From 3d54d25515838543e56889aa7e48f40d00719368 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 21 Aug 2009 14:51:05 +0200 Subject: [PATCH] cfg80211: clean up properly on interface type change When the interface type changes while connected, and the driver does not require the interface to be down for a type change, it is currently possible to get very strange results unless the driver takes special care, which it shouldn't have to. To fix this, take care to disconnect/leave IBSS when changing the interface type -- even if the driver may fail the call. Also process all events that may be pending to avoid running into a situation where an event is reported but only processed after the type has already changed, which would lead to missing events and warnings. A side effect of this is that you will have disconnected or left the IBSS even if the mode change ultimately fails, but since the intention was to change it and thus leave or disconnect, this is not a problem. Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- net/wireless/core.c | 54 +------------------ net/wireless/core.h | 4 ++ net/wireless/nl80211.c | 16 +----- net/wireless/util.c | 108 +++++++++++++++++++++++++++++++++++++ net/wireless/wext-compat.c | 16 ++---- 5 files changed, 117 insertions(+), 81 deletions(-) diff --git a/net/wireless/core.c b/net/wireless/core.c index 9b157caa74fd..45b2be3274db 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -294,69 +294,17 @@ static void cfg80211_rfkill_sync_work(struct work_struct *work) cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); } -static void cfg80211_process_events(struct wireless_dev *wdev) -{ - struct cfg80211_event *ev; - unsigned long flags; - - spin_lock_irqsave(&wdev->event_lock, flags); - while (!list_empty(&wdev->event_list)) { - ev = list_first_entry(&wdev->event_list, - struct cfg80211_event, list); - list_del(&ev->list); - spin_unlock_irqrestore(&wdev->event_lock, flags); - - wdev_lock(wdev); - switch (ev->type) { - case EVENT_CONNECT_RESULT: - __cfg80211_connect_result( - wdev->netdev, is_zero_ether_addr(ev->cr.bssid) ? - NULL : ev->cr.bssid, - ev->cr.req_ie, ev->cr.req_ie_len, - ev->cr.resp_ie, ev->cr.resp_ie_len, - ev->cr.status, - ev->cr.status == WLAN_STATUS_SUCCESS, - NULL); - break; - case EVENT_ROAMED: - __cfg80211_roamed(wdev, ev->rm.bssid, - ev->rm.req_ie, ev->rm.req_ie_len, - ev->rm.resp_ie, ev->rm.resp_ie_len); - break; - case EVENT_DISCONNECTED: - __cfg80211_disconnected(wdev->netdev, - ev->dc.ie, ev->dc.ie_len, - ev->dc.reason, true); - break; - case EVENT_IBSS_JOINED: - __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid); - break; - } - wdev_unlock(wdev); - - kfree(ev); - - spin_lock_irqsave(&wdev->event_lock, flags); - } - spin_unlock_irqrestore(&wdev->event_lock, flags); -} - static void cfg80211_event_work(struct work_struct *work) { struct cfg80211_registered_device *rdev; - struct wireless_dev *wdev; rdev = container_of(work, struct cfg80211_registered_device, event_work); rtnl_lock(); cfg80211_lock_rdev(rdev); - mutex_lock(&rdev->devlist_mtx); - list_for_each_entry(wdev, &rdev->netdev_list, list) - cfg80211_process_events(wdev); - - mutex_unlock(&rdev->devlist_mtx); + cfg80211_process_rdev_events(rdev); cfg80211_unlock_rdev(rdev); rtnl_unlock(); } diff --git a/net/wireless/core.h b/net/wireless/core.h index d262d42cbd5e..2a33d8bc886b 100644 --- a/net/wireless/core.h +++ b/net/wireless/core.h @@ -372,6 +372,10 @@ void cfg80211_sme_disassoc(struct net_device *dev, int idx); void __cfg80211_scan_done(struct work_struct *wk); void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak); void cfg80211_upload_connect_keys(struct wireless_dev *wdev); +int cfg80211_change_iface(struct cfg80211_registered_device *rdev, + struct net_device *dev, enum nl80211_iftype ntype, + u32 *flags, struct vif_params *params); +void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev); struct ieee80211_channel * rdev_fixed_channel(struct cfg80211_registered_device *rdev, diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index a8aaadeb6773..71bfc044a939 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -977,12 +977,6 @@ static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info) } } - if (!rdev->ops->change_virtual_intf || - !(rdev->wiphy.interface_modes & (1 << ntype))) { - err = -EOPNOTSUPP; - goto unlock; - } - if (info->attrs[NL80211_ATTR_MESH_ID]) { if (ntype != NL80211_IFTYPE_MESH_POINT) { err = -EINVAL; @@ -1008,18 +1002,10 @@ static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info) } if (change) - err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev, - ntype, flags, ¶ms); + err = cfg80211_change_iface(rdev, dev, ntype, flags, ¶ms); else err = 0; - WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype); - - if (!err && (ntype != otype)) { - if (otype == NL80211_IFTYPE_ADHOC) - cfg80211_clear_ibss(dev, false); - } - unlock: dev_put(dev); cfg80211_unlock_rdev(rdev); diff --git a/net/wireless/util.c b/net/wireless/util.c index 693275a16a26..3fc2df86278f 100644 --- a/net/wireless/util.c +++ b/net/wireless/util.c @@ -574,3 +574,111 @@ void cfg80211_upload_connect_keys(struct wireless_dev *wdev) kfree(wdev->connect_keys); wdev->connect_keys = NULL; } + +static void cfg80211_process_wdev_events(struct wireless_dev *wdev) +{ + struct cfg80211_event *ev; + unsigned long flags; + const u8 *bssid = NULL; + + spin_lock_irqsave(&wdev->event_lock, flags); + while (!list_empty(&wdev->event_list)) { + ev = list_first_entry(&wdev->event_list, + struct cfg80211_event, list); + list_del(&ev->list); + spin_unlock_irqrestore(&wdev->event_lock, flags); + + wdev_lock(wdev); + switch (ev->type) { + case EVENT_CONNECT_RESULT: + if (!is_zero_ether_addr(ev->cr.bssid)) + bssid = ev->cr.bssid; + __cfg80211_connect_result( + wdev->netdev, bssid, + ev->cr.req_ie, ev->cr.req_ie_len, + ev->cr.resp_ie, ev->cr.resp_ie_len, + ev->cr.status, + ev->cr.status == WLAN_STATUS_SUCCESS, + NULL); + break; + case EVENT_ROAMED: + __cfg80211_roamed(wdev, ev->rm.bssid, + ev->rm.req_ie, ev->rm.req_ie_len, + ev->rm.resp_ie, ev->rm.resp_ie_len); + break; + case EVENT_DISCONNECTED: + __cfg80211_disconnected(wdev->netdev, + ev->dc.ie, ev->dc.ie_len, + ev->dc.reason, true); + break; + case EVENT_IBSS_JOINED: + __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid); + break; + } + wdev_unlock(wdev); + + kfree(ev); + + spin_lock_irqsave(&wdev->event_lock, flags); + } + spin_unlock_irqrestore(&wdev->event_lock, flags); +} + +void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev) +{ + struct wireless_dev *wdev; + + ASSERT_RTNL(); + ASSERT_RDEV_LOCK(rdev); + + mutex_lock(&rdev->devlist_mtx); + + list_for_each_entry(wdev, &rdev->netdev_list, list) + cfg80211_process_wdev_events(wdev); + + mutex_unlock(&rdev->devlist_mtx); +} + +int cfg80211_change_iface(struct cfg80211_registered_device *rdev, + struct net_device *dev, enum nl80211_iftype ntype, + u32 *flags, struct vif_params *params) +{ + int err; + enum nl80211_iftype otype = dev->ieee80211_ptr->iftype; + + ASSERT_RDEV_LOCK(rdev); + + /* don't support changing VLANs, you just re-create them */ + if (otype == NL80211_IFTYPE_AP_VLAN) + return -EOPNOTSUPP; + + if (!rdev->ops->change_virtual_intf || + !(rdev->wiphy.interface_modes & (1 << ntype))) + return -EOPNOTSUPP; + + if (ntype != otype) { + switch (otype) { + case NL80211_IFTYPE_ADHOC: + cfg80211_leave_ibss(rdev, dev, false); + break; + case NL80211_IFTYPE_STATION: + cfg80211_disconnect(rdev, dev, + WLAN_REASON_DEAUTH_LEAVING, true); + break; + case NL80211_IFTYPE_MESH_POINT: + /* mesh should be handled? */ + break; + default: + break; + } + + cfg80211_process_rdev_events(rdev); + } + + err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev, + ntype, flags, params); + + WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype); + + return err; +} diff --git a/net/wireless/wext-compat.c b/net/wireless/wext-compat.c index c12029b1def0..429dd06a4ecc 100644 --- a/net/wireless/wext-compat.c +++ b/net/wireless/wext-compat.c @@ -70,18 +70,8 @@ int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info, enum nl80211_iftype type; int ret; - if (!wdev) - return -EOPNOTSUPP; - rdev = wiphy_to_dev(wdev->wiphy); - if (!rdev->ops->change_virtual_intf) - return -EOPNOTSUPP; - - /* don't support changing VLANs, you just re-create them */ - if (wdev->iftype == NL80211_IFTYPE_AP_VLAN) - return -EOPNOTSUPP; - switch (*mode) { case IW_MODE_INFRA: type = NL80211_IFTYPE_STATION; @@ -104,9 +94,9 @@ int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info, memset(&vifparams, 0, sizeof(vifparams)); - ret = rdev->ops->change_virtual_intf(wdev->wiphy, dev, type, - NULL, &vifparams); - WARN_ON(!ret && wdev->iftype != type); + cfg80211_lock_rdev(rdev); + ret = cfg80211_change_iface(rdev, dev, type, NULL, &vifparams); + cfg80211_unlock_rdev(rdev); return ret; } -- 2.34.1