/*
* Generic advertisement service (GAS) query
* Copyright (c) 2009, Atheros Communications
* Copyright (c) 2011-2014, Qualcomm Atheros, Inc.
* Copyright (c) 2011-2014, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "utils/eloop.h"
#include "common/ieee802_11_defs.h"
#include "common/gas.h"
#include "common/wpa_ctrl.h"
#include "rsn_supp/wpa.h"
#include "wpa_supplicant_i.h"
#include "config.h"
#include "driver_i.h"
#include "offchannel.h"
#include "gas_query.h"
/** GAS query timeout in seconds */
#define GAS_QUERY_TIMEOUT_PERIOD 2
/* GAS query wait-time / duration in ms */
#define GAS_QUERY_WAIT_TIME_INITIAL 1000
#define GAS_QUERY_WAIT_TIME_COMEBACK 150
/**
* struct gas_query_pending - Pending GAS query
*/
struct gas_query_pending {
struct dl_list list;
struct gas_query *gas;
u8 addr[ETH_ALEN];
u8 dialog_token;
u8 next_frag_id;
unsigned int wait_comeback:1;
unsigned int offchannel_tx_started:1;
unsigned int retry:1;
unsigned int wildcard_bssid:1;
int freq;
u16 status_code;
struct wpabuf *req;
struct wpabuf *adv_proto;
struct wpabuf *resp;
struct os_reltime last_oper;
void (*cb)(void *ctx, const u8 *dst, u8 dialog_token,
enum gas_query_result result,
const struct wpabuf *adv_proto,
const struct wpabuf *resp, u16 status_code);
void *ctx;
u8 sa[ETH_ALEN];
};
/**
* struct gas_query - Internal GAS query data
*/
struct gas_query {
struct wpa_supplicant *wpa_s;
struct dl_list pending; /* struct gas_query_pending */
struct gas_query_pending *current;
struct wpa_radio_work *work;
struct os_reltime last_mac_addr_rand;
int last_rand_sa_type;
u8 rand_addr[ETH_ALEN];
};
static void gas_query_tx_comeback_timeout(void *eloop_data, void *user_ctx);
static void gas_query_timeout(void *eloop_data, void *user_ctx);
static void gas_query_rx_comeback_timeout(void *eloop_data, void *user_ctx);
static void gas_query_tx_initial_req(struct gas_query *gas,
struct gas_query_pending *query);
static int gas_query_new_dialog_token(struct gas_query *gas, const u8 *dst);
static int ms_from_time(struct os_reltime *last)
{
struct os_reltime now, res;
os_get_reltime(&now);
os_reltime_sub(&now, last, &res);
return res.sec * 1000 + res.usec / 1000;
}
/**
* gas_query_init - Initialize GAS query component
* @wpa_s: Pointer to wpa_supplicant data
* Returns: Pointer to GAS query data or %NULL on failure
*/
struct gas_query * gas_query_init(struct wpa_supplicant *wpa_s)
{
struct gas_query *gas;
gas = os_zalloc(sizeof(*gas));
if (gas == NULL)
return NULL;
gas->wpa_s = wpa_s;
dl_list_init(&gas->pending);
return gas;
}
static const char * gas_result_txt(enum gas_query_result result)
{
switch (result) {
case GAS_QUERY_SUCCESS:
return "SUCCESS";
case GAS_QUERY_FAILURE:
return "FAILURE";
case GAS_QUERY_TIMEOUT:
return "TIMEOUT";
case GAS_QUERY_PEER_ERROR:
return "PEER_ERROR";
case GAS_QUERY_INTERNAL_ERROR:
return "INTERNAL_ERROR";
case GAS_QUERY_STOPPED:
return "STOPPED";
case GAS_QUERY_DELETED_AT_DEINIT:
return "DELETED_AT_DEINIT";
}
return "N/A";
}
static void gas_query_free(struct gas_query_pending *query, int del_list)
{
struct gas_query *gas = query->gas;
if (del_list)
dl_list_del(&query->list);
if (gas->work && gas->work->ctx == query) {
radio_work_done(gas->work);
gas->work = NULL;
}
wpabuf_free(query->req);
wpabuf_free(query->adv_proto);
wpabuf_free(query->resp);
os_free(query);
}
static void gas_query_done(struct gas_query *gas,
struct gas_query_pending *query,
enum gas_query_result result)
{
wpa_msg(gas->wpa_s, MSG_INFO, GAS_QUERY_DONE "addr=" MACSTR
" dialog_token=%u freq=%d status_code=%u result=%s",
MAC2STR(query->addr), query->dialog_token, query->freq,
query->status_code, gas_result_txt(result));
if (gas->current == query)
gas->current = NULL;
if (query->offchannel_tx_started)
offchannel_send_action_done(gas->wpa_s);
eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query);
eloop_cancel_timeout(gas_query_timeout, gas, query);
eloop_cancel_timeout(gas_query_rx_comeback_timeout, gas, query);
dl_list_del(&query->list);
query->cb(query->ctx, query->addr, query->dialog_token, result,
query->adv_proto, query->resp, query->status_code);
gas_query_free(query, 0);
}
/**
* gas_query_deinit - Deinitialize GAS query component
* @gas: GAS query data from gas_query_init()
*/
void gas_query_deinit(struct gas_query *gas)
{
struct gas_query_pending *query, *next;
if (gas == NULL)
return;
dl_list_for_each_safe(query, next, &gas->pending,
struct gas_query_pending, list)
gas_query_done(gas, query, GAS_QUERY_DELETED_AT_DEINIT);
os_free(gas);
}
static struct gas_query_pending *
gas_query_get_pending(struct gas_query *gas, const u8 *addr, u8 dialog_token)
{
struct gas_query_pending *q;
dl_list_for_each(q, &gas->pending, struct gas_query_pending, list) {
if (os_memcmp(q->addr, addr, ETH_ALEN) == 0 &&
q->dialog_token == dialog_token)
return q;
}
return NULL;
}
static int gas_query_append(struct gas_query_pending *query, const u8 *data,
size_t len)
{
if (wpabuf_resize(&query->resp, len) < 0) {
wpa_printf(MSG_DEBUG, "GAS: No memory to store the response");
return -1;
}
wpabuf_put_data(query->resp, data, len);
return 0;
}
static void gas_query_tx_status(struct wpa_supplicant *wpa_s,
unsigned int freq, const u8 *dst,
const u8 *src, const u8 *bssid,
const u8 *data, size_t data_len,
enum offchannel_send_action_result result)
{
struct gas_query_pending *query;
struct gas_query *gas = wpa_s->gas;
int dur;
if (gas->current == NULL) {
wpa_printf(MSG_DEBUG, "GAS: Unexpected TX status: freq=%u dst="
MACSTR " result=%d - no query in progress",
freq, MAC2STR(dst), result);
return;
}
query = gas->current;
dur = ms_from_time(&query->last_oper);
wpa_printf(MSG_DEBUG, "GAS: TX status: freq=%u dst=" MACSTR
" result=%d query=%p dialog_token=%u dur=%d ms",
freq, MAC2STR(dst), result, query, query->dialog_token, dur);
if (os_memcmp(dst, query->addr, ETH_ALEN) != 0) {
wpa_printf(MSG_DEBUG, "GAS: TX status for unexpected destination");
return;
}
os_get_reltime(&query->last_oper);
if (result == OFFCHANNEL_SEND_ACTION_SUCCESS ||
result == OFFCHANNEL_SEND_ACTION_NO_ACK) {
eloop_cancel_timeout(gas_query_timeout, gas, query);
if (result == OFFCHANNEL_SEND_ACTION_NO_ACK) {
wpa_printf(MSG_DEBUG, "GAS: No ACK to GAS request");
eloop_register_timeout(0, 250000,
gas_query_timeout, gas, query);
} else {
eloop_register_timeout(GAS_QUERY_TIMEOUT_PERIOD, 0,
gas_query_timeout, gas, query);
}
if (query->wait_comeback && !query->retry) {
eloop_cancel_timeout(gas_query_rx_comeback_timeout,
gas, query);
eloop_register_timeout(
0, (GAS_QUERY_WAIT_TIME_COMEBACK + 10) * 1000,
gas_query_rx_comeback_timeout, gas, query);
}
}
if (result == OFFCHANNEL_SEND_ACTION_FAILED) {
eloop_cancel_timeout(gas_query_timeout, gas, query);
eloop_register_timeout(0, 0, gas_query_timeout, gas, query);
}
}
int pmf_in_use(struct wpa_supplicant *wpa_s, const u8 *addr)
{
if (wpa_s->current_ssid == NULL ||
wpa_s->wpa_state < WPA_4WAY_HANDSHAKE ||
os_memcmp(addr, wpa_s->bssid, ETH_ALEN) != 0)
return 0;
return wpa_sm_pmf_enabled(wpa_s->wpa);
}
static int gas_query_tx(struct gas_query *gas, struct gas_query_pending *query,
struct wpabuf *req, unsigned int wait_time)
{
int res, prot = pmf_in_use(gas->wpa_s, query->addr);
const u8 *bssid;
const u8 wildcard_bssid[ETH_ALEN] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};
wpa_printf(MSG_DEBUG, "GAS: Send action frame to " MACSTR " len=%u "
"freq=%d prot=%d using src addr " MACSTR,
MAC2STR(query->addr), (unsigned int) wpabuf_len(req),
query->freq, prot, MAC2STR(query->sa));
if (prot) {
u8 *categ = wpabuf_mhead_u8(req);
*categ = WLAN_ACTION_PROTECTED_DUAL;
}
os_get_reltime(&query->last_oper);
if (gas->wpa_s->max_remain_on_chan &&
wait_time > gas->wpa_s->max_remain_on_chan)
wait_time = gas->wpa_s->max_remain_on_chan;
if (!query->wildcard_bssid &&
(!gas->wpa_s->conf->gas_address3 ||
(gas->wpa_s->current_ssid &&
gas->wpa_s->wpa_state >= WPA_ASSOCIATED &&
os_memcmp(query->addr, gas->wpa_s->bssid, ETH_ALEN) == 0)))
bssid = query->addr;
else
bssid = wildcard_bssid;
res = offchannel_send_action(gas->wpa_s, query->freq, query->addr,
query->sa, bssid, wpabuf_head(req),
wpabuf_len(req), wait_time,
gas_query_tx_status, 0);
if (res == 0)
query->offchannel_tx_started = 1;
return res;
}
static void gas_query_tx_comeback_req(struct gas_query *gas,
struct gas_query_pending *query)
{
struct wpabuf *req;
unsigned int wait_time;
req = gas_build_comeback_req(query->dialog_token);
if (req == NULL) {
gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR);
return;
}
wait_time = (query->retry || !query->offchannel_tx_started) ?
GAS_QUERY_WAIT_TIME_INITIAL : GAS_QUERY_WAIT_TIME_COMEBACK;
if (gas_query_tx(gas, query, req, wait_time) < 0) {
wpa_printf(MSG_DEBUG, "GAS: Failed to send Action frame to "
MACSTR, MAC2STR(query->addr));
gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR);
}
wpabuf_free(req);
}
static void gas_query_rx_comeback_timeout(void *eloop_data, void *user_ctx)
{
struct gas_query *gas = eloop_data;
struct gas_query_pending *query = user_ctx;
int dialog_token;
wpa_printf(MSG_DEBUG,
"GAS: No response to comeback request received (retry=%u)",
query->retry);
if (gas->current != query || query->retry)
return;
dialog_token = gas_query_new_dialog_token(gas, query->addr);
if (dialog_token < 0)
return;
wpa_printf(MSG_DEBUG,
"GAS: Retry GAS query due to comeback response timeout");
query->retry = 1;
query->dialog_token = dialog_token;
*(wpabuf_mhead_u8(query->req) + 2) = dialog_token;
query->wait_comeback = 0;
query->next_frag_id = 0;
wpabuf_free(query->adv_proto);
query->adv_proto = NULL;
eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query);
eloop_cancel_timeout(gas_query_timeout, gas, query);
gas_query_tx_initial_req(gas, query);
}
static void gas_query_tx_comeback_timeout(void *eloop_data, void *user_ctx)
{
struct gas_query *gas = eloop_data;
struct gas_query_pending *query = user_ctx;
wpa_printf(MSG_DEBUG, "GAS: Comeback timeout for request to " MACSTR,
MAC2STR(query->addr));
gas_query_tx_comeback_req(gas, query);
}
static void gas_query_tx_comeback_req_delay(struct gas_query *gas,
struct gas_query_pending *query,
u16 comeback_delay)
{
unsigned int secs, usecs;
if (comeback_delay > 1 && query->offchannel_tx_started) {
offchannel_send_action_done(gas->wpa_s);
query->offchannel_tx_started = 0;
}
secs = (comeback_delay * 1024) / 1000000;
usecs = comeback_delay * 1024 - secs * 1000000;
wpa_printf(MSG_DEBUG, "GAS: Send comeback request to " MACSTR
" in %u secs %u usecs", MAC2STR(query->addr), secs, usecs);
eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query);
eloop_register_timeout(secs, usecs, gas_query_tx_comeback_timeout,
gas, query);
}
static void gas_query_rx_initial(struct gas_query *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_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_INTERNAL_ERROR);
return;
}
gas_query_done(gas, query, GAS_QUERY_SUCCESS);
}
static void gas_query_rx_comeback(struct gas_query *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_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_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_PEER_ERROR);
return;
}
query->next_frag_id++;
if (gas_query_append(query, resp, len) < 0) {
gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR);
return;
}
if (more_frags) {
gas_query_tx_comeback_req(gas, query);
return;
}
gas_query_done(gas, query, GAS_QUERY_SUCCESS);
}
/**
* gas_query_rx - Indicate reception of a Public Action or Protected Dual frame
* @gas: GAS query data from gas_query_init()
* @da: Destination MAC address of the Action frame
* @sa: Source MAC address of the Action frame
* @bssid: BSSID 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_rx(struct gas_query *gas, const u8 *da, const u8 *sa,
const u8 *bssid, 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 == NULL || 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->wpa_s, 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_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);
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 *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_TIMEOUT);
}
static int gas_query_dialog_token_available(struct gas_query *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_start_cb(struct wpa_radio_work *work, int deinit)
{
struct gas_query_pending *query = work->ctx;
struct gas_query *gas = query->gas;
struct wpa_supplicant *wpa_s = gas->wpa_s;
if (deinit) {
if (work->started) {
gas->work = NULL;
gas_query_done(gas, query, GAS_QUERY_DELETED_AT_DEINIT);
return;
}
gas_query_free(query, 1);
return;
}
if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
wpa_msg(wpa_s, MSG_INFO,
"Failed to assign random MAC address for GAS");
gas_query_free(query, 1);
radio_work_done(work);
return;
}
gas->work = work;
gas_query_tx_initial_req(gas, query);
}
static void gas_query_tx_initial_req(struct gas_query *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_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 *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;
}
static int gas_query_set_sa(struct gas_query *gas,
struct gas_query_pending *query)
{
struct wpa_supplicant *wpa_s = gas->wpa_s;
struct os_reltime now;
if (!wpa_s->conf->gas_rand_mac_addr ||
!(wpa_s->current_bss ?
(wpa_s->drv_flags &
WPA_DRIVER_FLAGS_MGMT_TX_RANDOM_TA_CONNECTED) :
(wpa_s->drv_flags & WPA_DRIVER_FLAGS_MGMT_TX_RANDOM_TA))) {
/* Use own MAC address as the transmitter address */
os_memcpy(query->sa, wpa_s->own_addr, ETH_ALEN);
return 0;
}
os_get_reltime(&now);
if (wpa_s->conf->gas_rand_mac_addr == gas->last_rand_sa_type &&
gas->last_mac_addr_rand.sec != 0 &&
!os_reltime_expired(&now, &gas->last_mac_addr_rand,
wpa_s->conf->gas_rand_addr_lifetime)) {
wpa_printf(MSG_DEBUG,
"GAS: Use the previously selected random transmitter address "
MACSTR, MAC2STR(gas->rand_addr));
os_memcpy(query->sa, gas->rand_addr, ETH_ALEN);
return 0;
}
if (wpa_s->conf->gas_rand_mac_addr == 1 &&
random_mac_addr(gas->rand_addr) < 0) {
wpa_printf(MSG_ERROR, "GAS: Failed to get random address");
return -1;
}
if (wpa_s->conf->gas_rand_mac_addr == 2 &&
random_mac_addr_keep_oui(gas->rand_addr) < 0) {
wpa_printf(MSG_ERROR,
"GAS: Failed to get random address with same OUI");
return -1;
}
wpa_printf(MSG_DEBUG, "GAS: Use a new random transmitter address "
MACSTR, MAC2STR(gas->rand_addr));
os_memcpy(query->sa, gas->rand_addr, ETH_ALEN);
os_get_reltime(&gas->last_mac_addr_rand);
gas->last_rand_sa_type = wpa_s->conf->gas_rand_mac_addr;
return 0;
}
/**
* gas_query_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_req(struct gas_query *gas, const u8 *dst, int freq,
int wildcard_bssid, struct wpabuf *req,
void (*cb)(void *ctx, const u8 *dst, u8 dialog_token,
enum gas_query_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 (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;
if (gas_query_set_sa(gas, query)) {
os_free(query);
return -1;
}
os_memcpy(query->addr, dst, ETH_ALEN);
query->dialog_token = dialog_token;
query->wildcard_bssid = !!wildcard_bssid;
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->wpa_s, MSG_INFO, GAS_QUERY_START "addr=" MACSTR
" dialog_token=%u freq=%d",
MAC2STR(query->addr), query->dialog_token, query->freq);
if (radio_add_work(gas->wpa_s, freq, "gas-query", 0, gas_query_start_cb,
query) < 0) {
query->req = NULL; /* caller will free this in error case */
gas_query_free(query, 1);
return -1;
}
return dialog_token;
}
int gas_query_stop(struct gas_query *gas, u8 dialog_token)
{
struct gas_query_pending *query;
dl_list_for_each(query, &gas->pending, struct gas_query_pending, list) {
if (query->dialog_token == dialog_token) {
if (!gas->work) {
/* The pending radio work has not yet been
* started, but the pending entry has a
* reference to the soon to be freed query.
* Need to remove that radio work now to avoid
* leaving behind a reference to freed memory.
*/
radio_remove_pending_work(gas->wpa_s, query);
}
gas_query_done(gas, query, GAS_QUERY_STOPPED);
return 0;
}
}
return -1;
}