2017-06-15 21:16:45 +02:00
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/*
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* Generic advertisement service (GAS) query (hostapd)
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* Copyright (c) 2009, Atheros Communications
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* Copyright (c) 2011-2017, Qualcomm Atheros, Inc.
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* Copyright (c) 2011-2014, Jouni Malinen <j@w1.fi>
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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 "utils/eloop.h"
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#include "utils/list.h"
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#include "common/ieee802_11_defs.h"
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#include "common/gas.h"
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#include "common/wpa_ctrl.h"
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#include "hostapd.h"
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#include "sta_info.h"
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#include "ap_drv_ops.h"
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#include "gas_query_ap.h"
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/** GAS query timeout in seconds */
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#define GAS_QUERY_TIMEOUT_PERIOD 2
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/* GAS query wait-time / duration in ms */
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#define GAS_QUERY_WAIT_TIME_INITIAL 1000
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#define GAS_QUERY_WAIT_TIME_COMEBACK 150
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2022-05-08 11:02:40 +02:00
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#define GAS_QUERY_MAX_COMEBACK_DELAY 60000
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2017-06-15 21:16:45 +02:00
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/**
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* struct gas_query_pending - Pending GAS query
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*/
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struct gas_query_pending {
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struct dl_list list;
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struct gas_query_ap *gas;
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u8 addr[ETH_ALEN];
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u8 dialog_token;
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u8 next_frag_id;
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unsigned int wait_comeback:1;
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unsigned int offchannel_tx_started:1;
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unsigned int retry:1;
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int freq;
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u16 status_code;
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struct wpabuf *req;
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struct wpabuf *adv_proto;
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struct wpabuf *resp;
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struct os_reltime last_oper;
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void (*cb)(void *ctx, const u8 *dst, u8 dialog_token,
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enum gas_query_ap_result result,
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const struct wpabuf *adv_proto,
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const struct wpabuf *resp, u16 status_code);
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void *ctx;
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u8 sa[ETH_ALEN];
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};
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/**
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* struct gas_query_ap - Internal GAS query data
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*/
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struct gas_query_ap {
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struct hostapd_data *hapd;
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void *msg_ctx;
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struct dl_list pending; /* struct gas_query_pending */
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struct gas_query_pending *current;
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};
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static void gas_query_tx_comeback_timeout(void *eloop_data, void *user_ctx);
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static void gas_query_timeout(void *eloop_data, void *user_ctx);
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static void gas_query_rx_comeback_timeout(void *eloop_data, void *user_ctx);
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static void gas_query_tx_initial_req(struct gas_query_ap *gas,
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struct gas_query_pending *query);
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static int gas_query_new_dialog_token(struct gas_query_ap *gas, const u8 *dst);
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static int ms_from_time(struct os_reltime *last)
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{
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struct os_reltime now, res;
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os_get_reltime(&now);
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os_reltime_sub(&now, last, &res);
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return res.sec * 1000 + res.usec / 1000;
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}
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/**
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* gas_query_ap_init - Initialize GAS query component
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* @hapd: Pointer to hostapd data
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* Returns: Pointer to GAS query data or %NULL on failure
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*/
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struct gas_query_ap * gas_query_ap_init(struct hostapd_data *hapd,
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void *msg_ctx)
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{
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struct gas_query_ap *gas;
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gas = os_zalloc(sizeof(*gas));
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if (!gas)
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return NULL;
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gas->hapd = hapd;
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gas->msg_ctx = msg_ctx;
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dl_list_init(&gas->pending);
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return gas;
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}
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static const char * gas_result_txt(enum gas_query_ap_result result)
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{
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switch (result) {
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case GAS_QUERY_AP_SUCCESS:
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return "SUCCESS";
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case GAS_QUERY_AP_FAILURE:
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return "FAILURE";
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case GAS_QUERY_AP_TIMEOUT:
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return "TIMEOUT";
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case GAS_QUERY_AP_PEER_ERROR:
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return "PEER_ERROR";
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case GAS_QUERY_AP_INTERNAL_ERROR:
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return "INTERNAL_ERROR";
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case GAS_QUERY_AP_DELETED_AT_DEINIT:
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return "DELETED_AT_DEINIT";
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}
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return "N/A";
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}
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static void gas_query_free(struct gas_query_pending *query, int del_list)
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{
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if (del_list)
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dl_list_del(&query->list);
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wpabuf_free(query->req);
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wpabuf_free(query->adv_proto);
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wpabuf_free(query->resp);
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os_free(query);
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}
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static void gas_query_done(struct gas_query_ap *gas,
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struct gas_query_pending *query,
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enum gas_query_ap_result result)
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{
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wpa_msg(gas->msg_ctx, MSG_INFO, GAS_QUERY_DONE "addr=" MACSTR
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" dialog_token=%u freq=%d status_code=%u result=%s",
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MAC2STR(query->addr), query->dialog_token, query->freq,
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query->status_code, gas_result_txt(result));
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if (gas->current == query)
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gas->current = NULL;
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eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query);
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eloop_cancel_timeout(gas_query_timeout, gas, query);
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eloop_cancel_timeout(gas_query_rx_comeback_timeout, gas, query);
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dl_list_del(&query->list);
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query->cb(query->ctx, query->addr, query->dialog_token, result,
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query->adv_proto, query->resp, query->status_code);
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gas_query_free(query, 0);
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}
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/**
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* gas_query_ap_deinit - Deinitialize GAS query component
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* @gas: GAS query data from gas_query_init()
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*/
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void gas_query_ap_deinit(struct gas_query_ap *gas)
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{
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struct gas_query_pending *query, *next;
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if (gas == NULL)
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return;
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dl_list_for_each_safe(query, next, &gas->pending,
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struct gas_query_pending, list)
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gas_query_done(gas, query, GAS_QUERY_AP_DELETED_AT_DEINIT);
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os_free(gas);
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}
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static struct gas_query_pending *
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gas_query_get_pending(struct gas_query_ap *gas, const u8 *addr, u8 dialog_token)
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{
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struct gas_query_pending *q;
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dl_list_for_each(q, &gas->pending, struct gas_query_pending, list) {
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if (os_memcmp(q->addr, addr, ETH_ALEN) == 0 &&
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q->dialog_token == dialog_token)
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return q;
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}
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return NULL;
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}
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static int gas_query_append(struct gas_query_pending *query, const u8 *data,
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size_t len)
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{
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if (wpabuf_resize(&query->resp, len) < 0) {
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wpa_printf(MSG_DEBUG, "GAS: No memory to store the response");
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return -1;
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}
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wpabuf_put_data(query->resp, data, len);
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return 0;
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}
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void gas_query_ap_tx_status(struct gas_query_ap *gas, const u8 *dst,
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const u8 *data, size_t data_len, int ok)
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{
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struct gas_query_pending *query;
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int dur;
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if (!gas || !gas->current) {
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wpa_printf(MSG_DEBUG, "GAS: Unexpected TX status: dst=" MACSTR
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" ok=%d - no query in progress", MAC2STR(dst), ok);
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return;
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}
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query = gas->current;
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dur = ms_from_time(&query->last_oper);
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wpa_printf(MSG_DEBUG, "GAS: TX status: dst=" MACSTR
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" ok=%d query=%p dialog_token=%u dur=%d ms",
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MAC2STR(dst), ok, query, query->dialog_token, dur);
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if (os_memcmp(dst, query->addr, ETH_ALEN) != 0) {
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wpa_printf(MSG_DEBUG, "GAS: TX status for unexpected destination");
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return;
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}
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os_get_reltime(&query->last_oper);
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eloop_cancel_timeout(gas_query_timeout, gas, query);
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if (!ok) {
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wpa_printf(MSG_DEBUG, "GAS: No ACK to GAS request");
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eloop_register_timeout(0, 250000, gas_query_timeout,
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gas, query);
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} else {
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eloop_register_timeout(GAS_QUERY_TIMEOUT_PERIOD, 0,
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gas_query_timeout, gas, query);
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}
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if (query->wait_comeback && !query->retry) {
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eloop_cancel_timeout(gas_query_rx_comeback_timeout,
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gas, query);
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eloop_register_timeout(
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0, (GAS_QUERY_WAIT_TIME_COMEBACK + 10) * 1000,
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gas_query_rx_comeback_timeout, gas, query);
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}
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}
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static int pmf_in_use(struct hostapd_data *hapd, const u8 *addr)
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{
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struct sta_info *sta;
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sta = ap_get_sta(hapd, addr);
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return sta && (sta->flags & WLAN_STA_MFP);
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}
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static int gas_query_tx(struct gas_query_ap *gas,
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struct gas_query_pending *query,
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struct wpabuf *req, unsigned int wait_time)
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{
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int res, prot = pmf_in_use(gas->hapd, query->addr);
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wpa_printf(MSG_DEBUG, "GAS: Send action frame to " MACSTR " len=%u "
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"freq=%d prot=%d using src addr " MACSTR,
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MAC2STR(query->addr), (unsigned int) wpabuf_len(req),
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query->freq, prot, MAC2STR(query->sa));
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if (prot) {
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u8 *categ = wpabuf_mhead_u8(req);
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*categ = WLAN_ACTION_PROTECTED_DUAL;
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}
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os_get_reltime(&query->last_oper);
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res = hostapd_drv_send_action(gas->hapd, query->freq, wait_time,
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query->addr, wpabuf_head(req),
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wpabuf_len(req));
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return res;
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}
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static void gas_query_tx_comeback_req(struct gas_query_ap *gas,
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struct gas_query_pending *query)
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{
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struct wpabuf *req;
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unsigned int wait_time;
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req = gas_build_comeback_req(query->dialog_token);
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if (req == NULL) {
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gas_query_done(gas, query, GAS_QUERY_AP_INTERNAL_ERROR);
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return;
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}
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wait_time = (query->retry || !query->offchannel_tx_started) ?
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GAS_QUERY_WAIT_TIME_INITIAL : GAS_QUERY_WAIT_TIME_COMEBACK;
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if (gas_query_tx(gas, query, req, wait_time) < 0) {
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wpa_printf(MSG_DEBUG, "GAS: Failed to send Action frame to "
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MACSTR, MAC2STR(query->addr));
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gas_query_done(gas, query, GAS_QUERY_AP_INTERNAL_ERROR);
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}
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wpabuf_free(req);
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}
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static void gas_query_rx_comeback_timeout(void *eloop_data, void *user_ctx)
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{
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struct gas_query_ap *gas = eloop_data;
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struct gas_query_pending *query = user_ctx;
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int dialog_token;
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wpa_printf(MSG_DEBUG,
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"GAS: No response to comeback request received (retry=%u)",
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query->retry);
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if (gas->current != query || query->retry)
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return;
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dialog_token = gas_query_new_dialog_token(gas, query->addr);
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if (dialog_token < 0)
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return;
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wpa_printf(MSG_DEBUG,
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"GAS: Retry GAS query due to comeback response timeout");
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query->retry = 1;
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query->dialog_token = dialog_token;
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*(wpabuf_mhead_u8(query->req) + 2) = dialog_token;
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query->wait_comeback = 0;
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query->next_frag_id = 0;
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wpabuf_free(query->adv_proto);
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query->adv_proto = NULL;
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eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query);
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eloop_cancel_timeout(gas_query_timeout, gas, query);
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gas_query_tx_initial_req(gas, query);
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}
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static void gas_query_tx_comeback_timeout(void *eloop_data, void *user_ctx)
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{
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struct gas_query_ap *gas = eloop_data;
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struct gas_query_pending *query = user_ctx;
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wpa_printf(MSG_DEBUG, "GAS: Comeback timeout for request to " MACSTR,
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MAC2STR(query->addr));
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gas_query_tx_comeback_req(gas, query);
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}
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static void gas_query_tx_comeback_req_delay(struct gas_query_ap *gas,
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struct gas_query_pending *query,
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u16 comeback_delay)
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{
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unsigned int secs, usecs;
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secs = (comeback_delay * 1024) / 1000000;
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usecs = comeback_delay * 1024 - secs * 1000000;
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wpa_printf(MSG_DEBUG, "GAS: Send comeback request to " MACSTR
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" in %u secs %u usecs", MAC2STR(query->addr), secs, usecs);
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eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query);
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eloop_register_timeout(secs, usecs, gas_query_tx_comeback_timeout,
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gas, query);
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}
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|
|
|
|
|
|
|
|
static void gas_query_rx_initial(struct gas_query_ap *gas,
|
|
|
|
struct gas_query_pending *query,
|
|
|
|
const u8 *adv_proto, const u8 *resp,
|
|
|
|
size_t len, u16 comeback_delay)
|
|
|
|
{
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Received initial response from "
|
|
|
|
MACSTR " (dialog_token=%u comeback_delay=%u)",
|
|
|
|
MAC2STR(query->addr), query->dialog_token, comeback_delay);
|
|
|
|
|
|
|
|
query->adv_proto = wpabuf_alloc_copy(adv_proto, 2 + adv_proto[1]);
|
|
|
|
if (query->adv_proto == NULL) {
|
|
|
|
gas_query_done(gas, query, GAS_QUERY_AP_INTERNAL_ERROR);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (comeback_delay) {
|
|
|
|
eloop_cancel_timeout(gas_query_timeout, gas, query);
|
|
|
|
query->wait_comeback = 1;
|
|
|
|
gas_query_tx_comeback_req_delay(gas, query, comeback_delay);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Query was completed without comeback mechanism */
|
|
|
|
if (gas_query_append(query, resp, len) < 0) {
|
|
|
|
gas_query_done(gas, query, GAS_QUERY_AP_INTERNAL_ERROR);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
gas_query_done(gas, query, GAS_QUERY_AP_SUCCESS);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void gas_query_rx_comeback(struct gas_query_ap *gas,
|
|
|
|
struct gas_query_pending *query,
|
|
|
|
const u8 *adv_proto, const u8 *resp,
|
|
|
|
size_t len, u8 frag_id, u8 more_frags,
|
|
|
|
u16 comeback_delay)
|
|
|
|
{
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Received comeback response from "
|
|
|
|
MACSTR " (dialog_token=%u frag_id=%u more_frags=%u "
|
|
|
|
"comeback_delay=%u)",
|
|
|
|
MAC2STR(query->addr), query->dialog_token, frag_id,
|
|
|
|
more_frags, comeback_delay);
|
|
|
|
eloop_cancel_timeout(gas_query_rx_comeback_timeout, gas, query);
|
|
|
|
|
|
|
|
if ((size_t) 2 + adv_proto[1] != wpabuf_len(query->adv_proto) ||
|
|
|
|
os_memcmp(adv_proto, wpabuf_head(query->adv_proto),
|
|
|
|
wpabuf_len(query->adv_proto)) != 0) {
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Advertisement Protocol changed "
|
|
|
|
"between initial and comeback response from "
|
|
|
|
MACSTR, MAC2STR(query->addr));
|
|
|
|
gas_query_done(gas, query, GAS_QUERY_AP_PEER_ERROR);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (comeback_delay) {
|
|
|
|
if (frag_id) {
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Invalid comeback response "
|
|
|
|
"with non-zero frag_id and comeback_delay "
|
|
|
|
"from " MACSTR, MAC2STR(query->addr));
|
|
|
|
gas_query_done(gas, query, GAS_QUERY_AP_PEER_ERROR);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
gas_query_tx_comeback_req_delay(gas, query, comeback_delay);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (frag_id != query->next_frag_id) {
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Unexpected frag_id in response "
|
|
|
|
"from " MACSTR, MAC2STR(query->addr));
|
|
|
|
if (frag_id + 1 == query->next_frag_id) {
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Drop frame as possible "
|
|
|
|
"retry of previous fragment");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
gas_query_done(gas, query, GAS_QUERY_AP_PEER_ERROR);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
query->next_frag_id++;
|
|
|
|
|
|
|
|
if (gas_query_append(query, resp, len) < 0) {
|
|
|
|
gas_query_done(gas, query, GAS_QUERY_AP_INTERNAL_ERROR);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (more_frags) {
|
|
|
|
gas_query_tx_comeback_req(gas, query);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
gas_query_done(gas, query, GAS_QUERY_AP_SUCCESS);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gas_query_ap_rx - Indicate reception of a Public Action or Protected Dual
|
|
|
|
* frame
|
|
|
|
* @gas: GAS query data from gas_query_init()
|
|
|
|
* @sa: Source MAC address of the Action frame
|
|
|
|
* @categ: Category of the Action frame
|
|
|
|
* @data: Payload of the Action frame
|
|
|
|
* @len: Length of @data
|
|
|
|
* @freq: Frequency (in MHz) on which the frame was received
|
|
|
|
* Returns: 0 if the Public Action frame was a GAS frame or -1 if not
|
|
|
|
*/
|
|
|
|
int gas_query_ap_rx(struct gas_query_ap *gas, const u8 *sa, u8 categ,
|
|
|
|
const u8 *data, size_t len, int freq)
|
|
|
|
{
|
|
|
|
struct gas_query_pending *query;
|
|
|
|
u8 action, dialog_token, frag_id = 0, more_frags = 0;
|
|
|
|
u16 comeback_delay, resp_len;
|
|
|
|
const u8 *pos, *adv_proto;
|
|
|
|
int prot, pmf;
|
|
|
|
unsigned int left;
|
|
|
|
|
|
|
|
if (!gas || len < 4)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
pos = data;
|
|
|
|
action = *pos++;
|
|
|
|
dialog_token = *pos++;
|
|
|
|
|
|
|
|
if (action != WLAN_PA_GAS_INITIAL_RESP &&
|
|
|
|
action != WLAN_PA_GAS_COMEBACK_RESP)
|
|
|
|
return -1; /* Not a GAS response */
|
|
|
|
|
|
|
|
prot = categ == WLAN_ACTION_PROTECTED_DUAL;
|
|
|
|
pmf = pmf_in_use(gas->hapd, sa);
|
|
|
|
if (prot && !pmf) {
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Drop unexpected protected GAS frame when PMF is disabled");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
if (!prot && pmf) {
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Drop unexpected unprotected GAS frame when PMF is enabled");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
query = gas_query_get_pending(gas, sa, dialog_token);
|
|
|
|
if (query == NULL) {
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: No pending query found for " MACSTR
|
|
|
|
" dialog token %u", MAC2STR(sa), dialog_token);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Response in %d ms from " MACSTR,
|
|
|
|
ms_from_time(&query->last_oper), MAC2STR(sa));
|
|
|
|
|
|
|
|
if (query->wait_comeback && action == WLAN_PA_GAS_INITIAL_RESP) {
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Unexpected initial response from "
|
|
|
|
MACSTR " dialog token %u when waiting for comeback "
|
|
|
|
"response", MAC2STR(sa), dialog_token);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!query->wait_comeback && action == WLAN_PA_GAS_COMEBACK_RESP) {
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Unexpected comeback response from "
|
|
|
|
MACSTR " dialog token %u when waiting for initial "
|
|
|
|
"response", MAC2STR(sa), dialog_token);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
query->status_code = WPA_GET_LE16(pos);
|
|
|
|
pos += 2;
|
|
|
|
|
|
|
|
if (query->status_code == WLAN_STATUS_QUERY_RESP_OUTSTANDING &&
|
|
|
|
action == WLAN_PA_GAS_COMEBACK_RESP) {
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Allow non-zero status for outstanding comeback response");
|
|
|
|
} else if (query->status_code != WLAN_STATUS_SUCCESS) {
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Query to " MACSTR " dialog token "
|
|
|
|
"%u failed - status code %u",
|
|
|
|
MAC2STR(sa), dialog_token, query->status_code);
|
|
|
|
gas_query_done(gas, query, GAS_QUERY_AP_FAILURE);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (action == WLAN_PA_GAS_COMEBACK_RESP) {
|
|
|
|
if (pos + 1 > data + len)
|
|
|
|
return 0;
|
|
|
|
frag_id = *pos & 0x7f;
|
|
|
|
more_frags = (*pos & 0x80) >> 7;
|
|
|
|
pos++;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Comeback Delay */
|
|
|
|
if (pos + 2 > data + len)
|
|
|
|
return 0;
|
|
|
|
comeback_delay = WPA_GET_LE16(pos);
|
2022-05-08 11:02:40 +02:00
|
|
|
if (comeback_delay > GAS_QUERY_MAX_COMEBACK_DELAY)
|
|
|
|
comeback_delay = GAS_QUERY_MAX_COMEBACK_DELAY;
|
2017-06-15 21:16:45 +02:00
|
|
|
pos += 2;
|
|
|
|
|
|
|
|
/* Advertisement Protocol element */
|
|
|
|
if (pos + 2 > data + len || pos + 2 + pos[1] > data + len) {
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: No room for Advertisement "
|
|
|
|
"Protocol element in the response from " MACSTR,
|
|
|
|
MAC2STR(sa));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (*pos != WLAN_EID_ADV_PROTO) {
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Unexpected Advertisement "
|
|
|
|
"Protocol element ID %u in response from " MACSTR,
|
|
|
|
*pos, MAC2STR(sa));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
adv_proto = pos;
|
|
|
|
pos += 2 + pos[1];
|
|
|
|
|
|
|
|
/* Query Response Length */
|
|
|
|
if (pos + 2 > data + len) {
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: No room for GAS Response Length");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
resp_len = WPA_GET_LE16(pos);
|
|
|
|
pos += 2;
|
|
|
|
|
|
|
|
left = data + len - pos;
|
|
|
|
if (resp_len > left) {
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Truncated Query Response in "
|
|
|
|
"response from " MACSTR, MAC2STR(sa));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (resp_len < left) {
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Ignore %u octets of extra data "
|
|
|
|
"after Query Response from " MACSTR,
|
|
|
|
left - resp_len, MAC2STR(sa));
|
|
|
|
}
|
|
|
|
|
|
|
|
if (action == WLAN_PA_GAS_COMEBACK_RESP)
|
|
|
|
gas_query_rx_comeback(gas, query, adv_proto, pos, resp_len,
|
|
|
|
frag_id, more_frags, comeback_delay);
|
|
|
|
else
|
|
|
|
gas_query_rx_initial(gas, query, adv_proto, pos, resp_len,
|
|
|
|
comeback_delay);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void gas_query_timeout(void *eloop_data, void *user_ctx)
|
|
|
|
{
|
|
|
|
struct gas_query_ap *gas = eloop_data;
|
|
|
|
struct gas_query_pending *query = user_ctx;
|
|
|
|
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: No response received for query to " MACSTR
|
|
|
|
" dialog token %u",
|
|
|
|
MAC2STR(query->addr), query->dialog_token);
|
|
|
|
gas_query_done(gas, query, GAS_QUERY_AP_TIMEOUT);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int gas_query_dialog_token_available(struct gas_query_ap *gas,
|
|
|
|
const u8 *dst, u8 dialog_token)
|
|
|
|
{
|
|
|
|
struct gas_query_pending *q;
|
|
|
|
dl_list_for_each(q, &gas->pending, struct gas_query_pending, list) {
|
|
|
|
if (os_memcmp(dst, q->addr, ETH_ALEN) == 0 &&
|
|
|
|
dialog_token == q->dialog_token)
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void gas_query_tx_initial_req(struct gas_query_ap *gas,
|
|
|
|
struct gas_query_pending *query)
|
|
|
|
{
|
|
|
|
if (gas_query_tx(gas, query, query->req,
|
|
|
|
GAS_QUERY_WAIT_TIME_INITIAL) < 0) {
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Failed to send Action frame to "
|
|
|
|
MACSTR, MAC2STR(query->addr));
|
|
|
|
gas_query_done(gas, query, GAS_QUERY_AP_INTERNAL_ERROR);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
gas->current = query;
|
|
|
|
|
|
|
|
wpa_printf(MSG_DEBUG, "GAS: Starting query timeout for dialog token %u",
|
|
|
|
query->dialog_token);
|
|
|
|
eloop_register_timeout(GAS_QUERY_TIMEOUT_PERIOD, 0,
|
|
|
|
gas_query_timeout, gas, query);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int gas_query_new_dialog_token(struct gas_query_ap *gas, const u8 *dst)
|
|
|
|
{
|
|
|
|
static int next_start = 0;
|
|
|
|
int dialog_token;
|
|
|
|
|
|
|
|
for (dialog_token = 0; dialog_token < 256; dialog_token++) {
|
|
|
|
if (gas_query_dialog_token_available(
|
|
|
|
gas, dst, (next_start + dialog_token) % 256))
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (dialog_token == 256)
|
|
|
|
return -1; /* Too many pending queries */
|
|
|
|
dialog_token = (next_start + dialog_token) % 256;
|
|
|
|
next_start = (dialog_token + 1) % 256;
|
|
|
|
return dialog_token;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gas_query_ap_req - Request a GAS query
|
|
|
|
* @gas: GAS query data from gas_query_init()
|
|
|
|
* @dst: Destination MAC address for the query
|
|
|
|
* @freq: Frequency (in MHz) for the channel on which to send the query
|
|
|
|
* @req: GAS query payload (to be freed by gas_query module in case of success
|
|
|
|
* return)
|
|
|
|
* @cb: Callback function for reporting GAS query result and response
|
|
|
|
* @ctx: Context pointer to use with the @cb call
|
|
|
|
* Returns: dialog token (>= 0) on success or -1 on failure
|
|
|
|
*/
|
|
|
|
int gas_query_ap_req(struct gas_query_ap *gas, const u8 *dst, int freq,
|
|
|
|
struct wpabuf *req,
|
|
|
|
void (*cb)(void *ctx, const u8 *dst, u8 dialog_token,
|
|
|
|
enum gas_query_ap_result result,
|
|
|
|
const struct wpabuf *adv_proto,
|
|
|
|
const struct wpabuf *resp, u16 status_code),
|
|
|
|
void *ctx)
|
|
|
|
{
|
|
|
|
struct gas_query_pending *query;
|
|
|
|
int dialog_token;
|
|
|
|
|
|
|
|
if (!gas || wpabuf_len(req) < 3)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
dialog_token = gas_query_new_dialog_token(gas, dst);
|
|
|
|
if (dialog_token < 0)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
query = os_zalloc(sizeof(*query));
|
|
|
|
if (query == NULL)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
query->gas = gas;
|
|
|
|
os_memcpy(query->addr, dst, ETH_ALEN);
|
|
|
|
query->dialog_token = dialog_token;
|
|
|
|
query->freq = freq;
|
|
|
|
query->cb = cb;
|
|
|
|
query->ctx = ctx;
|
|
|
|
query->req = req;
|
|
|
|
dl_list_add(&gas->pending, &query->list);
|
|
|
|
|
|
|
|
*(wpabuf_mhead_u8(req) + 2) = dialog_token;
|
|
|
|
|
|
|
|
wpa_msg(gas->msg_ctx, MSG_INFO, GAS_QUERY_START "addr=" MACSTR
|
|
|
|
" dialog_token=%u freq=%d",
|
|
|
|
MAC2STR(query->addr), query->dialog_token, query->freq);
|
|
|
|
|
|
|
|
gas_query_tx_initial_req(gas, query);
|
|
|
|
|
|
|
|
return dialog_token;
|
|
|
|
}
|