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ddp_usrreq.c revision 1.23 
      1 /*	$NetBSD: ddp_usrreq.c,v 1.23 2007/02/17 22:34:10 dyoung 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 1.23 2007/02/17 22:34:10 dyoung 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 <sys/kauth.h>
     44 #include <net/if.h>
     45 #include <net/route.h>
     46 #include <net/if_ether.h>
     47 #include <netinet/in.h>
     48 
     49 #include <netatalk/at.h>
     50 #include <netatalk/at_var.h>
     51 #include <netatalk/ddp_var.h>
     52 #include <netatalk/aarp.h>
     53 #include <netatalk/at_extern.h>
     54 
     55 static void at_pcbdisconnect __P((struct ddpcb *));
     56 static void at_sockaddr __P((struct ddpcb *, struct mbuf *));
     57 static int at_pcbsetaddr __P((struct ddpcb *, struct mbuf *, struct lwp *));
     58 static int at_pcbconnect __P((struct ddpcb *, struct mbuf *, struct lwp *));
     59 static void at_pcbdetach __P((struct socket *, struct ddpcb *));
     60 static int at_pcballoc __P((struct socket *));
     61 
     62 struct ifqueue atintrq1, atintrq2;
     63 struct ddpcb   *ddp_ports[ATPORT_LAST];
     64 struct ddpcb   *ddpcb = NULL;
     65 struct ddpstat	ddpstat;
     66 struct at_ifaddrhead at_ifaddr;		/* Here as inited in this file */
     67 u_long ddp_sendspace = DDP_MAXSZ;	/* Max ddp size + 1 (ddp_type) */
     68 u_long ddp_recvspace = 25 * (587 + sizeof(struct sockaddr_at));
     69 
     70 #ifdef MBUFTRACE
     71 struct mowner atalk_rx_mowner = MOWNER_INIT("atalk", "rx");
     72 struct mowner atalk_tx_mowner = MOWNER_INIT("atalk", "tx");
     73 #endif
     74 
     75 /* ARGSUSED */
     76 int
     77 ddp_usrreq(so, req, m, addr, rights, l)
     78 	struct socket  *so;
     79 	int             req;
     80 	struct mbuf    *m;
     81 	struct mbuf    *addr;
     82 	struct mbuf    *rights;
     83 	struct lwp *l;
     84 {
     85 	struct ddpcb   *ddp;
     86 	int             error = 0;
     87 
     88 	ddp = sotoddpcb(so);
     89 
     90 	if (req == PRU_CONTROL) {
     91 		return (at_control((long) m, (caddr_t) addr,
     92 		    (struct ifnet *) rights, l));
     93 	}
     94 	if (req == PRU_PURGEIF) {
     95 		at_purgeif((struct ifnet *) rights);
     96 		return (0);
     97 	}
     98 	if (rights && rights->m_len) {
     99 		error = EINVAL;
    100 		goto release;
    101 	}
    102 	if (ddp == NULL && req != PRU_ATTACH) {
    103 		error = EINVAL;
    104 		goto release;
    105 	}
    106 	switch (req) {
    107 	case PRU_ATTACH:
    108 		if (ddp != NULL) {
    109 			error = EINVAL;
    110 			break;
    111 		}
    112 		if ((error = at_pcballoc(so)) != 0) {
    113 			break;
    114 		}
    115 		error = soreserve(so, ddp_sendspace, ddp_recvspace);
    116 		break;
    117 
    118 	case PRU_DETACH:
    119 		at_pcbdetach(so, ddp);
    120 		break;
    121 
    122 	case PRU_BIND:
    123 		error = at_pcbsetaddr(ddp, addr, l);
    124 		break;
    125 
    126 	case PRU_SOCKADDR:
    127 		at_sockaddr(ddp, addr);
    128 		break;
    129 
    130 	case PRU_CONNECT:
    131 		if (ddp->ddp_fsat.sat_port != ATADDR_ANYPORT) {
    132 			error = EISCONN;
    133 			break;
    134 		}
    135 		error = at_pcbconnect(ddp, addr, l);
    136 		if (error == 0)
    137 			soisconnected(so);
    138 		break;
    139 
    140 	case PRU_DISCONNECT:
    141 		if (ddp->ddp_fsat.sat_addr.s_node == ATADDR_ANYNODE) {
    142 			error = ENOTCONN;
    143 			break;
    144 		}
    145 		at_pcbdisconnect(ddp);
    146 		soisdisconnected(so);
    147 		break;
    148 
    149 	case PRU_SHUTDOWN:
    150 		socantsendmore(so);
    151 		break;
    152 
    153 	case PRU_SEND:{
    154 			int s = 0;
    155 
    156 			if (addr) {
    157 				if (ddp->ddp_fsat.sat_port != ATADDR_ANYPORT) {
    158 					error = EISCONN;
    159 					break;
    160 				}
    161 				s = splnet();
    162 				error = at_pcbconnect(ddp, addr, l);
    163 				if (error) {
    164 					splx(s);
    165 					break;
    166 				}
    167 			} else {
    168 				if (ddp->ddp_fsat.sat_port == ATADDR_ANYPORT) {
    169 					error = ENOTCONN;
    170 					break;
    171 				}
    172 			}
    173 
    174 			error = ddp_output(m, ddp);
    175 			m = NULL;
    176 			if (addr) {
    177 				at_pcbdisconnect(ddp);
    178 				splx(s);
    179 			}
    180 		}
    181 		break;
    182 
    183 	case PRU_ABORT:
    184 		soisdisconnected(so);
    185 		at_pcbdetach(so, ddp);
    186 		break;
    187 
    188 	case PRU_LISTEN:
    189 	case PRU_CONNECT2:
    190 	case PRU_ACCEPT:
    191 	case PRU_SENDOOB:
    192 	case PRU_FASTTIMO:
    193 	case PRU_SLOWTIMO:
    194 	case PRU_PROTORCV:
    195 	case PRU_PROTOSEND:
    196 		error = EOPNOTSUPP;
    197 		break;
    198 
    199 	case PRU_RCVD:
    200 	case PRU_RCVOOB:
    201 		/*
    202 		 * Don't mfree. Good architecture...
    203 		 */
    204 		return (EOPNOTSUPP);
    205 
    206 	case PRU_SENSE:
    207 		/*
    208 		 * 1. Don't return block size.
    209 		 * 2. Don't mfree.
    210 		 */
    211 		return (0);
    212 
    213 	default:
    214 		error = EOPNOTSUPP;
    215 	}
    216 
    217 release:
    218 	if (m != NULL) {
    219 		m_freem(m);
    220 	}
    221 	return (error);
    222 }
    223 
    224 static void
    225 at_sockaddr(ddp, addr)
    226 	struct ddpcb   *ddp;
    227 	struct mbuf    *addr;
    228 {
    229 	struct sockaddr_at *sat;
    230 
    231 	addr->m_len = sizeof(struct sockaddr_at);
    232 	sat = mtod(addr, struct sockaddr_at *);
    233 	*sat = ddp->ddp_lsat;
    234 }
    235 
    236 static int
    237 at_pcbsetaddr(ddp, addr, l)
    238 	struct ddpcb   *ddp;
    239 	struct mbuf    *addr;
    240 	struct lwp	*l;
    241 {
    242 	struct sockaddr_at lsat, *sat;
    243 	struct at_ifaddr *aa;
    244 	struct ddpcb   *ddpp;
    245 
    246 	if (ddp->ddp_lsat.sat_port != ATADDR_ANYPORT) {	/* shouldn't be bound */
    247 		return (EINVAL);
    248 	}
    249 	if (addr != 0) {	/* validate passed address */
    250 		sat = mtod(addr, struct sockaddr_at *);
    251 		if (addr->m_len != sizeof(*sat))
    252 			return (EINVAL);
    253 
    254 		if (sat->sat_family != AF_APPLETALK)
    255 			return (EAFNOSUPPORT);
    256 
    257 		if (sat->sat_addr.s_node != ATADDR_ANYNODE ||
    258 		    sat->sat_addr.s_net != ATADDR_ANYNET) {
    259 			for (aa = at_ifaddr.tqh_first; aa;
    260 			    aa = aa->aa_list.tqe_next) {
    261 				if ((sat->sat_addr.s_net ==
    262 				    AA_SAT(aa)->sat_addr.s_net) &&
    263 				    (sat->sat_addr.s_node ==
    264 				    AA_SAT(aa)->sat_addr.s_node))
    265 					break;
    266 			}
    267 			if (!aa)
    268 				return (EADDRNOTAVAIL);
    269 		}
    270 		if (sat->sat_port != ATADDR_ANYPORT) {
    271 			if (sat->sat_port < ATPORT_FIRST ||
    272 			    sat->sat_port >= ATPORT_LAST)
    273 				return (EINVAL);
    274 
    275 			if (sat->sat_port < ATPORT_RESERVED && l &&
    276 			    kauth_authorize_generic(l->l_cred,
    277 			    KAUTH_GENERIC_ISSUSER, NULL))
    278 				return (EACCES);
    279 		}
    280 	} else {
    281 		bzero((caddr_t) & lsat, sizeof(struct sockaddr_at));
    282 		lsat.sat_len = sizeof(struct sockaddr_at);
    283 		lsat.sat_addr.s_node = ATADDR_ANYNODE;
    284 		lsat.sat_addr.s_net = ATADDR_ANYNET;
    285 		lsat.sat_family = AF_APPLETALK;
    286 		sat = &lsat;
    287 	}
    288 
    289 	if (sat->sat_addr.s_node == ATADDR_ANYNODE &&
    290 	    sat->sat_addr.s_net == ATADDR_ANYNET) {
    291 		if (at_ifaddr.tqh_first == NULL)
    292 			return (EADDRNOTAVAIL);
    293 		sat->sat_addr = AA_SAT(at_ifaddr.tqh_first)->sat_addr;
    294 	}
    295 	ddp->ddp_lsat = *sat;
    296 
    297 	/*
    298          * Choose port.
    299          */
    300 	if (sat->sat_port == ATADDR_ANYPORT) {
    301 		for (sat->sat_port = ATPORT_RESERVED;
    302 		     sat->sat_port < ATPORT_LAST; sat->sat_port++) {
    303 			if (ddp_ports[sat->sat_port - 1] == 0)
    304 				break;
    305 		}
    306 		if (sat->sat_port == ATPORT_LAST) {
    307 			return (EADDRNOTAVAIL);
    308 		}
    309 		ddp->ddp_lsat.sat_port = sat->sat_port;
    310 		ddp_ports[sat->sat_port - 1] = ddp;
    311 	} else {
    312 		for (ddpp = ddp_ports[sat->sat_port - 1]; ddpp;
    313 		     ddpp = ddpp->ddp_pnext) {
    314 			if (ddpp->ddp_lsat.sat_addr.s_net ==
    315 			    sat->sat_addr.s_net &&
    316 			    ddpp->ddp_lsat.sat_addr.s_node ==
    317 			    sat->sat_addr.s_node)
    318 				break;
    319 		}
    320 		if (ddpp != NULL)
    321 			return (EADDRINUSE);
    322 
    323 		ddp->ddp_pnext = ddp_ports[sat->sat_port - 1];
    324 		ddp_ports[sat->sat_port - 1] = ddp;
    325 		if (ddp->ddp_pnext)
    326 			ddp->ddp_pnext->ddp_pprev = ddp;
    327 	}
    328 
    329 	return 0;
    330 }
    331 
    332 static int
    333 at_pcbconnect(ddp, addr, l)
    334 	struct ddpcb   *ddp;
    335 	struct mbuf    *addr;
    336 	struct lwp     *l;
    337 {
    338 	struct sockaddr_at *sat = mtod(addr, struct sockaddr_at *);
    339 	struct route *ro;
    340 	struct at_ifaddr *aa = 0;
    341 	struct ifnet   *ifp;
    342 	u_short         hintnet = 0, net;
    343 
    344 	if (addr->m_len != sizeof(*sat))
    345 		return (EINVAL);
    346 	if (sat->sat_family != AF_APPLETALK) {
    347 		return (EAFNOSUPPORT);
    348 	}
    349 	/*
    350          * Under phase 2, network 0 means "the network".  We take "the
    351          * network" to mean the network the control block is bound to.
    352          * If the control block is not bound, there is an error.
    353          */
    354 	if (sat->sat_addr.s_net == ATADDR_ANYNET
    355 	    && sat->sat_addr.s_node != ATADDR_ANYNODE) {
    356 		if (ddp->ddp_lsat.sat_port == ATADDR_ANYPORT) {
    357 			return (EADDRNOTAVAIL);
    358 		}
    359 		hintnet = ddp->ddp_lsat.sat_addr.s_net;
    360 	}
    361 	ro = &ddp->ddp_route;
    362 	/*
    363          * If we've got an old route for this pcb, check that it is valid.
    364          * If we've changed our address, we may have an old "good looking"
    365          * route here.  Attempt to detect it.
    366          */
    367 	rtcache_check(ro);
    368 	if (ro->ro_rt != NULL) {
    369 		if (hintnet) {
    370 			net = hintnet;
    371 		} else {
    372 			net = sat->sat_addr.s_net;
    373 		}
    374 		aa = 0;
    375 		if ((ifp = ro->ro_rt->rt_ifp) != NULL) {
    376 			for (aa = at_ifaddr.tqh_first; aa;
    377 			    aa = aa->aa_list.tqe_next) {
    378 				if (aa->aa_ifp == ifp &&
    379 				    ntohs(net) >= ntohs(aa->aa_firstnet) &&
    380 				    ntohs(net) <= ntohs(aa->aa_lastnet)) {
    381 					break;
    382 				}
    383 			}
    384 		}
    385 		if (aa == NULL || (satocsat(rtcache_getdst(ro))->sat_addr.s_net !=
    386 		    (hintnet ? hintnet : sat->sat_addr.s_net) ||
    387 		    satocsat(rtcache_getdst(ro))->sat_addr.s_node !=
    388 		    sat->sat_addr.s_node))
    389 			rtcache_free(ro);
    390 	}
    391 	/*
    392          * If we've got no route for this interface, try to find one.
    393          */
    394 	if (ro->ro_rt == NULL) {
    395 		memset(&ro->ro_dst, 0, 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 		rtcache_init(ro);
    406 	}
    407 	/*
    408          * Make sure any route that we have has a valid interface.
    409          */
    410 	aa = 0;
    411 	if (ro->ro_rt != NULL && (ifp = ro->ro_rt->rt_ifp) != NULL) {
    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, l));
    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(
    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