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1 | /* |
2 | * WPA Supplicant - Scanning | |
3 | * Copyright (c) 2003-2008, Jouni Malinen <j@w1.fi> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * Alternatively, this software may be distributed under the terms of BSD | |
10 | * license. | |
11 | * | |
12 | * See README and COPYING for more details. | |
13 | */ | |
14 | ||
15 | #include "includes.h" | |
16 | ||
17 | #include "common.h" | |
18 | #include "eloop.h" | |
19 | #include "config.h" | |
20 | #include "wpa_supplicant_i.h" | |
21 | #include "mlme.h" | |
22 | #include "uuid.h" | |
23 | ||
24 | ||
25 | static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s) | |
26 | { | |
27 | struct wpa_ssid *ssid; | |
28 | union wpa_event_data data; | |
29 | ||
30 | ssid = wpa_supplicant_get_ssid(wpa_s); | |
31 | if (ssid == NULL) | |
32 | return; | |
33 | ||
34 | if (wpa_s->current_ssid == NULL) | |
35 | wpa_s->current_ssid = ssid; | |
36 | wpa_supplicant_initiate_eapol(wpa_s); | |
37 | wpa_printf(MSG_DEBUG, "Already associated with a configured network - " | |
38 | "generating associated event"); | |
39 | os_memset(&data, 0, sizeof(data)); | |
40 | wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data); | |
41 | } | |
42 | ||
43 | ||
44 | static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx) | |
45 | { | |
46 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
47 | struct wpa_ssid *ssid; | |
48 | int enabled, scan_req = 0, ret; | |
49 | const u8 *extra_ie = NULL; | |
50 | size_t extra_ie_len = 0; | |
51 | ||
52 | if (wpa_s->disconnected && !wpa_s->scan_req) | |
53 | return; | |
54 | ||
55 | enabled = 0; | |
56 | ssid = wpa_s->conf->ssid; | |
57 | while (ssid) { | |
58 | if (!ssid->disabled) { | |
59 | enabled++; | |
60 | break; | |
61 | } | |
62 | ssid = ssid->next; | |
63 | } | |
64 | if (!enabled && !wpa_s->scan_req) { | |
65 | wpa_printf(MSG_DEBUG, "No enabled networks - do not scan"); | |
66 | wpa_supplicant_set_state(wpa_s, WPA_INACTIVE); | |
67 | return; | |
68 | } | |
69 | scan_req = wpa_s->scan_req; | |
70 | wpa_s->scan_req = 0; | |
71 | ||
72 | if (wpa_s->conf->ap_scan != 0 && | |
73 | wpa_s->driver && os_strcmp(wpa_s->driver->name, "wired") == 0) { | |
74 | wpa_printf(MSG_DEBUG, "Using wired driver - overriding " | |
75 | "ap_scan configuration"); | |
76 | wpa_s->conf->ap_scan = 0; | |
77 | } | |
78 | ||
79 | if (wpa_s->conf->ap_scan == 0) { | |
80 | wpa_supplicant_gen_assoc_event(wpa_s); | |
81 | return; | |
82 | } | |
83 | ||
84 | if (wpa_s->wpa_state == WPA_DISCONNECTED || | |
85 | wpa_s->wpa_state == WPA_INACTIVE) | |
86 | wpa_supplicant_set_state(wpa_s, WPA_SCANNING); | |
87 | ||
88 | ssid = wpa_s->conf->ssid; | |
89 | if (wpa_s->prev_scan_ssid != BROADCAST_SSID_SCAN) { | |
90 | while (ssid) { | |
91 | if (ssid == wpa_s->prev_scan_ssid) { | |
92 | ssid = ssid->next; | |
93 | break; | |
94 | } | |
95 | ssid = ssid->next; | |
96 | } | |
97 | } | |
98 | while (ssid) { | |
99 | if (!ssid->disabled && | |
100 | (ssid->scan_ssid || wpa_s->conf->ap_scan == 2)) | |
101 | break; | |
102 | ssid = ssid->next; | |
103 | } | |
104 | ||
105 | if (scan_req != 2 && wpa_s->conf->ap_scan == 2) { | |
106 | /* | |
107 | * ap_scan=2 mode - try to associate with each SSID instead of | |
108 | * scanning for each scan_ssid=1 network. | |
109 | */ | |
110 | if (ssid == NULL) { | |
111 | wpa_printf(MSG_DEBUG, "wpa_supplicant_scan: Reached " | |
112 | "end of scan list - go back to beginning"); | |
113 | wpa_s->prev_scan_ssid = BROADCAST_SSID_SCAN; | |
114 | wpa_supplicant_req_scan(wpa_s, 0, 0); | |
115 | return; | |
116 | } | |
117 | if (ssid->next) { | |
118 | /* Continue from the next SSID on the next attempt. */ | |
119 | wpa_s->prev_scan_ssid = ssid; | |
120 | } else { | |
121 | /* Start from the beginning of the SSID list. */ | |
122 | wpa_s->prev_scan_ssid = BROADCAST_SSID_SCAN; | |
123 | } | |
124 | wpa_supplicant_associate(wpa_s, NULL, ssid); | |
125 | return; | |
126 | } | |
127 | ||
128 | wpa_printf(MSG_DEBUG, "Starting AP scan (%s SSID)", | |
129 | ssid ? "specific": "broadcast"); | |
130 | if (ssid) { | |
131 | wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID", | |
132 | ssid->ssid, ssid->ssid_len); | |
133 | wpa_s->prev_scan_ssid = ssid; | |
134 | } else | |
135 | wpa_s->prev_scan_ssid = BROADCAST_SSID_SCAN; | |
136 | ||
137 | if (wpa_s->scan_res_tried == 0 && wpa_s->conf->ap_scan == 1 && | |
138 | !wpa_s->use_client_mlme) { | |
139 | wpa_s->scan_res_tried++; | |
140 | wpa_printf(MSG_DEBUG, "Trying to get current scan results " | |
141 | "first without requesting a new scan to speed up " | |
142 | "initial association"); | |
143 | wpa_supplicant_event(wpa_s, EVENT_SCAN_RESULTS, NULL); | |
144 | return; | |
145 | } | |
146 | ||
147 | if (wpa_s->use_client_mlme) { | |
148 | ieee80211_sta_set_probe_req_ie(wpa_s, extra_ie, extra_ie_len); | |
149 | ret = ieee80211_sta_req_scan(wpa_s, ssid ? ssid->ssid : NULL, | |
150 | ssid ? ssid->ssid_len : 0); | |
151 | } else { | |
152 | wpa_drv_set_probe_req_ie(wpa_s, extra_ie, extra_ie_len); | |
153 | ret = wpa_drv_scan(wpa_s, ssid ? ssid->ssid : NULL, | |
154 | ssid ? ssid->ssid_len : 0); | |
155 | } | |
156 | ||
157 | if (ret) { | |
158 | wpa_printf(MSG_WARNING, "Failed to initiate AP scan."); | |
159 | wpa_supplicant_req_scan(wpa_s, 10, 0); | |
160 | } | |
161 | } | |
162 | ||
163 | ||
164 | /** | |
165 | * wpa_supplicant_req_scan - Schedule a scan for neighboring access points | |
166 | * @wpa_s: Pointer to wpa_supplicant data | |
167 | * @sec: Number of seconds after which to scan | |
168 | * @usec: Number of microseconds after which to scan | |
169 | * | |
170 | * This function is used to schedule a scan for neighboring access points after | |
171 | * the specified time. | |
172 | */ | |
173 | void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec) | |
174 | { | |
175 | wpa_msg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec", | |
176 | sec, usec); | |
177 | eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); | |
178 | eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL); | |
179 | } | |
180 | ||
181 | ||
182 | /** | |
183 | * wpa_supplicant_cancel_scan - Cancel a scheduled scan request | |
184 | * @wpa_s: Pointer to wpa_supplicant data | |
185 | * | |
186 | * This function is used to cancel a scan request scheduled with | |
187 | * wpa_supplicant_req_scan(). | |
188 | */ | |
189 | void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s) | |
190 | { | |
191 | wpa_msg(wpa_s, MSG_DEBUG, "Cancelling scan request"); | |
192 | eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); | |
193 | } |