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6fc6879b JM |
1 | /* |
2 | * wpa_supplicant - Temporary BSSID blacklist | |
3 | * Copyright (c) 2003-2007, Jouni Malinen <j@w1.fi> | |
4 | * | |
0f3d578e JM |
5 | * This software may be distributed under the terms of the BSD license. |
6 | * See README for more details. | |
6fc6879b JM |
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 | struct wpa_blacklist * wpa_blacklist_get(struct wpa_supplicant *wpa_s, | |
22 | const u8 *bssid) | |
23 | { | |
24 | struct wpa_blacklist *e; | |
25 | ||
5ff2c7fa SL |
26 | if (wpa_s == NULL || bssid == NULL) |
27 | return NULL; | |
28 | ||
6fc6879b JM |
29 | e = wpa_s->blacklist; |
30 | while (e) { | |
31 | if (os_memcmp(e->bssid, bssid, ETH_ALEN) == 0) | |
32 | return e; | |
33 | e = e->next; | |
34 | } | |
35 | ||
36 | 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 | |
7e6646c7 | 44 | * Returns: Current blacklist count on success, -1 on failure |
6fc6879b JM |
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 | int wpa_blacklist_add(struct wpa_supplicant *wpa_s, const u8 *bssid) | |
57 | { | |
58 | struct wpa_blacklist *e; | |
59 | ||
5ff2c7fa SL |
60 | if (wpa_s == NULL || bssid == NULL) |
61 | return -1; | |
62 | ||
6fc6879b JM |
63 | e = wpa_blacklist_get(wpa_s, bssid); |
64 | if (e) { | |
65 | e->count++; | |
66 | wpa_printf(MSG_DEBUG, "BSSID " MACSTR " blacklist count " | |
67 | "incremented to %d", | |
68 | MAC2STR(bssid), e->count); | |
7e6646c7 | 69 | return e->count; |
6fc6879b JM |
70 | } |
71 | ||
72 | e = os_zalloc(sizeof(*e)); | |
73 | if (e == NULL) | |
74 | return -1; | |
75 | os_memcpy(e->bssid, bssid, ETH_ALEN); | |
76 | e->count = 1; | |
77 | e->next = wpa_s->blacklist; | |
78 | wpa_s->blacklist = e; | |
79 | wpa_printf(MSG_DEBUG, "Added BSSID " MACSTR " into blacklist", | |
80 | MAC2STR(bssid)); | |
81 | ||
7e6646c7 | 82 | return e->count; |
6fc6879b JM |
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 | int wpa_blacklist_del(struct wpa_supplicant *wpa_s, const u8 *bssid) | |
93 | { | |
94 | struct wpa_blacklist *e, *prev = NULL; | |
95 | ||
5ff2c7fa SL |
96 | if (wpa_s == NULL || bssid == NULL) |
97 | return -1; | |
98 | ||
6fc6879b JM |
99 | e = wpa_s->blacklist; |
100 | while (e) { | |
101 | if (os_memcmp(e->bssid, bssid, ETH_ALEN) == 0) { | |
102 | if (prev == NULL) { | |
103 | wpa_s->blacklist = e->next; | |
104 | } else { | |
105 | prev->next = e->next; | |
106 | } | |
107 | wpa_printf(MSG_DEBUG, "Removed BSSID " MACSTR " from " | |
108 | "blacklist", MAC2STR(bssid)); | |
109 | os_free(e); | |
110 | return 0; | |
111 | } | |
112 | prev = e; | |
113 | e = e->next; | |
114 | } | |
115 | 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 | void wpa_blacklist_clear(struct wpa_supplicant *wpa_s) | |
124 | { | |
125 | struct wpa_blacklist *e, *prev; | |
f1a52633 | 126 | int max_count = 0; |
6fc6879b JM |
127 | |
128 | e = wpa_s->blacklist; | |
129 | wpa_s->blacklist = NULL; | |
130 | while (e) { | |
f1a52633 JM |
131 | if (e->count > max_count) |
132 | max_count = e->count; | |
6fc6879b JM |
133 | prev = e; |
134 | e = e->next; | |
135 | wpa_printf(MSG_DEBUG, "Removed BSSID " MACSTR " from " | |
136 | "blacklist (clear)", MAC2STR(prev->bssid)); | |
137 | os_free(prev); | |
138 | } | |
f1a52633 JM |
139 | |
140 | wpa_s->extra_blacklist_count += max_count; | |
6fc6879b | 141 | } |