mac_ipv4_sap_verify
if (!mac_ipv4_sap_verify(sap, NULL, NULL))
mac_ipv4_sap_verify,
if (!mac_ipv4_sap_verify(sap, NULL, NULL))
mac_ipv4_sap_verify, /* same set of legal SAP values */
boolean_t mac_ipv4_sap_verify(uint32_t, uint32_t *, void *);