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 */
wpa_blacklist_get(struct wpa_supplicant * wpa_s,const u8 * bssid)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
47 * Returns: 0 on success, -1 on failure
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 */
wpa_blacklist_add(struct wpa_supplicant * wpa_s,const u8 * bssid)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);
69 return 0;
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
82 return 0;
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 */
wpa_blacklist_del(struct wpa_supplicant * wpa_s,const u8 * bssid)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 */
wpa_blacklist_clear(struct wpa_supplicant * wpa_s)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 }
134