ipx_usrreq.c revision 139587 
1/*
2 * Copyright (c) 2004 Robert N. M. Watson
3 * Copyright (c) 1995, Mike Mitchell
4 * Copyright (c) 1984, 1985, 1986, 1987, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 *	@(#)ipx_usrreq.c
36 */
37
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD: head/sys/netipx/ipx_usrreq.c 139587 2005-01-02 15:25:59Z rwatson $");
40
41#include "opt_ipx.h"
42
43#include <sys/param.h>
44#include <sys/kernel.h>
45#include <sys/lock.h>
46#include <sys/mbuf.h>
47#include <sys/protosw.h>
48#include <sys/signalvar.h>
49#include <sys/socket.h>
50#include <sys/socketvar.h>
51#include <sys/sx.h>
52#include <sys/sysctl.h>
53#include <sys/systm.h>
54
55#include <net/if.h>
56#include <net/route.h>
57
58#include <netinet/in.h>
59
60#include <netipx/ipx.h>
61#include <netipx/ipx_if.h>
62#include <netipx/ipx_ip.h>
63#include <netipx/ipx_pcb.h>
64#include <netipx/ipx_var.h>
65
66/*
67 * IPX protocol implementation.
68 */
69
70static int ipxsendspace = IPXSNDQ;
71SYSCTL_INT(_net_ipx_ipx, OID_AUTO, ipxsendspace, CTLFLAG_RW,
72            &ipxsendspace, 0, "");
73static int ipxrecvspace = IPXRCVQ;
74SYSCTL_INT(_net_ipx_ipx, OID_AUTO, ipxrecvspace, CTLFLAG_RW,
75            &ipxrecvspace, 0, "");
76
77static	int ipx_usr_abort(struct socket *so);
78static	int ipx_attach(struct socket *so, int proto, struct thread *td);
79static	int ipx_bind(struct socket *so, struct sockaddr *nam, struct thread *td);
80static	int ipx_connect(struct socket *so, struct sockaddr *nam,
81			struct thread *td);
82static	int ipx_detach(struct socket *so);
83static	int ipx_disconnect(struct socket *so);
84static	int ipx_send(struct socket *so, int flags, struct mbuf *m,
85		     struct sockaddr *addr, struct mbuf *control,
86		     struct thread *td);
87static	int ipx_shutdown(struct socket *so);
88static	int ripx_attach(struct socket *so, int proto, struct thread *td);
89static	int ipx_output(struct ipxpcb *ipxp, struct mbuf *m0);
90
91struct	pr_usrreqs ipx_usrreqs = {
92	.pru_abort =		ipx_usr_abort,
93	.pru_attach =		ipx_attach,
94	.pru_bind =		ipx_bind,
95	.pru_connect =		ipx_connect,
96	.pru_control =		ipx_control,
97	.pru_detach =		ipx_detach,
98	.pru_disconnect =	ipx_disconnect,
99	.pru_peeraddr =		ipx_peeraddr,
100	.pru_send =		ipx_send,
101	.pru_shutdown =		ipx_shutdown,
102	.pru_sockaddr =		ipx_sockaddr,
103};
104
105struct	pr_usrreqs ripx_usrreqs = {
106	.pru_abort =		ipx_usr_abort,
107	.pru_attach =		ripx_attach,
108	.pru_bind =		ipx_bind,
109	.pru_connect =		ipx_connect,
110	.pru_control =		ipx_control,
111	.pru_detach =		ipx_detach,
112	.pru_disconnect =	ipx_disconnect,
113	.pru_peeraddr =		ipx_peeraddr,
114	.pru_send =		ipx_send,
115	.pru_shutdown =		ipx_shutdown,
116	.pru_sockaddr =		ipx_sockaddr,
117};
118
119/*
120 *  This may also be called for raw listeners.
121 */
122void
123ipx_input(m, ipxp)
124	struct mbuf *m;
125	register struct ipxpcb *ipxp;
126{
127	register struct ipx *ipx = mtod(m, struct ipx *);
128	struct ifnet *ifp = m->m_pkthdr.rcvif;
129	struct sockaddr_ipx ipx_ipx;
130
131	KASSERT(ipxp != NULL, ("ipx_input: NUL ipxpcb"));
132	/*
133	 * Construct sockaddr format source address.
134	 * Stuff source address and datagram in user buffer.
135	 */
136	ipx_ipx.sipx_len = sizeof(ipx_ipx);
137	ipx_ipx.sipx_family = AF_IPX;
138	ipx_ipx.sipx_addr = ipx->ipx_sna;
139	ipx_ipx.sipx_zero[0] = '\0';
140	ipx_ipx.sipx_zero[1] = '\0';
141	if (ipx_neteqnn(ipx->ipx_sna.x_net, ipx_zeronet) && ifp != NULL) {
142		register struct ifaddr *ifa;
143
144		for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa != NULL;
145		     ifa = TAILQ_NEXT(ifa, ifa_link)) {
146			if (ifa->ifa_addr->sa_family == AF_IPX) {
147				ipx_ipx.sipx_addr.x_net =
148					IA_SIPX(ifa)->sipx_addr.x_net;
149				break;
150			}
151		}
152	}
153	ipxp->ipxp_rpt = ipx->ipx_pt;
154	if (!(ipxp->ipxp_flags & IPXP_RAWIN) ) {
155		m->m_len -= sizeof(struct ipx);
156		m->m_pkthdr.len -= sizeof(struct ipx);
157		m->m_data += sizeof(struct ipx);
158	}
159	if (sbappendaddr(&ipxp->ipxp_socket->so_rcv, (struct sockaddr *)&ipx_ipx,
160	    m, (struct mbuf *)NULL) == 0)
161		goto bad;
162	sorwakeup(ipxp->ipxp_socket);
163	return;
164bad:
165	m_freem(m);
166}
167
168void
169ipx_abort(ipxp)
170	struct ipxpcb *ipxp;
171{
172	struct socket *so = ipxp->ipxp_socket;
173
174	ipx_pcbdisconnect(ipxp);
175	soisdisconnected(so);
176}
177
178/*
179 * Drop connection, reporting
180 * the specified error.
181 */
182void
183ipx_drop(ipxp, errno)
184	register struct ipxpcb *ipxp;
185	int errno;
186{
187	struct socket *so = ipxp->ipxp_socket;
188
189	/*
190	 * someday, in the IPX world
191	 * we will generate error protocol packets
192	 * announcing that the socket has gone away.
193	 *
194	 * XXX Probably never. IPX does not have error packets.
195	 */
196	/*if (TCPS_HAVERCVDSYN(tp->t_state)) {
197		tp->t_state = TCPS_CLOSED;
198		tcp_output(tp);
199	}*/
200	so->so_error = errno;
201	ipx_pcbdisconnect(ipxp);
202	soisdisconnected(so);
203}
204
205static int
206ipx_output(ipxp, m0)
207	struct ipxpcb *ipxp;
208	struct mbuf *m0;
209{
210	register struct ipx *ipx;
211	register struct socket *so;
212	register int len = 0;
213	register struct route *ro;
214	struct mbuf *m;
215	struct mbuf *mprev = NULL;
216
217	/*
218	 * Calculate data length.
219	 */
220	for (m = m0; m != NULL; m = m->m_next) {
221		mprev = m;
222		len += m->m_len;
223	}
224	/*
225	 * Make sure packet is actually of even length.
226	 */
227
228	if (len & 1) {
229		m = mprev;
230		if ((m->m_flags & M_EXT) == 0 &&
231			(m->m_len + m->m_data < &m->m_dat[MLEN])) {
232			mtod(m, char*)[m->m_len++] = 0;
233		} else {
234			struct mbuf *m1 = m_get(M_DONTWAIT, MT_DATA);
235
236			if (m1 == NULL) {
237				m_freem(m0);
238				return (ENOBUFS);
239			}
240			m1->m_len = 1;
241			* mtod(m1, char *) = 0;
242			m->m_next = m1;
243		}
244		m0->m_pkthdr.len++;
245	}
246
247	/*
248	 * Fill in mbuf with extended IPX header
249	 * and addresses and length put into network format.
250	 */
251	m = m0;
252	if (ipxp->ipxp_flags & IPXP_RAWOUT) {
253		ipx = mtod(m, struct ipx *);
254	} else {
255		M_PREPEND(m, sizeof(struct ipx), M_DONTWAIT);
256		if (m == NULL)
257			return (ENOBUFS);
258		ipx = mtod(m, struct ipx *);
259		ipx->ipx_tc = 0;
260		ipx->ipx_pt = ipxp->ipxp_dpt;
261		ipx->ipx_sna = ipxp->ipxp_laddr;
262		ipx->ipx_dna = ipxp->ipxp_faddr;
263		len += sizeof(struct ipx);
264	}
265
266	ipx->ipx_len = htons((u_short)len);
267
268	if (ipxp->ipxp_flags & IPXP_CHECKSUM) {
269		ipx->ipx_sum = ipx_cksum(m, len);
270	} else
271		ipx->ipx_sum = 0xffff;
272
273	/*
274	 * Output datagram.
275	 */
276	so = ipxp->ipxp_socket;
277	if (so->so_options & SO_DONTROUTE)
278		return (ipx_outputfl(m, (struct route *)NULL,
279		    (so->so_options & SO_BROADCAST) | IPX_ROUTETOIF));
280	/*
281	 * Use cached route for previous datagram if
282	 * possible.  If the previous net was the same
283	 * and the interface was a broadcast medium, or
284	 * if the previous destination was identical,
285	 * then we are ok.
286	 *
287	 * NB: We don't handle broadcasts because that
288	 *     would require 3 subroutine calls.
289	 */
290	ro = &ipxp->ipxp_route;
291#ifdef ancient_history
292	/*
293	 * I think that this will all be handled in ipx_pcbconnect!
294	 */
295	if (ro->ro_rt != NULL) {
296		if(ipx_neteq(ipxp->ipxp_lastdst, ipx->ipx_dna)) {
297			/*
298			 * This assumes we have no GH type routes
299			 */
300			if (ro->ro_rt->rt_flags & RTF_HOST) {
301				if (!ipx_hosteq(ipxp->ipxp_lastdst, ipx->ipx_dna))
302					goto re_route;
303
304			}
305			if ((ro->ro_rt->rt_flags & RTF_GATEWAY) == 0) {
306				register struct ipx_addr *dst =
307						&satoipx_addr(ro->ro_dst);
308				dst->x_host = ipx->ipx_dna.x_host;
309			}
310			/*
311			 * Otherwise, we go through the same gateway
312			 * and dst is already set up.
313			 */
314		} else {
315		re_route:
316			RTFREE(ro->ro_rt);
317			ro->ro_rt = NULL;
318		}
319	}
320	ipxp->ipxp_lastdst = ipx->ipx_dna;
321#endif /* ancient_history */
322	return (ipx_outputfl(m, ro, so->so_options & SO_BROADCAST));
323}
324
325int
326ipx_ctloutput(so, sopt)
327	struct socket *so;
328	struct sockopt *sopt;
329{
330	struct ipxpcb *ipxp = sotoipxpcb(so);
331	int mask, error, optval;
332	short soptval;
333	struct ipx ioptval;
334
335	error = 0;
336	if (ipxp == NULL)
337		return (EINVAL);
338
339	switch (sopt->sopt_dir) {
340	case SOPT_GET:
341		switch (sopt->sopt_name) {
342		case SO_ALL_PACKETS:
343			mask = IPXP_ALL_PACKETS;
344			goto get_flags;
345
346		case SO_HEADERS_ON_INPUT:
347			mask = IPXP_RAWIN;
348			goto get_flags;
349
350		case SO_IPX_CHECKSUM:
351			mask = IPXP_CHECKSUM;
352			goto get_flags;
353
354		case SO_HEADERS_ON_OUTPUT:
355			mask = IPXP_RAWOUT;
356		get_flags:
357			soptval = ipxp->ipxp_flags & mask;
358			error = sooptcopyout(sopt, &soptval, sizeof soptval);
359			break;
360
361		case SO_DEFAULT_HEADERS:
362			ioptval.ipx_len = 0;
363			ioptval.ipx_sum = 0;
364			ioptval.ipx_tc = 0;
365			ioptval.ipx_pt = ipxp->ipxp_dpt;
366			ioptval.ipx_dna = ipxp->ipxp_faddr;
367			ioptval.ipx_sna = ipxp->ipxp_laddr;
368			error = sooptcopyout(sopt, &soptval, sizeof soptval);
369			break;
370
371		case SO_SEQNO:
372			error = sooptcopyout(sopt, &ipx_pexseq,
373					     sizeof ipx_pexseq);
374			ipx_pexseq++;
375			break;
376
377		default:
378			error = EINVAL;
379		}
380		break;
381
382	case SOPT_SET:
383		switch (sopt->sopt_name) {
384		case SO_ALL_PACKETS:
385			mask = IPXP_ALL_PACKETS;
386			goto set_head;
387
388		case SO_HEADERS_ON_INPUT:
389			mask = IPXP_RAWIN;
390			goto set_head;
391
392		case SO_IPX_CHECKSUM:
393			mask = IPXP_CHECKSUM;
394
395		case SO_HEADERS_ON_OUTPUT:
396			mask = IPXP_RAWOUT;
397		set_head:
398			error = sooptcopyin(sopt, &optval, sizeof optval,
399					    sizeof optval);
400			if (error)
401				break;
402			if (optval)
403				ipxp->ipxp_flags |= mask;
404			else
405				ipxp->ipxp_flags &= ~mask;
406			break;
407
408		case SO_DEFAULT_HEADERS:
409			error = sooptcopyin(sopt, &ioptval, sizeof ioptval,
410					    sizeof ioptval);
411			if (error)
412				break;
413			ipxp->ipxp_dpt = ioptval.ipx_pt;
414			break;
415#ifdef IPXIP
416		case SO_IPXIP_ROUTE:
417			error = ipxip_route(so, sopt);
418			break;
419#endif /* IPXIP */
420		default:
421			error = EINVAL;
422		}
423		break;
424	}
425	return (error);
426}
427
428static int
429ipx_usr_abort(so)
430	struct socket *so;
431{
432	int s;
433	struct ipxpcb *ipxp = sotoipxpcb(so);
434
435	s = splnet();
436	ipx_pcbdetach(ipxp);
437	splx(s);
438	soisdisconnected(so);
439	ACCEPT_LOCK();
440	SOCK_LOCK(so);
441	sotryfree(so);
442	return (0);
443}
444
445static int
446ipx_attach(so, proto, td)
447	struct socket *so;
448	int proto;
449	struct thread *td;
450{
451	int error;
452	int s;
453	struct ipxpcb *ipxp = sotoipxpcb(so);
454
455	if (ipxp != NULL)
456		return (EINVAL);
457	s = splnet();
458	error = ipx_pcballoc(so, &ipxpcb_list, td);
459	splx(s);
460	if (error == 0)
461		error = soreserve(so, ipxsendspace, ipxrecvspace);
462	return (error);
463}
464
465static int
466ipx_bind(so, nam, td)
467	struct socket *so;
468	struct sockaddr *nam;
469	struct thread *td;
470{
471	struct ipxpcb *ipxp = sotoipxpcb(so);
472
473	return (ipx_pcbbind(ipxp, nam, td));
474}
475
476static int
477ipx_connect(so, nam, td)
478	struct socket *so;
479	struct sockaddr *nam;
480	struct thread *td;
481{
482	int error;
483	int s;
484	struct ipxpcb *ipxp = sotoipxpcb(so);
485
486	if (!ipx_nullhost(ipxp->ipxp_faddr))
487		return (EISCONN);
488	s = splnet();
489	error = ipx_pcbconnect(ipxp, nam, td);
490	splx(s);
491	if (error == 0)
492		soisconnected(so);
493	return (error);
494}
495
496static int
497ipx_detach(so)
498	struct socket *so;
499{
500	int s;
501	struct ipxpcb *ipxp = sotoipxpcb(so);
502
503	if (ipxp == NULL)
504		return (ENOTCONN);
505	s = splnet();
506	ipx_pcbdetach(ipxp);
507	splx(s);
508	return (0);
509}
510
511static int
512ipx_disconnect(so)
513	struct socket *so;
514{
515	int s;
516	struct ipxpcb *ipxp = sotoipxpcb(so);
517
518	if (ipx_nullhost(ipxp->ipxp_faddr))
519		return (ENOTCONN);
520	s = splnet();
521	ipx_pcbdisconnect(ipxp);
522	splx(s);
523	soisdisconnected(so);
524	return (0);
525}
526
527int
528ipx_peeraddr(so, nam)
529	struct socket *so;
530	struct sockaddr **nam;
531{
532	struct ipxpcb *ipxp = sotoipxpcb(so);
533
534	ipx_setpeeraddr(ipxp, nam);
535	return (0);
536}
537
538static int
539ipx_send(so, flags, m, nam, control, td)
540	struct socket *so;
541	int flags;
542	struct mbuf *m;
543	struct sockaddr *nam;
544	struct mbuf *control;
545	struct thread *td;
546{
547	int error;
548	struct ipxpcb *ipxp = sotoipxpcb(so);
549	struct ipx_addr laddr;
550	int s = 0;
551
552	if (nam != NULL) {
553		laddr = ipxp->ipxp_laddr;
554		if (!ipx_nullhost(ipxp->ipxp_faddr)) {
555			error = EISCONN;
556			goto send_release;
557		}
558		/*
559		 * Must block input while temporarily connected.
560		 */
561		s = splnet();
562		error = ipx_pcbconnect(ipxp, nam, td);
563		if (error) {
564			splx(s);
565			goto send_release;
566		}
567	} else {
568		if (ipx_nullhost(ipxp->ipxp_faddr)) {
569			error = ENOTCONN;
570			goto send_release;
571		}
572	}
573	error = ipx_output(ipxp, m);
574	m = NULL;
575	if (nam != NULL) {
576		ipx_pcbdisconnect(ipxp);
577		splx(s);
578		ipxp->ipxp_laddr = laddr;
579	}
580
581send_release:
582	if (m != NULL)
583		m_freem(m);
584	return (error);
585}
586
587static int
588ipx_shutdown(so)
589	struct socket *so;
590{
591	socantsendmore(so);
592	return (0);
593}
594
595int
596ipx_sockaddr(so, nam)
597	struct socket *so;
598	struct sockaddr **nam;
599{
600	struct ipxpcb *ipxp = sotoipxpcb(so);
601
602	ipx_setsockaddr(ipxp, nam);
603	return (0);
604}
605
606static int
607ripx_attach(so, proto, td)
608	struct socket *so;
609	int proto;
610	struct thread *td;
611{
612	int error = 0;
613	int s;
614	struct ipxpcb *ipxp = sotoipxpcb(so);
615
616	if (td != NULL && (error = suser(td)) != 0)
617		return (error);
618	s = splnet();
619	error = ipx_pcballoc(so, &ipxrawpcb_list, td);
620	splx(s);
621	if (error)
622		return (error);
623	error = soreserve(so, ipxsendspace, ipxrecvspace);
624	if (error)
625		return (error);
626	ipxp = sotoipxpcb(so);
627	ipxp->ipxp_faddr.x_host = ipx_broadhost;
628	ipxp->ipxp_flags = IPXP_RAWIN | IPXP_RAWOUT;
629	return (error);
630}
631