| /* |
| * Interface handling |
| * |
| * 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/slab.h> |
| #include <linux/kernel.h> |
| #include <linux/if_arp.h> |
| #include <linux/netdevice.h> |
| #include <linux/rtnetlink.h> |
| #include <net/mac80211.h> |
| #include <net/ieee80211_radiotap.h> |
| #include "ieee80211_i.h" |
| #include "sta_info.h" |
| #include "debugfs_netdev.h" |
| #include "mesh.h" |
| #include "led.h" |
| #include "driver-ops.h" |
| #include "wme.h" |
| #include "rate.h" |
| |
| /** |
| * DOC: Interface list locking |
| * |
| * The interface list in each struct ieee80211_local is protected |
| * three-fold: |
| * |
| * (1) modifications may only be done under the RTNL |
| * (2) modifications and readers are protected against each other by |
| * the iflist_mtx. |
| * (3) modifications are done in an RCU manner so atomic readers |
| * can traverse the list in RCU-safe blocks. |
| * |
| * As a consequence, reads (traversals) of the list can be protected |
| * by either the RTNL, the iflist_mtx or RCU. |
| */ |
| |
| bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata) |
| { |
| struct ieee80211_chanctx_conf *chanctx_conf; |
| int power; |
| |
| rcu_read_lock(); |
| chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); |
| if (!chanctx_conf) { |
| rcu_read_unlock(); |
| return false; |
| } |
| |
| power = chanctx_conf->def.chan->max_power; |
| rcu_read_unlock(); |
| |
| if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL) |
| power = min(power, sdata->user_power_level); |
| |
| if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL) |
| power = min(power, sdata->ap_power_level); |
| |
| if (power != sdata->vif.bss_conf.txpower) { |
| sdata->vif.bss_conf.txpower = power; |
| ieee80211_hw_config(sdata->local, 0); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata) |
| { |
| if (__ieee80211_recalc_txpower(sdata)) |
| ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER); |
| } |
| |
| static u32 ieee80211_idle_off(struct ieee80211_local *local) |
| { |
| if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) |
| return 0; |
| |
| local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; |
| return IEEE80211_CONF_CHANGE_IDLE; |
| } |
| |
| static u32 ieee80211_idle_on(struct ieee80211_local *local) |
| { |
| if (local->hw.conf.flags & IEEE80211_CONF_IDLE) |
| return 0; |
| |
| ieee80211_flush_queues(local, NULL); |
| |
| local->hw.conf.flags |= IEEE80211_CONF_IDLE; |
| return IEEE80211_CONF_CHANGE_IDLE; |
| } |
| |
| void ieee80211_recalc_idle(struct ieee80211_local *local) |
| { |
| bool working = false, scanning, active; |
| unsigned int led_trig_start = 0, led_trig_stop = 0; |
| struct ieee80211_roc_work *roc; |
| u32 change; |
| |
| lockdep_assert_held(&local->mtx); |
| |
| active = !list_empty(&local->chanctx_list) || local->monitors; |
| |
| if (!local->ops->remain_on_channel) { |
| list_for_each_entry(roc, &local->roc_list, list) { |
| working = true; |
| break; |
| } |
| } |
| |
| scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || |
| test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); |
| |
| if (working || scanning) |
| led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; |
| else |
| led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; |
| |
| if (active) |
| led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; |
| else |
| led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; |
| |
| ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); |
| |
| if (working || scanning || active) |
| change = ieee80211_idle_off(local); |
| else |
| change = ieee80211_idle_on(local); |
| if (change) |
| ieee80211_hw_config(local, change); |
| } |
| |
| static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) |
| { |
| if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN) |
| return -EINVAL; |
| |
| dev->mtu = new_mtu; |
| return 0; |
| } |
| |
| static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr) |
| { |
| struct ieee80211_sub_if_data *sdata; |
| u64 new, mask, tmp; |
| u8 *m; |
| int ret = 0; |
| |
| if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) |
| return 0; |
| |
| m = addr; |
| new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | |
| ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | |
| ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); |
| |
| m = local->hw.wiphy->addr_mask; |
| mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | |
| ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | |
| ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); |
| |
| |
| mutex_lock(&local->iflist_mtx); |
| list_for_each_entry(sdata, &local->interfaces, list) { |
| if (sdata->vif.type == NL80211_IFTYPE_MONITOR) |
| continue; |
| |
| m = sdata->vif.addr; |
| tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | |
| ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | |
| ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); |
| |
| if ((new & ~mask) != (tmp & ~mask)) { |
| ret = -EINVAL; |
| break; |
| } |
| } |
| mutex_unlock(&local->iflist_mtx); |
| |
| return ret; |
| } |
| |
| static int ieee80211_change_mac(struct net_device *dev, void *addr) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| struct sockaddr *sa = addr; |
| int ret; |
| |
| if (ieee80211_sdata_running(sdata)) |
| return -EBUSY; |
| |
| ret = ieee80211_verify_mac(sdata->local, sa->sa_data); |
| if (ret) |
| return ret; |
| |
| ret = eth_mac_addr(dev, sa); |
| |
| if (ret == 0) |
| memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); |
| |
| return ret; |
| } |
| |
| static inline int identical_mac_addr_allowed(int type1, int type2) |
| { |
| return type1 == NL80211_IFTYPE_MONITOR || |
| type2 == NL80211_IFTYPE_MONITOR || |
| type1 == NL80211_IFTYPE_P2P_DEVICE || |
| type2 == NL80211_IFTYPE_P2P_DEVICE || |
| (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || |
| (type1 == NL80211_IFTYPE_WDS && |
| (type2 == NL80211_IFTYPE_WDS || |
| type2 == NL80211_IFTYPE_AP)) || |
| (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || |
| (type1 == NL80211_IFTYPE_AP_VLAN && |
| (type2 == NL80211_IFTYPE_AP || |
| type2 == NL80211_IFTYPE_AP_VLAN)); |
| } |
| |
| static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, |
| enum nl80211_iftype iftype) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct ieee80211_sub_if_data *nsdata; |
| |
| ASSERT_RTNL(); |
| |
| /* we hold the RTNL here so can safely walk the list */ |
| list_for_each_entry(nsdata, &local->interfaces, list) { |
| if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { |
| /* |
| * Allow only a single IBSS interface to be up at any |
| * time. This is restricted because beacon distribution |
| * cannot work properly if both are in the same IBSS. |
| * |
| * To remove this restriction we'd have to disallow them |
| * from setting the same SSID on different IBSS interfaces |
| * belonging to the same hardware. Then, however, we're |
| * faced with having to adopt two different TSF timers... |
| */ |
| if (iftype == NL80211_IFTYPE_ADHOC && |
| nsdata->vif.type == NL80211_IFTYPE_ADHOC) |
| return -EBUSY; |
| |
| /* |
| * The remaining checks are only performed for interfaces |
| * with the same MAC address. |
| */ |
| if (!ether_addr_equal(sdata->vif.addr, |
| nsdata->vif.addr)) |
| continue; |
| |
| /* |
| * check whether it may have the same address |
| */ |
| if (!identical_mac_addr_allowed(iftype, |
| nsdata->vif.type)) |
| return -ENOTUNIQ; |
| |
| /* |
| * can only add VLANs to enabled APs |
| */ |
| if (iftype == NL80211_IFTYPE_AP_VLAN && |
| nsdata->vif.type == NL80211_IFTYPE_AP) |
| sdata->bss = &nsdata->u.ap; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata) |
| { |
| int n_queues = sdata->local->hw.queues; |
| int i; |
| |
| if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) { |
| for (i = 0; i < IEEE80211_NUM_ACS; i++) { |
| if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == |
| IEEE80211_INVAL_HW_QUEUE)) |
| return -EINVAL; |
| if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= |
| n_queues)) |
| return -EINVAL; |
| } |
| } |
| |
| if ((sdata->vif.type != NL80211_IFTYPE_AP && |
| sdata->vif.type != NL80211_IFTYPE_MESH_POINT) || |
| !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) { |
| sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; |
| return 0; |
| } |
| |
| if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) |
| return -EINVAL; |
| |
| if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, |
| const int offset) |
| { |
| struct ieee80211_local *local = sdata->local; |
| u32 flags = sdata->u.mntr_flags; |
| |
| #define ADJUST(_f, _s) do { \ |
| if (flags & MONITOR_FLAG_##_f) \ |
| local->fif_##_s += offset; \ |
| } while (0) |
| |
| ADJUST(FCSFAIL, fcsfail); |
| ADJUST(PLCPFAIL, plcpfail); |
| ADJUST(CONTROL, control); |
| ADJUST(CONTROL, pspoll); |
| ADJUST(OTHER_BSS, other_bss); |
| |
| #undef ADJUST |
| } |
| |
| static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) |
| { |
| struct ieee80211_local *local = sdata->local; |
| int i; |
| |
| for (i = 0; i < IEEE80211_NUM_ACS; i++) { |
| if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) |
| sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; |
| else if (local->hw.queues >= IEEE80211_NUM_ACS) |
| sdata->vif.hw_queue[i] = i; |
| else |
| sdata->vif.hw_queue[i] = 0; |
| } |
| sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; |
| } |
| |
| static int ieee80211_add_virtual_monitor(struct ieee80211_local *local) |
| { |
| struct ieee80211_sub_if_data *sdata; |
| int ret = 0; |
| |
| if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) |
| return 0; |
| |
| mutex_lock(&local->iflist_mtx); |
| |
| if (local->monitor_sdata) |
| goto out_unlock; |
| |
| sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); |
| if (!sdata) { |
| ret = -ENOMEM; |
| goto out_unlock; |
| } |
| |
| /* set up data */ |
| sdata->local = local; |
| sdata->vif.type = NL80211_IFTYPE_MONITOR; |
| snprintf(sdata->name, IFNAMSIZ, "%s-monitor", |
| wiphy_name(local->hw.wiphy)); |
| |
| ieee80211_set_default_queues(sdata); |
| |
| ret = drv_add_interface(local, sdata); |
| if (WARN_ON(ret)) { |
| /* ok .. stupid driver, it asked for this! */ |
| kfree(sdata); |
| goto out_unlock; |
| } |
| |
| ret = ieee80211_check_queues(sdata); |
| if (ret) { |
| kfree(sdata); |
| goto out_unlock; |
| } |
| |
| ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef, |
| IEEE80211_CHANCTX_EXCLUSIVE); |
| if (ret) { |
| drv_remove_interface(local, sdata); |
| kfree(sdata); |
| goto out_unlock; |
| } |
| |
| rcu_assign_pointer(local->monitor_sdata, sdata); |
| out_unlock: |
| mutex_unlock(&local->iflist_mtx); |
| return ret; |
| } |
| |
| static void ieee80211_del_virtual_monitor(struct ieee80211_local *local) |
| { |
| struct ieee80211_sub_if_data *sdata; |
| |
| if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) |
| return; |
| |
| mutex_lock(&local->iflist_mtx); |
| |
| sdata = rcu_dereference_protected(local->monitor_sdata, |
| lockdep_is_held(&local->iflist_mtx)); |
| if (!sdata) |
| goto out_unlock; |
| |
| rcu_assign_pointer(local->monitor_sdata, NULL); |
| synchronize_net(); |
| |
| ieee80211_vif_release_channel(sdata); |
| |
| drv_remove_interface(local, sdata); |
| |
| kfree(sdata); |
| out_unlock: |
| mutex_unlock(&local->iflist_mtx); |
| } |
| |
| /* |
| * NOTE: Be very careful when changing this function, it must NOT return |
| * an error on interface type changes that have been pre-checked, so most |
| * checks should be in ieee80211_check_concurrent_iface. |
| */ |
| int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); |
| struct net_device *dev = wdev->netdev; |
| struct ieee80211_local *local = sdata->local; |
| struct sta_info *sta; |
| u32 changed = 0; |
| int res; |
| u32 hw_reconf_flags = 0; |
| |
| switch (sdata->vif.type) { |
| case NL80211_IFTYPE_WDS: |
| if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) |
| return -ENOLINK; |
| break; |
| case NL80211_IFTYPE_AP_VLAN: { |
| struct ieee80211_sub_if_data *master; |
| |
| if (!sdata->bss) |
| return -ENOLINK; |
| |
| list_add(&sdata->u.vlan.list, &sdata->bss->vlans); |
| |
| master = container_of(sdata->bss, |
| struct ieee80211_sub_if_data, u.ap); |
| sdata->control_port_protocol = |
| master->control_port_protocol; |
| sdata->control_port_no_encrypt = |
| master->control_port_no_encrypt; |
| break; |
| } |
| case NL80211_IFTYPE_AP: |
| sdata->bss = &sdata->u.ap; |
| break; |
| case NL80211_IFTYPE_MESH_POINT: |
| case NL80211_IFTYPE_STATION: |
| case NL80211_IFTYPE_MONITOR: |
| case NL80211_IFTYPE_ADHOC: |
| case NL80211_IFTYPE_P2P_DEVICE: |
| /* no special treatment */ |
| break; |
| case NL80211_IFTYPE_UNSPECIFIED: |
| case NUM_NL80211_IFTYPES: |
| case NL80211_IFTYPE_P2P_CLIENT: |
| case NL80211_IFTYPE_P2P_GO: |
| /* cannot happen */ |
| WARN_ON(1); |
| break; |
| } |
| |
| if (local->open_count == 0) { |
| res = drv_start(local); |
| if (res) |
| goto err_del_bss; |
| /* we're brought up, everything changes */ |
| hw_reconf_flags = ~0; |
| ieee80211_led_radio(local, true); |
| ieee80211_mod_tpt_led_trig(local, |
| IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); |
| } |
| |
| /* |
| * Copy the hopefully now-present MAC address to |
| * this interface, if it has the special null one. |
| */ |
| if (dev && is_zero_ether_addr(dev->dev_addr)) { |
| memcpy(dev->dev_addr, |
| local->hw.wiphy->perm_addr, |
| ETH_ALEN); |
| memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); |
| |
| if (!is_valid_ether_addr(dev->dev_addr)) { |
| res = -EADDRNOTAVAIL; |
| goto err_stop; |
| } |
| } |
| |
| switch (sdata->vif.type) { |
| case NL80211_IFTYPE_AP_VLAN: |
| /* no need to tell driver, but set carrier and chanctx */ |
| if (rtnl_dereference(sdata->bss->beacon)) { |
| ieee80211_vif_vlan_copy_chanctx(sdata); |
| netif_carrier_on(dev); |
| } else { |
| netif_carrier_off(dev); |
| } |
| break; |
| case NL80211_IFTYPE_MONITOR: |
| if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { |
| local->cooked_mntrs++; |
| break; |
| } |
| |
| if (local->monitors == 0 && local->open_count == 0) { |
| res = ieee80211_add_virtual_monitor(local); |
| if (res) |
| goto err_stop; |
| } |
| |
| /* must be before the call to ieee80211_configure_filter */ |
| local->monitors++; |
| if (local->monitors == 1) { |
| local->hw.conf.flags |= IEEE80211_CONF_MONITOR; |
| hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; |
| } |
| |
| ieee80211_adjust_monitor_flags(sdata, 1); |
| ieee80211_configure_filter(local); |
| mutex_lock(&local->mtx); |
| ieee80211_recalc_idle(local); |
| mutex_unlock(&local->mtx); |
| |
| netif_carrier_on(dev); |
| break; |
| default: |
| if (coming_up) { |
| ieee80211_del_virtual_monitor(local); |
| |
| res = drv_add_interface(local, sdata); |
| if (res) |
| goto err_stop; |
| res = ieee80211_check_queues(sdata); |
| if (res) |
| goto err_del_interface; |
| } |
| |
| if (sdata->vif.type == NL80211_IFTYPE_AP) { |
| local->fif_pspoll++; |
| local->fif_probe_req++; |
| |
| ieee80211_configure_filter(local); |
| } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
| local->fif_probe_req++; |
| } |
| |
| if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) |
| changed |= ieee80211_reset_erp_info(sdata); |
| ieee80211_bss_info_change_notify(sdata, changed); |
| |
| switch (sdata->vif.type) { |
| case NL80211_IFTYPE_STATION: |
| case NL80211_IFTYPE_ADHOC: |
| case NL80211_IFTYPE_AP: |
| case NL80211_IFTYPE_MESH_POINT: |
| netif_carrier_off(dev); |
| break; |
| case NL80211_IFTYPE_WDS: |
| case NL80211_IFTYPE_P2P_DEVICE: |
| break; |
| default: |
| netif_carrier_on(dev); |
| } |
| |
| /* |
| * set default queue parameters so drivers don't |
| * need to initialise the hardware if the hardware |
| * doesn't start up with sane defaults |
| */ |
| ieee80211_set_wmm_default(sdata, true); |
| } |
| |
| set_bit(SDATA_STATE_RUNNING, &sdata->state); |
| |
| if (sdata->vif.type == NL80211_IFTYPE_WDS) { |
| /* Create STA entry for the WDS peer */ |
| sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, |
| GFP_KERNEL); |
| if (!sta) { |
| res = -ENOMEM; |
| goto err_del_interface; |
| } |
| |
| sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); |
| sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); |
| sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); |
| |
| res = sta_info_insert(sta); |
| if (res) { |
| /* STA has been freed */ |
| goto err_del_interface; |
| } |
| |
| rate_control_rate_init(sta); |
| netif_carrier_on(dev); |
| } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { |
| rcu_assign_pointer(local->p2p_sdata, sdata); |
| } |
| |
| /* |
| * set_multicast_list will be invoked by the networking core |
| * which will check whether any increments here were done in |
| * error and sync them down to the hardware as filter flags. |
| */ |
| if (sdata->flags & IEEE80211_SDATA_ALLMULTI) |
| atomic_inc(&local->iff_allmultis); |
| |
| if (sdata->flags & IEEE80211_SDATA_PROMISC) |
| atomic_inc(&local->iff_promiscs); |
| |
| if (coming_up) |
| local->open_count++; |
| |
| if (hw_reconf_flags) |
| ieee80211_hw_config(local, hw_reconf_flags); |
| |
| ieee80211_recalc_ps(local, -1); |
| |
| if (dev) |
| netif_tx_start_all_queues(dev); |
| |
| return 0; |
| err_del_interface: |
| drv_remove_interface(local, sdata); |
| err_stop: |
| if (!local->open_count) |
| drv_stop(local); |
| err_del_bss: |
| sdata->bss = NULL; |
| if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
| list_del(&sdata->u.vlan.list); |
| /* might already be clear but that doesn't matter */ |
| clear_bit(SDATA_STATE_RUNNING, &sdata->state); |
| return res; |
| } |
| |
| static int ieee80211_open(struct net_device *dev) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| int err; |
| |
| /* fail early if user set an invalid address */ |
| if (!is_valid_ether_addr(dev->dev_addr)) |
| return -EADDRNOTAVAIL; |
| |
| err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); |
| if (err) |
| return err; |
| |
| return ieee80211_do_open(&sdata->wdev, true); |
| } |
| |
| static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, |
| bool going_down) |
| { |
| struct ieee80211_local *local = sdata->local; |
| unsigned long flags; |
| struct sk_buff *skb, *tmp; |
| u32 hw_reconf_flags = 0; |
| int i, flushed; |
| struct ps_data *ps; |
| |
| clear_bit(SDATA_STATE_RUNNING, &sdata->state); |
| |
| if (rcu_access_pointer(local->scan_sdata) == sdata) |
| ieee80211_scan_cancel(local); |
| |
| /* |
| * Stop TX on this interface first. |
| */ |
| if (sdata->dev) |
| netif_tx_stop_all_queues(sdata->dev); |
| |
| ieee80211_roc_purge(sdata); |
| |
| if (sdata->vif.type == NL80211_IFTYPE_STATION) |
| ieee80211_mgd_stop(sdata); |
| |
| /* |
| * Remove all stations associated with this interface. |
| * |
| * This must be done before calling ops->remove_interface() |
| * because otherwise we can later invoke ops->sta_notify() |
| * whenever the STAs are removed, and that invalidates driver |
| * assumptions about always getting a vif pointer that is valid |
| * (because if we remove a STA after ops->remove_interface() |
| * the driver will have removed the vif info already!) |
| * |
| * This is relevant only in WDS mode, in all other modes we've |
| * already removed all stations when disconnecting or similar, |
| * so warn otherwise. |
| * |
| * We call sta_info_flush_cleanup() later, to combine RCU waits. |
| */ |
| flushed = sta_info_flush_defer(sdata); |
| WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) || |
| (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)); |
| |
| /* don't count this interface for promisc/allmulti while it is down */ |
| if (sdata->flags & IEEE80211_SDATA_ALLMULTI) |
| atomic_dec(&local->iff_allmultis); |
| |
| if (sdata->flags & IEEE80211_SDATA_PROMISC) |
| atomic_dec(&local->iff_promiscs); |
| |
| if (sdata->vif.type == NL80211_IFTYPE_AP) { |
| local->fif_pspoll--; |
| local->fif_probe_req--; |
| } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
| local->fif_probe_req--; |
| } |
| |
| if (sdata->dev) { |
| netif_addr_lock_bh(sdata->dev); |
| spin_lock_bh(&local->filter_lock); |
| __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, |
| sdata->dev->addr_len); |
| spin_unlock_bh(&local->filter_lock); |
| netif_addr_unlock_bh(sdata->dev); |
| |
| ieee80211_configure_filter(local); |
| } |
| |
| del_timer_sync(&local->dynamic_ps_timer); |
| cancel_work_sync(&local->dynamic_ps_enable_work); |
| |
| cancel_work_sync(&sdata->recalc_smps); |
| |
| cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); |
| |
| if (sdata->wdev.cac_started) { |
| mutex_lock(&local->iflist_mtx); |
| ieee80211_vif_release_channel(sdata); |
| mutex_unlock(&local->iflist_mtx); |
| cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED, |
| GFP_KERNEL); |
| } |
| |
| /* APs need special treatment */ |
| if (sdata->vif.type == NL80211_IFTYPE_AP) { |
| struct ieee80211_sub_if_data *vlan, *tmpsdata; |
| |
| /* down all dependent devices, that is VLANs */ |
| list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, |
| u.vlan.list) |
| dev_close(vlan->dev); |
| WARN_ON(!list_empty(&sdata->u.ap.vlans)); |
| } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
| /* remove all packets in parent bc_buf pointing to this dev */ |
| ps = &sdata->bss->ps; |
| |
| spin_lock_irqsave(&ps->bc_buf.lock, flags); |
| skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { |
| if (skb->dev == sdata->dev) { |
| __skb_unlink(skb, &ps->bc_buf); |
| local->total_ps_buffered--; |
| ieee80211_free_txskb(&local->hw, skb); |
| } |
| } |
| spin_unlock_irqrestore(&ps->bc_buf.lock, flags); |
| } |
| |
| if (going_down) |
| local->open_count--; |
| |
| switch (sdata->vif.type) { |
| case NL80211_IFTYPE_AP_VLAN: |
| list_del(&sdata->u.vlan.list); |
| rcu_assign_pointer(sdata->vif.chanctx_conf, NULL); |
| /* no need to tell driver */ |
| break; |
| case NL80211_IFTYPE_MONITOR: |
| if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { |
| local->cooked_mntrs--; |
| break; |
| } |
| |
| local->monitors--; |
| if (local->monitors == 0) { |
| local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; |
| hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; |
| ieee80211_del_virtual_monitor(local); |
| } |
| |
| ieee80211_adjust_monitor_flags(sdata, -1); |
| ieee80211_configure_filter(local); |
| mutex_lock(&local->mtx); |
| ieee80211_recalc_idle(local); |
| mutex_unlock(&local->mtx); |
| break; |
| case NL80211_IFTYPE_P2P_DEVICE: |
| /* relies on synchronize_rcu() below */ |
| rcu_assign_pointer(local->p2p_sdata, NULL); |
| /* fall through */ |
| default: |
| cancel_work_sync(&sdata->work); |
| /* |
| * When we get here, the interface is marked down. |
| * |
| * sta_info_flush_cleanup() requires rcu_barrier() |
| * first to wait for the station call_rcu() calls |
| * to complete, here we need at least sychronize_rcu() |
| * it to wait for the RX path in case it is using the |
| * interface and enqueuing frames at this very time on |
| * another CPU. |
| */ |
| rcu_barrier(); |
| sta_info_flush_cleanup(sdata); |
| |
| /* |
| * Free all remaining keys, there shouldn't be any, |
| * except maybe in WDS mode? |
| */ |
| ieee80211_free_keys(sdata); |
| |
| /* fall through */ |
| case NL80211_IFTYPE_AP: |
| skb_queue_purge(&sdata->skb_queue); |
| |
| if (going_down) |
| drv_remove_interface(local, sdata); |
| } |
| |
| sdata->bss = NULL; |
| |
| ieee80211_recalc_ps(local, -1); |
| |
| if (local->open_count == 0) { |
| ieee80211_clear_tx_pending(local); |
| ieee80211_stop_device(local); |
| |
| /* no reconfiguring after stop! */ |
| hw_reconf_flags = 0; |
| } |
| |
| /* do after stop to avoid reconfiguring when we stop anyway */ |
| if (hw_reconf_flags) |
| ieee80211_hw_config(local, hw_reconf_flags); |
| |
| spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
| for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { |
| skb_queue_walk_safe(&local->pending[i], skb, tmp) { |
| struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
| if (info->control.vif == &sdata->vif) { |
| __skb_unlink(skb, &local->pending[i]); |
| ieee80211_free_txskb(&local->hw, skb); |
| } |
| } |
| } |
| spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
| |
| if (local->monitors == local->open_count && local->monitors > 0) |
| ieee80211_add_virtual_monitor(local); |
| } |
| |
| static int ieee80211_stop(struct net_device *dev) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| |
| ieee80211_do_stop(sdata, true); |
| |
| return 0; |
| } |
| |
| static void ieee80211_set_multicast_list(struct net_device *dev) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| struct ieee80211_local *local = sdata->local; |
| int allmulti, promisc, sdata_allmulti, sdata_promisc; |
| |
| allmulti = !!(dev->flags & IFF_ALLMULTI); |
| promisc = !!(dev->flags & IFF_PROMISC); |
| sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); |
| sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); |
| |
| if (allmulti != sdata_allmulti) { |
| if (dev->flags & IFF_ALLMULTI) |
| atomic_inc(&local->iff_allmultis); |
| else |
| atomic_dec(&local->iff_allmultis); |
| sdata->flags ^= IEEE80211_SDATA_ALLMULTI; |
| } |
| |
| if (promisc != sdata_promisc) { |
| if (dev->flags & IFF_PROMISC) |
| atomic_inc(&local->iff_promiscs); |
| else |
| atomic_dec(&local->iff_promiscs); |
| sdata->flags ^= IEEE80211_SDATA_PROMISC; |
| } |
| |
| /* |
| * TODO: If somebody needs this on AP interfaces, |
| * it can be enabled easily but multicast |
| * addresses from VLANs need to be synced. |
| */ |
| if (sdata->vif.type != NL80211_IFTYPE_MONITOR && |
| sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
| sdata->vif.type != NL80211_IFTYPE_AP) |
| drv_set_multicast_list(local, sdata, &dev->mc); |
| |
| spin_lock_bh(&local->filter_lock); |
| __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); |
| spin_unlock_bh(&local->filter_lock); |
| ieee80211_queue_work(&local->hw, &local->reconfig_filter); |
| } |
| |
| /* |
| * Called when the netdev is removed or, by the code below, before |
| * the interface type changes. |
| */ |
| static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) |
| { |
| 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; |
| |
| if (ieee80211_vif_is_mesh(&sdata->vif)) |
| mesh_rmc_free(sdata); |
| |
| flushed = sta_info_flush(sdata); |
| WARN_ON(flushed); |
| } |
| |
| static void ieee80211_uninit(struct net_device *dev) |
| { |
| ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); |
| } |
| |
| static u16 ieee80211_netdev_select_queue(struct net_device *dev, |
| struct sk_buff *skb) |
| { |
| return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); |
| } |
| |
| static const struct net_device_ops ieee80211_dataif_ops = { |
| .ndo_open = ieee80211_open, |
| .ndo_stop = ieee80211_stop, |
| .ndo_uninit = ieee80211_uninit, |
| .ndo_start_xmit = ieee80211_subif_start_xmit, |
| .ndo_set_rx_mode = ieee80211_set_multicast_list, |
| .ndo_change_mtu = ieee80211_change_mtu, |
| .ndo_set_mac_address = ieee80211_change_mac, |
| .ndo_select_queue = ieee80211_netdev_select_queue, |
| }; |
| |
| static u16 ieee80211_monitor_select_queue(struct net_device *dev, |
| struct sk_buff *skb) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| struct ieee80211_local *local = sdata->local; |
| struct ieee80211_hdr *hdr; |
| struct ieee80211_radiotap_header *rtap = (void *)skb->data; |
| |
| if (local->hw.queues < IEEE80211_NUM_ACS) |
| return 0; |
| |
| if (skb->len < 4 || |
| skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) |
| return 0; /* doesn't matter, frame will be dropped */ |
| |
| hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); |
| |
| return ieee80211_select_queue_80211(sdata, skb, hdr); |
| } |
| |
| static const struct net_device_ops ieee80211_monitorif_ops = { |
| .ndo_open = ieee80211_open, |
| .ndo_stop = ieee80211_stop, |
| .ndo_uninit = ieee80211_uninit, |
| .ndo_start_xmit = ieee80211_monitor_start_xmit, |
| .ndo_set_rx_mode = ieee80211_set_multicast_list, |
| .ndo_change_mtu = ieee80211_change_mtu, |
| .ndo_set_mac_address = eth_mac_addr, |
| .ndo_select_queue = ieee80211_monitor_select_queue, |
| }; |
| |
| static void ieee80211_if_setup(struct net_device *dev) |
| { |
| ether_setup(dev); |
| dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
| dev->netdev_ops = &ieee80211_dataif_ops; |
| dev->destructor = free_netdev; |
| } |
| |
| static void ieee80211_iface_work(struct work_struct *work) |
| { |
| struct ieee80211_sub_if_data *sdata = |
| container_of(work, struct ieee80211_sub_if_data, work); |
| struct ieee80211_local *local = sdata->local; |
| struct sk_buff *skb; |
| struct sta_info *sta; |
| struct ieee80211_ra_tid *ra_tid; |
| |
| if (!ieee80211_sdata_running(sdata)) |
| return; |
| |
| if (local->scanning) |
| return; |
| |
| /* |
| * ieee80211_queue_work() should have picked up most cases, |
| * here we'll pick the rest. |
| */ |
| if (WARN(local->suspended, |
| "interface work scheduled while going to suspend\n")) |
| return; |
| |
| /* first process frames */ |
| while ((skb = skb_dequeue(&sdata->skb_queue))) { |
| struct ieee80211_mgmt *mgmt = (void *)skb->data; |
| |
| if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { |
| ra_tid = (void *)&skb->cb; |
| ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, |
| ra_tid->tid); |
| } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { |
| ra_tid = (void *)&skb->cb; |
| ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, |
| ra_tid->tid); |
| } else if (ieee80211_is_action(mgmt->frame_control) && |
| mgmt->u.action.category == WLAN_CATEGORY_BACK) { |
| int len = skb->len; |
| |
| mutex_lock(&local->sta_mtx); |
| sta = sta_info_get_bss(sdata, mgmt->sa); |
| if (sta) { |
| switch (mgmt->u.action.u.addba_req.action_code) { |
| case WLAN_ACTION_ADDBA_REQ: |
| ieee80211_process_addba_request( |
| local, sta, mgmt, len); |
| break; |
| case WLAN_ACTION_ADDBA_RESP: |
| ieee80211_process_addba_resp(local, sta, |
| mgmt, len); |
| break; |
| case WLAN_ACTION_DELBA: |
| ieee80211_process_delba(sdata, sta, |
| mgmt, len); |
| break; |
| default: |
| WARN_ON(1); |
| break; |
| } |
| } |
| mutex_unlock(&local->sta_mtx); |
| } else if (ieee80211_is_data_qos(mgmt->frame_control)) { |
| struct ieee80211_hdr *hdr = (void *)mgmt; |
| /* |
| * So the frame isn't mgmt, but frame_control |
| * is at the right place anyway, of course, so |
| * the if statement is correct. |
| * |
| * Warn if we have other data frame types here, |
| * they must not get here. |
| */ |
| WARN_ON(hdr->frame_control & |
| cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); |
| WARN_ON(!(hdr->seq_ctrl & |
| cpu_to_le16(IEEE80211_SCTL_FRAG))); |
| /* |
| * This was a fragment of a frame, received while |
| * a block-ack session was active. That cannot be |
| * right, so terminate the session. |
| */ |
| mutex_lock(&local->sta_mtx); |
| sta = sta_info_get_bss(sdata, mgmt->sa); |
| if (sta) { |
| u16 tid = *ieee80211_get_qos_ctl(hdr) & |
| IEEE80211_QOS_CTL_TID_MASK; |
| |
| __ieee80211_stop_rx_ba_session( |
| sta, tid, WLAN_BACK_RECIPIENT, |
| WLAN_REASON_QSTA_REQUIRE_SETUP, |
| true); |
| } |
| mutex_unlock(&local->sta_mtx); |
| } else switch (sdata->vif.type) { |
| case NL80211_IFTYPE_STATION: |
| ieee80211_sta_rx_queued_mgmt(sdata, skb); |
| break; |
| case NL80211_IFTYPE_ADHOC: |
| ieee80211_ibss_rx_queued_mgmt(sdata, skb); |
| break; |
| case NL80211_IFTYPE_MESH_POINT: |
| if (!ieee80211_vif_is_mesh(&sdata->vif)) |
| break; |
| ieee80211_mesh_rx_queued_mgmt(sdata, skb); |
| break; |
| default: |
| WARN(1, "frame for unexpected interface type"); |
| break; |
| } |
| |
| kfree_skb(skb); |
| } |
| |
| /* then other type-dependent work */ |
| switch (sdata->vif.type) { |
| case NL80211_IFTYPE_STATION: |
| ieee80211_sta_work(sdata); |
| break; |
| case NL80211_IFTYPE_ADHOC: |
| ieee80211_ibss_work(sdata); |
| break; |
| case NL80211_IFTYPE_MESH_POINT: |
| if (!ieee80211_vif_is_mesh(&sdata->vif)) |
| break; |
| ieee80211_mesh_work(sdata); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static void ieee80211_recalc_smps_work(struct work_struct *work) |
| { |
| struct ieee80211_sub_if_data *sdata = |
| container_of(work, struct ieee80211_sub_if_data, recalc_smps); |
| |
| ieee80211_recalc_smps(sdata); |
| } |
| |
| /* |
| * 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; |
| sdata->vif.p2p = false; |
| sdata->wdev.iftype = type; |
| |
| sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); |
| sdata->control_port_no_encrypt = false; |
| |
| sdata->noack_map = 0; |
| |
| /* only monitor/p2p-device differ */ |
| if (sdata->dev) { |
| sdata->dev->netdev_ops = &ieee80211_dataif_ops; |
| sdata->dev->type = ARPHRD_ETHER; |
| } |
| |
| skb_queue_head_init(&sdata->skb_queue); |
| INIT_WORK(&sdata->work, ieee80211_iface_work); |
| INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); |
| |
| switch (type) { |
| case NL80211_IFTYPE_P2P_GO: |
| type = NL80211_IFTYPE_AP; |
| sdata->vif.type = type; |
| sdata->vif.p2p = true; |
| /* fall through */ |
| case NL80211_IFTYPE_AP: |
| skb_queue_head_init(&sdata->u.ap.ps.bc_buf); |
| INIT_LIST_HEAD(&sdata->u.ap.vlans); |
| sdata->vif.bss_conf.bssid = sdata->vif.addr; |
| break; |
| case NL80211_IFTYPE_P2P_CLIENT: |
| type = NL80211_IFTYPE_STATION; |
| sdata->vif.type = type; |
| sdata->vif.p2p = true; |
| /* fall through */ |
| case NL80211_IFTYPE_STATION: |
| sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; |
| ieee80211_sta_setup_sdata(sdata); |
| break; |
| case NL80211_IFTYPE_ADHOC: |
| sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; |
| ieee80211_ibss_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->netdev_ops = &ieee80211_monitorif_ops; |
| sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | |
| MONITOR_FLAG_OTHER_BSS; |
| break; |
| case NL80211_IFTYPE_WDS: |
| sdata->vif.bss_conf.bssid = NULL; |
| break; |
| case NL80211_IFTYPE_AP_VLAN: |
| break; |
| case NL80211_IFTYPE_P2P_DEVICE: |
| sdata->vif.bss_conf.bssid = sdata->vif.addr; |
| break; |
| case NL80211_IFTYPE_UNSPECIFIED: |
| case NUM_NL80211_IFTYPES: |
| BUG(); |
| break; |
| } |
| |
| ieee80211_debugfs_add_netdev(sdata); |
| } |
| |
| static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, |
| enum nl80211_iftype type) |
| { |
| struct ieee80211_local *local = sdata->local; |
| int ret, err; |
| enum nl80211_iftype internal_type = type; |
| bool p2p = false; |
| |
| ASSERT_RTNL(); |
| |
| if (!local->ops->change_interface) |
| return -EBUSY; |
| |
| switch (sdata->vif.type) { |
| case NL80211_IFTYPE_AP: |
| case NL80211_IFTYPE_STATION: |
| case NL80211_IFTYPE_ADHOC: |
| /* |
| * Could maybe also all others here? |
| * Just not sure how that interacts |
| * with the RX/config path e.g. for |
| * mesh. |
| */ |
| break; |
| default: |
| return -EBUSY; |
| } |
| |
| switch (type) { |
| case NL80211_IFTYPE_AP: |
| case NL80211_IFTYPE_STATION: |
| case NL80211_IFTYPE_ADHOC: |
| /* |
| * Could probably support everything |
| * but WDS here (WDS do_open can fail |
| * under memory pressure, which this |
| * code isn't prepared to handle). |
| */ |
| break; |
| case NL80211_IFTYPE_P2P_CLIENT: |
| p2p = true; |
| internal_type = NL80211_IFTYPE_STATION; |
| break; |
| case NL80211_IFTYPE_P2P_GO: |
| p2p = true; |
| internal_type = NL80211_IFTYPE_AP; |
| break; |
| default: |
| return -EBUSY; |
| } |
| |
| ret = ieee80211_check_concurrent_iface(sdata, internal_type); |
| if (ret) |
| return ret; |
| |
| ieee80211_do_stop(sdata, false); |
| |
| ieee80211_teardown_sdata(sdata); |
| |
| ret = drv_change_interface(local, sdata, internal_type, p2p); |
| if (ret) |
| type = sdata->vif.type; |
| |
| /* |
| * Ignore return value here, there's not much we can do since |
| * the driver changed the interface type internally already. |
| * The warnings will hopefully make driver authors fix it :-) |
| */ |
| ieee80211_check_queues(sdata); |
| |
| ieee80211_setup_sdata(sdata, type); |
| |
| err = ieee80211_do_open(&sdata->wdev, false); |
| WARN(err, "type change: do_open returned %d", err); |
| |
| return ret; |
| } |
| |
| int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, |
| enum nl80211_iftype type) |
| { |
| int ret; |
| |
| ASSERT_RTNL(); |
| |
| if (type == ieee80211_vif_type_p2p(&sdata->vif)) |
| return 0; |
| |
| if (ieee80211_sdata_running(sdata)) { |
| ret = ieee80211_runtime_change_iftype(sdata, type); |
| if (ret) |
| return ret; |
| } else { |
| /* Purge and reset type-dependent state. */ |
| ieee80211_teardown_sdata(sdata); |
| ieee80211_setup_sdata(sdata, type); |
| } |
| |
| /* reset some values that shouldn't be kept across type changes */ |
| sdata->drop_unencrypted = 0; |
| if (type == NL80211_IFTYPE_STATION) |
| sdata->u.mgd.use_4addr = false; |
| |
| return 0; |
| } |
| |
| static void ieee80211_assign_perm_addr(struct ieee80211_local *local, |
| u8 *perm_addr, enum nl80211_iftype type) |
| { |
| struct ieee80211_sub_if_data *sdata; |
| u64 mask, start, addr, val, inc; |
| u8 *m; |
| u8 tmp_addr[ETH_ALEN]; |
| int i; |
| |
| /* default ... something at least */ |
| memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); |
| |
| if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && |
| local->hw.wiphy->n_addresses <= 1) |
| return; |
| |
| mutex_lock(&local->iflist_mtx); |
| |
| switch (type) { |
| case NL80211_IFTYPE_MONITOR: |
| /* doesn't matter */ |
| break; |
| case NL80211_IFTYPE_WDS: |
| case NL80211_IFTYPE_AP_VLAN: |
| /* match up with an AP interface */ |
| list_for_each_entry(sdata, &local->interfaces, list) { |
| if (sdata->vif.type != NL80211_IFTYPE_AP) |
| continue; |
| memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); |
| break; |
| } |
| /* keep default if no AP interface present */ |
| break; |
| case NL80211_IFTYPE_P2P_CLIENT: |
| case NL80211_IFTYPE_P2P_GO: |
| if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) { |
| list_for_each_entry(sdata, &local->interfaces, list) { |
| if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) |
| continue; |
| if (!ieee80211_sdata_running(sdata)) |
| continue; |
| memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); |
| goto out_unlock; |
| } |
| } |
| /* otherwise fall through */ |
| default: |
| /* assign a new address if possible -- try n_addresses first */ |
| for (i = 0; i < local->hw.wiphy->n_addresses; i++) { |
| bool used = false; |
| |
| list_for_each_entry(sdata, &local->interfaces, list) { |
| if (memcmp(local->hw.wiphy->addresses[i].addr, |
| sdata->vif.addr, ETH_ALEN) == 0) { |
| used = true; |
| break; |
| } |
| } |
| |
| if (!used) { |
| memcpy(perm_addr, |
| local->hw.wiphy->addresses[i].addr, |
| ETH_ALEN); |
| break; |
| } |
| } |
| |
| /* try mask if available */ |
| if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) |
| break; |
| |
| m = local->hw.wiphy->addr_mask; |
| mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | |
| ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | |
| ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); |
| |
| if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { |
| /* not a contiguous mask ... not handled now! */ |
| pr_info("not contiguous\n"); |
| break; |
| } |
| |
| m = local->hw.wiphy->perm_addr; |
| start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | |
| ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | |
| ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); |
| |
| inc = 1ULL<<__ffs64(mask); |
| val = (start & mask); |
| addr = (start & ~mask) | (val & mask); |
| do { |
| bool used = false; |
| |
| tmp_addr[5] = addr >> 0*8; |
| tmp_addr[4] = addr >> 1*8; |
| tmp_addr[3] = addr >> 2*8; |
| tmp_addr[2] = addr >> 3*8; |
| tmp_addr[1] = addr >> 4*8; |
| tmp_addr[0] = addr >> 5*8; |
| |
| val += inc; |
| |
| list_for_each_entry(sdata, &local->interfaces, list) { |
| if (memcmp(tmp_addr, sdata->vif.addr, |
| ETH_ALEN) == 0) { |
| used = true; |
| break; |
| } |
| } |
| |
| if (!used) { |
| memcpy(perm_addr, tmp_addr, ETH_ALEN); |
| break; |
| } |
| addr = (start & ~mask) | (val & mask); |
| } while (addr != start); |
| |
| break; |
| } |
| |
| out_unlock: |
| mutex_unlock(&local->iflist_mtx); |
| } |
| |
| static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk) |
| { |
| struct ieee80211_sub_if_data *sdata; |
| |
| sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk); |
| |
| ieee80211_cleanup_sdata_stas(sdata); |
| } |
| |
| int ieee80211_if_add(struct ieee80211_local *local, const char *name, |
| struct wireless_dev **new_wdev, enum nl80211_iftype type, |
| struct vif_params *params) |
| { |
| struct net_device *ndev = NULL; |
| struct ieee80211_sub_if_data *sdata = NULL; |
| int ret, i; |
| int txqs = 1; |
| |
| ASSERT_RTNL(); |
| |
| if (type == NL80211_IFTYPE_P2P_DEVICE) { |
| struct wireless_dev *wdev; |
| |
| sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, |
| GFP_KERNEL); |
| if (!sdata) |
| return -ENOMEM; |
| wdev = &sdata->wdev; |
| |
| sdata->dev = NULL; |
| strlcpy(sdata->name, name, IFNAMSIZ); |
| ieee80211_assign_perm_addr(local, wdev->address, type); |
| memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); |
| } else { |
| if (local->hw.queues >= IEEE80211_NUM_ACS) |
| txqs = IEEE80211_NUM_ACS; |
| |
| ndev = alloc_netdev_mqs(sizeof(*sdata) + |
| local->hw.vif_data_size, |
| name, ieee80211_if_setup, txqs, 1); |
| if (!ndev) |
| return -ENOMEM; |
| dev_net_set(ndev, wiphy_net(local->hw.wiphy)); |
| |
| 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) { |
| free_netdev(ndev); |
| return ret; |
| } |
| |
| ieee80211_assign_perm_addr(local, ndev->perm_addr, type); |
| memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); |
| SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); |
| |
| /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ |
| sdata = netdev_priv(ndev); |
| ndev->ieee80211_ptr = &sdata->wdev; |
| memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); |
| memcpy(sdata->name, ndev->name, IFNAMSIZ); |
| |
| sdata->dev = ndev; |
| } |
| |
| /* initialise type-independent data */ |
| sdata->wdev.wiphy = local->hw.wiphy; |
| sdata->local = local; |
| |
| for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) |
| skb_queue_head_init(&sdata->fragments[i].skb_list); |
| |
| INIT_LIST_HEAD(&sdata->key_list); |
| |
| spin_lock_init(&sdata->cleanup_stations_lock); |
| INIT_LIST_HEAD(&sdata->cleanup_stations); |
| INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk); |
| INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, |
| ieee80211_dfs_cac_timer_work); |
| INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, |
| ieee80211_delayed_tailroom_dec); |
| |
| for (i = 0; i < IEEE80211_NUM_BANDS; i++) { |
| struct ieee80211_supported_band *sband; |
| sband = local->hw.wiphy->bands[i]; |
| sdata->rc_rateidx_mask[i] = |
| sband ? (1 << sband->n_bitrates) - 1 : 0; |
| if (sband) |
| memcpy(sdata->rc_rateidx_mcs_mask[i], |
| sband->ht_cap.mcs.rx_mask, |
| sizeof(sdata->rc_rateidx_mcs_mask[i])); |
| else |
| memset(sdata->rc_rateidx_mcs_mask[i], 0, |
| sizeof(sdata->rc_rateidx_mcs_mask[i])); |
| } |
| |
| ieee80211_set_default_queues(sdata); |
| |
| sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; |
| sdata->user_power_level = local->user_power_level; |
| |
| /* setup type-dependent data */ |
| ieee80211_setup_sdata(sdata, type); |
| |
| if (ndev) { |
| if (params) { |
| ndev->ieee80211_ptr->use_4addr = params->use_4addr; |
| if (type == NL80211_IFTYPE_STATION) |
| sdata->u.mgd.use_4addr = params->use_4addr; |
| } |
| |
| ndev->features |= local->hw.netdev_features; |
| |
| ret = register_netdevice(ndev); |
| if (ret) { |
| free_netdev(ndev); |
| return ret; |
| } |
| } |
| |
| mutex_lock(&local->iflist_mtx); |
| list_add_tail_rcu(&sdata->list, &local->interfaces); |
| mutex_unlock(&local->iflist_mtx); |
| |
| if (new_wdev) |
| *new_wdev = &sdata->wdev; |
| |
| return 0; |
| } |
| |
| void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) |
| { |
| ASSERT_RTNL(); |
| |
| mutex_lock(&sdata->local->iflist_mtx); |
| list_del_rcu(&sdata->list); |
| mutex_unlock(&sdata->local->iflist_mtx); |
| |
| synchronize_rcu(); |
| |
| if (sdata->dev) { |
| unregister_netdevice(sdata->dev); |
| } else { |
| cfg80211_unregister_wdev(&sdata->wdev); |
| kfree(sdata); |
| } |
| } |
| |
| void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) |
| { |
| if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) |
| return; |
| ieee80211_do_stop(sdata, true); |
| ieee80211_teardown_sdata(sdata); |
| } |
| |
| /* |
| * 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; |
| LIST_HEAD(unreg_list); |
| LIST_HEAD(wdev_list); |
| |
| ASSERT_RTNL(); |
| |
| mutex_lock(&local->iflist_mtx); |
| list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { |
| list_del(&sdata->list); |
| |
| if (sdata->dev) |
| unregister_netdevice_queue(sdata->dev, &unreg_list); |
| else |
| list_add(&sdata->list, &wdev_list); |
| } |
| mutex_unlock(&local->iflist_mtx); |
| unregister_netdevice_many(&unreg_list); |
| list_del(&unreg_list); |
| |
| list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { |
| list_del(&sdata->list); |
| cfg80211_unregister_wdev(&sdata->wdev); |
| kfree(sdata); |
| } |
| } |
| |
| static int netdev_notify(struct notifier_block *nb, |
| unsigned long state, |
| void *ndev) |
| { |
| struct net_device *dev = ndev; |
| struct ieee80211_sub_if_data *sdata; |
| |
| if (state != NETDEV_CHANGENAME) |
| return 0; |
| |
| if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) |
| return 0; |
| |
| if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) |
| return 0; |
| |
| sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| |
| memcpy(sdata->name, dev->name, IFNAMSIZ); |
| |
| ieee80211_debugfs_rename_netdev(sdata); |
| return 0; |
| } |
| |
| static struct notifier_block mac80211_netdev_notifier = { |
| .notifier_call = netdev_notify, |
| }; |
| |
| int ieee80211_iface_init(void) |
| { |
| return register_netdevice_notifier(&mac80211_netdev_notifier); |
| } |
| |
| void ieee80211_iface_exit(void) |
| { |
| unregister_netdevice_notifier(&mac80211_netdev_notifier); |
| } |