Interworking: Add GAS server support for AP mode
This adds GAS/ANQP implementation into hostapd. This commit brings in the basic GAS/ANQP functionality, but only the ANQP Capability List element is supported. For testing purposes, hostapd control interface SET command can be used to set the gas_frag_limit parameter dynamically. Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>master
Jay Katabathuni
13 years ago
committed by
Jouni Malinen
parent
fb80e86e7d
commit
dca30c3fb7
@ -0,0 +1,621 @@
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/*
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* Generic advertisement service (GAS) server
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* Copyright (c) 2011-2012, Qualcomm Atheros, Inc.
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include "includes.h"
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#include "common.h"
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#include "common/ieee802_11_defs.h"
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#include "common/gas.h"
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#include "utils/eloop.h"
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#include "hostapd.h"
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#include "ap_config.h"
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#include "ap_drv_ops.h"
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#include "sta_info.h"
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#include "gas_serv.h"
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static struct gas_dialog_info *
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gas_dialog_create(struct hostapd_data *hapd, const u8 *addr, u8 dialog_token)
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{
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struct sta_info *sta;
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struct gas_dialog_info *dia = NULL;
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int i, j;
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sta = ap_get_sta(hapd, addr);
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if (!sta) {
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/*
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* We need a STA entry to be able to maintain state for
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* the GAS query.
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*/
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wpa_printf(MSG_DEBUG, "ANQP: Add a temporary STA entry for "
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"GAS query");
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sta = ap_sta_add(hapd, addr);
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if (!sta) {
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wpa_printf(MSG_DEBUG, "Failed to add STA " MACSTR
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" for GAS query", MAC2STR(addr));
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return NULL;
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}
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sta->flags |= WLAN_STA_GAS;
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/*
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* The default inactivity is 300 seconds. We don't need
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* it to be that long.
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*/
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ap_sta_session_timeout(hapd, sta, 5);
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}
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if (sta->gas_dialog == NULL) {
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sta->gas_dialog = os_zalloc(GAS_DIALOG_MAX *
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sizeof(struct gas_dialog_info));
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if (sta->gas_dialog == NULL)
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return NULL;
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}
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for (i = sta->gas_dialog_next, j = 0; j < GAS_DIALOG_MAX; i++, j++) {
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if (i == GAS_DIALOG_MAX)
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i = 0;
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if (sta->gas_dialog[i].valid)
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continue;
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dia = &sta->gas_dialog[i];
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dia->valid = 1;
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dia->index = i;
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dia->dialog_token = dialog_token;
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sta->gas_dialog_next = (++i == GAS_DIALOG_MAX) ? 0 : i;
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return dia;
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}
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wpa_msg(hapd->msg_ctx, MSG_ERROR, "ANQP: Could not create dialog for "
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MACSTR " dialog_token %u. Consider increasing "
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"GAS_DIALOG_MAX.", MAC2STR(addr), dialog_token);
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return NULL;
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}
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struct gas_dialog_info *
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gas_serv_dialog_find(struct hostapd_data *hapd, const u8 *addr,
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u8 dialog_token)
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{
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struct sta_info *sta;
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int i;
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sta = ap_get_sta(hapd, addr);
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if (!sta) {
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wpa_printf(MSG_DEBUG, "ANQP: could not find STA " MACSTR,
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MAC2STR(addr));
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return NULL;
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}
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for (i = 0; sta->gas_dialog && i < GAS_DIALOG_MAX; i++) {
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if (sta->gas_dialog[i].dialog_token != dialog_token ||
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!sta->gas_dialog[i].valid)
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continue;
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return &sta->gas_dialog[i];
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}
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wpa_printf(MSG_DEBUG, "ANQP: Could not find dialog for "
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MACSTR " dialog_token %u", MAC2STR(addr), dialog_token);
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return NULL;
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}
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void gas_serv_dialog_clear(struct gas_dialog_info *dia)
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{
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wpabuf_free(dia->sd_resp);
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os_memset(dia, 0, sizeof(*dia));
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}
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static void gas_serv_free_dialogs(struct hostapd_data *hapd,
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const u8 *sta_addr)
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{
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struct sta_info *sta;
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int i;
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sta = ap_get_sta(hapd, sta_addr);
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if (sta == NULL || sta->gas_dialog == NULL)
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return;
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for (i = 0; i < GAS_DIALOG_MAX; i++) {
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if (sta->gas_dialog[i].valid)
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return;
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}
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os_free(sta->gas_dialog);
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sta->gas_dialog = NULL;
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}
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static void anqp_add_capab_list(struct hostapd_data *hapd,
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struct wpabuf *buf)
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{
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u8 *len;
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len = gas_anqp_add_element(buf, ANQP_CAPABILITY_LIST);
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wpabuf_put_le16(buf, ANQP_CAPABILITY_LIST);
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gas_anqp_set_element_len(buf, len);
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}
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static struct wpabuf *
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gas_serv_build_gas_resp_payload(struct hostapd_data *hapd,
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unsigned int request,
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struct gas_dialog_info *di)
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{
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struct wpabuf *buf;
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buf = wpabuf_alloc(1400);
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if (buf == NULL)
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return NULL;
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if (request & ANQP_REQ_CAPABILITY_LIST)
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anqp_add_capab_list(hapd, buf);
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return buf;
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}
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static void gas_serv_clear_cached_ies(void *eloop_data, void *user_ctx)
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{
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struct gas_dialog_info *dia = eloop_data;
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wpa_printf(MSG_DEBUG, "GAS: Timeout triggered, clearing dialog for "
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"dialog token %d", dia->dialog_token);
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gas_serv_dialog_clear(dia);
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}
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struct anqp_query_info {
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unsigned int request;
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unsigned int remote_request;
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const void *param;
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u32 param_arg;
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u16 remote_delay;
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};
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static void set_anqp_req(unsigned int bit, const char *name, int local,
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unsigned int remote, u16 remote_delay,
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struct anqp_query_info *qi)
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{
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qi->request |= bit;
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if (local) {
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wpa_printf(MSG_DEBUG, "ANQP: %s (local)", name);
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} else if (bit & remote) {
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wpa_printf(MSG_DEBUG, "ANQP: %s (remote)", name);
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qi->remote_request |= bit;
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if (remote_delay > qi->remote_delay)
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qi->remote_delay = remote_delay;
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} else {
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wpa_printf(MSG_DEBUG, "ANQP: %s not available", name);
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}
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}
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static void rx_anqp_query_list_id(struct hostapd_data *hapd, u16 info_id,
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struct anqp_query_info *qi)
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{
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switch (info_id) {
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case ANQP_CAPABILITY_LIST:
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set_anqp_req(ANQP_REQ_CAPABILITY_LIST, "Capability List", 1, 0,
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0, qi);
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break;
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default:
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wpa_printf(MSG_DEBUG, "ANQP: Unsupported Info Id %u",
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info_id);
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break;
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}
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}
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static void rx_anqp_query_list(struct hostapd_data *hapd,
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const u8 *pos, const u8 *end,
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struct anqp_query_info *qi)
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{
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wpa_printf(MSG_DEBUG, "ANQP: %u Info IDs requested in Query list",
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(unsigned int) (end - pos) / 2);
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while (pos + 2 <= end) {
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rx_anqp_query_list_id(hapd, WPA_GET_LE16(pos), qi);
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pos += 2;
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}
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}
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static void gas_serv_req_local_processing(struct hostapd_data *hapd,
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const u8 *sa, u8 dialog_token,
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struct anqp_query_info *qi)
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{
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struct wpabuf *buf, *tx_buf;
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buf = gas_serv_build_gas_resp_payload(hapd, qi->request, NULL);
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wpa_hexdump_buf(MSG_MSGDUMP, "ANQP: Locally generated ANQP responses",
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buf);
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if (!buf)
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return;
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if (wpabuf_len(buf) > hapd->gas_frag_limit ||
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hapd->conf->gas_comeback_delay) {
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struct gas_dialog_info *di;
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u16 comeback_delay = 1;
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if (hapd->conf->gas_comeback_delay) {
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/* Testing - allow overriding of the delay value */
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comeback_delay = hapd->conf->gas_comeback_delay;
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}
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wpa_printf(MSG_DEBUG, "ANQP: Too long response to fit in "
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"initial response - use GAS comeback");
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di = gas_dialog_create(hapd, sa, dialog_token);
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if (!di) {
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wpa_printf(MSG_INFO, "ANQP: Could not create dialog "
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"for " MACSTR " (dialog token %u)",
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MAC2STR(sa), dialog_token);
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wpabuf_free(buf);
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return;
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}
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di->sd_resp = buf;
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di->sd_resp_pos = 0;
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tx_buf = gas_anqp_build_initial_resp_buf(
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dialog_token, WLAN_STATUS_SUCCESS, comeback_delay,
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NULL);
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} else {
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wpa_printf(MSG_DEBUG, "ANQP: Initial response (no comeback)");
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tx_buf = gas_anqp_build_initial_resp_buf(
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dialog_token, WLAN_STATUS_SUCCESS, 0, buf);
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wpabuf_free(buf);
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}
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if (!tx_buf)
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return;
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hostapd_drv_send_action(hapd, hapd->iface->freq, 0, sa,
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wpabuf_head(tx_buf), wpabuf_len(tx_buf));
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wpabuf_free(tx_buf);
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}
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static void gas_serv_rx_gas_initial_req(struct hostapd_data *hapd,
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const u8 *sa,
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const u8 *data, size_t len)
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{
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const u8 *pos = data;
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const u8 *end = data + len;
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const u8 *next;
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u8 dialog_token;
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u16 slen;
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struct anqp_query_info qi;
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const u8 *adv_proto;
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if (len < 1 + 2)
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return;
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os_memset(&qi, 0, sizeof(qi));
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dialog_token = *pos++;
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wpa_msg(hapd->msg_ctx, MSG_DEBUG,
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"GAS: GAS Initial Request from " MACSTR " (dialog token %u) ",
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MAC2STR(sa), dialog_token);
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if (*pos != WLAN_EID_ADV_PROTO) {
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wpa_msg(hapd->msg_ctx, MSG_DEBUG,
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"GAS: Unexpected IE in GAS Initial Request: %u", *pos);
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return;
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}
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adv_proto = pos++;
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slen = *pos++;
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next = pos + slen;
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if (next > end || slen < 2) {
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wpa_msg(hapd->msg_ctx, MSG_DEBUG,
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"GAS: Invalid IE in GAS Initial Request");
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return;
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}
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pos++; /* skip QueryRespLenLimit and PAME-BI */
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if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) {
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struct wpabuf *buf;
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wpa_msg(hapd->msg_ctx, MSG_DEBUG,
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"GAS: Unsupported GAS advertisement protocol id %u",
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*pos);
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if (sa[0] & 0x01)
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return; /* Invalid source address - drop silently */
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buf = gas_build_initial_resp(
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dialog_token, WLAN_STATUS_GAS_ADV_PROTO_NOT_SUPPORTED,
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0, 2 + slen + 2);
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if (buf == NULL)
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return;
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wpabuf_put_data(buf, adv_proto, 2 + slen);
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wpabuf_put_le16(buf, 0); /* Query Response Length */
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hostapd_drv_send_action(hapd, hapd->iface->freq, 0, sa,
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wpabuf_head(buf), wpabuf_len(buf));
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wpabuf_free(buf);
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return;
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}
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pos = next;
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/* Query Request */
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if (pos + 2 > end)
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return;
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slen = WPA_GET_LE16(pos);
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pos += 2;
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if (pos + slen > end)
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return;
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end = pos + slen;
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/* ANQP Query Request */
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while (pos < end) {
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u16 info_id, elen;
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if (pos + 4 > end)
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return;
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info_id = WPA_GET_LE16(pos);
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pos += 2;
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elen = WPA_GET_LE16(pos);
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pos += 2;
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if (pos + elen > end) {
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wpa_printf(MSG_DEBUG, "ANQP: Invalid Query Request");
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return;
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}
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switch (info_id) {
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case ANQP_QUERY_LIST:
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rx_anqp_query_list(hapd, pos, pos + elen, &qi);
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break;
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default:
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wpa_printf(MSG_DEBUG, "ANQP: Unsupported Query "
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"Request element %u", info_id);
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break;
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}
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pos += elen;
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}
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gas_serv_req_local_processing(hapd, sa, dialog_token, &qi);
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}
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void gas_serv_tx_gas_response(struct hostapd_data *hapd, const u8 *dst,
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struct gas_dialog_info *dialog)
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{
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struct wpabuf *buf, *tx_buf;
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u8 dialog_token = dialog->dialog_token;
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size_t frag_len;
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if (dialog->sd_resp == NULL) {
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buf = gas_serv_build_gas_resp_payload(hapd,
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dialog->all_requested,
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dialog);
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wpa_hexdump_buf(MSG_MSGDUMP, "ANQP: Generated ANQP responses",
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buf);
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if (!buf)
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goto tx_gas_response_done;
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dialog->sd_resp = buf;
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dialog->sd_resp_pos = 0;
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}
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frag_len = wpabuf_len(dialog->sd_resp) - dialog->sd_resp_pos;
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if (frag_len > hapd->gas_frag_limit || dialog->comeback_delay ||
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hapd->conf->gas_comeback_delay) {
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u16 comeback_delay_tus = dialog->comeback_delay +
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GAS_SERV_COMEBACK_DELAY_FUDGE;
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u32 comeback_delay_secs, comeback_delay_usecs;
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if (hapd->conf->gas_comeback_delay) {
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/* Testing - allow overriding of the delay value */
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comeback_delay_tus = hapd->conf->gas_comeback_delay;
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}
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wpa_printf(MSG_DEBUG, "GAS: Response frag_len %u (frag limit "
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"%u) and comeback delay %u, "
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"requesting comebacks", (unsigned int) frag_len,
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(unsigned int) hapd->gas_frag_limit,
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dialog->comeback_delay);
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tx_buf = gas_anqp_build_initial_resp_buf(dialog_token,
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WLAN_STATUS_SUCCESS,
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comeback_delay_tus,
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NULL);
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if (tx_buf) {
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wpa_msg(hapd->msg_ctx, MSG_DEBUG,
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"GAS: Tx GAS Initial Resp (comeback = 10TU)");
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hostapd_drv_send_action(hapd, hapd->iface->freq, 0,
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dst,
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wpabuf_head(tx_buf),
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wpabuf_len(tx_buf));
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}
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wpabuf_free(tx_buf);
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/* start a timer of 1.5 * comeback-delay */
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comeback_delay_tus = comeback_delay_tus +
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(comeback_delay_tus / 2);
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comeback_delay_secs = (comeback_delay_tus * 1024) / 1000000;
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comeback_delay_usecs = (comeback_delay_tus * 1024) -
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(comeback_delay_secs * 1000000);
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eloop_register_timeout(comeback_delay_secs,
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comeback_delay_usecs,
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gas_serv_clear_cached_ies, dialog,
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NULL);
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goto tx_gas_response_done;
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}
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buf = wpabuf_alloc_copy(wpabuf_head_u8(dialog->sd_resp) +
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dialog->sd_resp_pos, frag_len);
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if (buf == NULL) {
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wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: Buffer allocation "
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"failed");
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goto tx_gas_response_done;
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}
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tx_buf = gas_anqp_build_initial_resp_buf(dialog_token,
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WLAN_STATUS_SUCCESS, 0, buf);
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wpabuf_free(buf);
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if (tx_buf == NULL)
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goto tx_gas_response_done;
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wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: Tx GAS Initial "
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"Response (frag_id %d frag_len %d)",
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dialog->sd_frag_id, (int) frag_len);
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dialog->sd_frag_id++;
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hostapd_drv_send_action(hapd, hapd->iface->freq, 0, dst,
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wpabuf_head(tx_buf), wpabuf_len(tx_buf));
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wpabuf_free(tx_buf);
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tx_gas_response_done:
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gas_serv_clear_cached_ies(dialog, NULL);
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}
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|
||||
static void gas_serv_rx_gas_comeback_req(struct hostapd_data *hapd,
|
||||
const u8 *sa,
|
||||
const u8 *data, size_t len)
|
||||
{
|
||||
struct gas_dialog_info *dialog;
|
||||
struct wpabuf *buf, *tx_buf;
|
||||
u8 dialog_token;
|
||||
size_t frag_len;
|
||||
int more = 0;
|
||||
|
||||
wpa_hexdump(MSG_DEBUG, "GAS: RX GAS Comeback Request", data, len);
|
||||
if (len < 1)
|
||||
return;
|
||||
dialog_token = *data;
|
||||
wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: Dialog Token: %u",
|
||||
dialog_token);
|
||||
|
||||
dialog = gas_serv_dialog_find(hapd, sa, dialog_token);
|
||||
if (!dialog) {
|
||||
wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: No pending SD "
|
||||
"response fragment for " MACSTR " dialog token %u",
|
||||
MAC2STR(sa), dialog_token);
|
||||
|
||||
if (sa[0] & 0x01)
|
||||
return; /* Invalid source address - drop silently */
|
||||
tx_buf = gas_anqp_build_comeback_resp_buf(
|
||||
dialog_token, WLAN_STATUS_NO_OUTSTANDING_GAS_REQ, 0, 0,
|
||||
0, NULL);
|
||||
if (tx_buf == NULL)
|
||||
return;
|
||||
goto send_resp;
|
||||
}
|
||||
|
||||
if (dialog->sd_resp == NULL) {
|
||||
wpa_printf(MSG_DEBUG, "GAS: Remote request 0x%x received 0x%x",
|
||||
dialog->requested, dialog->received);
|
||||
if ((dialog->requested & dialog->received) !=
|
||||
dialog->requested) {
|
||||
wpa_printf(MSG_DEBUG, "GAS: Did not receive response "
|
||||
"from remote processing");
|
||||
gas_serv_dialog_clear(dialog);
|
||||
tx_buf = gas_anqp_build_comeback_resp_buf(
|
||||
dialog_token,
|
||||
WLAN_STATUS_GAS_RESP_NOT_RECEIVED, 0, 0, 0,
|
||||
NULL);
|
||||
if (tx_buf == NULL)
|
||||
return;
|
||||
goto send_resp;
|
||||
}
|
||||
|
||||
buf = gas_serv_build_gas_resp_payload(hapd,
|
||||
dialog->all_requested,
|
||||
dialog);
|
||||
wpa_hexdump_buf(MSG_MSGDUMP, "ANQP: Generated ANQP responses",
|
||||
buf);
|
||||
if (!buf)
|
||||
goto rx_gas_comeback_req_done;
|
||||
dialog->sd_resp = buf;
|
||||
dialog->sd_resp_pos = 0;
|
||||
}
|
||||
frag_len = wpabuf_len(dialog->sd_resp) - dialog->sd_resp_pos;
|
||||
if (frag_len > hapd->gas_frag_limit) {
|
||||
frag_len = hapd->gas_frag_limit;
|
||||
more = 1;
|
||||
}
|
||||
wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: resp frag_len %u",
|
||||
(unsigned int) frag_len);
|
||||
buf = wpabuf_alloc_copy(wpabuf_head_u8(dialog->sd_resp) +
|
||||
dialog->sd_resp_pos, frag_len);
|
||||
if (buf == NULL) {
|
||||
wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: Failed to allocate "
|
||||
"buffer");
|
||||
goto rx_gas_comeback_req_done;
|
||||
}
|
||||
tx_buf = gas_anqp_build_comeback_resp_buf(dialog_token,
|
||||
WLAN_STATUS_SUCCESS,
|
||||
dialog->sd_frag_id,
|
||||
more, 0, buf);
|
||||
wpabuf_free(buf);
|
||||
if (tx_buf == NULL)
|
||||
goto rx_gas_comeback_req_done;
|
||||
wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: Tx GAS Comeback Response "
|
||||
"(frag_id %d more=%d frag_len=%d)",
|
||||
dialog->sd_frag_id, more, (int) frag_len);
|
||||
dialog->sd_frag_id++;
|
||||
dialog->sd_resp_pos += frag_len;
|
||||
|
||||
if (more) {
|
||||
wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: %d more bytes remain "
|
||||
"to be sent",
|
||||
(int) (wpabuf_len(dialog->sd_resp) -
|
||||
dialog->sd_resp_pos));
|
||||
} else {
|
||||
wpa_msg(hapd->msg_ctx, MSG_DEBUG, "GAS: All fragments of "
|
||||
"SD response sent");
|
||||
gas_serv_dialog_clear(dialog);
|
||||
gas_serv_free_dialogs(hapd, sa);
|
||||
}
|
||||
|
||||
send_resp:
|
||||
hostapd_drv_send_action(hapd, hapd->iface->freq, 0, sa,
|
||||
wpabuf_head(tx_buf), wpabuf_len(tx_buf));
|
||||
wpabuf_free(tx_buf);
|
||||
return;
|
||||
|
||||
rx_gas_comeback_req_done:
|
||||
gas_serv_clear_cached_ies(dialog, NULL);
|
||||
}
|
||||
|
||||
|
||||
static void gas_serv_rx_public_action(void *ctx, const u8 *buf, size_t len,
|
||||
int freq)
|
||||
{
|
||||
struct hostapd_data *hapd = ctx;
|
||||
const struct ieee80211_mgmt *mgmt;
|
||||
size_t hdr_len;
|
||||
const u8 *sa, *bssid, *data;
|
||||
|
||||
mgmt = (const struct ieee80211_mgmt *) buf;
|
||||
hdr_len = (const u8 *) &mgmt->u.action.u.vs_public_action.action - buf;
|
||||
if (hdr_len > len)
|
||||
return;
|
||||
if (mgmt->u.action.category != WLAN_ACTION_PUBLIC)
|
||||
return;
|
||||
sa = mgmt->sa;
|
||||
bssid = mgmt->bssid;
|
||||
len -= hdr_len;
|
||||
data = &mgmt->u.action.u.public_action.action;
|
||||
switch (data[0]) {
|
||||
case WLAN_PA_GAS_INITIAL_REQ:
|
||||
gas_serv_rx_gas_initial_req(hapd, sa, data + 1, len - 1);
|
||||
break;
|
||||
case WLAN_PA_GAS_COMEBACK_REQ:
|
||||
gas_serv_rx_gas_comeback_req(hapd, sa, data + 1, len - 1);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
int gas_serv_init(struct hostapd_data *hapd)
|
||||
{
|
||||
hapd->public_action_cb = gas_serv_rx_public_action;
|
||||
hapd->public_action_cb_ctx = hapd;
|
||||
hapd->gas_frag_limit = 1400;
|
||||
if (hapd->conf->gas_frag_limit > 0)
|
||||
hapd->gas_frag_limit = hapd->conf->gas_frag_limit;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
void gas_serv_deinit(struct hostapd_data *hapd)
|
||||
{
|
||||
}
|
||||
@ -0,0 +1,45 @@
|
||||
/*
|
||||
* Generic advertisement service (GAS) server
|
||||
* Copyright (c) 2011-2012, Qualcomm Atheros, Inc.
|
||||
*
|
||||
* This software may be distributed under the terms of the BSD license.
|
||||
* See README for more details.
|
||||
*/
|
||||
|
||||
#ifndef GAS_SERV_H
|
||||
#define GAS_SERV_H
|
||||
|
||||
#define ANQP_REQ_CAPABILITY_LIST \
|
||||
(1 << (ANQP_CAPABILITY_LIST - ANQP_QUERY_LIST))
|
||||
|
||||
/* To account for latencies between hostapd and external ANQP processor */
|
||||
#define GAS_SERV_COMEBACK_DELAY_FUDGE 10
|
||||
#define GAS_SERV_MIN_COMEBACK_DELAY 100 /* in TU */
|
||||
|
||||
struct gas_dialog_info {
|
||||
u8 valid;
|
||||
u8 index;
|
||||
struct wpabuf *sd_resp; /* Fragmented response */
|
||||
u8 dialog_token;
|
||||
size_t sd_resp_pos; /* Offset in sd_resp */
|
||||
u8 sd_frag_id;
|
||||
u16 comeback_delay;
|
||||
|
||||
unsigned int requested;
|
||||
unsigned int received;
|
||||
unsigned int all_requested;
|
||||
};
|
||||
|
||||
struct hostapd_data;
|
||||
|
||||
void gas_serv_tx_gas_response(struct hostapd_data *hapd, const u8 *dst,
|
||||
struct gas_dialog_info *dialog);
|
||||
struct gas_dialog_info *
|
||||
gas_serv_dialog_find(struct hostapd_data *hapd, const u8 *addr,
|
||||
u8 dialog_token);
|
||||
void gas_serv_dialog_clear(struct gas_dialog_info *dialog);
|
||||
|
||||
int gas_serv_init(struct hostapd_data *hapd);
|
||||
void gas_serv_deinit(struct hostapd_data *hapd);
|
||||
|
||||
#endif /* GAS_SERV_H */
|
||||
Loading…
Reference in New Issue