nl80211: handle per_sta_vif case properly

When per_sta_vif is enabled in hostapd BSS config, we need to iterate
through every interface in /sys/class/net which matches
`${interface_requested}.${number}`. Otherwise data we get will be
incomplete, similar cases are already handled for WDS so there is
precedence for this.

Closes openwrt/openwrt#14339

Signed-off-by: Rany Hany <[email protected]>

iwinfo_nl80211.c

@@ -153,6 +153,11 @@ static int nl80211_readstr(const char *path, char *buffer, int length)
 	return rv;
 }
 
+static bool nl80211_is_numeric(const char *str)
+{
+	return strlen(str) > 0 && strspn(str, "0123456789") == strlen(str);
+}
+
 static int nl80211_get_band(int nla_type)
 {
 	switch (nla_type)
@@ -1617,7 +1622,9 @@ static void nl80211_fill_signal(const char *ifname, struct nl80211_rssi_rate *r)
 		{
 			if (!strncmp(de->d_name, ifname, strlen(ifname)) &&
 			    (!de->d_name[strlen(ifname)] ||
-			     !strncmp(&de->d_name[strlen(ifname)], ".sta", 4)))
+			     !strncmp(&de->d_name[strlen(ifname)], ".sta", 4) ||
+			     (de->d_name[strlen(ifname)] == '.' &&
+			      nl80211_is_numeric(&de->d_name[strlen(ifname) + 1]))))
 			{
 				nl80211_request(de->d_name, NL80211_CMD_GET_STATION,
 				                NLM_F_DUMP, nl80211_fill_signal_cb, r);
@@ -2391,7 +2398,9 @@ static int nl80211_get_assoclist(const char *ifname, char *buf, int *len)
 		{
 			if (!strncmp(de->d_name, ifname, strlen(ifname)) &&
 			    (!de->d_name[strlen(ifname)] ||
-			     !strncmp(&de->d_name[strlen(ifname)], ".sta", 4)))
+			     !strncmp(&de->d_name[strlen(ifname)], ".sta", 4) ||
+			     (de->d_name[strlen(ifname)] == '.' &&
+			      nl80211_is_numeric(&de->d_name[strlen(ifname) + 1]))))
 			{
 				nl80211_request(de->d_name, NL80211_CMD_GET_STATION,
 				                NLM_F_DUMP, nl80211_get_assoclist_cb, &arr);