Branch data Line data Source code
1 : : /*
2 : : * wpa_supplicant - Off-channel Action frame TX/RX
3 : : * Copyright (c) 2009-2010, Atheros Communications
4 : : * Copyright (c) 2011, Qualcomm Atheros
5 : : *
6 : : * This software may be distributed under the terms of the BSD license.
7 : : * See README for more details.
8 : : */
9 : :
10 : : #include "includes.h"
11 : :
12 : : #include "common.h"
13 : : #include "utils/eloop.h"
14 : : #include "wpa_supplicant_i.h"
15 : : #include "driver_i.h"
16 : : #include "offchannel.h"
17 : :
18 : :
19 : :
20 : : static struct wpa_supplicant *
21 : 878 : wpas_get_tx_interface(struct wpa_supplicant *wpa_s, const u8 *src)
22 : : {
23 : : struct wpa_supplicant *iface;
24 : :
25 [ + - ]: 878 : if (os_memcmp(src, wpa_s->own_addr, ETH_ALEN) == 0)
26 : 878 : return wpa_s;
27 : :
28 : : /*
29 : : * Try to find a group interface that matches with the source address.
30 : : */
31 : 0 : iface = wpa_s->global->ifaces;
32 [ # # ]: 0 : while (iface) {
33 [ # # ]: 0 : if (os_memcmp(wpa_s->pending_action_src,
34 : : iface->own_addr, ETH_ALEN) == 0)
35 : 0 : break;
36 : 0 : iface = iface->next;
37 : : }
38 [ # # ]: 0 : if (iface) {
39 : 0 : wpa_printf(MSG_DEBUG, "P2P: Use group interface %s "
40 : : "instead of interface %s for Action TX",
41 : 0 : iface->ifname, wpa_s->ifname);
42 : 0 : return iface;
43 : : }
44 : :
45 : 878 : return wpa_s;
46 : : }
47 : :
48 : :
49 : 777 : static void wpas_send_action_cb(void *eloop_ctx, void *timeout_ctx)
50 : : {
51 : 777 : struct wpa_supplicant *wpa_s = eloop_ctx;
52 : : struct wpa_supplicant *iface;
53 : : int res;
54 : : int without_roc;
55 : :
56 : 777 : without_roc = wpa_s->pending_action_without_roc;
57 : 777 : wpa_s->pending_action_without_roc = 0;
58 : 777 : wpa_printf(MSG_DEBUG, "Off-channel: Send Action callback "
59 : : "(without_roc=%d pending_action_tx=%p)",
60 : : without_roc, wpa_s->pending_action_tx);
61 : :
62 [ + + ]: 777 : if (wpa_s->pending_action_tx == NULL)
63 : 771 : return;
64 : :
65 : : /*
66 : : * This call is likely going to be on the P2P device instance if the
67 : : * driver uses a separate interface for that purpose. However, some
68 : : * Action frames are actually sent within a P2P Group and when that is
69 : : * the case, we need to follow power saving (e.g., GO buffering the
70 : : * frame for a client in PS mode or a client following the advertised
71 : : * NoA from its GO). To make that easier for the driver, select the
72 : : * correct group interface here.
73 : : */
74 : 6 : iface = wpas_get_tx_interface(wpa_s, wpa_s->pending_action_src);
75 : :
76 [ + + ][ + - ]: 6 : if (wpa_s->off_channel_freq != wpa_s->pending_action_freq &&
77 [ + - ]: 2 : wpa_s->pending_action_freq != 0 &&
78 : 2 : wpa_s->pending_action_freq != iface->assoc_freq) {
79 : 2 : wpa_printf(MSG_DEBUG, "Off-channel: Pending Action frame TX "
80 : : "waiting for another freq=%u (off_channel_freq=%u "
81 : : "assoc_freq=%u)",
82 : : wpa_s->pending_action_freq,
83 : : wpa_s->off_channel_freq,
84 : : iface->assoc_freq);
85 [ - + ][ # # ]: 2 : if (without_roc && wpa_s->off_channel_freq == 0) {
86 : : /*
87 : : * We may get here if wpas_send_action() found us to be
88 : : * on the correct channel, but remain-on-channel cancel
89 : : * event was received before getting here.
90 : : */
91 : 0 : wpa_printf(MSG_DEBUG, "Off-channel: Schedule "
92 : : "remain-on-channel to send Action frame");
93 [ # # ]: 0 : if (wpa_drv_remain_on_channel(
94 : : wpa_s, wpa_s->pending_action_freq, 200) <
95 : : 0) {
96 : 0 : wpa_printf(MSG_DEBUG, "Off-channel: Failed to "
97 : : "request driver to remain on "
98 : : "channel (%u MHz) for Action Frame "
99 : : "TX", wpa_s->pending_action_freq);
100 : : } else {
101 : 0 : wpa_s->off_channel_freq = 0;
102 : 0 : wpa_s->roc_waiting_drv_freq =
103 : 0 : wpa_s->pending_action_freq;
104 : : }
105 : : }
106 : 2 : return;
107 : : }
108 : :
109 : 4 : wpa_printf(MSG_DEBUG, "Off-channel: Sending pending Action frame to "
110 : : MACSTR " using interface %s",
111 : 24 : MAC2STR(wpa_s->pending_action_dst), iface->ifname);
112 : 8 : res = wpa_drv_send_action(iface, wpa_s->pending_action_freq, 0,
113 : 4 : wpa_s->pending_action_dst,
114 : 4 : wpa_s->pending_action_src,
115 : 4 : wpa_s->pending_action_bssid,
116 : 4 : wpabuf_head(wpa_s->pending_action_tx),
117 : 4 : wpabuf_len(wpa_s->pending_action_tx),
118 : : wpa_s->pending_action_no_cck);
119 [ - + ]: 4 : if (res) {
120 : 0 : wpa_printf(MSG_DEBUG, "Off-channel: Failed to send the "
121 : : "pending Action frame");
122 : : /*
123 : : * Use fake TX status event to allow state machines to
124 : : * continue.
125 : : */
126 : 777 : offchannel_send_action_tx_status(
127 : 0 : wpa_s, wpa_s->pending_action_dst,
128 : 0 : wpabuf_head(wpa_s->pending_action_tx),
129 : 0 : wpabuf_len(wpa_s->pending_action_tx),
130 : : OFFCHANNEL_SEND_ACTION_FAILED);
131 : : }
132 : : }
133 : :
134 : :
135 : : /**
136 : : * offchannel_send_action_tx_status - TX status callback
137 : : * @wpa_s: Pointer to wpa_supplicant data
138 : : * @dst: Destination MAC address of the transmitted Action frame
139 : : * @data: Transmitted frame payload
140 : : * @data_len: Length of @data in bytes
141 : : * @result: TX status
142 : : *
143 : : * This function is called whenever the driver indicates a TX status event for
144 : : * a frame sent by offchannel_send_action() using wpa_drv_send_action().
145 : : */
146 : 890 : void offchannel_send_action_tx_status(
147 : : struct wpa_supplicant *wpa_s, const u8 *dst, const u8 *data,
148 : : size_t data_len, enum offchannel_send_action_result result)
149 : : {
150 [ + + ]: 890 : if (wpa_s->pending_action_tx == NULL) {
151 : 19 : wpa_printf(MSG_DEBUG, "Off-channel: Ignore Action TX status - "
152 : : "no pending operation");
153 : 19 : return;
154 : : }
155 : :
156 [ - + ]: 871 : if (os_memcmp(dst, wpa_s->pending_action_dst, ETH_ALEN) != 0) {
157 : 0 : wpa_printf(MSG_DEBUG, "Off-channel: Ignore Action TX status - "
158 : : "unknown destination address");
159 : 0 : return;
160 : : }
161 : :
162 : : /* Accept report only if the contents of the frame matches */
163 [ + + - + ]: 1741 : if (data_len - wpabuf_len(wpa_s->pending_action_tx) != 24 ||
164 : 870 : os_memcmp(data + 24, wpabuf_head(wpa_s->pending_action_tx),
165 : : wpabuf_len(wpa_s->pending_action_tx)) != 0) {
166 : 1 : wpa_printf(MSG_DEBUG, "Off-channel: Ignore Action TX status - "
167 : : "mismatching contents with pending frame");
168 : 1 : wpa_hexdump(MSG_MSGDUMP, "TX status frame data",
169 : : data, data_len);
170 : 1 : wpa_hexdump_buf(MSG_MSGDUMP, "Pending TX frame",
171 : 1 : wpa_s->pending_action_tx);
172 : 1 : return;
173 : : }
174 : :
175 : 870 : wpa_printf(MSG_DEBUG, "Off-channel: Delete matching pending action frame");
176 : :
177 : 870 : wpabuf_free(wpa_s->pending_action_tx);
178 : 870 : wpa_s->pending_action_tx = NULL;
179 : :
180 : 870 : wpa_printf(MSG_DEBUG, "Off-channel: TX status result=%d cb=%p",
181 : : result, wpa_s->pending_action_tx_status_cb);
182 : :
183 [ + - ]: 870 : if (wpa_s->pending_action_tx_status_cb) {
184 : 890 : wpa_s->pending_action_tx_status_cb(
185 : : wpa_s, wpa_s->pending_action_freq,
186 : 870 : wpa_s->pending_action_dst, wpa_s->pending_action_src,
187 : 870 : wpa_s->pending_action_bssid,
188 : : data, data_len, result);
189 : : }
190 : : }
191 : :
192 : :
193 : : /**
194 : : * offchannel_send_action - Request off-channel Action frame TX
195 : : * @wpa_s: Pointer to wpa_supplicant data
196 : : * @freq: The frequency in MHz indicating the channel on which the frame is to
197 : : * transmitted or 0 for the current channel (only if associated)
198 : : * @dst: Action frame destination MAC address
199 : : * @src: Action frame source MAC address
200 : : * @bssid: Action frame BSSID
201 : : * @buf: Frame to transmit starting from the Category field
202 : : * @len: Length of @buf in bytes
203 : : * @wait_time: Wait time for response in milliseconds
204 : : * @tx_cb: Callback function for indicating TX status or %NULL for now callback
205 : : * @no_cck: Whether CCK rates are to be disallowed for TX rate selection
206 : : * Returns: 0 on success or -1 on failure
207 : : *
208 : : * This function is used to request an Action frame to be transmitted on the
209 : : * current operating channel or on another channel (off-channel). The actual
210 : : * frame transmission will be delayed until the driver is ready on the specified
211 : : * channel. The @wait_time parameter can be used to request the driver to remain
212 : : * awake on the channel to wait for a response.
213 : : */
214 : 872 : int offchannel_send_action(struct wpa_supplicant *wpa_s, unsigned int freq,
215 : : const u8 *dst, const u8 *src, const u8 *bssid,
216 : : const u8 *buf, size_t len, unsigned int wait_time,
217 : : void (*tx_cb)(struct wpa_supplicant *wpa_s,
218 : : unsigned int freq, const u8 *dst,
219 : : const u8 *src, const u8 *bssid,
220 : : const u8 *data, size_t data_len,
221 : : enum offchannel_send_action_result
222 : : result),
223 : : int no_cck)
224 : : {
225 : 872 : wpa_printf(MSG_DEBUG, "Off-channel: Send action frame: freq=%d dst="
226 : : MACSTR " src=" MACSTR " bssid=" MACSTR " len=%d",
227 : 15696 : freq, MAC2STR(dst), MAC2STR(src), MAC2STR(bssid),
228 : : (int) len);
229 : :
230 : 872 : wpa_s->pending_action_tx_status_cb = tx_cb;
231 : :
232 [ - + ]: 872 : if (wpa_s->pending_action_tx) {
233 : 0 : wpa_printf(MSG_DEBUG, "Off-channel: Dropped pending Action "
234 : : "frame TX to " MACSTR,
235 : 0 : MAC2STR(wpa_s->pending_action_dst));
236 : 0 : wpabuf_free(wpa_s->pending_action_tx);
237 : : }
238 : 872 : wpa_s->pending_action_tx = wpabuf_alloc(len);
239 [ - + ]: 872 : if (wpa_s->pending_action_tx == NULL) {
240 : 0 : wpa_printf(MSG_DEBUG, "Off-channel: Failed to allocate Action "
241 : : "frame TX buffer (len=%llu)",
242 : : (unsigned long long) len);
243 : 0 : return -1;
244 : : }
245 : 872 : wpabuf_put_data(wpa_s->pending_action_tx, buf, len);
246 : 872 : os_memcpy(wpa_s->pending_action_src, src, ETH_ALEN);
247 : 872 : os_memcpy(wpa_s->pending_action_dst, dst, ETH_ALEN);
248 : 872 : os_memcpy(wpa_s->pending_action_bssid, bssid, ETH_ALEN);
249 : 872 : wpa_s->pending_action_freq = freq;
250 : 872 : wpa_s->pending_action_no_cck = no_cck;
251 : :
252 [ + - ][ + + ]: 872 : if (freq != 0 && wpa_s->drv_flags & WPA_DRIVER_FLAGS_OFFCHANNEL_TX) {
253 : : struct wpa_supplicant *iface;
254 : :
255 : 868 : iface = wpas_get_tx_interface(wpa_s,
256 : 868 : wpa_s->pending_action_src);
257 : 868 : wpa_s->action_tx_wait_time = wait_time;
258 : :
259 : 1736 : return wpa_drv_send_action(
260 : : iface, wpa_s->pending_action_freq,
261 : 868 : wait_time, wpa_s->pending_action_dst,
262 : 868 : wpa_s->pending_action_src, wpa_s->pending_action_bssid,
263 : 868 : wpabuf_head(wpa_s->pending_action_tx),
264 : 868 : wpabuf_len(wpa_s->pending_action_tx),
265 : : wpa_s->pending_action_no_cck);
266 : : }
267 : :
268 [ + - ]: 4 : if (freq) {
269 : : struct wpa_supplicant *tx_iface;
270 : 4 : tx_iface = wpas_get_tx_interface(wpa_s, src);
271 [ - + ]: 4 : if (tx_iface->assoc_freq == freq) {
272 : 0 : wpa_printf(MSG_DEBUG, "Off-channel: Already on "
273 : : "requested channel (TX interface operating "
274 : : "channel)");
275 : 0 : freq = 0;
276 : : }
277 : : }
278 : :
279 [ + + ][ - + ]: 4 : if (wpa_s->off_channel_freq == freq || freq == 0) {
280 : 2 : wpa_printf(MSG_DEBUG, "Off-channel: Already on requested "
281 : : "channel; send Action frame immediately");
282 : : /* TODO: Would there ever be need to extend the current
283 : : * duration on the channel? */
284 : 2 : wpa_s->pending_action_without_roc = 1;
285 : 2 : eloop_cancel_timeout(wpas_send_action_cb, wpa_s, NULL);
286 : 2 : eloop_register_timeout(0, 0, wpas_send_action_cb, wpa_s, NULL);
287 : 2 : return 0;
288 : : }
289 : 2 : wpa_s->pending_action_without_roc = 0;
290 : :
291 [ - + ]: 2 : if (wpa_s->roc_waiting_drv_freq == freq) {
292 : 0 : wpa_printf(MSG_DEBUG, "Off-channel: Already waiting for "
293 : : "driver to get to frequency %u MHz; continue "
294 : : "waiting to send the Action frame", freq);
295 : 0 : return 0;
296 : : }
297 : :
298 : 2 : wpa_printf(MSG_DEBUG, "Off-channel: Schedule Action frame to be "
299 : : "transmitted once the driver gets to the requested "
300 : : "channel");
301 [ - + ]: 2 : if (wait_time > wpa_s->max_remain_on_chan)
302 : 0 : wait_time = wpa_s->max_remain_on_chan;
303 [ - + ]: 2 : else if (wait_time == 0)
304 : 0 : wait_time = 20;
305 [ - + ]: 2 : if (wpa_drv_remain_on_channel(wpa_s, freq, wait_time) < 0) {
306 : 0 : wpa_printf(MSG_DEBUG, "Off-channel: Failed to request driver "
307 : : "to remain on channel (%u MHz) for Action "
308 : : "Frame TX", freq);
309 : 0 : return -1;
310 : : }
311 : 2 : wpa_s->off_channel_freq = 0;
312 : 2 : wpa_s->roc_waiting_drv_freq = freq;
313 : :
314 : 872 : return 0;
315 : : }
316 : :
317 : :
318 : : /**
319 : : * offchannel_send_send_action_done - Notify completion of Action frame sequence
320 : : * @wpa_s: Pointer to wpa_supplicant data
321 : : *
322 : : * This function can be used to cancel a wait for additional response frames on
323 : : * the channel that was used with offchannel_send_action().
324 : : */
325 : 466 : void offchannel_send_action_done(struct wpa_supplicant *wpa_s)
326 : : {
327 : 466 : wpa_printf(MSG_DEBUG, "Off-channel: Action frame sequence done "
328 : : "notification");
329 : 466 : wpabuf_free(wpa_s->pending_action_tx);
330 : 466 : wpa_s->pending_action_tx = NULL;
331 [ + + ][ + - ]: 466 : if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_OFFCHANNEL_TX &&
332 : 463 : wpa_s->action_tx_wait_time)
333 : 463 : wpa_drv_send_action_cancel_wait(wpa_s);
334 : :
335 [ + + ][ - + ]: 466 : if (wpa_s->off_channel_freq || wpa_s->roc_waiting_drv_freq) {
336 : 65 : wpa_drv_cancel_remain_on_channel(wpa_s);
337 : 65 : wpa_s->off_channel_freq = 0;
338 : 65 : wpa_s->roc_waiting_drv_freq = 0;
339 : : }
340 : 466 : }
341 : :
342 : :
343 : : /**
344 : : * offchannel_remain_on_channel_cb - Remain-on-channel callback function
345 : : * @wpa_s: Pointer to wpa_supplicant data
346 : : * @freq: Frequency (in MHz) of the selected channel
347 : : * @duration: Duration of the remain-on-channel operation in milliseconds
348 : : *
349 : : * This function is called whenever the driver notifies beginning of a
350 : : * remain-on-channel operation.
351 : : */
352 : 775 : void offchannel_remain_on_channel_cb(struct wpa_supplicant *wpa_s,
353 : : unsigned int freq, unsigned int duration)
354 : : {
355 : 775 : wpa_s->roc_waiting_drv_freq = 0;
356 : 775 : wpa_s->off_channel_freq = freq;
357 : 775 : wpas_send_action_cb(wpa_s, NULL);
358 : 775 : }
359 : :
360 : :
361 : : /**
362 : : * offchannel_cancel_remain_on_channel_cb - Remain-on-channel stopped callback
363 : : * @wpa_s: Pointer to wpa_supplicant data
364 : : * @freq: Frequency (in MHz) of the selected channel
365 : : *
366 : : * This function is called whenever the driver notifies termination of a
367 : : * remain-on-channel operation.
368 : : */
369 : 769 : void offchannel_cancel_remain_on_channel_cb(struct wpa_supplicant *wpa_s,
370 : : unsigned int freq)
371 : : {
372 : 769 : wpa_s->off_channel_freq = 0;
373 : 769 : }
374 : :
375 : :
376 : : /**
377 : : * offchannel_pending_action_tx - Check whether there is a pending Action TX
378 : : * @wpa_s: Pointer to wpa_supplicant data
379 : : * Returns: Pointer to pending frame or %NULL if no pending operation
380 : : *
381 : : * This function can be used to check whether there is a pending Action frame TX
382 : : * operation. The returned pointer should be used only for checking whether it
383 : : * is %NULL (no pending frame) or to print the pointer value in debug
384 : : * information (i.e., the pointer should not be dereferenced).
385 : : */
386 : 3084 : const void * offchannel_pending_action_tx(struct wpa_supplicant *wpa_s)
387 : : {
388 : 3084 : return wpa_s->pending_action_tx;
389 : : }
390 : :
391 : :
392 : : /**
393 : : * offchannel_clear_pending_action_tx - Clear pending Action frame TX
394 : : * @wpa_s: Pointer to wpa_supplicant data
395 : : */
396 : 40 : void offchannel_clear_pending_action_tx(struct wpa_supplicant *wpa_s)
397 : : {
398 : 40 : wpabuf_free(wpa_s->pending_action_tx);
399 : 40 : wpa_s->pending_action_tx = NULL;
400 : 40 : }
401 : :
402 : :
403 : : /**
404 : : * offchannel_deinit - Deinit off-channel operations
405 : : * @wpa_s: Pointer to wpa_supplicant data
406 : : *
407 : : * This function is used to free up any allocated resources for off-channel
408 : : * operations.
409 : : */
410 : 40 : void offchannel_deinit(struct wpa_supplicant *wpa_s)
411 : : {
412 : 40 : offchannel_clear_pending_action_tx(wpa_s);
413 : 40 : eloop_cancel_timeout(wpas_send_action_cb, wpa_s, NULL);
414 : 40 : }
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