ap.c

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/*
 * WPA Supplicant - Basic AP mode support routines
 * Copyright (c) 2003-2009, Jouni Malinen <j@w1.fi>
 * Copyright (c) 2009, Atheros Communications
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "utils/includes.h"

#include "utils/common.h"
#include "common/ieee802_11_defs.h"
#include "ap/hostapd.h"
#include "ap/ap_config.h"
#ifdef NEED_AP_MLME
#include "ap/ieee802_11.h"
#endif /* NEED_AP_MLME */
#include "ap/ieee802_1x.h"
#include "ap/wps_hostapd.h"
#include "ap/ctrl_iface_ap.h"
#include "eap_common/eap_defs.h"
#include "eap_server/eap_methods.h"
#include "eap_common/eap_wsc_common.h"
#include "wps/wps.h"
#include "config_ssid.h"
#include "config.h"
#include "wpa_supplicant_i.h"
#include "driver_i.h"
#include "ap.h"


static int wpa_supplicant_conf_ap(struct wpa_supplicant *wpa_s,
                                  struct wpa_ssid *ssid,
                                  struct hostapd_config *conf)
{
        struct hostapd_bss_config *bss = &conf->bss[0];
        int pairwise;

        conf->driver = wpa_s->driver;

        os_strlcpy(bss->iface, wpa_s->ifname, sizeof(bss->iface));

        if (ssid->frequency == 0) {
                /* default channel 11 */
                conf->hw_mode = HOSTAPD_MODE_IEEE80211G;
                conf->channel = 11;
        } 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 {
                wpa_printf(MSG_ERROR, "Unsupported AP mode frequency: %d MHz",
                           ssid->frequency);
                return -1;
        }

        /* TODO: enable HT if driver supports it;
         * drop to 11b if driver does not support 11g */

        if (ssid->ssid_len == 0) {
                wpa_printf(MSG_ERROR, "No SSID configured for AP mode");
                return -1;
        }
        os_memcpy(bss->ssid.ssid, ssid->ssid, ssid->ssid_len);
        bss->ssid.ssid[ssid->ssid_len] = '\0';
        bss->ssid.ssid_len = ssid->ssid_len;
        bss->ssid.ssid_set = 1;

        if (wpa_key_mgmt_wpa_psk(ssid->key_mgmt))
                bss->wpa = ssid->proto;
        bss->wpa_key_mgmt = ssid->key_mgmt;
        bss->wpa_pairwise = ssid->pairwise_cipher;
        if (ssid->passphrase) {
                bss->ssid.wpa_passphrase = os_strdup(ssid->passphrase);
        } else if (ssid->psk_set) {
                os_free(bss->ssid.wpa_psk);
                bss->ssid.wpa_psk = os_zalloc(sizeof(struct hostapd_wpa_psk));
                if (bss->ssid.wpa_psk == NULL)
                        return -1;
                os_memcpy(bss->ssid.wpa_psk->psk, ssid->psk, PMK_LEN);
                bss->ssid.wpa_psk->group = 1;
        }

        /* Select group cipher based on the enabled pairwise cipher suites */
        pairwise = 0;
        if (bss->wpa & 1)
                pairwise |= bss->wpa_pairwise;
        if (bss->wpa & 2) {
                if (bss->rsn_pairwise == 0)
                        bss->rsn_pairwise = bss->wpa_pairwise;
                pairwise |= bss->rsn_pairwise;
        }
        if (pairwise & WPA_CIPHER_TKIP)
                bss->wpa_group = WPA_CIPHER_TKIP;
        else
                bss->wpa_group = WPA_CIPHER_CCMP;

        if (bss->wpa && bss->ieee802_1x)
                bss->ssid.security_policy = SECURITY_WPA;
        else if (bss->wpa)
                bss->ssid.security_policy = SECURITY_WPA_PSK;
        else if (bss->ieee802_1x) {
                bss->ssid.security_policy = SECURITY_IEEE_802_1X;
                bss->ssid.wep.default_len = bss->default_wep_key_len;
        } else if (bss->ssid.wep.keys_set)
                bss->ssid.security_policy = SECURITY_STATIC_WEP;
        else
                bss->ssid.security_policy = SECURITY_PLAINTEXT;

#ifdef CONFIG_WPS
        /*
         * Enable WPS by default, but require user interaction to actually use
         * it. Only the internal Registrar is supported.
         */
        bss->eap_server = 1;
        bss->wps_state = 2;
        bss->ap_setup_locked = 1;
        if (wpa_s->conf->config_methods)
                bss->config_methods = os_strdup(wpa_s->conf->config_methods);
        if (wpa_s->conf->device_type)
                bss->device_type = os_strdup(wpa_s->conf->device_type);
#endif /* CONFIG_WPS */

        return 0;
}


static void ap_public_action_rx(void *ctx, const u8 *buf, size_t len, int freq)
{
}


static int ap_probe_req_rx(void *ctx, const u8 *addr, const u8 *ie,
                           size_t ie_len)
{
        return 0;
}


static void ap_wps_reg_success_cb(void *ctx, const u8 *mac_addr,
                                  const u8 *uuid_e)
{
}


int wpa_supplicant_create_ap(struct wpa_supplicant *wpa_s,
                             struct wpa_ssid *ssid)
{
        struct wpa_driver_associate_params params;
        struct hostapd_iface *hapd_iface;
        struct hostapd_config *conf;
        size_t i;

        if (ssid->ssid == NULL || ssid->ssid_len == 0) {
                wpa_printf(MSG_ERROR, "No SSID configured for AP mode");
                return -1;
        }

        wpa_supplicant_ap_deinit(wpa_s);

        wpa_printf(MSG_DEBUG, "Setting up AP (SSID='%s')",
                   wpa_ssid_txt(ssid->ssid, ssid->ssid_len));

        os_memset(&params, 0, sizeof(params));
        params.ssid = ssid->ssid;
        params.ssid_len = ssid->ssid_len;
        switch (ssid->mode) {
        case WPAS_MODE_INFRA:
                params.mode = IEEE80211_MODE_INFRA;
                break;
        case WPAS_MODE_IBSS:
                params.mode = IEEE80211_MODE_IBSS;
                break;
        case WPAS_MODE_AP:
                params.mode = IEEE80211_MODE_AP;
                break;
        }
        params.freq = ssid->frequency;

        if (ssid->key_mgmt & WPA_KEY_MGMT_PSK)
                wpa_s->key_mgmt = WPA_KEY_MGMT_PSK;
        else
                wpa_s->key_mgmt = WPA_KEY_MGMT_NONE;
        params.key_mgmt_suite = key_mgmt2driver(wpa_s->key_mgmt);

        if (ssid->pairwise_cipher & WPA_CIPHER_CCMP)
                wpa_s->pairwise_cipher = WPA_CIPHER_CCMP;
        else if (ssid->pairwise_cipher & WPA_CIPHER_TKIP)
                wpa_s->pairwise_cipher = WPA_CIPHER_TKIP;
        else if (ssid->pairwise_cipher & WPA_CIPHER_NONE)
                wpa_s->pairwise_cipher = WPA_CIPHER_NONE;
        else {
                wpa_printf(MSG_WARNING, "WPA: Failed to select pairwise "
                           "cipher.");
                return -1;
        }
        params.pairwise_suite = cipher_suite2driver(wpa_s->pairwise_cipher);
        params.group_suite = params.pairwise_suite;

        if (wpa_drv_associate(wpa_s, &params) < 0) {
                wpa_msg(wpa_s, MSG_INFO, "Failed to start AP functionality");
                return -1;
        }

        wpa_s->ap_iface = hapd_iface = os_zalloc(sizeof(*wpa_s->ap_iface));
        if (hapd_iface == NULL)
                return -1;
        hapd_iface->owner = wpa_s;

        wpa_s->ap_iface->conf = conf = hostapd_config_defaults();
        if (conf == NULL) {
                wpa_supplicant_ap_deinit(wpa_s);
                return -1;
        }

        if (wpa_supplicant_conf_ap(wpa_s, ssid, conf)) {
                wpa_printf(MSG_ERROR, "Failed to create AP configuration");
                wpa_supplicant_ap_deinit(wpa_s);
                return -1;
        }

        hapd_iface->num_bss = conf->num_bss;
        hapd_iface->bss = os_zalloc(conf->num_bss *
                                    sizeof(struct hostapd_data *));
        if (hapd_iface->bss == NULL) {
                wpa_supplicant_ap_deinit(wpa_s);
                return -1;
        }

        for (i = 0; i < conf->num_bss; i++) {
                hapd_iface->bss[i] =
                        hostapd_alloc_bss_data(hapd_iface, conf,
                                               &conf->bss[i]);
                if (hapd_iface->bss[i] == NULL) {
                        wpa_supplicant_ap_deinit(wpa_s);
                        return -1;
                }

                hapd_iface->bss[i]->msg_ctx = wpa_s;
                hapd_iface->bss[i]->public_action_cb = ap_public_action_rx;
                hapd_iface->bss[i]->public_action_cb_ctx = wpa_s;
                hostapd_register_probereq_cb(hapd_iface->bss[i],
                                             ap_probe_req_rx, wpa_s);
                hapd_iface->bss[i]->wps_reg_success_cb = ap_wps_reg_success_cb;
                hapd_iface->bss[i]->wps_reg_success_cb_ctx = wpa_s;
        }

        os_memcpy(hapd_iface->bss[0]->own_addr, wpa_s->own_addr, ETH_ALEN);
        hapd_iface->bss[0]->driver = wpa_s->driver;
        hapd_iface->bss[0]->drv_priv = wpa_s->drv_priv;

        if (hostapd_setup_interface(wpa_s->ap_iface)) {
                wpa_printf(MSG_ERROR, "Failed to initialize AP interface");
                wpa_supplicant_ap_deinit(wpa_s);
                return -1;
        }

        wpa_s->current_ssid = ssid;
        os_memcpy(wpa_s->bssid, wpa_s->own_addr, ETH_ALEN);
        wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);

        if (wpa_s->ap_configured_cb)
                wpa_s->ap_configured_cb(wpa_s->ap_configured_cb_ctx,
                                        wpa_s->ap_configured_cb_data);

        return 0;
}


void wpa_supplicant_ap_deinit(struct wpa_supplicant *wpa_s)
{
        if (wpa_s->ap_iface == NULL)
                return;

        wpa_s->current_ssid = NULL;
        hostapd_interface_deinit(wpa_s->ap_iface);
        hostapd_interface_free(wpa_s->ap_iface);
        wpa_s->ap_iface = NULL;
        wpa_drv_deinit_ap(wpa_s);
}


void ap_tx_status(void *ctx, const u8 *addr,
                  const u8 *buf, size_t len, int ack)
{
#ifdef NEED_AP_MLME
        struct wpa_supplicant *wpa_s = ctx;
        hostapd_tx_status(wpa_s->ap_iface->bss[0], addr, buf, len, ack);
#endif /* NEED_AP_MLME */
}


void ap_rx_from_unknown_sta(void *ctx, const u8 *frame, size_t len)
{
#ifdef NEED_AP_MLME
        struct wpa_supplicant *wpa_s = ctx;
        const struct ieee80211_hdr *hdr =
                (const struct ieee80211_hdr *) frame;
        u16 fc = le_to_host16(hdr->frame_control);
        ieee802_11_rx_from_unknown(wpa_s->ap_iface->bss[0], hdr->addr2,
                                   (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
                                   (WLAN_FC_TODS | WLAN_FC_FROMDS));
#endif /* NEED_AP_MLME */
}


void ap_mgmt_rx(void *ctx, struct rx_mgmt *rx_mgmt)
{
#ifdef NEED_AP_MLME
        struct wpa_supplicant *wpa_s = ctx;
        struct hostapd_frame_info fi;
        os_memset(&fi, 0, sizeof(fi));
        fi.datarate = rx_mgmt->datarate;
        fi.ssi_signal = rx_mgmt->ssi_signal;
        ieee802_11_mgmt(wpa_s->ap_iface->bss[0], rx_mgmt->frame,
                        rx_mgmt->frame_len, &fi);
#endif /* NEED_AP_MLME */
}


void ap_mgmt_tx_cb(void *ctx, const u8 *buf, size_t len, u16 stype, int ok)
{
#ifdef NEED_AP_MLME
        struct wpa_supplicant *wpa_s = ctx;
        ieee802_11_mgmt_cb(wpa_s->ap_iface->bss[0], buf, len, stype, ok);
#endif /* NEED_AP_MLME */
}


void wpa_supplicant_ap_rx_eapol(struct wpa_supplicant *wpa_s,
                                const u8 *src_addr, const u8 *buf, size_t len)
{
        ieee802_1x_receive(wpa_s->ap_iface->bss[0], src_addr, buf, len);
}


#ifdef CONFIG_WPS

int wpa_supplicant_ap_wps_pbc(struct wpa_supplicant *wpa_s, const u8 *bssid)
{
        if (!wpa_s->ap_iface)
                return -1;
        return hostapd_wps_button_pushed(wpa_s->ap_iface->bss[0]);
}


int wpa_supplicant_ap_wps_pin(struct wpa_supplicant *wpa_s, const u8 *bssid,
                              const char *pin, char *buf, size_t buflen)
{
        int ret, ret_len = 0;

        if (!wpa_s->ap_iface)
                return -1;

        if (pin == NULL) {
                unsigned int rpin = wps_generate_pin();
                ret_len = os_snprintf(buf, buflen, "%d", rpin);
                pin = buf;
        }

        ret = hostapd_wps_add_pin(wpa_s->ap_iface->bss[0], "any", pin, 0);
        if (ret)
                return -1;
        return ret_len;
}

#endif /* CONFIG_WPS */


#ifdef CONFIG_CTRL_IFACE

int ap_ctrl_iface_sta_first(struct wpa_supplicant *wpa_s,
                            char *buf, size_t buflen)
{
        if (wpa_s->ap_iface == NULL)
                return -1;
        return hostapd_ctrl_iface_sta_first(wpa_s->ap_iface->bss[0],
                                            buf, buflen);
}


int ap_ctrl_iface_sta(struct wpa_supplicant *wpa_s, const char *txtaddr,
                      char *buf, size_t buflen)
{
        if (wpa_s->ap_iface == NULL)
                return -1;
        return hostapd_ctrl_iface_sta(wpa_s->ap_iface->bss[0], txtaddr,
                                      buf, buflen);
}


int ap_ctrl_iface_sta_next(struct wpa_supplicant *wpa_s, const char *txtaddr,
                           char *buf, size_t buflen)
{
        if (wpa_s->ap_iface == NULL)
                return -1;
        return hostapd_ctrl_iface_sta_next(wpa_s->ap_iface->bss[0], txtaddr,
                                           buf, buflen);
}


int ap_ctrl_iface_wpa_get_status(struct wpa_supplicant *wpa_s, char *buf,
                                 size_t buflen, int verbose)
{
        char *pos = buf, *end = buf + buflen;
        int ret;
        struct hostapd_bss_config *conf;

        if (wpa_s->ap_iface == NULL)
                return -1;

        conf = wpa_s->ap_iface->bss[0]->conf;
        if (conf->wpa == 0)
                return 0;

        ret = os_snprintf(pos, end - pos,
                          "pairwise_cipher=%s\n"
                          "group_cipher=%s\n"
                          "key_mgmt=%s\n",
                          wpa_cipher_txt(conf->rsn_pairwise),
                          wpa_cipher_txt(conf->wpa_group),
                          wpa_key_mgmt_txt(conf->wpa_key_mgmt,
                                           conf->wpa));
        if (ret < 0 || ret >= end - pos)
                return pos - buf;
        pos += ret;
        return pos - buf;
}

#endif /* CONFIG_CTRL_IFACE */


int wpa_supplicant_ap_mac_addr_filter(struct wpa_supplicant *wpa_s,
                                      const u8 *addr)
{
        struct hostapd_data *hapd;
        struct hostapd_bss_config *conf;

        if (!wpa_s->ap_iface)
                return -1;

        if (addr)
                wpa_printf(MSG_DEBUG, "AP: Set MAC address filter: " MACSTR,
                           MAC2STR(addr));
        else
                wpa_printf(MSG_DEBUG, "AP: Clear MAC address filter");

        hapd = wpa_s->ap_iface->bss[0];
        conf = hapd->conf;

        os_free(conf->accept_mac);
        conf->accept_mac = NULL;
        conf->num_accept_mac = 0;
        os_free(conf->deny_mac);
        conf->deny_mac = NULL;
        conf->num_deny_mac = 0;

        if (addr == NULL) {
                conf->macaddr_acl = ACCEPT_UNLESS_DENIED;
                return 0;
        }

        conf->macaddr_acl = DENY_UNLESS_ACCEPTED;
        conf->accept_mac = os_zalloc(sizeof(struct mac_acl_entry));
        if (conf->accept_mac == NULL)
                return -1;
        os_memcpy(conf->accept_mac[0].addr, addr, ETH_ALEN);
        conf->num_accept_mac = 1;

        return 0;
}