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ddp_usrreq.c revision 1.11 
      1 /*	$NetBSD: ddp_usrreq.c,v 1.11 2003/06/29 22:31:54 fvdl 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 1.11 2003/06/29 22:31:54 fvdl 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_WAIT);
    444 	if (!ddp)
    445 		panic("at_pcballoc");
    446 	bzero((caddr_t) ddp, sizeof *ddp);
    447 	ddp->ddp_lsat.sat_port = ATADDR_ANYPORT;
    448 
    449 	ddp->ddp_next = ddpcb;
    450 	ddp->ddp_prev = NULL;
    451 	ddp->ddp_pprev = NULL;
    452 	ddp->ddp_pnext = NULL;
    453 	if (ddpcb) {
    454 		ddpcb->ddp_prev = ddp;
    455 	}
    456 	ddpcb = ddp;
    457 
    458 	ddp->ddp_socket = so;
    459 	so->so_pcb = (caddr_t) ddp;
    460 #ifdef MBUFTRACE
    461 	so->so_rcv.sb_mowner = &atalk_rx_mowner;
    462 	so->so_snd.sb_mowner = &atalk_tx_mowner;
    463 #endif
    464 	return (0);
    465 }
    466 
    467 static void
    468 at_pcbdetach(so, ddp)
    469 	struct socket  *so;
    470 	struct ddpcb   *ddp;
    471 {
    472 	soisdisconnected(so);
    473 	so->so_pcb = 0;
    474 	sofree(so);
    475 
    476 	/* remove ddp from ddp_ports list */
    477 	if (ddp->ddp_lsat.sat_port != ATADDR_ANYPORT &&
    478 	    ddp_ports[ddp->ddp_lsat.sat_port - 1] != NULL) {
    479 		if (ddp->ddp_pprev != NULL) {
    480 			ddp->ddp_pprev->ddp_pnext = ddp->ddp_pnext;
    481 		} else {
    482 			ddp_ports[ddp->ddp_lsat.sat_port - 1] = ddp->ddp_pnext;
    483 		}
    484 		if (ddp->ddp_pnext != NULL) {
    485 			ddp->ddp_pnext->ddp_pprev = ddp->ddp_pprev;
    486 		}
    487 	}
    488 	if (ddp->ddp_route.ro_rt) {
    489 		rtfree(ddp->ddp_route.ro_rt);
    490 	}
    491 	if (ddp->ddp_prev) {
    492 		ddp->ddp_prev->ddp_next = ddp->ddp_next;
    493 	} else {
    494 		ddpcb = ddp->ddp_next;
    495 	}
    496 	if (ddp->ddp_next) {
    497 		ddp->ddp_next->ddp_prev = ddp->ddp_prev;
    498 	}
    499 	free(ddp, M_PCB);
    500 }
    501 
    502 /*
    503  * For the moment, this just find the pcb with the correct local address.
    504  * In the future, this will actually do some real searching, so we can use
    505  * the sender's address to do de-multiplexing on a single port to many
    506  * sockets (pcbs).
    507  */
    508 struct ddpcb   *
    509 ddp_search(from, to, aa)
    510 	struct sockaddr_at *from;
    511 	struct sockaddr_at *to;
    512 	struct at_ifaddr *aa;
    513 {
    514 	struct ddpcb   *ddp;
    515 
    516 	/*
    517          * Check for bad ports.
    518          */
    519 	if (to->sat_port < ATPORT_FIRST || to->sat_port >= ATPORT_LAST) {
    520 		return (NULL);
    521 	}
    522 	/*
    523          * Make sure the local address matches the sent address.  What about
    524          * the interface?
    525          */
    526 	for (ddp = ddp_ports[to->sat_port - 1]; ddp; ddp = ddp->ddp_pnext) {
    527 		/* XXX should we handle 0.YY? */
    528 
    529 		/* XXXX.YY to socket on destination interface */
    530 		if (to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net &&
    531 		    to->sat_addr.s_node == ddp->ddp_lsat.sat_addr.s_node) {
    532 			break;
    533 		}
    534 		/* 0.255 to socket on receiving interface */
    535 		if (to->sat_addr.s_node == ATADDR_BCAST &&
    536 		    (to->sat_addr.s_net == 0 ||
    537 		    to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net) &&
    538 		ddp->ddp_lsat.sat_addr.s_net == AA_SAT(aa)->sat_addr.s_net) {
    539 			break;
    540 		}
    541 		/* XXXX.0 to socket on destination interface */
    542 		if (to->sat_addr.s_net == aa->aa_firstnet &&
    543 		    to->sat_addr.s_node == 0 &&
    544 		    ntohs(ddp->ddp_lsat.sat_addr.s_net) >=
    545 		    ntohs(aa->aa_firstnet) &&
    546 		    ntohs(ddp->ddp_lsat.sat_addr.s_net) <=
    547 		    ntohs(aa->aa_lastnet)) {
    548 			break;
    549 		}
    550 	}
    551 	return (ddp);
    552 }
    553 
    554 /*
    555  * Initialize all the ddp & appletalk stuff
    556  */
    557 void
    558 ddp_init()
    559 {
    560 	TAILQ_INIT(&at_ifaddr);
    561 	atintrq1.ifq_maxlen = IFQ_MAXLEN;
    562 	atintrq2.ifq_maxlen = IFQ_MAXLEN;
    563 
    564 	MOWNER_ATTACH(&atalk_tx_mowner);
    565 	MOWNER_ATTACH(&atalk_rx_mowner);
    566 }
    567 
    568 #if 0
    569 static void
    570 ddp_clean()
    571 {
    572 	struct ddpcb   *ddp;
    573 
    574 	for (ddp = ddpcb; ddp; ddp = ddp->ddp_next)
    575 		at_pcbdetach(ddp->ddp_socket, ddp);
    576 }
    577 #endif
    578