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Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +01001/*
Rui Paulo264d9b72009-11-09 23:46:58 +00002 * Copyright (c) 2008, 2009 open80211s Ltd.
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +01003 * Author: Luis Carlos Cobo <luisca@cozybit.com>
4 *
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.
8 */
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09009#include <linux/gfp.h>
Johannes Berg902acc72008-02-23 15:17:19 +010010#include <linux/kernel.h>
11#include <linux/random.h>
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +010012#include "ieee80211_i.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040013#include "rate.h"
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +010014#include "mesh.h"
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +010015
Bob Copelanda69bd8e2015-07-14 08:31:58 -040016#define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2)
Thomas Pedersen8db09852011-08-12 20:01:00 -070017#define PLINK_GET_LLID(p) (p + 2)
18#define PLINK_GET_PLID(p) (p + 4)
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +010019
Johannes Berg433f5bc2015-06-17 10:31:00 +020020#define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \
Nicholas Mc Guirecc57ac52015-03-02 04:54:13 -050021 jiffies + msecs_to_jiffies(t)))
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +010022
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +010023enum plink_event {
24 PLINK_UNDEFINED,
25 OPN_ACPT,
26 OPN_RJCT,
27 OPN_IGNR,
28 CNF_ACPT,
29 CNF_RJCT,
30 CNF_IGNR,
31 CLS_ACPT,
32 CLS_IGNR
33};
34
Thomas Pedersen95e48ad2013-02-16 10:41:05 -080035static 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"
43};
44
45static 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"
55};
56
Bob Copeland36c9bb22013-11-05 11:16:54 -080057/* We only need a valid sta if user configured a minimum rssi_threshold. */
58static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
59 struct sta_info *sta)
60{
61 s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
62 return rssi_threshold == 0 ||
Johannes Berge5a9f8d2015-10-16 17:54:47 +020063 (sta &&
64 (s8)-ewma_signal_read(&sta->rx_stats.avg_signal) >
65 rssi_threshold);
Bob Copeland36c9bb22013-11-05 11:16:54 -080066}
67
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +010068/**
69 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
70 *
Rui Paulo23c7a292009-11-09 23:46:42 +000071 * @sta: mesh peer link to restart
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +010072 *
Johannes Berg433f5bc2015-06-17 10:31:00 +020073 * Locking: this function must be called holding sta->mesh->plink_lock
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +010074 */
75static inline void mesh_plink_fsm_restart(struct sta_info *sta)
76{
Johannes Berg433f5bc2015-06-17 10:31:00 +020077 lockdep_assert_held(&sta->mesh->plink_lock);
78 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
79 sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0;
80 sta->mesh->plink_retries = 0;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +010081}
82
Thomas Pedersen3b144652013-01-26 16:39:55 -080083/*
84 * mesh_set_short_slot_time - enable / disable ERP short slot time.
85 *
86 * The standard indirectly mandates mesh STAs to turn off short slot time by
87 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
88 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
89 * MBSS support ERP rates.
90 *
91 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
92 */
93static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
94{
95 struct ieee80211_local *local = sdata->local;
96 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
97 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
98 struct sta_info *sta;
99 u32 erp_rates = 0, changed = 0;
100 int i;
101 bool short_slot = false;
102
103 if (band == IEEE80211_BAND_5GHZ) {
104 /* (IEEE 802.11-2012 19.4.5) */
105 short_slot = true;
106 goto out;
Johannes Bergea1b2b452015-06-02 20:15:49 +0200107 } else if (band != IEEE80211_BAND_2GHZ)
Thomas Pedersen3b144652013-01-26 16:39:55 -0800108 goto out;
109
110 for (i = 0; i < sband->n_bitrates; i++)
111 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
112 erp_rates |= BIT(i);
113
114 if (!erp_rates)
115 goto out;
116
117 rcu_read_lock();
118 list_for_each_entry_rcu(sta, &local->sta_list, list) {
119 if (sdata != sta->sdata ||
Johannes Berg433f5bc2015-06-17 10:31:00 +0200120 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
Thomas Pedersen3b144652013-01-26 16:39:55 -0800121 continue;
122
123 short_slot = false;
124 if (erp_rates & sta->sta.supp_rates[band])
125 short_slot = true;
126 else
127 break;
128 }
129 rcu_read_unlock();
130
131out:
132 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
133 sdata->vif.bss_conf.use_short_slot = short_slot;
134 changed = BSS_CHANGED_ERP_SLOT;
135 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
136 sdata->vif.addr, short_slot);
137 }
138 return changed;
139}
140
Ben Hutchings2c530402012-07-10 10:55:09 +0000141/**
Ashok Nagarajancbf93222012-05-07 21:00:31 -0700142 * mesh_set_ht_prot_mode - set correct HT protection mode
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700143 *
Ashok Nagarajancbf93222012-05-07 21:00:31 -0700144 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
145 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
146 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
147 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
148 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
149 * HT20 peer is present. Otherwise no-protection mode is selected.
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700150 */
151static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
152{
153 struct ieee80211_local *local = sdata->local;
154 struct sta_info *sta;
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700155 u16 ht_opmode;
156 bool non_ht_sta = false, ht20_sta = false;
157
Simon Wunderlich0418a442013-05-16 13:00:31 +0200158 switch (sdata->vif.bss_conf.chandef.width) {
159 case NL80211_CHAN_WIDTH_20_NOHT:
160 case NL80211_CHAN_WIDTH_5:
161 case NL80211_CHAN_WIDTH_10:
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700162 return 0;
Simon Wunderlich0418a442013-05-16 13:00:31 +0200163 default:
164 break;
165 }
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700166
167 rcu_read_lock();
168 list_for_each_entry_rcu(sta, &local->sta_list, list) {
Ashok Nagarajancbf93222012-05-07 21:00:31 -0700169 if (sdata != sta->sdata ||
Johannes Berg433f5bc2015-06-17 10:31:00 +0200170 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
Ashok Nagarajancbf93222012-05-07 21:00:31 -0700171 continue;
172
Thomas Pedersen52ac8c42013-02-16 10:41:04 -0800173 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
174 continue;
175
176 if (!sta->sta.ht_cap.ht_supported) {
177 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
178 sta->sta.addr);
Ashok Nagarajancbf93222012-05-07 21:00:31 -0700179 non_ht_sta = true;
Ashok Nagarajancbf93222012-05-07 21:00:31 -0700180 break;
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700181 }
Thomas Pedersen52ac8c42013-02-16 10:41:04 -0800182
183 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
184 ht20_sta = true;
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700185 }
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700186 rcu_read_unlock();
187
188 if (non_ht_sta)
189 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
Johannes Berg466f3102012-07-25 13:51:49 +0200190 else if (ht20_sta &&
Johannes Berg4bf88532012-11-09 11:39:59 +0100191 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700192 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
193 else
194 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
195
Thomas Pedersen52ac8c42013-02-16 10:41:04 -0800196 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
197 return 0;
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700198
Thomas Pedersen52ac8c42013-02-16 10:41:04 -0800199 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
200 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
201 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
202 return BSS_CHANGED_HT;
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700203}
204
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200205static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
Bob Copelanda69bd8e2015-07-14 08:31:58 -0400206 struct sta_info *sta,
Johannes Bergbf7cd942013-02-15 14:40:31 +0100207 enum ieee80211_self_protected_actioncode action,
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800208 u8 *da, u16 llid, u16 plid, u16 reason)
Johannes Bergbf7cd942013-02-15 14:40:31 +0100209{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200210 struct ieee80211_local *local = sdata->local;
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700211 struct sk_buff *skb;
Thomas Pedersene7570df2012-08-03 12:21:34 -0700212 struct ieee80211_tx_info *info;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100213 struct ieee80211_mgmt *mgmt;
214 bool include_plid = false;
Thomas Pedersen8db09852011-08-12 20:01:00 -0700215 u16 peering_proto = 0;
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700216 u8 *pos, ie_len = 4;
217 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
218 sizeof(mgmt->u.action.u.self_prot);
Thomas Pedersenf609a432012-08-03 12:21:35 -0700219 int err = -ENOMEM;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100220
Javier Cardona65e8b0c2012-01-17 18:17:46 -0800221 skb = dev_alloc_skb(local->tx_headroom +
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700222 hdr_len +
223 2 + /* capability info */
224 2 + /* AID */
225 2 + 8 + /* supported rates */
226 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
227 2 + sdata->u.mesh.mesh_id_len +
228 2 + sizeof(struct ieee80211_meshconf_ie) +
Thomas Pedersen176f3602011-10-26 14:47:27 -0700229 2 + sizeof(struct ieee80211_ht_cap) +
Johannes Berg074d46d2012-03-15 19:45:16 +0100230 2 + sizeof(struct ieee80211_ht_operation) +
Bob Copelandc85fb532015-08-27 09:00:18 -0400231 2 + sizeof(struct ieee80211_vht_cap) +
232 2 + sizeof(struct ieee80211_vht_operation) +
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700233 2 + 8 + /* peering IE */
234 sdata->u.mesh.ie_len);
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100235 if (!skb)
Bob Copeland87d84c42013-11-05 11:16:57 -0800236 return err;
Thomas Pedersene7570df2012-08-03 12:21:34 -0700237 info = IEEE80211_SKB_CB(skb);
Javier Cardona65e8b0c2012-01-17 18:17:46 -0800238 skb_reserve(skb, local->tx_headroom);
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700239 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
240 memset(mgmt, 0, hdr_len);
Harvey Harrisone7827a72008-07-15 18:44:13 -0700241 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
242 IEEE80211_STYPE_ACTION);
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100243 memcpy(mgmt->da, da, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +0100244 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
Javier Cardona915b5c52011-05-03 16:57:10 -0700245 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
Thomas Pedersen8db09852011-08-12 20:01:00 -0700246 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
247 mgmt->u.action.u.self_prot.action_code = action;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100248
Thomas Pedersen8db09852011-08-12 20:01:00 -0700249 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
Johannes Berg55de9082012-07-26 17:24:39 +0200250 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
251
Thomas Pedersen8db09852011-08-12 20:01:00 -0700252 /* capability info */
253 pos = skb_put(skb, 2);
254 memset(pos, 0, 2);
Thomas Pedersen54ef6562011-08-11 19:35:12 -0700255 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
Thomas Pedersen8db09852011-08-12 20:01:00 -0700256 /* AID */
257 pos = skb_put(skb, 2);
Bob Copelanda69bd8e2015-07-14 08:31:58 -0400258 put_unaligned_le16(sta->sta.aid, pos);
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100259 }
Johannes Berg55de9082012-07-26 17:24:39 +0200260 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
261 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
Johannes Bergbf7cd942013-02-15 14:40:31 +0100262 mesh_add_rsn_ie(sdata, skb) ||
263 mesh_add_meshid_ie(sdata, skb) ||
264 mesh_add_meshconf_ie(sdata, skb))
Thomas Pedersenf609a432012-08-03 12:21:35 -0700265 goto free;
Thomas Pedersen8db09852011-08-12 20:01:00 -0700266 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
Thomas Pedersene7570df2012-08-03 12:21:34 -0700267 info->flags |= IEEE80211_TX_CTL_NO_ACK;
Johannes Bergbf7cd942013-02-15 14:40:31 +0100268 if (mesh_add_meshid_ie(sdata, skb))
Thomas Pedersenf609a432012-08-03 12:21:35 -0700269 goto free;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100270 }
271
Thomas Pedersen8db09852011-08-12 20:01:00 -0700272 /* Add Mesh Peering Management element */
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100273 switch (action) {
Thomas Pedersen54ef6562011-08-11 19:35:12 -0700274 case WLAN_SP_MESH_PEERING_OPEN:
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100275 break;
Thomas Pedersen54ef6562011-08-11 19:35:12 -0700276 case WLAN_SP_MESH_PEERING_CONFIRM:
Thomas Pedersen8db09852011-08-12 20:01:00 -0700277 ie_len += 2;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100278 include_plid = true;
279 break;
Thomas Pedersen54ef6562011-08-11 19:35:12 -0700280 case WLAN_SP_MESH_PEERING_CLOSE:
Thomas Pedersen8db09852011-08-12 20:01:00 -0700281 if (plid) {
282 ie_len += 2;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100283 include_plid = true;
284 }
Thomas Pedersen8db09852011-08-12 20:01:00 -0700285 ie_len += 2; /* reason code */
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100286 break;
Thomas Pedersen8db09852011-08-12 20:01:00 -0700287 default:
Thomas Pedersenf609a432012-08-03 12:21:35 -0700288 err = -EINVAL;
289 goto free;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100290 }
291
Thomas Pedersen8db09852011-08-12 20:01:00 -0700292 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
Thomas Pedersenf609a432012-08-03 12:21:35 -0700293 goto free;
Thomas Pedersen8db09852011-08-12 20:01:00 -0700294
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100295 pos = skb_put(skb, 2 + ie_len);
Thomas Pedersen8db09852011-08-12 20:01:00 -0700296 *pos++ = WLAN_EID_PEER_MGMT;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100297 *pos++ = ie_len;
Thomas Pedersen8db09852011-08-12 20:01:00 -0700298 memcpy(pos, &peering_proto, 2);
299 pos += 2;
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800300 put_unaligned_le16(llid, pos);
Thomas Pedersen8db09852011-08-12 20:01:00 -0700301 pos += 2;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100302 if (include_plid) {
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800303 put_unaligned_le16(plid, pos);
Thomas Pedersen8db09852011-08-12 20:01:00 -0700304 pos += 2;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100305 }
Thomas Pedersen54ef6562011-08-11 19:35:12 -0700306 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800307 put_unaligned_le16(reason, pos);
Thomas Pedersen8db09852011-08-12 20:01:00 -0700308 pos += 2;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100309 }
Thomas Pedersen176f3602011-10-26 14:47:27 -0700310
311 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
Johannes Bergbf7cd942013-02-15 14:40:31 +0100312 if (mesh_add_ht_cap_ie(sdata, skb) ||
Bob Copelandc85fb532015-08-27 09:00:18 -0400313 mesh_add_ht_oper_ie(sdata, skb) ||
314 mesh_add_vht_cap_ie(sdata, skb) ||
315 mesh_add_vht_oper_ie(sdata, skb))
Thomas Pedersenf609a432012-08-03 12:21:35 -0700316 goto free;
Thomas Pedersen176f3602011-10-26 14:47:27 -0700317 }
318
Johannes Bergbf7cd942013-02-15 14:40:31 +0100319 if (mesh_add_vendor_ies(sdata, skb))
Thomas Pedersenf609a432012-08-03 12:21:35 -0700320 goto free;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100321
Johannes Berg62ae67b2009-11-18 18:42:05 +0100322 ieee80211_tx_skb(sdata, skb);
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100323 return 0;
Thomas Pedersenf609a432012-08-03 12:21:35 -0700324free:
325 kfree_skb(skb);
326 return err;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100327}
328
Bob Copelandfa87a652015-07-14 08:31:57 -0400329/**
330 * __mesh_plink_deactivate - deactivate mesh peer link
331 *
332 * @sta: mesh peer link to deactivate
333 *
334 * All mesh paths with this peer as next hop will be flushed
335 * Returns beacon changed flag if the beacon content changed.
336 *
337 * Locking: the caller must hold sta->mesh->plink_lock
338 */
339static u32 __mesh_plink_deactivate(struct sta_info *sta)
340{
341 struct ieee80211_sub_if_data *sdata = sta->sdata;
342 u32 changed = 0;
343
344 lockdep_assert_held(&sta->mesh->plink_lock);
345
346 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
347 changed = mesh_plink_dec_estab_count(sdata);
348 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
349 mesh_path_flush_by_nexthop(sta);
350
351 ieee80211_mps_sta_status_update(sta);
352 changed |= ieee80211_mps_set_sta_local_pm(sta,
353 NL80211_MESH_POWER_UNKNOWN);
354
355 return changed;
356}
357
358/**
359 * mesh_plink_deactivate - deactivate mesh peer link
360 *
361 * @sta: mesh peer link to deactivate
362 *
363 * All mesh paths with this peer as next hop will be flushed
364 */
365u32 mesh_plink_deactivate(struct sta_info *sta)
366{
367 struct ieee80211_sub_if_data *sdata = sta->sdata;
368 u32 changed;
369
370 spin_lock_bh(&sta->mesh->plink_lock);
371 changed = __mesh_plink_deactivate(sta);
372 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
Bob Copelanda69bd8e2015-07-14 08:31:58 -0400373 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
Bob Copelandfa87a652015-07-14 08:31:57 -0400374 sta->sta.addr, sta->mesh->llid, sta->mesh->plid,
375 sta->mesh->reason);
376 spin_unlock_bh(&sta->mesh->plink_lock);
377
378 return changed;
379}
380
Thomas Pedersen296fcba2013-01-23 12:18:12 -0800381static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
382 struct sta_info *sta,
383 struct ieee802_11_elems *elems, bool insert)
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100384{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200385 struct ieee80211_local *local = sdata->local;
Johannes Berg55de9082012-07-26 17:24:39 +0200386 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700387 struct ieee80211_supported_band *sband;
Thomas Pedersenf68d7762013-01-23 12:18:13 -0800388 u32 rates, basic_rates = 0, changed = 0;
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +0100389 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100390
Thomas Pedersenf743ff42012-04-18 19:23:43 -0700391 sband = local->hw.wiphy->bands[band];
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200392 rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates);
Johannes Bergd0709a62008-02-25 16:27:46 +0100393
Johannes Berg433f5bc2015-06-17 10:31:00 +0200394 spin_lock_bh(&sta->mesh->plink_lock);
Johannes Berge5a9f8d2015-10-16 17:54:47 +0200395 sta->rx_stats.last_rx = jiffies;
Thomas Pedersen296fcba2013-01-23 12:18:12 -0800396
397 /* rates and capabilities don't change during peering */
Johannes Berg433f5bc2015-06-17 10:31:00 +0200398 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
399 sta->mesh->processed_beacon)
Thomas Pedersen296fcba2013-01-23 12:18:12 -0800400 goto out;
Johannes Berg433f5bc2015-06-17 10:31:00 +0200401 sta->mesh->processed_beacon = true;
Chun-Yeow Yeohbae35d92012-07-24 11:52:35 +0800402
Thomas Pedersenf68d7762013-01-23 12:18:13 -0800403 if (sta->sta.supp_rates[band] != rates)
404 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
Thomas Pedersenf743ff42012-04-18 19:23:43 -0700405 sta->sta.supp_rates[band] = rates;
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700406
Thomas Pedersen52ac8c42013-02-16 10:41:04 -0800407 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
408 elems->ht_cap_elem, sta))
409 changed |= IEEE80211_RC_BW_CHANGED;
Johannes Berg4bf88532012-11-09 11:39:59 +0100410
Bob Copelandc85fb532015-08-27 09:00:18 -0400411 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
412 elems->vht_cap_elem, sta);
413
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +0100414 if (bw != sta->sta.bandwidth)
415 changed |= IEEE80211_RC_BW_CHANGED;
416
Thomas Pedersen52ac8c42013-02-16 10:41:04 -0800417 /* HT peer is operating 20MHz-only */
418 if (elems->ht_operation &&
419 !(elems->ht_operation->ht_param &
420 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
421 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
Thomas Pedersenf68d7762013-01-23 12:18:13 -0800422 changed |= IEEE80211_RC_BW_CHANGED;
Thomas Pedersen52ac8c42013-02-16 10:41:04 -0800423 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700424 }
Thomas Pedersenc7d25822012-04-26 15:01:07 -0700425
Helmut Schaa59cf1d62012-11-27 18:03:13 +0100426 if (insert)
427 rate_control_rate_init(sta);
Thomas Pedersenf68d7762013-01-23 12:18:13 -0800428 else
429 rate_control_rate_update(local, sband, sta, changed);
Thomas Pedersen296fcba2013-01-23 12:18:12 -0800430out:
Johannes Berg433f5bc2015-06-17 10:31:00 +0200431 spin_unlock_bh(&sta->mesh->plink_lock);
Thomas Pedersen296fcba2013-01-23 12:18:12 -0800432}
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700433
Bob Copeland0e0060f2015-07-14 08:31:59 -0400434static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
435{
436 struct sta_info *sta;
437 unsigned long *aid_map;
438 int aid;
439
440 aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
441 sizeof(*aid_map), GFP_KERNEL);
442 if (!aid_map)
443 return -ENOMEM;
444
445 /* reserve aid 0 for mcast indication */
446 __set_bit(0, aid_map);
447
448 rcu_read_lock();
449 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
450 __set_bit(sta->sta.aid, aid_map);
451 rcu_read_unlock();
452
453 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
454 kfree(aid_map);
455
456 if (aid > IEEE80211_MAX_AID)
457 return -ENOBUFS;
458
459 return aid;
460}
461
Thomas Pedersen296fcba2013-01-23 12:18:12 -0800462static struct sta_info *
463__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
464{
465 struct sta_info *sta;
Bob Copeland0e0060f2015-07-14 08:31:59 -0400466 int aid;
Thomas Pedersen296fcba2013-01-23 12:18:12 -0800467
468 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
Thomas Pedersene87278e2012-04-26 15:01:06 -0700469 return NULL;
470
Bob Copeland0e0060f2015-07-14 08:31:59 -0400471 aid = mesh_allocate_aid(sdata);
472 if (aid < 0)
473 return NULL;
474
Thomas Pedersen296fcba2013-01-23 12:18:12 -0800475 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
476 if (!sta)
477 return NULL;
478
Johannes Berg433f5bc2015-06-17 10:31:00 +0200479 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
Johannes Berga74a8c82014-07-22 14:50:47 +0200480 sta->sta.wme = true;
Bob Copeland0e0060f2015-07-14 08:31:59 -0400481 sta->sta.aid = aid;
Thomas Pedersen296fcba2013-01-23 12:18:12 -0800482
483 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
484 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
485 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
486
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700487 return sta;
488}
489
Thomas Pedersen296fcba2013-01-23 12:18:12 -0800490static struct sta_info *
491mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
492 struct ieee802_11_elems *elems)
493{
494 struct sta_info *sta = NULL;
495
Thomas Pedersena6dad6a2013-03-04 13:06:12 -0800496 /* Userspace handles station allocation */
497 if (sdata->u.mesh.user_mpm ||
498 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
Thomas Pedersen296fcba2013-01-23 12:18:12 -0800499 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
500 elems->ie_start,
501 elems->total_len,
502 GFP_KERNEL);
503 else
504 sta = __mesh_sta_info_alloc(sdata, addr);
505
506 return sta;
507}
508
509/*
510 * mesh_sta_info_get - return mesh sta info entry for @addr.
511 *
512 * @sdata: local meshif
513 * @addr: peer's address
514 * @elems: IEs from beacon or mesh peering frame.
515 *
516 * Return existing or newly allocated sta_info under RCU read lock.
517 * (re)initialize with given IEs.
518 */
519static struct sta_info *
520mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
521 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
522{
523 struct sta_info *sta = NULL;
524
525 rcu_read_lock();
526 sta = sta_info_get(sdata, addr);
527 if (sta) {
528 mesh_sta_info_init(sdata, sta, elems, false);
529 } else {
530 rcu_read_unlock();
531 /* can't run atomic */
532 sta = mesh_sta_info_alloc(sdata, addr, elems);
533 if (!sta) {
534 rcu_read_lock();
535 return NULL;
536 }
537
Thomas Pedersen3b4797b2013-01-26 17:00:02 -0800538 mesh_sta_info_init(sdata, sta, elems, true);
539
Thomas Pedersen296fcba2013-01-23 12:18:12 -0800540 if (sta_info_insert_rcu(sta))
541 return NULL;
542 }
543
544 return sta;
545}
546
547/*
548 * mesh_neighbour_update - update or initialize new mesh neighbor.
549 *
550 * @sdata: local meshif
551 * @addr: peer's address
552 * @elems: IEs from beacon or mesh peering frame
553 *
554 * Initiates peering if appropriate.
555 */
Thomas Pedersenf743ff42012-04-18 19:23:43 -0700556void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
557 u8 *hw_addr,
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700558 struct ieee802_11_elems *elems)
559{
560 struct sta_info *sta;
Thomas Pedersen39886b62013-02-13 12:14:19 -0800561 u32 changed = 0;
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700562
Thomas Pedersen296fcba2013-01-23 12:18:12 -0800563 sta = mesh_sta_info_get(sdata, hw_addr, elems);
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700564 if (!sta)
565 goto out;
566
Javier Cardona1570ca52011-04-07 15:08:35 -0700567 if (mesh_peer_accepts_plinks(elems) &&
Johannes Berg433f5bc2015-06-17 10:31:00 +0200568 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700569 sdata->u.mesh.accepting_plinks &&
570 sdata->u.mesh.mshcfg.auto_open_plinks &&
Bob Copeland36c9bb22013-11-05 11:16:54 -0800571 rssi_threshold_check(sdata, sta))
Thomas Pedersen39886b62013-02-13 12:14:19 -0800572 changed = mesh_plink_open(sta);
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100573
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100574 ieee80211_mps_frame_release(sta, elems);
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700575out:
Johannes Bergd0709a62008-02-25 16:27:46 +0100576 rcu_read_unlock();
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800577 ieee80211_mbss_info_change_notify(sdata, changed);
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100578}
579
580static void mesh_plink_timer(unsigned long data)
581{
582 struct sta_info *sta;
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800583 u16 reason = 0;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100584 struct ieee80211_sub_if_data *sdata;
Marco Porsch453e66f22012-11-21 18:40:32 -0800585 struct mesh_config *mshcfg;
Thomas Pedersen4efec452013-11-05 11:16:50 -0800586 enum ieee80211_self_protected_actioncode action = 0;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100587
Johannes Bergd0709a62008-02-25 16:27:46 +0100588 /*
589 * This STA is valid because sta_info_destroy() will
590 * del_timer_sync() this timer after having made sure
591 * it cannot be readded (by deleting the plink.)
592 */
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100593 sta = (struct sta_info *) data;
594
Stanislaw Gruszka690205f2013-02-28 10:55:29 +0100595 if (sta->sdata->local->quiescing)
Johannes Berg5bb644a2009-05-17 11:40:42 +0200596 return;
Johannes Berg5bb644a2009-05-17 11:40:42 +0200597
Johannes Berg433f5bc2015-06-17 10:31:00 +0200598 spin_lock_bh(&sta->mesh->plink_lock);
Bob Copeland2b470c32014-06-04 09:27:31 -0400599
600 /* If a timer fires just before a state transition on another CPU,
601 * we may have already extended the timeout and changed state by the
602 * time we've acquired the lock and arrived here. In that case,
603 * skip this timer and wait for the new one.
604 */
Johannes Berg433f5bc2015-06-17 10:31:00 +0200605 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
Bob Copeland2b470c32014-06-04 09:27:31 -0400606 mpl_dbg(sta->sdata,
607 "Ignoring timer for %pM in state %s (timer adjusted)",
Johannes Berg433f5bc2015-06-17 10:31:00 +0200608 sta->sta.addr, mplstates[sta->mesh->plink_state]);
609 spin_unlock_bh(&sta->mesh->plink_lock);
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100610 return;
611 }
Bob Copeland2b470c32014-06-04 09:27:31 -0400612
613 /* del_timer() and handler may race when entering these states */
Johannes Berg433f5bc2015-06-17 10:31:00 +0200614 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
615 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
Bob Copeland2b470c32014-06-04 09:27:31 -0400616 mpl_dbg(sta->sdata,
617 "Ignoring timer for %pM in state %s (timer deleted)",
Johannes Berg433f5bc2015-06-17 10:31:00 +0200618 sta->sta.addr, mplstates[sta->mesh->plink_state]);
619 spin_unlock_bh(&sta->mesh->plink_lock);
Bob Copeland2b470c32014-06-04 09:27:31 -0400620 return;
621 }
622
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200623 mpl_dbg(sta->sdata,
Thomas Pedersen3088f7d2013-04-08 11:06:16 -0700624 "Mesh plink timer for %pM fired on state %s\n",
Johannes Berg433f5bc2015-06-17 10:31:00 +0200625 sta->sta.addr, mplstates[sta->mesh->plink_state]);
Johannes Bergd0709a62008-02-25 16:27:46 +0100626 sdata = sta->sdata;
Marco Porsch453e66f22012-11-21 18:40:32 -0800627 mshcfg = &sdata->u.mesh.mshcfg;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100628
Johannes Berg433f5bc2015-06-17 10:31:00 +0200629 switch (sta->mesh->plink_state) {
Javier Cardona57cf8042011-05-13 10:45:43 -0700630 case NL80211_PLINK_OPN_RCVD:
631 case NL80211_PLINK_OPN_SNT:
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100632 /* retry timer */
Johannes Berg433f5bc2015-06-17 10:31:00 +0200633 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100634 u32 rand;
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200635 mpl_dbg(sta->sdata,
636 "Mesh plink for %pM (retry, timeout): %d %d\n",
Johannes Berg433f5bc2015-06-17 10:31:00 +0200637 sta->sta.addr, sta->mesh->plink_retries,
638 sta->mesh->plink_timeout);
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100639 get_random_bytes(&rand, sizeof(u32));
Johannes Berg433f5bc2015-06-17 10:31:00 +0200640 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
641 rand % sta->mesh->plink_timeout;
642 ++sta->mesh->plink_retries;
643 mod_plink_timer(sta, sta->mesh->plink_timeout);
Thomas Pedersen4efec452013-11-05 11:16:50 -0800644 action = WLAN_SP_MESH_PEERING_OPEN;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100645 break;
646 }
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800647 reason = WLAN_REASON_MESH_MAX_RETRIES;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100648 /* fall through on else */
Javier Cardona57cf8042011-05-13 10:45:43 -0700649 case NL80211_PLINK_CNF_RCVD:
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100650 /* confirm timer */
651 if (!reason)
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800652 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
Johannes Berg433f5bc2015-06-17 10:31:00 +0200653 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
Marco Porsch453e66f22012-11-21 18:40:32 -0800654 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
Thomas Pedersen4efec452013-11-05 11:16:50 -0800655 action = WLAN_SP_MESH_PEERING_CLOSE;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100656 break;
Javier Cardona57cf8042011-05-13 10:45:43 -0700657 case NL80211_PLINK_HOLDING:
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100658 /* holding timer */
Johannes Berg433f5bc2015-06-17 10:31:00 +0200659 del_timer(&sta->mesh->plink_timer);
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100660 mesh_plink_fsm_restart(sta);
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100661 break;
662 default:
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100663 break;
664 }
Johannes Berg433f5bc2015-06-17 10:31:00 +0200665 spin_unlock_bh(&sta->mesh->plink_lock);
Thomas Pedersen4efec452013-11-05 11:16:50 -0800666 if (action)
Bob Copelanda69bd8e2015-07-14 08:31:58 -0400667 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
Johannes Berg433f5bc2015-06-17 10:31:00 +0200668 sta->mesh->llid, sta->mesh->plid, reason);
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100669}
670
Nicholas Mc Guire0df2f6c2015-03-02 04:54:14 -0500671static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100672{
Johannes Berg433f5bc2015-06-17 10:31:00 +0200673 sta->mesh->plink_timer.expires = jiffies + msecs_to_jiffies(timeout);
674 sta->mesh->plink_timer.data = (unsigned long) sta;
675 sta->mesh->plink_timer.function = mesh_plink_timer;
676 sta->mesh->plink_timeout = timeout;
677 add_timer(&sta->mesh->plink_timer);
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100678}
679
Thomas Pedersen204d1302013-11-05 11:17:05 -0800680static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800681 u16 llid)
Thomas Pedersen204d1302013-11-05 11:17:05 -0800682{
683 struct ieee80211_local *local = sdata->local;
684 bool in_use = false;
685 struct sta_info *sta;
686
687 rcu_read_lock();
688 list_for_each_entry_rcu(sta, &local->sta_list, list) {
Matthias Schiffer520c75d2015-10-24 21:25:51 +0200689 if (sdata != sta->sdata)
690 continue;
691
Johannes Berg433f5bc2015-06-17 10:31:00 +0200692 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
Thomas Pedersen204d1302013-11-05 11:17:05 -0800693 in_use = true;
694 break;
695 }
696 }
697 rcu_read_unlock();
698
699 return in_use;
700}
701
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800702static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
Thomas Pedersen204d1302013-11-05 11:17:05 -0800703{
704 u16 llid;
705
706 do {
707 get_random_bytes(&llid, sizeof(llid));
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800708 } while (llid_in_use(sdata, llid));
Thomas Pedersen204d1302013-11-05 11:17:05 -0800709
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800710 return llid;
Thomas Pedersen204d1302013-11-05 11:17:05 -0800711}
712
Thomas Pedersen39886b62013-02-13 12:14:19 -0800713u32 mesh_plink_open(struct sta_info *sta)
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100714{
Johannes Bergd0709a62008-02-25 16:27:46 +0100715 struct ieee80211_sub_if_data *sdata = sta->sdata;
Thomas Pedersen39886b62013-02-13 12:14:19 -0800716 u32 changed;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100717
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200718 if (!test_sta_flag(sta, WLAN_STA_AUTH))
Thomas Pedersen39886b62013-02-13 12:14:19 -0800719 return 0;
Javier Cardona53e80512011-04-07 15:08:32 -0700720
Johannes Berg433f5bc2015-06-17 10:31:00 +0200721 spin_lock_bh(&sta->mesh->plink_lock);
722 sta->mesh->llid = mesh_get_new_llid(sdata);
723 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
724 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
725 spin_unlock_bh(&sta->mesh->plink_lock);
Thomas Pedersen39886b62013-02-13 12:14:19 -0800726 return 0;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100727 }
Johannes Berg433f5bc2015-06-17 10:31:00 +0200728 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
Marco Porsch453e66f22012-11-21 18:40:32 -0800729 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
Johannes Berg433f5bc2015-06-17 10:31:00 +0200730 spin_unlock_bh(&sta->mesh->plink_lock);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200731 mpl_dbg(sdata,
732 "Mesh plink: starting establishment with %pM\n",
Johannes Berg0c68ae262008-10-27 15:56:10 -0700733 sta->sta.addr);
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100734
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100735 /* set the non-peer mode to active during peering */
Thomas Pedersen39886b62013-02-13 12:14:19 -0800736 changed = ieee80211_mps_local_status_update(sdata);
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100737
Bob Copelanda69bd8e2015-07-14 08:31:58 -0400738 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
Johannes Berg433f5bc2015-06-17 10:31:00 +0200739 sta->sta.addr, sta->mesh->llid, 0, 0);
Thomas Pedersen39886b62013-02-13 12:14:19 -0800740 return changed;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100741}
742
Thomas Pedersen39886b62013-02-13 12:14:19 -0800743u32 mesh_plink_block(struct sta_info *sta)
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100744{
Marco Porschdf323812012-08-08 07:58:43 +0200745 u32 changed;
John W. Linvillec9370192010-06-21 17:14:07 -0400746
Johannes Berg433f5bc2015-06-17 10:31:00 +0200747 spin_lock_bh(&sta->mesh->plink_lock);
Marco Porschdf323812012-08-08 07:58:43 +0200748 changed = __mesh_plink_deactivate(sta);
Johannes Berg433f5bc2015-06-17 10:31:00 +0200749 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
750 spin_unlock_bh(&sta->mesh->plink_lock);
John W. Linvillec9370192010-06-21 17:14:07 -0400751
Thomas Pedersen39886b62013-02-13 12:14:19 -0800752 return changed;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +0100753}
754
Bob Copelande76d67f2013-11-05 11:16:52 -0800755static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
756 struct sta_info *sta,
757 enum plink_event event)
758{
759 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800760 u16 reason = (event == CLS_ACPT) ?
761 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
Bob Copelande76d67f2013-11-05 11:16:52 -0800762
Johannes Berg433f5bc2015-06-17 10:31:00 +0200763 sta->mesh->reason = reason;
764 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
Bob Copeland272a9e22013-11-05 11:16:56 -0800765 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
Bob Copelande76d67f2013-11-05 11:16:52 -0800766}
767
768static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
769 struct sta_info *sta)
770{
771 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
772 u32 changed = 0;
773
Johannes Berg433f5bc2015-06-17 10:31:00 +0200774 del_timer(&sta->mesh->plink_timer);
775 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
Bob Copelande76d67f2013-11-05 11:16:52 -0800776 changed |= mesh_plink_inc_estab_count(sdata);
777 changed |= mesh_set_ht_prot_mode(sdata);
778 changed |= mesh_set_short_slot_time(sdata);
779 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
780 ieee80211_mps_sta_status_update(sta);
781 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
782 return changed;
783}
784
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800785/**
786 * mesh_plink_fsm - step @sta MPM based on @event
787 *
788 * @sdata: interface
789 * @sta: mesh neighbor
790 * @event: peering event
791 *
792 * Return: changed MBSS flags
793 */
794static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
795 struct sta_info *sta, enum plink_event event)
796{
797 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
798 enum ieee80211_self_protected_actioncode action = 0;
799 u32 changed = 0;
800
801 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
Johannes Berg433f5bc2015-06-17 10:31:00 +0200802 mplstates[sta->mesh->plink_state], mplevents[event]);
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800803
Johannes Berg433f5bc2015-06-17 10:31:00 +0200804 spin_lock_bh(&sta->mesh->plink_lock);
805 switch (sta->mesh->plink_state) {
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800806 case NL80211_PLINK_LISTEN:
807 switch (event) {
808 case CLS_ACPT:
809 mesh_plink_fsm_restart(sta);
810 break;
811 case OPN_ACPT:
Johannes Berg433f5bc2015-06-17 10:31:00 +0200812 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
813 sta->mesh->llid = mesh_get_new_llid(sdata);
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800814 mesh_plink_timer_set(sta,
815 mshcfg->dot11MeshRetryTimeout);
816
817 /* set the non-peer mode to active during peering */
818 changed |= ieee80211_mps_local_status_update(sdata);
819 action = WLAN_SP_MESH_PEERING_OPEN;
820 break;
821 default:
822 break;
823 }
824 break;
825 case NL80211_PLINK_OPN_SNT:
826 switch (event) {
827 case OPN_RJCT:
828 case CNF_RJCT:
829 case CLS_ACPT:
830 mesh_plink_close(sdata, sta, event);
831 action = WLAN_SP_MESH_PEERING_CLOSE;
832 break;
833 case OPN_ACPT:
834 /* retry timer is left untouched */
Johannes Berg433f5bc2015-06-17 10:31:00 +0200835 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800836 action = WLAN_SP_MESH_PEERING_CONFIRM;
837 break;
838 case CNF_ACPT:
Johannes Berg433f5bc2015-06-17 10:31:00 +0200839 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
Bob Copeland2b470c32014-06-04 09:27:31 -0400840 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800841 break;
842 default:
843 break;
844 }
845 break;
846 case NL80211_PLINK_OPN_RCVD:
847 switch (event) {
848 case OPN_RJCT:
849 case CNF_RJCT:
850 case CLS_ACPT:
851 mesh_plink_close(sdata, sta, event);
852 action = WLAN_SP_MESH_PEERING_CLOSE;
853 break;
854 case OPN_ACPT:
855 action = WLAN_SP_MESH_PEERING_CONFIRM;
856 break;
857 case CNF_ACPT:
858 changed |= mesh_plink_establish(sdata, sta);
859 break;
860 default:
861 break;
862 }
863 break;
864 case NL80211_PLINK_CNF_RCVD:
865 switch (event) {
866 case OPN_RJCT:
867 case CNF_RJCT:
868 case CLS_ACPT:
869 mesh_plink_close(sdata, sta, event);
870 action = WLAN_SP_MESH_PEERING_CLOSE;
871 break;
872 case OPN_ACPT:
873 changed |= mesh_plink_establish(sdata, sta);
874 action = WLAN_SP_MESH_PEERING_CONFIRM;
875 break;
876 default:
877 break;
878 }
879 break;
880 case NL80211_PLINK_ESTAB:
881 switch (event) {
882 case CLS_ACPT:
883 changed |= __mesh_plink_deactivate(sta);
884 changed |= mesh_set_ht_prot_mode(sdata);
885 changed |= mesh_set_short_slot_time(sdata);
886 mesh_plink_close(sdata, sta, event);
887 action = WLAN_SP_MESH_PEERING_CLOSE;
888 break;
889 case OPN_ACPT:
890 action = WLAN_SP_MESH_PEERING_CONFIRM;
891 break;
892 default:
893 break;
894 }
895 break;
896 case NL80211_PLINK_HOLDING:
897 switch (event) {
898 case CLS_ACPT:
Johannes Berg433f5bc2015-06-17 10:31:00 +0200899 del_timer(&sta->mesh->plink_timer);
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800900 mesh_plink_fsm_restart(sta);
901 break;
902 case OPN_ACPT:
903 case CNF_ACPT:
904 case OPN_RJCT:
905 case CNF_RJCT:
906 action = WLAN_SP_MESH_PEERING_CLOSE;
907 break;
908 default:
909 break;
910 }
911 break;
912 default:
913 /* should not get here, PLINK_BLOCKED is dealt with at the
914 * beginning of the function
915 */
916 break;
917 }
Johannes Berg433f5bc2015-06-17 10:31:00 +0200918 spin_unlock_bh(&sta->mesh->plink_lock);
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800919 if (action) {
Bob Copelanda69bd8e2015-07-14 08:31:58 -0400920 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
Johannes Berg433f5bc2015-06-17 10:31:00 +0200921 sta->mesh->llid, sta->mesh->plid,
922 sta->mesh->reason);
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800923
924 /* also send confirm in open case */
925 if (action == WLAN_SP_MESH_PEERING_OPEN) {
Bob Copelanda69bd8e2015-07-14 08:31:58 -0400926 mesh_plink_frame_tx(sdata, sta,
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800927 WLAN_SP_MESH_PEERING_CONFIRM,
Johannes Berg433f5bc2015-06-17 10:31:00 +0200928 sta->sta.addr, sta->mesh->llid,
929 sta->mesh->plid, 0);
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800930 }
931 }
932
933 return changed;
934}
935
Thomas Pedersenc99a89e2013-11-05 11:17:03 -0800936/*
937 * mesh_plink_get_event - get correct MPM event
938 *
939 * @sdata: interface
940 * @sta: peer, leave NULL if processing a frame from a new suitable peer
941 * @elems: peering management IEs
942 * @ftype: frame type
943 * @llid: peer's peer link ID
944 * @plid: peer's local link ID
945 *
946 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
947 * an error.
948 */
949static enum plink_event
950mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
951 struct sta_info *sta,
952 struct ieee802_11_elems *elems,
953 enum ieee80211_self_protected_actioncode ftype,
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800954 u16 llid, u16 plid)
Thomas Pedersenc99a89e2013-11-05 11:17:03 -0800955{
956 enum plink_event event = PLINK_UNDEFINED;
957 u8 ie_len = elems->peering_len;
958 bool matches_local;
959
960 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
961 mesh_matches_local(sdata, elems));
962
963 /* deny open request from non-matching peer */
964 if (!matches_local && !sta) {
965 event = OPN_RJCT;
966 goto out;
967 }
968
969 if (!sta) {
970 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
971 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
972 goto out;
973 }
974 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
975 if (!mesh_plink_free_count(sdata)) {
976 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
977 goto out;
978 }
979 } else {
980 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
981 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
982 goto out;
983 }
Johannes Berg433f5bc2015-06-17 10:31:00 +0200984 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
Thomas Pedersenc99a89e2013-11-05 11:17:03 -0800985 goto out;
986 }
987
988 /* new matching peer */
989 if (!sta) {
990 event = OPN_ACPT;
991 goto out;
992 }
993
994 switch (ftype) {
995 case WLAN_SP_MESH_PEERING_OPEN:
996 if (!matches_local)
997 event = OPN_RJCT;
998 if (!mesh_plink_free_count(sdata) ||
Johannes Berg433f5bc2015-06-17 10:31:00 +0200999 (sta->mesh->plid && sta->mesh->plid != plid))
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001000 event = OPN_IGNR;
1001 else
1002 event = OPN_ACPT;
1003 break;
1004 case WLAN_SP_MESH_PEERING_CONFIRM:
1005 if (!matches_local)
1006 event = CNF_RJCT;
1007 if (!mesh_plink_free_count(sdata) ||
Johannes Berg433f5bc2015-06-17 10:31:00 +02001008 sta->mesh->llid != llid ||
1009 (sta->mesh->plid && sta->mesh->plid != plid))
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001010 event = CNF_IGNR;
1011 else
1012 event = CNF_ACPT;
1013 break;
1014 case WLAN_SP_MESH_PEERING_CLOSE:
Johannes Berg433f5bc2015-06-17 10:31:00 +02001015 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001016 /* Do not check for llid or plid. This does not
1017 * follow the standard but since multiple plinks
1018 * per sta are not supported, it is necessary in
1019 * order to avoid a livelock when MP A sees an
1020 * establish peer link to MP B but MP B does not
1021 * see it. This can be caused by a timeout in
1022 * B's peer link establishment or B beign
1023 * restarted.
1024 */
1025 event = CLS_ACPT;
Johannes Berg433f5bc2015-06-17 10:31:00 +02001026 else if (sta->mesh->plid != plid)
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001027 event = CLS_IGNR;
Johannes Berg433f5bc2015-06-17 10:31:00 +02001028 else if (ie_len == 8 && sta->mesh->llid != llid)
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001029 event = CLS_IGNR;
1030 else
1031 event = CLS_ACPT;
1032 break;
1033 default:
1034 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1035 break;
1036 }
1037
1038out:
1039 return event;
1040}
1041
Thomas Pedersen05a23ae2013-11-05 11:16:59 -08001042static void
1043mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1044 struct ieee80211_mgmt *mgmt,
1045 struct ieee802_11_elems *elems)
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +01001046{
Thomas Pedersen05a23ae2013-11-05 11:16:59 -08001047
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +01001048 struct sta_info *sta;
1049 enum plink_event event;
Thomas Pedersen54ef6562011-08-11 19:35:12 -07001050 enum ieee80211_self_protected_actioncode ftype;
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -07001051 u32 changed = 0;
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001052 u8 ie_len = elems->peering_len;
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +08001053 u16 plid, llid = 0;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +01001054
Thomas Pedersen05a23ae2013-11-05 11:16:59 -08001055 if (!elems->peering) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001056 mpl_dbg(sdata,
1057 "Mesh plink: missing necessary peer link ie\n");
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +01001058 return;
1059 }
Johannes Bergbf7cd942013-02-15 14:40:31 +01001060
Thomas Pedersen05a23ae2013-11-05 11:16:59 -08001061 if (elems->rsn_len &&
Johannes Bergbf7cd942013-02-15 14:40:31 +01001062 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001063 mpl_dbg(sdata,
1064 "Mesh plink: can't establish link with secure peer\n");
Javier Cardona5cff5e02011-04-07 15:08:29 -07001065 return;
1066 }
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +01001067
Thomas Pedersen8db09852011-08-12 20:01:00 -07001068 ftype = mgmt->u.action.u.self_prot.action_code;
Thomas Pedersen8db09852011-08-12 20:01:00 -07001069 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1070 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1071 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1072 && ie_len != 8)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001073 mpl_dbg(sdata,
1074 "Mesh plink: incorrect plink ie length %d %d\n",
1075 ftype, ie_len);
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +01001076 return;
1077 }
1078
Thomas Pedersen54ef6562011-08-11 19:35:12 -07001079 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
Thomas Pedersen05a23ae2013-11-05 11:16:59 -08001080 (!elems->mesh_id || !elems->mesh_config)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001081 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +01001082 return;
1083 }
1084 /* Note the lines below are correct, the llid in the frame is the plid
1085 * from the point of view of this host.
1086 */
Bob Copelandf8134fe2014-06-28 16:35:26 -04001087 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
Thomas Pedersen54ef6562011-08-11 19:35:12 -07001088 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
Bob Copelandf8134fe2014-06-28 16:35:26 -04001089 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1090 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +01001091
Thomas Pedersen296fcba2013-01-23 12:18:12 -08001092 /* WARNING: Only for sta pointer, is dropped & re-acquired */
Johannes Bergd0709a62008-02-25 16:27:46 +01001093 rcu_read_lock();
1094
Johannes Bergabe60632009-11-25 17:46:18 +01001095 sta = sta_info_get(sdata, mgmt->sa);
Bob Copeland32cb05b2013-11-05 11:16:53 -08001096
Ashok Nagarajan55335132012-02-28 17:04:08 -08001097 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
Bob Copeland36c9bb22013-11-05 11:16:54 -08001098 !rssi_threshold_check(sdata, sta)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001099 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
Ashok Nagarajan3d4f9692012-03-06 12:48:30 -08001100 mgmt->sa);
Thomas Pedersenfc103022013-11-05 11:17:00 -08001101 goto unlock_rcu;
Ashok Nagarajan55335132012-02-28 17:04:08 -08001102 }
1103
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +01001104 /* Now we will figure out the appropriate event... */
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001105 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -07001106
1107 if (event == OPN_ACPT) {
Thomas Pedersen296fcba2013-01-23 12:18:12 -08001108 rcu_read_unlock();
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -07001109 /* allocate sta entry if necessary and update info */
Thomas Pedersen05a23ae2013-11-05 11:16:59 -08001110 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -07001111 if (!sta) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001112 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
Thomas Pedersenfc103022013-11-05 11:17:00 -08001113 goto unlock_rcu;
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -07001114 }
Johannes Berg433f5bc2015-06-17 10:31:00 +02001115 sta->mesh->plid = plid;
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001116 } else if (!sta && event == OPN_RJCT) {
Bob Copelanda69bd8e2015-07-14 08:31:58 -04001117 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001118 mgmt->sa, 0, plid,
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +08001119 WLAN_REASON_MESH_CONFIG);
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001120 goto unlock_rcu;
1121 } else if (!sta || event == PLINK_UNDEFINED) {
1122 /* something went wrong */
1123 goto unlock_rcu;
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +01001124 }
1125
Bob Copelanda69bd8e2015-07-14 08:31:58 -04001126 if (event == CNF_ACPT) {
1127 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
Bob Copeland0e0060f2015-07-14 08:31:59 -04001128 if (!sta->mesh->plid)
Bob Copelanda69bd8e2015-07-14 08:31:58 -04001129 sta->mesh->plid = plid;
Bob Copelanda69bd8e2015-07-14 08:31:58 -04001130
1131 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1132 }
Bob Copeland6c6fa492014-06-28 16:35:25 -04001133
Thomas Pedersenc7e67812013-11-05 11:17:02 -08001134 changed |= mesh_plink_fsm(sdata, sta, event);
Johannes Bergd0709a62008-02-25 16:27:46 +01001135
Thomas Pedersenfc103022013-11-05 11:17:00 -08001136unlock_rcu:
Johannes Bergd0709a62008-02-25 16:27:46 +01001137 rcu_read_unlock();
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -07001138
Thomas Pedersenecccd072013-06-10 13:17:21 -07001139 if (changed)
Thomas Pedersen2b5e1962013-02-14 11:20:13 -08001140 ieee80211_mbss_info_change_notify(sdata, changed);
Luis Carlos Coboc3896d2c2008-02-23 15:17:13 +01001141}
Thomas Pedersen05a23ae2013-11-05 11:16:59 -08001142
1143void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1144 struct ieee80211_mgmt *mgmt, size_t len,
1145 struct ieee80211_rx_status *rx_status)
1146{
1147 struct ieee802_11_elems elems;
1148 size_t baselen;
1149 u8 *baseaddr;
1150
1151 /* need action_code, aux */
1152 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1153 return;
1154
1155 if (sdata->u.mesh.user_mpm)
1156 /* userspace must register for these */
1157 return;
1158
1159 if (is_multicast_ether_addr(mgmt->da)) {
1160 mpl_dbg(sdata,
1161 "Mesh plink: ignore frame from multicast address\n");
1162 return;
1163 }
1164
1165 baseaddr = mgmt->u.action.u.self_prot.variable;
1166 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1167 if (mgmt->u.action.u.self_prot.action_code ==
1168 WLAN_SP_MESH_PEERING_CONFIRM) {
1169 baseaddr += 4;
1170 baselen += 4;
Bob Copelandb3e7de82015-07-14 08:31:56 -04001171
1172 if (baselen > len)
1173 return;
Thomas Pedersen05a23ae2013-11-05 11:16:59 -08001174 }
1175 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1176 mesh_process_plink_frame(sdata, mgmt, &elems);
1177}