mirror of
https://github.com/vanhoefm/fragattacks.git
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1f52c2f7b5
GAS_QUERY_TIMEOUT value was used for two different things - enum for status callback and #define for internal eloop timeout). The latter overwrites the former and as such, the timeout reported ended up going out with value 5 which matches with GAS_QUERY_CANCELLED instead of GAS_QUERY_TIMEOUT. This value was not used in existing code, so this should not modify the current behavior. Anyway, the correct reason for the failure should be reported. Rename the internal #define for the timeout period to avoid the name conflict. [Bug 463] Signed-hostap: Jouni Malinen <j@w1.fi>
476 lines
12 KiB
C
476 lines
12 KiB
C
/*
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* Generic advertisement service (GAS) query
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* Copyright (c) 2009, Atheros Communications
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* Copyright (c) 2011, Qualcomm Atheros
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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 "common/ieee802_11_defs.h"
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#include "common/gas.h"
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#include "wpa_supplicant_i.h"
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#include "driver_i.h"
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#include "offchannel.h"
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#include "gas_query.h"
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#define GAS_QUERY_TIMEOUT_PERIOD 5
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struct gas_query_pending {
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struct dl_list list;
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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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int freq;
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u16 status_code;
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struct wpabuf *adv_proto;
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struct wpabuf *resp;
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void (*cb)(void *ctx, const u8 *dst, u8 dialog_token,
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enum gas_query_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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};
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struct gas_query {
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struct wpa_supplicant *wpa_s;
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struct dl_list pending; /* struct gas_query_pending */
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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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struct gas_query * gas_query_init(struct wpa_supplicant *wpa_s)
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{
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struct gas_query *gas;
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gas = os_zalloc(sizeof(*gas));
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if (gas == NULL)
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return NULL;
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gas->wpa_s = wpa_s;
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dl_list_init(&gas->pending);
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return gas;
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}
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static void gas_query_done(struct gas_query *gas,
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struct gas_query_pending *query,
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enum gas_query_result result)
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{
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if (query->offchannel_tx_started)
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offchannel_send_action_done(gas->wpa_s);
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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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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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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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void gas_query_deinit(struct gas_query *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_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 *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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static int gas_query_tx(struct gas_query *gas, struct gas_query_pending *query,
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struct wpabuf *req)
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{
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int res;
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wpa_printf(MSG_DEBUG, "GAS: Send action frame to " MACSTR " len=%u "
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"freq=%d", MAC2STR(query->addr),
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(unsigned int) wpabuf_len(req), query->freq);
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res = offchannel_send_action(gas->wpa_s, query->freq, query->addr,
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gas->wpa_s->own_addr, query->addr,
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wpabuf_head(req), wpabuf_len(req), 1000,
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NULL, 0);
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if (res == 0)
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query->offchannel_tx_started = 1;
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return res;
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}
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static void gas_query_tx_comeback_req(struct gas_query *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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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_INTERNAL_ERROR);
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return;
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}
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if (gas_query_tx(gas, query, req) < 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_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_tx_comeback_timeout(void *eloop_data, void *user_ctx)
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{
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struct gas_query *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 *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 *gas,
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struct gas_query_pending *query,
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const u8 *adv_proto, const u8 *resp,
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size_t len, u16 comeback_delay)
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{
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wpa_printf(MSG_DEBUG, "GAS: Received initial response from "
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MACSTR " (dialog_token=%u comeback_delay=%u)",
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MAC2STR(query->addr), query->dialog_token, comeback_delay);
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query->adv_proto = wpabuf_alloc_copy(adv_proto, 2 + adv_proto[1]);
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if (query->adv_proto == NULL) {
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gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR);
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return;
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}
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if (comeback_delay) {
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query->wait_comeback = 1;
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gas_query_tx_comeback_req_delay(gas, query, comeback_delay);
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return;
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}
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/* Query was completed without comeback mechanism */
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if (gas_query_append(query, resp, len) < 0) {
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gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR);
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return;
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}
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gas_query_done(gas, query, GAS_QUERY_SUCCESS);
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}
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static void gas_query_rx_comeback(struct gas_query *gas,
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struct gas_query_pending *query,
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const u8 *adv_proto, const u8 *resp,
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size_t len, u8 frag_id, u8 more_frags,
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u16 comeback_delay)
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{
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wpa_printf(MSG_DEBUG, "GAS: Received comeback response from "
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MACSTR " (dialog_token=%u frag_id=%u more_frags=%u "
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"comeback_delay=%u)",
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MAC2STR(query->addr), query->dialog_token, frag_id,
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more_frags, comeback_delay);
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if ((size_t) 2 + adv_proto[1] != wpabuf_len(query->adv_proto) ||
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os_memcmp(adv_proto, wpabuf_head(query->adv_proto),
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wpabuf_len(query->adv_proto)) != 0) {
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wpa_printf(MSG_DEBUG, "GAS: Advertisement Protocol changed "
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"between initial and comeback response from "
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MACSTR, MAC2STR(query->addr));
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gas_query_done(gas, query, GAS_QUERY_PEER_ERROR);
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return;
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}
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if (comeback_delay) {
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if (frag_id) {
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wpa_printf(MSG_DEBUG, "GAS: Invalid comeback response "
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"with non-zero frag_id and comeback_delay "
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"from " MACSTR, MAC2STR(query->addr));
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gas_query_done(gas, query, GAS_QUERY_PEER_ERROR);
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return;
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}
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gas_query_tx_comeback_req_delay(gas, query, comeback_delay);
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return;
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}
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if (frag_id != query->next_frag_id) {
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wpa_printf(MSG_DEBUG, "GAS: Unexpected frag_id in response "
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"from " MACSTR, MAC2STR(query->addr));
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gas_query_done(gas, query, GAS_QUERY_PEER_ERROR);
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return;
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}
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query->next_frag_id++;
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if (gas_query_append(query, resp, len) < 0) {
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gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR);
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return;
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}
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if (more_frags) {
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gas_query_tx_comeback_req(gas, query);
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return;
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}
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gas_query_done(gas, query, GAS_QUERY_SUCCESS);
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}
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int gas_query_rx(struct gas_query *gas, const u8 *da, const u8 *sa,
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const u8 *bssid, const u8 *data, size_t len, int freq)
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{
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struct gas_query_pending *query;
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u8 action, dialog_token, frag_id = 0, more_frags = 0;
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u16 comeback_delay, resp_len;
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const u8 *pos, *adv_proto;
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if (gas == NULL || len < 4)
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return -1;
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pos = data;
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action = *pos++;
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dialog_token = *pos++;
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if (action != WLAN_PA_GAS_INITIAL_RESP &&
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action != WLAN_PA_GAS_COMEBACK_RESP)
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return -1; /* Not a GAS response */
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query = gas_query_get_pending(gas, sa, dialog_token);
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if (query == NULL) {
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wpa_printf(MSG_DEBUG, "GAS: No pending query found for " MACSTR
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" dialog token %u", MAC2STR(sa), dialog_token);
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return -1;
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}
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if (query->wait_comeback && action == WLAN_PA_GAS_INITIAL_RESP) {
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wpa_printf(MSG_DEBUG, "GAS: Unexpected initial response from "
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MACSTR " dialog token %u when waiting for comeback "
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"response", MAC2STR(sa), dialog_token);
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return 0;
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}
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if (!query->wait_comeback && action == WLAN_PA_GAS_COMEBACK_RESP) {
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wpa_printf(MSG_DEBUG, "GAS: Unexpected comeback response from "
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MACSTR " dialog token %u when waiting for initial "
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"response", MAC2STR(sa), dialog_token);
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return 0;
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}
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query->status_code = WPA_GET_LE16(pos);
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pos += 2;
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if (query->status_code != WLAN_STATUS_SUCCESS) {
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wpa_printf(MSG_DEBUG, "GAS: Query to " MACSTR " dialog token "
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"%u failed - status code %u",
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MAC2STR(sa), dialog_token, query->status_code);
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gas_query_done(gas, query, GAS_QUERY_FAILURE);
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return 0;
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}
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if (action == WLAN_PA_GAS_COMEBACK_RESP) {
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if (pos + 1 > data + len)
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return 0;
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frag_id = *pos & 0x7f;
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more_frags = (*pos & 0x80) >> 7;
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pos++;
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}
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/* Comeback Delay */
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if (pos + 2 > data + len)
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return 0;
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comeback_delay = WPA_GET_LE16(pos);
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pos += 2;
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/* Advertisement Protocol element */
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if (pos + 2 > data + len || pos + 2 + pos[1] > data + len) {
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wpa_printf(MSG_DEBUG, "GAS: No room for Advertisement "
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"Protocol element in the response from " MACSTR,
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MAC2STR(sa));
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return 0;
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}
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if (*pos != WLAN_EID_ADV_PROTO) {
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wpa_printf(MSG_DEBUG, "GAS: Unexpected Advertisement "
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"Protocol element ID %u in response from " MACSTR,
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*pos, MAC2STR(sa));
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return 0;
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}
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adv_proto = pos;
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pos += 2 + pos[1];
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/* Query Response Length */
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if (pos + 2 > data + len) {
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wpa_printf(MSG_DEBUG, "GAS: No room for GAS Response Length");
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return 0;
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}
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resp_len = WPA_GET_LE16(pos);
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pos += 2;
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if (pos + resp_len > data + len) {
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wpa_printf(MSG_DEBUG, "GAS: Truncated Query Response in "
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"response from " MACSTR, MAC2STR(sa));
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return 0;
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}
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if (pos + resp_len < data + len) {
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wpa_printf(MSG_DEBUG, "GAS: Ignore %u octets of extra data "
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"after Query Response from " MACSTR,
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(unsigned int) (data + len - pos - resp_len),
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MAC2STR(sa));
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}
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if (action == WLAN_PA_GAS_COMEBACK_RESP)
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gas_query_rx_comeback(gas, query, adv_proto, pos, resp_len,
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frag_id, more_frags, comeback_delay);
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else
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gas_query_rx_initial(gas, query, adv_proto, pos, resp_len,
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comeback_delay);
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return 0;
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}
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static void gas_query_timeout(void *eloop_data, void *user_ctx)
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{
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struct gas_query *gas = eloop_data;
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struct gas_query_pending *query = user_ctx;
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wpa_printf(MSG_DEBUG, "GAS: No response received for query to " MACSTR,
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MAC2STR(query->addr));
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gas_query_done(gas, query, GAS_QUERY_TIMEOUT);
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}
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static int gas_query_dialog_token_available(struct gas_query *gas,
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const u8 *dst, 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(dst, q->addr, ETH_ALEN) == 0 &&
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dialog_token == q->dialog_token)
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return 0;
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}
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return 1;
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}
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int gas_query_req(struct gas_query *gas, const u8 *dst, int freq,
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struct wpabuf *req,
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void (*cb)(void *ctx, const u8 *dst, u8 dialog_token,
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enum gas_query_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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{
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struct gas_query_pending *query;
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int dialog_token;
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if (wpabuf_len(req) < 3)
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return -1;
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for (dialog_token = 0; dialog_token < 256; dialog_token++) {
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if (gas_query_dialog_token_available(gas, dst, dialog_token))
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break;
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}
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if (dialog_token == 256)
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return -1; /* Too many pending queries */
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query = os_zalloc(sizeof(*query));
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if (query == NULL)
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return -1;
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os_memcpy(query->addr, dst, ETH_ALEN);
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query->dialog_token = dialog_token;
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query->freq = freq;
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query->cb = cb;
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query->ctx = ctx;
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dl_list_add(&gas->pending, &query->list);
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*(wpabuf_mhead_u8(req) + 2) = dialog_token;
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wpa_printf(MSG_DEBUG, "GAS: Starting request for " MACSTR
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" dialog_token %u", MAC2STR(dst), dialog_token);
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if (gas_query_tx(gas, query, req) < 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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os_free(query);
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return -1;
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}
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eloop_register_timeout(GAS_QUERY_TIMEOUT_PERIOD, 0, gas_query_timeout,
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gas, query);
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return dialog_token;
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}
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void gas_query_cancel(struct gas_query *gas, const u8 *dst, u8 dialog_token)
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{
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struct gas_query_pending *query;
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query = gas_query_get_pending(gas, dst, dialog_token);
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if (query)
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gas_query_done(gas, query, GAS_QUERY_CANCELLED);
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}
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