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 | 2a8ca29 | 2008-02-29 17:51:25 -0800 | [diff] [blame^] | 118 | if (dev && dev != sta->sdata->dev) |
| 119 | continue; |
Luis Carlos Cobo | ee38585 | 2008-02-23 15:17:11 +0100 | [diff] [blame] | 120 | if (i < idx) { |
| 121 | ++i; |
| 122 | continue; |
Luis Carlos Cobo | ee38585 | 2008-02-23 15:17:11 +0100 | [diff] [blame] | 123 | } |
Luis Carlos Cobo | 2a8ca29 | 2008-02-29 17:51:25 -0800 | [diff] [blame^] | 124 | return sta; |
Luis Carlos Cobo | ee38585 | 2008-02-23 15:17:11 +0100 | [diff] [blame] | 125 | } |
Luis Carlos Cobo | ee38585 | 2008-02-23 15:17:11 +0100 | [diff] [blame] | 126 | |
| 127 | return NULL; |
| 128 | } |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 129 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 130 | void sta_info_destroy(struct sta_info *sta) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 131 | { |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 132 | struct ieee80211_local *local = sta->local; |
| 133 | struct sk_buff *skb; |
Ron Rindjunsky | 07db218 | 2007-12-25 17:00:33 +0200 | [diff] [blame] | 134 | int i; |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 135 | DECLARE_MAC_BUF(mbuf); |
| 136 | |
| 137 | if (!sta) |
| 138 | return; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 139 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 140 | ASSERT_RTNL(); |
| 141 | might_sleep(); |
| 142 | |
| 143 | rate_control_remove_sta_debugfs(sta); |
| 144 | ieee80211_sta_debugfs_remove(sta); |
| 145 | |
| 146 | #ifdef CONFIG_MAC80211_MESH |
| 147 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) |
| 148 | mesh_plink_deactivate(sta); |
| 149 | #endif |
| 150 | |
| 151 | /* |
| 152 | * NOTE: This will call synchronize_rcu() internally to |
| 153 | * make sure no key references can be in use. We rely on |
| 154 | * that here for the mesh code! |
| 155 | */ |
| 156 | ieee80211_key_free(sta->key); |
| 157 | WARN_ON(sta->key); |
| 158 | |
| 159 | #ifdef CONFIG_MAC80211_MESH |
| 160 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) |
| 161 | del_timer_sync(&sta->plink_timer); |
| 162 | #endif |
| 163 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 164 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { |
| 165 | local->total_ps_buffered--; |
| 166 | dev_kfree_skb_any(skb); |
| 167 | } |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 168 | |
| 169 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 170 | dev_kfree_skb_any(skb); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 171 | |
Ron Rindjunsky | fe3bf0f | 2008-01-28 14:07:19 +0200 | [diff] [blame] | 172 | for (i = 0; i < STA_TID_NUM; i++) { |
Ron Rindjunsky | 07db218 | 2007-12-25 17:00:33 +0200 | [diff] [blame] | 173 | del_timer_sync(&sta->ampdu_mlme.tid_rx[i].session_timer); |
Ron Rindjunsky | fe3bf0f | 2008-01-28 14:07:19 +0200 | [diff] [blame] | 174 | del_timer_sync(&sta->ampdu_mlme.tid_tx[i].addba_resp_timer); |
| 175 | } |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 176 | rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv); |
| 177 | rate_control_put(sta->rate_ctrl); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 178 | |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 179 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| 180 | printk(KERN_DEBUG "%s: Destroyed STA %s\n", |
| 181 | wiphy_name(local->hw.wiphy), print_mac(mbuf, sta->addr)); |
| 182 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
| 183 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 184 | kfree(sta); |
| 185 | } |
| 186 | |
| 187 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 188 | /* Caller must hold local->sta_lock */ |
| 189 | static void sta_info_hash_add(struct ieee80211_local *local, |
| 190 | struct sta_info *sta) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 191 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 192 | sta->hnext = local->sta_hash[STA_HASH(sta->addr)]; |
| 193 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->addr)], sta); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 194 | } |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 195 | |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 196 | struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, |
| 197 | u8 *addr, gfp_t gfp) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 198 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 199 | struct ieee80211_local *local = sdata->local; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 200 | struct sta_info *sta; |
Ron Rindjunsky | 16c5f15 | 2007-12-25 17:00:34 +0200 | [diff] [blame] | 201 | int i; |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 202 | DECLARE_MAC_BUF(mbuf); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 203 | |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 204 | sta = kzalloc(sizeof(*sta), gfp); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 205 | if (!sta) |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 206 | return NULL; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 207 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 208 | memcpy(sta->addr, addr, ETH_ALEN); |
| 209 | sta->local = local; |
| 210 | sta->sdata = sdata; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 211 | |
| 212 | sta->rate_ctrl = rate_control_get(local->rate_ctrl); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 213 | sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 214 | gfp); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 215 | if (!sta->rate_ctrl_priv) { |
| 216 | rate_control_put(sta->rate_ctrl); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 217 | kfree(sta); |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 218 | return NULL; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 219 | } |
| 220 | |
Ron Rindjunsky | 16c5f15 | 2007-12-25 17:00:34 +0200 | [diff] [blame] | 221 | spin_lock_init(&sta->ampdu_mlme.ampdu_rx); |
Ron Rindjunsky | fe3bf0f | 2008-01-28 14:07:19 +0200 | [diff] [blame] | 222 | spin_lock_init(&sta->ampdu_mlme.ampdu_tx); |
Ron Rindjunsky | 16c5f15 | 2007-12-25 17:00:34 +0200 | [diff] [blame] | 223 | for (i = 0; i < STA_TID_NUM; i++) { |
| 224 | /* timer_to_tid must be initialized with identity mapping to |
| 225 | * enable session_timer's data differentiation. refer to |
| 226 | * sta_rx_agg_session_timer_expired for useage */ |
| 227 | sta->timer_to_tid[i] = i; |
Ron Rindjunsky | fe3bf0f | 2008-01-28 14:07:19 +0200 | [diff] [blame] | 228 | /* tid to tx queue: initialize according to HW (0 is valid) */ |
| 229 | sta->tid_to_tx_q[i] = local->hw.queues; |
Ron Rindjunsky | 16c5f15 | 2007-12-25 17:00:34 +0200 | [diff] [blame] | 230 | /* rx timers */ |
| 231 | sta->ampdu_mlme.tid_rx[i].session_timer.function = |
| 232 | sta_rx_agg_session_timer_expired; |
| 233 | sta->ampdu_mlme.tid_rx[i].session_timer.data = |
| 234 | (unsigned long)&sta->timer_to_tid[i]; |
| 235 | init_timer(&sta->ampdu_mlme.tid_rx[i].session_timer); |
Ron Rindjunsky | fe3bf0f | 2008-01-28 14:07:19 +0200 | [diff] [blame] | 236 | /* tx timers */ |
| 237 | sta->ampdu_mlme.tid_tx[i].addba_resp_timer.function = |
| 238 | sta_addba_resp_timer_expired; |
| 239 | sta->ampdu_mlme.tid_tx[i].addba_resp_timer.data = |
| 240 | (unsigned long)&sta->timer_to_tid[i]; |
| 241 | init_timer(&sta->ampdu_mlme.tid_tx[i].addba_resp_timer); |
Ron Rindjunsky | 16c5f15 | 2007-12-25 17:00:34 +0200 | [diff] [blame] | 242 | } |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 243 | skb_queue_head_init(&sta->ps_tx_buf); |
| 244 | skb_queue_head_init(&sta->tx_filtered); |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 245 | |
| 246 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| 247 | printk(KERN_DEBUG "%s: Allocated STA %s\n", |
| 248 | wiphy_name(local->hw.wiphy), print_mac(mbuf, sta->addr)); |
| 249 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
| 250 | |
Johannes Berg | 03e4497 | 2008-02-27 09:56:40 +0100 | [diff] [blame] | 251 | #ifdef CONFIG_MAC80211_MESH |
Luis Carlos Cobo | b4e08ea | 2008-02-29 15:46:08 -0800 | [diff] [blame] | 252 | sta->plink_state = PLINK_LISTEN; |
Johannes Berg | 03e4497 | 2008-02-27 09:56:40 +0100 | [diff] [blame] | 253 | spin_lock_init(&sta->plink_lock); |
| 254 | init_timer(&sta->plink_timer); |
| 255 | #endif |
| 256 | |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 257 | return sta; |
| 258 | } |
| 259 | |
| 260 | int sta_info_insert(struct sta_info *sta) |
| 261 | { |
| 262 | struct ieee80211_local *local = sta->local; |
| 263 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 264 | unsigned long flags; |
| 265 | DECLARE_MAC_BUF(mac); |
| 266 | |
Johannes Berg | 03e4497 | 2008-02-27 09:56:40 +0100 | [diff] [blame] | 267 | /* |
| 268 | * Can't be a WARN_ON because it can be triggered through a race: |
| 269 | * something inserts a STA (on one CPU) without holding the RTNL |
| 270 | * and another CPU turns off the net device. |
| 271 | */ |
| 272 | if (unlikely(!netif_running(sdata->dev))) |
| 273 | return -ENETDOWN; |
| 274 | |
| 275 | if (WARN_ON(compare_ether_addr(sta->addr, sdata->dev->dev_addr) == 0)) |
| 276 | return -EINVAL; |
| 277 | |
| 278 | if (WARN_ON(is_multicast_ether_addr(sta->addr))) |
| 279 | return -EINVAL; |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 280 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 281 | spin_lock_irqsave(&local->sta_lock, flags); |
Johannes Berg | 43ba7e9 | 2008-02-21 14:09:30 +0100 | [diff] [blame] | 282 | /* check if STA exists already */ |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 283 | if (__sta_info_find(local, sta->addr)) { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 284 | spin_unlock_irqrestore(&local->sta_lock, flags); |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 285 | return -EEXIST; |
Johannes Berg | 43ba7e9 | 2008-02-21 14:09:30 +0100 | [diff] [blame] | 286 | } |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 287 | list_add(&sta->list, &local->sta_list); |
| 288 | local->num_sta++; |
| 289 | sta_info_hash_add(local, sta); |
Johannes Berg | 32bfd35 | 2007-12-19 01:31:26 +0100 | [diff] [blame] | 290 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 291 | /* notify driver */ |
| 292 | if (local->ops->sta_notify) { |
Johannes Berg | 51fb61e | 2007-12-19 01:31:27 +0100 | [diff] [blame] | 293 | if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN) |
Johannes Berg | 32bfd35 | 2007-12-19 01:31:26 +0100 | [diff] [blame] | 294 | sdata = sdata->u.vlan.ap; |
| 295 | |
| 296 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 297 | STA_NOTIFY_ADD, sta->addr); |
Johannes Berg | 32bfd35 | 2007-12-19 01:31:26 +0100 | [diff] [blame] | 298 | } |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 299 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 300 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 301 | printk(KERN_DEBUG "%s: Inserted STA %s\n", |
| 302 | wiphy_name(local->hw.wiphy), print_mac(mac, sta->addr)); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 303 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
| 304 | |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 305 | spin_unlock_irqrestore(&local->sta_lock, flags); |
| 306 | |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 307 | #ifdef CONFIG_MAC80211_DEBUGFS |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 308 | /* debugfs entry adding might sleep, so schedule process |
| 309 | * context task for adding entry for STAs that do not yet |
| 310 | * have one. */ |
| 311 | queue_work(local->hw.workqueue, &local->sta_debugfs_add); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 312 | #endif |
| 313 | |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 314 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
| 315 | mesh_accept_plinks_update(sdata); |
| 316 | |
| 317 | return 0; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 318 | } |
| 319 | |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 320 | static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid) |
| 321 | { |
| 322 | /* |
| 323 | * This format has been mandated by the IEEE specifications, |
| 324 | * so this line may not be changed to use the __set_bit() format. |
| 325 | */ |
| 326 | bss->tim[aid / 8] |= (1 << (aid % 8)); |
| 327 | } |
| 328 | |
| 329 | static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid) |
| 330 | { |
| 331 | /* |
| 332 | * This format has been mandated by the IEEE specifications, |
| 333 | * so this line may not be changed to use the __clear_bit() format. |
| 334 | */ |
| 335 | bss->tim[aid / 8] &= ~(1 << (aid % 8)); |
| 336 | } |
| 337 | |
| 338 | static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss, |
| 339 | struct sta_info *sta) |
| 340 | { |
| 341 | if (bss) |
| 342 | __bss_tim_set(bss, sta->aid); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 343 | if (sta->local->ops->set_tim) { |
| 344 | sta->local->tim_in_locked_section = true; |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 345 | 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] | 346 | sta->local->tim_in_locked_section = false; |
| 347 | } |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | void sta_info_set_tim_bit(struct sta_info *sta) |
| 351 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 352 | unsigned long flags; |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 353 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 354 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
| 355 | __sta_info_set_tim_bit(sta->sdata->bss, sta); |
| 356 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 357 | } |
| 358 | |
| 359 | static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss, |
| 360 | struct sta_info *sta) |
| 361 | { |
| 362 | if (bss) |
| 363 | __bss_tim_clear(bss, sta->aid); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 364 | if (sta->local->ops->set_tim) { |
| 365 | sta->local->tim_in_locked_section = true; |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 366 | 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] | 367 | sta->local->tim_in_locked_section = false; |
| 368 | } |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 369 | } |
| 370 | |
| 371 | void sta_info_clear_tim_bit(struct sta_info *sta) |
| 372 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 373 | unsigned long flags; |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 374 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 375 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
| 376 | __sta_info_clear_tim_bit(sta->sdata->bss, sta); |
| 377 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 378 | } |
| 379 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 380 | /* |
| 381 | * See comment in __sta_info_unlink, |
| 382 | * caller must hold local->sta_lock. |
| 383 | */ |
| 384 | static void __sta_info_pin(struct sta_info *sta) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 385 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 386 | WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_NORMAL); |
| 387 | sta->pin_status = STA_INFO_PIN_STAT_PINNED; |
| 388 | } |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 389 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 390 | /* |
| 391 | * See comment in __sta_info_unlink, returns sta if it |
| 392 | * needs to be destroyed. |
| 393 | */ |
| 394 | static struct sta_info *__sta_info_unpin(struct sta_info *sta) |
| 395 | { |
| 396 | struct sta_info *ret = NULL; |
| 397 | unsigned long flags; |
| 398 | |
| 399 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
| 400 | WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_DESTROY && |
| 401 | sta->pin_status != STA_INFO_PIN_STAT_PINNED); |
| 402 | if (sta->pin_status == STA_INFO_PIN_STAT_DESTROY) |
| 403 | ret = sta; |
| 404 | sta->pin_status = STA_INFO_PIN_STAT_NORMAL; |
| 405 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); |
| 406 | |
| 407 | return ret; |
| 408 | } |
| 409 | |
| 410 | static void __sta_info_unlink(struct sta_info **sta) |
| 411 | { |
| 412 | struct ieee80211_local *local = (*sta)->local; |
| 413 | struct ieee80211_sub_if_data *sdata = (*sta)->sdata; |
| 414 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| 415 | DECLARE_MAC_BUF(mbuf); |
| 416 | #endif |
| 417 | /* |
| 418 | * pull caller's reference if we're already gone. |
| 419 | */ |
| 420 | if (sta_info_hash_del(local, *sta)) { |
| 421 | *sta = NULL; |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 422 | return; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 423 | } |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 424 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 425 | /* |
| 426 | * Also pull caller's reference if the STA is pinned by the |
| 427 | * task that is adding the debugfs entries. In that case, we |
| 428 | * leave the STA "to be freed". |
| 429 | * |
| 430 | * The rules are not trivial, but not too complex either: |
| 431 | * (1) pin_status is only modified under the sta_lock |
| 432 | * (2) sta_info_debugfs_add_work() will set the status |
| 433 | * to PINNED when it found an item that needs a new |
| 434 | * debugfs directory created. In that case, that item |
| 435 | * must not be freed although all *RCU* users are done |
| 436 | * with it. Hence, we tell the caller of _unlink() |
| 437 | * that the item is already gone (as can happen when |
| 438 | * two tasks try to unlink/destroy at the same time) |
| 439 | * (3) We set the pin_status to DESTROY here when we |
| 440 | * find such an item. |
| 441 | * (4) sta_info_debugfs_add_work() will reset the pin_status |
| 442 | * from PINNED to NORMAL when it is done with the item, |
| 443 | * but will check for DESTROY before resetting it in |
| 444 | * which case it will free the item. |
| 445 | */ |
| 446 | if ((*sta)->pin_status == STA_INFO_PIN_STAT_PINNED) { |
| 447 | (*sta)->pin_status = STA_INFO_PIN_STAT_DESTROY; |
| 448 | *sta = NULL; |
| 449 | return; |
| 450 | } |
| 451 | |
| 452 | list_del(&(*sta)->list); |
| 453 | |
| 454 | if ((*sta)->flags & WLAN_STA_PS) { |
| 455 | (*sta)->flags &= ~WLAN_STA_PS; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 456 | if (sdata->bss) |
| 457 | atomic_dec(&sdata->bss->num_sta_ps); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 458 | __sta_info_clear_tim_bit(sdata->bss, *sta); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 459 | } |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 460 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 461 | local->num_sta--; |
Luis Carlos Cobo | ee38585 | 2008-02-23 15:17:11 +0100 | [diff] [blame] | 462 | |
Johannes Berg | 32bfd35 | 2007-12-19 01:31:26 +0100 | [diff] [blame] | 463 | if (local->ops->sta_notify) { |
Johannes Berg | 51fb61e | 2007-12-19 01:31:27 +0100 | [diff] [blame] | 464 | if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN) |
Johannes Berg | 32bfd35 | 2007-12-19 01:31:26 +0100 | [diff] [blame] | 465 | sdata = sdata->u.vlan.ap; |
| 466 | |
| 467 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 468 | STA_NOTIFY_REMOVE, (*sta)->addr); |
Johannes Berg | 32bfd35 | 2007-12-19 01:31:26 +0100 | [diff] [blame] | 469 | } |
Tomas Winkler | 478f8d2 | 2007-09-30 13:52:37 +0200 | [diff] [blame] | 470 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 471 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
| 472 | mesh_accept_plinks_update(sdata); |
| 473 | #ifdef CONFIG_MAC80211_MESH |
| 474 | del_timer(&(*sta)->plink_timer); |
| 475 | #endif |
| 476 | } |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 477 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 478 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| 479 | printk(KERN_DEBUG "%s: Removed STA %s\n", |
| 480 | wiphy_name(local->hw.wiphy), print_mac(mbuf, (*sta)->addr)); |
| 481 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 482 | } |
| 483 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 484 | void sta_info_unlink(struct sta_info **sta) |
| 485 | { |
| 486 | struct ieee80211_local *local = (*sta)->local; |
| 487 | unsigned long flags; |
| 488 | |
| 489 | spin_lock_irqsave(&local->sta_lock, flags); |
| 490 | __sta_info_unlink(sta); |
| 491 | spin_unlock_irqrestore(&local->sta_lock, flags); |
| 492 | } |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 493 | |
| 494 | static inline int sta_info_buffer_expired(struct ieee80211_local *local, |
| 495 | struct sta_info *sta, |
| 496 | struct sk_buff *skb) |
| 497 | { |
| 498 | struct ieee80211_tx_packet_data *pkt_data; |
| 499 | int timeout; |
| 500 | |
| 501 | if (!skb) |
| 502 | return 0; |
| 503 | |
| 504 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; |
| 505 | |
| 506 | /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ |
| 507 | timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 / |
| 508 | 15625) * HZ; |
| 509 | if (timeout < STA_TX_BUFFER_EXPIRE) |
| 510 | timeout = STA_TX_BUFFER_EXPIRE; |
| 511 | return time_after(jiffies, pkt_data->jiffies + timeout); |
| 512 | } |
| 513 | |
| 514 | |
| 515 | static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local, |
| 516 | struct sta_info *sta) |
| 517 | { |
| 518 | unsigned long flags; |
| 519 | struct sk_buff *skb; |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 520 | struct ieee80211_sub_if_data *sdata; |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 521 | DECLARE_MAC_BUF(mac); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 522 | |
| 523 | if (skb_queue_empty(&sta->ps_tx_buf)) |
| 524 | return; |
| 525 | |
| 526 | for (;;) { |
| 527 | spin_lock_irqsave(&sta->ps_tx_buf.lock, flags); |
| 528 | skb = skb_peek(&sta->ps_tx_buf); |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 529 | if (sta_info_buffer_expired(local, sta, skb)) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 530 | skb = __skb_dequeue(&sta->ps_tx_buf); |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 531 | else |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 532 | skb = NULL; |
| 533 | spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags); |
| 534 | |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 535 | if (!skb) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 536 | break; |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 537 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 538 | sdata = sta->sdata; |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 539 | local->total_ps_buffered--; |
| 540 | printk(KERN_DEBUG "Buffered frame expired (STA " |
| 541 | "%s)\n", print_mac(mac, sta->addr)); |
| 542 | dev_kfree_skb(skb); |
| 543 | |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 544 | if (skb_queue_empty(&sta->ps_tx_buf)) |
| 545 | sta_info_clear_tim_bit(sta); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 546 | } |
| 547 | } |
| 548 | |
| 549 | |
| 550 | static void sta_info_cleanup(unsigned long data) |
| 551 | { |
| 552 | struct ieee80211_local *local = (struct ieee80211_local *) data; |
| 553 | struct sta_info *sta; |
| 554 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 555 | rcu_read_lock(); |
| 556 | list_for_each_entry_rcu(sta, &local->sta_list, list) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 557 | sta_info_cleanup_expire_buffered(local, sta); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 558 | rcu_read_unlock(); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 559 | |
Johannes Berg | 0d17440 | 2007-12-17 15:07:43 +0100 | [diff] [blame] | 560 | local->sta_cleanup.expires = |
| 561 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 562 | add_timer(&local->sta_cleanup); |
| 563 | } |
| 564 | |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 565 | #ifdef CONFIG_MAC80211_DEBUGFS |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 566 | static void sta_info_debugfs_add_work(struct work_struct *work) |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 567 | { |
| 568 | struct ieee80211_local *local = |
| 569 | container_of(work, struct ieee80211_local, sta_debugfs_add); |
| 570 | struct sta_info *sta, *tmp; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 571 | unsigned long flags; |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 572 | |
| 573 | while (1) { |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 574 | sta = NULL; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 575 | |
| 576 | spin_lock_irqsave(&local->sta_lock, flags); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 577 | list_for_each_entry(tmp, &local->sta_list, list) { |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 578 | if (!tmp->debugfs.dir) { |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 579 | sta = tmp; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 580 | __sta_info_pin(sta); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 581 | break; |
| 582 | } |
| 583 | } |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 584 | spin_unlock_irqrestore(&local->sta_lock, flags); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 585 | |
| 586 | if (!sta) |
| 587 | break; |
| 588 | |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 589 | ieee80211_sta_debugfs_add(sta); |
| 590 | rate_control_add_sta_debugfs(sta); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 591 | |
| 592 | sta = __sta_info_unpin(sta); |
| 593 | |
| 594 | if (sta) { |
| 595 | synchronize_rcu(); |
| 596 | sta_info_destroy(sta); |
| 597 | } |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 598 | } |
| 599 | } |
| 600 | #endif |
| 601 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 602 | void sta_info_init(struct ieee80211_local *local) |
| 603 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 604 | spin_lock_init(&local->sta_lock); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 605 | INIT_LIST_HEAD(&local->sta_list); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 606 | |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 607 | setup_timer(&local->sta_cleanup, sta_info_cleanup, |
| 608 | (unsigned long)local); |
Johannes Berg | 0d17440 | 2007-12-17 15:07:43 +0100 | [diff] [blame] | 609 | local->sta_cleanup.expires = |
| 610 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 611 | |
| 612 | #ifdef CONFIG_MAC80211_DEBUGFS |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 613 | INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_work); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 614 | #endif |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 615 | } |
| 616 | |
| 617 | int sta_info_start(struct ieee80211_local *local) |
| 618 | { |
| 619 | add_timer(&local->sta_cleanup); |
| 620 | return 0; |
| 621 | } |
| 622 | |
| 623 | void sta_info_stop(struct ieee80211_local *local) |
| 624 | { |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 625 | del_timer(&local->sta_cleanup); |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 626 | sta_info_flush(local, NULL); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 627 | } |
| 628 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 629 | /** |
| 630 | * sta_info_flush - flush matching STA entries from the STA table |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 631 | * |
| 632 | * Returns the number of removed STA entries. |
| 633 | * |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 634 | * @local: local interface data |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 635 | * @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] | 636 | */ |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 637 | int sta_info_flush(struct ieee80211_local *local, |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 638 | struct ieee80211_sub_if_data *sdata) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 639 | { |
| 640 | struct sta_info *sta, *tmp; |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 641 | LIST_HEAD(tmp_list); |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 642 | int ret = 0; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 643 | unsigned long flags; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 644 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 645 | might_sleep(); |
| 646 | |
| 647 | spin_lock_irqsave(&local->sta_lock, flags); |
| 648 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { |
| 649 | if (!sdata || sdata == sta->sdata) { |
| 650 | __sta_info_unlink(&sta); |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 651 | if (sta) { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 652 | list_add_tail(&sta->list, &tmp_list); |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 653 | ret++; |
| 654 | } |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 655 | } |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 656 | } |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 657 | spin_unlock_irqrestore(&local->sta_lock, flags); |
| 658 | |
| 659 | synchronize_rcu(); |
| 660 | |
| 661 | list_for_each_entry_safe(sta, tmp, &tmp_list, list) |
| 662 | sta_info_destroy(sta); |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 663 | |
| 664 | return ret; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 665 | } |