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Diffstat (limited to 'contrib/hostapd/beacon.c')
| -rw-r--r-- | contrib/hostapd/beacon.c | 419 |
1 files changed, 0 insertions, 419 deletions
diff --git a/contrib/hostapd/beacon.c b/contrib/hostapd/beacon.c deleted file mode 100644 index 7af2bc1..0000000 --- a/contrib/hostapd/beacon.c +++ /dev/null @@ -1,419 +0,0 @@ -/* - * hostapd / IEEE 802.11 Management: Beacon and Probe Request/Response - * Copyright (c) 2002-2004, Instant802 Networks, Inc. - * Copyright (c) 2005-2006, Devicescape Software, Inc. - * - * 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 "includes.h" - -#ifndef CONFIG_NATIVE_WINDOWS - -#include "hostapd.h" -#include "ieee802_11.h" -#include "wpa.h" -#include "wme.h" -#include "beacon.h" -#include "hw_features.h" -#include "driver.h" -#include "sta_info.h" -#include "ieee802_11h.h" - - -static u8 ieee802_11_erp_info(struct hostapd_data *hapd) -{ - u8 erp = 0; - - if (hapd->iface == NULL || hapd->iface->current_mode == NULL || - hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) - return 0; - - switch (hapd->iconf->cts_protection_type) { - case CTS_PROTECTION_FORCE_ENABLED: - erp |= ERP_INFO_NON_ERP_PRESENT | ERP_INFO_USE_PROTECTION; - break; - case CTS_PROTECTION_FORCE_DISABLED: - erp = 0; - break; - case CTS_PROTECTION_AUTOMATIC: - if (hapd->iface->olbc) - erp |= ERP_INFO_USE_PROTECTION; - /* continue */ - case CTS_PROTECTION_AUTOMATIC_NO_OLBC: - if (hapd->iface->num_sta_non_erp > 0) { - erp |= ERP_INFO_NON_ERP_PRESENT | - ERP_INFO_USE_PROTECTION; - } - break; - } - if (hapd->iface->num_sta_no_short_preamble > 0) - erp |= ERP_INFO_BARKER_PREAMBLE_MODE; - - return erp; -} - - -static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid) -{ - *eid++ = WLAN_EID_DS_PARAMS; - *eid++ = 1; - *eid++ = hapd->iconf->channel; - return eid; -} - - -static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid) -{ - if (hapd->iface == NULL || hapd->iface->current_mode == NULL || - hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) - return eid; - - /* Set NonERP_present and use_protection bits if there - * are any associated NonERP stations. */ - /* TODO: use_protection bit can be set to zero even if - * there are NonERP stations present. This optimization - * might be useful if NonERP stations are "quiet". - * See 802.11g/D6 E-1 for recommended practice. - * In addition, Non ERP present might be set, if AP detects Non ERP - * operation on other APs. */ - - /* Add ERP Information element */ - *eid++ = WLAN_EID_ERP_INFO; - *eid++ = 1; - *eid++ = ieee802_11_erp_info(hapd); - - return eid; -} - - -static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid, - int max_len) -{ - int left; - u8 *pos = eid; - - if ((!hapd->iconf->ieee80211d && !hapd->iface->dfs_enable) || - max_len < 6) - return eid; - - *pos++ = WLAN_EID_COUNTRY; - pos++; /* length will be set later */ - memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */ - pos += 3; - left = max_len - 3; - - if ((pos - eid) & 1) { - if (left < 1) - return eid; - *pos++ = 0; /* pad for 16-bit alignment */ - left--; - } - - eid[1] = (pos - eid) - 2; - - return pos; -} - - -static u8 * hostapd_eid_power_constraint(struct hostapd_data *hapd, u8 *eid) - -{ - if (!hapd->iface->dfs_enable) - return eid; - *eid++ = WLAN_EID_PWR_CONSTRAINT; - *eid++ = 1; - *eid++ = hapd->iface->pwr_const; - return eid; -} - - -static u8 * hostapd_eid_tpc_report(struct hostapd_data *hapd, u8 *eid) - -{ - if (!hapd->iface->dfs_enable) - return eid; - *eid++ = WLAN_EID_TPC_REPORT; - *eid++ = 2; - *eid++ = hapd->iface->tx_power; /* TX POWER */ - *eid++ = 0; /* Link Margin */ - return eid; -} - -static u8 * hostapd_eid_channel_switch(struct hostapd_data *hapd, u8 *eid) - -{ - if (!hapd->iface->dfs_enable || !hapd->iface->channel_switch) - return eid; - *eid++ = WLAN_EID_CHANNEL_SWITCH; - *eid++ = 3; - *eid++ = CHAN_SWITCH_MODE_QUIET; - *eid++ = hapd->iface->channel_switch; /* New channel */ - /* 0 - very soon; 1 - before next TBTT; num - after num beacons */ - *eid++ = 0; - return eid; -} - - -static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len, - struct sta_info *sta) -{ - const u8 *ie; - size_t ielen; - - ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen); - if (ie == NULL || ielen > len) - return eid; - - memcpy(eid, ie, ielen); - return eid + ielen; -} - - -void handle_probe_req(struct hostapd_data *hapd, struct ieee80211_mgmt *mgmt, - size_t len) -{ - struct ieee80211_mgmt *resp; - struct ieee802_11_elems elems; - char *ssid; - u8 *pos, *epos; - size_t ssid_len; - struct sta_info *sta = NULL; - - if (!hapd->iconf->send_probe_response) - return; - - if (ieee802_11_parse_elems(hapd, mgmt->u.probe_req.variable, - len - (IEEE80211_HDRLEN + - sizeof(mgmt->u.probe_req)), &elems, - 0) - == ParseFailed) { - HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, - "Could not parse ProbeReq from " MACSTR "\n", - MAC2STR(mgmt->sa)); - return; - } - - ssid = NULL; - ssid_len = 0; - - if ((!elems.ssid || !elems.supp_rates)) { - printf("STA " MACSTR " sent probe request without SSID or " - "supported rates element\n", MAC2STR(mgmt->sa)); - return; - } - - if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0) { - HOSTAPD_DEBUG(HOSTAPD_DEBUG_MSGDUMPS, - "Probe Request from " MACSTR " for broadcast " - "SSID ignored\n", MAC2STR(mgmt->sa)); - return; - } - - sta = ap_get_sta(hapd, mgmt->sa); - - if (elems.ssid_len == 0 || - (elems.ssid_len == hapd->conf->ssid.ssid_len && - memcmp(elems.ssid, hapd->conf->ssid.ssid, elems.ssid_len) == 0)) { - ssid = hapd->conf->ssid.ssid; - ssid_len = hapd->conf->ssid.ssid_len; - if (sta) - sta->ssid_probe = &hapd->conf->ssid; - } - - if (!ssid) { - if (HOSTAPD_DEBUG_COND(HOSTAPD_DEBUG_MSGDUMPS)) { - printf("Probe Request from " MACSTR " for foreign " - "SSID '", MAC2STR(mgmt->sa)); - ieee802_11_print_ssid(elems.ssid, elems.ssid_len); - printf("'\n"); - } - return; - } - - /* TODO: verify that supp_rates contains at least one matching rate - * with AP configuration */ -#define MAX_PROBERESP_LEN 512 - resp = wpa_zalloc(MAX_PROBERESP_LEN); - if (resp == NULL) - return; - epos = ((u8 *) resp) + MAX_PROBERESP_LEN; - - resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, - WLAN_FC_STYPE_PROBE_RESP); - memcpy(resp->da, mgmt->sa, ETH_ALEN); - memcpy(resp->sa, hapd->own_addr, ETH_ALEN); - - memcpy(resp->bssid, hapd->own_addr, ETH_ALEN); - resp->u.probe_resp.beacon_int = - host_to_le16(hapd->iconf->beacon_int); - - /* hardware or low-level driver will setup seq_ctrl and timestamp */ - resp->u.probe_resp.capab_info = - host_to_le16(hostapd_own_capab_info(hapd, sta, 1)); - - pos = resp->u.probe_resp.variable; - *pos++ = WLAN_EID_SSID; - *pos++ = ssid_len; - memcpy(pos, ssid, ssid_len); - pos += ssid_len; - - /* Supported rates */ - pos = hostapd_eid_supp_rates(hapd, pos); - - /* DS Params */ - pos = hostapd_eid_ds_params(hapd, pos); - - pos = hostapd_eid_country(hapd, pos, epos - pos); - - pos = hostapd_eid_power_constraint(hapd, pos); - pos = hostapd_eid_tpc_report(hapd, pos); - - /* ERP Information element */ - pos = hostapd_eid_erp_info(hapd, pos); - - /* Extended supported rates */ - pos = hostapd_eid_ext_supp_rates(hapd, pos); - - pos = hostapd_eid_wpa(hapd, pos, epos - pos, sta); - - /* Wi-Fi Wireless Multimedia Extensions */ - if (hapd->conf->wme_enabled) - pos = hostapd_eid_wme(hapd, pos); - - if (hostapd_send_mgmt_frame(hapd, resp, pos - (u8 *) resp, 0) < 0) - perror("handle_probe_req: send"); - - free(resp); - - HOSTAPD_DEBUG(HOSTAPD_DEBUG_MSGDUMPS, "STA " MACSTR - " sent probe request for %s SSID\n", - MAC2STR(mgmt->sa), elems.ssid_len == 0 ? "broadcast" : - "our"); -} - - -void ieee802_11_set_beacon(struct hostapd_data *hapd) -{ - struct ieee80211_mgmt *head; - u8 *pos, *tail, *tailpos; - int preamble; - u16 capab_info; - size_t head_len, tail_len; - int cts_protection = ((ieee802_11_erp_info(hapd) & - ERP_INFO_USE_PROTECTION) ? 1 : 0); - -#define BEACON_HEAD_BUF_SIZE 256 -#define BEACON_TAIL_BUF_SIZE 256 - head = wpa_zalloc(BEACON_HEAD_BUF_SIZE); - tailpos = tail = malloc(BEACON_TAIL_BUF_SIZE); - if (head == NULL || tail == NULL) { - printf("Failed to set beacon data\n"); - free(head); - free(tail); - return; - } - - head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, - WLAN_FC_STYPE_BEACON); - head->duration = host_to_le16(0); - memset(head->da, 0xff, ETH_ALEN); - - memcpy(head->sa, hapd->own_addr, ETH_ALEN); - memcpy(head->bssid, hapd->own_addr, ETH_ALEN); - head->u.beacon.beacon_int = - host_to_le16(hapd->iconf->beacon_int); - - /* hardware or low-level driver will setup seq_ctrl and timestamp */ - capab_info = hostapd_own_capab_info(hapd, NULL, 0); - head->u.beacon.capab_info = host_to_le16(capab_info); - pos = &head->u.beacon.variable[0]; - - /* SSID */ - *pos++ = WLAN_EID_SSID; - if (hapd->conf->ignore_broadcast_ssid == 2) { - /* clear the data, but keep the correct length of the SSID */ - *pos++ = hapd->conf->ssid.ssid_len; - memset(pos, 0, hapd->conf->ssid.ssid_len); - pos += hapd->conf->ssid.ssid_len; - } else if (hapd->conf->ignore_broadcast_ssid) { - *pos++ = 0; /* empty SSID */ - } else { - *pos++ = hapd->conf->ssid.ssid_len; - memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len); - pos += hapd->conf->ssid.ssid_len; - } - - /* Supported rates */ - pos = hostapd_eid_supp_rates(hapd, pos); - - /* DS Params */ - pos = hostapd_eid_ds_params(hapd, pos); - - head_len = pos - (u8 *) head; - - tailpos = hostapd_eid_country(hapd, tailpos, - tail + BEACON_TAIL_BUF_SIZE - tailpos); - - tailpos = hostapd_eid_power_constraint(hapd, tailpos); - tailpos = hostapd_eid_channel_switch(hapd, tailpos); - tailpos = hostapd_eid_tpc_report(hapd, tailpos); - - /* ERP Information element */ - tailpos = hostapd_eid_erp_info(hapd, tailpos); - - /* Extended supported rates */ - tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos); - - tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE - - tailpos, NULL); - - /* Wi-Fi Wireless Multimedia Extensions */ - if (hapd->conf->wme_enabled) - tailpos = hostapd_eid_wme(hapd, tailpos); - - tail_len = tailpos > tail ? tailpos - tail : 0; - - if (hostapd_set_beacon(hapd->conf->iface, hapd, (u8 *) head, head_len, - tail, tail_len)) - printf("Failed to set beacon head/tail\n"); - - free(tail); - free(head); - - if (hostapd_set_cts_protect(hapd, cts_protection)) - printf("Failed to set CTS protect in kernel driver\n"); - - if (hapd->iface && hapd->iface->current_mode && - hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G && - hostapd_set_short_slot_time(hapd, - hapd->iface->num_sta_no_short_slot_time - > 0 ? 0 : 1)) - printf("Failed to set Short Slot Time option in kernel " - "driver\n"); - - if (hapd->iface && hapd->iface->num_sta_no_short_preamble == 0 && - hapd->iconf->preamble == SHORT_PREAMBLE) - preamble = SHORT_PREAMBLE; - else - preamble = LONG_PREAMBLE; - if (hostapd_set_preamble(hapd, preamble)) - printf("Could not set preamble for kernel driver\n"); -} - - -void ieee802_11_set_beacons(struct hostapd_iface *iface) -{ - size_t i; - for (i = 0; i < iface->num_bss; i++) - ieee802_11_set_beacon(iface->bss[i]); -} - -#endif /* CONFIG_NATIVE_WINDOWS */ |
