Patchwork [PATCH/RFC,02/18] mesh: add mesh mode routines

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Submitter Bob Copeland
Date July 14, 2014, 5:19 a.m.
Message ID <1405315163-9492-3-git-send-email-me@bobcopeland.com>
Download mbox | patch
Permalink /patch/369493/
State Superseded
Headers show

Comments

Bob Copeland - July 14, 2014, 5:19 a.m.
From: Thomas Pedersen <thomas@noack.us>

Add routines to (de)initialize mesh interface data structures and
join and leave mesh networks.

Signed-off-by: Javier Lopez <jlopex@gmail.com>
Signed-off-by: Javier Cardona <javier@cozybit.com>
Signed-off-by: Jason Mobarak <x@jason.mobarak.name>
Signed-hostap: Thomas Pedersen <thomas@noack.us>
---
 wpa_supplicant/mesh.c | 277 ++++++++++++++++++++++++++++++++++++++++++++++++++
 wpa_supplicant/mesh.h |  36 +++++++
 2 files changed, 313 insertions(+)
 create mode 100644 wpa_supplicant/mesh.c
 create mode 100644 wpa_supplicant/mesh.h

Patch

diff --git a/wpa_supplicant/mesh.c b/wpa_supplicant/mesh.c
new file mode 100644
index 0000000..5b4f5d9
--- /dev/null
+++ b/wpa_supplicant/mesh.c
@@ -0,0 +1,277 @@ 
+/*
+ * WPA Supplicant - Basic mesh mode routines
+ * Copyright (c) 2013-2014, cozybit, Inc.  All rights reserved.
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "mesh.h"
+
+static void
+wpa_supplicant_mesh_deinit(struct wpa_supplicant *wpa_s)
+{
+	wpa_supplicant_mesh_iface_deinit(wpa_s, wpa_s->ifmsh);
+	wpa_s->ifmsh = NULL;
+	/* TODO: leave mesh (stop beacon). This will happen on link down
+	 * anyway, so it's not urgent */
+}
+
+void wpa_supplicant_mesh_iface_deinit(struct wpa_supplicant *wpa_s,
+				      struct hostapd_iface *ifmsh)
+{
+	if (!ifmsh)
+		return;
+
+	if (ifmsh->mconf) {
+		if (ifmsh->mconf->ies)
+			ifmsh->mconf->ies = NULL;
+			/* We cannot free this struct
+			 * because wpa_authenticator on
+			 * hostapd side is also using it
+			 * for now just set to NULL and
+			 * let hostapd code free it.
+			 */
+		os_free(ifmsh->mconf);
+		ifmsh->mconf = NULL;
+	}
+
+	/* take care of shared data */
+	hostapd_interface_deinit(ifmsh);
+	hostapd_interface_free(ifmsh);
+}
+
+static struct mesh_conf *
+mesh_config_create(struct wpa_ssid *ssid)
+{
+	struct mesh_conf *conf;
+
+	conf = os_zalloc(sizeof(struct mesh_conf));
+	if (!conf)
+		return NULL;
+
+	os_memcpy(conf->meshid, ssid->ssid, ssid->ssid_len);
+	conf->meshid_len = ssid->ssid_len;
+
+	if (ssid->key_mgmt & WPA_KEY_MGMT_SAE)
+		conf->security |= MESH_CONF_SEC_AUTH |
+				  MESH_CONF_SEC_AMPE;
+	else
+		conf->security |= MESH_CONF_SEC_NONE;
+
+	/* defaults */
+	conf->mesh_pp_id = MESH_PATH_PROTOCOL_HWMP;
+	conf->mesh_pm_id = MESH_PATH_METRIC_AIRTIME;
+	conf->mesh_cc_id = 0;
+	conf->mesh_sp_id = MESH_SYNC_METHOD_NEIGHBOR_OFFSET;
+	conf->mesh_auth_id = (conf->security & MESH_CONF_SEC_AUTH) ? 1 : 0;
+
+	return conf;
+}
+
+static int
+wpa_supplicant_mesh_init(struct wpa_supplicant *wpa_s,
+			 struct wpa_ssid *ssid)
+{
+	struct hostapd_iface *ifmsh;
+	struct hostapd_data *bss;
+	struct hostapd_config *conf;
+	struct mesh_conf *mconf;
+	int basic_rates_erp[] = {10, 20, 55, 60, 110, 120, 240, -1 };
+	static int default_groups[] = { 19, 20, 21, 25, 26 };
+	size_t len;
+
+	wpa_s->ifmsh = ifmsh = os_zalloc(sizeof(*wpa_s->ifmsh));
+	if (!ifmsh)
+		return -ENOMEM;
+
+	ifmsh->num_bss = 1;
+	ifmsh->bss = os_calloc(wpa_s->ifmsh->num_bss,
+			       sizeof(struct hostapd_data *));
+	if (!ifmsh->bss)
+		goto out_free;
+
+	ifmsh->bss[0] = bss = os_zalloc(sizeof(struct hostapd_data));
+	if (!bss)
+		goto out_free;
+
+	os_memcpy(bss->own_addr, wpa_s->own_addr, ETH_ALEN);
+	bss->driver = wpa_s->driver;
+	bss->drv_priv = wpa_s->drv_priv;
+	bss->iface = ifmsh;
+	wpa_s->assoc_freq = ssid->frequency;
+	wpa_s->current_ssid = ssid;
+
+	/* setup an AP config for auth processing */
+	conf = hostapd_config_defaults();
+	if (!conf)
+		goto out_free;
+
+	bss->conf = *conf->bss;
+	bss->conf->start_disabled = 1;
+	bss->conf->mesh = MESH_ENABLED;
+	bss->iconf = conf;
+	ifmsh->conf = conf;
+
+	ifmsh->bss[0]->max_plinks = 99;
+	os_strlcpy(bss->conf->iface, wpa_s->ifname, sizeof(bss->conf->iface));
+
+	mconf = mesh_config_create(ssid);
+	if (!mconf)
+		goto out_free;
+	ifmsh->mconf = mconf;
+
+	/* need conf->hw_mode for supported rates. */
+	/* c.f. wpa_supplicant/ap.c:wpa_supplicant_conf_ap() */
+	if (ssid->frequency == 0) {
+		conf->hw_mode = HOSTAPD_MODE_IEEE80211G;
+		conf->channel = 1;
+	} else if (ssid->frequency >= 2412 && ssid->frequency <= 2472) {
+		conf->hw_mode = HOSTAPD_MODE_IEEE80211G;
+		conf->channel = (ssid->frequency - 2407) / 5;
+	} else if ((ssid->frequency >= 5180 && ssid->frequency <= 5240) ||
+		   (ssid->frequency >= 5745 && ssid->frequency <= 5825)) {
+		conf->hw_mode = HOSTAPD_MODE_IEEE80211A;
+		conf->channel = (ssid->frequency - 5000) / 5;
+	} else if (ssid->frequency >= 56160 + 2160 * 1 &&
+		   ssid->frequency <= 56160 + 2160 * 4) {
+		conf->hw_mode = HOSTAPD_MODE_IEEE80211AD;
+		conf->channel = (ssid->frequency - 56160) / 2160;
+	} else {
+		wpa_printf(MSG_ERROR, "Unsupported mesh mode frequency: %d MHz",
+			   ssid->frequency);
+		goto out_free;
+	}
+
+	/* XXX: hack! this is so an MPM which correctly sets the ERP
+	 * mandatory rates as BSSBasicRateSet doesn't reject us. We
+	 * could add a new hw_mode HOSTAPD_MODE_IEEE80211G_ERP, but
+	 * this is way easier. This also makes our BSSBasicRateSet
+	 * advertised in beacons match the one in peering frames, sigh.
+	 * */
+	if (conf->hw_mode == HOSTAPD_MODE_IEEE80211G) {
+		conf->basic_rates = os_zalloc(sizeof(basic_rates_erp));
+		if (!conf->basic_rates)
+			goto out_free;
+		os_memcpy(conf->basic_rates,
+			  basic_rates_erp, sizeof(basic_rates_erp));
+	}
+
+	hostapd_setup_interface(ifmsh);
+
+	if (wpa_drv_init_mesh(wpa_s)) {
+		wpa_msg(wpa_s, MSG_ERROR, "failed to init mesh in driver");
+		return -1;
+	}
+
+	if (mconf->security != MESH_CONF_SEC_NONE) {
+		bss->conf->wpa = ssid->proto;
+		bss->conf->wpa_key_mgmt = ssid->key_mgmt;
+		bss->conf->sae_groups = wpa_s->conf->sae_groups;
+
+		if (wpa_s->conf->sae_groups) {
+			bss->conf->sae_groups =
+				os_zalloc(sizeof(wpa_s->conf->sae_groups));
+			os_memcpy(bss->conf->sae_groups,
+				  wpa_s->conf->sae_groups,
+				  sizeof(wpa_s->conf->sae_groups));
+		} else {
+			bss->conf->sae_groups =
+				os_zalloc(sizeof(default_groups));
+			os_memcpy(bss->conf->sae_groups,
+				  default_groups,
+				  sizeof(default_groups));
+		}
+
+		len = os_strlen(ssid->passphrase);
+		bss->conf->ssid.wpa_passphrase =
+			dup_binstr(ssid->passphrase, len);
+	}
+
+	return 0;
+out_free:
+	wpa_supplicant_mesh_deinit(wpa_s);
+	return -ENOMEM;
+}
+
+void wpa_mesh_notify_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
+			  const u8 *ies, int ie_len)
+{
+	struct ieee802_11_elems elems;
+
+	wpa_msg(wpa_s, MSG_INFO,
+		"new peer notification for " MACSTR, MAC2STR(addr));
+
+	if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed) {
+		wpa_msg(wpa_s, MSG_INFO, "Could not parse beacon from " MACSTR,
+			MAC2STR(addr));
+	}
+}
+
+int wpa_supplicant_join_mesh(struct wpa_supplicant *wpa_s,
+			     struct wpa_ssid *ssid)
+{
+	struct wpa_driver_mesh_join_params params;
+	int ret = 0;
+
+	if (!ssid || !ssid->ssid || !ssid->ssid_len || !ssid->frequency) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	wpa_supplicant_mesh_deinit(wpa_s);
+
+	os_memset(&params, 0, sizeof(params));
+	params.meshid = ssid->ssid;
+	params.meshid_len = ssid->ssid_len;
+	params.freq = ssid->frequency;
+
+	if (ssid->key_mgmt & WPA_KEY_MGMT_SAE) {
+		params.flags |= WPA_DRIVER_MESH_FLAG_SAE_AUTH;
+		params.flags |= WPA_DRIVER_MESH_FLAG_AMPE;
+	}
+
+	params.flags |= WPA_DRIVER_MESH_FLAG_DRIVER_MPM;
+	params.conf.flags |= WPA_DRIVER_MESH_CONF_FLAG_AUTO_PLINKS;
+
+	if (wpa_supplicant_mesh_init(wpa_s, ssid)) {
+		wpa_msg(wpa_s, MSG_ERROR, "failed to init mesh");
+		goto out;
+	}
+
+	if (wpa_s->ifmsh) {
+		params.ies = wpa_s->ifmsh->mconf->ies;
+		params.ie_len = wpa_s->ifmsh->mconf->ie_len;
+		params.basic_rates = wpa_s->ifmsh->basic_rates;
+	}
+
+	wpa_msg(wpa_s, MSG_INFO, "joining mesh %s",
+		wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
+	ret = wpa_drv_join_mesh(wpa_s, &params);
+	if (ret)
+		wpa_msg(wpa_s, MSG_ERROR, "mesh join error=%d\n", ret);
+
+	/* hostapd sets the interface down until we associate */
+	wpa_drv_set_operstate(wpa_s, 1);
+
+out:
+	return ret;
+}
+
+int wpa_supplicant_leave_mesh(struct wpa_supplicant *wpa_s)
+{
+	int ret = 0;
+
+	wpa_msg(wpa_s, MSG_INFO, "leaving mesh");
+
+	ret = wpa_drv_leave_mesh(wpa_s);
+
+	if (ret)
+		wpa_msg(wpa_s, MSG_ERROR, "mesh leave error=%d\n", ret);
+
+	wpa_drv_set_operstate(wpa_s, 1);
+
+	wpa_supplicant_mesh_deinit(wpa_s);
+
+	return ret;
+}
diff --git a/wpa_supplicant/mesh.h b/wpa_supplicant/mesh.h
new file mode 100644
index 0000000..f08e641
--- /dev/null
+++ b/wpa_supplicant/mesh.h
@@ -0,0 +1,36 @@ 
+/*
+ * WPA Supplicant - Basic mesh mode routines
+ * Copyright (c) 2013-2014, cozybit, Inc.  All rights reserved.
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#ifndef MESH_H
+#define MESH_H
+#include "utils/includes.h"
+
+#include "utils/common.h"
+#include "utils/eloop.h"
+#include "utils/uuid.h"
+#include "common/ieee802_11_defs.h"
+#include "common/wpa_ctrl.h"
+#include "common/ieee802_11_defs.h"
+#include "config_ssid.h"
+#include "config.h"
+#include "wpa_supplicant_i.h"
+#include "driver_i.h"
+#include "notify.h"
+
+#include "ap/sta_info.h"
+#include "ap/hostapd.h"
+#include "ap/ieee802_11.h"
+
+int wpa_supplicant_join_mesh(struct wpa_supplicant *wpa_s,
+			     struct wpa_ssid *ssid);
+int wpa_supplicant_leave_mesh(struct wpa_supplicant *wpa_s);
+void wpa_mesh_notify_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
+			  const u8 *ies, int ie_len);
+void wpa_supplicant_mesh_iface_deinit(struct wpa_supplicant *wpa_s,
+				      struct hostapd_iface *ifmsh);
+#endif /* MESH_H */