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Commit | Line | Data |
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83922c2d JM |
1 | /* |
2 | * BSS table | |
1d747e2a | 3 | * Copyright (c) 2009-2015, Jouni Malinen <j@w1.fi> |
83922c2d | 4 | * |
0f3d578e JM |
5 | * This software may be distributed under the terms of the BSD license. |
6 | * See README for more details. | |
83922c2d JM |
7 | */ |
8 | ||
9 | #include "utils/includes.h" | |
10 | ||
11 | #include "utils/common.h" | |
12 | #include "utils/eloop.h" | |
13 | #include "common/ieee802_11_defs.h" | |
14 | #include "drivers/driver.h" | |
15 | #include "wpa_supplicant_i.h" | |
c9c38b09 | 16 | #include "config.h" |
83922c2d | 17 | #include "notify.h" |
d1f9c410 | 18 | #include "scan.h" |
83922c2d JM |
19 | #include "bss.h" |
20 | ||
21 | ||
158c6c74 WS |
22 | #define WPA_BSS_FREQ_CHANGED_FLAG BIT(0) |
23 | #define WPA_BSS_SIGNAL_CHANGED_FLAG BIT(1) | |
24 | #define WPA_BSS_PRIVACY_CHANGED_FLAG BIT(2) | |
25 | #define WPA_BSS_MODE_CHANGED_FLAG BIT(3) | |
26 | #define WPA_BSS_WPAIE_CHANGED_FLAG BIT(4) | |
27 | #define WPA_BSS_RSNIE_CHANGED_FLAG BIT(5) | |
28 | #define WPA_BSS_WPS_CHANGED_FLAG BIT(6) | |
29 | #define WPA_BSS_RATES_CHANGED_FLAG BIT(7) | |
7899e2f4 | 30 | #define WPA_BSS_IES_CHANGED_FLAG BIT(8) |
158c6c74 | 31 | |
83922c2d | 32 | |
c739d7e9 JM |
33 | static void wpa_bss_set_hessid(struct wpa_bss *bss) |
34 | { | |
35 | #ifdef CONFIG_INTERWORKING | |
36 | const u8 *ie = wpa_bss_get_ie(bss, WLAN_EID_INTERWORKING); | |
37 | if (ie == NULL || (ie[1] != 7 && ie[1] != 9)) { | |
38 | os_memset(bss->hessid, 0, ETH_ALEN); | |
39 | return; | |
40 | } | |
41 | if (ie[1] == 7) | |
42 | os_memcpy(bss->hessid, ie + 3, ETH_ALEN); | |
43 | else | |
44 | os_memcpy(bss->hessid, ie + 5, ETH_ALEN); | |
45 | #endif /* CONFIG_INTERWORKING */ | |
46 | } | |
47 | ||
48 | ||
2c09af30 JM |
49 | /** |
50 | * wpa_bss_anqp_alloc - Allocate ANQP data structure for a BSS entry | |
51 | * Returns: Allocated ANQP data structure or %NULL on failure | |
52 | * | |
53 | * The allocated ANQP data structure has its users count set to 1. It may be | |
54 | * shared by multiple BSS entries and each shared entry is freed with | |
55 | * wpa_bss_anqp_free(). | |
56 | */ | |
476aed35 JM |
57 | struct wpa_bss_anqp * wpa_bss_anqp_alloc(void) |
58 | { | |
59 | struct wpa_bss_anqp *anqp; | |
60 | anqp = os_zalloc(sizeof(*anqp)); | |
61 | if (anqp == NULL) | |
62 | return NULL; | |
8c4a1026 JM |
63 | #ifdef CONFIG_INTERWORKING |
64 | dl_list_init(&anqp->anqp_elems); | |
65 | #endif /* CONFIG_INTERWORKING */ | |
476aed35 JM |
66 | anqp->users = 1; |
67 | return anqp; | |
68 | } | |
69 | ||
70 | ||
2c09af30 JM |
71 | /** |
72 | * wpa_bss_anqp_clone - Clone an ANQP data structure | |
73 | * @anqp: ANQP data structure from wpa_bss_anqp_alloc() | |
74 | * Returns: Cloned ANQP data structure or %NULL on failure | |
75 | */ | |
485e3a92 JM |
76 | static struct wpa_bss_anqp * wpa_bss_anqp_clone(struct wpa_bss_anqp *anqp) |
77 | { | |
78 | struct wpa_bss_anqp *n; | |
79 | ||
80 | n = os_zalloc(sizeof(*n)); | |
81 | if (n == NULL) | |
82 | return NULL; | |
83 | ||
84 | #define ANQP_DUP(f) if (anqp->f) n->f = wpabuf_dup(anqp->f) | |
85 | #ifdef CONFIG_INTERWORKING | |
8c4a1026 | 86 | dl_list_init(&n->anqp_elems); |
5ce6ac11 | 87 | ANQP_DUP(capability_list); |
485e3a92 JM |
88 | ANQP_DUP(venue_name); |
89 | ANQP_DUP(network_auth_type); | |
90 | ANQP_DUP(roaming_consortium); | |
91 | ANQP_DUP(ip_addr_type_availability); | |
92 | ANQP_DUP(nai_realm); | |
93 | ANQP_DUP(anqp_3gpp); | |
94 | ANQP_DUP(domain_name); | |
95 | #endif /* CONFIG_INTERWORKING */ | |
96 | #ifdef CONFIG_HS20 | |
185ada47 | 97 | ANQP_DUP(hs20_capability_list); |
485e3a92 JM |
98 | ANQP_DUP(hs20_operator_friendly_name); |
99 | ANQP_DUP(hs20_wan_metrics); | |
100 | ANQP_DUP(hs20_connection_capability); | |
101 | ANQP_DUP(hs20_operating_class); | |
1d2215fc | 102 | ANQP_DUP(hs20_osu_providers_list); |
485e3a92 JM |
103 | #endif /* CONFIG_HS20 */ |
104 | #undef ANQP_DUP | |
105 | ||
106 | return n; | |
107 | } | |
108 | ||
109 | ||
2c09af30 JM |
110 | /** |
111 | * wpa_bss_anqp_unshare_alloc - Unshare ANQP data (if shared) in a BSS entry | |
112 | * @bss: BSS entry | |
113 | * Returns: 0 on success, -1 on failure | |
114 | * | |
115 | * This function ensures the specific BSS entry has an ANQP data structure that | |
116 | * is not shared with any other BSS entry. | |
117 | */ | |
485e3a92 JM |
118 | int wpa_bss_anqp_unshare_alloc(struct wpa_bss *bss) |
119 | { | |
120 | struct wpa_bss_anqp *anqp; | |
121 | ||
122 | if (bss->anqp && bss->anqp->users > 1) { | |
123 | /* allocated, but shared - clone an unshared copy */ | |
124 | anqp = wpa_bss_anqp_clone(bss->anqp); | |
125 | if (anqp == NULL) | |
126 | return -1; | |
127 | anqp->users = 1; | |
128 | bss->anqp->users--; | |
129 | bss->anqp = anqp; | |
130 | return 0; | |
131 | } | |
132 | ||
133 | if (bss->anqp) | |
134 | return 0; /* already allocated and not shared */ | |
135 | ||
136 | /* not allocated - allocate a new storage area */ | |
137 | bss->anqp = wpa_bss_anqp_alloc(); | |
138 | return bss->anqp ? 0 : -1; | |
139 | } | |
140 | ||
141 | ||
2c09af30 JM |
142 | /** |
143 | * wpa_bss_anqp_free - Free an ANQP data structure | |
144 | * @anqp: ANQP data structure from wpa_bss_anqp_alloc() or wpa_bss_anqp_clone() | |
145 | */ | |
476aed35 JM |
146 | static void wpa_bss_anqp_free(struct wpa_bss_anqp *anqp) |
147 | { | |
8c4a1026 JM |
148 | #ifdef CONFIG_INTERWORKING |
149 | struct wpa_bss_anqp_elem *elem; | |
150 | #endif /* CONFIG_INTERWORKING */ | |
151 | ||
476aed35 JM |
152 | if (anqp == NULL) |
153 | return; | |
154 | ||
155 | anqp->users--; | |
156 | if (anqp->users > 0) { | |
157 | /* Another BSS entry holds a pointer to this ANQP info */ | |
158 | return; | |
159 | } | |
160 | ||
161 | #ifdef CONFIG_INTERWORKING | |
5ce6ac11 | 162 | wpabuf_free(anqp->capability_list); |
476aed35 JM |
163 | wpabuf_free(anqp->venue_name); |
164 | wpabuf_free(anqp->network_auth_type); | |
165 | wpabuf_free(anqp->roaming_consortium); | |
166 | wpabuf_free(anqp->ip_addr_type_availability); | |
167 | wpabuf_free(anqp->nai_realm); | |
168 | wpabuf_free(anqp->anqp_3gpp); | |
169 | wpabuf_free(anqp->domain_name); | |
8c4a1026 JM |
170 | |
171 | while ((elem = dl_list_first(&anqp->anqp_elems, | |
172 | struct wpa_bss_anqp_elem, list))) { | |
173 | dl_list_del(&elem->list); | |
174 | wpabuf_free(elem->payload); | |
175 | os_free(elem); | |
176 | } | |
476aed35 JM |
177 | #endif /* CONFIG_INTERWORKING */ |
178 | #ifdef CONFIG_HS20 | |
185ada47 | 179 | wpabuf_free(anqp->hs20_capability_list); |
476aed35 JM |
180 | wpabuf_free(anqp->hs20_operator_friendly_name); |
181 | wpabuf_free(anqp->hs20_wan_metrics); | |
182 | wpabuf_free(anqp->hs20_connection_capability); | |
183 | wpabuf_free(anqp->hs20_operating_class); | |
1d2215fc | 184 | wpabuf_free(anqp->hs20_osu_providers_list); |
476aed35 JM |
185 | #endif /* CONFIG_HS20 */ |
186 | ||
187 | os_free(anqp); | |
188 | } | |
189 | ||
190 | ||
a7f5271d JM |
191 | static void wpa_bss_update_pending_connect(struct wpa_supplicant *wpa_s, |
192 | struct wpa_bss *old_bss, | |
193 | struct wpa_bss *new_bss) | |
194 | { | |
195 | struct wpa_radio_work *work; | |
196 | struct wpa_connect_work *cwork; | |
197 | ||
198 | work = radio_work_pending(wpa_s, "sme-connect"); | |
199 | if (!work) | |
200 | work = radio_work_pending(wpa_s, "connect"); | |
201 | if (!work) | |
202 | return; | |
203 | ||
204 | cwork = work->ctx; | |
205 | if (cwork->bss != old_bss) | |
206 | return; | |
207 | ||
208 | wpa_printf(MSG_DEBUG, | |
209 | "Update BSS pointer for the pending connect radio work"); | |
210 | cwork->bss = new_bss; | |
211 | if (!new_bss) | |
212 | cwork->bss_removed = 1; | |
213 | } | |
214 | ||
215 | ||
a6b71f72 PS |
216 | static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss, |
217 | const char *reason) | |
83922c2d | 218 | { |
a297201d JM |
219 | if (wpa_s->last_scan_res) { |
220 | unsigned int i; | |
221 | for (i = 0; i < wpa_s->last_scan_res_used; i++) { | |
222 | if (wpa_s->last_scan_res[i] == bss) { | |
223 | os_memmove(&wpa_s->last_scan_res[i], | |
224 | &wpa_s->last_scan_res[i + 1], | |
225 | (wpa_s->last_scan_res_used - i - 1) | |
226 | * sizeof(struct wpa_bss *)); | |
227 | wpa_s->last_scan_res_used--; | |
228 | break; | |
229 | } | |
230 | } | |
231 | } | |
a7f5271d | 232 | wpa_bss_update_pending_connect(wpa_s, bss, NULL); |
83922c2d | 233 | dl_list_del(&bss->list); |
d4bf8f13 | 234 | dl_list_del(&bss->list_id); |
83922c2d | 235 | wpa_s->num_bss--; |
f049052b | 236 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR |
a6b71f72 PS |
237 | " SSID '%s' due to %s", bss->id, MAC2STR(bss->bssid), |
238 | wpa_ssid_txt(bss->ssid, bss->ssid_len), reason); | |
f0d126d3 | 239 | wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id); |
476aed35 | 240 | wpa_bss_anqp_free(bss->anqp); |
83922c2d JM |
241 | os_free(bss); |
242 | } | |
243 | ||
244 | ||
2c09af30 JM |
245 | /** |
246 | * wpa_bss_get - Fetch a BSS table entry based on BSSID and SSID | |
247 | * @wpa_s: Pointer to wpa_supplicant data | |
248 | * @bssid: BSSID | |
249 | * @ssid: SSID | |
250 | * @ssid_len: Length of @ssid | |
251 | * Returns: Pointer to the BSS entry or %NULL if not found | |
252 | */ | |
59f2caa9 JM |
253 | struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid, |
254 | const u8 *ssid, size_t ssid_len) | |
83922c2d JM |
255 | { |
256 | struct wpa_bss *bss; | |
d445a5cd JM |
257 | if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid)) |
258 | return NULL; | |
83922c2d JM |
259 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { |
260 | if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0 && | |
261 | bss->ssid_len == ssid_len && | |
262 | os_memcmp(bss->ssid, ssid, ssid_len) == 0) | |
263 | return bss; | |
264 | } | |
265 | return NULL; | |
266 | } | |
267 | ||
268 | ||
acb69cec | 269 | static void calculate_update_time(const struct os_reltime *fetch_time, |
4342326f | 270 | unsigned int age_ms, |
acb69cec | 271 | struct os_reltime *update_time) |
83922c2d JM |
272 | { |
273 | os_time_t usec; | |
274 | ||
4342326f JM |
275 | update_time->sec = fetch_time->sec; |
276 | update_time->usec = fetch_time->usec; | |
277 | update_time->sec -= age_ms / 1000; | |
278 | usec = (age_ms % 1000) * 1000; | |
279 | if (update_time->usec < usec) { | |
280 | update_time->sec--; | |
281 | update_time->usec += 1000000; | |
282 | } | |
283 | update_time->usec -= usec; | |
284 | } | |
285 | ||
286 | ||
287 | static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src, | |
acb69cec | 288 | struct os_reltime *fetch_time) |
4342326f | 289 | { |
83922c2d JM |
290 | dst->flags = src->flags; |
291 | os_memcpy(dst->bssid, src->bssid, ETH_ALEN); | |
292 | dst->freq = src->freq; | |
293 | dst->beacon_int = src->beacon_int; | |
294 | dst->caps = src->caps; | |
295 | dst->qual = src->qual; | |
296 | dst->noise = src->noise; | |
297 | dst->level = src->level; | |
298 | dst->tsf = src->tsf; | |
1d747e2a JM |
299 | dst->est_throughput = src->est_throughput; |
300 | dst->snr = src->snr; | |
83922c2d | 301 | |
4342326f | 302 | calculate_update_time(fetch_time, src->age, &dst->last_update); |
83922c2d JM |
303 | } |
304 | ||
305 | ||
018a309a JM |
306 | static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss) |
307 | { | |
308 | struct wpa_ssid *ssid; | |
309 | ||
310 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { | |
311 | if (ssid->ssid == NULL || ssid->ssid_len == 0) | |
312 | continue; | |
313 | if (ssid->ssid_len == bss->ssid_len && | |
314 | os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0) | |
315 | return 1; | |
316 | } | |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
321 | ||
a6b71f72 PS |
322 | static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss) |
323 | { | |
3008d0a6 JG |
324 | if (bss == wpa_s->current_bss) |
325 | return 1; | |
326 | ||
327 | if (wpa_s->current_bss && | |
328 | (bss->ssid_len != wpa_s->current_bss->ssid_len || | |
329 | os_memcmp(bss->ssid, wpa_s->current_bss->ssid, | |
330 | bss->ssid_len) != 0)) | |
331 | return 0; /* SSID has changed */ | |
332 | ||
333 | return !is_zero_ether_addr(bss->bssid) && | |
334 | (os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 || | |
335 | os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0); | |
a6b71f72 PS |
336 | } |
337 | ||
338 | ||
018a309a JM |
339 | static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s) |
340 | { | |
341 | struct wpa_bss *bss; | |
342 | ||
343 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { | |
344 | if (!wpa_bss_known(wpa_s, bss)) { | |
a6b71f72 | 345 | wpa_bss_remove(wpa_s, bss, __func__); |
018a309a JM |
346 | return 0; |
347 | } | |
348 | } | |
349 | ||
350 | return -1; | |
351 | } | |
352 | ||
353 | ||
a6b71f72 | 354 | static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s) |
018a309a | 355 | { |
a6b71f72 PS |
356 | struct wpa_bss *bss; |
357 | ||
018a309a JM |
358 | /* |
359 | * Remove the oldest entry that does not match with any configured | |
360 | * network. | |
361 | */ | |
362 | if (wpa_bss_remove_oldest_unknown(wpa_s) == 0) | |
a6b71f72 | 363 | return 0; |
018a309a JM |
364 | |
365 | /* | |
a6b71f72 | 366 | * Remove the oldest entry that isn't currently in use. |
018a309a | 367 | */ |
a6b71f72 PS |
368 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { |
369 | if (!wpa_bss_in_use(wpa_s, bss)) { | |
370 | wpa_bss_remove(wpa_s, bss, __func__); | |
371 | return 0; | |
372 | } | |
373 | } | |
374 | ||
375 | return -1; | |
018a309a JM |
376 | } |
377 | ||
378 | ||
a297201d JM |
379 | static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s, |
380 | const u8 *ssid, size_t ssid_len, | |
c5f10e80 | 381 | struct wpa_scan_res *res, |
acb69cec | 382 | struct os_reltime *fetch_time) |
83922c2d JM |
383 | { |
384 | struct wpa_bss *bss; | |
385 | ||
8c090654 | 386 | bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len); |
83922c2d | 387 | if (bss == NULL) |
a297201d | 388 | return NULL; |
83922c2d JM |
389 | bss->id = wpa_s->bss_next_id++; |
390 | bss->last_update_idx = wpa_s->bss_update_idx; | |
c5f10e80 | 391 | wpa_bss_copy_res(bss, res, fetch_time); |
83922c2d JM |
392 | os_memcpy(bss->ssid, ssid, ssid_len); |
393 | bss->ssid_len = ssid_len; | |
394 | bss->ie_len = res->ie_len; | |
8c090654 JM |
395 | bss->beacon_ie_len = res->beacon_ie_len; |
396 | os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len); | |
c739d7e9 | 397 | wpa_bss_set_hessid(bss); |
83922c2d | 398 | |
a3cbf82e JM |
399 | if (wpa_s->num_bss + 1 > wpa_s->conf->bss_max_count && |
400 | wpa_bss_remove_oldest(wpa_s) != 0) { | |
401 | wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d " | |
402 | "because all BSSes are in use. We should normally " | |
403 | "not get here!", (int) wpa_s->num_bss + 1); | |
404 | wpa_s->conf->bss_max_count = wpa_s->num_bss + 1; | |
405 | } | |
406 | ||
83922c2d | 407 | dl_list_add_tail(&wpa_s->bss, &bss->list); |
d4bf8f13 | 408 | dl_list_add_tail(&wpa_s->bss_id, &bss->list_id); |
83922c2d | 409 | wpa_s->num_bss++; |
f049052b | 410 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR |
dcc8bc82 JM |
411 | " SSID '%s' freq %d", |
412 | bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len), | |
413 | bss->freq); | |
f0d126d3 | 414 | wpas_notify_bss_added(wpa_s, bss->bssid, bss->id); |
a297201d | 415 | return bss; |
83922c2d JM |
416 | } |
417 | ||
418 | ||
158c6c74 | 419 | static int are_ies_equal(const struct wpa_bss *old, |
a6da824b | 420 | const struct wpa_scan_res *new_res, u32 ie) |
158c6c74 WS |
421 | { |
422 | const u8 *old_ie, *new_ie; | |
423 | struct wpabuf *old_ie_buff = NULL; | |
424 | struct wpabuf *new_ie_buff = NULL; | |
425 | int new_ie_len, old_ie_len, ret, is_multi; | |
426 | ||
427 | switch (ie) { | |
428 | case WPA_IE_VENDOR_TYPE: | |
429 | old_ie = wpa_bss_get_vendor_ie(old, ie); | |
a6da824b | 430 | new_ie = wpa_scan_get_vendor_ie(new_res, ie); |
158c6c74 WS |
431 | is_multi = 0; |
432 | break; | |
433 | case WPS_IE_VENDOR_TYPE: | |
434 | old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie); | |
a6da824b | 435 | new_ie_buff = wpa_scan_get_vendor_ie_multi(new_res, ie); |
158c6c74 WS |
436 | is_multi = 1; |
437 | break; | |
438 | case WLAN_EID_RSN: | |
439 | case WLAN_EID_SUPP_RATES: | |
440 | case WLAN_EID_EXT_SUPP_RATES: | |
441 | old_ie = wpa_bss_get_ie(old, ie); | |
a6da824b | 442 | new_ie = wpa_scan_get_ie(new_res, ie); |
158c6c74 WS |
443 | is_multi = 0; |
444 | break; | |
445 | default: | |
446 | wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__); | |
447 | return 0; | |
448 | } | |
449 | ||
450 | if (is_multi) { | |
451 | /* in case of multiple IEs stored in buffer */ | |
452 | old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL; | |
453 | new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL; | |
454 | old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0; | |
455 | new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0; | |
456 | } else { | |
457 | /* in case of single IE */ | |
458 | old_ie_len = old_ie ? old_ie[1] + 2 : 0; | |
459 | new_ie_len = new_ie ? new_ie[1] + 2 : 0; | |
460 | } | |
461 | ||
f4fbba8c JM |
462 | if (!old_ie || !new_ie) |
463 | ret = !old_ie && !new_ie; | |
464 | else | |
465 | ret = (old_ie_len == new_ie_len && | |
466 | os_memcmp(old_ie, new_ie, old_ie_len) == 0); | |
158c6c74 WS |
467 | |
468 | wpabuf_free(old_ie_buff); | |
469 | wpabuf_free(new_ie_buff); | |
470 | ||
471 | return ret; | |
472 | } | |
473 | ||
474 | ||
475 | static u32 wpa_bss_compare_res(const struct wpa_bss *old, | |
a6da824b | 476 | const struct wpa_scan_res *new_res) |
158c6c74 WS |
477 | { |
478 | u32 changes = 0; | |
a6da824b | 479 | int caps_diff = old->caps ^ new_res->caps; |
158c6c74 | 480 | |
a6da824b | 481 | if (old->freq != new_res->freq) |
158c6c74 WS |
482 | changes |= WPA_BSS_FREQ_CHANGED_FLAG; |
483 | ||
a6da824b | 484 | if (old->level != new_res->level) |
158c6c74 WS |
485 | changes |= WPA_BSS_SIGNAL_CHANGED_FLAG; |
486 | ||
487 | if (caps_diff & IEEE80211_CAP_PRIVACY) | |
488 | changes |= WPA_BSS_PRIVACY_CHANGED_FLAG; | |
489 | ||
490 | if (caps_diff & IEEE80211_CAP_IBSS) | |
491 | changes |= WPA_BSS_MODE_CHANGED_FLAG; | |
492 | ||
a6da824b JM |
493 | if (old->ie_len == new_res->ie_len && |
494 | os_memcmp(old + 1, new_res + 1, old->ie_len) == 0) | |
7899e2f4 WS |
495 | return changes; |
496 | changes |= WPA_BSS_IES_CHANGED_FLAG; | |
497 | ||
a6da824b | 498 | if (!are_ies_equal(old, new_res, WPA_IE_VENDOR_TYPE)) |
158c6c74 WS |
499 | changes |= WPA_BSS_WPAIE_CHANGED_FLAG; |
500 | ||
a6da824b | 501 | if (!are_ies_equal(old, new_res, WLAN_EID_RSN)) |
158c6c74 WS |
502 | changes |= WPA_BSS_RSNIE_CHANGED_FLAG; |
503 | ||
a6da824b | 504 | if (!are_ies_equal(old, new_res, WPS_IE_VENDOR_TYPE)) |
158c6c74 WS |
505 | changes |= WPA_BSS_WPS_CHANGED_FLAG; |
506 | ||
a6da824b JM |
507 | if (!are_ies_equal(old, new_res, WLAN_EID_SUPP_RATES) || |
508 | !are_ies_equal(old, new_res, WLAN_EID_EXT_SUPP_RATES)) | |
158c6c74 WS |
509 | changes |= WPA_BSS_RATES_CHANGED_FLAG; |
510 | ||
511 | return changes; | |
512 | } | |
513 | ||
514 | ||
515 | static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes, | |
516 | const struct wpa_bss *bss) | |
517 | { | |
518 | if (changes & WPA_BSS_FREQ_CHANGED_FLAG) | |
519 | wpas_notify_bss_freq_changed(wpa_s, bss->id); | |
520 | ||
521 | if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG) | |
522 | wpas_notify_bss_signal_changed(wpa_s, bss->id); | |
523 | ||
524 | if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG) | |
525 | wpas_notify_bss_privacy_changed(wpa_s, bss->id); | |
526 | ||
527 | if (changes & WPA_BSS_MODE_CHANGED_FLAG) | |
528 | wpas_notify_bss_mode_changed(wpa_s, bss->id); | |
529 | ||
530 | if (changes & WPA_BSS_WPAIE_CHANGED_FLAG) | |
531 | wpas_notify_bss_wpaie_changed(wpa_s, bss->id); | |
532 | ||
533 | if (changes & WPA_BSS_RSNIE_CHANGED_FLAG) | |
534 | wpas_notify_bss_rsnie_changed(wpa_s, bss->id); | |
535 | ||
536 | if (changes & WPA_BSS_WPS_CHANGED_FLAG) | |
537 | wpas_notify_bss_wps_changed(wpa_s, bss->id); | |
538 | ||
7899e2f4 WS |
539 | if (changes & WPA_BSS_IES_CHANGED_FLAG) |
540 | wpas_notify_bss_ies_changed(wpa_s, bss->id); | |
541 | ||
158c6c74 WS |
542 | if (changes & WPA_BSS_RATES_CHANGED_FLAG) |
543 | wpas_notify_bss_rates_changed(wpa_s, bss->id); | |
3bd3257a DW |
544 | |
545 | wpas_notify_bss_seen(wpa_s, bss->id); | |
158c6c74 WS |
546 | } |
547 | ||
548 | ||
762b99db JM |
549 | static struct wpa_bss * |
550 | wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss, | |
acb69cec | 551 | struct wpa_scan_res *res, struct os_reltime *fetch_time) |
83922c2d | 552 | { |
158c6c74 WS |
553 | u32 changes; |
554 | ||
555 | changes = wpa_bss_compare_res(bss, res); | |
dcc8bc82 JM |
556 | if (changes & WPA_BSS_FREQ_CHANGED_FLAG) |
557 | wpa_printf(MSG_DEBUG, "BSS: " MACSTR " changed freq %d --> %d", | |
558 | MAC2STR(bss->bssid), bss->freq, res->freq); | |
83922c2d JM |
559 | bss->scan_miss_count = 0; |
560 | bss->last_update_idx = wpa_s->bss_update_idx; | |
c5f10e80 | 561 | wpa_bss_copy_res(bss, res, fetch_time); |
83922c2d JM |
562 | /* Move the entry to the end of the list */ |
563 | dl_list_del(&bss->list); | |
ff57398f JM |
564 | #ifdef CONFIG_P2P |
565 | if (wpa_bss_get_vendor_ie(bss, P2P_IE_VENDOR_TYPE) && | |
566 | !wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE)) { | |
567 | /* | |
568 | * This can happen when non-P2P station interface runs a scan | |
569 | * without P2P IE in the Probe Request frame. P2P GO would reply | |
570 | * to that with a Probe Response that does not include P2P IE. | |
571 | * Do not update the IEs in this BSS entry to avoid such loss of | |
572 | * information that may be needed for P2P operations to | |
573 | * determine group information. | |
574 | */ | |
575 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Do not update scan IEs for " | |
576 | MACSTR " since that would remove P2P IE information", | |
577 | MAC2STR(bss->bssid)); | |
578 | } else | |
579 | #endif /* CONFIG_P2P */ | |
8c090654 JM |
580 | if (bss->ie_len + bss->beacon_ie_len >= |
581 | res->ie_len + res->beacon_ie_len) { | |
582 | os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len); | |
83922c2d | 583 | bss->ie_len = res->ie_len; |
8c090654 | 584 | bss->beacon_ie_len = res->beacon_ie_len; |
83922c2d JM |
585 | } else { |
586 | struct wpa_bss *nbss; | |
1c83b67e JM |
587 | struct dl_list *prev = bss->list_id.prev; |
588 | dl_list_del(&bss->list_id); | |
8c090654 JM |
589 | nbss = os_realloc(bss, sizeof(*bss) + res->ie_len + |
590 | res->beacon_ie_len); | |
83922c2d | 591 | if (nbss) { |
762b99db JM |
592 | unsigned int i; |
593 | for (i = 0; i < wpa_s->last_scan_res_used; i++) { | |
594 | if (wpa_s->last_scan_res[i] == bss) { | |
595 | wpa_s->last_scan_res[i] = nbss; | |
596 | break; | |
597 | } | |
598 | } | |
eb37e085 EP |
599 | if (wpa_s->current_bss == bss) |
600 | wpa_s->current_bss = nbss; | |
a7f5271d | 601 | wpa_bss_update_pending_connect(wpa_s, bss, nbss); |
83922c2d | 602 | bss = nbss; |
8c090654 JM |
603 | os_memcpy(bss + 1, res + 1, |
604 | res->ie_len + res->beacon_ie_len); | |
83922c2d | 605 | bss->ie_len = res->ie_len; |
8c090654 | 606 | bss->beacon_ie_len = res->beacon_ie_len; |
83922c2d | 607 | } |
1c83b67e | 608 | dl_list_add(prev, &bss->list_id); |
83922c2d | 609 | } |
c739d7e9 JM |
610 | if (changes & WPA_BSS_IES_CHANGED_FLAG) |
611 | wpa_bss_set_hessid(bss); | |
83922c2d | 612 | dl_list_add_tail(&wpa_s->bss, &bss->list); |
158c6c74 WS |
613 | |
614 | notify_bss_changes(wpa_s, changes, bss); | |
762b99db JM |
615 | |
616 | return bss; | |
83922c2d JM |
617 | } |
618 | ||
619 | ||
2c09af30 JM |
620 | /** |
621 | * wpa_bss_update_start - Start a BSS table update from scan results | |
622 | * @wpa_s: Pointer to wpa_supplicant data | |
623 | * | |
624 | * This function is called at the start of each BSS table update round for new | |
625 | * scan results. The actual scan result entries are indicated with calls to | |
626 | * wpa_bss_update_scan_res() and the update round is finished with a call to | |
627 | * wpa_bss_update_end(). | |
628 | */ | |
83922c2d JM |
629 | void wpa_bss_update_start(struct wpa_supplicant *wpa_s) |
630 | { | |
631 | wpa_s->bss_update_idx++; | |
f049052b BG |
632 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u", |
633 | wpa_s->bss_update_idx); | |
a297201d | 634 | wpa_s->last_scan_res_used = 0; |
83922c2d JM |
635 | } |
636 | ||
637 | ||
2c09af30 JM |
638 | /** |
639 | * wpa_bss_update_scan_res - Update a BSS table entry based on a scan result | |
640 | * @wpa_s: Pointer to wpa_supplicant data | |
641 | * @res: Scan result | |
c5f10e80 | 642 | * @fetch_time: Time when the result was fetched from the driver |
2c09af30 JM |
643 | * |
644 | * This function updates a BSS table entry (or adds one) based on a scan result. | |
645 | * This is called separately for each scan result between the calls to | |
646 | * wpa_bss_update_start() and wpa_bss_update_end(). | |
647 | */ | |
83922c2d | 648 | void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s, |
c5f10e80 | 649 | struct wpa_scan_res *res, |
acb69cec | 650 | struct os_reltime *fetch_time) |
83922c2d | 651 | { |
d73b3f2e | 652 | const u8 *ssid, *p2p, *mesh; |
83922c2d JM |
653 | struct wpa_bss *bss; |
654 | ||
4342326f | 655 | if (wpa_s->conf->ignore_old_scan_res) { |
acb69cec | 656 | struct os_reltime update; |
4342326f | 657 | calculate_update_time(fetch_time, res->age, &update); |
acb69cec JB |
658 | if (os_reltime_before(&update, &wpa_s->scan_trigger_time)) { |
659 | struct os_reltime age; | |
660 | os_reltime_sub(&wpa_s->scan_trigger_time, &update, | |
661 | &age); | |
4342326f JM |
662 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Ignore driver BSS " |
663 | "table entry that is %u.%06u seconds older " | |
664 | "than our scan trigger", | |
665 | (unsigned int) age.sec, | |
666 | (unsigned int) age.usec); | |
667 | return; | |
668 | } | |
669 | } | |
670 | ||
83922c2d JM |
671 | ssid = wpa_scan_get_ie(res, WLAN_EID_SSID); |
672 | if (ssid == NULL) { | |
f049052b BG |
673 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for " |
674 | MACSTR, MAC2STR(res->bssid)); | |
83922c2d JM |
675 | return; |
676 | } | |
d9d1b952 | 677 | if (ssid[1] > SSID_MAX_LEN) { |
f049052b BG |
678 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for " |
679 | MACSTR, MAC2STR(res->bssid)); | |
83922c2d JM |
680 | return; |
681 | } | |
682 | ||
0c6b310e | 683 | p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE); |
c772ef43 NKG |
684 | #ifdef CONFIG_P2P |
685 | if (p2p == NULL && | |
686 | wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) { | |
687 | /* | |
688 | * If it's a P2P specific interface, then don't update | |
689 | * the scan result without a P2P IE. | |
690 | */ | |
691 | wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR | |
692 | " update for P2P interface", MAC2STR(res->bssid)); | |
693 | return; | |
694 | } | |
695 | #endif /* CONFIG_P2P */ | |
0c6b310e JM |
696 | if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN && |
697 | os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0) | |
698 | return; /* Skip P2P listen discovery results here */ | |
699 | ||
83922c2d JM |
700 | /* TODO: add option for ignoring BSSes we are not interested in |
701 | * (to save memory) */ | |
d73b3f2e JA |
702 | |
703 | mesh = wpa_scan_get_ie(res, WLAN_EID_MESH_ID); | |
d9d1b952 | 704 | if (mesh && mesh[1] <= SSID_MAX_LEN) |
d73b3f2e JA |
705 | ssid = mesh; |
706 | ||
83922c2d JM |
707 | bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]); |
708 | if (bss == NULL) | |
c5f10e80 | 709 | bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res, fetch_time); |
25b65a14 | 710 | else { |
c5f10e80 | 711 | bss = wpa_bss_update(wpa_s, bss, res, fetch_time); |
25b65a14 JM |
712 | if (wpa_s->last_scan_res) { |
713 | unsigned int i; | |
714 | for (i = 0; i < wpa_s->last_scan_res_used; i++) { | |
715 | if (bss == wpa_s->last_scan_res[i]) { | |
716 | /* Already in the list */ | |
717 | return; | |
718 | } | |
719 | } | |
720 | } | |
721 | } | |
a297201d JM |
722 | |
723 | if (bss == NULL) | |
724 | return; | |
725 | if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) { | |
726 | struct wpa_bss **n; | |
727 | unsigned int siz; | |
728 | if (wpa_s->last_scan_res_size == 0) | |
729 | siz = 32; | |
730 | else | |
731 | siz = wpa_s->last_scan_res_size * 2; | |
732 | n = os_realloc_array(wpa_s->last_scan_res, siz, | |
733 | sizeof(struct wpa_bss *)); | |
734 | if (n == NULL) | |
735 | return; | |
736 | wpa_s->last_scan_res = n; | |
737 | wpa_s->last_scan_res_size = siz; | |
738 | } | |
739 | ||
ece88f76 JM |
740 | if (wpa_s->last_scan_res) |
741 | wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss; | |
83922c2d JM |
742 | } |
743 | ||
744 | ||
8d923a4a JM |
745 | static int wpa_bss_included_in_scan(const struct wpa_bss *bss, |
746 | const struct scan_info *info) | |
747 | { | |
748 | int found; | |
749 | size_t i; | |
750 | ||
751 | if (info == NULL) | |
752 | return 1; | |
753 | ||
754 | if (info->num_freqs) { | |
755 | found = 0; | |
756 | for (i = 0; i < info->num_freqs; i++) { | |
757 | if (bss->freq == info->freqs[i]) { | |
758 | found = 1; | |
759 | break; | |
760 | } | |
761 | } | |
762 | if (!found) | |
763 | return 0; | |
764 | } | |
765 | ||
766 | if (info->num_ssids) { | |
767 | found = 0; | |
768 | for (i = 0; i < info->num_ssids; i++) { | |
769 | const struct wpa_driver_scan_ssid *s = &info->ssids[i]; | |
770 | if ((s->ssid == NULL || s->ssid_len == 0) || | |
771 | (s->ssid_len == bss->ssid_len && | |
772 | os_memcmp(s->ssid, bss->ssid, bss->ssid_len) == | |
773 | 0)) { | |
774 | found = 1; | |
775 | break; | |
776 | } | |
777 | } | |
778 | if (!found) | |
779 | return 0; | |
780 | } | |
781 | ||
782 | return 1; | |
783 | } | |
784 | ||
785 | ||
2c09af30 JM |
786 | /** |
787 | * wpa_bss_update_end - End a BSS table update from scan results | |
788 | * @wpa_s: Pointer to wpa_supplicant data | |
789 | * @info: Information about scan parameters | |
790 | * @new_scan: Whether this update round was based on a new scan | |
791 | * | |
792 | * This function is called at the end of each BSS table update round for new | |
793 | * scan results. The start of the update was indicated with a call to | |
794 | * wpa_bss_update_start(). | |
795 | */ | |
8d923a4a JM |
796 | void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info, |
797 | int new_scan) | |
83922c2d JM |
798 | { |
799 | struct wpa_bss *bss, *n; | |
800 | ||
a12d3454 | 801 | os_get_reltime(&wpa_s->last_scan); |
1a21fd37 | 802 | if ((info && info->aborted) || !new_scan) |
8d923a4a | 803 | return; /* do not expire entries without new scan */ |
83922c2d JM |
804 | |
805 | dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { | |
7d7d57b2 JM |
806 | if (wpa_bss_in_use(wpa_s, bss)) |
807 | continue; | |
8d923a4a JM |
808 | if (!wpa_bss_included_in_scan(bss, info)) |
809 | continue; /* expire only BSSes that were scanned */ | |
83922c2d JM |
810 | if (bss->last_update_idx < wpa_s->bss_update_idx) |
811 | bss->scan_miss_count++; | |
78633c37 SL |
812 | if (bss->scan_miss_count >= |
813 | wpa_s->conf->bss_expiration_scan_count) { | |
a6b71f72 | 814 | wpa_bss_remove(wpa_s, bss, "no match in scan"); |
83922c2d JM |
815 | } |
816 | } | |
a297201d | 817 | |
69278f73 JM |
818 | wpa_printf(MSG_DEBUG, "BSS: last_scan_res_used=%u/%u", |
819 | wpa_s->last_scan_res_used, wpa_s->last_scan_res_size); | |
83922c2d JM |
820 | } |
821 | ||
822 | ||
2c09af30 JM |
823 | /** |
824 | * wpa_bss_flush_by_age - Flush old BSS entries | |
825 | * @wpa_s: Pointer to wpa_supplicant data | |
826 | * @age: Maximum entry age in seconds | |
827 | * | |
828 | * Remove BSS entries that have not been updated during the last @age seconds. | |
829 | */ | |
2b65b30d | 830 | void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age) |
83922c2d | 831 | { |
83922c2d | 832 | struct wpa_bss *bss, *n; |
acb69cec | 833 | struct os_reltime t; |
83922c2d JM |
834 | |
835 | if (dl_list_empty(&wpa_s->bss)) | |
836 | return; | |
837 | ||
acb69cec | 838 | os_get_reltime(&t); |
2b65b30d | 839 | t.sec -= age; |
83922c2d JM |
840 | |
841 | dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { | |
7d7d57b2 JM |
842 | if (wpa_bss_in_use(wpa_s, bss)) |
843 | continue; | |
83922c2d | 844 | |
acb69cec | 845 | if (os_reltime_before(&bss->last_update, &t)) { |
a6b71f72 | 846 | wpa_bss_remove(wpa_s, bss, __func__); |
83922c2d JM |
847 | } else |
848 | break; | |
849 | } | |
2b65b30d SL |
850 | } |
851 | ||
852 | ||
2c09af30 JM |
853 | /** |
854 | * wpa_bss_init - Initialize BSS table | |
855 | * @wpa_s: Pointer to wpa_supplicant data | |
856 | * Returns: 0 on success, -1 on failure | |
857 | * | |
858 | * This prepares BSS table lists and timer for periodic updates. The BSS table | |
859 | * is deinitialized with wpa_bss_deinit() once not needed anymore. | |
860 | */ | |
83922c2d JM |
861 | int wpa_bss_init(struct wpa_supplicant *wpa_s) |
862 | { | |
863 | dl_list_init(&wpa_s->bss); | |
d4bf8f13 | 864 | dl_list_init(&wpa_s->bss_id); |
83922c2d JM |
865 | return 0; |
866 | } | |
867 | ||
868 | ||
2c09af30 JM |
869 | /** |
870 | * wpa_bss_flush - Flush all unused BSS entries | |
871 | * @wpa_s: Pointer to wpa_supplicant data | |
872 | */ | |
2b65b30d | 873 | void wpa_bss_flush(struct wpa_supplicant *wpa_s) |
83922c2d JM |
874 | { |
875 | struct wpa_bss *bss, *n; | |
2b65b30d | 876 | |
949938aa JM |
877 | wpa_s->clear_driver_scan_cache = 1; |
878 | ||
e5fc8c8c JM |
879 | if (wpa_s->bss.next == NULL) |
880 | return; /* BSS table not yet initialized */ | |
2b65b30d SL |
881 | |
882 | dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { | |
883 | if (wpa_bss_in_use(wpa_s, bss)) | |
884 | continue; | |
a6b71f72 | 885 | wpa_bss_remove(wpa_s, bss, __func__); |
2b65b30d SL |
886 | } |
887 | } | |
888 | ||
889 | ||
2c09af30 JM |
890 | /** |
891 | * wpa_bss_deinit - Deinitialize BSS table | |
892 | * @wpa_s: Pointer to wpa_supplicant data | |
893 | */ | |
2b65b30d SL |
894 | void wpa_bss_deinit(struct wpa_supplicant *wpa_s) |
895 | { | |
2b65b30d | 896 | wpa_bss_flush(wpa_s); |
83922c2d | 897 | } |
d4bf8f13 JM |
898 | |
899 | ||
2c09af30 JM |
900 | /** |
901 | * wpa_bss_get_bssid - Fetch a BSS table entry based on BSSID | |
902 | * @wpa_s: Pointer to wpa_supplicant data | |
903 | * @bssid: BSSID | |
904 | * Returns: Pointer to the BSS entry or %NULL if not found | |
905 | */ | |
d4bf8f13 JM |
906 | struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s, |
907 | const u8 *bssid) | |
908 | { | |
909 | struct wpa_bss *bss; | |
d445a5cd JM |
910 | if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid)) |
911 | return NULL; | |
bc839782 | 912 | dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) { |
d4bf8f13 JM |
913 | if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0) |
914 | return bss; | |
915 | } | |
916 | return NULL; | |
917 | } | |
918 | ||
919 | ||
702621e6 JM |
920 | /** |
921 | * wpa_bss_get_bssid_latest - Fetch the latest BSS table entry based on BSSID | |
922 | * @wpa_s: Pointer to wpa_supplicant data | |
923 | * @bssid: BSSID | |
924 | * Returns: Pointer to the BSS entry or %NULL if not found | |
925 | * | |
926 | * This function is like wpa_bss_get_bssid(), but full BSS table is iterated to | |
927 | * find the entry that has the most recent update. This can help in finding the | |
928 | * correct entry in cases where the SSID of the AP may have changed recently | |
929 | * (e.g., in WPS reconfiguration cases). | |
930 | */ | |
931 | struct wpa_bss * wpa_bss_get_bssid_latest(struct wpa_supplicant *wpa_s, | |
932 | const u8 *bssid) | |
933 | { | |
934 | struct wpa_bss *bss, *found = NULL; | |
935 | if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid)) | |
936 | return NULL; | |
937 | dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) { | |
938 | if (os_memcmp(bss->bssid, bssid, ETH_ALEN) != 0) | |
939 | continue; | |
940 | if (found == NULL || | |
acb69cec | 941 | os_reltime_before(&found->last_update, &bss->last_update)) |
702621e6 JM |
942 | found = bss; |
943 | } | |
944 | return found; | |
945 | } | |
946 | ||
947 | ||
0a70f34f | 948 | #ifdef CONFIG_P2P |
2c09af30 JM |
949 | /** |
950 | * wpa_bss_get_p2p_dev_addr - Fetch a BSS table entry based on P2P Device Addr | |
951 | * @wpa_s: Pointer to wpa_supplicant data | |
952 | * @dev_addr: P2P Device Address of the GO | |
953 | * Returns: Pointer to the BSS entry or %NULL if not found | |
954 | */ | |
0a70f34f JM |
955 | struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s, |
956 | const u8 *dev_addr) | |
957 | { | |
958 | struct wpa_bss *bss; | |
959 | dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) { | |
960 | u8 addr[ETH_ALEN]; | |
961 | if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len, | |
962 | addr) == 0 && | |
963 | os_memcmp(addr, dev_addr, ETH_ALEN) == 0) | |
964 | return bss; | |
965 | } | |
966 | return NULL; | |
967 | } | |
968 | #endif /* CONFIG_P2P */ | |
969 | ||
970 | ||
2c09af30 JM |
971 | /** |
972 | * wpa_bss_get_id - Fetch a BSS table entry based on identifier | |
973 | * @wpa_s: Pointer to wpa_supplicant data | |
974 | * @id: Unique identifier (struct wpa_bss::id) assigned for the entry | |
975 | * Returns: Pointer to the BSS entry or %NULL if not found | |
976 | */ | |
d4bf8f13 JM |
977 | struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id) |
978 | { | |
979 | struct wpa_bss *bss; | |
980 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { | |
981 | if (bss->id == id) | |
982 | return bss; | |
983 | } | |
984 | return NULL; | |
985 | } | |
986 | ||
987 | ||
9f42d49c AS |
988 | /** |
989 | * wpa_bss_get_id_range - Fetch a BSS table entry based on identifier range | |
990 | * @wpa_s: Pointer to wpa_supplicant data | |
991 | * @idf: Smallest allowed identifier assigned for the entry | |
992 | * @idf: Largest allowed identifier assigned for the entry | |
993 | * Returns: Pointer to the BSS entry or %NULL if not found | |
994 | * | |
995 | * This function is similar to wpa_bss_get_id() but allows a BSS entry with the | |
996 | * smallest id value to be fetched within the specified range without the | |
997 | * caller having to know the exact id. | |
998 | */ | |
999 | struct wpa_bss * wpa_bss_get_id_range(struct wpa_supplicant *wpa_s, | |
1000 | unsigned int idf, unsigned int idl) | |
1001 | { | |
1002 | struct wpa_bss *bss; | |
1003 | dl_list_for_each(bss, &wpa_s->bss_id, struct wpa_bss, list_id) { | |
1004 | if (bss->id >= idf && bss->id <= idl) | |
1005 | return bss; | |
1006 | } | |
1007 | return NULL; | |
1008 | } | |
1009 | ||
1010 | ||
2c09af30 JM |
1011 | /** |
1012 | * wpa_bss_get_ie - Fetch a specified information element from a BSS entry | |
1013 | * @bss: BSS table entry | |
1014 | * @ie: Information element identitifier (WLAN_EID_*) | |
1015 | * Returns: Pointer to the information element (id field) or %NULL if not found | |
1016 | * | |
1017 | * This function returns the first matching information element in the BSS | |
1018 | * entry. | |
1019 | */ | |
d4bf8f13 JM |
1020 | const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie) |
1021 | { | |
231b04b6 | 1022 | return get_ie((const u8 *) (bss + 1), bss->ie_len, ie); |
d4bf8f13 JM |
1023 | } |
1024 | ||
1025 | ||
2c09af30 JM |
1026 | /** |
1027 | * wpa_bss_get_vendor_ie - Fetch a vendor information element from a BSS entry | |
1028 | * @bss: BSS table entry | |
1029 | * @vendor_type: Vendor type (four octets starting the IE payload) | |
1030 | * Returns: Pointer to the information element (id field) or %NULL if not found | |
1031 | * | |
1032 | * This function returns the first matching information element in the BSS | |
1033 | * entry. | |
1034 | */ | |
d4bf8f13 JM |
1035 | const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type) |
1036 | { | |
1037 | const u8 *end, *pos; | |
1038 | ||
1039 | pos = (const u8 *) (bss + 1); | |
1040 | end = pos + bss->ie_len; | |
1041 | ||
1f32a239 JM |
1042 | while (end - pos > 1) { |
1043 | if (2 + pos[1] > end - pos) | |
d4bf8f13 JM |
1044 | break; |
1045 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1046 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1047 | return pos; | |
1048 | pos += 2 + pos[1]; | |
1049 | } | |
1050 | ||
1051 | return NULL; | |
1052 | } | |
1053 | ||
1054 | ||
bb50ae43 JM |
1055 | /** |
1056 | * wpa_bss_get_vendor_ie_beacon - Fetch a vendor information from a BSS entry | |
1057 | * @bss: BSS table entry | |
1058 | * @vendor_type: Vendor type (four octets starting the IE payload) | |
1059 | * Returns: Pointer to the information element (id field) or %NULL if not found | |
1060 | * | |
1061 | * This function returns the first matching information element in the BSS | |
1062 | * entry. | |
1063 | * | |
1064 | * This function is like wpa_bss_get_vendor_ie(), but uses IE buffer only | |
1065 | * from Beacon frames instead of either Beacon or Probe Response frames. | |
1066 | */ | |
1067 | const u8 * wpa_bss_get_vendor_ie_beacon(const struct wpa_bss *bss, | |
1068 | u32 vendor_type) | |
1069 | { | |
1070 | const u8 *end, *pos; | |
1071 | ||
1072 | if (bss->beacon_ie_len == 0) | |
1073 | return NULL; | |
1074 | ||
1075 | pos = (const u8 *) (bss + 1); | |
1076 | pos += bss->ie_len; | |
1077 | end = pos + bss->beacon_ie_len; | |
1078 | ||
1f32a239 JM |
1079 | while (end - pos > 1) { |
1080 | if (2 + pos[1] > end - pos) | |
bb50ae43 JM |
1081 | break; |
1082 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1083 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1084 | return pos; | |
1085 | pos += 2 + pos[1]; | |
1086 | } | |
1087 | ||
1088 | return NULL; | |
1089 | } | |
1090 | ||
1091 | ||
2c09af30 JM |
1092 | /** |
1093 | * wpa_bss_get_vendor_ie_multi - Fetch vendor IE data from a BSS entry | |
1094 | * @bss: BSS table entry | |
1095 | * @vendor_type: Vendor type (four octets starting the IE payload) | |
1096 | * Returns: Pointer to the information element payload or %NULL if not found | |
1097 | * | |
1098 | * This function returns concatenated payload of possibly fragmented vendor | |
1099 | * specific information elements in the BSS entry. The caller is responsible for | |
1100 | * freeing the returned buffer. | |
1101 | */ | |
d4bf8f13 JM |
1102 | struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss, |
1103 | u32 vendor_type) | |
1104 | { | |
1105 | struct wpabuf *buf; | |
1106 | const u8 *end, *pos; | |
1107 | ||
1108 | buf = wpabuf_alloc(bss->ie_len); | |
1109 | if (buf == NULL) | |
1110 | return NULL; | |
1111 | ||
1112 | pos = (const u8 *) (bss + 1); | |
1113 | end = pos + bss->ie_len; | |
1114 | ||
1f32a239 JM |
1115 | while (end - pos > 1) { |
1116 | if (2 + pos[1] > end - pos) | |
cf8baca6 JM |
1117 | break; |
1118 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1119 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1120 | wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); | |
1121 | pos += 2 + pos[1]; | |
1122 | } | |
1123 | ||
1124 | if (wpabuf_len(buf) == 0) { | |
1125 | wpabuf_free(buf); | |
1126 | buf = NULL; | |
1127 | } | |
1128 | ||
1129 | return buf; | |
1130 | } | |
1131 | ||
1132 | ||
2c09af30 JM |
1133 | /** |
1134 | * wpa_bss_get_vendor_ie_multi_beacon - Fetch vendor IE data from a BSS entry | |
1135 | * @bss: BSS table entry | |
1136 | * @vendor_type: Vendor type (four octets starting the IE payload) | |
1137 | * Returns: Pointer to the information element payload or %NULL if not found | |
1138 | * | |
1139 | * This function returns concatenated payload of possibly fragmented vendor | |
1140 | * specific information elements in the BSS entry. The caller is responsible for | |
1141 | * freeing the returned buffer. | |
1142 | * | |
1143 | * This function is like wpa_bss_get_vendor_ie_multi(), but uses IE buffer only | |
1144 | * from Beacon frames instead of either Beacon or Probe Response frames. | |
1145 | */ | |
cf8baca6 JM |
1146 | struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss, |
1147 | u32 vendor_type) | |
1148 | { | |
1149 | struct wpabuf *buf; | |
1150 | const u8 *end, *pos; | |
1151 | ||
1152 | buf = wpabuf_alloc(bss->beacon_ie_len); | |
1153 | if (buf == NULL) | |
1154 | return NULL; | |
1155 | ||
1156 | pos = (const u8 *) (bss + 1); | |
1157 | pos += bss->ie_len; | |
1158 | end = pos + bss->beacon_ie_len; | |
1159 | ||
1f32a239 JM |
1160 | while (end - pos > 1) { |
1161 | if (2 + pos[1] > end - pos) | |
d4bf8f13 JM |
1162 | break; |
1163 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1164 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1165 | wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); | |
1166 | pos += 2 + pos[1]; | |
1167 | } | |
1168 | ||
1169 | if (wpabuf_len(buf) == 0) { | |
1170 | wpabuf_free(buf); | |
1171 | buf = NULL; | |
1172 | } | |
1173 | ||
1174 | return buf; | |
1175 | } | |
99a6a63f JM |
1176 | |
1177 | ||
2c09af30 JM |
1178 | /** |
1179 | * wpa_bss_get_max_rate - Get maximum legacy TX rate supported in a BSS | |
1180 | * @bss: BSS table entry | |
1181 | * Returns: Maximum legacy rate in units of 500 kbps | |
1182 | */ | |
99a6a63f JM |
1183 | int wpa_bss_get_max_rate(const struct wpa_bss *bss) |
1184 | { | |
1185 | int rate = 0; | |
1186 | const u8 *ie; | |
1187 | int i; | |
1188 | ||
1189 | ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES); | |
1190 | for (i = 0; ie && i < ie[1]; i++) { | |
1191 | if ((ie[i + 2] & 0x7f) > rate) | |
1192 | rate = ie[i + 2] & 0x7f; | |
1193 | } | |
1194 | ||
1195 | ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES); | |
1196 | for (i = 0; ie && i < ie[1]; i++) { | |
1197 | if ((ie[i + 2] & 0x7f) > rate) | |
1198 | rate = ie[i + 2] & 0x7f; | |
1199 | } | |
1200 | ||
1201 | return rate; | |
1202 | } | |
75d328af WS |
1203 | |
1204 | ||
2c09af30 JM |
1205 | /** |
1206 | * wpa_bss_get_bit_rates - Get legacy TX rates supported in a BSS | |
1207 | * @bss: BSS table entry | |
1208 | * @rates: Buffer for returning a pointer to the rates list (units of 500 kbps) | |
1209 | * Returns: number of legacy TX rates or -1 on failure | |
1210 | * | |
1211 | * The caller is responsible for freeing the returned buffer with os_free() in | |
1212 | * case of success. | |
1213 | */ | |
75d328af WS |
1214 | int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates) |
1215 | { | |
1216 | const u8 *ie, *ie2; | |
20766f20 JM |
1217 | int i, j; |
1218 | unsigned int len; | |
1219 | u8 *r; | |
75d328af WS |
1220 | |
1221 | ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES); | |
1222 | ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES); | |
1223 | ||
1224 | len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0); | |
1225 | ||
20766f20 JM |
1226 | r = os_malloc(len); |
1227 | if (!r) | |
75d328af WS |
1228 | return -1; |
1229 | ||
1230 | for (i = 0; ie && i < ie[1]; i++) | |
20766f20 | 1231 | r[i] = ie[i + 2] & 0x7f; |
75d328af WS |
1232 | |
1233 | for (j = 0; ie2 && j < ie2[1]; j++) | |
20766f20 | 1234 | r[i + j] = ie2[j + 2] & 0x7f; |
75d328af | 1235 | |
20766f20 | 1236 | *rates = r; |
75d328af WS |
1237 | return len; |
1238 | } |