Jiri Benc | f0706e82 | 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 | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 19 | |
| 20 | #include <net/mac80211.h> |
| 21 | #include "ieee80211_i.h" |
Johannes Berg | 2c8dccc | 2008-04-08 15:14:40 -0400 | [diff] [blame] | 22 | #include "rate.h" |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 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 | f0706e82 | 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 |
Johannes Berg | 93e5deb | 2008-04-01 15:21:00 +0200 | [diff] [blame] | 39 | * RCU critical section the reference is instantly invalidated. Note that the |
| 40 | * caller may not do much with the STA info before inserting it, in particular, |
| 41 | * it may not start any mesh peer link management or add encryption keys. |
| 42 | * |
| 43 | * When the insertion fails (sta_info_insert()) returns non-zero), the |
| 44 | * structure will have been freed by sta_info_insert()! |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 45 | * |
| 46 | * Because there are debugfs entries for each station, and adding those |
| 47 | * must be able to sleep, it is also possible to "pin" a station entry, |
| 48 | * that means it can be removed from the hash table but not be freed. |
Johannes Berg | 93e5deb | 2008-04-01 15:21:00 +0200 | [diff] [blame] | 49 | * See the comment in __sta_info_unlink() for more information, this is |
| 50 | * an internal capability only. |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 51 | * |
| 52 | * 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] | 53 | * unlink it (sta_info_unlink()) from the list and hash tables and |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 54 | * then destroy it; sta_info_destroy() will wait for an RCU grace period |
| 55 | * to elapse before actually freeing it. Due to the pinning and the |
| 56 | * possibility of multiple callers trying to remove the same STA info at |
| 57 | * the same time, sta_info_unlink() can clear the STA info pointer it is |
| 58 | * passed to indicate that the STA info is owned by somebody else now. |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 59 | * |
Johannes Berg | dbbea67 | 2008-02-26 14:34:06 +0100 | [diff] [blame] | 60 | * 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] | 61 | * the STA info structure now and is responsible of destroying it with |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 62 | * a call to sta_info_destroy(). |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 63 | * |
| 64 | * In all other cases, there is no concept of ownership on a STA entry, |
| 65 | * each structure is owned by the global hash table/list until it is |
| 66 | * removed. All users of the structure need to be RCU protected so that |
| 67 | * the structure won't be freed before they are done using it. |
| 68 | */ |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 69 | |
| 70 | /* Caller must hold local->sta_lock */ |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 71 | static int sta_info_hash_del(struct ieee80211_local *local, |
| 72 | struct sta_info *sta) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 73 | { |
| 74 | struct sta_info *s; |
| 75 | |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 76 | s = local->sta_hash[STA_HASH(sta->sta.addr)]; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 77 | if (!s) |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 78 | return -ENOENT; |
| 79 | if (s == sta) { |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 80 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 81 | s->hnext); |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 82 | return 0; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 83 | } |
| 84 | |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 85 | while (s->hnext && s->hnext != sta) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 86 | s = s->hnext; |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 87 | if (s->hnext) { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 88 | rcu_assign_pointer(s->hnext, sta->hnext); |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 89 | return 0; |
| 90 | } |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 91 | |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 92 | return -ENOENT; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 93 | } |
| 94 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 95 | /* protected by RCU */ |
Johannes Berg | 4b7679a | 2008-09-18 18:14:18 +0200 | [diff] [blame] | 96 | struct sta_info *sta_info_get(struct ieee80211_local *local, const u8 *addr) |
Johannes Berg | 43ba7e9 | 2008-02-21 14:09:30 +0100 | [diff] [blame] | 97 | { |
| 98 | struct sta_info *sta; |
| 99 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 100 | sta = rcu_dereference(local->sta_hash[STA_HASH(addr)]); |
Johannes Berg | 43ba7e9 | 2008-02-21 14:09:30 +0100 | [diff] [blame] | 101 | while (sta) { |
Shaddy Baddah | 5cf12e8 | 2008-11-28 17:08:10 +1100 | [diff] [blame] | 102 | if (memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) |
Johannes Berg | 43ba7e9 | 2008-02-21 14:09:30 +0100 | [diff] [blame] | 103 | break; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 104 | sta = rcu_dereference(sta->hnext); |
Johannes Berg | 43ba7e9 | 2008-02-21 14:09:30 +0100 | [diff] [blame] | 105 | } |
| 106 | return sta; |
| 107 | } |
| 108 | |
Luis Carlos Cobo | ee38585 | 2008-02-23 15:17:11 +0100 | [diff] [blame] | 109 | struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx, |
| 110 | struct net_device *dev) |
| 111 | { |
| 112 | struct sta_info *sta; |
| 113 | int i = 0; |
| 114 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 115 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
Luis Carlos Cobo | 2a8ca29 | 2008-02-29 17:51:25 -0800 | [diff] [blame] | 116 | if (dev && dev != sta->sdata->dev) |
| 117 | continue; |
Luis Carlos Cobo | ee38585 | 2008-02-23 15:17:11 +0100 | [diff] [blame] | 118 | if (i < idx) { |
| 119 | ++i; |
| 120 | continue; |
Luis Carlos Cobo | ee38585 | 2008-02-23 15:17:11 +0100 | [diff] [blame] | 121 | } |
Luis Carlos Cobo | 2a8ca29 | 2008-02-29 17:51:25 -0800 | [diff] [blame] | 122 | return sta; |
Luis Carlos Cobo | ee38585 | 2008-02-23 15:17:11 +0100 | [diff] [blame] | 123 | } |
Luis Carlos Cobo | ee38585 | 2008-02-23 15:17:11 +0100 | [diff] [blame] | 124 | |
| 125 | return NULL; |
| 126 | } |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 127 | |
Johannes Berg | 93e5deb | 2008-04-01 15:21:00 +0200 | [diff] [blame] | 128 | /** |
| 129 | * __sta_info_free - internal STA free helper |
| 130 | * |
Randy Dunlap | 6ef307b | 2008-07-03 13:52:18 -0700 | [diff] [blame] | 131 | * @local: pointer to the global information |
Johannes Berg | 93e5deb | 2008-04-01 15:21:00 +0200 | [diff] [blame] | 132 | * @sta: STA info to free |
| 133 | * |
| 134 | * This function must undo everything done by sta_info_alloc() |
| 135 | * that may happen before sta_info_insert(). |
| 136 | */ |
| 137 | static void __sta_info_free(struct ieee80211_local *local, |
| 138 | struct sta_info *sta) |
| 139 | { |
Johannes Berg | 4b7679a | 2008-09-18 18:14:18 +0200 | [diff] [blame] | 140 | rate_control_free_sta(sta); |
Johannes Berg | 93e5deb | 2008-04-01 15:21:00 +0200 | [diff] [blame] | 141 | rate_control_put(sta->rate_ctrl); |
| 142 | |
| 143 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame] | 144 | printk(KERN_DEBUG "%s: Destroyed STA %pM\n", |
| 145 | wiphy_name(local->hw.wiphy), sta->sta.addr); |
Johannes Berg | 93e5deb | 2008-04-01 15:21:00 +0200 | [diff] [blame] | 146 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
| 147 | |
| 148 | kfree(sta); |
| 149 | } |
| 150 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 151 | void sta_info_destroy(struct sta_info *sta) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 152 | { |
Johannes Berg | 97bff8e | 2008-03-31 19:23:00 +0200 | [diff] [blame] | 153 | struct ieee80211_local *local; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 154 | struct sk_buff *skb; |
Ron Rindjunsky | 07db218 | 2007-12-25 17:00:33 +0200 | [diff] [blame] | 155 | int i; |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 156 | |
Johannes Berg | 97bff8e | 2008-03-31 19:23:00 +0200 | [diff] [blame] | 157 | might_sleep(); |
| 158 | |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 159 | if (!sta) |
| 160 | return; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 161 | |
Johannes Berg | 97bff8e | 2008-03-31 19:23:00 +0200 | [diff] [blame] | 162 | local = sta->local; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 163 | |
| 164 | rate_control_remove_sta_debugfs(sta); |
| 165 | ieee80211_sta_debugfs_remove(sta); |
| 166 | |
| 167 | #ifdef CONFIG_MAC80211_MESH |
| 168 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) |
| 169 | mesh_plink_deactivate(sta); |
| 170 | #endif |
| 171 | |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 172 | /* |
| 173 | * We have only unlinked the key, and actually destroying it |
| 174 | * may mean it is removed from hardware which requires that |
| 175 | * the key->sta pointer is still valid, so flush the key todo |
| 176 | * list here. |
| 177 | * |
| 178 | * ieee80211_key_todo() will synchronize_rcu() so after this |
| 179 | * nothing can reference this sta struct any more. |
| 180 | */ |
| 181 | ieee80211_key_todo(); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 182 | |
| 183 | #ifdef CONFIG_MAC80211_MESH |
| 184 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) |
| 185 | del_timer_sync(&sta->plink_timer); |
| 186 | #endif |
| 187 | |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 188 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { |
| 189 | local->total_ps_buffered--; |
| 190 | dev_kfree_skb_any(skb); |
| 191 | } |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 192 | |
| 193 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 194 | dev_kfree_skb_any(skb); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 195 | |
Ron Rindjunsky | fe3bf0f | 2008-01-28 14:07:19 +0200 | [diff] [blame] | 196 | for (i = 0; i < STA_TID_NUM; i++) { |
Johannes Berg | 07346f81 | 2008-05-03 01:02:02 +0200 | [diff] [blame] | 197 | spin_lock_bh(&sta->lock); |
Ron Rindjunsky | cee24a3 | 2008-03-26 20:36:03 +0200 | [diff] [blame] | 198 | if (sta->ampdu_mlme.tid_rx[i]) |
| 199 | del_timer_sync(&sta->ampdu_mlme.tid_rx[i]->session_timer); |
Ron Rindjunsky | cee24a3 | 2008-03-26 20:36:03 +0200 | [diff] [blame] | 200 | if (sta->ampdu_mlme.tid_tx[i]) |
| 201 | del_timer_sync(&sta->ampdu_mlme.tid_tx[i]->addba_resp_timer); |
Johannes Berg | 07346f81 | 2008-05-03 01:02:02 +0200 | [diff] [blame] | 202 | spin_unlock_bh(&sta->lock); |
Ron Rindjunsky | fe3bf0f | 2008-01-28 14:07:19 +0200 | [diff] [blame] | 203 | } |
Ron Rindjunsky | cee24a3 | 2008-03-26 20:36:03 +0200 | [diff] [blame] | 204 | |
Johannes Berg | 93e5deb | 2008-04-01 15:21:00 +0200 | [diff] [blame] | 205 | __sta_info_free(local, sta); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 206 | } |
| 207 | |
| 208 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 209 | /* Caller must hold local->sta_lock */ |
| 210 | static void sta_info_hash_add(struct ieee80211_local *local, |
| 211 | struct sta_info *sta) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 212 | { |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 213 | sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)]; |
| 214 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 215 | } |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 216 | |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 217 | struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, |
| 218 | u8 *addr, gfp_t gfp) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 219 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 220 | struct ieee80211_local *local = sdata->local; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 221 | struct sta_info *sta; |
Ron Rindjunsky | 16c5f15 | 2007-12-25 17:00:34 +0200 | [diff] [blame] | 222 | int i; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 223 | |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 224 | sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 225 | if (!sta) |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 226 | return NULL; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 227 | |
Johannes Berg | 07346f81 | 2008-05-03 01:02:02 +0200 | [diff] [blame] | 228 | spin_lock_init(&sta->lock); |
Johannes Berg | 5a9f7b0 | 2008-06-18 14:58:09 +0200 | [diff] [blame] | 229 | spin_lock_init(&sta->flaglock); |
Johannes Berg | 07346f81 | 2008-05-03 01:02:02 +0200 | [diff] [blame] | 230 | |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 231 | memcpy(sta->sta.addr, addr, ETH_ALEN); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 232 | sta->local = local; |
| 233 | sta->sdata = sdata; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 234 | |
| 235 | sta->rate_ctrl = rate_control_get(local->rate_ctrl); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 236 | sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, |
Johannes Berg | 4b7679a | 2008-09-18 18:14:18 +0200 | [diff] [blame] | 237 | &sta->sta, gfp); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 238 | if (!sta->rate_ctrl_priv) { |
| 239 | rate_control_put(sta->rate_ctrl); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 240 | kfree(sta); |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 241 | return NULL; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 242 | } |
| 243 | |
Ron Rindjunsky | 16c5f15 | 2007-12-25 17:00:34 +0200 | [diff] [blame] | 244 | for (i = 0; i < STA_TID_NUM; i++) { |
| 245 | /* timer_to_tid must be initialized with identity mapping to |
| 246 | * enable session_timer's data differentiation. refer to |
| 247 | * sta_rx_agg_session_timer_expired for useage */ |
| 248 | sta->timer_to_tid[i] = i; |
Ron Rindjunsky | fe3bf0f | 2008-01-28 14:07:19 +0200 | [diff] [blame] | 249 | /* tid to tx queue: initialize according to HW (0 is valid) */ |
Johannes Berg | e253008 | 2008-05-17 00:57:14 +0200 | [diff] [blame] | 250 | sta->tid_to_tx_q[i] = ieee80211_num_queues(&local->hw); |
Ron Rindjunsky | cee24a3 | 2008-03-26 20:36:03 +0200 | [diff] [blame] | 251 | /* rx */ |
| 252 | sta->ampdu_mlme.tid_state_rx[i] = HT_AGG_STATE_IDLE; |
| 253 | sta->ampdu_mlme.tid_rx[i] = NULL; |
| 254 | /* tx */ |
| 255 | sta->ampdu_mlme.tid_state_tx[i] = HT_AGG_STATE_IDLE; |
| 256 | sta->ampdu_mlme.tid_tx[i] = NULL; |
| 257 | sta->ampdu_mlme.addba_req_num[i] = 0; |
Ron Rindjunsky | 16c5f15 | 2007-12-25 17:00:34 +0200 | [diff] [blame] | 258 | } |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 259 | skb_queue_head_init(&sta->ps_tx_buf); |
| 260 | skb_queue_head_init(&sta->tx_filtered); |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 261 | |
| 262 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame] | 263 | printk(KERN_DEBUG "%s: Allocated STA %pM\n", |
| 264 | wiphy_name(local->hw.wiphy), sta->sta.addr); |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 265 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
| 266 | |
Johannes Berg | 03e4497 | 2008-02-27 09:56:40 +0100 | [diff] [blame] | 267 | #ifdef CONFIG_MAC80211_MESH |
Luis Carlos Cobo | b4e08ea | 2008-02-29 15:46:08 -0800 | [diff] [blame] | 268 | sta->plink_state = PLINK_LISTEN; |
Johannes Berg | 03e4497 | 2008-02-27 09:56:40 +0100 | [diff] [blame] | 269 | init_timer(&sta->plink_timer); |
| 270 | #endif |
| 271 | |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 272 | return sta; |
| 273 | } |
| 274 | |
| 275 | int sta_info_insert(struct sta_info *sta) |
| 276 | { |
| 277 | struct ieee80211_local *local = sta->local; |
| 278 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 279 | unsigned long flags; |
Johannes Berg | 93e5deb | 2008-04-01 15:21:00 +0200 | [diff] [blame] | 280 | int err = 0; |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 281 | |
Johannes Berg | 03e4497 | 2008-02-27 09:56:40 +0100 | [diff] [blame] | 282 | /* |
| 283 | * Can't be a WARN_ON because it can be triggered through a race: |
| 284 | * something inserts a STA (on one CPU) without holding the RTNL |
| 285 | * and another CPU turns off the net device. |
| 286 | */ |
Johannes Berg | 93e5deb | 2008-04-01 15:21:00 +0200 | [diff] [blame] | 287 | if (unlikely(!netif_running(sdata->dev))) { |
| 288 | err = -ENETDOWN; |
| 289 | goto out_free; |
| 290 | } |
Johannes Berg | 03e4497 | 2008-02-27 09:56:40 +0100 | [diff] [blame] | 291 | |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 292 | if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->dev->dev_addr) == 0 || |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 293 | is_multicast_ether_addr(sta->sta.addr))) { |
Johannes Berg | 93e5deb | 2008-04-01 15:21:00 +0200 | [diff] [blame] | 294 | err = -EINVAL; |
| 295 | goto out_free; |
| 296 | } |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 297 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 298 | spin_lock_irqsave(&local->sta_lock, flags); |
Johannes Berg | 43ba7e9 | 2008-02-21 14:09:30 +0100 | [diff] [blame] | 299 | /* check if STA exists already */ |
Johannes Berg | 4b7679a | 2008-09-18 18:14:18 +0200 | [diff] [blame] | 300 | if (sta_info_get(local, sta->sta.addr)) { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 301 | spin_unlock_irqrestore(&local->sta_lock, flags); |
Johannes Berg | 93e5deb | 2008-04-01 15:21:00 +0200 | [diff] [blame] | 302 | err = -EEXIST; |
| 303 | goto out_free; |
Johannes Berg | 43ba7e9 | 2008-02-21 14:09:30 +0100 | [diff] [blame] | 304 | } |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 305 | list_add(&sta->list, &local->sta_list); |
| 306 | local->num_sta++; |
| 307 | sta_info_hash_add(local, sta); |
Johannes Berg | 32bfd35 | 2007-12-19 01:31:26 +0100 | [diff] [blame] | 308 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 309 | /* notify driver */ |
| 310 | if (local->ops->sta_notify) { |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 311 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
Johannes Berg | 3e122be | 2008-07-09 14:40:34 +0200 | [diff] [blame] | 312 | sdata = container_of(sdata->bss, |
| 313 | struct ieee80211_sub_if_data, |
| 314 | u.ap); |
Johannes Berg | 32bfd35 | 2007-12-19 01:31:26 +0100 | [diff] [blame] | 315 | |
| 316 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 317 | STA_NOTIFY_ADD, &sta->sta); |
Johannes Berg | 32bfd35 | 2007-12-19 01:31:26 +0100 | [diff] [blame] | 318 | } |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 319 | |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 320 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame] | 321 | printk(KERN_DEBUG "%s: Inserted STA %pM\n", |
| 322 | wiphy_name(local->hw.wiphy), sta->sta.addr); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 323 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
| 324 | |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 325 | spin_unlock_irqrestore(&local->sta_lock, flags); |
| 326 | |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 327 | #ifdef CONFIG_MAC80211_DEBUGFS |
Johannes Berg | 93e5deb | 2008-04-01 15:21:00 +0200 | [diff] [blame] | 328 | /* |
| 329 | * Debugfs entry adding might sleep, so schedule process |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 330 | * context task for adding entry for STAs that do not yet |
Johannes Berg | 93e5deb | 2008-04-01 15:21:00 +0200 | [diff] [blame] | 331 | * have one. |
| 332 | * NOTE: due to auto-freeing semantics this may only be done |
| 333 | * if the insertion is successful! |
| 334 | */ |
Johannes Berg | 49ec6fa2 | 2008-04-03 14:31:05 +0200 | [diff] [blame] | 335 | schedule_work(&local->sta_debugfs_add); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 336 | #endif |
| 337 | |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 338 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
| 339 | mesh_accept_plinks_update(sdata); |
| 340 | |
| 341 | return 0; |
Johannes Berg | 93e5deb | 2008-04-01 15:21:00 +0200 | [diff] [blame] | 342 | out_free: |
| 343 | BUG_ON(!err); |
| 344 | __sta_info_free(local, sta); |
| 345 | return err; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 346 | } |
| 347 | |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 348 | static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid) |
| 349 | { |
| 350 | /* |
| 351 | * This format has been mandated by the IEEE specifications, |
| 352 | * so this line may not be changed to use the __set_bit() format. |
| 353 | */ |
| 354 | bss->tim[aid / 8] |= (1 << (aid % 8)); |
| 355 | } |
| 356 | |
| 357 | static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid) |
| 358 | { |
| 359 | /* |
| 360 | * This format has been mandated by the IEEE specifications, |
| 361 | * so this line may not be changed to use the __clear_bit() format. |
| 362 | */ |
| 363 | bss->tim[aid / 8] &= ~(1 << (aid % 8)); |
| 364 | } |
| 365 | |
| 366 | static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss, |
| 367 | struct sta_info *sta) |
| 368 | { |
Johannes Berg | 3e122be | 2008-07-09 14:40:34 +0200 | [diff] [blame] | 369 | BUG_ON(!bss); |
| 370 | |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 371 | __bss_tim_set(bss, sta->sta.aid); |
Johannes Berg | 3e122be | 2008-07-09 14:40:34 +0200 | [diff] [blame] | 372 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 373 | if (sta->local->ops->set_tim) { |
| 374 | sta->local->tim_in_locked_section = true; |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 375 | sta->local->ops->set_tim(local_to_hw(sta->local), |
| 376 | &sta->sta, true); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 377 | sta->local->tim_in_locked_section = false; |
| 378 | } |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 379 | } |
| 380 | |
| 381 | void sta_info_set_tim_bit(struct sta_info *sta) |
| 382 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 383 | unsigned long flags; |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 384 | |
Johannes Berg | 3e122be | 2008-07-09 14:40:34 +0200 | [diff] [blame] | 385 | BUG_ON(!sta->sdata->bss); |
| 386 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 387 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
| 388 | __sta_info_set_tim_bit(sta->sdata->bss, sta); |
| 389 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 390 | } |
| 391 | |
| 392 | static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss, |
| 393 | struct sta_info *sta) |
| 394 | { |
Johannes Berg | 3e122be | 2008-07-09 14:40:34 +0200 | [diff] [blame] | 395 | BUG_ON(!bss); |
| 396 | |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 397 | __bss_tim_clear(bss, sta->sta.aid); |
Johannes Berg | 3e122be | 2008-07-09 14:40:34 +0200 | [diff] [blame] | 398 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 399 | if (sta->local->ops->set_tim) { |
| 400 | sta->local->tim_in_locked_section = true; |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 401 | sta->local->ops->set_tim(local_to_hw(sta->local), |
| 402 | &sta->sta, false); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 403 | sta->local->tim_in_locked_section = false; |
| 404 | } |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 405 | } |
| 406 | |
| 407 | void sta_info_clear_tim_bit(struct sta_info *sta) |
| 408 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 409 | unsigned long flags; |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 410 | |
Johannes Berg | 3e122be | 2008-07-09 14:40:34 +0200 | [diff] [blame] | 411 | BUG_ON(!sta->sdata->bss); |
| 412 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 413 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
| 414 | __sta_info_clear_tim_bit(sta->sdata->bss, sta); |
| 415 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 416 | } |
| 417 | |
Johannes Berg | 24723d1 | 2008-09-11 00:01:46 +0200 | [diff] [blame] | 418 | static void __sta_info_unlink(struct sta_info **sta) |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 419 | { |
| 420 | struct ieee80211_local *local = (*sta)->local; |
| 421 | struct ieee80211_sub_if_data *sdata = (*sta)->sdata; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 422 | /* |
| 423 | * pull caller's reference if we're already gone. |
| 424 | */ |
| 425 | if (sta_info_hash_del(local, *sta)) { |
| 426 | *sta = NULL; |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 427 | return; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 428 | } |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 429 | |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 430 | if ((*sta)->key) { |
| 431 | ieee80211_key_free((*sta)->key); |
| 432 | WARN_ON((*sta)->key); |
| 433 | } |
| 434 | |
Johannes Berg | 7d1559f | 2008-04-08 13:08:20 +0200 | [diff] [blame] | 435 | list_del(&(*sta)->list); |
| 436 | |
Johannes Berg | 07346f81 | 2008-05-03 01:02:02 +0200 | [diff] [blame] | 437 | if (test_and_clear_sta_flags(*sta, WLAN_STA_PS)) { |
Johannes Berg | 3e122be | 2008-07-09 14:40:34 +0200 | [diff] [blame] | 438 | BUG_ON(!sdata->bss); |
| 439 | |
| 440 | atomic_dec(&sdata->bss->num_sta_ps); |
Johannes Berg | 7d1559f | 2008-04-08 13:08:20 +0200 | [diff] [blame] | 441 | __sta_info_clear_tim_bit(sdata->bss, *sta); |
| 442 | } |
| 443 | |
| 444 | local->num_sta--; |
| 445 | |
| 446 | if (local->ops->sta_notify) { |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 447 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
Johannes Berg | 3e122be | 2008-07-09 14:40:34 +0200 | [diff] [blame] | 448 | sdata = container_of(sdata->bss, |
| 449 | struct ieee80211_sub_if_data, |
| 450 | u.ap); |
Johannes Berg | 7d1559f | 2008-04-08 13:08:20 +0200 | [diff] [blame] | 451 | |
| 452 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 453 | STA_NOTIFY_REMOVE, &(*sta)->sta); |
Johannes Berg | 7d1559f | 2008-04-08 13:08:20 +0200 | [diff] [blame] | 454 | } |
| 455 | |
| 456 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
| 457 | mesh_accept_plinks_update(sdata); |
| 458 | #ifdef CONFIG_MAC80211_MESH |
| 459 | del_timer(&(*sta)->plink_timer); |
| 460 | #endif |
| 461 | } |
| 462 | |
| 463 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame] | 464 | printk(KERN_DEBUG "%s: Removed STA %pM\n", |
| 465 | wiphy_name(local->hw.wiphy), (*sta)->sta.addr); |
Johannes Berg | 7d1559f | 2008-04-08 13:08:20 +0200 | [diff] [blame] | 466 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
| 467 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 468 | /* |
Johannes Berg | 7d1559f | 2008-04-08 13:08:20 +0200 | [diff] [blame] | 469 | * Finally, pull caller's reference if the STA is pinned by the |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 470 | * task that is adding the debugfs entries. In that case, we |
| 471 | * leave the STA "to be freed". |
| 472 | * |
| 473 | * The rules are not trivial, but not too complex either: |
| 474 | * (1) pin_status is only modified under the sta_lock |
Johannes Berg | 49ec6fa2 | 2008-04-03 14:31:05 +0200 | [diff] [blame] | 475 | * (2) STAs may only be pinned under the RTNL so that |
| 476 | * sta_info_flush() is guaranteed to actually destroy |
| 477 | * all STAs that are active for a given interface, this |
| 478 | * is required for correctness because otherwise we |
| 479 | * could notify a driver that an interface is going |
| 480 | * away and only after that (!) notify it about a STA |
| 481 | * on that interface going away. |
| 482 | * (3) sta_info_debugfs_add_work() will set the status |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 483 | * to PINNED when it found an item that needs a new |
| 484 | * debugfs directory created. In that case, that item |
| 485 | * must not be freed although all *RCU* users are done |
| 486 | * with it. Hence, we tell the caller of _unlink() |
| 487 | * that the item is already gone (as can happen when |
| 488 | * two tasks try to unlink/destroy at the same time) |
Johannes Berg | 49ec6fa2 | 2008-04-03 14:31:05 +0200 | [diff] [blame] | 489 | * (4) We set the pin_status to DESTROY here when we |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 490 | * find such an item. |
Johannes Berg | 49ec6fa2 | 2008-04-03 14:31:05 +0200 | [diff] [blame] | 491 | * (5) sta_info_debugfs_add_work() will reset the pin_status |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 492 | * from PINNED to NORMAL when it is done with the item, |
| 493 | * but will check for DESTROY before resetting it in |
| 494 | * which case it will free the item. |
| 495 | */ |
| 496 | if ((*sta)->pin_status == STA_INFO_PIN_STAT_PINNED) { |
| 497 | (*sta)->pin_status = STA_INFO_PIN_STAT_DESTROY; |
| 498 | *sta = NULL; |
| 499 | return; |
| 500 | } |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 501 | } |
| 502 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 503 | void sta_info_unlink(struct sta_info **sta) |
| 504 | { |
| 505 | struct ieee80211_local *local = (*sta)->local; |
| 506 | unsigned long flags; |
| 507 | |
| 508 | spin_lock_irqsave(&local->sta_lock, flags); |
| 509 | __sta_info_unlink(sta); |
| 510 | spin_unlock_irqrestore(&local->sta_lock, flags); |
| 511 | } |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 512 | |
| 513 | static inline int sta_info_buffer_expired(struct ieee80211_local *local, |
| 514 | struct sta_info *sta, |
| 515 | struct sk_buff *skb) |
| 516 | { |
Johannes Berg | e039fa4 | 2008-05-15 12:55:29 +0200 | [diff] [blame] | 517 | struct ieee80211_tx_info *info; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 518 | int timeout; |
| 519 | |
| 520 | if (!skb) |
| 521 | return 0; |
| 522 | |
Johannes Berg | e039fa4 | 2008-05-15 12:55:29 +0200 | [diff] [blame] | 523 | info = IEEE80211_SKB_CB(skb); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 524 | |
| 525 | /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ |
| 526 | timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 / |
| 527 | 15625) * HZ; |
| 528 | if (timeout < STA_TX_BUFFER_EXPIRE) |
| 529 | timeout = STA_TX_BUFFER_EXPIRE; |
Johannes Berg | e039fa4 | 2008-05-15 12:55:29 +0200 | [diff] [blame] | 530 | return time_after(jiffies, info->control.jiffies + timeout); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 531 | } |
| 532 | |
| 533 | |
| 534 | static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local, |
| 535 | struct sta_info *sta) |
| 536 | { |
| 537 | unsigned long flags; |
| 538 | struct sk_buff *skb; |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 539 | struct ieee80211_sub_if_data *sdata; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 540 | |
| 541 | if (skb_queue_empty(&sta->ps_tx_buf)) |
| 542 | return; |
| 543 | |
| 544 | for (;;) { |
| 545 | spin_lock_irqsave(&sta->ps_tx_buf.lock, flags); |
| 546 | skb = skb_peek(&sta->ps_tx_buf); |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 547 | if (sta_info_buffer_expired(local, sta, skb)) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 548 | skb = __skb_dequeue(&sta->ps_tx_buf); |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 549 | else |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 550 | skb = NULL; |
| 551 | spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags); |
| 552 | |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 553 | if (!skb) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 554 | break; |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 555 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 556 | sdata = sta->sdata; |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 557 | local->total_ps_buffered--; |
Johannes Berg | f4ea83d | 2008-06-30 15:10:46 +0200 | [diff] [blame] | 558 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame] | 559 | printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n", |
| 560 | sta->sta.addr); |
Johannes Berg | f4ea83d | 2008-06-30 15:10:46 +0200 | [diff] [blame] | 561 | #endif |
Johannes Berg | 836341a | 2008-02-20 02:07:21 +0100 | [diff] [blame] | 562 | dev_kfree_skb(skb); |
| 563 | |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 564 | if (skb_queue_empty(&sta->ps_tx_buf)) |
| 565 | sta_info_clear_tim_bit(sta); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 566 | } |
| 567 | } |
| 568 | |
| 569 | |
| 570 | static void sta_info_cleanup(unsigned long data) |
| 571 | { |
| 572 | struct ieee80211_local *local = (struct ieee80211_local *) data; |
| 573 | struct sta_info *sta; |
| 574 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 575 | rcu_read_lock(); |
| 576 | list_for_each_entry_rcu(sta, &local->sta_list, list) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 577 | sta_info_cleanup_expire_buffered(local, sta); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 578 | rcu_read_unlock(); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 579 | |
Johannes Berg | 0d17440 | 2007-12-17 15:07:43 +0100 | [diff] [blame] | 580 | local->sta_cleanup.expires = |
| 581 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 582 | add_timer(&local->sta_cleanup); |
| 583 | } |
| 584 | |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 585 | #ifdef CONFIG_MAC80211_DEBUGFS |
Jiri Slaby | 4d6141c | 2008-04-07 21:53:49 +0200 | [diff] [blame] | 586 | /* |
| 587 | * See comment in __sta_info_unlink, |
| 588 | * caller must hold local->sta_lock. |
| 589 | */ |
| 590 | static void __sta_info_pin(struct sta_info *sta) |
| 591 | { |
| 592 | WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_NORMAL); |
| 593 | sta->pin_status = STA_INFO_PIN_STAT_PINNED; |
| 594 | } |
| 595 | |
| 596 | /* |
| 597 | * See comment in __sta_info_unlink, returns sta if it |
| 598 | * needs to be destroyed. |
| 599 | */ |
| 600 | static struct sta_info *__sta_info_unpin(struct sta_info *sta) |
| 601 | { |
| 602 | struct sta_info *ret = NULL; |
| 603 | unsigned long flags; |
| 604 | |
| 605 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
| 606 | WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_DESTROY && |
| 607 | sta->pin_status != STA_INFO_PIN_STAT_PINNED); |
| 608 | if (sta->pin_status == STA_INFO_PIN_STAT_DESTROY) |
| 609 | ret = sta; |
| 610 | sta->pin_status = STA_INFO_PIN_STAT_NORMAL; |
| 611 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); |
| 612 | |
| 613 | return ret; |
| 614 | } |
| 615 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 616 | static void sta_info_debugfs_add_work(struct work_struct *work) |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 617 | { |
| 618 | struct ieee80211_local *local = |
| 619 | container_of(work, struct ieee80211_local, sta_debugfs_add); |
| 620 | struct sta_info *sta, *tmp; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 621 | unsigned long flags; |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 622 | |
Johannes Berg | 49ec6fa2 | 2008-04-03 14:31:05 +0200 | [diff] [blame] | 623 | /* We need to keep the RTNL across the whole pinned status. */ |
| 624 | rtnl_lock(); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 625 | while (1) { |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 626 | sta = NULL; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 627 | |
| 628 | spin_lock_irqsave(&local->sta_lock, flags); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 629 | list_for_each_entry(tmp, &local->sta_list, list) { |
Johannes Berg | 63044e9 | 2008-10-07 12:04:29 +0200 | [diff] [blame] | 630 | /* |
| 631 | * debugfs.add_has_run will be set by |
| 632 | * ieee80211_sta_debugfs_add regardless |
| 633 | * of what else it does. |
| 634 | */ |
| 635 | if (!tmp->debugfs.add_has_run) { |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 636 | sta = tmp; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 637 | __sta_info_pin(sta); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 638 | break; |
| 639 | } |
| 640 | } |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 641 | spin_unlock_irqrestore(&local->sta_lock, flags); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 642 | |
| 643 | if (!sta) |
| 644 | break; |
| 645 | |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 646 | ieee80211_sta_debugfs_add(sta); |
| 647 | rate_control_add_sta_debugfs(sta); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 648 | |
| 649 | sta = __sta_info_unpin(sta); |
Johannes Berg | 4f6fab4 | 2008-03-31 19:23:02 +0200 | [diff] [blame] | 650 | sta_info_destroy(sta); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 651 | } |
Johannes Berg | 49ec6fa2 | 2008-04-03 14:31:05 +0200 | [diff] [blame] | 652 | rtnl_unlock(); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 653 | } |
| 654 | #endif |
| 655 | |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 656 | static void __ieee80211_run_pending_flush(struct ieee80211_local *local) |
Johannes Berg | dc6676b | 2008-03-31 19:23:03 +0200 | [diff] [blame] | 657 | { |
| 658 | struct sta_info *sta; |
| 659 | unsigned long flags; |
| 660 | |
| 661 | ASSERT_RTNL(); |
| 662 | |
| 663 | spin_lock_irqsave(&local->sta_lock, flags); |
| 664 | while (!list_empty(&local->sta_flush_list)) { |
| 665 | sta = list_first_entry(&local->sta_flush_list, |
| 666 | struct sta_info, list); |
| 667 | list_del(&sta->list); |
| 668 | spin_unlock_irqrestore(&local->sta_lock, flags); |
| 669 | sta_info_destroy(sta); |
| 670 | spin_lock_irqsave(&local->sta_lock, flags); |
| 671 | } |
| 672 | spin_unlock_irqrestore(&local->sta_lock, flags); |
| 673 | } |
| 674 | |
| 675 | static void ieee80211_sta_flush_work(struct work_struct *work) |
| 676 | { |
| 677 | struct ieee80211_local *local = |
| 678 | container_of(work, struct ieee80211_local, sta_flush_work); |
| 679 | |
| 680 | rtnl_lock(); |
| 681 | __ieee80211_run_pending_flush(local); |
| 682 | rtnl_unlock(); |
| 683 | } |
| 684 | |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 685 | void sta_info_init(struct ieee80211_local *local) |
| 686 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 687 | spin_lock_init(&local->sta_lock); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 688 | INIT_LIST_HEAD(&local->sta_list); |
Johannes Berg | dc6676b | 2008-03-31 19:23:03 +0200 | [diff] [blame] | 689 | INIT_LIST_HEAD(&local->sta_flush_list); |
| 690 | INIT_WORK(&local->sta_flush_work, ieee80211_sta_flush_work); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 691 | |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 692 | setup_timer(&local->sta_cleanup, sta_info_cleanup, |
| 693 | (unsigned long)local); |
Johannes Berg | 0d17440 | 2007-12-17 15:07:43 +0100 | [diff] [blame] | 694 | local->sta_cleanup.expires = |
| 695 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 696 | |
| 697 | #ifdef CONFIG_MAC80211_DEBUGFS |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 698 | INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_work); |
Jiri Benc | e9f207f | 2007-05-05 11:46:38 -0700 | [diff] [blame] | 699 | #endif |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 700 | } |
| 701 | |
| 702 | int sta_info_start(struct ieee80211_local *local) |
| 703 | { |
| 704 | add_timer(&local->sta_cleanup); |
| 705 | return 0; |
| 706 | } |
| 707 | |
| 708 | void sta_info_stop(struct ieee80211_local *local) |
| 709 | { |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 710 | del_timer(&local->sta_cleanup); |
Johannes Berg | dc6676b | 2008-03-31 19:23:03 +0200 | [diff] [blame] | 711 | cancel_work_sync(&local->sta_flush_work); |
Johannes Berg | 49ec6fa2 | 2008-04-03 14:31:05 +0200 | [diff] [blame] | 712 | #ifdef CONFIG_MAC80211_DEBUGFS |
| 713 | /* |
| 714 | * Make sure the debugfs adding work isn't pending after this |
| 715 | * because we're about to be destroyed. It doesn't matter |
| 716 | * whether it ran or not since we're going to flush all STAs |
| 717 | * anyway. |
| 718 | */ |
| 719 | cancel_work_sync(&local->sta_debugfs_add); |
| 720 | #endif |
Johannes Berg | dc6676b | 2008-03-31 19:23:03 +0200 | [diff] [blame] | 721 | |
| 722 | rtnl_lock(); |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 723 | sta_info_flush(local, NULL); |
Johannes Berg | dc6676b | 2008-03-31 19:23:03 +0200 | [diff] [blame] | 724 | __ieee80211_run_pending_flush(local); |
| 725 | rtnl_unlock(); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 726 | } |
| 727 | |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 728 | /** |
| 729 | * sta_info_flush - flush matching STA entries from the STA table |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 730 | * |
| 731 | * Returns the number of removed STA entries. |
| 732 | * |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 733 | * @local: local interface data |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 734 | * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 735 | */ |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 736 | int sta_info_flush(struct ieee80211_local *local, |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 737 | struct ieee80211_sub_if_data *sdata) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 738 | { |
| 739 | struct sta_info *sta, *tmp; |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 740 | LIST_HEAD(tmp_list); |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 741 | int ret = 0; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 742 | unsigned long flags; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 743 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 744 | might_sleep(); |
Johannes Berg | dc6676b | 2008-03-31 19:23:03 +0200 | [diff] [blame] | 745 | ASSERT_RTNL(); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 746 | |
| 747 | spin_lock_irqsave(&local->sta_lock, flags); |
| 748 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { |
| 749 | if (!sdata || sdata == sta->sdata) { |
| 750 | __sta_info_unlink(&sta); |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 751 | if (sta) { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 752 | list_add_tail(&sta->list, &tmp_list); |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 753 | ret++; |
| 754 | } |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 755 | } |
Michael Wu | be8755e | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 756 | } |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 757 | spin_unlock_irqrestore(&local->sta_lock, flags); |
| 758 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 759 | list_for_each_entry_safe(sta, tmp, &tmp_list, list) |
| 760 | sta_info_destroy(sta); |
Johannes Berg | 44213b5 | 2008-02-25 16:27:49 +0100 | [diff] [blame] | 761 | |
| 762 | return ret; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 763 | } |
Johannes Berg | dc6676b | 2008-03-31 19:23:03 +0200 | [diff] [blame] | 764 | |
| 765 | /** |
| 766 | * sta_info_flush_delayed - flush matching STA entries from the STA table |
| 767 | * |
| 768 | * This function unlinks all stations for a given interface and queues |
| 769 | * them for freeing. Note that the workqueue function scheduled here has |
| 770 | * to run before any new keys can be added to the system to avoid set_key() |
| 771 | * callback ordering issues. |
| 772 | * |
| 773 | * @sdata: the interface |
| 774 | */ |
| 775 | void sta_info_flush_delayed(struct ieee80211_sub_if_data *sdata) |
| 776 | { |
| 777 | struct ieee80211_local *local = sdata->local; |
| 778 | struct sta_info *sta, *tmp; |
| 779 | unsigned long flags; |
| 780 | bool work = false; |
| 781 | |
| 782 | spin_lock_irqsave(&local->sta_lock, flags); |
| 783 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { |
| 784 | if (sdata == sta->sdata) { |
| 785 | __sta_info_unlink(&sta); |
| 786 | if (sta) { |
| 787 | list_add_tail(&sta->list, |
| 788 | &local->sta_flush_list); |
| 789 | work = true; |
| 790 | } |
| 791 | } |
| 792 | } |
| 793 | if (work) |
| 794 | schedule_work(&local->sta_flush_work); |
| 795 | spin_unlock_irqrestore(&local->sta_lock, flags); |
| 796 | } |
Johannes Berg | 24723d1 | 2008-09-11 00:01:46 +0200 | [diff] [blame] | 797 | |
| 798 | void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, |
| 799 | unsigned long exp_time) |
| 800 | { |
| 801 | struct ieee80211_local *local = sdata->local; |
| 802 | struct sta_info *sta, *tmp; |
| 803 | LIST_HEAD(tmp_list); |
Johannes Berg | 24723d1 | 2008-09-11 00:01:46 +0200 | [diff] [blame] | 804 | unsigned long flags; |
| 805 | |
| 806 | spin_lock_irqsave(&local->sta_lock, flags); |
| 807 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) |
| 808 | if (time_after(jiffies, sta->last_rx + exp_time)) { |
| 809 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame] | 810 | printk(KERN_DEBUG "%s: expiring inactive STA %pM\n", |
| 811 | sdata->dev->name, sta->sta.addr); |
Johannes Berg | 24723d1 | 2008-09-11 00:01:46 +0200 | [diff] [blame] | 812 | #endif |
| 813 | __sta_info_unlink(&sta); |
| 814 | if (sta) |
| 815 | list_add(&sta->list, &tmp_list); |
| 816 | } |
| 817 | spin_unlock_irqrestore(&local->sta_lock, flags); |
| 818 | |
| 819 | list_for_each_entry_safe(sta, tmp, &tmp_list, list) |
| 820 | sta_info_destroy(sta); |
| 821 | } |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 822 | |
| 823 | struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_hw *hw, |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 824 | const u8 *addr) |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 825 | { |
Johannes Berg | 4b7679a | 2008-09-18 18:14:18 +0200 | [diff] [blame] | 826 | struct sta_info *sta = sta_info_get(hw_to_local(hw), addr); |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 827 | |
| 828 | if (!sta) |
| 829 | return NULL; |
| 830 | return &sta->sta; |
| 831 | } |
| 832 | EXPORT_SYMBOL(ieee80211_find_sta); |