Building Kernel Module Against: Can not find kernel header for function

Question

I have kernel modules which are built against kernel version 2.6.18. My task is to build the modules against kernel version 2.6.32.

The problem is that make command results in implicit declaration of function ‘MULTICAST’ error. I inspected the code and the code fragment which gives the error is as shown below:

MULTICAST( pkt_iph->daddr ) 

where "pkt_iph" is of type "struct iphdr". MULTICAST is defined in /linux/in.h as:

#define MULTICAST(x) (((x) & htonl(0xf0000000)) == htonl(0xe0000000))

for kernel version 2.6.18. How can I replace it for 2.6.32 or is there any other solution that you could provide?

Answer 1

It's replaced by IN_MULTICAST(), also in linux/in.h