Line data Source code
1 : /*
2 : * wpa_supplicant - Temporary BSSID blacklist
3 : * Copyright (c) 2003-2007, Jouni Malinen <j@w1.fi>
4 : *
5 : * This software may be distributed under the terms of the BSD license.
6 : * See README for more details.
7 : */
8 :
9 : #include "includes.h"
10 :
11 : #include "common.h"
12 : #include "wpa_supplicant_i.h"
13 : #include "blacklist.h"
14 :
15 : /**
16 : * wpa_blacklist_get - Get the blacklist entry for a BSSID
17 : * @wpa_s: Pointer to wpa_supplicant data
18 : * @bssid: BSSID
19 : * Returns: Matching blacklist entry for the BSSID or %NULL if not found
20 : */
21 4213 : struct wpa_blacklist * wpa_blacklist_get(struct wpa_supplicant *wpa_s,
22 : const u8 *bssid)
23 : {
24 : struct wpa_blacklist *e;
25 :
26 4213 : if (wpa_s == NULL || bssid == NULL)
27 3 : return NULL;
28 :
29 4210 : e = wpa_s->blacklist;
30 8475 : while (e) {
31 301 : if (os_memcmp(e->bssid, bssid, ETH_ALEN) == 0)
32 246 : return e;
33 55 : e = e->next;
34 : }
35 :
36 3964 : return NULL;
37 : }
38 :
39 :
40 : /**
41 : * wpa_blacklist_add - Add an BSSID to the blacklist
42 : * @wpa_s: Pointer to wpa_supplicant data
43 : * @bssid: BSSID to be added to the blacklist
44 : * Returns: Current blacklist count on success, -1 on failure
45 : *
46 : * This function adds the specified BSSID to the blacklist or increases the
47 : * blacklist count if the BSSID was already listed. It should be called when
48 : * an association attempt fails either due to the selected BSS rejecting
49 : * association or due to timeout.
50 : *
51 : * This blacklist is used to force %wpa_supplicant to go through all available
52 : * BSSes before retrying to associate with an BSS that rejected or timed out
53 : * association. It does not prevent the listed BSS from being used; it only
54 : * changes the order in which they are tried.
55 : */
56 344 : int wpa_blacklist_add(struct wpa_supplicant *wpa_s, const u8 *bssid)
57 : {
58 : struct wpa_blacklist *e;
59 :
60 344 : if (wpa_s == NULL || bssid == NULL)
61 3 : return -1;
62 :
63 341 : e = wpa_blacklist_get(wpa_s, bssid);
64 341 : if (e) {
65 32 : e->count++;
66 224 : wpa_printf(MSG_DEBUG, "BSSID " MACSTR " blacklist count "
67 : "incremented to %d",
68 192 : MAC2STR(bssid), e->count);
69 32 : return e->count;
70 : }
71 :
72 309 : e = os_zalloc(sizeof(*e));
73 309 : if (e == NULL)
74 1 : return -1;
75 308 : os_memcpy(e->bssid, bssid, ETH_ALEN);
76 308 : e->count = 1;
77 308 : e->next = wpa_s->blacklist;
78 308 : wpa_s->blacklist = e;
79 1848 : wpa_printf(MSG_DEBUG, "Added BSSID " MACSTR " into blacklist",
80 1848 : MAC2STR(bssid));
81 :
82 308 : return e->count;
83 : }
84 :
85 :
86 : /**
87 : * wpa_blacklist_del - Remove an BSSID from the blacklist
88 : * @wpa_s: Pointer to wpa_supplicant data
89 : * @bssid: BSSID to be removed from the blacklist
90 : * Returns: 0 on success, -1 on failure
91 : */
92 2466 : int wpa_blacklist_del(struct wpa_supplicant *wpa_s, const u8 *bssid)
93 : {
94 2466 : struct wpa_blacklist *e, *prev = NULL;
95 :
96 2466 : if (wpa_s == NULL || bssid == NULL)
97 3 : return -1;
98 :
99 2463 : e = wpa_s->blacklist;
100 4943 : while (e) {
101 33 : if (os_memcmp(e->bssid, bssid, ETH_ALEN) == 0) {
102 16 : if (prev == NULL) {
103 12 : wpa_s->blacklist = e->next;
104 : } else {
105 4 : prev->next = e->next;
106 : }
107 96 : wpa_printf(MSG_DEBUG, "Removed BSSID " MACSTR " from "
108 96 : "blacklist", MAC2STR(bssid));
109 16 : os_free(e);
110 16 : return 0;
111 : }
112 17 : prev = e;
113 17 : e = e->next;
114 : }
115 2447 : return -1;
116 : }
117 :
118 :
119 : /**
120 : * wpa_blacklist_clear - Clear the blacklist of all entries
121 : * @wpa_s: Pointer to wpa_supplicant data
122 : */
123 3811 : void wpa_blacklist_clear(struct wpa_supplicant *wpa_s)
124 : {
125 : struct wpa_blacklist *e, *prev;
126 3811 : int max_count = 0;
127 :
128 3811 : e = wpa_s->blacklist;
129 3811 : wpa_s->blacklist = NULL;
130 7914 : while (e) {
131 292 : if (e->count > max_count)
132 283 : max_count = e->count;
133 292 : prev = e;
134 292 : e = e->next;
135 1752 : wpa_printf(MSG_DEBUG, "Removed BSSID " MACSTR " from "
136 1752 : "blacklist (clear)", MAC2STR(prev->bssid));
137 292 : os_free(prev);
138 : }
139 :
140 3811 : wpa_s->extra_blacklist_count += max_count;
141 3811 : }
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