package/d80211/src/ieee80211_iface.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/kernel.h>
  11 #include <linux/if_arp.h>
  12 #include <linux/netdevice.h>
  13 #include <linux/rtnetlink.h>
  14 #include <net/d80211.h>
  15 #include <net/d80211_mgmt.h>
  16 #include "ieee80211_i.h"
  17 #include "sta_info.h"
  18
  19 void ieee80211_if_sdata_init(struct ieee80211_sub_if_data *sdata)
  20 {
  21         int i;
  22
  23         /* Default values for sub-interface parameters */
  24         sdata->drop_unencrypted = 0;
  25         sdata->eapol = 1;
  26         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
  27                 skb_queue_head_init(&sdata->fragments[i].skb_list);
  28 }
  29
  30 static void ieee80211_if_sdata_deinit(struct ieee80211_sub_if_data *sdata)
  31 {
  32         int i;
  33
  34         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
  35                 __skb_queue_purge(&sdata->fragments[i].skb_list);
  36         }
  37 }
  38
  39 /* Must be called with rtnl lock held. */
  40 int ieee80211_if_add(struct net_device *dev, const char *name,
  41                      int format, struct net_device **new_dev)
  42 {
  43         struct net_device *ndev, *tmp_dev;
  44         struct ieee80211_local *local = dev->ieee80211_ptr;
  45         struct ieee80211_sub_if_data *sdata = NULL, *sdata_parent;
  46         int ret;
  47         int i;
  48
  49         ASSERT_RTNL();
  50         ndev = *new_dev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
  51                                        "", ieee80211_if_setup);
  52         if (!ndev)
  53                 return -ENOMEM;
  54
  55         ndev->ieee80211_ptr = local;
  56         if (strlen(name) == 0) {
  57                 i = 0;
  58                 do {
  59                         sprintf(ndev->name, "%s.%d", dev->name, i++);
  60                         tmp_dev = dev_get_by_name(ndev->name);
  61                         if (!tmp_dev)
  62                                 break;
  63                         dev_put(tmp_dev);
  64                 } while (i < 10000);
  65         } else if (format) {
  66                 ret = dev_alloc_name(ndev, name);
  67                 if (ret < 0)
  68                         goto fail;
  69         } else {
  70                 snprintf(ndev->name, IFNAMSIZ, "%s", name);
  71         }
  72
  73         memcpy(ndev->dev_addr, local->hw.perm_addr, ETH_ALEN);
  74         ndev->base_addr = dev->base_addr;
  75         ndev->irq = dev->irq;
  76         ndev->mem_start = dev->mem_start;
  77         ndev->mem_end = dev->mem_end;
  78         ndev->flags = dev->flags & IFF_MULTICAST;
  79         SET_NETDEV_DEV(ndev, local->hw.dev);
  80
  81         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
  82         sdata->type = IEEE80211_IF_TYPE_AP;
  83         sdata->dev = ndev;
  84         sdata->local = local;
  85         sdata_parent = IEEE80211_DEV_TO_SUB_IF(dev);
  86         ieee80211_if_sdata_init(sdata);
  87
  88         ret = register_netdevice(ndev);
  89         if (ret)
  90                 goto fail;
  91         ret = ieee80211_sysfs_add_netdevice(ndev);
  92         if (ret) {
  93                 /* ndev will be freed by ndev->destructor */
  94                 unregister_netdevice(ndev);
  95                 *new_dev = NULL;
  96                 return ret;
  97         }
  98
  99         list_add(&sdata->list, &local->sub_if_list);
 100
 101         return 0;
 102
 103 fail:
 104         free_netdev(ndev);
 105         *new_dev = NULL;
 106         return ret;
 107 }
 108
 109 int ieee80211_if_add_mgmt(struct ieee80211_local *local)
 110 {
 111         struct net_device *ndev;
 112         struct ieee80211_sub_if_data *nsdata;
 113         int ret;
 114
 115         ASSERT_RTNL();
 116
 117         ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data), "",
 118                             ieee80211_if_mgmt_setup);
 119         if (!ndev)
 120                 return -ENOMEM;
 121         ret = dev_alloc_name(ndev, "wmgmt%d");
 122         if (ret < 0)
 123                 goto fail;
 124
 125         ndev->ieee80211_ptr = local;
 126         memcpy(ndev->dev_addr, local->hw.perm_addr, ETH_ALEN);
 127         SET_NETDEV_DEV(ndev, local->hw.dev);
 128
 129         nsdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 130         nsdata->type = IEEE80211_IF_TYPE_MGMT;
 131         nsdata->dev = ndev;
 132         nsdata->local = local;
 133         ieee80211_if_sdata_init(nsdata);
 134
 135         ret = register_netdevice(ndev);
 136         if (ret)
 137                 goto fail;
 138         ret = ieee80211_sysfs_add_netdevice(ndev);
 139         if (ret)
 140                 goto fail_sysfs;
 141         if (local->open_count > 0)
 142                 dev_open(ndev);
 143         local->apdev = ndev;
 144         return 0;
 145
 146 fail_sysfs:
 147         unregister_netdevice(ndev);
 148 fail:
 149         free_netdev(ndev);
 150         return ret;
 151 }
 152
 153 void ieee80211_if_del_mgmt(struct ieee80211_local *local)
 154 {
 155         struct net_device *apdev;
 156
 157         ASSERT_RTNL();
 158         apdev = local->apdev;
 159         ieee80211_sysfs_remove_netdevice(apdev);
 160         local->apdev = NULL;
 161         unregister_netdevice(apdev);
 162 }
 163
 164 void ieee80211_if_set_type(struct net_device *dev, int type)
 165 {
 166         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 167
 168         sdata->type = type;
 169         switch (type) {
 170         case IEEE80211_IF_TYPE_WDS:
 171                 sdata->bss = NULL;
 172                 break;
 173         case IEEE80211_IF_TYPE_VLAN:
 174                 break;
 175         case IEEE80211_IF_TYPE_AP:
 176                 sdata->u.ap.dtim_period = 2;
 177                 sdata->u.ap.force_unicast_rateidx = -1;
 178                 sdata->u.ap.max_ratectrl_rateidx = -1;
 179                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 180                 sdata->bss = &sdata->u.ap;
 181                 break;
 182         case IEEE80211_IF_TYPE_STA:
 183         case IEEE80211_IF_TYPE_IBSS: {
 184                 struct ieee80211_sub_if_data *msdata;
 185                 struct ieee80211_if_sta *ifsta;
 186
 187                 ifsta = &sdata->u.sta;
 188                 INIT_WORK(&ifsta->work, ieee80211_sta_work, dev);
 189
 190                 ifsta->capab = WLAN_CAPABILITY_ESS;
 191                 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
 192                         IEEE80211_AUTH_ALG_SHARED_KEY;
 193                 ifsta->create_ibss = 1;
 194                 ifsta->wmm_enabled = 1;
 195
 196                 msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
 197                 sdata->bss = &msdata->u.ap;
 198                 break;
 199         }
 200         case IEEE80211_IF_TYPE_MNTR:
 201                 dev->type = ARPHRD_IEEE80211_PRISM;
 202                 break;
 203         default:
 204                 printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
 205                        dev->name, __FUNCTION__, type);
 206         }
 207         ieee80211_sysfs_change_if_type(dev);
 208 }
 209
 210 /* Must be called with rtnl lock held. */
 211 void ieee80211_if_reinit(struct net_device *dev)
 212 {
 213         struct ieee80211_local *local = dev->ieee80211_ptr;
 214         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 215         struct sta_info *sta;
 216         int i;
 217
 218         ASSERT_RTNL();
 219         ieee80211_if_sdata_deinit(sdata);
 220         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
 221                 if (!sdata->keys[i])
 222                         continue;
 223 #if 0
 224                 /* The interface is down at the moment, so there is not
 225                  * really much point in disabling the keys at this point. */
 226                 memset(addr, 0xff, ETH_ALEN);
 227                 if (local->ops->set_key)
 228                         local->ops->set_key(dev, DISABLE_KEY, addr,
 229                                            local->keys[i], 0);
 230 #endif
 231                 ieee80211_key_free(sdata->keys[i]);
 232         }
 233
 234         /* Shouldn't be necessary but won't hurt */
 235         ieee80211_if_shutdown(dev);
 236
 237         switch (sdata->type) {
 238         case IEEE80211_IF_TYPE_AP: {
 239                 /* Remove all virtual interfaces that use this BSS
 240                  * as their sdata->bss */
 241                 struct ieee80211_sub_if_data *tsdata, *n;
 242
 243                 list_for_each_entry_safe(tsdata, n, &local->sub_if_list, list) {
 244                         if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
 245                                 printk(KERN_DEBUG "%s: removing virtual "
 246                                        "interface %s because its BSS interface"
 247                                        " is being removed\n",
 248                                        sdata->dev->name, tsdata->dev->name);
 249                                 __ieee80211_if_del(local, tsdata);
 250                         }
 251                 }
 252
 253                 kfree(sdata->u.ap.beacon_head);
 254                 kfree(sdata->u.ap.beacon_tail);
 255                 kfree(sdata->u.ap.generic_elem);
 256
 257                 if (dev != local->mdev) {
 258                         struct sk_buff *skb;
 259                         while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 260                                 local->total_ps_buffered--;
 261                                 dev_kfree_skb(skb);
 262                         }
 263                 }
 264
 265                 break;
 266         }
 267         case IEEE80211_IF_TYPE_WDS:
 268                 sta = sta_info_get(local, sdata->u.wds.remote_addr);
 269                 if (sta) {
 270                         sta_info_put(sta);
 271                         sta_info_free(sta, 0);
 272                 } else {
 273 #ifdef CONFIG_D80211_VERBOSE_DEBUG
 274                         printk(KERN_DEBUG "%s: Someone had deleted my STA "
 275                                "entry for the WDS link\n", dev->name);
 276 #endif /* CONFIG_D80211_VERBOSE_DEBUG */
 277                 }
 278                 break;
 279         case IEEE80211_IF_TYPE_STA:
 280         case IEEE80211_IF_TYPE_IBSS:
 281                 kfree(sdata->u.sta.extra_ie);
 282                 sdata->u.sta.extra_ie = NULL;
 283                 kfree(sdata->u.sta.assocreq_ies);
 284                 sdata->u.sta.assocreq_ies = NULL;
 285                 kfree(sdata->u.sta.assocresp_ies);
 286                 sdata->u.sta.assocresp_ies = NULL;
 287                 if (sdata->u.sta.probe_resp) {
 288                         dev_kfree_skb(sdata->u.sta.probe_resp);
 289                         sdata->u.sta.probe_resp = NULL;
 290                 }
 291
 292                 break;
 293         case IEEE80211_IF_TYPE_MNTR:
 294                 dev->type = ARPHRD_ETHER;
 295                 break;
 296         }
 297
 298         /* remove all STAs that are bound to this virtual interface */
 299         sta_info_flush(local, dev);
 300
 301         memset(&sdata->u, 0, sizeof(sdata->u));
 302         ieee80211_if_sdata_init(sdata);
 303 }
 304
 305 /* Must be called with rtnl lock held. */
 306 void __ieee80211_if_del(struct ieee80211_local *local,
 307                         struct ieee80211_sub_if_data *sdata)
 308 {
 309         struct net_device *dev = sdata->dev;
 310
 311         ieee80211_if_reinit(dev);
 312         list_del(&sdata->list);
 313         ieee80211_sysfs_remove_netdevice(dev);
 314         unregister_netdevice(dev);
 315         /* Except master interface, the net_device will be freed by
 316          * net_device->destructor (i. e. ieee80211_if_free). */
 317 }
 318
 319 /* Must be called with rtnl lock held. */
 320 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
 321 {
 322         struct ieee80211_local *local = dev->ieee80211_ptr;
 323         struct ieee80211_sub_if_data *sdata, *n;
 324
 325         ASSERT_RTNL();
 326
 327         list_for_each_entry_safe(sdata, n, &local->sub_if_list, list) {
 328                 if ((sdata->type == id || id == -1) &&
 329                     strcmp(name, sdata->dev->name) == 0 &&
 330                     sdata->dev != local->mdev) {
 331                         __ieee80211_if_del(local, sdata);
 332                         return 0;
 333                 }
 334         }
 335         return -ENODEV;
 336 }
 337
 338 void ieee80211_if_free(struct net_device *dev)
 339 {
 340         struct ieee80211_local *local = dev->ieee80211_ptr;
 341         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 342
 343         /* local->apdev must be NULL when freeing management interface */
 344         BUG_ON(dev == local->apdev);
 345         ieee80211_if_sdata_deinit(sdata);
 346         free_netdev(dev);
 347 }
 348
 349 /* Must be called with rtnl lock held. */
 350 void ieee80211_if_flush(struct net_device *dev)
 351 {
 352         struct ieee80211_local *local = dev->ieee80211_ptr;
 353         struct ieee80211_sub_if_data *sdata, *n;
 354
 355         ASSERT_RTNL();
 356         list_for_each_entry_safe(sdata, n, &local->sub_if_list, list) {
 357                 __ieee80211_if_del(local, sdata);
 358         }
 359 }
 360
 361 void ieee80211_if_del(struct net_device *dev)
 362 {
 363         struct ieee80211_local *local = dev->ieee80211_ptr;
 364         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 365
 366         rtnl_lock();
 367         if (sdata->type == IEEE80211_IF_TYPE_MGMT)
 368                 ieee80211_if_del_mgmt(local);
 369         else
 370                 __ieee80211_if_del(local, sdata);
 371         rtnl_unlock();
 372 }