diff options
Diffstat (limited to 'net/mac80211/iface.c')
| -rw-r--r-- | net/mac80211/iface.c | 157 |
1 files changed, 124 insertions, 33 deletions
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index cba3d806d722..c1cc200ac81f 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -148,7 +148,12 @@ static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, return 0; } -static int ieee80211_open(struct net_device *dev) +/* + * 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. + */ +static int ieee80211_do_open(struct net_device *dev, bool coming_up) { struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); struct ieee80211_local *local = sdata->local; @@ -157,15 +162,6 @@ static int ieee80211_open(struct net_device *dev) int res; u32 hw_reconf_flags = 0; - /* fail early if user set an invalid address */ - if (!is_zero_ether_addr(dev->dev_addr) && - !is_valid_ether_addr(dev->dev_addr)) - return -EADDRNOTAVAIL; - - res = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); - if (res) - return res; - switch (sdata->vif.type) { case NL80211_IFTYPE_WDS: if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) @@ -258,9 +254,11 @@ static int ieee80211_open(struct net_device *dev) netif_carrier_on(dev); break; default: - res = drv_add_interface(local, &sdata->vif); - if (res) - goto err_stop; + if (coming_up) { + res = drv_add_interface(local, &sdata->vif); + if (res) + goto err_stop; + } if (ieee80211_vif_is_mesh(&sdata->vif)) { local->fif_other_bss++; @@ -316,7 +314,9 @@ static int ieee80211_open(struct net_device *dev) hw_reconf_flags |= __ieee80211_recalc_idle(local); mutex_unlock(&local->mtx); - local->open_count++; + if (coming_up) + local->open_count++; + if (hw_reconf_flags) { ieee80211_hw_config(local, hw_reconf_flags); /* @@ -331,6 +331,8 @@ static int ieee80211_open(struct net_device *dev) netif_tx_start_all_queues(dev); + set_bit(SDATA_STATE_RUNNING, &sdata->state); + return 0; err_del_interface: drv_remove_interface(local, &sdata->vif); @@ -344,19 +346,38 @@ static int ieee80211_open(struct net_device *dev) return res; } -static int ieee80211_stop(struct net_device *dev) +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_zero_ether_addr(dev->dev_addr) && + !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(dev, 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; + clear_bit(SDATA_STATE_RUNNING, &sdata->state); + /* * Stop TX on this interface first. */ - netif_tx_stop_all_queues(dev); + netif_tx_stop_all_queues(sdata->dev); /* * Purge work for this interface. @@ -394,11 +415,12 @@ static int ieee80211_stop(struct net_device *dev) if (sdata->vif.type == NL80211_IFTYPE_AP) local->fif_pspoll--; - netif_addr_lock_bh(dev); + netif_addr_lock_bh(sdata->dev); spin_lock_bh(&local->filter_lock); - __hw_addr_unsync(&local->mc_list, &dev->mc, dev->addr_len); + __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, + sdata->dev->addr_len); spin_unlock_bh(&local->filter_lock); - netif_addr_unlock_bh(dev); + netif_addr_unlock_bh(sdata->dev); ieee80211_configure_filter(local); @@ -432,7 +454,8 @@ static int ieee80211_stop(struct net_device *dev) WARN_ON(!list_empty(&sdata->u.ap.vlans)); } - local->open_count--; + if (going_down) + local->open_count--; switch (sdata->vif.type) { case NL80211_IFTYPE_AP_VLAN: @@ -504,7 +527,8 @@ static int ieee80211_stop(struct net_device *dev) */ ieee80211_free_keys(sdata); - drv_remove_interface(local, &sdata->vif); + if (going_down) + drv_remove_interface(local, &sdata->vif); } sdata->bss = NULL; @@ -540,6 +564,13 @@ static int ieee80211_stop(struct net_device *dev) } } spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); +} + +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; } @@ -857,9 +888,72 @@ static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 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; + + 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; + default: + return -EBUSY; + } + + ret = ieee80211_check_concurrent_iface(sdata, type); + if (ret) + return ret; + + ieee80211_do_stop(sdata, false); + + ieee80211_teardown_sdata(sdata->dev); + + ret = drv_change_interface(local, sdata, type); + if (ret) + type = sdata->vif.type; + + ieee80211_setup_sdata(sdata, type); + + err = ieee80211_do_open(sdata->dev, 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 == sdata->vif.type) @@ -870,18 +964,15 @@ int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, type == NL80211_IFTYPE_ADHOC) return -EOPNOTSUPP; - /* - * We could, here, on changes between IBSS/STA/MESH modes, - * invoke an MLME function instead that disassociates etc. - * and goes into the requested mode. - */ - - if (ieee80211_sdata_running(sdata)) - return -EBUSY; - - /* Purge and reset type-dependent state. */ - ieee80211_teardown_sdata(sdata->dev); - ieee80211_setup_sdata(sdata, type); + 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->dev); + ieee80211_setup_sdata(sdata, type); + } /* reset some values that shouldn't be kept across type changes */ sdata->vif.bss_conf.basic_rates = |
