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ddp_usrreq.c revision 1.40.18.2 
      1 /*	$NetBSD: ddp_usrreq.c,v 1.40.18.2 2014/05/18 17:46:13 rmind 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 1.40.18.2 2014/05/18 17:46:13 rmind 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/mbuf.h>
     38 #include <sys/ioctl.h>
     39 #include <sys/queue.h>
     40 #include <sys/socket.h>
     41 #include <sys/socketvar.h>
     42 #include <sys/protosw.h>
     43 #include <sys/kauth.h>
     44 #include <sys/kmem.h>
     45 #include <sys/sysctl.h>
     46 #include <net/if.h>
     47 #include <net/route.h>
     48 #include <net/if_ether.h>
     49 #include <net/net_stats.h>
     50 #include <netinet/in.h>
     51 
     52 #include <netatalk/at.h>
     53 #include <netatalk/at_var.h>
     54 #include <netatalk/ddp_var.h>
     55 #include <netatalk/ddp_private.h>
     56 #include <netatalk/aarp.h>
     57 #include <netatalk/at_extern.h>
     58 
     59 static void at_pcbdisconnect(struct ddpcb *);
     60 static void at_sockaddr(struct ddpcb *, struct mbuf *);
     61 static int at_pcbsetaddr(struct ddpcb *, struct mbuf *, struct lwp *);
     62 static int at_pcbconnect(struct ddpcb *, struct mbuf *, struct lwp *);
     63 static void ddp_detach(struct socket *);
     64 
     65 struct ifqueue atintrq1, atintrq2;
     66 struct ddpcb   *ddp_ports[ATPORT_LAST];
     67 struct ddpcb   *ddpcb = NULL;
     68 percpu_t *ddpstat_percpu;
     69 struct at_ifaddrhead at_ifaddr;		/* Here as inited in this file */
     70 u_long ddp_sendspace = DDP_MAXSZ;	/* Max ddp size + 1 (ddp_type) */
     71 u_long ddp_recvspace = 25 * (587 + sizeof(struct sockaddr_at));
     72 
     73 #ifdef MBUFTRACE
     74 struct mowner atalk_rx_mowner = MOWNER_INIT("atalk", "rx");
     75 struct mowner atalk_tx_mowner = MOWNER_INIT("atalk", "tx");
     76 #endif
     77 
     78 static int
     79 ddp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *addr,
     80     struct mbuf *rights, struct lwp *l)
     81 {
     82 	struct ddpcb   *ddp;
     83 	int             error = 0;
     84 
     85 	KASSERT(req != PRU_ATTACH);
     86 	KASSERT(req != PRU_DETACH);
     87 	ddp = sotoddpcb(so);
     88 
     89 	if (req == PRU_CONTROL) {
     90 		return (at_control((long) m, (void *) addr,
     91 		    (struct ifnet *) rights, l));
     92 	}
     93 	if (req == PRU_PURGEIF) {
     94 		mutex_enter(softnet_lock);
     95 		at_purgeif((struct ifnet *) rights);
     96 		mutex_exit(softnet_lock);
     97 		return (0);
     98 	}
     99 	if (rights && rights->m_len) {
    100 		error = EINVAL;
    101 		goto release;
    102 	}
    103 	if (ddp == NULL) {
    104 		error = EINVAL;
    105 		goto release;
    106 	}
    107 	switch (req) {
    108 	case PRU_BIND:
    109 		error = at_pcbsetaddr(ddp, addr, l);
    110 		break;
    111 
    112 	case PRU_SOCKADDR:
    113 		at_sockaddr(ddp, addr);
    114 		break;
    115 
    116 	case PRU_CONNECT:
    117 		if (ddp->ddp_fsat.sat_port != ATADDR_ANYPORT) {
    118 			error = EISCONN;
    119 			break;
    120 		}
    121 		error = at_pcbconnect(ddp, addr, l);
    122 		if (error == 0)
    123 			soisconnected(so);
    124 		break;
    125 
    126 	case PRU_DISCONNECT:
    127 		if (ddp->ddp_fsat.sat_addr.s_node == ATADDR_ANYNODE) {
    128 			error = ENOTCONN;
    129 			break;
    130 		}
    131 		at_pcbdisconnect(ddp);
    132 		soisdisconnected(so);
    133 		break;
    134 
    135 	case PRU_SHUTDOWN:
    136 		socantsendmore(so);
    137 		break;
    138 
    139 	case PRU_SEND:{
    140 			int s = 0;
    141 
    142 			if (addr) {
    143 				if (ddp->ddp_fsat.sat_port != ATADDR_ANYPORT) {
    144 					error = EISCONN;
    145 					break;
    146 				}
    147 				s = splnet();
    148 				error = at_pcbconnect(ddp, addr, l);
    149 				if (error) {
    150 					splx(s);
    151 					break;
    152 				}
    153 			} else {
    154 				if (ddp->ddp_fsat.sat_port == ATADDR_ANYPORT) {
    155 					error = ENOTCONN;
    156 					break;
    157 				}
    158 			}
    159 
    160 			error = ddp_output(m, ddp);
    161 			m = NULL;
    162 			if (addr) {
    163 				at_pcbdisconnect(ddp);
    164 				splx(s);
    165 			}
    166 		}
    167 		break;
    168 
    169 	case PRU_ABORT:
    170 		soisdisconnected(so);
    171 		ddp_detach(so);
    172 		break;
    173 
    174 	case PRU_LISTEN:
    175 	case PRU_CONNECT2:
    176 	case PRU_ACCEPT:
    177 	case PRU_SENDOOB:
    178 	case PRU_FASTTIMO:
    179 	case PRU_SLOWTIMO:
    180 	case PRU_PROTORCV:
    181 	case PRU_PROTOSEND:
    182 		error = EOPNOTSUPP;
    183 		break;
    184 
    185 	case PRU_RCVD:
    186 	case PRU_RCVOOB:
    187 		/*
    188 		 * Don't mfree. Good architecture...
    189 		 */
    190 		return (EOPNOTSUPP);
    191 
    192 	case PRU_SENSE:
    193 		/*
    194 		 * 1. Don't return block size.
    195 		 * 2. Don't mfree.
    196 		 */
    197 		return (0);
    198 
    199 	default:
    200 		error = EOPNOTSUPP;
    201 	}
    202 
    203 release:
    204 	if (m != NULL) {
    205 		m_freem(m);
    206 	}
    207 	return (error);
    208 }
    209 
    210 static void
    211 at_sockaddr(struct ddpcb *ddp, 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(struct ddpcb *ddp, struct mbuf *addr, struct lwp *l)
    222 {
    223 	struct sockaddr_at lsat, *sat;
    224 	struct at_ifaddr *aa;
    225 	struct ddpcb   *ddpp;
    226 
    227 	if (ddp->ddp_lsat.sat_port != ATADDR_ANYPORT) {	/* shouldn't be bound */
    228 		return (EINVAL);
    229 	}
    230 	if (addr != 0) {	/* validate passed address */
    231 		sat = mtod(addr, struct sockaddr_at *);
    232 		if (addr->m_len != sizeof(*sat))
    233 			return (EINVAL);
    234 
    235 		if (sat->sat_family != AF_APPLETALK)
    236 			return (EAFNOSUPPORT);
    237 
    238 		if (sat->sat_addr.s_node != ATADDR_ANYNODE ||
    239 		    sat->sat_addr.s_net != ATADDR_ANYNET) {
    240 			TAILQ_FOREACH(aa, &at_ifaddr, aa_list) {
    241 				if ((sat->sat_addr.s_net ==
    242 				    AA_SAT(aa)->sat_addr.s_net) &&
    243 				    (sat->sat_addr.s_node ==
    244 				    AA_SAT(aa)->sat_addr.s_node))
    245 					break;
    246 			}
    247 			if (!aa)
    248 				return (EADDRNOTAVAIL);
    249 		}
    250 		if (sat->sat_port != ATADDR_ANYPORT) {
    251 			int error;
    252 
    253 			if (sat->sat_port < ATPORT_FIRST ||
    254 			    sat->sat_port >= ATPORT_LAST)
    255 				return (EINVAL);
    256 
    257 			if (sat->sat_port < ATPORT_RESERVED && l &&
    258 			    (error = kauth_authorize_network(l->l_cred,
    259 			    KAUTH_NETWORK_BIND, KAUTH_REQ_NETWORK_BIND_PRIVPORT,
    260 			    ddpcb->ddp_socket, sat, NULL)) != 0)
    261 				return (error);
    262 		}
    263 	} else {
    264 		memset((void *) & lsat, 0, 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 (TAILQ_EMPTY(&at_ifaddr))
    275 			return EADDRNOTAVAIL;
    276 		sat->sat_addr = AA_SAT(TAILQ_FIRST(&at_ifaddr))->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(struct ddpcb *ddp, struct mbuf *addr, struct lwp *l)
    317 {
    318 	struct rtentry *rt;
    319 	const struct sockaddr_at *cdst;
    320 	struct sockaddr_at *sat = mtod(addr, struct sockaddr_at *);
    321 	struct route *ro;
    322 	struct at_ifaddr *aa;
    323 	struct ifnet   *ifp;
    324 	u_short         hintnet = 0, net;
    325 
    326 	if (addr->m_len != sizeof(*sat))
    327 		return EINVAL;
    328 	if (sat->sat_family != AF_APPLETALK) {
    329 		return EAFNOSUPPORT;
    330 	}
    331 	/*
    332          * Under phase 2, network 0 means "the network".  We take "the
    333          * network" to mean the network the control block is bound to.
    334          * If the control block is not bound, there is an error.
    335          */
    336 	if (sat->sat_addr.s_net == ATADDR_ANYNET
    337 	    && sat->sat_addr.s_node != ATADDR_ANYNODE) {
    338 		if (ddp->ddp_lsat.sat_port == ATADDR_ANYPORT) {
    339 			return EADDRNOTAVAIL;
    340 		}
    341 		hintnet = ddp->ddp_lsat.sat_addr.s_net;
    342 	}
    343 	ro = &ddp->ddp_route;
    344 	/*
    345          * If we've got an old route for this pcb, check that it is valid.
    346          * If we've changed our address, we may have an old "good looking"
    347          * route here.  Attempt to detect it.
    348          */
    349 	if ((rt = rtcache_validate(ro)) != NULL ||
    350 	    (rt = rtcache_update(ro, 1)) != NULL) {
    351 		if (hintnet) {
    352 			net = hintnet;
    353 		} else {
    354 			net = sat->sat_addr.s_net;
    355 		}
    356 		if ((ifp = rt->rt_ifp) != NULL) {
    357 			TAILQ_FOREACH(aa, &at_ifaddr, aa_list) {
    358 				if (aa->aa_ifp == ifp &&
    359 				    ntohs(net) >= ntohs(aa->aa_firstnet) &&
    360 				    ntohs(net) <= ntohs(aa->aa_lastnet)) {
    361 					break;
    362 				}
    363 			}
    364 		} else
    365 			aa = NULL;
    366 		cdst = satocsat(rtcache_getdst(ro));
    367 		if (aa == NULL || (cdst->sat_addr.s_net !=
    368 		    (hintnet ? hintnet : sat->sat_addr.s_net) ||
    369 		    cdst->sat_addr.s_node != sat->sat_addr.s_node)) {
    370 			rtcache_free(ro);
    371 			rt = NULL;
    372 		}
    373 	}
    374 	/*
    375          * If we've got no route for this interface, try to find one.
    376          */
    377 	if (rt == NULL) {
    378 		union {
    379 			struct sockaddr		dst;
    380 			struct sockaddr_at	dsta;
    381 		} u;
    382 
    383 		sockaddr_at_init(&u.dsta, &sat->sat_addr, 0);
    384 		if (hintnet)
    385 			u.dsta.sat_addr.s_net = hintnet;
    386 		rt = rtcache_lookup(ro, &u.dst);
    387 	}
    388 	/*
    389          * Make sure any route that we have has a valid interface.
    390          */
    391 	if (rt != NULL && (ifp = rt->rt_ifp) != NULL) {
    392 		TAILQ_FOREACH(aa, &at_ifaddr, aa_list) {
    393 			if (aa->aa_ifp == ifp)
    394 				break;
    395 		}
    396 	} else
    397 		aa = NULL;
    398 	if (aa == NULL)
    399 		return ENETUNREACH;
    400 	ddp->ddp_fsat = *sat;
    401 	if (ddp->ddp_lsat.sat_port == ATADDR_ANYPORT)
    402 		return at_pcbsetaddr(ddp, NULL, l);
    403 	return 0;
    404 }
    405 
    406 static void
    407 at_pcbdisconnect(struct ddpcb *ddp)
    408 {
    409 	ddp->ddp_fsat.sat_addr.s_net = ATADDR_ANYNET;
    410 	ddp->ddp_fsat.sat_addr.s_node = ATADDR_ANYNODE;
    411 	ddp->ddp_fsat.sat_port = ATADDR_ANYPORT;
    412 }
    413 
    414 static int
    415 ddp_attach(struct socket *so, int proto)
    416 {
    417 	struct ddpcb *ddp;
    418 	int error;
    419 
    420 	KASSERT(sotoddpcb(so) == NULL);
    421 	sosetlock(so);
    422 #ifdef MBUFTRACE
    423 	so->so_rcv.sb_mowner = &atalk_rx_mowner;
    424 	so->so_snd.sb_mowner = &atalk_tx_mowner;
    425 #endif
    426 	error = soreserve(so, ddp_sendspace, ddp_recvspace);
    427 	if (error) {
    428 		return error;
    429 	}
    430 
    431 	ddp = kmem_zalloc(sizeof(*ddp), KM_SLEEP);
    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 = ddp;
    445 	return 0;
    446 }
    447 
    448 static void
    449 ddp_detach(struct socket *so)
    450 {
    451 	struct ddpcb *ddp = sotoddpcb(so);
    452 
    453 	soisdisconnected(so);
    454 	so->so_pcb = NULL;
    455 	/* sofree drops the lock */
    456 	sofree(so);
    457 	mutex_enter(softnet_lock);
    458 
    459 	/* remove ddp from ddp_ports list */
    460 	if (ddp->ddp_lsat.sat_port != ATADDR_ANYPORT &&
    461 	    ddp_ports[ddp->ddp_lsat.sat_port - 1] != NULL) {
    462 		if (ddp->ddp_pprev != NULL) {
    463 			ddp->ddp_pprev->ddp_pnext = ddp->ddp_pnext;
    464 		} else {
    465 			ddp_ports[ddp->ddp_lsat.sat_port - 1] = ddp->ddp_pnext;
    466 		}
    467 		if (ddp->ddp_pnext != NULL) {
    468 			ddp->ddp_pnext->ddp_pprev = ddp->ddp_pprev;
    469 		}
    470 	}
    471 	rtcache_free(&ddp->ddp_route);
    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 	kmem_free(ddp, sizeof(*ddp));
    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(
    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(void)
    540 {
    541 
    542 	ddpstat_percpu = percpu_alloc(sizeof(uint64_t) * DDP_NSTATS);
    543 
    544 	TAILQ_INIT(&at_ifaddr);
    545 	atintrq1.ifq_maxlen = IFQ_MAXLEN;
    546 	atintrq2.ifq_maxlen = IFQ_MAXLEN;
    547 
    548 	MOWNER_ATTACH(&atalk_tx_mowner);
    549 	MOWNER_ATTACH(&atalk_rx_mowner);
    550 	MOWNER_ATTACH(&aarp_mowner);
    551 }
    552 
    553 PR_WRAP_USRREQ(ddp_usrreq)
    554 
    555 #define	ddp_usrreq	ddp_usrreq_wrapper
    556 
    557 const struct pr_usrreqs ddp_usrreqs = {
    558 	.pr_attach	= ddp_attach,
    559 	.pr_detach	= ddp_detach,
    560 	.pr_generic	= ddp_usrreq,
    561 };
    562 
    563 static int
    564 sysctl_net_atalk_ddp_stats(SYSCTLFN_ARGS)
    565 {
    566 
    567 	return (NETSTAT_SYSCTL(ddpstat_percpu, DDP_NSTATS));
    568 }
    569 
    570 /*
    571  * Sysctl for DDP variables.
    572  */
    573 SYSCTL_SETUP(sysctl_net_atalk_ddp_setup, "sysctl net.atalk.ddp subtree setup")
    574 {
    575 
    576 	sysctl_createv(clog, 0, NULL, NULL,
    577 		       CTLFLAG_PERMANENT,
    578 		       CTLTYPE_NODE, "atalk", NULL,
    579 		       NULL, 0, NULL, 0,
    580 		       CTL_NET, PF_APPLETALK, CTL_EOL);
    581 	sysctl_createv(clog, 0, NULL, NULL,
    582 		       CTLFLAG_PERMANENT,
    583 		       CTLTYPE_NODE, "ddp",
    584 		       SYSCTL_DESCR("DDP related settings"),
    585 		       NULL, 0, NULL, 0,
    586 		       CTL_NET, PF_APPLETALK, ATPROTO_DDP, CTL_EOL);
    587 
    588 	sysctl_createv(clog, 0, NULL, NULL,
    589 		       CTLFLAG_PERMANENT,
    590 		       CTLTYPE_STRUCT, "stats",
    591 		       SYSCTL_DESCR("DDP statistics"),
    592 		       sysctl_net_atalk_ddp_stats, 0, NULL, 0,
    593 		       CTL_NET, PF_APPLETALK, ATPROTO_DDP, CTL_CREATE,
    594 		       CTL_EOL);
    595 }
    596