18dbcf02cSchristos /*
28dbcf02cSchristos * wpa_supplicant - Temporary BSSID blacklist
38dbcf02cSchristos * Copyright (c) 2003-2007, Jouni Malinen <j@w1.fi>
48dbcf02cSchristos *
5*62a52023Schristos * This software may be distributed under the terms of the BSD license.
6*62a52023Schristos * See README for more details.
78dbcf02cSchristos */
88dbcf02cSchristos
98dbcf02cSchristos #include "includes.h"
108dbcf02cSchristos
118dbcf02cSchristos #include "common.h"
128dbcf02cSchristos #include "wpa_supplicant_i.h"
138dbcf02cSchristos #include "blacklist.h"
148dbcf02cSchristos
158dbcf02cSchristos /**
168dbcf02cSchristos * wpa_blacklist_get - Get the blacklist entry for a BSSID
178dbcf02cSchristos * @wpa_s: Pointer to wpa_supplicant data
188dbcf02cSchristos * @bssid: BSSID
198dbcf02cSchristos * Returns: Matching blacklist entry for the BSSID or %NULL if not found
208dbcf02cSchristos */
wpa_blacklist_get(struct wpa_supplicant * wpa_s,const u8 * bssid)218dbcf02cSchristos struct wpa_blacklist * wpa_blacklist_get(struct wpa_supplicant *wpa_s,
228dbcf02cSchristos const u8 *bssid)
238dbcf02cSchristos {
248dbcf02cSchristos struct wpa_blacklist *e;
258dbcf02cSchristos
26*62a52023Schristos if (wpa_s == NULL || bssid == NULL)
27*62a52023Schristos return NULL;
28*62a52023Schristos
298dbcf02cSchristos e = wpa_s->blacklist;
308dbcf02cSchristos while (e) {
318dbcf02cSchristos if (os_memcmp(e->bssid, bssid, ETH_ALEN) == 0)
328dbcf02cSchristos return e;
338dbcf02cSchristos e = e->next;
348dbcf02cSchristos }
358dbcf02cSchristos
368dbcf02cSchristos return NULL;
378dbcf02cSchristos }
388dbcf02cSchristos
398dbcf02cSchristos
408dbcf02cSchristos /**
418dbcf02cSchristos * wpa_blacklist_add - Add an BSSID to the blacklist
428dbcf02cSchristos * @wpa_s: Pointer to wpa_supplicant data
438dbcf02cSchristos * @bssid: BSSID to be added to the blacklist
4442669be3Schristos * Returns: Current blacklist count on success, -1 on failure
458dbcf02cSchristos *
468dbcf02cSchristos * This function adds the specified BSSID to the blacklist or increases the
478dbcf02cSchristos * blacklist count if the BSSID was already listed. It should be called when
488dbcf02cSchristos * an association attempt fails either due to the selected BSS rejecting
498dbcf02cSchristos * association or due to timeout.
508dbcf02cSchristos *
518dbcf02cSchristos * This blacklist is used to force %wpa_supplicant to go through all available
528dbcf02cSchristos * BSSes before retrying to associate with an BSS that rejected or timed out
538dbcf02cSchristos * association. It does not prevent the listed BSS from being used; it only
548dbcf02cSchristos * changes the order in which they are tried.
558dbcf02cSchristos */
wpa_blacklist_add(struct wpa_supplicant * wpa_s,const u8 * bssid)568dbcf02cSchristos int wpa_blacklist_add(struct wpa_supplicant *wpa_s, const u8 *bssid)
578dbcf02cSchristos {
588dbcf02cSchristos struct wpa_blacklist *e;
598dbcf02cSchristos
60*62a52023Schristos if (wpa_s == NULL || bssid == NULL)
61*62a52023Schristos return -1;
62*62a52023Schristos
638dbcf02cSchristos e = wpa_blacklist_get(wpa_s, bssid);
648dbcf02cSchristos if (e) {
658dbcf02cSchristos e->count++;
668dbcf02cSchristos wpa_printf(MSG_DEBUG, "BSSID " MACSTR " blacklist count "
678dbcf02cSchristos "incremented to %d",
688dbcf02cSchristos MAC2STR(bssid), e->count);
6942669be3Schristos return e->count;
708dbcf02cSchristos }
718dbcf02cSchristos
728dbcf02cSchristos e = os_zalloc(sizeof(*e));
738dbcf02cSchristos if (e == NULL)
748dbcf02cSchristos return -1;
758dbcf02cSchristos os_memcpy(e->bssid, bssid, ETH_ALEN);
768dbcf02cSchristos e->count = 1;
778dbcf02cSchristos e->next = wpa_s->blacklist;
788dbcf02cSchristos wpa_s->blacklist = e;
798dbcf02cSchristos wpa_printf(MSG_DEBUG, "Added BSSID " MACSTR " into blacklist",
808dbcf02cSchristos MAC2STR(bssid));
818dbcf02cSchristos
8242669be3Schristos return e->count;
838dbcf02cSchristos }
848dbcf02cSchristos
858dbcf02cSchristos
868dbcf02cSchristos /**
878dbcf02cSchristos * wpa_blacklist_del - Remove an BSSID from the blacklist
888dbcf02cSchristos * @wpa_s: Pointer to wpa_supplicant data
898dbcf02cSchristos * @bssid: BSSID to be removed from the blacklist
908dbcf02cSchristos * Returns: 0 on success, -1 on failure
918dbcf02cSchristos */
wpa_blacklist_del(struct wpa_supplicant * wpa_s,const u8 * bssid)928dbcf02cSchristos int wpa_blacklist_del(struct wpa_supplicant *wpa_s, const u8 *bssid)
938dbcf02cSchristos {
948dbcf02cSchristos struct wpa_blacklist *e, *prev = NULL;
958dbcf02cSchristos
96*62a52023Schristos if (wpa_s == NULL || bssid == NULL)
97*62a52023Schristos return -1;
98*62a52023Schristos
998dbcf02cSchristos e = wpa_s->blacklist;
1008dbcf02cSchristos while (e) {
1018dbcf02cSchristos if (os_memcmp(e->bssid, bssid, ETH_ALEN) == 0) {
1028dbcf02cSchristos if (prev == NULL) {
1038dbcf02cSchristos wpa_s->blacklist = e->next;
1048dbcf02cSchristos } else {
1058dbcf02cSchristos prev->next = e->next;
1068dbcf02cSchristos }
1078dbcf02cSchristos wpa_printf(MSG_DEBUG, "Removed BSSID " MACSTR " from "
1088dbcf02cSchristos "blacklist", MAC2STR(bssid));
1098dbcf02cSchristos os_free(e);
1108dbcf02cSchristos return 0;
1118dbcf02cSchristos }
1128dbcf02cSchristos prev = e;
1138dbcf02cSchristos e = e->next;
1148dbcf02cSchristos }
1158dbcf02cSchristos return -1;
1168dbcf02cSchristos }
1178dbcf02cSchristos
1188dbcf02cSchristos
1198dbcf02cSchristos /**
1208dbcf02cSchristos * wpa_blacklist_clear - Clear the blacklist of all entries
1218dbcf02cSchristos * @wpa_s: Pointer to wpa_supplicant data
1228dbcf02cSchristos */
wpa_blacklist_clear(struct wpa_supplicant * wpa_s)1238dbcf02cSchristos void wpa_blacklist_clear(struct wpa_supplicant *wpa_s)
1248dbcf02cSchristos {
1258dbcf02cSchristos struct wpa_blacklist *e, *prev;
126*62a52023Schristos int max_count = 0;
1278dbcf02cSchristos
1288dbcf02cSchristos e = wpa_s->blacklist;
1298dbcf02cSchristos wpa_s->blacklist = NULL;
1308dbcf02cSchristos while (e) {
131*62a52023Schristos if (e->count > max_count)
132*62a52023Schristos max_count = e->count;
1338dbcf02cSchristos prev = e;
1348dbcf02cSchristos e = e->next;
1358dbcf02cSchristos wpa_printf(MSG_DEBUG, "Removed BSSID " MACSTR " from "
1368dbcf02cSchristos "blacklist (clear)", MAC2STR(prev->bssid));
1378dbcf02cSchristos os_free(prev);
1388dbcf02cSchristos }
139*62a52023Schristos
140*62a52023Schristos wpa_s->extra_blacklist_count += max_count;
1418dbcf02cSchristos }
142