Helper for Routing Header (1)

size_t inet6_rth_space(int type, int segments);
- Return size required for routing header
struct cmsghdr *inet6_rth_init(void *bp,
- socklen_t bp_len,
- int type,
- int segments);
- Initialize buffer data for routing header
int inet6_rth_add(void *bp,
- const struct in6_addr *addr);
- Add one Ipv6 address to the routing header

size_t inet6_rth_space(int type, int segments);