Function in_pcblookup

freebsd/netinet/in_pcb.c:2660–2693

* Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf * from which a pre-calculated hash value may be extracted. * * Possibly more of this logic should be in in_pcbgroup.c. */

 * Possibly more of this logic should be in in_pcbgroup.c.
 */
struct inpcb *
in_pcblookup(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport,
    struct in_addr laddr, u_int lport, int lookupflags, struct ifnet *ifp)
{
#if defined(PCBGROUP) && !defined(RSS)
	struct inpcbgroup *pcbgroup;
#endif

	KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
	    ("%s: invalid lookup flags %d", __func__, lookupflags));
	KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
	    ("%s: LOCKPCB not set", __func__));

	/*
	 * When not using RSS, use connection groups in preference to the
	 * reservation table when looking up 4-tuples.  When using RSS, just
	 * use the reservation table, due to the cost of the Toeplitz hash
	 * in software.
	 *
	 * XXXRW: This policy belongs in the pcbgroup code, as in principle
	 * we could be doing RSS with a non-Toeplitz hash that is affordable
	 * in software.
	 */
#if defined(PCBGROUP) && !defined(RSS)
	if (in_pcbgroup_enabled(pcbinfo)) {
		pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
		    fport);
		return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
		    laddr, lport, lookupflags, ifp));
	}
#endif
	return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
	    lookupflags, ifp, M_NODOM));
}

struct inpcb *
in_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in_addr faddr,