1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * OCB mode implementation 4 * 5 * Copyright: (c) 2014 Czech Technical University in Prague 6 * (c) 2014 Volkswagen Group Research 7 * Copyright (C) 2022 - 2023 Intel Corporation 8 * Author: Rostislav Lisovy <rostislav.lisovy@fel.cvut.cz> 9 * Funded by: Volkswagen Group Research 10 */ 11 12 #include <linux/delay.h> 13 #include <linux/if_ether.h> 14 #include <linux/skbuff.h> 15 #include <linux/if_arp.h> 16 #include <linux/etherdevice.h> 17 #include <linux/rtnetlink.h> 18 #include <net/mac80211.h> 19 #include <asm/unaligned.h> 20 21 #include "ieee80211_i.h" 22 #include "driver-ops.h" 23 #include "rate.h" 24 25 #define IEEE80211_OCB_HOUSEKEEPING_INTERVAL (60 * HZ) 26 #define IEEE80211_OCB_PEER_INACTIVITY_LIMIT (240 * HZ) 27 #define IEEE80211_OCB_MAX_STA_ENTRIES 128 28 29 /** 30 * enum ocb_deferred_task_flags - mac80211 OCB deferred tasks 31 * @OCB_WORK_HOUSEKEEPING: run the periodic OCB housekeeping tasks 32 * 33 * These flags are used in @wrkq_flags field of &struct ieee80211_if_ocb 34 */ 35 enum ocb_deferred_task_flags { 36 OCB_WORK_HOUSEKEEPING, 37 }; 38 39 void ieee80211_ocb_rx_no_sta(struct ieee80211_sub_if_data *sdata, 40 const u8 *bssid, const u8 *addr, 41 u32 supp_rates) 42 { 43 struct ieee80211_if_ocb *ifocb = &sdata->u.ocb; 44 struct ieee80211_local *local = sdata->local; 45 struct ieee80211_chanctx_conf *chanctx_conf; 46 struct ieee80211_supported_band *sband; 47 struct sta_info *sta; 48 int band; 49 50 /* XXX: Consider removing the least recently used entry and 51 * allow new one to be added. 52 */ 53 if (local->num_sta >= IEEE80211_OCB_MAX_STA_ENTRIES) { 54 net_info_ratelimited("%s: No room for a new OCB STA entry %pM\n", 55 sdata->name, addr); 56 return; 57 } 58 59 ocb_dbg(sdata, "Adding new OCB station %pM\n", addr); 60 61 rcu_read_lock(); 62 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 63 if (WARN_ON_ONCE(!chanctx_conf)) { 64 rcu_read_unlock(); 65 return; 66 } 67 band = chanctx_conf->def.chan->band; 68 rcu_read_unlock(); 69 70 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 71 if (!sta) 72 return; 73 74 /* Add only mandatory rates for now */ 75 sband = local->hw.wiphy->bands[band]; 76 sta->sta.deflink.supp_rates[band] = ieee80211_mandatory_rates(sband); 77 78 spin_lock(&ifocb->incomplete_lock); 79 list_add(&sta->list, &ifocb->incomplete_stations); 80 spin_unlock(&ifocb->incomplete_lock); 81 wiphy_work_queue(local->hw.wiphy, &sdata->work); 82 } 83 84 static struct sta_info *ieee80211_ocb_finish_sta(struct sta_info *sta) 85 __acquires(RCU) 86 { 87 struct ieee80211_sub_if_data *sdata = sta->sdata; 88 u8 addr[ETH_ALEN]; 89 90 memcpy(addr, sta->sta.addr, ETH_ALEN); 91 92 ocb_dbg(sdata, "Adding new IBSS station %pM (dev=%s)\n", 93 addr, sdata->name); 94 95 sta_info_move_state(sta, IEEE80211_STA_AUTH); 96 sta_info_move_state(sta, IEEE80211_STA_ASSOC); 97 sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED); 98 99 rate_control_rate_init(sta); 100 101 /* If it fails, maybe we raced another insertion? */ 102 if (sta_info_insert_rcu(sta)) 103 return sta_info_get(sdata, addr); 104 return sta; 105 } 106 107 static void ieee80211_ocb_housekeeping(struct ieee80211_sub_if_data *sdata) 108 { 109 struct ieee80211_if_ocb *ifocb = &sdata->u.ocb; 110 111 ocb_dbg(sdata, "Running ocb housekeeping\n"); 112 113 ieee80211_sta_expire(sdata, IEEE80211_OCB_PEER_INACTIVITY_LIMIT); 114 115 mod_timer(&ifocb->housekeeping_timer, 116 round_jiffies(jiffies + IEEE80211_OCB_HOUSEKEEPING_INTERVAL)); 117 } 118 119 void ieee80211_ocb_work(struct ieee80211_sub_if_data *sdata) 120 { 121 struct ieee80211_if_ocb *ifocb = &sdata->u.ocb; 122 struct sta_info *sta; 123 124 lockdep_assert_wiphy(sdata->local->hw.wiphy); 125 126 if (ifocb->joined != true) 127 return; 128 129 spin_lock_bh(&ifocb->incomplete_lock); 130 while (!list_empty(&ifocb->incomplete_stations)) { 131 sta = list_first_entry(&ifocb->incomplete_stations, 132 struct sta_info, list); 133 list_del(&sta->list); 134 spin_unlock_bh(&ifocb->incomplete_lock); 135 136 ieee80211_ocb_finish_sta(sta); 137 rcu_read_unlock(); 138 spin_lock_bh(&ifocb->incomplete_lock); 139 } 140 spin_unlock_bh(&ifocb->incomplete_lock); 141 142 if (test_and_clear_bit(OCB_WORK_HOUSEKEEPING, &ifocb->wrkq_flags)) 143 ieee80211_ocb_housekeeping(sdata); 144 } 145 146 static void ieee80211_ocb_housekeeping_timer(struct timer_list *t) 147 { 148 struct ieee80211_sub_if_data *sdata = 149 from_timer(sdata, t, u.ocb.housekeeping_timer); 150 struct ieee80211_local *local = sdata->local; 151 struct ieee80211_if_ocb *ifocb = &sdata->u.ocb; 152 153 set_bit(OCB_WORK_HOUSEKEEPING, &ifocb->wrkq_flags); 154 155 wiphy_work_queue(local->hw.wiphy, &sdata->work); 156 } 157 158 void ieee80211_ocb_setup_sdata(struct ieee80211_sub_if_data *sdata) 159 { 160 struct ieee80211_if_ocb *ifocb = &sdata->u.ocb; 161 162 timer_setup(&ifocb->housekeeping_timer, 163 ieee80211_ocb_housekeeping_timer, 0); 164 INIT_LIST_HEAD(&ifocb->incomplete_stations); 165 spin_lock_init(&ifocb->incomplete_lock); 166 } 167 168 int ieee80211_ocb_join(struct ieee80211_sub_if_data *sdata, 169 struct ocb_setup *setup) 170 { 171 struct ieee80211_local *local = sdata->local; 172 struct ieee80211_if_ocb *ifocb = &sdata->u.ocb; 173 u64 changed = BSS_CHANGED_OCB | BSS_CHANGED_BSSID; 174 int err; 175 176 lockdep_assert_wiphy(sdata->local->hw.wiphy); 177 178 if (ifocb->joined == true) 179 return -EINVAL; 180 181 sdata->deflink.operating_11g_mode = true; 182 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF; 183 sdata->deflink.needed_rx_chains = sdata->local->rx_chains; 184 185 err = ieee80211_link_use_channel(&sdata->deflink, &setup->chandef, 186 IEEE80211_CHANCTX_SHARED); 187 if (err) 188 return err; 189 190 ieee80211_bss_info_change_notify(sdata, changed); 191 192 ifocb->joined = true; 193 194 set_bit(OCB_WORK_HOUSEKEEPING, &ifocb->wrkq_flags); 195 wiphy_work_queue(local->hw.wiphy, &sdata->work); 196 197 netif_carrier_on(sdata->dev); 198 return 0; 199 } 200 201 int ieee80211_ocb_leave(struct ieee80211_sub_if_data *sdata) 202 { 203 struct ieee80211_if_ocb *ifocb = &sdata->u.ocb; 204 struct ieee80211_local *local = sdata->local; 205 struct sta_info *sta; 206 207 lockdep_assert_wiphy(sdata->local->hw.wiphy); 208 209 ifocb->joined = false; 210 sta_info_flush(sdata); 211 212 spin_lock_bh(&ifocb->incomplete_lock); 213 while (!list_empty(&ifocb->incomplete_stations)) { 214 sta = list_first_entry(&ifocb->incomplete_stations, 215 struct sta_info, list); 216 list_del(&sta->list); 217 spin_unlock_bh(&ifocb->incomplete_lock); 218 219 sta_info_free(local, sta); 220 spin_lock_bh(&ifocb->incomplete_lock); 221 } 222 spin_unlock_bh(&ifocb->incomplete_lock); 223 224 netif_carrier_off(sdata->dev); 225 clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); 226 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_OCB); 227 228 ieee80211_link_release_channel(&sdata->deflink); 229 230 skb_queue_purge(&sdata->skb_queue); 231 232 del_timer_sync(&sdata->u.ocb.housekeeping_timer); 233 /* If the timer fired while we waited for it, it will have 234 * requeued the work. Now the work will be running again 235 * but will not rearm the timer again because it checks 236 * whether we are connected to the network or not -- at this 237 * point we shouldn't be anymore. 238 */ 239 240 return 0; 241 } 242