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6fc6879b JM |
1 | /* |
2 | * wpa_supplicant - Temporary BSSID blacklist | |
3 | * Copyright (c) 2003-2007, 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 "wpa_supplicant_i.h" | |
19 | #include "blacklist.h" | |
20 | ||
21 | /** | |
22 | * wpa_blacklist_get - Get the blacklist entry for a BSSID | |
23 | * @wpa_s: Pointer to wpa_supplicant data | |
24 | * @bssid: BSSID | |
25 | * Returns: Matching blacklist entry for the BSSID or %NULL if not found | |
26 | */ | |
27 | struct wpa_blacklist * wpa_blacklist_get(struct wpa_supplicant *wpa_s, | |
28 | const u8 *bssid) | |
29 | { | |
30 | struct wpa_blacklist *e; | |
31 | ||
32 | e = wpa_s->blacklist; | |
33 | while (e) { | |
34 | if (os_memcmp(e->bssid, bssid, ETH_ALEN) == 0) | |
35 | return e; | |
36 | e = e->next; | |
37 | } | |
38 | ||
39 | return NULL; | |
40 | } | |
41 | ||
42 | ||
43 | /** | |
44 | * wpa_blacklist_add - Add an BSSID to the blacklist | |
45 | * @wpa_s: Pointer to wpa_supplicant data | |
46 | * @bssid: BSSID to be added to the blacklist | |
7e6646c7 | 47 | * Returns: Current blacklist count on success, -1 on failure |
6fc6879b JM |
48 | * |
49 | * This function adds the specified BSSID to the blacklist or increases the | |
50 | * blacklist count if the BSSID was already listed. It should be called when | |
51 | * an association attempt fails either due to the selected BSS rejecting | |
52 | * association or due to timeout. | |
53 | * | |
54 | * This blacklist is used to force %wpa_supplicant to go through all available | |
55 | * BSSes before retrying to associate with an BSS that rejected or timed out | |
56 | * association. It does not prevent the listed BSS from being used; it only | |
57 | * changes the order in which they are tried. | |
58 | */ | |
59 | int wpa_blacklist_add(struct wpa_supplicant *wpa_s, const u8 *bssid) | |
60 | { | |
61 | struct wpa_blacklist *e; | |
62 | ||
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 | ||
96 | e = wpa_s->blacklist; | |
97 | while (e) { | |
98 | if (os_memcmp(e->bssid, bssid, ETH_ALEN) == 0) { | |
99 | if (prev == NULL) { | |
100 | wpa_s->blacklist = e->next; | |
101 | } else { | |
102 | prev->next = e->next; | |
103 | } | |
104 | wpa_printf(MSG_DEBUG, "Removed BSSID " MACSTR " from " | |
105 | "blacklist", MAC2STR(bssid)); | |
106 | os_free(e); | |
107 | return 0; | |
108 | } | |
109 | prev = e; | |
110 | e = e->next; | |
111 | } | |
112 | return -1; | |
113 | } | |
114 | ||
115 | ||
116 | /** | |
117 | * wpa_blacklist_clear - Clear the blacklist of all entries | |
118 | * @wpa_s: Pointer to wpa_supplicant data | |
119 | */ | |
120 | void wpa_blacklist_clear(struct wpa_supplicant *wpa_s) | |
121 | { | |
122 | struct wpa_blacklist *e, *prev; | |
123 | ||
124 | e = wpa_s->blacklist; | |
125 | wpa_s->blacklist = NULL; | |
126 | while (e) { | |
127 | prev = e; | |
128 | e = e->next; | |
129 | wpa_printf(MSG_DEBUG, "Removed BSSID " MACSTR " from " | |
130 | "blacklist (clear)", MAC2STR(prev->bssid)); | |
131 | os_free(prev); | |
132 | } | |
133 | } |