/*	$OpenBSD: ipx_pcb.c,v 1.9 2003/06/02 23:28:16 millert Exp $	*/

/*-
 *
 * Copyright (c) 1996 Michael Shalayeff
 * Copyright (c) 1995, Mike Mitchell
 * Copyright (c) 1984, 1985, 1986, 1987, 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. 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.
 *
 *	@(#)ipx_pcb.c
 *
 * from FreeBSD Id: ipx_pcb.c,v 1.5 1996/03/11 15:13:53 davidg Exp
 */

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

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

#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
#include <netipx/ipx_pcb.h>

struct	ipx_addr zeroipx_addr;

#define	IPXPCBHASH(table, faddr, fport, laddr, lport) \
	&(table)->ipxpt_hashtbl[(ntohl((faddr)->ipx_net.l_net) + \
	ntohs((fport)) + ntohs((lport))) & (table->ipxpt_hash)]

void
ipx_pcbinit(table, hashsize)
	struct ipxpcbtable *table;
	int hashsize;
{
	CIRCLEQ_INIT(&table->ipxpt_queue);
	table->ipxpt_hashtbl =
	    hashinit(hashsize, M_PCB, M_WAITOK, &table->ipxpt_hash);
	table->ipxpt_lport = 0;
}

int
ipx_pcballoc(so, head)
	struct socket *so;
	struct ipxpcbtable *head;
{
	register struct ipxpcb *ipxp;
	int s;

	ipxp = malloc(sizeof(*ipxp), M_PCB, M_DONTWAIT);
	if (ipxp == NULL)
		return (ENOBUFS);
	bzero((caddr_t)ipxp, sizeof(*ipxp));
	ipxp->ipxp_socket = so;
	ipxp->ipxp_table = head;
	s = splnet();
	CIRCLEQ_INSERT_HEAD(&head->ipxpt_queue, ipxp, ipxp_queue);
	LIST_INSERT_HEAD(IPXPCBHASH(head, &ipxp->ipxp_faddr, ipxp->ipxp_fport,
	    &ipxp->ipxp_laddr, ipxp->ipxp_lport), ipxp, ipxp_hash);
	splx(s);
	so->so_pcb = (caddr_t)ipxp;
	return (0);
}
	
int
ipx_pcbbind(ipxp, nam)
	register struct ipxpcb *ipxp;
	struct mbuf *nam;
{
	register struct sockaddr_ipx *sipx;
	u_short lport = 0;

	if (ipxp->ipxp_lport || !ipx_nullhost(ipxp->ipxp_laddr))
		return (EINVAL);
	if (nam == 0)
		goto noname;
	sipx = mtod(nam, struct sockaddr_ipx *);
	if (nam->m_len != sizeof(*sipx))
		return (EINVAL);
	if (!ipx_nullhost(sipx->sipx_addr)) {
		int tport = sipx->sipx_port;

		sipx->sipx_port = 0;		/* yech... */
		if (ifa_ifwithaddr((struct sockaddr *)sipx) == 0)
			return (EADDRNOTAVAIL);
		sipx->sipx_port = tport;
	}
	lport = sipx->sipx_port;
	if (lport) {
		u_short aport = ntohs(lport);

		if (aport < IPXPORT_RESERVED &&
		    (ipxp->ipxp_socket->so_state & SS_PRIV) == 0)
			return (EACCES);
		if (ipx_pcblookup(&zeroipx_addr, lport, 0))
			return (EADDRINUSE);
	}
	ipxp->ipxp_laddr = sipx->sipx_addr;
noname:
	if (lport == 0)
		do {
			if ((ipxcbtable.ipxpt_lport++ < IPXPORT_RESERVED) ||
			    (ipxcbtable.ipxpt_lport >= IPXPORT_WELLKNOWN))
				ipxcbtable.ipxpt_lport = IPXPORT_RESERVED;
			lport = htons(ipxcbtable.ipxpt_lport);
		} while (ipx_pcblookup(&zeroipx_addr, lport, 0));
	ipxp->ipxp_lport = lport;
	return (0);
}

/*
 * Connect from a socket to a specified address.
 * Both address and port must be specified in argument sipx.
 * If don't have a local address for this socket yet,
 * then pick one.
 */
int
ipx_pcbconnect(ipxp, nam)
	struct ipxpcb *ipxp;
	struct mbuf *nam;
{
	struct ipx_ifaddr *ia;
	register struct sockaddr_ipx *sipx = mtod(nam, struct sockaddr_ipx *);
	register struct ipx_addr *dst;
	register struct route *ro;
	struct ifnet *ifp;

	if (nam->m_len != sizeof(*sipx))
		return (EINVAL);
	if (sipx->sipx_family != AF_IPX) {
#ifdef	DEBUG
		printf("ipx_connect: af=%x\n", sipx->sipx_family);
#endif
		return (EAFNOSUPPORT);
	}
	if (sipx->sipx_port==0 || ipx_nullhost(sipx->sipx_addr))
		return (EADDRNOTAVAIL);
	/*
	 * If we haven't bound which network number to use as ours,
	 * we will use the number of the outgoing interface.
	 * This depends on having done a routing lookup, which
	 * we will probably have to do anyway, so we might
	 * as well do it now.  On the other hand if we are
	 * sending to multiple destinations we may have already
	 * done the lookup, so see if we can use the route
	 * from before.  In any case, we only
	 * chose a port number once, even if sending to multiple
	 * destinations.
	 */
	ro = &ipxp->ipxp_route;
	dst = &satoipx_addr(ro->ro_dst);
	if (ipxp->ipxp_socket->so_options & SO_DONTROUTE)
		goto flush;
	if (!ipx_neteq(ipxp->ipxp_lastdst, sipx->sipx_addr))
		goto flush;
	if (!ipx_hosteq(ipxp->ipxp_lastdst, sipx->sipx_addr)) {
		if (ro->ro_rt && ! (ro->ro_rt->rt_flags & RTF_HOST)) {
			/* can patch route to avoid rtalloc */
			*dst = sipx->sipx_addr;
		} else {
	flush:
			if (ro->ro_rt)
				RTFREE(ro->ro_rt);
			ro->ro_rt = (struct rtentry *)0;
			ipxp->ipxp_laddr.ipx_net = ipx_zeronet;
		}
	}/* else cached route is ok; do nothing */
	ipxp->ipxp_lastdst = sipx->sipx_addr;
	if ((ipxp->ipxp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
	    (ro->ro_rt == (struct rtentry *)0 ||
	     ro->ro_rt->rt_ifp == (struct ifnet *)0)) {
		    /* No route yet, so try to acquire one */
		    ro->ro_dst.sa_family = AF_IPX;
		    ro->ro_dst.sa_len = sizeof(ro->ro_dst);
		    *dst = sipx->sipx_addr;
		    dst->ipx_port = 0;
		    rtalloc(ro);
	}
	if (ipx_neteqnn(ipxp->ipxp_laddr.ipx_net, ipx_zeronet)) {
		/* 
		 * If route is known or can be allocated now,
		 * our src addr is taken from the i/f, else punt.
		 */

		ia = (struct ipx_ifaddr *)0;
		/*
		 * If we found a route, use the address
		 * corresponding to the outgoing interface
		 */
		if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp))
			for (ia = ipx_ifaddr.tqh_first; ia;
			     ia = ia->ia_list.tqe_next)
				if (ia->ia_ifp == ifp)
					break;
		if (ia == NULL) {
			u_short fport = sipx->sipx_addr.ipx_port;
			sipx->sipx_addr.ipx_port = 0;
			ia = (struct ipx_ifaddr *)
				ifa_ifwithdstaddr((struct sockaddr *)sipx);
			sipx->sipx_addr.ipx_port = fport;
			if (ia == NULL)
				ia = ipx_iaonnetof(&sipx->sipx_addr);
			if (ia == NULL)
				ia = ipx_ifaddr.tqh_first;
			if (ia == 0)
				return (EADDRNOTAVAIL);
		}
		ipxp->ipxp_laddr.ipx_net = satoipx_addr(ia->ia_addr).ipx_net;
	}
	if (ipx_pcblookup(&sipx->sipx_addr, ipxp->ipxp_lport, 0))
		return (EADDRINUSE);
	if (ipxp->ipxp_lport == 0)
		(void) ipx_pcbbind(ipxp, (struct mbuf *)0);

	ipxp->ipxp_faddr = sipx->sipx_addr;
	/* Includes ipxp->ipxp_fport = sipx->sipx_port; */
	return (0);
}

void
ipx_pcbdisconnect(ipxp)
	struct ipxpcb *ipxp;
{

	ipxp->ipxp_faddr = zeroipx_addr;
	if (ipxp->ipxp_socket->so_state & SS_NOFDREF)
		ipx_pcbdetach(ipxp);
}

void
ipx_pcbdetach(ipxp)
	struct ipxpcb *ipxp;
{
	struct socket *so = ipxp->ipxp_socket;
	int	s;

	so->so_pcb = 0;
	sofree(so);
	if (ipxp->ipxp_route.ro_rt)
		rtfree(ipxp->ipxp_route.ro_rt);
	s = splnet();
	LIST_REMOVE(ipxp, ipxp_hash);
	CIRCLEQ_REMOVE(&ipxp->ipxp_table->ipxpt_queue, ipxp, ipxp_queue);
	splx(s);
	FREE(ipxp, M_PCB);
}

void
ipx_setsockaddr(ipxp, nam)
	register struct ipxpcb *ipxp;
	struct mbuf *nam;
{
	register struct sockaddr_ipx *sipx = mtod(nam, struct sockaddr_ipx *);
	
	nam->m_len = sizeof(*sipx);
	sipx = mtod(nam, struct sockaddr_ipx *);
	bzero((caddr_t)sipx, sizeof(*sipx));
	sipx->sipx_len = sizeof(*sipx);
	sipx->sipx_family = AF_IPX;
	sipx->sipx_addr = ipxp->ipxp_laddr;
}

void
ipx_setpeeraddr(ipxp, nam)
	register struct ipxpcb *ipxp;
	struct mbuf *nam;
{
	register struct sockaddr_ipx *sipx = mtod(nam, struct sockaddr_ipx *);
	
	nam->m_len = sizeof(*sipx);
	sipx = mtod(nam, struct sockaddr_ipx *);
	bzero((caddr_t)sipx, sizeof(*sipx));
	sipx->sipx_len = sizeof(*sipx);
	sipx->sipx_family = AF_IPX;
	sipx->sipx_addr = ipxp->ipxp_faddr;
}

/*
 * Pass some notification to all connections of a protocol
 * associated with address dst.  Call the
 * protocol specific routine to handle each connection.
 * Also pass an extra paramter via the ipxpcb. (which may in fact
 * be a parameter list!)
 */
void
ipx_pcbnotify(dst, errno, notify, param)
	register struct ipx_addr *dst;
	int errno;
	void (*notify)(struct ipxpcb *);
	long param;
{
	register struct ipxpcb *ipxp, *oinp;
	int s = splimp();

	for (ipxp = ipxcbtable.ipxpt_queue.cqh_first;
	    ipxp != (struct ipxpcb *)&ipxcbtable.ipxpt_queue;) {
		if (!ipx_hosteq(*dst,ipxp->ipxp_faddr)) {
	next:
			ipxp = ipxp->ipxp_queue.cqe_next;
			continue;
		}
		if (ipxp->ipxp_socket == 0)
			goto next;
		if (errno) 
			ipxp->ipxp_socket->so_error = errno;
		oinp = ipxp;
		ipxp = ipxp->ipxp_queue.cqe_next;
		oinp->ipxp_notify_param = param;
		(*notify)(oinp);
	}
	splx(s);
}

#ifdef notdef
/*
 * After a routing change, flush old routing
 * and allocate a (hopefully) better one.
 */
ipx_rtchange(ipxp)
	struct ipxpcb *ipxp;
{
	if (ipxp->ipxp_route.ro_rt) {
		rtfree(ipxp->ipxp_route.ro_rt);
		ipxp->ipxp_route.ro_rt = 0;
		/*
		 * A new route can be allocated the next time
		 * output is attempted.
		 */
	}
	/* SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */
}
#endif

struct ipxpcb *
ipx_pcblookup(faddr, lport, wildp)
	struct ipx_addr *faddr;
	u_short lport;
	int wildp;
{
	register struct ipxpcb *ipxp, *match = 0;
	int matchwild = 3, wildcard;
	u_short fport;

	fport = faddr->ipx_port;
	for (ipxp = ipxcbtable.ipxpt_queue.cqh_first;
	    ipxp != (struct ipxpcb *)&ipxcbtable.ipxpt_queue;
	    ipxp = ipxp->ipxp_queue.cqe_next) {
		if (ipxp->ipxp_lport != lport)
			continue;
		wildcard = 0;
		if (ipx_nullhost(ipxp->ipxp_faddr)) {
			if (!ipx_nullhost(*faddr))
				wildcard++;
		} else {
			if (ipx_nullhost(*faddr))
				wildcard++;
			else {
				if (!ipx_hosteq(ipxp->ipxp_faddr, *faddr))
					continue;
				if (ipxp->ipxp_fport != fport) {
					if (ipxp->ipxp_fport != 0)
						continue;
					else
						wildcard++;
				}
			}
		}
		if (wildcard && wildp==0)
			continue;
		if (wildcard < matchwild) {
			match = ipxp;
			matchwild = wildcard;
			if (wildcard == 0)
				break;
		}
	}
	return (match);
}