ospf_hdr_sanity_check
if ((l = ospf_hdr_sanity_check(ospf_hdr, len, iface, &dest)) == -1)
int ospf_hdr_sanity_check(struct ospf_hdr *, u_int16_t,
if ((l = ospf_hdr_sanity_check(&ip_hdr, ospf_hdr, len, iface)) == -1)
int ospf_hdr_sanity_check(const struct ip *,