Return-path: Received: from mga03.intel.com ([134.134.136.65]:11592 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751018AbaKKO1n (ORCPT ); Tue, 11 Nov 2014 09:27:43 -0500 From: Jukka Rissanen To: linux-wireless@vger.kernel.org Subject: [PATCH] nl80211: Stop scheduled scan if netlink client disappears Date: Tue, 11 Nov 2014 16:27:39 +0200 Message-Id: <1415716059-608-1-git-send-email-jukka.rissanen@linux.intel.com> (sfid-20141111_152746_888050_18874AA2) Sender: linux-wireless-owner@vger.kernel.org List-ID: A new attribute NL80211_ATTR_SCAN_SOCKET_OWNER can be set by the scan initiator. If present, the attribute will cause the scan to be stopped if the client dies. Signed-off-by: Jukka Rissanen --- include/net/cfg80211.h | 2 ++ include/uapi/linux/nl80211.h | 8 ++++++++ net/wireless/nl80211.c | 35 +++++++++++++++++++++++++++++++++++ 3 files changed, 45 insertions(+) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index 220d5f5..84378bf 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -1512,6 +1512,8 @@ struct cfg80211_sched_scan_request { struct wiphy *wiphy; struct net_device *dev; unsigned long scan_start; + u32 owner_nlportid; + struct work_struct sched_scan_stop_wk; /* keep last */ struct ieee80211_channel *channels[0]; diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h index 442369f..2731a04 100644 --- a/include/uapi/linux/nl80211.h +++ b/include/uapi/linux/nl80211.h @@ -1669,6 +1669,11 @@ enum nl80211_commands { * @NL80211_ATTR_SMPS_MODE: SMPS mode to use (ap mode). see * &enum nl80211_smps_mode. * + * @NL80211_ATTR_SCAN_SOCKET_OWNER: flag attribute, if set during scheduled + * scan start then the new scan req will be owned by the netlink socket + * that created it and the pending scan will be stopped when the socket + * is closed. + * * @NL80211_ATTR_MAX: highest attribute number currently defined * @__NL80211_ATTR_AFTER_LAST: internal use */ @@ -2021,6 +2026,8 @@ enum nl80211_attrs { NL80211_ATTR_SMPS_MODE, + NL80211_ATTR_SCAN_SOCKET_OWNER, + /* add attributes here, update the policy in nl80211.c */ __NL80211_ATTR_AFTER_LAST, @@ -2056,6 +2063,7 @@ enum nl80211_attrs { #define NL80211_ATTR_KEY NL80211_ATTR_KEY #define NL80211_ATTR_KEYS NL80211_ATTR_KEYS #define NL80211_ATTR_FEATURE_FLAGS NL80211_ATTR_FEATURE_FLAGS +#define NL80211_ATTR_SCAN_SOCKET_OWNER NL80211_ATTR_SCAN_SOCKET_OWNER #define NL80211_MAX_SUPP_RATES 32 #define NL80211_MAX_SUPP_HT_RATES 77 diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index d0a8361..653f649 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -395,6 +395,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = { [NL80211_ATTR_USER_PRIO] = { .type = NLA_U8 }, [NL80211_ATTR_ADMITTED_TIME] = { .type = NLA_U16 }, [NL80211_ATTR_SMPS_MODE] = { .type = NLA_U8 }, + [NL80211_ATTR_SCAN_SOCKET_OWNER] = { .type = NLA_FLAG }, }; /* policy for the key attributes */ @@ -5681,6 +5682,21 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info) return err; } +static void nl80211_sched_scan_stop_wk(struct work_struct *work) +{ + struct cfg80211_sched_scan_request *req; + struct cfg80211_registered_device *rdev; + + req = container_of(work, struct cfg80211_sched_scan_request, + sched_scan_stop_wk); + + rdev = wiphy_to_rdev(req->wiphy); + + rtnl_lock(); + __cfg80211_stop_sched_scan(rdev, false); + rtnl_unlock(); +} + static int nl80211_start_sched_scan(struct sk_buff *skb, struct genl_info *info) { @@ -5955,6 +5971,13 @@ static int nl80211_start_sched_scan(struct sk_buff *skb, err = rdev_sched_scan_start(rdev, dev, request); if (!err) { + if (info->attrs[NL80211_ATTR_SCAN_SOCKET_OWNER]) { + INIT_WORK(&request->sched_scan_stop_wk, + nl80211_sched_scan_stop_wk); + + request->owner_nlportid = info->snd_portid; + } + rdev->sched_scan_req = request; nl80211_send_sched_scan(rdev, dev, NL80211_CMD_START_SCHED_SCAN); @@ -12127,6 +12150,12 @@ static int nl80211_netlink_notify(struct notifier_block * nb, list_for_each_entry_rcu(rdev, &cfg80211_rdev_list, list) { bool schedule_destroy_work = false; + bool schedule_scan_stop = false; + struct cfg80211_sched_scan_request *req = rdev->sched_scan_req; + + if (req && req->owner_nlportid == notify->portid && + notify->portid) + schedule_scan_stop = true; list_for_each_entry_rcu(wdev, &rdev->wdev_list, list) { cfg80211_mlme_unregister_socket(wdev, notify->portid); @@ -12157,6 +12186,12 @@ static int nl80211_netlink_notify(struct notifier_block * nb, spin_unlock(&rdev->destroy_list_lock); schedule_work(&rdev->destroy_work); } + } else if (schedule_scan_stop) { + req->owner_nlportid = 0; + + if (rdev->ops->sched_scan_stop && + rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_SCHED_SCAN) + schedule_work(&req->sched_scan_stop_wk); } } -- 1.8.3.1