Sending a netlink message

• Netlink message buffers are set up through macros from linux/netlink.h

• Find the length of the buffer using NLMSG_SPACE passing payload length

• Allocate a buffer. Setup nlmsghdr at beginning of buffer. Nlmsg_length is computed by NLMSG_LENGTH.

• Get a pointer to payload using NLMSG_DATA and set it up.