ddp_usrreq.c revision 69781 
1/*
2 * Copyright (c) 1990,1994 Regents of The University of Michigan.
3 * All Rights Reserved.  See COPYRIGHT.
4 *
5 * $FreeBSD: head/sys/netatalk/ddp_usrreq.c 69781 2000-12-08 21:51:06Z dwmalone $
6 */
7
8#include <sys/param.h>
9#include <sys/systm.h>
10#include <sys/malloc.h>
11#include <sys/mbuf.h>
12#include <sys/socket.h>
13#include <sys/socketvar.h>
14#include <sys/protosw.h>
15#include <net/if.h>
16#include <net/route.h>
17
18#include <netatalk/at.h>
19#include <netatalk/at_var.h>
20#include <netatalk/ddp_var.h>
21#include <netatalk/at_extern.h>
22
23static void at_pcbdisconnect( struct ddpcb *ddp );
24static void at_sockaddr(struct ddpcb *ddp, struct sockaddr **addr);
25static int at_pcbsetaddr(struct ddpcb *ddp, struct sockaddr *addr,
26			  struct proc *p);
27static int at_pcbconnect(struct ddpcb *ddp, struct sockaddr *addr,
28			 struct proc *p);
29static void at_pcbdetach(struct socket *so, struct ddpcb *ddp);
30static int at_pcballoc(struct socket *so);
31
32struct ddpcb	*ddp_ports[ ATPORT_LAST ];
33struct ddpcb	*ddpcb = NULL;
34static u_long	ddp_sendspace = DDP_MAXSZ; /* Max ddp size + 1 (ddp_type) */
35static u_long	ddp_recvspace = 10 * ( 587 + sizeof( struct sockaddr_at ));
36
37
38static int
39ddp_attach(struct socket *so, int proto, struct proc *p)
40{
41	struct ddpcb	*ddp;
42	int		error = 0;
43	int		s;
44
45
46	ddp = sotoddpcb( so );
47	if ( ddp != NULL ) {
48	    return( EINVAL);
49	}
50
51	s = splnet();
52	error = at_pcballoc( so );
53	splx(s);
54	if (error) {
55	    return (error);
56	}
57	return (soreserve( so, ddp_sendspace, ddp_recvspace ));
58}
59
60static int
61ddp_detach(struct socket *so)
62{
63	struct ddpcb	*ddp;
64	int		s;
65
66	ddp = sotoddpcb( so );
67	if ( ddp == NULL ) {
68	    return( EINVAL);
69	}
70	s = splnet();
71	at_pcbdetach( so, ddp );
72	splx(s);
73	return(0);
74}
75
76static int
77ddp_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
78{
79	struct ddpcb	*ddp;
80	int		error = 0;
81	int		s;
82
83	ddp = sotoddpcb( so );
84	if ( ddp == NULL ) {
85	    return( EINVAL);
86	}
87	s = splnet();
88	error = at_pcbsetaddr(ddp, nam, p);
89	splx(s);
90	return (error);
91}
92
93static int
94ddp_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
95{
96	struct ddpcb	*ddp;
97	int		error = 0;
98	int		s;
99
100	ddp = sotoddpcb( so );
101	if ( ddp == NULL ) {
102	    return( EINVAL);
103	}
104
105	if ( ddp->ddp_fsat.sat_port != ATADDR_ANYPORT ) {
106	    return(EISCONN);
107	}
108
109	s = splnet();
110	error = at_pcbconnect( ddp, nam, p );
111	splx(s);
112	if ( error == 0 )
113	    soisconnected( so );
114	return(error);
115}
116
117static int
118ddp_disconnect(struct socket *so)
119{
120
121	struct ddpcb	*ddp;
122	int		s;
123
124	ddp = sotoddpcb( so );
125	if ( ddp == NULL ) {
126	    return( EINVAL);
127	}
128	if ( ddp->ddp_fsat.sat_addr.s_node == ATADDR_ANYNODE ) {
129	    return(ENOTCONN);
130	}
131
132	s = splnet();
133	at_pcbdisconnect( ddp );
134	ddp->ddp_fsat.sat_addr.s_node = ATADDR_ANYNODE;
135	splx(s);
136	soisdisconnected( so );
137	return(0);
138}
139
140static int
141ddp_shutdown(struct socket *so)
142{
143	struct ddpcb	*ddp;
144
145	ddp = sotoddpcb( so );
146	if ( ddp == NULL ) {
147		return( EINVAL);
148	}
149	socantsendmore( so );
150	return(0);
151}
152
153static int
154ddp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
155            struct mbuf *control, struct proc *p)
156{
157	struct ddpcb	*ddp;
158	int		error = 0;
159	int		s;
160
161	ddp = sotoddpcb( so );
162	if ( ddp == NULL ) {
163		return(EINVAL);
164	}
165
166    	if ( control && control->m_len ) {
167		return(EINVAL);
168    	}
169
170	if ( addr ) {
171		if ( ddp->ddp_fsat.sat_port != ATADDR_ANYPORT ) {
172			return(EISCONN);
173		}
174
175		s = splnet();
176		error = at_pcbconnect(ddp, addr, p);
177		splx( s );
178		if ( error ) {
179			return(error);
180		}
181	} else {
182		if ( ddp->ddp_fsat.sat_port == ATADDR_ANYPORT ) {
183			return(ENOTCONN);
184		}
185	}
186
187	s = splnet();
188	error = ddp_output( m, so );
189	if ( addr ) {
190	    at_pcbdisconnect( ddp );
191	}
192	splx(s);
193	return(error);
194}
195
196static int
197ddp_abort(struct socket *so)
198{
199	struct ddpcb	*ddp;
200	int		s;
201
202	ddp = sotoddpcb( so );
203	if ( ddp == NULL ) {
204		return(EINVAL);
205	}
206	soisdisconnected( so );
207	s = splnet();
208	at_pcbdetach( so, ddp );
209	splx(s);
210	return(0);
211}
212
213
214static void
215at_sockaddr(struct ddpcb *ddp, struct sockaddr **addr)
216{
217    *addr = dup_sockaddr((struct sockaddr *)&ddp->ddp_lsat, 0);
218}
219
220static int
221at_pcbsetaddr(struct ddpcb *ddp, struct sockaddr *addr, struct proc *p)
222{
223    struct sockaddr_at	lsat, *sat;
224    struct at_ifaddr	*aa;
225    struct ddpcb	*ddpp;
226
227    if ( ddp->ddp_lsat.sat_port != ATADDR_ANYPORT ) { /* shouldn't be bound */
228	return( EINVAL );
229    }
230
231    if (addr != 0) {			/* validate passed address */
232	sat = (struct sockaddr_at *)addr;
233	if (sat->sat_family != AF_APPLETALK) {
234	    return(EAFNOSUPPORT);
235	}
236
237	if ( sat->sat_addr.s_node != ATADDR_ANYNODE ||
238		sat->sat_addr.s_net != ATADDR_ANYNET ) {
239	    for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
240		if (( sat->sat_addr.s_net == AA_SAT( aa )->sat_addr.s_net ) &&
241		 ( sat->sat_addr.s_node == AA_SAT( aa )->sat_addr.s_node )) {
242		    break;
243		}
244	    }
245	    if ( !aa ) {
246		return( EADDRNOTAVAIL );
247	    }
248	}
249
250	if ( sat->sat_port != ATADDR_ANYPORT ) {
251	    if ( sat->sat_port < ATPORT_FIRST ||
252		    sat->sat_port >= ATPORT_LAST ) {
253		return( EINVAL );
254	    }
255	    if ( sat->sat_port < ATPORT_RESERVED &&
256		 suser(p) ) {
257		return( EACCES );
258	    }
259	}
260    } else {
261	bzero( (caddr_t)&lsat, sizeof( struct sockaddr_at ));
262	lsat.sat_len = sizeof(struct sockaddr_at);
263	lsat.sat_addr.s_node = ATADDR_ANYNODE;
264	lsat.sat_addr.s_net = ATADDR_ANYNET;
265	lsat.sat_family = AF_APPLETALK;
266	sat = &lsat;
267    }
268
269    if ( sat->sat_addr.s_node == ATADDR_ANYNODE &&
270	    sat->sat_addr.s_net == ATADDR_ANYNET ) {
271	if ( at_ifaddr == NULL ) {
272	    return( EADDRNOTAVAIL );
273	}
274	sat->sat_addr = AA_SAT( at_ifaddr )->sat_addr;
275    }
276    ddp->ddp_lsat = *sat;
277
278    /*
279     * Choose port.
280     */
281    if ( sat->sat_port == ATADDR_ANYPORT ) {
282	for ( sat->sat_port = ATPORT_RESERVED;
283		sat->sat_port < ATPORT_LAST; sat->sat_port++ ) {
284	    if ( ddp_ports[ sat->sat_port - 1 ] == 0 ) {
285		break;
286	    }
287	}
288	if ( sat->sat_port == ATPORT_LAST ) {
289	    return( EADDRNOTAVAIL );
290	}
291	ddp->ddp_lsat.sat_port = sat->sat_port;
292	ddp_ports[ sat->sat_port - 1 ] = ddp;
293    } else {
294	for ( ddpp = ddp_ports[ sat->sat_port - 1 ]; ddpp;
295		ddpp = ddpp->ddp_pnext ) {
296	    if ( ddpp->ddp_lsat.sat_addr.s_net == sat->sat_addr.s_net &&
297		    ddpp->ddp_lsat.sat_addr.s_node == sat->sat_addr.s_node ) {
298		break;
299	    }
300	}
301	if ( ddpp != NULL ) {
302	    return( EADDRINUSE );
303	}
304	ddp->ddp_pnext = ddp_ports[ sat->sat_port - 1 ];
305	ddp_ports[ sat->sat_port - 1 ] = ddp;
306	if ( ddp->ddp_pnext ) {
307	    ddp->ddp_pnext->ddp_pprev = ddp;
308	}
309    }
310
311    return( 0 );
312}
313
314static int
315at_pcbconnect(struct ddpcb *ddp, struct sockaddr *addr, struct proc *p)
316{
317    struct sockaddr_at	*sat = (struct sockaddr_at *)addr;
318    struct route	*ro;
319    struct at_ifaddr	*aa = 0;
320    struct ifnet	*ifp;
321    u_short		hintnet = 0, net;
322
323    if (sat->sat_family != AF_APPLETALK) {
324	return(EAFNOSUPPORT);
325    }
326
327    /*
328     * Under phase 2, network 0 means "the network".  We take "the
329     * network" to mean the network the control block is bound to.
330     * If the control block is not bound, there is an error.
331     */
332    if ( sat->sat_addr.s_net == ATADDR_ANYNET
333		&& sat->sat_addr.s_node != ATADDR_ANYNODE ) {
334	if ( ddp->ddp_lsat.sat_port == ATADDR_ANYPORT ) {
335	    return( EADDRNOTAVAIL );
336	}
337	hintnet = ddp->ddp_lsat.sat_addr.s_net;
338    }
339
340    ro = &ddp->ddp_route;
341    /*
342     * If we've got an old route for this pcb, check that it is valid.
343     * If we've changed our address, we may have an old "good looking"
344     * route here.  Attempt to detect it.
345     */
346    if ( ro->ro_rt ) {
347	if ( hintnet ) {
348	    net = hintnet;
349	} else {
350	    net = sat->sat_addr.s_net;
351	}
352	aa = 0;
353	if ((ifp = ro->ro_rt->rt_ifp) != NULL) {
354	    for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
355		if ( aa->aa_ifp == ifp &&
356			ntohs( net ) >= ntohs( aa->aa_firstnet ) &&
357			ntohs( net ) <= ntohs( aa->aa_lastnet )) {
358		    break;
359		}
360	    }
361	}
362	if ( aa == NULL || ( satosat( &ro->ro_dst )->sat_addr.s_net !=
363		( hintnet ? hintnet : sat->sat_addr.s_net ) ||
364		satosat( &ro->ro_dst )->sat_addr.s_node !=
365		sat->sat_addr.s_node )) {
366	    RTFREE( ro->ro_rt );
367	    ro->ro_rt = (struct rtentry *)0;
368	}
369    }
370
371    /*
372     * If we've got no route for this interface, try to find one.
373     */
374    if ( ro->ro_rt == (struct rtentry *)0 ||
375	 ro->ro_rt->rt_ifp == (struct ifnet *)0 ) {
376	ro->ro_dst.sa_len = sizeof( struct sockaddr_at );
377	ro->ro_dst.sa_family = AF_APPLETALK;
378	if ( hintnet ) {
379	    satosat( &ro->ro_dst )->sat_addr.s_net = hintnet;
380	} else {
381	    satosat( &ro->ro_dst )->sat_addr.s_net = sat->sat_addr.s_net;
382	}
383	satosat( &ro->ro_dst )->sat_addr.s_node = sat->sat_addr.s_node;
384	rtalloc( ro );
385    }
386
387    /*
388     * Make sure any route that we have has a valid interface.
389     */
390    aa = 0;
391    if ( ro->ro_rt && ( ifp = ro->ro_rt->rt_ifp )) {
392	for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
393	    if ( aa->aa_ifp == ifp ) {
394		break;
395	    }
396	}
397    }
398    if ( aa == 0 ) {
399	return( ENETUNREACH );
400    }
401
402    ddp->ddp_fsat = *sat;
403    if ( ddp->ddp_lsat.sat_port == ATADDR_ANYPORT ) {
404	return(at_pcbsetaddr(ddp, (struct sockaddr *)0, p));
405    }
406    return( 0 );
407}
408
409static void
410at_pcbdisconnect( struct ddpcb	*ddp )
411{
412    ddp->ddp_fsat.sat_addr.s_net = ATADDR_ANYNET;
413    ddp->ddp_fsat.sat_addr.s_node = ATADDR_ANYNODE;
414    ddp->ddp_fsat.sat_port = ATADDR_ANYPORT;
415}
416
417static int
418at_pcballoc( struct socket *so )
419{
420	struct ddpcb	*ddp;
421
422	MALLOC(ddp, struct ddpcb *, sizeof *ddp, M_PCB, M_WAITOK | M_ZERO);
423	ddp->ddp_lsat.sat_port = ATADDR_ANYPORT;
424
425	ddp->ddp_next = ddpcb;
426	ddp->ddp_prev = NULL;
427	ddp->ddp_pprev = NULL;
428	ddp->ddp_pnext = NULL;
429	if (ddpcb) {
430		ddpcb->ddp_prev = ddp;
431	}
432	ddpcb = ddp;
433
434	ddp->ddp_socket = so;
435	so->so_pcb = (caddr_t)ddp;
436	return(0);
437}
438
439static void
440at_pcbdetach( struct socket *so, struct ddpcb *ddp)
441{
442    soisdisconnected( so );
443    so->so_pcb = 0;
444    sofree( so );
445
446    /* remove ddp from ddp_ports list */
447    if ( ddp->ddp_lsat.sat_port != ATADDR_ANYPORT &&
448	    ddp_ports[ ddp->ddp_lsat.sat_port - 1 ] != NULL ) {
449	if ( ddp->ddp_pprev != NULL ) {
450	    ddp->ddp_pprev->ddp_pnext = ddp->ddp_pnext;
451	} else {
452	    ddp_ports[ ddp->ddp_lsat.sat_port - 1 ] = ddp->ddp_pnext;
453	}
454	if ( ddp->ddp_pnext != NULL ) {
455	    ddp->ddp_pnext->ddp_pprev = ddp->ddp_pprev;
456	}
457    }
458
459    if ( ddp->ddp_route.ro_rt ) {
460	rtfree( ddp->ddp_route.ro_rt );
461    }
462
463    if ( ddp->ddp_prev ) {
464	ddp->ddp_prev->ddp_next = ddp->ddp_next;
465    } else {
466	ddpcb = ddp->ddp_next;
467    }
468    if ( ddp->ddp_next ) {
469	ddp->ddp_next->ddp_prev = ddp->ddp_prev;
470    }
471    FREE(ddp, M_PCB);
472}
473
474/*
475 * For the moment, this just find the pcb with the correct local address.
476 * In the future, this will actually do some real searching, so we can use
477 * the sender's address to do de-multiplexing on a single port to many
478 * sockets (pcbs).
479 */
480struct ddpcb *
481ddp_search( struct sockaddr_at *from, struct sockaddr_at *to,
482			struct at_ifaddr *aa)
483{
484    struct ddpcb	*ddp;
485
486    /*
487     * Check for bad ports.
488     */
489    if ( to->sat_port < ATPORT_FIRST || to->sat_port >= ATPORT_LAST ) {
490	return( NULL );
491    }
492
493    /*
494     * Make sure the local address matches the sent address.  What about
495     * the interface?
496     */
497    for ( ddp = ddp_ports[ to->sat_port - 1 ]; ddp; ddp = ddp->ddp_pnext ) {
498	/* XXX should we handle 0.YY? */
499
500	/* XXXX.YY to socket on destination interface */
501	if ( to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net &&
502		to->sat_addr.s_node == ddp->ddp_lsat.sat_addr.s_node ) {
503	    break;
504	}
505
506	/* 0.255 to socket on receiving interface */
507	if ( to->sat_addr.s_node == ATADDR_BCAST && ( to->sat_addr.s_net == 0 ||
508		to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net ) &&
509		ddp->ddp_lsat.sat_addr.s_net == AA_SAT( aa )->sat_addr.s_net ) {
510	    break;
511	}
512
513	/* XXXX.0 to socket on destination interface */
514	if ( to->sat_addr.s_net == aa->aa_firstnet &&
515		to->sat_addr.s_node == 0 &&
516		ntohs( ddp->ddp_lsat.sat_addr.s_net ) >=
517		ntohs( aa->aa_firstnet ) &&
518		ntohs( ddp->ddp_lsat.sat_addr.s_net ) <=
519		ntohs( aa->aa_lastnet )) {
520	    break;
521	}
522    }
523    return( ddp );
524}
525static int
526at_setpeeraddr(struct socket *so, struct sockaddr **nam)
527{
528	return(EOPNOTSUPP);
529}
530
531static int
532at_setsockaddr(struct socket *so, struct sockaddr **nam)
533{
534	struct ddpcb	*ddp;
535
536	ddp = sotoddpcb( so );
537	if ( ddp == NULL ) {
538	    return( EINVAL);
539	}
540	at_sockaddr( ddp, nam );
541	return(0);
542}
543
544
545void
546ddp_init(void )
547{
548    atintrq1.ifq_maxlen = IFQ_MAXLEN;
549    atintrq2.ifq_maxlen = IFQ_MAXLEN;
550    mtx_init(&atintrq1.ifq_mtx, "at1_inq", MTX_DEF);
551    mtx_init(&atintrq2.ifq_mtx, "at2_inq", MTX_DEF);
552}
553
554#if 0
555static void
556ddp_clean(void )
557{
558    struct ddpcb	*ddp;
559
560    for ( ddp = ddpcb; ddp; ddp = ddp->ddp_next ) {
561	at_pcbdetach( ddp->ddp_socket, ddp );
562    }
563}
564#endif
565
566struct pr_usrreqs ddp_usrreqs = {
567	ddp_abort,
568	pru_accept_notsupp,
569	ddp_attach,
570	ddp_bind,
571	ddp_connect,
572	pru_connect2_notsupp,
573	at_control,
574	ddp_detach,
575	ddp_disconnect,
576	pru_listen_notsupp,
577	at_setpeeraddr,
578	pru_rcvd_notsupp,
579	pru_rcvoob_notsupp,
580	ddp_send,
581	pru_sense_null,
582	ddp_shutdown,
583	at_setsockaddr,
584	sosend,
585	soreceive,
586	sopoll
587};
588