1*3ff40c12SJohn Marino /* 2*3ff40c12SJohn Marino * Generic advertisement service (GAS) query 3*3ff40c12SJohn Marino * Copyright (c) 2009, Atheros Communications 4*3ff40c12SJohn Marino * Copyright (c) 2011-2014, Qualcomm Atheros, Inc. 5*3ff40c12SJohn Marino * Copyright (c) 2011-2014, Jouni Malinen <j@w1.fi> 6*3ff40c12SJohn Marino * 7*3ff40c12SJohn Marino * This software may be distributed under the terms of the BSD license. 8*3ff40c12SJohn Marino * See README for more details. 9*3ff40c12SJohn Marino */ 10*3ff40c12SJohn Marino 11*3ff40c12SJohn Marino #include "includes.h" 12*3ff40c12SJohn Marino 13*3ff40c12SJohn Marino #include "common.h" 14*3ff40c12SJohn Marino #include "utils/eloop.h" 15*3ff40c12SJohn Marino #include "common/ieee802_11_defs.h" 16*3ff40c12SJohn Marino #include "common/gas.h" 17*3ff40c12SJohn Marino #include "common/wpa_ctrl.h" 18*3ff40c12SJohn Marino #include "rsn_supp/wpa.h" 19*3ff40c12SJohn Marino #include "wpa_supplicant_i.h" 20*3ff40c12SJohn Marino #include "driver_i.h" 21*3ff40c12SJohn Marino #include "offchannel.h" 22*3ff40c12SJohn Marino #include "gas_query.h" 23*3ff40c12SJohn Marino 24*3ff40c12SJohn Marino 25*3ff40c12SJohn Marino /** GAS query timeout in seconds */ 26*3ff40c12SJohn Marino #define GAS_QUERY_TIMEOUT_PERIOD 2 27*3ff40c12SJohn Marino 28*3ff40c12SJohn Marino 29*3ff40c12SJohn Marino /** 30*3ff40c12SJohn Marino * struct gas_query_pending - Pending GAS query 31*3ff40c12SJohn Marino */ 32*3ff40c12SJohn Marino struct gas_query_pending { 33*3ff40c12SJohn Marino struct dl_list list; 34*3ff40c12SJohn Marino struct gas_query *gas; 35*3ff40c12SJohn Marino u8 addr[ETH_ALEN]; 36*3ff40c12SJohn Marino u8 dialog_token; 37*3ff40c12SJohn Marino u8 next_frag_id; 38*3ff40c12SJohn Marino unsigned int wait_comeback:1; 39*3ff40c12SJohn Marino unsigned int offchannel_tx_started:1; 40*3ff40c12SJohn Marino int freq; 41*3ff40c12SJohn Marino u16 status_code; 42*3ff40c12SJohn Marino struct wpabuf *req; 43*3ff40c12SJohn Marino struct wpabuf *adv_proto; 44*3ff40c12SJohn Marino struct wpabuf *resp; 45*3ff40c12SJohn Marino void (*cb)(void *ctx, const u8 *dst, u8 dialog_token, 46*3ff40c12SJohn Marino enum gas_query_result result, 47*3ff40c12SJohn Marino const struct wpabuf *adv_proto, 48*3ff40c12SJohn Marino const struct wpabuf *resp, u16 status_code); 49*3ff40c12SJohn Marino void *ctx; 50*3ff40c12SJohn Marino }; 51*3ff40c12SJohn Marino 52*3ff40c12SJohn Marino /** 53*3ff40c12SJohn Marino * struct gas_query - Internal GAS query data 54*3ff40c12SJohn Marino */ 55*3ff40c12SJohn Marino struct gas_query { 56*3ff40c12SJohn Marino struct wpa_supplicant *wpa_s; 57*3ff40c12SJohn Marino struct dl_list pending; /* struct gas_query_pending */ 58*3ff40c12SJohn Marino struct gas_query_pending *current; 59*3ff40c12SJohn Marino struct wpa_radio_work *work; 60*3ff40c12SJohn Marino }; 61*3ff40c12SJohn Marino 62*3ff40c12SJohn Marino 63*3ff40c12SJohn Marino static void gas_query_tx_comeback_timeout(void *eloop_data, void *user_ctx); 64*3ff40c12SJohn Marino static void gas_query_timeout(void *eloop_data, void *user_ctx); 65*3ff40c12SJohn Marino 66*3ff40c12SJohn Marino 67*3ff40c12SJohn Marino /** 68*3ff40c12SJohn Marino * gas_query_init - Initialize GAS query component 69*3ff40c12SJohn Marino * @wpa_s: Pointer to wpa_supplicant data 70*3ff40c12SJohn Marino * Returns: Pointer to GAS query data or %NULL on failure 71*3ff40c12SJohn Marino */ 72*3ff40c12SJohn Marino struct gas_query * gas_query_init(struct wpa_supplicant *wpa_s) 73*3ff40c12SJohn Marino { 74*3ff40c12SJohn Marino struct gas_query *gas; 75*3ff40c12SJohn Marino 76*3ff40c12SJohn Marino gas = os_zalloc(sizeof(*gas)); 77*3ff40c12SJohn Marino if (gas == NULL) 78*3ff40c12SJohn Marino return NULL; 79*3ff40c12SJohn Marino 80*3ff40c12SJohn Marino gas->wpa_s = wpa_s; 81*3ff40c12SJohn Marino dl_list_init(&gas->pending); 82*3ff40c12SJohn Marino 83*3ff40c12SJohn Marino return gas; 84*3ff40c12SJohn Marino } 85*3ff40c12SJohn Marino 86*3ff40c12SJohn Marino 87*3ff40c12SJohn Marino static const char * gas_result_txt(enum gas_query_result result) 88*3ff40c12SJohn Marino { 89*3ff40c12SJohn Marino switch (result) { 90*3ff40c12SJohn Marino case GAS_QUERY_SUCCESS: 91*3ff40c12SJohn Marino return "SUCCESS"; 92*3ff40c12SJohn Marino case GAS_QUERY_FAILURE: 93*3ff40c12SJohn Marino return "FAILURE"; 94*3ff40c12SJohn Marino case GAS_QUERY_TIMEOUT: 95*3ff40c12SJohn Marino return "TIMEOUT"; 96*3ff40c12SJohn Marino case GAS_QUERY_PEER_ERROR: 97*3ff40c12SJohn Marino return "PEER_ERROR"; 98*3ff40c12SJohn Marino case GAS_QUERY_INTERNAL_ERROR: 99*3ff40c12SJohn Marino return "INTERNAL_ERROR"; 100*3ff40c12SJohn Marino case GAS_QUERY_CANCELLED: 101*3ff40c12SJohn Marino return "CANCELLED"; 102*3ff40c12SJohn Marino case GAS_QUERY_DELETED_AT_DEINIT: 103*3ff40c12SJohn Marino return "DELETED_AT_DEINIT"; 104*3ff40c12SJohn Marino } 105*3ff40c12SJohn Marino 106*3ff40c12SJohn Marino return "N/A"; 107*3ff40c12SJohn Marino } 108*3ff40c12SJohn Marino 109*3ff40c12SJohn Marino 110*3ff40c12SJohn Marino static void gas_query_free(struct gas_query_pending *query, int del_list) 111*3ff40c12SJohn Marino { 112*3ff40c12SJohn Marino struct gas_query *gas = query->gas; 113*3ff40c12SJohn Marino 114*3ff40c12SJohn Marino if (del_list) 115*3ff40c12SJohn Marino dl_list_del(&query->list); 116*3ff40c12SJohn Marino 117*3ff40c12SJohn Marino if (gas->work && gas->work->ctx == query) { 118*3ff40c12SJohn Marino radio_work_done(gas->work); 119*3ff40c12SJohn Marino gas->work = NULL; 120*3ff40c12SJohn Marino } 121*3ff40c12SJohn Marino 122*3ff40c12SJohn Marino wpabuf_free(query->req); 123*3ff40c12SJohn Marino wpabuf_free(query->adv_proto); 124*3ff40c12SJohn Marino wpabuf_free(query->resp); 125*3ff40c12SJohn Marino os_free(query); 126*3ff40c12SJohn Marino } 127*3ff40c12SJohn Marino 128*3ff40c12SJohn Marino 129*3ff40c12SJohn Marino static void gas_query_done(struct gas_query *gas, 130*3ff40c12SJohn Marino struct gas_query_pending *query, 131*3ff40c12SJohn Marino enum gas_query_result result) 132*3ff40c12SJohn Marino { 133*3ff40c12SJohn Marino wpa_msg(gas->wpa_s, MSG_INFO, GAS_QUERY_DONE "addr=" MACSTR 134*3ff40c12SJohn Marino " dialog_token=%u freq=%d status_code=%u result=%s", 135*3ff40c12SJohn Marino MAC2STR(query->addr), query->dialog_token, query->freq, 136*3ff40c12SJohn Marino query->status_code, gas_result_txt(result)); 137*3ff40c12SJohn Marino if (gas->current == query) 138*3ff40c12SJohn Marino gas->current = NULL; 139*3ff40c12SJohn Marino if (query->offchannel_tx_started) 140*3ff40c12SJohn Marino offchannel_send_action_done(gas->wpa_s); 141*3ff40c12SJohn Marino eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query); 142*3ff40c12SJohn Marino eloop_cancel_timeout(gas_query_timeout, gas, query); 143*3ff40c12SJohn Marino dl_list_del(&query->list); 144*3ff40c12SJohn Marino query->cb(query->ctx, query->addr, query->dialog_token, result, 145*3ff40c12SJohn Marino query->adv_proto, query->resp, query->status_code); 146*3ff40c12SJohn Marino gas_query_free(query, 0); 147*3ff40c12SJohn Marino } 148*3ff40c12SJohn Marino 149*3ff40c12SJohn Marino 150*3ff40c12SJohn Marino /** 151*3ff40c12SJohn Marino * gas_query_deinit - Deinitialize GAS query component 152*3ff40c12SJohn Marino * @gas: GAS query data from gas_query_init() 153*3ff40c12SJohn Marino */ 154*3ff40c12SJohn Marino void gas_query_deinit(struct gas_query *gas) 155*3ff40c12SJohn Marino { 156*3ff40c12SJohn Marino struct gas_query_pending *query, *next; 157*3ff40c12SJohn Marino 158*3ff40c12SJohn Marino if (gas == NULL) 159*3ff40c12SJohn Marino return; 160*3ff40c12SJohn Marino 161*3ff40c12SJohn Marino dl_list_for_each_safe(query, next, &gas->pending, 162*3ff40c12SJohn Marino struct gas_query_pending, list) 163*3ff40c12SJohn Marino gas_query_done(gas, query, GAS_QUERY_DELETED_AT_DEINIT); 164*3ff40c12SJohn Marino 165*3ff40c12SJohn Marino os_free(gas); 166*3ff40c12SJohn Marino } 167*3ff40c12SJohn Marino 168*3ff40c12SJohn Marino 169*3ff40c12SJohn Marino static struct gas_query_pending * 170*3ff40c12SJohn Marino gas_query_get_pending(struct gas_query *gas, const u8 *addr, u8 dialog_token) 171*3ff40c12SJohn Marino { 172*3ff40c12SJohn Marino struct gas_query_pending *q; 173*3ff40c12SJohn Marino dl_list_for_each(q, &gas->pending, struct gas_query_pending, list) { 174*3ff40c12SJohn Marino if (os_memcmp(q->addr, addr, ETH_ALEN) == 0 && 175*3ff40c12SJohn Marino q->dialog_token == dialog_token) 176*3ff40c12SJohn Marino return q; 177*3ff40c12SJohn Marino } 178*3ff40c12SJohn Marino return NULL; 179*3ff40c12SJohn Marino } 180*3ff40c12SJohn Marino 181*3ff40c12SJohn Marino 182*3ff40c12SJohn Marino static int gas_query_append(struct gas_query_pending *query, const u8 *data, 183*3ff40c12SJohn Marino size_t len) 184*3ff40c12SJohn Marino { 185*3ff40c12SJohn Marino if (wpabuf_resize(&query->resp, len) < 0) { 186*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: No memory to store the response"); 187*3ff40c12SJohn Marino return -1; 188*3ff40c12SJohn Marino } 189*3ff40c12SJohn Marino wpabuf_put_data(query->resp, data, len); 190*3ff40c12SJohn Marino return 0; 191*3ff40c12SJohn Marino } 192*3ff40c12SJohn Marino 193*3ff40c12SJohn Marino 194*3ff40c12SJohn Marino static void gas_query_tx_status(struct wpa_supplicant *wpa_s, 195*3ff40c12SJohn Marino unsigned int freq, const u8 *dst, 196*3ff40c12SJohn Marino const u8 *src, const u8 *bssid, 197*3ff40c12SJohn Marino const u8 *data, size_t data_len, 198*3ff40c12SJohn Marino enum offchannel_send_action_result result) 199*3ff40c12SJohn Marino { 200*3ff40c12SJohn Marino struct gas_query_pending *query; 201*3ff40c12SJohn Marino struct gas_query *gas = wpa_s->gas; 202*3ff40c12SJohn Marino 203*3ff40c12SJohn Marino if (gas->current == NULL) { 204*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Unexpected TX status: freq=%u dst=" 205*3ff40c12SJohn Marino MACSTR " result=%d - no query in progress", 206*3ff40c12SJohn Marino freq, MAC2STR(dst), result); 207*3ff40c12SJohn Marino return; 208*3ff40c12SJohn Marino } 209*3ff40c12SJohn Marino 210*3ff40c12SJohn Marino query = gas->current; 211*3ff40c12SJohn Marino 212*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: TX status: freq=%u dst=" MACSTR 213*3ff40c12SJohn Marino " result=%d query=%p dialog_token=%u", 214*3ff40c12SJohn Marino freq, MAC2STR(dst), result, query, query->dialog_token); 215*3ff40c12SJohn Marino if (os_memcmp(dst, query->addr, ETH_ALEN) != 0) { 216*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: TX status for unexpected destination"); 217*3ff40c12SJohn Marino return; 218*3ff40c12SJohn Marino } 219*3ff40c12SJohn Marino 220*3ff40c12SJohn Marino if (result == OFFCHANNEL_SEND_ACTION_SUCCESS) { 221*3ff40c12SJohn Marino eloop_cancel_timeout(gas_query_timeout, gas, query); 222*3ff40c12SJohn Marino eloop_register_timeout(GAS_QUERY_TIMEOUT_PERIOD, 0, 223*3ff40c12SJohn Marino gas_query_timeout, gas, query); 224*3ff40c12SJohn Marino } 225*3ff40c12SJohn Marino if (result == OFFCHANNEL_SEND_ACTION_FAILED) { 226*3ff40c12SJohn Marino eloop_cancel_timeout(gas_query_timeout, gas, query); 227*3ff40c12SJohn Marino eloop_register_timeout(0, 0, gas_query_timeout, gas, query); 228*3ff40c12SJohn Marino } 229*3ff40c12SJohn Marino } 230*3ff40c12SJohn Marino 231*3ff40c12SJohn Marino 232*3ff40c12SJohn Marino static int pmf_in_use(struct wpa_supplicant *wpa_s, const u8 *addr) 233*3ff40c12SJohn Marino { 234*3ff40c12SJohn Marino if (wpa_s->current_ssid == NULL || 235*3ff40c12SJohn Marino wpa_s->wpa_state < WPA_4WAY_HANDSHAKE || 236*3ff40c12SJohn Marino os_memcmp(addr, wpa_s->bssid, ETH_ALEN) != 0) 237*3ff40c12SJohn Marino return 0; 238*3ff40c12SJohn Marino return wpa_sm_pmf_enabled(wpa_s->wpa); 239*3ff40c12SJohn Marino } 240*3ff40c12SJohn Marino 241*3ff40c12SJohn Marino 242*3ff40c12SJohn Marino static int gas_query_tx(struct gas_query *gas, struct gas_query_pending *query, 243*3ff40c12SJohn Marino struct wpabuf *req) 244*3ff40c12SJohn Marino { 245*3ff40c12SJohn Marino int res, prot = pmf_in_use(gas->wpa_s, query->addr); 246*3ff40c12SJohn Marino 247*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Send action frame to " MACSTR " len=%u " 248*3ff40c12SJohn Marino "freq=%d prot=%d", MAC2STR(query->addr), 249*3ff40c12SJohn Marino (unsigned int) wpabuf_len(req), query->freq, prot); 250*3ff40c12SJohn Marino if (prot) { 251*3ff40c12SJohn Marino u8 *categ = wpabuf_mhead_u8(req); 252*3ff40c12SJohn Marino *categ = WLAN_ACTION_PROTECTED_DUAL; 253*3ff40c12SJohn Marino } 254*3ff40c12SJohn Marino res = offchannel_send_action(gas->wpa_s, query->freq, query->addr, 255*3ff40c12SJohn Marino gas->wpa_s->own_addr, query->addr, 256*3ff40c12SJohn Marino wpabuf_head(req), wpabuf_len(req), 1000, 257*3ff40c12SJohn Marino gas_query_tx_status, 0); 258*3ff40c12SJohn Marino if (res == 0) 259*3ff40c12SJohn Marino query->offchannel_tx_started = 1; 260*3ff40c12SJohn Marino return res; 261*3ff40c12SJohn Marino } 262*3ff40c12SJohn Marino 263*3ff40c12SJohn Marino 264*3ff40c12SJohn Marino static void gas_query_tx_comeback_req(struct gas_query *gas, 265*3ff40c12SJohn Marino struct gas_query_pending *query) 266*3ff40c12SJohn Marino { 267*3ff40c12SJohn Marino struct wpabuf *req; 268*3ff40c12SJohn Marino 269*3ff40c12SJohn Marino req = gas_build_comeback_req(query->dialog_token); 270*3ff40c12SJohn Marino if (req == NULL) { 271*3ff40c12SJohn Marino gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR); 272*3ff40c12SJohn Marino return; 273*3ff40c12SJohn Marino } 274*3ff40c12SJohn Marino 275*3ff40c12SJohn Marino if (gas_query_tx(gas, query, req) < 0) { 276*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Failed to send Action frame to " 277*3ff40c12SJohn Marino MACSTR, MAC2STR(query->addr)); 278*3ff40c12SJohn Marino gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR); 279*3ff40c12SJohn Marino } 280*3ff40c12SJohn Marino 281*3ff40c12SJohn Marino wpabuf_free(req); 282*3ff40c12SJohn Marino } 283*3ff40c12SJohn Marino 284*3ff40c12SJohn Marino 285*3ff40c12SJohn Marino static void gas_query_tx_comeback_timeout(void *eloop_data, void *user_ctx) 286*3ff40c12SJohn Marino { 287*3ff40c12SJohn Marino struct gas_query *gas = eloop_data; 288*3ff40c12SJohn Marino struct gas_query_pending *query = user_ctx; 289*3ff40c12SJohn Marino 290*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Comeback timeout for request to " MACSTR, 291*3ff40c12SJohn Marino MAC2STR(query->addr)); 292*3ff40c12SJohn Marino gas_query_tx_comeback_req(gas, query); 293*3ff40c12SJohn Marino } 294*3ff40c12SJohn Marino 295*3ff40c12SJohn Marino 296*3ff40c12SJohn Marino static void gas_query_tx_comeback_req_delay(struct gas_query *gas, 297*3ff40c12SJohn Marino struct gas_query_pending *query, 298*3ff40c12SJohn Marino u16 comeback_delay) 299*3ff40c12SJohn Marino { 300*3ff40c12SJohn Marino unsigned int secs, usecs; 301*3ff40c12SJohn Marino 302*3ff40c12SJohn Marino secs = (comeback_delay * 1024) / 1000000; 303*3ff40c12SJohn Marino usecs = comeback_delay * 1024 - secs * 1000000; 304*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Send comeback request to " MACSTR 305*3ff40c12SJohn Marino " in %u secs %u usecs", MAC2STR(query->addr), secs, usecs); 306*3ff40c12SJohn Marino eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query); 307*3ff40c12SJohn Marino eloop_register_timeout(secs, usecs, gas_query_tx_comeback_timeout, 308*3ff40c12SJohn Marino gas, query); 309*3ff40c12SJohn Marino } 310*3ff40c12SJohn Marino 311*3ff40c12SJohn Marino 312*3ff40c12SJohn Marino static void gas_query_rx_initial(struct gas_query *gas, 313*3ff40c12SJohn Marino struct gas_query_pending *query, 314*3ff40c12SJohn Marino const u8 *adv_proto, const u8 *resp, 315*3ff40c12SJohn Marino size_t len, u16 comeback_delay) 316*3ff40c12SJohn Marino { 317*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Received initial response from " 318*3ff40c12SJohn Marino MACSTR " (dialog_token=%u comeback_delay=%u)", 319*3ff40c12SJohn Marino MAC2STR(query->addr), query->dialog_token, comeback_delay); 320*3ff40c12SJohn Marino 321*3ff40c12SJohn Marino query->adv_proto = wpabuf_alloc_copy(adv_proto, 2 + adv_proto[1]); 322*3ff40c12SJohn Marino if (query->adv_proto == NULL) { 323*3ff40c12SJohn Marino gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR); 324*3ff40c12SJohn Marino return; 325*3ff40c12SJohn Marino } 326*3ff40c12SJohn Marino 327*3ff40c12SJohn Marino if (comeback_delay) { 328*3ff40c12SJohn Marino query->wait_comeback = 1; 329*3ff40c12SJohn Marino gas_query_tx_comeback_req_delay(gas, query, comeback_delay); 330*3ff40c12SJohn Marino return; 331*3ff40c12SJohn Marino } 332*3ff40c12SJohn Marino 333*3ff40c12SJohn Marino /* Query was completed without comeback mechanism */ 334*3ff40c12SJohn Marino if (gas_query_append(query, resp, len) < 0) { 335*3ff40c12SJohn Marino gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR); 336*3ff40c12SJohn Marino return; 337*3ff40c12SJohn Marino } 338*3ff40c12SJohn Marino 339*3ff40c12SJohn Marino gas_query_done(gas, query, GAS_QUERY_SUCCESS); 340*3ff40c12SJohn Marino } 341*3ff40c12SJohn Marino 342*3ff40c12SJohn Marino 343*3ff40c12SJohn Marino static void gas_query_rx_comeback(struct gas_query *gas, 344*3ff40c12SJohn Marino struct gas_query_pending *query, 345*3ff40c12SJohn Marino const u8 *adv_proto, const u8 *resp, 346*3ff40c12SJohn Marino size_t len, u8 frag_id, u8 more_frags, 347*3ff40c12SJohn Marino u16 comeback_delay) 348*3ff40c12SJohn Marino { 349*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Received comeback response from " 350*3ff40c12SJohn Marino MACSTR " (dialog_token=%u frag_id=%u more_frags=%u " 351*3ff40c12SJohn Marino "comeback_delay=%u)", 352*3ff40c12SJohn Marino MAC2STR(query->addr), query->dialog_token, frag_id, 353*3ff40c12SJohn Marino more_frags, comeback_delay); 354*3ff40c12SJohn Marino 355*3ff40c12SJohn Marino if ((size_t) 2 + adv_proto[1] != wpabuf_len(query->adv_proto) || 356*3ff40c12SJohn Marino os_memcmp(adv_proto, wpabuf_head(query->adv_proto), 357*3ff40c12SJohn Marino wpabuf_len(query->adv_proto)) != 0) { 358*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Advertisement Protocol changed " 359*3ff40c12SJohn Marino "between initial and comeback response from " 360*3ff40c12SJohn Marino MACSTR, MAC2STR(query->addr)); 361*3ff40c12SJohn Marino gas_query_done(gas, query, GAS_QUERY_PEER_ERROR); 362*3ff40c12SJohn Marino return; 363*3ff40c12SJohn Marino } 364*3ff40c12SJohn Marino 365*3ff40c12SJohn Marino if (comeback_delay) { 366*3ff40c12SJohn Marino if (frag_id) { 367*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Invalid comeback response " 368*3ff40c12SJohn Marino "with non-zero frag_id and comeback_delay " 369*3ff40c12SJohn Marino "from " MACSTR, MAC2STR(query->addr)); 370*3ff40c12SJohn Marino gas_query_done(gas, query, GAS_QUERY_PEER_ERROR); 371*3ff40c12SJohn Marino return; 372*3ff40c12SJohn Marino } 373*3ff40c12SJohn Marino gas_query_tx_comeback_req_delay(gas, query, comeback_delay); 374*3ff40c12SJohn Marino return; 375*3ff40c12SJohn Marino } 376*3ff40c12SJohn Marino 377*3ff40c12SJohn Marino if (frag_id != query->next_frag_id) { 378*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Unexpected frag_id in response " 379*3ff40c12SJohn Marino "from " MACSTR, MAC2STR(query->addr)); 380*3ff40c12SJohn Marino if (frag_id + 1 == query->next_frag_id) { 381*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Drop frame as possible " 382*3ff40c12SJohn Marino "retry of previous fragment"); 383*3ff40c12SJohn Marino return; 384*3ff40c12SJohn Marino } 385*3ff40c12SJohn Marino gas_query_done(gas, query, GAS_QUERY_PEER_ERROR); 386*3ff40c12SJohn Marino return; 387*3ff40c12SJohn Marino } 388*3ff40c12SJohn Marino query->next_frag_id++; 389*3ff40c12SJohn Marino 390*3ff40c12SJohn Marino if (gas_query_append(query, resp, len) < 0) { 391*3ff40c12SJohn Marino gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR); 392*3ff40c12SJohn Marino return; 393*3ff40c12SJohn Marino } 394*3ff40c12SJohn Marino 395*3ff40c12SJohn Marino if (more_frags) { 396*3ff40c12SJohn Marino gas_query_tx_comeback_req(gas, query); 397*3ff40c12SJohn Marino return; 398*3ff40c12SJohn Marino } 399*3ff40c12SJohn Marino 400*3ff40c12SJohn Marino gas_query_done(gas, query, GAS_QUERY_SUCCESS); 401*3ff40c12SJohn Marino } 402*3ff40c12SJohn Marino 403*3ff40c12SJohn Marino 404*3ff40c12SJohn Marino /** 405*3ff40c12SJohn Marino * gas_query_rx - Indicate reception of a Public Action or Protected Dual frame 406*3ff40c12SJohn Marino * @gas: GAS query data from gas_query_init() 407*3ff40c12SJohn Marino * @da: Destination MAC address of the Action frame 408*3ff40c12SJohn Marino * @sa: Source MAC address of the Action frame 409*3ff40c12SJohn Marino * @bssid: BSSID of the Action frame 410*3ff40c12SJohn Marino * @categ: Category of the Action frame 411*3ff40c12SJohn Marino * @data: Payload of the Action frame 412*3ff40c12SJohn Marino * @len: Length of @data 413*3ff40c12SJohn Marino * @freq: Frequency (in MHz) on which the frame was received 414*3ff40c12SJohn Marino * Returns: 0 if the Public Action frame was a GAS frame or -1 if not 415*3ff40c12SJohn Marino */ 416*3ff40c12SJohn Marino int gas_query_rx(struct gas_query *gas, const u8 *da, const u8 *sa, 417*3ff40c12SJohn Marino const u8 *bssid, u8 categ, const u8 *data, size_t len, 418*3ff40c12SJohn Marino int freq) 419*3ff40c12SJohn Marino { 420*3ff40c12SJohn Marino struct gas_query_pending *query; 421*3ff40c12SJohn Marino u8 action, dialog_token, frag_id = 0, more_frags = 0; 422*3ff40c12SJohn Marino u16 comeback_delay, resp_len; 423*3ff40c12SJohn Marino const u8 *pos, *adv_proto; 424*3ff40c12SJohn Marino int prot, pmf; 425*3ff40c12SJohn Marino 426*3ff40c12SJohn Marino if (gas == NULL || len < 4) 427*3ff40c12SJohn Marino return -1; 428*3ff40c12SJohn Marino 429*3ff40c12SJohn Marino prot = categ == WLAN_ACTION_PROTECTED_DUAL; 430*3ff40c12SJohn Marino pmf = pmf_in_use(gas->wpa_s, bssid); 431*3ff40c12SJohn Marino if (prot && !pmf) { 432*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Drop unexpected protected GAS frame when PMF is disabled"); 433*3ff40c12SJohn Marino return 0; 434*3ff40c12SJohn Marino } 435*3ff40c12SJohn Marino if (!prot && pmf) { 436*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Drop unexpected unprotected GAS frame when PMF is enabled"); 437*3ff40c12SJohn Marino return 0; 438*3ff40c12SJohn Marino } 439*3ff40c12SJohn Marino 440*3ff40c12SJohn Marino pos = data; 441*3ff40c12SJohn Marino action = *pos++; 442*3ff40c12SJohn Marino dialog_token = *pos++; 443*3ff40c12SJohn Marino 444*3ff40c12SJohn Marino if (action != WLAN_PA_GAS_INITIAL_RESP && 445*3ff40c12SJohn Marino action != WLAN_PA_GAS_COMEBACK_RESP) 446*3ff40c12SJohn Marino return -1; /* Not a GAS response */ 447*3ff40c12SJohn Marino 448*3ff40c12SJohn Marino query = gas_query_get_pending(gas, sa, dialog_token); 449*3ff40c12SJohn Marino if (query == NULL) { 450*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: No pending query found for " MACSTR 451*3ff40c12SJohn Marino " dialog token %u", MAC2STR(sa), dialog_token); 452*3ff40c12SJohn Marino return -1; 453*3ff40c12SJohn Marino } 454*3ff40c12SJohn Marino 455*3ff40c12SJohn Marino if (query->wait_comeback && action == WLAN_PA_GAS_INITIAL_RESP) { 456*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Unexpected initial response from " 457*3ff40c12SJohn Marino MACSTR " dialog token %u when waiting for comeback " 458*3ff40c12SJohn Marino "response", MAC2STR(sa), dialog_token); 459*3ff40c12SJohn Marino return 0; 460*3ff40c12SJohn Marino } 461*3ff40c12SJohn Marino 462*3ff40c12SJohn Marino if (!query->wait_comeback && action == WLAN_PA_GAS_COMEBACK_RESP) { 463*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Unexpected comeback response from " 464*3ff40c12SJohn Marino MACSTR " dialog token %u when waiting for initial " 465*3ff40c12SJohn Marino "response", MAC2STR(sa), dialog_token); 466*3ff40c12SJohn Marino return 0; 467*3ff40c12SJohn Marino } 468*3ff40c12SJohn Marino 469*3ff40c12SJohn Marino query->status_code = WPA_GET_LE16(pos); 470*3ff40c12SJohn Marino pos += 2; 471*3ff40c12SJohn Marino 472*3ff40c12SJohn Marino if (query->status_code != WLAN_STATUS_SUCCESS) { 473*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Query to " MACSTR " dialog token " 474*3ff40c12SJohn Marino "%u failed - status code %u", 475*3ff40c12SJohn Marino MAC2STR(sa), dialog_token, query->status_code); 476*3ff40c12SJohn Marino gas_query_done(gas, query, GAS_QUERY_FAILURE); 477*3ff40c12SJohn Marino return 0; 478*3ff40c12SJohn Marino } 479*3ff40c12SJohn Marino 480*3ff40c12SJohn Marino if (action == WLAN_PA_GAS_COMEBACK_RESP) { 481*3ff40c12SJohn Marino if (pos + 1 > data + len) 482*3ff40c12SJohn Marino return 0; 483*3ff40c12SJohn Marino frag_id = *pos & 0x7f; 484*3ff40c12SJohn Marino more_frags = (*pos & 0x80) >> 7; 485*3ff40c12SJohn Marino pos++; 486*3ff40c12SJohn Marino } 487*3ff40c12SJohn Marino 488*3ff40c12SJohn Marino /* Comeback Delay */ 489*3ff40c12SJohn Marino if (pos + 2 > data + len) 490*3ff40c12SJohn Marino return 0; 491*3ff40c12SJohn Marino comeback_delay = WPA_GET_LE16(pos); 492*3ff40c12SJohn Marino pos += 2; 493*3ff40c12SJohn Marino 494*3ff40c12SJohn Marino /* Advertisement Protocol element */ 495*3ff40c12SJohn Marino if (pos + 2 > data + len || pos + 2 + pos[1] > data + len) { 496*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: No room for Advertisement " 497*3ff40c12SJohn Marino "Protocol element in the response from " MACSTR, 498*3ff40c12SJohn Marino MAC2STR(sa)); 499*3ff40c12SJohn Marino return 0; 500*3ff40c12SJohn Marino } 501*3ff40c12SJohn Marino 502*3ff40c12SJohn Marino if (*pos != WLAN_EID_ADV_PROTO) { 503*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Unexpected Advertisement " 504*3ff40c12SJohn Marino "Protocol element ID %u in response from " MACSTR, 505*3ff40c12SJohn Marino *pos, MAC2STR(sa)); 506*3ff40c12SJohn Marino return 0; 507*3ff40c12SJohn Marino } 508*3ff40c12SJohn Marino 509*3ff40c12SJohn Marino adv_proto = pos; 510*3ff40c12SJohn Marino pos += 2 + pos[1]; 511*3ff40c12SJohn Marino 512*3ff40c12SJohn Marino /* Query Response Length */ 513*3ff40c12SJohn Marino if (pos + 2 > data + len) { 514*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: No room for GAS Response Length"); 515*3ff40c12SJohn Marino return 0; 516*3ff40c12SJohn Marino } 517*3ff40c12SJohn Marino resp_len = WPA_GET_LE16(pos); 518*3ff40c12SJohn Marino pos += 2; 519*3ff40c12SJohn Marino 520*3ff40c12SJohn Marino if (pos + resp_len > data + len) { 521*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Truncated Query Response in " 522*3ff40c12SJohn Marino "response from " MACSTR, MAC2STR(sa)); 523*3ff40c12SJohn Marino return 0; 524*3ff40c12SJohn Marino } 525*3ff40c12SJohn Marino 526*3ff40c12SJohn Marino if (pos + resp_len < data + len) { 527*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Ignore %u octets of extra data " 528*3ff40c12SJohn Marino "after Query Response from " MACSTR, 529*3ff40c12SJohn Marino (unsigned int) (data + len - pos - resp_len), 530*3ff40c12SJohn Marino MAC2STR(sa)); 531*3ff40c12SJohn Marino } 532*3ff40c12SJohn Marino 533*3ff40c12SJohn Marino if (action == WLAN_PA_GAS_COMEBACK_RESP) 534*3ff40c12SJohn Marino gas_query_rx_comeback(gas, query, adv_proto, pos, resp_len, 535*3ff40c12SJohn Marino frag_id, more_frags, comeback_delay); 536*3ff40c12SJohn Marino else 537*3ff40c12SJohn Marino gas_query_rx_initial(gas, query, adv_proto, pos, resp_len, 538*3ff40c12SJohn Marino comeback_delay); 539*3ff40c12SJohn Marino 540*3ff40c12SJohn Marino return 0; 541*3ff40c12SJohn Marino } 542*3ff40c12SJohn Marino 543*3ff40c12SJohn Marino 544*3ff40c12SJohn Marino static void gas_query_timeout(void *eloop_data, void *user_ctx) 545*3ff40c12SJohn Marino { 546*3ff40c12SJohn Marino struct gas_query *gas = eloop_data; 547*3ff40c12SJohn Marino struct gas_query_pending *query = user_ctx; 548*3ff40c12SJohn Marino 549*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: No response received for query to " MACSTR 550*3ff40c12SJohn Marino " dialog token %u", 551*3ff40c12SJohn Marino MAC2STR(query->addr), query->dialog_token); 552*3ff40c12SJohn Marino gas_query_done(gas, query, GAS_QUERY_TIMEOUT); 553*3ff40c12SJohn Marino } 554*3ff40c12SJohn Marino 555*3ff40c12SJohn Marino 556*3ff40c12SJohn Marino static int gas_query_dialog_token_available(struct gas_query *gas, 557*3ff40c12SJohn Marino const u8 *dst, u8 dialog_token) 558*3ff40c12SJohn Marino { 559*3ff40c12SJohn Marino struct gas_query_pending *q; 560*3ff40c12SJohn Marino dl_list_for_each(q, &gas->pending, struct gas_query_pending, list) { 561*3ff40c12SJohn Marino if (os_memcmp(dst, q->addr, ETH_ALEN) == 0 && 562*3ff40c12SJohn Marino dialog_token == q->dialog_token) 563*3ff40c12SJohn Marino return 0; 564*3ff40c12SJohn Marino } 565*3ff40c12SJohn Marino 566*3ff40c12SJohn Marino return 1; 567*3ff40c12SJohn Marino } 568*3ff40c12SJohn Marino 569*3ff40c12SJohn Marino 570*3ff40c12SJohn Marino static void gas_query_start_cb(struct wpa_radio_work *work, int deinit) 571*3ff40c12SJohn Marino { 572*3ff40c12SJohn Marino struct gas_query_pending *query = work->ctx; 573*3ff40c12SJohn Marino struct gas_query *gas = query->gas; 574*3ff40c12SJohn Marino 575*3ff40c12SJohn Marino if (deinit) { 576*3ff40c12SJohn Marino gas_query_free(query, 1); 577*3ff40c12SJohn Marino return; 578*3ff40c12SJohn Marino } 579*3ff40c12SJohn Marino 580*3ff40c12SJohn Marino gas->work = work; 581*3ff40c12SJohn Marino 582*3ff40c12SJohn Marino if (gas_query_tx(gas, query, query->req) < 0) { 583*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Failed to send Action frame to " 584*3ff40c12SJohn Marino MACSTR, MAC2STR(query->addr)); 585*3ff40c12SJohn Marino gas_query_free(query, 1); 586*3ff40c12SJohn Marino return; 587*3ff40c12SJohn Marino } 588*3ff40c12SJohn Marino gas->current = query; 589*3ff40c12SJohn Marino 590*3ff40c12SJohn Marino wpa_printf(MSG_DEBUG, "GAS: Starting query timeout for dialog token %u", 591*3ff40c12SJohn Marino query->dialog_token); 592*3ff40c12SJohn Marino eloop_register_timeout(GAS_QUERY_TIMEOUT_PERIOD, 0, 593*3ff40c12SJohn Marino gas_query_timeout, gas, query); 594*3ff40c12SJohn Marino 595*3ff40c12SJohn Marino } 596*3ff40c12SJohn Marino 597*3ff40c12SJohn Marino 598*3ff40c12SJohn Marino /** 599*3ff40c12SJohn Marino * gas_query_req - Request a GAS query 600*3ff40c12SJohn Marino * @gas: GAS query data from gas_query_init() 601*3ff40c12SJohn Marino * @dst: Destination MAC address for the query 602*3ff40c12SJohn Marino * @freq: Frequency (in MHz) for the channel on which to send the query 603*3ff40c12SJohn Marino * @req: GAS query payload (to be freed by gas_query module in case of success 604*3ff40c12SJohn Marino * return) 605*3ff40c12SJohn Marino * @cb: Callback function for reporting GAS query result and response 606*3ff40c12SJohn Marino * @ctx: Context pointer to use with the @cb call 607*3ff40c12SJohn Marino * Returns: dialog token (>= 0) on success or -1 on failure 608*3ff40c12SJohn Marino */ 609*3ff40c12SJohn Marino int gas_query_req(struct gas_query *gas, const u8 *dst, int freq, 610*3ff40c12SJohn Marino struct wpabuf *req, 611*3ff40c12SJohn Marino void (*cb)(void *ctx, const u8 *dst, u8 dialog_token, 612*3ff40c12SJohn Marino enum gas_query_result result, 613*3ff40c12SJohn Marino const struct wpabuf *adv_proto, 614*3ff40c12SJohn Marino const struct wpabuf *resp, u16 status_code), 615*3ff40c12SJohn Marino void *ctx) 616*3ff40c12SJohn Marino { 617*3ff40c12SJohn Marino struct gas_query_pending *query; 618*3ff40c12SJohn Marino int dialog_token; 619*3ff40c12SJohn Marino static int next_start = 0; 620*3ff40c12SJohn Marino 621*3ff40c12SJohn Marino if (wpabuf_len(req) < 3) 622*3ff40c12SJohn Marino return -1; 623*3ff40c12SJohn Marino 624*3ff40c12SJohn Marino for (dialog_token = 0; dialog_token < 256; dialog_token++) { 625*3ff40c12SJohn Marino if (gas_query_dialog_token_available( 626*3ff40c12SJohn Marino gas, dst, (next_start + dialog_token) % 256)) 627*3ff40c12SJohn Marino break; 628*3ff40c12SJohn Marino } 629*3ff40c12SJohn Marino if (dialog_token == 256) 630*3ff40c12SJohn Marino return -1; /* Too many pending queries */ 631*3ff40c12SJohn Marino dialog_token = (next_start + dialog_token) % 256; 632*3ff40c12SJohn Marino next_start = (dialog_token + 1) % 256; 633*3ff40c12SJohn Marino 634*3ff40c12SJohn Marino query = os_zalloc(sizeof(*query)); 635*3ff40c12SJohn Marino if (query == NULL) 636*3ff40c12SJohn Marino return -1; 637*3ff40c12SJohn Marino 638*3ff40c12SJohn Marino query->gas = gas; 639*3ff40c12SJohn Marino os_memcpy(query->addr, dst, ETH_ALEN); 640*3ff40c12SJohn Marino query->dialog_token = dialog_token; 641*3ff40c12SJohn Marino query->freq = freq; 642*3ff40c12SJohn Marino query->cb = cb; 643*3ff40c12SJohn Marino query->ctx = ctx; 644*3ff40c12SJohn Marino query->req = req; 645*3ff40c12SJohn Marino dl_list_add(&gas->pending, &query->list); 646*3ff40c12SJohn Marino 647*3ff40c12SJohn Marino *(wpabuf_mhead_u8(req) + 2) = dialog_token; 648*3ff40c12SJohn Marino 649*3ff40c12SJohn Marino wpa_msg(gas->wpa_s, MSG_INFO, GAS_QUERY_START "addr=" MACSTR 650*3ff40c12SJohn Marino " dialog_token=%u freq=%d", 651*3ff40c12SJohn Marino MAC2STR(query->addr), query->dialog_token, query->freq); 652*3ff40c12SJohn Marino 653*3ff40c12SJohn Marino if (radio_add_work(gas->wpa_s, freq, "gas-query", 0, gas_query_start_cb, 654*3ff40c12SJohn Marino query) < 0) { 655*3ff40c12SJohn Marino gas_query_free(query, 1); 656*3ff40c12SJohn Marino return -1; 657*3ff40c12SJohn Marino } 658*3ff40c12SJohn Marino 659*3ff40c12SJohn Marino return dialog_token; 660*3ff40c12SJohn Marino } 661*3ff40c12SJohn Marino 662*3ff40c12SJohn Marino 663*3ff40c12SJohn Marino /** 664*3ff40c12SJohn Marino * gas_query_cancel - Cancel a pending GAS query 665*3ff40c12SJohn Marino * @gas: GAS query data from gas_query_init() 666*3ff40c12SJohn Marino * @dst: Destination MAC address for the query 667*3ff40c12SJohn Marino * @dialog_token: Dialog token from gas_query_req() 668*3ff40c12SJohn Marino */ 669*3ff40c12SJohn Marino void gas_query_cancel(struct gas_query *gas, const u8 *dst, u8 dialog_token) 670*3ff40c12SJohn Marino { 671*3ff40c12SJohn Marino struct gas_query_pending *query; 672*3ff40c12SJohn Marino 673*3ff40c12SJohn Marino query = gas_query_get_pending(gas, dst, dialog_token); 674*3ff40c12SJohn Marino if (query) 675*3ff40c12SJohn Marino gas_query_done(gas, query, GAS_QUERY_CANCELLED); 676*3ff40c12SJohn Marino 677*3ff40c12SJohn Marino } 678