Netlink packet alignment purpose

[?ukasz Jachymczyk <lfx@xxxxxxx>]

Hello

Can you explain me the purpose of using alignments in packets (i.e. 
Netlink packets)?

I mean these macros

#define NLMSG_ALIGNTO   4
#define NLMSG_ALIGN(len) (((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )

and others from linux/netlink.h
They are used for separating headers from payload etc. but why?

Thanks


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