From dd5b4cc71cd09c33e1579cc6d5720656e94e52de Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Mon, 22 Nov 2010 20:58:24 +0100 Subject: cfg80211/mac80211: improve ad-hoc multicast rate handling - store the multicast rate as an index instead of the rate value (reduces cpu overhead in a hotpath) - validate the rate values (must match a bitrate in at least one sband) Signed-off-by: Felix Fietkau Signed-off-by: John W. Linville --- net/wireless/nl80211.c | 36 +++++++++++++++++++++++++++++++++--- 1 file changed, 33 insertions(+), 3 deletions(-) (limited to 'net/wireless') diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index b15eb77195d8..8734efa663d1 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -3600,6 +3600,34 @@ static int nl80211_disassociate(struct sk_buff *skb, struct genl_info *info) local_state_change); } +static bool +nl80211_parse_mcast_rate(struct cfg80211_registered_device *rdev, + int mcast_rate[IEEE80211_NUM_BANDS], + int rateval) +{ + struct wiphy *wiphy = &rdev->wiphy; + bool found = false; + int band, i; + + for (band = 0; band < IEEE80211_NUM_BANDS; band++) { + struct ieee80211_supported_band *sband; + + sband = wiphy->bands[band]; + if (!sband) + continue; + + for (i = 0; i < sband->n_bitrates; i++) { + if (sband->bitrates[i].bitrate == rateval) { + mcast_rate[band] = i + 1; + found = true; + break; + } + } + } + + return found; +} + static int nl80211_join_ibss(struct sk_buff *skb, struct genl_info *info) { struct cfg80211_registered_device *rdev = info->user_ptr[0]; @@ -3683,9 +3711,11 @@ static int nl80211_join_ibss(struct sk_buff *skb, struct genl_info *info) return -EINVAL; } } - if (info->attrs[NL80211_ATTR_MCAST_RATE]) - ibss.mcast_rate = - nla_get_u32(info->attrs[NL80211_ATTR_MCAST_RATE]); + + if (info->attrs[NL80211_ATTR_MCAST_RATE] && + !nl80211_parse_mcast_rate(rdev, ibss.mcast_rate, + nla_get_u32(info->attrs[NL80211_ATTR_MCAST_RATE]))) + return -EINVAL; if (ibss.privacy && info->attrs[NL80211_ATTR_KEYS]) { connkeys = nl80211_parse_connkeys(rdev, -- cgit v1.2.3