[apple/xnu.git] / bsd / netns / ns_ip.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_ip.c	8.1 (Berkeley) 6/10/93
 */

/*
 * Software interface driver for encapsulating ns in ip.
 */

#ifdef NSIP
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/protosw.h>

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

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>

#include <machine/mtpr.h>

#include <netns/ns.h>
#include <netns/ns_if.h>
#include <netns/idp.h>

struct ifnet_en {
	struct ifnet ifen_ifnet;
	struct route ifen_route;
	struct in_addr ifen_src;
	struct in_addr ifen_dst;
	struct ifnet_en *ifen_next;
};

int	nsipoutput(), nsipioctl(), nsipstart();
#define LOMTU	(1024+512);

struct ifnet nsipif;
struct ifnet_en *nsip_list;		/* list of all hosts and gateways or
					broadcast addrs */

struct ifnet_en *
nsipattach()
{
	register struct ifnet_en *m;
	register struct ifnet *ifp;

	if (nsipif.if_mtu == 0) {
		ifp = &nsipif;
		ifp->if_name = "nsip";
		ifp->if_mtu = LOMTU;
		ifp->if_ioctl = nsipioctl;
		ifp->if_output = nsipoutput;
		ifp->if_start = nsipstart;
		ifp->if_flags = IFF_POINTOPOINT;
	}

	MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_NOWAIT);
	if (m == NULL) return (NULL);
	m->ifen_next = nsip_list;
	nsip_list = m;
	ifp = &m->ifen_ifnet;

	ifp->if_name = "nsip";
	ifp->if_mtu = LOMTU;
	ifp->if_ioctl = nsipioctl;
	ifp->if_output = nsipoutput;
	ifp->if_start = nsipstart;
	ifp->if_flags = IFF_POINTOPOINT;
	ifp->if_unit = nsipif.if_unit++;
	if_attach(ifp);

	return (m);
}


/*
 * Process an ioctl request.
 */
/* ARGSUSED */
nsipioctl(ifp, cmd, data)
	register struct ifnet *ifp;
	int cmd;
	caddr_t data;
{
	int error = 0;
	struct ifreq *ifr;

	switch (cmd) {

	case SIOCSIFADDR:
		ifp->if_flags |= IFF_UP;
		/* fall into: */

	case SIOCSIFDSTADDR:
		/*
		 * Everything else is done at a higher level.
		 */
		break;

	case SIOCSIFFLAGS:
		ifr = (struct ifreq *)data;
		if ((ifr->ifr_flags & IFF_UP) == 0)
			error = nsip_free(ifp);


	default:
		error = EINVAL;
	}
	return (error);
}

struct mbuf *nsip_badlen;
struct mbuf *nsip_lastin;
int nsip_hold_input;

idpip_input(m, ifp)
	register struct mbuf *m;
	struct ifnet *ifp;
{
	register struct ip *ip;
	register struct idp *idp;
	register struct ifqueue *ifq = &nsintrq;
	int len, s;

	if (nsip_hold_input) {
		if (nsip_lastin) {
			m_freem(nsip_lastin);
		}
		nsip_lastin = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT);
	}
	/*
	 * Get IP and IDP header together in first mbuf.
	 */
	nsipif.if_ipackets++;
	s = sizeof (struct ip) + sizeof (struct idp);
	if (((m->m_flags & M_EXT) || m->m_len < s) &&
	    (m = m_pullup(m, s)) == 0) {
		nsipif.if_ierrors++;
		return;
	}
	ip = mtod(m, struct ip *);
	if (ip->ip_hl > (sizeof (struct ip) >> 2)) {
		ip_stripoptions(m, (struct mbuf *)0);
		if (m->m_len < s) {
			if ((m = m_pullup(m, s)) == 0) {
				nsipif.if_ierrors++;
				return;
			}
			ip = mtod(m, struct ip *);
		}
	}

	/*
	 * Make mbuf data length reflect IDP length.
	 * If not enough data to reflect IDP length, drop.
	 */
	m->m_data += sizeof (struct ip);
	m->m_len -= sizeof (struct ip);
	m->m_pkthdr.len -= sizeof (struct ip);
	idp = mtod(m, struct idp *);
	len = ntohs(idp->idp_len);
	if (len & 1) len++;		/* Preserve Garbage Byte */
	if (ip->ip_len != len) {
		if (len > ip->ip_len) {
			nsipif.if_ierrors++;
			if (nsip_badlen) m_freem(nsip_badlen);
			nsip_badlen = m;
			return;
		}
		/* Any extra will be trimmed off by the NS routines */
	}

	/*
	 * Place interface pointer before the data
	 * for the receiving protocol.
	 */
	m->m_pkthdr.rcvif = ifp;
	/*
	 * Deliver to NS
	 */
	s = splimp();
	if (IF_QFULL(ifq)) {
		IF_DROP(ifq);
bad:
		m_freem(m);
		splx(s);
		return;
	}
	IF_ENQUEUE(ifq, m);
	schednetisr(NETISR_NS);
	splx(s);
	return;
}

/* ARGSUSED */
nsipoutput(ifn, m, dst)
	struct ifnet_en *ifn;
	register struct mbuf *m;
	struct sockaddr *dst;
{

	register struct ip *ip;
	register struct route *ro = &(ifn->ifen_route);
	register int len = 0;
	register struct idp *idp = mtod(m, struct idp *);
	int error;

	ifn->ifen_ifnet.if_opackets++;
	nsipif.if_opackets++;


	/*
	 * Calculate data length and make space
	 * for IP header.
	 */
	len =  ntohs(idp->idp_len);
	if (len & 1) len++;		/* Preserve Garbage Byte */
	/* following clause not necessary on vax */
	if (3 & (int)m->m_data) {
		/* force longword alignment of ip hdr */
		struct mbuf *m0 = m_gethdr(MT_HEADER, M_DONTWAIT);
		if (m0 == 0) {
			m_freem(m);
			return (ENOBUFS);
		}
		MH_ALIGN(m0, sizeof (struct ip));
		m0->m_flags = m->m_flags & M_COPYFLAGS;
		m0->m_next = m;
		m0->m_len = sizeof (struct ip);
		m0->m_pkthdr.len = m0->m_len + m->m_len;
		m->m_flags &= ~M_PKTHDR;
	} else {
		M_PREPEND(m, sizeof (struct ip), M_DONTWAIT);
		if (m == 0)
			return (ENOBUFS);
	}
	/*
	 * Fill in IP header.
	 */
	ip = mtod(m, struct ip *);
	*(long *)ip = 0;
	ip->ip_p = IPPROTO_IDP;
	ip->ip_src = ifn->ifen_src;
	ip->ip_dst = ifn->ifen_dst;
	ip->ip_len = (u_short)len + sizeof (struct ip);
	ip->ip_ttl = MAXTTL;

	/*
	 * Output final datagram.
	 */
	error =  (ip_output(m, (struct mbuf *)0, ro, SO_BROADCAST, NULL));
	if (error) {
		ifn->ifen_ifnet.if_oerrors++;
		ifn->ifen_ifnet.if_ierrors = error;
	}
	return (error);
bad:
	m_freem(m);
	return (ENETUNREACH);
}

nsipstart(ifp)
struct ifnet *ifp;
{
	panic("nsip_start called\n");
}

struct ifreq ifr = {"nsip0"};

nsip_route(m)
	register struct mbuf *m;
{
	register struct nsip_req *rq = mtod(m, struct nsip_req *);
	struct sockaddr_ns *ns_dst = (struct sockaddr_ns *)&rq->rq_ns;
	struct sockaddr_in *ip_dst = (struct sockaddr_in *)&rq->rq_ip;
	struct route ro;
	struct ifnet_en *ifn;
	struct sockaddr_in *src;

	/*
	 * First, make sure we already have an ns address:
	 */
	if (ns_hosteqnh(ns_thishost, ns_zerohost))
		return (EADDRNOTAVAIL);
	/*
	 * Now, determine if we can get to the destination
	 */
	bzero((caddr_t)&ro, sizeof (ro));
	ro.ro_dst = *(struct sockaddr *)ip_dst;
	rtalloc(&ro);
	if (ro.ro_rt == 0 || ro.ro_rt->rt_ifp == 0) {
		return (ENETUNREACH);
	}

	/*
	 * And see how he's going to get back to us:
	 * i.e., what return ip address do we use?
	 */
	{
		register struct in_ifaddr *ia;
		struct ifnet *ifp = ro.ro_rt->rt_ifp;

		for (ia = in_ifaddr; ia; ia = ia->ia_next)
			if (ia->ia_ifp == ifp)
				break;
		if (ia == 0)
			ia = in_ifaddr;
		if (ia == 0) {
			RTFREE(ro.ro_rt);
			return (EADDRNOTAVAIL);
		}
		src = (struct sockaddr_in *)&ia->ia_addr;
	}

	/*
	 * Is there a free (pseudo-)interface or space?
	 */
	for (ifn = nsip_list; ifn; ifn = ifn->ifen_next) {
		if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
			break;
	}
	if (ifn == NULL)
		ifn = nsipattach();
	if (ifn == NULL) {
		RTFREE(ro.ro_rt);
		return (ENOBUFS);
	}
	ifn->ifen_route = ro;
	ifn->ifen_dst =  ip_dst->sin_addr;
	ifn->ifen_src = src->sin_addr;

	/*
	 * now configure this as a point to point link
	 */
	ifr.ifr_name[4] = '0' + nsipif.if_unit - 1;
	ifr.ifr_dstaddr = * (struct sockaddr *) ns_dst;
	(void)ns_control((struct socket *)0, (int)SIOCSIFDSTADDR, (caddr_t)&ifr,
			(struct ifnet *)ifn);
	satons_addr(ifr.ifr_addr).x_host = ns_thishost;
	return (ns_control((struct socket *)0, (int)SIOCSIFADDR, (caddr_t)&ifr,
			(struct ifnet *)ifn));
}

nsip_free(ifp)
struct ifnet *ifp;
{
	register struct ifnet_en *ifn = (struct ifnet_en *)ifp;
	struct route *ro = & ifn->ifen_route;

	if (ro->ro_rt) {
		RTFREE(ro->ro_rt);
		ro->ro_rt = 0;
	}
	ifp->if_flags &= ~IFF_UP;
	return (0);
}

nsip_ctlinput(cmd, sa)
	int cmd;
	struct sockaddr *sa;
{
	extern u_char inetctlerrmap[];
	struct sockaddr_in *sin;
	int in_rtchange();

	if ((unsigned)cmd >= PRC_NCMDS)
		return;
	if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
		return;
	sin = (struct sockaddr_in *)sa;
	if (sin->sin_addr.s_addr == INADDR_ANY)
		return;

	switch (cmd) {

	case PRC_ROUTEDEAD:
	case PRC_REDIRECT_NET:
	case PRC_REDIRECT_HOST:
	case PRC_REDIRECT_TOSNET:
	case PRC_REDIRECT_TOSHOST:
		nsip_rtchange(&sin->sin_addr);
		break;
	}
}

nsip_rtchange(dst)
	register struct in_addr *dst;
{
	register struct ifnet_en *ifn;

	for (ifn = nsip_list; ifn; ifn = ifn->ifen_next) {
		if (ifn->ifen_dst.s_addr == dst->s_addr &&
			ifn->ifen_route.ro_rt) {
				RTFREE(ifn->ifen_route.ro_rt);
				ifn->ifen_route.ro_rt = 0;
		}
	}
}
#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_ip.c 8.1 (Berkeley) 6/10/93
	55	*/
	56
	57	/*
	58	* Software interface driver for encapsulating ns in ip.
	59	*/
	60
	61	#ifdef NSIP
	62	#include <sys/param.h>
	63	#include <sys/systm.h>
	64	#include <sys/malloc.h>
65	#include <sys/mbuf.h>
66	#include <sys/socket.h>
67	#include <sys/socketvar.h>
68	#include <sys/errno.h>
69	#include <sys/ioctl.h>
70	#include <sys/protosw.h>
71
72	#include <net/if.h>
73	#include <net/netisr.h>
74	#include <net/route.h>
75
76	#include <netinet/in.h>
77	#include <netinet/in_systm.h>
78	#include <netinet/in_var.h>
79	#include <netinet/ip.h>
80	#include <netinet/ip_var.h>
81
82	#include <machine/mtpr.h>
83
84	#include <netns/ns.h>
85	#include <netns/ns_if.h>
86	#include <netns/idp.h>
87
88	struct ifnet_en {
89	struct ifnet ifen_ifnet;
90	struct route ifen_route;
91	struct in_addr ifen_src;
92	struct in_addr ifen_dst;
93	struct ifnet_en *ifen_next;
94	};
95
96	int nsipoutput(), nsipioctl(), nsipstart();
97	#define LOMTU (1024+512);
98
99	struct ifnet nsipif;
100	struct ifnet_en nsip_list; / list of all hosts and gateways or
101	broadcast addrs */
102
103	struct ifnet_en *
104	nsipattach()
105	{
106	register struct ifnet_en *m;
107	register struct ifnet *ifp;
108
109	if (nsipif.if_mtu == 0) {
110	ifp = &nsipif;
111	ifp->if_name = "nsip";
112	ifp->if_mtu = LOMTU;
113	ifp->if_ioctl = nsipioctl;
114	ifp->if_output = nsipoutput;
115	ifp->if_start = nsipstart;
116	ifp->if_flags = IFF_POINTOPOINT;
117	}
118
119	MALLOC((m), struct ifnet_en , sizeof(m), M_PCB, M_NOWAIT);
120	if (m == NULL) return (NULL);
121	m->ifen_next = nsip_list;
122	nsip_list = m;
123	ifp = &m->ifen_ifnet;
124
125	ifp->if_name = "nsip";
126	ifp->if_mtu = LOMTU;
127	ifp->if_ioctl = nsipioctl;
128	ifp->if_output = nsipoutput;
129	ifp->if_start = nsipstart;
130	ifp->if_flags = IFF_POINTOPOINT;
131	ifp->if_unit = nsipif.if_unit++;
132	if_attach(ifp);
133
134	return (m);
135	}
136
137
138	/*
139	* Process an ioctl request.
140	*/
141	/* ARGSUSED */
142	nsipioctl(ifp, cmd, data)
143	register struct ifnet *ifp;
144	int cmd;
145	caddr_t data;
146	{
147	int error = 0;
148	struct ifreq *ifr;
149
150	switch (cmd) {
151
152	case SIOCSIFADDR:
153	ifp->if_flags \|= IFF_UP;
154	/* fall into: */
155
156	case SIOCSIFDSTADDR:
157	/*
158	* Everything else is done at a higher level.
159	*/
160	break;
161
162	case SIOCSIFFLAGS:
163	ifr = (struct ifreq *)data;
164	if ((ifr->ifr_flags & IFF_UP) == 0)
165	error = nsip_free(ifp);
166
167
168	default:
169	error = EINVAL;
170	}
171	return (error);
172	}
173
174	struct mbuf *nsip_badlen;
175	struct mbuf *nsip_lastin;
176	int nsip_hold_input;
177
178	idpip_input(m, ifp)
179	register struct mbuf *m;
180	struct ifnet *ifp;
181	{
182	register struct ip *ip;
183	register struct idp *idp;
184	register struct ifqueue *ifq = &nsintrq;
185	int len, s;
186
187	if (nsip_hold_input) {
188	if (nsip_lastin) {
189	m_freem(nsip_lastin);
190	}
191	nsip_lastin = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT);
192	}
193	/*
194	* Get IP and IDP header together in first mbuf.
195	*/
196	nsipif.if_ipackets++;
197	s = sizeof (struct ip) + sizeof (struct idp);
198	if (((m->m_flags & M_EXT) \|\| m->m_len < s) &&
199	(m = m_pullup(m, s)) == 0) {
200	nsipif.if_ierrors++;
201	return;
202	}
203	ip = mtod(m, struct ip *);
204	if (ip->ip_hl > (sizeof (struct ip) >> 2)) {
205	ip_stripoptions(m, (struct mbuf *)0);
206	if (m->m_len < s) {
207	if ((m = m_pullup(m, s)) == 0) {
208	nsipif.if_ierrors++;
209	return;
210	}
211	ip = mtod(m, struct ip *);
212	}
213	}
214
215	/*
216	* Make mbuf data length reflect IDP length.
217	* If not enough data to reflect IDP length, drop.
218	*/
219	m->m_data += sizeof (struct ip);
220	m->m_len -= sizeof (struct ip);
221	m->m_pkthdr.len -= sizeof (struct ip);
222	idp = mtod(m, struct idp *);
223	len = ntohs(idp->idp_len);
224	if (len & 1) len++; /* Preserve Garbage Byte */
225	if (ip->ip_len != len) {
226	if (len > ip->ip_len) {
227	nsipif.if_ierrors++;
228	if (nsip_badlen) m_freem(nsip_badlen);
229	nsip_badlen = m;
230	return;
231	}
232	/* Any extra will be trimmed off by the NS routines */
233	}
234
235	/*
236	* Place interface pointer before the data
237	* for the receiving protocol.
238	*/
239	m->m_pkthdr.rcvif = ifp;
240	/*
241	* Deliver to NS
242	*/
243	s = splimp();
244	if (IF_QFULL(ifq)) {
245	IF_DROP(ifq);
246	bad:
247	m_freem(m);
248	splx(s);
249	return;
250	}
251	IF_ENQUEUE(ifq, m);
252	schednetisr(NETISR_NS);
253	splx(s);
254	return;
255	}
256
257	/* ARGSUSED */
258	nsipoutput(ifn, m, dst)
259	struct ifnet_en *ifn;
260	register struct mbuf *m;
261	struct sockaddr *dst;
262	{
263
264	register struct ip *ip;
265	register struct route *ro = &(ifn->ifen_route);
266	register int len = 0;
267	register struct idp idp = mtod(m, struct idp );
268	int error;
269
270	ifn->ifen_ifnet.if_opackets++;
271	nsipif.if_opackets++;
272
273
274	/*
275	* Calculate data length and make space
276	* for IP header.
277	*/
278	len = ntohs(idp->idp_len);
279	if (len & 1) len++; /* Preserve Garbage Byte */
280	/* following clause not necessary on vax */
281	if (3 & (int)m->m_data) {
282	/* force longword alignment of ip hdr */
283	struct mbuf *m0 = m_gethdr(MT_HEADER, M_DONTWAIT);
284	if (m0 == 0) {
285	m_freem(m);
286	return (ENOBUFS);
287	}
288	MH_ALIGN(m0, sizeof (struct ip));
289	m0->m_flags = m->m_flags & M_COPYFLAGS;
290	m0->m_next = m;
291	m0->m_len = sizeof (struct ip);
292	m0->m_pkthdr.len = m0->m_len + m->m_len;
293	m->m_flags &= ~M_PKTHDR;
294	} else {
295	M_PREPEND(m, sizeof (struct ip), M_DONTWAIT);
296	if (m == 0)
297	return (ENOBUFS);
298	}
299	/*
300	* Fill in IP header.
301	*/
302	ip = mtod(m, struct ip *);
303	(long )ip = 0;
304	ip->ip_p = IPPROTO_IDP;
305	ip->ip_src = ifn->ifen_src;
306	ip->ip_dst = ifn->ifen_dst;
307	ip->ip_len = (u_short)len + sizeof (struct ip);
308	ip->ip_ttl = MAXTTL;
309
310	/*
311	* Output final datagram.
312	*/
313	error = (ip_output(m, (struct mbuf *)0, ro, SO_BROADCAST, NULL));
314	if (error) {
315	ifn->ifen_ifnet.if_oerrors++;
316	ifn->ifen_ifnet.if_ierrors = error;
317	}
318	return (error);
319	bad:
320	m_freem(m);
321	return (ENETUNREACH);
322	}
323
324	nsipstart(ifp)
325	struct ifnet *ifp;
326	{
327	panic("nsip_start called\n");
328	}
329
330	struct ifreq ifr = {"nsip0"};
331
332	nsip_route(m)
333	register struct mbuf *m;
334	{
335	register struct nsip_req rq = mtod(m, struct nsip_req );
336	struct sockaddr_ns ns_dst = (struct sockaddr_ns )&rq->rq_ns;
337	struct sockaddr_in ip_dst = (struct sockaddr_in )&rq->rq_ip;
338	struct route ro;
339	struct ifnet_en *ifn;
340	struct sockaddr_in *src;
341
342	/*
343	* First, make sure we already have an ns address:
344	*/
345	if (ns_hosteqnh(ns_thishost, ns_zerohost))
346	return (EADDRNOTAVAIL);
347	/*
348	* Now, determine if we can get to the destination
349	*/
350	bzero((caddr_t)&ro, sizeof (ro));
351	ro.ro_dst = (struct sockaddr )ip_dst;
352	rtalloc(&ro);
353	if (ro.ro_rt == 0 \|\| ro.ro_rt->rt_ifp == 0) {
354	return (ENETUNREACH);
355	}
356
357	/*
358	* And see how he's going to get back to us:
359	* i.e., what return ip address do we use?
360	*/
361	{
362	register struct in_ifaddr *ia;
363	struct ifnet *ifp = ro.ro_rt->rt_ifp;
364
365	for (ia = in_ifaddr; ia; ia = ia->ia_next)
366	if (ia->ia_ifp == ifp)
367	break;
368	if (ia == 0)
369	ia = in_ifaddr;
370	if (ia == 0) {
371	RTFREE(ro.ro_rt);
372	return (EADDRNOTAVAIL);
373	}
374	src = (struct sockaddr_in *)&ia->ia_addr;
375	}
376
377	/*
378	* Is there a free (pseudo-)interface or space?
379	*/
380	for (ifn = nsip_list; ifn; ifn = ifn->ifen_next) {
381	if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
382	break;
383	}
384	if (ifn == NULL)
385	ifn = nsipattach();
386	if (ifn == NULL) {
387	RTFREE(ro.ro_rt);
388	return (ENOBUFS);
389	}
390	ifn->ifen_route = ro;
391	ifn->ifen_dst = ip_dst->sin_addr;
392	ifn->ifen_src = src->sin_addr;
393
394	/*
395	* now configure this as a point to point link
396	*/
397	ifr.ifr_name[4] = '0' + nsipif.if_unit - 1;
398	ifr.ifr_dstaddr = * (struct sockaddr *) ns_dst;
399	(void)ns_control((struct socket *)0, (int)SIOCSIFDSTADDR, (caddr_t)&ifr,
400	(struct ifnet *)ifn);
401	satons_addr(ifr.ifr_addr).x_host = ns_thishost;
402	return (ns_control((struct socket *)0, (int)SIOCSIFADDR, (caddr_t)&ifr,
403	(struct ifnet *)ifn));
404	}
405
406	nsip_free(ifp)
407	struct ifnet *ifp;
408	{
409	register struct ifnet_en ifn = (struct ifnet_en )ifp;
410	struct route *ro = & ifn->ifen_route;
411
412	if (ro->ro_rt) {
413	RTFREE(ro->ro_rt);
414	ro->ro_rt = 0;
415	}
416	ifp->if_flags &= ~IFF_UP;
417	return (0);
418	}
419
420	nsip_ctlinput(cmd, sa)
421	int cmd;
422	struct sockaddr *sa;
423	{
424	extern u_char inetctlerrmap[];
425	struct sockaddr_in *sin;
426	int in_rtchange();
427
428	if ((unsigned)cmd >= PRC_NCMDS)
429	return;
430	if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
431	return;
432	sin = (struct sockaddr_in *)sa;
433	if (sin->sin_addr.s_addr == INADDR_ANY)
434	return;
435
436	switch (cmd) {
437
438	case PRC_ROUTEDEAD:
439	case PRC_REDIRECT_NET:
440	case PRC_REDIRECT_HOST:
441	case PRC_REDIRECT_TOSNET:
442	case PRC_REDIRECT_TOSHOST:
443	nsip_rtchange(&sin->sin_addr);
444	break;
445	}
446	}
447
448	nsip_rtchange(dst)
449	register struct in_addr *dst;
450	{
451	register struct ifnet_en *ifn;
452
453	for (ifn = nsip_list; ifn; ifn = ifn->ifen_next) {
454	if (ifn->ifen_dst.s_addr == dst->s_addr &&
455	ifn->ifen_route.ro_rt) {
456	RTFREE(ifn->ifen_route.ro_rt);
457	ifn->ifen_route.ro_rt = 0;
458	}
459	}
460	}
461	#endif