Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2002-2005, Instant802 Networks, Inc. |
| 3 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
| 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 | */ |
| 9 | |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/netdevice.h> |
| 13 | #include <linux/types.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/skbuff.h> |
| 16 | #include <linux/if_arp.h> |
Johannes Berg | 0d17440 | 2007-12-17 15:07:43 +0100 | [diff] [blame] | 17 | #include <linux/timer.h> |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 18 | #include <linux/rtnetlink.h> |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 19 | |
| 20 | #include <net/mac80211.h> |
| 21 | #include "ieee80211_i.h" |
| 22 | #include "ieee80211_rate.h" |
| 23 | #include "sta_info.h" |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 24 | #include "debugfs_sta.h" |
Luis Carlos Cobo | ee38585 | 2008-02-23 15:17:11 +0100 | [diff] [blame] | 25 | #include "mesh.h" |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 26 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 27 | /** |
| 28 | * DOC: STA information lifetime rules |
| 29 | * |
| 30 | * STA info structures (&struct sta_info) are managed in a hash table |
| 31 | * for faster lookup and a list for iteration. They are managed using |
| 32 | * RCU, i.e. access to the list and hash table is protected by RCU. |
| 33 | * |
Johannes Berg | 03e4497 | 2008-02-27 09:56:40 +0100 | [diff] [blame] | 34 | * Upon allocating a STA info structure with sta_info_alloc(), the caller owns |
| 35 | * that structure. It must then either destroy it using sta_info_destroy() |
| 36 | * (which is pretty useless) or insert it into the hash table using |
| 37 | * sta_info_insert() which demotes the reference from ownership to a regular |
| 38 | * RCU-protected reference; if the function is called without protection by an |
| 39 | * RCU critical section the reference is instantly invalidated. |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 40 | * |
| 41 | * Because there are debugfs entries for each station, and adding those |
| 42 | * must be able to sleep, it is also possible to "pin" a station entry, |
| 43 | * that means it can be removed from the hash table but not be freed. |
Johannes Berg | dbbea67 | 2008-02-26 14:34:06 +0100 | [diff] [blame] | 44 | * See the comment in __sta_info_unlink() for more information. |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 45 | * |
| 46 | * In order to remove a STA info structure, the caller needs to first |
Johannes Berg | dbbea67 | 2008-02-26 14:34:06 +0100 | [diff] [blame] | 47 | * unlink it (sta_info_unlink()) from the list and hash tables and |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 48 | * then wait for an RCU synchronisation before it can be freed. Due to |
| 49 | * the pinning and the possibility of multiple callers trying to remove |
Johannes Berg | dbbea67 | 2008-02-26 14:34:06 +0100 | [diff] [blame] | 50 | * the same STA info at the same time, sta_info_unlink() can clear the |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 51 | * STA info pointer it is passed to indicate that the STA info is owned |
| 52 | * by somebody else now. |
| 53 | * |
Johannes Berg | dbbea67 | 2008-02-26 14:34:06 +0100 | [diff] [blame] | 54 | * If sta_info_unlink() did not clear the pointer then the caller owns |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 55 | * the STA info structure now and is responsible of destroying it with |
Johannes Berg | dbbea67 | 2008-02-26 14:34:06 +0100 | [diff] [blame] | 56 | * a call to sta_info_destroy(), not before RCU synchronisation, of |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 57 | * course. Note that sta_info_destroy() must be protected by the RTNL. |
| 58 | * |
| 59 | * In all other cases, there is no concept of ownership on a STA entry, |
| 60 | * each structure is owned by the global hash table/list until it is |
| 61 | * removed. All users of the structure need to be RCU protected so that |
| 62 | * the structure won't be freed before they are done using it. |
| 63 | */ |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 64 | |
| 65 | /* Caller must hold local->sta_lock */ |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 66 | static int sta_info_hash_del(struct ieee80211_local *local, |
| 67 | struct sta_info *sta) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 68 | { |
| 69 | struct sta_info *s; |
| 70 | |
| 71 | s = local->sta_hash[STA_HASH(sta->addr)]; |
| 72 | if (!s) |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 73 | return -ENOENT; |
| 74 | if (s == sta) { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 75 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->addr)], |
| 76 | s->hnext); |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 77 | return 0; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 78 | } |
| 79 | |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 80 | while (s->hnext && s->hnext != sta) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 81 | s = s->hnext; |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 82 | if (s->hnext) { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 83 | rcu_assign_pointer(s->hnext, sta->hnext); |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 84 | return 0; |
| 85 | } |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 86 | |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 87 | return -ENOENT; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 88 | } |
| 89 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 90 | /* protected by RCU */ |
Johannes Berg | 43ba7e9 | 2008-02-21 14:09:30 +0100 | [diff] [blame] | 91 | static struct sta_info *__sta_info_find(struct ieee80211_local *local, |
| 92 | u8 *addr) |
| 93 | { |
| 94 | struct sta_info *sta; |
| 95 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 96 | sta = rcu_dereference(local->sta_hash[STA_HASH(addr)]); |
Johannes Berg | 43ba7e9 | 2008-02-21 14:09:30 +0100 | [diff] [blame] | 97 | while (sta) { |
| 98 | if (compare_ether_addr(sta->addr, addr) == 0) |
| 99 | break; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 100 | sta = rcu_dereference(sta->hnext); |
Johannes Berg | 43ba7e9 | 2008-02-21 14:09:30 +0100 | [diff] [blame] | 101 | } |
| 102 | return sta; |
| 103 | } |
| 104 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 105 | struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr) |
| 106 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 107 | return __sta_info_find(local, addr); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 108 | } |
| 109 | EXPORT_SYMBOL(sta_info_get); |
| 110 | |
Luis Carlos Cobo | ee38585 | 2008-02-23 15:17:11 +0100 | [diff] [blame] | 111 | struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx, |
| 112 | struct net_device *dev) |
| 113 | { |
| 114 | struct sta_info *sta; |
| 115 | int i = 0; |
| 116 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 117 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
Luis Carlos Cobo | ee38585 | 2008-02-23 15:17:11 +0100 | [diff] [blame] | 118 | if (i < idx) { |
| 119 | ++i; |
| 120 | continue; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 121 | } else if (!dev || dev == sta->sdata->dev) { |
Luis Carlos Cobo | ee38585 | 2008-02-23 15:17:11 +0100 | [diff] [blame] | 122 | return sta; |
| 123 | } |
| 124 | } |
Luis Carlos Cobo | ee38585 | 2008-02-23 15:17:11 +0100 | [diff] [blame] | 125 | |
| 126 | return NULL; |
| 127 | } |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 128 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 129 | void sta_info_destroy(struct sta_info *sta) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 130 | { |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 131 | struct ieee80211_local *local = sta->local; |
| 132 | struct sk_buff *skb; |
Ron Rindjunsky | 07db218 | 2007-12-25 17:00:33 +0200 | [diff] [blame] | 133 | int i; |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 134 | DECLARE_MAC_BUF(mbuf); |
| 135 | |
| 136 | if (!sta) |
| 137 | return; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 138 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 139 | ASSERT_RTNL(); |
| 140 | might_sleep(); |
| 141 | |
| 142 | rate_control_remove_sta_debugfs(sta); |
| 143 | ieee80211_sta_debugfs_remove(sta); |
| 144 | |
| 145 | #ifdef CONFIG_MAC80211_MESH |
| 146 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) |
| 147 | mesh_plink_deactivate(sta); |
| 148 | #endif |
| 149 | |
| 150 | /* |
| 151 | * NOTE: This will call synchronize_rcu() internally to |
| 152 | * make sure no key references can be in use. We rely on |
| 153 | * that here for the mesh code! |
| 154 | */ |
| 155 | ieee80211_key_free(sta->key); |
| 156 | WARN_ON(sta->key); |
| 157 | |
| 158 | #ifdef CONFIG_MAC80211_MESH |
| 159 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) |
| 160 | del_timer_sync(&sta->plink_timer); |
| 161 | #endif |
| 162 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 163 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { |
| 164 | local->total_ps_buffered--; |
| 165 | dev_kfree_skb_any(skb); |
| 166 | } |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 167 | |
| 168 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 169 | dev_kfree_skb_any(skb); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 170 | |
Ron Rindjunsky | fe3bf0f | 2008-01-28 14:07:19 +0200 | [diff] [blame] | 171 | for (i = 0; i < STA_TID_NUM; i++) { |
Ron Rindjunsky | 07db218 | 2007-12-25 17:00:33 +0200 | [diff] [blame] | 172 | del_timer_sync(&sta->ampdu_mlme.tid_rx[i].session_timer); |
Ron Rindjunsky | fe3bf0f | 2008-01-28 14:07:19 +0200 | [diff] [blame] | 173 | del_timer_sync(&sta->ampdu_mlme.tid_tx[i].addba_resp_timer); |
| 174 | } |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 175 | rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv); |
| 176 | rate_control_put(sta->rate_ctrl); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 177 | |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 178 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| 179 | printk(KERN_DEBUG "%s: Destroyed STA %s\n", |
| 180 | wiphy_name(local->hw.wiphy), print_mac(mbuf, sta->addr)); |
| 181 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
| 182 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 183 | kfree(sta); |
| 184 | } |
| 185 | |
| 186 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 187 | /* Caller must hold local->sta_lock */ |
| 188 | static void sta_info_hash_add(struct ieee80211_local *local, |
| 189 | struct sta_info *sta) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 190 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 191 | sta->hnext = local->sta_hash[STA_HASH(sta->addr)]; |
| 192 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->addr)], sta); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 193 | } |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 194 | |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 195 | struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, |
| 196 | u8 *addr, gfp_t gfp) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 197 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 198 | struct ieee80211_local *local = sdata->local; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 199 | struct sta_info *sta; |
Ron Rindjunsky | 16c5f15 | 2007-12-25 17:00:34 +0200 | [diff] [blame] | 200 | int i; |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 201 | DECLARE_MAC_BUF(mbuf); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 202 | |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 203 | sta = kzalloc(sizeof(*sta), gfp); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 204 | if (!sta) |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 205 | return NULL; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 206 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 207 | memcpy(sta->addr, addr, ETH_ALEN); |
| 208 | sta->local = local; |
| 209 | sta->sdata = sdata; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 210 | |
| 211 | sta->rate_ctrl = rate_control_get(local->rate_ctrl); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 212 | sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 213 | gfp); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 214 | if (!sta->rate_ctrl_priv) { |
| 215 | rate_control_put(sta->rate_ctrl); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 216 | kfree(sta); |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 217 | return NULL; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 218 | } |
| 219 | |
Ron Rindjunsky | 16c5f15 | 2007-12-25 17:00:34 +0200 | [diff] [blame] | 220 | spin_lock_init(&sta->ampdu_mlme.ampdu_rx); |
Ron Rindjunsky | fe3bf0f | 2008-01-28 14:07:19 +0200 | [diff] [blame] | 221 | spin_lock_init(&sta->ampdu_mlme.ampdu_tx); |
Ron Rindjunsky | 16c5f15 | 2007-12-25 17:00:34 +0200 | [diff] [blame] | 222 | for (i = 0; i < STA_TID_NUM; i++) { |
| 223 | /* timer_to_tid must be initialized with identity mapping to |
| 224 | * enable session_timer's data differentiation. refer to |
| 225 | * sta_rx_agg_session_timer_expired for useage */ |
| 226 | sta->timer_to_tid[i] = i; |
Ron Rindjunsky | fe3bf0f | 2008-01-28 14:07:19 +0200 | [diff] [blame] | 227 | /* tid to tx queue: initialize according to HW (0 is valid) */ |
| 228 | sta->tid_to_tx_q[i] = local->hw.queues; |
Ron Rindjunsky | 16c5f15 | 2007-12-25 17:00:34 +0200 | [diff] [blame] | 229 | /* rx timers */ |
| 230 | sta->ampdu_mlme.tid_rx[i].session_timer.function = |
| 231 | sta_rx_agg_session_timer_expired; |
| 232 | sta->ampdu_mlme.tid_rx[i].session_timer.data = |
| 233 | (unsigned long)&sta->timer_to_tid[i]; |
| 234 | init_timer(&sta->ampdu_mlme.tid_rx[i].session_timer); |
Ron Rindjunsky | fe3bf0f | 2008-01-28 14:07:19 +0200 | [diff] [blame] | 235 | /* tx timers */ |
| 236 | sta->ampdu_mlme.tid_tx[i].addba_resp_timer.function = |
| 237 | sta_addba_resp_timer_expired; |
| 238 | sta->ampdu_mlme.tid_tx[i].addba_resp_timer.data = |
| 239 | (unsigned long)&sta->timer_to_tid[i]; |
| 240 | init_timer(&sta->ampdu_mlme.tid_tx[i].addba_resp_timer); |
Ron Rindjunsky | 16c5f15 | 2007-12-25 17:00:34 +0200 | [diff] [blame] | 241 | } |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 242 | skb_queue_head_init(&sta->ps_tx_buf); |
| 243 | skb_queue_head_init(&sta->tx_filtered); |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 244 | |
| 245 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| 246 | printk(KERN_DEBUG "%s: Allocated STA %s\n", |
| 247 | wiphy_name(local->hw.wiphy), print_mac(mbuf, sta->addr)); |
| 248 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
| 249 | |
Johannes Berg | 03e4497 | 2008-02-27 09:56:40 +0100 | [diff] [blame] | 250 | #ifdef CONFIG_MAC80211_MESH |
Luis Carlos Cobo | b4e08ea | 2008-02-29 15:46:08 -0800 | [diff] [blame] | 251 | sta->plink_state = PLINK_LISTEN; |
Johannes Berg | 03e4497 | 2008-02-27 09:56:40 +0100 | [diff] [blame] | 252 | spin_lock_init(&sta->plink_lock); |
| 253 | init_timer(&sta->plink_timer); |
| 254 | #endif |
| 255 | |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 256 | return sta; |
| 257 | } |
| 258 | |
| 259 | int sta_info_insert(struct sta_info *sta) |
| 260 | { |
| 261 | struct ieee80211_local *local = sta->local; |
| 262 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 263 | unsigned long flags; |
| 264 | DECLARE_MAC_BUF(mac); |
| 265 | |
Johannes Berg | 03e4497 | 2008-02-27 09:56:40 +0100 | [diff] [blame] | 266 | /* |
| 267 | * Can't be a WARN_ON because it can be triggered through a race: |
| 268 | * something inserts a STA (on one CPU) without holding the RTNL |
| 269 | * and another CPU turns off the net device. |
| 270 | */ |
| 271 | if (unlikely(!netif_running(sdata->dev))) |
| 272 | return -ENETDOWN; |
| 273 | |
| 274 | if (WARN_ON(compare_ether_addr(sta->addr, sdata->dev->dev_addr) == 0)) |
| 275 | return -EINVAL; |
| 276 | |
| 277 | if (WARN_ON(is_multicast_ether_addr(sta->addr))) |
| 278 | return -EINVAL; |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 279 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 280 | spin_lock_irqsave(&local->sta_lock, flags); |
Johannes Berg | 43ba7e9 | 2008-02-21 14:09:30 +0100 | [diff] [blame] | 281 | /* check if STA exists already */ |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 282 | if (__sta_info_find(local, sta->addr)) { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 283 | spin_unlock_irqrestore(&local->sta_lock, flags); |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 284 | return -EEXIST; |
Johannes Berg | 43ba7e9 | 2008-02-21 14:09:30 +0100 | [diff] [blame] | 285 | } |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 286 | list_add(&sta->list, &local->sta_list); |
| 287 | local->num_sta++; |
| 288 | sta_info_hash_add(local, sta); |
Johannes Berg | 32bfd35 | 2007-12-19 01:31:26 +0100 | [diff] [blame] | 289 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 290 | /* notify driver */ |
| 291 | if (local->ops->sta_notify) { |
Johannes Berg | 51fb61e | 2007-12-19 01:31:27 +0100 | [diff] [blame] | 292 | if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN) |
Johannes Berg | 32bfd35 | 2007-12-19 01:31:26 +0100 | [diff] [blame] | 293 | sdata = sdata->u.vlan.ap; |
| 294 | |
| 295 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 296 | STA_NOTIFY_ADD, sta->addr); |
Johannes Berg | 32bfd35 | 2007-12-19 01:31:26 +0100 | [diff] [blame] | 297 | } |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 298 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 299 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 300 | printk(KERN_DEBUG "%s: Inserted STA %s\n", |
| 301 | wiphy_name(local->hw.wiphy), print_mac(mac, sta->addr)); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 302 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
| 303 | |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 304 | spin_unlock_irqrestore(&local->sta_lock, flags); |
| 305 | |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 306 | #ifdef CONFIG_MAC80211_DEBUGFS |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 307 | /* debugfs entry adding might sleep, so schedule process |
| 308 | * context task for adding entry for STAs that do not yet |
| 309 | * have one. */ |
| 310 | queue_work(local->hw.workqueue, &local->sta_debugfs_add); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 311 | #endif |
| 312 | |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 313 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
| 314 | mesh_accept_plinks_update(sdata); |
| 315 | |
| 316 | return 0; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 317 | } |
| 318 | |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 319 | static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid) |
| 320 | { |
| 321 | /* |
| 322 | * This format has been mandated by the IEEE specifications, |
| 323 | * so this line may not be changed to use the __set_bit() format. |
| 324 | */ |
| 325 | bss->tim[aid / 8] |= (1 << (aid % 8)); |
| 326 | } |
| 327 | |
| 328 | static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid) |
| 329 | { |
| 330 | /* |
| 331 | * This format has been mandated by the IEEE specifications, |
| 332 | * so this line may not be changed to use the __clear_bit() format. |
| 333 | */ |
| 334 | bss->tim[aid / 8] &= ~(1 << (aid % 8)); |
| 335 | } |
| 336 | |
| 337 | static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss, |
| 338 | struct sta_info *sta) |
| 339 | { |
| 340 | if (bss) |
| 341 | __bss_tim_set(bss, sta->aid); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 342 | if (sta->local->ops->set_tim) { |
| 343 | sta->local->tim_in_locked_section = true; |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 344 | sta->local->ops->set_tim(local_to_hw(sta->local), sta->aid, 1); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 345 | sta->local->tim_in_locked_section = false; |
| 346 | } |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 347 | } |
| 348 | |
| 349 | void sta_info_set_tim_bit(struct sta_info *sta) |
| 350 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 351 | unsigned long flags; |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 352 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 353 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
| 354 | __sta_info_set_tim_bit(sta->sdata->bss, sta); |
| 355 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss, |
| 359 | struct sta_info *sta) |
| 360 | { |
| 361 | if (bss) |
| 362 | __bss_tim_clear(bss, sta->aid); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 363 | if (sta->local->ops->set_tim) { |
| 364 | sta->local->tim_in_locked_section = true; |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 365 | sta->local->ops->set_tim(local_to_hw(sta->local), sta->aid, 0); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 366 | sta->local->tim_in_locked_section = false; |
| 367 | } |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 368 | } |
| 369 | |
| 370 | void sta_info_clear_tim_bit(struct sta_info *sta) |
| 371 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 372 | unsigned long flags; |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 373 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 374 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
| 375 | __sta_info_clear_tim_bit(sta->sdata->bss, sta); |
| 376 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 377 | } |
| 378 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 379 | /* |
| 380 | * See comment in __sta_info_unlink, |
| 381 | * caller must hold local->sta_lock. |
| 382 | */ |
| 383 | static void __sta_info_pin(struct sta_info *sta) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 384 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 385 | WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_NORMAL); |
| 386 | sta->pin_status = STA_INFO_PIN_STAT_PINNED; |
| 387 | } |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 388 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 389 | /* |
| 390 | * See comment in __sta_info_unlink, returns sta if it |
| 391 | * needs to be destroyed. |
| 392 | */ |
| 393 | static struct sta_info *__sta_info_unpin(struct sta_info *sta) |
| 394 | { |
| 395 | struct sta_info *ret = NULL; |
| 396 | unsigned long flags; |
| 397 | |
| 398 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
| 399 | WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_DESTROY && |
| 400 | sta->pin_status != STA_INFO_PIN_STAT_PINNED); |
| 401 | if (sta->pin_status == STA_INFO_PIN_STAT_DESTROY) |
| 402 | ret = sta; |
| 403 | sta->pin_status = STA_INFO_PIN_STAT_NORMAL; |
| 404 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); |
| 405 | |
| 406 | return ret; |
| 407 | } |
| 408 | |
| 409 | static void __sta_info_unlink(struct sta_info **sta) |
| 410 | { |
| 411 | struct ieee80211_local *local = (*sta)->local; |
| 412 | struct ieee80211_sub_if_data *sdata = (*sta)->sdata; |
| 413 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| 414 | DECLARE_MAC_BUF(mbuf); |
| 415 | #endif |
| 416 | /* |
| 417 | * pull caller's reference if we're already gone. |
| 418 | */ |
| 419 | if (sta_info_hash_del(local, *sta)) { |
| 420 | *sta = NULL; |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 421 | return; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 422 | } |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 423 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 424 | /* |
| 425 | * Also pull caller's reference if the STA is pinned by the |
| 426 | * task that is adding the debugfs entries. In that case, we |
| 427 | * leave the STA "to be freed". |
| 428 | * |
| 429 | * The rules are not trivial, but not too complex either: |
| 430 | * (1) pin_status is only modified under the sta_lock |
| 431 | * (2) sta_info_debugfs_add_work() will set the status |
| 432 | * to PINNED when it found an item that needs a new |
| 433 | * debugfs directory created. In that case, that item |
| 434 | * must not be freed although all *RCU* users are done |
| 435 | * with it. Hence, we tell the caller of _unlink() |
| 436 | * that the item is already gone (as can happen when |
| 437 | * two tasks try to unlink/destroy at the same time) |
| 438 | * (3) We set the pin_status to DESTROY here when we |
| 439 | * find such an item. |
| 440 | * (4) sta_info_debugfs_add_work() will reset the pin_status |
| 441 | * from PINNED to NORMAL when it is done with the item, |
| 442 | * but will check for DESTROY before resetting it in |
| 443 | * which case it will free the item. |
| 444 | */ |
| 445 | if ((*sta)->pin_status == STA_INFO_PIN_STAT_PINNED) { |
| 446 | (*sta)->pin_status = STA_INFO_PIN_STAT_DESTROY; |
| 447 | *sta = NULL; |
| 448 | return; |
| 449 | } |
| 450 | |
| 451 | list_del(&(*sta)->list); |
| 452 | |
| 453 | if ((*sta)->flags & WLAN_STA_PS) { |
| 454 | (*sta)->flags &= ~WLAN_STA_PS; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 455 | if (sdata->bss) |
| 456 | atomic_dec(&sdata->bss->num_sta_ps); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 457 | __sta_info_clear_tim_bit(sdata->bss, *sta); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 458 | } |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 459 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 460 | local->num_sta--; |
Luis Carlos Cobo | ee38585 | 2008-02-23 15:17:11 +0100 | [diff] [blame] | 461 | |
Johannes Berg | 32bfd35 | 2007-12-19 01:31:26 +0100 | [diff] [blame] | 462 | if (local->ops->sta_notify) { |
Johannes Berg | 51fb61e | 2007-12-19 01:31:27 +0100 | [diff] [blame] | 463 | if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN) |
Johannes Berg | 32bfd35 | 2007-12-19 01:31:26 +0100 | [diff] [blame] | 464 | sdata = sdata->u.vlan.ap; |
| 465 | |
| 466 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 467 | STA_NOTIFY_REMOVE, (*sta)->addr); |
Johannes Berg | 32bfd35 | 2007-12-19 01:31:26 +0100 | [diff] [blame] | 468 | } |
Tomas Winkler | 478f8d2 | 2007-09-30 13:52:37 +0200 | [diff] [blame] | 469 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 470 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
| 471 | mesh_accept_plinks_update(sdata); |
| 472 | #ifdef CONFIG_MAC80211_MESH |
| 473 | del_timer(&(*sta)->plink_timer); |
| 474 | #endif |
| 475 | } |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 476 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 477 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| 478 | printk(KERN_DEBUG "%s: Removed STA %s\n", |
| 479 | wiphy_name(local->hw.wiphy), print_mac(mbuf, (*sta)->addr)); |
| 480 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 481 | } |
| 482 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 483 | void sta_info_unlink(struct sta_info **sta) |
| 484 | { |
| 485 | struct ieee80211_local *local = (*sta)->local; |
| 486 | unsigned long flags; |
| 487 | |
| 488 | spin_lock_irqsave(&local->sta_lock, flags); |
| 489 | __sta_info_unlink(sta); |
| 490 | spin_unlock_irqrestore(&local->sta_lock, flags); |
| 491 | } |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 492 | |
| 493 | static inline int sta_info_buffer_expired(struct ieee80211_local *local, |
| 494 | struct sta_info *sta, |
| 495 | struct sk_buff *skb) |
| 496 | { |
| 497 | struct ieee80211_tx_packet_data *pkt_data; |
| 498 | int timeout; |
| 499 | |
| 500 | if (!skb) |
| 501 | return 0; |
| 502 | |
| 503 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; |
| 504 | |
| 505 | /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ |
| 506 | timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 / |
| 507 | 15625) * HZ; |
| 508 | if (timeout < STA_TX_BUFFER_EXPIRE) |
| 509 | timeout = STA_TX_BUFFER_EXPIRE; |
| 510 | return time_after(jiffies, pkt_data->jiffies + timeout); |
| 511 | } |
| 512 | |
| 513 | |
| 514 | static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local, |
| 515 | struct sta_info *sta) |
| 516 | { |
| 517 | unsigned long flags; |
| 518 | struct sk_buff *skb; |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 519 | struct ieee80211_sub_if_data *sdata; |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 520 | DECLARE_MAC_BUF(mac); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 521 | |
| 522 | if (skb_queue_empty(&sta->ps_tx_buf)) |
| 523 | return; |
| 524 | |
| 525 | for (;;) { |
| 526 | spin_lock_irqsave(&sta->ps_tx_buf.lock, flags); |
| 527 | skb = skb_peek(&sta->ps_tx_buf); |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 528 | if (sta_info_buffer_expired(local, sta, skb)) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 529 | skb = __skb_dequeue(&sta->ps_tx_buf); |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 530 | else |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 531 | skb = NULL; |
| 532 | spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags); |
| 533 | |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 534 | if (!skb) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 535 | break; |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 536 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 537 | sdata = sta->sdata; |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 538 | local->total_ps_buffered--; |
| 539 | printk(KERN_DEBUG "Buffered frame expired (STA " |
| 540 | "%s)\n", print_mac(mac, sta->addr)); |
| 541 | dev_kfree_skb(skb); |
| 542 | |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 543 | if (skb_queue_empty(&sta->ps_tx_buf)) |
| 544 | sta_info_clear_tim_bit(sta); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 545 | } |
| 546 | } |
| 547 | |
| 548 | |
| 549 | static void sta_info_cleanup(unsigned long data) |
| 550 | { |
| 551 | struct ieee80211_local *local = (struct ieee80211_local *) data; |
| 552 | struct sta_info *sta; |
| 553 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 554 | rcu_read_lock(); |
| 555 | list_for_each_entry_rcu(sta, &local->sta_list, list) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 556 | sta_info_cleanup_expire_buffered(local, sta); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 557 | rcu_read_unlock(); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 558 | |
Johannes Berg | 0d17440 | 2007-12-17 15:07:43 +0100 | [diff] [blame] | 559 | local->sta_cleanup.expires = |
| 560 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 561 | add_timer(&local->sta_cleanup); |
| 562 | } |
| 563 | |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 564 | #ifdef CONFIG_MAC80211_DEBUGFS |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 565 | static void sta_info_debugfs_add_work(struct work_struct *work) |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 566 | { |
| 567 | struct ieee80211_local *local = |
| 568 | container_of(work, struct ieee80211_local, sta_debugfs_add); |
| 569 | struct sta_info *sta, *tmp; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 570 | unsigned long flags; |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 571 | |
| 572 | while (1) { |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 573 | sta = NULL; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 574 | |
| 575 | spin_lock_irqsave(&local->sta_lock, flags); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 576 | list_for_each_entry(tmp, &local->sta_list, list) { |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 577 | if (!tmp->debugfs.dir) { |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 578 | sta = tmp; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 579 | __sta_info_pin(sta); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 580 | break; |
| 581 | } |
| 582 | } |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 583 | spin_unlock_irqrestore(&local->sta_lock, flags); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 584 | |
| 585 | if (!sta) |
| 586 | break; |
| 587 | |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 588 | ieee80211_sta_debugfs_add(sta); |
| 589 | rate_control_add_sta_debugfs(sta); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 590 | |
| 591 | sta = __sta_info_unpin(sta); |
| 592 | |
| 593 | if (sta) { |
| 594 | synchronize_rcu(); |
| 595 | sta_info_destroy(sta); |
| 596 | } |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 597 | } |
| 598 | } |
| 599 | #endif |
| 600 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 601 | void sta_info_init(struct ieee80211_local *local) |
| 602 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 603 | spin_lock_init(&local->sta_lock); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 604 | INIT_LIST_HEAD(&local->sta_list); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 605 | |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 606 | setup_timer(&local->sta_cleanup, sta_info_cleanup, |
| 607 | (unsigned long)local); |
Johannes Berg | 0d17440 | 2007-12-17 15:07:43 +0100 | [diff] [blame] | 608 | local->sta_cleanup.expires = |
| 609 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 610 | |
| 611 | #ifdef CONFIG_MAC80211_DEBUGFS |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 612 | INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_work); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 613 | #endif |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 614 | } |
| 615 | |
| 616 | int sta_info_start(struct ieee80211_local *local) |
| 617 | { |
| 618 | add_timer(&local->sta_cleanup); |
| 619 | return 0; |
| 620 | } |
| 621 | |
| 622 | void sta_info_stop(struct ieee80211_local *local) |
| 623 | { |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 624 | del_timer(&local->sta_cleanup); |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 625 | sta_info_flush(local, NULL); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 626 | } |
| 627 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 628 | /** |
| 629 | * sta_info_flush - flush matching STA entries from the STA table |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 630 | * |
| 631 | * Returns the number of removed STA entries. |
| 632 | * |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 633 | * @local: local interface data |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 634 | * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 635 | */ |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 636 | int sta_info_flush(struct ieee80211_local *local, |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 637 | struct ieee80211_sub_if_data *sdata) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 638 | { |
| 639 | struct sta_info *sta, *tmp; |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 640 | LIST_HEAD(tmp_list); |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 641 | int ret = 0; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 642 | unsigned long flags; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 643 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 644 | might_sleep(); |
| 645 | |
| 646 | spin_lock_irqsave(&local->sta_lock, flags); |
| 647 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { |
| 648 | if (!sdata || sdata == sta->sdata) { |
| 649 | __sta_info_unlink(&sta); |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 650 | if (sta) { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 651 | list_add_tail(&sta->list, &tmp_list); |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 652 | ret++; |
| 653 | } |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 654 | } |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 655 | } |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 656 | spin_unlock_irqrestore(&local->sta_lock, flags); |
| 657 | |
| 658 | synchronize_rcu(); |
| 659 | |
| 660 | list_for_each_entry_safe(sta, tmp, &tmp_list, list) |
| 661 | sta_info_destroy(sta); |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 662 | |
| 663 | return ret; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 664 | } |