cfg80211: connect/disconnect API

This patch introduces the cfg80211 connect/disconnect API.
The goal here is to run the AUTH and ASSOC steps in one call.
This is needed for some fullmac cards that run both steps
directly from the target, after the host driver sends a
connect command.

Additionally, all the new crypto parameters for connect()
are now also valid for associate() -- although associate
requires the IEs to be used, the information can be useful
for drivers and should be given.

Signed-off-by: Samuel Ortiz <samuel.ortiz@intel.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 361 insertions, 7 deletions

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index bb8de268a6bf..89dd3793e03c 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -128,6 +128,9 @@ static struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] __read_mostly = {
 		.len = sizeof(struct nl80211_sta_flag_update),
 	},
 	[NL80211_ATTR_CONTROL_PORT] = { .type = NLA_FLAG },
+	[NL80211_ATTR_PRIVACY] = { .type = NLA_FLAG },
+	[NL80211_ATTR_CIPHER_SUITE_GROUP] = { .type = NLA_U32 },
+	[NL80211_ATTR_WPA_VERSIONS] = { .type = NLA_U32 },
 };
 
 /* IE validation */
@@ -347,6 +350,17 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
 	CMD(join_ibss, JOIN_IBSS);
 
 #undef CMD
+
+	if (dev->ops->connect) {
+		i++;
+		NLA_PUT_U32(msg, i, NL80211_CMD_CONNECT);
+	}
+
+	if (dev->ops->disconnect) {
+		i++;
+		NLA_PUT_U32(msg, i, NL80211_CMD_DISCONNECT);
+	}
+
 	nla_nest_end(msg, nl_cmds);
 
 	return genlmsg_end(msg, hdr);
@@ -3001,12 +3015,31 @@ static int nl80211_dump_scan(struct sk_buff *skb,
 
 static bool nl80211_valid_auth_type(enum nl80211_auth_type auth_type)
 {
-	return auth_type == NL80211_AUTHTYPE_OPEN_SYSTEM ||
-		auth_type == NL80211_AUTHTYPE_SHARED_KEY ||
-		auth_type == NL80211_AUTHTYPE_FT ||
-		auth_type == NL80211_AUTHTYPE_NETWORK_EAP;
+	return auth_type <= NL80211_AUTHTYPE_MAX;
+}
+
+static bool nl80211_valid_wpa_versions(u32 wpa_versions)
+{
+	return !(wpa_versions & ~(NL80211_WPA_VERSION_1 |
+				  NL80211_WPA_VERSION_2));
+}
+
+static bool nl80211_valid_akm_suite(u32 akm)
+{
+	return akm == WLAN_AKM_SUITE_8021X ||
+		akm == WLAN_AKM_SUITE_PSK;
+}
+
+static bool nl80211_valid_cipher_suite(u32 cipher)
+{
+	return cipher == WLAN_CIPHER_SUITE_WEP40 ||
+		cipher == WLAN_CIPHER_SUITE_WEP104 ||
+		cipher == WLAN_CIPHER_SUITE_TKIP ||
+		cipher == WLAN_CIPHER_SUITE_CCMP ||
+		cipher == WLAN_CIPHER_SUITE_AES_CMAC;
 }
 
+
 static int nl80211_authenticate(struct sk_buff *skb, struct genl_info *info)
 {
 	struct cfg80211_registered_device *drv;
@@ -3086,6 +3119,68 @@ unlock_rtnl:
 	return err;
 }
 
+static int nl80211_crypto_settings(struct genl_info *info,
+				   struct cfg80211_crypto_settings *settings)
+{
+	settings->control_port = info->attrs[NL80211_ATTR_CONTROL_PORT];
+
+	if (info->attrs[NL80211_ATTR_CIPHER_SUITES_PAIRWISE]) {
+		void *data;
+		int len, i;
+
+		data = nla_data(info->attrs[NL80211_ATTR_CIPHER_SUITES_PAIRWISE]);
+		len = nla_len(info->attrs[NL80211_ATTR_CIPHER_SUITES_PAIRWISE]);
+		settings->n_ciphers_pairwise = len / sizeof(u32);
+
+		if (len % sizeof(u32))
+			return -EINVAL;
+
+		if (settings->n_ciphers_pairwise > NL80211_MAX_NR_CIPHER_SUITES)
+			return -EINVAL;
+
+		memcpy(settings->ciphers_pairwise, data, len);
+
+		for (i = 0; i < settings->n_ciphers_pairwise; i++)
+			if (!nl80211_valid_cipher_suite(
+					settings->ciphers_pairwise[i]))
+				return -EINVAL;
+	}
+
+	if (info->attrs[NL80211_ATTR_CIPHER_SUITE_GROUP]) {
+		settings->cipher_group =
+			nla_get_u32(info->attrs[NL80211_ATTR_CIPHER_SUITE_GROUP]);
+		if (!nl80211_valid_cipher_suite(settings->cipher_group))
+			return -EINVAL;
+	}
+
+	if (info->attrs[NL80211_ATTR_WPA_VERSIONS]) {
+		settings->wpa_versions =
+			nla_get_u32(info->attrs[NL80211_ATTR_WPA_VERSIONS]);
+		if (!nl80211_valid_wpa_versions(settings->wpa_versions))
+			return -EINVAL;
+	}
+
+	if (info->attrs[NL80211_ATTR_AKM_SUITES]) {
+		void *data;
+		int len, i;
+
+		data = nla_data(info->attrs[NL80211_ATTR_AKM_SUITES]);
+		len = nla_len(info->attrs[NL80211_ATTR_AKM_SUITES]);
+		settings->n_akm_suites = len / sizeof(u32);
+
+		if (len % sizeof(u32))
+			return -EINVAL;
+
+		memcpy(settings->akm_suites, data, len);
+
+		for (i = 0; i < settings->n_ciphers_pairwise; i++)
+			if (!nl80211_valid_akm_suite(settings->akm_suites[i]))
+				return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int nl80211_associate(struct sk_buff *skb, struct genl_info *info)
 {
 	struct cfg80211_registered_device *drv;
@@ -3156,9 +3251,9 @@ static int nl80211_associate(struct sk_buff *skb, struct genl_info *info)
 		}
 	}
 
-	req.control_port = info->attrs[NL80211_ATTR_CONTROL_PORT];
-
-	err = drv->ops->assoc(&drv->wiphy, dev, &req);
+	err = nl80211_crypto_settings(info, &req.crypto);
+	if (!err)
+		err = drv->ops->assoc(&drv->wiphy, dev, &req);
 
 out:
 	cfg80211_put_dev(drv);
@@ -3538,6 +3633,130 @@ void cfg80211_testmode_event(struct sk_buff *skb, gfp_t gfp)
 EXPORT_SYMBOL(cfg80211_testmode_event);
 #endif
 
+static int nl80211_connect(struct sk_buff *skb, struct genl_info *info)
+{
+	struct cfg80211_registered_device *drv;
+	struct net_device *dev;
+	struct cfg80211_connect_params connect;
+	struct wiphy *wiphy;
+	int err;
+
+	memset(&connect, 0, sizeof(connect));
+
+	if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
+		return -EINVAL;
+
+	if (!info->attrs[NL80211_ATTR_SSID] ||
+	    !nla_len(info->attrs[NL80211_ATTR_SSID]))
+		return -EINVAL;
+
+	if (info->attrs[NL80211_ATTR_AUTH_TYPE]) {
+		connect.auth_type =
+			nla_get_u32(info->attrs[NL80211_ATTR_AUTH_TYPE]);
+		if (!nl80211_valid_auth_type(connect.auth_type))
+			return -EINVAL;
+	} else
+		connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
+
+	connect.privacy = info->attrs[NL80211_ATTR_PRIVACY];
+
+	err = nl80211_crypto_settings(info, &connect.crypto);
+	if (err)
+		return err;
+	rtnl_lock();
+
+	err = get_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
+	if (err)
+		goto unlock_rtnl;
+
+	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_STATION) {
+		err = -EOPNOTSUPP;
+		goto out;
+	}
+
+	if (!netif_running(dev)) {
+		err = -ENETDOWN;
+		goto out;
+	}
+
+	wiphy = &drv->wiphy;
+
+	connect.bssid = NULL;
+	connect.channel = NULL;
+	connect.auth_type = NL80211_AUTHTYPE_OPEN_SYSTEM;
+
+	if (info->attrs[NL80211_ATTR_MAC])
+		connect.bssid = nla_data(info->attrs[NL80211_ATTR_MAC]);
+	connect.ssid = nla_data(info->attrs[NL80211_ATTR_SSID]);
+	connect.ssid_len = nla_len(info->attrs[NL80211_ATTR_SSID]);
+
+	if (info->attrs[NL80211_ATTR_IE]) {
+		connect.ie = nla_data(info->attrs[NL80211_ATTR_IE]);
+		connect.ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
+	}
+
+	if (info->attrs[NL80211_ATTR_WIPHY_FREQ]) {
+		connect.channel =
+			ieee80211_get_channel(wiphy,
+			    nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]));
+		if (!connect.channel ||
+		    connect.channel->flags & IEEE80211_CHAN_DISABLED) {
+			err = -EINVAL;
+			goto out;
+		}
+	}
+
+	err = cfg80211_connect(drv, dev, &connect);
+
+out:
+	cfg80211_put_dev(drv);
+	dev_put(dev);
+unlock_rtnl:
+	rtnl_unlock();
+	return err;
+}
+
+static int nl80211_disconnect(struct sk_buff *skb, struct genl_info *info)
+{
+	struct cfg80211_registered_device *drv;
+	struct net_device *dev;
+	int err;
+	u16 reason;
+
+	if (!info->attrs[NL80211_ATTR_REASON_CODE])
+		reason = WLAN_REASON_DEAUTH_LEAVING;
+	else
+		reason = nla_get_u16(info->attrs[NL80211_ATTR_REASON_CODE]);
+
+	if (reason == 0)
+		return -EINVAL;
+
+	rtnl_lock();
+
+	err = get_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
+	if (err)
+		goto unlock_rtnl;
+
+	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_STATION) {
+		err = -EOPNOTSUPP;
+		goto out;
+	}
+
+	if (!netif_running(dev)) {
+		err = -ENETDOWN;
+		goto out;
+	}
+
+	err = cfg80211_disconnect(drv, dev, reason);
+
+out:
+	cfg80211_put_dev(drv);
+	dev_put(dev);
+unlock_rtnl:
+	rtnl_unlock();
+	return err;
+}
+
 static struct genl_ops nl80211_ops[] = {
 	{
 		.cmd = NL80211_CMD_GET_WIPHY,
@@ -3759,6 +3978,18 @@ static struct genl_ops nl80211_ops[] = {
 		.flags = GENL_ADMIN_PERM,
 	},
 #endif
+	{
+		.cmd = NL80211_CMD_CONNECT,
+		.doit = nl80211_connect,
+		.policy = nl80211_policy,
+		.flags = GENL_ADMIN_PERM,
+	},
+	{
+		.cmd = NL80211_CMD_DISCONNECT,
+		.doit = nl80211_disconnect,
+		.policy = nl80211_policy,
+		.flags = GENL_ADMIN_PERM,
+	},
 };
 static struct genl_multicast_group nl80211_mlme_mcgrp = {
 	.name = "mlme",
@@ -4077,6 +4308,129 @@ void nl80211_send_assoc_timeout(struct cfg80211_registered_device *rdev,
 				  addr, gfp);
 }
 
+void nl80211_send_connect_result(struct cfg80211_registered_device *rdev,
+				 struct net_device *netdev, const u8 *bssid,
+				 const u8 *req_ie, size_t req_ie_len,
+				 const u8 *resp_ie, size_t resp_ie_len,
+				 u16 status, gfp_t gfp)
+{
+	struct sk_buff *msg;
+	void *hdr;
+
+	msg = nlmsg_new(NLMSG_GOODSIZE, gfp);
+	if (!msg)
+		return;
+
+	hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_CONNECT);
+	if (!hdr) {
+		nlmsg_free(msg);
+		return;
+	}
+
+	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
+	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex);
+	if (bssid)
+		NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, bssid);
+	NLA_PUT_U16(msg, NL80211_ATTR_STATUS_CODE, status);
+	if (req_ie)
+		NLA_PUT(msg, NL80211_ATTR_REQ_IE, req_ie_len, req_ie);
+	if (resp_ie)
+		NLA_PUT(msg, NL80211_ATTR_RESP_IE, resp_ie_len, resp_ie);
+
+	if (genlmsg_end(msg, hdr) < 0) {
+		nlmsg_free(msg);
+		return;
+	}
+
+	genlmsg_multicast(msg, 0, nl80211_mlme_mcgrp.id, gfp);
+	return;
+
+ nla_put_failure:
+	genlmsg_cancel(msg, hdr);
+	nlmsg_free(msg);
+
+}
+
+void nl80211_send_roamed(struct cfg80211_registered_device *rdev,
+			 struct net_device *netdev, const u8 *bssid,
+			 const u8 *req_ie, size_t req_ie_len,
+			 const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
+{
+	struct sk_buff *msg;
+	void *hdr;
+
+	msg = nlmsg_new(NLMSG_GOODSIZE, gfp);
+	if (!msg)
+		return;
+
+	hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_ROAM);
+	if (!hdr) {
+		nlmsg_free(msg);
+		return;
+	}
+
+	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
+	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex);
+	NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, bssid);
+	if (req_ie)
+		NLA_PUT(msg, NL80211_ATTR_REQ_IE, req_ie_len, req_ie);
+	if (resp_ie)
+		NLA_PUT(msg, NL80211_ATTR_RESP_IE, resp_ie_len, resp_ie);
+
+	if (genlmsg_end(msg, hdr) < 0) {
+		nlmsg_free(msg);
+		return;
+	}
+
+	genlmsg_multicast(msg, 0, nl80211_mlme_mcgrp.id, gfp);
+	return;
+
+ nla_put_failure:
+	genlmsg_cancel(msg, hdr);
+	nlmsg_free(msg);
+
+}
+
+void nl80211_send_disconnected(struct cfg80211_registered_device *rdev,
+			       struct net_device *netdev, u16 reason,
+			       u8 *ie, size_t ie_len, bool from_ap, gfp_t gfp)
+{
+	struct sk_buff *msg;
+	void *hdr;
+
+	msg = nlmsg_new(NLMSG_GOODSIZE, gfp);
+	if (!msg)
+		return;
+
+	hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_DISCONNECT);
+	if (!hdr) {
+		nlmsg_free(msg);
+		return;
+	}
+
+	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
+	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex);
+	if (from_ap && reason)
+		NLA_PUT_U16(msg, NL80211_ATTR_REASON_CODE, reason);
+	if (from_ap)
+		NLA_PUT_FLAG(msg, NL80211_ATTR_DISCONNECTED_BY_AP);
+	if (ie)
+		NLA_PUT(msg, NL80211_ATTR_IE, ie_len, ie);
+
+	if (genlmsg_end(msg, hdr) < 0) {
+		nlmsg_free(msg);
+		return;
+	}
+
+	genlmsg_multicast(msg, 0, nl80211_mlme_mcgrp.id, gfp);
+	return;
+
+ nla_put_failure:
+	genlmsg_cancel(msg, hdr);
+	nlmsg_free(msg);
+
+}
+
 void nl80211_send_ibss_bssid(struct cfg80211_registered_device *rdev,
 			     struct net_device *netdev, const u8 *bssid,
 			     gfp_t gfp)