--- /dev/null
+Add network specific BSSID black and white lists
+
+This change adds the configuration options "bssid_whitelist" and
+"bssid_blacklist" used to limit the AP selection of a network to a
+specified (finite) set or discard certain APs.
+
+This can be useful for environments where multiple networks operate
+using the same SSID and roaming between those is not desired. It is also
+useful to ignore a faulty or otherwise unwanted AP.
+
+In many applications it is useful not just to enumerate a group of well
+known access points, but to use a address/mask notation to match an
+entire set of addresses (ca:ff:ee:00:00:00/ff:ff:ff:00:00:00).
+
+This change expands the data structures used by MAC lists to include a
+mask indicating the significant (non-masked) portions of an address and
+extends the list parser to recognize mask suffixes.
+
+Signed-off-by: Stefan Tomanek <stefan.tomanek@wertarbyte.de>
+---
+ src/utils/common.c | 86 ++++++++++++--
+ src/utils/common.h | 3 +
+ wpa_supplicant/config.c | 223 ++++++++++++++++++++++++-------------
+ wpa_supplicant/config_ssid.h | 12 ++
+ wpa_supplicant/events.c | 45 ++++++++
+ wpa_supplicant/p2p_supplicant.c | 40 ++++---
+ wpa_supplicant/wpa_supplicant.conf | 15 +++
+ 7 files changed, 323 insertions(+), 101 deletions(-)
+
+diff --git a/src/utils/common.c b/src/utils/common.c
+index 9902004..dd6e4aa 100644
+--- a/src/utils/common.c
++++ b/src/utils/common.c
+@@ -36,6 +36,25 @@ int hex2byte(const char *hex)
+ }
+
+
++static const char * hwaddr_parse(const char *txt, u8 *addr)
++{
++ size_t i;
++
++ for (i = 0; i < ETH_ALEN; i++) {
++ int a;
++
++ a = hex2byte(txt);
++ if (a < 0)
++ return NULL;
++ txt += 2;
++ addr[i] = a;
++ if (i < ETH_ALEN - 1 && *txt++ != ':')
++ return NULL;
++ }
++ return txt;
++}
++
++
+ /**
+ * hwaddr_aton - Convert ASCII string to MAC address (colon-delimited format)
+ * @txt: MAC address as a string (e.g., "00:11:22:33:44:55")
+@@ -44,25 +63,46 @@ int hex2byte(const char *hex)
+ */
+ int hwaddr_aton(const char *txt, u8 *addr)
+ {
+- int i;
++ return hwaddr_parse(txt, addr) ? 0 : -1;
++}
+
+- for (i = 0; i < 6; i++) {
+- int a, b;
+
+- a = hex2num(*txt++);
+- if (a < 0)
+- return -1;
+- b = hex2num(*txt++);
+- if (b < 0)
+- return -1;
+- *addr++ = (a << 4) | b;
+- if (i < 5 && *txt++ != ':')
++/**
++ * hwaddr_masked_aton - Convert ASCII string with optional mask to MAC address (colon-delimited format)
++ * @txt: MAC address with optional mask as a string (e.g., "00:11:22:33:44:55/ff:ff:ff:ff:00:00")
++ * @addr: Buffer for the MAC address (ETH_ALEN = 6 bytes)
++ * @mask: Buffer for the MAC address mask (ETH_ALEN = 6 bytes)
++ * @maskable: Flag to indicate whether a mask is allowed
++ * Returns: 0 on success, -1 on failure (e.g., string not a MAC address)
++ */
++int hwaddr_masked_aton(const char *txt, u8 *addr, u8 *mask, u8 maskable)
++{
++ const char *r;
++
++ /* parse address part */
++ r = hwaddr_parse(txt, addr);
++ if (!r)
++ return -1;
++
++ /* check for optional mask */
++ if (*r == '\0' || isspace(*r)) {
++ /* no mask specified, assume default */
++ os_memset(mask, 0xff, ETH_ALEN);
++ } else if (maskable && *r == '/') {
++ /* mask specified and allowed */
++ r = hwaddr_parse(r + 1, mask);
++ /* parser error? */
++ if (!r)
+ return -1;
++ } else {
++ /* mask specified but not allowed or trailing garbage */
++ return -1;
+ }
+
+ return 0;
+ }
+
++
+ /**
+ * hwaddr_compact_aton - Convert ASCII string to MAC address (no colon delimitors format)
+ * @txt: MAC address as a string (e.g., "001122334455")
+@@ -144,6 +184,30 @@ int hexstr2bin(const char *hex, u8 *buf, size_t len)
+ }
+
+
++int hwaddr_mask_txt(char *buf, size_t len, const u8 *addr, const u8 *mask)
++{
++ size_t i;
++ int print_mask = 0;
++ int res;
++
++ for (i = 0; i < ETH_ALEN; i++) {
++ if (mask[i] != 0xff) {
++ print_mask = 1;
++ break;
++ }
++ }
++
++ if (print_mask)
++ res = os_snprintf(buf, len, MACSTR "/" MACSTR,
++ MAC2STR(addr), MAC2STR(mask));
++ else
++ res = os_snprintf(buf, len, MACSTR, MAC2STR(addr));
++ if (os_snprintf_error(len, res))
++ return -1;
++ return res;
++}
++
++
+ /**
+ * inc_byte_array - Increment arbitrary length byte array by one
+ * @counter: Pointer to byte array
+diff --git a/src/utils/common.h b/src/utils/common.h
+index 14d9ad1..1127074 100644
+--- a/src/utils/common.h
++++ b/src/utils/common.h
+@@ -468,6 +468,7 @@ typedef u64 __bitwise le64;
+ #endif /* __must_check */
+
+ int hwaddr_aton(const char *txt, u8 *addr);
++int hwaddr_masked_aton(const char *txt, u8 *addr, u8 *mask, u8 maskable);
+ int hwaddr_compact_aton(const char *txt, u8 *addr);
+ int hwaddr_aton2(const char *txt, u8 *addr);
+ int hex2byte(const char *hex);
+@@ -478,6 +479,8 @@ int wpa_snprintf_hex(char *buf, size_t buf_size, const u8 *data, size_t len);
+ int wpa_snprintf_hex_uppercase(char *buf, size_t buf_size, const u8 *data,
+ size_t len);
+
++int hwaddr_mask_txt(char *buf, size_t len, const u8 *addr, const u8 *mask);
++
+ #ifdef CONFIG_NATIVE_WINDOWS
+ void wpa_unicode2ascii_inplace(TCHAR *str);
+ TCHAR * wpa_strdup_tchar(const char *str);
+diff --git a/wpa_supplicant/config.c b/wpa_supplicant/config.c
+index 8d1e1e0..7f742cb 100644
+--- a/wpa_supplicant/config.c
++++ b/wpa_supplicant/config.c
+@@ -235,6 +235,99 @@ static char * wpa_config_write_int(const struct parse_data *data,
+ #endif /* NO_CONFIG_WRITE */
+
+
++static int wpa_config_parse_addr_list(const struct parse_data *data,
++ int line, const char *value,
++ u8 **list, size_t *num, char *name,
++ u8 abort_on_error, u8 masked)
++{
++ const char *pos;
++ u8 *buf, *n, addr[2 * ETH_ALEN];
++ size_t count;
++
++ buf = NULL;
++ count = 0;
++
++ pos = value;
++ while (pos && *pos) {
++ while (*pos == ' ')
++ pos++;
++
++ if (hwaddr_masked_aton(pos, addr, &addr[ETH_ALEN], masked)) {
++ if (abort_on_error || count == 0) {
++ wpa_printf(MSG_ERROR,
++ "Line %d: Invalid %s address '%s'",
++ line, name, value);
++ os_free(buf);
++ return -1;
++ }
++ /* continue anyway since this could have been from a
++ * truncated configuration file line */
++ wpa_printf(MSG_INFO,
++ "Line %d: Ignore likely truncated %s address '%s'",
++ line, name, pos);
++ } else {
++ n = os_realloc_array(buf, count + 1, 2 * ETH_ALEN);
++ if (n == NULL) {
++ os_free(buf);
++ return -1;
++ }
++ buf = n;
++ os_memmove(buf + 2 * ETH_ALEN, buf,
++ count * 2 * ETH_ALEN);
++ os_memcpy(buf, addr, 2 * ETH_ALEN);
++ count++;
++ wpa_printf(MSG_MSGDUMP,
++ "%s: addr=" MACSTR " mask=" MACSTR,
++ name, MAC2STR(addr),
++ MAC2STR(&addr[ETH_ALEN]));
++ }
++
++ pos = os_strchr(pos, ' ');
++ }
++
++ os_free(*list);
++ *list = buf;
++ *num = count;
++
++ return 0;
++}
++
++
++#ifndef NO_CONFIG_WRITE
++static char * wpa_config_write_addr_list(const struct parse_data *data,
++ const u8 *list, size_t num, char *name)
++{
++ char *value, *end, *pos;
++ int res;
++ size_t i;
++
++ if (list == NULL || num == 0)
++ return NULL;
++
++ value = os_malloc(2 * 20 * num);
++ if (value == NULL)
++ return NULL;
++ pos = value;
++ end = value + 2 * 20 * num;
++
++ for (i = num; i > 0; i--) {
++ const u8 *a = list + (i - 1) * 2 * ETH_ALEN;
++ const u8 *m = a + ETH_ALEN;
++
++ if (i < num)
++ *pos++ = ' ';
++ res = hwaddr_mask_txt(pos, end - pos, a, m);
++ if (res < 0) {
++ os_free(value);
++ return NULL;
++ }
++ pos += res;
++ }
++
++ return value;
++}
++#endif /* NO_CONFIG_WRITE */
++
+ static int wpa_config_parse_bssid(const struct parse_data *data,
+ struct wpa_ssid *ssid, int line,
+ const char *value)
+@@ -280,6 +373,50 @@ static char * wpa_config_write_bssid(const struct parse_data *data,
+ #endif /* NO_CONFIG_WRITE */
+
+
++static int wpa_config_parse_bssid_blacklist(const struct parse_data *data,
++ struct wpa_ssid *ssid, int line,
++ const char *value)
++{
++ return wpa_config_parse_addr_list(data, line, value,
++ &ssid->bssid_blacklist,
++ &ssid->num_bssid_blacklist,
++ "bssid_blacklist", 1, 1);
++}
++
++
++#ifndef NO_CONFIG_WRITE
++static char * wpa_config_write_bssid_blacklist(const struct parse_data *data,
++ struct wpa_ssid *ssid)
++{
++ return wpa_config_write_addr_list(data, ssid->bssid_blacklist,
++ ssid->num_bssid_blacklist,
++ "bssid_blacklist");
++}
++#endif /* NO_CONFIG_WRITE */
++
++
++static int wpa_config_parse_bssid_whitelist(const struct parse_data *data,
++ struct wpa_ssid *ssid, int line,
++ const char *value)
++{
++ return wpa_config_parse_addr_list(data, line, value,
++ &ssid->bssid_whitelist,
++ &ssid->num_bssid_whitelist,
++ "bssid_whitelist", 1, 1);
++}
++
++
++#ifndef NO_CONFIG_WRITE
++static char * wpa_config_write_bssid_whitelist(const struct parse_data *data,
++ struct wpa_ssid *ssid)
++{
++ return wpa_config_write_addr_list(data, ssid->bssid_whitelist,
++ ssid->num_bssid_whitelist,
++ "bssid_whitelist");
++}
++#endif /* NO_CONFIG_WRITE */
++
++
+ static int wpa_config_parse_psk(const struct parse_data *data,
+ struct wpa_ssid *ssid, int line,
+ const char *value)
+@@ -1435,53 +1572,10 @@ static int wpa_config_parse_p2p_client_list(const struct parse_data *data,
+ struct wpa_ssid *ssid, int line,
+ const char *value)
+ {
+- const char *pos;
+- u8 *buf, *n, addr[ETH_ALEN];
+- size_t count;
+-
+- buf = NULL;
+- count = 0;
+-
+- pos = value;
+- while (pos && *pos) {
+- while (*pos == ' ')
+- pos++;
+-
+- if (hwaddr_aton(pos, addr)) {
+- if (count == 0) {
+- wpa_printf(MSG_ERROR, "Line %d: Invalid "
+- "p2p_client_list address '%s'.",
+- line, value);
+- os_free(buf);
+- return -1;
+- }
+- /* continue anyway since this could have been from a
+- * truncated configuration file line */
+- wpa_printf(MSG_INFO, "Line %d: Ignore likely "
+- "truncated p2p_client_list address '%s'",
+- line, pos);
+- } else {
+- n = os_realloc_array(buf, count + 1, ETH_ALEN);
+- if (n == NULL) {
+- os_free(buf);
+- return -1;
+- }
+- buf = n;
+- os_memmove(buf + ETH_ALEN, buf, count * ETH_ALEN);
+- os_memcpy(buf, addr, ETH_ALEN);
+- count++;
+- wpa_hexdump(MSG_MSGDUMP, "p2p_client_list",
+- addr, ETH_ALEN);
+- }
+-
+- pos = os_strchr(pos, ' ');
+- }
+-
+- os_free(ssid->p2p_client_list);
+- ssid->p2p_client_list = buf;
+- ssid->num_p2p_clients = count;
+-
+- return 0;
++ return wpa_config_parse_addr_list(data, line, value,
++ &ssid->p2p_client_list,
++ &ssid->num_p2p_clients,
++ "p2p_client_list", 0, 0);
+ }
+
+
+@@ -1489,34 +1583,9 @@ static int wpa_config_parse_p2p_client_list(const struct parse_data *data,
+ static char * wpa_config_write_p2p_client_list(const struct parse_data *data,
+ struct wpa_ssid *ssid)
+ {
+- char *value, *end, *pos;
+- int res;
+- size_t i;
+-
+- if (ssid->p2p_client_list == NULL || ssid->num_p2p_clients == 0)
+- return NULL;
+-
+- value = os_malloc(20 * ssid->num_p2p_clients);
+- if (value == NULL)
+- return NULL;
+- pos = value;
+- end = value + 20 * ssid->num_p2p_clients;
+-
+- for (i = ssid->num_p2p_clients; i > 0; i--) {
+- res = os_snprintf(pos, end - pos, MACSTR " ",
+- MAC2STR(ssid->p2p_client_list +
+- (i - 1) * ETH_ALEN));
+- if (res < 0 || res >= end - pos) {
+- os_free(value);
+- return NULL;
+- }
+- pos += res;
+- }
+-
+- if (pos > value)
+- pos[-1] = '\0';
+-
+- return value;
++ return wpa_config_write_addr_list(data, ssid->p2p_client_list,
++ ssid->num_p2p_clients,
++ "p2p_client_list");
+ }
+ #endif /* NO_CONFIG_WRITE */
+
+@@ -1667,6 +1736,8 @@ static const struct parse_data ssid_fields[] = {
+ { STR_RANGE(ssid, 0, MAX_SSID_LEN) },
+ { INT_RANGE(scan_ssid, 0, 1) },
+ { FUNC(bssid) },
++ { FUNC(bssid_blacklist) },
++ { FUNC(bssid_whitelist) },
+ { FUNC_KEY(psk) },
+ { FUNC(proto) },
+ { FUNC(key_mgmt) },
+@@ -1971,6 +2042,8 @@ void wpa_config_free_ssid(struct wpa_ssid *ssid)
+ os_free(ssid->freq_list);
+ os_free(ssid->bgscan);
+ os_free(ssid->p2p_client_list);
++ os_free(ssid->bssid_blacklist);
++ os_free(ssid->bssid_whitelist);
+ #ifdef CONFIG_HT_OVERRIDES
+ os_free(ssid->ht_mcs);
+ #endif /* CONFIG_HT_OVERRIDES */
+diff --git a/wpa_supplicant/config_ssid.h b/wpa_supplicant/config_ssid.h
+index a4910d0..7443207 100644
+--- a/wpa_supplicant/config_ssid.h
++++ b/wpa_supplicant/config_ssid.h
+@@ -128,6 +128,18 @@ struct wpa_ssid {
+ u8 bssid[ETH_ALEN];
+
+ /**
++ * bssid_blacklist - List of inacceptable BSSIDs
++ */
++ u8 *bssid_blacklist;
++ size_t num_bssid_blacklist;
++
++ /**
++ * bssid_blacklist - List of acceptable BSSIDs
++ */
++ u8 *bssid_whitelist;
++ size_t num_bssid_whitelist;
++
++ /**
+ * bssid_set - Whether BSSID is configured for this network
+ */
+ int bssid_set;
+diff --git a/wpa_supplicant/events.c b/wpa_supplicant/events.c
+index 6761c1a..855653c 100644
+--- a/wpa_supplicant/events.c
++++ b/wpa_supplicant/events.c
+@@ -703,6 +703,33 @@ static int bss_is_ess(struct wpa_bss *bss)
+ }
+
+
++static int match_mac_mask(const u8 *addr_a, const u8 *addr_b, const u8 *mask)
++{
++ size_t i;
++
++ for (i = 0; i < ETH_ALEN; i++) {
++ if ((addr_a[i] & mask[i]) != (addr_b[i] & mask[i]))
++ return 0;
++ }
++ return 1;
++}
++
++
++static int addr_in_list(const u8 *addr, const u8 *list, size_t num)
++{
++ size_t i;
++
++ for (i = 0; i < num; i++) {
++ const u8 *a = list + i * ETH_ALEN * 2;
++ const u8 *m = a + ETH_ALEN;
++
++ if (match_mac_mask(a, addr, m))
++ return 1;
++ }
++ return 0;
++}
++
++
+ static struct wpa_ssid * wpa_scan_res_match(struct wpa_supplicant *wpa_s,
+ int i, struct wpa_bss *bss,
+ struct wpa_ssid *group,
+@@ -827,6 +854,24 @@ static struct wpa_ssid * wpa_scan_res_match(struct wpa_supplicant *wpa_s,
+ continue;
+ }
+
++ /* check blacklist */
++ if (ssid->num_bssid_blacklist &&
++ addr_in_list(bss->bssid, ssid->bssid_blacklist,
++ ssid->num_bssid_blacklist)) {
++ wpa_dbg(wpa_s, MSG_DEBUG,
++ " skip - BSSID blacklisted");
++ continue;
++ }
++
++ /* if there is a whitelist, only accept those APs */
++ if (ssid->num_bssid_whitelist &&
++ !addr_in_list(bss->bssid, ssid->bssid_whitelist,
++ ssid->num_bssid_whitelist)) {
++ wpa_dbg(wpa_s, MSG_DEBUG,
++ " skip - BSSID not in whitelist");
++ continue;
++ }
++
+ if (!wpa_supplicant_ssid_bss_match(wpa_s, ssid, bss))
+ continue;
+
+diff --git a/wpa_supplicant/p2p_supplicant.c b/wpa_supplicant/p2p_supplicant.c
+index 8cd43df..60dcb5d 100644
+--- a/wpa_supplicant/p2p_supplicant.c
++++ b/wpa_supplicant/p2p_supplicant.c
+@@ -831,7 +831,7 @@ static void wpas_p2p_add_persistent_group_client(struct wpa_supplicant *wpa_s,
+ return;
+
+ for (i = 0; s->p2p_client_list && i < s->num_p2p_clients; i++) {
+- if (os_memcmp(s->p2p_client_list + i * ETH_ALEN, addr,
++ if (os_memcmp(s->p2p_client_list + i * 2 * ETH_ALEN, addr,
+ ETH_ALEN) != 0)
+ continue;
+
+@@ -839,32 +839,42 @@ static void wpas_p2p_add_persistent_group_client(struct wpa_supplicant *wpa_s,
+ return; /* already the most recent entry */
+
+ /* move the entry to mark it most recent */
+- os_memmove(s->p2p_client_list + i * ETH_ALEN,
+- s->p2p_client_list + (i + 1) * ETH_ALEN,
+- (s->num_p2p_clients - i - 1) * ETH_ALEN);
++ os_memmove(s->p2p_client_list + i * 2 * ETH_ALEN,
++ s->p2p_client_list + (i + 1) * 2 * ETH_ALEN,
++ (s->num_p2p_clients - i - 1) * 2 * ETH_ALEN);
+ os_memcpy(s->p2p_client_list +
+- (s->num_p2p_clients - 1) * ETH_ALEN, addr, ETH_ALEN);
++ (s->num_p2p_clients - 1) * 2 * ETH_ALEN, addr,
++ ETH_ALEN);
++ os_memset(s->p2p_client_list +
++ (s->num_p2p_clients - 1) * 2 * ETH_ALEN + ETH_ALEN,
++ 0xff, ETH_ALEN);
+ found = 1;
+ break;
+ }
+
+ if (!found && s->num_p2p_clients < P2P_MAX_STORED_CLIENTS) {
+ n = os_realloc_array(s->p2p_client_list,
+- s->num_p2p_clients + 1, ETH_ALEN);
++ s->num_p2p_clients + 1, 2 * ETH_ALEN);
+ if (n == NULL)
+ return;
+- os_memcpy(n + s->num_p2p_clients * ETH_ALEN, addr, ETH_ALEN);
++ os_memcpy(n + s->num_p2p_clients * 2 * ETH_ALEN, addr,
++ ETH_ALEN);
++ os_memset(n + s->num_p2p_clients * 2 * ETH_ALEN + ETH_ALEN,
++ 0xff, ETH_ALEN);
+ s->p2p_client_list = n;
+ s->num_p2p_clients++;
+ } else if (!found && s->p2p_client_list) {
+ /* Not enough room for an additional entry - drop the oldest
+ * entry */
+ os_memmove(s->p2p_client_list,
+- s->p2p_client_list + ETH_ALEN,
+- (s->num_p2p_clients - 1) * ETH_ALEN);
++ s->p2p_client_list + 2 * ETH_ALEN,
++ (s->num_p2p_clients - 1) * 2 * ETH_ALEN);
+ os_memcpy(s->p2p_client_list +
+- (s->num_p2p_clients - 1) * ETH_ALEN,
++ (s->num_p2p_clients - 1) * 2 * ETH_ALEN,
+ addr, ETH_ALEN);
++ os_memset(s->p2p_client_list +
++ (s->num_p2p_clients - 1) * 2 * ETH_ALEN + ETH_ALEN,
++ 0xff, ETH_ALEN);
+ }
+
+ if (wpa_s->parent->conf->update_config &&
+@@ -3276,7 +3286,7 @@ static void wpas_remove_persistent_peer(struct wpa_supplicant *wpa_s,
+ return;
+
+ for (i = 0; ssid->p2p_client_list && i < ssid->num_p2p_clients; i++) {
+- if (os_memcmp(ssid->p2p_client_list + i * ETH_ALEN, peer,
++ if (os_memcmp(ssid->p2p_client_list + i * 2 * ETH_ALEN, peer,
+ ETH_ALEN) == 0)
+ break;
+ }
+@@ -3296,9 +3306,9 @@ static void wpas_remove_persistent_peer(struct wpa_supplicant *wpa_s,
+ "group %d client list%s",
+ MAC2STR(peer), ssid->id,
+ inv ? " due to invitation result" : "");
+- os_memmove(ssid->p2p_client_list + i * ETH_ALEN,
+- ssid->p2p_client_list + (i + 1) * ETH_ALEN,
+- (ssid->num_p2p_clients - i - 1) * ETH_ALEN);
++ os_memmove(ssid->p2p_client_list + i * 2 * ETH_ALEN,
++ ssid->p2p_client_list + (i + 1) * 2 * ETH_ALEN,
++ (ssid->num_p2p_clients - i - 1) * 2 * ETH_ALEN);
+ ssid->num_p2p_clients--;
+ if (wpa_s->parent->conf->update_config &&
+ wpa_config_write(wpa_s->parent->confname, wpa_s->parent->conf))
+@@ -6925,7 +6935,7 @@ struct wpa_ssid * wpas_p2p_get_persistent(struct wpa_supplicant *wpa_s,
+ if (s->mode != WPAS_MODE_P2P_GO || s->p2p_client_list == NULL)
+ continue;
+ for (i = 0; i < s->num_p2p_clients; i++) {
+- if (os_memcmp(s->p2p_client_list + i * ETH_ALEN,
++ if (os_memcmp(s->p2p_client_list + i * 2 * ETH_ALEN,
+ addr, ETH_ALEN) == 0)
+ return s; /* peer is P2P client in persistent
+ * group */
+diff --git a/wpa_supplicant/wpa_supplicant.conf b/wpa_supplicant/wpa_supplicant.conf
+index 0e8a28a..4bc08db 100644
+--- a/wpa_supplicant/wpa_supplicant.conf
++++ b/wpa_supplicant/wpa_supplicant.conf
+@@ -1408,6 +1408,21 @@ network={
+ key_mgmt=NONE
+ }
+
++# Example configuration blacklisting two APs - these will be ignored
++# for this network.
++network={
++ ssid="example"
++ psk="very secret passphrase"
++ bssid_blacklist=02:11:22:33:44:55 02:22:aa:44:55:66
++}
++
++# Example configuration limiting AP selection to a specific set of APs;
++# any other AP not matching the masked address will be ignored.
++network={
++ ssid="example"
++ psk="very secret passphrase"
++ bssid_whitelist=02:55:ae:bc:00:00/ff:ff:ff:ff:00:00 00:00:77:66:55:44/00:00:ff:ff:ff:ff
++}
+
+ # Example config file that will only scan on channel 36.
+ freq_list=5180
+--
+2.1.3
+
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