5 files changed, 139 insertions, 0 deletions

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 2be7c63bc0f2..447c02a5190e 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -89,6 +89,8 @@
  * @NL80211_CMD_DEL_PATH: Remove a mesh path identified by %NL80211_ATTR_MAC
  *      or, if no MAC address given, all mesh paths, on the interface identified
  *      by %NL80211_ATTR_IFINDEX.
+ * @NL80211_CMD_SET_BSS: Set BSS attributes for BSS identified by
+ *      %NL80211_ATTR_IFINDEX.
  *
  * @NL80211_CMD_MAX: highest used command number
  * @__NL80211_CMD_AFTER_LAST: internal use
@@ -127,6 +129,8 @@ enum nl80211_commands {
         NL80211_CMD_NEW_MPATH,
         NL80211_CMD_DEL_MPATH,
 
+        NL80211_CMD_SET_BSS,
+
         /* add commands here */
 
         /* used to define NL80211_CMD_MAX below */
@@ -134,6 +138,11 @@ enum nl80211_commands {
         NL80211_CMD_MAX = __NL80211_CMD_AFTER_LAST - 1
 };
 
+/*
+ * Allow user space programs to use #ifdef on new commands by defining them
+ * here
+ */
+#define NL80211_CMD_SET_BSS NL80211_CMD_SET_BSS
 
 /**
  * enum nl80211_attrs - nl80211 netlink attributes
@@ -192,6 +201,12 @@ enum nl80211_commands {
  * @NL80211_ATTR_MNTR_FLAGS: flags, nested element with NLA_FLAG attributes of
  *      &enum nl80211_mntr_flags.
  *
+ * @NL80211_ATTR_BSS_CTS_PROT: whether CTS protection is enabled (u8, 0 or 1)
+ * @NL80211_ATTR_BSS_SHORT_PREAMBLE: whether short preamble is enabled
+ *      (u8, 0 or 1)
+ * @NL80211_ATTR_BSS_SHORT_SLOT_TIME: whether short slot time enabled
+ *      (u8, 0 or 1)
+ *
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -235,6 +250,10 @@ enum nl80211_attrs {
         NL80211_ATTR_MPATH_NEXT_HOP,
         NL80211_ATTR_MPATH_INFO,
 
+        NL80211_ATTR_BSS_CTS_PROT,
+        NL80211_ATTR_BSS_SHORT_PREAMBLE,
+        NL80211_ATTR_BSS_SHORT_SLOT_TIME,
+
         /* add attributes here, update the policy in nl80211.c */
 
         __NL80211_ATTR_AFTER_LAST,
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index e00750836ba5..7afef14d5c5b 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -268,6 +268,23 @@ struct mpath_info {
         u8 flags;
 };
 
+/**
+ * struct bss_parameters - BSS parameters
+ *
+ * Used to change BSS parameters (mainly for AP mode).
+ *
+ * @use_cts_prot: Whether to use CTS protection
+ *      (0 = no, 1 = yes, -1 = do not change)
+ * @use_short_preamble: Whether the use of short preambles is allowed
+ *      (0 = no, 1 = yes, -1 = do not change)
+ * @use_short_slot_time: Whether the use of short slot time is allowed
+ *      (0 = no, 1 = yes, -1 = do not change)
+ */
+struct bss_parameters {
+        int use_cts_prot;
+        int use_short_preamble;
+        int use_short_slot_time;
+};
 
 /* from net/wireless.h */
 struct wiphy;
@@ -318,6 +335,8 @@ struct wiphy;
  * @change_station: Modify a given station.
  *
  * @set_mesh_cfg: set mesh parameters (by now, just mesh id)
+ *
+ * @change_bss: Modify parameters for a given BSS.
  */
 struct cfg80211_ops {
         int     (*add_virtual_intf)(struct wiphy *wiphy, char *name,
@@ -370,6 +389,9 @@ struct cfg80211_ops {
         int     (*dump_mpath)(struct wiphy *wiphy, struct net_device *dev,
                                int idx, u8 *dst, u8 *next_hop,
                                struct mpath_info *pinfo);
+
+        int     (*change_bss)(struct wiphy *wiphy, struct net_device *dev,
+                              struct bss_parameters *params);
 };
 
 #endif /* __NET_CFG80211_H */
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 0fdc3dabc964..7c399a9c11da 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -158,12 +158,14 @@ struct ieee80211_low_level_stats {
  *      also implies a change in the AID.
  * @BSS_CHANGED_ERP_CTS_PROT: CTS protection changed
  * @BSS_CHANGED_ERP_PREAMBLE: preamble changed
+ * @BSS_CHANGED_ERP_SLOT: slot timing changed
  * @BSS_CHANGED_HT: 802.11n parameters changed
  */
 enum ieee80211_bss_change {
         BSS_CHANGED_ASSOC               = 1<<0,
         BSS_CHANGED_ERP_CTS_PROT        = 1<<1,
         BSS_CHANGED_ERP_PREAMBLE        = 1<<2,
+        BSS_CHANGED_ERP_SLOT            = 1<<3,
         BSS_CHANGED_HT                  = 1<<4,
 };
 
@@ -177,6 +179,7 @@ enum ieee80211_bss_change {
  * @aid: association ID number, valid only when @assoc is true
  * @use_cts_prot: use CTS protection
  * @use_short_preamble: use 802.11b short preamble
+ * @use_short_slot: use short slot time (only relevant for ERP)
  * @dtim_period: num of beacons before the next DTIM, for PSM
  * @timestamp: beacon timestamp
  * @beacon_int: beacon interval
@@ -192,6 +195,7 @@ struct ieee80211_bss_conf {
         /* erp related data */
         bool use_cts_prot;
         bool use_short_preamble;
+        bool use_short_slot;
         u8 dtim_period;
         u16 beacon_int;
         u16 assoc_capability;
@@ -420,6 +424,11 @@ struct ieee80211_rx_status {
  * @IEEE80211_CONF_PS: Enable 802.11 power save mode
  */
 enum ieee80211_conf_flags {
+        /*
+         * TODO: IEEE80211_CONF_SHORT_SLOT_TIME will be removed once drivers
+         * have been converted to use bss_info_changed() for slot time
+         * configuration
+         */
         IEEE80211_CONF_SHORT_SLOT_TIME  = (1<<0),
         IEEE80211_CONF_RADIOTAP         = (1<<1),
         IEEE80211_CONF_SUPPORT_HT_MODE  = (1<<2),
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 6d2ad2bf3ab5..2b19532f4c8a 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1010,6 +1010,42 @@ static int ieee80211_dump_mpath(struct wiphy *wiphy, struct net_device *dev,
 }
 #endif
 
+static int ieee80211_change_bss(struct wiphy *wiphy,
+                                struct net_device *dev,
+                                struct bss_parameters *params)
+{
+        struct ieee80211_local *local = wiphy_priv(wiphy);
+        struct ieee80211_sub_if_data *sdata;
+        u32 changed = 0;
+
+        if (dev == local->mdev)
+                return -EOPNOTSUPP;
+
+        sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+        if (sdata->vif.type != IEEE80211_IF_TYPE_AP)
+                return -EINVAL;
+
+        if (params->use_cts_prot >= 0) {
+                sdata->bss_conf.use_cts_prot = params->use_cts_prot;
+                changed |= BSS_CHANGED_ERP_CTS_PROT;
+        }
+        if (params->use_short_preamble >= 0) {
+                sdata->bss_conf.use_short_preamble =
+                        params->use_short_preamble;
+                changed |= BSS_CHANGED_ERP_PREAMBLE;
+        }
+        if (params->use_short_slot_time >= 0) {
+                sdata->bss_conf.use_short_slot =
+                        params->use_short_slot_time;
+                changed |= BSS_CHANGED_ERP_SLOT;
+        }
+
+        ieee80211_bss_info_change_notify(sdata, changed);
+
+        return 0;
+}
+
 struct cfg80211_ops mac80211_config_ops = {
         .add_virtual_intf = ieee80211_add_iface,
         .del_virtual_intf = ieee80211_del_iface,
@@ -1033,4 +1069,5 @@ struct cfg80211_ops mac80211_config_ops = {
         .get_mpath = ieee80211_get_mpath,
         .dump_mpath = ieee80211_dump_mpath,
 #endif
+        .change_bss = ieee80211_change_bss,
 };
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 59eb2cf42e5f..47542ee01c57 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -87,6 +87,10 @@ static struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] __read_mostly = {
         [NL80211_ATTR_MESH_ID] = { .type = NLA_BINARY,
                                 .len = IEEE80211_MAX_MESH_ID_LEN },
         [NL80211_ATTR_MPATH_NEXT_HOP] = { .type = NLA_U32 },
+
+        [NL80211_ATTR_BSS_CTS_PROT] = { .type = NLA_U8 },
+        [NL80211_ATTR_BSS_SHORT_PREAMBLE] = { .type = NLA_U8 },
+        [NL80211_ATTR_BSS_SHORT_SLOT_TIME] = { .type = NLA_U8 },
 };
 
 /* message building helper */
@@ -1525,6 +1529,48 @@ static int nl80211_del_mpath(struct sk_buff *skb, struct genl_info *info)
         return err;
 }
 
+static int nl80211_set_bss(struct sk_buff *skb, struct genl_info *info)
+{
+        struct cfg80211_registered_device *drv;
+        int err;
+        struct net_device *dev;
+        struct bss_parameters params;
+
+        memset(&params, 0, sizeof(params));
+        /* default to not changing parameters */
+        params.use_cts_prot = -1;
+        params.use_short_preamble = -1;
+        params.use_short_slot_time = -1;
+
+        if (info->attrs[NL80211_ATTR_BSS_CTS_PROT])
+                params.use_cts_prot =
+                    nla_get_u8(info->attrs[NL80211_ATTR_BSS_CTS_PROT]);
+        if (info->attrs[NL80211_ATTR_BSS_SHORT_PREAMBLE])
+                params.use_short_preamble =
+                    nla_get_u8(info->attrs[NL80211_ATTR_BSS_SHORT_PREAMBLE]);
+        if (info->attrs[NL80211_ATTR_BSS_SHORT_SLOT_TIME])
+                params.use_short_slot_time =
+                    nla_get_u8(info->attrs[NL80211_ATTR_BSS_SHORT_SLOT_TIME]);
+
+        err = get_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
+        if (err)
+                return err;
+
+        if (!drv->ops->change_bss) {
+                err = -EOPNOTSUPP;
+                goto out;
+        }
+
+        rtnl_lock();
+        err = drv->ops->change_bss(&drv->wiphy, dev, &params);
+        rtnl_unlock();
+
+ out:
+        cfg80211_put_dev(drv);
+        dev_put(dev);
+        return err;
+}
+
 static struct genl_ops nl80211_ops[] = {
         {
                 .cmd = NL80211_CMD_GET_WIPHY,
@@ -1656,6 +1702,12 @@ static struct genl_ops nl80211_ops[] = {
                 .policy = nl80211_policy,
                 .flags = GENL_ADMIN_PERM,
         },
+        {
+                .cmd = NL80211_CMD_SET_BSS,
+                .doit = nl80211_set_bss,
+                .policy = nl80211_policy,
+                .flags = GENL_ADMIN_PERM,
+        },
 };
 
 /* multicast groups */