/*	$OpenBSD: in_pcb.c,v 1.64 2002/09/11 03:15:36 itojun Exp $	*/
/*	$NetBSD: in_pcb.c,v 1.25 1996/02/13 23:41:53 christos Exp $	*/

/*
 * Copyright (c) 1982, 1986, 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)COPYRIGHT	1.1 (NRL) 17 January 1995
 *
 * NRL grants permission for redistribution and use in source and binary
 * forms, with or without modification, of the software and documentation
 * created at NRL provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgements:
 * 	This product includes software developed by the University of
 * 	California, Berkeley and its contributors.
 * 	This product includes software developed at the Information
 * 	Technology Division, US Naval Research Laboratory.
 * 4. Neither the name of the NRL nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL AND CONTRIBUTORS ``AS
 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL NRL OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation
 * are those of the authors and should not be interpreted as representing
 * official policies, either expressed or implied, of the US Naval
 * Research Laboratory (NRL).
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/proc.h>
#include <sys/domain.h>

#include <net/if.h>
#include <net/route.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#ifndef __NetBSD__
#include <dev/rndvar.h>
#endif

#ifdef INET6
#include <netinet6/ip6_var.h>
#endif /* INET6 */

struct inpcb *
in_pcblookup(table, faddrp, fport_arg, laddrp, lport_arg, flags)
	struct inpcbtable *table;
	void *faddrp, *laddrp;
	u_int fport_arg, lport_arg;
	int flags;
{
	register struct inpcb *inp, *match = 0;
	int matchwild = 3, wildcard;
	u_int16_t fport = fport_arg, lport = lport_arg;
	struct in_addr faddr = *(struct in_addr *)faddrp;
	struct in_addr laddr = *(struct in_addr *)laddrp;

	for (inp = table->inpt_queue.cqh_first;
	    inp != (struct inpcb *)&table->inpt_queue;
	    inp = inp->inp_queue.cqe_next) {
		if (inp->inp_lport != lport)
			continue;
		wildcard = 0;
#ifdef INET6
		if (flags & INPLOOKUP_IPV6) {
			struct in6_addr *laddr6 = (struct in6_addr *)laddrp;
			struct in6_addr *faddr6 = (struct in6_addr *)faddrp;

			if (!(inp->inp_flags & INP_IPV6))
				continue;

			if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6)) {
				if (IN6_IS_ADDR_UNSPECIFIED(laddr6))
					wildcard++;
				else if (!IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, laddr6))
					continue;
			} else {
				if (!IN6_IS_ADDR_UNSPECIFIED(laddr6))
					wildcard++;
			}

			if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) {
				if (IN6_IS_ADDR_UNSPECIFIED(faddr6))
					wildcard++;
				else if (!IN6_ARE_ADDR_EQUAL(&inp->inp_faddr6,
				    faddr6) || inp->inp_fport != fport)
					continue;
			} else {
				if (!IN6_IS_ADDR_UNSPECIFIED(faddr6))
					wildcard++;
			}
		} else
#endif /* INET6 */
		{
#ifdef INET6
		        if (inp->inp_flags & INP_IPV6)
			        continue;
#endif /* INET6 */

			if (inp->inp_faddr.s_addr != INADDR_ANY) {
				if (faddr.s_addr == INADDR_ANY)
					wildcard++;
				else if (inp->inp_faddr.s_addr != faddr.s_addr ||
				    inp->inp_fport != fport)
					continue;
			} else {
				if (faddr.s_addr != INADDR_ANY)
					wildcard++;
			}
			if (inp->inp_laddr.s_addr != INADDR_ANY) {
				if (laddr.s_addr == INADDR_ANY)
					wildcard++;
				else if (inp->inp_laddr.s_addr != laddr.s_addr)
					continue;
			} else {
				if (laddr.s_addr != INADDR_ANY)
					wildcard++;
			}
		}
		if ((!wildcard || (flags & INPLOOKUP_WILDCARD)) &&
		    wildcard < matchwild) {
			match = inp;
			if ((matchwild = wildcard) == 0)
				break;
		}
	}
	return (match);
}