ap: Add AP mode api

Very basic WPA2-PSK only access point mode API with stubs of the start and
stop functions.

Makefile.am

@@ -87,7 +87,8 @@ src_iwd_SOURCES = src/main.c linux/nl80211.h \
 					src/watchlist.h src/watchlist.c \
 					src/ftutil.h src/ftutil.c \
 					src/iwd.h src/eap-sim.c src/eap-aka.c \
-					src/simutil.h src/simutil.c
+					src/simutil.h src/simutil.c \
+					src/ap.h src/ap.c
 src_iwd_LDADD = ell/libell-internal.la -ldl
 
 dist_sysconf_DATA = src/iwd.conf

src/ap.c

@@ -0,0 +1,142 @@
+/*
+ *
+ *  Wireless daemon for Linux
+ *
+ *  Copyright (C) 2017  Intel Corporation. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <errno.h>
+#include <linux/if_ether.h>
+
+#include <ell/ell.h>
+
+#include "src/iwd.h"
+#include "src/device.h"
+#include "src/wiphy.h"
+#include "src/ie.h"
+#include "src/ap.h"
+
+struct ap_state {
+	struct device *device;
+	char *ssid;
+	char *psk;
+	ap_event_cb_t event_cb;
+	int channel;
+	unsigned int ciphers;
+	uint32_t beacon_interval;
+	struct l_uintset *rates;
+};
+
+static struct l_genl_family *nl80211 = NULL;
+
+static struct l_queue *ap_list = NULL;
+
+static void ap_free(void *data)
+{
+	struct ap_state *ap = data;
+
+	l_free(ap->ssid);
+	memset(ap->psk, 0, strlen(ap->psk));
+	l_free(ap->psk);
+
+	if (ap->rates)
+		l_uintset_free(ap->rates);
+
+	l_free(ap);
+}
+
+static void ap_stopped(struct ap_state *ap)
+{
+	ap->event_cb(ap->device, AP_EVENT_STOPPED);
+
+	ap_free(ap);
+
+	l_queue_remove(ap_list, ap);
+}
+
+static bool ap_match_device(const void *a, const void *b)
+{
+	const struct ap_state *ap = a;
+
+	return ap->device == b;
+}
+
+int ap_start(struct device *device, const char *ssid, const char *psk,
+		ap_event_cb_t event_cb)
+{
+	struct wiphy *wiphy = device_get_wiphy(device);
+	struct ap_state *ap;
+
+	if (l_queue_find(ap_list, ap_match_device, device))
+		return -EEXIST;
+
+	ap = l_new(struct ap_state, 1);
+	ap->device = device;
+	ap->ssid = l_strdup(ssid);
+	ap->psk = l_strdup(psk);
+	ap->event_cb = event_cb;
+	/* TODO: Start a Get Survey to decide the channel */
+	ap->channel = 6;
+	/* TODO: Add all ciphers supported by wiphy */
+	ap->ciphers = wiphy_select_cipher(wiphy, 0xffff);
+	ap->beacon_interval = 100;
+	/* TODO: Use actual supported rates */
+	ap->rates = l_uintset_new(200);
+	l_uintset_put(ap->rates, 2); /* 1 Mbps*/
+	l_uintset_put(ap->rates, 11); /* 5.5 Mbps*/
+	l_uintset_put(ap->rates, 22); /* 11 Mbps*/
+
+	if (!ap_list)
+		ap_list = l_queue_new();
+
+	l_queue_push_tail(ap_list, ap);
+
+	return 0;
+}
+
+int ap_stop(struct device *device)
+{
+	struct ap_state *ap = l_queue_find(ap_list, ap_match_device, device);
+
+	if (!ap)
+		return -ENODEV;
+
+	/* TODO: Send NL80211_CMD_STOP_AP */
+	ap_stopped(ap);
+
+	return 0;
+}
+
+void ap_init(struct l_genl_family *in)
+{
+	nl80211 = in;
+
+	/*
+	 * TODO: Check wiphy supports AP mode, supported channels,
+	 * check wiphy's NL80211_ATTR_TX_FRAME_TYPES.
+	 */
+}
+
+void ap_exit(void)
+{
+	l_queue_destroy(ap_list, ap_free);
+}

src/ap.h

@@ -0,0 +1,37 @@
+/*
+ *
+ *  Wireless daemon for Linux
+ *
+ *  Copyright (C) 2017  Intel Corporation. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+enum ap_event {
+	AP_EVENT_STARTED,
+	AP_EVENT_STOPPED,
+};
+
+struct device;
+
+typedef void (*ap_event_cb_t)(struct device *device, enum ap_event event_type);
+
+int ap_start(struct device *device, const char *ssid, const char *psk,
+		ap_event_cb_t event_cb);
+int ap_stop(struct device *device);
+
+void ap_init(struct l_genl_family *in);
+void ap_exit(void);

src/main.c

@@ -43,6 +43,7 @@
 #include "src/wsc.h"
 #include "src/knownnetworks.h"
 #include "src/rfkill.h"
+#include "src/ap.h"
 
 #include "src/backtrace.h"
 
@@ -144,12 +145,15 @@ static void nl80211_appeared(void *user_data)
 
 	if (!wsc_init(nl80211))
 		l_error("Unable to init WSC functionality");
+
+	ap_init(nl80211);
 }
 
 static void nl80211_vanished(void *user_data)
 {
 	l_debug("Lost nl80211 interface");
 
+	ap_exit();
 	wsc_exit();
 	scan_exit();
 	netdev_exit();