From 7f2b8562c2ee6e2a69c2715b9927f708f2f861dc Mon Sep 17 00:00:00 2001 From: Ying Xue Date: Wed, 15 Jan 2014 10:23:45 +0800 Subject: [PATCH] net: nl80211: __dev_get_by_index instead of dev_get_by_index to find interface As __cfg80211_rdev_from_attrs(), nl80211_dump_wiphy_parse() and nl80211_set_wiphy() are all under rtnl_lock protection, __dev_get_by_index() instead of dev_get_by_index() should be used to find interface handler in them allowing us to avoid to change interface reference counter. Cc: Johannes Berg Signed-off-by: Ying Xue Signed-off-by: David S. Miller --- net/wireless/nl80211.c | 102 +++++++++++++++-------------------------- 1 file changed, 37 insertions(+), 65 deletions(-) diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index b4f40fe84a01..4fa555e4dedc 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -165,7 +165,7 @@ __cfg80211_rdev_from_attrs(struct net *netns, struct nlattr **attrs) if (attrs[NL80211_ATTR_IFINDEX]) { int ifindex = nla_get_u32(attrs[NL80211_ATTR_IFINDEX]); - netdev = dev_get_by_index(netns, ifindex); + netdev = __dev_get_by_index(netns, ifindex); if (netdev) { if (netdev->ieee80211_ptr) tmp = wiphy_to_dev( @@ -173,8 +173,6 @@ __cfg80211_rdev_from_attrs(struct net *netns, struct nlattr **attrs) else tmp = NULL; - dev_put(netdev); - /* not wireless device -- return error */ if (!tmp) return ERR_PTR(-EINVAL); @@ -1656,7 +1654,7 @@ static int nl80211_dump_wiphy_parse(struct sk_buff *skb, struct cfg80211_registered_device *rdev; int ifidx = nla_get_u32(tb[NL80211_ATTR_IFINDEX]); - netdev = dev_get_by_index(sock_net(skb->sk), ifidx); + netdev = __dev_get_by_index(sock_net(skb->sk), ifidx); if (!netdev) return -ENODEV; if (netdev->ieee80211_ptr) { @@ -1664,7 +1662,6 @@ static int nl80211_dump_wiphy_parse(struct sk_buff *skb, netdev->ieee80211_ptr->wiphy); state->filter_wiphy = rdev->wiphy_idx; } - dev_put(netdev); } return 0; @@ -1987,7 +1984,7 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) if (info->attrs[NL80211_ATTR_IFINDEX]) { int ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]); - netdev = dev_get_by_index(genl_info_net(info), ifindex); + netdev = __dev_get_by_index(genl_info_net(info), ifindex); if (netdev && netdev->ieee80211_ptr) rdev = wiphy_to_dev(netdev->ieee80211_ptr->wiphy); else @@ -2015,32 +2012,24 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) rdev, nla_data(info->attrs[NL80211_ATTR_WIPHY_NAME])); if (result) - goto bad_res; + return result; if (info->attrs[NL80211_ATTR_WIPHY_TXQ_PARAMS]) { struct ieee80211_txq_params txq_params; struct nlattr *tb[NL80211_TXQ_ATTR_MAX + 1]; - if (!rdev->ops->set_txq_params) { - result = -EOPNOTSUPP; - goto bad_res; - } + if (!rdev->ops->set_txq_params) + return -EOPNOTSUPP; - if (!netdev) { - result = -EINVAL; - goto bad_res; - } + if (!netdev) + return -EINVAL; if (netdev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP && - netdev->ieee80211_ptr->iftype != NL80211_IFTYPE_P2P_GO) { - result = -EINVAL; - goto bad_res; - } + netdev->ieee80211_ptr->iftype != NL80211_IFTYPE_P2P_GO) + return -EINVAL; - if (!netif_running(netdev)) { - result = -ENETDOWN; - goto bad_res; - } + if (!netif_running(netdev)) + return -ENETDOWN; nla_for_each_nested(nl_txq_params, info->attrs[NL80211_ATTR_WIPHY_TXQ_PARAMS], @@ -2051,12 +2040,12 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) txq_params_policy); result = parse_txq_params(tb, &txq_params); if (result) - goto bad_res; + return result; result = rdev_set_txq_params(rdev, netdev, &txq_params); if (result) - goto bad_res; + return result; } } @@ -2065,7 +2054,7 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) nl80211_can_set_dev_channel(wdev) ? wdev : NULL, info); if (result) - goto bad_res; + return result; } if (info->attrs[NL80211_ATTR_WIPHY_TX_POWER_SETTING]) { @@ -2076,19 +2065,15 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) if (!(rdev->wiphy.features & NL80211_FEATURE_VIF_TXPOWER)) txp_wdev = NULL; - if (!rdev->ops->set_tx_power) { - result = -EOPNOTSUPP; - goto bad_res; - } + if (!rdev->ops->set_tx_power) + return -EOPNOTSUPP; idx = NL80211_ATTR_WIPHY_TX_POWER_SETTING; type = nla_get_u32(info->attrs[idx]); if (!info->attrs[NL80211_ATTR_WIPHY_TX_POWER_LEVEL] && - (type != NL80211_TX_POWER_AUTOMATIC)) { - result = -EINVAL; - goto bad_res; - } + (type != NL80211_TX_POWER_AUTOMATIC)) + return -EINVAL; if (type != NL80211_TX_POWER_AUTOMATIC) { idx = NL80211_ATTR_WIPHY_TX_POWER_LEVEL; @@ -2097,7 +2082,7 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) result = rdev_set_tx_power(rdev, txp_wdev, type, mbm); if (result) - goto bad_res; + return result; } if (info->attrs[NL80211_ATTR_WIPHY_ANTENNA_TX] && @@ -2105,10 +2090,8 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) u32 tx_ant, rx_ant; if ((!rdev->wiphy.available_antennas_tx && !rdev->wiphy.available_antennas_rx) || - !rdev->ops->set_antenna) { - result = -EOPNOTSUPP; - goto bad_res; - } + !rdev->ops->set_antenna) + return -EOPNOTSUPP; tx_ant = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_ANTENNA_TX]); rx_ant = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_ANTENNA_RX]); @@ -2116,17 +2099,15 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) /* reject antenna configurations which don't match the * available antenna masks, except for the "all" mask */ if ((~tx_ant && (tx_ant & ~rdev->wiphy.available_antennas_tx)) || - (~rx_ant && (rx_ant & ~rdev->wiphy.available_antennas_rx))) { - result = -EINVAL; - goto bad_res; - } + (~rx_ant && (rx_ant & ~rdev->wiphy.available_antennas_rx))) + return -EINVAL; tx_ant = tx_ant & rdev->wiphy.available_antennas_tx; rx_ant = rx_ant & rdev->wiphy.available_antennas_rx; result = rdev_set_antenna(rdev, tx_ant, rx_ant); if (result) - goto bad_res; + return result; } changed = 0; @@ -2134,30 +2115,27 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) if (info->attrs[NL80211_ATTR_WIPHY_RETRY_SHORT]) { retry_short = nla_get_u8( info->attrs[NL80211_ATTR_WIPHY_RETRY_SHORT]); - if (retry_short == 0) { - result = -EINVAL; - goto bad_res; - } + if (retry_short == 0) + return -EINVAL; + changed |= WIPHY_PARAM_RETRY_SHORT; } if (info->attrs[NL80211_ATTR_WIPHY_RETRY_LONG]) { retry_long = nla_get_u8( info->attrs[NL80211_ATTR_WIPHY_RETRY_LONG]); - if (retry_long == 0) { - result = -EINVAL; - goto bad_res; - } + if (retry_long == 0) + return -EINVAL; + changed |= WIPHY_PARAM_RETRY_LONG; } if (info->attrs[NL80211_ATTR_WIPHY_FRAG_THRESHOLD]) { frag_threshold = nla_get_u32( info->attrs[NL80211_ATTR_WIPHY_FRAG_THRESHOLD]); - if (frag_threshold < 256) { - result = -EINVAL; - goto bad_res; - } + if (frag_threshold < 256) + return -EINVAL; + if (frag_threshold != (u32) -1) { /* * Fragments (apart from the last one) are required to @@ -2187,10 +2165,8 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) u32 old_frag_threshold, old_rts_threshold; u8 old_coverage_class; - if (!rdev->ops->set_wiphy_params) { - result = -EOPNOTSUPP; - goto bad_res; - } + if (!rdev->ops->set_wiphy_params) + return -EOPNOTSUPP; old_retry_short = rdev->wiphy.retry_short; old_retry_long = rdev->wiphy.retry_long; @@ -2218,11 +2194,7 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) rdev->wiphy.coverage_class = old_coverage_class; } } - - bad_res: - if (netdev) - dev_put(netdev); - return result; + return 0; } static inline u64 wdev_id(struct wireless_dev *wdev) -- 2.39.5