commit 9f1ba9062e032fb7b395cd27fc564754fe4e9867
author Jouni Malinen <jouni.malinen@atheros.com> Thu Aug 07 20:07:01 2008 +0300
committer John W. Linville <linville@tuxdriver.com> Fri Aug 29 16:23:55 2008 -0400
tree 6610106cd769aa3cc144b7a4f1547e07eeba5c88
parent 7f93ea3e246db512c0c17b79847f57dd3a2891e1

mac80211/cfg80211: Add BSS configuration options for AP mode

This change adds a new cfg80211 command, NL80211_CMD_SET_BSS, to allow
AP mode BSS parameters to be changed from user space (e.g., hostapd).
The drivers using mac80211 are expected to be modified with separate
changes to use the new BSS info parameter for short slot time in the
bss_info_changed() handler.

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/cfg.c

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 6d2ad2b..2b19532 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1010,6 +1010,42 @@
 }
 #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 @@
 	.get_mpath = ieee80211_get_mpath,
 	.dump_mpath = ieee80211_dump_mpath,
 #endif
+	.change_bss = ieee80211_change_bss,
 };

net/wireless/nl80211.c

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 59eb2cf..47542ee 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -87,6 +87,10 @@
 	[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 @@
 	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 @@
 		.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 */