--- /dev/null
+/*
+ * 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;
+ 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;
+};
+
+/**
+ * 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;
+};
+
+
+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_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) {
+ eloop_cancel_timeout(gas_query_timeout, gas, query);
+ 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);
+ }
+}
+
+
+static 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", MAC2STR(query->addr),
+ (unsigned int) wpabuf_len(req), query->freq, prot);
+ 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 (!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,
+ gas->wpa_s->own_addr, 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) {
+ 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;
+}
+
+
+/**
+ * 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,
+ 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;
+ 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->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;
+}
projects / mech_eap.git / blobdiff