xref: /netbsd-src/sys/netatalk/ddp_usrreq.c (revision 23c8222edbfb0f0932d88a8351d3a0cf817dfb9e) 
1 /*	$NetBSD: ddp_usrreq.c,v 1.12 2004/04/18 18:55:57 matt Exp $	 */
2 
3 /*
4  * Copyright (c) 1990,1991 Regents of The University of Michigan.
5  * All Rights Reserved.
6  *
7  * Permission to use, copy, modify, and distribute this software and
8  * its documentation for any purpose and without fee is hereby granted,
9  * provided that the above copyright notice appears in all copies and
10  * that both that copyright notice and this permission notice appear
11  * in supporting documentation, and that the name of The University
12  * of Michigan not be used in advertising or publicity pertaining to
13  * distribution of the software without specific, written prior
14  * permission. This software is supplied as is without expressed or
15  * implied warranties of any kind.
16  *
17  * This product includes software developed by the University of
18  * California, Berkeley and its contributors.
19  *
20  *	Research Systems Unix Group
21  *	The University of Michigan
22  *	c/o Wesley Craig
23  *	535 W. William Street
24  *	Ann Arbor, Michigan
25  *	+1-313-764-2278
26  *	netatalk@umich.edu
27  */
28 
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: ddp_usrreq.c,v 1.12 2004/04/18 18:55:57 matt Exp $");
31 
32 #include "opt_mbuftrace.h"
33 
34 #include <sys/param.h>
35 #include <sys/errno.h>
36 #include <sys/systm.h>
37 #include <sys/proc.h>
38 #include <sys/mbuf.h>
39 #include <sys/ioctl.h>
40 #include <sys/socket.h>
41 #include <sys/socketvar.h>
42 #include <sys/protosw.h>
43 #include <net/if.h>
44 #include <net/route.h>
45 #include <net/if_ether.h>
46 #include <netinet/in.h>
47 
48 #include <netatalk/at.h>
49 #include <netatalk/at_var.h>
50 #include <netatalk/ddp_var.h>
51 #include <netatalk/aarp.h>
52 #include <netatalk/at_extern.h>
53 
54 static void at_pcbdisconnect __P((struct ddpcb *));
55 static void at_sockaddr __P((struct ddpcb *, struct mbuf *));
56 static int at_pcbsetaddr __P((struct ddpcb *, struct mbuf *, struct proc *));
57 static int at_pcbconnect __P((struct ddpcb *, struct mbuf *, struct proc *));
58 static void at_pcbdetach __P((struct socket *, struct ddpcb *));
59 static int at_pcballoc __P((struct socket *));
60 
61 struct ifqueue atintrq1, atintrq2;
62 struct ddpcb   *ddp_ports[ATPORT_LAST];
63 struct ddpcb   *ddpcb = NULL;
64 struct ddpstat	ddpstat;
65 struct at_ifaddrhead at_ifaddr;		/* Here as inited in this file */
66 u_long ddp_sendspace = DDP_MAXSZ;	/* Max ddp size + 1 (ddp_type) */
67 u_long ddp_recvspace = 25 * (587 + sizeof(struct sockaddr_at));
68 
69 #ifdef MBUFTRACE
70 struct mowner atalk_rx_mowner = { "atalk", "rx" };
71 struct mowner atalk_tx_mowner = { "atalk", "tx" };
72 #endif
73 
74 /* ARGSUSED */
75 int
76 ddp_usrreq(so, req, m, addr, rights, p)
77 	struct socket  *so;
78 	int             req;
79 	struct mbuf    *m;
80 	struct mbuf    *addr;
81 	struct mbuf    *rights;
82 	struct proc    *p;
83 {
84 	struct ddpcb   *ddp;
85 	int             error = 0;
86 
87 	ddp = sotoddpcb(so);
88 
89 	if (req == PRU_CONTROL) {
90 		return (at_control((long) m, (caddr_t) addr,
91 		    (struct ifnet *) rights, (struct proc *) p));
92 	}
93 	if (req == PRU_PURGEIF) {
94 		at_purgeif((struct ifnet *) rights);
95 		return (0);
96 	}
97 	if (rights && rights->m_len) {
98 		error = EINVAL;
99 		goto release;
100 	}
101 	if (ddp == NULL && req != PRU_ATTACH) {
102 		error = EINVAL;
103 		goto release;
104 	}
105 	switch (req) {
106 	case PRU_ATTACH:
107 		if (ddp != NULL) {
108 			error = EINVAL;
109 			break;
110 		}
111 		if ((error = at_pcballoc(so)) != 0) {
112 			break;
113 		}
114 		error = soreserve(so, ddp_sendspace, ddp_recvspace);
115 		break;
116 
117 	case PRU_DETACH:
118 		at_pcbdetach(so, ddp);
119 		break;
120 
121 	case PRU_BIND:
122 		error = at_pcbsetaddr(ddp, addr, p);
123 		break;
124 
125 	case PRU_SOCKADDR:
126 		at_sockaddr(ddp, addr);
127 		break;
128 
129 	case PRU_CONNECT:
130 		if (ddp->ddp_fsat.sat_port != ATADDR_ANYPORT) {
131 			error = EISCONN;
132 			break;
133 		}
134 		error = at_pcbconnect(ddp, addr, p);
135 		if (error == 0)
136 			soisconnected(so);
137 		break;
138 
139 	case PRU_DISCONNECT:
140 		if (ddp->ddp_fsat.sat_addr.s_node == ATADDR_ANYNODE) {
141 			error = ENOTCONN;
142 			break;
143 		}
144 		at_pcbdisconnect(ddp);
145 		soisdisconnected(so);
146 		break;
147 
148 	case PRU_SHUTDOWN:
149 		socantsendmore(so);
150 		break;
151 
152 	case PRU_SEND:{
153 			int s = 0;
154 
155 			if (addr) {
156 				if (ddp->ddp_fsat.sat_port != ATADDR_ANYPORT) {
157 					error = EISCONN;
158 					break;
159 				}
160 				s = splnet();
161 				error = at_pcbconnect(ddp, addr, p);
162 				if (error) {
163 					splx(s);
164 					break;
165 				}
166 			} else {
167 				if (ddp->ddp_fsat.sat_port == ATADDR_ANYPORT) {
168 					error = ENOTCONN;
169 					break;
170 				}
171 			}
172 
173 			error = ddp_output(m, ddp);
174 			m = NULL;
175 			if (addr) {
176 				at_pcbdisconnect(ddp);
177 				splx(s);
178 			}
179 		}
180 		break;
181 
182 	case PRU_ABORT:
183 		soisdisconnected(so);
184 		at_pcbdetach(so, ddp);
185 		break;
186 
187 	case PRU_LISTEN:
188 	case PRU_CONNECT2:
189 	case PRU_ACCEPT:
190 	case PRU_SENDOOB:
191 	case PRU_FASTTIMO:
192 	case PRU_SLOWTIMO:
193 	case PRU_PROTORCV:
194 	case PRU_PROTOSEND:
195 		error = EOPNOTSUPP;
196 		break;
197 
198 	case PRU_RCVD:
199 	case PRU_RCVOOB:
200 		/*
201 		 * Don't mfree. Good architecture...
202 		 */
203 		return (EOPNOTSUPP);
204 
205 	case PRU_SENSE:
206 		/*
207 		 * 1. Don't return block size.
208 		 * 2. Don't mfree.
209 		 */
210 		return (0);
211 
212 	default:
213 		error = EOPNOTSUPP;
214 	}
215 
216 release:
217 	if (m != NULL) {
218 		m_freem(m);
219 	}
220 	return (error);
221 }
222 
223 static void
224 at_sockaddr(ddp, addr)
225 	struct ddpcb   *ddp;
226 	struct mbuf    *addr;
227 {
228 	struct sockaddr_at *sat;
229 
230 	addr->m_len = sizeof(struct sockaddr_at);
231 	sat = mtod(addr, struct sockaddr_at *);
232 	*sat = ddp->ddp_lsat;
233 }
234 
235 static int
236 at_pcbsetaddr(ddp, addr, p)
237 	struct ddpcb   *ddp;
238 	struct mbuf    *addr;
239 	struct proc    *p;
240 {
241 	struct sockaddr_at lsat, *sat;
242 	struct at_ifaddr *aa;
243 	struct ddpcb   *ddpp;
244 
245 	if (ddp->ddp_lsat.sat_port != ATADDR_ANYPORT) {	/* shouldn't be bound */
246 		return (EINVAL);
247 	}
248 	if (addr != 0) {	/* validate passed address */
249 		sat = mtod(addr, struct sockaddr_at *);
250 		if (addr->m_len != sizeof(*sat))
251 			return (EINVAL);
252 
253 		if (sat->sat_family != AF_APPLETALK)
254 			return (EAFNOSUPPORT);
255 
256 		if (sat->sat_addr.s_node != ATADDR_ANYNODE ||
257 		    sat->sat_addr.s_net != ATADDR_ANYNET) {
258 			for (aa = at_ifaddr.tqh_first; aa;
259 			    aa = aa->aa_list.tqe_next) {
260 				if ((sat->sat_addr.s_net ==
261 				    AA_SAT(aa)->sat_addr.s_net) &&
262 				    (sat->sat_addr.s_node ==
263 				    AA_SAT(aa)->sat_addr.s_node))
264 					break;
265 			}
266 			if (!aa)
267 				return (EADDRNOTAVAIL);
268 		}
269 		if (sat->sat_port != ATADDR_ANYPORT) {
270 			if (sat->sat_port < ATPORT_FIRST ||
271 			    sat->sat_port >= ATPORT_LAST)
272 				return (EINVAL);
273 
274 			if (sat->sat_port < ATPORT_RESERVED &&
275 			    suser(p->p_ucred, &p->p_acflag))
276 				return (EACCES);
277 		}
278 	} else {
279 		bzero((caddr_t) & lsat, sizeof(struct sockaddr_at));
280 		lsat.sat_len = sizeof(struct sockaddr_at);
281 		lsat.sat_addr.s_node = ATADDR_ANYNODE;
282 		lsat.sat_addr.s_net = ATADDR_ANYNET;
283 		lsat.sat_family = AF_APPLETALK;
284 		sat = &lsat;
285 	}
286 
287 	if (sat->sat_addr.s_node == ATADDR_ANYNODE &&
288 	    sat->sat_addr.s_net == ATADDR_ANYNET) {
289 		if (at_ifaddr.tqh_first == NULL)
290 			return (EADDRNOTAVAIL);
291 		sat->sat_addr = AA_SAT(at_ifaddr.tqh_first)->sat_addr;
292 	}
293 	ddp->ddp_lsat = *sat;
294 
295 	/*
296          * Choose port.
297          */
298 	if (sat->sat_port == ATADDR_ANYPORT) {
299 		for (sat->sat_port = ATPORT_RESERVED;
300 		     sat->sat_port < ATPORT_LAST; sat->sat_port++) {
301 			if (ddp_ports[sat->sat_port - 1] == 0)
302 				break;
303 		}
304 		if (sat->sat_port == ATPORT_LAST) {
305 			return (EADDRNOTAVAIL);
306 		}
307 		ddp->ddp_lsat.sat_port = sat->sat_port;
308 		ddp_ports[sat->sat_port - 1] = ddp;
309 	} else {
310 		for (ddpp = ddp_ports[sat->sat_port - 1]; ddpp;
311 		     ddpp = ddpp->ddp_pnext) {
312 			if (ddpp->ddp_lsat.sat_addr.s_net ==
313 			    sat->sat_addr.s_net &&
314 			    ddpp->ddp_lsat.sat_addr.s_node ==
315 			    sat->sat_addr.s_node)
316 				break;
317 		}
318 		if (ddpp != NULL)
319 			return (EADDRINUSE);
320 
321 		ddp->ddp_pnext = ddp_ports[sat->sat_port - 1];
322 		ddp_ports[sat->sat_port - 1] = ddp;
323 		if (ddp->ddp_pnext)
324 			ddp->ddp_pnext->ddp_pprev = ddp;
325 	}
326 
327 	return 0;
328 }
329 
330 static int
331 at_pcbconnect(ddp, addr, p)
332 	struct ddpcb   *ddp;
333 	struct mbuf    *addr;
334 	struct proc    *p;
335 {
336 	struct sockaddr_at *sat = mtod(addr, struct sockaddr_at *);
337 	struct route   *ro;
338 	struct at_ifaddr *aa = 0;
339 	struct ifnet   *ifp;
340 	u_short         hintnet = 0, net;
341 
342 	if (addr->m_len != sizeof(*sat))
343 		return (EINVAL);
344 	if (sat->sat_family != AF_APPLETALK) {
345 		return (EAFNOSUPPORT);
346 	}
347 	/*
348          * Under phase 2, network 0 means "the network".  We take "the
349          * network" to mean the network the control block is bound to.
350          * If the control block is not bound, there is an error.
351          */
352 	if (sat->sat_addr.s_net == ATADDR_ANYNET
353 	    && sat->sat_addr.s_node != ATADDR_ANYNODE) {
354 		if (ddp->ddp_lsat.sat_port == ATADDR_ANYPORT) {
355 			return (EADDRNOTAVAIL);
356 		}
357 		hintnet = ddp->ddp_lsat.sat_addr.s_net;
358 	}
359 	ro = &ddp->ddp_route;
360 	/*
361          * If we've got an old route for this pcb, check that it is valid.
362          * If we've changed our address, we may have an old "good looking"
363          * route here.  Attempt to detect it.
364          */
365 	if (ro->ro_rt) {
366 		if (hintnet) {
367 			net = hintnet;
368 		} else {
369 			net = sat->sat_addr.s_net;
370 		}
371 		aa = 0;
372 		if ((ifp = ro->ro_rt->rt_ifp) != NULL) {
373 			for (aa = at_ifaddr.tqh_first; aa;
374 			    aa = aa->aa_list.tqe_next) {
375 				if (aa->aa_ifp == ifp &&
376 				    ntohs(net) >= ntohs(aa->aa_firstnet) &&
377 				    ntohs(net) <= ntohs(aa->aa_lastnet)) {
378 					break;
379 				}
380 			}
381 		}
382 		if (aa == NULL || (satosat(&ro->ro_dst)->sat_addr.s_net !=
383 		    (hintnet ? hintnet : sat->sat_addr.s_net) ||
384 		    satosat(&ro->ro_dst)->sat_addr.s_node !=
385 		    sat->sat_addr.s_node)) {
386 			RTFREE(ro->ro_rt);
387 			ro->ro_rt = (struct rtentry *) 0;
388 		}
389 	}
390 	/*
391          * If we've got no route for this interface, try to find one.
392          */
393 	if (ro->ro_rt == (struct rtentry *) 0 ||
394 	    ro->ro_rt->rt_ifp == (struct ifnet *) 0) {
395 		bzero(&ro->ro_dst, sizeof(struct sockaddr_at));
396 		ro->ro_dst.sa_len = sizeof(struct sockaddr_at);
397 		ro->ro_dst.sa_family = AF_APPLETALK;
398 		if (hintnet) {
399 			satosat(&ro->ro_dst)->sat_addr.s_net = hintnet;
400 		} else {
401 			satosat(&ro->ro_dst)->sat_addr.s_net =
402 			    sat->sat_addr.s_net;
403 		}
404 		satosat(&ro->ro_dst)->sat_addr.s_node = sat->sat_addr.s_node;
405 		rtalloc(ro);
406 	}
407 	/*
408          * Make sure any route that we have has a valid interface.
409          */
410 	aa = 0;
411 	if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp)) {
412 		for (aa = at_ifaddr.tqh_first; aa; aa = aa->aa_list.tqe_next) {
413 			if (aa->aa_ifp == ifp) {
414 				break;
415 			}
416 		}
417 	}
418 	if (aa == 0) {
419 		return (ENETUNREACH);
420 	}
421 	ddp->ddp_fsat = *sat;
422 	if (ddp->ddp_lsat.sat_port == ATADDR_ANYPORT) {
423 		return (at_pcbsetaddr(ddp, (struct mbuf *) 0, p));
424 	}
425 	return (0);
426 }
427 
428 static void
429 at_pcbdisconnect(ddp)
430 	struct ddpcb   *ddp;
431 {
432 	ddp->ddp_fsat.sat_addr.s_net = ATADDR_ANYNET;
433 	ddp->ddp_fsat.sat_addr.s_node = ATADDR_ANYNODE;
434 	ddp->ddp_fsat.sat_port = ATADDR_ANYPORT;
435 }
436 
437 static int
438 at_pcballoc(so)
439 	struct socket  *so;
440 {
441 	struct ddpcb   *ddp;
442 
443 	MALLOC(ddp, struct ddpcb *, sizeof(*ddp), M_PCB, M_WAITOK|M_ZERO);
444 	if (!ddp)
445 		panic("at_pcballoc");
446 	ddp->ddp_lsat.sat_port = ATADDR_ANYPORT;
447 
448 	ddp->ddp_next = ddpcb;
449 	ddp->ddp_prev = NULL;
450 	ddp->ddp_pprev = NULL;
451 	ddp->ddp_pnext = NULL;
452 	if (ddpcb) {
453 		ddpcb->ddp_prev = ddp;
454 	}
455 	ddpcb = ddp;
456 
457 	ddp->ddp_socket = so;
458 	so->so_pcb = (caddr_t) ddp;
459 #ifdef MBUFTRACE
460 	so->so_rcv.sb_mowner = &atalk_rx_mowner;
461 	so->so_snd.sb_mowner = &atalk_tx_mowner;
462 #endif
463 	return (0);
464 }
465 
466 static void
467 at_pcbdetach(so, ddp)
468 	struct socket  *so;
469 	struct ddpcb   *ddp;
470 {
471 	soisdisconnected(so);
472 	so->so_pcb = 0;
473 	sofree(so);
474 
475 	/* remove ddp from ddp_ports list */
476 	if (ddp->ddp_lsat.sat_port != ATADDR_ANYPORT &&
477 	    ddp_ports[ddp->ddp_lsat.sat_port - 1] != NULL) {
478 		if (ddp->ddp_pprev != NULL) {
479 			ddp->ddp_pprev->ddp_pnext = ddp->ddp_pnext;
480 		} else {
481 			ddp_ports[ddp->ddp_lsat.sat_port - 1] = ddp->ddp_pnext;
482 		}
483 		if (ddp->ddp_pnext != NULL) {
484 			ddp->ddp_pnext->ddp_pprev = ddp->ddp_pprev;
485 		}
486 	}
487 	if (ddp->ddp_route.ro_rt) {
488 		rtfree(ddp->ddp_route.ro_rt);
489 	}
490 	if (ddp->ddp_prev) {
491 		ddp->ddp_prev->ddp_next = ddp->ddp_next;
492 	} else {
493 		ddpcb = ddp->ddp_next;
494 	}
495 	if (ddp->ddp_next) {
496 		ddp->ddp_next->ddp_prev = ddp->ddp_prev;
497 	}
498 	free(ddp, M_PCB);
499 }
500 
501 /*
502  * For the moment, this just find the pcb with the correct local address.
503  * In the future, this will actually do some real searching, so we can use
504  * the sender's address to do de-multiplexing on a single port to many
505  * sockets (pcbs).
506  */
507 struct ddpcb   *
508 ddp_search(from, to, aa)
509 	struct sockaddr_at *from;
510 	struct sockaddr_at *to;
511 	struct at_ifaddr *aa;
512 {
513 	struct ddpcb   *ddp;
514 
515 	/*
516          * Check for bad ports.
517          */
518 	if (to->sat_port < ATPORT_FIRST || to->sat_port >= ATPORT_LAST) {
519 		return (NULL);
520 	}
521 	/*
522          * Make sure the local address matches the sent address.  What about
523          * the interface?
524          */
525 	for (ddp = ddp_ports[to->sat_port - 1]; ddp; ddp = ddp->ddp_pnext) {
526 		/* XXX should we handle 0.YY? */
527 
528 		/* XXXX.YY to socket on destination interface */
529 		if (to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net &&
530 		    to->sat_addr.s_node == ddp->ddp_lsat.sat_addr.s_node) {
531 			break;
532 		}
533 		/* 0.255 to socket on receiving interface */
534 		if (to->sat_addr.s_node == ATADDR_BCAST &&
535 		    (to->sat_addr.s_net == 0 ||
536 		    to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net) &&
537 		ddp->ddp_lsat.sat_addr.s_net == AA_SAT(aa)->sat_addr.s_net) {
538 			break;
539 		}
540 		/* XXXX.0 to socket on destination interface */
541 		if (to->sat_addr.s_net == aa->aa_firstnet &&
542 		    to->sat_addr.s_node == 0 &&
543 		    ntohs(ddp->ddp_lsat.sat_addr.s_net) >=
544 		    ntohs(aa->aa_firstnet) &&
545 		    ntohs(ddp->ddp_lsat.sat_addr.s_net) <=
546 		    ntohs(aa->aa_lastnet)) {
547 			break;
548 		}
549 	}
550 	return (ddp);
551 }
552 
553 /*
554  * Initialize all the ddp & appletalk stuff
555  */
556 void
557 ddp_init()
558 {
559 	TAILQ_INIT(&at_ifaddr);
560 	atintrq1.ifq_maxlen = IFQ_MAXLEN;
561 	atintrq2.ifq_maxlen = IFQ_MAXLEN;
562 
563 	MOWNER_ATTACH(&atalk_tx_mowner);
564 	MOWNER_ATTACH(&atalk_rx_mowner);
565 }
566 
567 #if 0
568 static void
569 ddp_clean()
570 {
571 	struct ddpcb   *ddp;
572 
573 	for (ddp = ddpcb; ddp; ddp = ddp->ddp_next)
574 		at_pcbdetach(ddp->ddp_socket, ddp);
575 }
576 #endif
577