[apple/xnu.git] / bsd / netns / ns.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * 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. 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.
 *
 *	@(#)ns.c	8.2 (Berkeley) 11/15/93
 */

#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/ioctl.h>
#include <sys/protosw.h>
#include <sys/errno.h>
#include <sys/socket.h>
#include <sys/socketvar.h>

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

#include <netns/ns.h>
#include <netns/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;
	int error, 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 ((so->so_state & SS_PRIV) == 0)
		return (EPERM);

	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) {
//			oia = (struct ns_ifaddr *)
//				malloc(sizeof *ia, M_IFADDR, M_WAITOK);
			MALLOC(oia, struct ns_ifaddr *, sizeof *ia, M_IFADDR, M_WAITOK);
			if (oia == (struct ns_ifaddr *)NULL)
				return (ENOBUFS);
			bzero((caddr_t)oia, sizeof(*oia));
			if (ia = ns_ifaddr) {
				for ( ; ia->ia_next; ia = ia->ia_next)
					;
				ia->ia_next = oia;
			} else
				ns_ifaddr = oia;
			ia = oia;
			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");
		}
		IFAFREE((&oia->ia_ifa));
		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);
	}
	ia->ia_ifa.ifa_metric = ifp->if_metric;
	/*
	 * 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_addr.sns_addr.x_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_addr.sns_addr.x_net))
					ia_maybe = ia;
			} else {
				if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
					return (ia);
			}
		}
	}
	return (ia_maybe);
}
#endif
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* Copyright (c) 1984, 1985, 1986, 1987, 1993
	24	* The Regents of the University of California. All rights reserved.
	25	*
	26	* Redistribution and use in source and binary forms, with or without
	27	* modification, are permitted provided that the following conditions
	28	* are met:
	29	* 1. Redistributions of source code must retain the above copyright
	30	* notice, this list of conditions and the following disclaimer.
	31	* 2. Redistributions in binary form must reproduce the above copyright
	32	* notice, this list of conditions and the following disclaimer in the
	33	* documentation and/or other materials provided with the distribution.
	34	* 3. All advertising materials mentioning features or use of this software
	35	* must display the following acknowledgement:
	36	* This product includes software developed by the University of
	37	* California, Berkeley and its contributors.
	38	* 4. Neither the name of the University nor the names of its contributors
	39	* may be used to endorse or promote products derived from this software
	40	* without specific prior written permission.
	41	*
	42	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	43	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	44	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	45	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	46	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	47	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	48	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	49	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	50	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	51	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	52	* SUCH DAMAGE.
	53	*
	54	* @(#)ns.c 8.2 (Berkeley) 11/15/93
	55	*/
	56
	57	#include <sys/param.h>
	58	#include <sys/mbuf.h>
	59	#include <sys/ioctl.h>
	60	#include <sys/protosw.h>
	61	#include <sys/errno.h>
	62	#include <sys/socket.h>
	63	#include <sys/socketvar.h>
	64
65	#include <net/if.h>
66	#include <net/route.h>
67
68	#include <netns/ns.h>
69	#include <netns/ns_if.h>
70
71	#ifdef NS
72
73	struct ns_ifaddr *ns_ifaddr;
74	int ns_interfaces;
75	extern struct sockaddr_ns ns_netmask, ns_hostmask;
76
77	/*
78	* Generic internet control operations (ioctl's).
79	*/
80	/* ARGSUSED */
81	ns_control(so, cmd, data, ifp)
82	struct socket *so;
83	int cmd;
84	caddr_t data;
85	register struct ifnet *ifp;
86	{
87	register struct ifreq ifr = (struct ifreq )data;
88	register struct ns_aliasreq ifra = (struct ns_aliasreq )data;
89	register struct ns_ifaddr *ia;
90	struct ifaddr *ifa;
91	struct ns_ifaddr *oia;
92	int error, dstIsNew, hostIsNew;
93
94	/*
95	* Find address for this interface, if it exists.
96	*/
97	if (ifp == 0)
98	return (EADDRNOTAVAIL);
99	for (ia = ns_ifaddr; ia; ia = ia->ia_next)
100	if (ia->ia_ifp == ifp)
101	break;
102
103	switch (cmd) {
104
105	case SIOCGIFADDR:
106	if (ia == (struct ns_ifaddr *)0)
107	return (EADDRNOTAVAIL);
108	(struct sockaddr_ns )&ifr->ifr_addr = ia->ia_addr;
109	return (0);
110
111
112	case SIOCGIFBRDADDR:
113	if (ia == (struct ns_ifaddr *)0)
114	return (EADDRNOTAVAIL);
115	if ((ifp->if_flags & IFF_BROADCAST) == 0)
116	return (EINVAL);
117	(struct sockaddr_ns )&ifr->ifr_dstaddr = ia->ia_broadaddr;
118	return (0);
119
120	case SIOCGIFDSTADDR:
121	if (ia == (struct ns_ifaddr *)0)
122	return (EADDRNOTAVAIL);
123	if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
124	return (EINVAL);
125	(struct sockaddr_ns )&ifr->ifr_dstaddr = ia->ia_dstaddr;
126	return (0);
127	}
128
129	if ((so->so_state & SS_PRIV) == 0)
130	return (EPERM);
131
132	switch (cmd) {
133	case SIOCAIFADDR:
134	case SIOCDIFADDR:
135	if (ifra->ifra_addr.sns_family == AF_NS)
136	for (oia = ia; ia; ia = ia->ia_next) {
137	if (ia->ia_ifp == ifp &&
138	ns_neteq(ia->ia_addr.sns_addr,
139	ifra->ifra_addr.sns_addr))
140	break;
141	}
142	if (cmd == SIOCDIFADDR && ia == 0)
143	return (EADDRNOTAVAIL);
144	/* FALLTHROUGH */
145
146	case SIOCSIFADDR:
147	case SIOCSIFDSTADDR:
148	if (ia == (struct ns_ifaddr *)0) {
149	// oia = (struct ns_ifaddr *)
150	// malloc(sizeof *ia, M_IFADDR, M_WAITOK);
151	MALLOC(oia, struct ns_ifaddr , sizeof ia, M_IFADDR, M_WAITOK);
152	if (oia == (struct ns_ifaddr *)NULL)
153	return (ENOBUFS);
154	bzero((caddr_t)oia, sizeof(*oia));
155	if (ia = ns_ifaddr) {
156	for ( ; ia->ia_next; ia = ia->ia_next)
157	;
158	ia->ia_next = oia;
159	} else
160	ns_ifaddr = oia;
161	ia = oia;
162	if (ifa = ifp->if_addrlist) {
163	for ( ; ifa->ifa_next; ifa = ifa->ifa_next)
164	;
165	ifa->ifa_next = (struct ifaddr *) ia;
166	} else
167	ifp->if_addrlist = (struct ifaddr *) ia;
168	ia->ia_ifp = ifp;
169	ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
170
171	ia->ia_ifa.ifa_netmask =
172	(struct sockaddr *)&ns_netmask;
173
174	ia->ia_ifa.ifa_dstaddr =
175	(struct sockaddr *)&ia->ia_dstaddr;
176	if (ifp->if_flags & IFF_BROADCAST) {
177	ia->ia_broadaddr.sns_family = AF_NS;
178	ia->ia_broadaddr.sns_len = sizeof(ia->ia_addr);
179	ia->ia_broadaddr.sns_addr.x_host = ns_broadhost;
180	}
181	ns_interfaces++;
182	}
183	}
184
185	switch (cmd) {
186	int error;
187
188	case SIOCSIFDSTADDR:
189	if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
190	return (EINVAL);
191	if (ia->ia_flags & IFA_ROUTE) {
192	rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
193	ia->ia_flags &= ~IFA_ROUTE;
194	}
195	if (ifp->if_ioctl) {
196	error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, ia);
197	if (error)
198	return (error);
199	}
200	(struct sockaddr )&ia->ia_dstaddr = ifr->ifr_dstaddr;
201	return (0);
202
203	case SIOCSIFADDR:
204	return (ns_ifinit(ifp, ia,
205	(struct sockaddr_ns *)&ifr->ifr_addr, 1));
206
207	case SIOCDIFADDR:
208	ns_ifscrub(ifp, ia);
209	if ((ifa = ifp->if_addrlist) == (struct ifaddr *)ia)
210	ifp->if_addrlist = ifa->ifa_next;
211	else {
212	while (ifa->ifa_next &&
213	(ifa->ifa_next != (struct ifaddr *)ia))
214	ifa = ifa->ifa_next;
215	if (ifa->ifa_next)
216	ifa->ifa_next = ((struct ifaddr *)ia)->ifa_next;
217	else
218	printf("Couldn't unlink nsifaddr from ifp\n");
219	}
220	oia = ia;
221	if (oia == (ia = ns_ifaddr)) {
222	ns_ifaddr = ia->ia_next;
223	} else {
224	while (ia->ia_next && (ia->ia_next != oia)) {
225	ia = ia->ia_next;
226	}
227	if (ia->ia_next)
228	ia->ia_next = oia->ia_next;
229	else
230	printf("Didn't unlink nsifadr from list\n");
231	}
232	IFAFREE((&oia->ia_ifa));
233	if (0 == --ns_interfaces) {
234	/*
235	* We reset to virginity and start all over again
236	*/
237	ns_thishost = ns_zerohost;
238	}
239	return (0);
240
241	case SIOCAIFADDR:
242	dstIsNew = 0; hostIsNew = 1;
243	if (ia->ia_addr.sns_family == AF_NS) {
244	if (ifra->ifra_addr.sns_len == 0) {
245	ifra->ifra_addr = ia->ia_addr;
246	hostIsNew = 0;
247	} else if (ns_neteq(ifra->ifra_addr.sns_addr,
248	ia->ia_addr.sns_addr))
249	hostIsNew = 0;
250	}
251	if ((ifp->if_flags & IFF_POINTOPOINT) &&
252	(ifra->ifra_dstaddr.sns_family == AF_NS)) {
253	if (hostIsNew == 0)
254	ns_ifscrub(ifp, ia);
255	ia->ia_dstaddr = ifra->ifra_dstaddr;
256	dstIsNew = 1;
257	}
258	if (ifra->ifra_addr.sns_family == AF_NS &&
259	(hostIsNew \|\| dstIsNew))
260	error = ns_ifinit(ifp, ia, &ifra->ifra_addr, 0);
261	return (error);
262
263	default:
264	if (ifp->if_ioctl == 0)
265	return (EOPNOTSUPP);
266	return ((*ifp->if_ioctl)(ifp, cmd, data));
267	}
268	}
269
270	/*
271	* Delete any previous route for an old address.
272	*/
273	ns_ifscrub(ifp, ia)
274	register struct ifnet *ifp;
275	register struct ns_ifaddr *ia;
276	{
277	if (ia->ia_flags & IFA_ROUTE) {
278	if (ifp->if_flags & IFF_POINTOPOINT) {
279	rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
280	} else
281	rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
282	ia->ia_flags &= ~IFA_ROUTE;
283	}
284	}
285	/*
286	* Initialize an interface's internet address
287	* and routing table entry.
288	*/
289	ns_ifinit(ifp, ia, sns, scrub)
290	register struct ifnet *ifp;
291	register struct ns_ifaddr *ia;
292	register struct sockaddr_ns *sns;
293	{
294	struct sockaddr_ns oldaddr;
295	register union ns_host *h = &ia->ia_addr.sns_addr.x_host;
296	int s = splimp(), error;
297
298	/*
299	* Set up new addresses.
300	*/
301	oldaddr = ia->ia_addr;
302	ia->ia_addr = *sns;
303	/*
304	* The convention we shall adopt for naming is that
305	* a supplied address of zero means that "we don't care".
306	* if there is a single interface, use the address of that
307	* interface as our 6 byte host address.
308	* if there are multiple interfaces, use any address already
309	* used.
310	*
311	* Give the interface a chance to initialize
312	* if this is its first address,
313	* and to validate the address if necessary.
314	*/
315	if (ns_hosteqnh(ns_thishost, ns_zerohost)) {
316	if (ifp->if_ioctl &&
317	(error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, ia))) {
318	ia->ia_addr = oldaddr;
319	splx(s);
320	return (error);
321	}
322	ns_thishost = *h;
323	} else if (ns_hosteqnh(sns->sns_addr.x_host, ns_zerohost)
324	\|\| ns_hosteqnh(sns->sns_addr.x_host, ns_thishost)) {
325	*h = ns_thishost;
326	if (ifp->if_ioctl &&
327	(error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, ia))) {
328	ia->ia_addr = oldaddr;
329	splx(s);
330	return (error);
331	}
332	if (!ns_hosteqnh(ns_thishost,*h)) {
333	ia->ia_addr = oldaddr;
334	splx(s);
335	return (EINVAL);
336	}
337	} else {
338	ia->ia_addr = oldaddr;
339	splx(s);
340	return (EINVAL);
341	}
342	ia->ia_ifa.ifa_metric = ifp->if_metric;
343	/*
344	* Add route for the network.
345	*/
346	if (scrub) {
347	ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
348	ns_ifscrub(ifp, ia);
349	ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
350	}
351	if (ifp->if_flags & IFF_POINTOPOINT)
352	rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST\|RTF_UP);
353	else {
354	ia->ia_broadaddr.sns_addr.x_net = ia->ia_addr.sns_addr.x_net;
355	rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP);
356	}
357	ia->ia_flags \|= IFA_ROUTE;
358	return (0);
359	}
360
361	/*
362	* Return address info for specified internet network.
363	*/
364	struct ns_ifaddr *
365	ns_iaonnetof(dst)
366	register struct ns_addr *dst;
367	{
368	register struct ns_ifaddr *ia;
369	register struct ns_addr *compare;
370	register struct ifnet *ifp;
371	struct ns_ifaddr *ia_maybe = 0;
372	union ns_net net = dst->x_net;
373
374	for (ia = ns_ifaddr; ia; ia = ia->ia_next) {
375	if (ifp = ia->ia_ifp) {
376	if (ifp->if_flags & IFF_POINTOPOINT) {
377	compare = &satons_addr(ia->ia_dstaddr);
378	if (ns_hosteq(dst, compare))
379	return (ia);
380	if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
381	ia_maybe = ia;
382	} else {
383	if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
384	return (ia);
385	}
386	}
387	}
388	return (ia_maybe);
389	}
390	#endif