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ddp_usrreq.c revision 1.2 
      1 /*	$NetBSD: ddp_usrreq.c,v 1.2 1997/04/29 13:44:47 christos 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 
    230 	if (ddp->ddp_lsat.sat_port != ATADDR_ANYPORT) {	/* shouldn't be bound */
    231 		return (EINVAL);
    232 	}
    233 	if (addr != 0) {	/* validate passed address */
    234 		sat = mtod(addr, struct sockaddr_at *);
    235 		if (addr->m_len != sizeof(*sat))
    236 			return (EINVAL);
    237 
    238 		if (sat->sat_family != AF_APPLETALK)
    239 			return (EAFNOSUPPORT);
    240 
    241 		if (sat->sat_addr.s_node != ATADDR_ANYNODE ||
    242 		    sat->sat_addr.s_net != ATADDR_ANYNET) {
    243 			for (aa = at_ifaddr.tqh_first; aa;
    244 			    aa = aa->aa_list.tqe_next) {
    245 				if ((sat->sat_addr.s_net ==
    246 				    AA_SAT(aa)->sat_addr.s_net) &&
    247 				    (sat->sat_addr.s_node ==
    248 				    AA_SAT(aa)->sat_addr.s_node))
    249 					break;
    250 			}
    251 			if (!aa)
    252 				return (EADDRNOTAVAIL);
    253 		}
    254 		if (sat->sat_port != ATADDR_ANYPORT) {
    255 			if (sat->sat_port < ATPORT_FIRST ||
    256 			    sat->sat_port >= ATPORT_LAST)
    257 				return (EINVAL);
    258 
    259 			if (sat->sat_port < ATPORT_RESERVED &&
    260 			    suser(p->p_ucred, &p->p_acflag))
    261 				return (EACCES);
    262 		}
    263 	} else {
    264 		bzero((caddr_t) & lsat, sizeof(struct sockaddr_at));
    265 		lsat.sat_len = sizeof(struct sockaddr_at);
    266 		lsat.sat_addr.s_node = ATADDR_ANYNODE;
    267 		lsat.sat_addr.s_net = ATADDR_ANYNET;
    268 		lsat.sat_family = AF_APPLETALK;
    269 		sat = &lsat;
    270 	}
    271 
    272 	if (sat->sat_addr.s_node == ATADDR_ANYNODE &&
    273 	    sat->sat_addr.s_net == ATADDR_ANYNET) {
    274 		if (at_ifaddr.tqh_first == NULL)
    275 			return (EADDRNOTAVAIL);
    276 		sat->sat_addr = AA_SAT(at_ifaddr.tqh_first)->sat_addr;
    277 	}
    278 	ddp->ddp_lsat = *sat;
    279 
    280 	/*
    281          * Choose port.
    282          */
    283 	if (sat->sat_port == ATADDR_ANYPORT) {
    284 		for (sat->sat_port = ATPORT_RESERVED;
    285 		     sat->sat_port < ATPORT_LAST; sat->sat_port++) {
    286 			if (ddp_ports[sat->sat_port - 1] == 0)
    287 				break;
    288 		}
    289 		if (sat->sat_port == ATPORT_LAST) {
    290 			return (EADDRNOTAVAIL);
    291 		}
    292 		ddp->ddp_lsat.sat_port = sat->sat_port;
    293 		ddp_ports[sat->sat_port - 1] = ddp;
    294 	} else {
    295 		for (ddpp = ddp_ports[sat->sat_port - 1]; ddpp;
    296 		     ddpp = ddpp->ddp_pnext) {
    297 			if (ddpp->ddp_lsat.sat_addr.s_net ==
    298 			    sat->sat_addr.s_net &&
    299 			    ddpp->ddp_lsat.sat_addr.s_node ==
    300 			    sat->sat_addr.s_node)
    301 				break;
    302 		}
    303 		if (ddpp != NULL)
    304 			return (EADDRINUSE);
    305 
    306 		ddp->ddp_pnext = ddp_ports[sat->sat_port - 1];
    307 		ddp_ports[sat->sat_port - 1] = ddp;
    308 		if (ddp->ddp_pnext)
    309 			ddp->ddp_pnext->ddp_pprev = ddp;
    310 	}
    311 
    312 	return 0;
    313 }
    314 
    315 static int
    316 at_pcbconnect(ddp, addr, p)
    317 	struct ddpcb   *ddp;
    318 	struct mbuf    *addr;
    319 	struct proc    *p;
    320 {
    321 	struct sockaddr_at *sat = mtod(addr, struct sockaddr_at *);
    322 	struct route   *ro;
    323 	struct at_ifaddr *aa = 0;
    324 	struct ifnet   *ifp;
    325 	u_short         hintnet = 0, net;
    326 
    327 	if (addr->m_len != sizeof(*sat))
    328 		return (EINVAL);
    329 	if (sat->sat_family != AF_APPLETALK) {
    330 		return (EAFNOSUPPORT);
    331 	}
    332 	/*
    333          * Under phase 2, network 0 means "the network".  We take "the
    334          * network" to mean the network the control block is bound to.
    335          * If the control block is not bound, there is an error.
    336          */
    337 	if (sat->sat_addr.s_net == ATADDR_ANYNET
    338 	    && sat->sat_addr.s_node != ATADDR_ANYNODE) {
    339 		if (ddp->ddp_lsat.sat_port == ATADDR_ANYPORT) {
    340 			return (EADDRNOTAVAIL);
    341 		}
    342 		hintnet = ddp->ddp_lsat.sat_addr.s_net;
    343 	}
    344 	ro = &ddp->ddp_route;
    345 	/*
    346          * If we've got an old route for this pcb, check that it is valid.
    347          * If we've changed our address, we may have an old "good looking"
    348          * route here.  Attempt to detect it.
    349          */
    350 	if (ro->ro_rt) {
    351 		if (hintnet) {
    352 			net = hintnet;
    353 		} else {
    354 			net = sat->sat_addr.s_net;
    355 		}
    356 		aa = 0;
    357 		if ((ifp = ro->ro_rt->rt_ifp) != NULL) {
    358 			for (aa = at_ifaddr.tqh_first; aa;
    359 			    aa = aa->aa_list.tqe_next) {
    360 				if (aa->aa_ifp == ifp &&
    361 				    ntohs(net) >= ntohs(aa->aa_firstnet) &&
    362 				    ntohs(net) <= ntohs(aa->aa_lastnet)) {
    363 					break;
    364 				}
    365 			}
    366 		}
    367 		if (aa == NULL || (satosat(&ro->ro_dst)->sat_addr.s_net !=
    368 		    (hintnet ? hintnet : sat->sat_addr.s_net) ||
    369 		    satosat(&ro->ro_dst)->sat_addr.s_node !=
    370 		    sat->sat_addr.s_node)) {
    371 			RTFREE(ro->ro_rt);
    372 			ro->ro_rt = (struct rtentry *) 0;
    373 		}
    374 	}
    375 	/*
    376          * If we've got no route for this interface, try to find one.
    377          */
    378 	if (ro->ro_rt == (struct rtentry *) 0 ||
    379 	    ro->ro_rt->rt_ifp == (struct ifnet *) 0) {
    380 		bzero(&ro->ro_dst, sizeof(struct sockaddr_at));
    381 		ro->ro_dst.sa_len = sizeof(struct sockaddr_at);
    382 		ro->ro_dst.sa_family = AF_APPLETALK;
    383 		if (hintnet) {
    384 			satosat(&ro->ro_dst)->sat_addr.s_net = hintnet;
    385 		} else {
    386 			satosat(&ro->ro_dst)->sat_addr.s_net =
    387 			    sat->sat_addr.s_net;
    388 		}
    389 		satosat(&ro->ro_dst)->sat_addr.s_node = sat->sat_addr.s_node;
    390 		rtalloc(ro);
    391 	}
    392 	/*
    393          * Make sure any route that we have has a valid interface.
    394          */
    395 	aa = 0;
    396 	if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp)) {
    397 		for (aa = at_ifaddr.tqh_first; aa; aa = aa->aa_list.tqe_next) {
    398 			if (aa->aa_ifp == ifp) {
    399 				break;
    400 			}
    401 		}
    402 	}
    403 	if (aa == 0) {
    404 		return (ENETUNREACH);
    405 	}
    406 	ddp->ddp_fsat = *sat;
    407 	if (ddp->ddp_lsat.sat_port == ATADDR_ANYPORT) {
    408 		return (at_pcbsetaddr(ddp, (struct mbuf *) 0, p));
    409 	}
    410 	return (0);
    411 }
    412 
    413 static void
    414 at_pcbdisconnect(ddp)
    415 	struct ddpcb   *ddp;
    416 {
    417 	ddp->ddp_fsat.sat_addr.s_net = ATADDR_ANYNET;
    418 	ddp->ddp_fsat.sat_addr.s_node = ATADDR_ANYNODE;
    419 	ddp->ddp_fsat.sat_port = ATADDR_ANYPORT;
    420 }
    421 
    422 static int
    423 at_pcballoc(so)
    424 	struct socket  *so;
    425 {
    426 	struct ddpcb   *ddp;
    427 
    428 	MALLOC(ddp, struct ddpcb *, sizeof(*ddp), M_PCB, M_WAIT);
    429 	if (!ddp)
    430 		panic("at_pcballoc");
    431 	bzero((caddr_t) ddp, sizeof *ddp);
    432 	ddp->ddp_lsat.sat_port = ATADDR_ANYPORT;
    433 
    434 	ddp->ddp_next = ddpcb;
    435 	ddp->ddp_prev = NULL;
    436 	ddp->ddp_pprev = NULL;
    437 	ddp->ddp_pnext = NULL;
    438 	if (ddpcb) {
    439 		ddpcb->ddp_prev = ddp;
    440 	}
    441 	ddpcb = ddp;
    442 
    443 	ddp->ddp_socket = so;
    444 	so->so_pcb = (caddr_t) ddp;
    445 	return (0);
    446 }
    447 
    448 static void
    449 at_pcbdetach(so, ddp)
    450 	struct socket  *so;
    451 	struct ddpcb   *ddp;
    452 {
    453 	soisdisconnected(so);
    454 	so->so_pcb = 0;
    455 	sofree(so);
    456 
    457 	/* remove ddp from ddp_ports list */
    458 	if (ddp->ddp_lsat.sat_port != ATADDR_ANYPORT &&
    459 	    ddp_ports[ddp->ddp_lsat.sat_port - 1] != NULL) {
    460 		if (ddp->ddp_pprev != NULL) {
    461 			ddp->ddp_pprev->ddp_pnext = ddp->ddp_pnext;
    462 		} else {
    463 			ddp_ports[ddp->ddp_lsat.sat_port - 1] = ddp->ddp_pnext;
    464 		}
    465 		if (ddp->ddp_pnext != NULL) {
    466 			ddp->ddp_pnext->ddp_pprev = ddp->ddp_pprev;
    467 		}
    468 	}
    469 	if (ddp->ddp_route.ro_rt) {
    470 		rtfree(ddp->ddp_route.ro_rt);
    471 	}
    472 	if (ddp->ddp_prev) {
    473 		ddp->ddp_prev->ddp_next = ddp->ddp_next;
    474 	} else {
    475 		ddpcb = ddp->ddp_next;
    476 	}
    477 	if (ddp->ddp_next) {
    478 		ddp->ddp_next->ddp_prev = ddp->ddp_prev;
    479 	}
    480 	free(ddp, M_PCB);
    481 }
    482 
    483 /*
    484  * For the moment, this just find the pcb with the correct local address.
    485  * In the future, this will actually do some real searching, so we can use
    486  * the sender's address to do de-multiplexing on a single port to many
    487  * sockets (pcbs).
    488  */
    489 struct ddpcb   *
    490 ddp_search(from, to, aa)
    491 	struct sockaddr_at *from;
    492 	struct sockaddr_at *to;
    493 	struct at_ifaddr *aa;
    494 {
    495 	struct ddpcb   *ddp;
    496 
    497 	/*
    498          * Check for bad ports.
    499          */
    500 	if (to->sat_port < ATPORT_FIRST || to->sat_port >= ATPORT_LAST) {
    501 		return (NULL);
    502 	}
    503 	/*
    504          * Make sure the local address matches the sent address.  What about
    505          * the interface?
    506          */
    507 	for (ddp = ddp_ports[to->sat_port - 1]; ddp; ddp = ddp->ddp_pnext) {
    508 		/* XXX should we handle 0.YY? */
    509 
    510 		/* XXXX.YY to socket on destination interface */
    511 		if (to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net &&
    512 		    to->sat_addr.s_node == ddp->ddp_lsat.sat_addr.s_node) {
    513 			break;
    514 		}
    515 		/* 0.255 to socket on receiving interface */
    516 		if (to->sat_addr.s_node == ATADDR_BCAST &&
    517 		    (to->sat_addr.s_net == 0 ||
    518 		    to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net) &&
    519 		ddp->ddp_lsat.sat_addr.s_net == AA_SAT(aa)->sat_addr.s_net) {
    520 			break;
    521 		}
    522 		/* XXXX.0 to socket on destination interface */
    523 		if (to->sat_addr.s_net == aa->aa_firstnet &&
    524 		    to->sat_addr.s_node == 0 &&
    525 		    ntohs(ddp->ddp_lsat.sat_addr.s_net) >=
    526 		    ntohs(aa->aa_firstnet) &&
    527 		    ntohs(ddp->ddp_lsat.sat_addr.s_net) <=
    528 		    ntohs(aa->aa_lastnet)) {
    529 			break;
    530 		}
    531 	}
    532 	return (ddp);
    533 }
    534 
    535 /*
    536  * Initialize all the ddp & appletalk stuff
    537  */
    538 void
    539 ddp_init()
    540 {
    541 	TAILQ_INIT(&at_ifaddr);
    542 	atintrq1.ifq_maxlen = IFQ_MAXLEN;
    543 	atintrq2.ifq_maxlen = IFQ_MAXLEN;
    544 }
    545 
    546 #if 0
    547 static void
    548 ddp_clean()
    549 {
    550 	struct ddpcb   *ddp;
    551 
    552 	for (ddp = ddpcb; ddp; ddp = ddp->ddp_next)
    553 		at_pcbdetach(ddp->ddp_socket, ddp);
    554 }
    555 #endif
    556