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04ea7b79 JM |
1 | /* |
2 | * Generic advertisement service (GAS) query | |
3 | * Copyright (c) 2009, Atheros Communications | |
c5a64e2d | 4 | * Copyright (c) 2011-2014, Qualcomm Atheros, Inc. |
b9e6d700 | 5 | * Copyright (c) 2011-2014, Jouni Malinen <j@w1.fi> |
04ea7b79 | 6 | * |
e22d4d95 JM |
7 | * This software may be distributed under the terms of the BSD license. |
8 | * See README for more details. | |
04ea7b79 JM |
9 | */ |
10 | ||
11 | #include "includes.h" | |
12 | ||
13 | #include "common.h" | |
14 | #include "utils/eloop.h" | |
15 | #include "common/ieee802_11_defs.h" | |
16 | #include "common/gas.h" | |
6ffa1687 | 17 | #include "common/wpa_ctrl.h" |
c5a64e2d | 18 | #include "rsn_supp/wpa.h" |
04ea7b79 JM |
19 | #include "wpa_supplicant_i.h" |
20 | #include "driver_i.h" | |
24f6497c | 21 | #include "offchannel.h" |
04ea7b79 JM |
22 | #include "gas_query.h" |
23 | ||
24 | ||
a38fdf1c | 25 | /** GAS query timeout in seconds */ |
f65f539d | 26 | #define GAS_QUERY_TIMEOUT_PERIOD 2 |
04ea7b79 JM |
27 | |
28 | ||
a38fdf1c JM |
29 | /** |
30 | * struct gas_query_pending - Pending GAS query | |
31 | */ | |
04ea7b79 JM |
32 | struct gas_query_pending { |
33 | struct dl_list list; | |
b9e6d700 | 34 | struct gas_query *gas; |
04ea7b79 JM |
35 | u8 addr[ETH_ALEN]; |
36 | u8 dialog_token; | |
37 | u8 next_frag_id; | |
298716b4 JM |
38 | unsigned int wait_comeback:1; |
39 | unsigned int offchannel_tx_started:1; | |
04ea7b79 JM |
40 | int freq; |
41 | u16 status_code; | |
24c694b4 | 42 | struct wpabuf *req; |
04ea7b79 JM |
43 | struct wpabuf *adv_proto; |
44 | struct wpabuf *resp; | |
230e3735 | 45 | struct os_reltime last_oper; |
04ea7b79 JM |
46 | void (*cb)(void *ctx, const u8 *dst, u8 dialog_token, |
47 | enum gas_query_result result, | |
48 | const struct wpabuf *adv_proto, | |
49 | const struct wpabuf *resp, u16 status_code); | |
50 | void *ctx; | |
51 | }; | |
52 | ||
a38fdf1c JM |
53 | /** |
54 | * struct gas_query - Internal GAS query data | |
55 | */ | |
04ea7b79 JM |
56 | struct gas_query { |
57 | struct wpa_supplicant *wpa_s; | |
58 | struct dl_list pending; /* struct gas_query_pending */ | |
24c694b4 | 59 | struct gas_query_pending *current; |
b9e6d700 | 60 | struct wpa_radio_work *work; |
04ea7b79 JM |
61 | }; |
62 | ||
63 | ||
64 | static void gas_query_tx_comeback_timeout(void *eloop_data, void *user_ctx); | |
65 | static void gas_query_timeout(void *eloop_data, void *user_ctx); | |
66 | ||
67 | ||
230e3735 JM |
68 | static int ms_from_time(struct os_reltime *last) |
69 | { | |
70 | struct os_reltime now, res; | |
71 | ||
72 | os_get_reltime(&now); | |
73 | os_reltime_sub(&now, last, &res); | |
74 | return res.sec * 1000 + res.usec / 1000; | |
75 | } | |
76 | ||
77 | ||
a38fdf1c JM |
78 | /** |
79 | * gas_query_init - Initialize GAS query component | |
80 | * @wpa_s: Pointer to wpa_supplicant data | |
81 | * Returns: Pointer to GAS query data or %NULL on failure | |
82 | */ | |
04ea7b79 JM |
83 | struct gas_query * gas_query_init(struct wpa_supplicant *wpa_s) |
84 | { | |
85 | struct gas_query *gas; | |
86 | ||
87 | gas = os_zalloc(sizeof(*gas)); | |
88 | if (gas == NULL) | |
89 | return NULL; | |
90 | ||
91 | gas->wpa_s = wpa_s; | |
92 | dl_list_init(&gas->pending); | |
93 | ||
94 | return gas; | |
95 | } | |
96 | ||
97 | ||
6ffa1687 JM |
98 | static const char * gas_result_txt(enum gas_query_result result) |
99 | { | |
100 | switch (result) { | |
101 | case GAS_QUERY_SUCCESS: | |
102 | return "SUCCESS"; | |
103 | case GAS_QUERY_FAILURE: | |
104 | return "FAILURE"; | |
105 | case GAS_QUERY_TIMEOUT: | |
106 | return "TIMEOUT"; | |
107 | case GAS_QUERY_PEER_ERROR: | |
108 | return "PEER_ERROR"; | |
109 | case GAS_QUERY_INTERNAL_ERROR: | |
110 | return "INTERNAL_ERROR"; | |
111 | case GAS_QUERY_CANCELLED: | |
112 | return "CANCELLED"; | |
113 | case GAS_QUERY_DELETED_AT_DEINIT: | |
114 | return "DELETED_AT_DEINIT"; | |
115 | } | |
116 | ||
117 | return "N/A"; | |
118 | } | |
119 | ||
120 | ||
b9e6d700 JM |
121 | static void gas_query_free(struct gas_query_pending *query, int del_list) |
122 | { | |
123 | struct gas_query *gas = query->gas; | |
124 | ||
125 | if (del_list) | |
126 | dl_list_del(&query->list); | |
127 | ||
128 | if (gas->work && gas->work->ctx == query) { | |
129 | radio_work_done(gas->work); | |
130 | gas->work = NULL; | |
131 | } | |
132 | ||
133 | wpabuf_free(query->req); | |
134 | wpabuf_free(query->adv_proto); | |
135 | wpabuf_free(query->resp); | |
136 | os_free(query); | |
137 | } | |
138 | ||
139 | ||
04ea7b79 JM |
140 | static void gas_query_done(struct gas_query *gas, |
141 | struct gas_query_pending *query, | |
142 | enum gas_query_result result) | |
143 | { | |
6ffa1687 JM |
144 | wpa_msg(gas->wpa_s, MSG_INFO, GAS_QUERY_DONE "addr=" MACSTR |
145 | " dialog_token=%u freq=%d status_code=%u result=%s", | |
146 | MAC2STR(query->addr), query->dialog_token, query->freq, | |
147 | query->status_code, gas_result_txt(result)); | |
24c694b4 KP |
148 | if (gas->current == query) |
149 | gas->current = NULL; | |
24f6497c JM |
150 | if (query->offchannel_tx_started) |
151 | offchannel_send_action_done(gas->wpa_s); | |
04ea7b79 JM |
152 | eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query); |
153 | eloop_cancel_timeout(gas_query_timeout, gas, query); | |
154 | dl_list_del(&query->list); | |
155 | query->cb(query->ctx, query->addr, query->dialog_token, result, | |
156 | query->adv_proto, query->resp, query->status_code); | |
b9e6d700 | 157 | gas_query_free(query, 0); |
04ea7b79 JM |
158 | } |
159 | ||
160 | ||
a38fdf1c JM |
161 | /** |
162 | * gas_query_deinit - Deinitialize GAS query component | |
163 | * @gas: GAS query data from gas_query_init() | |
164 | */ | |
04ea7b79 JM |
165 | void gas_query_deinit(struct gas_query *gas) |
166 | { | |
167 | struct gas_query_pending *query, *next; | |
168 | ||
169 | if (gas == NULL) | |
170 | return; | |
171 | ||
172 | dl_list_for_each_safe(query, next, &gas->pending, | |
173 | struct gas_query_pending, list) | |
174 | gas_query_done(gas, query, GAS_QUERY_DELETED_AT_DEINIT); | |
175 | ||
176 | os_free(gas); | |
177 | } | |
178 | ||
179 | ||
180 | static struct gas_query_pending * | |
181 | gas_query_get_pending(struct gas_query *gas, const u8 *addr, u8 dialog_token) | |
182 | { | |
183 | struct gas_query_pending *q; | |
184 | dl_list_for_each(q, &gas->pending, struct gas_query_pending, list) { | |
185 | if (os_memcmp(q->addr, addr, ETH_ALEN) == 0 && | |
186 | q->dialog_token == dialog_token) | |
187 | return q; | |
188 | } | |
189 | return NULL; | |
190 | } | |
191 | ||
192 | ||
193 | static int gas_query_append(struct gas_query_pending *query, const u8 *data, | |
194 | size_t len) | |
195 | { | |
196 | if (wpabuf_resize(&query->resp, len) < 0) { | |
197 | wpa_printf(MSG_DEBUG, "GAS: No memory to store the response"); | |
198 | return -1; | |
199 | } | |
200 | wpabuf_put_data(query->resp, data, len); | |
201 | return 0; | |
202 | } | |
203 | ||
204 | ||
a83e5749 JM |
205 | static void gas_query_tx_status(struct wpa_supplicant *wpa_s, |
206 | unsigned int freq, const u8 *dst, | |
207 | const u8 *src, const u8 *bssid, | |
208 | const u8 *data, size_t data_len, | |
209 | enum offchannel_send_action_result result) | |
210 | { | |
313424d4 | 211 | struct gas_query_pending *query; |
a83e5749 | 212 | struct gas_query *gas = wpa_s->gas; |
230e3735 | 213 | int dur; |
a83e5749 | 214 | |
313424d4 JM |
215 | if (gas->current == NULL) { |
216 | wpa_printf(MSG_DEBUG, "GAS: Unexpected TX status: freq=%u dst=" | |
217 | MACSTR " result=%d - no query in progress", | |
218 | freq, MAC2STR(dst), result); | |
219 | return; | |
a83e5749 JM |
220 | } |
221 | ||
313424d4 JM |
222 | query = gas->current; |
223 | ||
230e3735 | 224 | dur = ms_from_time(&query->last_oper); |
a83e5749 | 225 | wpa_printf(MSG_DEBUG, "GAS: TX status: freq=%u dst=" MACSTR |
230e3735 JM |
226 | " result=%d query=%p dialog_token=%u dur=%d ms", |
227 | freq, MAC2STR(dst), result, query, query->dialog_token, dur); | |
313424d4 JM |
228 | if (os_memcmp(dst, query->addr, ETH_ALEN) != 0) { |
229 | wpa_printf(MSG_DEBUG, "GAS: TX status for unexpected destination"); | |
a83e5749 | 230 | return; |
313424d4 | 231 | } |
230e3735 | 232 | os_get_reltime(&query->last_oper); |
a83e5749 JM |
233 | |
234 | if (result == OFFCHANNEL_SEND_ACTION_SUCCESS) { | |
235 | eloop_cancel_timeout(gas_query_timeout, gas, query); | |
236 | eloop_register_timeout(GAS_QUERY_TIMEOUT_PERIOD, 0, | |
237 | gas_query_timeout, gas, query); | |
238 | } | |
239 | if (result == OFFCHANNEL_SEND_ACTION_FAILED) { | |
240 | eloop_cancel_timeout(gas_query_timeout, gas, query); | |
241 | eloop_register_timeout(0, 0, gas_query_timeout, gas, query); | |
242 | } | |
243 | } | |
244 | ||
245 | ||
c5a64e2d JM |
246 | static int pmf_in_use(struct wpa_supplicant *wpa_s, const u8 *addr) |
247 | { | |
248 | if (wpa_s->current_ssid == NULL || | |
249 | wpa_s->wpa_state < WPA_4WAY_HANDSHAKE || | |
250 | os_memcmp(addr, wpa_s->bssid, ETH_ALEN) != 0) | |
251 | return 0; | |
252 | return wpa_sm_pmf_enabled(wpa_s->wpa); | |
253 | } | |
254 | ||
255 | ||
04ea7b79 JM |
256 | static int gas_query_tx(struct gas_query *gas, struct gas_query_pending *query, |
257 | struct wpabuf *req) | |
258 | { | |
55192416 | 259 | unsigned int wait_time; |
c5a64e2d JM |
260 | int res, prot = pmf_in_use(gas->wpa_s, query->addr); |
261 | ||
04ea7b79 | 262 | wpa_printf(MSG_DEBUG, "GAS: Send action frame to " MACSTR " len=%u " |
c5a64e2d JM |
263 | "freq=%d prot=%d", MAC2STR(query->addr), |
264 | (unsigned int) wpabuf_len(req), query->freq, prot); | |
265 | if (prot) { | |
266 | u8 *categ = wpabuf_mhead_u8(req); | |
267 | *categ = WLAN_ACTION_PROTECTED_DUAL; | |
268 | } | |
230e3735 | 269 | os_get_reltime(&query->last_oper); |
55192416 JM |
270 | wait_time = 1000; |
271 | if (gas->wpa_s->max_remain_on_chan && | |
272 | wait_time > gas->wpa_s->max_remain_on_chan) | |
273 | wait_time = gas->wpa_s->max_remain_on_chan; | |
24f6497c JM |
274 | res = offchannel_send_action(gas->wpa_s, query->freq, query->addr, |
275 | gas->wpa_s->own_addr, query->addr, | |
55192416 JM |
276 | wpabuf_head(req), wpabuf_len(req), |
277 | wait_time, gas_query_tx_status, 0); | |
24f6497c JM |
278 | if (res == 0) |
279 | query->offchannel_tx_started = 1; | |
280 | return res; | |
04ea7b79 JM |
281 | } |
282 | ||
283 | ||
284 | static void gas_query_tx_comeback_req(struct gas_query *gas, | |
285 | struct gas_query_pending *query) | |
286 | { | |
287 | struct wpabuf *req; | |
288 | ||
289 | req = gas_build_comeback_req(query->dialog_token); | |
290 | if (req == NULL) { | |
291 | gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR); | |
292 | return; | |
293 | } | |
294 | ||
295 | if (gas_query_tx(gas, query, req) < 0) { | |
296 | wpa_printf(MSG_DEBUG, "GAS: Failed to send Action frame to " | |
297 | MACSTR, MAC2STR(query->addr)); | |
298 | gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR); | |
299 | } | |
300 | ||
301 | wpabuf_free(req); | |
302 | } | |
303 | ||
304 | ||
305 | static void gas_query_tx_comeback_timeout(void *eloop_data, void *user_ctx) | |
306 | { | |
307 | struct gas_query *gas = eloop_data; | |
308 | struct gas_query_pending *query = user_ctx; | |
309 | ||
310 | wpa_printf(MSG_DEBUG, "GAS: Comeback timeout for request to " MACSTR, | |
311 | MAC2STR(query->addr)); | |
312 | gas_query_tx_comeback_req(gas, query); | |
313 | } | |
314 | ||
315 | ||
316 | static void gas_query_tx_comeback_req_delay(struct gas_query *gas, | |
317 | struct gas_query_pending *query, | |
318 | u16 comeback_delay) | |
319 | { | |
320 | unsigned int secs, usecs; | |
321 | ||
322 | secs = (comeback_delay * 1024) / 1000000; | |
323 | usecs = comeback_delay * 1024 - secs * 1000000; | |
324 | wpa_printf(MSG_DEBUG, "GAS: Send comeback request to " MACSTR | |
325 | " in %u secs %u usecs", MAC2STR(query->addr), secs, usecs); | |
326 | eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query); | |
327 | eloop_register_timeout(secs, usecs, gas_query_tx_comeback_timeout, | |
328 | gas, query); | |
329 | } | |
330 | ||
331 | ||
332 | static void gas_query_rx_initial(struct gas_query *gas, | |
333 | struct gas_query_pending *query, | |
334 | const u8 *adv_proto, const u8 *resp, | |
335 | size_t len, u16 comeback_delay) | |
336 | { | |
337 | wpa_printf(MSG_DEBUG, "GAS: Received initial response from " | |
338 | MACSTR " (dialog_token=%u comeback_delay=%u)", | |
339 | MAC2STR(query->addr), query->dialog_token, comeback_delay); | |
340 | ||
341 | query->adv_proto = wpabuf_alloc_copy(adv_proto, 2 + adv_proto[1]); | |
342 | if (query->adv_proto == NULL) { | |
343 | gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR); | |
344 | return; | |
345 | } | |
346 | ||
347 | if (comeback_delay) { | |
348 | query->wait_comeback = 1; | |
349 | gas_query_tx_comeback_req_delay(gas, query, comeback_delay); | |
350 | return; | |
351 | } | |
352 | ||
353 | /* Query was completed without comeback mechanism */ | |
354 | if (gas_query_append(query, resp, len) < 0) { | |
355 | gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR); | |
356 | return; | |
357 | } | |
358 | ||
359 | gas_query_done(gas, query, GAS_QUERY_SUCCESS); | |
360 | } | |
361 | ||
362 | ||
363 | static void gas_query_rx_comeback(struct gas_query *gas, | |
364 | struct gas_query_pending *query, | |
365 | const u8 *adv_proto, const u8 *resp, | |
366 | size_t len, u8 frag_id, u8 more_frags, | |
367 | u16 comeback_delay) | |
368 | { | |
369 | wpa_printf(MSG_DEBUG, "GAS: Received comeback response from " | |
370 | MACSTR " (dialog_token=%u frag_id=%u more_frags=%u " | |
371 | "comeback_delay=%u)", | |
372 | MAC2STR(query->addr), query->dialog_token, frag_id, | |
373 | more_frags, comeback_delay); | |
374 | ||
375 | if ((size_t) 2 + adv_proto[1] != wpabuf_len(query->adv_proto) || | |
376 | os_memcmp(adv_proto, wpabuf_head(query->adv_proto), | |
377 | wpabuf_len(query->adv_proto)) != 0) { | |
378 | wpa_printf(MSG_DEBUG, "GAS: Advertisement Protocol changed " | |
379 | "between initial and comeback response from " | |
380 | MACSTR, MAC2STR(query->addr)); | |
381 | gas_query_done(gas, query, GAS_QUERY_PEER_ERROR); | |
382 | return; | |
383 | } | |
384 | ||
385 | if (comeback_delay) { | |
386 | if (frag_id) { | |
387 | wpa_printf(MSG_DEBUG, "GAS: Invalid comeback response " | |
388 | "with non-zero frag_id and comeback_delay " | |
389 | "from " MACSTR, MAC2STR(query->addr)); | |
390 | gas_query_done(gas, query, GAS_QUERY_PEER_ERROR); | |
391 | return; | |
392 | } | |
393 | gas_query_tx_comeback_req_delay(gas, query, comeback_delay); | |
394 | return; | |
395 | } | |
396 | ||
397 | if (frag_id != query->next_frag_id) { | |
398 | wpa_printf(MSG_DEBUG, "GAS: Unexpected frag_id in response " | |
399 | "from " MACSTR, MAC2STR(query->addr)); | |
9e1ecab1 JM |
400 | if (frag_id + 1 == query->next_frag_id) { |
401 | wpa_printf(MSG_DEBUG, "GAS: Drop frame as possible " | |
402 | "retry of previous fragment"); | |
403 | return; | |
404 | } | |
04ea7b79 JM |
405 | gas_query_done(gas, query, GAS_QUERY_PEER_ERROR); |
406 | return; | |
407 | } | |
408 | query->next_frag_id++; | |
409 | ||
410 | if (gas_query_append(query, resp, len) < 0) { | |
411 | gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR); | |
412 | return; | |
413 | } | |
414 | ||
415 | if (more_frags) { | |
416 | gas_query_tx_comeback_req(gas, query); | |
417 | return; | |
418 | } | |
419 | ||
420 | gas_query_done(gas, query, GAS_QUERY_SUCCESS); | |
421 | } | |
422 | ||
423 | ||
a38fdf1c | 424 | /** |
c5a64e2d | 425 | * gas_query_rx - Indicate reception of a Public Action or Protected Dual frame |
a38fdf1c JM |
426 | * @gas: GAS query data from gas_query_init() |
427 | * @da: Destination MAC address of the Action frame | |
428 | * @sa: Source MAC address of the Action frame | |
429 | * @bssid: BSSID of the Action frame | |
c5a64e2d | 430 | * @categ: Category of the Action frame |
a38fdf1c JM |
431 | * @data: Payload of the Action frame |
432 | * @len: Length of @data | |
433 | * @freq: Frequency (in MHz) on which the frame was received | |
434 | * Returns: 0 if the Public Action frame was a GAS frame or -1 if not | |
435 | */ | |
04ea7b79 | 436 | int gas_query_rx(struct gas_query *gas, const u8 *da, const u8 *sa, |
c5a64e2d JM |
437 | const u8 *bssid, u8 categ, const u8 *data, size_t len, |
438 | int freq) | |
04ea7b79 JM |
439 | { |
440 | struct gas_query_pending *query; | |
441 | u8 action, dialog_token, frag_id = 0, more_frags = 0; | |
442 | u16 comeback_delay, resp_len; | |
443 | const u8 *pos, *adv_proto; | |
c5a64e2d | 444 | int prot, pmf; |
5d017065 | 445 | unsigned int left; |
04ea7b79 JM |
446 | |
447 | if (gas == NULL || len < 4) | |
448 | return -1; | |
449 | ||
c5a64e2d JM |
450 | prot = categ == WLAN_ACTION_PROTECTED_DUAL; |
451 | pmf = pmf_in_use(gas->wpa_s, bssid); | |
452 | if (prot && !pmf) { | |
453 | wpa_printf(MSG_DEBUG, "GAS: Drop unexpected protected GAS frame when PMF is disabled"); | |
454 | return 0; | |
455 | } | |
456 | if (!prot && pmf) { | |
457 | wpa_printf(MSG_DEBUG, "GAS: Drop unexpected unprotected GAS frame when PMF is enabled"); | |
458 | return 0; | |
459 | } | |
460 | ||
04ea7b79 JM |
461 | pos = data; |
462 | action = *pos++; | |
463 | dialog_token = *pos++; | |
464 | ||
465 | if (action != WLAN_PA_GAS_INITIAL_RESP && | |
466 | action != WLAN_PA_GAS_COMEBACK_RESP) | |
467 | return -1; /* Not a GAS response */ | |
468 | ||
469 | query = gas_query_get_pending(gas, sa, dialog_token); | |
470 | if (query == NULL) { | |
471 | wpa_printf(MSG_DEBUG, "GAS: No pending query found for " MACSTR | |
472 | " dialog token %u", MAC2STR(sa), dialog_token); | |
473 | return -1; | |
474 | } | |
475 | ||
230e3735 JM |
476 | wpa_printf(MSG_DEBUG, "GAS: Response in %d ms from " MACSTR, |
477 | ms_from_time(&query->last_oper), MAC2STR(sa)); | |
478 | ||
04ea7b79 JM |
479 | if (query->wait_comeback && action == WLAN_PA_GAS_INITIAL_RESP) { |
480 | wpa_printf(MSG_DEBUG, "GAS: Unexpected initial response from " | |
481 | MACSTR " dialog token %u when waiting for comeback " | |
482 | "response", MAC2STR(sa), dialog_token); | |
483 | return 0; | |
484 | } | |
485 | ||
486 | if (!query->wait_comeback && action == WLAN_PA_GAS_COMEBACK_RESP) { | |
487 | wpa_printf(MSG_DEBUG, "GAS: Unexpected comeback response from " | |
488 | MACSTR " dialog token %u when waiting for initial " | |
489 | "response", MAC2STR(sa), dialog_token); | |
490 | return 0; | |
491 | } | |
492 | ||
493 | query->status_code = WPA_GET_LE16(pos); | |
494 | pos += 2; | |
495 | ||
2af4d87f JM |
496 | if (query->status_code == WLAN_STATUS_QUERY_RESP_OUTSTANDING && |
497 | action == WLAN_PA_GAS_COMEBACK_RESP) { | |
498 | wpa_printf(MSG_DEBUG, "GAS: Allow non-zero status for outstanding comeback response"); | |
499 | } else if (query->status_code != WLAN_STATUS_SUCCESS) { | |
04ea7b79 JM |
500 | wpa_printf(MSG_DEBUG, "GAS: Query to " MACSTR " dialog token " |
501 | "%u failed - status code %u", | |
502 | MAC2STR(sa), dialog_token, query->status_code); | |
503 | gas_query_done(gas, query, GAS_QUERY_FAILURE); | |
504 | return 0; | |
505 | } | |
506 | ||
507 | if (action == WLAN_PA_GAS_COMEBACK_RESP) { | |
508 | if (pos + 1 > data + len) | |
509 | return 0; | |
510 | frag_id = *pos & 0x7f; | |
511 | more_frags = (*pos & 0x80) >> 7; | |
512 | pos++; | |
513 | } | |
514 | ||
515 | /* Comeback Delay */ | |
516 | if (pos + 2 > data + len) | |
517 | return 0; | |
518 | comeback_delay = WPA_GET_LE16(pos); | |
519 | pos += 2; | |
520 | ||
521 | /* Advertisement Protocol element */ | |
522 | if (pos + 2 > data + len || pos + 2 + pos[1] > data + len) { | |
523 | wpa_printf(MSG_DEBUG, "GAS: No room for Advertisement " | |
524 | "Protocol element in the response from " MACSTR, | |
525 | MAC2STR(sa)); | |
526 | return 0; | |
527 | } | |
528 | ||
529 | if (*pos != WLAN_EID_ADV_PROTO) { | |
530 | wpa_printf(MSG_DEBUG, "GAS: Unexpected Advertisement " | |
531 | "Protocol element ID %u in response from " MACSTR, | |
532 | *pos, MAC2STR(sa)); | |
533 | return 0; | |
534 | } | |
535 | ||
536 | adv_proto = pos; | |
537 | pos += 2 + pos[1]; | |
538 | ||
539 | /* Query Response Length */ | |
540 | if (pos + 2 > data + len) { | |
541 | wpa_printf(MSG_DEBUG, "GAS: No room for GAS Response Length"); | |
542 | return 0; | |
543 | } | |
544 | resp_len = WPA_GET_LE16(pos); | |
545 | pos += 2; | |
546 | ||
5d017065 JM |
547 | left = data + len - pos; |
548 | if (resp_len > left) { | |
04ea7b79 JM |
549 | wpa_printf(MSG_DEBUG, "GAS: Truncated Query Response in " |
550 | "response from " MACSTR, MAC2STR(sa)); | |
551 | return 0; | |
552 | } | |
553 | ||
5d017065 | 554 | if (resp_len < left) { |
04ea7b79 JM |
555 | wpa_printf(MSG_DEBUG, "GAS: Ignore %u octets of extra data " |
556 | "after Query Response from " MACSTR, | |
5d017065 | 557 | left - resp_len, MAC2STR(sa)); |
04ea7b79 JM |
558 | } |
559 | ||
560 | if (action == WLAN_PA_GAS_COMEBACK_RESP) | |
561 | gas_query_rx_comeback(gas, query, adv_proto, pos, resp_len, | |
562 | frag_id, more_frags, comeback_delay); | |
563 | else | |
564 | gas_query_rx_initial(gas, query, adv_proto, pos, resp_len, | |
565 | comeback_delay); | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
570 | ||
571 | static void gas_query_timeout(void *eloop_data, void *user_ctx) | |
572 | { | |
573 | struct gas_query *gas = eloop_data; | |
574 | struct gas_query_pending *query = user_ctx; | |
575 | ||
313424d4 JM |
576 | wpa_printf(MSG_DEBUG, "GAS: No response received for query to " MACSTR |
577 | " dialog token %u", | |
578 | MAC2STR(query->addr), query->dialog_token); | |
04ea7b79 JM |
579 | gas_query_done(gas, query, GAS_QUERY_TIMEOUT); |
580 | } | |
581 | ||
582 | ||
583 | static int gas_query_dialog_token_available(struct gas_query *gas, | |
584 | const u8 *dst, u8 dialog_token) | |
585 | { | |
586 | struct gas_query_pending *q; | |
587 | dl_list_for_each(q, &gas->pending, struct gas_query_pending, list) { | |
588 | if (os_memcmp(dst, q->addr, ETH_ALEN) == 0 && | |
589 | dialog_token == q->dialog_token) | |
590 | return 0; | |
591 | } | |
592 | ||
593 | return 1; | |
594 | } | |
595 | ||
596 | ||
b9e6d700 JM |
597 | static void gas_query_start_cb(struct wpa_radio_work *work, int deinit) |
598 | { | |
599 | struct gas_query_pending *query = work->ctx; | |
4bb23215 | 600 | struct gas_query *gas = query->gas; |
c267753b | 601 | struct wpa_supplicant *wpa_s = gas->wpa_s; |
b9e6d700 JM |
602 | |
603 | if (deinit) { | |
b3253ebb AO |
604 | if (work->started) { |
605 | gas->work = NULL; | |
606 | gas_query_done(gas, query, GAS_QUERY_DELETED_AT_DEINIT); | |
607 | return; | |
608 | } | |
609 | ||
b9e6d700 JM |
610 | gas_query_free(query, 1); |
611 | return; | |
612 | } | |
613 | ||
c267753b JM |
614 | if (wpas_update_random_addr_disassoc(wpa_s) < 0) { |
615 | wpa_msg(wpa_s, MSG_INFO, | |
616 | "Failed to assign random MAC address for GAS"); | |
617 | gas_query_free(query, 1); | |
618 | radio_work_done(work); | |
619 | return; | |
620 | } | |
621 | ||
4bb23215 JM |
622 | gas->work = work; |
623 | ||
624 | if (gas_query_tx(gas, query, query->req) < 0) { | |
625 | wpa_printf(MSG_DEBUG, "GAS: Failed to send Action frame to " | |
626 | MACSTR, MAC2STR(query->addr)); | |
627 | gas_query_free(query, 1); | |
628 | return; | |
629 | } | |
630 | gas->current = query; | |
631 | ||
632 | wpa_printf(MSG_DEBUG, "GAS: Starting query timeout for dialog token %u", | |
633 | query->dialog_token); | |
634 | eloop_register_timeout(GAS_QUERY_TIMEOUT_PERIOD, 0, | |
635 | gas_query_timeout, gas, query); | |
636 | ||
b9e6d700 JM |
637 | } |
638 | ||
639 | ||
a38fdf1c JM |
640 | /** |
641 | * gas_query_req - Request a GAS query | |
642 | * @gas: GAS query data from gas_query_init() | |
643 | * @dst: Destination MAC address for the query | |
644 | * @freq: Frequency (in MHz) for the channel on which to send the query | |
24c694b4 KP |
645 | * @req: GAS query payload (to be freed by gas_query module in case of success |
646 | * return) | |
a38fdf1c JM |
647 | * @cb: Callback function for reporting GAS query result and response |
648 | * @ctx: Context pointer to use with the @cb call | |
649 | * Returns: dialog token (>= 0) on success or -1 on failure | |
650 | */ | |
04ea7b79 JM |
651 | int gas_query_req(struct gas_query *gas, const u8 *dst, int freq, |
652 | struct wpabuf *req, | |
653 | void (*cb)(void *ctx, const u8 *dst, u8 dialog_token, | |
654 | enum gas_query_result result, | |
655 | const struct wpabuf *adv_proto, | |
656 | const struct wpabuf *resp, u16 status_code), | |
657 | void *ctx) | |
658 | { | |
659 | struct gas_query_pending *query; | |
660 | int dialog_token; | |
7a56af54 | 661 | static int next_start = 0; |
04ea7b79 JM |
662 | |
663 | if (wpabuf_len(req) < 3) | |
664 | return -1; | |
665 | ||
666 | for (dialog_token = 0; dialog_token < 256; dialog_token++) { | |
7a56af54 JM |
667 | if (gas_query_dialog_token_available( |
668 | gas, dst, (next_start + dialog_token) % 256)) | |
04ea7b79 JM |
669 | break; |
670 | } | |
671 | if (dialog_token == 256) | |
672 | return -1; /* Too many pending queries */ | |
7a56af54 JM |
673 | dialog_token = (next_start + dialog_token) % 256; |
674 | next_start = (dialog_token + 1) % 256; | |
04ea7b79 JM |
675 | |
676 | query = os_zalloc(sizeof(*query)); | |
677 | if (query == NULL) | |
678 | return -1; | |
679 | ||
b9e6d700 | 680 | query->gas = gas; |
04ea7b79 JM |
681 | os_memcpy(query->addr, dst, ETH_ALEN); |
682 | query->dialog_token = dialog_token; | |
683 | query->freq = freq; | |
684 | query->cb = cb; | |
685 | query->ctx = ctx; | |
24c694b4 | 686 | query->req = req; |
04ea7b79 JM |
687 | dl_list_add(&gas->pending, &query->list); |
688 | ||
689 | *(wpabuf_mhead_u8(req) + 2) = dialog_token; | |
690 | ||
6ffa1687 JM |
691 | wpa_msg(gas->wpa_s, MSG_INFO, GAS_QUERY_START "addr=" MACSTR |
692 | " dialog_token=%u freq=%d", | |
693 | MAC2STR(query->addr), query->dialog_token, query->freq); | |
04ea7b79 | 694 | |
b9e6d700 JM |
695 | if (radio_add_work(gas->wpa_s, freq, "gas-query", 0, gas_query_start_cb, |
696 | query) < 0) { | |
697 | gas_query_free(query, 1); | |
698 | return -1; | |
699 | } | |
04ea7b79 JM |
700 | |
701 | return dialog_token; | |
702 | } | |
703 | ||
704 | ||
a38fdf1c JM |
705 | /** |
706 | * gas_query_cancel - Cancel a pending GAS query | |
707 | * @gas: GAS query data from gas_query_init() | |
708 | * @dst: Destination MAC address for the query | |
709 | * @dialog_token: Dialog token from gas_query_req() | |
710 | */ | |
04ea7b79 JM |
711 | void gas_query_cancel(struct gas_query *gas, const u8 *dst, u8 dialog_token) |
712 | { | |
713 | struct gas_query_pending *query; | |
714 | ||
715 | query = gas_query_get_pending(gas, dst, dialog_token); | |
716 | if (query) | |
717 | gas_query_done(gas, query, GAS_QUERY_CANCELLED); | |
718 | ||
719 | } |