mac80211: Set basic rates while joining ibss network

This patch adds support to nl80211 and mac80211 to set basic rates when
joining/creating ibss network.

Original patch was posted by Johannes Berg on the linux-wireless posting list.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Teemu Paasikivi <ext-teemu.3.paasikivi@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 22ab9d8..64374f4 100644 (file)
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -810,6 +810,7 @@ struct cfg80211_disassoc_request {
  * @beacon_interval: beacon interval to use
  * @privacy: this is a protected network, keys will be configured
  *     after joining
+ * @basic_rates: bitmap of basic rates to use when creating the IBSS
  */
 struct cfg80211_ibss_params {
        u8 *ssid;
@@ -818,6 +819,7 @@ struct cfg80211_ibss_params {
        u8 *ie;
        u8 ssid_len, ie_len;
        u16 beacon_interval;
+       u32 basic_rates;
        bool channel_fixed;
        bool privacy;
 };

diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index bfd7286..9f4e64e 100644 (file)
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -172,6 +172,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
        rcu_assign_pointer(ifibss->presp, skb);
 
        sdata->vif.bss_conf.beacon_int = beacon_int;
+       sdata->vif.bss_conf.basic_rates = basic_rates;
        bss_change = BSS_CHANGED_BEACON_INT;
        bss_change |= ieee80211_reset_erp_info(sdata);
        bss_change |= BSS_CHANGED_BSSID;
@@ -529,7 +530,7 @@ static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
                sdata->drop_unencrypted = 0;
 
        __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
-                                 ifibss->channel, 3, /* first two are basic */
+                                 ifibss->channel, ifibss->basic_rates,
                                  capability, 0);
 }
 
@@ -859,6 +860,7 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
                sdata->u.ibss.fixed_bssid = false;
 
        sdata->u.ibss.privacy = params->privacy;
+       sdata->u.ibss.basic_rates = params->basic_rates;
 
        sdata->vif.bss_conf.beacon_int = params->beacon_interval;
 

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 9d753a0..c3c2be3 100644 (file)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -387,6 +387,8 @@ struct ieee80211_if_ibss {
        unsigned long request;
        unsigned long last_scan_completed;
 
+       u32 basic_rates;
+
        bool timer_running;
 
        bool fixed_bssid;

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index c65e67e..41529ac 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -3955,6 +3955,55 @@ static int nl80211_join_ibss(struct sk_buff *skb, struct genl_info *info)
                }
        }
 
+       if (info->attrs[NL80211_ATTR_BSS_BASIC_RATES]) {
+               u8 *rates =
+                       nla_data(info->attrs[NL80211_ATTR_BSS_BASIC_RATES]);
+               int n_rates =
+                       nla_len(info->attrs[NL80211_ATTR_BSS_BASIC_RATES]);
+               struct ieee80211_supported_band *sband =
+                       wiphy->bands[ibss.channel->band];
+               int i, j;
+
+               if (n_rates == 0) {
+                       err = -EINVAL;
+                       goto out;
+               }
+
+               for (i = 0; i < n_rates; i++) {
+                       int rate = (rates[i] & 0x7f) * 5;
+                       bool found = false;
+
+                       for (j = 0; j < sband->n_bitrates; j++) {
+                               if (sband->bitrates[j].bitrate == rate) {
+                                       found = true;
+                                       ibss.basic_rates |= BIT(j);
+                                       break;
+                               }
+                       }
+                       if (!found) {
+                               err = -EINVAL;
+                               goto out;
+                       }
+               }
+       } else {
+               /*
+               * If no rates were explicitly configured,
+               * use the mandatory rate set for 11b or
+               * 11a for maximum compatibility.
+               */
+               struct ieee80211_supported_band *sband =
+                       wiphy->bands[ibss.channel->band];
+               int j;
+               u32 flag = ibss.channel->band == IEEE80211_BAND_5GHZ ?
+                       IEEE80211_RATE_MANDATORY_A :
+                       IEEE80211_RATE_MANDATORY_B;
+
+               for (j = 0; j < sband->n_bitrates; j++) {
+                       if (sband->bitrates[j].flags & flag)
+                               ibss.basic_rates |= BIT(j);
+               }
+       }
+
        err = cfg80211_join_ibss(rdev, dev, &ibss, connkeys);
 
 out: