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ddp_usrreq.c revision 1.4.6.1 
      1 /*	$NetBSD: ddp_usrreq.c,v 1.4.6.1 2001/11/14 19:17:34 nathanw 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 (at) umich.edu
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: ddp_usrreq.c,v 1.4.6.1 2001/11/14 19:17:34 nathanw Exp $");
     31 
     32 #include <sys/errno.h>
     33 #include <sys/types.h>
     34 #include <sys/param.h>
     35 #include <sys/systm.h>
     36 #include <sys/proc.h>
     37 #include <sys/mbuf.h>
     38 #include <sys/ioctl.h>
     39 #include <sys/socket.h>
     40 #include <sys/socketvar.h>
     41 #include <sys/protosw.h>
     42 #include <net/if.h>
     43 #include <net/route.h>
     44 #include <net/if_ether.h>
     45 #include <netinet/in.h>
     46 
     47 #include <netatalk/at.h>
     48 #include <netatalk/at_var.h>
     49 #include <netatalk/ddp_var.h>
     50 #include <netatalk/aarp.h>
     51 #include <netatalk/at_extern.h>
     52 
     53 static void at_pcbdisconnect __P((struct ddpcb *));
     54 static void at_sockaddr __P((struct ddpcb *, struct mbuf *));
     55 static int at_pcbsetaddr __P((struct ddpcb *, struct mbuf *, struct proc *));
     56 static int at_pcbconnect __P((struct ddpcb *, struct mbuf *, struct proc *));
     57 static void at_pcbdetach __P((struct socket *, struct ddpcb *));
     58 static int at_pcballoc __P((struct socket *));
     59 
     60 struct ddpcb   *ddp_ports[ATPORT_LAST];
     61 struct ddpcb   *ddpcb = NULL;
     62 struct at_ifaddrhead at_ifaddr;		/* Here as inited in this file */
     63 u_long ddp_sendspace = DDP_MAXSZ;	/* Max ddp size + 1 (ddp_type) */
     64 u_long ddp_recvspace = 25 * (587 + sizeof(struct sockaddr_at));
     65 
     66 /* ARGSUSED */
     67 int
     68 ddp_usrreq(so, req, m, addr, rights, p)
     69 	struct socket  *so;
     70 	int             req;
     71 	struct mbuf    *m;
     72 	struct mbuf    *addr;
     73 	struct mbuf    *rights;
     74 	struct proc    *p;
     75 {
     76 	struct ddpcb   *ddp;
     77 	int             error = 0;
     78 
     79 	ddp = sotoddpcb(so);
     80 
     81 	if (req == PRU_CONTROL) {
     82 		return (at_control((long) m, (caddr_t) addr,
     83 		    (struct ifnet *) rights, (struct proc *) p));
     84 	}
     85 	if (req == PRU_PURGEIF) {
     86 		at_purgeif((struct ifnet *) rights);
     87 		return (0);
     88 	}
     89 	if (rights && rights->m_len) {
     90 		error = EINVAL;
     91 		goto release;
     92 	}
     93 	if (ddp == NULL && req != PRU_ATTACH) {
     94 		error = EINVAL;
     95 		goto release;
     96 	}
     97 	switch (req) {
     98 	case PRU_ATTACH:
     99 		if (ddp != NULL) {
    100 			error = EINVAL;
    101 			break;
    102 		}
    103 		if ((error = at_pcballoc(so)) != 0) {
    104 			break;
    105 		}
    106 		error = soreserve(so, ddp_sendspace, ddp_recvspace);
    107 		break;
    108 
    109 	case PRU_DETACH:
    110 		at_pcbdetach(so, ddp);
    111 		break;
    112 
    113 	case PRU_BIND:
    114 		error = at_pcbsetaddr(ddp, addr, p);
    115 		break;
    116 
    117 	case PRU_SOCKADDR:
    118 		at_sockaddr(ddp, addr);
    119 		break;
    120 
    121 	case PRU_CONNECT:
    122 		if (ddp->ddp_fsat.sat_port != ATADDR_ANYPORT) {
    123 			error = EISCONN;
    124 			break;
    125 		}
    126 		error = at_pcbconnect(ddp, addr, p);
    127 		if (error == 0)
    128 			soisconnected(so);
    129 		break;
    130 
    131 	case PRU_DISCONNECT:
    132 		if (ddp->ddp_fsat.sat_addr.s_node == ATADDR_ANYNODE) {
    133 			error = ENOTCONN;
    134 			break;
    135 		}
    136 		at_pcbdisconnect(ddp);
    137 		soisdisconnected(so);
    138 		break;
    139 
    140 	case PRU_SHUTDOWN:
    141 		socantsendmore(so);
    142 		break;
    143 
    144 	case PRU_SEND:{
    145 			int s = 0;
    146 
    147 			if (addr) {
    148 				if (ddp->ddp_fsat.sat_port != ATADDR_ANYPORT) {
    149 					error = EISCONN;
    150 					break;
    151 				}
    152 				s = splnet();
    153 				error = at_pcbconnect(ddp, addr, p);
    154 				if (error) {
    155 					splx(s);
    156 					break;
    157 				}
    158 			} else {
    159 				if (ddp->ddp_fsat.sat_port == ATADDR_ANYPORT) {
    160 					error = ENOTCONN;
    161 					break;
    162 				}
    163 			}
    164 
    165 			error = ddp_output(m, ddp);
    166 			m = NULL;
    167 			if (addr) {
    168 				at_pcbdisconnect(ddp);
    169 				splx(s);
    170 			}
    171 		}
    172 		break;
    173 
    174 	case PRU_ABORT:
    175 		soisdisconnected(so);
    176 		at_pcbdetach(so, ddp);
    177 		break;
    178 
    179 	case PRU_LISTEN:
    180 	case PRU_CONNECT2:
    181 	case PRU_ACCEPT:
    182 	case PRU_SENDOOB:
    183 	case PRU_FASTTIMO:
    184 	case PRU_SLOWTIMO:
    185 	case PRU_PROTORCV:
    186 	case PRU_PROTOSEND:
    187 		error = EOPNOTSUPP;
    188 		break;
    189 
    190 	case PRU_RCVD:
    191 	case PRU_RCVOOB:
    192 		/*
    193 		 * Don't mfree. Good architecture...
    194 		 */
    195 		return (EOPNOTSUPP);
    196 
    197 	case PRU_SENSE:
    198 		/*
    199 		 * 1. Don't return block size.
    200 		 * 2. Don't mfree.
    201 		 */
    202 		return (0);
    203 
    204 	default:
    205 		error = EOPNOTSUPP;
    206 	}
    207 
    208 release:
    209 	if (m != NULL) {
    210 		m_freem(m);
    211 	}
    212 	return (error);
    213 }
    214 
    215 static void
    216 at_sockaddr(ddp, addr)
    217 	struct ddpcb   *ddp;
    218 	struct mbuf    *addr;
    219 {
    220 	struct sockaddr_at *sat;
    221 
    222 	addr->m_len = sizeof(struct sockaddr_at);
    223 	sat = mtod(addr, struct sockaddr_at *);
    224 	*sat = ddp->ddp_lsat;
    225 }
    226 
    227 static int
    228 at_pcbsetaddr(ddp, addr, p)
    229 	struct ddpcb   *ddp;
    230 	struct mbuf    *addr;
    231 	struct proc    *p;
    232 {
    233 	struct sockaddr_at lsat, *sat;
    234 	struct at_ifaddr *aa;
    235 	struct ddpcb   *ddpp;
    236 
    237 	if (ddp->ddp_lsat.sat_port != ATADDR_ANYPORT) {	/* shouldn't be bound */
    238 		return (EINVAL);
    239 	}
    240 	if (addr != 0) {	/* validate passed address */
    241 		sat = mtod(addr, struct sockaddr_at *);
    242 		if (addr->m_len != sizeof(*sat))
    243 			return (EINVAL);
    244 
    245 		if (sat->sat_family != AF_APPLETALK)
    246 			return (EAFNOSUPPORT);
    247 
    248 		if (sat->sat_addr.s_node != ATADDR_ANYNODE ||
    249 		    sat->sat_addr.s_net != ATADDR_ANYNET) {
    250 			for (aa = at_ifaddr.tqh_first; aa;
    251 			    aa = aa->aa_list.tqe_next) {
    252 				if ((sat->sat_addr.s_net ==
    253 				    AA_SAT(aa)->sat_addr.s_net) &&
    254 				    (sat->sat_addr.s_node ==
    255 				    AA_SAT(aa)->sat_addr.s_node))
    256 					break;
    257 			}
    258 			if (!aa)
    259 				return (EADDRNOTAVAIL);
    260 		}
    261 		if (sat->sat_port != ATADDR_ANYPORT) {
    262 			if (sat->sat_port < ATPORT_FIRST ||
    263 			    sat->sat_port >= ATPORT_LAST)
    264 				return (EINVAL);
    265 
    266 			if (sat->sat_port < ATPORT_RESERVED &&
    267 			    suser(p->p_ucred, &p->p_acflag))
    268 				return (EACCES);
    269 		}
    270 	} else {
    271 		bzero((caddr_t) & lsat, sizeof(struct sockaddr_at));
    272 		lsat.sat_len = sizeof(struct sockaddr_at);
    273 		lsat.sat_addr.s_node = ATADDR_ANYNODE;
    274 		lsat.sat_addr.s_net = ATADDR_ANYNET;
    275 		lsat.sat_family = AF_APPLETALK;
    276 		sat = &lsat;
    277 	}
    278 
    279 	if (sat->sat_addr.s_node == ATADDR_ANYNODE &&
    280 	    sat->sat_addr.s_net == ATADDR_ANYNET) {
    281 		if (at_ifaddr.tqh_first == NULL)
    282 			return (EADDRNOTAVAIL);
    283 		sat->sat_addr = AA_SAT(at_ifaddr.tqh_first)->sat_addr;
    284 	}
    285 	ddp->ddp_lsat = *sat;
    286 
    287 	/*
    288          * Choose port.
    289          */
    290 	if (sat->sat_port == ATADDR_ANYPORT) {
    291 		for (sat->sat_port = ATPORT_RESERVED;
    292 		     sat->sat_port < ATPORT_LAST; sat->sat_port++) {
    293 			if (ddp_ports[sat->sat_port - 1] == 0)
    294 				break;
    295 		}
    296 		if (sat->sat_port == ATPORT_LAST) {
    297 			return (EADDRNOTAVAIL);
    298 		}
    299 		ddp->ddp_lsat.sat_port = sat->sat_port;
    300 		ddp_ports[sat->sat_port - 1] = ddp;
    301 	} else {
    302 		for (ddpp = ddp_ports[sat->sat_port - 1]; ddpp;
    303 		     ddpp = ddpp->ddp_pnext) {
    304 			if (ddpp->ddp_lsat.sat_addr.s_net ==
    305 			    sat->sat_addr.s_net &&
    306 			    ddpp->ddp_lsat.sat_addr.s_node ==
    307 			    sat->sat_addr.s_node)
    308 				break;
    309 		}
    310 		if (ddpp != NULL)
    311 			return (EADDRINUSE);
    312 
    313 		ddp->ddp_pnext = ddp_ports[sat->sat_port - 1];
    314 		ddp_ports[sat->sat_port - 1] = ddp;
    315 		if (ddp->ddp_pnext)
    316 			ddp->ddp_pnext->ddp_pprev = ddp;
    317 	}
    318 
    319 	return 0;
    320 }
    321 
    322 static int
    323 at_pcbconnect(ddp, addr, p)
    324 	struct ddpcb   *ddp;
    325 	struct mbuf    *addr;
    326 	struct proc    *p;
    327 {
    328 	struct sockaddr_at *sat = mtod(addr, struct sockaddr_at *);
    329 	struct route   *ro;
    330 	struct at_ifaddr *aa = 0;
    331 	struct ifnet   *ifp;
    332 	u_short         hintnet = 0, net;
    333 
    334 	if (addr->m_len != sizeof(*sat))
    335 		return (EINVAL);
    336 	if (sat->sat_family != AF_APPLETALK) {
    337 		return (EAFNOSUPPORT);
    338 	}
    339 	/*
    340          * Under phase 2, network 0 means "the network".  We take "the
    341          * network" to mean the network the control block is bound to.
    342          * If the control block is not bound, there is an error.
    343          */
    344 	if (sat->sat_addr.s_net == ATADDR_ANYNET
    345 	    && sat->sat_addr.s_node != ATADDR_ANYNODE) {
    346 		if (ddp->ddp_lsat.sat_port == ATADDR_ANYPORT) {
    347 			return (EADDRNOTAVAIL);
    348 		}
    349 		hintnet = ddp->ddp_lsat.sat_addr.s_net;
    350 	}
    351 	ro = &ddp->ddp_route;
    352 	/*
    353          * If we've got an old route for this pcb, check that it is valid.
    354          * If we've changed our address, we may have an old "good looking"
    355          * route here.  Attempt to detect it.
    356          */
    357 	if (ro->ro_rt) {
    358 		if (hintnet) {
    359 			net = hintnet;
    360 		} else {
    361 			net = sat->sat_addr.s_net;
    362 		}
    363 		aa = 0;
    364 		if ((ifp = ro->ro_rt->rt_ifp) != NULL) {
    365 			for (aa = at_ifaddr.tqh_first; aa;
    366 			    aa = aa->aa_list.tqe_next) {
    367 				if (aa->aa_ifp == ifp &&
    368 				    ntohs(net) >= ntohs(aa->aa_firstnet) &&
    369 				    ntohs(net) <= ntohs(aa->aa_lastnet)) {
    370 					break;
    371 				}
    372 			}
    373 		}
    374 		if (aa == NULL || (satosat(&ro->ro_dst)->sat_addr.s_net !=
    375 		    (hintnet ? hintnet : sat->sat_addr.s_net) ||
    376 		    satosat(&ro->ro_dst)->sat_addr.s_node !=
    377 		    sat->sat_addr.s_node)) {
    378 			RTFREE(ro->ro_rt);
    379 			ro->ro_rt = (struct rtentry *) 0;
    380 		}
    381 	}
    382 	/*
    383          * If we've got no route for this interface, try to find one.
    384          */
    385 	if (ro->ro_rt == (struct rtentry *) 0 ||
    386 	    ro->ro_rt->rt_ifp == (struct ifnet *) 0) {
    387 		bzero(&ro->ro_dst, sizeof(struct sockaddr_at));
    388 		ro->ro_dst.sa_len = sizeof(struct sockaddr_at);
    389 		ro->ro_dst.sa_family = AF_APPLETALK;
    390 		if (hintnet) {
    391 			satosat(&ro->ro_dst)->sat_addr.s_net = hintnet;
    392 		} else {
    393 			satosat(&ro->ro_dst)->sat_addr.s_net =
    394 			    sat->sat_addr.s_net;
    395 		}
    396 		satosat(&ro->ro_dst)->sat_addr.s_node = sat->sat_addr.s_node;
    397 		rtalloc(ro);
    398 	}
    399 	/*
    400          * Make sure any route that we have has a valid interface.
    401          */
    402 	aa = 0;
    403 	if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp)) {
    404 		for (aa = at_ifaddr.tqh_first; aa; aa = aa->aa_list.tqe_next) {
    405 			if (aa->aa_ifp == ifp) {
    406 				break;
    407 			}
    408 		}
    409 	}
    410 	if (aa == 0) {
    411 		return (ENETUNREACH);
    412 	}
    413 	ddp->ddp_fsat = *sat;
    414 	if (ddp->ddp_lsat.sat_port == ATADDR_ANYPORT) {
    415 		return (at_pcbsetaddr(ddp, (struct mbuf *) 0, p));
    416 	}
    417 	return (0);
    418 }
    419 
    420 static void
    421 at_pcbdisconnect(ddp)
    422 	struct ddpcb   *ddp;
    423 {
    424 	ddp->ddp_fsat.sat_addr.s_net = ATADDR_ANYNET;
    425 	ddp->ddp_fsat.sat_addr.s_node = ATADDR_ANYNODE;
    426 	ddp->ddp_fsat.sat_port = ATADDR_ANYPORT;
    427 }
    428 
    429 static int
    430 at_pcballoc(so)
    431 	struct socket  *so;
    432 {
    433 	struct ddpcb   *ddp;
    434 
    435 	MALLOC(ddp, struct ddpcb *, sizeof(*ddp), M_PCB, M_WAIT);
    436 	if (!ddp)
    437 		panic("at_pcballoc");
    438 	bzero((caddr_t) ddp, sizeof *ddp);
    439 	ddp->ddp_lsat.sat_port = ATADDR_ANYPORT;
    440 
    441 	ddp->ddp_next = ddpcb;
    442 	ddp->ddp_prev = NULL;
    443 	ddp->ddp_pprev = NULL;
    444 	ddp->ddp_pnext = NULL;
    445 	if (ddpcb) {
    446 		ddpcb->ddp_prev = ddp;
    447 	}
    448 	ddpcb = ddp;
    449 
    450 	ddp->ddp_socket = so;
    451 	so->so_pcb = (caddr_t) ddp;
    452 	return (0);
    453 }
    454 
    455 static void
    456 at_pcbdetach(so, ddp)
    457 	struct socket  *so;
    458 	struct ddpcb   *ddp;
    459 {
    460 	soisdisconnected(so);
    461 	so->so_pcb = 0;
    462 	sofree(so);
    463 
    464 	/* remove ddp from ddp_ports list */
    465 	if (ddp->ddp_lsat.sat_port != ATADDR_ANYPORT &&
    466 	    ddp_ports[ddp->ddp_lsat.sat_port - 1] != NULL) {
    467 		if (ddp->ddp_pprev != NULL) {
    468 			ddp->ddp_pprev->ddp_pnext = ddp->ddp_pnext;
    469 		} else {
    470 			ddp_ports[ddp->ddp_lsat.sat_port - 1] = ddp->ddp_pnext;
    471 		}
    472 		if (ddp->ddp_pnext != NULL) {
    473 			ddp->ddp_pnext->ddp_pprev = ddp->ddp_pprev;
    474 		}
    475 	}
    476 	if (ddp->ddp_route.ro_rt) {
    477 		rtfree(ddp->ddp_route.ro_rt);
    478 	}
    479 	if (ddp->ddp_prev) {
    480 		ddp->ddp_prev->ddp_next = ddp->ddp_next;
    481 	} else {
    482 		ddpcb = ddp->ddp_next;
    483 	}
    484 	if (ddp->ddp_next) {
    485 		ddp->ddp_next->ddp_prev = ddp->ddp_prev;
    486 	}
    487 	free(ddp, M_PCB);
    488 }
    489 
    490 /*
    491  * For the moment, this just find the pcb with the correct local address.
    492  * In the future, this will actually do some real searching, so we can use
    493  * the sender's address to do de-multiplexing on a single port to many
    494  * sockets (pcbs).
    495  */
    496 struct ddpcb   *
    497 ddp_search(from, to, aa)
    498 	struct sockaddr_at *from;
    499 	struct sockaddr_at *to;
    500 	struct at_ifaddr *aa;
    501 {
    502 	struct ddpcb   *ddp;
    503 
    504 	/*
    505          * Check for bad ports.
    506          */
    507 	if (to->sat_port < ATPORT_FIRST || to->sat_port >= ATPORT_LAST) {
    508 		return (NULL);
    509 	}
    510 	/*
    511          * Make sure the local address matches the sent address.  What about
    512          * the interface?
    513          */
    514 	for (ddp = ddp_ports[to->sat_port - 1]; ddp; ddp = ddp->ddp_pnext) {
    515 		/* XXX should we handle 0.YY? */
    516 
    517 		/* XXXX.YY to socket on destination interface */
    518 		if (to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net &&
    519 		    to->sat_addr.s_node == ddp->ddp_lsat.sat_addr.s_node) {
    520 			break;
    521 		}
    522 		/* 0.255 to socket on receiving interface */
    523 		if (to->sat_addr.s_node == ATADDR_BCAST &&
    524 		    (to->sat_addr.s_net == 0 ||
    525 		    to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net) &&
    526 		ddp->ddp_lsat.sat_addr.s_net == AA_SAT(aa)->sat_addr.s_net) {
    527 			break;
    528 		}
    529 		/* XXXX.0 to socket on destination interface */
    530 		if (to->sat_addr.s_net == aa->aa_firstnet &&
    531 		    to->sat_addr.s_node == 0 &&
    532 		    ntohs(ddp->ddp_lsat.sat_addr.s_net) >=
    533 		    ntohs(aa->aa_firstnet) &&
    534 		    ntohs(ddp->ddp_lsat.sat_addr.s_net) <=
    535 		    ntohs(aa->aa_lastnet)) {
    536 			break;
    537 		}
    538 	}
    539 	return (ddp);
    540 }
    541 
    542 /*
    543  * Initialize all the ddp & appletalk stuff
    544  */
    545 void
    546 ddp_init()
    547 {
    548 	TAILQ_INIT(&at_ifaddr);
    549 	atintrq1.ifq_maxlen = IFQ_MAXLEN;
    550 	atintrq2.ifq_maxlen = IFQ_MAXLEN;
    551 }
    552 
    553 #if 0
    554 static void
    555 ddp_clean()
    556 {
    557 	struct ddpcb   *ddp;
    558 
    559 	for (ddp = ddpcb; ddp; ddp = ddp->ddp_next)
    560 		at_pcbdetach(ddp->ddp_socket, ddp);
    561 }
    562 #endif
    563