1 #!/bin/sh 2 [ -f $KERNEL_DIR/net/ipv6/netfilter/ip6t_hbh.c -a -f $KERNEL_DIR/net/ipv6/netfilter/ip6t_dst.c -a -f $KERNEL_DIR/include/linux/netfilter_ipv6/ip6t_opts.h ] && echo hbh dst 3