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Luis Carlos Coboc3896d22008-02-23 15:17:13 +01001/*
Rui Paulo264d9b72009-11-09 23:46:58 +00002 * Copyright (c) 2008, 2009 open80211s Ltd.
Luis Carlos Coboc3896d22008-02-23 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>
Ingo Molnarb2d09102017-02-04 01:27:20 +010012#include <linux/rculist.h>
13
Luis Carlos Coboc3896d22008-02-23 15:17:13 +010014#include "ieee80211_i.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040015#include "rate.h"
Luis Carlos Coboc3896d22008-02-23 15:17:13 +010016#include "mesh.h"
Luis Carlos Coboc3896d22008-02-23 15:17:13 +010017
Bob Copelanda69bd8e2015-07-14 08:31:58 -040018#define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2)
Thomas Pedersen8db09852011-08-12 20:01:00 -070019#define PLINK_GET_LLID(p) (p + 2)
20#define PLINK_GET_PLID(p) (p + 4)
Luis Carlos Coboc3896d22008-02-23 15:17:13 +010021
Johannes Berg433f5bc2015-06-17 10:31:00 +020022#define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \
Nicholas Mc Guirecc57ac52015-03-02 04:54:13 -050023 jiffies + msecs_to_jiffies(t)))
Luis Carlos Coboc3896d22008-02-23 15:17:13 +010024
Luis Carlos Coboc3896d22008-02-23 15:17:13 +010025enum plink_event {
26 PLINK_UNDEFINED,
27 OPN_ACPT,
28 OPN_RJCT,
29 OPN_IGNR,
30 CNF_ACPT,
31 CNF_RJCT,
32 CNF_IGNR,
33 CLS_ACPT,
34 CLS_IGNR
35};
36
Thomas Pedersen95e48ad2013-02-16 10:41:05 -080037static const char * const mplstates[] = {
38 [NL80211_PLINK_LISTEN] = "LISTEN",
39 [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
40 [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
41 [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
42 [NL80211_PLINK_ESTAB] = "ESTAB",
43 [NL80211_PLINK_HOLDING] = "HOLDING",
44 [NL80211_PLINK_BLOCKED] = "BLOCKED"
45};
46
47static const char * const mplevents[] = {
48 [PLINK_UNDEFINED] = "NONE",
49 [OPN_ACPT] = "OPN_ACPT",
50 [OPN_RJCT] = "OPN_RJCT",
51 [OPN_IGNR] = "OPN_IGNR",
52 [CNF_ACPT] = "CNF_ACPT",
53 [CNF_RJCT] = "CNF_RJCT",
54 [CNF_IGNR] = "CNF_IGNR",
55 [CLS_ACPT] = "CLS_ACPT",
56 [CLS_IGNR] = "CLS_IGNR"
57};
58
Bob Copeland36c9bb22013-11-05 11:16:54 -080059/* We only need a valid sta if user configured a minimum rssi_threshold. */
60static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
61 struct sta_info *sta)
62{
63 s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
64 return rssi_threshold == 0 ||
Johannes Berge5a9f8d2015-10-16 17:54:47 +020065 (sta &&
Johannes Berg0be6ed12016-03-31 20:02:05 +030066 (s8)-ewma_signal_read(&sta->rx_stats_avg.signal) >
Johannes Berge5a9f8d2015-10-16 17:54:47 +020067 rssi_threshold);
Bob Copeland36c9bb22013-11-05 11:16:54 -080068}
69
Luis Carlos Coboc3896d22008-02-23 15:17:13 +010070/**
71 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
72 *
Rui Paulo23c7a292009-11-09 23:46:42 +000073 * @sta: mesh peer link to restart
Luis Carlos Coboc3896d22008-02-23 15:17:13 +010074 *
Johannes Berg433f5bc2015-06-17 10:31:00 +020075 * Locking: this function must be called holding sta->mesh->plink_lock
Luis Carlos Coboc3896d22008-02-23 15:17:13 +010076 */
77static inline void mesh_plink_fsm_restart(struct sta_info *sta)
78{
Johannes Berg433f5bc2015-06-17 10:31:00 +020079 lockdep_assert_held(&sta->mesh->plink_lock);
80 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
81 sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0;
82 sta->mesh->plink_retries = 0;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +010083}
84
Thomas Pedersen3b144652013-01-26 16:39:55 -080085/*
86 * mesh_set_short_slot_time - enable / disable ERP short slot time.
87 *
88 * The standard indirectly mandates mesh STAs to turn off short slot time by
89 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
90 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
91 * MBSS support ERP rates.
92 *
93 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
94 */
95static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
96{
97 struct ieee80211_local *local = sdata->local;
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +053098 struct ieee80211_supported_band *sband;
Thomas Pedersen3b144652013-01-26 16:39:55 -080099 struct sta_info *sta;
100 u32 erp_rates = 0, changed = 0;
101 int i;
102 bool short_slot = false;
103
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +0530104 sband = ieee80211_get_sband(sdata);
105 if (!sband)
106 return changed;
107
108 if (sband->band == NL80211_BAND_5GHZ) {
Thomas Pedersen3b144652013-01-26 16:39:55 -0800109 /* (IEEE 802.11-2012 19.4.5) */
110 short_slot = true;
111 goto out;
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +0530112 } else if (sband->band != NL80211_BAND_2GHZ) {
Thomas Pedersen3b144652013-01-26 16:39:55 -0800113 goto out;
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +0530114 }
Thomas Pedersen3b144652013-01-26 16:39:55 -0800115
116 for (i = 0; i < sband->n_bitrates; i++)
117 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
118 erp_rates |= BIT(i);
119
120 if (!erp_rates)
121 goto out;
122
123 rcu_read_lock();
124 list_for_each_entry_rcu(sta, &local->sta_list, list) {
125 if (sdata != sta->sdata ||
Johannes Berg433f5bc2015-06-17 10:31:00 +0200126 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
Thomas Pedersen3b144652013-01-26 16:39:55 -0800127 continue;
128
129 short_slot = false;
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +0530130 if (erp_rates & sta->sta.supp_rates[sband->band])
Thomas Pedersen3b144652013-01-26 16:39:55 -0800131 short_slot = true;
132 else
133 break;
134 }
135 rcu_read_unlock();
136
137out:
138 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
139 sdata->vif.bss_conf.use_short_slot = short_slot;
140 changed = BSS_CHANGED_ERP_SLOT;
141 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
142 sdata->vif.addr, short_slot);
143 }
144 return changed;
145}
146
Ben Hutchings2c530402012-07-10 10:55:09 +0000147/**
Ashok Nagarajancbf93222012-05-07 21:00:31 -0700148 * mesh_set_ht_prot_mode - set correct HT protection mode
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700149 *
Ashok Nagarajancbf93222012-05-07 21:00:31 -0700150 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
151 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
152 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
153 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
154 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
155 * HT20 peer is present. Otherwise no-protection mode is selected.
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700156 */
157static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
158{
159 struct ieee80211_local *local = sdata->local;
160 struct sta_info *sta;
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700161 u16 ht_opmode;
162 bool non_ht_sta = false, ht20_sta = false;
163
Simon Wunderlich0418a442013-05-16 13:00:31 +0200164 switch (sdata->vif.bss_conf.chandef.width) {
165 case NL80211_CHAN_WIDTH_20_NOHT:
166 case NL80211_CHAN_WIDTH_5:
167 case NL80211_CHAN_WIDTH_10:
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700168 return 0;
Simon Wunderlich0418a442013-05-16 13:00:31 +0200169 default:
170 break;
171 }
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700172
173 rcu_read_lock();
174 list_for_each_entry_rcu(sta, &local->sta_list, list) {
Ashok Nagarajancbf93222012-05-07 21:00:31 -0700175 if (sdata != sta->sdata ||
Johannes Berg433f5bc2015-06-17 10:31:00 +0200176 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
Ashok Nagarajancbf93222012-05-07 21:00:31 -0700177 continue;
178
Thomas Pedersen52ac8c42013-02-16 10:41:04 -0800179 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
180 continue;
181
182 if (!sta->sta.ht_cap.ht_supported) {
183 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
184 sta->sta.addr);
Ashok Nagarajancbf93222012-05-07 21:00:31 -0700185 non_ht_sta = true;
Ashok Nagarajancbf93222012-05-07 21:00:31 -0700186 break;
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700187 }
Thomas Pedersen52ac8c42013-02-16 10:41:04 -0800188
189 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
190 ht20_sta = true;
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700191 }
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700192 rcu_read_unlock();
193
194 if (non_ht_sta)
195 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
Johannes Berg466f3102012-07-25 13:51:49 +0200196 else if (ht20_sta &&
Johannes Berg4bf88532012-11-09 11:39:59 +0100197 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700198 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
199 else
200 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
201
Thomas Pedersen52ac8c42013-02-16 10:41:04 -0800202 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
203 return 0;
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700204
Thomas Pedersen52ac8c42013-02-16 10:41:04 -0800205 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
206 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
207 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
208 return BSS_CHANGED_HT;
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700209}
210
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200211static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
Bob Copelanda69bd8e2015-07-14 08:31:58 -0400212 struct sta_info *sta,
Johannes Bergbf7cd942013-02-15 14:40:31 +0100213 enum ieee80211_self_protected_actioncode action,
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800214 u8 *da, u16 llid, u16 plid, u16 reason)
Johannes Bergbf7cd942013-02-15 14:40:31 +0100215{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200216 struct ieee80211_local *local = sdata->local;
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700217 struct sk_buff *skb;
Thomas Pedersene7570df2012-08-03 12:21:34 -0700218 struct ieee80211_tx_info *info;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100219 struct ieee80211_mgmt *mgmt;
220 bool include_plid = false;
Thomas Pedersen8db09852011-08-12 20:01:00 -0700221 u16 peering_proto = 0;
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700222 u8 *pos, ie_len = 4;
223 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
224 sizeof(mgmt->u.action.u.self_prot);
Thomas Pedersenf609a432012-08-03 12:21:35 -0700225 int err = -ENOMEM;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100226
Javier Cardona65e8b0c2012-01-17 18:17:46 -0800227 skb = dev_alloc_skb(local->tx_headroom +
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700228 hdr_len +
229 2 + /* capability info */
230 2 + /* AID */
231 2 + 8 + /* supported rates */
232 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
233 2 + sdata->u.mesh.mesh_id_len +
234 2 + sizeof(struct ieee80211_meshconf_ie) +
Thomas Pedersen176f3602011-10-26 14:47:27 -0700235 2 + sizeof(struct ieee80211_ht_cap) +
Johannes Berg074d46d2012-03-15 19:45:16 +0100236 2 + sizeof(struct ieee80211_ht_operation) +
Bob Copelandc85fb532015-08-27 09:00:18 -0400237 2 + sizeof(struct ieee80211_vht_cap) +
238 2 + sizeof(struct ieee80211_vht_operation) +
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700239 2 + 8 + /* peering IE */
240 sdata->u.mesh.ie_len);
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100241 if (!skb)
Bob Copeland87d84c42013-11-05 11:16:57 -0800242 return err;
Thomas Pedersene7570df2012-08-03 12:21:34 -0700243 info = IEEE80211_SKB_CB(skb);
Javier Cardona65e8b0c2012-01-17 18:17:46 -0800244 skb_reserve(skb, local->tx_headroom);
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700245 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
246 memset(mgmt, 0, hdr_len);
Harvey Harrisone7827a72008-07-15 18:44:13 -0700247 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
248 IEEE80211_STYPE_ACTION);
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100249 memcpy(mgmt->da, da, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +0100250 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
Javier Cardona915b5c52011-05-03 16:57:10 -0700251 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
Thomas Pedersen8db09852011-08-12 20:01:00 -0700252 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
253 mgmt->u.action.u.self_prot.action_code = action;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100254
Thomas Pedersen8db09852011-08-12 20:01:00 -0700255 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +0530256 struct ieee80211_supported_band *sband;
257 enum nl80211_band band;
258
259 sband = ieee80211_get_sband(sdata);
260 if (!sband) {
261 err = -EINVAL;
262 goto free;
263 }
264 band = sband->band;
Johannes Berg55de9082012-07-26 17:24:39 +0200265
Thomas Pedersen8db09852011-08-12 20:01:00 -0700266 /* capability info */
267 pos = skb_put(skb, 2);
268 memset(pos, 0, 2);
Thomas Pedersen54ef6562011-08-11 19:35:12 -0700269 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
Thomas Pedersen8db09852011-08-12 20:01:00 -0700270 /* AID */
271 pos = skb_put(skb, 2);
Bob Copelanda69bd8e2015-07-14 08:31:58 -0400272 put_unaligned_le16(sta->sta.aid, pos);
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100273 }
Johannes Berg55de9082012-07-26 17:24:39 +0200274 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
275 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
Johannes Bergbf7cd942013-02-15 14:40:31 +0100276 mesh_add_rsn_ie(sdata, skb) ||
277 mesh_add_meshid_ie(sdata, skb) ||
278 mesh_add_meshconf_ie(sdata, skb))
Thomas Pedersenf609a432012-08-03 12:21:35 -0700279 goto free;
Thomas Pedersen8db09852011-08-12 20:01:00 -0700280 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
Thomas Pedersene7570df2012-08-03 12:21:34 -0700281 info->flags |= IEEE80211_TX_CTL_NO_ACK;
Johannes Bergbf7cd942013-02-15 14:40:31 +0100282 if (mesh_add_meshid_ie(sdata, skb))
Thomas Pedersenf609a432012-08-03 12:21:35 -0700283 goto free;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100284 }
285
Thomas Pedersen8db09852011-08-12 20:01:00 -0700286 /* Add Mesh Peering Management element */
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100287 switch (action) {
Thomas Pedersen54ef6562011-08-11 19:35:12 -0700288 case WLAN_SP_MESH_PEERING_OPEN:
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100289 break;
Thomas Pedersen54ef6562011-08-11 19:35:12 -0700290 case WLAN_SP_MESH_PEERING_CONFIRM:
Thomas Pedersen8db09852011-08-12 20:01:00 -0700291 ie_len += 2;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100292 include_plid = true;
293 break;
Thomas Pedersen54ef6562011-08-11 19:35:12 -0700294 case WLAN_SP_MESH_PEERING_CLOSE:
Thomas Pedersen8db09852011-08-12 20:01:00 -0700295 if (plid) {
296 ie_len += 2;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100297 include_plid = true;
298 }
Thomas Pedersen8db09852011-08-12 20:01:00 -0700299 ie_len += 2; /* reason code */
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100300 break;
Thomas Pedersen8db09852011-08-12 20:01:00 -0700301 default:
Thomas Pedersenf609a432012-08-03 12:21:35 -0700302 err = -EINVAL;
303 goto free;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100304 }
305
Thomas Pedersen8db09852011-08-12 20:01:00 -0700306 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
Thomas Pedersenf609a432012-08-03 12:21:35 -0700307 goto free;
Thomas Pedersen8db09852011-08-12 20:01:00 -0700308
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100309 pos = skb_put(skb, 2 + ie_len);
Thomas Pedersen8db09852011-08-12 20:01:00 -0700310 *pos++ = WLAN_EID_PEER_MGMT;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100311 *pos++ = ie_len;
Thomas Pedersen8db09852011-08-12 20:01:00 -0700312 memcpy(pos, &peering_proto, 2);
313 pos += 2;
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800314 put_unaligned_le16(llid, pos);
Thomas Pedersen8db09852011-08-12 20:01:00 -0700315 pos += 2;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100316 if (include_plid) {
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800317 put_unaligned_le16(plid, pos);
Thomas Pedersen8db09852011-08-12 20:01:00 -0700318 pos += 2;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100319 }
Thomas Pedersen54ef6562011-08-11 19:35:12 -0700320 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800321 put_unaligned_le16(reason, pos);
Thomas Pedersen8db09852011-08-12 20:01:00 -0700322 pos += 2;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100323 }
Thomas Pedersen176f3602011-10-26 14:47:27 -0700324
325 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
Johannes Bergbf7cd942013-02-15 14:40:31 +0100326 if (mesh_add_ht_cap_ie(sdata, skb) ||
Bob Copelandc85fb532015-08-27 09:00:18 -0400327 mesh_add_ht_oper_ie(sdata, skb) ||
328 mesh_add_vht_cap_ie(sdata, skb) ||
329 mesh_add_vht_oper_ie(sdata, skb))
Thomas Pedersenf609a432012-08-03 12:21:35 -0700330 goto free;
Thomas Pedersen176f3602011-10-26 14:47:27 -0700331 }
332
Johannes Bergbf7cd942013-02-15 14:40:31 +0100333 if (mesh_add_vendor_ies(sdata, skb))
Thomas Pedersenf609a432012-08-03 12:21:35 -0700334 goto free;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100335
Johannes Berg62ae67b2009-11-18 18:42:05 +0100336 ieee80211_tx_skb(sdata, skb);
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100337 return 0;
Thomas Pedersenf609a432012-08-03 12:21:35 -0700338free:
339 kfree_skb(skb);
340 return err;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100341}
342
Bob Copelandfa87a652015-07-14 08:31:57 -0400343/**
344 * __mesh_plink_deactivate - deactivate mesh peer link
345 *
346 * @sta: mesh peer link to deactivate
347 *
Bob Copelande596af82016-03-26 11:27:19 -0400348 * Mesh paths with this peer as next hop should be flushed
349 * by the caller outside of plink_lock.
350 *
Bob Copelandfa87a652015-07-14 08:31:57 -0400351 * Returns beacon changed flag if the beacon content changed.
352 *
353 * Locking: the caller must hold sta->mesh->plink_lock
354 */
355static u32 __mesh_plink_deactivate(struct sta_info *sta)
356{
357 struct ieee80211_sub_if_data *sdata = sta->sdata;
358 u32 changed = 0;
359
360 lockdep_assert_held(&sta->mesh->plink_lock);
361
362 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
363 changed = mesh_plink_dec_estab_count(sdata);
364 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
Bob Copelandfa87a652015-07-14 08:31:57 -0400365
366 ieee80211_mps_sta_status_update(sta);
367 changed |= ieee80211_mps_set_sta_local_pm(sta,
368 NL80211_MESH_POWER_UNKNOWN);
369
370 return changed;
371}
372
373/**
374 * mesh_plink_deactivate - deactivate mesh peer link
375 *
376 * @sta: mesh peer link to deactivate
377 *
378 * All mesh paths with this peer as next hop will be flushed
379 */
380u32 mesh_plink_deactivate(struct sta_info *sta)
381{
382 struct ieee80211_sub_if_data *sdata = sta->sdata;
383 u32 changed;
384
385 spin_lock_bh(&sta->mesh->plink_lock);
386 changed = __mesh_plink_deactivate(sta);
Bob Copelandefc401f2016-06-25 19:14:16 -0400387
388 if (!sdata->u.mesh.user_mpm) {
389 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
390 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
391 sta->sta.addr, sta->mesh->llid,
392 sta->mesh->plid, sta->mesh->reason);
393 }
Bob Copelandfa87a652015-07-14 08:31:57 -0400394 spin_unlock_bh(&sta->mesh->plink_lock);
Bob Copelandefc401f2016-06-25 19:14:16 -0400395 if (!sdata->u.mesh.user_mpm)
396 del_timer_sync(&sta->mesh->plink_timer);
Bob Copelande596af82016-03-26 11:27:19 -0400397 mesh_path_flush_by_nexthop(sta);
Bob Copelandfa87a652015-07-14 08:31:57 -0400398
Bob Copelandefc401f2016-06-25 19:14:16 -0400399 /* make sure no readers can access nexthop sta from here on */
400 synchronize_net();
401
Bob Copelandfa87a652015-07-14 08:31:57 -0400402 return changed;
403}
404
Thomas Pedersen296fcba32013-01-23 12:18:12 -0800405static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
406 struct sta_info *sta,
407 struct ieee802_11_elems *elems, bool insert)
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100408{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200409 struct ieee80211_local *local = sdata->local;
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700410 struct ieee80211_supported_band *sband;
Thomas Pedersenf68d7762013-01-23 12:18:13 -0800411 u32 rates, basic_rates = 0, changed = 0;
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +0100412 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100413
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +0530414 sband = ieee80211_get_sband(sdata);
415 if (!sband)
416 return;
417
418 rates = ieee80211_sta_get_rates(sdata, elems, sband->band,
419 &basic_rates);
Johannes Bergd0709a62008-02-25 16:27:46 +0100420
Johannes Berg433f5bc2015-06-17 10:31:00 +0200421 spin_lock_bh(&sta->mesh->plink_lock);
Johannes Berge5a9f8d2015-10-16 17:54:47 +0200422 sta->rx_stats.last_rx = jiffies;
Thomas Pedersen296fcba32013-01-23 12:18:12 -0800423
424 /* rates and capabilities don't change during peering */
Johannes Berg433f5bc2015-06-17 10:31:00 +0200425 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
426 sta->mesh->processed_beacon)
Thomas Pedersen296fcba32013-01-23 12:18:12 -0800427 goto out;
Johannes Berg433f5bc2015-06-17 10:31:00 +0200428 sta->mesh->processed_beacon = true;
Chun-Yeow Yeohbae35d92012-07-24 11:52:35 +0800429
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +0530430 if (sta->sta.supp_rates[sband->band] != rates)
Thomas Pedersenf68d7762013-01-23 12:18:13 -0800431 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +0530432 sta->sta.supp_rates[sband->band] = rates;
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700433
Thomas Pedersen52ac8c42013-02-16 10:41:04 -0800434 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
435 elems->ht_cap_elem, sta))
436 changed |= IEEE80211_RC_BW_CHANGED;
Johannes Berg4bf88532012-11-09 11:39:59 +0100437
Bob Copelandc85fb532015-08-27 09:00:18 -0400438 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
439 elems->vht_cap_elem, sta);
440
Janusz.Dziedzic@tieto.comabcff6e2015-03-20 06:37:01 +0100441 if (bw != sta->sta.bandwidth)
442 changed |= IEEE80211_RC_BW_CHANGED;
443
Thomas Pedersen52ac8c42013-02-16 10:41:04 -0800444 /* HT peer is operating 20MHz-only */
445 if (elems->ht_operation &&
446 !(elems->ht_operation->ht_param &
447 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
448 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
Thomas Pedersenf68d7762013-01-23 12:18:13 -0800449 changed |= IEEE80211_RC_BW_CHANGED;
Thomas Pedersen52ac8c42013-02-16 10:41:04 -0800450 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -0700451 }
Thomas Pedersenc7d25822012-04-26 15:01:07 -0700452
Helmut Schaa59cf1d62012-11-27 18:03:13 +0100453 if (insert)
454 rate_control_rate_init(sta);
Thomas Pedersenf68d7762013-01-23 12:18:13 -0800455 else
456 rate_control_rate_update(local, sband, sta, changed);
Thomas Pedersen296fcba32013-01-23 12:18:12 -0800457out:
Johannes Berg433f5bc2015-06-17 10:31:00 +0200458 spin_unlock_bh(&sta->mesh->plink_lock);
Thomas Pedersen296fcba32013-01-23 12:18:12 -0800459}
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700460
Bob Copeland0e0060f2015-07-14 08:31:59 -0400461static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
462{
463 struct sta_info *sta;
464 unsigned long *aid_map;
465 int aid;
466
467 aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
468 sizeof(*aid_map), GFP_KERNEL);
469 if (!aid_map)
470 return -ENOMEM;
471
472 /* reserve aid 0 for mcast indication */
473 __set_bit(0, aid_map);
474
475 rcu_read_lock();
476 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
477 __set_bit(sta->sta.aid, aid_map);
478 rcu_read_unlock();
479
480 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
481 kfree(aid_map);
482
483 if (aid > IEEE80211_MAX_AID)
484 return -ENOBUFS;
485
486 return aid;
487}
488
Thomas Pedersen296fcba32013-01-23 12:18:12 -0800489static struct sta_info *
490__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
491{
492 struct sta_info *sta;
Bob Copeland0e0060f2015-07-14 08:31:59 -0400493 int aid;
Thomas Pedersen296fcba32013-01-23 12:18:12 -0800494
495 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
Thomas Pedersene87278e2012-04-26 15:01:06 -0700496 return NULL;
497
Bob Copeland0e0060f2015-07-14 08:31:59 -0400498 aid = mesh_allocate_aid(sdata);
499 if (aid < 0)
500 return NULL;
501
Thomas Pedersen296fcba32013-01-23 12:18:12 -0800502 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
503 if (!sta)
504 return NULL;
505
Johannes Berg433f5bc2015-06-17 10:31:00 +0200506 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
Johannes Berga74a8c82014-07-22 14:50:47 +0200507 sta->sta.wme = true;
Bob Copeland0e0060f2015-07-14 08:31:59 -0400508 sta->sta.aid = aid;
Thomas Pedersen296fcba32013-01-23 12:18:12 -0800509
510 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
511 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
512 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
513
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700514 return sta;
515}
516
Thomas Pedersen296fcba32013-01-23 12:18:12 -0800517static struct sta_info *
518mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
519 struct ieee802_11_elems *elems)
520{
521 struct sta_info *sta = NULL;
522
Thomas Pedersena6dad6a2013-03-04 13:06:12 -0800523 /* Userspace handles station allocation */
524 if (sdata->u.mesh.user_mpm ||
Masashi Honma11197d02016-11-30 09:06:04 +0900525 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
526 if (mesh_peer_accepts_plinks(elems) &&
527 mesh_plink_availables(sdata))
528 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
529 elems->ie_start,
530 elems->total_len,
531 GFP_KERNEL);
532 } else
Thomas Pedersen296fcba32013-01-23 12:18:12 -0800533 sta = __mesh_sta_info_alloc(sdata, addr);
534
535 return sta;
536}
537
538/*
539 * mesh_sta_info_get - return mesh sta info entry for @addr.
540 *
541 * @sdata: local meshif
542 * @addr: peer's address
543 * @elems: IEs from beacon or mesh peering frame.
544 *
545 * Return existing or newly allocated sta_info under RCU read lock.
546 * (re)initialize with given IEs.
547 */
548static struct sta_info *
549mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
550 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
551{
552 struct sta_info *sta = NULL;
553
554 rcu_read_lock();
555 sta = sta_info_get(sdata, addr);
556 if (sta) {
557 mesh_sta_info_init(sdata, sta, elems, false);
558 } else {
559 rcu_read_unlock();
560 /* can't run atomic */
561 sta = mesh_sta_info_alloc(sdata, addr, elems);
562 if (!sta) {
563 rcu_read_lock();
564 return NULL;
565 }
566
Thomas Pedersen3b4797b2013-01-26 17:00:02 -0800567 mesh_sta_info_init(sdata, sta, elems, true);
568
Thomas Pedersen296fcba32013-01-23 12:18:12 -0800569 if (sta_info_insert_rcu(sta))
570 return NULL;
571 }
572
573 return sta;
574}
575
576/*
577 * mesh_neighbour_update - update or initialize new mesh neighbor.
578 *
579 * @sdata: local meshif
580 * @addr: peer's address
581 * @elems: IEs from beacon or mesh peering frame
582 *
583 * Initiates peering if appropriate.
584 */
Thomas Pedersenf743ff42012-04-18 19:23:43 -0700585void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
586 u8 *hw_addr,
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700587 struct ieee802_11_elems *elems)
588{
589 struct sta_info *sta;
Thomas Pedersen39886b62013-02-13 12:14:19 -0800590 u32 changed = 0;
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700591
Thomas Pedersen296fcba32013-01-23 12:18:12 -0800592 sta = mesh_sta_info_get(sdata, hw_addr, elems);
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700593 if (!sta)
594 goto out;
595
Javier Cardona1570ca52011-04-07 15:08:35 -0700596 if (mesh_peer_accepts_plinks(elems) &&
Johannes Berg433f5bc2015-06-17 10:31:00 +0200597 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700598 sdata->u.mesh.accepting_plinks &&
599 sdata->u.mesh.mshcfg.auto_open_plinks &&
Bob Copeland36c9bb22013-11-05 11:16:54 -0800600 rssi_threshold_check(sdata, sta))
Thomas Pedersen39886b62013-02-13 12:14:19 -0800601 changed = mesh_plink_open(sta);
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100602
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100603 ieee80211_mps_frame_release(sta, elems);
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -0700604out:
Johannes Bergd0709a62008-02-25 16:27:46 +0100605 rcu_read_unlock();
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800606 ieee80211_mbss_info_change_notify(sdata, changed);
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100607}
608
609static void mesh_plink_timer(unsigned long data)
610{
611 struct sta_info *sta;
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800612 u16 reason = 0;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100613 struct ieee80211_sub_if_data *sdata;
Marco Porsch453e66f2012-11-21 18:40:32 -0800614 struct mesh_config *mshcfg;
Thomas Pedersen4efec45132013-11-05 11:16:50 -0800615 enum ieee80211_self_protected_actioncode action = 0;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100616
Johannes Bergd0709a62008-02-25 16:27:46 +0100617 /*
618 * This STA is valid because sta_info_destroy() will
619 * del_timer_sync() this timer after having made sure
620 * it cannot be readded (by deleting the plink.)
621 */
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100622 sta = (struct sta_info *) data;
623
Stanislaw Gruszka690205f2013-02-28 10:55:29 +0100624 if (sta->sdata->local->quiescing)
Johannes Berg5bb644a2009-05-17 11:40:42 +0200625 return;
Johannes Berg5bb644a2009-05-17 11:40:42 +0200626
Johannes Berg433f5bc2015-06-17 10:31:00 +0200627 spin_lock_bh(&sta->mesh->plink_lock);
Bob Copeland2b470c32014-06-04 09:27:31 -0400628
629 /* If a timer fires just before a state transition on another CPU,
630 * we may have already extended the timeout and changed state by the
631 * time we've acquired the lock and arrived here. In that case,
632 * skip this timer and wait for the new one.
633 */
Johannes Berg433f5bc2015-06-17 10:31:00 +0200634 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
Bob Copeland2b470c32014-06-04 09:27:31 -0400635 mpl_dbg(sta->sdata,
636 "Ignoring timer for %pM in state %s (timer adjusted)",
Johannes Berg433f5bc2015-06-17 10:31:00 +0200637 sta->sta.addr, mplstates[sta->mesh->plink_state]);
638 spin_unlock_bh(&sta->mesh->plink_lock);
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100639 return;
640 }
Bob Copeland2b470c32014-06-04 09:27:31 -0400641
642 /* del_timer() and handler may race when entering these states */
Johannes Berg433f5bc2015-06-17 10:31:00 +0200643 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
644 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
Bob Copeland2b470c32014-06-04 09:27:31 -0400645 mpl_dbg(sta->sdata,
646 "Ignoring timer for %pM in state %s (timer deleted)",
Johannes Berg433f5bc2015-06-17 10:31:00 +0200647 sta->sta.addr, mplstates[sta->mesh->plink_state]);
648 spin_unlock_bh(&sta->mesh->plink_lock);
Bob Copeland2b470c32014-06-04 09:27:31 -0400649 return;
650 }
651
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200652 mpl_dbg(sta->sdata,
Thomas Pedersen3088f7d2013-04-08 11:06:16 -0700653 "Mesh plink timer for %pM fired on state %s\n",
Johannes Berg433f5bc2015-06-17 10:31:00 +0200654 sta->sta.addr, mplstates[sta->mesh->plink_state]);
Johannes Bergd0709a62008-02-25 16:27:46 +0100655 sdata = sta->sdata;
Marco Porsch453e66f2012-11-21 18:40:32 -0800656 mshcfg = &sdata->u.mesh.mshcfg;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100657
Johannes Berg433f5bc2015-06-17 10:31:00 +0200658 switch (sta->mesh->plink_state) {
Javier Cardona57cf8042011-05-13 10:45:43 -0700659 case NL80211_PLINK_OPN_RCVD:
660 case NL80211_PLINK_OPN_SNT:
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100661 /* retry timer */
Johannes Berg433f5bc2015-06-17 10:31:00 +0200662 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100663 u32 rand;
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200664 mpl_dbg(sta->sdata,
665 "Mesh plink for %pM (retry, timeout): %d %d\n",
Johannes Berg433f5bc2015-06-17 10:31:00 +0200666 sta->sta.addr, sta->mesh->plink_retries,
667 sta->mesh->plink_timeout);
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100668 get_random_bytes(&rand, sizeof(u32));
Johannes Berg433f5bc2015-06-17 10:31:00 +0200669 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
670 rand % sta->mesh->plink_timeout;
671 ++sta->mesh->plink_retries;
672 mod_plink_timer(sta, sta->mesh->plink_timeout);
Thomas Pedersen4efec45132013-11-05 11:16:50 -0800673 action = WLAN_SP_MESH_PEERING_OPEN;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100674 break;
675 }
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800676 reason = WLAN_REASON_MESH_MAX_RETRIES;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100677 /* fall through on else */
Javier Cardona57cf8042011-05-13 10:45:43 -0700678 case NL80211_PLINK_CNF_RCVD:
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100679 /* confirm timer */
680 if (!reason)
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800681 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
Johannes Berg433f5bc2015-06-17 10:31:00 +0200682 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
Marco Porsch453e66f2012-11-21 18:40:32 -0800683 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
Thomas Pedersen4efec45132013-11-05 11:16:50 -0800684 action = WLAN_SP_MESH_PEERING_CLOSE;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100685 break;
Javier Cardona57cf8042011-05-13 10:45:43 -0700686 case NL80211_PLINK_HOLDING:
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100687 /* holding timer */
Johannes Berg433f5bc2015-06-17 10:31:00 +0200688 del_timer(&sta->mesh->plink_timer);
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100689 mesh_plink_fsm_restart(sta);
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100690 break;
691 default:
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100692 break;
693 }
Johannes Berg433f5bc2015-06-17 10:31:00 +0200694 spin_unlock_bh(&sta->mesh->plink_lock);
Thomas Pedersen4efec45132013-11-05 11:16:50 -0800695 if (action)
Bob Copelanda69bd8e2015-07-14 08:31:58 -0400696 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
Johannes Berg433f5bc2015-06-17 10:31:00 +0200697 sta->mesh->llid, sta->mesh->plid, reason);
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100698}
699
Nicholas Mc Guire0df2f6c2015-03-02 04:54:14 -0500700static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100701{
Johannes Berg433f5bc2015-06-17 10:31:00 +0200702 sta->mesh->plink_timer.expires = jiffies + msecs_to_jiffies(timeout);
703 sta->mesh->plink_timer.data = (unsigned long) sta;
704 sta->mesh->plink_timer.function = mesh_plink_timer;
705 sta->mesh->plink_timeout = timeout;
706 add_timer(&sta->mesh->plink_timer);
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100707}
708
Thomas Pedersen204d1302013-11-05 11:17:05 -0800709static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800710 u16 llid)
Thomas Pedersen204d1302013-11-05 11:17:05 -0800711{
712 struct ieee80211_local *local = sdata->local;
713 bool in_use = false;
714 struct sta_info *sta;
715
716 rcu_read_lock();
717 list_for_each_entry_rcu(sta, &local->sta_list, list) {
Matthias Schiffer520c75d2015-10-24 21:25:51 +0200718 if (sdata != sta->sdata)
719 continue;
720
Johannes Berg433f5bc2015-06-17 10:31:00 +0200721 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
Thomas Pedersen204d1302013-11-05 11:17:05 -0800722 in_use = true;
723 break;
724 }
725 }
726 rcu_read_unlock();
727
728 return in_use;
729}
730
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800731static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
Thomas Pedersen204d1302013-11-05 11:17:05 -0800732{
733 u16 llid;
734
735 do {
736 get_random_bytes(&llid, sizeof(llid));
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800737 } while (llid_in_use(sdata, llid));
Thomas Pedersen204d1302013-11-05 11:17:05 -0800738
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800739 return llid;
Thomas Pedersen204d1302013-11-05 11:17:05 -0800740}
741
Thomas Pedersen39886b62013-02-13 12:14:19 -0800742u32 mesh_plink_open(struct sta_info *sta)
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100743{
Johannes Bergd0709a62008-02-25 16:27:46 +0100744 struct ieee80211_sub_if_data *sdata = sta->sdata;
Thomas Pedersen39886b62013-02-13 12:14:19 -0800745 u32 changed;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100746
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200747 if (!test_sta_flag(sta, WLAN_STA_AUTH))
Thomas Pedersen39886b62013-02-13 12:14:19 -0800748 return 0;
Javier Cardona53e80512011-04-07 15:08:32 -0700749
Johannes Berg433f5bc2015-06-17 10:31:00 +0200750 spin_lock_bh(&sta->mesh->plink_lock);
751 sta->mesh->llid = mesh_get_new_llid(sdata);
752 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
753 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
754 spin_unlock_bh(&sta->mesh->plink_lock);
Thomas Pedersen39886b62013-02-13 12:14:19 -0800755 return 0;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100756 }
Johannes Berg433f5bc2015-06-17 10:31:00 +0200757 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
Marco Porsch453e66f2012-11-21 18:40:32 -0800758 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
Johannes Berg433f5bc2015-06-17 10:31:00 +0200759 spin_unlock_bh(&sta->mesh->plink_lock);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200760 mpl_dbg(sdata,
761 "Mesh plink: starting establishment with %pM\n",
Johannes Berg0c68ae262008-10-27 15:56:10 -0700762 sta->sta.addr);
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100763
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100764 /* set the non-peer mode to active during peering */
Thomas Pedersen39886b62013-02-13 12:14:19 -0800765 changed = ieee80211_mps_local_status_update(sdata);
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100766
Bob Copelanda69bd8e2015-07-14 08:31:58 -0400767 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
Johannes Berg433f5bc2015-06-17 10:31:00 +0200768 sta->sta.addr, sta->mesh->llid, 0, 0);
Thomas Pedersen39886b62013-02-13 12:14:19 -0800769 return changed;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100770}
771
Thomas Pedersen39886b62013-02-13 12:14:19 -0800772u32 mesh_plink_block(struct sta_info *sta)
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100773{
Marco Porschdf323812012-08-08 07:58:43 +0200774 u32 changed;
John W. Linvillec9370192010-06-21 17:14:07 -0400775
Johannes Berg433f5bc2015-06-17 10:31:00 +0200776 spin_lock_bh(&sta->mesh->plink_lock);
Marco Porschdf323812012-08-08 07:58:43 +0200777 changed = __mesh_plink_deactivate(sta);
Johannes Berg433f5bc2015-06-17 10:31:00 +0200778 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
779 spin_unlock_bh(&sta->mesh->plink_lock);
Bob Copelande596af82016-03-26 11:27:19 -0400780 mesh_path_flush_by_nexthop(sta);
John W. Linvillec9370192010-06-21 17:14:07 -0400781
Thomas Pedersen39886b62013-02-13 12:14:19 -0800782 return changed;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +0100783}
784
Bob Copelande76d67f2013-11-05 11:16:52 -0800785static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
786 struct sta_info *sta,
787 enum plink_event event)
788{
789 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800790 u16 reason = (event == CLS_ACPT) ?
791 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
Bob Copelande76d67f2013-11-05 11:16:52 -0800792
Johannes Berg433f5bc2015-06-17 10:31:00 +0200793 sta->mesh->reason = reason;
794 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
Bob Copeland272a9e22013-11-05 11:16:56 -0800795 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
Bob Copelande76d67f2013-11-05 11:16:52 -0800796}
797
798static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
799 struct sta_info *sta)
800{
801 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
802 u32 changed = 0;
803
Johannes Berg433f5bc2015-06-17 10:31:00 +0200804 del_timer(&sta->mesh->plink_timer);
805 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
Bob Copelande76d67f2013-11-05 11:16:52 -0800806 changed |= mesh_plink_inc_estab_count(sdata);
807 changed |= mesh_set_ht_prot_mode(sdata);
808 changed |= mesh_set_short_slot_time(sdata);
809 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
810 ieee80211_mps_sta_status_update(sta);
811 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
812 return changed;
813}
814
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800815/**
816 * mesh_plink_fsm - step @sta MPM based on @event
817 *
818 * @sdata: interface
819 * @sta: mesh neighbor
820 * @event: peering event
821 *
822 * Return: changed MBSS flags
823 */
824static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
825 struct sta_info *sta, enum plink_event event)
826{
827 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
828 enum ieee80211_self_protected_actioncode action = 0;
829 u32 changed = 0;
Bob Copelande596af82016-03-26 11:27:19 -0400830 bool flush = false;
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800831
832 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
Johannes Berg433f5bc2015-06-17 10:31:00 +0200833 mplstates[sta->mesh->plink_state], mplevents[event]);
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800834
Johannes Berg433f5bc2015-06-17 10:31:00 +0200835 spin_lock_bh(&sta->mesh->plink_lock);
836 switch (sta->mesh->plink_state) {
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800837 case NL80211_PLINK_LISTEN:
838 switch (event) {
839 case CLS_ACPT:
840 mesh_plink_fsm_restart(sta);
841 break;
842 case OPN_ACPT:
Johannes Berg433f5bc2015-06-17 10:31:00 +0200843 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
844 sta->mesh->llid = mesh_get_new_llid(sdata);
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800845 mesh_plink_timer_set(sta,
846 mshcfg->dot11MeshRetryTimeout);
847
848 /* set the non-peer mode to active during peering */
849 changed |= ieee80211_mps_local_status_update(sdata);
850 action = WLAN_SP_MESH_PEERING_OPEN;
851 break;
852 default:
853 break;
854 }
855 break;
856 case NL80211_PLINK_OPN_SNT:
857 switch (event) {
858 case OPN_RJCT:
859 case CNF_RJCT:
860 case CLS_ACPT:
861 mesh_plink_close(sdata, sta, event);
862 action = WLAN_SP_MESH_PEERING_CLOSE;
863 break;
864 case OPN_ACPT:
865 /* retry timer is left untouched */
Johannes Berg433f5bc2015-06-17 10:31:00 +0200866 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800867 action = WLAN_SP_MESH_PEERING_CONFIRM;
868 break;
869 case CNF_ACPT:
Johannes Berg433f5bc2015-06-17 10:31:00 +0200870 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
Bob Copeland2b470c32014-06-04 09:27:31 -0400871 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800872 break;
873 default:
874 break;
875 }
876 break;
877 case NL80211_PLINK_OPN_RCVD:
878 switch (event) {
879 case OPN_RJCT:
880 case CNF_RJCT:
881 case CLS_ACPT:
882 mesh_plink_close(sdata, sta, event);
883 action = WLAN_SP_MESH_PEERING_CLOSE;
884 break;
885 case OPN_ACPT:
886 action = WLAN_SP_MESH_PEERING_CONFIRM;
887 break;
888 case CNF_ACPT:
889 changed |= mesh_plink_establish(sdata, sta);
890 break;
891 default:
892 break;
893 }
894 break;
895 case NL80211_PLINK_CNF_RCVD:
896 switch (event) {
897 case OPN_RJCT:
898 case CNF_RJCT:
899 case CLS_ACPT:
900 mesh_plink_close(sdata, sta, event);
901 action = WLAN_SP_MESH_PEERING_CLOSE;
902 break;
903 case OPN_ACPT:
904 changed |= mesh_plink_establish(sdata, sta);
905 action = WLAN_SP_MESH_PEERING_CONFIRM;
906 break;
907 default:
908 break;
909 }
910 break;
911 case NL80211_PLINK_ESTAB:
912 switch (event) {
913 case CLS_ACPT:
914 changed |= __mesh_plink_deactivate(sta);
915 changed |= mesh_set_ht_prot_mode(sdata);
916 changed |= mesh_set_short_slot_time(sdata);
917 mesh_plink_close(sdata, sta, event);
918 action = WLAN_SP_MESH_PEERING_CLOSE;
Bob Copelande596af82016-03-26 11:27:19 -0400919 flush = true;
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800920 break;
921 case OPN_ACPT:
922 action = WLAN_SP_MESH_PEERING_CONFIRM;
923 break;
924 default:
925 break;
926 }
927 break;
928 case NL80211_PLINK_HOLDING:
929 switch (event) {
930 case CLS_ACPT:
Johannes Berg433f5bc2015-06-17 10:31:00 +0200931 del_timer(&sta->mesh->plink_timer);
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800932 mesh_plink_fsm_restart(sta);
933 break;
934 case OPN_ACPT:
935 case CNF_ACPT:
936 case OPN_RJCT:
937 case CNF_RJCT:
938 action = WLAN_SP_MESH_PEERING_CLOSE;
939 break;
940 default:
941 break;
942 }
943 break;
944 default:
945 /* should not get here, PLINK_BLOCKED is dealt with at the
946 * beginning of the function
947 */
948 break;
949 }
Johannes Berg433f5bc2015-06-17 10:31:00 +0200950 spin_unlock_bh(&sta->mesh->plink_lock);
Bob Copelande596af82016-03-26 11:27:19 -0400951 if (flush)
952 mesh_path_flush_by_nexthop(sta);
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800953 if (action) {
Bob Copelanda69bd8e2015-07-14 08:31:58 -0400954 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
Johannes Berg433f5bc2015-06-17 10:31:00 +0200955 sta->mesh->llid, sta->mesh->plid,
956 sta->mesh->reason);
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800957
958 /* also send confirm in open case */
959 if (action == WLAN_SP_MESH_PEERING_OPEN) {
Bob Copelanda69bd8e2015-07-14 08:31:58 -0400960 mesh_plink_frame_tx(sdata, sta,
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800961 WLAN_SP_MESH_PEERING_CONFIRM,
Johannes Berg433f5bc2015-06-17 10:31:00 +0200962 sta->sta.addr, sta->mesh->llid,
963 sta->mesh->plid, 0);
Thomas Pedersenc7e67812013-11-05 11:17:02 -0800964 }
965 }
966
967 return changed;
968}
969
Thomas Pedersenc99a89e2013-11-05 11:17:03 -0800970/*
971 * mesh_plink_get_event - get correct MPM event
972 *
973 * @sdata: interface
974 * @sta: peer, leave NULL if processing a frame from a new suitable peer
975 * @elems: peering management IEs
976 * @ftype: frame type
977 * @llid: peer's peer link ID
978 * @plid: peer's local link ID
979 *
980 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
981 * an error.
982 */
983static enum plink_event
984mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
985 struct sta_info *sta,
986 struct ieee802_11_elems *elems,
987 enum ieee80211_self_protected_actioncode ftype,
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +0800988 u16 llid, u16 plid)
Thomas Pedersenc99a89e2013-11-05 11:17:03 -0800989{
990 enum plink_event event = PLINK_UNDEFINED;
991 u8 ie_len = elems->peering_len;
992 bool matches_local;
993
994 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
995 mesh_matches_local(sdata, elems));
996
997 /* deny open request from non-matching peer */
998 if (!matches_local && !sta) {
999 event = OPN_RJCT;
1000 goto out;
1001 }
1002
1003 if (!sta) {
1004 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1005 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1006 goto out;
1007 }
1008 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1009 if (!mesh_plink_free_count(sdata)) {
1010 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1011 goto out;
1012 }
Sunil Shahub8631c02016-01-21 11:06:25 +05301013
1014 /* new matching peer */
1015 event = OPN_ACPT;
1016 goto out;
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001017 } else {
1018 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1019 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1020 goto out;
1021 }
Johannes Berg433f5bc2015-06-17 10:31:00 +02001022 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001023 goto out;
1024 }
1025
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001026 switch (ftype) {
1027 case WLAN_SP_MESH_PEERING_OPEN:
1028 if (!matches_local)
1029 event = OPN_RJCT;
1030 if (!mesh_plink_free_count(sdata) ||
Johannes Berg433f5bc2015-06-17 10:31:00 +02001031 (sta->mesh->plid && sta->mesh->plid != plid))
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001032 event = OPN_IGNR;
1033 else
1034 event = OPN_ACPT;
1035 break;
1036 case WLAN_SP_MESH_PEERING_CONFIRM:
1037 if (!matches_local)
1038 event = CNF_RJCT;
1039 if (!mesh_plink_free_count(sdata) ||
Johannes Berg433f5bc2015-06-17 10:31:00 +02001040 sta->mesh->llid != llid ||
1041 (sta->mesh->plid && sta->mesh->plid != plid))
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001042 event = CNF_IGNR;
1043 else
1044 event = CNF_ACPT;
1045 break;
1046 case WLAN_SP_MESH_PEERING_CLOSE:
Johannes Berg433f5bc2015-06-17 10:31:00 +02001047 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001048 /* Do not check for llid or plid. This does not
1049 * follow the standard but since multiple plinks
1050 * per sta are not supported, it is necessary in
1051 * order to avoid a livelock when MP A sees an
1052 * establish peer link to MP B but MP B does not
1053 * see it. This can be caused by a timeout in
1054 * B's peer link establishment or B beign
1055 * restarted.
1056 */
1057 event = CLS_ACPT;
Johannes Berg433f5bc2015-06-17 10:31:00 +02001058 else if (sta->mesh->plid != plid)
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001059 event = CLS_IGNR;
Johannes Berg433f5bc2015-06-17 10:31:00 +02001060 else if (ie_len == 8 && sta->mesh->llid != llid)
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001061 event = CLS_IGNR;
1062 else
1063 event = CLS_ACPT;
1064 break;
1065 default:
1066 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1067 break;
1068 }
1069
1070out:
1071 return event;
1072}
1073
Thomas Pedersen05a23ae2013-11-05 11:16:59 -08001074static void
1075mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1076 struct ieee80211_mgmt *mgmt,
1077 struct ieee802_11_elems *elems)
Luis Carlos Coboc3896d22008-02-23 15:17:13 +01001078{
Thomas Pedersen05a23ae2013-11-05 11:16:59 -08001079
Luis Carlos Coboc3896d22008-02-23 15:17:13 +01001080 struct sta_info *sta;
1081 enum plink_event event;
Thomas Pedersen54ef6562011-08-11 19:35:12 -07001082 enum ieee80211_self_protected_actioncode ftype;
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -07001083 u32 changed = 0;
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001084 u8 ie_len = elems->peering_len;
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +08001085 u16 plid, llid = 0;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +01001086
Thomas Pedersen05a23ae2013-11-05 11:16:59 -08001087 if (!elems->peering) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001088 mpl_dbg(sdata,
1089 "Mesh plink: missing necessary peer link ie\n");
Luis Carlos Coboc3896d22008-02-23 15:17:13 +01001090 return;
1091 }
Johannes Bergbf7cd942013-02-15 14:40:31 +01001092
Thomas Pedersen05a23ae2013-11-05 11:16:59 -08001093 if (elems->rsn_len &&
Johannes Bergbf7cd942013-02-15 14:40:31 +01001094 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001095 mpl_dbg(sdata,
1096 "Mesh plink: can't establish link with secure peer\n");
Javier Cardona5cff5e02011-04-07 15:08:29 -07001097 return;
1098 }
Luis Carlos Coboc3896d22008-02-23 15:17:13 +01001099
Thomas Pedersen8db09852011-08-12 20:01:00 -07001100 ftype = mgmt->u.action.u.self_prot.action_code;
Thomas Pedersen8db09852011-08-12 20:01:00 -07001101 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1102 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1103 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1104 && ie_len != 8)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001105 mpl_dbg(sdata,
1106 "Mesh plink: incorrect plink ie length %d %d\n",
1107 ftype, ie_len);
Luis Carlos Coboc3896d22008-02-23 15:17:13 +01001108 return;
1109 }
1110
Thomas Pedersen54ef6562011-08-11 19:35:12 -07001111 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
Thomas Pedersen05a23ae2013-11-05 11:16:59 -08001112 (!elems->mesh_id || !elems->mesh_config)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001113 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
Luis Carlos Coboc3896d22008-02-23 15:17:13 +01001114 return;
1115 }
1116 /* Note the lines below are correct, the llid in the frame is the plid
1117 * from the point of view of this host.
1118 */
Bob Copelandf8134fe2014-06-28 16:35:26 -04001119 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
Thomas Pedersen54ef6562011-08-11 19:35:12 -07001120 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
Bob Copelandf8134fe2014-06-28 16:35:26 -04001121 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1122 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
Luis Carlos Coboc3896d22008-02-23 15:17:13 +01001123
Thomas Pedersen296fcba32013-01-23 12:18:12 -08001124 /* WARNING: Only for sta pointer, is dropped & re-acquired */
Johannes Bergd0709a62008-02-25 16:27:46 +01001125 rcu_read_lock();
1126
Johannes Bergabe60632009-11-25 17:46:18 +01001127 sta = sta_info_get(sdata, mgmt->sa);
Bob Copeland32cb05b2013-11-05 11:16:53 -08001128
Ashok Nagarajan55335132012-02-28 17:04:08 -08001129 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
Bob Copeland36c9bb22013-11-05 11:16:54 -08001130 !rssi_threshold_check(sdata, sta)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001131 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
Ashok Nagarajan3d4f96992012-03-06 12:48:30 -08001132 mgmt->sa);
Thomas Pedersenfc103022013-11-05 11:17:00 -08001133 goto unlock_rcu;
Ashok Nagarajan55335132012-02-28 17:04:08 -08001134 }
1135
Luis Carlos Coboc3896d22008-02-23 15:17:13 +01001136 /* Now we will figure out the appropriate event... */
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001137 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -07001138
1139 if (event == OPN_ACPT) {
Thomas Pedersen296fcba32013-01-23 12:18:12 -08001140 rcu_read_unlock();
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -07001141 /* allocate sta entry if necessary and update info */
Thomas Pedersen05a23ae2013-11-05 11:16:59 -08001142 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -07001143 if (!sta) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001144 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
Thomas Pedersenfc103022013-11-05 11:17:00 -08001145 goto unlock_rcu;
Thomas Pedersen54ab1ff2012-04-18 19:23:42 -07001146 }
Johannes Berg433f5bc2015-06-17 10:31:00 +02001147 sta->mesh->plid = plid;
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001148 } else if (!sta && event == OPN_RJCT) {
Bob Copelanda69bd8e2015-07-14 08:31:58 -04001149 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001150 mgmt->sa, 0, plid,
Chun-Yeow Yeoh6f101ef2013-11-13 15:43:03 +08001151 WLAN_REASON_MESH_CONFIG);
Thomas Pedersenc99a89e2013-11-05 11:17:03 -08001152 goto unlock_rcu;
1153 } else if (!sta || event == PLINK_UNDEFINED) {
1154 /* something went wrong */
1155 goto unlock_rcu;
Luis Carlos Coboc3896d22008-02-23 15:17:13 +01001156 }
1157
Bob Copelanda69bd8e2015-07-14 08:31:58 -04001158 if (event == CNF_ACPT) {
1159 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
Bob Copeland0e0060f2015-07-14 08:31:59 -04001160 if (!sta->mesh->plid)
Bob Copelanda69bd8e2015-07-14 08:31:58 -04001161 sta->mesh->plid = plid;
Bob Copelanda69bd8e2015-07-14 08:31:58 -04001162
1163 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1164 }
Bob Copeland6c6fa492014-06-28 16:35:25 -04001165
Thomas Pedersenc7e67812013-11-05 11:17:02 -08001166 changed |= mesh_plink_fsm(sdata, sta, event);
Johannes Bergd0709a62008-02-25 16:27:46 +01001167
Thomas Pedersenfc103022013-11-05 11:17:00 -08001168unlock_rcu:
Johannes Bergd0709a62008-02-25 16:27:46 +01001169 rcu_read_unlock();
Ashok Nagarajan57aac7c2012-04-30 14:20:30 -07001170
Thomas Pedersenecccd072013-06-10 13:17:21 -07001171 if (changed)
Thomas Pedersen2b5e1962013-02-14 11:20:13 -08001172 ieee80211_mbss_info_change_notify(sdata, changed);
Luis Carlos Coboc3896d22008-02-23 15:17:13 +01001173}
Thomas Pedersen05a23ae2013-11-05 11:16:59 -08001174
1175void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1176 struct ieee80211_mgmt *mgmt, size_t len,
1177 struct ieee80211_rx_status *rx_status)
1178{
1179 struct ieee802_11_elems elems;
1180 size_t baselen;
1181 u8 *baseaddr;
1182
1183 /* need action_code, aux */
1184 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1185 return;
1186
1187 if (sdata->u.mesh.user_mpm)
1188 /* userspace must register for these */
1189 return;
1190
1191 if (is_multicast_ether_addr(mgmt->da)) {
1192 mpl_dbg(sdata,
1193 "Mesh plink: ignore frame from multicast address\n");
1194 return;
1195 }
1196
1197 baseaddr = mgmt->u.action.u.self_prot.variable;
1198 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1199 if (mgmt->u.action.u.self_prot.action_code ==
1200 WLAN_SP_MESH_PEERING_CONFIRM) {
1201 baseaddr += 4;
1202 baselen += 4;
Bob Copelandb3e7de82015-07-14 08:31:56 -04001203
1204 if (baselen > len)
1205 return;
Thomas Pedersen05a23ae2013-11-05 11:16:59 -08001206 }
1207 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1208 mesh_process_plink_frame(sdata, mgmt, &elems);
1209}