leon@witty:~/sandbox/efika/openembedded/build/tmp/deploy/uclibc/ipk/all$ ar xv hostap-conf_1.0-r8_all.ipk 
x - debian-binary
x - data.tar.gz
x - control.tar.gz

leon@witty:~/sandbox/efika/openembedded/build/tmp/deploy/uclibc/ipk/all$ tar xzvf control.tar.gz control
tar: control: Not found in archive
tar: Error exit delayed from previous errors

leon@witty:~/sandbox/efika/openembedded/build/tmp/deploy/uclibc/ipk/all$ tar xzvf control.tar.gz ./control
./control