How we can get all physical interfaces in openwrt, I tried with ls -l /sys/class/net/, But it is not right information.

lrwxrwxrwx    1 root     root             0 Mar 21 10:26 eth0 -> ../../devices/virtual/net/eth0
lrwxrwxrwx    1 root     root             0 Mar 21 10:26 eth1 -> ../../devices/virtual/net/eth1
lrwxrwxrwx    1 root     root             0 Mar 21 10:26 tun0 -> ../../devices/virtual/net/tun0
lrwxrwxrwx    1 root     root             0 Mar 22 09:50 wlan0 -> ../../devices/pci0000:01/0000:01:00.0/net/wlan0
lrwxrwxrwx    1 root     root             0 Mar 22 09:50 wlan0-1 -> ../../devices/pci0000:01/0000:01:00.0/net/wlan0-1

actually eth0 and eth1 are physical and wlan0-1 is logical also.but the result shows differently.

Can anybody suggest a better way?