diff options
Diffstat (limited to 'net/mac80211/iface.c')
| -rw-r--r-- | net/mac80211/iface.c | 2601 |
1 files changed, 2601 insertions, 0 deletions
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c new file mode 100644 index 000000000..889c32fd8 --- /dev/null +++ b/net/mac80211/iface.c @@ -0,0 +1,2601 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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> + * Copyright 2013-2014 Intel Mobile Communications GmbH + * Copyright (c) 2016 Intel Deutschland GmbH + * Copyright (C) 2018-2026 Intel Corporation + */ +#include <linux/slab.h> +#include <linux/kernel.h> +#include <linux/if_arp.h> +#include <linux/netdevice.h> +#include <linux/rtnetlink.h> +#include <linux/kcov.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 *and* wiphy mutex + * *and* iflist_mtx + * (2) 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 wiphy mutex, the iflist_mtx or RCU. + */ + +static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work); + +bool __ieee80211_recalc_txpower(struct ieee80211_link_data *link) +{ + struct ieee80211_chanctx_conf *chanctx_conf; + int power; + + rcu_read_lock(); + chanctx_conf = rcu_dereference(link->conf->chanctx_conf); + if (!chanctx_conf) { + rcu_read_unlock(); + return false; + } + + power = ieee80211_chandef_max_power(&chanctx_conf->def); + rcu_read_unlock(); + + if (link->user_power_level != IEEE80211_UNSET_POWER_LEVEL) + power = min(power, link->user_power_level); + + if (link->ap_power_level != IEEE80211_UNSET_POWER_LEVEL) + power = min(power, link->ap_power_level); + + if (power != link->conf->txpower) { + link->conf->txpower = power; + return true; + } + + return false; +} + +void ieee80211_recalc_txpower(struct ieee80211_link_data *link, + bool update_bss) +{ + if (__ieee80211_recalc_txpower(link) || + (update_bss && ieee80211_sdata_running(link->sdata))) + ieee80211_link_info_change_notify(link->sdata, link, + 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, false); + + local->hw.conf.flags |= IEEE80211_CONF_IDLE; + return IEEE80211_CONF_CHANGE_IDLE; +} + +static u32 __ieee80211_recalc_idle(struct ieee80211_local *local, + bool force_active) +{ + bool working, scanning, active; + unsigned int led_trig_start = 0, led_trig_stop = 0; + struct ieee80211_sub_if_data *iter; + + lockdep_assert_wiphy(local->hw.wiphy); + + active = force_active || + !list_empty(&local->chanctx_list) || + local->monitors; + + working = !local->ops->remain_on_channel && + !list_empty(&local->roc_list); + + list_for_each_entry(iter, &local->interfaces, list) { + if (iter->vif.type == NL80211_IFTYPE_NAN && + iter->u.nan.started) { + 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) + return __ieee80211_idle_off(local); + return __ieee80211_idle_on(local); +} + +u32 ieee80211_idle_off(struct ieee80211_local *local) +{ + return __ieee80211_recalc_idle(local, true); +} + +void ieee80211_recalc_idle(struct ieee80211_local *local) +{ + u32 change = __ieee80211_recalc_idle(local, false); + if (change) + ieee80211_hw_config(local, -1, change); +} + +static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, + bool check_dup) +{ + struct ieee80211_local *local = sdata->local; + struct ieee80211_sub_if_data *iter; + u64 new, mask, tmp; + u8 *m; + int ret = 0; + + lockdep_assert_wiphy(local->hw.wiphy); + + 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); + + if (!check_dup) + return ret; + + list_for_each_entry(iter, &local->interfaces, list) { + if (iter == sdata) + continue; + + if (iter->vif.type == NL80211_IFTYPE_MONITOR && + !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE)) + continue; + + m = iter->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; + } + } + + return ret; +} + +static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata) +{ + struct ieee80211_roc_work *roc; + struct ieee80211_local *local = sdata->local; + struct ieee80211_sub_if_data *scan_sdata; + int ret = 0; + + lockdep_assert_wiphy(local->hw.wiphy); + + /* To be the most flexible here we want to only limit changing the + * address if the specific interface is doing offchannel work or + * scanning. + */ + if (netif_carrier_ok(sdata->dev)) + return -EBUSY; + + /* if any stations are set known (so they know this vif too), reject */ + if (sta_info_get_by_idx(sdata, 0)) + return -EBUSY; + + /* First check no ROC work is happening on this iface */ + list_for_each_entry(roc, &local->roc_list, list) { + if (roc->sdata != sdata) + continue; + + if (roc->started) { + ret = -EBUSY; + goto unlock; + } + } + + /* And if this iface is scanning */ + if (local->scanning) { + scan_sdata = rcu_dereference_protected(local->scan_sdata, + lockdep_is_held(&local->hw.wiphy->mtx)); + if (sdata == scan_sdata) + ret = -EBUSY; + } + + /* + * More interface types could be added here but changing the + * address while powered makes the most sense in client modes. + */ + switch (sdata->vif.type) { + case NL80211_IFTYPE_STATION: + case NL80211_IFTYPE_P2P_CLIENT: + /* refuse while connecting */ + if (sdata->u.mgd.auth_data || sdata->u.mgd.assoc_data) + return -EBUSY; + break; + default: + ret = -EOPNOTSUPP; + } + +unlock: + return ret; +} + +static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata, + void *addr) +{ + struct ieee80211_local *local = sdata->local; + struct sockaddr *sa = addr; + bool check_dup = true; + bool live = false; + int ret; + + if (ieee80211_sdata_running(sdata)) { + ret = ieee80211_can_powered_addr_change(sdata); + if (ret) + return ret; + + live = true; + } + + if (sdata->vif.type == NL80211_IFTYPE_MONITOR && + !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) + check_dup = false; + + ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); + if (ret) + return ret; + + if (live) + drv_remove_interface(local, sdata); + ret = eth_mac_addr(sdata->dev, sa); + + if (ret == 0) { + memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); + ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); + } + + /* Regardless of eth_mac_addr() return we still want to add the + * interface back. This should not fail... + */ + if (live) + WARN_ON(drv_add_interface(local, sdata)); + + 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 ieee80211_local *local = sdata->local; + + /* + * This happens during unregistration if there's a bond device + * active (maybe other cases?) and we must get removed from it. + * But we really don't care anymore if it's not registered now. + */ + if (!dev->ieee80211_ptr->registered) + return 0; + + guard(wiphy)(local->hw.wiphy); + + return _ieee80211_change_mac(sdata, addr); +} + +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_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(); + lockdep_assert_wiphy(local->hw.wiphy); + + /* 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)) { + struct ieee80211_link_data *link; + + /* + * Only OCB and monitor mode may coexist + */ + if ((sdata->vif.type == NL80211_IFTYPE_OCB && + nsdata->vif.type != NL80211_IFTYPE_MONITOR) || + (sdata->vif.type != NL80211_IFTYPE_MONITOR && + nsdata->vif.type == NL80211_IFTYPE_OCB)) + return -EBUSY; + + /* + * A NAN DATA interface is correlated to the NAN + * (management) one + */ + if (iftype == NL80211_IFTYPE_NAN_DATA && + nsdata->vif.type == NL80211_IFTYPE_NAN) { + if (!nsdata->u.nan.started) + return -EINVAL; + rcu_assign_pointer(sdata->u.nan_data.nmi, 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; + /* + * will not add another interface while any channel + * switch is active. + */ + for_each_link_data(nsdata, link) { + if (link->conf->csa_active) + 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 ieee80211_check_combinations(sdata, NULL, 0, 0, -1); +} + +static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, + enum nl80211_iftype iftype) +{ + int n_queues = sdata->local->hw.queues; + int i; + + if (iftype == NL80211_IFTYPE_NAN) + return 0; + + if (iftype != 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 ((iftype != NL80211_IFTYPE_AP && + iftype != NL80211_IFTYPE_P2P_GO && + iftype != NL80211_IFTYPE_MESH_POINT) || + !ieee80211_hw_check(&sdata->local->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; +} + +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; + + guard(wiphy)(sdata->local->hw.wiphy); + + 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; + struct ieee80211_sub_if_data *iter; + unsigned long flags; + struct sk_buff_head freeq; + struct sk_buff *skb, *tmp; + u32 hw_reconf_flags = 0; + int i, flushed; + struct ps_data *ps; + struct cfg80211_chan_def chandef; + bool cancel_scan; + struct cfg80211_nan_func *func; + + lockdep_assert_wiphy(local->hw.wiphy); + + clear_bit(SDATA_STATE_RUNNING, &sdata->state); + synchronize_rcu(); /* flush _ieee80211_wake_txqs() */ + + cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; + if (cancel_scan) + ieee80211_scan_cancel(local); + + ieee80211_roc_purge(local, sdata); + + switch (sdata->vif.type) { + case NL80211_IFTYPE_STATION: + ieee80211_mgd_stop(sdata); + break; + case NL80211_IFTYPE_ADHOC: + ieee80211_ibss_stop(sdata); + break; + case NL80211_IFTYPE_MONITOR: + list_del_rcu(&sdata->u.mntr.list); + break; + case NL80211_IFTYPE_AP_VLAN: + ieee80211_apvlan_link_clear(sdata); + break; + default: + break; + } + + /* + * 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!) + * + * For AP_VLANs, NAN and NAN_DATA stations may exist since there's + * nothing else that would have removed them, but in other modes there + * shouldn't be any stations. + */ + flushed = sta_info_flush(sdata, -1); + WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && + sdata->vif.type != NL80211_IFTYPE_NAN && + sdata->vif.type != NL80211_IFTYPE_NAN_DATA && flushed > 0); + + /* don't count this interface for allmulti while it is down */ + if (sdata->flags & IEEE80211_SDATA_ALLMULTI) + atomic_dec(&local->iff_allmultis); + + 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); + } + + timer_delete_sync(&local->dynamic_ps_timer); + wiphy_work_cancel(local->hw.wiphy, &local->dynamic_ps_enable_work); + + WARN(ieee80211_vif_is_mld(&sdata->vif), + "destroying interface with valid links 0x%04x\n", + sdata->vif.valid_links); + + sdata->vif.bss_conf.csa_active = false; + if (sdata->vif.type == NL80211_IFTYPE_STATION) + sdata->deflink.u.mgd.csa.waiting_bcn = false; + ieee80211_vif_unblock_queues_csa(sdata); + + wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa.finalize_work); + wiphy_work_cancel(local->hw.wiphy, + &sdata->deflink.color_change_finalize_work); + wiphy_hrtimer_work_cancel(local->hw.wiphy, + &sdata->deflink.dfs_cac_timer_work); + + if (sdata->wdev.links[0].cac_started) { + chandef = sdata->vif.bss_conf.chanreq.oper; + WARN_ON(local->suspended); + ieee80211_link_release_channel(&sdata->deflink); + cfg80211_cac_event(sdata->dev, &chandef, + NL80211_RADAR_CAC_ABORTED, + GFP_KERNEL, 0); + } + + if (sdata->vif.type == NL80211_IFTYPE_AP) { + 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 */ + __skb_queue_head_init(&freeq); + 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--; + __skb_queue_tail(&freeq, skb); + } + } + spin_unlock_irqrestore(&ps->bc_buf.lock, flags); + + skb_queue_walk_safe(&freeq, skb, tmp) { + __skb_unlink(skb, &freeq); + ieee80211_free_txskb(&local->hw, skb); + } + } + + if (going_down) + local->open_count--; + + switch (sdata->vif.type) { + case NL80211_IFTYPE_AP_VLAN: + list_del(&sdata->u.vlan.list); + RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL); + /* see comment in the default case below */ + ieee80211_free_keys(sdata, true); + /* increased by AP value on ifup, so reset on ifdown */ + sdata->crypto_tx_tailroom_needed_cnt = 0; + /* no need to tell driver */ + break; + case NL80211_IFTYPE_MONITOR: + local->monitors--; + + if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) && + !ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { + + local->virt_monitors--; + if (local->virt_monitors == 0) { + local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; + hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; + } + + ieee80211_adjust_monitor_flags(sdata, -1); + } + break; + case NL80211_IFTYPE_NAN: + /* Check if any open NAN_DATA interfaces */ + list_for_each_entry(iter, &local->interfaces, list) { + WARN_ON(iter->vif.type == NL80211_IFTYPE_NAN_DATA && + ieee80211_sdata_running(iter)); + } + + /* clean all the functions */ + if (!(local->hw.wiphy->nan_capa.flags & + WIPHY_NAN_FLAGS_USERSPACE_DE)) { + spin_lock_bh(&sdata->u.nan.de.func_lock); + + idr_for_each_entry(&sdata->u.nan.de.function_inst_ids, + func, i) { + idr_remove(&sdata->u.nan.de.function_inst_ids, i); + cfg80211_free_nan_func(func); + } + idr_destroy(&sdata->u.nan.de.function_inst_ids); + + spin_unlock_bh(&sdata->u.nan.de.func_lock); + } + + /* + * Free the remaining keys that might be associated with the + * NAN interface, e.g., IGTK and BIGTK used for Tx. + */ + ieee80211_free_keys(sdata, true); + break; + case NL80211_IFTYPE_NAN_DATA: + RCU_INIT_POINTER(sdata->u.nan_data.nmi, NULL); + fallthrough; + default: + wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work); + /* + * When we get here, the interface is marked down. + * Free the remaining keys, if there are any + * (which can happen in AP mode if userspace sets + * keys before the interface is operating) + * + * Force the key freeing to always synchronize_net() + * to wait for the RX path in case it is using this + * interface enqueuing frames at this very time on + * another CPU. + */ + ieee80211_free_keys(sdata, true); + skb_queue_purge(&sdata->skb_queue); + skb_queue_purge(&sdata->status_queue); + } + + /* + * Since ieee80211_free_txskb() may issue __dev_queue_xmit() + * which should be called with interrupts enabled, reclamation + * is done in two phases: + */ + __skb_queue_head_init(&freeq); + + /* unlink from local queues... */ + 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]); + __skb_queue_tail(&freeq, skb); + } + } + } + spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); + + /* ... and perform actual reclamation with interrupts enabled. */ + skb_queue_walk_safe(&freeq, skb, tmp) { + __skb_unlink(skb, &freeq); + ieee80211_free_txskb(&local->hw, skb); + } + + if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) + ieee80211_txq_remove_vlan(local, sdata); + + if (sdata->vif.txq) + ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); + + if (sdata->vif.txq_mgmt) + ieee80211_txq_purge(sdata->local, + to_txq_info(sdata->vif.txq_mgmt)); + + sdata->bss = NULL; + + if (local->open_count == 0) + ieee80211_clear_tx_pending(local); + + sdata->vif.bss_conf.beacon_int = 0; + + /* + * If the interface goes down while suspended, presumably because + * the device was unplugged and that happens before our resume, + * then the driver is already unconfigured and the remainder of + * this function isn't needed. + * XXX: what about WoWLAN? If the device has software state, e.g. + * memory allocated, it might expect teardown commands from + * mac80211 here? + */ + if (local->suspended) { + WARN_ON(local->wowlan); + WARN_ON(rcu_access_pointer(local->monitor_sdata)); + return; + } + + switch (sdata->vif.type) { + case NL80211_IFTYPE_AP_VLAN: + break; + case NL80211_IFTYPE_MONITOR: + if (local->virt_monitors == 0) + ieee80211_del_virtual_monitor(local); + + ieee80211_recalc_idle(local); + ieee80211_recalc_offload(local); + + if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) && + !ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) + break; + + ieee80211_link_release_channel(&sdata->deflink); + fallthrough; + default: + if (!going_down) + break; + drv_remove_interface(local, sdata); + + /* Clear private driver data to prevent reuse */ + memset(sdata->vif.drv_priv, 0, local->hw.vif_data_size); + } + + ieee80211_recalc_ps(local); + + if (cancel_scan) + wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work); + + if (local->open_count == 0) { + ieee80211_stop_device(local, false); + + /* no reconfiguring after stop! */ + return; + } + + /* do after stop to avoid reconfiguring when we stop anyway */ + ieee80211_configure_filter(local); + ieee80211_hw_config(local, -1, hw_reconf_flags); + + /* Passing NULL means an interface is picked for configuration */ + if (local->virt_monitors == local->open_count) + ieee80211_add_virtual_monitor(local, NULL); +} + +void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata) +{ + struct ieee80211_sub_if_data *tx_sdata; + struct ieee80211_bss_conf *link_conf, *tx_bss_conf; + struct ieee80211_link_data *tx_link, *link; + unsigned int link_id; + + lockdep_assert_wiphy(sdata->local->hw.wiphy); + + /* Check if any of the links of current sdata is an MBSSID. */ + for_each_vif_active_link(&sdata->vif, link_conf, link_id) { + tx_bss_conf = sdata_dereference(link_conf->tx_bss_conf, sdata); + if (!tx_bss_conf) + continue; + + tx_sdata = vif_to_sdata(tx_bss_conf->vif); + RCU_INIT_POINTER(link_conf->tx_bss_conf, NULL); + + /* If we are not tx sdata reset tx sdata's tx_bss_conf to avoid recusrion + * while closing tx sdata at the end of outer loop below. + */ + if (sdata != tx_sdata) { + tx_link = sdata_dereference(tx_sdata->link[tx_bss_conf->link_id], + tx_sdata); + if (!tx_link) + continue; + + RCU_INIT_POINTER(tx_link->conf->tx_bss_conf, NULL); + } + + /* loop through sdatas to find if any of their links + * belong to same MBSSID set as the one getting deleted. + */ + for_each_sdata_link(tx_sdata->local, link) { + struct ieee80211_sub_if_data *link_sdata = link->sdata; + + if (link_sdata == sdata || link_sdata == tx_sdata || + rcu_access_pointer(link->conf->tx_bss_conf) != tx_bss_conf) + continue; + + RCU_INIT_POINTER(link->conf->tx_bss_conf, NULL); + + /* Remove all links of matching MLD until dynamic link + * removal can be supported. + */ + cfg80211_stop_iface(link_sdata->wdev.wiphy, &link_sdata->wdev, + GFP_KERNEL); + } + + /* If we are not tx sdata, remove links of tx sdata and proceed */ + if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) + cfg80211_stop_iface(tx_sdata->wdev.wiphy, + &tx_sdata->wdev, GFP_KERNEL); + } +} + +static int ieee80211_stop(struct net_device *dev) +{ + struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); + + /* close dependent VLAN interfaces before locking wiphy */ + if (sdata->vif.type == NL80211_IFTYPE_AP) { + struct ieee80211_sub_if_data *vlan, *tmpsdata; + + list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, + u.vlan.list) + dev_close(vlan->dev); + } + + guard(wiphy)(sdata->local->hw.wiphy); + + wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work); + + /* Close the dependent MBSSID interfaces with wiphy lock as we may be + * terminating its partner links too in case of MLD. + */ + if (sdata->vif.type == NL80211_IFTYPE_AP) + ieee80211_stop_mbssid(sdata); + + 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, sdata_allmulti; + + allmulti = !!(dev->flags & IFF_ALLMULTI); + sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); + + 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; + } + + spin_lock_bh(&local->filter_lock); + __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); + spin_unlock_bh(&local->filter_lock); + wiphy_work_queue(local->hw.wiphy, &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) +{ + if (WARN_ON(!list_empty(&sdata->work.entry))) + wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work); + + /* free extra data */ + ieee80211_free_keys(sdata, false); + + ieee80211_debugfs_remove_netdev(sdata); + + ieee80211_destroy_frag_cache(&sdata->frags); + + if (ieee80211_vif_is_mesh(&sdata->vif)) + ieee80211_mesh_teardown_sdata(sdata); + + ieee80211_vif_clear_links(sdata); + ieee80211_link_stop(&sdata->deflink); + + if (sdata->vif.type == NL80211_IFTYPE_NAN) { + struct ieee80211_nan_sched_cfg *nan_sched = + &sdata->vif.cfg.nan_sched; + + for (int i = 0; i < ARRAY_SIZE(nan_sched->channels); i++) + WARN_ON(nan_sched->channels[i].chanreq.oper.chan); + } +} + +/* + * The netdev can be unregistered without mac80211 doing it, e.g. by the netdev + * core when cfg80211 couldn't move it out of a network namespace that's being + * destroyed. Drop it from the interface list either way. + */ +static void ieee80211_unlist_sdata(struct ieee80211_sub_if_data *sdata) +{ + struct ieee80211_local *local = sdata->local; + struct ieee80211_sub_if_data *iter; + + ASSERT_RTNL(); + + list_for_each_entry(iter, &local->interfaces, list) { + if (iter != sdata) + continue; + guard(mutex)(&local->iflist_mtx); + list_del_rcu(&sdata->list); + return; + } +} + +static void ieee80211_uninit(struct net_device *dev) +{ + struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); + + ieee80211_unlist_sdata(sdata); + ieee80211_teardown_sdata(sdata); +} + +static int ieee80211_netdev_setup_tc(struct net_device *dev, + enum tc_setup_type type, void *type_data) +{ + struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); + struct ieee80211_local *local = sdata->local; + + if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) + return -EOPNOTSUPP; + + return drv_net_setup_tc(local, sdata, dev, type, type_data); +} + +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_set_mac_address = ieee80211_change_mac, + .ndo_setup_tc = ieee80211_netdev_setup_tc, +}; + +static u16 ieee80211_monitor_select_queue(struct net_device *dev, + struct sk_buff *skb, + struct net_device *sb_dev) +{ + struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); + struct ieee80211_local *local = sdata->local; + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + struct ieee80211_hdr *hdr; + int len_rthdr; + + if (local->hw.queues < IEEE80211_NUM_ACS) + return 0; + + /* reset flags and info before parsing radiotap header */ + memset(info, 0, sizeof(*info)); + + if (!ieee80211_parse_tx_radiotap(skb, dev, NULL)) + return 0; /* doesn't matter, frame will be dropped */ + + len_rthdr = ieee80211_get_radiotap_len(skb->data); + hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); + if (skb->len < len_rthdr + 2 || + skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) + return 0; /* doesn't matter, frame will be dropped */ + + 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_set_mac_address = ieee80211_change_mac, + .ndo_select_queue = ieee80211_monitor_select_queue, +}; + +static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx, + struct net_device_path *path) +{ + struct ieee80211_sub_if_data *sdata; + struct ieee80211_local *local; + struct sta_info *sta; + int ret = -ENOENT; + + sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev); + local = sdata->local; + + if (!local->ops->net_fill_forward_path) + return -EOPNOTSUPP; + + rcu_read_lock(); + switch (sdata->vif.type) { + case NL80211_IFTYPE_AP_VLAN: + sta = rcu_dereference(sdata->u.vlan.sta); + if (sta) + break; + if (sdata->wdev.use_4addr) + goto out; + if (is_multicast_ether_addr(ctx->daddr)) + goto out; + sta = sta_info_get_bss(sdata, ctx->daddr); + break; + case NL80211_IFTYPE_AP: + if (is_multicast_ether_addr(ctx->daddr)) + goto out; + sta = sta_info_get(sdata, ctx->daddr); + break; + case NL80211_IFTYPE_STATION: + if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { + sta = sta_info_get(sdata, ctx->daddr); + if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { + if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) + goto out; + + break; + } + } + + sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); + break; + default: + goto out; + } + + if (!sta) + goto out; + + ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path); +out: + rcu_read_unlock(); + + return ret; +} + +static const struct net_device_ops ieee80211_dataif_8023_ops = { + .ndo_open = ieee80211_open, + .ndo_stop = ieee80211_stop, + .ndo_uninit = ieee80211_uninit, + .ndo_start_xmit = ieee80211_subif_start_xmit_8023, + .ndo_set_rx_mode = ieee80211_set_multicast_list, + .ndo_set_mac_address = ieee80211_change_mac, + .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, + .ndo_setup_tc = ieee80211_netdev_setup_tc, +}; + +static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype) +{ + switch (iftype) { + /* P2P GO and client are mapped to AP/STATION types */ + case NL80211_IFTYPE_AP: + case NL80211_IFTYPE_STATION: + return true; + default: + return false; + } +} + +static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) +{ + struct ieee80211_local *local = sdata->local; + u32 flags; + + flags = sdata->vif.offload_flags; + + if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && + ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { + flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; + + if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && + local->hw.wiphy->frag_threshold != (u32)-1) + flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; + + if (local->virt_monitors) + flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; + } else { + flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; + } + + if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) && + ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { + flags |= IEEE80211_OFFLOAD_DECAP_ENABLED; + + if (local->virt_monitors && + !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP)) + flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; + } else { + flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; + } + + if (sdata->vif.offload_flags == flags) + return false; + + sdata->vif.offload_flags = flags; + ieee80211_check_fast_rx_iface(sdata); + return true; +} + +static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) +{ + struct ieee80211_local *local = sdata->local; + struct ieee80211_sub_if_data *bss = sdata; + bool enabled; + + if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { + if (!sdata->bss) + return; + + bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); + } + + if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || + !ieee80211_iftype_supports_hdr_offload(bss->vif.type)) + return; + + enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; + if (sdata->wdev.use_4addr && + !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) + enabled = false; + + sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : + &ieee80211_dataif_ops; +} + +static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) +{ + struct ieee80211_local *local = sdata->local; + struct ieee80211_sub_if_data *vsdata; + + if (ieee80211_set_sdata_offload_flags(sdata)) { + drv_update_vif_offload(local, sdata); + ieee80211_set_vif_encap_ops(sdata); + } + + list_for_each_entry(vsdata, &local->interfaces, list) { + if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || + vsdata->bss != &sdata->u.ap) + continue; + + ieee80211_set_vif_encap_ops(vsdata); + } +} + +void ieee80211_recalc_offload(struct ieee80211_local *local) +{ + struct ieee80211_sub_if_data *sdata; + + if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) + return; + + lockdep_assert_wiphy(local->hw.wiphy); + + list_for_each_entry(sdata, &local->interfaces, list) { + if (!ieee80211_sdata_running(sdata)) + continue; + + ieee80211_recalc_sdata_offload(sdata); + } +} + +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); + if (!(flags & MONITOR_FLAG_SKIP_TX)) + local->tx_mntrs += offset; + +#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 (ieee80211_hw_check(&local->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 void ieee80211_sdata_init(struct ieee80211_local *local, + struct ieee80211_sub_if_data *sdata) +{ + sdata->local = local; + + INIT_LIST_HEAD(&sdata->key_list); + + /* + * Initialize the default link, so we can use link_id 0 for non-MLD, + * and that continues to work for non-MLD-aware drivers that use just + * vif.bss_conf instead of vif.link_conf. + * + * Note that we never change this, so if link ID 0 isn't used in an + * MLD connection, we get a separate allocation for it. + */ + ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf); +} + +int ieee80211_add_virtual_monitor(struct ieee80211_local *local, + struct ieee80211_sub_if_data *creator_sdata) +{ + struct ieee80211_sub_if_data *sdata; + int ret; + + ASSERT_RTNL(); + lockdep_assert_wiphy(local->hw.wiphy); + + if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) + return 0; + + /* Already have a monitor set up, configure it */ + sdata = wiphy_dereference(local->hw.wiphy, local->monitor_sdata); + if (sdata) + goto configure_monitor; + + sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); + if (!sdata) + return -ENOMEM; + + /* set up data */ + sdata->vif.type = NL80211_IFTYPE_MONITOR; + snprintf(sdata->name, IFNAMSIZ, "%s-monitor", + wiphy_name(local->hw.wiphy)); + sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; + sdata->wdev.wiphy = local->hw.wiphy; + + ieee80211_sdata_init(local, sdata); + + ieee80211_set_default_queues(sdata); + + if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { + ret = drv_add_interface(local, sdata); + if (WARN_ON(ret)) { + /* ok .. stupid driver, it asked for this! */ + kfree(sdata); + return ret; + } + } + + ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); + if (ret) { + kfree(sdata); + return ret; + } + + set_bit(SDATA_STATE_RUNNING, &sdata->state); + + mutex_lock(&local->iflist_mtx); + rcu_assign_pointer(local->monitor_sdata, sdata); + mutex_unlock(&local->iflist_mtx); + + ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chanreq, + IEEE80211_CHANCTX_EXCLUSIVE); + if (ret) { + mutex_lock(&local->iflist_mtx); + RCU_INIT_POINTER(local->monitor_sdata, NULL); + mutex_unlock(&local->iflist_mtx); + synchronize_net(); + drv_remove_interface(local, sdata); + clear_bit(SDATA_STATE_RUNNING, &sdata->state); + kfree(sdata); + return ret; + } + + skb_queue_head_init(&sdata->skb_queue); + skb_queue_head_init(&sdata->status_queue); + wiphy_work_init(&sdata->work, ieee80211_iface_work); + +configure_monitor: + /* Copy in the MU-MIMO configuration if set */ + if (!creator_sdata) { + struct ieee80211_sub_if_data *other; + + list_for_each_entry_rcu(other, &local->mon_list, u.mntr.list) { + if (!other->vif.bss_conf.mu_mimo_owner) + continue; + + creator_sdata = other; + break; + } + } + + if (creator_sdata && creator_sdata->vif.bss_conf.mu_mimo_owner) { + sdata->vif.bss_conf.mu_mimo_owner = true; + memcpy(&sdata->vif.bss_conf.mu_group, + &creator_sdata->vif.bss_conf.mu_group, + sizeof(sdata->vif.bss_conf.mu_group)); + memcpy(&sdata->u.mntr.mu_follow_addr, + creator_sdata->u.mntr.mu_follow_addr, ETH_ALEN); + + ieee80211_link_info_change_notify(sdata, &sdata->deflink, + BSS_CHANGED_MU_GROUPS); + } + + return 0; +} + +void ieee80211_del_virtual_monitor(struct ieee80211_local *local) +{ + struct ieee80211_sub_if_data *sdata; + + if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) + return; + + ASSERT_RTNL(); + lockdep_assert_wiphy(local->hw.wiphy); + + mutex_lock(&local->iflist_mtx); + + sdata = rcu_dereference_protected(local->monitor_sdata, + lockdep_is_held(&local->iflist_mtx)); + if (!sdata) { + mutex_unlock(&local->iflist_mtx); + return; + } + + clear_bit(SDATA_STATE_RUNNING, &sdata->state); + ieee80211_link_release_channel(&sdata->deflink); + + if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) + drv_remove_interface(local, sdata); + + RCU_INIT_POINTER(local->monitor_sdata, NULL); + mutex_unlock(&local->iflist_mtx); + + synchronize_net(); + + kfree(sdata); +} + +/* + * 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; + u64 changed = 0; + int res; + u32 hw_reconf_flags = 0; + + lockdep_assert_wiphy(local->hw.wiphy); + + switch (sdata->vif.type) { + 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; + sdata->control_port_over_nl80211 = + master->control_port_over_nl80211; + sdata->control_port_no_preauth = + master->control_port_no_preauth; + sdata->vif.cab_queue = master->vif.cab_queue; + memcpy(sdata->vif.hw_queue, master->vif.hw_queue, + sizeof(sdata->vif.hw_queue)); + sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq; + + sdata->crypto_tx_tailroom_needed_cnt += + master->crypto_tx_tailroom_needed_cnt; + + ieee80211_apvlan_link_setup(sdata); + + break; + } + case NL80211_IFTYPE_AP: + case NL80211_IFTYPE_MESH_POINT: + case NL80211_IFTYPE_STATION: + case NL80211_IFTYPE_MONITOR: + case NL80211_IFTYPE_ADHOC: + case NL80211_IFTYPE_P2P_DEVICE: + case NL80211_IFTYPE_OCB: + case NL80211_IFTYPE_NAN: + case NL80211_IFTYPE_PD: + /* no special treatment */ + break; + case NL80211_IFTYPE_NAN_DATA: + if (WARN_ON(!rcu_access_pointer(sdata->u.nan_data.nmi))) + return -ENOLINK; + break; + case NL80211_IFTYPE_UNSPECIFIED: + case NUM_NL80211_IFTYPES: + case NL80211_IFTYPE_P2P_CLIENT: + case NL80211_IFTYPE_P2P_GO: + case NL80211_IFTYPE_WDS: + /* cannot happen */ + WARN_ON(1); + break; + } + + if (local->open_count == 0) { + /* here we can consider everything in good order (again) */ + local->reconfig_failure = false; + + res = drv_start(local); + if (res) { + /* + * no need to worry about AP_VLAN/NAN_DATA cleanup since + * in that case we can't have open_count == 0 + */ + return res; + } + 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)) { + eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); + memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); + + if (!is_valid_ether_addr(dev->dev_addr)) { + res = -EADDRNOTAVAIL; + goto err_stop; + } + } + + sdata->vif.addr_valid = sdata->vif.type != NL80211_IFTYPE_MONITOR || + (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE); + switch (sdata->vif.type) { + case NL80211_IFTYPE_AP_VLAN: + /* no need to tell driver, but set carrier and chanctx */ + if (sdata->bss->active) { + struct ieee80211_link_data *link; + + for_each_link_data(sdata, link) { + ieee80211_link_vlan_copy_chanctx(link); + } + + netif_carrier_on(dev); + ieee80211_set_vif_encap_ops(sdata); + } else { + netif_carrier_off(dev); + } + break; + case NL80211_IFTYPE_MONITOR: + if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || + ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { + res = drv_add_interface(local, sdata); + if (res) + goto err_stop; + } else { + /* add/configure if there is no non-monitor interface */ + if (local->virt_monitors == local->open_count) { + res = ieee80211_add_virtual_monitor(local, sdata); + if (res) + goto err_stop; + } + + local->virt_monitors++; + + /* must be before the call to ieee80211_configure_filter */ + if (local->virt_monitors == 1) { + local->hw.conf.flags |= IEEE80211_CONF_MONITOR; + hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; + } + } + + local->monitors++; + + ieee80211_adjust_monitor_flags(sdata, 1); + ieee80211_configure_filter(local); + ieee80211_recalc_offload(local); + ieee80211_recalc_idle(local); + + netif_carrier_on(dev); + list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); + break; + case NL80211_IFTYPE_AP: + sdata->bss = &sdata->u.ap; + fallthrough; + default: + if (coming_up) { + ieee80211_del_virtual_monitor(local); + ieee80211_set_sdata_offload_flags(sdata); + + res = drv_add_interface(local, sdata); + if (res) + goto err_stop; + + ieee80211_set_vif_encap_ops(sdata); + res = ieee80211_check_queues(sdata, + ieee80211_vif_type_p2p(&sdata->vif)); + 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.probe_req_reg) + drv_config_iface_filter(local, sdata, + FIF_PROBE_REQ, + FIF_PROBE_REQ); + + if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && + sdata->vif.type != NL80211_IFTYPE_NAN && + sdata->vif.type != NL80211_IFTYPE_PD) + changed |= ieee80211_reset_erp_info(sdata); + ieee80211_link_info_change_notify(sdata, &sdata->deflink, + changed); + + switch (sdata->vif.type) { + case NL80211_IFTYPE_STATION: + case NL80211_IFTYPE_ADHOC: + case NL80211_IFTYPE_AP: + case NL80211_IFTYPE_MESH_POINT: + case NL80211_IFTYPE_OCB: + case NL80211_IFTYPE_NAN_DATA: + netif_carrier_off(dev); + break; + case NL80211_IFTYPE_P2P_DEVICE: + case NL80211_IFTYPE_NAN: + case NL80211_IFTYPE_PD: + break; + default: + /* not reached */ + WARN_ON(1); + } + + /* + * Set default queue parameters so drivers don't + * need to initialise the hardware if the hardware + * doesn't start up with sane defaults. + * Enable QoS for anything but station interfaces. + */ + ieee80211_set_wmm_default(&sdata->deflink, true, + sdata->vif.type != NL80211_IFTYPE_STATION); + } + + /* + * 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 (coming_up) + local->open_count++; + + if (local->open_count == 1) + ieee80211_hw_conf_init(local); + else if (hw_reconf_flags) + ieee80211_hw_config(local, -1, hw_reconf_flags); + + ieee80211_recalc_ps(local); + + set_bit(SDATA_STATE_RUNNING, &sdata->state); + + return 0; + err_del_interface: + drv_remove_interface(local, sdata); + err_stop: + if (!local->open_count) { + ieee80211_led_radio(local, false); + ieee80211_mod_tpt_led_trig(local, 0, + IEEE80211_TPT_LEDTRIG_FL_RADIO); + drv_stop(local, false); + } + if (sdata->vif.type == NL80211_IFTYPE_NAN_DATA) + RCU_INIT_POINTER(sdata->u.nan_data.nmi, NULL); + if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) + list_del(&sdata->u.vlan.list); + /* Might not be initialized yet, but it is harmless */ + sdata->bss = NULL; + return res; +} + +static void ieee80211_if_setup(struct net_device *dev) +{ + ether_setup(dev); + dev->priv_flags &= ~IFF_TX_SKB_SHARING; + dev->priv_flags |= IFF_NO_QUEUE; + dev->netdev_ops = &ieee80211_dataif_ops; + dev->needs_free_netdev = true; +} + +static void ieee80211_iface_process_skb(struct ieee80211_local *local, + struct ieee80211_sub_if_data *sdata, + struct sk_buff *skb) +{ + struct ieee80211_mgmt *mgmt = (void *)skb->data; + + lockdep_assert_wiphy(local->hw.wiphy); + + if (ieee80211_is_action(mgmt->frame_control) && + mgmt->u.action.category == WLAN_CATEGORY_BACK) { + struct sta_info *sta; + int len = skb->len; + + sta = sta_info_get_bss(sdata, mgmt->sa); + if (sta) { + switch (mgmt->u.action.action_code) { + case WLAN_ACTION_ADDBA_REQ: + case WLAN_ACTION_NDP_ADDBA_REQ: + ieee80211_process_addba_request(local, sta, + mgmt, len); + break; + case WLAN_ACTION_ADDBA_RESP: + case WLAN_ACTION_NDP_ADDBA_RESP: + ieee80211_process_addba_resp(local, sta, + mgmt, len); + break; + case WLAN_ACTION_DELBA: + case WLAN_ACTION_NDP_DELBA: + ieee80211_process_delba(sdata, sta, + mgmt, len); + break; + default: + WARN_ON(1); + break; + } + } + } else if (ieee80211_is_action(mgmt->frame_control) && + mgmt->u.action.category == WLAN_CATEGORY_HT) { + switch (mgmt->u.action.action_code) { + case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: { + u8 chanwidth = mgmt->u.action.ht_notify_cw.chanwidth; + struct ieee80211_rx_status *status; + struct link_sta_info *link_sta; + struct sta_info *sta; + + sta = sta_info_get_bss(sdata, mgmt->sa); + if (!sta) + break; + + status = IEEE80211_SKB_RXCB(skb); + if (!status->link_valid) + link_sta = &sta->deflink; + else + link_sta = rcu_dereference_protected(sta->link[status->link_id], + lockdep_is_held(&local->hw.wiphy->mtx)); + if (link_sta) + ieee80211_ht_handle_chanwidth_notif(local, sdata, sta, + link_sta, chanwidth, + status->band); + break; + } + default: + WARN_ON(1); + break; + } + } else if (ieee80211_is_action(mgmt->frame_control) && + mgmt->u.action.category == WLAN_CATEGORY_VHT) { + switch (mgmt->u.action.action_code) { + case WLAN_VHT_ACTION_OPMODE_NOTIF: { + struct ieee80211_rx_status *status; + enum nl80211_band band; + struct sta_info *sta; + u8 opmode; + + status = IEEE80211_SKB_RXCB(skb); + band = status->band; + opmode = mgmt->u.action.vht_opmode_notif.operating_mode; + + sta = sta_info_get_bss(sdata, mgmt->sa); + + if (sta) + ieee80211_vht_handle_opmode(sdata, + &sta->deflink, + opmode, band); + + break; + } + case WLAN_VHT_ACTION_GROUPID_MGMT: + ieee80211_process_mu_groups(sdata, &sdata->deflink, + mgmt); + break; + default: + WARN_ON(1); + break; + } + } else if (ieee80211_is_action(mgmt->frame_control) && + mgmt->u.action.category == WLAN_CATEGORY_S1G) { + switch (mgmt->u.action.action_code) { + case WLAN_S1G_TWT_TEARDOWN: + case WLAN_S1G_TWT_SETUP: + ieee80211_s1g_rx_twt_action(sdata, skb); + break; + default: + break; + } + } else if (ieee80211_is_data_qos(mgmt->frame_control)) { + struct ieee80211_hdr *hdr = (void *)mgmt; + struct sta_info *sta; + + /* + * 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. + */ + sta = sta_info_get_bss(sdata, mgmt->sa); + if (sta) { + u16 tid = ieee80211_get_tid(hdr); + + __ieee80211_stop_rx_ba_session( + sta, tid, WLAN_BACK_RECIPIENT, + WLAN_REASON_QSTA_REQUIRE_SETUP, + true); + } + } else switch (sdata->vif.type) { + case NL80211_IFTYPE_AP: + ieee80211_ap_rx_queued_frame(sdata, skb); + break; + case NL80211_IFTYPE_STATION: + ieee80211_sta_rx_queued_frame(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; + } +} + +static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, + struct sk_buff *skb) +{ + struct ieee80211_mgmt *mgmt = (void *)skb->data; + + if (ieee80211_is_action(mgmt->frame_control) && + mgmt->u.action.category == WLAN_CATEGORY_S1G) { + switch (mgmt->u.action.action_code) { + case WLAN_S1G_TWT_TEARDOWN: + case WLAN_S1G_TWT_SETUP: + ieee80211_s1g_status_twt_action(sdata, skb); + break; + default: + break; + } + } +} + +static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *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; + + if (!ieee80211_sdata_running(sdata)) + return; + + if (test_bit(SCAN_SW_SCANNING, &local->scanning)) + return; + + if (!ieee80211_can_run_worker(local)) + return; + + /* first process frames */ + while ((skb = skb_dequeue(&sdata->skb_queue))) { + kcov_remote_start_common(skb_get_kcov_handle(skb)); + + if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) + ieee80211_process_tdls_channel_switch(sdata, skb); + else + ieee80211_iface_process_skb(local, sdata, skb); + + consume_skb(skb); + kcov_remote_stop(); + } + + /* process status queue */ + while ((skb = skb_dequeue(&sdata->status_queue))) { + kcov_remote_start_common(skb_get_kcov_handle(skb)); + + ieee80211_iface_process_status(sdata, skb); + consume_skb(skb); + + kcov_remote_stop(); + } + + /* 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; + case NL80211_IFTYPE_OCB: + ieee80211_ocb_work(sdata); + break; + default: + break; + } +} + +static void ieee80211_activate_links_work(struct wiphy *wiphy, + struct wiphy_work *work) +{ + struct ieee80211_sub_if_data *sdata = + container_of(work, struct ieee80211_sub_if_data, + activate_links_work); + struct ieee80211_local *local = wiphy_priv(wiphy); + + if (local->in_reconfig) + return; + + ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); + sdata->desired_active_links = 0; +} + +/* + * 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) +{ + static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, + 0xff, 0xff, 0xff}; + + /* clear type-dependent unions */ + memset(&sdata->u, 0, sizeof(sdata->u)); + memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.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->control_port_over_nl80211 = false; + sdata->control_port_no_preauth = false; + sdata->vif.cfg.idle = true; + sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ + + 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); + skb_queue_head_init(&sdata->status_queue); + wiphy_work_init(&sdata->work, ieee80211_iface_work); + wiphy_work_init(&sdata->activate_links_work, + ieee80211_activate_links_work); + + switch (type) { + case NL80211_IFTYPE_P2P_GO: + type = NL80211_IFTYPE_AP; + sdata->vif.type = type; + sdata->vif.p2p = true; + fallthrough; + 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; + fallthrough; + case NL80211_IFTYPE_STATION: + sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; + ieee80211_sta_setup_sdata(sdata); + break; + case NL80211_IFTYPE_OCB: + sdata->vif.bss_conf.bssid = bssid_wildcard; + ieee80211_ocb_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_NAN: + if (!(sdata->local->hw.wiphy->nan_capa.flags & + WIPHY_NAN_FLAGS_USERSPACE_DE)) { + idr_init(&sdata->u.nan.de.function_inst_ids); + spin_lock_init(&sdata->u.nan.de.func_lock); + } + sdata->vif.bss_conf.bssid = sdata->vif.addr; + break; + case NL80211_IFTYPE_AP_VLAN: + case NL80211_IFTYPE_P2P_DEVICE: + sdata->vif.bss_conf.bssid = sdata->vif.addr; + break; + case NL80211_IFTYPE_NAN_DATA: + case NL80211_IFTYPE_PD: + break; + case NL80211_IFTYPE_UNSPECIFIED: + case NL80211_IFTYPE_WDS: + case NUM_NL80211_IFTYPES: + WARN_ON(1); + break; + } + + /* need to do this after the switch so vif.type is correct */ + ieee80211_link_setup(&sdata->deflink); + + ieee80211_debugfs_recreate_netdev(sdata, false); +} + +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; + + /* for now, don't support changing while links exist */ + if (ieee80211_vif_is_mld(&sdata->vif)) + return -EBUSY; + + switch (sdata->vif.type) { + case NL80211_IFTYPE_AP: + if (!list_empty(&sdata->u.ap.vlans)) + return -EBUSY; + break; + case NL80211_IFTYPE_STATION: + case NL80211_IFTYPE_ADHOC: + case NL80211_IFTYPE_OCB: + /* + * 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: + case NL80211_IFTYPE_OCB: + /* + * Could probably support everything + * but here. + */ + 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_stop_vif_queues(local, sdata, + IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); + /* do_stop will synchronize_rcu() first thing */ + ieee80211_do_stop(sdata, false); + + ieee80211_teardown_sdata(sdata); + + ieee80211_set_sdata_offload_flags(sdata); + ret = drv_change_interface(local, sdata, internal_type, p2p); + if (ret) + type = ieee80211_vif_type_p2p(&sdata->vif); + + /* + * 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, type); + + ieee80211_setup_sdata(sdata, type); + ieee80211_set_vif_encap_ops(sdata); + + err = ieee80211_do_open(&sdata->wdev, false); + WARN(err, "type change: do_open returned %d", err); + + ieee80211_wake_vif_queues(local, sdata, + IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); + 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 */ + 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; + + lockdep_assert_wiphy(local->hw.wiphy); + + /* 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; + + switch (type) { + case NL80211_IFTYPE_MONITOR: + /* doesn't matter */ + break; + 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 (ieee80211_hw_check(&local->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); + return; + } + } + fallthrough; + 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 (ether_addr_equal(local->hw.wiphy->addresses[i].addr, + sdata->vif.addr)) { + 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; + } + + /* + * Pick address of existing interface in case user changed + * MAC address manually, default to perm_addr. + */ + m = local->hw.wiphy->perm_addr; + list_for_each_entry(sdata, &local->interfaces, list) { + if (sdata->vif.type == NL80211_IFTYPE_MONITOR) + continue; + m = sdata->vif.addr; + break; + } + 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 (ether_addr_equal(tmp_addr, sdata->vif.addr)) { + used = true; + break; + } + } + + if (!used) { + memcpy(perm_addr, tmp_addr, ETH_ALEN); + break; + } + addr = (start & ~mask) | (val & mask); + } while (addr != start); + + break; + } +} + +int ieee80211_if_add(struct ieee80211_local *local, const char *name, + unsigned char name_assign_type, + 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; + struct txq_info *txqi; + int ret, i; + + ASSERT_RTNL(); + lockdep_assert_wiphy(local->hw.wiphy); + + if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { + int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, + sizeof(void *)); + struct wireless_dev *wdev; + int txq_size = 0; + + if (type == NL80211_IFTYPE_NAN) + txq_size = sizeof(struct txq_info) + + local->hw.txq_data_size; + + sdata = kzalloc(size + txq_size, GFP_KERNEL); + if (!sdata) + return -ENOMEM; + wdev = &sdata->wdev; + + sdata->dev = NULL; + strscpy(sdata->name, name, IFNAMSIZ); + + if (is_valid_ether_addr(params->macaddr)) + memcpy(wdev->address, params->macaddr, ETH_ALEN); + else + ieee80211_assign_perm_addr(local, wdev->address, type); + + memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); + ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); + + /* + * Add a management TXQ for NAN devices which includes frames + * that will only be transmitted during discovery windows (DWs) + */ + if (type == NL80211_IFTYPE_NAN) { + txqi = (struct txq_info *)((unsigned long)sdata + size); + ieee80211_txq_init(sdata, NULL, txqi, + IEEE80211_NUM_TIDS); + } + } else { + int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, + sizeof(void *)); + int txq_size = 0; + + if (type != NL80211_IFTYPE_AP_VLAN && + (type != NL80211_IFTYPE_MONITOR || + (params->flags & MONITOR_FLAG_ACTIVE))) + txq_size += sizeof(struct txq_info) + + local->hw.txq_data_size; + + ndev = alloc_netdev_mqs(size + txq_size, + name, name_assign_type, + ieee80211_if_setup, 1, 1); + if (!ndev) + return -ENOMEM; + + dev_net_set(ndev, wiphy_net(local->hw.wiphy)); + + ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; + + 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); + if (is_valid_ether_addr(params->macaddr)) + eth_hw_addr_set(ndev, params->macaddr); + else + eth_hw_addr_set(ndev, ndev->perm_addr); + 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); + ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); + memcpy(sdata->name, ndev->name, IFNAMSIZ); + + if (txq_size) { + txqi = netdev_priv(ndev) + size; + ieee80211_txq_init(sdata, NULL, txqi, 0); + } + + sdata->dev = ndev; + } + + /* initialise type-independent data */ + sdata->wdev.wiphy = local->hw.wiphy; + + ieee80211_sdata_init(local, sdata); + + ieee80211_init_frag_cache(&sdata->frags); + + wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk, + ieee80211_delayed_tailroom_dec); + + for (i = 0; i < NUM_NL80211_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) { + __le16 cap; + u16 *vht_rate_mask; + + memcpy(sdata->rc_rateidx_mcs_mask[i], + sband->ht_cap.mcs.rx_mask, + sizeof(sdata->rc_rateidx_mcs_mask[i])); + + cap = sband->vht_cap.vht_mcs.rx_mcs_map; + vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; + ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); + } else { + memset(sdata->rc_rateidx_mcs_mask[i], 0, + sizeof(sdata->rc_rateidx_mcs_mask[i])); + memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, + sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); + } + } + + ieee80211_set_default_queues(sdata); + + /* setup type-dependent data */ + ieee80211_setup_sdata(sdata, type); + + if (ndev) { + 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; + ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; + ndev->hw_features |= ndev->features & + MAC80211_SUPPORTED_FEATURES_TX; + sdata->vif.netdev_features = local->hw.netdev_features; + + netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); + + /* MTU range is normally 256 - 2304, where the upper limit is + * the maximum MSDU size. Monitor interfaces send and receive + * MPDU and A-MSDU frames which may be much larger so we do + * not impose an upper limit in that case. + */ + ndev->min_mtu = 256; + if (type == NL80211_IFTYPE_MONITOR) + ndev->max_mtu = 0; + else + ndev->max_mtu = local->hw.max_mtu; + + ret = cfg80211_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(); + lockdep_assert_wiphy(sdata->local->hw.wiphy); + + mutex_lock(&sdata->local->iflist_mtx); + list_del_rcu(&sdata->list); + mutex_unlock(&sdata->local->iflist_mtx); + + if (sdata->vif.txq) + ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); + + if (sdata->vif.txq_mgmt) + ieee80211_txq_purge(sdata->local, + to_txq_info(sdata->vif.txq_mgmt)); + + synchronize_rcu(); + + cfg80211_unregister_wdev(&sdata->wdev); + + if (!sdata->dev) { + ieee80211_teardown_sdata(sdata); + 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); +} + +void ieee80211_remove_interfaces(struct ieee80211_local *local) +{ + struct ieee80211_sub_if_data *sdata, *tmp; + LIST_HEAD(unreg_list); + + ASSERT_RTNL(); + + /* Before destroying the interfaces, make sure they're all stopped so + * that the hardware is stopped. Otherwise, the driver might still be + * iterating the interfaces during the shutdown, e.g. from a worker + * or from RX processing or similar, and if it does so (using atomic + * iteration) while we're manipulating the list, the iteration will + * crash. + * + * After this, the hardware should be stopped and the driver should + * have stopped all of its activities, so that we can do RCU-unaware + * manipulations of the interface list below. + */ + cfg80211_shutdown_all_interfaces(local->hw.wiphy); + + guard(wiphy)(local->hw.wiphy); + + WARN(local->open_count, "%s: open count remains %d\n", + wiphy_name(local->hw.wiphy), local->open_count); + + mutex_lock(&local->iflist_mtx); + list_splice_init(&local->interfaces, &unreg_list); + mutex_unlock(&local->iflist_mtx); + + list_for_each_entry_safe(sdata, tmp, &unreg_list, list) { + bool netdev = sdata->dev; + + /* + * Remove IP addresses explicitly, since the notifier will + * skip the callbacks if wdev->registered is false, since + * we can't acquire the wiphy_lock() again there if already + * inside this locked section. + */ + sdata->vif.cfg.arp_addr_cnt = 0; + if (sdata->vif.type == NL80211_IFTYPE_STATION && + sdata->u.mgd.associated) + ieee80211_vif_cfg_change_notify(sdata, + BSS_CHANGED_ARP_FILTER); + + list_del(&sdata->list); + cfg80211_unregister_wdev(&sdata->wdev); + + if (!netdev) + kfree(sdata); + } +} + +static int netdev_notify(struct notifier_block *nb, + unsigned long state, void *ptr) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + struct ieee80211_sub_if_data *sdata; + + if (state != NETDEV_CHANGENAME) + return NOTIFY_DONE; + + if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) + return NOTIFY_DONE; + + if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) + return NOTIFY_DONE; + + sdata = IEEE80211_DEV_TO_SUB_IF(dev); + memcpy(sdata->name, dev->name, IFNAMSIZ); + ieee80211_debugfs_rename_netdev(sdata); + + return NOTIFY_OK; +} + +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); +} + +void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) +{ + if (sdata->vif.type == NL80211_IFTYPE_AP) + atomic_inc(&sdata->u.ap.num_mcast_sta); + else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) + atomic_inc(&sdata->u.vlan.num_mcast_sta); +} + +void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) +{ + if (sdata->vif.type == NL80211_IFTYPE_AP) + atomic_dec(&sdata->u.ap.num_mcast_sta); + else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) + atomic_dec(&sdata->u.vlan.num_mcast_sta); +} + +void ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data *sdata) +{ + struct ieee80211_local *local = sdata->local; + + if (ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA)) + return; + + ieee80211_stop_vif_queues_norefcount(local, sdata, + IEEE80211_QUEUE_STOP_REASON_CSA); +} + +void ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data *sdata) +{ + struct ieee80211_local *local = sdata->local; + + ieee80211_wake_vif_queues_norefcount(local, sdata, + IEEE80211_QUEUE_STOP_REASON_CSA); +} |