NL80211_PLINK_BLOCKED
;
665 spin_unlock_bh(&sta
->lock
);
671 void mesh_rx_plink_frame(struct ieee80211_sub_if_data
*sdata
, struct ieee80211_mgmt
*mgmt
,
672 size_t len
, struct ieee80211_rx_status
*rx_status
)
674 struct mesh_config
*mshcfg
= &sdata
->u
.mesh
.mshcfg
;
675 struct ieee802_11_elems elems
;
676 struct sta_info
*sta
;
677 enum plink_event event
;
678 enum ieee80211_self_protected_actioncode ftype
;
680 bool matches_local
= true;
684 __le16 plid
, llid
, reason
;
685 static const char *mplstates
[] = {
686 [NL80211_PLINK_LISTEN
] = "LISTEN",
687 [NL80211_PLINK_OPN_SNT
] = "OPN-SNT",
688 [NL80211_PLINK_OPN_RCVD
] = "OPN-RCVD",
689 [NL80211_PLINK_CNF_RCVD
] = "CNF_RCVD",
690 [NL80211_PLINK_ESTAB
] = "ESTAB",
691 [NL80211_PLINK_HOLDING
] = "HOLDING",
692 [NL80211_PLINK_BLOCKED
] = "BLOCKED"
695 /* need action_code, aux */
696 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 3)
699 if (is_multicast_ether_addr(mgmt
->da
)) {
701 "Mesh plink: ignore frame from multicast address\n");
705 baseaddr
= mgmt
->u
.action
.u
.self_prot
.variable
;
706 baselen
= (u8
*) mgmt
->u
.action
.u
.self_prot
.variable
- (u8
*) mgmt
;
707 if (mgmt
->u
.action
.u
.self_prot
.action_code
==
708 WLAN_SP_MESH_PEERING_CONFIRM
) {
712 ieee802_11_parse_elems(baseaddr
, len
- baselen
, &elems
);
713 if (!elems
.peering
) {
715 "Mesh plink: missing necessary peer link ie\n");
719 sdata
->u
.mesh
.security
== IEEE80211_MESH_SEC_NONE
) {
721 "Mesh plink: can't establish link with secure peer\n");
725 ftype
= mgmt
->u
.action
.u
.self_prot
.action_code
;
726 ie_len
= elems
.peering_len
;
727 if ((ftype
== WLAN_SP_MESH_PEERING_OPEN
&& ie_len
!= 4) ||
728 (ftype
== WLAN_SP_MESH_PEERING_CONFIRM
&& ie_len
!= 6) ||
729 (ftype
== WLAN_SP_MESH_PEERING_CLOSE
&& ie_len
!= 6
732 "Mesh plink: incorrect plink ie length %d %d\n",
737 if (ftype
!= WLAN_SP_MESH_PEERING_CLOSE
&&
738 (!elems
.mesh_id
|| !elems
.mesh_config
)) {
739 mpl_dbg(sdata
, "Mesh plink: missing necessary ie\n");
742 /* Note the lines below are correct, the llid in the frame is the plid
743 * from the point of view of this host.
745 memcpy(&plid
, PLINK_GET_LLID(elems
.peering
), 2);
746 if (ftype
== WLAN_SP_MESH_PEERING_CONFIRM
||
747 (ftype
== WLAN_SP_MESH_PEERING_CLOSE
&& ie_len
== 8))
748 memcpy(&llid
, PLINK_GET_PLID(elems
.peering
), 2);
750 /* WARNING: Only for sta pointer, is dropped & re-acquired */
753 sta
= sta_info_get(sdata
, mgmt
->sa
);
754 if (!sta
&& ftype
!= WLAN_SP_MESH_PEERING_OPEN
) {
755 mpl_dbg(sdata
, "Mesh plink: cls or cnf from unknown peer\n");
760 if (ftype
== WLAN_SP_MESH_PEERING_OPEN
&&
761 !rssi_threshold_check(sta
, sdata
)) {
762 mpl_dbg(sdata
, "Mesh plink: %pM does not meet rssi threshold\n",
768 if (sta
&& !test_sta_flag(sta
, WLAN_STA_AUTH
)) {
769 mpl_dbg(sdata
, "Mesh plink: Action frame from non-authed peer\n");
774 if (sta
&& sta
->plink_state
== NL80211_PLINK_BLOCKED
) {
779 /* Now we will figure out the appropriate event... */
780 event
= PLINK_UNDEFINED
;
781 if (ftype
!= WLAN_SP_MESH_PEERING_CLOSE
&&
782 !mesh_matches_local(sdata
, &elems
)) {
783 matches_local
= false;
785 case WLAN_SP_MESH_PEERING_OPEN
:
788 case WLAN_SP_MESH_PEERING_CONFIRM
:
796 if (!sta
&& !matches_local
) {
798 reason
= cpu_to_le16(WLAN_REASON_MESH_CONFIG
);
800 mesh_plink_frame_tx(sdata
, WLAN_SP_MESH_PEERING_CLOSE
,
801 mgmt
->sa
, llid
, plid
, reason
);
804 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
805 if (!mesh_plink_free_count(sdata
)) {
806 mpl_dbg(sdata
, "Mesh plink error: no more free plinks\n");
811 } else if (matches_local
) {
813 case WLAN_SP_MESH_PEERING_OPEN
:
814 if (!mesh_plink_free_count(sdata
) ||
815 (sta
->plid
&& sta
->plid
!= plid
))
820 case WLAN_SP_MESH_PEERING_CONFIRM
:
821 if (!mesh_plink_free_count(sdata
) ||
822 (sta
->llid
!= llid
|| sta
->plid
!= plid
))
827 case WLAN_SP_MESH_PEERING_CLOSE
:
828 if (sta
->plink_state
== NL80211_PLINK_ESTAB
)
829 /* Do not check for llid or plid. This does not
830 * follow the standard but since multiple plinks
831 * per sta are not supported, it is necessary in
832 * order to avoid a livelock when MP A sees an
833 * establish peer link to MP B but MP B does not
834 * see it. This can be caused by a timeout in
835 * B's peer link establishment or B beign
839 else if (sta
->plid
!= plid
)
841 else if (ie_len
== 7 && sta
->llid
!= llid
)
847 mpl_dbg(sdata
, "Mesh plink: unknown frame subtype\n");
853 if (event
== OPN_ACPT
) {
855 /* allocate sta entry if necessary and update info */
856 sta
= mesh_sta_info_get(sdata
, mgmt
->sa
, &elems
);
858 mpl_dbg(sdata
, "Mesh plink: failed to init peer!\n");
865 "Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n",
866 mgmt
->sa
, mplstates
[sta
->plink_state
],
867 le16_to_cpu(sta
->llid
), le16_to_cpu(sta
->plid
),
870 spin_lock_bh(&sta
->lock
);
871 switch (sta
->plink_state
) {
872 /* spin_unlock as soon as state is updated at each case */
873 case NL80211_PLINK_LISTEN
:
876 mesh_plink_fsm_restart(sta
);
877 spin_unlock_bh(&sta
->lock
);
880 sta
->plink_state
= NL80211_PLINK_OPN_RCVD
;
882 get_random_bytes(&llid
, 2);
884 mesh_plink_timer_set(sta
,
885 mshcfg
->dot11MeshRetryTimeout
);
887 /* set the non-peer mode to active during peering */
888 changed
|= ieee80211_mps_local_status_update(sdata
);
890 spin_unlock_bh(&sta
->lock
);
891 mesh_plink_frame_tx(sdata
,
892 WLAN_SP_MESH_PEERING_OPEN
,
893 sta
->sta
.addr
, llid
, 0, 0);
894 mesh_plink_frame_tx(sdata
,
895 WLAN_SP_MESH_PEERING_CONFIRM
,
896 sta
->sta
.addr
, llid
, plid
, 0);
899 spin_unlock_bh(&sta
->lock
);
904 case NL80211_PLINK_OPN_SNT
:
908 reason
= cpu_to_le16(WLAN_REASON_MESH_CONFIG
);
911 reason
= cpu_to_le16(WLAN_REASON_MESH_CLOSE
);
912 sta
->reason
= reason
;
913 sta
->plink_state
= NL80211_PLINK_HOLDING
;
914 if (!mod_plink_timer(sta
,
915 mshcfg
->dot11MeshHoldingTimeout
))
916 sta
->ignore_plink_timer
= true;
919 spin_unlock_bh(&sta
->lock
);
920 mesh_plink_frame_tx(sdata
,
921 WLAN_SP_MESH_PEERING_CLOSE
,
922 sta
->sta
.addr
, llid
, plid
, reason
);
925 /* retry timer is left untouched */
926 sta
->plink_state
= NL80211_PLINK_OPN_RCVD
;
929 spin_unlock_bh(&sta
->lock
);
930 mesh_plink_frame_tx(sdata
,
931 WLAN_SP_MESH_PEERING_CONFIRM
,
932 sta
->sta
.addr
, llid
, plid
, 0);
935 sta
->plink_state
= NL80211_PLINK_CNF_RCVD
;
936 if (!mod_plink_timer(sta
,
937 mshcfg
->dot11MeshConfirmTimeout
))
938 sta
->ignore_plink_timer
= true;
940 spin_unlock_bh(&sta
->lock
);
943 spin_unlock_bh(&sta
->lock
);
948 case NL80211_PLINK_OPN_RCVD
:
952 reason
= cpu_to_le16(WLAN_REASON_MESH_CONFIG
);
955 reason
= cpu_to_le16(WLAN_REASON_MESH_CLOSE
);
956 sta
->reason
= reason
;
957 sta
->plink_state
= NL80211_PLINK_HOLDING
;
958 if (!mod_plink_timer(sta
,
959 mshcfg
->dot11MeshHoldingTimeout
))
960 sta
->ignore_plink_timer
= true;
963 spin_unlock_bh(&sta
->lock
);
964 mesh_plink_frame_tx(sdata
, WLAN_SP_MESH_PEERING_CLOSE
,
965 sta
->sta
.addr
, llid
, plid
, reason
);
969 spin_unlock_bh(&sta
->lock
);
970 mesh_plink_frame_tx(sdata
,
971 WLAN_SP_MESH_PEERING_CONFIRM
,
972 sta
->sta
.addr
, llid
, plid
, 0);
975 del_timer(&sta
->plink_timer
);
976 sta
->plink_state
= NL80211_PLINK_ESTAB
;
977 spin_unlock_bh(&sta
->lock
);
978 changed
|= mesh_plink_inc_estab_count(sdata
);
979 changed
|= mesh_set_ht_prot_mode(sdata
);
980 changed
|= mesh_set_short_slot_time(sdata
);
981 mpl_dbg(sdata
, "Mesh plink with %pM ESTABLISHED\n",
983 ieee80211_mps_sta_status_update(sta
);
984 changed
|= ieee80211_mps_set_sta_local_pm(sta
,
988 spin_unlock_bh(&sta
->lock
);
993 case NL80211_PLINK_CNF_RCVD
:
997 reason
= cpu_to_le16(WLAN_REASON_MESH_CONFIG
);
1000 reason
= cpu_to_le16(WLAN_REASON_MESH_CLOSE
);
1001 sta
->reason
= reason
;
1002 sta
->plink_state
= NL80211_PLINK_HOLDING
;
1003 if (!mod_plink_timer(sta
,
1004 mshcfg
->dot11MeshHoldingTimeout
))
1005 sta
->ignore_plink_timer
= true;
1008 spin_unlock_bh(&sta
->lock
);
1009 mesh_plink_frame_tx(sdata
,
1010 WLAN_SP_MESH_PEERING_CLOSE
,
1011 sta
->sta
.addr
, llid
, plid
, reason
);
1014 del_timer(&sta
->plink_timer
);
1015 sta
->plink_state
= NL80211_PLINK_ESTAB
;
1016 spin_unlock_bh(&sta
->lock
);
1017 changed
|= mesh_plink_inc_estab_count(sdata
);
1018 changed
|= mesh_set_ht_prot_mode(sdata
);
1019 changed
|= mesh_set_short_slot_time(sdata
);
1020 mpl_dbg(sdata
, "Mesh plink with %pM ESTABLISHED\n",
1022 mesh_plink_frame_tx(sdata
,
1023 WLAN_SP_MESH_PEERING_CONFIRM
,
1024 sta
->sta
.addr
, llid
, plid
, 0);
1025 ieee80211_mps_sta_status_update(sta
);
1026 changed
|= ieee80211_mps_set_sta_local_pm(sta
,
1027 mshcfg
->power_mode
);
1030 spin_unlock_bh(&sta
->lock
);
1035 case NL80211_PLINK_ESTAB
:
1038 reason
= cpu_to_le16(WLAN_REASON_MESH_CLOSE
);
1039 sta
->reason
= reason
;
1040 changed
|= __mesh_plink_deactivate(sta
);
1041 sta
->plink_state
= NL80211_PLINK_HOLDING
;
1043 mod_plink_timer(sta
, mshcfg
->dot11MeshHoldingTimeout
);
1044 spin_unlock_bh(&sta
->lock
);
1045 changed
|= mesh_set_ht_prot_mode(sdata
);
1046 changed
|= mesh_set_short_slot_time(sdata
);
1047 mesh_plink_frame_tx(sdata
, WLAN_SP_MESH_PEERING_CLOSE
,
1048 sta
->sta
.addr
, llid
, plid
, reason
);
1052 spin_unlock_bh(&sta
->lock
);
1053 mesh_plink_frame_tx(sdata
,
1054 WLAN_SP_MESH_PEERING_CONFIRM
,
1055 sta
->sta
.addr
, llid
, plid
, 0);
1058 spin_unlock_bh(&sta
->lock
);
1062 case NL80211_PLINK_HOLDING
:
1065 if (del_timer(&sta
->plink_timer
))
1066 sta
->ignore_plink_timer
= 1;
1067 mesh_plink_fsm_restart(sta
);
1068 spin_unlock_bh(&sta
->lock
);
1075 reason
= sta
->reason
;
1076 spin_unlock_bh(&sta
->lock
);
1077 mesh_plink_frame_tx(sdata
, WLAN_SP_MESH_PEERING_CLOSE
,
1078 sta
->sta
.addr
, llid
, plid
, reason
);
1081 spin_unlock_bh(&sta
->lock
);
1085 /* should not get here, PLINK_BLOCKED is dealt with at the
1086 * beginning of the function
1088 spin_unlock_bh(&sta
->lock
);
1095 ieee80211_bss_info_change_notify(sdata
, changed
);