wifi: let WEXT be disabled with --with-wext=no

It's still enabled by default if you don't pass --with-wext=no.
But now it's possible to build without WEXT entirely.

Makefile.am

@@ -31,7 +31,8 @@ DISTCHECK_CONFIGURE_FLAGS = \
 	--with-docs=yes \
 	--enable-more-warnings=yes \
 	--with-udev-dir=$$dc_install_base/lib/udev \
-	--with-systemdsystemunitdir=$$dc_install_base/$(systemdsystemunitdir)
+	--with-systemdsystemunitdir=$$dc_install_base/$(systemdsystemunitdir) \
+	--with-wext=no
 
 DISTCLEANFILES = intltool-extract intltool-merge intltool-update
 

configure.ac

@@ -213,6 +213,11 @@ if ! test x"$ac_distver" = x""; then
   AC_DEFINE_UNQUOTED(NM_DIST_VERSION, "$ac_distver", [Define the distribution version string])
 fi
 
+dnl
+dnl Default to using WEXT but allow it to be disabled
+dnl
+AC_ARG_WITH(wext, AS_HELP_STRING([--with-wext=yes], [Enable or disable Linux Wireless Extensions]), ac_with_wext=$withval, ac_with_wext="yes")
+if test x"$ac_with_wext" = x"yes"; then
 	AC_MSG_CHECKING([Linux kernel WEXT headers])
 	AC_COMPILE_IFELSE(
 		[AC_LANG_PROGRAM(
@@ -232,6 +237,11 @@ AC_MSG_RESULT($ac_have_iwevgenie)
 	if test "$ac_have_iwevgenie" = no; then
 	       AC_MSG_ERROR(Linux kernel development header linux/wireless.h not installed or not functional)
 	fi
+	AC_DEFINE(HAVE_WEXT, 1, [Define if you have Linux Wireless Extensions support])
+else
+	AC_DEFINE(HAVE_WEXT, 0, [Define if you have Linux Wireless Extensions support])
+fi
+AM_CONDITIONAL(WITH_WEXT, test x"${ac_with_wext}" = x"yes")
 
 AC_MSG_CHECKING([Linux kernel nl80211 headers])
 AC_COMPILE_IFELSE(
@@ -709,6 +719,7 @@ src/ppp-manager/Makefile
 src/dnsmasq-manager/Makefile
 src/modem-manager/Makefile
 src/bluez-manager/Makefile
+src/wifi/Makefile
 src/firewall-manager/Makefile
 src/settings/Makefile
 src/settings/plugins/Makefile

src/Makefile.am

@@ -12,6 +12,7 @@ SUBDIRS= \
 	modem-manager \
 	bluez-manager \
 	firewall-manager \
+	wifi \
 	settings
 
 if WITH_WIMAX
@@ -36,6 +37,7 @@ INCLUDES = -I${top_srcdir} \
            -I$(top_srcdir)/src/bluez-manager \
            -I$(top_srcdir)/src/firewall-manager \
            -I$(top_srcdir)/src/settings \
+           -I$(top_srcdir)/src/wifi \
            -I${top_srcdir}/libnm-util \
            -I${top_builddir}/libnm-util \
            -I${top_srcdir}/callouts
@@ -118,13 +120,6 @@ NetworkManager_SOURCES = \
 		nm-device-private.h \
 		nm-device-ethernet.c \
 		nm-device-ethernet.h \
-		wifi-utils.c \
-		wifi-utils.h \
-		wifi-utils-private.h \
-		wifi-utils-wext.c \
-		wifi-utils-wext.h \
-		wifi-utils-nl80211.c \
-		wifi-utils-nl80211.h \
 		nm-device-wifi.c \
 		nm-device-wifi.h \
 		nm-device-wired.c \
@@ -304,6 +299,7 @@ NetworkManager_LDADD = \
 	./ppp-manager/libppp-manager.la \
 	./modem-manager/libmodem-manager.la \
 	./bluez-manager/libbluez-manager.la \
+	./wifi/libwifi-utils.la \
 	./firewall-manager/libfirewall-manager.la \
 	./settings/libsettings.la \
 	./backends/libnmbackend.la \

src/nm-manager.c

@@ -2115,9 +2115,6 @@ load_device_factories (NMManager *self)
 static gboolean
 is_wireless (GUdevDevice *device)
 {
-	char phy80211_path[255];
-	struct stat s;
-	const char *path;
 	const char *tmp;
 
 	/* Check devtype, newer kernels (2.6.32+) have this */
@@ -2125,14 +2122,9 @@ is_wireless (GUdevDevice *device)
 	if (g_strcmp0 (tmp, "wlan") == 0)
 		return TRUE;
 
-	/* Check for nl80211 sysfs paths */
-	path = g_udev_device_get_sysfs_path (device);
-	snprintf (phy80211_path, sizeof (phy80211_path), "%s/phy80211", path);
-	if ((stat (phy80211_path, &s) == 0 && (s.st_mode & S_IFDIR)))
-		return TRUE;
-
 	/* Otherwise hit up WEXT directly */
-	return wifi_utils_is_wifi (g_udev_device_get_name (device));
+	return wifi_utils_is_wifi (g_udev_device_get_name (device),
+	                           g_udev_device_get_sysfs_path (device));
 }
 
 static gboolean

src/settings/plugins/ifcfg-rh/Makefile.am

@@ -23,6 +23,7 @@ libifcfg_rh_io_la_SOURCES = \
 	utils.h
 
 INCLUDES = \
+	-I$(top_srcdir)/src/wifi \
 	-I$(top_srcdir)/src/settings \
 	-I$(top_srcdir)/include \
 	-I$(top_builddir)/include \
@@ -38,6 +39,7 @@ libifcfg_rh_io_la_CPPFLAGS = \
 	-DSBINDIR=\"$(sbindir)\"
 
 libifcfg_rh_io_la_LIBADD = \
+	$(top_builddir)/src/wifi/libwifi-utils.la \
 	$(top_builddir)/libnm-util/libnm-util.la \
 	$(GLIB_LIBS) \
 	$(NSS_LIBS)

src/settings/plugins/ifcfg-rh/reader.c

@@ -32,7 +32,6 @@
 #include <unistd.h>
 #include <netinet/ether.h>
 #include <linux/if.h>
-#include <linux/wireless.h>
 
 #include <glib.h>
 #include <glib/gi18n.h>
@@ -48,6 +47,8 @@
 #include <nm-setting-bond.h>
 #include <nm-utils.h>
 
+#include "wifi-utils.h"
+
 #include "common.h"
 #include "shvar.h"
 #include "utils.h"
@@ -3544,47 +3545,6 @@ infiniband_connection_from_ifcfg (const char *file,
 	return connection;
 }
 
-static gboolean
-is_wireless_device (const char *iface)
-{
-	int fd;
-	struct iw_range range;
-	struct iwreq wrq;
-	gboolean is_wireless = FALSE;
-
-	g_return_val_if_fail (iface != NULL, FALSE);
-
-	fd = socket(AF_INET, SOCK_DGRAM, 0);
-	if (fd == -1)
-		return FALSE;
-
-	memset (&wrq, 0, sizeof (struct iwreq));
-	memset (&range, 0, sizeof (struct iw_range));
-	strncpy (wrq.ifr_name, iface, IFNAMSIZ);
-	wrq.u.data.pointer = (caddr_t) &range;
-	wrq.u.data.length = sizeof (struct iw_range);
-
-	if (ioctl (fd, SIOCGIWRANGE, &wrq) == 0)
-		is_wireless = TRUE;
-	else {
-		if (errno == EOPNOTSUPP)
-			is_wireless = FALSE;
-		else {
-			/* Sigh... some wired devices (kvm/qemu) return EINVAL when the
-			 * device is down even though it's not a wireless device.  So try
-			 * IWNAME as a fallback.
-			 */
-			memset (&wrq, 0, sizeof (struct iwreq));
-			strncpy (wrq.ifr_name, iface, IFNAMSIZ);
-			if (ioctl (fd, SIOCGIWNAME, &wrq) == 0)
-				is_wireless = TRUE;
-		}
-	}
-
-	close (fd);
-	return is_wireless;
-}
-
 static void
 handle_bond_option (NMSettingBond *s_bond,
                     const char *key,
@@ -4012,7 +3972,7 @@ connection_from_file (const char *filename,
 			else if (is_vlan_device (device, parsed))
 				type = g_strdup (TYPE_VLAN);
 			/* Test wireless extensions */
-			else if (is_wireless_device (device))
+			else if (wifi_utils_is_wifi (device, NULL))
 				type = g_strdup (TYPE_WIRELESS);
 			else
 				type = g_strdup (TYPE_ETHERNET);

src/settings/plugins/ifcfg-rh/tests/Makefile.am

@@ -21,6 +21,7 @@ test_ifcfg_rh_CPPFLAGS = \
 test_ifcfg_rh_LDADD = \
 	$(top_builddir)/libnm-glib/libnm-glib.la \
 	$(top_builddir)/libnm-util/libnm-util.la \
+	$(top_builddir)/src/wifi/libwifi-utils.la \
 	$(builddir)/../libifcfg-rh-io.la \
 	$(DBUS_LIBS)
 

src/supplicant-manager/nm-supplicant-interface.c

@@ -19,6 +19,7 @@
  * Copyright (C) 2006 - 2008 Novell, Inc.
  */
 
+#include <config.h>
 #include <stdio.h>
 #include <string.h>
 #include <glib.h>
@@ -804,6 +805,12 @@ interface_add_cb (DBusGProxy *proxy,
 	}
 }
 
+#if HAVE_WEXT
+#define DEFAULT_WIFI_DRIVER "nl80211,wext"
+#else
+#define DEFAULT_WIFI_DRIVER "nl80211"
+#endif
+
 static void
 interface_add (NMSupplicantInterface *self, gboolean is_wireless)
 {
@@ -832,7 +839,7 @@ interface_add (NMSupplicantInterface *self, gboolean is_wireless)
 
 	driver = g_new0 (GValue, 1);
 	g_value_init (driver, G_TYPE_STRING);
-	g_value_set_string (driver, is_wireless ? "nl80211,wext" : "wired");
+	g_value_set_string (driver, is_wireless ? DEFAULT_WIFI_DRIVER : "wired");
 	g_hash_table_insert (hash, "Driver", driver);
 
 	ifname = g_new0 (GValue, 1);

src/wifi/wifi-utils-nl80211.c

@@ -73,17 +73,16 @@ static int error_handler (struct sockaddr_nl *nla, struct nlmsgerr *err,
 	return NL_SKIP;
 }
 
-static struct nl_msg *nl80211_alloc_msg (WifiDataNl80211 *nl80211,
-					 guint32 cmd, guint32 flags)
+static struct nl_msg *
+_nl80211_alloc_msg (int id, int ifindex, guint32 cmd, guint32 flags)
 {
-	struct nl_msg *msg = nlmsg_alloc ();
-	if (!msg)
-		return NULL;
-
-	genlmsg_put (msg, 0, 0, nl80211->id, 0, flags, cmd, 0);
-
-	NLA_PUT_U32 (msg, NL80211_ATTR_IFINDEX, nl80211->parent.ifindex);
+	struct nl_msg *msg;
 
+	msg = nlmsg_alloc ();
+	if (msg) {
+		genlmsg_put (msg, 0, 0, id, 0, flags, cmd, 0);
+		NLA_PUT_U32 (msg, NL80211_ATTR_IFINDEX, ifindex);
+	}
 	return msg;
 
  nla_put_failure:
@@ -91,7 +90,16 @@ static struct nl_msg *nl80211_alloc_msg (WifiDataNl80211 *nl80211,
 	return NULL;
 }
 
-static int nl80211_send_and_recv (WifiDataNl80211 *nl80211,
+static struct nl_msg *
+nl80211_alloc_msg (WifiDataNl80211 *nl80211, guint32 cmd, guint32 flags)
+{
+	return _nl80211_alloc_msg (nl80211->id, nl80211->parent.ifindex, cmd, flags);
+}
+
+/* NOTE: this function consumes 'msg' */
+static int
+_nl80211_send_and_recv (struct nl_sock *nl_sock, 
+                        struct nl_cb *nl_cb,
                         struct nl_msg *msg,
                         int (*valid_handler)(struct nl_msg *, void *),
                         void *valid_data)
@@ -99,36 +107,42 @@ static int nl80211_send_and_recv (WifiDataNl80211 *nl80211,
 	struct nl_cb *cb;
 	int err;
 
-	if (msg == NULL)
-		return -ENOMEM;
-
+	g_return_val_if_fail (msg != NULL, -ENOMEM);
 	g_return_val_if_fail (valid_handler != NULL, -EINVAL);
 
-	cb = nl_cb_clone (nl80211->nl_cb);
+	cb = nl_cb_clone (nl_cb);
 	if (!cb) {
 		err = -ENOMEM;
 		goto out;
 	}
 
-	err = nl_send_auto_complete (nl80211->nl_sock, msg);
+	err = nl_send_auto_complete (nl_sock, msg);
 	if (err < 0)
 		goto out;
 
 	err = 1;
-
 	nl_cb_err (cb, NL_CB_CUSTOM, error_handler, &err);
 	nl_cb_set (cb, NL_CB_FINISH, NL_CB_CUSTOM, finish_handler, &err);
 	nl_cb_set (cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &err);
 	nl_cb_set (cb, NL_CB_VALID, NL_CB_CUSTOM, valid_handler, valid_data);
 
 	while (err > 0)
-		nl_recvmsgs (nl80211->nl_sock, cb);
+		nl_recvmsgs (nl_sock, cb);
+
  out:
 	nl_cb_put (cb);
 	nlmsg_free (msg);
 	return err;
 }
 
+static int
+nl80211_send_and_recv (WifiDataNl80211 *nl80211,
+                       struct nl_msg *msg,
+                       int (*valid_handler)(struct nl_msg *, void *),
+                       void *valid_data)
+{
+	return _nl80211_send_and_recv (nl80211->nl_sock, nl80211->nl_cb, msg, valid_handler, valid_data);
+}
 
 static void
 wifi_nl80211_deinit (WifiData *parent)
@@ -186,9 +200,6 @@ wifi_nl80211_get_mode (WifiData *data)
 		return NM_802_11_MODE_UNKNOWN;
 
 	return iface_info.mode;
-	return NM_802_11_MODE_INFRA;
-	return NM_802_11_MODE_ADHOC;
-	return NM_802_11_MODE_UNKNOWN;
 }
 
 static gboolean
@@ -730,3 +741,69 @@ error:
 	wifi_utils_deinit ((WifiData *) nl80211);
 	return NULL;
 }
+
+static int
+iface_to_index (struct nl_sock *nl_sock, const char *iface)
+{
+	struct nl_cache *link_cache;
+	int err, ifindex;
+
+	/* name to index */
+	err = rtnl_link_alloc_cache (nl_sock, &link_cache);
+	if (err < 0) {
+		nm_log_warn (LOGD_HW, "failed to allocate link cache");
+		return -1;
+	}
+	nl_cache_mngt_provide (link_cache);
+	nl_cache_refill (nl_sock, link_cache);
+	ifindex = rtnl_link_name2i (link_cache, iface);
+	nl_cache_free (link_cache);
+
+	return ifindex;
+}
+
+gboolean
+wifi_nl80211_is_wifi (const char *iface)
+{
+	struct nl_sock *nl_sock;
+	struct nl_cb *nl_cb = NULL;
+	struct nl_msg *msg = NULL;
+	int id, ifindex;
+	struct nl80211_iface_info iface_info = {
+		.mode = NM_802_11_MODE_UNKNOWN,
+	};
+	gboolean is_wifi = FALSE;
+
+	nl_sock = nl_socket_alloc ();
+	if (nl_sock == NULL)
+		return FALSE;
+
+	ifindex = iface_to_index (nl_sock, iface);
+	if (index < 0)
+		return FALSE;
+
+	if (genl_connect (nl_sock))
+		goto error;
+
+	id = genl_ctrl_resolve (nl_sock, "nl80211");
+	if (id < 0)
+		goto error;
+
+	nl_cb = nl_cb_alloc (NL_CB_DEFAULT);
+	if (nl_cb) {
+		msg = _nl80211_alloc_msg (id, ifindex, NL80211_CMD_GET_INTERFACE, 0);
+		if (_nl80211_send_and_recv (nl_sock,
+			                        nl_cb,
+			                        msg,
+			                        nl80211_iface_info_handler,
+			                        &iface_info) >= 0)
+			is_wifi = (iface_info.mode != NM_802_11_MODE_UNKNOWN);
+	}
+
+ error:
+	if (nl_cb)
+		nl_cb_put (nl_cb);
+	nl_socket_free (nl_sock);
+	return is_wifi;
+}
+

src/wifi/wifi-utils-nl80211.h

@@ -25,4 +25,6 @@
 
 WifiData *wifi_nl80211_init (const char *iface, int ifindex);
 
+gboolean wifi_nl80211_is_wifi (const char *iface);
+
 #endif  /* WIFI_UTILS_NL80211_H */

src/wifi/wifi-utils.c

@@ -20,13 +20,17 @@
  */
 
 #include <config.h>
+#include <sys/stat.h>
+#include <stdio.h>
 #include <string.h>
 #include <glib.h>
 
 #include "wifi-utils.h"
 #include "wifi-utils-private.h"
-#include "wifi-utils-wext.h"
 #include "wifi-utils-nl80211.h"
+#if HAVE_WEXT
+#include "wifi-utils-wext.h"
+#endif
 
 gpointer
 wifi_data_new (const char *iface, int ifindex, gsize len)
@@ -58,10 +62,12 @@ wifi_utils_init (const char *iface, int ifindex, gboolean check_scan)
 	g_return_val_if_fail (ifindex > 0, NULL);
 
 	ret = wifi_nl80211_init (iface, ifindex);
-	if (ret != NULL)
+	if (ret == NULL) {
+#if HAVE_WEXT
+		ret = wifi_wext_init (iface, ifindex, check_scan);
+#endif
+	}
 	return ret;
-
-	return wifi_wext_init (iface, ifindex, check_scan);
 }
 
 NMDeviceWifiCapabilities
@@ -151,12 +157,27 @@ wifi_utils_deinit (WifiData *data)
 }
 
 gboolean
-wifi_utils_is_wifi (const char *iface)
+wifi_utils_is_wifi (const char *iface, const char *sysfs_path)
 {
+	char phy80211_path[255];
+	struct stat s;
+
 	g_return_val_if_fail (iface != NULL, FALSE);
 
+	if (sysfs_path) {
+		/* Check for nl80211 sysfs paths */
+		snprintf (phy80211_path, sizeof (phy80211_path), "%s/phy80211", sysfs_path);
+		if ((stat (phy80211_path, &s) == 0 && (s.st_mode & S_IFDIR)))
+			return TRUE;
+	}
+
+	if (wifi_nl80211_is_wifi (iface))
+		return TRUE;
+
+#if HAVE_WEXT
 	if (wifi_wext_is_wifi (iface))
 		return TRUE;
+#endif
 
 	return FALSE;
 }

src/wifi/wifi-utils.h

@@ -29,7 +29,7 @@
 
 typedef struct WifiData WifiData;
 
-gboolean wifi_utils_is_wifi (const char *iface);
+gboolean wifi_utils_is_wifi (const char *iface, const char *sysfs_path);
 
 WifiData *wifi_utils_init (const char *iface, int ifindex, gboolean check_scan);