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 */
wpa_blacklist_get(struct wpa_supplicant * wpa_s,const u8 * bssid)21 struct wpa_blacklist * wpa_blacklist_get(struct wpa_supplicant *wpa_s,
22 const u8 *bssid)
23 {
24 struct wpa_blacklist *e;
25
26 e = wpa_s->blacklist;
27 while (e) {
28 if (os_memcmp(e->bssid, bssid, ETH_ALEN) == 0)
29 return e;
30 e = e->next;
31 }
32
33 return NULL;
34 }
35
36
37 /**
38 * wpa_blacklist_add - Add an BSSID to the blacklist
39 * @wpa_s: Pointer to wpa_supplicant data
40 * @bssid: BSSID to be added to the blacklist
41 * Returns: Current blacklist count on success, -1 on failure
42 *
43 * This function adds the specified BSSID to the blacklist or increases the
44 * blacklist count if the BSSID was already listed. It should be called when
45 * an association attempt fails either due to the selected BSS rejecting
46 * association or due to timeout.
47 *
48 * This blacklist is used to force %wpa_supplicant to go through all available
49 * BSSes before retrying to associate with an BSS that rejected or timed out
50 * association. It does not prevent the listed BSS from being used; it only
51 * changes the order in which they are tried.
52 */
wpa_blacklist_add(struct wpa_supplicant * wpa_s,const u8 * bssid)53 int wpa_blacklist_add(struct wpa_supplicant *wpa_s, const u8 *bssid)
54 {
55 struct wpa_blacklist *e;
56
57 e = wpa_blacklist_get(wpa_s, bssid);
58 if (e) {
59 e->count++;
60 wpa_printf(MSG_DEBUG, "BSSID " MACSTR " blacklist count "
61 "incremented to %d",
62 MAC2STR(bssid), e->count);
63 return e->count;
64 }
65
66 e = os_zalloc(sizeof(*e));
67 if (e == NULL)
68 return -1;
69 os_memcpy(e->bssid, bssid, ETH_ALEN);
70 e->count = 1;
71 e->next = wpa_s->blacklist;
72 wpa_s->blacklist = e;
73 wpa_printf(MSG_DEBUG, "Added BSSID " MACSTR " into blacklist",
74 MAC2STR(bssid));
75
76 return e->count;
77 }
78
79
80 /**
81 * wpa_blacklist_del - Remove an BSSID from the blacklist
82 * @wpa_s: Pointer to wpa_supplicant data
83 * @bssid: BSSID to be removed from the blacklist
84 * Returns: 0 on success, -1 on failure
85 */
wpa_blacklist_del(struct wpa_supplicant * wpa_s,const u8 * bssid)86 int wpa_blacklist_del(struct wpa_supplicant *wpa_s, const u8 *bssid)
87 {
88 struct wpa_blacklist *e, *prev = NULL;
89
90 e = wpa_s->blacklist;
91 while (e) {
92 if (os_memcmp(e->bssid, bssid, ETH_ALEN) == 0) {
93 if (prev == NULL) {
94 wpa_s->blacklist = e->next;
95 } else {
96 prev->next = e->next;
97 }
98 wpa_printf(MSG_DEBUG, "Removed BSSID " MACSTR " from "
99 "blacklist", MAC2STR(bssid));
100 os_free(e);
101 return 0;
102 }
103 prev = e;
104 e = e->next;
105 }
106 return -1;
107 }
108
109
110 /**
111 * wpa_blacklist_clear - Clear the blacklist of all entries
112 * @wpa_s: Pointer to wpa_supplicant data
113 */
wpa_blacklist_clear(struct wpa_supplicant * wpa_s)114 void wpa_blacklist_clear(struct wpa_supplicant *wpa_s)
115 {
116 struct wpa_blacklist *e, *prev;
117
118 e = wpa_s->blacklist;
119 wpa_s->blacklist = NULL;
120 while (e) {
121 prev = e;
122 e = e->next;
123 wpa_printf(MSG_DEBUG, "Removed BSSID " MACSTR " from "
124 "blacklist (clear)", MAC2STR(prev->bssid));
125 os_free(prev);
126 }
127 }
128