Function cleanup_xaddrs_inet6

freebsd/net/rtsock.c:1456–1489

#ifdef INET6
static int
cleanup_xaddrs_inet6(struct rt_addrinfo *info)
{
	struct sockaddr_in6 *dst_sa, *mask_sa;
	struct in6_addr mask;

	/* Check & fixup dst/netmask combination first */
	dst_sa = (struct sockaddr_in6 *)info->rti_info[RTAX_DST];
	mask_sa = (struct sockaddr_in6 *)info->rti_info[RTAX_NETMASK];

	mask = mask_sa ? mask_sa->sin6_addr : in6mask128;
	IN6_MASK_ADDR(&dst_sa->sin6_addr, &mask);

	if (dst_sa->sin6_len < sizeof(struct sockaddr_in6)) {
		printf("dst sin6_len too small\n");
		return (EINVAL);
	}
	if (mask_sa && mask_sa->sin6_len < sizeof(struct sockaddr_in6)) {
		printf("mask sin6_len too small\n");
		return (EINVAL);
	}
	fill_sockaddr_inet6(dst_sa, &dst_sa->sin6_addr, 0);

	if (!IN6_ARE_ADDR_EQUAL(&mask, &in6mask128))
		fill_sockaddr_inet6(mask_sa, &mask, 0);
	else
		remove_netmask(info);

	/* Check gateway */
	if (info->rti_info[RTAX_GATEWAY] != NULL)
		return (cleanup_xaddrs_gateway(info));

	return (0);
}
#endif

static int