| /* |
| * Copyright 2002-2005, Instant802 Networks, Inc. |
| * Copyright 2005-2006, Devicescape Software, Inc. |
| * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> |
| * Copyright 2008, Johannes Berg <johannes@sipsolutions.net> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #include <linux/kernel.h> |
| #include <linux/if_arp.h> |
| #include <linux/netdevice.h> |
| #include <linux/rtnetlink.h> |
| #include <net/mac80211.h> |
| #include "ieee80211_i.h" |
| #include "sta_info.h" |
| #include "debugfs_netdev.h" |
| #include "mesh.h" |
| |
| /* |
| * Called when the netdev is removed or, by the code below, before |
| * the interface type changes. |
| */ |
| static void ieee80211_teardown_sdata(struct net_device *dev) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| struct ieee80211_local *local = sdata->local; |
| struct beacon_data *beacon; |
| struct sk_buff *skb; |
| int flushed; |
| int i; |
| |
| /* free extra data */ |
| ieee80211_free_keys(sdata); |
| |
| ieee80211_debugfs_remove_netdev(sdata); |
| |
| for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) |
| __skb_queue_purge(&sdata->fragments[i].skb_list); |
| sdata->fragment_next = 0; |
| |
| switch (sdata->vif.type) { |
| case NL80211_IFTYPE_AP: |
| beacon = sdata->u.ap.beacon; |
| rcu_assign_pointer(sdata->u.ap.beacon, NULL); |
| synchronize_rcu(); |
| kfree(beacon); |
| |
| while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) { |
| local->total_ps_buffered--; |
| dev_kfree_skb(skb); |
| } |
| |
| break; |
| case NL80211_IFTYPE_MESH_POINT: |
| if (ieee80211_vif_is_mesh(&sdata->vif)) |
| mesh_rmc_free(sdata); |
| break; |
| case NL80211_IFTYPE_STATION: |
| case NL80211_IFTYPE_ADHOC: |
| kfree(sdata->u.sta.extra_ie); |
| kfree(sdata->u.sta.assocreq_ies); |
| kfree(sdata->u.sta.assocresp_ies); |
| kfree_skb(sdata->u.sta.probe_resp); |
| break; |
| case NL80211_IFTYPE_WDS: |
| case NL80211_IFTYPE_AP_VLAN: |
| case NL80211_IFTYPE_MONITOR: |
| break; |
| case NL80211_IFTYPE_UNSPECIFIED: |
| case __NL80211_IFTYPE_AFTER_LAST: |
| BUG(); |
| break; |
| } |
| |
| flushed = sta_info_flush(local, sdata); |
| WARN_ON(flushed); |
| } |
| |
| /* |
| * Helper function to initialise an interface to a specific type. |
| */ |
| static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, |
| enum nl80211_iftype type) |
| { |
| /* clear type-dependent union */ |
| memset(&sdata->u, 0, sizeof(sdata->u)); |
| |
| /* and set some type-dependent values */ |
| sdata->vif.type = type; |
| |
| /* only monitor differs */ |
| sdata->dev->type = ARPHRD_ETHER; |
| |
| switch (type) { |
| case NL80211_IFTYPE_AP: |
| skb_queue_head_init(&sdata->u.ap.ps_bc_buf); |
| INIT_LIST_HEAD(&sdata->u.ap.vlans); |
| break; |
| case NL80211_IFTYPE_STATION: |
| case NL80211_IFTYPE_ADHOC: |
| ieee80211_sta_setup_sdata(sdata); |
| break; |
| case NL80211_IFTYPE_MESH_POINT: |
| if (ieee80211_vif_is_mesh(&sdata->vif)) |
| ieee80211_mesh_init_sdata(sdata); |
| break; |
| case NL80211_IFTYPE_MONITOR: |
| sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; |
| sdata->dev->hard_start_xmit = ieee80211_monitor_start_xmit; |
| sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | |
| MONITOR_FLAG_OTHER_BSS; |
| break; |
| case NL80211_IFTYPE_WDS: |
| case NL80211_IFTYPE_AP_VLAN: |
| break; |
| case NL80211_IFTYPE_UNSPECIFIED: |
| case __NL80211_IFTYPE_AFTER_LAST: |
| BUG(); |
| break; |
| } |
| |
| ieee80211_debugfs_add_netdev(sdata); |
| } |
| |
| int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, |
| enum nl80211_iftype type) |
| { |
| ASSERT_RTNL(); |
| |
| if (type == sdata->vif.type) |
| return 0; |
| |
| /* |
| * We could, here, on changes between IBSS/STA/MESH modes, |
| * invoke an MLME function instead that disassociates etc. |
| * and goes into the requested mode. |
| */ |
| |
| if (netif_running(sdata->dev)) |
| return -EBUSY; |
| |
| /* Purge and reset type-dependent state. */ |
| ieee80211_teardown_sdata(sdata->dev); |
| ieee80211_setup_sdata(sdata, type); |
| |
| /* reset some values that shouldn't be kept across type changes */ |
| sdata->bss_conf.basic_rates = |
| ieee80211_mandatory_rates(sdata->local, |
| sdata->local->hw.conf.channel->band); |
| sdata->drop_unencrypted = 0; |
| |
| return 0; |
| } |
| |
| int ieee80211_if_add(struct ieee80211_local *local, const char *name, |
| struct net_device **new_dev, enum nl80211_iftype type, |
| struct vif_params *params) |
| { |
| struct net_device *ndev; |
| struct ieee80211_sub_if_data *sdata = NULL; |
| int ret, i; |
| |
| ASSERT_RTNL(); |
| |
| ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, |
| name, ieee80211_if_setup); |
| if (!ndev) |
| return -ENOMEM; |
| |
| ndev->needed_headroom = local->tx_headroom + |
| 4*6 /* four MAC addresses */ |
| + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ |
| + 6 /* mesh */ |
| + 8 /* rfc1042/bridge tunnel */ |
| - ETH_HLEN /* ethernet hard_header_len */ |
| + IEEE80211_ENCRYPT_HEADROOM; |
| ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; |
| |
| ret = dev_alloc_name(ndev, ndev->name); |
| if (ret < 0) |
| goto fail; |
| |
| memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN); |
| SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); |
| |
| /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */ |
| sdata = netdev_priv(ndev); |
| ndev->ieee80211_ptr = &sdata->wdev; |
| |
| /* initialise type-independent data */ |
| sdata->wdev.wiphy = local->hw.wiphy; |
| sdata->local = local; |
| sdata->dev = ndev; |
| |
| for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) |
| skb_queue_head_init(&sdata->fragments[i].skb_list); |
| |
| INIT_LIST_HEAD(&sdata->key_list); |
| |
| sdata->force_unicast_rateidx = -1; |
| sdata->max_ratectrl_rateidx = -1; |
| |
| /* setup type-dependent data */ |
| ieee80211_setup_sdata(sdata, type); |
| |
| ret = register_netdevice(ndev); |
| if (ret) |
| goto fail; |
| |
| ndev->uninit = ieee80211_teardown_sdata; |
| |
| if (ieee80211_vif_is_mesh(&sdata->vif) && |
| params && params->mesh_id_len) |
| ieee80211_sdata_set_mesh_id(sdata, |
| params->mesh_id_len, |
| params->mesh_id); |
| |
| list_add_tail_rcu(&sdata->list, &local->interfaces); |
| |
| if (new_dev) |
| *new_dev = ndev; |
| |
| return 0; |
| |
| fail: |
| free_netdev(ndev); |
| return ret; |
| } |
| |
| void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) |
| { |
| ASSERT_RTNL(); |
| |
| list_del_rcu(&sdata->list); |
| synchronize_rcu(); |
| unregister_netdevice(sdata->dev); |
| } |
| |
| /* |
| * Remove all interfaces, may only be called at hardware unregistration |
| * time because it doesn't do RCU-safe list removals. |
| */ |
| void ieee80211_remove_interfaces(struct ieee80211_local *local) |
| { |
| struct ieee80211_sub_if_data *sdata, *tmp; |
| |
| ASSERT_RTNL(); |
| |
| list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { |
| list_del(&sdata->list); |
| unregister_netdevice(sdata->dev); |
| } |
| } |