[unix-history] / usr / src / sys / netns / ns.c

/*
 * Copyright (c) 1984, 1985, 1986, 1987 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *	@(#)ns.c	7.4 (Berkeley) %G%
 */

#include "param.h"
#include "mbuf.h"
#include "ioctl.h"
#include "protosw.h"
#include "socket.h"
#include "socketvar.h"
#include "uio.h"
#include "dir.h"
#include "user.h"


#include "../net/if.h"
#include "../net/route.h"
#include "../net/af.h"

#include "ns.h"
#include "ns_if.h"

#ifdef NS

struct ns_ifaddr *ns_ifaddr;
int ns_interfaces;
extern struct sockaddr_ns ns_netmask, ns_hostmask;

/*
 * Generic internet control operations (ioctl's).
 */
/* ARGSUSED */
ns_control(so, cmd, data, ifp)
	struct socket *so;
	int cmd;
	caddr_t data;
	register struct ifnet *ifp;
{
	register struct ifreq *ifr = (struct ifreq *)data;
	register struct ns_aliasreq *ifra = (struct ns_aliasreq *)data;
	register struct ns_ifaddr *ia;
	struct ifaddr *ifa;
	struct ns_ifaddr *oia;
	struct mbuf *m;
	int dstIsNew, hostIsNew;

	/*
	 * Find address for this interface, if it exists.
	 */
	if (ifp == 0)
		return (EADDRNOTAVAIL);
	for (ia = ns_ifaddr; ia; ia = ia->ia_next)
		if (ia->ia_ifp == ifp)
			break;

	switch (cmd) {

	case SIOCGIFADDR:
		if (ia == (struct ns_ifaddr *)0)
			return (EADDRNOTAVAIL);
		*(struct sockaddr_ns *)&ifr->ifr_addr = ia->ia_addr;
		return (0);


	case SIOCGIFBRDADDR:
		if (ia == (struct ns_ifaddr *)0)
			return (EADDRNOTAVAIL);
		if ((ifp->if_flags & IFF_BROADCAST) == 0)
			return (EINVAL);
		*(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_broadaddr;
		return (0);

	case SIOCGIFDSTADDR:
		if (ia == (struct ns_ifaddr *)0)
			return (EADDRNOTAVAIL);
		if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
			return (EINVAL);
		*(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_dstaddr;
		return (0);
	}

	if (!suser())
		return (u.u_error);

	switch (cmd) {
	case SIOCAIFADDR:
	case SIOCDIFADDR:
		if (ifra->ifra_addr.sns_family == AF_NS)
		    for (oia = ia; ia; ia = ia->ia_next) {
			if (ia->ia_ifp == ifp  &&
			    ns_neteq(ia->ia_addr.sns_addr,
				  ifra->ifra_addr.sns_addr))
			    break;
		    }
		if (cmd == SIOCDIFADDR && ia == 0)
			return (EADDRNOTAVAIL);
		/* FALLTHROUGH */

	case SIOCSIFADDR:
	case SIOCSIFDSTADDR:
		if (ia == (struct ns_ifaddr *)0) {
			m = m_getclr(M_WAIT, MT_IFADDR);
			if (m == (struct mbuf *)NULL)
				return (ENOBUFS);
			if (ia = ns_ifaddr) {
				for ( ; ia->ia_next; ia = ia->ia_next)
					;
				ia->ia_next = mtod(m, struct ns_ifaddr *);
			} else
				ns_ifaddr = mtod(m, struct ns_ifaddr *);
			ia = mtod(m, struct ns_ifaddr *);
			if (ifa = ifp->if_addrlist) {
				for ( ; ifa->ifa_next; ifa = ifa->ifa_next)
					;
				ifa->ifa_next = (struct ifaddr *) ia;
			} else
				ifp->if_addrlist = (struct ifaddr *) ia;
			ia->ia_ifp = ifp;
			ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;

			ia->ia_ifa.ifa_netmask =
				(struct sockaddr *)&ns_netmask;

			ia->ia_ifa.ifa_dstaddr =
				(struct sockaddr *)&ia->ia_dstaddr;
			if (ifp->if_flags & IFF_BROADCAST) {
				ia->ia_broadaddr.sns_family = AF_NS;
				ia->ia_broadaddr.sns_len = sizeof(ia->ia_addr);
				ia->ia_broadaddr.sns_addr.x_host = ns_broadhost;
			}
			ns_interfaces++;
		}
	}

	switch (cmd) {
		int error;

	case SIOCSIFDSTADDR:
		if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
			return (EINVAL);
		if (ia->ia_flags & IFA_ROUTE) {
			rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
			ia->ia_flags &= ~IFA_ROUTE;
		}
		if (ifp->if_ioctl) {
			error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, ia);
			if (error)
				return (error);
		}
		*(struct sockaddr *)&ia->ia_dstaddr = ifr->ifr_dstaddr;
		return (0);

	case SIOCSIFADDR:
		return (ns_ifinit(ifp, ia,
				(struct sockaddr_ns *)&ifr->ifr_addr, 1));

	case SIOCDIFADDR:
		ns_ifscrub(ifp, ia);
		if ((ifa = ifp->if_addrlist) == (struct ifaddr *)ia)
			ifp->if_addrlist = ifa->ifa_next;
		else {
			while (ifa->ifa_next &&
			       (ifa->ifa_next != (struct ifaddr *)ia))
				    ifa = ifa->ifa_next;
			if (ifa->ifa_next)
			    ifa->ifa_next = ((struct ifaddr *)ia)->ifa_next;
			else
				printf("Couldn't unlink nsifaddr from ifp\n");
		}
		oia = ia;
		if (oia == (ia = ns_ifaddr)) {
			ns_ifaddr = ia->ia_next;
		} else {
			while (ia->ia_next && (ia->ia_next != oia)) {
				ia = ia->ia_next;
			}
			if (ia->ia_next)
			    ia->ia_next = oia->ia_next;
			else
				printf("Didn't unlink nsifadr from list\n");
		}
		(void) m_free(dtom(oia));
		if (0 == --ns_interfaces) {
			/*
			 * We reset to virginity and start all over again
			 */
			ns_thishost = ns_zerohost;
		}
		return (0);
	
	case SIOCAIFADDR:
		dstIsNew = 0; hostIsNew = 1;
		if (ia->ia_addr.sns_family == AF_NS) {
			if (ifra->ifra_addr.sns_len == 0) {
				ifra->ifra_addr = ia->ia_addr;
				hostIsNew = 0;
			} else if (ns_neteq(ifra->ifra_addr.sns_addr,
					 ia->ia_addr.sns_addr))
				hostIsNew = 0;
		}
		if ((ifp->if_flags & IFF_POINTOPOINT) &&
		    (ifra->ifra_dstaddr.sns_family == AF_NS)) {
			if (hostIsNew == 0)
				ns_ifscrub(ifp, ia);
			ia->ia_dstaddr = ifra->ifra_dstaddr;
			dstIsNew  = 1;
		}
		if (ifra->ifra_addr.sns_family == AF_NS &&
					    (hostIsNew || dstIsNew))
			error = ns_ifinit(ifp, ia, &ifra->ifra_addr, 0);
		return (error);

	default:
		if (ifp->if_ioctl == 0)
			return (EOPNOTSUPP);
		return ((*ifp->if_ioctl)(ifp, cmd, data));
	}
}

/*
* Delete any previous route for an old address.
*/
ns_ifscrub(ifp, ia)
	register struct ifnet *ifp;
	register struct ns_ifaddr *ia; 
{
	if (ia->ia_flags & IFA_ROUTE) {
		if (ifp->if_flags & IFF_POINTOPOINT) {
			rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
		} else
			rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
		ia->ia_flags &= ~IFA_ROUTE;
	}
}
/*
 * Initialize an interface's internet address
 * and routing table entry.
 */
ns_ifinit(ifp, ia, sns, scrub)
	register struct ifnet *ifp;
	register struct ns_ifaddr *ia;
	register struct sockaddr_ns *sns;
{
	struct sockaddr_ns oldaddr;
	register union ns_host *h = &ia->ia_addr.sns_addr.x_host;
	int s = splimp(), error;

	/*
	 * Set up new addresses.
	 */
	oldaddr = ia->ia_addr;
	ia->ia_addr = *sns;
	/*
	 * The convention we shall adopt for naming is that
	 * a supplied address of zero means that "we don't care".
	 * if there is a single interface, use the address of that
	 * interface as our 6 byte host address.
	 * if there are multiple interfaces, use any address already
	 * used.
	 *
	 * Give the interface a chance to initialize
	 * if this is its first address,
	 * and to validate the address if necessary.
	 */
	if (ns_hosteqnh(ns_thishost, ns_zerohost)) {
		if (ifp->if_ioctl &&
		     (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, ia))) {
			ia->ia_addr = oldaddr;
			splx(s);
			return (error);
		}
		ns_thishost = *h;
	} else if (ns_hosteqnh(sns->sns_addr.x_host, ns_zerohost)
	    || ns_hosteqnh(sns->sns_addr.x_host, ns_thishost)) {
		*h = ns_thishost;
		if (ifp->if_ioctl &&
		     (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, ia))) {
			ia->ia_addr = oldaddr;
			splx(s);
			return (error);
		}
		if (!ns_hosteqnh(ns_thishost,*h)) {
			ia->ia_addr = oldaddr;
			splx(s);
			return (EINVAL);
		}
	} else {
		ia->ia_addr = oldaddr;
		splx(s);
		return (EINVAL);
	}
	/*
	 * Add route for the network.
	 */
	if (scrub) {
		ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
		ns_ifscrub(ifp, ia);
		ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
	}
	if (ifp->if_flags & IFF_POINTOPOINT)
		rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
	else {
		ia->ia_broadaddr.sns_addr.x_net = ia->ia_net;
		rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP);
	}
	ia->ia_flags |= IFA_ROUTE;
	return (0);
}

/*
 * Return address info for specified internet network.
 */
struct ns_ifaddr *
ns_iaonnetof(dst)
	register struct ns_addr *dst;
{
	register struct ns_ifaddr *ia;
	register struct ns_addr *compare;
	register struct ifnet *ifp;
	struct ns_ifaddr *ia_maybe = 0;
	union ns_net net = dst->x_net;

	for (ia = ns_ifaddr; ia; ia = ia->ia_next) {
		if (ifp = ia->ia_ifp) {
			if (ifp->if_flags & IFF_POINTOPOINT) {
				compare = &satons_addr(ia->ia_dstaddr);
				if (ns_hosteq(*dst, *compare))
					return (ia);
				if (ns_neteqnn(net, ia->ia_net))
					ia_maybe = ia;
			} else {
				if (ns_neteqnn(net, ia->ia_net))
					return (ia);
			}
		}
	}
	return (ia_maybe);
}
#endif
Commit	Line	Data
8ae0e4b4	1	/*
240edf1f KS	2	* Copyright (c) 1984, 1985, 1986, 1987 Regents of the University of California.
240edf1f KS	3	* All rights reserved.
8ae0e4b4	4	*
240edf1f	5	* Redistribution and use in source and binary forms are permitted
616d42db KB	6	* provided that the above copyright notice and this paragraph are
	7	* duplicated in all such forms and that any documentation,
	8	* advertising materials, and other materials related to such
	9	* distribution and use acknowledge that the software was developed
	10	* by the University of California, Berkeley. The name of the
	11	* University may not be used to endorse or promote products derived
	12	* from this software without specific prior written permission.
	13	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
	15	* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
240edf1f	16	*
4dcdd98e	17	* @(#)ns.c 7.4 (Berkeley) %G%
8ae0e4b4	18	*/
de9bc7de KS	19
	20	#include "param.h"
	21	#include "mbuf.h"
	22	#include "ioctl.h"
	23	#include "protosw.h"
	24	#include "socket.h"
	25	#include "socketvar.h"
	26	#include "uio.h"
	27	#include "dir.h"
	28	#include "user.h"
	29
	30
	31	#include "../net/if.h"
	32	#include "../net/route.h"
	33	#include "../net/af.h"
	34
	35	#include "ns.h"
	36	#include "ns_if.h"
	37
	38	#ifdef NS
	39
	40	struct ns_ifaddr *ns_ifaddr;
4dcdd98e KS	41	int ns_interfaces;
4dcdd98e KS	42	extern struct sockaddr_ns ns_netmask, ns_hostmask;
de9bc7de KS	43
	44	/*
	45	* Generic internet control operations (ioctl's).
	46	*/
f97be0c9	47	/* ARGSUSED */
de9bc7de KS	48	ns_control(so, cmd, data, ifp)
	49	struct socket *so;
	50	int cmd;
	51	caddr_t data;
	52	register struct ifnet *ifp;
	53	{
	54	register struct ifreq ifr = (struct ifreq )data;
4dcdd98e	55	register struct ns_aliasreq ifra = (struct ns_aliasreq )data;
de9bc7de KS	56	register struct ns_ifaddr *ia;
de9bc7de KS	57	struct ifaddr *ifa;
4dcdd98e	58	struct ns_ifaddr *oia;
de9bc7de	59	struct mbuf *m;
4dcdd98e	60	int dstIsNew, hostIsNew;
de9bc7de	61
de9bc7de KS	62	/*
	63	* Find address for this interface, if it exists.
	64	*/
8b659320	65	if (ifp == 0)
4353fa68	66	return (EADDRNOTAVAIL);
de9bc7de KS	67	for (ia = ns_ifaddr; ia; ia = ia->ia_next)
	68	if (ia->ia_ifp == ifp)
	69	break;
	70
	71	switch (cmd) {
	72
	73	case SIOCGIFADDR:
4353fa68 KS	74	if (ia == (struct ns_ifaddr *)0)
4353fa68 KS	75	return (EADDRNOTAVAIL);
4dcdd98e	76	(struct sockaddr_ns )&ifr->ifr_addr = ia->ia_addr;
4353fa68 KS	77	return (0);
	78
	79
de9bc7de	80	case SIOCGIFBRDADDR:
4353fa68 KS	81	if (ia == (struct ns_ifaddr *)0)
	82	return (EADDRNOTAVAIL);
	83	if ((ifp->if_flags & IFF_BROADCAST) == 0)
	84	return (EINVAL);
4dcdd98e	85	(struct sockaddr_ns )&ifr->ifr_dstaddr = ia->ia_broadaddr;
4353fa68 KS	86	return (0);
4353fa68 KS	87
de9bc7de KS	88	case SIOCGIFDSTADDR:
	89	if (ia == (struct ns_ifaddr *)0)
	90	return (EADDRNOTAVAIL);
4353fa68 KS	91	if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
4353fa68 KS	92	return (EINVAL);
4dcdd98e	93	(struct sockaddr_ns )&ifr->ifr_dstaddr = ia->ia_dstaddr;
4353fa68 KS	94	return (0);
	95	}
	96
	97	if (!suser())
	98	return (u.u_error);
	99
	100	switch (cmd) {
4dcdd98e KS	101	case SIOCAIFADDR:
	102	case SIOCDIFADDR:
	103	if (ifra->ifra_addr.sns_family == AF_NS)
	104	for (oia = ia; ia; ia = ia->ia_next) {
	105	if (ia->ia_ifp == ifp &&
	106	ns_neteq(ia->ia_addr.sns_addr,
	107	ifra->ifra_addr.sns_addr))
	108	break;
	109	}
	110	if (cmd == SIOCDIFADDR && ia == 0)
	111	return (EADDRNOTAVAIL);
	112	/* FALLTHROUGH */
de9bc7de	113
de9bc7de	114	case SIOCSIFADDR:
8b659320	115	case SIOCSIFDSTADDR:
de9bc7de KS	116	if (ia == (struct ns_ifaddr *)0) {
	117	m = m_getclr(M_WAIT, MT_IFADDR);
	118	if (m == (struct mbuf *)NULL)
	119	return (ENOBUFS);
	120	if (ia = ns_ifaddr) {
	121	for ( ; ia->ia_next; ia = ia->ia_next)
	122	;
	123	ia->ia_next = mtod(m, struct ns_ifaddr *);
	124	} else
	125	ns_ifaddr = mtod(m, struct ns_ifaddr *);
	126	ia = mtod(m, struct ns_ifaddr *);
	127	if (ifa = ifp->if_addrlist) {
	128	for ( ; ifa->ifa_next; ifa = ifa->ifa_next)
	129	;
	130	ifa->ifa_next = (struct ifaddr *) ia;
	131	} else
	132	ifp->if_addrlist = (struct ifaddr *) ia;
	133	ia->ia_ifp = ifp;
4dcdd98e KS	134	ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
	135
	136	ia->ia_ifa.ifa_netmask =
	137	(struct sockaddr *)&ns_netmask;
	138
	139	ia->ia_ifa.ifa_dstaddr =
	140	(struct sockaddr *)&ia->ia_dstaddr;
	141	if (ifp->if_flags & IFF_BROADCAST) {
	142	ia->ia_broadaddr.sns_family = AF_NS;
	143	ia->ia_broadaddr.sns_len = sizeof(ia->ia_addr);
	144	ia->ia_broadaddr.sns_addr.x_host = ns_broadhost;
	145	}
	146	ns_interfaces++;
de9bc7de	147	}
8b659320 KS	148	}
	149
	150	switch (cmd) {
4dcdd98e	151	int error;
8b659320 KS	152
	153	case SIOCSIFDSTADDR:
	154	if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
	155	return (EINVAL);
	156	if (ia->ia_flags & IFA_ROUTE) {
4dcdd98e	157	rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
8b659320 KS	158	ia->ia_flags &= ~IFA_ROUTE;
	159	}
	160	if (ifp->if_ioctl) {
4dcdd98e	161	error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, ia);
8b659320 KS	162	if (error)
	163	return (error);
	164	}
4dcdd98e	165	(struct sockaddr )&ia->ia_dstaddr = ifr->ifr_dstaddr;
8b659320 KS	166	return (0);
	167
	168	case SIOCSIFADDR:
4dcdd98e KS	169	return (ns_ifinit(ifp, ia,
	170	(struct sockaddr_ns *)&ifr->ifr_addr, 1));
	171
	172	case SIOCDIFADDR:
	173	ns_ifscrub(ifp, ia);
	174	if ((ifa = ifp->if_addrlist) == (struct ifaddr *)ia)
	175	ifp->if_addrlist = ifa->ifa_next;
	176	else {
	177	while (ifa->ifa_next &&
	178	(ifa->ifa_next != (struct ifaddr *)ia))
	179	ifa = ifa->ifa_next;
	180	if (ifa->ifa_next)
	181	ifa->ifa_next = ((struct ifaddr *)ia)->ifa_next;
	182	else
	183	printf("Couldn't unlink nsifaddr from ifp\n");
	184	}
	185	oia = ia;
	186	if (oia == (ia = ns_ifaddr)) {
	187	ns_ifaddr = ia->ia_next;
	188	} else {
	189	while (ia->ia_next && (ia->ia_next != oia)) {
	190	ia = ia->ia_next;
	191	}
	192	if (ia->ia_next)
	193	ia->ia_next = oia->ia_next;
	194	else
	195	printf("Didn't unlink nsifadr from list\n");
	196	}
	197	(void) m_free(dtom(oia));
	198	if (0 == --ns_interfaces) {
	199	/*
	200	* We reset to virginity and start all over again
	201	*/
	202	ns_thishost = ns_zerohost;
	203	}
	204	return (0);
	205
	206	case SIOCAIFADDR:
	207	dstIsNew = 0; hostIsNew = 1;
	208	if (ia->ia_addr.sns_family == AF_NS) {
	209	if (ifra->ifra_addr.sns_len == 0) {
	210	ifra->ifra_addr = ia->ia_addr;
	211	hostIsNew = 0;
	212	} else if (ns_neteq(ifra->ifra_addr.sns_addr,
	213	ia->ia_addr.sns_addr))
	214	hostIsNew = 0;
	215	}
	216	if ((ifp->if_flags & IFF_POINTOPOINT) &&
	217	(ifra->ifra_dstaddr.sns_family == AF_NS)) {
	218	if (hostIsNew == 0)
	219	ns_ifscrub(ifp, ia);
	220	ia->ia_dstaddr = ifra->ifra_dstaddr;
	221	dstIsNew = 1;
	222	}
	223	if (ifra->ifra_addr.sns_family == AF_NS &&
	224	(hostIsNew \|\| dstIsNew))
	225	error = ns_ifinit(ifp, ia, &ifra->ifra_addr, 0);
	226	return (error);
de9bc7de KS	227
	228	default:
	229	if (ifp->if_ioctl == 0)
	230	return (EOPNOTSUPP);
	231	return ((*ifp->if_ioctl)(ifp, cmd, data));
	232	}
de9bc7de KS	233	}
de9bc7de KS	234
4dcdd98e KS	235	/*
	236	* Delete any previous route for an old address.
	237	*/
	238	ns_ifscrub(ifp, ia)
	239	register struct ifnet *ifp;
	240	register struct ns_ifaddr *ia;
	241	{
	242	if (ia->ia_flags & IFA_ROUTE) {
	243	if (ifp->if_flags & IFF_POINTOPOINT) {
	244	rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
	245	} else
	246	rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
	247	ia->ia_flags &= ~IFA_ROUTE;
	248	}
	249	}
de9bc7de KS	250	/*
	251	* Initialize an interface's internet address
	252	* and routing table entry.
	253	*/
4dcdd98e	254	ns_ifinit(ifp, ia, sns, scrub)
de9bc7de KS	255	register struct ifnet *ifp;
de9bc7de KS	256	register struct ns_ifaddr *ia;
4dcdd98e	257	register struct sockaddr_ns *sns;
de9bc7de	258	{
4dcdd98e KS	259	struct sockaddr_ns oldaddr;
4dcdd98e KS	260	register union ns_host *h = &ia->ia_addr.sns_addr.x_host;
de9bc7de KS	261	int s = splimp(), error;
de9bc7de KS	262
4dcdd98e KS	263	/*
	264	* Set up new addresses.
	265	*/
	266	oldaddr = ia->ia_addr;
	267	ia->ia_addr = *sns;
de9bc7de KS	268	/*
	269	* The convention we shall adopt for naming is that
	270	* a supplied address of zero means that "we don't care".
	271	* if there is a single interface, use the address of that
	272	* interface as our 6 byte host address.
	273	* if there are multiple interfaces, use any address already
	274	* used.
	275	*
de9bc7de KS	276	* Give the interface a chance to initialize
	277	* if this is its first address,
	278	* and to validate the address if necessary.
	279	*/
de9bc7de KS	280	if (ns_hosteqnh(ns_thishost, ns_zerohost)) {
	281	if (ifp->if_ioctl &&
	282	(error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, ia))) {
4dcdd98e	283	ia->ia_addr = oldaddr;
de9bc7de KS	284	splx(s);
	285	return (error);
	286	}
	287	ns_thishost = *h;
	288	} else if (ns_hosteqnh(sns->sns_addr.x_host, ns_zerohost)
	289	\|\| ns_hosteqnh(sns->sns_addr.x_host, ns_thishost)) {
	290	*h = ns_thishost;
	291	if (ifp->if_ioctl &&
	292	(error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, ia))) {
4dcdd98e	293	ia->ia_addr = oldaddr;
de9bc7de KS	294	splx(s);
	295	return (error);
	296	}
8b659320	297	if (!ns_hosteqnh(ns_thishost,*h)) {
4dcdd98e	298	ia->ia_addr = oldaddr;
de9bc7de KS	299	splx(s);
	300	return (EINVAL);
	301	}
	302	} else {
4dcdd98e	303	ia->ia_addr = oldaddr;
de9bc7de	304	splx(s);
8b659320	305	return (EINVAL);
de9bc7de KS	306	}
	307	/*
	308	* Add route for the network.
	309	*/
4dcdd98e KS	310	if (scrub) {
	311	ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
	312	ns_ifscrub(ifp, ia);
	313	ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
	314	}
8b659320	315	if (ifp->if_flags & IFF_POINTOPOINT)
4dcdd98e KS	316	rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST\|RTF_UP);
	317	else {
	318	ia->ia_broadaddr.sns_addr.x_net = ia->ia_net;
	319	rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP);
	320	}
de9bc7de	321	ia->ia_flags \|= IFA_ROUTE;
8b659320	322	return (0);
de9bc7de KS	323	}
	324
	325	/*
	326	* Return address info for specified internet network.
	327	*/
	328	struct ns_ifaddr *
46aa06a9 KS	329	ns_iaonnetof(dst)
46aa06a9 KS	330	register struct ns_addr *dst;
de9bc7de KS	331	{
de9bc7de KS	332	register struct ns_ifaddr *ia;
46aa06a9	333	register struct ns_addr *compare;
8b659320 KS	334	register struct ifnet *ifp;
8b659320 KS	335	struct ns_ifaddr *ia_maybe = 0;
f1e269d4	336	union ns_net net = dst->x_net;
de9bc7de	337
46aa06a9	338	for (ia = ns_ifaddr; ia; ia = ia->ia_next) {
8b659320 KS	339	if (ifp = ia->ia_ifp) {
	340	if (ifp->if_flags & IFF_POINTOPOINT) {
	341	compare = &satons_addr(ia->ia_dstaddr);
	342	if (ns_hosteq(dst, compare))
	343	return (ia);
f1e269d4	344	if (ns_neteqnn(net, ia->ia_net))
8b659320 KS	345	ia_maybe = ia;
8b659320 KS	346	} else {
f1e269d4	347	if (ns_neteqnn(net, ia->ia_net))
46aa06a9 KS	348	return (ia);
	349	}
	350	}
	351	}
	352	return (ia_maybe);
de9bc7de KS	353	}
de9bc7de KS	354	#endif