From 8dcb20038ade81f9a87c024e7f12ec74f0e95f33 Mon Sep 17 00:00:00 2001 From: Jouni Malinen Date: Sat, 28 Aug 2010 19:36:10 +0300 Subject: [PATCH] mac80211: Filter ProbeReq SuppRates based on TX rate mask If the TX rate set has been masked, the removed rates can also be removed from the Supported Rates and Extended Supported Rates IEs in Probe Request frames. Signed-off-by: Jouni Malinen Signed-off-by: John W. Linville --- net/mac80211/ieee80211_i.h | 2 +- net/mac80211/scan.c | 2 +- net/mac80211/util.c | 37 ++++++++++++++++++++++--------------- 3 files changed, 24 insertions(+), 17 deletions(-) diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index 9346a6b..3641563 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -1256,7 +1256,7 @@ void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata, const u8 *key, u8 key_len, u8 key_idx); int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer, const u8 *ie, size_t ie_len, - enum ieee80211_band band); + enum ieee80211_band band, u32 rate_mask); void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst, const u8 *ssid, size_t ssid_len, const u8 *ie, size_t ie_len); diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c index d60389b..1623e9d 100644 --- a/net/mac80211/scan.c +++ b/net/mac80211/scan.c @@ -242,7 +242,7 @@ static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) local->hw_scan_req->n_channels = n_chans; ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, - req->ie, req->ie_len, band); + req->ie, req->ie_len, band, (u32) -1); local->hw_scan_req->ie_len = ielen; return true; diff --git a/net/mac80211/util.c b/net/mac80211/util.c index 737f426..bfd19d7 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -895,26 +895,33 @@ void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata, int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer, const u8 *ie, size_t ie_len, - enum ieee80211_band band) + enum ieee80211_band band, u32 rate_mask) { struct ieee80211_supported_band *sband; u8 *pos; size_t offset = 0, noffset; int supp_rates_len, i; + u8 rates[32]; + int num_rates; + int ext_rates_len; sband = local->hw.wiphy->bands[band]; pos = buffer; - supp_rates_len = min_t(int, sband->n_bitrates, 8); + num_rates = 0; + for (i = 0; i < sband->n_bitrates; i++) { + if ((BIT(i) & rate_mask) == 0) + continue; /* skip rate */ + rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5); + } + + supp_rates_len = min_t(int, num_rates, 8); *pos++ = WLAN_EID_SUPP_RATES; *pos++ = supp_rates_len; - - for (i = 0; i < supp_rates_len; i++) { - int rate = sband->bitrates[i].bitrate; - *pos++ = (u8) (rate / 5); - } + memcpy(pos, rates, supp_rates_len); + pos += supp_rates_len; /* insert "request information" if in custom IEs */ if (ie && ie_len) { @@ -932,14 +939,12 @@ int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer, offset = noffset; } - if (sband->n_bitrates > i) { + ext_rates_len = num_rates - supp_rates_len; + if (ext_rates_len > 0) { *pos++ = WLAN_EID_EXT_SUPP_RATES; - *pos++ = sband->n_bitrates - i; - - for (; i < sband->n_bitrates; i++) { - int rate = sband->bitrates[i].bitrate; - *pos++ = (u8) (rate / 5); - } + *pos++ = ext_rates_len; + memcpy(pos, rates + supp_rates_len, ext_rates_len); + pos += ext_rates_len; } /* insert custom IEs that go before HT */ @@ -1018,7 +1023,9 @@ void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst, } buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len, - local->hw.conf.channel->band); + local->hw.conf.channel->band, + sdata->rc_rateidx_mask + [local->hw.conf.channel->band]); skb = ieee80211_probereq_get(&local->hw, &sdata->vif, ssid, ssid_len, -- 2.7.4