Home | History | Annotate | Line # | Download | only in netatalk
ddp_usrreq.c revision 1.2.14.1 
      1 /*	$NetBSD: ddp_usrreq.c,v 1.2.14.1 1998/12/11 04:53:06 kenh 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/errno.h>
     30 #include <sys/types.h>
     31 #include <sys/param.h>
     32 #include <sys/systm.h>
     33 #include <sys/proc.h>
     34 #include <sys/mbuf.h>
     35 #include <sys/ioctl.h>
     36 #include <sys/socket.h>
     37 #include <sys/socketvar.h>
     38 #include <sys/protosw.h>
     39 #include <net/if.h>
     40 #include <net/route.h>
     41 #include <net/if_ether.h>
     42 #include <netinet/in.h>
     43 
     44 #include <netatalk/at.h>
     45 #include <netatalk/at_var.h>
     46 #include <netatalk/ddp_var.h>
     47 #include <netatalk/aarp.h>
     48 #include <netatalk/at_extern.h>
     49 
     50 static void at_pcbdisconnect __P((struct ddpcb *));
     51 static void at_sockaddr __P((struct ddpcb *, struct mbuf *));
     52 static int at_pcbsetaddr __P((struct ddpcb *, struct mbuf *, struct proc *));
     53 static int at_pcbconnect __P((struct ddpcb *, struct mbuf *, struct proc *));
     54 static void at_pcbdetach __P((struct socket *, struct ddpcb *));
     55 static int at_pcballoc __P((struct socket *));
     56 
     57 struct ddpcb   *ddp_ports[ATPORT_LAST];
     58 struct ddpcb   *ddpcb = NULL;
     59 struct at_ifaddrhead at_ifaddr;		/* Here as inited in this file */
     60 u_long ddp_sendspace = DDP_MAXSZ;	/* Max ddp size + 1 (ddp_type) */
     61 u_long ddp_recvspace = 25 * (587 + sizeof(struct sockaddr_at));
     62 
     63 /* ARGSUSED */
     64 int
     65 ddp_usrreq(so, req, m, addr, rights, p)
     66 	struct socket  *so;
     67 	int             req;
     68 	struct mbuf    *m;
     69 	struct mbuf    *addr;
     70 	struct mbuf    *rights;
     71 	struct proc    *p;
     72 {
     73 	struct ddpcb   *ddp;
     74 	int             error = 0;
     75 
     76 	ddp = sotoddpcb(so);
     77 
     78 	if (req == PRU_CONTROL) {
     79 		return (at_control((long) m, (caddr_t) addr,
     80 		    (struct ifnet *) rights, (struct proc *) p));
     81 	}
     82 	if (rights && rights->m_len) {
     83 		error = EINVAL;
     84 		goto release;
     85 	}
     86 	if (ddp == NULL && req != PRU_ATTACH) {
     87 		error = EINVAL;
     88 		goto release;
     89 	}
     90 	switch (req) {
     91 	case PRU_ATTACH:
     92 		if (ddp != NULL) {
     93 			error = EINVAL;
     94 			break;
     95 		}
     96 		if ((error = at_pcballoc(so)) != 0) {
     97 			break;
     98 		}
     99 		error = soreserve(so, ddp_sendspace, ddp_recvspace);
    100 		break;
    101 
    102 	case PRU_DETACH:
    103 		at_pcbdetach(so, ddp);
    104 		break;
    105 
    106 	case PRU_BIND:
    107 		error = at_pcbsetaddr(ddp, addr, p);
    108 		break;
    109 
    110 	case PRU_SOCKADDR:
    111 		at_sockaddr(ddp, addr);
    112 		break;
    113 
    114 	case PRU_CONNECT:
    115 		if (ddp->ddp_fsat.sat_port != ATADDR_ANYPORT) {
    116 			error = EISCONN;
    117 			break;
    118 		}
    119 		error = at_pcbconnect(ddp, addr, p);
    120 		if (error == 0)
    121 			soisconnected(so);
    122 		break;
    123 
    124 	case PRU_DISCONNECT:
    125 		if (ddp->ddp_fsat.sat_addr.s_node == ATADDR_ANYNODE) {
    126 			error = ENOTCONN;
    127 			break;
    128 		}
    129 		at_pcbdisconnect(ddp);
    130 		soisdisconnected(so);
    131 		break;
    132 
    133 	case PRU_SHUTDOWN:
    134 		socantsendmore(so);
    135 		break;
    136 
    137 	case PRU_SEND:{
    138 			int s = 0;
    139 
    140 			if (addr) {
    141 				if (ddp->ddp_fsat.sat_port != ATADDR_ANYPORT) {
    142 					error = EISCONN;
    143 					break;
    144 				}
    145 				s = splnet();
    146 				error = at_pcbconnect(ddp, addr, p);
    147 				if (error) {
    148 					splx(s);
    149 					break;
    150 				}
    151 			} else {
    152 				if (ddp->ddp_fsat.sat_port == ATADDR_ANYPORT) {
    153 					error = ENOTCONN;
    154 					break;
    155 				}
    156 			}
    157 
    158 			error = ddp_output(m, ddp);
    159 			m = NULL;
    160 			if (addr) {
    161 				at_pcbdisconnect(ddp);
    162 				splx(s);
    163 			}
    164 		}
    165 		break;
    166 
    167 	case PRU_ABORT:
    168 		soisdisconnected(so);
    169 		at_pcbdetach(so, ddp);
    170 		break;
    171 
    172 	case PRU_LISTEN:
    173 	case PRU_CONNECT2:
    174 	case PRU_ACCEPT:
    175 	case PRU_SENDOOB:
    176 	case PRU_FASTTIMO:
    177 	case PRU_SLOWTIMO:
    178 	case PRU_PROTORCV:
    179 	case PRU_PROTOSEND:
    180 		error = EOPNOTSUPP;
    181 		break;
    182 
    183 	case PRU_RCVD:
    184 	case PRU_RCVOOB:
    185 		/*
    186 		 * Don't mfree. Good architecture...
    187 		 */
    188 		return (EOPNOTSUPP);
    189 
    190 	case PRU_SENSE:
    191 		/*
    192 		 * 1. Don't return block size.
    193 		 * 2. Don't mfree.
    194 		 */
    195 		return (0);
    196 
    197 	default:
    198 		error = EOPNOTSUPP;
    199 	}
    200 
    201 release:
    202 	if (m != NULL) {
    203 		m_freem(m);
    204 	}
    205 	return (error);
    206 }
    207 
    208 static void
    209 at_sockaddr(ddp, addr)
    210 	struct ddpcb   *ddp;
    211 	struct mbuf    *addr;
    212 {
    213 	struct sockaddr_at *sat;
    214 
    215 	addr->m_len = sizeof(struct sockaddr_at);
    216 	sat = mtod(addr, struct sockaddr_at *);
    217 	*sat = ddp->ddp_lsat;
    218 }
    219 
    220 static int
    221 at_pcbsetaddr(ddp, addr, p)
    222 	struct ddpcb   *ddp;
    223 	struct mbuf    *addr;
    224 	struct proc    *p;
    225 {
    226 	struct sockaddr_at lsat, *sat;
    227 	struct at_ifaddr *aa;
    228 	struct ddpcb   *ddpp;
    229 	int s;
    230 
    231 	if (ddp->ddp_lsat.sat_port != ATADDR_ANYPORT) {	/* shouldn't be bound */
    232 		return (EINVAL);
    233 	}
    234 	if (addr != 0) {	/* validate passed address */
    235 		sat = mtod(addr, struct sockaddr_at *);
    236 		if (addr->m_len != sizeof(*sat))
    237 			return (EINVAL);
    238 
    239 		if (sat->sat_family != AF_APPLETALK)
    240 			return (EAFNOSUPPORT);
    241 
    242 		if (sat->sat_addr.s_node != ATADDR_ANYNODE ||
    243 		    sat->sat_addr.s_net != ATADDR_ANYNET) {
    244 			s = splimp();
    245 			for (aa = at_ifaddr.tqh_first; aa;
    246 			    aa = aa->aa_list.tqe_next) {
    247 				if ((sat->sat_addr.s_net ==
    248 				    AA_SAT(aa)->sat_addr.s_net) &&
    249 				    (sat->sat_addr.s_node ==
    250 				    AA_SAT(aa)->sat_addr.s_node))
    251 					break;
    252 			}
    253 			splx(s);
    254 			if (!aa)
    255 				return (EADDRNOTAVAIL);
    256 		}
    257 		if (sat->sat_port != ATADDR_ANYPORT) {
    258 			if (sat->sat_port < ATPORT_FIRST ||
    259 			    sat->sat_port >= ATPORT_LAST)
    260 				return (EINVAL);
    261 
    262 			if (sat->sat_port < ATPORT_RESERVED &&
    263 			    suser(p->p_ucred, &p->p_acflag))
    264 				return (EACCES);
    265 		}
    266 	} else {
    267 		bzero((caddr_t) & lsat, sizeof(struct sockaddr_at));
    268 		lsat.sat_len = sizeof(struct sockaddr_at);
    269 		lsat.sat_addr.s_node = ATADDR_ANYNODE;
    270 		lsat.sat_addr.s_net = ATADDR_ANYNET;
    271 		lsat.sat_family = AF_APPLETALK;
    272 		sat = &lsat;
    273 	}
    274 
    275 	if (sat->sat_addr.s_node == ATADDR_ANYNODE &&
    276 	    sat->sat_addr.s_net == ATADDR_ANYNET) {
    277 		s = splimp();
    278 		if (at_ifaddr.tqh_first == NULL) {
    279 			splx(s);
    280 			return (EADDRNOTAVAIL);
    281 		}
    282 		sat->sat_addr = AA_SAT(at_ifaddr.tqh_first)->sat_addr;
    283 		splx(s);
    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 	int s;
    334 
    335 	if (addr->m_len != sizeof(*sat))
    336 		return (EINVAL);
    337 	if (sat->sat_family != AF_APPLETALK) {
    338 		return (EAFNOSUPPORT);
    339 	}
    340 	/*
    341          * Under phase 2, network 0 means "the network".  We take "the
    342          * network" to mean the network the control block is bound to.
    343          * If the control block is not bound, there is an error.
    344          */
    345 	if (sat->sat_addr.s_net == ATADDR_ANYNET
    346 	    && sat->sat_addr.s_node != ATADDR_ANYNODE) {
    347 		if (ddp->ddp_lsat.sat_port == ATADDR_ANYPORT) {
    348 			return (EADDRNOTAVAIL);
    349 		}
    350 		hintnet = ddp->ddp_lsat.sat_addr.s_net;
    351 	}
    352 	ro = &ddp->ddp_route;
    353 	/*
    354          * If we've got an old route for this pcb, check that it is valid.
    355          * If we've changed our address, we may have an old "good looking"
    356          * route here.  Attempt to detect it.
    357          */
    358 	if (ro->ro_rt) {
    359 		if (hintnet) {
    360 			net = hintnet;
    361 		} else {
    362 			net = sat->sat_addr.s_net;
    363 		}
    364 		aa = 0;
    365 		if ((ifp = ro->ro_rt->rt_ifp) != NULL) {
    366 			s = splimp();
    367 			for (aa = at_ifaddr.tqh_first; aa;
    368 			    aa = aa->aa_list.tqe_next) {
    369 				if (aa->aa_ifp == ifp &&
    370 				    ntohs(net) >= ntohs(aa->aa_firstnet) &&
    371 				    ntohs(net) <= ntohs(aa->aa_lastnet)) {
    372 					break;
    373 				}
    374 			}
    375 			splx(s);
    376 		}
    377 		if (aa == NULL || (satosat(&ro->ro_dst)->sat_addr.s_net !=
    378 		    (hintnet ? hintnet : sat->sat_addr.s_net) ||
    379 		    satosat(&ro->ro_dst)->sat_addr.s_node !=
    380 		    sat->sat_addr.s_node)) {
    381 			RTFREE(ro->ro_rt);
    382 			ro->ro_rt = (struct rtentry *) 0;
    383 		}
    384 	}
    385 	/*
    386          * If we've got no route for this interface, try to find one.
    387          */
    388 	if (ro->ro_rt == (struct rtentry *) 0 ||
    389 	    ro->ro_rt->rt_ifp == (struct ifnet *) 0) {
    390 		bzero(&ro->ro_dst, sizeof(struct sockaddr_at));
    391 		ro->ro_dst.sa_len = sizeof(struct sockaddr_at);
    392 		ro->ro_dst.sa_family = AF_APPLETALK;
    393 		if (hintnet) {
    394 			satosat(&ro->ro_dst)->sat_addr.s_net = hintnet;
    395 		} else {
    396 			satosat(&ro->ro_dst)->sat_addr.s_net =
    397 			    sat->sat_addr.s_net;
    398 		}
    399 		satosat(&ro->ro_dst)->sat_addr.s_node = sat->sat_addr.s_node;
    400 		rtalloc(ro);
    401 	}
    402 	/*
    403          * Make sure any route that we have has a valid interface.
    404          */
    405 	aa = 0;
    406 	if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp)) {
    407 		s = splimp();
    408 		for (aa = at_ifaddr.tqh_first; aa; aa = aa->aa_list.tqe_next) {
    409 			if (aa->aa_ifp == ifp) {
    410 				break;
    411 			}
    412 		}
    413 		splx(s);
    414 	}
    415 	if (aa == 0) {
    416 		return (ENETUNREACH);
    417 	}
    418 	ddp->ddp_fsat = *sat;
    419 	if (ddp->ddp_lsat.sat_port == ATADDR_ANYPORT) {
    420 		return (at_pcbsetaddr(ddp, (struct mbuf *) 0, p));
    421 	}
    422 	return (0);
    423 }
    424 
    425 static void
    426 at_pcbdisconnect(ddp)
    427 	struct ddpcb   *ddp;
    428 {
    429 	ddp->ddp_fsat.sat_addr.s_net = ATADDR_ANYNET;
    430 	ddp->ddp_fsat.sat_addr.s_node = ATADDR_ANYNODE;
    431 	ddp->ddp_fsat.sat_port = ATADDR_ANYPORT;
    432 }
    433 
    434 static int
    435 at_pcballoc(so)
    436 	struct socket  *so;
    437 {
    438 	struct ddpcb   *ddp;
    439 
    440 	MALLOC(ddp, struct ddpcb *, sizeof(*ddp), M_PCB, M_WAIT);
    441 	if (!ddp)
    442 		panic("at_pcballoc");
    443 	bzero((caddr_t) ddp, sizeof *ddp);
    444 	ddp->ddp_lsat.sat_port = ATADDR_ANYPORT;
    445 
    446 	ddp->ddp_next = ddpcb;
    447 	ddp->ddp_prev = NULL;
    448 	ddp->ddp_pprev = NULL;
    449 	ddp->ddp_pnext = NULL;
    450 	if (ddpcb) {
    451 		ddpcb->ddp_prev = ddp;
    452 	}
    453 	ddpcb = ddp;
    454 
    455 	ddp->ddp_socket = so;
    456 	so->so_pcb = (caddr_t) ddp;
    457 	return (0);
    458 }
    459 
    460 static void
    461 at_pcbdetach(so, ddp)
    462 	struct socket  *so;
    463 	struct ddpcb   *ddp;
    464 {
    465 	soisdisconnected(so);
    466 	so->so_pcb = 0;
    467 	sofree(so);
    468 
    469 	/* remove ddp from ddp_ports list */
    470 	if (ddp->ddp_lsat.sat_port != ATADDR_ANYPORT &&
    471 	    ddp_ports[ddp->ddp_lsat.sat_port - 1] != NULL) {
    472 		if (ddp->ddp_pprev != NULL) {
    473 			ddp->ddp_pprev->ddp_pnext = ddp->ddp_pnext;
    474 		} else {
    475 			ddp_ports[ddp->ddp_lsat.sat_port - 1] = ddp->ddp_pnext;
    476 		}
    477 		if (ddp->ddp_pnext != NULL) {
    478 			ddp->ddp_pnext->ddp_pprev = ddp->ddp_pprev;
    479 		}
    480 	}
    481 	if (ddp->ddp_route.ro_rt) {
    482 		rtfree(ddp->ddp_route.ro_rt);
    483 	}
    484 	if (ddp->ddp_prev) {
    485 		ddp->ddp_prev->ddp_next = ddp->ddp_next;
    486 	} else {
    487 		ddpcb = ddp->ddp_next;
    488 	}
    489 	if (ddp->ddp_next) {
    490 		ddp->ddp_next->ddp_prev = ddp->ddp_prev;
    491 	}
    492 	free(ddp, M_PCB);
    493 }
    494 
    495 /*
    496  * For the moment, this just find the pcb with the correct local address.
    497  * In the future, this will actually do some real searching, so we can use
    498  * the sender's address to do de-multiplexing on a single port to many
    499  * sockets (pcbs).
    500  */
    501 struct ddpcb   *
    502 ddp_search(from, to, aa)
    503 	struct sockaddr_at *from;
    504 	struct sockaddr_at *to;
    505 	struct at_ifaddr *aa;
    506 {
    507 	struct ddpcb   *ddp;
    508 
    509 	/*
    510          * Check for bad ports.
    511          */
    512 	if (to->sat_port < ATPORT_FIRST || to->sat_port >= ATPORT_LAST) {
    513 		return (NULL);
    514 	}
    515 	/*
    516          * Make sure the local address matches the sent address.  What about
    517          * the interface?
    518          */
    519 	for (ddp = ddp_ports[to->sat_port - 1]; ddp; ddp = ddp->ddp_pnext) {
    520 		/* XXX should we handle 0.YY? */
    521 
    522 		/* XXXX.YY to socket on destination interface */
    523 		if (to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net &&
    524 		    to->sat_addr.s_node == ddp->ddp_lsat.sat_addr.s_node) {
    525 			break;
    526 		}
    527 		/* All the following tests require aa != NULL, so.... */
    528 		if (aa == NULL)
    529 			continue;
    530 		/* 0.255 to socket on receiving interface */
    531 		if (to->sat_addr.s_node == ATADDR_BCAST &&
    532 		    (to->sat_addr.s_net == 0 ||
    533 		    to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net) &&
    534 		ddp->ddp_lsat.sat_addr.s_net == AA_SAT(aa)->sat_addr.s_net) {
    535 			break;
    536 		}
    537 		/* XXXX.0 to socket on destination interface */
    538 		if (to->sat_addr.s_net == aa->aa_firstnet &&
    539 		    to->sat_addr.s_node == 0 &&
    540 		    ntohs(ddp->ddp_lsat.sat_addr.s_net) >=
    541 		    ntohs(aa->aa_firstnet) &&
    542 		    ntohs(ddp->ddp_lsat.sat_addr.s_net) <=
    543 		    ntohs(aa->aa_lastnet)) {
    544 			break;
    545 		}
    546 	}
    547 	return (ddp);
    548 }
    549 
    550 /*
    551  * Initialize all the ddp & appletalk stuff
    552  */
    553 void
    554 ddp_init()
    555 {
    556 	TAILQ_INIT(&at_ifaddr);
    557 	atintrq1.ifq_maxlen = IFQ_MAXLEN;
    558 	atintrq2.ifq_maxlen = IFQ_MAXLEN;
    559 }
    560 
    561 #if 0
    562 static void
    563 ddp_clean()
    564 {
    565 	struct ddpcb   *ddp;
    566 
    567 	for (ddp = ddpcb; ddp; ddp = ddp->ddp_next)
    568 		at_pcbdetach(ddp->ddp_socket, ddp);
    569 }
    570 #endif
    571